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/init.h> 56#include <linux/pci.h> 57#include <linux/ide.h> 58#include <linux/hdreg.h> 59#include <linux/completion.h> 60#include <linux/device.h> 61 62struct class *ide_port_class; 63 64/** 65 * ide_device_get - get an additional reference to a ide_drive_t 66 * @drive: device to get a reference to 67 * 68 * Gets a reference to the ide_drive_t and increments the use count of the 69 * underlying LLDD module. 70 */ 71int ide_device_get(ide_drive_t *drive) 72{ 73 struct device *host_dev; 74 struct module *module; 75 76 if (!get_device(&drive->gendev)) 77 return -ENXIO; 78 79 host_dev = drive->hwif->host->dev[0]; 80 module = host_dev ? host_dev->driver->owner : NULL; 81 82 if (module && !try_module_get(module)) { 83 put_device(&drive->gendev); 84 return -ENXIO; 85 } 86 87 return 0; 88} 89EXPORT_SYMBOL_GPL(ide_device_get); 90 91/** 92 * ide_device_put - release a reference to a ide_drive_t 93 * @drive: device to release a reference on 94 * 95 * Release a reference to the ide_drive_t and decrements the use count of 96 * the underlying LLDD module. 97 */ 98void ide_device_put(ide_drive_t *drive) 99{ 100#ifdef CONFIG_MODULE_UNLOAD 101 struct device *host_dev = drive->hwif->host->dev[0]; 102 struct module *module = host_dev ? host_dev->driver->owner : NULL; 103 104 if (module) 105 module_put(module); 106#endif 107 put_device(&drive->gendev); 108} 109EXPORT_SYMBOL_GPL(ide_device_put); 110 111static int ide_bus_match(struct device *dev, struct device_driver *drv) 112{ 113 return 1; 114} 115 116static int ide_uevent(struct device *dev, struct kobj_uevent_env *env) 117{ 118 ide_drive_t *drive = to_ide_device(dev); 119 120 add_uevent_var(env, "MEDIA=%s", ide_media_string(drive)); 121 add_uevent_var(env, "DRIVENAME=%s", drive->name); 122 add_uevent_var(env, "MODALIAS=ide:m-%s", ide_media_string(drive)); 123 return 0; 124} 125 126static int generic_ide_probe(struct device *dev) 127{ 128 ide_drive_t *drive = to_ide_device(dev); 129 struct ide_driver *drv = to_ide_driver(dev->driver); 130 131 return drv->probe ? drv->probe(drive) : -ENODEV; 132} 133 134static int generic_ide_remove(struct device *dev) 135{ 136 ide_drive_t *drive = to_ide_device(dev); 137 struct ide_driver *drv = to_ide_driver(dev->driver); 138 139 if (drv->remove) 140 drv->remove(drive); 141 142 return 0; 143} 144 145static void generic_ide_shutdown(struct device *dev) 146{ 147 ide_drive_t *drive = to_ide_device(dev); 148 struct ide_driver *drv = to_ide_driver(dev->driver); 149 150 if (dev->driver && drv->shutdown) 151 drv->shutdown(drive); 152} 153 154struct bus_type ide_bus_type = { 155 .name = "ide", 156 .match = ide_bus_match, 157 .uevent = ide_uevent, 158 .probe = generic_ide_probe, 159 .remove = generic_ide_remove, 160 .shutdown = generic_ide_shutdown, 161 .dev_attrs = ide_dev_attrs, 162 .suspend = generic_ide_suspend, 163 .resume = generic_ide_resume, 164}; 165 166EXPORT_SYMBOL_GPL(ide_bus_type); 167 168int ide_vlb_clk; 169EXPORT_SYMBOL_GPL(ide_vlb_clk); 170 171module_param_named(vlb_clock, ide_vlb_clk, int, 0); 172MODULE_PARM_DESC(vlb_clock, "VLB clock frequency (in MHz)"); 173 174int ide_pci_clk; 175EXPORT_SYMBOL_GPL(ide_pci_clk); 176 177module_param_named(pci_clock, ide_pci_clk, int, 0); 178MODULE_PARM_DESC(pci_clock, "PCI bus clock frequency (in MHz)"); 179 180static int ide_set_dev_param_mask(const char *s, const struct kernel_param *kp) 181{ 182 int a, b, i, j = 1; 183 unsigned int *dev_param_mask = (unsigned int *)kp->arg; 184 185 /* controller . device (0 or 1) [ : 1 (set) | 0 (clear) ] */ 186 if (sscanf(s, "%d.