2 * acsi.c -- Device driver for Atari ACSI hard disks
4 * Copyright 1994 Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de>
6 * Some parts are based on hd.c by Linus Torvalds
8 * This file is subject to the terms and conditions of the GNU General Public
9 * License. See the file COPYING in the main directory of this archive for
15 * Still to in this file:
16 * - If a command ends with an error status (!= 0), the following
17 * REQUEST SENSE commands (4 to fill the ST-DMA FIFO) are done by
18 * polling the _IRQ signal (not interrupt-driven). This should be
19 * avoided in future because it takes up a non-neglectible time in
20 * the interrupt service routine while interrupts are disabled.
21 * Maybe a timer interrupt will get lost :-(
27 * - All ACSI devices (disks, CD-ROMs, ...) use major number 28.
28 * Minors are organized like it is with SCSI: The upper 4 bits
29 * identify the device, the lower 4 bits the partition.
30 * The device numbers (the upper 4 bits) are given in the same
31 * order as the devices are found on the bus.
32 * - Up to 8 LUNs are supported for each target (if CONFIG_ACSI_MULTI_LUN
33 * is defined), but only a total of 16 devices (due to minor
34 * numbers...). Note that Atari allows only a maximum of 4 targets
35 * (i.e. controllers, not devices) on the ACSI bus!
36 * - A optimizing scheme similar to SCSI scatter-gather is implemented.
37 * - Removable media are supported. After a medium change to device
38 * is reinitialized (partition check etc.). Also, if the device
39 * knows the PREVENT/ALLOW MEDIUM REMOVAL command, the door should
40 * be locked and unlocked when mounting the first or unmounting the
41 * last filesystem on the device. The code is untested, because I
42 * don't have a removable hard disk.
46 #define MAJOR_NR ACSI_MAJOR
48 #include <linux/config.h>
49 #include <linux/module.h>
50 #include <linux/errno.h>
51 #include <linux/signal.h>
52 #include <linux/sched.h>
53 #include <linux/timer.h>
55 #include <linux/kernel.h>
56 #include <linux/genhd.h>
57 #include <linux/devfs_fs_kernel.h>
58 #include <linux/delay.h>
60 #include <linux/major.h>
61 #include <linux/blk.h>
62 #include <linux/slab.h>
63 #include <linux/interrupt.h>
64 #include <scsi/scsi.h> /* for SCSI_IOCTL_GET_IDLUN */
65 typedef void Scsi_Device; /* hack to avoid including scsi.h */
66 #include <scsi/scsi_ioctl.h>
67 #include <linux/hdreg.h> /* for HDIO_GETGEO */
68 #include <linux/blkpg.h>
70 #include <asm/setup.h>
71 #include <asm/pgtable.h>
72 #include <asm/system.h>
73 #include <asm/uaccess.h>
74 #include <asm/atarihw.h>
75 #include <asm/atariints.h>
76 #include <asm/atari_acsi.h>
77 #include <asm/atari_stdma.h>
78 #include <asm/atari_stram.h>
85 #define MAX_ERRORS 8 /* Max read/write errors/sector */
86 #define MAX_LUN 8 /* Max LUNs per target */
89 #define ACSI_BUFFER_SIZE (16*1024) /* "normal" ACSI buffer size */
90 #define ACSI_BUFFER_MINSIZE (2048) /* min. buf size if ext. DMA */
91 #define ACSI_BUFFER_SIZE_ORDER 2 /* order size for above */
92 #define ACSI_BUFFER_MINSIZE_ORDER 0 /* order size for above */
93 #define ACSI_BUFFER_SECTORS (ACSI_BUFFER_SIZE/512)
95 #define ACSI_BUFFER_ORDER \
96 (ATARIHW_PRESENT(EXTD_DMA) ? \
97 ACSI_BUFFER_MINSIZE_ORDER : \
98 ACSI_BUFFER_SIZE_ORDER)
100 #define ACSI_TIMEOUT (4*HZ)
102 /* minimum delay between two commands */
104 #define COMMAND_DELAY 500
107 NONE, HARDDISK, CDROM
110 struct acsi_info_struct {
111 ACSI_TYPE type; /* type of device */
112 unsigned target; /* target number */
113 unsigned lun; /* LUN in target controller */
114 unsigned removable : 1; /* Flag for removable media */
115 unsigned read_only : 1; /* Flag for read only devices */
116 unsigned old_atari_disk : 1; /* Is an old Atari disk */
117 unsigned changed : 1; /* Medium has been changed */
118 unsigned long size; /* #blocks */
119 } acsi_info[MAX_DEV];
125 #define NO_SENSE 0x00
126 #define RECOVERED_ERROR 0x01
127 #define NOT_READY 0x02
128 #define MEDIUM_ERROR 0x03
129 #define HARDWARE_ERROR 0x04
130 #define ILLEGAL_REQUEST 0x05
131 #define UNIT_ATTENTION 0x06
132 #define DATA_PROTECT 0x07
133 #define BLANK_CHECK 0x08
134 #define COPY_ABORTED 0x0a
135 #define ABORTED_COMMAND 0x0b
136 #define VOLUME_OVERFLOW 0x0d
137 #define MISCOMPARE 0x0e
144 #define TYPE_DISK 0x00
145 #define TYPE_TAPE 0x01
146 #define TYPE_WORM 0x04
147 #define TYPE_ROM 0x05
148 #define TYPE_MOD 0x07
149 #define TYPE_NO_LUN 0x7f
151 /* The data returned by MODE SENSE differ between the old Atari
152 * hard disks and SCSI disks connected to ACSI. In the following, both
153 * formats are defined and some macros to operate on them potably.
