drivers/ata/pata_via.c

   1 /*
   2  * pata_via.c   - VIA PATA for new ATA layer
   3  *                        (C) 2005-2006 Red Hat Inc
   4  *                        Alan Cox <alan@redhat.com>
   5  *
   6  *  Documentation
   7  *      Most chipset documentation available under NDA only
   8  *
   9  *  VIA version guide
  10  *      VIA VT82C561    -       early design, uses ata_generic currently
  11  *      VIA VT82C576    -       MWDMA, 33Mhz
  12  *      VIA VT82C586    -       MWDMA, 33Mhz
  13  *      VIA VT82C586a   -       Added UDMA to 33Mhz
  14  *      VIA VT82C586b   -       UDMA33
  15  *      VIA VT82C596a   -       Nonfunctional UDMA66
  16  *      VIA VT82C596b   -       Working UDMA66
  17  *      VIA VT82C686    -       Nonfunctional UDMA66
  18  *      VIA VT82C686a   -       Working UDMA66
  19  *      VIA VT82C686b   -       Updated to UDMA100
  20  *      VIA VT8231      -       UDMA100
  21  *      VIA VT8233      -       UDMA100
  22  *      VIA VT8233a     -       UDMA133
  23  *      VIA VT8233c     -       UDMA100
  24  *      VIA VT8235      -       UDMA133
  25  *      VIA VT8237      -       UDMA133
  26  *      VIA VT8237S     -       UDMA133
  27  *      VIA VT8251      -       UDMA133
  28  *
  29  *      Most registers remain compatible across chips. Others start reserved
  30  *      and acquire sensible semantics if set to 1 (eg cable detect). A few
  31  *      exceptions exist, notably around the FIFO settings.
  32  *
  33  *      One additional quirk of the VIA design is that like ALi they use few
  34  *      PCI IDs for a lot of chips.
  35  *
  36  *      Based heavily on:
  37  *
  38  * Version 3.38
  39  *
  40  * VIA IDE driver for Linux. Supported southbridges:
  41  *
  42  *   vt82c576, vt82c586, vt82c586a, vt82c586b, vt82c596a, vt82c596b,
  43  *   vt82c686, vt82c686a, vt82c686b, vt8231, vt8233, vt8233c, vt8233a,
  44  *   vt8235, vt8237
  45  *
  46  * Copyright (c) 2000-2002 Vojtech Pavlik
  47  *
  48  * Based on the work of:
  49  *      Michel Aubry
  50  *      Jeff Garzik
  51  *      Andre Hedrick
  52
  53  */
  54
  55 #include <linux/kernel.h>
  56 #include <linux/module.h>
  57 #include <linux/pci.h>
  58 #include <linux/init.h>
  59 #include <linux/blkdev.h>
  60 #include <linux/delay.h>
  61 #include <scsi/scsi_host.h>
  62 #include <linux/libata.h>
  63 #include <linux/dmi.h>
  64
  65 #define DRV_NAME "pata_via"
  66 #define DRV_VERSION "0.3.3"
  67
  68 /*
  69  *      The following comes directly from Vojtech Pavlik's ide/pci/via82cxxx
  70  *      driver.
  71  */
  72
  73 enum {
  74         VIA_UDMA        = 0x007,
  75         VIA_UDMA_NONE   = 0x000,
  76         VIA_UDMA_33     = 0x001,
  77         VIA_UDMA_66     = 0x002,
  78         VIA_UDMA_100    = 0x003,
  79         VIA_UDMA_133    = 0x004,
  80         VIA_BAD_PREQ    = 0x010, /* Crashes if PREQ# till DDACK# set */
  81         VIA_BAD_CLK66   = 0x020, /* 66 MHz clock doesn't work correctly */
  82         VIA_SET_FIFO    = 0x040, /* Needs to have FIFO split set */
  83         VIA_NO_UNMASK   = 0x080, /* Doesn't work with IRQ unmasking on */
  84         VIA_BAD_ID      = 0x100, /* Has wrong vendor ID (0x1107) */
  85         VIA_BAD_AST     = 0x200, /* Don't touch Address Setup Timing */
  86         VIA_NO_ENABLES  = 0x400, /* Has no enablebits */
  87         VIA_SATA_PATA   = 0x800, /* SATA/PATA combined configuration */
  88 };
  89
  90 /*
  91  * VIA SouthBridge chips.
