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linux-sg2042/drivers/block/acsi.c

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/*
* acsi.c -- Device driver for Atari ACSI hard disks
*
* Copyright 1994 Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de>
*
* Some parts are based on hd.c by Linus Torvalds
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive for
* more details.
*
*/
/*
* Still to in this file:
* - If a command ends with an error status (!= 0), the following
* REQUEST SENSE commands (4 to fill the ST-DMA FIFO) are done by
* polling the _IRQ signal (not interrupt-driven). This should be
* avoided in future because it takes up a non-neglectible time in
* the interrupt service routine while interrupts are disabled.
* Maybe a timer interrupt will get lost :-(
*/
/*
* General notes:
*
* - All ACSI devices (disks, CD-ROMs, ...) use major number 28.
* Minors are organized like it is with SCSI: The upper 4 bits
* identify the device, the lower 4 bits the partition.
* The device numbers (the upper 4 bits) are given in the same
* order as the devices are found on the bus.
* - Up to 8 LUNs are supported for each target (if CONFIG_ACSI_MULTI_LUN
* is defined), but only a total of 16 devices (due to minor
* numbers...). Note that Atari allows only a maximum of 4 targets
* (i.e. controllers, not devices) on the ACSI bus!
* - A optimizing scheme similar to SCSI scatter-gather is implemented.
* - Removable media are supported. After a medium change to device
* is reinitialized (partition check etc.). Also, if the device
* knows the PREVENT/ALLOW MEDIUM REMOVAL command, the door should
* be locked and unlocked when mounting the first or unmounting the
* last filesystem on the device. The code is untested, because I
* don't have a removable hard disk.
*
*/
#include <linux/config.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/genhd.h>
#include <linux/delay.h>
#include <linux/mm.h>
#include <linux/major.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <scsi/scsi.h> /* for SCSI_IOCTL_GET_IDLUN */
#include <scsi/scsi_ioctl.h>
#include <linux/hdreg.h> /* for HDIO_GETGEO */
#include <linux/blkpg.h>
#include <linux/buffer_head.h>
#include <linux/blkdev.h>
#include <asm/setup.h>
#include <asm/pgtable.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/atarihw.h>
#include <asm/atariints.h>
#include <asm/atari_acsi.h>
#include <asm/atari_stdma.h>
#include <asm/atari_stram.h>
static void (*do_acsi)(void) = NULL;
static struct request_queue *acsi_queue;
#define QUEUE (acsi_queue)
#define CURRENT elv_next_request(acsi_queue)
#define DEBUG
#undef DEBUG_DETECT
#undef NO_WRITE
#define MAX_ERRORS 8 /* Max read/write errors/sector */
#define MAX_LUN 8 /* Max LUNs per target */
#define MAX_DEV 16
#define ACSI_BUFFER_SIZE (16*1024) /* "normal" ACSI buffer size */
#define ACSI_BUFFER_MINSIZE (2048) /* min. buf size if ext. DMA */
#define ACSI_BUFFER_SIZE_ORDER 2 /* order size for above */
#define ACSI_BUFFER_MINSIZE_ORDER 0 /* order size for above */
#define ACSI_BUFFER_SECTORS (ACSI_BUFFER_SIZE/512)
#define ACSI_BUFFER_ORDER \
(ATARIHW_PRESENT(EXTD_DMA) ? \
ACSI_BUFFER_MINSIZE_ORDER : \
ACSI_BUFFER_SIZE_ORDER)
#define ACSI_TIMEOUT (4*HZ)
/* minimum delay between two commands */
#define COMMAND_DELAY 500
typedef enum {
NONE, HARDDISK, CDROM
} ACSI_TYPE;
struct acsi_info_struct {
ACSI_TYPE type; /* type of device */
unsigned target; /* target number */
unsigned lun; /* LUN in target controller */
unsigned removable : 1; /* Flag for removable media */
unsigned read_only : 1; /* Flag for read only devices */
unsigned old_atari_disk : 1; /* Is an old Atari disk */
unsigned changed : 1; /* Medium has been changed */
unsigned long size; /* #blocks */
int access_count;
} acsi_info[MAX_DEV];
/*
* SENSE KEYS
*/
#define NO_SENSE 0x00
#define RECOVERED_ERROR 0x01
#define NOT_READY 0x02
#define MEDIUM_ERROR 0x03
#define HARDWARE_ERROR 0x04
#define ILLEGAL_REQUEST 0x05
#define UNIT_ATTENTION 0x06
#define DATA_PROTECT 0x07
#define BLANK_CHECK 0x08
#define COPY_ABORTED 0x0a
#define ABORTED_COMMAND 0x0b
#define VOLUME_OVERFLOW 0x0d
#define MISCOMPARE 0x0e
/*
* DEVICE TYPES
*/
#define TYPE_DISK 0x00
#define TYPE_TAPE 0x01
#define TYPE_WORM 0x04
#define TYPE_ROM 0x05
#define TYPE_MOD 0x07
#define TYPE_NO_LUN 0x7f
/* The data returned by MODE SENSE differ between the old Atari
* hard disks and SCSI disks connected to ACSI. In the following, both
* formats are defined and some macros to operate on them potably.
