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authorAdrian Bunk <bunk@kernel.org>2008-07-16 14:33:47 -0400
committerBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2008-07-16 14:33:47 -0400
commit453ea3ed0b3e8ad67d4ee9d2fccf3d95a3e1f709 (patch)
tree359db77d614ee17d948a9e9fc318174c12e96377 /drivers/ide/legacy/hd.c
parent01c22bfc30a3f40fed08cfd2779348edcb6c5e53 (diff)
move ide/legacy/hd.c to drivers/block/
This patch moves hd.c to drivers/block/ Signed-off-by: Adrian Bunk <bunk@kernel.org> Cc: rmk@arm.linux.org.uk Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Diffstat (limited to 'drivers/ide/legacy/hd.c')
-rw-r--r--drivers/ide/legacy/hd.c815
1 files changed, 0 insertions, 815 deletions
diff --git a/drivers/ide/legacy/hd.c b/drivers/ide/legacy/hd.c
deleted file mode 100644
index 00b695652b2a..000000000000
--- a/drivers/ide/legacy/hd.c
+++ /dev/null
@@ -1,815 +0,0 @@
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
97static DEFINE_SPINLOCK(hd_lock);
98static 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
115static void recal_intr(void);
116static void bad_rw_intr(void);
117
118static int reset;
119static int hd_error;
120
121/*
122 * This struct defines the HD's and their types.
123 */
124struct 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
132static struct hd_i_struct hd_info[] = { HD_TYPE };
133static int NR_HD = ARRAY_SIZE(hd_info);
134#else
135static struct hd_i_struct hd_info[MAX_HD];
136static int NR_HD;
137#endif
138
139static struct gendisk *hd_gendisk[MAX_HD];
140
141static 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
150static void (*do_hd)(void) = NULL;
151#define SET_HANDLER(x) \
152if ((do_hd = (x)) != NULL) \
153 SET_TIMER; \
154else \
155 del_timer(&device_timer);
156
157
158#if (HD_DELAY > 0)
159
160#include <asm/i8253.h>
161
162unsigned long last_req;
163
164unsigned long read_timer(void)
165{
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
179static 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
196static 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
244static 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
254static 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
265static 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
280static 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
294static void hd_out(struct hd_i_struct *disk,
295 unsigned int nsect,
296 unsigned int sect,
297 unsigned int head,
298 unsigned int cyl,
299 unsigned int cmd,
300 void (*intr_addr)(void))
301{
302 unsigned short port;
303
304#if (HD_DELAY > 0)
305 while (read_timer() - last_req < HD_DELAY)
306 /* nothing */;
307#endif
308 if (reset)
309 return;
310 if (!controller_ready(disk->unit, head)) {
311 reset = 1;
312 return;
313 }
314 SET_HANDLER(intr_addr);
315 outb_p(disk->ctl, HD_CMD);
316 port = HD_DATA;
317 outb_p(disk->wpcom >> 2, ++port);
318 outb_p(nsect, ++port);
319 outb_p(sect, ++port);
320 outb_p(cyl, ++port);
321 outb_p(cyl >> 8, ++port);
322 outb_p(0xA0 | (disk->unit << 4) | head, ++port);
323 outb_p(cmd, ++port);
324}
325
326static void hd_request (void);
327
328static int drive_busy(void)
329{
330 unsigned int i;
331 unsigned char c;
332
333 for (i = 0; i < 500000 ; i++) {
334 c = inb_p(HD_STATUS);
335 if ((c & (BUSY_STAT | READY_STAT | SEEK_STAT)) == STAT_OK)
336 return 0;
337 }
338 dump_status("reset timed out", c);
339 return 1;
340}
341
342static void reset_controller(void)
343{
344 int i;
345
346 outb_p(4, HD_CMD);
347 for (i = 0; i < 1000; i++) barrier();
348 outb_p(hd_info[0].ctl & 0x0f, HD_CMD);
349 for (i = 0; i < 1000; i++) barrier();
350 if (drive_busy())
351 printk("hd: controller still busy\n");
352 else if ((hd_error = inb(HD_ERROR)) != 1)
353 printk("hd: controller reset failed: %02x\n", hd_error);
354}
355
356static void reset_hd(void)
357{
358 static int i;
359
360repeat:
361 if (reset) {
362 reset = 0;
363 i = -1;
364 reset_controller();
365 } else {
366 check_status();
367 if (reset)
368 goto repeat;
369 }
370 if (++i < NR_HD) {
371 struct hd_i_struct *disk = &hd_info[i];
372 disk->special_op = disk->recalibrate = 1;
373 hd_out(disk, disk->sect, disk->sect, disk->head-1,
374 disk->cyl, WIN_SPECIFY, &reset_hd);
375 if (reset)
376 goto repeat;
377 } else
378 hd_request();
379}
380
381/*
382 * Ok, don't know what to do with the unexpected interrupts: on some machines
383 * doing a reset and a retry seems to result in an eternal loop. Right now I
384 * ignore it, and just set the timeout.
