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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> | |
37 | #include <linux/slab.h> | |
38 | #include <linux/string.h> | |
39 | #include <linux/ioport.h> | |
40 | #include <linux/mc146818rtc.h> /* CMOS defines */ | |
41 | #include <linux/init.h> | |
42 | #include <linux/blkpg.h> | |
43 | #include <linux/hdreg.h> | |
44 | ||
45 | #define REALLY_SLOW_IO | |
46 | #include <asm/system.h> | |
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; | |
99 | ||
100 | #define MAJOR_NR HD_MAJOR | |
101 | #define QUEUE (hd_queue) | |
102 | #define CURRENT elv_next_request(hd_queue) | |
103 | ||
104 | #define TIMEOUT_VALUE (6*HZ) | |
105 | #define HD_DELAY 0 | |
106 | ||
107 | #define MAX_ERRORS 16 /* Max read/write errors/sector */ | |
108 | #define RESET_FREQ 8 /* Reset controller every 8th retry */ | |
109 | #define RECAL_FREQ 4 /* Recalibrate every 4th retry */ | |
110 | #define MAX_HD 2 | |
111 | ||
112 | #define STAT_OK (READY_STAT|SEEK_STAT) | |
113 | #define OK_STATUS(s) (((s)&(STAT_OK|(BUSY_STAT|WRERR_STAT|ERR_STAT)))==STAT_OK) | |
114 | ||
115 | static void recal_intr(void); | |
116 | static void bad_rw_intr(void); | |
117 | ||
118 | static int reset; | |
119 | static int hd_error; | |
120 | ||
121 | /* | |
122 | * This struct defines the HD's and their types. | |
123 | */ | |
124 | struct hd_i_struct { | |
125 | unsigned int head,sect,cyl,wpcom,lzone,ctl; | |
126 | int unit; | |
127 | int recalibrate; | |
128 | int special_op; | |
129 | }; | |
130 | ||
131 | #ifdef HD_TYPE | |
132 | static struct hd_i_struct hd_info[] = { HD_TYPE }; | |
133 | static int NR_HD = ((sizeof (hd_info))/(sizeof (struct hd_i_struct))); | |
134 | #else | |
135 | static struct hd_i_struct hd_info[MAX_HD]; | |
136 | static int NR_HD; | |
137 | #endif | |
138 | ||
139 | static struct gendisk *hd_gendisk[MAX_HD]; | |
140 | ||
141 | static struct timer_list device_timer; | |
142 | ||
143 | #define TIMEOUT_VALUE (6*HZ) | |
144 | ||
145 | #define SET_TIMER \ | |
146 | do { \ | |
147 | mod_timer(&device_timer, jiffies + TIMEOUT_VALUE); \ | |
148 | } while (0) | |
149 | ||
150 | static void (*do_hd)(void) = NULL; | |
151 | #define SET_HANDLER(x) \ | |
152 | if ((do_hd = (x)) != NULL) \ | |
153 | SET_TIMER; \ | |
154 | else \ | |
155 | del_timer(&device_timer); | |
156 | ||
157 | ||
158 | #if (HD_DELAY > 0) | |
306e440d IM |
159 | |
160 | #include <asm/i8253.h> | |
161 | ||
1da177e4 LT |
162 | unsigned long last_req; |
163 | ||
164 | unsigned long read_timer(void) | |
165 | { | |
1da177e4 LT |
166 | unsigned long t, flags; |
167 | int i; | |
168 | ||
169 | spin_lock_irqsave(&i8253_lock, flags); | |
170 | t = jiffies * 11932; | |
171 | outb_p(0, 0x43); | |
172 | i = inb_p(0x40); | |
173 | i |= inb(0x40) << 8; | |
174 | spin_unlock_irqrestore(&i8253_lock, flags); | |
175 | return(t - i); | |
176 | } | |
177 | #endif | |
178 | ||
179 | static void __init hd_setup(char *str, int *ints) | |
180 | { | |
181 | int hdind = 0; | |
182 | ||
183 | if (ints[0] != 3) | |