157 unsigned long dummy[2];
158 unsigned long sector_size;
159 unsigned char format_code;
160 #define ATARI_SENSE_FORMAT_FIX 1
161 #define ATARI_SENSE_FORMAT_CHNG 2
162 unsigned char cylinders_h;
163 unsigned char cylinders_l;
165 unsigned char reduced_h;
166 unsigned char reduced_l;
167 unsigned char precomp_h;
168 unsigned char precomp_l;
169 unsigned char landing_zone;
170 unsigned char steprate;
172 #define ATARI_SENSE_TYPE_FIXCHNG_MASK 4
173 #define ATARI_SENSE_TYPE_SOFTHARD_MASK 8
174 #define ATARI_SENSE_TYPE_FIX 4
175 #define ATARI_SENSE_TYPE_CHNG 0
176 #define ATARI_SENSE_TYPE_SOFT 0
177 #define ATARI_SENSE_TYPE_HARD 8
178 unsigned char sectors;
181 #define ATARI_CAPACITY(sd) \
182 (((int)((sd).cylinders_h<<8)|(sd).cylinders_l) * \
183 (sd).heads * (sd).sectors)
187 unsigned char dummy1;
188 unsigned char medium_type;
189 unsigned char dummy2;
190 unsigned char descriptor_size;
191 unsigned long block_count;
192 unsigned long sector_size;
194 unsigned char page_code;
195 unsigned char page_size;
196 unsigned char page_flags;
197 unsigned char qualifier;
200 #define SCSI_CAPACITY(sd) ((sd).block_count & 0xffffff)
204 ATARI_SENSE_DATA atari;
205 SCSI_SENSE_DATA scsi;
208 #define SENSE_TYPE_UNKNOWN 0
209 #define SENSE_TYPE_ATARI 1
210 #define SENSE_TYPE_SCSI 2
212 #define SENSE_TYPE(sd) \
213 (((sd).atari.dummy[0] == 8 && \
214 ((sd).atari.format_code == 1 || \
215 (sd).atari.format_code == 2)) ? SENSE_TYPE_ATARI : \
216 ((sd).scsi.dummy1 >= 11) ? SENSE_TYPE_SCSI : \
219 #define CAPACITY(sd) \
220 (SENSE_TYPE(sd) == SENSE_TYPE_ATARI ? \
221 ATARI_CAPACITY((sd).atari) : \
222 SCSI_CAPACITY((sd).scsi))
224 #define SECTOR_SIZE(sd) \
225 (SENSE_TYPE(sd) == SENSE_TYPE_ATARI ? \
226 (sd).atari.sector_size : \
227 (sd).scsi.sector_size & 0xffffff)
229 /* Default size if capacity cannot be determined (1 GByte) */
230 #define DEFAULT_SIZE 0x1fffff
232 #define CARTRCH_STAT(dev,buf) \
233 (acsi_info[(dev)].old_atari_disk ? \
234 (((buf)[0] & 0x7f) == 0x28) : \
235 ((((buf)[0] & 0x70) == 0x70) ? \
236 (((buf)[2] & 0x0f) == 0x06) : \
237 (((buf)[0] & 0x0f) == 0x06))) \
239 /* These two are also exported to other drivers that work on the ACSI bus and
240 * need an ST-RAM buffer. */
242 unsigned long phys_acsi_buffer;
244 static int NDevices = 0;
245 static int acsi_sizes[MAX_DEV<<4] = { 0, };
246 static int acsi_blocksizes[MAX_DEV<<4] = { 0, };
247 static struct hd_struct acsi_part[MAX_DEV<<4] = { {0,0}, };
248 static int access_count[MAX_DEV] = { 0, };
249 static char busy[MAX_DEV] = { 0, };
250 static DECLARE_WAIT_QUEUE_HEAD(busy_wait);
252 static int CurrentNReq;
253 static int CurrentNSect;
254 static char *CurrentBuffer;
257 #define SET_TIMER() mod_timer(&acsi_timer, jiffies + ACSI_TIMEOUT)
258 #define CLEAR_TIMER() del_timer(&acsi_timer)
260 static unsigned long STramMask;
261 #define STRAM_ADDR(a) (((a) & STramMask) == 0)
267 static char tur_cmd[6] = { 0x00, 0, 0, 0, 0, 0 };
268 static char modesense_cmd[6] = { 0x1a, 0, 0, 0, 24, 0 };
269 static char modeselect_cmd[6] = { 0x15, 0, 0, 0, 12, 0 };
270 static char inquiry_cmd[6] = { 0x12, 0, 0, 0,255, 0 };
271 static char reqsense_cmd[6] = { 0x03, 0, 0, 0, 4, 0 };
272 static char read_cmd[6] = { 0x08, 0, 0, 0, 0, 0 };
273 static char write_cmd[6] = { 0x0a, 0, 0, 0, 0, 0 };
274 static char pa_med_rem_cmd[6] = { 0x1e, 0, 0, 0, 0, 0 };
276 #define CMDSET_TARG_LUN(cmd,targ,lun) \
278 cmd[0] = (cmd[0] & ~0xe0) | (targ)<<5; \
279 cmd[1] = (cmd[1] & ~0xe0) | (lun)<<5; \
282 #define CMDSET_BLOCK(cmd,blk) \
284 unsigned long __blk = (blk); \
285 cmd[3] = __blk; __blk >>= 8; \
286 cmd[2] = __blk; __blk >>= 8; \
287 cmd[1] = (cmd[1] & 0xe0) | (__blk & 0x1f); \
290 #define CMDSET_LEN(cmd,len) \
295 /* ACSI errors (from REQUEST SENSE); There are two tables, one for the
296 * old Atari disks and one for SCSI on ACSI disks.
302 } atari_acsi_errors[] = {
303 { 0x00, "No error (??)" },
304 { 0x01, "No index pulses" },
305 { 0x02, "Seek not complete" },
306 { 0x03, "Write fault" },
307 { 0x04, "Drive not ready" },
308 { 0x06, "No Track 00 signal" },
309 { 0x10, "ECC error in ID field" },
310 { 0x11, "Uncorrectable data error" },
311 { 0x12, "ID field address mark not found" },
312 { 0x13, "Data field address mark not found" },
313 { 0x14, "Record not found" },
314 { 0x15, "Seek error" },
315 { 0x18, "Data check in no retry mode" },
316 { 0x19, "ECC error during verify" },
317 { 0x1a, "Access to bad block" },
318 { 0x1c, "Unformatted or bad format" },
319 { 0x20, "Invalid command" },
320 { 0x21, "Invalid block address" },
321 { 0x23, "Volume overflow" },
322 { 0x24, "Invalid argument" },
323 { 0x25, "Invalid drive number" },
324 { 0x26, "Byte zero parity check" },
325 { 0x28, "Cartride changed" },
326 { 0x2c, "Error count overflow" },
327 { 0x30, "Controller selftest failed" }
330 scsi_acsi_errors[] = {
331 { 0x00, "No error (??)" },
332 { 0x01, "Recovered error" },
333 { 0x02, "Drive not ready" },
334 { 0x03, "Uncorrectable medium error" },
335 { 0x04, "Hardware error" },
336 { 0x05, "Illegal request" },
337 { 0x06, "Unit attention (Reset or cartridge changed)" },
338 { 0x07, "Data protection" },
339 { 0x08, "Blank check" },
340 { 0x0b, "Aborted Command" },
341 { 0x0d, "Volume overflow" }
346 /***************************** Prototypes *****************************/
348 static int acsicmd_dma( const char *cmd, char *buffer, int blocks, int
350 static int acsi_reqsense( char *buffer, int targ, int lun);
351 static void acsi_print_error( const unsigned char *errblk, int dev );
352 static void acsi_interrupt (int irq, void *data, struct pt_regs *fp);
353 static void unexpected_acsi_interrupt( void );
354 static void bad_rw_intr( void );
355 static void read_intr( void );
356 static void write_intr( void);
357 static void acsi_times_out( unsigned long dummy );
358 static void copy_to_acsibuffer( void );
359 static void copy_from_acsibuffer( void );
360 static void do_end_requests( void );
361 static void do_acsi_request( request_queue_t * );
362 static void redo_acsi_request( void );
363 static int acsi_ioctl( struct inode *inode, struct file *file, unsigned int
364 cmd, unsigned long arg );
365 static int acsi_open( struct inode * inode, struct file * filp );
366 static int acsi_release( struct inode * inode, struct file * file );
367 static void acsi_prevent_removal( int target, int flag );
368 static int acsi_change_blk_size( int target, int lun);
369 static int acsi_mode_sense( int target, int lun, SENSE_DATA *sd );
370 static void acsi_geninit(void);
371 static int revalidate_acsidisk( int dev, int maxusage );
372 static int acsi_revalidate (dev_t);
374 /************************* End of Prototypes **************************/
377 struct timer_list acsi_timer = {
378 function: acsi_times_out
382 #ifdef CONFIG_ATARI_SLM
384 extern int attach_slm( int target, int lun );
385 extern int slm_init( void );
391 /***********************************************************************
395 **********************************************************************/
399 * The following two functions wait for _IRQ to become Low or High,
400 * resp., with a timeout. The 'timeout' parameter is in jiffies
402 * If the functions are called with timer interrupts on (int level <
403 * 6), the timeout is based on the 'jiffies' variable to provide exact
404 * timeouts for device probing etc.
