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-rw-r--r--drivers/i2c/Kconfig6
-rw-r--r--drivers/i2c/Makefile1
-rw-r--r--drivers/i2c/rcar_iic.c271
3 files changed, 278 insertions, 0 deletions
diff --git a/drivers/i2c/Kconfig b/drivers/i2c/Kconfig
index 1989f8eb57..cc370b9c57 100644
--- a/drivers/i2c/Kconfig
+++ b/drivers/i2c/Kconfig
@@ -157,6 +157,12 @@ config SYS_I2C_OMAP24XX
help
Add support for the OMAP2+ I2C driver.
+config SYS_I2C_RCAR_IIC
+ bool "Renesas RCar Gen3 IIC driver"
+ depends on RCAR_GEN3 && DM_I2C
+ help
+ Support for Renesas RCar Gen3 IIC controller.
+
config SYS_I2C_ROCKCHIP
bool "Rockchip I2C driver"
depends on DM_I2C
diff --git a/drivers/i2c/Makefile b/drivers/i2c/Makefile
index 733cd3e92f..169a2f1d7a 100644
--- a/drivers/i2c/Makefile
+++ b/drivers/i2c/Makefile
@@ -31,6 +31,7 @@ obj-$(CONFIG_SYS_I2C_MXC) += mxc_i2c.o
obj-$(CONFIG_SYS_I2C_MXS) += mxs_i2c.o
obj-$(CONFIG_SYS_I2C_OMAP24XX) += omap24xx_i2c.o
obj-$(CONFIG_SYS_I2C_RCAR) += rcar_i2c.o
+obj-$(CONFIG_SYS_I2C_RCAR_IIC) += rcar_iic.o
obj-$(CONFIG_SYS_I2C_ROCKCHIP) += rk_i2c.o
obj-$(CONFIG_SYS_I2C_S3C24X0) += s3c24x0_i2c.o exynos_hs_i2c.o
obj-$(CONFIG_SYS_I2C_SANDBOX) += sandbox_i2c.o i2c-emul-uclass.o
diff --git a/drivers/i2c/rcar_iic.c b/drivers/i2c/rcar_iic.c
new file mode 100644
index 0000000000..57ae2f51fc
--- /dev/null
+++ b/drivers/i2c/rcar_iic.c
@@ -0,0 +1,271 @@
+/*
+ * 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>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <clk.h>
+#include <dm.h>
+#include <i2c.h>
+#include <asm/io.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);
+ int i;
+
+ for (i = 0; i < IRQ_WAIT; i++) {
+ if (RCAR_IC_DTE & readb(priv->base + RCAR_IIC_ICSR))
+ break;
+ if (RCAR_IC_TACK & readb(priv->base + RCAR_IIC_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, 100000);
+}
+
+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_alloc_size = sizeof(struct rcar_iic_priv),
+ .ops = &rcar_iic_ops,
+};
generated by cgit (git 2.34.1) at 2024-10-03 10:18:17 +0000