drivers/block: Remove PARIDE core and high-level protocols

Remove PARIDE core and high level protocols, taking care not to break
low-level drivers (used by pata_parport). Also update documentation.

Signed-off-by: Ondrej Zary <linux@zary.sk>
Acked-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>

1 files changed, 0 insertions, 1057 deletions

diff --git a/drivers/block/paride/pf.c b/drivers/block/paride/pf.c
deleted file mode 100644
index eec1b9fde245..000000000000
--- a/drivers/block/paride/pf.c
+++ /dev/null
@@ -1,1057 +0,0 @@
-/* 
-        pf.c    (c) 1997-8  Grant R. Guenther <grant@torque.net>
-                            Under the terms of the GNU General Public License.
-
-        This is the high-level driver for parallel port ATAPI disk
-        drives based on chips supported by the paride module.
-
-        By default, the driver will autoprobe for a single parallel
-        port ATAPI disk drive, but if their individual parameters are
-        specified, the driver can handle up to 4 drives.
-
-        The behaviour of the pf driver can be altered by setting
-        some parameters from the insmod command line.  The following
-        parameters are adjustable:
-
-            drive0      These four arguments can be arrays of       
-            drive1      1-7 integers as follows:
-            drive2
-            drive3      <prt>,<pro>,<uni>,<mod>,<slv>,<lun>,<dly>
-
-                        Where,
-
-                <prt>   is the base of the parallel port address for
-                        the corresponding drive.  (required)
-
-                <pro>   is the protocol number for the adapter that
-                        supports this drive.  These numbers are
-                        logged by 'paride' when the protocol modules
-                        are initialised.  (0 if not given)
-
-                <uni>   for those adapters that support chained
-                        devices, this is the unit selector for the
-                        chain of devices on the given port.  It should
-                        be zero for devices that don't support chaining.
-                        (0 if not given)
-
-                <mod>   this can be -1 to choose the best mode, or one
-                        of the mode numbers supported by the adapter.
-                        (-1 if not given)
-
-                <slv>   ATAPI CDroms can be jumpered to master or slave.
-                        Set this to 0 to choose the master drive, 1 to
-                        choose the slave, -1 (the default) to choose the
-                        first drive found.
-
-		<lun>   Some ATAPI devices support multiple LUNs.
-                        One example is the ATAPI PD/CD drive from
-                        Matshita/Panasonic.  This device has a 
-                        CD drive on LUN 0 and a PD drive on LUN 1.
-                        By default, the driver will search for the
-                        first LUN with a supported device.  Set 
-                        this parameter to force it to use a specific
-                        LUN.  (default -1)
-
-                <dly>   some parallel ports require the driver to 
-                        go more slowly.  -1 sets a default value that
-                        should work with the chosen protocol.  Otherwise,
-                        set this to a small integer, the larger it is
-                        the slower the port i/o.  In some cases, setting
-                        this to zero will speed up the device. (default -1)
-
-	    major	You may use this parameter to override the
-			default major number (47) that this driver
-			will use.  Be sure to change the device
-			name as well.
-
-	    name	This parameter is a character string that
-			contains the name the kernel will use for this
-			device (in /proc output, for instance).
-			(default "pf").
-
-            cluster     The driver will attempt to aggregate requests
-                        for adjacent blocks into larger multi-block
-                        clusters.  The maximum cluster size (in 512
-                        byte sectors) is set with this parameter.
-                        (default 64)
-
-            verbose     This parameter controls the amount of logging
-                        that the driver will do.  Set it to 0 for
-                        normal operation, 1 to see autoprobe progress
-                        messages, or 2 to see additional debugging
-                        output.  (default 0)
- 
-	    nice        This parameter controls the driver's use of
-			idle CPU time, at the expense of some speed.
-
-        If this driver is built into the kernel, you can use the
-        following command line parameters, with the same values
-        as the corresponding module parameters listed above:
-
-            pf.drive0
-            pf.drive1
-            pf.drive2
-            pf.drive3
-	    pf.cluster
-            pf.nice
-
-        In addition, you can use the parameter pf.disable to disable
-        the driver entirely.
-
-*/
-
-/* Changes:
-
-	1.01	GRG 1998.05.03  Changes for SMP.  Eliminate sti().
-				Fix for drives that don't clear STAT_ERR
-			        until after next CDB delivered.
-				Small change in pf_completion to round
-				up transfer size.
