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1 | /* |
2 | * atari_scsi.c -- Device dependent functions for the Atari generic SCSI port |
3 | * |
4 | * Copyright 1994 Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de> |
5 | * |
6 | * Loosely based on the work of Robert De Vries' team and added: |
7 | * - working real DMA |
8 | * - Falcon support (untested yet!) ++bjoern fixed and now it works |
9 | * - lots of extensions and bug fixes. |
10 | * |
11 | * This file is subject to the terms and conditions of the GNU General Public |
12 | * License. See the file COPYING in the main directory of this archive |
13 | * for more details. |
14 | * |
15 | */ |
16 | |
17 | |
18 | /**************************************************************************/ |
19 | /* */ |
20 | /* Notes for Falcon SCSI: */ |
21 | /* ---------------------- */ |
22 | /* */ |
23 | /* Since the Falcon SCSI uses the ST-DMA chip, that is shared among */ |
24 | /* several device drivers, locking and unlocking the access to this */ |
25 | /* chip is required. But locking is not possible from an interrupt, */ |
26 | /* since it puts the process to sleep if the lock is not available. */ |
27 | /* This prevents "late" locking of the DMA chip, i.e. locking it just */ |
28 | /* before using it, since in case of disconnection-reconnection */ |
29 | /* commands, the DMA is started from the reselection interrupt. */ |
30 | /* */ |
31 | /* Two possible schemes for ST-DMA-locking would be: */ |
32 | /* 1) The lock is taken for each command separately and disconnecting */ |
33 | /* is forbidden (i.e. can_queue = 1). */ |
34 | /* 2) The DMA chip is locked when the first command comes in and */ |
35 | /* released when the last command is finished and all queues are */ |
36 | /* empty. */ |
37 | /* The first alternative would result in bad performance, since the */ |
38 | /* interleaving of commands would not be used. The second is unfair to */ |
39 | /* other drivers using the ST-DMA, because the queues will seldom be */ |
40 | /* totally empty if there is a lot of disk traffic. */ |
41 | /* */ |
42 | /* For this reasons I decided to employ a more elaborate scheme: */ |
43 | /* - First, we give up the lock every time we can (for fairness), this */ |
44 | /* means every time a command finishes and there are no other commands */ |
45 | /* on the disconnected queue. */ |
46 | /* - If there are others waiting to lock the DMA chip, we stop */ |
47 | /* issuing commands, i.e. moving them onto the issue queue. */ |
48 | /* Because of that, the disconnected queue will run empty in a */ |
49 | /* while. Instead we go to sleep on a 'fairness_queue'. */ |
50 | /* - If the lock is released, all processes waiting on the fairness */ |
51 | /* queue will be woken. The first of them tries to re-lock the DMA, */ |
52 | /* the others wait for the first to finish this task. After that, */ |
53 | /* they can all run on and do their commands... */ |
54 | /* This sounds complicated (and it is it :-(), but it seems to be a */ |
55 | /* good compromise between fairness and performance: As long as no one */ |
56 | /* else wants to work with the ST-DMA chip, SCSI can go along as */ |
57 | /* usual. If now someone else comes, this behaviour is changed to a */ |
58 | /* "fairness mode": just already initiated commands are finished and */ |
59 | /* then the lock is released. The other one waiting will probably win */ |
60 | /* the race for locking the DMA, since it was waiting for longer. And */ |
61 | /* after it has finished, SCSI can go ahead again. Finally: I hope I */ |
62 | /* have not produced any deadlock possibilities! */ |
63 | /* */ |
64 | /**************************************************************************/ |
65 | |
66 | |
67 | |
68 | #include <linux/module.h> |
69 | |
70 | #define NDEBUG (0) |
71 | |
72 | #define NDEBUG_ABORT 0x00100000 |
73 | #define NDEBUG_TAGS 0x00200000 |
74 | #define NDEBUG_MERGING 0x00400000 |
75 | |
76 | #define AUTOSENSE |
77 | /* For the Atari version, use only polled IO or REAL_DMA */ |
78 | #define REAL_DMA |
79 | /* Support tagged queuing? (on devices that are able to... :-) */ |
80 | #define SUPPORT_TAGS |
81 | #define MAX_TAGS 32 |
82 | |
83 | #include <linux/types.h> |
84 | #include <linux/stddef.h> |
85 | #include <linux/ctype.h> |
86 | #include <linux/delay.h> |
87 | #include <linux/mm.h> |
88 | #include <linux/blkdev.h> |
89 | #include <linux/interrupt.h> |
90 | #include <linux/init.h> |
91 | #include <linux/nvram.h> |
92 | #include <linux/bitops.h> |
93 | |
94 | #include <asm/setup.h> |
95 | #include <asm/atarihw.h> |
96 | #include <asm/atariints.h> |
97 | #include <asm/page.h> |
98 | #include <asm/pgtable.h> |
99 | #include <asm/irq.h> |
100 | #include <asm/traps.h> |
101 | |
102 | #include "scsi.h" |
103 | #include <scsi/scsi_host.h> |
104 | #include "atari_scsi.h" |
105 | #include "NCR5380.h" |
106 | #include <asm/atari_stdma.h> |
107 | #include <asm/atari_stram.h> |
108 | #include <asm/io.h> |
109 | |
110 | #include <linux/stat.h> |
111 | |
112 | #define IS_A_TT() ATARIHW_PRESENT(TT_SCSI) |
113 | |
114 | #define SCSI_DMA_WRITE_P(elt,val) \ |
115 | do { \ |
116 | unsigned long v = val; \ |
117 | tt_scsi_dma.elt##_lo = v & 0xff; \ |
118 | v >>= 8; \ |
119 | tt_scsi_dma.elt##_lmd = v & 0xff; \ |
