tegra: sound: Add an I2S driver

Add a driver which supports transmitting digital sound to an audio codec.
This uses fixed parameters as a device-tree binding is not currently
defined.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>

3 files changed, 153 insertions, 1 deletions

diff --git a/drivers/sound/Makefile b/drivers/sound/Makefile
index 077012f..358d5f9 100644
--- a/drivers/sound/Makefile
+++ b/drivers/sound/Makefile
@@ -11,7 +11,7 @@ obj-$(CONFIG_I2S_SAMSUNG)	+= samsung-i2s.o
 obj-$(CONFIG_SOUND_SANDBOX)	+= sandbox.o
 obj-$(CONFIG_I2S_ROCKCHIP)	+= rockchip_i2s.o rockchip_sound.o
 obj-$(CONFIG_I2S_SAMSUNG)	+= samsung_sound.o
-obj-$(CONFIG_I2S_TEGRA)		+= tegra_ahub.o
+obj-$(CONFIG_I2S_TEGRA)		+= tegra_ahub.o tegra_i2s.o
 obj-$(CONFIG_SOUND_WM8994)	+= wm8994.o
 obj-$(CONFIG_SOUND_MAX98088)	+= max98088.o maxim_codec.o
 obj-$(CONFIG_SOUND_MAX98090)	+= max98090.o maxim_codec.o
diff --git a/drivers/sound/tegra_i2s.c b/drivers/sound/tegra_i2s.c
new file mode 100644
index 0000000..8022dbb
--- /dev/null
+++ b/drivers/sound/tegra_i2s.c
@@ -0,0 +1,123 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2018 Google LLC
+ * Written by Simon Glass <sjg@chromium.org>
+ */
+#define LOG_CATEGORY UCLASS_I2S
+#define LOG_DEBUG
+
+#include <common.h>
+#include <dm.h>
+#include <i2s.h>
+#include <misc.h>
+#include <sound.h>
+#include <asm/io.h>
+#include <asm/arch-tegra/tegra_i2s.h>
+#include "tegra_i2s_priv.h"
+
+int tegra_i2s_set_cif_tx_ctrl(struct udevice *dev, u32 value)
+{
+	struct i2s_uc_priv *priv = dev_get_uclass_priv(dev);
+	struct i2s_ctlr *regs = (struct i2s_ctlr *)priv->base_address;
+
+	writel(value, &regs->cif_tx_ctrl);
+
+	return 0;
+}
+
+static void tegra_i2s_transmit_enable(struct i2s_ctlr *regs, int on)
+{
+	clrsetbits_le32(&regs->ctrl, I2S_CTRL_XFER_EN_TX,
+			on ? I2S_CTRL_XFER_EN_TX : 0);
+}
+
+static int i2s_tx_init(struct i2s_uc_priv *pi2s_tx)
+{
+	struct i2s_ctlr *regs = (struct i2s_ctlr *)pi2s_tx->base_address;
+	u32 audio_bits = (pi2s_tx->bitspersample >> 2) - 1;
+	u32 ctrl = readl(&regs->ctrl);
+
+	/* Set format to LRCK / Left Low */
+	ctrl &= ~(I2S_CTRL_FRAME_FORMAT_MASK | I2S_CTRL_LRCK_MASK);
+	ctrl |= I2S_CTRL_FRAME_FORMAT_LRCK;
+	ctrl |= I2S_CTRL_LRCK_L_LOW;
+
+	/* Disable all transmission until we are ready to transfer */
+	ctrl &= ~(I2S_CTRL_XFER_EN_TX | I2S_CTRL_XFER_EN_RX);
+
+	/* Serve as master */
+	ctrl |= I2S_CTRL_MASTER_ENABLE;
+
+	/* Configure audio bits size */
+	ctrl &= ~I2S_CTRL_BIT_SIZE_MASK;
+	ctrl |= audio_bits << I2S_CTRL_BIT_SIZE_SHIFT;
+	writel(ctrl, &regs->ctrl);
+
+	/* Timing in LRCK mode: */
