linux/drivers/ata/pata_via.c
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   1/*
   2 * pata_via.c   - VIA PATA for new ATA layer
   3 *                        (C) 2005-2006 Red Hat Inc
   4 *
   5 *  Documentation
   6 *      Most chipset documentation available under NDA only
   7 *
   8 *  VIA version guide
   9 *      VIA VT82C561    -       early design, uses ata_generic currently
  10 *      VIA VT82C576    -       MWDMA, 33Mhz
  11 *      VIA VT82C586    -       MWDMA, 33Mhz
  12 *      VIA VT82C586a   -       Added UDMA to 33Mhz
  13 *      VIA VT82C586b   -       UDMA33
  14 *      VIA VT82C596a   -       Nonfunctional UDMA66
  15 *      VIA VT82C596b   -       Working UDMA66
  16 *      VIA VT82C686    -       Nonfunctional UDMA66
  17 *      VIA VT82C686a   -       Working UDMA66
  18 *      VIA VT82C686b   -       Updated to UDMA100
  19 *      VIA VT8231      -       UDMA100
  20 *      VIA VT8233      -       UDMA100
  21 *      VIA VT8233a     -       UDMA133
  22 *      VIA VT8233c     -       UDMA100
  23 *      VIA VT8235      -       UDMA133
  24 *      VIA VT8237      -       UDMA133
  25 *      VIA VT8237A     -       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 <linux/gfp.h>
  62#include <scsi/scsi_host.h>
  63#include <linux/libata.h>
  64#include <linux/dmi.h>
  65
  66#define DRV_NAME "pata_via"
  67#define DRV_VERSION "0.3.4"
  68
  69enum {
  70        VIA_BAD_PREQ    = 0x01, /* Crashes if PREQ# till DDACK# set */
  71        VIA_BAD_CLK66   = 0x02, /* 66 MHz clock doesn't work correctly */
  72        VIA_SET_FIFO    = 0x04, /* Needs to have FIFO split set */
  73        VIA_NO_UNMASK   = 0x08, /* Doesn't work with IRQ unmasking on */
  74        VIA_BAD_ID      = 0x10, /* Has wrong vendor ID (0x1107) */
  75        VIA_BAD_AST     = 0x20, /* Don't touch Address Setup Timing */
  76        VIA_NO_ENABLES  = 0x40, /* Has no enablebits */
  77        VIA_SATA_PATA   = 0x80, /* SATA/PATA combined configuration */
  78};
  79
  80enum {
  81        VIA_IDFLAG_SINGLE = (1 << 0), /* single channel controller) */
  82};
  83
  84/*
  85 * VIA SouthBridge chips.
  86 */
  87
  88static const struct via_isa_bridge {
  89        const char *name;
  90        u16 id;
  91        u8 rev_min;
  92        u8 rev_max;
  93        u8 udma_mask;
  94        u8 flags;
  95} via_isa_bridges[] = {
  96        { "vx855",      PCI_DEVICE_ID_VIA_VX855,    0x00, 0x2f, ATA_UDMA6, VIA_BAD_AST | VIA_SATA_PATA },
  97        { "vx800",      PCI_DEVICE_ID_VIA_VX800,    0x00, 0x2f, ATA_UDMA6, VIA_BAD_AST | VIA_SATA_PATA },
  98        { "vt8261",     PCI_DEVICE_ID_VIA_8261,     0x00, 0x2f, ATA_UDMA6, VIA_BAD_AST },
  99        { "vt8237s",    PCI_DEVICE_ID_VIA_8237S,    0x00, 0x2f, ATA_UDMA6, VIA_BAD_AST },
 100        { "vt8251",     PCI_DEVICE_ID_VIA_8251,     0x00, 0x2f, ATA_UDMA6, VIA_BAD_AST },
 101        { "cx700",      PCI_DEVICE_ID_VIA_CX700,    0x00, 0x2f, ATA_UDMA6, VIA_BAD_AST | VIA_SATA_PATA },
 102        { "vt6410",     PCI_DEVICE_ID_VIA_6410,     0x00, 0x2f, ATA_UDMA6, VIA_BAD_AST | VIA_NO_ENABLES },
