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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Copyright (C) 1991, 1992 Linus Torvalds | |
3 | * | |
4 | * This is the low-level hd interrupt support. It traverses the | |
5 | * request-list, using interrupts to jump between functions. As | |
6 | * all the functions are called within interrupts, we may not | |
7 | * sleep. Special care is recommended. | |
8 | * | |
9 | * modified by Drew Eckhardt to check nr of hd's from the CMOS. | |
10 | * | |
11 | * Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug | |
12 | * in the early extended-partition checks and added DM partitions | |
13 | * | |
14 | * IRQ-unmask, drive-id, multiple-mode, support for ">16 heads", | |
15 | * and general streamlining by Mark Lord. | |
16 | * | |
17 | * Removed 99% of above. Use Mark's ide driver for those options. | |
18 | * This is now a lightweight ST-506 driver. (Paul Gortmaker) | |
19 | * | |
20 | * Modified 1995 Russell King for ARM processor. | |
21 | * | |
22 | * Bugfix: max_sectors must be <= 255 or the wheels tend to come | |
23 | * off in a hurry once you queue things up - Paul G. 02/2001 | |
24 | */ | |
25 | ||
26 | /* Uncomment the following if you want verbose error reports. */ | |
27 | /* #define VERBOSE_ERRORS */ | |
28 | ||
29 | #include <linux/blkdev.h> | |
30 | #include <linux/errno.h> | |
31 | #include <linux/signal.h> | |
32 | #include <linux/interrupt.h> | |
33 | #include <linux/timer.h> | |
34 | #include <linux/fs.h> | |
35 | #include <linux/kernel.h> | |
36 | #include <linux/genhd.h> | |
1da177e4 LT |
37 | #include <linux/string.h> |
38 | #include <linux/ioport.h> | |
1da177e4 LT |
39 | #include <linux/init.h> |
40 | #include <linux/blkpg.h> | |
f26b3d75 | 41 | #include <linux/ata.h> |
1da177e4 LT |
42 | #include <linux/hdreg.h> |
43 | ||
4fe6e306 BZ |
44 | #define HD_IRQ 14 |
45 | ||
1da177e4 | 46 | #define REALLY_SLOW_IO |
1da177e4 LT |
47 | #include <asm/io.h> |
48 | #include <asm/uaccess.h> | |
49 | ||
50 | #ifdef __arm__ | |
51 | #undef HD_IRQ | |
52 | #endif | |
53 | #include <asm/irq.h> | |
54 | #ifdef __arm__ | |
55 | #define HD_IRQ IRQ_HARDDISK | |
56 | #endif | |
57 | ||
58 | /* Hd controller regster ports */ | |
59 | ||
60 | #define HD_DATA 0x1f0 /* _CTL when writing */ | |
61 | #define HD_ERROR 0x1f1 /* see err-bits */ | |
62 | #define HD_NSECTOR 0x1f2 /* nr of sectors to read/write */ | |
63 | #define HD_SECTOR 0x1f3 /* starting sector */ | |
64 | #define HD_LCYL 0x1f4 /* starting cylinder */ | |
65 | #define HD_HCYL 0x1f5 /* high byte of starting cyl */ | |
66 | #define HD_CURRENT 0x1f6 /* 101dhhhh , d=drive, hhhh=head */ | |
67 | #define HD_STATUS 0x1f7 /* see status-bits */ | |
68 | #define HD_FEATURE HD_ERROR /* same io address, read=error, write=feature */ | |
69 | #define HD_PRECOMP HD_FEATURE /* obsolete use of this port - predates IDE */ | |
70 | #define HD_COMMAND HD_STATUS /* same io address, read=status, write=cmd */ | |
71 | ||
72 | #define HD_CMD 0x3f6 /* used for resets */ | |
73 | #define HD_ALTSTATUS 0x3f6 /* same as HD_STATUS but doesn't clear irq */ | |
74 | ||
75 | /* Bits of HD_STATUS */ | |
76 | #define ERR_STAT 0x01 | |
77 | #define INDEX_STAT 0x02 | |
78 | #define ECC_STAT 0x04 /* Corrected error */ | |
79 | #define DRQ_STAT 0x08 | |
80 | #define SEEK_STAT 0x10 | |
81 | #define SERVICE_STAT SEEK_STAT | |
82 | #define WRERR_STAT 0x20 | |
83 | #define READY_STAT 0x40 | |
84 | #define BUSY_STAT 0x80 | |
85 | ||
