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19#include <linux/module.h>
20#include <linux/init.h>
21#include <linux/platform_device.h>
22#include <linux/slab.h>
23#include <linux/dma-mapping.h>
24#include <linux/atmel_pdc.h>
25
26#include <sound/core.h>
27#include <sound/pcm.h>
28#include <sound/pcm_params.h>
29#include <sound/soc.h>
30
31#include <mach/hardware.h>
32#include <mach/at91_ssc.h>
33
34#include "at91-pcm.h"
35
36#if 0
37#define DBG(x...) printk(KERN_INFO "at91-pcm: " x)
38#else
39#define DBG(x...)
40#endif
41
42static const struct snd_pcm_hardware at91_pcm_hardware = {
43 .info = SNDRV_PCM_INFO_MMAP |
44 SNDRV_PCM_INFO_MMAP_VALID |
45 SNDRV_PCM_INFO_INTERLEAVED |
46 SNDRV_PCM_INFO_PAUSE,
47 .formats = SNDRV_PCM_FMTBIT_S16_LE,
48 .period_bytes_min = 32,
49 .period_bytes_max = 8192,
50 .periods_min = 2,
51 .periods_max = 1024,
52 .buffer_bytes_max = 32 * 1024,
53};
54
55struct at91_runtime_data {
56 struct at91_pcm_dma_params *params;
57 dma_addr_t dma_buffer;
58 dma_addr_t dma_buffer_end;
59 size_t period_size;
60 dma_addr_t period_ptr;
61 u32 pdc_xpr_save;
62 u32 pdc_xcr_save;
63 u32 pdc_xnpr_save;
64 u32 pdc_xncr_save;
65};
66
67static void at91_pcm_dma_irq(u32 ssc_sr,
68 struct snd_pcm_substream *substream)
69{
70 struct at91_runtime_data *prtd = substream->runtime->private_data;
71 struct at91_pcm_dma_params *params = prtd->params;
72 static int count = 0;
73
74 count++;
75
76 if (ssc_sr & params->mask->ssc_endbuf) {
77
78 printk(KERN_WARNING
79 "at91-pcm: buffer %s on %s (SSC_SR=%#x, count=%d)\n",
80 substream->stream == SNDRV_PCM_STREAM_PLAYBACK
81 ? "underrun" : "overrun",
82 params->name, ssc_sr, count);
83
84
85 at91_ssc_write(params->ssc_base + ATMEL_PDC_PTCR, params->mask->pdc_disable);
86
87 prtd->period_ptr += prtd->period_size;
88 if (prtd->period_ptr >= prtd->dma_buffer_end) {
89 prtd->period_ptr = prtd->dma_buffer;
90 }
91
92 at91_ssc_write(params->ssc_base + params->pdc->xpr, prtd->period_ptr);
93 at91_ssc_write(params->ssc_base + params->pdc->xcr,
94 prtd->period_size / params->pdc_xfer_size);
95
96 at91_ssc_write(params->ssc_base + ATMEL_PDC_PTCR, params->mask->pdc_enable);
97 }
98
99 if (ssc_sr & params->mask->ssc_endx) {
100
101
102 prtd->period_ptr += prtd->period_size;
103 if (prtd->period_ptr >= prtd->dma_buffer_end) {
104 prtd->period_ptr = prtd->dma_buffer;
105 }
106 at91_ssc_write(params->ssc_base + params->pdc->xnpr,
107 prtd->period_ptr);
108 at91_ssc_write(params->ssc_base + params->pdc->xncr,
109 prtd->period_size / params->pdc_xfer_size);
110 }
111
112 snd_pcm_period_elapsed(substream);
113}
114
115static int at91_pcm_hw_params(struct snd_pcm_substream *substream,
116 struct snd_pcm_hw_params *params)
117{
118 struct snd_pcm_runtime *runtime = substream->runtime;
119 struct at91_runtime_data *prtd = runtime->private_data;
120 struct snd_soc_pcm_runtime *rtd = substream->private_data;
121
122
123
124
125 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
126 runtime->dma_bytes = params_buffer_bytes(params);