*/
typedef struct {
unsigned long dummy[2];
unsigned long sector_size;
unsigned char format_code;
#define ATARI_SENSE_FORMAT_FIX 1
#define ATARI_SENSE_FORMAT_CHNG 2
unsigned char cylinders_h;
unsigned char cylinders_l;
unsigned char heads;
unsigned char reduced_h;
unsigned char reduced_l;
unsigned char precomp_h;
unsigned char precomp_l;
unsigned char landing_zone;
unsigned char steprate;
unsigned char type;
#define ATARI_SENSE_TYPE_FIXCHNG_MASK 4
#define ATARI_SENSE_TYPE_SOFTHARD_MASK 8
#define ATARI_SENSE_TYPE_FIX 4
#define ATARI_SENSE_TYPE_CHNG 0
#define ATARI_SENSE_TYPE_SOFT 0
#define ATARI_SENSE_TYPE_HARD 8
unsigned char sectors;
} ATARI_SENSE_DATA;
#define ATARI_CAPACITY(sd) \
(((int)((sd).cylinders_h<<8)|(sd).cylinders_l) * \
(sd).heads * (sd).sectors)
typedef struct {
unsigned char dummy1;
unsigned char medium_type;
unsigned char dummy2;
unsigned char descriptor_size;
unsigned long block_count;
unsigned long sector_size;
/* Page 0 data */
unsigned char page_code;
unsigned char page_size;
unsigned char page_flags;
unsigned char qualifier;
} SCSI_SENSE_DATA;
#define SCSI_CAPACITY(sd) ((sd).block_count & 0xffffff)
typedef union {
ATARI_SENSE_DATA atari;
SCSI_SENSE_DATA scsi;
} SENSE_DATA;
#define SENSE_TYPE_UNKNOWN 0
#define SENSE_TYPE_ATARI 1
#define SENSE_TYPE_SCSI 2
#define SENSE_TYPE(sd) \
(((sd).atari.dummy[0] == 8 && \
((sd).atari.format_code == 1 || \
(sd).atari.format_code == 2)) ? SENSE_TYPE_ATARI : \
((sd).scsi.dummy1 >= 11) ? SENSE_TYPE_SCSI : \
SENSE_TYPE_UNKNOWN)
#define CAPACITY(sd) \
(SENSE_TYPE(sd) == SENSE_TYPE_ATARI ? \
ATARI_CAPACITY((sd).atari) : \
SCSI_CAPACITY((sd).scsi))
#define SECTOR_SIZE(sd) \
(SENSE_TYPE(sd) == SENSE_TYPE_ATARI ? \
(sd).atari.sector_size : \
(sd).scsi.sector_size & 0xffffff)
/* Default size if capacity cannot be determined (1 GByte) */
#define DEFAULT_SIZE 0x1fffff
#define CARTRCH_STAT(aip,buf) \
(aip->old_atari_disk ? \
(((buf)[0] & 0x7f) == 0x28) : \
((((buf)[0] & 0x70) == 0x70) ? \
(((buf)[2] & 0x0f) == 0x06) : \
(((buf)[0] & 0x0f) == 0x06))) \
/* These two are also exported to other drivers that work on the ACSI bus and
* need an ST-RAM buffer. */
char *acsi_buffer;
unsigned long phys_acsi_buffer;
static int NDevices;
static int CurrentNReq;
static int CurrentNSect;
static char *CurrentBuffer;
static DEFINE_SPINLOCK(acsi_lock);
#define SET_TIMER() mod_timer(&acsi_timer, jiffies + ACSI_TIMEOUT)
#define CLEAR_TIMER() del_timer(&acsi_timer)
static unsigned long STramMask;
#define STRAM_ADDR(a) (((a) & STramMask) == 0)
/* ACSI commands */
static char tur_cmd[6] = { 0x00, 0, 0, 0, 0, 0 };
static char modesense_cmd[6] = { 0x1a, 0, 0, 0, 24, 0 };
static char modeselect_cmd[6] = { 0x15, 0, 0, 0, 12, 0 };
static char inquiry_cmd[6] = { 0x12, 0, 0, 0,255, 0 };
static char reqsense_cmd[6] = { 0x03, 0, 0, 0, 4, 0 };
static char read_cmd[6] = { 0x08, 0, 0, 0, 0, 0 };
static char write_cmd[6] = { 0x0a, 0, 0, 0, 0, 0 };
static char pa_med_rem_cmd[6] = { 0x1e, 0, 0, 0, 0, 0 };
#define CMDSET_TARG_LUN(cmd,targ,lun) \
do { \
cmd[0] = (cmd[0] & ~0xe0) | (targ)<<5; \
cmd[1] = (cmd[1] & ~0xe0) | (lun)<<5; \
} while(0)
#define CMDSET_BLOCK(cmd,blk) \
do { \
unsigned long __blk = (blk); \
cmd[3] = __blk; __blk >>= 8; \
cmd[2] = __blk; __blk >>= 8; \
cmd[1] = (cmd[1] & 0xe0) | (__blk & 0x1f); \
} while(0)
#define CMDSET_LEN(cmd,len) \
do { \
cmd[4] = (len); \
} while(0)
/* ACSI errors (from REQUEST SENSE); There are two tables, one for the
* old Atari disks and one for SCSI on ACSI disks.
*/
struct acsi_error {
unsigned char code;
const char *text;
} atari_acsi_errors[] = {
{ 0x00, "No error (??)" },
{ 0x01, "No index pulses" },
{ 0x02, "Seek not complete" },
{ 0x03, "Write fault" },
{ 0x04, "Drive not ready" },
{ 0x06, "No Track 00 signal" },
{ 0x10, "ECC error in ID field" },
{ 0x11, "Uncorrectable data error" },
{ 0x12, "ID field address mark not found" },
{ 0x13, "Data field address mark not found" },
{ 0x14, "Record not found" },
{ 0x15, "Seek error" },
{ 0x18, "Data check in no retry mode" },
{ 0x19, "ECC error during verify" },
{ 0x1a, "Access to bad block" },
{ 0x1c, "Unformatted or bad format" },
{ 0x20, "Invalid command" },
{ 0x21, "Invalid block address" },
{ 0x23, "Volume overflow" },
{ 0x24, "Invalid argument" },
{ 0x25, "Invalid drive number" },
{ 0x26, "Byte zero parity check" },
{ 0x28, "Cartride changed" },
{ 0x2c, "Error count overflow" },
{ 0x30, "Controller selftest failed" }
},
scsi_acsi_errors[] = {
{ 0x00, "No error (??)" },
{ 0x01, "Recovered error" },
{ 0x02, "Drive not ready" },
{ 0x03, "Uncorrectable medium error" },
{ 0x04, "Hardware error" },
{ 0x05, "Illegal request" },
{ 0x06, "Unit attention (Reset or cartridge changed)" },
{ 0x07, "Data protection" },
{ 0x08, "Blank check" },
{ 0x0b, "Aborted Command" },
{ 0x0d, "Volume overflow" }
};
/***************************** Prototypes *****************************/
static int acsicmd_dma( const char *cmd, char *buffer, int blocks, int
rwflag, int enable);
static int acsi_reqsense( char *buffer, int targ, int lun);
static void acsi_print_error(const unsigned char *errblk, struct acsi_info_struct *aip);
static irqreturn_t acsi_interrupt (int irq, void *data, struct pt_regs *fp);
static void unexpected_acsi_interrupt( void );
static void bad_rw_intr( void );
static void read_intr( void );
static void write_intr( void);
static void acsi_times_out( unsigned long dummy );
static void copy_to_acsibuffer( void );
static void copy_from_acsibuffer( void );
static void do_end_requests( void );
static void do_acsi_request( request_queue_t * );
static void redo_acsi_request( void );
static int acsi_ioctl( struct inode *inode, struct file *file, unsigned int
cmd, unsigned long arg );
static int acsi_open( struct inode * inode, struct file * filp );
static int acsi_release( struct inode * inode, struct file * file );
static void acsi_prevent_removal(struct acsi_info_struct *aip, int flag );
static int acsi_change_blk_size( int target, int lun);
static int acsi_mode_sense( int target, int lun, SENSE_DATA *sd );
static int acsi_revalidate (struct gendisk *disk);
/************************* End of Prototypes **************************/
DEFINE_TIMER(acsi_timer, acsi_times_out, 0, 0);
#ifdef CONFIG_ATARI_SLM
extern int attach_slm( int target, int lun );
extern int slm_init( void );
#endif
/***********************************************************************
*
* ACSI primitives
*
**********************************************************************/
/*
* The following two functions wait for _IRQ to become Low or High,
* resp., with a timeout. The 'timeout' parameter is in jiffies
* (10ms).
