1 files changed, 459 insertions, 0 deletions

diff --git a/sound/soc/tegra/tegra_i2s.c b/sound/soc/tegra/tegra_i2s.c
new file mode 100644
index 00000000..e5334991
--- /dev/null
+++ b/sound/soc/tegra/tegra_i2s.c
@@ -0,0 +1,459 @@
+/*
+ * tegra_i2s.c - Tegra I2S driver
+ *
+ * Author: Stephen Warren <swarren@nvidia.com>
+ * Copyright (C) 2010 - NVIDIA, Inc.
+ *
+ * Based on code copyright/by:
+ *
+ * Copyright (c) 2009-2010, NVIDIA Corporation.
+ * Scott Peterson <speterson@nvidia.com>
+ *
+ * Copyright (C) 2010 Google, Inc.
+ * Iliyan Malchev <malchev@google.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.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+#include <linux/clk.h>
+#include <linux/module.h>
+#include <linux/debugfs.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <mach/iomap.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+
+#include "tegra_i2s.h"
+
+#define DRV_NAME "tegra-i2s"
+
+static inline void tegra_i2s_write(struct tegra_i2s *i2s, u32 reg, u32 val)
+{
+	__raw_writel(val, i2s->regs + reg);
+}
+
+static inline u32 tegra_i2s_read(struct tegra_i2s *i2s, u32 reg)
+{
+	return __raw_readl(i2s->regs + reg);
+}
+
+#ifdef CONFIG_DEBUG_FS
+static int tegra_i2s_show(struct seq_file *s, void *unused)
+{
+#define REG(r) { r, #r }
+	static const struct {
+		int offset;
+		const char *name;
+	} regs[] = {
+		REG(TEGRA_I2S_CTRL),
+		REG(TEGRA_I2S_STATUS),
+		REG(TEGRA_I2S_TIMING),
+		REG(TEGRA_I2S_FIFO_SCR),
+		REG(TEGRA_I2S_PCM_CTRL),
+		REG(TEGRA_I2S_NW_CTRL),
+		REG(TEGRA_I2S_TDM_CTRL),
+		REG(TEGRA_I2S_TDM_TX_RX_CTRL),
+	};
+#undef REG
+
+	struct tegra_i2s *i2s = s->private;
+	int i;
+
+	clk_enable(i2s->clk_i2s);
+
+	for (i = 0; i < ARRAY_SIZE(regs); i++) {
+		u32 val = tegra_i2s_read(i2s, regs[i].offset);
+		seq_printf(s, "%s = %08x\n", regs[i].name, val);
+	}
+
+	clk_disable(i2s->clk_i2s);
+
+	return 0;
+}
+
+static int tegra_i2s_debug_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, tegra_i2s_show, inode->i_private);
+}
+
+static const struct file_operations tegra_i2s_debug_fops = {
+	.open    = tegra_i2s_debug_open,
+	.read    = seq_read,
+	.llseek  = seq_lseek,
+	.release = single_release,
+};
+
+static void tegra_i2s_debug_add(struct tegra_i2s *i2s)
+{
+	i2s->debug = debugfs_create_file(i2s->dai.name, S_IRUGO,
+					 snd_soc_debugfs_root, i2s,
+					 &tegra_i2s_debug_fops);
+}
+
+static void tegra_i2s_debug_remove(struct tegra_i2s *i2s)
+{
+	if (i2s->debug)
+		debugfs_remove(i2s->debug);
+}
+#else
+static inline void tegra_i2s_debug_add(struct tegra_i2s *i2s)
+{
+}
+
+static inline void tegra_i2s_debug_remove(struct tegra_i2s *i2s)
+{
+}
+#endif
+
+static int tegra_i2s_set_fmt(struct snd_soc_dai *dai,
+				unsigned int fmt)
+{
+	struct tegra_i2s *i2s = snd_soc_dai_get_drvdata(dai);
