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, __FUNCTION__, ## args)
  83 #ifdef CARM_VERBOSE_DEBUG
  84 #define VPRINTK(fmt, args...) printk(KERN_ERR "%s: " fmt, __FUNCTION__, ## 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__,__FUNCTION__,__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 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 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_insert_request, tag == %u\n", idx);
 623         blk_insert_request(host->oob_q, crq->rq, 1, crq);
 624
 625         return 0;
 626
 627 err_out:
 628         spin_lock_irq(&host->lock);
 629         host->state = HST_ERROR;
 630         spin_unlock_irq(&host->lock);
 631         return rc;
 632 }
 633
 634 typedef unsigned int (*carm_sspc_t)(struct carm_host *, unsigned int, void *);
 635
 636 static int carm_send_special (struct carm_host *host, carm_sspc_t func)
 637 {
 638         struct carm_request *crq;
 639         struct carm_msg_ioctl *ioc;
 640         void *mem;
 641         unsigned int idx, msg_size;
 642         int rc;
 643
 644         crq = carm_get_special(host);
 645         if (!crq)
 646                 return -ENOMEM;
 647
 648         idx = crq->tag;
 649
 650         mem = carm_ref_msg(host, idx);
 651
 652         msg_size = func(host, idx, mem);
 653
 654         ioc = mem;
 655         crq->msg_type = ioc->type;
 656         crq->msg_subtype = ioc->subtype;
 657         rc = carm_lookup_bucket(msg_size);
 658         BUG_ON(rc < 0);
 659         crq->msg_bucket = (u32) rc;
 660
 661         DPRINTK("blk_insert_request, tag == %u\n", idx);
 662         blk_insert_request(host->oob_q, crq->rq, 1, crq);
 663
 664         return 0;
 665 }
 666
 667 static unsigned int carm_fill_sync_time(struct carm_host *host,
 668                                         unsigned int idx, void *mem)
 669 {
 670         struct timeval tv;
 671         struct carm_msg_sync_time *st = mem;
 672
 673         do_gettimeofday(&tv);
 674
 675         memset(st, 0, sizeof(*st));
 676         st->type        = CARM_MSG_MISC;
 677         st->subtype     = MISC_SET_TIME;
 678         st->handle      = cpu_to_le32(TAG_ENCODE(idx));
 679         st->timestamp   = cpu_to_le32(tv.tv_sec);
 680
 681         return sizeof(struct carm_msg_sync_time);
 682 }
 683
 684 static unsigned int carm_fill_alloc_buf(struct carm_host *host,
 685                                         unsigned int idx, void *mem)
 686 {
 687         struct carm_msg_allocbuf *ab = mem;
 688
 689         memset(ab, 0, sizeof(*ab));
 690         ab->type        = CARM_MSG_MISC;
 691         ab->subtype     = MISC_ALLOC_MEM;
 692         ab->handle      = cpu_to_le32(TAG_ENCODE(idx));
 693         ab->n_sg        = 1;
 694         ab->sg_type     = SGT_32BIT;
 695         ab->addr        = cpu_to_le32(host->shm_dma + (PDC_SHM_SIZE >> 1));
 696         ab->len         = cpu_to_le32(PDC_SHM_SIZE >> 1);
 697         ab->evt_pool    = cpu_to_le32(host->shm_dma + (16 * 1024));
 698         ab->n_evt       = cpu_to_le32(1024);
 699         ab->rbuf_pool   = cpu_to_le32(host->shm_dma);
 700         ab->n_rbuf      = cpu_to_le32(RMSG_Q_LEN);
 701         ab->msg_pool    = cpu_to_le32(host->shm_dma + RBUF_LEN);
 702         ab->n_msg       = cpu_to_le32(CARM_Q_LEN);
 703         ab->sg[0].start = cpu_to_le32(host->shm_dma + (PDC_SHM_SIZE >> 1));
 704         ab->sg[0].len   = cpu_to_le32(65536);
 705
 706         return sizeof(struct carm_msg_allocbuf);
 707 }
 708
 709 static unsigned int carm_fill_scan_channels(struct carm_host *host,
 710                                             unsigned int idx, void *mem)
 711 {
 712         struct carm_msg_ioctl *ioc = mem;
 713         u32 msg_data = (u32) (carm_ref_msg_dma(host, idx) +
 714                               IOC_SCAN_CHAN_OFFSET);
 715
 716         memset(ioc, 0, sizeof(*ioc));
 717         ioc->type       = CARM_MSG_IOCTL;
 718         ioc->subtype    = CARM_IOC_SCAN_CHAN;
 719         ioc->handle     = cpu_to_le32(TAG_ENCODE(idx));
 720         ioc->data_addr  = cpu_to_le32(msg_data);
 721
 722         /* fill output data area with "no device" default values */
 723         mem += IOC_SCAN_CHAN_OFFSET;
 724         memset(mem, IOC_SCAN_CHAN_NODEV, CARM_MAX_PORTS);
 725
 726         return IOC_SCAN_CHAN_OFFSET + CARM_MAX_PORTS;
 727 }
 728
 729 static unsigned int carm_fill_get_fw_ver(struct carm_host *host,
 730                                          unsigned int idx, void *mem)
 731 {
 732         struct carm_msg_get_fw_ver *ioc = mem;
 733         u32 msg_data = (u32) (carm_ref_msg_dma(host, idx) + sizeof(*ioc));
 734
 735         memset(ioc, 0, sizeof(*ioc));
 736         ioc->type       = CARM_MSG_MISC;
 737         ioc->subtype    = MISC_GET_FW_VER;
 738         ioc->handle     = cpu_to_le32(TAG_ENCODE(idx));
 739         ioc->data_addr  = cpu_to_le32(msg_data);
 740
 741         return sizeof(struct carm_msg_get_fw_ver) +
 742                sizeof(struct carm_fw_ver);
 743 }
 744
 745 static inline void carm_end_request_queued(struct carm_host *host,
 746                                            struct carm_request *crq,
 747                                            int uptodate)
