ASoC: kirkwood: Add i2s support
This patch enables support for the i2s controller available on kirkwood
platforms
Signed-off-by: Arnaud Patard <apatard@mandriva.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/kirkwood/kirkwood-i2s.c b/sound/soc/kirkwood/kirkwood-i2s.c
new file mode 100644
index 0000000..0adc597
--- /dev/null
+++ b/sound/soc/kirkwood/kirkwood-i2s.c
@@ -0,0 +1,485 @@
+/*
+ * kirkwood-i2s.c
+ *
+ * (c) 2010 Arnaud Patard <apatard@mandriva.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; either version 2 of the License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/mbus.h>
+#include <linux/delay.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <plat/audio.h>
+#include "kirkwood-i2s.h"
+#include "kirkwood.h"
+
+#define DRV_NAME "kirkwood-i2s"
+
+#define KIRKWOOD_I2S_RATES \
+ (SNDRV_PCM_RATE_44100 | \
+ SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000)
+#define KIRKWOOD_I2S_FORMATS \
+ (SNDRV_PCM_FMTBIT_S16_LE | \
+ SNDRV_PCM_FMTBIT_S24_LE | \
+ SNDRV_PCM_FMTBIT_S32_LE)
+
+
+struct snd_soc_dai kirkwood_i2s_dai;
+static struct kirkwood_dma_data *priv;
+
+static int kirkwood_i2s_set_fmt(struct snd_soc_dai *cpu_dai,
+ unsigned int fmt)
+{
+ unsigned long mask;
+ unsigned long value;
+
+ switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
+ case SND_SOC_DAIFMT_RIGHT_J:
+ mask = KIRKWOOD_I2S_CTL_RJ;
+ break;
+ case SND_SOC_DAIFMT_LEFT_J:
+ mask = KIRKWOOD_I2S_CTL_LJ;
+ break;
+ case SND_SOC_DAIFMT_I2S:
+ mask = KIRKWOOD_I2S_CTL_I2S;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ /*
+ * Set same format for playback and record
+ * This avoids some troubles.
+ */
+ value = readl(priv->io+KIRKWOOD_I2S_PLAYCTL);
+ value &= ~KIRKWOOD_I2S_CTL_JUST_MASK;
+ value |= mask;
+ writel(value, priv->io+KIRKWOOD_I2S_PLAYCTL);
+
+ value = readl(priv->io+KIRKWOOD_I2S_RECCTL);
+ value &= ~KIRKWOOD_I2S_CTL_JUST_MASK;
+ value |= mask;
+ writel(value, priv->io+KIRKWOOD_I2S_RECCTL);
+
+ return 0;
+}
+
+static inline void kirkwood_set_dco(void __iomem *io, unsigned long rate)
+{
+ unsigned long value;
+
+ value = KIRKWOOD_DCO_CTL_OFFSET_0;
+ switch (rate) {
+ default:
+ case 44100:
+ value |= KIRKWOOD_DCO_CTL_FREQ_11;
+ break;
+ case 48000:
+ value |= KIRKWOOD_DCO_CTL_FREQ_12;
+ break;
+ case 96000:
+ value |= KIRKWOOD_DCO_CTL_FREQ_24;
+ break;
+ }
+ writel(value, io + KIRKWOOD_DCO_CTL);
+
+ /* wait for dco locked */
+ do {
+ cpu_relax();
+ value = readl(io + KIRKWOOD_DCO_SPCR_STATUS);
+ value &= KIRKWOOD_DCO_SPCR_STATUS;
+ } while (value == 0);
+}
+
+static int kirkwood_i2s_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params,
+ struct snd_soc_dai *dai)
+{
+ unsigned int i2s_reg, reg;
+ unsigned long i2s_value, value;
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ i2s_reg = KIRKWOOD_I2S_PLAYCTL;
+ reg = KIRKWOOD_PLAYCTL;
+ } else {
+ i2s_reg = KIRKWOOD_I2S_RECCTL;
+ reg = KIRKWOOD_RECCTL;
+ }
+
+ /* set dco conf */
+ kirkwood_set_dco(priv->io, params_rate(params));
+
+ i2s_value = readl(priv->io+i2s_reg);
+ i2s_value &= ~KIRKWOOD_I2S_CTL_SIZE_MASK;
+
+ value = readl(priv->io+reg);
+ value &= ~KIRKWOOD_PLAYCTL_SIZE_MASK;
+
+ /*
+ * Size settings in play/rec i2s control regs and play/rec control
+ * regs must be the same.
