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> | |
37 | #include <linux/slab.h> | |
38 | #include <linux/string.h> | |
39 | #include <linux/ioport.h> | |
1da177e4 LT |
40 | #include <linux/init.h> |
41 | #include <linux/blkpg.h> | |
f26b3d75 | 42 | #include <linux/ata.h> |
1da177e4 LT |
43 | #include <linux/hdreg.h> |
44 | ||
4fe6e306 BZ |
45 | #define HD_IRQ 14 |
46 | ||
1da177e4 LT |
47 | #define REALLY_SLOW_IO |
48 | #include <asm/system.h> | |
49 | #include <asm/io.h> | |
50 | #include <asm/uaccess.h> | |
51 | ||
52 | #ifdef __arm__ | |
53 | #undef HD_IRQ | |
54 | #endif | |
55 | #include <asm/irq.h> | |
56 | #ifdef __arm__ | |
57 | #define HD_IRQ IRQ_HARDDISK | |
58 | #endif | |
59 | ||
60 | /* Hd controller regster ports */ | |
61 | ||
62 | #define HD_DATA 0x1f0 /* _CTL when writing */ | |
63 | #define HD_ERROR 0x1f1 /* see err-bits */ | |
64 | #define HD_NSECTOR 0x1f2 /* nr of sectors to read/write */ | |
65 | #define HD_SECTOR 0x1f3 /* starting sector */ | |
66 | #define HD_LCYL 0x1f4 /* starting cylinder */ | |
67 | #define HD_HCYL 0x1f5 /* high byte of starting cyl */ | |
68 | #define HD_CURRENT 0x1f6 /* 101dhhhh , d=drive, hhhh=head */ | |
69 | #define HD_STATUS 0x1f7 /* see status-bits */ | |
70 | #define HD_FEATURE HD_ERROR /* same io address, read=error, write=feature */ | |
71 | #define HD_PRECOMP HD_FEATURE /* obsolete use of this port - predates IDE */ | |
72 | #define HD_COMMAND HD_STATUS /* same io address, read=status, write=cmd */ | |
73 | ||
74 | #define HD_CMD 0x3f6 /* used for resets */ | |
75 | #define HD_ALTSTATUS 0x3f6 /* same as HD_STATUS but doesn't clear irq */ | |
76 | ||
77 | /* Bits of HD_STATUS */ | |
78 | #define ERR_STAT 0x01 | |
79 | #define INDEX_STAT 0x02 | |
80 | #define ECC_STAT 0x04 /* Corrected error */ | |
81 | #define DRQ_STAT 0x08 | |
82 | #define SEEK_STAT 0x10 | |
83 | #define SERVICE_STAT SEEK_STAT | |
84 | #define WRERR_STAT 0x20 | |
85 | #define READY_STAT 0x40 | |
86 | #define BUSY_STAT 0x80 | |
87 | ||
88 | /* Bits for HD_ERROR */ | |
89 | #define MARK_ERR 0x01 /* Bad address mark */ | |
90 | #define TRK0_ERR 0x02 /* couldn't find track 0 */ | |
91 | #define ABRT_ERR 0x04 /* Command aborted */ | |
92 | #define MCR_ERR 0x08 /* media change request */ | |
93 | #define ID_ERR 0x10 /* ID field not found */ | |
94 | #define MC_ERR 0x20 /* media changed */ | |
95 | #define ECC_ERR 0x40 /* Uncorrectable ECC error */ | |
96 | #define BBD_ERR 0x80 /* pre-EIDE meaning: block marked bad */ | |
97 | #define ICRC_ERR 0x80 /* new meaning: CRC error during transfer */ | |
98 | ||
99 | static DEFINE_SPINLOCK(hd_lock); | |
100 | static struct request_queue *hd_queue; | |
8a12c4a4 | 101 | static struct request *hd_req; |
1da177e4 | 102 | |
1da177e4 LT |
103 | #define TIMEOUT_VALUE (6*HZ) |
104 | #define HD_DELAY 0 | |
105 | ||
106 | #define MAX_ERRORS 16 /* Max read/write errors/sector */ | |
107 | #define RESET_FREQ 8 /* Reset controller every 8th retry */ | |
108 | #define RECAL_FREQ 4 /* Recalibrate every 4th retry */ | |
109 | #define MAX_HD 2 | |
110 | ||
111 | #define STAT_OK (READY_STAT|SEEK_STAT) | |
112 | #define OK_STATUS(s) (((s)&(STAT_OK|(BUSY_STAT|WRERR_STAT|ERR_STAT)))==STAT_OK) | |