 748 {
 749         struct request *req = crq->rq;
 750         int rc;
 751
 752         rc = end_that_request_first(req, uptodate, req->hard_nr_sectors);
 753         assert(rc == 0);
 754
 755         end_that_request_last(req, uptodate);
 756
 757         rc = carm_put_request(host, crq);
 758         assert(rc == 0);
 759 }
 760
 761 static inline void carm_push_q (struct carm_host *host, struct request_queue *q)
 762 {
 763         unsigned int idx = host->wait_q_prod % CARM_MAX_WAIT_Q;
 764
 765         blk_stop_queue(q);
 766         VPRINTK("STOPPED QUEUE %p\n", q);
 767
 768         host->wait_q[idx] = q;
 769         host->wait_q_prod++;
 770         BUG_ON(host->wait_q_prod == host->wait_q_cons); /* overrun */
 771 }
 772
 773 static inline struct request_queue *carm_pop_q(struct carm_host *host)
 774 {
 775         unsigned int idx;
 776
 777         if (host->wait_q_prod == host->wait_q_cons)
 778                 return NULL;
 779
 780         idx = host->wait_q_cons % CARM_MAX_WAIT_Q;
 781         host->wait_q_cons++;
 782
 783         return host->wait_q[idx];
 784 }
 785
 786 static inline void carm_round_robin(struct carm_host *host)
 787 {
 788         struct request_queue *q = carm_pop_q(host);
 789         if (q) {
 790                 blk_start_queue(q);
 791                 VPRINTK("STARTED QUEUE %p\n", q);
 792         }
 793 }
 794
 795 static inline void carm_end_rq(struct carm_host *host, struct carm_request *crq,
 796                         int is_ok)
 797 {
 798         carm_end_request_queued(host, crq, is_ok);
 799         if (max_queue == 1)
 800                 carm_round_robin(host);
 801         else if ((host->n_msgs <= CARM_MSG_LOW_WATER) &&
 802                  (host->hw_sg_used <= CARM_SG_LOW_WATER)) {
 803                 carm_round_robin(host);
 804         }
 805 }
 806
 807 static void carm_oob_rq_fn(struct request_queue *q)
 808 {
 809         struct carm_host *host = q->queuedata;
 810         struct carm_request *crq;
 811         struct request *rq;
 812         int rc;
 813
 814         while (1) {
 815                 DPRINTK("get req\n");
 816                 rq = elv_next_request(q);
 817                 if (!rq)
 818                         break;
 819
 820                 blkdev_dequeue_request(rq);
 821
 822                 crq = rq->special;
 823                 assert(crq != NULL);
 824                 assert(crq->rq == rq);
 825
 826                 crq->n_elem = 0;
 827
 828                 DPRINTK("send req\n");
 829                 rc = carm_send_msg(host, crq);
 830                 if (rc) {
 831                         blk_requeue_request(q, rq);
 832                         carm_push_q(host, q);
 833                         return;         /* call us again later, eventually */
 834                 }
 835         }
 836 }
 837
 838 static void carm_rq_fn(struct request_queue *q)
 839 {
 840         struct carm_port *port = q->queuedata;
 841         struct carm_host *host = port->host;
 842         struct carm_msg_rw *msg;
 843         struct carm_request *crq;
 844         struct request *rq;
 845         struct scatterlist *sg;
 846         int writing = 0, pci_dir, i, n_elem, rc;
 847         u32 tmp;
 848         unsigned int msg_size;
 849
 850 queue_one_request:
 851         VPRINTK("get req\n");
 852         rq = elv_next_request(q);
 853         if (!rq)
 854                 return;
 855
 856         crq = carm_get_request(host);
 857         if (!crq) {
 858                 carm_push_q(host, q);
 859                 return;         /* call us again later, eventually */
 860         }
 861         crq->rq = rq;
 862
 863         blkdev_dequeue_request(rq);
 864
 865         if (rq_data_dir(rq) == WRITE) {
 866                 writing = 1;
 867                 pci_dir = PCI_DMA_TODEVICE;
 868         } else {
 869                 pci_dir = PCI_DMA_FROMDEVICE;
 870         }
 871
 872         /* get scatterlist from block layer */
 873         sg = &crq->sg[0];
 874         n_elem = blk_rq_map_sg(q, rq, sg);
 875         if (n_elem <= 0) {
 876                 carm_end_rq(host, crq, 0);
 877                 return;         /* request with no s/g entries? */
 878         }
 879
 880         /* map scatterlist to PCI bus addresses */
 881         n_elem = pci_map_sg(host->pdev, sg, n_elem, pci_dir);
 882         if (n_elem <= 0) {
 883                 carm_end_rq(host, crq, 0);
 884                 return;         /* request with no s/g entries? */
 885         }
 886         crq->n_elem = n_elem;
 887         crq->port = port;
 888         host->hw_sg_used += n_elem;
 889
 890         /*
 891          * build read/write message
 892          */
 893
 894         VPRINTK("build msg\n");
 895         msg = (struct carm_msg_rw *) carm_ref_msg(host, crq->tag);
 896
 897         if (writing) {
 898                 msg->type = CARM_MSG_WRITE;
 899                 crq->msg_type = CARM_MSG_WRITE;
 900         } else {
 901                 msg->type = CARM_MSG_READ;
 902                 crq->msg_type = CARM_MSG_READ;
 903         }
 904
 905         msg->id         = port->port_no;
 906         msg->sg_count   = n_elem;
