| /* |
| * Copyright (C) 1991, 1992 Linus Torvalds |
| * |
| * This is the low-level hd interrupt support. It traverses the |
| * request-list, using interrupts to jump between functions. As |
| * all the functions are called within interrupts, we may not |
| * sleep. Special care is recommended. |
| * |
| * modified by Drew Eckhardt to check nr of hd's from the CMOS. |
| * |
| * Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug |
| * in the early extended-partition checks and added DM partitions |
| * |
| * IRQ-unmask, drive-id, multiple-mode, support for ">16 heads", |
| * and general streamlining by Mark Lord. |
| * |
| * Removed 99% of above. Use Mark's ide driver for those options. |
| * This is now a lightweight ST-506 driver. (Paul Gortmaker) |
| * |
| * Modified 1995 Russell King for ARM processor. |
| * |
| * Bugfix: max_sectors must be <= 255 or the wheels tend to come |
| * off in a hurry once you queue things up - Paul G. 02/2001 |
| */ |
| |
| /* Uncomment the following if you want verbose error reports. */ |
| /* #define VERBOSE_ERRORS */ |
| |
| #include <linux/blkdev.h> |
| #include <linux/errno.h> |
| #include <linux/signal.h> |
| #include <linux/interrupt.h> |
| #include <linux/timer.h> |
| #include <linux/fs.h> |
| #include <linux/kernel.h> |
| #include <linux/genhd.h> |
| #include <linux/slab.h> |
| #include <linux/string.h> |
| #include <linux/ioport.h> |
| #include <linux/mc146818rtc.h> /* CMOS defines */ |
| #include <linux/init.h> |
| #include <linux/blkpg.h> |
| #include <linux/hdreg.h> |
| |
| #define REALLY_SLOW_IO |
| #include <asm/system.h> |
| #include <asm/io.h> |
| #include <asm/uaccess.h> |
| |
| #ifdef __arm__ |
| #undef HD_IRQ |
| #endif |
| #include <asm/irq.h> |
| #ifdef __arm__ |
| #define HD_IRQ IRQ_HARDDISK |
| #endif |
| |
| /* Hd controller regster ports */ |
| |
| #define HD_DATA 0x1f0 /* _CTL when writing */ |
| #define HD_ERROR 0x1f1 /* see err-bits */ |
| #define HD_NSECTOR 0x1f2 /* nr of sectors to read/write */ |
| #define HD_SECTOR 0x1f3 /* starting sector */ |
| #define HD_LCYL 0x1f4 /* starting cylinder */ |
| #define HD_HCYL 0x1f5 /* high byte of starting cyl */ |
| #define HD_CURRENT 0x1f6 /* 101dhhhh , d=drive, hhhh=head */ |
| #define HD_STATUS 0x1f7 /* see status-bits */ |
| #define HD_FEATURE HD_ERROR /* same io address, read=error, write=feature */ |
| #define HD_PRECOMP HD_FEATURE /* obsolete use of this port - predates IDE */ |
| #define HD_COMMAND HD_STATUS /* same io address, read=status, write=cmd */ |
| |
| #define HD_CMD 0x3f6 /* used for resets */ |
| #define HD_ALTSTATUS 0x3f6 /* same as HD_STATUS but doesn't clear irq */ |
| |
| /* Bits of HD_STATUS */ |
| #define ERR_STAT 0x01 |
| #define INDEX_STAT 0x02 |
| #define ECC_STAT 0x04 /* Corrected error */ |
| #define DRQ_STAT 0x08 |
| #define SEEK_STAT 0x10 |
| #define SERVICE_STAT SEEK_STAT |
| #define WRERR_STAT 0x20 |
| #define READY_STAT 0x40 |
| #define BUSY_STAT 0x80 |
| |
| /* Bits for HD_ERROR */ |
| #define MARK_ERR 0x01 /* Bad address mark */ |
| #define TRK0_ERR 0x02 /* couldn't find track 0 */ |
| #define ABRT_ERR 0x04 /* Command aborted */ |
| #define MCR_ERR 0x08 /* media change request */ |
| #define ID_ERR 0x10 /* ID field not found */ |
| #define MC_ERR 0x20 /* media changed */ |
| #define ECC_ERR 0x40 /* Uncorrectable ECC error */ |
| #define BBD_ERR 0x80 /* pre-EIDE meaning: block marked bad */ |
| #define ICRC_ERR 0x80 /* new meaning: CRC error during transfer */ |
| |
| static DEFINE_SPINLOCK(hd_lock); |
