mirror of
https://github.com/torvalds/linux.git
synced 2024-12-17 08:31:39 +00:00
86e8486245
Use schedule_timeout_{un,}interruptible() instead of set_current_state()/schedule_timeout() to reduce kernel size. Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com> Cc: Jens Axboe <axboe@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
579 lines
14 KiB
C
579 lines
14 KiB
C
/*
|
|
* Driver for the SWIM (Super Woz Integrated Machine) IOP
|
|
* floppy controller on the Macintosh IIfx and Quadra 900/950
|
|
*
|
|
* Written by Joshua M. Thompson (funaho@jurai.org)
|
|
* based on the SWIM3 driver (c) 1996 by Paul Mackerras.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*
|
|
* 1999-06-12 (jmt) - Initial implementation.
|
|
*/
|
|
|
|
/*
|
|
* -------------------
|
|
* Theory of Operation
|
|
* -------------------
|
|
*
|
|
* Since the SWIM IOP is message-driven we implement a simple request queue
|
|
* system. One outstanding request may be queued at any given time (this is
|
|
* an IOP limitation); only when that request has completed can a new request
|
|
* be sent.
|
|
*/
|
|
|
|
#include <linux/stddef.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/timer.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/fd.h>
|
|
#include <linux/ioctl.h>
|
|
#include <linux/blkdev.h>
|
|
#include <asm/io.h>
|
|
#include <asm/uaccess.h>
|
|
#include <asm/mac_iop.h>
|
|
#include <asm/swim_iop.h>
|
|
|
|
#define DRIVER_VERSION "Version 0.1 (1999-06-12)"
|
|
|
|
#define MAX_FLOPPIES 4
|
|
|
|
enum swim_state {
|
|
idle,
|
|
available,
|
|
revalidating,
|
|
transferring,
|
|
ejecting
|
|
};
|
|
|
|
struct floppy_state {
|
|
enum swim_state state;
|
|
int drive_num; /* device number */
|
|
int secpercyl; /* disk geometry information */
|
|
int secpertrack;
|
|
int total_secs;
|
|
int write_prot; /* 1 if write-protected, 0 if not, -1 dunno */
|
|
int ref_count;
|
|
struct timer_list timeout;
|
|
int ejected;
|
|
struct wait_queue *wait;
|
|
int wanted;
|
|
int timeout_pending;
|
|
};
|
|
|
|
struct swim_iop_req {
|
|
int sent;
|
|
int complete;
|
|
__u8 command[32];
|
|
struct floppy_state *fs;
|
|
void (*done)(struct swim_iop_req *);
|
|
};
|
|
|
|
static struct swim_iop_req *current_req;
|
|
static int floppy_count;
|
|
|
|
static struct floppy_state floppy_states[MAX_FLOPPIES];
|
|
static DEFINE_SPINLOCK(swim_iop_lock);
|
|
|
|
#define CURRENT elv_next_request(swim_queue)
|
|
|
|
static char *drive_names[7] = {
|
|
"not installed", /* DRV_NONE */
|
|
"unknown (1)", /* DRV_UNKNOWN */
|
|
"a 400K drive", /* DRV_400K */
|
|
"an 800K drive" /* DRV_800K */
|
|
"unknown (4)", /* ???? */
|
|
"an FDHD", /* DRV_FDHD */
|
|
"unknown (6)", /* ???? */
|
|
"an Apple HD20" /* DRV_HD20 */
|
|
};
|
|
|
|
int swimiop_init(void);
|
|
static void swimiop_init_request(struct swim_iop_req *);
|
|
static int swimiop_send_request(struct swim_iop_req *);
|
|
static void swimiop_receive(struct iop_msg *, struct pt_regs *);
|
|
static void swimiop_status_update(int, struct swim_drvstatus *);
|
|
static int swimiop_eject(struct floppy_state *fs);
|
|
|
|
static int floppy_ioctl(struct inode *inode, struct file *filp,
|
|
