e46d5516e000c65e1c05894cb7d84076aab34d8e
[linux-2.6.git] / sound / soc / nuc900 / nuc900-pcm.c
1 /*
2  * Copyright (c) 2010 Nuvoton technology corporation.
3  *
4  * Wan ZongShun <mcuos.com@gmail.com>
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation;version 2 of the License.
9  *
10  */
11
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/io.h>
15 #include <linux/platform_device.h>
16 #include <linux/slab.h>
17 #include <linux/dma-mapping.h>
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 <mach/hardware.h>
25
26 #include "nuc900-audio.h"
27
28 static const struct snd_pcm_hardware nuc900_pcm_hardware = {
29         .info                   = SNDRV_PCM_INFO_INTERLEAVED |
30                                         SNDRV_PCM_INFO_BLOCK_TRANSFER |
31                                         SNDRV_PCM_INFO_MMAP |
32                                         SNDRV_PCM_INFO_MMAP_VALID |
33                                         SNDRV_PCM_INFO_PAUSE |
34                                         SNDRV_PCM_INFO_RESUME,
35         .formats                = SNDRV_PCM_FMTBIT_S16_LE,
36         .channels_min           = 1,
37         .channels_max           = 2,
38         .buffer_bytes_max       = 4*1024,
39         .period_bytes_min       = 1*1024,
40         .period_bytes_max       = 4*1024,
41         .periods_min            = 1,
42         .periods_max            = 1024,
43 };
44
45 static int nuc900_dma_hw_params(struct snd_pcm_substream *substream,
46         struct snd_pcm_hw_params *params)
47 {
48         struct snd_pcm_runtime *runtime = substream->runtime;
49         struct nuc900_audio *nuc900_audio = runtime->private_data;
50         unsigned long flags;
51         int ret = 0;
52
53         ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
54         if (ret < 0)
55                 return ret;
56
57         spin_lock_irqsave(&nuc900_audio->lock, flags);
58
59         nuc900_audio->substream = substream;
60         nuc900_audio->dma_addr[substream->stream] = runtime->dma_addr;
61         nuc900_audio->buffersize[substream->stream] =
62                                                 params_buffer_bytes(params);
63
64         spin_unlock_irqrestore(&nuc900_audio->lock, flags);
65
66         return ret;
67 }
68
69 static void nuc900_update_dma_register(struct snd_pcm_substream *substream,
70                                 dma_addr_t dma_addr, size_t count)
71 {
72         struct snd_pcm_runtime *runtime = substream->runtime;
73         struct nuc900_audio *nuc900_audio = runtime->private_data;
74         void __iomem *mmio_addr, *mmio_len;
75
76         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
77                 mmio_addr = nuc900_audio->mmio + ACTL_PDSTB;
78                 mmio_len = nuc900_audio->mmio + ACTL_PDST_LENGTH;
79         } else {
80                 mmio_addr = nuc900_audio->mmio + ACTL_RDSTB;
81                 mmio_len = nuc900_audio->mmio + ACTL_RDST_LENGTH;
82         }
83
84         AUDIO_WRITE(mmio_addr, dma_addr);
85         AUDIO_WRITE(mmio_len, count);
86 }
87
88 static void nuc900_dma_start(struct snd_pcm_substream *substream)
89 {
90         struct snd_pcm_runtime *runtime = substream->runtime;
91         struct nuc900_audio *nuc900_audio = runtime->private_data;
92         unsigned long val;
93
94         val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON);
95         val |= (T_DMA_IRQ | R_DMA_IRQ);
96         AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val);
97 }
98
99 static void nuc900_dma_stop(struct snd_pcm_substream *substream)
100 {
101         struct snd_pcm_runtime *runtime = substream->runtime;
102         struct nuc900_audio *nuc900_audio = runtime->private_data;
103         unsigned long val;
104
105         val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON);
106         val &= ~(T_DMA_IRQ | R_DMA_IRQ);
107         AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val);
108 }
109
110 static irqreturn_t nuc900_dma_interrupt(int irq, void *dev_id)
111 {
112         struct snd_pcm_substream *substream = dev_id;
113         struct nuc900_audio *nuc900_audio = substream->runtime->private_data;
114         unsigned long val;
115
116         spin_lock(&nuc900_audio->lock);
117
118         val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON);
119
120         if (val & R_DMA_IRQ) {
121                 AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val | R_DMA_IRQ);
122
123                 val = AUDIO_READ(nuc900_audio->mmio + ACTL_RSR);
