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Ok. I didn't make 2.4.0 in 2000. Tough. I tried, but we had some
[davej-history.git] / drivers / block / acsi.c
blobfd3101f7f8022e00ee14a76770fa881b2929bb73
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/malloc.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 #define min(a,b) (((a)<(b))?(a):(b))
296
297
298 /* ACSI errors (from REQUEST SENSE); There are two tables, one for the
299 * old Atari disks and one for SCSI on ACSI disks.
300 */
301
302 struct acsi_error {
303 unsigned char code;
304 const char *text;
305 } atari_acsi_errors[] = {
306 { 0x00, "No error (??)" },
307 { 0x01, "No index pulses" },
308 { 0x02, "Seek not complete" },
309 { 0x03, "Write fault" },
310 { 0x04, "Drive not ready" },
311 { 0x06, "No Track 00 signal" },
312 { 0x10, "ECC error in ID field" },
313 { 0x11, "Uncorrectable data error" },
314 { 0x12, "ID field address mark not found" },
315 { 0x13, "Data field address mark not found" },
316 { 0x14, "Record not found" },
317 { 0x15, "Seek error" },
318 { 0x18, "Data check in no retry mode" },
319 { 0x19, "ECC error during verify" },
320 { 0x1a, "Access to bad block" },
321 { 0x1c, "Unformatted or bad format" },
322 { 0x20, "Invalid command" },
323 { 0x21, "Invalid block address" },
324 { 0x23, "Volume overflow" },
325 { 0x24, "Invalid argument" },
326 { 0x25, "Invalid drive number" },
327 { 0x26, "Byte zero parity check" },
328 { 0x28, "Cartride changed" },
329 { 0x2c, "Error count overflow" },
330 { 0x30, "Controller selftest failed" }
331 },
332
333 scsi_acsi_errors[] = {
334 { 0x00, "No error (??)" },
335 { 0x01, "Recovered error" },
336 { 0x02, "Drive not ready" },
337 { 0x03, "Uncorrectable medium error" },
338 { 0x04, "Hardware error" },
339 { 0x05, "Illegal request" },
340 { 0x06, "Unit attention (Reset or cartridge changed)" },
341 { 0x07, "Data protection" },
342 { 0x08, "Blank check" },
343 { 0x0b, "Aborted Command" },
344 { 0x0d, "Volume overflow" }
345 };
346
347
348
349 /***************************** Prototypes *****************************/
350
351 static int acsicmd_dma( const char *cmd, char *buffer, int blocks, int
352 rwflag, int enable);
353 static int acsi_reqsense( char *buffer, int targ, int lun);
354 static void acsi_print_error( const unsigned char *errblk, int dev );
355 static void acsi_interrupt (int irq, void *data, struct pt_regs *fp);
356 static void unexpected_acsi_interrupt( void );
357 static void bad_rw_intr( void );
358 static void read_intr( void );
359 static void write_intr( void);
360 static void acsi_times_out( unsigned long dummy );
361 static void copy_to_acsibuffer( void );
362 static void copy_from_acsibuffer( void );
363 static void do_end_requests( void );
364 static void do_acsi_request( request_queue_t * );
365 static void redo_acsi_request( void );
366 static int acsi_ioctl( struct inode *inode, struct file *file, unsigned int
367 cmd, unsigned long arg );
368 static int acsi_open( struct inode * inode, struct file * filp );
369 static int acsi_release( struct inode * inode, struct file * file );
370 static void acsi_prevent_removal( int target, int flag );
371 static int acsi_change_blk_size( int target, int lun);
372 static int acsi_mode_sense( int target, int lun, SENSE_DATA *sd );
373 static void acsi_geninit(void);
374 static int revalidate_acsidisk( int dev, int maxusage );
375 static int acsi_revalidate (dev_t);
376
377 /************************* End of Prototypes **************************/
378
379
380 struct timer_list acsi_timer = { NULL, NULL, 0, 0, acsi_times_out };
381
382
383 #ifdef CONFIG_ATARI_SLM
384
385 extern int attach_slm( int target, int lun );
386 extern int slm_init( void );
387
388 #endif
389
390
391 \f
392 /***********************************************************************
393 *
394 * ACSI primitives
395 *
396 **********************************************************************/
397
398
399 /*
400 * The following two functions wait for _IRQ to become Low or High,
401 * resp., with a timeout. The 'timeout' parameter is in jiffies
402 * (10ms).
403 * If the functions are called with timer interrupts on (int level <
404 * 6), the timeout is based on the 'jiffies' variable to provide exact
405 * timeouts for device probing etc.
406 * If interrupts are disabled, the number of tries is based on the
407 * 'loops_per_jiffy' variable. A rough estimation is sufficient here...
408 */
409
410 #define INT_LEVEL \
411 ({ unsigned __sr; \
412 __asm__ __volatile__ ( "movew %/sr,%0" : "=dm" (__sr) ); \
413 (__sr >> 8) & 7; \
414 })
415
416 int acsi_wait_for_IRQ( unsigned timeout )
417
418 {
419 if (INT_LEVEL < 6) {
420 unsigned long maxjif = jiffies + timeout;
421 while (time_before(jiffies, maxjif))
422 if (!(mfp.par_dt_reg & 0x20)) return( 1 );
423 }
424 else {
425 long tries = loops_per_jiffy / 8 * timeout;
426 while( --tries >= 0 )
427 if (!(mfp.par_dt_reg & 0x20)) return( 1 );
428 }
429 return( 0 ); /* timeout! */
430 }
431
432
433 int acsi_wait_for_noIRQ( unsigned timeout )
434
435 {
436 if (INT_LEVEL < 6) {
437 unsigned long maxjif = jiffies + timeout;
438 while (time_before(jiffies, maxjif))
439 if (mfp.par_dt_reg & 0x20) return( 1 );
440 }
441 else {
442 long tries = loops_per_jiffy * timeout / 8;
443 while( tries-- >= 0 )
444 if (mfp.par_dt_reg & 0x20) return( 1 );
445 }
446 return( 0 ); /* timeout! */
447 }
448
449 static struct timeval start_time;
450
451 void
452 acsi_delay_start(void)
453 {
454 do_gettimeofday(&start_time);
455 }
456
457 /* wait from acsi_delay_start to now usec (<1E6) usec */
458
459 void
460 acsi_delay_end(long usec)
461 {
462 struct timeval end_time;
463 long deltau,deltas;
464 do_gettimeofday(&end_time);
465 deltau=end_time.tv_usec - start_time.tv_usec;
466 deltas=end_time.tv_sec - start_time.tv_sec;
467 if (deltas > 1 || deltas < 0)
468 return;
469 if (deltas > 0)
470 deltau += 1000*1000;
471 if (deltau >= usec)
472 return;
473 udelay(usec-deltau);
474 }
475
476 /* acsicmd_dma() sends an ACSI command and sets up the DMA to transfer
477 * 'blocks' blocks of 512 bytes from/to 'buffer'.
478 * Because the _IRQ signal is used for handshaking the command bytes,
479 * the ACSI interrupt has to be disabled in this function. If the end
480 * of the operation should be signalled by a real interrupt, it has to be
481 * reenabled afterwards.
