ALSA: ASoC: Au12x0/Au1550 PSC Audio support

Audio for Au12x0/Au1550 PSCs in AC97 and I2S mode, for ASoC v1 framework.

- DBDMA, AC97 and I2S drivers
- sample AC97 machine code (Db1200)

Signed-off-by: Manuel Lauss <mano@roarinelk.homelinux.net>
Signed-off-by: Liam Girdwood <lg@opensource.wolfsonmicro.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

1 files changed, 387 insertions, 0 deletions

diff --git a/sound/soc/au1x/psc-ac97.c b/sound/soc/au1x/psc-ac97.c
new file mode 100644
index 00000000000..57facbad682
--- /dev/null
+++ b/sound/soc/au1x/psc-ac97.c
@@ -0,0 +1,387 @@
+/*
+ * Au12x0/Au1550 PSC ALSA ASoC audio support.
+ *
+ * (c) 2007-2008 MSC Vertriebsges.m.b.H.,
+ *	Manuel Lauss <mano@roarinelk.homelinux.net>
+ *
+ * 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.
+ *
+ * NOTE: all of these drivers can only work with a SINGLE instance
+ *	 of a PSC. Multiple independent audio devices are impossible
+ *	 with ASoC v1.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/delay.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"
+
+#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) == PCM_TX ? PSC_AC97PCR_TS : PSC_AC97PCR_RS)
+#define AC97PCR_STOP(stype)	\
+	((stype) == PCM_TX ? PSC_AC97PCR_TP : PSC_AC97PCR_RP)
+#define AC97PCR_CLRFIFO(stype)	\
+	((stype) == PCM_TX ? PSC_AC97PCR_TC : PSC_AC97PCR_RC)
+
+/* instance data. There can be only one, MacLeod!!!! */
+static struct au1xpsc_audio_data *au1xpsc_ac97_workdata;
+
+/* AC97 controller reads codec register */
+static unsigned short au1xpsc_ac97_read(struct snd_ac97 *ac97,
+					unsigned short reg)
+{
+	/* FIXME */
+	struct au1xpsc_audio_data *pscdata = au1xpsc_ac97_workdata;
+	unsigned short data, tmo;
+
+	au_writel(PSC_AC97CDC_RD | PSC_AC97CDC_INDX(reg), AC97_CDC(pscdata));
+	au_sync();
+
+	tmo = 1000;
+	while ((!(au_readl(AC97_EVNT(pscdata)) & PSC_AC97EVNT_CD)) && --tmo)
+		udelay(2);
+
+	if (!tmo)
+		data = 0xffff;
+	else
+		data = au_readl(AC97_CDC(pscdata)) & 0xffff;
+
+	au_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata));
+	au_sync();
+
+	return data;
+}
+
+/* AC97 controller writes to codec register */
+static void au1xpsc_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
+				unsigned short val)
+{
+	/* FIXME */
+	struct au1xpsc_audio_data *pscdata = au1xpsc_ac97_workdata;
+	unsigned int tmo;
+
+	au_writel(PSC_AC97CDC_INDX(reg) | (val & 0xffff), AC97_CDC(pscdata));
+	au_sync();
+	tmo = 1000;
+	while ((!(au_readl(AC97_EVNT(pscdata)) & PSC_AC97EVNT_CD)) && --tmo)
+		au_sync();
+
+	au_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata));
+	au_sync();
+}
+
+/* AC97 controller asserts a warm reset */
+static void au1xpsc_ac97_warm_reset(struct snd_ac97 *ac97)
+{
+	/* FIXME */
+	struct au1xpsc_audio_data *pscdata = au1xpsc_ac97_workdata;
+
+	au_writel(PSC_AC97RST_SNC, AC97_RST(pscdata));
+	au_sync();
+	msleep(10);
+	au_writel(0, AC97_RST(pscdata));
+	au_sync();
+}
+
+static void au1xpsc_ac97_cold_reset(struct snd_ac97 *ac97)
+{
+	/* FIXME */
+	struct au1xpsc_audio_data *pscdata = au1xpsc_ac97_workdata;
+	int i;
+
+	/* disable PSC during cold reset */
