drivers/net/wireless/brcm80211/brcmfmac/dhd_sdio.c

   1 /*
   2  * Copyright (c) 2010 Broadcom Corporation
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  11  * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
  13  * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
  14  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  18
  19 #include <linux/types.h>
  20 #include <linux/kernel.h>
  21 #include <linux/kthread.h>
  22 #include <linux/printk.h>
  23 #include <linux/pci_ids.h>
  24 #include <linux/netdevice.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/sched.h>
  27 #include <linux/mmc/sdio.h>
  28 #include <linux/mmc/sdio_func.h>
  29 #include <linux/mmc/card.h>
  30 #include <linux/semaphore.h>
  31 #include <linux/firmware.h>
  32 #include <linux/module.h>
  33 #include <linux/bcma/bcma.h>
  34 #include <linux/debugfs.h>
  35 #include <linux/vmalloc.h>
  36 #include <asm/unaligned.h>
  37 #include <defs.h>
  38 #include <brcmu_wifi.h>
  39 #include <brcmu_utils.h>
  40 #include <brcm_hw_ids.h>
  41 #include <soc.h>
  42 #include "sdio_host.h"
  43 #include "sdio_chip.h"
  44
  45 #define DCMD_RESP_TIMEOUT  2000 /* In milli second */
  46
  47 #ifdef DEBUG
  48
  49 #define BRCMF_TRAP_INFO_SIZE    80
  50
  51 #define CBUF_LEN        (128)
  52
  53 /* Device console log buffer state */
  54 #define CONSOLE_BUFFER_MAX      2024
  55
  56 struct rte_log_le {
  57         __le32 buf;             /* Can't be pointer on (64-bit) hosts */
  58         __le32 buf_size;
  59         __le32 idx;
  60         char *_buf_compat;      /* Redundant pointer for backward compat. */
  61 };
  62
  63 struct rte_console {
  64         /* Virtual UART
  65          * When there is no UART (e.g. Quickturn),
  66          * the host should write a complete
  67          * input line directly into cbuf and then write
  68          * the length into vcons_in.
  69          * This may also be used when there is a real UART
  70          * (at risk of conflicting with
  71          * the real UART).  vcons_out is currently unused.
  72          */
  73         uint vcons_in;
  74         uint vcons_out;
  75
  76         /* Output (logging) buffer
  77          * Console output is written to a ring buffer log_buf at index log_idx.
  78          * The host may read the output when it sees log_idx advance.
  79          * Output will be lost if the output wraps around faster than the host
  80          * polls.
  81          */
  82         struct rte_log_le log_le;
  83
  84         /* Console input line buffer
  85          * Characters are read one at a time into cbuf
  86          * until <CR> is received, then
  87          * the buffer is processed as a command line.
  88          * Also used for virtual UART.
  89          */
  90         uint cbuf_idx;
  91         char cbuf[CBUF_LEN];
  92 };
  93
  94 #endif                          /* DEBUG */
  95 #include <chipcommon.h>
  96
  97 #include "dhd_bus.h"
  98 #include "dhd_dbg.h"
  99
 100 #define TXQLEN          2048    /* bulk tx queue length */
 101 #define TXHI            (TXQLEN - 256)  /* turn on flow control above TXHI */
 102 #define TXLOW           (TXHI - 256)    /* turn off flow control below TXLOW */
 103 #define PRIOMASK        7
 104
 105 #define TXRETRIES       2       /* # of retries for tx frames */
 106
 107 #define BRCMF_RXBOUND   50      /* Default for max rx frames in
 108                                  one scheduling */
 109
 110 #define BRCMF_TXBOUND   20      /* Default for max tx frames in
 111                                  one scheduling */
 112
 113 #define BRCMF_TXMINMAX  1       /* Max tx frames if rx still pending */
 114
 115 #define MEMBLOCK        2048    /* Block size used for downloading
 116                                  of dongle image */
 117 #define MAX_DATA_BUF    (32 * 1024)     /* Must be large enough to hold
 118                                  biggest possible glom */
 119
 120 #define BRCMF_FIRSTREAD (1 << 6)
 121
 122
 123 /* SBSDIO_DEVICE_CTL */
 124
 125 /* 1: device will assert busy signal when receiving CMD53 */
 126 #define SBSDIO_DEVCTL_SETBUSY           0x01
 127 /* 1: assertion of sdio interrupt is synchronous to the sdio clock */
 128 #define SBSDIO_DEVCTL_SPI_INTR_SYNC     0x02
 129 /* 1: mask all interrupts to host except the chipActive (rev 8) */
 130 #define SBSDIO_DEVCTL_CA_INT_ONLY       0x04
 131 /* 1: isolate internal sdio signals, put external pads in tri-state; requires
 132  * sdio bus power cycle to clear (rev 9) */
 133 #define SBSDIO_DEVCTL_PADS_ISO          0x08
 134 /* Force SD->SB reset mapping (rev 11) */
 135 #define SBSDIO_DEVCTL_SB_RST_CTL        0x30
 136 /*   Determined by CoreControl bit */
 137 #define SBSDIO_DEVCTL_RST_CORECTL       0x00
 138 /*   Force backplane reset */
 139 #define SBSDIO_DEVCTL_RST_BPRESET       0x10
 140 /*   Force no backplane reset */
 141 #define SBSDIO_DEVCTL_RST_NOBPRESET     0x20
 142
 143 /* direct(mapped) cis space */
 144
 145 /* MAPPED common CIS address */
 146 #define SBSDIO_CIS_BASE_COMMON          0x1000
 147 /* maximum bytes in one CIS */
 148 #define SBSDIO_CIS_SIZE_LIMIT           0x200
 149 /* cis offset addr is < 17 bits */
 150 #define SBSDIO_CIS_OFT_ADDR_MASK        0x1FFFF
 151
 152 /* manfid tuple length, include tuple, link bytes */
 153 #define SBSDIO_CIS_MANFID_TUPLE_LEN     6
 154
 155 /* intstatus */
 156 #define I_SMB_SW0       (1 << 0)        /* To SB Mail S/W interrupt 0 */
 157 #define I_SMB_SW1       (1 << 1)        /* To SB Mail S/W interrupt 1 */
 158 #define I_SMB_SW2       (1 << 2)        /* To SB Mail S/W interrupt 2 */
 159 #define I_SMB_SW3       (1 << 3)        /* To SB Mail S/W interrupt 3 */
 160 #define I_SMB_SW_MASK   0x0000000f      /* To SB Mail S/W interrupts mask */
 161 #define I_SMB_SW_SHIFT  0       /* To SB Mail S/W interrupts shift */
 162 #define I_HMB_SW0       (1 << 4)        /* To Host Mail S/W interrupt 0 */
 163 #define I_HMB_SW1       (1 << 5)        /* To Host Mail S/W interrupt 1 */
 164 #define I_HMB_SW2       (1 << 6)        /* To Host Mail S/W interrupt 2 */
 165 #define I_HMB_SW3       (1 << 7)        /* To Host Mail S/W interrupt 3 */
 166 #define I_HMB_SW_MASK   0x000000f0      /* To Host Mail S/W interrupts mask */
 167 #define I_HMB_SW_SHIFT  4       /* To Host Mail S/W interrupts shift */
 168 #define I_WR_OOSYNC     (1 << 8)        /* Write Frame Out Of Sync */
 169 #define I_RD_OOSYNC     (1 << 9)        /* Read Frame Out Of Sync */
 170 #define I_PC            (1 << 10)       /* descriptor error */
 171 #define I_PD            (1 << 11)       /* data error */
 172 #define I_DE            (1 << 12)       /* Descriptor protocol Error */
 173 #define I_RU            (1 << 13)       /* Receive descriptor Underflow */
 174 #define I_RO            (1 << 14)       /* Receive fifo Overflow */
 175 #define I_XU            (1 << 15)       /* Transmit fifo Underflow */
 176 #define I_RI            (1 << 16)       /* Receive Interrupt */
 177 #define I_BUSPWR        (1 << 17)       /* SDIO Bus Power Change (rev 9) */
 178 #define I_XMTDATA_AVAIL (1 << 23)       /* bits in fifo */
 179 #define I_XI            (1 << 24)       /* Transmit Interrupt */
 180 #define I_RF_TERM       (1 << 25)       /* Read Frame Terminate */
 181 #define I_WF_TERM       (1 << 26)       /* Write Frame Terminate */
 182 #define I_PCMCIA_XU     (1 << 27)       /* PCMCIA Transmit FIFO Underflow */
 183 #define I_SBINT         (1 << 28)       /* sbintstatus Interrupt */
 184 #define I_CHIPACTIVE    (1 << 29)       /* chip from doze to active state */
 185 #define I_SRESET        (1 << 30)       /* CCCR RES interrupt */
 186 #define I_IOE2          (1U << 31)      /* CCCR IOE2 Bit Changed */
 187 #define I_ERRORS        (I_PC | I_PD | I_DE | I_RU | I_RO | I_XU)
 188 #define I_DMA           (I_RI | I_XI | I_ERRORS)
 189
 190 /* corecontrol */
 191 #define CC_CISRDY               (1 << 0)        /* CIS Ready */
 192 #define CC_BPRESEN              (1 << 1)        /* CCCR RES signal */
 193 #define CC_F2RDY                (1 << 2)        /* set CCCR IOR2 bit */
 194 #define CC_CLRPADSISO           (1 << 3)        /* clear SDIO pads isolation */
 195 #define CC_XMTDATAAVAIL_MODE    (1 << 4)
 196 #define CC_XMTDATAAVAIL_CTRL    (1 << 5)
 197
 198 /* SDA_FRAMECTRL */
 199 #define SFC_RF_TERM     (1 << 0)        /* Read Frame Terminate */
 200 #define SFC_WF_TERM     (1 << 1)        /* Write Frame Terminate */
 201 #define SFC_CRC4WOOS    (1 << 2)        /* CRC error for write out of sync */
 202 #define SFC_ABORTALL    (1 << 3)        /* Abort all in-progress frames */
 203
 204 /* HW frame tag */
 205 #define SDPCM_FRAMETAG_LEN      4       /* 2 bytes len, 2 bytes check val */
 206
 207 /* Total length of frame header for dongle protocol */
 208 #define SDPCM_HDRLEN    (SDPCM_FRAMETAG_LEN + SDPCM_SWHEADER_LEN)
 209 #define SDPCM_RESERVE   (SDPCM_HDRLEN + BRCMF_SDALIGN)
 210
 211 /*
 212  * Software allocation of To SB Mailbox resources
 213  */
 214
 215 /* tosbmailbox bits corresponding to intstatus bits */
 216 #define SMB_NAK         (1 << 0)        /* Frame NAK */
 217 #define SMB_INT_ACK     (1 << 1)        /* Host Interrupt ACK */
 218 #define SMB_USE_OOB     (1 << 2)        /* Use OOB Wakeup */
 219 #define SMB_DEV_INT     (1 << 3)        /* Miscellaneous Interrupt */
 220
 221 /* tosbmailboxdata */
 222 #define SMB_DATA_VERSION_SHIFT  16      /* host protocol version */
 223
 224 /*
 225  * Software allocation of To Host Mailbox resources
 226  */
 227
 228 /* intstatus bits */
 229 #define I_HMB_FC_STATE  I_HMB_SW0       /* Flow Control State */
 230 #define I_HMB_FC_CHANGE I_HMB_SW1       /* Flow Control State Changed */
 231 #define I_HMB_FRAME_IND I_HMB_SW2       /* Frame Indication */
 232 #define I_HMB_HOST_INT  I_HMB_SW3       /* Miscellaneous Interrupt */
 233
 234 /* tohostmailboxdata */
 235 #define HMB_DATA_NAKHANDLED     1       /* retransmit NAK'd frame */
 236 #define HMB_DATA_DEVREADY       2       /* talk to host after enable */
 237 #define HMB_DATA_FC             4       /* per prio flowcontrol update flag */
 238 #define HMB_DATA_FWREADY        8       /* fw ready for protocol activity */
 239
 240 #define HMB_DATA_FCDATA_MASK    0xff000000
 241 #define HMB_DATA_FCDATA_SHIFT   24
 242
 243 #define HMB_DATA_VERSION_MASK   0x00ff0000
 244 #define HMB_DATA_VERSION_SHIFT  16
 245
 246 /*
 247  * Software-defined protocol header
 248  */
 249
 250 /* Current protocol version */
 251 #define SDPCM_PROT_VERSION      4
 252
 253 /* SW frame header */
 254 #define SDPCM_PACKET_SEQUENCE(p)        (((u8 *)p)[0] & 0xff)
 255
 256 #define SDPCM_CHANNEL_MASK              0x00000f00
 257 #define SDPCM_CHANNEL_SHIFT             8
 258 #define SDPCM_PACKET_CHANNEL(p)         (((u8 *)p)[1] & 0x0f)
 259
 260 #define SDPCM_NEXTLEN_OFFSET            2
 261
 262 /* Data Offset from SOF (HW Tag, SW Tag, Pad) */
 263 #define SDPCM_DOFFSET_OFFSET            3       /* Data Offset */
 264 #define SDPCM_DOFFSET_VALUE(p)          (((u8 *)p)[SDPCM_DOFFSET_OFFSET] & 0xff)
 265 #define SDPCM_DOFFSET_MASK              0xff000000
 266 #define SDPCM_DOFFSET_SHIFT             24
 267 #define SDPCM_FCMASK_OFFSET             4       /* Flow control */
 268 #define SDPCM_FCMASK_VALUE(p)           (((u8 *)p)[SDPCM_FCMASK_OFFSET] & 0xff)
 269 #define SDPCM_WINDOW_OFFSET             5       /* Credit based fc */
 270 #define SDPCM_WINDOW_VALUE(p)           (((u8 *)p)[SDPCM_WINDOW_OFFSET] & 0xff)
 271
 272 #define SDPCM_SWHEADER_LEN      8       /* SW header is 64 bits */
 273
 274 /* logical channel numbers */
 275 #define SDPCM_CONTROL_CHANNEL   0       /* Control channel Id */
 276 #define SDPCM_EVENT_CHANNEL     1       /* Asyc Event Indication Channel Id */
 277 #define SDPCM_DATA_CHANNEL      2       /* Data Xmit/Recv Channel Id */
 278 #define SDPCM_GLOM_CHANNEL      3       /* For coalesced packets */
 279 #define SDPCM_TEST_CHANNEL      15      /* Reserved for test/debug packets */
 280
 281 #define SDPCM_SEQUENCE_WRAP     256     /* wrap-around val for 8bit frame seq */
 282
 283 #define SDPCM_GLOMDESC(p)       (((u8 *)p)[1] & 0x80)
 284
 285 /*
 286  * Shared structure between dongle and the host.
 287  * The structure contains pointers to trap or assert information.
 288  */
 289 #define SDPCM_SHARED_VERSION       0x0003
 290 #define SDPCM_SHARED_VERSION_MASK  0x00FF
 291 #define SDPCM_SHARED_ASSERT_BUILT  0x0100
 292 #define SDPCM_SHARED_ASSERT        0x0200
 293 #define SDPCM_SHARED_TRAP          0x0400
 294
 295 /* Space for header read, limit for data packets */
 296 #define MAX_HDR_READ    (1 << 6)
 297 #define MAX_RX_DATASZ   2048
 298
 299 /* Maximum milliseconds to wait for F2 to come up */
 300 #define BRCMF_WAIT_F2RDY        3000
 301
 302 /* Bump up limit on waiting for HT to account for first startup;
 303  * if the image is doing a CRC calculation before programming the PMU
 304  * for HT availability, it could take a couple hundred ms more, so
 305  * max out at a 1 second (1000000us).
 306  */
 307 #undef PMU_MAX_TRANSITION_DLY
 308 #define PMU_MAX_TRANSITION_DLY 1000000
 309
 310 /* Value for ChipClockCSR during initial setup */
 311 #define BRCMF_INIT_CLKCTL1      (SBSDIO_FORCE_HW_CLKREQ_OFF |   \
 312                                         SBSDIO_ALP_AVAIL_REQ)
 313
 314 /* Flags for SDH calls */
 315 #define F2SYNC  (SDIO_REQ_4BYTE | SDIO_REQ_FIXED)
 316
 317 #define BRCMF_SDIO_FW_NAME      "brcm/brcmfmac-sdio.bin"
 318 #define BRCMF_SDIO_NV_NAME      "brcm/brcmfmac-sdio.txt"
 319 MODULE_FIRMWARE(BRCMF_SDIO_FW_NAME);
 320 MODULE_FIRMWARE(BRCMF_SDIO_NV_NAME);
 321
 322 #define BRCMF_IDLE_IMMEDIATE    (-1)    /* Enter idle immediately */
 323 #define BRCMF_IDLE_ACTIVE       0       /* Do not request any SD clock change
 324                                          * when idle
 325                                          */
 326 #define BRCMF_IDLE_INTERVAL     1
 327
 328 /*
 329  * Conversion of 802.1D priority to precedence level
 330  */
 331 static uint prio2prec(u32 prio)
 332 {
 333         return (prio == PRIO_8021D_NONE || prio == PRIO_8021D_BE) ?
 334                (prio^2) : prio;
 335 }
 336
 337 /* core registers */
 338 struct sdpcmd_regs {
 339         u32 corecontrol;                /* 0x00, rev8 */
 340         u32 corestatus;                 /* rev8 */
 341         u32 PAD[1];
 342         u32 biststatus;                 /* rev8 */
 343
 344         /* PCMCIA access */
 345         u16 pcmciamesportaladdr;        /* 0x010, rev8 */
 346         u16 PAD[1];
 347         u16 pcmciamesportalmask;        /* rev8 */
 348         u16 PAD[1];
 349         u16 pcmciawrframebc;            /* rev8 */
 350         u16 PAD[1];
 351         u16 pcmciaunderflowtimer;       /* rev8 */
 352         u16 PAD[1];
 353
 354         /* interrupt */
 355         u32 intstatus;                  /* 0x020, rev8 */
 356         u32 hostintmask;                /* rev8 */
 357         u32 intmask;                    /* rev8 */
 358         u32 sbintstatus;                /* rev8 */
 359         u32 sbintmask;                  /* rev8 */
 360         u32 funcintmask;                /* rev4 */
 361         u32 PAD[2];
 362         u32 tosbmailbox;                /* 0x040, rev8 */
 363         u32 tohostmailbox;              /* rev8 */
 364         u32 tosbmailboxdata;            /* rev8 */
 365         u32 tohostmailboxdata;          /* rev8 */
 366
 367         /* synchronized access to registers in SDIO clock domain */
 368         u32 sdioaccess;                 /* 0x050, rev8 */
 369         u32 PAD[3];
 370
 371         /* PCMCIA frame control */
 372         u8 pcmciaframectrl;             /* 0x060, rev8 */
 373         u8 PAD[3];
 374         u8 pcmciawatermark;             /* rev8 */
 375         u8 PAD[155];
 376
 377         /* interrupt batching control */
 378         u32 intrcvlazy;                 /* 0x100, rev8 */
 379         u32 PAD[3];
 380
 381         /* counters */
 382         u32 cmd52rd;                    /* 0x110, rev8 */
 383         u32 cmd52wr;                    /* rev8 */
 384         u32 cmd53rd;                    /* rev8 */
 385         u32 cmd53wr;                    /* rev8 */
 386         u32 abort;                      /* rev8 */
 387         u32 datacrcerror;               /* rev8 */
 388         u32 rdoutofsync;                /* rev8 */
 389         u32 wroutofsync;                /* rev8 */
 390         u32 writebusy;                  /* rev8 */
 391         u32 readwait;                   /* rev8 */
 392         u32 readterm;                   /* rev8 */
 393         u32 writeterm;                  /* rev8 */
 394         u32 PAD[40];
 395         u32 clockctlstatus;             /* rev8 */
 396         u32 PAD[7];
 397
 398         u32 PAD[128];                   /* DMA engines */
 399
 400         /* SDIO/PCMCIA CIS region */
 401         char cis[512];                  /* 0x400-0x5ff, rev6 */
 402
 403         /* PCMCIA function control registers */
 404         char pcmciafcr[256];            /* 0x600-6ff, rev6 */
 405         u16 PAD[55];
 406
 407         /* PCMCIA backplane access */
 408         u16 backplanecsr;               /* 0x76E, rev6 */
 409         u16 backplaneaddr0;             /* rev6 */
 410         u16 backplaneaddr1;             /* rev6 */
 411         u16 backplaneaddr2;             /* rev6 */
 412         u16 backplaneaddr3;             /* rev6 */
 413         u16 backplanedata0;             /* rev6 */
 414         u16 backplanedata1;             /* rev6 */
 415         u16 backplanedata2;             /* rev6 */
 416         u16 backplanedata3;             /* rev6 */
 417         u16 PAD[31];
 418
 419         /* sprom "size" & "blank" info */
 420         u16 spromstatus;                /* 0x7BE, rev2 */
 421         u32 PAD[464];
 422
 423         u16 PAD[0x80];
 424 };
 425
 426 #ifdef DEBUG
 427 /* Device console log buffer state */
 428 struct brcmf_console {
 429         uint count;             /* Poll interval msec counter */
 430         uint log_addr;          /* Log struct address (fixed) */
 431         struct rte_log_le log_le;       /* Log struct (host copy) */
 432         uint bufsize;           /* Size of log buffer */
 433         u8 *buf;                /* Log buffer (host copy) */
 434         uint last;              /* Last buffer read index */
 435 };
 436
 437 struct brcmf_trap_info {
 438         __le32          type;
 439         __le32          epc;
 440         __le32          cpsr;
 441         __le32          spsr;
 442         __le32          r0;     /* a1 */
 443         __le32          r1;     /* a2 */
 444         __le32          r2;     /* a3 */
 445         __le32          r3;     /* a4 */
 446         __le32          r4;     /* v1 */
 447         __le32          r5;     /* v2 */
 448         __le32          r6;     /* v3 */
 449         __le32          r7;     /* v4 */
 450         __le32          r8;     /* v5 */
 451         __le32          r9;     /* sb/v6 */
 452         __le32          r10;    /* sl/v7 */
 453         __le32          r11;    /* fp/v8 */
 454         __le32          r12;    /* ip */
 455         __le32          r13;    /* sp */
 456         __le32          r14;    /* lr */
 457         __le32          pc;     /* r15 */
 458 };
 459 #endif                          /* DEBUG */
 460
 461 struct sdpcm_shared {
 462         u32 flags;
 463         u32 trap_addr;
 464         u32 assert_exp_addr;
 465         u32 assert_file_addr;
 466         u32 assert_line;
 467         u32 console_addr;       /* Address of struct rte_console */
 468         u32 msgtrace_addr;
 469         u8 tag[32];
 470         u32 brpt_addr;
 471 };
 472
 473 struct sdpcm_shared_le {
 474         __le32 flags;
 475         __le32 trap_addr;
 476         __le32 assert_exp_addr;
 477         __le32 assert_file_addr;
 478         __le32 assert_line;
 479         __le32 console_addr;    /* Address of struct rte_console */
 480         __le32 msgtrace_addr;
 481         u8 tag[32];
 482         __le32 brpt_addr;
 483 };
 484
 485
 486 /* misc chip info needed by some of the routines */
 487 /* Private data for SDIO bus interaction */
 488 struct brcmf_sdio {
 489         struct brcmf_sdio_dev *sdiodev; /* sdio device handler */
 490         struct chip_info *ci;   /* Chip info struct */
 491         char *vars;             /* Variables (from CIS and/or other) */
 492         uint varsz;             /* Size of variables buffer */
 493
 494         u32 ramsize;            /* Size of RAM in SOCRAM (bytes) */
 495
 496         u32 hostintmask;        /* Copy of Host Interrupt Mask */
 497         u32 intstatus;  /* Intstatus bits (events) pending */
 498         bool dpc_sched;         /* Indicates DPC schedule (intrpt rcvd) */
 499         bool fcstate;           /* State of dongle flow-control */
 500
 501         uint blocksize;         /* Block size of SDIO transfers */
 502         uint roundup;           /* Max roundup limit */
 503
 504         struct pktq txq;        /* Queue length used for flow-control */
 505         u8 flowcontrol; /* per prio flow control bitmask */
 506         u8 tx_seq;              /* Transmit sequence number (next) */
 507         u8 tx_max;              /* Maximum transmit sequence allowed */
 508
 509         u8 hdrbuf[MAX_HDR_READ + BRCMF_SDALIGN];
 510         u8 *rxhdr;              /* Header of current rx frame (in hdrbuf) */
 511         u16 nextlen;            /* Next Read Len from last header */
 512         u8 rx_seq;              /* Receive sequence number (expected) */
 513         bool rxskip;            /* Skip receive (awaiting NAK ACK) */
 514
 515         uint rxbound;           /* Rx frames to read before resched */
 516         uint txbound;           /* Tx frames to send before resched */
 517         uint txminmax;
 518
 519         struct sk_buff *glomd;  /* Packet containing glomming descriptor */
 520         struct sk_buff_head glom; /* Packet list for glommed superframe */
 521         uint glomerr;           /* Glom packet read errors */
 522
 523         u8 *rxbuf;              /* Buffer for receiving control packets */
 524         uint rxblen;            /* Allocated length of rxbuf */
 525         u8 *rxctl;              /* Aligned pointer into rxbuf */
 526         u8 *databuf;            /* Buffer for receiving big glom packet */
 527         u8 *dataptr;            /* Aligned pointer into databuf */
 528         uint rxlen;             /* Length of valid data in buffer */
 529
 530         u8 sdpcm_ver;   /* Bus protocol reported by dongle */
 531
 532         bool intr;              /* Use interrupts */
 533         bool poll;              /* Use polling */
 534         bool ipend;             /* Device interrupt is pending */
 535         uint spurious;          /* Count of spurious interrupts */
 536         uint pollrate;          /* Ticks between device polls */
 537         uint polltick;          /* Tick counter */
 538
 539 #ifdef DEBUG
 540         uint console_interval;
 541         struct brcmf_console console;   /* Console output polling support */
 542         uint console_addr;      /* Console address from shared struct */
 543 #endif                          /* DEBUG */
 544
 545         uint clkstate;          /* State of sd and backplane clock(s) */
 546         bool activity;          /* Activity flag for clock down */
 547         s32 idletime;           /* Control for activity timeout */
 548         s32 idlecount;  /* Activity timeout counter */
 549         s32 idleclock;  /* How to set bus driver when idle */
 550         s32 sd_rxchain;
 551         bool use_rxchain;       /* If brcmf should use PKT chains */
 552         bool rxflow_mode;       /* Rx flow control mode */
 553         bool rxflow;            /* Is rx flow control on */
 554         bool alp_only;          /* Don't use HT clock (ALP only) */
 555 /* Field to decide if rx of control frames happen in rxbuf or lb-pool */
 556         bool usebufpool;
 557
 558         u8 *ctrl_frame_buf;
 559         u32 ctrl_frame_len;
 560         bool ctrl_frame_stat;
 561
 562         spinlock_t txqlock;
 563         wait_queue_head_t ctrl_wait;
 564         wait_queue_head_t dcmd_resp_wait;
 565
 566         struct timer_list timer;
 567         struct completion watchdog_wait;
 568         struct task_struct *watchdog_tsk;
 569         bool wd_timer_valid;
 570         uint save_ms;
 571
 572         struct task_struct *dpc_tsk;
 573         struct completion dpc_wait;
 574         struct list_head dpc_tsklst;
 575         spinlock_t dpc_tl_lock;
 576
 577         struct semaphore sdsem;
 578
 579         const struct firmware *firmware;
 580         u32 fw_ptr;
 581
 582         bool txoff;             /* Transmit flow-controlled */
 583         struct brcmf_sdio_count sdcnt;
 584 };
 585
 586 /* clkstate */
 587 #define CLK_NONE        0
 588 #define CLK_SDONLY      1
 589 #define CLK_PENDING     2       /* Not used yet */
 590 #define CLK_AVAIL       3
 591
 592 #ifdef DEBUG
 593 static int qcount[NUMPRIO];
 594 static int tx_packets[NUMPRIO];
 595 #endif                          /* DEBUG */
 596
 597 #define SDIO_DRIVE_STRENGTH     6       /* in milliamps */
 598
 599 #define RETRYCHAN(chan) ((chan) == SDPCM_EVENT_CHANNEL)
 600
 601 /* Retry count for register access failures */
 602 static const uint retry_limit = 2;
 603
 604 /* Limit on rounding up frames */
 605 static const uint max_roundup = 512;
 606
 607 #define ALIGNMENT  4
 608
 609 static void pkt_align(struct sk_buff *p, int len, int align)
 610 {
 611         uint datalign;
 612         datalign = (unsigned long)(p->data);
 613         datalign = roundup(datalign, (align)) - datalign;
 614         if (datalign)
 615                 skb_pull(p, datalign);
 616         __skb_trim(p, len);
 617 }
 618
 619 /* To check if there's window offered */
 620 static bool data_ok(struct brcmf_sdio *bus)
 621 {
 622         return (u8)(bus->tx_max - bus->tx_seq) != 0 &&
 623                ((u8)(bus->tx_max - bus->tx_seq) & 0x80) == 0;
 624 }
 625
 626 /*
 627  * Reads a register in the SDIO hardware block. This block occupies a series of
 628  * adresses on the 32 bit backplane bus.
