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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
50/*--------------------------------------------------------------------------*\
51 * Hardware definition
52\*--------------------------------------------------------------------------*/
53/* TODO: These values were taken from the AT91 platform driver, check
54 * them against real values for AT32
55 */
56static const struct snd_pcm_hardware atmel_pcm_hardware = {
57 .info = SNDRV_PCM_INFO_MMAP |
58 SNDRV_PCM_INFO_MMAP_VALID |
59 SNDRV_PCM_INFO_INTERLEAVED |
60 SNDRV_PCM_INFO_PAUSE,
61 .formats = SNDRV_PCM_FMTBIT_S16_LE,
62 .period_bytes_min = 32,
63 .period_bytes_max = 8192,
64 .periods_min = 2,
65 .periods_max = 1024,
66 .buffer_bytes_max = 32 * 1024,
67};
68
69
70/*--------------------------------------------------------------------------*\
71 * Data types
72\*--------------------------------------------------------------------------*/
73struct atmel_runtime_data {
74 struct atmel_pcm_dma_params *params;
75 dma_addr_t dma_buffer; /* physical address of dma buffer */
76 dma_addr_t dma_buffer_end; /* first address beyond DMA buffer */
77 size_t period_size;
78
79 dma_addr_t period_ptr; /* physical address of next period */
80
81 /* PDC register save */
82 u32 pdc_xpr_save;
83 u32 pdc_xcr_save;
84 u32 pdc_xnpr_save;
85 u32 pdc_xncr_save;
86};
87
88
89/*--------------------------------------------------------------------------*\
90 * Helper functions
91\*--------------------------------------------------------------------------*/
92static int atmel_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
93 int stream)
94{
95 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
96 struct snd_dma_buffer *buf = &substream->dma_buffer;
97 size_t size = atmel_pcm_hardware.buffer_bytes_max;
98
99 buf->dev.type = SNDRV_DMA_TYPE_DEV;
100 buf->dev.dev = pcm->card->dev;
101 buf->private_data = NULL;
102 buf->area = dma_alloc_coherent(pcm->card->dev, size,
103 &buf->addr, GFP_KERNEL);
104 pr_debug("atmel-pcm:"
105 "preallocate_dma_buffer: area=%p, addr=%p, size=%d\n",
106 (void *) buf->area,
107 (void *) buf->addr,
108 size);
109
110 if (!buf->area)
111 return -ENOMEM;
112
113 buf->bytes = size;
114 return 0;
115}
116/*--------------------------------------------------------------------------*\
117 * ISR
118\*--------------------------------------------------------------------------*/
119static void atmel_pcm_dma_irq(u32 ssc_sr,
120 struct snd_pcm_substream *substream)
121{
122 struct atmel_runtime_data *prtd = substream->runtime->private_data;
123 struct atmel_pcm_dma_params *params = prtd->params;
124 static int count;
125
126 count++;
127
128 if (ssc_sr & params->mask->ssc_endbuf) {
129 pr_warning("atmel-pcm: buffer %s on %s"
130 " (SSC_SR=%#x, count=%d)\n",
131 substream->stream == SNDRV_PCM_STREAM_PLAYBACK
132 ? "underrun" : "overrun",
133 params->name, ssc_sr, count);
134
135 /* re-start the PDC */
136 ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
137 params->mask->pdc_disable);
138 prtd->period_ptr += prtd->period_size;
139 if (prtd->period_ptr >= prtd->dma_buffer_end)
140 prtd->period_ptr = prtd->dma_buffer;
141
142 ssc_writex(params->ssc->regs, params->pdc->xpr,
143 prtd->period_ptr);
144 ssc_writex(params->ssc->regs, params->pdc->xcr,
145 prtd->period_size / params->pdc_xfer_size);
146 ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
147 params->mask->pdc_enable);
148 }
149
150 if (ssc_sr & params->mask->ssc_endx) {
151 /* Load the PDC next pointer and counter registers */
152 prtd->period_ptr += prtd->period_size;
