1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *  cx18 mailbox functions
4  *
5  *  Copyright (C) 2007  Hans Verkuil <hverkuil@xs4all.nl>
6  *  Copyright (C) 2008  Andy Walls <awalls@md.metrocast.net>
7  */
8 
9 #include <linux/bitops.h>
10 
11 #include "cx18-driver.h"
12 #include "cx18-io.h"
13 #include "cx18-scb.h"
14 #include "cx18-irq.h"
15 #include "cx18-mailbox.h"
16 #include "cx18-queue.h"
17 #include "cx18-streams.h"
18 #include "cx18-alsa-pcm.h" /* FIXME make configurable */
19 
20 static const char *rpu_str[] = { "APU", "CPU", "EPU", "HPU" };
21 
22 #define API_FAST (1 << 2) /* Short timeout */
23 #define API_SLOW (1 << 3) /* Additional 300ms timeout */
24 
25 struct cx18_api_info {
26 	u32 cmd;
27 	u8 flags;		/* Flags, see above */
28 	u8 rpu;			/* Processing unit */
29 	const char *name;	/* The name of the command */
30 };
31 
32 #define API_ENTRY(rpu, x, f) { (x), (f), (rpu), #x }
33 
34 static const struct cx18_api_info api_info[] = {
35 	/* MPEG encoder API */
36 	API_ENTRY(CPU, CX18_CPU_SET_CHANNEL_TYPE,		0),
37 	API_ENTRY(CPU, CX18_EPU_DEBUG,				0),
38 	API_ENTRY(CPU, CX18_CREATE_TASK,			0),
39 	API_ENTRY(CPU, CX18_DESTROY_TASK,			0),
40 	API_ENTRY(CPU, CX18_CPU_CAPTURE_START,                  API_SLOW),
41 	API_ENTRY(CPU, CX18_CPU_CAPTURE_STOP,                   API_SLOW),
42 	API_ENTRY(CPU, CX18_CPU_CAPTURE_PAUSE,                  0),
43 	API_ENTRY(CPU, CX18_CPU_CAPTURE_RESUME,                 0),
44 	API_ENTRY(CPU, CX18_CPU_SET_CHANNEL_TYPE,               0),
45 	API_ENTRY(CPU, CX18_CPU_SET_STREAM_OUTPUT_TYPE,         0),
46 	API_ENTRY(CPU, CX18_CPU_SET_VIDEO_IN,                   0),
47 	API_ENTRY(CPU, CX18_CPU_SET_VIDEO_RATE,                 0),
48 	API_ENTRY(CPU, CX18_CPU_SET_VIDEO_RESOLUTION,           0),
49 	API_ENTRY(CPU, CX18_CPU_SET_FILTER_PARAM,               0),
50 	API_ENTRY(CPU, CX18_CPU_SET_SPATIAL_FILTER_TYPE,        0),
51 	API_ENTRY(CPU, CX18_CPU_SET_MEDIAN_CORING,              0),
52 	API_ENTRY(CPU, CX18_CPU_SET_INDEXTABLE,                 0),
53 	API_ENTRY(CPU, CX18_CPU_SET_AUDIO_PARAMETERS,           0),
54 	API_ENTRY(CPU, CX18_CPU_SET_VIDEO_MUTE,                 0),
55 	API_ENTRY(CPU, CX18_CPU_SET_AUDIO_MUTE,                 0),
56 	API_ENTRY(CPU, CX18_CPU_SET_MISC_PARAMETERS,            0),
57 	API_ENTRY(CPU, CX18_CPU_SET_RAW_VBI_PARAM,              API_SLOW),
58 	API_ENTRY(CPU, CX18_CPU_SET_CAPTURE_LINE_NO,            0),
59 	API_ENTRY(CPU, CX18_CPU_SET_COPYRIGHT,                  0),
60 	API_ENTRY(CPU, CX18_CPU_SET_AUDIO_PID,                  0),
61 	API_ENTRY(CPU, CX18_CPU_SET_VIDEO_PID,                  0),
62 	API_ENTRY(CPU, CX18_CPU_SET_VER_CROP_LINE,              0),
63 	API_ENTRY(CPU, CX18_CPU_SET_GOP_STRUCTURE,              0),
64 	API_ENTRY(CPU, CX18_CPU_SET_SCENE_CHANGE_DETECTION,     0),
65 	API_ENTRY(CPU, CX18_CPU_SET_ASPECT_RATIO,               0),
66 	API_ENTRY(CPU, CX18_CPU_SET_SKIP_INPUT_FRAME,           0),
67 	API_ENTRY(CPU, CX18_CPU_SET_SLICED_VBI_PARAM,           0),
68 	API_ENTRY(CPU, CX18_CPU_SET_USERDATA_PLACE_HOLDER,      0),
69 	API_ENTRY(CPU, CX18_CPU_GET_ENC_PTS,                    0),
