867 lines
20 KiB
C
867 lines
20 KiB
C
/*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*
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* This is the low-level hd interrupt support. It traverses the
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* request-list, using interrupts to jump between functions. As
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* all the functions are called within interrupts, we may not
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* sleep. Special care is recommended.
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*
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* modified by Drew Eckhardt to check nr of hd's from the CMOS.
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*
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* Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug
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* in the early extended-partition checks and added DM partitions
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*
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* IRQ-unmask, drive-id, multiple-mode, support for ">16 heads",
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* and general streamlining by Mark Lord.
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*
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* Removed 99% of above. Use Mark's ide driver for those options.
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* This is now a lightweight ST-506 driver. (Paul Gortmaker)
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*
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* Modified 1995 Russell King for ARM processor.
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*
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* Bugfix: max_sectors must be <= 255 or the wheels tend to come
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* off in a hurry once you queue things up - Paul G. 02/2001
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*/
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/* Uncomment the following if you want verbose error reports. */
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/* #define VERBOSE_ERRORS */
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#include <linux/blkdev.h>
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#include <linux/errno.h>
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#include <linux/signal.h>
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#include <linux/interrupt.h>
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#include <linux/timer.h>
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#include <linux/fs.h>
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#include <linux/kernel.h>
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#include <linux/genhd.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/ioport.h>
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#include <linux/mc146818rtc.h> /* CMOS defines */
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#include <linux/init.h>
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#include <linux/blkpg.h>
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#include <linux/hdreg.h>
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#define REALLY_SLOW_IO
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#include <asm/system.h>
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#include <asm/io.h>
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#include <asm/uaccess.h>
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#ifdef __arm__
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#undef HD_IRQ
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#endif
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#include <asm/irq.h>
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#ifdef __arm__
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#define HD_IRQ IRQ_HARDDISK
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#endif
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/* Hd controller regster ports */
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#define HD_DATA 0x1f0 /* _CTL when writing */
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#define HD_ERROR 0x1f1 /* see err-bits */
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#define HD_NSECTOR 0x1f2 /* nr of sectors to read/write */
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#define HD_SECTOR 0x1f3 /* starting sector */
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#define HD_LCYL 0x1f4 /* starting cylinder */
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#define HD_HCYL 0x1f5 /* high byte of starting cyl */
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#define HD_CURRENT 0x1f6 /* 101dhhhh , d=drive, hhhh=head */
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#define HD_STATUS 0x1f7 /* see status-bits */
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#define HD_FEATURE HD_ERROR /* same io address, read=error, write=feature */
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#define HD_PRECOMP HD_FEATURE /* obsolete use of this port - predates IDE */
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#define HD_COMMAND HD_STATUS /* same io address, read=status, write=cmd */
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#define HD_CMD 0x3f6 /* used for resets */
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#define HD_ALTSTATUS 0x3f6 /* same as HD_STATUS but doesn't clear irq */
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/* Bits of HD_STATUS */
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#define ERR_STAT 0x01
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#define INDEX_STAT 0x02
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#define ECC_STAT 0x04 /* Corrected error */
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#define DRQ_STAT 0x08
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#define SEEK_STAT 0x10
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#define SERVICE_STAT SEEK_STAT
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#define WRERR_STAT 0x20
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#define READY_STAT 0x40
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#define BUSY_STAT 0x80
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/* Bits for HD_ERROR */
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#define MARK_ERR 0x01 /* Bad address mark */
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#define TRK0_ERR 0x02 /* couldn't find track 0 */
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#define ABRT_ERR 0x04 /* Command aborted */
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#define MCR_ERR 0x08 /* media change request */
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#define ID_ERR 0x10 /* ID field not found */
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#define MC_ERR 0x20 /* media changed */
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#define ECC_ERR 0x40 /* Uncorrectable ECC error */
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#define BBD_ERR 0x80 /* pre-EIDE meaning: block marked bad */
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#define ICRC_ERR 0x80 /* new meaning: CRC error during transfer */
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static DEFINE_SPINLOCK(hd_lock);
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static struct request_queue *hd_queue;
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#define MAJOR_NR HD_MAJOR
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#define QUEUE (hd_queue)
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#define CURRENT elv_next_request(hd_queue)
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#define TIMEOUT_VALUE (6*HZ)
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#define HD_DELAY 0
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#define MAX_ERRORS 16 /* Max read/write errors/sector */
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#define RESET_FREQ 8 /* Reset controller every 8th retry */
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#define RECAL_FREQ 4 /* Recalibrate every 4th retry */
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#define MAX_HD 2
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#define STAT_OK (READY_STAT|SEEK_STAT)
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#define OK_STATUS(s) (((s)&(STAT_OK|(BUSY_STAT|WRERR_STAT|ERR_STAT)))==STAT_OK)
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static void recal_intr(void);
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static void bad_rw_intr(void);
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static int reset;
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static int hd_error;
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/*
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* This struct defines the HD's and their types.
