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, 1042 deletions

diff --git a/drivers/block/paride/pcd.c b/drivers/block/paride/pcd.c
deleted file mode 100644
index a5ab40784119..000000000000
--- a/drivers/block/paride/pcd.c
+++ /dev/null
@@ -1,1042 +0,0 @@
-/* 
-	pcd.c	(c) 1997-8  Grant R. Guenther <grant@torque.net>
-		            Under the terms of the GNU General Public License.
-
-	This is a high-level driver for parallel port ATAPI CD-ROM
-        drives based on chips supported by the paride module.
-
-        By default, the driver will autoprobe for a single parallel
-        port ATAPI CD-ROM drive, but if their individual parameters are
-        specified, the driver can handle up to 4 drives.
-
-        The behaviour of the pcd 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      1-6 integers as follows:
-            drive2
-            drive3      <prt>,<pro>,<uni>,<mod>,<slv>,<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 CD-ROMs 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.
-
-                <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 (46) 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 "pcd")
-
-            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 kernel command line parameters, with the same values
-        as the corresponding module parameters listed above:
-
-	    pcd.drive0
-	    pcd.drive1
-	    pcd.drive2
-	    pcd.drive3
-	    pcd.nice
-
-        In addition, you can use the parameter pcd.disable to disable
-        the driver entirely.
-
-*/
-
-/* Changes:
-
-	1.01	GRG 1998.01.24	Added test unit ready support
-	1.02    GRG 1998.05.06  Changes to pcd_completion, ready_wait,
-				and loosen interpretation of ATAPI
-			        standard for clearing error status.
-				Use spinlocks. Eliminate sti().
-	1.03    GRG 1998.06.16  Eliminated an Ugh
-	1.04	GRG 1998.08.15  Added extra debugging, improvements to
-				pcd_completion, use HZ in loop timing
-	1.05	GRG 1998.08.16	Conformed to "Uniform CD-ROM" standard
-	1.06    GRG 1998.08.19  Added audio ioctl support
-	1.07    GRG 1998.09.24  Increased reset timeout, added jumbo support
-
-*/
-
-#define	PCD_VERSION	"1.07"
-#define PCD_MAJOR	46
-#define PCD_NAME	"pcd"
-#define PCD_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 = PCD_MAJOR;
-static char *name = PCD_NAME;
-static int nice = 0;
-static int disable = 0;
-
-static int drive0[6] = { 0, 0, 0, -1, -1, -1 };
-static int drive1[6] = { 0, 0, 0, -1, -1, -1 };
-static int drive2[6] = { 0, 0, 0, -1, -1, -1 };
-static int drive3[6] = { 0, 0, 0, -1, -1, -1 };
-
-static int (*drives[4])[6] = {&drive0, &drive1, &drive2, &drive3};
-static int pcd_drive_count;
-
-enum {D_PRT, D_PRO, D_UNI, D_MOD, D_SLV, D_DLY};
-
-/* end of parameters */
-
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/errno.h>
-#include <linux/fs.h>
-#include <linux/kernel.h>
-#include <linux/delay.h>
-#include <linux/cdrom.h>
-#include <linux/spinlock.h>
-#include <linux/blk-mq.h>
-#include <linux/mutex.h>
