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f11a96d5 LG |
1 | /* |
2 | * linux/sound/arm/pxa2xx-pcm.c -- ALSA PCM interface for the Intel PXA2xx chip | |
3 | * | |
4 | * Author: Nicolas Pitre | |
5 | * Created: Nov 30, 2004 | |
6 | * Copyright: (C) 2004 MontaVista Software, Inc. | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | #include <linux/module.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/platform_device.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/dma-mapping.h> | |
18 | ||
19 | #include <sound/driver.h> | |
20 | #include <sound/core.h> | |
21 | #include <sound/pcm.h> | |
22 | #include <sound/pcm_params.h> | |
23 | #include <sound/soc.h> | |
24 | ||
25 | #include <asm/dma.h> | |
26 | #include <asm/hardware.h> | |
27 | #include <asm/arch/pxa-regs.h> | |
28 | #include <asm/arch/audio.h> | |
29 | ||
30 | #include "pxa2xx-pcm.h" | |
31 | ||
32 | static const struct snd_pcm_hardware pxa2xx_pcm_hardware = { | |
33 | .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 | .formats = SNDRV_PCM_FMTBIT_S16_LE | | |
39 | SNDRV_PCM_FMTBIT_S24_LE | | |
40 | SNDRV_PCM_FMTBIT_S32_LE, | |
41 | .period_bytes_min = 32, | |
42 | .period_bytes_max = 8192 - 32, | |
43 | .periods_min = 1, | |
44 | .periods_max = PAGE_SIZE/sizeof(pxa_dma_desc), | |
45 | .buffer_bytes_max = 128 * 1024, | |
46 | .fifo_size = 32, | |
47 | }; | |
48 | ||
49 | struct pxa2xx_runtime_data { | |
50 | int dma_ch; | |
51 | struct pxa2xx_pcm_dma_params *params; | |
52 | pxa_dma_desc *dma_desc_array; | |
53 | dma_addr_t dma_desc_array_phys; | |
54 | }; | |
55 | ||
56 | static void pxa2xx_pcm_dma_irq(int dma_ch, void *dev_id) | |
57 | { | |
58 | struct snd_pcm_substream *substream = dev_id; | |
59 | struct pxa2xx_runtime_data *prtd = substream->runtime->private_data; | |
60 | int dcsr; | |
61 | ||
62 | dcsr = DCSR(dma_ch); | |
63 | DCSR(dma_ch) = dcsr & ~DCSR_STOPIRQEN; | |
64 | ||
65 | if (dcsr & DCSR_ENDINTR) { | |
66 | snd_pcm_period_elapsed(substream); | |
67 | } else { | |
68 | printk( KERN_ERR "%s: DMA error on channel %d (DCSR=%#x)\n", | |
69 | prtd->params->name, dma_ch, dcsr ); | |
70 | } | |
71 | } | |
72 | ||
73 | static int pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream, | |
74 | struct snd_pcm_hw_params *params) | |
75 | { | |
76 | struct snd_pcm_runtime *runtime = substream->runtime; | |
77 | struct pxa2xx_runtime_data *prtd = runtime->private_data; | |
78 | struct snd_soc_pcm_runtime *rtd = substream->private_data; | |
79 | struct pxa2xx_pcm_dma_params *dma = rtd->cpu_dai->dma_data; | |
80 | size_t totsize = params_buffer_bytes(params); | |
81 | size_t period = params_period_bytes(params); | |
82 | pxa_dma_desc *dma_desc; | |
83 | dma_addr_t dma_buff_phys, next_desc_phys; | |
84 | int ret; | |
85 | ||
86 | /* this may get called several times by oss emulation | |
87 | * with different params */ | |
88 | if (prtd->params == NULL) { | |
89 | prtd->params = dma; | |
90 | ret = pxa_request_dma(prtd->params->name, DMA_PRIO_LOW, | |
91 | pxa2xx_pcm_dma_irq, substream); | |
