drivers/block/sx8.c

   1 /*
   2  *  sx8.c: Driver for Promise SATA SX8 looks-like-I2O hardware
   3  *
   4  *  Copyright 2004-2005 Red Hat, Inc.
   5  *
   6  *  Author/maintainer:  Jeff Garzik <jgarzik@pobox.com>
   7  *
   8  *  This file is subject to the terms and conditions of the GNU General Public
   9  *  License.  See the file "COPYING" in the main directory of this archive
  10  *  for more details.
  11  */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/init.h>
  16 #include <linux/pci.h>
  17 #include <linux/slab.h>
  18 #include <linux/spinlock.h>
  19 #include <linux/blkdev.h>
  20 #include <linux/sched.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/compiler.h>
  23 #include <linux/workqueue.h>
  24 #include <linux/bitops.h>
  25 #include <linux/delay.h>
  26 #include <linux/time.h>
  27 #include <linux/hdreg.h>
  28 #include <linux/dma-mapping.h>
  29 #include <linux/completion.h>
  30 #include <linux/scatterlist.h>
  31 #include <asm/io.h>
  32 #include <asm/uaccess.h>
  33
  34 #if 0
  35 #define CARM_DEBUG
  36 #define CARM_VERBOSE_DEBUG
  37 #else
  38 #undef CARM_DEBUG
  39 #undef CARM_VERBOSE_DEBUG
  40 #endif
  41 #undef CARM_NDEBUG
  42
  43 #define DRV_NAME "sx8"
  44 #define DRV_VERSION "1.0"
  45 #define PFX DRV_NAME ": "
  46
  47 MODULE_AUTHOR("Jeff Garzik");
  48 MODULE_LICENSE("GPL");
  49 MODULE_DESCRIPTION("Promise SATA SX8 block driver");
  50 MODULE_VERSION(DRV_VERSION);
  51
  52 /*
  53  * SX8 hardware has a single message queue for all ATA ports.
  54  * When this driver was written, the hardware (firmware?) would
  55  * corrupt data eventually, if more than one request was outstanding.
  56  * As one can imagine, having 8 ports bottlenecking on a single
  57  * command hurts performance.
  58  *
  59  * Based on user reports, later versions of the hardware (firmware?)
  60  * seem to be able to survive with more than one command queued.
  61  *
  62  * Therefore, we default to the safe option -- 1 command -- but
  63  * allow the user to increase this.
  64  *
  65  * SX8 should be able to support up to ~60 queued commands (CARM_MAX_REQ),
  66  * but problems seem to occur when you exceed ~30, even on newer hardware.
  67  */
  68 static int max_queue = 1;
  69 module_param(max_queue, int, 0444);
  70 MODULE_PARM_DESC(max_queue, "Maximum number of queued commands. (min==1, max==30, safe==1)");
  71
  72
  73 #define NEXT_RESP(idx)  ((idx + 1) % RMSG_Q_LEN)
  74
  75 /* 0xf is just arbitrary, non-zero noise; this is sorta like poisoning */
  76 #define TAG_ENCODE(tag) (((tag) << 16) | 0xf)
  77 #define TAG_DECODE(tag) (((tag) >> 16) & 0x1f)
  78 #define TAG_VALID(tag)  ((((tag) & 0xf) == 0xf) && (TAG_DECODE(tag) < 32))
  79
  80 /* note: prints function name for you */
  81 #ifdef CARM_DEBUG
  82 #define DPRINTK(fmt, args...) printk(KERN_ERR "%s: " fmt, __func__, ## args)
  83 #ifdef CARM_VERBOSE_DEBUG
  84 #define VPRINTK(fmt, args...) printk(KERN_ERR "%s: " fmt, __func__, ## args)
  85 #else
  86 #define VPRINTK(fmt, args...)
  87 #endif  /* CARM_VERBOSE_DEBUG */
  88 #else
  89 #define DPRINTK(fmt, args...)
  90 #define VPRINTK(fmt, args...)
  91 #endif  /* CARM_DEBUG */
  92
  93 #ifdef CARM_NDEBUG
  94 #define assert(expr)
  95 #else
  96 #define assert(expr) \
  97         if(unlikely(!(expr))) {                                   \
  98         printk(KERN_ERR "Assertion failed! %s,%s,%s,line=%d\n", \
  99         #expr, __FILE__, __func__, __LINE__);          \
 100         }
 101 #endif
 102
 103 /* defines only for the constants which don't work well as enums */
 104 struct carm_host;
 105
 106 enum {
 107         /* adapter-wide limits */
 108         CARM_MAX_PORTS          = 8,
 109         CARM_SHM_SIZE           = (4096 << 7),
 110         CARM_MINORS_PER_MAJOR   = 256 / CARM_MAX_PORTS,
 111         CARM_MAX_WAIT_Q         = CARM_MAX_PORTS + 1,
 112
 113         /* command message queue limits */
 114         CARM_MAX_REQ            = 64,          /* max command msgs per host */
 115         CARM_MSG_LOW_WATER      = (CARM_MAX_REQ / 4),        /* refill mark */
 116
 117         /* S/G limits, host-wide and per-request */
 118         CARM_MAX_REQ_SG         = 32,        /* max s/g entries per request */
 119         CARM_MAX_HOST_SG        = 600,          /* max s/g entries per host */
 120         CARM_SG_LOW_WATER       = (CARM_MAX_HOST_SG / 4),   /* re-fill mark */
 121
 122         /* hardware registers */
 123         CARM_IHQP               = 0x1c,
 124         CARM_INT_STAT           = 0x10, /* interrupt status */
 125         CARM_INT_MASK           = 0x14, /* interrupt mask */
 126         CARM_HMUC               = 0x18, /* host message unit control */
 127         RBUF_ADDR_LO            = 0x20, /* response msg DMA buf low 32 bits */
 128         RBUF_ADDR_HI            = 0x24, /* response msg DMA buf high 32 bits */
 129         RBUF_BYTE_SZ            = 0x28,
 130         CARM_RESP_IDX           = 0x2c,
 131         CARM_CMS0               = 0x30, /* command message size reg 0 */
 132         CARM_LMUC               = 0x48,
 133         CARM_HMPHA              = 0x6c,
 134         CARM_INITC              = 0xb5,
 135
 136         /* bits in CARM_INT_{STAT,MASK} */
 137         INT_RESERVED            = 0xfffffff0,
 138         INT_WATCHDOG            = (1 << 3),     /* watchdog timer */
 139         INT_Q_OVERFLOW          = (1 << 2),     /* cmd msg q overflow */
 140         INT_Q_AVAILABLE         = (1 << 1),     /* cmd msg q has free space */
 141         INT_RESPONSE            = (1 << 0),     /* response msg available */
 142         INT_ACK_MASK            = INT_WATCHDOG | INT_Q_OVERFLOW,
 143         INT_DEF_MASK            = INT_RESERVED | INT_Q_OVERFLOW |
 144                                   INT_RESPONSE,
 145
 146         /* command messages, and related register bits */
 147         CARM_HAVE_RESP          = 0x01,
 148         CARM_MSG_READ           = 1,
 149         CARM_MSG_WRITE          = 2,
 150         CARM_MSG_VERIFY         = 3,
 151         CARM_MSG_GET_CAPACITY   = 4,
 152         CARM_MSG_FLUSH          = 5,
 153         CARM_MSG_IOCTL          = 6,
 154         CARM_MSG_ARRAY          = 8,
 155         CARM_MSG_MISC           = 9,
 156         CARM_CME                = (1 << 2),
 157         CARM_RME                = (1 << 1),
 158         CARM_WZBC               = (1 << 0),
 159         CARM_RMI                = (1 << 0),
 160         CARM_Q_FULL             = (1 << 3),
 161         CARM_MSG_SIZE           = 288,
 162         CARM_Q_LEN              = 48,
 163
 164         /* CARM_MSG_IOCTL messages */
 165         CARM_IOC_SCAN_CHAN      = 5,    /* scan channels for devices */
 166         CARM_IOC_GET_TCQ        = 13,   /* get tcq/ncq depth */
 167         CARM_IOC_SET_TCQ        = 14,   /* set tcq/ncq depth */
 168
 169         IOC_SCAN_CHAN_NODEV     = 0x1f,
 170         IOC_SCAN_CHAN_OFFSET    = 0x40,
 171
 172         /* CARM_MSG_ARRAY messages */
 173         CARM_ARRAY_INFO         = 0,
 174
 175         ARRAY_NO_EXIST          = (1 << 31),
 176
 177         /* response messages */
 178         RMSG_SZ                 = 8,    /* sizeof(struct carm_response) */
 179         RMSG_Q_LEN              = 48,   /* resp. msg list length */
 180         RMSG_OK                 = 1,    /* bit indicating msg was successful */
 181                                         /* length of entire resp. msg buffer */
 182         RBUF_LEN                = RMSG_SZ * RMSG_Q_LEN,
 183
 184         PDC_SHM_SIZE            = (4096 << 7), /* length of entire h/w buffer */
 185
 186         /* CARM_MSG_MISC messages */
 187         MISC_GET_FW_VER         = 2,
 188         MISC_ALLOC_MEM          = 3,
 189         MISC_SET_TIME           = 5,
 190
 191         /* MISC_GET_FW_VER feature bits */
 192         FW_VER_4PORT            = (1 << 2), /* 1=4 ports, 0=8 ports */
