pf.c
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上传用户:ajay2009
上传日期:2009-05-22
资源大小:495k
文件大小:24k
源码类别:
驱动编程
开发平台:
Unix_Linux
- /*
- pf.c (c) 1997-8 Grant R. Guenther <grant@torque.net>
- Under the terms of the GNU General Public License.
- This is the high-level driver for parallel port ATAPI disk
- drives based on chips supported by the paride module.
- By default, the driver will autoprobe for a single parallel
- port ATAPI disk drive, but if their individual parameters are
- specified, the driver can handle up to 4 drives.
- The behaviour of the pf driver can be altered by setting
- some parameters from the insmod command line. The following
- parameters are adjustable:
- drive0 These four arguments can be arrays of
- drive1 1-7 integers as follows:
- drive2
- drive3 <prt>,<pro>,<uni>,<mod>,<slv>,<lun>,<dly>
- Where,
- <prt> is the base of the parallel port address for
- the corresponding drive. (required)
- <pro> is the protocol number for the adapter that
- supports this drive. These numbers are
- logged by 'paride' when the protocol modules
- are initialised. (0 if not given)
- <uni> for those adapters that support chained
- devices, this is the unit selector for the
- chain of devices on the given port. It should
- be zero for devices that don't support chaining.
- (0 if not given)
- <mod> this can be -1 to choose the best mode, or one
- of the mode numbers supported by the adapter.
- (-1 if not given)
- <slv> ATAPI CDroms can be jumpered to master or slave.
- Set this to 0 to choose the master drive, 1 to
- choose the slave, -1 (the default) to choose the
- first drive found.
- <lun> Some ATAPI devices support multiple LUNs.
- One example is the ATAPI PD/CD drive from
- Matshita/Panasonic. This device has a
- CD drive on LUN 0 and a PD drive on LUN 1.
- By default, the driver will search for the
- first LUN with a supported device. Set
- this parameter to force it to use a specific
- LUN. (default -1)
- <dly> some parallel ports require the driver to
- go more slowly. -1 sets a default value that
- should work with the chosen protocol. Otherwise,
- set this to a small integer, the larger it is
- the slower the port i/o. In some cases, setting
- this to zero will speed up the device. (default -1)
- major You may use this parameter to overide the
- default major number (47) that this driver
- will use. Be sure to change the device
- name as well.
- name This parameter is a character string that
- contains the name the kernel will use for this
- device (in /proc output, for instance).
- (default "pf").
- cluster The driver will attempt to aggregate requests
- for adjacent blocks into larger multi-block
- clusters. The maximum cluster size (in 512
- byte sectors) is set with this parameter.
- (default 64)
- verbose This parameter controls the amount of logging
- that the driver will do. Set it to 0 for
- normal operation, 1 to see autoprobe progress
- messages, or 2 to see additional debugging
- output. (default 0)
- nice This parameter controls the driver's use of
- idle CPU time, at the expense of some speed.
- If this driver is built into the kernel, you can use the
- following command line parameters, with the same values
- as the corresponding module parameters listed above:
- pf.drive0
- pf.drive1
- pf.drive2
- pf.drive3
- pf.cluster
- pf.nice
- In addition, you can use the parameter pf.disable to disable
- the driver entirely.
- */
- /* Changes:
- 1.01 GRG 1998.05.03 Changes for SMP. Eliminate sti().
- Fix for drives that don't clear STAT_ERR
- until after next CDB delivered.
- Small change in pf_completion to round
- up transfer size.
- 1.02 GRG 1998.06.16 Eliminated an Ugh
- 1.03 GRG 1998.08.16 Use HZ in loop timings, extra debugging
- 1.04 GRG 1998.09.24 Added jumbo support
- */
- #define PF_VERSION "1.04"
- #define PF_MAJOR 47
- #define PF_NAME "pf"
- #define PF_UNITS 4
- /* Here are things one can override from the insmod command.
- Most are autoprobed by paride unless set here. Verbose is off
- by default.
