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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 <[email protected]> | |
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 | ||
7c606631 FT |
60 | static u8 (*atari_scsi_reg_read)(unsigned int); |
61 | static void (*atari_scsi_reg_write)(unsigned int, u8); | |
62 | ||
4e705205 FT |
63 | #define NCR5380_read(reg) atari_scsi_reg_read(reg) |
64 | #define NCR5380_write(reg, value) atari_scsi_reg_write(reg, value) | |
65 | ||
66 | #define NCR5380_queue_command atari_scsi_queue_command | |
67 | #define NCR5380_abort atari_scsi_abort | |
4e705205 FT |
68 | #define NCR5380_info atari_scsi_info |
69 | ||
4a98f896 FT |
70 | #define NCR5380_dma_xfer_len atari_scsi_dma_xfer_len |
71 | #define NCR5380_dma_recv_setup atari_scsi_dma_recv_setup | |
72 | #define NCR5380_dma_send_setup atari_scsi_dma_send_setup | |
73 | #define NCR5380_dma_residual atari_scsi_dma_residual | |
4e705205 | 74 | |
a53a21e4 | 75 | #define NCR5380_acquire_dma_irq(instance) falcon_get_lock(instance) |
e3c3da67 FT |
76 | #define NCR5380_release_dma_irq(instance) falcon_release_lock() |
77 | ||
3ff228af | 78 | #include "NCR5380.h" |
1da177e4 | 79 | |
4e705205 | 80 | |
1da177e4 LT |
81 | #define IS_A_TT() ATARIHW_PRESENT(TT_SCSI) |
82 | ||
83 | #define SCSI_DMA_WRITE_P(elt,val) \ | |
84 | do { \ | |
85 | unsigned long v = val; \ | |
86 | tt_scsi_dma.elt##_lo = v & 0xff; \ | |
87 | v >>= 8; \ | |
88 | tt_scsi_dma.elt##_lmd = v & 0xff; \ | |
89 | v >>= 8; \ | |
90 | tt_scsi_dma.elt##_hmd = v & 0xff; \ | |
91 | v >>= 8; \ | |
92 | tt_scsi_dma.elt##_hi = v & 0xff; \ | |
93 | } while(0) | |
94 | ||
95 | #define SCSI_DMA_READ_P(elt) \ | |
96 | (((((((unsigned long)tt_scsi_dma.elt##_hi << 8) | \ | |
97 | (unsigned long)tt_scsi_dma.elt##_hmd) << 8) | \ | |
98 | (unsigned long)tt_scsi_dma.elt##_lmd) << 8) | \ | |
99 | (unsigned long)tt_scsi_dma.elt##_lo) | |
100 | ||
101 | ||
102 | static inline void SCSI_DMA_SETADR(unsigned long adr) | |
103 | { | |
104 | st_dma.dma_lo = (unsigned char)adr; | |
105 | MFPDELAY(); | |
106 | adr >>= 8; | |
107 | st_dma.dma_md = (unsigned char)adr; | |
108 | MFPDELAY(); | |
109 | adr >>= 8; | |
110 | st_dma.dma_hi = (unsigned char)adr; | |
111 | MFPDELAY(); | |
112 | } | |
113 | ||
114 | static inline unsigned long SCSI_DMA_GETADR(void) | |
115 | { | |
116 | unsigned long adr; | |
117 | adr = st_dma.dma_lo; | |
118 | MFPDELAY(); | |
119 | adr |= (st_dma.dma_md & 0xff) << 8; | |
120 | MFPDELAY(); | |
121 | adr |= (st_dma.dma_hi & 0xff) << 16; | |
122 | MFPDELAY(); | |
123 | return adr; | |
124 | } | |
125 | ||
c28bda25 | 126 | static void atari_scsi_fetch_restbytes(void); |
1da177e4 | 127 | |
1da177e4 LT |
128 | static unsigned long atari_dma_residual, atari_dma_startaddr; |
129 | static short atari_dma_active; | |
130 | /* pointer to the dribble buffer */ | |
c28bda25 | 131 | static char *atari_dma_buffer; |
1da177e4 LT |
132 | /* precalculated physical address of the dribble buffer */ |
133 | static unsigned long atari_dma_phys_buffer; | |
134 | /* != 0 tells the Falcon int handler to copy data from the dribble buffer */ | |
135 | static char *atari_dma_orig_addr; | |
136 | /* size of the dribble buffer; 4k seems enough, since the Falcon cannot use | |
137 | * scatter-gather anyway, so most transfers are 1024 byte only. In the rare | |
138 | * cases where requests to physical contiguous buffers have been merged, this | |
139 | * request is <= 4k (one page). So I don't think we have to split transfers | |
140 | * just due to this buffer size... | |
141 | */ | |
142 | #define STRAM_BUFFER_SIZE (4096) | |
143 | /* mask for address bits that can't be used with the ST-DMA */ | |
144 | static unsigned long atari_dma_stram_mask; | |
145 | #define STRAM_ADDR(a) (((a) & atari_dma_stram_mask) == 0) | |
1da177e4 LT |
146 | |
147 | static int setup_can_queue = -1; | |
8d3b33f6 | 148 | module_param(setup_can_queue, int, 0); |
1da177e4 | 149 | static int setup_cmd_per_lun = -1; |
8d3b33f6 | 150 | module_param(setup_cmd_per_lun, int, 0); |
1da177e4 | 151 | static int setup_sg_tablesize = -1; |
8d3b33f6 | 152 | module_param(setup_sg_tablesize, int, 0); |
1da177e4 | 153 | static int setup_hostid = -1; |
8d3b33f6 | 154 | module_param(setup_hostid, int, 0); |
9c3f0e2b FT |
155 | static int setup_toshiba_delay = -1; |
156 | module_param(setup_toshiba_delay, int, 0); | |
