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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> | |
82075af6 | 25 | #include <mach/edma.h> |
310355c1 VB |
26 | |
27 | #include "davinci-pcm.h" | |
28 | ||
310355c1 VB |
29 | static struct snd_pcm_hardware davinci_pcm_hardware = { |
30 | .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER | | |
31 | SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | | |
32 | SNDRV_PCM_INFO_PAUSE), | |
33 | .formats = (SNDRV_PCM_FMTBIT_S16_LE), | |
34 | .rates = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 | | |
35 | SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | | |
36 | SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 | | |
37 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 | | |
38 | SNDRV_PCM_RATE_KNOT), | |
39 | .rate_min = 8000, | |
40 | .rate_max = 96000, | |
41 | .channels_min = 2, | |
42 | .channels_max = 2, | |
43 | .buffer_bytes_max = 128 * 1024, | |
44 | .period_bytes_min = 32, | |
45 | .period_bytes_max = 8 * 1024, | |
46 | .periods_min = 16, | |
47 | .periods_max = 255, | |
48 | .fifo_size = 0, | |
49 | }; | |
50 | ||
51 | struct davinci_runtime_data { | |
52 | spinlock_t lock; | |
53 | int period; /* current DMA period */ | |
54 | int master_lch; /* Master DMA channel */ | |
82075af6 | 55 | int slave_lch; /* linked parameter RAM reload slot */ |
310355c1 VB |
56 | struct davinci_pcm_dma_params *params; /* DMA params */ |
57 | }; | |
58 | ||
59 | static void davinci_pcm_enqueue_dma(struct snd_pcm_substream *substream) | |
60 | { | |
61 | struct davinci_runtime_data *prtd = substream->runtime->private_data; | |
62 | struct snd_pcm_runtime *runtime = substream->runtime; | |
63 | int lch = prtd->slave_lch; | |
64 | unsigned int period_size; | |
65 | unsigned int dma_offset; | |
66 | dma_addr_t dma_pos; | |
67 | dma_addr_t src, dst; | |
68 | unsigned short src_bidx, dst_bidx; | |
69 | unsigned int data_type; | |
70 | unsigned int count; | |
71 | ||
72 | period_size = snd_pcm_lib_period_bytes(substream); | |
73 | dma_offset = prtd->period * period_size; | |
74 | dma_pos = runtime->dma_addr + dma_offset; | |
75 | ||
9cd28ab0 AB |
76 | pr_debug("davinci_pcm: audio_set_dma_params_play channel = %d " |
77 | "dma_ptr = %x period_size=%x\n", lch, dma_pos, period_size); | |
310355c1 VB |
78 | |
79 | data_type = prtd->params->data_type; | |
80 | count = period_size / data_type; | |
81 | ||
82 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { | |
83 | src = dma_pos; | |
84 | dst = prtd->params->dma_addr; | |
85 | src_bidx = data_type; | |
86 | dst_bidx = 0; | |
87 | } else { | |
88 | src = prtd->params->dma_addr; | |
89 | dst = dma_pos; | |
90 | src_bidx = 0; | |
91 | dst_bidx = data_type; | |
92 | } | |
93 | ||
82075af6 DB |
94 | edma_set_src(lch, src, INCR, W8BIT); |
95 | edma_set_dest(lch, dst, INCR, W8BIT); | |
96 | edma_set_src_index(lch, src_bidx, 0); | |
97 | edma_set_dest_index(lch, dst_bidx, 0); | |
98 | edma_set_transfer_params(lch, data_type, count, 1, 0, ASYNC); | |
310355c1 VB |
99 | |
100 | prtd->period++; | |
101 | if (unlikely(prtd->period >= runtime->periods)) | |
102 | prtd->period = 0; | |
103 | } | |
104 | ||
82075af6 | 105 | static void davinci_pcm_dma_irq(unsigned lch, u16 ch_status, void *data) |
310355c1 VB |
106 | { |
107 | struct snd_pcm_substream *substream = data; | |
108 | struct davinci_runtime_data *prtd = substream->runtime->private_data; | |
109 | ||