* If the functions are called with timer interrupts on (int level <
* 6), the timeout is based on the 'jiffies' variable to provide exact
* timeouts for device probing etc.
* If interrupts are disabled, the number of tries is based on the
* 'loops_per_jiffy' variable. A rough estimation is sufficient here...
*/
#define INT_LEVEL \
({ unsigned __sr; \
__asm__ __volatile__ ( "movew %/sr,%0" : "=dm" (__sr) ); \
(__sr >> 8) & 7; \
})
int acsi_wait_for_IRQ( unsigned timeout )
{
if (INT_LEVEL < 6) {
unsigned long maxjif = jiffies + timeout;
while (time_before(jiffies, maxjif))
if (!(mfp.par_dt_reg & 0x20)) return( 1 );
}
else {
long tries = loops_per_jiffy / 8 * timeout;
while( --tries >= 0 )
if (!(mfp.par_dt_reg & 0x20)) return( 1 );
}
return( 0 ); /* timeout! */
}
int acsi_wait_for_noIRQ( unsigned timeout )
{
if (INT_LEVEL < 6) {
unsigned long maxjif = jiffies + timeout;
while (time_before(jiffies, maxjif))
if (mfp.par_dt_reg & 0x20) return( 1 );
}
else {
long tries = loops_per_jiffy * timeout / 8;
while( tries-- >= 0 )
if (mfp.par_dt_reg & 0x20) return( 1 );
}
return( 0 ); /* timeout! */
}
static struct timeval start_time;
void
acsi_delay_start(void)
{
do_gettimeofday(&start_time);
}
/* wait from acsi_delay_start to now usec (<1E6) usec */
void
acsi_delay_end(long usec)
{
struct timeval end_time;
long deltau,deltas;
do_gettimeofday(&end_time);
deltau=end_time.tv_usec - start_time.tv_usec;
deltas=end_time.tv_sec - start_time.tv_sec;
if (deltas > 1 || deltas < 0)
return;
if (deltas > 0)
deltau += 1000*1000;
if (deltau >= usec)
return;
udelay(usec-deltau);
}
/* acsicmd_dma() sends an ACSI command and sets up the DMA to transfer
* 'blocks' blocks of 512 bytes from/to 'buffer'.
* Because the _IRQ signal is used for handshaking the command bytes,
* the ACSI interrupt has to be disabled in this function. If the end
* of the operation should be signalled by a real interrupt, it has to be
* reenabled afterwards.
*/
static int acsicmd_dma( const char *cmd, char *buffer, int blocks, int rwflag, int enable)
{ unsigned long flags, paddr;
int i;
#ifdef NO_WRITE
if (rwflag || *cmd == 0x0a) {
printk( "ACSI: Write commands disabled!\n" );
return( 0 );
}
#endif
rwflag = rwflag ? 0x100 : 0;
paddr = virt_to_phys( buffer );
acsi_delay_end(COMMAND_DELAY);
DISABLE_IRQ();
local_irq_save(flags);
/* Low on A1 */
dma_wd.dma_mode_status = 0x88 | rwflag;
MFPDELAY();
/* set DMA address */
dma_wd.dma_lo = (unsigned char)paddr;
paddr >>= 8;
MFPDELAY();
dma_wd.dma_md = (unsigned char)paddr;
paddr >>= 8;
MFPDELAY();
if (ATARIHW_PRESENT(EXTD_DMA))
st_dma_ext_dmahi = (unsigned short)paddr;
else
dma_wd.dma_hi = (unsigned char)paddr;
MFPDELAY();
local_irq_restore(flags);
/* send the command bytes except the last */
for( i = 0; i < 5; ++i ) {
DMA_LONG_WRITE( *cmd++, 0x8a | rwflag );
udelay(20);
if (!acsi_wait_for_IRQ( HZ/2 )) return( 0 ); /* timeout */
}
/* Clear FIFO and switch DMA to correct direction */
dma_wd.dma_mode_status = 0x92 | (rwflag ^ 0x100);
MFPDELAY();
dma_wd.dma_mode_status = 0x92 | rwflag;
MFPDELAY();
/* How many sectors for DMA */
dma_wd.fdc_acces_seccount = blocks;
MFPDELAY();
/* send last command byte */
dma_wd.dma_mode_status = 0x8a | rwflag;
MFPDELAY();
DMA_LONG_WRITE( *cmd++, 0x0a | rwflag );
if (enable)
ENABLE_IRQ();
udelay(80);
return( 1 );
}
/*
* acsicmd_nodma() sends an ACSI command that requires no DMA.
*/
int acsicmd_nodma( const char *cmd, int enable)
{ int i;
acsi_delay_end(COMMAND_DELAY);
DISABLE_IRQ();
/* send first command byte */
dma_wd.dma_mode_status = 0x88;
MFPDELAY();
DMA_LONG_WRITE( *cmd++, 0x8a );
udelay(20);
if (!acsi_wait_for_IRQ( HZ/2 )) return( 0 ); /* timeout */
/* send the intermediate command bytes */
for( i = 0; i < 4; ++i ) {
DMA_LONG_WRITE( *cmd++, 0x8a );
udelay(20);
if (!acsi_wait_for_IRQ( HZ/2 )) return( 0 ); /* timeout */
}
/* send last command byte */
DMA_LONG_WRITE( *cmd++, 0x0a );
if (enable)
ENABLE_IRQ();
udelay(80);
return( 1 );
/* Note that the ACSI interrupt is still disabled after this
* function. If you want to get the IRQ delivered, enable it manually!
*/
}
static int acsi_reqsense( char *buffer, int targ, int lun)
{
CMDSET_TARG_LUN( reqsense_cmd, targ, lun);
if (!acsicmd_dma( reqsense_cmd, buffer, 1, 0, 0 )) return( 0 );
if (!acsi_wait_for_IRQ( 10 )) return( 0 );
acsi_getstatus();
if (!acsicmd_nodma( reqsense_cmd, 0 )) return( 0 );
if (!acsi_wait_for_IRQ( 10 )) return( 0 );
acsi_getstatus();
if (!acsicmd_nodma( reqsense_cmd, 0 )) return( 0 );
if (!acsi_wait_for_IRQ( 10 )) return( 0 );
acsi_getstatus();
if (!acsicmd_nodma( reqsense_cmd, 0 )) return( 0 );
if (!acsi_wait_for_IRQ( 10 )) return( 0 );
acsi_getstatus();
dma_cache_maintenance( virt_to_phys(buffer), 16, 0 );
return( 1 );
}
/*
* ACSI status phase: get the status byte from the bus
*
* I've seen several times that a 0xff status is read, propably due to
* a timing error. In this case, the procedure is repeated after the
* next _IRQ edge.