-#include <linux/uaccess.h>
-
-static DEFINE_MUTEX(pcd_mutex);
-static DEFINE_SPINLOCK(pcd_lock);
-
-module_param(verbose, int, 0644);
-module_param(major, int, 0);
-module_param(name, charp, 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"
-
-#define PCD_RETRIES	     5
-#define PCD_TMO		   800	/* timeout in jiffies */
-#define PCD_DELAY           50	/* spin delay in uS */
-#define PCD_READY_TMO	    20	/* in seconds */
-#define PCD_RESET_TMO	   100	/* in tenths of a second */
-
-#define PCD_SPIN	(1000000*PCD_TMO)/(HZ*PCD_DELAY)
-
-#define IDE_ERR		0x01
-#define IDE_DRQ         0x08
-#define IDE_READY       0x40
-#define IDE_BUSY        0x80
-
-static int pcd_open(struct cdrom_device_info *cdi, int purpose);
-static void pcd_release(struct cdrom_device_info *cdi);
-static int pcd_drive_status(struct cdrom_device_info *cdi, int slot_nr);
-static unsigned int pcd_check_events(struct cdrom_device_info *cdi,
-				     unsigned int clearing, int slot_nr);
-static int pcd_tray_move(struct cdrom_device_info *cdi, int position);
-static int pcd_lock_door(struct cdrom_device_info *cdi, int lock);
-static int pcd_drive_reset(struct cdrom_device_info *cdi);
-static int pcd_get_mcn(struct cdrom_device_info *cdi, struct cdrom_mcn *mcn);
-static int pcd_audio_ioctl(struct cdrom_device_info *cdi,
-			   unsigned int cmd, void *arg);
-static int pcd_packet(struct cdrom_device_info *cdi,
-		      struct packet_command *cgc);
-
-static void do_pcd_read_drq(void);
-static blk_status_t pcd_queue_rq(struct blk_mq_hw_ctx *hctx,
-				 const struct blk_mq_queue_data *bd);
-static void do_pcd_read(void);
-
-struct pcd_unit {
-	struct pi_adapter pia;	/* interface to paride layer */
-	struct pi_adapter *pi;
-	int drive;		/* master/slave */
-	int last_sense;		/* result of last request sense */
-	int changed;		/* media change seen */
-	int present;		/* does this unit exist ? */
-	char *name;		/* pcd0, pcd1, etc */
-	struct cdrom_device_info info;	/* uniform cdrom interface */
-	struct gendisk *disk;
-	struct blk_mq_tag_set tag_set;
-	struct list_head rq_list;
-};
-
-static struct pcd_unit pcd[PCD_UNITS];
-
-static char pcd_scratch[64];
-static char pcd_buffer[2048];	/* raw block buffer */
-static int pcd_bufblk = -1;	/* block in buffer, in CD units,
-				   -1 for nothing there. See also
-				   pd_unit.
-				 */
-
-/* the variables below are used mainly in the I/O request engine, which
-   processes only one request at a time.
-*/
-
-static struct pcd_unit *pcd_current; /* current request's drive */
-static struct request *pcd_req;
-static int pcd_retries;		/* retries on current request */
-static int pcd_busy;		/* request being processed ? */
-static int pcd_sector;		/* address of next requested sector */
-static int pcd_count;		/* number of blocks still to do */
-static char *pcd_buf;		/* buffer for request in progress */
-static void *par_drv;		/* reference of parport driver */
-
-/* kernel glue structures */
-
-static int pcd_block_open(struct block_device *bdev, fmode_t mode)
