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pata_via.c

/*
 * pata_via.c     - VIA PATA for new ATA layer
 *                  (C) 2005-2006 Red Hat Inc
 *                  Alan Cox <alan@redhat.com>
 *
 *  Documentation
 *    Most chipset documentation available under NDA only
 *
 *  VIA version guide
 *    VIA VT82C561      -     early design, uses ata_generic currently
 *    VIA VT82C576      -     MWDMA, 33Mhz
 *    VIA VT82C586      -     MWDMA, 33Mhz
 *    VIA VT82C586a     -     Added UDMA to 33Mhz
 *    VIA VT82C586b     -     UDMA33
 *    VIA VT82C596a     -     Nonfunctional UDMA66
 *    VIA VT82C596b     -     Working UDMA66
 *    VIA VT82C686      -     Nonfunctional UDMA66
 *    VIA VT82C686a     -     Working UDMA66
 *    VIA VT82C686b     -     Updated to UDMA100
 *    VIA VT8231  -     UDMA100
 *    VIA VT8233  -     UDMA100
 *    VIA VT8233a -     UDMA133
 *    VIA VT8233c -     UDMA100
 *    VIA VT8235  -     UDMA133
 *    VIA VT8237  -     UDMA133
 *    VIA VT8237S -     UDMA133
 *    VIA VT8251  -     UDMA133
 *
 *    Most registers remain compatible across chips. Others start reserved
 *    and acquire sensible semantics if set to 1 (eg cable detect). A few
 *    exceptions exist, notably around the FIFO settings.
 *
 *    One additional quirk of the VIA design is that like ALi they use few
 *    PCI IDs for a lot of chips.
 *
 *    Based heavily on:
 *
 * Version 3.38
 *
 * VIA IDE driver for Linux. Supported southbridges:
 *
 *   vt82c576, vt82c586, vt82c586a, vt82c586b, vt82c596a, vt82c596b,
 *   vt82c686, vt82c686a, vt82c686b, vt8231, vt8233, vt8233c, vt8233a,
 *   vt8235, vt8237
 *
 * Copyright (c) 2000-2002 Vojtech Pavlik
 *
 * Based on the work of:
 *    Michel Aubry
 *    Jeff Garzik
 *    Andre Hedrick

 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <scsi/scsi_host.h>
#include <linux/libata.h>
#include <linux/dmi.h>

#define DRV_NAME "pata_via"
#define DRV_VERSION "0.3.3"

/*
 *    The following comes directly from Vojtech Pavlik's ide/pci/via82cxxx
 *    driver.
 */

enum {
      VIA_UDMA    = 0x007,
      VIA_UDMA_NONE     = 0x000,
      VIA_UDMA_33 = 0x001,
      VIA_UDMA_66 = 0x002,
      VIA_UDMA_100      = 0x003,
      VIA_UDMA_133      = 0x004,
      VIA_BAD_PREQ      = 0x010, /* Crashes if PREQ# till DDACK# set */
      VIA_BAD_CLK66     = 0x020, /* 66 MHz clock doesn't work correctly */
      VIA_SET_FIFO      = 0x040, /* Needs to have FIFO split set */
      VIA_NO_UNMASK     = 0x080, /* Doesn't work with IRQ unmasking on */
      VIA_BAD_ID  = 0x100, /* Has wrong vendor ID (0x1107) */
      VIA_BAD_AST = 0x200, /* Don't touch Address Setup Timing */
      VIA_NO_ENABLES    = 0x400, /* Has no enablebits */
};

