1 /*
2 * File: sound/soc/blackfin/bf5xx-tdm-pcm.c
3 * Author: Barry Song <Barry.Song@analog.com>
4 *
5 * Created: Tue June 06 2009
6 * Description: DMA driver for tdm codec
7 *
8 * Modified:
9 * Copyright 2009 Analog Devices Inc.
10 *
11 * Bugs: Enter bugs at http://blackfin.uclinux.org/
12 *
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.
17 *
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.
22 *
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
27 */
28
29 #include <linux/module.h>
30 #include <linux/init.h>
31 #include <linux/platform_device.h>
32 #include <linux/dma-mapping.h>
33 #include <linux/gfp.h>
34
35 #include <sound/core.h>
36 #include <sound/pcm.h>
37 #include <sound/pcm_params.h>
38 #include <sound/soc.h>
39
40 #include <asm/dma.h>
41
42 #include "bf5xx-tdm-pcm.h"
43 #include "bf5xx-tdm.h"
44 #include "bf5xx-sport.h"
45
46 #define PCM_BUFFER_MAX 0x8000
47 #define FRAGMENT_SIZE_MIN (4*1024)
48 #define FRAGMENTS_MIN 2
49 #define FRAGMENTS_MAX 32
50
51 static void bf5xx_dma_irq(void *data)
52 {
53 struct snd_pcm_substream *pcm = data;
54 snd_pcm_period_elapsed(pcm);
55 }
56
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,
69 };
70
71 static int bf5xx_pcm_hw_params(struct snd_pcm_substream *substream,
72 struct snd_pcm_hw_params *params)
73 {
74 size_t size = bf5xx_pcm_hardware.buffer_bytes_max;
75 snd_pcm_lib_malloc_pages(substream, size * 4);
76
77 return 0;
78 }
79
80 static int bf5xx_pcm_hw_free(struct snd_pcm_substream *substream)
81 {
82 snd_pcm_lib_free_pages(substream);
83
84 return 0;
85 }
86
87 static int bf5xx_pcm_prepare(struct snd_pcm_substream *substream)
88 {
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);
92
93 fragsize_bytes /= runtime->channels;
94 /* inflate the fragsize to match the dma width of SPORT */
95 fragsize_bytes *= 8;
96
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);
105 }
106
107 return 0;
108 }
109
110 static int bf5xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
111 {
112 struct snd_pcm_runtime *runtime = substream->runtime;
113 struct sport_device *sport = runtime->private_data;
114 int ret = 0;
115
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;
133 }
134
135 return ret;
136 }
137
138 static snd_pcm_uframes_t bf5xx_pcm_pointer(struct snd_pcm_substream *substream)
139 {
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;
144
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);
151 }
152 return frames;
153 }
154
155 static int bf5xx_pcm_open(struct snd_pcm_substream *substream)
156 {
157 struct snd_soc_pcm_runtime *rtd = substream->private_data;
158 struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
159 struct sport_device *sport_handle = snd_soc_dai_get_drvdata(cpu_dai);
160 struct snd_pcm_runtime *runtime = substream->runtime;
161 struct snd_dma_buffer *buf = &substream->dma_buffer;
162
163 int ret = 0;
164
165 snd_soc_set_runtime_hwparams(substream, &bf5xx_pcm_hardware);
166
167 ret = snd_pcm_hw_constraint_integer(runtime,
168 SNDRV_PCM_HW_PARAM_PERIODS);
169 if (ret < 0)
170 goto out;
171
172 if (sport_handle != NULL) {
173 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
174 sport_handle->tx_buf = buf->area;
175 else
176 sport_handle->rx_buf = buf->area;
177
178 runtime->private_data = sport_handle;
179 } else {
180 pr_err("sport_handle is NULL\n");
181 ret = -ENODEV;
182 }
183 out:
184 return ret;
185 }
186
187 static int bf5xx_pcm_copy(struct snd_pcm_substream *substream, int channel,
188 snd_pcm_uframes_t pos, void *buf, snd_pcm_uframes_t count)
189 {
190 struct snd_pcm_runtime *runtime = substream->runtime;
191 struct sport_device *sport = runtime->private_data;
192 struct bf5xx_tdm_port *tdm_port = sport->private_data;
193 unsigned int *src;
194 unsigned int *dst;
195 int i;
196
197 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
198 src = buf;
199 dst = (unsigned int *)substream->runtime->dma_area;
200
201 dst += pos * 8;
