ide.c revision 5e7f3a46690f7f6c9f2781c700ab4370874aa0e8
1/* 2 * Copyright (C) 1994-1998 Linus Torvalds & authors (see below) 3 * Copyright (C) 2003-2005, 2007 Bartlomiej Zolnierkiewicz 4 */ 5 6/* 7 * Mostly written by Mark Lord <mlord@pobox.com> 8 * and Gadi Oxman <gadio@netvision.net.il> 9 * and Andre Hedrick <andre@linux-ide.org> 10 * 11 * See linux/MAINTAINERS for address of current maintainer. 12 * 13 * This is the multiple IDE interface driver, as evolved from hd.c. 14 * It supports up to MAX_HWIFS IDE interfaces, on one or more IRQs 15 * (usually 14 & 15). 16 * There can be up to two drives per interface, as per the ATA-2 spec. 17 * 18 * ... 19 * 20 * From hd.c: 21 * | 22 * | It traverses the request-list, using interrupts to jump between functions. 23 * | As nearly all functions can be called within interrupts, we may not sleep. 24 * | Special care is recommended. Have Fun! 25 * | 26 * | modified by Drew Eckhardt to check nr of hd's from the CMOS. 27 * | 28 * | Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug 29 * | in the early extended-partition checks and added DM partitions. 30 * | 31 * | Early work on error handling by Mika Liljeberg (liljeber@cs.Helsinki.FI). 32 * | 33 * | IRQ-unmask, drive-id, multiple-mode, support for ">16 heads", 34 * | and general streamlining by Mark Lord (mlord@pobox.com). 35 * 36 * October, 1994 -- Complete line-by-line overhaul for linux 1.1.x, by: 37 * 38 * Mark Lord (mlord@pobox.com) (IDE Perf.Pkg) 39 * Delman Lee (delman@ieee.org) ("Mr. atdisk2") 40 * Scott Snyder (snyder@fnald0.fnal.gov) (ATAPI IDE cd-rom) 41 * 42 * This was a rewrite of just about everything from hd.c, though some original 43 * code is still sprinkled about. Think of it as a major evolution, with 44 * inspiration from lots of linux users, esp. hamish@zot.apana.org.au 45 */ 46 47#include <linux/module.h> 48#include <linux/types.h> 49#include <linux/string.h> 50#include <linux/kernel.h> 51#include <linux/interrupt.h> 52#include <linux/major.h> 53#include <linux/errno.h> 54#include <linux/genhd.h> 55#include <linux/slab.h> 56#include <linux/init.h> 57#include <linux/pci.h> 58#include <linux/ide.h> 59#include <linux/hdreg.h> 60#include <linux/completion.h> 61#include <linux/device.h> 62 63struct class *ide_port_class; 64 65/* 66 * Locks for IDE setting functionality 67 */ 68 69DEFINE_MUTEX(ide_setting_mtx); 70 71ide_devset_get(io_32bit, io_32bit); 72 73static int set_io_32bit(ide_drive_t *drive, int arg) 74{ 75 if (drive->dev_flags & IDE_DFLAG_NO_IO_32BIT) 76 return -EPERM; 77 78 if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1)) 79 return -EINVAL; 80 81 drive->io_32bit = arg; 82 83 return 0; 84} 85 86ide_devset_get_flag(ksettings, IDE_DFLAG_KEEP_SETTINGS); 87 88static int set_ksettings(ide_drive_t *drive, int arg) 89{ 90 if (arg < 0 || arg > 1) 91 return -EINVAL; 92 93 if (arg) 94 drive->dev_flags |= IDE_DFLAG_KEEP_SETTINGS; 