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498 lines
12 KiB
498 lines
12 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Au12x0/Au1550 PSC ALSA ASoC audio support. |
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* |
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* (c) 2007-2009 MSC Vertriebsges.m.b.H., |
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* Manuel Lauss <[email protected]> |
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* |
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* Au1xxx-PSC AC97 glue. |
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*/ |
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#include <linux/init.h> |
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#include <linux/module.h> |
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#include <linux/slab.h> |
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#include <linux/device.h> |
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#include <linux/delay.h> |
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#include <linux/mutex.h> |
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#include <linux/suspend.h> |
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#include <sound/core.h> |
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#include <sound/pcm.h> |
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#include <sound/initval.h> |
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#include <sound/soc.h> |
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#include <asm/mach-au1x00/au1000.h> |
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#include <asm/mach-au1x00/au1xxx_psc.h> |
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#include "psc.h" |
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/* how often to retry failed codec register reads/writes */ |
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#define AC97_RW_RETRIES 5 |
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#define AC97_DIR \ |
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(SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE) |
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#define AC97_RATES \ |
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SNDRV_PCM_RATE_8000_48000 |
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#define AC97_FMTS \ |
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(SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3BE) |
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#define AC97PCR_START(stype) \ |
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((stype) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_AC97PCR_TS : PSC_AC97PCR_RS) |
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#define AC97PCR_STOP(stype) \ |
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((stype) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_AC97PCR_TP : PSC_AC97PCR_RP) |
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#define AC97PCR_CLRFIFO(stype) \ |
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((stype) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_AC97PCR_TC : PSC_AC97PCR_RC) |
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#define AC97STAT_BUSY(stype) \ |
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((stype) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_AC97STAT_TB : PSC_AC97STAT_RB) |
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/* instance data. There can be only one, MacLeod!!!! */ |
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static struct au1xpsc_audio_data *au1xpsc_ac97_workdata; |
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#if 0 |
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|
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/* this could theoretically work, but ac97->bus->card->private_data can be NULL |
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* when snd_ac97_mixer() is called; I don't know if the rest further down the |
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* chain are always valid either. |
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*/ |
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static inline struct au1xpsc_audio_data *ac97_to_pscdata(struct snd_ac97 *x) |
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{ |
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struct snd_soc_card *c = x->bus->card->private_data; |
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return snd_soc_dai_get_drvdata(c->asoc_rtd_to_cpu(rtd, 0)); |
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} |
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#else |
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#define ac97_to_pscdata(x) au1xpsc_ac97_workdata |
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#endif |
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/* AC97 controller reads codec register */ |
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static unsigned short au1xpsc_ac97_read(struct snd_ac97 *ac97, |
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unsigned short reg) |
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{ |
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struct au1xpsc_audio_data *pscdata = ac97_to_pscdata(ac97); |
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unsigned short retry, tmo; |
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unsigned long data; |
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__raw_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata)); |
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wmb(); /* drain writebuffer */ |
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retry = AC97_RW_RETRIES; |
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do { |
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mutex_lock(&pscdata->lock); |
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__raw_writel(PSC_AC97CDC_RD | PSC_AC97CDC_INDX(reg), |
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AC97_CDC(pscdata)); |
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wmb(); /* drain writebuffer */ |
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tmo = 20; |
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do { |
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udelay(21); |
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if (__raw_readl(AC97_EVNT(pscdata)) & PSC_AC97EVNT_CD) |
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break; |
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} while (--tmo); |
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data = __raw_readl(AC97_CDC(pscdata)); |
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__raw_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata)); |
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wmb(); /* drain writebuffer */ |
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mutex_unlock(&pscdata->lock); |
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if (reg != ((data >> 16) & 0x7f)) |
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tmo = 1; /* wrong register, try again */ |
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} while (--retry && !tmo); |
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return retry ? data & 0xffff : 0xffff; |
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} |
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/* AC97 controller writes to codec register */ |
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static void au1xpsc_ac97_write(struct snd_ac97 *ac97, unsigned short reg, |
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unsigned short val) |
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{ |
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struct au1xpsc_audio_data *pscdata = ac97_to_pscdata(ac97); |
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unsigned int tmo, retry; |
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__raw_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata)); |
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wmb(); /* drain writebuffer */ |
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retry = AC97_RW_RETRIES; |
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do { |
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mutex_lock(&pscdata->lock); |
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__raw_writel(PSC_AC97CDC_INDX(reg) | (val & 0xffff), |
