File: /usr/src/linux/drivers/block/acsi.c
1 /*
2 * acsi.c -- Device driver for Atari ACSI hard disks
3 *
4 * Copyright 1994 Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de>
5 *
6 * Some parts are based on hd.c by Linus Torvalds
7 *
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
10 * more details.
11 *
12 */
13
14 /*
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 :-(
22 */
23
24 /*
25 * General notes:
26 *
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.
43 *
44 */
45
46 #define MAJOR_NR ACSI_MAJOR
47
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>
54 #include <linux/fs.h>
55 #include <linux/kernel.h>
56 #include <linux/genhd.h>
57 #include <linux/devfs_fs_kernel.h>
58 #include <linux/delay.h>
59 #include <linux/mm.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>
69
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>
79
80
81 #define DEBUG
82 #undef DEBUG_DETECT
83 #undef NO_WRITE
84
85 #define MAX_ERRORS 8 /* Max read/write errors/sector */
86 #define MAX_LUN 8 /* Max LUNs per target */
87 #define MAX_DEV 16
88
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)
94
95 #define ACSI_BUFFER_ORDER \
96 (ATARIHW_PRESENT(EXTD_DMA) ? \
97 ACSI_BUFFER_MINSIZE_ORDER : \
98 ACSI_BUFFER_SIZE_ORDER)
99
100 #define ACSI_TIMEOUT (4*HZ)
101
102 /* minimum delay between two commands */
103
104 #define COMMAND_DELAY 500
105
106 typedef enum {
107 NONE, HARDDISK, CDROM
108 } ACSI_TYPE;
109
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];
120
121 /*
122 * SENSE KEYS
123 */
124
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
138
139
140 /*
141 * DEVICE TYPES
142 */
143
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
150
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.
154 */
155
156 typedef struct {
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;
164 unsigned char heads;
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;
171 unsigned char type;
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;
179 } ATARI_SENSE_DATA;
180
181 #define ATARI_CAPACITY(sd) \
182 (((int)((sd).cylinders_h<<8)|(sd).cylinders_l) * \
183 (sd).heads * (sd).sectors)
184
185
186 typedef struct {
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;
193 /* Page 0 data */
194 unsigned char page_code;
195 unsigned char page_size;
196 unsigned char page_flags;
197 unsigned char qualifier;
198 } SCSI_SENSE_DATA;
199
200 #define SCSI_CAPACITY(sd) ((sd).block_count & 0xffffff)
201
202
203 typedef union {
204 ATARI_SENSE_DATA atari;
205 SCSI_SENSE_DATA scsi;
206 } SENSE_DATA;
207
208 #define SENSE_TYPE_UNKNOWN 0
209 #define SENSE_TYPE_ATARI 1
210 #define SENSE_TYPE_SCSI 2
211
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 : \
217 SENSE_TYPE_UNKNOWN)
218
219 #define CAPACITY(sd) \
220 (SENSE_TYPE(sd) == SENSE_TYPE_ATARI ? \
221 ATARI_CAPACITY((sd).atari) : \
222 SCSI_CAPACITY((sd).scsi))
223
224 #define SECTOR_SIZE(sd) \
225 (SENSE_TYPE(sd) == SENSE_TYPE_ATARI ? \
226 (sd).atari.sector_size : \
227 (sd).scsi.sector_size & 0xffffff)
228
229 /* Default size if capacity cannot be determined (1 GByte) */
230 #define DEFAULT_SIZE 0x1fffff
231
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))) \
238
239 /* These two are also exported to other drivers that work on the ACSI bus and
240 * need an ST-RAM buffer. */
241 char *acsi_buffer;
242 unsigned long phys_acsi_buffer;
243
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);
251
252 static int CurrentNReq;
253 static int CurrentNSect;
254 static char *CurrentBuffer;
255
256
257 #define SET_TIMER() mod_timer(&acsi_timer, jiffies + ACSI_TIMEOUT)
258 #define CLEAR_TIMER() del_timer(&acsi_timer)
259
260 static unsigned long STramMask;
261 #define STRAM_ADDR(a) (((a) & STramMask) == 0)
262
263
264
265 /* ACSI commands */
266
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 };
275
276 #define CMDSET_TARG_LUN(cmd,targ,lun) \
277 do { \
278 cmd[0] = (cmd[0] & ~0xe0) | (targ)<<5; \
279 cmd[1] = (cmd[1] & ~0xe0) | (lun)<<5; \
280 } while(0)
281
282 #define CMDSET_BLOCK(cmd,blk) \
283 do { \
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); \
288 } while(0)
289
290 #define CMDSET_LEN(cmd,len) \
291 do { \
292 cmd[4] = (len); \
293 } while(0)
294
295 /* ACSI errors (from REQUEST SENSE); There are two tables, one for the
296 * old Atari disks and one for SCSI on ACSI disks.
297 */
298
299 struct acsi_error {
300 unsigned char code;
301 const char *text;
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" }
328 },
329
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" }
342 };
343
344
345
346 /***************************** Prototypes *****************************/
347
348 static int acsicmd_dma( const char *cmd, char *buffer, int blocks, int
349 rwflag, int enable);
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);
373
374 /************************* End of Prototypes **************************/
375
376
377 struct timer_list acsi_timer = { NULL, NULL, 0, 0, acsi_times_out };
378
379
380 #ifdef CONFIG_ATARI_SLM
381
382 extern int attach_slm( int target, int lun );
383 extern int slm_init( void );
384
385 #endif
386
387
388
389 /***********************************************************************
390 *
391 * ACSI primitives
392 *
393 **********************************************************************/
394
395
396 /*
397 * The following two functions wait for _IRQ to become Low or High,
398 * resp., with a timeout. The 'timeout' parameter is in jiffies
399 * (10ms).
400 * If the functions are called with timer interrupts on (int level <
401 * 6), the timeout is based on the 'jiffies' variable to provide exact
402 * timeouts for device probing etc.
403 * If interrupts are disabled, the number of tries is based on the
404 * 'loops_per_jiffy' variable. A rough estimation is sufficient here...
405 */
406
407 #define INT_LEVEL \
408 ({ unsigned __sr; \
409 __asm__ __volatile__ ( "movew %/sr,%0" : "=dm" (__sr) ); \
410 (__sr >> 8) & 7; \
411 })
412
413 int acsi_wait_for_IRQ( unsigned timeout )
414
415 {
416 if (INT_LEVEL < 6) {
417 unsigned long maxjif = jiffies + timeout;
418 while (time_before(jiffies, maxjif))
419 if (!(mfp.par_dt_reg & 0x20)) return( 1 );
420 }
421 else {
422 long tries = loops_per_jiffy / 8 * timeout;
423 while( --tries >= 0 )
424 if (!(mfp.par_dt_reg & 0x20)) return( 1 );
425 }
426 return( 0 ); /* timeout! */
427 }
428
429
430 int acsi_wait_for_noIRQ( unsigned timeout )
431
432 {
433 if (INT_LEVEL < 6) {
434 unsigned long maxjif = jiffies + timeout;
435 while (time_before(jiffies, maxjif))
436 if (mfp.par_dt_reg & 0x20) return( 1 );
437 }
438 else {
439 long tries = loops_per_jiffy * timeout / 8;
440 while( tries-- >= 0 )
441 if (mfp.par_dt_reg & 0x20) return( 1 );
442 }
443 return( 0 ); /* timeout! */
444 }
445
446 static struct timeval start_time;
447
448 void
449 acsi_delay_start(void)
450 {
451 do_gettimeofday(&start_time);
452 }
453
454 /* wait from acsi_delay_start to now usec (<1E6) usec */
455
456 void
457 acsi_delay_end(long usec)
458 {
459 struct timeval end_time;
460 long deltau,deltas;
461 do_gettimeofday(&end_time);
462 deltau=end_time.tv_usec - start_time.tv_usec;
463 deltas=end_time.tv_sec - start_time.tv_sec;
464 if (deltas > 1 || deltas < 0)
465 return;
466 if (deltas > 0)
467 deltau += 1000*1000;
468 if (deltau >= usec)
469 return;
470 udelay(usec-deltau);
471 }
472
473 /* acsicmd_dma() sends an ACSI command and sets up the DMA to transfer
474 * 'blocks' blocks of 512 bytes from/to 'buffer'.