  92  */
  93
  94 static const struct via_isa_bridge {
  95         const char *name;
  96         u16 id;
  97         u8 rev_min;
  98         u8 rev_max;
  99         u16 flags;
 100 } via_isa_bridges[] = {
 101         { "vx800",      PCI_DEVICE_ID_VIA_VX800,    0x00, 0x2f, VIA_UDMA_133 |
 102         VIA_BAD_AST | VIA_SATA_PATA },
 103         { "vt8237s",    PCI_DEVICE_ID_VIA_8237S,    0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
 104         { "vt8251",     PCI_DEVICE_ID_VIA_8251,     0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
 105         { "cx700",      PCI_DEVICE_ID_VIA_CX700,    0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST | VIA_SATA_PATA },
 106         { "vt6410",     PCI_DEVICE_ID_VIA_6410,     0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST | VIA_NO_ENABLES},
 107         { "vt8237a",    PCI_DEVICE_ID_VIA_8237A,    0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
 108         { "vt8237",     PCI_DEVICE_ID_VIA_8237,     0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
 109         { "vt8235",     PCI_DEVICE_ID_VIA_8235,     0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
 110         { "vt8233a",    PCI_DEVICE_ID_VIA_8233A,    0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
 111         { "vt8233c",    PCI_DEVICE_ID_VIA_8233C_0,  0x00, 0x2f, VIA_UDMA_100 },
 112         { "vt8233",     PCI_DEVICE_ID_VIA_8233_0,   0x00, 0x2f, VIA_UDMA_100 },
 113         { "vt8231",     PCI_DEVICE_ID_VIA_8231,     0x00, 0x2f, VIA_UDMA_100 },
 114         { "vt82c686b",  PCI_DEVICE_ID_VIA_82C686,   0x40, 0x4f, VIA_UDMA_100 },
 115         { "vt82c686a",  PCI_DEVICE_ID_VIA_82C686,   0x10, 0x2f, VIA_UDMA_66 },
 116         { "vt82c686",   PCI_DEVICE_ID_VIA_82C686,   0x00, 0x0f, VIA_UDMA_33 | VIA_BAD_CLK66 },
 117         { "vt82c596b",  PCI_DEVICE_ID_VIA_82C596,   0x10, 0x2f, VIA_UDMA_66 },
 118         { "vt82c596a",  PCI_DEVICE_ID_VIA_82C596,   0x00, 0x0f, VIA_UDMA_33 | VIA_BAD_CLK66 },
 119         { "vt82c586b",  PCI_DEVICE_ID_VIA_82C586_0, 0x47, 0x4f, VIA_UDMA_33 | VIA_SET_FIFO },
 120         { "vt82c586b",  PCI_DEVICE_ID_VIA_82C586_0, 0x40, 0x46, VIA_UDMA_33 | VIA_SET_FIFO | VIA_BAD_PREQ },
 121         { "vt82c586b",  PCI_DEVICE_ID_VIA_82C586_0, 0x30, 0x3f, VIA_UDMA_33 | VIA_SET_FIFO },
 122         { "vt82c586a",  PCI_DEVICE_ID_VIA_82C586_0, 0x20, 0x2f, VIA_UDMA_33 | VIA_SET_FIFO },
 123         { "vt82c586",   PCI_DEVICE_ID_VIA_82C586_0, 0x00, 0x0f, VIA_UDMA_NONE | VIA_SET_FIFO },
 124         { "vt82c576",   PCI_DEVICE_ID_VIA_82C576,   0x00, 0x2f, VIA_UDMA_NONE | VIA_SET_FIFO | VIA_NO_UNMASK },
 125         { "vt82c576",   PCI_DEVICE_ID_VIA_82C576,   0x00, 0x2f, VIA_UDMA_NONE | VIA_SET_FIFO | VIA_NO_UNMASK | VIA_BAD_ID },
 126         { NULL }
 127 };
 128
 129
 130 /*
 131  *      Cable special cases
 132  */
 133
 134 static const struct dmi_system_id cable_dmi_table[] = {
 135         {
 136                 .ident = "Acer Ferrari 3400",
 137                 .matches = {
 138                         DMI_MATCH(DMI_BOARD_VENDOR, "Acer,Inc."),
 139                         DMI_MATCH(DMI_BOARD_NAME, "Ferrari 3400"),
 140                 },
 141         },
 142         { }
 143 };
 144
 145 static int via_cable_override(struct pci_dev *pdev)
 146 {
 147         /* Systems by DMI */
 148         if (dmi_check_system(cable_dmi_table))
