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authorLiam Girdwood <liam.girdwood@wolfsonmicro.com>2006-10-12 08:26:55 -0400
committerJaroslav Kysela <perex@suse.cz>2007-02-09 03:00:43 -0500
commitf11a96d5cd94202479e603f9dfaff6e92f342135 (patch)
tree67693eaeef5cee6baa078d4e23ace73fab84d0b4 /sound/soc/pxa
parent102fa9060e114a53628a6594034b6ecf624dffc6 (diff)
[ALSA] ASoC pxa2xx DMA support
This patch adds pxa2xx ASoC DMA audio support. It's based on sound/arm/pxa-pcm.c by Nicolas Pitre with the following differences. o Modified driver structure to use ASoC core PCM callbacks and data structures. o Registration with ASoC core. From: Liam Girdwood <liam.girdwood@wolfsonmicro.com> Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Richard Purdie <rpurdie@rpsys.net> Signed-off-by: Liam Girdwood <liam.girdwood@wolfsonmicro.com> Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Jaroslav Kysela <perex@suse.cz>
Diffstat (limited to 'sound/soc/pxa')
-rw-r--r--sound/soc/pxa/pxa2xx-pcm.c363
-rw-r--r--sound/soc/pxa/pxa2xx-pcm.h48
2 files changed, 411 insertions, 0 deletions
diff --git a/sound/soc/pxa/pxa2xx-pcm.c b/sound/soc/pxa/pxa2xx-pcm.c
new file mode 100644
index 000000000000..ff32f892287e
--- /dev/null
+++ b/sound/soc/pxa/pxa2xx-pcm.c
@@ -0,0 +1,363 @@
1/*
2 * linux/sound/arm/pxa2xx-pcm.c -- ALSA PCM interface for the Intel PXA2xx chip
3 *
4 * Author: Nicolas Pitre
5 * Created: Nov 30, 2004
6 * Copyright: (C) 2004 MontaVista Software, Inc.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13#include <linux/module.h>
14#include <linux/init.h>
15#include <linux/platform_device.h>
16#include <linux/slab.h>
17#include <linux/dma-mapping.h>
18
19#include <sound/driver.h>
20#include <sound/core.h>
21#include <sound/pcm.h>
22#include <sound/pcm_params.h>
23#include <sound/soc.h>
24
25#include <asm/dma.h>
26#include <asm/hardware.h>
27#include <asm/arch/pxa-regs.h>
28#include <asm/arch/audio.h>
29
30#include "pxa2xx-pcm.h"
31
32static const struct snd_pcm_hardware pxa2xx_pcm_hardware = {
33 .info = SNDRV_PCM_INFO_MMAP |
34 SNDRV_PCM_INFO_MMAP_VALID |
35 SNDRV_PCM_INFO_INTERLEAVED |
36 SNDRV_PCM_INFO_PAUSE |
37 SNDRV_PCM_INFO_RESUME,
38 .formats = SNDRV_PCM_FMTBIT_S16_LE |
39 SNDRV_PCM_FMTBIT_S24_LE |
40 SNDRV_PCM_FMTBIT_S32_LE,
41 .period_bytes_min = 32,
42 .period_bytes_max = 8192 - 32,
43 .periods_min = 1,
44 .periods_max = PAGE_SIZE/sizeof(pxa_dma_desc),
45 .buffer_bytes_max = 128 * 1024,
46 .fifo_size = 32,
47};
48
49struct pxa2xx_runtime_data {
50 int dma_ch;
51 struct pxa2xx_pcm_dma_params *params;
52 pxa_dma_desc *dma_desc_array;
53 dma_addr_t dma_desc_array_phys;
54};
55
56static void pxa2xx_pcm_dma_irq(int dma_ch, void *dev_id)
57{
58 struct snd_pcm_substream *substream = dev_id;
59 struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
60 int dcsr;
61
62 dcsr = DCSR(dma_ch);
63 DCSR(dma_ch) = dcsr & ~DCSR_STOPIRQEN;
64
65 if (dcsr & DCSR_ENDINTR) {
66 snd_pcm_period_elapsed(substream);
67 } else {
68 printk( KERN_ERR "%s: DMA error on channel %d (DCSR=%#x)\n",
69 prtd->params->name, dma_ch, dcsr );
70 }
71}
72
73static int pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream,
74 struct snd_pcm_hw_params *params)