405 * If interrupts are disabled, the number of tries is based on the
406 * 'loops_per_jiffy' variable. A rough estimation is sufficient here...
411 __asm__ __volatile__ ( "movew %/sr,%0" : "=dm" (__sr) ); \
415 int acsi_wait_for_IRQ( unsigned timeout )
419 unsigned long maxjif = jiffies + timeout;
420 while (time_before(jiffies, maxjif))
421 if (!(mfp.par_dt_reg & 0x20)) return( 1 );
424 long tries = loops_per_jiffy / 8 * timeout;
425 while( --tries >= 0 )
426 if (!(mfp.par_dt_reg & 0x20)) return( 1 );
428 return( 0 ); /* timeout! */
432 int acsi_wait_for_noIRQ( unsigned timeout )
436 unsigned long maxjif = jiffies + timeout;
437 while (time_before(jiffies, maxjif))
438 if (mfp.par_dt_reg & 0x20) return( 1 );
441 long tries = loops_per_jiffy * timeout / 8;
442 while( tries-- >= 0 )
443 if (mfp.par_dt_reg & 0x20) return( 1 );
445 return( 0 ); /* timeout! */
448 static struct timeval start_time;
451 acsi_delay_start(void)
453 do_gettimeofday(&start_time);
456 /* wait from acsi_delay_start to now usec (<1E6) usec */
459 acsi_delay_end(long usec)
461 struct timeval end_time;
463 do_gettimeofday(&end_time);
464 deltau=end_time.tv_usec - start_time.tv_usec;
465 deltas=end_time.tv_sec - start_time.tv_sec;
466 if (deltas > 1 || deltas < 0)
475 /* acsicmd_dma() sends an ACSI command and sets up the DMA to transfer
476 * 'blocks' blocks of 512 bytes from/to 'buffer'.
477 * Because the _IRQ signal is used for handshaking the command bytes,
478 * the ACSI interrupt has to be disabled in this function. If the end
479 * of the operation should be signalled by a real interrupt, it has to be
480 * reenabled afterwards.
483 static int acsicmd_dma( const char *cmd, char *buffer, int blocks, int rwflag, int enable)
485 { unsigned long flags, paddr;
489 if (rwflag || *cmd == 0x0a) {
490 printk( "ACSI: Write commands disabled!\n" );
495 rwflag = rwflag ? 0x100 : 0;
496 paddr = virt_to_phys( buffer );
498 acsi_delay_end(COMMAND_DELAY);
504 dma_wd.dma_mode_status = 0x88 | rwflag;
507 /* set DMA address */
508 dma_wd.dma_lo = (unsigned char)paddr;
511 dma_wd.dma_md = (unsigned char)paddr;
514 if (ATARIHW_PRESENT(EXTD_DMA))
515 st_dma_ext_dmahi = (unsigned short)paddr;
517 dma_wd.dma_hi = (unsigned char)paddr;
519 restore_flags(flags);
521 /* send the command bytes except the last */
522 for( i = 0; i < 5; ++i ) {
523 DMA_LONG_WRITE( *cmd++, 0x8a | rwflag );
525 if (!acsi_wait_for_IRQ( HZ/2 )) return( 0 ); /* timeout */
528 /* Clear FIFO and switch DMA to correct direction */
529 dma_wd.dma_mode_status = 0x92 | (rwflag ^ 0x100);
531 dma_wd.dma_mode_status = 0x92 | rwflag;
534 /* How many sectors for DMA */
535 dma_wd.fdc_acces_seccount = blocks;
538 /* send last command byte */
539 dma_wd.dma_mode_status = 0x8a | rwflag;
541 DMA_LONG_WRITE( *cmd++, 0x0a | rwflag );
551 * acsicmd_nodma() sends an ACSI command that requires no DMA.
554 int acsicmd_nodma( const char *cmd, int enable)
558 acsi_delay_end(COMMAND_DELAY);
561 /* send first command byte */
562 dma_wd.dma_mode_status = 0x88;
564 DMA_LONG_WRITE( *cmd++, 0x8a );
566 if (!acsi_wait_for_IRQ( HZ/2 )) return( 0 ); /* timeout */
568 /* send the intermediate command bytes */
569 for( i = 0; i < 4; ++i ) {
570 DMA_LONG_WRITE( *cmd++, 0x8a );
572 if (!acsi_wait_for_IRQ( HZ/2 )) return( 0 ); /* timeout */
575 /* send last command byte */
576 DMA_LONG_WRITE( *cmd++, 0x0a );
582 /* Note that the ACSI interrupt is still disabled after this
583 * function. If you want to get the IRQ delivered, enable it manually!
