pcmcia/cm4000: fix lock imbalance
[linux-2.6/mini2440.git] / drivers / ide / ide.c
blob16d056939f9f313119c5a0c51da62456d85669aa
1 /*
2 * Copyright (C) 1994-1998 Linus Torvalds & authors (see below)
3 * Copyright (C) 2003-2005, 2007 Bartlomiej Zolnierkiewicz
4 */
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>
11 * See linux/MAINTAINERS for address of current maintainer.
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.
18 * ...
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).
36 * October, 1994 -- Complete line-by-line overhaul for linux 1.1.x, by:
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)
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
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>
63 struct class *ide_port_class;
65 /**
66 * ide_device_get - get an additional reference to a ide_drive_t
67 * @drive: device to get a reference to
69 * Gets a reference to the ide_drive_t and increments the use count of the
70 * underlying LLDD module.
72 int ide_device_get(ide_drive_t *drive)
74 struct device *host_dev;
75 struct module *module;
77 if (!get_device(&drive->gendev))
78 return -ENXIO;
80 host_dev = drive->hwif->host->dev[0];
81 module = host_dev ? host_dev->driver->owner : NULL;
83 if (module && !try_module_get(module)) {
84 put_device(&drive->gendev);
85 return -ENXIO;
88 return 0;
90 EXPORT_SYMBOL_GPL(ide_device_get);
92 /**
93 * ide_device_put - release a reference to a ide_drive_t
94 * @drive: device to release a reference on
96 * Release a reference to the ide_drive_t and decrements the use count of
97 * the underlying LLDD module.
99 void ide_device_put(ide_drive_t *drive)
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;
105 if (module)
106 module_put(module);
107 #endif
108 put_device(&drive->gendev);
110 EXPORT_SYMBOL_GPL(ide_device_put);
112 static int ide_bus_match(struct device *dev, struct device_driver *drv)
114 return 1;
117 static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
119 ide_drive_t *drive = to_ide_device(dev);
121 add_uevent_var(env, "MEDIA=%s", ide_media_string(drive));
122 add_uevent_var(env, "DRIVENAME=%s", drive->name);
123 add_uevent_var(env, "MODALIAS=ide:m-%s", ide_media_string(drive));
124 return 0;
127 static int generic_ide_probe(struct device *dev)
129 ide_drive_t *drive = to_ide_device(dev);
130 struct ide_driver *drv = to_ide_driver(dev->driver);
132 return drv->probe ? drv->probe(drive) : -ENODEV;
135 static int generic_ide_remove(struct device *dev)
137 ide_drive_t *drive = to_ide_device(dev);
138 struct ide_driver *drv = to_ide_driver(dev->driver);
140 if (drv->remove)
141 drv->remove(drive);
143 return 0;
146 static void generic_ide_shutdown(struct device *dev)
148 ide_drive_t *drive = to_ide_device(dev);
149 struct ide_driver *drv = to_ide_driver(dev->driver);
151 if (dev->driver && drv->shutdown)
152 drv->shutdown(drive);
155 struct bus_type ide_bus_type = {
156 .name = "ide",
157 .match = ide_bus_match,
158 .uevent = ide_uevent,
159 .probe = generic_ide_probe,
160 .remove = generic_ide_remove,
161 .shutdown = generic_ide_shutdown,
162 .dev_attrs = ide_dev_attrs,
163 .suspend = generic_ide_suspend,
164 .resume = generic_ide_resume,
