* [3/5] move ide/legacy/hd.c to drivers/block/
2008-06-22 13:21 ` Bartlomiej Zolnierkiewicz
` (2 preceding siblings ...)
2008-06-24 21:54 ` [2/5] ide/legacy/hd.c: use late_initcall() Adrian Bunk
@ 2008-06-24 21:54 ` Adrian Bunk
2008-06-24 21:55 ` [4/5] update the BLK_DEV_HD help text Adrian Bunk
2008-06-24 22:05 ` [5/5] hd.c: remove the #include <linux/mc146818rtc.h> Adrian Bunk
5 siblings, 0 replies; 11+ messages in thread
From: Adrian Bunk @ 2008-06-24 21:54 UTC (permalink / raw)
To: Bartlomiej Zolnierkiewicz; +Cc: linux-ide, linux-kernel, rmk, Alan Cox
This patch moves hd.c to drivers/block/
Signed-off-by: Adrian Bunk <bunk@kernel.org>
---
drivers/block/Kconfig | 24 ++++++++++++++++++++++++
drivers/block/Makefile | 1 +
drivers/{ide/legacy => block}/hd.c | 0
drivers/ide/Kconfig | 23 -----------------------
drivers/ide/Makefile | 5 -----
5 files changed, 25 insertions(+), 28 deletions(-)
77baf789458a5f43671e832aecd9d237674460a4 diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig
index 0d1d213..c9ab7ef 100644
--- a/drivers/block/Kconfig
+++ b/drivers/block/Kconfig
@@ -433,4 +433,28 @@ config VIRTIO_BLK
This is the virtual block driver for virtio. It can be used with
lguest or QEMU based VMMs (like KVM or Xen). Say Y or M.
+config BLK_DEV_HD
+ bool "Old hard disk (MFM/RLL/IDE) driver"
+ depends on HAVE_IDE
+ depends on !ARM || ARCH_RPC || ARCH_SHARK || BROKEN
+ help
+ There are two drivers for MFM/RLL/IDE hard disks. Most people use
+ the newer enhanced driver, but this old one is still around for two
+ reasons. Some older systems have strange timing problems and seem to
+ work only with the old driver (which itself does not work with some
+ newer systems). The other reason is that the old driver is smaller,
+ since it lacks the enhanced functionality of the new one. This makes
+ it a good choice for systems with very tight memory restrictions, or
+ for systems with only older MFM/RLL/ESDI drives. Choosing the old
+ driver can save 13 KB or so of kernel memory.
+
+ If you want to use this driver together with the new one you have
+ to use "hda=noprobe hdb=noprobe" kernel parameters to prevent the new
+ driver from probing the primary interface.
+
+ If you are unsure, then just choose the Enhanced IDE/MFM/RLL driver
+ instead of this one. For more detailed information, read the
+ Disk-HOWTO, available from
+ <http://www.tldp.org/docs.html#howto>.
+
endif # BLK_DEV
diff --git a/drivers/block/Makefile b/drivers/block/Makefile
index 5e58430..204332b 100644
--- a/drivers/block/Makefile
+++ b/drivers/block/Makefile
@@ -29,5 +29,6 @@ obj-$(CONFIG_VIRTIO_BLK) += virtio_blk.o
obj-$(CONFIG_VIODASD) += viodasd.o
obj-$(CONFIG_BLK_DEV_SX8) += sx8.o
obj-$(CONFIG_BLK_DEV_UB) += ub.o
+obj-$(CONFIG_BLK_DEV_HD) += hd.o
obj-$(CONFIG_XEN_BLKDEV_FRONTEND) += xen-blkfront.o
diff --git a/drivers/block/hd.c b/drivers/block/hd.c
new file mode 100644
index 0000000..00b6956
--- /dev/null
+++ b/drivers/block/hd.c
@@ -0,0 +1,815 @@
+/*
+ * 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 = ARRAY_SIZE(hd_info);
+#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;
+ int stat;
+
+ for (retries = 0; retries < 100000; retries++) {
+ stat = inb_p(HD_STATUS);
+ if (stat & 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_data_dir(req) == READ ? "read" : "writ",
+ cyl, head, sec, nsect, req->buffer);
+#endif
+ if (blk_fs_request(req)) {
+ 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(struct request_queue *q)
+{
+ disable_irq(HD_IRQ);
+ hd_request();
+ enable_irq(HD_IRQ);
+}
+
+static int hd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
+{
+ struct hd_i_struct *disk = bdev->bd_disk->private_data;
+
+ geo->heads = disk->head;
+ geo->sectors = disk->sect;
+ geo->cylinders = disk->cyl;
+ return 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)
+{
+ 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 = {
+ .getgeo = hd_getgeo,
+};
+
+/*
+ * This is the hard disk IRQ description. The IRQF_DISABLED 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);
+
+ if (!NR_HD) {
+ /*
+ * We don't know anything about the drive. This means
+ * that you *MUST* specify the drive parameters to the
+ * kernel yourself.