-{
-	struct pcd_unit *cd = bdev->bd_disk->private_data;
-	int ret;
-
-	bdev_check_media_change(bdev);
-
-	mutex_lock(&pcd_mutex);
-	ret = cdrom_open(&cd->info, bdev, mode);
-	mutex_unlock(&pcd_mutex);
-
-	return ret;
-}
-
-static void pcd_block_release(struct gendisk *disk, fmode_t mode)
-{
-	struct pcd_unit *cd = disk->private_data;
-	mutex_lock(&pcd_mutex);
-	cdrom_release(&cd->info, mode);
-	mutex_unlock(&pcd_mutex);
-}
-
-static int pcd_block_ioctl(struct block_device *bdev, fmode_t mode,
-				unsigned cmd, unsigned long arg)
-{
-	struct pcd_unit *cd = bdev->bd_disk->private_data;
-	int ret;
-
-	mutex_lock(&pcd_mutex);
-	ret = cdrom_ioctl(&cd->info, bdev, mode, cmd, arg);
-	mutex_unlock(&pcd_mutex);
-
-	return ret;
-}
-
-static unsigned int pcd_block_check_events(struct gendisk *disk,
-					   unsigned int clearing)
-{
-	struct pcd_unit *cd = disk->private_data;
-	return cdrom_check_events(&cd->info, clearing);
-}
-
-static const struct block_device_operations pcd_bdops = {
-	.owner		= THIS_MODULE,
-	.open		= pcd_block_open,
-	.release	= pcd_block_release,
-	.ioctl		= pcd_block_ioctl,
-#ifdef CONFIG_COMPAT
-	.compat_ioctl	= blkdev_compat_ptr_ioctl,
-#endif
-	.check_events	= pcd_block_check_events,
-};
-
-static const struct cdrom_device_ops pcd_dops = {
-	.open		= pcd_open,
-	.release	= pcd_release,
-	.drive_status	= pcd_drive_status,
-	.check_events	= pcd_check_events,
-	.tray_move	= pcd_tray_move,
-	.lock_door	= pcd_lock_door,
-	.get_mcn	= pcd_get_mcn,
-	.reset		= pcd_drive_reset,
-	.audio_ioctl	= pcd_audio_ioctl,
-	.generic_packet	= pcd_packet,
-	.capability	= CDC_CLOSE_TRAY | CDC_OPEN_TRAY | CDC_LOCK |
-			  CDC_MCN | CDC_MEDIA_CHANGED | CDC_RESET |
-			  CDC_PLAY_AUDIO | CDC_GENERIC_PACKET | CDC_CD_R |
-			  CDC_CD_RW,
-};
-
-static const struct blk_mq_ops pcd_mq_ops = {
-	.queue_rq	= pcd_queue_rq,
-};
-
-static int pcd_open(struct cdrom_device_info *cdi, int purpose)
-{
-	struct pcd_unit *cd = cdi->handle;
-	if (!cd->present)
-		return -ENODEV;
-	return 0;
-}
-
-static void pcd_release(struct cdrom_device_info *cdi)
-{
-}
-
-static inline int status_reg(struct pcd_unit *cd)
-{
-	return pi_read_regr(cd->pi, 1, 6);
-}
-
-static inline int read_reg(struct pcd_unit *cd, int reg)
-{
-	return pi_read_regr(cd->pi, 0, reg);
-}
-
-static inline void write_reg(struct pcd_unit *cd, int reg, int val)
-{
-	pi_write_regr(cd->pi, 0, reg, val);
-}
-
-static int pcd_wait(struct pcd_unit *cd, int go, int stop, char *fun, char *msg)
-{
-	int j, r, e, s, p;
-
-	j = 0;
-	while ((((r = status_reg(cd)) & go) || (stop && (!(r & stop))))
-	       && (j++ < PCD_SPIN))
-		udelay(PCD_DELAY);
-
-	if ((r & (IDE_ERR & stop)) || (j > PCD_SPIN)) {
-		s = read_reg(cd, 7);
-		e = read_reg(cd, 1);
-		p = read_reg(cd, 2);
-		if (j > PCD_SPIN)
-			e |= 0x100;
-		if (fun)
-			printk("%s: %s %s: alt=0x%x stat=0x%x err=0x%x"
-			       " loop=%d phase=%d\n",
-			       cd->name, fun, msg, r, s, e, j, p);
-		return (s << 8) + r;
-	}
-	return 0;
-}
-