184 | return; | |
185 | if (hd_info[0].head != 0) | |
186 | hdind=1; | |
187 | hd_info[hdind].head = ints[2]; | |
188 | hd_info[hdind].sect = ints[3]; | |
189 | hd_info[hdind].cyl = ints[1]; | |
190 | hd_info[hdind].wpcom = 0; | |
191 | hd_info[hdind].lzone = ints[1]; | |
192 | hd_info[hdind].ctl = (ints[2] > 8 ? 8 : 0); | |
193 | NR_HD = hdind+1; | |
194 | } | |
195 | ||
196 | static void dump_status (const char *msg, unsigned int stat) | |
197 | { | |
198 | char *name = "hd?"; | |
199 | if (CURRENT) | |
200 | name = CURRENT->rq_disk->disk_name; | |
201 | ||
202 | #ifdef VERBOSE_ERRORS | |
203 | printk("%s: %s: status=0x%02x { ", name, msg, stat & 0xff); | |
204 | if (stat & BUSY_STAT) printk("Busy "); | |
205 | if (stat & READY_STAT) printk("DriveReady "); | |
206 | if (stat & WRERR_STAT) printk("WriteFault "); | |
207 | if (stat & SEEK_STAT) printk("SeekComplete "); | |
208 | if (stat & DRQ_STAT) printk("DataRequest "); | |
209 | if (stat & ECC_STAT) printk("CorrectedError "); | |
210 | if (stat & INDEX_STAT) printk("Index "); | |
211 | if (stat & ERR_STAT) printk("Error "); | |
212 | printk("}\n"); | |
213 | if ((stat & ERR_STAT) == 0) { | |
214 | hd_error = 0; | |
215 | } else { | |
216 | hd_error = inb(HD_ERROR); | |
217 | printk("%s: %s: error=0x%02x { ", name, msg, hd_error & 0xff); | |
218 | if (hd_error & BBD_ERR) printk("BadSector "); | |
219 | if (hd_error & ECC_ERR) printk("UncorrectableError "); | |
220 | if (hd_error & ID_ERR) printk("SectorIdNotFound "); | |
221 | if (hd_error & ABRT_ERR) printk("DriveStatusError "); | |
222 | if (hd_error & TRK0_ERR) printk("TrackZeroNotFound "); | |
223 | if (hd_error & MARK_ERR) printk("AddrMarkNotFound "); | |
224 | printk("}"); | |
225 | if (hd_error & (BBD_ERR|ECC_ERR|ID_ERR|MARK_ERR)) { | |
226 | printk(", CHS=%d/%d/%d", (inb(HD_HCYL)<<8) + inb(HD_LCYL), | |
227 | inb(HD_CURRENT) & 0xf, inb(HD_SECTOR)); | |
228 | if (CURRENT) | |
229 | printk(", sector=%ld", CURRENT->sector); | |
230 | } | |
231 | printk("\n"); | |
232 | } | |
233 | #else | |
234 | printk("%s: %s: status=0x%02x.\n", name, msg, stat & 0xff); | |
235 | if ((stat & ERR_STAT) == 0) { | |
236 | hd_error = 0; | |
237 | } else { | |
238 | hd_error = inb(HD_ERROR); | |
239 | printk("%s: %s: error=0x%02x.\n", name, msg, hd_error & 0xff); | |
240 | } | |
241 | #endif | |
242 | } | |
243 | ||
244 | static void check_status(void) | |
245 | { | |
246 | int i = inb_p(HD_STATUS); | |
247 | ||
248 | if (!OK_STATUS(i)) { | |
249 | dump_status("check_status", i); | |
250 | bad_rw_intr(); | |
251 | } | |
252 | } | |
253 | ||
254 | static int controller_busy(void) | |
255 | { | |
256 | int retries = 100000; | |
257 | unsigned char status; | |
258 | ||
259 | do { | |
260 | status = inb_p(HD_STATUS); | |
261 | } while ((status & BUSY_STAT) && --retries); | |
262 | return status; | |
263 | } | |
264 | ||
265 | static int status_ok(void) | |
266 | { | |
267 | unsigned char status = inb_p(HD_STATUS); | |
268 | ||
269 | if (status & BUSY_STAT) | |
270 | return 1; /* Ancient, but does it make sense??? */ | |
