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