 629  */
 630 static int
 631 r_sdreg32(struct brcmf_sdio *bus, u32 *regvar, u32 offset)
 632 {
 633         u8 idx = brcmf_sdio_chip_getinfidx(bus->ci, BCMA_CORE_SDIO_DEV);
 634         int ret;
 635
 636         *regvar = brcmf_sdio_regrl(bus->sdiodev,
 637                                    bus->ci->c_inf[idx].base + offset, &ret);
 638
 639         return ret;
 640 }
 641
 642 static int
 643 w_sdreg32(struct brcmf_sdio *bus, u32 regval, u32 reg_offset)
 644 {
 645         u8 idx = brcmf_sdio_chip_getinfidx(bus->ci, BCMA_CORE_SDIO_DEV);
 646         int ret;
 647
 648         brcmf_sdio_regwl(bus->sdiodev,
 649                          bus->ci->c_inf[idx].base + reg_offset,
 650                          regval, &ret);
 651
 652         return ret;
 653 }
 654
 655 #define PKT_AVAILABLE()         (intstatus & I_HMB_FRAME_IND)
 656
 657 #define HOSTINTMASK             (I_HMB_SW_MASK | I_CHIPACTIVE)
 658
 659 /* Packet free applicable unconditionally for sdio and sdspi.
 660  * Conditional if bufpool was present for gspi bus.
 661  */
 662 static void brcmf_sdbrcm_pktfree2(struct brcmf_sdio *bus, struct sk_buff *pkt)
 663 {
 664         if (bus->usebufpool)
 665                 brcmu_pkt_buf_free_skb(pkt);
 666 }
 667
 668 /* Turn backplane clock on or off */
 669 static int brcmf_sdbrcm_htclk(struct brcmf_sdio *bus, bool on, bool pendok)
 670 {
 671         int err;
 672         u8 clkctl, clkreq, devctl;
 673         unsigned long timeout;
 674
 675         brcmf_dbg(TRACE, "Enter\n");
 676
 677         clkctl = 0;
 678
 679         if (on) {
 680                 /* Request HT Avail */
 681                 clkreq =
 682                     bus->alp_only ? SBSDIO_ALP_AVAIL_REQ : SBSDIO_HT_AVAIL_REQ;
 683
 684                 brcmf_sdio_regwb(bus->sdiodev, SBSDIO_FUNC1_CHIPCLKCSR,
 685                                  clkreq, &err);
 686                 if (err) {
 687                         brcmf_dbg(ERROR, "HT Avail request error: %d\n", err);
 688                         return -EBADE;
 689                 }
 690
 691                 /* Check current status */
 692                 clkctl = brcmf_sdio_regrb(bus->sdiodev,
 693                                           SBSDIO_FUNC1_CHIPCLKCSR, &err);
 694                 if (err) {
 695                         brcmf_dbg(ERROR, "HT Avail read error: %d\n", err);
 696                         return -EBADE;
 697                 }
 698
 699                 /* Go to pending and await interrupt if appropriate */
 700                 if (!SBSDIO_CLKAV(clkctl, bus->alp_only) && pendok) {
 701                         /* Allow only clock-available interrupt */
 702                         devctl = brcmf_sdio_regrb(bus->sdiodev,
 703                                                   SBSDIO_DEVICE_CTL, &err);
 704                         if (err) {
 705                                 brcmf_dbg(ERROR, "Devctl error setting CA: %d\n",
 706                                           err);
 707                                 return -EBADE;
 708                         }
 709
 710                         devctl |= SBSDIO_DEVCTL_CA_INT_ONLY;
 711                         brcmf_sdio_regwb(bus->sdiodev, SBSDIO_DEVICE_CTL,
 712                                          devctl, &err);
 713                         brcmf_dbg(INFO, "CLKCTL: set PENDING\n");
 714                         bus->clkstate = CLK_PENDING;
 715
 716                         return 0;
 717                 } else if (bus->clkstate == CLK_PENDING) {
 718                         /* Cancel CA-only interrupt filter */
 719                         devctl = brcmf_sdio_regrb(bus->sdiodev,
 720                                                   SBSDIO_DEVICE_CTL, &err);
 721                         devctl &= ~SBSDIO_DEVCTL_CA_INT_ONLY;
 722                         brcmf_sdio_regwb(bus->sdiodev, SBSDIO_DEVICE_CTL,
 723                                          devctl, &err);
 724                 }
 725
 726                 /* Otherwise, wait here (polling) for HT Avail */
 727                 timeout = jiffies +
 728                           msecs_to_jiffies(PMU_MAX_TRANSITION_DLY/1000);
 729                 while (!SBSDIO_CLKAV(clkctl, bus->alp_only)) {
 730                         clkctl = brcmf_sdio_regrb(bus->sdiodev,
 731                                                   SBSDIO_FUNC1_CHIPCLKCSR,
 732                                                   &err);
 733                         if (time_after(jiffies, timeout))
 734                                 break;
 735                         else
 736                                 usleep_range(5000, 10000);
 737                 }
 738                 if (err) {
 739                         brcmf_dbg(ERROR, "HT Avail request error: %d\n", err);
 740                         return -EBADE;
 741                 }
 742                 if (!SBSDIO_CLKAV(clkctl, bus->alp_only)) {
 743                         brcmf_dbg(ERROR, "HT Avail timeout (%d): clkctl 0x%02x\n",
 744                                   PMU_MAX_TRANSITION_DLY, clkctl);
 745                         return -EBADE;
 746                 }
 747
 748                 /* Mark clock available */
 749                 bus->clkstate = CLK_AVAIL;
 750                 brcmf_dbg(INFO, "CLKCTL: turned ON\n");
 751
 752 #if defined(DEBUG)
 753                 if (!bus->alp_only) {
 754                         if (SBSDIO_ALPONLY(clkctl))
 755                                 brcmf_dbg(ERROR, "HT Clock should be on\n");
 756                 }
 757 #endif                          /* defined (DEBUG) */
 758
 759                 bus->activity = true;
 760         } else {
 761                 clkreq = 0;
 762
 763                 if (bus->clkstate == CLK_PENDING) {
 764                         /* Cancel CA-only interrupt filter */
 765                         devctl = brcmf_sdio_regrb(bus->sdiodev,
 766                                                   SBSDIO_DEVICE_CTL, &err);
 767                         devctl &= ~SBSDIO_DEVCTL_CA_INT_ONLY;
 768                         brcmf_sdio_regwb(bus->sdiodev, SBSDIO_DEVICE_CTL,
 769                                          devctl, &err);
 770                 }
 771
 772                 bus->clkstate = CLK_SDONLY;
 773                 brcmf_sdio_regwb(bus->sdiodev, SBSDIO_FUNC1_CHIPCLKCSR,
 774                                  clkreq, &err);
 775                 brcmf_dbg(INFO, "CLKCTL: turned OFF\n");
 776                 if (err) {
 777                         brcmf_dbg(ERROR, "Failed access turning clock off: %d\n",
 778                                   err);
 779                         return -EBADE;
 780                 }
 781         }
 782         return 0;
 783 }
 784
 785 /* Change idle/active SD state */
 786 static int brcmf_sdbrcm_sdclk(struct brcmf_sdio *bus, bool on)
 787 {
 788         brcmf_dbg(TRACE, "Enter\n");
 789
 790         if (on)
 791                 bus->clkstate = CLK_SDONLY;
 792         else
 793                 bus->clkstate = CLK_NONE;
 794
 795         return 0;
 796 }
 797
 798 /* Transition SD and backplane clock readiness */
 799 static int brcmf_sdbrcm_clkctl(struct brcmf_sdio *bus, uint target, bool pendok)
 800 {
 801 #ifdef DEBUG
 802         uint oldstate = bus->clkstate;
 803 #endif                          /* DEBUG */
 804
 805         brcmf_dbg(TRACE, "Enter\n");
 806
 807         /* Early exit if we're already there */
 808         if (bus->clkstate == target) {
 809                 if (target == CLK_AVAIL) {
 810                         brcmf_sdbrcm_wd_timer(bus, BRCMF_WD_POLL_MS);
 811                         bus->activity = true;
 812                 }
 813                 return 0;
 814         }
 815
 816         switch (target) {
 817         case CLK_AVAIL:
 818                 /* Make sure SD clock is available */
 819                 if (bus->clkstate == CLK_NONE)
 820                         brcmf_sdbrcm_sdclk(bus, true);
 821                 /* Now request HT Avail on the backplane */
 822                 brcmf_sdbrcm_htclk(bus, true, pendok);
 823                 brcmf_sdbrcm_wd_timer(bus, BRCMF_WD_POLL_MS);
 824                 bus->activity = true;
 825                 break;
 826
 827         case CLK_SDONLY:
 828                 /* Remove HT request, or bring up SD clock */
 829                 if (bus->clkstate == CLK_NONE)
 830                         brcmf_sdbrcm_sdclk(bus, true);
 831                 else if (bus->clkstate == CLK_AVAIL)
 832                         brcmf_sdbrcm_htclk(bus, false, false);
 833                 else
 834                         brcmf_dbg(ERROR, "request for %d -> %d\n",
 835                                   bus->clkstate, target);
 836                 brcmf_sdbrcm_wd_timer(bus, BRCMF_WD_POLL_MS);
 837                 break;
 838
 839         case CLK_NONE:
 840                 /* Make sure to remove HT request */
 841                 if (bus->clkstate == CLK_AVAIL)
 842                         brcmf_sdbrcm_htclk(bus, false, false);
 843                 /* Now remove the SD clock */
 844                 brcmf_sdbrcm_sdclk(bus, false);
 845                 brcmf_sdbrcm_wd_timer(bus, 0);
 846                 break;
 847         }
 848 #ifdef DEBUG
 849         brcmf_dbg(INFO, "%d -> %d\n", oldstate, bus->clkstate);
 850 #endif                          /* DEBUG */
 851
 852         return 0;
 853 }
 854
 855 static u32 brcmf_sdbrcm_hostmail(struct brcmf_sdio *bus)
 856 {
 857         u32 intstatus = 0;
 858         u32 hmb_data;
 859         u8 fcbits;
 860         int ret;
 861
 862         brcmf_dbg(TRACE, "Enter\n");
 863
 864         /* Read mailbox data and ack that we did so */
 865         ret = r_sdreg32(bus, &hmb_data,
 866                         offsetof(struct sdpcmd_regs, tohostmailboxdata));
 867
 868         if (ret == 0)
 869                 w_sdreg32(bus, SMB_INT_ACK,
 870                           offsetof(struct sdpcmd_regs, tosbmailbox));
 871         bus->sdcnt.f1regdata += 2;
 872
 873         /* Dongle recomposed rx frames, accept them again */
 874         if (hmb_data & HMB_DATA_NAKHANDLED) {
 875                 brcmf_dbg(INFO, "Dongle reports NAK handled, expect rtx of %d\n",
 876                           bus->rx_seq);
 877                 if (!bus->rxskip)
 878                         brcmf_dbg(ERROR, "unexpected NAKHANDLED!\n");
 879
 880                 bus->rxskip = false;
 881                 intstatus |= I_HMB_FRAME_IND;
 882         }
 883
 884         /*
 885          * DEVREADY does not occur with gSPI.
 886          */
 887         if (hmb_data & (HMB_DATA_DEVREADY | HMB_DATA_FWREADY)) {
 888                 bus->sdpcm_ver =
 889                     (hmb_data & HMB_DATA_VERSION_MASK) >>
 890                     HMB_DATA_VERSION_SHIFT;
 891                 if (bus->sdpcm_ver != SDPCM_PROT_VERSION)
 892                         brcmf_dbg(ERROR, "Version mismatch, dongle reports %d, "
 893                                   "expecting %d\n",
 894                                   bus->sdpcm_ver, SDPCM_PROT_VERSION);
 895                 else
 896                         brcmf_dbg(INFO, "Dongle ready, protocol version %d\n",
 897                                   bus->sdpcm_ver);
 898         }
 899
 900         /*
 901          * Flow Control has been moved into the RX headers and this out of band
 902          * method isn't used any more.
 903          * remaining backward compatible with older dongles.
 904          */
 905         if (hmb_data & HMB_DATA_FC) {
 906                 fcbits = (hmb_data & HMB_DATA_FCDATA_MASK) >>
 907                                                         HMB_DATA_FCDATA_SHIFT;
 908
 909                 if (fcbits & ~bus->flowcontrol)
 910                         bus->sdcnt.fc_xoff++;
 911
 912                 if (bus->flowcontrol & ~fcbits)
 913                         bus->sdcnt.fc_xon++;
 914
 915                 bus->sdcnt.fc_rcvd++;
 916                 bus->flowcontrol = fcbits;
 917         }
 918
 919         /* Shouldn't be any others */
 920         if (hmb_data & ~(HMB_DATA_DEVREADY |
 921                          HMB_DATA_NAKHANDLED |
 922                          HMB_DATA_FC |
 923                          HMB_DATA_FWREADY |
 924                          HMB_DATA_FCDATA_MASK | HMB_DATA_VERSION_MASK))
 925                 brcmf_dbg(ERROR, "Unknown mailbox data content: 0x%02x\n",
 926                           hmb_data);
 927
 928         return intstatus;
 929 }
 930
 931 static void brcmf_sdbrcm_rxfail(struct brcmf_sdio *bus, bool abort, bool rtx)
 932 {
 933         uint retries = 0;
 934         u16 lastrbc;
 935         u8 hi, lo;
 936         int err;
 937
 938         brcmf_dbg(ERROR, "%sterminate frame%s\n",
 939                   abort ? "abort command, " : "",
 940                   rtx ? ", send NAK" : "");
 941
 942         if (abort)
 943                 brcmf_sdcard_abort(bus->sdiodev, SDIO_FUNC_2);
 944
 945         brcmf_sdio_regwb(bus->sdiodev, SBSDIO_FUNC1_FRAMECTRL,
 946                          SFC_RF_TERM, &err);
 947         bus->sdcnt.f1regdata++;
 948
 949         /* Wait until the packet has been flushed (device/FIFO stable) */
 950         for (lastrbc = retries = 0xffff; retries > 0; retries--) {
 951                 hi = brcmf_sdio_regrb(bus->sdiodev,
 952                                       SBSDIO_FUNC1_RFRAMEBCHI, &err);
 953                 lo = brcmf_sdio_regrb(bus->sdiodev,
 954                                       SBSDIO_FUNC1_RFRAMEBCLO, &err);
 955                 bus->sdcnt.f1regdata += 2;
 956
 957                 if ((hi == 0) && (lo == 0))
 958                         break;
 959
 960                 if ((hi > (lastrbc >> 8)) && (lo > (lastrbc & 0x00ff))) {
 961                         brcmf_dbg(ERROR, "count growing: last 0x%04x now 0x%04x\n",
 962                                   lastrbc, (hi << 8) + lo);
 963                 }
 964                 lastrbc = (hi << 8) + lo;
 965         }
 966
 967         if (!retries)
 968                 brcmf_dbg(ERROR, "count never zeroed: last 0x%04x\n", lastrbc);
 969         else
 970                 brcmf_dbg(INFO, "flush took %d iterations\n", 0xffff - retries);
 971
 972         if (rtx) {
 973                 bus->sdcnt.rxrtx++;
 974                 err = w_sdreg32(bus, SMB_NAK,
 975                                 offsetof(struct sdpcmd_regs, tosbmailbox));
 976
 977                 bus->sdcnt.f1regdata++;
 978                 if (err == 0)
 979                         bus->rxskip = true;
 980         }
 981
 982         /* Clear partial in any case */
 983         bus->nextlen = 0;
 984
 985         /* If we can't reach the device, signal failure */
 986         if (err)
 987                 bus->sdiodev->bus_if->state = BRCMF_BUS_DOWN;
 988 }
 989
 990 /* copy a buffer into a pkt buffer chain */
 991 static uint brcmf_sdbrcm_glom_from_buf(struct brcmf_sdio *bus, uint len)
 992 {
 993         uint n, ret = 0;
 994         struct sk_buff *p;
 995         u8 *buf;
 996
 997         buf = bus->dataptr;
 998
 999         /* copy the data */
1000         skb_queue_walk(&bus->glom, p) {
1001                 n = min_t(uint, p->len, len);
1002                 memcpy(p->data, buf, n);
1003                 buf += n;
1004                 len -= n;
1005                 ret += n;
1006                 if (!len)
1007                         break;
1008         }
1009
1010         return ret;
1011 }
1012
1013 /* return total length of buffer chain */
1014 static uint brcmf_sdbrcm_glom_len(struct brcmf_sdio *bus)
1015 {
1016         struct sk_buff *p;
1017         uint total;
1018
1019         total = 0;
1020         skb_queue_walk(&bus->glom, p)
1021                 total += p->len;
1022         return total;
1023 }
1024
1025 static void brcmf_sdbrcm_free_glom(struct brcmf_sdio *bus)
1026 {
1027         struct sk_buff *cur, *next;
1028
1029         skb_queue_walk_safe(&bus->glom, cur, next) {
1030                 skb_unlink(cur, &bus->glom);
1031                 brcmu_pkt_buf_free_skb(cur);
1032         }
1033 }
1034
1035 static u8 brcmf_sdbrcm_rxglom(struct brcmf_sdio *bus, u8 rxseq)
1036 {
1037         u16 dlen, totlen;
1038         u8 *dptr, num = 0;
1039
1040         u16 sublen, check;
1041         struct sk_buff *pfirst, *pnext;
1042
1043         int errcode;
1044         u8 chan, seq, doff, sfdoff;
1045         u8 txmax;
1046
1047         int ifidx = 0;
1048         bool usechain = bus->use_rxchain;
1049
1050         /* If packets, issue read(s) and send up packet chain */
1051         /* Return sequence numbers consumed? */
1052
1053         brcmf_dbg(TRACE, "start: glomd %p glom %p\n",
1054                   bus->glomd, skb_peek(&bus->glom));
1055
1056         /* If there's a descriptor, generate the packet chain */
1057         if (bus->glomd) {
1058                 pfirst = pnext = NULL;
1059                 dlen = (u16) (bus->glomd->len);
1060                 dptr = bus->glomd->data;
1061                 if (!dlen || (dlen & 1)) {
1062                         brcmf_dbg(ERROR, "bad glomd len(%d), ignore descriptor\n",
1063                                   dlen);
1064                         dlen = 0;
1065                 }
1066
1067                 for (totlen = num = 0; dlen; num++) {
1068                         /* Get (and move past) next length */
1069                         sublen = get_unaligned_le16(dptr);
1070                         dlen -= sizeof(u16);
1071                         dptr += sizeof(u16);
1072                         if ((sublen < SDPCM_HDRLEN) ||
1073                             ((num == 0) && (sublen < (2 * SDPCM_HDRLEN)))) {
1074                                 brcmf_dbg(ERROR, "descriptor len %d bad: %d\n",
1075                                           num, sublen);
1076                                 pnext = NULL;
1077                                 break;
1078                         }
1079                         if (sublen % BRCMF_SDALIGN) {
1080                                 brcmf_dbg(ERROR, "sublen %d not multiple of %d\n",
1081                                           sublen, BRCMF_SDALIGN);
1082                                 usechain = false;
1083                         }
1084                         totlen += sublen;
1085
1086                         /* For last frame, adjust read len so total
1087                                  is a block multiple */
1088                         if (!dlen) {
1089                                 sublen +=
1090                                     (roundup(totlen, bus->blocksize) - totlen);
1091                                 totlen = roundup(totlen, bus->blocksize);
1092                         }
1093
1094                         /* Allocate/chain packet for next subframe */
1095                         pnext = brcmu_pkt_buf_get_skb(sublen + BRCMF_SDALIGN);
1096                         if (pnext == NULL) {
1097                                 brcmf_dbg(ERROR, "bcm_pkt_buf_get_skb failed, num %d len %d\n",
1098                                           num, sublen);
1099                                 break;
1100                         }
1101                         skb_queue_tail(&bus->glom, pnext);
1102
1103                         /* Adhere to start alignment requirements */
1104                         pkt_align(pnext, sublen, BRCMF_SDALIGN);
1105                 }
1106
1107                 /* If all allocations succeeded, save packet chain
1108                          in bus structure */
1109                 if (pnext) {
1110                         brcmf_dbg(GLOM, "allocated %d-byte packet chain for %d subframes\n",
1111                                   totlen, num);
1112                         if (BRCMF_GLOM_ON() && bus->nextlen &&
1113                             totlen != bus->nextlen) {
1114                                 brcmf_dbg(GLOM, "glomdesc mismatch: nextlen %d glomdesc %d rxseq %d\n",
1115                                           bus->nextlen, totlen, rxseq);
1116                         }
1117                         pfirst = pnext = NULL;
1118                 } else {
1119                         brcmf_sdbrcm_free_glom(bus);
1120                         num = 0;
1121                 }
1122
1123                 /* Done with descriptor packet */
1124                 brcmu_pkt_buf_free_skb(bus->glomd);
1125                 bus->glomd = NULL;
1126                 bus->nextlen = 0;
1127         }
1128
1129         /* Ok -- either we just generated a packet chain,
1130                  or had one from before */
1131         if (!skb_queue_empty(&bus->glom)) {
1132                 if (BRCMF_GLOM_ON()) {
1133                         brcmf_dbg(GLOM, "try superframe read, packet chain:\n");
1134                         skb_queue_walk(&bus->glom, pnext) {
1135                                 brcmf_dbg(GLOM, "    %p: %p len 0x%04x (%d)\n",
1136                                           pnext, (u8 *) (pnext->data),
1137                                           pnext->len, pnext->len);
1138                         }
1139                 }
1140
1141                 pfirst = skb_peek(&bus->glom);
1142                 dlen = (u16) brcmf_sdbrcm_glom_len(bus);
1143
1144                 /* Do an SDIO read for the superframe.  Configurable iovar to
1145                  * read directly into the chained packet, or allocate a large
1146                  * packet and and copy into the chain.
