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 <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
  23 struct 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
  37 static 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 (ap->acpi_handle == 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
  54 static 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
  73 static 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
 100 static 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 ata_bmdma_mode_filter(adev, 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
 112 static 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
 135 static 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  *      neccessary.
 165  */
 166
 167 static 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_sff_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_sff_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
 192 static 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         int ret;
 198
 199         if (ap->acpi_handle == NULL)
 200                 return -ENODEV;
 201
 202         acpi = ap->private_data = devm_kzalloc(&pdev->dev, sizeof(struct pata_acpi), GFP_KERNEL);
 203         if (ap->private_data == NULL)
 204                 return -ENOMEM;
 205         acpi->mask[0] = pacpi_discover_modes(ap, &ap->link.device[0]);
 206         acpi->mask[1] = pacpi_discover_modes(ap, &ap->link.device[1]);
 207         ret = ata_sff_port_start(ap);
 208         if (ret < 0)
 209                 return ret;
 210
 211         return ret;
 212 }
 213
 214 static struct scsi_host_template pacpi_sht = {
 215         ATA_BMDMA_SHT(DRV_NAME),
 216 };
 217
 218 static struct ata_port_operations pacpi_ops = {
 219         .inherits               = &ata_bmdma_port_ops,
 220         .qc_issue               = pacpi_qc_issue,
 221         .cable_detect           = pacpi_cable_detect,
 222         .mode_filter            = pacpi_mode_filter,
 223         .set_piomode            = pacpi_set_piomode,
 224         .set_dmamode            = pacpi_set_dmamode,
 225         .prereset               = pacpi_pre_reset,
 226         .port_start             = pacpi_port_start,
 227 };
 228
 229
 230 /**
 231  *      pacpi_init_one - Register ACPI ATA PCI device with kernel services
 232  *      @pdev: PCI device to register
 233  *      @ent: Entry in pacpi_pci_tbl matching with @pdev
 234  *
 235  *      Called from kernel PCI layer.
 236  *
 237  *      LOCKING:
 238  *      Inherited from PCI layer (may sleep).
 239  *
 240  *      RETURNS:
 241  *      Zero on success, or -ERRNO value.
 242  */
 243
 244 static int pacpi_init_one (struct pci_dev *pdev, const struct pci_device_id *id)
 245 {
 246         static const struct ata_port_info info = {
 247                 .flags          = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
 248
 249                 .pio_mask       = ATA_PIO4,
 250                 .mwdma_mask     = ATA_MWDMA2,
 251                 .udma_mask      = ATA_UDMA6,
 252
 253                 .port_ops       = &pacpi_ops,
 254         };
 255         const struct ata_port_info *ppi[] = { &info, NULL };
 256         if (pdev->vendor == PCI_VENDOR_ID_ATI) {
 257                 int rc = pcim_enable_device(pdev);
 258                 if (rc < 0)
 259                         return rc;
 260                 pcim_pin_device(pdev);
 261         }
 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