blob: 8f85719212f96283351a9381a2419afc8adf2d96 [file] [log] [blame]
Guennadi Liakhovetski895d4502010-01-22 19:09:03 +01001/*
2 * siu_pcm.c - ALSA driver for Renesas SH7343, SH7722 SIU peripheral.
3 *
4 * Copyright (C) 2009-2010 Guennadi Liakhovetski <g.liakhovetski@gmx.de>
5 * Copyright (C) 2006 Carlos Munoz <carlos@kenati.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 */
21#include <linux/delay.h>
22#include <linux/dma-mapping.h>
23#include <linux/dmaengine.h>
24#include <linux/interrupt.h>
25#include <linux/module.h>
26#include <linux/platform_device.h>
Guennadi Liakhovetski895d4502010-01-22 19:09:03 +010027
28#include <sound/control.h>
29#include <sound/core.h>
30#include <sound/pcm.h>
31#include <sound/pcm_params.h>
32#include <sound/soc-dai.h>
33
Guennadi Liakhovetski8b1935e2010-02-11 16:50:14 +000034#include <asm/dmaengine.h>
Guennadi Liakhovetski895d4502010-01-22 19:09:03 +010035#include <asm/siu.h>
36
37#include "siu.h"
38
39#define GET_MAX_PERIODS(buf_bytes, period_bytes) \
40 ((buf_bytes) / (period_bytes))
41#define PERIOD_OFFSET(buf_addr, period_num, period_bytes) \
42 ((buf_addr) + ((period_num) * (period_bytes)))
43
44#define RWF_STM_RD 0x01 /* Read in progress */
45#define RWF_STM_WT 0x02 /* Write in progress */
46
47struct siu_port *siu_ports[SIU_PORT_NUM];
48
49/* transfersize is number of u32 dma transfers per period */
50static int siu_pcm_stmwrite_stop(struct siu_port *port_info)
51{
52 struct siu_info *info = siu_i2s_dai.private_data;
53 u32 __iomem *base = info->reg;
54 struct siu_stream *siu_stream = &port_info->playback;
55 u32 stfifo;
56
57 if (!siu_stream->rw_flg)
58 return -EPERM;
59
60 /* output FIFO disable */
61 stfifo = siu_read32(base + SIU_STFIFO);
62 siu_write32(base + SIU_STFIFO, stfifo & ~0x0c180c18);
63 pr_debug("%s: STFIFO %x -> %x\n", __func__,
64 stfifo, stfifo & ~0x0c180c18);
65
66 /* during stmwrite clear */
67 siu_stream->rw_flg = 0;
68
69 return 0;
70}
71
72static int siu_pcm_stmwrite_start(struct siu_port *port_info)
73{
74 struct siu_stream *siu_stream = &port_info->playback;
75
76 if (siu_stream->rw_flg)
77 return -EPERM;
78
79 /* Current period in buffer */
80 port_info->playback.cur_period = 0;
81
82 /* during stmwrite flag set */
83 siu_stream->rw_flg = RWF_STM_WT;
84
85 /* DMA transfer start */
86 tasklet_schedule(&siu_stream->tasklet);
87
88 return 0;
89}
90
91static void siu_dma_tx_complete(void *arg)
92{
93 struct siu_stream *siu_stream = arg;
94
95 if (!siu_stream->rw_flg)
96 return;
97
98 /* Update completed period count */
99 if (++siu_stream->cur_period >=
100 GET_MAX_PERIODS(siu_stream->buf_bytes,
101 siu_stream->period_bytes))
102 siu_stream->cur_period = 0;
103
104 pr_debug("%s: done period #%d (%u/%u bytes), cookie %d\n",
105 __func__, siu_stream->cur_period,
106 siu_stream->cur_period * siu_stream->period_bytes,
107 siu_stream->buf_bytes, siu_stream->cookie);
108
109 tasklet_schedule(&siu_stream->tasklet);
110
111 /* Notify alsa: a period is done */
112 snd_pcm_period_elapsed(siu_stream->substream);
113}
114
115static int siu_pcm_wr_set(struct siu_port *port_info,
116 dma_addr_t buff, u32 size)
117{
118 struct siu_info *info = siu_i2s_dai.private_data;
119 u32 __iomem *base = info->reg;
120 struct siu_stream *siu_stream = &port_info->playback;
121 struct snd_pcm_substream *substream = siu_stream->substream;
122 struct device *dev = substream->pcm->card->dev;
123 struct dma_async_tx_descriptor *desc;
124 dma_cookie_t cookie;
125 struct scatterlist sg;
126 u32 stfifo;
127
128 sg_init_table(&sg, 1);
129 sg_set_page(&sg, pfn_to_page(PFN_DOWN(buff)),
130 size, offset_in_page(buff));
131 sg_dma_address(&sg) = buff;
132
133 desc = siu_stream->chan->device->device_prep_slave_sg(siu_stream->chan,