70 	API_ENTRY(CPU, CX18_CPU_SET_VFC_PARAM,                  0),
71 	API_ENTRY(CPU, CX18_CPU_DE_SET_MDL_ACK,			0),
72 	API_ENTRY(CPU, CX18_CPU_DE_SET_MDL,			API_FAST),
73 	API_ENTRY(CPU, CX18_CPU_DE_RELEASE_MDL,			API_SLOW),
74 	API_ENTRY(APU, CX18_APU_START,				0),
75 	API_ENTRY(APU, CX18_APU_STOP,				0),
76 	API_ENTRY(APU, CX18_APU_RESETAI,			0),
77 	API_ENTRY(CPU, CX18_CPU_DEBUG_PEEK32,			0),
78 	API_ENTRY(0, 0,						0),
79 };
80 
81 static const struct cx18_api_info *find_api_info(u32 cmd)
82 {
83 	int i;
84 
85 	for (i = 0; api_info[i].cmd; i++)
86 		if (api_info[i].cmd == cmd)
87 			return &api_info[i];
88 	return NULL;
89 }
90 
91 /* Call with buf of n*11+1 bytes */
92 static char *u32arr2hex(u32 data[], int n, char *buf)
93 {
94 	char *p;
95 	int i;
96 
97 	for (i = 0, p = buf; i < n; i++, p += 11) {
98 		/* kernel snprintf() appends '\0' always */
99 		snprintf(p, 12, " %#010x", data[i]);
100 	}
101 	*p = '\0';
102 	return buf;
103 }
104 
105 static void dump_mb(struct cx18 *cx, struct cx18_mailbox *mb, char *name)
106 {
107 	char argstr[MAX_MB_ARGUMENTS*11+1];
108 
109 	if (!(cx18_debug & CX18_DBGFLG_API))
110 		return;
111 
112 	CX18_DEBUG_API("%s: req %#010x ack %#010x cmd %#010x err %#010x args%s\n",
113 		       name, mb->request, mb->ack, mb->cmd, mb->error,
114 		       u32arr2hex(mb->args, MAX_MB_ARGUMENTS, argstr));
115 }
116 
117 
118 /*
119  * Functions that run in a work_queue work handling context
120  */
121 
122 static void cx18_mdl_send_to_dvb(struct cx18_stream *s, struct cx18_mdl *mdl)
123 {
124 	struct cx18_buffer *buf;
125 
126 	if (s->dvb == NULL || !s->dvb->enabled || mdl->bytesused == 0)
127 		return;
128 
129 	/* We ignore mdl and buf readpos accounting here - it doesn't matter */
130 
131 	/* The likely case */
132 	if (list_is_singular(&mdl->buf_list)) {
133 		buf = list_first_entry(&mdl->buf_list, struct cx18_buffer,
134 				       list);
135 		if (buf->bytesused)
136 			dvb_dmx_swfilter(&s->dvb->demux,
137 					 buf->buf, buf->bytesused);
138 		return;
139 	}
140 
141 	list_for_each_entry(buf, &mdl->buf_list, list) {
142 		if (buf->bytesused == 0)
143 			break;
144 		dvb_dmx_swfilter(&s->dvb->demux, buf->buf, buf->bytesused);
145 	}
146 }
147 
148 static void cx18_mdl_send_to_videobuf(struct cx18_stream *s,
149 	struct cx18_mdl *mdl)
150 {
151 	struct cx18_videobuf_buffer *vb_buf;
152 	struct cx18_buffer *buf;
153 	u8 *p;
154 	u32 offset = 0;
155 	int dispatch = 0;
156 
157 	if (mdl->bytesused == 0)
158 		return;
159 
160 	/* Acquire a videobuf buffer, clone to and and release it */
161 	spin_lock(&s->vb_lock);
162 	if (list_empty(&s->vb_capture))
163 		goto out;
164 
165 	vb_buf = list_first_entry(&s->vb_capture, struct cx18_videobuf_buffer,
166 		vb.queue);
167 
168 	p = videobuf_to_vmalloc(&vb_buf->vb);
169 	if (!p)
170 		goto out;
171 
172 	offset = vb_buf->bytes_used;
173 	list_for_each_entry(buf, &mdl->buf_list, list) {
174 		if (buf->bytesused == 0)
175 			break;
176 
177 		if ((offset + buf->bytesused) <= vb_buf->vb.bsize) {
178 			memcpy(p + offset, buf->buf, buf->bytesused);
179 			offset += buf->bytesused;
