drivers/scsi/wd719x.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Driver for Western Digital WD7193, WD7197 and WD7296 SCSI cards
   4  * Copyright 2013 Ondrej Zary
   5  *
   6  * Original driver by
   7  * Aaron Dewell <dewell@woods.net>
   8  * Gaerti <Juergen.Gaertner@mbox.si.uni-hannover.de>
   9  *
  10  * HW documentation available in book:
  11  *
  12  * SPIDER Command Protocol
  13  * by Chandru M. Sippy
  14  * SCSI Storage Products (MCP)
  15  * Western Digital Corporation
  16  * 09-15-95
  17  *
  18  * http://web.archive.org/web/20070717175254/http://sun1.rrzn.uni-hannover.de/gaertner.juergen/wd719x/Linux/Docu/Spider/
  19  */
  20
  21 /*
  22  * Driver workflow:
  23  * 1. SCSI command is transformed to SCB (Spider Control Block) by the
  24  *    queuecommand function.
  25  * 2. The address of the SCB is stored in a list to be able to access it, if
  26  *    something goes wrong.
  27  * 3. The address of the SCB is written to the Controller, which loads the SCB
  28  *    via BM-DMA and processes it.
  29  * 4. After it has finished, it generates an interrupt, and sets registers.
  30  *
  31  * flaws:
  32  *  - abort/reset functions
  33  *
  34  * ToDo:
  35  *  - tagged queueing
  36  */
  37
  38 #include <linux/interrupt.h>
  39 #include <linux/module.h>
  40 #include <linux/delay.h>
  41 #include <linux/pci.h>
  42 #include <linux/firmware.h>
  43 #include <linux/eeprom_93cx6.h>
  44 #include <scsi/scsi_cmnd.h>
  45 #include <scsi/scsi_device.h>
  46 #include <scsi/scsi_host.h>
  47 #include "wd719x.h"
  48
  49 /* low-level register access */
  50 static inline u8 wd719x_readb(struct wd719x *wd, u8 reg)
  51 {
  52         return ioread8(wd->base + reg);
  53 }
  54
  55 static inline u32 wd719x_readl(struct wd719x *wd, u8 reg)
  56 {
  57         return ioread32(wd->base + reg);
  58 }
  59
  60 static inline void wd719x_writeb(struct wd719x *wd, u8 reg, u8 val)
  61 {
  62         iowrite8(val, wd->base + reg);
  63 }
  64
  65 static inline void wd719x_writew(struct wd719x *wd, u8 reg, u16 val)
  66 {
  67         iowrite16(val, wd->base + reg);
  68 }
  69
  70 static inline void wd719x_writel(struct wd719x *wd, u8 reg, u32 val)
  71 {
  72         iowrite32(val, wd->base + reg);
  73 }
  74
  75 /* wait until the command register is ready */
  76 static inline int wd719x_wait_ready(struct wd719x *wd)
  77 {
  78         int i = 0;
  79
  80         do {
  81                 if (wd719x_readb(wd, WD719X_AMR_COMMAND) == WD719X_CMD_READY)
  82                         return 0;
  83                 udelay(1);
  84         } while (i++ < WD719X_WAIT_FOR_CMD_READY);
  85
  86         dev_err(&wd->pdev->dev, "command register is not ready: 0x%02x\n",
  87                 wd719x_readb(wd, WD719X_AMR_COMMAND));
  88
  89         return -ETIMEDOUT;
  90 }
  91
  92 /* poll interrupt status register until command finishes */
  93 static inline int wd719x_wait_done(struct wd719x *wd, int timeout)
  94 {
  95         u8 status;
  96
  97         while (timeout > 0) {
  98                 status = wd719x_readb(wd, WD719X_AMR_INT_STATUS);
  99                 if (status)
 100                         break;
 101                 timeout--;
 102                 udelay(1);
 103         }
 104
 105         if (timeout <= 0) {
 106                 dev_err(&wd->pdev->dev, "direct command timed out\n");
 107                 return -ETIMEDOUT;
 108         }
 109
 110         if (status != WD719X_INT_NOERRORS) {
 111                 u8 sue = wd719x_readb(wd, WD719X_AMR_SCB_ERROR);
 112                 /* we get this after wd719x_dev_reset, it's not an error */
 113                 if (sue == WD719X_SUE_TERM)
 114                         return 0;
 115                 /* we get this after wd719x_bus_reset, it's not an error */
 116                 if (sue == WD719X_SUE_RESET)
 117                         return 0;
 118                 dev_err(&wd->pdev->dev, "direct command failed, status 0x%02x, SUE 0x%02x\n",
 119                         status, sue);
 120                 return -EIO;
 121         }
 122
 123         return 0;
 124 }
 125
 126 static int wd719x_direct_cmd(struct wd719x *wd, u8 opcode, u8 dev, u8 lun,
 127                              u8 tag, dma_addr_t data, int timeout)
 128 {
 129         int ret = 0;
 130
 131         /* clear interrupt status register (allow command register to clear) */
 132         wd719x_writeb(wd, WD719X_AMR_INT_STATUS, WD719X_INT_NONE);
 133
 134         /* Wait for the Command register to become free */
 135         if (wd719x_wait_ready(wd))
 136                 return -ETIMEDOUT;
 137
 138         /* disable interrupts except for RESET/ABORT (it breaks them) */
 139         if (opcode != WD719X_CMD_BUSRESET && opcode != WD719X_CMD_ABORT &&
 140             opcode != WD719X_CMD_ABORT_TAG && opcode != WD719X_CMD_RESET)
 141                 dev |= WD719X_DISABLE_INT;
 142         wd719x_writeb(wd, WD719X_AMR_CMD_PARAM, dev);
 143         wd719x_writeb(wd, WD719X_AMR_CMD_PARAM_2, lun);
