drivers/dma/ste_dma40.c

   1 /*
   2  * Copyright (C) Ericsson AB 2007-2008
   3  * Copyright (C) ST-Ericsson SA 2008-2010
   4  * Author: Per Forlin <per.forlin@stericsson.com> for ST-Ericsson
   5  * Author: Jonas Aaberg <jonas.aberg@stericsson.com> for ST-Ericsson
   6  * License terms: GNU General Public License (GPL) version 2
   7  */
   8
   9 #include <linux/dma-mapping.h>
  10 #include <linux/kernel.h>
  11 #include <linux/slab.h>
  12 #include <linux/export.h>
  13 #include <linux/dmaengine.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/clk.h>
  16 #include <linux/delay.h>
  17 #include <linux/log2.h>
  18 #include <linux/pm.h>
  19 #include <linux/pm_runtime.h>
  20 #include <linux/err.h>
  21 #include <linux/of.h>
  22 #include <linux/of_dma.h>
  23 #include <linux/amba/bus.h>
  24 #include <linux/regulator/consumer.h>
  25 #include <linux/platform_data/dma-ste-dma40.h>
  26
  27 #include "dmaengine.h"
  28 #include "ste_dma40_ll.h"
  29
  30 #define D40_NAME "dma40"
  31
  32 #define D40_PHY_CHAN -1
  33
  34 /* For masking out/in 2 bit channel positions */
  35 #define D40_CHAN_POS(chan)  (2 * (chan / 2))
  36 #define D40_CHAN_POS_MASK(chan) (0x3 << D40_CHAN_POS(chan))
  37
  38 /* Maximum iterations taken before giving up suspending a channel */
  39 #define D40_SUSPEND_MAX_IT 500
  40
  41 /* Milliseconds */
  42 #define DMA40_AUTOSUSPEND_DELAY 100
  43
  44 /* Hardware requirement on LCLA alignment */
  45 #define LCLA_ALIGNMENT 0x40000
  46
  47 /* Max number of links per event group */
  48 #define D40_LCLA_LINK_PER_EVENT_GRP 128
  49 #define D40_LCLA_END D40_LCLA_LINK_PER_EVENT_GRP
  50
  51 /* Max number of logical channels per physical channel */
  52 #define D40_MAX_LOG_CHAN_PER_PHY 32
  53
  54 /* Attempts before giving up to trying to get pages that are aligned */
  55 #define MAX_LCLA_ALLOC_ATTEMPTS 256
  56
  57 /* Bit markings for allocation map */
  58 #define D40_ALLOC_FREE          BIT(31)
  59 #define D40_ALLOC_PHY           BIT(30)
  60 #define D40_ALLOC_LOG_FREE      0
  61
  62 #define D40_MEMCPY_MAX_CHANS    8
  63
  64 /* Reserved event lines for memcpy only. */
  65 #define DB8500_DMA_MEMCPY_EV_0  51
  66 #define DB8500_DMA_MEMCPY_EV_1  56
  67 #define DB8500_DMA_MEMCPY_EV_2  57
  68 #define DB8500_DMA_MEMCPY_EV_3  58
  69 #define DB8500_DMA_MEMCPY_EV_4  59
  70 #define DB8500_DMA_MEMCPY_EV_5  60
  71
  72 static int dma40_memcpy_channels[] = {
  73         DB8500_DMA_MEMCPY_EV_0,
  74         DB8500_DMA_MEMCPY_EV_1,
  75         DB8500_DMA_MEMCPY_EV_2,
  76         DB8500_DMA_MEMCPY_EV_3,
  77         DB8500_DMA_MEMCPY_EV_4,
  78         DB8500_DMA_MEMCPY_EV_5,
  79 };
  80
  81 /* Default configuration for physcial memcpy */
  82 static struct stedma40_chan_cfg dma40_memcpy_conf_phy = {
  83         .mode = STEDMA40_MODE_PHYSICAL,
  84         .dir = DMA_MEM_TO_MEM,
  85
  86         .src_info.data_width = DMA_SLAVE_BUSWIDTH_1_BYTE,
  87         .src_info.psize = STEDMA40_PSIZE_PHY_1,
  88         .src_info.flow_ctrl = STEDMA40_NO_FLOW_CTRL,
  89
  90         .dst_info.data_width = DMA_SLAVE_BUSWIDTH_1_BYTE,
  91         .dst_info.psize = STEDMA40_PSIZE_PHY_1,
  92         .dst_info.flow_ctrl = STEDMA40_NO_FLOW_CTRL,
  93 };
  94
  95 /* Default configuration for logical memcpy */
  96 static struct stedma40_chan_cfg dma40_memcpy_conf_log = {
  97         .mode = STEDMA40_MODE_LOGICAL,
  98         .dir = DMA_MEM_TO_MEM,
  99
 100         .src_info.data_width = DMA_SLAVE_BUSWIDTH_1_BYTE,
 101         .src_info.psize = STEDMA40_PSIZE_LOG_1,
 102         .src_info.flow_ctrl = STEDMA40_NO_FLOW_CTRL,
 103
 104         .dst_info.data_width = DMA_SLAVE_BUSWIDTH_1_BYTE,
 105         .dst_info.psize = STEDMA40_PSIZE_LOG_1,
 106         .dst_info.flow_ctrl = STEDMA40_NO_FLOW_CTRL,
 107 };
 108
 109 /**
 110  * enum 40_command - The different commands and/or statuses.
 111  *
 112  * @D40_DMA_STOP: DMA channel command STOP or status STOPPED,
 113  * @D40_DMA_RUN: The DMA channel is RUNNING of the command RUN.
 114  * @D40_DMA_SUSPEND_REQ: Request the DMA to SUSPEND as soon as possible.
 115  * @D40_DMA_SUSPENDED: The DMA channel is SUSPENDED.
 116  */
 117 enum d40_command {
 118         D40_DMA_STOP            = 0,
 119         D40_DMA_RUN             = 1,
 120         D40_DMA_SUSPEND_REQ     = 2,
 121         D40_DMA_SUSPENDED       = 3
 122 };
 123
 124 /*
 125  * enum d40_events - The different Event Enables for the event lines.
 126  *
 127  * @D40_DEACTIVATE_EVENTLINE: De-activate Event line, stopping the logical chan.
 128  * @D40_ACTIVATE_EVENTLINE: Activate the Event line, to start a logical chan.
 129  * @D40_SUSPEND_REQ_EVENTLINE: Requesting for suspending a event line.
 130  * @D40_ROUND_EVENTLINE: Status check for event line.
 131  */
 132
 133 enum d40_events {
 134         D40_DEACTIVATE_EVENTLINE        = 0,
 135         D40_ACTIVATE_EVENTLINE          = 1,
 136         D40_SUSPEND_REQ_EVENTLINE       = 2,
 137         D40_ROUND_EVENTLINE             = 3
 138 };
 139
 140 /*
 141  * These are the registers that has to be saved and later restored
 142  * when the DMA hw is powered off.
 143  * TODO: Add save/restore of D40_DREG_GCC on dma40 v3 or later, if that works.
 144  */
 145 static u32 d40_backup_regs[] = {
 146         D40_DREG_LCPA,
 147         D40_DREG_LCLA,
 148         D40_DREG_PRMSE,
 149         D40_DREG_PRMSO,
 150         D40_DREG_PRMOE,
 151         D40_DREG_PRMOO,
 152 };
 153
 154 #define BACKUP_REGS_SZ ARRAY_SIZE(d40_backup_regs)
 155
 156 /*
 157  * since 9540 and 8540 has the same HW revision
 158  * use v4a for 9540 or ealier
 159  * use v4b for 8540 or later
 160  * HW revision:
 161  * DB8500ed has revision 0
 162  * DB8500v1 has revision 2
 163  * DB8500v2 has revision 3
 164  * AP9540v1 has revision 4
 165  * DB8540v1 has revision 4
 166  * TODO: Check if all these registers have to be saved/restored on dma40 v4a
 167  */
 168 static u32 d40_backup_regs_v4a[] = {
 169         D40_DREG_PSEG1,
 170         D40_DREG_PSEG2,
 171         D40_DREG_PSEG3,
 172         D40_DREG_PSEG4,
 173         D40_DREG_PCEG1,
 174         D40_DREG_PCEG2,
 175         D40_DREG_PCEG3,
 176         D40_DREG_PCEG4,
 177         D40_DREG_RSEG1,
 178         D40_DREG_RSEG2,
 179         D40_DREG_RSEG3,
 180         D40_DREG_RSEG4,
 181         D40_DREG_RCEG1,
 182         D40_DREG_RCEG2,
 183         D40_DREG_RCEG3,
 184         D40_DREG_RCEG4,
 185 };
 186
 187 #define BACKUP_REGS_SZ_V4A ARRAY_SIZE(d40_backup_regs_v4a)
 188
 189 static u32 d40_backup_regs_v4b[] = {
 190         D40_DREG_CPSEG1,
 191         D40_DREG_CPSEG2,
 192         D40_DREG_CPSEG3,
 193         D40_DREG_CPSEG4,
 194         D40_DREG_CPSEG5,
 195         D40_DREG_CPCEG1,
 196         D40_DREG_CPCEG2,
 197         D40_DREG_CPCEG3,
 198         D40_DREG_CPCEG4,
 199         D40_DREG_CPCEG5,
 200         D40_DREG_CRSEG1,
 201         D40_DREG_CRSEG2,
 202         D40_DREG_CRSEG3,
 203         D40_DREG_CRSEG4,
 204         D40_DREG_CRSEG5,
 205         D40_DREG_CRCEG1,
 206         D40_DREG_CRCEG2,
 207         D40_DREG_CRCEG3,
 208         D40_DREG_CRCEG4,
 209         D40_DREG_CRCEG5,
 210 };
 211
 212 #define BACKUP_REGS_SZ_V4B ARRAY_SIZE(d40_backup_regs_v4b)
 213
 214 static u32 d40_backup_regs_chan[] = {
 215         D40_CHAN_REG_SSCFG,
 216         D40_CHAN_REG_SSELT,
 217         D40_CHAN_REG_SSPTR,
 218         D40_CHAN_REG_SSLNK,
 219         D40_CHAN_REG_SDCFG,
 220         D40_CHAN_REG_SDELT,
 221         D40_CHAN_REG_SDPTR,
 222         D40_CHAN_REG_SDLNK,
 223 };
 224
 225 #define BACKUP_REGS_SZ_MAX ((BACKUP_REGS_SZ_V4A > BACKUP_REGS_SZ_V4B) ? \
 226                              BACKUP_REGS_SZ_V4A : BACKUP_REGS_SZ_V4B)
 227
 228 /**
 229  * struct d40_interrupt_lookup - lookup table for interrupt handler
 230  *
 231  * @src: Interrupt mask register.
 232  * @clr: Interrupt clear register.
 233  * @is_error: true if this is an error interrupt.
 234  * @offset: start delta in the lookup_log_chans in d40_base. If equals to
 235  * D40_PHY_CHAN, the lookup_phy_chans shall be used instead.
 236  */
 237 struct d40_interrupt_lookup {
 238         u32 src;
 239         u32 clr;
 240         bool is_error;
 241         int offset;
 242 };
 243
 244
 245 static struct d40_interrupt_lookup il_v4a[] = {
 246         {D40_DREG_LCTIS0, D40_DREG_LCICR0, false,  0},
 247         {D40_DREG_LCTIS1, D40_DREG_LCICR1, false, 32},
 248         {D40_DREG_LCTIS2, D40_DREG_LCICR2, false, 64},
 249         {D40_DREG_LCTIS3, D40_DREG_LCICR3, false, 96},
 250         {D40_DREG_LCEIS0, D40_DREG_LCICR0, true,   0},
 251         {D40_DREG_LCEIS1, D40_DREG_LCICR1, true,  32},
 252         {D40_DREG_LCEIS2, D40_DREG_LCICR2, true,  64},
 253         {D40_DREG_LCEIS3, D40_DREG_LCICR3, true,  96},
 254         {D40_DREG_PCTIS,  D40_DREG_PCICR,  false, D40_PHY_CHAN},
 255         {D40_DREG_PCEIS,  D40_DREG_PCICR,  true,  D40_PHY_CHAN},
 256 };
 257
 258 static struct d40_interrupt_lookup il_v4b[] = {
 259         {D40_DREG_CLCTIS1, D40_DREG_CLCICR1, false,  0},
 260         {D40_DREG_CLCTIS2, D40_DREG_CLCICR2, false, 32},
 261         {D40_DREG_CLCTIS3, D40_DREG_CLCICR3, false, 64},
 262         {D40_DREG_CLCTIS4, D40_DREG_CLCICR4, false, 96},
 263         {D40_DREG_CLCTIS5, D40_DREG_CLCICR5, false, 128},
 264         {D40_DREG_CLCEIS1, D40_DREG_CLCICR1, true,   0},
 265         {D40_DREG_CLCEIS2, D40_DREG_CLCICR2, true,  32},
 266         {D40_DREG_CLCEIS3, D40_DREG_CLCICR3, true,  64},
 267         {D40_DREG_CLCEIS4, D40_DREG_CLCICR4, true,  96},
 268         {D40_DREG_CLCEIS5, D40_DREG_CLCICR5, true,  128},
 269         {D40_DREG_CPCTIS,  D40_DREG_CPCICR,  false, D40_PHY_CHAN},
 270         {D40_DREG_CPCEIS,  D40_DREG_CPCICR,  true,  D40_PHY_CHAN},
 271 };
 272
 273 /**
 274  * struct d40_reg_val - simple lookup struct
 275  *
 276  * @reg: The register.
 277  * @val: The value that belongs to the register in reg.
 278  */
 279 struct d40_reg_val {
 280         unsigned int reg;
 281         unsigned int val;
 282 };
 283
 284 static __initdata struct d40_reg_val dma_init_reg_v4a[] = {
 285         /* Clock every part of the DMA block from start */
 286         { .reg = D40_DREG_GCC,    .val = D40_DREG_GCC_ENABLE_ALL},
 287
 288         /* Interrupts on all logical channels */
 289         { .reg = D40_DREG_LCMIS0, .val = 0xFFFFFFFF},
 290         { .reg = D40_DREG_LCMIS1, .val = 0xFFFFFFFF},
 291         { .reg = D40_DREG_LCMIS2, .val = 0xFFFFFFFF},
 292         { .reg = D40_DREG_LCMIS3, .val = 0xFFFFFFFF},
 293         { .reg = D40_DREG_LCICR0, .val = 0xFFFFFFFF},
 294         { .reg = D40_DREG_LCICR1, .val = 0xFFFFFFFF},
 295         { .reg = D40_DREG_LCICR2, .val = 0xFFFFFFFF},
 296         { .reg = D40_DREG_LCICR3, .val = 0xFFFFFFFF},
 297         { .reg = D40_DREG_LCTIS0, .val = 0xFFFFFFFF},
 298         { .reg = D40_DREG_LCTIS1, .val = 0xFFFFFFFF},
 299         { .reg = D40_DREG_LCTIS2, .val = 0xFFFFFFFF},
 300         { .reg = D40_DREG_LCTIS3, .val = 0xFFFFFFFF}
 301 };
 302 static __initdata struct d40_reg_val dma_init_reg_v4b[] = {
 303         /* Clock every part of the DMA block from start */
 304         { .reg = D40_DREG_GCC,    .val = D40_DREG_GCC_ENABLE_ALL},
 305
 306         /* Interrupts on all logical channels */
 307         { .reg = D40_DREG_CLCMIS1, .val = 0xFFFFFFFF},
 308         { .reg = D40_DREG_CLCMIS2, .val = 0xFFFFFFFF},
 309         { .reg = D40_DREG_CLCMIS3, .val = 0xFFFFFFFF},
 310         { .reg = D40_DREG_CLCMIS4, .val = 0xFFFFFFFF},
 311         { .reg = D40_DREG_CLCMIS5, .val = 0xFFFFFFFF},
 312         { .reg = D40_DREG_CLCICR1, .val = 0xFFFFFFFF},
 313         { .reg = D40_DREG_CLCICR2, .val = 0xFFFFFFFF},
 314         { .reg = D40_DREG_CLCICR3, .val = 0xFFFFFFFF},
 315         { .reg = D40_DREG_CLCICR4, .val = 0xFFFFFFFF},
 316         { .reg = D40_DREG_CLCICR5, .val = 0xFFFFFFFF},
 317         { .reg = D40_DREG_CLCTIS1, .val = 0xFFFFFFFF},
 318         { .reg = D40_DREG_CLCTIS2, .val = 0xFFFFFFFF},
 319         { .reg = D40_DREG_CLCTIS3, .val = 0xFFFFFFFF},
 320         { .reg = D40_DREG_CLCTIS4, .val = 0xFFFFFFFF},
 321         { .reg = D40_DREG_CLCTIS5, .val = 0xFFFFFFFF}
 322 };
 323
 324 /**
 325  * struct d40_lli_pool - Structure for keeping LLIs in memory
 326  *
 327  * @base: Pointer to memory area when the pre_alloc_lli's are not large
 328  * enough, IE bigger than the most common case, 1 dst and 1 src. NULL if
 329  * pre_alloc_lli is used.
 330  * @dma_addr: DMA address, if mapped
 331  * @size: The size in bytes of the memory at base or the size of pre_alloc_lli.
 332  * @pre_alloc_lli: Pre allocated area for the most common case of transfers,
 333  * one buffer to one buffer.
 334  */
 335 struct d40_lli_pool {
 336         void    *base;
 337         int      size;
 338         dma_addr_t      dma_addr;
 339         /* Space for dst and src, plus an extra for padding */
 340         u8       pre_alloc_lli[3 * sizeof(struct d40_phy_lli)];
 341 };
 342
 343 /**
 344  * struct d40_desc - A descriptor is one DMA job.
 345  *
 346  * @lli_phy: LLI settings for physical channel. Both src and dst=
 347  * points into the lli_pool, to base if lli_len > 1 or to pre_alloc_lli if
 348  * lli_len equals one.
 349  * @lli_log: Same as above but for logical channels.
 350  * @lli_pool: The pool with two entries pre-allocated.
 351  * @lli_len: Number of llis of current descriptor.
 352  * @lli_current: Number of transferred llis.
 353  * @lcla_alloc: Number of LCLA entries allocated.
 354  * @txd: DMA engine struct. Used for among other things for communication
 355  * during a transfer.
 356  * @node: List entry.
 357  * @is_in_client_list: true if the client owns this descriptor.
 358  * @cyclic: true if this is a cyclic job
 359  *
 360  * This descriptor is used for both logical and physical transfers.
 361  */
 362 struct d40_desc {
 363         /* LLI physical */
 364         struct d40_phy_lli_bidir         lli_phy;
 365         /* LLI logical */
 366         struct d40_log_lli_bidir         lli_log;
 367
 368         struct d40_lli_pool              lli_pool;
 369         int                              lli_len;
 370         int                              lli_current;
 371         int                              lcla_alloc;
 372
 373         struct dma_async_tx_descriptor   txd;
 374         struct list_head                 node;
 375
 376         bool                             is_in_client_list;
 377         bool                             cyclic;
 378 };
 379
 380 /**
 381  * struct d40_lcla_pool - LCLA pool settings and data.