271 | if (status & WRERR_STAT) | |
272 | return 0; | |
273 | if (!(status & READY_STAT)) | |
274 | return 0; | |
275 | if (!(status & SEEK_STAT)) | |
276 | return 0; | |
277 | return 1; | |
278 | } | |
279 | ||
280 | static int controller_ready(unsigned int drive, unsigned int head) | |
281 | { | |
282 | int retry = 100; | |
283 | ||
284 | do { | |
285 | if (controller_busy() & BUSY_STAT) | |
286 | return 0; | |
287 | outb_p(0xA0 | (drive<<4) | head, HD_CURRENT); | |
288 | if (status_ok()) | |
289 | return 1; | |
290 | } while (--retry); | |
291 | return 0; | |
292 | } | |
293 | ||
294 | ||
295 | static void hd_out(struct hd_i_struct *disk, | |
296 | unsigned int nsect, | |
297 | unsigned int sect, | |
298 | unsigned int head, | |
299 | unsigned int cyl, | |
300 | unsigned int cmd, | |
301 | void (*intr_addr)(void)) | |
302 | { | |
303 | unsigned short port; | |
304 | ||
305 | #if (HD_DELAY > 0) | |
306 | while (read_timer() - last_req < HD_DELAY) | |
307 | /* nothing */; | |
308 | #endif | |
309 | if (reset) | |
310 | return; | |
311 | if (!controller_ready(disk->unit, head)) { | |
312 | reset = 1; | |
313 | return; | |
314 | } | |
315 | SET_HANDLER(intr_addr); | |
316 | outb_p(disk->ctl,HD_CMD); | |
317 | port=HD_DATA; | |
318 | outb_p(disk->wpcom>>2,++port); | |
319 | outb_p(nsect,++port); | |
320 | outb_p(sect,++port); | |
321 | outb_p(cyl,++port); | |
322 | outb_p(cyl>>8,++port); | |
323 | outb_p(0xA0|(disk->unit<<4)|head,++port); | |
324 | outb_p(cmd,++port); | |
325 | } | |
326 | ||
327 | static void hd_request (void); | |
328 | ||
329 | static int drive_busy(void) | |
330 | { | |
331 | unsigned int i; | |
332 | unsigned char c; | |
333 | ||
334 | for (i = 0; i < 500000 ; i++) { | |
335 | c = inb_p(HD_STATUS); | |
336 | if ((c & (BUSY_STAT | READY_STAT | SEEK_STAT)) == STAT_OK) | |
337 | return 0; | |
338 | } | |
339 | dump_status("reset timed out", c); | |
340 | return 1; | |
341 | } | |
342 | ||
343 | static void reset_controller(void) | |
344 | { | |
345 | int i; | |
346 | ||
347 | outb_p(4,HD_CMD); | |
348 | for(i = 0; i < 1000; i++) barrier(); | |
349 | outb_p(hd_info[0].ctl & 0x0f,HD_CMD); | |
350 | for(i = 0; i < 1000; i++) barrier(); | |
351 | if (drive_busy()) | |
352 | printk("hd: controller still busy\n"); | |
353 | else if ((hd_error = inb(HD_ERROR)) != 1) | |
354 | printk("hd: controller reset failed: %02x\n",hd_error); | |
355 | } | |
356 | ||
357 | static void reset_hd(void) | |
358 | { | |
359 | static int i; | |
360 | ||
361 | repeat: | |
362 | if (reset) { | |
363 | reset = 0; | |
364 | i = -1; | |
365 | reset_controller(); | |
366 | } else { | |
367 | check_status(); | |
368 | if (reset) | |
369 | goto repeat; | |
370 | } | |
371 | if (++i < NR_HD) { | |
372 | struct hd_i_struct *disk = &hd_info[i]; | |
373 | disk->special_op = disk->recalibrate = 1; | |
374 | hd_out(disk,disk->sect,disk->sect,disk->head-1, | |
375 | disk->cyl,WIN_SPECIFY,&reset_hd); | |
376 | if (reset) | |
377 | goto repeat; | |
378 | } else | |
379 | hd_request(); | |
380 | } | |