475 * Because the _IRQ signal is used for handshaking the command bytes,
476 * the ACSI interrupt has to be disabled in this function. If the end
477 * of the operation should be signalled by a real interrupt, it has to be
478 * reenabled afterwards.
479 */
480
481 static int acsicmd_dma( const char *cmd, char *buffer, int blocks, int rwflag, int enable)
482
483 { unsigned long flags, paddr;
484 int i;
485
486 #ifdef NO_WRITE
487 if (rwflag || *cmd == 0x0a) {
488 printk( "ACSI: Write commands disabled!\n" );
489 return( 0 );
490 }
491 #endif
492
493 rwflag = rwflag ? 0x100 : 0;
494 paddr = virt_to_phys( buffer );
495
496 acsi_delay_end(COMMAND_DELAY);
497 DISABLE_IRQ();
498
499 save_flags(flags);
500 cli();
501 /* Low on A1 */
502 dma_wd.dma_mode_status = 0x88 | rwflag;
503 MFPDELAY();
504
505 /* set DMA address */
506 dma_wd.dma_lo = (unsigned char)paddr;
507 paddr >>= 8;
508 MFPDELAY();
509 dma_wd.dma_md = (unsigned char)paddr;
510 paddr >>= 8;
511 MFPDELAY();
512 if (ATARIHW_PRESENT(EXTD_DMA))
513 st_dma_ext_dmahi = (unsigned short)paddr;
514 else
515 dma_wd.dma_hi = (unsigned char)paddr;
516 MFPDELAY();
517 restore_flags(flags);
518
519 /* send the command bytes except the last */
520 for( i = 0; i < 5; ++i ) {
521 DMA_LONG_WRITE( *cmd++, 0x8a | rwflag );
522 udelay(20);
523 if (!acsi_wait_for_IRQ( HZ/2 )) return( 0 ); /* timeout */
524 }
525
526 /* Clear FIFO and switch DMA to correct direction */
527 dma_wd.dma_mode_status = 0x92 | (rwflag ^ 0x100);
528 MFPDELAY();
529 dma_wd.dma_mode_status = 0x92 | rwflag;
530 MFPDELAY();
531
532 /* How many sectors for DMA */
533 dma_wd.fdc_acces_seccount = blocks;
534 MFPDELAY();
535
536 /* send last command byte */
537 dma_wd.dma_mode_status = 0x8a | rwflag;
538 MFPDELAY();
539 DMA_LONG_WRITE( *cmd++, 0x0a | rwflag );
540 if (enable)
541 ENABLE_IRQ();
542 udelay(80);
543
544 return( 1 );
545 }
546
547
548 /*
549 * acsicmd_nodma() sends an ACSI command that requires no DMA.
550 */
551
552 int acsicmd_nodma( const char *cmd, int enable)
553
554 { int i;
555
556 acsi_delay_end(COMMAND_DELAY);
557 DISABLE_IRQ();
558
559 /* send first command byte */
560 dma_wd.dma_mode_status = 0x88;
561 MFPDELAY();
562 DMA_LONG_WRITE( *cmd++, 0x8a );
563 udelay(20);
564 if (!acsi_wait_for_IRQ( HZ/2 )) return( 0 ); /* timeout */
565
566 /* send the intermediate command bytes */
567 for( i = 0; i < 4; ++i ) {
568 DMA_LONG_WRITE( *cmd++, 0x8a );
569 udelay(20);
570 if (!acsi_wait_for_IRQ( HZ/2 )) return( 0 ); /* timeout */
571 }
572
573 /* send last command byte */
574 DMA_LONG_WRITE( *cmd++, 0x0a );
575 if (enable)
576 ENABLE_IRQ();
577 udelay(80);
578
579 return( 1 );
580 /* Note that the ACSI interrupt is still disabled after this
581 * function. If you want to get the IRQ delivered, enable it manually!
582 */
583 }
584
585
586 static int acsi_reqsense( char *buffer, int targ, int lun)
587
588 {
589 CMDSET_TARG_LUN( reqsense_cmd, targ, lun);
590 if (!acsicmd_dma( reqsense_cmd, buffer, 1, 0, 0 )) return( 0 );
591 if (!acsi_wait_for_IRQ( 10 )) return( 0 );
592 acsi_getstatus();
593 if (!acsicmd_nodma( reqsense_cmd, 0 )) return( 0 );
594 if (!acsi_wait_for_IRQ( 10 )) return( 0 );
595 acsi_getstatus();
596 if (!acsicmd_nodma( reqsense_cmd, 0 )) return( 0 );
597 if (!acsi_wait_for_IRQ( 10 )) return( 0 );
598 acsi_getstatus();
599 if (!acsicmd_nodma( reqsense_cmd, 0 )) return( 0 );
600 if (!acsi_wait_for_IRQ( 10 )) return( 0 );
601 acsi_getstatus();
602 dma_cache_maintenance( virt_to_phys(buffer), 16, 0 );
603
604 return( 1 );
605 }
606
607
608 /*
609 * ACSI status phase: get the status byte from the bus
610 *
611 * I've seen several times that a 0xff status is read, propably due to
612 * a timing error. In this case, the procedure is repeated after the
613 * next _IRQ edge.
