linux/drivers/ata/pata_acpi.c
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   1/*
   2 *      ACPI PATA driver
   3 *
   4 *      (c) 2007 Red Hat
   5 */
   6
   7#include <linux/kernel.h>
   8#include <linux/module.h>
   9#include <linux/pci.h>
  10#include <linux/init.h>
  11#include <linux/blkdev.h>
  12#include <linux/delay.h>
  13#include <linux/device.h>
  14#include <linux/gfp.h>
  15#include <scsi/scsi_host.h>
  16#include <acpi/acpi_bus.h>
  17
  18#include <linux/libata.h>
  19#include <linux/ata.h>
  20
  21#define DRV_NAME        "pata_acpi"
  22#define DRV_VERSION     "0.2.3"
  23
  24struct pata_acpi {
  25        struct ata_acpi_gtm gtm;
  26        void *last;
  27        unsigned long mask[2];
  28};
  29
  30/**
  31 *      pacpi_pre_reset -       check for 40/80 pin
  32 *      @ap: Port
  33 *      @deadline: deadline jiffies for the operation
  34 *
  35 *      Perform the PATA port setup we need.
  36 */
  37
  38static int pacpi_pre_reset(struct ata_link *link, unsigned long deadline)
  39{
  40        struct ata_port *ap = link->ap;
  41        struct pata_acpi *acpi = ap->private_data;
  42        if (ata_ap_acpi_handle(ap) == NULL || ata_acpi_gtm(ap, &acpi->gtm) < 0)
  43                return -ENODEV;
  44
  45        return ata_sff_prereset(link, deadline);
  46}
  47
  48/**
  49 *      pacpi_cable_detect      -       cable type detection
  50 *      @ap: port to detect
  51 *
  52 *      Perform device specific cable detection
  53 */
  54
  55static int pacpi_cable_detect(struct ata_port *ap)
  56{
  57        struct pata_acpi *acpi = ap->private_data;
  58
  59        if ((acpi->mask[0] | acpi->mask[1]) & (0xF8 << ATA_SHIFT_UDMA))
  60                return ATA_CBL_PATA80;
  61        else
  62                return ATA_CBL_PATA40;
  63}
  64
  65/**
  66 *      pacpi_discover_modes    -       filter non ACPI modes
  67 *      @adev: ATA device
  68 *      @mask: proposed modes
  69 *
  70 *      Try the modes available and see which ones the ACPI method will
  71 *      set up sensibly. From this we get a mask of ACPI modes we can use
  72 */
  73
  74static unsigned long pacpi_discover_modes(struct ata_port *ap, struct ata_device *adev)
  75{
  76        struct pata_acpi *acpi = ap->private_data;
  77        struct ata_acpi_gtm probe;
  78        unsigned int xfer_mask;
  79
  80        probe = acpi->gtm;
  81
  82        ata_acpi_gtm(ap, &probe);
  83
  84        xfer_mask = ata_acpi_gtm_xfermask(adev, &probe);
  85
  86        if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA))
  87                ap->cbl = ATA_CBL_PATA80;
  88
  89        return xfer_mask;
  90}
  91
  92/**
  93 *      pacpi_mode_filter       -       mode filter for ACPI
  94 *      @adev: device
  95 *      @mask: mask of valid modes
  96 *
  97 *      Filter the valid mode list according to our own specific rules, in
  98 *      this case the list of discovered valid modes obtained by ACPI probing
  99 */
 100
 101static unsigned long pacpi_mode_filter(struct ata_device *adev, unsigned long mask)
 102{
 103        struct pata_acpi *acpi = adev->link->ap->private_data;
 104        return mask & acpi->mask[adev->devno];
 105}
 106
 107/**
 108 *      pacpi_set_piomode       -       set initial PIO mode data
 109 *      @ap: ATA interface
 110 *      @adev: ATA device
 111 */
 112
 113static void pacpi_set_piomode(struct ata_port *ap, struct ata_device *adev)
 114{
 115        int unit = adev->devno;
 116        struct pata_acpi *acpi = ap->private_data;
 117        const struct ata_timing *t;
 118
 119        if (!(acpi->gtm.flags & 0x10))
 120                unit = 0;
 121
 122        /* Now stuff the nS values into the structure */
 123        t = ata_timing_find_mode(adev->pio_mode);
 124        acpi->gtm.drive[unit].pio = t->cycle;
 125        ata_acpi_stm(ap, &acpi->gtm);
 126        /* See what mode we actually got */
 127        ata_acpi_gtm(ap, &acpi->gtm);
 128}
 129
 130/**
 131 *      pacpi_set_dmamode       -       set initial DMA mode data
 132 *      @ap: ATA interface
 133 *      @adev: ATA device
 134 */
 135
 136static void pacpi_set_dmamode(struct ata_port *ap, struct ata_device *adev)
 137{
 138        int unit = adev->devno;
 139        struct pata_acpi *acpi = ap->private_data;
 140        const struct ata_timing *t;
 141
 142        if (!(acpi->gtm.flags & 0x10))
 143                unit = 0;
 144
 145        /* Now stuff the nS values into the structure */
 146        t = ata_timing_find_mode(adev->dma_mode);
 147        if (adev->dma_mode >= XFER_UDMA_0) {
 148                acpi->gtm.drive[unit].dma = t->udma;
 149                acpi->gtm.flags |= (1 << (2 * unit));
 150        } else {
 151                acpi->gtm.drive[unit].dma = t->cycle;
 152                acpi->gtm.flags &= ~(1 << (2 * unit));
 153        }
 154        ata_acpi_stm(ap, &acpi->gtm);
 155        /* See what mode we actually got */
 156        ata_acpi_gtm(ap, &acpi->gtm);
 157}
 158
 159/**
 160 *      pacpi_qc_issue  -       command issue
 161 *      @qc: command pending
 162 *
 163 *      Called when the libata layer is about to issue a command. We wrap
 164 *      this interface so that we can load the correct ATA timings if
 165 *      necessary.