+	writel(pi2s_tx->bitspersample, &regs->timing);
+
+	/* I2S mode has [TX/RX]_DATA_OFFSET both set to 1 */
+	writel(((1 << I2S_OFFSET_RX_DATA_OFFSET_SHIFT) |
+		(1 << I2S_OFFSET_TX_DATA_OFFSET_SHIFT)), &regs->offset);
+
+	/* FSYNC_WIDTH = 2 clocks wide, TOTAL_SLOTS = 2 slots per fsync */
+	writel((2 - 1) << I2S_CH_CTRL_FSYNC_WIDTH_SHIFT, &regs->ch_ctrl);
+
+	return 0;
+}
+
+static int tegra_i2s_tx_data(struct udevice *dev, void *data, uint data_size)
+{
+	struct i2s_uc_priv *priv = dev_get_uclass_priv(dev);
+	struct i2s_ctlr *regs = (struct i2s_ctlr *)priv->base_address;
+	int ret;
+
+	tegra_i2s_transmit_enable(regs, 1);
+	ret = misc_write(dev_get_parent(dev), 0, data, data_size);
+	tegra_i2s_transmit_enable(regs, 0);
+	if (ret < 0)
+		return ret;
+	else if (ret < data_size)
+		return -EIO;
+
+	return 0;
+}
+
+static int tegra_i2s_probe(struct udevice *dev)
+{
+	struct i2s_uc_priv *priv = dev_get_uclass_priv(dev);
+	ulong base;
+
+	base = dev_read_addr(dev);
+	if (base == FDT_ADDR_T_NONE) {
+		debug("%s: Missing i2s base\n", __func__);
+		return -EINVAL;
+	}
+	priv->base_address = base;
+	priv->id = 1;
+	priv->audio_pll_clk = 4800000;
+	priv->samplingrate = 48000;
+	priv->bitspersample = 16;
+	priv->channels = 2;
+	priv->rfs = 256;
+	priv->bfs = 32;
+
+	return i2s_tx_init(priv);
+}
+
+static const struct i2s_ops tegra_i2s_ops = {
+	.tx_data	= tegra_i2s_tx_data,
+};
+
+static const struct udevice_id tegra_i2s_ids[] = {
+	{ .compatible = "nvidia,tegra124-i2s" },
+	{ }
+};
+
+U_BOOT_DRIVER(tegra_i2s) = {
+	.name		= "tegra_i2s",
+	.id		= UCLASS_I2S,
+	.of_match	= tegra_i2s_ids,
+	.probe		= tegra_i2s_probe,
+	.ops		= &tegra_i2s_ops,
+};
diff --git a/drivers/sound/tegra_i2s_priv.h b/drivers/sound/tegra_i2s_priv.h
new file mode 100644
index 0000000..7cd3fc8
--- /dev/null
+++ b/drivers/sound/tegra_i2s_priv.h
@@ -0,0 +1,29 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright 2018 Google LLC
+ * Written by Simon Glass <sjg@chromium.org>
+ */
+
+#ifndef __TEGRA_I2S_PRIV_H
+#define __TEGRA_I2S_PRIV_H
+
+enum {
+	/* Set i2s device (in buf) */
+	AHUB_MISCOP_SET_I2S,
+};
+
+/*
+ * tegra_i2s_set_cif_tx_ctrl() - Set the I2C port to send to
+ *
+ * The CIF is not really part of I2S -- it's for Audio Hub to control
+ * the interface between I2S and Audio Hub.  However since it's put in
+ * the I2S registers domain instead of the Audio Hub, we need to export
+ * this as a function.
+ *
+ * @dev: I2S device
+ * @value: Value to write to CIF_TX_CTRL register
+ * @return 0
+ */
+int tegra_i2s_set_cif_tx_ctrl(struct udevice *dev, u32 value);
+
+#endif