180 			vb_buf->bytes_used += buf->bytesused;
181 		}
182 	}
183 
184 	/* If we've filled the buffer as per the callers res then dispatch it */
185 	if (vb_buf->bytes_used >= s->vb_bytes_per_frame) {
186 		dispatch = 1;
187 		vb_buf->bytes_used = 0;
188 	}
189 
190 	if (dispatch) {
191 		vb_buf->vb.ts = ktime_get_ns();
192 		list_del(&vb_buf->vb.queue);
193 		vb_buf->vb.state = VIDEOBUF_DONE;
194 		wake_up(&vb_buf->vb.done);
195 	}
196 
197 	mod_timer(&s->vb_timeout, msecs_to_jiffies(2000) + jiffies);
198 
199 out:
200 	spin_unlock(&s->vb_lock);
201 }
202 
203 static void cx18_mdl_send_to_alsa(struct cx18 *cx, struct cx18_stream *s,
204 				  struct cx18_mdl *mdl)
205 {
206 	struct cx18_buffer *buf;
207 
208 	if (mdl->bytesused == 0)
209 		return;
210 
211 	/* We ignore mdl and buf readpos accounting here - it doesn't matter */
212 
213 	/* The likely case */
214 	if (list_is_singular(&mdl->buf_list)) {
215 		buf = list_first_entry(&mdl->buf_list, struct cx18_buffer,
216 				       list);
217 		if (buf->bytesused)
218 			cx->pcm_announce_callback(cx->alsa, buf->buf,
219 						  buf->bytesused);
220 		return;
221 	}
222 
223 	list_for_each_entry(buf, &mdl->buf_list, list) {
224 		if (buf->bytesused == 0)
225 			break;
226 		cx->pcm_announce_callback(cx->alsa, buf->buf, buf->bytesused);
227 	}
228 }
229 
230 static void epu_dma_done(struct cx18 *cx, struct cx18_in_work_order *order)
231 {
232 	u32 handle, mdl_ack_count, id;
233 	struct cx18_mailbox *mb;
234 	struct cx18_mdl_ack *mdl_ack;
235 	struct cx18_stream *s;
236 	struct cx18_mdl *mdl;
237 	int i;
238 
239 	mb = &order->mb;
240 	handle = mb->args[0];
241 	s = cx18_handle_to_stream(cx, handle);
242 
243 	if (s == NULL) {
244 		CX18_WARN("Got DMA done notification for unknown/inactive handle %d, %s mailbox seq no %d\n",
245 			  handle,
246 			  (order->flags & CX18_F_EWO_MB_STALE_UPON_RECEIPT) ?
247 			  "stale" : "good", mb->request);
248 		return;
249 	}
250 
251 	mdl_ack_count = mb->args[2];
252 	mdl_ack = order->mdl_ack;
253 	for (i = 0; i < mdl_ack_count; i++, mdl_ack++) {
254 		id = mdl_ack->id;
255 		/*
256 		 * Simple integrity check for processing a stale (and possibly
257 		 * inconsistent mailbox): make sure the MDL id is in the
258 		 * valid range for the stream.
259 		 *
260 		 * We go through the trouble of dealing with stale mailboxes
261 		 * because most of the time, the mailbox data is still valid and
262 		 * unchanged (and in practice the firmware ping-pongs the
263 		 * two mdl_ack buffers so mdl_acks are not stale).
264 		 *
265 		 * There are occasions when we get a half changed mailbox,
266 		 * which this check catches for a handle & id mismatch.  If the
267 		 * handle and id do correspond, the worst case is that we
268 		 * completely lost the old MDL, but pick up the new MDL
269 		 * early (but the new mdl_ack is guaranteed to be good in this
270 		 * case as the firmware wouldn't point us to a new mdl_ack until
271 		 * it's filled in).
272 		 *
273 		 * cx18_queue_get_mdl() will detect the lost MDLs
274 		 * and send them back to q_free for fw rotation eventually.