%d:%d", &a, &b, &j) != 3 && 187 sscanf(s, "%d.%d", &a, &b) != 2) 188 return -EINVAL; 189 190 i = a * MAX_DRIVES + b; 191 192 if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1) 193 return -EINVAL; 194 195 if (j) 196 *dev_param_mask |= (1 << i); 197 else 198 *dev_param_mask &= ~(1 << i); 199 200 return 0; 201} 202 203static struct kernel_param_ops param_ops_ide_dev_mask = { 204 .set = ide_set_dev_param_mask 205}; 206 207#define param_check_ide_dev_mask(name, p) param_check_uint(name, p) 208 209static unsigned int ide_nodma; 210 211module_param_named(nodma, ide_nodma, ide_dev_mask, 0); 212MODULE_PARM_DESC(nodma, "disallow DMA for a device"); 213 214static unsigned int ide_noflush; 215 216module_param_named(noflush, ide_noflush, ide_dev_mask, 0); 217MODULE_PARM_DESC(noflush, "disable flush requests for a device"); 218 219static unsigned int ide_nohpa; 220 221module_param_named(nohpa, ide_nohpa, ide_dev_mask, 0); 222MODULE_PARM_DESC(nohpa, "disable Host Protected Area for a device"); 223 224static unsigned int ide_noprobe; 225 226module_param_named(noprobe, ide_noprobe, ide_dev_mask, 0); 227MODULE_PARM_DESC(noprobe, "skip probing for a device"); 228 229static unsigned int ide_nowerr; 230 231module_param_named(nowerr, ide_nowerr, ide_dev_mask, 0); 232MODULE_PARM_DESC(nowerr, "ignore the ATA_DF bit for a device"); 233 234static unsigned int ide_cdroms; 235 236module_param_named(cdrom, ide_cdroms, ide_dev_mask, 0); 237MODULE_PARM_DESC(cdrom, "force device as a CD-ROM"); 238 239struct chs_geom { 240 unsigned int cyl; 241 u8 head; 242 u8 sect; 243}; 244 245static unsigned int ide_disks; 246static struct chs_geom ide_disks_chs[MAX_HWIFS * MAX_DRIVES]; 247 248static int ide_set_disk_chs(const char *str, struct kernel_param *kp) 249{ 250 int a, b, c = 0, h = 0, s = 0, i, j = 1; 251 252 /* controller . device (0 or 1) : Cylinders , Heads , Sectors */ 253 /* controller . device (0 or 1) : 1 (use CHS) | 0 (ignore CHS) */ 254 if (sscanf(str, "%d.%d:%d,%d,%d", &a, &b, &c, &h, &s) != 5 && 255 sscanf(str, "%d.%d:%d", &a, &b, &j) != 3) 256 return -EINVAL; 257 258 i = a * MAX_DRIVES + b; 259 260 if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1) 261 return -EINVAL; 262 263 if (c > INT_MAX || h > 255 || s > 255) 264 return -EINVAL; 265 266 if (j) 267 ide_disks |= (1 << i); 268 else 269 ide_disks &= ~(1 << i); 270 271 ide_disks_chs[i].cyl = c; 272 ide_disks_chs[i].head = h; 273 ide_disks_chs[i].sect = s; 274 275 return 0; 276} 277 278module_param_call(chs, ide_set_disk_chs, NULL, NULL, 0); 279MODULE_PARM_DESC(chs, "force device as a disk (using CHS)"); 280 281static void ide_dev_apply_params(ide_drive_t *drive, u8 unit) 282{ 283 int i = drive->hwif->index * MAX_DRIVES + unit; 284 285 if (ide_nodma & (1 << i)) { 286 printk(KERN_INFO "ide: disallowing DMA for %s\n", drive->name); 287 drive->dev_flags |= IDE_DFLAG_NODMA; 288 } 289 if (ide_noflush & (1 << i)) { 