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  *
  27  *      Most registers remain compatible across chips. Others start reserved
  28  *      and acquire sensible semantics if set to 1 (eg cable detect). A few
  29  *      exceptions exist, notably around the FIFO settings.
  30  *
  31  *      One additional quirk of the VIA design is that like ALi they use few
  32  *      PCI IDs for a lot of chips.
  33  *
  34  *      Based heavily on:
  35  *
  36  * Version 3.38
  37  *
  38  * VIA IDE driver for Linux. Supported southbridges:
  39  *
  40  *   vt82c576, vt82c586, vt82c586a, vt82c586b, vt82c596a, vt82c596b,
  41  *   vt82c686, vt82c686a, vt82c686b, vt8231, vt8233, vt8233c, vt8233a,
  42  *   vt8235, vt8237
  43  *
  44  * Copyright (c) 2000-2002 Vojtech Pavlik
  45  *
  46  * Based on the work of:
  47  *      Michel Aubry
  48  *      Jeff Garzik
  49  *      Andre Hedrick
  50
  51  */
  52
  53 #include <linux/kernel.h>
  54 #include <linux/module.h>
  55 #include <linux/pci.h>
  56 #include <linux/init.h>
  57 #include <linux/blkdev.h>
  58 #include <linux/delay.h>
  59 #include <scsi/scsi_host.h>
  60 #include <linux/libata.h>
  61
  62 #define DRV_NAME "pata_via"
  63 #define DRV_VERSION "0.1.14"
  64
  65 /*
  66  *      The following comes directly from Vojtech Pavlik's ide/pci/via82cxxx
  67  *      driver.
  68  */
  69
  70 enum {
  71         VIA_UDMA        = 0x007,
  72         VIA_UDMA_NONE   = 0x000,
  73         VIA_UDMA_33     = 0x001,
  74         VIA_UDMA_66     = 0x002,
  75         VIA_UDMA_100    = 0x003,
  76         VIA_UDMA_133    = 0x004,
  77         VIA_BAD_PREQ    = 0x010, /* Crashes if PREQ# till DDACK# set */
  78         VIA_BAD_CLK66   = 0x020, /* 66 MHz clock doesn't work correctly */
  79         VIA_SET_FIFO    = 0x040, /* Needs to have FIFO split set */
  80         VIA_NO_UNMASK   = 0x080, /* Doesn't work with IRQ unmasking on */
  81         VIA_BAD_ID      = 0x100, /* Has wrong vendor ID (0x1107) */
  82         VIA_BAD_AST     = 0x200, /* Don't touch Address Setup Timing */
  83         VIA_NO_ENABLES  = 0x400, /* Has no enablebits */
  84 };
  85
  86 /*
  87  * VIA SouthBridge chips.
  88  */
  89
  90 static const struct via_isa_bridge {
  91         const char *name;
  92         u16 id;
  93         u8 rev_min;
  94         u8 rev_max;
  95         u16 flags;
  96 } via_isa_bridges[] = {
  97         { "cx700",      PCI_DEVICE_ID_VIA_CX700,    0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
  98         { "vt6410",     PCI_DEVICE_ID_VIA_6410,     0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST | VIA_NO_ENABLES},
  99         { "vt8237a",    PCI_DEVICE_ID_VIA_8237A,    0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
 100         { "vt8237",     PCI_DEVICE_ID_VIA_8237,     0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
 101         { "vt8235",     PCI_DEVICE_ID_VIA_8235,     0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
 102         { "vt8233a",    PCI_DEVICE_ID_VIA_8233A,    0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
 103         { "vt8233c",    PCI_DEVICE_ID_VIA_8233C_0,  0x00, 0x2f, VIA_UDMA_100 },
 104         { "vt8233",     PCI_DEVICE_ID_VIA_8233_0,   0x00, 0x2f, VIA_UDMA_100 },
 105         { "vt8231",     PCI_DEVICE_ID_VIA_8231,     0x00, 0x2f, VIA_UDMA_100 },
 106         { "vt82c686b",  PCI_DEVICE_ID_VIA_82C686,   0x40, 0x4f, VIA_UDMA_100 },
 107         { "vt82c686a",  PCI_DEVICE_ID_VIA_82C686,   0x10, 0x2f, VIA_UDMA_66 },
 108         { "vt82c686",   PCI_DEVICE_ID_VIA_82C686,   0x00, 0x0f, VIA_UDMA_33 | VIA_BAD_CLK66 },
