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 | ||
ded155b5 FT |
17 | /* |
18 | * Notes for Falcon SCSI DMA | |
19 | * | |
20 | * The 5380 device is one of several that all share the DMA chip. Hence | |
21 | * "locking" and "unlocking" access to this chip is required. | |
22 | * | |
23 | * Two possible schemes for ST DMA acquisition by atari_scsi are: | |
24 | * 1) The lock is taken for each command separately (i.e. can_queue == 1). | |
25 | * 2) The lock is taken when the first command arrives and released | |
26 | * when the last command is finished (i.e. can_queue > 1). | |
27 | * | |
28 | * The first alternative limits SCSI bus utilization, since interleaving | |
29 | * commands is not possible. The second gives better performance but is | |
30 | * unfair to other drivers needing to use the ST DMA chip. In order to | |
31 | * allow the IDE and floppy drivers equal access to the ST DMA chip | |
32 | * the default is can_queue == 1. | |
33 | */ | |
1da177e4 | 34 | |
1da177e4 | 35 | #include <linux/module.h> |
1da177e4 | 36 | #include <linux/types.h> |
1da177e4 | 37 | #include <linux/blkdev.h> |
1da177e4 LT |
38 | #include <linux/interrupt.h> |
39 | #include <linux/init.h> | |
40 | #include <linux/nvram.h> | |
41 | #include <linux/bitops.h> | |
eff9cf8d | 42 | #include <linux/wait.h> |
3ff228af | 43 | #include <linux/platform_device.h> |
1da177e4 LT |
44 | |
45 | #include <asm/setup.h> | |
46 | #include <asm/atarihw.h> | |
47 | #include <asm/atariints.h> | |
1da177e4 LT |
48 | #include <asm/atari_stdma.h> |
49 | #include <asm/atari_stram.h> | |
50 | #include <asm/io.h> | |
51 | ||
3ff228af FT |
52 | #include <scsi/scsi_host.h> |
53 | ||
e63449c4 FT |
54 | #define DMA_MIN_SIZE 32 |
55 | ||
4e705205 FT |
56 | /* Definitions for the core NCR5380 driver. */ |
57 | ||
4e705205 FT |
58 | #define NCR5380_implementation_fields /* none */ |
59 | ||
60 | #define NCR5380_read(reg) atari_scsi_reg_read(reg) | |
61 | #define NCR5380_write(reg, value) atari_scsi_reg_write(reg, value) | |
62 | ||
63 | #define NCR5380_queue_command atari_scsi_queue_command | |
64 | #define NCR5380_abort atari_scsi_abort | |
4e705205 FT |
65 | #define NCR5380_info atari_scsi_info |
66 | ||
52d3e561 | 67 | #define NCR5380_dma_recv_setup(instance, data, count) \ |
4e705205 | 68 | atari_scsi_dma_setup(instance, data, count, 0) |
52d3e561 | 69 | #define NCR5380_dma_send_setup(instance, data, count) \ |
4e705205 FT |
70 | atari_scsi_dma_setup(instance, data, count, 1) |
71 | #define NCR5380_dma_residual(instance) \ | |
72 | atari_scsi_dma_residual(instance) | |
73 | #define NCR5380_dma_xfer_len(instance, cmd, phase) \ | |
74 | atari_dma_xfer_len(cmd->SCp.this_residual, cmd, !((phase) & SR_IO)) | |
75 | ||
a53a21e4 | 76 | #define NCR5380_acquire_dma_irq(instance) falcon_get_lock(instance) |
e3c3da67 FT |
77 | #define NCR5380_release_dma_irq(instance) falcon_release_lock() |
78 | ||
3ff228af | 79 | #include "NCR5380.h" |
1da177e4 | 80 | |
4e705205 | 81 | |
1da177e4 LT |
82 | #define IS_A_TT() ATARIHW_PRESENT(TT_SCSI) |
83 | ||
84 | #define SCSI_DMA_WRITE_P(elt,val) \ | |
85 | do { \ | |
86 | unsigned long v = val; \ | |
87 | tt_scsi_dma.elt##_lo = v & 0xff; \ | |
88 | v >>= 8; \ | |
89 | tt_scsi_dma.elt##_lmd = v & 0xff; \ | |
90 | v >>= 8; \ | |
91 | tt_scsi_dma.elt##_hmd = v & 0xff; \ | |
92 | v >>= 8; \ | |
93 | tt_scsi_dma.elt##_hi = v & 0xff; \ | |
94 | } while(0) | |
95 | ||
96 | #define SCSI_DMA_READ_P(elt) \ | |
97 | (((((((unsigned long)tt_scsi_dma.elt##_hi << 8) | \ | |
98 | (unsigned long)tt_scsi_dma.elt##_hmd) << 8) | \ | |
99 | (unsigned long)tt_scsi_dma.elt##_lmd) << 8) | \ | |
100 | (unsigned long)tt_scsi_dma.elt##_lo) | |
101 | ||
102 | ||
103 | static inline void SCSI_DMA_SETADR(unsigned long adr) | |
104 | { | |
105 | st_dma.dma_lo = (unsigned char)adr; | |
106 | MFPDELAY(); | |
107 | adr >>= 8; | |
108 | st_dma.dma_md = (unsigned char)adr; | |
109 | MFPDELAY(); | |
110 | adr >>= 8; | |
111 | st_dma.dma_hi = (unsigned char)adr; | |
112 | MFPDELAY(); | |
113 | } | |
114 | ||
115 | static inline unsigned long SCSI_DMA_GETADR(void) | |
116 | { | |
117 | unsigned long adr; | |
118 | adr = st_dma.dma_lo; | |
119 | MFPDELAY(); | |
120 | adr |= (st_dma.dma_md & 0xff) << 8; | |
121 | MFPDELAY(); | |
122 | adr |= (st_dma.dma_hi & 0xff) << 16; | |
123 | MFPDELAY(); | |
124 | return adr; | |
125 | } | |
126 | ||
c28bda25 | 127 | static void atari_scsi_fetch_restbytes(void); |
1da177e4 | 128 | |
c28bda25 RZ |
129 | static unsigned char (*atari_scsi_reg_read)(unsigned char reg); |
130 | static void (*atari_scsi_reg_write)(unsigned char reg, unsigned char value); | |
1da177e4 | 131 | |
1da177e4 LT |