588 static int acsi_reqsense( char *buffer, int targ, int lun)
591 CMDSET_TARG_LUN( reqsense_cmd, targ, lun);
592 if (!acsicmd_dma( reqsense_cmd, buffer, 1, 0, 0 )) return( 0 );
593 if (!acsi_wait_for_IRQ( 10 )) return( 0 );
595 if (!acsicmd_nodma( reqsense_cmd, 0 )) return( 0 );
596 if (!acsi_wait_for_IRQ( 10 )) return( 0 );
598 if (!acsicmd_nodma( reqsense_cmd, 0 )) return( 0 );
599 if (!acsi_wait_for_IRQ( 10 )) return( 0 );
601 if (!acsicmd_nodma( reqsense_cmd, 0 )) return( 0 );
602 if (!acsi_wait_for_IRQ( 10 )) return( 0 );
604 dma_cache_maintenance( virt_to_phys(buffer), 16, 0 );
611 * ACSI status phase: get the status byte from the bus
613 * I've seen several times that a 0xff status is read, propably due to
614 * a timing error. In this case, the procedure is repeated after the
618 int acsi_getstatus( void )
624 if (!acsi_wait_for_IRQ( 100 )) {
628 dma_wd.dma_mode_status = 0x8a;
630 status = dma_wd.fdc_acces_seccount;
631 if (status != 0xff) break;
633 printk("ACSI: skipping 0xff status byte\n" );
636 acsi_wait_for_noIRQ( 20 );
638 dma_wd.dma_mode_status = 0x80;
640 acsi_wait_for_noIRQ( 20 );
643 return( status & 0x1f ); /* mask of the device# */
647 #if (defined(CONFIG_ATARI_SLM) || defined(CONFIG_ATARI_SLM_MODULE))
649 /* Receive data in an extended status phase. Needed by SLM printer. */
651 int acsi_extstatus( char *buffer, int cnt )
658 if (!acsi_wait_for_IRQ( 40 )) return( 0 );
659 dma_wd.dma_mode_status = 0x8a;
661 status = dma_wd.fdc_acces_seccount;
663 *buffer++ = status & 0xff;
670 /* Finish an extended status phase */
672 void acsi_end_extstatus( void )
675 dma_wd.dma_mode_status = 0x80;
677 acsi_wait_for_noIRQ( 20 );
682 /* Send data in an extended command phase */
684 int acsi_extcmd( unsigned char *buffer, int cnt )
688 DMA_LONG_WRITE( *buffer++, 0x8a );
690 if (!acsi_wait_for_IRQ( HZ/2 )) return( 0 ); /* timeout */
698 static void acsi_print_error( const unsigned char *errblk, int dev )
700 { int atari_err, i, errcode;
701 struct acsi_error *arr;
703 atari_err = acsi_info[dev].old_atari_disk;
705 errcode = errblk[0] & 0x7f;
707 if ((errblk[0] & 0x70) == 0x70)
708 errcode = errblk[2] & 0x0f;
710 errcode = errblk[0] & 0x0f;
712 printk( KERN_ERR "ACSI error 0x%02x", errcode );
714 if (errblk[0] & 0x80)
715 printk( " for sector %d",
716 ((errblk[1] & 0x1f) << 16) |
717 (errblk[2] << 8) | errblk[0] );
719 arr = atari_err ? atari_acsi_errors : scsi_acsi_errors;
720 i = atari_err ? sizeof(atari_acsi_errors)/sizeof(*atari_acsi_errors) :
721 sizeof(scsi_acsi_errors)/sizeof(*scsi_acsi_errors);
723 for( --i; i >= 0; --i )
724 if (arr[i].code == errcode) break;
726 printk( ": %s\n", arr[i].text );
729 /*******************************************************************
731 * ACSI interrupt routine
732 * Test, if this is a ACSI interrupt and call the irq handler
733 * Otherwise ignore this interrupt.
735 *******************************************************************/
737 static void acsi_interrupt(int irq, void *data, struct pt_regs *fp )
739 { void (*acsi_irq_handler)(void) = DEVICE_INTR;
744 if (!acsi_irq_handler)
745 acsi_irq_handler = unexpected_acsi_interrupt;
750 /******************************************************************
752 * The Interrupt handlers
754 *******************************************************************/
757 static void unexpected_acsi_interrupt( void )
760 printk( KERN_WARNING "Unexpected ACSI interrupt\n" );
764 /* This function is called in case of errors. Because we cannot reset
765 * the ACSI bus or a single device, there is no other choice than
766 * retrying several times :-(
769 static void bad_rw_intr( void )
775 if (++CURRENT->errors >= MAX_ERRORS)
777 /* Otherwise just retry */
781 static void read_intr( void )
785 status = acsi_getstatus();
787 int dev = DEVICE_NR(MINOR(CURRENT->rq_dev));
788 printk( KERN_ERR "ad%c: ", dev+'a' );
789 if (!acsi_reqsense( acsi_buffer, acsi_info[dev].target,
791 printk( "ACSI error and REQUEST SENSE failed (status=0x%02x)\n", status );
793 acsi_print_error( acsi_buffer, dev );
794 if (CARTRCH_STAT( dev, acsi_buffer ))
795 acsi_info[dev].changed = 1;
803 dma_cache_maintenance( virt_to_phys(CurrentBuffer), CurrentNSect*512, 0 );
804 if (CurrentBuffer == acsi_buffer)
805 copy_from_acsibuffer();
812 static void write_intr(void)
816 status = acsi_getstatus();
818 int dev = DEVICE_NR(MINOR(CURRENT->rq_dev));
819 printk( KERN_ERR "ad%c: ", dev+'a' );
820 if (!acsi_reqsense( acsi_buffer, acsi_info[dev].target,
822 printk( "ACSI error and REQUEST SENSE failed (status=0x%02x)\n", status );
824 acsi_print_error( acsi_buffer, dev );
825 if (CARTRCH_STAT( dev, acsi_buffer ))
826 acsi_info[dev].changed = 1;
838 static void acsi_times_out( unsigned long dummy )
842 if (!DEVICE_INTR) return;
845 printk( KERN_ERR "ACSI timeout\n" );
846 if (QUEUE_EMPTY) return;
847 if (++CURRENT->errors >= MAX_ERRORS) {
849 printk( KERN_ERR "ACSI: too many errors.\n" );
859 /***********************************************************************
861 * Scatter-gather utility functions
863 ***********************************************************************/
866 static void copy_to_acsibuffer( void )
870 struct buffer_head *bh;
872 src = CURRENT->buffer;
877 memcpy( dst, src, CurrentNSect*512 );
879 for( i = 0; i < CurrentNReq; ++i ) {
880 memcpy( dst, src, bh->b_size );
882 if ((bh = bh->b_reqnext))
888 static void copy_from_acsibuffer( void )
892 struct buffer_head *bh;
894 dst = CURRENT->buffer;
899 memcpy( dst, src, CurrentNSect*512 );
901 for( i = 0; i < CurrentNReq; ++i ) {
902 memcpy( dst, src, bh->b_size );
904 if ((bh = bh->b_reqnext))
910 static void do_end_requests( void )
915 CURRENT->nr_sectors -= CurrentNSect;
916 CURRENT->current_nr_sectors -= CurrentNSect;
917 CURRENT->sector += CurrentNSect;
918 if (CURRENT->nr_sectors == 0)
922 for( i = 0; i < CurrentNReq; ++i ) {
923 n = CURRENT->bh->b_size >> 9;
924 CURRENT->nr_sectors -= n;
925 CURRENT->current_nr_sectors -= n;
926 CURRENT->sector += n;
935 /***********************************************************************
937 * do_acsi_request and friends
939 ***********************************************************************/
941 static void do_acsi_request( request_queue_t * q )
944 stdma_lock( acsi_interrupt, NULL );
949 static void redo_acsi_request( void )
951 { unsigned block, dev, target, lun, nsect;
953 unsigned long pbuffer;
954 struct buffer_head *bh;
956 if (!QUEUE_EMPTY && CURRENT->rq_status == RQ_INACTIVE) {
969 /* Another check here: An interrupt or timer event could have
970 * happened since the last check!
