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Merge remote-tracking branch 'remotes/armbru/tags/pull-build-2019-07-02-v2' into...
[qemu/ar7.git] / hw / dma / etraxfs_dma.c
blob85783eb847ee9d50bf57b87a395b5e6c580572d5
1 /*
2 * QEMU ETRAX DMA Controller.
3 *
4 * Copyright (c) 2008 Edgar E. Iglesias, Axis Communications AB.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 */
24 #include "qemu/osdep.h"
25 #include "hw/hw.h"
26 #include "exec/address-spaces.h"
27 #include "sysemu/sysemu.h"
28
29 #include "hw/cris/etraxfs_dma.h"
30
31 #define D(x)
32
33 #define RW_DATA (0x0 / 4)
34 #define RW_SAVED_DATA (0x58 / 4)
35 #define RW_SAVED_DATA_BUF (0x5c / 4)
36 #define RW_GROUP (0x60 / 4)
37 #define RW_GROUP_DOWN (0x7c / 4)
38 #define RW_CMD (0x80 / 4)
39 #define RW_CFG (0x84 / 4)
40 #define RW_STAT (0x88 / 4)
41 #define RW_INTR_MASK (0x8c / 4)
42 #define RW_ACK_INTR (0x90 / 4)
43 #define R_INTR (0x94 / 4)
44 #define R_MASKED_INTR (0x98 / 4)
45 #define RW_STREAM_CMD (0x9c / 4)
46
47 #define DMA_REG_MAX (0x100 / 4)
48
49 /* descriptors */
50
51 // ------------------------------------------------------------ dma_descr_group
52 typedef struct dma_descr_group {
53 uint32_t next;
54 unsigned eol : 1;
55 unsigned tol : 1;
56 unsigned bol : 1;
57 unsigned : 1;
58 unsigned intr : 1;
59 unsigned : 2;
60 unsigned en : 1;
61 unsigned : 7;
62 unsigned dis : 1;
63 unsigned md : 16;
64 struct dma_descr_group *up;
65 union {
66 struct dma_descr_context *context;
67 struct dma_descr_group *group;
68 } down;
69 } dma_descr_group;
70
71 // ---------------------------------------------------------- dma_descr_context
72 typedef struct dma_descr_context {
73 uint32_t next;
74 unsigned eol : 1;
75 unsigned : 3;
76 unsigned intr : 1;
77 unsigned : 1;
78 unsigned store_mode : 1;
79 unsigned en : 1;
80 unsigned : 7;
81 unsigned dis : 1;
82 unsigned md0 : 16;
83 unsigned md1;
84 unsigned md2;
85 unsigned md3;
86 unsigned md4;
87 uint32_t saved_data;
88 uint32_t saved_data_buf;
89 } dma_descr_context;
90
91 // ------------------------------------------------------------- dma_descr_data
92 typedef struct dma_descr_data {
93 uint32_t next;
94 uint32_t buf;
95 unsigned eol : 1;
96 unsigned : 2;
97 unsigned out_eop : 1;
98 unsigned intr : 1;
99 unsigned wait : 1;
100 unsigned : 2;
101 unsigned : 3;
102 unsigned in_eop : 1;
103 unsigned : 4;
104 unsigned md : 16;
105 uint32_t after;
106 } dma_descr_data;
107
108 /* Constants */
109 enum {
110 regk_dma_ack_pkt = 0x00000100,
111 regk_dma_anytime = 0x00000001,
112 regk_dma_array = 0x00000008,
113 regk_dma_burst = 0x00000020,
114 regk_dma_client = 0x00000002,
115 regk_dma_copy_next = 0x00000010,
116 regk_dma_copy_up = 0x00000020,
117 regk_dma_data_at_eol = 0x00000001,
118 regk_dma_dis_c = 0x00000010,
119 regk_dma_dis_g = 0x00000020,
120 regk_dma_idle = 0x00000001,
121 regk_dma_intern = 0x00000004,
122 regk_dma_load_c = 0x00000200,
123 regk_dma_load_c_n = 0x00000280,
124 regk_dma_load_c_next = 0x00000240,
125 regk_dma_load_d = 0x00000140,
