Add submodule dependency filesHEADmaster

Change-Id: Iaf8d18082d3991dec7c0ebbea540f092188eb4ec

1 files changed, 274 insertions, 0 deletions

diff --git a/roms/u-boot/drivers/i2c/rcar_iic.c b/roms/u-boot/drivers/i2c/rcar_iic.c
new file mode 100644
index 000000000..f0e50914c
--- /dev/null
+++ b/roms/u-boot/drivers/i2c/rcar_iic.c
@@ -0,0 +1,274 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Renesas RCar IIC driver
+ *
+ * Copyright (C) 2017 Marek Vasut <marek.vasut@gmail.com>
+ *
+ * Based on
+ * Copyright (C) 2011, 2013 Renesas Solutions Corp.
+ * Copyright (C) 2011, 2013 Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
+ */
+
+#include <common.h>
+#include <clk.h>
+#include <dm.h>
+#include <i2c.h>
+#include <asm/io.h>
+#include <linux/bitops.h>
+#include <linux/delay.h>
+
+struct rcar_iic_priv {
+	void __iomem		*base;
+	struct clk		clk;
+	u8			iccl;
+	u8			icch;
+};
+
+#define RCAR_IIC_ICDR		0x00
+#define RCAR_IIC_ICCR		0x04
+#define RCAR_IIC_ICSR		0x08
+#define RCAR_IIC_ICIC		0x0c
+#define RCAR_IIC_ICCL		0x10
+#define RCAR_IIC_ICCH		0x14
+
+/* ICCR */
+#define RCAR_IIC_ICCR_ICE	BIT(7)
+#define RCAR_IIC_ICCR_RACK	BIT(6)
+#define RCAR_IIC_ICCR_RTS	BIT(4)
+#define RCAR_IIC_ICCR_BUSY	BIT(2)
+#define RCAR_IIC_ICCR_SCP	BIT(0)
+
+/* ICSR / ICIC */
+#define RCAR_IC_BUSY		BIT(4)
+#define RCAR_IC_TACK		BIT(2)
+#define RCAR_IC_DTE		BIT(0)
+
+#define IRQ_WAIT 1000
+
+static void sh_irq_dte(struct udevice *dev)
+{
+	struct rcar_iic_priv *priv = dev_get_priv(dev);
+	int i;
+
+	for (i = 0; i < IRQ_WAIT; i++) {
+		if (RCAR_IC_DTE & readb(priv->base + RCAR_IIC_ICSR))
+			break;
+		udelay(10);
+	}
+}
+
+static int sh_irq_dte_with_tack(struct udevice *dev)
+{
+	struct rcar_iic_priv *priv = dev_get_priv(dev);
+	u8 icsr;
+	int i;
+
+	for (i = 0; i < IRQ_WAIT; i++) {
+		icsr = readb(priv->base + RCAR_IIC_ICSR);
+		if (RCAR_IC_DTE & icsr)
+			break;
+		if (RCAR_IC_TACK & icsr)
+			return -ETIMEDOUT;
+		udelay(10);
+	}
+	return 0;
+}
+
+static void sh_irq_busy(struct udevice *dev)
+{
+	struct rcar_iic_priv *priv = dev_get_priv(dev);
+	int i;
+
+	for (i = 0; i < IRQ_WAIT; i++) {
+		if (!(RCAR_IC_BUSY & readb(priv->base + RCAR_IIC_ICSR)))
+			break;
+		udelay(10);
+	}
+}
+
+static int rcar_iic_set_addr(struct udevice *dev, u8 chip, u8 read)
+{
+	struct rcar_iic_priv *priv = dev_get_priv(dev);
+
+	clrbits_8(priv->base + RCAR_IIC_ICCR, RCAR_IIC_ICCR_ICE);
+	setbits_8(priv->base + RCAR_IIC_ICCR, RCAR_IIC_ICCR_ICE);
+
+	writeb(priv->iccl, priv->base + RCAR_IIC_ICCL);
+	writeb(priv->icch, priv->base + RCAR_IIC_ICCH);
+	writeb(RCAR_IC_TACK, priv->base + RCAR_IIC_ICIC);
+
+	writeb(RCAR_IIC_ICCR_ICE | RCAR_IIC_ICCR_RTS | RCAR_IIC_ICCR_BUSY,
+	       priv->base + RCAR_IIC_ICCR);
+	sh_irq_dte(dev);
+
+	clrbits_8(priv->base + RCAR_IIC_ICSR, RCAR_IC_TACK);
+	writeb(chip << 1 | read, priv->base + RCAR_IIC_ICDR);
+	return sh_irq_dte_with_tack(dev);
+}
+
+static void rcar_iic_finish(struct udevice *dev)
+{
+	struct rcar_iic_priv *priv = dev_get_priv(dev);
+
+	writeb(0, priv->base + RCAR_IIC_ICSR);
+	clrbits_8(priv->base + RCAR_IIC_ICCR, RCAR_IIC_ICCR_ICE);
+}
+
+static int rcar_iic_read_common(struct udevice *dev, struct i2c_msg *msg)
+{
+	struct rcar_iic_priv *priv = dev_get_priv(dev);
+	int i, ret = -EREMOTEIO;
+
+	if (rcar_iic_set_addr(dev, msg->addr, 1) != 0)
+		goto err;
+
+	udelay(10);