972 if (!QUEUE_EMPTY && CURRENT->rq_status == RQ_INACTIVE) {
989 if (MAJOR(CURRENT->rq_dev) != MAJOR_NR)
990 panic(DEVICE_NAME ": request list destroyed");
992 if (!CURRENT->bh && !buffer_locked(CURRENT->bh))
993 panic(DEVICE_NAME ": block not locked");
996 dev = MINOR(CURRENT->rq_dev);
997 block = CURRENT->sector;
998 if (DEVICE_NR(dev) >= NDevices ||
999 block+CURRENT->nr_sectors >= acsi_part[dev].nr_sects) {
1001 printk( "ad%c: attempted access for blocks %d...%ld past end of device at block %ld.\n",
1003 block, block + CURRENT->nr_sectors - 1,
1004 acsi_part[dev].nr_sects);
1009 if (acsi_info[DEVICE_NR(dev)].changed) {
1010 printk( KERN_NOTICE "ad%c: request denied because cartridge has "
1011 "been changed.\n", DEVICE_NR(dev)+'a' );
1016 block += acsi_part[dev].start_sect;
1017 target = acsi_info[DEVICE_NR(dev)].target;
1018 lun = acsi_info[DEVICE_NR(dev)].lun;
1020 /* Find out how many sectors should be transferred from/to
1021 * consecutive buffers and thus can be done with a single command.
1023 buffer = CURRENT->buffer;
1024 pbuffer = virt_to_phys(buffer);
1025 nsect = CURRENT->current_nr_sectors;
1028 if ((bh = CURRENT->bh) && bh != CURRENT->bhtail) {
1029 if (!STRAM_ADDR(pbuffer)) {
1030 /* If transfer is done via the ACSI buffer anyway, we can
1031 * assemble as much bh's as fit in the buffer.
1033 while( (bh = bh->b_reqnext) ) {
1034 if (nsect + (bh->b_size>>9) > ACSI_BUFFER_SECTORS) break;
1035 nsect += bh->b_size >> 9;
1037 if (bh == CURRENT->bhtail) break;
1039 buffer = acsi_buffer;
1040 pbuffer = phys_acsi_buffer;
1043 unsigned long pendadr, pnewadr;
1044 pendadr = pbuffer + nsect*512;
1045 while( (bh = bh->b_reqnext) ) {
1046 pnewadr = virt_to_phys(bh->b_data);
1047 if (!STRAM_ADDR(pnewadr) || pendadr != pnewadr) break;
1048 nsect += bh->b_size >> 9;
1049 pendadr = pnewadr + bh->b_size;
1051 if (bh == CURRENT->bhtail) break;
1056 if (!STRAM_ADDR(pbuffer)) {
1057 buffer = acsi_buffer;
1058 pbuffer = phys_acsi_buffer;
1059 if (nsect > ACSI_BUFFER_SECTORS)
1060 nsect = ACSI_BUFFER_SECTORS;
1063 CurrentBuffer = buffer;
1064 CurrentNSect = nsect;
1066 if (CURRENT->cmd == WRITE) {
1067 CMDSET_TARG_LUN( write_cmd, target, lun );
1068 CMDSET_BLOCK( write_cmd, block );
1069 CMDSET_LEN( write_cmd, nsect );
1070 if (buffer == acsi_buffer)
1071 copy_to_acsibuffer();
1072 dma_cache_maintenance( pbuffer, nsect*512, 1 );
1073 SET_INTR(write_intr);
1074 if (!acsicmd_dma( write_cmd, buffer, nsect, 1, 1)) {
1076 printk( KERN_ERR "ACSI (write): Timeout in command block\n" );
1083 if (CURRENT->cmd == READ) {
1084 CMDSET_TARG_LUN( read_cmd, target, lun );
1085 CMDSET_BLOCK( read_cmd, block );
1086 CMDSET_LEN( read_cmd, nsect );
1087 SET_INTR(read_intr);
1088 if (!acsicmd_dma( read_cmd, buffer, nsect, 0, 1)) {
1090 printk( KERN_ERR "ACSI (read): Timeout in command block\n" );
1097 panic("unknown ACSI command");
1102 /***********************************************************************
1104 * Misc functions: ioctl, open, release, check_change, ...
1106 ***********************************************************************/
1109 static int acsi_ioctl( struct inode *inode, struct file *file,
1110 unsigned int cmd, unsigned long arg )
1115 dev = DEVICE_NR(MINOR(inode->i_rdev));
1116 if (dev >= NDevices)
1120 /* HDIO_GETGEO is supported more for getting the partition's
1121 * start sector... */
1122 { struct hd_geometry *geo = (struct hd_geometry *)arg;
1123 /* just fake some geometry here, it's nonsense anyway; to make it
1124 * easy, use Adaptec's usual 64/32 mapping */
1125 put_user( 64, &geo->heads );
1126 put_user( 32, &geo->sectors );
1127 put_user( acsi_info[dev].size >> 11, &geo->cylinders );
1128 put_user( acsi_part[MINOR(inode->i_rdev)].start_sect, &geo->start );
1132 case SCSI_IOCTL_GET_IDLUN:
1133 /* SCSI compatible GET_IDLUN call to get target's ID and LUN number */
1134 put_user( acsi_info[dev].target | (acsi_info[dev].lun << 8),
1135 &((Scsi_Idlun *) arg)->dev_id );
1136 put_user( 0, &((Scsi_Idlun *) arg)->host_unique_id );
1145 return blk_ioctl(inode->i_rdev, cmd, arg);
1147 case BLKRRPART: /* Re-read partition tables */
1148 if (!capable(CAP_SYS_ADMIN))
1150 return revalidate_acsidisk(inode->i_rdev, 1);
1159 * Open a device, check for read-only and lock the medium if it is
1162 * Changes by Martin Rogge, 9th Aug 1995:
1163 * Check whether check_disk_change (and therefore revalidate_acsidisk)
1164 * was successful. They fail when there is no medium in the drive.
