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7#include <linux/slab.h>
8#include <linux/module.h>
9#include <linux/dma-mapping.h>
10#include <linux/dmaengine.h>
11
12#include <sound/core.h>
13#include <sound/pcm.h>
14#include <sound/pcm_params.h>
15#include <sound/pxa2xx-lib.h>
16#include <sound/dmaengine_pcm.h>
17
18#include <mach/dma.h>
19
20#include "pxa2xx-pcm.h"
21
22static const struct snd_pcm_hardware pxa2xx_pcm_hardware = {
23 .info = SNDRV_PCM_INFO_MMAP |
24 SNDRV_PCM_INFO_MMAP_VALID |
25 SNDRV_PCM_INFO_INTERLEAVED |
26 SNDRV_PCM_INFO_PAUSE |
27 SNDRV_PCM_INFO_RESUME,
28 .formats = SNDRV_PCM_FMTBIT_S16_LE |
29 SNDRV_PCM_FMTBIT_S24_LE |
30 SNDRV_PCM_FMTBIT_S32_LE,
31 .period_bytes_min = 32,
32 .period_bytes_max = 8192 - 32,
33 .periods_min = 1,
34 .periods_max = PAGE_SIZE/sizeof(pxa_dma_desc),
35 .buffer_bytes_max = 128 * 1024,
36 .fifo_size = 32,
37};
38
39int __pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream,
40 struct snd_pcm_hw_params *params)
41{
42 struct snd_pcm_runtime *runtime = substream->runtime;
43 struct pxa2xx_runtime_data *rtd = runtime->private_data;
44 size_t totsize = params_buffer_bytes(params);
45 size_t period = params_period_bytes(params);
46 pxa_dma_desc *dma_desc;
47 dma_addr_t dma_buff_phys, next_desc_phys;
48 u32 dcmd = DCMD_INCSRCADDR | DCMD_FLOWTRG;
49
50
51 switch (rtd->params->addr_width) {
52 case DMA_SLAVE_BUSWIDTH_1_BYTE:
53 dcmd |= DCMD_WIDTH1;
54 break;
55 case DMA_SLAVE_BUSWIDTH_2_BYTES:
56 dcmd |= DCMD_WIDTH2;
57 break;
58 case DMA_SLAVE_BUSWIDTH_4_BYTES:
59 dcmd |= DCMD_WIDTH4;
60 break;
61 default:
62
63 break;
64 }
65
66 switch (rtd->params->maxburst) {
67 case 8:
68 dcmd |= DCMD_BURST8;
69 break;
70 case 16:
71 dcmd |= DCMD_BURST16;
72 break;
73 case 32:
74 dcmd |= DCMD_BURST32;
75 break;
76 }
77
78 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
79 runtime->dma_bytes = totsize;
80
81 dma_desc = rtd->dma_desc_array;
82 next_desc_phys = rtd->dma_desc_array_phys;
83 dma_buff_phys = runtime->dma_addr;
84 do {
85 next_desc_phys += sizeof(pxa_dma_desc);
86 dma_desc->ddadr = next_desc_phys;
87 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
88 dma_desc->dsadr = dma_buff_phys;
89 dma_desc->dtadr = rtd->params->addr;
90 } else {
91 dma_desc->dsadr = rtd->params->addr;
92 dma_desc->dtadr = dma_buff_phys;
93 }
94 if (period > totsize)
95 period = totsize;
96 dma_desc->dcmd = dcmd | period | DCMD_ENDIRQEN;
97 dma_desc++;
98 dma_buff_phys += period;
99 } while (totsize -= period);
100 dma_desc[-1].ddadr = rtd->dma_desc_array_phys;
101
102 return 0;
103}
104EXPORT_SYMBOL(__pxa2xx_pcm_hw_params);
105
106int __pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
107{
108 struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
109
110 if (rtd && rtd->params && rtd->params->filter_data) {
111 unsigned long req = *(unsigned long *) rtd->params->filter_data;
112 DRCMR(req) = 0;
113 }
114
115 snd_pcm_set_runtime_buffer(substream, NULL);
116 return 0;
117}
118EXPORT_SYMBOL(__pxa2xx_pcm_hw_free);
119
120int pxa2xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
121{
122 struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
123 int ret = 0;
124
125 switch (cmd) {
126 case SNDRV_PCM_TRIGGER_START:
127 DDADR(prtd->dma_ch) = prtd->dma_desc_array_phys;
128 DCSR(prtd->dma_ch) = DCSR_RUN;
129 break;
130
131 case SNDRV_PCM_TRIGGER_STOP:
132 case SNDRV_PCM_TRIGGER_SUSPEND:
133 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
134 DCSR(prtd->dma_ch) &= ~DCSR_RUN;
135 break;
136
137 case SNDRV_PCM_TRIGGER_RESUME:
138 DCSR(prtd->dma_ch) |= DCSR_RUN;
139 break;
140 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
141 DDADR(prtd->dma_ch) = prtd->dma_desc_array_phys;
142 DCSR(prtd->dma_ch) |= DCSR_RUN;
143 break;
144
145 default:
146 ret = -EINVAL;
147 }
148
149 return ret;
150}
151EXPORT_SYMBOL(pxa2xx_pcm_trigger);
152
153snd_pcm_uframes_t
154pxa2xx_pcm_pointer(struct snd_pcm_substream *substream)
155{
156 struct snd_pcm_runtime *runtime = substream->runtime;
157 struct pxa2xx_runtime_data *prtd = runtime->private_data;
158
159 dma_addr_t ptr = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
160 DSADR(prtd->dma_ch) : DTADR(prtd->dma_ch);
161 snd_pcm_uframes_t x = bytes_to_frames(runtime, ptr - runtime->dma_addr);
