offb: use framebuffer_alloc() to allocate fb_info struct
[sfrench/cifs-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 <mach/dma.h>
16
17 #include "pxa2xx-pcm.h"
18
19 static const struct snd_pcm_hardware pxa2xx_pcm_hardware = {
20         .info                   = SNDRV_PCM_INFO_MMAP |
21                                   SNDRV_PCM_INFO_MMAP_VALID |
22                                   SNDRV_PCM_INFO_INTERLEAVED |
23                                   SNDRV_PCM_INFO_PAUSE |
24                                   SNDRV_PCM_INFO_RESUME,
25         .formats                = SNDRV_PCM_FMTBIT_S16_LE |
26                                         SNDRV_PCM_FMTBIT_S24_LE |
27                                         SNDRV_PCM_FMTBIT_S32_LE,
28         .period_bytes_min       = 32,
29         .period_bytes_max       = 8192 - 32,
30         .periods_min            = 1,
31         .periods_max            = PAGE_SIZE/sizeof(pxa_dma_desc),
32         .buffer_bytes_max       = 128 * 1024,
33         .fifo_size              = 32,
34 };
35
36 int __pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream,
37                                 struct snd_pcm_hw_params *params)
38 {
39         struct snd_pcm_runtime *runtime = substream->runtime;
40         struct pxa2xx_runtime_data *rtd = runtime->private_data;
41         size_t totsize = params_buffer_bytes(params);
42         size_t period = params_period_bytes(params);
43         pxa_dma_desc *dma_desc;
44         dma_addr_t dma_buff_phys, next_desc_phys;
45
46         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
47         runtime->dma_bytes = totsize;
48
49         dma_desc = rtd->dma_desc_array;
50         next_desc_phys = rtd->dma_desc_array_phys;
51         dma_buff_phys = runtime->dma_addr;
52         do {
53                 next_desc_phys += sizeof(pxa_dma_desc);
54                 dma_desc->ddadr = next_desc_phys;
55                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
56                         dma_desc->dsadr = dma_buff_phys;
57                         dma_desc->dtadr = rtd->params->dev_addr;
58                 } else {
59                         dma_desc->dsadr = rtd->params->dev_addr;
60                         dma_desc->dtadr = dma_buff_phys;
61                 }
62                 if (period > totsize)
63                         period = totsize;
64                 dma_desc->dcmd = rtd->params->dcmd | period | DCMD_ENDIRQEN;
65                 dma_desc++;
66                 dma_buff_phys += period;
67         } while (totsize -= period);
68         dma_desc[-1].ddadr = rtd->dma_desc_array_phys;
69
70         return 0;
71 }
72 EXPORT_SYMBOL(__pxa2xx_pcm_hw_params);
73
74 int __pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
75 {
76         struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
77
78         if (rtd && rtd->params)
79                 *rtd->params->drcmr = 0;
80
81         snd_pcm_set_runtime_buffer(substream, NULL);
82         return 0;
83 }
84 EXPORT_SYMBOL(__pxa2xx_pcm_hw_free);
85
86 int pxa2xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
87 {
88         struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
89         int ret = 0;
90
91         switch (cmd) {
92         case SNDRV_PCM_TRIGGER_START:
93                 DDADR(prtd->dma_ch) = prtd->dma_desc_array_phys;
94                 DCSR(prtd->dma_ch) = DCSR_RUN;
95                 break;
96
97         case SNDRV_PCM_TRIGGER_STOP:
98         case SNDRV_PCM_TRIGGER_SUSPEND:
99         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
100                 DCSR(prtd->dma_ch) &= ~DCSR_RUN;
101                 break;
102
103         case SNDRV_PCM_TRIGGER_RESUME:
104                 DCSR(prtd->dma_ch) |= DCSR_RUN;
105                 break;
106         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
107                 DDADR(prtd->dma_ch) = prtd->dma_desc_array_phys;
108                 DCSR(prtd->dma_ch) |= DCSR_RUN;
109                 break;
110
111         default:
112                 ret = -EINVAL;
113         }
114
115         return ret;
116 }
117 EXPORT_SYMBOL(pxa2xx_pcm_trigger);
118
119 snd_pcm_uframes_t
120 pxa2xx_pcm_pointer(struct snd_pcm_substream *substream)
121 {
122         struct snd_pcm_runtime *runtime = substream->runtime;
123         struct pxa2xx_runtime_data *prtd = runtime->private_data;
124
125         dma_addr_t ptr = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
126                          DSADR(prtd->dma_ch) : DTADR(prtd->dma_ch);
127         snd_pcm_uframes_t x = bytes_to_frames(runtime, ptr - runtime->dma_addr);
128
129         if (x == runtime->buffer_size)
130                 x = 0;
131         return x;
132 }
133 EXPORT_SYMBOL(pxa2xx_pcm_pointer);
134
135 int __pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
136 {
137         struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
138
139         DCSR(prtd->dma_ch) &= ~DCSR_RUN;
140         DCSR(prtd->dma_ch) = 0;
141         DCMD(prtd->dma_ch) = 0;
142         *prtd->params->drcmr = prtd->dma_ch | DRCMR_MAPVLD;
143
144         return 0;
145 }
146 EXPORT_SYMBOL(__pxa2xx_pcm_prepare);
147
148 void pxa2xx_pcm_dma_irq(int dma_ch, void *dev_id)
149 {
150         struct snd_pcm_substream *substream = dev_id;
151         struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
152         int dcsr;
153
154         dcsr = DCSR(dma_ch);
155         DCSR(dma_ch) = dcsr & ~DCSR_STOPIRQEN;
156
157         if (dcsr & DCSR_ENDINTR) {
158                 snd_pcm_period_elapsed(substream);
159         } else {
160                 printk(KERN_ERR "%s: DMA error on channel %d (DCSR=%#x)\n",
161                         rtd->params->name, dma_ch, dcsr);
162                 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
163         }
164 }
165 EXPORT_SYMBOL(pxa2xx_pcm_dma_irq);
166
167 int __pxa2xx_pcm_open(struct snd_pcm_substream *substream)
168 {
169         struct snd_pcm_runtime *runtime = substream->runtime;
170         struct pxa2xx_runtime_data *rtd;
171         int ret;
172
173         runtime->hw = pxa2xx_pcm_hardware;
174
175         /*
176          * For mysterious reasons (and despite what the manual says)
177          * playback samples are lost if the DMA count is not a multiple
178          * of the DMA burst size.  Let's add a rule to enforce that.