 109         { "vt82c596b",  PCI_DEVICE_ID_VIA_82C596,   0x10, 0x2f, VIA_UDMA_66 },
 110         { "vt82c596a",  PCI_DEVICE_ID_VIA_82C596,   0x00, 0x0f, VIA_UDMA_33 | VIA_BAD_CLK66 },
 111         { "vt82c586b",  PCI_DEVICE_ID_VIA_82C586_0, 0x47, 0x4f, VIA_UDMA_33 | VIA_SET_FIFO },
 112         { "vt82c586b",  PCI_DEVICE_ID_VIA_82C586_0, 0x40, 0x46, VIA_UDMA_33 | VIA_SET_FIFO | VIA_BAD_PREQ },
 113         { "vt82c586b",  PCI_DEVICE_ID_VIA_82C586_0, 0x30, 0x3f, VIA_UDMA_33 | VIA_SET_FIFO },
 114         { "vt82c586a",  PCI_DEVICE_ID_VIA_82C586_0, 0x20, 0x2f, VIA_UDMA_33 | VIA_SET_FIFO },
 115         { "vt82c586",   PCI_DEVICE_ID_VIA_82C586_0, 0x00, 0x0f, VIA_UDMA_NONE | VIA_SET_FIFO },
 116         { "vt82c576",   PCI_DEVICE_ID_VIA_82C576,   0x00, 0x2f, VIA_UDMA_NONE | VIA_SET_FIFO | VIA_NO_UNMASK },
 117         { "vt82c576",   PCI_DEVICE_ID_VIA_82C576,   0x00, 0x2f, VIA_UDMA_NONE | VIA_SET_FIFO | VIA_NO_UNMASK | VIA_BAD_ID },
 118         { NULL }
 119 };
 120
 121 /**
 122  *      via_cable_detect        -       cable detection
 123  *      @ap: ATA port
 124  *
 125  *      Perform cable detection. Actually for the VIA case the BIOS
 126  *      already did this for us. We read the values provided by the
 127  *      BIOS. If you are using an 8235 in a non-PC configuration you
 128  *      may need to update this code.
 129  *
 130  *      Hotplug also impacts on this.
 131  */
 132
 133 static int via_cable_detect(struct ata_port *ap) {
 134         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 135         u32 ata66;
 136
 137         pci_read_config_dword(pdev, 0x50, &ata66);
 138         /* Check both the drive cable reporting bits, we might not have
 139            two drives */
 140         if (ata66 & (0x10100000 >> (16 * ap->port_no)))
 141                 return ATA_CBL_PATA80;
 142         else
 143                 return ATA_CBL_PATA40;
 144 }
 145
 146 static int via_pre_reset(struct ata_port *ap)
 147 {
 148         const struct via_isa_bridge *config = ap->host->private_data;
 149
 150         if (!(config->flags & VIA_NO_ENABLES)) {
 151                 static const struct pci_bits via_enable_bits[] = {
 152                         { 0x40, 1, 0x02, 0x02 },
 153                         { 0x40, 1, 0x01, 0x01 }
 154                 };
 155
 156                 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 157
 158                 if (!pci_test_config_bits(pdev, &via_enable_bits[ap->port_no]))
 159                         return -ENOENT;
 160         }
 161
 162         if ((config->flags & VIA_UDMA) >= VIA_UDMA_66)
 163                 ap->cbl = via_cable_detect(ap);
 164         else
 165                 ap->cbl = ATA_CBL_PATA40;
 166         return ata_std_prereset(ap);
 167 }
 168
 169
 170 /**
 171  *      via_error_handler               -       reset for VIA chips
 172  *      @ap: ATA port
 173  *
 174  *      Handle the reset callback for the later chips with cable detect
 175  */
 176
 177 static void via_error_handler(struct ata_port *ap)
 178 {
 179         ata_bmdma_drive_eh(ap, via_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
 180 }
 181
 182 /**
 183  *      via_do_set_mode -       set initial PIO mode data
 184  *      @ap: ATA interface
 185  *      @adev: ATA device
 186  *      @mode: ATA mode being programmed
 187  *      @tdiv: Clocks per PCI clock
 188  *      @set_ast: Set to program address setup
 189  *      @udma_type: UDMA mode/format of registers
 190  *
 191  *      Program the VIA registers for DMA and PIO modes. Uses the ata timing
 192  *      support in order to compute modes.
