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+/*
+ pd.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 IDE hard
+ drives based on chips supported by the paride module.
+
+ By default, the driver will autoprobe for a single parallel
+ port IDE drive, but if their individual parameters are
+ specified, the driver can handle up to 4 drives.
+
+ The behaviour of the pd 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 1-8 integers as follows:
+ drive2
+ drive3 <prt>,<pro>,<uni>,<mod>,<geo>,<sby>,<dly>,<slv>
+
+ 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)
+
+ <geo> this defaults to 0 to indicate that the driver
+ should use the CHS geometry provided by the drive
+ itself. If set to 1, the driver will provide
+ a logical geometry with 64 heads and 32 sectors
+ per track, to be consistent with most SCSI
+ drivers. (0 if not given)
+
+ <sby> set this to zero to disable the power saving
+ standby mode, if needed. (1 if not given)
+
+ <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)
+
+ <slv> IDE disks 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.
+
+
+ major You may use this parameter to overide the
+ default major number (45) 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 "pd")
+
+ 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 kernel
+ the following command line parameters, with the same values
+ as the corresponding module parameters listed above:
+
+ pd.drive0
+ pd.drive1
+ pd.drive2
+ pd.drive3
+ pd.cluster
+ pd.nice
+
+ In addition, you can use the parameter pd.disable to disable
+ the driver entirely.
+
+*/
+
+/* Changes:
+
+ 1.01 GRG 1997.01.24 Restored pd_reset()
+ Added eject ioctl
+ 1.02 GRG 1998.05.06 SMP spinlock changes,
+ Added slave support
+ 1.03 GRG 1998.06.16 Eliminate an Ugh.
+ 1.04 GRG 1998.08.15 Extra debugging, use HZ in loop timing
+ 1.05 GRG 1998.09.24 Added jumbo support
+
+*/
+
+#define PD_VERSION "1.05"
+#define PD_MAJOR 45
+#define PD_NAME "pd"
+#define PD_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.
+
+*/
+#include <linux/types.h>
+
+static bool verbose = 0;
+static int major = PD_MAJOR;
+static char *name = PD_NAME;
+static int cluster = 64;
+static int nice = 0;
+static int disable = 0;
+
+static int drive0[8] = { 0, 0, 0, -1, 0, 1, -1, -1 };
+static int drive1[8] = { 0, 0, 0, -1, 0, 1, -1, -1 };
+static int drive2[8] = { 0, 0, 0, -1, 0, 1, -1, -1 };
+static int drive3[8] = { 0, 0, 0, -1, 0, 1, -1, -1 };
+
+static int (*drives[4])[8] = {&drive0, &drive1, &drive2, &drive3};
+
+enum {D_PRT, D_PRO, D_UNI, D_MOD, D_GEO, D_SBY, D_DLY, D_SLV};
+
+/* end of parameters */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/gfp.h>
+#include <linux/fs.h>
+#include <linux/delay.h>
+#include <linux/hdreg.h>
+#include <linux/cdrom.h> /* for the eject ioctl */
+#include <linux/blkdev.h>
+#include <linux/blkpg.h>
+#include <linux/kernel.h>
+#include <linux/mutex.h>
+#include <asm/uaccess.h>
+#include <linux/workqueue.h>
+
+static DEFINE_MUTEX(pd_mutex);
+static DEFINE_SPINLOCK(pd_lock);
+
+module_param(verbose, bool, 0);
+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"