86 | /* Bits for HD_ERROR */ | |
87 | #define MARK_ERR 0x01 /* Bad address mark */ | |
88 | #define TRK0_ERR 0x02 /* couldn't find track 0 */ | |
89 | #define ABRT_ERR 0x04 /* Command aborted */ | |
90 | #define MCR_ERR 0x08 /* media change request */ | |
91 | #define ID_ERR 0x10 /* ID field not found */ | |
92 | #define MC_ERR 0x20 /* media changed */ | |
93 | #define ECC_ERR 0x40 /* Uncorrectable ECC error */ | |
94 | #define BBD_ERR 0x80 /* pre-EIDE meaning: block marked bad */ | |
95 | #define ICRC_ERR 0x80 /* new meaning: CRC error during transfer */ | |
96 | ||
97 | static DEFINE_SPINLOCK(hd_lock); | |
98 | static struct request_queue *hd_queue; | |
8a12c4a4 | 99 | static struct request *hd_req; |
1da177e4 | 100 | |
1da177e4 LT |
101 | #define TIMEOUT_VALUE (6*HZ) |
102 | #define HD_DELAY 0 | |
103 | ||
104 | #define MAX_ERRORS 16 /* Max read/write errors/sector */ | |
105 | #define RESET_FREQ 8 /* Reset controller every 8th retry */ | |
106 | #define RECAL_FREQ 4 /* Recalibrate every 4th retry */ | |
107 | #define MAX_HD 2 | |
108 | ||
109 | #define STAT_OK (READY_STAT|SEEK_STAT) | |
110 | #define OK_STATUS(s) (((s)&(STAT_OK|(BUSY_STAT|WRERR_STAT|ERR_STAT)))==STAT_OK) | |
111 | ||
112 | static void recal_intr(void); | |
113 | static void bad_rw_intr(void); | |
114 | ||
115 | static int reset; | |
116 | static int hd_error; | |
117 | ||
118 | /* | |
119 | * This struct defines the HD's and their types. | |
120 | */ | |
121 | struct hd_i_struct { | |
ec29782b | 122 | unsigned int head, sect, cyl, wpcom, lzone, ctl; |
1da177e4 LT |
123 | int unit; |
124 | int recalibrate; | |
125 | int special_op; | |
126 | }; | |
ec29782b | 127 | |
1da177e4 LT |
128 | #ifdef HD_TYPE |
129 | static struct hd_i_struct hd_info[] = { HD_TYPE }; | |
ecea5730 | 130 | static int NR_HD = ARRAY_SIZE(hd_info); |
1da177e4 LT |
131 | #else |
132 | static struct hd_i_struct hd_info[MAX_HD]; | |
133 | static int NR_HD; | |
134 | #endif | |
135 | ||
136 | static struct gendisk *hd_gendisk[MAX_HD]; | |
137 | ||
138 | static struct timer_list device_timer; | |
139 | ||
140 | #define TIMEOUT_VALUE (6*HZ) | |
141 | ||
142 | #define SET_TIMER \ | |
143 | do { \ | |
144 | mod_timer(&device_timer, jiffies + TIMEOUT_VALUE); \ | |
145 | } while (0) | |
146 | ||
147 | static void (*do_hd)(void) = NULL; | |
148 | #define SET_HANDLER(x) \ | |
149 | if ((do_hd = (x)) != NULL) \ | |
150 | SET_TIMER; \ | |
151 | else \ | |
152 | del_timer(&device_timer); | |
153 | ||
154 | ||
155 | #if (HD_DELAY > 0) | |
306e440d | 156 | |
334955ef | 157 | #include <linux/i8253.h> |
306e440d | 158 | |
1da177e4 LT |
159 | unsigned long last_req; |
160 | ||
161 | unsigned long read_timer(void) | |
162 | { | |
1da177e4 LT |
163 | unsigned long t, flags; |
164 | int i; | |
165 | ||
ced918eb | 166 | raw_spin_lock_irqsave(&i8253_lock, flags); |
1da177e4 | 167 | t = jiffies * 11932; |
ec29782b | 168 | outb_p(0, 0x43); |
1da177e4 LT |
169 | i = inb_p(0x40); |
170 | i |= inb(0x40) << 8; | |
ced918eb | 171 | raw_spin_unlock_irqrestore(&i8253_lock, flags); |
1da177e4 LT |
172 | return(t - i); |
173 | } | |
174 | #endif | |
175 | ||
176 | static void __init hd_setup(char *str, int *ints) | |
177 | { | |
178 | int hdind = 0; | |
179 | ||
180 | if (ints[0] != 3) | |
181 | return; | |
182 | if (hd_info[0].head != 0) | |
ec29782b | 183 | hdind = 1; |
1da177e4 LT |
184 | hd_info[hdind].head = ints[2]; |
185 | hd_info[hdind].sect = ints[3]; | |
186 | hd_info[hdind].cyl = ints[1]; | |
187 | hd_info[hdind].wpcom = 0; | |