1da177e4 LT |
157 | |
158 | ||
c28bda25 | 159 | static int scsi_dma_is_ignored_buserr(unsigned char dma_stat) |
1da177e4 LT |
160 | { |
161 | int i; | |
c28bda25 | 162 | unsigned long addr = SCSI_DMA_READ_P(dma_addr), end_addr; |
1da177e4 LT |
163 | |
164 | if (dma_stat & 0x01) { | |
165 | ||
166 | /* A bus error happens when DMA-ing from the last page of a | |
167 | * physical memory chunk (DMA prefetch!), but that doesn't hurt. | |
168 | * Check for this case: | |
169 | */ | |
c28bda25 RZ |
170 | |
171 | for (i = 0; i < m68k_num_memory; ++i) { | |
172 | end_addr = m68k_memory[i].addr + m68k_memory[i].size; | |
1da177e4 | 173 | if (end_addr <= addr && addr <= end_addr + 4) |
c28bda25 | 174 | return 1; |
1da177e4 LT |
175 | } |
176 | } | |
c28bda25 | 177 | return 0; |
1da177e4 LT |
178 | } |
179 | ||
180 | ||
cd46140a | 181 | static irqreturn_t scsi_tt_intr(int irq, void *dev) |
1da177e4 | 182 | { |
cd46140a FT |
183 | struct Scsi_Host *instance = dev; |
184 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
1da177e4 LT |
185 | int dma_stat; |
186 | ||
187 | dma_stat = tt_scsi_dma.dma_ctrl; | |
188 | ||
cd46140a FT |
189 | dsprintk(NDEBUG_INTR, instance, "NCR5380 interrupt, DMA status = %02x\n", |
190 | dma_stat & 0xff); | |
1da177e4 LT |
191 | |
192 | /* Look if it was the DMA that has interrupted: First possibility | |
193 | * is that a bus error occurred... | |
194 | */ | |
195 | if (dma_stat & 0x80) { | |
c28bda25 | 196 | if (!scsi_dma_is_ignored_buserr(dma_stat)) { |
1da177e4 LT |
197 | printk(KERN_ERR "SCSI DMA caused bus error near 0x%08lx\n", |
198 | SCSI_DMA_READ_P(dma_addr)); | |
199 | printk(KERN_CRIT "SCSI DMA bus error -- bad DMA programming!"); | |
200 | } | |
201 | } | |
202 | ||
203 | /* If the DMA is active but not finished, we have the case | |
204 | * that some other 5380 interrupt occurred within the DMA transfer. | |
205 | * This means we have residual bytes, if the desired end address | |
206 | * is not yet reached. Maybe we have to fetch some bytes from the | |
207 | * rest data register, too. The residual must be calculated from | |
208 | * the address pointer, not the counter register, because only the | |
209 | * addr reg counts bytes not yet written and pending in the rest | |
210 | * data reg! | |
211 | */ | |
212 | if ((dma_stat & 0x02) && !(dma_stat & 0x40)) { | |
cd46140a FT |
213 | atari_dma_residual = hostdata->dma_len - |
214 | (SCSI_DMA_READ_P(dma_addr) - atari_dma_startaddr); | |
1da177e4 | 215 | |
d65e634a | 216 | dprintk(NDEBUG_DMA, "SCSI DMA: There are %ld residual bytes.\n", |
1da177e4 LT |
217 | atari_dma_residual); |
218 | ||
219 | if ((signed int)atari_dma_residual < 0) | |
220 | atari_dma_residual = 0; | |
221 | if ((dma_stat & 1) == 0) { | |
c28bda25 RZ |
222 | /* |
223 | * After read operations, we maybe have to | |
224 | * transport some rest bytes | |
225 | */ | |
1da177e4 | 226 | atari_scsi_fetch_restbytes(); |
c28bda25 RZ |
227 | } else { |
228 | /* | |
229 | * There seems to be a nasty bug in some SCSI-DMA/NCR | |
230 | * combinations: If a target disconnects while a write | |
231 | * operation is going on, the address register of the | |
232 | * DMA may be a few bytes farer than it actually read. | |
233 | * This is probably due to DMA prefetching and a delay | |
234 | * between DMA and NCR. Experiments showed that the | |
235 | * dma_addr is 9 bytes to high, but this could vary. | |
236 | * The problem is, that the residual is thus calculated | |
237 | * wrong and the next transfer will start behind where | |
238 | * it should. So we round up the residual to the next | |
239 | * multiple of a sector size, if it isn't already a | |
240 | * multiple and the originally expected transfer size | |
241 | * was. The latter condition is there to ensure that | |
242 | * the correction is taken only for "real" data | |
243 | * transfers and not for, e.g., the parameters of some | |
244 | * other command. These shouldn't disconnect anyway. | |
245 | */ | |
1da177e4 | 246 | if (atari_dma_residual & 0x1ff) { |
d65e634a | 247 | dprintk(NDEBUG_DMA, "SCSI DMA: DMA bug corrected, " |
1da177e4 LT |
248 | "difference %ld bytes\n", |
249 | 512 - (atari_dma_residual & 0x1ff)); | |
250 | atari_dma_residual = (atari_dma_residual + 511) & ~0x1ff; | |
251 | } | |
252 | } | |
253 | tt_scsi_dma.dma_ctrl = 0; | |
254 | } | |
255 | ||