 103        { "vt6415",     PCI_DEVICE_ID_VIA_6415,     0x00, 0xff, ATA_UDMA6, VIA_BAD_AST | VIA_NO_ENABLES },
 104        { "vt8237a",    PCI_DEVICE_ID_VIA_8237A,    0x00, 0x2f, ATA_UDMA6, VIA_BAD_AST },
 105        { "vt8237",     PCI_DEVICE_ID_VIA_8237,     0x00, 0x2f, ATA_UDMA6, VIA_BAD_AST },
 106        { "vt8235",     PCI_DEVICE_ID_VIA_8235,     0x00, 0x2f, ATA_UDMA6, VIA_BAD_AST },
 107        { "vt8233a",    PCI_DEVICE_ID_VIA_8233A,    0x00, 0x2f, ATA_UDMA6, VIA_BAD_AST },
 108        { "vt8233c",    PCI_DEVICE_ID_VIA_8233C_0,  0x00, 0x2f, ATA_UDMA5, },
 109        { "vt8233",     PCI_DEVICE_ID_VIA_8233_0,   0x00, 0x2f, ATA_UDMA5, },
 110        { "vt8231",     PCI_DEVICE_ID_VIA_8231,     0x00, 0x2f, ATA_UDMA5, },
 111        { "vt82c686b",  PCI_DEVICE_ID_VIA_82C686,   0x40, 0x4f, ATA_UDMA5, },
 112        { "vt82c686a",  PCI_DEVICE_ID_VIA_82C686,   0x10, 0x2f, ATA_UDMA4, },
 113        { "vt82c686",   PCI_DEVICE_ID_VIA_82C686,   0x00, 0x0f, ATA_UDMA2, VIA_BAD_CLK66 },
 114        { "vt82c596b",  PCI_DEVICE_ID_VIA_82C596,   0x10, 0x2f, ATA_UDMA4, },
 115        { "vt82c596a",  PCI_DEVICE_ID_VIA_82C596,   0x00, 0x0f, ATA_UDMA2, VIA_BAD_CLK66 },
 116        { "vt82c586b",  PCI_DEVICE_ID_VIA_82C586_0, 0x47, 0x4f, ATA_UDMA2, VIA_SET_FIFO },
 117        { "vt82c586b",  PCI_DEVICE_ID_VIA_82C586_0, 0x40, 0x46, ATA_UDMA2, VIA_SET_FIFO | VIA_BAD_PREQ },
 118        { "vt82c586b",  PCI_DEVICE_ID_VIA_82C586_0, 0x30, 0x3f, ATA_UDMA2, VIA_SET_FIFO },
 119        { "vt82c586a",  PCI_DEVICE_ID_VIA_82C586_0, 0x20, 0x2f, ATA_UDMA2, VIA_SET_FIFO },
 120        { "vt82c586",   PCI_DEVICE_ID_VIA_82C586_0, 0x00, 0x0f,      0x00, VIA_SET_FIFO },
 121        { "vt82c576",   PCI_DEVICE_ID_VIA_82C576,   0x00, 0x2f,      0x00, VIA_SET_FIFO | VIA_NO_UNMASK },
 122        { "vt82c576",   PCI_DEVICE_ID_VIA_82C576,   0x00, 0x2f,      0x00, VIA_SET_FIFO | VIA_NO_UNMASK | VIA_BAD_ID },
 123        { "vtxxxx",     PCI_DEVICE_ID_VIA_ANON,     0x00, 0x2f, ATA_UDMA6, VIA_BAD_AST },
 124        { NULL }
 125};
 126
 127static const struct dmi_system_id no_atapi_dma_dmi_table[] = {
 128        {
 129                .ident = "AVERATEC 3200",
 130                .matches = {
 131                        DMI_MATCH(DMI_BOARD_VENDOR, "AVERATEC"),
 132                        DMI_MATCH(DMI_BOARD_NAME, "3200"),
 133                },
 134        },
 135        { }
 136};
 137
 138struct via_port {
 139        u8 cached_device;
 140};
 141
 142/*
 143 *      Cable special cases
 144 */
 145
 146static const struct dmi_system_id cable_dmi_table[] = {
 147        {
 148                .ident = "Acer Ferrari 3400",
 149                .matches = {
 150                        DMI_MATCH(DMI_BOARD_VENDOR, "Acer,Inc."),
 151                        DMI_MATCH(DMI_BOARD_NAME, "Ferrari 3400"),
 152                },
 153        },
 154        { }
 155};
 156
 157static int via_cable_override(struct pci_dev *pdev)
 158{
 159        /* Systems by DMI */
 160        if (dmi_check_system(cable_dmi_table))
 161                return 1;
