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/string.h>
38#include <linux/ioport.h>
39#include <linux/init.h>
40#include <linux/blkpg.h>
41#include <linux/ata.h>
42#include <linux/hdreg.h>
43
44#define HD_IRQ 14
45
46#define REALLY_SLOW_IO
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;
99static struct request *hd_req;
100
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
112static void recal_intr(void);
113static void bad_rw_intr(void);
114
115static int reset;
116static int hd_error;
117
118/*
119 *  This struct defines the HD's and their types.
120 */
121struct hd_i_struct {
122	unsigned int head, sect, cyl, wpcom, lzone, ctl;
123	int unit;
124	int recalibrate;
125	int special_op;
126};
127
128#ifdef HD_TYPE
129static struct hd_i_struct hd_info[] = { HD_TYPE };
130static int NR_HD = ARRAY_SIZE(hd_info);
131#else
132static struct hd_i_struct hd_info[MAX_HD];
133static int NR_HD;
134#endif
135
136static struct gendisk *hd_gendisk[MAX_HD];
137
138static 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
147static void (*do_hd)(void) = NULL;
148#define SET_HANDLER(x) \
149if ((do_hd = (x)) != NULL) \
150	SET_TIMER; \
151else \
152	del_timer(&device_timer);
153
154
155#if (HD_DELAY > 0)
156
157#include <linux/i8253.h>
158
159unsigned long last_req;
160
161unsigned long read_timer(void)
162{
163	unsigned long t, flags;
164	int i;
165
166	raw_spin_lock_irqsave(&i8253_lock, flags);
167	t = jiffies * 11932;
168	outb_p(0, 0x43);
169	i = inb_p(0x40);
170	i |= inb(0x40) << 8;
171	raw_spin_unlock_irqrestore(&i8253_lock, flags);
172	return(t - i);
173}
174#endif
175
176static 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)
183		hdind = 1;
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
193static 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
201static bool hd_end_request_cur(int err)
202{
203	return hd_end_request(err, blk_rq_cur_bytes(hd_req));
204}
205
206static void dump_status(const char *msg, unsigned int stat)
207{
208	char *name = "hd?";
209	if (hd_req)
210		name = hd_req->rq_disk->disk_name;
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));
238			if (hd_req)
239				printk(", sector=%ld", blk_rq_pos(hd_req));
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
254static 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
264static 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
275static 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
290static 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
304static 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);
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);
334}
335
336static void hd_request (void);
337
338static 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
352static void reset_controller(void)
353{
354	int	i;
355
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();
360	if (drive_busy())
361		printk("hd: controller still busy\n");
362	else if ((hd_error = inb(HD_ERROR)) != 1)
363		printk("hd: controller reset failed: %02x\n", hd_error);
364}
365
366static void reset_hd(void)
367{
368	static int i;
369
370repeat:
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;
383		hd_out(disk, disk->sect, disk->sect, disk->head-1,
384			disk->cyl, ATA_CMD_INIT_DEV_PARAMS, &reset_hd);
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 */
400static 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)) {
405		dump_status("unexpected interrupt", stat);
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 */
415static void bad_rw_intr(void)
416{
417	struct request *req = hd_req;
418
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)) {
422			hd_end_request_cur(-EIO);
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
432static inline int wait_DRQ(void)
433{
434	int retries;
435	int stat;
436
437	for (retries = 0; retries < 100000; retries++) {
438		stat = inb_p(HD_STATUS);
439		if (stat & DRQ_STAT)
440			return 0;
441	}
442	dump_status("wait_DRQ", stat);
443	return -1;
444}
445
446static 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;
464
465ok_to_read:
466	req = hd_req;
467	insw(HD_DATA, bio_data(req->bio), 256);
468#ifdef DEBUG
469	printk("%s: read: sector %ld, remaining = %u, buffer=%p\n",
470	       req->rq_disk->disk_name, blk_rq_pos(req) + 1,
471	       blk_rq_sectors(req) - 1, bio_data(req->bio)+512);
472#endif
473	if (hd_end_request(0, 512)) {
474		SET_HANDLER(&read_intr);
475		return;
476	}
477
478	(void) inb_p(HD_STATUS);
479#if (HD_DELAY > 0)
480	last_req = read_timer();
481#endif
482	hd_request();
483}
484
485static void write_intr(void)
486{
487	struct request *req = hd_req;
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;
497		if ((blk_rq_sectors(req) <= 1) || (i & DRQ_STAT))
498			goto ok_to_write;
499	} while (--retries > 0);
500	dump_status("write_intr", i);
501	bad_rw_intr();
502	hd_request();
503	return;
504
505ok_to_write:
506	if (hd_end_request(0, 512)) {
507		SET_HANDLER(&write_intr);
508		outsw(HD_DATA, bio_data(req->bio), 256);
509		return;
510	}
511
512#if (HD_DELAY > 0)
513	last_req = read_timer();
514#endif
515	hd_request();
516}
517
518static 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 */