113 | ||
114 | static void recal_intr(void); | |
115 | static void bad_rw_intr(void); | |
116 | ||
117 | static int reset; | |
118 | static int hd_error; | |
119 | ||
120 | /* | |
121 | * This struct defines the HD's and their types. | |
122 | */ | |
123 | struct hd_i_struct { | |
ec29782b | 124 | unsigned int head, sect, cyl, wpcom, lzone, ctl; |
1da177e4 LT |
125 | int unit; |
126 | int recalibrate; | |
127 | int special_op; | |
128 | }; | |
ec29782b | 129 | |
1da177e4 LT |
130 | #ifdef HD_TYPE |
131 | static struct hd_i_struct hd_info[] = { HD_TYPE }; | |
ecea5730 | 132 | static int NR_HD = ARRAY_SIZE(hd_info); |
1da177e4 LT |
133 | #else |
134 | static struct hd_i_struct hd_info[MAX_HD]; | |
135 | static int NR_HD; | |
136 | #endif | |
137 | ||
138 | static struct gendisk *hd_gendisk[MAX_HD]; | |
139 | ||
140 | static struct timer_list device_timer; | |
141 | ||
142 | #define TIMEOUT_VALUE (6*HZ) | |
143 | ||
144 | #define SET_TIMER \ | |
145 | do { \ | |
146 | mod_timer(&device_timer, jiffies + TIMEOUT_VALUE); \ | |
147 | } while (0) | |
148 | ||
149 | static void (*do_hd)(void) = NULL; | |
150 | #define SET_HANDLER(x) \ | |
151 | if ((do_hd = (x)) != NULL) \ | |
152 | SET_TIMER; \ | |
153 | else \ | |
154 | del_timer(&device_timer); | |
155 | ||
156 | ||
157 | #if (HD_DELAY > 0) | |
306e440d IM |
158 | |
159 | #include <asm/i8253.h> | |
160 | ||
1da177e4 LT |
161 | unsigned long last_req; |
162 | ||
163 | unsigned long read_timer(void) | |
164 | { | |
1da177e4 LT |
165 | unsigned long t, flags; |
166 | int i; | |
167 | ||
168 | spin_lock_irqsave(&i8253_lock, flags); | |
169 | t = jiffies * 11932; | |
ec29782b | 170 | outb_p(0, 0x43); |
1da177e4 LT |
171 | i = inb_p(0x40); |
172 | i |= inb(0x40) << 8; | |
173 | spin_unlock_irqrestore(&i8253_lock, flags); | |
174 | return(t - i); | |
175 | } | |
176 | #endif | |
177 | ||
178 | static void __init hd_setup(char *str, int *ints) | |
179 | { | |
180 | int hdind = 0; | |
181 | ||
182 | if (ints[0] != 3) | |
183 | return; | |
184 | if (hd_info[0].head != 0) | |
ec29782b | 185 | hdind = 1; |
1da177e4 LT |
186 | hd_info[hdind].head = ints[2]; |
187 | hd_info[hdind].sect = ints[3]; | |
188 | hd_info[hdind].cyl = ints[1]; | |
189 | hd_info[hdind].wpcom = 0; | |
190 | hd_info[hdind].lzone = ints[1]; | |
191 | hd_info[hdind].ctl = (ints[2] > 8 ? 8 : 0); | |
192 | NR_HD = hdind+1; | |
193 | } | |
194 | ||
8a12c4a4 TH |
195 | static bool hd_end_request(int err, unsigned int bytes) |
196 | { | |
197 | if (__blk_end_request(hd_req, err, bytes)) | |
198 | return true; | |
199 | hd_req = NULL; | |
200 | return false; | |
201 | } | |
202 | ||
203 | static bool hd_end_request_cur(int err) | |
204 | { | |
205 | return hd_end_request(err, blk_rq_cur_bytes(hd_req)); | |
206 | } | |
207 | ||
ec29782b | 208 | static void dump_status(const char *msg, unsigned int stat) |
1da177e4 LT |
209 | { |
210 | char *name = "hd?"; | |
8a12c4a4 TH |
211 | if (hd_req) |
212 | name = hd_req->rq_disk->disk_name; | |
1da177e4 LT |
213 | |
214 | #ifdef VERBOSE_ERRORS | |
215 | printk("%s: %s: status=0x%02x { ", name, msg, stat & 0xff); | |
216 | if (stat & BUSY_STAT) printk("Busy "); | |
217 | if (stat & READY_STAT) printk("DriveReady "); | |