92 | if (ret < 0) | |
93 | return ret; | |
94 | prtd->dma_ch = ret; | |
95 | } else if (prtd->params != dma) { | |
96 | pxa_free_dma(prtd->dma_ch); | |
97 | prtd->params = dma; | |
98 | ret = pxa_request_dma(prtd->params->name, DMA_PRIO_LOW, | |
99 | pxa2xx_pcm_dma_irq, substream); | |
100 | if (ret < 0) | |
101 | return ret; | |
102 | prtd->dma_ch = ret; | |
103 | } | |
104 | ||
105 | snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); | |
106 | runtime->dma_bytes = totsize; | |
107 | ||
108 | dma_desc = prtd->dma_desc_array; | |
109 | next_desc_phys = prtd->dma_desc_array_phys; | |
110 | dma_buff_phys = runtime->dma_addr; | |
111 | do { | |
112 | next_desc_phys += sizeof(pxa_dma_desc); | |
113 | dma_desc->ddadr = next_desc_phys; | |
114 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { | |
115 | dma_desc->dsadr = dma_buff_phys; | |
116 | dma_desc->dtadr = prtd->params->dev_addr; | |
117 | } else { | |
118 | dma_desc->dsadr = prtd->params->dev_addr; | |
119 | dma_desc->dtadr = dma_buff_phys; | |
120 | } | |
121 | if (period > totsize) | |
122 | period = totsize; | |
123 | dma_desc->dcmd = prtd->params->dcmd | period | DCMD_ENDIRQEN; | |
124 | dma_desc++; | |
125 | dma_buff_phys += period; | |
126 | } while (totsize -= period); | |
127 | dma_desc[-1].ddadr = prtd->dma_desc_array_phys; | |
128 | ||
129 | return 0; | |
130 | } | |
131 | ||
132 | static int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream) | |
133 | { | |
134 | struct pxa2xx_runtime_data *prtd = substream->runtime->private_data; | |
135 | ||
136 | if (prtd && prtd->params) | |
137 | *prtd->params->drcmr = 0; | |
138 | ||
139 | if (prtd->dma_ch) { | |
140 | snd_pcm_set_runtime_buffer(substream, NULL); | |
141 | pxa_free_dma(prtd->dma_ch); | |
142 | prtd->dma_ch = 0; | |
143 | } | |
144 | ||
145 | return 0; | |
146 | } | |
147 | ||
148 | static int pxa2xx_pcm_prepare(struct snd_pcm_substream *substream) | |
149 | { | |
150 | struct pxa2xx_runtime_data *prtd = substream->runtime->private_data; | |
151 | ||
152 | DCSR(prtd->dma_ch) &= ~DCSR_RUN; | |
153 | DCSR(prtd->dma_ch) = 0; | |
154 | DCMD(prtd->dma_ch) = 0; | |
155 | *prtd->params->drcmr = prtd->dma_ch | DRCMR_MAPVLD; | |
156 | ||
157 | return 0; | |
158 | } | |
159 | ||
160 | static int pxa2xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd) | |
161 | { | |
162 | struct pxa2xx_runtime_data *prtd = substream->runtime->private_data; | |
163 | int ret = 0; | |
164 | ||
165 | switch (cmd) { | |
166 | case SNDRV_PCM_TRIGGER_START: | |
167 | DDADR(prtd->dma_ch) = prtd->dma_desc_array_phys; | |
168 | DCSR(prtd->dma_ch) = DCSR_RUN; | |
169 | break; | |
170 | ||
171 | case SNDRV_PCM_TRIGGER_STOP: | |
172 | case SNDRV_PCM_TRIGGER_SUSPEND: | |
173 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: | |
174 | DCSR(prtd->dma_ch) &= ~DCSR_RUN; | |
175 | break; | |
176 | ||
177 | case SNDRV_PCM_TRIGGER_RESUME: | |
178 | DCSR(prtd->dma_ch) |= DCSR_RUN; | |
179 | break; | |
180 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: | |
