ASoC: nuc900: constify snd_pcm_ops structures
[muen/linux.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         .buffer_bytes_max       = 4*1024,
36         .period_bytes_min       = 1*1024,
37         .period_bytes_max       = 4*1024,
38         .periods_min            = 1,
39         .periods_max            = 1024,
40 };
41
42 static int nuc900_dma_hw_params(struct snd_pcm_substream *substream,
43         struct snd_pcm_hw_params *params)
44 {
45         return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
46 }
47
48 static void nuc900_update_dma_register(struct snd_pcm_substream *substream)
49 {
50         struct snd_pcm_runtime *runtime = substream->runtime;
51         struct nuc900_audio *nuc900_audio = runtime->private_data;
52         void __iomem *mmio_addr, *mmio_len;
53
54         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
55                 mmio_addr = nuc900_audio->mmio + ACTL_PDSTB;
56                 mmio_len = nuc900_audio->mmio + ACTL_PDST_LENGTH;
57         } else {
58                 mmio_addr = nuc900_audio->mmio + ACTL_RDSTB;
59                 mmio_len = nuc900_audio->mmio + ACTL_RDST_LENGTH;
60         }
61
62         AUDIO_WRITE(mmio_addr, runtime->dma_addr);
63         AUDIO_WRITE(mmio_len, runtime->dma_bytes);
64 }
65
66 static void nuc900_dma_start(struct snd_pcm_substream *substream)
67 {
68         struct snd_pcm_runtime *runtime = substream->runtime;
69         struct nuc900_audio *nuc900_audio = runtime->private_data;
70         unsigned long val;
71
72         val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON);
73         val |= (T_DMA_IRQ | R_DMA_IRQ);
74         AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val);
75 }
76
77 static void nuc900_dma_stop(struct snd_pcm_substream *substream)
78 {
79         struct snd_pcm_runtime *runtime = substream->runtime;
80         struct nuc900_audio *nuc900_audio = runtime->private_data;
81         unsigned long val;
82
83         val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON);
84         val &= ~(T_DMA_IRQ | R_DMA_IRQ);
85         AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val);
86 }
87
88 static irqreturn_t nuc900_dma_interrupt(int irq, void *dev_id)
89 {
90         struct snd_pcm_substream *substream = dev_id;
91         struct nuc900_audio *nuc900_audio = substream->runtime->private_data;
92         unsigned long val;
93
94         spin_lock(&nuc900_audio->lock);
95
96         val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON);
97
98         if (val & R_DMA_IRQ) {
99                 AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val | R_DMA_IRQ);
100
101                 val = AUDIO_READ(nuc900_audio->mmio + ACTL_RSR);
102
103                 if (val & R_DMA_MIDDLE_IRQ) {
104                         val |= R_DMA_MIDDLE_IRQ;
105                         AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, val);
106                 }
107
108                 if (val & R_DMA_END_IRQ) {
109                         val |= R_DMA_END_IRQ;
110                         AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, val);
111                 }
112         } else if (val & T_DMA_IRQ) {
113                 AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val | T_DMA_IRQ);
114
115                 val = AUDIO_READ(nuc900_audio->mmio + ACTL_PSR);
116
117                 if (val & P_DMA_MIDDLE_IRQ) {
118                         val |= P_DMA_MIDDLE_IRQ;
119                         AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, val);
120                 }
121
122                 if (val & P_DMA_END_IRQ) {
123                         val |= P_DMA_END_IRQ;
124                         AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, val);
125                 }
126         } else {
127                 dev_err(nuc900_audio->dev, "Wrong DMA interrupt status!\n");
128                 spin_unlock(&nuc900_audio->lock);
129                 return IRQ_HANDLED;
130         }
131
132         spin_unlock(&nuc900_audio->lock);
133
134         snd_pcm_period_elapsed(substream);
135
136         return IRQ_HANDLED;
137 }
138
139 static int nuc900_dma_hw_free(struct snd_pcm_substream *substream)
140 {
141         snd_pcm_lib_free_pages(substream);
142         return 0;
143 }
144
145 static int nuc900_dma_prepare(struct snd_pcm_substream *substream)
146 {
147         struct snd_pcm_runtime *runtime = substream->runtime;
148         struct nuc900_audio *nuc900_audio = runtime->private_data;
149         unsigned long flags, val;
150         int ret = 0;
151
152         spin_lock_irqsave(&nuc900_audio->lock, flags);
153
154         nuc900_update_dma_register(substream);
155
156         val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
157
158         switch (runtime->channels) {
159         case 1:
160                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
161                         val &= ~(PLAY_LEFT_CHNNEL | PLAY_RIGHT_CHNNEL);
162                         val |= PLAY_RIGHT_CHNNEL;
163                 } else {
164                         val &= ~(RECORD_LEFT_CHNNEL | RECORD_RIGHT_CHNNEL);
165                         val |= RECORD_RIGHT_CHNNEL;
166                 }
167                 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