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*/
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struct hd_i_struct {
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unsigned int head,sect,cyl,wpcom,lzone,ctl;
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int unit;
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int recalibrate;
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int special_op;
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};
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#ifdef HD_TYPE
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static struct hd_i_struct hd_info[] = { HD_TYPE };
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static int NR_HD = ((sizeof (hd_info))/(sizeof (struct hd_i_struct)));
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#else
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static struct hd_i_struct hd_info[MAX_HD];
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static int NR_HD;
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#endif
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static struct gendisk *hd_gendisk[MAX_HD];
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static struct timer_list device_timer;
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#define TIMEOUT_VALUE (6*HZ)
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#define SET_TIMER \
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do { \
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mod_timer(&device_timer, jiffies + TIMEOUT_VALUE); \
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} while (0)
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static void (*do_hd)(void) = NULL;
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#define SET_HANDLER(x) \
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if ((do_hd = (x)) != NULL) \
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SET_TIMER; \
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else \
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del_timer(&device_timer);
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#if (HD_DELAY > 0)
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#include <asm/i8253.h>
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unsigned long last_req;
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unsigned long read_timer(void)
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{
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unsigned long t, flags;
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int i;
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spin_lock_irqsave(&i8253_lock, flags);
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t = jiffies * 11932;
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outb_p(0, 0x43);
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i = inb_p(0x40);
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i |= inb(0x40) << 8;
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spin_unlock_irqrestore(&i8253_lock, flags);
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return(t - i);
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}
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#endif
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static void __init hd_setup(char *str, int *ints)
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{
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int hdind = 0;
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if (ints[0] != 3)
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return;
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if (hd_info[0].head != 0)
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hdind=1;
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hd_info[hdind].head = ints[2];
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hd_info[hdind].sect = ints[3];
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hd_info[hdind].cyl = ints[1];
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hd_info[hdind].wpcom = 0;
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hd_info[hdind].lzone = ints[1];
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hd_info[hdind].ctl = (ints[2] > 8 ? 8 : 0);
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NR_HD = hdind+1;
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}
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static void dump_status (const char *msg, unsigned int stat)
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{
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char *name = "hd?";
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if (CURRENT)
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name = CURRENT->rq_disk->disk_name;
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#ifdef VERBOSE_ERRORS
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printk("%s: %s: status=0x%02x { ", name, msg, stat & 0xff);
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if (stat & BUSY_STAT) printk("Busy ");
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if (stat & READY_STAT) printk("DriveReady ");
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if (stat & WRERR_STAT) printk("WriteFault ");
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if (stat & SEEK_STAT) printk("SeekComplete ");
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if (stat & DRQ_STAT) printk("DataRequest ");
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if (stat & ECC_STAT) printk("CorrectedError ");
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if (stat & INDEX_STAT) printk("Index ");
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if (stat & ERR_STAT) printk("Error ");
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printk("}\n");
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if ((stat & ERR_STAT) == 0) {
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hd_error = 0;
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} else {
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hd_error = inb(HD_ERROR);
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printk("%s: %s: error=0x%02x { ", name, msg, hd_error & 0xff);
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if (hd_error & BBD_ERR) printk("BadSector ");
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if (hd_error & ECC_ERR) printk("UncorrectableError ");
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if (hd_error & ID_ERR) printk("SectorIdNotFound ");
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if (hd_error & ABRT_ERR) printk("DriveStatusError ");
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if (hd_error & TRK0_ERR) printk("TrackZeroNotFound ");
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if (hd_error & MARK_ERR) printk("AddrMarkNotFound ");
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printk("}");
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if (hd_error & (BBD_ERR|ECC_ERR|ID_ERR|MARK_ERR)) {
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printk(", CHS=%d/%d/%d", (inb(HD_HCYL)<<8) + inb(HD_LCYL),
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inb(HD_CURRENT) & 0xf, inb(HD_SECTOR));
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if (CURRENT)
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printk(", sector=%ld", CURRENT->sector);
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}
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printk("\n");
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}
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#else
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printk("%s: %s: status=0x%02x.\n", name, msg, stat & 0xff);
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if ((stat & ERR_STAT) == 0) {
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hd_error = 0;
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} else {
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hd_error = inb(HD_ERROR);
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printk("%s: %s: error=0x%02x.\n", name, msg, hd_error & 0xff);
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}
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#endif
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}
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static void check_status(void)
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{
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int i = inb_p(HD_STATUS);
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if (!OK_STATUS(i)) {
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dump_status("check_status", i);
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bad_rw_intr();
