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
28 struct 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
40 static 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
mmp_pcm_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)61 static 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
filter(struct dma_chan * chan,void * param)83 static 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
mmp_pcm_open(struct snd_pcm_substream * substream)100 static 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
mmp_pcm_mmap(struct snd_pcm_substream * substream,struct vm_area_struct * vma)122 static 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
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,
142 };
143
mmp_pcm_free_dma_buffers(struct snd_pcm * pcm)144 static 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
mmp_pcm_preallocate_dma_buffer(struct snd_pcm_substream * substream,int stream)172 static 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
mmp_pcm_new(struct snd_soc_pcm_runtime * rtd)194 static 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
210 err:
211 mmp_pcm_free_dma_buffers(pcm);
212 return ret;
213 }
214
215 static 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
mmp_pcm_probe(struct platform_device * pdev)221 static 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
mmp_pcm_remove(struct platform_device * pdev)238 static int mmp_pcm_remove(struct platform_device *pdev)
239 {
240 snd_soc_unregister_platform(&pdev->dev);
241 return 0;
242 }
243
244 static struct platform_driver mmp_pcm_driver = {
245 .driver = {
246 .name = "mmp-pcm-audio",
247 .owner = THIS_MODULE,
248 },
249
250 .probe = mmp_pcm_probe,
251 .remove = mmp_pcm_remove,
252 };
253
254 module_platform_driver(mmp_pcm_driver);
255
256 MODULE_AUTHOR("Leo Yan <leoy@marvell.com>");
257 MODULE_DESCRIPTION("MMP Soc Audio DMA module");
258 MODULE_LICENSE("GPL");
259