 162        /* Arima W730-K8/Targa Visionary 811/... */
 163        if (pdev->subsystem_vendor == 0x161F && pdev->subsystem_device == 0x2032)
 164                return 1;
 165        return 0;
 166}
 167
 168
 169/**
 170 *      via_cable_detect        -       cable detection
 171 *      @ap: ATA port
 172 *
 173 *      Perform cable detection. Actually for the VIA case the BIOS
 174 *      already did this for us. We read the values provided by the
 175 *      BIOS. If you are using an 8235 in a non-PC configuration you
 176 *      may need to update this code.
 177 *
 178 *      Hotplug also impacts on this.
 179 */
 180
 181static int via_cable_detect(struct ata_port *ap) {
 182        const struct via_isa_bridge *config = ap->host->private_data;
 183        struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 184        u32 ata66;
 185
 186        if (via_cable_override(pdev))
 187                return ATA_CBL_PATA40_SHORT;
 188
 189        if ((config->flags & VIA_SATA_PATA) && ap->port_no == 0)
 190                return ATA_CBL_SATA;
 191
 192        /* Early chips are 40 wire */
 193        if (config->udma_mask < ATA_UDMA4)
 194                return ATA_CBL_PATA40;
 195        /* UDMA 66 chips have only drive side logic */
 196        else if (config->udma_mask < ATA_UDMA5)
 197                return ATA_CBL_PATA_UNK;
 198        /* UDMA 100 or later */
 199        pci_read_config_dword(pdev, 0x50, &ata66);
 200        /* Check both the drive cable reporting bits, we might not have
 201           two drives */
 202        if (ata66 & (0x10100000 >> (16 * ap->port_no)))
 203                return ATA_CBL_PATA80;
 204        /* Check with ACPI so we can spot BIOS reported SATA bridges */
 205        if (ata_acpi_init_gtm(ap) &&
 206            ata_acpi_cbl_80wire(ap, ata_acpi_init_gtm(ap)))
 207                return ATA_CBL_PATA80;
 208        return ATA_CBL_PATA40;
 209}
 210
 211static int via_pre_reset(struct ata_link *link, unsigned long deadline)
 212{
 213        struct ata_port *ap = link->ap;
 214        const struct via_isa_bridge *config = ap->host->private_data;
 215
 216        if (!(config->flags & VIA_NO_ENABLES)) {
 217                static const struct pci_bits via_enable_bits[] = {
 218                        { 0x40, 1, 0x02, 0x02 },
 219                        { 0x40, 1, 0x01, 0x01 }
 220                };
 221                struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 222                if (!pci_test_config_bits(pdev, &via_enable_bits[ap->port_no]))
 223                        return -ENOENT;
 224        }
 225
 226        return ata_sff_prereset(link, deadline);
 227}
 228
 229
 230/**
 231 *      via_do_set_mode -       set transfer mode data
 232 *      @ap: ATA interface
 233 *      @adev: ATA device
 234 *      @mode: ATA mode being programmed
 235 *      @set_ast: Set to program address setup
 236 *      @udma_type: UDMA mode/format of registers
 237 *
 238 *      Program the VIA registers for DMA and PIO modes. Uses the ata timing
 239 *      support in order to compute modes.