275 		 */
276 		if ((order->flags & CX18_F_EWO_MB_STALE_UPON_RECEIPT) &&
277 		    !(id >= s->mdl_base_idx &&
278 		      id < (s->mdl_base_idx + s->buffers))) {
279 			CX18_WARN("Fell behind! Ignoring stale mailbox with  inconsistent data. Lost MDL for mailbox seq no %d\n",
280 				  mb->request);
281 			break;
282 		}
283 		mdl = cx18_queue_get_mdl(s, id, mdl_ack->data_used);
284 
285 		CX18_DEBUG_HI_DMA("DMA DONE for %s (MDL %d)\n", s->name, id);
286 		if (mdl == NULL) {
287 			CX18_WARN("Could not find MDL %d for stream %s\n",
288 				  id, s->name);
289 			continue;
290 		}
291 
292 		CX18_DEBUG_HI_DMA("%s recv bytesused = %d\n",
293 				  s->name, mdl->bytesused);
294 
295 		if (s->type == CX18_ENC_STREAM_TYPE_TS) {
296 			cx18_mdl_send_to_dvb(s, mdl);
297 			cx18_enqueue(s, mdl, &s->q_free);
298 		} else if (s->type == CX18_ENC_STREAM_TYPE_PCM) {
299 			/* Pass the data to cx18-alsa */
300 			if (cx->pcm_announce_callback != NULL) {
301 				cx18_mdl_send_to_alsa(cx, s, mdl);
302 				cx18_enqueue(s, mdl, &s->q_free);
303 			} else {
304 				cx18_enqueue(s, mdl, &s->q_full);
305 			}
306 		} else if (s->type == CX18_ENC_STREAM_TYPE_YUV) {
307 			cx18_mdl_send_to_videobuf(s, mdl);
308 			cx18_enqueue(s, mdl, &s->q_free);
309 		} else {
310 			cx18_enqueue(s, mdl, &s->q_full);
311 			if (s->type == CX18_ENC_STREAM_TYPE_IDX)
312 				cx18_stream_rotate_idx_mdls(cx);
313 		}
314 	}
315 	/* Put as many MDLs as possible back into fw use */
316 	cx18_stream_load_fw_queue(s);
317 
318 	wake_up(&cx->dma_waitq);
319 	if (s->id != -1)
320 		wake_up(&s->waitq);
321 }
322 
323 static void epu_debug(struct cx18 *cx, struct cx18_in_work_order *order)
324 {
325 	char *p;
326 	char *str = order->str;
327 
328 	CX18_DEBUG_INFO("%x %s\n", order->mb.args[0], str);
329 	p = strchr(str, '.');
330 	if (!test_bit(CX18_F_I_LOADED_FW, &cx->i_flags) && p && p > str)
331 		CX18_INFO("FW version: %s\n", p - 1);
332 }
333 
334 static void epu_cmd(struct cx18 *cx, struct cx18_in_work_order *order)
335 {
336 	switch (order->rpu) {
337 	case CPU:
338 	{
339 		switch (order->mb.cmd) {
340 		case CX18_EPU_DMA_DONE:
341 			epu_dma_done(cx, order);
342 			break;
343 		case CX18_EPU_DEBUG:
344 			epu_debug(cx, order);
345 			break;
346 		default:
347 			CX18_WARN("Unknown CPU to EPU mailbox command %#0x\n",
348 				  order->mb.cmd);
349 			break;
350 		}
351 		break;
352 	}
353 	case APU:
354 		CX18_WARN("Unknown APU to EPU mailbox command %#0x\n",
355 			  order->mb.cmd);
356 		break;
357 	default:
358 		break;
359 	}
360 }
361 
362 static
363 void free_in_work_order(struct cx18 *cx, struct cx18_in_work_order *order)
364 {
365 	atomic_set(&order->pending, 0);
366 }
367 
368 void cx18_in_work_handler(struct work_struct *work)
369 {
370 	struct cx18_in_work_order *order =
371 			container_of(work, struct cx18_in_work_order, work);
372 	struct cx18 *cx = order->cx;
373 	epu_cmd(cx, order);
374 	free_in_work_order(cx, order);
375 }
376 
377 
378 /*
379  * Functions that run in an interrupt handling context
380  */
381 
382 static void mb_ack_irq(struct cx18 *cx, struct cx18_in_work_order *order)
383 {
384 	struct cx18_mailbox __iomem *ack_mb;
385 	u32 ack_irq, req;
386 
387 	switch (order->rpu) {
388 	case APU:
389 		ack_irq = IRQ_EPU_TO_APU_ACK;
390 		ack_mb = &cx->scb->apu2epu_mb;
391 		break;
392 	case CPU:
393 		ack_irq = IRQ_EPU_TO_CPU_ACK;
394 		ack_mb = &cx->scb->cpu2epu_mb;
