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cdu31a.c
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/*
* Sony CDU-31A CDROM interface device driver.
*
* Corey Minyard (minyard@wf-rch.cirr.com)
*
* Colossians 3:17
*
* See Documentation/cdrom/cdu31a for additional details about this driver.
*
* 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.
*
* WARNING - All autoprobes have been removed from the driver.
* You MUST configure the CDU31A via a LILO config
* at boot time or in lilo.conf. I have the
* following in my lilo.conf:
*
* append="cdu31a=0x1f88,0,PAS"
*
* The first number is the I/O base address of the
* card. The second is the interrupt (0 means none).
* The third should be "PAS" if on a Pro-Audio
* spectrum, or nothing if on something else.
*
* 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 lot of
* the following:
*
* retry_count = jiffies+ SONY_JIFFIES_TIMEOUT;
* while (time_before(jiffies, retry_count) && (! <some condition to wait for))
* {
* while (handle_sony_cd_attention())
* ;
*
* sony_sleep();
* }
* if (the condition not met)
* {
* return an error;
* }
*
* This ugly hack waits for something to happen, sleeping a little
* between every try. it also handles attentions, which are
* asynchronous events from the drive informing the driver that a disk
* has been inserted, removed, etc.
*
* NEWS FLASH - The driver now supports interrupts but they are
* turned off by default. Use of interrupts is highly encouraged, it
* cuts CPU usage down to a reasonable level. I had DMA in for a while
* but PC DMA is just too slow. Better to just insb() it.
*
* 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.
*
* DRIVER SPECIAL FEATURES
* -----------------------
*
* This section describes features beyond the normal audio and CD-ROM
* functions of the drive.
*
* XA compatibility
*
* The driver should support XA disks for both the CDU31A and CDU33A.
* It does this transparently, the using program doesn't need to set it.
*
* Multi-Session
*
* A multi-session disk looks just like a normal disk to the user.
* Just mount one normally, and all the data should be there.
* A special thanks to Koen for help with this!
*
* Raw sector I/O
*
* Using the CDROMREADAUDIO it is possible to read raw audio and data
* tracks. Both operations return 2352 bytes per sector. On the data
* tracks, the first 12 bytes is not returned by the drive and the value
* of that data is indeterminate.
*
*
* 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.
*
* TODO:
* CDs with form1 and form2 sectors cause problems
* with current read-ahead strategy.
*
* Credits:
* Heiko Eissfeldt <heiko@colossus.escape.de>
* For finding abug in the return of the track numbers.
* TOC processing redone for proper multisession support.
*
*
* It probably a little late to be adding a history, but I guess I
* will start.
*
* 10/24/95 - Added support for disabling the eject button when the
* drive is open. Note that there is a small problem
* still here, if the eject button is pushed while the
* drive light is flashing, the drive will return a bad
* status and be reset. It recovers, though.
*
* 03/07/97 - Fixed a problem with timers.
*
*
* 18 Spetember 1997 -- Ported to Uniform CD-ROM driver by
* Heiko Eissfeldt <heiko@colossus.escape.de> with additional
* changes by Erik Andersen <andersee@debian.org>
*
* 24 January 1998 -- Removed the scd_disc_status() function, which was now
* just dead code left over from the port.
* Erik Andersen <andersee@debian.org>
*
* 16 July 1998 -- Drive donated to Erik Andersen by John Kodis
* <kodis@jagunet.com>. Work begun on fixing driver to
* work under 2.1.X. Added temporary extra printks
* which seem to slow it down enough to work.
*
* 9 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 <tmm@image.dk>
*
* 22 October 2004 -- Make the driver work in 2.6.X
* Added workaround to fix hard lockups on eject
* Fixed door locking problem after mounting empty drive
* Set double-speed drives to double speed by default
* Removed all readahead things - not needed anymore
* Ondrej Zary <rainbow@rainbow-software.org>
*/
#define DEBUG 1
#include <linux/major.h>
#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/hdreg.h>
#include <linux/genhd.h>
#include <linux/ioport.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/cdrom.h>
#include <asm/system.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/dma.h>
#include "cdu31a.h"
#define MAJOR_NR CDU31A_CDROM_MAJOR
#include <linux/blkdev.h>
#define CDU31A_MAX_CONSECUTIVE_ATTENTIONS 10
#define PFX "CDU31A: "
