Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <[email protected]>
---
drivers/i2c/busses/Kconfig | 8 +++
drivers/i2c/busses/Makefile | 1 +
drivers/i2c/busses/i2c-versatile.c | 112 ++++++++++++++++++++++++++++++++++++
3 files changed, 121 insertions(+)
create mode 100644 drivers/i2c/busses/i2c-versatile.c
diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 17e33cb..68d9b46 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -20,4 +20,12 @@ config I2C_OMAP
bool "OMAP I2C Master driver"
depends on ARCH_OMAP
+config I2C_VERSATILE
+ tristate "ARM Versatile/Realview I2C bus support"
+ depends on ARCH_VERSATILE
+ select I2C_ALGOBIT
+ help
+ Say yes if you want to support the I2C serial bus on ARMs Versatile
+ range of platforms.
+
endmenu
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index 18c7c46..a30f9b8 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -1,3 +1,4 @@
obj-$(CONFIG_I2C_GPIO) += i2c-gpio.o
obj-$(CONFIG_I2C_IMX) += i2c-imx.o
obj-$(CONFIG_I2C_OMAP) += i2c-omap.o
+obj-$(CONFIG_I2C_VERSATILE) += i2c-versatile.o
diff --git a/drivers/i2c/busses/i2c-versatile.c
b/drivers/i2c/busses/i2c-versatile.c
new file mode 100644
index 0000000..7c99322
--- /dev/null
+++ b/drivers/i2c/busses/i2c-versatile.c
@@ -0,0 +1,112 @@
+/*
+ * i2c-versatile.c
+ *
+ * Copyright (C) 2006 ARM Ltd.
+ * written by Russell King, Deep Blue Solutions Ltd.
+ *
+ * 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 <common.h>
+#include <driver.h>
+#include <i2c/i2c.h>
+#include <i2c/i2c-algo-bit.h>
+#include <init.h>
+#include <malloc.h>
+#include <io.h>
+
+#define I2C_CONTROL 0x00
+#define I2C_CONTROLS 0x00
+#define I2C_CONTROLC 0x04
+#define SCL (1 << 0)
+#define SDA (1 << 1)
+
+struct i2c_versatile {
+ struct i2c_adapter adap;
+ struct i2c_algo_bit_data algo;
+ void __iomem *base;
+};
+
+static void i2c_versatile_setsda(void *data, int state)
+{
+ struct i2c_versatile *i2c = data;
+
+ writel(SDA, i2c->base + (state ? I2C_CONTROLS : I2C_CONTROLC));
+}
+
+static void i2c_versatile_setscl(void *data, int state)
+{
+ struct i2c_versatile *i2c = data;
+
+ writel(SCL, i2c->base + (state ? I2C_CONTROLS : I2C_CONTROLC));
+}
+
+static int i2c_versatile_getsda(void *data)
+{
+ struct i2c_versatile *i2c = data;
+ return !!(readl(i2c->base + I2C_CONTROL) & SDA);
+}
+
+static int i2c_versatile_getscl(void *data)
+{
+ struct i2c_versatile *i2c = data;
+ return !!(readl(i2c->base + I2C_CONTROL) & SCL);
+}
+
+static struct i2c_algo_bit_data i2c_versatile_algo = {
+ .setsda = i2c_versatile_setsda,
+ .setscl = i2c_versatile_setscl,
+ .getsda = i2c_versatile_getsda,
+ .getscl = i2c_versatile_getscl,
+ .udelay = 30,
+ .timeout_ms = 100,
+};
+
+static int i2c_versatile_probe(struct device_d *dev)
+{
+ struct i2c_versatile *i2c;
+ int ret;
+
+ i2c = kzalloc(sizeof(struct i2c_versatile), GFP_KERNEL);
+ if (!i2c) {
+ ret = -ENOMEM;
+ goto err_release;
+ }
+
+ i2c->base = dev_request_mem_region(dev, 0);
+ if (!i2c->base) {
+ ret = -ENOMEM;
+ goto err_free;
+ }
+
+ writel(SCL | SDA, i2c->base + I2C_CONTROLS);
+
+ i2c->adap.algo_data = &i2c->algo;
+ i2c->adap.dev.parent = dev;
+ i2c->algo = i2c_versatile_algo;
+ i2c->algo.data = i2c;
+
+ i2c->adap.nr = dev->id;
+ ret = i2c_bit_add_numbered_bus(&i2c->adap);
+ if (ret >= 0) {
+ return 0;
+ }
+
+ err_free:
+ kfree(i2c);
+ err_release:
+ return ret;
+}
+
+static struct driver_d i2c_versatile_driver = {
+ .name = "versatile-i2c",
+ .probe = i2c_versatile_probe,
+};
+
+static int __init i2c_versatile_init(void)
+{
+ return platform_driver_register(&i2c_versatile_driver);
+}
+
+device_initcall(i2c_versatile_init);
--
1.7.10.4
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