1147                  */
1148                 if (usechain) {
1149                         errcode = brcmf_sdcard_recv_chain(bus->sdiodev,
1150                                         bus->sdiodev->sbwad,
1151                                         SDIO_FUNC_2, F2SYNC, &bus->glom);
1152                 } else if (bus->dataptr) {
1153                         errcode = brcmf_sdcard_recv_buf(bus->sdiodev,
1154                                         bus->sdiodev->sbwad,
1155                                         SDIO_FUNC_2, F2SYNC,
1156                                         bus->dataptr, dlen);
1157                         sublen = (u16) brcmf_sdbrcm_glom_from_buf(bus, dlen);
1158                         if (sublen != dlen) {
1159                                 brcmf_dbg(ERROR, "FAILED TO COPY, dlen %d sublen %d\n",
1160                                           dlen, sublen);
1161                                 errcode = -1;
1162                         }
1163                         pnext = NULL;
1164                 } else {
1165                         brcmf_dbg(ERROR, "COULDN'T ALLOC %d-BYTE GLOM, FORCE FAILURE\n",
1166                                   dlen);
1167                         errcode = -1;
1168                 }
1169                 bus->sdcnt.f2rxdata++;
1170
1171                 /* On failure, kill the superframe, allow a couple retries */
1172                 if (errcode < 0) {
1173                         brcmf_dbg(ERROR, "glom read of %d bytes failed: %d\n",
1174                                   dlen, errcode);
1175                         bus->sdiodev->bus_if->dstats.rx_errors++;
1176
1177                         if (bus->glomerr++ < 3) {
1178                                 brcmf_sdbrcm_rxfail(bus, true, true);
1179                         } else {
1180                                 bus->glomerr = 0;
1181                                 brcmf_sdbrcm_rxfail(bus, true, false);
1182                                 bus->sdcnt.rxglomfail++;
1183                                 brcmf_sdbrcm_free_glom(bus);
1184                         }
1185                         return 0;
1186                 }
1187
1188                 brcmf_dbg_hex_dump(BRCMF_GLOM_ON(),
1189                                    pfirst->data, min_t(int, pfirst->len, 48),
1190                                    "SUPERFRAME:\n");
1191
1192                 /* Validate the superframe header */
1193                 dptr = (u8 *) (pfirst->data);
1194                 sublen = get_unaligned_le16(dptr);
1195                 check = get_unaligned_le16(dptr + sizeof(u16));
1196
1197                 chan = SDPCM_PACKET_CHANNEL(&dptr[SDPCM_FRAMETAG_LEN]);
1198                 seq = SDPCM_PACKET_SEQUENCE(&dptr[SDPCM_FRAMETAG_LEN]);
1199                 bus->nextlen = dptr[SDPCM_FRAMETAG_LEN + SDPCM_NEXTLEN_OFFSET];
1200                 if ((bus->nextlen << 4) > MAX_RX_DATASZ) {
1201                         brcmf_dbg(INFO, "nextlen too large (%d) seq %d\n",
1202                                   bus->nextlen, seq);
1203                         bus->nextlen = 0;
1204                 }
1205                 doff = SDPCM_DOFFSET_VALUE(&dptr[SDPCM_FRAMETAG_LEN]);
1206                 txmax = SDPCM_WINDOW_VALUE(&dptr[SDPCM_FRAMETAG_LEN]);
1207
1208                 errcode = 0;
1209                 if ((u16)~(sublen ^ check)) {
1210                         brcmf_dbg(ERROR, "(superframe): HW hdr error: len/check 0x%04x/0x%04x\n",
1211                                   sublen, check);
1212                         errcode = -1;
1213                 } else if (roundup(sublen, bus->blocksize) != dlen) {
1214                         brcmf_dbg(ERROR, "(superframe): len 0x%04x, rounded 0x%04x, expect 0x%04x\n",
1215                                   sublen, roundup(sublen, bus->blocksize),
1216                                   dlen);
1217                         errcode = -1;
1218                 } else if (SDPCM_PACKET_CHANNEL(&dptr[SDPCM_FRAMETAG_LEN]) !=
1219                            SDPCM_GLOM_CHANNEL) {
1220                         brcmf_dbg(ERROR, "(superframe): bad channel %d\n",
1221                                   SDPCM_PACKET_CHANNEL(
1222                                           &dptr[SDPCM_FRAMETAG_LEN]));
1223                         errcode = -1;
1224                 } else if (SDPCM_GLOMDESC(&dptr[SDPCM_FRAMETAG_LEN])) {
1225                         brcmf_dbg(ERROR, "(superframe): got 2nd descriptor?\n");
1226                         errcode = -1;
1227                 } else if ((doff < SDPCM_HDRLEN) ||
1228                            (doff > (pfirst->len - SDPCM_HDRLEN))) {
1229                         brcmf_dbg(ERROR, "(superframe): Bad data offset %d: HW %d pkt %d min %d\n",
1230                                   doff, sublen, pfirst->len, SDPCM_HDRLEN);
1231                         errcode = -1;
1232                 }
1233
1234                 /* Check sequence number of superframe SW header */
1235                 if (rxseq != seq) {
1236                         brcmf_dbg(INFO, "(superframe) rx_seq %d, expected %d\n",
1237                                   seq, rxseq);
1238                         bus->sdcnt.rx_badseq++;
1239                         rxseq = seq;
1240                 }
1241
1242                 /* Check window for sanity */
1243                 if ((u8) (txmax - bus->tx_seq) > 0x40) {
1244                         brcmf_dbg(ERROR, "unlikely tx max %d with tx_seq %d\n",
1245                                   txmax, bus->tx_seq);
1246                         txmax = bus->tx_seq + 2;
1247                 }
1248                 bus->tx_max = txmax;
1249
1250                 /* Remove superframe header, remember offset */
1251                 skb_pull(pfirst, doff);
1252                 sfdoff = doff;
1253                 num = 0;
1254
1255                 /* Validate all the subframe headers */
1256                 skb_queue_walk(&bus->glom, pnext) {
1257                         /* leave when invalid subframe is found */
1258                         if (errcode)
1259                                 break;
1260
1261                         dptr = (u8 *) (pnext->data);
1262                         dlen = (u16) (pnext->len);
1263                         sublen = get_unaligned_le16(dptr);
1264                         check = get_unaligned_le16(dptr + sizeof(u16));
1265                         chan = SDPCM_PACKET_CHANNEL(&dptr[SDPCM_FRAMETAG_LEN]);
1266                         doff = SDPCM_DOFFSET_VALUE(&dptr[SDPCM_FRAMETAG_LEN]);
1267                         brcmf_dbg_hex_dump(BRCMF_GLOM_ON(),
1268                                            dptr, 32, "subframe:\n");
1269
1270                         if ((u16)~(sublen ^ check)) {
1271                                 brcmf_dbg(ERROR, "(subframe %d): HW hdr error: len/check 0x%04x/0x%04x\n",
1272                                           num, sublen, check);
1273                                 errcode = -1;
1274                         } else if ((sublen > dlen) || (sublen < SDPCM_HDRLEN)) {
1275                                 brcmf_dbg(ERROR, "(subframe %d): length mismatch: len 0x%04x, expect 0x%04x\n",
1276                                           num, sublen, dlen);
1277                                 errcode = -1;
1278                         } else if ((chan != SDPCM_DATA_CHANNEL) &&
1279                                    (chan != SDPCM_EVENT_CHANNEL)) {
1280                                 brcmf_dbg(ERROR, "(subframe %d): bad channel %d\n",
1281                                           num, chan);
1282                                 errcode = -1;
1283                         } else if ((doff < SDPCM_HDRLEN) || (doff > sublen)) {
1284                                 brcmf_dbg(ERROR, "(subframe %d): Bad data offset %d: HW %d min %d\n",
1285                                           num, doff, sublen, SDPCM_HDRLEN);
1286                                 errcode = -1;
1287                         }
1288                         /* increase the subframe count */
1289                         num++;
1290                 }
1291
1292                 if (errcode) {
1293                         /* Terminate frame on error, request
1294                                  a couple retries */
1295                         if (bus->glomerr++ < 3) {
1296                                 /* Restore superframe header space */
1297                                 skb_push(pfirst, sfdoff);
1298                                 brcmf_sdbrcm_rxfail(bus, true, true);
1299                         } else {
1300                                 bus->glomerr = 0;
1301                                 brcmf_sdbrcm_rxfail(bus, true, false);
1302                                 bus->sdcnt.rxglomfail++;
1303                                 brcmf_sdbrcm_free_glom(bus);
1304                         }
1305                         bus->nextlen = 0;
1306                         return 0;
1307                 }
1308
1309                 /* Basic SD framing looks ok - process each packet (header) */
1310
1311                 skb_queue_walk_safe(&bus->glom, pfirst, pnext) {
1312                         dptr = (u8 *) (pfirst->data);
1313                         sublen = get_unaligned_le16(dptr);
1314                         chan = SDPCM_PACKET_CHANNEL(&dptr[SDPCM_FRAMETAG_LEN]);
1315                         seq = SDPCM_PACKET_SEQUENCE(&dptr[SDPCM_FRAMETAG_LEN]);
1316                         doff = SDPCM_DOFFSET_VALUE(&dptr[SDPCM_FRAMETAG_LEN]);
1317
1318                         brcmf_dbg(GLOM, "Get subframe %d, %p(%p/%d), sublen %d chan %d seq %d\n",
1319                                   num, pfirst, pfirst->data,
1320                                   pfirst->len, sublen, chan, seq);
1321
1322                         /* precondition: chan == SDPCM_DATA_CHANNEL ||
1323                                          chan == SDPCM_EVENT_CHANNEL */
1324
1325                         if (rxseq != seq) {
1326                                 brcmf_dbg(GLOM, "rx_seq %d, expected %d\n",
1327                                           seq, rxseq);
1328                                 bus->sdcnt.rx_badseq++;
1329                                 rxseq = seq;
1330                         }
1331                         rxseq++;
1332
1333                         brcmf_dbg_hex_dump(BRCMF_BYTES_ON() && BRCMF_DATA_ON(),
1334                                            dptr, dlen, "Rx Subframe Data:\n");
1335
1336                         __skb_trim(pfirst, sublen);
1337                         skb_pull(pfirst, doff);
1338
1339                         if (pfirst->len == 0) {
1340                                 skb_unlink(pfirst, &bus->glom);
1341                                 brcmu_pkt_buf_free_skb(pfirst);
1342                                 continue;
1343                         } else if (brcmf_proto_hdrpull(bus->sdiodev->dev,
1344                                                        &ifidx, pfirst) != 0) {
1345                                 brcmf_dbg(ERROR, "rx protocol error\n");
1346                                 bus->sdiodev->bus_if->dstats.rx_errors++;
1347                                 skb_unlink(pfirst, &bus->glom);
1348                                 brcmu_pkt_buf_free_skb(pfirst);
1349                                 continue;
1350                         }
1351
1352                         brcmf_dbg_hex_dump(BRCMF_GLOM_ON(),
1353                                            pfirst->data,
1354                                            min_t(int, pfirst->len, 32),
1355                                            "subframe %d to stack, %p (%p/%d) nxt/lnk %p/%p\n",
1356                                            bus->glom.qlen, pfirst, pfirst->data,
1357                                            pfirst->len, pfirst->next,
1358                                            pfirst->prev);
1359                 }
1360                 /* sent any remaining packets up */
1361                 if (bus->glom.qlen) {
1362                         up(&bus->sdsem);
1363                         brcmf_rx_frame(bus->sdiodev->dev, ifidx, &bus->glom);
1364                         down(&bus->sdsem);
1365                 }
1366
1367                 bus->sdcnt.rxglomframes++;
1368                 bus->sdcnt.rxglompkts += bus->glom.qlen;
1369         }
1370         return num;
1371 }
1372
1373 static int brcmf_sdbrcm_dcmd_resp_wait(struct brcmf_sdio *bus, uint *condition,
1374                                         bool *pending)
1375 {
1376         DECLARE_WAITQUEUE(wait, current);
1377         int timeout = msecs_to_jiffies(DCMD_RESP_TIMEOUT);
1378
1379         /* Wait until control frame is available */
1380         add_wait_queue(&bus->dcmd_resp_wait, &wait);
1381         set_current_state(TASK_INTERRUPTIBLE);
1382
1383         while (!(*condition) && (!signal_pending(current) && timeout))
1384                 timeout = schedule_timeout(timeout);
1385
1386         if (signal_pending(current))
1387                 *pending = true;
1388
1389         set_current_state(TASK_RUNNING);
1390         remove_wait_queue(&bus->dcmd_resp_wait, &wait);
1391
1392         return timeout;
1393 }
1394
1395 static int brcmf_sdbrcm_dcmd_resp_wake(struct brcmf_sdio *bus)
1396 {
1397         if (waitqueue_active(&bus->dcmd_resp_wait))
1398                 wake_up_interruptible(&bus->dcmd_resp_wait);
1399
1400         return 0;
1401 }
1402 static void
1403 brcmf_sdbrcm_read_control(struct brcmf_sdio *bus, u8 *hdr, uint len, uint doff)
1404 {
1405         uint rdlen, pad;
1406
1407         int sdret;
1408
1409         brcmf_dbg(TRACE, "Enter\n");
1410
1411         /* Set rxctl for frame (w/optional alignment) */
1412         bus->rxctl = bus->rxbuf;
1413         bus->rxctl += BRCMF_FIRSTREAD;
1414         pad = ((unsigned long)bus->rxctl % BRCMF_SDALIGN);
1415         if (pad)
1416                 bus->rxctl += (BRCMF_SDALIGN - pad);
1417         bus->rxctl -= BRCMF_FIRSTREAD;
1418
1419         /* Copy the already-read portion over */
1420         memcpy(bus->rxctl, hdr, BRCMF_FIRSTREAD);
1421         if (len <= BRCMF_FIRSTREAD)
1422                 goto gotpkt;
1423
1424         /* Raise rdlen to next SDIO block to avoid tail command */
1425         rdlen = len - BRCMF_FIRSTREAD;
1426         if (bus->roundup && bus->blocksize && (rdlen > bus->blocksize)) {
1427                 pad = bus->blocksize - (rdlen % bus->blocksize);
1428                 if ((pad <= bus->roundup) && (pad < bus->blocksize) &&
1429                     ((len + pad) < bus->sdiodev->bus_if->maxctl))
1430                         rdlen += pad;
1431         } else if (rdlen % BRCMF_SDALIGN) {
1432                 rdlen += BRCMF_SDALIGN - (rdlen % BRCMF_SDALIGN);
1433         }
1434
1435         /* Satisfy length-alignment requirements */
1436         if (rdlen & (ALIGNMENT - 1))
1437                 rdlen = roundup(rdlen, ALIGNMENT);
1438
1439         /* Drop if the read is too big or it exceeds our maximum */
1440         if ((rdlen + BRCMF_FIRSTREAD) > bus->sdiodev->bus_if->maxctl) {
1441                 brcmf_dbg(ERROR, "%d-byte control read exceeds %d-byte buffer\n",
1442                           rdlen, bus->sdiodev->bus_if->maxctl);
1443                 bus->sdiodev->bus_if->dstats.rx_errors++;
1444                 brcmf_sdbrcm_rxfail(bus, false, false);
1445                 goto done;
1446         }
1447
1448         if ((len - doff) > bus->sdiodev->bus_if->maxctl) {
1449                 brcmf_dbg(ERROR, "%d-byte ctl frame (%d-byte ctl data) exceeds %d-byte limit\n",
1450                           len, len - doff, bus->sdiodev->bus_if->maxctl);
1451                 bus->sdiodev->bus_if->dstats.rx_errors++;
1452                 bus->sdcnt.rx_toolong++;
1453                 brcmf_sdbrcm_rxfail(bus, false, false);
1454                 goto done;
1455         }
1456
1457         /* Read remainder of frame body into the rxctl buffer */
1458         sdret = brcmf_sdcard_recv_buf(bus->sdiodev,
1459                                 bus->sdiodev->sbwad,
1460                                 SDIO_FUNC_2,
1461                                 F2SYNC, (bus->rxctl + BRCMF_FIRSTREAD), rdlen);
1462         bus->sdcnt.f2rxdata++;
1463
1464         /* Control frame failures need retransmission */
1465         if (sdret < 0) {
1466                 brcmf_dbg(ERROR, "read %d control bytes failed: %d\n",
1467                           rdlen, sdret);
1468                 bus->sdcnt.rxc_errors++;
1469                 brcmf_sdbrcm_rxfail(bus, true, true);
1470                 goto done;
1471         }
1472
1473 gotpkt:
1474
1475         brcmf_dbg_hex_dump(BRCMF_BYTES_ON() && BRCMF_CTL_ON(),
1476                            bus->rxctl, len, "RxCtrl:\n");
1477
1478         /* Point to valid data and indicate its length */
1479         bus->rxctl += doff;
1480         bus->rxlen = len - doff;
1481
1482 done:
1483         /* Awake any waiters */
1484         brcmf_sdbrcm_dcmd_resp_wake(bus);
1485 }
1486
1487 /* Pad read to blocksize for efficiency */
1488 static void brcmf_pad(struct brcmf_sdio *bus, u16 *pad, u16 *rdlen)
1489 {
1490         if (bus->roundup && bus->blocksize && *rdlen > bus->blocksize) {
1491                 *pad = bus->blocksize - (*rdlen % bus->blocksize);
1492                 if (*pad <= bus->roundup && *pad < bus->blocksize &&
1493                     *rdlen + *pad + BRCMF_FIRSTREAD < MAX_RX_DATASZ)
1494                         *rdlen += *pad;
1495         } else if (*rdlen % BRCMF_SDALIGN) {
1496                 *rdlen += BRCMF_SDALIGN - (*rdlen % BRCMF_SDALIGN);
1497         }
1498 }
1499
1500 static void
1501 brcmf_alloc_pkt_and_read(struct brcmf_sdio *bus, u16 rdlen,
1502                          struct sk_buff **pkt, u8 **rxbuf)
1503 {
1504         int sdret;              /* Return code from calls */
1505
1506         *pkt = brcmu_pkt_buf_get_skb(rdlen + BRCMF_SDALIGN);
1507         if (*pkt == NULL)
1508                 return;
1509
1510         pkt_align(*pkt, rdlen, BRCMF_SDALIGN);
1511         *rxbuf = (u8 *) ((*pkt)->data);
1512         /* Read the entire frame */
1513         sdret = brcmf_sdcard_recv_pkt(bus->sdiodev, bus->sdiodev->sbwad,
1514                                       SDIO_FUNC_2, F2SYNC, *pkt);
1515         bus->sdcnt.f2rxdata++;
1516
1517         if (sdret < 0) {
1518                 brcmf_dbg(ERROR, "(nextlen): read %d bytes failed: %d\n",
1519                           rdlen, sdret);
1520                 brcmu_pkt_buf_free_skb(*pkt);
1521                 bus->sdiodev->bus_if->dstats.rx_errors++;
1522                 /* Force retry w/normal header read.