153 if (prtd->period_ptr >= prtd->dma_buffer_end)
154 prtd->period_ptr = prtd->dma_buffer;
155
156 ssc_writex(params->ssc->regs, params->pdc->xnpr,
157 prtd->period_ptr);
158 ssc_writex(params->ssc->regs, params->pdc->xncr,
159 prtd->period_size / params->pdc_xfer_size);
160 }
161
162 snd_pcm_period_elapsed(substream);
163}
164
165
166/*--------------------------------------------------------------------------*\
167 * PCM operations
168\*--------------------------------------------------------------------------*/
169static int atmel_pcm_hw_params(struct snd_pcm_substream *substream,
170 struct snd_pcm_hw_params *params)
171{
172 struct snd_pcm_runtime *runtime = substream->runtime;
173 struct atmel_runtime_data *prtd = runtime->private_data;
174 struct snd_soc_pcm_runtime *rtd = substream->private_data;
175
176 /* this may get called several times by oss emulation
177 * with different params */
178
179 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
180 runtime->dma_bytes = params_buffer_bytes(params);
181
182 prtd->params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
183 prtd->params->dma_intr_handler = atmel_pcm_dma_irq;
184
185 prtd->dma_buffer = runtime->dma_addr;
186 prtd->dma_buffer_end = runtime->dma_addr + runtime->dma_bytes;
187 prtd->period_size = params_period_bytes(params);
188
189 pr_debug("atmel-pcm: "
190 "hw_params: DMA for %s initialized "
191 "(dma_bytes=%u, period_size=%u)\n",
192 prtd->params->name,
193 runtime->dma_bytes,
194 prtd->period_size);
195 return 0;
196}
197
198static int atmel_pcm_hw_free(struct snd_pcm_substream *substream)
199{
200 struct atmel_runtime_data *prtd = substream->runtime->private_data;
201 struct atmel_pcm_dma_params *params = prtd->params;
202
203 if (params != NULL) {
204 ssc_writex(params->ssc->regs, SSC_PDC_PTCR,
205 params->mask->pdc_disable);
206 prtd->params->dma_intr_handler = NULL;
207 }
208
209 return 0;
210}
211
212static int atmel_pcm_prepare(struct snd_pcm_substream *substream)
213{
214 struct atmel_runtime_data *prtd = substream->runtime->private_data;
215 struct atmel_pcm_dma_params *params = prtd->params;
216
217 ssc_writex(params->ssc->regs, SSC_IDR,
218 params->mask->ssc_endx | params->mask->ssc_endbuf);
219 ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
220 params->mask->pdc_disable);
221 return 0;
222}
223
224static int atmel_pcm_trigger(struct snd_pcm_substream *substream,
225 int cmd)
226{
227 struct snd_pcm_runtime *rtd = substream->runtime;
228 struct atmel_runtime_data *prtd = rtd->private_data;
229 struct atmel_pcm_dma_params *params = prtd->params;
230 int ret = 0;
231
232 pr_debug("atmel-pcm:buffer_size = %ld,"
233 "dma_area = %p, dma_bytes = %u\n",
234 rtd->buffer_size, rtd->dma_area, rtd->dma_bytes);
235
236 switch (cmd) {
237 case SNDRV_PCM_TRIGGER_START:
238 prtd->period_ptr = prtd->dma_buffer;
239
240 ssc_writex(params->ssc->regs, params->pdc->xpr,
241 prtd->period_ptr);
242 ssc_writex(params->ssc->regs, params->pdc->xcr,
243 prtd->period_size / params->pdc_xfer_size);
244
245 prtd->period_ptr += prtd->period_size;
246 ssc_writex(params->ssc->regs, params->pdc->xnpr,
247 prtd->period_ptr);
248 ssc_writex(params->ssc->regs, params->pdc->xncr,
249 prtd->period_size / params->pdc_xfer_size);
250
251 pr_debug("atmel-pcm: trigger: "
252 "period_ptr=%lx, xpr=%u, "
253 "xcr=%u, xnpr=%u, xncr=%u\n",
254 (unsigned long)prtd->period_ptr,
255 ssc_readx(params->ssc->regs, params->pdc->xpr),
256 ssc_readx(params->ssc->regs, params->pdc->xcr),
257 ssc_readx(params->ssc->regs, params->pdc->xnpr),
258 ssc_readx(params->ssc->regs, params->pdc->xncr));