132 | static unsigned long atari_dma_residual, atari_dma_startaddr; |
133 | static short atari_dma_active; | |
134 | /* pointer to the dribble buffer */ | |
c28bda25 | 135 | static char *atari_dma_buffer; |
1da177e4 LT |
136 | /* precalculated physical address of the dribble buffer */ |
137 | static unsigned long atari_dma_phys_buffer; | |
138 | /* != 0 tells the Falcon int handler to copy data from the dribble buffer */ | |
139 | static char *atari_dma_orig_addr; | |
140 | /* size of the dribble buffer; 4k seems enough, since the Falcon cannot use | |
141 | * scatter-gather anyway, so most transfers are 1024 byte only. In the rare | |
142 | * cases where requests to physical contiguous buffers have been merged, this | |
143 | * request is <= 4k (one page). So I don't think we have to split transfers | |
144 | * just due to this buffer size... | |
145 | */ | |
146 | #define STRAM_BUFFER_SIZE (4096) | |
147 | /* mask for address bits that can't be used with the ST-DMA */ | |
148 | static unsigned long atari_dma_stram_mask; | |
149 | #define STRAM_ADDR(a) (((a) & atari_dma_stram_mask) == 0) | |
1da177e4 LT |
150 | |
151 | static int setup_can_queue = -1; | |
8d3b33f6 | 152 | module_param(setup_can_queue, int, 0); |
1da177e4 | 153 | static int setup_cmd_per_lun = -1; |
8d3b33f6 | 154 | module_param(setup_cmd_per_lun, int, 0); |
1da177e4 | 155 | static int setup_sg_tablesize = -1; |
8d3b33f6 | 156 | module_param(setup_sg_tablesize, int, 0); |
1da177e4 | 157 | static int setup_hostid = -1; |
8d3b33f6 | 158 | module_param(setup_hostid, int, 0); |
9c3f0e2b FT |
159 | static int setup_toshiba_delay = -1; |
160 | module_param(setup_toshiba_delay, int, 0); | |
1da177e4 LT |
161 | |
162 | ||
c28bda25 | 163 | static int scsi_dma_is_ignored_buserr(unsigned char dma_stat) |
1da177e4 LT |
164 | { |
165 | int i; | |
c28bda25 | 166 | unsigned long addr = SCSI_DMA_READ_P(dma_addr), end_addr; |
1da177e4 LT |
167 | |
168 | if (dma_stat & 0x01) { | |
169 | ||
170 | /* A bus error happens when DMA-ing from the last page of a | |
171 | * physical memory chunk (DMA prefetch!), but that doesn't hurt. | |
172 | * Check for this case: | |
173 | */ | |
c28bda25 RZ |
174 | |
175 | for (i = 0; i < m68k_num_memory; ++i) { | |
176 | end_addr = m68k_memory[i].addr + m68k_memory[i].size; | |
1da177e4 | 177 | if (end_addr <= addr && addr <= end_addr + 4) |
c28bda25 | 178 | return 1; |
1da177e4 LT |
179 | } |
180 | } | |
c28bda25 | 181 | return 0; |
1da177e4 LT |
182 | } |
183 | ||
184 | ||
185 | #if 0 | |
186 | /* Dead code... wasn't called anyway :-) and causes some trouble, because at | |
187 | * end-of-DMA, both SCSI ints are triggered simultaneously, so the NCR int has | |
188 | * to clear the DMA int pending bit before it allows other level 6 interrupts. | |
189 | */ | |
c28bda25 | 190 | static void scsi_dma_buserr(int irq, void *dummy) |
1da177e4 | 191 | { |
c28bda25 | 192 | unsigned char dma_stat = tt_scsi_dma.dma_ctrl; |
1da177e4 LT |
193 | |
194 | /* Don't do anything if a NCR interrupt is pending. Probably it's just | |
195 | * masked... */ | |
c28bda25 | 196 | if (atari_irq_pending(IRQ_TT_MFP_SCSI)) |
1da177e4 | 197 | return; |
c28bda25 | 198 | |
1da177e4 LT |
199 | printk("Bad SCSI DMA interrupt! dma_addr=0x%08lx dma_stat=%02x dma_cnt=%08lx\n", |
200 | SCSI_DMA_READ_P(dma_addr), dma_stat, SCSI_DMA_READ_P(dma_cnt)); | |
201 | if (dma_stat & 0x80) { | |
c28bda25 RZ |
202 | if (!scsi_dma_is_ignored_buserr(dma_stat)) |
203 | printk("SCSI DMA bus error -- bad DMA programming!\n"); | |
204 | } else { | |
1da177e4 LT |
205 | /* Under normal circumstances we never should get to this point, |
206 | * since both interrupts are triggered simultaneously and the 5380 | |
207 | * int has higher priority. When this irq is handled, that DMA | |
208 | * interrupt is cleared. So a warning message is printed here. | |
209 | */ | |
c28bda25 | 210 | printk("SCSI DMA intr ?? -- this shouldn't happen!\n"); |
1da177e4 LT |
211 | } |
212 | } | |
213 | #endif | |
214 | ||
1da177e4 | 215 | |
cd46140a | 216 | static irqreturn_t scsi_tt_intr(int irq, void *dev) |
1da177e4 | 217 | { |
cd46140a FT |
218 | struct Scsi_Host *instance = dev; |
219 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
1da177e4 LT |
220 | int dma_stat; |
221 | ||
222 | dma_stat = tt_scsi_dma.dma_ctrl; | |
223 | ||
cd46140a FT |
224 | dsprintk(NDEBUG_INTR, instance, "NCR5380 interrupt, DMA status = %02x\n", |
225 | dma_stat & 0xff); | |
1da177e4 LT |
226 | |
227 | /* Look if it was the DMA that has interrupted: First possibility | |
228 | * is that a bus error occurred... | |
229 | */ | |
230 | if (dma_stat & 0x80) { | |
c28bda25 | 231 | if (!scsi_dma_is_ignored_buserr(dma_stat)) { |
