--- /dev/null
+/*
+ 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
+
+#include <linux/types.h>
+
+/* Here are things one can override from the insmod command.
+ Most are autoprobed by paride unless set here. Verbose is off
+ by default.
+
+*/
+
+static bool verbose = 0;
+static int major = PF_MAJOR;
+static char *name = PF_NAME;
+static int cluster = 64;
+static int nice = 0;
+static int disable = 0;
+
+static int drive0[7] = { 0, 0, 0, -1, -1, -1, -1 };
+static int drive1[7] = { 0, 0, 0, -1, -1, -1, -1 };
+static int drive2[7] = { 0, 0, 0, -1, -1, -1, -1 };
+static int drive3[7] = { 0, 0, 0, -1, -1, -1, -1 };
+
+static int (*drives[4])[7] = {&drive0, &drive1, &drive2, &drive3};
+static int pf_drive_count;
+
+enum {D_PRT, D_PRO, D_UNI, D_MOD, D_SLV, D_LUN, D_DLY};
+
+/* end of parameters */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/fs.h>
+#include <linux/delay.h>
+#include <linux/hdreg.h>
+#include <linux/cdrom.h>
+#include <linux/spinlock.h>
+#include <linux/blkdev.h>
+#include <linux/blkpg.h>
+#include <linux/mutex.h>
+#include <asm/uaccess.h>
+
+static DEFINE_MUTEX(pf_mutex);
+static DEFINE_SPINLOCK(pf_spin_lock);
+
+module_param(verbose, bool, 0644);
+module_param(major, int, 0);
+module_param(name, charp, 0);
+module_param(cluster, int, 0);
+module_param(nice, int, 0);
+module_param_array(drive0, int, NULL, 0);
+module_param_array(drive1, int, NULL, 0);
+module_param_array(drive2, int, NULL, 0);
+module_param_array(drive3, int, NULL, 0);
+
+#include "paride.h"
+#include "pseudo.h"
+
+/* constants for faking geometry numbers */
+
+#define PF_FD_MAX 8192 /* use FD geometry under this size */
+#define PF_FD_HDS 2
+#define PF_FD_SPT 18
+#define PF_HD_HDS 64
+#define PF_HD_SPT 32
+
+#define PF_MAX_RETRIES 5
+#define PF_TMO 800 /* interrupt timeout in jiffies */
+#define PF_SPIN_DEL 50 /* spin delay in micro-seconds */
+
+#define PF_SPIN (1000000*PF_TMO)/(HZ*PF_SPIN_DEL)
+
+#define STAT_ERR 0x00001
+#define STAT_INDEX 0x00002
+#define STAT_ECC 0x00004
+#define STAT_DRQ 0x00008
+#define STAT_SEEK 0x00010
+#define STAT_WRERR 0x00020
+#define STAT_READY 0x00040
+#define STAT_BUSY 0x00080
+
+#define ATAPI_REQ_SENSE 0x03
+#define ATAPI_LOCK 0x1e
+#define ATAPI_DOOR 0x1b
+#define ATAPI_MODE_SENSE 0x5a
+#define ATAPI_CAPACITY 0x25
+#define ATAPI_IDENTIFY 0x12
+#define ATAPI_READ_10 0x28
+#define ATAPI_WRITE_10 0x2a
+
+static int pf_open(struct block_device *bdev, fmode_t mode);
+static void do_pf_request(struct request_queue * q);
+static int pf_ioctl(struct block_device *bdev, fmode_t mode,
+ unsigned int cmd, unsigned long arg);
+static int pf_getgeo(struct block_device *bdev, struct hd_geometry *geo);
+
+static void pf_release(struct gendisk *disk, fmode_t mode);
+
+static int pf_detect(void);
+static void do_pf_read(void);
+static void do_pf_read_start(void);
+static void do_pf_write(void);
+static void do_pf_write_start(void);
+static void do_pf_read_drq(void);
+static void do_pf_write_done(void);
+
+#define PF_NM 0
+#define PF_RO 1
+#define PF_RW 2
+
+#define PF_NAMELEN 8
+
+struct pf_unit {
+ struct pi_adapter pia; /* interface to paride layer */
+ struct pi_adapter *pi;
+ int removable; /* removable media device ? */
+ int media_status; /* media present ? WP ? */
+ int drive; /* drive */
+ int lun;
+ int access; /* count of active opens ... */
+ int present; /* device present ? */
+ char name[PF_NAMELEN]; /* pf0, pf1, ... */
+ struct gendisk *disk;
+};
+
+static struct pf_unit units[PF_UNITS];
+
+static int pf_identify(struct pf_unit *pf);
+static void pf_lock(struct pf_unit *pf, int func);
+static void pf_eject(struct pf_unit *pf);
+static unsigned int pf_check_events(struct gendisk *disk,
+ unsigned int clearing);
+
+static char pf_scratch[512]; /* scratch block buffer */
+
+/* the variables below are used mainly in the I/O request engine, which
+ processes only one request at a time.
