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 | ||
4e705205 FT |
88 | #define SUPPORT_TAGS |
89 | #define MAX_TAGS 32 | |
e3f463b0 | 90 | #define DMA_MIN_SIZE 32 |
4e705205 FT |
91 | |
92 | #define NCR5380_implementation_fields /* none */ | |
93 | ||
94 | #define NCR5380_read(reg) atari_scsi_reg_read(reg) | |
95 | #define NCR5380_write(reg, value) atari_scsi_reg_write(reg, value) | |
96 | ||
97 | #define NCR5380_queue_command atari_scsi_queue_command | |
98 | #define NCR5380_abort atari_scsi_abort | |
4e705205 FT |
99 | #define NCR5380_info atari_scsi_info |
100 | ||
101 | #define NCR5380_dma_read_setup(instance, data, count) \ | |
102 | atari_scsi_dma_setup(instance, data, count, 0) | |
103 | #define NCR5380_dma_write_setup(instance, data, count) \ | |
104 | atari_scsi_dma_setup(instance, data, count, 1) | |
105 | #define NCR5380_dma_residual(instance) \ | |
106 | atari_scsi_dma_residual(instance) | |
107 | #define NCR5380_dma_xfer_len(instance, cmd, phase) \ | |
108 | atari_dma_xfer_len(cmd->SCp.this_residual, cmd, !((phase) & SR_IO)) | |
109 | ||
a53a21e4 | 110 | #define NCR5380_acquire_dma_irq(instance) falcon_get_lock(instance) |
e3c3da67 FT |
111 | #define NCR5380_release_dma_irq(instance) falcon_release_lock() |
112 | ||
3ff228af | 113 | #include "NCR5380.h" |
1da177e4 | 114 | |
4e705205 | 115 | |
1da177e4 LT |
116 | #define IS_A_TT() ATARIHW_PRESENT(TT_SCSI) |
117 | ||
118 | #define SCSI_DMA_WRITE_P(elt,val) \ | |
119 | do { \ | |
120 | unsigned long v = val; \ | |
121 | tt_scsi_dma.elt##_lo = v & 0xff; \ | |
122 | v >>= 8; \ | |
123 | tt_scsi_dma.elt##_lmd = v & 0xff; \ | |
124 | v >>= 8; \ | |
125 | tt_scsi_dma.elt##_hmd = v & 0xff; \ | |
126 | v >>= 8; \ | |
127 | tt_scsi_dma.elt##_hi = v & 0xff; \ | |
128 | } while(0) | |
129 | ||
130 | #define SCSI_DMA_READ_P(elt) \ | |
131 | (((((((unsigned long)tt_scsi_dma.elt##_hi << 8) | \ | |
132 | (unsigned long)tt_scsi_dma.elt##_hmd) << 8) | \ | |
133 | (unsigned long)tt_scsi_dma.elt##_lmd) << 8) | \ | |
134 | (unsigned long)tt_scsi_dma.elt##_lo) | |
135 | ||
136 | ||
137 | static inline void SCSI_DMA_SETADR(unsigned long adr) | |
138 | { | |
139 | st_dma.dma_lo = (unsigned char)adr; | |
140 | MFPDELAY(); | |
141 | adr >>= 8; | |
142 | st_dma.dma_md = (unsigned char)adr; | |
143 | MFPDELAY(); | |
144 | adr >>= 8; | |
145 | st_dma.dma_hi = (unsigned char)adr; | |
146 | MFPDELAY(); | |
147 | } | |
148 | ||
149 | static inline unsigned long SCSI_DMA_GETADR(void) | |
150 | { | |
151 | unsigned long adr; | |
152 | adr = st_dma.dma_lo; | |
153 | MFPDELAY(); | |
154 | adr |= (st_dma.dma_md & 0xff) << 8; | |
155 | MFPDELAY(); | |
156 | adr |= (st_dma.dma_hi & 0xff) << 16; | |
157 | MFPDELAY(); | |
158 | return adr; | |
159 | } | |
160 | ||
c28bda25 | 161 | static void atari_scsi_fetch_restbytes(void); |
1da177e4 | 162 | |
c28bda25 RZ |
163 | static unsigned char (*atari_scsi_reg_read)(unsigned char reg); |
164 | static void (*atari_scsi_reg_write)(unsigned char reg, unsigned char value); | |
1da177e4 | 165 | |
1da177e4 LT |
166 | static unsigned long atari_dma_residual, atari_dma_startaddr; |
167 | static short atari_dma_active; | |
168 | /* pointer to the dribble buffer */ | |
c28bda25 | 169 | static char *atari_dma_buffer; |
1da177e4 LT |
170 | /* precalculated physical address of the dribble buffer */ |
171 | static unsigned long atari_dma_phys_buffer; | |
172 | /* != 0 tells the Falcon int handler to copy data from the dribble buffer */ | |
173 | static char *atari_dma_orig_addr; | |
174 | /* size of the dribble buffer; 4k seems enough, since the Falcon cannot use | |
175 | * scatter-gather anyway, so most transfers are 1024 byte only. In the rare | |
176 | * cases where requests to physical contiguous buffers have been merged, this | |
177 | * request is <= 4k (one page). So I don't think we have to split transfers | |
178 | * just due to this buffer size... | |
179 | */ | |
180 | #define STRAM_BUFFER_SIZE (4096) | |
181 | /* mask for address bits that can't be used with the ST-DMA */ | |
182 | static unsigned long atari_dma_stram_mask; | |
183 | #define STRAM_ADDR(a) (((a) & atari_dma_stram_mask) == 0) | |
1da177e4 LT |
184 | |
185 | static int setup_can_queue = -1; | |
8d3b33f6 | 186 | module_param(setup_can_queue, int, 0); |
1da177e4 | 187 | static int setup_cmd_per_lun = -1; |
8d3b33f6 | 188 | module_param(setup_cmd_per_lun, int, 0); |
1da177e4 | 189 | static int setup_sg_tablesize = -1; |
8d3b33f6 | 190 | module_param(setup_sg_tablesize, int, 0); |
1da177e4 | 191 | static int setup_use_tagged_queuing = -1; |
