990 lines
24 KiB
C
990 lines
24 KiB
C
/*
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pf.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 ATAPI disk
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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 ATAPI disk 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 pf 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 1-7 integers as follows:
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drive2
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drive3 <prt>,<pro>,<uni>,<mod>,<slv>,<lun>,<dly>
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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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<slv> ATAPI CDroms 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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<lun> Some ATAPI devices support multiple LUNs.
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One example is the ATAPI PD/CD drive from
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Matshita/Panasonic. This device has a
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CD drive on LUN 0 and a PD drive on LUN 1.
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By default, the driver will search for the
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first LUN with a supported device. Set
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this parameter to force it to use a specific
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LUN. (default -1)
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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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major You may use this parameter to overide the
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default major number (47) 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 "pf").
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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 the
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following command line parameters, with the same values
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as the corresponding module parameters listed above:
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pf.drive0
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pf.drive1
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pf.drive2
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pf.drive3
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pf.cluster
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pf.nice
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In addition, you can use the parameter pf.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 1998.05.03 Changes for SMP. Eliminate sti().
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Fix for drives that don't clear STAT_ERR
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until after next CDB delivered.
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Small change in pf_completion to round
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up transfer size.
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1.02 GRG 1998.06.16 Eliminated an Ugh
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1.03 GRG 1998.08.16 Use HZ in loop timings, extra debugging
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1.04 GRG 1998.09.24 Added jumbo support
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*/
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#define PF_VERSION "1.04"
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#define PF_MAJOR 47
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#define PF_NAME "pf"
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#define PF_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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static int verbose = 0;
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static int major = PF_MAJOR;
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static char *name = PF_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[7] = { 0, 0, 0, -1, -1, -1, -1 };
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static int drive1[7] = { 0, 0, 0, -1, -1, -1, -1 };
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static int drive2[7] = { 0, 0, 0, -1, -1, -1, -1 };
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static int drive3[7] = { 0, 0, 0, -1, -1, -1, -1 };
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static int (*drives[4])[7] = {&drive0, &drive1, &drive2, &drive3};
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static int pf_drive_count;
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enum {D_PRT, D_PRO, D_UNI, D_MOD, D_SLV, D_LUN, D_DLY};
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/* end of parameters */
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#include <linux/module.h>
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#include <linux/init.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>
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#include <linux/spinlock.h>
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#include <linux/blkdev.h>
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#include <linux/blkpg.h>
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#include <asm/uaccess.h>
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static spinlock_t pf_spin_lock;
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module_param(verbose, bool, 0644);
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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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#include "pseudo.h"
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/* constants for faking geometry numbers */
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#define PF_FD_MAX 8192 /* use FD geometry under this size */
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#define PF_FD_HDS 2
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#define PF_FD_SPT 18
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#define PF_HD_HDS 64
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#define PF_HD_SPT 32
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#define PF_MAX_RETRIES 5
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#define PF_TMO 800 /* interrupt timeout in jiffies */
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#define PF_SPIN_DEL 50 /* spin delay in micro-seconds */
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#define PF_SPIN (1000000*PF_TMO)/(HZ*PF_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 ATAPI_REQ_SENSE 0x03
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#define ATAPI_LOCK 0x1e
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#define ATAPI_DOOR 0x1b
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#define ATAPI_MODE_SENSE 0x5a
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#define ATAPI_CAPACITY 0x25
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#define ATAPI_IDENTIFY 0x12
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#define ATAPI_READ_10 0x28
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#define ATAPI_WRITE_10 0x2a
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static int pf_open(struct inode *inode, struct file *file);
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static void do_pf_request(request_queue_t * q);
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static int pf_ioctl(struct inode *inode, struct file *file,
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unsigned int cmd, unsigned long arg);
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static int pf_getgeo(struct block_device *bdev, struct hd_geometry *geo);
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static int pf_release(struct inode *inode, struct file *file);
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static int pf_detect(void);
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static void do_pf_read(void);
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static void do_pf_read_start(void);
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static void do_pf_write(void);
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static void do_pf_write_start(void);
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static void do_pf_read_drq(void);
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static void do_pf_write_done(void);
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#define PF_NM 0
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#define PF_RO 1
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#define PF_RW 2
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#define PF_NAMELEN 8
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struct pf_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 removable; /* removable media device ? */
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int media_status; /* media present ? WP ? */
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int drive; /* drive */
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int lun;
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int access; /* count of active opens ... */
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int present; /* device present ? */
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char name[PF_NAMELEN]; /* pf0, pf1, ... */
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struct gendisk *disk;
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};
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static struct pf_unit units[PF_UNITS];
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static int pf_identify(struct pf_unit *pf);
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static void pf_lock(struct pf_unit *pf, int func);
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static void pf_eject(struct pf_unit *pf);
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static int pf_check_media(struct gendisk *disk);
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static char pf_scratch[512]; /* scratch block buffer */
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/* the variables below are used mainly in the I/O request engine, which
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processes only one request at a time.