75{
76 struct snd_pcm_runtime *runtime = substream->runtime;
77 struct pxa2xx_runtime_data *prtd = runtime->private_data;
78 struct snd_soc_pcm_runtime *rtd = substream->private_data;
79 struct pxa2xx_pcm_dma_params *dma = rtd->cpu_dai->dma_data;
80 size_t totsize = params_buffer_bytes(params);
81 size_t period = params_period_bytes(params);
82 pxa_dma_desc *dma_desc;
83 dma_addr_t dma_buff_phys, next_desc_phys;
84 int ret;
85
86 /* this may get called several times by oss emulation
87 * with different params */
88 if (prtd->params == NULL) {
89 prtd->params = dma;
90 ret = pxa_request_dma(prtd->params->name, DMA_PRIO_LOW,
91 pxa2xx_pcm_dma_irq, substream);
92 if (ret < 0)
93 return ret;
94 prtd->dma_ch = ret;
95 } else if (prtd->params != dma) {
96 pxa_free_dma(prtd->dma_ch);
97 prtd->params = dma;
98 ret = pxa_request_dma(prtd->params->name, DMA_PRIO_LOW,
99 pxa2xx_pcm_dma_irq, substream);
100 if (ret < 0)
101 return ret;
102 prtd->dma_ch = ret;
103 }
104
105 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
106 runtime->dma_bytes = totsize;
107
108 dma_desc = prtd->dma_desc_array;
109 next_desc_phys = prtd->dma_desc_array_phys;
110 dma_buff_phys = runtime->dma_addr;
111 do {
112 next_desc_phys += sizeof(pxa_dma_desc);
113 dma_desc->ddadr = next_desc_phys;
114 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
115 dma_desc->dsadr = dma_buff_phys;
116 dma_desc->dtadr = prtd->params->dev_addr;
117 } else {
118 dma_desc->dsadr = prtd->params->dev_addr;
119 dma_desc->dtadr = dma_buff_phys;
120 }
121 if (period > totsize)
122 period = totsize;
123 dma_desc->dcmd = prtd->params->dcmd | period | DCMD_ENDIRQEN;
124 dma_desc++;
125 dma_buff_phys += period;
126 } while (totsize -= period);
127 dma_desc[-1].ddadr = prtd->dma_desc_array_phys;
128
129 return 0;
130}
131
132static int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
133{
134 struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
135
136 if (prtd && prtd->params)
137 *prtd->params->drcmr = 0;
138
139 if (prtd->dma_ch) {
140 snd_pcm_set_runtime_buffer(substream, NULL);
141 pxa_free_dma(prtd->dma_ch);
142 prtd->dma_ch = 0;
143 }
144
145 return 0;
146}
147
148static int pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
149{
150 struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
151
152 DCSR(prtd->dma_ch) &= ~DCSR_RUN;
153 DCSR(prtd->dma_ch) = 0;
154 DCMD(prtd->dma_ch) = 0;
155 *prtd->params->drcmr = prtd->dma_ch | DRCMR_MAPVLD;
156
157 return 0;
158}
159
160static int pxa2xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
161{
162 struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
163 int ret = 0;
164
165 switch (cmd) {
166 case SNDRV_PCM_TRIGGER_START:
167 DDADR(prtd->dma_ch) = prtd->dma_desc_array_phys;
168 DCSR(prtd->dma_ch) = DCSR_RUN;
169 break;
170
171 case SNDRV_PCM_TRIGGER_STOP:
172 case SNDRV_PCM_TRIGGER_SUSPEND:
173 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
174 DCSR(prtd->dma_ch) &= ~DCSR_RUN;
175 break;
176
177 case SNDRV_PCM_TRIGGER_RESUME:
178 DCSR(prtd->dma_ch) |= DCSR_RUN;
179 break;
180 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
181 DDADR(prtd->dma_ch) = prtd->dma_desc_array_phys;