188 | hd_info[hdind].lzone = ints[1]; | |
189 | hd_info[hdind].ctl = (ints[2] > 8 ? 8 : 0); | |
190 | NR_HD = hdind+1; | |
191 | } | |
192 | ||
8a12c4a4 TH |
193 | static bool hd_end_request(int err, unsigned int bytes) |
194 | { | |
195 | if (__blk_end_request(hd_req, err, bytes)) | |
196 | return true; | |
197 | hd_req = NULL; | |
198 | return false; | |
199 | } | |
200 | ||
201 | static bool hd_end_request_cur(int err) | |
202 | { | |
203 | return hd_end_request(err, blk_rq_cur_bytes(hd_req)); | |
204 | } | |
205 | ||
ec29782b | 206 | static void dump_status(const char *msg, unsigned int stat) |
1da177e4 LT |
207 | { |
208 | char *name = "hd?"; | |
8a12c4a4 TH |
209 | if (hd_req) |
210 | name = hd_req->rq_disk->disk_name; | |
1da177e4 LT |
211 | |
212 | #ifdef VERBOSE_ERRORS | |
213 | printk("%s: %s: status=0x%02x { ", name, msg, stat & 0xff); | |
214 | if (stat & BUSY_STAT) printk("Busy "); | |
215 | if (stat & READY_STAT) printk("DriveReady "); | |
216 | if (stat & WRERR_STAT) printk("WriteFault "); | |
217 | if (stat & SEEK_STAT) printk("SeekComplete "); | |
218 | if (stat & DRQ_STAT) printk("DataRequest "); | |
219 | if (stat & ECC_STAT) printk("CorrectedError "); | |
220 | if (stat & INDEX_STAT) printk("Index "); | |
221 | if (stat & ERR_STAT) printk("Error "); | |
222 | printk("}\n"); | |
223 | if ((stat & ERR_STAT) == 0) { | |
224 | hd_error = 0; | |
225 | } else { | |
226 | hd_error = inb(HD_ERROR); | |
227 | printk("%s: %s: error=0x%02x { ", name, msg, hd_error & 0xff); | |
228 | if (hd_error & BBD_ERR) printk("BadSector "); | |
229 | if (hd_error & ECC_ERR) printk("UncorrectableError "); | |
230 | if (hd_error & ID_ERR) printk("SectorIdNotFound "); | |
231 | if (hd_error & ABRT_ERR) printk("DriveStatusError "); | |
232 | if (hd_error & TRK0_ERR) printk("TrackZeroNotFound "); | |
233 | if (hd_error & MARK_ERR) printk("AddrMarkNotFound "); | |
234 | printk("}"); | |
235 | if (hd_error & (BBD_ERR|ECC_ERR|ID_ERR|MARK_ERR)) { | |
236 | printk(", CHS=%d/%d/%d", (inb(HD_HCYL)<<8) + inb(HD_LCYL), | |
237 | inb(HD_CURRENT) & 0xf, inb(HD_SECTOR)); | |
8a12c4a4 TH |
238 | if (hd_req) |
239 | printk(", sector=%ld", blk_rq_pos(hd_req)); | |
1da177e4 LT |
240 | } |
241 | printk("\n"); | |
242 | } | |
243 | #else | |
244 | printk("%s: %s: status=0x%02x.\n", name, msg, stat & 0xff); | |
245 | if ((stat & ERR_STAT) == 0) { | |
246 | hd_error = 0; | |
247 | } else { | |
248 | hd_error = inb(HD_ERROR); | |
249 | printk("%s: %s: error=0x%02x.\n", name, msg, hd_error & 0xff); | |
250 | } | |
251 | #endif | |
252 | } | |
253 | ||
254 | static void check_status(void) | |
255 | { | |
256 | int i = inb_p(HD_STATUS); | |
257 | ||
258 | if (!OK_STATUS(i)) { | |
259 | dump_status("check_status", i); | |
260 | bad_rw_intr(); | |
261 | } | |
262 | } | |
263 | ||
264 | static int controller_busy(void) | |
265 | { | |
266 | int retries = 100000; | |
267 | unsigned char status; | |
268 | ||
269 | do { | |
270 | status = inb_p(HD_STATUS); | |
271 | } while ((status & BUSY_STAT) && --retries); | |
272 | return status; | |
273 | } | |
274 | ||
275 | static int status_ok(void) | |
276 | { | |
277 | unsigned char status = inb_p(HD_STATUS); | |
278 | ||
279 | if (status & BUSY_STAT) | |
280 | return 1; /* Ancient, but does it make sense??? */ | |
281 | if (status & WRERR_STAT) | |
282 | return 0; | |
283 | if (!(status & READY_STAT)) | |
284 | return 0; | |
285 | if (!(status & SEEK_STAT)) | |
286 | return 0; | |
287 | return 1; | |