381 | ||
382 | /* | |
383 | * Ok, don't know what to do with the unexpected interrupts: on some machines | |
384 | * doing a reset and a retry seems to result in an eternal loop. Right now I | |
385 | * ignore it, and just set the timeout. | |
386 | * | |
387 | * On laptops (and "green" PCs), an unexpected interrupt occurs whenever the | |
388 | * drive enters "idle", "standby", or "sleep" mode, so if the status looks | |
389 | * "good", we just ignore the interrupt completely. | |
390 | */ | |
391 | static void unexpected_hd_interrupt(void) | |
392 | { | |
393 | unsigned int stat = inb_p(HD_STATUS); | |
394 | ||
395 | if (stat & (BUSY_STAT|DRQ_STAT|ECC_STAT|ERR_STAT)) { | |
396 | dump_status ("unexpected interrupt", stat); | |
397 | SET_TIMER; | |
398 | } | |
399 | } | |
400 | ||
401 | /* | |
402 | * bad_rw_intr() now tries to be a bit smarter and does things | |
403 | * according to the error returned by the controller. | |
404 | * -Mika Liljeberg (liljeber@cs.Helsinki.FI) | |
405 | */ | |
406 | static void bad_rw_intr(void) | |
407 | { | |
408 | struct request *req = CURRENT; | |
409 | if (req != NULL) { | |
410 | struct hd_i_struct *disk = req->rq_disk->private_data; | |
411 | if (++req->errors >= MAX_ERRORS || (hd_error & BBD_ERR)) { | |
412 | end_request(req, 0); | |
413 | disk->special_op = disk->recalibrate = 1; | |
414 | } else if (req->errors % RESET_FREQ == 0) | |
415 | reset = 1; | |
416 | else if ((hd_error & TRK0_ERR) || req->errors % RECAL_FREQ == 0) | |
417 | disk->special_op = disk->recalibrate = 1; | |
418 | /* Otherwise just retry */ | |
419 | } | |
420 | } | |
421 | ||
422 | static inline int wait_DRQ(void) | |
423 | { | |
424 | int retries = 100000, stat; | |
425 | ||
426 | while (--retries > 0) | |
427 | if ((stat = inb_p(HD_STATUS)) & DRQ_STAT) | |
428 | return 0; | |
429 | dump_status("wait_DRQ", stat); | |
430 | return -1; | |
431 | } | |
432 | ||
433 | static void read_intr(void) | |
434 | { | |
435 | struct request *req; | |
436 | int i, retries = 100000; | |
437 | ||
438 | do { | |
439 | i = (unsigned) inb_p(HD_STATUS); | |
440 | if (i & BUSY_STAT) | |
441 | continue; | |
442 | if (!OK_STATUS(i)) | |
443 | break; | |
444 | if (i & DRQ_STAT) | |
445 | goto ok_to_read; | |
446 | } while (--retries > 0); | |
447 | dump_status("read_intr", i); | |
448 | bad_rw_intr(); | |
449 | hd_request(); | |
450 | return; | |
451 | ok_to_read: | |
452 | req = CURRENT; | |
453 | insw(HD_DATA,req->buffer,256); | |
454 | req->sector++; | |
455 | req->buffer += 512; | |
456 | req->errors = 0; | |
457 | i = --req->nr_sectors; | |
458 | --req->current_nr_sectors; | |
459 | #ifdef DEBUG | |
460 | printk("%s: read: sector %ld, remaining = %ld, buffer=%p\n", | |
461 | req->rq_disk->disk_name, req->sector, req->nr_sectors, | |
462 | req->buffer+512)); | |
463 | #endif | |
464 | if (req->current_nr_sectors <= 0) | |
465 | end_request(req, 1); | |
466 | if (i > 0) { | |
467 | SET_HANDLER(&read_intr); | |
468 | return; | |
469 | } | |
470 | (void) inb_p(HD_STATUS); | |
471 | #if (HD_DELAY > 0) | |