1166 * The problem of media being changed during an operation can be
1167 * ignored because of the prevent_removal code.
1169 * Added check for the validity of the device number.
1173 static int acsi_open( struct inode * inode, struct file * filp )
1176 struct acsi_info_struct *aip;
1178 device = DEVICE_NR(MINOR(inode->i_rdev));
1179 if (device >= NDevices)
1181 aip = &acsi_info[device];
1182 while (busy[device])
1183 sleep_on(&busy_wait);
1185 if (access_count[device] == 0 && aip->removable) {
1187 aip->changed = 1; /* safety first */
1189 check_disk_change( inode->i_rdev );
1190 if (aip->changed) /* revalidate was not successful (no medium) */
1192 acsi_prevent_removal(device, 1);
1194 access_count[device]++;
1196 if (filp && filp->f_mode) {
1197 check_disk_change( inode->i_rdev );
1198 if (filp->f_mode & 2) {
1199 if (aip->read_only) {
1200 acsi_release( inode, filp );
1210 * Releasing a block device means we sync() it, so that it can safely
1211 * be forgotten about...
1214 static int acsi_release( struct inode * inode, struct file * file )
1216 int device = DEVICE_NR(MINOR(inode->i_rdev));
1217 if (--access_count[device] == 0 && acsi_info[device].removable)
1218 acsi_prevent_removal(device, 0);
1223 * Prevent or allow a media change for removable devices.
1226 static void acsi_prevent_removal(int device, int flag)
1228 stdma_lock( NULL, NULL );
1230 CMDSET_TARG_LUN(pa_med_rem_cmd, acsi_info[device].target,
1231 acsi_info[device].lun);
1232 CMDSET_LEN( pa_med_rem_cmd, flag );
1234 if (acsicmd_nodma(pa_med_rem_cmd, 0) && acsi_wait_for_IRQ(3*HZ))
1236 /* Do not report errors -- some devices may not know this command. */
1242 static int acsi_media_change (dev_t dev)
1244 int device = DEVICE_NR(MINOR(dev));
1245 struct acsi_info_struct *aip;
1247 aip = &acsi_info[device];
1248 if (!aip->removable)
1252 /* We can be sure that the medium has been changed -- REQUEST
1253 * SENSE has reported this earlier.
1257 /* If the flag isn't set, make a test by reading block 0.
1258 * If errors happen, it seems to be better to say "changed"...
1260 stdma_lock( NULL, NULL );
1261 CMDSET_TARG_LUN(read_cmd, aip->target, aip->lun);
1262 CMDSET_BLOCK( read_cmd, 0 );
1263 CMDSET_LEN( read_cmd, 1 );
1264 if (acsicmd_dma(read_cmd, acsi_buffer, 1, 0, 0) &&
1265 acsi_wait_for_IRQ(3*HZ)) {
1266 if (acsi_getstatus()) {
1267 if (acsi_reqsense(acsi_buffer, aip->target, aip->lun)) {
1268 if (CARTRCH_STAT(device, acsi_buffer))
1272 printk( KERN_ERR "ad%c: REQUEST SENSE failed in test for "
1273 "medium change; assuming a change\n", device + 'a' );
1279 printk( KERN_ERR "ad%c: Test for medium changed timed out; "
1280 "assuming a change\n", device + 'a');
1286 /* Now, after reading a block, the changed status is surely valid. */
1287 return aip->changed;
1291 static int acsi_change_blk_size( int target, int lun)
1295 for (i=0; i<12; i++)
1299 acsi_buffer[10] = 2;
1300 CMDSET_TARG_LUN( modeselect_cmd, target, lun);
1302 if (!acsicmd_dma( modeselect_cmd, acsi_buffer, 1,1,0) ||
1303 !acsi_wait_for_IRQ( 3*HZ ) ||
1304 acsi_getstatus() != 0 ) {
1311 static int acsi_mode_sense( int target, int lun, SENSE_DATA *sd )
1316 CMDSET_TARG_LUN( modesense_cmd, target, lun );
1317 for (page=0; page<4; page++) {
1318 modesense_cmd[2] = page;
1319 if (!acsicmd_dma( modesense_cmd, acsi_buffer, 1, 0, 0 ) ||
1320 !acsi_wait_for_IRQ( 3*HZ ) ||
1324 /* read twice to jump over the second 16-byte border! */
1326 if (acsi_wait_for_noIRQ( 20 ) &&
1327 acsicmd_nodma( modesense_cmd, 0 ) &&
1328 acsi_wait_for_IRQ( 3*HZ ) &&
1329 acsi_getstatus() == 0)
1336 dma_cache_maintenance( phys_acsi_buffer, sizeof(SENSE_DATA), 0 );
1337 *sd = *(SENSE_DATA *)acsi_buffer;
1339 /* Validity check, depending on type of data */
1341 switch( SENSE_TYPE(*sd) ) {
1343 case SENSE_TYPE_ATARI:
1344 if (CAPACITY(*sd) == 0)
1348 case SENSE_TYPE_SCSI:
1349 if (sd->scsi.descriptor_size != 8)
1353 case SENSE_TYPE_UNKNOWN:
1355 printk( KERN_ERR "ACSI target %d, lun %d: Cannot interpret "
1356 "sense data\n", target, lun );
1362 printk( "Mode sense data for ACSI target %d, lun %d seem not valid:",
1364 for( i = 0; i < sizeof(SENSE_DATA); ++i )
1365 printk( "%02x ", (unsigned char)acsi_buffer[i] );
1377 /*******************************************************************
1381 ********************************************************************/
1384 extern struct block_device_operations acsi_fops;
1386 static struct gendisk acsi_gendisk = {
1393 real_devices: (void *)acsi_info,
1397 #define MAX_SCSI_DEVICE_CODE 10
1399 static const char *const scsi_device_types[MAX_SCSI_DEVICE_CODE] =
1402 "Sequential-Access",
1413 static void print_inquiry(unsigned char *data)
1417 printk(KERN_INFO " Vendor: ");
1418 for (i = 8; i < 16; i++)
1420 if (data[i] >= 0x20 && i < data[4] + 5)
1421 printk("%c", data[i]);
1427 for (i = 16; i < 32; i++)
1429 if (data[i] >= 0x20 && i < data[4] + 5)
1430 printk("%c", data[i]);
1436 for (i = 32; i < 36; i++)
1438 if (data[i] >= 0x20 && i < data[4] + 5)
1439 printk("%c", data[i]);
1448 printk(KERN_INFO " Type: %s ", (i < MAX_SCSI_DEVICE_CODE
1449 ? scsi_device_types[i]
1451 printk(" ANSI SCSI revision: %02x", data[2] & 0x07);
1452 if ((data[2] & 0x07) == 1 && (data[3] & 0x0f) == 1)
1460 * Changes by Martin Rogge, 9th Aug 1995:
1461 * acsi_devinit has been taken out of acsi_geninit, because it needs
1462 * to be called from revalidate_acsidisk. The result of request sense
1463 * is now checked for DRIVE NOT READY.
