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vga: Replace VGA_COMMON with a structure
[qemu.git] / hw / etraxfs_dma.c
blob12dd78db27e9024cf001e8b0655223451b451aac
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 <stdio.h>
25 #include <sys/time.h>
26 #include "hw.h"
27 #include "qemu-common.h"
28 #include "sysemu.h"
29
30 #include "etraxfs_dma.h"
31
32 #define D(x)
33
34 #define RW_DATA (0x0 / 4)
35 #define RW_SAVED_DATA (0x58 / 4)
36 #define RW_SAVED_DATA_BUF (0x5c / 4)
37 #define RW_GROUP (0x60 / 4)
38 #define RW_GROUP_DOWN (0x7c / 4)
39 #define RW_CMD (0x80 / 4)
40 #define RW_CFG (0x84 / 4)
41 #define RW_STAT (0x88 / 4)
42 #define RW_INTR_MASK (0x8c / 4)
43 #define RW_ACK_INTR (0x90 / 4)
44 #define R_INTR (0x94 / 4)
45 #define R_MASKED_INTR (0x98 / 4)
46 #define RW_STREAM_CMD (0x9c / 4)
47
48 #define DMA_REG_MAX (0x100 / 4)
49
50 /* descriptors */
51
52 // ------------------------------------------------------------ dma_descr_group
53 typedef struct dma_descr_group {
54 struct dma_descr_group *next;
55 unsigned eol : 1;
56 unsigned tol : 1;
57 unsigned bol : 1;
58 unsigned : 1;
59 unsigned intr : 1;
60 unsigned : 2;
61 unsigned en : 1;
62 unsigned : 7;
63 unsigned dis : 1;
64 unsigned md : 16;
65 struct dma_descr_group *up;
66 union {
67 struct dma_descr_context *context;
68 struct dma_descr_group *group;
69 } down;
70 } dma_descr_group;
71
72 // ---------------------------------------------------------- dma_descr_context
73 typedef struct dma_descr_context {
74 struct dma_descr_context *next;
75 unsigned eol : 1;
76 unsigned : 3;
77 unsigned intr : 1;
78 unsigned : 1;
79 unsigned store_mode : 1;
80 unsigned en : 1;
81 unsigned : 7;
82 unsigned dis : 1;
83 unsigned md0 : 16;
84 unsigned md1;
85 unsigned md2;
86 unsigned md3;
87 unsigned md4;
88 struct dma_descr_data *saved_data;
89 char *saved_data_buf;
90 } dma_descr_context;
91
92 // ------------------------------------------------------------- dma_descr_data
93 typedef struct dma_descr_data {
94 struct dma_descr_data *next;
95 char *buf;
96 unsigned eol : 1;
97 unsigned : 2;
98 unsigned out_eop : 1;
99 unsigned intr : 1;
100 unsigned wait : 1;
101 unsigned : 2;
102 unsigned : 3;
103 unsigned in_eop : 1;
104 unsigned : 4;
105 unsigned md : 16;
106 char *after;
107 } dma_descr_data;
108
109 /* Constants */
110 enum {
111 regk_dma_ack_pkt = 0x00000100,
112 regk_dma_anytime = 0x00000001,
113 regk_dma_array = 0x00000008,
114 regk_dma_burst = 0x00000020,
115 regk_dma_client = 0x00000002,
116 regk_dma_copy_next = 0x00000010,
117 regk_dma_copy_up = 0x00000020,
118 regk_dma_data_at_eol = 0x00000001,
119 regk_dma_dis_c = 0x00000010,
120 regk_dma_dis_g = 0x00000020,
121 regk_dma_idle = 0x00000001,
122 regk_dma_intern = 0x00000004,
123 regk_dma_load_c = 0x00000200,
124 regk_dma_load_c_n = 0x00000280,
125 regk_dma_load_c_next = 0x00000240,
126 regk_dma_load_d = 0x00000140,
127 regk_dma_load_g = 0x00000300,