 149                 return 1;
 150         /* Arima W730-K8/Targa Visionary 811/... */
 151         if (pdev->subsystem_vendor == 0x161F && pdev->subsystem_device == 0x2032)
 152                 return 1;
 153         return 0;
 154 }
 155
 156
 157 /**
 158  *      via_cable_detect        -       cable detection
 159  *      @ap: ATA port
 160  *
 161  *      Perform cable detection. Actually for the VIA case the BIOS
 162  *      already did this for us. We read the values provided by the
 163  *      BIOS. If you are using an 8235 in a non-PC configuration you
 164  *      may need to update this code.
 165  *
 166  *      Hotplug also impacts on this.
 167  */
 168
 169 static int via_cable_detect(struct ata_port *ap) {
 170         const struct via_isa_bridge *config = ap->host->private_data;
 171         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 172         u32 ata66;
 173
 174         if (via_cable_override(pdev))
 175                 return ATA_CBL_PATA40_SHORT;
 176
 177         if ((config->flags & VIA_SATA_PATA) && ap->port_no == 0)
 178                 return ATA_CBL_SATA;
 179
 180         /* Early chips are 40 wire */
 181         if ((config->flags & VIA_UDMA) < VIA_UDMA_66)
 182                 return ATA_CBL_PATA40;
 183         /* UDMA 66 chips have only drive side logic */
 184         else if ((config->flags & VIA_UDMA) < VIA_UDMA_100)
 185                 return ATA_CBL_PATA_UNK;
 186         /* UDMA 100 or later */
 187         pci_read_config_dword(pdev, 0x50, &ata66);
 188         /* Check both the drive cable reporting bits, we might not have
 189            two drives */
 190         if (ata66 & (0x10100000 >> (16 * ap->port_no)))
 191                 return ATA_CBL_PATA80;
 192         /* Check with ACPI so we can spot BIOS reported SATA bridges */
 193         if (ata_acpi_init_gtm(ap) &&
 194             ata_acpi_cbl_80wire(ap, ata_acpi_init_gtm(ap)))
 195                 return ATA_CBL_PATA80;
 196         return ATA_CBL_PATA40;
 197 }
 198
 199 static int via_pre_reset(struct ata_link *link, unsigned long deadline)
 200 {
 201         struct ata_port *ap = link->ap;
 202         const struct via_isa_bridge *config = ap->host->private_data;
 203
 204         if (!(config->flags & VIA_NO_ENABLES)) {
 205                 static const struct pci_bits via_enable_bits[] = {
 206                         { 0x40, 1, 0x02, 0x02 },
 207                         { 0x40, 1, 0x01, 0x01 }
 208                 };
 209                 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 210                 if (!pci_test_config_bits(pdev, &via_enable_bits[ap->port_no]))
 211                         return -ENOENT;
 212         }
 213
 214         return ata_sff_prereset(link, deadline);
 215 }
 216
 217
 218 /**
 219  *      via_do_set_mode -       set initial PIO mode data
 220  *      @ap: ATA interface
 221  *      @adev: ATA device
 222  *      @mode: ATA mode being programmed
 223  *      @tdiv: Clocks per PCI clock
 224  *      @set_ast: Set to program address setup
 225  *      @udma_type: UDMA mode/format of registers
 226  *
 227  *      Program the VIA registers for DMA and PIO modes. Uses the ata timing
 228  *      support in order to compute modes.
 229  *
 230  *      FIXME: Hotplug will require we serialize multiple mode changes
 231  *      on the two channels.
