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#include <linux/dma/pxa-dma.h>
12
13#include <sound/core.h>
14#include <sound/pcm.h>
15#include <sound/pcm_params.h>
16#include <sound/pxa2xx-lib.h>
17#include <sound/dmaengine_pcm.h>
18
19#include "pxa2xx-pcm.h"
20
21static const struct snd_pcm_hardware pxa2xx_pcm_hardware = {
22	.info			= SNDRV_PCM_INFO_MMAP |
23				  SNDRV_PCM_INFO_MMAP_VALID |
24				  SNDRV_PCM_INFO_INTERLEAVED |
25				  SNDRV_PCM_INFO_PAUSE |
26				  SNDRV_PCM_INFO_RESUME,
27	.formats		= SNDRV_PCM_FMTBIT_S16_LE |
28					SNDRV_PCM_FMTBIT_S24_LE |
29					SNDRV_PCM_FMTBIT_S32_LE,
30	.period_bytes_min	= 32,
31	.period_bytes_max	= 8192 - 32,
32	.periods_min		= 1,
33	.periods_max		= 256,
34	.buffer_bytes_max	= 128 * 1024,
35	.fifo_size		= 32,
36};
37
38int __pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream,
39				struct snd_pcm_hw_params *params)
40{
41	struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
42	struct snd_soc_pcm_runtime *rtd = substream->private_data;
43	struct snd_dmaengine_dai_dma_data *dma_params;
44	struct dma_slave_config config;
45	int ret;
46
47	dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
48	if (!dma_params)
49		return 0;
50
51	ret = snd_hwparams_to_dma_slave_config(substream, params, &config);
52	if (ret)
53		return ret;
54
55	snd_dmaengine_pcm_set_config_from_dai_data(substream,
56			snd_soc_dai_get_dma_data(rtd->cpu_dai, substream),
57			&config);
58
59	ret = dmaengine_slave_config(chan, &config);
60	if (ret)
61		return ret;
62
63	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
64
65	return 0;
66}
67EXPORT_SYMBOL(__pxa2xx_pcm_hw_params);
68
69int __pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
70{
71	snd_pcm_set_runtime_buffer(substream, NULL);
72	return 0;
73}
74EXPORT_SYMBOL(__pxa2xx_pcm_hw_free);
75
76int pxa2xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
77{
78	return snd_dmaengine_pcm_trigger(substream, cmd);
79}
80EXPORT_SYMBOL(pxa2xx_pcm_trigger);
81
82snd_pcm_uframes_t
83pxa2xx_pcm_pointer(struct snd_pcm_substream *substream)
84{
85	return snd_dmaengine_pcm_pointer(substream);
86}
87EXPORT_SYMBOL(pxa2xx_pcm_pointer);
88
89int __pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
90{
91	return 0;
92}
93EXPORT_SYMBOL(__pxa2xx_pcm_prepare);
94
95int __pxa2xx_pcm_open(struct snd_pcm_substream *substream)
96{
97	struct snd_soc_pcm_runtime *rtd = substream->private_data;
98	struct snd_pcm_runtime *runtime = substream->runtime;
99	struct snd_dmaengine_dai_dma_data *dma_params;
100	int ret;
101
102	runtime->hw = pxa2xx_pcm_hardware;
103
104	dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
105	if (!dma_params)
106		return 0;
107
108	/*
109	 * For mysterious reasons (and despite what the manual says)
110	 * playback samples are lost if the DMA count is not a multiple
111	 * of the DMA burst size.  Let's add a rule to enforce that.
112	 */
113	ret = snd_pcm_hw_constraint_step(runtime, 0,
114		SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);
115	if (ret)
116		return ret;
117
118	ret = snd_pcm_hw_constraint_step(runtime, 0,
119		SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32);
120	if (ret)
121		return ret;
122
123	ret = snd_pcm_hw_constraint_integer(runtime,
124					    SNDRV_PCM_HW_PARAM_PERIODS);
125	if (ret < 0)
126		return ret;
127
128	return snd_dmaengine_pcm_open_request_chan(substream,
129					pxad_filter_fn,
130					dma_params->filter_data);
131}
132EXPORT_SYMBOL(__pxa2xx_pcm_open);
133
134int __pxa2xx_pcm_close(struct snd_pcm_substream *substream)
135{
136	return snd_dmaengine_pcm_close_release_chan(substream);
137}
138EXPORT_SYMBOL(__pxa2xx_pcm_close);
139
140int pxa2xx_pcm_mmap(struct snd_pcm_substream *substream,
141	struct vm_area_struct *vma)
142{
143	struct snd_pcm_runtime *runtime = substream->runtime;
144	return dma_mmap_writecombine(substream->pcm->card->dev, vma,
145				     runtime->dma_area,
146				     runtime->dma_addr,
147				     runtime->dma_bytes);
148}
149EXPORT_SYMBOL(pxa2xx_pcm_mmap);
150
151int pxa2xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
152{
153	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
154	struct snd_dma_buffer *buf = &substream->dma_buffer;
155	size_t size = pxa2xx_pcm_hardware.buffer_bytes_max;
156	buf->dev.type = SNDRV_DMA_TYPE_DEV;
157	buf->dev.dev = pcm->card->dev;
158	buf->private_data = NULL;
159	buf->area = dma_alloc_writecombine(pcm->card->dev, size,
160					   &buf->addr, GFP_KERNEL);
161	if (!buf->area)
162		return -ENOMEM;
163	buf->bytes = size;
164	return 0;
165}
166EXPORT_SYMBOL(pxa2xx_pcm_preallocate_dma_buffer);
167
168void pxa2xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
169{
170	struct snd_pcm_substream *substream;
171	struct snd_dma_buffer *buf;
172	int stream;
173
174	for (stream = 0; stream < 2; stream++) {
175		substream = pcm->streams[stream].substream;
176		if (!substream)
177			continue;
178		buf = &substream->dma_buffer;
179		if (!buf->area)
180			continue;
181		dma_free_writecombine(pcm->card->dev, buf->bytes,
182				      buf->area, buf->addr);
183		buf->area = NULL;
184	}
185}
186EXPORT_SYMBOL(pxa2xx_pcm_free_dma_buffers);
187
188MODULE_AUTHOR("Nicolas Pitre");
189MODULE_DESCRIPTION("Intel PXA2xx sound library");
190MODULE_LICENSE("GPL");
191