+ */
+ switch (params_format(params)) {
+ case SNDRV_PCM_FORMAT_S16_LE:
+ i2s_value |= KIRKWOOD_I2S_CTL_SIZE_16;
+ value |= KIRKWOOD_PLAYCTL_SIZE_16_C;
+ break;
+ /*
+ * doesn't work... S20_3LE != kirkwood 20bit format ?
+ *
+ case SNDRV_PCM_FORMAT_S20_3LE:
+ i2s_value |= KIRKWOOD_I2S_CTL_SIZE_20;
+ value |= KIRKWOOD_PLAYCTL_SIZE_20;
+ break;
+ */
+ case SNDRV_PCM_FORMAT_S24_LE:
+ i2s_value |= KIRKWOOD_I2S_CTL_SIZE_24;
+ value |= KIRKWOOD_PLAYCTL_SIZE_24;
+ break;
+ case SNDRV_PCM_FORMAT_S32_LE:
+ i2s_value |= KIRKWOOD_I2S_CTL_SIZE_32;
+ value |= KIRKWOOD_PLAYCTL_SIZE_32;
+ break;
+ default:
+ return -EINVAL;
+ }
+ writel(i2s_value, priv->io+i2s_reg);
+ writel(value, priv->io+reg);
+
+ return 0;
+}
+
+static int kirkwood_i2s_play_trigger(struct snd_pcm_substream *substream,
+ int cmd, struct snd_soc_dai *dai)
+{
+ unsigned long value;
+
+ /*
+ * specs says KIRKWOOD_PLAYCTL must be read 2 times before
+ * changing it. So read 1 time here and 1 later.
+ */
+ value = readl(priv->io + KIRKWOOD_PLAYCTL);
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ /* stop audio, enable interrupts */
+ value = readl(priv->io + KIRKWOOD_PLAYCTL);
+ value |= KIRKWOOD_PLAYCTL_PAUSE;
+ writel(value, priv->io + KIRKWOOD_PLAYCTL);
+
+ value = readl(priv->io + KIRKWOOD_INT_MASK);
+ value |= KIRKWOOD_INT_CAUSE_PLAY_BYTES;
+ writel(value, priv->io + KIRKWOOD_INT_MASK);
+
+ /* configure audio & enable i2s playback */
+ value = readl(priv->io + KIRKWOOD_PLAYCTL);
+ value &= ~KIRKWOOD_PLAYCTL_BURST_MASK;
+ value &= ~(KIRKWOOD_PLAYCTL_PAUSE|KIRKWOOD_PLAYCTL_SPDIF_EN);
+
+ if (priv->burst == 32)
+ value |= KIRKWOOD_PLAYCTL_BURST_32;
+ else
+ value |= KIRKWOOD_PLAYCTL_BURST_128;
+ value |= KIRKWOOD_PLAYCTL_I2S_EN;
+ writel(value, priv->io + KIRKWOOD_PLAYCTL);
+ break;
+
+ case SNDRV_PCM_TRIGGER_STOP:
+ /* stop audio, disable interrupts */
+ value = readl(priv->io + KIRKWOOD_PLAYCTL);
+ value |= KIRKWOOD_PLAYCTL_PAUSE;
+ writel(value, priv->io + KIRKWOOD_PLAYCTL);
+
+ value = readl(priv->io + KIRKWOOD_INT_MASK);
+ value &= ~KIRKWOOD_INT_CAUSE_PLAY_BYTES;
+ writel(value, priv->io + KIRKWOOD_INT_MASK);
+
+ /* disable all playbacks */
+ value = readl(priv->io + KIRKWOOD_PLAYCTL);
+ value &= ~(KIRKWOOD_PLAYCTL_I2S_EN | KIRKWOOD_PLAYCTL_SPDIF_EN);
+ writel(value, priv->io + KIRKWOOD_PLAYCTL);
+ break;
+
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ value = readl(priv->io + KIRKWOOD_PLAYCTL);
+ value |= KIRKWOOD_PLAYCTL_PAUSE;
+ writel(value, priv->io + KIRKWOOD_PLAYCTL);
+ break;
+
+ case SNDRV_PCM_TRIGGER_RESUME:
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ value = readl(priv->io + KIRKWOOD_PLAYCTL);
+ value &= ~KIRKWOOD_PLAYCTL_PAUSE;
+ writel(value, priv->io + KIRKWOOD_PLAYCTL);
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int kirkwood_i2s_rec_trigger(struct snd_pcm_substream *substream,
+ int cmd, struct snd_soc_dai *dai)
+{
+ unsigned long value;
+
+ value = readl(priv->io + KIRKWOOD_RECCTL);
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ /* stop audio, enable interrupts */