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}
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}
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static int controller_busy(void)
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{
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int retries = 100000;
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unsigned char status;
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do {
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status = inb_p(HD_STATUS);
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} while ((status & BUSY_STAT) && --retries);
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return status;
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}
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static int status_ok(void)
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{
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unsigned char status = inb_p(HD_STATUS);
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if (status & BUSY_STAT)
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return 1; /* Ancient, but does it make sense??? */
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if (status & WRERR_STAT)
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return 0;
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if (!(status & READY_STAT))
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return 0;
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if (!(status & SEEK_STAT))
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return 0;
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return 1;
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}
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static int controller_ready(unsigned int drive, unsigned int head)
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{
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int retry = 100;
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do {
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if (controller_busy() & BUSY_STAT)
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return 0;
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outb_p(0xA0 | (drive<<4) | head, HD_CURRENT);
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if (status_ok())
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return 1;
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} while (--retry);
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return 0;
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}
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static void hd_out(struct hd_i_struct *disk,
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unsigned int nsect,
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unsigned int sect,
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unsigned int head,
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unsigned int cyl,
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unsigned int cmd,
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void (*intr_addr)(void))
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{
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unsigned short port;
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#if (HD_DELAY > 0)
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while (read_timer() - last_req < HD_DELAY)
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/* nothing */;
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#endif
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if (reset)
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return;
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if (!controller_ready(disk->unit, head)) {
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reset = 1;
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return;
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}
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SET_HANDLER(intr_addr);
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outb_p(disk->ctl,HD_CMD);
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port=HD_DATA;
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outb_p(disk->wpcom>>2,++port);
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outb_p(nsect,++port);
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outb_p(sect,++port);
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outb_p(cyl,++port);
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outb_p(cyl>>8,++port);
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outb_p(0xA0|(disk->unit<<4)|head,++port);
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outb_p(cmd,++port);
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}
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static void hd_request (void);
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static int drive_busy(void)
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{
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unsigned int i;
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unsigned char c;
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for (i = 0; i < 500000 ; i++) {
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c = inb_p(HD_STATUS);
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if ((c & (BUSY_STAT | READY_STAT | SEEK_STAT)) == STAT_OK)
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return 0;
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}
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dump_status("reset timed out", c);
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return 1;
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}
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static void reset_controller(void)
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{
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int i;
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outb_p(4,HD_CMD);
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for(i = 0; i < 1000; i++) barrier();
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outb_p(hd_info[0].ctl & 0x0f,HD_CMD);
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for(i = 0; i < 1000; i++) barrier();
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if (drive_busy())
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printk("hd: controller still busy\n");
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else if ((hd_error = inb(HD_ERROR)) != 1)
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printk("hd: controller reset failed: %02x\n",hd_error);
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}
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static void reset_hd(void)
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{
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static int i;
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repeat:
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if (reset) {
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reset = 0;
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i = -1;
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reset_controller();
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} else {
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check_status();
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if (reset)
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goto repeat;
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}
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if (++i < NR_HD) {
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struct hd_i_struct *disk = &hd_info[i];
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disk->special_op = disk->recalibrate = 1;
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hd_out(disk,disk->sect,disk->sect,disk->head-1,
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disk->cyl,WIN_SPECIFY,&reset_hd);
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if (reset)
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goto repeat;
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} else
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hd_request();
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}
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/*
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* Ok, don't know what to do with the unexpected interrupts: on some machines
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* doing a reset and a retry seems to result in an eternal loop. Right now I
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* ignore it, and just set the timeout.
