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Cliff Cai88740da2008-09-05 18:21:38 +08001/*
2 * File: sound/soc/blackfin/bf5xx-i2s-pcm.c
3 * Author: Cliff Cai <Cliff.Cai@analog.com>
4 *
5 * Created: Tue June 06 2008
6 * Description: DMA driver for i2s codec
7 *
8 * Modified:
9 * Copyright 2008 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>
Cliff Cai88740da2008-09-05 18:21:38 +080032#include <linux/dma-mapping.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090033#include <linux/gfp.h>
Cliff Cai88740da2008-09-05 18:21:38 +080034
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-i2s-pcm.h"
Cliff Cai88740da2008-09-05 18:21:38 +080043#include "bf5xx-sport.h"
44
45static void bf5xx_dma_irq(void *data)
46{
47 struct snd_pcm_substream *pcm = data;
48 snd_pcm_period_elapsed(pcm);
49}
50
51static const struct snd_pcm_hardware bf5xx_pcm_hardware = {
52 .info = SNDRV_PCM_INFO_INTERLEAVED |
53 SNDRV_PCM_INFO_MMAP |
54 SNDRV_PCM_INFO_MMAP_VALID |
55 SNDRV_PCM_INFO_BLOCK_TRANSFER,
56 .formats = SNDRV_PCM_FMTBIT_S16_LE |
57 SNDRV_PCM_FMTBIT_S24_LE |
58 SNDRV_PCM_FMTBIT_S32_LE,
59 .period_bytes_min = 32,
60 .period_bytes_max = 0x10000,
61 .periods_min = 1,
62 .periods_max = PAGE_SIZE/32,
63 .buffer_bytes_max = 0x20000, /* 128 kbytes */
64 .fifo_size = 16,
65};
66
67static int bf5xx_pcm_hw_params(struct snd_pcm_substream *substream,
68 struct snd_pcm_hw_params *params)
69{
70 size_t size = bf5xx_pcm_hardware.buffer_bytes_max;
71 snd_pcm_lib_malloc_pages(substream, size);
72
73 return 0;
74}
75
76static int bf5xx_pcm_hw_free(struct snd_pcm_substream *substream)
77{
78 snd_pcm_lib_free_pages(substream);
79
80 return 0;
81}
82
83static int bf5xx_pcm_prepare(struct snd_pcm_substream *substream)
84{
85 struct snd_pcm_runtime *runtime = substream->runtime;
86 struct sport_device *sport = runtime->private_data;
87 int period_bytes = frames_to_bytes(runtime, runtime->period_size);
88
89 pr_debug("%s enter\n", __func__);
90 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
91 sport_set_tx_callback(sport, bf5xx_dma_irq, substream);
92 sport_config_tx_dma(sport, runtime->dma_area,
93 runtime->periods, period_bytes);
94 } else {
95 sport_set_rx_callback(sport, bf5xx_dma_irq, substream);
96 sport_config_rx_dma(sport, runtime->dma_area,
97 runtime->periods, period_bytes);
98 }
99
100 return 0;
101}
102
103static int bf5xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
104{
105 struct snd_pcm_runtime *runtime = substream->runtime;
106 struct sport_device *sport = runtime->private_data;
107 int ret = 0;
108
109 pr_debug("%s enter\n", __func__);
110 switch (cmd) {
111 case SNDRV_PCM_TRIGGER_START:
112 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
113 sport_tx_start(sport);
114 else
115 sport_rx_start(sport);
116 break;
117 case SNDRV_PCM_TRIGGER_STOP:
118 case SNDRV_PCM_TRIGGER_SUSPEND:
119 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
120 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
121 sport_tx_stop(sport);
122 else
123 sport_rx_stop(sport);
124 break;
125 default:
126 ret = -EINVAL;
127 }
128
129 return ret;
130}
131
132static snd_pcm_uframes_t bf5xx_pcm_pointer(struct snd_pcm_substream *substream)
133{
134 struct snd_pcm_runtime *runtime = substream->runtime;
135 struct sport_device *sport = runtime->private_data;
136 unsigned int diff;
137 snd_pcm_uframes_t frames;
138 pr_debug("%s enter\n", __func__);
139 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
140 diff = sport_curr_offset_tx(sport);
Cliff Cai88740da2008-09-05 18:21:38 +0800141 } else {
142 diff = sport_curr_offset_rx(sport);
Cliff Cai88740da2008-09-05 18:21:38 +0800143 }
Mark Browne999dc52011-06-13 12:14:07 +0100144
145 /*
146 * TX at least can report one frame beyond the end of the
147 * buffer if we hit the wraparound case - clamp to within the
148 * buffer as the ALSA APIs require.
