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a6d77317 DB |
1 | /* |
2 | * This program is free software; you can redistribute it and/or modify | |
3 | * it under the terms of the GNU General Public License version 2 as | |
4 | * published by the Free Software Foundation. | |
5 | */ | |
6 | ||
7 | #include <linux/module.h> | |
8 | #include <linux/dma-mapping.h> | |
9 | ||
10 | #include <sound/core.h> | |
11 | #include <sound/pcm.h> | |
12 | #include <sound/pcm_params.h> | |
13 | #include <sound/pxa2xx-lib.h> | |
14 | ||
5742964e | 15 | #include <mach/dma.h> |
a6d77317 DB |
16 | |
17 | #include "pxa2xx-pcm.h" | |
18 | ||
19 | static const struct snd_pcm_hardware pxa2xx_pcm_hardware = { | |
20 | .info = SNDRV_PCM_INFO_MMAP | | |
21 | SNDRV_PCM_INFO_MMAP_VALID | | |
22 | SNDRV_PCM_INFO_INTERLEAVED | | |
23 | SNDRV_PCM_INFO_PAUSE | | |
24 | SNDRV_PCM_INFO_RESUME, | |
25 | .formats = SNDRV_PCM_FMTBIT_S16_LE | | |
26 | SNDRV_PCM_FMTBIT_S24_LE | | |
27 | SNDRV_PCM_FMTBIT_S32_LE, | |
28 | .period_bytes_min = 32, | |
29 | .period_bytes_max = 8192 - 32, | |
30 | .periods_min = 1, | |
31 | .periods_max = PAGE_SIZE/sizeof(pxa_dma_desc), | |
32 | .buffer_bytes_max = 128 * 1024, | |
33 | .fifo_size = 32, | |
34 | }; | |
35 | ||
36 | int __pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream, | |
37 | struct snd_pcm_hw_params *params) | |
38 | { | |
39 | struct snd_pcm_runtime *runtime = substream->runtime; | |
40 | struct pxa2xx_runtime_data *rtd = runtime->private_data; | |
41 | size_t totsize = params_buffer_bytes(params); | |
42 | size_t period = params_period_bytes(params); | |
43 | pxa_dma_desc *dma_desc; | |
44 | dma_addr_t dma_buff_phys, next_desc_phys; | |
45 | ||
46 | snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); | |
47 | runtime->dma_bytes = totsize; | |
48 | ||
49 | dma_desc = rtd->dma_desc_array; | |
50 | next_desc_phys = rtd->dma_desc_array_phys; | |
51 | dma_buff_phys = runtime->dma_addr; | |
52 | do { | |
53 | next_desc_phys += sizeof(pxa_dma_desc); | |
54 | dma_desc->ddadr = next_desc_phys; | |
55 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { | |
56 | dma_desc->dsadr = dma_buff_phys; | |
57 | dma_desc->dtadr = rtd->params->dev_addr; | |
58 | } else { | |
59 | dma_desc->dsadr = rtd->params->dev_addr; | |
60 | dma_desc->dtadr = dma_buff_phys; | |
61 | } | |
62 | if (period > totsize) | |
63 | period = totsize; | |
64 | dma_desc->dcmd = rtd->params->dcmd | period | DCMD_ENDIRQEN; | |
65 | dma_desc++; | |
66 | dma_buff_phys += period; | |
67 | } while (totsize -= period); | |
68 | dma_desc[-1].ddadr = rtd->dma_desc_array_phys; | |
69 | ||
70 | return 0; | |
71 | } | |
72 | EXPORT_SYMBOL(__pxa2xx_pcm_hw_params); | |
73 | ||
74 | int __pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream) | |
75 | { | |
76 | struct pxa2xx_runtime_data *rtd = substream->runtime->private_data; | |
77 | ||
b7d4de7f | 78 | if (rtd && rtd->params && rtd->params->drcmr) |
a6d77317 DB |
79 | *rtd->params->drcmr = 0; |
80 | ||
81 | snd_pcm_set_runtime_buffer(substream, NULL); | |
82 | return 0; | |
83 | } | |
84 | EXPORT_SYMBOL(__pxa2xx_pcm_hw_free); | |
85 | ||
86 | int pxa2xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd) | |
87 | { | |
88 | struct pxa2xx_runtime_data *prtd = substream->runtime->private_data; | |
