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 #define DRV_NAME "mmp-pcm"
29
30 struct mmp_dma_data {
31 int ssp_id;
32 struct resource *dma_res;
33 };
34
35 #define MMP_PCM_INFO (SNDRV_PCM_INFO_MMAP | \
36 SNDRV_PCM_INFO_MMAP_VALID | \
37 SNDRV_PCM_INFO_INTERLEAVED | \
38 SNDRV_PCM_INFO_PAUSE | \
39 SNDRV_PCM_INFO_RESUME | \
40 SNDRV_PCM_INFO_NO_PERIOD_WAKEUP)
41
42 static struct snd_pcm_hardware mmp_pcm_hardware[] = {
43 {
44 .info = MMP_PCM_INFO,
45 .period_bytes_min = 1024,
46 .period_bytes_max = 2048,
47 .periods_min = 2,
48 .periods_max = 32,
49 .buffer_bytes_max = 4096,
50 .fifo_size = 32,
51 },
52 {
53 .info = MMP_PCM_INFO,
54 .period_bytes_min = 1024,
55 .period_bytes_max = 2048,
56 .periods_min = 2,
57 .periods_max = 32,
58 .buffer_bytes_max = 4096,
59 .fifo_size = 32,
60 },
61 };
62
mmp_pcm_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)63 static int mmp_pcm_hw_params(struct snd_pcm_substream *substream,
64 struct snd_pcm_hw_params *params)
65 {
66 struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
67 struct dma_slave_config slave_config;
68 int ret;
69
70 ret =
71 snd_dmaengine_pcm_prepare_slave_config(substream, params,
72 &slave_config);
73 if (ret)
74 return ret;
75
76 ret = dmaengine_slave_config(chan, &slave_config);
77 if (ret)
78 return ret;
79
80 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
81
82 return 0;
83 }
84
filter(struct dma_chan * chan,void * param)85 static bool filter(struct dma_chan *chan, void *param)
86 {
87 struct mmp_dma_data *dma_data = param;
88 bool found = false;
89 char *devname;
90
91 devname = kasprintf(GFP_KERNEL, "%s.%d", dma_data->dma_res->name,
92 dma_data->ssp_id);
93 if ((strcmp(dev_name(chan->device->dev), devname) == 0) &&
94 (chan->chan_id == dma_data->dma_res->start)) {
95 found = true;
96 }
97
98 kfree(devname);
99 return found;
100 }
101
mmp_pcm_open(struct snd_pcm_substream * substream)102 static int mmp_pcm_open(struct snd_pcm_substream *substream)
103 {
104 struct snd_soc_pcm_runtime *rtd = substream->private_data;
105 struct snd_soc_component *component = snd_soc_rtdcom_lookup(rtd, DRV_NAME);
106 struct platform_device *pdev = to_platform_device(component->dev);
107 struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
108 struct mmp_dma_data dma_data;
109 struct resource *r;
110
111 r = platform_get_resource(pdev, IORESOURCE_DMA, substream->stream);
112 if (!r)
113 return -EBUSY;
114
115 snd_soc_set_runtime_hwparams(substream,
116 &mmp_pcm_hardware[substream->stream]);
117
118 dma_data.dma_res = r;
119 dma_data.ssp_id = cpu_dai->id;
120
121 return snd_dmaengine_pcm_open_request_chan(substream, filter,
122 &dma_data);
123 }
124
mmp_pcm_mmap(struct snd_pcm_substream * substream,struct vm_area_struct * vma)125 static int mmp_pcm_mmap(struct snd_pcm_substream *substream,
126 struct vm_area_struct *vma)
127 {
128 struct snd_pcm_runtime *runtime = substream->runtime;
129 unsigned long off = vma->vm_pgoff;
130
131 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
132 return remap_pfn_range(vma, vma->vm_start,
133 __phys_to_pfn(runtime->dma_addr) + off,
134 vma->vm_end - vma->vm_start, vma->vm_page_prot);
135 }
136
137 static const struct snd_pcm_ops mmp_pcm_ops = {
138 .open = mmp_pcm_open,
139 .close = snd_dmaengine_pcm_close_release_chan,