256 | /* If the DMA is finished, fetch the rest bytes and turn it off */ | |
257 | if (dma_stat & 0x40) { | |
258 | atari_dma_residual = 0; | |
259 | if ((dma_stat & 1) == 0) | |
260 | atari_scsi_fetch_restbytes(); | |
261 | tt_scsi_dma.dma_ctrl = 0; | |
262 | } | |
263 | ||
cd46140a | 264 | NCR5380_intr(irq, dev); |
1da177e4 | 265 | |
1da177e4 LT |
266 | return IRQ_HANDLED; |
267 | } | |
268 | ||
269 | ||
cd46140a | 270 | static irqreturn_t scsi_falcon_intr(int irq, void *dev) |
1da177e4 | 271 | { |
cd46140a FT |
272 | struct Scsi_Host *instance = dev; |
273 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
1da177e4 LT |
274 | int dma_stat; |
275 | ||
276 | /* Turn off DMA and select sector counter register before | |
277 | * accessing the status register (Atari recommendation!) | |
278 | */ | |
279 | st_dma.dma_mode_status = 0x90; | |
280 | dma_stat = st_dma.dma_mode_status; | |
281 | ||
282 | /* Bit 0 indicates some error in the DMA process... don't know | |
283 | * what happened exactly (no further docu). | |
284 | */ | |
285 | if (!(dma_stat & 0x01)) { | |
286 | /* DMA error */ | |
287 | printk(KERN_CRIT "SCSI DMA error near 0x%08lx!\n", SCSI_DMA_GETADR()); | |
288 | } | |
289 | ||
290 | /* If the DMA was active, but now bit 1 is not clear, it is some | |
291 | * other 5380 interrupt that finishes the DMA transfer. We have to | |
292 | * calculate the number of residual bytes and give a warning if | |
293 | * bytes are stuck in the ST-DMA fifo (there's no way to reach them!) | |
294 | */ | |
295 | if (atari_dma_active && (dma_stat & 0x02)) { | |
c28bda25 | 296 | unsigned long transferred; |
1da177e4 LT |
297 | |
298 | transferred = SCSI_DMA_GETADR() - atari_dma_startaddr; | |
299 | /* The ST-DMA address is incremented in 2-byte steps, but the | |
300 | * data are written only in 16-byte chunks. If the number of | |
301 | * transferred bytes is not divisible by 16, the remainder is | |
302 | * lost somewhere in outer space. | |
303 | */ | |
304 | if (transferred & 15) | |
305 | printk(KERN_ERR "SCSI DMA error: %ld bytes lost in " | |
306 | "ST-DMA fifo\n", transferred & 15); | |
307 | ||
cd46140a | 308 | atari_dma_residual = hostdata->dma_len - transferred; |
d65e634a | 309 | dprintk(NDEBUG_DMA, "SCSI DMA: There are %ld residual bytes.\n", |
1da177e4 | 310 | atari_dma_residual); |
c28bda25 | 311 | } else |
1da177e4 LT |
312 | atari_dma_residual = 0; |
313 | atari_dma_active = 0; | |
314 | ||
315 | if (atari_dma_orig_addr) { | |
316 | /* If the dribble buffer was used on a read operation, copy the DMA-ed | |
317 | * data to the original destination address. | |
318 | */ | |
319 | memcpy(atari_dma_orig_addr, phys_to_virt(atari_dma_startaddr), | |
cd46140a | 320 | hostdata->dma_len - atari_dma_residual); |
1da177e4 LT |
321 | atari_dma_orig_addr = NULL; |
322 | } | |
323 | ||
cd46140a FT |
324 | NCR5380_intr(irq, dev); |
325 | ||
1da177e4 LT |
326 | return IRQ_HANDLED; |
327 | } | |
328 | ||
329 | ||
c28bda25 | 330 | static void atari_scsi_fetch_restbytes(void) |
1da177e4 LT |
331 | { |
332 | int nr; | |
333 | char *src, *dst; | |
334 | unsigned long phys_dst; | |
335 | ||
336 | /* fetch rest bytes in the DMA register */ | |
337 | phys_dst = SCSI_DMA_READ_P(dma_addr); | |
338 | nr = phys_dst & 3; | |
339 | if (nr) { | |
340 | /* there are 'nr' bytes left for the last long address | |
341 | before the DMA pointer */ | |
342 | phys_dst ^= nr; | |
d65e634a | 343 | dprintk(NDEBUG_DMA, "SCSI DMA: there are %d rest bytes for phys addr 0x%08lx", |
1da177e4 LT |
344 | nr, phys_dst); |
345 | /* The content of the DMA pointer is a physical address! */ | |
346 | dst = phys_to_virt(phys_dst); | |
d65e634a | 347 | dprintk(NDEBUG_DMA, " = virt addr %p\n", dst); |
1da177e4 LT |
348 | for (src = (char *)&tt_scsi_dma.dma_restdata; nr != 0; --nr) |
349 | *dst++ = *src++; | |
350 | } | |
351 | } | |
1da177e4 LT |
352 | |
353 | ||
1da177e4 | 354 | /* This function releases the lock on the DMA chip if there is no |
16b29e75 | 355 | * connected command and the disconnected queue is empty. |
1da177e4 LT |
356 | */ |
357 | ||
e3c3da67 | 358 | static void falcon_release_lock(void) |
1da177e4 | 359 | { |
c28bda25 RZ |
360 | if (IS_A_TT()) |
361 | return; | |
362 | ||
e3c3da67 | 363 | if (stdma_is_locked_by(scsi_falcon_intr)) |
1da177e4 | 364 | stdma_release(); |
1da177e4 LT |
365 | } |
366 | ||