95 else 96 drive->dev_flags &= ~IDE_DFLAG_KEEP_SETTINGS; 97 98 return 0; 99} 100 101ide_devset_get_flag(using_dma, IDE_DFLAG_USING_DMA); 102 103static int set_using_dma(ide_drive_t *drive, int arg) 104{ 105#ifdef CONFIG_BLK_DEV_IDEDMA 106 int err = -EPERM; 107 108 if (arg < 0 || arg > 1) 109 return -EINVAL; 110 111 if (ata_id_has_dma(drive->id) == 0) 112 goto out; 113 114 if (drive->hwif->dma_ops == NULL) 115 goto out; 116 117 err = 0; 118 119 if (arg) { 120 if (ide_set_dma(drive)) 121 err = -EIO; 122 } else 123 ide_dma_off(drive); 124 125out: 126 return err; 127#else 128 if (arg < 0 || arg > 1) 129 return -EINVAL; 130 131 return -EPERM; 132#endif 133} 134 135/* 136 * handle HDIO_SET_PIO_MODE ioctl abusers here, eventually it will go away 137 */ 138static int set_pio_mode_abuse(ide_hwif_t *hwif, u8 req_pio) 139{ 140 switch (req_pio) { 141 case 202: 142 case 201: 143 case 200: 144 case 102: 145 case 101: 146 case 100: 147 return (hwif->host_flags & IDE_HFLAG_ABUSE_DMA_MODES) ? 1 : 0; 148 case 9: 149 case 8: 150 return (hwif->host_flags & IDE_HFLAG_ABUSE_PREFETCH) ? 1 : 0; 151 case 7: 152 case 6: 153 return (hwif->host_flags & IDE_HFLAG_ABUSE_FAST_DEVSEL) ? 1 : 0; 154 default: 155 return 0; 156 } 157} 158 159static int set_pio_mode(ide_drive_t *drive, int arg) 160{ 161 ide_hwif_t *hwif = drive->hwif; 162 const struct ide_port_ops *port_ops = hwif->port_ops; 163 164 if (arg < 0 || arg > 255) 165 return -EINVAL; 166 167 if (port_ops == NULL || port_ops->set_pio_mode == NULL || 168 (hwif->host_flags & IDE_HFLAG_NO_SET_MODE)) 169 return -ENOSYS; 170 171 if (set_pio_mode_abuse(drive->hwif, arg)) { 172 if (arg == 8 || arg == 9) { 173 unsigned long flags; 174 175 /* take lock for IDE_DFLAG_[NO_]UNMASK/[NO_]IO_32BIT */ 176 spin_lock_irqsave(&hwif->lock, flags); 177 port_ops->set_pio_mode(drive, arg); 178 spin_unlock_irqrestore(&hwif->lock, flags); 179 } else 180 port_ops->set_pio_mode(drive, arg); 181 } else { 182 int keep_dma = !!(drive->dev_flags & IDE_DFLAG_USING_DMA); 183 184 ide_set_pio(drive, arg); 185 186 if (hwif->host_flags & IDE_HFLAG_SET_PIO_MODE_KEEP_DMA) { 187 if (keep_dma) 188 ide_dma_on(drive); 189 } 190 } 191 192 return 0; 193} 194 195ide_devset_get_flag(unmaskirq, IDE_DFLAG_UNMASK); 196 197static int set_unmaskirq(ide_drive_t *drive, int arg) 198{ 199 if (drive->dev_flags & IDE_DFLAG_NO_UNMASK) 200 return -EPERM; 201 202 if (arg < 0 || arg > 1) 203 return -EINVAL; 204 205 if (arg) 206 drive->dev_flags |= IDE_DFLAG_UNMASK; 207 else 208 drive->dev_flags &= ~IDE_DFLAG_UNMASK; 209 210 return 0; 211} 212 213ide_ext_devset_rw_sync(io_32bit, io_32bit); 214ide_ext_devset_rw_sync(keepsettings, ksettings); 215ide_ext_devset_rw_sync(unmaskirq, unmaskirq); 216ide_ext_devset_rw_sync(using_dma, using_dma); 217__IDE_DEVSET(pio_mode, DS_SYNC, NULL, set_pio_mode); 218 219/** 220 * ide_device_get - get an additional reference to a ide_drive_t 221 * @drive: device to get a reference to 222 * 223 * Gets a reference to the ide_drive_t and increments the use count of the 224 * underlying LLDD module. 