395 		break;
396 	default:
397 		CX18_WARN("Unhandled RPU (%d) for command %x ack\n",
398 			  order->rpu, order->mb.cmd);
399 		return;
400 	}
401 
402 	req = order->mb.request;
403 	/* Don't ack if the RPU has gotten impatient and timed us out */
404 	if (req != cx18_readl(cx, &ack_mb->request) ||
405 	    req == cx18_readl(cx, &ack_mb->ack)) {
406 		CX18_DEBUG_WARN("Possibly falling behind: %s self-ack'ed our incoming %s to EPU mailbox (sequence no. %u) while processing\n",
407 				rpu_str[order->rpu], rpu_str[order->rpu], req);
408 		order->flags |= CX18_F_EWO_MB_STALE_WHILE_PROC;
409 		return;
410 	}
411 	cx18_writel(cx, req, &ack_mb->ack);
412 	cx18_write_reg_expect(cx, ack_irq, SW2_INT_SET, ack_irq, ack_irq);
413 	return;
414 }
415 
416 static int epu_dma_done_irq(struct cx18 *cx, struct cx18_in_work_order *order)
417 {
418 	u32 handle, mdl_ack_offset, mdl_ack_count;
419 	struct cx18_mailbox *mb;
420 	int i;
421 
422 	mb = &order->mb;
423 	handle = mb->args[0];
424 	mdl_ack_offset = mb->args[1];
425 	mdl_ack_count = mb->args[2];
426 
427 	if (handle == CX18_INVALID_TASK_HANDLE ||
428 	    mdl_ack_count == 0 || mdl_ack_count > CX18_MAX_MDL_ACKS) {
429 		if ((order->flags & CX18_F_EWO_MB_STALE) == 0)
430 			mb_ack_irq(cx, order);
431 		return -1;
432 	}
433 
434 	for (i = 0; i < sizeof(struct cx18_mdl_ack) * mdl_ack_count; i += sizeof(u32))
435 		((u32 *)order->mdl_ack)[i / sizeof(u32)] =
436 			cx18_readl(cx, cx->enc_mem + mdl_ack_offset + i);
437 
438 	if ((order->flags & CX18_F_EWO_MB_STALE) == 0)
439 		mb_ack_irq(cx, order);
440 	return 1;
441 }
442 
443 static
444 int epu_debug_irq(struct cx18 *cx, struct cx18_in_work_order *order)
445 {
446 	u32 str_offset;
447 	char *str = order->str;
448 
449 	str[0] = '\0';
450 	str_offset = order->mb.args[1];
451 	if (str_offset) {
452 		cx18_setup_page(cx, str_offset);
453 		cx18_memcpy_fromio(cx, str, cx->enc_mem + str_offset, 252);
454 		str[252] = '\0';
455 		cx18_setup_page(cx, SCB_OFFSET);
456 	}
457 
458 	if ((order->flags & CX18_F_EWO_MB_STALE) == 0)
459 		mb_ack_irq(cx, order);
460 
461 	return str_offset ? 1 : 0;
462 }
463 
464 static inline
465 int epu_cmd_irq(struct cx18 *cx, struct cx18_in_work_order *order)
466 {
467 	int ret = -1;
468 
469 	switch (order->rpu) {
470 	case CPU:
471 	{
472 		switch (order->mb.cmd) {
473 		case CX18_EPU_DMA_DONE:
474 			ret = epu_dma_done_irq(cx, order);
475 			break;
476 		case CX18_EPU_DEBUG:
477 			ret = epu_debug_irq(cx, order);
478 			break;
479 		default:
480 			CX18_WARN("Unknown CPU to EPU mailbox command %#0x\n",
481 				  order->mb.cmd);
482 			break;
483 		}
484 		break;
485 	}
486 	case APU:
487 		CX18_WARN("Unknown APU to EPU mailbox command %#0x\n",
488 			  order->mb.cmd);
489 		break;
490 	default:
491 		break;
492 	}
493 	return ret;
494 }
495 
496 static inline
497 struct cx18_in_work_order *alloc_in_work_order_irq(struct cx18 *cx)
498 {
499 	int i;
500 	struct cx18_in_work_order *order = NULL;
501 
502 	for (i = 0; i < CX18_MAX_IN_WORK_ORDERS; i++) {
503 		/*
504 		 * We only need "pending" atomic to inspect its contents,
505 		 * and need not do a check and set because:
506 		 * 1. Any work handler thread only clears "pending" and only
507 		 * on one, particular work order at a time, per handler thread.
508 		 * 2. "pending" is only set here, and we're serialized because
509 		 * we're called in an IRQ handler context.