120 | v >>= 8; \ |
121 | tt_scsi_dma.elt##_hmd = v & 0xff; \ |
122 | v >>= 8; \ |
123 | tt_scsi_dma.elt##_hi = v & 0xff; \ |
124 | } while(0) |
125 | |
126 | #define SCSI_DMA_READ_P(elt) \ |
127 | (((((((unsigned long)tt_scsi_dma.elt##_hi << 8) | \ |
128 | (unsigned long)tt_scsi_dma.elt##_hmd) << 8) | \ |
129 | (unsigned long)tt_scsi_dma.elt##_lmd) << 8) | \ |
130 | (unsigned long)tt_scsi_dma.elt##_lo) |
131 | |
132 | |
133 | static inline void SCSI_DMA_SETADR(unsigned long adr) |
134 | { |
135 | st_dma.dma_lo = (unsigned char)adr; |
136 | MFPDELAY(); |
137 | adr >>= 8; |
138 | st_dma.dma_md = (unsigned char)adr; |
139 | MFPDELAY(); |
140 | adr >>= 8; |
141 | st_dma.dma_hi = (unsigned char)adr; |
142 | MFPDELAY(); |
143 | } |
144 | |
145 | static inline unsigned long SCSI_DMA_GETADR(void) |
146 | { |
147 | unsigned long adr; |
148 | adr = st_dma.dma_lo; |
149 | MFPDELAY(); |
150 | adr |= (st_dma.dma_md & 0xff) << 8; |
151 | MFPDELAY(); |
152 | adr |= (st_dma.dma_hi & 0xff) << 16; |
153 | MFPDELAY(); |
154 | return adr; |
155 | } |
156 | |
157 | static inline void ENABLE_IRQ(void) |
158 | { |
159 | if (IS_A_TT()) |
160 | atari_enable_irq(IRQ_TT_MFP_SCSI); |
161 | else |
162 | atari_enable_irq(IRQ_MFP_FSCSI); |
163 | } |
164 | |
165 | static inline void DISABLE_IRQ(void) |
166 | { |
167 | if (IS_A_TT()) |
168 | atari_disable_irq(IRQ_TT_MFP_SCSI); |
169 | else |
170 | atari_disable_irq(IRQ_MFP_FSCSI); |
171 | } |
172 | |
173 | |
174 | #define HOSTDATA_DMALEN (((struct NCR5380_hostdata *) \ |
175 | (atari_scsi_host->hostdata))->dma_len) |
176 | |
177 | /* Time (in jiffies) to wait after a reset; the SCSI standard calls for 250ms, |
178 | * we usually do 0.5s to be on the safe side. But Toshiba CD-ROMs once more |
179 | * need ten times the standard value... */ |
180 | #ifndef CONFIG_ATARI_SCSI_TOSHIBA_DELAY |
181 | #define AFTER_RESET_DELAY (HZ/2) |
182 | #else |
183 | #define AFTER_RESET_DELAY (5*HZ/2) |
184 | #endif |
185 | |
186 | /***************************** Prototypes *****************************/ |
187 | |
188 | #ifdef REAL_DMA |
189 | static int scsi_dma_is_ignored_buserr(unsigned char dma_stat); |
190 | static void atari_scsi_fetch_restbytes(void); |
191 | static long atari_scsi_dma_residual(struct Scsi_Host *instance); |
192 | static int falcon_classify_cmd(Scsi_Cmnd *cmd); |
193 | static unsigned long atari_dma_xfer_len(unsigned long wanted_len, |
194 | Scsi_Cmnd *cmd, int write_flag); |
195 | #endif |
196 | static irqreturn_t scsi_tt_intr(int irq, void *dummy); |
197 | static irqreturn_t scsi_falcon_intr(int irq, void *dummy); |
198 | static void falcon_release_lock_if_possible(struct NCR5380_hostdata *hostdata); |
199 | static void falcon_get_lock(void); |
200 | #ifdef CONFIG_ATARI_SCSI_RESET_BOOT |
201 | static void atari_scsi_reset_boot(void); |
202 | #endif |
203 | static unsigned char atari_scsi_tt_reg_read(unsigned char reg); |
204 | static void atari_scsi_tt_reg_write(unsigned char reg, unsigned char value); |
205 | static unsigned char atari_scsi_falcon_reg_read(unsigned char reg); |
206 | static void atari_scsi_falcon_reg_write(unsigned char reg, unsigned char value); |
207 | |
208 | /************************* End of Prototypes **************************/ |
209 | |
210 | |
211 | static struct Scsi_Host *atari_scsi_host; |
212 | static unsigned char (*atari_scsi_reg_read)(unsigned char reg); |
213 | static void (*atari_scsi_reg_write)(unsigned char reg, unsigned char value); |
214 | |
215 | #ifdef REAL_DMA |
216 | static unsigned long atari_dma_residual, atari_dma_startaddr; |
217 | static short atari_dma_active; |
218 | /* pointer to the dribble buffer */ |
219 | static char *atari_dma_buffer; |
220 | /* precalculated physical address of the dribble buffer */ |
221 | static unsigned long atari_dma_phys_buffer; |
222 | /* != 0 tells the Falcon int handler to copy data from the dribble buffer */ |
223 | static char *atari_dma_orig_addr; |
224 | /* size of the dribble buffer; 4k seems enough, since the Falcon cannot use |
225 | * scatter-gather anyway, so most transfers are 1024 byte only. In the rare |
226 | * cases where requests to physical contiguous buffers have been merged, this |
227 | * request is <= 4k (one page). So I don't think we have to split transfers |
228 | * just due to this buffer size... |
229 | */ |
230 | #define STRAM_BUFFER_SIZE (4096) |
231 | /* mask for address bits that can't be used with the ST-DMA */ |
232 | static unsigned long atari_dma_stram_mask; |
233 | #define STRAM_ADDR(a) (((a) & atari_dma_stram_mask) == 0) |
234 | /* number of bytes to cut from a transfer to handle NCR overruns */ |
235 | static int atari_read_overruns; |
236 | #endif |
237 | |
238 | static int setup_can_queue = -1; |
239 | module_param(setup_can_queue, int, 0); |
240 | static int setup_cmd_per_lun = -1; |
241 | module_param(setup_cmd_per_lun, int, 0); |
242 | static int setup_sg_tablesize = -1; |
243 | module_param(setup_sg_tablesize, int, 0); |
244 | #ifdef SUPPORT_TAGS |
245 | static int setup_use_tagged_queuing = -1; |
246 | module_param(setup_use_tagged_queuing, int, 0); |
247 | #endif |
248 | static int setup_hostid = -1; |
249 | module_param(setup_hostid, int, 0); |
250 | |
251 | |
252 | #if defined(REAL_DMA) |
253 | |
254 | static int scsi_dma_is_ignored_buserr(unsigned char dma_stat) |