614 */
615
616 int acsi_getstatus( void )
617
618 { int status;
619
620 DISABLE_IRQ();
621 for(;;) {
622 if (!acsi_wait_for_IRQ( 100 )) {
623 acsi_delay_start();
624 return( -1 );
625 }
626 dma_wd.dma_mode_status = 0x8a;
627 MFPDELAY();
628 status = dma_wd.fdc_acces_seccount;
629 if (status != 0xff) break;
630 #ifdef DEBUG
631 printk("ACSI: skipping 0xff status byte\n" );
632 #endif
633 udelay(40);
634 acsi_wait_for_noIRQ( 20 );
635 }
636 dma_wd.dma_mode_status = 0x80;
637 udelay(40);
638 acsi_wait_for_noIRQ( 20 );
639
640 acsi_delay_start();
641 return( status & 0x1f ); /* mask of the device# */
642 }
643
644
645 #if (defined(CONFIG_ATARI_SLM) || defined(CONFIG_ATARI_SLM_MODULE))
646
647 /* Receive data in an extended status phase. Needed by SLM printer. */
648
649 int acsi_extstatus( char *buffer, int cnt )
650
651 { int status;
652
653 DISABLE_IRQ();
654 udelay(80);
655 while( cnt-- > 0 ) {
656 if (!acsi_wait_for_IRQ( 40 )) return( 0 );
657 dma_wd.dma_mode_status = 0x8a;
658 MFPDELAY();
659 status = dma_wd.fdc_acces_seccount;
660 MFPDELAY();
661 *buffer++ = status & 0xff;
662 udelay(40);
663 }
664 return( 1 );
665 }
666
667
668 /* Finish an extended status phase */
669
670 void acsi_end_extstatus( void )
671
672 {
673 dma_wd.dma_mode_status = 0x80;
674 udelay(40);
675 acsi_wait_for_noIRQ( 20 );
676 acsi_delay_start();
677 }
678
679
680 /* Send data in an extended command phase */
681
682 int acsi_extcmd( unsigned char *buffer, int cnt )
683
684 {
685 while( cnt-- > 0 ) {
686 DMA_LONG_WRITE( *buffer++, 0x8a );
687 udelay(20);
688 if (!acsi_wait_for_IRQ( HZ/2 )) return( 0 ); /* timeout */
689 }
690 return( 1 );
691 }
692
693 #endif
694
695
696 static void acsi_print_error( const unsigned char *errblk, int dev )
697
698 { int atari_err, i, errcode;
699 struct acsi_error *arr;
700
701 atari_err = acsi_info[dev].old_atari_disk;
702 if (atari_err)
703 errcode = errblk[0] & 0x7f;
704 else
705 if ((errblk[0] & 0x70) == 0x70)
706 errcode = errblk[2] & 0x0f;
707 else
708 errcode = errblk[0] & 0x0f;
709
710 printk( KERN_ERR "ACSI error 0x%02x", errcode );
711
712 if (errblk[0] & 0x80)
713 printk( " for sector %d",
714 ((errblk[1] & 0x1f) << 16) |
715 (errblk[2] << 8) | errblk[0] );
716
717 arr = atari_err ? atari_acsi_errors : scsi_acsi_errors;
718 i = atari_err ? sizeof(atari_acsi_errors)/sizeof(*atari_acsi_errors) :
719 sizeof(scsi_acsi_errors)/sizeof(*scsi_acsi_errors);
720
721 for( --i; i >= 0; --i )
722 if (arr[i].code == errcode) break;
723 if (i >= 0)
724 printk( ": %s\n", arr[i].text );
725 }
726
727 /*******************************************************************
728 *
729 * ACSI interrupt routine
730 * Test, if this is a ACSI interrupt and call the irq handler
731 * Otherwise ignore this interrupt.
732 *
733 *******************************************************************/
734
735 static void acsi_interrupt(int irq, void *data, struct pt_regs *fp )
736
737 { void (*acsi_irq_handler)(void) = DEVICE_INTR;
738
739 DEVICE_INTR = NULL;
740 CLEAR_TIMER();
741
742 if (!acsi_irq_handler)
743 acsi_irq_handler = unexpected_acsi_interrupt;
744 acsi_irq_handler();
745 }
746
747
748 /******************************************************************
749 *
750 * The Interrupt handlers
751 *
752 *******************************************************************/
753
754
755 static void unexpected_acsi_interrupt( void )
756
757 {
758 printk( KERN_WARNING "Unexpected ACSI interrupt\n" );
759 }
760
761
762 /* This function is called in case of errors. Because we cannot reset
763 * the ACSI bus or a single device, there is no other choice than
764 * retrying several times :-(
765 */
766
767 static void bad_rw_intr( void )
768
769 {
770 if (QUEUE_EMPTY)
771 return;
772
773 if (++CURRENT->errors >= MAX_ERRORS)
774 end_request(0);
775 /* Otherwise just retry */
776 }
777
778
779 static void read_intr( void )
780
781 { int status;
782
783 status = acsi_getstatus();
784 if (status != 0) {
785 int dev = DEVICE_NR(MINOR(CURRENT->rq_dev));
786 printk( KERN_ERR "ad%c: ", dev+'a' );
787 if (!acsi_reqsense( acsi_buffer, acsi_info[dev].target,
788 acsi_info[dev].lun))
789 printk( "ACSI error and REQUEST SENSE failed (status=0x%02x)\n", status );
790 else {
791 acsi_print_error( acsi_buffer, dev );
792 if (CARTRCH_STAT( dev, acsi_buffer ))
793 acsi_info[dev].changed = 1;
794 }
795 ENABLE_IRQ();
796 bad_rw_intr();
797 redo_acsi_request();
798 return;
799 }
800
801 dma_cache_maintenance( virt_to_phys(CurrentBuffer), CurrentNSect*512, 0 );
802 if (CurrentBuffer == acsi_buffer)
803 copy_from_acsibuffer();
804
805 do_end_requests();
806 redo_acsi_request();
807 }
808
809
810 static void write_intr(void)
811
812 { int status;
813
814 status = acsi_getstatus();
815 if (status != 0) {
816 int dev = DEVICE_NR(MINOR(CURRENT->rq_dev));
817 printk( KERN_ERR "ad%c: ", dev+'a' );
818 if (!acsi_reqsense( acsi_buffer, acsi_info[dev].target,
819 acsi_info[dev].lun))
820 printk( "ACSI error and REQUEST SENSE failed (status=0x%02x)\n", status );
821 else {
822 acsi_print_error( acsi_buffer, dev );
823 if (CARTRCH_STAT( dev, acsi_buffer ))
824 acsi_info[dev].changed = 1;
825 }
826 bad_rw_intr();
827 redo_acsi_request();
828 return;
829 }
830
831 do_end_requests();
832 redo_acsi_request();
833 }
834
835
836 static void acsi_times_out( unsigned long dummy )
837
838 {
839 DISABLE_IRQ();
840 if (!DEVICE_INTR) return;
841
842 DEVICE_INTR = NULL;
843 printk( KERN_ERR "ACSI timeout\n" );
844 if (QUEUE_EMPTY) return;
845 if (++CURRENT->errors >= MAX_ERRORS) {
846 #ifdef DEBUG
847 printk( KERN_ERR "ACSI: too many errors.\n" );
848 #endif
849 end_request(0);
850 }
851
852 redo_acsi_request();
853 }
854
855
856
857 /***********************************************************************
858 *
859 * Scatter-gather utility functions
860 *
861 ***********************************************************************/
862
863
864 static void copy_to_acsibuffer( void )
865
866 { int i;
867 char *src, *dst;
868 struct buffer_head *bh;
869
870 src = CURRENT->buffer;
871 dst = acsi_buffer;
872 bh = CURRENT->bh;
873
874 if (!bh)
875 memcpy( dst, src, CurrentNSect*512 );
876 else
877 for( i = 0; i < CurrentNReq; ++i ) {
878 memcpy( dst, src, bh->b_size );
879 dst += bh->b_size;
880 if ((bh = bh->b_reqnext))
881 src = bh->b_data;
882 }
883 }
884
885
886 static void copy_from_acsibuffer( void )
887
888 { int i;
889 char *src, *dst;
890 struct buffer_head *bh;
891
892 dst = CURRENT->buffer;
893 src = acsi_buffer;
894 bh = CURRENT->bh;
895
896 if (!bh)
897 memcpy( dst, src, CurrentNSect*512 );
898 else
899 for( i = 0; i < CurrentNReq; ++i ) {
900 memcpy( dst, src, bh->b_size );
901 src += bh->b_size;
902 if ((bh = bh->b_reqnext))
903 dst = bh->b_data;
904 }
905 }
906
907
908 static void do_end_requests( void )
909
910 { int i, n;
911
912 if (!CURRENT->bh) {
913 CURRENT->nr_sectors -= CurrentNSect;
914 CURRENT->current_nr_sectors -= CurrentNSect;
915 CURRENT->sector += CurrentNSect;
916 if (CURRENT->nr_sectors == 0)
917 end_request(1);
918 }
919 else {
920 for( i = 0; i < CurrentNReq; ++i ) {
921 n = CURRENT->bh->b_size >> 9;
922 CURRENT->nr_sectors -= n;
923 CURRENT->current_nr_sectors -= n;
924 CURRENT->sector += n;
925 end_request(1);
926 }
927 }
928 }
929
930
931
932
933 /***********************************************************************
934 *
935 * do_acsi_request and friends
936 *
937 ***********************************************************************/
938
939 static void do_acsi_request( request_queue_t * q )
940
941 {
942 stdma_lock( acsi_interrupt, NULL );
943 redo_acsi_request();
944 }
945
946
947 static void redo_acsi_request( void )
948
949 { unsigned block, dev, target, lun, nsect;
950 char *buffer;
951 unsigned long pbuffer;
952 struct buffer_head *bh;
953
954 if (!QUEUE_EMPTY && CURRENT->rq_status == RQ_INACTIVE) {
955 if (!DEVICE_INTR) {
956 ENABLE_IRQ();
957 stdma_release();
958 }
959 return;
960 }
961
962 if (DEVICE_INTR)
963 return;
964
965 repeat:
966 CLEAR_TIMER();
967 /* Another check here: An interrupt or timer event could have
968 * happened since the last check!