134 &sg, 1, DMA_TO_DEVICE, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
135 if (!desc) {
136 dev_err(dev, "Failed to allocate a dma descriptor\n");
137 return -ENOMEM;
138 }
139
140 desc->callback = siu_dma_tx_complete;
141 desc->callback_param = siu_stream;
142 cookie = desc->tx_submit(desc);
143 if (cookie < 0) {
144 dev_err(dev, "Failed to submit a dma transfer\n");
145 return cookie;
146 }
147
148 siu_stream->tx_desc = desc;
149 siu_stream->cookie = cookie;
150
151 dma_async_issue_pending(siu_stream->chan);
152
153 /* only output FIFO enable */
154 stfifo = siu_read32(base + SIU_STFIFO);
155 siu_write32(base + SIU_STFIFO, stfifo | (port_info->stfifo & 0x0c180c18));
156 dev_dbg(dev, "%s: STFIFO %x -> %x\n", __func__,
157 stfifo, stfifo | (port_info->stfifo & 0x0c180c18));
158
159 return 0;
160}
161
162static int siu_pcm_rd_set(struct siu_port *port_info,
163 dma_addr_t buff, size_t size)
164{
165 struct siu_info *info = siu_i2s_dai.private_data;
166 u32 __iomem *base = info->reg;
167 struct siu_stream *siu_stream = &port_info->capture;
168 struct snd_pcm_substream *substream = siu_stream->substream;
169 struct device *dev = substream->pcm->card->dev;
170 struct dma_async_tx_descriptor *desc;
171 dma_cookie_t cookie;
172 struct scatterlist sg;
173 u32 stfifo;
174
175 dev_dbg(dev, "%s: %u@%llx\n", __func__, size, (unsigned long long)buff);
176
177 sg_init_table(&sg, 1);
178 sg_set_page(&sg, pfn_to_page(PFN_DOWN(buff)),
179 size, offset_in_page(buff));
180 sg_dma_address(&sg) = buff;
181
182 desc = siu_stream->chan->device->device_prep_slave_sg(siu_stream->chan,
183 &sg, 1, DMA_FROM_DEVICE, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
184 if (!desc) {
185 dev_err(dev, "Failed to allocate dma descriptor\n");
186 return -ENOMEM;
187 }
188
189 desc->callback = siu_dma_tx_complete;
190 desc->callback_param = siu_stream;
191 cookie = desc->tx_submit(desc);
192 if (cookie < 0) {
193 dev_err(dev, "Failed to submit dma descriptor\n");
194 return cookie;
195 }
196
197 siu_stream->tx_desc = desc;
198 siu_stream->cookie = cookie;
199
200 dma_async_issue_pending(siu_stream->chan);
201
202 /* only input FIFO enable */
203 stfifo = siu_read32(base + SIU_STFIFO);
204 siu_write32(base + SIU_STFIFO, siu_read32(base + SIU_STFIFO) |
205 (port_info->stfifo & 0x13071307));
206 dev_dbg(dev, "%s: STFIFO %x -> %x\n", __func__,
207 stfifo, stfifo | (port_info->stfifo & 0x13071307));
208
209 return 0;
210}
211
212static void siu_io_tasklet(unsigned long data)
213{
214 struct siu_stream *siu_stream = (struct siu_stream *)data;
215 struct snd_pcm_substream *substream = siu_stream->substream;
216 struct device *dev = substream->pcm->card->dev;
217 struct snd_pcm_runtime *rt = substream->runtime;
218 struct siu_port *port_info = siu_port_info(substream);
219
220 dev_dbg(dev, "%s: flags %x\n", __func__, siu_stream->rw_flg);
221
222 if (!siu_stream->rw_flg) {
223 dev_dbg(dev, "%s: stream inactive\n", __func__);
224 return;
225 }
226
227 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
228 dma_addr_t buff;
229 size_t count;
230 u8 *virt;
231
232 buff = (dma_addr_t)PERIOD_OFFSET(rt->dma_addr,
233 siu_stream->cur_period,
234 siu_stream->period_bytes);
235 virt = PERIOD_OFFSET(rt->dma_area,
236 siu_stream->cur_period,
237 siu_stream->period_bytes);
238 count = siu_stream->period_bytes;
239
240 /* DMA transfer start */
241 siu_pcm_rd_set(port_info, buff, count);
242 } else {
243 siu_pcm_wr_set(port_info,
244 (dma_addr_t)PERIOD_OFFSET(rt->dma_addr,
245 siu_stream->cur_period,
246 siu_stream->period_bytes),
247 siu_stream->period_bytes);
248 }
249}
250
251/* Capture */
252static int siu_pcm_stmread_start(struct siu_port *port_info)
253{
254 struct siu_stream *siu_stream = &port_info->capture;
