1 /*
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>
27
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.h>
33
34 #include <asm/siu.h>
35
36 #include "siu.h"
37
38 #define GET_MAX_PERIODS(buf_bytes, period_bytes) \
39 ((buf_bytes) / (period_bytes))
40 #define PERIOD_OFFSET(buf_addr, period_num, period_bytes) \
41 ((buf_addr) + ((period_num) * (period_bytes)))
42
43 #define RWF_STM_RD 0x01 /* Read in progress */
44 #define RWF_STM_WT 0x02 /* Write in progress */
45
46 struct siu_port *siu_ports[SIU_PORT_NUM];
47
48 /* transfersize is number of u32 dma transfers per period */
siu_pcm_stmwrite_stop(struct siu_port * port_info)49 static int siu_pcm_stmwrite_stop(struct siu_port *port_info)
50 {
51 struct siu_info *info = siu_i2s_data;
52 u32 __iomem *base = info->reg;
53 struct siu_stream *siu_stream = &port_info->playback;
54 u32 stfifo;
55
56 if (!siu_stream->rw_flg)
57 return -EPERM;
58
59 /* output FIFO disable */
60 stfifo = siu_read32(base + SIU_STFIFO);
61 siu_write32(base + SIU_STFIFO, stfifo & ~0x0c180c18);
62 pr_debug("%s: STFIFO %x -> %x\n", __func__,
63 stfifo, stfifo & ~0x0c180c18);
64
65 /* during stmwrite clear */
66 siu_stream->rw_flg = 0;
67
68 return 0;
69 }
70
siu_pcm_stmwrite_start(struct siu_port * port_info)71 static int siu_pcm_stmwrite_start(struct siu_port *port_info)
72 {
73 struct siu_stream *siu_stream = &port_info->playback;
74
75 if (siu_stream->rw_flg)
76 return -EPERM;
77
78 /* Current period in buffer */
79 port_info->playback.cur_period = 0;
80
81 /* during stmwrite flag set */
82 siu_stream->rw_flg = RWF_STM_WT;
83
84 /* DMA transfer start */
85 tasklet_schedule(&siu_stream->tasklet);
86
87 return 0;
88 }
89
siu_dma_tx_complete(void * arg)90 static void siu_dma_tx_complete(void *arg)
91 {
92 struct siu_stream *siu_stream = arg;
93
94 if (!siu_stream->rw_flg)
95 return;
96
97 /* Update completed period count */
98 if (++siu_stream->cur_period >=
99 GET_MAX_PERIODS(siu_stream->buf_bytes,
100 siu_stream->period_bytes))
101 siu_stream->cur_period = 0;
102
103 pr_debug("%s: done period #%d (%u/%u bytes), cookie %d\n",
104 __func__, siu_stream->cur_period,
105 siu_stream->cur_period * siu_stream->period_bytes,
106 siu_stream->buf_bytes, siu_stream->cookie);
107
108 tasklet_schedule(&siu_stream->tasklet);
109
110 /* Notify alsa: a period is done */
111 snd_pcm_period_elapsed(siu_stream->substream);
112 }
113
siu_pcm_wr_set(struct siu_port * port_info,dma_addr_t buff,u32 size)114 static int siu_pcm_wr_set(struct siu_port *port_info,
115 dma_addr_t buff, u32 size)
116 {
117 struct siu_info *info = siu_i2s_data;
118 u32 __iomem *base = info->reg;
119 struct siu_stream *siu_stream = &port_info->playback;
120 struct snd_pcm_substream *substream = siu_stream->substream;
121 struct device *dev = substream->pcm->card->dev;
122 struct dma_async_tx_descriptor *desc;
123 dma_cookie_t cookie;
124 struct scatterlist sg;
125 u32 stfifo;
126
127 sg_init_table(&sg, 1);
128 sg_set_page(&sg, pfn_to_page(PFN_DOWN(buff)),
129 size, offset_in_page(buff));
130 sg_dma_len(&sg) = size;
131 sg_dma_address(&sg) = buff;
132
133 desc = dmaengine_prep_slave_sg(siu_stream->chan,
134 &sg, 1, DMA_MEM_TO_DEV, 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
siu_pcm_rd_set(struct siu_port * port_info,dma_addr_t buff,size_t size)162 static 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_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_len(&sg) = size;