1da177e4 LT |
232 | printk(KERN_ERR "SCSI DMA caused bus error near 0x%08lx\n", |
233 | SCSI_DMA_READ_P(dma_addr)); | |
234 | printk(KERN_CRIT "SCSI DMA bus error -- bad DMA programming!"); | |
235 | } | |
236 | } | |
237 | ||
238 | /* If the DMA is active but not finished, we have the case | |
239 | * that some other 5380 interrupt occurred within the DMA transfer. | |
240 | * This means we have residual bytes, if the desired end address | |
241 | * is not yet reached. Maybe we have to fetch some bytes from the | |
242 | * rest data register, too. The residual must be calculated from | |
243 | * the address pointer, not the counter register, because only the | |
244 | * addr reg counts bytes not yet written and pending in the rest | |
245 | * data reg! | |
246 | */ | |
247 | if ((dma_stat & 0x02) && !(dma_stat & 0x40)) { | |
cd46140a FT |
248 | atari_dma_residual = hostdata->dma_len - |
249 | (SCSI_DMA_READ_P(dma_addr) - atari_dma_startaddr); | |
1da177e4 | 250 | |
d65e634a | 251 | dprintk(NDEBUG_DMA, "SCSI DMA: There are %ld residual bytes.\n", |
1da177e4 LT |
252 | atari_dma_residual); |
253 | ||
254 | if ((signed int)atari_dma_residual < 0) | |
255 | atari_dma_residual = 0; | |
256 | if ((dma_stat & 1) == 0) { | |
c28bda25 RZ |
257 | /* |
258 | * After read operations, we maybe have to | |
259 | * transport some rest bytes | |
260 | */ | |
1da177e4 | 261 | atari_scsi_fetch_restbytes(); |
c28bda25 RZ |
262 | } else { |
263 | /* | |
264 | * There seems to be a nasty bug in some SCSI-DMA/NCR | |
265 | * combinations: If a target disconnects while a write | |
266 | * operation is going on, the address register of the | |
267 | * DMA may be a few bytes farer than it actually read. | |
268 | * This is probably due to DMA prefetching and a delay | |
269 | * between DMA and NCR. Experiments showed that the | |
270 | * dma_addr is 9 bytes to high, but this could vary. | |
271 | * The problem is, that the residual is thus calculated | |
272 | * wrong and the next transfer will start behind where | |
273 | * it should. So we round up the residual to the next | |
274 | * multiple of a sector size, if it isn't already a | |
275 | * multiple and the originally expected transfer size | |
276 | * was. The latter condition is there to ensure that | |
277 | * the correction is taken only for "real" data | |
278 | * transfers and not for, e.g., the parameters of some | |
279 | * other command. These shouldn't disconnect anyway. | |
280 | */ | |
1da177e4 | 281 | if (atari_dma_residual & 0x1ff) { |
d65e634a | 282 | dprintk(NDEBUG_DMA, "SCSI DMA: DMA bug corrected, " |
1da177e4 LT |
283 | "difference %ld bytes\n", |
284 | 512 - (atari_dma_residual & 0x1ff)); | |
285 | atari_dma_residual = (atari_dma_residual + 511) & ~0x1ff; | |
286 | } | |
287 | } | |
288 | tt_scsi_dma.dma_ctrl = 0; | |
289 | } | |
290 | ||
291 | /* If the DMA is finished, fetch the rest bytes and turn it off */ | |
292 | if (dma_stat & 0x40) { | |
293 | atari_dma_residual = 0; | |
294 | if ((dma_stat & 1) == 0) | |
295 | atari_scsi_fetch_restbytes(); | |
296 | tt_scsi_dma.dma_ctrl = 0; | |
297 | } | |
298 | ||
cd46140a | 299 | NCR5380_intr(irq, dev); |
1da177e4 | 300 | |
1da177e4 LT |
301 | return IRQ_HANDLED; |
302 | } | |
303 | ||
304 | ||
cd46140a | 305 | static irqreturn_t scsi_falcon_intr(int irq, void *dev) |
1da177e4 | 306 | { |
cd46140a FT |
307 | struct Scsi_Host *instance = dev; |
308 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
1da177e4 LT |
309 | int dma_stat; |
310 | ||
311 | /* Turn off DMA and select sector counter register before | |
312 | * accessing the status register (Atari recommendation!) | |
313 | */ | |
314 | st_dma.dma_mode_status = 0x90; | |
315 | dma_stat = st_dma.dma_mode_status; | |
316 | ||
317 | /* Bit 0 indicates some error in the DMA process... don't know | |
318 | * what happened exactly (no further docu). | |
319 | */ | |
320 | if (!(dma_stat & 0x01)) { | |
321 | /* DMA error */ | |
322 | printk(KERN_CRIT "SCSI DMA error near 0x%08lx!\n", SCSI_DMA_GETADR()); | |
323 | } | |
324 | ||
325 | /* If the DMA was active, but now bit 1 is not clear, it is some | |
326 | * other 5380 interrupt that finishes the DMA transfer. We have to | |
327 | * calculate the number of residual bytes and give a warning if | |
328 | * bytes are stuck in the ST-DMA fifo (there's no way to reach them!) | |
329 | */ | |
330 | if (atari_dma_active && (dma_stat & 0x02)) { | |
c28bda25 | 331 | unsigned long transferred; |
1da177e4 LT |
332 | |
333 | transferred = SCSI_DMA_GETADR() - atari_dma_startaddr; | |
334 | /* The ST-DMA address is incremented in 2-byte steps, but the | |