+
+#define PD_BITS 4
+
+/* numbers for "SCSI" geometry */
+
+#define PD_LOG_HEADS 64
+#define PD_LOG_SECTS 32
+
+#define PD_ID_OFF 54
+#define PD_ID_LEN 14
+
+#define PD_MAX_RETRIES 5
+#define PD_TMO 800 /* interrupt timeout in jiffies */
+#define PD_SPIN_DEL 50 /* spin delay in micro-seconds */
+
+#define PD_SPIN (1000000*PD_TMO)/(HZ*PD_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 ERR_AMNF 0x00100
+#define ERR_TK0NF 0x00200
+#define ERR_ABRT 0x00400
+#define ERR_MCR 0x00800
+#define ERR_IDNF 0x01000
+#define ERR_MC 0x02000
+#define ERR_UNC 0x04000
+#define ERR_TMO 0x10000
+
+#define IDE_READ 0x20
+#define IDE_WRITE 0x30
+#define IDE_READ_VRFY 0x40
+#define IDE_INIT_DEV_PARMS 0x91
+#define IDE_STANDBY 0x96
+#define IDE_ACKCHANGE 0xdb
+#define IDE_DOORLOCK 0xde
+#define IDE_DOORUNLOCK 0xdf
+#define IDE_IDENTIFY 0xec
+#define IDE_EJECT 0xed
+
+#define PD_NAMELEN 8
+
+struct pd_unit {
+ struct pi_adapter pia; /* interface to paride layer */
+ struct pi_adapter *pi;
+ int access; /* count of active opens ... */
+ int capacity; /* Size of this volume in sectors */
+ int heads; /* physical geometry */
+ int sectors;
+ int cylinders;
+ int can_lba;
+ int drive; /* master=0 slave=1 */
+ int changed; /* Have we seen a disk change ? */
+ int removable; /* removable media device ? */
+ int standby;
+ int alt_geom;
+ char name[PD_NAMELEN]; /* pda, pdb, etc ... */
+ struct gendisk *gd;
+};
+
+static struct pd_unit pd[PD_UNITS];
+
+static char pd_scratch[512]; /* scratch block buffer */
+
+static char *pd_errs[17] = { "ERR", "INDEX", "ECC", "DRQ", "SEEK", "WRERR",
+ "READY", "BUSY", "AMNF", "TK0NF", "ABRT", "MCR",
+ "IDNF", "MC", "UNC", "???", "TMO"
+};
+
+static inline int status_reg(struct pd_unit *disk)
+{
+ return pi_read_regr(disk->pi, 1, 6);
+}
+
+static inline int read_reg(struct pd_unit *disk, int reg)
+{
+ return pi_read_regr(disk->pi, 0, reg);
+}
+
+static inline void write_status(struct pd_unit *disk, int val)
+{
+ pi_write_regr(disk->pi, 1, 6, val);
+}
+
+static inline void write_reg(struct pd_unit *disk, int reg, int val)
+{
+ pi_write_regr(disk->pi, 0, reg, val);
+}
+
+static inline u8 DRIVE(struct pd_unit *disk)
+{
+ return 0xa0+0x10*disk->drive;
+}
+
+/* ide command interface */
+
+static void pd_print_error(struct pd_unit *disk, char *msg, int status)
+{
+ int i;
+
+ printk("%s: %s: status = 0x%x =", disk->name, msg, status);
+ for (i = 0; i < ARRAY_SIZE(pd_errs); i++)
+ if (status & (1 << i))
+ printk(" %s", pd_errs[i]);
+ printk("\n");
+}
+
+static void pd_reset(struct pd_unit *disk)
+{ /* called only for MASTER drive */
+ write_status(disk, 4);
+ udelay(50);
+ write_status(disk, 0);
+ udelay(250);
+}
+
+#define DBMSG(msg) ((verbose>1)?(msg):NULL)
+
+static int pd_wait_for(struct pd_unit *disk, int w, char *msg)
+{ /* polled wait */
+ int k, r, e;
+
+ k = 0;
+ while (k < PD_SPIN) {
+ r = status_reg(disk);
+ k++;
+ if (((r & w) == w) && !(r & STAT_BUSY))
+ break;
+ udelay(PD_SPIN_DEL);
+ }
+ e = (read_reg(disk, 1) << 8) + read_reg(disk, 7);
+ if (k >= PD_SPIN)
+ e |= ERR_TMO;
+ if ((e & (STAT_ERR | ERR_TMO)) && (msg != NULL))
