Alan Cox | 025621f | 2007-10-04 21:32:58 +0100 | [diff] [blame^] | 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_std_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_error_handler - Setup and error handler |
| 72 | * @ap: Port to handle |
| 73 | * |
| 74 | * LOCKING: |
| 75 | * None (inherited from caller). |
| 76 | */ |
| 77 | |
| 78 | static void pacpi_error_handler(struct ata_port *ap) |
| 79 | { |
| 80 | return ata_bmdma_drive_eh(ap, pacpi_pre_reset, ata_std_softreset, |
| 81 | NULL, ata_std_postreset); |
| 82 | } |
| 83 | |
| 84 | /* Welcome to ACPI, bring a bucket */ |
| 85 | static const unsigned int pio_cycle[7] = { |
| 86 | 600, 383, 240, 180, 120, 100, 80 |
| 87 | }; |
| 88 | static const unsigned int mwdma_cycle[5] = { |
| 89 | 480, 150, 120, 100, 80 |
| 90 | }; |
| 91 | static const unsigned int udma_cycle[7] = { |
| 92 | 120, 80, 60, 45, 30, 20, 15 |
| 93 | }; |
| 94 | |
| 95 | /** |
| 96 | * pacpi_discover_modes - filter non ACPI modes |
| 97 | * @adev: ATA device |
| 98 | * @mask: proposed modes |
| 99 | * |
| 100 | * Try the modes available and see which ones the ACPI method will |
| 101 | * set up sensibly. From this we get a mask of ACPI modes we can use |
| 102 | */ |
| 103 | |
| 104 | static unsigned long pacpi_discover_modes(struct ata_port *ap, struct ata_device *adev) |
| 105 | { |
| 106 | int unit = adev->devno; |
| 107 | struct pata_acpi *acpi = ap->private_data; |
| 108 | int i; |
| 109 | u32 t; |
| 110 | unsigned long mask = (0x7f << ATA_SHIFT_UDMA) | (0x7 << ATA_SHIFT_MWDMA) | (0x1F << ATA_SHIFT_PIO); |
| 111 | |
| 112 | struct ata_acpi_gtm probe; |
| 113 | |
| 114 | probe = acpi->gtm; |
| 115 | |
| 116 | /* We always use the 0 slot for crap hardware */ |
| 117 | if (!(probe.flags & 0x10)) |
| 118 | unit = 0; |
| 119 | |
| 120 | ata_acpi_gtm(ap, &probe); |
| 121 | |
| 122 | /* Start by scanning for PIO modes */ |
| 123 | for (i = 0; i < 7; i++) { |
| 124 | t = probe.drive[unit].pio; |
| 125 | if (t <= pio_cycle[i]) { |
| 126 | mask |= (2 << (ATA_SHIFT_PIO + i)) - 1; |
| 127 | break; |
| 128 | } |
| 129 | } |
| 130 | |
| 131 | /* See if we have MWDMA or UDMA data. We don't bother with MWDMA |
| 132 | if UDMA is availabe as this means the BIOS set UDMA and our |
| 133 | error changedown if it works is UDMA to PIO anyway */ |
| 134 | if (probe.flags & (1 << (2 * unit))) { |
| 135 | /* MWDMA */ |
| 136 | for (i = 0; i < 5; i++) { |
| 137 | t = probe.drive[unit].dma; |
| 138 | if (t <= mwdma_cycle[i]) { |
| 139 | mask |= (2 << (ATA_SHIFT_MWDMA + i)) - 1; |
| 140 | break; |
| 141 | } |
| 142 | } |
| 143 | } else { |
| 144 | /* UDMA */ |
| 145 | for (i = 0; i < 7; i++) { |
| 146 | t = probe.drive[unit].dma; |
| 147 | if (t <= udma_cycle[i]) { |
| 148 | mask |= (2 << (ATA_SHIFT_UDMA + i)) - 1; |
| 149 | break; |
| 150 | } |