+	au_writel(0, AC97_CFG(au1xpsc_ac97_workdata));
+	au_sync();
+	au_writel(PSC_CTRL_DISABLE, PSC_CTRL(pscdata));
+	au_sync();
+
+	/* issue cold reset */
+	au_writel(PSC_AC97RST_RST, AC97_RST(pscdata));
+	au_sync();
+	msleep(500);
+	au_writel(0, AC97_RST(pscdata));
+	au_sync();
+
+	/* enable PSC */
+	au_writel(PSC_CTRL_ENABLE, PSC_CTRL(pscdata));
+	au_sync();
+
+	/* wait for PSC to indicate it's ready */
+	i = 100000;
+	while (!((au_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_SR)) && (--i))
+		au_sync();
+
+	if (i == 0) {
+		printk(KERN_ERR "au1xpsc-ac97: PSC not ready!\n");
+		return;
+	}
+
+	/* enable the ac97 function */
+	au_writel(pscdata->cfg | PSC_AC97CFG_DE_ENABLE, AC97_CFG(pscdata));
+	au_sync();
+
+	/* wait for AC97 core to become ready */
+	i = 100000;
+	while (!((au_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_DR)) && (--i))
+		au_sync();
+	if (i == 0)
+		printk(KERN_ERR "au1xpsc-ac97: AC97 ctrl not ready\n");
+}
+
+/* AC97 controller operations */
+struct snd_ac97_bus_ops soc_ac97_ops = {
+	.read		= au1xpsc_ac97_read,
+	.write		= au1xpsc_ac97_write,
+	.reset		= au1xpsc_ac97_cold_reset,
+	.warm_reset	= au1xpsc_ac97_warm_reset,
+};
+EXPORT_SYMBOL_GPL(soc_ac97_ops);
+
+static int au1xpsc_ac97_hw_params(struct snd_pcm_substream *substream,
+				  struct snd_pcm_hw_params *params)
+{
+	/* FIXME */
+	struct au1xpsc_audio_data *pscdata = au1xpsc_ac97_workdata;
+	unsigned long r, stat;
+	int chans, stype = SUBSTREAM_TYPE(substream);
+
+	chans = params_channels(params);
+
+	r = au_readl(AC97_CFG(pscdata));
+	stat = au_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 {
+		/* disable AC97 device controller first */
+		au_writel(r & ~PSC_AC97CFG_DE_ENABLE, AC97_CFG(pscdata));
+		au_sync();
+
+		/* 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 == PCM_TX) {
+			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);
+		}
+
+		/* finally enable the AC97 controller again */
+		au_writel(r | PSC_AC97CFG_DE_ENABLE, AC97_CFG(pscdata));
+		au_sync();
+
+		pscdata->cfg = r;
+		pscdata->rate = params_rate(params);
+	}
+
+	return 0;
+}
+
+static int au1xpsc_ac97_trigger(struct snd_pcm_substream *substream,
+				int cmd)
+{
+	/* FIXME */
+	struct au1xpsc_audio_data *pscdata = au1xpsc_ac97_workdata;
+	int ret, stype = SUBSTREAM_TYPE(substream);
+
+	ret = 0;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_RESUME:
+		au_writel(AC97PCR_START(stype), AC97_PCR(pscdata));
+		au_sync();
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+		au_writel(AC97PCR_STOP(stype), AC97_PCR(pscdata));
+		au_sync();
+		break;
+	default:
+		ret = -EINVAL;
+	}
+	return ret;
+}
+
+static int au1xpsc_ac97_probe(struct platform_device *pdev,
+			      struct snd_soc_dai *dai)
+{
+	int ret;
+	struct resource *r;
+	unsigned long sel;
+
+	if (au1xpsc_ac97_workdata)
+		return -EBUSY;
+
+	au1xpsc_ac97_workdata =
+		kzalloc(sizeof(struct au1xpsc_audio_data), GFP_KERNEL);
+	if (!au1xpsc_ac97_workdata)
+		return -ENOMEM;
+
+	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!r) {
+		ret = -ENODEV;
+		goto out0;
+	}
+
+	ret = -EBUSY;
+	au1xpsc_ac97_workdata->ioarea =