+ pd_print_error(disk, msg, e);
+ return e;
+}
+
+static void pd_send_command(struct pd_unit *disk, int n, int s, int h, int c0, int c1, int func)
+{
+ write_reg(disk, 6, DRIVE(disk) + h);
+ write_reg(disk, 1, 0); /* the IDE task file */
+ write_reg(disk, 2, n);
+ write_reg(disk, 3, s);
+ write_reg(disk, 4, c0);
+ write_reg(disk, 5, c1);
+ write_reg(disk, 7, func);
+
+ udelay(1);
+}
+
+static void pd_ide_command(struct pd_unit *disk, int func, int block, int count)
+{
+ int c1, c0, h, s;
+
+ if (disk->can_lba) {
+ s = block & 255;
+ c0 = (block >>= 8) & 255;
+ c1 = (block >>= 8) & 255;
+ h = ((block >>= 8) & 15) + 0x40;
+ } else {
+ s = (block % disk->sectors) + 1;
+ h = (block /= disk->sectors) % disk->heads;
+ c0 = (block /= disk->heads) % 256;
+ c1 = (block >>= 8);
+ }
+ pd_send_command(disk, count, s, h, c0, c1, func);
+}
+
+/* The i/o request engine */
+
+enum action {Fail = 0, Ok = 1, Hold, Wait};
+
+static struct request *pd_req; /* current request */
+static enum action (*phase)(void);
+
+static void run_fsm(void);
+
+static void ps_tq_int(struct work_struct *work);
+
+static DECLARE_DELAYED_WORK(fsm_tq, ps_tq_int);
+
+static void schedule_fsm(void)
+{
+ if (!nice)
+ schedule_delayed_work(&fsm_tq, 0);
+ else
+ schedule_delayed_work(&fsm_tq, nice-1);
+}
+
+static void ps_tq_int(struct work_struct *work)
+{
+ run_fsm();
+}
+
+static enum action do_pd_io_start(void);
+static enum action pd_special(void);
+static enum action do_pd_read_start(void);
+static enum action do_pd_write_start(void);
+static enum action do_pd_read_drq(void);
+static enum action do_pd_write_done(void);
+
+static struct request_queue *pd_queue;
+static int pd_claimed;
+
+static struct pd_unit *pd_current; /* current request's drive */
+static PIA *pi_current; /* current request's PIA */
+
+static void run_fsm(void)
+{
+ while (1) {
+ enum action res;
+ unsigned long saved_flags;
+ int stop = 0;
+
+ if (!phase) {
+ pd_current = pd_req->rq_disk->private_data;
+ pi_current = pd_current->pi;
+ phase = do_pd_io_start;
+ }
+
+ switch (pd_claimed) {
+ case 0:
+ pd_claimed = 1;
+ if (!pi_schedule_claimed(pi_current, run_fsm))
+ return;
+ case 1:
+ pd_claimed = 2;
+ pi_current->proto->connect(pi_current);
+ }
+
+ switch(res = phase()) {
+ case Ok: case Fail:
+ pi_disconnect(pi_current);
+ pd_claimed = 0;
+ phase = NULL;
+ spin_lock_irqsave(&pd_lock, saved_flags);
+ if (!__blk_end_request_cur(pd_req,
+ res == Ok ? 0 : -EIO)) {
+ pd_req = blk_fetch_request(pd_queue);
+ if (!pd_req)
+ stop = 1;
+ }
+ spin_unlock_irqrestore(&pd_lock, saved_flags);
+ if (stop)
+ return;
+ case Hold:
+ schedule_fsm();
+ return;
+ case Wait:
+ pi_disconnect(pi_current);
+ pd_claimed = 0;
+ }
+ }
+}
+
+static int pd_retries = 0; /* i/o error retry count */
+static int pd_block; /* address of next requested block */
+static int pd_count; /* number of blocks still to do */
+static int pd_run; /* sectors in current cluster */
+static int pd_cmd; /* current command READ/WRITE */
+static char *pd_buf; /* buffer for request in progress */
+
+static enum action do_pd_io_start(void)
+{
+ if (pd_req->cmd_type == REQ_TYPE_SPECIAL) {