181 sg_dma_address(&sg) = buff;
182
183 desc = dmaengine_prep_slave_sg(siu_stream->chan,
184 &sg, 1, DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
185 if (!desc) {
186 dev_err(dev, "Failed to allocate dma descriptor\n");
187 return -ENOMEM;
188 }
189
190 desc->callback = siu_dma_tx_complete;
191 desc->callback_param = siu_stream;
192 cookie = desc->tx_submit(desc);
193 if (cookie < 0) {
194 dev_err(dev, "Failed to submit dma descriptor\n");
195 return cookie;
196 }
197
198 siu_stream->tx_desc = desc;
199 siu_stream->cookie = cookie;
200
201 dma_async_issue_pending(siu_stream->chan);
202
203 /* only input FIFO enable */
204 stfifo = siu_read32(base + SIU_STFIFO);
205 siu_write32(base + SIU_STFIFO, siu_read32(base + SIU_STFIFO) |
206 (port_info->stfifo & 0x13071307));
207 dev_dbg(dev, "%s: STFIFO %x -> %x\n", __func__,
208 stfifo, stfifo | (port_info->stfifo & 0x13071307));
209
210 return 0;
211 }
212
siu_io_tasklet(unsigned long data)213 static void siu_io_tasklet(unsigned long data)
214 {
215 struct siu_stream *siu_stream = (struct siu_stream *)data;
216 struct snd_pcm_substream *substream = siu_stream->substream;
217 struct device *dev = substream->pcm->card->dev;
218 struct snd_pcm_runtime *rt = substream->runtime;
219 struct siu_port *port_info = siu_port_info(substream);
220
221 dev_dbg(dev, "%s: flags %x\n", __func__, siu_stream->rw_flg);
222
223 if (!siu_stream->rw_flg) {
224 dev_dbg(dev, "%s: stream inactive\n", __func__);
225 return;
226 }
227
228 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
229 dma_addr_t buff;
230 size_t count;
231 u8 *virt;
232
233 buff = (dma_addr_t)PERIOD_OFFSET(rt->dma_addr,
234 siu_stream->cur_period,
235 siu_stream->period_bytes);
236 virt = PERIOD_OFFSET(rt->dma_area,
237 siu_stream->cur_period,
238 siu_stream->period_bytes);
239 count = siu_stream->period_bytes;
240
241 /* DMA transfer start */
242 siu_pcm_rd_set(port_info, buff, count);
243 } else {
244 siu_pcm_wr_set(port_info,
245 (dma_addr_t)PERIOD_OFFSET(rt->dma_addr,
246 siu_stream->cur_period,
247 siu_stream->period_bytes),
248 siu_stream->period_bytes);
249 }
250 }
251
252 /* Capture */
siu_pcm_stmread_start(struct siu_port * port_info)253 static int siu_pcm_stmread_start(struct siu_port *port_info)
254 {
255 struct siu_stream *siu_stream = &port_info->capture;
256
257 if (siu_stream->xfer_cnt > 0x1000000)
258 return -EINVAL;
259 if (siu_stream->rw_flg)
260 return -EPERM;
261
262 /* Current period in buffer */
263 siu_stream->cur_period = 0;
264
265 /* during stmread flag set */
266 siu_stream->rw_flg = RWF_STM_RD;
267
268 tasklet_schedule(&siu_stream->tasklet);
269
270 return 0;
271 }
272
siu_pcm_stmread_stop(struct siu_port * port_info)273 static int siu_pcm_stmread_stop(struct siu_port *port_info)
274 {
275 struct siu_info *info = siu_i2s_data;
276 u32 __iomem *base = info->reg;
277 struct siu_stream *siu_stream = &port_info->capture;
278 struct device *dev = siu_stream->substream->pcm->card->dev;
279 u32 stfifo;
280
281 if (!siu_stream->rw_flg)
282 return -EPERM;
283
284 /* input FIFO disable */
285 stfifo = siu_read32(base + SIU_STFIFO);
286 siu_write32(base + SIU_STFIFO, stfifo & ~0x13071307);
287 dev_dbg(dev, "%s: STFIFO %x -> %x\n", __func__,
288 stfifo, stfifo & ~0x13071307);
289
290 /* during stmread flag clear */
291 siu_stream->rw_flg = 0;
292
293 return 0;
294 }
295