127
128 prtd->params = rtd->dai->cpu_dai->dma_data;
129 prtd->params->dma_intr_handler = at91_pcm_dma_irq;
130
131 prtd->dma_buffer = runtime->dma_addr;
132 prtd->dma_buffer_end = runtime->dma_addr + runtime->dma_bytes;
133 prtd->period_size = params_period_bytes(params);
134
135 DBG("hw_params: DMA for %s initialized (dma_bytes=%d, period_size=%d)\n",
136 prtd->params->name, runtime->dma_bytes, prtd->period_size);
137 return 0;
138}
139
140static int at91_pcm_hw_free(struct snd_pcm_substream *substream)
141{
142 struct at91_runtime_data *prtd = substream->runtime->private_data;
143 struct at91_pcm_dma_params *params = prtd->params;
144
145 if (params != NULL) {
146 at91_ssc_write(params->ssc_base + ATMEL_PDC_PTCR, params->mask->pdc_disable);
147 prtd->params->dma_intr_handler = NULL;
148 }
149
150 return 0;
151}
152
153static int at91_pcm_prepare(struct snd_pcm_substream *substream)
154{
155 struct at91_runtime_data *prtd = substream->runtime->private_data;
156 struct at91_pcm_dma_params *params = prtd->params;
157
158 at91_ssc_write(params->ssc_base + AT91_SSC_IDR,
159 params->mask->ssc_endx | params->mask->ssc_endbuf);
160
161 at91_ssc_write(params->ssc_base + ATMEL_PDC_PTCR, params->mask->pdc_disable);
162 return 0;
163}
164
165static int at91_pcm_trigger(struct snd_pcm_substream *substream,
166 int cmd)
167{
168 struct at91_runtime_data *prtd = substream->runtime->private_data;
169 struct at91_pcm_dma_params *params = prtd->params;
170 int ret = 0;
171
172 switch (cmd) {
173 case SNDRV_PCM_TRIGGER_START:
174 prtd->period_ptr = prtd->dma_buffer;
175
176 at91_ssc_write(params->ssc_base + params->pdc->xpr, prtd->period_ptr);
177 at91_ssc_write(params->ssc_base + params->pdc->xcr,
178 prtd->period_size / params->pdc_xfer_size);
179
180 prtd->period_ptr += prtd->period_size;
181 at91_ssc_write(params->ssc_base + params->pdc->xnpr, prtd->period_ptr);
182 at91_ssc_write(params->ssc_base + params->pdc->xncr,
183 prtd->period_size / params->pdc_xfer_size);
184
185 DBG("trigger: period_ptr=%lx, xpr=%lx, xcr=%ld, xnpr=%lx, xncr=%ld\n",
186 (unsigned long) prtd->period_ptr,
187 at91_ssc_read(params->ssc_base + params->pdc->xpr),
188 at91_ssc_read(params->ssc_base + params->pdc->xcr),
189 at91_ssc_read(params->ssc_base + params->pdc->xnpr),
190 at91_ssc_read(params->ssc_base + params->pdc->xncr));
191
192 at91_ssc_write(params->ssc_base + AT91_SSC_IER,
193 params->mask->ssc_endx | params->mask->ssc_endbuf);
194
195 at91_ssc_write(params->ssc_base + ATMEL_PDC_PTCR,
196 params->mask->pdc_enable);
197
198 DBG("sr=%lx imr=%lx\n",
199 at91_ssc_read(params->ssc_base + AT91_SSC_SR),
200 at91_ssc_read(params->ssc_base + AT91_SSC_IMR));
201 break;
202
203 case SNDRV_PCM_TRIGGER_STOP:
204 case SNDRV_PCM_TRIGGER_SUSPEND:
205 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
206 at91_ssc_write(params->ssc_base + ATMEL_PDC_PTCR, params->mask->pdc_disable);
207 break;
208
209 case SNDRV_PCM_TRIGGER_RESUME:
210 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
