![Arnd Bergmann](/assets/img/avatar_default.png)
gcc-6.0 found an ancient bug in the paride driver, which had a
"module_param(verbose, bool, 0);" since before 2.6.12, but actually uses
it to accept '0', '1' or '2' as arguments:
drivers/block/paride/pd.c: In function 'pd_init_dev_parms':
drivers/block/paride/pd.c:298:29: warning: comparison of constant '1' with boolean expression is always false [-Wbool-compare]
#define DBMSG(msg) ((verbose>1)?(msg):NULL)
In 2012, Rusty did a cleanup patch that also changed the type of the
variable to 'bool', which introduced what is now a gcc warning.
This changes the type back to 'int' and adapts the module_param() line
instead, so it should work as documented in case anyone ever cares about
running the ancient driver with debugging.
Fixes: 90ab5ee941
("module_param: make bool parameters really bool (drivers & misc)")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Rusty Russell <rusty@rustcorp.com.au>
Cc: Tim Waugh <tim@cyberelk.net>
Cc: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Cc: Jens Axboe <axboe@fb.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
969 lines
24 KiB
C
969 lines
24 KiB
C
/*
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pd.c (c) 1997-8 Grant R. Guenther <grant@torque.net>
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Under the terms of the GNU General Public License.
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This is the high-level driver for parallel port IDE hard
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drives based on chips supported by the paride module.
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By default, the driver will autoprobe for a single parallel
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port IDE drive, but if their individual parameters are
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specified, the driver can handle up to 4 drives.
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The behaviour of the pd driver can be altered by setting
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some parameters from the insmod command line. The following
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parameters are adjustable:
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drive0 These four arguments can be arrays of
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drive1 1-8 integers as follows:
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drive2
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drive3 <prt>,<pro>,<uni>,<mod>,<geo>,<sby>,<dly>,<slv>
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Where,
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<prt> is the base of the parallel port address for
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the corresponding drive. (required)
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<pro> is the protocol number for the adapter that
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supports this drive. These numbers are
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logged by 'paride' when the protocol modules
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are initialised. (0 if not given)
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<uni> for those adapters that support chained
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devices, this is the unit selector for the
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chain of devices on the given port. It should
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be zero for devices that don't support chaining.
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(0 if not given)
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<mod> this can be -1 to choose the best mode, or one
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of the mode numbers supported by the adapter.
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(-1 if not given)
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<geo> this defaults to 0 to indicate that the driver
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should use the CHS geometry provided by the drive
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itself. If set to 1, the driver will provide
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a logical geometry with 64 heads and 32 sectors
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per track, to be consistent with most SCSI
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drivers. (0 if not given)
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<sby> set this to zero to disable the power saving
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standby mode, if needed. (1 if not given)
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<dly> some parallel ports require the driver to
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go more slowly. -1 sets a default value that
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should work with the chosen protocol. Otherwise,
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set this to a small integer, the larger it is
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the slower the port i/o. In some cases, setting
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this to zero will speed up the device. (default -1)
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<slv> IDE disks can be jumpered to master or slave.
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Set this to 0 to choose the master drive, 1 to
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choose the slave, -1 (the default) to choose the
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first drive found.
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major You may use this parameter to overide the
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default major number (45) that this driver
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will use. Be sure to change the device
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name as well.
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name This parameter is a character string that
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contains the name the kernel will use for this
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device (in /proc output, for instance).
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(default "pd")
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cluster The driver will attempt to aggregate requests
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for adjacent blocks into larger multi-block
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clusters. The maximum cluster size (in 512
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byte sectors) is set with this parameter.
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(default 64)
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verbose This parameter controls the amount of logging
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that the driver will do. Set it to 0 for
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normal operation, 1 to see autoprobe progress
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messages, or 2 to see additional debugging
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output. (default 0)
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nice This parameter controls the driver's use of
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idle CPU time, at the expense of some speed.
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If this driver is built into the kernel, you can use kernel
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the following command line parameters, with the same values
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as the corresponding module parameters listed above:
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pd.drive0
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pd.drive1
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pd.drive2
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pd.drive3
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pd.cluster
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pd.nice
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In addition, you can use the parameter pd.disable to disable
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the driver entirely.
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*/
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/* Changes:
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1.01 GRG 1997.01.24 Restored pd_reset()
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Added eject ioctl
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1.02 GRG 1998.05.06 SMP spinlock changes,
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Added slave support
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1.03 GRG 1998.06.16 Eliminate an Ugh.
