2 * Copyright (c) 2009-2010 Nuvoton technology corporation.
4 * Wan ZongShun <mcuos.com@gmail.com>
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.
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/device.h>
24 #include <linux/clk.h>
28 #include "nuc900-audio.h"
30 static DEFINE_MUTEX(ac97_mutex);
31 struct nuc900_audio *nuc900_ac97_data;
33 static int nuc900_checkready(void)
35 struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
37 if (!(AUDIO_READ(nuc900_audio->mmio + ACTL_ACIS0) & CODEC_READY))
43 /* AC97 controller reads codec register */
44 static unsigned short nuc900_ac97_read(struct snd_ac97 *ac97,
47 struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
48 unsigned long timeout = 0x10000, val;
50 mutex_lock(&ac97_mutex);
52 val = nuc900_checkready();
54 dev_err(nuc900_audio->dev, "AC97 codec is not ready\n");
58 /* set the R_WB bit and write register index */
59 AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS1, R_WB | reg);
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);
68 /* polling the AC_R_FINISH */
69 while (!(AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON) & AC_R_FINISH)
74 dev_err(nuc900_audio->dev, "AC97 read register time out !\n");
79 val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0) ;
81 AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, val);
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");
89 val = (AUDIO_READ(nuc900_audio->mmio + ACTL_ACIS2) & 0xFFFF);
92 mutex_unlock(&ac97_mutex);
96 /* AC97 controller writes to codec register */
97 static void nuc900_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
100 struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
101 unsigned long tmp, timeout = 0x10000;
103 mutex_lock(&ac97_mutex);
105 tmp = nuc900_checkready();
107 dev_err(nuc900_audio->dev, "AC97 codec is not ready\n");
109 /* clear the R_WB bit and write register index */
110 AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS1, reg);
112 /* write register value */
113 AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS2, val);
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);
122 /* polling the AC_W_FINISH */
123 while ((AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON) & AC_W_FINISH)
128 dev_err(nuc900_audio->dev, "AC97 write register time out !\n");
130 tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
131 tmp &= ~(SLOT1_VALID | SLOT2_VALID);
132 AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp);
134 mutex_unlock(&ac97_mutex);
138 static void nuc900_ac97_warm_reset(struct snd_ac97 *ac97)
140 struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
143 mutex_lock(&ac97_mutex);
145 /* warm reset AC 97 */
146 val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON);
148 AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACCON, val);
152 val = nuc900_checkready();
154 dev_err(nuc900_audio->dev, "AC97 codec is not ready\n");
156 mutex_unlock(&ac97_mutex);
159 static void nuc900_ac97_cold_reset(struct snd_ac97 *ac97)
161 struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
164 mutex_lock(&ac97_mutex);
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);
171 val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
172 val &= (~ACTL_RESET_BIT);
173 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
175 /* reset AC-link interface */
177 val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
179 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
181 val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
183 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
185 /* cold reset AC 97 */
186 val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON);
188 AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACCON, val);
190 val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON);
192 AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACCON, val);
196 mutex_unlock(&ac97_mutex);
200 /* AC97 controller operations */
201 struct snd_ac97_bus_ops soc_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,
207 EXPORT_SYMBOL_GPL(soc_ac97_ops);
209 static int nuc900_ac97_trigger(struct snd_pcm_substream *substream,
210 int cmd, struct snd_soc_dai *dai)
212 struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
214 unsigned long val, tmp;
219 case SNDRV_PCM_TRIGGER_START:
220 case SNDRV_PCM_TRIGGER_RESUME:
221 val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
222 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
