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Diffstat (limited to 'drivers/block/paride/pcd.c')
| -rw-r--r-- | drivers/block/paride/pcd.c | 1068 |
1 files changed, 1068 insertions, 0 deletions
diff --git a/drivers/block/paride/pcd.c b/drivers/block/paride/pcd.c new file mode 100644 index 000000000..70da8b86c --- /dev/null +++ b/drivers/block/paride/pcd.c @@ -0,0 +1,1068 @@ +/* + 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 int pcd_detect(void); +static void pcd_probe_capabilities(void); +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 void pcd_init_units(void) +{ + struct pcd_unit *cd; + int unit; + + pcd_drive_count = 0; + for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++) { + struct gendisk *disk = alloc_disk(1); + + if (!disk) + continue; + + disk->queue = blk_mq_init_sq_queue(&cd->tag_set, &pcd_mq_ops, + 1, BLK_MQ_F_SHOULD_MERGE); + if (IS_ERR(disk->queue)) { + disk->queue = NULL; + put_disk(disk); + continue; + } + + INIT_LIST_HEAD(&cd->rq_list); + disk->queue->queuedata = cd; + 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[unit])[D_SLV]; + if ((*drives[unit])[D_PRT]) + pcd_drive_count++; + + 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; + strcpy(disk->disk_name, cd->name); /* umm... */ + disk->fops = &pcd_bdops; + disk->flags = GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE; + disk->events = DISK_EVENT_MEDIA_CHANGE; + } +} + +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) +{ + int k, s; + char id_cmd[12] = { 0x12, 0, 0, 0, 36, 0, 0, 0, 0, 0, 0, 0 }; + + 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 + * -1, if drive detection failed + */ +static int pcd_probe(struct pcd_unit *cd, int ms, char *id) +{ + if (ms == -1) { + for (cd->drive = 0; cd->drive <= 1; cd->drive++) + if (!pcd_reset(cd) && !pcd_identify(cd, id)) + return 0; + } else { + cd->drive = ms; + if (!pcd_reset(cd) && !pcd_identify(cd, id)) + return 0; + } + return -1; +} + +static void pcd_probe_capabilities(void) +{ + int unit, r; + char buffer[32]; + char cmd[12] = { 0x5a, 1 << 3, 0x2a, 0, 0, 0, 0, 18, 0, 0, 0, 0 }; + struct pcd_unit *cd; + + for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++) { + if (!cd->present) + continue; + r = pcd_atapi(cd, cmd, 18, buffer, "mode sense capabilities"); + if (r) + continue; + /* 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; + } +} + +static int pcd_detect(void) +{ + char id[18]; + int k, unit; + struct pcd_unit *cd; + + printk("%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); + return -1; + } + + k = 0; + if (pcd_drive_count == 0) { /* nothing spec'd - so autoprobe for 1 */ + cd = pcd; + if (cd->disk && pi_init(cd->pi, 1, -1, -1, -1, -1, -1, + pcd_buffer, PI_PCD, verbose, cd->name)) { + if (!pcd_probe(cd, -1, id)) { + cd->present = 1; + k++; + } else + pi_release(cd->pi); + } + } else { + for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++) { + int *conf = *drives[unit]; + if (!conf[D_PRT]) + continue; + if (!cd->disk) + continue; + if (!pi_init(cd->pi, 0, conf[D_PRT], conf[D_MOD], + conf[D_UNI], conf[D_PRO], conf[D_DLY], + pcd_buffer, PI_PCD, verbose, cd->name)) + continue; + if (!pcd_probe(cd, conf[D_SLV], id)) { + cd->present = 1; + k++; + } else + pi_release(cd->pi); + } + } + if (k) + return 0; + + printk("%s: No CD-ROM drive found\n", name); + for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++) { + if (!cd->disk) + continue; + blk_cleanup_queue(cd->disk->queue); + cd->disk->queue = NULL; + blk_mq_free_tag_set(&cd->tag_set); + put_disk(cd->disk); + } + pi_unregister_driver(par_drv); + return -1; +} + +/* 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->rq_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 __init pcd_init(void) +{ + struct pcd_unit *cd; + int unit; + + if (disable) + return -EINVAL; + + pcd_init_units(); + + if (pcd_detect()) + return -ENODEV; + + /* get the atapi capabilities page */ + pcd_probe_capabilities(); + + if (register_blkdev(major, name)) { + for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++) { + if (!cd->disk) + continue; + + blk_cleanup_queue(cd->disk->queue); + blk_mq_free_tag_set(&cd->tag_set); + put_disk(cd->disk); + } + return -EBUSY; + } + + for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++) { + if (cd->present) { + register_cdrom(cd->disk, &cd->info); + cd->disk->private_data = cd; + add_disk(cd->disk); + } + } + + return 0; +} + +static void __exit pcd_exit(void) +{ + struct pcd_unit *cd; + int unit; + + for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++) { + if (!cd->disk) + continue; + + if (cd->present) { + del_gendisk(cd->disk); + pi_release(cd->pi); + unregister_cdrom(&cd->info); + } + blk_cleanup_queue(cd->disk->queue); + blk_mq_free_tag_set(&cd->tag_set); + put_disk(cd->disk); + } + unregister_blkdev(major, name); + pi_unregister_driver(par_drv); +} + +MODULE_LICENSE("GPL"); +module_init(pcd_init) +module_exit(pcd_exit) |