unsigned int cmd, unsigned long param);
|
|
static int floppy_open(struct inode *inode, struct file *filp);
|
|
static int floppy_release(struct inode *inode, struct file *filp);
|
|
static int floppy_check_change(struct gendisk *disk);
|
|
static int floppy_revalidate(struct gendisk *disk);
|
|
static int grab_drive(struct floppy_state *fs, enum swim_state state,
|
|
int interruptible);
|
|
static void release_drive(struct floppy_state *fs);
|
|
static void set_timeout(struct floppy_state *fs, int nticks,
|
|
void (*proc)(unsigned long));
|
|
static void fd_request_timeout(unsigned long);
|
|
static void do_fd_request(request_queue_t * q);
|
|
static void start_request(struct floppy_state *fs);
|
|
|
|
static struct block_device_operations floppy_fops = {
|
|
.open = floppy_open,
|
|
.release = floppy_release,
|
|
.ioctl = floppy_ioctl,
|
|
.media_changed = floppy_check_change,
|
|
.revalidate_disk= floppy_revalidate,
|
|
};
|
|
|
|
static struct request_queue *swim_queue;
|
|
/*
|
|
* SWIM IOP initialization
|
|
*/
|
|
|
|
int swimiop_init(void)
|
|
{
|
|
volatile struct swim_iop_req req;
|
|
struct swimcmd_status *cmd = (struct swimcmd_status *) &req.command[0];
|
|
struct swim_drvstatus *ds = &cmd->status;
|
|
struct floppy_state *fs;
|
|
int i;
|
|
|
|
current_req = NULL;
|
|
floppy_count = 0;
|
|
|
|
if (!iop_ism_present)
|
|
return -ENODEV;
|
|
|
|
if (register_blkdev(FLOPPY_MAJOR, "fd"))
|
|
return -EBUSY;
|
|
|
|
swim_queue = blk_init_queue(do_fd_request, &swim_iop_lock);
|
|
if (!swim_queue) {
|
|
unregister_blkdev(FLOPPY_MAJOR, "fd");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
printk("SWIM-IOP: %s by Joshua M. Thompson (funaho@jurai.org)\n",
|
|
DRIVER_VERSION);
|
|
|
|
if (iop_listen(SWIM_IOP, SWIM_CHAN, swimiop_receive, "SWIM") != 0) {
|
|
printk(KERN_ERR "SWIM-IOP: IOP channel already in use; can't initialize.\n");
|
|
unregister_blkdev(FLOPPY_MAJOR, "fd");
|
|
blk_cleanup_queue(swim_queue);
|
|
return -EBUSY;
|
|
}
|
|
|
|
printk(KERN_ERR "SWIM_IOP: probing for installed drives.\n");
|
|
|
|
for (i = 0 ; i < MAX_FLOPPIES ; i++) {
|
|
memset(&floppy_states[i], 0, sizeof(struct floppy_state));
|
|
fs = &floppy_states[floppy_count];
|
|
|
|
swimiop_init_request(&req);
|
|
cmd->code = CMD_STATUS;
|
|
cmd->drive_num = i + 1;
|
|
if (swimiop_send_request(&req) != 0) continue;
|
|
while (!req.complete);
|
|
if (cmd->error != 0) {
|
|
printk(KERN_ERR "SWIM-IOP: probe on drive %d returned error %d\n", i, (uint) cmd->error);
|
|
continue;
|
|
}
|
|
if (ds->installed != 0x01) continue;
|
|
printk("SWIM-IOP: drive %d is %s (%s, %s, %s, %s)\n", i,
|
|
drive_names[ds->info.type],
|
|
ds->info.external? "ext" : "int",
|
|
ds->info.scsi? "scsi" : "floppy",
|
|
ds->info.fixed? "fixed" : "removable",
|
|
ds->info.secondary? "secondary" : "primary");
|
|
swimiop_status_update(floppy_count, ds);
|
|
fs->state = idle;
|
|
|
|
init_timer(&fs->timeout);
|
|
floppy_count++;
|
|
}
|
|
printk("SWIM-IOP: detected %d installed drives.\n", floppy_count);
|
|
|
|
for (i = 0; i < floppy_count; i++) {
|
|
struct gendisk *disk = alloc_disk(1);
|
|
if (!disk)
|
|
continue;
|
|
disk->major = FLOPPY_MAJOR;
|
|