288 | } | |
289 | ||
290 | static int controller_ready(unsigned int drive, unsigned int head) | |
291 | { | |
292 | int retry = 100; | |
293 | ||
294 | do { | |
295 | if (controller_busy() & BUSY_STAT) | |
296 | return 0; | |
297 | outb_p(0xA0 | (drive<<4) | head, HD_CURRENT); | |
298 | if (status_ok()) | |
299 | return 1; | |
300 | } while (--retry); | |
301 | return 0; | |
302 | } | |
303 | ||
1da177e4 LT |
304 | static void hd_out(struct hd_i_struct *disk, |
305 | unsigned int nsect, | |
306 | unsigned int sect, | |
307 | unsigned int head, | |
308 | unsigned int cyl, | |
309 | unsigned int cmd, | |
310 | void (*intr_addr)(void)) | |
311 | { | |
312 | unsigned short port; | |
313 | ||
314 | #if (HD_DELAY > 0) | |
315 | while (read_timer() - last_req < HD_DELAY) | |
316 | /* nothing */; | |
317 | #endif | |
318 | if (reset) | |
319 | return; | |
320 | if (!controller_ready(disk->unit, head)) { | |
321 | reset = 1; | |
322 | return; | |
323 | } | |
324 | SET_HANDLER(intr_addr); | |
ec29782b PC |
325 | outb_p(disk->ctl, HD_CMD); |
326 | port = HD_DATA; | |
327 | outb_p(disk->wpcom >> 2, ++port); | |
328 | outb_p(nsect, ++port); | |
329 | outb_p(sect, ++port); | |
330 | outb_p(cyl, ++port); | |
331 | outb_p(cyl >> 8, ++port); | |
332 | outb_p(0xA0 | (disk->unit << 4) | head, ++port); | |
333 | outb_p(cmd, ++port); | |
1da177e4 LT |
334 | } |
335 | ||
336 | static void hd_request (void); | |
337 | ||
338 | static int drive_busy(void) | |
339 | { | |
340 | unsigned int i; | |
341 | unsigned char c; | |
342 | ||
343 | for (i = 0; i < 500000 ; i++) { | |
344 | c = inb_p(HD_STATUS); | |
345 | if ((c & (BUSY_STAT | READY_STAT | SEEK_STAT)) == STAT_OK) | |
346 | return 0; | |
347 | } | |
348 | dump_status("reset timed out", c); | |
349 | return 1; | |
350 | } | |
351 | ||
352 | static void reset_controller(void) | |
353 | { | |
354 | int i; | |
355 | ||
ec29782b PC |
356 | outb_p(4, HD_CMD); |
357 | for (i = 0; i < 1000; i++) barrier(); | |
358 | outb_p(hd_info[0].ctl & 0x0f, HD_CMD); | |
359 | for (i = 0; i < 1000; i++) barrier(); | |
1da177e4 LT |
360 | if (drive_busy()) |
361 | printk("hd: controller still busy\n"); | |
362 | else if ((hd_error = inb(HD_ERROR)) != 1) | |
ec29782b | 363 | printk("hd: controller reset failed: %02x\n", hd_error); |
1da177e4 LT |
364 | } |
365 | ||
366 | static void reset_hd(void) | |
367 | { | |
368 | static int i; | |
369 | ||
370 | repeat: | |
371 | if (reset) { | |
372 | reset = 0; | |
373 | i = -1; | |
374 | reset_controller(); | |
375 | } else { | |
376 | check_status(); | |
377 | if (reset) | |
378 | goto repeat; | |
379 | } | |
380 | if (++i < NR_HD) { | |
381 | struct hd_i_struct *disk = &hd_info[i]; | |
382 | disk->special_op = disk->recalibrate = 1; | |
ec29782b | 383 | hd_out(disk, disk->sect, disk->sect, disk->head-1, |
f26b3d75 | 384 | disk->cyl, ATA_CMD_INIT_DEV_PARAMS, &reset_hd); |
1da177e4 LT |
385 | if (reset) |
386 | goto repeat; | |
387 | } else | |
388 | hd_request(); | |
389 | } | |
390 | ||
391 | /* | |
392 | * Ok, don't know what to do with the unexpected interrupts: on some machines | |
393 | * doing a reset and a retry seems to result in an eternal loop. Right now I | |
394 | * ignore it, and just set the timeout. | |
395 | * | |
396 | * On laptops (and "green" PCs), an unexpected interrupt occurs whenever the | |
397 | * drive enters "idle", "standby", or "sleep" mode, so if the status looks | |
398 | * "good", we just ignore the interrupt completely. | |
399 | */ | |
