1 files changed, 498 insertions, 0 deletions
diff --git a/sound/soc/au1x/psc-ac97.c b/sound/soc/au1x/psc-ac97.c
new file mode 100644
index 000000000..05eb36991
--- /dev/null
+++ b/sound/soc/au1x/psc-ac97.c
@@ -0,0 +1,498 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Au12x0/Au1550 PSC ALSA ASoC audio support.
+ *
+ * (c) 2007-2009 MSC Vertriebsges.m.b.H.,
+ *	Manuel Lauss <manuel.lauss@gmail.com>
+ *
+ * Au1xxx-PSC AC97 glue.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/delay.h>
+#include <linux/mutex.h>
+#include <linux/suspend.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/initval.h>
+#include <sound/soc.h>
+#include <asm/mach-au1x00/au1000.h>
+#include <asm/mach-au1x00/au1xxx_psc.h>
+
+#include "psc.h"
+
+/* how often to retry failed codec register reads/writes */
+#define AC97_RW_RETRIES	5
+
+#define AC97_DIR	\
+	(SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE)
+
+#define AC97_RATES	\
+	SNDRV_PCM_RATE_8000_48000
+
+#define AC97_FMTS	\
+	(SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3BE)
+
+#define AC97PCR_START(stype)	\
+	((stype) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_AC97PCR_TS : PSC_AC97PCR_RS)
+#define AC97PCR_STOP(stype)	\
+	((stype) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_AC97PCR_TP : PSC_AC97PCR_RP)
+#define AC97PCR_CLRFIFO(stype)	\
+	((stype) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_AC97PCR_TC : PSC_AC97PCR_RC)
+
+#define AC97STAT_BUSY(stype)	\
+	((stype) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_AC97STAT_TB : PSC_AC97STAT_RB)
+
+/* instance data. There can be only one, MacLeod!!!! */
+static struct au1xpsc_audio_data *au1xpsc_ac97_workdata;
+
+#if 0
+
+/* this could theoretically work, but ac97->bus->card->private_data can be NULL
+ * when snd_ac97_mixer() is called; I don't know if the rest further down the
+ * chain are always valid either.
+ */
+static inline struct au1xpsc_audio_data *ac97_to_pscdata(struct snd_ac97 *x)
+{
+	struct snd_soc_card *c = x->bus->card->private_data;
+	return snd_soc_dai_get_drvdata(c->asoc_rtd_to_cpu(rtd, 0));
+}
+
+#else
+
+#define ac97_to_pscdata(x)	au1xpsc_ac97_workdata
+
+#endif
+
+/* AC97 controller reads codec register */
+static unsigned short au1xpsc_ac97_read(struct snd_ac97 *ac97,
+					unsigned short reg)
+{
+	struct au1xpsc_audio_data *pscdata = ac97_to_pscdata(ac97);
+	unsigned short retry, tmo;
+	unsigned long data;
+
+	__raw_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata));
+	wmb(); /* drain writebuffer */
+
+	retry = AC97_RW_RETRIES;
+	do {
+		mutex_lock(&pscdata->lock);
+
+		__raw_writel(PSC_AC97CDC_RD | PSC_AC97CDC_INDX(reg),
+			  AC97_CDC(pscdata));
+		wmb(); /* drain writebuffer */
+
+		tmo = 20;
+		do {
+			udelay(21);
+			if (__raw_readl(AC97_EVNT(pscdata)) & PSC_AC97EVNT_CD)
+				break;
+		} while (--tmo);
+
+		data = __raw_readl(AC97_CDC(pscdata));
+
+		__raw_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata));
+		wmb(); /* drain writebuffer */
+
+		mutex_unlock(&pscdata->lock);
+
+		if (reg != ((data >> 16) & 0x7f))
+			tmo = 1;	/* wrong register, try again */
+
+	} while (--retry && !tmo);
+
+	return retry ? data & 0xffff : 0xffff;
+}
+
+/* AC97 controller writes to codec register */
+static void au1xpsc_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
+				unsigned short val)
+{
+	struct au1xpsc_audio_data *pscdata = ac97_to_pscdata(ac97);
+	unsigned int tmo, retry;