140 .ioctl = snd_pcm_lib_ioctl,
141 .hw_params = mmp_pcm_hw_params,
142 .trigger = snd_dmaengine_pcm_trigger,
143 .pointer = snd_dmaengine_pcm_pointer,
144 .mmap = mmp_pcm_mmap,
145 };
146
mmp_pcm_free_dma_buffers(struct snd_pcm * pcm)147 static void mmp_pcm_free_dma_buffers(struct snd_pcm *pcm)
148 {
149 struct snd_pcm_substream *substream;
150 struct snd_dma_buffer *buf;
151 int stream;
152 struct gen_pool *gpool;
153
154 gpool = sram_get_gpool("asram");
155 if (!gpool)
156 return;
157
158 for (stream = 0; stream < 2; stream++) {
159 size_t size = mmp_pcm_hardware[stream].buffer_bytes_max;
160
161 substream = pcm->streams[stream].substream;
162 if (!substream)
163 continue;
164
165 buf = &substream->dma_buffer;
166 if (!buf->area)
167 continue;
168 gen_pool_free(gpool, (unsigned long)buf->area, size);
169 buf->area = NULL;
170 }
171
172 }
173
mmp_pcm_preallocate_dma_buffer(struct snd_pcm_substream * substream,int stream)174 static int mmp_pcm_preallocate_dma_buffer(struct snd_pcm_substream *substream,
175 int stream)
176 {
177 struct snd_dma_buffer *buf = &substream->dma_buffer;
178 size_t size = mmp_pcm_hardware[stream].buffer_bytes_max;
179 struct gen_pool *gpool;
180
181 buf->dev.type = SNDRV_DMA_TYPE_DEV;
182 buf->dev.dev = substream->pcm->card->dev;
183 buf->private_data = NULL;
184
185 gpool = sram_get_gpool("asram");
186 if (!gpool)
187 return -ENOMEM;
188
189 buf->area = gen_pool_dma_alloc(gpool, size, &buf->addr);
190 if (!buf->area)
191 return -ENOMEM;
192 buf->bytes = size;
193 return 0;
194 }
195
mmp_pcm_new(struct snd_soc_pcm_runtime * rtd)196 static int mmp_pcm_new(struct snd_soc_pcm_runtime *rtd)
197 {
198 struct snd_pcm_substream *substream;
199 struct snd_pcm *pcm = rtd->pcm;
200 int ret = 0, stream;
201
202 for (stream = 0; stream < 2; stream++) {
203 substream = pcm->streams[stream].substream;
204
205 ret = mmp_pcm_preallocate_dma_buffer(substream, stream);
206 if (ret)
207 goto err;
208 }
209
210 return 0;
211
212 err:
213 mmp_pcm_free_dma_buffers(pcm);
214 return ret;
215 }
216
217 static const struct snd_soc_component_driver mmp_soc_component = {
218 .name = DRV_NAME,
219 .ops = &mmp_pcm_ops,
220 .pcm_new = mmp_pcm_new,
221 .pcm_free = mmp_pcm_free_dma_buffers,
222 };
223
mmp_pcm_probe(struct platform_device * pdev)224 static int mmp_pcm_probe(struct platform_device *pdev)
225 {
226 struct mmp_audio_platdata *pdata = pdev->dev.platform_data;
227
228 if (pdata) {
229 mmp_pcm_hardware[SNDRV_PCM_STREAM_PLAYBACK].buffer_bytes_max =
230 pdata->buffer_max_playback;
231 mmp_pcm_hardware[SNDRV_PCM_STREAM_PLAYBACK].period_bytes_max =
232 pdata->period_max_playback;
233 mmp_pcm_hardware[SNDRV_PCM_STREAM_CAPTURE].buffer_bytes_max =
234 pdata->buffer_max_capture;
235 mmp_pcm_hardware[SNDRV_PCM_STREAM_CAPTURE].period_bytes_max =
236 pdata->period_max_capture;
237 }
238 return devm_snd_soc_register_component(&pdev->dev, &mmp_soc_component,
239 NULL, 0);
240 }
241
242 static struct platform_driver mmp_pcm_driver = {
243 .driver = {
244 .name = "mmp-pcm-audio",
245 },
246
247 .probe = mmp_pcm_probe,
248 };
249
250 module_platform_driver(mmp_pcm_driver);
251
252 MODULE_AUTHOR("Leo Yan <leoy@marvell.com>");
253 MODULE_DESCRIPTION("MMP Soc Audio DMA module");
254 MODULE_LICENSE("GPL");
255 MODULE_ALIAS("platform:mmp-pcm-audio");
256