+ phase = pd_special;
+ return pd_special();
+ }
+
+ pd_cmd = rq_data_dir(pd_req);
+ if (pd_cmd == READ || pd_cmd == WRITE) {
+ pd_block = blk_rq_pos(pd_req);
+ pd_count = blk_rq_cur_sectors(pd_req);
+ if (pd_block + pd_count > get_capacity(pd_req->rq_disk))
+ return Fail;
+ pd_run = blk_rq_sectors(pd_req);
+ pd_buf = bio_data(pd_req->bio);
+ pd_retries = 0;
+ if (pd_cmd == READ)
+ return do_pd_read_start();
+ else
+ return do_pd_write_start();
+ }
+ return Fail;
+}
+
+static enum action pd_special(void)
+{
+ enum action (*func)(struct pd_unit *) = pd_req->special;
+ return func(pd_current);
+}
+
+static int pd_next_buf(void)
+{
+ unsigned long saved_flags;
+
+ pd_count--;
+ pd_run--;
+ pd_buf += 512;
+ pd_block++;
+ if (!pd_run)
+ return 1;
+ if (pd_count)
+ return 0;
+ spin_lock_irqsave(&pd_lock, saved_flags);
+ __blk_end_request_cur(pd_req, 0);
+ pd_count = blk_rq_cur_sectors(pd_req);
+ pd_buf = bio_data(pd_req->bio);
+ spin_unlock_irqrestore(&pd_lock, saved_flags);
+ return 0;
+}
+
+static unsigned long pd_timeout;
+
+static enum action do_pd_read_start(void)
+{
+ if (pd_wait_for(pd_current, STAT_READY, "do_pd_read") & STAT_ERR) {
+ if (pd_retries < PD_MAX_RETRIES) {
+ pd_retries++;
+ return Wait;
+ }
+ return Fail;
+ }
+ pd_ide_command(pd_current, IDE_READ, pd_block, pd_run);
+ phase = do_pd_read_drq;
+ pd_timeout = jiffies + PD_TMO;
+ return Hold;
+}
+
+static enum action do_pd_write_start(void)
+{
+ if (pd_wait_for(pd_current, STAT_READY, "do_pd_write") & STAT_ERR) {
+ if (pd_retries < PD_MAX_RETRIES) {
+ pd_retries++;
+ return Wait;
+ }
+ return Fail;
+ }
+ pd_ide_command(pd_current, IDE_WRITE, pd_block, pd_run);
+ while (1) {
+ if (pd_wait_for(pd_current, STAT_DRQ, "do_pd_write_drq") & STAT_ERR) {
+ if (pd_retries < PD_MAX_RETRIES) {
+ pd_retries++;
+ return Wait;
+ }
+ return Fail;
+ }
+ pi_write_block(pd_current->pi, pd_buf, 512);
+ if (pd_next_buf())
+ break;
+ }
+ phase = do_pd_write_done;
+ pd_timeout = jiffies + PD_TMO;
+ return Hold;
+}
+
+static inline int pd_ready(void)
+{
+ return !(status_reg(pd_current) & STAT_BUSY);
+}
+
+static enum action do_pd_read_drq(void)
+{
+ if (!pd_ready() && !time_after_eq(jiffies, pd_timeout))
+ return Hold;
+
+ while (1) {
+ if (pd_wait_for(pd_current, STAT_DRQ, "do_pd_read_drq") & STAT_ERR) {
+ if (pd_retries < PD_MAX_RETRIES) {
+ pd_retries++;
+ phase = do_pd_read_start;
+ return Wait;
+ }
+ return Fail;
+ }
+ pi_read_block(pd_current->pi, pd_buf, 512);
+ if (pd_next_buf())
+ break;
+ }
+ return Ok;
+}
+
+static enum action do_pd_write_done(void)
+{
+ if (!pd_ready() && !time_after_eq(jiffies, pd_timeout))
+ return Hold;
+
+ if (pd_wait_for(pd_current, STAT_READY, "do_pd_write_done") & STAT_ERR) {
+ if (pd_retries < PD_MAX_RETRIES) {
+ pd_retries++;
+ phase = do_pd_write_start;
+ return Wait;
+ }
+ return Fail;
+ }
+ return Ok;
+}
+
+/* special io requests */
+
+/* According to the ATA standard, the default CHS geometry should be
+ available following a reset. Some Western Digital drives come up
+ in a mode where only LBA addresses are accepted until the device
+ parameters are initialised.