- */
- static int verbose = 0;
- static int major = PF_MAJOR;
- static char *name = PF_NAME;
- static int cluster = 64;
- static int nice = 0;
- static int disable = 0;
- static int drive0[7] = { 0, 0, 0, -1, -1, -1, -1 };
- static int drive1[7] = { 0, 0, 0, -1, -1, -1, -1 };
- static int drive2[7] = { 0, 0, 0, -1, -1, -1, -1 };
- static int drive3[7] = { 0, 0, 0, -1, -1, -1, -1 };
- static int (*drives[4])[7] = {&drive0, &drive1, &drive2, &drive3};
- static int pf_drive_count;
- enum {D_PRT, D_PRO, D_UNI, D_MOD, D_SLV, D_LUN, D_DLY};
- /* end of parameters */
- #include <linux/module.h>
- #include <linux/init.h>
- #include <linux/fs.h>
- #include <linux/delay.h>
- #include <linux/hdreg.h>
- #include <linux/cdrom.h>
- #include <linux/spinlock.h>
- #include <linux/blkdev.h>
- #include <linux/blkpg.h>
- #include <asm/uaccess.h>
- static spinlock_t pf_spin_lock;
- module_param(verbose, bool, 0644);
- module_param(major, int, 0);
- module_param(name, charp, 0);
- module_param(cluster, int, 0);
- module_param(nice, int, 0);
- module_param_array(drive0, int, NULL, 0);
- module_param_array(drive1, int, NULL, 0);
- module_param_array(drive2, int, NULL, 0);
- module_param_array(drive3, int, NULL, 0);
- #include "paride.h"
- #include "pseudo.h"
- /* constants for faking geometry numbers */
- #define PF_FD_MAX 8192 /* use FD geometry under this size */
- #define PF_FD_HDS 2
- #define PF_FD_SPT 18
- #define PF_HD_HDS 64
- #define PF_HD_SPT 32
- #define PF_MAX_RETRIES 5
- #define PF_TMO 800 /* interrupt timeout in jiffies */
- #define PF_SPIN_DEL 50 /* spin delay in micro-seconds */
- #define PF_SPIN (1000000*PF_TMO)/(HZ*PF_SPIN_DEL)
- #define STAT_ERR 0x00001
- #define STAT_INDEX 0x00002
- #define STAT_ECC 0x00004
- #define STAT_DRQ 0x00008
- #define STAT_SEEK 0x00010
- #define STAT_WRERR 0x00020
- #define STAT_READY 0x00040
- #define STAT_BUSY 0x00080
- #define ATAPI_REQ_SENSE 0x03
- #define ATAPI_LOCK 0x1e
- #define ATAPI_DOOR 0x1b
- #define ATAPI_MODE_SENSE 0x5a
- #define ATAPI_CAPACITY 0x25
- #define ATAPI_IDENTIFY 0x12
- #define ATAPI_READ_10 0x28
- #define ATAPI_WRITE_10 0x2a
- static int pf_open(struct inode *inode, struct file *file);
- static void do_pf_request(request_queue_t * q);
- static int pf_ioctl(struct inode *inode, struct file *file,
- unsigned int cmd, unsigned long arg);
- static int pf_release(struct inode *inode, struct file *file);
- static int pf_detect(void);
- static void do_pf_read(void);
- static void do_pf_read_start(void);
- static void do_pf_write(void);
- static void do_pf_write_start(void);
- static void do_pf_read_drq(void);
- static void do_pf_write_done(void);
- #define PF_NM 0
- #define PF_RO 1
- #define PF_RW 2
- #define PF_NAMELEN 8
- struct pf_unit {
- struct pi_adapter pia; /* interface to paride layer */
- struct pi_adapter *pi;
- int removable; /* removable media device ? */
- int media_status; /* media present ? WP ? */
- int drive; /* drive */
- int lun;
- int access; /* count of active opens ... */
- int present; /* device present ? */
- char name[PF_NAMELEN]; /* pf0, pf1, ... */
- struct gendisk *disk;
- };
- static struct pf_unit units[PF_UNITS];
- static int pf_identify(struct pf_unit *pf);
- static void pf_lock(struct pf_unit *pf, int func);
- static void pf_eject(struct pf_unit *pf);
- static int pf_check_media(struct gendisk *disk);
- static char pf_scratch[512]; /* scratch block buffer */
- /* the variables below are used mainly in the I/O request engine, which
- processes only one request at a time.