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*
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* On laptops (and "green" PCs), an unexpected interrupt occurs whenever the
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* drive enters "idle", "standby", or "sleep" mode, so if the status looks
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* "good", we just ignore the interrupt completely.
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*/
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static void unexpected_hd_interrupt(void)
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{
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unsigned int stat = inb_p(HD_STATUS);
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if (stat & (BUSY_STAT|DRQ_STAT|ECC_STAT|ERR_STAT)) {
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dump_status ("unexpected interrupt", stat);
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SET_TIMER;
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}
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}
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/*
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* bad_rw_intr() now tries to be a bit smarter and does things
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* according to the error returned by the controller.
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* -Mika Liljeberg (liljeber@cs.Helsinki.FI)
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*/
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static void bad_rw_intr(void)
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{
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struct request *req = CURRENT;
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if (req != NULL) {
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struct hd_i_struct *disk = req->rq_disk->private_data;
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if (++req->errors >= MAX_ERRORS || (hd_error & BBD_ERR)) {
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end_request(req, 0);
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disk->special_op = disk->recalibrate = 1;
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} else if (req->errors % RESET_FREQ == 0)
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reset = 1;
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else if ((hd_error & TRK0_ERR) || req->errors % RECAL_FREQ == 0)
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disk->special_op = disk->recalibrate = 1;
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/* Otherwise just retry */
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}
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}
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static inline int wait_DRQ(void)
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{
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int retries = 100000, stat;
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while (--retries > 0)
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if ((stat = inb_p(HD_STATUS)) & DRQ_STAT)
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return 0;
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dump_status("wait_DRQ", stat);
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return -1;
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}
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static void read_intr(void)
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{
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struct request *req;
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int i, retries = 100000;
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do {
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i = (unsigned) inb_p(HD_STATUS);
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if (i & BUSY_STAT)
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continue;
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if (!OK_STATUS(i))
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break;
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if (i & DRQ_STAT)
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goto ok_to_read;
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} while (--retries > 0);
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dump_status("read_intr", i);
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bad_rw_intr();
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hd_request();
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return;
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ok_to_read:
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req = CURRENT;
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insw(HD_DATA,req->buffer,256);
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req->sector++;
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req->buffer += 512;
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req->errors = 0;
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i = --req->nr_sectors;
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--req->current_nr_sectors;
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#ifdef DEBUG
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printk("%s: read: sector %ld, remaining = %ld, buffer=%p\n",
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req->rq_disk->disk_name, req->sector, req->nr_sectors,
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req->buffer+512));
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#endif
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if (req->current_nr_sectors <= 0)
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end_request(req, 1);
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if (i > 0) {
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SET_HANDLER(&read_intr);
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return;
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}
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(void) inb_p(HD_STATUS);
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#if (HD_DELAY > 0)
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last_req = read_timer();
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#endif
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if (elv_next_request(QUEUE))
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hd_request();
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return;
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}
|
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|
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static void write_intr(void)
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{
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struct request *req = CURRENT;
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int i;
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int retries = 100000;
|
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|
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do {
|
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i = (unsigned) inb_p(HD_STATUS);
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if (i & BUSY_STAT)
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continue;
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if (!OK_STATUS(i))
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break;
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if ((req->nr_sectors <= 1) || (i & DRQ_STAT))
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goto ok_to_write;
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} while (--retries > 0);
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dump_status("write_intr", i);
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bad_rw_intr();
|
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hd_request();
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return;
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ok_to_write:
|
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req->sector++;
|
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i = --req->nr_sectors;
|
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--req->current_nr_sectors;
|
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req->buffer += 512;
|
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if (!i || (req->bio && req->current_nr_sectors <= 0))
|
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end_request(req, 1);
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if (i > 0) {
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SET_HANDLER(&write_intr);
|
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outsw(HD_DATA,req->buffer,256);
|
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local_irq_enable();
|
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} else {
|
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#if (HD_DELAY > 0)
|
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last_req = read_timer();
|
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#endif
|
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hd_request();
|
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}
|
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return;
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}
|
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|
|
static void recal_intr(void)
|
|
{
|
|
check_status();
|
|
#if (HD_DELAY > 0)
|
|
last_req = read_timer();
|
|
#endif
|
|
hd_request();
|
|
}
|
|
|
|
/*
|
|
* This is another of the error-routines I don't know what to do with. The
|
|
* best idea seems to just set reset, and start all over again.
