Commit | Line | Data |
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1da177e4 LT |
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 | ||
1da177e4 | 67 | #include <linux/module.h> |
1da177e4 | 68 | #include <linux/types.h> |
1da177e4 | 69 | #include <linux/blkdev.h> |
1da177e4 LT |
70 | #include <linux/interrupt.h> |
71 | #include <linux/init.h> | |
72 | #include <linux/nvram.h> | |
73 | #include <linux/bitops.h> | |
eff9cf8d | 74 | #include <linux/wait.h> |
3ff228af | 75 | #include <linux/platform_device.h> |
1da177e4 LT |
76 | |
77 | #include <asm/setup.h> | |
78 | #include <asm/atarihw.h> | |
79 | #include <asm/atariints.h> | |
1da177e4 LT |
80 | #include <asm/atari_stdma.h> |
81 | #include <asm/atari_stram.h> | |
82 | #include <asm/io.h> | |
83 | ||
3ff228af FT |
84 | #include <scsi/scsi_host.h> |
85 | ||
4e705205 FT |
86 | /* Definitions for the core NCR5380 driver. */ |
87 | ||
88 | #define REAL_DMA | |
89 | #define SUPPORT_TAGS | |
90 | #define MAX_TAGS 32 | |
e3f463b0 | 91 | #define DMA_MIN_SIZE 32 |
4e705205 FT |
92 | |
93 | #define NCR5380_implementation_fields /* none */ | |
94 | ||
95 | #define NCR5380_read(reg) atari_scsi_reg_read(reg) | |
96 | #define NCR5380_write(reg, value) atari_scsi_reg_write(reg, value) | |
97 | ||
98 | #define NCR5380_queue_command atari_scsi_queue_command | |
99 | #define NCR5380_abort atari_scsi_abort | |
4e705205 FT |
100 | #define NCR5380_info atari_scsi_info |
101 | ||
102 | #define NCR5380_dma_read_setup(instance, data, count) \ | |
103 | atari_scsi_dma_setup(instance, data, count, 0) | |
104 | #define NCR5380_dma_write_setup(instance, data, count) \ | |
105 | atari_scsi_dma_setup(instance, data, count, 1) | |
106 | #define NCR5380_dma_residual(instance) \ | |
107 | atari_scsi_dma_residual(instance) | |
108 | #define NCR5380_dma_xfer_len(instance, cmd, phase) \ | |
109 | atari_dma_xfer_len(cmd->SCp.this_residual, cmd, !((phase) & SR_IO)) | |
110 | ||
a53a21e4 | 111 | #define NCR5380_acquire_dma_irq(instance) falcon_get_lock(instance) |
e3c3da67 FT |
112 | #define NCR5380_release_dma_irq(instance) falcon_release_lock() |
113 | ||
3ff228af | 114 | #include "NCR5380.h" |
1da177e4 | 115 | |
4e705205 | 116 | |
1da177e4 LT |
117 | #define IS_A_TT() ATARIHW_PRESENT(TT_SCSI) |
118 | ||
119 | #define SCSI_DMA_WRITE_P(elt,val) \ | |
120 | do { \ | |
121 | unsigned long v = val; \ | |
122 | tt_scsi_dma.elt##_lo = v & 0xff; \ | |
123 | v >>= 8; \ | |
124 | tt_scsi_dma.elt##_lmd = v & 0xff; \ | |
125 | v >>= 8; \ | |
126 | tt_scsi_dma.elt##_hmd = v & 0xff; \ | |
127 | v >>= 8; \ | |
128 | tt_scsi_dma.elt##_hi = v & 0xff; \ | |
129 | } while(0) | |
130 | ||
131 | #define SCSI_DMA_READ_P(elt) \ | |
132 | (((((((unsigned long)tt_scsi_dma.elt##_hi << 8) | \ | |
133 | (unsigned long)tt_scsi_dma.elt##_hmd) << 8) | \ | |
134 | (unsigned long)tt_scsi_dma.elt##_lmd) << 8) | \ | |
135 | (unsigned long)tt_scsi_dma.elt##_lo) | |
136 | ||
137 | ||
138 | static inline void SCSI_DMA_SETADR(unsigned long adr) | |
139 | { | |
140 | st_dma.dma_lo = (unsigned char)adr; | |
141 | MFPDELAY(); | |
142 | adr >>= 8; | |
143 | st_dma.dma_md = (unsigned char)adr; | |
144 | MFPDELAY(); | |
145 | adr >>= 8; | |
146 | st_dma.dma_hi = (unsigned char)adr; | |
147 | MFPDELAY(); | |
148 | } | |
149 | ||
150 | static inline unsigned long SCSI_DMA_GETADR(void) | |
151 | { | |
152 | unsigned long adr; | |
153 | adr = st_dma.dma_lo; | |
154 | MFPDELAY(); | |
155 | adr |= (st_dma.dma_md & 0xff) << 8; | |
156 | MFPDELAY(); | |
157 | adr |= (st_dma.dma_hi & 0xff) << 16; | |
158 | MFPDELAY(); | |
159 | return adr; | |
160 | } | |
161 | ||
1da177e4 | 162 | #ifdef REAL_DMA |
c28bda25 | 163 | static void atari_scsi_fetch_restbytes(void); |
1da177e4 | 164 | #endif |
1da177e4 | 165 | |
c28bda25 RZ |
166 | static unsigned char (*atari_scsi_reg_read)(unsigned char reg); |
167 | static void (*atari_scsi_reg_write)(unsigned char reg, unsigned char value); | |
1da177e4 LT |
168 | |
169 | #ifdef REAL_DMA | |
170 | static unsigned long atari_dma_residual, atari_dma_startaddr; | |
171 | static short atari_dma_active; | |
172 | /* pointer to the dribble buffer */ | |
c28bda25 | 173 | static char *atari_dma_buffer; |
1da177e4 LT |
174 | /* precalculated physical address of the dribble buffer */ |
175 | static unsigned long atari_dma_phys_buffer; | |
176 | /* != 0 tells the Falcon int handler to copy data from the dribble buffer */ | |
177 | static char *atari_dma_orig_addr; | |
178 | /* size of the dribble buffer; 4k seems enough, since the Falcon cannot use | |
179 | * scatter-gather anyway, so most transfers are 1024 byte only. In the rare | |
180 | * cases where requests to physical contiguous buffers have been merged, this | |