255 | { |
256 | int i; |
257 | unsigned long addr = SCSI_DMA_READ_P(dma_addr), end_addr; |
258 | |
259 | if (dma_stat & 0x01) { |
260 | |
261 | /* A bus error happens when DMA-ing from the last page of a |
262 | * physical memory chunk (DMA prefetch!), but that doesn't hurt. |
263 | * Check for this case: |
264 | */ |
265 | |
266 | for (i = 0; i < m68k_num_memory; ++i) { |
267 | end_addr = m68k_memory[i].addr + m68k_memory[i].size; |
268 | if (end_addr <= addr && addr <= end_addr + 4) |
269 | return 1; |
270 | } |
271 | } |
272 | return 0; |
273 | } |
274 | |
275 | |
276 | #if 0 |
277 | /* Dead code... wasn't called anyway :-) and causes some trouble, because at |
278 | * end-of-DMA, both SCSI ints are triggered simultaneously, so the NCR int has |
279 | * to clear the DMA int pending bit before it allows other level 6 interrupts. |
280 | */ |
281 | static void scsi_dma_buserr(int irq, void *dummy) |
282 | { |
283 | unsigned char dma_stat = tt_scsi_dma.dma_ctrl; |
284 | |
285 | /* Don't do anything if a NCR interrupt is pending. Probably it's just |
286 | * masked... */ |
287 | if (atari_irq_pending(IRQ_TT_MFP_SCSI)) |
288 | return; |
289 | |
290 | printk("Bad SCSI DMA interrupt! dma_addr=0x%08lx dma_stat=%02x dma_cnt=%08lx\n", |
291 | SCSI_DMA_READ_P(dma_addr), dma_stat, SCSI_DMA_READ_P(dma_cnt)); |
292 | if (dma_stat & 0x80) { |
293 | if (!scsi_dma_is_ignored_buserr(dma_stat)) |
294 | printk("SCSI DMA bus error -- bad DMA programming!\n"); |
295 | } else { |
296 | /* Under normal circumstances we never should get to this point, |
297 | * since both interrupts are triggered simultaneously and the 5380 |
298 | * int has higher priority. When this irq is handled, that DMA |
299 | * interrupt is cleared. So a warning message is printed here. |
300 | */ |
301 | printk("SCSI DMA intr ?? -- this shouldn't happen!\n"); |
302 | } |
303 | } |
304 | #endif |
305 | |
306 | #endif |
307 | |
308 | |
309 | static irqreturn_t scsi_tt_intr(int irq, void *dummy) |
310 | { |
311 | #ifdef REAL_DMA |
312 | int dma_stat; |
313 | |
314 | dma_stat = tt_scsi_dma.dma_ctrl; |
315 | |
316 | INT_PRINTK("scsi%d: NCR5380 interrupt, DMA status = %02x\n", |
317 | atari_scsi_host->host_no, dma_stat & 0xff); |
318 | |
319 | /* Look if it was the DMA that has interrupted: First possibility |
320 | * is that a bus error occurred... |
321 | */ |
322 | if (dma_stat & 0x80) { |
323 | if (!scsi_dma_is_ignored_buserr(dma_stat)) { |
324 | printk(KERN_ERR "SCSI DMA caused bus error near 0x%08lx\n", |
325 | SCSI_DMA_READ_P(dma_addr)); |
326 | printk(KERN_CRIT "SCSI DMA bus error -- bad DMA programming!"); |
327 | } |
328 | } |
329 | |
330 | /* If the DMA is active but not finished, we have the case |
331 | * that some other 5380 interrupt occurred within the DMA transfer. |
332 | * This means we have residual bytes, if the desired end address |
333 | * is not yet reached. Maybe we have to fetch some bytes from the |
334 | * rest data register, too. The residual must be calculated from |
335 | * the address pointer, not the counter register, because only the |
336 | * addr reg counts bytes not yet written and pending in the rest |
337 | * data reg! |
338 | */ |
339 | if ((dma_stat & 0x02) && !(dma_stat & 0x40)) { |
340 | atari_dma_residual = HOSTDATA_DMALEN - (SCSI_DMA_READ_P(dma_addr) - atari_dma_startaddr); |
341 | |
342 | DMA_PRINTK("SCSI DMA: There are %ld residual bytes.\n", |
343 | atari_dma_residual); |
344 | |
345 | if ((signed int)atari_dma_residual < 0) |
346 | atari_dma_residual = 0; |
347 | if ((dma_stat & 1) == 0) { |
348 | /* |
349 | * After read operations, we maybe have to |
350 | * transport some rest bytes |
351 | */ |
352 | atari_scsi_fetch_restbytes(); |
353 | } else { |
354 | /* |
355 | * There seems to be a nasty bug in some SCSI-DMA/NCR |
356 | * combinations: If a target disconnects while a write |
357 | * operation is going on, the address register of the |
358 | * DMA may be a few bytes farer than it actually read. |
359 | * This is probably due to DMA prefetching and a delay |
360 | * between DMA and NCR. Experiments showed that the |
361 | * dma_addr is 9 bytes to high, but this could vary. |
362 | * The problem is, that the residual is thus calculated |
363 | * wrong and the next transfer will start behind where |
364 | * it should. So we round up the residual to the next |
365 | * multiple of a sector size, if it isn't already a |
366 | * multiple and the originally expected transfer size |
367 | * was. The latter condition is there to ensure that |
368 | * the correction is taken only for "real" data |
369 | * transfers and not for, e.g., the parameters of some |
370 | * other command. These shouldn't disconnect anyway. |
371 | */ |
372 | if (atari_dma_residual & 0x1ff) { |
373 | DMA_PRINTK("SCSI DMA: DMA bug corrected, " |
374 | "difference %ld bytes\n", |
375 | 512 - (atari_dma_residual & 0x1ff)); |
376 | atari_dma_residual = (atari_dma_residual + 511) & ~0x1ff; |
377 | } |
378 | } |
379 | tt_scsi_dma.dma_ctrl = 0; |
380 | } |
381 | |
382 | /* If the DMA is finished, fetch the rest bytes and turn it off */ |
383 | if (dma_stat & 0x40) { |
384 | atari_dma_residual = 0; |
385 | if ((dma_stat & 1) == 0) |
386 | atari_scsi_fetch_restbytes(); |
387 | tt_scsi_dma.dma_ctrl = 0; |
