[U-Boot] [PATCH V5 4/6] I2C: add i2c support for Pantheon platform

[Lei Wen]

Add i2c support to dkb board with pantheon soc.

Signed-off-by: Lei Wen <leiwen at marvell.com>
---
Changelog:
V2:
NO CHANGE

V3:
clean code sytle issue
Add i2c clock enable code include in I2C configure define block

V4:
make i2c definition included in the ifdef

V5:
NO CHANGE

 arch/arm/cpu/arm926ejs/pantheon/cpu.c    |   12 ++++++++++++
 arch/arm/include/asm/arch-pantheon/cpu.h |    4 +++-
 arch/arm/include/asm/arch-pantheon/mfp.h |    6 ++++--
 board/Marvell/dkb/dkb.c                  |    4 ++++
 include/configs/dkb.h                    |   13 +++++++++++++
 5 files changed, 36 insertions(+), 3 deletions(-)

diff --git a/arch/arm/cpu/arm926ejs/pantheon/cpu.c b/arch/arm/cpu/arm926ejs/pantheon/cpu.c
index 9ddc77c..8b2eafa 100644
--- a/arch/arm/cpu/arm926ejs/pantheon/cpu.c
+++ b/arch/arm/cpu/arm926ejs/pantheon/cpu.c
@@ -59,6 +59,12 @@ int arch_cpu_init(void)
 	/* Enable GPIO clock */
 	writel(APBC_APBCLK, &apbclkres->gpio);
 
+#ifdef CONFIG_I2C_MV
+	/* Enable I2C clock */
+	writel(APBC_RST | APBC_FNCLK | APBC_APBCLK, &apbclkres->twsi);
+	writel(APBC_FNCLK | APBC_APBCLK, &apbclkres->twsi);
+#endif
+
 	icache_enable();
 
 	return 0;
@@ -76,3 +82,9 @@ int print_cpuinfo(void)
 	return 0;
 }
 #endif
+
+#ifdef CONFIG_I2C_MV
+void i2c_clk_enable(void)
+{
+}
+#endif
diff --git a/arch/arm/include/asm/arch-pantheon/cpu.h b/arch/arm/include/asm/arch-pantheon/cpu.h
index 30f4393..60955c5 100644
--- a/arch/arm/include/asm/arch-pantheon/cpu.h
+++ b/arch/arm/include/asm/arch-pantheon/cpu.h
@@ -50,7 +50,9 @@ struct panthapb_registers {
 	u32 uart0;	/*0x000*/
 	u32 uart1;	/*0x004*/
 	u32 gpio;	/*0x008*/
-	u8 pad0[0x034 - 0x08 - 4];
+	u8 pad0[0x02c - 0x08 - 4];
+	u32 twsi;	/*0x02c*/
+	u8 pad1[0x034 - 0x2c - 4];
 	u32 timers;	/*0x034*/
 };
 
diff --git a/arch/arm/include/asm/arch-pantheon/mfp.h b/arch/arm/include/asm/arch-pantheon/mfp.h
index fb291cf..e939196 100644
--- a/arch/arm/include/asm/arch-pantheon/mfp.h
+++ b/arch/arm/include/asm/arch-pantheon/mfp.h
@@ -32,8 +32,10 @@
  * offset, pull,pF, drv,dF, edge,eF ,afn,aF
  */
 /* UART2 */
-#define MFP47_UART2_RXD		MFP_REG(0x198) | MFP_AF6 | MFP_DRIVE_MEDIUM
-#define MFP48_UART2_TXD		MFP_REG(0x19c) | MFP_AF6 | MFP_DRIVE_MEDIUM
+#define MFP47_UART2_RXD		(MFP_REG(0x198) | MFP_AF6 | MFP_DRIVE_MEDIUM)
+#define MFP48_UART2_TXD		(MFP_REG(0x19c) | MFP_AF6 | MFP_DRIVE_MEDIUM)
+#define MFP53_CI2C_SCL		(MFP_REG(0x1b0) | MFP_AF2 | MFP_DRIVE_MEDIUM)
+#define MFP54_CI2C_SDA		(MFP_REG(0x1b4) | MFP_AF2 | MFP_DRIVE_MEDIUM)
 
 /* More macros can be defined here... */
 
diff --git a/board/Marvell/dkb/dkb.c b/board/Marvell/dkb/dkb.c
index 72a2d2a..00f73e7 100644
--- a/board/Marvell/dkb/dkb.c
+++ b/board/Marvell/dkb/dkb.c
@@ -36,6 +36,10 @@ int board_early_init_f(void)
 		MFP47_UART2_RXD,
 		MFP48_UART2_TXD,
 
+		/* I2C */
+		MFP53_CI2C_SCL,
+		MFP54_CI2C_SDA,
+
 		MFP_EOC		/*End of configureation*/
 	};
 	/* configure MFP's */
diff --git a/include/configs/dkb.h b/include/configs/dkb.h
index 638af5e..599c8b8 100644
--- a/include/configs/dkb.h
+++ b/include/configs/dkb.h
@@ -56,6 +56,19 @@
 #include "mv-common.h"
 
 #undef CONFIG_ARCH_MISC_INIT
+
+/*
+ * I2C definition
+ */
+#define CONFIG_CMD_I2C
+#ifdef CONFIG_CMD_I2C
+#define CONFIG_I2C_MV			1
+#define CONFIG_PXA_I2C_REG		0xd4011000
+#define CONFIG_HARD_I2C			1
+#define CONFIG_SYS_I2C_SPEED		0
+#define CONFIG_SYS_I2C_SLAVE		0xfe
+#endif
+
 /*
  * Environment variables configurations
  */
-- 
1.7.0.4