255
256 if (siu_stream->xfer_cnt > 0x1000000)
257 return -EINVAL;
258 if (siu_stream->rw_flg)
259 return -EPERM;
260
261 /* Current period in buffer */
262 siu_stream->cur_period = 0;
263
264 /* during stmread flag set */
265 siu_stream->rw_flg = RWF_STM_RD;
266
267 tasklet_schedule(&siu_stream->tasklet);
268
269 return 0;
270}
271
272static int siu_pcm_stmread_stop(struct siu_port *port_info)
273{
274 struct siu_info *info = siu_i2s_dai.private_data;
275 u32 __iomem *base = info->reg;
276 struct siu_stream *siu_stream = &port_info->capture;
277 struct device *dev = siu_stream->substream->pcm->card->dev;
278 u32 stfifo;
279
280 if (!siu_stream->rw_flg)
281 return -EPERM;
282
283 /* input FIFO disable */
284 stfifo = siu_read32(base + SIU_STFIFO);
285 siu_write32(base + SIU_STFIFO, stfifo & ~0x13071307);
286 dev_dbg(dev, "%s: STFIFO %x -> %x\n", __func__,
287 stfifo, stfifo & ~0x13071307);
288
289 /* during stmread flag clear */
290 siu_stream->rw_flg = 0;
291
292 return 0;
293}
294
295static int siu_pcm_hw_params(struct snd_pcm_substream *ss,
296 struct snd_pcm_hw_params *hw_params)
297{
298 struct siu_info *info = siu_i2s_dai.private_data;
299 struct device *dev = ss->pcm->card->dev;
300 int ret;
301
302 dev_dbg(dev, "%s: port=%d\n", __func__, info->port_id);
303
304 ret = snd_pcm_lib_malloc_pages(ss, params_buffer_bytes(hw_params));
305 if (ret < 0)
306 dev_err(dev, "snd_pcm_lib_malloc_pages() failed\n");
307
308 return ret;
309}
310
311static int siu_pcm_hw_free(struct snd_pcm_substream *ss)
312{
313 struct siu_info *info = siu_i2s_dai.private_data;
314 struct siu_port *port_info = siu_port_info(ss);
315 struct device *dev = ss->pcm->card->dev;
316 struct siu_stream *siu_stream;
317
318 if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
319 siu_stream = &port_info->playback;
320 else
321 siu_stream = &port_info->capture;
322
323 dev_dbg(dev, "%s: port=%d\n", __func__, info->port_id);
324
325 return snd_pcm_lib_free_pages(ss);
326}
327
328static bool filter(struct dma_chan *chan, void *slave)
329{
330 struct sh_dmae_slave *param = slave;
331
332 pr_debug("%s: slave ID %d\n", __func__, param->slave_id);
333
334 if (unlikely(param->dma_dev != chan->device->dev))
335 return false;
336
337 chan->private = param;
338 return true;
339}
340
341static int siu_pcm_open(struct snd_pcm_substream *ss)
342{
343 /* Playback / Capture */
344 struct siu_info *info = siu_i2s_dai.private_data;
345 struct siu_port *port_info = siu_port_info(ss);
346 struct siu_stream *siu_stream;
347 u32 port = info->port_id;
348 struct siu_platform *pdata = siu_i2s_dai.dev->platform_data;
349 struct device *dev = ss->pcm->card->dev;
350 dma_cap_mask_t mask;
351 struct sh_dmae_slave *param;
352
353 dma_cap_zero(mask);
354 dma_cap_set(DMA_SLAVE, mask);
355
356 dev_dbg(dev, "%s, port=%d@%p\n", __func__, port, port_info);
357
358 if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK) {
359 siu_stream = &port_info->playback;
360 param = &siu_stream->param;
361 param->slave_id = port ? SHDMA_SLAVE_SIUB_TX :
362 SHDMA_SLAVE_SIUA_TX;
363 } else {
364 siu_stream = &port_info->capture;
365 param = &siu_stream->param;
366 param->slave_id = port ? SHDMA_SLAVE_SIUB_RX :
367 SHDMA_SLAVE_SIUA_RX;
368 }
369
370 param->dma_dev = pdata->dma_dev;
371 /* Get DMA channel */
372 siu_stream->chan = dma_request_channel(mask, filter, param);
373 if (!siu_stream->chan) {
374 dev_err(dev, "DMA channel allocation failed!\n");
375 return -EBUSY;
376 }
377
378 siu_stream->substream = ss;
379
380 return 0;
381}
382
383static int siu_pcm_close(struct snd_pcm_substream *ss)
384{
385 struct siu_info *info = siu_i2s_dai.private_data;
386 struct device *dev = ss->pcm->card->dev;
387 struct siu_port *port_info = siu_port_info(ss);