335 | * data are written only in 16-byte chunks. If the number of | |
336 | * transferred bytes is not divisible by 16, the remainder is | |
337 | * lost somewhere in outer space. | |
338 | */ | |
339 | if (transferred & 15) | |
340 | printk(KERN_ERR "SCSI DMA error: %ld bytes lost in " | |
341 | "ST-DMA fifo\n", transferred & 15); | |
342 | ||
cd46140a | 343 | atari_dma_residual = hostdata->dma_len - transferred; |
d65e634a | 344 | dprintk(NDEBUG_DMA, "SCSI DMA: There are %ld residual bytes.\n", |
1da177e4 | 345 | atari_dma_residual); |
c28bda25 | 346 | } else |
1da177e4 LT |
347 | atari_dma_residual = 0; |
348 | atari_dma_active = 0; | |
349 | ||
350 | if (atari_dma_orig_addr) { | |
351 | /* If the dribble buffer was used on a read operation, copy the DMA-ed | |
352 | * data to the original destination address. | |
353 | */ | |
354 | memcpy(atari_dma_orig_addr, phys_to_virt(atari_dma_startaddr), | |
cd46140a | 355 | hostdata->dma_len - atari_dma_residual); |
1da177e4 LT |
356 | atari_dma_orig_addr = NULL; |
357 | } | |
358 | ||
cd46140a FT |
359 | NCR5380_intr(irq, dev); |
360 | ||
1da177e4 LT |
361 | return IRQ_HANDLED; |
362 | } | |
363 | ||
364 | ||
c28bda25 | 365 | static void atari_scsi_fetch_restbytes(void) |
1da177e4 LT |
366 | { |
367 | int nr; | |
368 | char *src, *dst; | |
369 | unsigned long phys_dst; | |
370 | ||
371 | /* fetch rest bytes in the DMA register */ | |
372 | phys_dst = SCSI_DMA_READ_P(dma_addr); | |
373 | nr = phys_dst & 3; | |
374 | if (nr) { | |
375 | /* there are 'nr' bytes left for the last long address | |
376 | before the DMA pointer */ | |
377 | phys_dst ^= nr; | |
d65e634a | 378 | dprintk(NDEBUG_DMA, "SCSI DMA: there are %d rest bytes for phys addr 0x%08lx", |
1da177e4 LT |
379 | nr, phys_dst); |
380 | /* The content of the DMA pointer is a physical address! */ | |
381 | dst = phys_to_virt(phys_dst); | |
d65e634a | 382 | dprintk(NDEBUG_DMA, " = virt addr %p\n", dst); |
1da177e4 LT |
383 | for (src = (char *)&tt_scsi_dma.dma_restdata; nr != 0; --nr) |
384 | *dst++ = *src++; | |
385 | } | |
386 | } | |
1da177e4 LT |
387 | |
388 | ||
1da177e4 | 389 | /* This function releases the lock on the DMA chip if there is no |
16b29e75 | 390 | * connected command and the disconnected queue is empty. |
1da177e4 LT |
391 | */ |
392 | ||
e3c3da67 | 393 | static void falcon_release_lock(void) |
1da177e4 | 394 | { |
c28bda25 RZ |
395 | if (IS_A_TT()) |
396 | return; | |
397 | ||
e3c3da67 | 398 | if (stdma_is_locked_by(scsi_falcon_intr)) |
1da177e4 | 399 | stdma_release(); |
1da177e4 LT |
400 | } |
401 | ||
402 | /* This function manages the locking of the ST-DMA. | |
403 | * If the DMA isn't locked already for SCSI, it tries to lock it by | |
404 | * calling stdma_lock(). But if the DMA is locked by the SCSI code and | |
405 | * there are other drivers waiting for the chip, we do not issue the | |
16b29e75 | 406 | * command immediately but tell the SCSI mid-layer to defer. |
1da177e4 LT |
407 | */ |
408 | ||
a53a21e4 | 409 | static int falcon_get_lock(struct Scsi_Host *instance) |
1da177e4 | 410 | { |
c28bda25 | 411 | if (IS_A_TT()) |
16b29e75 | 412 | return 1; |
1da177e4 | 413 | |
ded155b5 FT |
414 | if (stdma_is_locked_by(scsi_falcon_intr) && |
415 | instance->hostt->can_queue > 1) | |
416 | return 1; | |
417 | ||
16b29e75 | 418 | if (in_interrupt()) |
a53a21e4 | 419 | return stdma_try_lock(scsi_falcon_intr, instance); |
1da177e4 | 420 | |
a53a21e4 | 421 | stdma_lock(scsi_falcon_intr, instance); |
16b29e75 | 422 | return 1; |
1da177e4 LT |
423 | } |
424 | ||
7b54e43a GU |
425 | #ifndef MODULE |
426 | static int __init atari_scsi_setup(char *str) | |
1da177e4 LT |
427 | { |
428 | /* Format of atascsi parameter is: | |
429 | * atascsi=<can_queue>,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags> | |
3ff228af | 430 | * Defaults depend on TT or Falcon, determined at run time. |
1da177e4 LT |
431 | * Negative values mean don't change. |
432 | */ | |
9c3f0e2b | 433 | int ints[8]; |
7b54e43a GU |
434 | |
435 | get_options(str, ARRAY_SIZE(ints), ints); | |
c28bda25 | 436 | |
1da177e4 | 437 | if (ints[0] < 1) { |
c28bda25 | 438 | printk("atari_scsi_setup: no arguments!\n"); |
7b54e43a | 439 | return 0; |
1da177e4 | 440 | } |
3ff228af FT |
441 | if (ints[0] >= 1) |
442 | setup_can_queue = ints[1]; | |
443 | if (ints[0] >= 2) | |
444 | setup_cmd_per_lun = ints[2]; | |
445 | if (ints[0] >= 3) | |
446 | setup_sg_tablesize = ints[3]; | |
447 | if (ints[0] >= 4) | |
448 | setup_hostid = ints[4]; | |
c4ec6f92 | 449 | /* ints[5] (use_tagged_queuing) is ignored */ |
9c3f0e2b FT |
450 | /* ints[6] (use_pdma) is ignored */ |
451 | if (ints[0] >= 7) | |
452 | setup_toshiba_delay = ints[7]; | |