126 regk_dma_load_g = 0x00000300,
127 regk_dma_load_g_down = 0x000003c0,
128 regk_dma_load_g_next = 0x00000340,
129 regk_dma_load_g_up = 0x00000380,
130 regk_dma_next_en = 0x00000010,
131 regk_dma_next_pkt = 0x00000010,
132 regk_dma_no = 0x00000000,
133 regk_dma_only_at_wait = 0x00000000,
134 regk_dma_restore = 0x00000020,
135 regk_dma_rst = 0x00000001,
136 regk_dma_running = 0x00000004,
137 regk_dma_rw_cfg_default = 0x00000000,
138 regk_dma_rw_cmd_default = 0x00000000,
139 regk_dma_rw_intr_mask_default = 0x00000000,
140 regk_dma_rw_stat_default = 0x00000101,
141 regk_dma_rw_stream_cmd_default = 0x00000000,
142 regk_dma_save_down = 0x00000020,
143 regk_dma_save_up = 0x00000020,
144 regk_dma_set_reg = 0x00000050,
145 regk_dma_set_w_size1 = 0x00000190,
146 regk_dma_set_w_size2 = 0x000001a0,
147 regk_dma_set_w_size4 = 0x000001c0,
148 regk_dma_stopped = 0x00000002,
149 regk_dma_store_c = 0x00000002,
150 regk_dma_store_descr = 0x00000000,
151 regk_dma_store_g = 0x00000004,
152 regk_dma_store_md = 0x00000001,
153 regk_dma_sw = 0x00000008,
154 regk_dma_update_down = 0x00000020,
155 regk_dma_yes = 0x00000001
156 };
157
158 enum dma_ch_state
159 {
160 RST = 1,
161 STOPPED = 2,
162 RUNNING = 4
163 };
164
165 struct fs_dma_channel
166 {
167 qemu_irq irq;
168 struct etraxfs_dma_client *client;
169
170 /* Internal status. */
171 int stream_cmd_src;
172 enum dma_ch_state state;
173
174 unsigned int input : 1;
175 unsigned int eol : 1;
176
177 struct dma_descr_group current_g;
178 struct dma_descr_context current_c;
179 struct dma_descr_data current_d;
180
181 /* Control registers. */
182 uint32_t regs[DMA_REG_MAX];
183 };
184
185 struct fs_dma_ctrl
186 {
187 MemoryRegion mmio;
188 int nr_channels;
189 struct fs_dma_channel *channels;
190
191 QEMUBH *bh;
192 };
193
194 static void DMA_run(void *opaque);
195 static int channel_out_run(struct fs_dma_ctrl *ctrl, int c);
196
197 static inline uint32_t channel_reg(struct fs_dma_ctrl *ctrl, int c, int reg)
198 {
199 return ctrl->channels[c].regs[reg];
200 }
201
202 static inline int channel_stopped(struct fs_dma_ctrl *ctrl, int c)
203 {
204 return channel_reg(ctrl, c, RW_CFG) & 2;
205 }
206
207 static inline int channel_en(struct fs_dma_ctrl *ctrl, int c)
208 {
209 return (channel_reg(ctrl, c, RW_CFG) & 1)
210 && ctrl->channels[c].client;
211 }
212
213 static inline int fs_channel(hwaddr addr)
214 {
215 /* Every channel has a 0x2000 ctrl register map. */
216 return addr >> 13;
217 }
218
219 #ifdef USE_THIS_DEAD_CODE
220 static void channel_load_g(struct fs_dma_ctrl *ctrl, int c)
221 {
222 hwaddr addr = channel_reg(ctrl, c, RW_GROUP);
223
224 /* Load and decode. FIXME: handle endianness. */
225 cpu_physical_memory_read (addr,
226 (void *) &ctrl->channels[c].current_g,
227 sizeof ctrl->channels[c].current_g);
228 }
229
230 static void dump_c(int ch, struct dma_descr_context *c)
231 {
232 printf("%s ch=%d\n", __func__, ch);
233 printf("next=%x\n", c->next);
234 printf("saved_data=%x\n", c->saved_data);
235 printf("saved_data_buf=%x\n", c->saved_data_buf);
