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sonycd535.c
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sonycd535.c
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/*
* Sony CDU-535 interface device driver
*
* This is a modified version of the CDU-31A device driver (see below).
* Changes were made using documentation for the CDU-531 (which Sony
* assures me is very similar to the 535) and partial disassembly of the
* DOS driver. I used Minyard's driver and replaced the CDU-31A
* commands with the CDU-531 commands. This was complicated by a different
* interface protocol with the drive. The driver is still polled.
*
* Data transfer rate is about 110 Kb/sec, theoretical maximum is 150 Kb/sec.
* I tried polling without the sony_sleep during the data transfers but
* it did not speed things up any.
*
* 1993-05-23 (rgj) changed the major number to 21 to get rid of conflict
* with CDU-31A driver. This is the also the number from the Linux
* Device Driver Registry for the Sony Drive. Hope nobody else is using it.
*
* 1993-08-29 (rgj) remove the configuring of the interface board address
* from the top level configuration, you have to modify it in this file.
*
* 1995-01-26 Made module-capable (Joel Katz <[email protected]>)
*
* 1995-05-20
* Modified to support CDU-510/515 series
* (Claudio Porfiri<[email protected]>)
* Fixed to report verify_area() failures
* (Heiko Eissfeldt <[email protected]>)
*
* 1995-06-01
* More changes to support CDU-510/515 series
* (Claudio Porfiri<[email protected]>)
*
* November 1999 -- Make kernel-parameter implementation work with 2.3.x
* Removed init_module & cleanup_module in favor of
* module_init & module_exit.
* Torben Mathiasen <[email protected]>
*
* September 2003 - Fix SMP support by removing cli/sti calls.
* Using spinlocks with a wait_queue instead.
* Felipe Damasio <[email protected]>
*
* Things to do:
* - handle errors and status better, put everything into a single word
* - use interrupts (code mostly there, but a big hole still missing)
* - handle multi-session CDs?
* - use DMA?
*
* Known Bugs:
* -
*
* Ken Pizzini ([email protected])
*
* Original by:
* Ron Jeppesen ([email protected])
*
*
*------------------------------------------------------------------------
* Sony CDROM interface device driver.
*
* Corey Minyard ([email protected]) (CDU-535 complaints to Ken above)
*
* Colossians 3:17
*
* The Sony interface device driver handles Sony interface CDROM
* drives and provides a complete block-level interface as well as an
* ioctl() interface compatible with the Sun (as specified in
* include/linux/cdrom.h). With this interface, CDROMs can be
* accessed and standard audio CDs can be played back normally.
*
* This interface is (unfortunately) a polled interface. This is
* because most Sony interfaces are set up with DMA and interrupts
* disables. Some (like mine) do not even have the capability to
* handle interrupts or DMA. For this reason you will see a bit of
* the following:
*
* snap = jiffies;
* while (jiffies-snap < SONY_JIFFIES_TIMEOUT)
* {
* if (some_condition())
* break;
* sony_sleep();
* }
* if (some_condition not met)
* {
* return an_error;
* }
*
* This ugly hack waits for something to happen, sleeping a little
* between every try. (The conditional is written so that jiffies
* wrap-around is handled properly.)
*
* One thing about these drives: They talk in MSF (Minute Second Frame) format.
* There are 75 frames a second, 60 seconds a minute, and up to 75 minutes on a
* disk. The funny thing is that these are sent to the drive in BCD, but the
* interface wants to see them in decimal. A lot of conversion goes on.
*
* Copyright (C) 1993 Corey Minyard
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
# include <linux/module.h>
#include <linux/errno.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/hdreg.h>
#include <linux/genhd.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/init.h>
#define REALLY_SLOW_IO
#include <asm/system.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <linux/cdrom.h>
#define MAJOR_NR CDU535_CDROM_MAJOR
#include <linux/blkdev.h>
#define sony535_cd_base_io sonycd535 /* for compatible parameter passing with "insmod" */
#include "sonycd535.h"
/*
* this is the base address of the interface card for the Sony CDU-535
* CDROM drive. If your jumpers are set for an address other than
* this one (the default), change the following line to the
* proper address.
