aboutsummaryrefslogtreecommitdiff
path: root/drivers/ide/ide.c
blob: 6ee866fcc5dd035655cc8649101e8b3df1e578ea (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
/*
 *  Copyright (C) 1994-1998	    Linus Torvalds & authors (see below)
 *  Copyright (C) 2003-2005, 2007   Bartlomiej Zolnierkiewicz
 */

/*
 *  Mostly written by Mark Lord  <mlord@pobox.com>
 *                and Gadi Oxman <gadio@netvision.net.il>
 *                and Andre Hedrick <andre@linux-ide.org>
 *
 *  See linux/MAINTAINERS for address of current maintainer.
 *
 * This is the multiple IDE interface driver, as evolved from hd.c.
 * It supports up to MAX_HWIFS IDE interfaces, on one or more IRQs
 *   (usually 14 & 15).
 * There can be up to two drives per interface, as per the ATA-2 spec.
 *
 * ...
 *
 *  From hd.c:
 *  |
 *  | It traverses the request-list, using interrupts to jump between functions.
 *  | As nearly all functions can be called within interrupts, we may not sleep.
 *  | Special care is recommended.  Have Fun!
 *  |
 *  | modified by Drew Eckhardt to check nr of hd's from the CMOS.
 *  |
 *  | Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug
 *  | in the early extended-partition checks and added DM partitions.
 *  |
 *  | Early work on error handling by Mika Liljeberg (liljeber@cs.Helsinki.FI).
 *  |
 *  | IRQ-unmask, drive-id, multiple-mode, support for ">16 heads",
 *  | and general streamlining by Mark Lord (mlord@pobox.com).
 *
 *  October, 1994 -- Complete line-by-line overhaul for linux 1.1.x, by:
 *
 *	Mark Lord	(mlord@pobox.com)		(IDE Perf.Pkg)
 *	Delman Lee	(delman@ieee.org)		("Mr. atdisk2")
 *	Scott Snyder	(snyder@fnald0.fnal.gov)	(ATAPI IDE cd-rom)
 *
 *  This was a rewrite of just about everything from hd.c, though some original
 *  code is still sprinkled about.  Think of it as a major evolution, with
 *  inspiration from lots of linux users, esp.  hamish@zot.apana.org.au
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/major.h>
#include <linux/errno.h>
#include <linux/genhd.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/ide.h>
#include <linux/hdreg.h>
#include <linux/completion.h>
#include <linux/device.h>

struct class *ide_port_class;

/**
 * ide_device_get	-	get an additional reference to a ide_drive_t
 * @drive:	device to get a reference to
 *
 * Gets a reference to the ide_drive_t and increments the use count of the
 * underlying LLDD module.
 */
int ide_device_get(ide_drive_t *drive)
{
	struct device *host_dev;
	struct module *module;

	if (!get_device(&drive->gendev))
		return -ENXIO;

	host_dev = drive->hwif->host->dev[0];
	module = host_dev ? host_dev->driver->owner : NULL;

	if (module && !try_module_get(module)) {
		put_device(&drive->gendev);
		return -ENXIO;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(ide_device_get);

/**
 * ide_device_put	-	release a reference to a ide_drive_t
 * @drive:	device to release a reference on
 *
 * Release a reference to the ide_drive_t and decrements the use count of
 * the underlying LLDD module.
 */
void ide_device_put(ide_drive_t *drive)
{
#ifdef CONFIG_MODULE_UNLOAD
	struct device *host_dev = drive->hwif->host->dev[0];
	struct module *module = host_dev ? host_dev->driver->owner : NULL;

	module_put(module);
#endif
	put_device(&drive->gendev);
}
EXPORT_SYMBOL_GPL(ide_device_put);

static int ide_bus_match(struct device *dev, struct device_driver *drv)
{
	return 1;
}

static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
{
	ide_drive_t *drive = to_ide_device(dev);

	add_uevent_var(env, "MEDIA=%s", ide_media_string(drive));
	add_uevent_var(env, "DRIVENAME=%s", drive->name);
	add_uevent_var(env, "MODALIAS=ide:m-%s", ide_media_string(drive));
	return 0;
}

static int generic_ide_probe(struct device *dev)
{
	ide_drive_t *drive = to_ide_device(dev);
	struct ide_driver *drv = to_ide_driver(dev->driver);

	return drv->probe ? drv->probe(drive) : -ENODEV;
}

static int generic_ide_remove(struct device *dev)
{
	ide_drive_t *drive = to_ide_device(dev);
	struct ide_driver *drv = to_ide_driver(dev->driver);

	if (drv->remove)
		drv->remove(drive);