400 | static void unexpected_hd_interrupt(void) | |
401 | { | |
402 | unsigned int stat = inb_p(HD_STATUS); | |
403 | ||
404 | if (stat & (BUSY_STAT|DRQ_STAT|ECC_STAT|ERR_STAT)) { | |
ec29782b | 405 | dump_status("unexpected interrupt", stat); |
1da177e4 LT |
406 | SET_TIMER; |
407 | } | |
408 | } | |
409 | ||
410 | /* | |
411 | * bad_rw_intr() now tries to be a bit smarter and does things | |
412 | * according to the error returned by the controller. | |
413 | * -Mika Liljeberg (liljeber@cs.Helsinki.FI) | |
414 | */ | |
415 | static void bad_rw_intr(void) | |
416 | { | |
8a12c4a4 TH |
417 | struct request *req = hd_req; |
418 | ||
1da177e4 LT |
419 | if (req != NULL) { |
420 | struct hd_i_struct *disk = req->rq_disk->private_data; | |
421 | if (++req->errors >= MAX_ERRORS || (hd_error & BBD_ERR)) { | |
8a12c4a4 | 422 | hd_end_request_cur(-EIO); |
1da177e4 LT |
423 | disk->special_op = disk->recalibrate = 1; |
424 | } else if (req->errors % RESET_FREQ == 0) | |
425 | reset = 1; | |
426 | else if ((hd_error & TRK0_ERR) || req->errors % RECAL_FREQ == 0) | |
427 | disk->special_op = disk->recalibrate = 1; | |
428 | /* Otherwise just retry */ | |
429 | } | |
430 | } | |
431 | ||
432 | static inline int wait_DRQ(void) | |
433 | { | |
b004223d AM |
434 | int retries; |
435 | int stat; | |
1da177e4 | 436 | |
b004223d AM |
437 | for (retries = 0; retries < 100000; retries++) { |
438 | stat = inb_p(HD_STATUS); | |
439 | if (stat & DRQ_STAT) | |
1da177e4 | 440 | return 0; |
b004223d | 441 | } |
1da177e4 LT |
442 | dump_status("wait_DRQ", stat); |
443 | return -1; | |
444 | } | |
445 | ||
446 | static void read_intr(void) | |
447 | { | |
448 | struct request *req; | |
449 | int i, retries = 100000; | |
450 | ||
451 | do { | |
452 | i = (unsigned) inb_p(HD_STATUS); | |
453 | if (i & BUSY_STAT) | |
454 | continue; | |
455 | if (!OK_STATUS(i)) | |
456 | break; | |
457 | if (i & DRQ_STAT) | |
458 | goto ok_to_read; | |
459 | } while (--retries > 0); | |
460 | dump_status("read_intr", i); | |
461 | bad_rw_intr(); | |
462 | hd_request(); | |
463 | return; | |
e091eb67 | 464 | |
1da177e4 | 465 | ok_to_read: |
8a12c4a4 | 466 | req = hd_req; |
b4f42e28 | 467 | insw(HD_DATA, bio_data(req->bio), 256); |
1da177e4 | 468 | #ifdef DEBUG |
83096ebf TH |
469 | printk("%s: read: sector %ld, remaining = %u, buffer=%p\n", |
470 | req->rq_disk->disk_name, blk_rq_pos(req) + 1, | |
b4f42e28 | 471 | blk_rq_sectors(req) - 1, bio_data(req->bio)+512); |
1da177e4 | 472 | #endif |
8a12c4a4 | 473 | if (hd_end_request(0, 512)) { |
1da177e4 LT |
474 | SET_HANDLER(&read_intr); |
475 | return; | |
476 | } | |
e091eb67 | 477 | |
1da177e4 LT |
478 | (void) inb_p(HD_STATUS); |
479 | #if (HD_DELAY > 0) | |
480 | last_req = read_timer(); | |
481 | #endif | |
e091eb67 | 482 | hd_request(); |
1da177e4 LT |
483 | } |
484 | ||
485 | static void write_intr(void) | |
486 | { | |
8a12c4a4 | 487 | struct request *req = hd_req; |
1da177e4 LT |
488 | int i; |
489 | int retries = 100000; | |
490 | ||
491 | do { | |
492 | i = (unsigned) inb_p(HD_STATUS); | |
493 | if (i & BUSY_STAT) | |
494 | continue; | |
495 | if (!OK_STATUS(i)) | |
496 | break; | |
83096ebf | 497 | if ((blk_rq_sectors(req) <= 1) || (i & DRQ_STAT)) |
1da177e4 LT |
498 | goto ok_to_write; |
499 | } while (--retries > 0); | |
500 | dump_status("write_intr", i); | |
501 | bad_rw_intr(); | |
502 | hd_request(); | |
503 | return; | |
e091eb67 | 504 | |
1da177e4 | 505 | ok_to_write: |
8a12c4a4 | 506 | if (hd_end_request(0, 512)) { |