202 while (count--) {
203 for (i = 0; i < substream->runtime->channels; i++)
204 *(dst + tdm_port->tx_map[i]) = *src++;
205 dst += 8;
206 }
207 } else {
208 src = (unsigned int *)substream->runtime->dma_area;
209 dst = buf;
210
211 src += pos * 8;
212 while (count--) {
213 for (i = 0; i < substream->runtime->channels; i++)
214 *dst++ = *(src + tdm_port->rx_map[i]);
215 src += 8;
216 }
217 }
218
219 return 0;
220 }
221
222 static int bf5xx_pcm_silence(struct snd_pcm_substream *substream,
223 int channel, snd_pcm_uframes_t pos, snd_pcm_uframes_t count)
224 {
225 unsigned char *buf = substream->runtime->dma_area;
226 buf += pos * 8 * 4;
227 memset(buf, '\0', count * 8 * 4);
228
229 return 0;
230 }
231
232
233 struct snd_pcm_ops bf5xx_pcm_tdm_ops = {
234 .open = bf5xx_pcm_open,
235 .ioctl = snd_pcm_lib_ioctl,
236 .hw_params = bf5xx_pcm_hw_params,
237 .hw_free = bf5xx_pcm_hw_free,
238 .prepare = bf5xx_pcm_prepare,
239 .trigger = bf5xx_pcm_trigger,
240 .pointer = bf5xx_pcm_pointer,
241 .copy = bf5xx_pcm_copy,
242 .silence = bf5xx_pcm_silence,
243 };
244
245 static int bf5xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
246 {
247 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
248 struct snd_dma_buffer *buf = &substream->dma_buffer;
249 size_t size = bf5xx_pcm_hardware.buffer_bytes_max;
250
251 buf->dev.type = SNDRV_DMA_TYPE_DEV;
252 buf->dev.dev = pcm->card->dev;
253 buf->private_data = NULL;
254 buf->area = dma_alloc_coherent(pcm->card->dev, size * 4,
255 &buf->addr, GFP_KERNEL);
256 if (!buf->area) {
257 pr_err("Failed to allocate dma memory - Please increase uncached DMA memory region\n");
258 return -ENOMEM;
259 }
260 buf->bytes = size;
261
262 return 0;
263 }
264
265 static void bf5xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
266 {
267 struct snd_pcm_substream *substream;
268 struct snd_dma_buffer *buf;
269 int stream;
270
271 for (stream = 0; stream < 2; stream++) {
272 substream = pcm->streams[stream].substream;
273 if (!substream)
274 continue;
275
276 buf = &substream->dma_buffer;
277 if (!buf->area)
278 continue;
279 dma_free_coherent(NULL, buf->bytes, buf->area, 0);
280 buf->area = NULL;
281 }
282 }
283
284 static u64 bf5xx_pcm_dmamask = DMA_BIT_MASK(32);
285
286 static int bf5xx_pcm_tdm_new(struct snd_soc_pcm_runtime *rtd)
287 {
288 struct snd_card *card = rtd->card->snd_card;
289 struct snd_pcm *pcm = rtd->pcm;
290 int ret = 0;
291
292 if (!card->dev->dma_mask)
293 card->dev->dma_mask = &bf5xx_pcm_dmamask;
294 if (!card->dev->coherent_dma_mask)
295 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
296
297 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
298 ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
299 SNDRV_PCM_STREAM_PLAYBACK);
300 if (ret)
301 goto out;
302 }
303
304 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
305 ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
306 SNDRV_PCM_STREAM_CAPTURE);
307 if (ret)
308 goto out;
309 }
310 out:
311 return ret;
312 }
313
314 static struct snd_soc_platform_driver bf5xx_tdm_soc_platform = {
315 .ops = &bf5xx_pcm_tdm_ops,
316 .pcm_new = bf5xx_pcm_tdm_new,
317 .pcm_free = bf5xx_pcm_free_dma_buffers,
318 };
319
320 static int bf5xx_soc_platform_probe(struct platform_device *pdev)
321 {
322 return snd_soc_register_platform(&pdev->dev, &bf5xx_tdm_soc_platform);
323 }
324
325 static int bf5xx_soc_platform_remove(struct platform_device *pdev)
326 {
327 snd_soc_unregister_platform(&pdev->dev);
328 return 0;
329 }
330
331 static struct platform_driver bfin_tdm_driver = {
332 .driver = {
333 .name = "bfin-tdm-pcm-audio",
334 .owner = THIS_MODULE,
335 },
336
337 .probe = bf5xx_soc_platform_probe,
338 .remove = bf5xx_soc_platform_remove,
339 };
340
341 module_platform_driver(bfin_tdm_driver);
342
343 MODULE_AUTHOR("Barry Song");
344 MODULE_DESCRIPTION("ADI Blackfin TDM PCM DMA module");
345 MODULE_LICENSE("GPL");
346
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.