*/
#ifndef CDU535_ADDRESS
# define CDU535_ADDRESS 0x340
#endif
#ifndef CDU535_INTERRUPT
# define CDU535_INTERRUPT 0
#endif
#ifndef CDU535_HANDLE
# define CDU535_HANDLE "cdu535"
#endif
#ifndef CDU535_MESSAGE_NAME
# define CDU535_MESSAGE_NAME "Sony CDU-535"
#endif
#define CDU535_BLOCK_SIZE 2048
#ifndef MAX_SPINUP_RETRY
# define MAX_SPINUP_RETRY 3 /* 1 is sufficient for most drives... */
#endif
#ifndef RETRY_FOR_BAD_STATUS
# define RETRY_FOR_BAD_STATUS 100 /* in 10th of second */
#endif
#ifndef DEBUG
# define DEBUG 1
#endif
/*
* SONY535_BUFFER_SIZE determines the size of internal buffer used
* by the drive. It must be at least 2K and the larger the buffer
* the better the transfer rate. It does however take system memory.
* On my system I get the following transfer rates using dd to read
* 10 Mb off /dev/cdrom.
*
* 8K buffer 43 Kb/sec
* 16K buffer 66 Kb/sec
* 32K buffer 91 Kb/sec
* 64K buffer 111 Kb/sec
* 128K buffer 123 Kb/sec
* 512K buffer 123 Kb/sec
*/
#define SONY535_BUFFER_SIZE (64*1024)
/*
* if LOCK_DOORS is defined then the eject button is disabled while
* the device is open.
*/
#ifndef NO_LOCK_DOORS
# define LOCK_DOORS
#endif
static int read_subcode(void);
static void sony_get_toc(void);
static int cdu_open(struct inode *inode, struct file *filp);
static inline unsigned int int_to_bcd(unsigned int val);
static unsigned int bcd_to_int(unsigned int bcd);
static int do_sony_cmd(Byte * cmd, int nCmd, Byte status[2],
Byte * response, int n_response, int ignoreStatusBit7);
/* The base I/O address of the Sony Interface. This is a variable (not a
#define) so it can be easily changed via some future ioctl() */
static unsigned int sony535_cd_base_io = CDU535_ADDRESS;
module_param(sony535_cd_base_io, int, 0);
/*
* The following are I/O addresses of the various registers for the drive. The
* comment for the base address also applies here.
*/
static unsigned short select_unit_reg;
static unsigned short result_reg;
static unsigned short command_reg;
static unsigned short read_status_reg;
static unsigned short data_reg;
static DEFINE_SPINLOCK(sonycd535_lock); /* queue lock */
static struct request_queue *sonycd535_queue;
static int initialized; /* Has the drive been initialized? */
static int sony_disc_changed = 1; /* Has the disk been changed
since the last check? */
static int sony_toc_read; /* Has the table of contents been
read? */
static unsigned int sony_buffer_size; /* Size in bytes of the read-ahead
buffer. */
static unsigned int sony_buffer_sectors; /* Size (in 2048 byte records) of
the read-ahead buffer. */
static unsigned int sony_usage; /* How many processes have the
drive open. */
static int sony_first_block = -1; /* First OS block (512 byte) in
the read-ahead buffer */
static int sony_last_block = -1; /* Last OS block (512 byte) in
the read-ahead buffer */
static struct s535_sony_toc *sony_toc; /* Points to the table of
contents. */
static struct s535_sony_subcode *last_sony_subcode; /* Points to the last
subcode address read */
static Byte **sony_buffer; /* Points to the pointers
to the sector buffers */
static int sony_inuse; /* is the drive in use? Only one
open at a time allowed */
/*
* The audio status uses the values from read subchannel data as specified
* in include/linux/cdrom.h.
*/
static int sony_audio_status = CDROM_AUDIO_NO_STATUS;
/*
* The following are a hack for pausing and resuming audio play. The drive
* does not work as I would expect it, if you stop it then start it again,
* the drive seeks back to the beginning and starts over. This holds the
* position during a pause so a resume can restart it. It uses the
* audio status variable above to tell if it is paused.
* I just kept the CDU-31A driver behavior rather than using the PAUSE
* command on the CDU-535.
*/
static Byte cur_pos_msf[3];
static Byte final_pos_msf[3];
/* What IRQ is the drive using? 0 if none. */
static int sony535_irq_used = CDU535_INTERRUPT;
/* The interrupt handler will wake this queue up when it gets an interrupt. */
static DECLARE_WAIT_QUEUE_HEAD(cdu535_irq_wait);
/*
* This routine returns 1 if the disk has been changed since the last
* check or 0 if it hasn't. Setting flag to 0 resets the changed flag.