388 struct siu_stream *siu_stream;
389
390 dev_dbg(dev, "%s: port=%d\n", __func__, info->port_id);
391
392 if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
393 siu_stream = &port_info->playback;
394 else
395 siu_stream = &port_info->capture;
396
397 dma_release_channel(siu_stream->chan);
398 siu_stream->chan = NULL;
399
400 siu_stream->substream = NULL;
401
402 return 0;
403}
404
405static int siu_pcm_prepare(struct snd_pcm_substream *ss)
406{
407 struct siu_info *info = siu_i2s_dai.private_data;
408 struct siu_port *port_info = siu_port_info(ss);
409 struct device *dev = ss->pcm->card->dev;
410 struct snd_pcm_runtime *rt = ss->runtime;
411 struct siu_stream *siu_stream;
412 snd_pcm_sframes_t xfer_cnt;
413
414 if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
415 siu_stream = &port_info->playback;
416 else
417 siu_stream = &port_info->capture;
418
419 rt = siu_stream->substream->runtime;
420
421 siu_stream->buf_bytes = snd_pcm_lib_buffer_bytes(ss);
422 siu_stream->period_bytes = snd_pcm_lib_period_bytes(ss);
423
424 dev_dbg(dev, "%s: port=%d, %d channels, period=%u bytes\n", __func__,
425 info->port_id, rt->channels, siu_stream->period_bytes);
426
427 /* We only support buffers that are multiples of the period */
428 if (siu_stream->buf_bytes % siu_stream->period_bytes) {
429 dev_err(dev, "%s() - buffer=%d not multiple of period=%d\n",
430 __func__, siu_stream->buf_bytes,
431 siu_stream->period_bytes);
432 return -EINVAL;
433 }
434
435 xfer_cnt = bytes_to_frames(rt, siu_stream->period_bytes);
436 if (!xfer_cnt || xfer_cnt > 0x1000000)
437 return -EINVAL;
438
439 siu_stream->format = rt->format;
440 siu_stream->xfer_cnt = xfer_cnt;
441
442 dev_dbg(dev, "port=%d buf=%lx buf_bytes=%d period_bytes=%d "
443 "format=%d channels=%d xfer_cnt=%d\n", info->port_id,
444 (unsigned long)rt->dma_addr, siu_stream->buf_bytes,
445 siu_stream->period_bytes,
446 siu_stream->format, rt->channels, (int)xfer_cnt);
447
448 return 0;
449}
450
451static int siu_pcm_trigger(struct snd_pcm_substream *ss, int cmd)
452{
453 struct siu_info *info = siu_i2s_dai.private_data;
454 struct device *dev = ss->pcm->card->dev;
455 struct siu_port *port_info = siu_port_info(ss);
456 int ret;
457
458 dev_dbg(dev, "%s: port=%d@%p, cmd=%d\n", __func__,
459 info->port_id, port_info, cmd);
460
461 switch (cmd) {
462 case SNDRV_PCM_TRIGGER_START:
463 if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
464 ret = siu_pcm_stmwrite_start(port_info);
465 else
466 ret = siu_pcm_stmread_start(port_info);
467
468 if (ret < 0)
469 dev_warn(dev, "%s: start failed on port=%d\n",
470 __func__, info->port_id);
471
472 break;
473 case SNDRV_PCM_TRIGGER_STOP:
474 if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
475 siu_pcm_stmwrite_stop(port_info);
476 else
477 siu_pcm_stmread_stop(port_info);
478 ret = 0;
479
480 break;
481 default:
482 dev_err(dev, "%s() unsupported cmd=%d\n", __func__, cmd);
483 ret = -EINVAL;
484 }
485
486 return ret;
487}
488
489/*
490 * So far only resolution of one period is supported, subject to extending the
491 * dmangine API
492 */
493static snd_pcm_uframes_t siu_pcm_pointer_dma(struct snd_pcm_substream *ss)
494{
495 struct device *dev = ss->pcm->card->dev;
496 struct siu_info *info = siu_i2s_dai.private_data;
497 u32 __iomem *base = info->reg;
498 struct siu_port *port_info = siu_port_info(ss);
499 struct snd_pcm_runtime *rt = ss->runtime;
500 size_t ptr;
501 struct siu_stream *siu_stream;
502
503 if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
504 siu_stream = &port_info->playback;
505 else
506 siu_stream = &port_info->capture;
507
508 /*
509 * ptr is the offset into the buffer where the dma is currently at. We
510 * check if the dma buffer has just wrapped.
