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
29static DEFINE_MUTEX(ac97_mutex);
30struct nuc900_audio *nuc900_ac97_data;
31EXPORT_SYMBOL_GPL(nuc900_ac97_data);
32
33static 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 */
44static 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
91out:
92	mutex_unlock(&ac97_mutex);
93	return val;
94}
95
96/* AC97 controller writes to codec register */
97static 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
138static 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
159static 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 */
201static 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
208static 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
266static 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
286static 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
294static const struct snd_soc_dai_ops nuc900_ac97_dai_ops = {
295	.trigger	= nuc900_ac97_trigger,
296};
297
298static 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
317static const struct snd_soc_component_driver nuc900_ac97_component = {
318	.name		= "nuc900-ac97",
319};
320
321static 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	nuc900_audio->irq_num = platform_get_irq(pdev, 0);
349	if (!nuc900_audio->irq_num) {
350		ret = -EBUSY;
351		goto out;
352	}
353
354	nuc900_ac97_data = nuc900_audio;
355
356	ret = snd_soc_set_ac97_ops(&nuc900_ac97_ops);
357	if (ret)
358		goto out;
359
360	ret = snd_soc_register_component(&pdev->dev, &nuc900_ac97_component,
361					 &nuc900_ac97_dai, 1);
362	if (ret)
363		goto out;
364
365	/* enbale ac97 multifunction pin */
366	mfp_set_groupg(nuc900_audio->dev, NULL);
367
368	return 0;
369
370out:
371	snd_soc_set_ac97_ops(NULL);
372	return ret;
373}
374
375static int nuc900_ac97_drvremove(struct platform_device *pdev)
376{
377	snd_soc_unregister_component(&pdev->dev);
378
379	nuc900_ac97_data = NULL;
380	snd_soc_set_ac97_ops(NULL);
381
382	return 0;
383}
384
385static struct platform_driver nuc900_ac97_driver = {
386	.driver	= {
387		.name	= "nuc900-ac97",
388	},
389	.probe		= nuc900_ac97_drvprobe,
390	.remove		= nuc900_ac97_drvremove,
391};
392
393module_platform_driver(nuc900_ac97_driver);
394
395MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
396MODULE_DESCRIPTION("NUC900 AC97 SoC driver!");
397MODULE_LICENSE("GPL");
398MODULE_ALIAS("platform:nuc900-ac97");
399