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21#include <linux/clk.h>
22#include <linux/delay.h>
23#include <linux/device.h>
24#include <linux/dma-mapping.h>
25#include <linux/init.h>
26#include <linux/interrupt.h>
27#include <linux/module.h>
28#include <linux/platform_device.h>
29#include <linux/slab.h>
30#include <linux/dmaengine.h>
31
32#include <sound/core.h>
33#include <sound/initval.h>
34#include <sound/pcm.h>
35#include <sound/pcm_params.h>
36#include <sound/soc.h>
37
38#include <mach/dma.h>
39#include "mxs-pcm.h"
40
41static struct snd_pcm_hardware snd_mxs_hardware = {
42 .info = SNDRV_PCM_INFO_MMAP |
43 SNDRV_PCM_INFO_MMAP_VALID |
44 SNDRV_PCM_INFO_PAUSE |
45 SNDRV_PCM_INFO_RESUME |
46 SNDRV_PCM_INFO_INTERLEAVED,
47 .formats = SNDRV_PCM_FMTBIT_S16_LE |
48 SNDRV_PCM_FMTBIT_S20_3LE |
49 SNDRV_PCM_FMTBIT_S24_LE,
50 .channels_min = 2,
51 .channels_max = 2,
52 .period_bytes_min = 32,
53 .period_bytes_max = 8192,
54 .periods_min = 1,
55 .periods_max = 52,
56 .buffer_bytes_max = 64 * 1024,
57 .fifo_size = 32,
58
59};
60
61static void audio_dma_irq(void *data)
62{
63 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)data;
64 struct snd_pcm_runtime *runtime = substream->runtime;
65 struct mxs_pcm_runtime_data *iprtd = runtime->private_data;
66
67 iprtd->offset += iprtd->period_bytes;
68 iprtd->offset %= iprtd->period_bytes * iprtd->periods;
69 snd_pcm_period_elapsed(substream);
70}
71
72static bool filter(struct dma_chan *chan, void *param)
73{
74 struct mxs_pcm_runtime_data *iprtd = param;
75 struct mxs_pcm_dma_params *dma_params = iprtd->dma_params;
76
77 if (!mxs_dma_is_apbx(chan))
78 return false;
79
80 if (chan->chan_id != dma_params->chan_num)
81 return false;
82
83 chan->private = &iprtd->dma_data;
84
85 return true;
86}
87
88static int mxs_dma_alloc(struct snd_pcm_substream *substream,
89 struct snd_pcm_hw_params *params)
90{
91 struct snd_soc_pcm_runtime *rtd = substream->private_data;
92 struct snd_pcm_runtime *runtime = substream->runtime;
93 struct mxs_pcm_runtime_data *iprtd = runtime->private_data;
94 dma_cap_mask_t mask;
95
96 iprtd->dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
97
98 dma_cap_zero(mask);
99 dma_cap_set(DMA_SLAVE, mask);
100 iprtd->dma_data.chan_irq = iprtd->dma_params->chan_irq;
101 iprtd->dma_chan = dma_request_channel(mask, filter, iprtd);
102 if (!iprtd->dma_chan)
103 return -EINVAL;
104
105 return 0;
106}
107
108static int snd_mxs_pcm_hw_params(struct snd_pcm_substream *substream,
109 struct snd_pcm_hw_params *params)
110{
111 struct snd_pcm_runtime *runtime = substream->runtime;
112 struct mxs_pcm_runtime_data *iprtd = runtime->private_data;
113 unsigned long dma_addr;
114 struct dma_chan *chan;
115 int ret;
116
117 ret = mxs_dma_alloc(substream, params);
118 if (ret)
119 return ret;
120 chan = iprtd->dma_chan;
121
122 iprtd->size = params_buffer_bytes(params);
123 iprtd->periods = params_periods(params);
124 iprtd->period_bytes = params_period_bytes(params);
125 iprtd->offset = 0;
126 iprtd->period_time = HZ / (params_rate(params) /
127 params_period_size(params));
128
