drivers/ide/ide.c

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This source file includes following definitions.
ide_device_get
ide_device_put
ide_bus_match
ide_uevent
generic_ide_probe
generic_ide_remove
generic_ide_shutdown
ide_set_dev_param_mask
ide_set_disk_chs
ide_dev_apply_params
ide_set_ignore_cable
ide_port_apply_params
ide_init
ide_exit
   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  Copyright (C) 1994-1998         Linus Torvalds & authors (see below)
   4  *  Copyright (C) 2003-2005, 2007   Bartlomiej Zolnierkiewicz
   5  */
   6 
   7 /*
   8  *  Mostly written by Mark Lord  <mlord@pobox.com>
   9  *                and Gadi Oxman <gadio@netvision.net.il>
  10  *                and Andre Hedrick <andre@linux-ide.org>
  11  *
  12  *  See linux/MAINTAINERS for address of current maintainer.
  13  *
  14  * This is the multiple IDE interface driver, as evolved from hd.c.
  15  * It supports up to MAX_HWIFS IDE interfaces, on one or more IRQs
  16  *   (usually 14 & 15).
  17  * There can be up to two drives per interface, as per the ATA-2 spec.
  18  *
  19  * ...
  20  *
  21  *  From hd.c:
  22  *  |
  23  *  | It traverses the request-list, using interrupts to jump between functions.
  24  *  | As nearly all functions can be called within interrupts, we may not sleep.
  25  *  | Special care is recommended.  Have Fun!
  26  *  |
  27  *  | modified by Drew Eckhardt to check nr of hd's from the CMOS.
  28  *  |
  29  *  | Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug
  30  *  | in the early extended-partition checks and added DM partitions.
  31  *  |
  32  *  | Early work on error handling by Mika Liljeberg (liljeber@cs.Helsinki.FI).
  33  *  |
  34  *  | IRQ-unmask, drive-id, multiple-mode, support for ">16 heads",
  35  *  | and general streamlining by Mark Lord (mlord@pobox.com).
  36  *
  37  *  October, 1994 -- Complete line-by-line overhaul for linux 1.1.x, by:
  38  *
  39  *      Mark Lord       (mlord@pobox.com)               (IDE Perf.Pkg)
  40  *      Delman Lee      (delman@ieee.org)               ("Mr. atdisk2")
  41  *      Scott Snyder    (snyder@fnald0.fnal.gov)        (ATAPI IDE cd-rom)
  42  *
  43  *  This was a rewrite of just about everything from hd.c, though some original
  44  *  code is still sprinkled about.  Think of it as a major evolution, with
  45  *  inspiration from lots of linux users, esp.  hamish@zot.apana.org.au
  46  */
  47 
  48 #include <linux/module.h>
  49 #include <linux/types.h>
  50 #include <linux/string.h>
  51 #include <linux/kernel.h>
  52 #include <linux/interrupt.h>
  53 #include <linux/major.h>
  54 #include <linux/errno.h>
  55 #include <linux/genhd.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 
  63 struct class *ide_port_class;
  64 
  65 /**
  66  * ide_device_get       -       get an additional reference to a ide_drive_t
  67  * @drive:      device to get a reference to
  68  *
  69  * Gets a reference to the ide_drive_t and increments the use count of the
  70  * underlying LLDD module.
  71  */
  72 int ide_device_get(ide_drive_t *drive)
  73 {
  74         struct device *host_dev;
  75         struct module *module;
  76 
  77         if (!get_device(&drive->gendev))
  78                 return -ENXIO;
  79 
  80         host_dev = drive->hwif->host->dev[0];
  81         module = host_dev ? host_dev->driver->owner : NULL;
  82 
  83         if (module && !try_module_get(module)) {
  84                 put_device(&drive->gendev);
  85                 return -ENXIO;
  86         }
  87 
  88         return 0;
  89 }
  90 EXPORT_SYMBOL_GPL(ide_device_get);
  91 
  92 /**
  93  * ide_device_put       -       release a reference to a ide_drive_t
  94  * @drive:      device to release a reference on
  95  *
  96  * Release a reference to the ide_drive_t and decrements the use count of
  97  * the underlying LLDD module.