290 printk(KERN_INFO "ide: disabling flush requests for %s\n", 291 drive->name); 292 drive->dev_flags |= IDE_DFLAG_NOFLUSH; 293 } 294 if (ide_nohpa & (1 << i)) { 295 printk(KERN_INFO "ide: disabling Host Protected Area for %s\n", 296 drive->name); 297 drive->dev_flags |= IDE_DFLAG_NOHPA; 298 } 299 if (ide_noprobe & (1 << i)) { 300 printk(KERN_INFO "ide: skipping probe for %s\n", drive->name); 301 drive->dev_flags |= IDE_DFLAG_NOPROBE; 302 } 303 if (ide_nowerr & (1 << i)) { 304 printk(KERN_INFO "ide: ignoring the ATA_DF bit for %s\n", 305 drive->name); 306 drive->bad_wstat = BAD_R_STAT; 307 } 308 if (ide_cdroms & (1 << i)) { 309 printk(KERN_INFO "ide: forcing %s as a CD-ROM\n", drive->name); 310 drive->dev_flags |= IDE_DFLAG_PRESENT; 311 drive->media = ide_cdrom; 312 /* an ATAPI device ignores DRDY */ 313 drive->ready_stat = 0; 314 } 315 if (ide_disks & (1 << i)) { 316 drive->cyl = drive->bios_cyl = ide_disks_chs[i].cyl; 317 drive->head = drive->bios_head = ide_disks_chs[i].head; 318 drive->sect = drive->bios_sect = ide_disks_chs[i].sect; 319 320 printk(KERN_INFO "ide: forcing %s as a disk (%d/%d/%d)\n", 321 drive->name, 322 drive->cyl, drive->head, drive->sect); 323 324 drive->dev_flags |= IDE_DFLAG_FORCED_GEOM | IDE_DFLAG_PRESENT; 325 drive->media = ide_disk; 326 drive->ready_stat = ATA_DRDY; 327 } 328} 329 330static unsigned int ide_ignore_cable; 331 332static int ide_set_ignore_cable(const char *s, struct kernel_param *kp) 333{ 334 int i, j = 1; 335 336 /* controller (ignore) */ 337 /* controller : 1 (ignore) | 0 (use) */ 338 if (sscanf(s, "%d:%d", &i, &j) != 2 && sscanf(s, "%d", &i) != 1) 339 return -EINVAL; 340 341 if (i >= MAX_HWIFS || j < 0 || j > 1) 342 return -EINVAL; 343 344 if (j) 345 ide_ignore_cable |= (1 << i); 346 else 347 ide_ignore_cable &= ~(1 << i); 348 349 return 0; 350} 351 352module_param_call(ignore_cable, ide_set_ignore_cable, NULL, NULL, 0); 353MODULE_PARM_DESC(ignore_cable, "ignore cable detection"); 354 355void ide_port_apply_params(ide_hwif_t *hwif) 356{ 357 ide_drive_t *drive; 358 int i; 359 360 if (ide_ignore_cable & (1 << hwif->index)) { 361 printk(KERN_INFO "ide: ignoring cable detection for %s\n", 362 hwif->name); 363 hwif->cbl = ATA_CBL_PATA40_SHORT; 364 } 365 366 ide_port_for_each_dev(i, drive, hwif) 367 ide_dev_apply_params(drive, i); 368} 369 370/* 371 * This is gets invoked once during initialization, to set *everything* up 372 */ 373static int __init ide_init(void) 374{ 375 int ret; 376 377 printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n"); 378 379 ret = bus_register(&ide_bus_type); 380 if (ret < 0) { 381 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret); 382 return ret; 383 } 384 385 ide_port_class = class_create(THIS_MODULE, "ide_port"); 386 if (IS_ERR(ide_port_class)) { 387 ret = PTR_ERR(ide_port_class); 388 goto out_port_class; 389 } 390 391 ide_acpi_init(); 392 393 proc_ide_create(); 394 395 return 0; 396 397out_port_class: 398 bus_unregister(&ide_bus_type); 399 400 return ret; 401} 402 403static void __exit ide_exit(void) 404{ 405 proc_ide_destroy(); 406 407 class_destroy(ide_port_class); 408 409 bus_unregister(&ide_bus_type); 410} 411 412module_init(ide_init); 413module_exit(ide_exit); 414 415MODULE_LICENSE("GPL"); 416