-	1.02    GRG 1998.06.16  Eliminated an Ugh
-	1.03    GRG 1998.08.16  Use HZ in loop timings, extra debugging
-	1.04    GRG 1998.09.24  Added jumbo support
-
-*/
-
-#define PF_VERSION      "1.04"
-#define PF_MAJOR	47
-#define PF_NAME		"pf"
-#define PF_UNITS	4
-
-#include <linux/types.h>
-
-/* Here are things one can override from the insmod command.
-   Most are autoprobed by paride unless set here.  Verbose is off
-   by default.
-
-*/
-
-static bool verbose = 0;
-static int major = PF_MAJOR;
-static char *name = PF_NAME;
-static int cluster = 64;
-static int nice = 0;
-static int disable = 0;
-
-static int drive0[7] = { 0, 0, 0, -1, -1, -1, -1 };
-static int drive1[7] = { 0, 0, 0, -1, -1, -1, -1 };
-static int drive2[7] = { 0, 0, 0, -1, -1, -1, -1 };
-static int drive3[7] = { 0, 0, 0, -1, -1, -1, -1 };
-
-static int (*drives[4])[7] = {&drive0, &drive1, &drive2, &drive3};
-static int pf_drive_count;
-
-enum {D_PRT, D_PRO, D_UNI, D_MOD, D_SLV, D_LUN, D_DLY};
-
-/* end of parameters */
-
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/fs.h>
-#include <linux/delay.h>
-#include <linux/hdreg.h>
-#include <linux/cdrom.h>
-#include <linux/spinlock.h>
-#include <linux/blk-mq.h>
-#include <linux/blkpg.h>
-#include <linux/mutex.h>
-#include <linux/uaccess.h>
-
-static DEFINE_MUTEX(pf_mutex);
-static DEFINE_SPINLOCK(pf_spin_lock);
-
-module_param(verbose, bool, 0644);
-module_param(major, int, 0);
-module_param(name, charp, 0);
-module_param(cluster, int, 0);
-module_param(nice, int, 0);
-module_param_array(drive0, int, NULL, 0);
-module_param_array(drive1, int, NULL, 0);
-module_param_array(drive2, int, NULL, 0);
-module_param_array(drive3, int, NULL, 0);
-
-#include "paride.h"
-#include "pseudo.h"
-
-/* constants for faking geometry numbers */
-
-#define PF_FD_MAX	8192	/* use FD geometry under this size */
-#define PF_FD_HDS	2
-#define PF_FD_SPT	18
-#define PF_HD_HDS	64
-#define PF_HD_SPT	32
-
-#define PF_MAX_RETRIES  5
-#define PF_TMO          800	/* interrupt timeout in jiffies */
-#define PF_SPIN_DEL     50	/* spin delay in micro-seconds  */
-
-#define PF_SPIN         (1000000*PF_TMO)/(HZ*PF_SPIN_DEL)
-
-#define STAT_ERR        0x00001
-#define STAT_INDEX      0x00002
-#define STAT_ECC        0x00004
-#define STAT_DRQ        0x00008
-#define STAT_SEEK       0x00010
-#define STAT_WRERR      0x00020
-#define STAT_READY      0x00040
-#define STAT_BUSY       0x00080
-
-#define ATAPI_REQ_SENSE		0x03
-#define ATAPI_LOCK		0x1e
-#define ATAPI_DOOR		0x1b
-#define ATAPI_MODE_SENSE	0x5a
-#define ATAPI_CAPACITY		0x25
-#define ATAPI_IDENTIFY		0x12
-#define ATAPI_READ_10		0x28
-#define ATAPI_WRITE_10		0x2a
-
-static int pf_open(struct block_device *bdev, fmode_t mode);
-static blk_status_t pf_queue_rq(struct blk_mq_hw_ctx *hctx,
-				const struct blk_mq_queue_data *bd);
-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 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;
-	struct blk_mq_tag_set tag_set;
-	struct list_head rq_list;
-};
-
-static struct pf_unit units[PF_UNITS];
-
-static int pf_identify(struct pf_unit *pf);
-static void pf_lock(struct pf_unit *pf, int func);
-static void pf_eject(struct pf_unit *pf);
-static unsigned int pf_check_events(struct gendisk *disk,
-				    unsigned int clearing);
-
-static char pf_scratch[512];	/* scratch block buffer */
-
-/* the variables below are used mainly in the I/O request engine, which
-   processes only one request at a time.