225 */ 226int ide_device_get(ide_drive_t *drive) 227{ 228 struct device *host_dev; 229 struct module *module; 230 231 if (!get_device(&drive->gendev)) 232 return -ENXIO; 233 234 host_dev = drive->hwif->host->dev[0]; 235 module = host_dev ? host_dev->driver->owner : NULL; 236 237 if (module && !try_module_get(module)) { 238 put_device(&drive->gendev); 239 return -ENXIO; 240 } 241 242 return 0; 243} 244EXPORT_SYMBOL_GPL(ide_device_get); 245 246/** 247 * ide_device_put - release a reference to a ide_drive_t 248 * @drive: device to release a reference on 249 * 250 * Release a reference to the ide_drive_t and decrements the use count of 251 * the underlying LLDD module. 252 */ 253void ide_device_put(ide_drive_t *drive) 254{ 255#ifdef CONFIG_MODULE_UNLOAD 256 struct device *host_dev = drive->hwif->host->dev[0]; 257 struct module *module = host_dev ? host_dev->driver->owner : NULL; 258 259 if (module) 260 module_put(module); 261#endif 262 put_device(&drive->gendev); 263} 264EXPORT_SYMBOL_GPL(ide_device_put); 265 266static int ide_bus_match(struct device *dev, struct device_driver *drv) 267{ 268 return 1; 269} 270 271static int ide_uevent(struct device *dev, struct kobj_uevent_env *env) 272{ 273 ide_drive_t *drive = to_ide_device(dev); 274 275 add_uevent_var(env, "MEDIA=%s", ide_media_string(drive)); 276 add_uevent_var(env, "DRIVENAME=%s", drive->name); 277 add_uevent_var(env, "MODALIAS=ide:m-%s", ide_media_string(drive)); 278 return 0; 279} 280 281static int generic_ide_probe(struct device *dev) 282{ 283 ide_drive_t *drive = to_ide_device(dev); 284 struct ide_driver *drv = to_ide_driver(dev->driver); 285 286 return drv->probe ? drv->probe(drive) : -ENODEV; 287} 288 289static int generic_ide_remove(struct device *dev) 290{ 291 ide_drive_t *drive = to_ide_device(dev); 292 struct ide_driver *drv = to_ide_driver(dev->driver); 293 294 if (drv->remove) 295 drv->remove(drive); 296 297 return 0; 298} 299 300static void generic_ide_shutdown(struct device *dev) 301{ 302 ide_drive_t *drive = to_ide_device(dev); 303 struct ide_driver *drv = to_ide_driver(dev->driver); 304 305 if (dev->driver && drv->shutdown) 306 drv->shutdown(drive); 307} 308 309struct bus_type ide_bus_type = { 310 .name = "ide", 311 .match = ide_bus_match, 312 .uevent = ide_uevent, 313 .probe = generic_ide_probe, 314 .remove = generic_ide_remove, 315 .shutdown = generic_ide_shutdown, 316 .dev_attrs = ide_dev_attrs, 317 .suspend = generic_ide_suspend, 318 .resume = generic_ide_resume, 319}; 320 321EXPORT_SYMBOL_GPL(ide_bus_type); 322 323int ide_vlb_clk; 324EXPORT_SYMBOL_GPL(ide_vlb_clk); 325 326module_param_named(vlb_clock, ide_vlb_clk, int, 0); 327MODULE_PARM_DESC(vlb_clock, "VLB clock frequency (in MHz)"); 328 329int ide_pci_clk; 330EXPORT_SYMBOL_GPL(ide_pci_clk); 331 332module_param_named(pci_clock, ide_pci_clk, int, 0); 333MODULE_PARM_DESC(pci_clock, "PCI bus clock frequency (in MHz)"); 334 335static int ide_set_dev_param_mask(const char *s, struct kernel_param *kp) 336{ 337 int a, b, i, j = 1; 338 unsigned int *dev_param_mask = (unsigned int *)kp->arg; 339 340 if (sscanf(s, "%d.