+*/
+
+static void pd_init_dev_parms(struct pd_unit *disk)
+{
+ pd_wait_for(disk, 0, DBMSG("before init_dev_parms"));
+ pd_send_command(disk, disk->sectors, 0, disk->heads - 1, 0, 0,
+ IDE_INIT_DEV_PARMS);
+ udelay(300);
+ pd_wait_for(disk, 0, "Initialise device parameters");
+}
+
+static enum action pd_door_lock(struct pd_unit *disk)
+{
+ if (!(pd_wait_for(disk, STAT_READY, "Lock") & STAT_ERR)) {
+ pd_send_command(disk, 1, 0, 0, 0, 0, IDE_DOORLOCK);
+ pd_wait_for(disk, STAT_READY, "Lock done");
+ }
+ return Ok;
+}
+
+static enum action pd_door_unlock(struct pd_unit *disk)
+{
+ if (!(pd_wait_for(disk, STAT_READY, "Lock") & STAT_ERR)) {
+ pd_send_command(disk, 1, 0, 0, 0, 0, IDE_DOORUNLOCK);
+ pd_wait_for(disk, STAT_READY, "Lock done");
+ }
+ return Ok;
+}
+
+static enum action pd_eject(struct pd_unit *disk)
+{
+ pd_wait_for(disk, 0, DBMSG("before unlock on eject"));
+ pd_send_command(disk, 1, 0, 0, 0, 0, IDE_DOORUNLOCK);
+ pd_wait_for(disk, 0, DBMSG("after unlock on eject"));
+ pd_wait_for(disk, 0, DBMSG("before eject"));
+ pd_send_command(disk, 0, 0, 0, 0, 0, IDE_EJECT);
+ pd_wait_for(disk, 0, DBMSG("after eject"));
+ return Ok;
+}
+
+static enum action pd_media_check(struct pd_unit *disk)
+{
+ int r = pd_wait_for(disk, STAT_READY, DBMSG("before media_check"));
+ if (!(r & STAT_ERR)) {
+ pd_send_command(disk, 1, 1, 0, 0, 0, IDE_READ_VRFY);
+ r = pd_wait_for(disk, STAT_READY, DBMSG("RDY after READ_VRFY"));
+ } else
+ disk->changed = 1; /* say changed if other error */
+ if (r & ERR_MC) {
+ disk->changed = 1;
+ pd_send_command(disk, 1, 0, 0, 0, 0, IDE_ACKCHANGE);
+ pd_wait_for(disk, STAT_READY, DBMSG("RDY after ACKCHANGE"));
+ pd_send_command(disk, 1, 1, 0, 0, 0, IDE_READ_VRFY);
+ r = pd_wait_for(disk, STAT_READY, DBMSG("RDY after VRFY"));
+ }
+ return Ok;
+}
+
+static void pd_standby_off(struct pd_unit *disk)
+{
+ pd_wait_for(disk, 0, DBMSG("before STANDBY"));
+ pd_send_command(disk, 0, 0, 0, 0, 0, IDE_STANDBY);
+ pd_wait_for(disk, 0, DBMSG("after STANDBY"));
+}
+
+static enum action pd_identify(struct pd_unit *disk)
+{
+ int j;
+ char id[PD_ID_LEN + 1];
+
+/* WARNING: here there may be dragons. reset() applies to both drives,
+ but we call it only on probing the MASTER. This should allow most
+ common configurations to work, but be warned that a reset can clear
+ settings on the SLAVE drive.
+*/
+
+ if (disk->drive == 0)
+ pd_reset(disk);
+
+ write_reg(disk, 6, DRIVE(disk));
+ pd_wait_for(disk, 0, DBMSG("before IDENT"));
+ pd_send_command(disk, 1, 0, 0, 0, 0, IDE_IDENTIFY);
+
+ if (pd_wait_for(disk, STAT_DRQ, DBMSG("IDENT DRQ")) & STAT_ERR)
+ return Fail;
+ pi_read_block(disk->pi, pd_scratch, 512);
+ disk->can_lba = pd_scratch[99] & 2;
+ disk->sectors = le16_to_cpu(*(__le16 *) (pd_scratch + 12));
+ disk->heads = le16_to_cpu(*(__le16 *) (pd_scratch + 6));
+ disk->cylinders = le16_to_cpu(*(__le16 *) (pd_scratch + 2));
+ if (disk->can_lba)
+ disk->capacity = le32_to_cpu(*(__le32 *) (pd_scratch + 120));
+ else
+ disk->capacity = disk->sectors * disk->heads * disk->cylinders;
+
+ for (j = 0; j < PD_ID_LEN; j++)