482 */
483
484 static int acsicmd_dma( const char *cmd, char *buffer, int blocks, int rwflag, int enable)
485
486 { unsigned long flags, paddr;
487 int i;
488
489 #ifdef NO_WRITE
490 if (rwflag || *cmd == 0x0a) {
491 printk( "ACSI: Write commands disabled!\n" );
492 return( 0 );
493 }
494 #endif
495
496 rwflag = rwflag ? 0x100 : 0;
497 paddr = virt_to_phys( buffer );
498
499 acsi_delay_end(COMMAND_DELAY);
500 DISABLE_IRQ();
501
502 save_flags(flags);
503 cli();
504 /* Low on A1 */
505 dma_wd.dma_mode_status = 0x88 | rwflag;
506 MFPDELAY();
507
508 /* set DMA address */
509 dma_wd.dma_lo = (unsigned char)paddr;
510 paddr >>= 8;
511 MFPDELAY();
512 dma_wd.dma_md = (unsigned char)paddr;
513 paddr >>= 8;
514 MFPDELAY();
515 if (ATARIHW_PRESENT(EXTD_DMA))
516 st_dma_ext_dmahi = (unsigned short)paddr;
517 else
518 dma_wd.dma_hi = (unsigned char)paddr;
519 MFPDELAY();
520 restore_flags(flags);
521
522 /* send the command bytes except the last */
523 for( i = 0; i < 5; ++i ) {
524 DMA_LONG_WRITE( *cmd++, 0x8a | rwflag );
525 udelay(20);
526 if (!acsi_wait_for_IRQ( HZ/2 )) return( 0 ); /* timeout */
527 }
528
529 /* Clear FIFO and switch DMA to correct direction */
530 dma_wd.dma_mode_status = 0x92 | (rwflag ^ 0x100);
531 MFPDELAY();
532 dma_wd.dma_mode_status = 0x92 | rwflag;
533 MFPDELAY();
534
535 /* How many sectors for DMA */
536 dma_wd.fdc_acces_seccount = blocks;
537 MFPDELAY();
538
539 /* send last command byte */
540 dma_wd.dma_mode_status = 0x8a | rwflag;
541 MFPDELAY();
542 DMA_LONG_WRITE( *cmd++, 0x0a | rwflag );
543 if (enable)
544 ENABLE_IRQ();
545 udelay(80);
546
547 return( 1 );
548 }
549
550
551 /*
552 * acsicmd_nodma() sends an ACSI command that requires no DMA.
553 */
554
555 int acsicmd_nodma( const char *cmd, int enable)
556
557 { int i;
558
559 acsi_delay_end(COMMAND_DELAY);
560 DISABLE_IRQ();
561
562 /* send first command byte */
563 dma_wd.dma_mode_status = 0x88;
564 MFPDELAY();
565 DMA_LONG_WRITE( *cmd++, 0x8a );
566 udelay(20);
567 if (!acsi_wait_for_IRQ( HZ/2 )) return( 0 ); /* timeout */
568
569 /* send the intermediate command bytes */
570 for( i = 0; i < 4; ++i ) {
571 DMA_LONG_WRITE( *cmd++, 0x8a );
572 udelay(20);
573 if (!acsi_wait_for_IRQ( HZ/2 )) return( 0 ); /* timeout */
574 }
575
576 /* send last command byte */
577 DMA_LONG_WRITE( *cmd++, 0x0a );
578 if (enable)
579 ENABLE_IRQ();
580 udelay(80);
581
582 return( 1 );
583 /* Note that the ACSI interrupt is still disabled after this
584 * function. If you want to get the IRQ delivered, enable it manually!
585 */
586 }
587
588
589 static int acsi_reqsense( char *buffer, int targ, int lun)
590
591 {
592 CMDSET_TARG_LUN( reqsense_cmd, targ, lun);
593 if (!acsicmd_dma( reqsense_cmd, buffer, 1, 0, 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 if (!acsicmd_nodma( reqsense_cmd, 0 )) return( 0 );
603 if (!acsi_wait_for_IRQ( 10 )) return( 0 );
604 acsi_getstatus();
605 dma_cache_maintenance( virt_to_phys(buffer), 16, 0 );
606
607 return( 1 );
608 }
609
610
611 /*
612 * ACSI status phase: get the status byte from the bus
613 *
614 * I've seen several times that a 0xff status is read, propably due to
615 * a timing error. In this case, the procedure is repeated after the
616 * next _IRQ edge.
617 */
618
619 int acsi_getstatus( void )
620
621 { int status;
622
623 DISABLE_IRQ();
624 for(;;) {
625 if (!acsi_wait_for_IRQ( 100 )) {
626 acsi_delay_start();
627 return( -1 );
628 }
629 dma_wd.dma_mode_status = 0x8a;
630 MFPDELAY();
631 status = dma_wd.fdc_acces_seccount;
632 if (status != 0xff) break;
633 #ifdef DEBUG
634 printk("ACSI: skipping 0xff status byte\n" );
635 #endif
636 udelay(40);
637 acsi_wait_for_noIRQ( 20 );
638 }
639 dma_wd.dma_mode_status = 0x80;
640 udelay(40);
641 acsi_wait_for_noIRQ( 20 );
642
643 acsi_delay_start();
644 return( status & 0x1f ); /* mask of the device# */
645 }
646
647
648 #if (defined(CONFIG_ATARI_SLM) || defined(CONFIG_ATARI_SLM_MODULE))
649
650 /* Receive data in an extended status phase. Needed by SLM printer. */
651
652 int acsi_extstatus( char *buffer, int cnt )
653
654 { int status;
655
656 DISABLE_IRQ();
657 udelay(80);
658 while( cnt-- > 0 ) {
659 if (!acsi_wait_for_IRQ( 40 )) return( 0 );
660 dma_wd.dma_mode_status = 0x8a;
661 MFPDELAY();
662 status = dma_wd.fdc_acces_seccount;
663 MFPDELAY();
664 *buffer++ = status & 0xff;
665 udelay(40);
666 }
667 return( 1 );
668 }
669
670
671 /* Finish an extended status phase */
672
673 void acsi_end_extstatus( void )
674
675 {
676 dma_wd.dma_mode_status = 0x80;
677 udelay(40);
678 acsi_wait_for_noIRQ( 20 );
679 acsi_delay_start();
680 }
681
682
683 /* Send data in an extended command phase */
684
685 int acsi_extcmd( unsigned char *buffer, int cnt )
686
687 {
688 while( cnt-- > 0 ) {
689 DMA_LONG_WRITE( *buffer++, 0x8a );
690 udelay(20);
691 if (!acsi_wait_for_IRQ( HZ/2 )) return( 0 ); /* timeout */
692 }
693 return( 1 );
694 }
695
696 #endif
697
698
699 static void acsi_print_error( const unsigned char *errblk, int dev )
700
701 { int atari_err, i, errcode;
702 struct acsi_error *arr;
703
704 atari_err = acsi_info[dev].old_atari_disk;
705 if (atari_err)
706 errcode = errblk[0] & 0x7f;
707 else
708 if ((errblk[0] & 0x70) == 0x70)
709 errcode = errblk[2] & 0x0f;
710 else
711 errcode = errblk[0] & 0x0f;
712
713 printk( KERN_ERR "ACSI error 0x%02x", errcode );
714
715 if (errblk[0] & 0x80)
716 printk( " for sector %d",
717 ((errblk[1] & 0x1f) << 16) |
718 (errblk[2] << 8) | errblk[0] );
719
720 arr = atari_err ? atari_acsi_errors : scsi_acsi_errors;
721 i = atari_err ? sizeof(atari_acsi_errors)/sizeof(*atari_acsi_errors) :
722 sizeof(scsi_acsi_errors)/sizeof(*scsi_acsi_errors);
723
724 for( --i; i >= 0; --i )
725 if (arr[i].code == errcode) break;
726 if (i >= 0)
727 printk( ": %s\n", arr[i].text );
728 }
729
730 /*******************************************************************
731 *
732 * ACSI interrupt routine
733 * Test, if this is a ACSI interrupt and call the irq handler
734 * Otherwise ignore this interrupt.