/*
 * VIA SouthBridge chips.
 */

static const struct via_isa_bridge {
      const char *name;
      u16 id;
      u8 rev_min;
      u8 rev_max;
      u16 flags;
} via_isa_bridges[] = {
      { "vx800",  PCI_DEVICE_ID_VIA_VX800,    0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
      { "vt8237s",      PCI_DEVICE_ID_VIA_8237S,    0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
      { "vt8251", PCI_DEVICE_ID_VIA_8251,     0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
      { "cx700",  PCI_DEVICE_ID_VIA_CX700,    0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
      { "vt6410", PCI_DEVICE_ID_VIA_6410,     0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST | VIA_NO_ENABLES},
      { "vt8237a",      PCI_DEVICE_ID_VIA_8237A,    0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
      { "vt8237", PCI_DEVICE_ID_VIA_8237,     0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
      { "vt8235", PCI_DEVICE_ID_VIA_8235,     0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
      { "vt8233a",      PCI_DEVICE_ID_VIA_8233A,    0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
      { "vt8233c",      PCI_DEVICE_ID_VIA_8233C_0,  0x00, 0x2f, VIA_UDMA_100 },
      { "vt8233", PCI_DEVICE_ID_VIA_8233_0,   0x00, 0x2f, VIA_UDMA_100 },
      { "vt8231", PCI_DEVICE_ID_VIA_8231,     0x00, 0x2f, VIA_UDMA_100 },
      { "vt82c686b",    PCI_DEVICE_ID_VIA_82C686,   0x40, 0x4f, VIA_UDMA_100 },
      { "vt82c686a",    PCI_DEVICE_ID_VIA_82C686,   0x10, 0x2f, VIA_UDMA_66 },
      { "vt82c686",     PCI_DEVICE_ID_VIA_82C686,   0x00, 0x0f, VIA_UDMA_33 | VIA_BAD_CLK66 },
      { "vt82c596b",    PCI_DEVICE_ID_VIA_82C596,   0x10, 0x2f, VIA_UDMA_66 },
      { "vt82c596a",    PCI_DEVICE_ID_VIA_82C596,   0x00, 0x0f, VIA_UDMA_33 | VIA_BAD_CLK66 },
      { "vt82c586b",    PCI_DEVICE_ID_VIA_82C586_0, 0x47, 0x4f, VIA_UDMA_33 | VIA_SET_FIFO },
      { "vt82c586b",    PCI_DEVICE_ID_VIA_82C586_0, 0x40, 0x46, VIA_UDMA_33 | VIA_SET_FIFO | VIA_BAD_PREQ },
      { "vt82c586b",    PCI_DEVICE_ID_VIA_82C586_0, 0x30, 0x3f, VIA_UDMA_33 | VIA_SET_FIFO },
      { "vt82c586a",    PCI_DEVICE_ID_VIA_82C586_0, 0x20, 0x2f, VIA_UDMA_33 | VIA_SET_FIFO },
      { "vt82c586",     PCI_DEVICE_ID_VIA_82C586_0, 0x00, 0x0f, VIA_UDMA_NONE | VIA_SET_FIFO },
      { "vt82c576",     PCI_DEVICE_ID_VIA_82C576,   0x00, 0x2f, VIA_UDMA_NONE | VIA_SET_FIFO | VIA_NO_UNMASK },
      { "vt82c576",     PCI_DEVICE_ID_VIA_82C576,   0x00, 0x2f, VIA_UDMA_NONE | VIA_SET_FIFO | VIA_NO_UNMASK | VIA_BAD_ID },
      { NULL }
};


/*
 *    Cable special cases
 */

static const struct dmi_system_id cable_dmi_table[] = {
      {
            .ident = "Acer Ferrari 3400",
            .matches = {
                  DMI_MATCH(DMI_BOARD_VENDOR, "Acer,Inc."),
                  DMI_MATCH(DMI_BOARD_NAME, "Ferrari 3400"),
            },
      },
      { }
};

static int via_cable_override(struct pci_dev *pdev)
{
      /* Systems by DMI */
      if (dmi_check_system(cable_dmi_table))
            return 1;
      /* Arima W730-K8/Targa Visionary 811/... */
      if (pdev->subsystem_vendor == 0x161F && pdev->subsystem_device == 0x2032)
            return 1;
      return 0;
}


/**
 *    via_cable_detect  -     cable detection
 *    @ap: ATA port
 *
 *    Perform cable detection. Actually for the VIA case the BIOS
 *    already did this for us. We read the values provided by the
 *    BIOS. If you are using an 8235 in a non-PC configuration you
 *    may need to update this code.
 *
 *    Hotplug also impacts on this.
 */

static int via_cable_detect(struct ata_port *ap) {
      const struct via_isa_bridge *config = ap->host->private_data;
      struct pci_dev *pdev = to_pci_dev(ap->host->dev);
      u32 ata66;

      if (via_cable_override(pdev))
            return ATA_CBL_PATA40_SHORT;