siu_pcm_hw_params(struct snd_pcm_substream * ss,struct snd_pcm_hw_params * hw_params)296 static int siu_pcm_hw_params(struct snd_pcm_substream *ss,
297 struct snd_pcm_hw_params *hw_params)
298 {
299 struct siu_info *info = siu_i2s_data;
300 struct device *dev = ss->pcm->card->dev;
301 int ret;
302
303 dev_dbg(dev, "%s: port=%d\n", __func__, info->port_id);
304
305 ret = snd_pcm_lib_malloc_pages(ss, params_buffer_bytes(hw_params));
306 if (ret < 0)
307 dev_err(dev, "snd_pcm_lib_malloc_pages() failed\n");
308
309 return ret;
310 }
311
siu_pcm_hw_free(struct snd_pcm_substream * ss)312 static int siu_pcm_hw_free(struct snd_pcm_substream *ss)
313 {
314 struct siu_info *info = siu_i2s_data;
315 struct siu_port *port_info = siu_port_info(ss);
316 struct device *dev = ss->pcm->card->dev;
317 struct siu_stream *siu_stream;
318
319 if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
320 siu_stream = &port_info->playback;
321 else
322 siu_stream = &port_info->capture;
323
324 dev_dbg(dev, "%s: port=%d\n", __func__, info->port_id);
325
326 return snd_pcm_lib_free_pages(ss);
327 }
328
filter(struct dma_chan * chan,void * slave)329 static bool filter(struct dma_chan *chan, void *slave)
330 {
331 struct sh_dmae_slave *param = slave;
332
333 pr_debug("%s: slave ID %d\n", __func__, param->slave_id);
334
335 if (unlikely(param->dma_dev != chan->device->dev))
336 return false;
337
338 chan->private = param;
339 return true;
340 }
341
siu_pcm_open(struct snd_pcm_substream * ss)342 static int siu_pcm_open(struct snd_pcm_substream *ss)
343 {
344 /* Playback / Capture */
345 struct snd_soc_pcm_runtime *rtd = ss->private_data;
346 struct siu_platform *pdata = rtd->platform->dev->platform_data;
347 struct siu_info *info = siu_i2s_data;
348 struct siu_port *port_info = siu_port_info(ss);
349 struct siu_stream *siu_stream;
350 u32 port = info->port_id;
351 struct device *dev = ss->pcm->card->dev;
352 dma_cap_mask_t mask;
353 struct sh_dmae_slave *param;
354
355 dma_cap_zero(mask);
356 dma_cap_set(DMA_SLAVE, mask);
357
358 dev_dbg(dev, "%s, port=%d@%p\n", __func__, port, port_info);
359
360 if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK) {
361 siu_stream = &port_info->playback;
362 param = &siu_stream->param;
363 param->slave_id = port ? pdata->dma_slave_tx_b :
364 pdata->dma_slave_tx_a;
365 } else {
366 siu_stream = &port_info->capture;
367 param = &siu_stream->param;
368 param->slave_id = port ? pdata->dma_slave_rx_b :
369 pdata->dma_slave_rx_a;
370 }
371
372 param->dma_dev = pdata->dma_dev;
373 /* Get DMA channel */
374 siu_stream->chan = dma_request_channel(mask, filter, param);
375 if (!siu_stream->chan) {
376 dev_err(dev, "DMA channel allocation failed!\n");
377 return -EBUSY;
378 }
379
380 siu_stream->substream = ss;
381
382 return 0;
383 }
384
siu_pcm_close(struct snd_pcm_substream * ss)385 static int siu_pcm_close(struct snd_pcm_substream *ss)
386 {
387 struct siu_info *info = siu_i2s_data;
388 struct device *dev = ss->pcm->card->dev;
389 struct siu_port *port_info = siu_port_info(ss);
390 struct siu_stream *siu_stream;
391
392 dev_dbg(dev, "%s: port=%d\n", __func__, info->port_id);
393
394 if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
395 siu_stream = &port_info->playback;
396 else
397 siu_stream = &port_info->capture;
398
399 dma_release_channel(siu_stream->chan);
400 siu_stream->chan = NULL;
401
402 siu_stream->substream = NULL;
403
404 return 0;
405 }
406