367 | /* This function manages the locking of the ST-DMA. | |
368 | * If the DMA isn't locked already for SCSI, it tries to lock it by | |
369 | * calling stdma_lock(). But if the DMA is locked by the SCSI code and | |
370 | * there are other drivers waiting for the chip, we do not issue the | |
16b29e75 | 371 | * command immediately but tell the SCSI mid-layer to defer. |
1da177e4 LT |
372 | */ |
373 | ||
a53a21e4 | 374 | static int falcon_get_lock(struct Scsi_Host *instance) |
1da177e4 | 375 | { |
c28bda25 | 376 | if (IS_A_TT()) |
16b29e75 | 377 | return 1; |
1da177e4 | 378 | |
ded155b5 FT |
379 | if (stdma_is_locked_by(scsi_falcon_intr) && |
380 | instance->hostt->can_queue > 1) | |
381 | return 1; | |
382 | ||
16b29e75 | 383 | if (in_interrupt()) |
a53a21e4 | 384 | return stdma_try_lock(scsi_falcon_intr, instance); |
1da177e4 | 385 | |
a53a21e4 | 386 | stdma_lock(scsi_falcon_intr, instance); |
16b29e75 | 387 | return 1; |
1da177e4 LT |
388 | } |
389 | ||
7b54e43a GU |
390 | #ifndef MODULE |
391 | static int __init atari_scsi_setup(char *str) | |
1da177e4 LT |
392 | { |
393 | /* Format of atascsi parameter is: | |
394 | * atascsi=<can_queue>,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags> | |
3ff228af | 395 | * Defaults depend on TT or Falcon, determined at run time. |
1da177e4 LT |
396 | * Negative values mean don't change. |
397 | */ | |
9c3f0e2b | 398 | int ints[8]; |
7b54e43a GU |
399 | |
400 | get_options(str, ARRAY_SIZE(ints), ints); | |
c28bda25 | 401 | |
1da177e4 | 402 | if (ints[0] < 1) { |
c28bda25 | 403 | printk("atari_scsi_setup: no arguments!\n"); |
7b54e43a | 404 | return 0; |
1da177e4 | 405 | } |
3ff228af FT |
406 | if (ints[0] >= 1) |
407 | setup_can_queue = ints[1]; | |
408 | if (ints[0] >= 2) | |
409 | setup_cmd_per_lun = ints[2]; | |
410 | if (ints[0] >= 3) | |
411 | setup_sg_tablesize = ints[3]; | |
412 | if (ints[0] >= 4) | |
413 | setup_hostid = ints[4]; | |
c4ec6f92 | 414 | /* ints[5] (use_tagged_queuing) is ignored */ |
9c3f0e2b FT |
415 | /* ints[6] (use_pdma) is ignored */ |
416 | if (ints[0] >= 7) | |
417 | setup_toshiba_delay = ints[7]; | |
7b54e43a GU |
418 | |
419 | return 1; | |
1da177e4 LT |
420 | } |
421 | ||
7b54e43a GU |
422 | __setup("atascsi=", atari_scsi_setup); |
423 | #endif /* !MODULE */ | |
424 | ||
4a98f896 | 425 | static unsigned long atari_scsi_dma_setup(struct NCR5380_hostdata *hostdata, |
107b5d53 GU |
426 | void *data, unsigned long count, |
427 | int dir) | |
1da177e4 | 428 | { |
c28bda25 | 429 | unsigned long addr = virt_to_phys(data); |
1da177e4 | 430 | |
4a98f896 FT |
431 | dprintk(NDEBUG_DMA, "scsi%d: setting up dma, data = %p, phys = %lx, count = %ld, dir = %d\n", |
432 | hostdata->host->host_no, data, addr, count, dir); | |
1da177e4 LT |
433 | |
434 | if (!IS_A_TT() && !STRAM_ADDR(addr)) { | |
435 | /* If we have a non-DMAable address on a Falcon, use the dribble | |
436 | * buffer; 'orig_addr' != 0 in the read case tells the interrupt | |
437 | * handler to copy data from the dribble buffer to the originally | |
438 | * wanted address. | |
439 | */ | |
440 | if (dir) | |
c28bda25 | 441 | memcpy(atari_dma_buffer, data, count); |
1da177e4 LT |
442 | else |
443 | atari_dma_orig_addr = data; | |
444 | addr = atari_dma_phys_buffer; | |
445 | } | |
c28bda25 | 446 | |
1da177e4 | 447 | atari_dma_startaddr = addr; /* Needed for calculating residual later. */ |
c28bda25 | 448 | |
1da177e4 LT |
449 | /* Cache cleanup stuff: On writes, push any dirty cache out before sending |
450 | * it to the peripheral. (Must be done before DMA setup, since at least | |
451 | * the ST-DMA begins to fill internal buffers right after setup. For | |
452 | * reads, invalidate any cache, may be altered after DMA without CPU | |
453 | * knowledge. | |
c28bda25 | 454 | * |
1da177e4 LT |
455 | * ++roman: For the Medusa, there's no need at all for that cache stuff, |
456 | * because the hardware does bus snooping (fine!). | |
457 | */ | |
c28bda25 | 458 | dma_cache_maintenance(addr, count, dir); |
1da177e4 | 459 | |
1da177e4 LT |
460 | if (IS_A_TT()) { |
461 | tt_scsi_dma.dma_ctrl = dir; | |
c28bda25 RZ |
462 | SCSI_DMA_WRITE_P(dma_addr, addr); |
463 | SCSI_DMA_WRITE_P(dma_cnt, count); | |
1da177e4 | 464 | tt_scsi_dma.dma_ctrl = dir | 2; |
c28bda25 RZ |
465 | } else { /* ! IS_A_TT */ |
466 | ||
1da177e4 | 467 | /* set address */ |
c28bda25 | 468 | SCSI_DMA_SETADR(addr); |