129 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
130
131 dma_addr = runtime->dma_addr;
132
133 iprtd->buf = substream->dma_buffer.area;
134
135 iprtd->desc = chan->device->device_prep_dma_cyclic(chan, dma_addr,
136 iprtd->period_bytes * iprtd->periods,
137 iprtd->period_bytes,
138 substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
139 DMA_TO_DEVICE : DMA_FROM_DEVICE);
140 if (!iprtd->desc) {
141 dev_err(&chan->dev->device, "cannot prepare slave dma\n");
142 return -EINVAL;
143 }
144
145 iprtd->desc->callback = audio_dma_irq;
146 iprtd->desc->callback_param = substream;
147
148 return 0;
149}
150
151static int snd_mxs_pcm_hw_free(struct snd_pcm_substream *substream)
152{
153 struct snd_pcm_runtime *runtime = substream->runtime;
154 struct mxs_pcm_runtime_data *iprtd = runtime->private_data;
155
156 if (iprtd->dma_chan) {
157 dma_release_channel(iprtd->dma_chan);
158 iprtd->dma_chan = NULL;
159 }
160
161 return 0;
162}
163
164static int snd_mxs_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
165{
166 struct snd_pcm_runtime *runtime = substream->runtime;
167 struct mxs_pcm_runtime_data *iprtd = runtime->private_data;
168
169 switch (cmd) {
170 case SNDRV_PCM_TRIGGER_START:
171 case SNDRV_PCM_TRIGGER_RESUME:
172 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
173 dmaengine_submit(iprtd->desc);
174
175 break;
176 case SNDRV_PCM_TRIGGER_STOP:
177 case SNDRV_PCM_TRIGGER_SUSPEND:
178 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
179 dmaengine_terminate_all(iprtd->dma_chan);
180
181 break;
182 default:
183 return -EINVAL;
184 }
185
186 return 0;
187}
188
189static snd_pcm_uframes_t snd_mxs_pcm_pointer(
190 struct snd_pcm_substream *substream)
191{
192 struct snd_pcm_runtime *runtime = substream->runtime;
193 struct mxs_pcm_runtime_data *iprtd = runtime->private_data;
194
195 return bytes_to_frames(substream->runtime, iprtd->offset);
196}
197
198static int snd_mxs_open(struct snd_pcm_substream *substream)
199{
200 struct snd_pcm_runtime *runtime = substream->runtime;
201 struct mxs_pcm_runtime_data *iprtd;
202 int ret;
203
204 iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL);
205 if (iprtd == NULL)
206 return -ENOMEM;
207 runtime->private_data = iprtd;
208
209 ret = snd_pcm_hw_constraint_integer(substream->runtime,
210 SNDRV_PCM_HW_PARAM_PERIODS);
211 if (ret < 0) {
212 kfree(iprtd);
213 return ret;
214 }
215
216 snd_soc_set_runtime_hwparams(substream, &snd_mxs_hardware);
217
218 return 0;
219}
220
221static int snd_mxs_close(struct snd_pcm_substream *substream)
222{
223 struct snd_pcm_runtime *runtime = substream->runtime;
224 struct mxs_pcm_runtime_data *iprtd = runtime->private_data;
225
226 kfree(iprtd);
227
228 return 0;
229}
230
231static int snd_mxs_pcm_mmap(struct snd_pcm_substream *substream,
232 struct vm_area_struct *vma)
233{
234 struct snd_pcm_runtime *runtime = substream->runtime;
235
236 return dma_mmap_writecombine(substream->pcm->card->dev, vma,
237 runtime->dma_area,
238 runtime->dma_addr,
239 runtime->dma_bytes);
240}
241
242static struct snd_pcm_ops mxs_pcm_ops = {
243 .open = snd_mxs_open,