 144         wd719x_writeb(wd, WD719X_AMR_CMD_PARAM_3, tag);
 145         if (data)
 146                 wd719x_writel(wd, WD719X_AMR_SCB_IN, data);
 147
 148         /* clear interrupt status register again */
 149         wd719x_writeb(wd, WD719X_AMR_INT_STATUS, WD719X_INT_NONE);
 150
 151         /* Now, write the command */
 152         wd719x_writeb(wd, WD719X_AMR_COMMAND, opcode);
 153
 154         if (timeout)    /* wait for the command to complete */
 155                 ret = wd719x_wait_done(wd, timeout);
 156
 157         /* clear interrupt status register (clean up) */
 158         if (opcode != WD719X_CMD_READ_FIRMVER)
 159                 wd719x_writeb(wd, WD719X_AMR_INT_STATUS, WD719X_INT_NONE);
 160
 161         return ret;
 162 }
 163
 164 static void wd719x_destroy(struct wd719x *wd)
 165 {
 166         /* stop the RISC */
 167         if (wd719x_direct_cmd(wd, WD719X_CMD_SLEEP, 0, 0, 0, 0,
 168                               WD719X_WAIT_FOR_RISC))
 169                 dev_warn(&wd->pdev->dev, "RISC sleep command failed\n");
 170         /* disable RISC */
 171         wd719x_writeb(wd, WD719X_PCI_MODE_SELECT, 0);
 172
 173         WARN_ON_ONCE(!list_empty(&wd->active_scbs));
 174
 175         /* free internal buffers */
 176         dma_free_coherent(&wd->pdev->dev, wd->fw_size, wd->fw_virt,
 177                           wd->fw_phys);
 178         wd->fw_virt = NULL;
 179         dma_free_coherent(&wd->pdev->dev, WD719X_HASH_TABLE_SIZE, wd->hash_virt,
 180                           wd->hash_phys);
 181         wd->hash_virt = NULL;
 182         dma_free_coherent(&wd->pdev->dev, sizeof(struct wd719x_host_param),
 183                           wd->params, wd->params_phys);
 184         wd->params = NULL;
 185         free_irq(wd->pdev->irq, wd);
 186 }
 187
 188 /* finish a SCSI command, unmap buffers */
 189 static void wd719x_finish_cmd(struct wd719x_scb *scb, int result)
 190 {
 191         struct scsi_cmnd *cmd = scb->cmd;
 192         struct wd719x *wd = shost_priv(cmd->device->host);
 193
 194         list_del(&scb->list);
 195
 196         dma_unmap_single(&wd->pdev->dev, scb->phys,
 197                         sizeof(struct wd719x_scb), DMA_BIDIRECTIONAL);
 198         scsi_dma_unmap(cmd);
 199         dma_unmap_single(&wd->pdev->dev, cmd->SCp.dma_handle,
 200                          SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
 201
 202         cmd->result = result << 16;
 203         cmd->scsi_done(cmd);
 204 }
 205
 206 /* Build a SCB and send it to the card */
 207 static int wd719x_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *cmd)
 208 {
 209         int i, count_sg;
 210         unsigned long flags;
 211         struct wd719x_scb *scb = scsi_cmd_priv(cmd);
 212         struct wd719x *wd = shost_priv(sh);
 213
 214         scb->cmd = cmd;
 215
 216         scb->CDB_tag = 0;       /* Tagged queueing not supported yet */
 217         scb->devid = cmd->device->id;
 218         scb->lun = cmd->device->lun;
 219
 220         /* copy the command */
 221         memcpy(scb->CDB, cmd->cmnd, cmd->cmd_len);
 222
 223         /* map SCB */
 224         scb->phys = dma_map_single(&wd->pdev->dev, scb, sizeof(*scb),
 225                                    DMA_BIDIRECTIONAL);
 226
 227         if (dma_mapping_error(&wd->pdev->dev, scb->phys))
 228                 goto out_error;
 229
 230         /* map sense buffer */
 231         scb->sense_buf_length = SCSI_SENSE_BUFFERSIZE;
 232         cmd->SCp.dma_handle = dma_map_single(&wd->pdev->dev, cmd->sense_buffer,
 233                         SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
 234         if (dma_mapping_error(&wd->pdev->dev, cmd->SCp.dma_handle))
 235                 goto out_unmap_scb;
 236         scb->sense_buf = cpu_to_le32(cmd->SCp.dma_handle);
 237
 238         /* request autosense */
 239         scb->SCB_options |= WD719X_SCB_FLAGS_AUTO_REQUEST_SENSE;
 240
 241         /* check direction */
 242         if (cmd->sc_data_direction == DMA_TO_DEVICE)
 243                 scb->SCB_options |= WD719X_SCB_FLAGS_CHECK_DIRECTION
 244                                  |  WD719X_SCB_FLAGS_PCI_TO_SCSI;
 245         else if (cmd->sc_data_direction == DMA_FROM_DEVICE)
 246                 scb->SCB_options |= WD719X_SCB_FLAGS_CHECK_DIRECTION;
 247
 248         /* Scather/gather */
 249         count_sg = scsi_dma_map(cmd);
 250         if (count_sg < 0)
 251                 goto out_unmap_sense;
 252         BUG_ON(count_sg > WD719X_SG);
 253
 254         if (count_sg) {
 255                 struct scatterlist *sg;
 256
 257                 scb->data_length = cpu_to_le32(count_sg *
 258                                                sizeof(struct wd719x_sglist));
 259                 scb->data_p = cpu_to_le32(scb->phys +
 260                                           offsetof(struct wd719x_scb, sg_list));
 261
 262                 scsi_for_each_sg(cmd, sg, count_sg, i) {
 263                         scb->sg_list[i].ptr = cpu_to_le32(sg_dma_address(sg));
