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Diffstat (limited to 'drivers/block/acsi.c')
| -rw-r--r-- | drivers/block/acsi.c | 1829 |
1 files changed, 1829 insertions, 0 deletions
diff --git a/drivers/block/acsi.c b/drivers/block/acsi.c new file mode 100644 index 00000000000..ce933de4808 --- /dev/null +++ b/drivers/block/acsi.c @@ -0,0 +1,1829 @@ +/* + * 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 **************************/ + + +struct timer_list acsi_timer = TIMER_INITIALIZER(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_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 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, + .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; +} |