236 printf("eol=%x\n", (uint32_t) c->eol);
237 }
238
239 static void dump_d(int ch, struct dma_descr_data *d)
240 {
241 printf("%s ch=%d\n", __func__, ch);
242 printf("next=%x\n", d->next);
243 printf("buf=%x\n", d->buf);
244 printf("after=%x\n", d->after);
245 printf("intr=%x\n", (uint32_t) d->intr);
246 printf("out_eop=%x\n", (uint32_t) d->out_eop);
247 printf("in_eop=%x\n", (uint32_t) d->in_eop);
248 printf("eol=%x\n", (uint32_t) d->eol);
249 }
250 #endif
251
252 static void channel_load_c(struct fs_dma_ctrl *ctrl, int c)
253 {
254 hwaddr addr = channel_reg(ctrl, c, RW_GROUP_DOWN);
255
256 /* Load and decode. FIXME: handle endianness. */
257 cpu_physical_memory_read (addr,
258 (void *) &ctrl->channels[c].current_c,
259 sizeof ctrl->channels[c].current_c);
260
261 D(dump_c(c, &ctrl->channels[c].current_c));
262 /* I guess this should update the current pos. */
263 ctrl->channels[c].regs[RW_SAVED_DATA] =
264 (uint32_t)(unsigned long)ctrl->channels[c].current_c.saved_data;
265 ctrl->channels[c].regs[RW_SAVED_DATA_BUF] =
266 (uint32_t)(unsigned long)ctrl->channels[c].current_c.saved_data_buf;
267 }
268
269 static void channel_load_d(struct fs_dma_ctrl *ctrl, int c)
270 {
271 hwaddr addr = channel_reg(ctrl, c, RW_SAVED_DATA);
272
273 /* Load and decode. FIXME: handle endianness. */
274 D(printf("%s ch=%d addr=" TARGET_FMT_plx "\n", __func__, c, addr));
275 cpu_physical_memory_read (addr,
276 (void *) &ctrl->channels[c].current_d,
277 sizeof ctrl->channels[c].current_d);
278
279 D(dump_d(c, &ctrl->channels[c].current_d));
280 ctrl->channels[c].regs[RW_DATA] = addr;
281 }
282
283 static void channel_store_c(struct fs_dma_ctrl *ctrl, int c)
284 {
285 hwaddr addr = channel_reg(ctrl, c, RW_GROUP_DOWN);
286
287 /* Encode and store. FIXME: handle endianness. */
288 D(printf("%s ch=%d addr=" TARGET_FMT_plx "\n", __func__, c, addr));
289 D(dump_d(c, &ctrl->channels[c].current_d));
290 cpu_physical_memory_write (addr,
291 (void *) &ctrl->channels[c].current_c,
292 sizeof ctrl->channels[c].current_c);
293 }
294
295 static void channel_store_d(struct fs_dma_ctrl *ctrl, int c)
296 {
297 hwaddr addr = channel_reg(ctrl, c, RW_SAVED_DATA);
298
299 /* Encode and store. FIXME: handle endianness. */
300 D(printf("%s ch=%d addr=" TARGET_FMT_plx "\n", __func__, c, addr));
301 cpu_physical_memory_write (addr,
302 (void *) &ctrl->channels[c].current_d,
303 sizeof ctrl->channels[c].current_d);
304 }
305
306 static inline void channel_stop(struct fs_dma_ctrl *ctrl, int c)
307 {
308 /* FIXME: */
309 }
310
311 static inline void channel_start(struct fs_dma_ctrl *ctrl, int c)
312 {
313 if (ctrl->channels[c].client)
314 {
315 ctrl->channels[c].eol = 0;
316 ctrl->channels[c].state = RUNNING;
317 if (!ctrl->channels[c].input)
318 channel_out_run(ctrl, c);
319 } else
320 printf("WARNING: starting DMA ch %d with no client\n", c);
321
322 qemu_bh_schedule_idle(ctrl->bh);
323 }
324
325 static void channel_continue(struct fs_dma_ctrl *ctrl, int c)
326 {
327 if (!channel_en(ctrl, c)