%d:%d", &a, &b, &j) != 3 && 341 sscanf(s, "%d.%d", &a, &b) != 2) 342 return -EINVAL; 343 344 i = a * MAX_DRIVES + b; 345 346 if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1) 347 return -EINVAL; 348 349 if (j) 350 *dev_param_mask |= (1 << i); 351 else 352 *dev_param_mask &= (1 << i); 353 354 return 0; 355} 356 357static unsigned int ide_nodma; 358 359module_param_call(nodma, ide_set_dev_param_mask, NULL, &ide_nodma, 0); 360MODULE_PARM_DESC(nodma, "disallow DMA for a device"); 361 362static unsigned int ide_noflush; 363 364module_param_call(noflush, ide_set_dev_param_mask, NULL, &ide_noflush, 0); 365MODULE_PARM_DESC(noflush, "disable flush requests for a device"); 366 367static unsigned int ide_noprobe; 368 369module_param_call(noprobe, ide_set_dev_param_mask, NULL, &ide_noprobe, 0); 370MODULE_PARM_DESC(noprobe, "skip probing for a device"); 371 372static unsigned int ide_nowerr; 373 374module_param_call(nowerr, ide_set_dev_param_mask, NULL, &ide_nowerr, 0); 375MODULE_PARM_DESC(nowerr, "ignore the ATA_DF bit for a device"); 376 377static unsigned int ide_cdroms; 378 379module_param_call(cdrom, ide_set_dev_param_mask, NULL, &ide_cdroms, 0); 380MODULE_PARM_DESC(cdrom, "force device as a CD-ROM"); 381 382struct chs_geom { 383 unsigned int cyl; 384 u8 head; 385 u8 sect; 386}; 387 388static unsigned int ide_disks; 389static struct chs_geom ide_disks_chs[MAX_HWIFS * MAX_DRIVES]; 390 391static int ide_set_disk_chs(const char *str, struct kernel_param *kp) 392{ 393 int a, b, c = 0, h = 0, s = 0, i, j = 1; 394 395 if (sscanf(str, "%d.%d:%d,%d,%d", &a, &b, &c, &h, &s) != 5 && 396 sscanf(str, "%d.%d:%d", &a, &b, &j) != 3) 397 return -EINVAL; 398 399 i = a * MAX_DRIVES + b; 400 401 if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1) 402 return -EINVAL; 403 404 if (c > INT_MAX || h > 255 || s > 255) 405 return -EINVAL; 406 407 if (j) 408 ide_disks |= (1 << i); 409 else 410 ide_disks &= (1 << i); 411 412 ide_disks_chs[i].cyl = c; 413 ide_disks_chs[i].head = h; 414 ide_disks_chs[i].sect = s; 415 416 return 0; 417} 418 419module_param_call(chs, ide_set_disk_chs, NULL, NULL, 0); 420MODULE_PARM_DESC(chs, "force device as a disk (using CHS)"); 421 422static void ide_dev_apply_params(ide_drive_t *drive, u8 unit) 423{ 424 int i = drive->hwif->index * MAX_DRIVES + unit; 425 426 if (ide_nodma & (1 << i)) { 427 printk(KERN_INFO "ide: disallowing DMA for %s\n", drive->name); 428 drive->dev_flags |= IDE_DFLAG_NODMA; 429 } 430 if (ide_noflush & (1 << i)) { 431 printk(KERN_INFO "ide: disabling flush requests for %s\n", 