472 | last_req = read_timer(); | |
473 | #endif | |
474 | if (elv_next_request(QUEUE)) | |
475 | hd_request(); | |
476 | return; | |
477 | } | |
478 | ||
479 | static void write_intr(void) | |
480 | { | |
481 | struct request *req = CURRENT; | |
482 | int i; | |
483 | int retries = 100000; | |
484 | ||
485 | do { | |
486 | i = (unsigned) inb_p(HD_STATUS); | |
487 | if (i & BUSY_STAT) | |
488 | continue; | |
489 | if (!OK_STATUS(i)) | |
490 | break; | |
491 | if ((req->nr_sectors <= 1) || (i & DRQ_STAT)) | |
492 | goto ok_to_write; | |
493 | } while (--retries > 0); | |
494 | dump_status("write_intr", i); | |
495 | bad_rw_intr(); | |
496 | hd_request(); | |
497 | return; | |
498 | ok_to_write: | |
499 | req->sector++; | |
500 | i = --req->nr_sectors; | |
501 | --req->current_nr_sectors; | |
502 | req->buffer += 512; | |
503 | if (!i || (req->bio && req->current_nr_sectors <= 0)) | |
504 | end_request(req, 1); | |
505 | if (i > 0) { | |
506 | SET_HANDLER(&write_intr); | |
507 | outsw(HD_DATA,req->buffer,256); | |
508 | local_irq_enable(); | |
509 | } else { | |
510 | #if (HD_DELAY > 0) | |
511 | last_req = read_timer(); | |
512 | #endif | |
513 | hd_request(); | |
514 | } | |
515 | return; | |
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 | ||
537 | if (!CURRENT) | |
538 | return; | |
539 | ||
540 | disable_irq(HD_IRQ); | |
541 | local_irq_enable(); | |
542 | reset = 1; | |
543 | name = CURRENT->rq_disk->disk_name; | |
544 | printk("%s: timeout\n", name); | |
545 | if (++CURRENT->errors >= MAX_ERRORS) { | |
546 | #ifdef DEBUG | |
547 | printk("%s: too many errors\n", name); | |
548 | #endif | |
549 | end_request(CURRENT, 0); | |
550 | } | |
551 | local_irq_disable(); | |
552 | hd_request(); | |
553 | enable_irq(HD_IRQ); | |
554 | } | |
555 | ||
556 | static int do_special_op(struct hd_i_struct *disk, struct request *req) | |
557 | { | |
558 | if (disk->recalibrate) { | |
559 | disk->recalibrate = 0; | |
560 | hd_out(disk,disk->sect,0,0,0,WIN_RESTORE,&recal_intr); | |
561 | return reset; | |
562 | } | |
563 | if (disk->head > 16) { | |
564 | printk ("%s: cannot handle device with more than 16 heads - giving up\n", req->rq_disk->disk_name); | |
565 | end_request(req, 0); | |
566 | } | |
567 | disk->special_op = 0; | |
568 | return 1; | |
569 | } | |
570 | ||
571 | /* | |
572 | * The driver enables interrupts as much as possible. In order to do this, | |
573 | * (a) the device-interrupt is disabled before entering hd_request(), | |
574 | * and (b) the timeout-interrupt is disabled before the sti(). | |
575 | * | |
576 | * Interrupts are still masked (by default) whenever we are exchanging | |
577 | * data/cmds with a drive, because some drives seem to have very poor | |
578 | * tolerance for latency during I/O. The IDE driver has support to unmask | |
579 | * interrupts for non-broken hardware, so use that driver if required. | |
580 | */ | |
581 | static void hd_request(void) | |
582 | { | |
583 | unsigned int block, nsect, sec, track, head, cyl; | |
584 | struct hd_i_struct *disk; | |