 232  */
 233
 234 static void via_do_set_mode(struct ata_port *ap, struct ata_device *adev, int mode, int tdiv, int set_ast, int udma_type)
 235 {
 236         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 237         struct ata_device *peer = ata_dev_pair(adev);
 238         struct ata_timing t, p;
 239         static int via_clock = 33333;   /* Bus clock in kHZ - ought to be tunable one day */
 240         unsigned long T =  1000000000 / via_clock;
 241         unsigned long UT = T/tdiv;
 242         int ut;
 243         int offset = 3 - (2*ap->port_no) - adev->devno;
 244
 245         /* Calculate the timing values we require */
 246         ata_timing_compute(adev, mode, &t, T, UT);
 247
 248         /* We share 8bit timing so we must merge the constraints */
 249         if (peer) {
 250                 if (peer->pio_mode) {
 251                         ata_timing_compute(peer, peer->pio_mode, &p, T, UT);
 252                         ata_timing_merge(&p, &t, &t, ATA_TIMING_8BIT);
 253                 }
 254         }
 255
 256         /* Address setup is programmable but breaks on UDMA133 setups */
 257         if (set_ast) {
 258                 u8 setup;       /* 2 bits per drive */
 259                 int shift = 2 * offset;
 260
 261                 pci_read_config_byte(pdev, 0x4C, &setup);
 262                 setup &= ~(3 << shift);
 263                 setup |= clamp_val(t.setup, 1, 4) << shift;     /* 1,4 or 1,4 - 1  FIXME */
 264                 pci_write_config_byte(pdev, 0x4C, setup);
 265         }
 266
 267         /* Load the PIO mode bits */
 268         pci_write_config_byte(pdev, 0x4F - ap->port_no,
 269                 ((clamp_val(t.act8b, 1, 16) - 1) << 4) | (clamp_val(t.rec8b, 1, 16) - 1));
 270         pci_write_config_byte(pdev, 0x48 + offset,
 271                 ((clamp_val(t.active, 1, 16) - 1) << 4) | (clamp_val(t.recover, 1, 16) - 1));
 272
 273         /* Load the UDMA bits according to type */
 274         switch(udma_type) {
 275                 default:
 276                         /* BUG() ? */
 277                         /* fall through */
 278                 case 33:
 279                         ut = t.udma ? (0xe0 | (clamp_val(t.udma, 2, 5) - 2)) : 0x03;
 280                         break;
 281                 case 66:
 282                         ut = t.udma ? (0xe8 | (clamp_val(t.udma, 2, 9) - 2)) : 0x0f;
 283                         break;
 284                 case 100:
 285                         ut = t.udma ? (0xe0 | (clamp_val(t.udma, 2, 9) - 2)) : 0x07;
 286                         break;
 287                 case 133:
 288                         ut = t.udma ? (0xe0 | (clamp_val(t.udma, 2, 9) - 2)) : 0x07;
 289                         break;
 290         }
 291
 292         /* Set UDMA unless device is not UDMA capable */
 293         if (udma_type && t.udma) {
 294                 u8 cable80_status;
 295
 296                 /* Get 80-wire cable detection bit */
 297                 pci_read_config_byte(pdev, 0x50 + offset, &cable80_status);
 298                 cable80_status &= 0x10;
 299
 300                 pci_write_config_byte(pdev, 0x50 + offset, ut | cable80_status);
 301         }
 302 }
 303
 304 static void via_set_piomode(struct ata_port *ap, struct ata_device *adev)
 305 {
 306         const struct via_isa_bridge *config = ap->host->private_data;
 307         int set_ast = (config->flags & VIA_BAD_AST) ? 0 : 1;
 308         int mode = config->flags & VIA_UDMA;
 309         static u8 tclock[5] = { 1, 1, 2, 3, 4 };
 310         static u8 udma[5] = { 0, 33, 66, 100, 133 };
 311
 312         via_do_set_mode(ap, adev, adev->pio_mode, tclock[mode], set_ast, udma[mode]);
 313 }
 314
 315 static void via_set_dmamode(struct ata_port *ap, struct ata_device *adev)
 316 {
 317         const struct via_isa_bridge *config = ap->host->private_data;
 318         int set_ast = (config->flags & VIA_BAD_AST) ? 0 : 1;
 319         int mode = config->flags & VIA_UDMA;
 320         static u8 tclock[5] = { 1, 1, 2, 3, 4 };
 321         static u8 udma[5] = { 0, 33, 66, 100, 133 };
 322
 323         via_do_set_mode(ap, adev, adev->dma_mode, tclock[mode], set_ast, udma[mode]);
 324 }
 325
 326 /**
 327  *      via_tf_load - send taskfile registers to host controller
 328  *      @ap: Port to which output is sent
 329  *      @tf: ATA taskfile register set
 330  *
 331  *      Outputs ATA taskfile to standard ATA host controller.