181 | DDADR(prtd->dma_ch) = prtd->dma_desc_array_phys; | |
182 | DCSR(prtd->dma_ch) |= DCSR_RUN; | |
183 | break; | |
184 | ||
185 | default: | |
186 | ret = -EINVAL; | |
187 | } | |
188 | ||
189 | return ret; | |
190 | } | |
191 | ||
192 | static snd_pcm_uframes_t | |
193 | pxa2xx_pcm_pointer(struct snd_pcm_substream *substream) | |
194 | { | |
195 | struct snd_pcm_runtime *runtime = substream->runtime; | |
196 | struct pxa2xx_runtime_data *prtd = runtime->private_data; | |
197 | ||
198 | dma_addr_t ptr = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ? | |
199 | DSADR(prtd->dma_ch) : DTADR(prtd->dma_ch); | |
200 | snd_pcm_uframes_t x = bytes_to_frames(runtime, ptr - runtime->dma_addr); | |
201 | ||
202 | if (x == runtime->buffer_size) | |
203 | x = 0; | |
204 | return x; | |
205 | } | |
206 | ||
207 | static int pxa2xx_pcm_open(struct snd_pcm_substream *substream) | |
208 | { | |
209 | struct snd_pcm_runtime *runtime = substream->runtime; | |
210 | struct pxa2xx_runtime_data *prtd; | |
211 | int ret; | |
212 | ||
213 | snd_soc_set_runtime_hwparams(substream, &pxa2xx_pcm_hardware); | |
214 | ||
215 | /* | |
216 | * For mysterious reasons (and despite what the manual says) | |
217 | * playback samples are lost if the DMA count is not a multiple | |
218 | * of the DMA burst size. Let's add a rule to enforce that. | |
219 | */ | |
220 | ret = snd_pcm_hw_constraint_step(runtime, 0, | |
221 | SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32); | |
222 | if (ret) | |
223 | goto out; | |
224 | ||
225 | ret = snd_pcm_hw_constraint_step(runtime, 0, | |
226 | SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32); | |
227 | if (ret) | |
228 | goto out; | |
229 | ||
230 | prtd = kzalloc(sizeof(struct pxa2xx_runtime_data), GFP_KERNEL); | |
231 | if (prtd == NULL) { | |
232 | ret = -ENOMEM; | |
233 | goto out; | |
234 | } | |
235 | ||
236 | prtd->dma_desc_array = | |
237 | dma_alloc_writecombine(substream->pcm->card->dev, PAGE_SIZE, | |
238 | &prtd->dma_desc_array_phys, GFP_KERNEL); | |
239 | if (!prtd->dma_desc_array) { | |
240 | ret = -ENOMEM; | |
241 | goto err1; | |
242 | } | |
243 | ||
244 | runtime->private_data = prtd; | |
245 | return 0; | |
246 | ||
247 | err1: | |
248 | kfree(prtd); | |
249 | out: | |
250 | return ret; | |
251 | } | |
252 | ||
253 | static int pxa2xx_pcm_close(struct snd_pcm_substream *substream) | |
254 | { | |
255 | struct snd_pcm_runtime *runtime = substream->runtime; | |
256 | struct pxa2xx_runtime_data *prtd = runtime->private_data; | |
257 | ||
258 | dma_free_writecombine(substream->pcm->card->dev, PAGE_SIZE, | |
259 | prtd->dma_desc_array, prtd->dma_desc_array_phys); | |
260 | kfree(prtd); | |
261 | return 0; | |
262 | } | |
263 | ||
264 | static int pxa2xx_pcm_mmap(struct snd_pcm_substream *substream, | |
265 | struct vm_area_struct *vma) | |
266 | { | |
267 | struct snd_pcm_runtime *runtime = substream->runtime; | |
268 | return dma_mmap_writecombine(substream->pcm->card->dev, vma, | |
269 | runtime->dma_area, | |
270 | runtime->dma_addr, | |
271 | runtime->dma_bytes); | |