735 *
736 *******************************************************************/
737
738 static void acsi_interrupt(int irq, void *data, struct pt_regs *fp )
739
740 { void (*acsi_irq_handler)(void) = DEVICE_INTR;
741
742 DEVICE_INTR = NULL;
743 CLEAR_TIMER();
744
745 if (!acsi_irq_handler)
746 acsi_irq_handler = unexpected_acsi_interrupt;
747 acsi_irq_handler();
748 }
749
750
751 /******************************************************************
752 *
753 * The Interrupt handlers
754 *
755 *******************************************************************/
756
757
758 static void unexpected_acsi_interrupt( void )
759
760 {
761 printk( KERN_WARNING "Unexpected ACSI interrupt\n" );
762 }
763
764
765 /* This function is called in case of errors. Because we cannot reset
766 * the ACSI bus or a single device, there is no other choice than
767 * retrying several times :-(
768 */
769
770 static void bad_rw_intr( void )
771
772 {
773 if (QUEUE_EMPTY)
774 return;
775
776 if (++CURRENT->errors >= MAX_ERRORS)
777 end_request(0);
778 /* Otherwise just retry */
779 }
780
781
782 static void read_intr( void )
783
784 { int status;
785
786 status = acsi_getstatus();
787 if (status != 0) {
788 int dev = DEVICE_NR(MINOR(CURRENT->rq_dev));
789 printk( KERN_ERR "ad%c: ", dev+'a' );
790 if (!acsi_reqsense( acsi_buffer, acsi_info[dev].target,
791 acsi_info[dev].lun))
792 printk( "ACSI error and REQUEST SENSE failed (status=0x%02x)\n", status );
793 else {
794 acsi_print_error( acsi_buffer, dev );
795 if (CARTRCH_STAT( dev, acsi_buffer ))
796 acsi_info[dev].changed = 1;
797 }
798 ENABLE_IRQ();
799 bad_rw_intr();
800 redo_acsi_request();
801 return;
802 }
803
804 dma_cache_maintenance( virt_to_phys(CurrentBuffer), CurrentNSect*512, 0 );
805 if (CurrentBuffer == acsi_buffer)
806 copy_from_acsibuffer();
807
808 do_end_requests();
809 redo_acsi_request();
810 }
811
812
813 static void write_intr(void)
814
815 { int status;
816
817 status = acsi_getstatus();
818 if (status != 0) {
819 int dev = DEVICE_NR(MINOR(CURRENT->rq_dev));
820 printk( KERN_ERR "ad%c: ", dev+'a' );
821 if (!acsi_reqsense( acsi_buffer, acsi_info[dev].target,
822 acsi_info[dev].lun))
823 printk( "ACSI error and REQUEST SENSE failed (status=0x%02x)\n", status );
824 else {
825 acsi_print_error( acsi_buffer, dev );
826 if (CARTRCH_STAT( dev, acsi_buffer ))
827 acsi_info[dev].changed = 1;
828 }
829 bad_rw_intr();
830 redo_acsi_request();
831 return;
832 }
833
834 do_end_requests();
835 redo_acsi_request();
836 }
837
838
839 static void acsi_times_out( unsigned long dummy )
840
841 {
842 DISABLE_IRQ();
843 if (!DEVICE_INTR) return;
844
845 DEVICE_INTR = NULL;
846 printk( KERN_ERR "ACSI timeout\n" );
847 if (QUEUE_EMPTY) return;
848 if (++CURRENT->errors >= MAX_ERRORS) {
849 #ifdef DEBUG
850 printk( KERN_ERR "ACSI: too many errors.\n" );
851 #endif
852 end_request(0);
853 }
854
855 redo_acsi_request();
856 }
857
858
859 \f
860 /***********************************************************************
861 *
862 * Scatter-gather utility functions
863 *
864 ***********************************************************************/
865
866
867 static void copy_to_acsibuffer( void )
868
869 { int i;
870 char *src, *dst;
871 struct buffer_head *bh;
872
873 src = CURRENT->buffer;
874 dst = acsi_buffer;
875 bh = CURRENT->bh;
876
877 if (!bh)
878 memcpy( dst, src, CurrentNSect*512 );
879 else
880 for( i = 0; i < CurrentNReq; ++i ) {
881 memcpy( dst, src, bh->b_size );
882 dst += bh->b_size;
883 if ((bh = bh->b_reqnext))
884 src = bh->b_data;
885 }
886 }
887
888
889 static void copy_from_acsibuffer( void )
890
891 { int i;
892 char *src, *dst;
893 struct buffer_head *bh;
894
895 dst = CURRENT->buffer;
896 src = acsi_buffer;
897 bh = CURRENT->bh;
898
899 if (!bh)
900 memcpy( dst, src, CurrentNSect*512 );
901 else
902 for( i = 0; i < CurrentNReq; ++i ) {
903 memcpy( dst, src, bh->b_size );
904 src += bh->b_size;
905 if ((bh = bh->b_reqnext))
906 dst = bh->b_data;
907 }
908 }
909
910
911 static void do_end_requests( void )
912
913 { int i, n;
914
915 if (!CURRENT->bh) {
916 CURRENT->nr_sectors -= CurrentNSect;
917 CURRENT->current_nr_sectors -= CurrentNSect;
918 CURRENT->sector += CurrentNSect;
919 if (CURRENT->nr_sectors == 0)
920 end_request(1);
921 }
922 else {
923 for( i = 0; i < CurrentNReq; ++i ) {
924 n = CURRENT->bh->b_size >> 9;
925 CURRENT->nr_sectors -= n;
926 CURRENT->current_nr_sectors -= n;
927 CURRENT->sector += n;
928 end_request(1);
929 }
930 }
931 }
932
933
934
935 \f
936 /***********************************************************************
937 *
938 * do_acsi_request and friends
939 *
940 ***********************************************************************/
941
942 static void do_acsi_request( request_queue_t * q )
943
944 {
945 stdma_lock( acsi_interrupt, NULL );
946 redo_acsi_request();
947 }
948
949
950 static void redo_acsi_request( void )
951
952 { unsigned block, dev, target, lun, nsect;
953 char *buffer;
954 unsigned long pbuffer;
955 struct buffer_head *bh;
956
957 if (!QUEUE_EMPTY && CURRENT->rq_status == RQ_INACTIVE) {
958 if (!DEVICE_INTR) {
959 ENABLE_IRQ();
960 stdma_release();
961 }
962 return;
963 }
964
965 if (DEVICE_INTR)
966 return;
967
968 repeat:
969 CLEAR_TIMER();
970 /* Another check here: An interrupt or timer event could have
971 * happened since the last check!