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1.04 GRG 1998.08.15 Extra debugging, use HZ in loop timing
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1.05 GRG 1998.09.24 Added jumbo support
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*/
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#define PD_VERSION "1.05"
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#define PD_MAJOR 45
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#define PD_NAME "pd"
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#define PD_UNITS 4
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/* Here are things one can override from the insmod command.
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Most are autoprobed by paride unless set here. Verbose is off
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by default.
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*/
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#include <linux/types.h>
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static int verbose = 0;
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static int major = PD_MAJOR;
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static char *name = PD_NAME;
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static int cluster = 64;
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static int nice = 0;
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static int disable = 0;
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static int drive0[8] = { 0, 0, 0, -1, 0, 1, -1, -1 };
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static int drive1[8] = { 0, 0, 0, -1, 0, 1, -1, -1 };
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static int drive2[8] = { 0, 0, 0, -1, 0, 1, -1, -1 };
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static int drive3[8] = { 0, 0, 0, -1, 0, 1, -1, -1 };
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static int (*drives[4])[8] = {&drive0, &drive1, &drive2, &drive3};
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enum {D_PRT, D_PRO, D_UNI, D_MOD, D_GEO, D_SBY, D_DLY, D_SLV};
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/* end of parameters */
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/gfp.h>
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#include <linux/fs.h>
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#include <linux/delay.h>
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#include <linux/hdreg.h>
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#include <linux/cdrom.h> /* for the eject ioctl */
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#include <linux/blkdev.h>
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#include <linux/blkpg.h>
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#include <linux/kernel.h>
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#include <linux/mutex.h>
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#include <asm/uaccess.h>
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#include <linux/workqueue.h>
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static DEFINE_MUTEX(pd_mutex);
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static DEFINE_SPINLOCK(pd_lock);
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module_param(verbose, int, 0);
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module_param(major, int, 0);
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module_param(name, charp, 0);
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module_param(cluster, int, 0);
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module_param(nice, int, 0);
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module_param_array(drive0, int, NULL, 0);
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module_param_array(drive1, int, NULL, 0);
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module_param_array(drive2, int, NULL, 0);
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module_param_array(drive3, int, NULL, 0);
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#include "paride.h"
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#define PD_BITS 4
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/* numbers for "SCSI" geometry */
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#define PD_LOG_HEADS 64
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#define PD_LOG_SECTS 32
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#define PD_ID_OFF 54
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#define PD_ID_LEN 14
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#define PD_MAX_RETRIES 5
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#define PD_TMO 800 /* interrupt timeout in jiffies */
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#define PD_SPIN_DEL 50 /* spin delay in micro-seconds */
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#define PD_SPIN (1000000*PD_TMO)/(HZ*PD_SPIN_DEL)
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#define STAT_ERR 0x00001
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#define STAT_INDEX 0x00002
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#define STAT_ECC 0x00004
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#define STAT_DRQ 0x00008
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#define STAT_SEEK 0x00010
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#define STAT_WRERR 0x00020