328 || channel_stopped(ctrl, c)
329 || ctrl->channels[c].state != RUNNING
330 /* Only reload the current data descriptor if it has eol set. */
331 || !ctrl->channels[c].current_d.eol) {
332 D(printf("continue failed ch=%d state=%d stopped=%d en=%d eol=%d\n",
333 c, ctrl->channels[c].state,
334 channel_stopped(ctrl, c),
335 channel_en(ctrl,c),
336 ctrl->channels[c].eol));
337 D(dump_d(c, &ctrl->channels[c].current_d));
338 return;
339 }
340
341 /* Reload the current descriptor. */
342 channel_load_d(ctrl, c);
343
344 /* If the current descriptor cleared the eol flag and we had already
345 reached eol state, do the continue. */
346 if (!ctrl->channels[c].current_d.eol && ctrl->channels[c].eol) {
347 D(printf("continue %d ok %x\n", c,
348 ctrl->channels[c].current_d.next));
349 ctrl->channels[c].regs[RW_SAVED_DATA] =
350 (uint32_t)(unsigned long)ctrl->channels[c].current_d.next;
351 channel_load_d(ctrl, c);
352 ctrl->channels[c].regs[RW_SAVED_DATA_BUF] =
353 (uint32_t)(unsigned long)ctrl->channels[c].current_d.buf;
354
355 channel_start(ctrl, c);
356 }
357 ctrl->channels[c].regs[RW_SAVED_DATA_BUF] =
358 (uint32_t)(unsigned long)ctrl->channels[c].current_d.buf;
359 }
360
361 static void channel_stream_cmd(struct fs_dma_ctrl *ctrl, int c, uint32_t v)
362 {
363 unsigned int cmd = v & ((1 << 10) - 1);
364
365 D(printf("%s ch=%d cmd=%x\n",
366 __func__, c, cmd));
367 if (cmd & regk_dma_load_d) {
368 channel_load_d(ctrl, c);
369 if (cmd & regk_dma_burst)
370 channel_start(ctrl, c);
371 }
372
373 if (cmd & regk_dma_load_c) {
374 channel_load_c(ctrl, c);
375 }
376 }
377
378 static void channel_update_irq(struct fs_dma_ctrl *ctrl, int c)
379 {
380 D(printf("%s %d\n", __func__, c));
381 ctrl->channels[c].regs[R_INTR] &=
382 ~(ctrl->channels[c].regs[RW_ACK_INTR]);
383
384 ctrl->channels[c].regs[R_MASKED_INTR] =
385 ctrl->channels[c].regs[R_INTR]
386 & ctrl->channels[c].regs[RW_INTR_MASK];
387
388 D(printf("%s: chan=%d masked_intr=%x\n", __func__,
389 c,
390 ctrl->channels[c].regs[R_MASKED_INTR]));
391
392 qemu_set_irq(ctrl->channels[c].irq,
393 !!ctrl->channels[c].regs[R_MASKED_INTR]);
394 }
395
396 static int channel_out_run(struct fs_dma_ctrl *ctrl, int c)
397 {
398 uint32_t len;
399 uint32_t saved_data_buf;
400 unsigned char buf[2 * 1024];
401
402 struct dma_context_metadata meta;
403 bool send_context = true;
404
405 if (ctrl->channels[c].eol)
406 return 0;
407
408 do {
409 bool out_eop;
410 D(printf("ch=%d buf=%x after=%x\n",
411 c,
412 (uint32_t)ctrl->channels[c].current_d.buf,
413 (uint32_t)ctrl->channels[c].current_d.after));
414
415 if (send_context) {
416 if (ctrl->channels[c].client->client.metadata_push) {
417 meta.metadata = ctrl->channels[c].current_d.md;
418 ctrl->channels[c].client->client.metadata_push(
419 ctrl->channels[c].client->client.opaque,
420 &meta);
421 }
422 send_context = false;
423 }
424
425 channel_load_d(ctrl, c);
426 saved_data_buf = channel_reg(ctrl, c, RW_SAVED_DATA_BUF);
427 len = (uint32_t)(unsigned long)
428 ctrl->channels[c].current_d.after;