181 | * request is <= 4k (one page). So I don't think we have to split transfers | |
182 | * just due to this buffer size... | |
183 | */ | |
184 | #define STRAM_BUFFER_SIZE (4096) | |
185 | /* mask for address bits that can't be used with the ST-DMA */ | |
186 | static unsigned long atari_dma_stram_mask; | |
187 | #define STRAM_ADDR(a) (((a) & atari_dma_stram_mask) == 0) | |
1da177e4 LT |
188 | #endif |
189 | ||
190 | static int setup_can_queue = -1; | |
8d3b33f6 | 191 | module_param(setup_can_queue, int, 0); |
1da177e4 | 192 | static int setup_cmd_per_lun = -1; |
8d3b33f6 | 193 | module_param(setup_cmd_per_lun, int, 0); |
1da177e4 | 194 | static int setup_sg_tablesize = -1; |
8d3b33f6 | 195 | module_param(setup_sg_tablesize, int, 0); |
1da177e4 | 196 | static int setup_use_tagged_queuing = -1; |
8d3b33f6 | 197 | module_param(setup_use_tagged_queuing, int, 0); |
1da177e4 | 198 | static int setup_hostid = -1; |
8d3b33f6 | 199 | module_param(setup_hostid, int, 0); |
9c3f0e2b FT |
200 | static int setup_toshiba_delay = -1; |
201 | module_param(setup_toshiba_delay, int, 0); | |
1da177e4 LT |
202 | |
203 | ||
1da177e4 LT |
204 | #if defined(REAL_DMA) |
205 | ||
c28bda25 | 206 | static int scsi_dma_is_ignored_buserr(unsigned char dma_stat) |
1da177e4 LT |
207 | { |
208 | int i; | |
c28bda25 | 209 | unsigned long addr = SCSI_DMA_READ_P(dma_addr), end_addr; |
1da177e4 LT |
210 | |
211 | if (dma_stat & 0x01) { | |
212 | ||
213 | /* A bus error happens when DMA-ing from the last page of a | |
214 | * physical memory chunk (DMA prefetch!), but that doesn't hurt. | |
215 | * Check for this case: | |
216 | */ | |
c28bda25 RZ |
217 | |
218 | for (i = 0; i < m68k_num_memory; ++i) { | |
219 | end_addr = m68k_memory[i].addr + m68k_memory[i].size; | |
1da177e4 | 220 | if (end_addr <= addr && addr <= end_addr + 4) |
c28bda25 | 221 | return 1; |
1da177e4 LT |
222 | } |
223 | } | |
c28bda25 | 224 | return 0; |
1da177e4 LT |
225 | } |
226 | ||
227 | ||
228 | #if 0 | |
229 | /* Dead code... wasn't called anyway :-) and causes some trouble, because at | |
230 | * end-of-DMA, both SCSI ints are triggered simultaneously, so the NCR int has | |
231 | * to clear the DMA int pending bit before it allows other level 6 interrupts. | |
232 | */ | |
c28bda25 | 233 | static void scsi_dma_buserr(int irq, void *dummy) |
1da177e4 | 234 | { |
c28bda25 | 235 | unsigned char dma_stat = tt_scsi_dma.dma_ctrl; |
1da177e4 LT |
236 | |
237 | /* Don't do anything if a NCR interrupt is pending. Probably it's just | |
238 | * masked... */ | |
c28bda25 | 239 | if (atari_irq_pending(IRQ_TT_MFP_SCSI)) |
1da177e4 | 240 | return; |
c28bda25 | 241 | |
1da177e4 LT |
242 | printk("Bad SCSI DMA interrupt! dma_addr=0x%08lx dma_stat=%02x dma_cnt=%08lx\n", |
243 | SCSI_DMA_READ_P(dma_addr), dma_stat, SCSI_DMA_READ_P(dma_cnt)); | |
244 | if (dma_stat & 0x80) { | |
c28bda25 RZ |
245 | if (!scsi_dma_is_ignored_buserr(dma_stat)) |
246 | printk("SCSI DMA bus error -- bad DMA programming!\n"); | |
247 | } else { | |
1da177e4 LT |
248 | /* Under normal circumstances we never should get to this point, |
249 | * since both interrupts are triggered simultaneously and the 5380 | |
250 | * int has higher priority. When this irq is handled, that DMA | |
251 | * interrupt is cleared. So a warning message is printed here. | |
252 | */ | |
c28bda25 | 253 | printk("SCSI DMA intr ?? -- this shouldn't happen!\n"); |
1da177e4 LT |
254 | } |
255 | } | |
256 | #endif | |
257 | ||
258 | #endif | |
259 | ||
260 | ||
cd46140a | 261 | static irqreturn_t scsi_tt_intr(int irq, void *dev) |
1da177e4 LT |
262 | { |
263 | #ifdef REAL_DMA | |
cd46140a FT |
264 | struct Scsi_Host *instance = dev; |
265 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
1da177e4 LT |
266 | int dma_stat; |
267 | ||
268 | dma_stat = tt_scsi_dma.dma_ctrl; | |
269 | ||
cd46140a FT |
270 | dsprintk(NDEBUG_INTR, instance, "NCR5380 interrupt, DMA status = %02x\n", |
271 | dma_stat & 0xff); | |
1da177e4 LT |
272 | |
273 | /* Look if it was the DMA that has interrupted: First possibility | |
274 | * is that a bus error occurred... | |
275 | */ | |
276 | if (dma_stat & 0x80) { | |
c28bda25 | 277 | if (!scsi_dma_is_ignored_buserr(dma_stat)) { |
1da177e4 LT |
278 | printk(KERN_ERR "SCSI DMA caused bus error near 0x%08lx\n", |
279 | SCSI_DMA_READ_P(dma_addr)); | |
280 | printk(KERN_CRIT "SCSI DMA bus error -- bad DMA programming!"); | |
281 | } | |
282 | } | |
283 | ||
284 | /* If the DMA is active but not finished, we have the case | |
285 | * that some other 5380 interrupt occurred within the DMA transfer. | |
286 | * This means we have residual bytes, if the desired end address | |
287 | * is not yet reached. Maybe we have to fetch some bytes from the | |
