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linux/drivers/block/acsi.c
David Howells 7d12e780e0 IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.

The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around.  On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).

Where appropriate, an arch may override the generic storage facility and do
something different with the variable.  On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.

Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions.  Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller.  A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.

I've build this code with allyesconfig for x86_64 and i386.  I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.

This will affect all archs.  Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:

	struct pt_regs *old_regs = set_irq_regs(regs);

And put the old one back at the end:

	set_irq_regs(old_regs);

Don't pass regs through to generic_handle_irq() or __do_IRQ().

In timer_interrupt(), this sort of change will be necessary:

	-	update_process_times(user_mode(regs));
	-	profile_tick(CPU_PROFILING, regs);
	+	update_process_times(user_mode(get_irq_regs()));
	+	profile_tick(CPU_PROFILING);

I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().

Some notes on the interrupt handling in the drivers:

 (*) input_dev() is now gone entirely.  The regs pointer is no longer stored in
     the input_dev struct.

 (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking.  It does
     something different depending on whether it's been supplied with a regs
     pointer or not.

 (*) Various IRQ handler function pointers have been moved to type
     irq_handler_t.

Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 15:10:12 +01:00

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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/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);
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 )
{ 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];
disk->major = ACSI_MAJOR;
disk->first_minor = i << 4;
if (acsi_info[i].type != HARDDISK)
disk->minors = 1;
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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