972 */
973 if (!QUEUE_EMPTY && CURRENT->rq_status == RQ_INACTIVE) {
974 if (!DEVICE_INTR) {
975 ENABLE_IRQ();
976 stdma_release();
977 }
978 return;
979 }
980 if (DEVICE_INTR)
981 return;
982
983 if (QUEUE_EMPTY) {
984 CLEAR_INTR;
985 ENABLE_IRQ();
986 stdma_release();
987 return;
988 }
989
990 if (MAJOR(CURRENT->rq_dev) != MAJOR_NR)
991 panic(DEVICE_NAME ": request list destroyed");
992 if (CURRENT->bh) {
993 if (!CURRENT->bh && !buffer_locked(CURRENT->bh))
994 panic(DEVICE_NAME ": block not locked");
995 }
996
997 dev = MINOR(CURRENT->rq_dev);
998 block = CURRENT->sector;
999 if (DEVICE_NR(dev) >= NDevices ||
1000 block+CURRENT->nr_sectors >= acsi_part[dev].nr_sects) {
1001 #ifdef DEBUG
1002 printk( "ad%c: attempted access for blocks %d...%ld past end of device at block %ld.\n",
1003 DEVICE_NR(dev)+'a',
1004 block, block + CURRENT->nr_sectors - 1,
1005 acsi_part[dev].nr_sects);
1006 #endif
1007 end_request(0);
1008 goto repeat;
1009 }
1010 if (acsi_info[DEVICE_NR(dev)].changed) {
1011 printk( KERN_NOTICE "ad%c: request denied because cartridge has "
1012 "been changed.\n", DEVICE_NR(dev)+'a' );
1013 end_request(0);
1014 goto repeat;
1015 }
1016
1017 block += acsi_part[dev].start_sect;
1018 target = acsi_info[DEVICE_NR(dev)].target;
1019 lun = acsi_info[DEVICE_NR(dev)].lun;
1020
1021 /* Find out how many sectors should be transferred from/to
1022 * consecutive buffers and thus can be done with a single command.
1023 */
1024 buffer = CURRENT->buffer;
1025 pbuffer = virt_to_phys(buffer);
1026 nsect = CURRENT->current_nr_sectors;
1027 CurrentNReq = 1;
1028
1029 if ((bh = CURRENT->bh) && bh != CURRENT->bhtail) {
1030 if (!STRAM_ADDR(pbuffer)) {
1031 /* If transfer is done via the ACSI buffer anyway, we can
1032 * assemble as much bh's as fit in the buffer.
1033 */
1034 while( (bh = bh->b_reqnext) ) {
1035 if (nsect + (bh->b_size>>9) > ACSI_BUFFER_SECTORS) break;
1036 nsect += bh->b_size >> 9;
1037 ++CurrentNReq;
1038 if (bh == CURRENT->bhtail) break;
1039 }
1040 buffer = acsi_buffer;
1041 pbuffer = phys_acsi_buffer;
1042 }
1043 else {
1044 unsigned long pendadr, pnewadr;
1045 pendadr = pbuffer + nsect*512;
1046 while( (bh = bh->b_reqnext) ) {
1047 pnewadr = virt_to_phys(bh->b_data);
1048 if (!STRAM_ADDR(pnewadr) || pendadr != pnewadr) break;
1049 nsect += bh->b_size >> 9;
1050 pendadr = pnewadr + bh->b_size;
1051 ++CurrentNReq;
1052 if (bh == CURRENT->bhtail) break;
1053 }
1054 }
1055 }
1056 else {
1057 if (!STRAM_ADDR(pbuffer)) {
1058 buffer = acsi_buffer;
1059 pbuffer = phys_acsi_buffer;
1060 if (nsect > ACSI_BUFFER_SECTORS)
1061 nsect = ACSI_BUFFER_SECTORS;
1062 }
1063 }
1064 CurrentBuffer = buffer;
1065 CurrentNSect = nsect;
1066
1067 if (CURRENT->cmd == WRITE) {
1068 CMDSET_TARG_LUN( write_cmd, target, lun );
1069 CMDSET_BLOCK( write_cmd, block );
1070 CMDSET_LEN( write_cmd, nsect );
1071 if (buffer == acsi_buffer)
1072 copy_to_acsibuffer();
1073 dma_cache_maintenance( pbuffer, nsect*512, 1 );
1074 SET_INTR(write_intr);
1075 if (!acsicmd_dma( write_cmd, buffer, nsect, 1, 1)) {
1076 CLEAR_INTR;
1077 printk( KERN_ERR "ACSI (write): Timeout in command block\n" );
1078 bad_rw_intr();
1079 goto repeat;
1080 }
1081 SET_TIMER();
1082 return;
1083 }
1084 if (CURRENT->cmd == READ) {
1085 CMDSET_TARG_LUN( read_cmd, target, lun );
1086 CMDSET_BLOCK( read_cmd, block );
1087 CMDSET_LEN( read_cmd, nsect );
1088 SET_INTR(read_intr);
1089 if (!acsicmd_dma( read_cmd, buffer, nsect, 0, 1)) {
1090 CLEAR_INTR;
1091 printk( KERN_ERR "ACSI (read): Timeout in command block\n" );
1092 bad_rw_intr();
1093 goto repeat;
1094 }
1095 SET_TIMER();
1096 return;
1097 }
1098 panic("unknown ACSI command");
1099 }
1100
1101
1102 \f
1103 /***********************************************************************
1104 *
1105 * Misc functions: ioctl, open, release, check_change, ...
1106 *
1107 ***********************************************************************/
1108
1109
1110 static int acsi_ioctl( struct inode *inode, struct file *file,
1111 unsigned int cmd, unsigned long arg )
1112 { int dev;
1113
1114 if (!inode)
1115 return -EINVAL;
1116 dev = DEVICE_NR(MINOR(inode->i_rdev));
1117 if (dev >= NDevices)
1118 return -EINVAL;
1119 switch (cmd) {
1120 case HDIO_GETGEO:
1121 /* HDIO_GETGEO is supported more for getting the partition's
1122 * start sector... */
1123 { struct hd_geometry *geo = (struct hd_geometry *)arg;
1124 /* just fake some geometry here, it's nonsense anyway; to make it
1125 * easy, use Adaptec's usual 64/32 mapping */
1126 put_user( 64, &geo->heads );
1127 put_user( 32, &geo->sectors );
1128 put_user( acsi_info[dev].size >> 11, &geo->cylinders );
1129 put_user( acsi_part[MINOR(inode->i_rdev)].start_sect, &geo->start );
1130 return 0;
1131 }
1132
1133 case SCSI_IOCTL_GET_IDLUN:
1134 /* SCSI compatible GET_IDLUN call to get target's ID and LUN number */
1135 put_user( acsi_info[dev].target | (acsi_info[dev].lun << 8),
1136 &((Scsi_Idlun *) arg)->dev_id );
1137 put_user( 0, &((Scsi_Idlun *) arg)->host_unique_id );
1138 return 0;
1139
1140 case BLKGETSIZE: /* Return device size */
1141 return put_user(acsi_part[MINOR(inode->i_rdev)].nr_sects,
1142 (long *) arg);
1143
1144 case BLKROSET:
1145 case BLKROGET:
1146 case BLKFLSBUF:
1147 case BLKPG:
1148 return blk_ioctl(inode->i_rdev, cmd, arg);
1149
1150 case BLKRRPART: /* Re-read partition tables */
1151 if (!capable(CAP_SYS_ADMIN))
1152 return -EACCES;
1153 return revalidate_acsidisk(inode->i_rdev, 1);
1154
1155 default:
1156 return -EINVAL;
1157 }
1158 }
1159
1160
1161 /*
1162 * Open a device, check for read-only and lock the medium if it is
1163 * removable.