  98  */
  99 void ide_device_put(ide_drive_t *drive)
 100 {
 101 #ifdef CONFIG_MODULE_UNLOAD
 102         struct device *host_dev = drive->hwif->host->dev[0];
 103         struct module *module = host_dev ? host_dev->driver->owner : NULL;
 104 
 105         module_put(module);
 106 #endif
 107         put_device(&drive->gendev);
 108 }
 109 EXPORT_SYMBOL_GPL(ide_device_put);
 110 
 111 static int ide_bus_match(struct device *dev, struct device_driver *drv)
 112 {
 113         return 1;
 114 }
 115 
 116 static 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 
 126 static 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 
 134 static 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 
 145 static 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 
 154 struct 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_groups     = ide_dev_groups,
 162         .suspend        = generic_ide_suspend,
 163         .resume         = generic_ide_resume,
 164 };
 165 
 166 EXPORT_SYMBOL_GPL(ide_bus_type);
 167 
 168 int ide_vlb_clk;
 169 EXPORT_SYMBOL_GPL(ide_vlb_clk);
 170 
 171 module_param_named(vlb_clock, ide_vlb_clk, int, 0);
 172 MODULE_PARM_DESC(vlb_clock, "VLB clock frequency (in MHz)");
 173 
 174 int ide_pci_clk;
 175 EXPORT_SYMBOL_GPL(ide_pci_clk);
 176 
 177 module_param_named(pci_clock, ide_pci_clk, int, 0);
 178 MODULE_PARM_DESC(pci_clock, "PCI bus clock frequency (in MHz)");
 179 
 180 static int ide_set_dev_param_mask(const char *s, const struct kernel_param *kp)
 181 {
 182         unsigned 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, "%u.%u:%u", &a, &b, &j) != 3 &&
 187             sscanf(s, "%u.%u", &a, &b) != 2)
 188                 return -EINVAL;
 189 
 190         i = a * MAX_DRIVES + b;
 191 
 192         if (i >= MAX_HWIFS * MAX_DRIVES || 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 
 203 static const 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 
 209 static unsigned int ide_nodma;
 210 
 211 module_param_named(nodma, ide_nodma, ide_dev_mask, 0);
 212 MODULE_PARM_DESC(nodma, "disallow DMA for a device");
 213 
 214 static unsigned int ide_noflush;
 215 
 216 module_param_named(noflush, ide_noflush, ide_dev_mask, 0);
 217 MODULE_PARM_DESC(noflush, "disable flush requests for a device");
 218 
 219 static unsigned int ide_nohpa;
 220 
 221 module_param_named(nohpa, ide_nohpa, ide_dev_mask, 0);
 222 MODULE_PARM_DESC(nohpa, "disable Host Protected Area for a device");
 223 
 224 static unsigned int ide_noprobe;
 225 
 226 module_param_named(noprobe, ide_noprobe, ide_dev_mask, 0);
 227 MODULE_PARM_DESC(noprobe, "skip probing for a device");
 228 
 229 static unsigned int ide_nowerr;
 230 
 231 module_param_named(nowerr, ide_nowerr, ide_dev_mask, 0);
 232 MODULE_PARM_DESC(nowerr, "ignore the ATA_DF bit for a device");
 233 
 234 static unsigned int ide_cdroms;
 235 
 236 module_param_named(cdrom, ide_cdroms, ide_dev_mask, 0);
 237 MODULE_PARM_DESC(cdrom, "force device as a CD-ROM");
 238 
 239 struct chs_geom {
 240         unsigned int    cyl;
 241         u8              head;
 242         u8              sect;
 243 };
 244 
 245 static unsigned int ide_disks;
 246 static struct chs_geom ide_disks_chs[MAX_HWIFS * MAX_DRIVES];
 247 
 248 static int ide_set_disk_chs(const char *str, const struct kernel_param *kp)
 249 {
 250         unsigned 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, "%u.%u:%u,%u,%u", &a, &b, &c, &h, &s) != 5 &&
 255             sscanf(str, "%u.%u:%u", &a, &b, &j) != 3)
 256                 return -EINVAL;
 257 
 258         i = a * MAX_DRIVES + b;
 259 
 260         if (i >= MAX_HWIFS * MAX_DRIVES || 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 
 278 module_param_call(chs, ide_set_disk_chs, NULL, NULL, 0);
 279 MODULE_PARM_DESC(chs, "force device as a disk (using CHS)");
 280 
 281 static 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 
 330 static unsigned int ide_ignore_cable;
 331 
 332 static int ide_set_ignore_cable(const char *s, const 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 
 352 module_param_call(ignore_cable, ide_set_ignore_cable, NULL, NULL, 0);
 353 MODULE_PARM_DESC(ignore_cable, "ignore cable detection");
 354 
 355 void 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  */
 373 static 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 
 397 out_port_class:
 398         bus_unregister(&ide_bus_type);
 399 
 400         return ret;
 401 }
 402 
 403 static 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 
 412 module_init(ide_init);
 413 module_exit(ide_exit);
 414 
 415 MODULE_LICENSE("GPL");
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/ide/ide.c

DEFINITIONS