162
163 if (x == runtime->buffer_size)
164 x = 0;
165 return x;
166}
167EXPORT_SYMBOL(pxa2xx_pcm_pointer);
168
169int __pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
170{
171 struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
172 unsigned long req;
173
174 if (!prtd || !prtd->params)
175 return 0;
176
177 if (prtd->dma_ch == -1)
178 return -EINVAL;
179
180 DCSR(prtd->dma_ch) &= ~DCSR_RUN;
181 DCSR(prtd->dma_ch) = 0;
182 DCMD(prtd->dma_ch) = 0;
183 req = *(unsigned long *) prtd->params->filter_data;
184 DRCMR(req) = prtd->dma_ch | DRCMR_MAPVLD;
185
186 return 0;
187}
188EXPORT_SYMBOL(__pxa2xx_pcm_prepare);
189
190void pxa2xx_pcm_dma_irq(int dma_ch, void *dev_id)
191{
192 struct snd_pcm_substream *substream = dev_id;
193 int dcsr;
194
195 dcsr = DCSR(dma_ch);
196 DCSR(dma_ch) = dcsr & ~DCSR_STOPIRQEN;
197
198 if (dcsr & DCSR_ENDINTR) {
199 snd_pcm_period_elapsed(substream);
200 } else {
201 printk(KERN_ERR "DMA error on channel %d (DCSR=%#x)\n",
202 dma_ch, dcsr);
203 snd_pcm_stream_lock(substream);
204 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
205 snd_pcm_stream_unlock(substream);
206 }
207}
208EXPORT_SYMBOL(pxa2xx_pcm_dma_irq);
209
210int __pxa2xx_pcm_open(struct snd_pcm_substream *substream)
211{
212 struct snd_pcm_runtime *runtime = substream->runtime;
213 struct pxa2xx_runtime_data *rtd;
214 int ret;
215
216 runtime->hw = pxa2xx_pcm_hardware;
217
218
219
220
221
222
223 ret = snd_pcm_hw_constraint_step(runtime, 0,
224 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);
225 if (ret)
226 goto out;
227
228 ret = snd_pcm_hw_constraint_step(runtime, 0,
229 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32);
230 if (ret)
231 goto out;
232
233 ret = snd_pcm_hw_constraint_integer(runtime,
234 SNDRV_PCM_HW_PARAM_PERIODS);
235 if (ret < 0)
236 goto out;
237
238 ret = -ENOMEM;
239 rtd = kzalloc(sizeof(*rtd), GFP_KERNEL);
240 if (!rtd)
241 goto out;
242 rtd->dma_desc_array =
243 dma_alloc_writecombine(substream->pcm->card->dev, PAGE_SIZE,
244 &rtd->dma_desc_array_phys, GFP_KERNEL);
245 if (!rtd->dma_desc_array)
246 goto err1;
247
248 rtd->dma_ch = -1;
249 runtime->private_data = rtd;
250 return 0;
251
252 err1:
253 kfree(rtd);
254 out:
255 return ret;
256}
257EXPORT_SYMBOL(__pxa2xx_pcm_open);
258
259int __pxa2xx_pcm_close(struct snd_pcm_substream *substream)
260{
261 struct snd_pcm_runtime *runtime = substream->runtime;
262 struct pxa2xx_runtime_data *rtd = runtime->private_data;
263
264 dma_free_writecombine(substream->pcm->card->dev, PAGE_SIZE,
265 rtd->dma_desc_array, rtd->dma_desc_array_phys);
266 kfree(rtd);
267 return 0;
268}
269EXPORT_SYMBOL(__pxa2xx_pcm_close);
270
271int pxa2xx_pcm_mmap(struct snd_pcm_substream *substream,
272 struct vm_area_struct *vma)
273{
274 struct snd_pcm_runtime *runtime = substream->runtime;
275 return dma_mmap_writecombine(substream->pcm->card->dev, vma,
276 runtime->dma_area,
277 runtime->dma_addr,
278 runtime->dma_bytes);
279}
280EXPORT_SYMBOL(pxa2xx_pcm_mmap);
281
282int pxa2xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
283{
284 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
285 struct snd_dma_buffer *buf = &substream->dma_buffer;
286 size_t size = pxa2xx_pcm_hardware.buffer_bytes_max;
287 buf->dev.type = SNDRV_DMA_TYPE_DEV;
288 buf->dev.dev = pcm->card->dev;
289 buf->private_data = NULL;
290 buf->area = dma_alloc_writecombine(pcm->card->dev, size,
291 &buf->addr, GFP_KERNEL);
292 if (!buf->area)
293 return -ENOMEM;
294 buf->bytes = size;
295 return 0;
296}
297EXPORT_SYMBOL(pxa2xx_pcm_preallocate_dma_buffer);
298
299void pxa2xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
300{
301 struct snd_pcm_substream *substream;
302 struct snd_dma_buffer *buf;
303 int stream;
304
305 for (stream = 0; stream < 2; stream++) {
306 substream = pcm->streams[stream].substream;
307 if (!substream)
308 continue;
309 buf = &substream->dma_buffer;
310 if (!buf->area)
311 continue;
312 dma_free_writecombine(pcm->card->dev, buf->bytes,
313 buf->area, buf->addr);
314 buf->area = NULL;
315 }
316}
317EXPORT_SYMBOL(pxa2xx_pcm_free_dma_buffers);
318
319MODULE_AUTHOR("Nicolas Pitre");
320MODULE_DESCRIPTION("Intel PXA2xx sound library");
321MODULE_LICENSE("GPL");
322