      /* Early chips are 40 wire */
      if ((config->flags & VIA_UDMA) < VIA_UDMA_66)
            return ATA_CBL_PATA40;
      /* UDMA 66 chips have only drive side logic */
      else if ((config->flags & VIA_UDMA) < VIA_UDMA_100)
            return ATA_CBL_PATA_UNK;
      /* UDMA 100 or later */
      pci_read_config_dword(pdev, 0x50, &ata66);
      /* Check both the drive cable reporting bits, we might not have
         two drives */
      if (ata66 & (0x10100000 >> (16 * ap->port_no)))
            return ATA_CBL_PATA80;
      /* Check with ACPI so we can spot BIOS reported SATA bridges */
      if (ata_acpi_cbl_80wire(ap))
            return ATA_CBL_PATA80;
      return ATA_CBL_PATA40;
}

static int via_pre_reset(struct ata_link *link, unsigned long deadline)
{
      struct ata_port *ap = link->ap;
      const struct via_isa_bridge *config = ap->host->private_data;

      if (!(config->flags & VIA_NO_ENABLES)) {
            static const struct pci_bits via_enable_bits[] = {
                  { 0x40, 1, 0x02, 0x02 },
                  { 0x40, 1, 0x01, 0x01 }
            };
            struct pci_dev *pdev = to_pci_dev(ap->host->dev);
            if (!pci_test_config_bits(pdev, &via_enable_bits[ap->port_no]))
                  return -ENOENT;
      }

      return ata_std_prereset(link, deadline);
}


/**
 *    via_error_handler       -     reset for VIA chips
 *    @ap: ATA port
 *
 *    Handle the reset callback for the later chips with cable detect
 */

static void via_error_handler(struct ata_port *ap)
{
      ata_bmdma_drive_eh(ap, via_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
}

/**
 *    via_do_set_mode   -     set initial PIO mode data
 *    @ap: ATA interface
 *    @adev: ATA device
 *    @mode: ATA mode being programmed
 *    @tdiv: Clocks per PCI clock
 *    @set_ast: Set to program address setup
 *    @udma_type: UDMA mode/format of registers
 *
 *    Program the VIA registers for DMA and PIO modes. Uses the ata timing
 *    support in order to compute modes.
 *
 *    FIXME: Hotplug will require we serialize multiple mode changes
 *    on the two channels.
 */

static void via_do_set_mode(struct ata_port *ap, struct ata_device *adev, int mode, int tdiv, int set_ast, int udma_type)
{
      struct pci_dev *pdev = to_pci_dev(ap->host->dev);
      struct ata_device *peer = ata_dev_pair(adev);
      struct ata_timing t, p;
      static int via_clock = 33333; /* Bus clock in kHZ - ought to be tunable one day */
      unsigned long T =  1000000000 / via_clock;
      unsigned long UT = T/tdiv;
      int ut;
      int offset = 3 - (2*ap->port_no) - adev->devno;

      /* Calculate the timing values we require */
      ata_timing_compute(adev, mode, &t, T, UT);

      /* We share 8bit timing so we must merge the constraints */
      if (peer) {
            if (peer->pio_mode) {
                  ata_timing_compute(peer, peer->pio_mode, &p, T, UT);
                  ata_timing_merge(&p, &t, &t, ATA_TIMING_8BIT);
            }
      }

      /* Address setup is programmable but breaks on UDMA133 setups */
      if (set_ast) {
            u8 setup;   /* 2 bits per drive */
            int shift = 2 * offset;

            pci_read_config_byte(pdev, 0x4C, &setup);
            setup &= ~(3 << shift);
            setup |= FIT(t.setup, 1, 4) << shift;     /* 1,4 or 1,4 - 1  FIXME */
            pci_write_config_byte(pdev, 0x4C, setup);
      }

      /* Load the PIO mode bits */
      pci_write_config_byte(pdev, 0x4F - ap->port_no,
            ((FIT(t.act8b, 1, 16) - 1) << 4) | (FIT(t.rec8b, 1, 16) - 1));
      pci_write_config_byte(pdev, 0x48 + offset,
            ((FIT(t.active, 1, 16) - 1) << 4) | (FIT(t.recover, 1, 16) - 1));

      /* Load the UDMA bits according to type */
      switch(udma_type) {
            default:
                  /* BUG() ? */
                  /* fall through */
            case 33:
                  ut = t.udma ? (0xe0 | (FIT(t.udma, 2, 5) - 2)) : 0x03;
                  break;
            case 66:
                  ut = t.udma ? (0xe8 | (FIT(t.udma, 2, 9) - 2)) : 0x0f;
                  break;
            case 100:
                  ut = t.udma ? (0xe0 | (FIT(t.udma, 2, 9) - 2)) : 0x07;
                  break;
            case 133:
                  ut = t.udma ? (0xe0 | (FIT(t.udma, 2, 9) - 2)) : 0x07;
                  break;
      }