969 */
970 if (!QUEUE_EMPTY && CURRENT->rq_status == RQ_INACTIVE) {
971 if (!DEVICE_INTR) {
972 ENABLE_IRQ();
973 stdma_release();
974 }
975 return;
976 }
977 if (DEVICE_INTR)
978 return;
979
980 if (QUEUE_EMPTY) {
981 CLEAR_INTR;
982 ENABLE_IRQ();
983 stdma_release();
984 return;
985 }
986
987 if (MAJOR(CURRENT->rq_dev) != MAJOR_NR)
988 panic(DEVICE_NAME ": request list destroyed");
989 if (CURRENT->bh) {
990 if (!CURRENT->bh && !buffer_locked(CURRENT->bh))
991 panic(DEVICE_NAME ": block not locked");
992 }
993
994 dev = MINOR(CURRENT->rq_dev);
995 block = CURRENT->sector;
996 if (DEVICE_NR(dev) >= NDevices ||
997 block+CURRENT->nr_sectors >= acsi_part[dev].nr_sects) {
998 #ifdef DEBUG
999 printk( "ad%c: attempted access for blocks %d...%ld past end of device at block %ld.\n",
1000 DEVICE_NR(dev)+'a',
1001 block, block + CURRENT->nr_sectors - 1,
1002 acsi_part[dev].nr_sects);
1003 #endif
1004 end_request(0);
1005 goto repeat;
1006 }
1007 if (acsi_info[DEVICE_NR(dev)].changed) {
1008 printk( KERN_NOTICE "ad%c: request denied because cartridge has "
1009 "been changed.\n", DEVICE_NR(dev)+'a' );
1010 end_request(0);
1011 goto repeat;
1012 }
1013
1014 block += acsi_part[dev].start_sect;
1015 target = acsi_info[DEVICE_NR(dev)].target;
1016 lun = acsi_info[DEVICE_NR(dev)].lun;
1017
1018 /* Find out how many sectors should be transferred from/to
1019 * consecutive buffers and thus can be done with a single command.
1020 */
1021 buffer = CURRENT->buffer;
1022 pbuffer = virt_to_phys(buffer);
1023 nsect = CURRENT->current_nr_sectors;
1024 CurrentNReq = 1;
1025
1026 if ((bh = CURRENT->bh) && bh != CURRENT->bhtail) {
1027 if (!STRAM_ADDR(pbuffer)) {
1028 /* If transfer is done via the ACSI buffer anyway, we can
1029 * assemble as much bh's as fit in the buffer.
1030 */
1031 while( (bh = bh->b_reqnext) ) {
1032 if (nsect + (bh->b_size>>9) > ACSI_BUFFER_SECTORS) break;
1033 nsect += bh->b_size >> 9;
1034 ++CurrentNReq;
1035 if (bh == CURRENT->bhtail) break;
1036 }
1037 buffer = acsi_buffer;
1038 pbuffer = phys_acsi_buffer;
1039 }
1040 else {
1041 unsigned long pendadr, pnewadr;
1042 pendadr = pbuffer + nsect*512;
1043 while( (bh = bh->b_reqnext) ) {
1044 pnewadr = virt_to_phys(bh->b_data);
1045 if (!STRAM_ADDR(pnewadr) || pendadr != pnewadr) break;
1046 nsect += bh->b_size >> 9;
1047 pendadr = pnewadr + bh->b_size;
1048 ++CurrentNReq;
1049 if (bh == CURRENT->bhtail) break;
1050 }
1051 }
1052 }
1053 else {
1054 if (!STRAM_ADDR(pbuffer)) {
1055 buffer = acsi_buffer;
1056 pbuffer = phys_acsi_buffer;
1057 if (nsect > ACSI_BUFFER_SECTORS)
1058 nsect = ACSI_BUFFER_SECTORS;
1059 }
1060 }
1061 CurrentBuffer = buffer;
1062 CurrentNSect = nsect;
1063
1064 if (CURRENT->cmd == WRITE) {
1065 CMDSET_TARG_LUN( write_cmd, target, lun );
1066 CMDSET_BLOCK( write_cmd, block );
1067 CMDSET_LEN( write_cmd, nsect );
1068 if (buffer == acsi_buffer)
1069 copy_to_acsibuffer();
1070 dma_cache_maintenance( pbuffer, nsect*512, 1 );
1071 SET_INTR(write_intr);
1072 if (!acsicmd_dma( write_cmd, buffer, nsect, 1, 1)) {
1073 CLEAR_INTR;
1074 printk( KERN_ERR "ACSI (write): Timeout in command block\n" );
1075 bad_rw_intr();
1076 goto repeat;
1077 }
1078 SET_TIMER();
1079 return;
1080 }
1081 if (CURRENT->cmd == READ) {
1082 CMDSET_TARG_LUN( read_cmd, target, lun );
1083 CMDSET_BLOCK( read_cmd, block );
1084 CMDSET_LEN( read_cmd, nsect );
1085 SET_INTR(read_intr);
1086 if (!acsicmd_dma( read_cmd, buffer, nsect, 0, 1)) {
1087 CLEAR_INTR;
1088 printk( KERN_ERR "ACSI (read): Timeout in command block\n" );
1089 bad_rw_intr();
1090 goto repeat;
1091 }
1092 SET_TIMER();
1093 return;
1094 }
1095 panic("unknown ACSI command");
1096 }
1097
1098
1099
1100 /***********************************************************************
1101 *
1102 * Misc functions: ioctl, open, release, check_change, ...