+*/
+
+static int pf_retries = 0; /* i/o error retry count */
+static int pf_busy = 0; /* request being processed ? */
+static struct request *pf_req; /* current request */
+static int pf_block; /* address of next requested block */
+static int pf_count; /* number of blocks still to do */
+static int pf_run; /* sectors in current cluster */
+static int pf_cmd; /* current command READ/WRITE */
+static struct pf_unit *pf_current;/* unit of current request */
+static int pf_mask; /* stopper for pseudo-int */
+static char *pf_buf; /* buffer for request in progress */
+
+/* kernel glue structures */
+
+static const struct block_device_operations pf_fops = {
+ .owner = THIS_MODULE,
+ .open = pf_open,
+ .release = pf_release,
+ .ioctl = pf_ioctl,
+ .getgeo = pf_getgeo,
+ .check_events = pf_check_events,
+};
+
+static void __init pf_init_units(void)
+{
+ struct pf_unit *pf;
+ int unit;
+
+ pf_drive_count = 0;
+ for (unit = 0, pf = units; unit < PF_UNITS; unit++, pf++) {
+ struct gendisk *disk = alloc_disk(1);
+ if (!disk)
+ continue;
+ pf->disk = disk;
+ pf->pi = &pf->pia;
+ pf->media_status = PF_NM;
+ pf->drive = (*drives[unit])[D_SLV];
+ pf->lun = (*drives[unit])[D_LUN];
+ snprintf(pf->name, PF_NAMELEN, "%s%d", name, unit);
+ disk->major = major;
+ disk->first_minor = unit;
+ strcpy(disk->disk_name, pf->name);
+ disk->fops = &pf_fops;
+ if (!(*drives[unit])[D_PRT])
+ pf_drive_count++;
+ }
+}
+
+static int pf_open(struct block_device *bdev, fmode_t mode)
+{
+ struct pf_unit *pf = bdev->bd_disk->private_data;
+ int ret;
+
+ mutex_lock(&pf_mutex);
+ pf_identify(pf);
+
+ ret = -ENODEV;
+ if (pf->media_status == PF_NM)
+ goto out;
+
+ ret = -EROFS;
+ if ((pf->media_status == PF_RO) && (mode & FMODE_WRITE))
+ goto out;
+
+ ret = 0;
+ pf->access++;
+ if (pf->removable)
+ pf_lock(pf, 1);
+out:
+ mutex_unlock(&pf_mutex);
+ return ret;
+}
+
+static int pf_getgeo(struct block_device *bdev, struct hd_geometry *geo)
+{
+ struct pf_unit *pf = bdev->bd_disk->private_data;
+ sector_t capacity = get_capacity(pf->disk);
+
+ if (capacity < PF_FD_MAX) {
+ geo->cylinders = sector_div(capacity, PF_FD_HDS * PF_FD_SPT);
+ geo->heads = PF_FD_HDS;
+ geo->sectors = PF_FD_SPT;
+ } else {
+ geo->cylinders = sector_div(capacity, PF_HD_HDS * PF_HD_SPT);
+ geo->heads = PF_HD_HDS;
+ geo->sectors = PF_HD_SPT;
+ }
+
+ return 0;
+}
+
+static int pf_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg)
+{
+ struct pf_unit *pf = bdev->bd_disk->private_data;
+
+ if (cmd != CDROMEJECT)
+ return -EINVAL;
+
+ if (pf->access != 1)
+ return -EBUSY;
+ mutex_lock(&pf_mutex);