 264                         scb->sg_list[i].length = cpu_to_le32(sg_dma_len(sg));
 265                 }
 266                 scb->SCB_options |= WD719X_SCB_FLAGS_DO_SCATTER_GATHER;
 267         } else { /* zero length */
 268                 scb->data_length = 0;
 269                 scb->data_p = 0;
 270         }
 271
 272         spin_lock_irqsave(wd->sh->host_lock, flags);
 273
 274         /* check if the Command register is free */
 275         if (wd719x_readb(wd, WD719X_AMR_COMMAND) != WD719X_CMD_READY) {
 276                 spin_unlock_irqrestore(wd->sh->host_lock, flags);
 277                 return SCSI_MLQUEUE_HOST_BUSY;
 278         }
 279
 280         list_add(&scb->list, &wd->active_scbs);
 281
 282         /* write pointer to the AMR */
 283         wd719x_writel(wd, WD719X_AMR_SCB_IN, scb->phys);
 284         /* send SCB opcode */
 285         wd719x_writeb(wd, WD719X_AMR_COMMAND, WD719X_CMD_PROCESS_SCB);
 286
 287         spin_unlock_irqrestore(wd->sh->host_lock, flags);
 288         return 0;
 289
 290 out_unmap_sense:
 291         dma_unmap_single(&wd->pdev->dev, cmd->SCp.dma_handle,
 292                          SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
 293 out_unmap_scb:
 294         dma_unmap_single(&wd->pdev->dev, scb->phys, sizeof(*scb),
 295                          DMA_BIDIRECTIONAL);
 296 out_error:
 297         cmd->result = DID_ERROR << 16;
 298         cmd->scsi_done(cmd);
 299         return 0;
 300 }
 301
 302 static int wd719x_chip_init(struct wd719x *wd)
 303 {
 304         int i, ret;
 305         u32 risc_init[3];
 306         const struct firmware *fw_wcs, *fw_risc;
 307         const char fwname_wcs[] = "wd719x-wcs.bin";
 308         const char fwname_risc[] = "wd719x-risc.bin";
 309
 310         memset(wd->hash_virt, 0, WD719X_HASH_TABLE_SIZE);
 311
 312         /* WCS (sequencer) firmware */
 313         ret = request_firmware(&fw_wcs, fwname_wcs, &wd->pdev->dev);
 314         if (ret) {
 315                 dev_err(&wd->pdev->dev, "Unable to load firmware %s: %d\n",
 316                         fwname_wcs, ret);
 317                 return ret;
 318         }
 319         /* RISC firmware */
 320         ret = request_firmware(&fw_risc, fwname_risc, &wd->pdev->dev);
 321         if (ret) {
 322                 dev_err(&wd->pdev->dev, "Unable to load firmware %s: %d\n",
 323                         fwname_risc, ret);
 324                 release_firmware(fw_wcs);
 325                 return ret;
 326         }
 327         wd->fw_size = ALIGN(fw_wcs->size, 4) + fw_risc->size;
 328
 329         if (!wd->fw_virt)
 330                 wd->fw_virt = dma_alloc_coherent(&wd->pdev->dev, wd->fw_size,
 331                                                  &wd->fw_phys, GFP_KERNEL);
 332         if (!wd->fw_virt) {
 333                 ret = -ENOMEM;
 334                 goto wd719x_init_end;
 335         }
 336
 337         /* make a fresh copy of WCS and RISC code */
 338         memcpy(wd->fw_virt, fw_wcs->data, fw_wcs->size);
 339         memcpy(wd->fw_virt + ALIGN(fw_wcs->size, 4), fw_risc->data,
 340                 fw_risc->size);
 341
 342         /* Reset the Spider Chip and adapter itself */
 343         wd719x_writeb(wd, WD719X_PCI_PORT_RESET, WD719X_PCI_RESET);
 344         udelay(WD719X_WAIT_FOR_RISC);
 345         /* Clear PIO mode bits set by BIOS */
 346         wd719x_writeb(wd, WD719X_AMR_CMD_PARAM, 0);
 347         /* ensure RISC is not running */
 348         wd719x_writeb(wd, WD719X_PCI_MODE_SELECT, 0);
 349         /* ensure command port is ready */
 350         wd719x_writeb(wd, WD719X_AMR_COMMAND, 0);
 351         if (wd719x_wait_ready(wd)) {
 352                 ret = -ETIMEDOUT;
 353                 goto wd719x_init_end;
 354         }
 355
 356         /* Transfer the first 2K words of RISC code to kick start the uP */
 357         risc_init[0] = wd->fw_phys;                             /* WCS FW */
 358         risc_init[1] = wd->fw_phys + ALIGN(fw_wcs->size, 4);    /* RISC FW */
 359         risc_init[2] = wd->hash_phys;                           /* hash table */
 360
 361         /* clear DMA status */
 362         wd719x_writeb(wd, WD719X_PCI_CHANNEL2_3STATUS, 0);
 363
 364         /* address to read firmware from */
 365         wd719x_writel(wd, WD719X_PCI_EXTERNAL_ADDR, risc_init[1]);
 366         /* base address to write firmware to (on card) */
 367         wd719x_writew(wd, WD719X_PCI_INTERNAL_ADDR, WD719X_PRAM_BASE_ADDR);
 368         /* size: first 2K words */
 369         wd719x_writew(wd, WD719X_PCI_DMA_TRANSFER_SIZE, 2048 * 2);
 370         /* start DMA */
 371         wd719x_writeb(wd, WD719X_PCI_CHANNEL2_3CMD, WD719X_START_CHANNEL2_3DMA);
 372
 373         /* wait for DMA to complete */
 374         i = WD719X_WAIT_FOR_RISC;
 375         while (i-- > 0) {
 376                 u8 status = wd719x_readb(wd, WD719X_PCI_CHANNEL2_3STATUS);
 377                 if (status == WD719X_START_CHANNEL2_3DONE)
 378                         break;