 907         msg->sg_type    = SGT_32BIT;
 908         msg->handle     = cpu_to_le32(TAG_ENCODE(crq->tag));
 909         msg->lba        = cpu_to_le32(rq->sector & 0xffffffff);
 910         tmp             = (rq->sector >> 16) >> 16;
 911         msg->lba_high   = cpu_to_le16( (u16) tmp );
 912         msg->lba_count  = cpu_to_le16(rq->nr_sectors);
 913
 914         msg_size = sizeof(struct carm_msg_rw) - sizeof(msg->sg);
 915         for (i = 0; i < n_elem; i++) {
 916                 struct carm_msg_sg *carm_sg = &msg->sg[i];
 917                 carm_sg->start = cpu_to_le32(sg_dma_address(&crq->sg[i]));
 918                 carm_sg->len = cpu_to_le32(sg_dma_len(&crq->sg[i]));
 919                 msg_size += sizeof(struct carm_msg_sg);
 920         }
 921
 922         rc = carm_lookup_bucket(msg_size);
 923         BUG_ON(rc < 0);
 924         crq->msg_bucket = (u32) rc;
 925
 926         /*
 927          * queue read/write message to hardware
 928          */
 929
 930         VPRINTK("send msg, tag == %u\n", crq->tag);
 931         rc = carm_send_msg(host, crq);
 932         if (rc) {
 933                 carm_put_request(host, crq);
 934                 blk_requeue_request(q, rq);
 935                 carm_push_q(host, q);
 936                 return;         /* call us again later, eventually */
 937         }
 938
 939         goto queue_one_request;
 940 }
 941
 942 static void carm_handle_array_info(struct carm_host *host,
 943                                    struct carm_request *crq, u8 *mem,
 944                                    int is_ok)
 945 {
 946         struct carm_port *port;
 947         u8 *msg_data = mem + sizeof(struct carm_array_info);
 948         struct carm_array_info *desc = (struct carm_array_info *) msg_data;
 949         u64 lo, hi;
 950         int cur_port;
 951         size_t slen;
 952
 953         DPRINTK("ENTER\n");
 954
 955         carm_end_rq(host, crq, is_ok);
 956
 957         if (!is_ok)
 958                 goto out;
 959         if (le32_to_cpu(desc->array_status) & ARRAY_NO_EXIST)
 960                 goto out;
 961
 962         cur_port = host->cur_scan_dev;
 963
 964         /* should never occur */
 965         if ((cur_port < 0) || (cur_port >= CARM_MAX_PORTS)) {
 966                 printk(KERN_ERR PFX "BUG: cur_scan_dev==%d, array_id==%d\n",
 967                        cur_port, (int) desc->array_id);
 968                 goto out;
 969         }
 970
 971         port = &host->port[cur_port];
 972
 973         lo = (u64) le32_to_cpu(desc->size);
 974         hi = (u64) le16_to_cpu(desc->size_hi);
 975
 976         port->capacity = lo | (hi << 32);
 977         port->dev_geom_head = le16_to_cpu(desc->head);
 978         port->dev_geom_sect = le16_to_cpu(desc->sect);
 979         port->dev_geom_cyl = le16_to_cpu(desc->cyl);
 980
 981         host->dev_active |= (1 << cur_port);
 982
 983         strncpy(port->name, desc->name, sizeof(port->name));
 984         port->name[sizeof(port->name) - 1] = 0;
 985         slen = strlen(port->name);
 986         while (slen && (port->name[slen - 1] == ' ')) {
 987                 port->name[slen - 1] = 0;
 988                 slen--;
 989         }
 990
 991         printk(KERN_INFO DRV_NAME "(%s): port %u device %Lu sectors\n",
 992                pci_name(host->pdev), port->port_no,
 993                (unsigned long long) port->capacity);
 994         printk(KERN_INFO DRV_NAME "(%s): port %u device \"%s\"\n",
 995                pci_name(host->pdev), port->port_no, port->name);
 996
 997 out:
 998         assert(host->state == HST_DEV_SCAN);
 999         schedule_work(&host->fsm_task);
1000 }
1001
1002 static void carm_handle_scan_chan(struct carm_host *host,
1003                                   struct carm_request *crq, u8 *mem,
1004                                   int is_ok)
1005 {
1006         u8 *msg_data = mem + IOC_SCAN_CHAN_OFFSET;
1007         unsigned int i, dev_count = 0;
1008         int new_state = HST_DEV_SCAN_START;
1009
1010         DPRINTK("ENTER\n");
1011
1012         carm_end_rq(host, crq, is_ok);
1013
1014         if (!is_ok) {
1015                 new_state = HST_ERROR;
1016                 goto out;
1017         }
1018
1019         /* TODO: scan and support non-disk devices */
1020         for (i = 0; i < 8; i++)
1021                 if (msg_data[i] == 0) { /* direct-access device (disk) */
1022                         host->dev_present |= (1 << i);
1023                         dev_count++;
1024                 }
1025
1026         printk(KERN_INFO DRV_NAME "(%s): found %u interesting devices\n",
1027                pci_name(host->pdev), dev_count);
1028
1029 out:
1030         assert(host->state == HST_PORT_SCAN);
1031         host->state = new_state;
1032         schedule_work(&host->fsm_task);
1033 }
1034
1035 static void carm_handle_generic(struct carm_host *host,
1036                                 struct carm_request *crq, int is_ok,
1037                                 int cur_state, int next_state)
1038 {
1039         DPRINTK("ENTER\n");
1040
1041         carm_end_rq(host, crq, is_ok);
1042
1043         assert(host->state == cur_state);
1044         if (is_ok)