/*
** Edit the following data to change interrupts, DMA channels, etc.
** Default is polled and no DMA. DMA is not recommended for double-speed
** drives.
*/
static struct {
unsigned short base; /* I/O Base Address */
short int_num; /* Interrupt Number (-1 means scan for it,
0 means don't use) */
} cdu31a_addresses[] __initdata = {
{0}
};
static int handle_sony_cd_attention(void);
static int read_subcode(void);
static void sony_get_toc(void);
static int scd_spinup(void);
/*static int scd_open(struct inode *inode, struct file *filp);*/
static int scd_open(struct cdrom_device_info *, int);
static void do_sony_cd_cmd(unsigned char cmd,
unsigned char *params,
unsigned int num_params,
unsigned char *result_buffer,
unsigned int *result_size);
static void size_to_buf(unsigned int size, unsigned char *buf);
/* Parameters for the read-ahead. */
static unsigned int sony_next_block; /* Next 512 byte block offset */
static unsigned int sony_blocks_left = 0; /* Number of 512 byte blocks left
in the current read command. */
/* 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 cdu31a_port = 0;
module_param(cdu31a_port, uint, 0);
/*
* The following are I/O addresses of the various registers for the drive. The
* comment for the base address also applies here.
*/
static volatile unsigned short sony_cd_cmd_reg;
static volatile unsigned short sony_cd_param_reg;
static volatile unsigned short sony_cd_write_reg;
static volatile unsigned short sony_cd_control_reg;
static volatile unsigned short sony_cd_status_reg;
static volatile unsigned short sony_cd_result_reg;
static volatile unsigned short sony_cd_read_reg;
static volatile unsigned short sony_cd_fifost_reg;
static struct request_queue *cdu31a_queue;
static DEFINE_SPINLOCK(cdu31a_lock); /* queue lock */
static int sony_spun_up = 0; /* Has the drive been spun up? */
static int sony_speed = 0; /* Last wanted speed */
static int sony_xa_mode = 0; /* Is an XA disk in the drive
and the drive a CDU31A? */
static int sony_raw_data_mode = 1; /* 1 if data tracks, 0 if audio.
For raw data reads. */
static unsigned int sony_usage = 0; /* How many processes have the
drive open. */
static int sony_pas_init = 0; /* Initialize the Pro-Audio
Spectrum card? */
static struct s_sony_session_toc single_toc; /* Holds the
table of
contents. */
static struct s_all_sessions_toc sony_toc; /* entries gathered from all
sessions */
static int sony_toc_read = 0; /* Has the TOC been read for
the drive? */
static struct s_sony_subcode last_sony_subcode; /* Points to the last
subcode address read */
static DECLARE_MUTEX(sony_sem); /* Semaphore for drive hardware access */
static int is_double_speed = 0; /* does the drive support double speed ? */
static int is_auto_eject = 1; /* Door has been locked? 1=No/0=Yes */
/*
* The audio status uses the values from read subchannel data as specified
* in include/linux/cdrom.h.
*/
static volatile 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.
*/
static unsigned volatile char cur_pos_msf[3] = { 0, 0, 0 };
static unsigned volatile char final_pos_msf[3] = { 0, 0, 0 };
/* What IRQ is the drive using? 0 if none. */
static int cdu31a_irq = 0;
module_param(cdu31a_irq, int, 0);
/* The interrupt handler will wake this queue up when it gets an
interrupts. */
static DECLARE_WAIT_QUEUE_HEAD(cdu31a_irq_wait);
static int irq_flag = 0;
static int curr_control_reg = 0; /* Current value of the control register */
/* A disk changed variable. When a disk change is detected, it will
all be set to TRUE. As the upper layers ask for disk_changed status
it will be cleared. */
static char disk_changed;
/* This was readahead_buffer once... Now it's used only for audio reads */
static char audio_buffer[CD_FRAMESIZE_RAW];
/* Used to time a short period to abort an operation after the
drive has been idle for a while. This keeps the light on
the drive from flashing for very long. */
static struct timer_list cdu31a_abort_timer;
/* Marks if the timeout has started an abort read. This is used
on entry to the drive to tell the code to read out the status
from the abort read. */
static int abort_read_started = 0;
/*
* Uniform cdrom interface function
* report back, if disc has changed from time of last request.