 193  *
 194  *      FIXME: Hotplug will require we serialize multiple mode changes
 195  *      on the two channels.
 196  */
 197
 198 static void via_do_set_mode(struct ata_port *ap, struct ata_device *adev, int mode, int tdiv, int set_ast, int udma_type)
 199 {
 200         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 201         struct ata_device *peer = ata_dev_pair(adev);
 202         struct ata_timing t, p;
 203         static int via_clock = 33333;   /* Bus clock in kHZ - ought to be tunable one day */
 204         unsigned long T =  1000000000 / via_clock;
 205         unsigned long UT = T/tdiv;
 206         int ut;
 207         int offset = 3 - (2*ap->port_no) - adev->devno;
 208
 209
 210         /* Calculate the timing values we require */
 211         ata_timing_compute(adev, mode, &t, T, UT);
 212
 213         /* We share 8bit timing so we must merge the constraints */
 214         if (peer) {
 215                 if (peer->pio_mode) {
 216                         ata_timing_compute(peer, peer->pio_mode, &p, T, UT);
 217                         ata_timing_merge(&p, &t, &t, ATA_TIMING_8BIT);
 218                 }
 219         }
 220
 221         /* Address setup is programmable but breaks on UDMA133 setups */
 222         if (set_ast) {
 223                 u8 setup;       /* 2 bits per drive */
 224                 int shift = 2 * offset;
 225
 226                 pci_read_config_byte(pdev, 0x4C, &setup);
 227                 setup &= ~(3 << shift);
 228                 setup |= FIT(t.setup, 1, 4) << shift;   /* 1,4 or 1,4 - 1  FIXME */
 229                 pci_write_config_byte(pdev, 0x4C, setup);
 230         }
 231
 232         /* Load the PIO mode bits */
 233         pci_write_config_byte(pdev, 0x4F - ap->port_no,
 234                 ((FIT(t.act8b, 1, 16) - 1) << 4) | (FIT(t.rec8b, 1, 16) - 1));
 235         pci_write_config_byte(pdev, 0x48 + offset,
 236                 ((FIT(t.active, 1, 16) - 1) << 4) | (FIT(t.recover, 1, 16) - 1));
 237
 238         /* Load the UDMA bits according to type */
 239         switch(udma_type) {
 240                 default:
 241                         /* BUG() ? */
 242                         /* fall through */
 243                 case 33:
 244                         ut = t.udma ? (0xe0 | (FIT(t.udma, 2, 5) - 2)) : 0x03;
 245                         break;
 246                 case 66:
 247                         ut = t.udma ? (0xe8 | (FIT(t.udma, 2, 9) - 2)) : 0x0f;
 248                         break;
 249                 case 100:
 250                         ut = t.udma ? (0xe0 | (FIT(t.udma, 2, 9) - 2)) : 0x07;
 251                         break;
 252                 case 133:
 253                         ut = t.udma ? (0xe0 | (FIT(t.udma, 2, 9) - 2)) : 0x07;
 254                         break;
 255         }
 256         /* Set UDMA unless device is not UDMA capable */
 257         if (udma_type)
 258                 pci_write_config_byte(pdev, 0x50 + offset, ut);
 259 }
 260
 261 static void via_set_piomode(struct ata_port *ap, struct ata_device *adev)
 262 {
 263         const struct via_isa_bridge *config = ap->host->private_data;
 264         int set_ast = (config->flags & VIA_BAD_AST) ? 0 : 1;
 265         int mode = config->flags & VIA_UDMA;
 266         static u8 tclock[5] = { 1, 1, 2, 3, 4 };
 267         static u8 udma[5] = { 0, 33, 66, 100, 133 };
 268
 269         via_do_set_mode(ap, adev, adev->pio_mode, tclock[mode], set_ast, udma[mode]);
 270 }
 271
 272 static void via_set_dmamode(struct ata_port *ap, struct ata_device *adev)
 273 {
 274         const struct via_isa_bridge *config = ap->host->private_data;
 275         int set_ast = (config->flags & VIA_BAD_AST) ? 0 : 1;
 276         int mode = config->flags & VIA_UDMA;
 277         static u8 tclock[5] = { 1, 1, 2, 3, 4 };
 278         static u8 udma[5] = { 0, 33, 66, 100, 133 };