-*/
-
-static int pf_retries = 0;	/* i/o error retry count */
-static int pf_busy = 0;		/* request being processed ? */
-static struct request *pf_req;	/* current request */
-static int pf_block;		/* address of next requested block */
-static int pf_count;		/* number of blocks still to do */
-static int pf_run;		/* sectors in current cluster */
-static int pf_cmd;		/* current command READ/WRITE */
-static struct pf_unit *pf_current;/* unit of current request */
-static int pf_mask;		/* stopper for pseudo-int */
-static char *pf_buf;		/* buffer for request in progress */
-static void *par_drv;		/* reference of parport driver */
-
-/* kernel glue structures */
-
-static const struct block_device_operations pf_fops = {
-	.owner		= THIS_MODULE,
-	.open		= pf_open,
-	.release	= pf_release,
-	.ioctl		= pf_ioctl,
-	.compat_ioctl	= pf_ioctl,
-	.getgeo		= pf_getgeo,
-	.check_events	= pf_check_events,
-};
-
-static const struct blk_mq_ops pf_mq_ops = {
-	.queue_rq	= pf_queue_rq,
-};
-
-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, otherwise an error code.
- */
-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 -ENODEV;
-}
-
-/* The i/o request engine */
-
-static int pf_start(struct pf_unit *pf, int cmd, int b, int c)
-{
-	int i;
-	char io_cmd[12] = { cmd, pf->lun << 5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
-
-	for (i = 0; i < 4; i++) {
-		io_cmd[5 - i] = b & 0xff;
-		b = b >> 8;
-	}
-
-	io_cmd[8] = c & 0xff;
-	io_cmd[7] = (c >> 8) & 0xff;
-
-	i = pf_command(pf, io_cmd, c * 512, "start i/o");
-
-	mdelay(1);
-
-	return i;
-}
-
-static int pf_ready(void)
-{
-	return (((status_reg(pf_current) & (STAT_BUSY | pf_mask)) == pf_mask));
-}
-
-static int pf_queue;
-
-static int set_next_request(void)
-{
-	struct pf_unit *pf;
-	int old_pos = pf_queue;
-
-	do {
-		pf = &units[pf_queue];
-		if (++pf_queue == PF_UNITS)
-			pf_queue = 0;
-		if (pf->present && !list_empty(&pf->rq_list)) {
-			pf_req = list_first_entry(&pf->rq_list, struct request,
-							queuelist);
-			list_del_init(&pf_req->queuelist);
-			blk_mq_start_request(pf_req);
-			break;
-		}
-	} while (pf_queue != old_pos);
-
-	return pf_req != NULL;
-}
-
-static void pf_end_request(blk_status_t err)
-{
-	if (!pf_req)
-		return;
-	if (!blk_update_request(pf_req, err, blk_rq_cur_bytes(pf_req))) {
-		__blk_mq_end_request(pf_req, err);
-		pf_req = NULL;
-	}
-}
-
-static void pf_request(void)
-{
-	if (pf_busy)
-		return;
-repeat:
-	if (!pf_req && !set_next_request())
-		return;
-
-	pf_current = pf_req->q->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->q->disk)) {
-		pf_end_request(BLK_STS_IOERR);
-		goto repeat;
-	}
-
-	pf_cmd = rq_data_dir(pf_req);
-	pf_buf = bio_data(pf_req->bio);
-	pf_retries = 0;
-
-	pf_busy = 1;
-	if (pf_cmd == READ)
-		pi_do_claimed(pf_current->pi, do_pf_read);
-	else if (pf_cmd == WRITE)
-		pi_do_claimed(pf_current->pi, do_pf_write);
-	else {
-		pf_busy = 0;
-		pf_end_request(BLK_STS_IOERR);
-		goto repeat;
-	}
-}
-
-static blk_status_t pf_queue_rq(struct blk_mq_hw_ctx *hctx,
-				const struct blk_mq_queue_data *bd)
-{
-	struct pf_unit *pf = hctx->queue->queuedata;
-
-	spin_lock_irq(&pf_spin_lock);
