pcd.c
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上传用户:ajay2009
上传日期:2009-05-22
资源大小:495k
文件大小:24k
源码类别:
驱动编程
开发平台:
Unix_Linux
- /*
- 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 overide 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 kernel
- the following 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/blkdev.h>
- #include <asm/uaccess.h>
- static spinlock_t pcd_lock;
- module_param(verbose, bool, 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 int pcd_media_changed(struct cdrom_device_info *cdi, 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 void do_pcd_request(request_queue_t * q);
- 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;
- };
- 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 int pcd_warned; /* Have we logged a phase warning ? */
- /* kernel glue structures */
- static int pcd_block_open(struct inode *inode, struct file *file)
- {
- struct pcd_unit *cd = inode->i_bdev->bd_disk->private_data;
- return cdrom_open(&cd->info, inode, file);
- }
- static int pcd_block_release(struct inode *inode, struct file *file)
- {
- struct pcd_unit *cd = inode->i_bdev->bd_disk->private_data;
- return cdrom_release(&cd->info, file);
- }
- static int pcd_block_ioctl(struct inode *inode, struct file *file,
- unsigned cmd, unsigned long arg)
- {
- struct pcd_unit *cd = inode->i_bdev->bd_disk->private_data;
- return cdrom_ioctl(file, &cd->info, inode, cmd, arg);
- }
- static int pcd_block_media_changed(struct gendisk *disk)
- {
- struct pcd_unit *cd = disk->private_data;
- return cdrom_media_changed(&cd->info);
- }
- static struct block_device_operations pcd_bdops = {
- .owner = THIS_MODULE,
- .open = pcd_block_open,
- .release = pcd_block_release,
- .ioctl = pcd_block_ioctl,
- .media_changed = pcd_block_media_changed,
- };
- static struct cdrom_device_ops pcd_dops = {
- .open = pcd_open,
- .release = pcd_release,
- .drive_status = pcd_drive_status,
- .media_changed = pcd_media_changed,
- .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 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;
- 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;
- }
- }
- 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=%dn",
- 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 errorn", 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 bytesn",
- cd->name, fun, n);
- r = 0;
- j++;
- } else {
- if (verbose > 1)
- printk
- ("%s: %s: Unexpected phase %d, d=%d, k=%dn",
- cd->name, fun, p, d, k);
- if ((verbose < 2) && !pcd_warned) {
- pcd_warned = 1;
- printk
- ("%s: WARNING: ATAPI phase errorsn",
- cd->name);
- }
- mdelay(1);
- }
- if (k++ > PCD_TMO) {
- printk("%s: Stuck DRQn", 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: %xn",
- 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 int pcd_media_changed(struct cdrom_device_info *cdi, int slot_nr)
- {
- struct pcd_unit *cd = cdi->handle;
- int res = cd->changed;
- if (res)
- cd->changed = 0;
- return res;
- }
- 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-ROMn",
- 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: %sn", 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 %dn",
- name, name, PCD_VERSION, major, nice);
- k = 0;
- if (pcd_drive_count == 0) { /* nothing spec'd - so autoprobe for 1 */
- cd = pcd;
- if (pi_init(cd->pi, 1, -1, -1, -1, -1, -1, pcd_buffer,
- PI_PCD, verbose, cd->name)) {
- if (!pcd_probe(cd, -1, id) && cd->disk) {
- 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 (!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->disk) {
- cd->present = 1;
- k++;
- } else
- pi_release(cd->pi);
- }
- }
- if (k)
- return 0;
- printk("%s: No CD-ROM drive foundn", name);
- for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++)
- put_disk(cd->disk);
- return -1;
- }
- /* I/O request processing */
- static struct request_queue *pcd_queue;
- static void do_pcd_request(request_queue_t * q)
- {
- if (pcd_busy)
- return;
- while (1) {
- pcd_req = elv_next_request(q);
- if (!pcd_req)
- return;
- if (rq_data_dir(pcd_req) == READ) {
- struct pcd_unit *cd = pcd_req->rq_disk->private_data;
- if (cd != pcd_current)
- pcd_bufblk = -1;
- pcd_current = cd;
- pcd_sector = pcd_req->sector;
- pcd_count = pcd_req->current_nr_sectors;
- pcd_buf = pcd_req->buffer;
- pcd_busy = 1;
- ps_set_intr(do_pcd_read, NULL, 0, nice);
- return;
- } else
- end_request(pcd_req, 0);
- }
- }
- static inline void next_request(int success)
- {
- unsigned long saved_flags;
- spin_lock_irqsave(&pcd_lock, saved_flags);
- end_request(pcd_req, success);
- pcd_busy = 0;
- do_pcd_request(pcd_queue);
- 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(0);
- 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(1);
- 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(0);
- return;
- }
- do_pcd_read();
- spin_lock_irqsave(&pcd_lock, saved_flags);
- do_pcd_request(pcd_queue);
- 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 -1;
- pcd_init_units();
- if (pcd_detect())
- return -1;
- /* get the atapi capabilities page */
- pcd_probe_capabilities();
- if (register_blkdev(major, name)) {
- for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++)
- put_disk(cd->disk);
- return -1;
- }
- pcd_queue = blk_init_queue(do_pcd_request, &pcd_lock);
- if (!pcd_queue) {
- unregister_blkdev(major, name);
- for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++)
- put_disk(cd->disk);
- return -1;
- }
- for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++) {
- if (cd->present) {
- register_cdrom(&cd->info);
- cd->disk->private_data = cd;
- cd->disk->queue = pcd_queue;
- 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->present) {
- del_gendisk(cd->disk);
- pi_release(cd->pi);
- unregister_cdrom(&cd->info);
- }
- put_disk(cd->disk);
- }
- blk_cleanup_queue(pcd_queue);
- unregister_blkdev(major, name);
- }
- MODULE_LICENSE("GPL");
- module_init(pcd_init)
- module_exit(pcd_exit)