+
+	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
+	case SND_SOC_DAIFMT_NB_NF:
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	i2s->reg_ctrl &= ~TEGRA_I2S_CTRL_MASTER_ENABLE;
+	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
+	case SND_SOC_DAIFMT_CBS_CFS:
+		i2s->reg_ctrl |= TEGRA_I2S_CTRL_MASTER_ENABLE;
+		break;
+	case SND_SOC_DAIFMT_CBM_CFM:
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	i2s->reg_ctrl &= ~(TEGRA_I2S_CTRL_BIT_FORMAT_MASK | 
+				TEGRA_I2S_CTRL_LRCK_MASK);
+	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
+	case SND_SOC_DAIFMT_DSP_A:
+		i2s->reg_ctrl |= TEGRA_I2S_CTRL_BIT_FORMAT_DSP;
+		i2s->reg_ctrl |= TEGRA_I2S_CTRL_LRCK_L_LOW;
+		break;
+	case SND_SOC_DAIFMT_DSP_B:
+		i2s->reg_ctrl |= TEGRA_I2S_CTRL_BIT_FORMAT_DSP;
+		i2s->reg_ctrl |= TEGRA_I2S_CTRL_LRCK_R_LOW;
+		break;
+	case SND_SOC_DAIFMT_I2S:
+		i2s->reg_ctrl |= TEGRA_I2S_CTRL_BIT_FORMAT_I2S;
+		i2s->reg_ctrl |= TEGRA_I2S_CTRL_LRCK_L_LOW;
+		break;
+	case SND_SOC_DAIFMT_RIGHT_J:
+		i2s->reg_ctrl |= TEGRA_I2S_CTRL_BIT_FORMAT_RJM;
+		i2s->reg_ctrl |= TEGRA_I2S_CTRL_LRCK_L_LOW;
+		break;
+	case SND_SOC_DAIFMT_LEFT_J:
+		i2s->reg_ctrl |= TEGRA_I2S_CTRL_BIT_FORMAT_LJM;
+		i2s->reg_ctrl |= TEGRA_I2S_CTRL_LRCK_L_LOW;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int tegra_i2s_hw_params(struct snd_pcm_substream *substream,
+				struct snd_pcm_hw_params *params,
+				struct snd_soc_dai *dai)
+{
+        struct device *dev = substream->pcm->card->dev;
+	struct tegra_i2s *i2s = snd_soc_dai_get_drvdata(dai);
+	u32 reg;
+	int ret, sample_size, srate, i2sclock, bitcnt;
+
+	i2s->reg_ctrl &= ~TEGRA_I2S_CTRL_BIT_SIZE_MASK;
+	switch (params_format(params)) {
+	case SNDRV_PCM_FORMAT_S16_LE:
+		i2s->reg_ctrl |= TEGRA_I2S_CTRL_BIT_SIZE_16;
+		sample_size = 16;
+		break;
+	case SNDRV_PCM_FORMAT_S24_LE:
+		i2s->reg_ctrl |= TEGRA_I2S_CTRL_BIT_SIZE_24;
+		sample_size = 24;
+		break;
+	case SNDRV_PCM_FORMAT_S32_LE:
+		i2s->reg_ctrl |= TEGRA_I2S_CTRL_BIT_SIZE_32;
+		sample_size = 32;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	srate = params_rate(params);
+
+	/* Final "* 2" required by Tegra hardware */
+	i2sclock = srate * params_channels(params) * sample_size * 2;
+
+	ret = clk_set_rate(i2s->clk_i2s, i2sclock);
+	if (ret) {
+		dev_err(dev, "Can't set I2S clock rate: %d\n", ret);
+		return ret;
+	}
+
+	bitcnt = (i2sclock / (2 * srate)) - 1;
+	if (bitcnt < 0 || bitcnt > TEGRA_I2S_TIMING_CHANNEL_BIT_COUNT_MASK_US)
+		return -EINVAL;
+	reg = bitcnt << TEGRA_I2S_TIMING_CHANNEL_BIT_COUNT_SHIFT;
+
+	if (i2sclock % (2 * srate))
+		reg |= TEGRA_I2S_TIMING_NON_SYM_ENABLE;
+
+	if (!i2s->clk_refs)
+		clk_enable(i2s->clk_i2s);
+
+	tegra_i2s_write(i2s, TEGRA_I2S_TIMING, reg);
+
+	tegra_i2s_write(i2s, TEGRA_I2S_FIFO_SCR,
