1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2009-2010 Nuvoton technology corporation.
5 * Wan ZongShun <mcuos.com@gmail.com>
8 #include <linux/init.h>
9 #include <linux/module.h>
10 #include <linux/slab.h>
11 #include <linux/device.h>
12 #include <linux/delay.h>
13 #include <linux/mutex.h>
14 #include <linux/suspend.h>
15 #include <sound/core.h>
16 #include <sound/pcm.h>
17 #include <sound/initval.h>
18 #include <sound/soc.h>
19 #include <linux/clk.h>
23 #include "nuc900-audio.h"
25 static DEFINE_MUTEX(ac97_mutex);
26 struct nuc900_audio *nuc900_ac97_data;
27 EXPORT_SYMBOL_GPL(nuc900_ac97_data);
29 static int nuc900_checkready(void)
31 struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
33 if (!(AUDIO_READ(nuc900_audio->mmio + ACTL_ACIS0) & CODEC_READY))
39 /* AC97 controller reads codec register */
40 static unsigned short nuc900_ac97_read(struct snd_ac97 *ac97,
43 struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
44 unsigned long timeout = 0x10000, val;
46 mutex_lock(&ac97_mutex);
48 val = nuc900_checkready();
50 dev_err(nuc900_audio->dev, "AC97 codec is not ready\n");
54 /* set the R_WB bit and write register index */
55 AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS1, R_WB | reg);
57 /* set the valid frame bit and valid slots */
58 val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
59 val |= (VALID_FRAME | SLOT1_VALID);
60 AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, val);
64 /* polling the AC_R_FINISH */
65 while (!(AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON) & AC_R_FINISH)
70 dev_err(nuc900_audio->dev, "AC97 read register time out !\n");
75 val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0) ;
77 AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, val);
79 if (AUDIO_READ(nuc900_audio->mmio + ACTL_ACIS1) >> 2 != reg) {
80 dev_err(nuc900_audio->dev,
81 "R_INDEX of REG_ACTL_ACIS1 not match!\n");
85 val = (AUDIO_READ(nuc900_audio->mmio + ACTL_ACIS2) & 0xFFFF);
88 mutex_unlock(&ac97_mutex);
92 /* AC97 controller writes to codec register */
93 static void nuc900_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
96 struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
97 unsigned long tmp, timeout = 0x10000;
99 mutex_lock(&ac97_mutex);
101 tmp = nuc900_checkready();
103 dev_err(nuc900_audio->dev, "AC97 codec is not ready\n");
105 /* clear the R_WB bit and write register index */
106 AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS1, reg);
108 /* write register value */
109 AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS2, val);
111 /* set the valid frame bit and valid slots */
112 tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
113 tmp |= SLOT1_VALID | SLOT2_VALID | VALID_FRAME;
114 AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp);
118 /* polling the AC_W_FINISH */
119 while ((AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON) & AC_W_FINISH)
124 dev_err(nuc900_audio->dev, "AC97 write register time out !\n");
126 tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
127 tmp &= ~(SLOT1_VALID | SLOT2_VALID);
128 AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp);
130 mutex_unlock(&ac97_mutex);
134 static void nuc900_ac97_warm_reset(struct snd_ac97 *ac97)
136 struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
139 mutex_lock(&ac97_mutex);
141 /* warm reset AC 97 */
142 val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON);
144 AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACCON, val);
148 val = nuc900_checkready();
150 dev_err(nuc900_audio->dev, "AC97 codec is not ready\n");
152 mutex_unlock(&ac97_mutex);
155 static void nuc900_ac97_cold_reset(struct snd_ac97 *ac97)
157 struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
160 mutex_lock(&ac97_mutex);
162 /* reset Audio Controller */
163 val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
164 val |= ACTL_RESET_BIT;
165 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
167 val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
168 val &= (~ACTL_RESET_BIT);
169 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
171 /* reset AC-link interface */
173 val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
175 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
177 val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
179 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
181 /* cold reset AC 97 */
182 val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON);
184 AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACCON, val);
