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 "0.3.1"
  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         const struct via_isa_bridge *config = ap->host->private_data;
 139         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 140         u32 ata66;
 141
 142         /* Early chips are 40 wire */
 143         if ((config->flags & VIA_UDMA) < VIA_UDMA_66)
 144                 return ATA_CBL_PATA40;
 145         /* UDMA 66 chips have only drive side logic */
 146         else if((config->flags & VIA_UDMA) < VIA_UDMA_100)
 147                 return ATA_CBL_PATA_UNK;
 148         /* UDMA 100 or later */
 149         pci_read_config_dword(pdev, 0x50, &ata66);
 150         /* Check both the drive cable reporting bits, we might not have
 151            two drives */
 152         if (ata66 & (0x10100000 >> (16 * ap->port_no)))
 153                 return ATA_CBL_PATA80;
 154         return ATA_CBL_PATA40;
 155 }
 156
 157 static int via_pre_reset(struct ata_port *ap)
 158 {
 159         const struct via_isa_bridge *config = ap->host->private_data;
 160
 161         if (!(config->flags & VIA_NO_ENABLES)) {
 162                 static const struct pci_bits via_enable_bits[] = {
 163                         { 0x40, 1, 0x02, 0x02 },
 164                         { 0x40, 1, 0x01, 0x01 }
 165                 };
 166                 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 167                 if (!pci_test_config_bits(pdev, &via_enable_bits[ap->port_no]))
 168                         return -ENOENT;
 169         }
 170         return ata_std_prereset(ap);
 171 }
 172
 173
 174 /**
 175  *      via_error_handler               -       reset for VIA chips
 176  *      @ap: ATA port
 177  *
 178  *      Handle the reset callback for the later chips with cable detect
 179  */
 180
 181 static void via_error_handler(struct ata_port *ap)
 182 {
 183         ata_bmdma_drive_eh(ap, via_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
 184 }
 185
 186 /**
 187  *      via_do_set_mode -       set initial PIO mode data
 188  *      @ap: ATA interface
 189  *      @adev: ATA device
 190  *      @mode: ATA mode being programmed
 191  *      @tdiv: Clocks per PCI clock
 192  *      @set_ast: Set to program address setup
 193  *      @udma_type: UDMA mode/format of registers
 194  *
 195  *      Program the VIA registers for DMA and PIO modes. Uses the ata timing
 196  *      support in order to compute modes.
 197  *
 198  *      FIXME: Hotplug will require we serialize multiple mode changes
 199  *      on the two channels.
 200  */
 201
 202 static void via_do_set_mode(struct ata_port *ap, struct ata_device *adev, int mode, int tdiv, int set_ast, int udma_type)
 203 {
 204         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 205         struct ata_device *peer = ata_dev_pair(adev);
 206         struct ata_timing t, p;
 207         static int via_clock = 33333;   /* Bus clock in kHZ - ought to be tunable one day */
 208         unsigned long T =  1000000000 / via_clock;
 209         unsigned long UT = T/tdiv;
 210         int ut;
 211         int offset = 3 - (2*ap->port_no) - adev->devno;
 212
 213
 214         /* Calculate the timing values we require */
 215         ata_timing_compute(adev, mode, &t, T, UT);
 216
 217         /* We share 8bit timing so we must merge the constraints */
 218         if (peer) {
 219                 if (peer->pio_mode) {
 220                         ata_timing_compute(peer, peer->pio_mode, &p, T, UT);
 221                         ata_timing_merge(&p, &t, &t, ATA_TIMING_8BIT);
 222                 }
 223         }
 224
 225         /* Address setup is programmable but breaks on UDMA133 setups */
 226         if (set_ast) {
 227                 u8 setup;       /* 2 bits per drive */
 228                 int shift = 2 * offset;
 229
 230                 pci_read_config_byte(pdev, 0x4C, &setup);
 231                 setup &= ~(3 << shift);
 232                 setup |= FIT(t.setup, 1, 4) << shift;   /* 1,4 or 1,4 - 1  FIXME */
 233                 pci_write_config_byte(pdev, 0x4C, setup);