 193         FW_VER_NON_RAID         = (1 << 1), /* 1=non-RAID firmware, 0=RAID */
 194         FW_VER_ZCR              = (1 << 0), /* zero channel RAID (whatever that is) */
 195
 196         /* carm_host flags */
 197         FL_NON_RAID             = FW_VER_NON_RAID,
 198         FL_4PORT                = FW_VER_4PORT,
 199         FL_FW_VER_MASK          = (FW_VER_NON_RAID | FW_VER_4PORT),
 200         FL_DAC                  = (1 << 16),
 201         FL_DYN_MAJOR            = (1 << 17),
 202 };
 203
 204 enum {
 205         CARM_SG_BOUNDARY        = 0xffffUL,         /* s/g segment boundary */
 206 };
 207
 208 enum scatter_gather_types {
 209         SGT_32BIT               = 0,
 210         SGT_64BIT               = 1,
 211 };
 212
 213 enum host_states {
 214         HST_INVALID,            /* invalid state; never used */
 215         HST_ALLOC_BUF,          /* setting up master SHM area */
 216         HST_ERROR,              /* we never leave here */
 217         HST_PORT_SCAN,          /* start dev scan */
 218         HST_DEV_SCAN_START,     /* start per-device probe */
 219         HST_DEV_SCAN,           /* continue per-device probe */
 220         HST_DEV_ACTIVATE,       /* activate devices we found */
 221         HST_PROBE_FINISHED,     /* probe is complete */
 222         HST_PROBE_START,        /* initiate probe */
 223         HST_SYNC_TIME,          /* tell firmware what time it is */
 224         HST_GET_FW_VER,         /* get firmware version, adapter port cnt */
 225 };
 226
 227 #ifdef CARM_DEBUG
 228 static const char *state_name[] = {
 229         "HST_INVALID",
 230         "HST_ALLOC_BUF",
 231         "HST_ERROR",
 232         "HST_PORT_SCAN",
 233         "HST_DEV_SCAN_START",
 234         "HST_DEV_SCAN",
 235         "HST_DEV_ACTIVATE",
 236         "HST_PROBE_FINISHED",
 237         "HST_PROBE_START",
 238         "HST_SYNC_TIME",
 239         "HST_GET_FW_VER",
 240 };
 241 #endif
 242
 243 struct carm_port {
 244         unsigned int                    port_no;
 245         struct gendisk                  *disk;
 246         struct carm_host                *host;
 247
 248         /* attached device characteristics */
 249         u64                             capacity;
 250         char                            name[41];
 251         u16                             dev_geom_head;
 252         u16                             dev_geom_sect;
 253         u16                             dev_geom_cyl;
 254 };
 255
 256 struct carm_request {
 257         unsigned int                    tag;
 258         int                             n_elem;
 259         unsigned int                    msg_type;
 260         unsigned int                    msg_subtype;
 261         unsigned int                    msg_bucket;
 262         struct request                  *rq;
 263         struct carm_port                *port;
 264         struct scatterlist              sg[CARM_MAX_REQ_SG];
 265 };
 266
 267 struct carm_host {
 268         unsigned long                   flags;
 269         void                            __iomem *mmio;
 270         void                            *shm;
 271         dma_addr_t                      shm_dma;
 272
 273         int                             major;
 274         int                             id;
 275         char                            name[32];
 276
 277         spinlock_t                      lock;
 278         struct pci_dev                  *pdev;
 279         unsigned int                    state;
 280         u32                             fw_ver;
 281
 282         struct request_queue            *oob_q;
 283         unsigned int                    n_oob;
 284
 285         unsigned int                    hw_sg_used;
 286
 287         unsigned int                    resp_idx;
 288
 289         unsigned int                    wait_q_prod;
 290         unsigned int                    wait_q_cons;
 291         struct request_queue            *wait_q[CARM_MAX_WAIT_Q];
 292
 293         unsigned int                    n_msgs;
 294         u64                             msg_alloc;
 295         struct carm_request             req[CARM_MAX_REQ];
 296         void                            *msg_base;
 297         dma_addr_t                      msg_dma;
 298
 299         int                             cur_scan_dev;
 300         unsigned long                   dev_active;
 301         unsigned long                   dev_present;
 302         struct carm_port                port[CARM_MAX_PORTS];
 303
 304         struct work_struct              fsm_task;
 305
 306         struct completion               probe_comp;
 307 };
 308
 309 struct carm_response {
 310         __le32 ret_handle;
 311         __le32 status;
 312 }  __attribute__((packed));
 313
 314 struct carm_msg_sg {
 315         __le32 start;
 316         __le32 len;
 317 }  __attribute__((packed));
 318
 319 struct carm_msg_rw {
 320         u8 type;
 321         u8 id;
 322         u8 sg_count;
 323         u8 sg_type;
 324         __le32 handle;
 325         __le32 lba;
 326         __le16 lba_count;
 327         __le16 lba_high;
 328         struct carm_msg_sg sg[32];
 329 }  __attribute__((packed));
 330
 331 struct carm_msg_allocbuf {
 332         u8 type;
 333         u8 subtype;
 334         u8 n_sg;
 335         u8 sg_type;
 336         __le32 handle;
 337         __le32 addr;
 338         __le32 len;
 339         __le32 evt_pool;
 340         __le32 n_evt;
 341         __le32 rbuf_pool;
 342         __le32 n_rbuf;
 343         __le32 msg_pool;
 344         __le32 n_msg;
 345         struct carm_msg_sg sg[8];
 346 }  __attribute__((packed));
 347
 348 struct carm_msg_ioctl {
 349         u8 type;
 350         u8 subtype;
 351         u8 array_id;
 352         u8 reserved1;
 353         __le32 handle;
 354         __le32 data_addr;
 355         u32 reserved2;
 356 }  __attribute__((packed));
 357
 358 struct carm_msg_sync_time {
 359         u8 type;
 360         u8 subtype;
 361         u16 reserved1;
 362         __le32 handle;
 363         u32 reserved2;
 364         __le32 timestamp;
 365 }  __attribute__((packed));
 366
 367 struct carm_msg_get_fw_ver {
 368         u8 type;
 369         u8 subtype;
 370         u16 reserved1;
 371         __le32 handle;
 372         __le32 data_addr;
 373         u32 reserved2;
 374 }  __attribute__((packed));
 375
 376 struct carm_fw_ver {
 377         __le32 version;
 378         u8 features;
 379         u8 reserved1;
 380         u16 reserved2;
 381 }  __attribute__((packed));
 382
 383 struct carm_array_info {
 384         __le32 size;
 385
 386         __le16 size_hi;
 387         __le16 stripe_size;
 388
 389         __le32 mode;
 390
 391         __le16 stripe_blk_sz;
 392         __le16 reserved1;
 393
 394         __le16 cyl;
 395         __le16 head;
 396
 397         __le16 sect;
 398         u8 array_id;
 399         u8 reserved2;
 400
 401         char name[40];
 402
 403         __le32 array_status;
 404
 405         /* device list continues beyond this point? */
 406 }  __attribute__((packed));
 407
 408 static int carm_init_one (struct pci_dev *pdev, const struct pci_device_id *ent);
 409 static void carm_remove_one (struct pci_dev *pdev);
 410 static int carm_bdev_getgeo(struct block_device *bdev, struct hd_geometry *geo);
 411
 412 static const struct pci_device_id carm_pci_tbl[] = {
 413         { PCI_VENDOR_ID_PROMISE, 0x8000, PCI_ANY_ID, PCI_ANY_ID, 0, 0, },
 414         { PCI_VENDOR_ID_PROMISE, 0x8002, PCI_ANY_ID, PCI_ANY_ID, 0, 0, },
 415         { }     /* terminate list */
 416 };
 417 MODULE_DEVICE_TABLE(pci, carm_pci_tbl);
 418
 419 static struct pci_driver carm_driver = {
 420         .name           = DRV_NAME,
 421         .id_table       = carm_pci_tbl,
 422         .probe          = carm_init_one,
 423         .remove         = carm_remove_one,
 424 };
 425
 426 static const struct block_device_operations carm_bd_ops = {