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#define STAT_READY 0x00040
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#define STAT_BUSY 0x00080
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#define ERR_AMNF 0x00100
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#define ERR_TK0NF 0x00200
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#define ERR_ABRT 0x00400
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#define ERR_MCR 0x00800
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#define ERR_IDNF 0x01000
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#define ERR_MC 0x02000
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#define ERR_UNC 0x04000
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#define ERR_TMO 0x10000
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#define IDE_READ 0x20
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#define IDE_WRITE 0x30
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#define IDE_READ_VRFY 0x40
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#define IDE_INIT_DEV_PARMS 0x91
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#define IDE_STANDBY 0x96
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#define IDE_ACKCHANGE 0xdb
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#define IDE_DOORLOCK 0xde
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#define IDE_DOORUNLOCK 0xdf
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#define IDE_IDENTIFY 0xec
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#define IDE_EJECT 0xed
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#define PD_NAMELEN 8
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struct pd_unit {
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struct pi_adapter pia; /* interface to paride layer */
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struct pi_adapter *pi;
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int access; /* count of active opens ... */
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int capacity; /* Size of this volume in sectors */
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int heads; /* physical geometry */
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int sectors;
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int cylinders;
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int can_lba;
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int drive; /* master=0 slave=1 */
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int changed; /* Have we seen a disk change ? */
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int removable; /* removable media device ? */
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int standby;
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int alt_geom;
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char name[PD_NAMELEN]; /* pda, pdb, etc ... */
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struct gendisk *gd;
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};
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static struct pd_unit pd[PD_UNITS];
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static char pd_scratch[512]; /* scratch block buffer */
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static char *pd_errs[17] = { "ERR", "INDEX", "ECC", "DRQ", "SEEK", "WRERR",
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"READY", "BUSY", "AMNF", "TK0NF", "ABRT", "MCR",
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"IDNF", "MC", "UNC", "???", "TMO"
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};
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static void *par_drv; /* reference of parport driver */
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static inline int status_reg(struct pd_unit *disk)
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{
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return pi_read_regr(disk->pi, 1, 6);
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}
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static inline int read_reg(struct pd_unit *disk, int reg)
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{
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return pi_read_regr(disk->pi, 0, reg);
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}
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static inline void write_status(struct pd_unit *disk, int val)
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{
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pi_write_regr(disk->pi, 1, 6, val);
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}
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static inline void write_reg(struct pd_unit *disk, int reg, int val)
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{
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pi_write_regr(disk->pi, 0, reg, val);
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}
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static inline u8 DRIVE(struct pd_unit *disk)
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{
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return 0xa0+0x10*disk->drive;
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}
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/* ide command interface */
