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92dfa619 BS |
1 | /* |
2 | * atmel-pcm.c -- ALSA PCM interface for the Atmel atmel SoC. | |
3 | * | |
4 | * Copyright (C) 2005 SAN People | |
5 | * Copyright (C) 2008 Atmel | |
6 | * | |
7 | * Authors: Sedji Gaouaou <sedji.gaouaou@atmel.com> | |
8 | * | |
9 | * Based on at91-pcm. by: | |
10 | * Frank Mandarino <fmandarino@endrelia.com> | |
11 | * Copyright 2006 Endrelia Technologies Inc. | |
12 | * | |
13 | * Based on pxa2xx-pcm.c by: | |
14 | * | |
15 | * Author: Nicolas Pitre | |
16 | * Created: Nov 30, 2004 | |
17 | * Copyright: (C) 2004 MontaVista Software, Inc. | |
18 | * | |
19 | * This program is free software; you can redistribute it and/or modify | |
20 | * it under the terms of the GNU General Public License as published by | |
21 | * the Free Software Foundation; either version 2 of the License, or | |
22 | * (at your option) any later version. | |
23 | * | |
24 | * This program is distributed in the hope that it will be useful, | |
25 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
26 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
27 | * GNU General Public License for more details. | |
28 | * | |
29 | * You should have received a copy of the GNU General Public License | |
30 | * along with this program; if not, write to the Free Software | |
31 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
32 | */ | |
33 | ||
34 | #include <linux/module.h> | |
35 | #include <linux/init.h> | |
36 | #include <linux/platform_device.h> | |
37 | #include <linux/slab.h> | |
38 | #include <linux/dma-mapping.h> | |
39 | #include <linux/atmel_pdc.h> | |
40 | #include <linux/atmel-ssc.h> | |
41 | ||
42 | #include <sound/core.h> | |
43 | #include <sound/pcm.h> | |
44 | #include <sound/pcm_params.h> | |
45 | #include <sound/soc.h> | |
46 | ||
47 | #include "atmel-pcm.h" | |
48 | ||
49 | ||
488cb533 AB |
50 | static int atmel_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, |
51 | int stream) | |
52 | { | |
53 | struct snd_pcm_substream *substream = pcm->streams[stream].substream; | |
54 | struct snd_dma_buffer *buf = &substream->dma_buffer; | |
55 | size_t size = ATMEL_SSC_DMABUF_SIZE; | |
56 | ||
57 | buf->dev.type = SNDRV_DMA_TYPE_DEV; | |
58 | buf->dev.dev = pcm->card->dev; | |
59 | buf->private_data = NULL; | |
60 | buf->area = dma_alloc_coherent(pcm->card->dev, size, | |
61 | &buf->addr, GFP_KERNEL); | |
62 | pr_debug("atmel-pcm: alloc dma buffer: area=%p, addr=%p, size=%zu\n", | |
63 | (void *)buf->area, (void *)(long)buf->addr, size); | |
64 | ||
65 | if (!buf->area) | |
66 | return -ENOMEM; | |
67 | ||
68 | buf->bytes = size; | |
69 | return 0; | |
70 | } | |
71 | ||
72 | static int atmel_pcm_mmap(struct snd_pcm_substream *substream, | |
73 | struct vm_area_struct *vma) | |
74 | { | |
75 | return remap_pfn_range(vma, vma->vm_start, | |
76 | substream->dma_buffer.addr >> PAGE_SHIFT, | |
77 | vma->vm_end - vma->vm_start, vma->vm_page_prot); | |
78 | } | |
79 | ||
80 | static int atmel_pcm_new(struct snd_soc_pcm_runtime *rtd) | |
81 | { | |
82 | struct snd_card *card = rtd->card->snd_card; | |