89 | int ret = 0; | |
90 | ||
91 | switch (cmd) { | |
92 | case SNDRV_PCM_TRIGGER_START: | |
93 | DDADR(prtd->dma_ch) = prtd->dma_desc_array_phys; | |
94 | DCSR(prtd->dma_ch) = DCSR_RUN; | |
95 | break; | |
96 | ||
97 | case SNDRV_PCM_TRIGGER_STOP: | |
98 | case SNDRV_PCM_TRIGGER_SUSPEND: | |
99 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: | |
100 | DCSR(prtd->dma_ch) &= ~DCSR_RUN; | |
101 | break; | |
102 | ||
103 | case SNDRV_PCM_TRIGGER_RESUME: | |
104 | DCSR(prtd->dma_ch) |= DCSR_RUN; | |
105 | break; | |
106 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: | |
107 | DDADR(prtd->dma_ch) = prtd->dma_desc_array_phys; | |
108 | DCSR(prtd->dma_ch) |= DCSR_RUN; | |
109 | break; | |
110 | ||
111 | default: | |
112 | ret = -EINVAL; | |
113 | } | |
114 | ||
115 | return ret; | |
116 | } | |
117 | EXPORT_SYMBOL(pxa2xx_pcm_trigger); | |
118 | ||
119 | snd_pcm_uframes_t | |
120 | pxa2xx_pcm_pointer(struct snd_pcm_substream *substream) | |
121 | { | |
122 | struct snd_pcm_runtime *runtime = substream->runtime; | |
123 | struct pxa2xx_runtime_data *prtd = runtime->private_data; | |
124 | ||
125 | dma_addr_t ptr = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ? | |
126 | DSADR(prtd->dma_ch) : DTADR(prtd->dma_ch); | |
127 | snd_pcm_uframes_t x = bytes_to_frames(runtime, ptr - runtime->dma_addr); | |
128 | ||
129 | if (x == runtime->buffer_size) | |
130 | x = 0; | |
131 | return x; | |
132 | } | |
133 | EXPORT_SYMBOL(pxa2xx_pcm_pointer); | |
134 | ||
135 | int __pxa2xx_pcm_prepare(struct snd_pcm_substream *substream) | |
136 | { | |
137 | struct pxa2xx_runtime_data *prtd = substream->runtime->private_data; | |
138 | ||
f8bae4ca MB |
139 | if (!prtd || !prtd->params) |
140 | return 0; | |
141 | ||
a6d77317 DB |
142 | DCSR(prtd->dma_ch) &= ~DCSR_RUN; |
143 | DCSR(prtd->dma_ch) = 0; | |
144 | DCMD(prtd->dma_ch) = 0; | |
145 | *prtd->params->drcmr = prtd->dma_ch | DRCMR_MAPVLD; | |
146 | ||
147 | return 0; | |
148 | } | |
149 | EXPORT_SYMBOL(__pxa2xx_pcm_prepare); | |
150 | ||
151 | void pxa2xx_pcm_dma_irq(int dma_ch, void *dev_id) | |
152 | { | |
153 | struct snd_pcm_substream *substream = dev_id; | |
154 | struct pxa2xx_runtime_data *rtd = substream->runtime->private_data; | |
155 | int dcsr; | |
156 | ||
157 | dcsr = DCSR(dma_ch); | |
158 | DCSR(dma_ch) = dcsr & ~DCSR_STOPIRQEN; | |
159 | ||
160 | if (dcsr & DCSR_ENDINTR) { | |
161 | snd_pcm_period_elapsed(substream); | |
162 | } else { | |
163 | printk(KERN_ERR "%s: DMA error on channel %d (DCSR=%#x)\n", | |
164 | rtd->params->name, dma_ch, dcsr); | |
165 | snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); | |
166 | } | |
167 | } | |
168 | EXPORT_SYMBOL(pxa2xx_pcm_dma_irq); | |
169 | ||
170 | int __pxa2xx_pcm_open(struct snd_pcm_substream *substream) | |
171 | { | |
172 | struct snd_pcm_runtime *runtime = substream->runtime; | |
173 | struct pxa2xx_runtime_data *rtd; | |
174 | int ret; | |
175 | ||
176 | runtime->hw = pxa2xx_pcm_hardware; | |
177 | ||
178 | /* | |
179 | * For mysterious reasons (and despite what the manual says) | |
180 | * playback samples are lost if the DMA count is not a multiple | |
181 | * of the DMA burst size. Let's add a rule to enforce that. | |
182 | */ | |
183 | ret = snd_pcm_hw_constraint_step(runtime, 0, | |
184 | SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32); | |