 427         .owner          = THIS_MODULE,
 428         .getgeo         = carm_bdev_getgeo,
 429 };
 430
 431 static unsigned int carm_host_id;
 432 static unsigned long carm_major_alloc;
 433
 434
 435
 436 static int carm_bdev_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 437 {
 438         struct carm_port *port = bdev->bd_disk->private_data;
 439
 440         geo->heads = (u8) port->dev_geom_head;
 441         geo->sectors = (u8) port->dev_geom_sect;
 442         geo->cylinders = port->dev_geom_cyl;
 443         return 0;
 444 }
 445
 446 static const u32 msg_sizes[] = { 32, 64, 128, CARM_MSG_SIZE };
 447
 448 static inline int carm_lookup_bucket(u32 msg_size)
 449 {
 450         int i;
 451
 452         for (i = 0; i < ARRAY_SIZE(msg_sizes); i++)
 453                 if (msg_size <= msg_sizes[i])
 454                         return i;
 455
 456         return -ENOENT;
 457 }
 458
 459 static void carm_init_buckets(void __iomem *mmio)
 460 {
 461         unsigned int i;
 462
 463         for (i = 0; i < ARRAY_SIZE(msg_sizes); i++)
 464                 writel(msg_sizes[i], mmio + CARM_CMS0 + (4 * i));
 465 }
 466
 467 static inline void *carm_ref_msg(struct carm_host *host,
 468                                  unsigned int msg_idx)
 469 {
 470         return host->msg_base + (msg_idx * CARM_MSG_SIZE);
 471 }
 472
 473 static inline dma_addr_t carm_ref_msg_dma(struct carm_host *host,
 474                                           unsigned int msg_idx)
 475 {
 476         return host->msg_dma + (msg_idx * CARM_MSG_SIZE);
 477 }
 478
 479 static int carm_send_msg(struct carm_host *host,
 480                          struct carm_request *crq)
 481 {
 482         void __iomem *mmio = host->mmio;
 483         u32 msg = (u32) carm_ref_msg_dma(host, crq->tag);
 484         u32 cm_bucket = crq->msg_bucket;
 485         u32 tmp;
 486         int rc = 0;
 487
 488         VPRINTK("ENTER\n");
 489
 490         tmp = readl(mmio + CARM_HMUC);
 491         if (tmp & CARM_Q_FULL) {
 492 #if 0
 493                 tmp = readl(mmio + CARM_INT_MASK);
 494                 tmp |= INT_Q_AVAILABLE;
 495                 writel(tmp, mmio + CARM_INT_MASK);
 496                 readl(mmio + CARM_INT_MASK);    /* flush */
 497 #endif
 498                 DPRINTK("host msg queue full\n");
 499                 rc = -EBUSY;
 500         } else {
 501                 writel(msg | (cm_bucket << 1), mmio + CARM_IHQP);
 502                 readl(mmio + CARM_IHQP);        /* flush */
 503         }
 504
 505         return rc;
 506 }
 507
 508 static struct carm_request *carm_get_request(struct carm_host *host)
 509 {
 510         unsigned int i;
 511
 512         /* obey global hardware limit on S/G entries */
 513         if (host->hw_sg_used >= (CARM_MAX_HOST_SG - CARM_MAX_REQ_SG))
 514                 return NULL;
 515
 516         for (i = 0; i < max_queue; i++)
 517                 if ((host->msg_alloc & (1ULL << i)) == 0) {
 518                         struct carm_request *crq = &host->req[i];
 519                         crq->port = NULL;
 520                         crq->n_elem = 0;
 521
 522                         host->msg_alloc |= (1ULL << i);
 523                         host->n_msgs++;
 524
 525                         assert(host->n_msgs <= CARM_MAX_REQ);
 526                         sg_init_table(crq->sg, CARM_MAX_REQ_SG);
 527                         return crq;
 528                 }
 529
 530         DPRINTK("no request available, returning NULL\n");
 531         return NULL;
 532 }
 533
 534 static int carm_put_request(struct carm_host *host, struct carm_request *crq)
 535 {
 536         assert(crq->tag < max_queue);
 537
 538         if (unlikely((host->msg_alloc & (1ULL << crq->tag)) == 0))
 539                 return -EINVAL; /* tried to clear a tag that was not active */
 540
 541         assert(host->hw_sg_used >= crq->n_elem);
 542
 543         host->msg_alloc &= ~(1ULL << crq->tag);
 544         host->hw_sg_used -= crq->n_elem;
 545         host->n_msgs--;
 546
 547         return 0;
 548 }
 549
 550 static struct carm_request *carm_get_special(struct carm_host *host)
 551 {
 552         unsigned long flags;
 553         struct carm_request *crq = NULL;
 554         struct request *rq;
 555         int tries = 5000;
 556
 557         while (tries-- > 0) {
 558                 spin_lock_irqsave(&host->lock, flags);
 559                 crq = carm_get_request(host);
 560                 spin_unlock_irqrestore(&host->lock, flags);
 561
 562                 if (crq)
 563                         break;
 564                 msleep(10);
 565         }
 566
 567         if (!crq)
 568                 return NULL;
 569
 570         rq = blk_get_request(host->oob_q, WRITE /* bogus */, GFP_KERNEL);
 571         if (!rq) {
 572                 spin_lock_irqsave(&host->lock, flags);
 573                 carm_put_request(host, crq);
 574                 spin_unlock_irqrestore(&host->lock, flags);
 575                 return NULL;
 576         }
 577
 578         crq->rq = rq;
 579         return crq;
 580 }
 581
 582 static int carm_array_info (struct carm_host *host, unsigned int array_idx)
 583 {
 584         struct carm_msg_ioctl *ioc;
 585         unsigned int idx;
 586         u32 msg_data;
 587         dma_addr_t msg_dma;
 588         struct carm_request *crq;
 589         int rc;
 590
 591         crq = carm_get_special(host);
 592         if (!crq) {
 593                 rc = -ENOMEM;
 594                 goto err_out;
 595         }
 596
 597         idx = crq->tag;
 598
 599         ioc = carm_ref_msg(host, idx);
 600         msg_dma = carm_ref_msg_dma(host, idx);
 601         msg_data = (u32) (msg_dma + sizeof(struct carm_array_info));
 602
 603         crq->msg_type = CARM_MSG_ARRAY;
 604         crq->msg_subtype = CARM_ARRAY_INFO;
 605         rc = carm_lookup_bucket(sizeof(struct carm_msg_ioctl) +
 606                                 sizeof(struct carm_array_info));
 607         BUG_ON(rc < 0);
 608         crq->msg_bucket = (u32) rc;
 609
 610         memset(ioc, 0, sizeof(*ioc));
 611         ioc->type       = CARM_MSG_ARRAY;
 612         ioc->subtype    = CARM_ARRAY_INFO;
 613         ioc->array_id   = (u8) array_idx;
 614         ioc->handle     = cpu_to_le32(TAG_ENCODE(idx));
 615         ioc->data_addr  = cpu_to_le32(msg_data);
 616
 617         spin_lock_irq(&host->lock);
 618         assert(host->state == HST_DEV_SCAN_START ||
 619                host->state == HST_DEV_SCAN);
 620         spin_unlock_irq(&host->lock);
 621
 622         DPRINTK("blk_execute_rq_nowait, tag == %u\n", idx);
 623         crq->rq->cmd_type = REQ_TYPE_SPECIAL;
 624         crq->rq->special = crq;
 625         blk_execute_rq_nowait(host->oob_q, NULL, crq->rq, true, NULL);
 626
 627         return 0;
 628
 629 err_out:
 630         spin_lock_irq(&host->lock);
 631         host->state = HST_ERROR;
 632         spin_unlock_irq(&host->lock);
 633         return rc;
 634 }
 635
 636 typedef unsigned int (*carm_sspc_t)(struct carm_host *, unsigned int, void *);
 637
 638 static int carm_send_special (struct carm_host *host, carm_sspc_t func)
 639 {
 640         struct carm_request *crq;
 641         struct carm_msg_ioctl *ioc;
 642         void *mem;
 643         unsigned int idx, msg_size;
 644         int rc;
 645
 646         crq = carm_get_special(host);
 647         if (!crq)
 648                 return -ENOMEM;
 649
 650         idx = crq->tag;
 651
 652         mem = carm_ref_msg(host, idx);
 653
 654         msg_size = func(host, idx, mem);
 655
 656         ioc = mem;
 657         crq->msg_type = ioc->type;
 658         crq->msg_subtype = ioc->subtype;
 659         rc = carm_lookup_bucket(msg_size);
 660         BUG_ON(rc < 0);
 661         crq->msg_bucket = (u32) rc;
 662
 663         DPRINTK("blk_execute_rq_nowait, tag == %u\n", idx);
 664         crq->rq->cmd_type = REQ_TYPE_SPECIAL;