218 | if (stat & WRERR_STAT) printk("WriteFault "); | |
219 | if (stat & SEEK_STAT) printk("SeekComplete "); | |
220 | if (stat & DRQ_STAT) printk("DataRequest "); | |
221 | if (stat & ECC_STAT) printk("CorrectedError "); | |
222 | if (stat & INDEX_STAT) printk("Index "); | |
223 | if (stat & ERR_STAT) printk("Error "); | |
224 | printk("}\n"); | |
225 | if ((stat & ERR_STAT) == 0) { | |
226 | hd_error = 0; | |
227 | } else { | |
228 | hd_error = inb(HD_ERROR); | |
229 | printk("%s: %s: error=0x%02x { ", name, msg, hd_error & 0xff); | |
230 | if (hd_error & BBD_ERR) printk("BadSector "); | |
231 | if (hd_error & ECC_ERR) printk("UncorrectableError "); | |
232 | if (hd_error & ID_ERR) printk("SectorIdNotFound "); | |
233 | if (hd_error & ABRT_ERR) printk("DriveStatusError "); | |
234 | if (hd_error & TRK0_ERR) printk("TrackZeroNotFound "); | |
235 | if (hd_error & MARK_ERR) printk("AddrMarkNotFound "); | |
236 | printk("}"); | |
237 | if (hd_error & (BBD_ERR|ECC_ERR|ID_ERR|MARK_ERR)) { | |
238 | printk(", CHS=%d/%d/%d", (inb(HD_HCYL)<<8) + inb(HD_LCYL), | |
239 | inb(HD_CURRENT) & 0xf, inb(HD_SECTOR)); | |
8a12c4a4 TH |
240 | if (hd_req) |
241 | printk(", sector=%ld", blk_rq_pos(hd_req)); | |
1da177e4 LT |
242 | } |
243 | printk("\n"); | |
244 | } | |
245 | #else | |
246 | printk("%s: %s: status=0x%02x.\n", name, msg, stat & 0xff); | |
247 | if ((stat & ERR_STAT) == 0) { | |
248 | hd_error = 0; | |
249 | } else { | |
250 | hd_error = inb(HD_ERROR); | |
251 | printk("%s: %s: error=0x%02x.\n", name, msg, hd_error & 0xff); | |
252 | } | |
253 | #endif | |
254 | } | |
255 | ||
256 | static void check_status(void) | |
257 | { | |
258 | int i = inb_p(HD_STATUS); | |
259 | ||
260 | if (!OK_STATUS(i)) { | |
261 | dump_status("check_status", i); | |
262 | bad_rw_intr(); | |
263 | } | |
264 | } | |
265 | ||
266 | static int controller_busy(void) | |
267 | { | |
268 | int retries = 100000; | |
269 | unsigned char status; | |
270 | ||
271 | do { | |
272 | status = inb_p(HD_STATUS); | |
273 | } while ((status & BUSY_STAT) && --retries); | |
274 | return status; | |
275 | } | |
276 | ||
277 | static int status_ok(void) | |
278 | { | |
279 | unsigned char status = inb_p(HD_STATUS); | |
280 | ||
281 | if (status & BUSY_STAT) | |
282 | return 1; /* Ancient, but does it make sense??? */ | |
283 | if (status & WRERR_STAT) | |
284 | return 0; | |
285 | if (!(status & READY_STAT)) | |
286 | return 0; | |
287 | if (!(status & SEEK_STAT)) | |
288 | return 0; | |
289 | return 1; | |
290 | } | |
291 | ||
292 | static int controller_ready(unsigned int drive, unsigned int head) | |
293 | { | |
294 | int retry = 100; | |
295 | ||
296 | do { | |
297 | if (controller_busy() & BUSY_STAT) | |
298 | return 0; | |
299 | outb_p(0xA0 | (drive<<4) | head, HD_CURRENT); | |
300 | if (status_ok()) | |
301 | return 1; | |
302 | } while (--retry); | |
303 | return 0; | |
304 | } | |
305 | ||
1da177e4 LT |
306 | static void hd_out(struct hd_i_struct *disk, |
307 | unsigned int nsect, | |
308 | unsigned int sect, | |
309 | unsigned int head, | |
310 | unsigned int cyl, | |
311 | unsigned int cmd, | |
312 | void (*intr_addr)(void)) | |
313 | { | |
314 | unsigned short port; | |