168                 break;
169         case 2:
170                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
171                         val |= (PLAY_LEFT_CHNNEL | PLAY_RIGHT_CHNNEL);
172                 else
173                         val |= (RECORD_LEFT_CHNNEL | RECORD_RIGHT_CHNNEL);
174                 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
175                 break;
176         default:
177                 ret = -EINVAL;
178         }
179         spin_unlock_irqrestore(&nuc900_audio->lock, flags);
180         return ret;
181 }
182
183 static int nuc900_dma_trigger(struct snd_pcm_substream *substream, int cmd)
184 {
185         int ret = 0;
186
187         switch (cmd) {
188         case SNDRV_PCM_TRIGGER_START:
189         case SNDRV_PCM_TRIGGER_RESUME:
190                 nuc900_dma_start(substream);
191                 break;
192
193         case SNDRV_PCM_TRIGGER_STOP:
194         case SNDRV_PCM_TRIGGER_SUSPEND:
195                 nuc900_dma_stop(substream);
196                 break;
197
198         default:
199                 ret = -EINVAL;
200                 break;
201         }
202
203         return ret;
204 }
205
206 static int nuc900_dma_getposition(struct snd_pcm_substream *substream,
207                                         dma_addr_t *src, dma_addr_t *dst)
208 {
209         struct snd_pcm_runtime *runtime = substream->runtime;
210         struct nuc900_audio *nuc900_audio = runtime->private_data;
211
212         if (src != NULL)
213                 *src = AUDIO_READ(nuc900_audio->mmio + ACTL_PDSTC);
214
215         if (dst != NULL)
216                 *dst = AUDIO_READ(nuc900_audio->mmio + ACTL_RDSTC);
217
218         return 0;
219 }
220
221 static snd_pcm_uframes_t nuc900_dma_pointer(struct snd_pcm_substream *substream)
222 {
223         struct snd_pcm_runtime *runtime = substream->runtime;
224         dma_addr_t src, dst;
225         unsigned long res;
226
227         nuc900_dma_getposition(substream, &src, &dst);
228
229         if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
230                 res = dst - runtime->dma_addr;
231         else
232                 res = src - runtime->dma_addr;
233
234         return bytes_to_frames(substream->runtime, res);
235 }
236
237 static int nuc900_dma_open(struct snd_pcm_substream *substream)
238 {
239         struct snd_pcm_runtime *runtime = substream->runtime;
240         struct nuc900_audio *nuc900_audio;
241
242         snd_soc_set_runtime_hwparams(substream, &nuc900_pcm_hardware);
243
244         nuc900_audio = nuc900_ac97_data;
245
246         if (request_irq(nuc900_audio->irq_num, nuc900_dma_interrupt,
247                         0, "nuc900-dma", substream))
248                 return -EBUSY;
249
250         runtime->private_data = nuc900_audio;
251
252         return 0;
253 }
254
255 static int nuc900_dma_close(struct snd_pcm_substream *substream)
256 {
257         struct snd_pcm_runtime *runtime = substream->runtime;
258         struct nuc900_audio *nuc900_audio = runtime->private_data;
259
260         free_irq(nuc900_audio->irq_num, substream);
261
262         return 0;
263 }
264
265 static int nuc900_dma_mmap(struct snd_pcm_substream *substream,
266         struct vm_area_struct *vma)
267 {
268         struct snd_pcm_runtime *runtime = substream->runtime;
269
270         return dma_mmap_wc(substream->pcm->card->dev, vma, runtime->dma_area,
271                            runtime->dma_addr, runtime->dma_bytes);
272 }
273
274 static const struct snd_pcm_ops nuc900_dma_ops = {
275         .open           = nuc900_dma_open,
276         .close          = nuc900_dma_close,
277         .ioctl          = snd_pcm_lib_ioctl,
278         .hw_params      = nuc900_dma_hw_params,
279         .hw_free        = nuc900_dma_hw_free,
280         .prepare        = nuc900_dma_prepare,
281         .trigger        = nuc900_dma_trigger,
282         .pointer        = nuc900_dma_pointer,
283         .mmap           = nuc900_dma_mmap,
284 };
285
286 static int nuc900_dma_new(struct snd_soc_pcm_runtime *rtd)
287 {
288         struct snd_card *card = rtd->card->snd_card;
289         struct snd_pcm *pcm = rtd->pcm;
290         int ret;
291
292         ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
293         if (ret)
294                 return ret;
295
296         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
297                 card->dev, 4 * 1024, (4 * 1024) - 1);
298
299         return 0;
300 }
301
302 static const struct snd_soc_platform_driver nuc900_soc_platform = {
303         .ops            = &nuc900_dma_ops,
304         .pcm_new        = nuc900_dma_new,
305 };
306
307 static int nuc900_soc_platform_probe(struct platform_device *pdev)
308 {
309         return devm_snd_soc_register_platform(&pdev->dev, &nuc900_soc_platform);
310 }
311
312 static struct platform_driver nuc900_pcm_driver = {
313         .driver = {
314                         .name = "nuc900-pcm-audio",
315         },
316
317         .probe = nuc900_soc_platform_probe,
318 };
319
320 module_platform_driver(nuc900_pcm_driver);
321
322 MODULE_AUTHOR("Wan ZongShun, <mcuos.com@gmail.com>");
323 MODULE_DESCRIPTION("nuc900 Audio DMA module");
324 MODULE_LICENSE("GPL");