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Linux/sound/soc/nuc900/nuc900-ac97.c

  1 /*
  2  * Copyright (c) 2009-2010 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/init.h>
 13 #include <linux/module.h>
 14 #include <linux/slab.h>
 15 #include <linux/device.h>
 16 #include <linux/delay.h>
 17 #include <linux/mutex.h>
 18 #include <linux/suspend.h>
 19 #include <sound/core.h>
 20 #include <sound/pcm.h>
 21 #include <sound/initval.h>
 22 #include <sound/soc.h>
 23 #include <linux/clk.h>
 24 
 25 #include <mach/mfp.h>
 26 
 27 #include "nuc900-audio.h"
 28 
 29 static DEFINE_MUTEX(ac97_mutex);
 30 struct nuc900_audio *nuc900_ac97_data;
 31 EXPORT_SYMBOL_GPL(nuc900_ac97_data);
 32 
 33 static int nuc900_checkready(void)
 34 {
 35         struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
 36 
 37         if (!(AUDIO_READ(nuc900_audio->mmio + ACTL_ACIS0) & CODEC_READY))
 38                 return -EPERM;
 39 
 40         return 0;
 41 }
 42 
 43 /* AC97 controller reads codec register */
 44 static unsigned short nuc900_ac97_read(struct snd_ac97 *ac97,
 45                                         unsigned short reg)
 46 {
 47         struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
 48         unsigned long timeout = 0x10000, val;
 49 
 50         mutex_lock(&ac97_mutex);
 51 
 52         val = nuc900_checkready();
 53         if (val) {
 54                 dev_err(nuc900_audio->dev, "AC97 codec is not ready\n");
 55                 goto out;
 56         }
 57 
 58         /* set the R_WB bit and write register index */
 59         AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS1, R_WB | reg);
 60 
 61         /* set the valid frame bit and valid slots */
 62         val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
 63         val |= (VALID_FRAME | SLOT1_VALID);
 64         AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, val);
 65 
 66         udelay(100);
 67 
 68         /* polling the AC_R_FINISH */
 69         while (!(AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON) & AC_R_FINISH)
 70                                                                 && timeout--)
 71                 mdelay(1);
 72 
 73         if (!timeout) {
 74                 dev_err(nuc900_audio->dev, "AC97 read register time out !\n");
 75                 val = -EPERM;
 76                 goto out;
 77         }
 78 
 79         val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0) ;
 80         val &= ~SLOT1_VALID;
 81         AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, val);
 82 
 83         if (AUDIO_READ(nuc900_audio->mmio + ACTL_ACIS1) >> 2 != reg) {
 84                 dev_err(nuc900_audio->dev,
 85                                 "R_INDEX of REG_ACTL_ACIS1 not match!\n");
 86         }
 87 
 88         udelay(100);
 89         val = (AUDIO_READ(nuc900_audio->mmio + ACTL_ACIS2) & 0xFFFF);
 90 
 91 out:
 92         mutex_unlock(&ac97_mutex);
 93         return val;
 94 }
 95 
 96 /* AC97 controller writes to codec register */
 97 static void nuc900_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
 98                                 unsigned short val)
 99 {
100         struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
101         unsigned long tmp, timeout = 0x10000;
102 
103         mutex_lock(&ac97_mutex);
104 
105         tmp = nuc900_checkready();
106         if (tmp)
107                 dev_err(nuc900_audio->dev, "AC97 codec is not ready\n");
108 
109         /* clear the R_WB bit and write register index */
110         AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS1, reg);
111 
112         /* write register value */
113         AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS2, val);
114 
115         /* set the valid frame bit and valid slots */
116         tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
117         tmp |= SLOT1_VALID | SLOT2_VALID | VALID_FRAME;
118         AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp);
119 
120         udelay(100);
121 
122         /* polling the AC_W_FINISH */
123         while ((AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON) & AC_W_FINISH)
124                                                                 && timeout--)
125                 mdelay(1);
126 
127         if (!timeout)
128                 dev_err(nuc900_audio->dev, "AC97 write register time out !\n");
129 
130         tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
131         tmp &= ~(SLOT1_VALID | SLOT2_VALID);
132         AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp);
133 
134         mutex_unlock(&ac97_mutex);
135 
136 }
137 
138 static void nuc900_ac97_warm_reset(struct snd_ac97 *ac97)
139 {
