1/*
2 * linux/sound/soc/pxa/mmp-pcm.c
3 *
4 * Copyright (C) 2011 Marvell International Ltd.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 */
12#include <linux/module.h>
13#include <linux/init.h>
14#include <linux/platform_device.h>
15#include <linux/slab.h>
16#include <linux/dma-mapping.h>
17#include <linux/dmaengine.h>
18#include <linux/platform_data/dma-mmp_tdma.h>
19#include <linux/platform_data/mmp_audio.h>
20
21#include <sound/pxa2xx-lib.h>
22#include <sound/core.h>
23#include <sound/pcm.h>
24#include <sound/pcm_params.h>
25#include <sound/soc.h>
26#include <sound/dmaengine_pcm.h>
27
28struct mmp_dma_data {
29	int ssp_id;
30	struct resource *dma_res;
31};
32
33#define MMP_PCM_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		SNDRV_PCM_INFO_NO_PERIOD_WAKEUP)
39
40static struct snd_pcm_hardware mmp_pcm_hardware[] = {
41	{
42		.info			= MMP_PCM_INFO,
43		.period_bytes_min	= 1024,
44		.period_bytes_max	= 2048,
45		.periods_min		= 2,
46		.periods_max		= 32,
47		.buffer_bytes_max	= 4096,
48		.fifo_size		= 32,
49	},
50	{
51		.info			= MMP_PCM_INFO,
52		.period_bytes_min	= 1024,
53		.period_bytes_max	= 2048,
54		.periods_min		= 2,
55		.periods_max		= 32,
56		.buffer_bytes_max	= 4096,
57		.fifo_size		= 32,
58	},
59};
60
61static int mmp_pcm_hw_params(struct snd_pcm_substream *substream,
62			      struct snd_pcm_hw_params *params)
63{
64	struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
65	struct dma_slave_config slave_config;
66	int ret;
67
68	ret =
69	    snd_dmaengine_pcm_prepare_slave_config(substream, params,
70						   &slave_config);
71	if (ret)
72		return ret;
73
74	ret = dmaengine_slave_config(chan, &slave_config);
75	if (ret)
76		return ret;
77
78	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
79
80	return 0;
81}
82
83static bool filter(struct dma_chan *chan, void *param)
84{
85	struct mmp_dma_data *dma_data = param;
86	bool found = false;
87	char *devname;
88
89	devname = kasprintf(GFP_KERNEL, "%s.%d", dma_data->dma_res->name,
90		dma_data->ssp_id);
91	if ((strcmp(dev_name(chan->device->dev), devname) == 0) &&
92		(chan->chan_id == dma_data->dma_res->start)) {
93		found = true;
94	}
95
96	kfree(devname);
97	return found;
98}
99
100static int mmp_pcm_open(struct snd_pcm_substream *substream)
101{
102	struct snd_soc_pcm_runtime *rtd = substream->private_data;
103	struct platform_device *pdev = to_platform_device(rtd->platform->dev);
104	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
105	struct mmp_dma_data dma_data;
106	struct resource *r;
107
108	r = platform_get_resource(pdev, IORESOURCE_DMA, substream->stream);
109	if (!r)
110		return -EBUSY;
111
112	snd_soc_set_runtime_hwparams(substream,
113				&mmp_pcm_hardware[substream->stream]);
114
115	dma_data.dma_res = r;
116	dma_data.ssp_id = cpu_dai->id;
117
118	return snd_dmaengine_pcm_open_request_chan(substream, filter,
119		    &dma_data);
120}
121
122static int mmp_pcm_mmap(struct snd_pcm_substream *substream,
123			 struct vm_area_struct *vma)
124{
125	struct snd_pcm_runtime *runtime = substream->runtime;
126	unsigned long off = vma->vm_pgoff;
127
128	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
129	return remap_pfn_range(vma, vma->vm_start,
130		__phys_to_pfn(runtime->dma_addr) + off,
131		vma->vm_end - vma->vm_start, vma->vm_page_prot);
132}
133