7b54e43a GU |
453 | |
454 | return 1; | |
1da177e4 LT |
455 | } |
456 | ||
7b54e43a GU |
457 | __setup("atascsi=", atari_scsi_setup); |
458 | #endif /* !MODULE */ | |
459 | ||
c28bda25 | 460 | |
107b5d53 GU |
461 | static unsigned long atari_scsi_dma_setup(struct Scsi_Host *instance, |
462 | void *data, unsigned long count, | |
463 | int dir) | |
1da177e4 | 464 | { |
c28bda25 | 465 | unsigned long addr = virt_to_phys(data); |
1da177e4 | 466 | |
d65e634a | 467 | dprintk(NDEBUG_DMA, "scsi%d: setting up dma, data = %p, phys = %lx, count = %ld, " |
1da177e4 LT |
468 | "dir = %d\n", instance->host_no, data, addr, count, dir); |
469 | ||
470 | if (!IS_A_TT() && !STRAM_ADDR(addr)) { | |
471 | /* If we have a non-DMAable address on a Falcon, use the dribble | |
472 | * buffer; 'orig_addr' != 0 in the read case tells the interrupt | |
473 | * handler to copy data from the dribble buffer to the originally | |
474 | * wanted address. | |
475 | */ | |
476 | if (dir) | |
c28bda25 | 477 | memcpy(atari_dma_buffer, data, count); |
1da177e4 LT |
478 | else |
479 | atari_dma_orig_addr = data; | |
480 | addr = atari_dma_phys_buffer; | |
481 | } | |
c28bda25 | 482 | |
1da177e4 | 483 | atari_dma_startaddr = addr; /* Needed for calculating residual later. */ |
c28bda25 | 484 | |
1da177e4 LT |
485 | /* Cache cleanup stuff: On writes, push any dirty cache out before sending |
486 | * it to the peripheral. (Must be done before DMA setup, since at least | |
487 | * the ST-DMA begins to fill internal buffers right after setup. For | |
488 | * reads, invalidate any cache, may be altered after DMA without CPU | |
489 | * knowledge. | |
c28bda25 | 490 | * |
1da177e4 LT |
491 | * ++roman: For the Medusa, there's no need at all for that cache stuff, |
492 | * because the hardware does bus snooping (fine!). | |
493 | */ | |
c28bda25 | 494 | dma_cache_maintenance(addr, count, dir); |
1da177e4 | 495 | |
1da177e4 LT |
496 | if (IS_A_TT()) { |
497 | tt_scsi_dma.dma_ctrl = dir; | |
c28bda25 RZ |
498 | SCSI_DMA_WRITE_P(dma_addr, addr); |
499 | SCSI_DMA_WRITE_P(dma_cnt, count); | |
1da177e4 | 500 | tt_scsi_dma.dma_ctrl = dir | 2; |
c28bda25 RZ |
501 | } else { /* ! IS_A_TT */ |
502 | ||
1da177e4 | 503 | /* set address */ |
c28bda25 | 504 | SCSI_DMA_SETADR(addr); |
1da177e4 LT |
505 | |
506 | /* toggle direction bit to clear FIFO and set DMA direction */ | |
507 | dir <<= 8; | |
508 | st_dma.dma_mode_status = 0x90 | dir; | |
509 | st_dma.dma_mode_status = 0x90 | (dir ^ 0x100); | |
510 | st_dma.dma_mode_status = 0x90 | dir; | |
511 | udelay(40); | |
512 | /* On writes, round up the transfer length to the next multiple of 512 | |
513 | * (see also comment at atari_dma_xfer_len()). */ | |
514 | st_dma.fdc_acces_seccount = (count + (dir ? 511 : 0)) >> 9; | |
515 | udelay(40); | |
516 | st_dma.dma_mode_status = 0x10 | dir; | |
517 | udelay(40); | |
518 | /* need not restore value of dir, only boolean value is tested */ | |
519 | atari_dma_active = 1; | |
520 | } | |
521 | ||
c28bda25 | 522 | return count; |
1da177e4 LT |
523 | } |
524 | ||
525 | ||
c28bda25 | 526 | static long atari_scsi_dma_residual(struct Scsi_Host *instance) |
1da177e4 | 527 | { |
c28bda25 | 528 | return atari_dma_residual; |
1da177e4 LT |
529 | } |
530 | ||
531 | ||
532 | #define CMD_SURELY_BLOCK_MODE 0 | |
533 | #define CMD_SURELY_BYTE_MODE 1 | |
534 | #define CMD_MODE_UNKNOWN 2 | |
535 | ||
710ddd0d | 536 | static int falcon_classify_cmd(struct scsi_cmnd *cmd) |
1da177e4 LT |
537 | { |
538 | unsigned char opcode = cmd->cmnd[0]; | |
c28bda25 | 539 | |
1da177e4 | 540 | if (opcode == READ_DEFECT_DATA || opcode == READ_LONG || |
c28bda25 RZ |
541 | opcode == READ_BUFFER) |
542 | return CMD_SURELY_BYTE_MODE; | |
1da177e4 LT |
543 | else if (opcode == READ_6 || opcode == READ_10 || |
544 | opcode == 0xa8 /* READ_12 */ || opcode == READ_REVERSE || | |
545 | opcode == RECOVER_BUFFERED_DATA) { | |
546 | /* In case of a sequential-access target (tape), special care is | |
547 | * needed here: The transfer is block-mode only if the 'fixed' bit is | |
548 | * set! */ | |
549 | if (cmd->device->type == TYPE_TAPE && !(cmd->cmnd[1] & 1)) | |
c28bda25 | 550 | return CMD_SURELY_BYTE_MODE; |
1da177e4 | 551 | else |
c28bda25 RZ |
552 | return CMD_SURELY_BLOCK_MODE; |
553 | } else | |
554 | return CMD_MODE_UNKNOWN; | |
1da177e4 LT |
555 | } |
556 | ||
557 | ||
558 | /* This function calculates the number of bytes that can be transferred via | |
559 | * DMA. On the TT, this is arbitrary, but on the Falcon we have to use the | |
560 | * ST-DMA chip. There are only multiples of 512 bytes possible and max. | |
561 | * 255*512 bytes :-( This means also, that defining READ_OVERRUNS is not | |