 665         crq->rq->special = crq;
 666         blk_execute_rq_nowait(host->oob_q, NULL, crq->rq, true, NULL);
 667
 668         return 0;
 669 }
 670
 671 static unsigned int carm_fill_sync_time(struct carm_host *host,
 672                                         unsigned int idx, void *mem)
 673 {
 674         struct timeval tv;
 675         struct carm_msg_sync_time *st = mem;
 676
 677         do_gettimeofday(&tv);
 678
 679         memset(st, 0, sizeof(*st));
 680         st->type        = CARM_MSG_MISC;
 681         st->subtype     = MISC_SET_TIME;
 682         st->handle      = cpu_to_le32(TAG_ENCODE(idx));
 683         st->timestamp   = cpu_to_le32(tv.tv_sec);
 684
 685         return sizeof(struct carm_msg_sync_time);
 686 }
 687
 688 static unsigned int carm_fill_alloc_buf(struct carm_host *host,
 689                                         unsigned int idx, void *mem)
 690 {
 691         struct carm_msg_allocbuf *ab = mem;
 692
 693         memset(ab, 0, sizeof(*ab));
 694         ab->type        = CARM_MSG_MISC;
 695         ab->subtype     = MISC_ALLOC_MEM;
 696         ab->handle      = cpu_to_le32(TAG_ENCODE(idx));
 697         ab->n_sg        = 1;
 698         ab->sg_type     = SGT_32BIT;
 699         ab->addr        = cpu_to_le32(host->shm_dma + (PDC_SHM_SIZE >> 1));
 700         ab->len         = cpu_to_le32(PDC_SHM_SIZE >> 1);
 701         ab->evt_pool    = cpu_to_le32(host->shm_dma + (16 * 1024));
 702         ab->n_evt       = cpu_to_le32(1024);
 703         ab->rbuf_pool   = cpu_to_le32(host->shm_dma);
 704         ab->n_rbuf      = cpu_to_le32(RMSG_Q_LEN);
 705         ab->msg_pool    = cpu_to_le32(host->shm_dma + RBUF_LEN);
 706         ab->n_msg       = cpu_to_le32(CARM_Q_LEN);
 707         ab->sg[0].start = cpu_to_le32(host->shm_dma + (PDC_SHM_SIZE >> 1));
 708         ab->sg[0].len   = cpu_to_le32(65536);
 709
 710         return sizeof(struct carm_msg_allocbuf);
 711 }
 712
 713 static unsigned int carm_fill_scan_channels(struct carm_host *host,
 714                                             unsigned int idx, void *mem)
 715 {
 716         struct carm_msg_ioctl *ioc = mem;
 717         u32 msg_data = (u32) (carm_ref_msg_dma(host, idx) +
 718                               IOC_SCAN_CHAN_OFFSET);
 719
 720         memset(ioc, 0, sizeof(*ioc));
 721         ioc->type       = CARM_MSG_IOCTL;
 722         ioc->subtype    = CARM_IOC_SCAN_CHAN;
 723         ioc->handle     = cpu_to_le32(TAG_ENCODE(idx));
 724         ioc->data_addr  = cpu_to_le32(msg_data);
 725
 726         /* fill output data area with "no device" default values */
 727         mem += IOC_SCAN_CHAN_OFFSET;
 728         memset(mem, IOC_SCAN_CHAN_NODEV, CARM_MAX_PORTS);
 729
 730         return IOC_SCAN_CHAN_OFFSET + CARM_MAX_PORTS;
 731 }
 732
 733 static unsigned int carm_fill_get_fw_ver(struct carm_host *host,
 734                                          unsigned int idx, void *mem)
 735 {
 736         struct carm_msg_get_fw_ver *ioc = mem;
 737         u32 msg_data = (u32) (carm_ref_msg_dma(host, idx) + sizeof(*ioc));
 738
 739         memset(ioc, 0, sizeof(*ioc));
 740         ioc->type       = CARM_MSG_MISC;
 741         ioc->subtype    = MISC_GET_FW_VER;
 742         ioc->handle     = cpu_to_le32(TAG_ENCODE(idx));
 743         ioc->data_addr  = cpu_to_le32(msg_data);
 744
 745         return sizeof(struct carm_msg_get_fw_ver) +
 746                sizeof(struct carm_fw_ver);
 747 }
 748
 749 static inline void carm_end_request_queued(struct carm_host *host,
 750                                            struct carm_request *crq,
 751                                            int error)
 752 {
 753         struct request *req = crq->rq;
 754         int rc;
 755
 756         __blk_end_request_all(req, error);
 757
 758         rc = carm_put_request(host, crq);
 759         assert(rc == 0);
 760 }
 761
 762 static inline void carm_push_q (struct carm_host *host, struct request_queue *q)
 763 {
 764         unsigned int idx = host->wait_q_prod % CARM_MAX_WAIT_Q;
 765
 766         blk_stop_queue(q);
 767         VPRINTK("STOPPED QUEUE %p\n", q);
 768
 769         host->wait_q[idx] = q;
 770         host->wait_q_prod++;
 771         BUG_ON(host->wait_q_prod == host->wait_q_cons); /* overrun */
 772 }
 773
 774 static inline struct request_queue *carm_pop_q(struct carm_host *host)
 775 {
 776         unsigned int idx;
 777
 778         if (host->wait_q_prod == host->wait_q_cons)
 779                 return NULL;
 780
 781         idx = host->wait_q_cons % CARM_MAX_WAIT_Q;
 782         host->wait_q_cons++;
 783
 784         return host->wait_q[idx];
 785 }
 786
 787 static inline void carm_round_robin(struct carm_host *host)
 788 {
 789         struct request_queue *q = carm_pop_q(host);
 790         if (q) {
 791                 blk_start_queue(q);
 792                 VPRINTK("STARTED QUEUE %p\n", q);
 793         }
 794 }
 795
 796 static inline void carm_end_rq(struct carm_host *host, struct carm_request *crq,
 797                                int error)
 798 {
 799         carm_end_request_queued(host, crq, error);
 800         if (max_queue == 1)
 801                 carm_round_robin(host);
 802         else if ((host->n_msgs <= CARM_MSG_LOW_WATER) &&
 803                  (host->hw_sg_used <= CARM_SG_LOW_WATER)) {
 804                 carm_round_robin(host);
 805         }
 806 }
 807
 808 static void carm_oob_rq_fn(struct request_queue *q)
 809 {
 810         struct carm_host *host = q->queuedata;
 811         struct carm_request *crq;
 812         struct request *rq;
 813         int rc;
 814
 815         while (1) {
 816                 DPRINTK("get req\n");
 817                 rq = blk_fetch_request(q);
 818                 if (!rq)
 819                         break;
 820
 821                 crq = rq->special;
 822                 assert(crq != NULL);
 823                 assert(crq->rq == rq);
 824
 825                 crq->n_elem = 0;
 826
 827                 DPRINTK("send req\n");
 828                 rc = carm_send_msg(host, crq);
 829                 if (rc) {
 830                         blk_requeue_request(q, rq);
 831                         carm_push_q(host, q);
 832                         return;         /* call us again later, eventually */
 833                 }
 834         }
 835 }
 836
 837 static void carm_rq_fn(struct request_queue *q)
 838 {
 839         struct carm_port *port = q->queuedata;
 840         struct carm_host *host = port->host;
 841         struct carm_msg_rw *msg;
 842         struct carm_request *crq;
 843         struct request *rq;
 844         struct scatterlist *sg;
 845         int writing = 0, pci_dir, i, n_elem, rc;
 846         u32 tmp;
 847         unsigned int msg_size;
 848
 849 queue_one_request:
 850         VPRINTK("get req\n");
 851         rq = blk_peek_request(q);
 852         if (!rq)
 853                 return;
 854
 855         crq = carm_get_request(host);
 856         if (!crq) {
 857                 carm_push_q(host, q);
 858                 return;         /* call us again later, eventually */
 859         }
 860         crq->rq = rq;
 861
 862         blk_start_request(rq);
 863
 864         if (rq_data_dir(rq) == WRITE) {
 865                 writing = 1;
 866                 pci_dir = PCI_DMA_TODEVICE;
 867         } else {
 868                 pci_dir = PCI_DMA_FROMDEVICE;
 869         }
 870
 871         /* get scatterlist from block layer */
 872         sg = &crq->sg[0];
 873         n_elem = blk_rq_map_sg(q, rq, sg);
 874         if (n_elem <= 0) {
 875                 carm_end_rq(host, crq, -EIO);
 876                 return;         /* request with no s/g entries? */
 877         }
 878
 879         /* map scatterlist to PCI bus addresses */
 880         n_elem = pci_map_sg(host->pdev, sg, n_elem, pci_dir);
 881         if (n_elem <= 0) {
 882                 carm_end_rq(host, crq, -EIO);
 883                 return;         /* request with no s/g entries? */
