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310355c1 VB |
1 | /* |
2 | * ALSA PCM interface for the TI DAVINCI processor | |
3 | * | |
d6b52039 | 4 | * Author: Vladimir Barinov, <vbarinov@embeddedalley.com> |
310355c1 VB |
5 | * Copyright: (C) 2007 MontaVista Software, Inc., <source@mvista.com> |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
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> | |
9cd28ab0 | 17 | #include <linux/kernel.h> |
310355c1 VB |
18 | |
19 | #include <sound/core.h> | |
20 | #include <sound/pcm.h> | |
21 | #include <sound/pcm_params.h> | |
22 | #include <sound/soc.h> | |
23 | ||
24 | #include <asm/dma.h> | |
25 | ||
26 | #include "davinci-pcm.h" | |
27 | ||
310355c1 VB |
28 | static struct snd_pcm_hardware davinci_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), | |
32 | .formats = (SNDRV_PCM_FMTBIT_S16_LE), | |
33 | .rates = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 | | |
34 | SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | | |
35 | SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 | | |
36 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 | | |
37 | SNDRV_PCM_RATE_KNOT), | |
38 | .rate_min = 8000, | |
39 | .rate_max = 96000, | |
40 | .channels_min = 2, | |
41 | .channels_max = 2, | |
42 | .buffer_bytes_max = 128 * 1024, | |
43 | .period_bytes_min = 32, | |
44 | .period_bytes_max = 8 * 1024, | |
45 | .periods_min = 16, | |
46 | .periods_max = 255, | |
47 | .fifo_size = 0, | |
48 | }; | |
49 | ||
50 | struct davinci_runtime_data { | |
51 | spinlock_t lock; | |
52 | int period; /* current DMA period */ | |
53 | int master_lch; /* Master DMA channel */ | |
54 | int slave_lch; /* Slave DMA channel */ | |
55 | struct davinci_pcm_dma_params *params; /* DMA params */ | |
56 | }; | |
57 | ||
58 | static void davinci_pcm_enqueue_dma(struct snd_pcm_substream *substream) | |
59 | { | |
60 | struct davinci_runtime_data *prtd = substream->runtime->private_data; | |
61 | struct snd_pcm_runtime *runtime = substream->runtime; | |
62 | int lch = prtd->slave_lch; | |
63 | unsigned int period_size; | |
64 | unsigned int dma_offset; | |
65 | dma_addr_t dma_pos; | |
66 | dma_addr_t src, dst; | |
67 | unsigned short src_bidx, dst_bidx; | |
68 | unsigned int data_type; | |
69 | unsigned int count; | |
70 | ||
71 | period_size = snd_pcm_lib_period_bytes(substream); | |
72 | dma_offset = prtd->period * period_size; | |
73 | dma_pos = runtime->dma_addr + dma_offset; | |
74 | ||
9cd28ab0 AB |
75 | pr_debug("davinci_pcm: audio_set_dma_params_play channel = %d " |
76 | "dma_ptr = %x period_size=%x\n", lch, dma_pos, period_size); | |
310355c1 VB |
77 | |
78 | data_type = prtd->params->data_type; | |
79 | count = period_size / data_type; | |
80 | ||
81 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { | |
82 | src = dma_pos; | |
83 | dst = prtd->params->dma_addr; | |
84 | src_bidx = data_type; | |
85 | dst_bidx = 0; | |
86 | } else { | |
87 | src = prtd->params->dma_addr; | |
88 | dst = dma_pos; | |
89 | src_bidx = 0; | |
90 | dst_bidx = data_type; | |
91 | } | |
92 | ||
93 | davinci_set_dma_src_params(lch, src, INCR, W8BIT); | |
94 | davinci_set_dma_dest_params(lch, dst, INCR, W8BIT); | |
95 | davinci_set_dma_src_index(lch, src_bidx, 0); | |
96 | davinci_set_dma_dest_index(lch, dst_bidx, 0); | |