432 drive->name); 433 drive->dev_flags |= IDE_DFLAG_NOFLUSH; 434 } 435 if (ide_noprobe & (1 << i)) { 436 printk(KERN_INFO "ide: skipping probe for %s\n", drive->name); 437 drive->dev_flags |= IDE_DFLAG_NOPROBE; 438 } 439 if (ide_nowerr & (1 << i)) { 440 printk(KERN_INFO "ide: ignoring the ATA_DF bit for %s\n", 441 drive->name); 442 drive->bad_wstat = BAD_R_STAT; 443 } 444 if (ide_cdroms & (1 << i)) { 445 printk(KERN_INFO "ide: forcing %s as a CD-ROM\n", drive->name); 446 drive->dev_flags |= IDE_DFLAG_PRESENT; 447 drive->media = ide_cdrom; 448 /* an ATAPI device ignores DRDY */ 449 drive->ready_stat = 0; 450 } 451 if (ide_disks & (1 << i)) { 452 drive->cyl = drive->bios_cyl = ide_disks_chs[i].cyl; 453 drive->head = drive->bios_head = ide_disks_chs[i].head; 454 drive->sect = drive->bios_sect = ide_disks_chs[i].sect; 455 456 printk(KERN_INFO "ide: forcing %s as a disk (%d/%d/%d)\n", 457 drive->name, 458 drive->cyl, drive->head, drive->sect); 459 460 drive->dev_flags |= IDE_DFLAG_FORCED_GEOM | IDE_DFLAG_PRESENT; 461 drive->media = ide_disk; 462 drive->ready_stat = ATA_DRDY; 463 } 464} 465 466static unsigned int ide_ignore_cable; 467 468static int ide_set_ignore_cable(const char *s, struct kernel_param *kp) 469{ 470 int i, j = 1; 471 472 if (sscanf(s, "%d:%d", &i, &j) != 2 && sscanf(s, "%d", &i) != 1) 473 return -EINVAL; 474 475 if (i >= MAX_HWIFS || j < 0 || j > 1) 476 return -EINVAL; 477 478 if (j) 479 ide_ignore_cable |= (1 << i); 480 else 481 ide_ignore_cable &= (1 << i); 482 483 return 0; 484} 485 486module_param_call(ignore_cable, ide_set_ignore_cable, NULL, NULL, 0); 487MODULE_PARM_DESC(ignore_cable, "ignore cable detection"); 488 489void ide_port_apply_params(ide_hwif_t *hwif) 490{ 491 int i; 492 493 if (ide_ignore_cable & (1 << hwif->index)) { 494 printk(KERN_INFO "ide: ignoring cable detection for %s\n", 495 hwif->name); 496 hwif->cbl = ATA_CBL_PATA40_SHORT; 497 } 498 499 for (i = 0; i < MAX_DRIVES; i++) 500 ide_dev_apply_params(hwif->devices[i], i); 501} 502 503/* 504 * This is gets invoked once during initialization, to set *everything* up 505 */ 506static int __init ide_init(void) 507{ 508 int ret; 509 510 printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n"); 511 512 ret = bus_register(&ide_bus_type); 513 if (ret < 0) { 514 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret); 515 return ret; 516 } 517 518 ide_port_class = class_create(THIS_MODULE, "ide_port"); 519 if (IS_ERR(ide_port_class)) { 520 ret = PTR_ERR(ide_port_class); 521 goto out_port_class; 522 } 523 524 proc_ide_create(); 525 526 return 0; 527 528out_port_class: 529 bus_unregister(&ide_bus_type); 530 531 return ret; 532} 533 534static void __exit ide_exit(void) 535{ 536 proc_ide_destroy(); 537 538 class_destroy(ide_port_class); 539 540 bus_unregister(&ide_bus_type); 541} 542 543module_init(ide_init); 544module_exit(ide_exit); 545 546MODULE_LICENSE("GPL"); 547