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 "0.3.2"
  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 };
  88
  89 /*
  90  * VIA SouthBridge chips.
  91  */
  92
  93 static const struct via_isa_bridge {
  94         const char *name;
  95         u16 id;
  96         u8 rev_min;
  97         u8 rev_max;
  98         u16 flags;
  99 } via_isa_bridges[] = {
 100         { "vx800",      PCI_DEVICE_ID_VIA_VX800,    0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
 101         { "vt8237s",    PCI_DEVICE_ID_VIA_8237S,    0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
 102         { "vt8251",     PCI_DEVICE_ID_VIA_8251,     0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
 103         { "cx700",      PCI_DEVICE_ID_VIA_CX700,    0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
 104         { "vt6410",     PCI_DEVICE_ID_VIA_6410,     0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST | VIA_NO_ENABLES},
 105         { "vt8237a",    PCI_DEVICE_ID_VIA_8237A,    0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
 106         { "vt8237",     PCI_DEVICE_ID_VIA_8237,     0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
 107         { "vt8235",     PCI_DEVICE_ID_VIA_8235,     0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
 108         { "vt8233a",    PCI_DEVICE_ID_VIA_8233A,    0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
 109         { "vt8233c",    PCI_DEVICE_ID_VIA_8233C_0,  0x00, 0x2f, VIA_UDMA_100 },
 110         { "vt8233",     PCI_DEVICE_ID_VIA_8233_0,   0x00, 0x2f, VIA_UDMA_100 },
 111         { "vt8231",     PCI_DEVICE_ID_VIA_8231,     0x00, 0x2f, VIA_UDMA_100 },
 112         { "vt82c686b",  PCI_DEVICE_ID_VIA_82C686,   0x40, 0x4f, VIA_UDMA_100 },
 113         { "vt82c686a",  PCI_DEVICE_ID_VIA_82C686,   0x10, 0x2f, VIA_UDMA_66 },
 114         { "vt82c686",   PCI_DEVICE_ID_VIA_82C686,   0x00, 0x0f, VIA_UDMA_33 | VIA_BAD_CLK66 },
 115         { "vt82c596b",  PCI_DEVICE_ID_VIA_82C596,   0x10, 0x2f, VIA_UDMA_66 },
 116         { "vt82c596a",  PCI_DEVICE_ID_VIA_82C596,   0x00, 0x0f, VIA_UDMA_33 | VIA_BAD_CLK66 },
 117         { "vt82c586b",  PCI_DEVICE_ID_VIA_82C586_0, 0x47, 0x4f, VIA_UDMA_33 | VIA_SET_FIFO },
 118         { "vt82c586b",  PCI_DEVICE_ID_VIA_82C586_0, 0x40, 0x46, VIA_UDMA_33 | VIA_SET_FIFO | VIA_BAD_PREQ },
 119         { "vt82c586b",  PCI_DEVICE_ID_VIA_82C586_0, 0x30, 0x3f, VIA_UDMA_33 | VIA_SET_FIFO },
 120         { "vt82c586a",  PCI_DEVICE_ID_VIA_82C586_0, 0x20, 0x2f, VIA_UDMA_33 | VIA_SET_FIFO },
 121         { "vt82c586",   PCI_DEVICE_ID_VIA_82C586_0, 0x00, 0x0f, VIA_UDMA_NONE | VIA_SET_FIFO },
 122         { "vt82c576",   PCI_DEVICE_ID_VIA_82C576,   0x00, 0x2f, VIA_UDMA_NONE | VIA_SET_FIFO | VIA_NO_UNMASK },
 123         { "vt82c576",   PCI_DEVICE_ID_VIA_82C576,   0x00, 0x2f, VIA_UDMA_NONE | VIA_SET_FIFO | VIA_NO_UNMASK | VIA_BAD_ID },
 124         { NULL }
 125 };
 126
 127
 128 /*
 129  *      Cable special cases
 130  */
 131
 132 static const struct dmi_system_id cable_dmi_table[] = {
 133         {
 134                 .ident = "Acer Ferrari 3400",
 135                 .matches = {
 136                         DMI_MATCH(DMI_BOARD_VENDOR, "Acer,Inc."),
 137                         DMI_MATCH(DMI_BOARD_NAME, "Ferrari 3400"),
 138                 },
 139         },
 140         { }
 141 };
 142
 143 static int via_cable_override(struct pci_dev *pdev)
 144 {
 145         /* Systems by DMI */
 146         if (dmi_check_system(cable_dmi_table))
 147                 return 1;
 148         /* Arima W730-K8/Targa Visionary 811/... */
 149         if (pdev->subsystem_vendor == 0x161F && pdev->subsystem_device == 0x2032)
 150                 return 1;
 151         return 0;
 152 }
 153
 154
 155 /**
 156  *      via_cable_detect        -       cable detection
 157  *      @ap: ATA port
 158  *
 159  *      Perform cable detection. Actually for the VIA case the BIOS
 160  *      already did this for us. We read the values provided by the
 161  *      BIOS. If you are using an 8235 in a non-PC configuration you
 162  *      may need to update this code.