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*/
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static int pf_retries = 0; /* i/o error retry count */
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static int pf_busy = 0; /* request being processed ? */
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static struct request *pf_req; /* current request */
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static int pf_block; /* address of next requested block */
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static int pf_count; /* number of blocks still to do */
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static int pf_run; /* sectors in current cluster */
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static int pf_cmd; /* current command READ/WRITE */
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static struct pf_unit *pf_current;/* unit of current request */
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static int pf_mask; /* stopper for pseudo-int */
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static char *pf_buf; /* buffer for request in progress */
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/* kernel glue structures */
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static struct block_device_operations pf_fops = {
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.owner = THIS_MODULE,
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.open = pf_open,
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.release = pf_release,
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.ioctl = pf_ioctl,
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.getgeo = pf_getgeo,
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.media_changed = pf_check_media,
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};
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static void __init pf_init_units(void)
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{
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struct pf_unit *pf;
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int unit;
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pf_drive_count = 0;
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for (unit = 0, pf = units; unit < PF_UNITS; unit++, pf++) {
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struct gendisk *disk = alloc_disk(1);
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if (!disk)
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continue;
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pf->disk = disk;
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pf->pi = &pf->pia;
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pf->media_status = PF_NM;
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pf->drive = (*drives[unit])[D_SLV];
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pf->lun = (*drives[unit])[D_LUN];
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snprintf(pf->name, PF_NAMELEN, "%s%d", name, unit);
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disk->major = major;
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disk->first_minor = unit;
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strcpy(disk->disk_name, pf->name);
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disk->fops = &pf_fops;
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if (!(*drives[unit])[D_PRT])
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pf_drive_count++;
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}
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}
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static int pf_open(struct inode *inode, struct file *file)
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{
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struct pf_unit *pf = inode->i_bdev->bd_disk->private_data;
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pf_identify(pf);
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if (pf->media_status == PF_NM)
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return -ENODEV;
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if ((pf->media_status == PF_RO) && (file->f_mode & 2))
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return -EROFS;
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pf->access++;
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if (pf->removable)
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pf_lock(pf, 1);
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return 0;
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}
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static int pf_getgeo(struct block_device *bdev, struct hd_geometry *geo)
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{
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struct pf_unit *pf = bdev->bd_disk->private_data;
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sector_t capacity = get_capacity(pf->disk);
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if (capacity < PF_FD_MAX) {
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geo->cylinders = sector_div(capacity, PF_FD_HDS * PF_FD_SPT);
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geo->heads = PF_FD_HDS;
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geo->sectors = PF_FD_SPT;
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} else {
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geo->cylinders = sector_div(capacity, PF_HD_HDS * PF_HD_SPT);
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geo->heads = PF_HD_HDS;
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geo->sectors = PF_HD_SPT;
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}
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return 0;
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}
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static int pf_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
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{
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struct pf_unit *pf = inode->i_bdev->bd_disk->private_data;
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if (cmd != CDROMEJECT)
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return -EINVAL;
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if (pf->access != 1)
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return -EBUSY;
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pf_eject(pf);
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return 0;
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}
