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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 | unsigned 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, "%u.%u:%u", &a, &b, &j) != 3 && | |
186 | sscanf(s, "%u.%u", &a, &b) != 2) | |
187 | return -EINVAL; | |
188 | ||
189 | i = a * MAX_DRIVES + b; | |
190 | ||
191 | if (i >= MAX_HWIFS * MAX_DRIVES || 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 | unsigned 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, "%u.%u:%u,%u,%u", &a, &b, &c, &h, &s) != 5 && | |
254 | sscanf(str, "%u.%u:%u", &a, &b, &j) != 3) | |
255 | return -EINVAL; | |
256 | ||
257 | i = a * MAX_DRIVES + b; | |
258 | ||
259 | if (i >= MAX_HWIFS * MAX_DRIVES || 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"); |