288 | * rest data register, too. The residual must be calculated from | |
289 | * the address pointer, not the counter register, because only the | |
290 | * addr reg counts bytes not yet written and pending in the rest | |
291 | * data reg! | |
292 | */ | |
293 | if ((dma_stat & 0x02) && !(dma_stat & 0x40)) { | |
cd46140a FT |
294 | atari_dma_residual = hostdata->dma_len - |
295 | (SCSI_DMA_READ_P(dma_addr) - atari_dma_startaddr); | |
1da177e4 | 296 | |
d65e634a | 297 | dprintk(NDEBUG_DMA, "SCSI DMA: There are %ld residual bytes.\n", |
1da177e4 LT |
298 | atari_dma_residual); |
299 | ||
300 | if ((signed int)atari_dma_residual < 0) | |
301 | atari_dma_residual = 0; | |
302 | if ((dma_stat & 1) == 0) { | |
c28bda25 RZ |
303 | /* |
304 | * After read operations, we maybe have to | |
305 | * transport some rest bytes | |
306 | */ | |
1da177e4 | 307 | atari_scsi_fetch_restbytes(); |
c28bda25 RZ |
308 | } else { |
309 | /* | |
310 | * There seems to be a nasty bug in some SCSI-DMA/NCR | |
311 | * combinations: If a target disconnects while a write | |
312 | * operation is going on, the address register of the | |
313 | * DMA may be a few bytes farer than it actually read. | |
314 | * This is probably due to DMA prefetching and a delay | |
315 | * between DMA and NCR. Experiments showed that the | |
316 | * dma_addr is 9 bytes to high, but this could vary. | |
317 | * The problem is, that the residual is thus calculated | |
318 | * wrong and the next transfer will start behind where | |
319 | * it should. So we round up the residual to the next | |
320 | * multiple of a sector size, if it isn't already a | |
321 | * multiple and the originally expected transfer size | |
322 | * was. The latter condition is there to ensure that | |
323 | * the correction is taken only for "real" data | |
324 | * transfers and not for, e.g., the parameters of some | |
325 | * other command. These shouldn't disconnect anyway. | |
326 | */ | |
1da177e4 | 327 | if (atari_dma_residual & 0x1ff) { |
d65e634a | 328 | dprintk(NDEBUG_DMA, "SCSI DMA: DMA bug corrected, " |
1da177e4 LT |
329 | "difference %ld bytes\n", |
330 | 512 - (atari_dma_residual & 0x1ff)); | |
331 | atari_dma_residual = (atari_dma_residual + 511) & ~0x1ff; | |
332 | } | |
333 | } | |
334 | tt_scsi_dma.dma_ctrl = 0; | |
335 | } | |
336 | ||
337 | /* If the DMA is finished, fetch the rest bytes and turn it off */ | |
338 | if (dma_stat & 0x40) { | |
339 | atari_dma_residual = 0; | |
340 | if ((dma_stat & 1) == 0) | |
341 | atari_scsi_fetch_restbytes(); | |
342 | tt_scsi_dma.dma_ctrl = 0; | |
343 | } | |
344 | ||
345 | #endif /* REAL_DMA */ | |
c28bda25 | 346 | |
cd46140a | 347 | NCR5380_intr(irq, dev); |
1da177e4 | 348 | |
1da177e4 LT |
349 | return IRQ_HANDLED; |
350 | } | |
351 | ||
352 | ||
cd46140a | 353 | static irqreturn_t scsi_falcon_intr(int irq, void *dev) |
1da177e4 LT |
354 | { |
355 | #ifdef REAL_DMA | |
cd46140a FT |
356 | struct Scsi_Host *instance = dev; |
357 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
1da177e4 LT |
358 | int dma_stat; |
359 | ||
360 | /* Turn off DMA and select sector counter register before | |
361 | * accessing the status register (Atari recommendation!) | |
362 | */ | |
363 | st_dma.dma_mode_status = 0x90; | |
364 | dma_stat = st_dma.dma_mode_status; | |
365 | ||
366 | /* Bit 0 indicates some error in the DMA process... don't know | |
367 | * what happened exactly (no further docu). | |
368 | */ | |
369 | if (!(dma_stat & 0x01)) { | |
370 | /* DMA error */ | |
371 | printk(KERN_CRIT "SCSI DMA error near 0x%08lx!\n", SCSI_DMA_GETADR()); | |
372 | } | |
373 | ||
374 | /* If the DMA was active, but now bit 1 is not clear, it is some | |
375 | * other 5380 interrupt that finishes the DMA transfer. We have to | |
376 | * calculate the number of residual bytes and give a warning if | |
377 | * bytes are stuck in the ST-DMA fifo (there's no way to reach them!) | |
378 | */ | |
379 | if (atari_dma_active && (dma_stat & 0x02)) { | |
c28bda25 | 380 | unsigned long transferred; |
1da177e4 LT |
381 | |
382 | transferred = SCSI_DMA_GETADR() - atari_dma_startaddr; | |
383 | /* The ST-DMA address is incremented in 2-byte steps, but the | |
384 | * data are written only in 16-byte chunks. If the number of | |
385 | * transferred bytes is not divisible by 16, the remainder is | |
386 | * lost somewhere in outer space. | |
387 | */ | |
388 | if (transferred & 15) | |
389 | printk(KERN_ERR "SCSI DMA error: %ld bytes lost in " | |
390 | "ST-DMA fifo\n", transferred & 15); | |
391 | ||
cd46140a | 392 | atari_dma_residual = hostdata->dma_len - transferred; |
d65e634a | 393 | dprintk(NDEBUG_DMA, "SCSI DMA: There are %ld residual bytes.\n", |
1da177e4 | 394 | atari_dma_residual); |
c28bda25 | 395 | } else |