186 val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON);
188 AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACCON, val);
192 mutex_unlock(&ac97_mutex);
196 /* AC97 controller operations */
197 static struct snd_ac97_bus_ops nuc900_ac97_ops = {
198 .read = nuc900_ac97_read,
199 .write = nuc900_ac97_write,
200 .reset = nuc900_ac97_cold_reset,
201 .warm_reset = nuc900_ac97_warm_reset,
204 static int nuc900_ac97_trigger(struct snd_pcm_substream *substream,
205 int cmd, struct snd_soc_dai *dai)
207 struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
209 unsigned long val, tmp;
214 case SNDRV_PCM_TRIGGER_START:
215 case SNDRV_PCM_TRIGGER_RESUME:
216 val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
217 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
218 tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
219 tmp |= (SLOT3_VALID | SLOT4_VALID | VALID_FRAME);
220 AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp);
222 tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_PSR);
223 tmp |= (P_DMA_END_IRQ | P_DMA_MIDDLE_IRQ);
224 AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, tmp);
227 tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_RSR);
228 tmp |= (R_DMA_END_IRQ | R_DMA_MIDDLE_IRQ);
230 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, tmp);
234 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
237 case SNDRV_PCM_TRIGGER_STOP:
238 case SNDRV_PCM_TRIGGER_SUSPEND:
239 val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
240 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
241 tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
242 tmp &= ~(SLOT3_VALID | SLOT4_VALID);
243 AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp);
245 AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, RESET_PRSR);
248 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, RESET_PRSR);
252 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
262 static int nuc900_ac97_probe(struct snd_soc_dai *dai)
264 struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
267 mutex_lock(&ac97_mutex);
269 /* enable unit clock */
270 clk_enable(nuc900_audio->clk);
272 /* enable audio controller and AC-link interface */
273 val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON);
274 val |= (IIS_AC_PIN_SEL | ACLINK_EN);
275 AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val);
277 mutex_unlock(&ac97_mutex);
282 static int nuc900_ac97_remove(struct snd_soc_dai *dai)
284 struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
286 clk_disable(nuc900_audio->clk);
290 static const struct snd_soc_dai_ops nuc900_ac97_dai_ops = {
291 .trigger = nuc900_ac97_trigger,
294 static struct snd_soc_dai_driver nuc900_ac97_dai = {
295 .probe = nuc900_ac97_probe,
296 .remove = nuc900_ac97_remove,
299 .rates = SNDRV_PCM_RATE_8000_48000,
300 .formats = SNDRV_PCM_FMTBIT_S16_LE,
305 .rates = SNDRV_PCM_RATE_8000_48000,
306 .formats = SNDRV_PCM_FMTBIT_S16_LE,
310 .ops = &nuc900_ac97_dai_ops,
313 static const struct snd_soc_component_driver nuc900_ac97_component = {
314 .name = "nuc900-ac97",
317 static int nuc900_ac97_drvprobe(struct platform_device *pdev)
319 struct nuc900_audio *nuc900_audio;
322 if (nuc900_ac97_data)
325 nuc900_audio = devm_kzalloc(&pdev->dev, sizeof(struct nuc900_audio),
330 spin_lock_init(&nuc900_audio->lock);
332 nuc900_audio->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
333 nuc900_audio->mmio = devm_ioremap_resource(&pdev->dev,
335 if (IS_ERR(nuc900_audio->mmio))
336 return PTR_ERR(nuc900_audio->mmio);
338 nuc900_audio->clk = devm_clk_get(&pdev->dev, NULL);
339 if (IS_ERR(nuc900_audio->clk)) {
340 ret = PTR_ERR(nuc900_audio->clk);
344 ret = platform_get_irq(pdev, 0);
347 nuc900_audio->irq_num = ret;
349 nuc900_ac97_data = nuc900_audio;
351 ret = snd_soc_set_ac97_ops(&nuc900_ac97_ops);
355 ret = devm_snd_soc_register_component(&pdev->dev, &nuc900_ac97_component,
356 &nuc900_ac97_dai, 1);
360 /* enbale ac97 multifunction pin */
361 mfp_set_groupg(nuc900_audio->dev, NULL);
366 snd_soc_set_ac97_ops(NULL);
370 static int nuc900_ac97_drvremove(struct platform_device *pdev)
372 nuc900_ac97_data = NULL;
373 snd_soc_set_ac97_ops(NULL);
378 static struct platform_driver nuc900_ac97_driver = {
380 .name = "nuc900-ac97",
382 .probe = nuc900_ac97_drvprobe,
383 .remove = nuc900_ac97_drvremove,
386 module_platform_driver(nuc900_ac97_driver);
388 MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
389 MODULE_DESCRIPTION("NUC900 AC97 SoC driver!");
390 MODULE_LICENSE("GPL");
391 MODULE_ALIAS("platform:nuc900-ac97");