272 | } | |
273 | ||
274 | struct snd_pcm_ops pxa2xx_pcm_ops = { | |
275 | .open = pxa2xx_pcm_open, | |
276 | .close = pxa2xx_pcm_close, | |
277 | .ioctl = snd_pcm_lib_ioctl, | |
278 | .hw_params = pxa2xx_pcm_hw_params, | |
279 | .hw_free = pxa2xx_pcm_hw_free, | |
280 | .prepare = pxa2xx_pcm_prepare, | |
281 | .trigger = pxa2xx_pcm_trigger, | |
282 | .pointer = pxa2xx_pcm_pointer, | |
283 | .mmap = pxa2xx_pcm_mmap, | |
284 | }; | |
285 | ||
286 | static int pxa2xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream) | |
287 | { | |
288 | struct snd_pcm_substream *substream = pcm->streams[stream].substream; | |
289 | struct snd_dma_buffer *buf = &substream->dma_buffer; | |
290 | size_t size = pxa2xx_pcm_hardware.buffer_bytes_max; | |
291 | buf->dev.type = SNDRV_DMA_TYPE_DEV; | |
292 | buf->dev.dev = pcm->card->dev; | |
293 | buf->private_data = NULL; | |
294 | buf->area = dma_alloc_writecombine(pcm->card->dev, size, | |
295 | &buf->addr, GFP_KERNEL); | |
296 | if (!buf->area) | |
297 | return -ENOMEM; | |
298 | buf->bytes = size; | |
299 | return 0; | |
300 | } | |
301 | ||
302 | static void pxa2xx_pcm_free_dma_buffers(struct snd_pcm *pcm) | |
303 | { | |
304 | struct snd_pcm_substream *substream; | |
305 | struct snd_dma_buffer *buf; | |
306 | int stream; | |
307 | ||
308 | for (stream = 0; stream < 2; stream++) { | |
309 | substream = pcm->streams[stream].substream; | |
310 | if (!substream) | |
311 | continue; | |
312 | ||
313 | buf = &substream->dma_buffer; | |
314 | if (!buf->area) | |
315 | continue; | |
316 | ||
317 | dma_free_writecombine(pcm->card->dev, buf->bytes, | |
318 | buf->area, buf->addr); | |
319 | buf->area = NULL; | |
320 | } | |
321 | } | |
322 | ||
323 | static u64 pxa2xx_pcm_dmamask = DMA_32BIT_MASK; | |
324 | ||
325 | int pxa2xx_pcm_new(struct snd_card *card, struct snd_soc_codec_dai *dai, | |
326 | struct snd_pcm *pcm) | |
327 | { | |
328 | int ret = 0; | |
329 | ||
330 | if (!card->dev->dma_mask) | |
331 | card->dev->dma_mask = &pxa2xx_pcm_dmamask; | |
332 | if (!card->dev->coherent_dma_mask) | |
333 | card->dev->coherent_dma_mask = DMA_32BIT_MASK; | |
334 | ||
335 | if (dai->playback.channels_min) { | |
336 | ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, | |
337 | SNDRV_PCM_STREAM_PLAYBACK); | |
338 | if (ret) | |
339 | goto out; | |
340 | } | |
341 | ||
342 | if (dai->capture.channels_min) { | |
343 | ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, | |
344 | SNDRV_PCM_STREAM_CAPTURE); | |
345 | if (ret) | |
346 | goto out; | |
347 | } | |
348 | out: | |
349 | return ret; | |
350 | } | |
351 | ||
352 | struct snd_soc_platform pxa2xx_soc_platform = { | |
353 | .name = "pxa2xx-audio", | |
354 | .pcm_ops = &pxa2xx_pcm_ops, | |
355 | .pcm_new = pxa2xx_pcm_new, | |
356 | .pcm_free = pxa2xx_pcm_free_dma_buffers, | |
357 | }; | |
358 | ||
359 | EXPORT_SYMBOL_GPL(pxa2xx_soc_platform); | |
360 | ||
361 | MODULE_AUTHOR("Nicolas Pitre"); | |
362 | MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module"); | |
363 | MODULE_LICENSE("GPL"); |