ALSA: Separate common pxa2xx-pcm code
[linux-2.6.git] / sound / arm / pxa2xx-pcm-lib.c
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/module.h>
8 #include <linux/dma-mapping.h>
9
10 #include <sound/core.h>
11 #include <sound/pcm.h>
12 #include <sound/pcm_params.h>
13 #include <sound/pxa2xx-lib.h>
14
15 #include <asm/dma.h>
16 #include <mach/pxa-regs.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)
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         DCSR(prtd->dma_ch) &= ~DCSR_RUN;
141         DCSR(prtd->dma_ch) = 0;
142         DCMD(prtd->dma_ch) = 0;
143         *prtd->params->drcmr = prtd->dma_ch | DRCMR_MAPVLD;
144
145         return 0;
146 }
147 EXPORT_SYMBOL(__pxa2xx_pcm_prepare);
148
149 void pxa2xx_pcm_dma_irq(int dma_ch, void *dev_id)
150 {
151         struct snd_pcm_substream *substream = dev_id;
152         struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
153         int dcsr;
154
155         dcsr = DCSR(dma_ch);
156         DCSR(dma_ch) = dcsr & ~DCSR_STOPIRQEN;
157
158         if (dcsr & DCSR_ENDINTR) {
159                 snd_pcm_period_elapsed(substream);
160         } else {
161                 printk(KERN_ERR "%s: DMA error on channel %d (DCSR=%#x)\n",
162                         rtd->params->name, dma_ch, dcsr);
163                 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
164         }
165 }
166 EXPORT_SYMBOL(pxa2xx_pcm_dma_irq);
167
168 int __pxa2xx_pcm_open(struct snd_pcm_substream *substream)
169 {
170         struct snd_pcm_runtime *runtime = substream->runtime;
171         struct pxa2xx_runtime_data *rtd;
172         int ret;
173
174         runtime->hw = pxa2xx_pcm_hardware;
175
176         /*
177          * For mysterious reasons (and despite what the manual says)
178          * playback samples are lost if the DMA count is not a multiple
179          * of the DMA burst size.  Let's add a rule to enforce that.
180          */
181         ret = snd_pcm_hw_constraint_step(runtime, 0,
182                 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);
183         if (ret)
184                 goto out;
185
186         ret = snd_pcm_hw_constraint_step(runtime, 0,
187                 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32);
188         if (ret)
189                 goto out;
190
191         ret = snd_pcm_hw_constraint_integer(runtime,
192                                             SNDRV_PCM_HW_PARAM_PERIODS);
193         if (ret < 0)
194                 goto out;
195
196         ret = -ENOMEM;
197         rtd = kmalloc(sizeof(*rtd), GFP_KERNEL);
198         if (!rtd)
199                 goto out;
200         rtd->dma_desc_array =
201                 dma_alloc_writecombine(substream->pcm->card->dev, PAGE_SIZE,
202                                        &rtd->dma_desc_array_phys, GFP_KERNEL);
203         if (!rtd->dma_desc_array)
204                 goto err1;
205
206         runtime->private_data = rtd;
207         return 0;
208
209  err1:
210         kfree(rtd);
211  out:
212         return ret;
213 }
214 EXPORT_SYMBOL(__pxa2xx_pcm_open);
215
216 int __pxa2xx_pcm_close(struct snd_pcm_substream *substream)
217 {
218         struct snd_pcm_runtime *runtime = substream->runtime;
219         struct pxa2xx_runtime_data *rtd = runtime->private_data;
220
221         dma_free_writecombine(substream->pcm->card->dev, PAGE_SIZE,
222                               rtd->dma_desc_array, rtd->dma_desc_array_phys);
223         kfree(rtd);
224         return 0;
225 }
226 EXPORT_SYMBOL(__pxa2xx_pcm_close);
227
228 int pxa2xx_pcm_mmap(struct snd_pcm_substream *substream,
229         struct vm_area_struct *vma)
230 {
231         struct snd_pcm_runtime *runtime = substream->runtime;
232         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
233                                      runtime->dma_area,
234                                      runtime->dma_addr,
235                                      runtime->dma_bytes);
236 }
237 EXPORT_SYMBOL(pxa2xx_pcm_mmap);
238
239 int pxa2xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
240 {
241         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
242         struct snd_dma_buffer *buf = &substream->dma_buffer;
243         size_t size = pxa2xx_pcm_hardware.buffer_bytes_max;
244         buf->dev.type = SNDRV_DMA_TYPE_DEV;
245         buf->dev.dev = pcm->card->dev;
246         buf->private_data = NULL;
247         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
248                                            &buf->addr, GFP_KERNEL);
249         if (!buf->area)
250                 return -ENOMEM;
251         buf->bytes = size;
252         return 0;
253 }
254 EXPORT_SYMBOL(pxa2xx_pcm_preallocate_dma_buffer);
255
256 void pxa2xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
257 {
258         struct snd_pcm_substream *substream;
259         struct snd_dma_buffer *buf;
260         int stream;
261
262         for (stream = 0; stream < 2; stream++) {
263                 substream = pcm->streams[stream].substream;
264                 if (!substream)
265                         continue;
266                 buf = &substream->dma_buffer;
267                 if (!buf->area)
268                         continue;
269                 dma_free_writecombine(pcm->card->dev, buf->bytes,
270                                       buf->area, buf->addr);
271                 buf->area = NULL;
272         }
273 }
274 EXPORT_SYMBOL(pxa2xx_pcm_free_dma_buffers);
275
276 MODULE_AUTHOR("Nicolas Pitre");
277 MODULE_DESCRIPTION("Intel PXA2xx sound library");
278 MODULE_LICENSE("GPL");