Version:  2.0.40 2.2.26 2.4.37 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2

Linux/drivers/ide/ide.c

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

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us