 234         }
 235
 236         /* Load the PIO mode bits */
 237         pci_write_config_byte(pdev, 0x4F - ap->port_no,
 238                 ((FIT(t.act8b, 1, 16) - 1) << 4) | (FIT(t.rec8b, 1, 16) - 1));
 239         pci_write_config_byte(pdev, 0x48 + offset,
 240                 ((FIT(t.active, 1, 16) - 1) << 4) | (FIT(t.recover, 1, 16) - 1));
 241
 242         /* Load the UDMA bits according to type */
 243         switch(udma_type) {
 244                 default:
 245                         /* BUG() ? */
 246                         /* fall through */
 247                 case 33:
 248                         ut = t.udma ? (0xe0 | (FIT(t.udma, 2, 5) - 2)) : 0x03;
 249                         break;
 250                 case 66:
 251                         ut = t.udma ? (0xe8 | (FIT(t.udma, 2, 9) - 2)) : 0x0f;
 252                         break;
 253                 case 100:
 254                         ut = t.udma ? (0xe0 | (FIT(t.udma, 2, 9) - 2)) : 0x07;
 255                         break;
 256                 case 133:
 257                         ut = t.udma ? (0xe0 | (FIT(t.udma, 2, 9) - 2)) : 0x07;
 258                         break;
 259         }
 260         /* Set UDMA unless device is not UDMA capable */
 261         if (udma_type)
 262                 pci_write_config_byte(pdev, 0x50 + offset, ut);
 263 }
 264
 265 static void via_set_piomode(struct ata_port *ap, struct ata_device *adev)
 266 {
 267         const struct via_isa_bridge *config = ap->host->private_data;
 268         int set_ast = (config->flags & VIA_BAD_AST) ? 0 : 1;
 269         int mode = config->flags & VIA_UDMA;
 270         static u8 tclock[5] = { 1, 1, 2, 3, 4 };
 271         static u8 udma[5] = { 0, 33, 66, 100, 133 };
 272
 273         via_do_set_mode(ap, adev, adev->pio_mode, tclock[mode], set_ast, udma[mode]);
 274 }
 275
 276 static void via_set_dmamode(struct ata_port *ap, struct ata_device *adev)
 277 {
 278         const struct via_isa_bridge *config = ap->host->private_data;
 279         int set_ast = (config->flags & VIA_BAD_AST) ? 0 : 1;
 280         int mode = config->flags & VIA_UDMA;
 281         static u8 tclock[5] = { 1, 1, 2, 3, 4 };
 282         static u8 udma[5] = { 0, 33, 66, 100, 133 };
 283
 284         via_do_set_mode(ap, adev, adev->dma_mode, tclock[mode], set_ast, udma[mode]);
 285 }
 286
 287 static struct scsi_host_template via_sht = {
 288         .module                 = THIS_MODULE,
 289         .name                   = DRV_NAME,
 290         .ioctl                  = ata_scsi_ioctl,
 291         .queuecommand           = ata_scsi_queuecmd,
 292         .can_queue              = ATA_DEF_QUEUE,
 293         .this_id                = ATA_SHT_THIS_ID,
 294         .sg_tablesize           = LIBATA_MAX_PRD,
 295         .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,
 296         .emulated               = ATA_SHT_EMULATED,
 297         .use_clustering         = ATA_SHT_USE_CLUSTERING,
 298         .proc_name              = DRV_NAME,
 299         .dma_boundary           = ATA_DMA_BOUNDARY,
 300         .slave_configure        = ata_scsi_slave_config,
 301         .slave_destroy          = ata_scsi_slave_destroy,
 302         .bios_param             = ata_std_bios_param,
 303 #ifdef CONFIG_PM
 304         .resume                 = ata_scsi_device_resume,
 305         .suspend                = ata_scsi_device_suspend,
 306 #endif
 307 };
 308
 309 static struct ata_port_operations via_port_ops = {
 310         .port_disable   = ata_port_disable,
 311         .set_piomode    = via_set_piomode,
 312         .set_dmamode    = via_set_dmamode,
 313         .mode_filter    = ata_pci_default_filter,
 314
 315         .tf_load        = ata_tf_load,
 316         .tf_read        = ata_tf_read,
 317         .check_status   = ata_check_status,
 318         .exec_command   = ata_exec_command,
 319         .dev_select     = ata_std_dev_select,
 320
 321         .freeze         = ata_bmdma_freeze,
 322         .thaw           = ata_bmdma_thaw,
 323         .error_handler  = via_error_handler,
