1035 lines
25 KiB
C
Executable file
1035 lines
25 KiB
C
Executable file
/*
|
|
pf.c (c) 1997-8 Grant R. Guenther <grant@torque.net>
|
|
Under the terms of the GNU General Public License.
|
|
|
|
This is the high-level driver for parallel port ATAPI disk
|
|
drives based on chips supported by the paride module.
|
|
|
|
By default, the driver will autoprobe for a single parallel
|
|
port ATAPI disk drive, but if their individual parameters are
|
|
specified, the driver can handle up to 4 drives.
|
|
|
|
The behaviour of the pf driver can be altered by setting
|
|
some parameters from the insmod command line. The following
|
|
parameters are adjustable:
|
|
|
|
drive0 These four arguments can be arrays of
|
|
drive1 1-7 integers as follows:
|
|
drive2
|
|
drive3 <prt>,<pro>,<uni>,<mod>,<slv>,<lun>,<dly>
|
|
|
|
Where,
|
|
|
|
<prt> is the base of the parallel port address for
|
|
the corresponding drive. (required)
|
|
|
|
<pro> is the protocol number for the adapter that
|
|
supports this drive. These numbers are
|
|
logged by 'paride' when the protocol modules
|
|
are initialised. (0 if not given)
|
|
|
|
<uni> for those adapters that support chained
|
|
devices, this is the unit selector for the
|
|
chain of devices on the given port. It should
|
|
be zero for devices that don't support chaining.
|
|
(0 if not given)
|
|
|
|
<mod> this can be -1 to choose the best mode, or one
|
|
of the mode numbers supported by the adapter.
|
|
(-1 if not given)
|
|
|
|
<slv> ATAPI CDroms can be jumpered to master or slave.
|
|
Set this to 0 to choose the master drive, 1 to
|
|
choose the slave, -1 (the default) to choose the
|
|
first drive found.
|
|
|
|
<lun> Some ATAPI devices support multiple LUNs.
|
|
One example is the ATAPI PD/CD drive from
|
|
Matshita/Panasonic. This device has a
|
|
CD drive on LUN 0 and a PD drive on LUN 1.
|
|
By default, the driver will search for the
|
|
first LUN with a supported device. Set
|
|
this parameter to force it to use a specific
|
|
LUN. (default -1)
|
|
|
|
<dly> some parallel ports require the driver to
|
|
go more slowly. -1 sets a default value that
|
|
should work with the chosen protocol. Otherwise,
|
|
set this to a small integer, the larger it is
|
|
the slower the port i/o. In some cases, setting
|
|
this to zero will speed up the device. (default -1)
|
|
|
|
major You may use this parameter to override the
|
|
default major number (47) that this driver
|
|
will use. Be sure to change the device
|
|
name as well.
|
|
|
|
name This parameter is a character string that
|
|
contains the name the kernel will use for this
|
|
device (in /proc output, for instance).
|
|
(default "pf").
|
|
|
|
cluster The driver will attempt to aggregate requests
|
|
for adjacent blocks into larger multi-block
|
|
clusters. The maximum cluster size (in 512
|
|
byte sectors) is set with this parameter.
|
|
(default 64)
|
|
|
|
verbose This parameter controls the amount of logging
|
|
that the driver will do. Set it to 0 for
|
|
normal operation, 1 to see autoprobe progress
|
|
messages, or 2 to see additional debugging
|
|
output. (default 0)
|
|
|
|
nice This parameter controls the driver's use of
|
|
idle CPU time, at the expense of some speed.
|
|
|
|
If this driver is built into the kernel, you can use the
|
|
following command line parameters, with the same values
|
|
as the corresponding module parameters listed above:
|
|
|
|
pf.drive0
|
|
pf.drive1
|
|
pf.drive2
|
|
pf.drive3
|
|
pf.cluster
|
|
pf.nice
|
|
|
|
In addition, you can use the parameter pf.disable to disable
|
|
the driver entirely.
|
|
|
|
*/
|
|
|
|
/* Changes:
|
|
|
|
1.01 GRG 1998.05.03 Changes for SMP. Eliminate sti().
|
|
Fix for drives that don't clear STAT_ERR
|
|
until after next CDB delivered.
|
|
Small change in pf_completion to round
|
|
up transfer size.
|
|
1.02 GRG 1998.06.16 Eliminated an Ugh
|
|
1.03 GRG 1998.08.16 Use HZ in loop timings, extra debugging
|
|
1.04 GRG 1998.09.24 Added jumbo support
|
|
|
|
*/
|
|
|
|
#define PF_VERSION "1.04"
|
|
#define PF_MAJOR 47
|
|
#define PF_NAME "pf"
|
|
#define PF_UNITS 4
|
|
|
|
#include <linux/types.h>
|
|
|
|
/* Here are things one can override from the insmod command.
|
|
Most are autoprobed by paride unless set here. Verbose is off
|
|
by default.