-static int pcd_command(struct pcd_unit *cd, char *cmd, int dlen, char *fun)
-{
-	pi_connect(cd->pi);
-
-	write_reg(cd, 6, 0xa0 + 0x10 * cd->drive);
-
-	if (pcd_wait(cd, IDE_BUSY | IDE_DRQ, 0, fun, "before command")) {
-		pi_disconnect(cd->pi);
-		return -1;
-	}
-
-	write_reg(cd, 4, dlen % 256);
-	write_reg(cd, 5, dlen / 256);
-	write_reg(cd, 7, 0xa0);	/* ATAPI packet command */
-
-	if (pcd_wait(cd, IDE_BUSY, IDE_DRQ, fun, "command DRQ")) {
-		pi_disconnect(cd->pi);
-		return -1;
-	}
-
-	if (read_reg(cd, 2) != 1) {
-		printk("%s: %s: command phase error\n", cd->name, fun);
-		pi_disconnect(cd->pi);
-		return -1;
-	}
-
-	pi_write_block(cd->pi, cmd, 12);
-
-	return 0;
-}
-
-static int pcd_completion(struct pcd_unit *cd, char *buf, char *fun)
-{
-	int r, d, p, n, k, j;
-
-	r = -1;
-	k = 0;
-	j = 0;
-
-	if (!pcd_wait(cd, IDE_BUSY, IDE_DRQ | IDE_READY | IDE_ERR,
-		      fun, "completion")) {
-		r = 0;
-		while (read_reg(cd, 7) & IDE_DRQ) {
-			d = read_reg(cd, 4) + 256 * read_reg(cd, 5);
-			n = (d + 3) & 0xfffc;
-			p = read_reg(cd, 2) & 3;
-
-			if ((p == 2) && (n > 0) && (j == 0)) {
-				pi_read_block(cd->pi, buf, n);
-				if (verbose > 1)
-					printk("%s: %s: Read %d bytes\n",
-					       cd->name, fun, n);
-				r = 0;
-				j++;
-			} else {
-				if (verbose > 1)
-					printk
-					    ("%s: %s: Unexpected phase %d, d=%d, k=%d\n",
-					     cd->name, fun, p, d, k);
-				if (verbose < 2)
-					printk_once(
-					    "%s: WARNING: ATAPI phase errors\n",
-					    cd->name);
-				mdelay(1);
-			}
-			if (k++ > PCD_TMO) {
-				printk("%s: Stuck DRQ\n", cd->name);
-				break;
-			}
-			if (pcd_wait
-			    (cd, IDE_BUSY, IDE_DRQ | IDE_READY | IDE_ERR, fun,
-			     "completion")) {
-				r = -1;
-				break;
-			}
-		}
-	}
-
-	pi_disconnect(cd->pi);
-
-	return r;
-}
-
-static void pcd_req_sense(struct pcd_unit *cd, char *fun)
-{
-	char rs_cmd[12] = { 0x03, 0, 0, 0, 16, 0, 0, 0, 0, 0, 0, 0 };
-	char buf[16];
-	int r, c;
-
-	r = pcd_command(cd, rs_cmd, 16, "Request sense");
-	mdelay(1);
-	if (!r)
-		pcd_completion(cd, buf, "Request sense");
-
-	cd->last_sense = -1;
-	c = 2;
-	if (!r) {
-		if (fun)
-			printk("%s: %s: Sense key: %x, ASC: %x, ASQ: %x\n",
-			       cd->name, fun, buf[2] & 0xf, buf[12], buf[13]);
-		c = buf[2] & 0xf;
-		cd->last_sense =
-		    c | ((buf[12] & 0xff) << 8) | ((buf[13] & 0xff) << 16);
-	}
-	if ((c == 2) || (c == 6))
-		cd->changed = 1;
-}
-
-static int pcd_atapi(struct pcd_unit *cd, char *cmd, int dlen, char *buf, char *fun)
-{
-	int r;
-
-	r = pcd_command(cd, cmd, dlen, fun);
-	mdelay(1);
-	if (!r)
-		r = pcd_completion(cd, buf, fun);
-	if (r)
-		pcd_req_sense(cd, fun);
-
-	return r;
-}
-
-static int pcd_packet(struct cdrom_device_info *cdi, struct packet_command *cgc)
-{
-	return pcd_atapi(cdi->handle, cgc->cmd, cgc->buflen, cgc->buffer,
-			 "generic packet");
-}
-
-#define DBMSG(msg)	((verbose>1)?(msg):NULL)
-
-static unsigned int pcd_check_events(struct cdrom_device_info *cdi,
-				     unsigned int clearing, int slot_nr)
-{
-	struct pcd_unit *cd = cdi->handle;