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static void pd_print_error(struct pd_unit *disk, char *msg, int status)
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{
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int i;
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printk("%s: %s: status = 0x%x =", disk->name, msg, status);
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for (i = 0; i < ARRAY_SIZE(pd_errs); i++)
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if (status & (1 << i))
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printk(" %s", pd_errs[i]);
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printk("\n");
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}
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static void pd_reset(struct pd_unit *disk)
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{ /* called only for MASTER drive */
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write_status(disk, 4);
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udelay(50);
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write_status(disk, 0);
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udelay(250);
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}
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#define DBMSG(msg) ((verbose>1)?(msg):NULL)
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static int pd_wait_for(struct pd_unit *disk, int w, char *msg)
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{ /* polled wait */
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int k, r, e;
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k = 0;
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while (k < PD_SPIN) {
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r = status_reg(disk);
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k++;
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if (((r & w) == w) && !(r & STAT_BUSY))
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break;
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udelay(PD_SPIN_DEL);
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}
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e = (read_reg(disk, 1) << 8) + read_reg(disk, 7);
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if (k >= PD_SPIN)
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e |= ERR_TMO;
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if ((e & (STAT_ERR | ERR_TMO)) && (msg != NULL))
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pd_print_error(disk, msg, e);
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return e;
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}
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static void pd_send_command(struct pd_unit *disk, int n, int s, int h, int c0, int c1, int func)
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{
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write_reg(disk, 6, DRIVE(disk) + h);
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write_reg(disk, 1, 0); /* the IDE task file */
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write_reg(disk, 2, n);
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write_reg(disk, 3, s);
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write_reg(disk, 4, c0);
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write_reg(disk, 5, c1);
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write_reg(disk, 7, func);
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udelay(1);
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}
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static void pd_ide_command(struct pd_unit *disk, int func, int block, int count)
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{
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int c1, c0, h, s;
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if (disk->can_lba) {
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s = block & 255;
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c0 = (block >>= 8) & 255;
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c1 = (block >>= 8) & 255;
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h = ((block >>= 8) & 15) + 0x40;
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} else {
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s = (block % disk->sectors) + 1;
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h = (block /= disk->sectors) % disk->heads;
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c0 = (block /= disk->heads) % 256;
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c1 = (block >>= 8);
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}
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pd_send_command(disk, count, s, h, c0, c1, func);
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}
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/* The i/o request engine */
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enum action {Fail = 0, Ok = 1, Hold, Wait};
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static struct request *pd_req; /* current request */
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static enum action (*phase)(void);
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static void run_fsm(void);
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static void ps_tq_int(struct work_struct *work);
