drivers/ata/pata_acpi.c

   1 /*
   2  *      ACPI PATA driver
   3  *
   4  *      (c) 2007 Red Hat  <alan@redhat.com>
   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 <scsi/scsi_host.h>
  15 #include <acpi/acpi_bus.h>
  16 #include <acpi/acnames.h>
  17 #include <acpi/acnamesp.h>
  18 #include <acpi/acparser.h>
  19 #include <acpi/acexcep.h>
  20 #include <acpi/acmacros.h>
  21 #include <acpi/actypes.h>
  22
  23 #include <linux/libata.h>
  24 #include <linux/ata.h>
  25
  26 #define DRV_NAME        "pata_acpi"
  27 #define DRV_VERSION     "0.2.3"
  28
  29 struct pata_acpi {
  30         struct ata_acpi_gtm gtm;
  31         void *last;
  32         unsigned long mask[2];
  33 };
  34
  35 /**
  36  *      pacpi_pre_reset -       check for 40/80 pin
  37  *      @ap: Port
  38  *      @deadline: deadline jiffies for the operation
  39  *
  40  *      Perform the PATA port setup we need.
  41  */
  42
  43 static int pacpi_pre_reset(struct ata_link *link, unsigned long deadline)
  44 {
  45         struct ata_port *ap = link->ap;
  46         struct pata_acpi *acpi = ap->private_data;
  47         if (ap->acpi_handle == NULL || ata_acpi_gtm(ap, &acpi->gtm) < 0)
  48                 return -ENODEV;
  49
  50         return ata_sff_prereset(link, deadline);
  51 }
  52
  53 /**
  54  *      pacpi_cable_detect      -       cable type detection
  55  *      @ap: port to detect
  56  *
  57  *      Perform device specific cable detection
  58  */
  59
  60 static int pacpi_cable_detect(struct ata_port *ap)
  61 {
  62         struct pata_acpi *acpi = ap->private_data;
  63
  64         if ((acpi->mask[0] | acpi->mask[1]) & (0xF8 << ATA_SHIFT_UDMA))
  65                 return ATA_CBL_PATA80;
  66         else
  67                 return ATA_CBL_PATA40;
  68 }
  69
  70 /**
  71  *      pacpi_discover_modes    -       filter non ACPI modes
  72  *      @adev: ATA device
  73  *      @mask: proposed modes
  74  *
  75  *      Try the modes available and see which ones the ACPI method will
  76  *      set up sensibly. From this we get a mask of ACPI modes we can use
  77  */
  78
  79 static unsigned long pacpi_discover_modes(struct ata_port *ap, struct ata_device *adev)
  80 {
  81         struct pata_acpi *acpi = ap->private_data;
  82         struct ata_acpi_gtm probe;
  83         unsigned int xfer_mask;
  84
  85         probe = acpi->gtm;
  86
  87         ata_acpi_gtm(ap, &probe);
  88
  89         xfer_mask = ata_acpi_gtm_xfermask(adev, &probe);
  90
  91         if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA))
  92                 ap->cbl = ATA_CBL_PATA80;
  93
  94         return xfer_mask;
  95 }
  96
  97 /**
  98  *      pacpi_mode_filter       -       mode filter for ACPI
  99  *      @adev: device
 100  *      @mask: mask of valid modes
 101  *
 102  *      Filter the valid mode list according to our own specific rules, in
 103  *      this case the list of discovered valid modes obtained by ACPI probing
 104  */
 105
 106 static unsigned long pacpi_mode_filter(struct ata_device *adev, unsigned long mask)
 107 {
 108         struct pata_acpi *acpi = adev->link->ap->private_data;
 109         return ata_bmdma_mode_filter(adev, mask & acpi->mask[adev->devno]);
 110 }
 111
 112 /**
 113  *      pacpi_set_piomode       -       set initial PIO mode data
 114  *      @ap: ATA interface
 115  *      @adev: ATA device
 116  */
 117
 118 static void pacpi_set_piomode(struct ata_port *ap, struct ata_device *adev)
 119 {
 120         int unit = adev->devno;
 121         struct pata_acpi *acpi = ap->private_data;
 122         const struct ata_timing *t;
 123
 124         if (!(acpi->gtm.flags & 0x10))
 125                 unit = 0;
 126
 127         /* Now stuff the nS values into the structure */
 128         t = ata_timing_find_mode(adev->pio_mode);
 129         acpi->gtm.drive[unit].pio = t->cycle;
 130         ata_acpi_stm(ap, &acpi->gtm);
 131         /* See what mode we actually got */
 132         ata_acpi_gtm(ap, &acpi->gtm);
 133 }
 134
 135 /**
 136  *      pacpi_set_dmamode       -       set initial DMA mode data
 137  *      @ap: ATA interface
 138  *      @adev: ATA device
 139  */
 140
 141 static void pacpi_set_dmamode(struct ata_port *ap, struct ata_device *adev)
 142 {
 143         int unit = adev->devno;
 144         struct pata_acpi *acpi = ap->private_data;
 145         const struct ata_timing *t;
 146
 147         if (!(acpi->gtm.flags & 0x10))
 148                 unit = 0;
 149
 150         /* Now stuff the nS values into the structure */
 151         t = ata_timing_find_mode(adev->dma_mode);
 152         if (adev->dma_mode >= XFER_UDMA_0) {
 153                 acpi->gtm.drive[unit].dma = t->udma;
 154                 acpi->gtm.flags |= (1 << (2 * unit));
 155         } else {
 156                 acpi->gtm.drive[unit].dma = t->cycle;
 157                 acpi->gtm.flags &= ~(1 << (2 * unit));
 158         }
 159         ata_acpi_stm(ap, &acpi->gtm);
 160         /* See what mode we actually got */
 161         ata_acpi_gtm(ap, &acpi->gtm);
 162 }
 163
 164 /**
 165  *      pacpi_qc_issue  -       command issue
 166  *      @qc: command pending
 167  *
 168  *      Called when the libata layer is about to issue a command. We wrap
 169  *      this interface so that we can load the correct ATA timings if
 170  *      neccessary.
