Commit | Line | Data |
---|---|---|
241b446f RK |
1 | /* |
2 | * ALSA PCM interface for ST SPEAr Processors | |
3 | * | |
4 | * sound/soc/spear/spear_pcm.c | |
5 | * | |
6 | * Copyright (C) 2012 ST Microelectronics | |
7 | * Rajeev Kumar<rajeev-dlh.kumar@st.com> | |
8 | * | |
9 | * This file is licensed under the terms of the GNU General Public | |
10 | * License version 2. This program is licensed "as is" without any | |
11 | * warranty of any kind, whether express or implied. | |
12 | */ | |
13 | ||
14 | #include <linux/module.h> | |
15 | #include <linux/dmaengine.h> | |
16 | #include <linux/dma-mapping.h> | |
17 | #include <linux/init.h> | |
18 | #include <linux/platform_device.h> | |
19 | #include <linux/scatterlist.h> | |
20 | #include <linux/slab.h> | |
21 | #include <sound/core.h> | |
22 | #include <sound/dmaengine_pcm.h> | |
23 | #include <sound/pcm.h> | |
24 | #include <sound/pcm_params.h> | |
25 | #include <sound/soc.h> | |
26 | #include <sound/spear_dma.h> | |
27 | ||
28 | struct snd_pcm_hardware spear_pcm_hardware = { | |
29 | .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER | | |
30 | SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | | |
31 | SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME), | |
32 | .buffer_bytes_max = 16 * 1024, /* max buffer size */ | |
33 | .period_bytes_min = 2 * 1024, /* 1 msec data minimum period size */ | |
34 | .period_bytes_max = 2 * 1024, /* maximum period size */ | |
35 | .periods_min = 1, /* min # periods */ | |
36 | .periods_max = 8, /* max # of periods */ | |
37 | .fifo_size = 0, /* fifo size in bytes */ | |
38 | }; | |
39 | ||
40 | static int spear_pcm_hw_params(struct snd_pcm_substream *substream, | |
41 | struct snd_pcm_hw_params *params) | |
42 | { | |
43 | snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); | |
44 | ||
45 | return 0; | |
46 | } | |
47 | ||
48 | static int spear_pcm_hw_free(struct snd_pcm_substream *substream) | |
49 | { | |
50 | snd_pcm_set_runtime_buffer(substream, NULL); | |
51 | ||
52 | return 0; | |
53 | } | |
54 | ||
55 | static int spear_pcm_open(struct snd_pcm_substream *substream) | |
56 | { | |
57 | struct snd_soc_pcm_runtime *rtd = substream->private_data; | |
58 | ||
59 | struct spear_dma_data *dma_data = (struct spear_dma_data *) | |
60 | snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); | |
61 | int ret; | |
62 | ||
63 | ret = snd_soc_set_runtime_hwparams(substream, &spear_pcm_hardware); | |
64 | if (ret) | |
65 | return ret; | |
66 | ||
67 | ret = snd_dmaengine_pcm_open(substream, dma_data->filter, dma_data); | |
68 | if (ret) | |
69 | return ret; | |
70 | ||
71 | snd_dmaengine_pcm_set_data(substream, dma_data); | |
72 | ||
73 | return 0; | |
74 | } | |
75 | ||
76 | static int spear_pcm_close(struct snd_pcm_substream *substream) | |
77 | { | |
78 | ||
79 | snd_dmaengine_pcm_close(substream); | |
80 | ||
81 | return 0; | |
82 | } | |
83 | ||
84 | static int spear_pcm_mmap(struct snd_pcm_substream *substream, | |
85 | struct vm_area_struct *vma) | |
86 | { | |
87 | struct snd_pcm_runtime *runtime = substream->runtime; | |
88 | ||
89 | return dma_mmap_writecombine(substream->pcm->card->dev, vma, | |
90 | runtime->dma_area, runtime->dma_addr, | |
91 | runtime->dma_bytes); | |
92 | } | |
93 | ||
94 | static struct snd_pcm_ops spear_pcm_ops = { | |
95 | .open = spear_pcm_open, | |
96 | .close = spear_pcm_close, | |
97 | .ioctl = snd_pcm_lib_ioctl, | |
98 | .hw_params = spear_pcm_hw_params, | |
99 | .hw_free = spear_pcm_hw_free, | |
100 | .trigger = snd_dmaengine_pcm_trigger, | |
101 | .pointer = snd_dmaengine_pcm_pointer, | |