+ value = readl(priv->io + KIRKWOOD_RECCTL);
+ value |= KIRKWOOD_RECCTL_PAUSE;
+ writel(value, priv->io + KIRKWOOD_RECCTL);
+
+ value = readl(priv->io + KIRKWOOD_INT_MASK);
+ value |= KIRKWOOD_INT_CAUSE_REC_BYTES;
+ writel(value, priv->io + KIRKWOOD_INT_MASK);
+
+ /* configure audio & enable i2s record */
+ value = readl(priv->io + KIRKWOOD_RECCTL);
+ value &= ~KIRKWOOD_RECCTL_BURST_MASK;
+ value &= ~KIRKWOOD_RECCTL_MONO;
+ value &= ~(KIRKWOOD_RECCTL_PAUSE | KIRKWOOD_RECCTL_SPDIF_EN);
+
+ if (priv->burst == 32)
+ value |= KIRKWOOD_RECCTL_BURST_32;
+ else
+ value |= KIRKWOOD_RECCTL_BURST_128;
+ value |= KIRKWOOD_RECCTL_I2S_EN;
+
+ writel(value, priv->io + KIRKWOOD_RECCTL);
+ break;
+
+ case SNDRV_PCM_TRIGGER_STOP:
+ /* stop audio, disable interrupts */
+ value = readl(priv->io + KIRKWOOD_RECCTL);
+ value |= KIRKWOOD_RECCTL_PAUSE;
+ writel(value, priv->io + KIRKWOOD_RECCTL);
+
+ value = readl(priv->io + KIRKWOOD_INT_MASK);
+ value &= ~KIRKWOOD_INT_CAUSE_REC_BYTES;
+ writel(value, priv->io + KIRKWOOD_INT_MASK);
+
+ /* disable all records */
+ value = readl(priv->io + KIRKWOOD_RECCTL);
+ value &= ~(KIRKWOOD_RECCTL_I2S_EN | KIRKWOOD_RECCTL_SPDIF_EN);
+ writel(value, priv->io + KIRKWOOD_RECCTL);
+ break;
+
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ value = readl(priv->io + KIRKWOOD_RECCTL);
+ value |= KIRKWOOD_RECCTL_PAUSE;
+ writel(value, priv->io + KIRKWOOD_RECCTL);
+ break;
+
+ case SNDRV_PCM_TRIGGER_RESUME:
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ value = readl(priv->io + KIRKWOOD_RECCTL);
+ value &= ~KIRKWOOD_RECCTL_PAUSE;
+ writel(value, priv->io + KIRKWOOD_RECCTL);
+ break;
+
+ default:
+ return -EINVAL;
+ break;
+ }
+
+ return 0;
+}
+
+static int kirkwood_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
+ struct snd_soc_dai *dai)
+{
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ return kirkwood_i2s_play_trigger(substream, cmd, dai);
+ else
+ return kirkwood_i2s_rec_trigger(substream, cmd, dai);
+
+ return 0;
+}
+
+static int kirkwood_i2s_probe(struct platform_device *pdev,
+ struct snd_soc_dai *dai)
+{
+ unsigned long value;
+ unsigned int reg_data;
+
+ /* put system in a "safe" state : */
+ /* disable audio interrupts */
+ writel(0xffffffff, priv->io + KIRKWOOD_INT_CAUSE);
+ writel(0, priv->io + KIRKWOOD_INT_MASK);
+
+ reg_data = readl(priv->io + 0x1200);
+ reg_data &= (~(0x333FF8));
+ reg_data |= 0x111D18;
+ writel(reg_data, priv->io + 0x1200);
+
+ msleep(500);
+
+ reg_data = readl(priv->io + 0x1200);
+ reg_data &= (~(0x333FF8));
+ reg_data |= 0x111D18;
+ writel(reg_data, priv->io + 0x1200);
+
+ /* disable playback/record */
+ value = readl(priv->io + KIRKWOOD_PLAYCTL);
+ value &= ~(KIRKWOOD_PLAYCTL_I2S_EN|KIRKWOOD_PLAYCTL_SPDIF_EN);
+ writel(value, priv->io + KIRKWOOD_PLAYCTL);
+
+ value = readl(priv->io + KIRKWOOD_RECCTL);
+ value &= ~(KIRKWOOD_RECCTL_I2S_EN | KIRKWOOD_RECCTL_SPDIF_EN);
+ writel(value, priv->io + KIRKWOOD_RECCTL);
+
+ return 0;
+
+}
+
+static void kirkwood_i2s_remove(struct platform_device *pdev,
+ struct snd_soc_dai *dai)