1523                  * Don't attempt NAK for
1524                  * gSPI
1525                  */
1526                 brcmf_sdbrcm_rxfail(bus, true, true);
1527                 *pkt = NULL;
1528         }
1529 }
1530
1531 /* Checks the header */
1532 static int
1533 brcmf_check_rxbuf(struct brcmf_sdio *bus, struct sk_buff *pkt, u8 *rxbuf,
1534                   u8 rxseq, u16 nextlen, u16 *len)
1535 {
1536         u16 check;
1537         bool len_consistent;    /* Result of comparing readahead len and
1538                                    len from hw-hdr */
1539
1540         memcpy(bus->rxhdr, rxbuf, SDPCM_HDRLEN);
1541
1542         /* Extract hardware header fields */
1543         *len = get_unaligned_le16(bus->rxhdr);
1544         check = get_unaligned_le16(bus->rxhdr + sizeof(u16));
1545
1546         /* All zeros means readahead info was bad */
1547         if (!(*len | check)) {
1548                 brcmf_dbg(INFO, "(nextlen): read zeros in HW header???\n");
1549                 goto fail;
1550         }
1551
1552         /* Validate check bytes */
1553         if ((u16)~(*len ^ check)) {
1554                 brcmf_dbg(ERROR, "(nextlen): HW hdr error: nextlen/len/check 0x%04x/0x%04x/0x%04x\n",
1555                           nextlen, *len, check);
1556                 bus->sdcnt.rx_badhdr++;
1557                 brcmf_sdbrcm_rxfail(bus, false, false);
1558                 goto fail;
1559         }
1560
1561         /* Validate frame length */
1562         if (*len < SDPCM_HDRLEN) {
1563                 brcmf_dbg(ERROR, "(nextlen): HW hdr length invalid: %d\n",
1564                           *len);
1565                 goto fail;
1566         }
1567
1568         /* Check for consistency with readahead info */
1569         len_consistent = (nextlen != (roundup(*len, 16) >> 4));
1570         if (len_consistent) {
1571                 /* Mismatch, force retry w/normal
1572                         header (may be >4K) */
1573                 brcmf_dbg(ERROR, "(nextlen): mismatch, nextlen %d len %d rnd %d; expected rxseq %d\n",
1574                           nextlen, *len, roundup(*len, 16),
1575                           rxseq);
1576                 brcmf_sdbrcm_rxfail(bus, true, true);
1577                 goto fail;
1578         }
1579
1580         return 0;
1581
1582 fail:
1583         brcmf_sdbrcm_pktfree2(bus, pkt);
1584         return -EINVAL;
1585 }
1586
1587 /* Return true if there may be more frames to read */
1588 static uint
1589 brcmf_sdbrcm_readframes(struct brcmf_sdio *bus, uint maxframes, bool *finished)
1590 {
1591         u16 len, check; /* Extracted hardware header fields */
1592         u8 chan, seq, doff;     /* Extracted software header fields */
1593         u8 fcbits;              /* Extracted fcbits from software header */
1594
1595         struct sk_buff *pkt;            /* Packet for event or data frames */
1596         u16 pad;                /* Number of pad bytes to read */
1597         u16 rdlen;              /* Total number of bytes to read */
1598         u8 rxseq;               /* Next sequence number to expect */
1599         uint rxleft = 0;        /* Remaining number of frames allowed */
1600         int sdret;              /* Return code from calls */
1601         u8 txmax;               /* Maximum tx sequence offered */
1602         u8 *rxbuf;
1603         int ifidx = 0;
1604         uint rxcount = 0;       /* Total frames read */
1605
1606         brcmf_dbg(TRACE, "Enter\n");
1607
1608         /* Not finished unless we encounter no more frames indication */
1609         *finished = false;
1610
1611         for (rxseq = bus->rx_seq, rxleft = maxframes;
1612              !bus->rxskip && rxleft &&
1613              bus->sdiodev->bus_if->state != BRCMF_BUS_DOWN;
1614              rxseq++, rxleft--) {
1615
1616                 /* Handle glomming separately */
1617                 if (bus->glomd || !skb_queue_empty(&bus->glom)) {
1618                         u8 cnt;
1619                         brcmf_dbg(GLOM, "calling rxglom: glomd %p, glom %p\n",
1620                                   bus->glomd, skb_peek(&bus->glom));
1621                         cnt = brcmf_sdbrcm_rxglom(bus, rxseq);
1622                         brcmf_dbg(GLOM, "rxglom returned %d\n", cnt);
1623                         rxseq += cnt - 1;
1624                         rxleft = (rxleft > cnt) ? (rxleft - cnt) : 1;
1625                         continue;
1626                 }
1627
1628                 /* Try doing single read if we can */
1629                 if (bus->nextlen) {
1630                         u16 nextlen = bus->nextlen;
1631                         bus->nextlen = 0;
1632
1633                         rdlen = len = nextlen << 4;
1634                         brcmf_pad(bus, &pad, &rdlen);
1635
1636                         /*
1637                          * After the frame is received we have to
1638                          * distinguish whether it is data
1639                          * or non-data frame.
1640                          */
1641                         brcmf_alloc_pkt_and_read(bus, rdlen, &pkt, &rxbuf);
1642                         if (pkt == NULL) {
1643                                 /* Give up on data, request rtx of events */
1644                                 brcmf_dbg(ERROR, "(nextlen): brcmf_alloc_pkt_and_read failed: len %d rdlen %d expected rxseq %d\n",
1645                                           len, rdlen, rxseq);
1646                                 continue;
1647                         }
1648
1649                         if (brcmf_check_rxbuf(bus, pkt, rxbuf, rxseq, nextlen,
1650                                               &len) < 0)
1651                                 continue;
1652
1653                         /* Extract software header fields */
1654                         chan = SDPCM_PACKET_CHANNEL(
1655                                         &bus->rxhdr[SDPCM_FRAMETAG_LEN]);
1656                         seq = SDPCM_PACKET_SEQUENCE(
1657                                         &bus->rxhdr[SDPCM_FRAMETAG_LEN]);
1658                         doff = SDPCM_DOFFSET_VALUE(
1659                                         &bus->rxhdr[SDPCM_FRAMETAG_LEN]);
1660                         txmax = SDPCM_WINDOW_VALUE(
1661                                         &bus->rxhdr[SDPCM_FRAMETAG_LEN]);
1662
1663                         bus->nextlen =
1664                             bus->rxhdr[SDPCM_FRAMETAG_LEN +
1665                                        SDPCM_NEXTLEN_OFFSET];
1666                         if ((bus->nextlen << 4) > MAX_RX_DATASZ) {
1667                                 brcmf_dbg(INFO, "(nextlen): got frame w/nextlen too large (%d), seq %d\n",
1668                                           bus->nextlen, seq);
1669                                 bus->nextlen = 0;
1670                         }
1671
1672                         bus->sdcnt.rx_readahead_cnt++;
1673
1674                         /* Handle Flow Control */
1675                         fcbits = SDPCM_FCMASK_VALUE(
1676                                         &bus->rxhdr[SDPCM_FRAMETAG_LEN]);
1677
1678                         if (bus->flowcontrol != fcbits) {
1679                                 if (~bus->flowcontrol & fcbits)
1680                                         bus->sdcnt.fc_xoff++;
1681
1682                                 if (bus->flowcontrol & ~fcbits)
1683                                         bus->sdcnt.fc_xon++;
1684
1685                                 bus->sdcnt.fc_rcvd++;
1686                                 bus->flowcontrol = fcbits;
1687                         }
1688
1689                         /* Check and update sequence number */
1690                         if (rxseq != seq) {
1691                                 brcmf_dbg(INFO, "(nextlen): rx_seq %d, expected %d\n",
1692                                           seq, rxseq);
1693                                 bus->sdcnt.rx_badseq++;
1694                                 rxseq = seq;
1695                         }
1696
1697                         /* Check window for sanity */
1698                         if ((u8) (txmax - bus->tx_seq) > 0x40) {
1699                                 brcmf_dbg(ERROR, "got unlikely tx max %d with tx_seq %d\n",
1700                                           txmax, bus->tx_seq);
1701                                 txmax = bus->tx_seq + 2;
1702                         }
1703                         bus->tx_max = txmax;
1704
1705                         brcmf_dbg_hex_dump(BRCMF_BYTES_ON() && BRCMF_DATA_ON(),
1706                                            rxbuf, len, "Rx Data:\n");
1707                         brcmf_dbg_hex_dump(!(BRCMF_BYTES_ON() &&
1708                                              BRCMF_DATA_ON()) &&
1709                                            BRCMF_HDRS_ON(),
1710                                            bus->rxhdr, SDPCM_HDRLEN,
1711                                            "RxHdr:\n");
1712
1713                         if (chan == SDPCM_CONTROL_CHANNEL) {
1714                                 brcmf_dbg(ERROR, "(nextlen): readahead on control packet %d?\n",
1715                                           seq);
1716                                 /* Force retry w/normal header read */
1717                                 bus->nextlen = 0;
1718                                 brcmf_sdbrcm_rxfail(bus, false, true);
1719                                 brcmf_sdbrcm_pktfree2(bus, pkt);
1720                                 continue;
1721                         }
1722
1723                         /* Validate data offset */
1724                         if ((doff < SDPCM_HDRLEN) || (doff > len)) {
1725                                 brcmf_dbg(ERROR, "(nextlen): bad data offset %d: HW len %d min %d\n",
1726                                           doff, len, SDPCM_HDRLEN);
1727                                 brcmf_sdbrcm_rxfail(bus, false, false);
1728                                 brcmf_sdbrcm_pktfree2(bus, pkt);
1729                                 continue;
1730                         }
1731
1732                         /* All done with this one -- now deliver the packet */
1733                         goto deliver;
1734                 }
1735
1736                 /* Read frame header (hardware and software) */
1737                 sdret = brcmf_sdcard_recv_buf(bus->sdiodev, bus->sdiodev->sbwad,
1738                                               SDIO_FUNC_2, F2SYNC, bus->rxhdr,
1739                                               BRCMF_FIRSTREAD);
1740                 bus->sdcnt.f2rxhdrs++;
1741
1742                 if (sdret < 0) {
1743                         brcmf_dbg(ERROR, "RXHEADER FAILED: %d\n", sdret);
1744                         bus->sdcnt.rx_hdrfail++;
1745                         brcmf_sdbrcm_rxfail(bus, true, true);
1746                         continue;
1747                 }
1748                 brcmf_dbg_hex_dump(BRCMF_BYTES_ON() || BRCMF_HDRS_ON(),
1749                                    bus->rxhdr, SDPCM_HDRLEN, "RxHdr:\n");
1750
1751
1752                 /* Extract hardware header fields */
1753                 len = get_unaligned_le16(bus->rxhdr);
1754                 check = get_unaligned_le16(bus->rxhdr + sizeof(u16));
1755
1756                 /* All zeros means no more frames */
1757                 if (!(len | check)) {
1758                         *finished = true;
1759                         break;
1760                 }
1761
1762                 /* Validate check bytes */
1763                 if ((u16) ~(len ^ check)) {
1764                         brcmf_dbg(ERROR, "HW hdr err: len/check 0x%04x/0x%04x\n",
1765                                   len, check);
1766                         bus->sdcnt.rx_badhdr++;
1767                         brcmf_sdbrcm_rxfail(bus, false, false);
1768                         continue;
1769                 }
1770
1771                 /* Validate frame length */
1772                 if (len < SDPCM_HDRLEN) {
1773                         brcmf_dbg(ERROR, "HW hdr length invalid: %d\n", len);
1774                         continue;
1775                 }
1776
1777                 /* Extract software header fields */
1778                 chan = SDPCM_PACKET_CHANNEL(&bus->rxhdr[SDPCM_FRAMETAG_LEN]);
1779                 seq = SDPCM_PACKET_SEQUENCE(&bus->rxhdr[SDPCM_FRAMETAG_LEN]);
1780                 doff = SDPCM_DOFFSET_VALUE(&bus->rxhdr[SDPCM_FRAMETAG_LEN]);
1781                 txmax = SDPCM_WINDOW_VALUE(&bus->rxhdr[SDPCM_FRAMETAG_LEN]);
1782
1783                 /* Validate data offset */
1784                 if ((doff < SDPCM_HDRLEN) || (doff > len)) {
1785                         brcmf_dbg(ERROR, "Bad data offset %d: HW len %d, min %d seq %d\n",
1786                                   doff, len, SDPCM_HDRLEN, seq);
1787                         bus->sdcnt.rx_badhdr++;
1788                         brcmf_sdbrcm_rxfail(bus, false, false);
1789                         continue;
1790                 }
1791
1792                 /* Save the readahead length if there is one */
1793                 bus->nextlen =
1794                     bus->rxhdr[SDPCM_FRAMETAG_LEN + SDPCM_NEXTLEN_OFFSET];
1795                 if ((bus->nextlen << 4) > MAX_RX_DATASZ) {
1796                         brcmf_dbg(INFO, "(nextlen): got frame w/nextlen too large (%d), seq %d\n",
1797                                   bus->nextlen, seq);
1798                         bus->nextlen = 0;
1799                 }
1800
1801                 /* Handle Flow Control */
1802                 fcbits = SDPCM_FCMASK_VALUE(&bus->rxhdr[SDPCM_FRAMETAG_LEN]);
1803
1804                 if (bus->flowcontrol != fcbits) {
1805                         if (~bus->flowcontrol & fcbits)
1806                                 bus->sdcnt.fc_xoff++;
1807
1808                         if (bus->flowcontrol & ~fcbits)
1809                                 bus->sdcnt.fc_xon++;
1810
1811                         bus->sdcnt.fc_rcvd++;
1812                         bus->flowcontrol = fcbits;
1813                 }
1814
1815                 /* Check and update sequence number */
1816                 if (rxseq != seq) {
1817                         brcmf_dbg(INFO, "rx_seq %d, expected %d\n", seq, rxseq);
1818                         bus->sdcnt.rx_badseq++;
1819                         rxseq = seq;
1820                 }
1821
1822                 /* Check window for sanity */
1823                 if ((u8) (txmax - bus->tx_seq) > 0x40) {
1824                         brcmf_dbg(ERROR, "unlikely tx max %d with tx_seq %d\n",
1825                                   txmax, bus->tx_seq);
1826                         txmax = bus->tx_seq + 2;
1827                 }
1828                 bus->tx_max = txmax;
1829
1830                 /* Call a separate function for control frames */
1831                 if (chan == SDPCM_CONTROL_CHANNEL) {
1832                         brcmf_sdbrcm_read_control(bus, bus->rxhdr, len, doff);
1833                         continue;
1834                 }
1835
1836                 /* precondition: chan is either SDPCM_DATA_CHANNEL,
1837                    SDPCM_EVENT_CHANNEL, SDPCM_TEST_CHANNEL or
1838                    SDPCM_GLOM_CHANNEL */
1839
1840                 /* Length to read */
1841                 rdlen = (len > BRCMF_FIRSTREAD) ? (len - BRCMF_FIRSTREAD) : 0;
1842
1843                 /* May pad read to blocksize for efficiency */
1844                 if (bus->roundup && bus->blocksize &&
1845                         (rdlen > bus->blocksize)) {
1846                         pad = bus->blocksize - (rdlen % bus->blocksize);
1847                         if ((pad <= bus->roundup) && (pad < bus->blocksize) &&
1848                             ((rdlen + pad + BRCMF_FIRSTREAD) < MAX_RX_DATASZ))
1849                                 rdlen += pad;
1850                 } else if (rdlen % BRCMF_SDALIGN) {
1851                         rdlen += BRCMF_SDALIGN - (rdlen % BRCMF_SDALIGN);
1852                 }
1853
1854                 /* Satisfy length-alignment requirements */
1855                 if (rdlen & (ALIGNMENT - 1))
1856                         rdlen = roundup(rdlen, ALIGNMENT);
1857
1858                 if ((rdlen + BRCMF_FIRSTREAD) > MAX_RX_DATASZ) {
1859                         /* Too long -- skip this frame */
1860                         brcmf_dbg(ERROR, "too long: len %d rdlen %d\n",
1861                                   len, rdlen);
1862                         bus->sdiodev->bus_if->dstats.rx_errors++;
1863                         bus->sdcnt.rx_toolong++;
1864                         brcmf_sdbrcm_rxfail(bus, false, false);
1865                         continue;
1866                 }
1867
1868                 pkt = brcmu_pkt_buf_get_skb(rdlen +
1869                                             BRCMF_FIRSTREAD + BRCMF_SDALIGN);
1870                 if (!pkt) {
1871                         /* Give up on data, request rtx of events */
1872                         brcmf_dbg(ERROR, "brcmu_pkt_buf_get_skb failed: rdlen %d chan %d\n",
1873                                   rdlen, chan);
1874                         bus->sdiodev->bus_if->dstats.rx_dropped++;
1875                         brcmf_sdbrcm_rxfail(bus, false, RETRYCHAN(chan));
1876                         continue;
1877                 }
1878
1879                 /* Leave room for what we already read, and align remainder */
1880                 skb_pull(pkt, BRCMF_FIRSTREAD);
1881                 pkt_align(pkt, rdlen, BRCMF_SDALIGN);
1882
1883                 /* Read the remaining frame data */
1884                 sdret = brcmf_sdcard_recv_pkt(bus->sdiodev, bus->sdiodev->sbwad,
1885                                               SDIO_FUNC_2, F2SYNC, pkt);
1886                 bus->sdcnt.f2rxdata++;
1887
1888                 if (sdret < 0) {
1889                         brcmf_dbg(ERROR, "read %d %s bytes failed: %d\n", rdlen,
1890                                   ((chan == SDPCM_EVENT_CHANNEL) ? "event"
1891                                    : ((chan == SDPCM_DATA_CHANNEL) ? "data"
1892                                       : "test")), sdret);
1893                         brcmu_pkt_buf_free_skb(pkt);
1894                         bus->sdiodev->bus_if->dstats.rx_errors++;
1895                         brcmf_sdbrcm_rxfail(bus, true, RETRYCHAN(chan));
1896                         continue;
1897                 }
1898
1899                 /* Copy the already-read portion */
1900                 skb_push(pkt, BRCMF_FIRSTREAD);
1901                 memcpy(pkt->data, bus->rxhdr, BRCMF_FIRSTREAD);
1902
1903                 brcmf_dbg_hex_dump(BRCMF_BYTES_ON() && BRCMF_DATA_ON(),
1904                                    pkt->data, len, "Rx Data:\n");
1905
1906 deliver:
1907                 /* Save superframe descriptor and allocate packet frame */
1908                 if (chan == SDPCM_GLOM_CHANNEL) {
1909                         if (SDPCM_GLOMDESC(&bus->rxhdr[SDPCM_FRAMETAG_LEN])) {
1910                                 brcmf_dbg(GLOM, "glom descriptor, %d bytes:\n",
1911                                           len);
1912                                 brcmf_dbg_hex_dump(BRCMF_GLOM_ON(),
1913                                                    pkt->data, len,
1914                                                    "Glom Data:\n");
1915                                 __skb_trim(pkt, len);
1916                                 skb_pull(pkt, SDPCM_HDRLEN);
1917                                 bus->glomd = pkt;
1918                         } else {
1919                                 brcmf_dbg(ERROR, "%s: glom superframe w/o "
1920                                           "descriptor!\n", __func__);
1921                                 brcmf_sdbrcm_rxfail(bus, false, false);
1922                         }
1923                         continue;
1924                 }
1925
1926                 /* Fill in packet len and prio, deliver upward */
1927                 __skb_trim(pkt, len);
1928                 skb_pull(pkt, doff);
1929
1930                 if (pkt->len == 0) {
1931                         brcmu_pkt_buf_free_skb(pkt);
1932                         continue;
1933                 } else if (brcmf_proto_hdrpull(bus->sdiodev->dev, &ifidx,
1934                            pkt) != 0) {
1935                         brcmf_dbg(ERROR, "rx protocol error\n");
1936                         brcmu_pkt_buf_free_skb(pkt);
1937                         bus->sdiodev->bus_if->dstats.rx_errors++;
1938                         continue;
1939                 }
1940
1941                 /* Unlock during rx call */
1942                 up(&bus->sdsem);
1943                 brcmf_rx_packet(bus->sdiodev->dev, ifidx, pkt);