 884         }
 885         crq->n_elem = n_elem;
 886         crq->port = port;
 887         host->hw_sg_used += n_elem;
 888
 889         /*
 890          * build read/write message
 891          */
 892
 893         VPRINTK("build msg\n");
 894         msg = (struct carm_msg_rw *) carm_ref_msg(host, crq->tag);
 895
 896         if (writing) {
 897                 msg->type = CARM_MSG_WRITE;
 898                 crq->msg_type = CARM_MSG_WRITE;
 899         } else {
 900                 msg->type = CARM_MSG_READ;
 901                 crq->msg_type = CARM_MSG_READ;
 902         }
 903
 904         msg->id         = port->port_no;
 905         msg->sg_count   = n_elem;
 906         msg->sg_type    = SGT_32BIT;
 907         msg->handle     = cpu_to_le32(TAG_ENCODE(crq->tag));
 908         msg->lba        = cpu_to_le32(blk_rq_pos(rq) & 0xffffffff);
 909         tmp             = (blk_rq_pos(rq) >> 16) >> 16;
 910         msg->lba_high   = cpu_to_le16( (u16) tmp );
 911         msg->lba_count  = cpu_to_le16(blk_rq_sectors(rq));
 912
 913         msg_size = sizeof(struct carm_msg_rw) - sizeof(msg->sg);
 914         for (i = 0; i < n_elem; i++) {
 915                 struct carm_msg_sg *carm_sg = &msg->sg[i];
 916                 carm_sg->start = cpu_to_le32(sg_dma_address(&crq->sg[i]));
 917                 carm_sg->len = cpu_to_le32(sg_dma_len(&crq->sg[i]));
 918                 msg_size += sizeof(struct carm_msg_sg);
 919         }
 920
 921         rc = carm_lookup_bucket(msg_size);
 922         BUG_ON(rc < 0);
 923         crq->msg_bucket = (u32) rc;
 924
 925         /*
 926          * queue read/write message to hardware
 927          */
 928
 929         VPRINTK("send msg, tag == %u\n", crq->tag);
 930         rc = carm_send_msg(host, crq);
 931         if (rc) {
 932                 carm_put_request(host, crq);
 933                 blk_requeue_request(q, rq);
 934                 carm_push_q(host, q);
 935                 return;         /* call us again later, eventually */
 936         }
 937
 938         goto queue_one_request;
 939 }
 940
 941 static void carm_handle_array_info(struct carm_host *host,
 942                                    struct carm_request *crq, u8 *mem,
 943                                    int error)
 944 {
 945         struct carm_port *port;
 946         u8 *msg_data = mem + sizeof(struct carm_array_info);
 947         struct carm_array_info *desc = (struct carm_array_info *) msg_data;
 948         u64 lo, hi;
 949         int cur_port;
 950         size_t slen;
 951
 952         DPRINTK("ENTER\n");
 953
 954         carm_end_rq(host, crq, error);
 955
 956         if (error)
 957                 goto out;
 958         if (le32_to_cpu(desc->array_status) & ARRAY_NO_EXIST)
 959                 goto out;
 960
 961         cur_port = host->cur_scan_dev;
 962
 963         /* should never occur */
 964         if ((cur_port < 0) || (cur_port >= CARM_MAX_PORTS)) {
 965                 printk(KERN_ERR PFX "BUG: cur_scan_dev==%d, array_id==%d\n",
 966                        cur_port, (int) desc->array_id);
 967                 goto out;
 968         }
 969
 970         port = &host->port[cur_port];
 971
 972         lo = (u64) le32_to_cpu(desc->size);
 973         hi = (u64) le16_to_cpu(desc->size_hi);
 974
 975         port->capacity = lo | (hi << 32);
 976         port->dev_geom_head = le16_to_cpu(desc->head);
 977         port->dev_geom_sect = le16_to_cpu(desc->sect);
 978         port->dev_geom_cyl = le16_to_cpu(desc->cyl);
 979
 980         host->dev_active |= (1 << cur_port);
 981
 982         strncpy(port->name, desc->name, sizeof(port->name));
 983         port->name[sizeof(port->name) - 1] = 0;
 984         slen = strlen(port->name);
 985         while (slen && (port->name[slen - 1] == ' ')) {
 986                 port->name[slen - 1] = 0;
 987                 slen--;
 988         }
 989
 990         printk(KERN_INFO DRV_NAME "(%s): port %u device %Lu sectors\n",
 991                pci_name(host->pdev), port->port_no,
 992                (unsigned long long) port->capacity);
 993         printk(KERN_INFO DRV_NAME "(%s): port %u device \"%s\"\n",
 994                pci_name(host->pdev), port->port_no, port->name);
 995
 996 out:
 997         assert(host->state == HST_DEV_SCAN);
 998         schedule_work(&host->fsm_task);
 999 }
1000
1001 static void carm_handle_scan_chan(struct carm_host *host,
1002                                   struct carm_request *crq, u8 *mem,
1003                                   int error)
1004 {
1005         u8 *msg_data = mem + IOC_SCAN_CHAN_OFFSET;
1006         unsigned int i, dev_count = 0;
1007         int new_state = HST_DEV_SCAN_START;
1008
1009         DPRINTK("ENTER\n");
1010
1011         carm_end_rq(host, crq, error);
1012
1013         if (error) {
1014                 new_state = HST_ERROR;
1015                 goto out;
1016         }
1017
1018         /* TODO: scan and support non-disk devices */
1019         for (i = 0; i < 8; i++)
1020                 if (msg_data[i] == 0) { /* direct-access device (disk) */
1021                         host->dev_present |= (1 << i);
1022                         dev_count++;
1023                 }
1024
1025         printk(KERN_INFO DRV_NAME "(%s): found %u interesting devices\n",
1026                pci_name(host->pdev), dev_count);
1027
1028 out:
1029         assert(host->state == HST_PORT_SCAN);
1030         host->state = new_state;
1031         schedule_work(&host->fsm_task);
1032 }
1033
1034 static void carm_handle_generic(struct carm_host *host,
1035                                 struct carm_request *crq, int error,
1036                                 int cur_state, int next_state)
1037 {
1038         DPRINTK("ENTER\n");
1039
1040         carm_end_rq(host, crq, error);
1041
1042         assert(host->state == cur_state);
1043         if (error)
1044                 host->state = HST_ERROR;
1045         else
1046                 host->state = next_state;
1047         schedule_work(&host->fsm_task);
1048 }
1049
1050 static inline void carm_handle_rw(struct carm_host *host,
1051                                   struct carm_request *crq, int error)
1052 {
1053         int pci_dir;
1054
1055         VPRINTK("ENTER\n");
1056
1057         if (rq_data_dir(crq->rq) == WRITE)
1058                 pci_dir = PCI_DMA_TODEVICE;
1059         else
1060                 pci_dir = PCI_DMA_FROMDEVICE;
1061
1062         pci_unmap_sg(host->pdev, &crq->sg[0], crq->n_elem, pci_dir);
1063
1064         carm_end_rq(host, crq, error);
1065 }
1066
1067 static inline void carm_handle_resp(struct carm_host *host,
1068                                     __le32 ret_handle_le, u32 status)
1069 {
1070         u32 handle = le32_to_cpu(ret_handle_le);
1071         unsigned int msg_idx;
1072         struct carm_request *crq;
1073         int error = (status == RMSG_OK) ? 0 : -EIO;
1074         u8 *mem;
1075
1076         VPRINTK("ENTER, handle == 0x%x\n", handle);
1077
1078         if (unlikely(!TAG_VALID(handle))) {
1079                 printk(KERN_ERR DRV_NAME "(%s): BUG: invalid tag 0x%x\n",
1080                        pci_name(host->pdev), handle);
1081                 return;
1082         }
1083
1084         msg_idx = TAG_DECODE(handle);
1085         VPRINTK("tag == %u\n", msg_idx);
1086
1087         crq = &host->req[msg_idx];
1088
1089         /* fast path */
1090         if (likely(crq->msg_type == CARM_MSG_READ ||
1091                    crq->msg_type == CARM_MSG_WRITE)) {
1092                 carm_handle_rw(host, crq, error);
1093                 return;
1094         }
1095
1096         mem = carm_ref_msg(host, msg_idx);
1097
1098         switch (crq->msg_type) {
1099         case CARM_MSG_IOCTL: {
1100                 switch (crq->msg_subtype) {
1101                 case CARM_IOC_SCAN_CHAN:
1102                         carm_handle_scan_chan(host, crq, mem, error);