223 tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
224 tmp |= (SLOT3_VALID | SLOT4_VALID | VALID_FRAME);
225 AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp);
227 tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_PSR);
228 tmp |= (P_DMA_END_IRQ | P_DMA_MIDDLE_IRQ);
229 AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, tmp);
232 tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_RSR);
233 tmp |= (R_DMA_END_IRQ | R_DMA_MIDDLE_IRQ);
235 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, tmp);
239 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
242 case SNDRV_PCM_TRIGGER_STOP:
243 case SNDRV_PCM_TRIGGER_SUSPEND:
244 val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
245 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
246 tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
247 tmp &= ~(SLOT3_VALID | SLOT4_VALID);
248 AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp);
250 AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, RESET_PRSR);
253 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, RESET_PRSR);
257 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
267 static int nuc900_ac97_probe(struct platform_device *pdev,
268 struct snd_soc_dai *dai)
270 struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
273 mutex_lock(&ac97_mutex);
275 /* enable unit clock */
276 clk_enable(nuc900_audio->clk);
278 /* enable audio controller and AC-link interface */
279 val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON);
280 val |= (IIS_AC_PIN_SEL | ACLINK_EN);
281 AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val);
283 mutex_unlock(&ac97_mutex);
288 static void nuc900_ac97_remove(struct platform_device *pdev,
289 struct snd_soc_dai *dai)
291 struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
293 clk_disable(nuc900_audio->clk);
296 static struct snd_soc_dai_ops nuc900_ac97_dai_ops = {
297 .trigger = nuc900_ac97_trigger,
300 struct snd_soc_dai nuc900_ac97_dai = {
301 .name = "nuc900-ac97",
302 .probe = nuc900_ac97_probe,
303 .remove = nuc900_ac97_remove,
306 .rates = SNDRV_PCM_RATE_8000_48000,
307 .formats = SNDRV_PCM_FMTBIT_S16_LE,
312 .rates = SNDRV_PCM_RATE_8000_48000,
313 .formats = SNDRV_PCM_FMTBIT_S16_LE,
317 .ops = &nuc900_ac97_dai_ops,
319 EXPORT_SYMBOL_GPL(nuc900_ac97_dai);
321 static int __devinit nuc900_ac97_drvprobe(struct platform_device *pdev)
323 struct nuc900_audio *nuc900_audio;
326 if (nuc900_ac97_data)
329 nuc900_audio = kzalloc(sizeof(struct nuc900_audio), GFP_KERNEL);
333 spin_lock_init(&nuc900_audio->lock);
335 nuc900_audio->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
336 if (!nuc900_audio->res) {
341 if (!request_mem_region(nuc900_audio->res->start,
342 resource_size(nuc900_audio->res), pdev->name)) {
347 nuc900_audio->mmio = ioremap(nuc900_audio->res->start,
348 resource_size(nuc900_audio->res));
349 if (!nuc900_audio->mmio) {
354 nuc900_audio->clk = clk_get(&pdev->dev, NULL);
355 if (IS_ERR(nuc900_audio->clk)) {
356 ret = PTR_ERR(nuc900_audio->clk);
360 nuc900_audio->irq_num = platform_get_irq(pdev, 0);
361 if (!nuc900_audio->irq_num) {
366 nuc900_ac97_data = nuc900_audio;
368 nuc900_audio->dev = nuc900_ac97_dai.dev = &pdev->dev;
370 ret = snd_soc_register_dai(&nuc900_ac97_dai);
374 mfp_set_groupg(nuc900_audio->dev); /* enbale ac97 multifunction pin*/
379 clk_put(nuc900_audio->clk);
381 iounmap(nuc900_audio->mmio);
383 release_mem_region(nuc900_audio->res->start,
384 resource_size(nuc900_audio->res));
390 static int __devexit nuc900_ac97_drvremove(struct platform_device *pdev)
393 snd_soc_unregister_dai(&nuc900_ac97_dai);
395 clk_put(nuc900_ac97_data->clk);
396 iounmap(nuc900_ac97_data->mmio);
397 release_mem_region(nuc900_ac97_data->res->start,
398 resource_size(nuc900_ac97_data->res));
400 nuc900_ac97_data = NULL;
405 static struct platform_driver nuc900_ac97_driver = {
407 .name = "nuc900-audio",
408 .owner = THIS_MODULE,
410 .probe = nuc900_ac97_drvprobe,
411 .remove = __devexit_p(nuc900_ac97_drvremove),
414 static int __init nuc900_ac97_init(void)
416 return platform_driver_register(&nuc900_ac97_driver);
419 static void __exit nuc900_ac97_exit(void)
421 platform_driver_unregister(&nuc900_ac97_driver);
424 module_init(nuc900_ac97_init);
425 module_exit(nuc900_ac97_exit);
427 MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
428 MODULE_DESCRIPTION("NUC900 AC97 SoC driver!");
429 MODULE_LICENSE("GPL");
430 MODULE_ALIAS("platform:nuc900-ac97");