+ pf_eject(pf);
+ mutex_unlock(&pf_mutex);
+
+ return 0;
+}
+
+static void pf_release(struct gendisk *disk, fmode_t mode)
+{
+ struct pf_unit *pf = disk->private_data;
+
+ mutex_lock(&pf_mutex);
+ if (pf->access <= 0) {
+ mutex_unlock(&pf_mutex);
+ WARN_ON(1);
+ return;
+ }
+
+ pf->access--;
+
+ if (!pf->access && pf->removable)
+ pf_lock(pf, 0);
+
+ mutex_unlock(&pf_mutex);
+}
+
+static unsigned int pf_check_events(struct gendisk *disk, unsigned int clearing)
+{
+ return DISK_EVENT_MEDIA_CHANGE;
+}
+
+static inline int status_reg(struct pf_unit *pf)
+{
+ return pi_read_regr(pf->pi, 1, 6);
+}
+
+static inline int read_reg(struct pf_unit *pf, int reg)
+{
+ return pi_read_regr(pf->pi, 0, reg);
+}
+
+static inline void write_reg(struct pf_unit *pf, int reg, int val)
+{
+ pi_write_regr(pf->pi, 0, reg, val);
+}
+
+static int pf_wait(struct pf_unit *pf, int go, int stop, char *fun, char *msg)
+{
+ int j, r, e, s, p;
+
+ j = 0;
+ while ((((r = status_reg(pf)) & go) || (stop && (!(r & stop))))
+ && (j++ < PF_SPIN))
+ udelay(PF_SPIN_DEL);
+
+ if ((r & (STAT_ERR & stop)) || (j > PF_SPIN)) {
+ s = read_reg(pf, 7);
+ e = read_reg(pf, 1);
+ p = read_reg(pf, 2);
+ if (j > PF_SPIN)
+ e |= 0x100;
+ if (fun)
+ printk("%s: %s %s: alt=0x%x stat=0x%x err=0x%x"
+ " loop=%d phase=%d\n",
+ pf->name, fun, msg, r, s, e, j, p);
+ return (e << 8) + s;
+ }
+ return 0;
+}
+
+static int pf_command(struct pf_unit *pf, char *cmd, int dlen, char *fun)
+{
+ pi_connect(pf->pi);
+
+ write_reg(pf, 6, 0xa0+0x10*pf->drive);
+
+ if (pf_wait(pf, STAT_BUSY | STAT_DRQ, 0, fun, "before command")) {
+ pi_disconnect(pf->pi);
+ return -1;
+ }
+
+ write_reg(pf, 4, dlen % 256);
+ write_reg(pf, 5, dlen / 256);
+ write_reg(pf, 7, 0xa0); /* ATAPI packet command */
+
+ if (pf_wait(pf, STAT_BUSY, STAT_DRQ, fun, "command DRQ")) {
+ pi_disconnect(pf->pi);
+ return -1;
+ }
+
+ if (read_reg(pf, 2) != 1) {
+ printk("%s: %s: command phase error\n", pf->name, fun);
+ pi_disconnect(pf->pi);
+ return -1;
+ }
+
+ pi_write_block(pf->pi, cmd, 12);
+
+ return 0;
+}
+
+static int pf_completion(struct pf_unit *pf, char *buf, char *fun)
+{
+ int r, s, n;
+
+ r = pf_wait(pf, STAT_BUSY, STAT_DRQ | STAT_READY | STAT_ERR,
+ fun, "completion");
+
+ if ((read_reg(pf, 2) & 2) && (read_reg(pf, 7) & STAT_DRQ)) {
+ n = (((read_reg(pf, 4) + 256 * read_reg(pf, 5)) +
+ 3) & 0xfffc);
+ pi_read_block(pf->pi, buf, n);
+ }
+
+ s = pf_wait(pf, STAT_BUSY, STAT_READY | STAT_ERR, fun, "data done");
+
+ pi_disconnect(pf->pi);
+
+ return (r ? r : s);
+}
+
+static void pf_req_sense(struct pf_unit *pf, int quiet)
+{
