Viewing file:  swim_iop.c (13.91 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/*
* 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.
*/
/* This has to be defined before some of the #includes below */
#define MAJOR_NR FLOPPY_MAJOR
#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/blk.h>
#include <linux/ioctl.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 int floppy_blocksizes[2] = {512,512};
static int floppy_sizes[2] = {2880,2880};
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(kdev_t dev);
static int floppy_revalidate(kdev_t dev);
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,
check_media_change: floppy_check_change,
revalidate: floppy_revalidate,
};
/*
* 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(MAJOR_NR, "fd", &floppy_fops)) {
printk(KERN_ERR "SWIM-IOP: Unable to get major %d for floppy\n",
MAJOR_NR);
return -EBUSY;
}
blk_init_queue(BLK_DEFAULT_QUEUE(MAJOR_NR), DEVICE_REQUEST);
blksize_size[MAJOR_NR] = floppy_blocksizes;
blk_size[MAJOR_NR] = floppy_sizes;
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");
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);
do_floppy = NULL;
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 cpu_flags;
int err;
/* It's doubtful an interrupt routine would try to send */
/* a SWIM request, but I'd rather play it safe here. */
save_flags(cpu_flags);
cli();
if (current_req != NULL) {
restore_flags(cpu_flags);
return -ENOMEM;
}
current_req = req;
/* Interrupts should be back on for iop_send_message() */
restore_flags(cpu_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;
}
current->state = TASK_INTERRUPTIBLE;
schedule_timeout(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;
int err;
int devnum = MINOR(inode->i_rdev);
if (devnum >= floppy_count)
return -ENODEV;
if ((cmd & 0x80) && !suser())
return -EPERM;
fs = &floppy_states[devnum];
switch (cmd) {
case FDEJECT:
if (fs->ref_count != 1)
return -EBUSY;
err = swimiop_eject(fs);
return err;
case FDGETPRM:
err = copy_to_user((void *) param, (void *) &floppy_type,
sizeof(struct floppy_struct));
return err;
}
return -ENOTTY;
}
static int floppy_open(struct inode *inode, struct file *filp)
{
struct floppy_state *fs;
int err;
int devnum = MINOR(inode->i_rdev);
if (devnum >= floppy_count)
return -ENODEV;
if (filp == 0)
return -EIO;
fs = &floppy_states[devnum];
err = 0;
if (fs->ref_count == -1 || filp->f_flags & O_EXCL) return -EBUSY;
if (err == 0 && (filp->f_flags & O_NDELAY) == 0
&& (filp->f_mode & 3)) {
check_disk_change(inode->i_rdev);
if (fs->ejected)
err = -ENXIO;
}
if (err == 0 && (filp->f_mode & 2)) {
if (fs->write_prot)
err = -EROFS;
}
if (err) return err;
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;
int devnum = MINOR(inode->i_rdev);
if (devnum >= floppy_count)
return -ENODEV;
fs = &floppy_states[devnum];
if (fs->ref_count > 0) fs->ref_count--;
return 0;
}
static int floppy_check_change(kdev_t dev)
{
struct floppy_state *fs;
int devnum = MINOR(dev);
if (MAJOR(dev) != MAJOR_NR || (devnum >= floppy_count))
return 0;
fs = &floppy_states[devnum];
return fs->ejected;
}
static int floppy_revalidate(kdev_t dev)
{
struct floppy_state *fs;
int devnum = MINOR(dev);
if (MAJOR(dev) != MAJOR_NR || (devnum >= floppy_count))
return 0;
fs = &floppy_states[devnum];
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;
save_flags(flags);
cli();
if (fs->state != idle) {
++fs->wanted;
while (fs->state != available) {
if (interruptible && signal_pending(current)) {
--fs->wanted;
restore_flags(flags);
return -EINTR;
}
interruptible_sleep_on(&fs->wait);
}
--fs->wanted;
}
fs->state = state;
restore_flags(flags);
return 0;
}
static void release_drive(struct floppy_state *fs)
{
unsigned long flags;
save_flags(flags);
cli();
fs->state = idle;
start_request(fs);
restore_flags(flags);
}
static void set_timeout(struct floppy_state *fs, int nticks,
void (*proc)(unsigned long))
{
unsigned long flags;
save_flags(flags); cli();
if (fs->timeout_pending)
del_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;
restore_flags(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(0);
} else {
CURRENT->sector += cmd->num_blocks;
CURRENT->current_nr_sectors -= cmd->num_blocks;
if (CURRENT->current_nr_sectors <= 0) {
end_request(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(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 (!QUEUE_EMPTY && fs->state == idle) {
if (MAJOR(CURRENT->rq_dev) != MAJOR_NR)
panic(DEVICE_NAME ": request list destroyed");
if (CURRENT->bh && !buffer_locked(CURRENT->bh))
panic(DEVICE_NAME ": block not locked");
#if 0
printk("do_fd_req: dev=%x cmd=%d sec=%ld nr_sec=%ld buf=%p\n",
kdev_t_to_nr(CURRENT->rq_dev), 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(0);
continue;
}
if (CURRENT->current_nr_sectors == 0) {
end_request(1);
continue;
}
if (fs->ejected) {
end_request(0);
continue;
}
swimiop_init_request(&req);
req.fs = fs;
req.done = fd_request_complete;
if (CURRENT->cmd == WRITE) {
if (fs->write_prot) {
end_request(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(0);
continue;
}
set_timeout(fs, HZ*CURRENT->current_nr_sectors,
fd_request_timeout);
fs->state = transferring;
}
}
|