[ALSA] Davinci ASoC support

Add ASoC support for the TI Davinci SoC and the Davicni-EVM reference board.
It includes:
- ASoC Davinci DMA driver
- ASoC Davinci I2S (Davinci McBSP module based) driver
- ASoC Davinci-EVM reference board

Signed-off-by: Vladimir Barinov <vbarinov@ru.mvista.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 407 insertions, 0 deletions

diff --git a/sound/soc/davinci/davinci-i2s.c b/sound/soc/davinci/davinci-i2s.c
new file mode 100644
index 00000000000..c421774b33e
--- /dev/null
+++ b/sound/soc/davinci/davinci-i2s.c
@@ -0,0 +1,407 @@
+/*
+ * ALSA SoC I2S (McBSP) Audio Layer for TI DAVINCI processor
+ *
+ * Author:      Vladimir Barinov, <vbarinov@ru.mvista.com>
+ * Copyright:   (C) 2007 MontaVista Software, Inc., <source@mvista.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.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/clk.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/initval.h>
+#include <sound/soc.h>
+
+#include "davinci-pcm.h"
+
+#define DAVINCI_MCBSP_DRR_REG	0x00
+#define DAVINCI_MCBSP_DXR_REG	0x04
+#define DAVINCI_MCBSP_SPCR_REG	0x08
+#define DAVINCI_MCBSP_RCR_REG	0x0c
+#define DAVINCI_MCBSP_XCR_REG	0x10
+#define DAVINCI_MCBSP_SRGR_REG	0x14
+#define DAVINCI_MCBSP_PCR_REG	0x24
+
+#define DAVINCI_MCBSP_SPCR_RRST		(1 << 0)
+#define DAVINCI_MCBSP_SPCR_RINTM(v)	((v) << 4)
+#define DAVINCI_MCBSP_SPCR_XRST		(1 << 16)
+#define DAVINCI_MCBSP_SPCR_XINTM(v)	((v) << 20)
+#define DAVINCI_MCBSP_SPCR_GRST		(1 << 22)
+#define DAVINCI_MCBSP_SPCR_FRST		(1 << 23)
+#define DAVINCI_MCBSP_SPCR_FREE		(1 << 25)
+
+#define DAVINCI_MCBSP_RCR_RWDLEN1(v)	((v) << 5)
+#define DAVINCI_MCBSP_RCR_RFRLEN1(v)	((v) << 8)
+#define DAVINCI_MCBSP_RCR_RDATDLY(v)	((v) << 16)
+#define DAVINCI_MCBSP_RCR_RWDLEN2(v)	((v) << 21)
+
+#define DAVINCI_MCBSP_XCR_XWDLEN1(v)	((v) << 5)
+#define DAVINCI_MCBSP_XCR_XFRLEN1(v)	((v) << 8)
+#define DAVINCI_MCBSP_XCR_XDATDLY(v)	((v) << 16)
+#define DAVINCI_MCBSP_XCR_XFIG		(1 << 18)
+#define DAVINCI_MCBSP_XCR_XWDLEN2(v)	((v) << 21)
+
+#define DAVINCI_MCBSP_SRGR_FWID(v)	((v) << 8)
+#define DAVINCI_MCBSP_SRGR_FPER(v)	((v) << 16)
+#define DAVINCI_MCBSP_SRGR_FSGM		(1 << 28)
+
+#define DAVINCI_MCBSP_PCR_CLKRP		(1 << 0)
+#define DAVINCI_MCBSP_PCR_CLKXP		(1 << 1)
+#define DAVINCI_MCBSP_PCR_FSRP		(1 << 2)
+#define DAVINCI_MCBSP_PCR_FSXP		(1 << 3)
+#define DAVINCI_MCBSP_PCR_CLKRM		(1 << 8)
+#define DAVINCI_MCBSP_PCR_CLKXM		(1 << 9)
+#define DAVINCI_MCBSP_PCR_FSRM		(1 << 10)
+#define DAVINCI_MCBSP_PCR_FSXM		(1 << 11)
+
+#define MOD_REG_BIT(val, mask, set) do { \
+	if (set) { \
+		val |= mask; \
+	} else { \
+		val &= ~mask; \
+	} \
+} while (0)
+
+enum {
+	DAVINCI_MCBSP_WORD_8 = 0,
+	DAVINCI_MCBSP_WORD_12,
+	DAVINCI_MCBSP_WORD_16,
+	DAVINCI_MCBSP_WORD_20,
+	DAVINCI_MCBSP_WORD_24,
+	DAVINCI_MCBSP_WORD_32,
+};
+
+static struct davinci_pcm_dma_params davinci_i2s_pcm_out = {
+	.name = "I2S PCM Stereo out",
+};
+
+static struct davinci_pcm_dma_params davinci_i2s_pcm_in = {
+	.name = "I2S PCM Stereo in",
+};
+
+struct davinci_mcbsp_dev {
+	void __iomem			*base;
+	struct clk			*clk;
+	struct davinci_pcm_dma_params	*dma_params[2];
+};
+
+static inline void davinci_mcbsp_write_reg(struct davinci_mcbsp_dev *dev,