385 *
386 * On laptops (and "green" PCs), an unexpected interrupt occurs whenever the
387 * drive enters "idle", "standby", or "sleep" mode, so if the status looks
388 * "good", we just ignore the interrupt completely.
389 */
390static void unexpected_hd_interrupt(void)
391{
392 unsigned int stat = inb_p(HD_STATUS);
393
394 if (stat & (BUSY_STAT|DRQ_STAT|ECC_STAT|ERR_STAT)) {
395 dump_status("unexpected interrupt", stat);
396 SET_TIMER;
397 }
398}
399
400/*
401 * bad_rw_intr() now tries to be a bit smarter and does things
402 * according to the error returned by the controller.
403 * -Mika Liljeberg (liljeber@cs.Helsinki.FI)
404 */
405static void bad_rw_intr(void)
406{
407 struct request *req = CURRENT;
408 if (req != NULL) {
409 struct hd_i_struct *disk = req->rq_disk->private_data;
410 if (++req->errors >= MAX_ERRORS || (hd_error & BBD_ERR)) {
411 end_request(req, 0);
412 disk->special_op = disk->recalibrate = 1;
413 } else if (req->errors % RESET_FREQ == 0)
414 reset = 1;
415 else if ((hd_error & TRK0_ERR) || req->errors % RECAL_FREQ == 0)
416 disk->special_op = disk->recalibrate = 1;
417 /* Otherwise just retry */
418 }
419}
420
421static inline int wait_DRQ(void)
422{
423 int retries;
424 int stat;
425
426 for (retries = 0; retries < 100000; retries++) {
427 stat = inb_p(HD_STATUS);
428 if (stat & DRQ_STAT)
429 return 0;
430 }
431 dump_status("wait_DRQ", stat);
432 return -1;
433}
434
435static void read_intr(void)
436{
437 struct request *req;
438 int i, retries = 100000;
439
440 do {
441 i = (unsigned) inb_p(HD_STATUS);
442 if (i & BUSY_STAT)
443 continue;
444 if (!OK_STATUS(i))
445 break;
446 if (i & DRQ_STAT)
447 goto ok_to_read;
448 } while (--retries > 0);
449 dump_status("read_intr", i);
450 bad_rw_intr();
451 hd_request();
452 return;
453ok_to_read:
454 req = CURRENT;
455 insw(HD_DATA, req->buffer, 256);
456 req->sector++;
457 req->buffer += 512;
458 req->errors = 0;
459 i = --req->nr_sectors;
460 --req->current_nr_sectors;
461#ifdef DEBUG
462 printk("%s: read: sector %ld, remaining = %ld, buffer=%p\n",
463 req->rq_disk->disk_name, req->sector, req->nr_sectors,
464 req->buffer+512);
465#endif
466 if (req->current_nr_sectors <= 0)
467 end_request(req, 1);
468 if (i > 0) {
469 SET_HANDLER(&read_intr);
470 return;
471 }
472 (void) inb_p(HD_STATUS);
473#if (HD_DELAY > 0)
474 last_req = read_timer();
475#endif
476 if (elv_next_request(QUEUE))
477 hd_request();
478 return;
479}
480
481static void write_intr(void)
482{
483 struct request *req = CURRENT;
484 int i;
485 int retries = 100000;
486
487 do {
488 i = (unsigned) inb_p(HD_STATUS);
489 if (i & BUSY_STAT)
490 continue;
491 if (!OK_STATUS(i))
492 break;
493 if ((req->nr_sectors <= 1) || (i & DRQ_STAT))
494 goto ok_to_write;
495 } while (--retries > 0);
496 dump_status("write_intr", i);
497 bad_rw_intr();
498 hd_request();
499 return;
500ok_to_write:
501 req->sector++;
502 i = --req->nr_sectors;
503 --req->current_nr_sectors;
504 req->buffer += 512;
505 if (!i || (req->bio && req->current_nr_sectors <= 0))
506 end_request(req, 1);
507 if (i > 0) {
508 SET_HANDLER(&write_intr);
509 outsw(HD_DATA, req->buffer, 256);
510 local_irq_enable();
511 } else {
512#if (HD_DELAY > 0)
513 last_req = read_timer();
514#endif
515 hd_request();
516 }
517 return;
518}
519
520static 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 */
533static void hd_times_out(unsigned long dummy)
534{
535 char *name;
536
537 do_hd = NULL;
538
539 if (!CURRENT)
540 return;
541
542 disable_irq(HD_IRQ);