1164 *
1165 * Changes by Martin Rogge, 9th Aug 1995:
1166 * Check whether check_disk_change (and therefore revalidate_acsidisk)
1167 * was successful. They fail when there is no medium in the drive.
1168 *
1169 * The problem of media being changed during an operation can be
1170 * ignored because of the prevent_removal code.
1171 *
1172 * Added check for the validity of the device number.
1173 *
1174 */
1175
1176 static int acsi_open( struct inode * inode, struct file * filp )
1177 {
1178 int device;
1179 struct acsi_info_struct *aip;
1180
1181 device = DEVICE_NR(MINOR(inode->i_rdev));
1182 if (device >= NDevices)
1183 return -ENXIO;
1184 aip = &acsi_info[device];
1185 while (busy[device])
1186 sleep_on(&busy_wait);
1187
1188 if (access_count[device] == 0 && aip->removable) {
1189 #if 0
1190 aip->changed = 1; /* safety first */
1191 #endif
1192 check_disk_change( inode->i_rdev );
1193 if (aip->changed) /* revalidate was not successful (no medium) */
1194 return -ENXIO;
1195 acsi_prevent_removal(device, 1);
1196 }
1197 access_count[device]++;
1198 MOD_INC_USE_COUNT;
1199
1200 if (filp && filp->f_mode) {
1201 check_disk_change( inode->i_rdev );
1202 if (filp->f_mode & 2) {
1203 if (aip->read_only) {
1204 acsi_release( inode, filp );
1205 return -EROFS;
1206 }
1207 }
1208 }
1209
1210 return 0;
1211 }
1212
1213 /*
1214 * Releasing a block device means we sync() it, so that it can safely
1215 * be forgotten about...
1216 */
1217
1218 static int acsi_release( struct inode * inode, struct file * file )
1219 {
1220 int device = DEVICE_NR(MINOR(inode->i_rdev));
1221 if (--access_count[device] == 0 && acsi_info[device].removable)
1222 acsi_prevent_removal(device, 0);
1223 MOD_DEC_USE_COUNT;
1224 return( 0 );
1225 }
1226
1227 /*
1228 * Prevent or allow a media change for removable devices.
1229 */
1230
1231 static void acsi_prevent_removal(int device, int flag)
1232 {
1233 stdma_lock( NULL, NULL );
1234
1235 CMDSET_TARG_LUN(pa_med_rem_cmd, acsi_info[device].target,
1236 acsi_info[device].lun);
1237 CMDSET_LEN( pa_med_rem_cmd, flag );
1238
1239 if (acsicmd_nodma(pa_med_rem_cmd, 0) && acsi_wait_for_IRQ(3*HZ))
1240 acsi_getstatus();
1241 /* Do not report errors -- some devices may not know this command. */
1242
1243 ENABLE_IRQ();
1244 stdma_release();
1245 }
1246
1247 static int acsi_media_change (dev_t dev)
1248 {
1249 int device = DEVICE_NR(MINOR(dev));
1250 struct acsi_info_struct *aip;
1251
1252 aip = &acsi_info[device];
1253 if (!aip->removable)
1254 return 0;
1255
1256 if (aip->changed)
1257 /* We can be sure that the medium has been changed -- REQUEST
1258 * SENSE has reported this earlier.
1259 */
1260 return 1;
1261
1262 /* If the flag isn't set, make a test by reading block 0.
1263 * If errors happen, it seems to be better to say "changed"...
1264 */
1265 stdma_lock( NULL, NULL );
1266 CMDSET_TARG_LUN(read_cmd, aip->target, aip->lun);
1267 CMDSET_BLOCK( read_cmd, 0 );
1268 CMDSET_LEN( read_cmd, 1 );
1269 if (acsicmd_dma(read_cmd, acsi_buffer, 1, 0, 0) &&
1270 acsi_wait_for_IRQ(3*HZ)) {
1271 if (acsi_getstatus()) {
1272 if (acsi_reqsense(acsi_buffer, aip->target, aip->lun)) {
1273 if (CARTRCH_STAT(device, acsi_buffer))
1274 aip->changed = 1;
1275 }
1276 else {
1277 printk( KERN_ERR "ad%c: REQUEST SENSE failed in test for "
1278 "medium change; assuming a change\n", device + 'a' );
1279 aip->changed = 1;
1280 }
1281 }
1282 }
1283 else {
1284 printk( KERN_ERR "ad%c: Test for medium changed timed out; "
1285 "assuming a change\n", device + 'a');
1286 aip->changed = 1;
1287 }
1288 ENABLE_IRQ();
1289 stdma_release();
1290
1291 /* Now, after reading a block, the changed status is surely valid. */
1292 return aip->changed;
1293 }
1294
1295
1296 static int acsi_change_blk_size( int target, int lun)
1297
1298 { int i;
1299
1300 for (i=0; i<12; i++)
1301 acsi_buffer[i] = 0;
1302
1303 acsi_buffer[3] = 8;
1304 acsi_buffer[10] = 2;
1305 CMDSET_TARG_LUN( modeselect_cmd, target, lun);
1306
1307 if (!acsicmd_dma( modeselect_cmd, acsi_buffer, 1,1,0) ||
1308 !acsi_wait_for_IRQ( 3*HZ ) ||
1309 acsi_getstatus() != 0 ) {
1310 return(0);
1311 }
1312 return(1);
1313 }
1314
1315
1316 static int acsi_mode_sense( int target, int lun, SENSE_DATA *sd )
1317
1318 {
1319 int page;
1320
1321 CMDSET_TARG_LUN( modesense_cmd, target, lun );
1322 for (page=0; page<4; page++) {
1323 modesense_cmd[2] = page;
1324 if (!acsicmd_dma( modesense_cmd, acsi_buffer, 1, 0, 0 ) ||
1325 !acsi_wait_for_IRQ( 3*HZ ) ||
1326 acsi_getstatus())
1327 continue;
1328
1329 /* read twice to jump over the second 16-byte border! */
1330 udelay(300);