211 at91_ssc_write(params->ssc_base + ATMEL_PDC_PTCR, params->mask->pdc_enable);
212 break;
213
214 default:
215 ret = -EINVAL;
216 }
217
218 return ret;
219}
220
221static snd_pcm_uframes_t at91_pcm_pointer(
222 struct snd_pcm_substream *substream)
223{
224 struct snd_pcm_runtime *runtime = substream->runtime;
225 struct at91_runtime_data *prtd = runtime->private_data;
226 struct at91_pcm_dma_params *params = prtd->params;
227 dma_addr_t ptr;
228 snd_pcm_uframes_t x;
229
230 ptr = (dma_addr_t) at91_ssc_read(params->ssc_base + params->pdc->xpr);
231 x = bytes_to_frames(runtime, ptr - prtd->dma_buffer);
232
233 if (x == runtime->buffer_size)
234 x = 0;
235 return x;
236}
237
238static int at91_pcm_open(struct snd_pcm_substream *substream)
239{
240 struct snd_pcm_runtime *runtime = substream->runtime;
241 struct at91_runtime_data *prtd;
242 int ret = 0;
243
244 snd_soc_set_runtime_hwparams(substream, &at91_pcm_hardware);
245
246
247 ret = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
248 if (ret < 0)
249 goto out;
250
251 prtd = kzalloc(sizeof(struct at91_runtime_data), GFP_KERNEL);
252 if (prtd == NULL) {
253 ret = -ENOMEM;
254 goto out;
255 }
256 runtime->private_data = prtd;
257
258 out:
259 return ret;
260}
261
262static int at91_pcm_close(struct snd_pcm_substream *substream)
263{
264 struct at91_runtime_data *prtd = substream->runtime->private_data;
265
266 kfree(prtd);
267 return 0;
268}
269
270static int at91_pcm_mmap(struct snd_pcm_substream *substream,
271 struct vm_area_struct *vma)
272{
273 struct snd_pcm_runtime *runtime = substream->runtime;
274
275 return dma_mmap_writecombine(substream->pcm->card->dev, vma,
276 runtime->dma_area,
277 runtime->dma_addr,
278 runtime->dma_bytes);
279}
280
281struct snd_pcm_ops at91_pcm_ops = {
282 .open = at91_pcm_open,
283 .close = at91_pcm_close,
284 .ioctl = snd_pcm_lib_ioctl,
285 .hw_params = at91_pcm_hw_params,
286 .hw_free = at91_pcm_hw_free,
287 .prepare = at91_pcm_prepare,
288 .trigger = at91_pcm_trigger,
289 .pointer = at91_pcm_pointer,
290 .mmap = at91_pcm_mmap,
291};
292
293static int at91_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
294 int stream)
295{
296 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
297 struct snd_dma_buffer *buf = &substream->dma_buffer;
298 size_t size = at91_pcm_hardware.buffer_bytes_max;
299
300 buf->dev.type = SNDRV_DMA_TYPE_DEV;
301 buf->dev.dev = pcm->card->dev;
302 buf->private_data = NULL;
303 buf->area = dma_alloc_writecombine(pcm->card->dev, size,
304 &buf->addr, GFP_KERNEL);
305
306 DBG("preallocate_dma_buffer: area=%p, addr=%p, size=%d\n",
307 (void *) buf->area,
308 (void *) buf->addr,
309 size);
310
311 if (!buf->area)
312 return -ENOMEM;
313
314 buf->bytes = size;
315 return 0;
316}
317
318static u64 at91_pcm_dmamask = 0xffffffff;
319
320static int at91_pcm_new(struct snd_card *card,
321 struct snd_soc_dai *dai, struct snd_pcm *pcm)
322{
323 int ret = 0;
324
325 if (!card->dev->dma_mask)