543 local_irq_enable();
544 reset = 1;
545 name = CURRENT->rq_disk->disk_name;
546 printk("%s: timeout\n", name);
547 if (++CURRENT->errors >= MAX_ERRORS) {
548#ifdef DEBUG
549 printk("%s: too many errors\n", name);
550#endif
551 end_request(CURRENT, 0);
552 }
553 local_irq_disable();
554 hd_request();
555 enable_irq(HD_IRQ);
556}
557
558static int do_special_op(struct hd_i_struct *disk, struct request *req)
559{
560 if (disk->recalibrate) {
561 disk->recalibrate = 0;
562 hd_out(disk, disk->sect, 0, 0, 0, WIN_RESTORE, &recal_intr);
563 return reset;
564 }
565 if (disk->head > 16) {
566 printk("%s: cannot handle device with more than 16 heads - giving up\n", req->rq_disk->disk_name);
567 end_request(req, 0);
568 }
569 disk->special_op = 0;
570 return 1;
571}
572
573/*
574 * The driver enables interrupts as much as possible. In order to do this,
575 * (a) the device-interrupt is disabled before entering hd_request(),
576 * and (b) the timeout-interrupt is disabled before the sti().
577 *
578 * Interrupts are still masked (by default) whenever we are exchanging
579 * data/cmds with a drive, because some drives seem to have very poor
580 * tolerance for latency during I/O. The IDE driver has support to unmask
581 * interrupts for non-broken hardware, so use that driver if required.
582 */
583static void hd_request(void)
584{
585 unsigned int block, nsect, sec, track, head, cyl;
586 struct hd_i_struct *disk;
587 struct request *req;
588
589 if (do_hd)
590 return;
591repeat:
592 del_timer(&device_timer);
593 local_irq_enable();
594
595 req = CURRENT;
596 if (!req) {
597 do_hd = NULL;
598 return;
599 }
600
601 if (reset) {
602 local_irq_disable();
603 reset_hd();
604 return;
605 }
606 disk = req->rq_disk->private_data;
607 block = req->sector;
608 nsect = req->nr_sectors;
609 if (block >= get_capacity(req->rq_disk) ||
610 ((block+nsect) > get_capacity(req->rq_disk))) {
611 printk("%s: bad access: block=%d, count=%d\n",
612 req->rq_disk->disk_name, block, nsect);
613 end_request(req, 0);
614 goto repeat;
615 }
616
617 if (disk->special_op) {
618 if (do_special_op(disk, req))
619 goto repeat;
620 return;
621 }
622 sec = block % disk->sect + 1;
623 track = block / disk->sect;
624 head = track % disk->head;
625 cyl = track / disk->head;
626#ifdef DEBUG
627 printk("%s: %sing: CHS=%d/%d/%d, sectors=%d, buffer=%p\n",
628 req->rq_disk->disk_name,
629 req_data_dir(req) == READ ? "read" : "writ",
630 cyl, head, sec, nsect, req->buffer);
631#endif
632 if (blk_fs_request(req)) {
633 switch (rq_data_dir(req)) {
634 case READ:
635 hd_out(disk, nsect, sec, head, cyl, WIN_READ,
636 &read_intr);
637 if (reset)
638 goto repeat;
639 break;
640 case WRITE:
641 hd_out(disk, nsect, sec, head, cyl, WIN_WRITE,
642 &write_intr);
643 if (reset)
644 goto repeat;
645 if (wait_DRQ()) {
646 bad_rw_intr();
647 goto repeat;
648 }
649 outsw(HD_DATA, req->buffer, 256);
650 break;
651 default:
652 printk("unknown hd-command\n");
653 end_request(req, 0);
654 break;
655 }
656 }
657}
658
659static void do_hd_request(struct request_queue *q)
660{
661 disable_irq(HD_IRQ);
662 hd_request();
663 enable_irq(HD_IRQ);
664}
665
666static int hd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
667{
668 struct hd_i_struct *disk = bdev->bd_disk->private_data;
669
670 geo->heads = disk->head;
671 geo->sectors = disk->sect;
672 geo->cylinders = disk->cyl;
673 return 0;
674}
675
676/*
677 * Releasing a block device means we sync() it, so that it can safely
678 * be forgotten about...