|
|
|
|
*/
|
|
|
|
static bool verbose = 0;
|
|
static int major = PF_MAJOR;
|
|
static char *name = PF_NAME;
|
|
static int cluster = 64;
|
|
static int nice = 0;
|
|
static int disable = 0;
|
|
|
|
static int drive0[7] = { 0, 0, 0, -1, -1, -1, -1 };
|
|
static int drive1[7] = { 0, 0, 0, -1, -1, -1, -1 };
|
|
static int drive2[7] = { 0, 0, 0, -1, -1, -1, -1 };
|
|
static int drive3[7] = { 0, 0, 0, -1, -1, -1, -1 };
|
|
|
|
static int (*drives[4])[7] = {&drive0, &drive1, &drive2, &drive3};
|
|
static int pf_drive_count;
|
|
|
|
enum {D_PRT, D_PRO, D_UNI, D_MOD, D_SLV, D_LUN, D_DLY};
|
|
|
|
/* end of parameters */
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/hdreg.h>
|
|
#include <linux/cdrom.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/blkdev.h>
|
|
#include <linux/blkpg.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/uaccess.h>
|
|
|
|
static DEFINE_MUTEX(pf_mutex);
|
|
static DEFINE_SPINLOCK(pf_spin_lock);
|
|
|
|
module_param(verbose, bool, 0644);
|
|
module_param(major, int, 0);
|
|
module_param(name, charp, 0);
|
|
module_param(cluster, int, 0);
|
|
module_param(nice, int, 0);
|
|
module_param_array(drive0, int, NULL, 0);
|
|
module_param_array(drive1, int, NULL, 0);
|
|
module_param_array(drive2, int, NULL, 0);
|
|
module_param_array(drive3, int, NULL, 0);
|
|
|
|
#include "paride.h"
|
|
#include "pseudo.h"
|
|
|
|
/* constants for faking geometry numbers */
|
|
|
|
#define PF_FD_MAX 8192 /* use FD geometry under this size */
|
|
#define PF_FD_HDS 2
|
|
#define PF_FD_SPT 18
|
|
#define PF_HD_HDS 64
|
|
#define PF_HD_SPT 32
|
|
|
|
#define PF_MAX_RETRIES 5
|
|
#define PF_TMO 800 /* interrupt timeout in jiffies */
|
|
#define PF_SPIN_DEL 50 /* spin delay in micro-seconds */
|
|
|
|
#define PF_SPIN (1000000*PF_TMO)/(HZ*PF_SPIN_DEL)
|
|
|
|
#define STAT_ERR 0x00001
|
|
#define STAT_INDEX 0x00002
|
|
#define STAT_ECC 0x00004
|
|
#define STAT_DRQ 0x00008
|
|
#define STAT_SEEK 0x00010
|
|
#define STAT_WRERR 0x00020
|
|
#define STAT_READY 0x00040
|
|
#define STAT_BUSY 0x00080
|
|
|
|
#define ATAPI_REQ_SENSE 0x03
|
|
#define ATAPI_LOCK 0x1e
|
|
#define ATAPI_DOOR 0x1b
|
|
#define ATAPI_MODE_SENSE 0x5a
|
|
#define ATAPI_CAPACITY 0x25
|
|
#define ATAPI_IDENTIFY 0x12
|
|
#define ATAPI_READ_10 0x28
|
|
#define ATAPI_WRITE_10 0x2a
|
|
|
|
static int pf_open(struct block_device *bdev, fmode_t mode);
|
|
static void do_pf_request(struct request_queue * q);
|
|
static int pf_ioctl(struct block_device *bdev, fmode_t mode,
|
|
unsigned int cmd, unsigned long arg);
|
|
static int pf_getgeo(struct block_device *bdev, struct hd_geometry *geo);
|
|
|
|
static void pf_release(struct gendisk *disk, fmode_t mode);
|
|
|
|
static int pf_detect(void);
|
|
static void do_pf_read(void);
|
|
static void do_pf_read_start(void);
|
|
static void do_pf_write(void);
|
|
static void do_pf_write_start(void);
|
|
static void do_pf_read_drq(void);
|
|
static void do_pf_write_done(void);
|
|
|
|
#define PF_NM 0
|
|
#define PF_RO 1
|
|
#define PF_RW 2
|
|
|
|
#define PF_NAMELEN 8
|
|
|
|
struct pf_unit {
|
|
struct pi_adapter pia; /* interface to paride layer */
|
|
struct pi_adapter *pi;
|
|
int removable; /* removable media device ? */
|
|
int media_status; /* media present ? WP ? */
|
|
int drive; /* drive */
|
|
int lun;
|
|
int access; /* count of active opens ... */
|
|
int present; /* device present ? */
|
|
char name[PF_NAMELEN]; /* pf0, pf1, ... */
|
|
struct gendisk *disk;
|
|
};
|
|
|
|
static struct pf_unit units[PF_UNITS];
|
|
|
|
static int pf_identify(struct pf_unit *pf);
|
|
static void pf_lock(struct pf_unit *pf, int func);
|
|
static void pf_eject(struct pf_unit *pf);
|
|
static unsigned int pf_check_events(struct gendisk *disk,
|
|
unsigned int clearing);
|
|
|
|
static char pf_scratch[512]; /* scratch block buffer */
|
|
|
|
/* the variables below are used mainly in the I/O request engine, which
|
|
processes only one request at a time.