 379                 if (status == WD719X_START_CHANNEL2_3ABORT) {
 380                         dev_warn(&wd->pdev->dev, "RISC bootstrap failed: DMA aborted\n");
 381                         ret = -EIO;
 382                         goto wd719x_init_end;
 383                 }
 384                 udelay(1);
 385         }
 386         if (i < 1) {
 387                 dev_warn(&wd->pdev->dev, "RISC bootstrap failed: DMA timeout\n");
 388                 ret = -ETIMEDOUT;
 389                 goto wd719x_init_end;
 390         }
 391
 392         /* firmware is loaded, now initialize and wake up the RISC */
 393         /* write RISC initialization long words to Spider */
 394         wd719x_writel(wd, WD719X_AMR_SCB_IN, risc_init[0]);
 395         wd719x_writel(wd, WD719X_AMR_SCB_IN + 4, risc_init[1]);
 396         wd719x_writel(wd, WD719X_AMR_SCB_IN + 8, risc_init[2]);
 397
 398         /* disable interrupts during initialization of RISC */
 399         wd719x_writeb(wd, WD719X_AMR_CMD_PARAM, WD719X_DISABLE_INT);
 400
 401         /* issue INITIALIZE RISC comand */
 402         wd719x_writeb(wd, WD719X_AMR_COMMAND, WD719X_CMD_INIT_RISC);
 403         /* enable advanced mode (wake up RISC) */
 404         wd719x_writeb(wd, WD719X_PCI_MODE_SELECT, WD719X_ENABLE_ADVANCE_MODE);
 405         udelay(WD719X_WAIT_FOR_RISC);
 406
 407         ret = wd719x_wait_done(wd, WD719X_WAIT_FOR_RISC);
 408         /* clear interrupt status register */
 409         wd719x_writeb(wd, WD719X_AMR_INT_STATUS, WD719X_INT_NONE);
 410         if (ret) {
 411                 dev_warn(&wd->pdev->dev, "Unable to initialize RISC\n");
 412                 goto wd719x_init_end;
 413         }
 414         /* RISC is up and running */
 415
 416         /* Read FW version from RISC */
 417         ret = wd719x_direct_cmd(wd, WD719X_CMD_READ_FIRMVER, 0, 0, 0, 0,
 418                                 WD719X_WAIT_FOR_RISC);
 419         if (ret) {
 420                 dev_warn(&wd->pdev->dev, "Unable to read firmware version\n");
 421                 goto wd719x_init_end;
 422         }
 423         dev_info(&wd->pdev->dev, "RISC initialized with firmware version %.2x.%.2x\n",
 424                         wd719x_readb(wd, WD719X_AMR_SCB_OUT + 1),
 425                         wd719x_readb(wd, WD719X_AMR_SCB_OUT));
 426
 427         /* RESET SCSI bus */
 428         ret = wd719x_direct_cmd(wd, WD719X_CMD_BUSRESET, 0, 0, 0, 0,
 429                                 WD719X_WAIT_FOR_SCSI_RESET);
 430         if (ret) {
 431                 dev_warn(&wd->pdev->dev, "SCSI bus reset failed\n");
 432                 goto wd719x_init_end;
 433         }
 434
 435         /* use HostParameter structure to set Spider's Host Parameter Block */
 436         ret = wd719x_direct_cmd(wd, WD719X_CMD_SET_PARAM, 0,
 437                                 sizeof(struct wd719x_host_param), 0,
 438                                 wd->params_phys, WD719X_WAIT_FOR_RISC);
 439         if (ret) {
 440                 dev_warn(&wd->pdev->dev, "Failed to set HOST PARAMETERS\n");
 441                 goto wd719x_init_end;
 442         }
 443
 444         /* initiate SCAM (does nothing if disabled in BIOS) */
 445         /* bug?: we should pass a mask of static IDs which we don't have */
 446         ret = wd719x_direct_cmd(wd, WD719X_CMD_INIT_SCAM, 0, 0, 0, 0,
 447                                 WD719X_WAIT_FOR_SCSI_RESET);
 448         if (ret) {
 449                 dev_warn(&wd->pdev->dev, "SCAM initialization failed\n");
 450                 goto wd719x_init_end;
 451         }
 452
 453         /* clear AMR_BIOS_SHARE_INT register */
 454         wd719x_writeb(wd, WD719X_AMR_BIOS_SHARE_INT, 0);
 455
 456 wd719x_init_end:
 457         release_firmware(fw_wcs);
 458         release_firmware(fw_risc);
 459
 460         return ret;
 461 }
 462
 463 static int wd719x_abort(struct scsi_cmnd *cmd)
 464 {
 465         int action, result;
 466         unsigned long flags;
 467         struct wd719x_scb *scb = scsi_cmd_priv(cmd);
 468         struct wd719x *wd = shost_priv(cmd->device->host);
 469
 470         dev_info(&wd->pdev->dev, "abort command, tag: %x\n", cmd->tag);
 471
 472         action = /*cmd->tag ? WD719X_CMD_ABORT_TAG : */WD719X_CMD_ABORT;
 473
 474         spin_lock_irqsave(wd->sh->host_lock, flags);
 475         result = wd719x_direct_cmd(wd, action, cmd->device->id,
 476                                    cmd->device->lun, cmd->tag, scb->phys, 0);
 477         wd719x_finish_cmd(scb, DID_ABORT);
 478         spin_unlock_irqrestore(wd->sh->host_lock, flags);
 479         if (result)
 480                 return FAILED;
 481
 482         return SUCCESS;
 483 }
 484
 485 static int wd719x_reset(struct scsi_cmnd *cmd, u8 opcode, u8 device)
 486 {
 487         int result;
 488         unsigned long flags;
 489         struct wd719x *wd = shost_priv(cmd->device->host);
 490         struct wd719x_scb *scb, *tmp;
 491
 492         dev_info(&wd->pdev->dev, "%s reset requested\n",
 493                  (opcode == WD719X_CMD_BUSRESET) ? "bus" : "device");
