2 * linux/sound/soc/pxa/mmp-pcm.c
4 * Copyright (C) 2011 Marvell International Ltd.
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.
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>
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>
30 struct resource *dma_res;
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)
40 static struct snd_pcm_hardware mmp_pcm_hardware[] = {
43 .period_bytes_min = 1024,
44 .period_bytes_max = 2048,
47 .buffer_bytes_max = 4096,
52 .period_bytes_min = 1024,
53 .period_bytes_max = 2048,
56 .buffer_bytes_max = 4096,
61 static int mmp_pcm_hw_params(struct snd_pcm_substream *substream,
62 struct snd_pcm_hw_params *params)
64 struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
65 struct dma_slave_config slave_config;
69 snd_dmaengine_pcm_prepare_slave_config(substream, params,
74 ret = dmaengine_slave_config(chan, &slave_config);
78 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
83 static bool filter(struct dma_chan *chan, void *param)
85 struct mmp_dma_data *dma_data = param;
89 devname = kasprintf(GFP_KERNEL, "%s.%d", dma_data->dma_res->name,
91 if ((strcmp(dev_name(chan->device->dev), devname) == 0) &&
92 (chan->chan_id == dma_data->dma_res->start)) {
100 static int mmp_pcm_open(struct snd_pcm_substream *substream)
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;
108 r = platform_get_resource(pdev, IORESOURCE_DMA, substream->stream);
112 snd_soc_set_runtime_hwparams(substream,
113 &mmp_pcm_hardware[substream->stream]);
115 dma_data.dma_res = r;
116 dma_data.ssp_id = cpu_dai->id;
118 return snd_dmaengine_pcm_open_request_chan(substream, filter,
122 static int mmp_pcm_mmap(struct snd_pcm_substream *substream,
123 struct vm_area_struct *vma)
125 struct snd_pcm_runtime *runtime = substream->runtime;
126 unsigned long off = vma->vm_pgoff;
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);
134 static 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,
144 static void mmp_pcm_free_dma_buffers(struct snd_pcm *pcm)
146 struct snd_pcm_substream *substream;
147 struct snd_dma_buffer *buf;
149 struct gen_pool *gpool;
151 gpool = sram_get_gpool("asram");
155 for (stream = 0; stream < 2; stream++) {
156 size_t size = mmp_pcm_hardware[stream].buffer_bytes_max;
158 substream = pcm->streams[stream].substream;
162 buf = &substream->dma_buffer;
165 gen_pool_free(gpool, (unsigned long)buf->area, size);
172 static int mmp_pcm_preallocate_dma_buffer(struct snd_pcm_substream *substream,
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;
179 buf->dev.type = SNDRV_DMA_TYPE_DEV;
180 buf->dev.dev = substream->pcm->card->dev;
181 buf->private_data = NULL;
183 gpool = sram_get_gpool("asram");
187 buf->area = gen_pool_dma_alloc(gpool, size, &buf->addr);
194 static int mmp_pcm_new(struct snd_soc_pcm_runtime *rtd)
196 struct snd_pcm_substream *substream;
197 struct snd_pcm *pcm = rtd->pcm;
200 for (stream = 0; stream < 2; stream++) {
201 substream = pcm->streams[stream].substream;
203 ret = mmp_pcm_preallocate_dma_buffer(substream, stream);
211 mmp_pcm_free_dma_buffers(pcm);
215 static struct snd_soc_platform_driver mmp_soc_platform = {
217 .pcm_new = mmp_pcm_new,
218 .pcm_free = mmp_pcm_free_dma_buffers,
221 static int mmp_pcm_probe(struct platform_device *pdev)
223 struct mmp_audio_platdata *pdata = pdev->dev.platform_data;
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;
235 return devm_snd_soc_register_platform(&pdev->dev, &mmp_soc_platform);
238 static struct platform_driver mmp_pcm_driver = {
240 .name = "mmp-pcm-audio",
243 .probe = mmp_pcm_probe,
246 module_platform_driver(mmp_pcm_driver);
248 MODULE_AUTHOR("Leo Yan <leoy@marvell.com>");
249 MODULE_DESCRIPTION("MMP Soc Audio DMA module");
250 MODULE_LICENSE("GPL");