*/
int acsi_getstatus( void )
{ int status;
DISABLE_IRQ();
for(;;) {
if (!acsi_wait_for_IRQ( 100 )) {
acsi_delay_start();
return( -1 );
}
dma_wd.dma_mode_status = 0x8a;
MFPDELAY();
status = dma_wd.fdc_acces_seccount;
if (status != 0xff) break;
#ifdef DEBUG
printk("ACSI: skipping 0xff status byte\n" );
#endif
udelay(40);
acsi_wait_for_noIRQ( 20 );
}
dma_wd.dma_mode_status = 0x80;
udelay(40);
acsi_wait_for_noIRQ( 20 );
acsi_delay_start();
return( status & 0x1f ); /* mask of the device# */
}
#if (defined(CONFIG_ATARI_SLM) || defined(CONFIG_ATARI_SLM_MODULE))
/* Receive data in an extended status phase. Needed by SLM printer. */
int acsi_extstatus( char *buffer, int cnt )
{ int status;
DISABLE_IRQ();
udelay(80);
while( cnt-- > 0 ) {
if (!acsi_wait_for_IRQ( 40 )) return( 0 );
dma_wd.dma_mode_status = 0x8a;
MFPDELAY();
status = dma_wd.fdc_acces_seccount;
MFPDELAY();
*buffer++ = status & 0xff;
udelay(40);
}
return( 1 );
}
/* Finish an extended status phase */
void acsi_end_extstatus( void )
{
dma_wd.dma_mode_status = 0x80;
udelay(40);
acsi_wait_for_noIRQ( 20 );
acsi_delay_start();
}
/* Send data in an extended command phase */
int acsi_extcmd( unsigned char *buffer, int cnt )
{
while( cnt-- > 0 ) {
DMA_LONG_WRITE( *buffer++, 0x8a );
udelay(20);
if (!acsi_wait_for_IRQ( HZ/2 )) return( 0 ); /* timeout */
}
return( 1 );
}
#endif
static void acsi_print_error(const unsigned char *errblk, struct acsi_info_struct *aip)
{ int atari_err, i, errcode;
struct acsi_error *arr;
atari_err = aip->old_atari_disk;
if (atari_err)
errcode = errblk[0] & 0x7f;
else
if ((errblk[0] & 0x70) == 0x70)
errcode = errblk[2] & 0x0f;
else
errcode = errblk[0] & 0x0f;
printk( KERN_ERR "ACSI error 0x%02x", errcode );
if (errblk[0] & 0x80)
printk( " for sector %d",
((errblk[1] & 0x1f) << 16) |
(errblk[2] << 8) | errblk[0] );
arr = atari_err ? atari_acsi_errors : scsi_acsi_errors;
i = atari_err ? sizeof(atari_acsi_errors)/sizeof(*atari_acsi_errors) :
sizeof(scsi_acsi_errors)/sizeof(*scsi_acsi_errors);
for( --i; i >= 0; --i )
if (arr[i].code == errcode) break;
if (i >= 0)
printk( ": %s\n", arr[i].text );
}
/*******************************************************************
*
* ACSI interrupt routine
* Test, if this is a ACSI interrupt and call the irq handler
* Otherwise ignore this interrupt.
*
*******************************************************************/
static irqreturn_t acsi_interrupt(int irq, void *data, struct pt_regs *fp )
{ void (*acsi_irq_handler)(void) = do_acsi;
do_acsi = NULL;
CLEAR_TIMER();
if (!acsi_irq_handler)
acsi_irq_handler = unexpected_acsi_interrupt;
acsi_irq_handler();
return IRQ_HANDLED;
}
/******************************************************************
*
* The Interrupt handlers
*
*******************************************************************/
static void unexpected_acsi_interrupt( void )
{
printk( KERN_WARNING "Unexpected ACSI interrupt\n" );
}
/* This function is called in case of errors. Because we cannot reset
* the ACSI bus or a single device, there is no other choice than
* retrying several times :-(
*/
static void bad_rw_intr( void )
{
if (!CURRENT)
return;
if (++CURRENT->errors >= MAX_ERRORS)
end_request(CURRENT, 0);
/* Otherwise just retry */
}
static void read_intr( void )
{ int status;
status = acsi_getstatus();
if (status != 0) {
struct gendisk *disk = CURRENT->rq_disk;
struct acsi_info_struct *aip = disk->private_data;
printk(KERN_ERR "%s: ", disk->disk_name);
if (!acsi_reqsense(acsi_buffer, aip->target, aip->lun))
printk( "ACSI error and REQUEST SENSE failed (status=0x%02x)\n", status );
else {
acsi_print_error(acsi_buffer, aip);
if (CARTRCH_STAT(aip, acsi_buffer))
aip->changed = 1;
}
ENABLE_IRQ();
bad_rw_intr();
redo_acsi_request();
return;
}
dma_cache_maintenance( virt_to_phys(CurrentBuffer), CurrentNSect*512, 0 );
if (CurrentBuffer == acsi_buffer)
copy_from_acsibuffer();
do_end_requests();
redo_acsi_request();
}
static void write_intr(void)
{ int status;
status = acsi_getstatus();
if (status != 0) {
struct gendisk *disk = CURRENT->rq_disk;
struct acsi_info_struct *aip = disk->private_data;
printk( KERN_ERR "%s: ", disk->disk_name);
if (!acsi_reqsense( acsi_buffer, aip->target, aip->lun))
printk( "ACSI error and REQUEST SENSE failed (status=0x%02x)\n", status );
else {
acsi_print_error(acsi_buffer, aip);
if (CARTRCH_STAT(aip, acsi_buffer))
aip->changed = 1;
}
bad_rw_intr();
redo_acsi_request();
return;
}
do_end_requests();
redo_acsi_request();
}
static void acsi_times_out( unsigned long dummy )
{
DISABLE_IRQ();
if (!do_acsi) return;
do_acsi = NULL;
printk( KERN_ERR "ACSI timeout\n" );
if (!CURRENT)
return;
if (++CURRENT->errors >= MAX_ERRORS) {
#ifdef DEBUG
printk( KERN_ERR "ACSI: too many errors.\n" );
#endif
end_request(CURRENT, 0);
}
redo_acsi_request();
}
/***********************************************************************
*
* Scatter-gather utility functions
*
***********************************************************************/
static void copy_to_acsibuffer( void )
{ int i;
char *src, *dst;
struct buffer_head *bh;
src = CURRENT->buffer;
dst = acsi_buffer;
bh = CURRENT->bh;
if (!bh)
memcpy( dst, src, CurrentNSect*512 );
else
for( i = 0; i < CurrentNReq; ++i ) {
memcpy( dst, src, bh->b_size );
dst += bh->b_size;
if ((bh = bh->b_reqnext))
src = bh->b_data;
}
}
static void copy_from_acsibuffer( void )
{ int i;
char *src, *dst;
