[ARM] Kirkwood: Hook up I2C

Hook up I2C on Marvell Kirkwood.  Tested on a QNAP TS-219 which has
RTC connected through I2C.

Signed-off-by: Martin Michlmayr <tbm@cyrius.com>
Signed-off-by: Nicolas Pitre <nico@marvell.com>

3 files changed, 42 insertions, 0 deletions

diff --git a/arch/arm/mach-kirkwood/common.c b/arch/arm/mach-kirkwood/common.c
index 9f012551794d..19b03f62c3f4 100644
--- a/arch/arm/mach-kirkwood/common.c
+++ b/arch/arm/mach-kirkwood/common.c
@@ -14,6 +14,7 @@
 #include <linux/serial_8250.h>
 #include <linux/mbus.h>
 #include <linux/mv643xx_eth.h>
+#include <linux/mv643xx_i2c.h>
 #include <linux/ata_platform.h>
 #include <linux/spi/orion_spi.h>
 #include <net/dsa.h>
@@ -371,6 +372,45 @@ void __init kirkwood_spi_init()
 
 
 /*****************************************************************************
+ * I2C
+ ****************************************************************************/
+static struct mv64xxx_i2c_pdata kirkwood_i2c_pdata = {
+        .freq_m         = 8, /* assumes 166 MHz TCLK */
+        .freq_n         = 3,
+        .timeout        = 1000, /* Default timeout of 1 second */
+};
+
+static struct resource kirkwood_i2c_resources[] = {
+        {
+                .name   = "i2c",
+                .start  = I2C_PHYS_BASE,
+                .end    = I2C_PHYS_BASE + 0x1f,
+                .flags  = IORESOURCE_MEM,
+        }, {
+                .name   = "i2c",
+                .start  = IRQ_KIRKWOOD_TWSI,
+                .end    = IRQ_KIRKWOOD_TWSI,
+                .flags  = IORESOURCE_IRQ,
+        },
+};
+
+static struct platform_device kirkwood_i2c = {
+        .name           = MV64XXX_I2C_CTLR_NAME,
+        .id             = 0,
+        .num_resources  = ARRAY_SIZE(kirkwood_i2c_resources),
+        .resource       = kirkwood_i2c_resources,
+        .dev            = {
+                .platform_data  = &kirkwood_i2c_pdata,
+        },
+};
+
+void __init kirkwood_i2c_init(void)
+{
+        platform_device_register(&kirkwood_i2c);
+}
+
+
+/*****************************************************************************
  * UART0
  ****************************************************************************/
 static struct plat_serial8250_port kirkwood_uart0_data[] = {
diff --git a/arch/arm/mach-kirkwood/common.h b/arch/arm/mach-kirkwood/common.h
index 9e5282684d58..c66a25066cea 100644
--- a/arch/arm/mach-kirkwood/common.h
+++ b/arch/arm/mach-kirkwood/common.h
@@ -37,6 +37,7 @@ void kirkwood_pcie_init(void);
 void kirkwood_sata_init(struct mv_sata_platform_data *sata_data);
 void kirkwood_sdio_init(struct mvsdio_platform_data *mvsdio_data);
 void kirkwood_spi_init(void);
+void kirkwood_i2c_init(void);
 void kirkwood_uart0_init(void);
 void kirkwood_uart1_init(void);
 
diff --git a/arch/arm/mach-kirkwood/include/mach/kirkwood.h b/arch/arm/mach-kirkwood/include/mach/kirkwood.h
index d3db30fe763b..38c986853590 100644
--- a/arch/arm/mach-kirkwood/include/mach/kirkwood.h
+++ b/arch/arm/mach-kirkwood/include/mach/kirkwood.h
@@ -93,6 +93,7 @@
 #define  DEVICE_ID              (DEV_BUS_VIRT_BASE | 0x0034)
 #define  RTC_PHYS_BASE          (DEV_BUS_PHYS_BASE | 0x0300)
 #define  SPI_PHYS_BASE          (DEV_BUS_PHYS_BASE | 0x0600)
+#define  I2C_PHYS_BASE          (DEV_BUS_PHYS_BASE | 0x1000)
 #define  UART0_PHYS_BASE        (DEV_BUS_PHYS_BASE | 0x2000)
 #define  UART0_VIRT_BASE        (DEV_BUS_VIRT_BASE | 0x2000)
 #define  UART1_PHYS_BASE        (DEV_BUS_PHYS_BASE | 0x2100)