-	list_add_tail(&bd->rq->queuelist, &pf->rq_list);
-	pf_request();
-	spin_unlock_irq(&pf_spin_lock);
-
-	return BLK_STS_OK;
-}
-
-static int pf_next_buf(void)
-{
-	unsigned long saved_flags;
-
-	pf_count--;
-	pf_run--;
-	pf_buf += 512;
-	pf_block++;
-	if (!pf_run)
-		return 1;
-	if (!pf_count) {
-		spin_lock_irqsave(&pf_spin_lock, saved_flags);
-		pf_end_request(0);
-		spin_unlock_irqrestore(&pf_spin_lock, saved_flags);
-		if (!pf_req)
-			return 1;
-		pf_count = blk_rq_cur_sectors(pf_req);
-		pf_buf = bio_data(pf_req->bio);
-	}
-	return 0;
-}
-
-static inline void next_request(blk_status_t err)
-{
-	unsigned long saved_flags;
-
-	spin_lock_irqsave(&pf_spin_lock, saved_flags);
-	pf_end_request(err);
-	pf_busy = 0;
-	pf_request();
-	spin_unlock_irqrestore(&pf_spin_lock, saved_flags);
-}
-
-/* detach from the calling context - in case the spinlock is held */
-static void do_pf_read(void)
-{
-	ps_set_intr(do_pf_read_start, NULL, 0, nice);
-}
-
-static void do_pf_read_start(void)
-{
-	pf_busy = 1;
-
-	if (pf_start(pf_current, ATAPI_READ_10, pf_block, pf_run)) {
-		pi_disconnect(pf_current->pi);
-		if (pf_retries < PF_MAX_RETRIES) {
-			pf_retries++;
-			pi_do_claimed(pf_current->pi, do_pf_read_start);
-			return;
-		}
-		next_request(BLK_STS_IOERR);
-		return;
-	}
-	pf_mask = STAT_DRQ;
-	ps_set_intr(do_pf_read_drq, pf_ready, PF_TMO, nice);
-}
-
-static void do_pf_read_drq(void)
-{
-	while (1) {
-		if (pf_wait(pf_current, STAT_BUSY, STAT_DRQ | STAT_ERR,
-			    "read block", "completion") & STAT_ERR) {
-			pi_disconnect(pf_current->pi);
-			if (pf_retries < PF_MAX_RETRIES) {
-				pf_req_sense(pf_current, 0);
-				pf_retries++;
-				pi_do_claimed(pf_current->pi, do_pf_read_start);
-				return;
-			}
-			next_request(BLK_STS_IOERR);
-			return;
-		}
-		pi_read_block(pf_current->pi, pf_buf, 512);
-		if (pf_next_buf())
-			break;
-	}
-	pi_disconnect(pf_current->pi);
-	next_request(0);
-}
-
-static void do_pf_write(void)
-{
-	ps_set_intr(do_pf_write_start, NULL, 0, nice);
-}
-
-static void do_pf_write_start(void)
-{
-	pf_busy = 1;
-
-	if (pf_start(pf_current, ATAPI_WRITE_10, pf_block, pf_run)) {
-		pi_disconnect(pf_current->pi);
-		if (pf_retries < PF_MAX_RETRIES) {
-			pf_retries++;
-			pi_do_claimed(pf_current->pi, do_pf_write_start);
-			return;
-		}
-		next_request(BLK_STS_IOERR);
-		return;
-	}
-
-	while (1) {
-		if (pf_wait(pf_current, STAT_BUSY, STAT_DRQ | STAT_ERR,
-			    "write block", "data wait") & STAT_ERR) {
-			pi_disconnect(pf_current->pi);
-			if (pf_retries < PF_MAX_RETRIES) {
-				pf_retries++;
-				pi_do_claimed(pf_current->pi, do_pf_write_start);
-				return;
-			}
-			next_request(BLK_STS_IOERR);
-			return;
-		}
-		pi_write_block(pf_current->pi, pf_buf, 512);
-		if (pf_next_buf())
-			break;
-	}
-	pf_mask = 0;
-	ps_set_intr(do_pf_write_done, pf_ready, PF_TMO, nice);
-}
-
-static void do_pf_write_done(void)
-{
-	if (pf_wait(pf_current, STAT_BUSY, 0, "write block", "done") & STAT_ERR) {
-		pi_disconnect(pf_current->pi);
-		if (pf_retries < PF_MAX_RETRIES) {
-			pf_retries++;
-			pi_do_claimed(pf_current->pi, do_pf_write_start);
-			return;
-		}
-		next_request(BLK_STS_IOERR);
-		return;
-	}
-	pi_disconnect(pf_current->pi);