326 card->dev->dma_mask = &at91_pcm_dmamask;
327 if (!card->dev->coherent_dma_mask)
328 card->dev->coherent_dma_mask = 0xffffffff;
329
330 if (dai->playback.channels_min) {
331 ret = at91_pcm_preallocate_dma_buffer(pcm,
332 SNDRV_PCM_STREAM_PLAYBACK);
333 if (ret)
334 goto out;
335 }
336
337 if (dai->capture.channels_min) {
338 ret = at91_pcm_preallocate_dma_buffer(pcm,
339 SNDRV_PCM_STREAM_CAPTURE);
340 if (ret)
341 goto out;
342 }
343 out:
344 return ret;
345}
346
347static void at91_pcm_free_dma_buffers(struct snd_pcm *pcm)
348{
349 struct snd_pcm_substream *substream;
350 struct snd_dma_buffer *buf;
351 int stream;
352
353 for (stream = 0; stream < 2; stream++) {
354 substream = pcm->streams[stream].substream;
355 if (!substream)
356 continue;
357
358 buf = &substream->dma_buffer;
359 if (!buf->area)
360 continue;
361
362 dma_free_writecombine(pcm->card->dev, buf->bytes,
363 buf->area, buf->addr);
364 buf->area = NULL;
365 }
366}
367
368#ifdef CONFIG_PM
369static int at91_pcm_suspend(struct platform_device *pdev,
370 struct snd_soc_dai *dai)
371{
372 struct snd_pcm_runtime *runtime = dai->runtime;
373 struct at91_runtime_data *prtd;
374 struct at91_pcm_dma_params *params;
375
376 if (!runtime)
377 return 0;
378
379 prtd = runtime->private_data;
380 params = prtd->params;
381
382
383
384 at91_ssc_write(params->ssc_base + ATMEL_PDC_PTCR, params->mask->pdc_disable);
385
386 prtd->pdc_xpr_save = at91_ssc_read(params->ssc_base + params->pdc->xpr);
387 prtd->pdc_xcr_save = at91_ssc_read(params->ssc_base + params->pdc->xcr);
388 prtd->pdc_xnpr_save = at91_ssc_read(params->ssc_base + params->pdc->xnpr);
389 prtd->pdc_xncr_save = at91_ssc_read(params->ssc_base + params->pdc->xncr);
390
391 return 0;
392}
393
394static int at91_pcm_resume(struct platform_device *pdev,
395 struct snd_soc_dai *dai)
396{
397 struct snd_pcm_runtime *runtime = dai->runtime;
398 struct at91_runtime_data *prtd;
399 struct at91_pcm_dma_params *params;
400
401 if (!runtime)
402 return 0;
403
404 prtd = runtime->private_data;
405 params = prtd->params;
406
407
408 at91_ssc_write(params->ssc_base + params->pdc->xpr, prtd->pdc_xpr_save);
409 at91_ssc_write(params->ssc_base + params->pdc->xcr, prtd->pdc_xcr_save);
410 at91_ssc_write(params->ssc_base + params->pdc->xnpr, prtd->pdc_xnpr_save);
411 at91_ssc_write(params->ssc_base + params->pdc->xncr, prtd->pdc_xncr_save);
412
413 at91_ssc_write(params->ssc_base + ATMEL_PDC_PTCR, params->mask->pdc_enable);
414 return 0;
415}
416#else
417#define at91_pcm_suspend NULL
418#define at91_pcm_resume NULL
419#endif
420
421struct snd_soc_platform at91_soc_platform = {
422 .name = "at91-audio",
423 .pcm_ops = &at91_pcm_ops,
424 .pcm_new = at91_pcm_new,
425 .pcm_free = at91_pcm_free_dma_buffers,
426 .suspend = at91_pcm_suspend,
427 .resume = at91_pcm_resume,
428};
429
430EXPORT_SYMBOL_GPL(at91_soc_platform);
431
432MODULE_AUTHOR("Frank Mandarino <fmandarino@endrelia.com>");
433MODULE_DESCRIPTION("Atmel AT91 PCM module");
434MODULE_LICENSE("GPL");
435