 382  *
 383  * @base: The virtual address of LCLA. 18 bit aligned.
 384  * @base_unaligned: The orignal kmalloc pointer, if kmalloc is used.
 385  * This pointer is only there for clean-up on error.
 386  * @pages: The number of pages needed for all physical channels.
 387  * Only used later for clean-up on error
 388  * @lock: Lock to protect the content in this struct.
 389  * @alloc_map: big map over which LCLA entry is own by which job.
 390  */
 391 struct d40_lcla_pool {
 392         void            *base;
 393         dma_addr_t      dma_addr;
 394         void            *base_unaligned;
 395         int              pages;
 396         spinlock_t       lock;
 397         struct d40_desc **alloc_map;
 398 };
 399
 400 /**
 401  * struct d40_phy_res - struct for handling eventlines mapped to physical
 402  * channels.
 403  *
 404  * @lock: A lock protection this entity.
 405  * @reserved: True if used by secure world or otherwise.
 406  * @num: The physical channel number of this entity.
 407  * @allocated_src: Bit mapped to show which src event line's are mapped to
 408  * this physical channel. Can also be free or physically allocated.
 409  * @allocated_dst: Same as for src but is dst.
 410  * allocated_dst and allocated_src uses the D40_ALLOC* defines as well as
 411  * event line number.
 412  * @use_soft_lli: To mark if the linked lists of channel are managed by SW.
 413  */
 414 struct d40_phy_res {
 415         spinlock_t lock;
 416         bool       reserved;
 417         int        num;
 418         u32        allocated_src;
 419         u32        allocated_dst;
 420         bool       use_soft_lli;
 421 };
 422
 423 struct d40_base;
 424
 425 /**
 426  * struct d40_chan - Struct that describes a channel.
 427  *
 428  * @lock: A spinlock to protect this struct.
 429  * @log_num: The logical number, if any of this channel.
 430  * @pending_tx: The number of pending transfers. Used between interrupt handler
 431  * and tasklet.
 432  * @busy: Set to true when transfer is ongoing on this channel.
 433  * @phy_chan: Pointer to physical channel which this instance runs on. If this
 434  * point is NULL, then the channel is not allocated.
 435  * @chan: DMA engine handle.
 436  * @tasklet: Tasklet that gets scheduled from interrupt context to complete a
 437  * transfer and call client callback.
 438  * @client: Cliented owned descriptor list.
 439  * @pending_queue: Submitted jobs, to be issued by issue_pending()
 440  * @active: Active descriptor.
 441  * @done: Completed jobs
 442  * @queue: Queued jobs.
 443  * @prepare_queue: Prepared jobs.
 444  * @dma_cfg: The client configuration of this dma channel.
 445  * @configured: whether the dma_cfg configuration is valid
 446  * @base: Pointer to the device instance struct.
 447  * @src_def_cfg: Default cfg register setting for src.
 448  * @dst_def_cfg: Default cfg register setting for dst.
 449  * @log_def: Default logical channel settings.
 450  * @lcpa: Pointer to dst and src lcpa settings.
 451  * @runtime_addr: runtime configured address.
 452  * @runtime_direction: runtime configured direction.
 453  *
 454  * This struct can either "be" a logical or a physical channel.
 455  */
 456 struct d40_chan {
 457         spinlock_t                       lock;
 458         int                              log_num;
 459         int                              pending_tx;
 460         bool                             busy;
 461         struct d40_phy_res              *phy_chan;
 462         struct dma_chan                  chan;
 463         struct tasklet_struct            tasklet;
 464         struct list_head                 client;
 465         struct list_head                 pending_queue;
 466         struct list_head                 active;
 467         struct list_head                 done;
 468         struct list_head                 queue;
 469         struct list_head                 prepare_queue;
 470         struct stedma40_chan_cfg         dma_cfg;
 471         bool                             configured;
 472         struct d40_base                 *base;
 473         /* Default register configurations */
 474         u32                              src_def_cfg;
 475         u32                              dst_def_cfg;
 476         struct d40_def_lcsp              log_def;
 477         struct d40_log_lli_full         *lcpa;
 478         /* Runtime reconfiguration */
 479         dma_addr_t                      runtime_addr;
 480         enum dma_transfer_direction     runtime_direction;
 481 };
 482
 483 /**
 484  * struct d40_gen_dmac - generic values to represent u8500/u8540 DMA
 485  * controller
 486  *
 487  * @backup: the pointer to the registers address array for backup
 488  * @backup_size: the size of the registers address array for backup
 489  * @realtime_en: the realtime enable register
 490  * @realtime_clear: the realtime clear register
 491  * @high_prio_en: the high priority enable register
 492  * @high_prio_clear: the high priority clear register
 493  * @interrupt_en: the interrupt enable register
 494  * @interrupt_clear: the interrupt clear register
 495  * @il: the pointer to struct d40_interrupt_lookup
 496  * @il_size: the size of d40_interrupt_lookup array
 497  * @init_reg: the pointer to the struct d40_reg_val
 498  * @init_reg_size: the size of d40_reg_val array
 499  */
 500 struct d40_gen_dmac {
 501         u32                             *backup;
 502         u32                              backup_size;
 503         u32                              realtime_en;
 504         u32                              realtime_clear;
 505         u32                              high_prio_en;
 506         u32                              high_prio_clear;
 507         u32                              interrupt_en;
 508         u32                              interrupt_clear;
 509         struct d40_interrupt_lookup     *il;
 510         u32                              il_size;
 511         struct d40_reg_val              *init_reg;
 512         u32                              init_reg_size;
 513 };
 514
 515 /**
 516  * struct d40_base - The big global struct, one for each probe'd instance.
 517  *
 518  * @interrupt_lock: Lock used to make sure one interrupt is handle a time.
 519  * @execmd_lock: Lock for execute command usage since several channels share
 520  * the same physical register.
 521  * @dev: The device structure.
 522  * @virtbase: The virtual base address of the DMA's register.
 523  * @rev: silicon revision detected.
 524  * @clk: Pointer to the DMA clock structure.
 525  * @phy_start: Physical memory start of the DMA registers.
 526  * @phy_size: Size of the DMA register map.
 527  * @irq: The IRQ number.
 528  * @num_memcpy_chans: The number of channels used for memcpy (mem-to-mem
 529  * transfers).
 530  * @num_phy_chans: The number of physical channels. Read from HW. This
 531  * is the number of available channels for this driver, not counting "Secure
 532  * mode" allocated physical channels.
 533  * @num_log_chans: The number of logical channels. Calculated from
 534  * num_phy_chans.
 535  * @dma_both: dma_device channels that can do both memcpy and slave transfers.
 536  * @dma_slave: dma_device channels that can do only do slave transfers.
 537  * @dma_memcpy: dma_device channels that can do only do memcpy transfers.
 538  * @phy_chans: Room for all possible physical channels in system.
 539  * @log_chans: Room for all possible logical channels in system.
 540  * @lookup_log_chans: Used to map interrupt number to logical channel. Points
 541  * to log_chans entries.
 542  * @lookup_phy_chans: Used to map interrupt number to physical channel. Points
 543  * to phy_chans entries.
 544  * @plat_data: Pointer to provided platform_data which is the driver
 545  * configuration.
 546  * @lcpa_regulator: Pointer to hold the regulator for the esram bank for lcla.
 547  * @phy_res: Vector containing all physical channels.
 548  * @lcla_pool: lcla pool settings and data.
 549  * @lcpa_base: The virtual mapped address of LCPA.
 550  * @phy_lcpa: The physical address of the LCPA.
 551  * @lcpa_size: The size of the LCPA area.
 552  * @desc_slab: cache for descriptors.
 553  * @reg_val_backup: Here the values of some hardware registers are stored
 554  * before the DMA is powered off. They are restored when the power is back on.
 555  * @reg_val_backup_v4: Backup of registers that only exits on dma40 v3 and
 556  * later
 557  * @reg_val_backup_chan: Backup data for standard channel parameter registers.
 558  * @gcc_pwr_off_mask: Mask to maintain the channels that can be turned off.
 559  * @initialized: true if the dma has been initialized
 560  * @gen_dmac: the struct for generic registers values to represent u8500/8540
 561  * DMA controller
 562  */
 563 struct d40_base {
 564         spinlock_t                       interrupt_lock;
 565         spinlock_t                       execmd_lock;
 566         struct device                    *dev;
 567         void __iomem                     *virtbase;
 568         u8                                rev:4;
 569         struct clk                       *clk;
 570         phys_addr_t                       phy_start;
 571         resource_size_t                   phy_size;
 572         int                               irq;
 573         int                               num_memcpy_chans;
 574         int                               num_phy_chans;
 575         int                               num_log_chans;
 576         struct device_dma_parameters      dma_parms;
 577         struct dma_device                 dma_both;
 578         struct dma_device                 dma_slave;
 579         struct dma_device                 dma_memcpy;
 580         struct d40_chan                  *phy_chans;
 581         struct d40_chan                  *log_chans;
 582         struct d40_chan                 **lookup_log_chans;
 583         struct d40_chan                 **lookup_phy_chans;
 584         struct stedma40_platform_data    *plat_data;
 585         struct regulator                 *lcpa_regulator;
 586         /* Physical half channels */
 587         struct d40_phy_res               *phy_res;
 588         struct d40_lcla_pool              lcla_pool;
 589         void                             *lcpa_base;
 590         dma_addr_t                        phy_lcpa;
 591         resource_size_t                   lcpa_size;
 592         struct kmem_cache                *desc_slab;
 593         u32                               reg_val_backup[BACKUP_REGS_SZ];
 594         u32                               reg_val_backup_v4[BACKUP_REGS_SZ_MAX];
 595         u32                              *reg_val_backup_chan;
 596         u16                               gcc_pwr_off_mask;
 597         bool                              initialized;
 598         struct d40_gen_dmac               gen_dmac;
 599 };
 600
 601 static struct device *chan2dev(struct d40_chan *d40c)
 602 {
 603         return &d40c->chan.dev->device;
 604 }
 605
 606 static bool chan_is_physical(struct d40_chan *chan)
 607 {
 608         return chan->log_num == D40_PHY_CHAN;
 609 }
 610
 611 static bool chan_is_logical(struct d40_chan *chan)
 612 {
 613         return !chan_is_physical(chan);
 614 }
 615
 616 static void __iomem *chan_base(struct d40_chan *chan)
 617 {
 618         return chan->base->virtbase + D40_DREG_PCBASE +
 619                chan->phy_chan->num * D40_DREG_PCDELTA;
 620 }
 621
 622 #define d40_err(dev, format, arg...)            \
 623         dev_err(dev, "[%s] " format, __func__, ## arg)
 624
 625 #define chan_err(d40c, format, arg...)          \
 626         d40_err(chan2dev(d40c), format, ## arg)
 627
 628 static int d40_pool_lli_alloc(struct d40_chan *d40c, struct d40_desc *d40d,
 629                               int lli_len)
 630 {
 631         bool is_log = chan_is_logical(d40c);
 632         u32 align;
 633         void *base;
 634
 635         if (is_log)
 636                 align = sizeof(struct d40_log_lli);
 637         else
 638                 align = sizeof(struct d40_phy_lli);
 639
 640         if (lli_len == 1) {
 641                 base = d40d->lli_pool.pre_alloc_lli;
 642                 d40d->lli_pool.size = sizeof(d40d->lli_pool.pre_alloc_lli);
 643                 d40d->lli_pool.base = NULL;
 644         } else {
 645                 d40d->lli_pool.size = lli_len * 2 * align;
 646
 647                 base = kmalloc(d40d->lli_pool.size + align, GFP_NOWAIT);
 648                 d40d->lli_pool.base = base;
 649
 650                 if (d40d->lli_pool.base == NULL)
 651                         return -ENOMEM;
 652         }
 653
 654         if (is_log) {
 655                 d40d->lli_log.src = PTR_ALIGN(base, align);
 656                 d40d->lli_log.dst = d40d->lli_log.src + lli_len;
 657
 658                 d40d->lli_pool.dma_addr = 0;
 659         } else {
 660                 d40d->lli_phy.src = PTR_ALIGN(base, align);
 661                 d40d->lli_phy.dst = d40d->lli_phy.src + lli_len;
 662
 663                 d40d->lli_pool.dma_addr = dma_map_single(d40c->base->dev,
 664                                                          d40d->lli_phy.src,
 665                                                          d40d->lli_pool.size,
 666                                                          DMA_TO_DEVICE);
 667
 668                 if (dma_mapping_error(d40c->base->dev,
 669                                       d40d->lli_pool.dma_addr)) {
 670                         kfree(d40d->lli_pool.base);
 671                         d40d->lli_pool.base = NULL;
 672                         d40d->lli_pool.dma_addr = 0;
 673                         return -ENOMEM;
 674                 }
 675         }
 676
 677         return 0;
 678 }
 679
 680 static void d40_pool_lli_free(struct d40_chan *d40c, struct d40_desc *d40d)
 681 {
 682         if (d40d->lli_pool.dma_addr)
 683                 dma_unmap_single(d40c->base->dev, d40d->lli_pool.dma_addr,
 684                                  d40d->lli_pool.size, DMA_TO_DEVICE);
 685
 686         kfree(d40d->lli_pool.base);
 687         d40d->lli_pool.base = NULL;
 688         d40d->lli_pool.size = 0;
 689         d40d->lli_log.src = NULL;
 690         d40d->lli_log.dst = NULL;
 691         d40d->lli_phy.src = NULL;
 692         d40d->lli_phy.dst = NULL;
 693 }
 694
 695 static int d40_lcla_alloc_one(struct d40_chan *d40c,
 696                               struct d40_desc *d40d)
 697 {
 698         unsigned long flags;
 699         int i;
 700         int ret = -EINVAL;
 701
 702         spin_lock_irqsave(&d40c->base->lcla_pool.lock, flags);
 703
 704         /*
 705          * Allocate both src and dst at the same time, therefore the half
 706          * start on 1 since 0 can't be used since zero is used as end marker.
 707          */
 708         for (i = 1 ; i < D40_LCLA_LINK_PER_EVENT_GRP / 2; i++) {
 709                 int idx = d40c->phy_chan->num * D40_LCLA_LINK_PER_EVENT_GRP + i;
 710
 711                 if (!d40c->base->lcla_pool.alloc_map[idx]) {
 712                         d40c->base->lcla_pool.alloc_map[idx] = d40d;
 713                         d40d->lcla_alloc++;
 714                         ret = i;
 715                         break;
 716                 }
 717         }
 718
 719         spin_unlock_irqrestore(&d40c->base->lcla_pool.lock, flags);
 720
 721         return ret;
 722 }
 723
 724 static int d40_lcla_free_all(struct d40_chan *d40c,
 725                              struct d40_desc *d40d)
 726 {
 727         unsigned long flags;
 728         int i;
 729         int ret = -EINVAL;
 730
 731         if (chan_is_physical(d40c))
 732                 return 0;
 733
 734         spin_lock_irqsave(&d40c->base->lcla_pool.lock, flags);
 735
 736         for (i = 1 ; i < D40_LCLA_LINK_PER_EVENT_GRP / 2; i++) {
 737                 int idx = d40c->phy_chan->num * D40_LCLA_LINK_PER_EVENT_GRP + i;
 738
 739                 if (d40c->base->lcla_pool.alloc_map[idx] == d40d) {
 740                         d40c->base->lcla_pool.alloc_map[idx] = NULL;
 741                         d40d->lcla_alloc--;
 742                         if (d40d->lcla_alloc == 0) {
 743                                 ret = 0;
 744                                 break;
 745                         }
 746                 }
 747         }
 748
 749         spin_unlock_irqrestore(&d40c->base->lcla_pool.lock, flags);
 750
 751         return ret;
 752
 753 }
 754
 755 static void d40_desc_remove(struct d40_desc *d40d)
 756 {
 757         list_del(&d40d->node);
 758 }
 759
 760 static struct d40_desc *d40_desc_get(struct d40_chan *d40c)
 761 {
 762         struct d40_desc *desc = NULL;
 763
 764         if (!list_empty(&d40c->client)) {
 765                 struct d40_desc *d;
 766                 struct d40_desc *_d;
 767
 768                 list_for_each_entry_safe(d, _d, &d40c->client, node) {
 769                         if (async_tx_test_ack(&d->txd)) {
 770                                 d40_desc_remove(d);
 771                                 desc = d;
 772                                 memset(desc, 0, sizeof(*desc));
 773                                 break;
 774                         }
 775                 }
 776         }
 777
 778         if (!desc)
 779                 desc = kmem_cache_zalloc(d40c->base->desc_slab, GFP_NOWAIT);
 780
 781         if (desc)
 782                 INIT_LIST_HEAD(&desc->node);
 783
 784         return desc;
 785 }
 786
 787 static void d40_desc_free(struct d40_chan *d40c, struct d40_desc *d40d)
 788 {
 789
 790         d40_pool_lli_free(d40c, d40d);
 791         d40_lcla_free_all(d40c, d40d);
 792         kmem_cache_free(d40c->base->desc_slab, d40d);
 793 }
 794
 795 static void d40_desc_submit(struct d40_chan *d40c, struct d40_desc *desc)
 796 {
 797         list_add_tail(&desc->node, &d40c->active);
 798 }
 799
 800 static void d40_phy_lli_load(struct d40_chan *chan, struct d40_desc *desc)
 801 {
 802         struct d40_phy_lli *lli_dst = desc->lli_phy.dst;
 803         struct d40_phy_lli *lli_src = desc->lli_phy.src;
 804         void __iomem *base = chan_base(chan);
 805
 806         writel(lli_src->reg_cfg, base + D40_CHAN_REG_SSCFG);
 807         writel(lli_src->reg_elt, base + D40_CHAN_REG_SSELT);
 808         writel(lli_src->reg_ptr, base + D40_CHAN_REG_SSPTR);
 809         writel(lli_src->reg_lnk, base + D40_CHAN_REG_SSLNK);
 810
 811         writel(lli_dst->reg_cfg, base + D40_CHAN_REG_SDCFG);
 812         writel(lli_dst->reg_elt, base + D40_CHAN_REG_SDELT);
 813         writel(lli_dst->reg_ptr, base + D40_CHAN_REG_SDPTR);
 814         writel(lli_dst->reg_lnk, base + D40_CHAN_REG_SDLNK);
 815 }
 816
 817 static void d40_desc_done(struct d40_chan *d40c, struct d40_desc *desc)
 818 {
 819         list_add_tail(&desc->node, &d40c->done);
 820 }
 821
 822 static void d40_log_lli_to_lcxa(struct d40_chan *chan, struct d40_desc *desc)
 823 {
 824         struct d40_lcla_pool *pool = &chan->base->lcla_pool;
 825         struct d40_log_lli_bidir *lli = &desc->lli_log;
 826         int lli_current = desc->lli_current;
 827         int lli_len = desc->lli_len;
 828         bool cyclic = desc->cyclic;
 829         int curr_lcla = -EINVAL;
 830         int first_lcla = 0;
 831         bool use_esram_lcla = chan->base->plat_data->use_esram_lcla;
 832         bool linkback;
 833
 834         /*
 835          * We may have partially running cyclic transfers, in case we did't get
 836          * enough LCLA entries.