179          */
180         ret = snd_pcm_hw_constraint_step(runtime, 0,
181                 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);
182         if (ret)
183                 goto out;
184
185         ret = snd_pcm_hw_constraint_step(runtime, 0,
186                 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32);
187         if (ret)
188                 goto out;
189
190         ret = snd_pcm_hw_constraint_integer(runtime,
191                                             SNDRV_PCM_HW_PARAM_PERIODS);
192         if (ret < 0)
193                 goto out;
194
195         ret = -ENOMEM;
196         rtd = kzalloc(sizeof(*rtd), GFP_KERNEL);
197         if (!rtd)
198                 goto out;
199         rtd->dma_desc_array =
200                 dma_alloc_writecombine(substream->pcm->card->dev, PAGE_SIZE,
201                                        &rtd->dma_desc_array_phys, GFP_KERNEL);
202         if (!rtd->dma_desc_array)
203                 goto err1;
204
205         runtime->private_data = rtd;
206         return 0;
207
208  err1:
209         kfree(rtd);
210  out:
211         return ret;
212 }
213 EXPORT_SYMBOL(__pxa2xx_pcm_open);
214
215 int __pxa2xx_pcm_close(struct snd_pcm_substream *substream)
216 {
217         struct snd_pcm_runtime *runtime = substream->runtime;
218         struct pxa2xx_runtime_data *rtd = runtime->private_data;
219
220         dma_free_writecombine(substream->pcm->card->dev, PAGE_SIZE,
221                               rtd->dma_desc_array, rtd->dma_desc_array_phys);
222         kfree(rtd);
223         return 0;
224 }
225 EXPORT_SYMBOL(__pxa2xx_pcm_close);
226
227 int pxa2xx_pcm_mmap(struct snd_pcm_substream *substream,
228         struct vm_area_struct *vma)
229 {
230         struct snd_pcm_runtime *runtime = substream->runtime;
231         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
232                                      runtime->dma_area,
233                                      runtime->dma_addr,
234                                      runtime->dma_bytes);
235 }
236 EXPORT_SYMBOL(pxa2xx_pcm_mmap);
237
238 int pxa2xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
239 {
240         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
241         struct snd_dma_buffer *buf = &substream->dma_buffer;
242         size_t size = pxa2xx_pcm_hardware.buffer_bytes_max;
243         buf->dev.type = SNDRV_DMA_TYPE_DEV;
244         buf->dev.dev = pcm->card->dev;
245         buf->private_data = NULL;
246         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
247                                            &buf->addr, GFP_KERNEL);
248         if (!buf->area)
249                 return -ENOMEM;
250         buf->bytes = size;
251         return 0;
252 }
253 EXPORT_SYMBOL(pxa2xx_pcm_preallocate_dma_buffer);
254
255 void pxa2xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
256 {
257         struct snd_pcm_substream *substream;
258         struct snd_dma_buffer *buf;
259         int stream;
260
261         for (stream = 0; stream < 2; stream++) {
262                 substream = pcm->streams[stream].substream;
263                 if (!substream)
264                         continue;
265                 buf = &substream->dma_buffer;
266                 if (!buf->area)
267                         continue;
268                 dma_free_writecombine(pcm->card->dev, buf->bytes,
269                                       buf->area, buf->addr);
270                 buf->area = NULL;
271         }
272 }
273 EXPORT_SYMBOL(pxa2xx_pcm_free_dma_buffers);
274
275 MODULE_AUTHOR("Nicolas Pitre");
276 MODULE_DESCRIPTION("Intel PXA2xx sound library");
277 MODULE_LICENSE("GPL");