1da177e4 LT |
396 | atari_dma_residual = 0; |
397 | atari_dma_active = 0; | |
398 | ||
399 | if (atari_dma_orig_addr) { | |
400 | /* If the dribble buffer was used on a read operation, copy the DMA-ed | |
401 | * data to the original destination address. | |
402 | */ | |
403 | memcpy(atari_dma_orig_addr, phys_to_virt(atari_dma_startaddr), | |
cd46140a | 404 | hostdata->dma_len - atari_dma_residual); |
1da177e4 LT |
405 | atari_dma_orig_addr = NULL; |
406 | } | |
407 | ||
408 | #endif /* REAL_DMA */ | |
409 | ||
cd46140a FT |
410 | NCR5380_intr(irq, dev); |
411 | ||
1da177e4 LT |
412 | return IRQ_HANDLED; |
413 | } | |
414 | ||
415 | ||
416 | #ifdef REAL_DMA | |
c28bda25 | 417 | static void atari_scsi_fetch_restbytes(void) |
1da177e4 LT |
418 | { |
419 | int nr; | |
420 | char *src, *dst; | |
421 | unsigned long phys_dst; | |
422 | ||
423 | /* fetch rest bytes in the DMA register */ | |
424 | phys_dst = SCSI_DMA_READ_P(dma_addr); | |
425 | nr = phys_dst & 3; | |
426 | if (nr) { | |
427 | /* there are 'nr' bytes left for the last long address | |
428 | before the DMA pointer */ | |
429 | phys_dst ^= nr; | |
d65e634a | 430 | dprintk(NDEBUG_DMA, "SCSI DMA: there are %d rest bytes for phys addr 0x%08lx", |
1da177e4 LT |
431 | nr, phys_dst); |
432 | /* The content of the DMA pointer is a physical address! */ | |
433 | dst = phys_to_virt(phys_dst); | |
d65e634a | 434 | dprintk(NDEBUG_DMA, " = virt addr %p\n", dst); |
1da177e4 LT |
435 | for (src = (char *)&tt_scsi_dma.dma_restdata; nr != 0; --nr) |
436 | *dst++ = *src++; | |
437 | } | |
438 | } | |
439 | #endif /* REAL_DMA */ | |
440 | ||
441 | ||
1da177e4 | 442 | /* This function releases the lock on the DMA chip if there is no |
16b29e75 | 443 | * connected command and the disconnected queue is empty. |
1da177e4 LT |
444 | */ |
445 | ||
e3c3da67 | 446 | static void falcon_release_lock(void) |
1da177e4 | 447 | { |
c28bda25 RZ |
448 | if (IS_A_TT()) |
449 | return; | |
450 | ||
e3c3da67 | 451 | if (stdma_is_locked_by(scsi_falcon_intr)) |
1da177e4 | 452 | stdma_release(); |
1da177e4 LT |
453 | } |
454 | ||
455 | /* This function manages the locking of the ST-DMA. | |
456 | * If the DMA isn't locked already for SCSI, it tries to lock it by | |
457 | * calling stdma_lock(). But if the DMA is locked by the SCSI code and | |
458 | * there are other drivers waiting for the chip, we do not issue the | |
16b29e75 | 459 | * command immediately but tell the SCSI mid-layer to defer. |
1da177e4 LT |
460 | */ |
461 | ||
a53a21e4 | 462 | static int falcon_get_lock(struct Scsi_Host *instance) |
1da177e4 | 463 | { |
c28bda25 | 464 | if (IS_A_TT()) |
16b29e75 | 465 | return 1; |
1da177e4 | 466 | |
16b29e75 | 467 | if (in_interrupt()) |
a53a21e4 | 468 | return stdma_try_lock(scsi_falcon_intr, instance); |
1da177e4 | 469 | |
a53a21e4 | 470 | stdma_lock(scsi_falcon_intr, instance); |
16b29e75 | 471 | return 1; |
1da177e4 LT |
472 | } |
473 | ||
7b54e43a GU |
474 | #ifndef MODULE |
475 | static int __init atari_scsi_setup(char *str) | |
1da177e4 LT |
476 | { |
477 | /* Format of atascsi parameter is: | |
478 | * atascsi=<can_queue>,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags> | |
3ff228af | 479 | * Defaults depend on TT or Falcon, determined at run time. |
1da177e4 LT |
480 | * Negative values mean don't change. |
481 | */ | |
9c3f0e2b | 482 | int ints[8]; |
7b54e43a GU |
483 | |
484 | get_options(str, ARRAY_SIZE(ints), ints); | |
c28bda25 | 485 | |
1da177e4 | 486 | if (ints[0] < 1) { |
c28bda25 | 487 | printk("atari_scsi_setup: no arguments!\n"); |
7b54e43a | 488 | return 0; |
1da177e4 | 489 | } |
3ff228af FT |
490 | if (ints[0] >= 1) |
491 | setup_can_queue = ints[1]; | |
492 | if (ints[0] >= 2) | |
493 | setup_cmd_per_lun = ints[2]; | |
494 | if (ints[0] >= 3) | |
495 | setup_sg_tablesize = ints[3]; | |
496 | if (ints[0] >= 4) | |
497 | setup_hostid = ints[4]; | |
3ff228af FT |
498 | if (ints[0] >= 5) |
499 | setup_use_tagged_queuing = ints[5]; | |
9c3f0e2b FT |
500 | /* ints[6] (use_pdma) is ignored */ |
501 | if (ints[0] >= 7) | |
502 | setup_toshiba_delay = ints[7]; | |
7b54e43a GU |
503 | |
504 | return 1; | |
1da177e4 LT |
505 | } |
506 | ||
7b54e43a GU |
507 | __setup("atascsi=", atari_scsi_setup); |
508 | #endif /* !MODULE */ | |
509 | ||
c28bda25 | 510 | |
1da177e4 LT |
511 | #if defined(REAL_DMA) |
512 | ||
107b5d53 GU |
513 | static unsigned long atari_scsi_dma_setup(struct Scsi_Host *instance, |
514 | void *data, unsigned long count, | |
515 | int dir) | |
1da177e4 | 516 | { |
c28bda25 | 517 | unsigned long addr = virt_to_phys(data); |
1da177e4 | 518 | |
d65e634a | 519 | dprintk(NDEBUG_DMA, "scsi%d: setting up dma, data = %p, phys = %lx, count = %ld, " |
1da177e4 LT |