*/
static int scd_media_changed(struct cdrom_device_info *cdi, int disc_nr)
{
int retval;
retval = disk_changed;
disk_changed = 0;
return retval;
}
/*
* Uniform cdrom interface function
* report back, if drive is ready
*/
static int scd_drive_status(struct cdrom_device_info *cdi, int slot_nr)
{
if (CDSL_CURRENT != slot_nr)
/* we have no changer support */
return -EINVAL;
if (sony_spun_up)
return CDS_DISC_OK;
if (down_interruptible(&sony_sem))
return -ERESTARTSYS;
if (scd_spinup() == 0)
sony_spun_up = 1;
up(&sony_sem);
return sony_spun_up ? CDS_DISC_OK : CDS_DRIVE_NOT_READY;
}
static inline void enable_interrupts(void)
{
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);
}
static inline void disable_interrupts(void)
{
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);
}
/*
* Wait a little while (used for polling the drive). If in initialization,
* setting a timeout doesn't work, so just loop for a while.
*/
static inline void sony_sleep(void)
{
if (cdu31a_irq <= 0) {
yield();
} else { /* Interrupt driven */
DEFINE_WAIT(w);
int first = 1;
while (1) {
prepare_to_wait(&cdu31a_irq_wait, &w,
TASK_INTERRUPTIBLE);
if (first) {
enable_interrupts();
first = 0;
}
if (irq_flag != 0)
break;
if (!signal_pending(current)) {
schedule();
continue;
} else
disable_interrupts();
break;
}
finish_wait(&cdu31a_irq_wait, &w);
irq_flag = 0;
}
}
/*
* The following are convenience routine to read various status and set
* various conditions in the drive.
*/
static inline int is_attention(void)
{
return (inb(sony_cd_status_reg) & SONY_ATTN_BIT) != 0;
}
static inline int is_busy(void)
{
return (inb(sony_cd_status_reg) & SONY_BUSY_BIT) != 0;
}
static inline int is_data_ready(void)
{
return (inb(sony_cd_status_reg) & SONY_DATA_RDY_BIT) != 0;
}
static inline int is_data_requested(void)
{
return (inb(sony_cd_status_reg) & SONY_DATA_REQUEST_BIT) != 0;
}
static inline int is_result_ready(void)
{
return (inb(sony_cd_status_reg) & SONY_RES_RDY_BIT) != 0;
}
static inline int is_param_write_rdy(void)
{
return (inb(sony_cd_fifost_reg) & SONY_PARAM_WRITE_RDY_BIT) != 0;
}
static inline int is_result_reg_not_empty(void)
{
return (inb(sony_cd_fifost_reg) & SONY_RES_REG_NOT_EMP_BIT) != 0;
}
static inline void reset_drive(void)
{
curr_control_reg = 0;
sony_toc_read = 0;
outb(SONY_DRIVE_RESET_BIT, sony_cd_control_reg);
}
/*
* Uniform cdrom interface function
* reset drive and return when it is ready
*/
static int scd_reset(struct cdrom_device_info *cdi)
{
unsigned long retry_count;
if (down_interruptible(&sony_sem))
return -ERESTARTSYS;
reset_drive();
retry_count = jiffies + SONY_RESET_TIMEOUT;
while (time_before(jiffies, retry_count) && (!is_attention())) {
sony_sleep();
}
up(&sony_sem);
return 0;
}
static inline void clear_attention(void)
{
outb(curr_control_reg | SONY_ATTN_CLR_BIT, sony_cd_control_reg);
}
static inline void clear_result_ready(void)
{
outb(curr_control_reg | SONY_RES_RDY_CLR_BIT, sony_cd_control_reg);
}
static inline void clear_data_ready(void)
{
outb(curr_control_reg | SONY_DATA_RDY_CLR_BIT,
sony_cd_control_reg);
}
static inline void clear_param_reg(void)
{
outb(curr_control_reg | SONY_PARAM_CLR_BIT, sony_cd_control_reg);
}
static inline unsigned char read_status_register(void)
{
return inb(sony_cd_status_reg);
}
static inline unsigned char read_result_register(void)
{
return inb(sony_cd_result_reg);
}
static inline unsigned char read_data_register(void)
{
return inb(sony_cd_read_reg);
}
static inline void write_param(unsigned char param)
{
outb(param, sony_cd_param_reg);
}
static inline void write_cmd(unsigned char cmd)
{
outb(curr_control_reg | SONY_RES_RDY_INT_EN_BIT,
sony_cd_control_reg);
outb(cmd, sony_cd_cmd_reg);
}
static irqreturn_t cdu31a_interrupt(int irq, void *dev_id)
{
unsigned char val;
if (abort_read_started) {
/* We might be waiting for an abort to finish. Don't
disable interrupts yet, though, because we handle
this one here. */