128 regk_dma_load_g_down = 0x000003c0,
129 regk_dma_load_g_next = 0x00000340,
130 regk_dma_load_g_up = 0x00000380,
131 regk_dma_next_en = 0x00000010,
132 regk_dma_next_pkt = 0x00000010,
133 regk_dma_no = 0x00000000,
134 regk_dma_only_at_wait = 0x00000000,
135 regk_dma_restore = 0x00000020,
136 regk_dma_rst = 0x00000001,
137 regk_dma_running = 0x00000004,
138 regk_dma_rw_cfg_default = 0x00000000,
139 regk_dma_rw_cmd_default = 0x00000000,
140 regk_dma_rw_intr_mask_default = 0x00000000,
141 regk_dma_rw_stat_default = 0x00000101,
142 regk_dma_rw_stream_cmd_default = 0x00000000,
143 regk_dma_save_down = 0x00000020,
144 regk_dma_save_up = 0x00000020,
145 regk_dma_set_reg = 0x00000050,
146 regk_dma_set_w_size1 = 0x00000190,
147 regk_dma_set_w_size2 = 0x000001a0,
148 regk_dma_set_w_size4 = 0x000001c0,
149 regk_dma_stopped = 0x00000002,
150 regk_dma_store_c = 0x00000002,
151 regk_dma_store_descr = 0x00000000,
152 regk_dma_store_g = 0x00000004,
153 regk_dma_store_md = 0x00000001,
154 regk_dma_sw = 0x00000008,
155 regk_dma_update_down = 0x00000020,
156 regk_dma_yes = 0x00000001
157 };
158
159 enum dma_ch_state
160 {
161 RST = 1,
162 STOPPED = 2,
163 RUNNING = 4
164 };
165
166 struct fs_dma_channel
167 {
168 qemu_irq *irq;
169 struct etraxfs_dma_client *client;
170
171 /* Internal status. */
172 int stream_cmd_src;
173 enum dma_ch_state state;
174
175 unsigned int input : 1;
176 unsigned int eol : 1;
177
178 struct dma_descr_group current_g;
179 struct dma_descr_context current_c;
180 struct dma_descr_data current_d;
181
182 /* Controll registers. */
183 uint32_t regs[DMA_REG_MAX];
184 };
185
186 struct fs_dma_ctrl
187 {
188 int map;
189 CPUState *env;
190
191 int nr_channels;
192 struct fs_dma_channel *channels;
193
194 QEMUBH *bh;
195 };
196
197 static void DMA_run(void *opaque);
198 static int channel_out_run(struct fs_dma_ctrl *ctrl, int c);
199
200 static inline uint32_t channel_reg(struct fs_dma_ctrl *ctrl, int c, int reg)
201 {
202 return ctrl->channels[c].regs[reg];
203 }
204
205 static inline int channel_stopped(struct fs_dma_ctrl *ctrl, int c)
206 {
207 return channel_reg(ctrl, c, RW_CFG) & 2;
208 }
209
210 static inline int channel_en(struct fs_dma_ctrl *ctrl, int c)
211 {
212 return (channel_reg(ctrl, c, RW_CFG) & 1)
213 && ctrl->channels[c].client;
214 }
215
216 static inline int fs_channel(target_phys_addr_t addr)
217 {
218 /* Every channel has a 0x2000 ctrl register map. */
219 return addr >> 13;
220 }
221
222 #ifdef USE_THIS_DEAD_CODE
223 static void channel_load_g(struct fs_dma_ctrl *ctrl, int c)
224 {
225 target_phys_addr_t addr = channel_reg(ctrl, c, RW_GROUP);
226
227 /* Load and decode. FIXME: handle endianness. */
228 cpu_physical_memory_read (addr,
229 (void *) &ctrl->channels[c].current_g,
230 sizeof ctrl->channels[c].current_g);
231 }
232
233 static void dump_c(int ch, struct dma_descr_context *c)
234 {
235 printf("%s ch=%d\n", __func__, ch);
236 printf("next=%p\n", c->next);