1331 if (acsi_wait_for_noIRQ( 20 ) &&
1332 acsicmd_nodma( modesense_cmd, 0 ) &&
1333 acsi_wait_for_IRQ( 3*HZ ) &&
1334 acsi_getstatus() == 0)
1335 break;
1336 }
1337 if (page == 4) {
1338 return(0);
1339 }
1340
1341 dma_cache_maintenance( phys_acsi_buffer, sizeof(SENSE_DATA), 0 );
1342 *sd = *(SENSE_DATA *)acsi_buffer;
1343
1344 /* Validity check, depending on type of data */
1345
1346 switch( SENSE_TYPE(*sd) ) {
1347
1348 case SENSE_TYPE_ATARI:
1349 if (CAPACITY(*sd) == 0)
1350 goto invalid_sense;
1351 break;
1352
1353 case SENSE_TYPE_SCSI:
1354 if (sd->scsi.descriptor_size != 8)
1355 goto invalid_sense;
1356 break;
1357
1358 case SENSE_TYPE_UNKNOWN:
1359
1360 printk( KERN_ERR "ACSI target %d, lun %d: Cannot interpret "
1361 "sense data\n", target, lun );
1362
1363 invalid_sense:
1364
1365 #ifdef DEBUG
1366 { int i;
1367 printk( "Mode sense data for ACSI target %d, lun %d seem not valid:",
1368 target, lun );
1369 for( i = 0; i < sizeof(SENSE_DATA); ++i )
1370 printk( "%02x ", (unsigned char)acsi_buffer[i] );
1371 printk( "\n" );
1372 }
1373 #endif
1374 return( 0 );
1375 }
1376
1377 return( 1 );
1378 }
1379
1380
1381
1382 /*******************************************************************
1383 *
1384 * Initialization
1385 *
1386 ********************************************************************/
1387
1388
1389 extern struct block_device_operations acsi_fops;
1390
1391 static struct gendisk acsi_gendisk = {
1392 MAJOR_NR, /* Major number */
1393 "ad", /* Major name */
1394 4, /* Bits to shift to get real from partition */
1395 1 << 4, /* Number of partitions per real */
1396 acsi_part, /* hd struct */
1397 acsi_sizes, /* block sizes */
1398 0, /* number */
1399 (void *)acsi_info, /* internal */
1400 NULL, /* next */
1401 &acsi_fops, /* file operations */
1402 };
1403
1404 #define MAX_SCSI_DEVICE_CODE 10
1405
1406 static const char *const scsi_device_types[MAX_SCSI_DEVICE_CODE] =
1407 {
1408 "Direct-Access ",
1409 "Sequential-Access",
1410 "Printer ",
1411 "Processor ",
1412 "WORM ",
1413 "CD-ROM ",
1414 "Scanner ",
1415 "Optical Device ",
1416 "Medium Changer ",
1417 "Communications "
1418 };
1419
1420 static void print_inquiry(unsigned char *data)
1421 {
1422 int i;
1423
1424 printk(KERN_INFO " Vendor: ");
1425 for (i = 8; i < 16; i++)
1426 {
1427 if (data[i] >= 0x20 && i < data[4] + 5)
1428 printk("%c", data[i]);
1429 else
1430 printk(" ");
1431 }
1432
1433 printk(" Model: ");
1434 for (i = 16; i < 32; i++)
1435 {
1436 if (data[i] >= 0x20 && i < data[4] + 5)
1437 printk("%c", data[i]);
1438 else
1439 printk(" ");
1440 }
1441
1442 printk(" Rev: ");
1443 for (i = 32; i < 36; i++)
1444 {
1445 if (data[i] >= 0x20 && i < data[4] + 5)
1446 printk("%c", data[i]);
1447 else
1448 printk(" ");
1449 }
1450
1451 printk("\n");
1452
1453 i = data[0] & 0x1f;
1454
1455 printk(KERN_INFO " Type: %s ", (i < MAX_SCSI_DEVICE_CODE
1456 ? scsi_device_types[i]
1457 : "Unknown "));
1458 printk(" ANSI SCSI revision: %02x", data[2] & 0x07);
1459 if ((data[2] & 0x07) == 1 && (data[3] & 0x0f) == 1)
1460 printk(" CCS\n");
1461 else
1462 printk("\n");
1463 }
1464
1465
1466 /*
1467 * Changes by Martin Rogge, 9th Aug 1995:
1468 * acsi_devinit has been taken out of acsi_geninit, because it needs
1469 * to be called from revalidate_acsidisk. The result of request sense
1470 * is now checked for DRIVE NOT READY.
1471 *
1472 * The structure *aip is only valid when acsi_devinit returns
1473 * DEV_SUPPORTED.
1474 *
1475 */
1476
1477 #define DEV_NONE 0
1478 #define DEV_UNKNOWN 1
1479 #define DEV_SUPPORTED 2
1480 #define DEV_SLM 3
1481
1482 static int acsi_devinit(struct acsi_info_struct *aip)
1483 {
1484 int status, got_inquiry;
1485 SENSE_DATA sense;
1486 unsigned char reqsense, extsense;
1487
1488 /*****************************************************************/
1489 /* Do a TEST UNIT READY command to test the presence of a device */
1490 /*****************************************************************/
1491
1492 CMDSET_TARG_LUN(tur_cmd, aip->target, aip->lun);
1493 if (!acsicmd_nodma(tur_cmd, 0)) {
1494 /* timed out -> no device here */
1495 #ifdef DEBUG_DETECT
1496 printk("target %d lun %d: timeout\n", aip->target, aip->lun);
1497 #endif
1498 return DEV_NONE;
1499 }
1500
1501 /*************************/
1502 /* Read the ACSI status. */
1503 /*************************/
1504
1505 status = acsi_getstatus();
1506 if (status) {
1507 if (status == 0x12) {
1508 /* The SLM printer should be the only device that
1509 * responds with the error code in the status byte. In
1510 * correct status bytes, bit 4 is never set.
