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
  64 #define DRV_NAME "pata_via"
  65 #define DRV_VERSION "0.2.1"
  66
  67 /*
  68  *      The following comes directly from Vojtech Pavlik's ide/pci/via82cxxx
  69  *      driver.
  70  */
  71
  72 enum {
  73         VIA_UDMA        = 0x007,
  74         VIA_UDMA_NONE   = 0x000,
  75         VIA_UDMA_33     = 0x001,
  76         VIA_UDMA_66     = 0x002,
  77         VIA_UDMA_100    = 0x003,
  78         VIA_UDMA_133    = 0x004,
  79         VIA_BAD_PREQ    = 0x010, /* Crashes if PREQ# till DDACK# set */
  80         VIA_BAD_CLK66   = 0x020, /* 66 MHz clock doesn't work correctly */
  81         VIA_SET_FIFO    = 0x040, /* Needs to have FIFO split set */
  82         VIA_NO_UNMASK   = 0x080, /* Doesn't work with IRQ unmasking on */
  83         VIA_BAD_ID      = 0x100, /* Has wrong vendor ID (0x1107) */
  84         VIA_BAD_AST     = 0x200, /* Don't touch Address Setup Timing */
  85         VIA_NO_ENABLES  = 0x400, /* Has no enablebits */
  86 };
  87
  88 /*
  89  * VIA SouthBridge chips.
  90  */
  91
  92 static const struct via_isa_bridge {
  93         const char *name;
  94         u16 id;
  95         u8 rev_min;
  96         u8 rev_max;
  97         u16 flags;
  98 } via_isa_bridges[] = {
  99         { "vt8237s",    PCI_DEVICE_ID_VIA_8237S,    0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
 100         { "vt8251",     PCI_DEVICE_ID_VIA_8251,     0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
 101         { "cx700",      PCI_DEVICE_ID_VIA_CX700,    0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
 102         { "vt6410",     PCI_DEVICE_ID_VIA_6410,     0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST | VIA_NO_ENABLES},
 103         { "vt8237a",    PCI_DEVICE_ID_VIA_8237A,    0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
 104         { "vt8237",     PCI_DEVICE_ID_VIA_8237,     0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
 105         { "vt8235",     PCI_DEVICE_ID_VIA_8235,     0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
 106         { "vt8233a",    PCI_DEVICE_ID_VIA_8233A,    0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
 107         { "vt8233c",    PCI_DEVICE_ID_VIA_8233C_0,  0x00, 0x2f, VIA_UDMA_100 },
 108         { "vt8233",     PCI_DEVICE_ID_VIA_8233_0,   0x00, 0x2f, VIA_UDMA_100 },
 109         { "vt8231",     PCI_DEVICE_ID_VIA_8231,     0x00, 0x2f, VIA_UDMA_100 },
 110         { "vt82c686b",  PCI_DEVICE_ID_VIA_82C686,   0x40, 0x4f, VIA_UDMA_100 },
 111         { "vt82c686a",  PCI_DEVICE_ID_VIA_82C686,   0x10, 0x2f, VIA_UDMA_66 },
 112         { "vt82c686",   PCI_DEVICE_ID_VIA_82C686,   0x00, 0x0f, VIA_UDMA_33 | VIA_BAD_CLK66 },
 113         { "vt82c596b",  PCI_DEVICE_ID_VIA_82C596,   0x10, 0x2f, VIA_UDMA_66 },
 114         { "vt82c596a",  PCI_DEVICE_ID_VIA_82C596,   0x00, 0x0f, VIA_UDMA_33 | VIA_BAD_CLK66 },
 115         { "vt82c586b",  PCI_DEVICE_ID_VIA_82C586_0, 0x47, 0x4f, VIA_UDMA_33 | VIA_SET_FIFO },
 116         { "vt82c586b",  PCI_DEVICE_ID_VIA_82C586_0, 0x40, 0x46, VIA_UDMA_33 | VIA_SET_FIFO | VIA_BAD_PREQ },
 117         { "vt82c586b",  PCI_DEVICE_ID_VIA_82C586_0, 0x30, 0x3f, VIA_UDMA_33 | VIA_SET_FIFO },
 118         { "vt82c586a",  PCI_DEVICE_ID_VIA_82C586_0, 0x20, 0x2f, VIA_UDMA_33 | VIA_SET_FIFO },
 119         { "vt82c586",   PCI_DEVICE_ID_VIA_82C586_0, 0x00, 0x0f, VIA_UDMA_NONE | VIA_SET_FIFO },
 120         { "vt82c576",   PCI_DEVICE_ID_VIA_82C576,   0x00, 0x2f, VIA_UDMA_NONE | VIA_SET_FIFO | VIA_NO_UNMASK },
 121         { "vt82c576",   PCI_DEVICE_ID_VIA_82C576,   0x00, 0x2f, VIA_UDMA_NONE | VIA_SET_FIFO | VIA_NO_UNMASK | VIA_BAD_ID },
 122         { NULL }
 123 };
 124
 125 /**
 126  *      via_cable_detect        -       cable detection
 127  *      @ap: ATA port
 128  *
 129  *      Perform cable detection. Actually for the VIA case the BIOS
 130  *      already did this for us. We read the values provided by the
 131  *      BIOS. If you are using an 8235 in a non-PC configuration you
 132  *      may need to update this code.