 324         .post_internal_cmd = ata_bmdma_post_internal_cmd,
 325         .cable_detect   = via_cable_detect,
 326
 327         .bmdma_setup    = ata_bmdma_setup,
 328         .bmdma_start    = ata_bmdma_start,
 329         .bmdma_stop     = ata_bmdma_stop,
 330         .bmdma_status   = ata_bmdma_status,
 331
 332         .qc_prep        = ata_qc_prep,
 333         .qc_issue       = ata_qc_issue_prot,
 334
 335         .data_xfer      = ata_data_xfer,
 336
 337         .irq_handler    = ata_interrupt,
 338         .irq_clear      = ata_bmdma_irq_clear,
 339         .irq_on         = ata_irq_on,
 340         .irq_ack        = ata_irq_ack,
 341
 342         .port_start     = ata_port_start,
 343 };
 344
 345 static struct ata_port_operations via_port_ops_noirq = {
 346         .port_disable   = ata_port_disable,
 347         .set_piomode    = via_set_piomode,
 348         .set_dmamode    = via_set_dmamode,
 349         .mode_filter    = ata_pci_default_filter,
 350
 351         .tf_load        = ata_tf_load,
 352         .tf_read        = ata_tf_read,
 353         .check_status   = ata_check_status,
 354         .exec_command   = ata_exec_command,
 355         .dev_select     = ata_std_dev_select,
 356
 357         .freeze         = ata_bmdma_freeze,
 358         .thaw           = ata_bmdma_thaw,
 359         .error_handler  = via_error_handler,
 360         .post_internal_cmd = ata_bmdma_post_internal_cmd,
 361         .cable_detect   = via_cable_detect,
 362
 363         .bmdma_setup    = ata_bmdma_setup,
 364         .bmdma_start    = ata_bmdma_start,
 365         .bmdma_stop     = ata_bmdma_stop,
 366         .bmdma_status   = ata_bmdma_status,
 367
 368         .qc_prep        = ata_qc_prep,
 369         .qc_issue       = ata_qc_issue_prot,
 370
 371         .data_xfer      = ata_data_xfer_noirq,
 372
 373         .irq_handler    = ata_interrupt,
 374         .irq_clear      = ata_bmdma_irq_clear,
 375         .irq_on         = ata_irq_on,
 376         .irq_ack        = ata_irq_ack,
 377
 378         .port_start     = ata_port_start,
 379 };
 380
 381 /**
 382  *      via_config_fifo         -       set up the FIFO
 383  *      @pdev: PCI device
 384  *      @flags: configuration flags
 385  *
 386  *      Set the FIFO properties for this device if neccessary. Used both on
 387  *      set up and on and the resume path
 388  */
 389
 390 static void via_config_fifo(struct pci_dev *pdev, unsigned int flags)
 391 {
 392         u8 enable;
 393
 394         /* 0x40 low bits indicate enabled channels */
 395         pci_read_config_byte(pdev, 0x40 , &enable);
 396         enable &= 3;
 397
 398         if (flags & VIA_SET_FIFO) {
 399                 static const u8 fifo_setting[4] = {0x00, 0x60, 0x00, 0x20};
 400                 u8 fifo;
 401
 402                 pci_read_config_byte(pdev, 0x43, &fifo);
 403
 404                 /* Clear PREQ# until DDACK# for errata */
 405                 if (flags & VIA_BAD_PREQ)
 406                         fifo &= 0x7F;
 407                 else
 408                         fifo &= 0x9f;
 409                 /* Turn on FIFO for enabled channels */
 410                 fifo |= fifo_setting[enable];
 411                 pci_write_config_byte(pdev, 0x43, fifo);
 412         }
 413 }
 414
 415 /**
 416  *      via_init_one            -       discovery callback
 417  *      @pdev: PCI device
 418  *      @id: PCI table info
 419  *
 420  *      A VIA IDE interface has been discovered. Figure out what revision
 421  *      and perform configuration work before handing it to the ATA layer
 422  */
 423
 424 static int via_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
 425 {
 426         /* Early VIA without UDMA support */
 427         static struct ata_port_info via_mwdma_info = {
 428                 .sht = &via_sht,
 429                 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SETXFER_POLLING,
 430                 .pio_mask = 0x1f,
 431                 .mwdma_mask = 0x07,
 432                 .port_ops = &via_port_ops
 433         };