1511 */
1512 printk( KERN_INFO "Detected SLM printer at id %d lun %d\n",
1513 aip->target, aip->lun);
1514 return DEV_SLM;
1515 }
1516 /* ignore CHECK CONDITION, since some devices send a
1517 UNIT ATTENTION */
1518 if ((status & 0x1e) != 0x2) {
1519 #ifdef DEBUG_DETECT
1520 printk("target %d lun %d: status %d\n",
1521 aip->target, aip->lun, status);
1522 #endif
1523 return DEV_UNKNOWN;
1524 }
1525 }
1526
1527 /*******************************/
1528 /* Do a REQUEST SENSE command. */
1529 /*******************************/
1530
1531 if (!acsi_reqsense(acsi_buffer, aip->target, aip->lun)) {
1532 printk( KERN_WARNING "acsi_reqsense failed\n");
1533 acsi_buffer[0] = 0;
1534 acsi_buffer[2] = UNIT_ATTENTION;
1535 }
1536 reqsense = acsi_buffer[0];
1537 extsense = acsi_buffer[2] & 0xf;
1538 if (status) {
1539 if ((reqsense & 0x70) == 0x70) { /* extended sense */
1540 if (extsense != UNIT_ATTENTION &&
1541 extsense != NOT_READY) {
1542 #ifdef DEBUG_DETECT
1543 printk("target %d lun %d: extended sense %d\n",
1544 aip->target, aip->lun, extsense);
1545 #endif
1546 return DEV_UNKNOWN;
1547 }
1548 }
1549 else {
1550 if (reqsense & 0x7f) {
1551 #ifdef DEBUG_DETECT
1552 printk("target %d lun %d: sense %d\n",
1553 aip->target, aip->lun, reqsense);
1554 #endif
1555 return DEV_UNKNOWN;
1556 }
1557 }
1558 }
1559 else
1560 if (reqsense == 0x4) { /* SH204 Bug workaround */
1561 #ifdef DEBUG_DETECT
1562 printk("target %d lun %d status=0 sense=4\n",
1563 aip->target, aip->lun);
1564 #endif
1565 return DEV_UNKNOWN;
1566 }
1567
1568 /***********************************************************/
1569 /* Do an INQUIRY command to get more infos on this device. */
1570 /***********************************************************/
1571
1572 /* Assume default values */
1573 aip->removable = 1;
1574 aip->read_only = 0;
1575 aip->old_atari_disk = 0;
1576 aip->changed = (extsense == NOT_READY); /* medium inserted? */
1577 aip->size = DEFAULT_SIZE;
1578 got_inquiry = 0;
1579 /* Fake inquiry result for old atari disks */
1580 memcpy(acsi_buffer, "\000\000\001\000 Adaptec 40xx"
1581 " ", 40);
1582 CMDSET_TARG_LUN(inquiry_cmd, aip->target, aip->lun);
1583 if (acsicmd_dma(inquiry_cmd, acsi_buffer, 1, 0, 0) &&
1584 acsi_getstatus() == 0) {
1585 acsicmd_nodma(inquiry_cmd, 0);
1586 acsi_getstatus();
1587 dma_cache_maintenance( phys_acsi_buffer, 256, 0 );
1588 got_inquiry = 1;
1589 aip->removable = !!(acsi_buffer[1] & 0x80);
1590 }
1591 if (aip->type == NONE) /* only at boot time */
1592 print_inquiry(acsi_buffer);
1593 switch(acsi_buffer[0]) {
1594 case TYPE_DISK:
1595 aip->type = HARDDISK;
1596 break;
1597 case TYPE_ROM:
1598 aip->type = CDROM;
1599 aip->read_only = 1;
1600 break;
1601 default:
1602 return DEV_UNKNOWN;
1603 }
1604 /****************************/
1605 /* Do a MODE SENSE command. */
1606 /****************************/
1607
1608 if (!acsi_mode_sense(aip->target, aip->lun, &sense)) {
1609 printk( KERN_WARNING "No mode sense data.\n" );
1610 return DEV_UNKNOWN;
1611 }
1612 if ((SECTOR_SIZE(sense) != 512) &&
1613 ((aip->type != CDROM) ||
1614 !acsi_change_blk_size(aip->target, aip->lun) ||
1615 !acsi_mode_sense(aip->target, aip->lun, &sense) ||
1616 (SECTOR_SIZE(sense) != 512))) {
1617 printk( KERN_WARNING "Sector size != 512 not supported.\n" );
1618 return DEV_UNKNOWN;
1619 }
1620 /* There are disks out there that claim to have 0 sectors... */
1621 if (CAPACITY(sense))
1622 aip->size = CAPACITY(sense); /* else keep DEFAULT_SIZE */
1623 if (!got_inquiry && SENSE_TYPE(sense) == SENSE_TYPE_ATARI) {
1624 /* If INQUIRY failed and the sense data suggest an old
1625 * Atari disk (SH20x, Megafile), the disk is not removable
1626 */
1627 aip->removable = 0;
1628 aip->old_atari_disk = 1;
1629 }
1630
1631 /******************/
1632 /* We've done it. */
1633 /******************/
1634
1635 return DEV_SUPPORTED;
1636 }
1637
1638 EXPORT_SYMBOL(acsi_delay_start);
1639 EXPORT_SYMBOL(acsi_delay_end);
1640 EXPORT_SYMBOL(acsi_wait_for_IRQ);
1641 EXPORT_SYMBOL(acsi_wait_for_noIRQ);
1642 EXPORT_SYMBOL(acsicmd_nodma);
1643 EXPORT_SYMBOL(acsi_getstatus);
1644 EXPORT_SYMBOL(acsi_buffer);
1645 EXPORT_SYMBOL(phys_acsi_buffer);
1646
1647 #ifdef CONFIG_ATARI_SLM_MODULE
1648 void acsi_attach_SLMs( int (*attach_func)( int, int ) );
1649
1650 EXPORT_SYMBOL(acsi_extstatus);
1651 EXPORT_SYMBOL(acsi_end_extstatus);
1652 EXPORT_SYMBOL(acsi_extcmd);
1653 EXPORT_SYMBOL(acsi_attach_SLMs);
1654
1655 /* to remember IDs of SLM devices, SLM module is loaded later
1656 * (index is target#, contents is lun#, -1 means "no SLM") */
1657 int SLM_devices[8];
1658 #endif
1659
1660 static struct block_device_operations acsi_fops = {
1661 open: acsi_open,
1662 release: acsi_release,
1663 ioctl: acsi_ioctl,
1664 check_media_change: acsi_media_change,
1665 revalidate: acsi_revalidate,
1666 };
1667
1668 static void acsi_geninit(void)
1669 {
1670 int i, target, lun;
1671 struct acsi_info_struct *aip;
1672 #ifdef CONFIG_ATARI_SLM
1673 int n_slm = 0;
1674 #endif
1675
1676 printk( KERN_INFO "Probing ACSI devices:\n" );
1677 NDevices = 0;
1678 #ifdef CONFIG_ATARI_SLM_MODULE
1679 for( i = 0; i < 8; ++i )
1680 SLM_devices[i] = -1;
1681 #endif
1682 stdma_lock(NULL, NULL);
1683
1684 for (target = 0; target < 8 && NDevices < MAX_DEV; ++target) {
1685 lun = 0;
1686 do {
1687 aip = &acsi_info[NDevices];
1688 aip->type = NONE;
1689 aip->target = target;
1690 aip->lun = lun;
1691 i = acsi_devinit(aip);
1692 switch (i) {
1693 case DEV_SUPPORTED:
1694 printk( KERN_INFO "Detected ");
1695 switch (aip->type) {
1696 case HARDDISK:
1697 printk("disk");
1698 break;
1699 case CDROM:
1700 printk("cdrom");
1701 break;
1702 default:
1703 }
1704 printk(" ad%c at id %d lun %d ",
1705 'a' + NDevices, target, lun);
1706 if (aip->removable)
1707 printk("(removable) ");
1708 if (aip->read_only)
1709 printk("(read-only) ");
1710 if (aip->size == DEFAULT_SIZE)
1711 printk(" unkown size, using default ");
1712 printk("%ld MByte\n",
1713 (aip->size*512+1024*1024/2)/(1024*1024));
1714 NDevices++;
1715 break;
1716 case DEV_SLM:
1717 #ifdef CONFIG_ATARI_SLM
1718 n_slm += attach_slm( target, lun );