8d3b33f6 | 192 | module_param(setup_use_tagged_queuing, int, 0); |
1da177e4 | 193 | static int setup_hostid = -1; |
8d3b33f6 | 194 | module_param(setup_hostid, int, 0); |
9c3f0e2b FT |
195 | static int setup_toshiba_delay = -1; |
196 | module_param(setup_toshiba_delay, int, 0); | |
1da177e4 LT |
197 | |
198 | ||
c28bda25 | 199 | static int scsi_dma_is_ignored_buserr(unsigned char dma_stat) |
1da177e4 LT |
200 | { |
201 | int i; | |
c28bda25 | 202 | unsigned long addr = SCSI_DMA_READ_P(dma_addr), end_addr; |
1da177e4 LT |
203 | |
204 | if (dma_stat & 0x01) { | |
205 | ||
206 | /* A bus error happens when DMA-ing from the last page of a | |
207 | * physical memory chunk (DMA prefetch!), but that doesn't hurt. | |
208 | * Check for this case: | |
209 | */ | |
c28bda25 RZ |
210 | |
211 | for (i = 0; i < m68k_num_memory; ++i) { | |
212 | end_addr = m68k_memory[i].addr + m68k_memory[i].size; | |
1da177e4 | 213 | if (end_addr <= addr && addr <= end_addr + 4) |
c28bda25 | 214 | return 1; |
1da177e4 LT |
215 | } |
216 | } | |
c28bda25 | 217 | return 0; |
1da177e4 LT |
218 | } |
219 | ||
220 | ||
221 | #if 0 | |
222 | /* Dead code... wasn't called anyway :-) and causes some trouble, because at | |
223 | * end-of-DMA, both SCSI ints are triggered simultaneously, so the NCR int has | |
224 | * to clear the DMA int pending bit before it allows other level 6 interrupts. | |
225 | */ | |
c28bda25 | 226 | static void scsi_dma_buserr(int irq, void *dummy) |
1da177e4 | 227 | { |
c28bda25 | 228 | unsigned char dma_stat = tt_scsi_dma.dma_ctrl; |
1da177e4 LT |
229 | |
230 | /* Don't do anything if a NCR interrupt is pending. Probably it's just | |
231 | * masked... */ | |
c28bda25 | 232 | if (atari_irq_pending(IRQ_TT_MFP_SCSI)) |
1da177e4 | 233 | return; |
c28bda25 | 234 | |
1da177e4 LT |
235 | printk("Bad SCSI DMA interrupt! dma_addr=0x%08lx dma_stat=%02x dma_cnt=%08lx\n", |
236 | SCSI_DMA_READ_P(dma_addr), dma_stat, SCSI_DMA_READ_P(dma_cnt)); | |
237 | if (dma_stat & 0x80) { | |
c28bda25 RZ |
238 | if (!scsi_dma_is_ignored_buserr(dma_stat)) |
239 | printk("SCSI DMA bus error -- bad DMA programming!\n"); | |
240 | } else { | |
1da177e4 LT |
241 | /* Under normal circumstances we never should get to this point, |
242 | * since both interrupts are triggered simultaneously and the 5380 | |
243 | * int has higher priority. When this irq is handled, that DMA | |
244 | * interrupt is cleared. So a warning message is printed here. | |
245 | */ | |
c28bda25 | 246 | printk("SCSI DMA intr ?? -- this shouldn't happen!\n"); |
1da177e4 LT |
247 | } |
248 | } | |
249 | #endif | |
250 | ||
1da177e4 | 251 | |
cd46140a | 252 | static irqreturn_t scsi_tt_intr(int irq, void *dev) |
1da177e4 | 253 | { |
cd46140a FT |
254 | struct Scsi_Host *instance = dev; |
255 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
1da177e4 LT |
256 | int dma_stat; |
257 | ||
258 | dma_stat = tt_scsi_dma.dma_ctrl; | |
259 | ||
cd46140a FT |
260 | dsprintk(NDEBUG_INTR, instance, "NCR5380 interrupt, DMA status = %02x\n", |
261 | dma_stat & 0xff); | |
1da177e4 LT |
262 | |
263 | /* Look if it was the DMA that has interrupted: First possibility | |
264 | * is that a bus error occurred... | |
265 | */ | |
266 | if (dma_stat & 0x80) { | |
c28bda25 | 267 | if (!scsi_dma_is_ignored_buserr(dma_stat)) { |
1da177e4 LT |
268 | printk(KERN_ERR "SCSI DMA caused bus error near 0x%08lx\n", |
269 | SCSI_DMA_READ_P(dma_addr)); | |
270 | printk(KERN_CRIT "SCSI DMA bus error -- bad DMA programming!"); | |
271 | } | |
272 | } | |
273 | ||
274 | /* If the DMA is active but not finished, we have the case | |
275 | * that some other 5380 interrupt occurred within the DMA transfer. | |
276 | * This means we have residual bytes, if the desired end address | |
277 | * is not yet reached. Maybe we have to fetch some bytes from the | |
278 | * rest data register, too. The residual must be calculated from | |
279 | * the address pointer, not the counter register, because only the | |
280 | * addr reg counts bytes not yet written and pending in the rest | |
281 | * data reg! | |
282 | */ | |
283 | if ((dma_stat & 0x02) && !(dma_stat & 0x40)) { | |
cd46140a FT |
284 | atari_dma_residual = hostdata->dma_len - |
285 | (SCSI_DMA_READ_P(dma_addr) - atari_dma_startaddr); | |
1da177e4 | 286 | |
d65e634a | 287 | dprintk(NDEBUG_DMA, "SCSI DMA: There are %ld residual bytes.\n", |
1da177e4 LT |
288 | atari_dma_residual); |
289 | ||
290 | if ((signed int)atari_dma_residual < 0) | |
291 | atari_dma_residual = 0; | |
292 | if ((dma_stat & 1) == 0) { | |
