Root/drivers/block/hd.c

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, req->buffer, 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, req->buffer+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, req->buffer, 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, req->buffer);
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, req->buffer, 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
697/*
698 * This is the hard disk IRQ description. The IRQF_DISABLED in sa_flags
699 * means we run the IRQ-handler with interrupts disabled: this is bad for
700 * interrupt latency, but anything else has led to problems on some
701 * machines.
702 *
703 * We enable interrupts in some of the routines after making sure it's
704 * safe.
705 */
706
707static int __init hd_init(void)
708{
709    int drive;
710
711    if (register_blkdev(HD_MAJOR, "hd"))
712        return -1;
713
714    hd_queue = blk_init_queue(do_hd_request, &hd_lock);
715    if (!hd_queue) {
716        unregister_blkdev(HD_MAJOR, "hd");
717        return -ENOMEM;
718    }
719
720    blk_queue_max_hw_sectors(hd_queue, 255);
721    init_timer(&device_timer);
722    device_timer.function = hd_times_out;
723    blk_queue_logical_block_size(hd_queue, 512);
724
725    if (!NR_HD) {
726        /*
727         * We don't know anything about the drive. This means
728         * that you *MUST* specify the drive parameters to the
729         * kernel yourself.
730         *
731         * If we were on an i386, we used to read this info from
732         * the BIOS or CMOS. This doesn't work all that well,
733         * since this assumes that this is a primary or secondary
734         * drive, and if we're using this legacy driver, it's
735         * probably an auxiliary controller added to recover
736         * legacy data off an ST-506 drive. Either way, it's
737         * definitely safest to have the user explicitly specify
738         * the information.
739         */
740        printk("hd: no drives specified - use hd=cyl,head,sectors"
741            " on kernel command line\n");
742        goto out;
743    }
744
745    for (drive = 0 ; drive < NR_HD ; drive++) {
746        struct gendisk *disk = alloc_disk(64);
747        struct hd_i_struct *p = &hd_info[drive];
748        if (!disk)
749            goto Enomem;
750        disk->major = HD_MAJOR;
751        disk->first_minor = drive << 6;
752        disk->fops = &hd_fops;
753        sprintf(disk->disk_name, "hd%c", 'a'+drive);
754        disk->private_data = p;
755        set_capacity(disk, p->head * p->sect * p->cyl);
756        disk->queue = hd_queue;
757        p->unit = drive;
758        hd_gendisk[drive] = disk;
759        printk("%s: %luMB, CHS=%d/%d/%d\n",
760            disk->disk_name, (unsigned long)get_capacity(disk)/2048,
761            p->cyl, p->head, p->sect);
762    }
763
764    if (request_irq(HD_IRQ, hd_interrupt, IRQF_DISABLED, "hd", NULL)) {
765        printk("hd: unable to get IRQ%d for the hard disk driver\n",
766            HD_IRQ);
767        goto out1;
768    }
769    if (!request_region(HD_DATA, 8, "hd")) {
770        printk(KERN_WARNING "hd: port 0x%x busy\n", HD_DATA);
771        goto out2;
772    }
773    if (!request_region(HD_CMD, 1, "hd(cmd)")) {
774        printk(KERN_WARNING "hd: port 0x%x busy\n", HD_CMD);
775        goto out3;
776    }
777
778    /* Let them fly */
779    for (drive = 0; drive < NR_HD; drive++)
780        add_disk(hd_gendisk[drive]);
781
782    return 0;
783
784out3:
785    release_region(HD_DATA, 8);
786out2:
787    free_irq(HD_IRQ, NULL);
788out1:
789    for (drive = 0; drive < NR_HD; drive++)
790        put_disk(hd_gendisk[drive]);
791    NR_HD = 0;
792out:
793    del_timer(&device_timer);
794    unregister_blkdev(HD_MAJOR, "hd");
795    blk_cleanup_queue(hd_queue);
796    return -1;
797Enomem:
798    while (drive--)
799        put_disk(hd_gendisk[drive]);
800    goto out;
801}
802
803static int __init parse_hd_setup(char *line)
804{
805    int ints[6];
806
807    (void) get_options(line, ARRAY_SIZE(ints), ints);
808    hd_setup(NULL, ints);
809
810    return 1;
811}
812__setup("hd=", parse_hd_setup);
813
814late_initcall(hd_init);
815

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