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/clk.h>
27 #include "nuc900-audio.h"
29 static DEFINE_MUTEX(ac97_mutex);
30 struct nuc900_audio *nuc900_ac97_data;
31 EXPORT_SYMBOL_GPL(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 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,
208 static int nuc900_ac97_trigger(struct snd_pcm_substream *substream,
209 int cmd, struct snd_soc_dai *dai)
211 struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
213 unsigned long val, tmp;
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);
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);
231 tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_RSR);
232 tmp |= (R_DMA_END_IRQ | R_DMA_MIDDLE_IRQ);
234 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, tmp);
238 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
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);
249 AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, RESET_PRSR);
252 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, RESET_PRSR);
256 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
266 static int nuc900_ac97_probe(struct snd_soc_dai *dai)
268 struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
271 mutex_lock(&ac97_mutex);
273 /* enable unit clock */
274 clk_enable(nuc900_audio->clk);
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);
281 mutex_unlock(&ac97_mutex);
286 static int nuc900_ac97_remove(struct snd_soc_dai *dai)
288 struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
290 clk_disable(nuc900_audio->clk);
294 static const struct snd_soc_dai_ops nuc900_ac97_dai_ops = {
295 .trigger = nuc900_ac97_trigger,
298 static struct snd_soc_dai_driver nuc900_ac97_dai = {
299 .probe = nuc900_ac97_probe,
300 .remove = nuc900_ac97_remove,
303 .rates = SNDRV_PCM_RATE_8000_48000,
304 .formats = SNDRV_PCM_FMTBIT_S16_LE,
309 .rates = SNDRV_PCM_RATE_8000_48000,
310 .formats = SNDRV_PCM_FMTBIT_S16_LE,
314 .ops = &nuc900_ac97_dai_ops,
317 static const struct snd_soc_component_driver nuc900_ac97_component = {
318 .name = "nuc900-ac97",
321 static int nuc900_ac97_drvprobe(struct platform_device *pdev)
323 struct nuc900_audio *nuc900_audio;
326 if (nuc900_ac97_data)
329 nuc900_audio = devm_kzalloc(&pdev->dev, sizeof(struct nuc900_audio),
334 spin_lock_init(&nuc900_audio->lock);
336 nuc900_audio->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
337 nuc900_audio->mmio = devm_ioremap_resource(&pdev->dev,
339 if (IS_ERR(nuc900_audio->mmio))
340 return PTR_ERR(nuc900_audio->mmio);
342 nuc900_audio->clk = devm_clk_get(&pdev->dev, NULL);
343 if (IS_ERR(nuc900_audio->clk)) {
344 ret = PTR_ERR(nuc900_audio->clk);
348 ret = platform_get_irq(pdev, 0);
351 nuc900_audio->irq_num = ret;
353 nuc900_ac97_data = nuc900_audio;
355 ret = snd_soc_set_ac97_ops(&nuc900_ac97_ops);
359 ret = snd_soc_register_component(&pdev->dev, &nuc900_ac97_component,
360 &nuc900_ac97_dai, 1);
364 /* enbale ac97 multifunction pin */
365 mfp_set_groupg(nuc900_audio->dev, NULL);
370 snd_soc_set_ac97_ops(NULL);
374 static int nuc900_ac97_drvremove(struct platform_device *pdev)
376 snd_soc_unregister_component(&pdev->dev);
378 nuc900_ac97_data = NULL;
379 snd_soc_set_ac97_ops(NULL);
384 static struct platform_driver nuc900_ac97_driver = {
386 .name = "nuc900-ac97",
388 .probe = nuc900_ac97_drvprobe,
389 .remove = nuc900_ac97_drvremove,
392 module_platform_driver(nuc900_ac97_driver);
394 MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
395 MODULE_DESCRIPTION("NUC900 AC97 SoC driver!");
396 MODULE_LICENSE("GPL");
397 MODULE_ALIAS("platform:nuc900-ac97");