315 | ||
316 | #if (HD_DELAY > 0) | |
317 | while (read_timer() - last_req < HD_DELAY) | |
318 | /* nothing */; | |
319 | #endif | |
320 | if (reset) | |
321 | return; | |
322 | if (!controller_ready(disk->unit, head)) { | |
323 | reset = 1; | |
324 | return; | |
325 | } | |
326 | SET_HANDLER(intr_addr); | |
ec29782b PC |
327 | outb_p(disk->ctl, HD_CMD); |
328 | port = HD_DATA; | |
329 | outb_p(disk->wpcom >> 2, ++port); | |
330 | outb_p(nsect, ++port); | |
331 | outb_p(sect, ++port); | |
332 | outb_p(cyl, ++port); | |
333 | outb_p(cyl >> 8, ++port); | |
334 | outb_p(0xA0 | (disk->unit << 4) | head, ++port); | |
335 | outb_p(cmd, ++port); | |
1da177e4 LT |
336 | } |
337 | ||
338 | static void hd_request (void); | |
339 | ||
340 | static int drive_busy(void) | |
341 | { | |
342 | unsigned int i; | |
343 | unsigned char c; | |
344 | ||
345 | for (i = 0; i < 500000 ; i++) { | |
346 | c = inb_p(HD_STATUS); | |
347 | if ((c & (BUSY_STAT | READY_STAT | SEEK_STAT)) == STAT_OK) | |
348 | return 0; | |
349 | } | |
350 | dump_status("reset timed out", c); | |
351 | return 1; | |
352 | } | |
353 | ||
354 | static void reset_controller(void) | |
355 | { | |
356 | int i; | |
357 | ||
ec29782b PC |
358 | outb_p(4, HD_CMD); |
359 | for (i = 0; i < 1000; i++) barrier(); | |
360 | outb_p(hd_info[0].ctl & 0x0f, HD_CMD); | |
361 | for (i = 0; i < 1000; i++) barrier(); | |
1da177e4 LT |
362 | if (drive_busy()) |
363 | printk("hd: controller still busy\n"); | |
364 | else if ((hd_error = inb(HD_ERROR)) != 1) | |
ec29782b | 365 | printk("hd: controller reset failed: %02x\n", hd_error); |
1da177e4 LT |
366 | } |
367 | ||
368 | static void reset_hd(void) | |
369 | { | |
370 | static int i; | |
371 | ||
372 | repeat: | |
373 | if (reset) { | |
374 | reset = 0; | |
375 | i = -1; | |
376 | reset_controller(); | |
377 | } else { | |
378 | check_status(); | |
379 | if (reset) | |
380 | goto repeat; | |
381 | } | |
382 | if (++i < NR_HD) { | |
383 | struct hd_i_struct *disk = &hd_info[i]; | |
384 | disk->special_op = disk->recalibrate = 1; | |
ec29782b | 385 | hd_out(disk, disk->sect, disk->sect, disk->head-1, |
f26b3d75 | 386 | disk->cyl, ATA_CMD_INIT_DEV_PARAMS, &reset_hd); |
1da177e4 LT |
387 | if (reset) |
388 | goto repeat; | |
389 | } else | |
390 | hd_request(); | |
391 | } | |
392 | ||
393 | /* | |
394 | * Ok, don't know what to do with the unexpected interrupts: on some machines | |
395 | * doing a reset and a retry seems to result in an eternal loop. Right now I | |
396 | * ignore it, and just set the timeout. | |
397 | * | |
398 | * On laptops (and "green" PCs), an unexpected interrupt occurs whenever the | |
399 | * drive enters "idle", "standby", or "sleep" mode, so if the status looks | |
400 | * "good", we just ignore the interrupt completely. | |
401 | */ | |
402 | static void unexpected_hd_interrupt(void) | |
403 | { | |
404 | unsigned int stat = inb_p(HD_STATUS); | |
405 | ||
406 | if (stat & (BUSY_STAT|DRQ_STAT|ECC_STAT|ERR_STAT)) { | |
ec29782b | 407 | dump_status("unexpected interrupt", stat); |
1da177e4 LT |
408 | SET_TIMER; |
409 | } | |
410 | } | |
411 | ||
412 | /* | |
413 | * bad_rw_intr() now tries to be a bit smarter and does things | |