c28bda25 RZ |
293 | /* |
294 | * After read operations, we maybe have to | |
295 | * transport some rest bytes | |
296 | */ | |
1da177e4 | 297 | atari_scsi_fetch_restbytes(); |
c28bda25 RZ |
298 | } else { |
299 | /* | |
300 | * There seems to be a nasty bug in some SCSI-DMA/NCR | |
301 | * combinations: If a target disconnects while a write | |
302 | * operation is going on, the address register of the | |
303 | * DMA may be a few bytes farer than it actually read. | |
304 | * This is probably due to DMA prefetching and a delay | |
305 | * between DMA and NCR. Experiments showed that the | |
306 | * dma_addr is 9 bytes to high, but this could vary. | |
307 | * The problem is, that the residual is thus calculated | |
308 | * wrong and the next transfer will start behind where | |
309 | * it should. So we round up the residual to the next | |
310 | * multiple of a sector size, if it isn't already a | |
311 | * multiple and the originally expected transfer size | |
312 | * was. The latter condition is there to ensure that | |
313 | * the correction is taken only for "real" data | |
314 | * transfers and not for, e.g., the parameters of some | |
315 | * other command. These shouldn't disconnect anyway. | |
316 | */ | |
1da177e4 | 317 | if (atari_dma_residual & 0x1ff) { |
d65e634a | 318 | dprintk(NDEBUG_DMA, "SCSI DMA: DMA bug corrected, " |
1da177e4 LT |
319 | "difference %ld bytes\n", |
320 | 512 - (atari_dma_residual & 0x1ff)); | |
321 | atari_dma_residual = (atari_dma_residual + 511) & ~0x1ff; | |
322 | } | |
323 | } | |
324 | tt_scsi_dma.dma_ctrl = 0; | |
325 | } | |
326 | ||
327 | /* If the DMA is finished, fetch the rest bytes and turn it off */ | |
328 | if (dma_stat & 0x40) { | |
329 | atari_dma_residual = 0; | |
330 | if ((dma_stat & 1) == 0) | |
331 | atari_scsi_fetch_restbytes(); | |
332 | tt_scsi_dma.dma_ctrl = 0; | |
333 | } | |
334 | ||
cd46140a | 335 | NCR5380_intr(irq, dev); |
1da177e4 | 336 | |
1da177e4 LT |
337 | return IRQ_HANDLED; |
338 | } | |
339 | ||
340 | ||
cd46140a | 341 | static irqreturn_t scsi_falcon_intr(int irq, void *dev) |
1da177e4 | 342 | { |
cd46140a FT |
343 | struct Scsi_Host *instance = dev; |
344 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
1da177e4 LT |
345 | int dma_stat; |
346 | ||
347 | /* Turn off DMA and select sector counter register before | |
348 | * accessing the status register (Atari recommendation!) | |
349 | */ | |
350 | st_dma.dma_mode_status = 0x90; | |
351 | dma_stat = st_dma.dma_mode_status; | |
352 | ||
353 | /* Bit 0 indicates some error in the DMA process... don't know | |
354 | * what happened exactly (no further docu). | |
355 | */ | |
356 | if (!(dma_stat & 0x01)) { | |
357 | /* DMA error */ | |
358 | printk(KERN_CRIT "SCSI DMA error near 0x%08lx!\n", SCSI_DMA_GETADR()); | |
359 | } | |
360 | ||
361 | /* If the DMA was active, but now bit 1 is not clear, it is some | |
362 | * other 5380 interrupt that finishes the DMA transfer. We have to | |
363 | * calculate the number of residual bytes and give a warning if | |
364 | * bytes are stuck in the ST-DMA fifo (there's no way to reach them!) | |
365 | */ | |
366 | if (atari_dma_active && (dma_stat & 0x02)) { | |
c28bda25 | 367 | unsigned long transferred; |
1da177e4 LT |
368 | |
369 | transferred = SCSI_DMA_GETADR() - atari_dma_startaddr; | |
370 | /* The ST-DMA address is incremented in 2-byte steps, but the | |
371 | * data are written only in 16-byte chunks. If the number of | |
372 | * transferred bytes is not divisible by 16, the remainder is | |
373 | * lost somewhere in outer space. | |
374 | */ | |
375 | if (transferred & 15) | |
376 | printk(KERN_ERR "SCSI DMA error: %ld bytes lost in " | |
377 | "ST-DMA fifo\n", transferred & 15); | |
378 | ||
cd46140a | 379 | atari_dma_residual = hostdata->dma_len - transferred; |
d65e634a | 380 | dprintk(NDEBUG_DMA, "SCSI DMA: There are %ld residual bytes.\n", |
1da177e4 | 381 | atari_dma_residual); |
c28bda25 | 382 | } else |
1da177e4 LT |
383 | atari_dma_residual = 0; |
384 | atari_dma_active = 0; | |
385 | ||
386 | if (atari_dma_orig_addr) { | |
387 | /* If the dribble buffer was used on a read operation, copy the DMA-ed | |
388 | * data to the original destination address. | |
389 | */ | |
390 | memcpy(atari_dma_orig_addr, phys_to_virt(atari_dma_startaddr), | |
cd46140a | 391 | hostdata->dma_len - atari_dma_residual); |
1da177e4 LT |
392 | atari_dma_orig_addr = NULL; |
393 | } | |
394 | ||
cd46140a FT |
395 | NCR5380_intr(irq, dev); |
396 | ||
1da177e4 LT |
397 | return IRQ_HANDLED; |
398 | } | |