9cd28ab0 | 110 | pr_debug("davinci_pcm: lch=%d, status=0x%x\n", lch, ch_status); |
310355c1 VB |
111 | |
112 | if (unlikely(ch_status != DMA_COMPLETE)) | |
113 | return; | |
114 | ||
115 | if (snd_pcm_running(substream)) { | |
116 | snd_pcm_period_elapsed(substream); | |
117 | ||
118 | spin_lock(&prtd->lock); | |
119 | davinci_pcm_enqueue_dma(substream); | |
120 | spin_unlock(&prtd->lock); | |
121 | } | |
122 | } | |
123 | ||
124 | static int davinci_pcm_dma_request(struct snd_pcm_substream *substream) | |
125 | { | |
126 | struct davinci_runtime_data *prtd = substream->runtime->private_data; | |
127 | struct snd_soc_pcm_runtime *rtd = substream->private_data; | |
128 | struct davinci_pcm_dma_params *dma_data = rtd->dai->cpu_dai->dma_data; | |
82075af6 | 129 | struct edmacc_param p_ram; |
310355c1 VB |
130 | int ret; |
131 | ||
132 | if (!dma_data) | |
133 | return -ENODEV; | |
134 | ||
135 | prtd->params = dma_data; | |
136 | ||
137 | /* Request master DMA channel */ | |
82075af6 | 138 | ret = edma_alloc_channel(prtd->params->channel, |
310355c1 | 139 | davinci_pcm_dma_irq, substream, |
82075af6 DB |
140 | EVENTQ_0); |
141 | if (ret < 0) | |
310355c1 | 142 | return ret; |
82075af6 | 143 | prtd->master_lch = ret; |
310355c1 | 144 | |
82075af6 DB |
145 | /* Request parameter RAM reload slot */ |
146 | ret = edma_alloc_slot(EDMA_SLOT_ANY); | |
147 | if (ret < 0) { | |
148 | edma_free_channel(prtd->master_lch); | |
310355c1 VB |
149 | return ret; |
150 | } | |
82075af6 DB |
151 | prtd->slave_lch = ret; |
152 | ||
153 | /* Issue transfer completion IRQ when the channel completes a | |
154 | * transfer, then always reload from the same slot (by a kind | |
155 | * of loopback link). The completion IRQ handler will update | |
156 | * the reload slot with a new buffer. | |
157 | * | |
158 | * REVISIT save p_ram here after setting up everything except | |
159 | * the buffer and its length (ccnt) ... use it as a template | |
160 | * so davinci_pcm_enqueue_dma() takes less time in IRQ. | |
161 | */ | |
162 | edma_read_slot(prtd->slave_lch, &p_ram); | |
163 | p_ram.opt |= TCINTEN | EDMA_TCC(prtd->master_lch); | |
164 | p_ram.link_bcntrld = prtd->slave_lch << 5; | |
165 | edma_write_slot(prtd->slave_lch, &p_ram); | |
310355c1 VB |
166 | |
167 | return 0; | |
168 | } | |
169 | ||
170 | static int davinci_pcm_trigger(struct snd_pcm_substream *substream, int cmd) | |
171 | { | |
172 | struct davinci_runtime_data *prtd = substream->runtime->private_data; | |
173 | int ret = 0; | |
174 | ||
175 | spin_lock(&prtd->lock); | |
176 | ||
177 | switch (cmd) { | |
178 | case SNDRV_PCM_TRIGGER_START: | |
179 | case SNDRV_PCM_TRIGGER_RESUME: | |
180 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: | |
82075af6 | 181 | edma_start(prtd->master_lch); |
310355c1 VB |
182 | break; |
183 | case SNDRV_PCM_TRIGGER_STOP: | |
184 | case SNDRV_PCM_TRIGGER_SUSPEND: | |
185 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: | |
82075af6 | 186 | edma_stop(prtd->master_lch); |
310355c1 VB |
187 | break; |
188 | default: | |
189 | ret = -EINVAL; | |
190 | break; | |
191 | } | |
192 | ||
193 | spin_unlock(&prtd->lock); | |
194 | ||
195 | return ret; | |
196 | } | |
197 | ||
198 | static int davinci_pcm_prepare(struct snd_pcm_substream *substream) | |
199 | { | |
200 | struct davinci_runtime_data *prtd = substream->runtime->private_data; | |
82075af6 | 201 | struct edmacc_param temp; |
310355c1 VB |
202 | |
203 | prtd->period = 0; | |