1da177e4 LT |
469 | |
470 | /* toggle direction bit to clear FIFO and set DMA direction */ | |
471 | dir <<= 8; | |
472 | st_dma.dma_mode_status = 0x90 | dir; | |
473 | st_dma.dma_mode_status = 0x90 | (dir ^ 0x100); | |
474 | st_dma.dma_mode_status = 0x90 | dir; | |
475 | udelay(40); | |
476 | /* On writes, round up the transfer length to the next multiple of 512 | |
477 | * (see also comment at atari_dma_xfer_len()). */ | |
478 | st_dma.fdc_acces_seccount = (count + (dir ? 511 : 0)) >> 9; | |
479 | udelay(40); | |
480 | st_dma.dma_mode_status = 0x10 | dir; | |
481 | udelay(40); | |
482 | /* need not restore value of dir, only boolean value is tested */ | |
483 | atari_dma_active = 1; | |
484 | } | |
485 | ||
c28bda25 | 486 | return count; |
1da177e4 LT |
487 | } |
488 | ||
4a98f896 FT |
489 | static inline int atari_scsi_dma_recv_setup(struct NCR5380_hostdata *hostdata, |
490 | unsigned char *data, int count) | |
491 | { | |
492 | return atari_scsi_dma_setup(hostdata, data, count, 0); | |
493 | } | |
494 | ||
495 | static inline int atari_scsi_dma_send_setup(struct NCR5380_hostdata *hostdata, | |
496 | unsigned char *data, int count) | |
497 | { | |
498 | return atari_scsi_dma_setup(hostdata, data, count, 1); | |
499 | } | |
1da177e4 | 500 | |
4a98f896 | 501 | static int atari_scsi_dma_residual(struct NCR5380_hostdata *hostdata) |
1da177e4 | 502 | { |
c28bda25 | 503 | return atari_dma_residual; |
1da177e4 LT |
504 | } |
505 | ||
506 | ||
507 | #define CMD_SURELY_BLOCK_MODE 0 | |
508 | #define CMD_SURELY_BYTE_MODE 1 | |
509 | #define CMD_MODE_UNKNOWN 2 | |
510 | ||
710ddd0d | 511 | static int falcon_classify_cmd(struct scsi_cmnd *cmd) |
1da177e4 LT |
512 | { |
513 | unsigned char opcode = cmd->cmnd[0]; | |
c28bda25 | 514 | |
1da177e4 | 515 | if (opcode == READ_DEFECT_DATA || opcode == READ_LONG || |
c28bda25 RZ |
516 | opcode == READ_BUFFER) |
517 | return CMD_SURELY_BYTE_MODE; | |
1da177e4 LT |
518 | else if (opcode == READ_6 || opcode == READ_10 || |
519 | opcode == 0xa8 /* READ_12 */ || opcode == READ_REVERSE || | |
520 | opcode == RECOVER_BUFFERED_DATA) { | |
521 | /* In case of a sequential-access target (tape), special care is | |
522 | * needed here: The transfer is block-mode only if the 'fixed' bit is | |
523 | * set! */ | |
524 | if (cmd->device->type == TYPE_TAPE && !(cmd->cmnd[1] & 1)) | |
c28bda25 | 525 | return CMD_SURELY_BYTE_MODE; |
1da177e4 | 526 | else |
c28bda25 RZ |
527 | return CMD_SURELY_BLOCK_MODE; |
528 | } else | |
529 | return CMD_MODE_UNKNOWN; | |
1da177e4 LT |
530 | } |
531 | ||
532 | ||
533 | /* This function calculates the number of bytes that can be transferred via | |
534 | * DMA. On the TT, this is arbitrary, but on the Falcon we have to use the | |
535 | * ST-DMA chip. There are only multiples of 512 bytes possible and max. | |
536 | * 255*512 bytes :-( This means also, that defining READ_OVERRUNS is not | |
537 | * possible on the Falcon, since that would require to program the DMA for | |
538 | * n*512 - atari_read_overrun bytes. But it seems that the Falcon doesn't have | |
539 | * the overrun problem, so this question is academic :-) | |
540 | */ | |
541 | ||
4a98f896 FT |
542 | static int atari_scsi_dma_xfer_len(struct NCR5380_hostdata *hostdata, |
543 | struct scsi_cmnd *cmd) | |
1da177e4 | 544 | { |
4a98f896 FT |
545 | int wanted_len = cmd->SCp.this_residual; |
546 | int possible_len, limit; | |
29c8a246 | 547 | |
e63449c4 FT |
548 | if (wanted_len < DMA_MIN_SIZE) |
549 | return 0; | |
550 | ||
1da177e4 LT |
551 | if (IS_A_TT()) |
552 | /* TT SCSI DMA can transfer arbitrary #bytes */ | |
c28bda25 | 553 | return wanted_len; |
1da177e4 LT |
554 | |
555 | /* ST DMA chip is stupid -- only multiples of 512 bytes! (and max. | |
556 | * 255*512 bytes, but this should be enough) | |
557 | * | |
558 | * ++roman: Aaargl! Another Falcon-SCSI problem... There are some commands | |
559 | * that return a number of bytes which cannot be known beforehand. In this | |
560 | * case, the given transfer length is an "allocation length". Now it | |
561 | * can happen that this allocation length is a multiple of 512 bytes and | |
562 | * the DMA is used. But if not n*512 bytes really arrive, some input data | |
563 | * will be lost in the ST-DMA's FIFO :-( Thus, we have to distinguish | |
564 | * between commands that do block transfers and those that do byte | |