182 DCSR(prtd->dma_ch) |= DCSR_RUN;
183 break;
184
185 default:
186 ret = -EINVAL;
187 }
188
189 return ret;
190}
191
192static snd_pcm_uframes_t
193pxa2xx_pcm_pointer(struct snd_pcm_substream *substream)
194{
195 struct snd_pcm_runtime *runtime = substream->runtime;
196 struct pxa2xx_runtime_data *prtd = runtime->private_data;
197
198 dma_addr_t ptr = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
199 DSADR(prtd->dma_ch) : DTADR(prtd->dma_ch);
200 snd_pcm_uframes_t x = bytes_to_frames(runtime, ptr - runtime->dma_addr);
201
202 if (x == runtime->buffer_size)
203 x = 0;
204 return x;
205}
206
207static int pxa2xx_pcm_open(struct snd_pcm_substream *substream)
208{
209 struct snd_pcm_runtime *runtime = substream->runtime;
210 struct pxa2xx_runtime_data *prtd;
211 int ret;
212
213 snd_soc_set_runtime_hwparams(substream, &pxa2xx_pcm_hardware);
214
215 /*
216 * For mysterious reasons (and despite what the manual says)
217 * playback samples are lost if the DMA count is not a multiple
218 * of the DMA burst size. Let's add a rule to enforce that.
219 */
220 ret = snd_pcm_hw_constraint_step(runtime, 0,
221 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);
222 if (ret)
223 goto out;
224
225 ret = snd_pcm_hw_constraint_step(runtime, 0,
226 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32);
227 if (ret)
228 goto out;
229
230 prtd = kzalloc(sizeof(struct pxa2xx_runtime_data), GFP_KERNEL);
231 if (prtd == NULL) {
232 ret = -ENOMEM;
233 goto out;
234 }
235
236 prtd->dma_desc_array =
237 dma_alloc_writecombine(substream->pcm->card->dev, PAGE_SIZE,
238 &prtd->dma_desc_array_phys, GFP_KERNEL);
239 if (!prtd->dma_desc_array) {
240 ret = -ENOMEM;
241 goto err1;
242 }
243
244 runtime->private_data = prtd;
245 return 0;
246
247 err1:
248 kfree(prtd);
249 out:
250 return ret;
251}
252
253static int pxa2xx_pcm_close(struct snd_pcm_substream *substream)
254{
255 struct snd_pcm_runtime *runtime = substream->runtime;
256 struct pxa2xx_runtime_data *prtd = runtime->private_data;
257
258 dma_free_writecombine(substream->pcm->card->dev, PAGE_SIZE,
259 prtd->dma_desc_array, prtd->dma_desc_array_phys);
260 kfree(prtd);
261 return 0;
262}
263
264static int pxa2xx_pcm_mmap(struct snd_pcm_substream *substream,
265 struct vm_area_struct *vma)
266{
267 struct snd_pcm_runtime *runtime = substream->runtime;
268 return dma_mmap_writecombine(substream->pcm->card->dev, vma,
269 runtime->dma_area,
270 runtime->dma_addr,
271 runtime->dma_bytes);
272}
273
274struct snd_pcm_ops pxa2xx_pcm_ops = {
275 .open = pxa2xx_pcm_open,
276 .close = pxa2xx_pcm_close,
277 .ioctl = snd_pcm_lib_ioctl,
278 .hw_params = pxa2xx_pcm_hw_params,
279 .hw_free = pxa2xx_pcm_hw_free,
280 .prepare = pxa2xx_pcm_prepare,
281 .trigger = pxa2xx_pcm_trigger,
282 .pointer = pxa2xx_pcm_pointer,
283 .mmap = pxa2xx_pcm_mmap,
284};
285
286static int pxa2xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
287{
288 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
289 struct snd_dma_buffer *buf = &substream->dma_buffer;
290 size_t size = pxa2xx_pcm_hardware.buffer_bytes_max;
291 buf->dev.type = SNDRV_DMA_TYPE_DEV;
292 buf->dev.dev = pcm->card->dev;