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AC97_CDC(pscdata)); |
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wmb(); /* drain writebuffer */ |
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tmo = 20; |
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do { |
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udelay(21); |
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if (__raw_readl(AC97_EVNT(pscdata)) & PSC_AC97EVNT_CD) |
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break; |
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} while (--tmo); |
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__raw_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata)); |
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wmb(); /* drain writebuffer */ |
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mutex_unlock(&pscdata->lock); |
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} while (--retry && !tmo); |
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} |
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/* AC97 controller asserts a warm reset */ |
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static void au1xpsc_ac97_warm_reset(struct snd_ac97 *ac97) |
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{ |
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struct au1xpsc_audio_data *pscdata = ac97_to_pscdata(ac97); |
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__raw_writel(PSC_AC97RST_SNC, AC97_RST(pscdata)); |
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wmb(); /* drain writebuffer */ |
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msleep(10); |
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__raw_writel(0, AC97_RST(pscdata)); |
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wmb(); /* drain writebuffer */ |
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} |
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static void au1xpsc_ac97_cold_reset(struct snd_ac97 *ac97) |
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{ |
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struct au1xpsc_audio_data *pscdata = ac97_to_pscdata(ac97); |
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int i; |
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/* disable PSC during cold reset */ |
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__raw_writel(0, AC97_CFG(au1xpsc_ac97_workdata)); |
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wmb(); /* drain writebuffer */ |
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__raw_writel(PSC_CTRL_DISABLE, PSC_CTRL(pscdata)); |
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wmb(); /* drain writebuffer */ |
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/* issue cold reset */ |
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__raw_writel(PSC_AC97RST_RST, AC97_RST(pscdata)); |
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wmb(); /* drain writebuffer */ |
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msleep(500); |
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__raw_writel(0, AC97_RST(pscdata)); |
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wmb(); /* drain writebuffer */ |
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/* enable PSC */ |
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__raw_writel(PSC_CTRL_ENABLE, PSC_CTRL(pscdata)); |
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wmb(); /* drain writebuffer */ |
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/* wait for PSC to indicate it's ready */ |
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i = 1000; |
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while (!((__raw_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_SR)) && (--i)) |
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msleep(1); |
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if (i == 0) { |
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printk(KERN_ERR "au1xpsc-ac97: PSC not ready!\n"); |
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return; |
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} |
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/* enable the ac97 function */ |
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__raw_writel(pscdata->cfg | PSC_AC97CFG_DE_ENABLE, AC97_CFG(pscdata)); |
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wmb(); /* drain writebuffer */ |
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/* wait for AC97 core to become ready */ |
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i = 1000; |
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while (!((__raw_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_DR)) && (--i)) |
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msleep(1); |
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if (i == 0) |
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printk(KERN_ERR "au1xpsc-ac97: AC97 ctrl not ready\n"); |
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} |
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/* AC97 controller operations */ |
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static struct snd_ac97_bus_ops psc_ac97_ops = { |
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.read = au1xpsc_ac97_read, |
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.write = au1xpsc_ac97_write, |
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.reset = au1xpsc_ac97_cold_reset, |
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.warm_reset = au1xpsc_ac97_warm_reset, |
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}; |
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static int au1xpsc_ac97_hw_params(struct snd_pcm_substream *substream, |
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struct snd_pcm_hw_params *params, |
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struct snd_soc_dai *dai) |
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{ |
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struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(dai); |
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unsigned long r, ro, stat; |
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int chans, t, stype = substream->stream; |
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chans = params_channels(params); |
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r = ro = __raw_readl(AC97_CFG(pscdata)); |
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stat = __raw_readl(AC97_STAT(pscdata)); |
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/* already active? */ |
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if (stat & (PSC_AC97STAT_TB | PSC_AC97STAT_RB)) { |
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/* reject parameters not currently set up */ |
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if ((PSC_AC97CFG_GET_LEN(r) != params->msbits) || |
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(pscdata->rate != params_rate(params))) |
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return -EINVAL; |
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} else { |
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/* set sample bitdepth: REG[24:21]=(BITS-2)/2 */ |
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r &= ~PSC_AC97CFG_LEN_MASK; |
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r |= PSC_AC97CFG_SET_LEN(params->msbits); |
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/* channels: enable slots for front L/R channel */ |
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if (stype == SNDRV_PCM_STREAM_PLAYBACK) { |
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r &= ~PSC_AC97CFG_TXSLOT_MASK; |
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r |= PSC_AC97CFG_TXSLOT_ENA(3); |
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r |= PSC_AC97CFG_TXSLOT_ENA(4); |
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} else { |
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r &= ~PSC_AC97CFG_RXSLOT_MASK; |
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r |= PSC_AC97CFG_RXSLOT_ENA(3); |
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r |= PSC_AC97CFG_RXSLOT_ENA(4); |
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} |
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/* do we need to poke the hardware? */ |
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if (!(r ^ ro)) |