511 */
512 ptr = PERIOD_OFFSET(rt->dma_addr,
513 siu_stream->cur_period,
514 siu_stream->period_bytes) - rt->dma_addr;
515
516 dev_dbg(dev,
517 "%s: port=%d, events %x, FSTS %x, xferred %u/%u, cookie %d\n",
518 __func__, info->port_id, siu_read32(base + SIU_EVNTC),
519 siu_read32(base + SIU_SBFSTS), ptr, siu_stream->buf_bytes,
520 siu_stream->cookie);
521
522 if (ptr >= siu_stream->buf_bytes)
523 ptr = 0;
524
525 return bytes_to_frames(ss->runtime, ptr);
526}
527
528static int siu_pcm_new(struct snd_card *card, struct snd_soc_dai *dai,
529 struct snd_pcm *pcm)
530{
531 /* card->dev == socdev->dev, see snd_soc_new_pcms() */
532 struct siu_info *info = siu_i2s_dai.private_data;
533 struct platform_device *pdev = to_platform_device(card->dev);
534 int ret;
535 int i;
536
537 /* pdev->id selects between SIUA and SIUB */
538 if (pdev->id < 0 || pdev->id >= SIU_PORT_NUM)
539 return -EINVAL;
540
541 info->port_id = pdev->id;
542
543 /*
544 * While the siu has 2 ports, only one port can be on at a time (only 1
545 * SPB). So far all the boards using the siu had only one of the ports
546 * wired to a codec. To simplify things, we only register one port with
547 * alsa. In case both ports are needed, it should be changed here
548 */
549 for (i = pdev->id; i < pdev->id + 1; i++) {
550 struct siu_port **port_info = &siu_ports[i];
551
552 ret = siu_init_port(i, port_info, card);
553 if (ret < 0)
554 return ret;
555
556 ret = snd_pcm_lib_preallocate_pages_for_all(pcm,
557 SNDRV_DMA_TYPE_DEV, NULL,
558 SIU_BUFFER_BYTES_MAX, SIU_BUFFER_BYTES_MAX);
559 if (ret < 0) {
560 dev_err(card->dev,
561 "snd_pcm_lib_preallocate_pages_for_all() err=%d",
562 ret);
563 goto fail;
564 }
565
566 (*port_info)->pcm = pcm;
567
568 /* IO tasklets */
569 tasklet_init(&(*port_info)->playback.tasklet, siu_io_tasklet,
570 (unsigned long)&(*port_info)->playback);
571 tasklet_init(&(*port_info)->capture.tasklet, siu_io_tasklet,
572 (unsigned long)&(*port_info)->capture);
573 }
574
575 dev_info(card->dev, "SuperH SIU driver initialized.\n");
576 return 0;
577
578fail:
579 siu_free_port(siu_ports[pdev->id]);
580 dev_err(card->dev, "SIU: failed to initialize.\n");
581 return ret;
582}
583
584static void siu_pcm_free(struct snd_pcm *pcm)
585{
586 struct platform_device *pdev = to_platform_device(pcm->card->dev);
587 struct siu_port *port_info = siu_ports[pdev->id];
588
589 tasklet_kill(&port_info->capture.tasklet);
590 tasklet_kill(&port_info->playback.tasklet);
591
592 siu_free_port(port_info);
593 snd_pcm_lib_preallocate_free_for_all(pcm);
594
595 dev_dbg(pcm->card->dev, "%s\n", __func__);
596}
597
598static struct snd_pcm_ops siu_pcm_ops = {
599 .open = siu_pcm_open,
600 .close = siu_pcm_close,
601 .ioctl = snd_pcm_lib_ioctl,
602 .hw_params = siu_pcm_hw_params,
603 .hw_free = siu_pcm_hw_free,
604 .prepare = siu_pcm_prepare,
605 .trigger = siu_pcm_trigger,
606 .pointer = siu_pcm_pointer_dma,
607};
608
609struct snd_soc_platform siu_platform = {
610 .name = "siu-audio",
611 .pcm_ops = &siu_pcm_ops,
612 .pcm_new = siu_pcm_new,
613 .pcm_free = siu_pcm_free,
614};
615EXPORT_SYMBOL_GPL(siu_platform);