disk->first_minor = i;
|
|
disk->fops = &floppy_fops;
|
|
sprintf(disk->disk_name, "fd%d", i);
|
|
disk->private_data = &floppy_states[i];
|
|
disk->queue = swim_queue;
|
|
set_capacity(disk, 2880 * 2);
|
|
add_disk(disk);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void swimiop_init_request(struct swim_iop_req *req)
|
|
{
|
|
req->sent = 0;
|
|
req->complete = 0;
|
|
req->done = NULL;
|
|
}
|
|
|
|
static int swimiop_send_request(struct swim_iop_req *req)
|
|
{
|
|
unsigned long flags;
|
|
int err;
|
|
|
|
/* It's doubtful an interrupt routine would try to send */
|
|
/* a SWIM request, but I'd rather play it safe here. */
|
|
|
|
local_irq_save(flags);
|
|
|
|
if (current_req != NULL) {
|
|
local_irq_restore(flags);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
current_req = req;
|
|
|
|
/* Interrupts should be back on for iop_send_message() */
|
|
|
|
local_irq_restore(flags);
|
|
|
|
err = iop_send_message(SWIM_IOP, SWIM_CHAN, (void *) req,
|
|
sizeof(req->command), (__u8 *) &req->command[0],
|
|
swimiop_receive);
|
|
|
|
/* No race condition here; we own current_req at this point */
|
|
|
|
if (err) {
|
|
current_req = NULL;
|
|
} else {
|
|
req->sent = 1;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Receive a SWIM message from the IOP.
|
|
*
|
|
* This will be called in two cases:
|
|
*
|
|
* 1. A message has been successfully sent to the IOP.
|
|
* 2. An unsolicited message was received from the IOP.
|
|
*/
|
|
|
|
void swimiop_receive(struct iop_msg *msg, struct pt_regs *regs)
|
|
{
|
|
struct swim_iop_req *req;
|
|
struct swimmsg_status *sm;
|
|
struct swim_drvstatus *ds;
|
|
|
|
req = current_req;
|
|
|
|
switch(msg->status) {
|
|
case IOP_MSGSTATUS_COMPLETE:
|
|
memcpy(&req->command[0], &msg->reply[0], sizeof(req->command));
|
|
req->complete = 1;
|
|
if (req->done) (*req->done)(req);
|
|
current_req = NULL;
|
|
break;
|
|
case IOP_MSGSTATUS_UNSOL:
|
|
sm = (struct swimmsg_status *) &msg->message[0];
|
|
ds = &sm->status;
|
|
swimiop_status_update(sm->drive_num, ds);
|
|
iop_complete_message(msg);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void swimiop_status_update(int drive_num, struct swim_drvstatus *ds)
|
|
{
|
|
struct floppy_state *fs = &floppy_states[drive_num];
|
|
|
|
fs->write_prot = (ds->write_prot == 0x80);
|
|
if ((ds->disk_in_drive != 0x01) && (ds->disk_in_drive != 0x02)) {
|
|
fs->ejected = 1;
|
|
} else {
|
|
fs->ejected = 0;
|
|
}
|
|
switch(ds->info.type) {
|
|
case DRV_400K:
|
|
fs->secpercyl = 10;
|
|
fs->secpertrack = 10;
|
|
fs->total_secs = 800;
|
|
break;
|
|
case DRV_800K:
|
|
fs->secpercyl = 20;
|
|
fs->secpertrack = 10;
|
|
fs->total_secs = 1600;
|
|
break;
|
|
case DRV_FDHD:
|
|
fs->secpercyl = 36;
|
|
fs->secpertrack = 18;
|
|
fs->total_secs = 2880;
|
|
break;
|
|
default:
|
|
fs->secpercyl = 0;
|
|
fs->secpertrack = 0;
|
|
fs->total_secs = 0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
static int swimiop_eject(struct floppy_state *fs)
|
|
{
|
|
int err, n;
|
|
struct swim_iop_req req;
|
|
struct swimcmd_eject *cmd = (struct swimcmd_eject *) &req.command[0];
|
|
|
|
err = grab_drive(fs, ejecting, 1);
|
|
if (err) return err;