 434         /* Ditto with IRQ masking required */
 435         static struct ata_port_info via_mwdma_info_borked = {
 436                 .sht = &via_sht,
 437                 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SETXFER_POLLING,
 438                 .pio_mask = 0x1f,
 439                 .mwdma_mask = 0x07,
 440                 .port_ops = &via_port_ops_noirq,
 441         };
 442         /* VIA UDMA 33 devices (and borked 66) */
 443         static struct ata_port_info via_udma33_info = {
 444                 .sht = &via_sht,
 445                 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SETXFER_POLLING,
 446                 .pio_mask = 0x1f,
 447                 .mwdma_mask = 0x07,
 448                 .udma_mask = 0x7,
 449                 .port_ops = &via_port_ops
 450         };
 451         /* VIA UDMA 66 devices */
 452         static struct ata_port_info via_udma66_info = {
 453                 .sht = &via_sht,
 454                 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SETXFER_POLLING,
 455                 .pio_mask = 0x1f,
 456                 .mwdma_mask = 0x07,
 457                 .udma_mask = 0x1f,
 458                 .port_ops = &via_port_ops
 459         };
 460         /* VIA UDMA 100 devices */
 461         static struct ata_port_info via_udma100_info = {
 462                 .sht = &via_sht,
 463                 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SETXFER_POLLING,
 464                 .pio_mask = 0x1f,
 465                 .mwdma_mask = 0x07,
 466                 .udma_mask = 0x3f,
 467                 .port_ops = &via_port_ops
 468         };
 469         /* UDMA133 with bad AST (All current 133) */
 470         static struct ata_port_info via_udma133_info = {
 471                 .sht = &via_sht,
 472                 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SETXFER_POLLING,
 473                 .pio_mask = 0x1f,
 474                 .mwdma_mask = 0x07,
 475                 .udma_mask = 0x7f,      /* FIXME: should check north bridge */
 476                 .port_ops = &via_port_ops
 477         };
 478         struct ata_port_info *port_info[2], *type;
 479         struct pci_dev *isa = NULL;
 480         const struct via_isa_bridge *config;
 481         static int printed_version;
 482         u8 t;
 483         u8 enable;
 484         u32 timing;
 485
 486         if (!printed_version++)
 487                 dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
 488
 489         /* To find out how the IDE will behave and what features we
 490            actually have to look at the bridge not the IDE controller */
 491         for (config = via_isa_bridges; config->id; config++)
 492                 if ((isa = pci_get_device(PCI_VENDOR_ID_VIA +
 493                         !!(config->flags & VIA_BAD_ID),
 494                         config->id, NULL))) {
 495
 496                         pci_read_config_byte(isa, PCI_REVISION_ID, &t);
 497                         if (t >= config->rev_min &&
 498                             t <= config->rev_max)
 499                                 break;
 500                         pci_dev_put(isa);
 501                 }
 502
 503         if (!config->id) {
 504                 printk(KERN_WARNING "via: Unknown VIA SouthBridge, disabling.\n");
 505                 return -ENODEV;
 506         }
 507         pci_dev_put(isa);
 508
 509         /* 0x40 low bits indicate enabled channels */
 510         pci_read_config_byte(pdev, 0x40 , &enable);
 511         enable &= 3;
 512         if (enable == 0) {
 513                 return -ENODEV;
 514         }
 515
 516         /* Initialise the FIFO for the enabled channels. */
 517         via_config_fifo(pdev, config->flags);
 518
 519         /* Clock set up */
 520         switch(config->flags & VIA_UDMA) {
 521                 case VIA_UDMA_NONE:
 522                         if (config->flags & VIA_NO_UNMASK)
 523                                 type = &via_mwdma_info_borked;
 524                         else
 525                                 type = &via_mwdma_info;