1045                 host->state = next_state;
1046         else
1047                 host->state = HST_ERROR;
1048         schedule_work(&host->fsm_task);
1049 }
1050
1051 static inline void carm_handle_rw(struct carm_host *host,
1052                                   struct carm_request *crq, int is_ok)
1053 {
1054         int pci_dir;
1055
1056         VPRINTK("ENTER\n");
1057
1058         if (rq_data_dir(crq->rq) == WRITE)
1059                 pci_dir = PCI_DMA_TODEVICE;
1060         else
1061                 pci_dir = PCI_DMA_FROMDEVICE;
1062
1063         pci_unmap_sg(host->pdev, &crq->sg[0], crq->n_elem, pci_dir);
1064
1065         carm_end_rq(host, crq, is_ok);
1066 }
1067
1068 static inline void carm_handle_resp(struct carm_host *host,
1069                                     __le32 ret_handle_le, u32 status)
1070 {
1071         u32 handle = le32_to_cpu(ret_handle_le);
1072         unsigned int msg_idx;
1073         struct carm_request *crq;
1074         int is_ok = (status == RMSG_OK);
1075         u8 *mem;
1076
1077         VPRINTK("ENTER, handle == 0x%x\n", handle);
1078
1079         if (unlikely(!TAG_VALID(handle))) {
1080                 printk(KERN_ERR DRV_NAME "(%s): BUG: invalid tag 0x%x\n",
1081                        pci_name(host->pdev), handle);
1082                 return;
1083         }
1084
1085         msg_idx = TAG_DECODE(handle);
1086         VPRINTK("tag == %u\n", msg_idx);
1087
1088         crq = &host->req[msg_idx];
1089
1090         /* fast path */
1091         if (likely(crq->msg_type == CARM_MSG_READ ||
1092                    crq->msg_type == CARM_MSG_WRITE)) {
1093                 carm_handle_rw(host, crq, is_ok);
1094                 return;
1095         }
1096
1097         mem = carm_ref_msg(host, msg_idx);
1098
1099         switch (crq->msg_type) {
1100         case CARM_MSG_IOCTL: {
1101                 switch (crq->msg_subtype) {
1102                 case CARM_IOC_SCAN_CHAN:
1103                         carm_handle_scan_chan(host, crq, mem, is_ok);
1104                         break;
1105                 default:
1106                         /* unknown / invalid response */
1107                         goto err_out;
1108                 }
1109                 break;
1110         }
1111
1112         case CARM_MSG_MISC: {
1113                 switch (crq->msg_subtype) {
1114                 case MISC_ALLOC_MEM:
1115                         carm_handle_generic(host, crq, is_ok,
1116                                             HST_ALLOC_BUF, HST_SYNC_TIME);
1117                         break;
1118                 case MISC_SET_TIME:
1119                         carm_handle_generic(host, crq, is_ok,
1120                                             HST_SYNC_TIME, HST_GET_FW_VER);
1121                         break;
1122                 case MISC_GET_FW_VER: {
1123                         struct carm_fw_ver *ver = (struct carm_fw_ver *)
1124                                 mem + sizeof(struct carm_msg_get_fw_ver);
1125                         if (is_ok) {
1126                                 host->fw_ver = le32_to_cpu(ver->version);
1127                                 host->flags |= (ver->features & FL_FW_VER_MASK);
1128                         }
1129                         carm_handle_generic(host, crq, is_ok,
1130                                             HST_GET_FW_VER, HST_PORT_SCAN);
1131                         break;
1132                 }
1133                 default:
1134                         /* unknown / invalid response */
1135                         goto err_out;
1136                 }
1137                 break;
1138         }
1139
1140         case CARM_MSG_ARRAY: {
1141                 switch (crq->msg_subtype) {
1142                 case CARM_ARRAY_INFO:
1143                         carm_handle_array_info(host, crq, mem, is_ok);
1144                         break;
1145                 default:
1146                         /* unknown / invalid response */
1147                         goto err_out;
1148                 }
1149                 break;
1150         }
1151
1152         default:
1153                 /* unknown / invalid response */
1154                 goto err_out;
1155         }
1156
1157         return;
1158
1159 err_out:
1160         printk(KERN_WARNING DRV_NAME "(%s): BUG: unhandled message type %d/%d\n",
1161                pci_name(host->pdev), crq->msg_type, crq->msg_subtype);
1162         carm_end_rq(host, crq, 0);
1163 }
1164
1165 static inline void carm_handle_responses(struct carm_host *host)
1166 {
1167         void __iomem *mmio = host->mmio;
1168         struct carm_response *resp = (struct carm_response *) host->shm;
1169         unsigned int work = 0;
1170         unsigned int idx = host->resp_idx % RMSG_Q_LEN;
1171
1172         while (1) {
1173                 u32 status = le32_to_cpu(resp[idx].status);
1174
1175                 if (status == 0xffffffff) {
1176                         VPRINTK("ending response on index %u\n", idx);
1177                         writel(idx << 3, mmio + CARM_RESP_IDX);
1178                         break;
1179                 }
1180
1181                 /* response to a message we sent */