- */
- static int pf_retries = 0; /* i/o error retry count */
- static int pf_busy = 0; /* request being processed ? */
- static struct request *pf_req; /* current request */
- static int pf_block; /* address of next requested block */
- static int pf_count; /* number of blocks still to do */
- static int pf_run; /* sectors in current cluster */
- static int pf_cmd; /* current command READ/WRITE */
- static struct pf_unit *pf_current;/* unit of current request */
- static int pf_mask; /* stopper for pseudo-int */
- static char *pf_buf; /* buffer for request in progress */
- /* kernel glue structures */
- static struct block_device_operations pf_fops = {
- .owner = THIS_MODULE,
- .open = pf_open,
- .release = pf_release,
- .ioctl = pf_ioctl,
- .media_changed = pf_check_media,
- };
- static void __init pf_init_units(void)
- {
- struct pf_unit *pf;
- int unit;
- pf_drive_count = 0;
- for (unit = 0, pf = units; unit < PF_UNITS; unit++, pf++) {
- struct gendisk *disk = alloc_disk(1);
- if (!disk)
- continue;
- pf->disk = disk;
- pf->pi = &pf->pia;
- pf->media_status = PF_NM;
- pf->drive = (*drives[unit])[D_SLV];
- pf->lun = (*drives[unit])[D_LUN];
- snprintf(pf->name, PF_NAMELEN, "%s%d", name, unit);
- disk->major = major;
- disk->first_minor = unit;
- strcpy(disk->disk_name, pf->name);
- disk->fops = &pf_fops;
- if (!(*drives[unit])[D_PRT])
- pf_drive_count++;
- }
- }
- static int pf_open(struct inode *inode, struct file *file)
- {
- struct pf_unit *pf = inode->i_bdev->bd_disk->private_data;
- pf_identify(pf);
- if (pf->media_status == PF_NM)
- return -ENODEV;
- if ((pf->media_status == PF_RO) && (file->f_mode & 2))
- return -EROFS;
- pf->access++;
- if (pf->removable)
- pf_lock(pf, 1);
- return 0;
- }
- static int pf_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
- {
- struct pf_unit *pf = inode->i_bdev->bd_disk->private_data;
- struct hd_geometry __user *geo = (struct hd_geometry __user *) arg;
- struct hd_geometry g;
- sector_t capacity;
- if (cmd == CDROMEJECT) {
- if (pf->access == 1) {
- pf_eject(pf);
- return 0;
- }
- return -EBUSY;
- }
- if (cmd != HDIO_GETGEO)
- return -EINVAL;
- capacity = get_capacity(pf->disk);
- if (capacity < PF_FD_MAX) {
- g.cylinders = sector_div(capacity, PF_FD_HDS * PF_FD_SPT);
- g.heads = PF_FD_HDS;
- g.sectors = PF_FD_SPT;
- } else {
- g.cylinders = sector_div(capacity, PF_HD_HDS * PF_HD_SPT);
- g.heads = PF_HD_HDS;
- g.sectors = PF_HD_SPT;
- }
- if (copy_to_user(geo, &g, sizeof(g)))
- return -EFAULT;
- return 0;
- }
- static int pf_release(struct inode *inode, struct file *file)
- {
- struct pf_unit *pf = inode->i_bdev->bd_disk->private_data;
- if (pf->access <= 0)
- return -EINVAL;
- pf->access--;
- if (!pf->access && pf->removable)
- pf_lock(pf, 0);
- return 0;
- }
- static int pf_check_media(struct gendisk *disk)
- {
- return 1;
- }
- static inline int status_reg(struct pf_unit *pf)
- {
- return pi_read_regr(pf->pi, 1, 6);
- }
- static inline int read_reg(struct pf_unit *pf, int reg)
- {
- return pi_read_regr(pf->pi, 0, reg);
- }
- static inline void write_reg(struct pf_unit *pf, int reg, int val)
- {
- pi_write_regr(pf->pi, 0, reg, val);
- }
- static int pf_wait(struct pf_unit *pf, int go, int stop, char *fun, char *msg)
- {
- int j, r, e, s, p;
- j = 0;
- while ((((r = status_reg(pf)) & go) || (stop && (!(r & stop))))
- && (j++ < PF_SPIN))
- udelay(PF_SPIN_DEL);
- if ((r & (STAT_ERR & stop)) || (j >= PF_SPIN)) {
- s = read_reg(pf, 7);
- e = read_reg(pf, 1);
- p = read_reg(pf, 2);
- if (j >= PF_SPIN)
- e |= 0x100;
- if (fun)
- printk("%s: %s %s: alt=0x%x stat=0x%x err=0x%x"
- " loop=%d phase=%dn",
- pf->name, fun, msg, r, s, e, j, p);
- return (e << 8) + s;
- }
- return 0;
- }
- static int pf_command(struct pf_unit *pf, char *cmd, int dlen, char *fun)
- {
- pi_connect(pf->pi);
- write_reg(pf, 6, 0xa0+0x10*pf->drive);
- if (pf_wait(pf, STAT_BUSY | STAT_DRQ, 0, fun, "before command")) {
- pi_disconnect(pf->pi);