565 | * transfers. But this isn't easy... there are lots of vendor specific | |
566 | * commands, and the user can issue any command via the | |
567 | * SCSI_IOCTL_SEND_COMMAND. | |
568 | * | |
569 | * The solution: We classify SCSI commands in 1) surely block-mode cmd.s, | |
570 | * 2) surely byte-mode cmd.s and 3) cmd.s with unknown mode. In case 1) | |
571 | * and 3), the thing to do is obvious: allow any number of blocks via DMA | |
572 | * or none. In case 2), we apply some heuristic: Byte mode is assumed if | |
573 | * the transfer (allocation) length is < 1024, hoping that no cmd. not | |
574 | * explicitly known as byte mode have such big allocation lengths... | |
575 | * BTW, all the discussion above applies only to reads. DMA writes are | |
576 | * unproblematic anyways, since the targets aborts the transfer after | |
577 | * receiving a sufficient number of bytes. | |
578 | * | |
579 | * Another point: If the transfer is from/to an non-ST-RAM address, we | |
580 | * use the dribble buffer and thus can do only STRAM_BUFFER_SIZE bytes. | |
581 | */ | |
582 | ||
4a98f896 | 583 | if (cmd->sc_data_direction == DMA_TO_DEVICE) { |
1da177e4 LT |
584 | /* Write operation can always use the DMA, but the transfer size must |
585 | * be rounded up to the next multiple of 512 (atari_dma_setup() does | |
586 | * this). | |
587 | */ | |
588 | possible_len = wanted_len; | |
c28bda25 | 589 | } else { |
1da177e4 LT |
590 | /* Read operations: if the wanted transfer length is not a multiple of |
591 | * 512, we cannot use DMA, since the ST-DMA cannot split transfers | |
592 | * (no interrupt on DMA finished!) | |
593 | */ | |
594 | if (wanted_len & 0x1ff) | |
595 | possible_len = 0; | |
596 | else { | |
597 | /* Now classify the command (see above) and decide whether it is | |
598 | * allowed to do DMA at all */ | |
c28bda25 RZ |
599 | switch (falcon_classify_cmd(cmd)) { |
600 | case CMD_SURELY_BLOCK_MODE: | |
1da177e4 LT |
601 | possible_len = wanted_len; |
602 | break; | |
c28bda25 | 603 | case CMD_SURELY_BYTE_MODE: |
1da177e4 LT |
604 | possible_len = 0; /* DMA prohibited */ |
605 | break; | |
c28bda25 RZ |
606 | case CMD_MODE_UNKNOWN: |
607 | default: | |
1da177e4 LT |
608 | /* For unknown commands assume block transfers if the transfer |
609 | * size/allocation length is >= 1024 */ | |
610 | possible_len = (wanted_len < 1024) ? 0 : wanted_len; | |
611 | break; | |
612 | } | |
613 | } | |
614 | } | |
c28bda25 | 615 | |
1da177e4 | 616 | /* Last step: apply the hard limit on DMA transfers */ |
c28bda25 | 617 | limit = (atari_dma_buffer && !STRAM_ADDR(virt_to_phys(cmd->SCp.ptr))) ? |
1da177e4 LT |
618 | STRAM_BUFFER_SIZE : 255*512; |
619 | if (possible_len > limit) | |
620 | possible_len = limit; | |
621 | ||
622 | if (possible_len != wanted_len) | |
4a98f896 FT |
623 | dprintk(NDEBUG_DMA, "DMA transfer now %d bytes instead of %d\n", |
624 | possible_len, wanted_len); | |
1da177e4 | 625 | |
c28bda25 | 626 | return possible_len; |
1da177e4 LT |
627 | } |
628 | ||
629 | ||
1da177e4 LT |
630 | /* NCR5380 register access functions |
631 | * | |
632 | * There are separate functions for TT and Falcon, because the access | |
633 | * methods are quite different. The calling macros NCR5380_read and | |
634 | * NCR5380_write call these functions via function pointers. | |
635 | */ | |
636 | ||
61e1ce58 | 637 | static u8 atari_scsi_tt_reg_read(unsigned int reg) |
1da177e4 | 638 | { |
c28bda25 | 639 | return tt_scsi_regp[reg * 2]; |
1da177e4 LT |
640 | } |
641 | ||
61e1ce58 | 642 | static void atari_scsi_tt_reg_write(unsigned int reg, u8 value) |
1da177e4 LT |
643 | { |
644 | tt_scsi_regp[reg * 2] = value; | |
645 | } | |
646 | ||
61e1ce58 | 647 | static u8 atari_scsi_falcon_reg_read(unsigned int reg) |
1da177e4 | 648 | { |
abd12b09 | 649 | unsigned long flags; |
61e1ce58 | 650 | u8 result; |
abd12b09 FT |
651 | |
652 | reg += 0x88; | |
653 | local_irq_save(flags); | |
654 | dma_wd.dma_mode_status = (u_short)reg; | |
61e1ce58 | 655 | result = (u8)dma_wd.fdc_acces_seccount; |
abd12b09 FT |
656 | local_irq_restore(flags); |
657 | return result; | |
1da177e4 LT |
658 | } |
659 | ||
61e1ce58 | 660 | static void atari_scsi_falcon_reg_write(unsigned int reg, u8 value) |
1da177e4 | 661 | { |
abd12b09 FT |
662 | unsigned long flags; |
663 | ||
664 | reg += 0x88; | |
665 | local_irq_save(flags); | |
