drivers/ata/pata_acpi.c

   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
  24 struct 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
  38 static 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 (ap->acpi_handle == 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
  55 static 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
  74 static 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
 101 static 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
 113 static 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
 136 static 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
 168 static 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
 193 static 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         int ret;
 199
 200         if (ap->acpi_handle == NULL)
 201                 return -ENODEV;
 202
 203         acpi = ap->private_data = devm_kzalloc(&pdev->dev, sizeof(struct pata_acpi), GFP_KERNEL);
 204         if (ap->private_data == NULL)
 205                 return -ENOMEM;
 206         acpi->mask[0] = pacpi_discover_modes(ap, &ap->link.device[0]);
 207         acpi->mask[1] = pacpi_discover_modes(ap, &ap->link.device[1]);
 208         ret = ata_bmdma_port_start(ap);
 209         if (ret < 0)
 210                 return ret;
 211
 212         return ret;
 213 }
 214
 215 static struct scsi_host_template pacpi_sht = {
 216         ATA_BMDMA_SHT(DRV_NAME),
 217 };
 218
 219 static struct ata_port_operations pacpi_ops = {
 220         .inherits               = &ata_bmdma_port_ops,
 221         .qc_issue               = pacpi_qc_issue,
 222         .cable_detect           = pacpi_cable_detect,
 223         .mode_filter            = pacpi_mode_filter,
 224         .set_piomode            = pacpi_set_piomode,
 225         .set_dmamode            = pacpi_set_dmamode,
 226         .prereset               = pacpi_pre_reset,
 227         .port_start             = pacpi_port_start,
 228 };
 229
 230
 231 /**
 232  *      pacpi_init_one - Register ACPI ATA PCI device with kernel services
 233  *      @pdev: PCI device to register
 234  *      @ent: Entry in pacpi_pci_tbl matching with @pdev
 235  *
 236  *      Called from kernel PCI layer.
 237  *
 238  *      LOCKING:
 239  *      Inherited from PCI layer (may sleep).
 240  *
 241  *      RETURNS:
 242  *      Zero on success, or -ERRNO value.
 243  */
 244
 245 static int pacpi_init_one (struct pci_dev *pdev, const struct pci_device_id *id)
 246 {
 247         static const struct ata_port_info info = {
 248                 .flags          = ATA_FLAG_SLAVE_POSS,
 249
 250                 .pio_mask       = ATA_PIO4,
 251                 .mwdma_mask     = ATA_MWDMA2,
 252                 .udma_mask      = ATA_UDMA6,
 253
 254                 .port_ops       = &pacpi_ops,
 255         };
 256         const struct ata_port_info *ppi[] = { &info, NULL };
 257         if (pdev->vendor == PCI_VENDOR_ID_ATI) {
 258                 int rc = pcim_enable_device(pdev);
 259                 if (rc < 0)
 260                         return rc;
 261                 pcim_pin_device(pdev);
 262         }
 263         return ata_pci_bmdma_init_one(pdev, ppi, &pacpi_sht, NULL, 0);
 264 }
 265
 266 static const struct pci_device_id pacpi_pci_tbl[] = {
 267         { PCI_ANY_ID,           PCI_ANY_ID,                        PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_STORAGE_IDE << 8, 0xFFFFFF00UL, 1},
 268         { }     /* terminate list */
 269 };
 270
 271 static struct pci_driver pacpi_pci_driver = {
 272         .name                   = DRV_NAME,
 273         .id_table               = pacpi_pci_tbl,
 274         .probe                  = pacpi_init_one,
 275         .remove                 = ata_pci_remove_one,
 276 #ifdef CONFIG_PM
 277         .suspend                = ata_pci_device_suspend,
 278         .resume                 = ata_pci_device_resume,
 279 #endif
 280 };
 281
 282 static int __init pacpi_init(void)
 283 {
 284         return pci_register_driver(&pacpi_pci_driver);
 285 }
 286
 287 static void __exit pacpi_exit(void)
 288 {
 289         pci_unregister_driver(&pacpi_pci_driver);
 290 }
 291
 292 module_init(pacpi_init);
 293 module_exit(pacpi_exit);
 294
 295 MODULE_AUTHOR("Alan Cox");
 296 MODULE_DESCRIPTION("SCSI low-level driver for ATA in ACPI mode");
 297 MODULE_LICENSE("GPL");
 298 MODULE_DEVICE_TABLE(pci, pacpi_pci_tbl);
 299 MODULE_VERSION(DRV_VERSION);
 300