1103 *
1104 ***********************************************************************/
1105
1106
1107 static int acsi_ioctl( struct inode *inode, struct file *file,
1108 unsigned int cmd, unsigned long arg )
1109 { int dev;
1110
1111 if (!inode)
1112 return -EINVAL;
1113 dev = DEVICE_NR(MINOR(inode->i_rdev));
1114 if (dev >= NDevices)
1115 return -EINVAL;
1116 switch (cmd) {
1117 case HDIO_GETGEO:
1118 /* HDIO_GETGEO is supported more for getting the partition's
1119 * start sector... */
1120 { struct hd_geometry *geo = (struct hd_geometry *)arg;
1121 /* just fake some geometry here, it's nonsense anyway; to make it
1122 * easy, use Adaptec's usual 64/32 mapping */
1123 put_user( 64, &geo->heads );
1124 put_user( 32, &geo->sectors );
1125 put_user( acsi_info[dev].size >> 11, &geo->cylinders );
1126 put_user( acsi_part[MINOR(inode->i_rdev)].start_sect, &geo->start );
1127 return 0;
1128 }
1129
1130 case SCSI_IOCTL_GET_IDLUN:
1131 /* SCSI compatible GET_IDLUN call to get target's ID and LUN number */
1132 put_user( acsi_info[dev].target | (acsi_info[dev].lun << 8),
1133 &((Scsi_Idlun *) arg)->dev_id );
1134 put_user( 0, &((Scsi_Idlun *) arg)->host_unique_id );
1135 return 0;
1136
1137 case BLKGETSIZE: /* Return device size */
1138 return put_user(acsi_part[MINOR(inode->i_rdev)].nr_sects,
1139 (long *) arg);
1140
1141 case BLKGETSIZE64: /* Return device size */
1142 return put_user((u64)acsi_part[MINOR(inode->i_rdev)].nr_sects << 9,
1143 (u64 *) arg);
1144
1145 case BLKROSET:
1146 case BLKROGET:
1147 case BLKFLSBUF:
1148 case BLKPG:
1149 return blk_ioctl(inode->i_rdev, cmd, arg);
1150
1151 case BLKRRPART: /* Re-read partition tables */
1152 if (!capable(CAP_SYS_ADMIN))
1153 return -EACCES;
1154 return revalidate_acsidisk(inode->i_rdev, 1);
1155
1156 default:
1157 return -EINVAL;
1158 }
1159 }
1160
1161
1162 /*
1163 * Open a device, check for read-only and lock the medium if it is
1164 * removable.
1165 *
1166 * Changes by Martin Rogge, 9th Aug 1995:
1167 * Check whether check_disk_change (and therefore revalidate_acsidisk)
1168 * was successful. They fail when there is no medium in the drive.
1169 *
1170 * The problem of media being changed during an operation can be
1171 * ignored because of the prevent_removal code.
1172 *
1173 * Added check for the validity of the device number.
1174 *
1175 */
1176
1177 static int acsi_open( struct inode * inode, struct file * filp )
1178 {
1179 int device;
1180 struct acsi_info_struct *aip;
1181
1182 device = DEVICE_NR(MINOR(inode->i_rdev));
1183 if (device >= NDevices)
1184 return -ENXIO;
1185 aip = &acsi_info[device];
1186 while (busy[device])
1187 sleep_on(&busy_wait);
1188
1189 if (access_count[device] == 0 && aip->removable) {
1190 #if 0
1191 aip->changed = 1; /* safety first */
1192 #endif
1193 check_disk_change( inode->i_rdev );
1194 if (aip->changed) /* revalidate was not successful (no medium) */
1195 return -ENXIO;
1196 acsi_prevent_removal(device, 1);
1197 }
1198 access_count[device]++;
1199 MOD_INC_USE_COUNT;
1200
1201 if (filp && filp->f_mode) {
1202 check_disk_change( inode->i_rdev );
1203 if (filp->f_mode & 2) {
1204 if (aip->read_only) {
1205 acsi_release( inode, filp );
1206 return -EROFS;
1207 }
1208 }
1209 }
1210
1211 return 0;
1212 }
1213
1214 /*
1215 * Releasing a block device means we sync() it, so that it can safely
1216 * be forgotten about...
1217 */
1218
1219 static int acsi_release( struct inode * inode, struct file * file )
1220 {
1221 int device = DEVICE_NR(MINOR(inode->i_rdev));
1222 if (--access_count[device] == 0 && acsi_info[device].removable)
1223 acsi_prevent_removal(device, 0);
1224 MOD_DEC_USE_COUNT;
1225 return( 0 );
1226 }
1227
1228 /*
1229 * Prevent or allow a media change for removable devices.
1230 */
1231
1232 static void acsi_prevent_removal(int device, int flag)
1233 {
1234 stdma_lock( NULL, NULL );
1235
1236 CMDSET_TARG_LUN(pa_med_rem_cmd, acsi_info[device].target,
1237 acsi_info[device].lun);
1238 CMDSET_LEN( pa_med_rem_cmd, flag );
1239
1240 if (acsicmd_nodma(pa_med_rem_cmd, 0) && acsi_wait_for_IRQ(3*HZ))
1241 acsi_getstatus();
1242 /* Do not report errors -- some devices may not know this command. */
1243
1244 ENABLE_IRQ();
1245 stdma_release();
1246 }
1247
1248 static int acsi_media_change (dev_t dev)
1249 {
1250 int device = DEVICE_NR(MINOR(dev));
1251 struct acsi_info_struct *aip;
1252
1253 aip = &acsi_info[device];
1254 if (!aip->removable)
1255 return 0;
1256
1257 if (aip->changed)
1258 /* We can be sure that the medium has been changed -- REQUEST
1259 * SENSE has reported this earlier.
1260 */
1261 return 1;
1262
1263 /* If the flag isn't set, make a test by reading block 0.
1264 * If errors happen, it seems to be better to say "changed"...
