drivers/ata/pata_serverworks.c

   1 /*
   2  * pata_serverworks.c   - Serverworks PATA for new ATA layer
   3  *                        (C) 2005 Red Hat Inc
   4  *                        (C) 2010 Bartlomiej Zolnierkiewicz
   5  *
   6  * based upon
   7  *
   8  * serverworks.c
   9  *
  10  * Copyright (C) 1998-2000 Michel Aubry
  11  * Copyright (C) 1998-2000 Andrzej Krzysztofowicz
  12  * Copyright (C) 1998-2000 Andre Hedrick <andre@linux-ide.org>
  13  * Portions copyright (c) 2001 Sun Microsystems
  14  *
  15  *
  16  * RCC/ServerWorks IDE driver for Linux
  17  *
  18  *   OSB4: `Open South Bridge' IDE Interface (fn 1)
  19  *         supports UDMA mode 2 (33 MB/s)
  20  *
  21  *   CSB5: `Champion South Bridge' IDE Interface (fn 1)
  22  *         all revisions support UDMA mode 4 (66 MB/s)
  23  *         revision A2.0 and up support UDMA mode 5 (100 MB/s)
  24  *
  25  *         *** The CSB5 does not provide ANY register ***
  26  *         *** to detect 80-conductor cable presence. ***
  27  *
  28  *   CSB6: `Champion South Bridge' IDE Interface (optional: third channel)
  29  *
  30  * Documentation:
  31  *      Available under NDA only. Errata info very hard to get.
  32  */
  33
  34 #include <linux/kernel.h>
  35 #include <linux/module.h>
  36 #include <linux/pci.h>
  37 #include <linux/blkdev.h>
  38 #include <linux/delay.h>
  39 #include <scsi/scsi_host.h>
  40 #include <linux/libata.h>
  41
  42 #define DRV_NAME "pata_serverworks"
  43 #define DRV_VERSION "0.4.3"
  44
  45 #define SVWKS_CSB5_REVISION_NEW 0x92 /* min PCI_REVISION_ID for UDMA5 (A2.0) */
  46 #define SVWKS_CSB6_REVISION     0xa0 /* min PCI_REVISION_ID for UDMA4 (A1.0) */
  47
  48 /* Seagate Barracuda ATA IV Family drives in UDMA mode 5
  49  * can overrun their FIFOs when used with the CSB5 */
  50
  51 static const char *csb_bad_ata100[] = {
  52         "ST320011A",
  53         "ST340016A",
  54         "ST360021A",
  55         "ST380021A",
  56         NULL
  57 };
  58
  59 /**
  60  *      oem_cable       -       Dell/Sun serverworks cable detection
  61  *      @ap: ATA port to do cable detect
  62  *
  63  *      Dell PowerEdge and Sun Cobalt 'Alpine' hide the 40/80 pin select
  64  *      for their interfaces in the top two bits of the subsystem ID.
  65  */
  66
  67 static int oem_cable(struct ata_port *ap)
  68 {
  69         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  70
  71         if (pdev->subsystem_device & (1 << (ap->port_no + 14)))
  72                 return ATA_CBL_PATA80;
  73         return ATA_CBL_PATA40;
  74 }
  75
  76 struct sv_cable_table {
  77         int device;
  78         int subvendor;
  79         int (*cable_detect)(struct ata_port *ap);
  80 };
  81
  82 static struct sv_cable_table cable_detect[] = {
  83         { PCI_DEVICE_ID_SERVERWORKS_CSB5IDE,   PCI_VENDOR_ID_DELL, oem_cable },
  84         { PCI_DEVICE_ID_SERVERWORKS_CSB6IDE,   PCI_VENDOR_ID_DELL, oem_cable },
  85         { PCI_DEVICE_ID_SERVERWORKS_CSB5IDE,   PCI_VENDOR_ID_SUN,  oem_cable },
  86         { PCI_DEVICE_ID_SERVERWORKS_OSB4IDE,   PCI_ANY_ID, ata_cable_40wire  },
  87         { PCI_DEVICE_ID_SERVERWORKS_CSB5IDE,   PCI_ANY_ID, ata_cable_unknown },
  88         { PCI_DEVICE_ID_SERVERWORKS_CSB6IDE,   PCI_ANY_ID, ata_cable_unknown },
  89         { PCI_DEVICE_ID_SERVERWORKS_CSB6IDE2,  PCI_ANY_ID, ata_cable_unknown },
  90         { PCI_DEVICE_ID_SERVERWORKS_HT1000IDE, PCI_ANY_ID, ata_cable_unknown },
  91         { }
  92 };
  93
  94 /**
  95  *      serverworks_cable_detect        -       cable detection
  96  *      @ap: ATA port
  97  *
  98  *      Perform cable detection according to the device and subvendor
  99  *      identifications
 100  */
 101
 102 static int serverworks_cable_detect(struct ata_port *ap)
 103 {
 104         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 105         struct sv_cable_table *cb = cable_detect;
 106
 107         while(cb->device) {
 108                 if (cb->device == pdev->device &&
 109                     (cb->subvendor == pdev->subsystem_vendor ||
 110                       cb->subvendor == PCI_ANY_ID)) {
 111                         return cb->cable_detect(ap);
 112                 }
 113                 cb++;
 114         }
 115
 116         BUG();
 117         return -1;      /* kill compiler warning */
 118 }
 119
 120 /**
 121  *      serverworks_is_csb      -       Check for CSB or OSB
 122  *      @pdev: PCI device to check
 123  *
 124  *      Returns true if the device being checked is known to be a CSB
 125  *      series device.