/* Clear out the result registers. */
while (is_result_reg_not_empty()) {
val = read_result_register();
}
clear_data_ready();
clear_result_ready();
/* Clear out the data */
while (is_data_requested()) {
val = read_data_register();
}
abort_read_started = 0;
/* If something was waiting, wake it up now. */
if (waitqueue_active(&cdu31a_irq_wait)) {
disable_interrupts();
irq_flag = 1;
wake_up_interruptible(&cdu31a_irq_wait);
}
} else if (waitqueue_active(&cdu31a_irq_wait)) {
disable_interrupts();
irq_flag = 1;
wake_up_interruptible(&cdu31a_irq_wait);
} else {
disable_interrupts();
printk(KERN_NOTICE PFX
"Got an interrupt but nothing was waiting\n");
}
return IRQ_HANDLED;
}
/*
* give more verbose error messages
*/
static unsigned char *translate_error(unsigned char err_code)
{
static unsigned char errbuf[80];
switch (err_code) {
case 0x10: return "illegal command ";
case 0x11: return "illegal parameter ";
case 0x20: return "not loaded ";
case 0x21: return "no disc ";
case 0x22: return "not spinning ";
case 0x23: return "spinning ";
case 0x25: return "spindle servo ";
case 0x26: return "focus servo ";
case 0x29: return "eject mechanism ";
case 0x2a: return "audio playing ";
case 0x2c: return "emergency eject ";
case 0x30: return "focus ";
case 0x31: return "frame sync ";
case 0x32: return "subcode address ";
case 0x33: return "block sync ";
case 0x34: return "header address ";
case 0x40: return "illegal track read ";
case 0x41: return "mode 0 read ";
case 0x42: return "illegal mode read ";
case 0x43: return "illegal block size read ";
case 0x44: return "mode read ";
case 0x45: return "form read ";
case 0x46: return "leadout read ";
case 0x47: return "buffer overrun ";
case 0x53: return "unrecoverable CIRC ";
case 0x57: return "unrecoverable LECC ";
case 0x60: return "no TOC ";
case 0x61: return "invalid subcode data ";
case 0x63: return "focus on TOC read ";
case 0x64: return "frame sync on TOC read ";
case 0x65: return "TOC data ";
case 0x70: return "hardware failure ";
case 0x91: return "leadin ";
case 0x92: return "leadout ";
case 0x93: return "data track ";
}
sprintf(errbuf, "unknown 0x%02x ", err_code);
return errbuf;
}
/*
* Set the drive parameters so the drive will auto-spin-up when a
* disk is inserted.
*/
static void set_drive_params(int want_doublespeed)
{
unsigned char res_reg[12];
unsigned int res_size;
unsigned char params[3];
params[0] = SONY_SD_AUTO_SPIN_DOWN_TIME;
params[1] = 0x00; /* Never spin down the drive. */
do_sony_cd_cmd(SONY_SET_DRIVE_PARAM_CMD,
params, 2, res_reg, &res_size);
if ((res_size < 2) || ((res_reg[0] & 0xf0) == 0x20)) {
printk(KERN_NOTICE PFX
"Unable to set spin-down time: 0x%2.2x\n", res_reg[1]);
}
params[0] = SONY_SD_MECH_CONTROL;
params[1] = SONY_AUTO_SPIN_UP_BIT; /* Set auto spin up */
if (is_auto_eject)
params[1] |= SONY_AUTO_EJECT_BIT;
if (is_double_speed && want_doublespeed) {
params[1] |= SONY_DOUBLE_SPEED_BIT; /* Set the drive to double speed if
possible */
}
do_sony_cd_cmd(SONY_SET_DRIVE_PARAM_CMD,
params, 2, res_reg, &res_size);
if ((res_size < 2) || ((res_reg[0] & 0xf0) == 0x20)) {
printk(KERN_NOTICE PFX "Unable to set mechanical "
"parameters: 0x%2.2x\n", res_reg[1]);
}
}
/*
* Uniform cdrom interface function
* select reading speed for data access
*/
static int scd_select_speed(struct cdrom_device_info *cdi, int speed)
{
if (speed == 0)
sony_speed = 1;
else
sony_speed = speed - 1;
if (down_interruptible(&sony_sem))
return -ERESTARTSYS;
set_drive_params(sony_speed);
up(&sony_sem);
return 0;
}
/*
* Uniform cdrom interface function
* lock or unlock eject button
*/
static int scd_lock_door(struct cdrom_device_info *cdi, int lock)
{
if (lock == 0) {
is_auto_eject = 1;
} else {
is_auto_eject = 0;
}
if (down_interruptible(&sony_sem))
return -ERESTARTSYS;
set_drive_params(sony_speed);
up(&sony_sem);
return 0;
}
/*
* This code will reset the drive and attempt to restore sane parameters.
