1
2
3
4
5
6
7
8
9
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 devm_snd_soc_register_platform(&pdev->dev, &mmp_soc_platform);
236}
237
238static struct platform_driver mmp_pcm_driver = {
239 .driver = {
240 .name = "mmp-pcm-audio",
241 },
242
243 .probe = mmp_pcm_probe,
244};
245
246module_platform_driver(mmp_pcm_driver);
247
248MODULE_AUTHOR("Leo Yan <leoy@marvell.com>");
249MODULE_DESCRIPTION("MMP Soc Audio DMA module");
250MODULE_LICENSE("GPL");
251MODULE_ALIAS("platform:mmp-pcm-audio");
252