 240 *
 241 *      FIXME: Hotplug will require we serialize multiple mode changes
 242 *      on the two channels.
 243 */
 244
 245static void via_do_set_mode(struct ata_port *ap, struct ata_device *adev,
 246                            int mode, int set_ast, int udma_type)
 247{
 248        struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 249        struct ata_device *peer = ata_dev_pair(adev);
 250        struct ata_timing t, p;
 251        static int via_clock = 33333;   /* Bus clock in kHZ */
 252        unsigned long T =  1000000000 / via_clock;
 253        unsigned long UT = T;
 254        int ut;
 255        int offset = 3 - (2*ap->port_no) - adev->devno;
 256
 257        switch (udma_type) {
 258        case ATA_UDMA4:
 259                UT = T / 2; break;
 260        case ATA_UDMA5:
 261                UT = T / 3; break;
 262        case ATA_UDMA6:
 263                UT = T / 4; break;
 264        }
 265
 266        /* Calculate the timing values we require */
 267        ata_timing_compute(adev, mode, &t, T, UT);
 268
 269        /* We share 8bit timing so we must merge the constraints */
 270        if (peer) {
 271                if (peer->pio_mode) {
 272                        ata_timing_compute(peer, peer->pio_mode, &p, T, UT);
 273                        ata_timing_merge(&p, &t, &t, ATA_TIMING_8BIT);
 274                }
 275        }
 276
 277        /* Address setup is programmable but breaks on UDMA133 setups */
 278        if (set_ast) {
 279                u8 setup;       /* 2 bits per drive */
 280                int shift = 2 * offset;
 281
 282                pci_read_config_byte(pdev, 0x4C, &setup);
 283                setup &= ~(3 << shift);
 284                setup |= (clamp_val(t.setup, 1, 4) - 1) << shift;
 285                pci_write_config_byte(pdev, 0x4C, setup);
 286        }
 287
 288        /* Load the PIO mode bits */
 289        pci_write_config_byte(pdev, 0x4F - ap->port_no,
 290                ((clamp_val(t.act8b, 1, 16) - 1) << 4) | (clamp_val(t.rec8b, 1, 16) - 1));
 291        pci_write_config_byte(pdev, 0x48 + offset,
 292                ((clamp_val(t.active, 1, 16) - 1) << 4) | (clamp_val(t.recover, 1, 16) - 1));
 293
 294        /* Load the UDMA bits according to type */
 295        switch (udma_type) {
 296        case ATA_UDMA2:
 297        default:
 298                ut = t.udma ? (0xe0 | (clamp_val(t.udma, 2, 5) - 2)) : 0x03;
 299                break;
 300        case ATA_UDMA4:
 301                ut = t.udma ? (0xe8 | (clamp_val(t.udma, 2, 9) - 2)) : 0x0f;
 302                break;
 303        case ATA_UDMA5:
 304                ut = t.udma ? (0xe0 | (clamp_val(t.udma, 2, 9) - 2)) : 0x07;
 305                break;
 306        case ATA_UDMA6:
 307                ut = t.udma ? (0xe0 | (clamp_val(t.udma, 2, 9) - 2)) : 0x07;
 308                break;
 309        }
 310
 311        /* Set UDMA unless device is not UDMA capable */
 312        if (udma_type) {
 313                u8 udma_etc;
 314
 315                pci_read_config_byte(pdev, 0x50 + offset, &udma_etc);
 316
 317                /* clear transfer mode bit */
 318                udma_etc &= ~0x20;
 319
 320                if (t.udma) {
 321                        /* preserve 80-wire cable detection bit */
 322                        udma_etc &= 0x10;
 323                        udma_etc |= ut;
 324                }
 325
 326                pci_write_config_byte(pdev, 0x50 + offset, udma_etc);
 327        }
 328}
 329
 330static void via_set_piomode(struct ata_port *ap, struct ata_device *adev)
 331{
 332        const struct via_isa_bridge *config = ap->host->private_data;
 333        int set_ast = (config->flags & VIA_BAD_AST) ? 0 : 1;
 334
 335        via_do_set_mode(ap, adev, adev->pio_mode, set_ast, config->udma_mask);
 336}
 337
 338static void via_set_dmamode(struct ata_port *ap, struct ata_device *adev)
 339{
 340        const struct via_isa_bridge *config = ap->host->private_data;
 341        int set_ast = (config->flags & VIA_BAD_AST) ? 0 : 1;
 342
 343        via_do_set_mode(ap, adev, adev->dma_mode, set_ast, config->udma_mask);
 344}
 345
 346/**
 347 *      via_mode_filter         -       filter buggy device/mode pairs
 348 *      @dev: ATA device
 349 *      @mask: Mode bitmask
 350 *
 351 *      We need to apply some minimal filtering for old controllers and at least
 352 *      one breed of Transcend SSD. Return the updated mask.