666 | dma_wd.dma_mode_status = (u_short)reg; | |
1da177e4 | 667 | dma_wd.fdc_acces_seccount = (u_short)value; |
abd12b09 | 668 | local_irq_restore(flags); |
1da177e4 LT |
669 | } |
670 | ||
671 | ||
52d3e561 | 672 | #include "NCR5380.c" |
1da177e4 | 673 | |
12e5fc66 | 674 | static int atari_scsi_host_reset(struct scsi_cmnd *cmd) |
4d3d2a54 FT |
675 | { |
676 | int rv; | |
e3c3da67 FT |
677 | unsigned long flags; |
678 | ||
679 | local_irq_save(flags); | |
4d3d2a54 | 680 | |
e3c3da67 FT |
681 | /* Abort a maybe active DMA transfer */ |
682 | if (IS_A_TT()) { | |
4d3d2a54 | 683 | tt_scsi_dma.dma_ctrl = 0; |
4d3d2a54 | 684 | } else { |
546a4d18 FT |
685 | if (stdma_is_locked_by(scsi_falcon_intr)) |
686 | st_dma.dma_mode_status = 0x90; | |
4d3d2a54 FT |
687 | atari_dma_active = 0; |
688 | atari_dma_orig_addr = NULL; | |
4d3d2a54 FT |
689 | } |
690 | ||
12e5fc66 | 691 | rv = NCR5380_host_reset(cmd); |
4d3d2a54 | 692 | |
e3c3da67 FT |
693 | /* The 5380 raises its IRQ line while _RST is active but the ST DMA |
694 | * "lock" has been released so this interrupt may end up handled by | |
695 | * floppy or IDE driver (if one of them holds the lock). The NCR5380 | |
696 | * interrupt flag has been cleared already. | |
697 | */ | |
4d3d2a54 | 698 | |
e3c3da67 | 699 | local_irq_restore(flags); |
4d3d2a54 FT |
700 | |
701 | return rv; | |
702 | } | |
703 | ||
3ff228af FT |
704 | #define DRV_MODULE_NAME "atari_scsi" |
705 | #define PFX DRV_MODULE_NAME ": " | |
706 | ||
707 | static struct scsi_host_template atari_scsi_template = { | |
708 | .module = THIS_MODULE, | |
709 | .proc_name = DRV_MODULE_NAME, | |
1da177e4 | 710 | .name = "Atari native SCSI", |
1da177e4 LT |
711 | .info = atari_scsi_info, |
712 | .queuecommand = atari_scsi_queue_command, | |
713 | .eh_abort_handler = atari_scsi_abort, | |
12e5fc66 | 714 | .eh_host_reset_handler = atari_scsi_host_reset, |
3ff228af | 715 | .this_id = 7, |
a5217a86 | 716 | .cmd_per_lun = 2, |
4af14d11 | 717 | .dma_boundary = PAGE_SIZE - 1, |
32b26a10 | 718 | .cmd_size = NCR5380_CMD_SIZE, |
1da177e4 LT |
719 | }; |
720 | ||
3ff228af FT |
721 | static int __init atari_scsi_probe(struct platform_device *pdev) |
722 | { | |
723 | struct Scsi_Host *instance; | |
724 | int error; | |
725 | struct resource *irq; | |
ef1081cb | 726 | int host_flags = 0; |
3ff228af FT |
727 | |
728 | irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0); | |
729 | if (!irq) | |
730 | return -ENODEV; | |
731 | ||
732 | if (ATARIHW_PRESENT(TT_SCSI)) { | |
733 | atari_scsi_reg_read = atari_scsi_tt_reg_read; | |
734 | atari_scsi_reg_write = atari_scsi_tt_reg_write; | |
735 | } else { | |
736 | atari_scsi_reg_read = atari_scsi_falcon_reg_read; | |
737 | atari_scsi_reg_write = atari_scsi_falcon_reg_write; | |
738 | } | |
739 | ||
3ff228af FT |
740 | if (ATARIHW_PRESENT(TT_SCSI)) { |
741 | atari_scsi_template.can_queue = 16; | |
3ff228af FT |
742 | atari_scsi_template.sg_tablesize = SG_ALL; |
743 | } else { | |
ded155b5 | 744 | atari_scsi_template.can_queue = 1; |
3ff228af FT |
745 | atari_scsi_template.sg_tablesize = SG_NONE; |
746 | } | |
747 | ||
748 | if (setup_can_queue > 0) | |
749 | atari_scsi_template.can_queue = setup_can_queue; | |
750 | ||
751 | if (setup_cmd_per_lun > 0) | |
752 | atari_scsi_template.cmd_per_lun = setup_cmd_per_lun; | |
753 | ||
754 | /* Leave sg_tablesize at 0 on a Falcon! */ | |
755 | if (ATARIHW_PRESENT(TT_SCSI) && setup_sg_tablesize >= 0) | |
756 | atari_scsi_template.sg_tablesize = setup_sg_tablesize; | |
757 | ||
758 | if (setup_hostid >= 0) { | |
759 | atari_scsi_template.this_id = setup_hostid & 7; | |
83d2aed4 | 760 | } else if (IS_REACHABLE(CONFIG_NVRAM)) { |
3ff228af FT |
761 | /* Test if a host id is set in the NVRam */ |
762 | if (ATARIHW_PRESENT(TT_CLK) && nvram_check_checksum()) { | |
6225a16a | 763 | unsigned char b = nvram_read_byte(16); |
3ff228af FT |
764 | |
765 | /* Arbitration enabled? (for TOS) | |
766 | * If yes, use configured host ID | |
767 | */ | |
768 | if (b & 0x80) | |
769 | atari_scsi_template.this_id = b & 7; | |
770 | } | |
771 | } | |
772 | ||
3ff228af FT |
773 | /* If running on a Falcon and if there's TT-Ram (i.e., more than one |
774 | * memory block, since there's always ST-Ram in a Falcon), then | |
775 | * allocate a STRAM_BUFFER_SIZE byte dribble buffer for transfers | |
776 | * from/to alternative Ram. | |