 133  *
 134  *      Hotplug also impacts on this.
 135  */
 136
 137 static int via_cable_detect(struct ata_port *ap) {
 138         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 139         u32 ata66;
 140
 141         pci_read_config_dword(pdev, 0x50, &ata66);
 142         /* Check both the drive cable reporting bits, we might not have
 143            two drives */
 144         if (ata66 & (0x10100000 >> (16 * ap->port_no)))
 145                 return ATA_CBL_PATA80;
 146         else
 147                 return ATA_CBL_PATA40;
 148 }
 149
 150 static int via_pre_reset(struct ata_port *ap)
 151 {
 152         const struct via_isa_bridge *config = ap->host->private_data;
 153
 154         if (!(config->flags & VIA_NO_ENABLES)) {
 155                 static const struct pci_bits via_enable_bits[] = {
 156                         { 0x40, 1, 0x02, 0x02 },
 157                         { 0x40, 1, 0x01, 0x01 }
 158                 };
 159
 160                 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 161
 162                 if (!pci_test_config_bits(pdev, &via_enable_bits[ap->port_no]))
 163                         return -ENOENT;
 164         }
 165
 166         if ((config->flags & VIA_UDMA) >= VIA_UDMA_100)
 167                 ap->cbl = via_cable_detect(ap);
 168         /* The UDMA66 series has no cable detect so do drive side detect */
 169         else if ((config->flags & VIA_UDMA) < VIA_UDMA_66)
 170                 ap->cbl = ATA_CBL_PATA40;
 171         else
 172                 ap->cbl = ATA_CBL_PATA_UNK;
 173
 174
 175         return ata_std_prereset(ap);
 176 }
 177
 178
 179 /**
 180  *      via_error_handler               -       reset for VIA chips
 181  *      @ap: ATA port
 182  *
 183  *      Handle the reset callback for the later chips with cable detect
 184  */
 185
 186 static void via_error_handler(struct ata_port *ap)
 187 {
 188         ata_bmdma_drive_eh(ap, via_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
 189 }
 190
 191 /**
 192  *      via_do_set_mode -       set initial PIO mode data
 193  *      @ap: ATA interface
 194  *      @adev: ATA device
 195  *      @mode: ATA mode being programmed
 196  *      @tdiv: Clocks per PCI clock
 197  *      @set_ast: Set to program address setup
 198  *      @udma_type: UDMA mode/format of registers
 199  *
 200  *      Program the VIA registers for DMA and PIO modes. Uses the ata timing
 201  *      support in order to compute modes.
 202  *
 203  *      FIXME: Hotplug will require we serialize multiple mode changes
 204  *      on the two channels.