 837          */
 838         linkback = cyclic && lli_current == 0;
 839
 840         /*
 841          * For linkback, we need one LCLA even with only one link, because we
 842          * can't link back to the one in LCPA space
 843          */
 844         if (linkback || (lli_len - lli_current > 1)) {
 845                 /*
 846                  * If the channel is expected to use only soft_lli don't
 847                  * allocate a lcla. This is to avoid a HW issue that exists
 848                  * in some controller during a peripheral to memory transfer
 849                  * that uses linked lists.
 850                  */
 851                 if (!(chan->phy_chan->use_soft_lli &&
 852                         chan->dma_cfg.dir == DMA_DEV_TO_MEM))
 853                         curr_lcla = d40_lcla_alloc_one(chan, desc);
 854
 855                 first_lcla = curr_lcla;
 856         }
 857
 858         /*
 859          * For linkback, we normally load the LCPA in the loop since we need to
 860          * link it to the second LCLA and not the first.  However, if we
 861          * couldn't even get a first LCLA, then we have to run in LCPA and
 862          * reload manually.
 863          */
 864         if (!linkback || curr_lcla == -EINVAL) {
 865                 unsigned int flags = 0;
 866
 867                 if (curr_lcla == -EINVAL)
 868                         flags |= LLI_TERM_INT;
 869
 870                 d40_log_lli_lcpa_write(chan->lcpa,
 871                                        &lli->dst[lli_current],
 872                                        &lli->src[lli_current],
 873                                        curr_lcla,
 874                                        flags);
 875                 lli_current++;
 876         }
 877
 878         if (curr_lcla < 0)
 879                 goto out;
 880
 881         for (; lli_current < lli_len; lli_current++) {
 882                 unsigned int lcla_offset = chan->phy_chan->num * 1024 +
 883                                            8 * curr_lcla * 2;
 884                 struct d40_log_lli *lcla = pool->base + lcla_offset;
 885                 unsigned int flags = 0;
 886                 int next_lcla;
 887
 888                 if (lli_current + 1 < lli_len)
 889                         next_lcla = d40_lcla_alloc_one(chan, desc);
 890                 else
 891                         next_lcla = linkback ? first_lcla : -EINVAL;
 892
 893                 if (cyclic || next_lcla == -EINVAL)
 894                         flags |= LLI_TERM_INT;
 895
 896                 if (linkback && curr_lcla == first_lcla) {
 897                         /* First link goes in both LCPA and LCLA */
 898                         d40_log_lli_lcpa_write(chan->lcpa,
 899                                                &lli->dst[lli_current],
 900                                                &lli->src[lli_current],
 901                                                next_lcla, flags);
 902                 }
 903
 904                 /*
 905                  * One unused LCLA in the cyclic case if the very first
 906                  * next_lcla fails...
 907                  */
 908                 d40_log_lli_lcla_write(lcla,
 909                                        &lli->dst[lli_current],
 910                                        &lli->src[lli_current],
 911                                        next_lcla, flags);
 912
 913                 /*
 914                  * Cache maintenance is not needed if lcla is
 915                  * mapped in esram
 916                  */
 917                 if (!use_esram_lcla) {
 918                         dma_sync_single_range_for_device(chan->base->dev,
 919                                                 pool->dma_addr, lcla_offset,
 920                                                 2 * sizeof(struct d40_log_lli),
 921                                                 DMA_TO_DEVICE);
 922                 }
 923                 curr_lcla = next_lcla;
 924
 925                 if (curr_lcla == -EINVAL || curr_lcla == first_lcla) {
 926                         lli_current++;
 927                         break;
 928                 }
 929         }
 930
 931 out:
 932         desc->lli_current = lli_current;
 933 }
 934
 935 static void d40_desc_load(struct d40_chan *d40c, struct d40_desc *d40d)
 936 {
 937         if (chan_is_physical(d40c)) {
 938                 d40_phy_lli_load(d40c, d40d);
 939                 d40d->lli_current = d40d->lli_len;
 940         } else
 941                 d40_log_lli_to_lcxa(d40c, d40d);
 942 }
 943
 944 static struct d40_desc *d40_first_active_get(struct d40_chan *d40c)
 945 {
 946         struct d40_desc *d;
 947
 948         if (list_empty(&d40c->active))
 949                 return NULL;
 950
 951         d = list_first_entry(&d40c->active,
 952                              struct d40_desc,
 953                              node);
 954         return d;
 955 }
 956
 957 /* remove desc from current queue and add it to the pending_queue */
 958 static void d40_desc_queue(struct d40_chan *d40c, struct d40_desc *desc)
 959 {
 960         d40_desc_remove(desc);
 961         desc->is_in_client_list = false;
 962         list_add_tail(&desc->node, &d40c->pending_queue);
 963 }
 964
 965 static struct d40_desc *d40_first_pending(struct d40_chan *d40c)
 966 {
 967         struct d40_desc *d;
 968
 969         if (list_empty(&d40c->pending_queue))
 970                 return NULL;
 971
 972         d = list_first_entry(&d40c->pending_queue,
 973                              struct d40_desc,
 974                              node);
 975         return d;
 976 }
 977
 978 static struct d40_desc *d40_first_queued(struct d40_chan *d40c)
 979 {
 980         struct d40_desc *d;
 981
 982         if (list_empty(&d40c->queue))
 983                 return NULL;
 984
 985         d = list_first_entry(&d40c->queue,
 986                              struct d40_desc,
 987                              node);
 988         return d;
 989 }
 990
 991 static struct d40_desc *d40_first_done(struct d40_chan *d40c)
 992 {
 993         if (list_empty(&d40c->done))
 994                 return NULL;
 995
 996         return list_first_entry(&d40c->done, struct d40_desc, node);
 997 }
 998
 999 static int d40_psize_2_burst_size(bool is_log, int psize)
1000 {
1001         if (is_log) {
1002                 if (psize == STEDMA40_PSIZE_LOG_1)
1003                         return 1;
1004         } else {
1005                 if (psize == STEDMA40_PSIZE_PHY_1)
1006                         return 1;
1007         }
1008
1009         return 2 << psize;
1010 }
1011
1012 /*
1013  * The dma only supports transmitting packages up to
1014  * STEDMA40_MAX_SEG_SIZE * data_width, where data_width is stored in Bytes.
1015  *
1016  * Calculate the total number of dma elements required to send the entire sg list.
1017  */
1018 static int d40_size_2_dmalen(int size, u32 data_width1, u32 data_width2)
1019 {
1020         int dmalen;
1021         u32 max_w = max(data_width1, data_width2);
1022         u32 min_w = min(data_width1, data_width2);
1023         u32 seg_max = ALIGN(STEDMA40_MAX_SEG_SIZE * min_w, max_w);
1024
1025         if (seg_max > STEDMA40_MAX_SEG_SIZE)
1026                 seg_max -= max_w;
1027
1028         if (!IS_ALIGNED(size, max_w))
1029                 return -EINVAL;
1030
1031         if (size <= seg_max)
1032                 dmalen = 1;
1033         else {
1034                 dmalen = size / seg_max;
1035                 if (dmalen * seg_max < size)
1036                         dmalen++;
1037         }
1038         return dmalen;
1039 }
1040
1041 static int d40_sg_2_dmalen(struct scatterlist *sgl, int sg_len,
1042                            u32 data_width1, u32 data_width2)
1043 {
1044         struct scatterlist *sg;
1045         int i;
1046         int len = 0;
1047         int ret;
1048
1049         for_each_sg(sgl, sg, sg_len, i) {
1050                 ret = d40_size_2_dmalen(sg_dma_len(sg),
1051                                         data_width1, data_width2);
1052                 if (ret < 0)
1053                         return ret;
1054                 len += ret;
1055         }
1056         return len;
1057 }
1058
1059
1060 #ifdef CONFIG_PM
1061 static void dma40_backup(void __iomem *baseaddr, u32 *backup,
1062                          u32 *regaddr, int num, bool save)
1063 {
1064         int i;
1065
1066         for (i = 0; i < num; i++) {
1067                 void __iomem *addr = baseaddr + regaddr[i];
1068
1069                 if (save)
1070                         backup[i] = readl_relaxed(addr);
1071                 else
1072                         writel_relaxed(backup[i], addr);
1073         }
1074 }
1075
1076 static void d40_save_restore_registers(struct d40_base *base, bool save)
1077 {
1078         int i;
1079
1080         /* Save/Restore channel specific registers */
1081         for (i = 0; i < base->num_phy_chans; i++) {
1082                 void __iomem *addr;
1083                 int idx;
1084
1085                 if (base->phy_res[i].reserved)
1086                         continue;
1087
1088                 addr = base->virtbase + D40_DREG_PCBASE + i * D40_DREG_PCDELTA;
1089                 idx = i * ARRAY_SIZE(d40_backup_regs_chan);
1090
1091                 dma40_backup(addr, &base->reg_val_backup_chan[idx],
1092                              d40_backup_regs_chan,
1093                              ARRAY_SIZE(d40_backup_regs_chan),
1094                              save);
1095         }
1096
1097         /* Save/Restore global registers */
1098         dma40_backup(base->virtbase, base->reg_val_backup,
1099                      d40_backup_regs, ARRAY_SIZE(d40_backup_regs),
1100                      save);
1101
1102         /* Save/Restore registers only existing on dma40 v3 and later */
1103         if (base->gen_dmac.backup)
1104                 dma40_backup(base->virtbase, base->reg_val_backup_v4,
1105                              base->gen_dmac.backup,
1106                         base->gen_dmac.backup_size,
1107                         save);
1108 }
1109 #else
1110 static void d40_save_restore_registers(struct d40_base *base, bool save)
1111 {
1112 }
1113 #endif
1114
1115 static int __d40_execute_command_phy(struct d40_chan *d40c,
1116                                      enum d40_command command)
1117 {
1118         u32 status;
1119         int i;
1120         void __iomem *active_reg;
1121         int ret = 0;
1122         unsigned long flags;
1123         u32 wmask;
1124
1125         if (command == D40_DMA_STOP) {
1126                 ret = __d40_execute_command_phy(d40c, D40_DMA_SUSPEND_REQ);
1127                 if (ret)
1128                         return ret;
1129         }
1130
1131         spin_lock_irqsave(&d40c->base->execmd_lock, flags);
1132
1133         if (d40c->phy_chan->num % 2 == 0)
1134                 active_reg = d40c->base->virtbase + D40_DREG_ACTIVE;
1135         else
1136                 active_reg = d40c->base->virtbase + D40_DREG_ACTIVO;
1137
1138         if (command == D40_DMA_SUSPEND_REQ) {
1139                 status = (readl(active_reg) &
1140                           D40_CHAN_POS_MASK(d40c->phy_chan->num)) >>
1141                         D40_CHAN_POS(d40c->phy_chan->num);
1142
1143                 if (status == D40_DMA_SUSPENDED || status == D40_DMA_STOP)
1144                         goto done;
1145         }
1146
1147         wmask = 0xffffffff & ~(D40_CHAN_POS_MASK(d40c->phy_chan->num));
1148         writel(wmask | (command << D40_CHAN_POS(d40c->phy_chan->num)),
1149                active_reg);
1150
1151         if (command == D40_DMA_SUSPEND_REQ) {
1152
1153                 for (i = 0 ; i < D40_SUSPEND_MAX_IT; i++) {
1154                         status = (readl(active_reg) &
1155                                   D40_CHAN_POS_MASK(d40c->phy_chan->num)) >>
1156                                 D40_CHAN_POS(d40c->phy_chan->num);
1157
1158                         cpu_relax();
1159                         /*
1160                          * Reduce the number of bus accesses while
1161                          * waiting for the DMA to suspend.
1162                          */
1163                         udelay(3);
1164
1165                         if (status == D40_DMA_STOP ||
1166                             status == D40_DMA_SUSPENDED)
1167                                 break;
1168                 }
1169
1170                 if (i == D40_SUSPEND_MAX_IT) {
1171                         chan_err(d40c,
1172                                 "unable to suspend the chl %d (log: %d) status %x\n",
1173                                 d40c->phy_chan->num, d40c->log_num,
1174                                 status);
1175                         dump_stack();
1176                         ret = -EBUSY;
1177                 }
1178
1179         }
1180 done:
1181         spin_unlock_irqrestore(&d40c->base->execmd_lock, flags);
1182         return ret;
1183 }
1184
1185 static void d40_term_all(struct d40_chan *d40c)
1186 {
1187         struct d40_desc *d40d;
1188         struct d40_desc *_d;
1189
1190         /* Release completed descriptors */
1191         while ((d40d = d40_first_done(d40c))) {
1192                 d40_desc_remove(d40d);
1193                 d40_desc_free(d40c, d40d);
1194         }
1195
1196         /* Release active descriptors */
1197         while ((d40d = d40_first_active_get(d40c))) {
1198                 d40_desc_remove(d40d);
1199                 d40_desc_free(d40c, d40d);
1200         }
1201
1202         /* Release queued descriptors waiting for transfer */
1203         while ((d40d = d40_first_queued(d40c))) {
1204                 d40_desc_remove(d40d);
1205                 d40_desc_free(d40c, d40d);
1206         }
1207
1208         /* Release pending descriptors */
1209         while ((d40d = d40_first_pending(d40c))) {
1210                 d40_desc_remove(d40d);
1211                 d40_desc_free(d40c, d40d);
1212         }
1213
1214         /* Release client owned descriptors */
1215         if (!list_empty(&d40c->client))
1216                 list_for_each_entry_safe(d40d, _d, &d40c->client, node) {
1217                         d40_desc_remove(d40d);
1218                         d40_desc_free(d40c, d40d);
1219                 }
1220
1221         /* Release descriptors in prepare queue */
1222         if (!list_empty(&d40c->prepare_queue))
1223                 list_for_each_entry_safe(d40d, _d,
1224                                          &d40c->prepare_queue, node) {
1225                         d40_desc_remove(d40d);
1226                         d40_desc_free(d40c, d40d);
1227                 }
1228
1229         d40c->pending_tx = 0;
1230 }
1231
1232 static void __d40_config_set_event(struct d40_chan *d40c,
1233                                    enum d40_events event_type, u32 event,
1234                                    int reg)
1235 {
1236         void __iomem *addr = chan_base(d40c) + reg;
1237         int tries;
1238         u32 status;
1239
1240         switch (event_type) {
1241
1242         case D40_DEACTIVATE_EVENTLINE:
1243
1244                 writel((D40_DEACTIVATE_EVENTLINE << D40_EVENTLINE_POS(event))
1245                        | ~D40_EVENTLINE_MASK(event), addr);
1246                 break;
1247
1248         case D40_SUSPEND_REQ_EVENTLINE:
1249                 status = (readl(addr) & D40_EVENTLINE_MASK(event)) >>
1250                           D40_EVENTLINE_POS(event);
1251
1252                 if (status == D40_DEACTIVATE_EVENTLINE ||
1253                     status == D40_SUSPEND_REQ_EVENTLINE)
1254                         break;
1255
1256                 writel((D40_SUSPEND_REQ_EVENTLINE << D40_EVENTLINE_POS(event))
1257                        | ~D40_EVENTLINE_MASK(event), addr);
1258
1259                 for (tries = 0 ; tries < D40_SUSPEND_MAX_IT; tries++) {
1260
1261                         status = (readl(addr) & D40_EVENTLINE_MASK(event)) >>
1262                                   D40_EVENTLINE_POS(event);
1263
1264                         cpu_relax();
1265                         /*
1266                          * Reduce the number of bus accesses while
1267                          * waiting for the DMA to suspend.
1268                          */
1269                         udelay(3);
1270
1271                         if (status == D40_DEACTIVATE_EVENTLINE)
1272                                 break;
1273                 }
1274
1275                 if (tries == D40_SUSPEND_MAX_IT) {
1276                         chan_err(d40c,
1277                                 "unable to stop the event_line chl %d (log: %d)"
1278                                 "status %x\n", d40c->phy_chan->num,
1279                                  d40c->log_num, status);
1280                 }
1281                 break;
1282
1283         case D40_ACTIVATE_EVENTLINE:
1284         /*
1285          * The hardware sometimes doesn't register the enable when src and dst
1286          * event lines are active on the same logical channel.  Retry to ensure
1287          * it does.  Usually only one retry is sufficient.