+ *
+ * If we were on an i386, we used to read this info from
+ * the BIOS or CMOS. This doesn't work all that well,
+ * since this assumes that this is a primary or secondary
+ * drive, and if we're using this legacy driver, it's
+ * probably an auxilliary controller added to recover
+ * legacy data off an ST-506 drive. Either way, it's
+ * definitely safest to have the user explicitly specify
+ * the information.
+ */
+ printk("hd: no drives specified - use hd=cyl,head,sectors"
+ " on kernel command line\n");
+ 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, IRQF_DISABLED, "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);
+
+late_initcall(hd_init);
diff --git a/drivers/ide/Kconfig b/drivers/ide/Kconfig
index 1933345..79cef13 100644
--- a/drivers/ide/Kconfig
+++ b/drivers/ide/Kconfig
@@ -1019,27 +1019,4 @@ config BLK_DEV_IDEDMA
endif
-config BLK_DEV_HD
- bool "Old hard disk (MFM/RLL/IDE) driver"
- depends on !ARM || ARCH_RPC || ARCH_SHARK || BROKEN
- help
- There are two drivers for MFM/RLL/IDE hard disks. Most people use
- the newer enhanced driver, but this old one is still around for two
- reasons. Some older systems have strange timing problems and seem to
- work only with the old driver (which itself does not work with some
- newer systems). The other reason is that the old driver is smaller,
- since it lacks the enhanced functionality of the new one. This makes
- it a good choice for systems with very tight memory restrictions, or
- for systems with only older MFM/RLL/ESDI drives. Choosing the old
- driver can save 13 KB or so of kernel memory.
-
- If you want to use this driver together with the new one you have
- to use "hda=noprobe hdb=noprobe" kernel parameters to prevent the new
- driver from probing the primary interface.
-
- If you are unsure, then just choose the Enhanced IDE/MFM/RLL driver
- instead of this one. For more detailed information, read the
- Disk-HOWTO, available from
- <http://www.tldp.org/docs.html#howto>.
-
endif # IDE
diff --git a/drivers/ide/Makefile b/drivers/ide/Makefile
index 4c95e0f..460f5dc 100644
--- a/drivers/ide/Makefile
+++ b/drivers/ide/Makefile
@@ -56,10 +56,5 @@ ifeq ($(CONFIG_BLK_DEV_PLATFORM), y)
ide-platform-core-y += legacy/ide_platform.o
obj-y += ide-platform-core.o
endif
obj-$(CONFIG_BLK_DEV_IDE) += arm/ mips/
-
-ifeq ($(CONFIG_BLK_DEV_HD), y)
- hd-core-y += legacy/hd.o
- obj-y += hd-core.o
-endif
diff --git a/drivers/ide/legacy/hd.c b/drivers/ide/legacy/hd.c
deleted file mode 100644
index 00b6956..0000000
--- a/drivers/ide/legacy/hd.c
+++ /dev/null
@@ -1,815 +0,0 @@
-/*
- * 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 = ARRAY_SIZE(hd_info);
-#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;
- int stat;
-
- for (retries = 0; retries < 100000; retries++) {
- stat = inb_p(HD_STATUS);
- if (stat & 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_data_dir(req) == READ ? "read" : "writ",
- cyl, head, sec, nsect, req->buffer);
-#endif
- if (blk_fs_request(req)) {
- 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(struct request_queue *q)
-{
- disable_irq(HD_IRQ);
- hd_request();
- enable_irq(HD_IRQ);
-}
-
-static int hd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
-{
- struct hd_i_struct *disk = bdev->bd_disk->private_data;
-
- geo->heads = disk->head;
- geo->sectors = disk->sect;
- geo->cylinders = disk->cyl;
- return 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)
-{
- 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 = {
- .getgeo = hd_getgeo,
-};
-
-/*
- * This is the hard disk IRQ description. The IRQF_DISABLED 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);
-
- if (!NR_HD) {
- /*
- * We don't know anything about the drive. This means
- * that you *MUST* specify the drive parameters to the
- * kernel yourself.
- *
- * If we were on an i386, we used to read this info from
- * the BIOS or CMOS. This doesn't work all that well,
- * since this assumes that this is a primary or secondary
- * drive, and if we're using this legacy driver, it's
- * probably an auxilliary controller added to recover
- * legacy data off an ST-506 drive. Either way, it's
- * definitely safest to have the user explicitly specify
- * the information.
- */
- printk("hd: no drives specified - use hd=cyl,head,sectors"
- " on kernel command line\n");
- 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, IRQF_DISABLED, "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);
-
-late_initcall(hd_init);
^ permalink raw reply related [flat|nested] 11+ messages in thread