 163  *
 164  *      Hotplug also impacts on this.
 165  */
 166
 167 static int via_cable_detect(struct ata_port *ap) {
 168         const struct via_isa_bridge *config = ap->host->private_data;
 169         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 170         u32 ata66;
 171
 172         if (via_cable_override(pdev))
 173                 return ATA_CBL_PATA40_SHORT;
 174
 175         /* Early chips are 40 wire */
 176         if ((config->flags & VIA_UDMA) < VIA_UDMA_66)
 177                 return ATA_CBL_PATA40;
 178         /* UDMA 66 chips have only drive side logic */
 179         else if((config->flags & VIA_UDMA) < VIA_UDMA_100)
 180                 return ATA_CBL_PATA_UNK;
 181         /* UDMA 100 or later */
 182         pci_read_config_dword(pdev, 0x50, &ata66);
 183         /* Check both the drive cable reporting bits, we might not have
 184            two drives */
 185         if (ata66 & (0x10100000 >> (16 * ap->port_no)))
 186                 return ATA_CBL_PATA80;
 187         /* Check with ACPI so we can spot BIOS reported SATA bridges */
 188         if (ata_acpi_cbl_80wire(ap))
 189                 return ATA_CBL_PATA80;
 190         return ATA_CBL_PATA40;
 191 }
 192
 193 static int via_pre_reset(struct ata_link *link, unsigned long deadline)
 194 {
 195         struct ata_port *ap = link->ap;
 196         const struct via_isa_bridge *config = ap->host->private_data;
 197
 198         if (!(config->flags & VIA_NO_ENABLES)) {
 199                 static const struct pci_bits via_enable_bits[] = {
 200                         { 0x40, 1, 0x02, 0x02 },
 201                         { 0x40, 1, 0x01, 0x01 }
 202                 };
 203                 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 204                 if (!pci_test_config_bits(pdev, &via_enable_bits[ap->port_no]))
 205                         return -ENOENT;
 206         }
 207
 208         return ata_std_prereset(link, deadline);
 209 }
 210
 211
 212 /**
 213  *      via_error_handler               -       reset for VIA chips
 214  *      @ap: ATA port
 215  *
 216  *      Handle the reset callback for the later chips with cable detect
 217  */
 218
 219 static void via_error_handler(struct ata_port *ap)
 220 {
 221         ata_bmdma_drive_eh(ap, via_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
 222 }
 223
 224 /**
 225  *      via_do_set_mode -       set initial PIO mode data
 226  *      @ap: ATA interface
 227  *      @adev: ATA device
 228  *      @mode: ATA mode being programmed
 229  *      @tdiv: Clocks per PCI clock
 230  *      @set_ast: Set to program address setup
 231  *      @udma_type: UDMA mode/format of registers
 232  *
 233  *      Program the VIA registers for DMA and PIO modes. Uses the ata timing
 234  *      support in order to compute modes.
 235  *
 236  *      FIXME: Hotplug will require we serialize multiple mode changes
 237  *      on the two channels.