 526                         break;
 527                 case VIA_UDMA_33:
 528                         type = &via_udma33_info;
 529                         break;
 530                 case VIA_UDMA_66:
 531                         type = &via_udma66_info;
 532                         /* The 66 MHz devices require we enable the clock */
 533                         pci_read_config_dword(pdev, 0x50, &timing);
 534                         timing |= 0x80008;
 535                         pci_write_config_dword(pdev, 0x50, timing);
 536                         break;
 537                 case VIA_UDMA_100:
 538                         type = &via_udma100_info;
 539                         break;
 540                 case VIA_UDMA_133:
 541                         type = &via_udma133_info;
 542                         break;
 543                 default:
 544                         WARN_ON(1);
 545                         return -ENODEV;
 546         }
 547
 548         if (config->flags & VIA_BAD_CLK66) {
 549                 /* Disable the 66MHz clock on problem devices */
 550                 pci_read_config_dword(pdev, 0x50, &timing);
 551                 timing &= ~0x80008;
 552                 pci_write_config_dword(pdev, 0x50, timing);
 553         }
 554
 555         /* We have established the device type, now fire it up */
 556         type->private_data = (void *)config;
 557
 558         port_info[0] = port_info[1] = type;
 559         return ata_pci_init_one(pdev, port_info, 2);
 560 }
 561
 562 #ifdef CONFIG_PM
 563 /**
 564  *      via_reinit_one          -       reinit after resume
 565  *      @pdev; PCI device
 566  *
 567  *      Called when the VIA PATA device is resumed. We must then
 568  *      reconfigure the fifo and other setup we may have altered. In
 569  *      addition the kernel needs to have the resume methods on PCI
 570  *      quirk supported.
 571  */
 572
 573 static int via_reinit_one(struct pci_dev *pdev)
 574 {
 575         u32 timing;
 576         struct ata_host *host = dev_get_drvdata(&pdev->dev);
 577         const struct via_isa_bridge *config = host->private_data;
 578
 579         via_config_fifo(pdev, config->flags);
 580
 581         if ((config->flags & VIA_UDMA) == VIA_UDMA_66) {
 582                 /* The 66 MHz devices require we enable the clock */
 583                 pci_read_config_dword(pdev, 0x50, &timing);
 584                 timing |= 0x80008;
 585                 pci_write_config_dword(pdev, 0x50, timing);
 586         }
 587         if (config->flags & VIA_BAD_CLK66) {
 588                 /* Disable the 66MHz clock on problem devices */
 589                 pci_read_config_dword(pdev, 0x50, &timing);
 590                 timing &= ~0x80008;
 591                 pci_write_config_dword(pdev, 0x50, timing);
 592         }
 593         return ata_pci_device_resume(pdev);
 594 }
 595 #endif
 596
 597 static const struct pci_device_id via[] = {
 598         { PCI_VDEVICE(VIA, PCI_DEVICE_ID_VIA_82C576_1), },
 599         { PCI_VDEVICE(VIA, PCI_DEVICE_ID_VIA_82C586_1), },
 600         { PCI_VDEVICE(VIA, PCI_DEVICE_ID_VIA_6410), },
 601         { PCI_VDEVICE(VIA, PCI_DEVICE_ID_VIA_SATA_EIDE), },
 602
 603         { },
 604 };
 605
 606 static struct pci_driver via_pci_driver = {
 607         .name           = DRV_NAME,
 608         .id_table       = via,
 609         .probe          = via_init_one,
 610         .remove         = ata_pci_remove_one,
 611 #ifdef CONFIG_PM
 612         .suspend        = ata_pci_device_suspend,
 613         .resume         = via_reinit_one,
 614 #endif
 615 };
 616
 617 static int __init via_init(void)
 618 {
 619         return pci_register_driver(&via_pci_driver);
 620 }
 621
 622 static void __exit via_exit(void)
 623 {
 624         pci_unregister_driver(&via_pci_driver);
 625 }
 626
 627 MODULE_AUTHOR("Alan Cox");
 628 MODULE_DESCRIPTION("low-level driver for VIA PATA");
 629 MODULE_LICENSE("GPL");
 630 MODULE_DEVICE_TABLE(pci, via);
 631 MODULE_VERSION(DRV_VERSION);
 632
 633 module_init(via_init);
 634 module_exit(via_exit);