| static struct request_queue *hd_queue; |
| |
| #define MAJOR_NR HD_MAJOR |
| #define QUEUE (hd_queue) |
| #define CURRENT elv_next_request(hd_queue) |
| |
| #define TIMEOUT_VALUE (6*HZ) |
| #define HD_DELAY 0 |
| |
| #define MAX_ERRORS 16 /* Max read/write errors/sector */ |
| #define RESET_FREQ 8 /* Reset controller every 8th retry */ |
| #define RECAL_FREQ 4 /* Recalibrate every 4th retry */ |
| #define MAX_HD 2 |
| |
| #define STAT_OK (READY_STAT|SEEK_STAT) |
| #define OK_STATUS(s) (((s)&(STAT_OK|(BUSY_STAT|WRERR_STAT|ERR_STAT)))==STAT_OK) |
| |
| static void recal_intr(void); |
| static void bad_rw_intr(void); |
| |
| static int reset; |
| static int hd_error; |
| |
| /* |
| * This struct defines the HD's and their types. |
| */ |
| struct hd_i_struct { |
| unsigned int head,sect,cyl,wpcom,lzone,ctl; |
| int unit; |
| int recalibrate; |
| int special_op; |
| }; |
| |
| #ifdef HD_TYPE |
| static struct hd_i_struct hd_info[] = { HD_TYPE }; |
| static int NR_HD = ((sizeof (hd_info))/(sizeof (struct hd_i_struct))); |
| #else |
| static struct hd_i_struct hd_info[MAX_HD]; |
| static int NR_HD; |
| #endif |
| |
| static struct gendisk *hd_gendisk[MAX_HD]; |
| |
| static struct timer_list device_timer; |
| |
| #define TIMEOUT_VALUE (6*HZ) |
| |
| #define SET_TIMER \ |
| do { \ |
| mod_timer(&device_timer, jiffies + TIMEOUT_VALUE); \ |
| } while (0) |
| |
| static void (*do_hd)(void) = NULL; |
| #define SET_HANDLER(x) \ |
| if ((do_hd = (x)) != NULL) \ |
| SET_TIMER; \ |
| else \ |
| del_timer(&device_timer); |
| |
| |
| #if (HD_DELAY > 0) |
| |
| #include <asm/i8253.h> |
| |
| unsigned long last_req; |
| |
| unsigned long read_timer(void) |
| { |
| unsigned long t, flags; |
| int i; |
| |
| spin_lock_irqsave(&i8253_lock, flags); |
| t = jiffies * 11932; |
| outb_p(0, 0x43); |
| i = inb_p(0x40); |
| i |= inb(0x40) << 8; |
| spin_unlock_irqrestore(&i8253_lock, flags); |
| return(t - i); |
| } |
| #endif |
| |
| static void __init hd_setup(char *str, int *ints) |
| { |
| int hdind = 0; |
| |
| if (ints[0] != 3) |
| return; |
| if (hd_info[0].head != 0) |
| hdind=1; |
| hd_info[hdind].head = ints[2]; |
| hd_info[hdind].sect = ints[3]; |
| hd_info[hdind].cyl = ints[1]; |
| hd_info[hdind].wpcom = 0; |
| hd_info[hdind].lzone = ints[1]; |
| hd_info[hdind].ctl = (ints[2] > 8 ? 8 : 0); |
| NR_HD = hdind+1; |
| } |
| |
| static void dump_status (const char *msg, unsigned int stat) |
| { |
| char *name = "hd?"; |
| if (CURRENT) |
| name = CURRENT->rq_disk->disk_name; |
| |
| #ifdef VERBOSE_ERRORS |
| printk("%s: %s: status=0x%02x { ", name, msg, stat & 0xff); |
| if (stat & BUSY_STAT) printk("Busy "); |
| if (stat & READY_STAT) printk("DriveReady "); |
| if (stat & WRERR_STAT) printk("WriteFault "); |
| if (stat & SEEK_STAT) printk("SeekComplete "); |
| if (stat & DRQ_STAT) printk("DataRequest "); |
| if (stat & ECC_STAT) printk("CorrectedError "); |
| if (stat & INDEX_STAT) printk("Index "); |
| if (stat & ERR_STAT) printk("Error "); |
| printk("}\n"); |
| if ((stat & ERR_STAT) == 0) { |
| hd_error = 0; |
| } else { |
| hd_error = inb(HD_ERROR); |
| printk("%s: %s: error=0x%02x { ", name, msg, hd_error & 0xff); |
| if (hd_error & BBD_ERR) printk("BadSector "); |
| if (hd_error & ECC_ERR) printk("UncorrectableError "); |
| if (hd_error & ID_ERR) printk("SectorIdNotFound "); |
| if (hd_error & ABRT_ERR) printk("DriveStatusError "); |
| if (hd_error & TRK0_ERR) printk("TrackZeroNotFound "); |
| if (hd_error & MARK_ERR) printk("AddrMarkNotFound "); |