*/
static int
cdu535_check_media_change(struct gendisk *disk)
{
/* if driver is not initialized, always return 0 */
int retval = initialized ? sony_disc_changed : 0;
sony_disc_changed = 0;
return retval;
}
static inline void
enable_interrupts(void)
{
#ifdef USE_IRQ
/*
* This code was taken from cdu31a.c; it will not
* directly work for the cdu535 as written...
*/
curr_control_reg |= ( SONY_ATTN_INT_EN_BIT
| SONY_RES_RDY_INT_EN_BIT
| SONY_DATA_RDY_INT_EN_BIT);
outb(curr_control_reg, sony_cd_control_reg);
#endif
}
static inline void
disable_interrupts(void)
{
#ifdef USE_IRQ
/*
* This code was taken from cdu31a.c; it will not
* directly work for the cdu535 as written...
*/
curr_control_reg &= ~(SONY_ATTN_INT_EN_BIT
| SONY_RES_RDY_INT_EN_BIT
| SONY_DATA_RDY_INT_EN_BIT);
outb(curr_control_reg, sony_cd_control_reg);
#endif
}
static irqreturn_t
cdu535_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
disable_interrupts();
if (waitqueue_active(&cdu535_irq_wait)) {
wake_up(&cdu535_irq_wait);
return IRQ_HANDLED;
}
printk(CDU535_MESSAGE_NAME
": Got an interrupt but nothing was waiting\n");
return IRQ_NONE;
}
/*
* Wait a little while.
*/
static inline void
sony_sleep(void)
{
if (sony535_irq_used <= 0) { /* poll */
yield();
} else { /* Interrupt driven */
DEFINE_WAIT(wait);
spin_lock_irq(&sonycd535_lock);
enable_interrupts();
prepare_to_wait(&cdu535_irq_wait, &wait, TASK_INTERRUPTIBLE);
spin_unlock_irq(&sonycd535_lock);
schedule();
finish_wait(&cdu535_irq_wait, &wait);
}
}
/*------------------start of SONY CDU535 very specific ---------------------*/
/****************************************************************************
* void select_unit( int unit_no )
*
* Select the specified unit (0-3) so that subsequent commands reference it
****************************************************************************/
static void
select_unit(int unit_no)
{
unsigned int select_mask = ~(1 << unit_no);
outb(select_mask, select_unit_reg);
}
/***************************************************************************
* int read_result_reg( Byte *data_ptr )
*
* Read a result byte from the Sony CDU controller, store in location pointed
* to by data_ptr. Return zero on success, TIME_OUT if we did not receive
* data.
***************************************************************************/
static int
read_result_reg(Byte *data_ptr)
{
unsigned long snap;
int read_status;
snap = jiffies;
while (jiffies-snap < SONY_JIFFIES_TIMEOUT) {
read_status = inb(read_status_reg);
if ((read_status & SONY535_RESULT_NOT_READY_BIT) == 0) {
#if DEBUG > 1
printk(CDU535_MESSAGE_NAME
": read_result_reg(): readStatReg = 0x%x\n", read_status);
#endif
*data_ptr = inb(result_reg);
return 0;
} else {
sony_sleep();
}
}
printk(CDU535_MESSAGE_NAME " read_result_reg: TIME OUT!\n");
return TIME_OUT;
}
/****************************************************************************
* int read_exec_status( Byte status[2] )
*
* Read the execution status of the last command and put into status.
* Handles reading second status word if available. Returns 0 on success,
* TIME_OUT on failure.
****************************************************************************/
static int
read_exec_status(Byte status[2])
{
status[1] = 0;
if (read_result_reg(&(status[0])) != 0)
return TIME_OUT;
if ((status[0] & 0x80) != 0) { /* byte two follows */
if (read_result_reg(&(status[1])) != 0)
return TIME_OUT;
}
#if DEBUG > 1
printk(CDU535_MESSAGE_NAME ": read_exec_status: read 0x%x 0x%x\n",
status[0], status[1]);
#endif
return 0;
}
/****************************************************************************
* int check_drive_status( void )
*
* Check the current drive status. Using this before executing a command
* takes care of the problem of unsolicited drive status-2 messages.
* Add a check of the audio status if we think the disk is playing.