1288          */
1289                 tries = 100;
1290                 while (--tries) {
1291                         writel((D40_ACTIVATE_EVENTLINE <<
1292                                 D40_EVENTLINE_POS(event)) |
1293                                 ~D40_EVENTLINE_MASK(event), addr);
1294
1295                         if (readl(addr) & D40_EVENTLINE_MASK(event))
1296                                 break;
1297                 }
1298
1299                 if (tries != 99)
1300                         dev_dbg(chan2dev(d40c),
1301                                 "[%s] workaround enable S%cLNK (%d tries)\n",
1302                                 __func__, reg == D40_CHAN_REG_SSLNK ? 'S' : 'D',
1303                                 100 - tries);
1304
1305                 WARN_ON(!tries);
1306                 break;
1307
1308         case D40_ROUND_EVENTLINE:
1309                 BUG();
1310                 break;
1311
1312         }
1313 }
1314
1315 static void d40_config_set_event(struct d40_chan *d40c,
1316                                  enum d40_events event_type)
1317 {
1318         u32 event = D40_TYPE_TO_EVENT(d40c->dma_cfg.dev_type);
1319
1320         /* Enable event line connected to device (or memcpy) */
1321         if ((d40c->dma_cfg.dir == DMA_DEV_TO_MEM) ||
1322             (d40c->dma_cfg.dir == DMA_DEV_TO_DEV))
1323                 __d40_config_set_event(d40c, event_type, event,
1324                                        D40_CHAN_REG_SSLNK);
1325
1326         if (d40c->dma_cfg.dir !=  DMA_DEV_TO_MEM)
1327                 __d40_config_set_event(d40c, event_type, event,
1328                                        D40_CHAN_REG_SDLNK);
1329 }
1330
1331 static u32 d40_chan_has_events(struct d40_chan *d40c)
1332 {
1333         void __iomem *chanbase = chan_base(d40c);
1334         u32 val;
1335
1336         val = readl(chanbase + D40_CHAN_REG_SSLNK);
1337         val |= readl(chanbase + D40_CHAN_REG_SDLNK);
1338
1339         return val;
1340 }
1341
1342 static int
1343 __d40_execute_command_log(struct d40_chan *d40c, enum d40_command command)
1344 {
1345         unsigned long flags;
1346         int ret = 0;
1347         u32 active_status;
1348         void __iomem *active_reg;
1349
1350         if (d40c->phy_chan->num % 2 == 0)
1351                 active_reg = d40c->base->virtbase + D40_DREG_ACTIVE;
1352         else
1353                 active_reg = d40c->base->virtbase + D40_DREG_ACTIVO;
1354
1355
1356         spin_lock_irqsave(&d40c->phy_chan->lock, flags);
1357
1358         switch (command) {
1359         case D40_DMA_STOP:
1360         case D40_DMA_SUSPEND_REQ:
1361
1362                 active_status = (readl(active_reg) &
1363                                  D40_CHAN_POS_MASK(d40c->phy_chan->num)) >>
1364                                  D40_CHAN_POS(d40c->phy_chan->num);
1365
1366                 if (active_status == D40_DMA_RUN)
1367                         d40_config_set_event(d40c, D40_SUSPEND_REQ_EVENTLINE);
1368                 else
1369                         d40_config_set_event(d40c, D40_DEACTIVATE_EVENTLINE);
1370
1371                 if (!d40_chan_has_events(d40c) && (command == D40_DMA_STOP))
1372                         ret = __d40_execute_command_phy(d40c, command);
1373
1374                 break;
1375
1376         case D40_DMA_RUN:
1377
1378                 d40_config_set_event(d40c, D40_ACTIVATE_EVENTLINE);
1379                 ret = __d40_execute_command_phy(d40c, command);
1380                 break;
1381
1382         case D40_DMA_SUSPENDED:
1383                 BUG();
1384                 break;
1385         }
1386
1387         spin_unlock_irqrestore(&d40c->phy_chan->lock, flags);
1388         return ret;
1389 }
1390
1391 static int d40_channel_execute_command(struct d40_chan *d40c,
1392                                        enum d40_command command)
1393 {
1394         if (chan_is_logical(d40c))
1395                 return __d40_execute_command_log(d40c, command);
1396         else
1397                 return __d40_execute_command_phy(d40c, command);
1398 }
1399
1400 static u32 d40_get_prmo(struct d40_chan *d40c)
1401 {
1402         static const unsigned int phy_map[] = {
1403                 [STEDMA40_PCHAN_BASIC_MODE]
1404                         = D40_DREG_PRMO_PCHAN_BASIC,
1405                 [STEDMA40_PCHAN_MODULO_MODE]
1406                         = D40_DREG_PRMO_PCHAN_MODULO,
1407                 [STEDMA40_PCHAN_DOUBLE_DST_MODE]
1408                         = D40_DREG_PRMO_PCHAN_DOUBLE_DST,
1409         };
1410         static const unsigned int log_map[] = {
1411                 [STEDMA40_LCHAN_SRC_PHY_DST_LOG]
1412                         = D40_DREG_PRMO_LCHAN_SRC_PHY_DST_LOG,
1413                 [STEDMA40_LCHAN_SRC_LOG_DST_PHY]
1414                         = D40_DREG_PRMO_LCHAN_SRC_LOG_DST_PHY,
1415                 [STEDMA40_LCHAN_SRC_LOG_DST_LOG]
1416                         = D40_DREG_PRMO_LCHAN_SRC_LOG_DST_LOG,
1417         };
1418
1419         if (chan_is_physical(d40c))
1420                 return phy_map[d40c->dma_cfg.mode_opt];
1421         else
1422                 return log_map[d40c->dma_cfg.mode_opt];
1423 }
1424
1425 static void d40_config_write(struct d40_chan *d40c)
1426 {
1427         u32 addr_base;
1428         u32 var;
1429
1430         /* Odd addresses are even addresses + 4 */
1431         addr_base = (d40c->phy_chan->num % 2) * 4;
1432         /* Setup channel mode to logical or physical */
1433         var = ((u32)(chan_is_logical(d40c)) + 1) <<
1434                 D40_CHAN_POS(d40c->phy_chan->num);
1435         writel(var, d40c->base->virtbase + D40_DREG_PRMSE + addr_base);
1436
1437         /* Setup operational mode option register */
1438         var = d40_get_prmo(d40c) << D40_CHAN_POS(d40c->phy_chan->num);
1439
1440         writel(var, d40c->base->virtbase + D40_DREG_PRMOE + addr_base);
1441
1442         if (chan_is_logical(d40c)) {
1443                 int lidx = (d40c->phy_chan->num << D40_SREG_ELEM_LOG_LIDX_POS)
1444                            & D40_SREG_ELEM_LOG_LIDX_MASK;
1445                 void __iomem *chanbase = chan_base(d40c);
1446
1447                 /* Set default config for CFG reg */
1448                 writel(d40c->src_def_cfg, chanbase + D40_CHAN_REG_SSCFG);
1449                 writel(d40c->dst_def_cfg, chanbase + D40_CHAN_REG_SDCFG);
1450
1451                 /* Set LIDX for lcla */
1452                 writel(lidx, chanbase + D40_CHAN_REG_SSELT);
1453                 writel(lidx, chanbase + D40_CHAN_REG_SDELT);
1454
1455                 /* Clear LNK which will be used by d40_chan_has_events() */
1456                 writel(0, chanbase + D40_CHAN_REG_SSLNK);
1457                 writel(0, chanbase + D40_CHAN_REG_SDLNK);
1458         }
1459 }
1460
1461 static u32 d40_residue(struct d40_chan *d40c)
1462 {
1463         u32 num_elt;
1464
1465         if (chan_is_logical(d40c))
1466                 num_elt = (readl(&d40c->lcpa->lcsp2) & D40_MEM_LCSP2_ECNT_MASK)
1467                         >> D40_MEM_LCSP2_ECNT_POS;
1468         else {
1469                 u32 val = readl(chan_base(d40c) + D40_CHAN_REG_SDELT);
1470                 num_elt = (val & D40_SREG_ELEM_PHY_ECNT_MASK)
1471                           >> D40_SREG_ELEM_PHY_ECNT_POS;
1472         }
1473
1474         return num_elt * d40c->dma_cfg.dst_info.data_width;
1475 }
1476
1477 static bool d40_tx_is_linked(struct d40_chan *d40c)
1478 {
1479         bool is_link;
1480
1481         if (chan_is_logical(d40c))
1482                 is_link = readl(&d40c->lcpa->lcsp3) &  D40_MEM_LCSP3_DLOS_MASK;
1483         else
1484                 is_link = readl(chan_base(d40c) + D40_CHAN_REG_SDLNK)
1485                           & D40_SREG_LNK_PHYS_LNK_MASK;
1486
1487         return is_link;
1488 }
1489
1490 static int d40_pause(struct d40_chan *d40c)
1491 {
1492         int res = 0;
1493         unsigned long flags;
1494
1495         if (!d40c->busy)
1496                 return 0;
1497
1498         pm_runtime_get_sync(d40c->base->dev);
1499         spin_lock_irqsave(&d40c->lock, flags);
1500
1501         res = d40_channel_execute_command(d40c, D40_DMA_SUSPEND_REQ);
1502
1503         pm_runtime_mark_last_busy(d40c->base->dev);
1504         pm_runtime_put_autosuspend(d40c->base->dev);
1505         spin_unlock_irqrestore(&d40c->lock, flags);
1506         return res;
1507 }
1508
1509 static int d40_resume(struct d40_chan *d40c)
1510 {
1511         int res = 0;
1512         unsigned long flags;
1513
1514         if (!d40c->busy)
1515                 return 0;
1516
1517         spin_lock_irqsave(&d40c->lock, flags);
1518         pm_runtime_get_sync(d40c->base->dev);
1519
1520         /* If bytes left to transfer or linked tx resume job */
1521         if (d40_residue(d40c) || d40_tx_is_linked(d40c))
1522                 res = d40_channel_execute_command(d40c, D40_DMA_RUN);
1523
1524         pm_runtime_mark_last_busy(d40c->base->dev);
1525         pm_runtime_put_autosuspend(d40c->base->dev);
1526         spin_unlock_irqrestore(&d40c->lock, flags);
1527         return res;
1528 }
1529
1530 static dma_cookie_t d40_tx_submit(struct dma_async_tx_descriptor *tx)
1531 {
1532         struct d40_chan *d40c = container_of(tx->chan,
1533                                              struct d40_chan,
1534                                              chan);
1535         struct d40_desc *d40d = container_of(tx, struct d40_desc, txd);
1536         unsigned long flags;
1537         dma_cookie_t cookie;
1538
1539         spin_lock_irqsave(&d40c->lock, flags);
1540         cookie = dma_cookie_assign(tx);
1541         d40_desc_queue(d40c, d40d);
1542         spin_unlock_irqrestore(&d40c->lock, flags);
1543
1544         return cookie;
1545 }
1546
1547 static int d40_start(struct d40_chan *d40c)
1548 {
1549         return d40_channel_execute_command(d40c, D40_DMA_RUN);
1550 }
1551
1552 static struct d40_desc *d40_queue_start(struct d40_chan *d40c)
1553 {
1554         struct d40_desc *d40d;
1555         int err;
1556
1557         /* Start queued jobs, if any */
1558         d40d = d40_first_queued(d40c);
1559
1560         if (d40d != NULL) {
1561                 if (!d40c->busy) {
1562                         d40c->busy = true;
1563                         pm_runtime_get_sync(d40c->base->dev);
1564                 }
1565
1566                 /* Remove from queue */
1567                 d40_desc_remove(d40d);
1568
1569                 /* Add to active queue */
1570                 d40_desc_submit(d40c, d40d);
1571
1572                 /* Initiate DMA job */
1573                 d40_desc_load(d40c, d40d);
1574
1575                 /* Start dma job */
1576                 err = d40_start(d40c);
1577
1578                 if (err)
1579                         return NULL;
1580         }
1581
1582         return d40d;
1583 }
1584
1585 /* called from interrupt context */
1586 static void dma_tc_handle(struct d40_chan *d40c)
1587 {
1588         struct d40_desc *d40d;
1589
1590         /* Get first active entry from list */
1591         d40d = d40_first_active_get(d40c);
1592
1593         if (d40d == NULL)
1594                 return;
1595
1596         if (d40d->cyclic) {
1597                 /*
1598                  * If this was a paritially loaded list, we need to reloaded
1599                  * it, and only when the list is completed.  We need to check
1600                  * for done because the interrupt will hit for every link, and
1601                  * not just the last one.
1602                  */
1603                 if (d40d->lli_current < d40d->lli_len
1604                     && !d40_tx_is_linked(d40c)
1605                     && !d40_residue(d40c)) {
1606                         d40_lcla_free_all(d40c, d40d);
1607                         d40_desc_load(d40c, d40d);
1608                         (void) d40_start(d40c);
1609
1610                         if (d40d->lli_current == d40d->lli_len)
1611                                 d40d->lli_current = 0;
1612                 }
1613         } else {
1614                 d40_lcla_free_all(d40c, d40d);
1615
1616                 if (d40d->lli_current < d40d->lli_len) {
1617                         d40_desc_load(d40c, d40d);
1618                         /* Start dma job */
1619                         (void) d40_start(d40c);
1620                         return;
1621                 }
1622
1623                 if (d40_queue_start(d40c) == NULL) {
1624                         d40c->busy = false;
1625
1626                         pm_runtime_mark_last_busy(d40c->base->dev);
1627                         pm_runtime_put_autosuspend(d40c->base->dev);
1628                 }
1629
1630                 d40_desc_remove(d40d);
1631                 d40_desc_done(d40c, d40d);
1632         }
1633
1634         d40c->pending_tx++;
1635         tasklet_schedule(&d40c->tasklet);
1636
1637 }
1638
1639 static void dma_tasklet(unsigned long data)
1640 {
1641         struct d40_chan *d40c = (struct d40_chan *) data;
1642         struct d40_desc *d40d;
1643         unsigned long flags;
1644         dma_async_tx_callback callback;
1645         void *callback_param;
1646
1647         spin_lock_irqsave(&d40c->lock, flags);
1648
1649         /* Get first entry from the done list */
1650         d40d = d40_first_done(d40c);
1651         if (d40d == NULL) {
1652                 /* Check if we have reached here for cyclic job */
1653                 d40d = d40_first_active_get(d40c);
1654                 if (d40d == NULL || !d40d->cyclic)
1655                         goto err;
1656         }
1657
1658         if (!d40d->cyclic)
1659                 dma_cookie_complete(&d40d->txd);
1660
1661         /*
1662          * If terminating a channel pending_tx is set to zero.
1663          * This prevents any finished active jobs to return to the client.
1664          */
1665         if (d40c->pending_tx == 0) {
1666                 spin_unlock_irqrestore(&d40c->lock, flags);
1667                 return;
1668         }
1669
1670         /* Callback to client */
1671         callback = d40d->txd.callback;
1672         callback_param = d40d->txd.callback_param;
1673
1674         if (!d40d->cyclic) {
1675                 if (async_tx_test_ack(&d40d->txd)) {
1676                         d40_desc_remove(d40d);
1677                         d40_desc_free(d40c, d40d);
1678                 } else if (!d40d->is_in_client_list) {
1679                         d40_desc_remove(d40d);
1680                         d40_lcla_free_all(d40c, d40d);
1681                         list_add_tail(&d40d->node, &d40c->client);
1682                         d40d->is_in_client_list = true;
1683                 }
1684         }
1685
1686         d40c->pending_tx--;
1687
1688         if (d40c->pending_tx)
1689                 tasklet_schedule(&d40c->tasklet);
1690
1691         spin_unlock_irqrestore(&d40c->lock, flags);
1692
1693         if (callback && (d40d->txd.flags & DMA_PREP_INTERRUPT))
1694                 callback(callback_param);
1695
1696         return;
1697
1698 err:
1699         /* Rescue manouver if receiving double interrupts */
1700         if (d40c->pending_tx > 0)
1701                 d40c->pending_tx--;
1702         spin_unlock_irqrestore(&d40c->lock, flags);
1703 }
1704
1705 static irqreturn_t d40_handle_interrupt(int irq, void *data)
1706 {
1707         int i;
1708         u32 idx;
1709         u32 row;
1710         long chan = -1;
1711         struct d40_chan *d40c;
1712         unsigned long flags;
1713         struct d40_base *base = data;
1714         u32 regs[base->gen_dmac.il_size];
1715         struct d40_interrupt_lookup *il = base->gen_dmac.il;
1716         u32 il_size = base->gen_dmac.il_size;
1717
1718         spin_lock_irqsave(&base->interrupt_lock, flags);
1719
1720         /* Read interrupt status of both logical and physical channels */
1721         for (i = 0; i < il_size; i++)
1722                 regs[i] = readl(base->virtbase + il[i].src);
1723
1724         for (;;) {
1725
1726                 chan = find_next_bit((unsigned long *)regs,
1727                                      BITS_PER_LONG * il_size, chan + 1);
1728
1729                 /* No more set bits found? */
1730                 if (chan == BITS_PER_LONG * il_size)
1731                         break;
1732
1733                 row = chan / BITS_PER_LONG;
1734                 idx = chan & (BITS_PER_LONG - 1);
1735
1736                 if (il[row].offset == D40_PHY_CHAN)
1737                         d40c = base->lookup_phy_chans[idx];
1738                 else
1739                         d40c = base->lookup_log_chans[il[row].offset + idx];
1740
1741                 if (!d40c) {
1742                         /*
1743                          * No error because this can happen if something else
1744                          * in the system is using the channel.
1745                          */
1746                         continue;
1747                 }
1748
1749                 /* ACK interrupt */
1750                 writel(BIT(idx), base->virtbase + il[row].clr);
1751
1752                 spin_lock(&d40c->lock);
1753
1754                 if (!il[row].is_error)
1755                         dma_tc_handle(d40c);
1756                 else
1757                         d40_err(base->dev, "IRQ chan: %ld offset %d idx %d\n",
1758                                 chan, il[row].offset, idx);
1759
1760                 spin_unlock(&d40c->lock);
1761         }
1762
1763         spin_unlock_irqrestore(&base->interrupt_lock, flags);
1764
1765         return IRQ_HANDLED;
1766 }
1767
1768 static int d40_validate_conf(struct d40_chan *d40c,
1769                              struct stedma40_chan_cfg *conf)
1770 {
1771         int res = 0;
1772         bool is_log = conf->mode == STEDMA40_MODE_LOGICAL;
1773
1774         if (!conf->dir) {
1775                 chan_err(d40c, "Invalid direction.\n");
1776                 res = -EINVAL;
1777         }
1778
1779         if ((is_log && conf->dev_type > d40c->base->num_log_chans)  ||
1780             (!is_log && conf->dev_type > d40c->base->num_phy_chans) ||
1781             (conf->dev_type < 0)) {
1782                 chan_err(d40c, "Invalid device type (%d)\n", conf->dev_type);
1783                 res = -EINVAL;
1784         }
1785
1786         if (conf->dir == DMA_DEV_TO_DEV) {
1787                 /*
1788                  * DMAC HW supports it. Will be added to this driver,
1789                  * in case any dma client requires it.