1465 * The structure *aip is only valid when acsi_devinit returns
1471 #define DEV_UNKNOWN 1
1472 #define DEV_SUPPORTED 2
1475 static int acsi_devinit(struct acsi_info_struct *aip)
1477 int status, got_inquiry;
1479 unsigned char reqsense, extsense;
1481 /*****************************************************************/
1482 /* Do a TEST UNIT READY command to test the presence of a device */
1483 /*****************************************************************/
1485 CMDSET_TARG_LUN(tur_cmd, aip->target, aip->lun);
1486 if (!acsicmd_nodma(tur_cmd, 0)) {
1487 /* timed out -> no device here */
1489 printk("target %d lun %d: timeout\n", aip->target, aip->lun);
1494 /*************************/
1495 /* Read the ACSI status. */
1496 /*************************/
1498 status = acsi_getstatus();
1500 if (status == 0x12) {
1501 /* The SLM printer should be the only device that
1502 * responds with the error code in the status byte. In
1503 * correct status bytes, bit 4 is never set.
1505 printk( KERN_INFO "Detected SLM printer at id %d lun %d\n",
1506 aip->target, aip->lun);
1509 /* ignore CHECK CONDITION, since some devices send a
1511 if ((status & 0x1e) != 0x2) {
1513 printk("target %d lun %d: status %d\n",
1514 aip->target, aip->lun, status);
1520 /*******************************/
1521 /* Do a REQUEST SENSE command. */
1522 /*******************************/
1524 if (!acsi_reqsense(acsi_buffer, aip->target, aip->lun)) {
1525 printk( KERN_WARNING "acsi_reqsense failed\n");
1527 acsi_buffer[2] = UNIT_ATTENTION;
1529 reqsense = acsi_buffer[0];
1530 extsense = acsi_buffer[2] & 0xf;
1532 if ((reqsense & 0x70) == 0x70) { /* extended sense */
1533 if (extsense != UNIT_ATTENTION &&
1534 extsense != NOT_READY) {
1536 printk("target %d lun %d: extended sense %d\n",
1537 aip->target, aip->lun, extsense);
1543 if (reqsense & 0x7f) {
1545 printk("target %d lun %d: sense %d\n",
1546 aip->target, aip->lun, reqsense);
1553 if (reqsense == 0x4) { /* SH204 Bug workaround */
1555 printk("target %d lun %d status=0 sense=4\n",
1556 aip->target, aip->lun);
1561 /***********************************************************/
1562 /* Do an INQUIRY command to get more infos on this device. */
1563 /***********************************************************/
1565 /* Assume default values */
1568 aip->old_atari_disk = 0;
1569 aip->changed = (extsense == NOT_READY); /* medium inserted? */
1570 aip->size = DEFAULT_SIZE;
1572 /* Fake inquiry result for old atari disks */
1573 memcpy(acsi_buffer, "\000\000\001\000 Adaptec 40xx"
1575 CMDSET_TARG_LUN(inquiry_cmd, aip->target, aip->lun);
1576 if (acsicmd_dma(inquiry_cmd, acsi_buffer, 1, 0, 0) &&
1577 acsi_getstatus() == 0) {
1578 acsicmd_nodma(inquiry_cmd, 0);
1580 dma_cache_maintenance( phys_acsi_buffer, 256, 0 );
1582 aip->removable = !!(acsi_buffer[1] & 0x80);
1584 if (aip->type == NONE) /* only at boot time */
1585 print_inquiry(acsi_buffer);
1586 switch(acsi_buffer[0]) {
1588 aip->type = HARDDISK;
1597 /****************************/
1598 /* Do a MODE SENSE command. */
1599 /****************************/
1601 if (!acsi_mode_sense(aip->target, aip->lun, &sense)) {
1602 printk( KERN_WARNING "No mode sense data.\n" );
1605 if ((SECTOR_SIZE(sense) != 512) &&
1606 ((aip->type != CDROM) ||
1607 !acsi_change_blk_size(aip->target, aip->lun) ||
1608 !acsi_mode_sense(aip->target, aip->lun, &sense) ||
1609 (SECTOR_SIZE(sense) != 512))) {
1610 printk( KERN_WARNING "Sector size != 512 not supported.\n" );
1613 /* There are disks out there that claim to have 0 sectors... */
1614 if (CAPACITY(sense))
1615 aip->size = CAPACITY(sense); /* else keep DEFAULT_SIZE */
1616 if (!got_inquiry && SENSE_TYPE(sense) == SENSE_TYPE_ATARI) {
1617 /* If INQUIRY failed and the sense data suggest an old
1618 * Atari disk (SH20x, Megafile), the disk is not removable
1621 aip->old_atari_disk = 1;
1624 /******************/
1625 /* We've done it. */
1626 /******************/
1628 return DEV_SUPPORTED;
1631 EXPORT_SYMBOL(acsi_delay_start);
1632 EXPORT_SYMBOL(acsi_delay_end);
1633 EXPORT_SYMBOL(acsi_wait_for_IRQ);
1634 EXPORT_SYMBOL(acsi_wait_for_noIRQ);
1635 EXPORT_SYMBOL(acsicmd_nodma);
1636 EXPORT_SYMBOL(acsi_getstatus);
1637 EXPORT_SYMBOL(acsi_buffer);
1638 EXPORT_SYMBOL(phys_acsi_buffer);
1640 #ifdef CONFIG_ATARI_SLM_MODULE
1641 void acsi_attach_SLMs( int (*attach_func)( int, int ) );
1643 EXPORT_SYMBOL(acsi_extstatus);
1644 EXPORT_SYMBOL(acsi_end_extstatus);
1645 EXPORT_SYMBOL(acsi_extcmd);
1646 EXPORT_SYMBOL(acsi_attach_SLMs);
1648 /* to remember IDs of SLM devices, SLM module is loaded later
1649 * (index is target#, contents is lun#, -1 means "no SLM") */
1653 static struct block_device_operations acsi_fops = {
1656 release: acsi_release,
1658 check_media_change: acsi_media_change,
1659 revalidate: acsi_revalidate,
1662 static void acsi_geninit(void)
1665 struct acsi_info_struct *aip;
1666 #ifdef CONFIG_ATARI_SLM
1670 printk( KERN_INFO "Probing ACSI devices:\n" );
1672 #ifdef CONFIG_ATARI_SLM_MODULE
1673 for( i = 0; i < 8; ++i )
1674 SLM_devices[i] = -1;
1676 stdma_lock(NULL, NULL);