388 | } |
389 | |
390 | #endif /* REAL_DMA */ |
391 | |
392 | NCR5380_intr(irq, dummy); |
393 | |
394 | #if 0 |
395 | /* To be sure the int is not masked */ |
396 | atari_enable_irq(IRQ_TT_MFP_SCSI); |
397 | #endif |
398 | return IRQ_HANDLED; |
399 | } |
400 | |
401 | |
402 | static irqreturn_t scsi_falcon_intr(int irq, void *dummy) |
403 | { |
404 | #ifdef REAL_DMA |
405 | int dma_stat; |
406 | |
407 | /* Turn off DMA and select sector counter register before |
408 | * accessing the status register (Atari recommendation!) |
409 | */ |
410 | st_dma.dma_mode_status = 0x90; |
411 | dma_stat = st_dma.dma_mode_status; |
412 | |
413 | /* Bit 0 indicates some error in the DMA process... don't know |
414 | * what happened exactly (no further docu). |
415 | */ |
416 | if (!(dma_stat & 0x01)) { |
417 | /* DMA error */ |
418 | printk(KERN_CRIT "SCSI DMA error near 0x%08lx!\n", SCSI_DMA_GETADR()); |
419 | } |
420 | |
421 | /* If the DMA was active, but now bit 1 is not clear, it is some |
422 | * other 5380 interrupt that finishes the DMA transfer. We have to |
423 | * calculate the number of residual bytes and give a warning if |
424 | * bytes are stuck in the ST-DMA fifo (there's no way to reach them!) |
425 | */ |
426 | if (atari_dma_active && (dma_stat & 0x02)) { |
427 | unsigned long transferred; |
428 | |
429 | transferred = SCSI_DMA_GETADR() - atari_dma_startaddr; |
430 | /* The ST-DMA address is incremented in 2-byte steps, but the |
431 | * data are written only in 16-byte chunks. If the number of |
432 | * transferred bytes is not divisible by 16, the remainder is |
433 | * lost somewhere in outer space. |
434 | */ |
435 | if (transferred & 15) |
436 | printk(KERN_ERR "SCSI DMA error: %ld bytes lost in " |
437 | "ST-DMA fifo\n", transferred & 15); |
438 | |
439 | atari_dma_residual = HOSTDATA_DMALEN - transferred; |
440 | DMA_PRINTK("SCSI DMA: There are %ld residual bytes.\n", |
441 | atari_dma_residual); |
442 | } else |
443 | atari_dma_residual = 0; |
444 | atari_dma_active = 0; |
445 | |
446 | if (atari_dma_orig_addr) { |
447 | /* If the dribble buffer was used on a read operation, copy the DMA-ed |
448 | * data to the original destination address. |
449 | */ |
450 | memcpy(atari_dma_orig_addr, phys_to_virt(atari_dma_startaddr), |
451 | HOSTDATA_DMALEN - atari_dma_residual); |
452 | atari_dma_orig_addr = NULL; |
453 | } |
454 | |
455 | #endif /* REAL_DMA */ |
456 | |
457 | NCR5380_intr(irq, dummy); |
458 | return IRQ_HANDLED; |
459 | } |
460 | |
461 | |
462 | #ifdef REAL_DMA |
463 | static void atari_scsi_fetch_restbytes(void) |
464 | { |
465 | int nr; |
466 | char *src, *dst; |
467 | unsigned long phys_dst; |
468 | |
469 | /* fetch rest bytes in the DMA register */ |
470 | phys_dst = SCSI_DMA_READ_P(dma_addr); |
471 | nr = phys_dst & 3; |
472 | if (nr) { |
473 | /* there are 'nr' bytes left for the last long address |
474 | before the DMA pointer */ |
475 | phys_dst ^= nr; |
476 | DMA_PRINTK("SCSI DMA: there are %d rest bytes for phys addr 0x%08lx", |
477 | nr, phys_dst); |
478 | /* The content of the DMA pointer is a physical address! */ |
479 | dst = phys_to_virt(phys_dst); |
480 | DMA_PRINTK(" = virt addr %p\n", dst); |
481 | for (src = (char *)&tt_scsi_dma.dma_restdata; nr != 0; --nr) |
482 | *dst++ = *src++; |
483 | } |
484 | } |
485 | #endif /* REAL_DMA */ |
486 | |
487 | |
488 | static int falcon_got_lock = 0; |
489 | static DECLARE_WAIT_QUEUE_HEAD(falcon_fairness_wait); |
490 | static int falcon_trying_lock = 0; |
491 | static DECLARE_WAIT_QUEUE_HEAD(falcon_try_wait); |
492 | static int falcon_dont_release = 0; |
493 | |
494 | /* This function releases the lock on the DMA chip if there is no |
495 | * connected command and the disconnected queue is empty. On |
496 | * releasing, instances of falcon_get_lock are awoken, that put |
497 | * themselves to sleep for fairness. They can now try to get the lock |
498 | * again (but others waiting longer more probably will win). |
499 | */ |
500 | |
501 | static void falcon_release_lock_if_possible(struct NCR5380_hostdata *hostdata) |
502 | { |
503 | unsigned long flags; |
504 | |
505 | if (IS_A_TT()) |
506 | return; |
507 | |
508 | local_irq_save(flags); |
509 | |
510 | if (falcon_got_lock && !hostdata->disconnected_queue && |
511 | !hostdata->issue_queue && !hostdata->connected) { |
512 | |
513 | if (falcon_dont_release) { |
514 | #if 0 |
515 | printk("WARNING: Lock release not allowed. Ignored\n"); |
516 | #endif |
517 | local_irq_restore(flags); |
518 | return; |
519 | } |
520 | falcon_got_lock = 0; |
521 | stdma_release(); |
522 | wake_up(&falcon_fairness_wait); |
523 | } |
524 | |
525 | local_irq_restore(flags); |
526 | } |
527 | |
528 | /* This function manages the locking of the ST-DMA. |
529 | * If the DMA isn't locked already for SCSI, it tries to lock it by |
530 | * calling stdma_lock(). But if the DMA is locked by the SCSI code and |
531 | * there are other drivers waiting for the chip, we do not issue the |
532 | * command immediately but wait on 'falcon_fairness_queue'. We will be |
533 | * waked up when the DMA is unlocked by some SCSI interrupt. After that |
534 | * we try to get the lock again. |
535 | * But we must be prepared that more than one instance of |
536 | * falcon_get_lock() is waiting on the fairness queue. They should not |