97 | davinci_set_dma_transfer_params(lch, data_type, count, 1, 0, ASYNC); | |
98 | ||
99 | prtd->period++; | |
100 | if (unlikely(prtd->period >= runtime->periods)) | |
101 | prtd->period = 0; | |
102 | } | |
103 | ||
104 | static void davinci_pcm_dma_irq(int lch, u16 ch_status, void *data) | |
105 | { | |
106 | struct snd_pcm_substream *substream = data; | |
107 | struct davinci_runtime_data *prtd = substream->runtime->private_data; | |
108 | ||
9cd28ab0 | 109 | pr_debug("davinci_pcm: lch=%d, status=0x%x\n", lch, ch_status); |
310355c1 VB |
110 | |
111 | if (unlikely(ch_status != DMA_COMPLETE)) | |
112 | return; | |
113 | ||
114 | if (snd_pcm_running(substream)) { | |
115 | snd_pcm_period_elapsed(substream); | |
116 | ||
117 | spin_lock(&prtd->lock); | |
118 | davinci_pcm_enqueue_dma(substream); | |
119 | spin_unlock(&prtd->lock); | |
120 | } | |
121 | } | |
122 | ||
123 | static int davinci_pcm_dma_request(struct snd_pcm_substream *substream) | |
124 | { | |
125 | struct davinci_runtime_data *prtd = substream->runtime->private_data; | |
126 | struct snd_soc_pcm_runtime *rtd = substream->private_data; | |
127 | struct davinci_pcm_dma_params *dma_data = rtd->dai->cpu_dai->dma_data; | |
128 | int tcc = TCC_ANY; | |
129 | int ret; | |
130 | ||
131 | if (!dma_data) | |
132 | return -ENODEV; | |
133 | ||
134 | prtd->params = dma_data; | |
135 | ||
136 | /* Request master DMA channel */ | |
137 | ret = davinci_request_dma(prtd->params->channel, prtd->params->name, | |
138 | davinci_pcm_dma_irq, substream, | |
139 | &prtd->master_lch, &tcc, EVENTQ_0); | |
140 | if (ret) | |
141 | return ret; | |
142 | ||
143 | /* Request slave DMA channel */ | |
144 | ret = davinci_request_dma(PARAM_ANY, "Link", | |
145 | NULL, NULL, &prtd->slave_lch, &tcc, EVENTQ_0); | |
146 | if (ret) { | |
147 | davinci_free_dma(prtd->master_lch); | |
148 | return ret; | |
149 | } | |
150 | ||
151 | /* Link slave DMA channel in loopback */ | |
152 | davinci_dma_link_lch(prtd->slave_lch, prtd->slave_lch); | |
153 | ||
154 | return 0; | |
155 | } | |
156 | ||
157 | static int davinci_pcm_trigger(struct snd_pcm_substream *substream, int cmd) | |
158 | { | |
159 | struct davinci_runtime_data *prtd = substream->runtime->private_data; | |
160 | int ret = 0; | |
161 | ||
162 | spin_lock(&prtd->lock); | |
163 | ||
164 | switch (cmd) { | |
165 | case SNDRV_PCM_TRIGGER_START: | |
166 | case SNDRV_PCM_TRIGGER_RESUME: | |
167 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: | |
168 | davinci_start_dma(prtd->master_lch); | |
169 | break; | |
170 | case SNDRV_PCM_TRIGGER_STOP: | |
171 | case SNDRV_PCM_TRIGGER_SUSPEND: | |
172 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: | |
173 | davinci_stop_dma(prtd->master_lch); | |
174 | break; | |
175 | default: | |
176 | ret = -EINVAL; | |
177 | break; | |
178 | } | |
179 | ||
180 | spin_unlock(&prtd->lock); | |
181 | ||
182 | return ret; | |
183 | } | |
184 | ||
185 | static int davinci_pcm_prepare(struct snd_pcm_substream *substream) | |
186 | { | |
187 | struct davinci_runtime_data *prtd = substream->runtime->private_data; | |
188 | struct paramentry_descriptor temp; | |
189 | ||
190 | prtd->period = 0; | |
191 | davinci_pcm_enqueue_dma(substream); | |
192 | ||
193 | /* Get slave channel dma params for master channel startup */ | |
194 | davinci_get_dma_params(prtd->slave_lch, &temp); | |