414 | * according to the error returned by the controller. | |
415 | * -Mika Liljeberg (liljeber@cs.Helsinki.FI) | |
416 | */ | |
417 | static void bad_rw_intr(void) | |
418 | { | |
8a12c4a4 TH |
419 | struct request *req = hd_req; |
420 | ||
1da177e4 LT |
421 | if (req != NULL) { |
422 | struct hd_i_struct *disk = req->rq_disk->private_data; | |
423 | if (++req->errors >= MAX_ERRORS || (hd_error & BBD_ERR)) { | |
8a12c4a4 | 424 | hd_end_request_cur(-EIO); |
1da177e4 LT |
425 | disk->special_op = disk->recalibrate = 1; |
426 | } else if (req->errors % RESET_FREQ == 0) | |
427 | reset = 1; | |
428 | else if ((hd_error & TRK0_ERR) || req->errors % RECAL_FREQ == 0) | |
429 | disk->special_op = disk->recalibrate = 1; | |
430 | /* Otherwise just retry */ | |
431 | } | |
432 | } | |
433 | ||
434 | static inline int wait_DRQ(void) | |
435 | { | |
b004223d AM |
436 | int retries; |
437 | int stat; | |
1da177e4 | 438 | |
b004223d AM |
439 | for (retries = 0; retries < 100000; retries++) { |
440 | stat = inb_p(HD_STATUS); | |
441 | if (stat & DRQ_STAT) | |
1da177e4 | 442 | return 0; |
b004223d | 443 | } |
1da177e4 LT |
444 | dump_status("wait_DRQ", stat); |
445 | return -1; | |
446 | } | |
447 | ||
448 | static void read_intr(void) | |
449 | { | |
450 | struct request *req; | |
451 | int i, retries = 100000; | |
452 | ||
453 | do { | |
454 | i = (unsigned) inb_p(HD_STATUS); | |
455 | if (i & BUSY_STAT) | |
456 | continue; | |
457 | if (!OK_STATUS(i)) | |
458 | break; | |
459 | if (i & DRQ_STAT) | |
460 | goto ok_to_read; | |
461 | } while (--retries > 0); | |
462 | dump_status("read_intr", i); | |
463 | bad_rw_intr(); | |
464 | hd_request(); | |
465 | return; | |
e091eb67 | 466 | |
1da177e4 | 467 | ok_to_read: |
8a12c4a4 | 468 | req = hd_req; |
ec29782b | 469 | insw(HD_DATA, req->buffer, 256); |
1da177e4 | 470 | #ifdef DEBUG |
83096ebf TH |
471 | printk("%s: read: sector %ld, remaining = %u, buffer=%p\n", |
472 | req->rq_disk->disk_name, blk_rq_pos(req) + 1, | |
473 | blk_rq_sectors(req) - 1, req->buffer+512); | |
1da177e4 | 474 | #endif |
8a12c4a4 | 475 | if (hd_end_request(0, 512)) { |
1da177e4 LT |
476 | SET_HANDLER(&read_intr); |
477 | return; | |
478 | } | |
e091eb67 | 479 | |
1da177e4 LT |
480 | (void) inb_p(HD_STATUS); |
481 | #if (HD_DELAY > 0) | |
482 | last_req = read_timer(); | |
483 | #endif | |
e091eb67 | 484 | hd_request(); |
1da177e4 LT |
485 | } |
486 | ||
487 | static void write_intr(void) | |
488 | { | |
8a12c4a4 | 489 | struct request *req = hd_req; |
1da177e4 LT |
490 | int i; |
491 | int retries = 100000; | |
492 | ||
493 | do { | |
494 | i = (unsigned) inb_p(HD_STATUS); | |
495 | if (i & BUSY_STAT) | |
496 | continue; | |
497 | if (!OK_STATUS(i)) | |
498 | break; | |
83096ebf | 499 | if ((blk_rq_sectors(req) <= 1) || (i & DRQ_STAT)) |
1da177e4 LT |
500 | goto ok_to_write; |
501 | } while (--retries > 0); | |
502 | dump_status("write_intr", i); | |
503 | bad_rw_intr(); | |
504 | hd_request(); | |
505 | return; | |
e091eb67 | 506 | |
1da177e4 | 507 | ok_to_write: |
8a12c4a4 | 508 | if (hd_end_request(0, 512)) { |
1da177e4 | 509 | SET_HANDLER(&write_intr); |
ec29782b | 510 | outsw(HD_DATA, req->buffer, 256); |
e091eb67 TH |
511 | return; |