1265 */
1266 stdma_lock( NULL, NULL );
1267 CMDSET_TARG_LUN(read_cmd, aip->target, aip->lun);
1268 CMDSET_BLOCK( read_cmd, 0 );
1269 CMDSET_LEN( read_cmd, 1 );
1270 if (acsicmd_dma(read_cmd, acsi_buffer, 1, 0, 0) &&
1271 acsi_wait_for_IRQ(3*HZ)) {
1272 if (acsi_getstatus()) {
1273 if (acsi_reqsense(acsi_buffer, aip->target, aip->lun)) {
1274 if (CARTRCH_STAT(device, acsi_buffer))
1275 aip->changed = 1;
1276 }
1277 else {
1278 printk( KERN_ERR "ad%c: REQUEST SENSE failed in test for "
1279 "medium change; assuming a change\n", device + 'a' );
1280 aip->changed = 1;
1281 }
1282 }
1283 }
1284 else {
1285 printk( KERN_ERR "ad%c: Test for medium changed timed out; "
1286 "assuming a change\n", device + 'a');
1287 aip->changed = 1;
1288 }
1289 ENABLE_IRQ();
1290 stdma_release();
1291
1292 /* Now, after reading a block, the changed status is surely valid. */
1293 return aip->changed;
1294 }
1295
1296
1297 static int acsi_change_blk_size( int target, int lun)
1298
1299 { int i;
1300
1301 for (i=0; i<12; i++)
1302 acsi_buffer[i] = 0;
1303
1304 acsi_buffer[3] = 8;
1305 acsi_buffer[10] = 2;
1306 CMDSET_TARG_LUN( modeselect_cmd, target, lun);
1307
1308 if (!acsicmd_dma( modeselect_cmd, acsi_buffer, 1,1,0) ||
1309 !acsi_wait_for_IRQ( 3*HZ ) ||
1310 acsi_getstatus() != 0 ) {
1311 return(0);
1312 }
1313 return(1);
1314 }
1315
1316
1317 static int acsi_mode_sense( int target, int lun, SENSE_DATA *sd )
1318
1319 {
1320 int page;
1321
1322 CMDSET_TARG_LUN( modesense_cmd, target, lun );
1323 for (page=0; page<4; page++) {
1324 modesense_cmd[2] = page;
1325 if (!acsicmd_dma( modesense_cmd, acsi_buffer, 1, 0, 0 ) ||
1326 !acsi_wait_for_IRQ( 3*HZ ) ||
1327 acsi_getstatus())
1328 continue;
1329
1330 /* read twice to jump over the second 16-byte border! */
1331 udelay(300);
1332 if (acsi_wait_for_noIRQ( 20 ) &&
1333 acsicmd_nodma( modesense_cmd, 0 ) &&
1334 acsi_wait_for_IRQ( 3*HZ ) &&
1335 acsi_getstatus() == 0)
1336 break;
1337 }
1338 if (page == 4) {
1339 return(0);
1340 }
1341
1342 dma_cache_maintenance( phys_acsi_buffer, sizeof(SENSE_DATA), 0 );
1343 *sd = *(SENSE_DATA *)acsi_buffer;
1344
1345 /* Validity check, depending on type of data */
1346
1347 switch( SENSE_TYPE(*sd) ) {
1348
1349 case SENSE_TYPE_ATARI:
1350 if (CAPACITY(*sd) == 0)
1351 goto invalid_sense;
1352 break;
1353
1354 case SENSE_TYPE_SCSI:
1355 if (sd->scsi.descriptor_size != 8)
1356 goto invalid_sense;
1357 break;
1358
1359 case SENSE_TYPE_UNKNOWN:
1360
1361 printk( KERN_ERR "ACSI target %d, lun %d: Cannot interpret "
1362 "sense data\n", target, lun );
1363
1364 invalid_sense:
1365
1366 #ifdef DEBUG
1367 { int i;
1368 printk( "Mode sense data for ACSI target %d, lun %d seem not valid:",
1369 target, lun );
1370 for( i = 0; i < sizeof(SENSE_DATA); ++i )
1371 printk( "%02x ", (unsigned char)acsi_buffer[i] );
1372 printk( "\n" );
1373 }
1374 #endif
1375 return( 0 );
1376 }
1377
1378 return( 1 );
1379 }
1380
1381
1382
1383 /*******************************************************************
1384 *
1385 * Initialization
1386 *
1387 ********************************************************************/
1388
1389
1390 extern struct block_device_operations acsi_fops;
1391
1392 static struct gendisk acsi_gendisk = {
1393 major: MAJOR_NR,
1394 major_name: "ad",
1395 minor_shift: 4,
1396 max_p: 1 << 4,
1397 part: acsi_part,
1398 sizes: acsi_sizes,
1399 real_devices: (void *)acsi_info,
1400 fops: &acsi_fops,
1401 };
1402
1403 #define MAX_SCSI_DEVICE_CODE 10
1404
1405 static const char *const scsi_device_types[MAX_SCSI_DEVICE_CODE] =
1406 {
1407 "Direct-Access ",
1408 "Sequential-Access",
1409 "Printer ",
1410 "Processor ",
1411 "WORM ",
1412 "CD-ROM ",
1413 "Scanner ",
1414 "Optical Device ",
1415 "Medium Changer ",
1416 "Communications "
1417 };
1418
1419 static void print_inquiry(unsigned char *data)
1420 {
1421 int i;
1422
1423 printk(KERN_INFO " Vendor: ");
1424 for (i = 8; i < 16; i++)
1425 {
1426 if (data[i] >= 0x20 && i < data[4] + 5)
1427 printk("%c", data[i]);
1428 else
1429 printk(" ");
1430 }
1431
1432 printk(" Model: ");
1433 for (i = 16; i < 32; i++)
1434 {
1435 if (data[i] >= 0x20 && i < data[4] + 5)
1436 printk("%c", data[i]);
1437 else
1438 printk(" ");
1439 }
1440
1441 printk(" Rev: ");
1442 for (i = 32; i < 36; i++)
1443 {
1444 if (data[i] >= 0x20 && i < data[4] + 5)
1445 printk("%c", data[i]);
1446 else
1447 printk(" ");
1448 }
1449
1450 printk("\n");
1451
1452 i = data[0] & 0x1f;
1453
1454 printk(KERN_INFO " Type: %s ", (i < MAX_SCSI_DEVICE_CODE
1455 ? scsi_device_types[i]
1456 : "Unknown "));
1457 printk(" ANSI SCSI revision: %02x", data[2] & 0x07);
1458 if ((data[2] & 0x07) == 1 && (data[3] & 0x0f) == 1)
1459 printk(" CCS\n");
1460 else
1461 printk("\n");
1462 }
1463
1464
1465 /*
1466 * Changes by Martin Rogge, 9th Aug 1995:
1467 * acsi_devinit has been taken out of acsi_geninit, because it needs
1468 * to be called from revalidate_acsidisk. The result of request sense
1469 * is now checked for DRIVE NOT READY.
1470 *
1471 * The structure *aip is only valid when acsi_devinit returns
1472 * DEV_SUPPORTED.
1473 *
1474 */
1475
1476 #define DEV_NONE 0
1477 #define DEV_UNKNOWN 1
1478 #define DEV_SUPPORTED 2
1479 #define DEV_SLM 3
1480
1481 static int acsi_devinit(struct acsi_info_struct *aip)
1482 {
1483 int status, got_inquiry;
1484 SENSE_DATA sense;
1485 unsigned char reqsense, extsense;
1486
1487 /*****************************************************************/
1488 /* Do a TEST UNIT READY command to test the presence of a device */
1489 /*****************************************************************/
1490
1491 CMDSET_TARG_LUN(tur_cmd, aip->target, aip->lun);
1492 if (!acsicmd_nodma(tur_cmd, 0)) {
1493 /* timed out -> no device here */
1494 #ifdef DEBUG_DETECT
1495 printk("target %d lun %d: timeout\n", aip->target, aip->lun);
1496 #endif
1497 return DEV_NONE;
1498 }
1499
1500 /*************************/
1501 /* Read the ACSI status. */
1502 /*************************/
1503
1504 status = acsi_getstatus();
1505 if (status) {
1506 if (status == 0x12) {
1507 /* The SLM printer should be the only device that
1508 * responds with the error code in the status byte. In
1509 * correct status bytes, bit 4 is never set.