1da177e4 | 507 | SET_HANDLER(&write_intr); |
b4f42e28 | 508 | outsw(HD_DATA, bio_data(req->bio), 256); |
e091eb67 TH |
509 | return; |
510 | } | |
511 | ||
1da177e4 | 512 | #if (HD_DELAY > 0) |
e091eb67 | 513 | last_req = read_timer(); |
1da177e4 | 514 | #endif |
e091eb67 | 515 | hd_request(); |
1da177e4 LT |
516 | } |
517 | ||
518 | static void recal_intr(void) | |
519 | { | |
520 | check_status(); | |
521 | #if (HD_DELAY > 0) | |
522 | last_req = read_timer(); | |
523 | #endif | |
524 | hd_request(); | |
525 | } | |
526 | ||
527 | /* | |
528 | * This is another of the error-routines I don't know what to do with. The | |
529 | * best idea seems to just set reset, and start all over again. | |
530 | */ | |
531 | static void hd_times_out(unsigned long dummy) | |
532 | { | |
533 | char *name; | |
534 | ||
535 | do_hd = NULL; | |
536 | ||
8a12c4a4 | 537 | if (!hd_req) |
1da177e4 LT |
538 | return; |
539 | ||
e93b9fb7 | 540 | spin_lock_irq(hd_queue->queue_lock); |
1da177e4 | 541 | reset = 1; |
8a12c4a4 | 542 | name = hd_req->rq_disk->disk_name; |
1da177e4 | 543 | printk("%s: timeout\n", name); |
8a12c4a4 | 544 | if (++hd_req->errors >= MAX_ERRORS) { |
1da177e4 LT |
545 | #ifdef DEBUG |
546 | printk("%s: too many errors\n", name); | |
547 | #endif | |
8a12c4a4 | 548 | hd_end_request_cur(-EIO); |
1da177e4 | 549 | } |
1da177e4 | 550 | hd_request(); |
e93b9fb7 | 551 | spin_unlock_irq(hd_queue->queue_lock); |
1da177e4 LT |
552 | } |
553 | ||
554 | static int do_special_op(struct hd_i_struct *disk, struct request *req) | |
555 | { | |
556 | if (disk->recalibrate) { | |
557 | disk->recalibrate = 0; | |
f26b3d75 | 558 | hd_out(disk, disk->sect, 0, 0, 0, ATA_CMD_RESTORE, &recal_intr); |
1da177e4 LT |
559 | return reset; |
560 | } | |
561 | if (disk->head > 16) { | |
ec29782b | 562 | printk("%s: cannot handle device with more than 16 heads - giving up\n", req->rq_disk->disk_name); |
8a12c4a4 | 563 | hd_end_request_cur(-EIO); |
1da177e4 LT |
564 | } |
565 | disk->special_op = 0; | |
566 | return 1; | |
567 | } | |
568 | ||
569 | /* | |
570 | * The driver enables interrupts as much as possible. In order to do this, | |
571 | * (a) the device-interrupt is disabled before entering hd_request(), | |
572 | * and (b) the timeout-interrupt is disabled before the sti(). | |
573 | * | |
574 | * Interrupts are still masked (by default) whenever we are exchanging | |
575 | * data/cmds with a drive, because some drives seem to have very poor | |
576 | * tolerance for latency during I/O. The IDE driver has support to unmask | |
577 | * interrupts for non-broken hardware, so use that driver if required. | |
578 | */ | |
579 | static void hd_request(void) | |
580 | { | |
581 | unsigned int block, nsect, sec, track, head, cyl; | |
582 | struct hd_i_struct *disk; | |
583 | struct request *req; | |
584 | ||
585 | if (do_hd) | |
586 | return; | |
587 | repeat: | |
588 | del_timer(&device_timer); | |
1da177e4 | 589 | |
8a12c4a4 | 590 | if (!hd_req) { |
9934c8c0 | 591 | hd_req = blk_fetch_request(hd_queue); |
8a12c4a4 TH |
592 | if (!hd_req) { |
593 | do_hd = NULL; | |
594 | return; | |
595 | } | |
1da177e4 | 596 | } |
8a12c4a4 | 597 | req = hd_req; |
1da177e4 LT |
598 | |
599 | if (reset) { | |
1da177e4 LT |
600 | reset_hd(); |
601 | return; | |
602 | } | |
603 | disk = req->rq_disk->private_data; | |
83096ebf TH |
604 | block = blk_rq_pos(req); |
605 | nsect = blk_rq_sectors(req); | |
1da177e4 LT |
606 | if (block >= get_capacity(req->rq_disk) || |