|
|
*/
|
|
|
|
static int pf_retries = 0; /* i/o error retry count */
|
|
static int pf_busy = 0; /* request being processed ? */
|
|
static struct request *pf_req; /* current request */
|
|
static int pf_block; /* address of next requested block */
|
|
static int pf_count; /* number of blocks still to do */
|
|
static int pf_run; /* sectors in current cluster */
|
|
static int pf_cmd; /* current command READ/WRITE */
|
|
static struct pf_unit *pf_current;/* unit of current request */
|
|
static int pf_mask; /* stopper for pseudo-int */
|
|
static char *pf_buf; /* buffer for request in progress */
|
|
static void *par_drv; /* reference of parport driver */
|
|
|
|
/* kernel glue structures */
|
|
|
|
static const struct block_device_operations pf_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = pf_open,
|
|
.release = pf_release,
|
|
.ioctl = pf_ioctl,
|
|
.getgeo = pf_getgeo,
|
|
.check_events = pf_check_events,
|
|
};
|
|
|
|
static void __init pf_init_units(void)
|
|
{
|
|
struct pf_unit *pf;
|
|
int unit;
|
|
|
|
pf_drive_count = 0;
|
|
for (unit = 0, pf = units; unit < PF_UNITS; unit++, pf++) {
|
|
struct gendisk *disk = alloc_disk(1);
|
|
if (!disk)
|
|
continue;
|
|
disk->queue = blk_init_queue(do_pf_request, &pf_spin_lock);
|
|
if (!disk->queue) {
|
|
put_disk(disk);
|
|
return;
|
|
}
|
|
blk_queue_max_segments(disk->queue, cluster);
|
|
blk_queue_bounce_limit(disk->queue, BLK_BOUNCE_HIGH);
|
|
pf->disk = disk;
|
|
pf->pi = &pf->pia;
|
|
pf->media_status = PF_NM;
|
|
pf->drive = (*drives[unit])[D_SLV];
|
|
pf->lun = (*drives[unit])[D_LUN];
|
|
snprintf(pf->name, PF_NAMELEN, "%s%d", name, unit);
|
|
disk->major = major;
|
|
disk->first_minor = unit;
|
|
strcpy(disk->disk_name, pf->name);
|
|
disk->fops = &pf_fops;
|
|
if (!(*drives[unit])[D_PRT])
|
|
pf_drive_count++;
|
|
}
|
|
}
|
|
|
|
static int pf_open(struct block_device *bdev, fmode_t mode)
|
|
{
|
|
struct pf_unit *pf = bdev->bd_disk->private_data;
|
|
int ret;
|
|
|
|
mutex_lock(&pf_mutex);
|
|
pf_identify(pf);
|
|
|
|
ret = -ENODEV;
|
|
if (pf->media_status == PF_NM)
|
|
goto out;
|
|
|
|
ret = -EROFS;
|
|
if ((pf->media_status == PF_RO) && (mode & FMODE_WRITE))
|
|
goto out;
|
|
|
|
ret = 0;
|
|
pf->access++;
|
|
if (pf->removable)
|
|
pf_lock(pf, 1);
|
|
out:
|
|
mutex_unlock(&pf_mutex);
|
|
return ret;
|
|
}
|
|
|
|
static int pf_getgeo(struct block_device *bdev, struct hd_geometry *geo)
|
|
{
|
|
struct pf_unit *pf = bdev->bd_disk->private_data;
|
|
sector_t capacity = get_capacity(pf->disk);
|
|
|
|
if (capacity < PF_FD_MAX) {
|
|
geo->cylinders = sector_div(capacity, PF_FD_HDS * PF_FD_SPT);
|
|
geo->heads = PF_FD_HDS;
|
|
geo->sectors = PF_FD_SPT;
|
|
} else {
|
|
geo->cylinders = sector_div(capacity, PF_HD_HDS * PF_HD_SPT);
|
|
geo->heads = PF_HD_HDS;
|
|
geo->sectors = PF_HD_SPT;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pf_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct pf_unit *pf = bdev->bd_disk->private_data;
|
|
|
|
if (cmd != CDROMEJECT)
|
|
return -EINVAL;
|
|
|
|
if (pf->access != 1)
|
|
return -EBUSY;
|
|
mutex_lock(&pf_mutex);
|
|
pf_eject(pf);
|
|