429 len -= saved_data_buf;
430
431 if (len > sizeof buf)
432 len = sizeof buf;
433 cpu_physical_memory_read (saved_data_buf, buf, len);
434
435 out_eop = ((saved_data_buf + len) ==
436 ctrl->channels[c].current_d.after) &&
437 ctrl->channels[c].current_d.out_eop;
438
439 D(printf("channel %d pushes %x %u bytes eop=%u\n", c,
440 saved_data_buf, len, out_eop));
441
442 if (ctrl->channels[c].client->client.push) {
443 if (len > 0) {
444 ctrl->channels[c].client->client.push(
445 ctrl->channels[c].client->client.opaque,
446 buf, len, out_eop);
447 }
448 } else {
449 printf("WARNING: DMA ch%d dataloss,"
450 " no attached client.\n", c);
451 }
452
453 saved_data_buf += len;
454
455 if (saved_data_buf == (uint32_t)(unsigned long)
456 ctrl->channels[c].current_d.after) {
457 /* Done. Step to next. */
458 if (ctrl->channels[c].current_d.out_eop) {
459 send_context = true;
460 }
461 if (ctrl->channels[c].current_d.intr) {
462 /* data intr. */
463 D(printf("signal intr %d eol=%d\n",
464 len, ctrl->channels[c].current_d.eol));
465 ctrl->channels[c].regs[R_INTR] |= (1 << 2);
466 channel_update_irq(ctrl, c);
467 }
468 channel_store_d(ctrl, c);
469 if (ctrl->channels[c].current_d.eol) {
470 D(printf("channel %d EOL\n", c));
471 ctrl->channels[c].eol = 1;
472
473 /* Mark the context as disabled. */
474 ctrl->channels[c].current_c.dis = 1;
475 channel_store_c(ctrl, c);
476
477 channel_stop(ctrl, c);
478 } else {
479 ctrl->channels[c].regs[RW_SAVED_DATA] =
480 (uint32_t)(unsigned long)ctrl->
481 channels[c].current_d.next;
482 /* Load new descriptor. */
483 channel_load_d(ctrl, c);
484 saved_data_buf = (uint32_t)(unsigned long)
485 ctrl->channels[c].current_d.buf;
486 }
487
488 ctrl->channels[c].regs[RW_SAVED_DATA_BUF] =
489 saved_data_buf;
490 D(dump_d(c, &ctrl->channels[c].current_d));
491 }
492 ctrl->channels[c].regs[RW_SAVED_DATA_BUF] = saved_data_buf;
493 } while (!ctrl->channels[c].eol);
494 return 1;
495 }
496
497 static int channel_in_process(struct fs_dma_ctrl *ctrl, int c,
498 unsigned char *buf, int buflen, int eop)
499 {
500 uint32_t len;
501 uint32_t saved_data_buf;
502
503 if (ctrl->channels[c].eol == 1)
504 return 0;
505
506 channel_load_d(ctrl, c);
507 saved_data_buf = channel_reg(ctrl, c, RW_SAVED_DATA_BUF);
508 len = (uint32_t)(unsigned long)ctrl->channels[c].current_d.after;
509 len -= saved_data_buf;
510
511 if (len > buflen)
512 len = buflen;
513
514 cpu_physical_memory_write (saved_data_buf, buf, len);
515 saved_data_buf += len;
516
517 if (saved_data_buf ==
518 (uint32_t)(unsigned long)ctrl->channels[c].current_d.after
519 || eop) {
520 uint32_t r_intr = ctrl->channels[c].regs[R_INTR];
521
522 D(printf("in dscr end len=%d\n",
523 ctrl->channels[c].current_d.after
524 - ctrl->channels[c].current_d.buf));
525 ctrl->channels[c].current_d.after = saved_data_buf;
526
527 /* Done. Step to next. */
528 if (ctrl->channels[c].current_d.intr) {
529 /* TODO: signal eop to the client. */
530 /* data intr. */
531 ctrl->channels[c].regs[R_INTR] |= 3;
532 }