1790                  */
1791                 chan_err(d40c, "periph to periph not supported\n");
1792                 res = -EINVAL;
1793         }
1794
1795         if (d40_psize_2_burst_size(is_log, conf->src_info.psize) *
1796             conf->src_info.data_width !=
1797             d40_psize_2_burst_size(is_log, conf->dst_info.psize) *
1798             conf->dst_info.data_width) {
1799                 /*
1800                  * The DMAC hardware only supports
1801                  * src (burst x width) == dst (burst x width)
1802                  */
1803
1804                 chan_err(d40c, "src (burst x width) != dst (burst x width)\n");
1805                 res = -EINVAL;
1806         }
1807
1808         return res;
1809 }
1810
1811 static bool d40_alloc_mask_set(struct d40_phy_res *phy,
1812                                bool is_src, int log_event_line, bool is_log,
1813                                bool *first_user)
1814 {
1815         unsigned long flags;
1816         spin_lock_irqsave(&phy->lock, flags);
1817
1818         *first_user = ((phy->allocated_src | phy->allocated_dst)
1819                         == D40_ALLOC_FREE);
1820
1821         if (!is_log) {
1822                 /* Physical interrupts are masked per physical full channel */
1823                 if (phy->allocated_src == D40_ALLOC_FREE &&
1824                     phy->allocated_dst == D40_ALLOC_FREE) {
1825                         phy->allocated_dst = D40_ALLOC_PHY;
1826                         phy->allocated_src = D40_ALLOC_PHY;
1827                         goto found;
1828                 } else
1829                         goto not_found;
1830         }
1831
1832         /* Logical channel */
1833         if (is_src) {
1834                 if (phy->allocated_src == D40_ALLOC_PHY)
1835                         goto not_found;
1836
1837                 if (phy->allocated_src == D40_ALLOC_FREE)
1838                         phy->allocated_src = D40_ALLOC_LOG_FREE;
1839
1840                 if (!(phy->allocated_src & BIT(log_event_line))) {
1841                         phy->allocated_src |= BIT(log_event_line);
1842                         goto found;
1843                 } else
1844                         goto not_found;
1845         } else {
1846                 if (phy->allocated_dst == D40_ALLOC_PHY)
1847                         goto not_found;
1848
1849                 if (phy->allocated_dst == D40_ALLOC_FREE)
1850                         phy->allocated_dst = D40_ALLOC_LOG_FREE;
1851
1852                 if (!(phy->allocated_dst & BIT(log_event_line))) {
1853                         phy->allocated_dst |= BIT(log_event_line);
1854                         goto found;
1855                 } else
1856                         goto not_found;
1857         }
1858
1859 not_found:
1860         spin_unlock_irqrestore(&phy->lock, flags);
1861         return false;
1862 found:
1863         spin_unlock_irqrestore(&phy->lock, flags);
1864         return true;
1865 }
1866
1867 static bool d40_alloc_mask_free(struct d40_phy_res *phy, bool is_src,
1868                                int log_event_line)
1869 {
1870         unsigned long flags;
1871         bool is_free = false;
1872
1873         spin_lock_irqsave(&phy->lock, flags);
1874         if (!log_event_line) {
1875                 phy->allocated_dst = D40_ALLOC_FREE;
1876                 phy->allocated_src = D40_ALLOC_FREE;
1877                 is_free = true;
1878                 goto out;
1879         }
1880
1881         /* Logical channel */
1882         if (is_src) {
1883                 phy->allocated_src &= ~BIT(log_event_line);
1884                 if (phy->allocated_src == D40_ALLOC_LOG_FREE)
1885                         phy->allocated_src = D40_ALLOC_FREE;
1886         } else {
1887                 phy->allocated_dst &= ~BIT(log_event_line);
1888                 if (phy->allocated_dst == D40_ALLOC_LOG_FREE)
1889                         phy->allocated_dst = D40_ALLOC_FREE;
1890         }
1891
1892         is_free = ((phy->allocated_src | phy->allocated_dst) ==
1893                    D40_ALLOC_FREE);
1894
1895 out:
1896         spin_unlock_irqrestore(&phy->lock, flags);
1897
1898         return is_free;
1899 }
1900
1901 static int d40_allocate_channel(struct d40_chan *d40c, bool *first_phy_user)
1902 {
1903         int dev_type = d40c->dma_cfg.dev_type;
1904         int event_group;
1905         int event_line;
1906         struct d40_phy_res *phys;
1907         int i;
1908         int j;
1909         int log_num;
1910         int num_phy_chans;
1911         bool is_src;
1912         bool is_log = d40c->dma_cfg.mode == STEDMA40_MODE_LOGICAL;
1913
1914         phys = d40c->base->phy_res;
1915         num_phy_chans = d40c->base->num_phy_chans;
1916
1917         if (d40c->dma_cfg.dir == DMA_DEV_TO_MEM) {
1918                 log_num = 2 * dev_type;
1919                 is_src = true;
1920         } else if (d40c->dma_cfg.dir == DMA_MEM_TO_DEV ||
1921                    d40c->dma_cfg.dir == DMA_MEM_TO_MEM) {
1922                 /* dst event lines are used for logical memcpy */
1923                 log_num = 2 * dev_type + 1;
1924                 is_src = false;
1925         } else
1926                 return -EINVAL;
1927
1928         event_group = D40_TYPE_TO_GROUP(dev_type);
1929         event_line = D40_TYPE_TO_EVENT(dev_type);
1930
1931         if (!is_log) {
1932                 if (d40c->dma_cfg.dir == DMA_MEM_TO_MEM) {
1933                         /* Find physical half channel */
1934                         if (d40c->dma_cfg.use_fixed_channel) {
1935                                 i = d40c->dma_cfg.phy_channel;
1936                                 if (d40_alloc_mask_set(&phys[i], is_src,
1937                                                        0, is_log,
1938                                                        first_phy_user))
1939                                         goto found_phy;
1940                         } else {
1941                                 for (i = 0; i < num_phy_chans; i++) {
1942                                         if (d40_alloc_mask_set(&phys[i], is_src,
1943                                                        0, is_log,
1944                                                        first_phy_user))
1945                                                 goto found_phy;
1946                                 }
1947                         }
1948                 } else
1949                         for (j = 0; j < d40c->base->num_phy_chans; j += 8) {
1950                                 int phy_num = j  + event_group * 2;
1951                                 for (i = phy_num; i < phy_num + 2; i++) {
1952                                         if (d40_alloc_mask_set(&phys[i],
1953                                                                is_src,
1954                                                                0,
1955                                                                is_log,
1956                                                                first_phy_user))
1957                                                 goto found_phy;
1958                                 }
1959                         }
1960                 return -EINVAL;
1961 found_phy:
1962                 d40c->phy_chan = &phys[i];
1963                 d40c->log_num = D40_PHY_CHAN;
1964                 goto out;
1965         }
1966         if (dev_type == -1)
1967                 return -EINVAL;
1968
1969         /* Find logical channel */
1970         for (j = 0; j < d40c->base->num_phy_chans; j += 8) {
1971                 int phy_num = j + event_group * 2;
1972
1973                 if (d40c->dma_cfg.use_fixed_channel) {
1974                         i = d40c->dma_cfg.phy_channel;
1975
1976                         if ((i != phy_num) && (i != phy_num + 1)) {
1977                                 dev_err(chan2dev(d40c),
1978                                         "invalid fixed phy channel %d\n", i);
1979                                 return -EINVAL;
1980                         }
1981
1982                         if (d40_alloc_mask_set(&phys[i], is_src, event_line,
1983                                                is_log, first_phy_user))
1984                                 goto found_log;
1985
1986                         dev_err(chan2dev(d40c),
1987                                 "could not allocate fixed phy channel %d\n", i);
1988                         return -EINVAL;
1989                 }
1990
1991                 /*
1992                  * Spread logical channels across all available physical rather
1993                  * than pack every logical channel at the first available phy
1994                  * channels.
1995                  */
1996                 if (is_src) {
1997                         for (i = phy_num; i < phy_num + 2; i++) {
1998                                 if (d40_alloc_mask_set(&phys[i], is_src,
1999                                                        event_line, is_log,
2000                                                        first_phy_user))
2001                                         goto found_log;
2002                         }
2003                 } else {
2004                         for (i = phy_num + 1; i >= phy_num; i--) {
2005                                 if (d40_alloc_mask_set(&phys[i], is_src,
2006                                                        event_line, is_log,
2007                                                        first_phy_user))
2008                                         goto found_log;
2009                         }
2010                 }
2011         }
2012         return -EINVAL;
2013
2014 found_log:
2015         d40c->phy_chan = &phys[i];
2016         d40c->log_num = log_num;
2017 out:
2018
2019         if (is_log)
2020                 d40c->base->lookup_log_chans[d40c->log_num] = d40c;
2021         else
2022                 d40c->base->lookup_phy_chans[d40c->phy_chan->num] = d40c;
2023
2024         return 0;
2025
2026 }
2027
2028 static int d40_config_memcpy(struct d40_chan *d40c)
2029 {
2030         dma_cap_mask_t cap = d40c->chan.device->cap_mask;
2031
2032         if (dma_has_cap(DMA_MEMCPY, cap) && !dma_has_cap(DMA_SLAVE, cap)) {
2033                 d40c->dma_cfg = dma40_memcpy_conf_log;
2034                 d40c->dma_cfg.dev_type = dma40_memcpy_channels[d40c->chan.chan_id];
2035
2036                 d40_log_cfg(&d40c->dma_cfg,
2037                             &d40c->log_def.lcsp1, &d40c->log_def.lcsp3);
2038
2039         } else if (dma_has_cap(DMA_MEMCPY, cap) &&
2040                    dma_has_cap(DMA_SLAVE, cap)) {
2041                 d40c->dma_cfg = dma40_memcpy_conf_phy;
2042
2043                 /* Generate interrrupt at end of transfer or relink. */
2044                 d40c->dst_def_cfg |= BIT(D40_SREG_CFG_TIM_POS);
2045
2046                 /* Generate interrupt on error. */
2047                 d40c->src_def_cfg |= BIT(D40_SREG_CFG_EIM_POS);
2048                 d40c->dst_def_cfg |= BIT(D40_SREG_CFG_EIM_POS);
2049
2050         } else {
2051                 chan_err(d40c, "No memcpy\n");
2052                 return -EINVAL;
2053         }
2054
2055         return 0;
2056 }
2057
2058 static int d40_free_dma(struct d40_chan *d40c)
2059 {
2060
2061         int res = 0;
2062         u32 event = D40_TYPE_TO_EVENT(d40c->dma_cfg.dev_type);
2063         struct d40_phy_res *phy = d40c->phy_chan;
2064         bool is_src;
2065
2066         /* Terminate all queued and active transfers */
2067         d40_term_all(d40c);
2068
2069         if (phy == NULL) {
2070                 chan_err(d40c, "phy == null\n");
2071                 return -EINVAL;
2072         }
2073
2074         if (phy->allocated_src == D40_ALLOC_FREE &&
2075             phy->allocated_dst == D40_ALLOC_FREE) {
2076                 chan_err(d40c, "channel already free\n");
2077                 return -EINVAL;
2078         }
2079
2080         if (d40c->dma_cfg.dir == DMA_MEM_TO_DEV ||
2081             d40c->dma_cfg.dir == DMA_MEM_TO_MEM)
2082                 is_src = false;
2083         else if (d40c->dma_cfg.dir == DMA_DEV_TO_MEM)
2084                 is_src = true;
2085         else {
2086                 chan_err(d40c, "Unknown direction\n");
2087                 return -EINVAL;
2088         }
2089
2090         pm_runtime_get_sync(d40c->base->dev);
2091         res = d40_channel_execute_command(d40c, D40_DMA_STOP);
2092         if (res) {
2093                 chan_err(d40c, "stop failed\n");
2094                 goto out;
2095         }
2096
2097         d40_alloc_mask_free(phy, is_src, chan_is_logical(d40c) ? event : 0);
2098
2099         if (chan_is_logical(d40c))
2100                 d40c->base->lookup_log_chans[d40c->log_num] = NULL;
2101         else
2102                 d40c->base->lookup_phy_chans[phy->num] = NULL;
2103
2104         if (d40c->busy) {
2105                 pm_runtime_mark_last_busy(d40c->base->dev);
2106                 pm_runtime_put_autosuspend(d40c->base->dev);
2107         }
2108
2109         d40c->busy = false;
2110         d40c->phy_chan = NULL;
2111         d40c->configured = false;
2112 out:
2113
2114         pm_runtime_mark_last_busy(d40c->base->dev);
2115         pm_runtime_put_autosuspend(d40c->base->dev);
2116         return res;
2117 }
2118
2119 static bool d40_is_paused(struct d40_chan *d40c)
2120 {
2121         void __iomem *chanbase = chan_base(d40c);
2122         bool is_paused = false;
2123         unsigned long flags;
2124         void __iomem *active_reg;
2125         u32 status;
2126         u32 event = D40_TYPE_TO_EVENT(d40c->dma_cfg.dev_type);
2127
2128         spin_lock_irqsave(&d40c->lock, flags);
2129
2130         if (chan_is_physical(d40c)) {
2131                 if (d40c->phy_chan->num % 2 == 0)
2132                         active_reg = d40c->base->virtbase + D40_DREG_ACTIVE;
2133                 else
2134                         active_reg = d40c->base->virtbase + D40_DREG_ACTIVO;
2135
2136                 status = (readl(active_reg) &
2137                           D40_CHAN_POS_MASK(d40c->phy_chan->num)) >>
2138                         D40_CHAN_POS(d40c->phy_chan->num);
2139                 if (status == D40_DMA_SUSPENDED || status == D40_DMA_STOP)
2140                         is_paused = true;
2141
2142                 goto _exit;
2143         }
2144
2145         if (d40c->dma_cfg.dir == DMA_MEM_TO_DEV ||
2146             d40c->dma_cfg.dir == DMA_MEM_TO_MEM) {
2147                 status = readl(chanbase + D40_CHAN_REG_SDLNK);
2148         } else if (d40c->dma_cfg.dir == DMA_DEV_TO_MEM) {
2149                 status = readl(chanbase + D40_CHAN_REG_SSLNK);
2150         } else {
2151                 chan_err(d40c, "Unknown direction\n");
2152                 goto _exit;
2153         }
2154
2155         status = (status & D40_EVENTLINE_MASK(event)) >>
2156                 D40_EVENTLINE_POS(event);
2157
2158         if (status != D40_DMA_RUN)
2159                 is_paused = true;
2160 _exit:
2161         spin_unlock_irqrestore(&d40c->lock, flags);
2162         return is_paused;
2163
2164 }
2165
2166 static u32 stedma40_residue(struct dma_chan *chan)
2167 {
2168         struct d40_chan *d40c =
2169                 container_of(chan, struct d40_chan, chan);
2170         u32 bytes_left;
2171         unsigned long flags;
2172
2173         spin_lock_irqsave(&d40c->lock, flags);
2174         bytes_left = d40_residue(d40c);
2175         spin_unlock_irqrestore(&d40c->lock, flags);
2176
2177         return bytes_left;
2178 }
2179
2180 static int
2181 d40_prep_sg_log(struct d40_chan *chan, struct d40_desc *desc,
2182                 struct scatterlist *sg_src, struct scatterlist *sg_dst,
2183                 unsigned int sg_len, dma_addr_t src_dev_addr,
2184                 dma_addr_t dst_dev_addr)
2185 {
2186         struct stedma40_chan_cfg *cfg = &chan->dma_cfg;
2187         struct stedma40_half_channel_info *src_info = &cfg->src_info;
2188         struct stedma40_half_channel_info *dst_info = &cfg->dst_info;
2189         int ret;
2190
2191         ret = d40_log_sg_to_lli(sg_src, sg_len,
2192                                 src_dev_addr,
2193                                 desc->lli_log.src,
2194                                 chan->log_def.lcsp1,
2195                                 src_info->data_width,
2196                                 dst_info->data_width);
2197
2198         ret = d40_log_sg_to_lli(sg_dst, sg_len,
2199                                 dst_dev_addr,
2200                                 desc->lli_log.dst,
2201                                 chan->log_def.lcsp3,
2202                                 dst_info->data_width,
2203                                 src_info->data_width);
2204
2205         return ret < 0 ? ret : 0;
2206 }
2207
2208 static int
2209 d40_prep_sg_phy(struct d40_chan *chan, struct d40_desc *desc,
2210                 struct scatterlist *sg_src, struct scatterlist *sg_dst,
2211                 unsigned int sg_len, dma_addr_t src_dev_addr,
2212                 dma_addr_t dst_dev_addr)
2213 {
2214         struct stedma40_chan_cfg *cfg = &chan->dma_cfg;
2215         struct stedma40_half_channel_info *src_info = &cfg->src_info;
2216         struct stedma40_half_channel_info *dst_info = &cfg->dst_info;
2217         unsigned long flags = 0;
2218         int ret;
2219
2220         if (desc->cyclic)
2221                 flags |= LLI_CYCLIC | LLI_TERM_INT;
2222
2223         ret = d40_phy_sg_to_lli(sg_src, sg_len, src_dev_addr,
2224                                 desc->lli_phy.src,
2225                                 virt_to_phys(desc->lli_phy.src),
2226                                 chan->src_def_cfg,
2227                                 src_info, dst_info, flags);
2228
2229         ret = d40_phy_sg_to_lli(sg_dst, sg_len, dst_dev_addr,
2230                                 desc->lli_phy.dst,
2231                                 virt_to_phys(desc->lli_phy.dst),
2232                                 chan->dst_def_cfg,
2233                                 dst_info, src_info, flags);
2234
2235         dma_sync_single_for_device(chan->base->dev, desc->lli_pool.dma_addr,
2236                                    desc->lli_pool.size, DMA_TO_DEVICE);
2237
2238         return ret < 0 ? ret : 0;
2239 }
2240
2241 static struct d40_desc *
2242 d40_prep_desc(struct d40_chan *chan, struct scatterlist *sg,
2243               unsigned int sg_len, unsigned long dma_flags)
2244 {
2245         struct stedma40_chan_cfg *cfg = &chan->dma_cfg;
2246         struct d40_desc *desc;
2247         int ret;
2248
2249         desc = d40_desc_get(chan);
2250         if (!desc)
2251                 return NULL;
2252
2253         desc->lli_len = d40_sg_2_dmalen(sg, sg_len, cfg->src_info.data_width,
2254                                         cfg->dst_info.data_width);
2255         if (desc->lli_len < 0) {
2256                 chan_err(chan, "Unaligned size\n");
2257                 goto err;
2258         }
2259
2260         ret = d40_pool_lli_alloc(chan, desc, desc->lli_len);
2261         if (ret < 0) {
2262                 chan_err(chan, "Could not allocate lli\n");
2263                 goto err;
2264         }
2265
2266         desc->lli_current = 0;
2267         desc->txd.flags = dma_flags;
2268         desc->txd.tx_submit = d40_tx_submit;
2269
2270         dma_async_tx_descriptor_init(&desc->txd, &chan->chan);
2271
2272         return desc;
2273
2274 err:
2275         d40_desc_free(chan, desc);
2276         return NULL;
2277 }
2278
2279 static struct dma_async_tx_descriptor *
2280 d40_prep_sg(struct dma_chan *dchan, struct scatterlist *sg_src,
2281             struct scatterlist *sg_dst, unsigned int sg_len,
2282             enum dma_transfer_direction direction, unsigned long dma_flags)
2283 {
2284         struct d40_chan *chan = container_of(dchan, struct d40_chan, chan);
2285         dma_addr_t src_dev_addr = 0;
2286         dma_addr_t dst_dev_addr = 0;
2287         struct d40_desc *desc;
2288         unsigned long flags;
2289         int ret;
2290
2291         if (!chan->phy_chan) {
2292                 chan_err(chan, "Cannot prepare unallocated channel\n");
2293                 return NULL;
2294         }
2295
2296         spin_lock_irqsave(&chan->lock, flags);
2297
2298         desc = d40_prep_desc(chan, sg_src, sg_len, dma_flags);
2299         if (desc == NULL)
2300                 goto err;
2301
2302         if (sg_next(&sg_src[sg_len - 1]) == sg_src)
2303                 desc->cyclic = true;
2304
2305         if (direction == DMA_DEV_TO_MEM)
2306                 src_dev_addr = chan->runtime_addr;
2307         else if (direction == DMA_MEM_TO_DEV)
2308                 dst_dev_addr = chan->runtime_addr;
2309
2310         if (chan_is_logical(chan))
2311                 ret = d40_prep_sg_log(chan, desc, sg_src, sg_dst,
2312                                       sg_len, src_dev_addr, dst_dev_addr);
2313         else
2314                 ret = d40_prep_sg_phy(chan, desc, sg_src, sg_dst,
2315                                       sg_len, src_dev_addr, dst_dev_addr);
2316
2317         if (ret) {
2318                 chan_err(chan, "Failed to prepare %s sg job: %d\n",
2319                          chan_is_logical(chan) ? "log" : "phy", ret);
2320                 goto err;
2321         }
2322
2323         /*
2324          * add descriptor to the prepare queue in order to be able
2325          * to free them later in terminate_all
2326          */
2327         list_add_tail(&desc->node, &chan->prepare_queue);
2328
2329         spin_unlock_irqrestore(&chan->lock, flags);
2330
2331         return &desc->txd;
2332
2333 err:
2334         if (desc)
2335                 d40_desc_free(chan, desc);
2336         spin_unlock_irqrestore(&chan->lock, flags);
2337         return NULL;
2338 }
2339
2340 bool stedma40_filter(struct dma_chan *chan, void *data)
2341 {
2342         struct stedma40_chan_cfg *info = data;
2343         struct d40_chan *d40c =
2344                 container_of(chan, struct d40_chan, chan);
2345         int err;
2346
2347         if (data) {
2348                 err = d40_validate_conf(d40c, info);
2349                 if (!err)
2350                         d40c->dma_cfg = *info;
2351         } else
2352                 err = d40_config_memcpy(d40c);
2353
2354         if (!err)
2355                 d40c->configured = true;
2356
2357         return err == 0;
2358 }
2359 EXPORT_SYMBOL(stedma40_filter);
2360
2361 static void __d40_set_prio_rt(struct d40_chan *d40c, int dev_type, bool src)
2362 {
2363         bool realtime = d40c->dma_cfg.realtime;
2364         bool highprio = d40c->dma_cfg.high_priority;
2365         u32 rtreg;
2366         u32 event = D40_TYPE_TO_EVENT(dev_type);
2367         u32 group = D40_TYPE_TO_GROUP(dev_type);
2368         u32 bit = BIT(event);
2369         u32 prioreg;
2370         struct d40_gen_dmac *dmac = &d40c->base->gen_dmac;
2371
2372         rtreg = realtime ? dmac->realtime_en : dmac->realtime_clear;
2373         /*
2374          * Due to a hardware bug, in some cases a logical channel triggered by
2375          * a high priority destination event line can generate extra packet
2376          * transactions.