140         struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
141         unsigned long val;
142 
143         mutex_lock(&ac97_mutex);
144 
145         /* warm reset AC 97 */
146         val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON);
147         val |= AC_W_RES;
148         AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACCON, val);
149 
150         udelay(100);
151 
152         val = nuc900_checkready();
153         if (val)
154                 dev_err(nuc900_audio->dev, "AC97 codec is not ready\n");
155 
156         mutex_unlock(&ac97_mutex);
157 }
158 
159 static void nuc900_ac97_cold_reset(struct snd_ac97 *ac97)
160 {
161         struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
162         unsigned long val;
163 
164         mutex_lock(&ac97_mutex);
165 
166         /* reset Audio Controller */
167         val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
168         val |= ACTL_RESET_BIT;
169         AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
170 
171         val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
172         val &= (~ACTL_RESET_BIT);
173         AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
174 
175         /* reset AC-link interface */
176 
177         val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
178         val |= AC_RESET;
179         AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
180 
181         val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
182         val &= ~AC_RESET;
183         AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
184 
185         /* cold reset AC 97 */
186         val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON);
187         val |= AC_C_RES;
188         AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACCON, val);
189 
190         val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON);
191         val &= (~AC_C_RES);
192         AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACCON, val);
193 
194         udelay(100);
195 
196         mutex_unlock(&ac97_mutex);
197 
198 }
199 
200 /* AC97 controller operations */
201 static struct snd_ac97_bus_ops nuc900_ac97_ops = {
202         .read           = nuc900_ac97_read,
203         .write          = nuc900_ac97_write,
204         .reset          = nuc900_ac97_cold_reset,
205         .warm_reset     = nuc900_ac97_warm_reset,
206 };
207 
208 static int nuc900_ac97_trigger(struct snd_pcm_substream *substream,
209                                 int cmd, struct snd_soc_dai *dai)
210 {
211         struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
212         int ret;
213         unsigned long val, tmp;
214 
215         ret = 0;
216 
217         switch (cmd) {
218         case SNDRV_PCM_TRIGGER_START:
219         case SNDRV_PCM_TRIGGER_RESUME:
220                 val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
221                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
222                         tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
223                         tmp |= (SLOT3_VALID | SLOT4_VALID | VALID_FRAME);
224                         AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp);
225 
226                         tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_PSR);
227                         tmp |= (P_DMA_END_IRQ | P_DMA_MIDDLE_IRQ);
228                         AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, tmp);
229                         val |= AC_PLAY;
230                 } else {
231                         tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_RSR);
232                         tmp |= (R_DMA_END_IRQ | R_DMA_MIDDLE_IRQ);
233 
234                         AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, tmp);
235                         val |= AC_RECORD;
236                 }
237 
238                 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
239 
240                 break;
241         case SNDRV_PCM_TRIGGER_STOP:
242         case SNDRV_PCM_TRIGGER_SUSPEND:
243                 val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
244                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
245                         tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
246                         tmp &= ~(SLOT3_VALID | SLOT4_VALID);
247                         AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp);
248 
249                         AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, RESET_PRSR);
250                         val &= ~AC_PLAY;
251                 } else {
252                         AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, RESET_PRSR);
253                         val &= ~AC_RECORD;