533 if (eop) {
534 ctrl->channels[c].current_d.in_eop = 1;
535 ctrl->channels[c].regs[R_INTR] |= 8;
536 }
537 if (r_intr != ctrl->channels[c].regs[R_INTR])
538 channel_update_irq(ctrl, c);
539
540 channel_store_d(ctrl, c);
541 D(dump_d(c, &ctrl->channels[c].current_d));
542
543 if (ctrl->channels[c].current_d.eol) {
544 D(printf("channel %d EOL\n", c));
545 ctrl->channels[c].eol = 1;
546
547 /* Mark the context as disabled. */
548 ctrl->channels[c].current_c.dis = 1;
549 channel_store_c(ctrl, c);
550
551 channel_stop(ctrl, c);
552 } else {
553 ctrl->channels[c].regs[RW_SAVED_DATA] =
554 (uint32_t)(unsigned long)ctrl->
555 channels[c].current_d.next;
556 /* Load new descriptor. */
557 channel_load_d(ctrl, c);
558 saved_data_buf = (uint32_t)(unsigned long)
559 ctrl->channels[c].current_d.buf;
560 }
561 }
562
563 ctrl->channels[c].regs[RW_SAVED_DATA_BUF] = saved_data_buf;
564 return len;
565 }
566
567 static inline int channel_in_run(struct fs_dma_ctrl *ctrl, int c)
568 {
569 if (ctrl->channels[c].client->client.pull) {
570 ctrl->channels[c].client->client.pull(
571 ctrl->channels[c].client->client.opaque);
572 return 1;
573 } else
574 return 0;
575 }
576
577 static uint32_t dma_rinvalid (void *opaque, hwaddr addr)
578 {
579 hw_error("Unsupported short raccess. reg=" TARGET_FMT_plx "\n", addr);
580 return 0;
581 }
582
583 static uint64_t
584 dma_read(void *opaque, hwaddr addr, unsigned int size)
585 {
586 struct fs_dma_ctrl *ctrl = opaque;
587 int c;
588 uint32_t r = 0;
589
590 if (size != 4) {
591 dma_rinvalid(opaque, addr);
592 }
593
594 /* Make addr relative to this channel and bounded to nr regs. */
595 c = fs_channel(addr);
596 addr &= 0xff;
597 addr >>= 2;
598 switch (addr)
599 {
600 case RW_STAT:
601 r = ctrl->channels[c].state & 7;
602 r |= ctrl->channels[c].eol << 5;
603 r |= ctrl->channels[c].stream_cmd_src << 8;
604 break;
605
606 default:
607 r = ctrl->channels[c].regs[addr];
608 D(printf ("%s c=%d addr=" TARGET_FMT_plx "\n",
609 __func__, c, addr));
610 break;
611 }
612 return r;
613 }
614
615 static void
616 dma_winvalid (void *opaque, hwaddr addr, uint32_t value)
617 {
618 hw_error("Unsupported short waccess. reg=" TARGET_FMT_plx "\n", addr);
619 }
620
621 static void
622 dma_update_state(struct fs_dma_ctrl *ctrl, int c)
623 {
624 if (ctrl->channels[c].regs[RW_CFG] & 2)
625 ctrl->channels[c].state = STOPPED;
626 if (!(ctrl->channels[c].regs[RW_CFG] & 1))
627 ctrl->channels[c].state = RST;
628 }
629
630 static void
631 dma_write(void *opaque, hwaddr addr,
632 uint64_t val64, unsigned int size)
633 {
634 struct fs_dma_ctrl *ctrl = opaque;
635 uint32_t value = val64;
636 int c;
637
638 if (size != 4) {
639 dma_winvalid(opaque, addr, value);
640 }
641
642 /* Make addr relative to this channel and bounded to nr regs. */
643 c = fs_channel(addr);
644 addr &= 0xff;
645 addr >>= 2;
646 switch (addr)
647 {
648 case RW_DATA:
649 ctrl->channels[c].regs[addr] = value;
650 break;
651
652 case RW_CFG:
653 ctrl->channels[c].regs[addr] = value;
654 dma_update_state(ctrl, c);