204 | davinci_pcm_enqueue_dma(substream); | |
205 | ||
82075af6 DB |
206 | /* Copy self-linked parameter RAM entry into master channel */ |
207 | edma_read_slot(prtd->slave_lch, &temp); | |
208 | edma_write_slot(prtd->master_lch, &temp); | |
310355c1 VB |
209 | |
210 | return 0; | |
211 | } | |
212 | ||
213 | static snd_pcm_uframes_t | |
214 | davinci_pcm_pointer(struct snd_pcm_substream *substream) | |
215 | { | |
216 | struct snd_pcm_runtime *runtime = substream->runtime; | |
217 | struct davinci_runtime_data *prtd = runtime->private_data; | |
218 | unsigned int offset; | |
219 | dma_addr_t count; | |
220 | dma_addr_t src, dst; | |
221 | ||
222 | spin_lock(&prtd->lock); | |
223 | ||
82075af6 | 224 | edma_get_position(prtd->master_lch, &src, &dst); |
310355c1 VB |
225 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
226 | count = src - runtime->dma_addr; | |
227 | else | |
c19a28e1 | 228 | count = dst - runtime->dma_addr; |
310355c1 VB |
229 | |
230 | spin_unlock(&prtd->lock); | |
231 | ||
232 | offset = bytes_to_frames(runtime, count); | |
233 | if (offset >= runtime->buffer_size) | |
234 | offset = 0; | |
235 | ||
236 | return offset; | |
237 | } | |
238 | ||
239 | static int davinci_pcm_open(struct snd_pcm_substream *substream) | |
240 | { | |
241 | struct snd_pcm_runtime *runtime = substream->runtime; | |
242 | struct davinci_runtime_data *prtd; | |
243 | int ret = 0; | |
244 | ||
245 | snd_soc_set_runtime_hwparams(substream, &davinci_pcm_hardware); | |
246 | ||
247 | prtd = kzalloc(sizeof(struct davinci_runtime_data), GFP_KERNEL); | |
248 | if (prtd == NULL) | |
249 | return -ENOMEM; | |
250 | ||
251 | spin_lock_init(&prtd->lock); | |
252 | ||
253 | runtime->private_data = prtd; | |
254 | ||
255 | ret = davinci_pcm_dma_request(substream); | |
256 | if (ret) { | |
257 | printk(KERN_ERR "davinci_pcm: Failed to get dma channels\n"); | |
258 | kfree(prtd); | |
259 | } | |
260 | ||
261 | return ret; | |
262 | } | |
263 | ||
264 | static int davinci_pcm_close(struct snd_pcm_substream *substream) | |
265 | { | |
266 | struct snd_pcm_runtime *runtime = substream->runtime; | |
267 | struct davinci_runtime_data *prtd = runtime->private_data; | |
268 | ||
82075af6 | 269 | edma_unlink(prtd->slave_lch); |
310355c1 | 270 | |
82075af6 DB |
271 | edma_free_slot(prtd->slave_lch); |
272 | edma_free_channel(prtd->master_lch); | |
310355c1 VB |
273 | |
274 | kfree(prtd); | |
275 | ||
276 | return 0; | |
277 | } | |
278 | ||
279 | static int davinci_pcm_hw_params(struct snd_pcm_substream *substream, | |
280 | struct snd_pcm_hw_params *hw_params) | |
281 | { | |
282 | return snd_pcm_lib_malloc_pages(substream, | |
283 | params_buffer_bytes(hw_params)); | |
284 | } | |
285 | ||
286 | static int davinci_pcm_hw_free(struct snd_pcm_substream *substream) | |
287 | { | |
288 | return snd_pcm_lib_free_pages(substream); | |
289 | } | |
290 | ||
291 | static int davinci_pcm_mmap(struct snd_pcm_substream *substream, | |
292 | struct vm_area_struct *vma) | |
293 | { | |
294 | struct snd_pcm_runtime *runtime = substream->runtime; | |
295 | ||
296 | return dma_mmap_writecombine(substream->pcm->card->dev, vma, | |
297 | runtime->dma_area, | |
298 | runtime->dma_addr, | |
299 | runtime->dma_bytes); | |
300 | } | |
301 | ||
b2a19d02 | 302 | static struct snd_pcm_ops davinci_pcm_ops = { |
310355c1 VB |
303 | .open = davinci_pcm_open, |
304 | .close = davinci_pcm_close, | |
305 | .ioctl = snd_pcm_lib_ioctl, | |