399 | ||
400 | ||
c28bda25 | 401 | static void atari_scsi_fetch_restbytes(void) |
1da177e4 LT |
402 | { |
403 | int nr; | |
404 | char *src, *dst; | |
405 | unsigned long phys_dst; | |
406 | ||
407 | /* fetch rest bytes in the DMA register */ | |
408 | phys_dst = SCSI_DMA_READ_P(dma_addr); | |
409 | nr = phys_dst & 3; | |
410 | if (nr) { | |
411 | /* there are 'nr' bytes left for the last long address | |
412 | before the DMA pointer */ | |
413 | phys_dst ^= nr; | |
d65e634a | 414 | dprintk(NDEBUG_DMA, "SCSI DMA: there are %d rest bytes for phys addr 0x%08lx", |
1da177e4 LT |
415 | nr, phys_dst); |
416 | /* The content of the DMA pointer is a physical address! */ | |
417 | dst = phys_to_virt(phys_dst); | |
d65e634a | 418 | dprintk(NDEBUG_DMA, " = virt addr %p\n", dst); |
1da177e4 LT |
419 | for (src = (char *)&tt_scsi_dma.dma_restdata; nr != 0; --nr) |
420 | *dst++ = *src++; | |
421 | } | |
422 | } | |
1da177e4 LT |
423 | |
424 | ||
1da177e4 | 425 | /* This function releases the lock on the DMA chip if there is no |
16b29e75 | 426 | * connected command and the disconnected queue is empty. |
1da177e4 LT |
427 | */ |
428 | ||
e3c3da67 | 429 | static void falcon_release_lock(void) |
1da177e4 | 430 | { |
c28bda25 RZ |
431 | if (IS_A_TT()) |
432 | return; | |
433 | ||
e3c3da67 | 434 | if (stdma_is_locked_by(scsi_falcon_intr)) |
1da177e4 | 435 | stdma_release(); |
1da177e4 LT |
436 | } |
437 | ||
438 | /* This function manages the locking of the ST-DMA. | |
439 | * If the DMA isn't locked already for SCSI, it tries to lock it by | |
440 | * calling stdma_lock(). But if the DMA is locked by the SCSI code and | |
441 | * there are other drivers waiting for the chip, we do not issue the | |
16b29e75 | 442 | * command immediately but tell the SCSI mid-layer to defer. |
1da177e4 LT |
443 | */ |
444 | ||
a53a21e4 | 445 | static int falcon_get_lock(struct Scsi_Host *instance) |
1da177e4 | 446 | { |
c28bda25 | 447 | if (IS_A_TT()) |
16b29e75 | 448 | return 1; |
1da177e4 | 449 | |
16b29e75 | 450 | if (in_interrupt()) |
a53a21e4 | 451 | return stdma_try_lock(scsi_falcon_intr, instance); |
1da177e4 | 452 | |
a53a21e4 | 453 | stdma_lock(scsi_falcon_intr, instance); |
16b29e75 | 454 | return 1; |
1da177e4 LT |
455 | } |
456 | ||
7b54e43a GU |
457 | #ifndef MODULE |
458 | static int __init atari_scsi_setup(char *str) | |
1da177e4 LT |
459 | { |
460 | /* Format of atascsi parameter is: | |
461 | * atascsi=<can_queue>,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags> | |
3ff228af | 462 | * Defaults depend on TT or Falcon, determined at run time. |
1da177e4 LT |
463 | * Negative values mean don't change. |
464 | */ | |
9c3f0e2b | 465 | int ints[8]; |
7b54e43a GU |
466 | |
467 | get_options(str, ARRAY_SIZE(ints), ints); | |
c28bda25 | 468 | |
1da177e4 | 469 | if (ints[0] < 1) { |
c28bda25 | 470 | printk("atari_scsi_setup: no arguments!\n"); |
7b54e43a | 471 | return 0; |
1da177e4 | 472 | } |
3ff228af FT |
473 | if (ints[0] >= 1) |
474 | setup_can_queue = ints[1]; | |
475 | if (ints[0] >= 2) | |
476 | setup_cmd_per_lun = ints[2]; | |
477 | if (ints[0] >= 3) | |
478 | setup_sg_tablesize = ints[3]; | |
479 | if (ints[0] >= 4) | |
480 | setup_hostid = ints[4]; | |
3ff228af FT |
481 | if (ints[0] >= 5) |
482 | setup_use_tagged_queuing = ints[5]; | |
9c3f0e2b FT |
483 | /* ints[6] (use_pdma) is ignored */ |
484 | if (ints[0] >= 7) | |
485 | setup_toshiba_delay = ints[7]; | |
7b54e43a GU |
486 | |
487 | return 1; | |
1da177e4 LT |
488 | } |
489 | ||
7b54e43a GU |
490 | __setup("atascsi=", atari_scsi_setup); |
491 | #endif /* !MODULE */ | |
492 | ||
c28bda25 | 493 | |
107b5d53 GU |
494 | static unsigned long atari_scsi_dma_setup(struct Scsi_Host *instance, |
495 | void *data, unsigned long count, | |
496 | int dir) | |
1da177e4 | 497 | { |
c28bda25 | 498 | unsigned long addr = virt_to_phys(data); |
1da177e4 | 499 | |
d65e634a | 500 | dprintk(NDEBUG_DMA, "scsi%d: setting up dma, data = %p, phys = %lx, count = %ld, " |
1da177e4 LT |
501 | "dir = %d\n", instance->host_no, data, addr, count, dir); |
502 | ||
503 | if (!IS_A_TT() && !STRAM_ADDR(addr)) { | |
504 | /* If we have a non-DMAable address on a Falcon, use the dribble | |
505 | * buffer; 'orig_addr' != 0 in the read case tells the interrupt | |
506 | * handler to copy data from the dribble buffer to the originally | |
507 | * wanted address. | |
508 | */ | |
509 | if (dir) | |
c28bda25 | 510 | memcpy(atari_dma_buffer, data, count); |
1da177e4 LT |
511 | else |
512 | atari_dma_orig_addr = data; | |
513 | addr = atari_dma_phys_buffer; | |