585 | struct request *req; | |
586 | ||
587 | if (do_hd) | |
588 | return; | |
589 | repeat: | |
590 | del_timer(&device_timer); | |
591 | local_irq_enable(); | |
592 | ||
593 | req = CURRENT; | |
594 | if (!req) { | |
595 | do_hd = NULL; | |
596 | return; | |
597 | } | |
598 | ||
599 | if (reset) { | |
600 | local_irq_disable(); | |
601 | reset_hd(); | |
602 | return; | |
603 | } | |
604 | disk = req->rq_disk->private_data; | |
605 | block = req->sector; | |
606 | nsect = req->nr_sectors; | |
607 | if (block >= get_capacity(req->rq_disk) || | |
608 | ((block+nsect) > get_capacity(req->rq_disk))) { | |
609 | printk("%s: bad access: block=%d, count=%d\n", | |
610 | req->rq_disk->disk_name, block, nsect); | |
611 | end_request(req, 0); | |
612 | goto repeat; | |
613 | } | |
614 | ||
615 | if (disk->special_op) { | |
616 | if (do_special_op(disk, req)) | |
617 | goto repeat; | |
618 | return; | |
619 | } | |
620 | sec = block % disk->sect + 1; | |
621 | track = block / disk->sect; | |
622 | head = track % disk->head; | |
623 | cyl = track / disk->head; | |
624 | #ifdef DEBUG | |
625 | printk("%s: %sing: CHS=%d/%d/%d, sectors=%d, buffer=%p\n", | |
626 | req->rq_disk->disk_name, (req->cmd == READ)?"read":"writ", | |
627 | cyl, head, sec, nsect, req->buffer); | |
628 | #endif | |
629 | if (req->flags & REQ_CMD) { | |
630 | switch (rq_data_dir(req)) { | |
631 | case READ: | |
632 | hd_out(disk,nsect,sec,head,cyl,WIN_READ,&read_intr); | |
633 | if (reset) | |
634 | goto repeat; | |
635 | break; | |
636 | case WRITE: | |
637 | hd_out(disk,nsect,sec,head,cyl,WIN_WRITE,&write_intr); | |
638 | if (reset) | |
639 | goto repeat; | |
640 | if (wait_DRQ()) { | |
641 | bad_rw_intr(); | |
642 | goto repeat; | |
643 | } | |
644 | outsw(HD_DATA,req->buffer,256); | |
645 | break; | |
646 | default: | |
647 | printk("unknown hd-command\n"); | |
648 | end_request(req, 0); | |
649 | break; | |
650 | } | |
651 | } | |
652 | } | |
653 | ||
654 | static void do_hd_request (request_queue_t * q) | |
655 | { | |
656 | disable_irq(HD_IRQ); | |
657 | hd_request(); | |
658 | enable_irq(HD_IRQ); | |
659 | } | |
660 | ||
661 | static int hd_ioctl(struct inode * inode, struct file * file, | |
662 | unsigned int cmd, unsigned long arg) | |
663 | { | |
664 | struct hd_i_struct *disk = inode->i_bdev->bd_disk->private_data; | |
665 | struct hd_geometry __user *loc = (struct hd_geometry __user *) arg; | |
666 | struct hd_geometry g; | |
667 | ||
668 | if (cmd != HDIO_GETGEO) | |
669 | return -EINVAL; | |
670 | if (!loc) | |
671 | return -EINVAL; | |
672 | g.heads = disk->head; | |
673 | g.sectors = disk->sect; | |
674 | g.cylinders = disk->cyl; | |
675 | g.start = get_start_sect(inode->i_bdev); | |
676 | return copy_to_user(loc, &g, sizeof g) ? -EFAULT : 0; | |
677 | } | |
678 | ||
679 | /* | |
680 | * Releasing a block device means we sync() it, so that it can safely | |
681 | * be forgotten about... | |
682 | */ | |
683 | ||
684 | static irqreturn_t hd_interrupt(int irq, void *dev_id, struct pt_regs *regs) | |