1182                 else if ((status & (1 << 31)) == 0) {
1183                         VPRINTK("handling msg response on index %u\n", idx);
1184                         carm_handle_resp(host, resp[idx].ret_handle, status);
1185                         resp[idx].status = cpu_to_le32(0xffffffff);
1186                 }
1187
1188                 /* asynchronous events the hardware throws our way */
1189                 else if ((status & 0xff000000) == (1 << 31)) {
1190                         u8 *evt_type_ptr = (u8 *) &resp[idx];
1191                         u8 evt_type = *evt_type_ptr;
1192                         printk(KERN_WARNING DRV_NAME "(%s): unhandled event type %d\n",
1193                                pci_name(host->pdev), (int) evt_type);
1194                         resp[idx].status = cpu_to_le32(0xffffffff);
1195                 }
1196
1197                 idx = NEXT_RESP(idx);
1198                 work++;
1199         }
1200
1201         VPRINTK("EXIT, work==%u\n", work);
1202         host->resp_idx += work;
1203 }
1204
1205 static irqreturn_t carm_interrupt(int irq, void *__host)
1206 {
1207         struct carm_host *host = __host;
1208         void __iomem *mmio;
1209         u32 mask;
1210         int handled = 0;
1211         unsigned long flags;
1212
1213         if (!host) {
1214                 VPRINTK("no host\n");
1215                 return IRQ_NONE;
1216         }
1217
1218         spin_lock_irqsave(&host->lock, flags);
1219
1220         mmio = host->mmio;
1221
1222         /* reading should also clear interrupts */
1223         mask = readl(mmio + CARM_INT_STAT);
1224
1225         if (mask == 0 || mask == 0xffffffff) {
1226                 VPRINTK("no work, mask == 0x%x\n", mask);
1227                 goto out;
1228         }
1229
1230         if (mask & INT_ACK_MASK)
1231                 writel(mask, mmio + CARM_INT_STAT);
1232
1233         if (unlikely(host->state == HST_INVALID)) {
1234                 VPRINTK("not initialized yet, mask = 0x%x\n", mask);
1235                 goto out;
1236         }
1237
1238         if (mask & CARM_HAVE_RESP) {
1239                 handled = 1;
1240                 carm_handle_responses(host);
1241         }
1242
1243 out:
1244         spin_unlock_irqrestore(&host->lock, flags);
1245         VPRINTK("EXIT\n");
1246         return IRQ_RETVAL(handled);
1247 }
1248
1249 static void carm_fsm_task (struct work_struct *work)
1250 {
1251         struct carm_host *host =
1252                 container_of(work, struct carm_host, fsm_task);
1253         unsigned long flags;
1254         unsigned int state;
1255         int rc, i, next_dev;
1256         int reschedule = 0;
1257         int new_state = HST_INVALID;
1258
1259         spin_lock_irqsave(&host->lock, flags);
1260         state = host->state;
1261         spin_unlock_irqrestore(&host->lock, flags);
1262
1263         DPRINTK("ENTER, state == %s\n", state_name[state]);
1264
1265         switch (state) {
1266         case HST_PROBE_START:
1267                 new_state = HST_ALLOC_BUF;
1268                 reschedule = 1;
1269                 break;
1270
1271         case HST_ALLOC_BUF:
1272                 rc = carm_send_special(host, carm_fill_alloc_buf);
1273                 if (rc) {
1274                         new_state = HST_ERROR;
1275                         reschedule = 1;
1276                 }
1277                 break;
1278
1279         case HST_SYNC_TIME:
1280                 rc = carm_send_special(host, carm_fill_sync_time);
1281                 if (rc) {
1282                         new_state = HST_ERROR;
1283                         reschedule = 1;
1284                 }
1285                 break;
1286
1287         case HST_GET_FW_VER:
1288                 rc = carm_send_special(host, carm_fill_get_fw_ver);
1289                 if (rc) {
1290                         new_state = HST_ERROR;
1291                         reschedule = 1;
1292                 }
1293                 break;
1294
1295         case HST_PORT_SCAN:
1296                 rc = carm_send_special(host, carm_fill_scan_channels);
1297                 if (rc) {
1298                         new_state = HST_ERROR;
1299                         reschedule = 1;
1300                 }
1301                 break;
1302
1303         case HST_DEV_SCAN_START:
1304                 host->cur_scan_dev = -1;
1305                 new_state = HST_DEV_SCAN;
1306                 reschedule = 1;
1307                 break;
1308
1309         case HST_DEV_SCAN:
1310                 next_dev = -1;
1311                 for (i = host->cur_scan_dev + 1; i < CARM_MAX_PORTS; i++)
1312                         if (host->dev_present & (1 << i)) {
1313                                 next_dev = i;
1314                                 break;
1315                         }
1316
1317                 if (next_dev >= 0) {
1318                         host->cur_scan_dev = next_dev;
1319                         rc = carm_array_info(host, next_dev);
1320                         if (rc) {
1321                                 new_state = HST_ERROR;
1322                                 reschedule = 1;
1323                         }
1324                 } else {
