Root/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
62struct 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 */
71int 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}
89EXPORT_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 */
98void 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    if (module)
105        module_put(module);
106#endif
107    put_device(&drive->gendev);
108}
109EXPORT_SYMBOL_GPL(ide_device_put);
110
111static int ide_bus_match(struct device *dev, struct device_driver *drv)
112{
113    return 1;
114}
115
116static 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
126static 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
134static 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
145static 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
154struct 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_attrs = ide_dev_attrs,
162    .suspend = generic_ide_suspend,
163    .resume = generic_ide_resume,
164};
165
166EXPORT_SYMBOL_GPL(ide_bus_type);
167
168int ide_vlb_clk;
169EXPORT_SYMBOL_GPL(ide_vlb_clk);
170
171module_param_named(vlb_clock, ide_vlb_clk, int, 0);
172MODULE_PARM_DESC(vlb_clock, "VLB clock frequency (in MHz)");
173
174int ide_pci_clk;
175EXPORT_SYMBOL_GPL(ide_pci_clk);
176
177module_param_named(pci_clock, ide_pci_clk, int, 0);
178MODULE_PARM_DESC(pci_clock, "PCI bus clock frequency (in MHz)");
179
180static int ide_set_dev_param_mask(const char *s, const struct kernel_param *kp)
181{
182    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, "%d.%d:%d", &a, &b, &j) != 3 &&
187        sscanf(s, "%d.%d", &a, &b) != 2)
188        return -EINVAL;
189
190    i = a * MAX_DRIVES + b;
191
192    if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || 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
203static 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
209static unsigned int ide_nodma;
210
211module_param_named(nodma, ide_nodma, ide_dev_mask, 0);
212MODULE_PARM_DESC(nodma, "disallow DMA for a device");
213
214static unsigned int ide_noflush;
215
216module_param_named(noflush, ide_noflush, ide_dev_mask, 0);
217MODULE_PARM_DESC(noflush, "disable flush requests for a device");
218
219static unsigned int ide_nohpa;
220
221module_param_named(nohpa, ide_nohpa, ide_dev_mask, 0);
222MODULE_PARM_DESC(nohpa, "disable Host Protected Area for a device");
223
224static unsigned int ide_noprobe;
225
226module_param_named(noprobe, ide_noprobe, ide_dev_mask, 0);
227MODULE_PARM_DESC(noprobe, "skip probing for a device");
228
229static unsigned int ide_nowerr;
230
231module_param_named(nowerr, ide_nowerr, ide_dev_mask, 0);
232MODULE_PARM_DESC(nowerr, "ignore the ATA_DF bit for a device");
233
234static unsigned int ide_cdroms;
235
236module_param_named(cdrom, ide_cdroms, ide_dev_mask, 0);
237MODULE_PARM_DESC(cdrom, "force device as a CD-ROM");
238
239struct chs_geom {
240    unsigned int cyl;
241    u8 head;
242    u8 sect;
243};
244
245static unsigned int ide_disks;
246static struct chs_geom ide_disks_chs[MAX_HWIFS * MAX_DRIVES];
247
248static int ide_set_disk_chs(const char *str, struct kernel_param *kp)
249{
250    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, "%d.%d:%d,%d,%d", &a, &b, &c, &h, &s) != 5 &&
255        sscanf(str, "%d.%d:%d", &a, &b, &j) != 3)
256        return -EINVAL;
257
258    i = a * MAX_DRIVES + b;
259
260    if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || 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
278module_param_call(chs, ide_set_disk_chs, NULL, NULL, 0);
279MODULE_PARM_DESC(chs, "force device as a disk (using CHS)");
280
281static 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
330static unsigned int ide_ignore_cable;
331
332static int ide_set_ignore_cable(const char *s, 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
352module_param_call(ignore_cable, ide_set_ignore_cable, NULL, NULL, 0);
353MODULE_PARM_DESC(ignore_cable, "ignore cable detection");
354
355void 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 */
373static 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
397out_port_class:
398    bus_unregister(&ide_bus_type);
399
400    return ret;
401}
402
403static 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
412module_init(ide_init);
413module_exit(ide_exit);
414
415MODULE_LICENSE("GPL");
416

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