mutex_unlock(&pf_mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void pf_release(struct gendisk *disk, fmode_t mode)
|
|
{
|
|
struct pf_unit *pf = disk->private_data;
|
|
|
|
mutex_lock(&pf_mutex);
|
|
if (pf->access <= 0) {
|
|
mutex_unlock(&pf_mutex);
|
|
WARN_ON(1);
|
|
return;
|
|
}
|
|
|
|
pf->access--;
|
|
|
|
if (!pf->access && pf->removable)
|
|
pf_lock(pf, 0);
|
|
|
|
mutex_unlock(&pf_mutex);
|
|
}
|
|
|
|
static unsigned int pf_check_events(struct gendisk *disk, unsigned int clearing)
|
|
{
|
|
return DISK_EVENT_MEDIA_CHANGE;
|
|
}
|
|
|
|
static inline int status_reg(struct pf_unit *pf)
|
|
{
|
|
return pi_read_regr(pf->pi, 1, 6);
|
|
}
|
|
|
|
static inline int read_reg(struct pf_unit *pf, int reg)
|
|
{
|
|
return pi_read_regr(pf->pi, 0, reg);
|
|
}
|
|
|
|
static inline void write_reg(struct pf_unit *pf, int reg, int val)
|
|
{
|
|
pi_write_regr(pf->pi, 0, reg, val);
|
|
}
|
|
|
|
static int pf_wait(struct pf_unit *pf, int go, int stop, char *fun, char *msg)
|
|
{
|
|
int j, r, e, s, p;
|
|
|
|
j = 0;
|
|
while ((((r = status_reg(pf)) & go) || (stop && (!(r & stop))))
|
|
&& (j++ < PF_SPIN))
|
|
udelay(PF_SPIN_DEL);
|
|
|
|
if ((r & (STAT_ERR & stop)) || (j > PF_SPIN)) {
|
|
s = read_reg(pf, 7);
|
|
e = read_reg(pf, 1);
|
|
p = read_reg(pf, 2);
|
|
if (j > PF_SPIN)
|
|
e |= 0x100;
|
|
if (fun)
|
|
printk("%s: %s %s: alt=0x%x stat=0x%x err=0x%x"
|
|
" loop=%d phase=%d\n",
|
|
pf->name, fun, msg, r, s, e, j, p);
|
|
return (e << 8) + s;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int pf_command(struct pf_unit *pf, char *cmd, int dlen, char *fun)
|
|
{
|
|
pi_connect(pf->pi);
|
|
|
|
write_reg(pf, 6, 0xa0+0x10*pf->drive);
|
|
|
|
if (pf_wait(pf, STAT_BUSY | STAT_DRQ, 0, fun, "before command")) {
|
|
pi_disconnect(pf->pi);
|
|
return -1;
|
|
}
|
|
|
|
write_reg(pf, 4, dlen % 256);
|
|
write_reg(pf, 5, dlen / 256);
|
|
write_reg(pf, 7, 0xa0); /* ATAPI packet command */
|
|
|
|
if (pf_wait(pf, STAT_BUSY, STAT_DRQ, fun, "command DRQ")) {
|
|
pi_disconnect(pf->pi);
|
|
return -1;
|
|
}
|
|
|
|
if (read_reg(pf, 2) != 1) {
|
|
printk("%s: %s: command phase error\n", pf->name, fun);
|
|
pi_disconnect(pf->pi);
|
|
return -1;
|
|
}
|
|
|
|
pi_write_block(pf->pi, cmd, 12);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pf_completion(struct pf_unit *pf, char *buf, char *fun)
|
|
{
|
|
int r, s, n;
|
|
|
|
r = pf_wait(pf, STAT_BUSY, STAT_DRQ | STAT_READY | STAT_ERR,
|
|
fun, "completion");
|
|
|
|
if ((read_reg(pf, 2) & 2) && (read_reg(pf, 7) & STAT_DRQ)) {
|
|
n = (((read_reg(pf, 4) + 256 * read_reg(pf, 5)) +
|
|
3) & 0xfffc);
|
|
pi_read_block(pf->pi, buf, n);
|
|
}
|
|
|
|
s = pf_wait(pf, STAT_BUSY, STAT_READY | STAT_ERR, fun, "data done");
|
|
|
|
pi_disconnect(pf->pi);
|
|
|
|
return (r ? r : s);
|
|
}
|
|
|
|
static void pf_req_sense(struct pf_unit *pf, int quiet)
|
|
{
|
|
char rs_cmd[12] =
|
|
{ ATAPI_REQ_SENSE, pf->lun << 5, 0, 0, 16, 0, 0, 0, 0, 0, 0, 0 };
|
|
char buf[16];
|
|
int r;
|
|
|
|
r = pf_command(pf, rs_cmd, 16, "Request sense");
|
|
mdelay(1);
|
|
if (!r)
|
|
pf_completion(pf, buf, "Request sense");
|
|
|
|
if ((!r) && (!quiet))
|
|
printk("%s: Sense key: %x, ASC: %x, ASQ: %x\n",
|