512 | } | |
513 | ||
1da177e4 | 514 | #if (HD_DELAY > 0) |
e091eb67 | 515 | last_req = read_timer(); |
1da177e4 | 516 | #endif |
e091eb67 | 517 | hd_request(); |
1da177e4 LT |
518 | } |
519 | ||
520 | static void recal_intr(void) | |
521 | { | |
522 | check_status(); | |
523 | #if (HD_DELAY > 0) | |
524 | last_req = read_timer(); | |
525 | #endif | |
526 | hd_request(); | |
527 | } | |
528 | ||
529 | /* | |
530 | * This is another of the error-routines I don't know what to do with. The | |
531 | * best idea seems to just set reset, and start all over again. | |
532 | */ | |
533 | static void hd_times_out(unsigned long dummy) | |
534 | { | |
535 | char *name; | |
536 | ||
537 | do_hd = NULL; | |
538 | ||
8a12c4a4 | 539 | if (!hd_req) |
1da177e4 LT |
540 | return; |
541 | ||
e93b9fb7 | 542 | spin_lock_irq(hd_queue->queue_lock); |
1da177e4 | 543 | reset = 1; |
8a12c4a4 | 544 | name = hd_req->rq_disk->disk_name; |
1da177e4 | 545 | printk("%s: timeout\n", name); |
8a12c4a4 | 546 | if (++hd_req->errors >= MAX_ERRORS) { |
1da177e4 LT |
547 | #ifdef DEBUG |
548 | printk("%s: too many errors\n", name); | |
549 | #endif | |
8a12c4a4 | 550 | hd_end_request_cur(-EIO); |
1da177e4 | 551 | } |
1da177e4 | 552 | hd_request(); |
e93b9fb7 | 553 | spin_unlock_irq(hd_queue->queue_lock); |
1da177e4 LT |
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; | |
f26b3d75 | 560 | hd_out(disk, disk->sect, 0, 0, 0, ATA_CMD_RESTORE, &recal_intr); |
1da177e4 LT |
561 | return reset; |
562 | } | |
563 | if (disk->head > 16) { | |
ec29782b | 564 | printk("%s: cannot handle device with more than 16 heads - giving up\n", req->rq_disk->disk_name); |
8a12c4a4 | 565 | hd_end_request_cur(-EIO); |
1da177e4 LT |
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); | |
1da177e4 | 591 | |
8a12c4a4 | 592 | if (!hd_req) { |
9934c8c0 | 593 | hd_req = blk_fetch_request(hd_queue); |
8a12c4a4 TH |
594 | if (!hd_req) { |
595 | do_hd = NULL; | |
596 | return; | |
597 | } | |
1da177e4 | 598 | } |
8a12c4a4 | 599 | req = hd_req; |
1da177e4 LT |
600 | |
601 | if (reset) { | |
1da177e4 LT |
602 | reset_hd(); |
603 | return; | |
604 | } | |
605 | disk = req->rq_disk->private_data; | |
83096ebf TH |
606 | block = blk_rq_pos(req); |
607 | nsect = blk_rq_sectors(req); | |
1da177e4 LT |
608 | if (block >= get_capacity(req->rq_disk) || |
609 | ((block+nsect) > get_capacity(req->rq_disk))) { | |
610 | printk("%s: bad access: block=%d, count=%d\n", | |
611 | req->rq_disk->disk_name, block, nsect); | |
8a12c4a4 | 612 | hd_end_request_cur(-EIO); |
1da177e4 LT |
613 | goto repeat; |
614 | } | |
615 | ||
616 | if (disk->special_op) { | |
617 | if (do_special_op(disk, req)) | |
618 | goto repeat; | |
619 | return; | |
620 | } | |
621 | sec = block % disk->sect + 1; | |
622 | track = block / disk->sect; | |
623 | head = track % disk->head; | |
624 | cyl = track / disk->head; | |
625 | #ifdef DEBUG | |
626 | printk("%s: %sing: CHS=%d/%d/%d, sectors=%d, buffer=%p\n", | |
e654bc43 BH |
627 | req->rq_disk->disk_name, |
628 | req_data_dir(req) == READ ? "read" : "writ", | |
1da177e4 LT |
629 | cyl, head, sec, nsect, req->buffer); |
630 | #endif | |
4aff5e23 | 631 | if (blk_fs_request(req)) { |
1da177e4 LT |