1510 */
1511 printk( KERN_INFO "Detected SLM printer at id %d lun %d\n",
1512 aip->target, aip->lun);
1513 return DEV_SLM;
1514 }
1515 /* ignore CHECK CONDITION, since some devices send a
1516 UNIT ATTENTION */
1517 if ((status & 0x1e) != 0x2) {
1518 #ifdef DEBUG_DETECT
1519 printk("target %d lun %d: status %d\n",
1520 aip->target, aip->lun, status);
1521 #endif
1522 return DEV_UNKNOWN;
1523 }
1524 }
1525
1526 /*******************************/
1527 /* Do a REQUEST SENSE command. */
1528 /*******************************/
1529
1530 if (!acsi_reqsense(acsi_buffer, aip->target, aip->lun)) {
1531 printk( KERN_WARNING "acsi_reqsense failed\n");
1532 acsi_buffer[0] = 0;
1533 acsi_buffer[2] = UNIT_ATTENTION;
1534 }
1535 reqsense = acsi_buffer[0];
1536 extsense = acsi_buffer[2] & 0xf;
1537 if (status) {
1538 if ((reqsense & 0x70) == 0x70) { /* extended sense */
1539 if (extsense != UNIT_ATTENTION &&
1540 extsense != NOT_READY) {
1541 #ifdef DEBUG_DETECT
1542 printk("target %d lun %d: extended sense %d\n",
1543 aip->target, aip->lun, extsense);
1544 #endif
1545 return DEV_UNKNOWN;
1546 }
1547 }
1548 else {
1549 if (reqsense & 0x7f) {
1550 #ifdef DEBUG_DETECT
1551 printk("target %d lun %d: sense %d\n",
1552 aip->target, aip->lun, reqsense);
1553 #endif
1554 return DEV_UNKNOWN;
1555 }
1556 }
1557 }
1558 else
1559 if (reqsense == 0x4) { /* SH204 Bug workaround */
1560 #ifdef DEBUG_DETECT
1561 printk("target %d lun %d status=0 sense=4\n",
1562 aip->target, aip->lun);
1563 #endif
1564 return DEV_UNKNOWN;
1565 }
1566
1567 /***********************************************************/
1568 /* Do an INQUIRY command to get more infos on this device. */
1569 /***********************************************************/
1570
1571 /* Assume default values */
1572 aip->removable = 1;
1573 aip->read_only = 0;
1574 aip->old_atari_disk = 0;
1575 aip->changed = (extsense == NOT_READY); /* medium inserted? */
1576 aip->size = DEFAULT_SIZE;
1577 got_inquiry = 0;
1578 /* Fake inquiry result for old atari disks */
1579 memcpy(acsi_buffer, "\000\000\001\000 Adaptec 40xx"
1580 " ", 40);
1581 CMDSET_TARG_LUN(inquiry_cmd, aip->target, aip->lun);
1582 if (acsicmd_dma(inquiry_cmd, acsi_buffer, 1, 0, 0) &&
1583 acsi_getstatus() == 0) {
1584 acsicmd_nodma(inquiry_cmd, 0);
1585 acsi_getstatus();
1586 dma_cache_maintenance( phys_acsi_buffer, 256, 0 );
1587 got_inquiry = 1;
1588 aip->removable = !!(acsi_buffer[1] & 0x80);
1589 }
1590 if (aip->type == NONE) /* only at boot time */
1591 print_inquiry(acsi_buffer);
1592 switch(acsi_buffer[0]) {
1593 case TYPE_DISK:
1594 aip->type = HARDDISK;
1595 break;
1596 case TYPE_ROM:
1597 aip->type = CDROM;
1598 aip->read_only = 1;
1599 break;
1600 default:
1601 return DEV_UNKNOWN;
1602 }
1603 /****************************/
1604 /* Do a MODE SENSE command. */
1605 /****************************/
1606
1607 if (!acsi_mode_sense(aip->target, aip->lun, &sense)) {
1608 printk( KERN_WARNING "No mode sense data.\n" );
1609 return DEV_UNKNOWN;
1610 }
1611 if ((SECTOR_SIZE(sense) != 512) &&
1612 ((aip->type != CDROM) ||
1613 !acsi_change_blk_size(aip->target, aip->lun) ||
1614 !acsi_mode_sense(aip->target, aip->lun, &sense) ||
1615 (SECTOR_SIZE(sense) != 512))) {
1616 printk( KERN_WARNING "Sector size != 512 not supported.\n" );
1617 return DEV_UNKNOWN;
1618 }
1619 /* There are disks out there that claim to have 0 sectors... */
1620 if (CAPACITY(sense))
1621 aip->size = CAPACITY(sense); /* else keep DEFAULT_SIZE */
1622 if (!got_inquiry && SENSE_TYPE(sense) == SENSE_TYPE_ATARI) {
1623 /* If INQUIRY failed and the sense data suggest an old
1624 * Atari disk (SH20x, Megafile), the disk is not removable
1625 */
1626 aip->removable = 0;
1627 aip->old_atari_disk = 1;
1628 }
1629
1630 /******************/
1631 /* We've done it. */
1632 /******************/
1633
1634 return DEV_SUPPORTED;
1635 }
1636
1637 EXPORT_SYMBOL(acsi_delay_start);
1638 EXPORT_SYMBOL(acsi_delay_end);
1639 EXPORT_SYMBOL(acsi_wait_for_IRQ);
1640 EXPORT_SYMBOL(acsi_wait_for_noIRQ);
1641 EXPORT_SYMBOL(acsicmd_nodma);
1642 EXPORT_SYMBOL(acsi_getstatus);
1643 EXPORT_SYMBOL(acsi_buffer);
1644 EXPORT_SYMBOL(phys_acsi_buffer);
1645
1646 #ifdef CONFIG_ATARI_SLM_MODULE
1647 void acsi_attach_SLMs( int (*attach_func)( int, int ) );
1648
1649 EXPORT_SYMBOL(acsi_extstatus);
1650 EXPORT_SYMBOL(acsi_end_extstatus);
1651 EXPORT_SYMBOL(acsi_extcmd);
1652 EXPORT_SYMBOL(acsi_attach_SLMs);
1653
1654 /* to remember IDs of SLM devices, SLM module is loaded later
1655 * (index is target#, contents is lun#, -1 means "no SLM") */
1656 int SLM_devices[8];
1657 #endif
1658
1659 static struct block_device_operations acsi_fops = {
1660 open: acsi_open,
1661 release: acsi_release,
1662 ioctl: acsi_ioctl,
1663 check_media_change: acsi_media_change,
1664 revalidate: acsi_revalidate,
1665 };
1666
1667 static void acsi_geninit(void)
1668 {
1669 int i, target, lun;
1670 struct acsi_info_struct *aip;
1671 #ifdef CONFIG_ATARI_SLM
1672 int n_slm = 0;
1673 #endif
1674
1675 printk( KERN_INFO "Probing ACSI devices:\n" );
1676 NDevices = 0;
1677 #ifdef CONFIG_ATARI_SLM_MODULE
1678 for( i = 0; i < 8; ++i )
1679 SLM_devices[i] = -1;
1680 #endif
1681 stdma_lock(NULL, NULL);
1682
1683 for (target = 0; target < 8 && NDevices < MAX_DEV; ++target) {
1684 lun = 0;
1685 do {
1686 aip = &acsi_info[NDevices];
1687 aip->type = NONE;
1688 aip->target = target;
1689 aip->lun = lun;
1690 i = acsi_devinit(aip);
1691 switch (i) {
1692 case DEV_SUPPORTED:
1693 printk( KERN_INFO "Detected ");
1694 switch (aip->type) {
1695 case HARDDISK:
1696 printk("disk");
1697 break;
1698 case CDROM:
1699 printk("cdrom");
1700 break;
1701 default:
1702 }
1703 printk(" ad%c at id %d lun %d ",
1704 'a' + NDevices, target, lun);
1705 if (aip->removable)
1706 printk("(removable) ");
1707 if (aip->read_only)
1708 printk("(read-only) ");
1709 if (aip->size == DEFAULT_SIZE)
1710 printk(" unkown size, using default ");