 238  */
 239
 240 static void via_do_set_mode(struct ata_port *ap, struct ata_device *adev, int mode, int tdiv, int set_ast, int udma_type)
 241 {
 242         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 243         struct ata_device *peer = ata_dev_pair(adev);
 244         struct ata_timing t, p;
 245         static int via_clock = 33333;   /* Bus clock in kHZ - ought to be tunable one day */
 246         unsigned long T =  1000000000 / via_clock;
 247         unsigned long UT = T/tdiv;
 248         int ut;
 249         int offset = 3 - (2*ap->port_no) - adev->devno;
 250
 251         /* Calculate the timing values we require */
 252         ata_timing_compute(adev, mode, &t, T, UT);
 253
 254         /* We share 8bit timing so we must merge the constraints */
 255         if (peer) {
 256                 if (peer->pio_mode) {
 257                         ata_timing_compute(peer, peer->pio_mode, &p, T, UT);
 258                         ata_timing_merge(&p, &t, &t, ATA_TIMING_8BIT);
 259                 }
 260         }
 261
 262         /* Address setup is programmable but breaks on UDMA133 setups */
 263         if (set_ast) {
 264                 u8 setup;       /* 2 bits per drive */
 265                 int shift = 2 * offset;
 266
 267                 pci_read_config_byte(pdev, 0x4C, &setup);
 268                 setup &= ~(3 << shift);
 269                 setup |= FIT(t.setup, 1, 4) << shift;   /* 1,4 or 1,4 - 1  FIXME */
 270                 pci_write_config_byte(pdev, 0x4C, setup);
 271         }
 272
 273         /* Load the PIO mode bits */
 274         pci_write_config_byte(pdev, 0x4F - ap->port_no,
 275                 ((FIT(t.act8b, 1, 16) - 1) << 4) | (FIT(t.rec8b, 1, 16) - 1));
 276         pci_write_config_byte(pdev, 0x48 + offset,
 277                 ((FIT(t.active, 1, 16) - 1) << 4) | (FIT(t.recover, 1, 16) - 1));
 278
 279         /* Load the UDMA bits according to type */
 280         switch(udma_type) {
 281                 default:
 282                         /* BUG() ? */
 283                         /* fall through */
 284                 case 33:
 285                         ut = t.udma ? (0xe0 | (FIT(t.udma, 2, 5) - 2)) : 0x03;
 286                         break;
 287                 case 66:
 288                         ut = t.udma ? (0xe8 | (FIT(t.udma, 2, 9) - 2)) : 0x0f;
 289                         break;
 290                 case 100:
 291                         ut = t.udma ? (0xe0 | (FIT(t.udma, 2, 9) - 2)) : 0x07;
 292                         break;
 293                 case 133:
 294                         ut = t.udma ? (0xe0 | (FIT(t.udma, 2, 9) - 2)) : 0x07;
 295                         break;
 296         }
 297
 298         /* Set UDMA unless device is not UDMA capable */
 299         if (udma_type) {
 300                 u8 cable80_status;
 301
 302                 /* Get 80-wire cable detection bit */
 303                 pci_read_config_byte(pdev, 0x50 + offset, &cable80_status);
 304                 cable80_status &= 0x10;
 305
 306                 pci_write_config_byte(pdev, 0x50 + offset, ut | cable80_status);
 307         }
 308 }
 309
 310 static void via_set_piomode(struct ata_port *ap, struct ata_device *adev)
 311 {
 312         const struct via_isa_bridge *config = ap->host->private_data;
 313         int set_ast = (config->flags & VIA_BAD_AST) ? 0 : 1;
 314         int mode = config->flags & VIA_UDMA;
 315         static u8 tclock[5] = { 1, 1, 2, 3, 4 };
 316         static u8 udma[5] = { 0, 33, 66, 100, 133 };
 317
 318         via_do_set_mode(ap, adev, adev->pio_mode, tclock[mode], set_ast, udma[mode]);
 319 }
 320
 321 static void via_set_dmamode(struct ata_port *ap, struct ata_device *adev)
 322 {
 323         const struct via_isa_bridge *config = ap->host->private_data;
 324         int set_ast = (config->flags & VIA_BAD_AST) ? 0 : 1;
 325         int mode = config->flags & VIA_UDMA;
 326         static u8 tclock[5] = { 1, 1, 2, 3, 4 };
 327         static u8 udma[5] = { 0, 33, 66, 100, 133 };
 328
 329         via_do_set_mode(ap, adev, adev->dma_mode, tclock[mode], set_ast, udma[mode]);
 330 }
 331
 332 static struct scsi_host_template via_sht = {
 333         .module                 = THIS_MODULE,
 334         .name                   = DRV_NAME,
 335         .ioctl                  = ata_scsi_ioctl,
 336         .queuecommand           = ata_scsi_queuecmd,