632 | switch (rq_data_dir(req)) { |
633 | case READ: | |
f26b3d75 | 634 | hd_out(disk, nsect, sec, head, cyl, ATA_CMD_PIO_READ, |
ec29782b | 635 | &read_intr); |
1da177e4 LT |
636 | if (reset) |
637 | goto repeat; | |
638 | break; | |
639 | case WRITE: | |
f26b3d75 | 640 | hd_out(disk, nsect, sec, head, cyl, ATA_CMD_PIO_WRITE, |
ec29782b | 641 | &write_intr); |
1da177e4 LT |
642 | if (reset) |
643 | goto repeat; | |
644 | if (wait_DRQ()) { | |
645 | bad_rw_intr(); | |
646 | goto repeat; | |
647 | } | |
ec29782b | 648 | outsw(HD_DATA, req->buffer, 256); |
1da177e4 LT |
649 | break; |
650 | default: | |
651 | printk("unknown hd-command\n"); | |
8a12c4a4 | 652 | hd_end_request_cur(-EIO); |
1da177e4 LT |
653 | break; |
654 | } | |
655 | } | |
656 | } | |
657 | ||
ec29782b | 658 | static void do_hd_request(struct request_queue *q) |
1da177e4 | 659 | { |
1da177e4 | 660 | hd_request(); |
1da177e4 LT |
661 | } |
662 | ||
a885c8c4 | 663 | static int hd_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
1da177e4 | 664 | { |
a885c8c4 CH |
665 | struct hd_i_struct *disk = bdev->bd_disk->private_data; |
666 | ||
667 | geo->heads = disk->head; | |
668 | geo->sectors = disk->sect; | |
669 | geo->cylinders = disk->cyl; | |
670 | return 0; | |
1da177e4 LT |
671 | } |
672 | ||
673 | /* | |
674 | * Releasing a block device means we sync() it, so that it can safely | |
675 | * be forgotten about... | |
676 | */ | |
677 | ||
7d12e780 | 678 | static irqreturn_t hd_interrupt(int irq, void *dev_id) |
1da177e4 LT |
679 | { |
680 | void (*handler)(void) = do_hd; | |
681 | ||
e93b9fb7 TH |
682 | spin_lock(hd_queue->queue_lock); |
683 | ||
1da177e4 LT |
684 | do_hd = NULL; |
685 | del_timer(&device_timer); | |
686 | if (!handler) | |
687 | handler = unexpected_hd_interrupt; | |
688 | handler(); | |
e93b9fb7 TH |
689 | |
690 | spin_unlock(hd_queue->queue_lock); | |
691 | ||
1da177e4 LT |
692 | return IRQ_HANDLED; |
693 | } | |
694 | ||
695 | static struct block_device_operations hd_fops = { | |
a885c8c4 | 696 | .getgeo = hd_getgeo, |
1da177e4 LT |
697 | }; |
698 | ||
699 | /* | |
362537b9 | 700 | * This is the hard disk IRQ description. The IRQF_DISABLED in sa_flags |
1da177e4 LT |
701 | * means we run the IRQ-handler with interrupts disabled: this is bad for |
702 | * interrupt latency, but anything else has led to problems on some | |
703 | * machines. | |
704 | * | |
705 | * We enable interrupts in some of the routines after making sure it's | |
706 | * safe. | |
707 | */ | |
708 | ||
709 | static int __init hd_init(void) | |
710 | { | |
711 | int drive; | |
712 | ||
ddeb9c3e | 713 | if (register_blkdev(HD_MAJOR, "hd")) |
1da177e4 LT |
714 | return -1; |
715 | ||
716 | hd_queue = blk_init_queue(do_hd_request, &hd_lock); | |
717 | if (!hd_queue) { | |
ddeb9c3e | 718 | unregister_blkdev(HD_MAJOR, "hd"); |
1da177e4 LT |
719 | return -ENOMEM; |
720 | } | |
721 | ||
722 | blk_queue_max_sectors(hd_queue, 255); | |
723 | init_timer(&device_timer); | |
724 | device_timer.function = hd_times_out; | |
e1defc4f | 725 | blk_queue_logical_block_size(hd_queue, 512); |
1da177e4 | 726 | |
1da177e4 | 727 | if (!NR_HD) { |
48dd643c PA |
728 | /* |
729 | * We don't know anything about the drive. This means | |