1325                         new_state = HST_DEV_ACTIVATE;
1326                         reschedule = 1;
1327                 }
1328                 break;
1329
1330         case HST_DEV_ACTIVATE: {
1331                 int activated = 0;
1332                 for (i = 0; i < CARM_MAX_PORTS; i++)
1333                         if (host->dev_active & (1 << i)) {
1334                                 struct carm_port *port = &host->port[i];
1335                                 struct gendisk *disk = port->disk;
1336
1337                                 set_capacity(disk, port->capacity);
1338                                 add_disk(disk);
1339                                 activated++;
1340                         }
1341
1342                 printk(KERN_INFO DRV_NAME "(%s): %d ports activated\n",
1343                        pci_name(host->pdev), activated);
1344
1345                 new_state = HST_PROBE_FINISHED;
1346                 reschedule = 1;
1347                 break;
1348         }
1349
1350         case HST_PROBE_FINISHED:
1351                 complete(&host->probe_comp);
1352                 break;
1353
1354         case HST_ERROR:
1355                 /* FIXME: TODO */
1356                 break;
1357
1358         default:
1359                 /* should never occur */
1360                 printk(KERN_ERR PFX "BUG: unknown state %d\n", state);
1361                 assert(0);
1362                 break;
1363         }
1364
1365         if (new_state != HST_INVALID) {
1366                 spin_lock_irqsave(&host->lock, flags);
1367                 host->state = new_state;
1368                 spin_unlock_irqrestore(&host->lock, flags);
1369         }
1370         if (reschedule)
1371                 schedule_work(&host->fsm_task);
1372 }
1373
1374 static int carm_init_wait(void __iomem *mmio, u32 bits, unsigned int test_bit)
1375 {
1376         unsigned int i;
1377
1378         for (i = 0; i < 50000; i++) {
1379                 u32 tmp = readl(mmio + CARM_LMUC);
1380                 udelay(100);
1381
1382                 if (test_bit) {
1383                         if ((tmp & bits) == bits)
1384                                 return 0;
1385                 } else {
1386                         if ((tmp & bits) == 0)
1387                                 return 0;
1388                 }
1389
1390                 cond_resched();
1391         }
1392
1393         printk(KERN_ERR PFX "carm_init_wait timeout, bits == 0x%x, test_bit == %s\n",
1394                bits, test_bit ? "yes" : "no");
1395         return -EBUSY;
1396 }
1397
1398 static void carm_init_responses(struct carm_host *host)
1399 {
1400         void __iomem *mmio = host->mmio;
1401         unsigned int i;
1402         struct carm_response *resp = (struct carm_response *) host->shm;
1403
1404         for (i = 0; i < RMSG_Q_LEN; i++)
1405                 resp[i].status = cpu_to_le32(0xffffffff);
1406
1407         writel(0, mmio + CARM_RESP_IDX);
1408 }
1409
1410 static int carm_init_host(struct carm_host *host)
1411 {
1412         void __iomem *mmio = host->mmio;
1413         u32 tmp;
1414         u8 tmp8;
1415         int rc;
1416
1417         DPRINTK("ENTER\n");
1418
1419         writel(0, mmio + CARM_INT_MASK);
1420
1421         tmp8 = readb(mmio + CARM_INITC);
1422         if (tmp8 & 0x01) {
1423                 tmp8 &= ~0x01;
1424                 writeb(tmp8, mmio + CARM_INITC);
1425                 readb(mmio + CARM_INITC);       /* flush */
1426
1427                 DPRINTK("snooze...\n");
1428                 msleep(5000);
1429         }
1430
1431         tmp = readl(mmio + CARM_HMUC);
1432         if (tmp & CARM_CME) {
1433                 DPRINTK("CME bit present, waiting\n");
1434                 rc = carm_init_wait(mmio, CARM_CME, 1);
1435                 if (rc) {
1436                         DPRINTK("EXIT, carm_init_wait 1 failed\n");
1437                         return rc;
1438                 }
1439         }
1440         if (tmp & CARM_RME) {
1441                 DPRINTK("RME bit present, waiting\n");
1442                 rc = carm_init_wait(mmio, CARM_RME, 1);
1443                 if (rc) {
1444                         DPRINTK("EXIT, carm_init_wait 2 failed\n");
1445                         return rc;
1446                 }
1447         }
1448
1449         tmp &= ~(CARM_RME | CARM_CME);
1450         writel(tmp, mmio + CARM_HMUC);
1451         readl(mmio + CARM_HMUC);        /* flush */
1452
1453         rc = carm_init_wait(mmio, CARM_RME | CARM_CME, 0);
1454         if (rc) {
1455                 DPRINTK("EXIT, carm_init_wait 3 failed\n");
1456                 return rc;
1457         }
1458
1459         carm_init_buckets(mmio);
1460
1461         writel(host->shm_dma & 0xffffffff, mmio + RBUF_ADDR_LO);
1462         writel((host->shm_dma >> 16) >> 16, mmio + RBUF_ADDR_HI);
1463         writel(RBUF_LEN, mmio + RBUF_BYTE_SZ);
1464
1465         tmp = readl(mmio + CARM_HMUC);
1466         tmp |= (CARM_RME | CARM_CME | CARM_WZBC);
1467         writel(tmp, mmio + CARM_HMUC);
1468         readl(mmio + CARM_HMUC);        /* flush */
1469
1470         rc = carm_init_wait(mmio, CARM_RME | CARM_CME, 1);
1471         if (rc) {