1719 break;
1720 #endif
1721 #ifdef CONFIG_ATARI_SLM_MODULE
1722 SLM_devices[target] = lun;
1723 break;
1724 #endif
1725 /* neither of the above: fall through to unknown device */
1726 case DEV_UNKNOWN:
1727 printk( KERN_INFO "Detected unsupported device at "
1728 "id %d lun %d\n", target, lun);
1729 break;
1730 }
1731 }
1732 #ifdef CONFIG_ACSI_MULTI_LUN
1733 while (i != DEV_NONE && ++lun < MAX_LUN);
1734 #else
1735 while (0);
1736 #endif
1737 }
1738
1739 /* reenable interrupt */
1740 ENABLE_IRQ();
1741 stdma_release();
1742
1743 #ifndef CONFIG_ATARI_SLM
1744 printk( KERN_INFO "Found %d ACSI device(s) total.\n", NDevices );
1745 #else
1746 printk( KERN_INFO "Found %d ACSI device(s) and %d SLM printer(s) total.\n",
1747 NDevices, n_slm );
1748 #endif
1749
1750 for( i = 0; i < (MAX_DEV << 4); i++ )
1751 acsi_blocksizes[i] = 1024;
1752 blksize_size[MAJOR_NR] = acsi_blocksizes;
1753 for( i = 0; i < NDevices; ++i )
1754 register_disk(&acsi_gendisk, MKDEV(MAJOR_NR,i<<4),
1755 (acsi_info[i].type==HARDDISK)?1<<4:1,
1756 &acsi_fops,
1757 acsi_info[i].size);
1758 acsi_gendisk.nr_real = NDevices;
1759 }
1760
1761 #ifdef CONFIG_ATARI_SLM_MODULE
1762 /* call attach_slm() for each device that is a printer; needed for init of SLM
1763 * driver as a module, since it's not yet present if acsi.c is inited and thus
1764 * the bus gets scanned. */
1765 void acsi_attach_SLMs( int (*attach_func)( int, int ) )
1766 {
1767 int i, n = 0;
1768
1769 for( i = 0; i < 8; ++i )
1770 if (SLM_devices[i] >= 0)
1771 n += (*attach_func)( i, SLM_devices[i] );
1772 printk( KERN_INFO "Found %d SLM printer(s) total.\n", n );
1773 }
1774 #endif /* CONFIG_ATARI_SLM_MODULE */
1775
1776
1777 int acsi_init( void )
1778
1779 {
1780 int err = 0;
1781 if (!MACH_IS_ATARI || !ATARIHW_PRESENT(ACSI))
1782 return 0;
1783 if (devfs_register_blkdev( MAJOR_NR, "ad", &acsi_fops )) {
1784 printk( KERN_ERR "Unable to get major %d for ACSI\n", MAJOR_NR );
1785 return -EBUSY;
1786 }
1787 if (!(acsi_buffer =
1788 (char *)atari_stram_alloc(ACSI_BUFFER_SIZE, "acsi"))) {
1789 printk( KERN_ERR "Unable to get ACSI ST-Ram buffer.\n" );
1790 devfs_unregister_blkdev( MAJOR_NR, "ad" );
1791 return -ENOMEM;
1792 }
1793 phys_acsi_buffer = virt_to_phys( acsi_buffer );
1794 STramMask = ATARIHW_PRESENT(EXTD_DMA) ? 0x00000000 : 0xff000000;
1795
1796 blk_init_queue(BLK_DEFAULT_QUEUE(MAJOR_NR), DEVICE_REQUEST);
1797 read_ahead[MAJOR_NR] = 8; /* 8 sector (4kB) read-ahead */
1798 acsi_gendisk.next = gendisk_head;
1799 gendisk_head = &acsi_gendisk;
1800
1801 #ifdef CONFIG_ATARI_SLM
1802 err = slm_init();
1803 #endif
1804 if (!err)
1805 acsi_geninit();
1806 return err;
1807 }
1808
1809
1810 #ifdef MODULE
1811 int init_module(void)
1812 {
1813 int err;
1814
1815 if ((err = acsi_init()))
1816 return( err );
1817 printk( KERN_INFO "ACSI driver loaded as module.\n");
1818 return( 0 );
1819 }
1820
1821 void cleanup_module(void)
1822 {
1823 struct gendisk ** gdp;
1824
1825 del_timer( &acsi_timer );
1826 blk_cleanup_queue(BLK_DEFAULT_QUEUE(MAJOR_NR));
1827 atari_stram_free( acsi_buffer );
1828
1829 if (devfs_unregister_blkdev( MAJOR_NR, "ad" ) != 0)
1830 printk( KERN_ERR "acsi: cleanup_module failed\n");
1831
1832 for (gdp = &gendisk_head; *gdp; gdp = &((*gdp)->next))
1833 if (*gdp == &acsi_gendisk)
1834 break;
1835 if (!*gdp)
1836 printk( KERN_ERR "acsi: entry in disk chain missing!\n" );
1837 else
1838 *gdp = (*gdp)->next;
1839 }
1840 #endif
1841
1842 #define DEVICE_BUSY busy[device]
1843 #define USAGE access_count[device]
1844 #define GENDISK_STRUCT acsi_gendisk
1845
1846 /*
1847 * This routine is called to flush all partitions and partition tables
1848 * for a changed scsi disk, and then re-read the new partition table.
1849 * If we are revalidating a disk because of a media change, then we
1850 * enter with usage == 0. If we are using an ioctl, we automatically have
1851 * usage == 1 (we need an open channel to use an ioctl :-), so this
1852 * is our limit.
1853 *
1854 * Changes by Martin Rogge, 9th Aug 1995:
1855 * got cd-roms to work by calling acsi_devinit. There are only two problems:
1856 * First, if there is no medium inserted, the status will remain "changed".
1857 * That is no problem at all, but our design of three-valued logic (medium
1858 * changed, medium not changed, no medium inserted).
1859 * Secondly the check could fail completely and the drive could deliver
1860 * nonsensical data, which could mess up the acsi_info[] structure. In
1861 * that case we try to make the entry safe.
1862 *
1863 */
1864
1865 static int revalidate_acsidisk( int dev, int maxusage )
1866 {
1867 int device;
1868 struct gendisk * gdev;
1869 int max_p, start, i;
1870 struct acsi_info_struct *aip;
1871
1872 device = DEVICE_NR(MINOR(dev));
1873 aip = &acsi_info[device];
1874 gdev = &GENDISK_STRUCT;
1875
1876 cli();
1877 if (DEVICE_BUSY || USAGE > maxusage) {
1878 sti();
1879 return -EBUSY;
1880 };
1881 DEVICE_BUSY = 1;
1882 sti();
1883
1884 max_p = gdev->max_p;
1885 start = device << gdev->minor_shift;
1886
1887 for( i = max_p - 1; i >= 0 ; i-- ) {
1888 if (gdev->part[start + i].nr_sects != 0) {
1889 kdev_t devp = MKDEV(MAJOR_NR, start + i);
1890 struct super_block *sb = get_super(devp);
1891
1892 fsync_dev(devp);
1893 if (sb)
1894 invalidate_inodes(sb);
1895 invalidate_buffers(devp);
1896 gdev->part[start + i].nr_sects = 0;
1897 }
1898 gdev->part[start+i].start_sect = 0;
1899 };
1900
1901 stdma_lock( NULL, NULL );
1902
1903 if (acsi_devinit(aip) != DEV_SUPPORTED) {
1904 printk( KERN_ERR "ACSI: revalidate failed for target %d lun %d\n",
1905 aip->target, aip->lun);
1906 aip->size = 0;
1907 aip->read_only = 1;
1908 aip->removable = 1;
1909 aip->changed = 1; /* next acsi_open will try again... */
1910 }
1911
1912 ENABLE_IRQ();
1913 stdma_release();
1914
1915 grok_partitions(gdev, device, (aip->type==HARDDISK)?1<<4:1, aip->size);
1916
1917 DEVICE_BUSY = 0;
1918 wake_up(&busy_wait);
1919 return 0;
1920 }
1921
1922
1923 static int acsi_revalidate (dev_t dev)
1924 {
1925 return revalidate_acsidisk (dev, 0);
1926 }
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