****************************************************************************/
static int
check_drive_status(void)
{
Byte status, e_status[2];
int CDD, ATN;
Byte cmd;
select_unit(0);
if (sony_audio_status == CDROM_AUDIO_PLAY) { /* check status */
outb(SONY535_REQUEST_AUDIO_STATUS, command_reg);
if (read_result_reg(&status) == 0) {
switch (status) {
case 0x0:
break; /* play in progress */
case 0x1:
break; /* paused */
case 0x3: /* audio play completed */
case 0x5: /* play not requested */
sony_audio_status = CDROM_AUDIO_COMPLETED;
read_subcode();
break;
case 0x4: /* error during play */
sony_audio_status = CDROM_AUDIO_ERROR;
break;
}
}
}
/* now check drive status */
outb(SONY535_REQUEST_DRIVE_STATUS_2, command_reg);
if (read_result_reg(&status) != 0)
return TIME_OUT;
#if DEBUG > 1
printk(CDU535_MESSAGE_NAME ": check_drive_status() got 0x%x\n", status);
#endif
if (status == 0)
return 0;
ATN = status & 0xf;
CDD = (status >> 4) & 0xf;
switch (ATN) {
case 0x0:
break; /* go on to CDD stuff */
case SONY535_ATN_BUSY:
if (initialized)
printk(CDU535_MESSAGE_NAME " error: drive busy\n");
return CD_BUSY;
case SONY535_ATN_EJECT_IN_PROGRESS:
printk(CDU535_MESSAGE_NAME " error: eject in progress\n");
sony_audio_status = CDROM_AUDIO_INVALID;
return CD_BUSY;
case SONY535_ATN_RESET_OCCURRED:
case SONY535_ATN_DISC_CHANGED:
case SONY535_ATN_RESET_AND_DISC_CHANGED:
#if DEBUG > 0
printk(CDU535_MESSAGE_NAME " notice: reset occurred or disc changed\n");
#endif
sony_disc_changed = 1;
sony_toc_read = 0;
sony_audio_status = CDROM_AUDIO_NO_STATUS;
sony_first_block = -1;
sony_last_block = -1;
if (initialized) {
cmd = SONY535_SPIN_UP;
do_sony_cmd(&cmd, 1, e_status, NULL, 0, 0);
sony_get_toc();
}
return 0;
default:
printk(CDU535_MESSAGE_NAME " error: drive busy (ATN=0x%x)\n", ATN);
return CD_BUSY;
}
switch (CDD) { /* the 531 docs are not helpful in decoding this */
case 0x0: /* just use the values from the DOS driver */
case 0x2:
case 0xa:
break; /* no error */
case 0xc:
printk(CDU535_MESSAGE_NAME
": check_drive_status(): CDD = 0xc! Not properly handled!\n");
return CD_BUSY; /* ? */
default:
return CD_BUSY;
}
return 0;
} /* check_drive_status() */
/*****************************************************************************
* int do_sony_cmd( Byte *cmd, int n_cmd, Byte status[2],
* Byte *response, int n_response, int ignore_status_bit7 )
*
* Generic routine for executing commands. The command and its parameters
* should be placed in the cmd[] array, number of bytes in the command is
* stored in nCmd. The response from the command will be stored in the
* response array. The number of bytes you expect back (excluding status)
* should be passed in n_response. Finally, some
* commands set bit 7 of the return status even when there is no second
* status byte, on these commands set ignoreStatusBit7 TRUE.
* If the command was sent and data received back, then we return 0,
* else we return TIME_OUT. You still have to check the status yourself.
* You should call check_drive_status() before calling this routine
* so that you do not lose notifications of disk changes, etc.