struct buffer_head *bh;
dst = CURRENT->buffer;
src = acsi_buffer;
bh = CURRENT->bh;
if (!bh)
memcpy( dst, src, CurrentNSect*512 );
else
for( i = 0; i < CurrentNReq; ++i ) {
memcpy( dst, src, bh->b_size );
src += bh->b_size;
if ((bh = bh->b_reqnext))
dst = bh->b_data;
}
}
static void do_end_requests( void )
{ int i, n;
if (!CURRENT->bh) {
CURRENT->nr_sectors -= CurrentNSect;
CURRENT->current_nr_sectors -= CurrentNSect;
CURRENT->sector += CurrentNSect;
if (CURRENT->nr_sectors == 0)
end_request(CURRENT, 1);
}
else {
for( i = 0; i < CurrentNReq; ++i ) {
n = CURRENT->bh->b_size >> 9;
CURRENT->nr_sectors -= n;
CURRENT->current_nr_sectors -= n;
CURRENT->sector += n;
end_request(CURRENT, 1);
}
}
}
/***********************************************************************
*
* do_acsi_request and friends
*
***********************************************************************/
static void do_acsi_request( request_queue_t * q )
{
stdma_lock( acsi_interrupt, NULL );
redo_acsi_request();
}
static void redo_acsi_request( void )
{
unsigned block, target, lun, nsect;
char *buffer;
unsigned long pbuffer;
struct buffer_head *bh;
struct gendisk *disk;
struct acsi_info_struct *aip;
repeat:
CLEAR_TIMER();
if (do_acsi)
return;
if (!CURRENT) {
do_acsi = NULL;
ENABLE_IRQ();
stdma_release();
return;
}
disk = CURRENT->rq_disk;
aip = disk->private_data;
if (CURRENT->bh) {
if (!CURRENT->bh && !buffer_locked(CURRENT->bh))
panic("ACSI: block not locked");
}
block = CURRENT->sector;
if (block+CURRENT->nr_sectors >= get_capacity(disk)) {
#ifdef DEBUG
printk( "%s: attempted access for blocks %d...%ld past end of device at block %ld.\n",
disk->disk_name,
block, block + CURRENT->nr_sectors - 1,
get_capacity(disk));
#endif
end_request(CURRENT, 0);
goto repeat;
}
if (aip->changed) {
printk( KERN_NOTICE "%s: request denied because cartridge has "
"been changed.\n", disk->disk_name);
end_request(CURRENT, 0);
goto repeat;
}
target = aip->target;
lun = aip->lun;
/* Find out how many sectors should be transferred from/to
* consecutive buffers and thus can be done with a single command.
*/
buffer = CURRENT->buffer;
pbuffer = virt_to_phys(buffer);
nsect = CURRENT->current_nr_sectors;
CurrentNReq = 1;
if ((bh = CURRENT->bh) && bh != CURRENT->bhtail) {
if (!STRAM_ADDR(pbuffer)) {
/* If transfer is done via the ACSI buffer anyway, we can
* assemble as much bh's as fit in the buffer.
*/
while( (bh = bh->b_reqnext) ) {
if (nsect + (bh->b_size>>9) > ACSI_BUFFER_SECTORS) break;
nsect += bh->b_size >> 9;
++CurrentNReq;
if (bh == CURRENT->bhtail) break;
}
buffer = acsi_buffer;
pbuffer = phys_acsi_buffer;
}
else {
unsigned long pendadr, pnewadr;
pendadr = pbuffer + nsect*512;
while( (bh = bh->b_reqnext) ) {
pnewadr = virt_to_phys(bh->b_data);
if (!STRAM_ADDR(pnewadr) || pendadr != pnewadr) break;
nsect += bh->b_size >> 9;
pendadr = pnewadr + bh->b_size;
++CurrentNReq;
if (bh == CURRENT->bhtail) break;
}
}
}
else {
if (!STRAM_ADDR(pbuffer)) {
buffer = acsi_buffer;
pbuffer = phys_acsi_buffer;
if (nsect > ACSI_BUFFER_SECTORS)
nsect = ACSI_BUFFER_SECTORS;
}
}
CurrentBuffer = buffer;
CurrentNSect = nsect;
if (rq_data_dir(CURRENT) == WRITE) {
CMDSET_TARG_LUN( write_cmd, target, lun );
CMDSET_BLOCK( write_cmd, block );
CMDSET_LEN( write_cmd, nsect );
if (buffer == acsi_buffer)
copy_to_acsibuffer();
dma_cache_maintenance( pbuffer, nsect*512, 1 );
do_acsi = write_intr;
if (!acsicmd_dma( write_cmd, buffer, nsect, 1, 1)) {
do_acsi = NULL;
printk( KERN_ERR "ACSI (write): Timeout in command block\n" );
bad_rw_intr();
goto repeat;
}
SET_TIMER();
return;
}
if (rq_data_dir(CURRENT) == READ) {
CMDSET_TARG_LUN( read_cmd, target, lun );
CMDSET_BLOCK( read_cmd, block );
CMDSET_LEN( read_cmd, nsect );
do_acsi = read_intr;
if (!acsicmd_dma( read_cmd, buffer, nsect, 0, 1)) {
do_acsi = NULL;
printk( KERN_ERR "ACSI (read): Timeout in command block\n" );
bad_rw_intr();
goto repeat;
}
SET_TIMER();
return;
}
panic("unknown ACSI command");
}
/***********************************************************************
*
* Misc functions: ioctl, open, release, check_change, ...
*
***********************************************************************/
static int acsi_getgeo(struct block_device *bdev, struct hd_geometry *geo)
{
struct acsi_info_struct *aip = bdev->bd_disk->private_data;
/*
* Just fake some geometry here, it's nonsense anyway
* To make it easy, use Adaptec's usual 64/32 mapping
*/
geo->heads = 64;
geo->sectors = 32;
geo->cylinders = aip->size >> 11;
return 0;
}
static int acsi_ioctl( struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg )
{
struct gendisk *disk = inode->i_bdev->bd_disk;
struct acsi_info_struct *aip = disk->private_data;
switch (cmd) {
case SCSI_IOCTL_GET_IDLUN:
/* SCSI compatible GET_IDLUN call to get target's ID and LUN number */
put_user( aip->target | (aip->lun << 8),
&((Scsi_Idlun *) arg)->dev_id );
put_user( 0, &((Scsi_Idlun *) arg)->host_unique_id );
return 0;
default:
return -EINVAL;
}
}
/*
* Open a device, check for read-only and lock the medium if it is
* removable.
*
* Changes by Martin Rogge, 9th Aug 1995:
* Check whether check_disk_change (and therefore revalidate_acsidisk)
* was successful. They fail when there is no medium in the drive.
*
* The problem of media being changed during an operation can be
* ignored because of the prevent_removal code.
*
* Added check for the validity of the device number.