514 | } | |
c28bda25 | 515 | |
1da177e4 | 516 | atari_dma_startaddr = addr; /* Needed for calculating residual later. */ |
c28bda25 | 517 | |
1da177e4 LT |
518 | /* Cache cleanup stuff: On writes, push any dirty cache out before sending |
519 | * it to the peripheral. (Must be done before DMA setup, since at least | |
520 | * the ST-DMA begins to fill internal buffers right after setup. For | |
521 | * reads, invalidate any cache, may be altered after DMA without CPU | |
522 | * knowledge. | |
c28bda25 | 523 | * |
1da177e4 LT |
524 | * ++roman: For the Medusa, there's no need at all for that cache stuff, |
525 | * because the hardware does bus snooping (fine!). | |
526 | */ | |
c28bda25 | 527 | dma_cache_maintenance(addr, count, dir); |
1da177e4 LT |
528 | |
529 | if (count == 0) | |
530 | printk(KERN_NOTICE "SCSI warning: DMA programmed for 0 bytes !\n"); | |
531 | ||
532 | if (IS_A_TT()) { | |
533 | tt_scsi_dma.dma_ctrl = dir; | |
c28bda25 RZ |
534 | SCSI_DMA_WRITE_P(dma_addr, addr); |
535 | SCSI_DMA_WRITE_P(dma_cnt, count); | |
1da177e4 | 536 | tt_scsi_dma.dma_ctrl = dir | 2; |
c28bda25 RZ |
537 | } else { /* ! IS_A_TT */ |
538 | ||
1da177e4 | 539 | /* set address */ |
c28bda25 | 540 | SCSI_DMA_SETADR(addr); |
1da177e4 LT |
541 | |
542 | /* toggle direction bit to clear FIFO and set DMA direction */ | |
543 | dir <<= 8; | |
544 | st_dma.dma_mode_status = 0x90 | dir; | |
545 | st_dma.dma_mode_status = 0x90 | (dir ^ 0x100); | |
546 | st_dma.dma_mode_status = 0x90 | dir; | |
547 | udelay(40); | |
548 | /* On writes, round up the transfer length to the next multiple of 512 | |
549 | * (see also comment at atari_dma_xfer_len()). */ | |
550 | st_dma.fdc_acces_seccount = (count + (dir ? 511 : 0)) >> 9; | |
551 | udelay(40); | |
552 | st_dma.dma_mode_status = 0x10 | dir; | |
553 | udelay(40); | |
554 | /* need not restore value of dir, only boolean value is tested */ | |
555 | atari_dma_active = 1; | |
556 | } | |
557 | ||
c28bda25 | 558 | return count; |
1da177e4 LT |
559 | } |
560 | ||
561 | ||
c28bda25 | 562 | static long atari_scsi_dma_residual(struct Scsi_Host *instance) |
1da177e4 | 563 | { |
c28bda25 | 564 | return atari_dma_residual; |
1da177e4 LT |
565 | } |
566 | ||
567 | ||
568 | #define CMD_SURELY_BLOCK_MODE 0 | |
569 | #define CMD_SURELY_BYTE_MODE 1 | |
570 | #define CMD_MODE_UNKNOWN 2 | |
571 | ||
710ddd0d | 572 | static int falcon_classify_cmd(struct scsi_cmnd *cmd) |
1da177e4 LT |
573 | { |
574 | unsigned char opcode = cmd->cmnd[0]; | |
c28bda25 | 575 | |
1da177e4 | 576 | if (opcode == READ_DEFECT_DATA || opcode == READ_LONG || |
c28bda25 RZ |
577 | opcode == READ_BUFFER) |
578 | return CMD_SURELY_BYTE_MODE; | |
1da177e4 LT |
579 | else if (opcode == READ_6 || opcode == READ_10 || |
580 | opcode == 0xa8 /* READ_12 */ || opcode == READ_REVERSE || | |
581 | opcode == RECOVER_BUFFERED_DATA) { | |
582 | /* In case of a sequential-access target (tape), special care is | |
583 | * needed here: The transfer is block-mode only if the 'fixed' bit is | |
584 | * set! */ | |
585 | if (cmd->device->type == TYPE_TAPE && !(cmd->cmnd[1] & 1)) | |
c28bda25 | 586 | return CMD_SURELY_BYTE_MODE; |
1da177e4 | 587 | else |
c28bda25 RZ |
588 | return CMD_SURELY_BLOCK_MODE; |
589 | } else | |
590 | return CMD_MODE_UNKNOWN; | |
1da177e4 LT |
591 | } |
592 | ||
593 | ||
594 | /* This function calculates the number of bytes that can be transferred via | |
595 | * DMA. On the TT, this is arbitrary, but on the Falcon we have to use the | |
596 | * ST-DMA chip. There are only multiples of 512 bytes possible and max. | |
597 | * 255*512 bytes :-( This means also, that defining READ_OVERRUNS is not | |
598 | * possible on the Falcon, since that would require to program the DMA for | |
599 | * n*512 - atari_read_overrun bytes. But it seems that the Falcon doesn't have | |
600 | * the overrun problem, so this question is academic :-) | |
601 | */ | |
602 | ||
c28bda25 | 603 | static unsigned long atari_dma_xfer_len(unsigned long wanted_len, |
710ddd0d | 604 | struct scsi_cmnd *cmd, int write_flag) |
1da177e4 LT |
605 | { |
606 | unsigned long possible_len, limit; | |
29c8a246 | 607 | |
1da177e4 LT |
608 | if (IS_A_TT()) |
609 | /* TT SCSI DMA can transfer arbitrary #bytes */ | |
c28bda25 | 610 | return wanted_len; |
1da177e4 LT |
611 | |
612 | /* ST DMA chip is stupid -- only multiples of 512 bytes! (and max. | |
613 | * 255*512 bytes, but this should be enough) | |
614 | * | |
615 | * ++roman: Aaargl! Another Falcon-SCSI problem... There are some commands | |