195 | davinci_set_dma_params(prtd->master_lch, &temp); | |
196 | ||
197 | return 0; | |
198 | } | |
199 | ||
200 | static snd_pcm_uframes_t | |
201 | davinci_pcm_pointer(struct snd_pcm_substream *substream) | |
202 | { | |
203 | struct snd_pcm_runtime *runtime = substream->runtime; | |
204 | struct davinci_runtime_data *prtd = runtime->private_data; | |
205 | unsigned int offset; | |
206 | dma_addr_t count; | |
207 | dma_addr_t src, dst; | |
208 | ||
209 | spin_lock(&prtd->lock); | |
210 | ||
211 | davinci_dma_getposition(prtd->master_lch, &src, &dst); | |
212 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) | |
213 | count = src - runtime->dma_addr; | |
214 | else | |
c19a28e1 | 215 | count = dst - runtime->dma_addr; |
310355c1 VB |
216 | |
217 | spin_unlock(&prtd->lock); | |
218 | ||
219 | offset = bytes_to_frames(runtime, count); | |
220 | if (offset >= runtime->buffer_size) | |
221 | offset = 0; | |
222 | ||
223 | return offset; | |
224 | } | |
225 | ||
226 | static int davinci_pcm_open(struct snd_pcm_substream *substream) | |
227 | { | |
228 | struct snd_pcm_runtime *runtime = substream->runtime; | |
229 | struct davinci_runtime_data *prtd; | |
230 | int ret = 0; | |
231 | ||
232 | snd_soc_set_runtime_hwparams(substream, &davinci_pcm_hardware); | |
233 | ||
234 | prtd = kzalloc(sizeof(struct davinci_runtime_data), GFP_KERNEL); | |
235 | if (prtd == NULL) | |
236 | return -ENOMEM; | |
237 | ||
238 | spin_lock_init(&prtd->lock); | |
239 | ||
240 | runtime->private_data = prtd; | |
241 | ||
242 | ret = davinci_pcm_dma_request(substream); | |
243 | if (ret) { | |
244 | printk(KERN_ERR "davinci_pcm: Failed to get dma channels\n"); | |
245 | kfree(prtd); | |
246 | } | |
247 | ||
248 | return ret; | |
249 | } | |
250 | ||
251 | static int davinci_pcm_close(struct snd_pcm_substream *substream) | |
252 | { | |
253 | struct snd_pcm_runtime *runtime = substream->runtime; | |
254 | struct davinci_runtime_data *prtd = runtime->private_data; | |
255 | ||
256 | davinci_dma_unlink_lch(prtd->slave_lch, prtd->slave_lch); | |
257 | ||
258 | davinci_free_dma(prtd->slave_lch); | |
259 | davinci_free_dma(prtd->master_lch); | |
260 | ||
261 | kfree(prtd); | |
262 | ||
263 | return 0; | |
264 | } | |
265 | ||
266 | static int davinci_pcm_hw_params(struct snd_pcm_substream *substream, | |
267 | struct snd_pcm_hw_params *hw_params) | |
268 | { | |
269 | return snd_pcm_lib_malloc_pages(substream, | |
270 | params_buffer_bytes(hw_params)); | |
271 | } | |
272 | ||
273 | static int davinci_pcm_hw_free(struct snd_pcm_substream *substream) | |
274 | { | |
275 | return snd_pcm_lib_free_pages(substream); | |
276 | } | |
277 | ||
278 | static int davinci_pcm_mmap(struct snd_pcm_substream *substream, | |
279 | struct vm_area_struct *vma) | |
280 | { | |
281 | struct snd_pcm_runtime *runtime = substream->runtime; | |
282 | ||
283 | return dma_mmap_writecombine(substream->pcm->card->dev, vma, | |
284 | runtime->dma_area, | |
285 | runtime->dma_addr, | |
286 | runtime->dma_bytes); | |
287 | } | |
288 | ||
b2a19d02 | 289 | static struct snd_pcm_ops davinci_pcm_ops = { |
310355c1 VB |
290 | .open = davinci_pcm_open, |
291 | .close = davinci_pcm_close, | |
292 | .ioctl = snd_pcm_lib_ioctl, | |
293 | .hw_params = davinci_pcm_hw_params, | |
294 | .hw_free = davinci_pcm_hw_free, | |
295 | .prepare = davinci_pcm_prepare, | |