 205  */
 206
 207 static void via_do_set_mode(struct ata_port *ap, struct ata_device *adev, int mode, int tdiv, int set_ast, int udma_type)
 208 {
 209         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 210         struct ata_device *peer = ata_dev_pair(adev);
 211         struct ata_timing t, p;
 212         static int via_clock = 33333;   /* Bus clock in kHZ - ought to be tunable one day */
 213         unsigned long T =  1000000000 / via_clock;
 214         unsigned long UT = T/tdiv;
 215         int ut;
 216         int offset = 3 - (2*ap->port_no) - adev->devno;
 217
 218
 219         /* Calculate the timing values we require */
 220         ata_timing_compute(adev, mode, &t, T, UT);
 221
 222         /* We share 8bit timing so we must merge the constraints */
 223         if (peer) {
 224                 if (peer->pio_mode) {
 225                         ata_timing_compute(peer, peer->pio_mode, &p, T, UT);
 226                         ata_timing_merge(&p, &t, &t, ATA_TIMING_8BIT);
 227                 }
 228         }
 229
 230         /* Address setup is programmable but breaks on UDMA133 setups */
 231         if (set_ast) {
 232                 u8 setup;       /* 2 bits per drive */
 233                 int shift = 2 * offset;
 234
 235                 pci_read_config_byte(pdev, 0x4C, &setup);
 236                 setup &= ~(3 << shift);
 237                 setup |= FIT(t.setup, 1, 4) << shift;   /* 1,4 or 1,4 - 1  FIXME */
 238                 pci_write_config_byte(pdev, 0x4C, setup);
 239         }
 240
 241         /* Load the PIO mode bits */
 242         pci_write_config_byte(pdev, 0x4F - ap->port_no,
 243                 ((FIT(t.act8b, 1, 16) - 1) << 4) | (FIT(t.rec8b, 1, 16) - 1));
 244         pci_write_config_byte(pdev, 0x48 + offset,
 245                 ((FIT(t.active, 1, 16) - 1) << 4) | (FIT(t.recover, 1, 16) - 1));
 246
 247         /* Load the UDMA bits according to type */
 248         switch(udma_type) {
 249                 default:
 250                         /* BUG() ? */
 251                         /* fall through */
 252                 case 33:
 253                         ut = t.udma ? (0xe0 | (FIT(t.udma, 2, 5) - 2)) : 0x03;
 254                         break;
 255                 case 66:
 256                         ut = t.udma ? (0xe8 | (FIT(t.udma, 2, 9) - 2)) : 0x0f;
 257                         break;
 258                 case 100:
 259                         ut = t.udma ? (0xe0 | (FIT(t.udma, 2, 9) - 2)) : 0x07;
 260                         break;
 261                 case 133:
 262                         ut = t.udma ? (0xe0 | (FIT(t.udma, 2, 9) - 2)) : 0x07;
 263                         break;
 264         }
 265         /* Set UDMA unless device is not UDMA capable */
 266         if (udma_type)
 267                 pci_write_config_byte(pdev, 0x50 + offset, ut);
 268 }
 269
 270 static void via_set_piomode(struct ata_port *ap, struct ata_device *adev)
 271 {
 272         const struct via_isa_bridge *config = ap->host->private_data;
 273         int set_ast = (config->flags & VIA_BAD_AST) ? 0 : 1;
 274         int mode = config->flags & VIA_UDMA;
 275         static u8 tclock[5] = { 1, 1, 2, 3, 4 };
 276         static u8 udma[5] = { 0, 33, 66, 100, 133 };
 277
 278         via_do_set_mode(ap, adev, adev->pio_mode, tclock[mode], set_ast, udma[mode]);
 279 }
 280
 281 static void via_set_dmamode(struct ata_port *ap, struct ata_device *adev)
 282 {
 283         const struct via_isa_bridge *config = ap->host->private_data;
 284         int set_ast = (config->flags & VIA_BAD_AST) ? 0 : 1;
 285         int mode = config->flags & VIA_UDMA;
 286         static u8 tclock[5] = { 1, 1, 2, 3, 4 };
 287         static u8 udma[5] = { 0, 33, 66, 100, 133 };
 288
 289         via_do_set_mode(ap, adev, adev->dma_mode, tclock[mode], set_ast, udma[mode]);
 290 }
 291
 292 static struct scsi_host_template via_sht = {
 293         .module                 = THIS_MODULE,
 294         .name                   = DRV_NAME,
 295         .ioctl                  = ata_scsi_ioctl,
 296         .queuecommand           = ata_scsi_queuecmd,
 297         .can_queue              = ATA_DEF_QUEUE,
 298         .this_id                = ATA_SHT_THIS_ID,
 299         .sg_tablesize           = LIBATA_MAX_PRD,
 300         .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,
 301         .emulated               = ATA_SHT_EMULATED,