|
|
|
|
swimiop_init_request(&req);
|
|
cmd->code = CMD_EJECT;
|
|
cmd->drive_num = fs->drive_num;
|
|
err = swimiop_send_request(&req);
|
|
if (err) {
|
|
release_drive(fs);
|
|
return err;
|
|
}
|
|
for (n = 2*HZ; n > 0; --n) {
|
|
if (req.complete) break;
|
|
if (signal_pending(current)) {
|
|
err = -EINTR;
|
|
break;
|
|
}
|
|
schedule_timeout_interruptible(1);
|
|
}
|
|
release_drive(fs);
|
|
return cmd->error;
|
|
}
|
|
|
|
static struct floppy_struct floppy_type =
|
|
{ 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,NULL }; /* 7 1.44MB 3.5" */
|
|
|
|
static int floppy_ioctl(struct inode *inode, struct file *filp,
|
|
unsigned int cmd, unsigned long param)
|
|
{
|
|
struct floppy_state *fs = inode->i_bdev->bd_disk->private_data;
|
|
int err;
|
|
|
|
if ((cmd & 0x80) && !capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
|
|
switch (cmd) {
|
|
case FDEJECT:
|
|
if (fs->ref_count != 1)
|
|
return -EBUSY;
|
|
err = swimiop_eject(fs);
|
|
return err;
|
|
case FDGETPRM:
|
|
if (copy_to_user((void *) param, (void *) &floppy_type,
|
|
sizeof(struct floppy_struct)))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
return -ENOTTY;
|
|
}
|
|
|
|
static int floppy_open(struct inode *inode, struct file *filp)
|
|
{
|
|
struct floppy_state *fs = inode->i_bdev->bd_disk->private_data;
|
|
|
|
if (fs->ref_count == -1 || filp->f_flags & O_EXCL)
|
|
return -EBUSY;
|
|
|
|
if ((filp->f_flags & O_NDELAY) == 0 && (filp->f_mode & 3)) {
|
|
check_disk_change(inode->i_bdev);
|
|
if (fs->ejected)
|
|
return -ENXIO;
|
|
}
|
|
|
|
if ((filp->f_mode & 2) && fs->write_prot)
|
|
return -EROFS;
|
|
|
|
if (filp->f_flags & O_EXCL)
|
|
fs->ref_count = -1;
|
|
else
|
|
++fs->ref_count;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int floppy_release(struct inode *inode, struct file *filp)
|
|
{
|
|
struct floppy_state *fs = inode->i_bdev->bd_disk->private_data;
|
|
if (fs->ref_count > 0)
|
|
fs->ref_count--;
|
|
return 0;
|
|
}
|
|
|
|
static int floppy_check_change(struct gendisk *disk)
|
|
{
|
|
struct floppy_state *fs = disk->private_data;
|
|
return fs->ejected;
|
|
}
|
|
|
|
static int floppy_revalidate(struct gendisk *disk)
|
|
{
|
|
struct floppy_state *fs = disk->private_data;
|
|
grab_drive(fs, revalidating, 0);
|
|
/* yadda, yadda */
|
|
release_drive(fs);
|
|
return 0;
|
|
}
|
|
|
|
static void floppy_off(unsigned int nr)
|
|
{
|
|
}
|
|
|
|
static int grab_drive(struct floppy_state *fs, enum swim_state state,
|
|
int interruptible)
|
|
{
|
|
unsigned long flags;
|
|
|
|
local_irq_save(flags);
|
|
if (fs->state != idle) {
|
|
++fs->wanted;
|
|
while (fs->state != available) {
|
|
if (interruptible && signal_pending(current)) {
|
|
--fs->wanted;
|
|
local_irq_restore(flags);
|
|
return -EINTR;
|
|
}
|
|
interruptible_sleep_on(&fs->wait);
|
|
}
|
|
--fs->wanted;
|
|
}
|
|
fs->state = state;
|
|
local_irq_restore(flags);
|
|
return 0;
|
|
}
|
|
|
|
static void release_drive(struct floppy_state *fs)
|
|
{
|
|
unsigned long flags;
|
|
|
|
local_irq_save(flags);
|
|
fs->state = idle;
|
|
start_request(fs);
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
static void set_timeout(struct floppy_state *fs, int nticks,