293 buf->private_data = NULL;
294 buf->area = dma_alloc_writecombine(pcm->card->dev, size,
295 &buf->addr, GFP_KERNEL);
296 if (!buf->area)
297 return -ENOMEM;
298 buf->bytes = size;
299 return 0;
300}
301
302static void pxa2xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
303{
304 struct snd_pcm_substream *substream;
305 struct snd_dma_buffer *buf;
306 int stream;
307
308 for (stream = 0; stream < 2; stream++) {
309 substream = pcm->streams[stream].substream;
310 if (!substream)
311 continue;
312
313 buf = &substream->dma_buffer;
314 if (!buf->area)
315 continue;
316
317 dma_free_writecombine(pcm->card->dev, buf->bytes,
318 buf->area, buf->addr);
319 buf->area = NULL;
320 }
321}
322
323static u64 pxa2xx_pcm_dmamask = DMA_32BIT_MASK;
324
325int pxa2xx_pcm_new(struct snd_card *card, struct snd_soc_codec_dai *dai,
326 struct snd_pcm *pcm)
327{
328 int ret = 0;
329
330 if (!card->dev->dma_mask)
331 card->dev->dma_mask = &pxa2xx_pcm_dmamask;
332 if (!card->dev->coherent_dma_mask)
333 card->dev->coherent_dma_mask = DMA_32BIT_MASK;
334
335 if (dai->playback.channels_min) {
336 ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
337 SNDRV_PCM_STREAM_PLAYBACK);
338 if (ret)
339 goto out;
340 }
341
342 if (dai->capture.channels_min) {
343 ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
344 SNDRV_PCM_STREAM_CAPTURE);
345 if (ret)
346 goto out;
347 }
348 out:
349 return ret;
350}
351
352struct snd_soc_platform pxa2xx_soc_platform = {
353 .name = "pxa2xx-audio",
354 .pcm_ops = &pxa2xx_pcm_ops,
355 .pcm_new = pxa2xx_pcm_new,
356 .pcm_free = pxa2xx_pcm_free_dma_buffers,
357};
358
359EXPORT_SYMBOL_GPL(pxa2xx_soc_platform);
360
361MODULE_AUTHOR("Nicolas Pitre");
362MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module");
363MODULE_LICENSE("GPL");
diff --git a/sound/soc/pxa/pxa2xx-pcm.h b/sound/soc/pxa/pxa2xx-pcm.h
new file mode 100644
index 000000000000..0b55f070da27
--- /dev/null
+++ b/sound/soc/pxa/pxa2xx-pcm.h
@@ -0,0 +1,48 @@
1/*
2 * linux/sound/arm/pxa2xx-pcm.h -- ALSA PCM interface for the Intel PXA2xx chip
3 *
4 * Author: Nicolas Pitre
5 * Created: Nov 30, 2004
6 * Copyright: MontaVista Software, Inc.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13#ifndef _PXA2XX_PCM_H
14#define _PXA2XX_PCM_H
15
16struct pxa2xx_pcm_dma_params {
17 char *name; /* stream identifier */
18 u32 dcmd; /* DMA descriptor dcmd field */
19 volatile u32 *drcmr; /* the DMA request channel to use */
20 u32 dev_addr; /* device physical address for DMA */
21};
22
23struct pxa2xx_gpio {
24 u32 sys;
25 u32 rx;
26 u32 tx;
27 u32 clk;
28 u32 frm;
29};
30
31/* pxa2xx DAI ID's */
32#define PXA2XX_DAI_AC97_HIFI 0
33#define PXA2XX_DAI_AC97_AUX 1
34#define PXA2XX_DAI_AC97_MIC 2
35#define PXA2XX_DAI_I2S 0
36#define PXA2XX_DAI_SSP1 0
37#define PXA2XX_DAI_SSP2 1
38#define PXA2XX_DAI_SSP3 2
39
40extern struct snd_soc_cpu_dai pxa_ac97_dai[3];
41extern struct snd_soc_cpu_dai pxa_i2s_dai;
42extern struct snd_soc_cpu_dai pxa_ssp_dai[3];
43
44/* platform data */
45extern struct snd_soc_platform pxa2xx_soc_platform;
46extern struct snd_ac97_bus_ops pxa2xx_ac97_ops;
47
48#endif
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-19 13:58:25 -0500