Merge tag 'arc-5.5-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc
[sfrench/cifs-2.6.git] / drivers / media / pci / cx18 / cx18-mailbox.c
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 }