	return 0;
}

static void generic_ide_shutdown(struct device *dev)
{
	ide_drive_t *drive = to_ide_device(dev);
	struct ide_driver *drv = to_ide_driver(dev->driver);

	if (dev->driver && drv->shutdown)
		drv->shutdown(drive);
}

struct bus_type ide_bus_type = {
	.name		= "ide",
	.match		= ide_bus_match,
	.uevent		= ide_uevent,
	.probe		= generic_ide_probe,
	.remove		= generic_ide_remove,
	.shutdown	= generic_ide_shutdown,
	.dev_groups	= ide_dev_groups,
	.suspend	= generic_ide_suspend,
	.resume		= generic_ide_resume,
};

EXPORT_SYMBOL_GPL(ide_bus_type);

int ide_vlb_clk;
EXPORT_SYMBOL_GPL(ide_vlb_clk);

module_param_named(vlb_clock, ide_vlb_clk, int, 0);
MODULE_PARM_DESC(vlb_clock, "VLB clock frequency (in MHz)");

int ide_pci_clk;
EXPORT_SYMBOL_GPL(ide_pci_clk);

module_param_named(pci_clock, ide_pci_clk, int, 0);
MODULE_PARM_DESC(pci_clock, "PCI bus clock frequency (in MHz)");

static int ide_set_dev_param_mask(const char *s, const struct kernel_param *kp)
{
	unsigned int a, b, i, j = 1;
	unsigned int *dev_param_mask = (unsigned int *)kp->arg;

	/* controller . device (0 or 1) [ : 1 (set) | 0 (clear) ] */
	if (sscanf(s, "%u.%u:%u", &a, &b, &j) != 3 &&
	    sscanf(s, "%u.%u", &a, &b) != 2)
		return -EINVAL;

	i = a * MAX_DRIVES + b;

	if (i >= MAX_HWIFS * MAX_DRIVES || j > 1)
		return -EINVAL;

	if (j)
		*dev_param_mask |= (1 << i);
	else
		*dev_param_mask &= ~(1 << i);

	return 0;
}

static const struct kernel_param_ops param_ops_ide_dev_mask = {
	.set = ide_set_dev_param_mask
};

#define param_check_ide_dev_mask(name, p) param_check_uint(name, p)

static unsigned int ide_nodma;

module_param_named(nodma, ide_nodma, ide_dev_mask, 0);
MODULE_PARM_DESC(nodma, "disallow DMA for a device");

static unsigned int ide_noflush;

module_param_named(noflush, ide_noflush, ide_dev_mask, 0);
MODULE_PARM_DESC(noflush, "disable flush requests for a device");

static unsigned int ide_nohpa;

module_param_named(nohpa, ide_nohpa, ide_dev_mask, 0);
MODULE_PARM_DESC(nohpa, "disable Host Protected Area for a device");

static unsigned int ide_noprobe;

module_param_named(noprobe, ide_noprobe, ide_dev_mask, 0);
MODULE_PARM_DESC(noprobe, "skip probing for a device");

static unsigned int ide_nowerr;

module_param_named(nowerr, ide_nowerr, ide_dev_mask, 0);
MODULE_PARM_DESC(nowerr, "ignore the ATA_DF bit for a device");

static unsigned int ide_cdroms;

module_param_named(cdrom, ide_cdroms, ide_dev_mask, 0);
MODULE_PARM_DESC(cdrom, "force device as a CD-ROM");

struct chs_geom {
	unsigned int	cyl;
	u8		head;
	u8		sect;
};

static unsigned int ide_disks;
static struct chs_geom ide_disks_chs[MAX_HWIFS * MAX_DRIVES];

static int ide_set_disk_chs(const char *str, const struct kernel_param *kp)
{
	unsigned int a, b, c = 0, h = 0, s = 0, i, j = 1;

	/* controller . device (0 or 1) : Cylinders , Heads , Sectors */
	/* controller . device (0 or 1) : 1 (use CHS) | 0 (ignore CHS) */
	if (sscanf(str, "%u.%u:%u,%u,%u", &a, &b, &c, &h, &s) != 5 &&
	    sscanf(str, "%u.%u:%u", &a, &b, &j) != 3)
		return -EINVAL;

	i = a * MAX_DRIVES + b;

	if (i >= MAX_HWIFS * MAX_DRIVES || j > 1)
		return -EINVAL;

	if (c > INT_MAX || h > 255 || s > 255)
		return -EINVAL;

	if (j)
		ide_disks |= (1 << i);
	else
		ide_disks &= ~(1 << i);