 353 */
 354
 355static unsigned long via_mode_filter(struct ata_device *dev, unsigned long mask)
 356{
 357        struct ata_host *host = dev->link->ap->host;
 358        const struct via_isa_bridge *config = host->private_data;
 359        unsigned char model_num[ATA_ID_PROD_LEN + 1];
 360
 361        if (config->id == PCI_DEVICE_ID_VIA_82C586_0) {
 362                ata_id_c_string(dev->id, model_num, ATA_ID_PROD, sizeof(model_num));
 363                if (strcmp(model_num, "TS64GSSD25-M") == 0) {
 364                        ata_dev_warn(dev,
 365        "disabling UDMA mode due to reported lockups with this device\n");
 366                        mask &= ~ ATA_MASK_UDMA;
 367                }
 368        }
 369
 370        if (dev->class == ATA_DEV_ATAPI &&
 371            dmi_check_system(no_atapi_dma_dmi_table)) {
 372                ata_dev_warn(dev, "controller locks up on ATAPI DMA, forcing PIO\n");
 373                mask &= ATA_MASK_PIO;
 374        }
 375
 376        return mask;
 377}
 378
 379/**
 380 *      via_tf_load - send taskfile registers to host controller
 381 *      @ap: Port to which output is sent
 382 *      @tf: ATA taskfile register set
 383 *
 384 *      Outputs ATA taskfile to standard ATA host controller.
 385 *
 386 *      Note: This is to fix the internal bug of via chipsets, which
 387 *      will reset the device register after changing the IEN bit on
 388 *      ctl register
 389 */
 390static void via_tf_load(struct ata_port *ap, const struct ata_taskfile *tf)
 391{
 392        struct ata_ioports *ioaddr = &ap->ioaddr;
 393        struct via_port *vp = ap->private_data;
 394        unsigned int is_addr = tf->flags & ATA_TFLAG_ISADDR;
 395        int newctl = 0;
 396
 397        if (tf->ctl != ap->last_ctl) {
 398                iowrite8(tf->ctl, ioaddr->ctl_addr);
 399                ap->last_ctl = tf->ctl;
 400                ata_wait_idle(ap);
 401                newctl = 1;
 402        }
 403
 404        if (tf->flags & ATA_TFLAG_DEVICE) {
 405                iowrite8(tf->device, ioaddr->device_addr);
 406                vp->cached_device = tf->device;
 407        } else if (newctl)
 408                iowrite8(vp->cached_device, ioaddr->device_addr);
 409
 410        if (is_addr && (tf->flags & ATA_TFLAG_LBA48)) {
 411                WARN_ON_ONCE(!ioaddr->ctl_addr);
 412                iowrite8(tf->hob_feature, ioaddr->feature_addr);
 413                iowrite8(tf->hob_nsect, ioaddr->nsect_addr);
 414                iowrite8(tf->hob_lbal, ioaddr->lbal_addr);
 415                iowrite8(tf->hob_lbam, ioaddr->lbam_addr);
 416                iowrite8(tf->hob_lbah, ioaddr->lbah_addr);
 417                VPRINTK("hob: feat 0x%X nsect 0x%X, lba 0x%X 0x%X 0x%X\n",
 418                        tf->hob_feature,
 419                        tf->hob_nsect,
 420                        tf->hob_lbal,
 421                        tf->hob_lbam,
 422                        tf->hob_lbah);
 423        }
 424
 425        if (is_addr) {
 426                iowrite8(tf->feature, ioaddr->feature_addr);
 427                iowrite8(tf->nsect, ioaddr->nsect_addr);
 428                iowrite8(tf->lbal, ioaddr->lbal_addr);
 429                iowrite8(tf->lbam, ioaddr->lbam_addr);
 430                iowrite8(tf->lbah, ioaddr->lbah_addr);
 431                VPRINTK("feat 0x%X nsect 0x%X lba 0x%X 0x%X 0x%X\n",
 432                        tf->feature,
 433                        tf->nsect,
 434                        tf->lbal,