 337         .can_queue              = ATA_DEF_QUEUE,
 338         .this_id                = ATA_SHT_THIS_ID,
 339         .sg_tablesize           = LIBATA_MAX_PRD,
 340         .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,
 341         .emulated               = ATA_SHT_EMULATED,
 342         .use_clustering         = ATA_SHT_USE_CLUSTERING,
 343         .proc_name              = DRV_NAME,
 344         .dma_boundary           = ATA_DMA_BOUNDARY,
 345         .slave_configure        = ata_scsi_slave_config,
 346         .slave_destroy          = ata_scsi_slave_destroy,
 347         .bios_param             = ata_std_bios_param,
 348 };
 349
 350 static struct ata_port_operations via_port_ops = {
 351         .port_disable   = ata_port_disable,
 352         .set_piomode    = via_set_piomode,
 353         .set_dmamode    = via_set_dmamode,
 354         .mode_filter    = ata_pci_default_filter,
 355
 356         .tf_load        = ata_tf_load,
 357         .tf_read        = ata_tf_read,
 358         .check_status   = ata_check_status,
 359         .exec_command   = ata_exec_command,
 360         .dev_select     = ata_std_dev_select,
 361
 362         .freeze         = ata_bmdma_freeze,
 363         .thaw           = ata_bmdma_thaw,
 364         .error_handler  = via_error_handler,
 365         .post_internal_cmd = ata_bmdma_post_internal_cmd,
 366         .cable_detect   = via_cable_detect,
 367
 368         .bmdma_setup    = ata_bmdma_setup,
 369         .bmdma_start    = ata_bmdma_start,
 370         .bmdma_stop     = ata_bmdma_stop,
 371         .bmdma_status   = ata_bmdma_status,
 372
 373         .qc_prep        = ata_qc_prep,
 374         .qc_issue       = ata_qc_issue_prot,
 375
 376         .data_xfer      = ata_data_xfer,
 377
 378         .irq_handler    = ata_interrupt,
 379         .irq_clear      = ata_bmdma_irq_clear,
 380         .irq_on         = ata_irq_on,
 381
 382         .port_start     = ata_port_start,
 383 };
 384
 385 static struct ata_port_operations via_port_ops_noirq = {
 386         .port_disable   = ata_port_disable,
 387         .set_piomode    = via_set_piomode,
 388         .set_dmamode    = via_set_dmamode,
 389         .mode_filter    = ata_pci_default_filter,
 390
 391         .tf_load        = ata_tf_load,
 392         .tf_read        = ata_tf_read,
 393         .check_status   = ata_check_status,
 394         .exec_command   = ata_exec_command,
 395         .dev_select     = ata_std_dev_select,
 396
 397         .freeze         = ata_bmdma_freeze,
 398         .thaw           = ata_bmdma_thaw,
 399         .error_handler  = via_error_handler,
 400         .post_internal_cmd = ata_bmdma_post_internal_cmd,
 401         .cable_detect   = via_cable_detect,
 402
 403         .bmdma_setup    = ata_bmdma_setup,
 404         .bmdma_start    = ata_bmdma_start,
 405         .bmdma_stop     = ata_bmdma_stop,
 406         .bmdma_status   = ata_bmdma_status,
 407
 408         .qc_prep        = ata_qc_prep,
 409         .qc_issue       = ata_qc_issue_prot,
 410
 411         .data_xfer      = ata_data_xfer_noirq,
 412
 413         .irq_handler    = ata_interrupt,
 414         .irq_clear      = ata_bmdma_irq_clear,
 415         .irq_on         = ata_irq_on,
 416
 417         .port_start     = ata_port_start,
 418 };
 419
 420 /**
 421  *      via_config_fifo         -       set up the FIFO
 422  *      @pdev: PCI device
 423  *      @flags: configuration flags
 424  *
 425  *      Set the FIFO properties for this device if neccessary. Used both on
 426  *      set up and on and the resume path
 427  */
 428
 429 static void via_config_fifo(struct pci_dev *pdev, unsigned int flags)
 430 {
 431         u8 enable;
 432
 433         /* 0x40 low bits indicate enabled channels */
 434         pci_read_config_byte(pdev, 0x40 , &enable);
 435         enable &= 3;
 436
 437         if (flags & VIA_SET_FIFO) {
 438                 static const u8 fifo_setting[4] = {0x00, 0x60, 0x00, 0x20};
 439                 u8 fifo;
 440
 441                 pci_read_config_byte(pdev, 0x43, &fifo);
 442
 443                 /* Clear PREQ# until DDACK# for errata */
 444                 if (flags & VIA_BAD_PREQ)
 445                         fifo &= 0x7F;
 446                 else
 447                         fifo &= 0x9f;
 448                 /* Turn on FIFO for enabled channels */