562 | * possible on the Falcon, since that would require to program the DMA for | |
563 | * n*512 - atari_read_overrun bytes. But it seems that the Falcon doesn't have | |
564 | * the overrun problem, so this question is academic :-) | |
565 | */ | |
566 | ||
c28bda25 | 567 | static unsigned long atari_dma_xfer_len(unsigned long wanted_len, |
710ddd0d | 568 | struct scsi_cmnd *cmd, int write_flag) |
1da177e4 LT |
569 | { |
570 | unsigned long possible_len, limit; | |
29c8a246 | 571 | |
e63449c4 FT |
572 | if (wanted_len < DMA_MIN_SIZE) |
573 | return 0; | |
574 | ||
1da177e4 LT |
575 | if (IS_A_TT()) |
576 | /* TT SCSI DMA can transfer arbitrary #bytes */ | |
c28bda25 | 577 | return wanted_len; |
1da177e4 LT |
578 | |
579 | /* ST DMA chip is stupid -- only multiples of 512 bytes! (and max. | |
580 | * 255*512 bytes, but this should be enough) | |
581 | * | |
582 | * ++roman: Aaargl! Another Falcon-SCSI problem... There are some commands | |
583 | * that return a number of bytes which cannot be known beforehand. In this | |
584 | * case, the given transfer length is an "allocation length". Now it | |
585 | * can happen that this allocation length is a multiple of 512 bytes and | |
586 | * the DMA is used. But if not n*512 bytes really arrive, some input data | |
587 | * will be lost in the ST-DMA's FIFO :-( Thus, we have to distinguish | |
588 | * between commands that do block transfers and those that do byte | |
589 | * transfers. But this isn't easy... there are lots of vendor specific | |
590 | * commands, and the user can issue any command via the | |
591 | * SCSI_IOCTL_SEND_COMMAND. | |
592 | * | |
593 | * The solution: We classify SCSI commands in 1) surely block-mode cmd.s, | |
594 | * 2) surely byte-mode cmd.s and 3) cmd.s with unknown mode. In case 1) | |
595 | * and 3), the thing to do is obvious: allow any number of blocks via DMA | |
596 | * or none. In case 2), we apply some heuristic: Byte mode is assumed if | |
597 | * the transfer (allocation) length is < 1024, hoping that no cmd. not | |
598 | * explicitly known as byte mode have such big allocation lengths... | |
599 | * BTW, all the discussion above applies only to reads. DMA writes are | |
600 | * unproblematic anyways, since the targets aborts the transfer after | |
601 | * receiving a sufficient number of bytes. | |
602 | * | |
603 | * Another point: If the transfer is from/to an non-ST-RAM address, we | |
604 | * use the dribble buffer and thus can do only STRAM_BUFFER_SIZE bytes. | |
605 | */ | |
606 | ||
607 | if (write_flag) { | |
608 | /* Write operation can always use the DMA, but the transfer size must | |
609 | * be rounded up to the next multiple of 512 (atari_dma_setup() does | |
610 | * this). | |
611 | */ | |
612 | possible_len = wanted_len; | |
c28bda25 | 613 | } else { |
1da177e4 LT |
614 | /* Read operations: if the wanted transfer length is not a multiple of |
615 | * 512, we cannot use DMA, since the ST-DMA cannot split transfers | |
616 | * (no interrupt on DMA finished!) | |
617 | */ | |
618 | if (wanted_len & 0x1ff) | |
619 | possible_len = 0; | |
620 | else { | |
621 | /* Now classify the command (see above) and decide whether it is | |
622 | * allowed to do DMA at all */ | |
c28bda25 RZ |
623 | switch (falcon_classify_cmd(cmd)) { |
624 | case CMD_SURELY_BLOCK_MODE: | |
1da177e4 LT |
625 | possible_len = wanted_len; |
626 | break; | |
c28bda25 | 627 | case CMD_SURELY_BYTE_MODE: |
1da177e4 LT |
628 | possible_len = 0; /* DMA prohibited */ |
629 | break; | |
c28bda25 RZ |
630 | case CMD_MODE_UNKNOWN: |
631 | default: | |
1da177e4 LT |
632 | /* For unknown commands assume block transfers if the transfer |
633 | * size/allocation length is >= 1024 */ | |
634 | possible_len = (wanted_len < 1024) ? 0 : wanted_len; | |
635 | break; | |
636 | } | |
637 | } | |
638 | } | |
c28bda25 | 639 | |
1da177e4 | 640 | /* Last step: apply the hard limit on DMA transfers */ |
c28bda25 | 641 | limit = (atari_dma_buffer && !STRAM_ADDR(virt_to_phys(cmd->SCp.ptr))) ? |
1da177e4 LT |
642 | STRAM_BUFFER_SIZE : 255*512; |
643 | if (possible_len > limit) | |
644 | possible_len = limit; | |
645 | ||
646 | if (possible_len != wanted_len) | |
d65e634a | 647 | dprintk(NDEBUG_DMA, "Sorry, must cut DMA transfer size to %ld bytes " |
1da177e4 LT |
648 | "instead of %ld\n", possible_len, wanted_len); |
649 | ||
c28bda25 | 650 | return possible_len; |
1da177e4 LT |
651 | } |
652 | ||
653 | ||
1da177e4 LT |
654 | /* NCR5380 register access functions |
655 | * | |
656 | * There are separate functions for TT and Falcon, because the access | |
657 | * methods are quite different. The calling macros NCR5380_read and | |