520 | "dir = %d\n", instance->host_no, data, addr, count, dir); |
521 | ||
522 | if (!IS_A_TT() && !STRAM_ADDR(addr)) { | |
523 | /* If we have a non-DMAable address on a Falcon, use the dribble | |
524 | * buffer; 'orig_addr' != 0 in the read case tells the interrupt | |
525 | * handler to copy data from the dribble buffer to the originally | |
526 | * wanted address. | |
527 | */ | |
528 | if (dir) | |
c28bda25 | 529 | memcpy(atari_dma_buffer, data, count); |
1da177e4 LT |
530 | else |
531 | atari_dma_orig_addr = data; | |
532 | addr = atari_dma_phys_buffer; | |
533 | } | |
c28bda25 | 534 | |
1da177e4 | 535 | atari_dma_startaddr = addr; /* Needed for calculating residual later. */ |
c28bda25 | 536 | |
1da177e4 LT |
537 | /* Cache cleanup stuff: On writes, push any dirty cache out before sending |
538 | * it to the peripheral. (Must be done before DMA setup, since at least | |
539 | * the ST-DMA begins to fill internal buffers right after setup. For | |
540 | * reads, invalidate any cache, may be altered after DMA without CPU | |
541 | * knowledge. | |
c28bda25 | 542 | * |
1da177e4 LT |
543 | * ++roman: For the Medusa, there's no need at all for that cache stuff, |
544 | * because the hardware does bus snooping (fine!). | |
545 | */ | |
c28bda25 | 546 | dma_cache_maintenance(addr, count, dir); |
1da177e4 LT |
547 | |
548 | if (count == 0) | |
549 | printk(KERN_NOTICE "SCSI warning: DMA programmed for 0 bytes !\n"); | |
550 | ||
551 | if (IS_A_TT()) { | |
552 | tt_scsi_dma.dma_ctrl = dir; | |
c28bda25 RZ |
553 | SCSI_DMA_WRITE_P(dma_addr, addr); |
554 | SCSI_DMA_WRITE_P(dma_cnt, count); | |
1da177e4 | 555 | tt_scsi_dma.dma_ctrl = dir | 2; |
c28bda25 RZ |
556 | } else { /* ! IS_A_TT */ |
557 | ||
1da177e4 | 558 | /* set address */ |
c28bda25 | 559 | SCSI_DMA_SETADR(addr); |
1da177e4 LT |
560 | |
561 | /* toggle direction bit to clear FIFO and set DMA direction */ | |
562 | dir <<= 8; | |
563 | st_dma.dma_mode_status = 0x90 | dir; | |
564 | st_dma.dma_mode_status = 0x90 | (dir ^ 0x100); | |
565 | st_dma.dma_mode_status = 0x90 | dir; | |
566 | udelay(40); | |
567 | /* On writes, round up the transfer length to the next multiple of 512 | |
568 | * (see also comment at atari_dma_xfer_len()). */ | |
569 | st_dma.fdc_acces_seccount = (count + (dir ? 511 : 0)) >> 9; | |
570 | udelay(40); | |
571 | st_dma.dma_mode_status = 0x10 | dir; | |
572 | udelay(40); | |
573 | /* need not restore value of dir, only boolean value is tested */ | |
574 | atari_dma_active = 1; | |
575 | } | |
576 | ||
c28bda25 | 577 | return count; |
1da177e4 LT |
578 | } |
579 | ||
580 | ||
c28bda25 | 581 | static long atari_scsi_dma_residual(struct Scsi_Host *instance) |
1da177e4 | 582 | { |
c28bda25 | 583 | return atari_dma_residual; |
1da177e4 LT |
584 | } |
585 | ||
586 | ||
587 | #define CMD_SURELY_BLOCK_MODE 0 | |
588 | #define CMD_SURELY_BYTE_MODE 1 | |
589 | #define CMD_MODE_UNKNOWN 2 | |
590 | ||
710ddd0d | 591 | static int falcon_classify_cmd(struct scsi_cmnd *cmd) |
1da177e4 LT |
592 | { |
593 | unsigned char opcode = cmd->cmnd[0]; | |
c28bda25 | 594 | |
1da177e4 | 595 | if (opcode == READ_DEFECT_DATA || opcode == READ_LONG || |
c28bda25 RZ |
596 | opcode == READ_BUFFER) |
597 | return CMD_SURELY_BYTE_MODE; | |
1da177e4 LT |
598 | else if (opcode == READ_6 || opcode == READ_10 || |
599 | opcode == 0xa8 /* READ_12 */ || opcode == READ_REVERSE || | |
600 | opcode == RECOVER_BUFFERED_DATA) { | |
601 | /* In case of a sequential-access target (tape), special care is | |
602 | * needed here: The transfer is block-mode only if the 'fixed' bit is | |
603 | * set! */ | |
604 | if (cmd->device->type == TYPE_TAPE && !(cmd->cmnd[1] & 1)) | |
c28bda25 | 605 | return CMD_SURELY_BYTE_MODE; |
1da177e4 | 606 | else |
c28bda25 RZ |
607 | return CMD_SURELY_BLOCK_MODE; |
608 | } else | |
609 | return CMD_MODE_UNKNOWN; | |
1da177e4 LT |
610 | } |
611 | ||
612 | ||
613 | /* This function calculates the number of bytes that can be transferred via | |
614 | * DMA. On the TT, this is arbitrary, but on the Falcon we have to use the | |
615 | * ST-DMA chip. There are only multiples of 512 bytes possible and max. | |
616 | * 255*512 bytes :-( This means also, that defining READ_OVERRUNS is not | |
617 | * possible on the Falcon, since that would require to program the DMA for | |
618 | * n*512 - atari_read_overrun bytes. But it seems that the Falcon doesn't have | |
619 | * the overrun problem, so this question is academic :-) | |
620 | */ | |
621 | ||
c28bda25 | 622 | static unsigned long atari_dma_xfer_len(unsigned long wanted_len, |
710ddd0d | 623 | struct scsi_cmnd *cmd, int write_flag) |
1da177e4 LT |
624 | { |
625 | unsigned long possible_len, limit; | |
29c8a246 | 626 | |
1da177e4 LT |
627 | if (IS_A_TT()) |