 494
 495         spin_lock_irqsave(wd->sh->host_lock, flags);
 496         result = wd719x_direct_cmd(wd, opcode, device, 0, 0, 0,
 497                                    WD719X_WAIT_FOR_SCSI_RESET);
 498         /* flush all SCBs (or all for a device if dev_reset) */
 499         list_for_each_entry_safe(scb, tmp, &wd->active_scbs, list) {
 500                 if (opcode == WD719X_CMD_BUSRESET ||
 501                     scb->cmd->device->id == device)
 502                         wd719x_finish_cmd(scb, DID_RESET);
 503         }
 504         spin_unlock_irqrestore(wd->sh->host_lock, flags);
 505         if (result)
 506                 return FAILED;
 507
 508         return SUCCESS;
 509 }
 510
 511 static int wd719x_dev_reset(struct scsi_cmnd *cmd)
 512 {
 513         return wd719x_reset(cmd, WD719X_CMD_RESET, cmd->device->id);
 514 }
 515
 516 static int wd719x_bus_reset(struct scsi_cmnd *cmd)
 517 {
 518         return wd719x_reset(cmd, WD719X_CMD_BUSRESET, 0);
 519 }
 520
 521 static int wd719x_host_reset(struct scsi_cmnd *cmd)
 522 {
 523         struct wd719x *wd = shost_priv(cmd->device->host);
 524         struct wd719x_scb *scb, *tmp;
 525         unsigned long flags;
 526
 527         dev_info(&wd->pdev->dev, "host reset requested\n");
 528         spin_lock_irqsave(wd->sh->host_lock, flags);
 529         /* stop the RISC */
 530         if (wd719x_direct_cmd(wd, WD719X_CMD_SLEEP, 0, 0, 0, 0,
 531                               WD719X_WAIT_FOR_RISC))
 532                 dev_warn(&wd->pdev->dev, "RISC sleep command failed\n");
 533         /* disable RISC */
 534         wd719x_writeb(wd, WD719X_PCI_MODE_SELECT, 0);
 535
 536         /* flush all SCBs */
 537         list_for_each_entry_safe(scb, tmp, &wd->active_scbs, list)
 538                 wd719x_finish_cmd(scb, DID_RESET);
 539         spin_unlock_irqrestore(wd->sh->host_lock, flags);
 540
 541         /* Try to reinit the RISC */
 542         return wd719x_chip_init(wd) == 0 ? SUCCESS : FAILED;
 543 }
 544
 545 static int wd719x_biosparam(struct scsi_device *sdev, struct block_device *bdev,
 546                             sector_t capacity, int geom[])
 547 {
 548         if (capacity >= 0x200000) {
 549                 geom[0] = 255;  /* heads */
 550                 geom[1] = 63;   /* sectors */
 551         } else {
 552                 geom[0] = 64;   /* heads */
 553                 geom[1] = 32;   /* sectors */
 554         }
 555         geom[2] = sector_div(capacity, geom[0] * geom[1]);      /* cylinders */
 556
 557         return 0;
 558 }
 559
 560 /* process a SCB-completion interrupt */
 561 static inline void wd719x_interrupt_SCB(struct wd719x *wd,
 562                                         union wd719x_regs regs,
 563                                         struct wd719x_scb *scb)
 564 {
 565         int result;
 566
 567         /* now have to find result from card */
 568         switch (regs.bytes.SUE) {
 569         case WD719X_SUE_NOERRORS:
 570                 result = DID_OK;
 571                 break;
 572         case WD719X_SUE_REJECTED:
 573                 dev_err(&wd->pdev->dev, "command rejected\n");
 574                 result = DID_ERROR;
 575                 break;
 576         case WD719X_SUE_SCBQFULL:
 577                 dev_err(&wd->pdev->dev, "SCB queue is full\n");
 578                 result = DID_ERROR;
 579                 break;
 580         case WD719X_SUE_TERM:
 581                 dev_dbg(&wd->pdev->dev, "SCB terminated by direct command\n");
 582                 result = DID_ABORT;     /* or DID_RESET? */
 583                 break;
 584         case WD719X_SUE_CHAN1ABORT:
 585         case WD719X_SUE_CHAN23ABORT:
 586                 result = DID_ABORT;
 587                 dev_err(&wd->pdev->dev, "DMA abort\n");
 588                 break;
 589         case WD719X_SUE_CHAN1PAR:
 590         case WD719X_SUE_CHAN23PAR:
 591                 result = DID_PARITY;
 592                 dev_err(&wd->pdev->dev, "DMA parity error\n");
 593                 break;
 594         case WD719X_SUE_TIMEOUT:
 595                 result = DID_TIME_OUT;
 596                 dev_dbg(&wd->pdev->dev, "selection timeout\n");
 597                 break;
 598         case WD719X_SUE_RESET:
 599                 dev_dbg(&wd->pdev->dev, "bus reset occurred\n");
 600                 result = DID_RESET;
 601                 break;
 602         case WD719X_SUE_BUSERROR:
 603                 dev_dbg(&wd->pdev->dev, "SCSI bus error\n");
 604                 result = DID_ERROR;
 605                 break;
 606         case WD719X_SUE_WRONGWAY:
 607                 dev_err(&wd->pdev->dev, "wrong data transfer direction\n");
 608                 result = DID_ERROR;
 609                 break;
 610         case WD719X_SUE_BADPHASE:
 611                 dev_err(&wd->pdev->dev, "invalid SCSI phase\n");
 612                 result = DID_ERROR;
 613                 break;
 614         case WD719X_SUE_TOOLONG:
 615                 dev_err(&wd->pdev->dev, "record too long\n");