siu_pcm_prepare(struct snd_pcm_substream * ss)407 static int siu_pcm_prepare(struct snd_pcm_substream *ss)
408 {
409 struct siu_info *info = siu_i2s_data;
410 struct siu_port *port_info = siu_port_info(ss);
411 struct device *dev = ss->pcm->card->dev;
412 struct snd_pcm_runtime *rt = ss->runtime;
413 struct siu_stream *siu_stream;
414 snd_pcm_sframes_t xfer_cnt;
415
416 if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
417 siu_stream = &port_info->playback;
418 else
419 siu_stream = &port_info->capture;
420
421 rt = siu_stream->substream->runtime;
422
423 siu_stream->buf_bytes = snd_pcm_lib_buffer_bytes(ss);
424 siu_stream->period_bytes = snd_pcm_lib_period_bytes(ss);
425
426 dev_dbg(dev, "%s: port=%d, %d channels, period=%u bytes\n", __func__,
427 info->port_id, rt->channels, siu_stream->period_bytes);
428
429 /* We only support buffers that are multiples of the period */
430 if (siu_stream->buf_bytes % siu_stream->period_bytes) {
431 dev_err(dev, "%s() - buffer=%d not multiple of period=%d\n",
432 __func__, siu_stream->buf_bytes,
433 siu_stream->period_bytes);
434 return -EINVAL;
435 }
436
437 xfer_cnt = bytes_to_frames(rt, siu_stream->period_bytes);
438 if (!xfer_cnt || xfer_cnt > 0x1000000)
439 return -EINVAL;
440
441 siu_stream->format = rt->format;
442 siu_stream->xfer_cnt = xfer_cnt;
443
444 dev_dbg(dev, "port=%d buf=%lx buf_bytes=%d period_bytes=%d "
445 "format=%d channels=%d xfer_cnt=%d\n", info->port_id,
446 (unsigned long)rt->dma_addr, siu_stream->buf_bytes,
447 siu_stream->period_bytes,
448 siu_stream->format, rt->channels, (int)xfer_cnt);
449
450 return 0;
451 }
452
siu_pcm_trigger(struct snd_pcm_substream * ss,int cmd)453 static int siu_pcm_trigger(struct snd_pcm_substream *ss, int cmd)
454 {
455 struct siu_info *info = siu_i2s_data;
456 struct device *dev = ss->pcm->card->dev;
457 struct siu_port *port_info = siu_port_info(ss);
458 int ret;
459
460 dev_dbg(dev, "%s: port=%d@%p, cmd=%d\n", __func__,
461 info->port_id, port_info, cmd);
462
463 switch (cmd) {
464 case SNDRV_PCM_TRIGGER_START:
465 if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
466 ret = siu_pcm_stmwrite_start(port_info);
467 else
468 ret = siu_pcm_stmread_start(port_info);
469
470 if (ret < 0)
471 dev_warn(dev, "%s: start failed on port=%d\n",
472 __func__, info->port_id);
473
474 break;
475 case SNDRV_PCM_TRIGGER_STOP:
476 if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
477 siu_pcm_stmwrite_stop(port_info);
478 else
479 siu_pcm_stmread_stop(port_info);
480 ret = 0;
481
482 break;
483 default:
484 dev_err(dev, "%s() unsupported cmd=%d\n", __func__, cmd);
485 ret = -EINVAL;
486 }
487
488 return ret;
489 }
490
491 /*
492 * So far only resolution of one period is supported, subject to extending the
493 * dmangine API
494 */
siu_pcm_pointer_dma(struct snd_pcm_substream * ss)495 static snd_pcm_uframes_t siu_pcm_pointer_dma(struct snd_pcm_substream *ss)
496 {
497 struct device *dev = ss->pcm->card->dev;
498 struct siu_info *info = siu_i2s_data;
499 u32 __iomem *base = info->reg;
500 struct siu_port *port_info = siu_port_info(ss);
501 struct snd_pcm_runtime *rt = ss->runtime;
502 size_t ptr;
503 struct siu_stream *siu_stream;
504
505 if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
506 siu_stream = &port_info->playback;
507 else
508 siu_stream = &port_info->capture;
509
510 /*
511 * ptr is the offset into the buffer where the dma is currently at. We
512 * check if the dma buffer has just wrapped.