83 | struct snd_pcm *pcm = rtd->pcm; | |
84 | int ret; | |
85 | ||
86 | ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32)); | |
87 | if (ret) | |
88 | return ret; | |
89 | ||
90 | if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) { | |
91 | pr_debug("atmel-pcm: allocating PCM playback DMA buffer\n"); | |
92 | ret = atmel_pcm_preallocate_dma_buffer(pcm, | |
93 | SNDRV_PCM_STREAM_PLAYBACK); | |
94 | if (ret) | |
95 | goto out; | |
96 | } | |
97 | ||
98 | if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) { | |
99 | pr_debug("atmel-pcm: allocating PCM capture DMA buffer\n"); | |
100 | ret = atmel_pcm_preallocate_dma_buffer(pcm, | |
101 | SNDRV_PCM_STREAM_CAPTURE); | |
102 | if (ret) | |
103 | goto out; | |
104 | } | |
105 | out: | |
106 | return ret; | |
107 | } | |
108 | ||
109 | static void atmel_pcm_free(struct snd_pcm *pcm) | |
110 | { | |
111 | struct snd_pcm_substream *substream; | |
112 | struct snd_dma_buffer *buf; | |
113 | int stream; | |
114 | ||
115 | for (stream = 0; stream < 2; stream++) { | |
116 | substream = pcm->streams[stream].substream; | |
117 | if (!substream) | |
118 | continue; | |
119 | ||
120 | buf = &substream->dma_buffer; | |
121 | if (!buf->area) | |
122 | continue; | |
123 | dma_free_coherent(pcm->card->dev, buf->bytes, | |
124 | buf->area, buf->addr); | |
125 | buf->area = NULL; | |
126 | } | |
127 | } | |
128 | ||
92dfa619 BS |
129 | /*--------------------------------------------------------------------------*\ |
130 | * Hardware definition | |
131 | \*--------------------------------------------------------------------------*/ | |
132 | /* TODO: These values were taken from the AT91 platform driver, check | |
133 | * them against real values for AT32 | |
134 | */ | |
135 | static const struct snd_pcm_hardware atmel_pcm_hardware = { | |
136 | .info = SNDRV_PCM_INFO_MMAP | | |
137 | SNDRV_PCM_INFO_MMAP_VALID | | |
138 | SNDRV_PCM_INFO_INTERLEAVED | | |
139 | SNDRV_PCM_INFO_PAUSE, | |
92dfa619 BS |
140 | .period_bytes_min = 32, |
141 | .period_bytes_max = 8192, | |
142 | .periods_min = 2, | |
143 | .periods_max = 1024, | |
144 | .buffer_bytes_max = ATMEL_SSC_DMABUF_SIZE, | |
145 | }; | |
146 | ||
147 | ||
148 | /*--------------------------------------------------------------------------*\ | |
149 | * Data types | |
150 | \*--------------------------------------------------------------------------*/ | |
151 | struct atmel_runtime_data { | |
152 | struct atmel_pcm_dma_params *params; | |
153 | dma_addr_t dma_buffer; /* physical address of dma buffer */ | |
154 | dma_addr_t dma_buffer_end; /* first address beyond DMA buffer */ | |
155 | size_t period_size; | |
156 | ||
157 | dma_addr_t period_ptr; /* physical address of next period */ | |
92dfa619 BS |
158 | }; |
159 | ||
160 | /*--------------------------------------------------------------------------*\ | |
161 | * ISR | |
162 | \*--------------------------------------------------------------------------*/ | |
163 | static void atmel_pcm_dma_irq(u32 ssc_sr, | |
164 | struct snd_pcm_substream *substream) | |
165 | { | |
166 | struct atmel_runtime_data *prtd = substream->runtime->private_data; | |