259
260 ssc_writex(params->ssc->regs, SSC_IER,
261 params->mask->ssc_endx | params->mask->ssc_endbuf);
262 ssc_writex(params->ssc->regs, SSC_PDC_PTCR,
263 params->mask->pdc_enable);
264
265 pr_debug("sr=%u imr=%u\n",
266 ssc_readx(params->ssc->regs, SSC_SR),
267 ssc_readx(params->ssc->regs, SSC_IER));
268 break; /* SNDRV_PCM_TRIGGER_START */
269
270 case SNDRV_PCM_TRIGGER_STOP:
271 case SNDRV_PCM_TRIGGER_SUSPEND:
272 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
273 ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
274 params->mask->pdc_disable);
275 break;
276
277 case SNDRV_PCM_TRIGGER_RESUME:
278 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
279 ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
280 params->mask->pdc_enable);
281 break;
282
283 default:
284 ret = -EINVAL;
285 }
286
287 return ret;
288}
289
290static snd_pcm_uframes_t atmel_pcm_pointer(
291 struct snd_pcm_substream *substream)
292{
293 struct snd_pcm_runtime *runtime = substream->runtime;
294 struct atmel_runtime_data *prtd = runtime->private_data;
295 struct atmel_pcm_dma_params *params = prtd->params;
296 dma_addr_t ptr;
297 snd_pcm_uframes_t x;
298
299 ptr = (dma_addr_t) ssc_readx(params->ssc->regs, params->pdc->xpr);
300 x = bytes_to_frames(runtime, ptr - prtd->dma_buffer);
301
302 if (x == runtime->buffer_size)
303 x = 0;
304
305 return x;
306}
307
308static int atmel_pcm_open(struct snd_pcm_substream *substream)
309{
310 struct snd_pcm_runtime *runtime = substream->runtime;
311 struct atmel_runtime_data *prtd;
312 int ret = 0;
313
314 snd_soc_set_runtime_hwparams(substream, &atmel_pcm_hardware);
315
316 /* ensure that buffer size is a multiple of period size */
317 ret = snd_pcm_hw_constraint_integer(runtime,
318 SNDRV_PCM_HW_PARAM_PERIODS);
319 if (ret < 0)
320 goto out;
321
322 prtd = kzalloc(sizeof(struct atmel_runtime_data), GFP_KERNEL);
323 if (prtd == NULL) {
324 ret = -ENOMEM;
325 goto out;
326 }
327 runtime->private_data = prtd;
328
329 out:
330 return ret;
331}
332
333static int atmel_pcm_close(struct snd_pcm_substream *substream)
334{
335 struct atmel_runtime_data *prtd = substream->runtime->private_data;
336
337 kfree(prtd);
338 return 0;
339}
340
341static int atmel_pcm_mmap(struct snd_pcm_substream *substream,
342 struct vm_area_struct *vma)
343{
344 return remap_pfn_range(vma, vma->vm_start,
345 substream->dma_buffer.addr >> PAGE_SHIFT,
346 vma->vm_end - vma->vm_start, vma->vm_page_prot);
347}
348
349static struct snd_pcm_ops atmel_pcm_ops = {
350 .open = atmel_pcm_open,
351 .close = atmel_pcm_close,
352 .ioctl = snd_pcm_lib_ioctl,
353 .hw_params = atmel_pcm_hw_params,
354 .hw_free = atmel_pcm_hw_free,
355 .prepare = atmel_pcm_prepare,
356 .trigger = atmel_pcm_trigger,
357 .pointer = atmel_pcm_pointer,
358 .mmap = atmel_pcm_mmap,
359};
360
361
362/*--------------------------------------------------------------------------*\
363 * ASoC platform driver
364\*--------------------------------------------------------------------------*/
365static u64 atmel_pcm_dmamask = 0xffffffff;
366
367static int atmel_pcm_new(struct snd_soc_pcm_runtime *rtd)
368{
369 struct snd_card *card = rtd->card->snd_card;
370 struct snd_soc_dai *dai = rtd->cpu_dai;
371 struct snd_pcm *pcm = rtd->pcm;
372 int ret = 0;
373
374 if (!card->dev->dma_mask)
375 card->dev->dma_mask = &atmel_pcm_dmamask;
376 if (!card->dev->coherent_dma_mask)
377 card->dev->coherent_dma_mask = 0xffffffff;
378
379 if (dai->driver->playback.channels_min) {
380 ret = atmel_pcm_preallocate_dma_buffer(pcm,
381 SNDRV_PCM_STREAM_PLAYBACK);
382 if (ret)