167 EXPORT_SYMBOL_GPL(ide_bus_type);
169 int ide_vlb_clk;
170 EXPORT_SYMBOL_GPL(ide_vlb_clk);
172 module_param_named(vlb_clock, ide_vlb_clk, int, 0);
173 MODULE_PARM_DESC(vlb_clock, "VLB clock frequency (in MHz)");
175 int ide_pci_clk;
176 EXPORT_SYMBOL_GPL(ide_pci_clk);
178 module_param_named(pci_clock, ide_pci_clk, int, 0);
179 MODULE_PARM_DESC(pci_clock, "PCI bus clock frequency (in MHz)");
181 static int ide_set_dev_param_mask(const char *s, struct kernel_param *kp)
183 int a, b, i, j = 1;
184 unsigned int *dev_param_mask = (unsigned int *)kp->arg;
186 /* controller . device (0 or 1) [ : 1 (set) | 0 (clear) ] */
187 if (sscanf(s, "%d.%d:%d", &a, &b, &j) != 3 &&
188 sscanf(s, "%d.%d", &a, &b) != 2)
189 return -EINVAL;
191 i = a * MAX_DRIVES + b;
193 if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
194 return -EINVAL;
196 if (j)
197 *dev_param_mask |= (1 << i);
198 else
199 *dev_param_mask &= ~(1 << i);
201 return 0;
204 static unsigned int ide_nodma;
206 module_param_call(nodma, ide_set_dev_param_mask, NULL, &ide_nodma, 0);
207 MODULE_PARM_DESC(nodma, "disallow DMA for a device");
209 static unsigned int ide_noflush;
211 module_param_call(noflush, ide_set_dev_param_mask, NULL, &ide_noflush, 0);
212 MODULE_PARM_DESC(noflush, "disable flush requests for a device");
214 static unsigned int ide_nohpa;
216 module_param_call(nohpa, ide_set_dev_param_mask, NULL, &ide_nohpa, 0);
217 MODULE_PARM_DESC(nohpa, "disable Host Protected Area for a device");
219 static unsigned int ide_noprobe;
221 module_param_call(noprobe, ide_set_dev_param_mask, NULL, &ide_noprobe, 0);
222 MODULE_PARM_DESC(noprobe, "skip probing for a device");
224 static unsigned int ide_nowerr;
226 module_param_call(nowerr, ide_set_dev_param_mask, NULL, &ide_nowerr, 0);
227 MODULE_PARM_DESC(nowerr, "ignore the ATA_DF bit for a device");
229 static unsigned int ide_cdroms;
231 module_param_call(cdrom, ide_set_dev_param_mask, NULL, &ide_cdroms, 0);
232 MODULE_PARM_DESC(cdrom, "force device as a CD-ROM");
234 struct chs_geom {
235 unsigned int cyl;
236 u8 head;
237 u8 sect;
240 static unsigned int ide_disks;
241 static struct chs_geom ide_disks_chs[MAX_HWIFS * MAX_DRIVES];
243 static int ide_set_disk_chs(const char *str, struct kernel_param *kp)
245 int a, b, c = 0, h = 0, s = 0, i, j = 1;
247 /* controller . device (0 or 1) : Cylinders , Heads , Sectors */
248 /* controller . device (0 or 1) : 1 (use CHS) | 0 (ignore CHS) */
249 if (sscanf(str, "%d.%d:%d,%d,%d", &a, &b, &c, &h, &s) != 5 &&
250 sscanf(str, "%d.%d:%d", &a, &b, &j) != 3)
251 return -EINVAL;
253 i = a * MAX_DRIVES + b;
255 if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
256 return -EINVAL;
258 if (c > INT_MAX || h > 255 || s > 255)
259 return -EINVAL;
261 if (j)
262 ide_disks |= (1 << i);
263 else
264 ide_disks &= ~(1 << i);
266 ide_disks_chs[i].cyl = c;
267 ide_disks_chs[i].head = h;
268 ide_disks_chs[i].sect = s;
270 return 0;
273 module_param_call(chs, ide_set_disk_chs, NULL, NULL, 0);
274 MODULE_PARM_DESC(chs, "force device as a disk (using CHS)");
276 static void ide_dev_apply_params(ide_drive_t *drive, u8 unit)
278 int i = drive->hwif->index * MAX_DRIVES + unit;
280 if (ide_nodma & (1 << i)) {