254                 }
255 
256                 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
257 
258                 break;
259         default:
260                 ret = -EINVAL;
261         }
262 
263         return ret;
264 }
265 
266 static int nuc900_ac97_probe(struct snd_soc_dai *dai)
267 {
268         struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
269         unsigned long val;
270 
271         mutex_lock(&ac97_mutex);
272 
273         /* enable unit clock */
274         clk_enable(nuc900_audio->clk);
275 
276         /* enable audio controller and AC-link interface */
277         val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON);
278         val |= (IIS_AC_PIN_SEL | ACLINK_EN);
279         AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val);
280 
281         mutex_unlock(&ac97_mutex);
282 
283         return 0;
284 }
285 
286 static int nuc900_ac97_remove(struct snd_soc_dai *dai)
287 {
288         struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
289 
290         clk_disable(nuc900_audio->clk);
291         return 0;
292 }
293 
294 static const struct snd_soc_dai_ops nuc900_ac97_dai_ops = {
295         .trigger        = nuc900_ac97_trigger,
296 };
297 
298 static struct snd_soc_dai_driver nuc900_ac97_dai = {
299         .probe                  = nuc900_ac97_probe,
300         .remove                 = nuc900_ac97_remove,
301         .ac97_control           = 1,
302         .playback = {
303                 .rates          = SNDRV_PCM_RATE_8000_48000,
304                 .formats        = SNDRV_PCM_FMTBIT_S16_LE,
305                 .channels_min   = 1,
306                 .channels_max   = 2,
307         },
308         .capture = {
309                 .rates          = SNDRV_PCM_RATE_8000_48000,
310                 .formats        = SNDRV_PCM_FMTBIT_S16_LE,
311                 .channels_min   = 1,
312                 .channels_max   = 2,
313         },
314         .ops = &nuc900_ac97_dai_ops,
315 };
316 
317 static const struct snd_soc_component_driver nuc900_ac97_component = {
318         .name           = "nuc900-ac97",
319 };
320 
321 static int nuc900_ac97_drvprobe(struct platform_device *pdev)
322 {
323         struct nuc900_audio *nuc900_audio;
324         int ret;
325 
326         if (nuc900_ac97_data)
327                 return -EBUSY;
328 
329         nuc900_audio = devm_kzalloc(&pdev->dev, sizeof(struct nuc900_audio),
330                                     GFP_KERNEL);
331         if (!nuc900_audio)
332                 return -ENOMEM;
333 
334         spin_lock_init(&nuc900_audio->lock);
335 
336         nuc900_audio->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
337         nuc900_audio->mmio = devm_ioremap_resource(&pdev->dev,
338                                                    nuc900_audio->res);
339         if (IS_ERR(nuc900_audio->mmio))
340                 return PTR_ERR(nuc900_audio->mmio);
341 
342         nuc900_audio->clk = devm_clk_get(&pdev->dev, NULL);
343         if (IS_ERR(nuc900_audio->clk)) {
344                 ret = PTR_ERR(nuc900_audio->clk);
345                 goto out;
346         }
347 
348         nuc900_audio->irq_num = platform_get_irq(pdev, 0);
349         if (!nuc900_audio->irq_num) {
350                 ret = -EBUSY;
351                 goto out;
352         }
353 
354         nuc900_ac97_data = nuc900_audio;
355 
356         ret = snd_soc_set_ac97_ops(&nuc900_ac97_ops);
357         if (ret)
358                 goto out;
359 
360         ret = snd_soc_register_component(&pdev->dev, &nuc900_ac97_component,
361                                          &nuc900_ac97_dai, 1);
362         if (ret)
363                 goto out;
364 
365         /* enbale ac97 multifunction pin */
366         mfp_set_groupg(nuc900_audio->dev, NULL);
367 
368         return 0;
369 
370 out:
371         snd_soc_set_ac97_ops(NULL);
372         return ret;
373 }
374 
375 static int nuc900_ac97_drvremove(struct platform_device *pdev)
376 {
377         snd_soc_unregister_component(&pdev->dev);
378 
379         nuc900_ac97_data = NULL;
380         snd_soc_set_ac97_ops(NULL);
381 
382         return 0;
383 }
384 
385 static struct platform_driver nuc900_ac97_driver = {
386         .driver = {
387                 .name   = "nuc900-ac97",
388                 .owner  = THIS_MODULE,
389         },
390         .probe          = nuc900_ac97_drvprobe,
391         .remove         = nuc900_ac97_drvremove,
392 };
393 
394 module_platform_driver(nuc900_ac97_driver);
395 
396 MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
397 MODULE_DESCRIPTION("NUC900 AC97 SoC driver!");
398 MODULE_LICENSE("GPL");
399 MODULE_ALIAS("platform:nuc900-ac97");
400 

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