 616                 result = DID_ERROR;
 617                 break;
 618         case WD719X_SUE_BUSFREE:
 619                 dev_err(&wd->pdev->dev, "unexpected bus free\n");
 620                 result = DID_NO_CONNECT; /* or DID_ERROR ???*/
 621                 break;
 622         case WD719X_SUE_ARSDONE:
 623                 dev_dbg(&wd->pdev->dev, "auto request sense\n");
 624                 if (regs.bytes.SCSI == 0)
 625                         result = DID_OK;
 626                 else
 627                         result = DID_PARITY;
 628                 break;
 629         case WD719X_SUE_IGNORED:
 630                 dev_err(&wd->pdev->dev, "target id %d ignored command\n",
 631                         scb->cmd->device->id);
 632                 result = DID_NO_CONNECT;
 633                 break;
 634         case WD719X_SUE_WRONGTAGS:
 635                 dev_err(&wd->pdev->dev, "reversed tags\n");
 636                 result = DID_ERROR;
 637                 break;
 638         case WD719X_SUE_BADTAGS:
 639                 dev_err(&wd->pdev->dev, "tag type not supported by target\n");
 640                 result = DID_ERROR;
 641                 break;
 642         case WD719X_SUE_NOSCAMID:
 643                 dev_err(&wd->pdev->dev, "no SCAM soft ID available\n");
 644                 result = DID_ERROR;
 645                 break;
 646         default:
 647                 dev_warn(&wd->pdev->dev, "unknown SUE error code: 0x%x\n",
 648                          regs.bytes.SUE);
 649                 result = DID_ERROR;
 650                 break;
 651         }
 652
 653         wd719x_finish_cmd(scb, result);
 654 }
 655
 656 static irqreturn_t wd719x_interrupt(int irq, void *dev_id)
 657 {
 658         struct wd719x *wd = dev_id;
 659         union wd719x_regs regs;
 660         unsigned long flags;
 661         u32 SCB_out;
 662
 663         spin_lock_irqsave(wd->sh->host_lock, flags);
 664         /* read SCB pointer back from card */
 665         SCB_out = wd719x_readl(wd, WD719X_AMR_SCB_OUT);
 666         /* read all status info at once */
 667         regs.all = cpu_to_le32(wd719x_readl(wd, WD719X_AMR_OP_CODE));
 668
 669         switch (regs.bytes.INT) {
 670         case WD719X_INT_NONE:
 671                 spin_unlock_irqrestore(wd->sh->host_lock, flags);
 672                 return IRQ_NONE;
 673         case WD719X_INT_LINKNOSTATUS:
 674                 dev_err(&wd->pdev->dev, "linked command completed with no status\n");
 675                 break;
 676         case WD719X_INT_BADINT:
 677                 dev_err(&wd->pdev->dev, "unsolicited interrupt\n");
 678                 break;
 679         case WD719X_INT_NOERRORS:
 680         case WD719X_INT_LINKNOERRORS:
 681         case WD719X_INT_ERRORSLOGGED:
 682         case WD719X_INT_SPIDERFAILED:
 683                 /* was the cmd completed a direct or SCB command? */
 684                 if (regs.bytes.OPC == WD719X_CMD_PROCESS_SCB) {
 685                         struct wd719x_scb *scb;
 686                         list_for_each_entry(scb, &wd->active_scbs, list)
 687                                 if (SCB_out == scb->phys)
 688                                         break;
 689                         if (SCB_out == scb->phys)
 690                                 wd719x_interrupt_SCB(wd, regs, scb);
 691                         else
 692                                 dev_err(&wd->pdev->dev, "card returned invalid SCB pointer\n");
 693                 } else
 694                         dev_dbg(&wd->pdev->dev, "direct command 0x%x completed\n",
 695                                  regs.bytes.OPC);
 696                 break;
 697         case WD719X_INT_PIOREADY:
 698                 dev_err(&wd->pdev->dev, "card indicates PIO data ready but we never use PIO\n");
 699                 /* interrupt will not be cleared until all data is read */
 700                 break;
 701         default:
 702                 dev_err(&wd->pdev->dev, "unknown interrupt reason: %d\n",
 703                         regs.bytes.INT);
 704
 705         }
 706         /* clear interrupt so another can happen */
 707         wd719x_writeb(wd, WD719X_AMR_INT_STATUS, WD719X_INT_NONE);
 708         spin_unlock_irqrestore(wd->sh->host_lock, flags);
 709
 710         return IRQ_HANDLED;
 711 }
 712
 713 static void wd719x_eeprom_reg_read(struct eeprom_93cx6 *eeprom)
 714 {
 715         struct wd719x *wd = eeprom->data;
 716         u8 reg = wd719x_readb(wd, WD719X_PCI_GPIO_DATA);
 717
 718         eeprom->reg_data_out = reg & WD719X_EE_DO;
 719 }
 720
 721 static void wd719x_eeprom_reg_write(struct eeprom_93cx6 *eeprom)
 722 {
 723         struct wd719x *wd = eeprom->data;
 724         u8 reg = 0;
 725
 726         if (eeprom->reg_data_in)
 727                 reg |= WD719X_EE_DI;
 728         if (eeprom->reg_data_clock)
 729                 reg |= WD719X_EE_CLK;
 730         if (eeprom->reg_chip_select)
 731                 reg |= WD719X_EE_CS;
 732