| 151 | } |
| 152 | } |
| 153 | if (mask & (0xF8 << ATA_SHIFT_UDMA)) |
| 154 | ap->cbl = ATA_CBL_PATA80; |
| 155 | return mask; |
| 156 | } |
| 157 | |
| 158 | /** |
| 159 | * pacpi_mode_filter - mode filter for ACPI |
| 160 | * @adev: device |
| 161 | * @mask: mask of valid modes |
| 162 | * |
| 163 | * Filter the valid mode list according to our own specific rules, in |
| 164 | * this case the list of discovered valid modes obtained by ACPI probing |
| 165 | */ |
| 166 | |
| 167 | static unsigned long pacpi_mode_filter(struct ata_device *adev, unsigned long mask) |
| 168 | { |
| 169 | struct pata_acpi *acpi = adev->link->ap->private_data; |
| 170 | return ata_pci_default_filter(adev, mask & acpi->mask[adev->devno]); |
| 171 | } |
| 172 | |
| 173 | /** |
| 174 | * pacpi_set_piomode - set initial PIO mode data |
| 175 | * @ap: ATA interface |
| 176 | * @adev: ATA device |
| 177 | */ |
| 178 | |
| 179 | static void pacpi_set_piomode(struct ata_port *ap, struct ata_device *adev) |
| 180 | { |
| 181 | int unit = adev->devno; |
| 182 | struct pata_acpi *acpi = ap->private_data; |
| 183 | |
| 184 | if(!(acpi->gtm.flags & 0x10)) |
| 185 | unit = 0; |
| 186 | |
| 187 | /* Now stuff the nS values into the structure */ |
| 188 | acpi->gtm.drive[unit].pio = pio_cycle[adev->pio_mode - XFER_PIO_0]; |
| 189 | ata_acpi_stm(ap, &acpi->gtm); |
| 190 | /* See what mode we actually got */ |
| 191 | ata_acpi_gtm(ap, &acpi->gtm); |
| 192 | } |
| 193 | |
| 194 | /** |
| 195 | * pacpi_set_dmamode - set initial DMA mode data |
| 196 | * @ap: ATA interface |
| 197 | * @adev: ATA device |
| 198 | */ |
| 199 | |
| 200 | static void pacpi_set_dmamode(struct ata_port *ap, struct ata_device *adev) |
| 201 | { |
| 202 | int unit = adev->devno; |
| 203 | struct pata_acpi *acpi = ap->private_data; |
| 204 | |
| 205 | if(!(acpi->gtm.flags & 0x10)) |
| 206 | unit = 0; |
| 207 | |
| 208 | /* Now stuff the nS values into the structure */ |
| 209 | if (adev->dma_mode >= XFER_UDMA_0) { |
| 210 | acpi->gtm.drive[unit].dma = udma_cycle[adev->dma_mode - XFER_UDMA_0]; |
| 211 | acpi->gtm.flags |= (1 << (2 * unit)); |
| 212 | } else { |
| 213 | acpi->gtm.drive[unit].dma = mwdma_cycle[adev->dma_mode - XFER_MW_DMA_0]; |
| 214 | acpi->gtm.flags &= ~(1 << (2 * unit)); |
| 215 | } |
| 216 | ata_acpi_stm(ap, &acpi->gtm); |
| 217 | /* See what mode we actually got */ |
| 218 | ata_acpi_gtm(ap, &acpi->gtm); |
| 219 | } |
| 220 | |
| 221 | /** |
| 222 | * pacpi_qc_issue_prot - command issue |
| 223 | * @qc: command pending |
| 224 | * |
| 225 | * Called when the libata layer is about to issue a command. We wrap |
| 226 | * this interface so that we can load the correct ATA timings if |
| 227 | * neccessary. |
| 228 | */ |
| 229 | |
| 230 | static unsigned int pacpi_qc_issue_prot(struct ata_queued_cmd *qc) |