+ id[j ^ 1] = pd_scratch[j + PD_ID_OFF];
+ j = PD_ID_LEN - 1;
+ while ((j >= 0) && (id[j] <= 0x20))
+ j--;
+ j++;
+ id[j] = 0;
+
+ disk->removable = pd_scratch[0] & 0x80;
+
+ printk("%s: %s, %s, %d blocks [%dM], (%d/%d/%d), %s media\n",
+ disk->name, id,
+ disk->drive ? "slave" : "master",
+ disk->capacity, disk->capacity / 2048,
+ disk->cylinders, disk->heads, disk->sectors,
+ disk->removable ? "removable" : "fixed");
+
+ if (disk->capacity)
+ pd_init_dev_parms(disk);
+ if (!disk->standby)
+ pd_standby_off(disk);
+
+ return Ok;
+}
+
+/* end of io request engine */
+
+static void do_pd_request(struct request_queue * q)
+{
+ if (pd_req)
+ return;
+ pd_req = blk_fetch_request(q);
+ if (!pd_req)
+ return;
+
+ schedule_fsm();
+}
+
+static int pd_special_command(struct pd_unit *disk,
+ enum action (*func)(struct pd_unit *disk))
+{
+ struct request *rq;
+ int err = 0;
+
+ rq = blk_get_request(disk->gd->queue, READ, __GFP_WAIT);
+ if (IS_ERR(rq))
+ return PTR_ERR(rq);
+
+ rq->cmd_type = REQ_TYPE_SPECIAL;
+ rq->special = func;
+
+ err = blk_execute_rq(disk->gd->queue, disk->gd, rq, 0);
+
+ blk_put_request(rq);
+ return err;
+}
+
+/* kernel glue structures */
+
+static int pd_open(struct block_device *bdev, fmode_t mode)
+{
+ struct pd_unit *disk = bdev->bd_disk->private_data;
+
+ mutex_lock(&pd_mutex);
+ disk->access++;
+
+ if (disk->removable) {
+ pd_special_command(disk, pd_media_check);
+ pd_special_command(disk, pd_door_lock);
+ }
+ mutex_unlock(&pd_mutex);
+ return 0;
+}
+
+static int pd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
+{
+ struct pd_unit *disk = bdev->bd_disk->private_data;
+
+ if (disk->alt_geom) {
+ geo->heads = PD_LOG_HEADS;
+ geo->sectors = PD_LOG_SECTS;
+ geo->cylinders = disk->capacity / (geo->heads * geo->sectors);
+ } else {
+ geo->heads = disk->heads;
+ geo->sectors = disk->sectors;
+ geo->cylinders = disk->cylinders;
+ }
+
+ return 0;
+}
+
+static int pd_ioctl(struct block_device *bdev, fmode_t mode,
+ unsigned int cmd, unsigned long arg)
+{
+ struct pd_unit *disk = bdev->bd_disk->private_data;
+
+ switch (cmd) {
+ case CDROMEJECT:
+ mutex_lock(&pd_mutex);
+ if (disk->access == 1)
+ pd_special_command(disk, pd_eject);
+ mutex_unlock(&pd_mutex);
+ return 0;
+ default:
+ return -EINVAL;
+ }
+}
+
+static void pd_release(struct gendisk *p, fmode_t mode)
+{
+ struct pd_unit *disk = p->private_data;
+
+ mutex_lock(&pd_mutex);
+ if (!--disk->access && disk->removable)
+ pd_special_command(disk, pd_door_unlock);
+ mutex_unlock(&pd_mutex);
+}
+
+static unsigned int pd_check_events(struct gendisk *p, unsigned int clearing)
+{
+ struct pd_unit *disk = p->private_data;
+ int r;
+ if (!disk->removable)
+ return 0;
+ pd_special_command(disk, pd_media_check);
+ r = disk->changed;
+ disk->changed = 0;
+ return r ? DISK_EVENT_MEDIA_CHANGE : 0;
+}
+
+static int pd_revalidate(struct gendisk *p)
+{
+ struct pd_unit *disk = p->private_data;
+ if (pd_special_command(disk, pd_identify) == 0)
+ set_capacity(p, disk->capacity);
+ else
+ set_capacity(p, 0);
+ return 0;
+}
+
+static const struct block_device_operations pd_fops = {
+ .owner = THIS_MODULE,