149 */
150 if (diff == snd_pcm_lib_buffer_bytes(substream))
151 diff = 0;
152
153 frames = bytes_to_frames(substream->runtime, diff);
154
Cliff Cai88740da2008-09-05 18:21:38 +0800155 return frames;
156}
157
158static int bf5xx_pcm_open(struct snd_pcm_substream *substream)
159{
Barry Song2c66cb92011-03-28 01:45:10 -0400160 struct snd_soc_pcm_runtime *rtd = substream->private_data;
161 struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
162 struct sport_device *sport_handle = snd_soc_dai_get_drvdata(cpu_dai);
Cliff Cai88740da2008-09-05 18:21:38 +0800163 struct snd_pcm_runtime *runtime = substream->runtime;
Barry Song2c66cb92011-03-28 01:45:10 -0400164 struct snd_dma_buffer *buf = &substream->dma_buffer;
Cliff Cai88740da2008-09-05 18:21:38 +0800165 int ret;
166
167 pr_debug("%s enter\n", __func__);
Barry Song2c66cb92011-03-28 01:45:10 -0400168
Cliff Cai88740da2008-09-05 18:21:38 +0800169 snd_soc_set_runtime_hwparams(substream, &bf5xx_pcm_hardware);
170
Mark Brownb83e60c2011-06-13 17:50:18 +0100171 ret = snd_pcm_hw_constraint_integer(runtime,
Cliff Cai88740da2008-09-05 18:21:38 +0800172 SNDRV_PCM_HW_PARAM_PERIODS);
173 if (ret < 0)
174 goto out;
175
Barry Song2c66cb92011-03-28 01:45:10 -0400176 if (sport_handle != NULL) {
177 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
178 sport_handle->tx_buf = buf->area;
179 else
180 sport_handle->rx_buf = buf->area;
181
Cliff Cai88740da2008-09-05 18:21:38 +0800182 runtime->private_data = sport_handle;
Barry Song2c66cb92011-03-28 01:45:10 -0400183 } else {
Cliff Cai88740da2008-09-05 18:21:38 +0800184 pr_err("sport_handle is NULL\n");
185 return -1;
186 }
187 return 0;
188
189 out:
190 return ret;
191}
192
193static int bf5xx_pcm_mmap(struct snd_pcm_substream *substream,
194 struct vm_area_struct *vma)
195{
196 struct snd_pcm_runtime *runtime = substream->runtime;
197 size_t size = vma->vm_end - vma->vm_start;
198 vma->vm_start = (unsigned long)runtime->dma_area;
199 vma->vm_end = vma->vm_start + size;
200 vma->vm_flags |= VM_SHARED;
201
202 return 0 ;
203}
204
Mark Brownb2a19d02009-01-17 19:14:26 +0000205static struct snd_pcm_ops bf5xx_pcm_i2s_ops = {
Cliff Cai88740da2008-09-05 18:21:38 +0800206 .open = bf5xx_pcm_open,
207 .ioctl = snd_pcm_lib_ioctl,
208 .hw_params = bf5xx_pcm_hw_params,
209 .hw_free = bf5xx_pcm_hw_free,
210 .prepare = bf5xx_pcm_prepare,
211 .trigger = bf5xx_pcm_trigger,
212 .pointer = bf5xx_pcm_pointer,
213 .mmap = bf5xx_pcm_mmap,
214};
215
216static int bf5xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
217{
218 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
219 struct snd_dma_buffer *buf = &substream->dma_buffer;
220 size_t size = bf5xx_pcm_hardware.buffer_bytes_max;
221
222 buf->dev.type = SNDRV_DMA_TYPE_DEV;
223 buf->dev.dev = pcm->card->dev;
224 buf->private_data = NULL;
225 buf->area = dma_alloc_coherent(pcm->card->dev, size,
226 &buf->addr, GFP_KERNEL);
227 if (!buf->area) {
Joe Perches2f1ff662010-01-31 12:02:12 -0800228 pr_err("Failed to allocate dma memory - Please increase uncached DMA memory region\n");
Cliff Cai88740da2008-09-05 18:21:38 +0800229 return -ENOMEM;
230 }
231 buf->bytes = size;
232
233 pr_debug("%s, area:%p, size:0x%08lx\n", __func__,
234 buf->area, buf->bytes);
235
Cliff Cai88740da2008-09-05 18:21:38 +0800236 return 0;
237}
238
239static void bf5xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
240{
241 struct snd_pcm_substream *substream;
242 struct snd_dma_buffer *buf;
243 int stream;
244
245 for (stream = 0; stream < 2; stream++) {
246 substream = pcm->streams[stream].substream;
247 if (!substream)
248 continue;
249