|
pf->name, buf[2] & 0xf, buf[12], buf[13]);
|
|
}
|
|
|
|
static int pf_atapi(struct pf_unit *pf, char *cmd, int dlen, char *buf, char *fun)
|
|
{
|
|
int r;
|
|
|
|
r = pf_command(pf, cmd, dlen, fun);
|
|
mdelay(1);
|
|
if (!r)
|
|
r = pf_completion(pf, buf, fun);
|
|
if (r)
|
|
pf_req_sense(pf, !fun);
|
|
|
|
return r;
|
|
}
|
|
|
|
static void pf_lock(struct pf_unit *pf, int func)
|
|
{
|
|
char lo_cmd[12] = { ATAPI_LOCK, pf->lun << 5, 0, 0, func, 0, 0, 0, 0, 0, 0, 0 };
|
|
|
|
pf_atapi(pf, lo_cmd, 0, pf_scratch, func ? "lock" : "unlock");
|
|
}
|
|
|
|
static void pf_eject(struct pf_unit *pf)
|
|
{
|
|
char ej_cmd[12] = { ATAPI_DOOR, pf->lun << 5, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0 };
|
|
|
|
pf_lock(pf, 0);
|
|
pf_atapi(pf, ej_cmd, 0, pf_scratch, "eject");
|
|
}
|
|
|
|
#define PF_RESET_TMO 30 /* in tenths of a second */
|
|
|
|
static void pf_sleep(int cs)
|
|
{
|
|
schedule_timeout_interruptible(cs);
|
|
}
|
|
|
|
/* the ATAPI standard actually specifies the contents of all 7 registers
|
|
after a reset, but the specification is ambiguous concerning the last
|
|
two bytes, and different drives interpret the standard differently.
|
|
*/
|
|
|
|
static int pf_reset(struct pf_unit *pf)
|
|
{
|
|
int i, k, flg;
|
|
int expect[5] = { 1, 1, 1, 0x14, 0xeb };
|
|
|
|
pi_connect(pf->pi);
|
|
write_reg(pf, 6, 0xa0+0x10*pf->drive);
|
|
write_reg(pf, 7, 8);
|
|
|
|
pf_sleep(20 * HZ / 1000);
|
|
|
|
k = 0;
|
|
while ((k++ < PF_RESET_TMO) && (status_reg(pf) & STAT_BUSY))
|
|
pf_sleep(HZ / 10);
|
|
|
|
flg = 1;
|
|
for (i = 0; i < 5; i++)
|
|
flg &= (read_reg(pf, i + 1) == expect[i]);
|
|
|
|
if (verbose) {
|
|
printk("%s: Reset (%d) signature = ", pf->name, k);
|
|
for (i = 0; i < 5; i++)
|
|
printk("%3x", read_reg(pf, i + 1));
|
|
if (!flg)
|
|
printk(" (incorrect)");
|
|
printk("\n");
|
|
}
|
|
|
|
pi_disconnect(pf->pi);
|
|
return flg - 1;
|
|
}
|
|
|
|
static void pf_mode_sense(struct pf_unit *pf)
|
|
{
|
|
char ms_cmd[12] =
|
|
{ ATAPI_MODE_SENSE, pf->lun << 5, 0, 0, 0, 0, 0, 0, 8, 0, 0, 0 };
|
|
char buf[8];
|
|
|
|
pf_atapi(pf, ms_cmd, 8, buf, "mode sense");
|
|
pf->media_status = PF_RW;
|
|
if (buf[3] & 0x80)
|
|
pf->media_status = PF_RO;
|
|
}
|
|
|
|
static void xs(char *buf, char *targ, int offs, int len)
|
|
{
|
|
int j, k, l;
|
|
|
|
j = 0;
|
|
l = 0;
|
|
for (k = 0; k < len; k++)
|
|
if ((buf[k + offs] != 0x20) || (buf[k + offs] != l))
|
|
l = targ[j++] = buf[k + offs];
|
|
if (l == 0x20)
|
|
j--;
|
|
targ[j] = 0;
|
|
}
|
|
|
|
static int xl(char *buf, int offs)
|
|
{
|
|
int v, k;
|
|
|
|
v = 0;
|
|
for (k = 0; k < 4; k++)
|
|
v = v * 256 + (buf[k + offs] & 0xff);
|
|
return v;
|
|
}
|
|
|
|
static void pf_get_capacity(struct pf_unit *pf)
|
|
{
|
|
char rc_cmd[12] = { ATAPI_CAPACITY, pf->lun << 5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
|
|
char buf[8];
|
|
int bs;
|
|
|
|
if (pf_atapi(pf, rc_cmd, 8, buf, "get capacity")) {
|
|
pf->media_status = PF_NM;
|
|
return;
|
|
}
|
|
set_capacity(pf->disk, xl(buf, 0) + 1);
|
|
bs = xl(buf, 4);
|
|
if (bs != 512) {
|
|
set_capacity(pf->disk, 0);
|
|
if (verbose)
|
|
printk("%s: Drive %d, LUN %d,"
|
|