1472                 DPRINTK("EXIT, carm_init_wait 4 failed\n");
1473                 return rc;
1474         }
1475
1476         writel(0, mmio + CARM_HMPHA);
1477         writel(INT_DEF_MASK, mmio + CARM_INT_MASK);
1478
1479         carm_init_responses(host);
1480
1481         /* start initialization, probing state machine */
1482         spin_lock_irq(&host->lock);
1483         assert(host->state == HST_INVALID);
1484         host->state = HST_PROBE_START;
1485         spin_unlock_irq(&host->lock);
1486         schedule_work(&host->fsm_task);
1487
1488         DPRINTK("EXIT\n");
1489         return 0;
1490 }
1491
1492 static int carm_init_disks(struct carm_host *host)
1493 {
1494         unsigned int i;
1495         int rc = 0;
1496
1497         for (i = 0; i < CARM_MAX_PORTS; i++) {
1498                 struct gendisk *disk;
1499                 struct request_queue *q;
1500                 struct carm_port *port;
1501
1502                 port = &host->port[i];
1503                 port->host = host;
1504                 port->port_no = i;
1505
1506                 disk = alloc_disk(CARM_MINORS_PER_MAJOR);
1507                 if (!disk) {
1508                         rc = -ENOMEM;
1509                         break;
1510                 }
1511
1512                 port->disk = disk;
1513                 sprintf(disk->disk_name, DRV_NAME "/%u",
1514                         (unsigned int) (host->id * CARM_MAX_PORTS) + i);
1515                 disk->major = host->major;
1516                 disk->first_minor = i * CARM_MINORS_PER_MAJOR;
1517                 disk->fops = &carm_bd_ops;
1518                 disk->private_data = port;
1519
1520                 q = blk_init_queue(carm_rq_fn, &host->lock);
1521                 if (!q) {
1522                         rc = -ENOMEM;
1523                         break;
1524                 }
1525                 disk->queue = q;
1526                 blk_queue_max_hw_segments(q, CARM_MAX_REQ_SG);
1527                 blk_queue_max_phys_segments(q, CARM_MAX_REQ_SG);
1528                 blk_queue_segment_boundary(q, CARM_SG_BOUNDARY);
1529
1530                 q->queuedata = port;
1531         }
1532
1533         return rc;
1534 }
1535
1536 static void carm_free_disks(struct carm_host *host)
1537 {
1538         unsigned int i;
1539
1540         for (i = 0; i < CARM_MAX_PORTS; i++) {
1541                 struct gendisk *disk = host->port[i].disk;
1542                 if (disk) {
1543                         struct request_queue *q = disk->queue;
1544
1545                         if (disk->flags & GENHD_FL_UP)
1546                                 del_gendisk(disk);
1547                         if (q)
1548                                 blk_cleanup_queue(q);
1549                         put_disk(disk);
1550                 }
1551         }
1552 }
1553
1554 static int carm_init_shm(struct carm_host *host)
1555 {
1556         host->shm = pci_alloc_consistent(host->pdev, CARM_SHM_SIZE,
1557                                          &host->shm_dma);
1558         if (!host->shm)
1559                 return -ENOMEM;
1560
1561         host->msg_base = host->shm + RBUF_LEN;
1562         host->msg_dma = host->shm_dma + RBUF_LEN;
1563
1564         memset(host->shm, 0xff, RBUF_LEN);
1565         memset(host->msg_base, 0, PDC_SHM_SIZE - RBUF_LEN);
1566
1567         return 0;
1568 }
1569
1570 static int carm_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
1571 {
1572         static unsigned int printed_version;
1573         struct carm_host *host;
1574         unsigned int pci_dac;
1575         int rc;
1576         struct request_queue *q;
1577         unsigned int i;
1578
1579         if (!printed_version++)
1580                 printk(KERN_DEBUG DRV_NAME " version " DRV_VERSION "\n");
1581
1582         rc = pci_enable_device(pdev);
1583         if (rc)
1584                 return rc;
1585
1586         rc = pci_request_regions(pdev, DRV_NAME);
1587         if (rc)
1588                 goto err_out;
1589
1590 #ifdef IF_64BIT_DMA_IS_POSSIBLE /* grrrr... */
1591         rc = pci_set_dma_mask(pdev, DMA_64BIT_MASK);
1592         if (!rc) {
1593                 rc = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK);
1594                 if (rc) {
1595                         printk(KERN_ERR DRV_NAME "(%s): consistent DMA mask failure\n",
1596                                 pci_name(pdev));
1597                         goto err_out_regions;
1598                 }
1599                 pci_dac = 1;
1600         } else {
1601 #endif
1602                 rc = pci_set_dma_mask(pdev, DMA_32BIT_MASK);
1603                 if (rc) {
1604                         printk(KERN_ERR DRV_NAME "(%s): DMA mask failure\n",
1605                                 pci_name(pdev));
1606                         goto err_out_regions;
1607                 }
1608                 pci_dac = 0;
1609 #ifdef IF_64BIT_DMA_IS_POSSIBLE /* grrrr... */
1610         }
1611 #endif
1612
1613         host = kzalloc(sizeof(*host), GFP_KERNEL);
1614         if (!host) {
1615                 printk(KERN_ERR DRV_NAME "(%s): memory alloc failure\n",
1616                        pci_name(pdev));
1617                 rc = -ENOMEM;