383 goto out;
384 }
385
386 if (dai->driver->capture.channels_min) {
387 pr_debug("atmel-pcm:"
388 "Allocating PCM capture DMA buffer\n");
389 ret = atmel_pcm_preallocate_dma_buffer(pcm,
390 SNDRV_PCM_STREAM_CAPTURE);
391 if (ret)
392 goto out;
393 }
394 out:
395 return ret;
396}
397
398static void atmel_pcm_free_dma_buffers(struct snd_pcm *pcm)
399{
400 struct snd_pcm_substream *substream;
401 struct snd_dma_buffer *buf;
402 int stream;
403
404 for (stream = 0; stream < 2; stream++) {
405 substream = pcm->streams[stream].substream;
406 if (!substream)
407 continue;
408
409 buf = &substream->dma_buffer;
410 if (!buf->area)
411 continue;
412 dma_free_coherent(pcm->card->dev, buf->bytes,
413 buf->area, buf->addr);
414 buf->area = NULL;
415 }
416}
417
418#ifdef CONFIG_PM
419static int atmel_pcm_suspend(struct snd_soc_dai *dai)
420{
421 struct snd_pcm_runtime *runtime = dai->runtime;
422 struct atmel_runtime_data *prtd;
423 struct atmel_pcm_dma_params *params;
424
425 if (!runtime)
426 return 0;
427
428 prtd = runtime->private_data;
429 params = prtd->params;
430
431 /* disable the PDC and save the PDC registers */
432
433 ssc_writel(params->ssc->regs, PDC_PTCR, params->mask->pdc_disable);
434
435 prtd->pdc_xpr_save = ssc_readx(params->ssc->regs, params->pdc->xpr);
436 prtd->pdc_xcr_save = ssc_readx(params->ssc->regs, params->pdc->xcr);
437 prtd->pdc_xnpr_save = ssc_readx(params->ssc->regs, params->pdc->xnpr);
438 prtd->pdc_xncr_save = ssc_readx(params->ssc->regs, params->pdc->xncr);
439
440 return 0;
441}
442
443static int atmel_pcm_resume(struct snd_soc_dai *dai)
444{
445 struct snd_pcm_runtime *runtime = dai->runtime;
446 struct atmel_runtime_data *prtd;
447 struct atmel_pcm_dma_params *params;
448
449 if (!runtime)
450 return 0;
451
452 prtd = runtime->private_data;
453 params = prtd->params;
454
455 /* restore the PDC registers and enable the PDC */
456 ssc_writex(params->ssc->regs, params->pdc->xpr, prtd->pdc_xpr_save);
457 ssc_writex(params->ssc->regs, params->pdc->xcr, prtd->pdc_xcr_save);
458 ssc_writex(params->ssc->regs, params->pdc->xnpr, prtd->pdc_xnpr_save);
459 ssc_writex(params->ssc->regs, params->pdc->xncr, prtd->pdc_xncr_save);
460
461 ssc_writel(params->ssc->regs, PDC_PTCR, params->mask->pdc_enable);
462 return 0;
463}
464#else
465#define atmel_pcm_suspend NULL
466#define atmel_pcm_resume NULL
467#endif
468
469static struct snd_soc_platform_driver atmel_soc_platform = {
470 .ops = &atmel_pcm_ops,
471 .pcm_new = atmel_pcm_new,
472 .pcm_free = atmel_pcm_free_dma_buffers,
473 .suspend = atmel_pcm_suspend,
474 .resume = atmel_pcm_resume,
475};
476
477static int __devinit atmel_soc_platform_probe(struct platform_device *pdev)
478{
479 return snd_soc_register_platform(&pdev->dev, &atmel_soc_platform);
480}
481
482static int __devexit atmel_soc_platform_remove(struct platform_device *pdev)
483{
484 snd_soc_unregister_platform(&pdev->dev);
485 return 0;
486}
487
488static struct platform_driver atmel_pcm_driver = {
489 .driver = {
490 .name = "atmel-pcm-audio",
491 .owner = THIS_MODULE,
492 },
493
494 .probe = atmel_soc_platform_probe,
495 .remove = __devexit_p(atmel_soc_platform_remove),
496};
497
498static int __init snd_atmel_pcm_init(void)
499{
500 return platform_driver_register(&atmel_pcm_driver);
501}
502module_init(snd_atmel_pcm_init);
503
504static void __exit snd_atmel_pcm_exit(void)
505{
506 platform_driver_unregister(&atmel_pcm_driver);
507}
508module_exit(snd_atmel_pcm_exit);
509
510MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
511MODULE_DESCRIPTION("Atmel PCM module");
512MODULE_LICENSE("GPL");