-	int res = cd->changed;
-	if (res)
-		cd->changed = 0;
-	return res ? DISK_EVENT_MEDIA_CHANGE : 0;
-}
-
-static int pcd_lock_door(struct cdrom_device_info *cdi, int lock)
-{
-	char un_cmd[12] = { 0x1e, 0, 0, 0, lock, 0, 0, 0, 0, 0, 0, 0 };
-
-	return pcd_atapi(cdi->handle, un_cmd, 0, pcd_scratch,
-			 lock ? "lock door" : "unlock door");
-}
-
-static int pcd_tray_move(struct cdrom_device_info *cdi, int position)
-{
-	char ej_cmd[12] = { 0x1b, 0, 0, 0, 3 - position, 0, 0, 0, 0, 0, 0, 0 };
-
-	return pcd_atapi(cdi->handle, ej_cmd, 0, pcd_scratch,
-			 position ? "eject" : "close tray");
-}
-
-static void pcd_sleep(int cs)
-{
-	schedule_timeout_interruptible(cs);
-}
-
-static int pcd_reset(struct pcd_unit *cd)
-{
-	int i, k, flg;
-	int expect[5] = { 1, 1, 1, 0x14, 0xeb };
-
-	pi_connect(cd->pi);
-	write_reg(cd, 6, 0xa0 + 0x10 * cd->drive);
-	write_reg(cd, 7, 8);
-
-	pcd_sleep(20 * HZ / 1000);	/* delay a bit */
-
-	k = 0;
-	while ((k++ < PCD_RESET_TMO) && (status_reg(cd) & IDE_BUSY))
-		pcd_sleep(HZ / 10);
-
-	flg = 1;
-	for (i = 0; i < 5; i++)
-		flg &= (read_reg(cd, i + 1) == expect[i]);
-
-	if (verbose) {
-		printk("%s: Reset (%d) signature = ", cd->name, k);
-		for (i = 0; i < 5; i++)
-			printk("%3x", read_reg(cd, i + 1));
-		if (!flg)
-			printk(" (incorrect)");
-		printk("\n");
-	}
-
-	pi_disconnect(cd->pi);
-	return flg - 1;
-}
-
-static int pcd_drive_reset(struct cdrom_device_info *cdi)
-{
-	return pcd_reset(cdi->handle);
-}
-
-static int pcd_ready_wait(struct pcd_unit *cd, int tmo)
-{
-	char tr_cmd[12] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
-	int k, p;
-
-	k = 0;
-	while (k < tmo) {
-		cd->last_sense = 0;
-		pcd_atapi(cd, tr_cmd, 0, NULL, DBMSG("test unit ready"));
-		p = cd->last_sense;
-		if (!p)
-			return 0;
-		if (!(((p & 0xffff) == 0x0402) || ((p & 0xff) == 6)))
-			return p;
-		k++;
-		pcd_sleep(HZ);
-	}
-	return 0x000020;	/* timeout */
-}
-
-static int pcd_drive_status(struct cdrom_device_info *cdi, int slot_nr)
-{
-	char rc_cmd[12] = { 0x25, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
-	struct pcd_unit *cd = cdi->handle;
-
-	if (pcd_ready_wait(cd, PCD_READY_TMO))
-		return CDS_DRIVE_NOT_READY;
-	if (pcd_atapi(cd, rc_cmd, 8, pcd_scratch, DBMSG("check media")))
-		return CDS_NO_DISC;
-	return CDS_DISC_OK;
-}
-
-static int pcd_identify(struct pcd_unit *cd)
-{
-	char id_cmd[12] = { 0x12, 0, 0, 0, 36, 0, 0, 0, 0, 0, 0, 0 };
-	char id[18];
-	int k, s;
-
-	pcd_bufblk = -1;
-
-	s = pcd_atapi(cd, id_cmd, 36, pcd_buffer, "identify");
-
-	if (s)
-		return -1;
-	if ((pcd_buffer[0] & 0x1f) != 5) {
-		if (verbose)
-			printk("%s: %s is not a CD-ROM\n",
-			       cd->name, cd->drive ? "Slave" : "Master");
-		return -1;
-	}
-	memcpy(id, pcd_buffer + 16, 16);
-	id[16] = 0;
-	k = 16;
-	while ((k >= 0) && (id[k] <= 0x20)) {
-		id[k] = 0;
-		k--;
-	}
-
-	printk("%s: %s: %s\n", cd->name, cd->drive ? "Slave" : "Master", id);
-
-	return 0;
-}
-
-/*
- * returns 0, with id set if drive is detected, otherwise an error code.