+		request_mem_region(r->start, r->end - r->start + 1,
+					"au1xpsc_ac97");
+	if (!au1xpsc_ac97_workdata->ioarea)
+		goto out0;
+
+	au1xpsc_ac97_workdata->mmio = ioremap(r->start, 0xffff);
+	if (!au1xpsc_ac97_workdata->mmio)
+		goto out1;
+
+	/* configuration: max dma trigger threshold, enable ac97 */
+	 au1xpsc_ac97_workdata->cfg = PSC_AC97CFG_RT_FIFO8 |
+				      PSC_AC97CFG_TT_FIFO8 |
+				      PSC_AC97CFG_DE_ENABLE;
+
+	/* preserve PSC clock source set up by platform (dev.platform_data
+	 * is already occupied by soc layer)
+	 */
+	sel = au_readl(PSC_SEL(au1xpsc_ac97_workdata)) & PSC_SEL_CLK_MASK;
+	au_writel(PSC_CTRL_DISABLE, PSC_CTRL(au1xpsc_ac97_workdata));
+	au_sync();
+	au_writel(0, PSC_SEL(au1xpsc_ac97_workdata));
+	au_sync();
+	au_writel(PSC_SEL_PS_AC97MODE | sel, PSC_SEL(au1xpsc_ac97_workdata));
+	au_sync();
+	/* next up: cold reset.  Dont check for PSC-ready now since
+	 * there may not be any codec clock yet.
+	 */
+
+	return 0;
+
+out1:
+	release_resource(au1xpsc_ac97_workdata->ioarea);
+	kfree(au1xpsc_ac97_workdata->ioarea);
+out0:
+	kfree(au1xpsc_ac97_workdata);
+	au1xpsc_ac97_workdata = NULL;
+	return ret;
+}
+
+static void au1xpsc_ac97_remove(struct platform_device *pdev,
+				struct snd_soc_dai *dai)
+{
+	/* disable PSC completely */
+	au_writel(0, AC97_CFG(au1xpsc_ac97_workdata));
+	au_sync();
+	au_writel(PSC_CTRL_DISABLE, PSC_CTRL(au1xpsc_ac97_workdata));
+	au_sync();
+
+	iounmap(au1xpsc_ac97_workdata->mmio);
+	release_resource(au1xpsc_ac97_workdata->ioarea);
+	kfree(au1xpsc_ac97_workdata->ioarea);
+	kfree(au1xpsc_ac97_workdata);
+	au1xpsc_ac97_workdata = NULL;
+}
+
+static int au1xpsc_ac97_suspend(struct platform_device *pdev,
+				struct snd_soc_dai *dai)
+{
+	/* save interesting registers and disable PSC */
+	au1xpsc_ac97_workdata->pm[0] =
+			au_readl(PSC_SEL(au1xpsc_ac97_workdata));
+
+	au_writel(0, AC97_CFG(au1xpsc_ac97_workdata));
+	au_sync();
+	au_writel(PSC_CTRL_DISABLE, PSC_CTRL(au1xpsc_ac97_workdata));
+	au_sync();
+
+	return 0;
+}
+
+static int au1xpsc_ac97_resume(struct platform_device *pdev,
+			       struct snd_soc_dai *dai)
+{
+	/* restore PSC clock config */
+	au_writel(au1xpsc_ac97_workdata->pm[0] | PSC_SEL_PS_AC97MODE,
+			PSC_SEL(au1xpsc_ac97_workdata));
+	au_sync();
+
+	/* 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;
+}
+
+struct snd_soc_dai au1xpsc_ac97_dai = {
+	.name			= "au1xpsc_ac97",
+	.type			= SND_SOC_DAI_AC97,
+	.probe			= au1xpsc_ac97_probe,
+	.remove			= au1xpsc_ac97_remove,
+	.suspend		= au1xpsc_ac97_suspend,
+	.resume			= au1xpsc_ac97_resume,
+	.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 = {
+		.trigger	= au1xpsc_ac97_trigger,
+		.hw_params	= au1xpsc_ac97_hw_params,
+	},
+};
+EXPORT_SYMBOL_GPL(au1xpsc_ac97_dai);
+
+static int __init au1xpsc_ac97_init(void)
+{
+	au1xpsc_ac97_workdata = NULL;
+	return 0;
+}
+
+static void __exit au1xpsc_ac97_exit(void)
+{
+}
+
+module_init(au1xpsc_ac97_init);
+module_exit(au1xpsc_ac97_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Au12x0/Au1550 PSC AC97 ALSA ASoC audio driver");
+MODULE_AUTHOR("Manuel Lauss <mano@roarinelk.homelinux.net>");