1 files changed, 397 insertions, 0 deletions
diff --git a/sound/soc/nuc900/nuc900-ac97.c b/sound/soc/nuc900/nuc900-ac97.c
new file mode 100644
index 000000000..81b09d740
--- /dev/null
+++ b/sound/soc/nuc900/nuc900-ac97.c
@@ -0,0 +1,397 @@
+/*
+ * Copyright (c) 2009-2010 Nuvoton technology corporation.
+ *
+ * Wan ZongShun <mcuos.com@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation;version 2 of the License.
+ *
+ */
+
+#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 <linux/clk.h>
+
+#include <mach/mfp.h>
+
+#include "nuc900-audio.h"
+
+static DEFINE_MUTEX(ac97_mutex);
+struct nuc900_audio *nuc900_ac97_data;
+EXPORT_SYMBOL_GPL(nuc900_ac97_data);
+
+static int nuc900_checkready(void)
+{
+	struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
+
+	if (!(AUDIO_READ(nuc900_audio->mmio + ACTL_ACIS0) & CODEC_READY))
+		return -EPERM;
+
+	return 0;
+}
+
+/* AC97 controller reads codec register */
+static unsigned short nuc900_ac97_read(struct snd_ac97 *ac97,
+					unsigned short reg)
+{
+	struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
+	unsigned long timeout = 0x10000, val;
+
+	mutex_lock(&ac97_mutex);
+
+	val = nuc900_checkready();
+	if (val) {
+		dev_err(nuc900_audio->dev, "AC97 codec is not ready\n");
+		goto out;
+	}
+
+	/* set the R_WB bit and write register index */
+	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS1, R_WB | reg);
+
+	/* set the valid frame bit and valid slots */
+	val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
+	val |= (VALID_FRAME | SLOT1_VALID);
+	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, val);
+
+	udelay(100);
+
+	/* polling the AC_R_FINISH */
+	while (!(AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON) & AC_R_FINISH)
+								&& --timeout)
+		mdelay(1);
+
+	if (!timeout) {
+		dev_err(nuc900_audio->dev, "AC97 read register time out !\n");
+		val = -EPERM;
+		goto out;
+	}
+
+	val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0) ;
+	val &= ~SLOT1_VALID;
+	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, val);
+
+	if (AUDIO_READ(nuc900_audio->mmio + ACTL_ACIS1) >> 2 != reg) {
+		dev_err(nuc900_audio->dev,
+				"R_INDEX of REG_ACTL_ACIS1 not match!\n");
+	}
+
+	udelay(100);
+	val = (AUDIO_READ(nuc900_audio->mmio + ACTL_ACIS2) & 0xFFFF);
+
+out:
+	mutex_unlock(&ac97_mutex);
+	return val;
+}
+
+/* AC97 controller writes to codec register */
+static void nuc900_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
+				unsigned short val)
+{
+	struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
+	unsigned long tmp, timeout = 0x10000;
+
+	mutex_lock(&ac97_mutex);
+
+	tmp = nuc900_checkready();
+	if (tmp)
+		dev_err(nuc900_audio->dev, "AC97 codec is not ready\n");
+
+	/* clear the R_WB bit and write register index */
+	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS1, reg);
+
+	/* write register value */
+	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS2, val);
+
+	/* set the valid frame bit and valid slots */
+	tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
+	tmp |= SLOT1_VALID | SLOT2_VALID | VALID_FRAME;
+	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp);
+
+	udelay(100);
+
+	/* polling the AC_W_FINISH */
+	while ((AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON) & AC_W_FINISH)
+								&& --timeout)
+		mdelay(1);
+
+	if (!timeout)
+		dev_err(nuc900_audio->dev, "AC97 write register time out !\n");
+
+	tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
+	tmp &= ~(SLOT1_VALID | SLOT2_VALID);
+	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp);
+
+	mutex_unlock(&ac97_mutex);
+
+}
+
+static void nuc900_ac97_warm_reset(struct snd_ac97 *ac97)
+{
+	struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
+	unsigned long val;
+
+	mutex_lock(&ac97_mutex);
+
+	/* warm reset AC 97 */
+	val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON);
+	val |= AC_W_RES;
+	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACCON, val);
+
+	udelay(100);
+
+	val = nuc900_checkready();
+	if (val)
+		dev_err(nuc900_audio->dev, "AC97 codec is not ready\n");
+
+	mutex_unlock(&ac97_mutex);
+}
+
+static void nuc900_ac97_cold_reset(struct snd_ac97 *ac97)
+{
+	struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
+	unsigned long val;
+
+	mutex_lock(&ac97_mutex);
+
+	/* reset Audio Controller */
+	val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
+	val |= ACTL_RESET_BIT;
+	AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
+
+	val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
+	val &= (~ACTL_RESET_BIT);
+	AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
+
+	/* reset AC-link interface */
+
+	val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
+	val |= AC_RESET;
+	AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
+
+	val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
+	val &= ~AC_RESET;
+	AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
+
+	/* cold reset AC 97 */
+	val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON);
+	val |= AC_C_RES;
+	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACCON, val);
+
+	val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON);
+	val &= (~AC_C_RES);