679 */
680
681static irqreturn_t hd_interrupt(int irq, void *dev_id)
682{
683 void (*handler)(void) = do_hd;
684
685 do_hd = NULL;
686 del_timer(&device_timer);
687 if (!handler)
688 handler = unexpected_hd_interrupt;
689 handler();
690 local_irq_enable();
691 return IRQ_HANDLED;
692}
693
694static struct block_device_operations hd_fops = {
695 .getgeo = hd_getgeo,
696};
697
698/*
699 * This is the hard disk IRQ description. The IRQF_DISABLED in sa_flags
700 * means we run the IRQ-handler with interrupts disabled: this is bad for
701 * interrupt latency, but anything else has led to problems on some
702 * machines.
703 *
704 * We enable interrupts in some of the routines after making sure it's
705 * safe.
706 */
707
708static int __init hd_init(void)
709{
710 int drive;
711
712 if (register_blkdev(MAJOR_NR, "hd"))
713 return -1;
714
715 hd_queue = blk_init_queue(do_hd_request, &hd_lock);
716 if (!hd_queue) {
717 unregister_blkdev(MAJOR_NR, "hd");
718 return -ENOMEM;
719 }
720
721 blk_queue_max_sectors(hd_queue, 255);
722 init_timer(&device_timer);
723 device_timer.function = hd_times_out;
724 blk_queue_hardsect_size(hd_queue, 512);
725
726 if (!NR_HD) {
727 /*
728 * We don't know anything about the drive. This means
729 * that you *MUST* specify the drive parameters to the
730 * kernel yourself.
731 *
732 * If we were on an i386, we used to read this info from
733 * the BIOS or CMOS. This doesn't work all that well,
734 * since this assumes that this is a primary or secondary
735 * drive, and if we're using this legacy driver, it's
736 * probably an auxilliary controller added to recover
737 * legacy data off an ST-506 drive. Either way, it's
738 * definitely safest to have the user explicitly specify
739 * the information.
740 */
741 printk("hd: no drives specified - use hd=cyl,head,sectors"
742 " on kernel command line\n");
743 goto out;
744 }
745
746 for (drive = 0 ; drive < NR_HD ; drive++) {
747 struct gendisk *disk = alloc_disk(64);
748 struct hd_i_struct *p = &hd_info[drive];
749 if (!disk)
750 goto Enomem;
751 disk->major = MAJOR_NR;
752 disk->first_minor = drive << 6;
753 disk->fops = &hd_fops;
754 sprintf(disk->disk_name, "hd%c", 'a'+drive);
755 disk->private_data = p;
756 set_capacity(disk, p->head * p->sect * p->cyl);
757 disk->queue = hd_queue;
758 p->unit = drive;
759 hd_gendisk[drive] = disk;
760 printk("%s: %luMB, CHS=%d/%d/%d\n",
761 disk->disk_name, (unsigned long)get_capacity(disk)/2048,
762 p->cyl, p->head, p->sect);
763 }
764
765 if (request_irq(HD_IRQ, hd_interrupt, IRQF_DISABLED, "hd", NULL)) {
766 printk("hd: unable to get IRQ%d for the hard disk driver\n",
767 HD_IRQ);
768 goto out1;
769 }
770 if (!request_region(HD_DATA, 8, "hd")) {
771 printk(KERN_WARNING "hd: port 0x%x busy\n", HD_DATA);
772 goto out2;
773 }
774 if (!request_region(HD_CMD, 1, "hd(cmd)")) {
775 printk(KERN_WARNING "hd: port 0x%x busy\n", HD_CMD);
776 goto out3;
777 }
778
779 /* Let them fly */
780 for (drive = 0; drive < NR_HD; drive++)
781 add_disk(hd_gendisk[drive]);
782
783 return 0;
784
785out3:
786 release_region(HD_DATA, 8);
787out2:
788 free_irq(HD_IRQ, NULL);
789out1:
790 for (drive = 0; drive < NR_HD; drive++)
791 put_disk(hd_gendisk[drive]);
792 NR_HD = 0;
793out:
794 del_timer(&device_timer);
795 unregister_blkdev(MAJOR_NR, "hd");
796 blk_cleanup_queue(hd_queue);
797 return -1;
798Enomem:
799 while (drive--)
800 put_disk(hd_gendisk[drive]);
801 goto out;
802}
803
804static int __init parse_hd_setup(char *line)
805{
806 int ints[6];
807
808 (void) get_options(line, ARRAY_SIZE(ints), ints);
809 hd_setup(NULL, ints);
810
811 return 1;
812}
813__setup("hd=", parse_hd_setup);
814
815late_initcall(hd_init);
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-12 08:34:38 -0500