1da177e4 LT |
730 | * that you *MUST* specify the drive parameters to the |
731 | * kernel yourself. | |
48dd643c PA |
732 | * |
733 | * If we were on an i386, we used to read this info from | |
734 | * the BIOS or CMOS. This doesn't work all that well, | |
735 | * since this assumes that this is a primary or secondary | |
736 | * drive, and if we're using this legacy driver, it's | |
737 | * probably an auxilliary controller added to recover | |
738 | * legacy data off an ST-506 drive. Either way, it's | |
739 | * definitely safest to have the user explicitly specify | |
740 | * the information. | |
1da177e4 LT |
741 | */ |
742 | printk("hd: no drives specified - use hd=cyl,head,sectors" | |
743 | " on kernel command line\n"); | |
1da177e4 | 744 | goto out; |
48dd643c | 745 | } |
1da177e4 | 746 | |
ec29782b | 747 | for (drive = 0 ; drive < NR_HD ; drive++) { |
1da177e4 LT |
748 | struct gendisk *disk = alloc_disk(64); |
749 | struct hd_i_struct *p = &hd_info[drive]; | |
750 | if (!disk) | |
751 | goto Enomem; | |
ddeb9c3e | 752 | disk->major = HD_MAJOR; |
1da177e4 LT |
753 | disk->first_minor = drive << 6; |
754 | disk->fops = &hd_fops; | |
755 | sprintf(disk->disk_name, "hd%c", 'a'+drive); | |
756 | disk->private_data = p; | |
757 | set_capacity(disk, p->head * p->sect * p->cyl); | |
758 | disk->queue = hd_queue; | |
759 | p->unit = drive; | |
760 | hd_gendisk[drive] = disk; | |
ec29782b | 761 | printk("%s: %luMB, CHS=%d/%d/%d\n", |
1da177e4 LT |
762 | disk->disk_name, (unsigned long)get_capacity(disk)/2048, |
763 | p->cyl, p->head, p->sect); | |
764 | } | |
765 | ||
362537b9 | 766 | if (request_irq(HD_IRQ, hd_interrupt, IRQF_DISABLED, "hd", NULL)) { |
1da177e4 LT |
767 | printk("hd: unable to get IRQ%d for the hard disk driver\n", |
768 | HD_IRQ); | |
769 | goto out1; | |
770 | } | |
771 | if (!request_region(HD_DATA, 8, "hd")) { | |
772 | printk(KERN_WARNING "hd: port 0x%x busy\n", HD_DATA); | |
773 | goto out2; | |
774 | } | |
775 | if (!request_region(HD_CMD, 1, "hd(cmd)")) { | |
776 | printk(KERN_WARNING "hd: port 0x%x busy\n", HD_CMD); | |
777 | goto out3; | |
778 | } | |
779 | ||
780 | /* Let them fly */ | |
ec29782b | 781 | for (drive = 0; drive < NR_HD; drive++) |
1da177e4 LT |
782 | add_disk(hd_gendisk[drive]); |
783 | ||
784 | return 0; | |
785 | ||
786 | out3: | |
787 | release_region(HD_DATA, 8); | |
788 | out2: | |
789 | free_irq(HD_IRQ, NULL); | |
790 | out1: | |
791 | for (drive = 0; drive < NR_HD; drive++) | |
792 | put_disk(hd_gendisk[drive]); | |
793 | NR_HD = 0; | |
794 | out: | |
795 | del_timer(&device_timer); | |
ddeb9c3e | 796 | unregister_blkdev(HD_MAJOR, "hd"); |
1da177e4 LT |
797 | blk_cleanup_queue(hd_queue); |
798 | return -1; | |
799 | Enomem: | |
800 | while (drive--) | |
801 | put_disk(hd_gendisk[drive]); | |
802 | goto out; | |
803 | } | |
804 | ||
ec29782b PC |
805 | static int __init parse_hd_setup(char *line) |
806 | { | |
1da177e4 LT |
807 | int ints[6]; |
808 | ||
809 | (void) get_options(line, ARRAY_SIZE(ints), ints); | |
810 | hd_setup(NULL, ints); | |
811 | ||
812 | return 1; | |
813 | } | |
814 | __setup("hd=", parse_hd_setup); | |
815 | ||
01c22bfc | 816 | late_initcall(hd_init); |