124
125                 if (val & R_DMA_MIDDLE_IRQ) {
126                         val |= R_DMA_MIDDLE_IRQ;
127                         AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, val);
128                 }
129
130                 if (val & R_DMA_END_IRQ) {
131                         val |= R_DMA_END_IRQ;
132                         AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, val);
133                 }
134         } else if (val & T_DMA_IRQ) {
135                 AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val | T_DMA_IRQ);
136
137                 val = AUDIO_READ(nuc900_audio->mmio + ACTL_PSR);
138
139                 if (val & P_DMA_MIDDLE_IRQ) {
140                         val |= P_DMA_MIDDLE_IRQ;
141                         AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, val);
142                 }
143
144                 if (val & P_DMA_END_IRQ) {
145                         val |= P_DMA_END_IRQ;
146                         AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, val);
147                 }
148         } else {
149                 dev_err(nuc900_audio->dev, "Wrong DMA interrupt status!\n");
150                 spin_unlock(&nuc900_audio->lock);
151                 return IRQ_HANDLED;
152         }
153
154         spin_unlock(&nuc900_audio->lock);
155
156         snd_pcm_period_elapsed(substream);
157
158         return IRQ_HANDLED;
159 }
160
161 static int nuc900_dma_hw_free(struct snd_pcm_substream *substream)
162 {
163         snd_pcm_lib_free_pages(substream);
164         return 0;
165 }
166
167 static int nuc900_dma_prepare(struct snd_pcm_substream *substream)
168 {
169         struct snd_pcm_runtime *runtime = substream->runtime;
170         struct nuc900_audio *nuc900_audio = runtime->private_data;
171         unsigned long flags, val;
172         int ret = 0;
173
174         spin_lock_irqsave(&nuc900_audio->lock, flags);
175
176         nuc900_update_dma_register(substream,
177                                 nuc900_audio->dma_addr[substream->stream],
178                                 nuc900_audio->buffersize[substream->stream]);
179
180         val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
181
182         switch (runtime->channels) {
183         case 1:
184                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
185                         val &= ~(PLAY_LEFT_CHNNEL | PLAY_RIGHT_CHNNEL);
186                         val |= PLAY_RIGHT_CHNNEL;
187                 } else {
188                         val &= ~(RECORD_LEFT_CHNNEL | RECORD_RIGHT_CHNNEL);
189                         val |= RECORD_RIGHT_CHNNEL;
190                 }
191                 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
192                 break;
193         case 2:
194                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
195                         val |= (PLAY_LEFT_CHNNEL | PLAY_RIGHT_CHNNEL);
196                 else
197                         val |= (RECORD_LEFT_CHNNEL | RECORD_RIGHT_CHNNEL);
198                 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
199                 break;
200         default:
201                 ret = -EINVAL;
202         }
203         spin_unlock_irqrestore(&nuc900_audio->lock, flags);
204         return ret;
205 }
206
207 static int nuc900_dma_trigger(struct snd_pcm_substream *substream, int cmd)
208 {
209         int ret = 0;
210
211         switch (cmd) {
212         case SNDRV_PCM_TRIGGER_START:
213         case SNDRV_PCM_TRIGGER_RESUME:
214                 nuc900_dma_start(substream);
215                 break;
216
217         case SNDRV_PCM_TRIGGER_STOP:
218         case SNDRV_PCM_TRIGGER_SUSPEND:
219                 nuc900_dma_stop(substream);
220                 break;
221
222         default:
223                 ret = -EINVAL;
224                 break;
225         }
226
227         return ret;
228 }
229
230 int nuc900_dma_getposition(struct snd_pcm_substream *substream,
231                                         dma_addr_t *src, dma_addr_t *dst)
232 {
233         struct snd_pcm_runtime *runtime = substream->runtime;
234         struct nuc900_audio *nuc900_audio = runtime->private_data;
235
236         if (src != NULL)
237                 *src = AUDIO_READ(nuc900_audio->mmio + ACTL_PDSTC);
238
239         if (dst != NULL)
240                 *dst = AUDIO_READ(nuc900_audio->mmio + ACTL_RDSTC);
241
242         return 0;
243 }
244