|
|
*/
|
|
static void hd_times_out(unsigned long dummy)
|
|
{
|
|
char *name;
|
|
|
|
do_hd = NULL;
|
|
|
|
if (!CURRENT)
|
|
return;
|
|
|
|
disable_irq(HD_IRQ);
|
|
local_irq_enable();
|
|
reset = 1;
|
|
name = CURRENT->rq_disk->disk_name;
|
|
printk("%s: timeout\n", name);
|
|
if (++CURRENT->errors >= MAX_ERRORS) {
|
|
#ifdef DEBUG
|
|
printk("%s: too many errors\n", name);
|
|
#endif
|
|
end_request(CURRENT, 0);
|
|
}
|
|
local_irq_disable();
|
|
hd_request();
|
|
enable_irq(HD_IRQ);
|
|
}
|
|
|
|
static int do_special_op(struct hd_i_struct *disk, struct request *req)
|
|
{
|
|
if (disk->recalibrate) {
|
|
disk->recalibrate = 0;
|
|
hd_out(disk,disk->sect,0,0,0,WIN_RESTORE,&recal_intr);
|
|
return reset;
|
|
}
|
|
if (disk->head > 16) {
|
|
printk ("%s: cannot handle device with more than 16 heads - giving up\n", req->rq_disk->disk_name);
|
|
end_request(req, 0);
|
|
}
|
|
disk->special_op = 0;
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* The driver enables interrupts as much as possible. In order to do this,
|
|
* (a) the device-interrupt is disabled before entering hd_request(),
|
|
* and (b) the timeout-interrupt is disabled before the sti().
|
|
*
|
|
* Interrupts are still masked (by default) whenever we are exchanging
|
|
* data/cmds with a drive, because some drives seem to have very poor
|
|
* tolerance for latency during I/O. The IDE driver has support to unmask
|
|
* interrupts for non-broken hardware, so use that driver if required.
|
|
*/
|
|
static void hd_request(void)
|
|
{
|
|
unsigned int block, nsect, sec, track, head, cyl;
|
|
struct hd_i_struct *disk;
|
|
struct request *req;
|
|
|
|
if (do_hd)
|
|
return;
|
|
repeat:
|
|
del_timer(&device_timer);
|
|
local_irq_enable();
|
|
|
|
req = CURRENT;
|
|
if (!req) {
|
|
do_hd = NULL;
|
|
return;
|
|
}
|
|
|
|
if (reset) {
|
|
local_irq_disable();
|
|
reset_hd();
|
|
return;
|
|
}
|
|
disk = req->rq_disk->private_data;
|
|
block = req->sector;
|
|
nsect = req->nr_sectors;
|
|
if (block >= get_capacity(req->rq_disk) ||
|
|
((block+nsect) > get_capacity(req->rq_disk))) {
|
|
printk("%s: bad access: block=%d, count=%d\n",
|
|
req->rq_disk->disk_name, block, nsect);
|
|
end_request(req, 0);
|
|
goto repeat;
|
|
}
|
|
|
|
if (disk->special_op) {
|
|
if (do_special_op(disk, req))
|
|
goto repeat;
|
|
return;
|
|
}
|
|
sec = block % disk->sect + 1;
|
|
track = block / disk->sect;
|
|
head = track % disk->head;
|
|
cyl = track / disk->head;
|
|
#ifdef DEBUG
|
|
printk("%s: %sing: CHS=%d/%d/%d, sectors=%d, buffer=%p\n",
|
|
req->rq_disk->disk_name, (req->cmd == READ)?"read":"writ",
|
|
cyl, head, sec, nsect, req->buffer);
|
|
#endif
|
|
if (req->flags & REQ_CMD) {
|
|
switch (rq_data_dir(req)) {
|
|
case READ:
|
|
hd_out(disk,nsect,sec,head,cyl,WIN_READ,&read_intr);
|
|
if (reset)
|
|
goto repeat;
|
|
break;
|
|
case WRITE:
|
|
hd_out(disk,nsect,sec,head,cyl,WIN_WRITE,&write_intr);
|
|
if (reset)
|
|
goto repeat;
|
|
if (wait_DRQ()) {
|
|
bad_rw_intr();
|
|
goto repeat;
|
|
}
|
|
outsw(HD_DATA,req->buffer,256);
|
|
break;
|
|
default:
|
|
printk("unknown hd-command\n");
|
|
end_request(req, 0);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void do_hd_request (request_queue_t * q)
|
|
{
|
|
disable_irq(HD_IRQ);
|
|
hd_request();
|
|
enable_irq(HD_IRQ);
|
|
}
|
|
|
|
static int hd_ioctl(struct inode * inode, struct file * file,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct hd_i_struct *disk = inode->i_bdev->bd_disk->private_data;
|
|
struct hd_geometry __user *loc = (struct hd_geometry __user *) arg;
|
|
struct hd_geometry g;
|
|
|
|
if (cmd != HDIO_GETGEO)
|
|
return -EINVAL;
|
|
if (!loc)
|
|
return -EINVAL;
|
|
g.heads = disk->head;
|
|
g.sectors = disk->sect;
|
|
g.cylinders = disk->cyl;
|
|
g.start = get_start_sect(inode->i_bdev);
|
|
return copy_to_user(loc, &g, sizeof g) ? -EFAULT : 0;
|
|
}
|
|
|
|
/*
|
|
* Releasing a block device means we sync() it, so that it can safely
|
|
* be forgotten about...
