1
2
3
4
5
6
7
8
9
10
11
12
13#include <linux/module.h>
14#include <linux/init.h>
15#include <linux/platform_device.h>
16#include <linux/slab.h>
17#include <linux/dma-mapping.h>
18
19#include <sound/driver.h>
20#include <sound/core.h>
21#include <sound/pcm.h>
22#include <sound/pcm_params.h>
23#include <sound/soc.h>
24
25#include <asm/dma.h>
26#include <asm/hardware.h>
27#include <asm/arch/pxa-regs.h>
28#include <asm/arch/audio.h>
29
30#include "pxa2xx-pcm.h"
31
32static const struct snd_pcm_hardware pxa2xx_pcm_hardware = {
33 .info = SNDRV_PCM_INFO_MMAP |
34 SNDRV_PCM_INFO_MMAP_VALID |
35 SNDRV_PCM_INFO_INTERLEAVED |
36 SNDRV_PCM_INFO_PAUSE |
37 SNDRV_PCM_INFO_RESUME,
38 .formats = SNDRV_PCM_FMTBIT_S16_LE |
39 SNDRV_PCM_FMTBIT_S24_LE |
40 SNDRV_PCM_FMTBIT_S32_LE,
41 .period_bytes_min = 32,
42 .period_bytes_max = 8192 - 32,
43 .periods_min = 1,
44 .periods_max = PAGE_SIZE/sizeof(pxa_dma_desc),
45 .buffer_bytes_max = 128 * 1024,
46 .fifo_size = 32,
47};
48
49struct pxa2xx_runtime_data {
50 int dma_ch;
51 struct pxa2xx_pcm_dma_params *params;
52 pxa_dma_desc *dma_desc_array;
53 dma_addr_t dma_desc_array_phys;
54};
55
56static void pxa2xx_pcm_dma_irq(int dma_ch, void *dev_id)
57{
58 struct snd_pcm_substream *substream = dev_id;
59 struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
60 int dcsr;
61
62 dcsr = DCSR(dma_ch);
63 DCSR(dma_ch) = dcsr & ~DCSR_STOPIRQEN;
64
65 if (dcsr & DCSR_ENDINTR) {
66 snd_pcm_period_elapsed(substream);
67 } else {
68 printk( KERN_ERR "%s: DMA error on channel %d (DCSR=%#x)\n",
69 prtd->params->name, dma_ch, dcsr );
70 }
71}
72
73static int pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream,
74 struct snd_pcm_hw_params *params)
75{
76 struct snd_pcm_runtime *runtime = substream->runtime;
77 struct pxa2xx_runtime_data *prtd = runtime->private_data;
78 struct snd_soc_pcm_runtime *rtd = substream->private_data;
79 struct pxa2xx_pcm_dma_params *dma = rtd->dai->cpu_dai->dma_data;
80 size_t totsize = params_buffer_bytes(params);
81 size_t period = params_period_bytes(params);
82 pxa_dma_desc *dma_desc;
83 dma_addr_t dma_buff_phys, next_desc_phys;
84 int ret;
85
86
87
88 if (!dma)
89 return 0;
90
91
92
93 if (prtd->params == NULL) {
94 prtd->params = dma;
95 ret = pxa_request_dma(prtd->params->name, DMA_PRIO_LOW,
96 pxa2xx_pcm_dma_irq, substream);
97 if (ret < 0)
98 return ret;
99 prtd->dma_ch = ret;
100 } else if (prtd->params != dma) {
101 pxa_free_dma(prtd->dma_ch);
102 prtd->params = dma;
103 ret = pxa_request_dma(prtd->params->name, DMA_PRIO_LOW,
104 pxa2xx_pcm_dma_irq, substream);
105 if (ret < 0)
106 return ret;
107 prtd->dma_ch = ret;
108 }
109
110 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
111 runtime->dma_bytes = totsize;
112
113 dma_desc = prtd->dma_desc_array;
114 next_desc_phys = prtd->dma_desc_array_phys;
115 dma_buff_phys = runtime->dma_addr;
116 do {
117 next_desc_phys += sizeof(pxa_dma_desc);
118 dma_desc->ddadr = next_desc_phys;
119 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
120 dma_desc->dsadr = dma_buff_phys;
121 dma_desc->dtadr = prtd->params->dev_addr;
122 } else {
123 dma_desc->dsadr = prtd->params->dev_addr;
124 dma_desc->dtadr = dma_buff_phys;
125 }
126 if (period > totsize)
127 period = totsize;