237 printf("saved_data=%p\n", c->saved_data);
238 printf("saved_data_buf=%p\n", c->saved_data_buf);
239 printf("eol=%x\n", (uint32_t) c->eol);
240 }
241
242 static void dump_d(int ch, struct dma_descr_data *d)
243 {
244 printf("%s ch=%d\n", __func__, ch);
245 printf("next=%p\n", d->next);
246 printf("buf=%p\n", d->buf);
247 printf("after=%p\n", d->after);
248 printf("intr=%x\n", (uint32_t) d->intr);
249 printf("out_eop=%x\n", (uint32_t) d->out_eop);
250 printf("in_eop=%x\n", (uint32_t) d->in_eop);
251 printf("eol=%x\n", (uint32_t) d->eol);
252 }
253 #endif
254
255 static void channel_load_c(struct fs_dma_ctrl *ctrl, int c)
256 {
257 target_phys_addr_t addr = channel_reg(ctrl, c, RW_GROUP_DOWN);
258
259 /* Load and decode. FIXME: handle endianness. */
260 cpu_physical_memory_read (addr,
261 (void *) &ctrl->channels[c].current_c,
262 sizeof ctrl->channels[c].current_c);
263
264 D(dump_c(c, &ctrl->channels[c].current_c));
265 /* I guess this should update the current pos. */
266 ctrl->channels[c].regs[RW_SAVED_DATA] =
267 (uint32_t)(unsigned long)ctrl->channels[c].current_c.saved_data;
268 ctrl->channels[c].regs[RW_SAVED_DATA_BUF] =
269 (uint32_t)(unsigned long)ctrl->channels[c].current_c.saved_data_buf;
270 }
271
272 static void channel_load_d(struct fs_dma_ctrl *ctrl, int c)
273 {
274 target_phys_addr_t addr = channel_reg(ctrl, c, RW_SAVED_DATA);
275
276 /* Load and decode. FIXME: handle endianness. */
277 D(printf("%s ch=%d addr=%x\n", __func__, c, addr));
278 cpu_physical_memory_read (addr,
279 (void *) &ctrl->channels[c].current_d,
280 sizeof ctrl->channels[c].current_d);
281
282 D(dump_d(c, &ctrl->channels[c].current_d));
283 ctrl->channels[c].regs[RW_DATA] = addr;
284 }
285
286 static void channel_store_c(struct fs_dma_ctrl *ctrl, int c)
287 {
288 target_phys_addr_t addr = channel_reg(ctrl, c, RW_GROUP_DOWN);
289
290 /* Encode and store. FIXME: handle endianness. */
291 D(printf("%s ch=%d addr=%x\n", __func__, c, addr));
292 D(dump_d(c, &ctrl->channels[c].current_d));
293 cpu_physical_memory_write (addr,
294 (void *) &ctrl->channels[c].current_c,
295 sizeof ctrl->channels[c].current_c);
296 }
297
298 static void channel_store_d(struct fs_dma_ctrl *ctrl, int c)
299 {
300 target_phys_addr_t addr = channel_reg(ctrl, c, RW_SAVED_DATA);
301
302 /* Encode and store. FIXME: handle endianness. */
303 D(printf("%s ch=%d addr=%x\n", __func__, c, addr));
304 cpu_physical_memory_write (addr,
305 (void *) &ctrl->channels[c].current_d,
306 sizeof ctrl->channels[c].current_d);
307 }
308
309 static inline void channel_stop(struct fs_dma_ctrl *ctrl, int c)
310 {
311 /* FIXME: */
312 }
313
314 static inline void channel_start(struct fs_dma_ctrl *ctrl, int c)
315 {
316 if (ctrl->channels[c].client)
317 {
318 ctrl->channels[c].eol = 0;
319 ctrl->channels[c].state = RUNNING;
320 if (!ctrl->channels[c].input)
321 channel_out_run(ctrl, c);
322 } else
323 printf("WARNING: starting DMA ch %d with no client\n", c);