*/
static void restart_on_error(void)
{
unsigned char res_reg[12];
unsigned int res_size;
unsigned long retry_count;
printk(KERN_NOTICE PFX "Resetting drive on error\n");
reset_drive();
retry_count = jiffies + SONY_RESET_TIMEOUT;
while (time_before(jiffies, retry_count) && (!is_attention())) {
sony_sleep();
}
set_drive_params(sony_speed);
do_sony_cd_cmd(SONY_SPIN_UP_CMD, NULL, 0, res_reg, &res_size);
if ((res_size < 2) || ((res_reg[0] & 0xf0) == 0x20)) {
printk(KERN_NOTICE PFX "Unable to spin up drive: 0x%2.2x\n",
res_reg[1]);
}
msleep(2000);
sony_get_toc();
}
/*
* This routine writes data to the parameter register. Since this should
* happen fairly fast, it is polled with no OS waits between.
*/
static int write_params(unsigned char *params, int num_params)
{
unsigned int retry_count;
retry_count = SONY_READY_RETRIES;
while ((retry_count > 0) && (!is_param_write_rdy())) {
retry_count--;
}
if (!is_param_write_rdy()) {
return -EIO;
}
while (num_params > 0) {
write_param(*params);
params++;
num_params--;
}
return 0;
}
/*
* The following reads data from the command result register. It is a
* fairly complex routine, all status info flows back through this
* interface. The algorithm is stolen directly from the flowcharts in
* the drive manual.
*/
static void
get_result(unsigned char *result_buffer, unsigned int *result_size)
{
unsigned char a, b;
int i;
unsigned long retry_count;
while (handle_sony_cd_attention());
/* Wait for the result data to be ready */
retry_count = jiffies + SONY_JIFFIES_TIMEOUT;
while (time_before(jiffies, retry_count)
&& (is_busy() || (!(is_result_ready())))) {
sony_sleep();
while (handle_sony_cd_attention());
}
if (is_busy() || (!(is_result_ready()))) {
pr_debug(PFX "timeout out %d\n", __LINE__);
result_buffer[0] = 0x20;
result_buffer[1] = SONY_TIMEOUT_OP_ERR;
*result_size = 2;
return;
}
/*
* Get the first two bytes. This determines what else needs
* to be done.
*/
clear_result_ready();
a = read_result_register();
*result_buffer = a;
result_buffer++;
/* Check for block error status result. */
if ((a & 0xf0) == 0x50) {
*result_size = 1;
return;
}
b = read_result_register();
*result_buffer = b;
result_buffer++;
*result_size = 2;
/*
* 0x20 means an error occurred. Byte 2 will have the error code.
* Otherwise, the command succeeded, byte 2 will have the count of
* how many more status bytes are coming.
*
* The result register can be read 10 bytes at a time, a wait for
* result ready to be asserted must be done between every 10 bytes.
*/
if ((a & 0xf0) != 0x20) {
if (b > 8) {
for (i = 0; i < 8; i++) {
*result_buffer = read_result_register();
result_buffer++;
(*result_size)++;
}
b = b - 8;
while (b > 10) {
retry_count = SONY_READY_RETRIES;
while ((retry_count > 0)
&& (!is_result_ready())) {
retry_count--;
}
if (!is_result_ready()) {
pr_debug(PFX "timeout out %d\n",
__LINE__);
result_buffer[0] = 0x20;
result_buffer[1] =
SONY_TIMEOUT_OP_ERR;
*result_size = 2;
return;
}
clear_result_ready();
for (i = 0; i < 10; i++) {
*result_buffer =
read_result_register();
result_buffer++;
(*result_size)++;
}
b = b - 10;
}
if (b > 0) {
retry_count = SONY_READY_RETRIES;
while ((retry_count > 0)
&& (!is_result_ready())) {
retry_count--;
}
if (!is_result_ready()) {
pr_debug(PFX "timeout out %d\n",
__LINE__);
result_buffer[0] = 0x20;
result_buffer[1] =
SONY_TIMEOUT_OP_ERR;
*result_size = 2;
return;
}
}
}
while (b > 0) {
*result_buffer = read_result_register();
result_buffer++;
(*result_size)++;
b--;
}
}
}
/*
* Do a command that does not involve data transfer. This routine must
* be re-entrant from the same task to support being called from the
* data operation code when an error occurs.
