1/*
2 * linux/sound/pxa2xx-ac97.c -- AC97 support for the Intel PXA2xx chip.
3 *
4 * Author:	Nicolas Pitre
5 * Created:	Dec 02, 2004
6 * Copyright:	MontaVista Software Inc.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13#include <linux/init.h>
14#include <linux/io.h>
15#include <linux/module.h>
16#include <linux/platform_device.h>
17#include <linux/dmaengine.h>
18#include <linux/dma/pxa-dma.h>
19
20#include <sound/core.h>
21#include <sound/pcm.h>
22#include <sound/ac97_codec.h>
23#include <sound/initval.h>
24#include <sound/pxa2xx-lib.h>
25#include <sound/dmaengine_pcm.h>
26
27#include <mach/regs-ac97.h>
28#include <mach/audio.h>
29
30#include "pxa2xx-pcm.h"
31
32static void pxa2xx_ac97_reset(struct snd_ac97 *ac97)
33{
34	if (!pxa2xx_ac97_try_cold_reset(ac97)) {
35		pxa2xx_ac97_try_warm_reset(ac97);
36	}
37
38	pxa2xx_ac97_finish_reset(ac97);
39}
40
41static struct snd_ac97_bus_ops pxa2xx_ac97_ops = {
42	.read	= pxa2xx_ac97_read,
43	.write	= pxa2xx_ac97_write,
44	.reset	= pxa2xx_ac97_reset,
45};
46
47static struct pxad_param pxa2xx_ac97_pcm_out_req = {
48	.prio = PXAD_PRIO_LOWEST,
49	.drcmr = 12,
50};
51
52static struct snd_dmaengine_dai_dma_data pxa2xx_ac97_pcm_out = {
53	.addr		= __PREG(PCDR),
54	.addr_width	= DMA_SLAVE_BUSWIDTH_4_BYTES,
55	.maxburst	= 32,
56	.filter_data	= &pxa2xx_ac97_pcm_out_req,
57};
58
59static struct pxad_param pxa2xx_ac97_pcm_in_req = {
60	.prio = PXAD_PRIO_LOWEST,
61	.drcmr = 11,
62};
63
64static struct snd_dmaengine_dai_dma_data pxa2xx_ac97_pcm_in = {
65	.addr		= __PREG(PCDR),
66	.addr_width	= DMA_SLAVE_BUSWIDTH_4_BYTES,
67	.maxburst	= 32,
68	.filter_data	= &pxa2xx_ac97_pcm_in_req,
69};
70
71static struct snd_pcm *pxa2xx_ac97_pcm;
72static struct snd_ac97 *pxa2xx_ac97_ac97;
73
74static int pxa2xx_ac97_pcm_startup(struct snd_pcm_substream *substream)
75{
76	struct snd_pcm_runtime *runtime = substream->runtime;
77	pxa2xx_audio_ops_t *platform_ops;
78	int r;
79
80	runtime->hw.channels_min = 2;
81	runtime->hw.channels_max = 2;
82
83	r = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
84	    AC97_RATES_FRONT_DAC : AC97_RATES_ADC;
85	runtime->hw.rates = pxa2xx_ac97_ac97->rates[r];
86	snd_pcm_limit_hw_rates(runtime);
87
88       	platform_ops = substream->pcm->card->dev->platform_data;
89	if (platform_ops && platform_ops->startup)
90		return platform_ops->startup(substream, platform_ops->priv);
91	else
92		return 0;
93}
94
95static void pxa2xx_ac97_pcm_shutdown(struct snd_pcm_substream *substream)
96{
97	pxa2xx_audio_ops_t *platform_ops;
98
99       	platform_ops = substream->pcm->card->dev->platform_data;
100	if (platform_ops && platform_ops->shutdown)
101		platform_ops->shutdown(substream, platform_ops->priv);
102}
103
104static int pxa2xx_ac97_pcm_prepare(struct snd_pcm_substream *substream)
105{
106	struct snd_pcm_runtime *runtime = substream->runtime;
107	int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
108		  AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
109	return snd_ac97_set_rate(pxa2xx_ac97_ac97, reg, runtime->rate);
110}
111
112static struct pxa2xx_pcm_client pxa2xx_ac97_pcm_client = {
113	.playback_params	= &pxa2xx_ac97_pcm_out,
114	.capture_params		= &pxa2xx_ac97_pcm_in,
115	.startup		= pxa2xx_ac97_pcm_startup,
116	.shutdown		= pxa2xx_ac97_pcm_shutdown,
117	.prepare		= pxa2xx_ac97_pcm_prepare,
118};
119
120#ifdef CONFIG_PM_SLEEP
121
122static int pxa2xx_ac97_do_suspend(struct snd_card *card)
123{
124	pxa2xx_audio_ops_t *platform_ops = card->dev->platform_data;
125
126	snd_power_change_state(card, SNDRV_CTL_POWER_D3cold);