 302         .use_clustering         = ATA_SHT_USE_CLUSTERING,
 303         .proc_name              = DRV_NAME,
 304         .dma_boundary           = ATA_DMA_BOUNDARY,
 305         .slave_configure        = ata_scsi_slave_config,
 306         .slave_destroy          = ata_scsi_slave_destroy,
 307         .bios_param             = ata_std_bios_param,
 308 #ifdef CONFIG_PM
 309         .resume                 = ata_scsi_device_resume,
 310         .suspend                = ata_scsi_device_suspend,
 311 #endif
 312 };
 313
 314 static struct ata_port_operations via_port_ops = {
 315         .port_disable   = ata_port_disable,
 316         .set_piomode    = via_set_piomode,
 317         .set_dmamode    = via_set_dmamode,
 318         .mode_filter    = ata_pci_default_filter,
 319
 320         .tf_load        = ata_tf_load,
 321         .tf_read        = ata_tf_read,
 322         .check_status   = ata_check_status,
 323         .exec_command   = ata_exec_command,
 324         .dev_select     = ata_std_dev_select,
 325
 326         .freeze         = ata_bmdma_freeze,
 327         .thaw           = ata_bmdma_thaw,
 328         .error_handler  = via_error_handler,
 329         .post_internal_cmd = ata_bmdma_post_internal_cmd,
 330
 331         .bmdma_setup    = ata_bmdma_setup,
 332         .bmdma_start    = ata_bmdma_start,
 333         .bmdma_stop     = ata_bmdma_stop,
 334         .bmdma_status   = ata_bmdma_status,
 335
 336         .qc_prep        = ata_qc_prep,
 337         .qc_issue       = ata_qc_issue_prot,
 338
 339         .data_xfer      = ata_data_xfer,
 340
 341         .irq_handler    = ata_interrupt,
 342         .irq_clear      = ata_bmdma_irq_clear,
 343         .irq_on         = ata_irq_on,
 344         .irq_ack        = ata_irq_ack,
 345
 346         .port_start     = ata_port_start,
 347 };
 348
 349 static struct ata_port_operations via_port_ops_noirq = {
 350         .port_disable   = ata_port_disable,
 351         .set_piomode    = via_set_piomode,
 352         .set_dmamode    = via_set_dmamode,
 353         .mode_filter    = ata_pci_default_filter,
 354
 355         .tf_load        = ata_tf_load,
 356         .tf_read        = ata_tf_read,
 357         .check_status   = ata_check_status,
 358         .exec_command   = ata_exec_command,
 359         .dev_select     = ata_std_dev_select,
 360
 361         .freeze         = ata_bmdma_freeze,
 362         .thaw           = ata_bmdma_thaw,
 363         .error_handler  = via_error_handler,
 364         .post_internal_cmd = ata_bmdma_post_internal_cmd,
 365
 366         .bmdma_setup    = ata_bmdma_setup,
 367         .bmdma_start    = ata_bmdma_start,
 368         .bmdma_stop     = ata_bmdma_stop,
 369         .bmdma_status   = ata_bmdma_status,
 370
 371         .qc_prep        = ata_qc_prep,
 372         .qc_issue       = ata_qc_issue_prot,
 373
 374         .data_xfer      = ata_data_xfer_noirq,
 375
 376         .irq_handler    = ata_interrupt,
 377         .irq_clear      = ata_bmdma_irq_clear,
 378         .irq_on         = ata_irq_on,
 379         .irq_ack        = ata_irq_ack,
 380
 381         .port_start     = ata_port_start,
 382 };
 383
 384 /**
 385  *      via_config_fifo         -       set up the FIFO
 386  *      @pdev: PCI device
 387  *      @flags: configuration flags
 388  *
 389  *      Set the FIFO properties for this device if neccessary. Used both on
 390  *      set up and on and the resume path
 391  */
 392
 393 static void via_config_fifo(struct pci_dev *pdev, unsigned int flags)
 394 {
 395         u8 enable;
 396
 397         /* 0x40 low bits indicate enabled channels */
 398         pci_read_config_byte(pdev, 0x40 , &enable);
 399         enable &= 3;
 400
 401         if (flags & VIA_SET_FIFO) {
 402                 static const u8 fifo_setting[4] = {0x00, 0x60, 0x00, 0x20};
 403                 u8 fifo;
 404
 405                 pci_read_config_byte(pdev, 0x43, &fifo);
 406
 407                 /* Clear PREQ# until DDACK# for errata */
 408                 if (flags & VIA_BAD_PREQ)
 409                         fifo &= 0x7F;
 410                 else
 411                         fifo &= 0x9f;
 412                 /* Turn on FIFO for enabled channels */
 413                 fifo |= fifo_setting[enable];
 414                 pci_write_config_byte(pdev, 0x43, fifo);
 415         }
 416 }
 417
 418 /**
 419  *      via_init_one            -       discovery callback
 420  *      @pdev: PCI device