 733         wd719x_writeb(wd, WD719X_PCI_GPIO_DATA, reg);
 734 }
 735
 736 /* read config from EEPROM so it can be downloaded by the RISC on (re-)init */
 737 static void wd719x_read_eeprom(struct wd719x *wd)
 738 {
 739         struct eeprom_93cx6 eeprom;
 740         u8 gpio;
 741         struct wd719x_eeprom_header header;
 742
 743         eeprom.data = wd;
 744         eeprom.register_read = wd719x_eeprom_reg_read;
 745         eeprom.register_write = wd719x_eeprom_reg_write;
 746         eeprom.width = PCI_EEPROM_WIDTH_93C46;
 747
 748         /* set all outputs to low */
 749         wd719x_writeb(wd, WD719X_PCI_GPIO_DATA, 0);
 750         /* configure GPIO pins */
 751         gpio = wd719x_readb(wd, WD719X_PCI_GPIO_CONTROL);
 752         /* GPIO outputs */
 753         gpio &= (~(WD719X_EE_CLK | WD719X_EE_DI | WD719X_EE_CS));
 754         /* GPIO input */
 755         gpio |= WD719X_EE_DO;
 756         wd719x_writeb(wd, WD719X_PCI_GPIO_CONTROL, gpio);
 757
 758         /* read EEPROM header */
 759         eeprom_93cx6_multireadb(&eeprom, 0, (u8 *)&header, sizeof(header));
 760
 761         if (header.sig1 == 'W' && header.sig2 == 'D')
 762                 eeprom_93cx6_multireadb(&eeprom, header.cfg_offset,
 763                                         (u8 *)wd->params,
 764                                         sizeof(struct wd719x_host_param));
 765         else { /* default EEPROM values */
 766                 dev_warn(&wd->pdev->dev, "EEPROM signature is invalid (0x%02x 0x%02x), using default values\n",
 767                          header.sig1, header.sig2);
 768                 wd->params->ch_1_th     = 0x10; /* 16 DWs = 64 B */
 769                 wd->params->scsi_conf   = 0x4c; /* 48ma, spue, parity check */
 770                 wd->params->own_scsi_id = 0x07; /* ID 7, SCAM disabled */
 771                 wd->params->sel_timeout = 0x4d; /* 250 ms */
 772                 wd->params->sleep_timer = 0x01;
 773                 wd->params->cdb_size    = cpu_to_le16(0x5555);  /* all 6 B */
 774                 wd->params->scsi_pad    = 0x1b;
 775                 if (wd->type == WD719X_TYPE_7193) /* narrow card - disable */
 776                         wd->params->wide = cpu_to_le32(0x00000000);
 777                 else    /* initiate & respond to WIDE messages */
 778                         wd->params->wide = cpu_to_le32(0xffffffff);
 779                 wd->params->sync        = cpu_to_le32(0xffffffff);
 780                 wd->params->soft_mask   = 0x00; /* all disabled */
 781                 wd->params->unsol_mask  = 0x00; /* all disabled */
 782         }
 783         /* disable TAGGED messages */
 784         wd->params->tag_en = cpu_to_le16(0x0000);
 785 }
 786
 787 /* Read card type from GPIO bits 1 and 3 */
 788 static enum wd719x_card_type wd719x_detect_type(struct wd719x *wd)
 789 {
 790         u8 card = wd719x_readb(wd, WD719X_PCI_GPIO_CONTROL);
 791
 792         card |= WD719X_GPIO_ID_BITS;
 793         wd719x_writeb(wd, WD719X_PCI_GPIO_CONTROL, card);
 794         card = wd719x_readb(wd, WD719X_PCI_GPIO_DATA) & WD719X_GPIO_ID_BITS;
 795         switch (card) {
 796         case 0x08:
 797                 return WD719X_TYPE_7193;
 798         case 0x02:
 799                 return WD719X_TYPE_7197;
 800         case 0x00:
 801                 return WD719X_TYPE_7296;
 802         default:
 803                 dev_warn(&wd->pdev->dev, "unknown card type 0x%x\n", card);
 804                 return WD719X_TYPE_UNKNOWN;
 805         }
 806 }
 807
 808 static int wd719x_board_found(struct Scsi_Host *sh)
 809 {
 810         struct wd719x *wd = shost_priv(sh);
 811         static const char * const card_types[] = {
 812                 "Unknown card", "WD7193", "WD7197", "WD7296"
 813         };
 814         int ret;
 815
 816         INIT_LIST_HEAD(&wd->active_scbs);
 817
 818         sh->base = pci_resource_start(wd->pdev, 0);
 819
 820         wd->type = wd719x_detect_type(wd);
 821
 822         wd->sh = sh;
 823         sh->irq = wd->pdev->irq;
 824         wd->fw_virt = NULL;
 825
 826         /* memory area for host (EEPROM) parameters */
 827         wd->params = dma_alloc_coherent(&wd->pdev->dev,
 828                                         sizeof(struct wd719x_host_param),
 829                                         &wd->params_phys, GFP_KERNEL);
 830         if (!wd->params) {
 831                 dev_warn(&wd->pdev->dev, "unable to allocate parameter buffer\n");
 832                 return -ENOMEM;
 833         }
 834
 835         /* memory area for the RISC for hash table of outstanding requests */
 836         wd->hash_virt = dma_alloc_coherent(&wd->pdev->dev,
 837                                            WD719X_HASH_TABLE_SIZE,
 838                                            &wd->hash_phys, GFP_KERNEL);
 839         if (!wd->hash_virt) {
 840                 dev_warn(&wd->pdev->dev, "unable to allocate hash buffer\n");
 841                 ret = -ENOMEM;
 842                 goto fail_free_params;
 843         }
 844