- */
-static int pcd_probe(struct pcd_unit *cd, int ms)
-{
-	if (ms == -1) {
-		for (cd->drive = 0; cd->drive <= 1; cd->drive++)
-			if (!pcd_reset(cd) && !pcd_identify(cd))
-				return 0;
-	} else {
-		cd->drive = ms;
-		if (!pcd_reset(cd) && !pcd_identify(cd))
-			return 0;
-	}
-	return -ENODEV;
-}
-
-static int pcd_probe_capabilities(struct pcd_unit *cd)
-{
-	char cmd[12] = { 0x5a, 1 << 3, 0x2a, 0, 0, 0, 0, 18, 0, 0, 0, 0 };
-	char buffer[32];
-	int ret;
-
-	ret = pcd_atapi(cd, cmd, 18, buffer, "mode sense capabilities");
-	if (ret)
-		return ret;
-
-	/* we should now have the cap page */
-	if ((buffer[11] & 1) == 0)
-		cd->info.mask |= CDC_CD_R;
-	if ((buffer[11] & 2) == 0)
-		cd->info.mask |= CDC_CD_RW;
-	if ((buffer[12] & 1) == 0)
-		cd->info.mask |= CDC_PLAY_AUDIO;
-	if ((buffer[14] & 1) == 0)
-		cd->info.mask |= CDC_LOCK;
-	if ((buffer[14] & 8) == 0)
-		cd->info.mask |= CDC_OPEN_TRAY;
-	if ((buffer[14] >> 6) == 0)
-		cd->info.mask |= CDC_CLOSE_TRAY;
-
-	return 0;
-}
-
-/* I/O request processing */
-static int pcd_queue;
-
-static int set_next_request(void)
-{
-	struct pcd_unit *cd;
-	int old_pos = pcd_queue;
-
-	do {
-		cd = &pcd[pcd_queue];
-		if (++pcd_queue == PCD_UNITS)
-			pcd_queue = 0;
-		if (cd->present && !list_empty(&cd->rq_list)) {
-			pcd_req = list_first_entry(&cd->rq_list, struct request,
-							queuelist);
-			list_del_init(&pcd_req->queuelist);
-			blk_mq_start_request(pcd_req);
-			break;
-		}
-	} while (pcd_queue != old_pos);
-
-	return pcd_req != NULL;
-}
-
-static void pcd_request(void)
-{
-	struct pcd_unit *cd;
-
-	if (pcd_busy)
-		return;
-
-	if (!pcd_req && !set_next_request())
-		return;
-
-	cd = pcd_req->q->disk->private_data;
-	if (cd != pcd_current)
-		pcd_bufblk = -1;
-	pcd_current = cd;
-	pcd_sector = blk_rq_pos(pcd_req);
-	pcd_count = blk_rq_cur_sectors(pcd_req);
-	pcd_buf = bio_data(pcd_req->bio);
-	pcd_busy = 1;
-	ps_set_intr(do_pcd_read, NULL, 0, nice);
-}
-
-static blk_status_t pcd_queue_rq(struct blk_mq_hw_ctx *hctx,
-				 const struct blk_mq_queue_data *bd)
-{
-	struct pcd_unit *cd = hctx->queue->queuedata;
-
-	if (rq_data_dir(bd->rq) != READ) {
-		blk_mq_start_request(bd->rq);
-		return BLK_STS_IOERR;
-	}
-
-	spin_lock_irq(&pcd_lock);
-	list_add_tail(&bd->rq->queuelist, &cd->rq_list);
-	pcd_request();
-	spin_unlock_irq(&pcd_lock);
-
-	return BLK_STS_OK;
-}
-
-static inline void next_request(blk_status_t err)
-{
-	unsigned long saved_flags;
-
-	spin_lock_irqsave(&pcd_lock, saved_flags);
-	if (!blk_update_request(pcd_req, err, blk_rq_cur_bytes(pcd_req))) {
-		__blk_mq_end_request(pcd_req, err);
-		pcd_req = NULL;
-	}
-	pcd_busy = 0;
-	pcd_request();
-	spin_unlock_irqrestore(&pcd_lock, saved_flags);
-}
-
-static int pcd_ready(void)
-{
-	return (((status_reg(pcd_current) & (IDE_BUSY | IDE_DRQ)) == IDE_DRQ));
-}
-
-static void pcd_transfer(void)
-{
-
-	while (pcd_count && (pcd_sector / 4 == pcd_bufblk)) {
-		int o = (pcd_sector % 4) * 512;
-		memcpy(pcd_buf, pcd_buffer + o, 512);
-		pcd_count--;
-		pcd_buf += 512;
-		pcd_sector++;
-	}
-}
-
-static void pcd_start(void)
-{
-	int b, i;
-	char rd_cmd[12] = { 0xa8, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0 };