 421  *      @id: PCI table info
 422  *
 423  *      A VIA IDE interface has been discovered. Figure out what revision
 424  *      and perform configuration work before handing it to the ATA layer
 425  */
 426
 427 static int via_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
 428 {
 429         /* Early VIA without UDMA support */
 430         static struct ata_port_info via_mwdma_info = {
 431                 .sht = &via_sht,
 432                 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SETXFER_POLLING,
 433                 .pio_mask = 0x1f,
 434                 .mwdma_mask = 0x07,
 435                 .port_ops = &via_port_ops
 436         };
 437         /* Ditto with IRQ masking required */
 438         static struct ata_port_info via_mwdma_info_borked = {
 439                 .sht = &via_sht,
 440                 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SETXFER_POLLING,
 441                 .pio_mask = 0x1f,
 442                 .mwdma_mask = 0x07,
 443                 .port_ops = &via_port_ops_noirq,
 444         };
 445         /* VIA UDMA 33 devices (and borked 66) */
 446         static struct ata_port_info via_udma33_info = {
 447                 .sht = &via_sht,
 448                 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SETXFER_POLLING,
 449                 .pio_mask = 0x1f,
 450                 .mwdma_mask = 0x07,
 451                 .udma_mask = 0x7,
 452                 .port_ops = &via_port_ops
 453         };
 454         /* VIA UDMA 66 devices */
 455         static struct ata_port_info via_udma66_info = {
 456                 .sht = &via_sht,
 457                 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SETXFER_POLLING,
 458                 .pio_mask = 0x1f,
 459                 .mwdma_mask = 0x07,
 460                 .udma_mask = 0x1f,
 461                 .port_ops = &via_port_ops
 462         };
 463         /* VIA UDMA 100 devices */
 464         static struct ata_port_info via_udma100_info = {
 465                 .sht = &via_sht,
 466                 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SETXFER_POLLING,
 467                 .pio_mask = 0x1f,
 468                 .mwdma_mask = 0x07,
 469                 .udma_mask = 0x3f,
 470                 .port_ops = &via_port_ops
 471         };
 472         /* UDMA133 with bad AST (All current 133) */
 473         static struct ata_port_info via_udma133_info = {
 474                 .sht = &via_sht,
 475                 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SETXFER_POLLING,
 476                 .pio_mask = 0x1f,
 477                 .mwdma_mask = 0x07,
 478                 .udma_mask = 0x7f,      /* FIXME: should check north bridge */
 479                 .port_ops = &via_port_ops
 480         };
 481         struct ata_port_info *port_info[2], *type;
 482         struct pci_dev *isa = NULL;
 483         const struct via_isa_bridge *config;
 484         static int printed_version;
 485         u8 t;
 486         u8 enable;
 487         u32 timing;
 488
 489         if (!printed_version++)
 490                 dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
 491
 492         /* To find out how the IDE will behave and what features we
 493            actually have to look at the bridge not the IDE controller */
 494         for (config = via_isa_bridges; config->id; config++)
 495                 if ((isa = pci_get_device(PCI_VENDOR_ID_VIA +
 496                         !!(config->flags & VIA_BAD_ID),
 497                         config->id, NULL))) {
 498
 499                         pci_read_config_byte(isa, PCI_REVISION_ID, &t);
 500                         if (t >= config->rev_min &&
 501                             t <= config->rev_max)
 502                                 break;
 503                         pci_dev_put(isa);
 504                 }
 505
 506         if (!config->id) {
 507                 printk(KERN_WARNING "via: Unknown VIA SouthBridge, disabling.\n");
 508                 return -ENODEV;
 509         }
 510         pci_dev_put(isa);
 511
 512         /* 0x40 low bits indicate enabled channels */
 513         pci_read_config_byte(pdev, 0x40 , &enable);
 514         enable &= 3;
 515         if (enable == 0) {
 516                 return -ENODEV;
 517         }
 518
 519         /* Initialise the FIFO for the enabled channels. */
 520         via_config_fifo(pdev, config->flags);