510 		 */
511 		if (atomic_read(&cx->in_work_order[i].pending) == 0) {
512 			order = &cx->in_work_order[i];
513 			atomic_set(&order->pending, 1);
514 			break;
515 		}
516 	}
517 	return order;
518 }
519 
520 void cx18_api_epu_cmd_irq(struct cx18 *cx, int rpu)
521 {
522 	struct cx18_mailbox __iomem *mb;
523 	struct cx18_mailbox *order_mb;
524 	struct cx18_in_work_order *order;
525 	int submit;
526 	int i;
527 
528 	switch (rpu) {
529 	case CPU:
530 		mb = &cx->scb->cpu2epu_mb;
531 		break;
532 	case APU:
533 		mb = &cx->scb->apu2epu_mb;
534 		break;
535 	default:
536 		return;
537 	}
538 
539 	order = alloc_in_work_order_irq(cx);
540 	if (order == NULL) {
541 		CX18_WARN("Unable to find blank work order form to schedule incoming mailbox command processing\n");
542 		return;
543 	}
544 
545 	order->flags = 0;
546 	order->rpu = rpu;
547 	order_mb = &order->mb;
548 
549 	/* mb->cmd and mb->args[0] through mb->args[2] */
550 	for (i = 0; i < 4; i++)
551 		(&order_mb->cmd)[i] = cx18_readl(cx, &mb->cmd + i);
552 
553 	/* mb->request and mb->ack.  N.B. we want to read mb->ack last */
554 	for (i = 0; i < 2; i++)
555 		(&order_mb->request)[i] = cx18_readl(cx, &mb->request + i);
556 
557 	if (order_mb->request == order_mb->ack) {
558 		CX18_DEBUG_WARN("Possibly falling behind: %s self-ack'ed our incoming %s to EPU mailbox (sequence no. %u)\n",
559 				rpu_str[rpu], rpu_str[rpu], order_mb->request);
560 		if (cx18_debug & CX18_DBGFLG_WARN)
561 			dump_mb(cx, order_mb, "incoming");
562 		order->flags = CX18_F_EWO_MB_STALE_UPON_RECEIPT;
563 	}
564 
565 	/*
566 	 * Individual EPU command processing is responsible for ack-ing
567 	 * a non-stale mailbox as soon as possible
568 	 */
569 	submit = epu_cmd_irq(cx, order);
570 	if (submit > 0) {
571 		queue_work(cx->in_work_queue, &order->work);
572 	}
573 }
574 
575 
576 /*
577  * Functions called from a non-interrupt, non work_queue context
578  */
579 
580 static int cx18_api_call(struct cx18 *cx, u32 cmd, int args, u32 data[])
581 {
582 	const struct cx18_api_info *info = find_api_info(cmd);
583 	u32 irq, req, ack, err;
584 	struct cx18_mailbox __iomem *mb;
585 	wait_queue_head_t *waitq;
586 	struct mutex *mb_lock;
587 	unsigned long int t0, timeout, ret;
588 	int i;
589 	char argstr[MAX_MB_ARGUMENTS*11+1];
590 	DEFINE_WAIT(w);
591 
592 	if (info == NULL) {
593 		CX18_WARN("unknown cmd %x\n", cmd);
594 		return -EINVAL;
595 	}
596 
597 	if (cx18_debug & CX18_DBGFLG_API) { /* only call u32arr2hex if needed */
598 		if (cmd == CX18_CPU_DE_SET_MDL) {
599 			if (cx18_debug & CX18_DBGFLG_HIGHVOL)
600 				CX18_DEBUG_HI_API("%s\tcmd %#010x args%s\n",
601 						info->name, cmd,
602 						u32arr2hex(data, args, argstr));
603 		} else
604 			CX18_DEBUG_API("%s\tcmd %#010x args%s\n",
605 				       info->name, cmd,
606 				       u32arr2hex(data, args, argstr));
607 	}
608 
609 	switch (info->rpu) {
610 	case APU:
611 		waitq = &cx->mb_apu_waitq;
612 		mb_lock = &cx->epu2apu_mb_lock;
613 		irq = IRQ_EPU_TO_APU;
614 		mb = &cx->scb->epu2apu_mb;
615 		break;
616 	case CPU:
617 		waitq = &cx->mb_cpu_waitq;
618 		mb_lock = &cx->epu2cpu_mb_lock;
619 		irq = IRQ_EPU_TO_CPU;
620 		mb = &cx->scb->epu2cpu_mb;
621 		break;
622 	default:
623 		CX18_WARN("Unknown RPU (%d) for API call\n", info->rpu);
624 		return -EINVAL;
625 	}
626 
627 	mutex_lock(mb_lock);
628 	/*
629 	 * Wait for an in-use mailbox to complete
630 	 *
631 	 * If the XPU is responding with Ack's, the mailbox shouldn't be in
632 	 * a busy state, since we serialize access to it on our end.
633 	 *
634 	 * If the wait for ack after sending a previous command was interrupted
635 	 * by a signal, we may get here and find a busy mailbox.  After waiting,
636 	 * mark it "not busy" from our end, if the XPU hasn't ack'ed it still.