+		TEGRA_I2S_FIFO_SCR_FIFO2_ATN_LVL_FOUR_SLOTS |
+		TEGRA_I2S_FIFO_SCR_FIFO1_ATN_LVL_FOUR_SLOTS);
+
+	if (!i2s->clk_refs)
+		clk_disable(i2s->clk_i2s);
+
+	return 0;
+}
+
+static void tegra_i2s_start_playback(struct tegra_i2s *i2s)
+{
+	i2s->reg_ctrl |= TEGRA_I2S_CTRL_FIFO1_ENABLE;
+	tegra_i2s_write(i2s, TEGRA_I2S_CTRL, i2s->reg_ctrl);
+}
+
+static void tegra_i2s_stop_playback(struct tegra_i2s *i2s)
+{
+	i2s->reg_ctrl &= ~TEGRA_I2S_CTRL_FIFO1_ENABLE;
+	tegra_i2s_write(i2s, TEGRA_I2S_CTRL, i2s->reg_ctrl);
+}
+
+static void tegra_i2s_start_capture(struct tegra_i2s *i2s)
+{
+	i2s->reg_ctrl |= TEGRA_I2S_CTRL_FIFO2_ENABLE;
+	tegra_i2s_write(i2s, TEGRA_I2S_CTRL, i2s->reg_ctrl);
+}
+
+static void tegra_i2s_stop_capture(struct tegra_i2s *i2s)
+{
+	i2s->reg_ctrl &= ~TEGRA_I2S_CTRL_FIFO2_ENABLE;
+	tegra_i2s_write(i2s, TEGRA_I2S_CTRL, i2s->reg_ctrl);
+}
+
+static int tegra_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
+				struct snd_soc_dai *dai)
+{
+	struct tegra_i2s *i2s = snd_soc_dai_get_drvdata(dai);
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+	case SNDRV_PCM_TRIGGER_RESUME:
+		if (!i2s->clk_refs)
+			clk_enable(i2s->clk_i2s);
+		i2s->clk_refs++;
+		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+			tegra_i2s_start_playback(i2s);
+		else
+			tegra_i2s_start_capture(i2s);
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+			tegra_i2s_stop_playback(i2s);
+		else
+			tegra_i2s_stop_capture(i2s);
+		i2s->clk_refs--;
+		if (!i2s->clk_refs)
+			clk_disable(i2s->clk_i2s);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int tegra_i2s_probe(struct snd_soc_dai *dai)
+{
+	struct tegra_i2s * i2s = snd_soc_dai_get_drvdata(dai);
+
+	dai->capture_dma_data = &i2s->capture_dma_data;
+	dai->playback_dma_data = &i2s->playback_dma_data;
+
+	return 0;
+}
+
+static const struct snd_soc_dai_ops tegra_i2s_dai_ops = {
+	.set_fmt	= tegra_i2s_set_fmt,
+	.hw_params	= tegra_i2s_hw_params,
+	.trigger	= tegra_i2s_trigger,
+};
+
+static const struct snd_soc_dai_driver tegra_i2s_dai_template = {
+	.probe = tegra_i2s_probe,
+	.playback = {
+		.channels_min = 2,
+		.channels_max = 2,
+		.rates = SNDRV_PCM_RATE_8000_96000,
+		.formats = SNDRV_PCM_FMTBIT_S16_LE,
+	},
+	.capture = {
+		.channels_min = 2,
+		.channels_max = 2,
+		.rates = SNDRV_PCM_RATE_8000_96000,
+		.formats = SNDRV_PCM_FMTBIT_S16_LE,
+	},
+	.ops = &tegra_i2s_dai_ops,
+	.symmetric_rates = 1,
+};
+
+static __devinit int tegra_i2s_platform_probe(struct platform_device *pdev)
+{
+	struct tegra_i2s * i2s;
+	struct resource *mem, *memregion, *dmareq;
+	u32 of_dma[2];
+	u32 dma_ch;
+	int ret;
+
+	i2s = devm_kzalloc(&pdev->dev, sizeof(struct tegra_i2s), GFP_KERNEL);
+	if (!i2s) {
+		dev_err(&pdev->dev, "Can't allocate tegra_i2s\n");
+		ret = -ENOMEM;
+		goto err;
+	}