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goto out; |
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/* ac97 engine is about to be disabled */ |
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mutex_lock(&pscdata->lock); |
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/* disable AC97 device controller first... */ |
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__raw_writel(r & ~PSC_AC97CFG_DE_ENABLE, AC97_CFG(pscdata)); |
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wmb(); /* drain writebuffer */ |
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/* ...wait for it... */ |
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t = 100; |
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while ((__raw_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_DR) && --t) |
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msleep(1); |
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if (!t) |
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printk(KERN_ERR "PSC-AC97: can't disable!\n"); |
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/* ...write config... */ |
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__raw_writel(r, AC97_CFG(pscdata)); |
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wmb(); /* drain writebuffer */ |
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/* ...enable the AC97 controller again... */ |
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__raw_writel(r | PSC_AC97CFG_DE_ENABLE, AC97_CFG(pscdata)); |
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wmb(); /* drain writebuffer */ |
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/* ...and wait for ready bit */ |
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t = 100; |
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while ((!(__raw_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_DR)) && --t) |
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msleep(1); |
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if (!t) |
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printk(KERN_ERR "PSC-AC97: can't enable!\n"); |
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mutex_unlock(&pscdata->lock); |
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pscdata->cfg = r; |
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pscdata->rate = params_rate(params); |
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} |
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out: |
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return 0; |
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} |
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static int au1xpsc_ac97_trigger(struct snd_pcm_substream *substream, |
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int cmd, struct snd_soc_dai *dai) |
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{ |
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struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(dai); |
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int ret, stype = substream->stream; |
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ret = 0; |
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switch (cmd) { |
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case SNDRV_PCM_TRIGGER_START: |
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case SNDRV_PCM_TRIGGER_RESUME: |
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__raw_writel(AC97PCR_CLRFIFO(stype), AC97_PCR(pscdata)); |
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wmb(); /* drain writebuffer */ |
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__raw_writel(AC97PCR_START(stype), AC97_PCR(pscdata)); |
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wmb(); /* drain writebuffer */ |
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break; |
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case SNDRV_PCM_TRIGGER_STOP: |
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case SNDRV_PCM_TRIGGER_SUSPEND: |
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__raw_writel(AC97PCR_STOP(stype), AC97_PCR(pscdata)); |
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wmb(); /* drain writebuffer */ |
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while (__raw_readl(AC97_STAT(pscdata)) & AC97STAT_BUSY(stype)) |
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asm volatile ("nop"); |
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__raw_writel(AC97PCR_CLRFIFO(stype), AC97_PCR(pscdata)); |
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wmb(); /* drain writebuffer */ |
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break; |
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default: |
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ret = -EINVAL; |
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} |
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return ret; |
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} |
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static int au1xpsc_ac97_startup(struct snd_pcm_substream *substream, |
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struct snd_soc_dai *dai) |
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{ |
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struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(dai); |
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snd_soc_dai_set_dma_data(dai, substream, &pscdata->dmaids[0]); |
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return 0; |
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} |
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static int au1xpsc_ac97_probe(struct snd_soc_dai *dai) |
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{ |
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return au1xpsc_ac97_workdata ? 0 : -ENODEV; |
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} |
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static const struct snd_soc_dai_ops au1xpsc_ac97_dai_ops = { |
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.startup = au1xpsc_ac97_startup, |
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.trigger = au1xpsc_ac97_trigger, |
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.hw_params = au1xpsc_ac97_hw_params, |
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}; |
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static const struct snd_soc_dai_driver au1xpsc_ac97_dai_template = { |
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.probe = au1xpsc_ac97_probe, |
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.playback = { |
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.rates = AC97_RATES, |
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.formats = AC97_FMTS, |
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.channels_min = 2, |
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.channels_max = 2, |
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}, |
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.capture = { |
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.rates = AC97_RATES, |
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.formats = AC97_FMTS, |
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.channels_min = 2, |
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.channels_max = 2, |
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}, |
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.ops = &au1xpsc_ac97_dai_ops, |
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}; |
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static const struct snd_soc_component_driver au1xpsc_ac97_component = { |
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.name = "au1xpsc-ac97", |
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}; |
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static int au1xpsc_ac97_drvprobe(struct platform_device *pdev) |
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{ |
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int ret; |
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struct resource *dmares; |
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unsigned long sel; |
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struct au1xpsc_audio_data *wd; |
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wd = devm_kzalloc(&pdev->dev, sizeof(struct au1xpsc_audio_data), |