 435                        tf->lbam,
 436                        tf->lbah);
 437        }
 438
 439        ata_wait_idle(ap);
 440}
 441
 442static int via_port_start(struct ata_port *ap)
 443{
 444        struct via_port *vp;
 445        struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 446
 447        int ret = ata_bmdma_port_start(ap);
 448        if (ret < 0)
 449                return ret;
 450
 451        vp = devm_kzalloc(&pdev->dev, sizeof(struct via_port), GFP_KERNEL);
 452        if (vp == NULL)
 453                return -ENOMEM;
 454        ap->private_data = vp;
 455        return 0;
 456}
 457
 458static struct scsi_host_template via_sht = {
 459        ATA_BMDMA_SHT(DRV_NAME),
 460};
 461
 462static struct ata_port_operations via_port_ops = {
 463        .inherits       = &ata_bmdma_port_ops,
 464        .cable_detect   = via_cable_detect,
 465        .set_piomode    = via_set_piomode,
 466        .set_dmamode    = via_set_dmamode,
 467        .prereset       = via_pre_reset,
 468        .sff_tf_load    = via_tf_load,
 469        .port_start     = via_port_start,
 470        .mode_filter    = via_mode_filter,
 471};
 472
 473static struct ata_port_operations via_port_ops_noirq = {
 474        .inherits       = &via_port_ops,
 475        .sff_data_xfer  = ata_sff_data_xfer_noirq,
 476};
 477
 478/**
 479 *      via_config_fifo         -       set up the FIFO
 480 *      @pdev: PCI device
 481 *      @flags: configuration flags
 482 *
 483 *      Set the FIFO properties for this device if necessary. Used both on
 484 *      set up and on and the resume path
 485 */
 486
 487static void via_config_fifo(struct pci_dev *pdev, unsigned int flags)
 488{
 489        u8 enable;
 490
 491        /* 0x40 low bits indicate enabled channels */
 492        pci_read_config_byte(pdev, 0x40 , &enable);
 493        enable &= 3;
 494
 495        if (flags & VIA_SET_FIFO) {
 496                static const u8 fifo_setting[4] = {0x00, 0x60, 0x00, 0x20};
 497                u8 fifo;
 498
 499                pci_read_config_byte(pdev, 0x43, &fifo);
 500
 501                /* Clear PREQ# until DDACK# for errata */
 502                if (flags & VIA_BAD_PREQ)
 503                        fifo &= 0x7F;
 504                else
 505                        fifo &= 0x9f;
 506                /* Turn on FIFO for enabled channels */
 507                fifo |= fifo_setting[enable];
 508                pci_write_config_byte(pdev, 0x43, fifo);
 509        }
 510}
 511
 512static void via_fixup(struct pci_dev *pdev, const struct via_isa_bridge *config)
 513{
 514        u32 timing;
 515
 516        /* Initialise the FIFO for the enabled channels. */
 517        via_config_fifo(pdev, config->flags);
 518
 519        if (config->udma_mask == ATA_UDMA4) {
 520                /* The 66 MHz devices require we enable the clock */
 521                pci_read_config_dword(pdev, 0x50, &timing);
 522                timing |= 0x80008;
 523                pci_write_config_dword(pdev, 0x50, timing);
 524        }
 525        if (config->flags & VIA_BAD_CLK66) {
 526                /* Disable the 66MHz clock on problem devices */
 527                pci_read_config_dword(pdev, 0x50, &timing);
 528                timing &= ~0x80008;
 529                pci_write_config_dword(pdev, 0x50, timing);
 530        }
 531}
 532
 533/**
 534 *      via_init_one            -       discovery callback
 535 *      @pdev: PCI device
 536 *      @id: PCI table info