 521
 522         /* Clock set up */
 523         switch(config->flags & VIA_UDMA) {
 524                 case VIA_UDMA_NONE:
 525                         if (config->flags & VIA_NO_UNMASK)
 526                                 type = &via_mwdma_info_borked;
 527                         else
 528                                 type = &via_mwdma_info;
 529                         break;
 530                 case VIA_UDMA_33:
 531                         type = &via_udma33_info;
 532                         break;
 533                 case VIA_UDMA_66:
 534                         type = &via_udma66_info;
 535                         /* The 66 MHz devices require we enable the clock */
 536                         pci_read_config_dword(pdev, 0x50, &timing);
 537                         timing |= 0x80008;
 538                         pci_write_config_dword(pdev, 0x50, timing);
 539                         break;
 540                 case VIA_UDMA_100:
 541                         type = &via_udma100_info;
 542                         break;
 543                 case VIA_UDMA_133:
 544                         type = &via_udma133_info;
 545                         break;
 546                 default:
 547                         WARN_ON(1);
 548                         return -ENODEV;
 549         }
 550
 551         if (config->flags & VIA_BAD_CLK66) {
 552                 /* Disable the 66MHz clock on problem devices */
 553                 pci_read_config_dword(pdev, 0x50, &timing);
 554                 timing &= ~0x80008;
 555                 pci_write_config_dword(pdev, 0x50, timing);
 556         }
 557
 558         /* We have established the device type, now fire it up */
 559         type->private_data = (void *)config;
 560
 561         port_info[0] = port_info[1] = type;
 562         return ata_pci_init_one(pdev, port_info, 2);
 563 }
 564
 565 #ifdef CONFIG_PM
 566 /**
 567  *      via_reinit_one          -       reinit after resume
 568  *      @pdev; PCI device
 569  *
 570  *      Called when the VIA PATA device is resumed. We must then
 571  *      reconfigure the fifo and other setup we may have altered. In
 572  *      addition the kernel needs to have the resume methods on PCI
 573  *      quirk supported.
 574  */
 575
 576 static int via_reinit_one(struct pci_dev *pdev)
 577 {
 578         u32 timing;
 579         struct ata_host *host = dev_get_drvdata(&pdev->dev);
 580         const struct via_isa_bridge *config = host->private_data;
 581
 582         via_config_fifo(pdev, config->flags);
 583
 584         if ((config->flags & VIA_UDMA) == VIA_UDMA_66) {
 585                 /* The 66 MHz devices require we enable the clock */
 586                 pci_read_config_dword(pdev, 0x50, &timing);
 587                 timing |= 0x80008;
 588                 pci_write_config_dword(pdev, 0x50, timing);
 589         }
 590         if (config->flags & VIA_BAD_CLK66) {
 591                 /* Disable the 66MHz clock on problem devices */
 592                 pci_read_config_dword(pdev, 0x50, &timing);
 593                 timing &= ~0x80008;
 594                 pci_write_config_dword(pdev, 0x50, timing);
 595         }
 596         return ata_pci_device_resume(pdev);
 597 }
 598 #endif
 599
 600 static const struct pci_device_id via[] = {
 601         { PCI_VDEVICE(VIA, PCI_DEVICE_ID_VIA_82C576_1), },
 602         { PCI_VDEVICE(VIA, PCI_DEVICE_ID_VIA_82C586_1), },
 603         { PCI_VDEVICE(VIA, PCI_DEVICE_ID_VIA_6410), },
 604         { PCI_VDEVICE(VIA, PCI_DEVICE_ID_VIA_SATA_EIDE), },
 605
 606         { },
 607 };
 608
 609 static struct pci_driver via_pci_driver = {
 610         .name           = DRV_NAME,
 611         .id_table       = via,
 612         .probe          = via_init_one,
 613         .remove         = ata_pci_remove_one,
 614 #ifdef CONFIG_PM
 615         .suspend        = ata_pci_device_suspend,
 616         .resume         = via_reinit_one,
 617 #endif
 618 };
 619
 620 static int __init via_init(void)
 621 {
 622         return pci_register_driver(&via_pci_driver);
 623 }
 624
 625 static void __exit via_exit(void)
 626 {
 627         pci_unregister_driver(&via_pci_driver);
 628 }
 629
 630 MODULE_AUTHOR("Alan Cox");
 631 MODULE_DESCRIPTION("low-level driver for VIA PATA");
 632 MODULE_LICENSE("GPL");
 633 MODULE_DEVICE_TABLE(pci, via);
 634 MODULE_VERSION(DRV_VERSION);
 635
 636 module_init(via_init);
 637 module_exit(via_exit);