 332  *
 333  *      Note: This is to fix the internal bug of via chipsets, which
 334  *      will reset the device register after changing the IEN bit on
 335  *      ctl register
 336  */
 337 static void via_tf_load(struct ata_port *ap, const struct ata_taskfile *tf)
 338 {
 339         struct ata_taskfile tmp_tf;
 340
 341         if (ap->ctl != ap->last_ctl && !(tf->flags & ATA_TFLAG_DEVICE)) {
 342                 tmp_tf = *tf;
 343                 tmp_tf.flags |= ATA_TFLAG_DEVICE;
 344                 tf = &tmp_tf;
 345         }
 346         ata_sff_tf_load(ap, tf);
 347 }
 348
 349 static struct scsi_host_template via_sht = {
 350         ATA_BMDMA_SHT(DRV_NAME),
 351 };
 352
 353 static struct ata_port_operations via_port_ops = {
 354         .inherits       = &ata_bmdma_port_ops,
 355         .cable_detect   = via_cable_detect,
 356         .set_piomode    = via_set_piomode,
 357         .set_dmamode    = via_set_dmamode,
 358         .prereset       = via_pre_reset,
 359         .sff_tf_load    = via_tf_load,
 360 };
 361
 362 static struct ata_port_operations via_port_ops_noirq = {
 363         .inherits       = &via_port_ops,
 364         .sff_data_xfer  = ata_sff_data_xfer_noirq,
 365 };
 366
 367 /**
 368  *      via_config_fifo         -       set up the FIFO
 369  *      @pdev: PCI device
 370  *      @flags: configuration flags
 371  *
 372  *      Set the FIFO properties for this device if necessary. Used both on
 373  *      set up and on and the resume path
 374  */
 375
 376 static void via_config_fifo(struct pci_dev *pdev, unsigned int flags)
 377 {
 378         u8 enable;
 379
 380         /* 0x40 low bits indicate enabled channels */
 381         pci_read_config_byte(pdev, 0x40 , &enable);
 382         enable &= 3;
 383
 384         if (flags & VIA_SET_FIFO) {
 385                 static const u8 fifo_setting[4] = {0x00, 0x60, 0x00, 0x20};
 386                 u8 fifo;
 387
 388                 pci_read_config_byte(pdev, 0x43, &fifo);
 389
 390                 /* Clear PREQ# until DDACK# for errata */
 391                 if (flags & VIA_BAD_PREQ)
 392                         fifo &= 0x7F;
 393                 else
 394                         fifo &= 0x9f;
 395                 /* Turn on FIFO for enabled channels */
 396                 fifo |= fifo_setting[enable];
 397                 pci_write_config_byte(pdev, 0x43, fifo);
 398         }
 399 }
 400
 401 /**
 402  *      via_init_one            -       discovery callback
 403  *      @pdev: PCI device
 404  *      @id: PCI table info
 405  *
 406  *      A VIA IDE interface has been discovered. Figure out what revision
 407  *      and perform configuration work before handing it to the ATA layer
 408  */
 409
 410 static int via_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
 411 {
 412         /* Early VIA without UDMA support */
 413         static const struct ata_port_info via_mwdma_info = {
 414                 .flags = ATA_FLAG_SLAVE_POSS,
 415                 .pio_mask = 0x1f,
 416                 .mwdma_mask = 0x07,
 417                 .port_ops = &via_port_ops
 418         };
 419         /* Ditto with IRQ masking required */
 420         static const struct ata_port_info via_mwdma_info_borked = {
 421                 .flags = ATA_FLAG_SLAVE_POSS,
 422                 .pio_mask = 0x1f,
 423                 .mwdma_mask = 0x07,
 424                 .port_ops = &via_port_ops_noirq,
 425         };
 426         /* VIA UDMA 33 devices (and borked 66) */
 427         static const struct ata_port_info via_udma33_info = {
 428                 .flags = ATA_FLAG_SLAVE_POSS,
 429                 .pio_mask = 0x1f,
 430                 .mwdma_mask = 0x07,
