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

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