628 | /* TT SCSI DMA can transfer arbitrary #bytes */ | |
c28bda25 | 629 | return wanted_len; |
1da177e4 LT |
630 | |
631 | /* ST DMA chip is stupid -- only multiples of 512 bytes! (and max. | |
632 | * 255*512 bytes, but this should be enough) | |
633 | * | |
634 | * ++roman: Aaargl! Another Falcon-SCSI problem... There are some commands | |
635 | * that return a number of bytes which cannot be known beforehand. In this | |
636 | * case, the given transfer length is an "allocation length". Now it | |
637 | * can happen that this allocation length is a multiple of 512 bytes and | |
638 | * the DMA is used. But if not n*512 bytes really arrive, some input data | |
639 | * will be lost in the ST-DMA's FIFO :-( Thus, we have to distinguish | |
640 | * between commands that do block transfers and those that do byte | |
641 | * transfers. But this isn't easy... there are lots of vendor specific | |
642 | * commands, and the user can issue any command via the | |
643 | * SCSI_IOCTL_SEND_COMMAND. | |
644 | * | |
645 | * The solution: We classify SCSI commands in 1) surely block-mode cmd.s, | |
646 | * 2) surely byte-mode cmd.s and 3) cmd.s with unknown mode. In case 1) | |
647 | * and 3), the thing to do is obvious: allow any number of blocks via DMA | |
648 | * or none. In case 2), we apply some heuristic: Byte mode is assumed if | |
649 | * the transfer (allocation) length is < 1024, hoping that no cmd. not | |
650 | * explicitly known as byte mode have such big allocation lengths... | |
651 | * BTW, all the discussion above applies only to reads. DMA writes are | |
652 | * unproblematic anyways, since the targets aborts the transfer after | |
653 | * receiving a sufficient number of bytes. | |
654 | * | |
655 | * Another point: If the transfer is from/to an non-ST-RAM address, we | |
656 | * use the dribble buffer and thus can do only STRAM_BUFFER_SIZE bytes. | |
657 | */ | |
658 | ||
659 | if (write_flag) { | |
660 | /* Write operation can always use the DMA, but the transfer size must | |
661 | * be rounded up to the next multiple of 512 (atari_dma_setup() does | |
662 | * this). | |
663 | */ | |
664 | possible_len = wanted_len; | |
c28bda25 | 665 | } else { |
1da177e4 LT |
666 | /* Read operations: if the wanted transfer length is not a multiple of |
667 | * 512, we cannot use DMA, since the ST-DMA cannot split transfers | |
668 | * (no interrupt on DMA finished!) | |
669 | */ | |
670 | if (wanted_len & 0x1ff) | |
671 | possible_len = 0; | |
672 | else { | |
673 | /* Now classify the command (see above) and decide whether it is | |
674 | * allowed to do DMA at all */ | |
c28bda25 RZ |
675 | switch (falcon_classify_cmd(cmd)) { |
676 | case CMD_SURELY_BLOCK_MODE: | |
1da177e4 LT |
677 | possible_len = wanted_len; |
678 | break; | |
c28bda25 | 679 | case CMD_SURELY_BYTE_MODE: |
1da177e4 LT |
680 | possible_len = 0; /* DMA prohibited */ |
681 | break; | |
c28bda25 RZ |
682 | case CMD_MODE_UNKNOWN: |
683 | default: | |
1da177e4 LT |
684 | /* For unknown commands assume block transfers if the transfer |
685 | * size/allocation length is >= 1024 */ | |
686 | possible_len = (wanted_len < 1024) ? 0 : wanted_len; | |
687 | break; | |
688 | } | |
689 | } | |
690 | } | |
c28bda25 | 691 | |
1da177e4 | 692 | /* Last step: apply the hard limit on DMA transfers */ |
c28bda25 | 693 | limit = (atari_dma_buffer && !STRAM_ADDR(virt_to_phys(cmd->SCp.ptr))) ? |
1da177e4 LT |
694 | STRAM_BUFFER_SIZE : 255*512; |
695 | if (possible_len > limit) | |
696 | possible_len = limit; | |
697 | ||
698 | if (possible_len != wanted_len) | |
d65e634a | 699 | dprintk(NDEBUG_DMA, "Sorry, must cut DMA transfer size to %ld bytes " |
1da177e4 LT |
700 | "instead of %ld\n", possible_len, wanted_len); |
701 | ||
c28bda25 | 702 | return possible_len; |
1da177e4 LT |
703 | } |
704 | ||
705 | ||
706 | #endif /* REAL_DMA */ | |
707 | ||
708 | ||
709 | /* NCR5380 register access functions | |
710 | * | |
711 | * There are separate functions for TT and Falcon, because the access | |
712 | * methods are quite different. The calling macros NCR5380_read and | |
713 | * NCR5380_write call these functions via function pointers. | |
714 | */ | |
715 | ||
c28bda25 | 716 | static unsigned char atari_scsi_tt_reg_read(unsigned char reg) |
1da177e4 | 717 | { |
c28bda25 | 718 | return tt_scsi_regp[reg * 2]; |
1da177e4 LT |
719 | } |
720 | ||
c28bda25 | 721 | static void atari_scsi_tt_reg_write(unsigned char reg, unsigned char value) |
1da177e4 LT |
722 | { |
723 | tt_scsi_regp[reg * 2] = value; | |
724 | } | |
725 | ||
c28bda25 | 726 | static unsigned char atari_scsi_falcon_reg_read(unsigned char reg) |
1da177e4 LT |
727 | { |
728 | dma_wd.dma_mode_status= (u_short)(0x88 + reg); | |