102 | .mmap = spear_pcm_mmap, | |
103 | }; | |
104 | ||
105 | static int | |
106 | spear_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream, | |
107 | size_t size) | |
108 | { | |
109 | struct snd_pcm_substream *substream = pcm->streams[stream].substream; | |
110 | struct snd_dma_buffer *buf = &substream->dma_buffer; | |
111 | ||
112 | buf->dev.type = SNDRV_DMA_TYPE_DEV; | |
113 | buf->dev.dev = pcm->card->dev; | |
114 | buf->private_data = NULL; | |
115 | ||
116 | buf->area = dma_alloc_writecombine(pcm->card->dev, size, | |
117 | &buf->addr, GFP_KERNEL); | |
118 | if (!buf->area) | |
119 | return -ENOMEM; | |
120 | ||
121 | dev_info(buf->dev.dev, | |
122 | " preallocate_dma_buffer: area=%p, addr=%p, size=%d\n", | |
123 | (void *)buf->area, (void *)buf->addr, size); | |
124 | ||
125 | buf->bytes = size; | |
126 | return 0; | |
127 | } | |
128 | ||
129 | static void spear_pcm_free(struct snd_pcm *pcm) | |
130 | { | |
131 | struct snd_pcm_substream *substream; | |
132 | struct snd_dma_buffer *buf; | |
133 | int stream; | |
134 | ||
135 | for (stream = 0; stream < 2; stream++) { | |
136 | substream = pcm->streams[stream].substream; | |
137 | if (!substream) | |
138 | continue; | |
139 | ||
140 | buf = &substream->dma_buffer; | |
141 | if (!buf && !buf->area) | |
142 | continue; | |
143 | ||
144 | dma_free_writecombine(pcm->card->dev, buf->bytes, | |
145 | buf->area, buf->addr); | |
146 | buf->area = NULL; | |
147 | } | |
148 | } | |
149 | ||
150 | static u64 spear_pcm_dmamask = DMA_BIT_MASK(32); | |
151 | ||
152 | static int spear_pcm_new(struct snd_card *card, | |
153 | struct snd_soc_dai *dai, struct snd_pcm *pcm) | |
154 | { | |
155 | int ret; | |
156 | ||
157 | if (!card->dev->dma_mask) | |
158 | card->dev->dma_mask = &spear_pcm_dmamask; | |
159 | if (!card->dev->coherent_dma_mask) | |
160 | card->dev->coherent_dma_mask = DMA_BIT_MASK(32); | |
161 | ||
162 | if (dai->driver->playback.channels_min) { | |
163 | ret = spear_pcm_preallocate_dma_buffer(pcm, | |
164 | SNDRV_PCM_STREAM_PLAYBACK, | |
165 | spear_pcm_hardware.buffer_bytes_max); | |
166 | if (ret) | |
167 | return ret; | |
168 | } | |
169 | ||
170 | if (dai->driver->capture.channels_min) { | |
171 | ret = spear_pcm_preallocate_dma_buffer(pcm, | |
172 | SNDRV_PCM_STREAM_CAPTURE, | |
173 | spear_pcm_hardware.buffer_bytes_max); | |
174 | if (ret) | |
175 | return ret; | |
176 | } | |
177 | ||
178 | return 0; | |
179 | } | |
180 | ||
181 | struct snd_soc_platform_driver spear_soc_platform = { | |
182 | .ops = &spear_pcm_ops, | |
183 | .pcm_new = spear_pcm_new, | |
184 | .pcm_free = spear_pcm_free, | |
185 | }; | |
186 | ||
187 | static int __devinit spear_soc_platform_probe(struct platform_device *pdev) | |
188 | { | |
189 | return snd_soc_register_platform(&pdev->dev, &spear_soc_platform); | |
190 | } | |
191 | ||
192 | static int __devexit spear_soc_platform_remove(struct platform_device *pdev) | |
193 | { | |
194 | snd_soc_unregister_platform(&pdev->dev); | |
195 | ||
196 | return 0; | |
197 | } | |
198 | ||
199 | static struct platform_driver spear_pcm_driver = { | |
200 | .driver = { | |
201 | .name = "spear-pcm-audio", | |
202 | .owner = THIS_MODULE, | |
203 | }, | |
204 | ||
205 | .probe = spear_soc_platform_probe, | |
206 | .remove = __devexit_p(spear_soc_platform_remove), | |
207 | }; | |
208 | ||
209 | module_platform_driver(spear_pcm_driver); | |
210 | ||
211 | MODULE_AUTHOR("Rajeev Kumar <rajeev-dlh.kumar@st.com>"); | |
212 | MODULE_DESCRIPTION("SPEAr PCM DMA module"); | |
213 | MODULE_LICENSE("GPL"); | |
214 | MODULE_ALIAS("platform:spear-pcm-audio"); |