*
*/
static int acsi_open( struct inode * inode, struct file * filp )
{
struct gendisk *disk = inode->i_bdev->bd_disk;
struct acsi_info_struct *aip = disk->private_data;
if (aip->access_count == 0 && aip->removable) {
#if 0
aip->changed = 1; /* safety first */
#endif
check_disk_change( inode->i_bdev );
if (aip->changed) /* revalidate was not successful (no medium) */
return -ENXIO;
acsi_prevent_removal(aip, 1);
}
aip->access_count++;
if (filp && filp->f_mode) {
check_disk_change( inode->i_bdev );
if (filp->f_mode & 2) {
if (aip->read_only) {
acsi_release( inode, filp );
return -EROFS;
}
}
}
return 0;
}
/*
* Releasing a block device means we sync() it, so that it can safely
* be forgotten about...
*/
static int acsi_release( struct inode * inode, struct file * file )
{
struct gendisk *disk = inode->i_bdev->bd_disk;
struct acsi_info_struct *aip = disk->private_data;
if (--aip->access_count == 0 && aip->removable)
acsi_prevent_removal(aip, 0);
return( 0 );
}
/*
* Prevent or allow a media change for removable devices.
*/
static void acsi_prevent_removal(struct acsi_info_struct *aip, int flag)
{
stdma_lock( NULL, NULL );
CMDSET_TARG_LUN(pa_med_rem_cmd, aip->target, aip->lun);
CMDSET_LEN( pa_med_rem_cmd, flag );
if (acsicmd_nodma(pa_med_rem_cmd, 0) && acsi_wait_for_IRQ(3*HZ))
acsi_getstatus();
/* Do not report errors -- some devices may not know this command. */
ENABLE_IRQ();
stdma_release();
}
static int acsi_media_change(struct gendisk *disk)
{
struct acsi_info_struct *aip = disk->private_data;
if (!aip->removable)
return 0;
if (aip->changed)
/* We can be sure that the medium has been changed -- REQUEST
* SENSE has reported this earlier.
*/
return 1;
/* If the flag isn't set, make a test by reading block 0.
* If errors happen, it seems to be better to say "changed"...
*/
stdma_lock( NULL, NULL );
CMDSET_TARG_LUN(read_cmd, aip->target, aip->lun);
CMDSET_BLOCK( read_cmd, 0 );
CMDSET_LEN( read_cmd, 1 );
if (acsicmd_dma(read_cmd, acsi_buffer, 1, 0, 0) &&
acsi_wait_for_IRQ(3*HZ)) {
if (acsi_getstatus()) {
if (acsi_reqsense(acsi_buffer, aip->target, aip->lun)) {
if (CARTRCH_STAT(aip, acsi_buffer))
aip->changed = 1;
}
else {
printk( KERN_ERR "%s: REQUEST SENSE failed in test for "
"medium change; assuming a change\n", disk->disk_name );
aip->changed = 1;
}
}
}
else {
printk( KERN_ERR "%s: Test for medium changed timed out; "
"assuming a change\n", disk->disk_name);
aip->changed = 1;
}
ENABLE_IRQ();
stdma_release();
/* Now, after reading a block, the changed status is surely valid. */
return aip->changed;
}
static int acsi_change_blk_size( int target, int lun)
{ int i;
for (i=0; i<12; i++)
acsi_buffer[i] = 0;
acsi_buffer[3] = 8;
acsi_buffer[10] = 2;
CMDSET_TARG_LUN( modeselect_cmd, target, lun);
if (!acsicmd_dma( modeselect_cmd, acsi_buffer, 1,1,0) ||
!acsi_wait_for_IRQ( 3*HZ ) ||
acsi_getstatus() != 0 ) {
return(0);
}
return(1);
}
static int acsi_mode_sense( int target, int lun, SENSE_DATA *sd )
{
int page;
CMDSET_TARG_LUN( modesense_cmd, target, lun );
for (page=0; page<4; page++) {
modesense_cmd[2] = page;
if (!acsicmd_dma( modesense_cmd, acsi_buffer, 1, 0, 0 ) ||
!acsi_wait_for_IRQ( 3*HZ ) ||
acsi_getstatus())
continue;
/* read twice to jump over the second 16-byte border! */
udelay(300);
if (acsi_wait_for_noIRQ( 20 ) &&
acsicmd_nodma( modesense_cmd, 0 ) &&
acsi_wait_for_IRQ( 3*HZ ) &&
acsi_getstatus() == 0)
break;
}
if (page == 4) {
return(0);
}
dma_cache_maintenance( phys_acsi_buffer, sizeof(SENSE_DATA), 0 );
*sd = *(SENSE_DATA *)acsi_buffer;
/* Validity check, depending on type of data */
switch( SENSE_TYPE(*sd) ) {
case SENSE_TYPE_ATARI:
if (CAPACITY(*sd) == 0)
goto invalid_sense;
break;
case SENSE_TYPE_SCSI:
if (sd->scsi.descriptor_size != 8)
goto invalid_sense;
break;
case SENSE_TYPE_UNKNOWN:
printk( KERN_ERR "ACSI target %d, lun %d: Cannot interpret "
"sense data\n", target, lun );
invalid_sense:
#ifdef DEBUG
{ int i;
printk( "Mode sense data for ACSI target %d, lun %d seem not valid:",
target, lun );
for( i = 0; i < sizeof(SENSE_DATA); ++i )
printk( "%02x ", (unsigned char)acsi_buffer[i] );
printk( "\n" );
}
#endif
return( 0 );
}
return( 1 );
}
/*******************************************************************
*
* Initialization
*
********************************************************************/
extern struct block_device_operations acsi_fops;
static struct gendisk *acsi_gendisk[MAX_DEV];
#define MAX_SCSI_DEVICE_CODE 10
static const char *const scsi_device_types[MAX_SCSI_DEVICE_CODE] =
{
"Direct-Access ",
"Sequential-Access",
"Printer ",
"Processor ",
"WORM ",
"CD-ROM ",
"Scanner ",
"Optical Device ",
"Medium Changer ",
"Communications "
};
static void print_inquiry(unsigned char *data)
{
int i;
printk(KERN_INFO " Vendor: ");
for (i = 8; i < 16; i++)
{
if (data[i] >= 0x20 && i < data[4] + 5)
printk("%c", data[i]);
else
printk(" ");
}
printk(" Model: ");
for (i = 16; i < 32; i++)
{
if (data[i] >= 0x20 && i < data[4] + 5)
printk("%c", data[i]);
else
printk(" ");
}
printk(" Rev: ");
for (i = 32; i < 36; i++)
{
if (data[i] >= 0x20 && i < data[4] + 5)
printk("%c", data[i]);
else
printk(" ");
}
printk("\n");
i = data[0] & 0x1f;
printk(KERN_INFO " Type: %s ", (i < MAX_SCSI_DEVICE_CODE
? scsi_device_types[i]
: "Unknown "));
printk(" ANSI SCSI revision: %02x", data[2] & 0x07);
if ((data[2] & 0x07) == 1 && (data[3] & 0x0f) == 1)
printk(" CCS\n");
else
printk("\n");
}
/*
* Changes by Martin Rogge, 9th Aug 1995:
* acsi_devinit has been taken out of acsi_geninit, because it needs
* to be called from revalidate_acsidisk. The result of request sense
* is now checked for DRIVE NOT READY.