281 printk(KERN_INFO "ide: disallowing DMA for %s\n", drive->name);
282 drive->dev_flags |= IDE_DFLAG_NODMA;
284 if (ide_noflush & (1 << i)) {
285 printk(KERN_INFO "ide: disabling flush requests for %s\n",
286 drive->name);
287 drive->dev_flags |= IDE_DFLAG_NOFLUSH;
289 if (ide_nohpa & (1 << i)) {
290 printk(KERN_INFO "ide: disabling Host Protected Area for %s\n",
291 drive->name);
292 drive->dev_flags |= IDE_DFLAG_NOHPA;
294 if (ide_noprobe & (1 << i)) {
295 printk(KERN_INFO "ide: skipping probe for %s\n", drive->name);
296 drive->dev_flags |= IDE_DFLAG_NOPROBE;
298 if (ide_nowerr & (1 << i)) {
299 printk(KERN_INFO "ide: ignoring the ATA_DF bit for %s\n",
300 drive->name);
301 drive->bad_wstat = BAD_R_STAT;
303 if (ide_cdroms & (1 << i)) {
304 printk(KERN_INFO "ide: forcing %s as a CD-ROM\n", drive->name);
305 drive->dev_flags |= IDE_DFLAG_PRESENT;
306 drive->media = ide_cdrom;
307 /* an ATAPI device ignores DRDY */
308 drive->ready_stat = 0;
310 if (ide_disks & (1 << i)) {
311 drive->cyl = drive->bios_cyl = ide_disks_chs[i].cyl;
312 drive->head = drive->bios_head = ide_disks_chs[i].head;
313 drive->sect = drive->bios_sect = ide_disks_chs[i].sect;
315 printk(KERN_INFO "ide: forcing %s as a disk (%d/%d/%d)\n",
316 drive->name,
317 drive->cyl, drive->head, drive->sect);
319 drive->dev_flags |= IDE_DFLAG_FORCED_GEOM | IDE_DFLAG_PRESENT;
320 drive->media = ide_disk;
321 drive->ready_stat = ATA_DRDY;
325 static unsigned int ide_ignore_cable;
327 static int ide_set_ignore_cable(const char *s, struct kernel_param *kp)
329 int i, j = 1;
331 /* controller (ignore) */
332 /* controller : 1 (ignore) | 0 (use) */
333 if (sscanf(s, "%d:%d", &i, &j) != 2 && sscanf(s, "%d", &i) != 1)
334 return -EINVAL;
336 if (i >= MAX_HWIFS || j < 0 || j > 1)
337 return -EINVAL;
339 if (j)
340 ide_ignore_cable |= (1 << i);
341 else
342 ide_ignore_cable &= ~(1 << i);
344 return 0;
347 module_param_call(ignore_cable, ide_set_ignore_cable, NULL, NULL, 0);
348 MODULE_PARM_DESC(ignore_cable, "ignore cable detection");
350 void ide_port_apply_params(ide_hwif_t *hwif)
352 ide_drive_t *drive;
353 int i;
355 if (ide_ignore_cable & (1 << hwif->index)) {
356 printk(KERN_INFO "ide: ignoring cable detection for %s\n",
357 hwif->name);
358 hwif->cbl = ATA_CBL_PATA40_SHORT;
361 ide_port_for_each_dev(i, drive, hwif)
362 ide_dev_apply_params(drive, i);
366 * This is gets invoked once during initialization, to set *everything* up
368 static int __init ide_init(void)
370 int ret;
372 printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n");
374 ret = bus_register(&ide_bus_type);
375 if (ret < 0) {
376 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
377 return ret;
380 ide_port_class = class_create(THIS_MODULE, "ide_port");
381 if (IS_ERR(ide_port_class)) {
382 ret = PTR_ERR(ide_port_class);
383 goto out_port_class;
386 ide_acpi_init();
388 proc_ide_create();
390 return 0;
392 out_port_class:
393 bus_unregister(&ide_bus_type);
395 return ret;
398 static void __exit ide_exit(void)
400 proc_ide_destroy();
402 class_destroy(ide_port_class);
404 bus_unregister(&ide_bus_type);
407 module_init(ide_init);
408 module_exit(ide_exit);
410 MODULE_LICENSE("GPL");