" unsupported block size %d\n",
|
|
pf->name, pf->drive, pf->lun, bs);
|
|
}
|
|
}
|
|
|
|
static int pf_identify(struct pf_unit *pf)
|
|
{
|
|
int dt, s;
|
|
char *ms[2] = { "master", "slave" };
|
|
char mf[10], id[18];
|
|
char id_cmd[12] =
|
|
{ ATAPI_IDENTIFY, pf->lun << 5, 0, 0, 36, 0, 0, 0, 0, 0, 0, 0 };
|
|
char buf[36];
|
|
|
|
s = pf_atapi(pf, id_cmd, 36, buf, "identify");
|
|
if (s)
|
|
return -1;
|
|
|
|
dt = buf[0] & 0x1f;
|
|
if ((dt != 0) && (dt != 7)) {
|
|
if (verbose)
|
|
printk("%s: Drive %d, LUN %d, unsupported type %d\n",
|
|
pf->name, pf->drive, pf->lun, dt);
|
|
return -1;
|
|
}
|
|
|
|
xs(buf, mf, 8, 8);
|
|
xs(buf, id, 16, 16);
|
|
|
|
pf->removable = (buf[1] & 0x80);
|
|
|
|
pf_mode_sense(pf);
|
|
pf_mode_sense(pf);
|
|
pf_mode_sense(pf);
|
|
|
|
pf_get_capacity(pf);
|
|
|
|
printk("%s: %s %s, %s LUN %d, type %d",
|
|
pf->name, mf, id, ms[pf->drive], pf->lun, dt);
|
|
if (pf->removable)
|
|
printk(", removable");
|
|
if (pf->media_status == PF_NM)
|
|
printk(", no media\n");
|
|
else {
|
|
if (pf->media_status == PF_RO)
|
|
printk(", RO");
|
|
printk(", %llu blocks\n",
|
|
(unsigned long long)get_capacity(pf->disk));
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* returns 0, with id set if drive is detected
|
|
-1, if drive detection failed
|
|
*/
|
|
static int pf_probe(struct pf_unit *pf)
|
|
{
|
|
if (pf->drive == -1) {
|
|
for (pf->drive = 0; pf->drive <= 1; pf->drive++)
|
|
if (!pf_reset(pf)) {
|
|
if (pf->lun != -1)
|
|
return pf_identify(pf);
|
|
else
|
|
for (pf->lun = 0; pf->lun < 8; pf->lun++)
|
|
if (!pf_identify(pf))
|
|
return 0;
|
|
}
|
|
} else {
|
|
if (pf_reset(pf))
|
|
return -1;
|
|
if (pf->lun != -1)
|
|
return pf_identify(pf);
|
|
for (pf->lun = 0; pf->lun < 8; pf->lun++)
|
|
if (!pf_identify(pf))
|
|
return 0;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
static int pf_detect(void)
|
|
{
|
|
struct pf_unit *pf = units;
|
|
int k, unit;
|
|
|
|
printk("%s: %s version %s, major %d, cluster %d, nice %d\n",
|
|
name, name, PF_VERSION, major, cluster, nice);
|
|
|
|
par_drv = pi_register_driver(name);
|
|
if (!par_drv) {
|
|
pr_err("failed to register %s driver\n", name);
|
|
return -1;
|
|
}
|
|
k = 0;
|
|
if (pf_drive_count == 0) {
|
|
if (pi_init(pf->pi, 1, -1, -1, -1, -1, -1, pf_scratch, PI_PF,
|
|
verbose, pf->name)) {
|
|
if (!pf_probe(pf) && pf->disk) {
|
|
pf->present = 1;
|
|
k++;
|
|
} else
|
|
pi_release(pf->pi);
|
|
}
|
|
|
|
} else
|
|
for (unit = 0; unit < PF_UNITS; unit++, pf++) {
|
|
int *conf = *drives[unit];
|
|
if (!conf[D_PRT])
|
|
continue;
|
|
if (pi_init(pf->pi, 0, conf[D_PRT], conf[D_MOD],
|
|
conf[D_UNI], conf[D_PRO], conf[D_DLY],
|
|
pf_scratch, PI_PF, verbose, pf->name)) {
|
|
if (pf->disk && !pf_probe(pf)) {
|
|
pf->present = 1;
|
|
k++;
|
|
} else
|
|
pi_release(pf->pi);
|
|
}
|
|
}
|
|
if (k)
|
|
return 0;
|
|
|
|
printk("%s: No ATAPI disk detected\n", name);
|
|
for (pf = units, unit = 0; unit < PF_UNITS; pf++, unit++)
|
|
put_disk(pf->disk);
|
|
pi_unregister_driver(par_drv);
|
|
return -1;
|
|
}
|
|
|
|
/* The i/o request engine */
|
|
|
|
static int pf_start(struct pf_unit *pf, int cmd, int b, int c)
|
|
{
|
