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Merge tag 'platform-drivers-x86-v3.19-1' of git://git.infradead.org/users/dvhart...
[mirror_ubuntu-artful-kernel.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/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
22 static 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
39 int __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 /* temporary transition hack */
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 /* can't happen */
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 }
104 EXPORT_SYMBOL(__pxa2xx_pcm_hw_params);
105
106 int __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 }
118 EXPORT_SYMBOL(__pxa2xx_pcm_hw_free);
119
120 int 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 }
151 EXPORT_SYMBOL(pxa2xx_pcm_trigger);
152
153 snd_pcm_uframes_t
154 pxa2xx_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 }
167 EXPORT_SYMBOL(pxa2xx_pcm_pointer);
168
169 int __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 }
188 EXPORT_SYMBOL(__pxa2xx_pcm_prepare);
189
190 void 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_stop_xrun(substream);
204 }
205 }
206 EXPORT_SYMBOL(pxa2xx_pcm_dma_irq);
207
208 int __pxa2xx_pcm_open(struct snd_pcm_substream *substream)
209 {
210 struct snd_pcm_runtime *runtime = substream->runtime;
211 struct pxa2xx_runtime_data *rtd;
212 int ret;
213
214 runtime->hw = pxa2xx_pcm_hardware;
215
216 /*
217 * For mysterious reasons (and despite what the manual says)
218 * playback samples are lost if the DMA count is not a multiple
219 * of the DMA burst size. Let's add a rule to enforce that.
220 */
221 ret = snd_pcm_hw_constraint_step(runtime, 0,
222 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);
223 if (ret)
224 goto out;
225
226 ret = snd_pcm_hw_constraint_step(runtime, 0,
227 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32);
228 if (ret)
229 goto out;
230
231 ret = snd_pcm_hw_constraint_integer(runtime,
232 SNDRV_PCM_HW_PARAM_PERIODS);
233 if (ret < 0)
234 goto out;
235
236 ret = -ENOMEM;
237 rtd = kzalloc(sizeof(*rtd), GFP_KERNEL);
238 if (!rtd)
239 goto out;
240 rtd->dma_desc_array =
241 dma_alloc_writecombine(substream->pcm->card->dev, PAGE_SIZE,
242 &rtd->dma_desc_array_phys, GFP_KERNEL);
243 if (!rtd->dma_desc_array)
244 goto err1;
245
246 rtd->dma_ch = -1;
247 runtime->private_data = rtd;
248 return 0;
249
250 err1:
251 kfree(rtd);
252 out:
253 return ret;
254 }
255 EXPORT_SYMBOL(__pxa2xx_pcm_open);
256
257 int __pxa2xx_pcm_close(struct snd_pcm_substream *substream)
258 {
259 struct snd_pcm_runtime *runtime = substream->runtime;
260 struct pxa2xx_runtime_data *rtd = runtime->private_data;
261
262 dma_free_writecombine(substream->pcm->card->dev, PAGE_SIZE,
263 rtd->dma_desc_array, rtd->dma_desc_array_phys);
264 kfree(rtd);
265 return 0;
266 }
267 EXPORT_SYMBOL(__pxa2xx_pcm_close);
268
269 int pxa2xx_pcm_mmap(struct snd_pcm_substream *substream,
270 struct vm_area_struct *vma)
271 {
272 struct snd_pcm_runtime *runtime = substream->runtime;
273 return dma_mmap_writecombine(substream->pcm->card->dev, vma,
274 runtime->dma_area,
275 runtime->dma_addr,
276 runtime->dma_bytes);
277 }
278 EXPORT_SYMBOL(pxa2xx_pcm_mmap);
279
280 int pxa2xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
281 {
282 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
283 struct snd_dma_buffer *buf = &substream->dma_buffer;
284 size_t size = pxa2xx_pcm_hardware.buffer_bytes_max;
285 buf->dev.type = SNDRV_DMA_TYPE_DEV;
286 buf->dev.dev = pcm->card->dev;
287 buf->private_data = NULL;
288 buf->area = dma_alloc_writecombine(pcm->card->dev, size,
289 &buf->addr, GFP_KERNEL);
290 if (!buf->area)
291 return -ENOMEM;
292 buf->bytes = size;
293 return 0;
294 }
295 EXPORT_SYMBOL(pxa2xx_pcm_preallocate_dma_buffer);
296
297 void pxa2xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
298 {
299 struct snd_pcm_substream *substream;
300 struct snd_dma_buffer *buf;
301 int stream;
302
303 for (stream = 0; stream < 2; stream++) {
304 substream = pcm->streams[stream].substream;
305 if (!substream)
306 continue;
307 buf = &substream->dma_buffer;
308 if (!buf->area)
309 continue;
310 dma_free_writecombine(pcm->card->dev, buf->bytes,
311 buf->area, buf->addr);
312 buf->area = NULL;
313 }
314 }
315 EXPORT_SYMBOL(pxa2xx_pcm_free_dma_buffers);
316
317 MODULE_AUTHOR("Nicolas Pitre");
318 MODULE_DESCRIPTION("Intel PXA2xx sound library");
319 MODULE_LICENSE("GPL");