- return -1;
- }
- write_reg(pf, 4, dlen % 256);
- write_reg(pf, 5, dlen / 256);
- write_reg(pf, 7, 0xa0); /* ATAPI packet command */
- if (pf_wait(pf, STAT_BUSY, STAT_DRQ, fun, "command DRQ")) {
- pi_disconnect(pf->pi);
- return -1;
- }
- if (read_reg(pf, 2) != 1) {
- printk("%s: %s: command phase errorn", pf->name, fun);
- pi_disconnect(pf->pi);
- return -1;
- }
- pi_write_block(pf->pi, cmd, 12);
- return 0;
- }
- static int pf_completion(struct pf_unit *pf, char *buf, char *fun)
- {
- int r, s, n;
- r = pf_wait(pf, STAT_BUSY, STAT_DRQ | STAT_READY | STAT_ERR,
- fun, "completion");
- if ((read_reg(pf, 2) & 2) && (read_reg(pf, 7) & STAT_DRQ)) {
- n = (((read_reg(pf, 4) + 256 * read_reg(pf, 5)) +
- 3) & 0xfffc);
- pi_read_block(pf->pi, buf, n);
- }
- s = pf_wait(pf, STAT_BUSY, STAT_READY | STAT_ERR, fun, "data done");
- pi_disconnect(pf->pi);
- return (r ? r : s);
- }
- static void pf_req_sense(struct pf_unit *pf, int quiet)
- {
- char rs_cmd[12] =
- { ATAPI_REQ_SENSE, pf->lun << 5, 0, 0, 16, 0, 0, 0, 0, 0, 0, 0 };
- char buf[16];
- int r;
- r = pf_command(pf, rs_cmd, 16, "Request sense");
- mdelay(1);
- if (!r)
- pf_completion(pf, buf, "Request sense");
- if ((!r) && (!quiet))
- printk("%s: Sense key: %x, ASC: %x, ASQ: %xn",
- pf->name, buf[2] & 0xf, buf[12], buf[13]);
- }
- static int pf_atapi(struct pf_unit *pf, char *cmd, int dlen, char *buf, char *fun)
- {
- int r;
- r = pf_command(pf, cmd, dlen, fun);
- mdelay(1);
- if (!r)
- r = pf_completion(pf, buf, fun);
- if (r)
- pf_req_sense(pf, !fun);
- return r;
- }
- #define DBMSG(msg) ((verbose>1)?(msg):NULL)
- static void pf_lock(struct pf_unit *pf, int func)
- {
- char lo_cmd[12] = { ATAPI_LOCK, pf->lun << 5, 0, 0, func, 0, 0, 0, 0, 0, 0, 0 };
- pf_atapi(pf, lo_cmd, 0, pf_scratch, func ? "unlock" : "lock");
- }
- static void pf_eject(struct pf_unit *pf)
- {
- char ej_cmd[12] = { ATAPI_DOOR, pf->lun << 5, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0 };
- pf_lock(pf, 0);
- pf_atapi(pf, ej_cmd, 0, pf_scratch, "eject");
- }
- #define PF_RESET_TMO 30 /* in tenths of a second */
- static void pf_sleep(int cs)
- {
- schedule_timeout_interruptible(cs);
- }
- /* the ATAPI standard actually specifies the contents of all 7 registers
- after a reset, but the specification is ambiguous concerning the last
- two bytes, and different drives interpret the standard differently.
- */
- static int pf_reset(struct pf_unit *pf)
- {
- int i, k, flg;
- int expect[5] = { 1, 1, 1, 0x14, 0xeb };
- pi_connect(pf->pi);
- write_reg(pf, 6, 0xa0+0x10*pf->drive);
- write_reg(pf, 7, 8);
- pf_sleep(20 * HZ / 1000);
- k = 0;
- while ((k++ < PF_RESET_TMO) && (status_reg(pf) & STAT_BUSY))
- pf_sleep(HZ / 10);
- flg = 1;
- for (i = 0; i < 5; i++)
- flg &= (read_reg(pf, i + 1) == expect[i]);
- if (verbose) {
- printk("%s: Reset (%d) signature = ", pf->name, k);
- for (i = 0; i < 5; i++)
- printk("%3x", read_reg(pf, i + 1));
- if (!flg)
- printk(" (incorrect)");
- printk("n");
- }
- pi_disconnect(pf->pi);
- return flg - 1;
- }
- static void pf_mode_sense(struct pf_unit *pf)
- {
- char ms_cmd[12] =
- { ATAPI_MODE_SENSE, pf->lun << 5, 0, 0, 0, 0, 0, 0, 8, 0, 0, 0 };
- char buf[8];
- pf_atapi(pf, ms_cmd, 8, buf, 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 %dn",
- 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 %dn",
- 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 median");
- else {
- if (pf->media_status == PF_RO)
- printk(", RO");
- printk(", %llu blocksn",
- (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 %dn",
- 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_probe(pf) && pf->disk) {
- pf->present = 1;
- k++;
- } else
- pi_release(pf->pi);
- }
- }
- if (k)
- return 0;
- printk("%s: No ATAPI disk detectedn", 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);
- if (pf_req) {
- pf_count = pf_req->current_nr_sectors;
- pf_buf = pf_req->buffer;
- }
- 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)