 126  */
 127
 128 static u8 serverworks_is_csb(struct pci_dev *pdev)
 129 {
 130         switch (pdev->device) {
 131                 case PCI_DEVICE_ID_SERVERWORKS_CSB5IDE:
 132                 case PCI_DEVICE_ID_SERVERWORKS_CSB6IDE:
 133                 case PCI_DEVICE_ID_SERVERWORKS_CSB6IDE2:
 134                 case PCI_DEVICE_ID_SERVERWORKS_HT1000IDE:
 135                         return 1;
 136                 default:
 137                         break;
 138         }
 139         return 0;
 140 }
 141
 142 /**
 143  *      serverworks_osb4_filter -       mode selection filter
 144  *      @adev: ATA device
 145  *      @mask: Mask of proposed modes
 146  *
 147  *      Filter the offered modes for the device to apply controller
 148  *      specific rules. OSB4 requires no UDMA for disks due to a FIFO
 149  *      bug we hit.
 150  */
 151
 152 static unsigned long serverworks_osb4_filter(struct ata_device *adev, unsigned long mask)
 153 {
 154         if (adev->class == ATA_DEV_ATA)
 155                 mask &= ~ATA_MASK_UDMA;
 156         return mask;
 157 }
 158
 159
 160 /**
 161  *      serverworks_csb_filter  -       mode selection filter
 162  *      @adev: ATA device
 163  *      @mask: Mask of proposed modes
 164  *
 165  *      Check the blacklist and disable UDMA5 if matched
 166  */
 167
 168 static unsigned long serverworks_csb_filter(struct ata_device *adev, unsigned long mask)
 169 {
 170         const char *p;
 171         char model_num[ATA_ID_PROD_LEN + 1];
 172         int i;
 173
 174         /* Disk, UDMA */
 175         if (adev->class != ATA_DEV_ATA)
 176                 return mask;
 177
 178         /* Actually do need to check */
 179         ata_id_c_string(adev->id, model_num, ATA_ID_PROD, sizeof(model_num));
 180
 181         for (i = 0; (p = csb_bad_ata100[i]) != NULL; i++) {
 182                 if (!strcmp(p, model_num))
 183                         mask &= ~(0xE0 << ATA_SHIFT_UDMA);
 184         }
 185         return mask;
 186 }
 187
 188 /**
 189  *      serverworks_set_piomode -       set initial PIO mode data
 190  *      @ap: ATA interface
 191  *      @adev: ATA device
 192  *
 193  *      Program the OSB4/CSB5 timing registers for PIO. The PIO register
 194  *      load is done as a simple lookup.