 171  */
 172
 173 static unsigned int pacpi_qc_issue(struct ata_queued_cmd *qc)
 174 {
 175         struct ata_port *ap = qc->ap;
 176         struct ata_device *adev = qc->dev;
 177         struct pata_acpi *acpi = ap->private_data;
 178
 179         if (acpi->gtm.flags & 0x10)
 180                 return ata_sff_qc_issue(qc);
 181
 182         if (adev != acpi->last) {
 183                 pacpi_set_piomode(ap, adev);
 184                 if (adev->dma_mode)
 185                         pacpi_set_dmamode(ap, adev);
 186                 acpi->last = adev;
 187         }
 188         return ata_sff_qc_issue(qc);
 189 }
 190
 191 /**
 192  *      pacpi_port_start        -       port setup
 193  *      @ap: ATA port being set up
 194  *
 195  *      Use the port_start hook to maintain private control structures
 196  */
 197
 198 static int pacpi_port_start(struct ata_port *ap)
 199 {
 200         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 201         struct pata_acpi *acpi;
 202
 203         int ret;
 204
 205         if (ap->acpi_handle == NULL)
 206                 return -ENODEV;
 207
 208         acpi = ap->private_data = devm_kzalloc(&pdev->dev, sizeof(struct pata_acpi), GFP_KERNEL);
 209         if (ap->private_data == NULL)
 210                 return -ENOMEM;
 211         acpi->mask[0] = pacpi_discover_modes(ap, &ap->link.device[0]);
 212         acpi->mask[1] = pacpi_discover_modes(ap, &ap->link.device[1]);
 213         ret = ata_sff_port_start(ap);
 214         if (ret < 0)
 215                 return ret;
 216
 217         return ret;
 218 }
 219
 220 static struct scsi_host_template pacpi_sht = {
 221         ATA_BMDMA_SHT(DRV_NAME),
 222 };
 223
 224 static struct ata_port_operations pacpi_ops = {
 225         .inherits               = &ata_bmdma_port_ops,
 226         .qc_issue               = pacpi_qc_issue,
 227         .cable_detect           = pacpi_cable_detect,
 228         .mode_filter            = pacpi_mode_filter,
 229         .set_piomode            = pacpi_set_piomode,
 230         .set_dmamode            = pacpi_set_dmamode,
 231         .prereset               = pacpi_pre_reset,
 232         .port_start             = pacpi_port_start,
 233 };
 234
 235
 236 /**
 237  *      pacpi_init_one - Register ACPI ATA PCI device with kernel services
 238  *      @pdev: PCI device to register
 239  *      @ent: Entry in pacpi_pci_tbl matching with @pdev
 240  *
 241  *      Called from kernel PCI layer.
 242  *
 243  *      LOCKING:
 244  *      Inherited from PCI layer (may sleep).
 245  *
 246  *      RETURNS:
 247  *      Zero on success, or -ERRNO value.
 248  */
 249
 250 static int pacpi_init_one (struct pci_dev *pdev, const struct pci_device_id *id)
 251 {
 252         static const struct ata_port_info info = {
 253                 .flags          = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
 254
 255                 .pio_mask       = 0x1f,
 256                 .mwdma_mask     = 0x07,
 257                 .udma_mask      = 0x7f,
 258
 259                 .port_ops       = &pacpi_ops,
 260         };
 261         const struct ata_port_info *ppi[] = { &info, NULL };
 262         return ata_pci_sff_init_one(pdev, ppi, &pacpi_sht, NULL);
 263 }
 264
 265 static const struct pci_device_id pacpi_pci_tbl[] = {
 266         { PCI_ANY_ID,           PCI_ANY_ID,                        PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_STORAGE_IDE << 8, 0xFFFFFF00UL, 1},
 267         { }     /* terminate list */
 268 };
 269
 270 static struct pci_driver pacpi_pci_driver = {
 271         .name                   = DRV_NAME,
 272         .id_table               = pacpi_pci_tbl,
 273         .probe                  = pacpi_init_one,
 274         .remove                 = ata_pci_remove_one,
 275 #ifdef CONFIG_PM
 276         .suspend                = ata_pci_device_suspend,
 277         .resume                 = ata_pci_device_resume,
 278 #endif
 279 };
 280
 281 static int __init pacpi_init(void)
 282 {
 283         return pci_register_driver(&pacpi_pci_driver);
 284 }
 285
 286 static void __exit pacpi_exit(void)
 287 {
 288         pci_unregister_driver(&pacpi_pci_driver);
 289 }
 290
 291 module_init(pacpi_init);
 292 module_exit(pacpi_exit);
 293
 294 MODULE_AUTHOR("Alan Cox");
 295 MODULE_DESCRIPTION("SCSI low-level driver for ATA in ACPI mode");
 296 MODULE_LICENSE("GPL");
 297 MODULE_DEVICE_TABLE(pci, pacpi_pci_tbl);
 298 MODULE_VERSION(DRV_VERSION);
 299