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GFP_KERNEL); |
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if (!wd) |
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return -ENOMEM; |
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mutex_init(&wd->lock); |
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wd->mmio = devm_platform_ioremap_resource(pdev, 0); |
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if (IS_ERR(wd->mmio)) |
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return PTR_ERR(wd->mmio); |
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dmares = platform_get_resource(pdev, IORESOURCE_DMA, 0); |
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if (!dmares) |
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return -EBUSY; |
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wd->dmaids[SNDRV_PCM_STREAM_PLAYBACK] = dmares->start; |
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dmares = platform_get_resource(pdev, IORESOURCE_DMA, 1); |
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if (!dmares) |
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return -EBUSY; |
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wd->dmaids[SNDRV_PCM_STREAM_CAPTURE] = dmares->start; |
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/* configuration: max dma trigger threshold, enable ac97 */ |
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wd->cfg = PSC_AC97CFG_RT_FIFO8 | PSC_AC97CFG_TT_FIFO8 | |
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PSC_AC97CFG_DE_ENABLE; |
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/* preserve PSC clock source set up by platform */ |
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sel = __raw_readl(PSC_SEL(wd)) & PSC_SEL_CLK_MASK; |
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__raw_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd)); |
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wmb(); /* drain writebuffer */ |
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__raw_writel(0, PSC_SEL(wd)); |
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wmb(); /* drain writebuffer */ |
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__raw_writel(PSC_SEL_PS_AC97MODE | sel, PSC_SEL(wd)); |
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wmb(); /* drain writebuffer */ |
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/* name the DAI like this device instance ("au1xpsc-ac97.PSCINDEX") */ |
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memcpy(&wd->dai_drv, &au1xpsc_ac97_dai_template, |
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sizeof(struct snd_soc_dai_driver)); |
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wd->dai_drv.name = dev_name(&pdev->dev); |
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platform_set_drvdata(pdev, wd); |
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ret = snd_soc_set_ac97_ops(&psc_ac97_ops); |
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if (ret) |
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return ret; |
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ret = snd_soc_register_component(&pdev->dev, &au1xpsc_ac97_component, |
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&wd->dai_drv, 1); |
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if (ret) |
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return ret; |
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au1xpsc_ac97_workdata = wd; |
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return 0; |
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} |
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static int au1xpsc_ac97_drvremove(struct platform_device *pdev) |
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{ |
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struct au1xpsc_audio_data *wd = platform_get_drvdata(pdev); |
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snd_soc_unregister_component(&pdev->dev); |
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/* disable PSC completely */ |
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__raw_writel(0, AC97_CFG(wd)); |
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wmb(); /* drain writebuffer */ |
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__raw_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd)); |
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wmb(); /* drain writebuffer */ |
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au1xpsc_ac97_workdata = NULL; /* MDEV */ |
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return 0; |
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} |
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#ifdef CONFIG_PM |
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static int au1xpsc_ac97_drvsuspend(struct device *dev) |
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{ |
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struct au1xpsc_audio_data *wd = dev_get_drvdata(dev); |
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/* save interesting registers and disable PSC */ |
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wd->pm[0] = __raw_readl(PSC_SEL(wd)); |
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__raw_writel(0, AC97_CFG(wd)); |
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wmb(); /* drain writebuffer */ |
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__raw_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd)); |
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wmb(); /* drain writebuffer */ |
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return 0; |
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} |
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static int au1xpsc_ac97_drvresume(struct device *dev) |
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{ |
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struct au1xpsc_audio_data *wd = dev_get_drvdata(dev); |
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/* restore PSC clock config */ |
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__raw_writel(wd->pm[0] | PSC_SEL_PS_AC97MODE, PSC_SEL(wd)); |
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wmb(); /* drain writebuffer */ |
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/* after this point the ac97 core will cold-reset the codec. |
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* During cold-reset the PSC is reinitialized and the last |
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* configuration set up in hw_params() is restored. |
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*/ |
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return 0; |
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} |
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static const struct dev_pm_ops au1xpscac97_pmops = { |
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.suspend = au1xpsc_ac97_drvsuspend, |
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.resume = au1xpsc_ac97_drvresume, |
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}; |
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#define AU1XPSCAC97_PMOPS &au1xpscac97_pmops |
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#else |
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#define AU1XPSCAC97_PMOPS NULL |
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#endif |
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static struct platform_driver au1xpsc_ac97_driver = { |
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.driver = { |
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.name = "au1xpsc_ac97", |
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.pm = AU1XPSCAC97_PMOPS, |
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}, |
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.probe = au1xpsc_ac97_drvprobe, |
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.remove = au1xpsc_ac97_drvremove, |
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}; |
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module_platform_driver(au1xpsc_ac97_driver); |
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MODULE_LICENSE("GPL"); |
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MODULE_DESCRIPTION("Au12x0/Au1550 PSC AC97 ALSA ASoC audio driver"); |
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MODULE_AUTHOR("Manuel Lauss"); |
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