637 	 */
638 	req = cx18_readl(cx, &mb->request);
639 	timeout = msecs_to_jiffies(10);
640 	ret = wait_event_timeout(*waitq,
641 				 (ack = cx18_readl(cx, &mb->ack)) == req,
642 				 timeout);
643 	if (req != ack) {
644 		/* waited long enough, make the mbox "not busy" from our end */
645 		cx18_writel(cx, req, &mb->ack);
646 		CX18_ERR("mbox was found stuck busy when setting up for %s; clearing busy and trying to proceed\n",
647 			 info->name);
648 	} else if (ret != timeout)
649 		CX18_DEBUG_API("waited %u msecs for busy mbox to be acked\n",
650 			       jiffies_to_msecs(timeout-ret));
651 
652 	/* Build the outgoing mailbox */
653 	req = ((req & 0xfffffffe) == 0xfffffffe) ? 1 : req + 1;
654 
655 	cx18_writel(cx, cmd, &mb->cmd);
656 	for (i = 0; i < args; i++)
657 		cx18_writel(cx, data[i], &mb->args[i]);
658 	cx18_writel(cx, 0, &mb->error);
659 	cx18_writel(cx, req, &mb->request);
660 	cx18_writel(cx, req - 1, &mb->ack); /* ensure ack & req are distinct */
661 
662 	/*
663 	 * Notify the XPU and wait for it to send an Ack back
664 	 */
665 	timeout = msecs_to_jiffies((info->flags & API_FAST) ? 10 : 20);
666 
667 	CX18_DEBUG_HI_IRQ("sending interrupt SW1: %x to send %s\n",
668 			  irq, info->name);
669 
670 	/* So we don't miss the wakeup, prepare to wait before notifying fw */
671 	prepare_to_wait(waitq, &w, TASK_UNINTERRUPTIBLE);
672 	cx18_write_reg_expect(cx, irq, SW1_INT_SET, irq, irq);
673 
674 	t0 = jiffies;
675 	ack = cx18_readl(cx, &mb->ack);
676 	if (ack != req) {
677 		schedule_timeout(timeout);
678 		ret = jiffies - t0;
679 		ack = cx18_readl(cx, &mb->ack);
680 	} else {
681 		ret = jiffies - t0;
682 	}
683 
684 	finish_wait(waitq, &w);
685 
686 	if (req != ack) {
687 		mutex_unlock(mb_lock);
688 		if (ret >= timeout) {
689 			/* Timed out */
690 			CX18_DEBUG_WARN("sending %s timed out waiting %d msecs for RPU acknowledgment\n",
691 					info->name, jiffies_to_msecs(ret));
692 		} else {
693 			CX18_DEBUG_WARN("woken up before mailbox ack was ready after submitting %s to RPU.  only waited %d msecs on req %u but awakened with unmatched ack %u\n",
694 					info->name,
695 					jiffies_to_msecs(ret),
696 					req, ack);
697 		}
698 		return -EINVAL;
699 	}
700 
701 	if (ret >= timeout)
702 		CX18_DEBUG_WARN("failed to be awakened upon RPU acknowledgment sending %s; timed out waiting %d msecs\n",
703 				info->name, jiffies_to_msecs(ret));
704 	else
705 		CX18_DEBUG_HI_API("waited %u msecs for %s to be acked\n",
706 				  jiffies_to_msecs(ret), info->name);
707 
708 	/* Collect data returned by the XPU */
709 	for (i = 0; i < MAX_MB_ARGUMENTS; i++)
710 		data[i] = cx18_readl(cx, &mb->args[i]);
711 	err = cx18_readl(cx, &mb->error);
712 	mutex_unlock(mb_lock);
713 
714 	/*
715 	 * Wait for XPU to perform extra actions for the caller in some cases.
716 	 * e.g. CX18_CPU_DE_RELEASE_MDL will cause the CPU to send all MDLs
717 	 * back in a burst shortly thereafter
718 	 */
719 	if (info->flags & API_SLOW)
720 		cx18_msleep_timeout(300, 0);
721 
722 	if (err)
723 		CX18_DEBUG_API("mailbox error %08x for command %s\n", err,
724 				info->name);
725 	return err ? -EIO : 0;
726 }
727 
728 int cx18_api(struct cx18 *cx, u32 cmd, int args, u32 data[])
729 {
730 	return cx18_api_call(cx, cmd, args, data);
731 }
732 
733 static int cx18_set_filter_param(struct cx18_stream *s)
734 {
735 	struct cx18 *cx = s->cx;
736 	u32 mode;
737 	int ret;
738 
739 	mode = (cx->filter_mode & 1) ? 2 : (cx->spatial_strength ? 1 : 0);
740 	ret = cx18_vapi(cx, CX18_CPU_SET_FILTER_PARAM, 4,
741 			s->handle, 1, mode, cx->spatial_strength);