 537 *
 538 *      A VIA IDE interface has been discovered. Figure out what revision
 539 *      and perform configuration work before handing it to the ATA layer
 540 */
 541
 542static int via_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
 543{
 544        /* Early VIA without UDMA support */
 545        static const struct ata_port_info via_mwdma_info = {
 546                .flags = ATA_FLAG_SLAVE_POSS,
 547                .pio_mask = ATA_PIO4,
 548                .mwdma_mask = ATA_MWDMA2,
 549                .port_ops = &via_port_ops
 550        };
 551        /* Ditto with IRQ masking required */
 552        static const struct ata_port_info via_mwdma_info_borked = {
 553                .flags = ATA_FLAG_SLAVE_POSS,
 554                .pio_mask = ATA_PIO4,
 555                .mwdma_mask = ATA_MWDMA2,
 556                .port_ops = &via_port_ops_noirq,
 557        };
 558        /* VIA UDMA 33 devices (and borked 66) */
 559        static const struct ata_port_info via_udma33_info = {
 560                .flags = ATA_FLAG_SLAVE_POSS,
 561                .pio_mask = ATA_PIO4,
 562                .mwdma_mask = ATA_MWDMA2,
 563                .udma_mask = ATA_UDMA2,
 564                .port_ops = &via_port_ops
 565        };
 566        /* VIA UDMA 66 devices */
 567        static const struct ata_port_info via_udma66_info = {
 568                .flags = ATA_FLAG_SLAVE_POSS,
 569                .pio_mask = ATA_PIO4,
 570                .mwdma_mask = ATA_MWDMA2,
 571                .udma_mask = ATA_UDMA4,
 572                .port_ops = &via_port_ops
 573        };
 574        /* VIA UDMA 100 devices */
 575        static const struct ata_port_info via_udma100_info = {
 576                .flags = ATA_FLAG_SLAVE_POSS,
 577                .pio_mask = ATA_PIO4,
 578                .mwdma_mask = ATA_MWDMA2,
 579                .udma_mask = ATA_UDMA5,
 580                .port_ops = &via_port_ops
 581        };
 582        /* UDMA133 with bad AST (All current 133) */
 583        static const struct ata_port_info via_udma133_info = {
 584                .flags = ATA_FLAG_SLAVE_POSS,
 585                .pio_mask = ATA_PIO4,
 586                .mwdma_mask = ATA_MWDMA2,
 587                .udma_mask = ATA_UDMA6, /* FIXME: should check north bridge */
 588                .port_ops = &via_port_ops
 589        };
 590        const struct ata_port_info *ppi[] = { NULL, NULL };
 591        struct pci_dev *isa;
 592        const struct via_isa_bridge *config;
 593        u8 enable;
 594        unsigned long flags = id->driver_data;
 595        int rc;
 596
 597        ata_print_version_once(&pdev->dev, DRV_VERSION);
 598
 599        rc = pcim_enable_device(pdev);
 600        if (rc)
 601                return rc;
 602
 603        if (flags & VIA_IDFLAG_SINGLE)
 604                ppi[1] = &ata_dummy_port_info;
 605
 606        /* To find out how the IDE will behave and what features we
 607           actually have to look at the bridge not the IDE controller */
 608        for (config = via_isa_bridges; config->id != PCI_DEVICE_ID_VIA_ANON;
 609             config++)
 610                if ((isa = pci_get_device(PCI_VENDOR_ID_VIA +
 611                        !!(config->flags & VIA_BAD_ID),
 612                        config->id, NULL))) {
 613                        u8 rev = isa->revision;
 614                        pci_dev_put(isa);
 615
 616                        if ((id->device == 0x0415 || id->device == 0x3164) &&