1944                 down(&bus->sdsem);
1945         }
1946         rxcount = maxframes - rxleft;
1947         /* Message if we hit the limit */
1948         if (!rxleft)
1949                 brcmf_dbg(DATA, "hit rx limit of %d frames\n",
1950                           maxframes);
1951         else
1952                 brcmf_dbg(DATA, "processed %d frames\n", rxcount);
1953         /* Back off rxseq if awaiting rtx, update rx_seq */
1954         if (bus->rxskip)
1955                 rxseq--;
1956         bus->rx_seq = rxseq;
1957
1958         return rxcount;
1959 }
1960
1961 static void
1962 brcmf_sdbrcm_wait_for_event(struct brcmf_sdio *bus, bool *lockvar)
1963 {
1964         up(&bus->sdsem);
1965         wait_event_interruptible_timeout(bus->ctrl_wait, !*lockvar, HZ * 2);
1966         down(&bus->sdsem);
1967         return;
1968 }
1969
1970 static void
1971 brcmf_sdbrcm_wait_event_wakeup(struct brcmf_sdio *bus)
1972 {
1973         if (waitqueue_active(&bus->ctrl_wait))
1974                 wake_up_interruptible(&bus->ctrl_wait);
1975         return;
1976 }
1977
1978 /* Writes a HW/SW header into the packet and sends it. */
1979 /* Assumes: (a) header space already there, (b) caller holds lock */
1980 static int brcmf_sdbrcm_txpkt(struct brcmf_sdio *bus, struct sk_buff *pkt,
1981                               uint chan, bool free_pkt)
1982 {
1983         int ret;
1984         u8 *frame;
1985         u16 len, pad = 0;
1986         u32 swheader;
1987         struct sk_buff *new;
1988         int i;
1989
1990         brcmf_dbg(TRACE, "Enter\n");
1991
1992         frame = (u8 *) (pkt->data);
1993
1994         /* Add alignment padding, allocate new packet if needed */
1995         pad = ((unsigned long)frame % BRCMF_SDALIGN);
1996         if (pad) {
1997                 if (skb_headroom(pkt) < pad) {
1998                         brcmf_dbg(INFO, "insufficient headroom %d for %d pad\n",
1999                                   skb_headroom(pkt), pad);
2000                         bus->sdiodev->bus_if->tx_realloc++;
2001                         new = brcmu_pkt_buf_get_skb(pkt->len + BRCMF_SDALIGN);
2002                         if (!new) {
2003                                 brcmf_dbg(ERROR, "couldn't allocate new %d-byte packet\n",
2004                                           pkt->len + BRCMF_SDALIGN);
2005                                 ret = -ENOMEM;
2006                                 goto done;
2007                         }
2008
2009                         pkt_align(new, pkt->len, BRCMF_SDALIGN);
2010                         memcpy(new->data, pkt->data, pkt->len);
2011                         if (free_pkt)
2012                                 brcmu_pkt_buf_free_skb(pkt);
2013                         /* free the pkt if canned one is not used */
2014                         free_pkt = true;
2015                         pkt = new;
2016                         frame = (u8 *) (pkt->data);
2017                         /* precondition: (frame % BRCMF_SDALIGN) == 0) */
2018                         pad = 0;
2019                 } else {
2020                         skb_push(pkt, pad);
2021                         frame = (u8 *) (pkt->data);
2022                         /* precondition: pad + SDPCM_HDRLEN <= pkt->len */
2023                         memset(frame, 0, pad + SDPCM_HDRLEN);
2024                 }
2025         }
2026         /* precondition: pad < BRCMF_SDALIGN */
2027
2028         /* Hardware tag: 2 byte len followed by 2 byte ~len check (all LE) */
2029         len = (u16) (pkt->len);
2030         *(__le16 *) frame = cpu_to_le16(len);
2031         *(((__le16 *) frame) + 1) = cpu_to_le16(~len);
2032
2033         /* Software tag: channel, sequence number, data offset */
2034         swheader =
2035             ((chan << SDPCM_CHANNEL_SHIFT) & SDPCM_CHANNEL_MASK) | bus->tx_seq |
2036             (((pad +
2037                SDPCM_HDRLEN) << SDPCM_DOFFSET_SHIFT) & SDPCM_DOFFSET_MASK);
2038
2039         put_unaligned_le32(swheader, frame + SDPCM_FRAMETAG_LEN);
2040         put_unaligned_le32(0, frame + SDPCM_FRAMETAG_LEN + sizeof(swheader));
2041
2042 #ifdef DEBUG
2043         tx_packets[pkt->priority]++;
2044 #endif
2045
2046         brcmf_dbg_hex_dump(BRCMF_BYTES_ON() &&
2047                            ((BRCMF_CTL_ON() && chan == SDPCM_CONTROL_CHANNEL) ||
2048                             (BRCMF_DATA_ON() && chan != SDPCM_CONTROL_CHANNEL)),
2049                            frame, len, "Tx Frame:\n");
2050         brcmf_dbg_hex_dump(!(BRCMF_BYTES_ON() &&
2051                              ((BRCMF_CTL_ON() &&
2052                                chan == SDPCM_CONTROL_CHANNEL) ||
2053                               (BRCMF_DATA_ON() &&
2054                                chan != SDPCM_CONTROL_CHANNEL))) &&
2055                            BRCMF_HDRS_ON(),
2056                            frame, min_t(u16, len, 16), "TxHdr:\n");
2057
2058         /* Raise len to next SDIO block to eliminate tail command */
2059         if (bus->roundup && bus->blocksize && (len > bus->blocksize)) {
2060                 u16 pad = bus->blocksize - (len % bus->blocksize);
2061                 if ((pad <= bus->roundup) && (pad < bus->blocksize))
2062                                 len += pad;
2063         } else if (len % BRCMF_SDALIGN) {
2064                 len += BRCMF_SDALIGN - (len % BRCMF_SDALIGN);
2065         }
2066
2067         /* Some controllers have trouble with odd bytes -- round to even */
2068         if (len & (ALIGNMENT - 1))
2069                         len = roundup(len, ALIGNMENT);
2070
2071         ret = brcmf_sdcard_send_pkt(bus->sdiodev, bus->sdiodev->sbwad,
2072                                     SDIO_FUNC_2, F2SYNC, pkt);
2073         bus->sdcnt.f2txdata++;
2074
2075         if (ret < 0) {
2076                 /* On failure, abort the command and terminate the frame */
2077                 brcmf_dbg(INFO, "sdio error %d, abort command and terminate frame\n",
2078                           ret);
2079                 bus->sdcnt.tx_sderrs++;
2080
2081                 brcmf_sdcard_abort(bus->sdiodev, SDIO_FUNC_2);
2082                 brcmf_sdio_regwb(bus->sdiodev, SBSDIO_FUNC1_FRAMECTRL,
2083                                  SFC_WF_TERM, NULL);
2084                 bus->sdcnt.f1regdata++;
2085
2086                 for (i = 0; i < 3; i++) {
2087                         u8 hi, lo;
2088                         hi = brcmf_sdio_regrb(bus->sdiodev,
2089                                               SBSDIO_FUNC1_WFRAMEBCHI, NULL);
2090                         lo = brcmf_sdio_regrb(bus->sdiodev,
2091                                               SBSDIO_FUNC1_WFRAMEBCLO, NULL);
2092                         bus->sdcnt.f1regdata += 2;
2093                         if ((hi == 0) && (lo == 0))
2094                                 break;
2095                 }
2096
2097         }
2098         if (ret == 0)
2099                 bus->tx_seq = (bus->tx_seq + 1) % SDPCM_SEQUENCE_WRAP;
2100
2101 done:
2102         /* restore pkt buffer pointer before calling tx complete routine */
2103         skb_pull(pkt, SDPCM_HDRLEN + pad);
2104         up(&bus->sdsem);
2105         brcmf_txcomplete(bus->sdiodev->dev, pkt, ret != 0);
2106         down(&bus->sdsem);
2107
2108         if (free_pkt)
2109                 brcmu_pkt_buf_free_skb(pkt);
2110
2111         return ret;
2112 }
2113
2114 static uint brcmf_sdbrcm_sendfromq(struct brcmf_sdio *bus, uint maxframes)
2115 {
2116         struct sk_buff *pkt;
2117         u32 intstatus = 0;
2118         int ret = 0, prec_out;
2119         uint cnt = 0;
2120         uint datalen;
2121         u8 tx_prec_map;
2122
2123         brcmf_dbg(TRACE, "Enter\n");
2124
2125         tx_prec_map = ~bus->flowcontrol;
2126
2127         /* Send frames until the limit or some other event */
2128         for (cnt = 0; (cnt < maxframes) && data_ok(bus); cnt++) {
2129                 spin_lock_bh(&bus->txqlock);
2130                 pkt = brcmu_pktq_mdeq(&bus->txq, tx_prec_map, &prec_out);
2131                 if (pkt == NULL) {
2132                         spin_unlock_bh(&bus->txqlock);
2133                         break;
2134                 }
2135                 spin_unlock_bh(&bus->txqlock);
2136                 datalen = pkt->len - SDPCM_HDRLEN;
2137
2138                 ret = brcmf_sdbrcm_txpkt(bus, pkt, SDPCM_DATA_CHANNEL, true);
2139                 if (ret)
2140                         bus->sdiodev->bus_if->dstats.tx_errors++;
2141                 else
2142                         bus->sdiodev->bus_if->dstats.tx_bytes += datalen;
2143
2144                 /* In poll mode, need to check for other events */
2145                 if (!bus->intr && cnt) {
2146                         /* Check device status, signal pending interrupt */
2147                         ret = r_sdreg32(bus, &intstatus,
2148                                         offsetof(struct sdpcmd_regs,
2149                                                  intstatus));
2150                         bus->sdcnt.f2txdata++;
2151                         if (ret != 0)
2152                                 break;
2153                         if (intstatus & bus->hostintmask)
2154                                 bus->ipend = true;
2155                 }
2156         }
2157
2158         /* Deflow-control stack if needed */
2159         if (bus->sdiodev->bus_if->drvr_up &&
2160             (bus->sdiodev->bus_if->state == BRCMF_BUS_DATA) &&
2161             bus->txoff && (pktq_len(&bus->txq) < TXLOW)) {
2162                 bus->txoff = false;
2163                 brcmf_txflowblock(bus->sdiodev->dev, false);
2164         }
2165
2166         return cnt;
2167 }
2168
2169 static void brcmf_sdbrcm_bus_stop(struct device *dev)
2170 {
2171         u32 local_hostintmask;
2172         u8 saveclk;
2173         int err;
2174         struct brcmf_bus *bus_if = dev_get_drvdata(dev);
2175         struct brcmf_sdio_dev *sdiodev = bus_if->bus_priv.sdio;
2176         struct brcmf_sdio *bus = sdiodev->bus;
2177
2178         brcmf_dbg(TRACE, "Enter\n");
2179
2180         if (bus->watchdog_tsk) {
2181                 send_sig(SIGTERM, bus->watchdog_tsk, 1);
2182                 kthread_stop(bus->watchdog_tsk);
2183                 bus->watchdog_tsk = NULL;
2184         }
2185
2186         if (bus->dpc_tsk && bus->dpc_tsk != current) {
2187                 send_sig(SIGTERM, bus->dpc_tsk, 1);
2188                 kthread_stop(bus->dpc_tsk);
2189                 bus->dpc_tsk = NULL;
2190         }
2191
2192         down(&bus->sdsem);
2193
2194         /* Enable clock for device interrupts */
2195         brcmf_sdbrcm_clkctl(bus, CLK_AVAIL, false);
2196
2197         /* Disable and clear interrupts at the chip level also */
2198         w_sdreg32(bus, 0, offsetof(struct sdpcmd_regs, hostintmask));
2199         local_hostintmask = bus->hostintmask;
2200         bus->hostintmask = 0;
2201
2202         /* Change our idea of bus state */
2203         bus->sdiodev->bus_if->state = BRCMF_BUS_DOWN;
2204
2205         /* Force clocks on backplane to be sure F2 interrupt propagates */
2206         saveclk = brcmf_sdio_regrb(bus->sdiodev,
2207                                    SBSDIO_FUNC1_CHIPCLKCSR, &err);
2208         if (!err) {
2209                 brcmf_sdio_regwb(bus->sdiodev, SBSDIO_FUNC1_CHIPCLKCSR,
2210                                  (saveclk | SBSDIO_FORCE_HT), &err);
2211         }
2212         if (err)
2213                 brcmf_dbg(ERROR, "Failed to force clock for F2: err %d\n", err);
2214
2215         /* Turn off the bus (F2), free any pending packets */
2216         brcmf_dbg(INTR, "disable SDIO interrupts\n");
2217         brcmf_sdio_regwb(bus->sdiodev, SDIO_CCCR_IOEx, SDIO_FUNC_ENABLE_1,
2218                          NULL);
2219
2220         /* Clear any pending interrupts now that F2 is disabled */
2221         w_sdreg32(bus, local_hostintmask,
2222                   offsetof(struct sdpcmd_regs, intstatus));
2223
2224         /* Turn off the backplane clock (only) */
2225         brcmf_sdbrcm_clkctl(bus, CLK_SDONLY, false);
2226
2227         /* Clear the data packet queues */
2228         brcmu_pktq_flush(&bus->txq, true, NULL, NULL);
2229
2230         /* Clear any held glomming stuff */
2231         if (bus->glomd)
2232                 brcmu_pkt_buf_free_skb(bus->glomd);
2233         brcmf_sdbrcm_free_glom(bus);
2234
2235         /* Clear rx control and wake any waiters */
2236         bus->rxlen = 0;
2237         brcmf_sdbrcm_dcmd_resp_wake(bus);
2238
2239         /* Reset some F2 state stuff */
2240         bus->rxskip = false;
2241         bus->tx_seq = bus->rx_seq = 0;
2242
2243         up(&bus->sdsem);
2244 }
2245
2246 #ifdef CONFIG_BRCMFMAC_SDIO_OOB
2247 static inline void brcmf_sdbrcm_clrintr(struct brcmf_sdio *bus)
2248 {
2249         unsigned long flags;
2250
2251         spin_lock_irqsave(&bus->sdiodev->irq_en_lock, flags);
2252         if (!bus->sdiodev->irq_en && !bus->ipend) {
2253                 enable_irq(bus->sdiodev->irq);
2254                 bus->sdiodev->irq_en = true;
2255         }
2256         spin_unlock_irqrestore(&bus->sdiodev->irq_en_lock, flags);
2257 }
2258 #else
2259 static inline void brcmf_sdbrcm_clrintr(struct brcmf_sdio *bus)
2260 {
2261 }
2262 #endif          /* CONFIG_BRCMFMAC_SDIO_OOB */
2263
2264 static bool brcmf_sdbrcm_dpc(struct brcmf_sdio *bus)
2265 {
2266         u32 intstatus, newstatus = 0;
2267         uint rxlimit = bus->rxbound;    /* Rx frames to read before resched */
2268         uint txlimit = bus->txbound;    /* Tx frames to send before resched */
2269         uint framecnt = 0;      /* Temporary counter of tx/rx frames */
2270         bool rxdone = true;     /* Flag for no more read data */
2271         bool resched = false;   /* Flag indicating resched wanted */
2272         int err;
2273
2274         brcmf_dbg(TRACE, "Enter\n");
2275
2276         /* Start with leftover status bits */
2277         intstatus = bus->intstatus;
2278
2279         down(&bus->sdsem);
2280
2281         /* If waiting for HTAVAIL, check status */
2282         if (bus->clkstate == CLK_PENDING) {
2283                 u8 clkctl, devctl = 0;
2284
2285 #ifdef DEBUG
2286                 /* Check for inconsistent device control */
2287                 devctl = brcmf_sdio_regrb(bus->sdiodev,
2288                                           SBSDIO_DEVICE_CTL, &err);
2289                 if (err) {
2290                         brcmf_dbg(ERROR, "error reading DEVCTL: %d\n", err);
2291                         bus->sdiodev->bus_if->state = BRCMF_BUS_DOWN;
2292                 }
2293 #endif                          /* DEBUG */
2294
2295                 /* Read CSR, if clock on switch to AVAIL, else ignore */
2296                 clkctl = brcmf_sdio_regrb(bus->sdiodev,
2297                                           SBSDIO_FUNC1_CHIPCLKCSR, &err);
2298                 if (err) {
2299                         brcmf_dbg(ERROR, "error reading CSR: %d\n",
2300                                   err);
2301                         bus->sdiodev->bus_if->state = BRCMF_BUS_DOWN;
2302                 }
2303
2304                 brcmf_dbg(INFO, "DPC: PENDING, devctl 0x%02x clkctl 0x%02x\n",
2305                           devctl, clkctl);
2306
2307                 if (SBSDIO_HTAV(clkctl)) {
2308                         devctl = brcmf_sdio_regrb(bus->sdiodev,
2309                                                   SBSDIO_DEVICE_CTL, &err);
2310                         if (err) {
2311                                 brcmf_dbg(ERROR, "error reading DEVCTL: %d\n",
2312                                           err);
2313                                 bus->sdiodev->bus_if->state = BRCMF_BUS_DOWN;
2314                         }
2315                         devctl &= ~SBSDIO_DEVCTL_CA_INT_ONLY;
2316                         brcmf_sdio_regwb(bus->sdiodev, SBSDIO_DEVICE_CTL,
2317                                          devctl, &err);
2318                         if (err) {
2319                                 brcmf_dbg(ERROR, "error writing DEVCTL: %d\n",
2320                                           err);
2321                                 bus->sdiodev->bus_if->state = BRCMF_BUS_DOWN;
2322                         }
2323                         bus->clkstate = CLK_AVAIL;
2324                 } else {
2325                         goto clkwait;
2326                 }
2327         }
2328
2329         /* Make sure backplane clock is on */
2330         brcmf_sdbrcm_clkctl(bus, CLK_AVAIL, true);
2331         if (bus->clkstate == CLK_PENDING)
2332                 goto clkwait;
2333
2334         /* Pending interrupt indicates new device status */
2335         if (bus->ipend) {
2336                 bus->ipend = false;
2337                 err = r_sdreg32(bus, &newstatus,
2338                                 offsetof(struct sdpcmd_regs, intstatus));
2339                 bus->sdcnt.f1regdata++;
2340                 if (err != 0)
2341                         newstatus = 0;
2342                 newstatus &= bus->hostintmask;
2343                 bus->fcstate = !!(newstatus & I_HMB_FC_STATE);
2344                 if (newstatus) {
2345                         err = w_sdreg32(bus, newstatus,
2346                                         offsetof(struct sdpcmd_regs,
2347                                                  intstatus));
2348                         bus->sdcnt.f1regdata++;
2349                 }
2350         }
2351
2352         /* Merge new bits with previous */
2353         intstatus |= newstatus;
2354         bus->intstatus = 0;
2355
2356         /* Handle flow-control change: read new state in case our ack
2357          * crossed another change interrupt.  If change still set, assume
2358          * FC ON for safety, let next loop through do the debounce.
2359          */
2360         if (intstatus & I_HMB_FC_CHANGE) {
2361                 intstatus &= ~I_HMB_FC_CHANGE;
2362                 err = w_sdreg32(bus, I_HMB_FC_CHANGE,
2363                                 offsetof(struct sdpcmd_regs, intstatus));
2364
2365                 err = r_sdreg32(bus, &newstatus,
2366                                 offsetof(struct sdpcmd_regs, intstatus));
2367                 bus->sdcnt.f1regdata += 2;
2368                 bus->fcstate =
2369                     !!(newstatus & (I_HMB_FC_STATE | I_HMB_FC_CHANGE));
2370                 intstatus |= (newstatus & bus->hostintmask);
2371         }
2372
2373         /* Handle host mailbox indication */
2374         if (intstatus & I_HMB_HOST_INT) {
2375                 intstatus &= ~I_HMB_HOST_INT;
2376                 intstatus |= brcmf_sdbrcm_hostmail(bus);
2377         }
2378
2379         /* Generally don't ask for these, can get CRC errors... */
2380         if (intstatus & I_WR_OOSYNC) {
2381                 brcmf_dbg(ERROR, "Dongle reports WR_OOSYNC\n");
2382                 intstatus &= ~I_WR_OOSYNC;
2383         }
2384
2385         if (intstatus & I_RD_OOSYNC) {
2386                 brcmf_dbg(ERROR, "Dongle reports RD_OOSYNC\n");
2387                 intstatus &= ~I_RD_OOSYNC;
2388         }
2389
2390         if (intstatus & I_SBINT) {
2391                 brcmf_dbg(ERROR, "Dongle reports SBINT\n");
2392                 intstatus &= ~I_SBINT;
2393         }
2394
2395         /* Would be active due to wake-wlan in gSPI */
2396         if (intstatus & I_CHIPACTIVE) {
2397                 brcmf_dbg(INFO, "Dongle reports CHIPACTIVE\n");
2398                 intstatus &= ~I_CHIPACTIVE;
2399         }
2400
2401         /* Ignore frame indications if rxskip is set */
2402         if (bus->rxskip)
2403                 intstatus &= ~I_HMB_FRAME_IND;
2404
2405         /* On frame indication, read available frames */
2406         if (PKT_AVAILABLE()) {
2407                 framecnt = brcmf_sdbrcm_readframes(bus, rxlimit, &rxdone);
2408                 if (rxdone || bus->rxskip)
2409                         intstatus &= ~I_HMB_FRAME_IND;
2410                 rxlimit -= min(framecnt, rxlimit);
2411         }
2412
2413         /* Keep still-pending events for next scheduling */
2414         bus->intstatus = intstatus;
2415
2416 clkwait:
2417         brcmf_sdbrcm_clrintr(bus);
2418
2419         if (data_ok(bus) && bus->ctrl_frame_stat &&
2420                 (bus->clkstate == CLK_AVAIL)) {
2421                 int ret, i;
2422
2423                 ret = brcmf_sdcard_send_buf(bus->sdiodev, bus->sdiodev->sbwad,
2424                         SDIO_FUNC_2, F2SYNC, bus->ctrl_frame_buf,
2425                         (u32) bus->ctrl_frame_len);
2426
2427                 if (ret < 0) {
2428                         /* On failure, abort the command and
2429                                 terminate the frame */