****************************************************************************/
static int
do_sony_cmd(Byte * cmd, int n_cmd, Byte status[2],
Byte * response, int n_response, int ignore_status_bit7)
{
int i;
/* write out the command */
for (i = 0; i < n_cmd; i++)
outb(cmd[i], command_reg);
/* read back the status */
if (read_result_reg(status) != 0)
return TIME_OUT;
if (!ignore_status_bit7 && ((status[0] & 0x80) != 0)) {
/* get second status byte */
if (read_result_reg(status + 1) != 0)
return TIME_OUT;
} else {
status[1] = 0;
}
#if DEBUG > 2
printk(CDU535_MESSAGE_NAME ": do_sony_cmd %x: %x %x\n",
*cmd, status[0], status[1]);
#endif
/* do not know about when I should read set of data and when not to */
if ((status[0] & ((ignore_status_bit7 ? 0x7f : 0xff) & 0x8f)) != 0)
return 0;
/* else, read in rest of data */
for (i = 0; 0 < n_response; n_response--, i++)
if (read_result_reg(response + i) != 0)
return TIME_OUT;
return 0;
} /* do_sony_cmd() */
/**************************************************************************
* int set_drive_mode( int mode, Byte status[2] )
*
* Set the drive mode to the specified value (mode=0 is audio, mode=e0
* is mode-1 CDROM
**************************************************************************/
static int
set_drive_mode(int mode, Byte status[2])
{
Byte cmd_buff[2];
Byte ret_buff[1];
cmd_buff[0] = SONY535_SET_DRIVE_MODE;
cmd_buff[1] = mode;
return do_sony_cmd(cmd_buff, 2, status, ret_buff, 1, 1);
}
/***************************************************************************
* int seek_and_read_N_blocks( Byte params[], int n_blocks, Byte status[2],
* Byte *data_buff, int buff_size )
*
* Read n_blocks of data from the CDROM starting at position params[0:2],
* number of blocks in stored in params[3:5] -- both these are already
* int bcd format.
* Transfer the data into the buffer pointed at by data_buff. buff_size
* gives the number of bytes available in the buffer.
* The routine returns number of bytes read in if successful, otherwise
* it returns one of the standard error returns.
***************************************************************************/
static int
seek_and_read_N_blocks(Byte params[], int n_blocks, Byte status[2],
Byte **buff, int buf_size)
{
Byte cmd_buff[7];
int i;
int read_status;
unsigned long snap;
Byte *data_buff;
int sector_count = 0;
if (buf_size < CDU535_BLOCK_SIZE * n_blocks)
return NO_ROOM;
set_drive_mode(SONY535_CDROM_DRIVE_MODE, status);
/* send command to read the data */
cmd_buff[0] = SONY535_SEEK_AND_READ_N_BLOCKS_1;
for (i = 0; i < 6; i++)
cmd_buff[i + 1] = params[i];
for (i = 0; i < 7; i++)
outb(cmd_buff[i], command_reg);
/* read back the data one block at a time */
while (0 < n_blocks--) {
/* wait for data to be ready */
int data_valid = 0;
snap = jiffies;
while (jiffies-snap < SONY_JIFFIES_TIMEOUT) {
read_status = inb(read_status_reg);
if ((read_status & SONY535_RESULT_NOT_READY_BIT) == 0) {
read_exec_status(status);
return BAD_STATUS;
}
if ((read_status & SONY535_DATA_NOT_READY_BIT) == 0) {
/* data is ready, read it */
data_buff = buff[sector_count++];
for (i = 0; i < CDU535_BLOCK_SIZE; i++)
*data_buff++ = inb(data_reg); /* unrolling this loop does not seem to help */
data_valid = 1;
break; /* exit the timeout loop */
}
sony_sleep(); /* data not ready, sleep a while */
}
if (!data_valid)
return TIME_OUT; /* if we reach this stage */
}
/* read all the data, now read the status */
if ((i = read_exec_status(status)) != 0)
return i;
return CDU535_BLOCK_SIZE * sector_count;
} /* seek_and_read_N_blocks() */
/****************************************************************************
* int request_toc_data( Byte status[2], struct s535_sony_toc *toc )
*
* Read in the table of contents data. Converts all the bcd data
* into integers in the toc structure.
****************************************************************************/
static int
request_toc_data(Byte status[2], struct s535_sony_toc *toc)
{
int to_status;
int i, j, n_tracks, track_no;
int first_track_num, last_track_num;
Byte cmd_no = 0xb2;
Byte track_address_buffer[5];
/* read the fixed portion of the table of contents */
if ((to_status = do_sony_cmd(&cmd_no, 1, status, (Byte *) toc, 15, 1)) != 0)
return to_status;
/* convert the data into integers so we can use them */
first_track_num = bcd_to_int(toc->first_track_num);
last_track_num = bcd_to_int(toc->last_track_num);
n_tracks = last_track_num - first_track_num + 1;
/* read each of the track address descriptors */
for (i = 0; i < n_tracks; i++) {
/* read the descriptor into a temporary buffer */
for (j = 0; j < 5; j++) {
if (read_result_reg(track_address_buffer + j) != 0)
return TIME_OUT;
if (j == 1) /* need to convert from bcd */
track_no = bcd_to_int(track_address_buffer[j]);
}
/* copy the descriptor to proper location - sonycd.c just fills */
memcpy(toc->tracks + i, track_address_buffer, 5);
}
return 0;
} /* request_toc_data() */
/***************************************************************************
* int spin_up_drive( Byte status[2] )
*
* Spin up the drive (unless it is already spinning).