*
* The structure *aip is only valid when acsi_devinit returns
* DEV_SUPPORTED.
*
*/
#define DEV_NONE 0
#define DEV_UNKNOWN 1
#define DEV_SUPPORTED 2
#define DEV_SLM 3
static int acsi_devinit(struct acsi_info_struct *aip)
{
int status, got_inquiry;
SENSE_DATA sense;
unsigned char reqsense, extsense;
/*****************************************************************/
/* Do a TEST UNIT READY command to test the presence of a device */
/*****************************************************************/
CMDSET_TARG_LUN(tur_cmd, aip->target, aip->lun);
if (!acsicmd_nodma(tur_cmd, 0)) {
/* timed out -> no device here */
#ifdef DEBUG_DETECT
printk("target %d lun %d: timeout\n", aip->target, aip->lun);
#endif
return DEV_NONE;
}
/*************************/
/* Read the ACSI status. */
/*************************/
status = acsi_getstatus();
if (status) {
if (status == 0x12) {
/* The SLM printer should be the only device that
* responds with the error code in the status byte. In
* correct status bytes, bit 4 is never set.
*/
printk( KERN_INFO "Detected SLM printer at id %d lun %d\n",
aip->target, aip->lun);
return DEV_SLM;
}
/* ignore CHECK CONDITION, since some devices send a
UNIT ATTENTION */
if ((status & 0x1e) != 0x2) {
#ifdef DEBUG_DETECT
printk("target %d lun %d: status %d\n",
aip->target, aip->lun, status);
#endif
return DEV_UNKNOWN;
}
}
/*******************************/
/* Do a REQUEST SENSE command. */
/*******************************/
if (!acsi_reqsense(acsi_buffer, aip->target, aip->lun)) {
printk( KERN_WARNING "acsi_reqsense failed\n");
acsi_buffer[0] = 0;
acsi_buffer[2] = UNIT_ATTENTION;
}
reqsense = acsi_buffer[0];
extsense = acsi_buffer[2] & 0xf;
if (status) {
if ((reqsense & 0x70) == 0x70) { /* extended sense */
if (extsense != UNIT_ATTENTION &&
extsense != NOT_READY) {
#ifdef DEBUG_DETECT
printk("target %d lun %d: extended sense %d\n",
aip->target, aip->lun, extsense);
#endif
return DEV_UNKNOWN;
}
}
else {
if (reqsense & 0x7f) {
#ifdef DEBUG_DETECT
printk("target %d lun %d: sense %d\n",
aip->target, aip->lun, reqsense);
#endif
return DEV_UNKNOWN;
}
}
}
else
if (reqsense == 0x4) { /* SH204 Bug workaround */
#ifdef DEBUG_DETECT
printk("target %d lun %d status=0 sense=4\n",
aip->target, aip->lun);
#endif
return DEV_UNKNOWN;
}
/***********************************************************/
/* Do an INQUIRY command to get more infos on this device. */
/***********************************************************/
/* Assume default values */
aip->removable = 1;
aip->read_only = 0;
aip->old_atari_disk = 0;
aip->changed = (extsense == NOT_READY); /* medium inserted? */
aip->size = DEFAULT_SIZE;
got_inquiry = 0;
/* Fake inquiry result for old atari disks */
memcpy(acsi_buffer, "\000\000\001\000 Adaptec 40xx"
" ", 40);
CMDSET_TARG_LUN(inquiry_cmd, aip->target, aip->lun);
if (acsicmd_dma(inquiry_cmd, acsi_buffer, 1, 0, 0) &&
acsi_getstatus() == 0) {
acsicmd_nodma(inquiry_cmd, 0);
acsi_getstatus();
dma_cache_maintenance( phys_acsi_buffer, 256, 0 );
got_inquiry = 1;
aip->removable = !!(acsi_buffer[1] & 0x80);
}
if (aip->type == NONE) /* only at boot time */
print_inquiry(acsi_buffer);
switch(acsi_buffer[0]) {
case TYPE_DISK:
aip->type = HARDDISK;
break;
case TYPE_ROM:
aip->type = CDROM;
aip->read_only = 1;
break;
default:
return DEV_UNKNOWN;
}
/****************************/
/* Do a MODE SENSE command. */
/****************************/
if (!acsi_mode_sense(aip->target, aip->lun, &sense)) {
printk( KERN_WARNING "No mode sense data.\n" );
return DEV_UNKNOWN;
}
if ((SECTOR_SIZE(sense) != 512) &&
((aip->type != CDROM) ||
!acsi_change_blk_size(aip->target, aip->lun) ||
!acsi_mode_sense(aip->target, aip->lun, &sense) ||
(SECTOR_SIZE(sense) != 512))) {
printk( KERN_WARNING "Sector size != 512 not supported.\n" );
return DEV_UNKNOWN;
}
/* There are disks out there that claim to have 0 sectors... */
if (CAPACITY(sense))
aip->size = CAPACITY(sense); /* else keep DEFAULT_SIZE */
if (!got_inquiry && SENSE_TYPE(sense) == SENSE_TYPE_ATARI) {
/* If INQUIRY failed and the sense data suggest an old
* Atari disk (SH20x, Megafile), the disk is not removable
*/
aip->removable = 0;
aip->old_atari_disk = 1;
}
/******************/
/* We've done it. */
/******************/
return DEV_SUPPORTED;
}
EXPORT_SYMBOL(acsi_delay_start);
EXPORT_SYMBOL(acsi_delay_end);
EXPORT_SYMBOL(acsi_wait_for_IRQ);
EXPORT_SYMBOL(acsi_wait_for_noIRQ);
EXPORT_SYMBOL(acsicmd_nodma);
EXPORT_SYMBOL(acsi_getstatus);
EXPORT_SYMBOL(acsi_buffer);
EXPORT_SYMBOL(phys_acsi_buffer);
#ifdef CONFIG_ATARI_SLM_MODULE
void acsi_attach_SLMs( int (*attach_func)( int, int ) );
EXPORT_SYMBOL(acsi_extstatus);
EXPORT_SYMBOL(acsi_end_extstatus);
EXPORT_SYMBOL(acsi_extcmd);
EXPORT_SYMBOL(acsi_attach_SLMs);
/* to remember IDs of SLM devices, SLM module is loaded later
* (index is target#, contents is lun#, -1 means "no SLM") */
int SLM_devices[8];
#endif
static struct block_device_operations acsi_fops = {
.owner = THIS_MODULE,
.open = acsi_open,
.release = acsi_release,
.ioctl = acsi_ioctl,
.getgeo = acsi_getgeo,
.media_changed = acsi_media_change,
.revalidate_disk= acsi_revalidate,
};
#ifdef CONFIG_ATARI_SLM_MODULE
/* call attach_slm() for each device that is a printer; needed for init of SLM
* driver as a module, since it's not yet present if acsi.c is inited and thus