1103                         break;
1104                 default:
1105                         /* unknown / invalid response */
1106                         goto err_out;
1107                 }
1108                 break;
1109         }
1110
1111         case CARM_MSG_MISC: {
1112                 switch (crq->msg_subtype) {
1113                 case MISC_ALLOC_MEM:
1114                         carm_handle_generic(host, crq, error,
1115                                             HST_ALLOC_BUF, HST_SYNC_TIME);
1116                         break;
1117                 case MISC_SET_TIME:
1118                         carm_handle_generic(host, crq, error,
1119                                             HST_SYNC_TIME, HST_GET_FW_VER);
1120                         break;
1121                 case MISC_GET_FW_VER: {
1122                         struct carm_fw_ver *ver = (struct carm_fw_ver *)
1123                                 (mem + sizeof(struct carm_msg_get_fw_ver));
1124                         if (!error) {
1125                                 host->fw_ver = le32_to_cpu(ver->version);
1126                                 host->flags |= (ver->features & FL_FW_VER_MASK);
1127                         }
1128                         carm_handle_generic(host, crq, error,
1129                                             HST_GET_FW_VER, HST_PORT_SCAN);
1130                         break;
1131                 }
1132                 default:
1133                         /* unknown / invalid response */
1134                         goto err_out;
1135                 }
1136                 break;
1137         }
1138
1139         case CARM_MSG_ARRAY: {
1140                 switch (crq->msg_subtype) {
1141                 case CARM_ARRAY_INFO:
1142                         carm_handle_array_info(host, crq, mem, error);
1143                         break;
1144                 default:
1145                         /* unknown / invalid response */
1146                         goto err_out;
1147                 }
1148                 break;
1149         }
1150
1151         default:
1152                 /* unknown / invalid response */
1153                 goto err_out;
1154         }
1155
1156         return;
1157
1158 err_out:
1159         printk(KERN_WARNING DRV_NAME "(%s): BUG: unhandled message type %d/%d\n",
1160                pci_name(host->pdev), crq->msg_type, crq->msg_subtype);
1161         carm_end_rq(host, crq, -EIO);
1162 }
1163
1164 static inline void carm_handle_responses(struct carm_host *host)
1165 {
1166         void __iomem *mmio = host->mmio;
1167         struct carm_response *resp = (struct carm_response *) host->shm;
1168         unsigned int work = 0;
1169         unsigned int idx = host->resp_idx % RMSG_Q_LEN;
1170
1171         while (1) {
1172                 u32 status = le32_to_cpu(resp[idx].status);
1173
1174                 if (status == 0xffffffff) {
1175                         VPRINTK("ending response on index %u\n", idx);
1176                         writel(idx << 3, mmio + CARM_RESP_IDX);
1177                         break;
1178                 }
1179
1180                 /* response to a message we sent */
1181                 else if ((status & (1 << 31)) == 0) {
1182                         VPRINTK("handling msg response on index %u\n", idx);
1183                         carm_handle_resp(host, resp[idx].ret_handle, status);
1184                         resp[idx].status = cpu_to_le32(0xffffffff);
1185                 }
1186
1187                 /* asynchronous events the hardware throws our way */
1188                 else if ((status & 0xff000000) == (1 << 31)) {
1189                         u8 *evt_type_ptr = (u8 *) &resp[idx];
1190                         u8 evt_type = *evt_type_ptr;
1191                         printk(KERN_WARNING DRV_NAME "(%s): unhandled event type %d\n",
1192                                pci_name(host->pdev), (int) evt_type);
1193                         resp[idx].status = cpu_to_le32(0xffffffff);
1194                 }
1195
1196                 idx = NEXT_RESP(idx);
1197                 work++;
1198         }
1199
1200         VPRINTK("EXIT, work==%u\n", work);
1201         host->resp_idx += work;
1202 }
1203
1204 static irqreturn_t carm_interrupt(int irq, void *__host)
1205 {
1206         struct carm_host *host = __host;
1207         void __iomem *mmio;
1208         u32 mask;
1209         int handled = 0;
1210         unsigned long flags;
1211
1212         if (!host) {
1213                 VPRINTK("no host\n");
1214                 return IRQ_NONE;
1215         }
1216
1217         spin_lock_irqsave(&host->lock, flags);
1218
1219         mmio = host->mmio;
1220
1221         /* reading should also clear interrupts */
1222         mask = readl(mmio + CARM_INT_STAT);
1223
1224         if (mask == 0 || mask == 0xffffffff) {
1225                 VPRINTK("no work, mask == 0x%x\n", mask);
1226                 goto out;
1227         }
1228
1229         if (mask & INT_ACK_MASK)
1230                 writel(mask, mmio + CARM_INT_STAT);
1231
1232         if (unlikely(host->state == HST_INVALID)) {
1233                 VPRINTK("not initialized yet, mask = 0x%x\n", mask);
1234                 goto out;
1235         }
1236
1237         if (mask & CARM_HAVE_RESP) {
1238                 handled = 1;
1239                 carm_handle_responses(host);
1240         }
1241
1242 out:
1243         spin_unlock_irqrestore(&host->lock, flags);
1244         VPRINTK("EXIT\n");
1245         return IRQ_RETVAL(handled);
1246 }
1247
1248 static void carm_fsm_task (struct work_struct *work)
1249 {
1250         struct carm_host *host =
1251                 container_of(work, struct carm_host, fsm_task);
1252         unsigned long flags;
1253         unsigned int state;
1254         int rc, i, next_dev;
1255         int reschedule = 0;
1256         int new_state = HST_INVALID;
1257
1258         spin_lock_irqsave(&host->lock, flags);
1259         state = host->state;
1260         spin_unlock_irqrestore(&host->lock, flags);
1261
1262         DPRINTK("ENTER, state == %s\n", state_name[state]);
1263
1264         switch (state) {
1265         case HST_PROBE_START:
1266                 new_state = HST_ALLOC_BUF;
1267                 reschedule = 1;
1268                 break;
1269
1270         case HST_ALLOC_BUF:
1271                 rc = carm_send_special(host, carm_fill_alloc_buf);
1272                 if (rc) {
1273                         new_state = HST_ERROR;
1274                         reschedule = 1;
1275                 }
1276                 break;
1277
1278         case HST_SYNC_TIME:
1279                 rc = carm_send_special(host, carm_fill_sync_time);
1280                 if (rc) {
1281                         new_state = HST_ERROR;
1282                         reschedule = 1;
1283                 }
1284                 break;
1285
1286         case HST_GET_FW_VER:
1287                 rc = carm_send_special(host, carm_fill_get_fw_ver);
1288                 if (rc) {
1289                         new_state = HST_ERROR;
1290                         reschedule = 1;
1291                 }
1292                 break;
1293
1294         case HST_PORT_SCAN:
1295                 rc = carm_send_special(host, carm_fill_scan_channels);
1296                 if (rc) {
1297                         new_state = HST_ERROR;
1298                         reschedule = 1;
1299                 }
1300                 break;
1301
1302         case HST_DEV_SCAN_START:
1303                 host->cur_scan_dev = -1;
1304                 new_state = HST_DEV_SCAN;
1305                 reschedule = 1;
1306                 break;
1307
1308         case HST_DEV_SCAN:
1309                 next_dev = -1;
1310                 for (i = host->cur_scan_dev + 1; i < CARM_MAX_PORTS; i++)
1311                         if (host->dev_present & (1 << i)) {
1312                                 next_dev = i;
1313                                 break;