167 | struct atmel_pcm_dma_params *params = prtd->params; | |
168 | static int count; | |
169 | ||
170 | count++; | |
171 | ||
172 | if (ssc_sr & params->mask->ssc_endbuf) { | |
173 | pr_warn("atmel-pcm: buffer %s on %s (SSC_SR=%#x, count=%d)\n", | |
174 | substream->stream == SNDRV_PCM_STREAM_PLAYBACK | |
175 | ? "underrun" : "overrun", | |
176 | params->name, ssc_sr, count); | |
177 | ||
178 | /* re-start the PDC */ | |
179 | ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR, | |
180 | params->mask->pdc_disable); | |
181 | prtd->period_ptr += prtd->period_size; | |
182 | if (prtd->period_ptr >= prtd->dma_buffer_end) | |
183 | prtd->period_ptr = prtd->dma_buffer; | |
184 | ||
185 | ssc_writex(params->ssc->regs, params->pdc->xpr, | |
186 | prtd->period_ptr); | |
187 | ssc_writex(params->ssc->regs, params->pdc->xcr, | |
188 | prtd->period_size / params->pdc_xfer_size); | |
189 | ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR, | |
190 | params->mask->pdc_enable); | |
191 | } | |
192 | ||
193 | if (ssc_sr & params->mask->ssc_endx) { | |
194 | /* Load the PDC next pointer and counter registers */ | |
195 | prtd->period_ptr += prtd->period_size; | |
196 | if (prtd->period_ptr >= prtd->dma_buffer_end) | |
197 | prtd->period_ptr = prtd->dma_buffer; | |
198 | ||
199 | ssc_writex(params->ssc->regs, params->pdc->xnpr, | |
200 | prtd->period_ptr); | |
201 | ssc_writex(params->ssc->regs, params->pdc->xncr, | |
202 | prtd->period_size / params->pdc_xfer_size); | |
203 | } | |
204 | ||
205 | snd_pcm_period_elapsed(substream); | |
206 | } | |
207 | ||
208 | ||
209 | /*--------------------------------------------------------------------------*\ | |
210 | * PCM operations | |
211 | \*--------------------------------------------------------------------------*/ | |
212 | static int atmel_pcm_hw_params(struct snd_pcm_substream *substream, | |
213 | struct snd_pcm_hw_params *params) | |
214 | { | |
215 | struct snd_pcm_runtime *runtime = substream->runtime; | |
216 | struct atmel_runtime_data *prtd = runtime->private_data; | |
217 | struct snd_soc_pcm_runtime *rtd = substream->private_data; | |
218 | ||
219 | /* this may get called several times by oss emulation | |
220 | * with different params */ | |
221 | ||
222 | snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); | |
223 | runtime->dma_bytes = params_buffer_bytes(params); | |
224 | ||
225 | prtd->params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); | |
226 | prtd->params->dma_intr_handler = atmel_pcm_dma_irq; | |
227 | ||
228 | prtd->dma_buffer = runtime->dma_addr; | |
229 | prtd->dma_buffer_end = runtime->dma_addr + runtime->dma_bytes; | |
230 | prtd->period_size = params_period_bytes(params); | |
231 | ||
232 | pr_debug("atmel-pcm: " | |
233 | "hw_params: DMA for %s initialized " | |
153f5a18 | 234 | "(dma_bytes=%zu, period_size=%zu)\n", |
92dfa619 BS |
235 | prtd->params->name, |
236 | runtime->dma_bytes, | |
237 | prtd->period_size); | |
238 | return 0; | |
239 | } | |
240 | ||
241 | static int atmel_pcm_hw_free(struct snd_pcm_substream *substream) | |
242 | { | |
243 | struct atmel_runtime_data *prtd = substream->runtime->private_data; | |
