2
* siu_pcm.c - ALSA driver for Renesas SH7343, SH7722 SIU peripheral.
4
* Copyright (C) 2009-2010 Guennadi Liakhovetski <g.liakhovetski@gmx.de>
5
* Copyright (C) 2006 Carlos Munoz <carlos@kenati.com>
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.
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.
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.
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>
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>
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)))
43
#define RWF_STM_RD 0x01 /* Read in progress */
44
#define RWF_STM_WT 0x02 /* Write in progress */
46
struct siu_port *siu_ports[SIU_PORT_NUM];
48
/* transfersize is number of u32 dma transfers per period */
49
static int siu_pcm_stmwrite_stop(struct siu_port *port_info)
51
struct siu_info *info = siu_i2s_data;
52
u32 __iomem *base = info->reg;
53
struct siu_stream *siu_stream = &port_info->playback;
56
if (!siu_stream->rw_flg)
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);
65
/* during stmwrite clear */
66
siu_stream->rw_flg = 0;
71
static int siu_pcm_stmwrite_start(struct siu_port *port_info)
73
struct siu_stream *siu_stream = &port_info->playback;
75
if (siu_stream->rw_flg)
78
/* Current period in buffer */
79
port_info->playback.cur_period = 0;
81
/* during stmwrite flag set */
82
siu_stream->rw_flg = RWF_STM_WT;
84
/* DMA transfer start */
85
tasklet_schedule(&siu_stream->tasklet);
90
static void siu_dma_tx_complete(void *arg)
92
struct siu_stream *siu_stream = arg;
94
if (!siu_stream->rw_flg)
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;
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);
108
tasklet_schedule(&siu_stream->tasklet);
110
/* Notify alsa: a period is done */
111
snd_pcm_period_elapsed(siu_stream->substream);
114
static int siu_pcm_wr_set(struct siu_port *port_info,
115
dma_addr_t buff, u32 size)
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;
124
struct scatterlist sg;
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;
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);
136
dev_err(dev, "Failed to allocate a dma descriptor\n");
140
desc->callback = siu_dma_tx_complete;
141
desc->callback_param = siu_stream;
142
cookie = desc->tx_submit(desc);
144
dev_err(dev, "Failed to submit a dma transfer\n");
148
siu_stream->tx_desc = desc;
149
siu_stream->cookie = cookie;
151
dma_async_issue_pending(siu_stream->chan);
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));
162
static int siu_pcm_rd_set(struct siu_port *port_info,
163
dma_addr_t buff, size_t size)
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;
172
struct scatterlist sg;
175
dev_dbg(dev, "%s: %u@%llx\n", __func__, size, (unsigned long long)buff);
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;
183
desc = siu_stream->chan->device->device_prep_slave_sg(siu_stream->chan,
184
&sg, 1, DMA_FROM_DEVICE, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
186
dev_err(dev, "Failed to allocate dma descriptor\n");
190
desc->callback = siu_dma_tx_complete;
191
desc->callback_param = siu_stream;
192
cookie = desc->tx_submit(desc);
194
dev_err(dev, "Failed to submit dma descriptor\n");
198
siu_stream->tx_desc = desc;
199
siu_stream->cookie = cookie;
201
dma_async_issue_pending(siu_stream->chan);
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));
213
static void siu_io_tasklet(unsigned long data)
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);
221
dev_dbg(dev, "%s: flags %x\n", __func__, siu_stream->rw_flg);
223
if (!siu_stream->rw_flg) {
224
dev_dbg(dev, "%s: stream inactive\n", __func__);
228
if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
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;
241
/* DMA transfer start */
242
siu_pcm_rd_set(port_info, buff, count);
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);
253
static int siu_pcm_stmread_start(struct siu_port *port_info)
255
struct siu_stream *siu_stream = &port_info->capture;
257
if (siu_stream->xfer_cnt > 0x1000000)
259
if (siu_stream->rw_flg)
262
/* Current period in buffer */
263
siu_stream->cur_period = 0;
265
/* during stmread flag set */
266
siu_stream->rw_flg = RWF_STM_RD;
268
tasklet_schedule(&siu_stream->tasklet);
273
static int siu_pcm_stmread_stop(struct siu_port *port_info)
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;
281
if (!siu_stream->rw_flg)
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);
290
/* during stmread flag clear */
291
siu_stream->rw_flg = 0;
296
static int siu_pcm_hw_params(struct snd_pcm_substream *ss,
297
struct snd_pcm_hw_params *hw_params)
299
struct siu_info *info = siu_i2s_data;
300
struct device *dev = ss->pcm->card->dev;
303
dev_dbg(dev, "%s: port=%d\n", __func__, info->port_id);
305
ret = snd_pcm_lib_malloc_pages(ss, params_buffer_bytes(hw_params));
307
dev_err(dev, "snd_pcm_lib_malloc_pages() failed\n");
312
static int siu_pcm_hw_free(struct snd_pcm_substream *ss)
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;
319
if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
320
siu_stream = &port_info->playback;
322
siu_stream = &port_info->capture;
324
dev_dbg(dev, "%s: port=%d\n", __func__, info->port_id);
326
return snd_pcm_lib_free_pages(ss);
329
static bool filter(struct dma_chan *chan, void *slave)
331
struct sh_dmae_slave *param = slave;
333
pr_debug("%s: slave ID %d\n", __func__, param->slave_id);
335
if (unlikely(param->dma_dev != chan->device->dev))