| printk("}"); |
| if (hd_error & (BBD_ERR|ECC_ERR|ID_ERR|MARK_ERR)) { |
| printk(", CHS=%d/%d/%d", (inb(HD_HCYL)<<8) + inb(HD_LCYL), |
| inb(HD_CURRENT) & 0xf, inb(HD_SECTOR)); |
| if (CURRENT) |
| printk(", sector=%ld", CURRENT->sector); |
| } |
| printk("\n"); |
| } |
| #else |
| printk("%s: %s: status=0x%02x.\n", name, msg, stat & 0xff); |
| if ((stat & ERR_STAT) == 0) { |
| hd_error = 0; |
| } else { |
| hd_error = inb(HD_ERROR); |
| printk("%s: %s: error=0x%02x.\n", name, msg, hd_error & 0xff); |
| } |
| #endif |
| } |
| |
| static void check_status(void) |
| { |
| int i = inb_p(HD_STATUS); |
| |
| if (!OK_STATUS(i)) { |
| dump_status("check_status", i); |
| bad_rw_intr(); |
| } |
| } |
| |
| static int controller_busy(void) |
| { |
| int retries = 100000; |
| unsigned char status; |
| |
| do { |
| status = inb_p(HD_STATUS); |
| } while ((status & BUSY_STAT) && --retries); |
| return status; |
| } |
| |
| static int status_ok(void) |
| { |
| unsigned char status = inb_p(HD_STATUS); |
| |
| if (status & BUSY_STAT) |
| return 1; /* Ancient, but does it make sense??? */ |
| if (status & WRERR_STAT) |
| return 0; |
| if (!(status & READY_STAT)) |
| return 0; |
| if (!(status & SEEK_STAT)) |
| return 0; |
| return 1; |
| } |
| |
| static int controller_ready(unsigned int drive, unsigned int head) |
| { |
| int retry = 100; |
| |
| do { |
| if (controller_busy() & BUSY_STAT) |
| return 0; |
| outb_p(0xA0 | (drive<<4) | head, HD_CURRENT); |
| if (status_ok()) |
| return 1; |
| } while (--retry); |
| return 0; |
| } |
| |
| |
| static void hd_out(struct hd_i_struct *disk, |
| unsigned int nsect, |
| unsigned int sect, |
| unsigned int head, |
| unsigned int cyl, |
| unsigned int cmd, |
| void (*intr_addr)(void)) |
| { |
| unsigned short port; |
| |
| #if (HD_DELAY > 0) |
| while (read_timer() - last_req < HD_DELAY) |
| /* nothing */; |
| #endif |
| if (reset) |
| return; |
| if (!controller_ready(disk->unit, head)) { |
| reset = 1; |
| return; |
| } |
| SET_HANDLER(intr_addr); |
| outb_p(disk->ctl,HD_CMD); |
| port=HD_DATA; |
| outb_p(disk->wpcom>>2,++port); |
| outb_p(nsect,++port); |
| outb_p(sect,++port); |
| outb_p(cyl,++port); |
| outb_p(cyl>>8,++port); |
| outb_p(0xA0|(disk->unit<<4)|head,++port); |
| outb_p(cmd,++port); |
| } |
| |
| static void hd_request (void); |
| |
| static int drive_busy(void) |
| { |
| unsigned int i; |
| unsigned char c; |
| |
| for (i = 0; i < 500000 ; i++) { |
| c = inb_p(HD_STATUS); |
| if ((c & (BUSY_STAT | READY_STAT | SEEK_STAT)) == STAT_OK) |
| return 0; |
| } |
| dump_status("reset timed out", c); |
| return 1; |
| } |
| |
| static void reset_controller(void) |
| { |
| int i; |
| |
| outb_p(4,HD_CMD); |
| for(i = 0; i < 1000; i++) barrier(); |
| outb_p(hd_info[0].ctl & 0x0f,HD_CMD); |
| for(i = 0; i < 1000; i++) barrier(); |
| if (drive_busy()) |
| printk("hd: controller still busy\n"); |
| else if ((hd_error = inb(HD_ERROR)) != 1) |
| printk("hd: controller reset failed: %02x\n",hd_error); |
| } |
| |
| static void reset_hd(void) |
| { |
| static int i; |
| |
| repeat: |
| if (reset) { |
| reset = 0; |
| i = -1; |
| reset_controller(); |
| } else { |
| check_status(); |
| if (reset) |
| goto repeat; |
| } |
| if (++i < NR_HD) { |
| struct hd_i_struct *disk = &hd_info[i]; |
| disk->special_op = disk->recalibrate = 1; |
| hd_out(disk,disk->sect,disk->sect,disk->head-1, |
| disk->cyl,WIN_SPECIFY,&reset_hd); |
| if (reset) |
| goto repeat; |
| } else |
| hd_request(); |
| } |
| |
| /* |