 431                 .udma_mask = ATA_UDMA2,
 432                 .port_ops = &via_port_ops
 433         };
 434         /* VIA UDMA 66 devices */
 435         static const struct ata_port_info via_udma66_info = {
 436                 .flags = ATA_FLAG_SLAVE_POSS,
 437                 .pio_mask = 0x1f,
 438                 .mwdma_mask = 0x07,
 439                 .udma_mask = ATA_UDMA4,
 440                 .port_ops = &via_port_ops
 441         };
 442         /* VIA UDMA 100 devices */
 443         static const struct ata_port_info via_udma100_info = {
 444                 .flags = ATA_FLAG_SLAVE_POSS,
 445                 .pio_mask = 0x1f,
 446                 .mwdma_mask = 0x07,
 447                 .udma_mask = ATA_UDMA5,
 448                 .port_ops = &via_port_ops
 449         };
 450         /* UDMA133 with bad AST (All current 133) */
 451         static const struct ata_port_info via_udma133_info = {
 452                 .flags = ATA_FLAG_SLAVE_POSS,
 453                 .pio_mask = 0x1f,
 454                 .mwdma_mask = 0x07,
 455                 .udma_mask = ATA_UDMA6, /* FIXME: should check north bridge */
 456                 .port_ops = &via_port_ops
 457         };
 458         const struct ata_port_info *ppi[] = { NULL, NULL };
 459         struct pci_dev *isa = NULL;
 460         const struct via_isa_bridge *config;
 461         static int printed_version;
 462         u8 enable;
 463         u32 timing;
 464         int rc;
 465
 466         if (!printed_version++)
 467                 dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
 468
 469         rc = pcim_enable_device(pdev);
 470         if (rc)
 471                 return rc;
 472
 473         /* To find out how the IDE will behave and what features we
 474            actually have to look at the bridge not the IDE controller */
 475         for (config = via_isa_bridges; config->id; config++)
 476                 if ((isa = pci_get_device(PCI_VENDOR_ID_VIA +
 477                         !!(config->flags & VIA_BAD_ID),
 478                         config->id, NULL))) {
 479
 480                         if (isa->revision >= config->rev_min &&
 481                             isa->revision <= config->rev_max)
 482                                 break;
 483                         pci_dev_put(isa);
 484                 }
 485
 486         if (!config->id) {
 487                 printk(KERN_WARNING "via: Unknown VIA SouthBridge, disabling.\n");
 488                 return -ENODEV;
 489         }
 490         pci_dev_put(isa);
 491
 492         if (!(config->flags & VIA_NO_ENABLES)) {
 493                 /* 0x40 low bits indicate enabled channels */
 494                 pci_read_config_byte(pdev, 0x40 , &enable);
 495                 enable &= 3;
 496                 if (enable == 0)
 497                         return -ENODEV;
 498         }
 499
 500         /* Initialise the FIFO for the enabled channels. */
 501         via_config_fifo(pdev, config->flags);
 502
 503         /* Clock set up */
 504         switch(config->flags & VIA_UDMA) {
 505                 case VIA_UDMA_NONE:
 506                         if (config->flags & VIA_NO_UNMASK)
 507                                 ppi[0] = &via_mwdma_info_borked;
 508                         else
 509                                 ppi[0] = &via_mwdma_info;
 510                         break;
 511                 case VIA_UDMA_33:
 512                         ppi[0] = &via_udma33_info;
 513                         break;
 514                 case VIA_UDMA_66:
 515                         ppi[0] = &via_udma66_info;
 516                         /* The 66 MHz devices require we enable the clock */
 517                         pci_read_config_dword(pdev, 0x50, &timing);