-
-	pcd_bufblk = pcd_sector / 4;
-	b = pcd_bufblk;
-	for (i = 0; i < 4; i++) {
-		rd_cmd[5 - i] = b & 0xff;
-		b = b >> 8;
-	}
-
-	if (pcd_command(pcd_current, rd_cmd, 2048, "read block")) {
-		pcd_bufblk = -1;
-		next_request(BLK_STS_IOERR);
-		return;
-	}
-
-	mdelay(1);
-
-	ps_set_intr(do_pcd_read_drq, pcd_ready, PCD_TMO, nice);
-}
-
-static void do_pcd_read(void)
-{
-	pcd_busy = 1;
-	pcd_retries = 0;
-	pcd_transfer();
-	if (!pcd_count) {
-		next_request(0);
-		return;
-	}
-
-	pi_do_claimed(pcd_current->pi, pcd_start);
-}
-
-static void do_pcd_read_drq(void)
-{
-	unsigned long saved_flags;
-
-	if (pcd_completion(pcd_current, pcd_buffer, "read block")) {
-		if (pcd_retries < PCD_RETRIES) {
-			mdelay(1);
-			pcd_retries++;
-			pi_do_claimed(pcd_current->pi, pcd_start);
-			return;
-		}
-		pcd_bufblk = -1;
-		next_request(BLK_STS_IOERR);
-		return;
-	}
-
-	do_pcd_read();
-	spin_lock_irqsave(&pcd_lock, saved_flags);
-	pcd_request();
-	spin_unlock_irqrestore(&pcd_lock, saved_flags);
-}
-
-/* the audio_ioctl stuff is adapted from sr_ioctl.c */
-
-static int pcd_audio_ioctl(struct cdrom_device_info *cdi, unsigned int cmd, void *arg)
-{
-	struct pcd_unit *cd = cdi->handle;
-
-	switch (cmd) {
-
-	case CDROMREADTOCHDR:
-
-		{
-			char cmd[12] =
-			    { GPCMD_READ_TOC_PMA_ATIP, 0, 0, 0, 0, 0, 0, 0, 12,
-			 0, 0, 0 };
-			struct cdrom_tochdr *tochdr =
-			    (struct cdrom_tochdr *) arg;
-			char buffer[32];
-			int r;
-
-			r = pcd_atapi(cd, cmd, 12, buffer, "read toc header");
-
-			tochdr->cdth_trk0 = buffer[2];
-			tochdr->cdth_trk1 = buffer[3];
-
-			return r ? -EIO : 0;
-		}
-
-	case CDROMREADTOCENTRY:
-
-		{
-			char cmd[12] =
-			    { GPCMD_READ_TOC_PMA_ATIP, 0, 0, 0, 0, 0, 0, 0, 12,
-			 0, 0, 0 };
-
-			struct cdrom_tocentry *tocentry =
-			    (struct cdrom_tocentry *) arg;
-			unsigned char buffer[32];
-			int r;
-
-			cmd[1] =
-			    (tocentry->cdte_format == CDROM_MSF ? 0x02 : 0);
-			cmd[6] = tocentry->cdte_track;
-
-			r = pcd_atapi(cd, cmd, 12, buffer, "read toc entry");
-
-			tocentry->cdte_ctrl = buffer[5] & 0xf;
-			tocentry->cdte_adr = buffer[5] >> 4;
-			tocentry->cdte_datamode =
-			    (tocentry->cdte_ctrl & 0x04) ? 1 : 0;
-			if (tocentry->cdte_format == CDROM_MSF) {
-				tocentry->cdte_addr.msf.minute = buffer[9];
-				tocentry->cdte_addr.msf.second = buffer[10];
-				tocentry->cdte_addr.msf.frame = buffer[11];
-			} else
-				tocentry->cdte_addr.lba =
-				    (((((buffer[8] << 8) + buffer[9]) << 8)
-				      + buffer[10]) << 8) + buffer[11];
-
-			return r ? -EIO : 0;
-		}
-
-	default:
-
-		return -ENOSYS;
-	}
-}
-
-static int pcd_get_mcn(struct cdrom_device_info *cdi, struct cdrom_mcn *mcn)
-{
-	char cmd[12] =
-	    { GPCMD_READ_SUBCHANNEL, 0, 0x40, 2, 0, 0, 0, 0, 24, 0, 0, 0 };
-	char buffer[32];
-
-	if (pcd_atapi(cdi->handle, cmd, 24, buffer, "get mcn"))
-		return -EIO;
-
-	memcpy(mcn->medium_catalog_number, buffer + 9, 13);
-	mcn->medium_catalog_number[13] = 0;
-
-	return 0;
-}
-
-static int pcd_init_unit(struct pcd_unit *cd, 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(&cd->tag_set, &pcd_mq_ops, 1,