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static DECLARE_DELAYED_WORK(fsm_tq, ps_tq_int);
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static void schedule_fsm(void)
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{
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if (!nice)
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schedule_delayed_work(&fsm_tq, 0);
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else
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schedule_delayed_work(&fsm_tq, nice-1);
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}
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static void ps_tq_int(struct work_struct *work)
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{
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run_fsm();
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}
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static enum action do_pd_io_start(void);
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static enum action pd_special(void);
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static enum action do_pd_read_start(void);
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static enum action do_pd_write_start(void);
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static enum action do_pd_read_drq(void);
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static enum action do_pd_write_done(void);
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static struct request_queue *pd_queue;
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static int pd_claimed;
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static struct pd_unit *pd_current; /* current request's drive */
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static PIA *pi_current; /* current request's PIA */
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static void run_fsm(void)
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{
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while (1) {
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enum action res;
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unsigned long saved_flags;
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int stop = 0;
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if (!phase) {
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pd_current = pd_req->rq_disk->private_data;
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pi_current = pd_current->pi;
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phase = do_pd_io_start;
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}
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switch (pd_claimed) {
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case 0:
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pd_claimed = 1;
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if (!pi_schedule_claimed(pi_current, run_fsm))
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return;
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case 1:
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pd_claimed = 2;
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pi_current->proto->connect(pi_current);
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}
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switch(res = phase()) {
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case Ok: case Fail:
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pi_disconnect(pi_current);
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pd_claimed = 0;
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phase = NULL;
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spin_lock_irqsave(&pd_lock, saved_flags);
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if (!__blk_end_request_cur(pd_req,
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res == Ok ? 0 : -EIO)) {
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pd_req = blk_fetch_request(pd_queue);
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if (!pd_req)
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stop = 1;
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}
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spin_unlock_irqrestore(&pd_lock, saved_flags);
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if (stop)
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return;
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case Hold:
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schedule_fsm();
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return;
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case Wait:
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pi_disconnect(pi_current);
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pd_claimed = 0;
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}
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}
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}
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static int pd_retries = 0; /* i/o error retry count */
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static int pd_block; /* address of next requested block */
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static int pd_count; /* number of blocks still to do */
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static int pd_run; /* sectors in current cluster */