***************************************************************************/
static int
spin_up_drive(Byte status[2])
{
Byte cmd;
/* first see if the drive is already spinning */
cmd = SONY535_REQUEST_DRIVE_STATUS_1;
if (do_sony_cmd(&cmd, 1, status, NULL, 0, 0) != 0)
return TIME_OUT;
if ((status[0] & SONY535_STATUS1_NOT_SPINNING) == 0)
return 0; /* it's already spinning */
/* otherwise, give the spin-up command */
cmd = SONY535_SPIN_UP;
return do_sony_cmd(&cmd, 1, status, NULL, 0, 0);
}
/*--------------------end of SONY CDU535 very specific ---------------------*/
/* Convert from an integer 0-99 to BCD */
static inline unsigned int
int_to_bcd(unsigned int val)
{
int retval;
retval = (val / 10) << 4;
retval = retval | val % 10;
return retval;
}
/* Convert from BCD to an integer from 0-99 */
static unsigned int
bcd_to_int(unsigned int bcd)
{
return (((bcd >> 4) & 0x0f) * 10) + (bcd & 0x0f);
}
/*
* Convert a logical sector value (like the OS would want to use for
* a block device) to an MSF format.
*/
static void
log_to_msf(unsigned int log, Byte *msf)
{
log = log + LOG_START_OFFSET;
msf[0] = int_to_bcd(log / 4500);
log = log % 4500;
msf[1] = int_to_bcd(log / 75);
msf[2] = int_to_bcd(log % 75);
}
/*
* Convert an MSF format to a logical sector.
*/
static unsigned int
msf_to_log(Byte *msf)
{
unsigned int log;
log = bcd_to_int(msf[2]);
log += bcd_to_int(msf[1]) * 75;
log += bcd_to_int(msf[0]) * 4500;
log = log - LOG_START_OFFSET;
return log;
}
/*
* Take in integer size value and put it into a buffer like
* the drive would want to see a number-of-sector value.
*/
static void
size_to_buf(unsigned int size, Byte *buf)
{
buf[0] = size / 65536;
size = size % 65536;
buf[1] = size / 256;
buf[2] = size % 256;
}
/*
* The OS calls this to perform a read or write operation to the drive.
* Write obviously fail. Reads to a read ahead of sony_buffer_size
* bytes to help speed operations. This especially helps since the OS
* may use 1024 byte blocks and the drive uses 2048 byte blocks. Since most
* data access on a CD is done sequentially, this saves a lot of operations.
*/
static void
do_cdu535_request(request_queue_t * q)
{
struct request *req;
unsigned int read_size;
int block;
int nsect;
int copyoff;
int spin_up_retry;
Byte params[10];
Byte status[2];
Byte cmd[2];
while (1) {
req = elv_next_request(q);
if (!req)
return;
block = req->sector;
nsect = req->nr_sectors;
if (!blk_fs_request(req)) {
end_request(req, 0);
continue;
}
if (rq_data_dir(req) == WRITE) {
end_request(req, 0);
continue;
}
/*
* If the block address is invalid or the request goes beyond
* the end of the media, return an error.
*/
if (sony_toc->lead_out_start_lba <= (block/4)) {
end_request(req, 0);
return;
}
if (sony_toc->lead_out_start_lba <= ((block + nsect) / 4)) {
end_request(req, 0);
return;
}
while (0 < nsect) {
/*
* If the requested sector is not currently in
* the read-ahead buffer, it must be read in.
*/
if ((block < sony_first_block) || (sony_last_block < block)) {
sony_first_block = (block / 4) * 4;
log_to_msf(block / 4, params);
/*
* If the full read-ahead would go beyond the end of the media, trim
* it back to read just till the end of the media.
*/
if (sony_toc->lead_out_start_lba <= ((block / 4) + sony_buffer_sectors)) {
sony_last_block = (sony_toc->lead_out_start_lba * 4) - 1;
read_size = sony_toc->lead_out_start_lba - (block / 4);
} else {
sony_last_block = sony_first_block + (sony_buffer_sectors * 4) - 1;
read_size = sony_buffer_sectors;
}
size_to_buf(read_size, ¶ms[3]);
/*
* Read the data. If the drive was not spinning,
* spin it up and try some more.