1678 for (target = 0; target < 8 && NDevices < MAX_DEV; ++target) {
1681 aip = &acsi_info[NDevices];
1683 aip->target = target;
1685 i = acsi_devinit(aip);
1688 printk( KERN_INFO "Detected ");
1689 switch (aip->type) {
1698 printk(" ad%c at id %d lun %d ",
1699 'a' + NDevices, target, lun);
1701 printk("(removable) ");
1703 printk("(read-only) ");
1704 if (aip->size == DEFAULT_SIZE)
1705 printk(" unkown size, using default ");
1706 printk("%ld MByte\n",
1707 (aip->size*512+1024*1024/2)/(1024*1024));
1711 #ifdef CONFIG_ATARI_SLM
1712 n_slm += attach_slm( target, lun );
1715 #ifdef CONFIG_ATARI_SLM_MODULE
1716 SLM_devices[target] = lun;
1719 /* neither of the above: fall through to unknown device */
1721 printk( KERN_INFO "Detected unsupported device at "
1722 "id %d lun %d\n", target, lun);
1726 #ifdef CONFIG_ACSI_MULTI_LUN
1727 while (i != DEV_NONE && ++lun < MAX_LUN);
1733 /* reenable interrupt */
1737 #ifndef CONFIG_ATARI_SLM
1738 printk( KERN_INFO "Found %d ACSI device(s) total.\n", NDevices );
1740 printk( KERN_INFO "Found %d ACSI device(s) and %d SLM printer(s) total.\n",
1744 for( i = 0; i < (MAX_DEV << 4); i++ )
1745 acsi_blocksizes[i] = 1024;
1746 blksize_size[MAJOR_NR] = acsi_blocksizes;
1747 for( i = 0; i < NDevices; ++i )
1748 register_disk(&acsi_gendisk, MKDEV(MAJOR_NR,i<<4),
1749 (acsi_info[i].type==HARDDISK)?1<<4:1,
1752 acsi_gendisk.nr_real = NDevices;
1755 #ifdef CONFIG_ATARI_SLM_MODULE
1756 /* call attach_slm() for each device that is a printer; needed for init of SLM
1757 * driver as a module, since it's not yet present if acsi.c is inited and thus
1758 * the bus gets scanned. */
1759 void acsi_attach_SLMs( int (*attach_func)( int, int ) )
1763 for( i = 0; i < 8; ++i )
1764 if (SLM_devices[i] >= 0)
1765 n += (*attach_func)( i, SLM_devices[i] );
1766 printk( KERN_INFO "Found %d SLM printer(s) total.\n", n );
1768 #endif /* CONFIG_ATARI_SLM_MODULE */
1771 int acsi_init( void )
1775 if (!MACH_IS_ATARI || !ATARIHW_PRESENT(ACSI))
1777 if (devfs_register_blkdev( MAJOR_NR, "ad", &acsi_fops )) {
1778 printk( KERN_ERR "Unable to get major %d for ACSI\n", MAJOR_NR );
1782 (char *)atari_stram_alloc(ACSI_BUFFER_SIZE, "acsi"))) {
1783 printk( KERN_ERR "Unable to get ACSI ST-Ram buffer.\n" );
1784 devfs_unregister_blkdev( MAJOR_NR, "ad" );
1787 phys_acsi_buffer = virt_to_phys( acsi_buffer );
1788 STramMask = ATARIHW_PRESENT(EXTD_DMA) ? 0x00000000 : 0xff000000;
1790 blk_init_queue(BLK_DEFAULT_QUEUE(MAJOR_NR), DEVICE_REQUEST);
1791 read_ahead[MAJOR_NR] = 8; /* 8 sector (4kB) read-ahead */
1792 add_gendisk(&acsi_gendisk);
1794 #ifdef CONFIG_ATARI_SLM
1805 MODULE_LICENSE("GPL");
1807 int init_module(void)
1811 if ((err = acsi_init()))
1813 printk( KERN_INFO "ACSI driver loaded as module.\n");
1817 void cleanup_module(void)
1819 del_timer( &acsi_timer );
1820 blk_cleanup_queue(BLK_DEFAULT_QUEUE(MAJOR_NR));
1821 atari_stram_free( acsi_buffer );
1823 if (devfs_unregister_blkdev( MAJOR_NR, "ad" ) != 0)
1824 printk( KERN_ERR "acsi: cleanup_module failed\n");
1826 del_gendisk(&acsi_gendisk);
1830 #define DEVICE_BUSY busy[device]
1831 #define USAGE access_count[device]
1832 #define GENDISK_STRUCT acsi_gendisk
1835 * This routine is called to flush all partitions and partition tables
1836 * for a changed scsi disk, and then re-read the new partition table.
1837 * If we are revalidating a disk because of a media change, then we
1838 * enter with usage == 0. If we are using an ioctl, we automatically have
1839 * usage == 1 (we need an open channel to use an ioctl :-), so this
1842 * Changes by Martin Rogge, 9th Aug 1995:
1843 * got cd-roms to work by calling acsi_devinit. There are only two problems:
1844 * First, if there is no medium inserted, the status will remain "changed".
1845 * That is no problem at all, but our design of three-valued logic (medium
1846 * changed, medium not changed, no medium inserted).
1847 * Secondly the check could fail completely and the drive could deliver
1848 * nonsensical data, which could mess up the acsi_info[] structure. In
1849 * that case we try to make the entry safe.
1853 static int revalidate_acsidisk( int dev, int maxusage )
1856 struct gendisk * gdev;
1857 int max_p, start, i;
1858 struct acsi_info_struct *aip;
1860 device = DEVICE_NR(MINOR(dev));
1861 aip = &acsi_info[device];
1862 gdev = &GENDISK_STRUCT;
1865 if (DEVICE_BUSY || USAGE > maxusage) {
1872 max_p = gdev->max_p;
1873 start = device << gdev->minor_shift;
1875 for( i = max_p - 1; i >= 0 ; i-- ) {
1876 if (gdev->part[start + i].nr_sects != 0) {
1877 invalidate_device(MKDEV(MAJOR_NR, start + i), 1);
1878 gdev->part[start + i].nr_sects = 0;
1880 gdev->part[start+i].start_sect = 0;
1883 stdma_lock( NULL, NULL );
1885 if (acsi_devinit(aip) != DEV_SUPPORTED) {
1886 printk( KERN_ERR "ACSI: revalidate failed for target %d lun %d\n",
1887 aip->target, aip->lun);
1891 aip->changed = 1; /* next acsi_open will try again... */
1897 grok_partitions(gdev, device, (aip->type==HARDDISK)?1<<4:1, aip->size);
1900 wake_up(&busy_wait);
1905 static int acsi_revalidate (dev_t dev)
1907 return revalidate_acsidisk (dev, 0);