* the bus gets scanned. */
void acsi_attach_SLMs( int (*attach_func)( int, int ) )
{
int i, n = 0;
for( i = 0; i < 8; ++i )
if (SLM_devices[i] >= 0)
n += (*attach_func)( i, SLM_devices[i] );
printk( KERN_INFO "Found %d SLM printer(s) total.\n", n );
}
#endif /* CONFIG_ATARI_SLM_MODULE */
int acsi_init( void )
{
int err = 0;
int i, target, lun;
struct acsi_info_struct *aip;
#ifdef CONFIG_ATARI_SLM
int n_slm = 0;
#endif
if (!MACH_IS_ATARI || !ATARIHW_PRESENT(ACSI))
return 0;
if (register_blkdev(ACSI_MAJOR, "ad")) {
err = -EBUSY;
goto out1;
}
if (!(acsi_buffer =
(char *)atari_stram_alloc(ACSI_BUFFER_SIZE, "acsi"))) {
err = -ENOMEM;
printk( KERN_ERR "Unable to get ACSI ST-Ram buffer.\n" );
goto out2;
}
phys_acsi_buffer = virt_to_phys( acsi_buffer );
STramMask = ATARIHW_PRESENT(EXTD_DMA) ? 0x00000000 : 0xff000000;
acsi_queue = blk_init_queue(do_acsi_request, &acsi_lock);
if (!acsi_queue) {
err = -ENOMEM;
goto out2a;
}
#ifdef CONFIG_ATARI_SLM
err = slm_init();
#endif
if (err)
goto out3;
printk( KERN_INFO "Probing ACSI devices:\n" );
NDevices = 0;
#ifdef CONFIG_ATARI_SLM_MODULE
for( i = 0; i < 8; ++i )
SLM_devices[i] = -1;
#endif
stdma_lock(NULL, NULL);
for (target = 0; target < 8 && NDevices < MAX_DEV; ++target) {
lun = 0;
do {
aip = &acsi_info[NDevices];
aip->type = NONE;
aip->target = target;
aip->lun = lun;
i = acsi_devinit(aip);
switch (i) {
case DEV_SUPPORTED:
printk( KERN_INFO "Detected ");
switch (aip->type) {
case HARDDISK:
printk("disk");
break;
case CDROM:
printk("cdrom");
break;
default:
}
printk(" ad%c at id %d lun %d ",
'a' + NDevices, target, lun);
if (aip->removable)
printk("(removable) ");
if (aip->read_only)
printk("(read-only) ");
if (aip->size == DEFAULT_SIZE)
printk(" unkown size, using default ");
printk("%ld MByte\n",
(aip->size*512+1024*1024/2)/(1024*1024));
NDevices++;
break;
case DEV_SLM:
#ifdef CONFIG_ATARI_SLM
n_slm += attach_slm( target, lun );
break;
#endif
#ifdef CONFIG_ATARI_SLM_MODULE
SLM_devices[target] = lun;
break;
#endif
/* neither of the above: fall through to unknown device */
case DEV_UNKNOWN:
printk( KERN_INFO "Detected unsupported device at "
"id %d lun %d\n", target, lun);
break;
}
}
#ifdef CONFIG_ACSI_MULTI_LUN
while (i != DEV_NONE && ++lun < MAX_LUN);
#else
while (0);
#endif
}
/* reenable interrupt */
ENABLE_IRQ();
stdma_release();
#ifndef CONFIG_ATARI_SLM
printk( KERN_INFO "Found %d ACSI device(s) total.\n", NDevices );
#else
printk( KERN_INFO "Found %d ACSI device(s) and %d SLM printer(s) total.\n",
NDevices, n_slm );
#endif
err = -ENOMEM;
for( i = 0; i < NDevices; ++i ) {
acsi_gendisk[i] = alloc_disk(16);
if (!acsi_gendisk[i])
goto out4;
}
for( i = 0; i < NDevices; ++i ) {
struct gendisk *disk = acsi_gendisk[i];
sprintf(disk->disk_name, "ad%c", 'a'+i);
aip = &acsi_info[NDevices];
sprintf(disk->devfs_name, "ad/target%d/lun%d", aip->target, aip->lun);
disk->major = ACSI_MAJOR;
disk->first_minor = i << 4;
if (acsi_info[i].type != HARDDISK) {
disk->minors = 1;
strcat(disk->devfs_name, "/disc");
}
disk->fops = &acsi_fops;
disk->private_data = &acsi_info[i];
set_capacity(disk, acsi_info[i].size);
disk->queue = acsi_queue;
add_disk(disk);
}
return 0;
out4:
while (i--)
put_disk(acsi_gendisk[i]);
out3:
blk_cleanup_queue(acsi_queue);
out2a:
atari_stram_free( acsi_buffer );
out2:
unregister_blkdev( ACSI_MAJOR, "ad" );
out1:
return err;
}
#ifdef MODULE
MODULE_LICENSE("GPL");
int init_module(void)
{
int err;
if ((err = acsi_init()))
return( err );
printk( KERN_INFO "ACSI driver loaded as module.\n");
return( 0 );
}
void cleanup_module(void)
{
int i;
del_timer( &acsi_timer );
blk_cleanup_queue(acsi_queue);
atari_stram_free( acsi_buffer );
if (unregister_blkdev( ACSI_MAJOR, "ad" ) != 0)
printk( KERN_ERR "acsi: cleanup_module failed\n");
for (i = 0; i < NDevices; i++) {
del_gendisk(acsi_gendisk[i]);
put_disk(acsi_gendisk[i]);
}
}
#endif
/*
* This routine is called to flush all partitions and partition tables
* for a changed scsi disk, and then re-read the new partition table.
* If we are revalidating a disk because of a media change, then we
* enter with usage == 0. If we are using an ioctl, we automatically have
* usage == 1 (we need an open channel to use an ioctl :-), so this
* is our limit.
*
* Changes by Martin Rogge, 9th Aug 1995:
* got cd-roms to work by calling acsi_devinit. There are only two problems:
* First, if there is no medium inserted, the status will remain "changed".
* That is no problem at all, but our design of three-valued logic (medium
* changed, medium not changed, no medium inserted).
* Secondly the check could fail completely and the drive could deliver
* nonsensical data, which could mess up the acsi_info[] structure. In
* that case we try to make the entry safe.
*
*/
static int acsi_revalidate(struct gendisk *disk)
{
struct acsi_info_struct *aip = disk->private_data;
stdma_lock( NULL, NULL );
if (acsi_devinit(aip) != DEV_SUPPORTED) {
printk( KERN_ERR "ACSI: revalidate failed for target %d lun %d\n",
aip->target, aip->lun);
aip->size = 0;
aip->read_only = 1;
aip->removable = 1;
aip->changed = 1; /* next acsi_open will try again... */
}
ENABLE_IRQ();
stdma_release();
set_capacity(disk, aip->size);
return 0;
}
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