 449                 fifo |= fifo_setting[enable];
 450                 pci_write_config_byte(pdev, 0x43, fifo);
 451         }
 452 }
 453
 454 /**
 455  *      via_init_one            -       discovery callback
 456  *      @pdev: PCI device
 457  *      @id: PCI table info
 458  *
 459  *      A VIA IDE interface has been discovered. Figure out what revision
 460  *      and perform configuration work before handing it to the ATA layer
 461  */
 462
 463 static int via_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
 464 {
 465         /* Early VIA without UDMA support */
 466         static const struct ata_port_info via_mwdma_info = {
 467                 .sht = &via_sht,
 468                 .flags = ATA_FLAG_SLAVE_POSS,
 469                 .pio_mask = 0x1f,
 470                 .mwdma_mask = 0x07,
 471                 .port_ops = &via_port_ops
 472         };
 473         /* Ditto with IRQ masking required */
 474         static const struct ata_port_info via_mwdma_info_borked = {
 475                 .sht = &via_sht,
 476                 .flags = ATA_FLAG_SLAVE_POSS,
 477                 .pio_mask = 0x1f,
 478                 .mwdma_mask = 0x07,
 479                 .port_ops = &via_port_ops_noirq,
 480         };
 481         /* VIA UDMA 33 devices (and borked 66) */
 482         static const struct ata_port_info via_udma33_info = {
 483                 .sht = &via_sht,
 484                 .flags = ATA_FLAG_SLAVE_POSS,
 485                 .pio_mask = 0x1f,
 486                 .mwdma_mask = 0x07,
 487                 .udma_mask = ATA_UDMA2,
 488                 .port_ops = &via_port_ops
 489         };
 490         /* VIA UDMA 66 devices */
 491         static const struct ata_port_info via_udma66_info = {
 492                 .sht = &via_sht,
 493                 .flags = ATA_FLAG_SLAVE_POSS,
 494                 .pio_mask = 0x1f,
 495                 .mwdma_mask = 0x07,
 496                 .udma_mask = ATA_UDMA4,
 497                 .port_ops = &via_port_ops
 498         };
 499         /* VIA UDMA 100 devices */
 500         static const struct ata_port_info via_udma100_info = {
 501                 .sht = &via_sht,
 502                 .flags = ATA_FLAG_SLAVE_POSS,
 503                 .pio_mask = 0x1f,
 504                 .mwdma_mask = 0x07,
 505                 .udma_mask = ATA_UDMA5,
 506                 .port_ops = &via_port_ops
 507         };
 508         /* UDMA133 with bad AST (All current 133) */
 509         static const struct ata_port_info via_udma133_info = {
 510                 .sht = &via_sht,
 511                 .flags = ATA_FLAG_SLAVE_POSS,
 512                 .pio_mask = 0x1f,
 513                 .mwdma_mask = 0x07,
 514                 .udma_mask = ATA_UDMA6, /* FIXME: should check north bridge */
 515                 .port_ops = &via_port_ops
 516         };
 517         struct ata_port_info type;
 518         const struct ata_port_info *ppi[] = { &type, NULL };
 519         struct pci_dev *isa = NULL;
 520         const struct via_isa_bridge *config;
 521         static int printed_version;
 522         u8 enable;
 523         u32 timing;
 524
 525         if (!printed_version++)
 526                 dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
 527
 528         /* To find out how the IDE will behave and what features we
 529            actually have to look at the bridge not the IDE controller */
 530         for (config = via_isa_bridges; config->id; config++)
 531                 if ((isa = pci_get_device(PCI_VENDOR_ID_VIA +
 532                         !!(config->flags & VIA_BAD_ID),
 533                         config->id, NULL))) {
 534
 535                         if (isa->revision >= config->rev_min &&
 536                             isa->revision <= config->rev_max)
 537                                 break;
 538                         pci_dev_put(isa);
 539                 }
 540
 541         if (!config->id) {
 542                 printk(KERN_WARNING "via: Unknown VIA SouthBridge, disabling.\n");
 543                 return -ENODEV;
 544         }
 545         pci_dev_put(isa);
 546
 547         /* 0x40 low bits indicate enabled channels */
 548         pci_read_config_byte(pdev, 0x40 , &enable);
 549         enable &= 3;
 550         if (enable == 0) {
 551                 return -ENODEV;
 552         }
 553
 554         /* Initialise the FIFO for the enabled channels. */