245 static snd_pcm_uframes_t nuc900_dma_pointer(struct snd_pcm_substream *substream)
246 {
247         struct snd_pcm_runtime *runtime = substream->runtime;
248         dma_addr_t src, dst;
249         unsigned long res;
250
251         nuc900_dma_getposition(substream, &src, &dst);
252
253         if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
254                 res = dst - runtime->dma_addr;
255         else
256                 res = src - runtime->dma_addr;
257
258         return bytes_to_frames(substream->runtime, res);
259 }
260
261 static int nuc900_dma_open(struct snd_pcm_substream *substream)
262 {
263         struct snd_pcm_runtime *runtime = substream->runtime;
264         struct nuc900_audio *nuc900_audio;
265
266         snd_soc_set_runtime_hwparams(substream, &nuc900_pcm_hardware);
267
268         nuc900_audio = nuc900_ac97_data;
269
270         if (request_irq(nuc900_audio->irq_num, nuc900_dma_interrupt,
271                         IRQF_DISABLED, "nuc900-dma", substream))
272                 return -EBUSY;
273
274         runtime->private_data = nuc900_audio;
275
276         return 0;
277 }
278
279 static int nuc900_dma_close(struct snd_pcm_substream *substream)
280 {
281         struct snd_pcm_runtime *runtime = substream->runtime;
282         struct nuc900_audio *nuc900_audio = runtime->private_data;
283
284         free_irq(nuc900_audio->irq_num, substream);
285
286         return 0;
287 }
288
289 static int nuc900_dma_mmap(struct snd_pcm_substream *substream,
290         struct vm_area_struct *vma)
291 {
292         struct snd_pcm_runtime *runtime = substream->runtime;
293
294         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
295                                         runtime->dma_area,
296                                         runtime->dma_addr,
297                                         runtime->dma_bytes);
298 }
299
300 static struct snd_pcm_ops nuc900_dma_ops = {
301         .open           = nuc900_dma_open,
302         .close          = nuc900_dma_close,
303         .ioctl          = snd_pcm_lib_ioctl,
304         .hw_params      = nuc900_dma_hw_params,
305         .hw_free        = nuc900_dma_hw_free,
306         .prepare        = nuc900_dma_prepare,
307         .trigger        = nuc900_dma_trigger,
308         .pointer        = nuc900_dma_pointer,
309         .mmap           = nuc900_dma_mmap,
310 };
311
312 static void nuc900_dma_free_dma_buffers(struct snd_pcm *pcm)
313 {
314         snd_pcm_lib_preallocate_free_for_all(pcm);
315 }
316
317 static u64 nuc900_pcm_dmamask = DMA_BIT_MASK(32);
318 static int nuc900_dma_new(struct snd_soc_pcm_runtime *rtd)
319 {
320         struct snd_card *card = rtd->card->snd_card;
321         struct snd_pcm *pcm = rtd->pcm;
322
323         if (!card->dev->dma_mask)
324                 card->dev->dma_mask = &nuc900_pcm_dmamask;
325         if (!card->dev->coherent_dma_mask)
326                 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
327
328         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
329                 card->dev, 4 * 1024, (4 * 1024) - 1);
330
331         return 0;
332 }
333
334 static struct snd_soc_platform_driver nuc900_soc_platform = {
335         .ops            = &nuc900_dma_ops,
336         .pcm_new        = nuc900_dma_new,
337         .pcm_free       = nuc900_dma_free_dma_buffers,
338 };
339
340 static int __devinit nuc900_soc_platform_probe(struct platform_device *pdev)
341 {
342         return snd_soc_register_platform(&pdev->dev, &nuc900_soc_platform);
343 }
344
345 static int __devexit nuc900_soc_platform_remove(struct platform_device *pdev)
346 {
347         snd_soc_unregister_platform(&pdev->dev);
348         return 0;
349 }
350
351 static struct platform_driver nuc900_pcm_driver = {
352         .driver = {
353                         .name = "nuc900-pcm-audio",
354                         .owner = THIS_MODULE,
355         },
356
357         .probe = nuc900_soc_platform_probe,
358         .remove = __devexit_p(nuc900_soc_platform_remove),
359 };
360
361 static int __init nuc900_pcm_init(void)
362 {
363         return platform_driver_register(&nuc900_pcm_driver);
364 }
365 module_init(nuc900_pcm_init);
366
367 static void __exit nuc900_pcm_exit(void)
368 {
369         platform_driver_unregister(&nuc900_pcm_driver);
370 }
371 module_exit(nuc900_pcm_exit);
372
373 MODULE_AUTHOR("Wan ZongShun, <mcuos.com@gmail.com>");
374 MODULE_DESCRIPTION("nuc900 Audio DMA module");
375 MODULE_LICENSE("GPL");