2377          *
2378          * The workaround is to not set the high priority level for the
2379          * destination event lines that trigger logical channels.
2380          */
2381         if (!src && chan_is_logical(d40c))
2382                 highprio = false;
2383
2384         prioreg = highprio ? dmac->high_prio_en : dmac->high_prio_clear;
2385
2386         /* Destination event lines are stored in the upper halfword */
2387         if (!src)
2388                 bit <<= 16;
2389
2390         writel(bit, d40c->base->virtbase + prioreg + group * 4);
2391         writel(bit, d40c->base->virtbase + rtreg + group * 4);
2392 }
2393
2394 static void d40_set_prio_realtime(struct d40_chan *d40c)
2395 {
2396         if (d40c->base->rev < 3)
2397                 return;
2398
2399         if ((d40c->dma_cfg.dir ==  DMA_DEV_TO_MEM) ||
2400             (d40c->dma_cfg.dir == DMA_DEV_TO_DEV))
2401                 __d40_set_prio_rt(d40c, d40c->dma_cfg.dev_type, true);
2402
2403         if ((d40c->dma_cfg.dir ==  DMA_MEM_TO_DEV) ||
2404             (d40c->dma_cfg.dir == DMA_DEV_TO_DEV))
2405                 __d40_set_prio_rt(d40c, d40c->dma_cfg.dev_type, false);
2406 }
2407
2408 #define D40_DT_FLAGS_MODE(flags)       ((flags >> 0) & 0x1)
2409 #define D40_DT_FLAGS_DIR(flags)        ((flags >> 1) & 0x1)
2410 #define D40_DT_FLAGS_BIG_ENDIAN(flags) ((flags >> 2) & 0x1)
2411 #define D40_DT_FLAGS_FIXED_CHAN(flags) ((flags >> 3) & 0x1)
2412 #define D40_DT_FLAGS_HIGH_PRIO(flags)  ((flags >> 4) & 0x1)
2413
2414 static struct dma_chan *d40_xlate(struct of_phandle_args *dma_spec,
2415                                   struct of_dma *ofdma)
2416 {
2417         struct stedma40_chan_cfg cfg;
2418         dma_cap_mask_t cap;
2419         u32 flags;
2420
2421         memset(&cfg, 0, sizeof(struct stedma40_chan_cfg));
2422
2423         dma_cap_zero(cap);
2424         dma_cap_set(DMA_SLAVE, cap);
2425
2426         cfg.dev_type = dma_spec->args[0];
2427         flags = dma_spec->args[2];
2428
2429         switch (D40_DT_FLAGS_MODE(flags)) {
2430         case 0: cfg.mode = STEDMA40_MODE_LOGICAL; break;
2431         case 1: cfg.mode = STEDMA40_MODE_PHYSICAL; break;
2432         }
2433
2434         switch (D40_DT_FLAGS_DIR(flags)) {
2435         case 0:
2436                 cfg.dir = DMA_MEM_TO_DEV;
2437                 cfg.dst_info.big_endian = D40_DT_FLAGS_BIG_ENDIAN(flags);
2438                 break;
2439         case 1:
2440                 cfg.dir = DMA_DEV_TO_MEM;
2441                 cfg.src_info.big_endian = D40_DT_FLAGS_BIG_ENDIAN(flags);
2442                 break;
2443         }
2444
2445         if (D40_DT_FLAGS_FIXED_CHAN(flags)) {
2446                 cfg.phy_channel = dma_spec->args[1];
2447                 cfg.use_fixed_channel = true;
2448         }
2449
2450         if (D40_DT_FLAGS_HIGH_PRIO(flags))
2451                 cfg.high_priority = true;
2452
2453         return dma_request_channel(cap, stedma40_filter, &cfg);
2454 }
2455
2456 /* DMA ENGINE functions */
2457 static int d40_alloc_chan_resources(struct dma_chan *chan)
2458 {
2459         int err;
2460         unsigned long flags;
2461         struct d40_chan *d40c =
2462                 container_of(chan, struct d40_chan, chan);
2463         bool is_free_phy;
2464         spin_lock_irqsave(&d40c->lock, flags);
2465
2466         dma_cookie_init(chan);
2467
2468         /* If no dma configuration is set use default configuration (memcpy) */
2469         if (!d40c->configured) {
2470                 err = d40_config_memcpy(d40c);
2471                 if (err) {
2472                         chan_err(d40c, "Failed to configure memcpy channel\n");
2473                         goto fail;
2474                 }
2475         }
2476
2477         err = d40_allocate_channel(d40c, &is_free_phy);
2478         if (err) {
2479                 chan_err(d40c, "Failed to allocate channel\n");
2480                 d40c->configured = false;
2481                 goto fail;
2482         }
2483
2484         pm_runtime_get_sync(d40c->base->dev);
2485
2486         d40_set_prio_realtime(d40c);
2487
2488         if (chan_is_logical(d40c)) {
2489                 if (d40c->dma_cfg.dir == DMA_DEV_TO_MEM)
2490                         d40c->lcpa = d40c->base->lcpa_base +
2491                                 d40c->dma_cfg.dev_type * D40_LCPA_CHAN_SIZE;
2492                 else
2493                         d40c->lcpa = d40c->base->lcpa_base +
2494                                 d40c->dma_cfg.dev_type *
2495                                 D40_LCPA_CHAN_SIZE + D40_LCPA_CHAN_DST_DELTA;
2496
2497                 /* Unmask the Global Interrupt Mask. */
2498                 d40c->src_def_cfg |= BIT(D40_SREG_CFG_LOG_GIM_POS);
2499                 d40c->dst_def_cfg |= BIT(D40_SREG_CFG_LOG_GIM_POS);
2500         }
2501
2502         dev_dbg(chan2dev(d40c), "allocated %s channel (phy %d%s)\n",
2503                  chan_is_logical(d40c) ? "logical" : "physical",
2504                  d40c->phy_chan->num,
2505                  d40c->dma_cfg.use_fixed_channel ? ", fixed" : "");
2506
2507
2508         /*
2509          * Only write channel configuration to the DMA if the physical
2510          * resource is free. In case of multiple logical channels
2511          * on the same physical resource, only the first write is necessary.
2512          */
2513         if (is_free_phy)
2514                 d40_config_write(d40c);
2515 fail:
2516         pm_runtime_mark_last_busy(d40c->base->dev);
2517         pm_runtime_put_autosuspend(d40c->base->dev);
2518         spin_unlock_irqrestore(&d40c->lock, flags);
2519         return err;
2520 }
2521
2522 static void d40_free_chan_resources(struct dma_chan *chan)
2523 {
2524         struct d40_chan *d40c =
2525                 container_of(chan, struct d40_chan, chan);
2526         int err;
2527         unsigned long flags;
2528
2529         if (d40c->phy_chan == NULL) {
2530                 chan_err(d40c, "Cannot free unallocated channel\n");
2531                 return;
2532         }
2533
2534         spin_lock_irqsave(&d40c->lock, flags);
2535
2536         err = d40_free_dma(d40c);
2537
2538         if (err)
2539                 chan_err(d40c, "Failed to free channel\n");
2540         spin_unlock_irqrestore(&d40c->lock, flags);
2541 }
2542
2543 static struct dma_async_tx_descriptor *d40_prep_memcpy(struct dma_chan *chan,
2544                                                        dma_addr_t dst,
2545                                                        dma_addr_t src,
2546                                                        size_t size,
2547                                                        unsigned long dma_flags)
2548 {
2549         struct scatterlist dst_sg;
2550         struct scatterlist src_sg;
2551
2552         sg_init_table(&dst_sg, 1);
2553         sg_init_table(&src_sg, 1);
2554
2555         sg_dma_address(&dst_sg) = dst;
2556         sg_dma_address(&src_sg) = src;
2557
2558         sg_dma_len(&dst_sg) = size;
2559         sg_dma_len(&src_sg) = size;
2560
2561         return d40_prep_sg(chan, &src_sg, &dst_sg, 1, DMA_NONE, dma_flags);
2562 }
2563
2564 static struct dma_async_tx_descriptor *
2565 d40_prep_memcpy_sg(struct dma_chan *chan,
2566                    struct scatterlist *dst_sg, unsigned int dst_nents,
2567                    struct scatterlist *src_sg, unsigned int src_nents,
2568                    unsigned long dma_flags)
2569 {
2570         if (dst_nents != src_nents)
2571                 return NULL;
2572
2573         return d40_prep_sg(chan, src_sg, dst_sg, src_nents, DMA_NONE, dma_flags);
2574 }
2575
2576 static struct dma_async_tx_descriptor *
2577 d40_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
2578                   unsigned int sg_len, enum dma_transfer_direction direction,
2579                   unsigned long dma_flags, void *context)
2580 {
2581         if (!is_slave_direction(direction))
2582                 return NULL;
2583
2584         return d40_prep_sg(chan, sgl, sgl, sg_len, direction, dma_flags);
2585 }
2586
2587 static struct dma_async_tx_descriptor *
2588 dma40_prep_dma_cyclic(struct dma_chan *chan, dma_addr_t dma_addr,
2589                      size_t buf_len, size_t period_len,
2590                      enum dma_transfer_direction direction, unsigned long flags,
2591                      void *context)
2592 {
2593         unsigned int periods = buf_len / period_len;
2594         struct dma_async_tx_descriptor *txd;
2595         struct scatterlist *sg;
2596         int i;
2597
2598         sg = kcalloc(periods + 1, sizeof(struct scatterlist), GFP_NOWAIT);
2599         if (!sg)
2600                 return NULL;
2601
2602         for (i = 0; i < periods; i++) {
2603                 sg_dma_address(&sg[i]) = dma_addr;
2604                 sg_dma_len(&sg[i]) = period_len;
2605                 dma_addr += period_len;
2606         }
2607
2608         sg[periods].offset = 0;
2609         sg_dma_len(&sg[periods]) = 0;
2610         sg[periods].page_link =
2611                 ((unsigned long)sg | 0x01) & ~0x02;
2612
2613         txd = d40_prep_sg(chan, sg, sg, periods, direction,
2614                           DMA_PREP_INTERRUPT);
2615
2616         kfree(sg);
2617
2618         return txd;
2619 }
2620
2621 static enum dma_status d40_tx_status(struct dma_chan *chan,
2622                                      dma_cookie_t cookie,
2623                                      struct dma_tx_state *txstate)
2624 {
2625         struct d40_chan *d40c = container_of(chan, struct d40_chan, chan);
2626         enum dma_status ret;
2627
2628         if (d40c->phy_chan == NULL) {
2629                 chan_err(d40c, "Cannot read status of unallocated channel\n");
2630                 return -EINVAL;
2631         }
2632
2633         ret = dma_cookie_status(chan, cookie, txstate);
2634         if (ret != DMA_COMPLETE)
2635                 dma_set_residue(txstate, stedma40_residue(chan));
2636
2637         if (d40_is_paused(d40c))
2638                 ret = DMA_PAUSED;
2639
2640         return ret;
2641 }
2642
2643 static void d40_issue_pending(struct dma_chan *chan)
2644 {
2645         struct d40_chan *d40c = container_of(chan, struct d40_chan, chan);
2646         unsigned long flags;
2647
2648         if (d40c->phy_chan == NULL) {
2649                 chan_err(d40c, "Channel is not allocated!\n");
2650                 return;
2651         }
2652
2653         spin_lock_irqsave(&d40c->lock, flags);
2654
2655         list_splice_tail_init(&d40c->pending_queue, &d40c->queue);
2656
2657         /* Busy means that queued jobs are already being processed */
2658         if (!d40c->busy)
2659                 (void) d40_queue_start(d40c);
2660
2661         spin_unlock_irqrestore(&d40c->lock, flags);
2662 }
2663
2664 static void d40_terminate_all(struct dma_chan *chan)
2665 {
2666         unsigned long flags;
2667         struct d40_chan *d40c = container_of(chan, struct d40_chan, chan);
2668         int ret;
2669
2670         spin_lock_irqsave(&d40c->lock, flags);
2671
2672         pm_runtime_get_sync(d40c->base->dev);
2673         ret = d40_channel_execute_command(d40c, D40_DMA_STOP);
2674         if (ret)
2675                 chan_err(d40c, "Failed to stop channel\n");
2676
2677         d40_term_all(d40c);
2678         pm_runtime_mark_last_busy(d40c->base->dev);
2679         pm_runtime_put_autosuspend(d40c->base->dev);
2680         if (d40c->busy) {
2681                 pm_runtime_mark_last_busy(d40c->base->dev);
2682                 pm_runtime_put_autosuspend(d40c->base->dev);
2683         }
2684         d40c->busy = false;
2685
2686         spin_unlock_irqrestore(&d40c->lock, flags);
2687 }
2688
2689 static int
2690 dma40_config_to_halfchannel(struct d40_chan *d40c,
2691                             struct stedma40_half_channel_info *info,
2692                             u32 maxburst)
2693 {
2694         int psize;
2695
2696         if (chan_is_logical(d40c)) {
2697                 if (maxburst >= 16)
2698                         psize = STEDMA40_PSIZE_LOG_16;
2699                 else if (maxburst >= 8)
2700                         psize = STEDMA40_PSIZE_LOG_8;
2701                 else if (maxburst >= 4)
2702                         psize = STEDMA40_PSIZE_LOG_4;
2703                 else
2704                         psize = STEDMA40_PSIZE_LOG_1;
2705         } else {
2706                 if (maxburst >= 16)
2707                         psize = STEDMA40_PSIZE_PHY_16;
2708                 else if (maxburst >= 8)
2709                         psize = STEDMA40_PSIZE_PHY_8;
2710                 else if (maxburst >= 4)
2711                         psize = STEDMA40_PSIZE_PHY_4;
2712                 else
2713                         psize = STEDMA40_PSIZE_PHY_1;
2714         }
2715
2716         info->psize = psize;
2717         info->flow_ctrl = STEDMA40_NO_FLOW_CTRL;
2718
2719         return 0;
2720 }
2721
2722 /* Runtime reconfiguration extension */
2723 static int d40_set_runtime_config(struct dma_chan *chan,
2724                                   struct dma_slave_config *config)
2725 {
2726         struct d40_chan *d40c = container_of(chan, struct d40_chan, chan);
2727         struct stedma40_chan_cfg *cfg = &d40c->dma_cfg;
2728         enum dma_slave_buswidth src_addr_width, dst_addr_width;
2729         dma_addr_t config_addr;
2730         u32 src_maxburst, dst_maxburst;
2731         int ret;
2732
2733         src_addr_width = config->src_addr_width;
2734         src_maxburst = config->src_maxburst;
2735         dst_addr_width = config->dst_addr_width;
2736         dst_maxburst = config->dst_maxburst;
2737
2738         if (config->direction == DMA_DEV_TO_MEM) {
2739                 config_addr = config->src_addr;
2740
2741                 if (cfg->dir != DMA_DEV_TO_MEM)
2742                         dev_dbg(d40c->base->dev,
2743                                 "channel was not configured for peripheral "
2744                                 "to memory transfer (%d) overriding\n",
2745                                 cfg->dir);
2746                 cfg->dir = DMA_DEV_TO_MEM;
2747
2748                 /* Configure the memory side */
2749                 if (dst_addr_width == DMA_SLAVE_BUSWIDTH_UNDEFINED)
2750                         dst_addr_width = src_addr_width;
2751                 if (dst_maxburst == 0)
2752                         dst_maxburst = src_maxburst;
2753
2754         } else if (config->direction == DMA_MEM_TO_DEV) {
2755                 config_addr = config->dst_addr;
2756
2757                 if (cfg->dir != DMA_MEM_TO_DEV)
2758                         dev_dbg(d40c->base->dev,
2759                                 "channel was not configured for memory "
2760                                 "to peripheral transfer (%d) overriding\n",
2761                                 cfg->dir);
2762                 cfg->dir = DMA_MEM_TO_DEV;
2763
2764                 /* Configure the memory side */
2765                 if (src_addr_width == DMA_SLAVE_BUSWIDTH_UNDEFINED)
2766                         src_addr_width = dst_addr_width;
2767                 if (src_maxburst == 0)
2768                         src_maxburst = dst_maxburst;
2769         } else {
2770                 dev_err(d40c->base->dev,
2771                         "unrecognized channel direction %d\n",
2772                         config->direction);
2773                 return -EINVAL;
2774         }
2775
2776         if (config_addr <= 0) {
2777                 dev_err(d40c->base->dev, "no address supplied\n");
2778                 return -EINVAL;
2779         }
2780
2781         if (src_maxburst * src_addr_width != dst_maxburst * dst_addr_width) {
2782                 dev_err(d40c->base->dev,
2783                         "src/dst width/maxburst mismatch: %d*%d != %d*%d\n",
2784                         src_maxburst,
2785                         src_addr_width,
2786                         dst_maxburst,
2787                         dst_addr_width);
2788                 return -EINVAL;
2789         }
2790
2791         if (src_maxburst > 16) {
2792                 src_maxburst = 16;
2793                 dst_maxburst = src_maxburst * src_addr_width / dst_addr_width;
2794         } else if (dst_maxburst > 16) {
2795                 dst_maxburst = 16;
2796                 src_maxburst = dst_maxburst * dst_addr_width / src_addr_width;
2797         }
2798
2799         /* Only valid widths are; 1, 2, 4 and 8. */
2800         if (src_addr_width <= DMA_SLAVE_BUSWIDTH_UNDEFINED ||
2801             src_addr_width >  DMA_SLAVE_BUSWIDTH_8_BYTES   ||
2802             dst_addr_width <= DMA_SLAVE_BUSWIDTH_UNDEFINED ||
2803             dst_addr_width >  DMA_SLAVE_BUSWIDTH_8_BYTES   ||
2804             !is_power_of_2(src_addr_width) ||
2805             !is_power_of_2(dst_addr_width))
2806                 return -EINVAL;
2807
2808         cfg->src_info.data_width = src_addr_width;
2809         cfg->dst_info.data_width = dst_addr_width;
2810
2811         ret = dma40_config_to_halfchannel(d40c, &cfg->src_info,
2812                                           src_maxburst);
2813         if (ret)
2814                 return ret;
2815
2816         ret = dma40_config_to_halfchannel(d40c, &cfg->dst_info,
2817                                           dst_maxburst);
2818         if (ret)
2819                 return ret;
2820
2821         /* Fill in register values */
2822         if (chan_is_logical(d40c))
2823                 d40_log_cfg(cfg, &d40c->log_def.lcsp1, &d40c->log_def.lcsp3);
2824         else
2825                 d40_phy_cfg(cfg, &d40c->src_def_cfg, &d40c->dst_def_cfg);
2826
2827         /* These settings will take precedence later */
2828         d40c->runtime_addr = config_addr;
2829         d40c->runtime_direction = config->direction;
2830         dev_dbg(d40c->base->dev,
2831                 "configured channel %s for %s, data width %d/%d, "
2832                 "maxburst %d/%d elements, LE, no flow control\n",
2833                 dma_chan_name(chan),
2834                 (config->direction == DMA_DEV_TO_MEM) ? "RX" : "TX",
2835                 src_addr_width, dst_addr_width,
2836                 src_maxburst, dst_maxburst);
2837
2838         return 0;
2839 }
2840
2841 static int d40_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
2842                        unsigned long arg)
2843 {
2844         struct d40_chan *d40c = container_of(chan, struct d40_chan, chan);
2845
2846         if (d40c->phy_chan == NULL) {
2847                 chan_err(d40c, "Channel is not allocated!\n");
2848                 return -EINVAL;
2849         }