616 | * that return a number of bytes which cannot be known beforehand. In this | |
617 | * case, the given transfer length is an "allocation length". Now it | |
618 | * can happen that this allocation length is a multiple of 512 bytes and | |
619 | * the DMA is used. But if not n*512 bytes really arrive, some input data | |
620 | * will be lost in the ST-DMA's FIFO :-( Thus, we have to distinguish | |
621 | * between commands that do block transfers and those that do byte | |
622 | * transfers. But this isn't easy... there are lots of vendor specific | |
623 | * commands, and the user can issue any command via the | |
624 | * SCSI_IOCTL_SEND_COMMAND. | |
625 | * | |
626 | * The solution: We classify SCSI commands in 1) surely block-mode cmd.s, | |
627 | * 2) surely byte-mode cmd.s and 3) cmd.s with unknown mode. In case 1) | |
628 | * and 3), the thing to do is obvious: allow any number of blocks via DMA | |
629 | * or none. In case 2), we apply some heuristic: Byte mode is assumed if | |
630 | * the transfer (allocation) length is < 1024, hoping that no cmd. not | |
631 | * explicitly known as byte mode have such big allocation lengths... | |
632 | * BTW, all the discussion above applies only to reads. DMA writes are | |
633 | * unproblematic anyways, since the targets aborts the transfer after | |
634 | * receiving a sufficient number of bytes. | |
635 | * | |
636 | * Another point: If the transfer is from/to an non-ST-RAM address, we | |
637 | * use the dribble buffer and thus can do only STRAM_BUFFER_SIZE bytes. | |
638 | */ | |
639 | ||
640 | if (write_flag) { | |
641 | /* Write operation can always use the DMA, but the transfer size must | |
642 | * be rounded up to the next multiple of 512 (atari_dma_setup() does | |
643 | * this). | |
644 | */ | |
645 | possible_len = wanted_len; | |
c28bda25 | 646 | } else { |
1da177e4 LT |
647 | /* Read operations: if the wanted transfer length is not a multiple of |
648 | * 512, we cannot use DMA, since the ST-DMA cannot split transfers | |
649 | * (no interrupt on DMA finished!) | |
650 | */ | |
651 | if (wanted_len & 0x1ff) | |
652 | possible_len = 0; | |
653 | else { | |
654 | /* Now classify the command (see above) and decide whether it is | |
655 | * allowed to do DMA at all */ | |
c28bda25 RZ |
656 | switch (falcon_classify_cmd(cmd)) { |
657 | case CMD_SURELY_BLOCK_MODE: | |
1da177e4 LT |
658 | possible_len = wanted_len; |
659 | break; | |
c28bda25 | 660 | case CMD_SURELY_BYTE_MODE: |
1da177e4 LT |
661 | possible_len = 0; /* DMA prohibited */ |
662 | break; | |
c28bda25 RZ |
663 | case CMD_MODE_UNKNOWN: |
664 | default: | |
1da177e4 LT |
665 | /* For unknown commands assume block transfers if the transfer |
666 | * size/allocation length is >= 1024 */ | |
667 | possible_len = (wanted_len < 1024) ? 0 : wanted_len; | |
668 | break; | |
669 | } | |
670 | } | |
671 | } | |
c28bda25 | 672 | |
1da177e4 | 673 | /* Last step: apply the hard limit on DMA transfers */ |
c28bda25 | 674 | limit = (atari_dma_buffer && !STRAM_ADDR(virt_to_phys(cmd->SCp.ptr))) ? |
1da177e4 LT |
675 | STRAM_BUFFER_SIZE : 255*512; |
676 | if (possible_len > limit) | |
677 | possible_len = limit; | |
678 | ||
679 | if (possible_len != wanted_len) | |
d65e634a | 680 | dprintk(NDEBUG_DMA, "Sorry, must cut DMA transfer size to %ld bytes " |
1da177e4 LT |
681 | "instead of %ld\n", possible_len, wanted_len); |
682 | ||
c28bda25 | 683 | return possible_len; |
1da177e4 LT |
684 | } |
685 | ||
686 | ||
1da177e4 LT |
687 | /* NCR5380 register access functions |
688 | * | |
689 | * There are separate functions for TT and Falcon, because the access | |
690 | * methods are quite different. The calling macros NCR5380_read and | |
691 | * NCR5380_write call these functions via function pointers. | |
692 | */ | |
693 | ||
c28bda25 | 694 | static unsigned char atari_scsi_tt_reg_read(unsigned char reg) |
1da177e4 | 695 | { |
c28bda25 | 696 | return tt_scsi_regp[reg * 2]; |
1da177e4 LT |
697 | } |
698 | ||
c28bda25 | 699 | static void atari_scsi_tt_reg_write(unsigned char reg, unsigned char value) |
1da177e4 LT |
700 | { |
701 | tt_scsi_regp[reg * 2] = value; | |
702 | } | |
703 | ||
c28bda25 | 704 | static unsigned char atari_scsi_falcon_reg_read(unsigned char reg) |
1da177e4 LT |
705 | { |
706 | dma_wd.dma_mode_status= (u_short)(0x88 + reg); | |
c28bda25 | 707 | return (u_char)dma_wd.fdc_acces_seccount; |
1da177e4 LT |
708 | } |
709 | ||
c28bda25 | 710 | static void atari_scsi_falcon_reg_write(unsigned char reg, unsigned char value) |
1da177e4 LT |
711 | { |