| 231 | { |
| 232 | struct ata_port *ap = qc->ap; |
| 233 | struct ata_device *adev = qc->dev; |
| 234 | struct pata_acpi *acpi = ap->private_data; |
| 235 | |
| 236 | if (acpi->gtm.flags & 0x10) |
| 237 | return ata_qc_issue_prot(qc); |
| 238 | |
| 239 | if (adev != acpi->last) { |
| 240 | pacpi_set_piomode(ap, adev); |
| 241 | if (adev->dma_mode) |
| 242 | pacpi_set_dmamode(ap, adev); |
| 243 | acpi->last = adev; |
| 244 | } |
| 245 | return ata_qc_issue_prot(qc); |
| 246 | } |
| 247 | |
| 248 | /** |
| 249 | * pacpi_port_start - port setup |
| 250 | * @ap: ATA port being set up |
| 251 | * |
| 252 | * Use the port_start hook to maintain private control structures |
| 253 | */ |
| 254 | |
| 255 | static int pacpi_port_start(struct ata_port *ap) |
| 256 | { |
| 257 | struct pci_dev *pdev = to_pci_dev(ap->host->dev); |
| 258 | struct pata_acpi *acpi; |
| 259 | |
| 260 | int ret; |
| 261 | |
| 262 | if (ap->acpi_handle == NULL) |
| 263 | return -ENODEV; |
| 264 | |
| 265 | acpi = ap->private_data = devm_kzalloc(&pdev->dev, sizeof(struct pata_acpi), GFP_KERNEL); |
| 266 | if (ap->private_data == NULL) |
| 267 | return -ENOMEM; |
| 268 | acpi->mask[0] = pacpi_discover_modes(ap, &ap->link.device[0]); |
| 269 | acpi->mask[1] = pacpi_discover_modes(ap, &ap->link.device[1]); |
| 270 | ret = ata_sff_port_start(ap); |
| 271 | if (ret < 0) |
| 272 | return ret; |
| 273 | |
| 274 | return ret; |
| 275 | } |
| 276 | |
| 277 | static struct scsi_host_template pacpi_sht = { |
| 278 | .module = THIS_MODULE, |
| 279 | .name = DRV_NAME, |
| 280 | .ioctl = ata_scsi_ioctl, |
| 281 | .queuecommand = ata_scsi_queuecmd, |
| 282 | .can_queue = ATA_DEF_QUEUE, |
| 283 | .this_id = ATA_SHT_THIS_ID, |
| 284 | .sg_tablesize = LIBATA_MAX_PRD, |
| 285 | .cmd_per_lun = ATA_SHT_CMD_PER_LUN, |
| 286 | .emulated = ATA_SHT_EMULATED, |
| 287 | .use_clustering = ATA_SHT_USE_CLUSTERING, |
| 288 | .proc_name = DRV_NAME, |
| 289 | .dma_boundary = ATA_DMA_BOUNDARY, |
| 290 | .slave_configure = ata_scsi_slave_config, |
| 291 | .slave_destroy = ata_scsi_slave_destroy, |
| 292 | /* Use standard CHS mapping rules */ |
| 293 | .bios_param = ata_std_bios_param, |
| 294 | }; |
| 295 | |
| 296 | static const struct ata_port_operations pacpi_ops = { |
| 297 | .set_piomode = pacpi_set_piomode, |
| 298 | .set_dmamode = pacpi_set_dmamode, |
| 299 | .mode_filter = pacpi_mode_filter, |
| 300 | |
| 301 | /* Task file is PCI ATA format, use helpers */ |
| 302 | .tf_load = ata_tf_load, |
| 303 | .tf_read = ata_tf_read, |
| 304 | .check_status = ata_check_status, |
| 305 | .exec_command = ata_exec_command, |
| 306 | .dev_select = ata_std_dev_select, |
| 307 | |
| 308 | .freeze = ata_bmdma_freeze, |
| 309 | .thaw = ata_bmdma_thaw, |
| 310 | .error_handler = pacpi_error_handler, |
| 311 | .post_internal_cmd = ata_bmdma_post_internal_cmd, |