1711 printk("%ld MByte\n",
1712 (aip->size*512+1024*1024/2)/(1024*1024));
1713 NDevices++;
1714 break;
1715 case DEV_SLM:
1716 #ifdef CONFIG_ATARI_SLM
1717 n_slm += attach_slm( target, lun );
1718 break;
1719 #endif
1720 #ifdef CONFIG_ATARI_SLM_MODULE
1721 SLM_devices[target] = lun;
1722 break;
1723 #endif
1724 /* neither of the above: fall through to unknown device */
1725 case DEV_UNKNOWN:
1726 printk( KERN_INFO "Detected unsupported device at "
1727 "id %d lun %d\n", target, lun);
1728 break;
1729 }
1730 }
1731 #ifdef CONFIG_ACSI_MULTI_LUN
1732 while (i != DEV_NONE && ++lun < MAX_LUN);
1733 #else
1734 while (0);
1735 #endif
1736 }
1737
1738 /* reenable interrupt */
1739 ENABLE_IRQ();
1740 stdma_release();
1741
1742 #ifndef CONFIG_ATARI_SLM
1743 printk( KERN_INFO "Found %d ACSI device(s) total.\n", NDevices );
1744 #else
1745 printk( KERN_INFO "Found %d ACSI device(s) and %d SLM printer(s) total.\n",
1746 NDevices, n_slm );
1747 #endif
1748
1749 for( i = 0; i < (MAX_DEV << 4); i++ )
1750 acsi_blocksizes[i] = 1024;
1751 blksize_size[MAJOR_NR] = acsi_blocksizes;
1752 for( i = 0; i < NDevices; ++i )
1753 register_disk(&acsi_gendisk, MKDEV(MAJOR_NR,i<<4),
1754 (acsi_info[i].type==HARDDISK)?1<<4:1,
1755 &acsi_fops,
1756 acsi_info[i].size);
1757 acsi_gendisk.nr_real = NDevices;
1758 }
1759
1760 #ifdef CONFIG_ATARI_SLM_MODULE
1761 /* call attach_slm() for each device that is a printer; needed for init of SLM
1762 * driver as a module, since it's not yet present if acsi.c is inited and thus
1763 * the bus gets scanned. */
1764 void acsi_attach_SLMs( int (*attach_func)( int, int ) )
1765 {
1766 int i, n = 0;
1767
1768 for( i = 0; i < 8; ++i )
1769 if (SLM_devices[i] >= 0)
1770 n += (*attach_func)( i, SLM_devices[i] );
1771 printk( KERN_INFO "Found %d SLM printer(s) total.\n", n );
1772 }
1773 #endif /* CONFIG_ATARI_SLM_MODULE */
1774
1775
1776 int acsi_init( void )
1777
1778 {
1779 int err = 0;
1780 if (!MACH_IS_ATARI || !ATARIHW_PRESENT(ACSI))
1781 return 0;
1782 if (devfs_register_blkdev( MAJOR_NR, "ad", &acsi_fops )) {
1783 printk( KERN_ERR "Unable to get major %d for ACSI\n", MAJOR_NR );
1784 return -EBUSY;
1785 }
1786 if (!(acsi_buffer =
1787 (char *)atari_stram_alloc(ACSI_BUFFER_SIZE, "acsi"))) {
1788 printk( KERN_ERR "Unable to get ACSI ST-Ram buffer.\n" );
1789 devfs_unregister_blkdev( MAJOR_NR, "ad" );
1790 return -ENOMEM;
1791 }
1792 phys_acsi_buffer = virt_to_phys( acsi_buffer );
1793 STramMask = ATARIHW_PRESENT(EXTD_DMA) ? 0x00000000 : 0xff000000;
1794
1795 blk_init_queue(BLK_DEFAULT_QUEUE(MAJOR_NR), DEVICE_REQUEST);
1796 read_ahead[MAJOR_NR] = 8; /* 8 sector (4kB) read-ahead */
1797 add_gendisk(&acsi_gendisk);
1798
1799 #ifdef CONFIG_ATARI_SLM
1800 err = slm_init();
1801 #endif
1802 if (!err)
1803 acsi_geninit();
1804 return err;
1805 }
1806
1807
1808 #ifdef MODULE
1809
1810 MODULE_LICENSE("GPL");
1811
1812 int init_module(void)
1813 {
1814 int err;
1815
1816 if ((err = acsi_init()))
1817 return( err );
1818 printk( KERN_INFO "ACSI driver loaded as module.\n");
1819 return( 0 );
1820 }
1821
1822 void cleanup_module(void)
1823 {
1824 del_timer( &acsi_timer );
1825 blk_cleanup_queue(BLK_DEFAULT_QUEUE(MAJOR_NR));
1826 atari_stram_free( acsi_buffer );
1827
1828 if (devfs_unregister_blkdev( MAJOR_NR, "ad" ) != 0)
1829 printk( KERN_ERR "acsi: cleanup_module failed\n");
1830
1831 del_gendisk(&acsi_gendisk);
1832 }
1833 #endif
1834
1835 #define DEVICE_BUSY busy[device]
1836 #define USAGE access_count[device]
1837 #define GENDISK_STRUCT acsi_gendisk
1838
1839 /*
1840 * This routine is called to flush all partitions and partition tables
1841 * for a changed scsi disk, and then re-read the new partition table.
1842 * If we are revalidating a disk because of a media change, then we
1843 * enter with usage == 0. If we are using an ioctl, we automatically have
1844 * usage == 1 (we need an open channel to use an ioctl :-), so this
1845 * is our limit.
1846 *
1847 * Changes by Martin Rogge, 9th Aug 1995:
1848 * got cd-roms to work by calling acsi_devinit. There are only two problems:
1849 * First, if there is no medium inserted, the status will remain "changed".
1850 * That is no problem at all, but our design of three-valued logic (medium
1851 * changed, medium not changed, no medium inserted).
1852 * Secondly the check could fail completely and the drive could deliver
1853 * nonsensical data, which could mess up the acsi_info[] structure. In
1854 * that case we try to make the entry safe.
1855 *
1856 */
1857
1858 static int revalidate_acsidisk( int dev, int maxusage )
1859 {
1860 int device;
1861 struct gendisk * gdev;
1862 int max_p, start, i;
1863 struct acsi_info_struct *aip;
1864
1865 device = DEVICE_NR(MINOR(dev));
1866 aip = &acsi_info[device];
1867 gdev = &GENDISK_STRUCT;
1868
1869 cli();
1870 if (DEVICE_BUSY || USAGE > maxusage) {
1871 sti();
1872 return -EBUSY;
1873 };
1874 DEVICE_BUSY = 1;
1875 sti();
1876
1877 max_p = gdev->max_p;
1878 start = device << gdev->minor_shift;
1879
1880 for( i = max_p - 1; i >= 0 ; i-- ) {
1881 if (gdev->part[start + i].nr_sects != 0) {
1882 invalidate_device(MKDEV(MAJOR_NR, start + i), 1);
1883 gdev->part[start + i].nr_sects = 0;
1884 }
1885 gdev->part[start+i].start_sect = 0;
1886 };
1887
1888 stdma_lock( NULL, NULL );
1889
1890 if (acsi_devinit(aip) != DEV_SUPPORTED) {
1891 printk( KERN_ERR "ACSI: revalidate failed for target %d lun %d\n",
1892 aip->target, aip->lun);
1893 aip->size = 0;
1894 aip->read_only = 1;
1895 aip->removable = 1;
1896 aip->changed = 1; /* next acsi_open will try again... */
1897 }
1898
1899 ENABLE_IRQ();
1900 stdma_release();
1901
1902 grok_partitions(gdev, device, (aip->type==HARDDISK)?1<<4:1, aip->size);
1903
1904 DEVICE_BUSY = 0;
1905 wake_up(&busy_wait);
1906 return 0;
1907 }
1908
1909
1910 static int acsi_revalidate (dev_t dev)
1911 {
1912 return revalidate_acsidisk (dev, 0);
1913 }
1914