 166 */
 167
 168static unsigned int pacpi_qc_issue(struct ata_queued_cmd *qc)
 169{
 170        struct ata_port *ap = qc->ap;
 171        struct ata_device *adev = qc->dev;
 172        struct pata_acpi *acpi = ap->private_data;
 173
 174        if (acpi->gtm.flags & 0x10)
 175                return ata_bmdma_qc_issue(qc);
 176
 177        if (adev != acpi->last) {
 178                pacpi_set_piomode(ap, adev);
 179                if (ata_dma_enabled(adev))
 180                        pacpi_set_dmamode(ap, adev);
 181                acpi->last = adev;
 182        }
 183        return ata_bmdma_qc_issue(qc);
 184}
 185
 186/**
 187 *      pacpi_port_start        -       port setup
 188 *      @ap: ATA port being set up
 189 *
 190 *      Use the port_start hook to maintain private control structures
 191 */
 192
 193static int pacpi_port_start(struct ata_port *ap)
 194{
 195        struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 196        struct pata_acpi *acpi;
 197
 198        if (ata_ap_acpi_handle(ap) == NULL)
 199                return -ENODEV;
 200
 201        acpi = ap->private_data = devm_kzalloc(&pdev->dev, sizeof(struct pata_acpi), GFP_KERNEL);
 202        if (ap->private_data == NULL)
 203                return -ENOMEM;
 204        acpi->mask[0] = pacpi_discover_modes(ap, &ap->link.device[0]);
 205        acpi->mask[1] = pacpi_discover_modes(ap, &ap->link.device[1]);
 206        return ata_bmdma_port_start(ap);
 207}
 208
 209static struct scsi_host_template pacpi_sht = {
 210        ATA_BMDMA_SHT(DRV_NAME),
 211};
 212
 213static struct ata_port_operations pacpi_ops = {
 214        .inherits               = &ata_bmdma_port_ops,
 215        .qc_issue               = pacpi_qc_issue,
 216        .cable_detect           = pacpi_cable_detect,
 217        .mode_filter            = pacpi_mode_filter,
 218        .set_piomode            = pacpi_set_piomode,
 219        .set_dmamode            = pacpi_set_dmamode,
 220        .prereset               = pacpi_pre_reset,
 221        .port_start             = pacpi_port_start,
 222};
 223
 224
 225/**
 226 *      pacpi_init_one - Register ACPI ATA PCI device with kernel services
 227 *      @pdev: PCI device to register
 228 *      @ent: Entry in pacpi_pci_tbl matching with @pdev
 229 *
 230 *      Called from kernel PCI layer.
 231 *
 232 *      LOCKING:
 233 *      Inherited from PCI layer (may sleep).
 234 *
 235 *      RETURNS:
 236 *      Zero on success, or -ERRNO value.
 237 */
 238
 239static int pacpi_init_one (struct pci_dev *pdev, const struct pci_device_id *id)
 240{
 241        static const struct ata_port_info info = {
 242                .flags          = ATA_FLAG_SLAVE_POSS,
 243
 244                .pio_mask       = ATA_PIO4,
 245                .mwdma_mask     = ATA_MWDMA2,
 246                .udma_mask      = ATA_UDMA6,
 247
 248                .port_ops       = &pacpi_ops,
 249        };
 250        const struct ata_port_info *ppi[] = { &info, NULL };
 251        if (pdev->vendor == PCI_VENDOR_ID_ATI) {
 252                int rc = pcim_enable_device(pdev);
 253                if (rc < 0)
 254                        return rc;
 255                pcim_pin_device(pdev);
 256        }
 257        return ata_pci_bmdma_init_one(pdev, ppi, &pacpi_sht, NULL, 0);
 258}
 259
 260static const struct pci_device_id pacpi_pci_tbl[] = {
 261        { PCI_ANY_ID,           PCI_ANY_ID,                        PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_STORAGE_IDE << 8, 0xFFFFFF00UL, 1},
 262        { }     /* terminate list */
 263};
 264
 265static struct pci_driver pacpi_pci_driver = {
 266        .name                   = DRV_NAME,
 267        .id_table               = pacpi_pci_tbl,
 268        .probe                  = pacpi_init_one,
 269        .remove                 = ata_pci_remove_one,
 270#ifdef CONFIG_PM
 271        .suspend                = ata_pci_device_suspend,
 272        .resume                 = ata_pci_device_resume,
 273#endif
 274};
 275
 276module_pci_driver(pacpi_pci_driver);
 277
 278MODULE_AUTHOR("Alan Cox");
 279MODULE_DESCRIPTION("SCSI low-level driver for ATA in ACPI mode");
 280MODULE_LICENSE("GPL");
 281MODULE_DEVICE_TABLE(pci, pacpi_pci_tbl);
 282MODULE_VERSION(DRV_VERSION);
 283
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