 279
 280         via_do_set_mode(ap, adev, adev->dma_mode, tclock[mode], set_ast, udma[mode]);
 281 }
 282
 283 static struct scsi_host_template via_sht = {
 284         .module                 = THIS_MODULE,
 285         .name                   = DRV_NAME,
 286         .ioctl                  = ata_scsi_ioctl,
 287         .queuecommand           = ata_scsi_queuecmd,
 288         .can_queue              = ATA_DEF_QUEUE,
 289         .this_id                = ATA_SHT_THIS_ID,
 290         .sg_tablesize           = LIBATA_MAX_PRD,
 291         .max_sectors            = ATA_MAX_SECTORS,
 292         .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,
 293         .emulated               = ATA_SHT_EMULATED,
 294         .use_clustering         = ATA_SHT_USE_CLUSTERING,
 295         .proc_name              = DRV_NAME,
 296         .dma_boundary           = ATA_DMA_BOUNDARY,
 297         .slave_configure        = ata_scsi_slave_config,
 298         .bios_param             = ata_std_bios_param,
 299 };
 300
 301 static struct ata_port_operations via_port_ops = {
 302         .port_disable   = ata_port_disable,
 303         .set_piomode    = via_set_piomode,
 304         .set_dmamode    = via_set_dmamode,
 305         .mode_filter    = ata_pci_default_filter,
 306
 307         .tf_load        = ata_tf_load,
 308         .tf_read        = ata_tf_read,
 309         .check_status   = ata_check_status,
 310         .exec_command   = ata_exec_command,
 311         .dev_select     = ata_std_dev_select,
 312
 313         .freeze         = ata_bmdma_freeze,
 314         .thaw           = ata_bmdma_thaw,
 315         .error_handler  = via_error_handler,
 316         .post_internal_cmd = ata_bmdma_post_internal_cmd,
 317
 318         .bmdma_setup    = ata_bmdma_setup,
 319         .bmdma_start    = ata_bmdma_start,
 320         .bmdma_stop     = ata_bmdma_stop,
 321         .bmdma_status   = ata_bmdma_status,
 322
 323         .qc_prep        = ata_qc_prep,
 324         .qc_issue       = ata_qc_issue_prot,
 325
 326         .data_xfer      = ata_pio_data_xfer,
 327
 328         .irq_handler    = ata_interrupt,
 329         .irq_clear      = ata_bmdma_irq_clear,
 330
 331         .port_start     = ata_port_start,
 332         .port_stop      = ata_port_stop,
 333         .host_stop      = ata_host_stop
 334 };
 335
 336 static struct ata_port_operations via_port_ops_noirq = {
 337         .port_disable   = ata_port_disable,
 338         .set_piomode    = via_set_piomode,
 339         .set_dmamode    = via_set_dmamode,
 340         .mode_filter    = ata_pci_default_filter,
 341
 342         .tf_load        = ata_tf_load,
 343         .tf_read        = ata_tf_read,
 344         .check_status   = ata_check_status,
 345         .exec_command   = ata_exec_command,
 346         .dev_select     = ata_std_dev_select,
 347
 348         .freeze         = ata_bmdma_freeze,
 349         .thaw           = ata_bmdma_thaw,
 350         .error_handler  = via_error_handler,
 351         .post_internal_cmd = ata_bmdma_post_internal_cmd,
 352
 353         .bmdma_setup    = ata_bmdma_setup,
 354         .bmdma_start    = ata_bmdma_start,
 355         .bmdma_stop     = ata_bmdma_stop,
 356         .bmdma_status   = ata_bmdma_status,
 357
 358         .qc_prep        = ata_qc_prep,
 359         .qc_issue       = ata_qc_issue_prot,
 360
 361         .data_xfer      = ata_pio_data_xfer_noirq,
 362
 363         .irq_handler    = ata_interrupt,
 364         .irq_clear      = ata_bmdma_irq_clear,
 365
 366         .port_start     = ata_port_start,
 367         .port_stop      = ata_port_stop,
 368         .host_stop      = ata_host_stop
 369 };
 370
 371 /**
 372  *      via_init_one            -       discovery callback
 373  *      @pdev: PCI device ID
 374  *      @id: PCI table info
 375  *
 376  *      A VIA IDE interface has been discovered. Figure out what revision