655 break;
656 case RW_CMD:
657 /* continue. */
658 if (value & ~1)
659 printf("Invalid store to ch=%d RW_CMD %x\n",
660 c, value);
661 ctrl->channels[c].regs[addr] = value;
662 channel_continue(ctrl, c);
663 break;
664
665 case RW_SAVED_DATA:
666 case RW_SAVED_DATA_BUF:
667 case RW_GROUP:
668 case RW_GROUP_DOWN:
669 ctrl->channels[c].regs[addr] = value;
670 break;
671
672 case RW_ACK_INTR:
673 case RW_INTR_MASK:
674 ctrl->channels[c].regs[addr] = value;
675 channel_update_irq(ctrl, c);
676 if (addr == RW_ACK_INTR)
677 ctrl->channels[c].regs[RW_ACK_INTR] = 0;
678 break;
679
680 case RW_STREAM_CMD:
681 if (value & ~1023)
682 printf("Invalid store to ch=%d "
683 "RW_STREAMCMD %x\n",
684 c, value);
685 ctrl->channels[c].regs[addr] = value;
686 D(printf("stream_cmd ch=%d\n", c));
687 channel_stream_cmd(ctrl, c, value);
688 break;
689
690 default:
691 D(printf ("%s c=%d " TARGET_FMT_plx "\n",
692 __func__, c, addr));
693 break;
694 }
695 }
696
697 static const MemoryRegionOps dma_ops = {
698 .read = dma_read,
699 .write = dma_write,
700 .endianness = DEVICE_NATIVE_ENDIAN,
701 .valid = {
702 .min_access_size = 1,
703 .max_access_size = 4
704 }
705 };
706
707 static int etraxfs_dmac_run(void *opaque)
708 {
709 struct fs_dma_ctrl *ctrl = opaque;
710 int i;
711 int p = 0;
712
713 for (i = 0;
714 i < ctrl->nr_channels;
715 i++)
716 {
717 if (ctrl->channels[i].state == RUNNING)
718 {
719 if (ctrl->channels[i].input) {
720 p += channel_in_run(ctrl, i);
721 } else {
722 p += channel_out_run(ctrl, i);
723 }
724 }
725 }
726 return p;
727 }
728
729 int etraxfs_dmac_input(struct etraxfs_dma_client *client,
730 void *buf, int len, int eop)
731 {
732 return channel_in_process(client->ctrl, client->channel,
733 buf, len, eop);
734 }
735
736 /* Connect an IRQ line with a channel. */
737 void etraxfs_dmac_connect(void *opaque, int c, qemu_irq *line, int input)
738 {
739 struct fs_dma_ctrl *ctrl = opaque;
740 ctrl->channels[c].irq = *line;
741 ctrl->channels[c].input = input;
742 }
743
744 void etraxfs_dmac_connect_client(void *opaque, int c,
745 struct etraxfs_dma_client *cl)
746 {
747 struct fs_dma_ctrl *ctrl = opaque;
748 cl->ctrl = ctrl;
749 cl->channel = c;
750 ctrl->channels[c].client = cl;
751 }
752
753
754 static void DMA_run(void *opaque)
755 {
756 struct fs_dma_ctrl *etraxfs_dmac = opaque;
757 int p = 1;
758
759 if (runstate_is_running())
760 p = etraxfs_dmac_run(etraxfs_dmac);
761
762 if (p)
763 qemu_bh_schedule_idle(etraxfs_dmac->bh);
764 }
765
766 void *etraxfs_dmac_init(hwaddr base, int nr_channels)
767 {
768 struct fs_dma_ctrl *ctrl = NULL;
769
770 ctrl = g_malloc0(sizeof *ctrl);
771
772 ctrl->bh = qemu_bh_new(DMA_run, ctrl);
773
774 ctrl->nr_channels = nr_channels;
775 ctrl->channels = g_malloc0(sizeof ctrl->channels[0] * nr_channels);
776
777 memory_region_init_io(&ctrl->mmio, NULL, &dma_ops, ctrl, "etraxfs-dma",
778 nr_channels * 0x2000);
779 memory_region_add_subregion(get_system_memory(), base, &ctrl->mmio);
780
781 return ctrl;
782 }
AR7 emulation for QEMU