|
|
void (*proc)(unsigned long))
|
|
{
|
|
unsigned long flags;
|
|
|
|
local_irq_save(flags);
|
|
if (fs->timeout_pending)
|
|
del_timer(&fs->timeout);
|
|
init_timer(&fs->timeout);
|
|
fs->timeout.expires = jiffies + nticks;
|
|
fs->timeout.function = proc;
|
|
fs->timeout.data = (unsigned long) fs;
|
|
add_timer(&fs->timeout);
|
|
fs->timeout_pending = 1;
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
static void do_fd_request(request_queue_t * q)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0 ; i < floppy_count ; i++) {
|
|
start_request(&floppy_states[i]);
|
|
}
|
|
}
|
|
|
|
static void fd_request_complete(struct swim_iop_req *req)
|
|
{
|
|
struct floppy_state *fs = req->fs;
|
|
struct swimcmd_rw *cmd = (struct swimcmd_rw *) &req->command[0];
|
|
|
|
del_timer(&fs->timeout);
|
|
fs->timeout_pending = 0;
|
|
fs->state = idle;
|
|
if (cmd->error) {
|
|
printk(KERN_ERR "SWIM-IOP: error %d on read/write request.\n", cmd->error);
|
|
end_request(CURRENT, 0);
|
|
} else {
|
|
CURRENT->sector += cmd->num_blocks;
|
|
CURRENT->current_nr_sectors -= cmd->num_blocks;
|
|
if (CURRENT->current_nr_sectors <= 0) {
|
|
end_request(CURRENT, 1);
|
|
return;
|
|
}
|
|
}
|
|
start_request(fs);
|
|
}
|
|
|
|
static void fd_request_timeout(unsigned long data)
|
|
{
|
|
struct floppy_state *fs = (struct floppy_state *) data;
|
|
|
|
fs->timeout_pending = 0;
|
|
end_request(CURRENT, 0);
|
|
fs->state = idle;
|
|
}
|
|
|
|
static void start_request(struct floppy_state *fs)
|
|
{
|
|
volatile struct swim_iop_req req;
|
|
struct swimcmd_rw *cmd = (struct swimcmd_rw *) &req.command[0];
|
|
|
|
if (fs->state == idle && fs->wanted) {
|
|
fs->state = available;
|
|
wake_up(&fs->wait);
|
|
return;
|
|
}
|
|
while (CURRENT && fs->state == idle) {
|
|
if (CURRENT->bh && !buffer_locked(CURRENT->bh))
|
|
panic("floppy: block not locked");
|
|
#if 0
|
|
printk("do_fd_req: dev=%s cmd=%d sec=%ld nr_sec=%ld buf=%p\n",
|
|
CURRENT->rq_disk->disk_name, CURRENT->cmd,
|
|
CURRENT->sector, CURRENT->nr_sectors, CURRENT->buffer);
|
|
printk(" rq_status=%d errors=%d current_nr_sectors=%ld\n",
|
|
CURRENT->rq_status, CURRENT->errors, CURRENT->current_nr_sectors);
|
|
#endif
|
|
|
|
if (CURRENT->sector < 0 || CURRENT->sector >= fs->total_secs) {
|
|
end_request(CURRENT, 0);
|
|
continue;
|
|
}
|
|
if (CURRENT->current_nr_sectors == 0) {
|
|
end_request(CURRENT, 1);
|
|
continue;
|
|
}
|
|
if (fs->ejected) {
|
|
end_request(CURRENT, 0);
|
|
continue;
|
|
}
|
|
|
|
swimiop_init_request(&req);
|
|
req.fs = fs;
|
|
req.done = fd_request_complete;
|
|
|
|
if (CURRENT->cmd == WRITE) {
|
|
if (fs->write_prot) {
|
|
end_request(CURRENT, 0);
|
|
continue;
|
|
}
|
|
cmd->code = CMD_WRITE;
|
|
} else {
|
|
cmd->code = CMD_READ;
|
|
|
|
}
|
|
cmd->drive_num = fs->drive_num;
|
|
cmd->buffer = CURRENT->buffer;
|
|
cmd->first_block = CURRENT->sector;
|
|
cmd->num_blocks = CURRENT->current_nr_sectors;
|
|
|
|
if (swimiop_send_request(&req)) {
|
|
end_request(CURRENT, 0);
|
|
continue;
|
|
}
|
|
|
|
set_timeout(fs, HZ*CURRENT->current_nr_sectors,
|
|
fd_request_timeout);
|
|
|
|
fs->state = transferring;
|
|
}
|
|
}
|