324
325 qemu_bh_schedule_idle(ctrl->bh);
326 }
327
328 static void channel_continue(struct fs_dma_ctrl *ctrl, int c)
329 {
330 if (!channel_en(ctrl, c)
331 || channel_stopped(ctrl, c)
332 || ctrl->channels[c].state != RUNNING
333 /* Only reload the current data descriptor if it has eol set. */
334 || !ctrl->channels[c].current_d.eol) {
335 D(printf("continue failed ch=%d state=%d stopped=%d en=%d eol=%d\n",
336 c, ctrl->channels[c].state,
337 channel_stopped(ctrl, c),
338 channel_en(ctrl,c),
339 ctrl->channels[c].eol));
340 D(dump_d(c, &ctrl->channels[c].current_d));
341 return;
342 }
343
344 /* Reload the current descriptor. */
345 channel_load_d(ctrl, c);
346
347 /* If the current descriptor cleared the eol flag and we had already
348 reached eol state, do the continue. */
349 if (!ctrl->channels[c].current_d.eol && ctrl->channels[c].eol) {
350 D(printf("continue %d ok %p\n", c,
351 ctrl->channels[c].current_d.next));
352 ctrl->channels[c].regs[RW_SAVED_DATA] =
353 (uint32_t)(unsigned long)ctrl->channels[c].current_d.next;
354 channel_load_d(ctrl, c);
355 ctrl->channels[c].regs[RW_SAVED_DATA_BUF] =
356 (uint32_t)(unsigned long)ctrl->channels[c].current_d.buf;
357
358 channel_start(ctrl, c);
359 }
360 ctrl->channels[c].regs[RW_SAVED_DATA_BUF] =
361 (uint32_t)(unsigned long)ctrl->channels[c].current_d.buf;
362 }
363
364 static void channel_stream_cmd(struct fs_dma_ctrl *ctrl, int c, uint32_t v)
365 {
366 unsigned int cmd = v & ((1 << 10) - 1);
367
368 D(printf("%s ch=%d cmd=%x\n",
369 __func__, c, cmd));
370 if (cmd & regk_dma_load_d) {
371 channel_load_d(ctrl, c);
372 if (cmd & regk_dma_burst)
373 channel_start(ctrl, c);
374 }
375
376 if (cmd & regk_dma_load_c) {
377 channel_load_c(ctrl, c);
378 }
379 }
380
381 static void channel_update_irq(struct fs_dma_ctrl *ctrl, int c)
382 {
383 D(printf("%s %d\n", __func__, c));
384 ctrl->channels[c].regs[R_INTR] &=
385 ~(ctrl->channels[c].regs[RW_ACK_INTR]);
386
387 ctrl->channels[c].regs[R_MASKED_INTR] =
388 ctrl->channels[c].regs[R_INTR]
389 & ctrl->channels[c].regs[RW_INTR_MASK];
390
391 D(printf("%s: chan=%d masked_intr=%x\n", __func__,
392 c,
393 ctrl->channels[c].regs[R_MASKED_INTR]));
394
395 qemu_set_irq(ctrl->channels[c].irq[0],
396 !!ctrl->channels[c].regs[R_MASKED_INTR]);
397 }
398
399 static int channel_out_run(struct fs_dma_ctrl *ctrl, int c)
400 {
401 uint32_t len;
402 uint32_t saved_data_buf;
403 unsigned char buf[2 * 1024];
404
405 if (ctrl->channels[c].eol)
406 return 0;
407
408 do {
409 D(printf("ch=%d buf=%x after=%x saved_data_buf=%x\n",
410 c,
411 (uint32_t)ctrl->channels[c].current_d.buf,
412 (uint32_t)ctrl->channels[c].current_d.after,
413 saved_data_buf));
414
415 channel_load_d(ctrl, c);
416 saved_data_buf = channel_reg(ctrl, c, RW_SAVED_DATA_BUF);
417 len = (uint32_t)(unsigned long)
418 ctrl->channels[c].current_d.after;
419 len -= saved_data_buf;
420
421 if (len > sizeof buf)