+
+	__raw_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata));
+	wmb(); /* drain writebuffer */
+
+	retry = AC97_RW_RETRIES;
+	do {
+		mutex_lock(&pscdata->lock);
+
+		__raw_writel(PSC_AC97CDC_INDX(reg) | (val & 0xffff),
+			  AC97_CDC(pscdata));
+		wmb(); /* drain writebuffer */
+
+		tmo = 20;
+		do {
+			udelay(21);
+			if (__raw_readl(AC97_EVNT(pscdata)) & PSC_AC97EVNT_CD)
+				break;
+		} while (--tmo);
+
+		__raw_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata));
+		wmb(); /* drain writebuffer */
+
+		mutex_unlock(&pscdata->lock);
+	} while (--retry && !tmo);
+}
+
+/* AC97 controller asserts a warm reset */
+static void au1xpsc_ac97_warm_reset(struct snd_ac97 *ac97)
+{
+	struct au1xpsc_audio_data *pscdata = ac97_to_pscdata(ac97);
+
+	__raw_writel(PSC_AC97RST_SNC, AC97_RST(pscdata));
+	wmb(); /* drain writebuffer */
+	msleep(10);
+	__raw_writel(0, AC97_RST(pscdata));
+	wmb(); /* drain writebuffer */
+}
+
+static void au1xpsc_ac97_cold_reset(struct snd_ac97 *ac97)
+{
+	struct au1xpsc_audio_data *pscdata = ac97_to_pscdata(ac97);
+	int i;
+
+	/* disable PSC during cold reset */
+	__raw_writel(0, AC97_CFG(au1xpsc_ac97_workdata));
+	wmb(); /* drain writebuffer */
+	__raw_writel(PSC_CTRL_DISABLE, PSC_CTRL(pscdata));
+	wmb(); /* drain writebuffer */
+
+	/* issue cold reset */
+	__raw_writel(PSC_AC97RST_RST, AC97_RST(pscdata));
+	wmb(); /* drain writebuffer */
+	msleep(500);
+	__raw_writel(0, AC97_RST(pscdata));
+	wmb(); /* drain writebuffer */
+
+	/* enable PSC */
+	__raw_writel(PSC_CTRL_ENABLE, PSC_CTRL(pscdata));
+	wmb(); /* drain writebuffer */
+
+	/* wait for PSC to indicate it's ready */
+	i = 1000;
+	while (!((__raw_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_SR)) && (--i))
+		msleep(1);
+
+	if (i == 0) {
+		printk(KERN_ERR "au1xpsc-ac97: PSC not ready!\n");
+		return;
+	}
+
+	/* enable the ac97 function */
+	__raw_writel(pscdata->cfg | PSC_AC97CFG_DE_ENABLE, AC97_CFG(pscdata));
+	wmb(); /* drain writebuffer */
+
+	/* wait for AC97 core to become ready */
+	i = 1000;
+	while (!((__raw_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_DR)) && (--i))
+		msleep(1);
+	if (i == 0)
+		printk(KERN_ERR "au1xpsc-ac97: AC97 ctrl not ready\n");
+}
+
+/* AC97 controller operations */
+static struct snd_ac97_bus_ops psc_ac97_ops = {
+	.read		= au1xpsc_ac97_read,
+	.write		= au1xpsc_ac97_write,
+	.reset		= au1xpsc_ac97_cold_reset,
+	.warm_reset	= au1xpsc_ac97_warm_reset,
+};
+
+static int au1xpsc_ac97_hw_params(struct snd_pcm_substream *substream,
+				  struct snd_pcm_hw_params *params,
+				  struct snd_soc_dai *dai)
+{
+	struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(dai);
+	unsigned long r, ro, stat;
+	int chans, t, stype = substream->stream;
+
+	chans = params_channels(params);
+
+	r = ro = __raw_readl(AC97_CFG(pscdata));
+	stat = __raw_readl(AC97_STAT(pscdata));
+
+	/* already active? */
+	if (stat & (PSC_AC97STAT_TB | PSC_AC97STAT_RB)) {
+		/* reject parameters not currently set up */
+		if ((PSC_AC97CFG_GET_LEN(r) != params->msbits) ||
+		    (pscdata->rate != params_rate(params)))
+			return -EINVAL;
+	} else {
+
+		/* set sample bitdepth: REG[24:21]=(BITS-2)/2 */
+		r &= ~PSC_AC97CFG_LEN_MASK;
+		r |= PSC_AC97CFG_SET_LEN(params->msbits);
+
+		/* channels: enable slots for front L/R channel */
+		if (stype == SNDRV_PCM_STREAM_PLAYBACK) {
+			r &= ~PSC_AC97CFG_TXSLOT_MASK;