537 | * try all at once to call stdma_lock(), one is enough! For that, the |
538 | * first one sets 'falcon_trying_lock', others that see that variable |
539 | * set wait on the queue 'falcon_try_wait'. |
540 | * Complicated, complicated.... Sigh... |
541 | */ |
542 | |
543 | static void falcon_get_lock(void) |
544 | { |
545 | unsigned long flags; |
546 | |
547 | if (IS_A_TT()) |
548 | return; |
549 | |
550 | local_irq_save(flags); |
551 | |
552 | while (!in_irq() && falcon_got_lock && stdma_others_waiting()) |
553 | sleep_on(&falcon_fairness_wait); |
554 | |
555 | while (!falcon_got_lock) { |
556 | if (in_irq()) |
557 | panic("Falcon SCSI hasn't ST-DMA lock in interrupt"); |
558 | if (!falcon_trying_lock) { |
559 | falcon_trying_lock = 1; |
560 | stdma_lock(scsi_falcon_intr, NULL); |
561 | falcon_got_lock = 1; |
562 | falcon_trying_lock = 0; |
563 | wake_up(&falcon_try_wait); |
564 | } else { |
565 | sleep_on(&falcon_try_wait); |
566 | } |
567 | } |
568 | |
569 | local_irq_restore(flags); |
570 | if (!falcon_got_lock) |
571 | panic("Falcon SCSI: someone stole the lock :-(\n"); |
572 | } |
573 | |
574 | |
575 | static int __init atari_scsi_detect(struct scsi_host_template *host) |
576 | { |
577 | static int called = 0; |
578 | struct Scsi_Host *instance; |
579 | |
580 | if (!MACH_IS_ATARI || |
581 | (!ATARIHW_PRESENT(ST_SCSI) && !ATARIHW_PRESENT(TT_SCSI)) || |
582 | called) |
583 | return 0; |
584 | |
585 | host->proc_name = "Atari"; |
586 | |
587 | atari_scsi_reg_read = IS_A_TT() ? atari_scsi_tt_reg_read : |
588 | atari_scsi_falcon_reg_read; |
589 | atari_scsi_reg_write = IS_A_TT() ? atari_scsi_tt_reg_write : |
590 | atari_scsi_falcon_reg_write; |
591 | |
592 | /* setup variables */ |
593 | host->can_queue = |
594 | (setup_can_queue > 0) ? setup_can_queue : |
595 | IS_A_TT() ? ATARI_TT_CAN_QUEUE : ATARI_FALCON_CAN_QUEUE; |
596 | host->cmd_per_lun = |
597 | (setup_cmd_per_lun > 0) ? setup_cmd_per_lun : |
598 | IS_A_TT() ? ATARI_TT_CMD_PER_LUN : ATARI_FALCON_CMD_PER_LUN; |
599 | /* Force sg_tablesize to 0 on a Falcon! */ |
600 | host->sg_tablesize = |
601 | !IS_A_TT() ? ATARI_FALCON_SG_TABLESIZE : |
602 | (setup_sg_tablesize >= 0) ? setup_sg_tablesize : ATARI_TT_SG_TABLESIZE; |
603 | |
604 | if (setup_hostid >= 0) |
605 | host->this_id = setup_hostid; |
606 | else { |
607 | /* use 7 as default */ |
608 | host->this_id = 7; |
609 | /* Test if a host id is set in the NVRam */ |
610 | if (ATARIHW_PRESENT(TT_CLK) && nvram_check_checksum()) { |
611 | unsigned char b = nvram_read_byte( 14 ); |
612 | /* Arbitration enabled? (for TOS) If yes, use configured host ID */ |
613 | if (b & 0x80) |
614 | host->this_id = b & 7; |
615 | } |
616 | } |
617 | |
618 | #ifdef SUPPORT_TAGS |
619 | if (setup_use_tagged_queuing < 0) |
620 | setup_use_tagged_queuing = DEFAULT_USE_TAGGED_QUEUING; |
621 | #endif |
622 | #ifdef REAL_DMA |
623 | /* If running on a Falcon and if there's TT-Ram (i.e., more than one |
624 | * memory block, since there's always ST-Ram in a Falcon), then allocate a |
625 | * STRAM_BUFFER_SIZE byte dribble buffer for transfers from/to alternative |
626 | * Ram. |
627 | */ |
628 | if (MACH_IS_ATARI && ATARIHW_PRESENT(ST_SCSI) && |
629 | !ATARIHW_PRESENT(EXTD_DMA) && m68k_num_memory > 1) { |
630 | atari_dma_buffer = atari_stram_alloc(STRAM_BUFFER_SIZE, "SCSI"); |
631 | if (!atari_dma_buffer) { |
632 | printk(KERN_ERR "atari_scsi_detect: can't allocate ST-RAM " |
633 | "double buffer\n"); |
634 | return 0; |
635 | } |
636 | atari_dma_phys_buffer = virt_to_phys(atari_dma_buffer); |
637 | atari_dma_orig_addr = 0; |
638 | } |
639 | #endif |
640 | instance = scsi_register(host, sizeof(struct NCR5380_hostdata)); |
641 | if (instance == NULL) { |
642 | atari_stram_free(atari_dma_buffer); |
643 | atari_dma_buffer = 0; |
644 | return 0; |
645 | } |
646 | atari_scsi_host = instance; |
647 | /* |
648 | * Set irq to 0, to avoid that the mid-level code disables our interrupt |
649 | * during queue_command calls. This is completely unnecessary, and even |
650 | * worse causes bad problems on the Falcon, where the int is shared with |
651 | * IDE and floppy! |
652 | */ |
653 | instance->irq = 0; |
654 | |
655 | #ifdef CONFIG_ATARI_SCSI_RESET_BOOT |
656 | atari_scsi_reset_boot(); |
657 | #endif |
658 | NCR5380_init(instance, 0); |
659 | |
660 | if (IS_A_TT()) { |
661 | |
662 | /* This int is actually "pseudo-slow", i.e. it acts like a slow |
663 | * interrupt after having cleared the pending flag for the DMA |
664 | * interrupt. */ |
665 | if (request_irq(IRQ_TT_MFP_SCSI, scsi_tt_intr, IRQ_TYPE_SLOW, |
666 | "SCSI NCR5380", instance)) { |
667 | printk(KERN_ERR "atari_scsi_detect: cannot allocate irq %d, aborting",IRQ_TT_MFP_SCSI); |
668 | scsi_unregister(atari_scsi_host); |
669 | atari_stram_free(atari_dma_buffer); |
670 | atari_dma_buffer = 0; |
671 | return 0; |
672 | } |
673 | tt_mfp.active_edge |= 0x80; /* SCSI int on L->H */ |
674 | #ifdef REAL_DMA |
675 | tt_scsi_dma.dma_ctrl = 0; |
676 | atari_dma_residual = 0; |
677 | |
678 | if (MACH_IS_MEDUSA) { |
679 | /* While the read overruns (described by Drew Eckhardt in |
680 | * NCR5380.c) never happened on TTs, they do in fact on the Medusa |
681 | * (This was the cause why SCSI didn't work right for so long |
