acsi.c
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上传用户:ajay2009
上传日期:2009-05-22
资源大小:495k
文件大小:45k
源码类别:
驱动编程
开发平台:
Unix_Linux
- /*
- * 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 */
- typedef void Scsi_Device; /* hack to avoid including scsi.h */
- #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 byten" );
- #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( ": %sn", 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 interruptn" );
- }
- /* 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 timeoutn" );
- 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 blockn" );
- 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 blockn" );
- bad_rw_intr();
- goto repeat;
- }
- SET_TIMER();
- return;
- }
- panic("unknown ACSI command");
- }
- /***********************************************************************
- *
- * Misc functions: ioctl, open, release, check_change, ...
- *
- ***********************************************************************/
- 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 HDIO_GETGEO:
- /* HDIO_GETGEO is supported more for getting the partition's
- * start sector... */
- { struct hd_geometry *geo = (struct hd_geometry *)arg;
- /* just fake some geometry here, it's nonsense anyway; to make it
- * easy, use Adaptec's usual 64/32 mapping */
- put_user( 64, &geo->heads );
- put_user( 32, &geo->sectors );
- put_user( aip->size >> 11, &geo->cylinders );
- put_user(get_start_sect(inode->i_bdev), &geo->start);
- return 0;
- }
- 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 changen", disk->disk_name );
- aip->changed = 1;
- }
- }
- }
- else {
- printk( KERN_ERR "%s: Test for medium changed timed out; "
- "assuming a changen", 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 datan", 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(" CCSn");
- 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: timeoutn", 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 %dn",
- 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 %dn",
- 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 failedn");
- 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 %dn",
- aip->target, aip->lun, extsense);
- #endif
- return DEV_UNKNOWN;
- }
- }
- else {
- if (reqsense & 0x7f) {
- #ifdef DEBUG_DETECT
- printk("target %d lun %d: sense %dn",
- 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=4n",
- 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, "