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static int pf_release(struct inode *inode, struct file *file)
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{
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struct pf_unit *pf = inode->i_bdev->bd_disk->private_data;
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if (pf->access <= 0)
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return -EINVAL;
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pf->access--;
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if (!pf->access && pf->removable)
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pf_lock(pf, 0);
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return 0;
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}
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static int pf_check_media(struct gendisk *disk)
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{
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return 1;
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}
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static inline int status_reg(struct pf_unit *pf)
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{
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return pi_read_regr(pf->pi, 1, 6);
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}
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static inline int read_reg(struct pf_unit *pf, int reg)
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{
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return pi_read_regr(pf->pi, 0, reg);
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}
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static inline void write_reg(struct pf_unit *pf, int reg, int val)
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{
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pi_write_regr(pf->pi, 0, reg, val);
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}
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static int pf_wait(struct pf_unit *pf, int go, int stop, char *fun, char *msg)
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{
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int j, r, e, s, p;
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j = 0;
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while ((((r = status_reg(pf)) & go) || (stop && (!(r & stop))))
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&& (j++ < PF_SPIN))
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udelay(PF_SPIN_DEL);
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if ((r & (STAT_ERR & stop)) || (j >= PF_SPIN)) {
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s = read_reg(pf, 7);
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e = read_reg(pf, 1);
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p = read_reg(pf, 2);
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if (j >= PF_SPIN)
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e |= 0x100;
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if (fun)
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printk("%s: %s %s: alt=0x%x stat=0x%x err=0x%x"
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" loop=%d phase=%d\n",
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pf->name, fun, msg, r, s, e, j, p);
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return (e << 8) + s;
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}
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return 0;
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}
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static int pf_command(struct pf_unit *pf, char *cmd, int dlen, char *fun)
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{
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pi_connect(pf->pi);
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write_reg(pf, 6, 0xa0+0x10*pf->drive);
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if (pf_wait(pf, STAT_BUSY | STAT_DRQ, 0, fun, "before command")) {
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pi_disconnect(pf->pi);
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return -1;
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}
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write_reg(pf, 4, dlen % 256);
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write_reg(pf, 5, dlen / 256);
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write_reg(pf, 7, 0xa0); /* ATAPI packet command */
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if (pf_wait(pf, STAT_BUSY, STAT_DRQ, fun, "command DRQ")) {
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pi_disconnect(pf->pi);
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return -1;
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}
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if (read_reg(pf, 2) != 1) {
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printk("%s: %s: command phase error\n", pf->name, fun);
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pi_disconnect(pf->pi);
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return -1;
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}
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pi_write_block(pf->pi, cmd, 12);
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return 0;
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}
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static int pf_completion(struct pf_unit *pf, char *buf, char *fun)
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{
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int r, s, n;
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r = pf_wait(pf, STAT_BUSY, STAT_DRQ | STAT_READY | STAT_ERR,
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fun, "completion");
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if ((read_reg(pf, 2) & 2) && (read_reg(pf, 7) & STAT_DRQ)) {
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n = (((read_reg(pf, 4) + 256 * read_reg(pf, 5)) +
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3) & 0xfffc);
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pi_read_block(pf->pi, buf, n);
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}
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s = pf_wait(pf, STAT_BUSY, STAT_READY | STAT_ERR, fun, "data done");
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pi_disconnect(pf->pi);
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return (r ? r : s);
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}