 845         ret = request_irq(wd->pdev->irq, wd719x_interrupt, IRQF_SHARED,
 846                           "wd719x", wd);
 847         if (ret) {
 848                 dev_warn(&wd->pdev->dev, "unable to assign IRQ %d\n",
 849                          wd->pdev->irq);
 850                 goto fail_free_hash;
 851         }
 852
 853         /* read parameters from EEPROM */
 854         wd719x_read_eeprom(wd);
 855
 856         ret = wd719x_chip_init(wd);
 857         if (ret)
 858                 goto fail_free_irq;
 859
 860         sh->this_id = wd->params->own_scsi_id & WD719X_EE_SCSI_ID_MASK;
 861
 862         dev_info(&wd->pdev->dev, "%s at I/O 0x%lx, IRQ %u, SCSI ID %d\n",
 863                  card_types[wd->type], sh->base, sh->irq, sh->this_id);
 864
 865         return 0;
 866
 867 fail_free_irq:
 868         free_irq(wd->pdev->irq, wd);
 869 fail_free_hash:
 870         dma_free_coherent(&wd->pdev->dev, WD719X_HASH_TABLE_SIZE, wd->hash_virt,
 871                             wd->hash_phys);
 872 fail_free_params:
 873         dma_free_coherent(&wd->pdev->dev, sizeof(struct wd719x_host_param),
 874                             wd->params, wd->params_phys);
 875
 876         return ret;
 877 }
 878
 879 static struct scsi_host_template wd719x_template = {
 880         .module                         = THIS_MODULE,
 881         .name                           = "Western Digital 719x",
 882         .cmd_size                       = sizeof(struct wd719x_scb),
 883         .queuecommand                   = wd719x_queuecommand,
 884         .eh_abort_handler               = wd719x_abort,
 885         .eh_device_reset_handler        = wd719x_dev_reset,
 886         .eh_bus_reset_handler           = wd719x_bus_reset,
 887         .eh_host_reset_handler          = wd719x_host_reset,
 888         .bios_param                     = wd719x_biosparam,
 889         .proc_name                      = "wd719x",
 890         .can_queue                      = 255,
 891         .this_id                        = 7,
 892         .sg_tablesize                   = WD719X_SG,
 893 };
 894
 895 static int wd719x_pci_probe(struct pci_dev *pdev, const struct pci_device_id *d)
 896 {
 897         int err;
 898         struct Scsi_Host *sh;
 899         struct wd719x *wd;
 900
 901         err = pci_enable_device(pdev);
 902         if (err)
 903                 goto fail;
 904
 905         if (dma_set_mask(&pdev->dev, DMA_BIT_MASK(32))) {
 906                 dev_warn(&pdev->dev, "Unable to set 32-bit DMA mask\n");
 907                 goto disable_device;
 908         }
 909
 910         err = pci_request_regions(pdev, "wd719x");
 911         if (err)
 912                 goto disable_device;
 913         pci_set_master(pdev);
 914
 915         err = -ENODEV;
 916         if (pci_resource_len(pdev, 0) == 0)
 917                 goto release_region;
 918
 919         err = -ENOMEM;
 920         sh = scsi_host_alloc(&wd719x_template, sizeof(struct wd719x));
 921         if (!sh)
 922                 goto release_region;
 923
 924         wd = shost_priv(sh);
 925         wd->base = pci_iomap(pdev, 0, 0);
 926         if (!wd->base)
 927                 goto free_host;
 928         wd->pdev = pdev;
 929
 930         err = wd719x_board_found(sh);
 931         if (err)
 932                 goto unmap;
 933
 934         err = scsi_add_host(sh, &wd->pdev->dev);
 935         if (err)
 936                 goto destroy;
 937
 938         scsi_scan_host(sh);
 939
 940         pci_set_drvdata(pdev, sh);
 941         return 0;
 942
 943 destroy:
 944         wd719x_destroy(wd);
 945 unmap:
 946         pci_iounmap(pdev, wd->base);
 947 free_host:
 948         scsi_host_put(sh);
 949 release_region:
 950         pci_release_regions(pdev);
 951 disable_device:
 952         pci_disable_device(pdev);
 953 fail:
 954         return err;
 955 }
 956
 957
 958 static void wd719x_pci_remove(struct pci_dev *pdev)
 959 {
 960         struct Scsi_Host *sh = pci_get_drvdata(pdev);
 961         struct wd719x *wd = shost_priv(sh);
 962
 963         scsi_remove_host(sh);
 964         wd719x_destroy(wd);
 965         pci_iounmap(pdev, wd->base);
 966         pci_release_regions(pdev);
 967         pci_disable_device(pdev);
 968
 969         scsi_host_put(sh);
 970 }
 971
 972 static const struct pci_device_id wd719x_pci_table[] = {
 973         { PCI_DEVICE(PCI_VENDOR_ID_WD, 0x3296) },
 974         {}
 975 };
 976
 977 MODULE_DEVICE_TABLE(pci, wd719x_pci_table);
 978
 979 static struct pci_driver wd719x_pci_driver = {
 980         .name =         "wd719x",
 981         .id_table =     wd719x_pci_table,
 982         .probe =        wd719x_pci_probe,
 983         .remove =       wd719x_pci_remove,
 984 };
 985
 986 module_pci_driver(wd719x_pci_driver);
 987
 988 MODULE_DESCRIPTION("Western Digital WD7193/7197/7296 SCSI driver");
 989 MODULE_AUTHOR("Ondrej Zary, Aaron Dewell, Juergen Gaertner");
 990 MODULE_LICENSE("GPL");
 991 MODULE_FIRMWARE("wd719x-wcs.bin");
 992 MODULE_FIRMWARE("wd719x-risc.bin");