742 	mode = (cx->filter_mode & 2) ? 2 : (cx->temporal_strength ? 1 : 0);
743 	ret = ret ? ret : cx18_vapi(cx, CX18_CPU_SET_FILTER_PARAM, 4,
744 			s->handle, 0, mode, cx->temporal_strength);
745 	ret = ret ? ret : cx18_vapi(cx, CX18_CPU_SET_FILTER_PARAM, 4,
746 			s->handle, 2, cx->filter_mode >> 2, 0);
747 	return ret;
748 }
749 
750 int cx18_api_func(void *priv, u32 cmd, int in, int out,
751 		u32 data[CX2341X_MBOX_MAX_DATA])
752 {
753 	struct cx18_stream *s = priv;
754 	struct cx18 *cx = s->cx;
755 
756 	switch (cmd) {
757 	case CX2341X_ENC_SET_OUTPUT_PORT:
758 		return 0;
759 	case CX2341X_ENC_SET_FRAME_RATE:
760 		return cx18_vapi(cx, CX18_CPU_SET_VIDEO_IN, 6,
761 				s->handle, 0, 0, 0, 0, data[0]);
762 	case CX2341X_ENC_SET_FRAME_SIZE:
763 		return cx18_vapi(cx, CX18_CPU_SET_VIDEO_RESOLUTION, 3,
764 				s->handle, data[1], data[0]);
765 	case CX2341X_ENC_SET_STREAM_TYPE:
766 		return cx18_vapi(cx, CX18_CPU_SET_STREAM_OUTPUT_TYPE, 2,
767 				s->handle, data[0]);
768 	case CX2341X_ENC_SET_ASPECT_RATIO:
769 		return cx18_vapi(cx, CX18_CPU_SET_ASPECT_RATIO, 2,
770 				s->handle, data[0]);
771 
772 	case CX2341X_ENC_SET_GOP_PROPERTIES:
773 		return cx18_vapi(cx, CX18_CPU_SET_GOP_STRUCTURE, 3,
774 				s->handle, data[0], data[1]);
775 	case CX2341X_ENC_SET_GOP_CLOSURE:
776 		return 0;
777 	case CX2341X_ENC_SET_AUDIO_PROPERTIES:
778 		return cx18_vapi(cx, CX18_CPU_SET_AUDIO_PARAMETERS, 2,
779 				s->handle, data[0]);
780 	case CX2341X_ENC_MUTE_AUDIO:
781 		return cx18_vapi(cx, CX18_CPU_SET_AUDIO_MUTE, 2,
782 				s->handle, data[0]);
783 	case CX2341X_ENC_SET_BIT_RATE:
784 		return cx18_vapi(cx, CX18_CPU_SET_VIDEO_RATE, 5,
785 				s->handle, data[0], data[1], data[2], data[3]);
786 	case CX2341X_ENC_MUTE_VIDEO:
787 		return cx18_vapi(cx, CX18_CPU_SET_VIDEO_MUTE, 2,
788 				s->handle, data[0]);
789 	case CX2341X_ENC_SET_FRAME_DROP_RATE:
790 		return cx18_vapi(cx, CX18_CPU_SET_SKIP_INPUT_FRAME, 2,
791 				s->handle, data[0]);
792 	case CX2341X_ENC_MISC:
793 		return cx18_vapi(cx, CX18_CPU_SET_MISC_PARAMETERS, 4,
794 				s->handle, data[0], data[1], data[2]);
795 	case CX2341X_ENC_SET_DNR_FILTER_MODE:
796 		cx->filter_mode = (data[0] & 3) | (data[1] << 2);
797 		return cx18_set_filter_param(s);
798 	case CX2341X_ENC_SET_DNR_FILTER_PROPS:
799 		cx->spatial_strength = data[0];
800 		cx->temporal_strength = data[1];
801 		return cx18_set_filter_param(s);
802 	case CX2341X_ENC_SET_SPATIAL_FILTER_TYPE:
803 		return cx18_vapi(cx, CX18_CPU_SET_SPATIAL_FILTER_TYPE, 3,
804 				s->handle, data[0], data[1]);
805 	case CX2341X_ENC_SET_CORING_LEVELS:
806 		return cx18_vapi(cx, CX18_CPU_SET_MEDIAN_CORING, 5,
807 				s->handle, data[0], data[1], data[2], data[3]);
808 	}
809 	CX18_WARN("Unknown cmd %x\n", cmd);
810 	return 0;
811 }
812 
813 int cx18_vapi_result(struct cx18 *cx, u32 data[MAX_MB_ARGUMENTS],
814 		u32 cmd, int args, ...)
815 {
816 	va_list ap;
817 	int i;
818 
819 	va_start(ap, args);
820 	for (i = 0; i < args; i++)
821 		data[i] = va_arg(ap, u32);
822 	va_end(ap);
823 	return cx18_api(cx, cmd, args, data);
824 }
825 
826 int cx18_vapi(struct cx18 *cx, u32 cmd, int args, ...)
827 {
828 	u32 data[MAX_MB_ARGUMENTS];
829 	va_list ap;
830 	int i;
831 
832 	if (cx == NULL) {
833 		CX18_ERR("cx == NULL (cmd=%x)\n", cmd);
834 		return 0;
835 	}
836 	if (args > MAX_MB_ARGUMENTS) {
837 		CX18_ERR("args too big (cmd=%x)\n", cmd);
838 		args = MAX_MB_ARGUMENTS;
839 	}
840 	va_start(ap, args);
841 	for (i = 0; i < args; i++)
842 		data[i] = va_arg(ap, u32);
843 	va_end(ap);
844 	return cx18_api(cx, cmd, args, data);
845 }
846