250 buf = &substream->dma_buffer;
251 if (!buf->area)
252 continue;
253 dma_free_coherent(NULL, buf->bytes, buf->area, 0);
254 buf->area = NULL;
255 }
Cliff Cai88740da2008-09-05 18:21:38 +0800256}
257
Yang Hongyang284901a2009-04-06 19:01:15 -0700258static u64 bf5xx_pcm_dmamask = DMA_BIT_MASK(32);
Cliff Cai88740da2008-09-05 18:21:38 +0800259
Axel Lin3b70e3b2011-09-21 14:40:58 +0800260static int bf5xx_pcm_i2s_new(struct snd_soc_pcm_runtime *rtd)
Cliff Cai88740da2008-09-05 18:21:38 +0800261{
Liam Girdwood552d1ef2011-06-07 16:08:33 +0100262 struct snd_card *card = rtd->card->snd_card;
263 struct snd_soc_dai *dai = rtd->cpu_dai;
264 struct snd_pcm *pcm = rtd->pcm;
Cliff Cai88740da2008-09-05 18:21:38 +0800265 int ret = 0;
266
267 pr_debug("%s enter\n", __func__);
268 if (!card->dev->dma_mask)
269 card->dev->dma_mask = &bf5xx_pcm_dmamask;
270 if (!card->dev->coherent_dma_mask)
Yang Hongyang284901a2009-04-06 19:01:15 -0700271 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
Cliff Cai88740da2008-09-05 18:21:38 +0800272
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +0000273 if (dai->driver->playback.channels_min) {
Cliff Cai88740da2008-09-05 18:21:38 +0800274 ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
275 SNDRV_PCM_STREAM_PLAYBACK);
276 if (ret)
277 goto out;
278 }
279
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +0000280 if (dai->driver->capture.channels_min) {
Cliff Cai88740da2008-09-05 18:21:38 +0800281 ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
282 SNDRV_PCM_STREAM_CAPTURE);
283 if (ret)
284 goto out;
285 }
286 out:
287 return ret;
288}
289
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +0000290static struct snd_soc_platform_driver bf5xx_i2s_soc_platform = {
291 .ops = &bf5xx_pcm_i2s_ops,
Cliff Cai88740da2008-09-05 18:21:38 +0800292 .pcm_new = bf5xx_pcm_i2s_new,
293 .pcm_free = bf5xx_pcm_free_dma_buffers,
294};
Cliff Cai88740da2008-09-05 18:21:38 +0800295
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +0000296static int __devinit bfin_i2s_soc_platform_probe(struct platform_device *pdev)
Mark Brown958e7922008-12-03 19:58:17 +0000297{
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +0000298 return snd_soc_register_platform(&pdev->dev, &bf5xx_i2s_soc_platform);
Mark Brown958e7922008-12-03 19:58:17 +0000299}
Mark Brown958e7922008-12-03 19:58:17 +0000300
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +0000301static int __devexit bfin_i2s_soc_platform_remove(struct platform_device *pdev)
Mark Brown958e7922008-12-03 19:58:17 +0000302{
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +0000303 snd_soc_unregister_platform(&pdev->dev);
304 return 0;
Mark Brown958e7922008-12-03 19:58:17 +0000305}
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +0000306
307static struct platform_driver bfin_i2s_pcm_driver = {
308 .driver = {
Mark Brownb83e60c2011-06-13 17:50:18 +0100309 .name = "bfin-i2s-pcm-audio",
310 .owner = THIS_MODULE,
Liam Girdwoodf0fba2a2010-03-17 20:15:21 +0000311 },
312
313 .probe = bfin_i2s_soc_platform_probe,
314 .remove = __devexit_p(bfin_i2s_soc_platform_remove),
315};
316
317static int __init snd_bfin_i2s_pcm_init(void)
318{
319 return platform_driver_register(&bfin_i2s_pcm_driver);
320}
321module_init(snd_bfin_i2s_pcm_init);
322
323static void __exit snd_bfin_i2s_pcm_exit(void)
324{
325 platform_driver_unregister(&bfin_i2s_pcm_driver);
326}
327module_exit(snd_bfin_i2s_pcm_exit);
Mark Brown958e7922008-12-03 19:58:17 +0000328
Cliff Cai88740da2008-09-05 18:21:38 +0800329MODULE_AUTHOR("Cliff Cai");
330MODULE_DESCRIPTION("ADI Blackfin I2S PCM DMA module");
331MODULE_LICENSE("GPL");