 195  */
 196 static void serverworks_set_piomode(struct ata_port *ap, struct ata_device *adev)
 197 {
 198         static const u8 pio_mode[] = { 0x5d, 0x47, 0x34, 0x22, 0x20 };
 199         int offset = 1 + 2 * ap->port_no - adev->devno;
 200         int devbits = (2 * ap->port_no + adev->devno) * 4;
 201         u16 csb5_pio;
 202         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 203         int pio = adev->pio_mode - XFER_PIO_0;
 204
 205         pci_write_config_byte(pdev, 0x40 + offset, pio_mode[pio]);
 206
 207         /* The OSB4 just requires the timing but the CSB series want the
 208            mode number as well */
 209         if (serverworks_is_csb(pdev)) {
 210                 pci_read_config_word(pdev, 0x4A, &csb5_pio);
 211                 csb5_pio &= ~(0x0F << devbits);
 212                 pci_write_config_word(pdev, 0x4A, csb5_pio | (pio << devbits));
 213         }
 214 }
 215
 216 /**
 217  *      serverworks_set_dmamode -       set initial DMA mode data
 218  *      @ap: ATA interface
 219  *      @adev: ATA device
 220  *
 221  *      Program the MWDMA/UDMA modes for the serverworks OSB4/CSB5
 222  *      chipset. The MWDMA mode values are pulled from a lookup table
 223  *      while the chipset uses mode number for UDMA.
 224  */
 225
 226 static void serverworks_set_dmamode(struct ata_port *ap, struct ata_device *adev)
 227 {
 228         static const u8 dma_mode[] = { 0x77, 0x21, 0x20 };
 229         int offset = 1 + 2 * ap->port_no - adev->devno;
 230         int devbits = 2 * ap->port_no + adev->devno;
 231         u8 ultra;
 232         u8 ultra_cfg;
 233         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 234
 235         pci_read_config_byte(pdev, 0x54, &ultra_cfg);
 236         pci_read_config_byte(pdev, 0x56 + ap->port_no, &ultra);
 237         ultra &= ~(0x0F << (adev->devno * 4));
 238
 239         if (adev->dma_mode >= XFER_UDMA_0) {
 240                 pci_write_config_byte(pdev, 0x44 + offset,  0x20);
 241
 242                 ultra |= (adev->dma_mode - XFER_UDMA_0)
 243                                         << (adev->devno * 4);
 244                 ultra_cfg |=  (1 << devbits);
 245         } else {
 246                 pci_write_config_byte(pdev, 0x44 + offset,
 247                         dma_mode[adev->dma_mode - XFER_MW_DMA_0]);
 248                 ultra_cfg &= ~(1 << devbits);
 249         }
 250         pci_write_config_byte(pdev, 0x56 + ap->port_no, ultra);
 251         pci_write_config_byte(pdev, 0x54, ultra_cfg);
 252 }
 253
 254 static struct scsi_host_template serverworks_sht = {
 255         ATA_BMDMA_SHT(DRV_NAME),
 256 };
 257
 258 static struct ata_port_operations serverworks_osb4_port_ops = {
 259         .inherits       = &ata_bmdma_port_ops,
 260         .cable_detect   = serverworks_cable_detect,
 261         .mode_filter    = serverworks_osb4_filter,
 262         .set_piomode    = serverworks_set_piomode,
 263         .set_dmamode    = serverworks_set_dmamode,
 264 };
 265
 266 static struct ata_port_operations serverworks_csb_port_ops = {
 267         .inherits       = &serverworks_osb4_port_ops,
 268         .mode_filter    = serverworks_csb_filter,
 269 };
 270
 271 static int serverworks_fixup_osb4(struct pci_dev *pdev)
 272 {
 273         u32 reg;
 274         struct pci_dev *isa_dev = pci_get_device(PCI_VENDOR_ID_SERVERWORKS,
 275                   PCI_DEVICE_ID_SERVERWORKS_OSB4, NULL);
 276         if (isa_dev) {
 277                 pci_read_config_dword(isa_dev, 0x64, &reg);
 278                 reg &= ~0x00002000; /* disable 600ns interrupt mask */
 279                 if (!(reg & 0x00004000))
 280                         printk(KERN_DEBUG DRV_NAME ": UDMA not BIOS enabled.\n");
 281                 reg |=  0x00004000; /* enable UDMA/33 support */
 282                 pci_write_config_dword(isa_dev, 0x64, reg);
 283                 pci_dev_put(isa_dev);
 284                 return 0;
 285         }