|
int i;
|
|
char io_cmd[12] = { cmd, pf->lun << 5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
|
|
|
|
for (i = 0; i < 4; i++) {
|
|
io_cmd[5 - i] = b & 0xff;
|
|
b = b >> 8;
|
|
}
|
|
|
|
io_cmd[8] = c & 0xff;
|
|
io_cmd[7] = (c >> 8) & 0xff;
|
|
|
|
i = pf_command(pf, io_cmd, c * 512, "start i/o");
|
|
|
|
mdelay(1);
|
|
|
|
return i;
|
|
}
|
|
|
|
static int pf_ready(void)
|
|
{
|
|
return (((status_reg(pf_current) & (STAT_BUSY | pf_mask)) == pf_mask));
|
|
}
|
|
|
|
static int pf_queue;
|
|
|
|
static int set_next_request(void)
|
|
{
|
|
struct pf_unit *pf;
|
|
struct request_queue *q;
|
|
int old_pos = pf_queue;
|
|
|
|
do {
|
|
pf = &units[pf_queue];
|
|
q = pf->present ? pf->disk->queue : NULL;
|
|
if (++pf_queue == PF_UNITS)
|
|
pf_queue = 0;
|
|
if (q) {
|
|
pf_req = blk_fetch_request(q);
|
|
if (pf_req)
|
|
break;
|
|
}
|
|
} while (pf_queue != old_pos);
|
|
|
|
return pf_req != NULL;
|
|
}
|
|
|
|
static void pf_end_request(blk_status_t err)
|
|
{
|
|
if (pf_req && !__blk_end_request_cur(pf_req, err))
|
|
pf_req = NULL;
|
|
}
|
|
|
|
static void pf_request(void)
|
|
{
|
|
if (pf_busy)
|
|
return;
|
|
repeat:
|
|
if (!pf_req && !set_next_request())
|
|
return;
|
|
|
|
pf_current = pf_req->rq_disk->private_data;
|
|
pf_block = blk_rq_pos(pf_req);
|
|
pf_run = blk_rq_sectors(pf_req);
|
|
pf_count = blk_rq_cur_sectors(pf_req);
|
|
|
|
if (pf_block + pf_count > get_capacity(pf_req->rq_disk)) {
|
|
pf_end_request(BLK_STS_IOERR);
|
|
goto repeat;
|
|
}
|
|
|
|
pf_cmd = rq_data_dir(pf_req);
|
|
pf_buf = bio_data(pf_req->bio);
|
|
pf_retries = 0;
|
|
|
|
pf_busy = 1;
|
|
if (pf_cmd == READ)
|
|
pi_do_claimed(pf_current->pi, do_pf_read);
|
|
else if (pf_cmd == WRITE)
|
|
pi_do_claimed(pf_current->pi, do_pf_write);
|
|
else {
|
|
pf_busy = 0;
|
|
pf_end_request(BLK_STS_IOERR);
|
|
goto repeat;
|
|
}
|
|
}
|
|
|
|
static void do_pf_request(struct request_queue *q)
|
|
{
|
|
pf_request();
|
|
}
|
|
|
|
static int pf_next_buf(void)
|
|
{
|
|
unsigned long saved_flags;
|
|
|
|
pf_count--;
|
|
pf_run--;
|
|
pf_buf += 512;
|
|
pf_block++;
|
|
if (!pf_run)
|
|
return 1;
|
|
if (!pf_count) {
|
|
spin_lock_irqsave(&pf_spin_lock, saved_flags);
|
|
pf_end_request(0);
|
|
spin_unlock_irqrestore(&pf_spin_lock, saved_flags);
|
|
if (!pf_req)
|
|
return 1;
|
|
pf_count = blk_rq_cur_sectors(pf_req);
|
|
pf_buf = bio_data(pf_req->bio);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static inline void next_request(blk_status_t err)
|
|
{
|
|
unsigned long saved_flags;
|
|
|
|
spin_lock_irqsave(&pf_spin_lock, saved_flags);
|
|
pf_end_request(err);
|
|
pf_busy = 0;
|
|
pf_request();
|
|
spin_unlock_irqrestore(&pf_spin_lock, saved_flags);
|
|
}
|
|
|
|
/* detach from the calling context - in case the spinlock is held */
|
|
static void do_pf_read(void)
|
|
{
|
|
ps_set_intr(do_pf_read_start, NULL, 0, nice);
|
|
}
|
|
|
|
static void do_pf_read_start(void)
|
|
{
|
|
pf_busy = 1;
|
|
|
|
if (pf_start(pf_current, ATAPI_READ_10, pf_block, pf_run)) {
|
|
pi_disconnect(pf_current->pi);
|
|
if (pf_retries < PF_MAX_RETRIES) {
|
|
pf_retries++;
|
|
pi_do_claimed(pf_current->pi, do_pf_read_start);
|
|