685 | { | |
686 | void (*handler)(void) = do_hd; | |
687 | ||
688 | do_hd = NULL; | |
689 | del_timer(&device_timer); | |
690 | if (!handler) | |
691 | handler = unexpected_hd_interrupt; | |
692 | handler(); | |
693 | local_irq_enable(); | |
694 | return IRQ_HANDLED; | |
695 | } | |
696 | ||
697 | static struct block_device_operations hd_fops = { | |
698 | .ioctl = hd_ioctl, | |
699 | }; | |
700 | ||
701 | /* | |
702 | * This is the hard disk IRQ description. The SA_INTERRUPT in sa_flags | |
703 | * means we run the IRQ-handler with interrupts disabled: this is bad for | |
704 | * interrupt latency, but anything else has led to problems on some | |
705 | * machines. | |
706 | * | |
707 | * We enable interrupts in some of the routines after making sure it's | |
708 | * safe. | |
709 | */ | |
710 | ||
711 | static int __init hd_init(void) | |
712 | { | |
713 | int drive; | |
714 | ||
715 | if (register_blkdev(MAJOR_NR,"hd")) | |
716 | return -1; | |
717 | ||
718 | hd_queue = blk_init_queue(do_hd_request, &hd_lock); | |
719 | if (!hd_queue) { | |
720 | unregister_blkdev(MAJOR_NR,"hd"); | |
721 | return -ENOMEM; | |
722 | } | |
723 | ||
724 | blk_queue_max_sectors(hd_queue, 255); | |
725 | init_timer(&device_timer); | |
726 | device_timer.function = hd_times_out; | |
727 | blk_queue_hardsect_size(hd_queue, 512); | |
728 | ||
729 | #ifdef __i386__ | |
730 | if (!NR_HD) { | |
731 | extern struct drive_info drive_info; | |
732 | unsigned char *BIOS = (unsigned char *) &drive_info; | |
733 | unsigned long flags; | |
734 | int cmos_disks; | |
735 | ||
736 | for (drive=0 ; drive<2 ; drive++) { | |
737 | hd_info[drive].cyl = *(unsigned short *) BIOS; | |
738 | hd_info[drive].head = *(2+BIOS); | |
739 | hd_info[drive].wpcom = *(unsigned short *) (5+BIOS); | |
740 | hd_info[drive].ctl = *(8+BIOS); | |
741 | hd_info[drive].lzone = *(unsigned short *) (12+BIOS); | |
742 | hd_info[drive].sect = *(14+BIOS); | |
743 | #ifdef does_not_work_for_everybody_with_scsi_but_helps_ibm_vp | |
744 | if (hd_info[drive].cyl && NR_HD == drive) | |
745 | NR_HD++; | |
746 | #endif | |
747 | BIOS += 16; | |
748 | } | |
749 | ||
750 | /* | |
751 | We query CMOS about hard disks : it could be that | |
752 | we have a SCSI/ESDI/etc controller that is BIOS | |
753 | compatible with ST-506, and thus showing up in our | |
754 | BIOS table, but not register compatible, and therefore | |
755 | not present in CMOS. | |
756 | ||
757 | Furthermore, we will assume that our ST-506 drives | |
758 | <if any> are the primary drives in the system, and | |
759 | the ones reflected as drive 1 or 2. | |
760 | ||
761 | The first drive is stored in the high nibble of CMOS | |
762 | byte 0x12, the second in the low nibble. This will be | |
763 | either a 4 bit drive type or 0xf indicating use byte 0x19 | |
764 | for an 8 bit type, drive 1, 0x1a for drive 2 in CMOS. | |
765 | ||
766 | Needless to say, a non-zero value means we have | |
767 | an AT controller hard disk for that drive. | |
768 | ||
769 | Currently the rtc_lock is a bit academic since this | |