244 | struct atmel_pcm_dma_params *params = prtd->params; | |
245 | ||
246 | if (params != NULL) { | |
247 | ssc_writex(params->ssc->regs, SSC_PDC_PTCR, | |
248 | params->mask->pdc_disable); | |
249 | prtd->params->dma_intr_handler = NULL; | |
250 | } | |
251 | ||
252 | return 0; | |
253 | } | |
254 | ||
255 | static int atmel_pcm_prepare(struct snd_pcm_substream *substream) | |
256 | { | |
257 | struct atmel_runtime_data *prtd = substream->runtime->private_data; | |
258 | struct atmel_pcm_dma_params *params = prtd->params; | |
259 | ||
260 | ssc_writex(params->ssc->regs, SSC_IDR, | |
261 | params->mask->ssc_endx | params->mask->ssc_endbuf); | |
262 | ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR, | |
263 | params->mask->pdc_disable); | |
264 | return 0; | |
265 | } | |
266 | ||
267 | static int atmel_pcm_trigger(struct snd_pcm_substream *substream, | |
268 | int cmd) | |
269 | { | |
270 | struct snd_pcm_runtime *rtd = substream->runtime; | |
271 | struct atmel_runtime_data *prtd = rtd->private_data; | |
272 | struct atmel_pcm_dma_params *params = prtd->params; | |
273 | int ret = 0; | |
274 | ||
275 | pr_debug("atmel-pcm:buffer_size = %ld," | |
153f5a18 | 276 | "dma_area = %p, dma_bytes = %zu\n", |
92dfa619 BS |
277 | rtd->buffer_size, rtd->dma_area, rtd->dma_bytes); |
278 | ||
279 | switch (cmd) { | |
280 | case SNDRV_PCM_TRIGGER_START: | |
281 | prtd->period_ptr = prtd->dma_buffer; | |
282 | ||
283 | ssc_writex(params->ssc->regs, params->pdc->xpr, | |
284 | prtd->period_ptr); | |
285 | ssc_writex(params->ssc->regs, params->pdc->xcr, | |
286 | prtd->period_size / params->pdc_xfer_size); | |
287 | ||
288 | prtd->period_ptr += prtd->period_size; | |
289 | ssc_writex(params->ssc->regs, params->pdc->xnpr, | |
290 | prtd->period_ptr); | |
291 | ssc_writex(params->ssc->regs, params->pdc->xncr, | |
292 | prtd->period_size / params->pdc_xfer_size); | |
293 | ||
294 | pr_debug("atmel-pcm: trigger: " | |
295 | "period_ptr=%lx, xpr=%u, " | |
296 | "xcr=%u, xnpr=%u, xncr=%u\n", | |
297 | (unsigned long)prtd->period_ptr, | |
298 | ssc_readx(params->ssc->regs, params->pdc->xpr), | |
299 | ssc_readx(params->ssc->regs, params->pdc->xcr), | |
300 | ssc_readx(params->ssc->regs, params->pdc->xnpr), | |
301 | ssc_readx(params->ssc->regs, params->pdc->xncr)); | |
302 | ||
303 | ssc_writex(params->ssc->regs, SSC_IER, | |
304 | params->mask->ssc_endx | params->mask->ssc_endbuf); | |
305 | ssc_writex(params->ssc->regs, SSC_PDC_PTCR, | |
306 | params->mask->pdc_enable); | |
307 | ||
308 | pr_debug("sr=%u imr=%u\n", | |
309 | ssc_readx(params->ssc->regs, SSC_SR), | |
310 | ssc_readx(params->ssc->regs, SSC_IER)); | |
311 | break; /* SNDRV_PCM_TRIGGER_START */ | |
312 | ||
313 | case SNDRV_PCM_TRIGGER_STOP: | |
314 | case SNDRV_PCM_TRIGGER_SUSPEND: | |
315 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: | |
316 | ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR, | |
317 | params->mask->pdc_disable); | |
318 | break; | |
319 | ||
320 | case SNDRV_PCM_TRIGGER_RESUME: | |
321 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: | |