+ char rs_cmd[12] =
+ { ATAPI_REQ_SENSE, pf->lun << 5, 0, 0, 16, 0, 0, 0, 0, 0, 0, 0 };
+ char buf[16];
+ int r;
+
+ r = pf_command(pf, rs_cmd, 16, "Request sense");
+ mdelay(1);
+ if (!r)
+ pf_completion(pf, buf, "Request sense");
+
+ if ((!r) && (!quiet))
+ printk("%s: Sense key: %x, ASC: %x, ASQ: %x\n",
+ pf->name, buf[2] & 0xf, buf[12], buf[13]);
+}
+
+static int pf_atapi(struct pf_unit *pf, char *cmd, int dlen, char *buf, char *fun)
+{
+ int r;
+
+ r = pf_command(pf, cmd, dlen, fun);
+ mdelay(1);
+ if (!r)
+ r = pf_completion(pf, buf, fun);
+ if (r)
+ pf_req_sense(pf, !fun);
+
+ return r;
+}
+
+static void pf_lock(struct pf_unit *pf, int func)
+{
+ char lo_cmd[12] = { ATAPI_LOCK, pf->lun << 5, 0, 0, func, 0, 0, 0, 0, 0, 0, 0 };
+
+ pf_atapi(pf, lo_cmd, 0, pf_scratch, func ? "lock" : "unlock");
+}
+
+static void pf_eject(struct pf_unit *pf)
+{
+ char ej_cmd[12] = { ATAPI_DOOR, pf->lun << 5, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0 };
+
+ pf_lock(pf, 0);
+ pf_atapi(pf, ej_cmd, 0, pf_scratch, "eject");
+}
+
+#define PF_RESET_TMO 30 /* in tenths of a second */
+
+static void pf_sleep(int cs)
+{
+ schedule_timeout_interruptible(cs);
+}
+
+/* the ATAPI standard actually specifies the contents of all 7 registers
+ after a reset, but the specification is ambiguous concerning the last
+ two bytes, and different drives interpret the standard differently.
+ */
+
+static int pf_reset(struct pf_unit *pf)
+{
+ int i, k, flg;
+ int expect[5] = { 1, 1, 1, 0x14, 0xeb };
+
+ pi_connect(pf->pi);
+ write_reg(pf, 6, 0xa0+0x10*pf->drive);
+ write_reg(pf, 7, 8);
+
+ pf_sleep(20 * HZ / 1000);
+
+ k = 0;
+ while ((k++ < PF_RESET_TMO) && (status_reg(pf) & STAT_BUSY))
+ pf_sleep(HZ / 10);
+
+ flg = 1;
+ for (i = 0; i < 5; i++)
+ flg &= (read_reg(pf, i + 1) == expect[i]);
+
+ if (verbose) {
+ printk("%s: Reset (%d) signature = ", pf->name, k);
+ for (i = 0; i < 5; i++)
+ printk("%3x", read_reg(pf, i + 1));
+ if (!flg)
+ printk(" (incorrect)");
+ printk("\n");
+ }
+
+ pi_disconnect(pf->pi);
+ return flg - 1;
+}
+
+static void pf_mode_sense(struct pf_unit *pf)
+{
+ char ms_cmd[12] =
+ { ATAPI_MODE_SENSE, pf->lun << 5, 0, 0, 0, 0, 0, 0, 8, 0, 0, 0 };
+ char buf[8];
+
+ pf_atapi(pf, ms_cmd, 8, buf, "mode sense");
+ pf->media_status = PF_RW;
+ if (buf[3] & 0x80)
+ pf->media_status = PF_RO;
+}
+
+static void xs(char *buf, char *targ, int offs, int len)
+{
+ int j, k, l;
+
+ j = 0;
+ l = 0;
+ for (k = 0; k < len; k++)
+ if ((buf[k + offs] != 0x20) || (buf[k + offs] != l))
+ l = targ[j++] = buf[k + offs];
+ if (l == 0x20)
+ j--;
+ targ[j] = 0;
+}
+