658 | * NCR5380_write call these functions via function pointers. | |
659 | */ | |
660 | ||
c28bda25 | 661 | static unsigned char atari_scsi_tt_reg_read(unsigned char reg) |
1da177e4 | 662 | { |
c28bda25 | 663 | return tt_scsi_regp[reg * 2]; |
1da177e4 LT |
664 | } |
665 | ||
c28bda25 | 666 | static void atari_scsi_tt_reg_write(unsigned char reg, unsigned char value) |
1da177e4 LT |
667 | { |
668 | tt_scsi_regp[reg * 2] = value; | |
669 | } | |
670 | ||
c28bda25 | 671 | static unsigned char atari_scsi_falcon_reg_read(unsigned char reg) |
1da177e4 LT |
672 | { |
673 | dma_wd.dma_mode_status= (u_short)(0x88 + reg); | |
c28bda25 | 674 | return (u_char)dma_wd.fdc_acces_seccount; |
1da177e4 LT |
675 | } |
676 | ||
c28bda25 | 677 | static void atari_scsi_falcon_reg_write(unsigned char reg, unsigned char value) |
1da177e4 LT |
678 | { |
679 | dma_wd.dma_mode_status = (u_short)(0x88 + reg); | |
680 | dma_wd.fdc_acces_seccount = (u_short)value; | |
681 | } | |
682 | ||
683 | ||
52d3e561 | 684 | #include "NCR5380.c" |
1da177e4 | 685 | |
4d3d2a54 FT |
686 | static int atari_scsi_bus_reset(struct scsi_cmnd *cmd) |
687 | { | |
688 | int rv; | |
e3c3da67 FT |
689 | unsigned long flags; |
690 | ||
691 | local_irq_save(flags); | |
4d3d2a54 | 692 | |
e3c3da67 FT |
693 | /* Abort a maybe active DMA transfer */ |
694 | if (IS_A_TT()) { | |
4d3d2a54 | 695 | tt_scsi_dma.dma_ctrl = 0; |
4d3d2a54 | 696 | } else { |
4d3d2a54 FT |
697 | st_dma.dma_mode_status = 0x90; |
698 | atari_dma_active = 0; | |
699 | atari_dma_orig_addr = NULL; | |
4d3d2a54 FT |
700 | } |
701 | ||
702 | rv = NCR5380_bus_reset(cmd); | |
703 | ||
e3c3da67 FT |
704 | /* The 5380 raises its IRQ line while _RST is active but the ST DMA |
705 | * "lock" has been released so this interrupt may end up handled by | |
706 | * floppy or IDE driver (if one of them holds the lock). The NCR5380 | |
707 | * interrupt flag has been cleared already. | |
708 | */ | |
4d3d2a54 | 709 | |
e3c3da67 | 710 | local_irq_restore(flags); |
4d3d2a54 FT |
711 | |
712 | return rv; | |
713 | } | |
714 | ||
3ff228af FT |
715 | #define DRV_MODULE_NAME "atari_scsi" |
716 | #define PFX DRV_MODULE_NAME ": " | |
717 | ||
718 | static struct scsi_host_template atari_scsi_template = { | |
719 | .module = THIS_MODULE, | |
720 | .proc_name = DRV_MODULE_NAME, | |
1da177e4 | 721 | .name = "Atari native SCSI", |
1da177e4 LT |
722 | .info = atari_scsi_info, |
723 | .queuecommand = atari_scsi_queue_command, | |
724 | .eh_abort_handler = atari_scsi_abort, | |
725 | .eh_bus_reset_handler = atari_scsi_bus_reset, | |
3ff228af | 726 | .this_id = 7, |
a5217a86 | 727 | .cmd_per_lun = 2, |
aa2e2cb1 | 728 | .use_clustering = DISABLE_CLUSTERING, |
32b26a10 | 729 | .cmd_size = NCR5380_CMD_SIZE, |
1da177e4 LT |
730 | }; |
731 | ||
3ff228af FT |
732 | static int __init atari_scsi_probe(struct platform_device *pdev) |
733 | { | |
734 | struct Scsi_Host *instance; | |
735 | int error; | |
736 | struct resource *irq; | |
ef1081cb | 737 | int host_flags = 0; |
3ff228af FT |
738 | |
739 | irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0); | |
740 | if (!irq) | |
741 | return -ENODEV; | |
742 | ||
743 | if (ATARIHW_PRESENT(TT_SCSI)) { | |
744 | atari_scsi_reg_read = atari_scsi_tt_reg_read; | |
745 | atari_scsi_reg_write = atari_scsi_tt_reg_write; | |
746 | } else { | |
747 | atari_scsi_reg_read = atari_scsi_falcon_reg_read; | |
748 | atari_scsi_reg_write = atari_scsi_falcon_reg_write; | |
749 | } | |
750 | ||
3ff228af FT |
751 | if (ATARIHW_PRESENT(TT_SCSI)) { |
752 | atari_scsi_template.can_queue = 16; | |
3ff228af FT |
753 | atari_scsi_template.sg_tablesize = SG_ALL; |
754 | } else { | |
ded155b5 | 755 | atari_scsi_template.can_queue = 1; |
3ff228af FT |
756 | atari_scsi_template.sg_tablesize = SG_NONE; |
757 | } | |
758 | ||
759 | if (setup_can_queue > 0) | |
760 | atari_scsi_template.can_queue = setup_can_queue; | |
761 | ||
762 | if (setup_cmd_per_lun > 0) | |
763 | atari_scsi_template.cmd_per_lun = setup_cmd_per_lun; | |
764 | ||
765 | /* Leave sg_tablesize at 0 on a Falcon! */ | |
766 | if (ATARIHW_PRESENT(TT_SCSI) && setup_sg_tablesize >= 0) | |
767 | atari_scsi_template.sg_tablesize = setup_sg_tablesize; | |
768 | ||
769 | if (setup_hostid >= 0) { | |
770 | atari_scsi_template.this_id = setup_hostid & 7; | |
771 | } else { | |
772 | /* Test if a host id is set in the NVRam */ | |
773 | if (ATARIHW_PRESENT(TT_CLK) && nvram_check_checksum()) { | |
6225a16a | 774 | unsigned char b = nvram_read_byte(16); |
3ff228af FT |
775 | |
776 | /* Arbitration enabled? (for TOS) | |
777 | * If yes, use configured host ID | |
778 | */ | |
779 | if (b & 0x80) | |