422 len = sizeof buf;
423 cpu_physical_memory_read (saved_data_buf, buf, len);
424
425 D(printf("channel %d pushes %x %u bytes\n", c,
426 saved_data_buf, len));
427
428 if (ctrl->channels[c].client->client.push)
429 ctrl->channels[c].client->client.push(
430 ctrl->channels[c].client->client.opaque,
431 buf, len);
432 else
433 printf("WARNING: DMA ch%d dataloss,"
434 " no attached client.\n", c);
435
436 saved_data_buf += len;
437
438 if (saved_data_buf == (uint32_t)(unsigned long)
439 ctrl->channels[c].current_d.after) {
440 /* Done. Step to next. */
441 if (ctrl->channels[c].current_d.out_eop) {
442 /* TODO: signal eop to the client. */
443 D(printf("signal eop\n"));
444 }
445 if (ctrl->channels[c].current_d.intr) {
446 /* TODO: signal eop to the client. */
447 /* data intr. */
448 D(printf("signal intr %d eol=%d\n",
449 len, ctrl->channels[c].current_d.eol));
450 ctrl->channels[c].regs[R_INTR] |= (1 << 2);
451 channel_update_irq(ctrl, c);
452 }
453 channel_store_d(ctrl, c);
454 if (ctrl->channels[c].current_d.eol) {
455 D(printf("channel %d EOL\n", c));
456 ctrl->channels[c].eol = 1;
457
458 /* Mark the context as disabled. */
459 ctrl->channels[c].current_c.dis = 1;
460 channel_store_c(ctrl, c);
461
462 channel_stop(ctrl, c);
463 } else {
464 ctrl->channels[c].regs[RW_SAVED_DATA] =
465 (uint32_t)(unsigned long)ctrl->
466 channels[c].current_d.next;
467 /* Load new descriptor. */
468 channel_load_d(ctrl, c);
469 saved_data_buf = (uint32_t)(unsigned long)
470 ctrl->channels[c].current_d.buf;
471 }
472
473 ctrl->channels[c].regs[RW_SAVED_DATA_BUF] =
474 saved_data_buf;
475 D(dump_d(c, &ctrl->channels[c].current_d));
476 }
477 ctrl->channels[c].regs[RW_SAVED_DATA_BUF] = saved_data_buf;
478 } while (!ctrl->channels[c].eol);
479 return 1;
480 }
481
482 static int channel_in_process(struct fs_dma_ctrl *ctrl, int c,
483 unsigned char *buf, int buflen, int eop)
484 {
485 uint32_t len;
486 uint32_t saved_data_buf;
487
488 if (ctrl->channels[c].eol == 1)
489 return 0;
490
491 channel_load_d(ctrl, c);
492 saved_data_buf = channel_reg(ctrl, c, RW_SAVED_DATA_BUF);
493 len = (uint32_t)(unsigned long)ctrl->channels[c].current_d.after;
494 len -= saved_data_buf;
495
496 if (len > buflen)
497 len = buflen;
498
499 cpu_physical_memory_write (saved_data_buf, buf, len);
500 saved_data_buf += len;
501
502 if (saved_data_buf ==
503 (uint32_t)(unsigned long)ctrl->channels[c].current_d.after
504 || eop) {
505 uint32_t r_intr = ctrl->channels[c].regs[R_INTR];
506
507 D(printf("in dscr end len=%d\n",
508 ctrl->channels[c].current_d.after
509 - ctrl->channels[c].current_d.buf));
510 ctrl->channels[c].current_d.after =
511 (void *)(unsigned long) saved_data_buf;
512
513 /* Done. Step to next. */
514 if (ctrl->channels[c].current_d.intr) {
515 /* TODO: signal eop to the client. */
516 /* data intr. */
517 ctrl->channels[c].regs[R_INTR] |= 3;
518 }
519 if (eop) {
520 ctrl->channels[c].current_d.in_eop = 1;