244 .close = snd_mxs_close,
245 .ioctl = snd_pcm_lib_ioctl,
246 .hw_params = snd_mxs_pcm_hw_params,
247 .hw_free = snd_mxs_pcm_hw_free,
248 .trigger = snd_mxs_pcm_trigger,
249 .pointer = snd_mxs_pcm_pointer,
250 .mmap = snd_mxs_pcm_mmap,
251};
252
253static int mxs_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
254{
255 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
256 struct snd_dma_buffer *buf = &substream->dma_buffer;
257 size_t size = snd_mxs_hardware.buffer_bytes_max;
258
259 buf->dev.type = SNDRV_DMA_TYPE_DEV;
260 buf->dev.dev = pcm->card->dev;
261 buf->private_data = NULL;
262 buf->area = dma_alloc_writecombine(pcm->card->dev, size,
263 &buf->addr, GFP_KERNEL);
264 if (!buf->area)
265 return -ENOMEM;
266 buf->bytes = size;
267
268 return 0;
269}
270
271static u64 mxs_pcm_dmamask = DMA_BIT_MASK(32);
272static int mxs_pcm_new(struct snd_soc_pcm_runtime *rtd)
273{
274 struct snd_card *card = rtd->card->snd_card;
275 struct snd_pcm *pcm = rtd->pcm;
276 int ret = 0;
277
278 if (!card->dev->dma_mask)
279 card->dev->dma_mask = &mxs_pcm_dmamask;
280 if (!card->dev->coherent_dma_mask)
281 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
282
283 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
284 ret = mxs_pcm_preallocate_dma_buffer(pcm,
285 SNDRV_PCM_STREAM_PLAYBACK);
286 if (ret)
287 goto out;
288 }
289
290 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
291 ret = mxs_pcm_preallocate_dma_buffer(pcm,
292 SNDRV_PCM_STREAM_CAPTURE);
293 if (ret)
294 goto out;
295 }
296
297out:
298 return ret;
299}
300
301static void mxs_pcm_free(struct snd_pcm *pcm)
302{
303 struct snd_pcm_substream *substream;
304 struct snd_dma_buffer *buf;
305 int stream;
306
307 for (stream = 0; stream < 2; stream++) {
308 substream = pcm->streams[stream].substream;
309 if (!substream)
310 continue;
311
312 buf = &substream->dma_buffer;
313 if (!buf->area)
314 continue;
315
316 dma_free_writecombine(pcm->card->dev, buf->bytes,
317 buf->area, buf->addr);
318 buf->area = NULL;
319 }
320}
321
322static struct snd_soc_platform_driver mxs_soc_platform = {
323 .ops = &mxs_pcm_ops,
324 .pcm_new = mxs_pcm_new,
325 .pcm_free = mxs_pcm_free,
326};
327
328static int __devinit mxs_soc_platform_probe(struct platform_device *pdev)
329{
330 return snd_soc_register_platform(&pdev->dev, &mxs_soc_platform);
331}
332
333static int __devexit mxs_soc_platform_remove(struct platform_device *pdev)
334{
335 snd_soc_unregister_platform(&pdev->dev);
336
337 return 0;
338}
339
340static struct platform_driver mxs_pcm_driver = {
341 .driver = {
342 .name = "mxs-pcm-audio",
343 .owner = THIS_MODULE,
344 },
345 .probe = mxs_soc_platform_probe,
346 .remove = __devexit_p(mxs_soc_platform_remove),
347};
348
349static int __init snd_mxs_pcm_init(void)
350{
351 return platform_driver_register(&mxs_pcm_driver);
352}
353module_init(snd_mxs_pcm_init);
354
355static void __exit snd_mxs_pcm_exit(void)
356{
357 platform_driver_unregister(&mxs_pcm_driver);
358}
359module_exit(snd_mxs_pcm_exit);
360
361MODULE_LICENSE("GPL");
362MODULE_ALIAS("platform:mxs-pcm-audio");
363