+			r |= PSC_AC97CFG_TXSLOT_ENA(3);
+			r |= PSC_AC97CFG_TXSLOT_ENA(4);
+		} else {
+			r &= ~PSC_AC97CFG_RXSLOT_MASK;
+			r |= PSC_AC97CFG_RXSLOT_ENA(3);
+			r |= PSC_AC97CFG_RXSLOT_ENA(4);
+		}
+
+		/* do we need to poke the hardware? */
+		if (!(r ^ ro))
+			goto out;
+
+		/* ac97 engine is about to be disabled */
+		mutex_lock(&pscdata->lock);
+
+		/* disable AC97 device controller first... */
+		__raw_writel(r & ~PSC_AC97CFG_DE_ENABLE, AC97_CFG(pscdata));
+		wmb(); /* drain writebuffer */
+
+		/* ...wait for it... */
+		t = 100;
+		while ((__raw_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_DR) && --t)
+			msleep(1);
+
+		if (!t)
+			printk(KERN_ERR "PSC-AC97: can't disable!\n");
+
+		/* ...write config... */
+		__raw_writel(r, AC97_CFG(pscdata));
+		wmb(); /* drain writebuffer */
+
+		/* ...enable the AC97 controller again... */
+		__raw_writel(r | PSC_AC97CFG_DE_ENABLE, AC97_CFG(pscdata));
+		wmb(); /* drain writebuffer */
+
+		/* ...and wait for ready bit */
+		t = 100;
+		while ((!(__raw_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_DR)) && --t)
+			msleep(1);
+
+		if (!t)
+			printk(KERN_ERR "PSC-AC97: can't enable!\n");
+
+		mutex_unlock(&pscdata->lock);
+
+		pscdata->cfg = r;
+		pscdata->rate = params_rate(params);
+	}
+
+out:
+	return 0;
+}
+
+static int au1xpsc_ac97_trigger(struct snd_pcm_substream *substream,
+				int cmd, struct snd_soc_dai *dai)
+{
+	struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(dai);
+	int ret, stype = substream->stream;
+
+	ret = 0;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_RESUME:
+		__raw_writel(AC97PCR_CLRFIFO(stype), AC97_PCR(pscdata));
+		wmb(); /* drain writebuffer */
+		__raw_writel(AC97PCR_START(stype), AC97_PCR(pscdata));
+		wmb(); /* drain writebuffer */
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+		__raw_writel(AC97PCR_STOP(stype), AC97_PCR(pscdata));
+		wmb(); /* drain writebuffer */
+
+		while (__raw_readl(AC97_STAT(pscdata)) & AC97STAT_BUSY(stype))
+			asm volatile ("nop");
+
+		__raw_writel(AC97PCR_CLRFIFO(stype), AC97_PCR(pscdata));
+		wmb(); /* drain writebuffer */
+
+		break;
+	default:
+		ret = -EINVAL;
+	}
+	return ret;
+}
+
+static int au1xpsc_ac97_startup(struct snd_pcm_substream *substream,
+				struct snd_soc_dai *dai)
+{
+	struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(dai);
+	snd_soc_dai_set_dma_data(dai, substream, &pscdata->dmaids[0]);
+	return 0;
+}
+
+static int au1xpsc_ac97_probe(struct snd_soc_dai *dai)
+{
+	return au1xpsc_ac97_workdata ? 0 : -ENODEV;
+}
+
+static const struct snd_soc_dai_ops au1xpsc_ac97_dai_ops = {
+	.startup	= au1xpsc_ac97_startup,
+	.trigger	= au1xpsc_ac97_trigger,
+	.hw_params	= au1xpsc_ac97_hw_params,
+};
+
+static const struct snd_soc_dai_driver au1xpsc_ac97_dai_template = {
+	.probe			= au1xpsc_ac97_probe,
+	.playback = {
+		.rates		= AC97_RATES,
+		.formats	= AC97_FMTS,
+		.channels_min	= 2,
+		.channels_max	= 2,
+	},
+	.capture = {
+		.rates		= AC97_RATES,
+		.formats	= AC97_FMTS,
+		.channels_min	= 2,
+		.channels_max	= 2,
+	},
+	.ops = &au1xpsc_ac97_dai_ops,
+};
+
+static const struct snd_soc_component_driver au1xpsc_ac97_component = {
+	.name		= "au1xpsc-ac97",
+};
+
+static int au1xpsc_ac97_drvprobe(struct platform_device *pdev)
+{
+	int ret;
+	struct resource *dmares;
+	unsigned long sel;
+	struct au1xpsc_audio_data *wd;
+
+	wd = devm_kzalloc(&pdev->dev, sizeof(struct au1xpsc_audio_data),