682 | * there.) Since handling the overruns slows down a bit, I turned |
683 | * the #ifdef's into a runtime condition. |
684 | * |
685 | * In principle it should be sufficient to do max. 1 byte with |
686 | * PIO, but there is another problem on the Medusa with the DMA |
687 | * rest data register. So 'atari_read_overruns' is currently set |
688 | * to 4 to avoid having transfers that aren't a multiple of 4. If |
689 | * the rest data bug is fixed, this can be lowered to 1. |
690 | */ |
691 | atari_read_overruns = 4; |
692 | } |
693 | #endif /*REAL_DMA*/ |
694 | } else { /* ! IS_A_TT */ |
695 | |
696 | /* Nothing to do for the interrupt: the ST-DMA is initialized |
697 | * already by atari_init_INTS() |
698 | */ |
699 | |
700 | #ifdef REAL_DMA |
701 | atari_dma_residual = 0; |
702 | atari_dma_active = 0; |
703 | atari_dma_stram_mask = (ATARIHW_PRESENT(EXTD_DMA) ? 0x00000000 |
704 | : 0xff000000); |
705 | #endif |
706 | } |
707 | |
708 | printk(KERN_INFO "scsi%d: options CAN_QUEUE=%d CMD_PER_LUN=%d SCAT-GAT=%d " |
709 | #ifdef SUPPORT_TAGS |
710 | "TAGGED-QUEUING=%s " |
711 | #endif |
712 | "HOSTID=%d", |
713 | instance->host_no, instance->hostt->can_queue, |
714 | instance->hostt->cmd_per_lun, |
715 | instance->hostt->sg_tablesize, |
716 | #ifdef SUPPORT_TAGS |
717 | setup_use_tagged_queuing ? "yes" : "no", |
718 | #endif |
719 | instance->hostt->this_id ); |
720 | NCR5380_print_options(instance); |
721 | printk("\n"); |
722 | |
723 | called = 1; |
724 | return 1; |
725 | } |
726 | |
727 | static int atari_scsi_release(struct Scsi_Host *sh) |
728 | { |
729 | if (IS_A_TT()) |
730 | free_irq(IRQ_TT_MFP_SCSI, sh); |
731 | if (atari_dma_buffer) |
732 | atari_stram_free(atari_dma_buffer); |
733 | NCR5380_exit(sh); |
734 | return 1; |
735 | } |
736 | |
737 | #ifndef MODULE |
738 | static int __init atari_scsi_setup(char *str) |
739 | { |
740 | /* Format of atascsi parameter is: |
741 | * atascsi=<can_queue>,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags> |
742 | * Defaults depend on TT or Falcon, hostid determined at run time. |
743 | * Negative values mean don't change. |
744 | */ |
745 | int ints[6]; |
746 | |
747 | get_options(str, ARRAY_SIZE(ints), ints); |
748 | |
749 | if (ints[0] < 1) { |
750 | printk("atari_scsi_setup: no arguments!\n"); |
751 | return 0; |
752 | } |
753 | |
754 | if (ints[0] >= 1) { |
755 | if (ints[1] > 0) |
756 | /* no limits on this, just > 0 */ |
757 | setup_can_queue = ints[1]; |
758 | } |
759 | if (ints[0] >= 2) { |
760 | if (ints[2] > 0) |
761 | setup_cmd_per_lun = ints[2]; |
762 | } |
763 | if (ints[0] >= 3) { |
764 | if (ints[3] >= 0) { |
765 | setup_sg_tablesize = ints[3]; |
766 | /* Must be <= SG_ALL (255) */ |
767 | if (setup_sg_tablesize > SG_ALL) |
768 | setup_sg_tablesize = SG_ALL; |
769 | } |
770 | } |
771 | if (ints[0] >= 4) { |
772 | /* Must be between 0 and 7 */ |
773 | if (ints[4] >= 0 && ints[4] <= 7) |
774 | setup_hostid = ints[4]; |
775 | else if (ints[4] > 7) |
776 | printk("atari_scsi_setup: invalid host ID %d !\n", ints[4]); |
777 | } |
778 | #ifdef SUPPORT_TAGS |
779 | if (ints[0] >= 5) { |
780 | if (ints[5] >= 0) |
781 | setup_use_tagged_queuing = !!ints[5]; |
782 | } |
783 | #endif |
784 | |
785 | return 1; |
786 | } |
787 | |
788 | __setup("atascsi=", atari_scsi_setup); |
789 | #endif /* !MODULE */ |
790 | |
791 | static int atari_scsi_bus_reset(Scsi_Cmnd *cmd) |
792 | { |
793 | int rv; |
794 | struct NCR5380_hostdata *hostdata = |
795 | (struct NCR5380_hostdata *)cmd->device->host->hostdata; |
796 | |
797 | /* For doing the reset, SCSI interrupts must be disabled first, |
798 | * since the 5380 raises its IRQ line while _RST is active and we |
799 | * can't disable interrupts completely, since we need the timer. |
800 | */ |
801 | /* And abort a maybe active DMA transfer */ |
802 | if (IS_A_TT()) { |
803 | atari_turnoff_irq(IRQ_TT_MFP_SCSI); |
804 | #ifdef REAL_DMA |
805 | tt_scsi_dma.dma_ctrl = 0; |
806 | #endif /* REAL_DMA */ |
807 | } else { |
808 | atari_turnoff_irq(IRQ_MFP_FSCSI); |
809 | #ifdef REAL_DMA |
810 | st_dma.dma_mode_status = 0x90; |
811 | atari_dma_active = 0; |
812 | atari_dma_orig_addr = NULL; |
813 | #endif /* REAL_DMA */ |
814 | } |
815 | |
816 | rv = NCR5380_bus_reset(cmd); |
817 | |
818 | /* Re-enable ints */ |
819 | if (IS_A_TT()) { |
820 | atari_turnon_irq(IRQ_TT_MFP_SCSI); |
821 | } else { |
822 | atari_turnon_irq(IRQ_MFP_FSCSI); |
823 | } |
824 | if ((rv & SCSI_RESET_ACTION) == SCSI_RESET_SUCCESS) |
825 | falcon_release_lock_if_possible(hostdata); |
826 | |
827 | return rv; |
828 | } |
829 | |
830 | |
831 | #ifdef CONFIG_ATARI_SCSI_RESET_BOOT |
832 | static void __init atari_scsi_reset_boot(void) |
833 | { |
834 | unsigned long end; |
835 | |
836 | /* |
837 | * Do a SCSI reset to clean up the bus during initialization. No messing |
838 | * with the queues, interrupts, or locks necessary here. |
839 | */ |
840 | |
841 | printk("Atari SCSI: resetting the SCSI bus..."); |
842 | |
843 | /* get in phase */ |
844 | NCR5380_write(TARGET_COMMAND_REG, |
845 | PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG))); |
846 | |
847 | /* assert RST */ |
848 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST); |
849 | /* The min. reset hold time is 25us, so 40us should be enough */ |
850 | udelay(50); |
