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-rw-r--r--sound/arm/pxa2xx-pcm-lib.c278
1 files changed, 278 insertions, 0 deletions
diff --git a/sound/arm/pxa2xx-pcm-lib.c b/sound/arm/pxa2xx-pcm-lib.c
new file mode 100644
index 000000000000..1c93eb77cb99
--- /dev/null
+++ b/sound/arm/pxa2xx-pcm-lib.c
@@ -0,0 +1,278 @@
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
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)
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 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}
147EXPORT_SYMBOL(__pxa2xx_pcm_prepare);
148
149void 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}
166EXPORT_SYMBOL(pxa2xx_pcm_dma_irq);
167
168int __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}
214EXPORT_SYMBOL(__pxa2xx_pcm_open);
215
216int __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}
226EXPORT_SYMBOL(__pxa2xx_pcm_close);
227
228int 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}
237EXPORT_SYMBOL(pxa2xx_pcm_mmap);
238
239int 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}
254EXPORT_SYMBOL(pxa2xx_pcm_preallocate_dma_buffer);
255
256void 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}
274EXPORT_SYMBOL(pxa2xx_pcm_free_dma_buffers);
275
276MODULE_AUTHOR("Nicolas Pitre");
277MODULE_DESCRIPTION("Intel PXA2xx sound library");
278MODULE_LICENSE("GPL");
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-28 12:42:35 -0500