 555         via_config_fifo(pdev, config->flags);
 556
 557         /* Clock set up */
 558         switch(config->flags & VIA_UDMA) {
 559                 case VIA_UDMA_NONE:
 560                         if (config->flags & VIA_NO_UNMASK)
 561                                 type = via_mwdma_info_borked;
 562                         else
 563                                 type = via_mwdma_info;
 564                         break;
 565                 case VIA_UDMA_33:
 566                         type = via_udma33_info;
 567                         break;
 568                 case VIA_UDMA_66:
 569                         type = via_udma66_info;
 570                         /* The 66 MHz devices require we enable the clock */
 571                         pci_read_config_dword(pdev, 0x50, &timing);
 572                         timing |= 0x80008;
 573                         pci_write_config_dword(pdev, 0x50, timing);
 574                         break;
 575                 case VIA_UDMA_100:
 576                         type = via_udma100_info;
 577                         break;
 578                 case VIA_UDMA_133:
 579                         type = via_udma133_info;
 580                         break;
 581                 default:
 582                         WARN_ON(1);
 583                         return -ENODEV;
 584         }
 585
 586         if (config->flags & VIA_BAD_CLK66) {
 587                 /* Disable the 66MHz clock on problem devices */
 588                 pci_read_config_dword(pdev, 0x50, &timing);
 589                 timing &= ~0x80008;
 590                 pci_write_config_dword(pdev, 0x50, timing);
 591         }
 592
 593         /* We have established the device type, now fire it up */
 594         type.private_data = (void *)config;
 595
 596         return ata_pci_init_one(pdev, ppi);
 597 }
 598
 599 #ifdef CONFIG_PM
 600 /**
 601  *      via_reinit_one          -       reinit after resume
 602  *      @pdev; PCI device
 603  *
 604  *      Called when the VIA PATA device is resumed. We must then
 605  *      reconfigure the fifo and other setup we may have altered. In
 606  *      addition the kernel needs to have the resume methods on PCI
 607  *      quirk supported.
 608  */
 609
 610 static int via_reinit_one(struct pci_dev *pdev)
 611 {
 612         u32 timing;
 613         struct ata_host *host = dev_get_drvdata(&pdev->dev);
 614         const struct via_isa_bridge *config = host->private_data;
 615
 616         via_config_fifo(pdev, config->flags);
 617
 618         if ((config->flags & VIA_UDMA) == VIA_UDMA_66) {
 619                 /* The 66 MHz devices require we enable the clock */
 620                 pci_read_config_dword(pdev, 0x50, &timing);
 621                 timing |= 0x80008;
 622                 pci_write_config_dword(pdev, 0x50, timing);
 623         }
 624         if (config->flags & VIA_BAD_CLK66) {
 625                 /* Disable the 66MHz clock on problem devices */
 626                 pci_read_config_dword(pdev, 0x50, &timing);
 627                 timing &= ~0x80008;
 628                 pci_write_config_dword(pdev, 0x50, timing);
 629         }
 630         return ata_pci_device_resume(pdev);
 631 }
 632 #endif
 633
 634 static const struct pci_device_id via[] = {
 635         { PCI_VDEVICE(VIA, 0x0571), },
 636         { PCI_VDEVICE(VIA, 0x0581), },
 637         { PCI_VDEVICE(VIA, 0x1571), },
 638         { PCI_VDEVICE(VIA, 0x3164), },
 639         { PCI_VDEVICE(VIA, 0x5324), },
 640
 641         { },
 642 };
 643
 644 static struct pci_driver via_pci_driver = {
 645         .name           = DRV_NAME,
 646         .id_table       = via,
 647         .probe          = via_init_one,
 648         .remove         = ata_pci_remove_one,
 649 #ifdef CONFIG_PM
 650         .suspend        = ata_pci_device_suspend,
 651         .resume         = via_reinit_one,
 652 #endif
 653 };
 654
 655 static int __init via_init(void)
 656 {
 657         return pci_register_driver(&via_pci_driver);
 658 }
 659
 660 static void __exit via_exit(void)
 661 {
 662         pci_unregister_driver(&via_pci_driver);
 663 }
 664
 665 MODULE_AUTHOR("Alan Cox");
 666 MODULE_DESCRIPTION("low-level driver for VIA PATA");
 667 MODULE_LICENSE("GPL");
 668 MODULE_DEVICE_TABLE(pci, via);
 669 MODULE_VERSION(DRV_VERSION);
 670
 671 module_init(via_init);
 672 module_exit(via_exit);