c28bda25 | 729 | return (u_char)dma_wd.fdc_acces_seccount; |
1da177e4 LT |
730 | } |
731 | ||
c28bda25 | 732 | static void atari_scsi_falcon_reg_write(unsigned char reg, unsigned char value) |
1da177e4 LT |
733 | { |
734 | dma_wd.dma_mode_status = (u_short)(0x88 + reg); | |
735 | dma_wd.fdc_acces_seccount = (u_short)value; | |
736 | } | |
737 | ||
738 | ||
739 | #include "atari_NCR5380.c" | |
740 | ||
4d3d2a54 FT |
741 | static int atari_scsi_bus_reset(struct scsi_cmnd *cmd) |
742 | { | |
743 | int rv; | |
e3c3da67 FT |
744 | unsigned long flags; |
745 | ||
746 | local_irq_save(flags); | |
4d3d2a54 | 747 | |
4d3d2a54 | 748 | #ifdef REAL_DMA |
e3c3da67 FT |
749 | /* Abort a maybe active DMA transfer */ |
750 | if (IS_A_TT()) { | |
4d3d2a54 | 751 | tt_scsi_dma.dma_ctrl = 0; |
4d3d2a54 | 752 | } else { |
4d3d2a54 FT |
753 | st_dma.dma_mode_status = 0x90; |
754 | atari_dma_active = 0; | |
755 | atari_dma_orig_addr = NULL; | |
4d3d2a54 | 756 | } |
e3c3da67 | 757 | #endif |
4d3d2a54 FT |
758 | |
759 | rv = NCR5380_bus_reset(cmd); | |
760 | ||
e3c3da67 FT |
761 | /* The 5380 raises its IRQ line while _RST is active but the ST DMA |
762 | * "lock" has been released so this interrupt may end up handled by | |
763 | * floppy or IDE driver (if one of them holds the lock). The NCR5380 | |
764 | * interrupt flag has been cleared already. | |
765 | */ | |
4d3d2a54 | 766 | |
e3c3da67 | 767 | local_irq_restore(flags); |
4d3d2a54 FT |
768 | |
769 | return rv; | |
770 | } | |
771 | ||
3ff228af FT |
772 | #define DRV_MODULE_NAME "atari_scsi" |
773 | #define PFX DRV_MODULE_NAME ": " | |
774 | ||
775 | static struct scsi_host_template atari_scsi_template = { | |
776 | .module = THIS_MODULE, | |
777 | .proc_name = DRV_MODULE_NAME, | |
1da177e4 | 778 | .name = "Atari native SCSI", |
1da177e4 LT |
779 | .info = atari_scsi_info, |
780 | .queuecommand = atari_scsi_queue_command, | |
781 | .eh_abort_handler = atari_scsi_abort, | |
782 | .eh_bus_reset_handler = atari_scsi_bus_reset, | |
3ff228af | 783 | .this_id = 7, |
aa2e2cb1 | 784 | .use_clustering = DISABLE_CLUSTERING, |
32b26a10 | 785 | .cmd_size = NCR5380_CMD_SIZE, |
1da177e4 LT |
786 | }; |
787 | ||
3ff228af FT |
788 | static int __init atari_scsi_probe(struct platform_device *pdev) |
789 | { | |
790 | struct Scsi_Host *instance; | |
791 | int error; | |
792 | struct resource *irq; | |
ef1081cb | 793 | int host_flags = 0; |
3ff228af FT |
794 | |
795 | irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0); | |
796 | if (!irq) | |
797 | return -ENODEV; | |
798 | ||
799 | if (ATARIHW_PRESENT(TT_SCSI)) { | |
800 | atari_scsi_reg_read = atari_scsi_tt_reg_read; | |
801 | atari_scsi_reg_write = atari_scsi_tt_reg_write; | |
802 | } else { | |
803 | atari_scsi_reg_read = atari_scsi_falcon_reg_read; | |
804 | atari_scsi_reg_write = atari_scsi_falcon_reg_write; | |
805 | } | |
806 | ||
807 | /* The values for CMD_PER_LUN and CAN_QUEUE are somehow arbitrary. | |
808 | * Higher values should work, too; try it! | |
809 | * (But cmd_per_lun costs memory!) | |
810 | * | |
811 | * But there seems to be a bug somewhere that requires CAN_QUEUE to be | |
812 | * 2*CMD_PER_LUN. At least on a TT, no spurious timeouts seen since | |
813 | * changed CMD_PER_LUN... | |
814 | * | |
815 | * Note: The Falcon currently uses 8/1 setting due to unsolved problems | |
816 | * with cmd_per_lun != 1 | |
817 | */ | |
818 | if (ATARIHW_PRESENT(TT_SCSI)) { | |
819 | atari_scsi_template.can_queue = 16; | |
820 | atari_scsi_template.cmd_per_lun = 8; | |
821 | atari_scsi_template.sg_tablesize = SG_ALL; | |
822 | } else { | |
823 | atari_scsi_template.can_queue = 8; | |
824 | atari_scsi_template.cmd_per_lun = 1; | |
825 | atari_scsi_template.sg_tablesize = SG_NONE; | |
826 | } | |
827 | ||
828 | if (setup_can_queue > 0) | |
829 | atari_scsi_template.can_queue = setup_can_queue; | |
830 | ||
831 | if (setup_cmd_per_lun > 0) | |
832 | atari_scsi_template.cmd_per_lun = setup_cmd_per_lun; | |
833 | ||
834 | /* Leave sg_tablesize at 0 on a Falcon! */ | |
835 | if (ATARIHW_PRESENT(TT_SCSI) && setup_sg_tablesize >= 0) | |
836 | atari_scsi_template.sg_tablesize = setup_sg_tablesize; | |
837 | ||
838 | if (setup_hostid >= 0) { | |
839 | atari_scsi_template.this_id = setup_hostid & 7; | |
840 | } else { | |
841 | /* Test if a host id is set in the NVRam */ | |
842 | if (ATARIHW_PRESENT(TT_CLK) && nvram_check_checksum()) { | |
6225a16a | 843 | unsigned char b = nvram_read_byte(16); |
3ff228af FT |
844 | |
845 | /* Arbitration enabled? (for TOS) | |
846 | * If yes, use configured host ID | |
847 | */ | |
848 | if (b & 0x80) | |
849 | atari_scsi_template.this_id = b & 7; | |
850 | } | |
851 | } | |
852 | ||
3ff228af FT |
853 | |
854 | #ifdef REAL_DMA | |
