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

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