      /* Set UDMA unless device is not UDMA capable */
      if (udma_type && t.udma) {
            u8 cable80_status;

            /* Get 80-wire cable detection bit */
            pci_read_config_byte(pdev, 0x50 + offset, &cable80_status);
            cable80_status &= 0x10;

            pci_write_config_byte(pdev, 0x50 + offset, ut | cable80_status);
      }
}

static void via_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
      const struct via_isa_bridge *config = ap->host->private_data;
      int set_ast = (config->flags & VIA_BAD_AST) ? 0 : 1;
      int mode = config->flags & VIA_UDMA;
      static u8 tclock[5] = { 1, 1, 2, 3, 4 };
      static u8 udma[5] = { 0, 33, 66, 100, 133 };

      via_do_set_mode(ap, adev, adev->pio_mode, tclock[mode], set_ast, udma[mode]);
}

static void via_set_dmamode(struct ata_port *ap, struct ata_device *adev)
{
      const struct via_isa_bridge *config = ap->host->private_data;
      int set_ast = (config->flags & VIA_BAD_AST) ? 0 : 1;
      int mode = config->flags & VIA_UDMA;
      static u8 tclock[5] = { 1, 1, 2, 3, 4 };
      static u8 udma[5] = { 0, 33, 66, 100, 133 };

      via_do_set_mode(ap, adev, adev->dma_mode, tclock[mode], set_ast, udma[mode]);
}

static struct scsi_host_template via_sht = {
      .module                 = THIS_MODULE,
      .name             = DRV_NAME,
      .ioctl                  = ata_scsi_ioctl,
      .queuecommand           = ata_scsi_queuecmd,
      .can_queue        = ATA_DEF_QUEUE,
      .this_id          = ATA_SHT_THIS_ID,
      .sg_tablesize           = LIBATA_MAX_PRD,
      .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,
      .emulated         = ATA_SHT_EMULATED,
      .use_clustering         = ATA_SHT_USE_CLUSTERING,
      .proc_name        = DRV_NAME,
      .dma_boundary           = ATA_DMA_BOUNDARY,
      .slave_configure  = ata_scsi_slave_config,
      .slave_destroy          = ata_scsi_slave_destroy,
      .bios_param       = ata_std_bios_param,
};

static struct ata_port_operations via_port_ops = {
      .set_piomode      = via_set_piomode,
      .set_dmamode      = via_set_dmamode,
      .mode_filter      = ata_pci_default_filter,

      .tf_load    = ata_tf_load,
      .tf_read    = ata_tf_read,
      .check_status     = ata_check_status,
      .exec_command     = ata_exec_command,
      .dev_select       = ata_std_dev_select,

      .freeze           = ata_bmdma_freeze,
      .thaw       = ata_bmdma_thaw,
      .error_handler    = via_error_handler,
      .post_internal_cmd = ata_bmdma_post_internal_cmd,
      .cable_detect     = via_cable_detect,

      .bmdma_setup      = ata_bmdma_setup,
      .bmdma_start      = ata_bmdma_start,
      .bmdma_stop = ata_bmdma_stop,
      .bmdma_status     = ata_bmdma_status,

      .qc_prep    = ata_qc_prep,
      .qc_issue   = ata_qc_issue_prot,

      .data_xfer  = ata_data_xfer,

      .irq_handler      = ata_interrupt,
      .irq_clear  = ata_bmdma_irq_clear,
      .irq_on           = ata_irq_on,

      .port_start = ata_sff_port_start,
};

static struct ata_port_operations via_port_ops_noirq = {
      .set_piomode      = via_set_piomode,
      .set_dmamode      = via_set_dmamode,
      .mode_filter      = ata_pci_default_filter,

      .tf_load    = ata_tf_load,
      .tf_read    = ata_tf_read,
      .check_status     = ata_check_status,
      .exec_command     = ata_exec_command,
      .dev_select       = ata_std_dev_select,

      .freeze           = ata_bmdma_freeze,
      .thaw       = ata_bmdma_thaw,
      .error_handler    = via_error_handler,
      .post_internal_cmd = ata_bmdma_post_internal_cmd,
      .cable_detect     = via_cable_detect,