127	snd_pcm_suspend_all(pxa2xx_ac97_pcm);
128	snd_ac97_suspend(pxa2xx_ac97_ac97);
129	if (platform_ops && platform_ops->suspend)
130		platform_ops->suspend(platform_ops->priv);
131
132	return pxa2xx_ac97_hw_suspend();
133}
134
135static int pxa2xx_ac97_do_resume(struct snd_card *card)
136{
137	pxa2xx_audio_ops_t *platform_ops = card->dev->platform_data;
138	int rc;
139
140	rc = pxa2xx_ac97_hw_resume();
141	if (rc)
142		return rc;
143
144	if (platform_ops && platform_ops->resume)
145		platform_ops->resume(platform_ops->priv);
146	snd_ac97_resume(pxa2xx_ac97_ac97);
147	snd_power_change_state(card, SNDRV_CTL_POWER_D0);
148
149	return 0;
150}
151
152static int pxa2xx_ac97_suspend(struct device *dev)
153{
154	struct snd_card *card = dev_get_drvdata(dev);
155	int ret = 0;
156
157	if (card)
158		ret = pxa2xx_ac97_do_suspend(card);
159
160	return ret;
161}
162
163static int pxa2xx_ac97_resume(struct device *dev)
164{
165	struct snd_card *card = dev_get_drvdata(dev);
166	int ret = 0;
167
168	if (card)
169		ret = pxa2xx_ac97_do_resume(card);
170
171	return ret;
172}
173
174static SIMPLE_DEV_PM_OPS(pxa2xx_ac97_pm_ops, pxa2xx_ac97_suspend, pxa2xx_ac97_resume);
175#endif
176
177static int pxa2xx_ac97_probe(struct platform_device *dev)
178{
179	struct snd_card *card;
180	struct snd_ac97_bus *ac97_bus;
181	struct snd_ac97_template ac97_template;
182	int ret;
183	pxa2xx_audio_ops_t *pdata = dev->dev.platform_data;
184
185	if (dev->id >= 0) {
186		dev_err(&dev->dev, "PXA2xx has only one AC97 port.\n");
187		ret = -ENXIO;
188		goto err_dev;
189	}
190
191	ret = snd_card_new(&dev->dev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
192			   THIS_MODULE, 0, &card);
193	if (ret < 0)
194		goto err;
195
196	strlcpy(card->driver, dev->dev.driver->name, sizeof(card->driver));
197
198	ret = pxa2xx_pcm_new(card, &pxa2xx_ac97_pcm_client, &pxa2xx_ac97_pcm);
199	if (ret)
200		goto err;
201
202	ret = pxa2xx_ac97_hw_probe(dev);
203	if (ret)
204		goto err;
205
206	ret = snd_ac97_bus(card, 0, &pxa2xx_ac97_ops, NULL, &ac97_bus);
207	if (ret)
208		goto err_remove;
209	memset(&ac97_template, 0, sizeof(ac97_template));
210	ret = snd_ac97_mixer(ac97_bus, &ac97_template, &pxa2xx_ac97_ac97);
211	if (ret)
212		goto err_remove;
213
214	snprintf(card->shortname, sizeof(card->shortname),
215		 "%s", snd_ac97_get_short_name(pxa2xx_ac97_ac97));
216	snprintf(card->longname, sizeof(card->longname),
217		 "%s (%s)", dev->dev.driver->name, card->mixername);
218
219	if (pdata && pdata->codec_pdata[0])
220		snd_ac97_dev_add_pdata(ac97_bus->codec[0], pdata->codec_pdata[0]);
221	ret = snd_card_register(card);
222	if (ret == 0) {
223		platform_set_drvdata(dev, card);
224		return 0;
225	}
226
227err_remove:
228	pxa2xx_ac97_hw_remove(dev);
229err:
230	if (card)
231		snd_card_free(card);
232err_dev:
233	return ret;
234}
235
236static int pxa2xx_ac97_remove(struct platform_device *dev)
237{
238	struct snd_card *card = platform_get_drvdata(dev);
239
240	if (card) {
241		snd_card_free(card);
242		pxa2xx_ac97_hw_remove(dev);
243	}
244
245	return 0;
246}
247
248static struct platform_driver pxa2xx_ac97_driver = {
249	.probe		= pxa2xx_ac97_probe,
250	.remove		= pxa2xx_ac97_remove,
251	.driver		= {
252		.name	= "pxa2xx-ac97",
253#ifdef CONFIG_PM_SLEEP
254		.pm	= &pxa2xx_ac97_pm_ops,
255#endif
256	},
257};
258
259module_platform_driver(pxa2xx_ac97_driver);
260
261MODULE_AUTHOR("Nicolas Pitre");
262MODULE_DESCRIPTION("AC97 driver for the Intel PXA2xx chip");
263MODULE_LICENSE("GPL");
264MODULE_ALIAS("platform:pxa2xx-ac97");
265