 617                            (config->id != id->device))
 618                                continue;
 619
 620                        if (rev >= config->rev_min && rev <= config->rev_max)
 621                                break;
 622                }
 623
 624        if (!(config->flags & VIA_NO_ENABLES)) {
 625                /* 0x40 low bits indicate enabled channels */
 626                pci_read_config_byte(pdev, 0x40 , &enable);
 627                enable &= 3;
 628                if (enable == 0)
 629                        return -ENODEV;
 630        }
 631
 632        /* Clock set up */
 633        switch (config->udma_mask) {
 634        case 0x00:
 635                if (config->flags & VIA_NO_UNMASK)
 636                        ppi[0] = &via_mwdma_info_borked;
 637                else
 638                        ppi[0] = &via_mwdma_info;
 639                break;
 640        case ATA_UDMA2:
 641                ppi[0] = &via_udma33_info;
 642                break;
 643        case ATA_UDMA4:
 644                ppi[0] = &via_udma66_info;
 645                break;
 646        case ATA_UDMA5:
 647                ppi[0] = &via_udma100_info;
 648                break;
 649        case ATA_UDMA6:
 650                ppi[0] = &via_udma133_info;
 651                break;
 652        default:
 653                WARN_ON(1);
 654                return -ENODEV;
 655        }
 656
 657        via_fixup(pdev, config);
 658
 659        /* We have established the device type, now fire it up */
 660        return ata_pci_bmdma_init_one(pdev, ppi, &via_sht, (void *)config, 0);
 661}
 662
 663#ifdef CONFIG_PM
 664/**
 665 *      via_reinit_one          -       reinit after resume
 666 *      @pdev; PCI device
 667 *
 668 *      Called when the VIA PATA device is resumed. We must then
 669 *      reconfigure the fifo and other setup we may have altered. In
 670 *      addition the kernel needs to have the resume methods on PCI
 671 *      quirk supported.
 672 */
 673
 674static int via_reinit_one(struct pci_dev *pdev)
 675{
 676        struct ata_host *host = dev_get_drvdata(&pdev->dev);
 677        int rc;
 678
 679        rc = ata_pci_device_do_resume(pdev);
 680        if (rc)
 681                return rc;
 682
 683        via_fixup(pdev, host->private_data);
 684
 685        ata_host_resume(host);
 686        return 0;
 687}
 688#endif
 689
 690static const struct pci_device_id via[] = {
 691        { PCI_VDEVICE(VIA, 0x0415), },
 692        { PCI_VDEVICE(VIA, 0x0571), },
 693        { PCI_VDEVICE(VIA, 0x0581), },
 694        { PCI_VDEVICE(VIA, 0x1571), },
 695        { PCI_VDEVICE(VIA, 0x3164), },
 696        { PCI_VDEVICE(VIA, 0x5324), },
 697        { PCI_VDEVICE(VIA, 0xC409), VIA_IDFLAG_SINGLE },
 698        { PCI_VDEVICE(VIA, 0x9001), VIA_IDFLAG_SINGLE },
 699
 700        { },
 701};
 702
 703static struct pci_driver via_pci_driver = {
 704        .name           = DRV_NAME,
 705        .id_table       = via,
 706        .probe          = via_init_one,
 707        .remove         = ata_pci_remove_one,
 708#ifdef CONFIG_PM
 709        .suspend        = ata_pci_device_suspend,
 710        .resume         = via_reinit_one,
 711#endif
 712};
 713
 714module_pci_driver(via_pci_driver);
 715
 716MODULE_AUTHOR("Alan Cox");
 717MODULE_DESCRIPTION("low-level driver for VIA PATA");
 718MODULE_LICENSE("GPL");
 719MODULE_DEVICE_TABLE(pci, via);
 720MODULE_VERSION(DRV_VERSION);
 721
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