2430                         brcmf_dbg(INFO, "sdio error %d, abort command and terminate frame\n",
2431                                   ret);
2432                         bus->sdcnt.tx_sderrs++;
2433
2434                         brcmf_sdcard_abort(bus->sdiodev, SDIO_FUNC_2);
2435
2436                         brcmf_sdio_regwb(bus->sdiodev, SBSDIO_FUNC1_FRAMECTRL,
2437                                          SFC_WF_TERM, &err);
2438                         bus->sdcnt.f1regdata++;
2439
2440                         for (i = 0; i < 3; i++) {
2441                                 u8 hi, lo;
2442                                 hi = brcmf_sdio_regrb(bus->sdiodev,
2443                                                       SBSDIO_FUNC1_WFRAMEBCHI,
2444                                                       &err);
2445                                 lo = brcmf_sdio_regrb(bus->sdiodev,
2446                                                       SBSDIO_FUNC1_WFRAMEBCLO,
2447                                                       &err);
2448                                 bus->sdcnt.f1regdata += 2;
2449                                 if ((hi == 0) && (lo == 0))
2450                                         break;
2451                         }
2452
2453                 }
2454                 if (ret == 0)
2455                         bus->tx_seq = (bus->tx_seq + 1) % SDPCM_SEQUENCE_WRAP;
2456
2457                 brcmf_dbg(INFO, "Return_dpc value is : %d\n", ret);
2458                 bus->ctrl_frame_stat = false;
2459                 brcmf_sdbrcm_wait_event_wakeup(bus);
2460         }
2461         /* Send queued frames (limit 1 if rx may still be pending) */
2462         else if ((bus->clkstate == CLK_AVAIL) && !bus->fcstate &&
2463                  brcmu_pktq_mlen(&bus->txq, ~bus->flowcontrol) && txlimit
2464                  && data_ok(bus)) {
2465                 framecnt = rxdone ? txlimit : min(txlimit, bus->txminmax);
2466                 framecnt = brcmf_sdbrcm_sendfromq(bus, framecnt);
2467                 txlimit -= framecnt;
2468         }
2469
2470         /* Resched if events or tx frames are pending,
2471                  else await next interrupt */
2472         /* On failed register access, all bets are off:
2473                  no resched or interrupts */
2474         if ((bus->sdiodev->bus_if->state == BRCMF_BUS_DOWN) || (err != 0)) {
2475                 brcmf_dbg(ERROR, "failed backplane access over SDIO, halting operation\n");
2476                 bus->sdiodev->bus_if->state = BRCMF_BUS_DOWN;
2477                 bus->intstatus = 0;
2478         } else if (bus->clkstate == CLK_PENDING) {
2479                 brcmf_dbg(INFO, "rescheduled due to CLK_PENDING awaiting I_CHIPACTIVE interrupt\n");
2480                 resched = true;
2481         } else if (bus->intstatus || bus->ipend ||
2482                 (!bus->fcstate && brcmu_pktq_mlen(&bus->txq, ~bus->flowcontrol)
2483                  && data_ok(bus)) || PKT_AVAILABLE()) {
2484                 resched = true;
2485         }
2486
2487         bus->dpc_sched = resched;
2488
2489         /* If we're done for now, turn off clock request. */
2490         if ((bus->clkstate != CLK_PENDING)
2491             && bus->idletime == BRCMF_IDLE_IMMEDIATE) {
2492                 bus->activity = false;
2493                 brcmf_sdbrcm_clkctl(bus, CLK_NONE, false);
2494         }
2495
2496         up(&bus->sdsem);
2497
2498         return resched;
2499 }
2500
2501 static inline void brcmf_sdbrcm_adddpctsk(struct brcmf_sdio *bus)
2502 {
2503         struct list_head *new_hd;
2504         unsigned long flags;
2505
2506         if (in_interrupt())
2507                 new_hd = kzalloc(sizeof(struct list_head), GFP_ATOMIC);
2508         else
2509                 new_hd = kzalloc(sizeof(struct list_head), GFP_KERNEL);
2510         if (new_hd == NULL)
2511                 return;
2512
2513         spin_lock_irqsave(&bus->dpc_tl_lock, flags);
2514         list_add_tail(new_hd, &bus->dpc_tsklst);
2515         spin_unlock_irqrestore(&bus->dpc_tl_lock, flags);
2516 }
2517
2518 static int brcmf_sdbrcm_dpc_thread(void *data)
2519 {
2520         struct brcmf_sdio *bus = (struct brcmf_sdio *) data;
2521         struct list_head *cur_hd, *tmp_hd;
2522         unsigned long flags;
2523
2524         allow_signal(SIGTERM);
2525         /* Run until signal received */
2526         while (1) {
2527                 if (kthread_should_stop())
2528                         break;
2529
2530                 if (list_empty(&bus->dpc_tsklst))
2531                         if (wait_for_completion_interruptible(&bus->dpc_wait))
2532                                 break;
2533
2534                 spin_lock_irqsave(&bus->dpc_tl_lock, flags);
2535                 list_for_each_safe(cur_hd, tmp_hd, &bus->dpc_tsklst) {
2536                         spin_unlock_irqrestore(&bus->dpc_tl_lock, flags);
2537
2538                         if (bus->sdiodev->bus_if->state == BRCMF_BUS_DOWN) {
2539                                 /* after stopping the bus, exit thread */
2540                                 brcmf_sdbrcm_bus_stop(bus->sdiodev->dev);
2541                                 bus->dpc_tsk = NULL;
2542                                 spin_lock_irqsave(&bus->dpc_tl_lock, flags);
2543                                 break;
2544                         }
2545
2546                         if (brcmf_sdbrcm_dpc(bus))
2547                                 brcmf_sdbrcm_adddpctsk(bus);
2548
2549                         spin_lock_irqsave(&bus->dpc_tl_lock, flags);
2550                         list_del(cur_hd);
2551                         kfree(cur_hd);
2552                 }
2553                 spin_unlock_irqrestore(&bus->dpc_tl_lock, flags);
2554         }
2555         return 0;
2556 }
2557
2558 static int brcmf_sdbrcm_bus_txdata(struct device *dev, struct sk_buff *pkt)
2559 {
2560         int ret = -EBADE;
2561         uint datalen, prec;
2562         struct brcmf_bus *bus_if = dev_get_drvdata(dev);
2563         struct brcmf_sdio_dev *sdiodev = bus_if->bus_priv.sdio;
2564         struct brcmf_sdio *bus = sdiodev->bus;
2565
2566         brcmf_dbg(TRACE, "Enter\n");
2567
2568         datalen = pkt->len;
2569
2570         /* Add space for the header */
2571         skb_push(pkt, SDPCM_HDRLEN);
2572         /* precondition: IS_ALIGNED((unsigned long)(pkt->data), 2) */
2573
2574         prec = prio2prec((pkt->priority & PRIOMASK));
2575
2576         /* Check for existing queue, current flow-control,
2577                          pending event, or pending clock */
2578         brcmf_dbg(TRACE, "deferring pktq len %d\n", pktq_len(&bus->txq));
2579         bus->sdcnt.fcqueued++;
2580
2581         /* Priority based enq */
2582         spin_lock_bh(&bus->txqlock);
2583         if (!brcmf_c_prec_enq(bus->sdiodev->dev, &bus->txq, pkt, prec)) {
2584                 skb_pull(pkt, SDPCM_HDRLEN);
2585                 brcmf_txcomplete(bus->sdiodev->dev, pkt, false);
2586                 brcmu_pkt_buf_free_skb(pkt);
2587                 brcmf_dbg(ERROR, "out of bus->txq !!!\n");
2588                 ret = -ENOSR;
2589         } else {
2590                 ret = 0;
2591         }
2592         spin_unlock_bh(&bus->txqlock);
2593
2594         if (pktq_len(&bus->txq) >= TXHI) {
2595                 bus->txoff = true;
2596                 brcmf_txflowblock(bus->sdiodev->dev, true);
2597         }
2598
2599 #ifdef DEBUG
2600         if (pktq_plen(&bus->txq, prec) > qcount[prec])
2601                 qcount[prec] = pktq_plen(&bus->txq, prec);
2602 #endif
2603         /* Schedule DPC if needed to send queued packet(s) */
2604         if (!bus->dpc_sched) {
2605                 bus->dpc_sched = true;
2606                 if (bus->dpc_tsk) {
2607                         brcmf_sdbrcm_adddpctsk(bus);
2608                         complete(&bus->dpc_wait);
2609                 }
2610         }
2611
2612         return ret;
2613 }
2614
2615 static int
2616 brcmf_sdbrcm_membytes(struct brcmf_sdio *bus, bool write, u32 address, u8 *data,
2617                  uint size)
2618 {
2619         int bcmerror = 0;
2620         u32 sdaddr;
2621         uint dsize;
2622
2623         /* Determine initial transfer parameters */
2624         sdaddr = address & SBSDIO_SB_OFT_ADDR_MASK;
2625         if ((sdaddr + size) & SBSDIO_SBWINDOW_MASK)
2626                 dsize = (SBSDIO_SB_OFT_ADDR_LIMIT - sdaddr);
2627         else
2628                 dsize = size;
2629
2630         /* Set the backplane window to include the start address */
2631         bcmerror = brcmf_sdcard_set_sbaddr_window(bus->sdiodev, address);
2632         if (bcmerror) {
2633                 brcmf_dbg(ERROR, "window change failed\n");
2634                 goto xfer_done;
2635         }
2636
2637         /* Do the transfer(s) */
2638         while (size) {
2639                 brcmf_dbg(INFO, "%s %d bytes at offset 0x%08x in window 0x%08x\n",
2640                           write ? "write" : "read", dsize,
2641                           sdaddr, address & SBSDIO_SBWINDOW_MASK);
2642                 bcmerror = brcmf_sdcard_rwdata(bus->sdiodev, write,
2643                                                sdaddr, data, dsize);
2644                 if (bcmerror) {
2645                         brcmf_dbg(ERROR, "membytes transfer failed\n");
2646                         break;
2647                 }
2648
2649                 /* Adjust for next transfer (if any) */
2650                 size -= dsize;
2651                 if (size) {
2652                         data += dsize;
2653                         address += dsize;
2654                         bcmerror = brcmf_sdcard_set_sbaddr_window(bus->sdiodev,
2655                                                                   address);
2656                         if (bcmerror) {
2657                                 brcmf_dbg(ERROR, "window change failed\n");
2658                                 break;
2659                         }
2660                         sdaddr = 0;
2661                         dsize = min_t(uint, SBSDIO_SB_OFT_ADDR_LIMIT, size);
2662                 }
2663         }
2664
2665 xfer_done:
2666         /* Return the window to backplane enumeration space for core access */
2667         if (brcmf_sdcard_set_sbaddr_window(bus->sdiodev, bus->sdiodev->sbwad))
2668                 brcmf_dbg(ERROR, "FAILED to set window back to 0x%x\n",
2669                           bus->sdiodev->sbwad);
2670
2671         return bcmerror;
2672 }
2673
2674 #ifdef DEBUG
2675 #define CONSOLE_LINE_MAX        192
2676
2677 static int brcmf_sdbrcm_readconsole(struct brcmf_sdio *bus)
2678 {
2679         struct brcmf_console *c = &bus->console;
2680         u8 line[CONSOLE_LINE_MAX], ch;
2681         u32 n, idx, addr;
2682         int rv;
2683
2684         /* Don't do anything until FWREADY updates console address */
2685         if (bus->console_addr == 0)
2686                 return 0;
2687
2688         /* Read console log struct */
2689         addr = bus->console_addr + offsetof(struct rte_console, log_le);
2690         rv = brcmf_sdbrcm_membytes(bus, false, addr, (u8 *)&c->log_le,
2691                                    sizeof(c->log_le));
2692         if (rv < 0)
2693                 return rv;
2694
2695         /* Allocate console buffer (one time only) */
2696         if (c->buf == NULL) {
2697                 c->bufsize = le32_to_cpu(c->log_le.buf_size);
2698                 c->buf = kmalloc(c->bufsize, GFP_ATOMIC);
2699                 if (c->buf == NULL)
2700                         return -ENOMEM;
2701         }
2702
2703         idx = le32_to_cpu(c->log_le.idx);
2704
2705         /* Protect against corrupt value */
2706         if (idx > c->bufsize)
2707                 return -EBADE;
2708
2709         /* Skip reading the console buffer if the index pointer
2710          has not moved */
2711         if (idx == c->last)
2712                 return 0;
2713
2714         /* Read the console buffer */
2715         addr = le32_to_cpu(c->log_le.buf);
2716         rv = brcmf_sdbrcm_membytes(bus, false, addr, c->buf, c->bufsize);
2717         if (rv < 0)
2718                 return rv;
2719
2720         while (c->last != idx) {
2721                 for (n = 0; n < CONSOLE_LINE_MAX - 2; n++) {
2722                         if (c->last == idx) {
2723                                 /* This would output a partial line.
2724                                  * Instead, back up
2725                                  * the buffer pointer and output this
2726                                  * line next time around.
2727                                  */
2728                                 if (c->last >= n)
2729                                         c->last -= n;
2730                                 else
2731                                         c->last = c->bufsize - n;
2732                                 goto break2;
2733                         }
2734                         ch = c->buf[c->last];
2735                         c->last = (c->last + 1) % c->bufsize;
2736                         if (ch == '\n')
2737                                 break;
2738                         line[n] = ch;
2739                 }
2740
2741                 if (n > 0) {
2742                         if (line[n - 1] == '\r')
2743                                 n--;
2744                         line[n] = 0;
2745                         pr_debug("CONSOLE: %s\n", line);
2746                 }
2747         }
2748 break2:
2749
2750         return 0;
2751 }
2752 #endif                          /* DEBUG */
2753
2754 static int brcmf_tx_frame(struct brcmf_sdio *bus, u8 *frame, u16 len)
2755 {
2756         int i;
2757         int ret;
2758
2759         bus->ctrl_frame_stat = false;
2760         ret = brcmf_sdcard_send_buf(bus->sdiodev, bus->sdiodev->sbwad,
2761                                     SDIO_FUNC_2, F2SYNC, frame, len);
2762
2763         if (ret < 0) {
2764                 /* On failure, abort the command and terminate the frame */
2765                 brcmf_dbg(INFO, "sdio error %d, abort command and terminate frame\n",
2766                           ret);
2767                 bus->sdcnt.tx_sderrs++;
2768
2769                 brcmf_sdcard_abort(bus->sdiodev, SDIO_FUNC_2);
2770
2771                 brcmf_sdio_regwb(bus->sdiodev, SBSDIO_FUNC1_FRAMECTRL,
2772                                  SFC_WF_TERM, NULL);
2773                 bus->sdcnt.f1regdata++;
2774
2775                 for (i = 0; i < 3; i++) {
2776                         u8 hi, lo;
2777                         hi = brcmf_sdio_regrb(bus->sdiodev,
2778                                               SBSDIO_FUNC1_WFRAMEBCHI, NULL);
2779                         lo = brcmf_sdio_regrb(bus->sdiodev,
2780                                               SBSDIO_FUNC1_WFRAMEBCLO, NULL);
2781                         bus->sdcnt.f1regdata += 2;
2782                         if (hi == 0 && lo == 0)
2783                                 break;
2784                 }
2785                 return ret;
2786         }
2787
2788         bus->tx_seq = (bus->tx_seq + 1) % SDPCM_SEQUENCE_WRAP;
2789
2790         return ret;
2791 }
2792
2793 static int
2794 brcmf_sdbrcm_bus_txctl(struct device *dev, unsigned char *msg, uint msglen)
2795 {
2796         u8 *frame;
2797         u16 len;
2798         u32 swheader;
2799         uint retries = 0;
2800         u8 doff = 0;
2801         int ret = -1;
2802         struct brcmf_bus *bus_if = dev_get_drvdata(dev);
2803         struct brcmf_sdio_dev *sdiodev = bus_if->bus_priv.sdio;
2804         struct brcmf_sdio *bus = sdiodev->bus;
2805
2806         brcmf_dbg(TRACE, "Enter\n");
2807
2808         /* Back the pointer to make a room for bus header */
2809         frame = msg - SDPCM_HDRLEN;
2810         len = (msglen += SDPCM_HDRLEN);
2811
2812         /* Add alignment padding (optional for ctl frames) */
2813         doff = ((unsigned long)frame % BRCMF_SDALIGN);
2814         if (doff) {
2815                 frame -= doff;
2816                 len += doff;
2817                 msglen += doff;
2818                 memset(frame, 0, doff + SDPCM_HDRLEN);
2819         }
2820         /* precondition: doff < BRCMF_SDALIGN */
2821         doff += SDPCM_HDRLEN;
2822
2823         /* Round send length to next SDIO block */
2824         if (bus->roundup && bus->blocksize && (len > bus->blocksize)) {
2825                 u16 pad = bus->blocksize - (len % bus->blocksize);
2826                 if ((pad <= bus->roundup) && (pad < bus->blocksize))
2827                         len += pad;
2828         } else if (len % BRCMF_SDALIGN) {
2829                 len += BRCMF_SDALIGN - (len % BRCMF_SDALIGN);
2830         }
2831
2832         /* Satisfy length-alignment requirements */
2833         if (len & (ALIGNMENT - 1))
2834                 len = roundup(len, ALIGNMENT);
2835
2836         /* precondition: IS_ALIGNED((unsigned long)frame, 2) */
2837
2838         /* Need to lock here to protect txseq and SDIO tx calls */
2839         down(&bus->sdsem);
2840
2841         /* Make sure backplane clock is on */
2842         brcmf_sdbrcm_clkctl(bus, CLK_AVAIL, false);
2843
2844         /* Hardware tag: 2 byte len followed by 2 byte ~len check (all LE) */
2845         *(__le16 *) frame = cpu_to_le16((u16) msglen);
2846         *(((__le16 *) frame) + 1) = cpu_to_le16(~msglen);
2847
2848         /* Software tag: channel, sequence number, data offset */
2849         swheader =
2850             ((SDPCM_CONTROL_CHANNEL << SDPCM_CHANNEL_SHIFT) &
2851              SDPCM_CHANNEL_MASK)
2852             | bus->tx_seq | ((doff << SDPCM_DOFFSET_SHIFT) &
2853                              SDPCM_DOFFSET_MASK);
2854         put_unaligned_le32(swheader, frame + SDPCM_FRAMETAG_LEN);
2855         put_unaligned_le32(0, frame + SDPCM_FRAMETAG_LEN + sizeof(swheader));
2856
2857         if (!data_ok(bus)) {
2858                 brcmf_dbg(INFO, "No bus credit bus->tx_max %d, bus->tx_seq %d\n",
2859                           bus->tx_max, bus->tx_seq);
2860                 bus->ctrl_frame_stat = true;
2861                 /* Send from dpc */
2862                 bus->ctrl_frame_buf = frame;
2863                 bus->ctrl_frame_len = len;
2864
2865                 brcmf_sdbrcm_wait_for_event(bus, &bus->ctrl_frame_stat);
2866
2867                 if (!bus->ctrl_frame_stat) {
2868                         brcmf_dbg(INFO, "ctrl_frame_stat == false\n");
2869                         ret = 0;
2870                 } else {
2871                         brcmf_dbg(INFO, "ctrl_frame_stat == true\n");
2872                         ret = -1;
2873                 }
2874         }
2875
2876         if (ret == -1) {
2877                 brcmf_dbg_hex_dump(BRCMF_BYTES_ON() && BRCMF_CTL_ON(),
2878                                    frame, len, "Tx Frame:\n");
2879                 brcmf_dbg_hex_dump(!(BRCMF_BYTES_ON() && BRCMF_CTL_ON()) &&
2880                                    BRCMF_HDRS_ON(),
2881                                    frame, min_t(u16, len, 16), "TxHdr:\n");
2882
2883                 do {
2884                         ret = brcmf_tx_frame(bus, frame, len);
2885                 } while (ret < 0 && retries++ < TXRETRIES);
2886         }
2887
2888         if ((bus->idletime == BRCMF_IDLE_IMMEDIATE) && !bus->dpc_sched) {
2889                 bus->activity = false;
2890                 brcmf_sdbrcm_clkctl(bus, CLK_NONE, true);
2891         }
2892
2893         up(&bus->sdsem);
2894
2895         if (ret)
2896                 bus->sdcnt.tx_ctlerrs++;
2897         else
2898                 bus->sdcnt.tx_ctlpkts++;
2899
2900         return ret ? -EIO : 0;
2901 }
2902
2903 #ifdef DEBUG
2904 static inline bool brcmf_sdio_valid_shared_address(u32 addr)
2905 {
2906         return !(addr == 0 || ((~addr >> 16) & 0xffff) == (addr & 0xffff));
2907 }
2908
2909 static int brcmf_sdio_readshared(struct brcmf_sdio *bus,
2910                                  struct sdpcm_shared *sh)
2911 {
2912         u32 addr;
2913         int rv;
2914         u32 shaddr = 0;
2915         struct sdpcm_shared_le sh_le;
2916         __le32 addr_le;
2917
2918         shaddr = bus->ramsize - 4;
2919
2920         /*
2921          * Read last word in socram to determine
2922          * address of sdpcm_shared structure
2923          */
2924         rv = brcmf_sdbrcm_membytes(bus, false, shaddr,
2925                                    (u8 *)&addr_le, 4);
2926         if (rv < 0)
2927                 return rv;
2928
2929         addr = le32_to_cpu(addr_le);
2930
2931         brcmf_dbg(INFO, "sdpcm_shared address 0x%08X\n", addr);
2932
2933         /*
2934          * Check if addr is valid.
2935          * NVRAM length at the end of memory should have been overwritten.