128 dma_desc->dcmd = prtd->params->dcmd | period | DCMD_ENDIRQEN;
129 dma_desc++;
130 dma_buff_phys += period;
131 } while (totsize -= period);
132 dma_desc[-1].ddadr = prtd->dma_desc_array_phys;
133
134 return 0;
135}
136
137static int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
138{
139 struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
140
141 if (prtd && prtd->params)
142 *prtd->params->drcmr = 0;
143
144 if (prtd->dma_ch) {
145 snd_pcm_set_runtime_buffer(substream, NULL);
146 pxa_free_dma(prtd->dma_ch);
147 prtd->dma_ch = 0;
148 }
149
150 return 0;
151}
152
153static int pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
154{
155 struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
156
157 DCSR(prtd->dma_ch) &= ~DCSR_RUN;
158 DCSR(prtd->dma_ch) = 0;
159 DCMD(prtd->dma_ch) = 0;
160 *prtd->params->drcmr = prtd->dma_ch | DRCMR_MAPVLD;
161
162 return 0;
163}
164
165static int pxa2xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
166{
167 struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
168 int ret = 0;
169
170 switch (cmd) {
171 case SNDRV_PCM_TRIGGER_START:
172 DDADR(prtd->dma_ch) = prtd->dma_desc_array_phys;
173 DCSR(prtd->dma_ch) = DCSR_RUN;
174 break;
175
176 case SNDRV_PCM_TRIGGER_STOP:
177 case SNDRV_PCM_TRIGGER_SUSPEND:
178 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
179 DCSR(prtd->dma_ch) &= ~DCSR_RUN;
180 break;
181
182 case SNDRV_PCM_TRIGGER_RESUME:
183 DCSR(prtd->dma_ch) |= DCSR_RUN;
184 break;
185 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
186 DDADR(prtd->dma_ch) = prtd->dma_desc_array_phys;
187 DCSR(prtd->dma_ch) |= DCSR_RUN;
188 break;
189
190 default:
191 ret = -EINVAL;
192 }
193
194 return ret;
195}
196
197static snd_pcm_uframes_t
198pxa2xx_pcm_pointer(struct snd_pcm_substream *substream)
199{
200 struct snd_pcm_runtime *runtime = substream->runtime;
201 struct pxa2xx_runtime_data *prtd = runtime->private_data;
202
203 dma_addr_t ptr = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
204 DSADR(prtd->dma_ch) : DTADR(prtd->dma_ch);
205 snd_pcm_uframes_t x = bytes_to_frames(runtime, ptr - runtime->dma_addr);
206
207 if (x == runtime->buffer_size)
208 x = 0;
209 return x;
210}
211
212static int pxa2xx_pcm_open(struct snd_pcm_substream *substream)
213{
214 struct snd_pcm_runtime *runtime = substream->runtime;
215 struct pxa2xx_runtime_data *prtd;
216 int ret;
217
218 snd_soc_set_runtime_hwparams(substream, &pxa2xx_pcm_hardware);
219
220
221
222
223
224
225 ret = snd_pcm_hw_constraint_step(runtime, 0,
226 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);
227 if (ret)
228 goto out;
229
230 ret = snd_pcm_hw_constraint_step(runtime, 0,
231 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32);
232 if (ret)
233 goto out;
234
235 ret = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
236 if (ret < 0)
237 goto out;
238
239 prtd = kzalloc(sizeof(struct pxa2xx_runtime_data), GFP_KERNEL);
240 if (prtd == NULL) {
241 ret = -ENOMEM;
242 goto out;
243 }
244
245 prtd->dma_desc_array =
246 dma_alloc_writecombine(substream->pcm->card->dev, PAGE_SIZE,
247 &prtd->dma_desc_array_phys, GFP_KERNEL);
248 if (!prtd->dma_desc_array) {
249 ret = -ENOMEM;
250 goto err1;
251 }
252
