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