2936          */
2937         if (!brcmf_sdio_valid_shared_address(addr)) {
2938                         brcmf_dbg(ERROR, "invalid sdpcm_shared address 0x%08X\n",
2939                                   addr);
2940                         return -EINVAL;
2941         }
2942
2943         /* Read hndrte_shared structure */
2944         rv = brcmf_sdbrcm_membytes(bus, false, addr, (u8 *)&sh_le,
2945                                    sizeof(struct sdpcm_shared_le));
2946         if (rv < 0)
2947                 return rv;
2948
2949         /* Endianness */
2950         sh->flags = le32_to_cpu(sh_le.flags);
2951         sh->trap_addr = le32_to_cpu(sh_le.trap_addr);
2952         sh->assert_exp_addr = le32_to_cpu(sh_le.assert_exp_addr);
2953         sh->assert_file_addr = le32_to_cpu(sh_le.assert_file_addr);
2954         sh->assert_line = le32_to_cpu(sh_le.assert_line);
2955         sh->console_addr = le32_to_cpu(sh_le.console_addr);
2956         sh->msgtrace_addr = le32_to_cpu(sh_le.msgtrace_addr);
2957
2958         if ((sh->flags & SDPCM_SHARED_VERSION_MASK) != SDPCM_SHARED_VERSION) {
2959                 brcmf_dbg(ERROR,
2960                           "sdpcm_shared version mismatch: dhd %d dongle %d\n",
2961                           SDPCM_SHARED_VERSION,
2962                           sh->flags & SDPCM_SHARED_VERSION_MASK);
2963                 return -EPROTO;
2964         }
2965
2966         return 0;
2967 }
2968
2969 static int brcmf_sdio_dump_console(struct brcmf_sdio *bus,
2970                                    struct sdpcm_shared *sh, char __user *data,
2971                                    size_t count)
2972 {
2973         u32 addr, console_ptr, console_size, console_index;
2974         char *conbuf = NULL;
2975         __le32 sh_val;
2976         int rv;
2977         loff_t pos = 0;
2978         int nbytes = 0;
2979
2980         /* obtain console information from device memory */
2981         addr = sh->console_addr + offsetof(struct rte_console, log_le);
2982         rv = brcmf_sdbrcm_membytes(bus, false, addr,
2983                         (u8 *)&sh_val, sizeof(u32));
2984         if (rv < 0)
2985                 return rv;
2986         console_ptr = le32_to_cpu(sh_val);
2987
2988         addr = sh->console_addr + offsetof(struct rte_console, log_le.buf_size);
2989         rv = brcmf_sdbrcm_membytes(bus, false, addr,
2990                         (u8 *)&sh_val, sizeof(u32));
2991         if (rv < 0)
2992                 return rv;
2993         console_size = le32_to_cpu(sh_val);
2994
2995         addr = sh->console_addr + offsetof(struct rte_console, log_le.idx);
2996         rv = brcmf_sdbrcm_membytes(bus, false, addr,
2997                         (u8 *)&sh_val, sizeof(u32));
2998         if (rv < 0)
2999                 return rv;
3000         console_index = le32_to_cpu(sh_val);
3001
3002         /* allocate buffer for console data */
3003         if (console_size <= CONSOLE_BUFFER_MAX)
3004                 conbuf = vzalloc(console_size+1);
3005
3006         if (!conbuf)
3007                 return -ENOMEM;
3008
3009         /* obtain the console data from device */
3010         conbuf[console_size] = '\0';
3011         rv = brcmf_sdbrcm_membytes(bus, false, console_ptr, (u8 *)conbuf,
3012                                    console_size);
3013         if (rv < 0)
3014                 goto done;
3015
3016         rv = simple_read_from_buffer(data, count, &pos,
3017                                      conbuf + console_index,
3018                                      console_size - console_index);
3019         if (rv < 0)
3020                 goto done;
3021
3022         nbytes = rv;
3023         if (console_index > 0) {
3024                 pos = 0;
3025                 rv = simple_read_from_buffer(data+nbytes, count, &pos,
3026                                              conbuf, console_index - 1);
3027                 if (rv < 0)
3028                         goto done;
3029                 rv += nbytes;
3030         }
3031 done:
3032         vfree(conbuf);
3033         return rv;
3034 }
3035
3036 static int brcmf_sdio_trap_info(struct brcmf_sdio *bus, struct sdpcm_shared *sh,
3037                                 char __user *data, size_t count)
3038 {
3039         int error, res;
3040         char buf[350];
3041         struct brcmf_trap_info tr;
3042         int nbytes;
3043         loff_t pos = 0;
3044
3045         if ((sh->flags & SDPCM_SHARED_TRAP) == 0)
3046                 return 0;
3047
3048         error = brcmf_sdbrcm_membytes(bus, false, sh->trap_addr, (u8 *)&tr,
3049                                       sizeof(struct brcmf_trap_info));
3050         if (error < 0)
3051                 return error;
3052
3053         nbytes = brcmf_sdio_dump_console(bus, sh, data, count);
3054         if (nbytes < 0)
3055                 return nbytes;
3056
3057         res = scnprintf(buf, sizeof(buf),
3058                         "dongle trap info: type 0x%x @ epc 0x%08x\n"
3059                         "  cpsr 0x%08x spsr 0x%08x sp 0x%08x\n"
3060                         "  lr   0x%08x pc   0x%08x offset 0x%x\n"
3061                         "  r0   0x%08x r1   0x%08x r2 0x%08x r3 0x%08x\n"
3062                         "  r4   0x%08x r5   0x%08x r6 0x%08x r7 0x%08x\n",
3063                         le32_to_cpu(tr.type), le32_to_cpu(tr.epc),
3064                         le32_to_cpu(tr.cpsr), le32_to_cpu(tr.spsr),
3065                         le32_to_cpu(tr.r13), le32_to_cpu(tr.r14),
3066                         le32_to_cpu(tr.pc), sh->trap_addr,
3067                         le32_to_cpu(tr.r0), le32_to_cpu(tr.r1),
3068                         le32_to_cpu(tr.r2), le32_to_cpu(tr.r3),
3069                         le32_to_cpu(tr.r4), le32_to_cpu(tr.r5),
3070                         le32_to_cpu(tr.r6), le32_to_cpu(tr.r7));
3071
3072         error = simple_read_from_buffer(data+nbytes, count, &pos, buf, res);
3073         if (error < 0)
3074                 return error;
3075
3076         nbytes += error;
3077         return nbytes;
3078 }
3079
3080 static int brcmf_sdio_assert_info(struct brcmf_sdio *bus,
3081                                   struct sdpcm_shared *sh, char __user *data,
3082                                   size_t count)
3083 {
3084         int error = 0;
3085         char buf[200];
3086         char file[80] = "?";
3087         char expr[80] = "<???>";
3088         int res;
3089         loff_t pos = 0;
3090
3091         if ((sh->flags & SDPCM_SHARED_ASSERT_BUILT) == 0) {
3092                 brcmf_dbg(INFO, "firmware not built with -assert\n");
3093                 return 0;
3094         } else if ((sh->flags & SDPCM_SHARED_ASSERT) == 0) {
3095                 brcmf_dbg(INFO, "no assert in dongle\n");
3096                 return 0;
3097         }
3098
3099         if (sh->assert_file_addr != 0) {
3100                 error = brcmf_sdbrcm_membytes(bus, false, sh->assert_file_addr,
3101                                               (u8 *)file, 80);
3102                 if (error < 0)
3103                         return error;
3104         }
3105         if (sh->assert_exp_addr != 0) {
3106                 error = brcmf_sdbrcm_membytes(bus, false, sh->assert_exp_addr,
3107                                               (u8 *)expr, 80);
3108                 if (error < 0)
3109                         return error;
3110         }
3111
3112         res = scnprintf(buf, sizeof(buf),
3113                         "dongle assert: %s:%d: assert(%s)\n",
3114                         file, sh->assert_line, expr);
3115         return simple_read_from_buffer(data, count, &pos, buf, res);
3116 }
3117
3118 static int brcmf_sdbrcm_checkdied(struct brcmf_sdio *bus)
3119 {
3120         int error;
3121         struct sdpcm_shared sh;
3122
3123         down(&bus->sdsem);
3124         error = brcmf_sdio_readshared(bus, &sh);
3125         up(&bus->sdsem);
3126
3127         if (error < 0)
3128                 return error;
3129
3130         if ((sh.flags & SDPCM_SHARED_ASSERT_BUILT) == 0)
3131                 brcmf_dbg(INFO, "firmware not built with -assert\n");
3132         else if (sh.flags & SDPCM_SHARED_ASSERT)
3133                 brcmf_dbg(ERROR, "assertion in dongle\n");
3134
3135         if (sh.flags & SDPCM_SHARED_TRAP)
3136                 brcmf_dbg(ERROR, "firmware trap in dongle\n");
3137
3138         return 0;
3139 }
3140
3141 static int brcmf_sdbrcm_died_dump(struct brcmf_sdio *bus, char __user *data,
3142                                   size_t count, loff_t *ppos)
3143 {
3144         int error = 0;
3145         struct sdpcm_shared sh;
3146         int nbytes = 0;
3147         loff_t pos = *ppos;
3148
3149         if (pos != 0)
3150                 return 0;
3151
3152         down(&bus->sdsem);
3153         error = brcmf_sdio_readshared(bus, &sh);
3154         if (error < 0)
3155                 goto done;
3156
3157         error = brcmf_sdio_assert_info(bus, &sh, data, count);
3158         if (error < 0)
3159                 goto done;
3160
3161         nbytes = error;
3162         error = brcmf_sdio_trap_info(bus, &sh, data, count);
3163         if (error < 0)
3164                 goto done;
3165
3166         error += nbytes;
3167         *ppos += error;
3168 done:
3169         up(&bus->sdsem);
3170         return error;
3171 }
3172
3173 static ssize_t brcmf_sdio_forensic_read(struct file *f, char __user *data,
3174                                         size_t count, loff_t *ppos)
3175 {
3176         struct brcmf_sdio *bus = f->private_data;
3177         int res;
3178
3179         res = brcmf_sdbrcm_died_dump(bus, data, count, ppos);
3180         if (res > 0)
3181                 *ppos += res;
3182         return (ssize_t)res;
3183 }
3184
3185 static const struct file_operations brcmf_sdio_forensic_ops = {
3186         .owner = THIS_MODULE,
3187         .open = simple_open,
3188         .read = brcmf_sdio_forensic_read
3189 };
3190
3191 static void brcmf_sdio_debugfs_create(struct brcmf_sdio *bus)
3192 {
3193         struct brcmf_pub *drvr = bus->sdiodev->bus_if->drvr;
3194         struct dentry *dentry = brcmf_debugfs_get_devdir(drvr);
3195
3196         if (IS_ERR_OR_NULL(dentry))
3197                 return;
3198
3199         debugfs_create_file("forensics", S_IRUGO, dentry, bus,
3200                             &brcmf_sdio_forensic_ops);
3201         brcmf_debugfs_create_sdio_count(drvr, &bus->sdcnt);
3202 }
3203 #else
3204 static int brcmf_sdbrcm_checkdied(struct brcmf_sdio *bus)
3205 {
3206         return 0;
3207 }
3208
3209 static void brcmf_sdio_debugfs_create(struct brcmf_sdio *bus)
3210 {
3211 }
3212 #endif /* DEBUG */
3213
3214 static int
3215 brcmf_sdbrcm_bus_rxctl(struct device *dev, unsigned char *msg, uint msglen)
3216 {
3217         int timeleft;
3218         uint rxlen = 0;
3219         bool pending;
3220         struct brcmf_bus *bus_if = dev_get_drvdata(dev);
3221         struct brcmf_sdio_dev *sdiodev = bus_if->bus_priv.sdio;
3222         struct brcmf_sdio *bus = sdiodev->bus;
3223
3224         brcmf_dbg(TRACE, "Enter\n");
3225
3226         /* Wait until control frame is available */
3227         timeleft = brcmf_sdbrcm_dcmd_resp_wait(bus, &bus->rxlen, &pending);
3228
3229         down(&bus->sdsem);
3230         rxlen = bus->rxlen;
3231         memcpy(msg, bus->rxctl, min(msglen, rxlen));
3232         bus->rxlen = 0;
3233         up(&bus->sdsem);
3234
3235         if (rxlen) {
3236                 brcmf_dbg(CTL, "resumed on rxctl frame, got %d expected %d\n",
3237                           rxlen, msglen);
3238         } else if (timeleft == 0) {
3239                 brcmf_dbg(ERROR, "resumed on timeout\n");
3240                 brcmf_sdbrcm_checkdied(bus);
3241         } else if (pending) {
3242                 brcmf_dbg(CTL, "cancelled\n");
3243                 return -ERESTARTSYS;
3244         } else {
3245                 brcmf_dbg(CTL, "resumed for unknown reason?\n");
3246                 brcmf_sdbrcm_checkdied(bus);
3247         }
3248
3249         if (rxlen)
3250                 bus->sdcnt.rx_ctlpkts++;
3251         else
3252                 bus->sdcnt.rx_ctlerrs++;
3253
3254         return rxlen ? (int)rxlen : -ETIMEDOUT;
3255 }
3256
3257 static int brcmf_sdbrcm_write_vars(struct brcmf_sdio *bus)
3258 {
3259         int bcmerror = 0;
3260         u32 varaddr;
3261         u32 varsizew;
3262         __le32 varsizew_le;
3263 #ifdef DEBUG
3264         char *nvram_ularray;
3265 #endif                          /* DEBUG */
3266
3267         /* Even if there are no vars are to be written, we still
3268                  need to set the ramsize. */
3269         varaddr = (bus->ramsize - 4) - bus->varsz;
3270
3271         if (bus->vars) {
3272                 /* Write the vars list */
3273                 bcmerror = brcmf_sdbrcm_membytes(bus, true, varaddr,
3274                                                  bus->vars, bus->varsz);
3275 #ifdef DEBUG
3276                 /* Verify NVRAM bytes */
3277                 brcmf_dbg(INFO, "Compare NVRAM dl & ul; varsize=%d\n",
3278                           bus->varsz);
3279                 nvram_ularray = kmalloc(bus->varsz, GFP_ATOMIC);
3280                 if (!nvram_ularray)
3281                         return -ENOMEM;
3282
3283                 /* Upload image to verify downloaded contents. */
3284                 memset(nvram_ularray, 0xaa, bus->varsz);
3285
3286                 /* Read the vars list to temp buffer for comparison */
3287                 bcmerror = brcmf_sdbrcm_membytes(bus, false, varaddr,
3288                                                  nvram_ularray, bus->varsz);
3289                 if (bcmerror) {
3290                         brcmf_dbg(ERROR, "error %d on reading %d nvram bytes at 0x%08x\n",
3291                                   bcmerror, bus->varsz, varaddr);
3292                 }
3293                 /* Compare the org NVRAM with the one read from RAM */
3294                 if (memcmp(bus->vars, nvram_ularray, bus->varsz))
3295                         brcmf_dbg(ERROR, "Downloaded NVRAM image is corrupted\n");
3296                 else
3297                         brcmf_dbg(ERROR, "Download/Upload/Compare of NVRAM ok\n");
3298
3299                 kfree(nvram_ularray);
3300 #endif                          /* DEBUG */
3301         }
3302
3303         /* adjust to the user specified RAM */
3304         brcmf_dbg(INFO, "Physical memory size: %d\n", bus->ramsize);
3305         brcmf_dbg(INFO, "Vars are at %d, orig varsize is %d\n",
3306                   varaddr, bus->varsz);
3307
3308         /*
3309          * Determine the length token:
3310          * Varsize, converted to words, in lower 16-bits, checksum
3311          * in upper 16-bits.
3312          */
3313         if (bcmerror) {
3314                 varsizew = 0;
3315                 varsizew_le = cpu_to_le32(0);
3316         } else {
3317                 varsizew = bus->varsz / 4;
3318                 varsizew = (~varsizew << 16) | (varsizew & 0x0000FFFF);
3319                 varsizew_le = cpu_to_le32(varsizew);
3320         }
3321
3322         brcmf_dbg(INFO, "New varsize is %d, length token=0x%08x\n",
3323                   bus->varsz, varsizew);
3324
3325         /* Write the length token to the last word */
3326         bcmerror = brcmf_sdbrcm_membytes(bus, true, (bus->ramsize - 4),
3327                                          (u8 *)&varsizew_le, 4);
3328
3329         return bcmerror;
3330 }
3331
3332 static int brcmf_sdbrcm_download_state(struct brcmf_sdio *bus, bool enter)
3333 {
3334         int bcmerror = 0;
3335         struct chip_info *ci = bus->ci;
3336
3337         /* To enter download state, disable ARM and reset SOCRAM.
3338          * To exit download state, simply reset ARM (default is RAM boot).
3339          */
3340         if (enter) {
3341                 bus->alp_only = true;
3342
3343                 ci->coredisable(bus->sdiodev, ci, BCMA_CORE_ARM_CM3);
3344
3345                 ci->resetcore(bus->sdiodev, ci, BCMA_CORE_INTERNAL_MEM);
3346
3347                 /* Clear the top bit of memory */
3348                 if (bus->ramsize) {
3349                         u32 zeros = 0;
3350                         brcmf_sdbrcm_membytes(bus, true, bus->ramsize - 4,
3351                                          (u8 *)&zeros, 4);
3352                 }
3353         } else {
3354                 if (!ci->iscoreup(bus->sdiodev, ci, BCMA_CORE_INTERNAL_MEM)) {
3355                         brcmf_dbg(ERROR, "SOCRAM core is down after reset?\n");
3356                         bcmerror = -EBADE;
3357                         goto fail;
3358                 }
3359
3360                 bcmerror = brcmf_sdbrcm_write_vars(bus);
3361                 if (bcmerror) {
3362                         brcmf_dbg(ERROR, "no vars written to RAM\n");
3363                         bcmerror = 0;
3364                 }
3365
3366                 w_sdreg32(bus, 0xFFFFFFFF,
3367                           offsetof(struct sdpcmd_regs, intstatus));
3368
3369                 ci->resetcore(bus->sdiodev, ci, BCMA_CORE_ARM_CM3);
3370
3371                 /* Allow HT Clock now that the ARM is running. */
3372                 bus->alp_only = false;
3373
3374                 bus->sdiodev->bus_if->state = BRCMF_BUS_LOAD;
3375         }
3376 fail:
3377         return bcmerror;
3378 }
3379
3380 static int brcmf_sdbrcm_get_image(char *buf, int len, struct brcmf_sdio *bus)
3381 {
3382         if (bus->firmware->size < bus->fw_ptr + len)
3383                 len = bus->firmware->size - bus->fw_ptr;
3384
3385         memcpy(buf, &bus->firmware->data[bus->fw_ptr], len);
3386         bus->fw_ptr += len;
3387         return len;
3388 }
3389
3390 static int brcmf_sdbrcm_download_code_file(struct brcmf_sdio *bus)
3391 {
3392         int offset = 0;
3393         uint len;
3394         u8 *memblock = NULL, *memptr;
3395         int ret;
3396
3397         brcmf_dbg(INFO, "Enter\n");
3398
3399         ret = request_firmware(&bus->firmware, BRCMF_SDIO_FW_NAME,
3400                                &bus->sdiodev->func[2]->dev);
3401         if (ret) {
3402                 brcmf_dbg(ERROR, "Fail to request firmware %d\n", ret);
3403                 return ret;
3404         }
3405         bus->fw_ptr = 0;
3406
3407         memptr = memblock = kmalloc(MEMBLOCK + BRCMF_SDALIGN, GFP_ATOMIC);
3408         if (memblock == NULL) {
3409                 ret = -ENOMEM;
3410                 goto err;
3411         }
3412         if ((u32)(unsigned long)memblock % BRCMF_SDALIGN)
3413                 memptr += (BRCMF_SDALIGN -
3414                            ((u32)(unsigned long)memblock % BRCMF_SDALIGN));
3415
3416         /* Download image */
3417         while ((len =
3418                 brcmf_sdbrcm_get_image((char *)memptr, MEMBLOCK, bus))) {
3419                 ret = brcmf_sdbrcm_membytes(bus, true, offset, memptr, len);
3420                 if (ret) {
3421                         brcmf_dbg(ERROR, "error %d on writing %d membytes at 0x%08x\n",
3422                                   ret, MEMBLOCK, offset);
3423                         goto err;
3424                 }
3425
3426                 offset += MEMBLOCK;
3427         }
3428
3429 err:
3430         kfree(memblock);
3431
3432         release_firmware(bus->firmware);
3433         bus->fw_ptr = 0;
3434
3435         return ret;
3436 }
3437
3438 /*
3439  * ProcessVars:Takes a buffer of "<var>=<value>\n" lines read from a file
3440  * and ending in a NUL.
3441  * Removes carriage returns, empty lines, comment lines, and converts
3442  * newlines to NULs.
3443  * Shortens buffer as needed and pads with NULs.  End of buffer is marked
3444  * by two NULs.
3445 */
3446
3447 static int brcmf_process_nvram_vars(struct brcmf_sdio *bus)
3448 {
3449         char *varbuf;
3450         char *dp;
3451         bool findNewline;
3452         int column;
3453         int ret = 0;
3454         uint buf_len, n, len;
3455
3456         len = bus->firmware->size;
3457         varbuf = vmalloc(len);
3458         if (!varbuf)
3459                 return -ENOMEM;
3460
3461         memcpy(varbuf, bus->firmware->data, len);
3462         dp = varbuf;
3463
3464         findNewline = false;
3465         column = 0;
3466
3467         for (n = 0; n < len; n++) {
3468                 if (varbuf[n] == 0)
3469                         break;
3470                 if (varbuf[n] == '\r')
3471                         continue;
3472                 if (findNewline && varbuf[n] != '\n')
3473                         continue;
3474                 findNewline = false;
3475                 if (varbuf[n] == '#') {
3476                         findNewline = true;
3477                         continue;
3478                 }
3479                 if (varbuf[n] == '\n') {
3480                         if (column == 0)
3481                                 continue;
3482                         *dp++ = 0;
3483                         column = 0;
3484                         continue;
3485                 }
3486                 *dp++ = varbuf[n];
3487                 column++;
3488         }
3489         buf_len = dp - varbuf;
3490         while (dp < varbuf + n)
3491                 *dp++ = 0;
3492
3493         kfree(bus->vars);
3494         /* roundup needed for download to device */
3495         bus->varsz = roundup(buf_len + 1, 4);
3496         bus->vars = kmalloc(bus->varsz, GFP_KERNEL);
3497         if (bus->vars == NULL) {
3498                 bus->varsz = 0;
3499                 ret = -ENOMEM;
3500                 goto err;
3501         }
3502
3503         /* copy the processed variables and add null termination */
3504         memcpy(bus->vars, varbuf, buf_len);
3505         bus->vars[buf_len] = 0;
3506 err:
3507         vfree(varbuf);
3508         return ret;
3509 }
3510
3511 static int brcmf_sdbrcm_download_nvram(struct brcmf_sdio *bus)
3512 {
3513         int ret;
3514
3515         if (bus->sdiodev->bus_if->drvr_up)
3516                 return -EISCONN;
3517
3518         ret = request_firmware(&bus->firmware, BRCMF_SDIO_NV_NAME,
3519                                &bus->sdiodev->func[2]->dev);
3520         if (ret) {
3521                 brcmf_dbg(ERROR, "Fail to request nvram %d\n", ret);
3522                 return ret;
3523         }
3524
3525         ret = brcmf_process_nvram_vars(bus);
3526
3527         release_firmware(bus->firmware);
3528
3529         return ret;
3530 }
3531
3532 static int _brcmf_sdbrcm_download_firmware(struct brcmf_sdio *bus)
3533 {
3534         int bcmerror = -1;
3535
3536         /* Keep arm in reset */
3537         if (brcmf_sdbrcm_download_state(bus, true)) {
3538                 brcmf_dbg(ERROR, "error placing ARM core in reset\n");
3539                 goto err;
3540         }
3541
3542         /* External image takes precedence if specified */
3543         if (brcmf_sdbrcm_download_code_file(bus)) {
3544                 brcmf_dbg(ERROR, "dongle image file download failed\n");
3545                 goto err;
3546         }
3547
3548         /* External nvram takes precedence if specified */
3549         if (brcmf_sdbrcm_download_nvram(bus))
3550                 brcmf_dbg(ERROR, "dongle nvram file download failed\n");
3551
3552         /* Take arm out of reset */
3553         if (brcmf_sdbrcm_download_state(bus, false)) {
3554                 brcmf_dbg(ERROR, "error getting out of ARM core reset\n");
3555                 goto err;
3556         }
3557
3558         bcmerror = 0;
3559
3560 err:
3561         return bcmerror;
3562 }
3563
3564 static bool
3565 brcmf_sdbrcm_download_firmware(struct brcmf_sdio *bus)
3566 {
3567         bool ret;
3568
3569         /* Download the firmware */
3570         brcmf_sdbrcm_clkctl(bus, CLK_AVAIL, false);
3571
3572         ret = _brcmf_sdbrcm_download_firmware(bus) == 0;
3573
3574         brcmf_sdbrcm_clkctl(bus, CLK_SDONLY, false);
3575
3576         return ret;
3577 }
3578
3579 static int brcmf_sdbrcm_bus_init(struct device *dev)
3580 {
3581         struct brcmf_bus *bus_if = dev_get_drvdata(dev);
3582         struct brcmf_sdio_dev *sdiodev = bus_if->bus_priv.sdio;
3583         struct brcmf_sdio *bus = sdiodev->bus;
3584         unsigned long timeout;