607 | ((block+nsect) > get_capacity(req->rq_disk))) { | |
608 | printk("%s: bad access: block=%d, count=%d\n", | |
609 | req->rq_disk->disk_name, block, nsect); | |
8a12c4a4 | 610 | hd_end_request_cur(-EIO); |
1da177e4 LT |
611 | goto repeat; |
612 | } | |
613 | ||
614 | if (disk->special_op) { | |
615 | if (do_special_op(disk, req)) | |
616 | goto repeat; | |
617 | return; | |
618 | } | |
619 | sec = block % disk->sect + 1; | |
620 | track = block / disk->sect; | |
621 | head = track % disk->head; | |
622 | cyl = track / disk->head; | |
623 | #ifdef DEBUG | |
624 | printk("%s: %sing: CHS=%d/%d/%d, sectors=%d, buffer=%p\n", | |
e654bc43 BH |
625 | req->rq_disk->disk_name, |
626 | req_data_dir(req) == READ ? "read" : "writ", | |
b4f42e28 | 627 | cyl, head, sec, nsect, bio_data(req->bio)); |
1da177e4 | 628 | #endif |
33659ebb | 629 | if (req->cmd_type == REQ_TYPE_FS) { |
1da177e4 LT |
630 | switch (rq_data_dir(req)) { |
631 | case READ: | |
f26b3d75 | 632 | hd_out(disk, nsect, sec, head, cyl, ATA_CMD_PIO_READ, |
ec29782b | 633 | &read_intr); |
1da177e4 LT |
634 | if (reset) |
635 | goto repeat; | |
636 | break; | |
637 | case WRITE: | |
f26b3d75 | 638 | hd_out(disk, nsect, sec, head, cyl, ATA_CMD_PIO_WRITE, |
ec29782b | 639 | &write_intr); |
1da177e4 LT |
640 | if (reset) |
641 | goto repeat; | |
642 | if (wait_DRQ()) { | |
643 | bad_rw_intr(); | |
644 | goto repeat; | |
645 | } | |
b4f42e28 | 646 | outsw(HD_DATA, bio_data(req->bio), 256); |
1da177e4 LT |
647 | break; |
648 | default: | |
649 | printk("unknown hd-command\n"); | |
8a12c4a4 | 650 | hd_end_request_cur(-EIO); |
1da177e4 LT |
651 | break; |
652 | } | |
653 | } | |
654 | } | |
655 | ||
ec29782b | 656 | static void do_hd_request(struct request_queue *q) |
1da177e4 | 657 | { |
1da177e4 | 658 | hd_request(); |
1da177e4 LT |
659 | } |
660 | ||
a885c8c4 | 661 | static int hd_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
1da177e4 | 662 | { |
a885c8c4 CH |
663 | struct hd_i_struct *disk = bdev->bd_disk->private_data; |
664 | ||
665 | geo->heads = disk->head; | |
666 | geo->sectors = disk->sect; | |
667 | geo->cylinders = disk->cyl; | |
668 | return 0; | |
1da177e4 LT |
669 | } |
670 | ||
671 | /* | |
672 | * Releasing a block device means we sync() it, so that it can safely | |
673 | * be forgotten about... | |
674 | */ | |
675 | ||
7d12e780 | 676 | static irqreturn_t hd_interrupt(int irq, void *dev_id) |
1da177e4 LT |
677 | { |
678 | void (*handler)(void) = do_hd; | |
679 | ||
e93b9fb7 TH |
680 | spin_lock(hd_queue->queue_lock); |
681 | ||
1da177e4 LT |
682 | do_hd = NULL; |
683 | del_timer(&device_timer); | |
684 | if (!handler) | |
685 | handler = unexpected_hd_interrupt; | |
686 | handler(); | |
e93b9fb7 TH |
687 | |
688 | spin_unlock(hd_queue->queue_lock); | |
689 | ||
1da177e4 LT |
690 | return IRQ_HANDLED; |
691 | } | |
692 | ||
83d5cde4 | 693 | static const struct block_device_operations hd_fops = { |
a885c8c4 | 694 | .getgeo = hd_getgeo, |
1da177e4 LT |
695 | }; |
696 | ||
1da177e4 LT |
697 | static int __init hd_init(void) |
698 | { | |
699 | int drive; | |
700 | ||
ddeb9c3e | 701 | if (register_blkdev(HD_MAJOR, "hd")) |
1da177e4 LT |
702 | return -1; |
703 | ||
704 | hd_queue = blk_init_queue(do_hd_request, &hd_lock); | |
705 | if (!hd_queue) { | |
ddeb9c3e | 706 | unregister_blkdev(HD_MAJOR, "hd"); |
1da177e4 LT |
707 | return -ENOMEM; |
708 | } | |
709 | ||
086fa5ff | 710 | blk_queue_max_hw_sectors(hd_queue, 255); |
1da177e4 LT |