780 | atari_scsi_template.this_id = b & 7; | |
781 | } | |
782 | } | |
783 | ||
3ff228af FT |
784 | /* If running on a Falcon and if there's TT-Ram (i.e., more than one |
785 | * memory block, since there's always ST-Ram in a Falcon), then | |
786 | * allocate a STRAM_BUFFER_SIZE byte dribble buffer for transfers | |
787 | * from/to alternative Ram. | |
788 | */ | |
789 | if (ATARIHW_PRESENT(ST_SCSI) && !ATARIHW_PRESENT(EXTD_DMA) && | |
790 | m68k_num_memory > 1) { | |
791 | atari_dma_buffer = atari_stram_alloc(STRAM_BUFFER_SIZE, "SCSI"); | |
792 | if (!atari_dma_buffer) { | |
793 | pr_err(PFX "can't allocate ST-RAM double buffer\n"); | |
794 | return -ENOMEM; | |
795 | } | |
796 | atari_dma_phys_buffer = atari_stram_to_phys(atari_dma_buffer); | |
797 | atari_dma_orig_addr = 0; | |
798 | } | |
3ff228af FT |
799 | |
800 | instance = scsi_host_alloc(&atari_scsi_template, | |
801 | sizeof(struct NCR5380_hostdata)); | |
802 | if (!instance) { | |
803 | error = -ENOMEM; | |
804 | goto fail_alloc; | |
805 | } | |
3ff228af | 806 | |
3ff228af FT |
807 | instance->irq = irq->start; |
808 | ||
ef1081cb | 809 | host_flags |= IS_A_TT() ? 0 : FLAG_LATE_DMA_SETUP; |
9c3f0e2b | 810 | host_flags |= setup_toshiba_delay > 0 ? FLAG_TOSHIBA_DELAY : 0; |
ca513fc9 | 811 | |
0ad0eff9 FT |
812 | error = NCR5380_init(instance, host_flags); |
813 | if (error) | |
814 | goto fail_init; | |
3ff228af FT |
815 | |
816 | if (IS_A_TT()) { | |
817 | error = request_irq(instance->irq, scsi_tt_intr, 0, | |
818 | "NCR5380", instance); | |
819 | if (error) { | |
820 | pr_err(PFX "request irq %d failed, aborting\n", | |
821 | instance->irq); | |
822 | goto fail_irq; | |
823 | } | |
824 | tt_mfp.active_edge |= 0x80; /* SCSI int on L->H */ | |
e4dec680 | 825 | |
3ff228af FT |
826 | tt_scsi_dma.dma_ctrl = 0; |
827 | atari_dma_residual = 0; | |
828 | ||
829 | /* While the read overruns (described by Drew Eckhardt in | |
830 | * NCR5380.c) never happened on TTs, they do in fact on the | |
831 | * Medusa (This was the cause why SCSI didn't work right for | |
832 | * so long there.) Since handling the overruns slows down | |
833 | * a bit, I turned the #ifdef's into a runtime condition. | |
834 | * | |
835 | * In principle it should be sufficient to do max. 1 byte with | |
836 | * PIO, but there is another problem on the Medusa with the DMA | |
ef1081cb | 837 | * rest data register. So read_overruns is currently set |
3ff228af FT |
838 | * to 4 to avoid having transfers that aren't a multiple of 4. |
839 | * If the rest data bug is fixed, this can be lowered to 1. | |
840 | */ | |
ef1081cb FT |
841 | if (MACH_IS_MEDUSA) { |
842 | struct NCR5380_hostdata *hostdata = | |
843 | shost_priv(instance); | |
844 | ||
845 | hostdata->read_overruns = 4; | |
846 | } | |
3ff228af FT |
847 | } else { |
848 | /* Nothing to do for the interrupt: the ST-DMA is initialized | |
849 | * already. | |
850 | */ | |
3ff228af FT |
851 | atari_dma_residual = 0; |
852 | atari_dma_active = 0; | |
853 | atari_dma_stram_mask = (ATARIHW_PRESENT(EXTD_DMA) ? 0x00000000 | |
854 | : 0xff000000); | |
3ff228af FT |
855 | } |
856 | ||
9c3f0e2b FT |
857 | NCR5380_maybe_reset_bus(instance); |
858 | ||
3ff228af FT |
859 | error = scsi_add_host(instance, NULL); |
860 | if (error) | |
861 | goto fail_host; | |
862 | ||
863 | platform_set_drvdata(pdev, instance); | |
864 | ||
865 | scsi_scan_host(instance); | |
866 | return 0; | |
867 | ||
868 | fail_host: | |
869 | if (IS_A_TT()) | |
870 | free_irq(instance->irq, instance); | |
871 | fail_irq: | |
872 | NCR5380_exit(instance); | |
0ad0eff9 | 873 | fail_init: |
3ff228af FT |
874 | scsi_host_put(instance); |
875 | fail_alloc: | |
876 | if (atari_dma_buffer) | |
877 | atari_stram_free(atari_dma_buffer); | |
878 | return error; | |
879 | } | |
880 | ||
881 | static int __exit atari_scsi_remove(struct platform_device *pdev) | |
882 | { | |
883 | struct Scsi_Host *instance = platform_get_drvdata(pdev); | |
884 | ||
885 | scsi_remove_host(instance); | |
886 | if (IS_A_TT()) | |
887 | free_irq(instance->irq, instance); | |
888 | NCR5380_exit(instance); | |
889 | scsi_host_put(instance); | |
890 | if (atari_dma_buffer) | |
891 | atari_stram_free(atari_dma_buffer); | |
892 | return 0; | |
893 | } | |
894 | ||
895 | static struct platform_driver atari_scsi_driver = { | |
896 | .remove = __exit_p(atari_scsi_remove), | |
897 | .driver = { | |
898 | .name = DRV_MODULE_NAME, | |
3ff228af FT |
899 | }, |
900 | }; | |
1da177e4 | 901 | |
3ff228af | 902 | module_platform_driver_probe(atari_scsi_driver, atari_scsi_probe); |
1da177e4 | 903 | |
3ff228af | 904 | MODULE_ALIAS("platform:" DRV_MODULE_NAME); |
1da177e4 | 905 | MODULE_LICENSE("GPL"); |