+{
+}
+
+static struct snd_soc_dai_ops kirkwood_i2s_dai_ops = {
+ .trigger = kirkwood_i2s_trigger,
+ .hw_params = kirkwood_i2s_hw_params,
+ .set_fmt = kirkwood_i2s_set_fmt,
+};
+
+
+struct snd_soc_dai kirkwood_i2s_dai = {
+ .name = DRV_NAME,
+ .id = 0,
+ .probe = kirkwood_i2s_probe,
+ .remove = kirkwood_i2s_remove,
+ .playback = {
+ .channels_min = 1,
+ .channels_max = 2,
+ .rates = KIRKWOOD_I2S_RATES,
+ .formats = KIRKWOOD_I2S_FORMATS,},
+ .capture = {
+ .channels_min = 1,
+ .channels_max = 2,
+ .rates = KIRKWOOD_I2S_RATES,
+ .formats = KIRKWOOD_I2S_FORMATS,},
+ .ops = &kirkwood_i2s_dai_ops,
+};
+EXPORT_SYMBOL_GPL(kirkwood_i2s_dai);
+
+static __devinit int kirkwood_i2s_dev_probe(struct platform_device *pdev)
+{
+ struct resource *mem;
+ struct kirkwood_asoc_platform_data *data =
+ pdev->dev.platform_data;
+ int err;
+
+ priv = kzalloc(sizeof(struct kirkwood_dma_data), GFP_KERNEL);
+ if (!priv) {
+ dev_err(&pdev->dev, "allocation failed\n");
+ err = -ENOMEM;
+ goto error;
+ }
+
+ mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!mem) {
+ dev_err(&pdev->dev, "platform_get_resource failed\n");
+ err = -ENXIO;
+ goto err_alloc;
+ }
+
+ priv->mem = request_mem_region(mem->start, SZ_16K, DRV_NAME);
+ if (!priv->mem) {
+ dev_err(&pdev->dev, "request_mem_region failed\n");
+ err = -EBUSY;
+ goto error;
+ }
+
+ priv->io = ioremap(priv->mem->start, SZ_16K);
+ if (!priv->io) {
+ dev_err(&pdev->dev, "ioremap failed\n");
+ err = -ENOMEM;
+ goto err_iomem;
+ }
+
+ priv->irq = platform_get_irq(pdev, 0);
+ if (priv->irq <= 0) {
+ dev_err(&pdev->dev, "platform_get_irq failed\n");
+ err = -ENXIO;
+ goto err_ioremap;
+ }
+
+ if (!data || !data->dram) {
+ dev_err(&pdev->dev, "no platform data ?!\n");
+ err = -EINVAL;
+ goto err_ioremap;
+ }
+
+ priv->dram = data->dram;
+ priv->burst = data->burst;
+
+ kirkwood_i2s_dai.capture.dma_data = priv;
+ kirkwood_i2s_dai.playback.dma_data = priv;
+
+ return snd_soc_register_dai(&kirkwood_i2s_dai);
+
+err_ioremap:
+ iounmap(priv->io);
+err_iomem:
+ release_mem_region(priv->mem->start, SZ_16K);
+err_alloc:
+ kfree(priv);
+error:
+ return err;
+}
+
+static __devexit int kirkwood_i2s_dev_remove(struct platform_device *pdev)
+{
+ if (priv) {
+ iounmap(priv->io);
+ release_mem_region(priv->mem->start, SZ_16K);
+ kfree(priv);
+ }
+ snd_soc_unregister_dai(&kirkwood_i2s_dai);
+ return 0;
+}
+
+static struct platform_driver kirkwood_i2s_driver = {
+ .probe = kirkwood_i2s_dev_probe,
+ .remove = kirkwood_i2s_dev_remove,
+ .driver = {
+ .name = DRV_NAME,
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init kirkwood_i2s_init(void)
+{
+ return platform_driver_register(&kirkwood_i2s_driver);
+}
+module_init(kirkwood_i2s_init);
+
+static void __exit kirkwood_i2s_exit(void)
+{
+ platform_driver_unregister(&kirkwood_i2s_driver);
+}
+module_exit(kirkwood_i2s_exit);
+
+/* Module information */
+MODULE_AUTHOR("Arnaud Patard, <apatard@mandriva.com>");
+MODULE_DESCRIPTION("Kirkwood I2S SoC Interface");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:kirkwood-i2s");