521 ctrl->channels[c].regs[R_INTR] |= 8;
522 }
523 if (r_intr != ctrl->channels[c].regs[R_INTR])
524 channel_update_irq(ctrl, c);
525
526 channel_store_d(ctrl, c);
527 D(dump_d(c, &ctrl->channels[c].current_d));
528
529 if (ctrl->channels[c].current_d.eol) {
530 D(printf("channel %d EOL\n", c));
531 ctrl->channels[c].eol = 1;
532
533 /* Mark the context as disabled. */
534 ctrl->channels[c].current_c.dis = 1;
535 channel_store_c(ctrl, c);
536
537 channel_stop(ctrl, c);
538 } else {
539 ctrl->channels[c].regs[RW_SAVED_DATA] =
540 (uint32_t)(unsigned long)ctrl->
541 channels[c].current_d.next;
542 /* Load new descriptor. */
543 channel_load_d(ctrl, c);
544 saved_data_buf = (uint32_t)(unsigned long)
545 ctrl->channels[c].current_d.buf;
546 }
547 }
548
549 ctrl->channels[c].regs[RW_SAVED_DATA_BUF] = saved_data_buf;
550 return len;
551 }
552
553 static inline int channel_in_run(struct fs_dma_ctrl *ctrl, int c)
554 {
555 if (ctrl->channels[c].client->client.pull) {
556 ctrl->channels[c].client->client.pull(
557 ctrl->channels[c].client->client.opaque);
558 return 1;
559 } else
560 return 0;
561 }
562
563 static uint32_t dma_rinvalid (void *opaque, target_phys_addr_t addr)
564 {
565 hw_error("Unsupported short access. reg=" TARGET_FMT_plx "\n", addr);
566 return 0;
567 }
568
569 static uint32_t
570 dma_readl (void *opaque, target_phys_addr_t addr)
571 {
572 struct fs_dma_ctrl *ctrl = opaque;
573 int c;
574 uint32_t r = 0;
575
576 /* Make addr relative to this channel and bounded to nr regs. */
577 c = fs_channel(addr);
578 addr &= 0xff;
579 addr >>= 2;
580 switch (addr)
581 {
582 case RW_STAT:
583 r = ctrl->channels[c].state & 7;
584 r |= ctrl->channels[c].eol << 5;
585 r |= ctrl->channels[c].stream_cmd_src << 8;
586 break;
587
588 default:
589 r = ctrl->channels[c].regs[addr];
590 D(printf ("%s c=%d addr=%x\n",
591 __func__, c, addr));
592 break;
593 }
594 return r;
595 }
596
597 static void
598 dma_winvalid (void *opaque, target_phys_addr_t addr, uint32_t value)
599 {
600 hw_error("Unsupported short access. reg=" TARGET_FMT_plx "\n", addr);
601 }
602
603 static void
604 dma_update_state(struct fs_dma_ctrl *ctrl, int c)
605 {
606 if ((ctrl->channels[c].regs[RW_CFG] & 1) != 3) {
607 if (ctrl->channels[c].regs[RW_CFG] & 2)
608 ctrl->channels[c].state = STOPPED;
609 if (!(ctrl->channels[c].regs[RW_CFG] & 1))
610 ctrl->channels[c].state = RST;
611 }
612 }
613
614 static void
615 dma_writel (void *opaque, target_phys_addr_t addr, uint32_t value)
616 {
617 struct fs_dma_ctrl *ctrl = opaque;
618 int c;
619
620 /* Make addr relative to this channel and bounded to nr regs. */
621 c = fs_channel(addr);
622 addr &= 0xff;
623 addr >>= 2;
624 switch (addr)
625 {
626 case RW_DATA:
627 ctrl->channels[c].regs[addr] = value;
628 break;
629
630 case RW_CFG:
631 ctrl->channels[c].regs[addr] = value;
632 dma_update_state(ctrl, c);
633 break;
634 case RW_CMD:
635 /* continue. */
636 if (value & ~1)