+static int xl(char *buf, int offs)
+{
+ int v, k;
+
+ v = 0;
+ for (k = 0; k < 4; k++)
+ v = v * 256 + (buf[k + offs] & 0xff);
+ return v;
+}
+
+static void pf_get_capacity(struct pf_unit *pf)
+{
+ char rc_cmd[12] = { ATAPI_CAPACITY, pf->lun << 5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
+ char buf[8];
+ int bs;
+
+ if (pf_atapi(pf, rc_cmd, 8, buf, "get capacity")) {
+ pf->media_status = PF_NM;
+ return;
+ }
+ set_capacity(pf->disk, xl(buf, 0) + 1);
+ bs = xl(buf, 4);
+ if (bs != 512) {
+ set_capacity(pf->disk, 0);
+ if (verbose)
+ printk("%s: Drive %d, LUN %d,"
+ " unsupported block size %d\n",
+ pf->name, pf->drive, pf->lun, bs);
+ }
+}
+
+static int pf_identify(struct pf_unit *pf)
+{
+ int dt, s;
+ char *ms[2] = { "master", "slave" };
+ char mf[10], id[18];
+ char id_cmd[12] =
+ { ATAPI_IDENTIFY, pf->lun << 5, 0, 0, 36, 0, 0, 0, 0, 0, 0, 0 };
+ char buf[36];
+
+ s = pf_atapi(pf, id_cmd, 36, buf, "identify");
+ if (s)
+ return -1;
+
+ dt = buf[0] & 0x1f;
+ if ((dt != 0) && (dt != 7)) {
+ if (verbose)
+ printk("%s: Drive %d, LUN %d, unsupported type %d\n",
+ pf->name, pf->drive, pf->lun, dt);
+ return -1;
+ }
+
+ xs(buf, mf, 8, 8);
+ xs(buf, id, 16, 16);
+
+ pf->removable = (buf[1] & 0x80);
+
+ pf_mode_sense(pf);
+ pf_mode_sense(pf);
+ pf_mode_sense(pf);
+
+ pf_get_capacity(pf);
+
+ printk("%s: %s %s, %s LUN %d, type %d",
+ pf->name, mf, id, ms[pf->drive], pf->lun, dt);
+ if (pf->removable)
+ printk(", removable");
+ if (pf->media_status == PF_NM)
+ printk(", no media\n");
+ else {
+ if (pf->media_status == PF_RO)
+ printk(", RO");
+ printk(", %llu blocks\n",
+ (unsigned long long)get_capacity(pf->disk));
+ }
+ return 0;
+}
+
+/* returns 0, with id set if drive is detected
+ -1, if drive detection failed
+*/
+static int pf_probe(struct pf_unit *pf)
+{
+ if (pf->drive == -1) {
+ for (pf->drive = 0; pf->drive <= 1; pf->drive++)
+ if (!pf_reset(pf)) {
+ if (pf->lun != -1)
+ return pf_identify(pf);
+ else
+ for (pf->lun = 0; pf->lun < 8; pf->lun++)
+ if (!pf_identify(pf))
+ return 0;
+ }
+ } else {
+ if (pf_reset(pf))
+ return -1;
+ if (pf->lun != -1)
+ return pf_identify(pf);
+ for (pf->lun = 0; pf->lun < 8; pf->lun++)
+ if (!pf_identify(pf))
+ return 0;
+ }
+ return -1;
+}
+
+static int pf_detect(void)
+{
+ struct pf_unit *pf = units;
+ int k, unit;
+
+ printk("%s: %s version %s, major %d, cluster %d, nice %d\n",
+ name, name, PF_VERSION, major, cluster, nice);
+
+ 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 err)
+{
+ if (pf_req && !__blk_end_request_cur(pf_req, err))
+ pf_req = NULL;
+}
+
