I2C: add i2c support for Pantheon platform

Add i2c support to dkb board with pantheon soc.

Acked-by: Heiko Schocher <hs@denx.de>
Acked-by: Prafulla Wadaskar <prafulla@marvell.com>
Signed-off-by: Lei Wen <leiwen@marvell.com>

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

arch/arm/include/asm/arch-pantheon/config.h

@@ -34,5 +34,15 @@
 #define MV_UART_CONSOLE_BASE	PANTHEON_UART1_BASE
 #define CONFIG_SYS_NS16550_IER	(1 << 6)	/* Bit 6 in UART_IER register
 						represents UART Unit Enable */
+/*
+ * I2C definition
+ */
+#ifdef CONFIG_CMD_I2C
+#define CONFIG_I2C_MV			1
+#define CONFIG_MV_I2C_REG		0xd4011000
+#define CONFIG_HARD_I2C			1
+#define CONFIG_SYS_I2C_SPEED		0
+#define CONFIG_SYS_I2C_SLAVE		0xfe
+#endif
 
 #endif /* _PANTHEON_CONFIG_H */

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*/
 };
 

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... */
 

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 */

include/configs/dkb.h

@@ -47,6 +47,7 @@
 #define CONFIG_SYS_NO_FLASH		/* Declare no flash (NOR/SPI) */
 #include <config_cmd_default.h>
 #define CONFIG_CMD_AUTOSCRIPT
+#define CONFIG_CMD_I2C
 #undef CONFIG_CMD_NET
 #undef CONFIG_CMD_NFS
 /*
@@ -56,6 +57,7 @@
 #include "mv-common.h"
 
 #undef CONFIG_ARCH_MISC_INIT
+
 /*
  * Environment variables configurations
  */