637 printf("Invalid store to ch=%d RW_CMD %x\n",
638 c, value);
639 ctrl->channels[c].regs[addr] = value;
640 channel_continue(ctrl, c);
641 break;
642
643 case RW_SAVED_DATA:
644 case RW_SAVED_DATA_BUF:
645 case RW_GROUP:
646 case RW_GROUP_DOWN:
647 ctrl->channels[c].regs[addr] = value;
648 break;
649
650 case RW_ACK_INTR:
651 case RW_INTR_MASK:
652 ctrl->channels[c].regs[addr] = value;
653 channel_update_irq(ctrl, c);
654 if (addr == RW_ACK_INTR)
655 ctrl->channels[c].regs[RW_ACK_INTR] = 0;
656 break;
657
658 case RW_STREAM_CMD:
659 if (value & ~1023)
660 printf("Invalid store to ch=%d "
661 "RW_STREAMCMD %x\n",
662 c, value);
663 ctrl->channels[c].regs[addr] = value;
664 D(printf("stream_cmd ch=%d\n", c));
665 channel_stream_cmd(ctrl, c, value);
666 break;
667
668 default:
669 D(printf ("%s c=%d %x %x\n", __func__, c, addr));
670 break;
671 }
672 }
673
674 static CPUReadMemoryFunc *dma_read[] = {
675 &dma_rinvalid,
676 &dma_rinvalid,
677 &dma_readl,
678 };
679
680 static CPUWriteMemoryFunc *dma_write[] = {
681 &dma_winvalid,
682 &dma_winvalid,
683 &dma_writel,
684 };
685
686 static int etraxfs_dmac_run(void *opaque)
687 {
688 struct fs_dma_ctrl *ctrl = opaque;
689 int i;
690 int p = 0;
691
692 for (i = 0;
693 i < ctrl->nr_channels;
694 i++)
695 {
696 if (ctrl->channels[i].state == RUNNING)
697 {
698 if (ctrl->channels[i].input) {
699 p += channel_in_run(ctrl, i);
700 } else {
701 p += channel_out_run(ctrl, i);
702 }
703 }
704 }
705 return p;
706 }
707
708 int etraxfs_dmac_input(struct etraxfs_dma_client *client,
709 void *buf, int len, int eop)
710 {
711 return channel_in_process(client->ctrl, client->channel,
712 buf, len, eop);
713 }
714
715 /* Connect an IRQ line with a channel. */
716 void etraxfs_dmac_connect(void *opaque, int c, qemu_irq *line, int input)
717 {
718 struct fs_dma_ctrl *ctrl = opaque;
719 ctrl->channels[c].irq = line;
720 ctrl->channels[c].input = input;
721 }
722
723 void etraxfs_dmac_connect_client(void *opaque, int c,
724 struct etraxfs_dma_client *cl)
725 {
726 struct fs_dma_ctrl *ctrl = opaque;
727 cl->ctrl = ctrl;
728 cl->channel = c;
729 ctrl->channels[c].client = cl;
730 }
731
732
733 static void DMA_run(void *opaque)
734 {
735 struct fs_dma_ctrl *etraxfs_dmac = opaque;
736 int p = 1;
737
738 if (vm_running)
739 p = etraxfs_dmac_run(etraxfs_dmac);
740
741 if (p)
742 qemu_bh_schedule_idle(etraxfs_dmac->bh);
743 }
744
745 void *etraxfs_dmac_init(CPUState *env,
746 target_phys_addr_t base, int nr_channels)
747 {
748 struct fs_dma_ctrl *ctrl = NULL;
749
750 ctrl = qemu_mallocz(sizeof *ctrl);
751
752 ctrl->bh = qemu_bh_new(DMA_run, ctrl);
753
754 ctrl->env = env;
755 ctrl->nr_channels = nr_channels;
756 ctrl->channels = qemu_mallocz(sizeof ctrl->channels[0] * nr_channels);
757
758 ctrl->map = cpu_register_io_memory(0, dma_read, dma_write, ctrl);
759 cpu_register_physical_memory(base, nr_channels * 0x2000, ctrl->map);
760 return ctrl;
761 }
QEmu