+	dev_set_drvdata(&pdev->dev, i2s);
+
+	i2s->dai = tegra_i2s_dai_template;
+	i2s->dai.name = dev_name(&pdev->dev);
+
+	i2s->clk_i2s = clk_get(&pdev->dev, NULL);
+	if (IS_ERR(i2s->clk_i2s)) {
+		dev_err(&pdev->dev, "Can't retrieve i2s clock\n");
+		ret = PTR_ERR(i2s->clk_i2s);
+		goto err;
+	}
+
+	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!mem) {
+		dev_err(&pdev->dev, "No memory resource\n");
+		ret = -ENODEV;
+		goto err_clk_put;
+	}
+
+	dmareq = platform_get_resource(pdev, IORESOURCE_DMA, 0);
+	if (!dmareq) {
+		if (of_property_read_u32_array(pdev->dev.of_node,
+					"nvidia,dma-request-selector",
+					of_dma, 2) < 0) {
+			dev_err(&pdev->dev, "No DMA resource\n");
+			ret = -ENODEV;
+			goto err_clk_put;
+		}
+		dma_ch = of_dma[1];
+	} else {
+		dma_ch = dmareq->start;
+	}
+
+	memregion = devm_request_mem_region(&pdev->dev, mem->start,
+					    resource_size(mem), DRV_NAME);
+	if (!memregion) {
+		dev_err(&pdev->dev, "Memory region already claimed\n");
+		ret = -EBUSY;
+		goto err_clk_put;
+	}
+
+	i2s->regs = devm_ioremap(&pdev->dev, mem->start, resource_size(mem));
+	if (!i2s->regs) {
+		dev_err(&pdev->dev, "ioremap failed\n");
+		ret = -ENOMEM;
+		goto err_clk_put;
+	}
+
+	i2s->capture_dma_data.addr = mem->start + TEGRA_I2S_FIFO2;
+	i2s->capture_dma_data.wrap = 4;
+	i2s->capture_dma_data.width = 32;
+	i2s->capture_dma_data.req_sel = dma_ch;
+
+	i2s->playback_dma_data.addr = mem->start + TEGRA_I2S_FIFO1;
+	i2s->playback_dma_data.wrap = 4;
+	i2s->playback_dma_data.width = 32;
+	i2s->playback_dma_data.req_sel = dma_ch;
+
+	i2s->reg_ctrl = TEGRA_I2S_CTRL_FIFO_FORMAT_PACKED;
+
+	ret = snd_soc_register_dai(&pdev->dev, &i2s->dai);
+	if (ret) {
+		dev_err(&pdev->dev, "Could not register DAI: %d\n", ret);
+		ret = -ENOMEM;
+		goto err_clk_put;
+	}
+
+	tegra_i2s_debug_add(i2s);
+
+	return 0;
+
+err_clk_put:
+	clk_put(i2s->clk_i2s);
+err:
+	return ret;
+}
+
+static int __devexit tegra_i2s_platform_remove(struct platform_device *pdev)
+{
+	struct tegra_i2s *i2s = dev_get_drvdata(&pdev->dev);
+
+	snd_soc_unregister_dai(&pdev->dev);
+
+	tegra_i2s_debug_remove(i2s);
+
+	clk_put(i2s->clk_i2s);
+
+	return 0;
+}
+
+static const struct of_device_id tegra_i2s_of_match[] __devinitconst = {
+	{ .compatible = "nvidia,tegra20-i2s", },
+	{},
+};
+
+static struct platform_driver tegra_i2s_driver = {
+	.driver = {
+		.name = DRV_NAME,
+		.owner = THIS_MODULE,
+		.of_match_table = tegra_i2s_of_match,
+	},
+	.probe = tegra_i2s_platform_probe,
+	.remove = __devexit_p(tegra_i2s_platform_remove),
+};
+module_platform_driver(tegra_i2s_driver);
+
+MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
+MODULE_DESCRIPTION("Tegra I2S ASoC driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DRV_NAME);
+MODULE_DEVICE_TABLE(of, tegra_i2s_of_match);