 377  *      and perform configuration work before handing it to the ATA layer
 378  */
 379
 380 static int via_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
 381 {
 382         /* Early VIA without UDMA support */
 383         static struct ata_port_info via_mwdma_info = {
 384                 .sht = &via_sht,
 385                 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
 386                 .pio_mask = 0x1f,
 387                 .mwdma_mask = 0x07,
 388                 .port_ops = &via_port_ops
 389         };
 390         /* Ditto with IRQ masking required */
 391         static struct ata_port_info via_mwdma_info_borked = {
 392                 .sht = &via_sht,
 393                 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
 394                 .pio_mask = 0x1f,
 395                 .mwdma_mask = 0x07,
 396                 .port_ops = &via_port_ops_noirq,
 397         };
 398         /* VIA UDMA 33 devices (and borked 66) */
 399         static struct ata_port_info via_udma33_info = {
 400                 .sht = &via_sht,
 401                 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
 402                 .pio_mask = 0x1f,
 403                 .mwdma_mask = 0x07,
 404                 .udma_mask = 0x7,
 405                 .port_ops = &via_port_ops
 406         };
 407         /* VIA UDMA 66 devices */
 408         static struct ata_port_info via_udma66_info = {
 409                 .sht = &via_sht,
 410                 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
 411                 .pio_mask = 0x1f,
 412                 .mwdma_mask = 0x07,
 413                 .udma_mask = 0x1f,
 414                 .port_ops = &via_port_ops
 415         };
 416         /* VIA UDMA 100 devices */
 417         static struct ata_port_info via_udma100_info = {
 418                 .sht = &via_sht,
 419                 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
 420                 .pio_mask = 0x1f,
 421                 .mwdma_mask = 0x07,
 422                 .udma_mask = 0x3f,
 423                 .port_ops = &via_port_ops
 424         };
 425         /* UDMA133 with bad AST (All current 133) */
 426         static struct ata_port_info via_udma133_info = {
 427                 .sht = &via_sht,
 428                 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
 429                 .pio_mask = 0x1f,
 430                 .mwdma_mask = 0x07,
 431                 .udma_mask = 0x7f,      /* FIXME: should check north bridge */
 432                 .port_ops = &via_port_ops
 433         };
 434         struct ata_port_info *port_info[2], *type;
 435         struct pci_dev *isa = NULL;
 436         const struct via_isa_bridge *config;
 437         static int printed_version;
 438         u8 t;
 439         u8 enable;
 440         u32 timing;
 441
 442         if (!printed_version++)
 443                 dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
 444
 445         /* To find out how the IDE will behave and what features we
 446            actually have to look at the bridge not the IDE controller */
 447         for (config = via_isa_bridges; config->id; config++)
 448                 if ((isa = pci_get_device(PCI_VENDOR_ID_VIA +
 449                         !!(config->flags & VIA_BAD_ID),
 450                         config->id, NULL))) {
 451
 452                         pci_read_config_byte(isa, PCI_REVISION_ID, &t);
 453                         if (t >= config->rev_min &&
 454                             t <= config->rev_max)
 455                                 break;
 456                         pci_dev_put(isa);
 457                 }
 458
 459         if (!config->id) {
 460                 printk(KERN_WARNING "via: Unknown VIA SouthBridge, disabling.\n");
 461                 return -ENODEV;
 462         }