 286         printk(KERN_WARNING DRV_NAME ": Unable to find bridge.\n");
 287         return -ENODEV;
 288 }
 289
 290 static int serverworks_fixup_csb(struct pci_dev *pdev)
 291 {
 292         u8 btr;
 293
 294         /* Third Channel Test */
 295         if (!(PCI_FUNC(pdev->devfn) & 1)) {
 296                 struct pci_dev * findev = NULL;
 297                 u32 reg4c = 0;
 298                 findev = pci_get_device(PCI_VENDOR_ID_SERVERWORKS,
 299                         PCI_DEVICE_ID_SERVERWORKS_CSB5, NULL);
 300                 if (findev) {
 301                         pci_read_config_dword(findev, 0x4C, &reg4c);
 302                         reg4c &= ~0x000007FF;
 303                         reg4c |=  0x00000040;
 304                         reg4c |=  0x00000020;
 305                         pci_write_config_dword(findev, 0x4C, reg4c);
 306                         pci_dev_put(findev);
 307                 }
 308         } else {
 309                 struct pci_dev * findev = NULL;
 310                 u8 reg41 = 0;
 311
 312                 findev = pci_get_device(PCI_VENDOR_ID_SERVERWORKS,
 313                                 PCI_DEVICE_ID_SERVERWORKS_CSB6, NULL);
 314                 if (findev) {
 315                         pci_read_config_byte(findev, 0x41, &reg41);
 316                         reg41 &= ~0x40;
 317                         pci_write_config_byte(findev, 0x41, reg41);
 318                         pci_dev_put(findev);
 319                 }
 320         }
 321         /* setup the UDMA Control register
 322          *
 323          * 1. clear bit 6 to enable DMA
 324          * 2. enable DMA modes with bits 0-1
 325          *      00 : legacy
 326          *      01 : udma2
 327          *      10 : udma2/udma4
 328          *      11 : udma2/udma4/udma5
 329          */
 330         pci_read_config_byte(pdev, 0x5A, &btr);
 331         btr &= ~0x40;
 332         if (!(PCI_FUNC(pdev->devfn) & 1))
 333                 btr |= 0x2;
 334         else
 335                 btr |= (pdev->revision >= SVWKS_CSB5_REVISION_NEW) ? 0x3 : 0x2;
 336         pci_write_config_byte(pdev, 0x5A, btr);
 337
 338         return btr;
 339 }
 340
 341 static void serverworks_fixup_ht1000(struct pci_dev *pdev)
 342 {
 343         u8 btr;
 344         /* Setup HT1000 SouthBridge Controller - Single Channel Only */
 345         pci_read_config_byte(pdev, 0x5A, &btr);
 346         btr &= ~0x40;
 347         btr |= 0x3;
 348         pci_write_config_byte(pdev, 0x5A, btr);
 349 }
 350
 351 static int serverworks_fixup(struct pci_dev *pdev)
 352 {
 353         int rc = 0;
 354
 355         /* Force master latency timer to 64 PCI clocks */
 356         pci_write_config_byte(pdev, PCI_LATENCY_TIMER, 0x40);
 357
 358         switch (pdev->device) {
 359         case PCI_DEVICE_ID_SERVERWORKS_OSB4IDE:
 360                 rc = serverworks_fixup_osb4(pdev);
 361                 break;
 362         case PCI_DEVICE_ID_SERVERWORKS_CSB5IDE:
 363                 ata_pci_bmdma_clear_simplex(pdev);
 364                 /* fall through */
 365         case PCI_DEVICE_ID_SERVERWORKS_CSB6IDE:
 366         case PCI_DEVICE_ID_SERVERWORKS_CSB6IDE2:
 367                 rc = serverworks_fixup_csb(pdev);
 368                 break;
 369         case PCI_DEVICE_ID_SERVERWORKS_HT1000IDE:
 370                 serverworks_fixup_ht1000(pdev);
 371                 break;
 372         }
 373
 374         return rc;
 375 }
 376
 377 static int serverworks_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
 378 {
 379         static const struct ata_port_info info[4] = {
 380                 { /* OSB4 */
 381                         .flags = ATA_FLAG_SLAVE_POSS,
 382                         .pio_mask = ATA_PIO4,
 383                         .mwdma_mask = ATA_MWDMA2,
 384                         .udma_mask = ATA_UDMA2,
 385                         .port_ops = &serverworks_osb4_port_ops
 386                 }, { /* OSB4 no UDMA */
 387                         .flags = ATA_FLAG_SLAVE_POSS,