+
+	writeb(RCAR_IIC_ICCR_ICE | RCAR_IIC_ICCR_SCP,
+	       priv->base + RCAR_IIC_ICCR);
+
+	for (i = 0; i < msg->len; i++) {
+		if (sh_irq_dte_with_tack(dev) != 0)
+			goto err;
+
+		msg->buf[i] = readb(priv->base + RCAR_IIC_ICDR) & 0xff;
+
+		if (msg->len - 1 == i) {
+			writeb(RCAR_IIC_ICCR_ICE | RCAR_IIC_ICCR_RACK,
+			       priv->base + RCAR_IIC_ICCR);
+		}
+	}
+
+	sh_irq_busy(dev);
+	ret = 0;
+
+err:
+	rcar_iic_finish(dev);
+	return ret;
+}
+
+static int rcar_iic_write_common(struct udevice *dev, struct i2c_msg *msg)
+{
+	struct rcar_iic_priv *priv = dev_get_priv(dev);
+	int i, ret = -EREMOTEIO;
+
+	if (rcar_iic_set_addr(dev, msg->addr, 0) != 0)
+		goto err;
+
+	udelay(10);
+
+	for (i = 0; i < msg->len; i++) {
+		writeb(msg->buf[i], priv->base + RCAR_IIC_ICDR);
+		if (sh_irq_dte_with_tack(dev) != 0)
+			goto err;
+	}
+
+	if (msg->flags & I2C_M_STOP) {
+		writeb(RCAR_IIC_ICCR_ICE | RCAR_IIC_ICCR_RTS,
+		       priv->base + RCAR_IIC_ICCR);
+		if (sh_irq_dte_with_tack(dev) != 0)
+			goto err;
+	}
+
+	sh_irq_busy(dev);
+	ret = 0;
+
+err:
+	rcar_iic_finish(dev);
+	return ret;
+}
+
+static int rcar_iic_xfer(struct udevice *dev, struct i2c_msg *msg, int nmsgs)
+{
+	int ret;
+
+	for (; nmsgs > 0; nmsgs--, msg++) {
+		if (msg->flags & I2C_M_RD)
+			ret = rcar_iic_read_common(dev, msg);
+		else
+			ret = rcar_iic_write_common(dev, msg);
+
+		if (ret)
+			return -EREMOTEIO;
+	}
+
+	return ret;
+}
+
+static int rcar_iic_set_speed(struct udevice *dev, uint speed)
+{
+	struct rcar_iic_priv *priv = dev_get_priv(dev);
+	const unsigned int ratio_high = 4;
+	const unsigned int ratio_low = 5;
+	int clkrate, denom;
+
+	clkrate = clk_get_rate(&priv->clk);
+	if (clkrate < 0)
+		return clkrate;
+
+	/*
+	 * Calculate the value for ICCL and ICCH. From the data sheet:
+	 * iccl = (p-clock / transfer-rate) * (L / (L + H))
+	 * icch = (p clock / transfer rate) * (H / (L + H))
+	 * where L and H are the SCL low and high ratio.
+	 */
+	denom = speed * (ratio_high + ratio_low);
+	priv->iccl = DIV_ROUND_CLOSEST(clkrate * ratio_low, denom);
+	priv->icch = DIV_ROUND_CLOSEST(clkrate * ratio_high, denom);
+
+	return 0;
+}
+
+static int rcar_iic_probe_chip(struct udevice *dev, uint addr, uint flags)
+{
+	struct rcar_iic_priv *priv = dev_get_priv(dev);
+	int ret;
+
+	rcar_iic_set_addr(dev, addr, 1);
+	writeb(RCAR_IIC_ICCR_ICE | RCAR_IIC_ICCR_SCP,
+	       priv->base + RCAR_IIC_ICCR);
+	ret = sh_irq_dte_with_tack(dev);
+	rcar_iic_finish(dev);
+
+	return ret;
+}
+
+static int rcar_iic_probe(struct udevice *dev)
+{
+	struct rcar_iic_priv *priv = dev_get_priv(dev);
+	int ret;
+
+	priv->base = dev_read_addr_ptr(dev);
+
+	ret = clk_get_by_index(dev, 0, &priv->clk);
+	if (ret)
+		return ret;
+
+	ret = clk_enable(&priv->clk);
+	if (ret)
+		return ret;
+
+	rcar_iic_finish(dev);
+
+	return rcar_iic_set_speed(dev, I2C_SPEED_STANDARD_RATE);
+}
+
+static const struct dm_i2c_ops rcar_iic_ops = {
+	.xfer		= rcar_iic_xfer,
+	.probe_chip	= rcar_iic_probe_chip,
+	.set_bus_speed	= rcar_iic_set_speed,
+};
+
+static const struct udevice_id rcar_iic_ids[] = {
+	{ .compatible = "renesas,rmobile-iic" },
+	{ }
+};
+
+U_BOOT_DRIVER(iic_rcar) = {
+	.name		= "iic_rcar",
+	.id		= UCLASS_I2C,
+	.of_match	= rcar_iic_ids,
+	.probe		= rcar_iic_probe,
+	.priv_auto	= sizeof(struct rcar_iic_priv),
+	.ops		= &rcar_iic_ops,
+};