ide.c revision 0af80c04e2f2e45ae09fceb17df8050f828a5c40 
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	/* controller . device (0 or 1) [ : 1 (set) | 0 (clear) ] */
341	if (sscanf(s, "%d.%d:%d", &a, &b, &j) != 3 &&
342	    sscanf(s, "%d.%d", &a, &b) != 2)
343		return -EINVAL;
344
345	i = a * MAX_DRIVES + b;
346
347	if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
348		return -EINVAL;
349
350	if (j)
351		*dev_param_mask |= (1 << i);
352	else
353		*dev_param_mask &= ~(1 << i);
354
355	return 0;
356}
357
358static unsigned int ide_nodma;
359
360module_param_call(nodma, ide_set_dev_param_mask, NULL, &ide_nodma, 0);
361MODULE_PARM_DESC(nodma, "disallow DMA for a device");
362
363static unsigned int ide_noflush;
364
365module_param_call(noflush, ide_set_dev_param_mask, NULL, &ide_noflush, 0);
366MODULE_PARM_DESC(noflush, "disable flush requests for a device");
367
368static unsigned int ide_noprobe;
369
370module_param_call(noprobe, ide_set_dev_param_mask, NULL, &ide_noprobe, 0);
371MODULE_PARM_DESC(noprobe, "skip probing for a device");
372
373static unsigned int ide_nowerr;
374
375module_param_call(nowerr, ide_set_dev_param_mask, NULL, &ide_nowerr, 0);
376MODULE_PARM_DESC(nowerr, "ignore the ATA_DF bit for a device");
377
378static unsigned int ide_cdroms;
379
380module_param_call(cdrom, ide_set_dev_param_mask, NULL, &ide_cdroms, 0);
381MODULE_PARM_DESC(cdrom, "force device as a CD-ROM");
382
383struct chs_geom {
384	unsigned int	cyl;
385	u8		head;
386	u8		sect;
387};
388
389static unsigned int ide_disks;
390static struct chs_geom ide_disks_chs[MAX_HWIFS * MAX_DRIVES];
391
392static int ide_set_disk_chs(const char *str, struct kernel_param *kp)
393{
394	int a, b, c = 0, h = 0, s = 0, i, j = 1;
395
396	/* controller . device (0 or 1) : Cylinders , Heads , Sectors */
397	/* controller . device (0 or 1) : 1 (use CHS) | 0 (ignore CHS) */
398	if (sscanf(str, "%d.%d:%d,%d,%d", &a, &b, &c, &h, &s) != 5 &&
399	    sscanf(str, "%d.%d:%d", &a, &b, &j) != 3)
400		return -EINVAL;
401
402	i = a * MAX_DRIVES + b;
403
404	if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
405		return -EINVAL;
406
407	if (c > INT_MAX || h > 255 || s > 255)
408		return -EINVAL;
409
410	if (j)
411		ide_disks |= (1 << i);
412	else
413		ide_disks &= ~(1 << i);
414
415	ide_disks_chs[i].cyl  = c;
416	ide_disks_chs[i].head = h;
417	ide_disks_chs[i].sect = s;
418
419	return 0;
420}
421
422module_param_call(chs, ide_set_disk_chs, NULL, NULL, 0);
423MODULE_PARM_DESC(chs, "force device as a disk (using CHS)");
424
425static void ide_dev_apply_params(ide_drive_t *drive, u8 unit)
426{
427	int i = drive->hwif->index * MAX_DRIVES + unit;
428
429	if (ide_nodma & (1 << i)) {
430		printk(KERN_INFO "ide: disallowing DMA for %s\n", drive->name);
431		drive->dev_flags |= IDE_DFLAG_NODMA;
432	}
433	if (ide_noflush & (1 << i)) {
434		printk(KERN_INFO "ide: disabling flush requests for %s\n",
435				 drive->name);
436		drive->dev_flags |= IDE_DFLAG_NOFLUSH;