712 | dma_wd.dma_mode_status = (u_short)(0x88 + reg); | |
713 | dma_wd.fdc_acces_seccount = (u_short)value; | |
714 | } | |
715 | ||
716 | ||
717 | #include "atari_NCR5380.c" | |
718 | ||
4d3d2a54 FT |
719 | static int atari_scsi_bus_reset(struct scsi_cmnd *cmd) |
720 | { | |
721 | int rv; | |
e3c3da67 FT |
722 | unsigned long flags; |
723 | ||
724 | local_irq_save(flags); | |
4d3d2a54 | 725 | |
e3c3da67 FT |
726 | /* Abort a maybe active DMA transfer */ |
727 | if (IS_A_TT()) { | |
4d3d2a54 | 728 | tt_scsi_dma.dma_ctrl = 0; |
4d3d2a54 | 729 | } else { |
4d3d2a54 FT |
730 | st_dma.dma_mode_status = 0x90; |
731 | atari_dma_active = 0; | |
732 | atari_dma_orig_addr = NULL; | |
4d3d2a54 FT |
733 | } |
734 | ||
735 | rv = NCR5380_bus_reset(cmd); | |
736 | ||
e3c3da67 FT |
737 | /* The 5380 raises its IRQ line while _RST is active but the ST DMA |
738 | * "lock" has been released so this interrupt may end up handled by | |
739 | * floppy or IDE driver (if one of them holds the lock). The NCR5380 | |
740 | * interrupt flag has been cleared already. | |
741 | */ | |
4d3d2a54 | 742 | |
e3c3da67 | 743 | local_irq_restore(flags); |
4d3d2a54 FT |
744 | |
745 | return rv; | |
746 | } | |
747 | ||
3ff228af FT |
748 | #define DRV_MODULE_NAME "atari_scsi" |
749 | #define PFX DRV_MODULE_NAME ": " | |
750 | ||
751 | static struct scsi_host_template atari_scsi_template = { | |
752 | .module = THIS_MODULE, | |
753 | .proc_name = DRV_MODULE_NAME, | |
1da177e4 | 754 | .name = "Atari native SCSI", |
1da177e4 LT |
755 | .info = atari_scsi_info, |
756 | .queuecommand = atari_scsi_queue_command, | |
757 | .eh_abort_handler = atari_scsi_abort, | |
758 | .eh_bus_reset_handler = atari_scsi_bus_reset, | |
3ff228af | 759 | .this_id = 7, |
aa2e2cb1 | 760 | .use_clustering = DISABLE_CLUSTERING, |
32b26a10 | 761 | .cmd_size = NCR5380_CMD_SIZE, |
1da177e4 LT |
762 | }; |
763 | ||
3ff228af FT |
764 | static int __init atari_scsi_probe(struct platform_device *pdev) |
765 | { | |
766 | struct Scsi_Host *instance; | |
767 | int error; | |
768 | struct resource *irq; | |
ef1081cb | 769 | int host_flags = 0; |
3ff228af FT |
770 | |
771 | irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0); | |
772 | if (!irq) | |
773 | return -ENODEV; | |
774 | ||
775 | if (ATARIHW_PRESENT(TT_SCSI)) { | |
776 | atari_scsi_reg_read = atari_scsi_tt_reg_read; | |
777 | atari_scsi_reg_write = atari_scsi_tt_reg_write; | |
778 | } else { | |
779 | atari_scsi_reg_read = atari_scsi_falcon_reg_read; | |
780 | atari_scsi_reg_write = atari_scsi_falcon_reg_write; | |
781 | } | |
782 | ||
783 | /* The values for CMD_PER_LUN and CAN_QUEUE are somehow arbitrary. | |
784 | * Higher values should work, too; try it! | |
785 | * (But cmd_per_lun costs memory!) | |
786 | * | |
787 | * But there seems to be a bug somewhere that requires CAN_QUEUE to be | |
788 | * 2*CMD_PER_LUN. At least on a TT, no spurious timeouts seen since | |
789 | * changed CMD_PER_LUN... | |
790 | * | |
791 | * Note: The Falcon currently uses 8/1 setting due to unsolved problems | |
792 | * with cmd_per_lun != 1 | |
793 | */ | |
794 | if (ATARIHW_PRESENT(TT_SCSI)) { | |
795 | atari_scsi_template.can_queue = 16; | |
796 | atari_scsi_template.cmd_per_lun = 8; | |
797 | atari_scsi_template.sg_tablesize = SG_ALL; | |
798 | } else { | |
799 | atari_scsi_template.can_queue = 8; | |
800 | atari_scsi_template.cmd_per_lun = 1; | |
801 | atari_scsi_template.sg_tablesize = SG_NONE; | |
802 | } | |
803 | ||
804 | if (setup_can_queue > 0) | |
805 | atari_scsi_template.can_queue = setup_can_queue; | |
806 | ||
807 | if (setup_cmd_per_lun > 0) | |
808 | atari_scsi_template.cmd_per_lun = setup_cmd_per_lun; | |
809 | ||
810 | /* Leave sg_tablesize at 0 on a Falcon! */ | |
811 | if (ATARIHW_PRESENT(TT_SCSI) && setup_sg_tablesize >= 0) | |
812 | atari_scsi_template.sg_tablesize = setup_sg_tablesize; | |
813 | ||
814 | if (setup_hostid >= 0) { | |
815 | atari_scsi_template.this_id = setup_hostid & 7; | |
816 | } else { | |
817 | /* Test if a host id is set in the NVRam */ | |
818 | if (ATARIHW_PRESENT(TT_CLK) && nvram_check_checksum()) { | |
6225a16a | 819 | unsigned char b = nvram_read_byte(16); |
3ff228af FT |
820 | |
821 | /* Arbitration enabled? (for TOS) | |
822 | * If yes, use configured host ID | |
823 | */ | |
824 | if (b & 0x80) | |
825 | atari_scsi_template.this_id = b & 7; | |
826 | } | |
827 | } | |
828 | ||
3ff228af FT |
829 | /* If running on a Falcon and if there's TT-Ram (i.e., more than one |
830 | * memory block, since there's always ST-Ram in a Falcon), then | |