711 | init_timer(&device_timer); |
712 | device_timer.function = hd_times_out; | |
e1defc4f | 713 | blk_queue_logical_block_size(hd_queue, 512); |
1da177e4 | 714 | |
1da177e4 | 715 | if (!NR_HD) { |
48dd643c PA |
716 | /* |
717 | * We don't know anything about the drive. This means | |
1da177e4 LT |
718 | * that you *MUST* specify the drive parameters to the |
719 | * kernel yourself. | |
48dd643c PA |
720 | * |
721 | * If we were on an i386, we used to read this info from | |
722 | * the BIOS or CMOS. This doesn't work all that well, | |
723 | * since this assumes that this is a primary or secondary | |
724 | * drive, and if we're using this legacy driver, it's | |
25985edc | 725 | * probably an auxiliary controller added to recover |
48dd643c PA |
726 | * legacy data off an ST-506 drive. Either way, it's |
727 | * definitely safest to have the user explicitly specify | |
728 | * the information. | |
1da177e4 LT |
729 | */ |
730 | printk("hd: no drives specified - use hd=cyl,head,sectors" | |
731 | " on kernel command line\n"); | |
1da177e4 | 732 | goto out; |
48dd643c | 733 | } |
1da177e4 | 734 | |
ec29782b | 735 | for (drive = 0 ; drive < NR_HD ; drive++) { |
1da177e4 LT |
736 | struct gendisk *disk = alloc_disk(64); |
737 | struct hd_i_struct *p = &hd_info[drive]; | |
738 | if (!disk) | |
739 | goto Enomem; | |
ddeb9c3e | 740 | disk->major = HD_MAJOR; |
1da177e4 LT |
741 | disk->first_minor = drive << 6; |
742 | disk->fops = &hd_fops; | |
743 | sprintf(disk->disk_name, "hd%c", 'a'+drive); | |
744 | disk->private_data = p; | |
745 | set_capacity(disk, p->head * p->sect * p->cyl); | |
746 | disk->queue = hd_queue; | |
747 | p->unit = drive; | |
748 | hd_gendisk[drive] = disk; | |
ec29782b | 749 | printk("%s: %luMB, CHS=%d/%d/%d\n", |
1da177e4 LT |
750 | disk->disk_name, (unsigned long)get_capacity(disk)/2048, |
751 | p->cyl, p->head, p->sect); | |
752 | } | |
753 | ||
fc2021fb | 754 | if (request_irq(HD_IRQ, hd_interrupt, 0, "hd", NULL)) { |
1da177e4 LT |
755 | printk("hd: unable to get IRQ%d for the hard disk driver\n", |
756 | HD_IRQ); | |
757 | goto out1; | |
758 | } | |
759 | if (!request_region(HD_DATA, 8, "hd")) { | |
760 | printk(KERN_WARNING "hd: port 0x%x busy\n", HD_DATA); | |
761 | goto out2; | |
762 | } | |
763 | if (!request_region(HD_CMD, 1, "hd(cmd)")) { | |
764 | printk(KERN_WARNING "hd: port 0x%x busy\n", HD_CMD); | |
765 | goto out3; | |
766 | } | |
767 | ||
768 | /* Let them fly */ | |
ec29782b | 769 | for (drive = 0; drive < NR_HD; drive++) |
1da177e4 LT |
770 | add_disk(hd_gendisk[drive]); |
771 | ||
772 | return 0; | |
773 | ||
774 | out3: | |
775 | release_region(HD_DATA, 8); | |
776 | out2: | |
777 | free_irq(HD_IRQ, NULL); | |
778 | out1: | |
779 | for (drive = 0; drive < NR_HD; drive++) | |
780 | put_disk(hd_gendisk[drive]); | |
781 | NR_HD = 0; | |
782 | out: | |
783 | del_timer(&device_timer); | |
ddeb9c3e | 784 | unregister_blkdev(HD_MAJOR, "hd"); |
1da177e4 LT |
785 | blk_cleanup_queue(hd_queue); |
786 | return -1; | |
787 | Enomem: | |
788 | while (drive--) | |
789 | put_disk(hd_gendisk[drive]); | |
790 | goto out; | |
791 | } | |
792 | ||
ec29782b PC |
793 | static int __init parse_hd_setup(char *line) |
794 | { | |
1da177e4 LT |
795 | int ints[6]; |
796 | ||
797 | (void) get_options(line, ARRAY_SIZE(ints), ints); | |
798 | hd_setup(NULL, ints); | |
799 | ||
800 | return 1; | |
801 | } | |
802 | __setup("hd=", parse_hd_setup); | |
803 | ||
01c22bfc | 804 | late_initcall(hd_init); |