437	}
438	if (ide_noprobe & (1 << i)) {
439		printk(KERN_INFO "ide: skipping probe for %s\n", drive->name);
440		drive->dev_flags |= IDE_DFLAG_NOPROBE;
441	}
442	if (ide_nowerr & (1 << i)) {
443		printk(KERN_INFO "ide: ignoring the ATA_DF bit for %s\n",
444				 drive->name);
445		drive->bad_wstat = BAD_R_STAT;
446	}
447	if (ide_cdroms & (1 << i)) {
448		printk(KERN_INFO "ide: forcing %s as a CD-ROM\n", drive->name);
449		drive->dev_flags |= IDE_DFLAG_PRESENT;
450		drive->media = ide_cdrom;
451		/* an ATAPI device ignores DRDY */
452		drive->ready_stat = 0;
453	}
454	if (ide_disks & (1 << i)) {
455		drive->cyl  = drive->bios_cyl  = ide_disks_chs[i].cyl;
456		drive->head = drive->bios_head = ide_disks_chs[i].head;
457		drive->sect = drive->bios_sect = ide_disks_chs[i].sect;
458
459		printk(KERN_INFO "ide: forcing %s as a disk (%d/%d/%d)\n",
460				 drive->name,
461				 drive->cyl, drive->head, drive->sect);
462
463		drive->dev_flags |= IDE_DFLAG_FORCED_GEOM | IDE_DFLAG_PRESENT;
464		drive->media = ide_disk;
465		drive->ready_stat = ATA_DRDY;
466	}
467}
468
469static unsigned int ide_ignore_cable;
470
471static int ide_set_ignore_cable(const char *s, struct kernel_param *kp)
472{
473	int i, j = 1;
474
475	/* controller (ignore) */
476	/* controller : 1 (ignore) | 0 (use) */
477	if (sscanf(s, "%d:%d", &i, &j) != 2 && sscanf(s, "%d", &i) != 1)
478		return -EINVAL;
479
480	if (i >= MAX_HWIFS || j < 0 || j > 1)
481		return -EINVAL;
482
483	if (j)
484		ide_ignore_cable |= (1 << i);
485	else
486		ide_ignore_cable &= ~(1 << i);
487
488	return 0;
489}
490
491module_param_call(ignore_cable, ide_set_ignore_cable, NULL, NULL, 0);
492MODULE_PARM_DESC(ignore_cable, "ignore cable detection");
493
494void ide_port_apply_params(ide_hwif_t *hwif)
495{
496	ide_drive_t *drive;
497	int i;
498
499	if (ide_ignore_cable & (1 << hwif->index)) {
500		printk(KERN_INFO "ide: ignoring cable detection for %s\n",
501				 hwif->name);
502		hwif->cbl = ATA_CBL_PATA40_SHORT;
503	}
504
505	ide_port_for_each_dev(i, drive, hwif)
506		ide_dev_apply_params(drive, i);
507}
508
509/*
510 * This is gets invoked once during initialization, to set *everything* up
511 */
512static int __init ide_init(void)
513{
514	int ret;
515
516	printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n");
517
518	ret = bus_register(&ide_bus_type);
519	if (ret < 0) {
520		printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
521		return ret;
522	}
523
524	ide_port_class = class_create(THIS_MODULE, "ide_port");
525	if (IS_ERR(ide_port_class)) {
526		ret = PTR_ERR(ide_port_class);
527		goto out_port_class;
528	}
529
530	proc_ide_create();
531
532	return 0;
533
534out_port_class:
535	bus_unregister(&ide_bus_type);
536
537	return ret;
538}
539
540static void __exit ide_exit(void)
541{
542	proc_ide_destroy();
543
544	class_destroy(ide_port_class);
545
546	bus_unregister(&ide_bus_type);
547}
548
549module_init(ide_init);
550module_exit(ide_exit);
551
552MODULE_LICENSE("GPL");
553