770 | driver is non-modular, but someday... ? Paul G. | |
771 | */ | |
772 | ||
773 | spin_lock_irqsave(&rtc_lock, flags); | |
774 | cmos_disks = CMOS_READ(0x12); | |
775 | spin_unlock_irqrestore(&rtc_lock, flags); | |
776 | ||
777 | if (cmos_disks & 0xf0) { | |
778 | if (cmos_disks & 0x0f) | |
779 | NR_HD = 2; | |
780 | else | |
781 | NR_HD = 1; | |
782 | } | |
783 | } | |
784 | #endif /* __i386__ */ | |
785 | #ifdef __arm__ | |
786 | if (!NR_HD) { | |
787 | /* We don't know anything about the drive. This means | |
788 | * that you *MUST* specify the drive parameters to the | |
789 | * kernel yourself. | |
790 | */ | |
791 | printk("hd: no drives specified - use hd=cyl,head,sectors" | |
792 | " on kernel command line\n"); | |
793 | } | |
794 | #endif | |
795 | if (!NR_HD) | |
796 | goto out; | |
797 | ||
798 | for (drive=0 ; drive < NR_HD ; drive++) { | |
799 | struct gendisk *disk = alloc_disk(64); | |
800 | struct hd_i_struct *p = &hd_info[drive]; | |
801 | if (!disk) | |
802 | goto Enomem; | |
803 | disk->major = MAJOR_NR; | |
804 | disk->first_minor = drive << 6; | |
805 | disk->fops = &hd_fops; | |
806 | sprintf(disk->disk_name, "hd%c", 'a'+drive); | |
807 | disk->private_data = p; | |
808 | set_capacity(disk, p->head * p->sect * p->cyl); | |
809 | disk->queue = hd_queue; | |
810 | p->unit = drive; | |
811 | hd_gendisk[drive] = disk; | |
812 | printk ("%s: %luMB, CHS=%d/%d/%d\n", | |
813 | disk->disk_name, (unsigned long)get_capacity(disk)/2048, | |
814 | p->cyl, p->head, p->sect); | |
815 | } | |
816 | ||
817 | if (request_irq(HD_IRQ, hd_interrupt, SA_INTERRUPT, "hd", NULL)) { | |
818 | printk("hd: unable to get IRQ%d for the hard disk driver\n", | |
819 | HD_IRQ); | |
820 | goto out1; | |
821 | } | |
822 | if (!request_region(HD_DATA, 8, "hd")) { | |
823 | printk(KERN_WARNING "hd: port 0x%x busy\n", HD_DATA); | |
824 | goto out2; | |
825 | } | |
826 | if (!request_region(HD_CMD, 1, "hd(cmd)")) { | |
827 | printk(KERN_WARNING "hd: port 0x%x busy\n", HD_CMD); | |
828 | goto out3; | |
829 | } | |
830 | ||
831 | /* Let them fly */ | |
832 | for(drive=0; drive < NR_HD; drive++) | |
833 | add_disk(hd_gendisk[drive]); | |
834 | ||
835 | return 0; | |
836 | ||
837 | out3: | |
838 | release_region(HD_DATA, 8); | |
839 | out2: | |
840 | free_irq(HD_IRQ, NULL); | |
841 | out1: | |
842 | for (drive = 0; drive < NR_HD; drive++) | |
843 | put_disk(hd_gendisk[drive]); | |
844 | NR_HD = 0; | |
845 | out: | |
846 | del_timer(&device_timer); | |
847 | unregister_blkdev(MAJOR_NR,"hd"); | |
848 | blk_cleanup_queue(hd_queue); | |
849 | return -1; | |
850 | Enomem: | |
851 | while (drive--) | |
852 | put_disk(hd_gendisk[drive]); | |
853 | goto out; | |
854 | } | |
855 | ||
fca44804 | 856 | static int __init parse_hd_setup (char *line) { |
1da177e4 LT |
857 | int ints[6]; |
858 | ||
859 | (void) get_options(line, ARRAY_SIZE(ints), ints); | |
860 | hd_setup(NULL, ints); | |
861 | ||
862 | return 1; | |
863 | } | |
864 | __setup("hd=", parse_hd_setup); | |
865 | ||
866 | module_init(hd_init); |