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static int pd_cmd; /* current command READ/WRITE */
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static char *pd_buf; /* buffer for request in progress */
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static enum action do_pd_io_start(void)
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{
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if (pd_req->cmd_type == REQ_TYPE_DRV_PRIV) {
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phase = pd_special;
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return pd_special();
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}
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pd_cmd = rq_data_dir(pd_req);
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if (pd_cmd == READ || pd_cmd == WRITE) {
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pd_block = blk_rq_pos(pd_req);
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pd_count = blk_rq_cur_sectors(pd_req);
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if (pd_block + pd_count > get_capacity(pd_req->rq_disk))
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return Fail;
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pd_run = blk_rq_sectors(pd_req);
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pd_buf = bio_data(pd_req->bio);
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pd_retries = 0;
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if (pd_cmd == READ)
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return do_pd_read_start();
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else
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return do_pd_write_start();
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}
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return Fail;
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}
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static enum action pd_special(void)
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{
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enum action (*func)(struct pd_unit *) = pd_req->special;
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return func(pd_current);
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}
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static int pd_next_buf(void)
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{
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unsigned long saved_flags;
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pd_count--;
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pd_run--;
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pd_buf += 512;
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pd_block++;
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if (!pd_run)
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return 1;
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if (pd_count)
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return 0;
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spin_lock_irqsave(&pd_lock, saved_flags);
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__blk_end_request_cur(pd_req, 0);
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pd_count = blk_rq_cur_sectors(pd_req);
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pd_buf = bio_data(pd_req->bio);
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spin_unlock_irqrestore(&pd_lock, saved_flags);
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return 0;
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}
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static unsigned long pd_timeout;
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static enum action do_pd_read_start(void)
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{
|
|
if (pd_wait_for(pd_current, STAT_READY, "do_pd_read") & STAT_ERR) {
|
|
if (pd_retries < PD_MAX_RETRIES) {
|
|
pd_retries++;
|
|
return Wait;
|
|
}
|
|
return Fail;
|
|
}
|
|
pd_ide_command(pd_current, IDE_READ, pd_block, pd_run);
|
|
phase = do_pd_read_drq;
|
|
pd_timeout = jiffies + PD_TMO;
|
|
return Hold;
|
|
}
|
|
|
|
static enum action do_pd_write_start(void)
|
|
{
|
|
if (pd_wait_for(pd_current, STAT_READY, "do_pd_write") & STAT_ERR) {
|
|
if (pd_retries < PD_MAX_RETRIES) {
|
|
pd_retries++;
|
|
return Wait;
|
|
}
|
|
return Fail;
|
|
}
|
|
pd_ide_command(pd_current, IDE_WRITE, pd_block, pd_run);
|
|
while (1) {
|
|
if (pd_wait_for(pd_current, STAT_DRQ, "do_pd_write_drq") & STAT_ERR) {
|
|
if (pd_retries < PD_MAX_RETRIES) {
|
|
pd_retries++;
|
|
return Wait;
|
|
}
|
|
return Fail;
|
|
}
|
|
pi_write_block(pd_current->pi, pd_buf, 512);
|
|
if (pd_next_buf())
|
|
break;
|
|
}
|
|
phase = do_pd_write_done;
|
|
pd_timeout = jiffies + PD_TMO;
|
|
return Hold;
|
|
}
|
|
|
|
static inline int pd_ready(void)
|
|
{
|
|
return !(status_reg(pd_current) & STAT_BUSY);
|
|
}
|
|
|
|
static enum action do_pd_read_drq(void)
|
|
{
|
|
if (!pd_ready() && !time_after_eq(jiffies, pd_timeout))
|
|
return Hold;
|
|
|
|
while (1) {
|
|
if (pd_wait_for(pd_current, STAT_DRQ, "do_pd_read_drq") & STAT_ERR) {
|
|
if (pd_retries < PD_MAX_RETRIES) {
|
|
pd_retries++;
|
|
phase = do_pd_read_start;
|
|
return Wait;
|
|
}
|
|
return Fail;
|
|
}
|
|
pi_read_block(pd_current->pi, pd_buf, 512);
|
|
if (pd_next_buf())
|
|
break;
|
|
}
|
|
return Ok;
|
|
}
|
|
|
|
static enum action do_pd_write_done(void)