855 | /* If running on a Falcon and if there's TT-Ram (i.e., more than one | |
856 | * memory block, since there's always ST-Ram in a Falcon), then | |
857 | * allocate a STRAM_BUFFER_SIZE byte dribble buffer for transfers | |
858 | * from/to alternative Ram. | |
859 | */ | |
860 | if (ATARIHW_PRESENT(ST_SCSI) && !ATARIHW_PRESENT(EXTD_DMA) && | |
861 | m68k_num_memory > 1) { | |
862 | atari_dma_buffer = atari_stram_alloc(STRAM_BUFFER_SIZE, "SCSI"); | |
863 | if (!atari_dma_buffer) { | |
864 | pr_err(PFX "can't allocate ST-RAM double buffer\n"); | |
865 | return -ENOMEM; | |
866 | } | |
867 | atari_dma_phys_buffer = atari_stram_to_phys(atari_dma_buffer); | |
868 | atari_dma_orig_addr = 0; | |
869 | } | |
870 | #endif | |
871 | ||
872 | instance = scsi_host_alloc(&atari_scsi_template, | |
873 | sizeof(struct NCR5380_hostdata)); | |
874 | if (!instance) { | |
875 | error = -ENOMEM; | |
876 | goto fail_alloc; | |
877 | } | |
3ff228af | 878 | |
3ff228af FT |
879 | instance->irq = irq->start; |
880 | ||
ef1081cb | 881 | host_flags |= IS_A_TT() ? 0 : FLAG_LATE_DMA_SETUP; |
ca513fc9 FT |
882 | #ifdef SUPPORT_TAGS |
883 | host_flags |= setup_use_tagged_queuing > 0 ? FLAG_TAGGED_QUEUING : 0; | |
884 | #endif | |
9c3f0e2b | 885 | host_flags |= setup_toshiba_delay > 0 ? FLAG_TOSHIBA_DELAY : 0; |
ca513fc9 | 886 | |
0ad0eff9 FT |
887 | error = NCR5380_init(instance, host_flags); |
888 | if (error) | |
889 | goto fail_init; | |
3ff228af FT |
890 | |
891 | if (IS_A_TT()) { | |
892 | error = request_irq(instance->irq, scsi_tt_intr, 0, | |
893 | "NCR5380", instance); | |
894 | if (error) { | |
895 | pr_err(PFX "request irq %d failed, aborting\n", | |
896 | instance->irq); | |
897 | goto fail_irq; | |
898 | } | |
899 | tt_mfp.active_edge |= 0x80; /* SCSI int on L->H */ | |
900 | #ifdef REAL_DMA | |
901 | tt_scsi_dma.dma_ctrl = 0; | |
902 | atari_dma_residual = 0; | |
903 | ||
904 | /* While the read overruns (described by Drew Eckhardt in | |
905 | * NCR5380.c) never happened on TTs, they do in fact on the | |
906 | * Medusa (This was the cause why SCSI didn't work right for | |
907 | * so long there.) Since handling the overruns slows down | |
908 | * a bit, I turned the #ifdef's into a runtime condition. | |
909 | * | |
910 | * In principle it should be sufficient to do max. 1 byte with | |
911 | * PIO, but there is another problem on the Medusa with the DMA | |
ef1081cb | 912 | * rest data register. So read_overruns is currently set |
3ff228af FT |
913 | * to 4 to avoid having transfers that aren't a multiple of 4. |
914 | * If the rest data bug is fixed, this can be lowered to 1. | |
915 | */ | |
ef1081cb FT |
916 | if (MACH_IS_MEDUSA) { |
917 | struct NCR5380_hostdata *hostdata = | |
918 | shost_priv(instance); | |
919 | ||
920 | hostdata->read_overruns = 4; | |
921 | } | |
3ff228af FT |
922 | #endif |
923 | } else { | |
924 | /* Nothing to do for the interrupt: the ST-DMA is initialized | |
925 | * already. | |
926 | */ | |
927 | #ifdef REAL_DMA | |
928 | atari_dma_residual = 0; | |
929 | atari_dma_active = 0; | |
930 | atari_dma_stram_mask = (ATARIHW_PRESENT(EXTD_DMA) ? 0x00000000 | |
931 | : 0xff000000); | |
932 | #endif | |
933 | } | |
934 | ||
9c3f0e2b FT |
935 | NCR5380_maybe_reset_bus(instance); |
936 | ||
3ff228af FT |
937 | error = scsi_add_host(instance, NULL); |
938 | if (error) | |
939 | goto fail_host; | |
940 | ||
941 | platform_set_drvdata(pdev, instance); | |
942 | ||
943 | scsi_scan_host(instance); | |
944 | return 0; | |
945 | ||
946 | fail_host: | |
947 | if (IS_A_TT()) | |
948 | free_irq(instance->irq, instance); | |
949 | fail_irq: | |
950 | NCR5380_exit(instance); | |
0ad0eff9 | 951 | fail_init: |
3ff228af FT |
952 | scsi_host_put(instance); |
953 | fail_alloc: | |
954 | if (atari_dma_buffer) | |
955 | atari_stram_free(atari_dma_buffer); | |
956 | return error; | |
957 | } | |
958 | ||
959 | static int __exit atari_scsi_remove(struct platform_device *pdev) | |
960 | { | |
961 | struct Scsi_Host *instance = platform_get_drvdata(pdev); | |
962 | ||
963 | scsi_remove_host(instance); | |
964 | if (IS_A_TT()) | |
965 | free_irq(instance->irq, instance); | |
966 | NCR5380_exit(instance); | |
967 | scsi_host_put(instance); | |
968 | if (atari_dma_buffer) | |
969 | atari_stram_free(atari_dma_buffer); | |
970 | return 0; | |
971 | } | |
972 | ||
973 | static struct platform_driver atari_scsi_driver = { | |
974 | .remove = __exit_p(atari_scsi_remove), | |
975 | .driver = { | |
976 | .name = DRV_MODULE_NAME, | |
3ff228af FT |
977 | }, |
978 | }; | |
1da177e4 | 979 | |
3ff228af | 980 | module_platform_driver_probe(atari_scsi_driver, atari_scsi_probe); |
1da177e4 | 981 | |
3ff228af | 982 | MODULE_ALIAS("platform:" DRV_MODULE_NAME); |
1da177e4 | 983 | MODULE_LICENSE("GPL"); |