 463         pci_dev_put(isa);
 464
 465         /* 0x40 low bits indicate enabled channels */
 466         pci_read_config_byte(pdev, 0x40 , &enable);
 467         enable &= 3;
 468         if (enable == 0) {
 469                 return -ENODEV;
 470         }
 471
 472         /* Initialise the FIFO for the enabled channels. */
 473         if (config->flags & VIA_SET_FIFO) {
 474                 u8 fifo_setting[4] = {0x00, 0x60, 0x00, 0x20};
 475                 u8 fifo;
 476
 477                 pci_read_config_byte(pdev, 0x43, &fifo);
 478
 479                 /* Clear PREQ# until DDACK# for errata */
 480                 if (config->flags & VIA_BAD_PREQ)
 481                         fifo &= 0x7F;
 482                 else
 483                         fifo &= 0x9f;
 484                 /* Turn on FIFO for enabled channels */
 485                 fifo |= fifo_setting[enable];
 486                 pci_write_config_byte(pdev, 0x43, fifo);
 487         }
 488         /* Clock set up */
 489         switch(config->flags & VIA_UDMA) {
 490                 case VIA_UDMA_NONE:
 491                         if (config->flags & VIA_NO_UNMASK)
 492                                 type = &via_mwdma_info_borked;
 493                         else
 494                                 type = &via_mwdma_info;
 495                         break;
 496                 case VIA_UDMA_33:
 497                         type = &via_udma33_info;
 498                         break;
 499                 case VIA_UDMA_66:
 500                         type = &via_udma66_info;
 501                         /* The 66 MHz devices require we enable the clock */
 502                         pci_read_config_dword(pdev, 0x50, &timing);
 503                         timing |= 0x80008;
 504                         pci_write_config_dword(pdev, 0x50, timing);
 505                         break;
 506                 case VIA_UDMA_100:
 507                         type = &via_udma100_info;
 508                         break;
 509                 case VIA_UDMA_133:
 510                         type = &via_udma133_info;
 511                         break;
 512                 default:
 513                         WARN_ON(1);
 514                         return -ENODEV;
 515         }
 516
 517         if (config->flags & VIA_BAD_CLK66) {
 518                 /* Disable the 66MHz clock on problem devices */
 519                 pci_read_config_dword(pdev, 0x50, &timing);
 520                 timing &= ~0x80008;
 521                 pci_write_config_dword(pdev, 0x50, timing);
 522         }
 523
 524         /* We have established the device type, now fire it up */
 525         type->private_data = (void *)config;
 526
 527         port_info[0] = port_info[1] = type;
 528         return ata_pci_init_one(pdev, port_info, 2);
 529 }
 530
 531 static const struct pci_device_id via[] = {
 532         { PCI_VDEVICE(VIA, PCI_DEVICE_ID_VIA_82C576_1), },
 533         { PCI_VDEVICE(VIA, PCI_DEVICE_ID_VIA_82C586_1), },
 534         { PCI_VDEVICE(VIA, PCI_DEVICE_ID_VIA_6410), },
 535         { PCI_VDEVICE(VIA, PCI_DEVICE_ID_VIA_SATA_EIDE), },
 536
 537         { },
 538 };
 539
 540 static struct pci_driver via_pci_driver = {
 541         .name           = DRV_NAME,
 542         .id_table       = via,
 543         .probe          = via_init_one,
 544         .remove         = ata_pci_remove_one
 545 };
 546
 547 static int __init via_init(void)
 548 {
 549         return pci_register_driver(&via_pci_driver);
 550 }
 551
 552 static void __exit via_exit(void)
 553 {
 554         pci_unregister_driver(&via_pci_driver);
 555 }
 556
 557 MODULE_AUTHOR("Alan Cox");
 558 MODULE_DESCRIPTION("low-level driver for VIA PATA");
 559 MODULE_LICENSE("GPL");
 560 MODULE_DEVICE_TABLE(pci, via);
 561 MODULE_VERSION(DRV_VERSION);
 562
 563 module_init(via_init);
 564 module_exit(via_exit);