306 | .hw_params = davinci_pcm_hw_params, | |
307 | .hw_free = davinci_pcm_hw_free, | |
308 | .prepare = davinci_pcm_prepare, | |
309 | .trigger = davinci_pcm_trigger, | |
310 | .pointer = davinci_pcm_pointer, | |
311 | .mmap = davinci_pcm_mmap, | |
312 | }; | |
313 | ||
314 | static int davinci_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream) | |
315 | { | |
316 | struct snd_pcm_substream *substream = pcm->streams[stream].substream; | |
317 | struct snd_dma_buffer *buf = &substream->dma_buffer; | |
318 | size_t size = davinci_pcm_hardware.buffer_bytes_max; | |
319 | ||
320 | buf->dev.type = SNDRV_DMA_TYPE_DEV; | |
321 | buf->dev.dev = pcm->card->dev; | |
322 | buf->private_data = NULL; | |
323 | buf->area = dma_alloc_writecombine(pcm->card->dev, size, | |
324 | &buf->addr, GFP_KERNEL); | |
325 | ||
9cd28ab0 AB |
326 | pr_debug("davinci_pcm: preallocate_dma_buffer: area=%p, addr=%p, " |
327 | "size=%d\n", (void *) buf->area, (void *) buf->addr, size); | |
310355c1 VB |
328 | |
329 | if (!buf->area) | |
330 | return -ENOMEM; | |
331 | ||
332 | buf->bytes = size; | |
333 | return 0; | |
334 | } | |
335 | ||
336 | static void davinci_pcm_free(struct snd_pcm *pcm) | |
337 | { | |
338 | struct snd_pcm_substream *substream; | |
339 | struct snd_dma_buffer *buf; | |
340 | int stream; | |
341 | ||
342 | for (stream = 0; stream < 2; stream++) { | |
343 | substream = pcm->streams[stream].substream; | |
344 | if (!substream) | |
345 | continue; | |
346 | ||
347 | buf = &substream->dma_buffer; | |
348 | if (!buf->area) | |
349 | continue; | |
350 | ||
351 | dma_free_writecombine(pcm->card->dev, buf->bytes, | |
352 | buf->area, buf->addr); | |
353 | buf->area = NULL; | |
354 | } | |
355 | } | |
356 | ||
357 | static u64 davinci_pcm_dmamask = 0xffffffff; | |
358 | ||
359 | static int davinci_pcm_new(struct snd_card *card, | |
9cb132d7 | 360 | struct snd_soc_dai *dai, struct snd_pcm *pcm) |
310355c1 VB |
361 | { |
362 | int ret; | |
363 | ||
364 | if (!card->dev->dma_mask) | |
365 | card->dev->dma_mask = &davinci_pcm_dmamask; | |
366 | if (!card->dev->coherent_dma_mask) | |
367 | card->dev->coherent_dma_mask = 0xffffffff; | |
368 | ||
369 | if (dai->playback.channels_min) { | |
370 | ret = davinci_pcm_preallocate_dma_buffer(pcm, | |
371 | SNDRV_PCM_STREAM_PLAYBACK); | |
372 | if (ret) | |
373 | return ret; | |
374 | } | |
375 | ||
376 | if (dai->capture.channels_min) { | |
377 | ret = davinci_pcm_preallocate_dma_buffer(pcm, | |
378 | SNDRV_PCM_STREAM_CAPTURE); | |
379 | if (ret) | |
380 | return ret; | |
381 | } | |
382 | ||
383 | return 0; | |
384 | } | |
385 | ||
386 | struct snd_soc_platform davinci_soc_platform = { | |
387 | .name = "davinci-audio", | |
388 | .pcm_ops = &davinci_pcm_ops, | |
389 | .pcm_new = davinci_pcm_new, | |
390 | .pcm_free = davinci_pcm_free, | |
391 | }; | |
392 | EXPORT_SYMBOL_GPL(davinci_soc_platform); | |
393 | ||
c9b3a40f | 394 | static int __init davinci_soc_platform_init(void) |
958e792c MB |
395 | { |
396 | return snd_soc_register_platform(&davinci_soc_platform); | |
397 | } | |
398 | module_init(davinci_soc_platform_init); | |
399 | ||
400 | static void __exit davinci_soc_platform_exit(void) | |
401 | { | |
402 | snd_soc_unregister_platform(&davinci_soc_platform); | |
403 | } | |
404 | module_exit(davinci_soc_platform_exit); | |
405 | ||
310355c1 VB |
406 | MODULE_AUTHOR("Vladimir Barinov"); |
407 | MODULE_DESCRIPTION("TI DAVINCI PCM DMA module"); | |
408 | MODULE_LICENSE("GPL"); |