 518                         timing |= 0x80008;
 519                         pci_write_config_dword(pdev, 0x50, timing);
 520                         break;
 521                 case VIA_UDMA_100:
 522                         ppi[0] = &via_udma100_info;
 523                         break;
 524                 case VIA_UDMA_133:
 525                         ppi[0] = &via_udma133_info;
 526                         break;
 527                 default:
 528                         WARN_ON(1);
 529                         return -ENODEV;
 530         }
 531
 532         if (config->flags & VIA_BAD_CLK66) {
 533                 /* Disable the 66MHz clock on problem devices */
 534                 pci_read_config_dword(pdev, 0x50, &timing);
 535                 timing &= ~0x80008;
 536                 pci_write_config_dword(pdev, 0x50, timing);
 537         }
 538
 539         /* We have established the device type, now fire it up */
 540         return ata_pci_sff_init_one(pdev, ppi, &via_sht, (void *)config);
 541 }
 542
 543 #ifdef CONFIG_PM
 544 /**
 545  *      via_reinit_one          -       reinit after resume
 546  *      @pdev; PCI device
 547  *
 548  *      Called when the VIA PATA device is resumed. We must then
 549  *      reconfigure the fifo and other setup we may have altered. In
 550  *      addition the kernel needs to have the resume methods on PCI
 551  *      quirk supported.
 552  */
 553
 554 static int via_reinit_one(struct pci_dev *pdev)
 555 {
 556         u32 timing;
 557         struct ata_host *host = dev_get_drvdata(&pdev->dev);
 558         const struct via_isa_bridge *config = host->private_data;
 559         int rc;
 560
 561         rc = ata_pci_device_do_resume(pdev);
 562         if (rc)
 563                 return rc;
 564
 565         via_config_fifo(pdev, config->flags);
 566
 567         if ((config->flags & VIA_UDMA) == VIA_UDMA_66) {
 568                 /* The 66 MHz devices require we enable the clock */
 569                 pci_read_config_dword(pdev, 0x50, &timing);
 570                 timing |= 0x80008;
 571                 pci_write_config_dword(pdev, 0x50, timing);
 572         }
 573         if (config->flags & VIA_BAD_CLK66) {
 574                 /* Disable the 66MHz clock on problem devices */
 575                 pci_read_config_dword(pdev, 0x50, &timing);
 576                 timing &= ~0x80008;
 577                 pci_write_config_dword(pdev, 0x50, timing);
 578         }
 579
 580         ata_host_resume(host);
 581         return 0;
 582 }
 583 #endif
 584
 585 static const struct pci_device_id via[] = {
 586         { PCI_VDEVICE(VIA, 0x0571), },
 587         { PCI_VDEVICE(VIA, 0x0581), },
 588         { PCI_VDEVICE(VIA, 0x1571), },
 589         { PCI_VDEVICE(VIA, 0x3164), },
 590         { PCI_VDEVICE(VIA, 0x5324), },
 591
 592         { },
 593 };
 594
 595 static struct pci_driver via_pci_driver = {
 596         .name           = DRV_NAME,
 597         .id_table       = via,
 598         .probe          = via_init_one,
 599         .remove         = ata_pci_remove_one,
 600 #ifdef CONFIG_PM
 601         .suspend        = ata_pci_device_suspend,
 602         .resume         = via_reinit_one,
 603 #endif
 604 };
 605
 606 static int __init via_init(void)
 607 {
 608         return pci_register_driver(&via_pci_driver);
 609 }
 610
 611 static void __exit via_exit(void)
 612 {
 613         pci_unregister_driver(&via_pci_driver);
 614 }
 615
 616 MODULE_AUTHOR("Alan Cox");
 617 MODULE_DESCRIPTION("low-level driver for VIA PATA");
 618 MODULE_LICENSE("GPL");
 619 MODULE_DEVICE_TABLE(pci, via);
 620 MODULE_VERSION(DRV_VERSION);
 621
 622 module_init(via_init);
 623 module_exit(via_exit);