| 312 | .cable_detect = pacpi_cable_detect, |
| 313 | |
| 314 | /* BMDMA handling is PCI ATA format, use helpers */ |
| 315 | .bmdma_setup = ata_bmdma_setup, |
| 316 | .bmdma_start = ata_bmdma_start, |
| 317 | .bmdma_stop = ata_bmdma_stop, |
| 318 | .bmdma_status = ata_bmdma_status, |
| 319 | .qc_prep = ata_qc_prep, |
| 320 | .qc_issue = pacpi_qc_issue_prot, |
| 321 | .data_xfer = ata_data_xfer, |
| 322 | |
| 323 | /* Timeout handling */ |
| 324 | .irq_handler = ata_interrupt, |
| 325 | .irq_clear = ata_bmdma_irq_clear, |
| 326 | .irq_on = ata_irq_on, |
| 327 | |
| 328 | /* Generic PATA PCI ATA helpers */ |
| 329 | .port_start = pacpi_port_start, |
| 330 | }; |
| 331 | |
| 332 | |
| 333 | /** |
| 334 | * pacpi_init_one - Register ACPI ATA PCI device with kernel services |
| 335 | * @pdev: PCI device to register |
| 336 | * @ent: Entry in pacpi_pci_tbl matching with @pdev |
| 337 | * |
| 338 | * Called from kernel PCI layer. |
| 339 | * |
| 340 | * LOCKING: |
| 341 | * Inherited from PCI layer (may sleep). |
| 342 | * |
| 343 | * RETURNS: |
| 344 | * Zero on success, or -ERRNO value. |
| 345 | */ |
| 346 | |
| 347 | static int pacpi_init_one (struct pci_dev *pdev, const struct pci_device_id *id) |
| 348 | { |
| 349 | static const struct ata_port_info info = { |
| 350 | .sht = &pacpi_sht, |
| 351 | .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST, |
| 352 | |
| 353 | .pio_mask = 0x1f, |
| 354 | .mwdma_mask = 0x07, |
| 355 | .udma_mask = 0x7f, |
| 356 | |
| 357 | .port_ops = &pacpi_ops, |
| 358 | }; |
| 359 | const struct ata_port_info *ppi[] = { &info, NULL }; |
| 360 | return ata_pci_init_one(pdev, ppi); |
| 361 | } |
| 362 | |
| 363 | static const struct pci_device_id pacpi_pci_tbl[] = { |
| 364 | { PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_STORAGE_IDE << 8, 0xFFFFFF00UL, 1}, |
| 365 | { } /* terminate list */ |
| 366 | }; |
| 367 | |
| 368 | static struct pci_driver pacpi_pci_driver = { |
| 369 | .name = DRV_NAME, |
| 370 | .id_table = pacpi_pci_tbl, |
| 371 | .probe = pacpi_init_one, |
| 372 | .remove = ata_pci_remove_one, |
| 373 | .suspend = ata_pci_device_suspend, |
| 374 | .resume = ata_pci_device_resume, |
| 375 | }; |
| 376 | |
| 377 | static int __init pacpi_init(void) |
| 378 | { |
| 379 | return pci_register_driver(&pacpi_pci_driver); |
| 380 | } |
| 381 | |
| 382 | static void __exit pacpi_exit(void) |
| 383 | { |
| 384 | pci_unregister_driver(&pacpi_pci_driver); |
| 385 | } |
| 386 | |
| 387 | module_init(pacpi_init); |
| 388 | module_exit(pacpi_exit); |
| 389 | |
| 390 | MODULE_AUTHOR("Alan Cox"); |
| 391 | MODULE_DESCRIPTION("SCSI low-level driver for ATA in ACPI mode"); |
| 392 | MODULE_LICENSE("GPL"); |
| 393 | MODULE_DEVICE_TABLE(pci, pacpi_pci_tbl); |
| 394 | MODULE_VERSION(DRV_VERSION); |
| 395 | |