"[PATCH] Fix leaks on /proc/{*/sched,sched_debug,timer_list,timer_stats}" and
[mmotm.git] / sound / soc / blackfin / bf5xx-tdm-pcm.c
bloba8c73cbbd68512198e47b25f478aba52496dc6d1
1 /*
2 * File: sound/soc/blackfin/bf5xx-tdm-pcm.c
3 * Author: Barry Song <Barry.Song@analog.com>
5 * Created: Tue June 06 2009
6 * Description: DMA driver for tdm codec
8 * Modified:
9 * Copyright 2009 Analog Devices Inc.
11 * Bugs: Enter bugs at http://blackfin.uclinux.org/
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, see the file COPYING, or write
25 * to the Free Software Foundation, Inc.,
26 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
29 #include <linux/module.h>
30 #include <linux/init.h>
31 #include <linux/platform_device.h>
32 #include <linux/slab.h>
33 #include <linux/dma-mapping.h>
35 #include <sound/core.h>
36 #include <sound/pcm.h>
37 #include <sound/pcm_params.h>
38 #include <sound/soc.h>
40 #include <asm/dma.h>
42 #include "bf5xx-tdm-pcm.h"
43 #include "bf5xx-tdm.h"
44 #include "bf5xx-sport.h"
46 #define PCM_BUFFER_MAX 0x8000
47 #define FRAGMENT_SIZE_MIN (4*1024)
48 #define FRAGMENTS_MIN 2
49 #define FRAGMENTS_MAX 32
51 static void bf5xx_dma_irq(void *data)
53 struct snd_pcm_substream *pcm = data;
54 snd_pcm_period_elapsed(pcm);
57 static const struct snd_pcm_hardware bf5xx_pcm_hardware = {
58 .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
59 SNDRV_PCM_INFO_RESUME),
60 .formats = SNDRV_PCM_FMTBIT_S32_LE,
61 .rates = SNDRV_PCM_RATE_48000,
62 .channels_min = 2,
63 .channels_max = 8,
64 .buffer_bytes_max = PCM_BUFFER_MAX,
65 .period_bytes_min = FRAGMENT_SIZE_MIN,
66 .period_bytes_max = PCM_BUFFER_MAX/2,
67 .periods_min = FRAGMENTS_MIN,
68 .periods_max = FRAGMENTS_MAX,
71 static int bf5xx_pcm_hw_params(struct snd_pcm_substream *substream,
72 struct snd_pcm_hw_params *params)
74 size_t size = bf5xx_pcm_hardware.buffer_bytes_max;
75 snd_pcm_lib_malloc_pages(substream, size * 4);
77 return 0;
80 static int bf5xx_pcm_hw_free(struct snd_pcm_substream *substream)
82 snd_pcm_lib_free_pages(substream);
84 return 0;
87 static int bf5xx_pcm_prepare(struct snd_pcm_substream *substream)
89 struct snd_pcm_runtime *runtime = substream->runtime;
90 struct sport_device *sport = runtime->private_data;
91 int fragsize_bytes = frames_to_bytes(runtime, runtime->period_size);
93 fragsize_bytes /= runtime->channels;
94 /* inflate the fragsize to match the dma width of SPORT */
95 fragsize_bytes *= 8;
97 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
98 sport_set_tx_callback(sport, bf5xx_dma_irq, substream);
99 sport_config_tx_dma(sport, runtime->dma_area,
100 runtime->periods, fragsize_bytes);
101 } else {
102 sport_set_rx_callback(sport, bf5xx_dma_irq, substream);
103 sport_config_rx_dma(sport, runtime->dma_area,
104 runtime->periods, fragsize_bytes);
107 return 0;
110 static int bf5xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
112 struct snd_pcm_runtime *runtime = substream->runtime;
113 struct sport_device *sport = runtime->private_data;
114 int ret = 0;
116 switch (cmd) {
117 case SNDRV_PCM_TRIGGER_START:
118 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
119 sport_tx_start(sport);
120 else
121 sport_rx_start(sport);
122 break;
123 case SNDRV_PCM_TRIGGER_STOP:
124 case SNDRV_PCM_TRIGGER_SUSPEND:
125 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
126 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
127 sport_tx_stop(sport);
128 else
129 sport_rx_stop(sport);
130 break;
131 default:
132 ret = -EINVAL;
135 return ret;
138 static snd_pcm_uframes_t bf5xx_pcm_pointer(struct snd_pcm_substream *substream)
140 struct snd_pcm_runtime *runtime = substream->runtime;
141 struct sport_device *sport = runtime->private_data;
142 unsigned int diff;
143 snd_pcm_uframes_t frames;
145 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
146 diff = sport_curr_offset_tx(sport);
147 frames = diff / (8*4); /* 32 bytes per frame */
148 } else {
149 diff = sport_curr_offset_rx(sport);
150 frames = diff / (8*4);
152 return frames;
155 static int bf5xx_pcm_open(struct snd_pcm_substream *substream)
157 struct snd_pcm_runtime *runtime = substream->runtime;
158 int ret = 0;
160 snd_soc_set_runtime_hwparams(substream, &bf5xx_pcm_hardware);
162 ret = snd_pcm_hw_constraint_integer(runtime,
163 SNDRV_PCM_HW_PARAM_PERIODS);