253 runtime->private_data = prtd;
254 return 0;
255
256 err1:
257 kfree(prtd);
258 out:
259 return ret;
260}
261
262static int pxa2xx_pcm_close(struct snd_pcm_substream *substream)
263{
264 struct snd_pcm_runtime *runtime = substream->runtime;
265 struct pxa2xx_runtime_data *prtd = runtime->private_data;
266
267 dma_free_writecombine(substream->pcm->card->dev, PAGE_SIZE,
268 prtd->dma_desc_array, prtd->dma_desc_array_phys);
269 kfree(prtd);
270 return 0;
271}
272
273static int pxa2xx_pcm_mmap(struct snd_pcm_substream *substream,
274 struct vm_area_struct *vma)
275{
276 struct snd_pcm_runtime *runtime = substream->runtime;
277 return dma_mmap_writecombine(substream->pcm->card->dev, vma,
278 runtime->dma_area,
279 runtime->dma_addr,
280 runtime->dma_bytes);
281}
282
283struct snd_pcm_ops pxa2xx_pcm_ops = {
284 .open = pxa2xx_pcm_open,
285 .close = pxa2xx_pcm_close,
286 .ioctl = snd_pcm_lib_ioctl,
287 .hw_params = pxa2xx_pcm_hw_params,
288 .hw_free = pxa2xx_pcm_hw_free,
289 .prepare = pxa2xx_pcm_prepare,
290 .trigger = pxa2xx_pcm_trigger,
291 .pointer = pxa2xx_pcm_pointer,
292 .mmap = pxa2xx_pcm_mmap,
293};
294
295static int pxa2xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
296{
297 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
298 struct snd_dma_buffer *buf = &substream->dma_buffer;
299 size_t size = pxa2xx_pcm_hardware.buffer_bytes_max;
300 buf->dev.type = SNDRV_DMA_TYPE_DEV;
301 buf->dev.dev = pcm->card->dev;
302 buf->private_data = NULL;
303 buf->area = dma_alloc_writecombine(pcm->card->dev, size,
304 &buf->addr, GFP_KERNEL);
305 if (!buf->area)
306 return -ENOMEM;
307 buf->bytes = size;
308 return 0;
309}
310
311static void pxa2xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
312{
313 struct snd_pcm_substream *substream;
314 struct snd_dma_buffer *buf;
315 int stream;
316
317 for (stream = 0; stream < 2; stream++) {
318 substream = pcm->streams[stream].substream;
319 if (!substream)
320 continue;
321
322 buf = &substream->dma_buffer;
323 if (!buf->area)
324 continue;
325
326 dma_free_writecombine(pcm->card->dev, buf->bytes,
327 buf->area, buf->addr);
328 buf->area = NULL;
329 }
330}
331
332static u64 pxa2xx_pcm_dmamask = DMA_32BIT_MASK;
333
334int pxa2xx_pcm_new(struct snd_card *card, struct snd_soc_codec_dai *dai,
335 struct snd_pcm *pcm)
336{
337 int ret = 0;
338
339 if (!card->dev->dma_mask)
340 card->dev->dma_mask = &pxa2xx_pcm_dmamask;
341 if (!card->dev->coherent_dma_mask)
342 card->dev->coherent_dma_mask = DMA_32BIT_MASK;
343
344 if (dai->playback.channels_min) {
345 ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
346 SNDRV_PCM_STREAM_PLAYBACK);
347 if (ret)
348 goto out;
349 }
350
351 if (dai->capture.channels_min) {
352 ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
353 SNDRV_PCM_STREAM_CAPTURE);
354 if (ret)
355 goto out;
356 }
357 out:
358 return ret;
359}
360
361struct snd_soc_platform pxa2xx_soc_platform = {
362 .name = "pxa2xx-audio",
363 .pcm_ops = &pxa2xx_pcm_ops,
364 .pcm_new = pxa2xx_pcm_new,
365 .pcm_free = pxa2xx_pcm_free_dma_buffers,
366};
367
368EXPORT_SYMBOL_GPL(pxa2xx_soc_platform);
369
370MODULE_AUTHOR("Nicolas Pitre");
371MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module");
372MODULE_LICENSE("GPL");
373