+ .open = pd_open,
+ .release = pd_release,
+ .ioctl = pd_ioctl,
+ .getgeo = pd_getgeo,
+ .check_events = pd_check_events,
+ .revalidate_disk= pd_revalidate
+};
+
+/* probing */
+
+static void pd_probe_drive(struct pd_unit *disk)
+{
+ struct gendisk *p = alloc_disk(1 << PD_BITS);
+ if (!p)
+ return;
+ strcpy(p->disk_name, disk->name);
+ p->fops = &pd_fops;
+ p->major = major;
+ p->first_minor = (disk - pd) << PD_BITS;
+ disk->gd = p;
+ p->private_data = disk;
+ p->queue = pd_queue;
+
+ if (disk->drive == -1) {
+ for (disk->drive = 0; disk->drive <= 1; disk->drive++)
+ if (pd_special_command(disk, pd_identify) == 0)
+ return;
+ } else if (pd_special_command(disk, pd_identify) == 0)
+ return;
+ disk->gd = NULL;
+ put_disk(p);
+}
+
+static int pd_detect(void)
+{
+ int found = 0, unit, pd_drive_count = 0;
+ struct pd_unit *disk;
+
+ for (unit = 0; unit < PD_UNITS; unit++) {
+ int *parm = *drives[unit];
+ struct pd_unit *disk = pd + unit;
+ disk->pi = &disk->pia;
+ disk->access = 0;
+ disk->changed = 1;
+ disk->capacity = 0;
+ disk->drive = parm[D_SLV];
+ snprintf(disk->name, PD_NAMELEN, "%s%c", name, 'a'+unit);
+ disk->alt_geom = parm[D_GEO];
+ disk->standby = parm[D_SBY];
+ if (parm[D_PRT])
+ pd_drive_count++;
+ }
+
+ if (pd_drive_count == 0) { /* nothing spec'd - so autoprobe for 1 */
+ disk = pd;
+ if (pi_init(disk->pi, 1, -1, -1, -1, -1, -1, pd_scratch,
+ PI_PD, verbose, disk->name)) {
+ pd_probe_drive(disk);
+ if (!disk->gd)
+ pi_release(disk->pi);
+ }
+
+ } else {
+ for (unit = 0, disk = pd; unit < PD_UNITS; unit++, disk++) {
+ int *parm = *drives[unit];
+ if (!parm[D_PRT])
+ continue;
+ if (pi_init(disk->pi, 0, parm[D_PRT], parm[D_MOD],
+ parm[D_UNI], parm[D_PRO], parm[D_DLY],
+ pd_scratch, PI_PD, verbose, disk->name)) {
+ pd_probe_drive(disk);
+ if (!disk->gd)
+ pi_release(disk->pi);
+ }
+ }
+ }
+ for (unit = 0, disk = pd; unit < PD_UNITS; unit++, disk++) {
+ if (disk->gd) {
+ set_capacity(disk->gd, disk->capacity);
+ add_disk(disk->gd);
+ found = 1;
+ }
+ }
+ if (!found)
+ printk("%s: no valid drive found\n", name);
+ return found;
+}
+
+static int __init pd_init(void)
+{
+ if (disable)
+ goto out1;
+
+ pd_queue = blk_init_queue(do_pd_request, &pd_lock);
+ if (!pd_queue)
+ goto out1;
+
+ blk_queue_max_hw_sectors(pd_queue, cluster);
+
+ if (register_blkdev(major, name))
+ goto out2;
+
+ printk("%s: %s version %s, major %d, cluster %d, nice %d\n",
+ name, name, PD_VERSION, major, cluster, nice);
+ if (!pd_detect())
+ goto out3;
+
+ return 0;
+
+out3:
+ unregister_blkdev(major, name);
+out2:
+ blk_cleanup_queue(pd_queue);
+out1:
+ return -ENODEV;
+}
+
+static void __exit pd_exit(void)
+{
+ struct pd_unit *disk;
+ int unit;
+ unregister_blkdev(major, name);
+ for (unit = 0, disk = pd; unit < PD_UNITS; unit++, disk++) {
+ struct gendisk *p = disk->gd;
+ if (p) {
+ disk->gd = NULL;
+ del_gendisk(p);
+ put_disk(p);
+ pi_release(disk->pi);
+ }
+ }
+ blk_cleanup_queue(pd_queue);
+}
+
+MODULE_LICENSE("GPL");
+module_init(pd_init)
+module_exit(pd_exit)
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-12 10:34:24 +0000