-	next_request(0);
-}
-
-static int __init pf_init_unit(struct pf_unit *pf, bool autoprobe, int port,
-		int mode, int unit, int protocol, int delay, int ms)
-{
-	struct gendisk *disk;
-	int ret;
-
-	ret = blk_mq_alloc_sq_tag_set(&pf->tag_set, &pf_mq_ops, 1,
-				      BLK_MQ_F_SHOULD_MERGE);
-	if (ret)
-		return ret;
-
-	disk = blk_mq_alloc_disk(&pf->tag_set, pf);
-	if (IS_ERR(disk)) {
-		ret = PTR_ERR(disk);
-		goto out_free_tag_set;
-	}
-	disk->major = major;
-	disk->first_minor = pf - units;
-	disk->minors = 1;
-	strcpy(disk->disk_name, pf->name);
-	disk->fops = &pf_fops;
-	disk->flags |= GENHD_FL_NO_PART;
-	disk->events = DISK_EVENT_MEDIA_CHANGE;
-	disk->private_data = pf;
-
-	blk_queue_max_segments(disk->queue, cluster);
-	blk_queue_bounce_limit(disk->queue, BLK_BOUNCE_HIGH);
-
-	INIT_LIST_HEAD(&pf->rq_list);
-	pf->disk = disk;
-	pf->pi = &pf->pia;
-	pf->media_status = PF_NM;
-	pf->drive = (*drives[disk->first_minor])[D_SLV];
-	pf->lun = (*drives[disk->first_minor])[D_LUN];
-	snprintf(pf->name, PF_NAMELEN, "%s%d", name, disk->first_minor);
-
-	if (!pi_init(pf->pi, autoprobe, port, mode, unit, protocol, delay,
-			pf_scratch, PI_PF, verbose, pf->name)) {
-		ret = -ENODEV;
-		goto out_free_disk;
-	}
-	ret = pf_probe(pf);
-	if (ret)
-		goto out_pi_release;
-
-	ret = add_disk(disk);
-	if (ret)
-		goto out_pi_release;
-	pf->present = 1;
-	return 0;
-
-out_pi_release:
-	pi_release(pf->pi);
-out_free_disk:
-	put_disk(pf->disk);
-out_free_tag_set:
-	blk_mq_free_tag_set(&pf->tag_set);
-	return ret;
-}
-
-static int __init pf_init(void)
-{				/* preliminary initialisation */
-	struct pf_unit *pf;
-	int found = 0, unit;
-
-	if (disable)
-		return -EINVAL;
-
-	if (register_blkdev(major, name))
-		return -EBUSY;
-
-	printk("%s: %s version %s, major %d, cluster %d, nice %d\n",
-	       name, name, PF_VERSION, major, cluster, nice);
-
-	par_drv = pi_register_driver(name);
-	if (!par_drv) {
-		pr_err("failed to register %s driver\n", name);
-		goto out_unregister_blkdev;
-	}
-
-	for (unit = 0; unit < PF_UNITS; unit++) {
-		if (!(*drives[unit])[D_PRT])
-			pf_drive_count++;
-	}
-
-	pf = units;
-	if (pf_drive_count == 0) {
-		if (pf_init_unit(pf, 1, -1, -1, -1, -1, -1, verbose))
-			found++;
-	} else {
-		for (unit = 0; unit < PF_UNITS; unit++, pf++) {
-			int *conf = *drives[unit];
-			if (!conf[D_PRT])
-				continue;
-			if (pf_init_unit(pf, 0, conf[D_PRT], conf[D_MOD],
-				    conf[D_UNI], conf[D_PRO], conf[D_DLY],
-				    verbose))
-				found++;
-		}
-	}
-	if (!found) {
-		printk("%s: No ATAPI disk detected\n", name);
-		goto out_unregister_pi_driver;
-	}
-	pf_busy = 0;
-	return 0;
-
-out_unregister_pi_driver:
-	pi_unregister_driver(par_drv);
-out_unregister_blkdev:
-	unregister_blkdev(major, name);
-	return -ENODEV;
-}
-
-static void __exit pf_exit(void)
-{
-	struct pf_unit *pf;
-	int unit;
-
-	for (pf = units, unit = 0; unit < PF_UNITS; pf++, unit++) {
-		if (!pf->present)
-			continue;
-		del_gendisk(pf->disk);
-		put_disk(pf->disk);
-		blk_mq_free_tag_set(&pf->tag_set);
-		pi_release(pf->pi);
-	}
-
-	unregister_blkdev(major, name);
-}
-
-MODULE_LICENSE("GPL");
-module_init(pf_init)
-module_exit(pf_exit)