 388                         .pio_mask = ATA_PIO4,
 389                         .mwdma_mask = ATA_MWDMA2,
 390                         /* No UDMA */
 391                         .port_ops = &serverworks_osb4_port_ops
 392                 }, { /* CSB5 */
 393                         .flags = ATA_FLAG_SLAVE_POSS,
 394                         .pio_mask = ATA_PIO4,
 395                         .mwdma_mask = ATA_MWDMA2,
 396                         .udma_mask = ATA_UDMA4,
 397                         .port_ops = &serverworks_csb_port_ops
 398                 }, { /* CSB5 - later revisions*/
 399                         .flags = ATA_FLAG_SLAVE_POSS,
 400                         .pio_mask = ATA_PIO4,
 401                         .mwdma_mask = ATA_MWDMA2,
 402                         .udma_mask = ATA_UDMA5,
 403                         .port_ops = &serverworks_csb_port_ops
 404                 }
 405         };
 406         const struct ata_port_info *ppi[] = { &info[id->driver_data], NULL };
 407         int rc;
 408
 409         rc = pcim_enable_device(pdev);
 410         if (rc)
 411                 return rc;
 412
 413         rc = serverworks_fixup(pdev);
 414
 415         /* OSB4 : South Bridge and IDE */
 416         if (pdev->device == PCI_DEVICE_ID_SERVERWORKS_OSB4IDE) {
 417                 /* Select non UDMA capable OSB4 if we can't do fixups */
 418                 if (rc < 0)
 419                         ppi[0] = &info[1];
 420         }
 421         /* setup CSB5/CSB6 : South Bridge and IDE option RAID */
 422         else if ((pdev->device == PCI_DEVICE_ID_SERVERWORKS_CSB5IDE) ||
 423                  (pdev->device == PCI_DEVICE_ID_SERVERWORKS_CSB6IDE) ||
 424                  (pdev->device == PCI_DEVICE_ID_SERVERWORKS_CSB6IDE2)) {
 425
 426                  /* If the returned btr is the newer revision then
 427                     select the right info block */
 428                  if (rc == 3)
 429                         ppi[0] = &info[3];
 430
 431                 /* Is this the 3rd channel CSB6 IDE ? */
 432                 if (pdev->device == PCI_DEVICE_ID_SERVERWORKS_CSB6IDE2)
 433                         ppi[1] = &ata_dummy_port_info;
 434         }
 435
 436         return ata_pci_bmdma_init_one(pdev, ppi, &serverworks_sht, NULL, 0);
 437 }
 438
 439 #ifdef CONFIG_PM_SLEEP
 440 static int serverworks_reinit_one(struct pci_dev *pdev)
 441 {
 442         struct ata_host *host = pci_get_drvdata(pdev);
 443         int rc;
 444
 445         rc = ata_pci_device_do_resume(pdev);
 446         if (rc)
 447                 return rc;
 448
 449         (void)serverworks_fixup(pdev);
 450
 451         ata_host_resume(host);
 452         return 0;
 453 }
 454 #endif
 455
 456 static const struct pci_device_id serverworks[] = {
 457         { PCI_VDEVICE(SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_OSB4IDE), 0},
 458         { PCI_VDEVICE(SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_CSB5IDE), 2},
 459         { PCI_VDEVICE(SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_CSB6IDE), 2},
 460         { PCI_VDEVICE(SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_CSB6IDE2), 2},
 461         { PCI_VDEVICE(SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_HT1000IDE), 2},
 462
 463         { },
 464 };
 465
 466 static struct pci_driver serverworks_pci_driver = {
 467         .name           = DRV_NAME,
 468         .id_table       = serverworks,
 469         .probe          = serverworks_init_one,
 470         .remove         = ata_pci_remove_one,
 471 #ifdef CONFIG_PM_SLEEP
 472         .suspend        = ata_pci_device_suspend,
 473         .resume         = serverworks_reinit_one,
 474 #endif
 475 };
 476
 477 module_pci_driver(serverworks_pci_driver);
 478
 479 MODULE_AUTHOR("Alan Cox");
 480 MODULE_DESCRIPTION("low-level driver for Serverworks OSB4/CSB5/CSB6");
 481 MODULE_LICENSE("GPL");
 482 MODULE_DEVICE_TABLE(pci, serverworks);
 483 MODULE_VERSION(DRV_VERSION);