2850
2851         switch (cmd) {
2852         case DMA_TERMINATE_ALL:
2853                 d40_terminate_all(chan);
2854                 return 0;
2855         case DMA_PAUSE:
2856                 return d40_pause(d40c);
2857         case DMA_RESUME:
2858                 return d40_resume(d40c);
2859         case DMA_SLAVE_CONFIG:
2860                 return d40_set_runtime_config(chan,
2861                         (struct dma_slave_config *) arg);
2862         default:
2863                 break;
2864         }
2865
2866         /* Other commands are unimplemented */
2867         return -ENXIO;
2868 }
2869
2870 /* Initialization functions */
2871
2872 static void __init d40_chan_init(struct d40_base *base, struct dma_device *dma,
2873                                  struct d40_chan *chans, int offset,
2874                                  int num_chans)
2875 {
2876         int i = 0;
2877         struct d40_chan *d40c;
2878
2879         INIT_LIST_HEAD(&dma->channels);
2880
2881         for (i = offset; i < offset + num_chans; i++) {
2882                 d40c = &chans[i];
2883                 d40c->base = base;
2884                 d40c->chan.device = dma;
2885
2886                 spin_lock_init(&d40c->lock);
2887
2888                 d40c->log_num = D40_PHY_CHAN;
2889
2890                 INIT_LIST_HEAD(&d40c->done);
2891                 INIT_LIST_HEAD(&d40c->active);
2892                 INIT_LIST_HEAD(&d40c->queue);
2893                 INIT_LIST_HEAD(&d40c->pending_queue);
2894                 INIT_LIST_HEAD(&d40c->client);
2895                 INIT_LIST_HEAD(&d40c->prepare_queue);
2896
2897                 tasklet_init(&d40c->tasklet, dma_tasklet,
2898                              (unsigned long) d40c);
2899
2900                 list_add_tail(&d40c->chan.device_node,
2901                               &dma->channels);
2902         }
2903 }
2904
2905 static void d40_ops_init(struct d40_base *base, struct dma_device *dev)
2906 {
2907         if (dma_has_cap(DMA_SLAVE, dev->cap_mask))
2908                 dev->device_prep_slave_sg = d40_prep_slave_sg;
2909
2910         if (dma_has_cap(DMA_MEMCPY, dev->cap_mask)) {
2911                 dev->device_prep_dma_memcpy = d40_prep_memcpy;
2912
2913                 /*
2914                  * This controller can only access address at even
2915                  * 32bit boundaries, i.e. 2^2
2916                  */
2917                 dev->copy_align = 2;
2918         }
2919
2920         if (dma_has_cap(DMA_SG, dev->cap_mask))
2921                 dev->device_prep_dma_sg = d40_prep_memcpy_sg;
2922
2923         if (dma_has_cap(DMA_CYCLIC, dev->cap_mask))
2924                 dev->device_prep_dma_cyclic = dma40_prep_dma_cyclic;
2925
2926         dev->device_alloc_chan_resources = d40_alloc_chan_resources;
2927         dev->device_free_chan_resources = d40_free_chan_resources;
2928         dev->device_issue_pending = d40_issue_pending;
2929         dev->device_tx_status = d40_tx_status;
2930         dev->device_control = d40_control;
2931         dev->dev = base->dev;
2932 }
2933
2934 static int __init d40_dmaengine_init(struct d40_base *base,
2935                                      int num_reserved_chans)
2936 {
2937         int err ;
2938
2939         d40_chan_init(base, &base->dma_slave, base->log_chans,
2940                       0, base->num_log_chans);
2941
2942         dma_cap_zero(base->dma_slave.cap_mask);
2943         dma_cap_set(DMA_SLAVE, base->dma_slave.cap_mask);
2944         dma_cap_set(DMA_CYCLIC, base->dma_slave.cap_mask);
2945
2946         d40_ops_init(base, &base->dma_slave);
2947
2948         err = dma_async_device_register(&base->dma_slave);
2949
2950         if (err) {
2951                 d40_err(base->dev, "Failed to register slave channels\n");
2952                 goto failure1;
2953         }
2954
2955         d40_chan_init(base, &base->dma_memcpy, base->log_chans,
2956                       base->num_log_chans, base->num_memcpy_chans);
2957
2958         dma_cap_zero(base->dma_memcpy.cap_mask);
2959         dma_cap_set(DMA_MEMCPY, base->dma_memcpy.cap_mask);
2960         dma_cap_set(DMA_SG, base->dma_memcpy.cap_mask);
2961
2962         d40_ops_init(base, &base->dma_memcpy);
2963
2964         err = dma_async_device_register(&base->dma_memcpy);
2965
2966         if (err) {
2967                 d40_err(base->dev,
2968                         "Failed to regsiter memcpy only channels\n");
2969                 goto failure2;
2970         }
2971
2972         d40_chan_init(base, &base->dma_both, base->phy_chans,
2973                       0, num_reserved_chans);
2974
2975         dma_cap_zero(base->dma_both.cap_mask);
2976         dma_cap_set(DMA_SLAVE, base->dma_both.cap_mask);
2977         dma_cap_set(DMA_MEMCPY, base->dma_both.cap_mask);
2978         dma_cap_set(DMA_SG, base->dma_both.cap_mask);
2979         dma_cap_set(DMA_CYCLIC, base->dma_slave.cap_mask);
2980
2981         d40_ops_init(base, &base->dma_both);
2982         err = dma_async_device_register(&base->dma_both);
2983
2984         if (err) {
2985                 d40_err(base->dev,
2986                         "Failed to register logical and physical capable channels\n");
2987                 goto failure3;
2988         }
2989         return 0;
2990 failure3:
2991         dma_async_device_unregister(&base->dma_memcpy);
2992 failure2:
2993         dma_async_device_unregister(&base->dma_slave);
2994 failure1:
2995         return err;
2996 }
2997
2998 /* Suspend resume functionality */
2999 #ifdef CONFIG_PM
3000 static int dma40_pm_suspend(struct device *dev)
3001 {
3002         struct platform_device *pdev = to_platform_device(dev);
3003         struct d40_base *base = platform_get_drvdata(pdev);
3004         int ret = 0;
3005
3006         if (base->lcpa_regulator)
3007                 ret = regulator_disable(base->lcpa_regulator);
3008         return ret;
3009 }
3010
3011 static int dma40_runtime_suspend(struct device *dev)
3012 {
3013         struct platform_device *pdev = to_platform_device(dev);
3014         struct d40_base *base = platform_get_drvdata(pdev);
3015
3016         d40_save_restore_registers(base, true);
3017
3018         /* Don't disable/enable clocks for v1 due to HW bugs */
3019         if (base->rev != 1)
3020                 writel_relaxed(base->gcc_pwr_off_mask,
3021                                base->virtbase + D40_DREG_GCC);
3022
3023         return 0;
3024 }
3025
3026 static int dma40_runtime_resume(struct device *dev)
3027 {
3028         struct platform_device *pdev = to_platform_device(dev);
3029         struct d40_base *base = platform_get_drvdata(pdev);
3030
3031         if (base->initialized)
3032                 d40_save_restore_registers(base, false);
3033
3034         writel_relaxed(D40_DREG_GCC_ENABLE_ALL,
3035                        base->virtbase + D40_DREG_GCC);
3036         return 0;
3037 }
3038
3039 static int dma40_resume(struct device *dev)
3040 {
3041         struct platform_device *pdev = to_platform_device(dev);
3042         struct d40_base *base = platform_get_drvdata(pdev);
3043         int ret = 0;
3044
3045         if (base->lcpa_regulator)
3046                 ret = regulator_enable(base->lcpa_regulator);
3047
3048         return ret;
3049 }
3050
3051 static const struct dev_pm_ops dma40_pm_ops = {
3052         .suspend                = dma40_pm_suspend,
3053         .runtime_suspend        = dma40_runtime_suspend,
3054         .runtime_resume         = dma40_runtime_resume,
3055         .resume                 = dma40_resume,
3056 };
3057 #define DMA40_PM_OPS    (&dma40_pm_ops)
3058 #else
3059 #define DMA40_PM_OPS    NULL
3060 #endif
3061
3062 /* Initialization functions. */
3063
3064 static int __init d40_phy_res_init(struct d40_base *base)
3065 {
3066         int i;
3067         int num_phy_chans_avail = 0;
3068         u32 val[2];
3069         int odd_even_bit = -2;
3070         int gcc = D40_DREG_GCC_ENA;
3071
3072         val[0] = readl(base->virtbase + D40_DREG_PRSME);
3073         val[1] = readl(base->virtbase + D40_DREG_PRSMO);
3074
3075         for (i = 0; i < base->num_phy_chans; i++) {
3076                 base->phy_res[i].num = i;
3077                 odd_even_bit += 2 * ((i % 2) == 0);
3078                 if (((val[i % 2] >> odd_even_bit) & 3) == 1) {
3079                         /* Mark security only channels as occupied */
3080                         base->phy_res[i].allocated_src = D40_ALLOC_PHY;
3081                         base->phy_res[i].allocated_dst = D40_ALLOC_PHY;
3082                         base->phy_res[i].reserved = true;
3083                         gcc |= D40_DREG_GCC_EVTGRP_ENA(D40_PHYS_TO_GROUP(i),
3084                                                        D40_DREG_GCC_SRC);
3085                         gcc |= D40_DREG_GCC_EVTGRP_ENA(D40_PHYS_TO_GROUP(i),
3086                                                        D40_DREG_GCC_DST);
3087
3088
3089                 } else {
3090                         base->phy_res[i].allocated_src = D40_ALLOC_FREE;
3091                         base->phy_res[i].allocated_dst = D40_ALLOC_FREE;
3092                         base->phy_res[i].reserved = false;
3093                         num_phy_chans_avail++;
3094                 }
3095                 spin_lock_init(&base->phy_res[i].lock);
3096         }
3097
3098         /* Mark disabled channels as occupied */
3099         for (i = 0; base->plat_data->disabled_channels[i] != -1; i++) {
3100                 int chan = base->plat_data->disabled_channels[i];
3101
3102                 base->phy_res[chan].allocated_src = D40_ALLOC_PHY;
3103                 base->phy_res[chan].allocated_dst = D40_ALLOC_PHY;
3104                 base->phy_res[chan].reserved = true;
3105                 gcc |= D40_DREG_GCC_EVTGRP_ENA(D40_PHYS_TO_GROUP(chan),
3106                                                D40_DREG_GCC_SRC);
3107                 gcc |= D40_DREG_GCC_EVTGRP_ENA(D40_PHYS_TO_GROUP(chan),
3108                                                D40_DREG_GCC_DST);
3109                 num_phy_chans_avail--;
3110         }
3111
3112         /* Mark soft_lli channels */
3113         for (i = 0; i < base->plat_data->num_of_soft_lli_chans; i++) {
3114                 int chan = base->plat_data->soft_lli_chans[i];
3115
3116                 base->phy_res[chan].use_soft_lli = true;
3117         }
3118
3119         dev_info(base->dev, "%d of %d physical DMA channels available\n",
3120                  num_phy_chans_avail, base->num_phy_chans);
3121
3122         /* Verify settings extended vs standard */
3123         val[0] = readl(base->virtbase + D40_DREG_PRTYP);
3124
3125         for (i = 0; i < base->num_phy_chans; i++) {
3126
3127                 if (base->phy_res[i].allocated_src == D40_ALLOC_FREE &&
3128                     (val[0] & 0x3) != 1)
3129                         dev_info(base->dev,
3130                                  "[%s] INFO: channel %d is misconfigured (%d)\n",
3131                                  __func__, i, val[0] & 0x3);
3132
3133                 val[0] = val[0] >> 2;
3134         }
3135
3136         /*
3137          * To keep things simple, Enable all clocks initially.
3138          * The clocks will get managed later post channel allocation.
3139          * The clocks for the event lines on which reserved channels exists
3140          * are not managed here.
3141          */
3142         writel(D40_DREG_GCC_ENABLE_ALL, base->virtbase + D40_DREG_GCC);
3143         base->gcc_pwr_off_mask = gcc;
3144
3145         return num_phy_chans_avail;
3146 }
3147
3148 static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev)
3149 {
3150         struct stedma40_platform_data *plat_data = dev_get_platdata(&pdev->dev);
3151         struct clk *clk = NULL;
3152         void __iomem *virtbase = NULL;
3153         struct resource *res = NULL;
3154         struct d40_base *base = NULL;
3155         int num_log_chans = 0;
3156         int num_phy_chans;
3157         int num_memcpy_chans;
3158         int clk_ret = -EINVAL;
3159         int i;
3160         u32 pid;
3161         u32 cid;
3162         u8 rev;
3163
3164         clk = clk_get(&pdev->dev, NULL);
3165         if (IS_ERR(clk)) {
3166                 d40_err(&pdev->dev, "No matching clock found\n");
3167                 goto failure;
3168         }
3169
3170         clk_ret = clk_prepare_enable(clk);
3171         if (clk_ret) {
3172                 d40_err(&pdev->dev, "Failed to prepare/enable clock\n");
3173                 goto failure;
3174         }
3175
3176         /* Get IO for DMAC base address */
3177         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "base");
3178         if (!res)
3179                 goto failure;
3180
3181         if (request_mem_region(res->start, resource_size(res),
3182                                D40_NAME " I/O base") == NULL)
3183                 goto failure;
3184
3185         virtbase = ioremap(res->start, resource_size(res));
3186         if (!virtbase)
3187                 goto failure;
3188
3189         /* This is just a regular AMBA PrimeCell ID actually */
3190         for (pid = 0, i = 0; i < 4; i++)
3191                 pid |= (readl(virtbase + resource_size(res) - 0x20 + 4 * i)
3192                         & 255) << (i * 8);
3193         for (cid = 0, i = 0; i < 4; i++)
3194                 cid |= (readl(virtbase + resource_size(res) - 0x10 + 4 * i)
3195                         & 255) << (i * 8);
3196
3197         if (cid != AMBA_CID) {
3198                 d40_err(&pdev->dev, "Unknown hardware! No PrimeCell ID\n");
3199                 goto failure;
3200         }
3201         if (AMBA_MANF_BITS(pid) != AMBA_VENDOR_ST) {
3202                 d40_err(&pdev->dev, "Unknown designer! Got %x wanted %x\n",
3203                         AMBA_MANF_BITS(pid),
3204                         AMBA_VENDOR_ST);
3205                 goto failure;
3206         }
3207         /*
3208          * HW revision:
3209          * DB8500ed has revision 0
3210          * ? has revision 1
3211          * DB8500v1 has revision 2
3212          * DB8500v2 has revision 3
3213          * AP9540v1 has revision 4
3214          * DB8540v1 has revision 4
3215          */
3216         rev = AMBA_REV_BITS(pid);
3217         if (rev < 2) {
3218                 d40_err(&pdev->dev, "hardware revision: %d is not supported", rev);
3219                 goto failure;
3220         }
3221
3222         /* The number of physical channels on this HW */
3223         if (plat_data->num_of_phy_chans)
3224                 num_phy_chans = plat_data->num_of_phy_chans;
3225         else
3226                 num_phy_chans = 4 * (readl(virtbase + D40_DREG_ICFG) & 0x7) + 4;
3227
3228         /* The number of channels used for memcpy */
3229         if (plat_data->num_of_memcpy_chans)
3230                 num_memcpy_chans = plat_data->num_of_memcpy_chans;
3231         else
3232                 num_memcpy_chans = ARRAY_SIZE(dma40_memcpy_channels);
3233
3234         num_log_chans = num_phy_chans * D40_MAX_LOG_CHAN_PER_PHY;
3235
3236         dev_info(&pdev->dev,
3237                  "hardware rev: %d @ %pa with %d physical and %d logical channels\n",
3238                  rev, &res->start, num_phy_chans, num_log_chans);
3239
3240         base = kzalloc(ALIGN(sizeof(struct d40_base), 4) +
3241                        (num_phy_chans + num_log_chans + num_memcpy_chans) *
3242                        sizeof(struct d40_chan), GFP_KERNEL);
3243
3244         if (base == NULL) {
3245                 d40_err(&pdev->dev, "Out of memory\n");
3246                 goto failure;
3247         }
3248
3249         base->rev = rev;
3250         base->clk = clk;
3251         base->num_memcpy_chans = num_memcpy_chans;
3252         base->num_phy_chans = num_phy_chans;
3253         base->num_log_chans = num_log_chans;
3254         base->phy_start = res->start;
3255         base->phy_size = resource_size(res);
3256         base->virtbase = virtbase;
3257         base->plat_data = plat_data;
3258         base->dev = &pdev->dev;
3259         base->phy_chans = ((void *)base) + ALIGN(sizeof(struct d40_base), 4);
3260         base->log_chans = &base->phy_chans[num_phy_chans];
3261
3262         if (base->plat_data->num_of_phy_chans == 14) {
3263                 base->gen_dmac.backup = d40_backup_regs_v4b;
3264                 base->gen_dmac.backup_size = BACKUP_REGS_SZ_V4B;
3265                 base->gen_dmac.interrupt_en = D40_DREG_CPCMIS;
3266                 base->gen_dmac.interrupt_clear = D40_DREG_CPCICR;
3267                 base->gen_dmac.realtime_en = D40_DREG_CRSEG1;
3268                 base->gen_dmac.realtime_clear = D40_DREG_CRCEG1;
3269                 base->gen_dmac.high_prio_en = D40_DREG_CPSEG1;
3270                 base->gen_dmac.high_prio_clear = D40_DREG_CPCEG1;
3271                 base->gen_dmac.il = il_v4b;
3272                 base->gen_dmac.il_size = ARRAY_SIZE(il_v4b);
3273                 base->gen_dmac.init_reg = dma_init_reg_v4b;
3274                 base->gen_dmac.init_reg_size = ARRAY_SIZE(dma_init_reg_v4b);
3275         } else {
3276                 if (base->rev >= 3) {
3277                         base->gen_dmac.backup = d40_backup_regs_v4a;
3278                         base->gen_dmac.backup_size = BACKUP_REGS_SZ_V4A;
3279                 }
3280                 base->gen_dmac.interrupt_en = D40_DREG_PCMIS;
3281                 base->gen_dmac.interrupt_clear = D40_DREG_PCICR;
3282                 base->gen_dmac.realtime_en = D40_DREG_RSEG1;
3283                 base->gen_dmac.realtime_clear = D40_DREG_RCEG1;
3284                 base->gen_dmac.high_prio_en = D40_DREG_PSEG1;
3285                 base->gen_dmac.high_prio_clear = D40_DREG_PCEG1;
3286                 base->gen_dmac.il = il_v4a;
3287                 base->gen_dmac.il_size = ARRAY_SIZE(il_v4a);
3288                 base->gen_dmac.init_reg = dma_init_reg_v4a;
3289                 base->gen_dmac.init_reg_size = ARRAY_SIZE(dma_init_reg_v4a);
3290         }
3291
3292         base->phy_res = kzalloc(num_phy_chans * sizeof(struct d40_phy_res),
3293                                 GFP_KERNEL);
3294         if (!base->phy_res)
3295                 goto failure;
3296
3297         base->lookup_phy_chans = kzalloc(num_phy_chans *
3298                                          sizeof(struct d40_chan *),
3299                                          GFP_KERNEL);
3300         if (!base->lookup_phy_chans)
3301                 goto failure;
3302
3303         base->lookup_log_chans = kzalloc(num_log_chans *
3304                                          sizeof(struct d40_chan *),