185 | if (ret) | |
186 | goto out; | |
187 | ||
188 | ret = snd_pcm_hw_constraint_step(runtime, 0, | |
189 | SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32); | |
190 | if (ret) | |
191 | goto out; | |
192 | ||
193 | ret = snd_pcm_hw_constraint_integer(runtime, | |
194 | SNDRV_PCM_HW_PARAM_PERIODS); | |
195 | if (ret < 0) | |
196 | goto out; | |
197 | ||
198 | ret = -ENOMEM; | |
13095c37 | 199 | rtd = kzalloc(sizeof(*rtd), GFP_KERNEL); |
a6d77317 DB |
200 | if (!rtd) |
201 | goto out; | |
202 | rtd->dma_desc_array = | |
203 | dma_alloc_writecombine(substream->pcm->card->dev, PAGE_SIZE, | |
204 | &rtd->dma_desc_array_phys, GFP_KERNEL); | |
205 | if (!rtd->dma_desc_array) | |
206 | goto err1; | |
207 | ||
208 | runtime->private_data = rtd; | |
209 | return 0; | |
210 | ||
211 | err1: | |
212 | kfree(rtd); | |
213 | out: | |
214 | return ret; | |
215 | } | |
216 | EXPORT_SYMBOL(__pxa2xx_pcm_open); | |
217 | ||
218 | int __pxa2xx_pcm_close(struct snd_pcm_substream *substream) | |
219 | { | |
220 | struct snd_pcm_runtime *runtime = substream->runtime; | |
221 | struct pxa2xx_runtime_data *rtd = runtime->private_data; | |
222 | ||
223 | dma_free_writecombine(substream->pcm->card->dev, PAGE_SIZE, | |
224 | rtd->dma_desc_array, rtd->dma_desc_array_phys); | |
225 | kfree(rtd); | |
226 | return 0; | |
227 | } | |
228 | EXPORT_SYMBOL(__pxa2xx_pcm_close); | |
229 | ||
230 | int pxa2xx_pcm_mmap(struct snd_pcm_substream *substream, | |
231 | struct vm_area_struct *vma) | |
232 | { | |
233 | struct snd_pcm_runtime *runtime = substream->runtime; | |
234 | return dma_mmap_writecombine(substream->pcm->card->dev, vma, | |
235 | runtime->dma_area, | |
236 | runtime->dma_addr, | |
237 | runtime->dma_bytes); | |
238 | } | |
239 | EXPORT_SYMBOL(pxa2xx_pcm_mmap); | |
240 | ||
241 | int pxa2xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream) | |
242 | { | |
243 | struct snd_pcm_substream *substream = pcm->streams[stream].substream; | |
244 | struct snd_dma_buffer *buf = &substream->dma_buffer; | |
245 | size_t size = pxa2xx_pcm_hardware.buffer_bytes_max; | |
246 | buf->dev.type = SNDRV_DMA_TYPE_DEV; | |
247 | buf->dev.dev = pcm->card->dev; | |
248 | buf->private_data = NULL; | |
249 | buf->area = dma_alloc_writecombine(pcm->card->dev, size, | |
250 | &buf->addr, GFP_KERNEL); | |
251 | if (!buf->area) | |
252 | return -ENOMEM; | |
253 | buf->bytes = size; | |
254 | return 0; | |
255 | } | |
256 | EXPORT_SYMBOL(pxa2xx_pcm_preallocate_dma_buffer); | |
257 | ||
258 | void pxa2xx_pcm_free_dma_buffers(struct snd_pcm *pcm) | |
259 | { | |
260 | struct snd_pcm_substream *substream; | |
261 | struct snd_dma_buffer *buf; | |
262 | int stream; | |
263 | ||
264 | for (stream = 0; stream < 2; stream++) { | |
265 | substream = pcm->streams[stream].substream; | |
266 | if (!substream) | |
267 | continue; | |
268 | buf = &substream->dma_buffer; | |
269 | if (!buf->area) | |
270 | continue; | |
271 | dma_free_writecombine(pcm->card->dev, buf->bytes, | |
272 | buf->area, buf->addr); | |
273 | buf->area = NULL; | |
274 | } | |
275 | } | |
276 | EXPORT_SYMBOL(pxa2xx_pcm_free_dma_buffers); | |
277 | ||
278 | MODULE_AUTHOR("Nicolas Pitre"); | |
279 | MODULE_DESCRIPTION("Intel PXA2xx sound library"); | |
280 | MODULE_LICENSE("GPL"); |