831 | * allocate a STRAM_BUFFER_SIZE byte dribble buffer for transfers | |
832 | * from/to alternative Ram. | |
833 | */ | |
834 | if (ATARIHW_PRESENT(ST_SCSI) && !ATARIHW_PRESENT(EXTD_DMA) && | |
835 | m68k_num_memory > 1) { | |
836 | atari_dma_buffer = atari_stram_alloc(STRAM_BUFFER_SIZE, "SCSI"); | |
837 | if (!atari_dma_buffer) { | |
838 | pr_err(PFX "can't allocate ST-RAM double buffer\n"); | |
839 | return -ENOMEM; | |
840 | } | |
841 | atari_dma_phys_buffer = atari_stram_to_phys(atari_dma_buffer); | |
842 | atari_dma_orig_addr = 0; | |
843 | } | |
3ff228af FT |
844 | |
845 | instance = scsi_host_alloc(&atari_scsi_template, | |
846 | sizeof(struct NCR5380_hostdata)); | |
847 | if (!instance) { | |
848 | error = -ENOMEM; | |
849 | goto fail_alloc; | |
850 | } | |
3ff228af | 851 | |
3ff228af FT |
852 | instance->irq = irq->start; |
853 | ||
ef1081cb | 854 | host_flags |= IS_A_TT() ? 0 : FLAG_LATE_DMA_SETUP; |
ca513fc9 FT |
855 | #ifdef SUPPORT_TAGS |
856 | host_flags |= setup_use_tagged_queuing > 0 ? FLAG_TAGGED_QUEUING : 0; | |
857 | #endif | |
9c3f0e2b | 858 | host_flags |= setup_toshiba_delay > 0 ? FLAG_TOSHIBA_DELAY : 0; |
ca513fc9 | 859 | |
0ad0eff9 FT |
860 | error = NCR5380_init(instance, host_flags); |
861 | if (error) | |
862 | goto fail_init; | |
3ff228af FT |
863 | |
864 | if (IS_A_TT()) { | |
865 | error = request_irq(instance->irq, scsi_tt_intr, 0, | |
866 | "NCR5380", instance); | |
867 | if (error) { | |
868 | pr_err(PFX "request irq %d failed, aborting\n", | |
869 | instance->irq); | |
870 | goto fail_irq; | |
871 | } | |
872 | tt_mfp.active_edge |= 0x80; /* SCSI int on L->H */ | |
e4dec680 | 873 | |
3ff228af FT |
874 | tt_scsi_dma.dma_ctrl = 0; |
875 | atari_dma_residual = 0; | |
876 | ||
877 | /* While the read overruns (described by Drew Eckhardt in | |
878 | * NCR5380.c) never happened on TTs, they do in fact on the | |
879 | * Medusa (This was the cause why SCSI didn't work right for | |
880 | * so long there.) Since handling the overruns slows down | |
881 | * a bit, I turned the #ifdef's into a runtime condition. | |
882 | * | |
883 | * In principle it should be sufficient to do max. 1 byte with | |
884 | * PIO, but there is another problem on the Medusa with the DMA | |
ef1081cb | 885 | * rest data register. So read_overruns is currently set |
3ff228af FT |
886 | * to 4 to avoid having transfers that aren't a multiple of 4. |
887 | * If the rest data bug is fixed, this can be lowered to 1. | |
888 | */ | |
ef1081cb FT |
889 | if (MACH_IS_MEDUSA) { |
890 | struct NCR5380_hostdata *hostdata = | |
891 | shost_priv(instance); | |
892 | ||
893 | hostdata->read_overruns = 4; | |
894 | } | |
3ff228af FT |
895 | } else { |
896 | /* Nothing to do for the interrupt: the ST-DMA is initialized | |
897 | * already. | |
898 | */ | |
3ff228af FT |
899 | atari_dma_residual = 0; |
900 | atari_dma_active = 0; | |
901 | atari_dma_stram_mask = (ATARIHW_PRESENT(EXTD_DMA) ? 0x00000000 | |
902 | : 0xff000000); | |
3ff228af FT |
903 | } |
904 | ||
9c3f0e2b FT |
905 | NCR5380_maybe_reset_bus(instance); |
906 | ||
3ff228af FT |
907 | error = scsi_add_host(instance, NULL); |
908 | if (error) | |
909 | goto fail_host; | |
910 | ||
911 | platform_set_drvdata(pdev, instance); | |
912 | ||
913 | scsi_scan_host(instance); | |
914 | return 0; | |
915 | ||
916 | fail_host: | |
917 | if (IS_A_TT()) | |
918 | free_irq(instance->irq, instance); | |
919 | fail_irq: | |
920 | NCR5380_exit(instance); | |
0ad0eff9 | 921 | fail_init: |
3ff228af FT |
922 | scsi_host_put(instance); |
923 | fail_alloc: | |
924 | if (atari_dma_buffer) | |
925 | atari_stram_free(atari_dma_buffer); | |
926 | return error; | |
927 | } | |
928 | ||
929 | static int __exit atari_scsi_remove(struct platform_device *pdev) | |
930 | { | |
931 | struct Scsi_Host *instance = platform_get_drvdata(pdev); | |
932 | ||
933 | scsi_remove_host(instance); | |
934 | if (IS_A_TT()) | |
935 | free_irq(instance->irq, instance); | |
936 | NCR5380_exit(instance); | |
937 | scsi_host_put(instance); | |
938 | if (atari_dma_buffer) | |
939 | atari_stram_free(atari_dma_buffer); | |
940 | return 0; | |
941 | } | |
942 | ||
943 | static struct platform_driver atari_scsi_driver = { | |
944 | .remove = __exit_p(atari_scsi_remove), | |
945 | .driver = { | |
946 | .name = DRV_MODULE_NAME, | |
3ff228af FT |
947 | }, |
948 | }; | |
1da177e4 | 949 | |
3ff228af | 950 | module_platform_driver_probe(atari_scsi_driver, atari_scsi_probe); |
1da177e4 | 951 | |
3ff228af | 952 | MODULE_ALIAS("platform:" DRV_MODULE_NAME); |
1da177e4 | 953 | MODULE_LICENSE("GPL"); |