1/*
2 * Power management for audio on multifunction CS5535 companion device
3 * Copyright (C) Jaya Kumar
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
18 *
19 */
20
21#include <linux/init.h>
22#include <linux/pci.h>
23#include <linux/delay.h>
24#include <sound/core.h>
25#include <sound/control.h>
26#include <sound/initval.h>
27#include <sound/asoundef.h>
28#include <sound/pcm.h>
29#include <sound/ac97_codec.h>
30#include "cs5535audio.h"
31
32static void snd_cs5535audio_stop_hardware(struct cs5535audio *cs5535au)
33{
34	/*
35	we depend on snd_ac97_suspend to tell the
36	AC97 codec to shutdown. the amd spec suggests
37	that the LNK_SHUTDOWN be done at the same time
38	that the codec power-down is issued. instead,
39	we do it just after rather than at the same
40	time. excluding codec specific build_ops->suspend
41	ac97 powerdown hits:
42	0x8000 EAPD
43	0x4000 Headphone amplifier
44	0x0300 ADC & DAC
45	0x0400 Analog Mixer powerdown (Vref on)
46	I am not sure if this is the best that we can do.
47	The remainder to be investigated are:
48	- analog mixer (vref off) 0x0800
49	- AC-link powerdown 0x1000
50	- codec internal clock 0x2000
51	*/
52
53	/* set LNK_SHUTDOWN to shutdown AC link */
54	cs_writel(cs5535au, ACC_CODEC_CNTL, ACC_CODEC_CNTL_LNK_SHUTDOWN);
55
56}
57
58static int snd_cs5535audio_suspend(struct device *dev)
59{
60	struct snd_card *card = dev_get_drvdata(dev);
61	struct cs5535audio *cs5535au = card->private_data;
62	int i;
63
64	snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
65	snd_pcm_suspend_all(cs5535au->pcm);
66	snd_ac97_suspend(cs5535au->ac97);
67	for (i = 0; i < NUM_CS5535AUDIO_DMAS; i++) {
68		struct cs5535audio_dma *dma = &cs5535au->dmas[i];
69		if (dma && dma->substream)
70			dma->saved_prd = dma->ops->read_prd(cs5535au);
71	}
72	/* save important regs, then disable aclink in hw */
73	snd_cs5535audio_stop_hardware(cs5535au);
74	return 0;
75}
76
77static int snd_cs5535audio_resume(struct device *dev)
78{
79	struct snd_card *card = dev_get_drvdata(dev);
80	struct cs5535audio *cs5535au = card->private_data;
81	u32 tmp;
82	int timeout;
83	int i;
84
85	/* set LNK_WRM_RST to reset AC link */
86	cs_writel(cs5535au, ACC_CODEC_CNTL, ACC_CODEC_CNTL_LNK_WRM_RST);
87
88	timeout = 50;
89	do {
90		tmp = cs_readl(cs5535au, ACC_CODEC_STATUS);
91		if (tmp & PRM_RDY_STS)
92			break;
93		udelay(1);
94	} while (--timeout);
95
96	if (!timeout)
97		dev_err(cs5535au->card->dev, "Failure getting AC Link ready\n");
98
99	/* set up rate regs, dma. actual initiation is done in trig */
100	for (i = 0; i < NUM_CS5535AUDIO_DMAS; i++) {
101		struct cs5535audio_dma *dma = &cs5535au->dmas[i];
102		if (dma && dma->substream) {
103			dma->substream->ops->prepare(dma->substream);
104			dma->ops->setup_prd(cs5535au, dma->saved_prd);
105		}
106	}
107
108	/* we depend on ac97 to perform the codec power up */
109	snd_ac97_resume(cs5535au->ac97);
110	snd_power_change_state(card, SNDRV_CTL_POWER_D0);
111
112	return 0;
113}
114
115SIMPLE_DEV_PM_OPS(snd_cs5535audio_pm, snd_cs5535audio_suspend, snd_cs5535audio_resume);
116