      .bmdma_setup      = ata_bmdma_setup,
      .bmdma_start      = ata_bmdma_start,
      .bmdma_stop = ata_bmdma_stop,
      .bmdma_status     = ata_bmdma_status,

      .qc_prep    = ata_qc_prep,
      .qc_issue   = ata_qc_issue_prot,

      .data_xfer  = ata_data_xfer_noirq,

      .irq_handler      = ata_interrupt,
      .irq_clear  = ata_bmdma_irq_clear,
      .irq_on           = ata_irq_on,

      .port_start = ata_sff_port_start,
};

/**
 *    via_config_fifo         -     set up the FIFO
 *    @pdev: PCI device
 *    @flags: configuration flags
 *
 *    Set the FIFO properties for this device if necessary. Used both on
 *    set up and on and the resume path
 */

static void via_config_fifo(struct pci_dev *pdev, unsigned int flags)
{
      u8 enable;

      /* 0x40 low bits indicate enabled channels */
      pci_read_config_byte(pdev, 0x40 , &enable);
      enable &= 3;

      if (flags & VIA_SET_FIFO) {
            static const u8 fifo_setting[4] = {0x00, 0x60, 0x00, 0x20};
            u8 fifo;

            pci_read_config_byte(pdev, 0x43, &fifo);

            /* Clear PREQ# until DDACK# for errata */
            if (flags & VIA_BAD_PREQ)
                  fifo &= 0x7F;
            else
                  fifo &= 0x9f;
            /* Turn on FIFO for enabled channels */
            fifo |= fifo_setting[enable];
            pci_write_config_byte(pdev, 0x43, fifo);
      }
}

/**
 *    via_init_one            -     discovery callback
 *    @pdev: PCI device
 *    @id: PCI table info
 *
 *    A VIA IDE interface has been discovered. Figure out what revision
 *    and perform configuration work before handing it to the ATA layer
 */

static int via_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
{
      /* Early VIA without UDMA support */
      static const struct ata_port_info via_mwdma_info = {
            .sht = &via_sht,
            .flags = ATA_FLAG_SLAVE_POSS,
            .pio_mask = 0x1f,
            .mwdma_mask = 0x07,
            .port_ops = &via_port_ops
      };
      /* Ditto with IRQ masking required */
      static const struct ata_port_info via_mwdma_info_borked = {
            .sht = &via_sht,
            .flags = ATA_FLAG_SLAVE_POSS,
            .pio_mask = 0x1f,
            .mwdma_mask = 0x07,
            .port_ops = &via_port_ops_noirq,
      };
      /* VIA UDMA 33 devices (and borked 66) */
      static const struct ata_port_info via_udma33_info = {
            .sht = &via_sht,
            .flags = ATA_FLAG_SLAVE_POSS,
            .pio_mask = 0x1f,
            .mwdma_mask = 0x07,
            .udma_mask = ATA_UDMA2,
            .port_ops = &via_port_ops
      };
      /* VIA UDMA 66 devices */
      static const struct ata_port_info via_udma66_info = {
            .sht = &via_sht,
            .flags = ATA_FLAG_SLAVE_POSS,
            .pio_mask = 0x1f,
            .mwdma_mask = 0x07,
            .udma_mask = ATA_UDMA4,
            .port_ops = &via_port_ops
      };
      /* VIA UDMA 100 devices */
      static const struct ata_port_info via_udma100_info = {
            .sht = &via_sht,
            .flags = ATA_FLAG_SLAVE_POSS,
            .pio_mask = 0x1f,
            .mwdma_mask = 0x07,
            .udma_mask = ATA_UDMA5,
            .port_ops = &via_port_ops
      };
      /* UDMA133 with bad AST (All current 133) */
      static const struct ata_port_info via_udma133_info = {
            .sht = &via_sht,
            .flags = ATA_FLAG_SLAVE_POSS,
            .pio_mask = 0x1f,
            .mwdma_mask = 0x07,
            .udma_mask = ATA_UDMA6, /* FIXME: should check north bridge */
            .port_ops = &via_port_ops
      };
      struct ata_port_info type;
      const struct ata_port_info *ppi[] = { &type, NULL };
      struct pci_dev *isa = NULL;
      const struct via_isa_bridge *config;
      static int printed_version;
      u8 enable;
      u32 timing;

      if (!printed_version++)
            dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");