164 if (ret < 0)
165 goto out;
167 if (sport_handle != NULL)
168 runtime->private_data = sport_handle;
169 else {
170 pr_err("sport_handle is NULL\n");
171 ret = -ENODEV;
173 out:
174 return ret;
177 static int bf5xx_pcm_copy(struct snd_pcm_substream *substream, int channel,
178 snd_pcm_uframes_t pos, void *buf, snd_pcm_uframes_t count)
180 struct snd_pcm_runtime *runtime = substream->runtime;
181 struct sport_device *sport = runtime->private_data;
182 struct bf5xx_tdm_port *tdm_port = sport->private_data;
183 unsigned int *src;
184 unsigned int *dst;
185 int i;
187 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
188 src = buf;
189 dst = (unsigned int *)substream->runtime->dma_area;
191 dst += pos * 8;
192 while (count--) {
193 for (i = 0; i < substream->runtime->channels; i++)
194 *(dst + tdm_port->tx_map[i]) = *src++;
195 dst += 8;
197 } else {
198 src = (unsigned int *)substream->runtime->dma_area;
199 dst = buf;
201 src += pos * 8;
202 while (count--) {
203 for (i = 0; i < substream->runtime->channels; i++)
204 *dst++ = *(src + tdm_port->rx_map[i]);
205 src += 8;
209 return 0;
212 static int bf5xx_pcm_silence(struct snd_pcm_substream *substream,
213 int channel, snd_pcm_uframes_t pos, snd_pcm_uframes_t count)
215 unsigned char *buf = substream->runtime->dma_area;
216 buf += pos * 8 * 4;
217 memset(buf, '\0', count * 8 * 4);
219 return 0;
223 struct snd_pcm_ops bf5xx_pcm_tdm_ops = {
224 .open = bf5xx_pcm_open,
225 .ioctl = snd_pcm_lib_ioctl,
226 .hw_params = bf5xx_pcm_hw_params,
227 .hw_free = bf5xx_pcm_hw_free,
228 .prepare = bf5xx_pcm_prepare,
229 .trigger = bf5xx_pcm_trigger,
230 .pointer = bf5xx_pcm_pointer,
231 .copy = bf5xx_pcm_copy,
232 .silence = bf5xx_pcm_silence,
235 static int bf5xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
237 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
238 struct snd_dma_buffer *buf = &substream->dma_buffer;
239 size_t size = bf5xx_pcm_hardware.buffer_bytes_max;
241 buf->dev.type = SNDRV_DMA_TYPE_DEV;
242 buf->dev.dev = pcm->card->dev;
243 buf->private_data = NULL;
244 buf->area = dma_alloc_coherent(pcm->card->dev, size * 4,
245 &buf->addr, GFP_KERNEL);
246 if (!buf->area) {
247 pr_err("Failed to allocate dma memory \
248 Please increase uncached DMA memory region\n");
249 return -ENOMEM;
251 buf->bytes = size;
253 if (stream == SNDRV_PCM_STREAM_PLAYBACK)
254 sport_handle->tx_buf = buf->area;
255 else
256 sport_handle->rx_buf = buf->area;
258 return 0;
261 static void bf5xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
263 struct snd_pcm_substream *substream;
264 struct snd_dma_buffer *buf;
265 int stream;
267 for (stream = 0; stream < 2; stream++) {
268 substream = pcm->streams[stream].substream;
269 if (!substream)
270 continue;
272 buf = &substream->dma_buffer;
273 if (!buf->area)
274 continue;
275 dma_free_coherent(NULL, buf->bytes, buf->area, 0);
276 buf->area = NULL;
278 if (sport_handle)
279 sport_done(sport_handle);
282 static u64 bf5xx_pcm_dmamask = DMA_BIT_MASK(32);
284 static int bf5xx_pcm_tdm_new(struct snd_card *card, struct snd_soc_dai *dai,
285 struct snd_pcm *pcm)
287 int ret = 0;
289 if (!card->dev->dma_mask)
290 card->dev->dma_mask = &bf5xx_pcm_dmamask;
291 if (!card->dev->coherent_dma_mask)
292 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
294 if (dai->playback.channels_min) {
295 ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
296 SNDRV_PCM_STREAM_PLAYBACK);
297 if (ret)
298 goto out;
301 if (dai->capture.channels_min) {
302 ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
303 SNDRV_PCM_STREAM_CAPTURE);
304 if (ret)
305 goto out;
307 out:
308 return ret;
311 struct snd_soc_platform bf5xx_tdm_soc_platform = {
312 .name = "bf5xx-audio",
313 .pcm_ops = &bf5xx_pcm_tdm_ops,
314 .pcm_new = bf5xx_pcm_tdm_new,
315 .pcm_free = bf5xx_pcm_free_dma_buffers,
317 EXPORT_SYMBOL_GPL(bf5xx_tdm_soc_platform);
319 static int __init bfin_pcm_tdm_init(void)
321 return snd_soc_register_platform(&bf5xx_tdm_soc_platform);
323 module_init(bfin_pcm_tdm_init);
325 static void __exit bfin_pcm_tdm_exit(void)
327 snd_soc_unregister_platform(&bf5xx_tdm_soc_platform);
329 module_exit(bfin_pcm_tdm_exit);
331 MODULE_AUTHOR("Barry Song");
332 MODULE_DESCRIPTION("ADI Blackfin TDM PCM DMA module");
333 MODULE_LICENSE("GPL");