|
|
*/
|
|
|
|
static irqreturn_t hd_interrupt(int irq, void *dev_id, struct pt_regs *regs)
|
|
{
|
|
void (*handler)(void) = do_hd;
|
|
|
|
do_hd = NULL;
|
|
del_timer(&device_timer);
|
|
if (!handler)
|
|
handler = unexpected_hd_interrupt;
|
|
handler();
|
|
local_irq_enable();
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static struct block_device_operations hd_fops = {
|
|
.ioctl = hd_ioctl,
|
|
};
|
|
|
|
/*
|
|
* This is the hard disk IRQ description. The SA_INTERRUPT in sa_flags
|
|
* means we run the IRQ-handler with interrupts disabled: this is bad for
|
|
* interrupt latency, but anything else has led to problems on some
|
|
* machines.
|
|
*
|
|
* We enable interrupts in some of the routines after making sure it's
|
|
* safe.
|
|
*/
|
|
|
|
static int __init hd_init(void)
|
|
{
|
|
int drive;
|
|
|
|
if (register_blkdev(MAJOR_NR,"hd"))
|
|
return -1;
|
|
|
|
hd_queue = blk_init_queue(do_hd_request, &hd_lock);
|
|
if (!hd_queue) {
|
|
unregister_blkdev(MAJOR_NR,"hd");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
blk_queue_max_sectors(hd_queue, 255);
|
|
init_timer(&device_timer);
|
|
device_timer.function = hd_times_out;
|
|
blk_queue_hardsect_size(hd_queue, 512);
|
|
|
|
#ifdef __i386__
|
|
if (!NR_HD) {
|
|
extern struct drive_info drive_info;
|
|
unsigned char *BIOS = (unsigned char *) &drive_info;
|
|
unsigned long flags;
|
|
int cmos_disks;
|
|
|
|
for (drive=0 ; drive<2 ; drive++) {
|
|
hd_info[drive].cyl = *(unsigned short *) BIOS;
|
|
hd_info[drive].head = *(2+BIOS);
|
|
hd_info[drive].wpcom = *(unsigned short *) (5+BIOS);
|
|
hd_info[drive].ctl = *(8+BIOS);
|
|
hd_info[drive].lzone = *(unsigned short *) (12+BIOS);
|
|
hd_info[drive].sect = *(14+BIOS);
|
|
#ifdef does_not_work_for_everybody_with_scsi_but_helps_ibm_vp
|
|
if (hd_info[drive].cyl && NR_HD == drive)
|
|
NR_HD++;
|
|
#endif
|
|
BIOS += 16;
|
|
}
|
|
|
|
/*
|
|
We query CMOS about hard disks : it could be that
|
|
we have a SCSI/ESDI/etc controller that is BIOS
|
|
compatible with ST-506, and thus showing up in our
|
|
BIOS table, but not register compatible, and therefore
|
|
not present in CMOS.
|
|
|
|
Furthermore, we will assume that our ST-506 drives
|
|
<if any> are the primary drives in the system, and
|
|
the ones reflected as drive 1 or 2.