| * Ok, don't know what to do with the unexpected interrupts: on some machines |
| * doing a reset and a retry seems to result in an eternal loop. Right now I |
| * ignore it, and just set the timeout. |
| * |
| * On laptops (and "green" PCs), an unexpected interrupt occurs whenever the |
| * drive enters "idle", "standby", or "sleep" mode, so if the status looks |
| * "good", we just ignore the interrupt completely. |
| */ |
| static void unexpected_hd_interrupt(void) |
| { |
| unsigned int stat = inb_p(HD_STATUS); |
| |
| if (stat & (BUSY_STAT|DRQ_STAT|ECC_STAT|ERR_STAT)) { |
| dump_status ("unexpected interrupt", stat); |
| SET_TIMER; |
| } |
| } |
| |
| /* |
| * bad_rw_intr() now tries to be a bit smarter and does things |
| * according to the error returned by the controller. |
| * -Mika Liljeberg (liljeber@cs.Helsinki.FI) |
| */ |
| static void bad_rw_intr(void) |
| { |
| struct request *req = CURRENT; |
| if (req != NULL) { |
| struct hd_i_struct *disk = req->rq_disk->private_data; |
| if (++req->errors >= MAX_ERRORS || (hd_error & BBD_ERR)) { |
| end_request(req, 0); |
| disk->special_op = disk->recalibrate = 1; |
| } else if (req->errors % RESET_FREQ == 0) |
| reset = 1; |
| else if ((hd_error & TRK0_ERR) || req->errors % RECAL_FREQ == 0) |
| disk->special_op = disk->recalibrate = 1; |
| /* Otherwise just retry */ |
| } |
| } |
| |
| static inline int wait_DRQ(void) |
| { |
| int retries = 100000, stat; |
| |
| while (--retries > 0) |
| if ((stat = inb_p(HD_STATUS)) & DRQ_STAT) |
| return 0; |
| dump_status("wait_DRQ", stat); |
| return -1; |
| } |
| |
| static void read_intr(void) |
| { |
| struct request *req; |
| int i, retries = 100000; |
| |
| do { |
| i = (unsigned) inb_p(HD_STATUS); |
| if (i & BUSY_STAT) |
| continue; |
| if (!OK_STATUS(i)) |
| break; |
| if (i & DRQ_STAT) |
| goto ok_to_read; |
| } while (--retries > 0); |
| dump_status("read_intr", i); |
| bad_rw_intr(); |
| hd_request(); |
| return; |
| ok_to_read: |
| req = CURRENT; |
| insw(HD_DATA,req->buffer,256); |
| req->sector++; |
| req->buffer += 512; |
| req->errors = 0; |
| i = --req->nr_sectors; |
| --req->current_nr_sectors; |
| #ifdef DEBUG |
| printk("%s: read: sector %ld, remaining = %ld, buffer=%p\n", |
| req->rq_disk->disk_name, req->sector, req->nr_sectors, |
| req->buffer+512)); |
| #endif |
| if (req->current_nr_sectors <= 0) |
| end_request(req, 1); |
| if (i > 0) { |
| SET_HANDLER(&read_intr); |
| return; |
| } |
| (void) inb_p(HD_STATUS); |
| #if (HD_DELAY > 0) |
| last_req = read_timer(); |
| #endif |
| if (elv_next_request(QUEUE)) |
| hd_request(); |
| return; |
| } |
| |
| static void write_intr(void) |
| { |
| struct request *req = CURRENT; |
| int i; |
| int retries = 100000; |
| |
| do { |
| i = (unsigned) inb_p(HD_STATUS); |
| if (i & BUSY_STAT) |
| continue; |
| if (!OK_STATUS(i)) |
| break; |
| if ((req->nr_sectors <= 1) || (i & DRQ_STAT)) |
| goto ok_to_write; |
| } while (--retries > 0); |
| dump_status("write_intr", i); |
| bad_rw_intr(); |
| hd_request(); |
| return; |
| ok_to_write: |
| req->sector++; |
| i = --req->nr_sectors; |
| --req->current_nr_sectors; |
| req->buffer += 512; |
| if (!i || (req->bio && req->current_nr_sectors <= 0)) |
| end_request(req, 1); |
| if (i > 0) { |
| SET_HANDLER(&write_intr); |
| outsw(HD_DATA,req->buffer,256); |
| local_irq_enable(); |
| } else { |
| #if (HD_DELAY > 0) |
| last_req = read_timer(); |
| #endif |
| hd_request(); |
| } |
| return; |
| } |
| |
| 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); |