+					   int reg, u32 val)
+{
+	__raw_writel(val, dev->base + reg);
+}
+
+static inline u32 davinci_mcbsp_read_reg(struct davinci_mcbsp_dev *dev, int reg)
+{
+	return __raw_readl(dev->base + reg);
+}
+
+static void davinci_mcbsp_start(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct davinci_mcbsp_dev *dev = rtd->dai->cpu_dai->private_data;
+	u32 w;
+
+	/* Start the sample generator and enable transmitter/receiver */
+	w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG);
+	MOD_REG_BIT(w, DAVINCI_MCBSP_SPCR_GRST, 1);
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+		MOD_REG_BIT(w, DAVINCI_MCBSP_SPCR_XRST, 1);
+	else
+		MOD_REG_BIT(w, DAVINCI_MCBSP_SPCR_RRST, 1);
+	davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, w);
+
+	/* Start frame sync */
+	w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG);
+	MOD_REG_BIT(w, DAVINCI_MCBSP_SPCR_FRST, 1);
+	davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, w);
+}
+
+static void davinci_mcbsp_stop(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct davinci_mcbsp_dev *dev = rtd->dai->cpu_dai->private_data;
+	u32 w;
+
+	/* Reset transmitter/receiver and sample rate/frame sync generators */
+	w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG);
+	MOD_REG_BIT(w, DAVINCI_MCBSP_SPCR_GRST |
+		       DAVINCI_MCBSP_SPCR_FRST, 0);
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+		MOD_REG_BIT(w, DAVINCI_MCBSP_SPCR_XRST, 0);
+	else
+		MOD_REG_BIT(w, DAVINCI_MCBSP_SPCR_RRST, 0);
+	davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, w);
+}
+
+static int davinci_i2s_startup(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_cpu_dai *cpu_dai = rtd->dai->cpu_dai;
+	struct davinci_mcbsp_dev *dev = rtd->dai->cpu_dai->private_data;
+
+	cpu_dai->dma_data = dev->dma_params[substream->stream];
+
+	return 0;
+}
+
+static int davinci_i2s_set_dai_fmt(struct snd_soc_cpu_dai *cpu_dai,
+				   unsigned int fmt)
+{
+	struct davinci_mcbsp_dev *dev = cpu_dai->private_data;
+	u32 w;
+
+	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
+	case SND_SOC_DAIFMT_CBS_CFS:
+		davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_PCR_REG,
+					DAVINCI_MCBSP_PCR_FSXM |
+					DAVINCI_MCBSP_PCR_FSRM |
+					DAVINCI_MCBSP_PCR_CLKXM |
+					DAVINCI_MCBSP_PCR_CLKRM);
+		davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SRGR_REG,
+					DAVINCI_MCBSP_SRGR_FSGM);
+		break;
+	case SND_SOC_DAIFMT_CBM_CFM:
+		davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_PCR_REG, 0);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
+	case SND_SOC_DAIFMT_IB_NF:
+		w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_PCR_REG);
+		MOD_REG_BIT(w, DAVINCI_MCBSP_PCR_CLKXP |
+			       DAVINCI_MCBSP_PCR_CLKRP, 1);
+		davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_PCR_REG, w);
+		break;
+	case SND_SOC_DAIFMT_NB_IF:
+		w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_PCR_REG);
+		MOD_REG_BIT(w, DAVINCI_MCBSP_PCR_FSXP |
+			       DAVINCI_MCBSP_PCR_FSRP, 1);
+		davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_PCR_REG, w);
+		break;
+	case SND_SOC_DAIFMT_IB_IF:
+		w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_PCR_REG);