3305                                          GFP_KERNEL);
3306         if (!base->lookup_log_chans)
3307                 goto failure;
3308
3309         base->reg_val_backup_chan = kmalloc(base->num_phy_chans *
3310                                             sizeof(d40_backup_regs_chan),
3311                                             GFP_KERNEL);
3312         if (!base->reg_val_backup_chan)
3313                 goto failure;
3314
3315         base->lcla_pool.alloc_map =
3316                 kzalloc(num_phy_chans * sizeof(struct d40_desc *)
3317                         * D40_LCLA_LINK_PER_EVENT_GRP, GFP_KERNEL);
3318         if (!base->lcla_pool.alloc_map)
3319                 goto failure;
3320
3321         base->desc_slab = kmem_cache_create(D40_NAME, sizeof(struct d40_desc),
3322                                             0, SLAB_HWCACHE_ALIGN,
3323                                             NULL);
3324         if (base->desc_slab == NULL)
3325                 goto failure;
3326
3327         return base;
3328
3329 failure:
3330         if (!clk_ret)
3331                 clk_disable_unprepare(clk);
3332         if (!IS_ERR(clk))
3333                 clk_put(clk);
3334         if (virtbase)
3335                 iounmap(virtbase);
3336         if (res)
3337                 release_mem_region(res->start,
3338                                    resource_size(res));
3339         if (virtbase)
3340                 iounmap(virtbase);
3341
3342         if (base) {
3343                 kfree(base->lcla_pool.alloc_map);
3344                 kfree(base->reg_val_backup_chan);
3345                 kfree(base->lookup_log_chans);
3346                 kfree(base->lookup_phy_chans);
3347                 kfree(base->phy_res);
3348                 kfree(base);
3349         }
3350
3351         return NULL;
3352 }
3353
3354 static void __init d40_hw_init(struct d40_base *base)
3355 {
3356
3357         int i;
3358         u32 prmseo[2] = {0, 0};
3359         u32 activeo[2] = {0xFFFFFFFF, 0xFFFFFFFF};
3360         u32 pcmis = 0;
3361         u32 pcicr = 0;
3362         struct d40_reg_val *dma_init_reg = base->gen_dmac.init_reg;
3363         u32 reg_size = base->gen_dmac.init_reg_size;
3364
3365         for (i = 0; i < reg_size; i++)
3366                 writel(dma_init_reg[i].val,
3367                        base->virtbase + dma_init_reg[i].reg);
3368
3369         /* Configure all our dma channels to default settings */
3370         for (i = 0; i < base->num_phy_chans; i++) {
3371
3372                 activeo[i % 2] = activeo[i % 2] << 2;
3373
3374                 if (base->phy_res[base->num_phy_chans - i - 1].allocated_src
3375                     == D40_ALLOC_PHY) {
3376                         activeo[i % 2] |= 3;
3377                         continue;
3378                 }
3379
3380                 /* Enable interrupt # */
3381                 pcmis = (pcmis << 1) | 1;
3382
3383                 /* Clear interrupt # */
3384                 pcicr = (pcicr << 1) | 1;
3385
3386                 /* Set channel to physical mode */
3387                 prmseo[i % 2] = prmseo[i % 2] << 2;
3388                 prmseo[i % 2] |= 1;
3389
3390         }
3391
3392         writel(prmseo[1], base->virtbase + D40_DREG_PRMSE);
3393         writel(prmseo[0], base->virtbase + D40_DREG_PRMSO);
3394         writel(activeo[1], base->virtbase + D40_DREG_ACTIVE);
3395         writel(activeo[0], base->virtbase + D40_DREG_ACTIVO);
3396
3397         /* Write which interrupt to enable */
3398         writel(pcmis, base->virtbase + base->gen_dmac.interrupt_en);
3399
3400         /* Write which interrupt to clear */
3401         writel(pcicr, base->virtbase + base->gen_dmac.interrupt_clear);
3402
3403         /* These are __initdata and cannot be accessed after init */
3404         base->gen_dmac.init_reg = NULL;
3405         base->gen_dmac.init_reg_size = 0;
3406 }
3407
3408 static int __init d40_lcla_allocate(struct d40_base *base)
3409 {
3410         struct d40_lcla_pool *pool = &base->lcla_pool;
3411         unsigned long *page_list;
3412         int i, j;
3413         int ret = 0;
3414
3415         /*
3416          * This is somewhat ugly. We need 8192 bytes that are 18 bit aligned,
3417          * To full fill this hardware requirement without wasting 256 kb
3418          * we allocate pages until we get an aligned one.
3419          */
3420         page_list = kmalloc(sizeof(unsigned long) * MAX_LCLA_ALLOC_ATTEMPTS,
3421                             GFP_KERNEL);
3422
3423         if (!page_list) {
3424                 ret = -ENOMEM;
3425                 goto failure;
3426         }
3427
3428         /* Calculating how many pages that are required */
3429         base->lcla_pool.pages = SZ_1K * base->num_phy_chans / PAGE_SIZE;
3430
3431         for (i = 0; i < MAX_LCLA_ALLOC_ATTEMPTS; i++) {
3432                 page_list[i] = __get_free_pages(GFP_KERNEL,
3433                                                 base->lcla_pool.pages);
3434                 if (!page_list[i]) {
3435
3436                         d40_err(base->dev, "Failed to allocate %d pages.\n",
3437                                 base->lcla_pool.pages);
3438
3439                         for (j = 0; j < i; j++)
3440                                 free_pages(page_list[j], base->lcla_pool.pages);
3441                         goto failure;
3442                 }
3443
3444                 if ((virt_to_phys((void *)page_list[i]) &
3445                      (LCLA_ALIGNMENT - 1)) == 0)
3446                         break;
3447         }
3448
3449         for (j = 0; j < i; j++)
3450                 free_pages(page_list[j], base->lcla_pool.pages);
3451
3452         if (i < MAX_LCLA_ALLOC_ATTEMPTS) {
3453                 base->lcla_pool.base = (void *)page_list[i];
3454         } else {
3455                 /*
3456                  * After many attempts and no succees with finding the correct
3457                  * alignment, try with allocating a big buffer.
3458                  */
3459                 dev_warn(base->dev,
3460                          "[%s] Failed to get %d pages @ 18 bit align.\n",
3461                          __func__, base->lcla_pool.pages);
3462                 base->lcla_pool.base_unaligned = kmalloc(SZ_1K *
3463                                                          base->num_phy_chans +
3464                                                          LCLA_ALIGNMENT,
3465                                                          GFP_KERNEL);
3466                 if (!base->lcla_pool.base_unaligned) {
3467                         ret = -ENOMEM;
3468                         goto failure;
3469                 }
3470
3471                 base->lcla_pool.base = PTR_ALIGN(base->lcla_pool.base_unaligned,
3472                                                  LCLA_ALIGNMENT);
3473         }
3474
3475         pool->dma_addr = dma_map_single(base->dev, pool->base,
3476                                         SZ_1K * base->num_phy_chans,
3477                                         DMA_TO_DEVICE);
3478         if (dma_mapping_error(base->dev, pool->dma_addr)) {
3479                 pool->dma_addr = 0;
3480                 ret = -ENOMEM;
3481                 goto failure;
3482         }
3483
3484         writel(virt_to_phys(base->lcla_pool.base),
3485                base->virtbase + D40_DREG_LCLA);
3486 failure:
3487         kfree(page_list);
3488         return ret;
3489 }
3490
3491 static int __init d40_of_probe(struct platform_device *pdev,
3492                                struct device_node *np)
3493 {
3494         struct stedma40_platform_data *pdata;
3495         int num_phy = 0, num_memcpy = 0, num_disabled = 0;
3496         const __be32 *list;
3497
3498         pdata = devm_kzalloc(&pdev->dev,
3499                              sizeof(struct stedma40_platform_data),
3500                              GFP_KERNEL);
3501         if (!pdata)
3502                 return -ENOMEM;
3503
3504         /* If absent this value will be obtained from h/w. */
3505         of_property_read_u32(np, "dma-channels", &num_phy);
3506         if (num_phy > 0)
3507                 pdata->num_of_phy_chans = num_phy;
3508
3509         list = of_get_property(np, "memcpy-channels", &num_memcpy);
3510         num_memcpy /= sizeof(*list);
3511
3512         if (num_memcpy > D40_MEMCPY_MAX_CHANS || num_memcpy <= 0) {
3513                 d40_err(&pdev->dev,
3514                         "Invalid number of memcpy channels specified (%d)\n",
3515                         num_memcpy);
3516                 return -EINVAL;
3517         }
3518         pdata->num_of_memcpy_chans = num_memcpy;
3519
3520         of_property_read_u32_array(np, "memcpy-channels",
3521                                    dma40_memcpy_channels,
3522                                    num_memcpy);
3523
3524         list = of_get_property(np, "disabled-channels", &num_disabled);
3525         num_disabled /= sizeof(*list);
3526
3527         if (num_disabled >= STEDMA40_MAX_PHYS || num_disabled < 0) {
3528                 d40_err(&pdev->dev,
3529                         "Invalid number of disabled channels specified (%d)\n",
3530                         num_disabled);
3531                 return -EINVAL;
3532         }
3533
3534         of_property_read_u32_array(np, "disabled-channels",
3535                                    pdata->disabled_channels,
3536                                    num_disabled);
3537         pdata->disabled_channels[num_disabled] = -1;
3538
3539         pdev->dev.platform_data = pdata;
3540
3541         return 0;
3542 }
3543
3544 static int __init d40_probe(struct platform_device *pdev)
3545 {
3546         struct stedma40_platform_data *plat_data = dev_get_platdata(&pdev->dev);
3547         struct device_node *np = pdev->dev.of_node;
3548         int ret = -ENOENT;
3549         struct d40_base *base = NULL;
3550         struct resource *res = NULL;
3551         int num_reserved_chans;
3552         u32 val;
3553
3554         if (!plat_data) {
3555                 if (np) {
3556                         if(d40_of_probe(pdev, np)) {
3557                                 ret = -ENOMEM;
3558                                 goto failure;
3559                         }
3560                 } else {
3561                         d40_err(&pdev->dev, "No pdata or Device Tree provided\n");
3562                         goto failure;
3563                 }
3564         }
3565
3566         base = d40_hw_detect_init(pdev);
3567         if (!base)
3568                 goto failure;
3569
3570         num_reserved_chans = d40_phy_res_init(base);
3571
3572         platform_set_drvdata(pdev, base);
3573
3574         spin_lock_init(&base->interrupt_lock);
3575         spin_lock_init(&base->execmd_lock);
3576
3577         /* Get IO for logical channel parameter address */
3578         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "lcpa");
3579         if (!res) {
3580                 ret = -ENOENT;
3581                 d40_err(&pdev->dev, "No \"lcpa\" memory resource\n");
3582                 goto failure;
3583         }
3584         base->lcpa_size = resource_size(res);
3585         base->phy_lcpa = res->start;
3586
3587         if (request_mem_region(res->start, resource_size(res),
3588                                D40_NAME " I/O lcpa") == NULL) {
3589                 ret = -EBUSY;
3590                 d40_err(&pdev->dev, "Failed to request LCPA region %pR\n", res);
3591                 goto failure;
3592         }
3593
3594         /* We make use of ESRAM memory for this. */
3595         val = readl(base->virtbase + D40_DREG_LCPA);
3596         if (res->start != val && val != 0) {
3597                 dev_warn(&pdev->dev,
3598                          "[%s] Mismatch LCPA dma 0x%x, def %pa\n",
3599                          __func__, val, &res->start);
3600         } else
3601                 writel(res->start, base->virtbase + D40_DREG_LCPA);
3602
3603         base->lcpa_base = ioremap(res->start, resource_size(res));
3604         if (!base->lcpa_base) {
3605                 ret = -ENOMEM;
3606                 d40_err(&pdev->dev, "Failed to ioremap LCPA region\n");
3607                 goto failure;
3608         }
3609         /* If lcla has to be located in ESRAM we don't need to allocate */
3610         if (base->plat_data->use_esram_lcla) {
3611                 res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
3612                                                         "lcla_esram");
3613                 if (!res) {
3614                         ret = -ENOENT;
3615                         d40_err(&pdev->dev,
3616                                 "No \"lcla_esram\" memory resource\n");
3617                         goto failure;
3618                 }
3619                 base->lcla_pool.base = ioremap(res->start,
3620                                                 resource_size(res));
3621                 if (!base->lcla_pool.base) {
3622                         ret = -ENOMEM;
3623                         d40_err(&pdev->dev, "Failed to ioremap LCLA region\n");
3624                         goto failure;
3625                 }
3626                 writel(res->start, base->virtbase + D40_DREG_LCLA);
3627
3628         } else {
3629                 ret = d40_lcla_allocate(base);
3630                 if (ret) {
3631                         d40_err(&pdev->dev, "Failed to allocate LCLA area\n");
3632                         goto failure;
3633                 }
3634         }
3635
3636         spin_lock_init(&base->lcla_pool.lock);
3637
3638         base->irq = platform_get_irq(pdev, 0);
3639
3640         ret = request_irq(base->irq, d40_handle_interrupt, 0, D40_NAME, base);
3641         if (ret) {
3642                 d40_err(&pdev->dev, "No IRQ defined\n");
3643                 goto failure;
3644         }
3645
3646         pm_runtime_irq_safe(base->dev);
3647         pm_runtime_set_autosuspend_delay(base->dev, DMA40_AUTOSUSPEND_DELAY);
3648         pm_runtime_use_autosuspend(base->dev);
3649         pm_runtime_enable(base->dev);
3650         pm_runtime_resume(base->dev);
3651
3652         if (base->plat_data->use_esram_lcla) {
3653
3654                 base->lcpa_regulator = regulator_get(base->dev, "lcla_esram");
3655                 if (IS_ERR(base->lcpa_regulator)) {
3656                         d40_err(&pdev->dev, "Failed to get lcpa_regulator\n");
3657                         ret = PTR_ERR(base->lcpa_regulator);
3658                         base->lcpa_regulator = NULL;
3659                         goto failure;
3660                 }
3661
3662                 ret = regulator_enable(base->lcpa_regulator);
3663                 if (ret) {
3664                         d40_err(&pdev->dev,
3665                                 "Failed to enable lcpa_regulator\n");
3666                         regulator_put(base->lcpa_regulator);
3667                         base->lcpa_regulator = NULL;
3668                         goto failure;
3669                 }
3670         }
3671
3672         base->initialized = true;
3673         ret = d40_dmaengine_init(base, num_reserved_chans);
3674         if (ret)
3675                 goto failure;
3676
3677         base->dev->dma_parms = &base->dma_parms;
3678         ret = dma_set_max_seg_size(base->dev, STEDMA40_MAX_SEG_SIZE);
3679         if (ret) {
3680                 d40_err(&pdev->dev, "Failed to set dma max seg size\n");
3681                 goto failure;
3682         }
3683
3684         d40_hw_init(base);
3685
3686         if (np) {
3687                 ret = of_dma_controller_register(np, d40_xlate, NULL);
3688                 if (ret)
3689                         dev_err(&pdev->dev,
3690                                 "could not register of_dma_controller\n");
3691         }
3692
3693         dev_info(base->dev, "initialized\n");
3694         return 0;
3695
3696 failure:
3697         if (base) {
3698                 if (base->desc_slab)
3699                         kmem_cache_destroy(base->desc_slab);
3700                 if (base->virtbase)
3701                         iounmap(base->virtbase);
3702
3703                 if (base->lcla_pool.base && base->plat_data->use_esram_lcla) {
3704                         iounmap(base->lcla_pool.base);
3705                         base->lcla_pool.base = NULL;
3706                 }
3707
3708                 if (base->lcla_pool.dma_addr)
3709                         dma_unmap_single(base->dev, base->lcla_pool.dma_addr,
3710                                          SZ_1K * base->num_phy_chans,
3711                                          DMA_TO_DEVICE);
3712
3713                 if (!base->lcla_pool.base_unaligned && base->lcla_pool.base)
3714                         free_pages((unsigned long)base->lcla_pool.base,
3715                                    base->lcla_pool.pages);
3716
3717                 kfree(base->lcla_pool.base_unaligned);
3718
3719                 if (base->phy_lcpa)
3720                         release_mem_region(base->phy_lcpa,
3721                                            base->lcpa_size);
3722                 if (base->phy_start)
3723                         release_mem_region(base->phy_start,
3724                                            base->phy_size);
3725                 if (base->clk) {
3726                         clk_disable_unprepare(base->clk);
3727                         clk_put(base->clk);
3728                 }
3729
3730                 if (base->lcpa_regulator) {
3731                         regulator_disable(base->lcpa_regulator);
3732                         regulator_put(base->lcpa_regulator);
3733                 }
3734
3735                 kfree(base->lcla_pool.alloc_map);
3736                 kfree(base->lookup_log_chans);
3737                 kfree(base->lookup_phy_chans);
3738                 kfree(base->phy_res);
3739                 kfree(base);
3740         }
3741
3742         d40_err(&pdev->dev, "probe failed\n");
3743         return ret;
3744 }
3745
3746 static const struct of_device_id d40_match[] = {
3747         { .compatible = "stericsson,dma40", },
3748         {}
3749 };
3750
3751 static struct platform_driver d40_driver = {
3752         .driver = {
3753                 .owner = THIS_MODULE,
3754                 .name  = D40_NAME,
3755                 .pm = DMA40_PM_OPS,
3756                 .of_match_table = d40_match,
3757         },
3758 };
3759
3760 static int __init stedma40_init(void)
3761 {
3762         return platform_driver_probe(&d40_driver, d40_probe);
3763 }
3764 subsys_initcall(stedma40_init);