531static void hd_times_out(unsigned long dummy)
532{
533	char *name;
534
535	do_hd = NULL;
536
537	if (!hd_req)
538		return;
539
540	spin_lock_irq(hd_queue->queue_lock);
541	reset = 1;
542	name = hd_req->rq_disk->disk_name;
543	printk("%s: timeout\n", name);
544	if (++hd_req->errors >= MAX_ERRORS) {
545#ifdef DEBUG
546		printk("%s: too many errors\n", name);
547#endif
548		hd_end_request_cur(-EIO);
549	}
550	hd_request();
551	spin_unlock_irq(hd_queue->queue_lock);
552}
553
554static int do_special_op(struct hd_i_struct *disk, struct request *req)
555{
556	if (disk->recalibrate) {
557		disk->recalibrate = 0;
558		hd_out(disk, disk->sect, 0, 0, 0, ATA_CMD_RESTORE, &recal_intr);
559		return reset;
560	}
561	if (disk->head > 16) {
562		printk("%s: cannot handle device with more than 16 heads - giving up\n", req->rq_disk->disk_name);
563		hd_end_request_cur(-EIO);
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 */
579static 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;
587repeat:
588	del_timer(&device_timer);
589
590	if (!hd_req) {
591		hd_req = blk_fetch_request(hd_queue);
592		if (!hd_req) {
593			do_hd = NULL;
594			return;
595		}
596	}
597	req = hd_req;
598
599	if (reset) {
600		reset_hd();
601		return;
602	}
603	disk = req->rq_disk->private_data;
604	block = blk_rq_pos(req);
605	nsect = blk_rq_sectors(req);
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);
610		hd_end_request_cur(-EIO);
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",
625		req->rq_disk->disk_name,
626		req_data_dir(req) == READ ? "read" : "writ",
627		cyl, head, sec, nsect, bio_data(req->bio));
628#endif
629	if (req->cmd_type == REQ_TYPE_FS) {
630		switch (rq_data_dir(req)) {
631		case READ:
632			hd_out(disk, nsect, sec, head, cyl, ATA_CMD_PIO_READ,
633				&read_intr);
634			if (reset)
635				goto repeat;
636			break;
637		case WRITE:
638			hd_out(disk, nsect, sec, head, cyl, ATA_CMD_PIO_WRITE,
639				&write_intr);
640			if (reset)
641				goto repeat;
642			if (wait_DRQ()) {
643				bad_rw_intr();
644				goto repeat;
645			}
646			outsw(HD_DATA, bio_data(req->bio), 256);
647			break;
648		default:
649			printk("unknown hd-command\n");
650			hd_end_request_cur(-EIO);
651			break;
652		}
653	}
654}
655
656static void do_hd_request(struct request_queue *q)
657{
658	hd_request();
659}
660
661static int hd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
662{
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;
669}
670
671/*
672 * Releasing a block device means we sync() it, so that it can safely
673 * be forgotten about...
674 */
675
676static irqreturn_t hd_interrupt(int irq, void *dev_id)
677{
678	void (*handler)(void) = do_hd;
679
680	spin_lock(hd_queue->queue_lock);
681
682	do_hd = NULL;
683	del_timer(&device_timer);
684	if (!handler)
685		handler = unexpected_hd_interrupt;
686	handler();
687
688	spin_unlock(hd_queue->queue_lock);
689
690	return IRQ_HANDLED;
691}
692
693static const struct block_device_operations hd_fops = {
694	.getgeo =	hd_getgeo,
695};
696
697static int __init hd_init(void)
698{
699	int drive;
700
701	if (register_blkdev(HD_MAJOR, "hd"))
702		return -1;
703
704	hd_queue = blk_init_queue(do_hd_request, &hd_lock);
705	if (!hd_queue) {
706		unregister_blkdev(HD_MAJOR, "hd");
707		return -ENOMEM;
708	}
709
710	blk_queue_max_hw_sectors(hd_queue, 255);
711	init_timer(&device_timer);
712	device_timer.function = hd_times_out;
713	blk_queue_logical_block_size(hd_queue, 512);
714
715	if (!NR_HD) {
716		/*
717		 * We don't know anything about the drive.  This means
718		 * that you *MUST* specify the drive parameters to the
719		 * kernel yourself.
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
725		 * probably an auxiliary controller added to recover
726		 * legacy data off an ST-506 drive.  Either way, it's
727		 * definitely safest to have the user explicitly specify
728		 * the information.
729		 */
730		printk("hd: no drives specified - use hd=cyl,head,sectors"
731			" on kernel command line\n");
732		goto out;
733	}
734
735	for (drive = 0 ; drive < NR_HD ; drive++) {
736		struct gendisk *disk = alloc_disk(64);
737		struct hd_i_struct *p = &hd_info[drive];
738		if (!disk)
739			goto Enomem;
740		disk->major = HD_MAJOR;
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;
749		printk("%s: %luMB, CHS=%d/%d/%d\n",
750			disk->disk_name, (unsigned long)get_capacity(disk)/2048,
751			p->cyl, p->head, p->sect);
752	}
753
754	if (request_irq(HD_IRQ, hd_interrupt, 0, "hd", NULL)) {
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 */
769	for (drive = 0; drive < NR_HD; drive++)
770		add_disk(hd_gendisk[drive]);
771
772	return 0;
773
774out3:
775	release_region(HD_DATA, 8);
776out2:
777	free_irq(HD_IRQ, NULL);
778out1:
779	for (drive = 0; drive < NR_HD; drive++)
780		put_disk(hd_gendisk[drive]);
781	NR_HD = 0;
782out:
783	del_timer(&device_timer);
784	unregister_blkdev(HD_MAJOR, "hd");
785	blk_cleanup_queue(hd_queue);
786	return -1;
787Enomem:
788	while (drive--)
789		put_disk(hd_gendisk[drive]);
790	goto out;
791}
792
793static int __init parse_hd_setup(char *line)
794{
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
804late_initcall(hd_init);
805