|
|
{
|
|
if (!pd_ready() && !time_after_eq(jiffies, pd_timeout))
|
|
return Hold;
|
|
|
|
if (pd_wait_for(pd_current, STAT_READY, "do_pd_write_done") & STAT_ERR) {
|
|
if (pd_retries < PD_MAX_RETRIES) {
|
|
pd_retries++;
|
|
phase = do_pd_write_start;
|
|
return Wait;
|
|
}
|
|
return Fail;
|
|
}
|
|
return Ok;
|
|
}
|
|
|
|
/* special io requests */
|
|
|
|
/* According to the ATA standard, the default CHS geometry should be
|
|
available following a reset. Some Western Digital drives come up
|
|
in a mode where only LBA addresses are accepted until the device
|
|
parameters are initialised.
|
|
*/
|
|
|
|
static void pd_init_dev_parms(struct pd_unit *disk)
|
|
{
|
|
pd_wait_for(disk, 0, DBMSG("before init_dev_parms"));
|
|
pd_send_command(disk, disk->sectors, 0, disk->heads - 1, 0, 0,
|
|
IDE_INIT_DEV_PARMS);
|
|
udelay(300);
|
|
pd_wait_for(disk, 0, "Initialise device parameters");
|
|
}
|
|
|
|
static enum action pd_door_lock(struct pd_unit *disk)
|
|
{
|
|
if (!(pd_wait_for(disk, STAT_READY, "Lock") & STAT_ERR)) {
|
|
pd_send_command(disk, 1, 0, 0, 0, 0, IDE_DOORLOCK);
|
|
pd_wait_for(disk, STAT_READY, "Lock done");
|
|
}
|
|
return Ok;
|
|
}
|
|
|
|
static enum action pd_door_unlock(struct pd_unit *disk)
|
|
{
|
|
if (!(pd_wait_for(disk, STAT_READY, "Lock") & STAT_ERR)) {
|
|
pd_send_command(disk, 1, 0, 0, 0, 0, IDE_DOORUNLOCK);
|
|
pd_wait_for(disk, STAT_READY, "Lock done");
|
|
}
|
|
return Ok;
|
|
}
|
|
|
|
static enum action pd_eject(struct pd_unit *disk)
|
|
{
|
|
pd_wait_for(disk, 0, DBMSG("before unlock on eject"));
|
|
pd_send_command(disk, 1, 0, 0, 0, 0, IDE_DOORUNLOCK);
|
|
pd_wait_for(disk, 0, DBMSG("after unlock on eject"));
|
|
pd_wait_for(disk, 0, DBMSG("before eject"));
|
|
pd_send_command(disk, 0, 0, 0, 0, 0, IDE_EJECT);
|
|
pd_wait_for(disk, 0, DBMSG("after eject"));
|
|
return Ok;
|
|
}
|
|
|
|
static enum action pd_media_check(struct pd_unit *disk)
|
|
{
|
|
int r = pd_wait_for(disk, STAT_READY, DBMSG("before media_check"));
|
|
if (!(r & STAT_ERR)) {
|
|
pd_send_command(disk, 1, 1, 0, 0, 0, IDE_READ_VRFY);
|
|
r = pd_wait_for(disk, STAT_READY, DBMSG("RDY after READ_VRFY"));
|
|
} else
|
|
disk->changed = 1; /* say changed if other error */
|
|
if (r & ERR_MC) {
|
|
disk->changed = 1;
|
|
pd_send_command(disk, 1, 0, 0, 0, 0, IDE_ACKCHANGE);
|
|
pd_wait_for(disk, STAT_READY, DBMSG("RDY after ACKCHANGE"));
|
|
pd_send_command(disk, 1, 1, 0, 0, 0, IDE_READ_VRFY);
|
|
r = pd_wait_for(disk, STAT_READY, DBMSG("RDY after VRFY"));
|
|
}
|
|
return Ok;
|
|
}
|
|
|
|
static void pd_standby_off(struct pd_unit *disk)
|
|
{
|
|
pd_wait_for(disk, 0, DBMSG("before STANDBY"));
|
|
pd_send_command(disk, 0, 0, 0, 0, 0, IDE_STANDBY);
|
|
pd_wait_for(disk, 0, DBMSG("after STANDBY"));
|
|
}
|
|
|
|
static enum action pd_identify(struct pd_unit *disk)
|
|
{
|
|
int j;
|
|
char id[PD_ID_LEN + 1];
|
|
|
|
/* WARNING: here there may be dragons. reset() applies to both drives,
|
|
but we call it only on probing the MASTER. This should allow most
|
|
common configurations to work, but be warned that a reset can clear
|
|
settings on the SLAVE drive.
|
|
*/
|
|
|
|
if (disk->drive == 0)
|
|
pd_reset(disk);
|
|
|
|
write_reg(disk, 6, DRIVE(disk));
|
|
pd_wait_for(disk, 0, DBMSG("before IDENT"));
|
|
pd_send_command(disk, 1, 0, 0, 0, 0, IDE_IDENTIFY);
|
|
|
|
if (pd_wait_for(disk, STAT_DRQ, DBMSG("IDENT DRQ")) & STAT_ERR)
|
|
return Fail;
|
|
pi_read_block(disk->pi, pd_scratch, 512);
|
|
disk->can_lba = pd_scratch[99] & 2;
|
|
disk->sectors = le16_to_cpu(*(__le16 *) (pd_scratch + 12));
|
|
disk->heads = le16_to_cpu(*(__le16 *) (pd_scratch + 6));
|
|
disk->cylinders = le16_to_cpu(*(__le16 *) (pd_scratch + 2));
|
|
if (disk->can_lba)
|
|
disk->capacity = le32_to_cpu(*(__le32 *) (pd_scratch + 120));
|
|
else
|
|
disk->capacity = disk->sectors * disk->heads * disk->cylinders;
|
|
|
|
for (j = 0; j < PD_ID_LEN; j++)
|
|
id[j ^ 1] = pd_scratch[j + PD_ID_OFF];
|
|
j = PD_ID_LEN - 1;
|
|
while ((j >= 0) && (id[j] <= 0x20))
|
|
j--;
|
|
j++;
|
|
id[j] = 0;
|
|
|
|
disk->removable = pd_scratch[0] & 0x80;
|
|
|
|
printk("%s: %s, %s, %d blocks [%dM], (%d/%d/%d), %s media\n",
|
|
disk->name, id,
|
|
disk->drive ? "slave" : "master",
|
|
disk->capacity, disk->capacity / 2048,
|
|
disk->cylinders, disk->heads, disk->sectors,
|
|
disk->removable ? "removable" : "fixed");
|
|
|
|
if (disk->capacity)
|
|
pd_init_dev_parms(disk);
|
|
if (!disk->standby)
|
|
pd_standby_off(disk);
|
|
|
|
return Ok;
|
|
}
|
|
|
|
/* end of io request engine */
|
|
|
|
static void do_pd_request(struct request_queue * q)
|
|
{
|
|
if (pd_req)
|
|
return;
|
|
pd_req = blk_fetch_request(q);
|
|
if (!pd_req)
|
|
return;
|
|
|
|
schedule_fsm();
|
|
}
|
|
|
|
static int pd_special_command(struct pd_unit *disk,
|
|
enum action (*func)(struct pd_unit *disk))
|
|
{
|
|
struct request *rq;
|
|
int err = 0;
|
|
|
|
rq = blk_get_request(disk->gd->queue, READ, __GFP_RECLAIM);
|
|
if (IS_ERR(rq))
|
|
return PTR_ERR(rq);
|
|
|
|
rq->cmd_type = REQ_TYPE_DRV_PRIV;
|
|
rq->special = func;
|
|
|
|
err = blk_execute_rq(disk->gd->queue, disk->gd, rq, 0);
|
|
|
|
blk_put_request(rq);
|
|
return err;
|
|
}
|
|
|
|
/* kernel glue structures */
|
|
|
|
static int pd_open(struct block_device *bdev, fmode_t mode)
|
|
{
|
|
struct pd_unit *disk = bdev->bd_disk->private_data;
|
|
|
|
mutex_lock(&pd_mutex);
|
|
disk->access++;
|
|
|
|
if (disk->removable) {