322 | ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR, | |
323 | params->mask->pdc_enable); | |
324 | break; | |
325 | ||
326 | default: | |
327 | ret = -EINVAL; | |
328 | } | |
329 | ||
330 | return ret; | |
331 | } | |
332 | ||
333 | static snd_pcm_uframes_t atmel_pcm_pointer( | |
334 | struct snd_pcm_substream *substream) | |
335 | { | |
336 | struct snd_pcm_runtime *runtime = substream->runtime; | |
337 | struct atmel_runtime_data *prtd = runtime->private_data; | |
338 | struct atmel_pcm_dma_params *params = prtd->params; | |
339 | dma_addr_t ptr; | |
340 | snd_pcm_uframes_t x; | |
341 | ||
342 | ptr = (dma_addr_t) ssc_readx(params->ssc->regs, params->pdc->xpr); | |
343 | x = bytes_to_frames(runtime, ptr - prtd->dma_buffer); | |
344 | ||
345 | if (x == runtime->buffer_size) | |
346 | x = 0; | |
347 | ||
348 | return x; | |
349 | } | |
350 | ||
351 | static int atmel_pcm_open(struct snd_pcm_substream *substream) | |
352 | { | |
353 | struct snd_pcm_runtime *runtime = substream->runtime; | |
354 | struct atmel_runtime_data *prtd; | |
355 | int ret = 0; | |
356 | ||
357 | snd_soc_set_runtime_hwparams(substream, &atmel_pcm_hardware); | |
358 | ||
359 | /* ensure that buffer size is a multiple of period size */ | |
360 | ret = snd_pcm_hw_constraint_integer(runtime, | |
361 | SNDRV_PCM_HW_PARAM_PERIODS); | |
362 | if (ret < 0) | |
363 | goto out; | |
364 | ||
365 | prtd = kzalloc(sizeof(struct atmel_runtime_data), GFP_KERNEL); | |
366 | if (prtd == NULL) { | |
367 | ret = -ENOMEM; | |
368 | goto out; | |
369 | } | |
370 | runtime->private_data = prtd; | |
371 | ||
372 | out: | |
373 | return ret; | |
374 | } | |
375 | ||
376 | static int atmel_pcm_close(struct snd_pcm_substream *substream) | |
377 | { | |
378 | struct atmel_runtime_data *prtd = substream->runtime->private_data; | |
379 | ||
380 | kfree(prtd); | |
381 | return 0; | |
382 | } | |
383 | ||
115c7254 | 384 | static const struct snd_pcm_ops atmel_pcm_ops = { |
92dfa619 BS |
385 | .open = atmel_pcm_open, |
386 | .close = atmel_pcm_close, | |
387 | .ioctl = snd_pcm_lib_ioctl, | |
388 | .hw_params = atmel_pcm_hw_params, | |
389 | .hw_free = atmel_pcm_hw_free, | |
390 | .prepare = atmel_pcm_prepare, | |
391 | .trigger = atmel_pcm_trigger, | |
392 | .pointer = atmel_pcm_pointer, | |
393 | .mmap = atmel_pcm_mmap, | |
394 | }; | |
395 | ||
92dfa619 BS |
396 | static struct snd_soc_platform_driver atmel_soc_platform = { |
397 | .ops = &atmel_pcm_ops, | |
398 | .pcm_new = atmel_pcm_new, | |
399 | .pcm_free = atmel_pcm_free, | |
92dfa619 BS |
400 | }; |
401 | ||
402 | int atmel_pcm_pdc_platform_register(struct device *dev) | |
403 | { | |
404 | return snd_soc_register_platform(dev, &atmel_soc_platform); | |
405 | } | |
406 | EXPORT_SYMBOL(atmel_pcm_pdc_platform_register); | |
407 | ||
408 | void atmel_pcm_pdc_platform_unregister(struct device *dev) | |
409 | { | |
410 | snd_soc_unregister_platform(dev); | |
411 | } | |
412 | EXPORT_SYMBOL(atmel_pcm_pdc_platform_unregister); | |
413 | ||
414 | MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>"); | |
415 | MODULE_DESCRIPTION("Atmel PCM module"); | |
416 | MODULE_LICENSE("GPL"); |