1314                         }
1315
1316                 if (next_dev >= 0) {
1317                         host->cur_scan_dev = next_dev;
1318                         rc = carm_array_info(host, next_dev);
1319                         if (rc) {
1320                                 new_state = HST_ERROR;
1321                                 reschedule = 1;
1322                         }
1323                 } else {
1324                         new_state = HST_DEV_ACTIVATE;
1325                         reschedule = 1;
1326                 }
1327                 break;
1328
1329         case HST_DEV_ACTIVATE: {
1330                 int activated = 0;
1331                 for (i = 0; i < CARM_MAX_PORTS; i++)
1332                         if (host->dev_active & (1 << i)) {
1333                                 struct carm_port *port = &host->port[i];
1334                                 struct gendisk *disk = port->disk;
1335
1336                                 set_capacity(disk, port->capacity);
1337                                 add_disk(disk);
1338                                 activated++;
1339                         }
1340
1341                 printk(KERN_INFO DRV_NAME "(%s): %d ports activated\n",
1342                        pci_name(host->pdev), activated);
1343
1344                 new_state = HST_PROBE_FINISHED;
1345                 reschedule = 1;
1346                 break;
1347         }
1348
1349         case HST_PROBE_FINISHED:
1350                 complete(&host->probe_comp);
1351                 break;
1352
1353         case HST_ERROR:
1354                 /* FIXME: TODO */
1355                 break;
1356
1357         default:
1358                 /* should never occur */
1359                 printk(KERN_ERR PFX "BUG: unknown state %d\n", state);
1360                 assert(0);
1361                 break;
1362         }
1363
1364         if (new_state != HST_INVALID) {
1365                 spin_lock_irqsave(&host->lock, flags);
1366                 host->state = new_state;
1367                 spin_unlock_irqrestore(&host->lock, flags);
1368         }
1369         if (reschedule)
1370                 schedule_work(&host->fsm_task);
1371 }
1372
1373 static int carm_init_wait(void __iomem *mmio, u32 bits, unsigned int test_bit)
1374 {
1375         unsigned int i;
1376
1377         for (i = 0; i < 50000; i++) {
1378                 u32 tmp = readl(mmio + CARM_LMUC);
1379                 udelay(100);
1380
1381                 if (test_bit) {
1382                         if ((tmp & bits) == bits)
1383                                 return 0;
1384                 } else {
1385                         if ((tmp & bits) == 0)
1386                                 return 0;
1387                 }
1388
1389                 cond_resched();
1390         }
1391
1392         printk(KERN_ERR PFX "carm_init_wait timeout, bits == 0x%x, test_bit == %s\n",
1393                bits, test_bit ? "yes" : "no");
1394         return -EBUSY;
1395 }
1396
1397 static void carm_init_responses(struct carm_host *host)
1398 {
1399         void __iomem *mmio = host->mmio;
1400         unsigned int i;
1401         struct carm_response *resp = (struct carm_response *) host->shm;
1402
1403         for (i = 0; i < RMSG_Q_LEN; i++)
1404                 resp[i].status = cpu_to_le32(0xffffffff);
1405
1406         writel(0, mmio + CARM_RESP_IDX);
1407 }
1408
1409 static int carm_init_host(struct carm_host *host)
1410 {
1411         void __iomem *mmio = host->mmio;
1412         u32 tmp;
1413         u8 tmp8;
1414         int rc;
1415
1416         DPRINTK("ENTER\n");
1417
1418         writel(0, mmio + CARM_INT_MASK);
1419
1420         tmp8 = readb(mmio + CARM_INITC);
1421         if (tmp8 & 0x01) {
1422                 tmp8 &= ~0x01;
1423                 writeb(tmp8, mmio + CARM_INITC);
1424                 readb(mmio + CARM_INITC);       /* flush */
1425
1426                 DPRINTK("snooze...\n");
1427                 msleep(5000);
1428         }
1429
1430         tmp = readl(mmio + CARM_HMUC);
1431         if (tmp & CARM_CME) {
1432                 DPRINTK("CME bit present, waiting\n");
1433                 rc = carm_init_wait(mmio, CARM_CME, 1);
1434                 if (rc) {
1435                         DPRINTK("EXIT, carm_init_wait 1 failed\n");
1436                         return rc;
1437                 }
1438         }
1439         if (tmp & CARM_RME) {
1440                 DPRINTK("RME bit present, waiting\n");
1441                 rc = carm_init_wait(mmio, CARM_RME, 1);
1442                 if (rc) {
1443                         DPRINTK("EXIT, carm_init_wait 2 failed\n");
1444                         return rc;
1445                 }
1446         }
1447
1448         tmp &= ~(CARM_RME | CARM_CME);
1449         writel(tmp, mmio + CARM_HMUC);
1450         readl(mmio + CARM_HMUC);        /* flush */
1451
1452         rc = carm_init_wait(mmio, CARM_RME | CARM_CME, 0);
1453         if (rc) {
1454                 DPRINTK("EXIT, carm_init_wait 3 failed\n");
1455                 return rc;
1456         }
1457
1458         carm_init_buckets(mmio);
1459
1460         writel(host->shm_dma & 0xffffffff, mmio + RBUF_ADDR_LO);
1461         writel((host->shm_dma >> 16) >> 16, mmio + RBUF_ADDR_HI);
1462         writel(RBUF_LEN, mmio + RBUF_BYTE_SZ);
1463
1464         tmp = readl(mmio + CARM_HMUC);
1465         tmp |= (CARM_RME | CARM_CME | CARM_WZBC);
1466         writel(tmp, mmio + CARM_HMUC);
1467         readl(mmio + CARM_HMUC);        /* flush */
1468
1469         rc = carm_init_wait(mmio, CARM_RME | CARM_CME, 1);
1470         if (rc) {
1471                 DPRINTK("EXIT, carm_init_wait 4 failed\n");
1472                 return rc;
1473         }
1474
1475         writel(0, mmio + CARM_HMPHA);
1476         writel(INT_DEF_MASK, mmio + CARM_INT_MASK);
1477
1478         carm_init_responses(host);
1479
1480         /* start initialization, probing state machine */
1481         spin_lock_irq(&host->lock);
1482         assert(host->state == HST_INVALID);
1483         host->state = HST_PROBE_START;
1484         spin_unlock_irq(&host->lock);
1485         schedule_work(&host->fsm_task);
1486
1487         DPRINTK("EXIT\n");
1488         return 0;
1489 }
1490
1491 static int carm_init_disks(struct carm_host *host)
1492 {
1493         unsigned int i;
1494         int rc = 0;
1495
1496         for (i = 0; i < CARM_MAX_PORTS; i++) {
1497                 struct gendisk *disk;
1498                 struct request_queue *q;
1499                 struct carm_port *port;
1500
1501                 port = &host->port[i];
1502                 port->host = host;
1503                 port->port_no = i;
1504
1505                 disk = alloc_disk(CARM_MINORS_PER_MAJOR);
1506                 if (!disk) {
1507                         rc = -ENOMEM;
1508                         break;
1509                 }
1510
1511                 port->disk = disk;
1512                 sprintf(disk->disk_name, DRV_NAME "/%u",
1513                         (unsigned int) (host->id * CARM_MAX_PORTS) + i);
1514                 disk->major = host->major;
1515                 disk->first_minor = i * CARM_MINORS_PER_MAJOR;
1516                 disk->fops = &carm_bd_ops;
1517                 disk->private_data = port;
1518
1519                 q = blk_init_queue(carm_rq_fn, &host->lock);
1520                 if (!q) {
1521                         rc = -ENOMEM;
1522                         break;
1523                 }
1524                 disk->queue = q;
1525                 blk_queue_max_segments(q, CARM_MAX_REQ_SG);
1526                 blk_queue_segment_boundary(q, CARM_SG_BOUNDARY);
1527
1528                 q->queuedata = port;
1529         }
1530
1531         return rc;
1532 }
1533
1534 static void carm_free_disks(struct carm_host *host)
1535 {
1536         unsigned int i;
1537
1538         for (i = 0; i < CARM_MAX_PORTS; i++) {