296 | .trigger = davinci_pcm_trigger, | |
297 | .pointer = davinci_pcm_pointer, | |
298 | .mmap = davinci_pcm_mmap, | |
299 | }; | |
300 | ||
301 | static int davinci_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream) | |
302 | { | |
303 | struct snd_pcm_substream *substream = pcm->streams[stream].substream; | |
304 | struct snd_dma_buffer *buf = &substream->dma_buffer; | |
305 | size_t size = davinci_pcm_hardware.buffer_bytes_max; | |
306 | ||
307 | buf->dev.type = SNDRV_DMA_TYPE_DEV; | |
308 | buf->dev.dev = pcm->card->dev; | |
309 | buf->private_data = NULL; | |
310 | buf->area = dma_alloc_writecombine(pcm->card->dev, size, | |
311 | &buf->addr, GFP_KERNEL); | |
312 | ||
9cd28ab0 AB |
313 | pr_debug("davinci_pcm: preallocate_dma_buffer: area=%p, addr=%p, " |
314 | "size=%d\n", (void *) buf->area, (void *) buf->addr, size); | |
310355c1 VB |
315 | |
316 | if (!buf->area) | |
317 | return -ENOMEM; | |
318 | ||
319 | buf->bytes = size; | |
320 | return 0; | |
321 | } | |
322 | ||
323 | static void davinci_pcm_free(struct snd_pcm *pcm) | |
324 | { | |
325 | struct snd_pcm_substream *substream; | |
326 | struct snd_dma_buffer *buf; | |
327 | int stream; | |
328 | ||
329 | for (stream = 0; stream < 2; stream++) { | |
330 | substream = pcm->streams[stream].substream; | |
331 | if (!substream) | |
332 | continue; | |
333 | ||
334 | buf = &substream->dma_buffer; | |
335 | if (!buf->area) | |
336 | continue; | |
337 | ||
338 | dma_free_writecombine(pcm->card->dev, buf->bytes, | |
339 | buf->area, buf->addr); | |
340 | buf->area = NULL; | |
341 | } | |
342 | } | |
343 | ||
344 | static u64 davinci_pcm_dmamask = 0xffffffff; | |
345 | ||
346 | static int davinci_pcm_new(struct snd_card *card, | |
9cb132d7 | 347 | struct snd_soc_dai *dai, struct snd_pcm *pcm) |
310355c1 VB |
348 | { |
349 | int ret; | |
350 | ||
351 | if (!card->dev->dma_mask) | |
352 | card->dev->dma_mask = &davinci_pcm_dmamask; | |
353 | if (!card->dev->coherent_dma_mask) | |
354 | card->dev->coherent_dma_mask = 0xffffffff; | |
355 | ||
356 | if (dai->playback.channels_min) { | |
357 | ret = davinci_pcm_preallocate_dma_buffer(pcm, | |
358 | SNDRV_PCM_STREAM_PLAYBACK); | |
359 | if (ret) | |
360 | return ret; | |
361 | } | |
362 | ||
363 | if (dai->capture.channels_min) { | |
364 | ret = davinci_pcm_preallocate_dma_buffer(pcm, | |
365 | SNDRV_PCM_STREAM_CAPTURE); | |
366 | if (ret) | |
367 | return ret; | |
368 | } | |
369 | ||
370 | return 0; | |
371 | } | |
372 | ||
373 | struct snd_soc_platform davinci_soc_platform = { | |
374 | .name = "davinci-audio", | |
375 | .pcm_ops = &davinci_pcm_ops, | |
376 | .pcm_new = davinci_pcm_new, | |
377 | .pcm_free = davinci_pcm_free, | |
378 | }; | |
379 | EXPORT_SYMBOL_GPL(davinci_soc_platform); | |
380 | ||
c9b3a40f | 381 | static int __init davinci_soc_platform_init(void) |
958e792c MB |
382 | { |
383 | return snd_soc_register_platform(&davinci_soc_platform); | |
384 | } | |
385 | module_init(davinci_soc_platform_init); | |
386 | ||
387 | static void __exit davinci_soc_platform_exit(void) | |
388 | { | |
389 | snd_soc_unregister_platform(&davinci_soc_platform); | |
390 | } | |
391 | module_exit(davinci_soc_platform_exit); | |
392 | ||
310355c1 VB |
393 | MODULE_AUTHOR("Vladimir Barinov"); |
394 | MODULE_DESCRIPTION("TI DAVINCI PCM DMA module"); | |
395 | MODULE_LICENSE("GPL"); |