      /* To find out how the IDE will behave and what features we
         actually have to look at the bridge not the IDE controller */
      for (config = via_isa_bridges; config->id; config++)
            if ((isa = pci_get_device(PCI_VENDOR_ID_VIA +
                  !!(config->flags & VIA_BAD_ID),
                  config->id, NULL))) {

                  if (isa->revision >= config->rev_min &&
                      isa->revision <= config->rev_max)
                        break;
                  pci_dev_put(isa);
            }

      if (!config->id) {
            printk(KERN_WARNING "via: Unknown VIA SouthBridge, disabling.\n");
            return -ENODEV;
      }
      pci_dev_put(isa);

      /* 0x40 low bits indicate enabled channels */
      pci_read_config_byte(pdev, 0x40 , &enable);
      enable &= 3;
      if (enable == 0) {
            return -ENODEV;
      }

      /* Initialise the FIFO for the enabled channels. */
      via_config_fifo(pdev, config->flags);

      /* Clock set up */
      switch(config->flags & VIA_UDMA) {
            case VIA_UDMA_NONE:
                  if (config->flags & VIA_NO_UNMASK)
                        type = via_mwdma_info_borked;
                  else
                        type = via_mwdma_info;
                  break;
            case VIA_UDMA_33:
                  type = via_udma33_info;
                  break;
            case VIA_UDMA_66:
                  type = via_udma66_info;
                  /* The 66 MHz devices require we enable the clock */
                  pci_read_config_dword(pdev, 0x50, &timing);
                  timing |= 0x80008;
                  pci_write_config_dword(pdev, 0x50, timing);
                  break;
            case VIA_UDMA_100:
                  type = via_udma100_info;
                  break;
            case VIA_UDMA_133:
                  type = via_udma133_info;
                  break;
            default:
                  WARN_ON(1);
                  return -ENODEV;
      }

      if (config->flags & VIA_BAD_CLK66) {
            /* Disable the 66MHz clock on problem devices */
            pci_read_config_dword(pdev, 0x50, &timing);
            timing &= ~0x80008;
            pci_write_config_dword(pdev, 0x50, timing);
      }

      /* We have established the device type, now fire it up */
      type.private_data = (void *)config;

      return ata_pci_init_one(pdev, ppi);
}

#ifdef CONFIG_PM
/**
 *    via_reinit_one          -     reinit after resume
 *    @pdev; PCI device
 *
 *    Called when the VIA PATA device is resumed. We must then
 *    reconfigure the fifo and other setup we may have altered. In
 *    addition the kernel needs to have the resume methods on PCI
 *    quirk supported.
 */

static int via_reinit_one(struct pci_dev *pdev)
{
      u32 timing;
      struct ata_host *host = dev_get_drvdata(&pdev->dev);
      const struct via_isa_bridge *config = host->private_data;

      via_config_fifo(pdev, config->flags);

      if ((config->flags & VIA_UDMA) == VIA_UDMA_66) {
            /* The 66 MHz devices require we enable the clock */
            pci_read_config_dword(pdev, 0x50, &timing);
            timing |= 0x80008;
            pci_write_config_dword(pdev, 0x50, timing);
      }
      if (config->flags & VIA_BAD_CLK66) {
            /* Disable the 66MHz clock on problem devices */
            pci_read_config_dword(pdev, 0x50, &timing);
            timing &= ~0x80008;
            pci_write_config_dword(pdev, 0x50, timing);
      }
      return ata_pci_device_resume(pdev);
}
#endif

static const struct pci_device_id via[] = {
      { PCI_VDEVICE(VIA, 0x0571), },
      { PCI_VDEVICE(VIA, 0x0581), },
      { PCI_VDEVICE(VIA, 0x1571), },
      { PCI_VDEVICE(VIA, 0x3164), },
      { PCI_VDEVICE(VIA, 0x5324), },

      { },
};

static struct pci_driver via_pci_driver = {
      .name             = DRV_NAME,
      .id_table   = via,
      .probe            = via_init_one,
      .remove           = ata_pci_remove_one,
#ifdef CONFIG_PM
      .suspend    = ata_pci_device_suspend,
      .resume           = via_reinit_one,
#endif
};

static int __init via_init(void)
{
      return pci_register_driver(&via_pci_driver);
}

static void __exit via_exit(void)
{
      pci_unregister_driver(&via_pci_driver);
}

MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("low-level driver for VIA PATA");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, via);
MODULE_VERSION(DRV_VERSION);

module_init(via_init);
module_exit(via_exit);

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