513 */
514 ptr = PERIOD_OFFSET(rt->dma_addr,
515 siu_stream->cur_period,
516 siu_stream->period_bytes) - rt->dma_addr;
517
518 dev_dbg(dev,
519 "%s: port=%d, events %x, FSTS %x, xferred %u/%u, cookie %d\n",
520 __func__, info->port_id, siu_read32(base + SIU_EVNTC),
521 siu_read32(base + SIU_SBFSTS), ptr, siu_stream->buf_bytes,
522 siu_stream->cookie);
523
524 if (ptr >= siu_stream->buf_bytes)
525 ptr = 0;
526
527 return bytes_to_frames(ss->runtime, ptr);
528 }
529
siu_pcm_new(struct snd_soc_pcm_runtime * rtd)530 static int siu_pcm_new(struct snd_soc_pcm_runtime *rtd)
531 {
532 /* card->dev == socdev->dev, see snd_soc_new_pcms() */
533 struct snd_card *card = rtd->card->snd_card;
534 struct snd_pcm *pcm = rtd->pcm;
535 struct siu_info *info = siu_i2s_data;
536 struct platform_device *pdev = to_platform_device(card->dev);
537 int ret;
538 int i;
539
540 /* pdev->id selects between SIUA and SIUB */
541 if (pdev->id < 0 || pdev->id >= SIU_PORT_NUM)
542 return -EINVAL;
543
544 info->port_id = pdev->id;
545
546 /*
547 * While the siu has 2 ports, only one port can be on at a time (only 1
548 * SPB). So far all the boards using the siu had only one of the ports
549 * wired to a codec. To simplify things, we only register one port with
550 * alsa. In case both ports are needed, it should be changed here
551 */
552 for (i = pdev->id; i < pdev->id + 1; i++) {
553 struct siu_port **port_info = &siu_ports[i];
554
555 ret = siu_init_port(i, port_info, card);
556 if (ret < 0)
557 return ret;
558
559 ret = snd_pcm_lib_preallocate_pages_for_all(pcm,
560 SNDRV_DMA_TYPE_DEV, NULL,
561 SIU_BUFFER_BYTES_MAX, SIU_BUFFER_BYTES_MAX);
562 if (ret < 0) {
563 dev_err(card->dev,
564 "snd_pcm_lib_preallocate_pages_for_all() err=%d",
565 ret);
566 goto fail;
567 }
568
569 (*port_info)->pcm = pcm;
570
571 /* IO tasklets */
572 tasklet_init(&(*port_info)->playback.tasklet, siu_io_tasklet,
573 (unsigned long)&(*port_info)->playback);
574 tasklet_init(&(*port_info)->capture.tasklet, siu_io_tasklet,
575 (unsigned long)&(*port_info)->capture);
576 }
577
578 dev_info(card->dev, "SuperH SIU driver initialized.\n");
579 return 0;
580
581 fail:
582 siu_free_port(siu_ports[pdev->id]);
583 dev_err(card->dev, "SIU: failed to initialize.\n");
584 return ret;
585 }
586
siu_pcm_free(struct snd_pcm * pcm)587 static void siu_pcm_free(struct snd_pcm *pcm)
588 {
589 struct platform_device *pdev = to_platform_device(pcm->card->dev);
590 struct siu_port *port_info = siu_ports[pdev->id];
591
592 tasklet_kill(&port_info->capture.tasklet);
593 tasklet_kill(&port_info->playback.tasklet);
594
595 siu_free_port(port_info);
596 snd_pcm_lib_preallocate_free_for_all(pcm);
597
598 dev_dbg(pcm->card->dev, "%s\n", __func__);
599 }
600
601 static struct snd_pcm_ops siu_pcm_ops = {
602 .open = siu_pcm_open,
603 .close = siu_pcm_close,
604 .ioctl = snd_pcm_lib_ioctl,
605 .hw_params = siu_pcm_hw_params,
606 .hw_free = siu_pcm_hw_free,
607 .prepare = siu_pcm_prepare,
608 .trigger = siu_pcm_trigger,
609 .pointer = siu_pcm_pointer_dma,
610 };
611
612 struct snd_soc_platform_driver siu_platform = {
613 .ops = &siu_pcm_ops,
614 .pcm_new = siu_pcm_new,
615 .pcm_free = siu_pcm_free,
616 };
617 EXPORT_SYMBOL_GPL(siu_platform);
618