|
|
|
|
The first drive is stored in the high nibble of CMOS
|
|
byte 0x12, the second in the low nibble. This will be
|
|
either a 4 bit drive type or 0xf indicating use byte 0x19
|
|
for an 8 bit type, drive 1, 0x1a for drive 2 in CMOS.
|
|
|
|
Needless to say, a non-zero value means we have
|
|
an AT controller hard disk for that drive.
|
|
|
|
Currently the rtc_lock is a bit academic since this
|
|
driver is non-modular, but someday... ? Paul G.
|
|
*/
|
|
|
|
spin_lock_irqsave(&rtc_lock, flags);
|
|
cmos_disks = CMOS_READ(0x12);
|
|
spin_unlock_irqrestore(&rtc_lock, flags);
|
|
|
|
if (cmos_disks & 0xf0) {
|
|
if (cmos_disks & 0x0f)
|
|
NR_HD = 2;
|
|
else
|
|
NR_HD = 1;
|
|
}
|
|
}
|
|
#endif /* __i386__ */
|
|
#ifdef __arm__
|
|
if (!NR_HD) {
|
|
/* We don't know anything about the drive. This means
|
|
* that you *MUST* specify the drive parameters to the
|
|
* kernel yourself.
|
|
*/
|
|
printk("hd: no drives specified - use hd=cyl,head,sectors"
|
|
" on kernel command line\n");
|
|
}
|
|
#endif
|
|
if (!NR_HD)
|
|
goto out;
|
|
|
|
for (drive=0 ; drive < NR_HD ; drive++) {
|
|
struct gendisk *disk = alloc_disk(64);
|
|
struct hd_i_struct *p = &hd_info[drive];
|
|
if (!disk)
|
|
goto Enomem;
|
|
disk->major = MAJOR_NR;
|
|
disk->first_minor = drive << 6;
|
|
disk->fops = &hd_fops;
|
|
sprintf(disk->disk_name, "hd%c", 'a'+drive);
|
|
disk->private_data = p;
|
|
set_capacity(disk, p->head * p->sect * p->cyl);
|
|
disk->queue = hd_queue;
|
|
p->unit = drive;
|
|
hd_gendisk[drive] = disk;
|
|
printk ("%s: %luMB, CHS=%d/%d/%d\n",
|
|
disk->disk_name, (unsigned long)get_capacity(disk)/2048,
|
|
p->cyl, p->head, p->sect);
|
|
}
|
|
|
|
if (request_irq(HD_IRQ, hd_interrupt, SA_INTERRUPT, "hd", NULL)) {
|
|
printk("hd: unable to get IRQ%d for the hard disk driver\n",
|
|
HD_IRQ);
|
|
goto out1;
|
|
}
|
|
if (!request_region(HD_DATA, 8, "hd")) {
|
|
printk(KERN_WARNING "hd: port 0x%x busy\n", HD_DATA);
|
|
goto out2;
|
|
}
|
|
if (!request_region(HD_CMD, 1, "hd(cmd)")) {
|
|
printk(KERN_WARNING "hd: port 0x%x busy\n", HD_CMD);
|
|
goto out3;
|
|
}
|
|
|
|
/* Let them fly */
|
|
for(drive=0; drive < NR_HD; drive++)
|
|
add_disk(hd_gendisk[drive]);
|
|
|
|
return 0;
|
|
|
|
out3:
|
|
release_region(HD_DATA, 8);
|
|
out2:
|
|
free_irq(HD_IRQ, NULL);
|
|
out1:
|
|
for (drive = 0; drive < NR_HD; drive++)
|
|
put_disk(hd_gendisk[drive]);
|
|
NR_HD = 0;
|
|
out:
|
|
del_timer(&device_timer);
|
|
unregister_blkdev(MAJOR_NR,"hd");
|
|
blk_cleanup_queue(hd_queue);
|
|
return -1;
|
|
Enomem:
|
|
while (drive--)
|
|
put_disk(hd_gendisk[drive]);
|
|
goto out;
|
|
}
|
|
|
|
static int __init parse_hd_setup (char *line) {
|
|
int ints[6];
|
|
|
|
(void) get_options(line, ARRAY_SIZE(ints), ints);
|
|
hd_setup(NULL, ints);
|
|
|
|
return 1;
|
|
}
|
|
__setup("hd=", parse_hd_setup);
|
|
|
|
module_init(hd_init);
|