851 | /* reset RST and interrupt */ |
852 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
853 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
854 | |
855 | end = jiffies + AFTER_RESET_DELAY; |
856 | while (time_before(jiffies, end)) |
857 | barrier(); |
858 | |
859 | printk(" done\n"); |
860 | } |
861 | #endif |
862 | |
863 | |
864 | static const char *atari_scsi_info(struct Scsi_Host *host) |
865 | { |
866 | /* atari_scsi_detect() is verbose enough... */ |
867 | static const char string[] = "Atari native SCSI"; |
868 | return string; |
869 | } |
870 | |
871 | |
872 | #if defined(REAL_DMA) |
873 | |
874 | static unsigned long atari_scsi_dma_setup(struct Scsi_Host *instance, |
875 | void *data, unsigned long count, |
876 | int dir) |
877 | { |
878 | unsigned long addr = virt_to_phys(data); |
879 | |
880 | DMA_PRINTK("scsi%d: setting up dma, data = %p, phys = %lx, count = %ld, " |
881 | "dir = %d\n", instance->host_no, data, addr, count, dir); |
882 | |
883 | if (!IS_A_TT() && !STRAM_ADDR(addr)) { |
884 | /* If we have a non-DMAable address on a Falcon, use the dribble |
885 | * buffer; 'orig_addr' != 0 in the read case tells the interrupt |
886 | * handler to copy data from the dribble buffer to the originally |
887 | * wanted address. |
888 | */ |
889 | if (dir) |
890 | memcpy(atari_dma_buffer, data, count); |
891 | else |
892 | atari_dma_orig_addr = data; |
893 | addr = atari_dma_phys_buffer; |
894 | } |
895 | |
896 | atari_dma_startaddr = addr; /* Needed for calculating residual later. */ |
897 | |
898 | /* Cache cleanup stuff: On writes, push any dirty cache out before sending |
899 | * it to the peripheral. (Must be done before DMA setup, since at least |
900 | * the ST-DMA begins to fill internal buffers right after setup. For |
901 | * reads, invalidate any cache, may be altered after DMA without CPU |
902 | * knowledge. |
903 | * |
904 | * ++roman: For the Medusa, there's no need at all for that cache stuff, |
905 | * because the hardware does bus snooping (fine!). |
906 | */ |
907 | dma_cache_maintenance(addr, count, dir); |
908 | |
909 | if (count == 0) |
910 | printk(KERN_NOTICE "SCSI warning: DMA programmed for 0 bytes !\n"); |
911 | |
912 | if (IS_A_TT()) { |
913 | tt_scsi_dma.dma_ctrl = dir; |
914 | SCSI_DMA_WRITE_P(dma_addr, addr); |
915 | SCSI_DMA_WRITE_P(dma_cnt, count); |
916 | tt_scsi_dma.dma_ctrl = dir | 2; |
917 | } else { /* ! IS_A_TT */ |
918 | |
919 | /* set address */ |
920 | SCSI_DMA_SETADR(addr); |
921 | |
922 | /* toggle direction bit to clear FIFO and set DMA direction */ |
923 | dir <<= 8; |
924 | st_dma.dma_mode_status = 0x90 | dir; |
925 | st_dma.dma_mode_status = 0x90 | (dir ^ 0x100); |
926 | st_dma.dma_mode_status = 0x90 | dir; |
927 | udelay(40); |
928 | /* On writes, round up the transfer length to the next multiple of 512 |
929 | * (see also comment at atari_dma_xfer_len()). */ |
930 | st_dma.fdc_acces_seccount = (count + (dir ? 511 : 0)) >> 9; |
931 | udelay(40); |
932 | st_dma.dma_mode_status = 0x10 | dir; |
933 | udelay(40); |
934 | /* need not restore value of dir, only boolean value is tested */ |
935 | atari_dma_active = 1; |
936 | } |
937 | |
938 | return count; |
939 | } |
940 | |
941 | |
942 | static long atari_scsi_dma_residual(struct Scsi_Host *instance) |
943 | { |
944 | return atari_dma_residual; |
945 | } |
946 | |
947 | |
948 | #define CMD_SURELY_BLOCK_MODE 0 |
949 | #define CMD_SURELY_BYTE_MODE 1 |
950 | #define CMD_MODE_UNKNOWN 2 |
951 | |
952 | static int falcon_classify_cmd(Scsi_Cmnd *cmd) |
953 | { |
954 | unsigned char opcode = cmd->cmnd[0]; |
955 | |
956 | if (opcode == READ_DEFECT_DATA || opcode == READ_LONG || |
957 | opcode == READ_BUFFER) |
958 | return CMD_SURELY_BYTE_MODE; |
959 | else if (opcode == READ_6 || opcode == READ_10 || |
960 | opcode == 0xa8 /* READ_12 */ || opcode == READ_REVERSE || |
961 | opcode == RECOVER_BUFFERED_DATA) { |
962 | /* In case of a sequential-access target (tape), special care is |
963 | * needed here: The transfer is block-mode only if the 'fixed' bit is |
964 | * set! */ |
965 | if (cmd->device->type == TYPE_TAPE && !(cmd->cmnd[1] & 1)) |
966 | return CMD_SURELY_BYTE_MODE; |
967 | else |
968 | return CMD_SURELY_BLOCK_MODE; |
969 | } else |
970 | return CMD_MODE_UNKNOWN; |
971 | } |
972 | |
973 | |
974 | /* This function calculates the number of bytes that can be transferred via |
975 | * DMA. On the TT, this is arbitrary, but on the Falcon we have to use the |
976 | * ST-DMA chip. There are only multiples of 512 bytes possible and max. |
977 | * 255*512 bytes :-( This means also, that defining READ_OVERRUNS is not |
978 | * possible on the Falcon, since that would require to program the DMA for |
979 | * n*512 - atari_read_overrun bytes. But it seems that the Falcon doesn't have |
980 | * the overrun problem, so this question is academic :-) |
981 | */ |
982 | |
983 | static unsigned long atari_dma_xfer_len(unsigned long wanted_len, |
984 | Scsi_Cmnd *cmd, int write_flag) |
985 | { |
986 | unsigned long possible_len, limit; |
987 | |
988 | if (IS_A_TT()) |
989 | /* TT SCSI DMA can transfer arbitrary #bytes */ |
990 | return wanted_len; |
991 | |
992 | /* ST DMA chip is stupid -- only multiples of 512 bytes! (and max. |
993 | * 255*512 bytes, but this should be enough) |
994 | * |