338
chan->private = param;
342
static int siu_pcm_open(struct snd_pcm_substream *ss)
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;
353
struct sh_dmae_slave *param;
356
dma_cap_set(DMA_SLAVE, mask);
358
dev_dbg(dev, "%s, port=%d@%p\n", __func__, port, port_info);
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;
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;
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");
380
siu_stream->substream = ss;
385
static int siu_pcm_close(struct snd_pcm_substream *ss)
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;
392
dev_dbg(dev, "%s: port=%d\n", __func__, info->port_id);
394
if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
395
siu_stream = &port_info->playback;
397
siu_stream = &port_info->capture;
399
dma_release_channel(siu_stream->chan);
400
siu_stream->chan = NULL;
402
siu_stream->substream = NULL;
407
static int siu_pcm_prepare(struct snd_pcm_substream *ss)
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;
416
if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
417
siu_stream = &port_info->playback;
419
siu_stream = &port_info->capture;
421
rt = siu_stream->substream->runtime;
423
siu_stream->buf_bytes = snd_pcm_lib_buffer_bytes(ss);
424
siu_stream->period_bytes = snd_pcm_lib_period_bytes(ss);
426
dev_dbg(dev, "%s: port=%d, %d channels, period=%u bytes\n", __func__,
427
info->port_id, rt->channels, siu_stream->period_bytes);
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);
437
xfer_cnt = bytes_to_frames(rt, siu_stream->period_bytes);
438
if (!xfer_cnt || xfer_cnt > 0x1000000)
441
siu_stream->format = rt->format;
442
siu_stream->xfer_cnt = xfer_cnt;
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);
453
static int siu_pcm_trigger(struct snd_pcm_substream *ss, int cmd)
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);
460
dev_dbg(dev, "%s: port=%d@%p, cmd=%d\n", __func__,
461
info->port_id, port_info, cmd);
464
case SNDRV_PCM_TRIGGER_START:
465
if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
466
ret = siu_pcm_stmwrite_start(port_info);
468
ret = siu_pcm_stmread_start(port_info);
471
dev_warn(dev, "%s: start failed on port=%d\n",
472
__func__, info->port_id);
475
case SNDRV_PCM_TRIGGER_STOP:
476
if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
477
siu_pcm_stmwrite_stop(port_info);
479
siu_pcm_stmread_stop(port_info);
484
dev_err(dev, "%s() unsupported cmd=%d\n", __func__, cmd);
492
* So far only resolution of one period is supported, subject to extending the
495
static snd_pcm_uframes_t siu_pcm_pointer_dma(struct snd_pcm_substream *ss)
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;
503
struct siu_stream *siu_stream;
505
if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
506
siu_stream = &port_info->playback;
508
siu_stream = &port_info->capture;
511
* ptr is the offset into the buffer where the dma is currently at. We
512
* check if the dma buffer has just wrapped.
514
ptr = PERIOD_OFFSET(rt->dma_addr,
515
siu_stream->cur_period,
516
siu_stream->period_bytes) - rt->dma_addr;
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,
524
if (ptr >= siu_stream->buf_bytes)
527
return bytes_to_frames(ss->runtime, ptr);
530
static int siu_pcm_new(struct snd_card *card, struct snd_soc_dai *dai,
533
/* card->dev == socdev->dev, see snd_soc_new_pcms() */
534
struct siu_info *info = siu_i2s_data;
535
struct platform_device *pdev = to_platform_device(card->dev);
539
/* pdev->id selects between SIUA and SIUB */
540
if (pdev->id < 0 || pdev->id >= SIU_PORT_NUM)
543
info->port_id = pdev->id;
546
* While the siu has 2 ports, only one port can be on at a time (only 1
547
* SPB). So far all the boards using the siu had only one of the ports
548
* wired to a codec. To simplify things, we only register one port with
549
* alsa. In case both ports are needed, it should be changed here
551
for (i = pdev->id; i < pdev->id + 1; i++) {
552
struct siu_port **port_info = &siu_ports[i];
554
ret = siu_init_port(i, port_info, card);
558
ret = snd_pcm_lib_preallocate_pages_for_all(pcm,
559
SNDRV_DMA_TYPE_DEV, NULL,
560
SIU_BUFFER_BYTES_MAX, SIU_BUFFER_BYTES_MAX);
563
"snd_pcm_lib_preallocate_pages_for_all() err=%d",
568
(*port_info)->pcm = pcm;
571
tasklet_init(&(*port_info)->playback.tasklet, siu_io_tasklet,
572
(unsigned long)&(*port_info)->playback);
573
tasklet_init(&(*port_info)->capture.tasklet, siu_io_tasklet,
574
(unsigned long)&(*port_info)->capture);
577
dev_info(card->dev, "SuperH SIU driver initialized.\n");
581
siu_free_port(siu_ports[pdev->id]);
582
dev_err(card->dev, "SIU: failed to initialize.\n");
586
static void siu_pcm_free(struct snd_pcm *pcm)
588
struct platform_device *pdev = to_platform_device(pcm->card->dev);
589
struct siu_port *port_info = siu_ports[pdev->id];
591
tasklet_kill(&port_info->capture.tasklet);
592
tasklet_kill(&port_info->playback.tasklet);
594
siu_free_port(port_info);
595
snd_pcm_lib_preallocate_free_for_all(pcm);
597
dev_dbg(pcm->card->dev, "%s\n", __func__);
600
static struct snd_pcm_ops siu_pcm_ops = {
601
.open = siu_pcm_open,
602
.close = siu_pcm_close,
603
.ioctl = snd_pcm_lib_ioctl,
604
.hw_params = siu_pcm_hw_params,
605
.hw_free = siu_pcm_hw_free,
606
.prepare = siu_pcm_prepare,
607
.trigger = siu_pcm_trigger,
608
.pointer = siu_pcm_pointer_dma,
611
struct snd_soc_platform_driver siu_platform = {
613
.pcm_new = siu_pcm_new,
614
.pcm_free = siu_pcm_free,
616
EXPORT_SYMBOL_GPL(siu_platform);