1618                 goto err_out_regions;
1619         }
1620
1621         host->pdev = pdev;
1622         host->flags = pci_dac ? FL_DAC : 0;
1623         spin_lock_init(&host->lock);
1624         INIT_WORK(&host->fsm_task, carm_fsm_task);
1625         init_completion(&host->probe_comp);
1626
1627         for (i = 0; i < ARRAY_SIZE(host->req); i++)
1628                 host->req[i].tag = i;
1629
1630         host->mmio = ioremap(pci_resource_start(pdev, 0),
1631                              pci_resource_len(pdev, 0));
1632         if (!host->mmio) {
1633                 printk(KERN_ERR DRV_NAME "(%s): MMIO alloc failure\n",
1634                        pci_name(pdev));
1635                 rc = -ENOMEM;
1636                 goto err_out_kfree;
1637         }
1638
1639         rc = carm_init_shm(host);
1640         if (rc) {
1641                 printk(KERN_ERR DRV_NAME "(%s): DMA SHM alloc failure\n",
1642                        pci_name(pdev));
1643                 goto err_out_iounmap;
1644         }
1645
1646         q = blk_init_queue(carm_oob_rq_fn, &host->lock);
1647         if (!q) {
1648                 printk(KERN_ERR DRV_NAME "(%s): OOB queue alloc failure\n",
1649                        pci_name(pdev));
1650                 rc = -ENOMEM;
1651                 goto err_out_pci_free;
1652         }
1653         host->oob_q = q;
1654         q->queuedata = host;
1655
1656         /*
1657          * Figure out which major to use: 160, 161, or dynamic
1658          */
1659         if (!test_and_set_bit(0, &carm_major_alloc))
1660                 host->major = 160;
1661         else if (!test_and_set_bit(1, &carm_major_alloc))
1662                 host->major = 161;
1663         else
1664                 host->flags |= FL_DYN_MAJOR;
1665
1666         host->id = carm_host_id;
1667         sprintf(host->name, DRV_NAME "%d", carm_host_id);
1668
1669         rc = register_blkdev(host->major, host->name);
1670         if (rc < 0)
1671                 goto err_out_free_majors;
1672         if (host->flags & FL_DYN_MAJOR)
1673                 host->major = rc;
1674
1675         rc = carm_init_disks(host);
1676         if (rc)
1677                 goto err_out_blkdev_disks;
1678
1679         pci_set_master(pdev);
1680
1681         rc = request_irq(pdev->irq, carm_interrupt, IRQF_SHARED, DRV_NAME, host);
1682         if (rc) {
1683                 printk(KERN_ERR DRV_NAME "(%s): irq alloc failure\n",
1684                        pci_name(pdev));
1685                 goto err_out_blkdev_disks;
1686         }
1687
1688         rc = carm_init_host(host);
1689         if (rc)
1690                 goto err_out_free_irq;
1691
1692         DPRINTK("waiting for probe_comp\n");
1693         wait_for_completion(&host->probe_comp);
1694
1695         printk(KERN_INFO "%s: pci %s, ports %d, io %llx, irq %u, major %d\n",
1696                host->name, pci_name(pdev), (int) CARM_MAX_PORTS,
1697                (unsigned long long)pci_resource_start(pdev, 0),
1698                    pdev->irq, host->major);
1699
1700         carm_host_id++;
1701         pci_set_drvdata(pdev, host);
1702         return 0;
1703
1704 err_out_free_irq:
1705         free_irq(pdev->irq, host);
1706 err_out_blkdev_disks:
1707         carm_free_disks(host);
1708         unregister_blkdev(host->major, host->name);
1709 err_out_free_majors:
1710         if (host->major == 160)
1711                 clear_bit(0, &carm_major_alloc);
1712         else if (host->major == 161)
1713                 clear_bit(1, &carm_major_alloc);
1714         blk_cleanup_queue(host->oob_q);
1715 err_out_pci_free:
1716         pci_free_consistent(pdev, CARM_SHM_SIZE, host->shm, host->shm_dma);
1717 err_out_iounmap:
1718         iounmap(host->mmio);
1719 err_out_kfree:
1720         kfree(host);
1721 err_out_regions:
1722         pci_release_regions(pdev);
1723 err_out:
1724         pci_disable_device(pdev);
1725         return rc;
1726 }
1727
1728 static void carm_remove_one (struct pci_dev *pdev)
1729 {
1730         struct carm_host *host = pci_get_drvdata(pdev);
1731
1732         if (!host) {
1733                 printk(KERN_ERR PFX "BUG: no host data for PCI(%s)\n",
1734                        pci_name(pdev));
1735                 return;
1736         }
1737
1738         free_irq(pdev->irq, host);
1739         carm_free_disks(host);
1740         unregister_blkdev(host->major, host->name);
1741         if (host->major == 160)
1742                 clear_bit(0, &carm_major_alloc);
1743         else if (host->major == 161)
1744                 clear_bit(1, &carm_major_alloc);
1745         blk_cleanup_queue(host->oob_q);
1746         pci_free_consistent(pdev, CARM_SHM_SIZE, host->shm, host->shm_dma);
1747         iounmap(host->mmio);
1748         kfree(host);
1749         pci_release_regions(pdev);
1750         pci_disable_device(pdev);
1751         pci_set_drvdata(pdev, NULL);
1752 }
1753
1754 static int __init carm_init(void)
1755 {
1756         return pci_register_driver(&carm_driver);
1757 }
1758
1759 static void __exit carm_exit(void)
1760 {
1761         pci_unregister_driver(&carm_driver);
1762 }
1763
1764 module_init(carm_init);
1765 module_exit(carm_exit);
1766
1767