*/
for (spin_up_retry=0 ;; ++spin_up_retry) {
/* This loop has been modified to support the Sony
* CDU-510/515 series, thanks to Claudio Porfiri
* <[email protected]>.
*/
/*
* This part is to deal with very slow hardware. We
* try at most MAX_SPINUP_RETRY times to read the same
* block. A check for seek_and_read_N_blocks' result is
* performed; if the result is wrong, the CDROM's engine
* is restarted and the operation is tried again.
*/
/*
* 1995-06-01: The system got problems when downloading
* from Slackware CDROM, the problem seems to be:
* seek_and_read_N_blocks returns BAD_STATUS and we
* should wait for a while before retrying, so a new
* part was added to discriminate the return value from
* seek_and_read_N_blocks for the various cases.
*/
int readStatus = seek_and_read_N_blocks(params, read_size,
status, sony_buffer, (read_size * CDU535_BLOCK_SIZE));
if (0 <= readStatus) /* Good data; common case, placed first */
break;
if (readStatus == NO_ROOM || spin_up_retry == MAX_SPINUP_RETRY) {
/* give up */
if (readStatus == NO_ROOM)
printk(CDU535_MESSAGE_NAME " No room to read from CD\n");
else
printk(CDU535_MESSAGE_NAME " Read error: 0x%.2x\n",
status[0]);
sony_first_block = -1;
sony_last_block = -1;
end_request(req, 0);
return;
}
if (readStatus == BAD_STATUS) {
/* Sleep for a while, then retry */
set_current_state(TASK_INTERRUPTIBLE);
spin_unlock_irq(&sonycd535_lock);
schedule_timeout(RETRY_FOR_BAD_STATUS*HZ/10);
spin_lock_irq(&sonycd535_lock);
}
#if DEBUG > 0
printk(CDU535_MESSAGE_NAME
" debug: calling spin up when reading data!\n");
#endif
cmd[0] = SONY535_SPIN_UP;
do_sony_cmd(cmd, 1, status, NULL, 0, 0);
}
}
/*
* The data is in memory now, copy it to the buffer and advance to the
* next block to read.
*/
copyoff = block - sony_first_block;
memcpy(req->buffer,
sony_buffer[copyoff / 4] + 512 * (copyoff % 4), 512);
block += 1;
nsect -= 1;
req->buffer += 512;
}
end_request(req, 1);
}
}
/*
* Read the table of contents from the drive and set sony_toc_read if
* successful.
*/
static void
sony_get_toc(void)
{
Byte status[2];
if (!sony_toc_read) {
/* do not call check_drive_status() from here since it can call this routine */
if (request_toc_data(status, sony_toc) < 0)
return;
sony_toc->lead_out_start_lba = msf_to_log(sony_toc->lead_out_start_msf);
sony_toc_read = 1;
}
}
/*
* Search for a specific track in the table of contents. track is
* passed in bcd format
*/
static int
find_track(int track)
{
int i;
int num_tracks;
num_tracks = bcd_to_int(sony_toc->last_track_num) -
bcd_to_int(sony_toc->first_track_num) + 1;
for (i = 0; i < num_tracks; i++) {
if (sony_toc->tracks[i].track == track) {
return i;
}
}
return -1;
}
/*
* Read the subcode and put it int last_sony_subcode for future use.
*/
static int
read_subcode(void)
{
Byte cmd = SONY535_REQUEST_SUB_Q_DATA;
Byte status[2];
int dsc_status;
if (check_drive_status() != 0)
return -EIO;
if ((dsc_status = do_sony_cmd(&cmd, 1, status, (Byte *) last_sony_subcode,
sizeof(struct s535_sony_subcode), 1)) != 0) {
printk(CDU535_MESSAGE_NAME " error 0x%.2x, %d (read_subcode)\n",
status[0], dsc_status);
return -EIO;
}
return 0;
}
/*
* Get the subchannel info like the CDROMSUBCHNL command wants to see it. If
* the drive is playing, the subchannel needs to be read (since it would be
* changing). If the drive is paused or completed, the subcode information has
* already been stored, just use that. The ioctl call wants things in decimal
* (not BCD), so all the conversions are done.
*/
static int
sony_get_subchnl_info(void __user *arg)