+static void do_pf_request(struct request_queue * q)
+{
+ if (pf_busy)
+ return;
+repeat:
+ if (!pf_req) {
+ pf_req = blk_fetch_request(q);
+ if (!pf_req)
+ return;
+ }
+
+ pf_current = pf_req->rq_disk->private_data;
+ pf_block = blk_rq_pos(pf_req);
+ pf_run = blk_rq_sectors(pf_req);
+ pf_count = blk_rq_cur_sectors(pf_req);
+
+ if (pf_block + pf_count > get_capacity(pf_req->rq_disk)) {
+ pf_end_request(-EIO);
+ goto repeat;
+ }
+
+ pf_cmd = rq_data_dir(pf_req);
+ pf_buf = bio_data(pf_req->bio);
+ pf_retries = 0;
+
+ pf_busy = 1;
+ if (pf_cmd == READ)
+ pi_do_claimed(pf_current->pi, do_pf_read);
+ else if (pf_cmd == WRITE)
+ pi_do_claimed(pf_current->pi, do_pf_write);
+ else {
+ pf_busy = 0;
+ pf_end_request(-EIO);
+ 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 1;
+ if (!pf_count) {
+ spin_lock_irqsave(&pf_spin_lock, saved_flags);
+ pf_end_request(0);
+ spin_unlock_irqrestore(&pf_spin_lock, saved_flags);
+ if (!pf_req)
+ return 1;
+ pf_count = blk_rq_cur_sectors(pf_req);
+ pf_buf = bio_data(pf_req->bio);
+ }
+ return 0;
+}
+
+static inline void next_request(int err)
+{
+ unsigned long saved_flags;
+
+ spin_lock_irqsave(&pf_spin_lock, saved_flags);
+ pf_end_request(err);
+ 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(-EIO);
+ 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(-EIO);
+ return;
+ }
+ pi_read_block(pf_current->pi, pf_buf, 512);
+ if (pf_next_buf())
+ break;
+ }
+ pi_disconnect(pf_current->pi);
+ next_request(0);
+}
+
+static void do_pf_write(void)
+{
+ ps_set_intr(do_pf_write_start, NULL, 0, nice);
+}
+
+static void do_pf_write_start(void)
+{
+ pf_busy = 1;
+
+ if (pf_start(pf_current, ATAPI_WRITE_10, pf_block, pf_run)) {
+ pi_disconnect(pf_current->pi);
+ if (pf_retries < PF_MAX_RETRIES) {
+ pf_retries++;
+ pi_do_claimed(pf_current->pi, do_pf_write_start);
+ return;
+ }
+ next_request(-EIO);
+ 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(-EIO);
+ 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(-EIO);
+ return;
+ }
+ pi_disconnect(pf_current->pi);
+ next_request(0);
+}
+
+static int __init pf_init(void)
+{ /* preliminary initialisation */
+ struct pf_unit *pf;
+ int unit;
+
+ if (disable)
+ return -EINVAL;
+
+ pf_init_units();
+
+ if (pf_detect())
+ return -ENODEV;
+ pf_busy = 0;
+
+ if (register_blkdev(major, name)) {
+ for (pf = units, unit = 0; unit < PF_UNITS; pf++, unit++)
+ put_disk(pf->disk);
+ return -EBUSY;
+ }
+ 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 -ENOMEM;
+ }
+
+ blk_queue_max_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)
Code Review / kvmfornfv.git / blobdiff