777 | */ | |
778 | if (ATARIHW_PRESENT(ST_SCSI) && !ATARIHW_PRESENT(EXTD_DMA) && | |
6ff8a3b2 | 779 | m68k_realnum_memory > 1) { |
3ff228af FT |
780 | atari_dma_buffer = atari_stram_alloc(STRAM_BUFFER_SIZE, "SCSI"); |
781 | if (!atari_dma_buffer) { | |
782 | pr_err(PFX "can't allocate ST-RAM double buffer\n"); | |
783 | return -ENOMEM; | |
784 | } | |
785 | atari_dma_phys_buffer = atari_stram_to_phys(atari_dma_buffer); | |
4ab2a787 | 786 | atari_dma_orig_addr = NULL; |
3ff228af | 787 | } |
3ff228af FT |
788 | |
789 | instance = scsi_host_alloc(&atari_scsi_template, | |
790 | sizeof(struct NCR5380_hostdata)); | |
791 | if (!instance) { | |
792 | error = -ENOMEM; | |
793 | goto fail_alloc; | |
794 | } | |
3ff228af | 795 | |
3ff228af FT |
796 | instance->irq = irq->start; |
797 | ||
ef1081cb | 798 | host_flags |= IS_A_TT() ? 0 : FLAG_LATE_DMA_SETUP; |
9c3f0e2b | 799 | host_flags |= setup_toshiba_delay > 0 ? FLAG_TOSHIBA_DELAY : 0; |
ca513fc9 | 800 | |
0ad0eff9 FT |
801 | error = NCR5380_init(instance, host_flags); |
802 | if (error) | |
803 | goto fail_init; | |
3ff228af FT |
804 | |
805 | if (IS_A_TT()) { | |
806 | error = request_irq(instance->irq, scsi_tt_intr, 0, | |
807 | "NCR5380", instance); | |
808 | if (error) { | |
809 | pr_err(PFX "request irq %d failed, aborting\n", | |
810 | instance->irq); | |
811 | goto fail_irq; | |
812 | } | |
813 | tt_mfp.active_edge |= 0x80; /* SCSI int on L->H */ | |
e4dec680 | 814 | |
3ff228af FT |
815 | tt_scsi_dma.dma_ctrl = 0; |
816 | atari_dma_residual = 0; | |
817 | ||
818 | /* While the read overruns (described by Drew Eckhardt in | |
819 | * NCR5380.c) never happened on TTs, they do in fact on the | |
820 | * Medusa (This was the cause why SCSI didn't work right for | |
821 | * so long there.) Since handling the overruns slows down | |
822 | * a bit, I turned the #ifdef's into a runtime condition. | |
823 | * | |
824 | * In principle it should be sufficient to do max. 1 byte with | |
825 | * PIO, but there is another problem on the Medusa with the DMA | |
ef1081cb | 826 | * rest data register. So read_overruns is currently set |
3ff228af FT |
827 | * to 4 to avoid having transfers that aren't a multiple of 4. |
828 | * If the rest data bug is fixed, this can be lowered to 1. | |
829 | */ | |
ef1081cb FT |
830 | if (MACH_IS_MEDUSA) { |
831 | struct NCR5380_hostdata *hostdata = | |
832 | shost_priv(instance); | |
833 | ||
834 | hostdata->read_overruns = 4; | |
835 | } | |
3ff228af FT |
836 | } else { |
837 | /* Nothing to do for the interrupt: the ST-DMA is initialized | |
838 | * already. | |
839 | */ | |
3ff228af FT |
840 | atari_dma_residual = 0; |
841 | atari_dma_active = 0; | |
842 | atari_dma_stram_mask = (ATARIHW_PRESENT(EXTD_DMA) ? 0x00000000 | |
843 | : 0xff000000); | |
3ff228af FT |
844 | } |
845 | ||
9c3f0e2b FT |
846 | NCR5380_maybe_reset_bus(instance); |
847 | ||
3ff228af FT |
848 | error = scsi_add_host(instance, NULL); |
849 | if (error) | |
850 | goto fail_host; | |
851 | ||
852 | platform_set_drvdata(pdev, instance); | |
853 | ||
854 | scsi_scan_host(instance); | |
855 | return 0; | |
856 | ||
857 | fail_host: | |
858 | if (IS_A_TT()) | |
859 | free_irq(instance->irq, instance); | |
860 | fail_irq: | |
861 | NCR5380_exit(instance); | |
0ad0eff9 | 862 | fail_init: |
3ff228af FT |
863 | scsi_host_put(instance); |
864 | fail_alloc: | |
865 | if (atari_dma_buffer) | |
866 | atari_stram_free(atari_dma_buffer); | |
867 | return error; | |
868 | } | |
869 | ||
870 | static int __exit atari_scsi_remove(struct platform_device *pdev) | |
871 | { | |
872 | struct Scsi_Host *instance = platform_get_drvdata(pdev); | |
873 | ||
874 | scsi_remove_host(instance); | |
875 | if (IS_A_TT()) | |
876 | free_irq(instance->irq, instance); | |
877 | NCR5380_exit(instance); | |
878 | scsi_host_put(instance); | |
879 | if (atari_dma_buffer) | |
880 | atari_stram_free(atari_dma_buffer); | |
881 | return 0; | |
882 | } | |
883 | ||
884 | static struct platform_driver atari_scsi_driver = { | |
885 | .remove = __exit_p(atari_scsi_remove), | |
886 | .driver = { | |
887 | .name = DRV_MODULE_NAME, | |
3ff228af FT |
888 | }, |
889 | }; | |
1da177e4 | 890 | |
3ff228af | 891 | module_platform_driver_probe(atari_scsi_driver, atari_scsi_probe); |
1da177e4 | 892 | |
3ff228af | 893 | MODULE_ALIAS("platform:" DRV_MODULE_NAME); |
1da177e4 | 894 | MODULE_LICENSE("GPL"); |