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static void pf_req_sense(struct pf_unit *pf, int quiet)
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{
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char rs_cmd[12] =
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{ ATAPI_REQ_SENSE, pf->lun << 5, 0, 0, 16, 0, 0, 0, 0, 0, 0, 0 };
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char buf[16];
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int r;
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r = pf_command(pf, rs_cmd, 16, "Request sense");
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mdelay(1);
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if (!r)
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pf_completion(pf, buf, "Request sense");
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if ((!r) && (!quiet))
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printk("%s: Sense key: %x, ASC: %x, ASQ: %x\n",
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pf->name, buf[2] & 0xf, buf[12], buf[13]);
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}
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static int pf_atapi(struct pf_unit *pf, char *cmd, int dlen, char *buf, char *fun)
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{
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int r;
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r = pf_command(pf, cmd, dlen, fun);
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mdelay(1);
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if (!r)
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r = pf_completion(pf, buf, fun);
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if (r)
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pf_req_sense(pf, !fun);
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return r;
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}
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#define DBMSG(msg) ((verbose>1)?(msg):NULL)
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static void pf_lock(struct pf_unit *pf, int func)
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{
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char lo_cmd[12] = { ATAPI_LOCK, pf->lun << 5, 0, 0, func, 0, 0, 0, 0, 0, 0, 0 };
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pf_atapi(pf, lo_cmd, 0, pf_scratch, func ? "unlock" : "lock");
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}
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static void pf_eject(struct pf_unit *pf)
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{
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char ej_cmd[12] = { ATAPI_DOOR, pf->lun << 5, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0 };
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pf_lock(pf, 0);
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pf_atapi(pf, ej_cmd, 0, pf_scratch, "eject");
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}
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#define PF_RESET_TMO 30 /* in tenths of a second */
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static void pf_sleep(int cs)
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{
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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, DBMSG("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, DBMSG("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);
|
|
|
|
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);
|
|
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 struct request_queue *pf_queue;
|
|
|
|
static void pf_end_request(int uptodate)
|
|
{
|
|
if (pf_req) {
|
|
end_request(pf_req, uptodate);
|
|
pf_req = NULL;
|
|
}
|
|
}
|
|
|
|
static void do_pf_request(request_queue_t * q)
|
|
{
|
|
if (pf_busy)
|
|
return;
|
|
repeat:
|
|
pf_req = elv_next_request(q);
|
|
if (!pf_req)
|
|
return;
|
|
|
|
pf_current = pf_req->rq_disk->private_data;
|
|
pf_block = pf_req->sector;
|
|
pf_run = pf_req->nr_sectors;
|
|
pf_count = pf_req->current_nr_sectors;
|
|
|
|
if (pf_block + pf_count > get_capacity(pf_req->rq_disk)) {
|
|
pf_end_request(0);
|
|
goto repeat;
|
|
}
|
|
|
|
pf_cmd = rq_data_dir(pf_req);
|
|
pf_buf = pf_req->buffer;
|
|
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(0);
|
|
goto repeat;
|
|
}
|
|
}
|
|
|
|
static int pf_next_buf(void)
|
|
{
|
|
unsigned long saved_flags;
|
|
|
|
pf_count--;
|
|
pf_run--;
|
|
pf_buf += 512;
|
|
pf_block++;
|
|
if (!pf_run)
|
|
return 0;
|
|
if (!pf_count)
|
|
return 1;
|
|
spin_lock_irqsave(&pf_spin_lock, saved_flags);
|
|
pf_end_request(1);
|
|
spin_unlock_irqrestore(&pf_spin_lock, saved_flags);
|
|
return 1;
|
|
}
|
|
|
|
static inline void next_request(int success)
|
|
{
|
|
unsigned long saved_flags;
|
|
|
|
spin_lock_irqsave(&pf_spin_lock, saved_flags);
|
|
pf_end_request(success);
|
|
pf_busy = 0;
|
|
do_pf_request(pf_queue);
|
|
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(0);
|
|
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(0);
|
|
return;
|
|
}
|
|
pi_read_block(pf_current->pi, pf_buf, 512);
|
|
if (pf_next_buf())
|
|
break;
|
|
}
|
|
pi_disconnect(pf_current->pi);
|
|
next_request(1);
|
|
}
|
|
|
|
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(0);
|
|
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(0);
|
|
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(0);
|
|
return;
|
|
}
|
|
pi_disconnect(pf_current->pi);
|
|
next_request(1);
|
|
}
|
|
|
|
static int __init pf_init(void)
|
|
{ /* preliminary initialisation */
|
|
struct pf_unit *pf;
|
|
int unit;
|
|
|
|
if (disable)
|
|
return -1;
|
|
|
|
pf_init_units();
|
|
|
|
if (pf_detect())
|
|
return -1;
|
|
pf_busy = 0;
|
|
|
|
if (register_blkdev(major, name)) {
|
|
for (pf = units, unit = 0; unit < PF_UNITS; pf++, unit++)
|
|
put_disk(pf->disk);
|
|
return -1;
|
|
}
|
|
pf_queue = blk_init_queue(do_pf_request, &pf_spin_lock);
|
|
if (!pf_queue) {
|
|
unregister_blkdev(major, name);
|
|
for (pf = units, unit = 0; unit < PF_UNITS; pf++, unit++)
|
|
put_disk(pf->disk);
|
|
return -1;
|
|
}
|
|
|
|
blk_queue_max_phys_segments(pf_queue, cluster);
|
|
blk_queue_max_hw_segments(pf_queue, cluster);
|
|
|
|
for (pf = units, unit = 0; unit < PF_UNITS; pf++, unit++) {
|
|
struct gendisk *disk = pf->disk;
|
|
|
|
if (!pf->present)
|
|
continue;
|
|
disk->private_data = pf;
|
|
disk->queue = pf_queue;
|
|
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);
|
|
put_disk(pf->disk);
|
|
pi_release(pf->pi);
|
|
}
|
|
blk_cleanup_queue(pf_queue);
|
|
}
|
|
|
|
MODULE_LICENSE("GPL");
|
|
module_init(pf_init)
|
|
module_exit(pf_exit)
|