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 
nuc900_checkready(void)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 */
nuc900_ac97_read(struct snd_ac97 * ac97,unsigned short reg)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 */
nuc900_ac97_write(struct snd_ac97 * ac97,unsigned short reg,unsigned short val)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 
nuc900_ac97_warm_reset(struct snd_ac97 * ac97)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 
nuc900_ac97_cold_reset(struct snd_ac97 * ac97)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 
nuc900_ac97_trigger(struct snd_pcm_substream * substream,int cmd,struct snd_soc_dai * dai)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 
nuc900_ac97_probe(struct snd_soc_dai * dai)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 
nuc900_ac97_remove(struct snd_soc_dai * dai)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 	.bus_control		= true,
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 
nuc900_ac97_drvprobe(struct platform_device * pdev)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 	ret = platform_get_irq(pdev, 0);
349 	if (ret < 0)
350 		goto out;
351 	nuc900_audio->irq_num = ret;
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 
nuc900_ac97_drvremove(struct platform_device * pdev)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 	},
388 	.probe		= nuc900_ac97_drvprobe,
389 	.remove		= nuc900_ac97_drvremove,
390 };
391 
392 module_platform_driver(nuc900_ac97_driver);
393 
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");
398