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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 | ||
18b97dbe | 28 | static struct snd_pcm_hardware spear_pcm_hardware = { |
241b446f RK |
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 | ||
7c1c1d4a LPC |
67 | return snd_dmaengine_pcm_open_request_chan(substream, dma_data->filter, |
68 | dma_data); | |
241b446f RK |
69 | } |
70 | ||
71 | static int spear_pcm_mmap(struct snd_pcm_substream *substream, | |
72 | struct vm_area_struct *vma) | |
73 | { | |
74 | struct snd_pcm_runtime *runtime = substream->runtime; | |
75 | ||
76 | return dma_mmap_writecombine(substream->pcm->card->dev, vma, | |
77 | runtime->dma_area, runtime->dma_addr, | |
78 | runtime->dma_bytes); | |
79 | } | |
80 | ||
81 | static struct snd_pcm_ops spear_pcm_ops = { | |
82 | .open = spear_pcm_open, | |
7c1c1d4a | 83 | .close = snd_dmaengine_pcm_close_release_chan, |
241b446f RK |
84 | .ioctl = snd_pcm_lib_ioctl, |
85 | .hw_params = spear_pcm_hw_params, | |
86 | .hw_free = spear_pcm_hw_free, | |
87 | .trigger = snd_dmaengine_pcm_trigger, | |
88 | .pointer = snd_dmaengine_pcm_pointer, | |
89 | .mmap = spear_pcm_mmap, | |
90 | }; | |
91 | ||
92 | static int | |
93 | spear_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream, | |
94 | size_t size) | |
95 | { | |
96 | struct snd_pcm_substream *substream = pcm->streams[stream].substream; | |
97 | struct snd_dma_buffer *buf = &substream->dma_buffer; | |
98 | ||
99 | buf->dev.type = SNDRV_DMA_TYPE_DEV; | |
100 | buf->dev.dev = pcm->card->dev; | |
101 | buf->private_data = NULL; | |
102 | ||
103 | buf->area = dma_alloc_writecombine(pcm->card->dev, size, | |
104 | &buf->addr, GFP_KERNEL); | |
105 | if (!buf->area) | |
106 | return -ENOMEM; | |
107 | ||
108 | dev_info(buf->dev.dev, | |
109 | " preallocate_dma_buffer: area=%p, addr=%p, size=%d\n", | |
110 | (void *)buf->area, (void *)buf->addr, size); | |
111 | ||
112 | buf->bytes = size; | |
113 | return 0; | |
114 | } | |
115 | ||
116 | static void spear_pcm_free(struct snd_pcm *pcm) | |
117 | { | |
118 | struct snd_pcm_substream *substream; | |
119 | struct snd_dma_buffer *buf; | |
120 | int stream; | |
121 | ||
122 | for (stream = 0; stream < 2; stream++) { | |
123 | substream = pcm->streams[stream].substream; | |
124 | if (!substream) | |
125 | continue; | |
126 | ||
127 | buf = &substream->dma_buffer; | |
fd4fb262 | 128 | if (!buf || !buf->area) |
241b446f RK |
129 | continue; |
130 | ||
131 | dma_free_writecombine(pcm->card->dev, buf->bytes, | |
132 | buf->area, buf->addr); | |
133 | buf->area = NULL; | |
134 | } | |
135 | } | |
136 | ||
137 | static u64 spear_pcm_dmamask = DMA_BIT_MASK(32); | |
138 | ||
59d9cc2a | 139 | static int spear_pcm_new(struct snd_soc_pcm_runtime *rtd) |
241b446f | 140 | { |
59d9cc2a | 141 | struct snd_card *card = rtd->card->snd_card; |
241b446f RK |
142 | int ret; |
143 | ||
144 | if (!card->dev->dma_mask) | |
145 | card->dev->dma_mask = &spear_pcm_dmamask; | |
146 | if (!card->dev->coherent_dma_mask) | |
147 | card->dev->coherent_dma_mask = DMA_BIT_MASK(32); | |
148 | ||
59d9cc2a LPC |
149 | if (rtd->cpu_dai->driver->playback.channels_min) { |
150 | ret = spear_pcm_preallocate_dma_buffer(rtd->pcm, | |
241b446f RK |
151 | SNDRV_PCM_STREAM_PLAYBACK, |
152 | spear_pcm_hardware.buffer_bytes_max); | |
153 | if (ret) | |
154 | return ret; | |
155 | } | |
156 | ||
59d9cc2a LPC |
157 | if (rtd->cpu_dai->driver->capture.channels_min) { |
158 | ret = spear_pcm_preallocate_dma_buffer(rtd->pcm, | |
241b446f RK |
159 | SNDRV_PCM_STREAM_CAPTURE, |
160 | spear_pcm_hardware.buffer_bytes_max); | |
161 | if (ret) | |
162 | return ret; | |
163 | } | |
164 | ||
165 | return 0; | |
166 | } | |
167 | ||
18b97dbe | 168 | static struct snd_soc_platform_driver spear_soc_platform = { |
241b446f RK |
169 | .ops = &spear_pcm_ops, |
170 | .pcm_new = spear_pcm_new, | |
171 | .pcm_free = spear_pcm_free, | |
172 | }; | |
173 | ||
468c1175 | 174 | static int spear_soc_platform_probe(struct platform_device *pdev) |
241b446f RK |
175 | { |
176 | return snd_soc_register_platform(&pdev->dev, &spear_soc_platform); | |
177 | } | |
178 | ||
468c1175 | 179 | static int spear_soc_platform_remove(struct platform_device *pdev) |
241b446f RK |
180 | { |
181 | snd_soc_unregister_platform(&pdev->dev); | |
182 | ||
183 | return 0; | |
184 | } | |
185 | ||
186 | static struct platform_driver spear_pcm_driver = { | |
187 | .driver = { | |
188 | .name = "spear-pcm-audio", | |
189 | .owner = THIS_MODULE, | |
190 | }, | |
191 | ||
192 | .probe = spear_soc_platform_probe, | |
468c1175 | 193 | .remove = spear_soc_platform_remove, |
241b446f RK |
194 | }; |
195 | ||
196 | module_platform_driver(spear_pcm_driver); | |
197 | ||
198 | MODULE_AUTHOR("Rajeev Kumar <rajeev-dlh.kumar@st.com>"); | |
199 | MODULE_DESCRIPTION("SPEAr PCM DMA module"); | |
200 | MODULE_LICENSE("GPL"); | |
201 | MODULE_ALIAS("platform:spear-pcm-audio"); |