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Linux/sound/arm/pxa2xx-pcm-lib.c

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  1 /*
  2  * This program is free software; you can redistribute it and/or modify
  3  * it under the terms of the GNU General Public License version 2 as
  4  * published by the Free Software Foundation.
  5  */
  6 
  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 
 20 static 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 
 37 int __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 }
 73 EXPORT_SYMBOL(__pxa2xx_pcm_hw_params);
 74 
 75 int __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 }
 85 EXPORT_SYMBOL(__pxa2xx_pcm_hw_free);
 86 
 87 int 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 }
118 EXPORT_SYMBOL(pxa2xx_pcm_trigger);
119 
120 snd_pcm_uframes_t
121 pxa2xx_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 }
134 EXPORT_SYMBOL(pxa2xx_pcm_pointer);
135 
136 int __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 }
153 EXPORT_SYMBOL(__pxa2xx_pcm_prepare);
154 
155 void 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_stream_lock(substream);
170                 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
171                 snd_pcm_stream_unlock(substream);
172         }
173 }
174 EXPORT_SYMBOL(pxa2xx_pcm_dma_irq);
175 
176 int __pxa2xx_pcm_open(struct snd_pcm_substream *substream)
177 {
178         struct snd_pcm_runtime *runtime = substream->runtime;
179         struct pxa2xx_runtime_data *rtd;
180         int ret;
181 
182         runtime->hw = pxa2xx_pcm_hardware;
183 
184         /*
185          * For mysterious reasons (and despite what the manual says)
186          * playback samples are lost if the DMA count is not a multiple
187          * of the DMA burst size.  Let's add a rule to enforce that.
188          */
189         ret = snd_pcm_hw_constraint_step(runtime, 0,
190                 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);
191         if (ret)
192                 goto out;
193 
194         ret = snd_pcm_hw_constraint_step(runtime, 0,
195                 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32);
196         if (ret)
197                 goto out;
198 
199         ret = snd_pcm_hw_constraint_integer(runtime,
200                                             SNDRV_PCM_HW_PARAM_PERIODS);
201         if (ret < 0)
202                 goto out;
203 
204         ret = -ENOMEM;
205         rtd = kzalloc(sizeof(*rtd), GFP_KERNEL);
206         if (!rtd)
207                 goto out;
208         rtd->dma_desc_array =
209                 dma_alloc_writecombine(substream->pcm->card->dev, PAGE_SIZE,
210                                        &rtd->dma_desc_array_phys, GFP_KERNEL);
211         if (!rtd->dma_desc_array)
212                 goto err1;
213 
214         rtd->dma_ch = -1;
215         runtime->private_data = rtd;
216         return 0;
217 
218  err1:
219         kfree(rtd);
220  out:
221         return ret;
222 }
223 EXPORT_SYMBOL(__pxa2xx_pcm_open);
224 
225 int __pxa2xx_pcm_close(struct snd_pcm_substream *substream)
226 {
227         struct snd_pcm_runtime *runtime = substream->runtime;
228         struct pxa2xx_runtime_data *rtd = runtime->private_data;
229 
230         dma_free_writecombine(substream->pcm->card->dev, PAGE_SIZE,
231                               rtd->dma_desc_array, rtd->dma_desc_array_phys);
232         kfree(rtd);
233         return 0;
234 }
235 EXPORT_SYMBOL(__pxa2xx_pcm_close);
236 
237 int pxa2xx_pcm_mmap(struct snd_pcm_substream *substream,
238         struct vm_area_struct *vma)
239 {
240         struct snd_pcm_runtime *runtime = substream->runtime;
241         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
242                                      runtime->dma_area,
243                                      runtime->dma_addr,
244                                      runtime->dma_bytes);
245 }
246 EXPORT_SYMBOL(pxa2xx_pcm_mmap);
247 
248 int pxa2xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
249 {
250         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
251         struct snd_dma_buffer *buf = &substream->dma_buffer;
252         size_t size = pxa2xx_pcm_hardware.buffer_bytes_max;
253         buf->dev.type = SNDRV_DMA_TYPE_DEV;
254         buf->dev.dev = pcm->card->dev;
255         buf->private_data = NULL;
256         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
257                                            &buf->addr, GFP_KERNEL);
258         if (!buf->area)
259                 return -ENOMEM;
260         buf->bytes = size;
261         return 0;
262 }
263 EXPORT_SYMBOL(pxa2xx_pcm_preallocate_dma_buffer);
264 
265 void pxa2xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
266 {
267         struct snd_pcm_substream *substream;
268         struct snd_dma_buffer *buf;
269         int stream;
270 
271         for (stream = 0; stream < 2; stream++) {
272                 substream = pcm->streams[stream].substream;
273                 if (!substream)
274                         continue;
275                 buf = &substream->dma_buffer;
276                 if (!buf->area)
277                         continue;
278                 dma_free_writecombine(pcm->card->dev, buf->bytes,
279                                       buf->area, buf->addr);
280                 buf->area = NULL;
281         }
282 }
283 EXPORT_SYMBOL(pxa2xx_pcm_free_dma_buffers);
284 
285 MODULE_AUTHOR("Nicolas Pitre");
286 MODULE_DESCRIPTION("Intel PXA2xx sound library");
287 MODULE_LICENSE("GPL");
288 

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