+			  GFP_KERNEL);
+	if (!wd)
+		return -ENOMEM;
+
+	mutex_init(&wd->lock);
+
+	wd->mmio = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(wd->mmio))
+		return PTR_ERR(wd->mmio);
+
+	dmares = platform_get_resource(pdev, IORESOURCE_DMA, 0);
+	if (!dmares)
+		return -EBUSY;
+	wd->dmaids[SNDRV_PCM_STREAM_PLAYBACK] = dmares->start;
+
+	dmares = platform_get_resource(pdev, IORESOURCE_DMA, 1);
+	if (!dmares)
+		return -EBUSY;
+	wd->dmaids[SNDRV_PCM_STREAM_CAPTURE] = dmares->start;
+
+	/* configuration: max dma trigger threshold, enable ac97 */
+	wd->cfg = PSC_AC97CFG_RT_FIFO8 | PSC_AC97CFG_TT_FIFO8 |
+		  PSC_AC97CFG_DE_ENABLE;
+
+	/* preserve PSC clock source set up by platform	 */
+	sel = __raw_readl(PSC_SEL(wd)) & PSC_SEL_CLK_MASK;
+	__raw_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
+	wmb(); /* drain writebuffer */
+	__raw_writel(0, PSC_SEL(wd));
+	wmb(); /* drain writebuffer */
+	__raw_writel(PSC_SEL_PS_AC97MODE | sel, PSC_SEL(wd));
+	wmb(); /* drain writebuffer */
+
+	/* name the DAI like this device instance ("au1xpsc-ac97.PSCINDEX") */
+	memcpy(&wd->dai_drv, &au1xpsc_ac97_dai_template,
+	       sizeof(struct snd_soc_dai_driver));
+	wd->dai_drv.name = dev_name(&pdev->dev);
+
+	platform_set_drvdata(pdev, wd);
+
+	ret = snd_soc_set_ac97_ops(&psc_ac97_ops);
+	if (ret)
+		return ret;
+
+	ret = snd_soc_register_component(&pdev->dev, &au1xpsc_ac97_component,
+					 &wd->dai_drv, 1);
+	if (ret)
+		return ret;
+
+	au1xpsc_ac97_workdata = wd;
+	return 0;
+}
+
+static int au1xpsc_ac97_drvremove(struct platform_device *pdev)
+{
+	struct au1xpsc_audio_data *wd = platform_get_drvdata(pdev);
+
+	snd_soc_unregister_component(&pdev->dev);
+
+	/* disable PSC completely */
+	__raw_writel(0, AC97_CFG(wd));
+	wmb(); /* drain writebuffer */
+	__raw_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
+	wmb(); /* drain writebuffer */
+
+	au1xpsc_ac97_workdata = NULL;	/* MDEV */
+
+	return 0;
+}
+
+#ifdef CONFIG_PM
+static int au1xpsc_ac97_drvsuspend(struct device *dev)
+{
+	struct au1xpsc_audio_data *wd = dev_get_drvdata(dev);
+
+	/* save interesting registers and disable PSC */
+	wd->pm[0] = __raw_readl(PSC_SEL(wd));
+
+	__raw_writel(0, AC97_CFG(wd));
+	wmb(); /* drain writebuffer */
+	__raw_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
+	wmb(); /* drain writebuffer */
+
+	return 0;
+}
+
+static int au1xpsc_ac97_drvresume(struct device *dev)
+{
+	struct au1xpsc_audio_data *wd = dev_get_drvdata(dev);
+
+	/* restore PSC clock config */
+	__raw_writel(wd->pm[0] | PSC_SEL_PS_AC97MODE, PSC_SEL(wd));
+	wmb(); /* drain writebuffer */
+
+	/* after this point the ac97 core will cold-reset the codec.
+	 * During cold-reset the PSC is reinitialized and the last
+	 * configuration set up in hw_params() is restored.
+	 */
+	return 0;
+}
+
+static const struct dev_pm_ops au1xpscac97_pmops = {
+	.suspend	= au1xpsc_ac97_drvsuspend,
+	.resume		= au1xpsc_ac97_drvresume,
+};
+
+#define AU1XPSCAC97_PMOPS &au1xpscac97_pmops
+
+#else
+
+#define AU1XPSCAC97_PMOPS NULL
+
+#endif
+
+static struct platform_driver au1xpsc_ac97_driver = {
+	.driver	= {
+		.name	= "au1xpsc_ac97",
+		.pm	= AU1XPSCAC97_PMOPS,
+	},
+	.probe		= au1xpsc_ac97_drvprobe,
+	.remove		= au1xpsc_ac97_drvremove,
+};
+
+module_platform_driver(au1xpsc_ac97_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Au12x0/Au1550 PSC AC97 ALSA ASoC audio driver");
+MODULE_AUTHOR("Manuel Lauss");
+