134static struct snd_pcm_ops mmp_pcm_ops = {
135	.open		= mmp_pcm_open,
136	.close		= snd_dmaengine_pcm_close_release_chan,
137	.ioctl		= snd_pcm_lib_ioctl,
138	.hw_params	= mmp_pcm_hw_params,
139	.trigger	= snd_dmaengine_pcm_trigger,
140	.pointer	= snd_dmaengine_pcm_pointer,
141	.mmap		= mmp_pcm_mmap,
142};
143
144static void mmp_pcm_free_dma_buffers(struct snd_pcm *pcm)
145{
146	struct snd_pcm_substream *substream;
147	struct snd_dma_buffer *buf;
148	int stream;
149	struct gen_pool *gpool;
150
151	gpool = sram_get_gpool("asram");
152	if (!gpool)
153		return;
154
155	for (stream = 0; stream < 2; stream++) {
156		size_t size = mmp_pcm_hardware[stream].buffer_bytes_max;
157
158		substream = pcm->streams[stream].substream;
159		if (!substream)
160			continue;
161
162		buf = &substream->dma_buffer;
163		if (!buf->area)
164			continue;
165		gen_pool_free(gpool, (unsigned long)buf->area, size);
166		buf->area = NULL;
167	}
168
169	return;
170}
171
172static int mmp_pcm_preallocate_dma_buffer(struct snd_pcm_substream *substream,
173								int stream)
174{
175	struct snd_dma_buffer *buf = &substream->dma_buffer;
176	size_t size = mmp_pcm_hardware[stream].buffer_bytes_max;
177	struct gen_pool *gpool;
178
179	buf->dev.type = SNDRV_DMA_TYPE_DEV;
180	buf->dev.dev = substream->pcm->card->dev;
181	buf->private_data = NULL;
182
183	gpool = sram_get_gpool("asram");
184	if (!gpool)
185		return -ENOMEM;
186
187	buf->area = gen_pool_dma_alloc(gpool, size, &buf->addr);
188	if (!buf->area)
189		return -ENOMEM;
190	buf->bytes = size;
191	return 0;
192}
193
194static int mmp_pcm_new(struct snd_soc_pcm_runtime *rtd)
195{
196	struct snd_pcm_substream *substream;
197	struct snd_pcm *pcm = rtd->pcm;
198	int ret = 0, stream;
199
200	for (stream = 0; stream < 2; stream++) {
201		substream = pcm->streams[stream].substream;
202
203		ret = mmp_pcm_preallocate_dma_buffer(substream,	stream);
204		if (ret)
205			goto err;
206	}
207
208	return 0;
209
210err:
211	mmp_pcm_free_dma_buffers(pcm);
212	return ret;
213}
214
215static struct snd_soc_platform_driver mmp_soc_platform = {
216	.ops		= &mmp_pcm_ops,
217	.pcm_new	= mmp_pcm_new,
218	.pcm_free	= mmp_pcm_free_dma_buffers,
219};
220
221static int mmp_pcm_probe(struct platform_device *pdev)
222{
223	struct mmp_audio_platdata *pdata = pdev->dev.platform_data;
224
225	if (pdata) {
226		mmp_pcm_hardware[SNDRV_PCM_STREAM_PLAYBACK].buffer_bytes_max =
227						pdata->buffer_max_playback;
228		mmp_pcm_hardware[SNDRV_PCM_STREAM_PLAYBACK].period_bytes_max =
229						pdata->period_max_playback;
230		mmp_pcm_hardware[SNDRV_PCM_STREAM_CAPTURE].buffer_bytes_max =
231						pdata->buffer_max_capture;
232		mmp_pcm_hardware[SNDRV_PCM_STREAM_CAPTURE].period_bytes_max =
233						pdata->period_max_capture;
234	}
235	return snd_soc_register_platform(&pdev->dev, &mmp_soc_platform);
236}
237
238static int mmp_pcm_remove(struct platform_device *pdev)
239{
240	snd_soc_unregister_platform(&pdev->dev);
241	return 0;
242}
243
244static struct platform_driver mmp_pcm_driver = {
245	.driver = {
246		.name = "mmp-pcm-audio",
247	},
248
249	.probe = mmp_pcm_probe,
250	.remove = mmp_pcm_remove,
251};
252
253module_platform_driver(mmp_pcm_driver);
254
255MODULE_AUTHOR("Leo Yan <leoy@marvell.com>");
256MODULE_DESCRIPTION("MMP Soc Audio DMA module");
257MODULE_LICENSE("GPL");
258