-				      BLK_MQ_F_SHOULD_MERGE);
-	if (ret)
-		return ret;
-
-	disk = blk_mq_alloc_disk(&cd->tag_set, cd);
-	if (IS_ERR(disk)) {
-		ret = PTR_ERR(disk);
-		goto out_free_tag_set;
-	}
-
-	INIT_LIST_HEAD(&cd->rq_list);
-	blk_queue_bounce_limit(disk->queue, BLK_BOUNCE_HIGH);
-	cd->disk = disk;
-	cd->pi = &cd->pia;
-	cd->present = 0;
-	cd->last_sense = 0;
-	cd->changed = 1;
-	cd->drive = (*drives[cd - pcd])[D_SLV];
-
-	cd->name = &cd->info.name[0];
-	snprintf(cd->name, sizeof(cd->info.name), "%s%d", name, unit);
-	cd->info.ops = &pcd_dops;
-	cd->info.handle = cd;
-	cd->info.speed = 0;
-	cd->info.capacity = 1;
-	cd->info.mask = 0;
-	disk->major = major;
-	disk->first_minor = unit;
-	disk->minors = 1;
-	strcpy(disk->disk_name, cd->name);	/* umm... */
-	disk->fops = &pcd_bdops;
-	disk->flags |= GENHD_FL_NO_PART;
-	disk->events = DISK_EVENT_MEDIA_CHANGE;
-	disk->event_flags = DISK_EVENT_FLAG_BLOCK_ON_EXCL_WRITE;
-
-	if (!pi_init(cd->pi, autoprobe, port, mode, unit, protocol, delay,
-			pcd_buffer, PI_PCD, verbose, cd->name)) {
-		ret = -ENODEV;
-		goto out_free_disk;
-	}
-	ret = pcd_probe(cd, ms);
-	if (ret)
-		goto out_pi_release;
-
-	cd->present = 1;
-	pcd_probe_capabilities(cd);
-	ret = register_cdrom(cd->disk, &cd->info);
-	if (ret)
-		goto out_pi_release;
-	ret = add_disk(cd->disk);
-	if (ret)
-		goto out_unreg_cdrom;
-	return 0;
-
-out_unreg_cdrom:
-	unregister_cdrom(&cd->info);
-out_pi_release:
-	pi_release(cd->pi);
-out_free_disk:
-	put_disk(cd->disk);
-out_free_tag_set:
-	blk_mq_free_tag_set(&cd->tag_set);
-	return ret;
-}
-
-static int __init pcd_init(void)
-{
-	int found = 0, unit;
-
-	if (disable)
-		return -EINVAL;
-
-	if (register_blkdev(major, name))
-		return -EBUSY;
-
-	pr_info("%s: %s version %s, major %d, nice %d\n",
-		name, name, PCD_VERSION, major, 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 < PCD_UNITS; unit++) {
-		if ((*drives[unit])[D_PRT])
-			pcd_drive_count++;
-	}
-
-	if (pcd_drive_count == 0) { /* nothing spec'd - so autoprobe for 1 */
-		if (!pcd_init_unit(pcd, 1, -1, -1, -1, -1, -1, -1))
-			found++;
-	} else {
-		for (unit = 0; unit < PCD_UNITS; unit++) {
-			struct pcd_unit *cd = &pcd[unit];
-			int *conf = *drives[unit];
-
-			if (!conf[D_PRT])
-				continue;
-			if (!pcd_init_unit(cd, 0, conf[D_PRT], conf[D_MOD],
-					conf[D_UNI], conf[D_PRO], conf[D_DLY],
-					conf[D_SLV]))
-				found++;
-		}
-	}
-
-	if (!found) {
-		pr_info("%s: No CD-ROM drive found\n", name);
-		goto out_unregister_pi_driver;
-	}
-
-	return 0;
-
-out_unregister_pi_driver:
-	pi_unregister_driver(par_drv);
-out_unregister_blkdev:
-	unregister_blkdev(major, name);
-	return -ENODEV;
-}
-
-static void __exit pcd_exit(void)
-{
-	struct pcd_unit *cd;
-	int unit;
-
-	for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++) {
-		if (!cd->present)
-			continue;
-
-		unregister_cdrom(&cd->info);
-		del_gendisk(cd->disk);
-		pi_release(cd->pi);
-		put_disk(cd->disk);
-
-		blk_mq_free_tag_set(&cd->tag_set);
-	}
-	pi_unregister_driver(par_drv);
-	unregister_blkdev(major, name);
-}
-
-MODULE_LICENSE("GPL");
-module_init(pcd_init)
-module_exit(pcd_exit)