return;
|
|
}
|
|
next_request(BLK_STS_IOERR);
|
|
return;
|
|
}
|
|
pf_mask = STAT_DRQ;
|
|
ps_set_intr(do_pf_read_drq, pf_ready, PF_TMO, nice);
|
|
}
|
|
|
|
static void do_pf_read_drq(void)
|
|
{
|
|
while (1) {
|
|
if (pf_wait(pf_current, STAT_BUSY, STAT_DRQ | STAT_ERR,
|
|
"read block", "completion") & STAT_ERR) {
|
|
pi_disconnect(pf_current->pi);
|
|
if (pf_retries < PF_MAX_RETRIES) {
|
|
pf_req_sense(pf_current, 0);
|
|
pf_retries++;
|
|
pi_do_claimed(pf_current->pi, do_pf_read_start);
|
|
return;
|
|
}
|
|
next_request(BLK_STS_IOERR);
|
|
return;
|
|
}
|
|
pi_read_block(pf_current->pi, pf_buf, 512);
|
|
if (pf_next_buf())
|
|
break;
|
|
}
|
|
pi_disconnect(pf_current->pi);
|
|
next_request(0);
|
|
}
|
|
|
|
static void do_pf_write(void)
|
|
{
|
|
ps_set_intr(do_pf_write_start, NULL, 0, nice);
|
|
}
|
|
|
|
static void do_pf_write_start(void)
|
|
{
|
|
pf_busy = 1;
|
|
|
|
if (pf_start(pf_current, ATAPI_WRITE_10, pf_block, pf_run)) {
|
|
pi_disconnect(pf_current->pi);
|
|
if (pf_retries < PF_MAX_RETRIES) {
|
|
pf_retries++;
|
|
pi_do_claimed(pf_current->pi, do_pf_write_start);
|
|
return;
|
|
}
|
|
next_request(BLK_STS_IOERR);
|
|
return;
|
|
}
|
|
|
|
while (1) {
|
|
if (pf_wait(pf_current, STAT_BUSY, STAT_DRQ | STAT_ERR,
|
|
"write block", "data wait") & STAT_ERR) {
|
|
pi_disconnect(pf_current->pi);
|
|
if (pf_retries < PF_MAX_RETRIES) {
|
|
pf_retries++;
|
|
pi_do_claimed(pf_current->pi, do_pf_write_start);
|
|
return;
|
|
}
|
|
next_request(BLK_STS_IOERR);
|
|
return;
|
|
}
|
|
pi_write_block(pf_current->pi, pf_buf, 512);
|
|
if (pf_next_buf())
|
|
break;
|
|
}
|
|
pf_mask = 0;
|
|
ps_set_intr(do_pf_write_done, pf_ready, PF_TMO, nice);
|
|
}
|
|
|
|
static void do_pf_write_done(void)
|
|
{
|
|
if (pf_wait(pf_current, STAT_BUSY, 0, "write block", "done") & STAT_ERR) {
|
|
pi_disconnect(pf_current->pi);
|
|
if (pf_retries < PF_MAX_RETRIES) {
|
|
pf_retries++;
|
|
pi_do_claimed(pf_current->pi, do_pf_write_start);
|
|
return;
|
|
}
|
|
next_request(BLK_STS_IOERR);
|
|
return;
|
|
}
|
|
pi_disconnect(pf_current->pi);
|
|
next_request(0);
|
|
}
|
|
|
|
static int __init pf_init(void)
|
|
{ /* preliminary initialisation */
|
|
struct pf_unit *pf;
|
|
int unit;
|
|
|
|
if (disable)
|
|
return -EINVAL;
|
|
|
|
pf_init_units();
|
|
|
|
if (pf_detect())
|
|
return -ENODEV;
|
|
pf_busy = 0;
|
|
|
|
if (register_blkdev(major, name)) {
|
|
for (pf = units, unit = 0; unit < PF_UNITS; pf++, unit++)
|
|
put_disk(pf->disk);
|
|
return -EBUSY;
|
|
}
|
|
|
|
for (pf = units, unit = 0; unit < PF_UNITS; pf++, unit++) {
|
|
struct gendisk *disk = pf->disk;
|
|
|
|
if (!pf->present)
|
|
continue;
|
|
disk->private_data = pf;
|
|
add_disk(disk);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void __exit pf_exit(void)
|
|
{
|
|
struct pf_unit *pf;
|
|
int unit;
|
|
unregister_blkdev(major, name);
|
|
for (pf = units, unit = 0; unit < PF_UNITS; pf++, unit++) {
|
|
if (!pf->present)
|
|
continue;
|
|
del_gendisk(pf->disk);
|
|
blk_cleanup_queue(pf->disk->queue);
|
|
put_disk(pf->disk);
|
|
pi_release(pf->pi);
|
|
}
|
|
}
|
|
|
|
MODULE_LICENSE("GPL");
|
|
module_init(pf_init)
|
|
module_exit(pf_exit)
|