995 | * ++roman: Aaargl! Another Falcon-SCSI problem... There are some commands |
996 | * that return a number of bytes which cannot be known beforehand. In this |
997 | * case, the given transfer length is an "allocation length". Now it |
998 | * can happen that this allocation length is a multiple of 512 bytes and |
999 | * the DMA is used. But if not n*512 bytes really arrive, some input data |
1000 | * will be lost in the ST-DMA's FIFO :-( Thus, we have to distinguish |
1001 | * between commands that do block transfers and those that do byte |
1002 | * transfers. But this isn't easy... there are lots of vendor specific |
1003 | * commands, and the user can issue any command via the |
1004 | * SCSI_IOCTL_SEND_COMMAND. |
1005 | * |
1006 | * The solution: We classify SCSI commands in 1) surely block-mode cmd.s, |
1007 | * 2) surely byte-mode cmd.s and 3) cmd.s with unknown mode. In case 1) |
1008 | * and 3), the thing to do is obvious: allow any number of blocks via DMA |
1009 | * or none. In case 2), we apply some heuristic: Byte mode is assumed if |
1010 | * the transfer (allocation) length is < 1024, hoping that no cmd. not |
1011 | * explicitly known as byte mode have such big allocation lengths... |
1012 | * BTW, all the discussion above applies only to reads. DMA writes are |
1013 | * unproblematic anyways, since the targets aborts the transfer after |
1014 | * receiving a sufficient number of bytes. |
1015 | * |
1016 | * Another point: If the transfer is from/to an non-ST-RAM address, we |
1017 | * use the dribble buffer and thus can do only STRAM_BUFFER_SIZE bytes. |
1018 | */ |
1019 | |
1020 | if (write_flag) { |
1021 | /* Write operation can always use the DMA, but the transfer size must |
1022 | * be rounded up to the next multiple of 512 (atari_dma_setup() does |
1023 | * this). |
1024 | */ |
1025 | possible_len = wanted_len; |
1026 | } else { |
1027 | /* Read operations: if the wanted transfer length is not a multiple of |
1028 | * 512, we cannot use DMA, since the ST-DMA cannot split transfers |
1029 | * (no interrupt on DMA finished!) |
1030 | */ |
1031 | if (wanted_len & 0x1ff) |
1032 | possible_len = 0; |
1033 | else { |
1034 | /* Now classify the command (see above) and decide whether it is |
1035 | * allowed to do DMA at all */ |
1036 | switch (falcon_classify_cmd(cmd)) { |
1037 | case CMD_SURELY_BLOCK_MODE: |
1038 | possible_len = wanted_len; |
1039 | break; |
1040 | case CMD_SURELY_BYTE_MODE: |
1041 | possible_len = 0; /* DMA prohibited */ |
1042 | break; |
1043 | case CMD_MODE_UNKNOWN: |
1044 | default: |
1045 | /* For unknown commands assume block transfers if the transfer |
1046 | * size/allocation length is >= 1024 */ |
1047 | possible_len = (wanted_len < 1024) ? 0 : wanted_len; |
1048 | break; |
1049 | } |
1050 | } |
1051 | } |
1052 | |
1053 | /* Last step: apply the hard limit on DMA transfers */ |
1054 | limit = (atari_dma_buffer && !STRAM_ADDR(virt_to_phys(cmd->SCp.ptr))) ? |
1055 | STRAM_BUFFER_SIZE : 255*512; |
1056 | if (possible_len > limit) |
1057 | possible_len = limit; |
1058 | |
1059 | if (possible_len != wanted_len) |
1060 | DMA_PRINTK("Sorry, must cut DMA transfer size to %ld bytes " |
1061 | "instead of %ld\n", possible_len, wanted_len); |
1062 | |
1063 | return possible_len; |
1064 | } |
1065 | |
1066 | |
1067 | #endif /* REAL_DMA */ |
1068 | |
1069 | |
1070 | /* NCR5380 register access functions |
1071 | * |
1072 | * There are separate functions for TT and Falcon, because the access |
1073 | * methods are quite different. The calling macros NCR5380_read and |
1074 | * NCR5380_write call these functions via function pointers. |
1075 | */ |
1076 | |
1077 | static unsigned char atari_scsi_tt_reg_read(unsigned char reg) |
1078 | { |
1079 | return tt_scsi_regp[reg * 2]; |
1080 | } |
1081 | |
1082 | static void atari_scsi_tt_reg_write(unsigned char reg, unsigned char value) |
1083 | { |
1084 | tt_scsi_regp[reg * 2] = value; |
1085 | } |
1086 | |
1087 | static unsigned char atari_scsi_falcon_reg_read(unsigned char reg) |
1088 | { |
1089 | dma_wd.dma_mode_status= (u_short)(0x88 + reg); |
1090 | return (u_char)dma_wd.fdc_acces_seccount; |
1091 | } |
1092 | |
1093 | static void atari_scsi_falcon_reg_write(unsigned char reg, unsigned char value) |
1094 | { |
1095 | dma_wd.dma_mode_status = (u_short)(0x88 + reg); |
1096 | dma_wd.fdc_acces_seccount = (u_short)value; |
1097 | } |
1098 | |
1099 | |
1100 | #include "atari_NCR5380.c" |
1101 | |
1102 | static struct scsi_host_template driver_template = { |
1103 | .show_info = atari_scsi_show_info, |
1104 | .name = "Atari native SCSI", |
1105 | .detect = atari_scsi_detect, |
1106 | .release = atari_scsi_release, |
1107 | .info = atari_scsi_info, |
1108 | .queuecommand = atari_scsi_queue_command, |
1109 | .eh_abort_handler = atari_scsi_abort, |
1110 | .eh_bus_reset_handler = atari_scsi_bus_reset, |
1111 | .can_queue = 0, /* initialized at run-time */ |
1112 | .this_id = 0, /* initialized at run-time */ |
1113 | .sg_tablesize = 0, /* initialized at run-time */ |
1114 | .cmd_per_lun = 0, /* initialized at run-time */ |
1115 | .use_clustering = DISABLE_CLUSTERING |
1116 | }; |
1117 | |
1118 | |
1119 | #include "scsi_module.c" |
1120 | |
1121 | MODULE_LICENSE("GPL"); |
1122 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9