	ide_disks_chs[i].cyl  = c;
	ide_disks_chs[i].head = h;
	ide_disks_chs[i].sect = s;

	return 0;
}

module_param_call(chs, ide_set_disk_chs, NULL, NULL, 0);
MODULE_PARM_DESC(chs, "force device as a disk (using CHS)");

static void ide_dev_apply_params(ide_drive_t *drive, u8 unit)
{
	int i = drive->hwif->index * MAX_DRIVES + unit;

	if (ide_nodma & (1 << i)) {
		printk(KERN_INFO "ide: disallowing DMA for %s\n", drive->name);
		drive->dev_flags |= IDE_DFLAG_NODMA;
	}
	if (ide_noflush & (1 << i)) {
		printk(KERN_INFO "ide: disabling flush requests for %s\n",
				 drive->name);
		drive->dev_flags |= IDE_DFLAG_NOFLUSH;
	}
	if (ide_nohpa & (1 << i)) {
		printk(KERN_INFO "ide: disabling Host Protected Area for %s\n",
				 drive->name);
		drive->dev_flags |= IDE_DFLAG_NOHPA;
	}
	if (ide_noprobe & (1 << i)) {
		printk(KERN_INFO "ide: skipping probe for %s\n", drive->name);
		drive->dev_flags |= IDE_DFLAG_NOPROBE;
	}
	if (ide_nowerr & (1 << i)) {
		printk(KERN_INFO "ide: ignoring the ATA_DF bit for %s\n",
				 drive->name);
		drive->bad_wstat = BAD_R_STAT;
	}
	if (ide_cdroms & (1 << i)) {
		printk(KERN_INFO "ide: forcing %s as a CD-ROM\n", drive->name);
		drive->dev_flags |= IDE_DFLAG_PRESENT;
		drive->media = ide_cdrom;
		/* an ATAPI device ignores DRDY */
		drive->ready_stat = 0;
	}
	if (ide_disks & (1 << i)) {
		drive->cyl  = drive->bios_cyl  = ide_disks_chs[i].cyl;
		drive->head = drive->bios_head = ide_disks_chs[i].head;
		drive->sect = drive->bios_sect = ide_disks_chs[i].sect;

		printk(KERN_INFO "ide: forcing %s as a disk (%d/%d/%d)\n",
				 drive->name,
				 drive->cyl, drive->head, drive->sect);

		drive->dev_flags |= IDE_DFLAG_FORCED_GEOM | IDE_DFLAG_PRESENT;
		drive->media = ide_disk;
		drive->ready_stat = ATA_DRDY;
	}
}

static unsigned int ide_ignore_cable;

static int ide_set_ignore_cable(const char *s, const struct kernel_param *kp)
{
	int i, j = 1;

	/* controller (ignore) */
	/* controller : 1 (ignore) | 0 (use) */
	if (sscanf(s, "%d:%d", &i, &j) != 2 && sscanf(s, "%d", &i) != 1)
		return -EINVAL;

	if (i >= MAX_HWIFS || j < 0 || j > 1)
		return -EINVAL;

	if (j)
		ide_ignore_cable |= (1 << i);
	else
		ide_ignore_cable &= ~(1 << i);

	return 0;
}

module_param_call(ignore_cable, ide_set_ignore_cable, NULL, NULL, 0);
MODULE_PARM_DESC(ignore_cable, "ignore cable detection");

void ide_port_apply_params(ide_hwif_t *hwif)
{
	ide_drive_t *drive;
	int i;

	if (ide_ignore_cable & (1 << hwif->index)) {
		printk(KERN_INFO "ide: ignoring cable detection for %s\n",
				 hwif->name);
		hwif->cbl = ATA_CBL_PATA40_SHORT;
	}

	ide_port_for_each_dev(i, drive, hwif)
		ide_dev_apply_params(drive, i);
}

/*
 * This is gets invoked once during initialization, to set *everything* up
 */
static int __init ide_init(void)
{
	int ret;

	printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n");

	ret = bus_register(&ide_bus_type);
	if (ret < 0) {
		printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
		return ret;
	}

	ide_port_class = class_create(THIS_MODULE, "ide_port");
	if (IS_ERR(ide_port_class)) {
		ret = PTR_ERR(ide_port_class);
		goto out_port_class;
	}

	ide_acpi_init();

	proc_ide_create();

	return 0;

out_port_class:
	bus_unregister(&ide_bus_type);

	return ret;
}

static void __exit ide_exit(void)
{
	proc_ide_destroy();

	class_destroy(ide_port_class);

	bus_unregister(&ide_bus_type);
}

module_init(ide_init);
module_exit(ide_exit);

MODULE_LICENSE("GPL");