--- /dev/null
+/*
+ * Au12x0/Au1550 PSC ALSA ASoC audio support.
+ *
+ * (c) 2007-2009 MSC Vertriebsges.m.b.H.,
+ * Manuel Lauss <manuel.lauss@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 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->rtd->cpu_dai);
+}
+
+#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 = {
+ .bus_control = true,
+ .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 *iores, *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);
+
+ iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ wd->mmio = devm_ioremap_resource(&pdev->dev, iores);
+ 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 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");
+
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