|
|
pd_special_command(disk, pd_media_check);
|
|
pd_special_command(disk, pd_door_lock);
|
|
}
|
|
mutex_unlock(&pd_mutex);
|
|
return 0;
|
|
}
|
|
|
|
static int pd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
|
|
{
|
|
struct pd_unit *disk = bdev->bd_disk->private_data;
|
|
|
|
if (disk->alt_geom) {
|
|
geo->heads = PD_LOG_HEADS;
|
|
geo->sectors = PD_LOG_SECTS;
|
|
geo->cylinders = disk->capacity / (geo->heads * geo->sectors);
|
|
} else {
|
|
geo->heads = disk->heads;
|
|
geo->sectors = disk->sectors;
|
|
geo->cylinders = disk->cylinders;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pd_ioctl(struct block_device *bdev, fmode_t mode,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct pd_unit *disk = bdev->bd_disk->private_data;
|
|
|
|
switch (cmd) {
|
|
case CDROMEJECT:
|
|
mutex_lock(&pd_mutex);
|
|
if (disk->access == 1)
|
|
pd_special_command(disk, pd_eject);
|
|
mutex_unlock(&pd_mutex);
|
|
return 0;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
static void pd_release(struct gendisk *p, fmode_t mode)
|
|
{
|
|
struct pd_unit *disk = p->private_data;
|
|
|
|
mutex_lock(&pd_mutex);
|
|
if (!--disk->access && disk->removable)
|
|
pd_special_command(disk, pd_door_unlock);
|
|
mutex_unlock(&pd_mutex);
|
|
}
|
|
|
|
static unsigned int pd_check_events(struct gendisk *p, unsigned int clearing)
|
|
{
|
|
struct pd_unit *disk = p->private_data;
|
|
int r;
|
|
if (!disk->removable)
|
|
return 0;
|
|
pd_special_command(disk, pd_media_check);
|
|
r = disk->changed;
|
|
disk->changed = 0;
|
|
return r ? DISK_EVENT_MEDIA_CHANGE : 0;
|
|
}
|
|
|
|
static int pd_revalidate(struct gendisk *p)
|
|
{
|
|
struct pd_unit *disk = p->private_data;
|
|
if (pd_special_command(disk, pd_identify) == 0)
|
|
set_capacity(p, disk->capacity);
|
|
else
|
|
set_capacity(p, 0);
|
|
return 0;
|
|
}
|
|
|
|
static const struct block_device_operations pd_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = pd_open,
|
|
.release = pd_release,
|
|
.ioctl = pd_ioctl,
|
|
.getgeo = pd_getgeo,
|
|
.check_events = pd_check_events,
|
|
.revalidate_disk= pd_revalidate
|
|
};
|
|
|
|
/* probing */
|
|
|
|
static void pd_probe_drive(struct pd_unit *disk)
|
|
{
|
|
struct gendisk *p = alloc_disk(1 << PD_BITS);
|
|
if (!p)
|
|
return;
|
|
strcpy(p->disk_name, disk->name);
|
|
p->fops = &pd_fops;
|
|
p->major = major;
|
|
p->first_minor = (disk - pd) << PD_BITS;
|
|
disk->gd = p;
|
|
p->private_data = disk;
|
|
p->queue = pd_queue;
|
|
|
|
if (disk->drive == -1) {
|
|
for (disk->drive = 0; disk->drive <= 1; disk->drive++)
|
|
if (pd_special_command(disk, pd_identify) == 0)
|
|
return;
|
|
} else if (pd_special_command(disk, pd_identify) == 0)
|
|
return;
|
|
disk->gd = NULL;
|
|
put_disk(p);
|
|
}
|
|
|
|
static int pd_detect(void)
|
|
{
|
|
int found = 0, unit, pd_drive_count = 0;
|
|
struct pd_unit *disk;
|
|
|
|
for (unit = 0; unit < PD_UNITS; unit++) {
|
|
int *parm = *drives[unit];
|
|
struct pd_unit *disk = pd + unit;
|
|
disk->pi = &disk->pia;
|
|
disk->access = 0;
|
|
disk->changed = 1;
|
|
disk->capacity = 0;
|
|
disk->drive = parm[D_SLV];
|
|
snprintf(disk->name, PD_NAMELEN, "%s%c", name, 'a'+unit);
|
|
disk->alt_geom = parm[D_GEO];
|
|
disk->standby = parm[D_SBY];
|
|
if (parm[D_PRT])
|
|
pd_drive_count++;
|
|
}
|
|
|
|
par_drv = pi_register_driver(name);
|
|
if (!par_drv) {
|
|
pr_err("failed to register %s driver\n", name);
|
|
return -1;
|
|
}
|
|
|
|
if (pd_drive_count == 0) { /* nothing spec'd - so autoprobe for 1 */
|
|
disk = pd;
|
|
if (pi_init(disk->pi, 1, -1, -1, -1, -1, -1, pd_scratch,
|
|
PI_PD, verbose, disk->name)) {
|
|
pd_probe_drive(disk);
|
|
if (!disk->gd)
|
|
pi_release(disk->pi);
|
|
}
|
|
|
|
} else {
|
|
for (unit = 0, disk = pd; unit < PD_UNITS; unit++, disk++) {
|
|
int *parm = *drives[unit];
|
|
if (!parm[D_PRT])
|
|
continue;
|
|
if (pi_init(disk->pi, 0, parm[D_PRT], parm[D_MOD],
|
|
parm[D_UNI], parm[D_PRO], parm[D_DLY],
|
|
pd_scratch, PI_PD, verbose, disk->name)) {
|
|
pd_probe_drive(disk);
|
|
if (!disk->gd)
|
|
pi_release(disk->pi);
|
|
}
|
|
}
|
|
}
|
|
for (unit = 0, disk = pd; unit < PD_UNITS; unit++, disk++) {
|
|
if (disk->gd) {
|
|
set_capacity(disk->gd, disk->capacity);
|
|
add_disk(disk->gd);
|
|
found = 1;
|
|
}
|
|
}
|
|
if (!found) {
|
|
printk("%s: no valid drive found\n", name);
|
|
pi_unregister_driver(par_drv);
|
|
}
|
|
return found;
|
|
}
|
|
|
|
static int __init pd_init(void)
|
|
{
|
|
if (disable)
|
|
goto out1;
|
|
|
|
pd_queue = blk_init_queue(do_pd_request, &pd_lock);
|
|
if (!pd_queue)
|
|
goto out1;
|
|
|
|
blk_queue_max_hw_sectors(pd_queue, cluster);
|
|
|
|
if (register_blkdev(major, name))
|
|
goto out2;
|
|
|
|
printk("%s: %s version %s, major %d, cluster %d, nice %d\n",
|
|
name, name, PD_VERSION, major, cluster, nice);
|
|
if (!pd_detect())
|
|
goto out3;
|
|
|
|
return 0;
|
|
|
|
out3:
|
|
unregister_blkdev(major, name);
|
|
out2:
|
|
blk_cleanup_queue(pd_queue);
|
|
out1:
|
|
return -ENODEV;
|
|
}
|
|
|
|
static void __exit pd_exit(void)
|
|
{
|
|
struct pd_unit *disk;
|
|
int unit;
|
|
unregister_blkdev(major, name);
|
|
for (unit = 0, disk = pd; unit < PD_UNITS; unit++, disk++) {
|
|
struct gendisk *p = disk->gd;
|
|
if (p) {
|
|
disk->gd = NULL;
|
|
del_gendisk(p);
|
|
put_disk(p);
|
|
pi_release(disk->pi);
|
|
}
|
|
}
|
|
blk_cleanup_queue(pd_queue);
|
|
}
|
|
|
|
MODULE_LICENSE("GPL");
|
|
module_init(pd_init)
|
|
module_exit(pd_exit)
|