*/
static void
do_sony_cd_cmd(unsigned char cmd,
unsigned char *params,
unsigned int num_params,
unsigned char *result_buffer, unsigned int *result_size)
{
unsigned long retry_count;
int num_retries = 0;
retry_cd_operation:
while (handle_sony_cd_attention());
retry_count = jiffies + SONY_JIFFIES_TIMEOUT;
while (time_before(jiffies, retry_count) && (is_busy())) {
sony_sleep();
while (handle_sony_cd_attention());
}
if (is_busy()) {
pr_debug(PFX "timeout out %d\n", __LINE__);
result_buffer[0] = 0x20;
result_buffer[1] = SONY_TIMEOUT_OP_ERR;
*result_size = 2;
} else {
clear_result_ready();
clear_param_reg();
write_params(params, num_params);
write_cmd(cmd);
get_result(result_buffer, result_size);
}
if (((result_buffer[0] & 0xf0) == 0x20)
&& (num_retries < MAX_CDU31A_RETRIES)) {
num_retries++;
msleep(100);
goto retry_cd_operation;
}
}
/*
* Handle an attention from the drive. This will return 1 if it found one
* or 0 if not (if one is found, the caller might want to call again).
*
* This routine counts the number of consecutive times it is called
* (since this is always called from a while loop until it returns
* a 0), and returns a 0 if it happens too many times. This will help
* prevent a lockup.
*/
static int handle_sony_cd_attention(void)
{
unsigned char atten_code;
static int num_consecutive_attentions = 0;
volatile int val;
#if 0
pr_debug(PFX "Entering %s\n", __FUNCTION__);
#endif
if (is_attention()) {
if (num_consecutive_attentions >
CDU31A_MAX_CONSECUTIVE_ATTENTIONS) {
printk(KERN_NOTICE PFX "Too many consecutive "
"attentions: %d\n", num_consecutive_attentions);
num_consecutive_attentions = 0;
pr_debug(PFX "Leaving %s at %d\n", __FUNCTION__,
__LINE__);
return 0;
}
clear_attention();
atten_code = read_result_register();
switch (atten_code) {
/* Someone changed the CD. Mark it as changed */
case SONY_MECH_LOADED_ATTN:
disk_changed = 1;
sony_toc_read = 0;
sony_audio_status = CDROM_AUDIO_NO_STATUS;
sony_blocks_left = 0;
break;
case SONY_SPIN_DOWN_COMPLETE_ATTN:
/* Mark the disk as spun down. */
sony_spun_up = 0;
break;
case SONY_AUDIO_PLAY_DONE_ATTN:
sony_audio_status = CDROM_AUDIO_COMPLETED;
read_subcode();
break;
case SONY_EJECT_PUSHED_ATTN:
if (is_auto_eject) {
sony_audio_status = CDROM_AUDIO_INVALID;
}
break;
case SONY_LEAD_IN_ERR_ATTN:
case SONY_LEAD_OUT_ERR_ATTN:
case SONY_DATA_TRACK_ERR_ATTN:
case SONY_AUDIO_PLAYBACK_ERR_ATTN:
sony_audio_status = CDROM_AUDIO_ERROR;
break;
}
num_consecutive_attentions++;
pr_debug(PFX "Leaving %s at %d\n", __FUNCTION__, __LINE__);
return 1;
} else if (abort_read_started) {
while (is_result_reg_not_empty()) {
val = read_result_register();
}
clear_data_ready();
clear_result_ready();
/* Clear out the data */
while (is_data_requested()) {
val = read_data_register();
}
abort_read_started = 0;
pr_debug(PFX "Leaving %s at %d\n", __FUNCTION__, __LINE__);
return 1;
}
num_consecutive_attentions = 0;
#if 0
pr_debug(PFX "Leaving %s at %d\n", __FUNCTION__, __LINE__);
#endif
return 0;
}
/* Convert from an integer 0-99 to BCD */