+		MOD_REG_BIT(w, DAVINCI_MCBSP_PCR_CLKXP |
+			       DAVINCI_MCBSP_PCR_CLKRP |
+			       DAVINCI_MCBSP_PCR_FSXP |
+			       DAVINCI_MCBSP_PCR_FSRP, 1);
+		davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_PCR_REG, w);
+		break;
+	case SND_SOC_DAIFMT_NB_NF:
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int davinci_i2s_hw_params(struct snd_pcm_substream *substream,
+				 struct snd_pcm_hw_params *params)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct davinci_pcm_dma_params *dma_params = rtd->dai->cpu_dai->dma_data;
+	struct davinci_mcbsp_dev *dev = rtd->dai->cpu_dai->private_data;
+	struct snd_interval *i = NULL;
+	int mcbsp_word_length;
+	u32 w;
+
+	/* general line settings */
+	davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG,
+				DAVINCI_MCBSP_SPCR_RINTM(3) |
+				DAVINCI_MCBSP_SPCR_XINTM(3) |
+				DAVINCI_MCBSP_SPCR_FREE);
+	davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_RCR_REG,
+				DAVINCI_MCBSP_RCR_RFRLEN1(1) |
+				DAVINCI_MCBSP_RCR_RDATDLY(1));
+	davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_XCR_REG,
+				DAVINCI_MCBSP_XCR_XFRLEN1(1) |
+				DAVINCI_MCBSP_XCR_XDATDLY(1) |
+				DAVINCI_MCBSP_XCR_XFIG);
+
+	i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
+	w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SRGR_REG);
+	MOD_REG_BIT(w, DAVINCI_MCBSP_SRGR_FWID(snd_interval_value(i) - 1), 1);
+	davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SRGR_REG, w);
+
+	i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_FRAME_BITS);
+	w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SRGR_REG);
+	MOD_REG_BIT(w, DAVINCI_MCBSP_SRGR_FPER(snd_interval_value(i) - 1), 1);
+	davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SRGR_REG, w);
+
+	/* Determine xfer data type */
+	switch (params_format(params)) {
+	case SNDRV_PCM_FORMAT_S8:
+		dma_params->data_type = 1;
+		mcbsp_word_length = DAVINCI_MCBSP_WORD_8;
+		break;
+	case SNDRV_PCM_FORMAT_S16_LE:
+		dma_params->data_type = 2;
+		mcbsp_word_length = DAVINCI_MCBSP_WORD_16;
+		break;
+	case SNDRV_PCM_FORMAT_S32_LE:
+		dma_params->data_type = 4;
+		mcbsp_word_length = DAVINCI_MCBSP_WORD_32;
+		break;
+	default:
+		printk(KERN_WARNING "davinci-i2s: unsupported PCM format");
+		return -EINVAL;
+	}
+
+	w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_RCR_REG);
+	MOD_REG_BIT(w, DAVINCI_MCBSP_RCR_RWDLEN1(mcbsp_word_length) |
+		       DAVINCI_MCBSP_RCR_RWDLEN2(mcbsp_word_length), 1);
+	davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_RCR_REG, w);
+
+	w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_XCR_REG);
+	MOD_REG_BIT(w, DAVINCI_MCBSP_XCR_XWDLEN1(mcbsp_word_length) |
+		       DAVINCI_MCBSP_XCR_XWDLEN2(mcbsp_word_length), 1);
+	davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_XCR_REG, w);
+
+	return 0;
+}
+
+static int davinci_i2s_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+	int ret = 0;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_RESUME:
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		davinci_mcbsp_start(substream);
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		davinci_mcbsp_stop(substream);
+		break;
+	default:
+		ret = -EINVAL;
+	}
+
+	return ret;
+}
+
+static int davinci_i2s_probe(struct platform_device *pdev)
+{
+	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+	struct snd_soc_machine *machine = socdev->machine;
+	struct snd_soc_cpu_dai *cpu_dai = machine->dai_link[pdev->id].cpu_dai;
+	struct davinci_mcbsp_dev *dev;
+	struct resource *mem, *ioarea;
+	struct evm_snd_platform_data *pdata;
+	int ret;
+
+	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!mem) {
+		dev_err(&pdev->dev, "no mem resource?\n");
+		return -ENODEV;
+	}
+
+	ioarea = request_mem_region(mem->start, (mem->end - mem->start) + 1,
+				    pdev->name);
+	if (!ioarea) {
+		dev_err(&pdev->dev, "McBSP region already claimed\n");
+		return -EBUSY;
+	}
+
+	dev = kzalloc(sizeof(struct davinci_mcbsp_dev), GFP_KERNEL);
+	if (!dev) {
+		ret = -ENOMEM;
+		goto err_release_region;
+	}
+
+	cpu_dai->private_data = dev;
+
+	dev->clk = clk_get(&pdev->dev, "McBSPCLK");
+	if (IS_ERR(dev->clk)) {
+		ret = -ENODEV;
+		goto err_free_mem;
+	}
+	clk_enable(dev->clk);
+
+	dev->base = (void __iomem *)IO_ADDRESS(mem->start);
+	pdata = pdev->dev.platform_data;
+
+	dev->dma_params[SNDRV_PCM_STREAM_PLAYBACK] = &davinci_i2s_pcm_out;
+	dev->dma_params[SNDRV_PCM_STREAM_PLAYBACK]->channel = pdata->tx_dma_ch;
+	dev->dma_params[SNDRV_PCM_STREAM_PLAYBACK]->dma_addr =
+	    (dma_addr_t)(io_v2p(dev->base) + DAVINCI_MCBSP_DXR_REG);
+
+	dev->dma_params[SNDRV_PCM_STREAM_CAPTURE] = &davinci_i2s_pcm_in;
+	dev->dma_params[SNDRV_PCM_STREAM_CAPTURE]->channel = pdata->rx_dma_ch;
+	dev->dma_params[SNDRV_PCM_STREAM_CAPTURE]->dma_addr =
+	    (dma_addr_t)(io_v2p(dev->base) + DAVINCI_MCBSP_DRR_REG);
+
+	return 0;
+
+err_free_mem:
+	kfree(dev);
+err_release_region:
+	release_mem_region(mem->start, (mem->end - mem->start) + 1);
+
+	return ret;
+}
+
+static void davinci_i2s_remove(struct platform_device *pdev)
+{
+	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+	struct snd_soc_machine *machine = socdev->machine;
+	struct snd_soc_cpu_dai *cpu_dai = machine->dai_link[pdev->id].cpu_dai;
+	struct davinci_mcbsp_dev *dev = cpu_dai->private_data;
+	struct resource *mem;
+
+	clk_disable(dev->clk);
+	clk_put(dev->clk);
+	dev->clk = NULL;
+
+	kfree(dev);
+
+	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	release_mem_region(mem->start, (mem->end - mem->start) + 1);
+}
+
+#define DAVINCI_I2S_RATES	SNDRV_PCM_RATE_8000_96000
+
+struct snd_soc_cpu_dai davinci_i2s_dai = {
+	.name = "davinci-i2s",
+	.id = 0,
+	.type = SND_SOC_DAI_I2S,
+	.probe = davinci_i2s_probe,
+	.remove = davinci_i2s_remove,
+	.playback = {
+		.channels_min = 2,
+		.channels_max = 2,
+		.rates = DAVINCI_I2S_RATES,
+		.formats = SNDRV_PCM_FMTBIT_S16_LE,},
+	.capture = {
+		.channels_min = 2,
+		.channels_max = 2,
+		.rates = DAVINCI_I2S_RATES,
+		.formats = SNDRV_PCM_FMTBIT_S16_LE,},
+	.ops = {
+		.startup = davinci_i2s_startup,
+		.trigger = davinci_i2s_trigger,
+		.hw_params = davinci_i2s_hw_params,},
+	.dai_ops = {
+		.set_fmt = davinci_i2s_set_dai_fmt,
+	},
+};
+EXPORT_SYMBOL_GPL(davinci_i2s_dai);
+
+MODULE_AUTHOR("Vladimir Barinov");
+MODULE_DESCRIPTION("TI DAVINCI I2S (McBSP) SoC Interface");
+MODULE_LICENSE("GPL");