+	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACCON, val);
+
+	udelay(100);
+
+	mutex_unlock(&ac97_mutex);
+
+}
+
+/* AC97 controller operations */
+static struct snd_ac97_bus_ops nuc900_ac97_ops = {
+	.read		= nuc900_ac97_read,
+	.write		= nuc900_ac97_write,
+	.reset		= nuc900_ac97_cold_reset,
+	.warm_reset	= nuc900_ac97_warm_reset,
+};
+
+static int nuc900_ac97_trigger(struct snd_pcm_substream *substream,
+				int cmd, struct snd_soc_dai *dai)
+{
+	struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
+	int ret;
+	unsigned long val, tmp;
+
+	ret = 0;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_RESUME:
+		val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
+		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+			tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
+			tmp |= (SLOT3_VALID | SLOT4_VALID | VALID_FRAME);
+			AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp);
+
+			tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_PSR);
+			tmp |= (P_DMA_END_IRQ | P_DMA_MIDDLE_IRQ);
+			AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, tmp);
+			val |= AC_PLAY;
+		} else {
+			tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_RSR);
+			tmp |= (R_DMA_END_IRQ | R_DMA_MIDDLE_IRQ);
+
+			AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, tmp);
+			val |= AC_RECORD;
+		}
+
+		AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
+
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+		val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
+		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+			tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
+			tmp &= ~(SLOT3_VALID | SLOT4_VALID);
+			AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp);
+
+			AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, RESET_PRSR);
+			val &= ~AC_PLAY;
+		} else {
+			AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, RESET_PRSR);
+			val &= ~AC_RECORD;
+		}
+
+		AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
+
+		break;
+	default:
+		ret = -EINVAL;
+	}
+
+	return ret;
+}
+
+static int nuc900_ac97_probe(struct snd_soc_dai *dai)
+{
+	struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
+	unsigned long val;
+
+	mutex_lock(&ac97_mutex);
+
+	/* enable unit clock */
+	clk_enable(nuc900_audio->clk);
+
+	/* enable audio controller and AC-link interface */
+	val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON);
+	val |= (IIS_AC_PIN_SEL | ACLINK_EN);
+	AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val);
+
+	mutex_unlock(&ac97_mutex);
+
+	return 0;
+}
+
+static int nuc900_ac97_remove(struct snd_soc_dai *dai)
+{
+	struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
+
+	clk_disable(nuc900_audio->clk);
+	return 0;
+}
+
+static const struct snd_soc_dai_ops nuc900_ac97_dai_ops = {
+	.trigger	= nuc900_ac97_trigger,
+};
+
+static struct snd_soc_dai_driver nuc900_ac97_dai = {
+	.probe			= nuc900_ac97_probe,
+	.remove			= nuc900_ac97_remove,
+	.bus_control		= true,
+	.playback = {
+		.rates		= SNDRV_PCM_RATE_8000_48000,
+		.formats	= SNDRV_PCM_FMTBIT_S16_LE,
+		.channels_min	= 1,
+		.channels_max	= 2,
+	},
+	.capture = {
+		.rates		= SNDRV_PCM_RATE_8000_48000,
+		.formats	= SNDRV_PCM_FMTBIT_S16_LE,
+		.channels_min	= 1,
+		.channels_max	= 2,
+	},
+	.ops = &nuc900_ac97_dai_ops,
+};
+
+static const struct snd_soc_component_driver nuc900_ac97_component = {
+	.name		= "nuc900-ac97",
+};
+
+static int nuc900_ac97_drvprobe(struct platform_device *pdev)
+{
+	struct nuc900_audio *nuc900_audio;
+	int ret;
+
+	if (nuc900_ac97_data)
+		return -EBUSY;
+
+	nuc900_audio = devm_kzalloc(&pdev->dev, sizeof(struct nuc900_audio),
+				    GFP_KERNEL);
+	if (!nuc900_audio)
+		return -ENOMEM;
+
+	spin_lock_init(&nuc900_audio->lock);
+
+	nuc900_audio->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	nuc900_audio->mmio = devm_ioremap_resource(&pdev->dev,
+						   nuc900_audio->res);
+	if (IS_ERR(nuc900_audio->mmio))
+		return PTR_ERR(nuc900_audio->mmio);
+
+	nuc900_audio->clk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(nuc900_audio->clk)) {
+		ret = PTR_ERR(nuc900_audio->clk);
+		goto out;
+	}
+
+	ret = platform_get_irq(pdev, 0);
+	if (ret < 0)
+		goto out;
+	nuc900_audio->irq_num = ret;
+
+	nuc900_ac97_data = nuc900_audio;
+
+	ret = snd_soc_set_ac97_ops(&nuc900_ac97_ops);
+	if (ret)
+		goto out;
+
+	ret = snd_soc_register_component(&pdev->dev, &nuc900_ac97_component,
+					 &nuc900_ac97_dai, 1);
+	if (ret)
+		goto out;
+
+	/* enbale ac97 multifunction pin */
+	mfp_set_groupg(nuc900_audio->dev, NULL);
+
+	return 0;
+
+out:
+	snd_soc_set_ac97_ops(NULL);
+	return ret;
+}
+
+static int nuc900_ac97_drvremove(struct platform_device *pdev)
+{
+	snd_soc_unregister_component(&pdev->dev);
+
+	nuc900_ac97_data = NULL;
+	snd_soc_set_ac97_ops(NULL);
+
+	return 0;
+}
+
+static struct platform_driver nuc900_ac97_driver = {
+	.driver	= {
+		.name	= "nuc900-ac97",
+	},
+	.probe		= nuc900_ac97_drvprobe,
+	.remove		= nuc900_ac97_drvremove,
+};
+
+module_platform_driver(nuc900_ac97_driver);
+
+MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
+MODULE_DESCRIPTION("NUC900 AC97 SoC driver!");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:nuc900-ac97");