3585         u8 ready, enable;
3586         int err, ret = 0;
3587         u8 saveclk;
3588
3589         brcmf_dbg(TRACE, "Enter\n");
3590
3591         /* try to download image and nvram to the dongle */
3592         if (bus_if->state == BRCMF_BUS_DOWN) {
3593                 if (!(brcmf_sdbrcm_download_firmware(bus)))
3594                         return -1;
3595         }
3596
3597         if (!bus->sdiodev->bus_if->drvr)
3598                 return 0;
3599
3600         /* Start the watchdog timer */
3601         bus->sdcnt.tickcnt = 0;
3602         brcmf_sdbrcm_wd_timer(bus, BRCMF_WD_POLL_MS);
3603
3604         down(&bus->sdsem);
3605
3606         /* Make sure backplane clock is on, needed to generate F2 interrupt */
3607         brcmf_sdbrcm_clkctl(bus, CLK_AVAIL, false);
3608         if (bus->clkstate != CLK_AVAIL)
3609                 goto exit;
3610
3611         /* Force clocks on backplane to be sure F2 interrupt propagates */
3612         saveclk = brcmf_sdio_regrb(bus->sdiodev,
3613                                    SBSDIO_FUNC1_CHIPCLKCSR, &err);
3614         if (!err) {
3615                 brcmf_sdio_regwb(bus->sdiodev, SBSDIO_FUNC1_CHIPCLKCSR,
3616                                  (saveclk | SBSDIO_FORCE_HT), &err);
3617         }
3618         if (err) {
3619                 brcmf_dbg(ERROR, "Failed to force clock for F2: err %d\n", err);
3620                 goto exit;
3621         }
3622
3623         /* Enable function 2 (frame transfers) */
3624         w_sdreg32(bus, SDPCM_PROT_VERSION << SMB_DATA_VERSION_SHIFT,
3625                   offsetof(struct sdpcmd_regs, tosbmailboxdata));
3626         enable = (SDIO_FUNC_ENABLE_1 | SDIO_FUNC_ENABLE_2);
3627
3628         brcmf_sdio_regwb(bus->sdiodev, SDIO_CCCR_IOEx, enable, NULL);
3629
3630         timeout = jiffies + msecs_to_jiffies(BRCMF_WAIT_F2RDY);
3631         ready = 0;
3632         while (enable != ready) {
3633                 ready = brcmf_sdio_regrb(bus->sdiodev,
3634                                          SDIO_CCCR_IORx, NULL);
3635                 if (time_after(jiffies, timeout))
3636                         break;
3637                 else if (time_after(jiffies, timeout - BRCMF_WAIT_F2RDY + 50))
3638                         /* prevent busy waiting if it takes too long */
3639                         msleep_interruptible(20);
3640         }
3641
3642         brcmf_dbg(INFO, "enable 0x%02x, ready 0x%02x\n", enable, ready);
3643
3644         /* If F2 successfully enabled, set core and enable interrupts */
3645         if (ready == enable) {
3646                 /* Set up the interrupt mask and enable interrupts */
3647                 bus->hostintmask = HOSTINTMASK;
3648                 w_sdreg32(bus, bus->hostintmask,
3649                           offsetof(struct sdpcmd_regs, hostintmask));
3650
3651                 brcmf_sdio_regwb(bus->sdiodev, SBSDIO_WATERMARK, 8, &err);
3652         } else {
3653                 /* Disable F2 again */
3654                 enable = SDIO_FUNC_ENABLE_1;
3655                 brcmf_sdio_regwb(bus->sdiodev, SDIO_CCCR_IOEx, enable, NULL);
3656                 ret = -ENODEV;
3657         }
3658
3659         /* Restore previous clock setting */
3660         brcmf_sdio_regwb(bus->sdiodev, SBSDIO_FUNC1_CHIPCLKCSR, saveclk, &err);
3661
3662         if (ret == 0) {
3663                 ret = brcmf_sdio_intr_register(bus->sdiodev);
3664                 if (ret != 0)
3665                         brcmf_dbg(ERROR, "intr register failed:%d\n", ret);
3666         }
3667
3668         /* If we didn't come up, turn off backplane clock */
3669         if (bus_if->state != BRCMF_BUS_DATA)
3670                 brcmf_sdbrcm_clkctl(bus, CLK_NONE, false);
3671
3672 exit:
3673         up(&bus->sdsem);
3674
3675         return ret;
3676 }
3677
3678 void brcmf_sdbrcm_isr(void *arg)
3679 {
3680         struct brcmf_sdio *bus = (struct brcmf_sdio *) arg;
3681
3682         brcmf_dbg(TRACE, "Enter\n");
3683
3684         if (!bus) {
3685                 brcmf_dbg(ERROR, "bus is null pointer, exiting\n");
3686                 return;
3687         }
3688
3689         if (bus->sdiodev->bus_if->state == BRCMF_BUS_DOWN) {
3690                 brcmf_dbg(ERROR, "bus is down. we have nothing to do\n");
3691                 return;
3692         }
3693         /* Count the interrupt call */
3694         bus->sdcnt.intrcount++;
3695         bus->ipend = true;
3696
3697         /* Disable additional interrupts (is this needed now)? */
3698         if (!bus->intr)
3699                 brcmf_dbg(ERROR, "isr w/o interrupt configured!\n");
3700
3701         bus->dpc_sched = true;
3702         if (bus->dpc_tsk) {
3703                 brcmf_sdbrcm_adddpctsk(bus);
3704                 complete(&bus->dpc_wait);
3705         }
3706 }
3707
3708 static bool brcmf_sdbrcm_bus_watchdog(struct brcmf_sdio *bus)
3709 {
3710 #ifdef DEBUG
3711         struct brcmf_bus *bus_if = dev_get_drvdata(bus->sdiodev->dev);
3712 #endif  /* DEBUG */
3713
3714         brcmf_dbg(TIMER, "Enter\n");
3715
3716         down(&bus->sdsem);
3717
3718         /* Poll period: check device if appropriate. */
3719         if (bus->poll && (++bus->polltick >= bus->pollrate)) {
3720                 u32 intstatus = 0;
3721
3722                 /* Reset poll tick */
3723                 bus->polltick = 0;
3724
3725                 /* Check device if no interrupts */
3726                 if (!bus->intr ||
3727                     (bus->sdcnt.intrcount == bus->sdcnt.lastintrs)) {
3728
3729                         if (!bus->dpc_sched) {
3730                                 u8 devpend;
3731                                 devpend = brcmf_sdio_regrb(bus->sdiodev,
3732                                                            SDIO_CCCR_INTx,
3733                                                            NULL);
3734                                 intstatus =
3735                                     devpend & (INTR_STATUS_FUNC1 |
3736                                                INTR_STATUS_FUNC2);
3737                         }
3738
3739                         /* If there is something, make like the ISR and
3740                                  schedule the DPC */
3741                         if (intstatus) {
3742                                 bus->sdcnt.pollcnt++;
3743                                 bus->ipend = true;
3744
3745                                 bus->dpc_sched = true;
3746                                 if (bus->dpc_tsk) {
3747                                         brcmf_sdbrcm_adddpctsk(bus);
3748                                         complete(&bus->dpc_wait);
3749                                 }
3750                         }
3751                 }
3752
3753                 /* Update interrupt tracking */
3754                 bus->sdcnt.lastintrs = bus->sdcnt.intrcount;
3755         }
3756 #ifdef DEBUG
3757         /* Poll for console output periodically */
3758         if (bus_if->state == BRCMF_BUS_DATA &&
3759             bus->console_interval != 0) {
3760                 bus->console.count += BRCMF_WD_POLL_MS;
3761                 if (bus->console.count >= bus->console_interval) {
3762                         bus->console.count -= bus->console_interval;
3763                         /* Make sure backplane clock is on */
3764                         brcmf_sdbrcm_clkctl(bus, CLK_AVAIL, false);
3765                         if (brcmf_sdbrcm_readconsole(bus) < 0)
3766                                 /* stop on error */
3767                                 bus->console_interval = 0;
3768                 }
3769         }
3770 #endif                          /* DEBUG */
3771
3772         /* On idle timeout clear activity flag and/or turn off clock */
3773         if ((bus->idletime > 0) && (bus->clkstate == CLK_AVAIL)) {
3774                 if (++bus->idlecount >= bus->idletime) {
3775                         bus->idlecount = 0;
3776                         if (bus->activity) {
3777                                 bus->activity = false;
3778                                 brcmf_sdbrcm_wd_timer(bus, BRCMF_WD_POLL_MS);
3779                         } else {
3780                                 brcmf_sdbrcm_clkctl(bus, CLK_NONE, false);
3781                         }
3782                 }
3783         }
3784
3785         up(&bus->sdsem);
3786
3787         return bus->ipend;
3788 }
3789
3790 static bool brcmf_sdbrcm_chipmatch(u16 chipid)
3791 {
3792         if (chipid == BCM43241_CHIP_ID)
3793                 return true;
3794         if (chipid == BCM4329_CHIP_ID)
3795                 return true;
3796         if (chipid == BCM4330_CHIP_ID)
3797                 return true;
3798         if (chipid == BCM4334_CHIP_ID)
3799                 return true;
3800         return false;
3801 }
3802
3803 static void brcmf_sdbrcm_release_malloc(struct brcmf_sdio *bus)
3804 {
3805         brcmf_dbg(TRACE, "Enter\n");
3806
3807         kfree(bus->rxbuf);
3808         bus->rxctl = bus->rxbuf = NULL;
3809         bus->rxlen = 0;
3810
3811         kfree(bus->databuf);
3812         bus->databuf = NULL;
3813 }
3814
3815 static bool brcmf_sdbrcm_probe_malloc(struct brcmf_sdio *bus)
3816 {
3817         brcmf_dbg(TRACE, "Enter\n");
3818
3819         if (bus->sdiodev->bus_if->maxctl) {
3820                 bus->rxblen =
3821                     roundup((bus->sdiodev->bus_if->maxctl + SDPCM_HDRLEN),
3822                             ALIGNMENT) + BRCMF_SDALIGN;
3823                 bus->rxbuf = kmalloc(bus->rxblen, GFP_ATOMIC);
3824                 if (!(bus->rxbuf))
3825                         goto fail;
3826         }
3827
3828         /* Allocate buffer to receive glomed packet */
3829         bus->databuf = kmalloc(MAX_DATA_BUF, GFP_ATOMIC);
3830         if (!(bus->databuf)) {
3831                 /* release rxbuf which was already located as above */
3832                 if (!bus->rxblen)
3833                         kfree(bus->rxbuf);
3834                 goto fail;
3835         }
3836
3837         /* Align the buffer */
3838         if ((unsigned long)bus->databuf % BRCMF_SDALIGN)
3839                 bus->dataptr = bus->databuf + (BRCMF_SDALIGN -
3840                                ((unsigned long)bus->databuf % BRCMF_SDALIGN));
3841         else
3842                 bus->dataptr = bus->databuf;
3843
3844         return true;
3845
3846 fail:
3847         return false;
3848 }
3849
3850 static bool
3851 brcmf_sdbrcm_probe_attach(struct brcmf_sdio *bus, u32 regsva)
3852 {
3853         u8 clkctl = 0;
3854         int err = 0;
3855         int reg_addr;
3856         u32 reg_val;
3857         u8 idx;
3858
3859         bus->alp_only = true;
3860
3861         pr_debug("F1 signature read @0x18000000=0x%4x\n",
3862                  brcmf_sdio_regrl(bus->sdiodev, SI_ENUM_BASE, NULL));
3863
3864         /*
3865          * Force PLL off until brcmf_sdio_chip_attach()
3866          * programs PLL control regs
3867          */
3868
3869         brcmf_sdio_regwb(bus->sdiodev, SBSDIO_FUNC1_CHIPCLKCSR,
3870                          BRCMF_INIT_CLKCTL1, &err);
3871         if (!err)
3872                 clkctl = brcmf_sdio_regrb(bus->sdiodev,
3873                                           SBSDIO_FUNC1_CHIPCLKCSR, &err);
3874
3875         if (err || ((clkctl & ~SBSDIO_AVBITS) != BRCMF_INIT_CLKCTL1)) {
3876                 brcmf_dbg(ERROR, "ChipClkCSR access: err %d wrote 0x%02x read 0x%02x\n",
3877                           err, BRCMF_INIT_CLKCTL1, clkctl);
3878                 goto fail;
3879         }
3880
3881         if (brcmf_sdio_chip_attach(bus->sdiodev, &bus->ci, regsva)) {
3882                 brcmf_dbg(ERROR, "brcmf_sdio_chip_attach failed!\n");
3883                 goto fail;
3884         }
3885
3886         if (!brcmf_sdbrcm_chipmatch((u16) bus->ci->chip)) {
3887                 brcmf_dbg(ERROR, "unsupported chip: 0x%04x\n", bus->ci->chip);
3888                 goto fail;
3889         }
3890
3891         brcmf_sdio_chip_drivestrengthinit(bus->sdiodev, bus->ci,
3892                                           SDIO_DRIVE_STRENGTH);
3893
3894         /* Get info on the SOCRAM cores... */
3895         bus->ramsize = bus->ci->ramsize;
3896         if (!(bus->ramsize)) {
3897                 brcmf_dbg(ERROR, "failed to find SOCRAM memory!\n");
3898                 goto fail;
3899         }
3900
3901         /* Set core control so an SDIO reset does a backplane reset */
3902         idx = brcmf_sdio_chip_getinfidx(bus->ci, BCMA_CORE_SDIO_DEV);
3903         reg_addr = bus->ci->c_inf[idx].base +
3904                    offsetof(struct sdpcmd_regs, corecontrol);
3905         reg_val = brcmf_sdio_regrl(bus->sdiodev, reg_addr, NULL);
3906         brcmf_sdio_regwl(bus->sdiodev, reg_addr, reg_val | CC_BPRESEN, NULL);
3907
3908         brcmu_pktq_init(&bus->txq, (PRIOMASK + 1), TXQLEN);
3909
3910         /* Locate an appropriately-aligned portion of hdrbuf */
3911         bus->rxhdr = (u8 *) roundup((unsigned long)&bus->hdrbuf[0],
3912                                     BRCMF_SDALIGN);
3913
3914         /* Set the poll and/or interrupt flags */
3915         bus->intr = true;
3916         bus->poll = false;
3917         if (bus->poll)
3918                 bus->pollrate = 1;
3919
3920         return true;
3921
3922 fail:
3923         return false;
3924 }
3925
3926 static bool brcmf_sdbrcm_probe_init(struct brcmf_sdio *bus)
3927 {
3928         brcmf_dbg(TRACE, "Enter\n");
3929
3930         /* Disable F2 to clear any intermediate frame state on the dongle */
3931         brcmf_sdio_regwb(bus->sdiodev, SDIO_CCCR_IOEx,
3932                          SDIO_FUNC_ENABLE_1, NULL);
3933
3934         bus->sdiodev->bus_if->state = BRCMF_BUS_DOWN;
3935         bus->rxflow = false;
3936
3937         /* Done with backplane-dependent accesses, can drop clock... */
3938         brcmf_sdio_regwb(bus->sdiodev, SBSDIO_FUNC1_CHIPCLKCSR, 0, NULL);
3939
3940         /* ...and initialize clock/power states */
3941         bus->clkstate = CLK_SDONLY;
3942         bus->idletime = BRCMF_IDLE_INTERVAL;
3943         bus->idleclock = BRCMF_IDLE_ACTIVE;
3944
3945         /* Query the F2 block size, set roundup accordingly */
3946         bus->blocksize = bus->sdiodev->func[2]->cur_blksize;
3947         bus->roundup = min(max_roundup, bus->blocksize);
3948
3949         /* bus module does not support packet chaining */
3950         bus->use_rxchain = false;
3951         bus->sd_rxchain = false;
3952
3953         return true;
3954 }
3955
3956 static int
3957 brcmf_sdbrcm_watchdog_thread(void *data)
3958 {
3959         struct brcmf_sdio *bus = (struct brcmf_sdio *)data;
3960
3961         allow_signal(SIGTERM);
3962         /* Run until signal received */
3963         while (1) {
3964                 if (kthread_should_stop())
3965                         break;
3966                 if (!wait_for_completion_interruptible(&bus->watchdog_wait)) {
3967                         brcmf_sdbrcm_bus_watchdog(bus);
3968                         /* Count the tick for reference */
3969                         bus->sdcnt.tickcnt++;
3970                 } else
3971                         break;
3972         }
3973         return 0;
3974 }
3975
3976 static void
3977 brcmf_sdbrcm_watchdog(unsigned long data)
3978 {
3979         struct brcmf_sdio *bus = (struct brcmf_sdio *)data;
3980
3981         if (bus->watchdog_tsk) {
3982                 complete(&bus->watchdog_wait);
3983                 /* Reschedule the watchdog */
3984                 if (bus->wd_timer_valid)
3985                         mod_timer(&bus->timer,
3986                                   jiffies + BRCMF_WD_POLL_MS * HZ / 1000);
3987         }
3988 }
3989
3990 static void brcmf_sdbrcm_release_dongle(struct brcmf_sdio *bus)
3991 {
3992         brcmf_dbg(TRACE, "Enter\n");
3993
3994         if (bus->ci) {
3995                 brcmf_sdbrcm_clkctl(bus, CLK_AVAIL, false);
3996                 brcmf_sdbrcm_clkctl(bus, CLK_NONE, false);
3997                 brcmf_sdio_chip_detach(&bus->ci);
3998                 if (bus->vars && bus->varsz)
3999                         kfree(bus->vars);
4000                 bus->vars = NULL;
4001         }
4002
4003         brcmf_dbg(TRACE, "Disconnected\n");
4004 }
4005
4006 /* Detach and free everything */
4007 static void brcmf_sdbrcm_release(struct brcmf_sdio *bus)
4008 {
4009         brcmf_dbg(TRACE, "Enter\n");
4010
4011         if (bus) {
4012                 /* De-register interrupt handler */
4013                 brcmf_sdio_intr_unregister(bus->sdiodev);
4014
4015                 if (bus->sdiodev->bus_if->drvr) {
4016                         brcmf_detach(bus->sdiodev->dev);
4017                         brcmf_sdbrcm_release_dongle(bus);
4018                 }
4019
4020                 brcmf_sdbrcm_release_malloc(bus);
4021
4022                 kfree(bus);
4023         }
4024
4025         brcmf_dbg(TRACE, "Disconnected\n");
4026 }
4027
4028 void *brcmf_sdbrcm_probe(u32 regsva, struct brcmf_sdio_dev *sdiodev)
4029 {
4030         int ret;
4031         struct brcmf_sdio *bus;
4032         struct brcmf_bus_dcmd *dlst;
4033         u32 dngl_txglom;
4034         u32 dngl_txglomalign;
4035         u8 idx;
4036
4037         brcmf_dbg(TRACE, "Enter\n");
4038
4039         /* We make an assumption about address window mappings:
4040          * regsva == SI_ENUM_BASE*/
4041
4042         /* Allocate private bus interface state */
4043         bus = kzalloc(sizeof(struct brcmf_sdio), GFP_ATOMIC);
4044         if (!bus)
4045                 goto fail;
4046
4047         bus->sdiodev = sdiodev;
4048         sdiodev->bus = bus;
4049         skb_queue_head_init(&bus->glom);
4050         bus->txbound = BRCMF_TXBOUND;
4051         bus->rxbound = BRCMF_RXBOUND;
4052         bus->txminmax = BRCMF_TXMINMAX;
4053         bus->tx_seq = SDPCM_SEQUENCE_WRAP - 1;
4054         bus->usebufpool = false;        /* Use bufpool if allocated,
4055                                          else use locally malloced rxbuf */
4056
4057         /* attempt to attach to the dongle */
4058         if (!(brcmf_sdbrcm_probe_attach(bus, regsva))) {
4059                 brcmf_dbg(ERROR, "brcmf_sdbrcm_probe_attach failed\n");
4060                 goto fail;
4061         }
4062
4063         spin_lock_init(&bus->txqlock);
4064         init_waitqueue_head(&bus->ctrl_wait);
4065         init_waitqueue_head(&bus->dcmd_resp_wait);
4066
4067         /* Set up the watchdog timer */
4068         init_timer(&bus->timer);
4069         bus->timer.data = (unsigned long)bus;
4070         bus->timer.function = brcmf_sdbrcm_watchdog;
4071
4072         /* Initialize thread based operation and lock */
4073         sema_init(&bus->sdsem, 1);
4074
4075         /* Initialize watchdog thread */
4076         init_completion(&bus->watchdog_wait);
4077         bus->watchdog_tsk = kthread_run(brcmf_sdbrcm_watchdog_thread,
4078                                         bus, "brcmf_watchdog");
4079         if (IS_ERR(bus->watchdog_tsk)) {
4080                 pr_warn("brcmf_watchdog thread failed to start\n");
4081                 bus->watchdog_tsk = NULL;
4082         }
4083         /* Initialize DPC thread */
4084         init_completion(&bus->dpc_wait);
4085         INIT_LIST_HEAD(&bus->dpc_tsklst);
4086         spin_lock_init(&bus->dpc_tl_lock);
4087         bus->dpc_tsk = kthread_run(brcmf_sdbrcm_dpc_thread,
4088                                    bus, "brcmf_dpc");
4089         if (IS_ERR(bus->dpc_tsk)) {
4090                 pr_warn("brcmf_dpc thread failed to start\n");
4091                 bus->dpc_tsk = NULL;
4092         }
4093
4094         /* Assign bus interface call back */
4095         bus->sdiodev->bus_if->brcmf_bus_stop = brcmf_sdbrcm_bus_stop;
4096         bus->sdiodev->bus_if->brcmf_bus_init = brcmf_sdbrcm_bus_init;
4097         bus->sdiodev->bus_if->brcmf_bus_txdata = brcmf_sdbrcm_bus_txdata;
4098         bus->sdiodev->bus_if->brcmf_bus_txctl = brcmf_sdbrcm_bus_txctl;
4099         bus->sdiodev->bus_if->brcmf_bus_rxctl = brcmf_sdbrcm_bus_rxctl;
4100         /* Attach to the brcmf/OS/network interface */
4101         ret = brcmf_attach(SDPCM_RESERVE, bus->sdiodev->dev);
4102         if (ret != 0) {
4103                 brcmf_dbg(ERROR, "brcmf_attach failed\n");
4104                 goto fail;
4105         }
4106
4107         /* Allocate buffers */
4108         if (!(brcmf_sdbrcm_probe_malloc(bus))) {
4109                 brcmf_dbg(ERROR, "brcmf_sdbrcm_probe_malloc failed\n");
4110                 goto fail;
4111         }
4112
4113         if (!(brcmf_sdbrcm_probe_init(bus))) {
4114                 brcmf_dbg(ERROR, "brcmf_sdbrcm_probe_init failed\n");
4115                 goto fail;
4116         }
4117
4118         brcmf_sdio_debugfs_create(bus);
4119         brcmf_dbg(INFO, "completed!!\n");
4120
4121         /* sdio bus core specific dcmd */
4122         idx = brcmf_sdio_chip_getinfidx(bus->ci, BCMA_CORE_SDIO_DEV);
4123         dlst = kzalloc(sizeof(struct brcmf_bus_dcmd), GFP_KERNEL);
4124         if (dlst) {
4125                 if (bus->ci->c_inf[idx].rev < 12) {
4126                         /* for sdio core rev < 12, disable txgloming */
4127                         dngl_txglom = 0;
4128                         dlst->name = "bus:txglom";
4129                         dlst->param = (char *)&dngl_txglom;
4130                         dlst->param_len = sizeof(u32);
4131                 } else {
4132                         /* otherwise, set txglomalign */
4133                         dngl_txglomalign = bus->sdiodev->bus_if->align;
4134                         dlst->name = "bus:txglomalign";
4135                         dlst->param = (char *)&dngl_txglomalign;
4136                         dlst->param_len = sizeof(u32);
4137                 }
4138                 list_add(&dlst->list, &bus->sdiodev->bus_if->dcmd_list);
4139         }
4140
4141         /* if firmware path present try to download and bring up bus */
4142         ret = brcmf_bus_start(bus->sdiodev->dev);
4143         if (ret != 0) {
4144                 if (ret == -ENOLINK) {
4145                         brcmf_dbg(ERROR, "dongle is not responding\n");
4146                         goto fail;
4147                 }
4148         }
4149
4150         return bus;
4151
4152 fail:
4153         brcmf_sdbrcm_release(bus);
4154         return NULL;
4155 }
4156
4157 void brcmf_sdbrcm_disconnect(void *ptr)
4158 {
4159         struct brcmf_sdio *bus = (struct brcmf_sdio *)ptr;
4160
4161         brcmf_dbg(TRACE, "Enter\n");
4162
4163         if (bus)
4164                 brcmf_sdbrcm_release(bus);
4165
4166         brcmf_dbg(TRACE, "Disconnected\n");
4167 }
4168
4169 void
4170 brcmf_sdbrcm_wd_timer(struct brcmf_sdio *bus, uint wdtick)
4171 {
4172         /* Totally stop the timer */
4173         if (!wdtick && bus->wd_timer_valid) {
4174                 del_timer_sync(&bus->timer);
4175                 bus->wd_timer_valid = false;
4176                 bus->save_ms = wdtick;
4177                 return;
4178         }
4179
4180         /* don't start the wd until fw is loaded */
4181         if (bus->sdiodev->bus_if->state == BRCMF_BUS_DOWN)
4182                 return;
4183
4184         if (wdtick) {
4185                 if (bus->save_ms != BRCMF_WD_POLL_MS) {
4186                         if (bus->wd_timer_valid)
4187                                 /* Stop timer and restart at new value */
4188                                 del_timer_sync(&bus->timer);
4189
4190                         /* Create timer again when watchdog period is
4191                            dynamically changed or in the first instance
4192                          */
4193                         bus->timer.expires =
4194                                 jiffies + BRCMF_WD_POLL_MS * HZ / 1000;
4195                         add_timer(&bus->timer);
4196
4197                 } else {
4198                         /* Re arm the timer, at last watchdog period */
4199                         mod_timer(&bus->timer,
4200                                 jiffies + BRCMF_WD_POLL_MS * HZ / 1000);
4201                 }
4202
4203                 bus->wd_timer_valid = true;
4204                 bus->save_ms = wdtick;
4205         }
4206 }