1539                 struct gendisk *disk = host->port[i].disk;
1540                 if (disk) {
1541                         struct request_queue *q = disk->queue;
1542
1543                         if (disk->flags & GENHD_FL_UP)
1544                                 del_gendisk(disk);
1545                         if (q)
1546                                 blk_cleanup_queue(q);
1547                         put_disk(disk);
1548                 }
1549         }
1550 }
1551
1552 static int carm_init_shm(struct carm_host *host)
1553 {
1554         host->shm = pci_alloc_consistent(host->pdev, CARM_SHM_SIZE,
1555                                          &host->shm_dma);
1556         if (!host->shm)
1557                 return -ENOMEM;
1558
1559         host->msg_base = host->shm + RBUF_LEN;
1560         host->msg_dma = host->shm_dma + RBUF_LEN;
1561
1562         memset(host->shm, 0xff, RBUF_LEN);
1563         memset(host->msg_base, 0, PDC_SHM_SIZE - RBUF_LEN);
1564
1565         return 0;
1566 }
1567
1568 static int carm_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
1569 {
1570         struct carm_host *host;
1571         unsigned int pci_dac;
1572         int rc;
1573         struct request_queue *q;
1574         unsigned int i;
1575
1576         printk_once(KERN_DEBUG DRV_NAME " version " DRV_VERSION "\n");
1577
1578         rc = pci_enable_device(pdev);
1579         if (rc)
1580                 return rc;
1581
1582         rc = pci_request_regions(pdev, DRV_NAME);
1583         if (rc)
1584                 goto err_out;
1585
1586 #ifdef IF_64BIT_DMA_IS_POSSIBLE /* grrrr... */
1587         rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
1588         if (!rc) {
1589                 rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
1590                 if (rc) {
1591                         printk(KERN_ERR DRV_NAME "(%s): consistent DMA mask failure\n",
1592                                 pci_name(pdev));
1593                         goto err_out_regions;
1594                 }
1595                 pci_dac = 1;
1596         } else {
1597 #endif
1598                 rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
1599                 if (rc) {
1600                         printk(KERN_ERR DRV_NAME "(%s): DMA mask failure\n",
1601                                 pci_name(pdev));
1602                         goto err_out_regions;
1603                 }
1604                 pci_dac = 0;
1605 #ifdef IF_64BIT_DMA_IS_POSSIBLE /* grrrr... */
1606         }
1607 #endif
1608
1609         host = kzalloc(sizeof(*host), GFP_KERNEL);
1610         if (!host) {
1611                 printk(KERN_ERR DRV_NAME "(%s): memory alloc failure\n",
1612                        pci_name(pdev));
1613                 rc = -ENOMEM;
1614                 goto err_out_regions;
1615         }
1616
1617         host->pdev = pdev;
1618         host->flags = pci_dac ? FL_DAC : 0;
1619         spin_lock_init(&host->lock);
1620         INIT_WORK(&host->fsm_task, carm_fsm_task);
1621         init_completion(&host->probe_comp);
1622
1623         for (i = 0; i < ARRAY_SIZE(host->req); i++)
1624                 host->req[i].tag = i;
1625
1626         host->mmio = ioremap(pci_resource_start(pdev, 0),
1627                              pci_resource_len(pdev, 0));
1628         if (!host->mmio) {
1629                 printk(KERN_ERR DRV_NAME "(%s): MMIO alloc failure\n",
1630                        pci_name(pdev));
1631                 rc = -ENOMEM;
1632                 goto err_out_kfree;
1633         }
1634
1635         rc = carm_init_shm(host);
1636         if (rc) {
1637                 printk(KERN_ERR DRV_NAME "(%s): DMA SHM alloc failure\n",
1638                        pci_name(pdev));
1639                 goto err_out_iounmap;
1640         }
1641
1642         q = blk_init_queue(carm_oob_rq_fn, &host->lock);
1643         if (!q) {
1644                 printk(KERN_ERR DRV_NAME "(%s): OOB queue alloc failure\n",
1645                        pci_name(pdev));
1646                 rc = -ENOMEM;
1647                 goto err_out_pci_free;
1648         }
1649         host->oob_q = q;
1650         q->queuedata = host;
1651
1652         /*
1653          * Figure out which major to use: 160, 161, or dynamic
1654          */
1655         if (!test_and_set_bit(0, &carm_major_alloc))
1656                 host->major = 160;
1657         else if (!test_and_set_bit(1, &carm_major_alloc))
1658                 host->major = 161;
1659         else
1660                 host->flags |= FL_DYN_MAJOR;
1661
1662         host->id = carm_host_id;
1663         sprintf(host->name, DRV_NAME "%d", carm_host_id);
1664
1665         rc = register_blkdev(host->major, host->name);
1666         if (rc < 0)
1667                 goto err_out_free_majors;
1668         if (host->flags & FL_DYN_MAJOR)
1669                 host->major = rc;
1670
1671         rc = carm_init_disks(host);
1672         if (rc)
1673                 goto err_out_blkdev_disks;
1674
1675         pci_set_master(pdev);
1676
1677         rc = request_irq(pdev->irq, carm_interrupt, IRQF_SHARED, DRV_NAME, host);
1678         if (rc) {
1679                 printk(KERN_ERR DRV_NAME "(%s): irq alloc failure\n",
1680                        pci_name(pdev));
1681                 goto err_out_blkdev_disks;
1682         }
1683
1684         rc = carm_init_host(host);
1685         if (rc)
1686                 goto err_out_free_irq;
1687
1688         DPRINTK("waiting for probe_comp\n");
1689         wait_for_completion(&host->probe_comp);
1690
1691         printk(KERN_INFO "%s: pci %s, ports %d, io %llx, irq %u, major %d\n",
1692                host->name, pci_name(pdev), (int) CARM_MAX_PORTS,
1693                (unsigned long long)pci_resource_start(pdev, 0),
1694                    pdev->irq, host->major);
1695
1696         carm_host_id++;
1697         pci_set_drvdata(pdev, host);
1698         return 0;
1699
1700 err_out_free_irq:
1701         free_irq(pdev->irq, host);
1702 err_out_blkdev_disks:
1703         carm_free_disks(host);
1704         unregister_blkdev(host->major, host->name);
1705 err_out_free_majors:
1706         if (host->major == 160)
1707                 clear_bit(0, &carm_major_alloc);
1708         else if (host->major == 161)
1709                 clear_bit(1, &carm_major_alloc);
1710         blk_cleanup_queue(host->oob_q);
1711 err_out_pci_free:
1712         pci_free_consistent(pdev, CARM_SHM_SIZE, host->shm, host->shm_dma);
1713 err_out_iounmap:
1714         iounmap(host->mmio);
1715 err_out_kfree:
1716         kfree(host);
1717 err_out_regions:
1718         pci_release_regions(pdev);
1719 err_out:
1720         pci_disable_device(pdev);
1721         return rc;
1722 }
1723
1724 static void carm_remove_one (struct pci_dev *pdev)
1725 {
1726         struct carm_host *host = pci_get_drvdata(pdev);
1727
1728         if (!host) {
1729                 printk(KERN_ERR PFX "BUG: no host data for PCI(%s)\n",
1730                        pci_name(pdev));
1731                 return;
1732         }
1733
1734         free_irq(pdev->irq, host);
1735         carm_free_disks(host);
1736         unregister_blkdev(host->major, host->name);
1737         if (host->major == 160)
1738                 clear_bit(0, &carm_major_alloc);
1739         else if (host->major == 161)
1740                 clear_bit(1, &carm_major_alloc);
1741         blk_cleanup_queue(host->oob_q);
1742         pci_free_consistent(pdev, CARM_SHM_SIZE, host->shm, host->shm_dma);
1743         iounmap(host->mmio);
1744         kfree(host);
1745         pci_release_regions(pdev);
1746         pci_disable_device(pdev);
1747         pci_set_drvdata(pdev, NULL);
1748 }
1749
1750 static int __init carm_init(void)
1751 {
1752         return pci_register_driver(&carm_driver);
1753 }
1754
1755 static void __exit carm_exit(void)
1756 {
1757         pci_unregister_driver(&carm_driver);
1758 }
1759
1760 module_init(carm_init);
1761 module_exit(carm_exit);
1762
1763