arm nomadik: add i2c

Signed-off-by: Alessandro Rubini <rubini@unipv.it>
Acked-by: Andrea Gallo <andrea.gallo@stericsson.com>
Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

board/st/nhk8815/nhk8815.c

@@ -27,6 +27,7 @@
 
 #include <common.h>
 #include <asm/io.h>
+#include <asm/arch/gpio.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -61,9 +62,20 @@ int board_init(void)
 	return 0;
 }
 
-int misc_init_r(void)
+int board_late_init(void)
 {
-	setenv("verify", "n");
+	/* Set the two I2C gpio lines to be gpio high */
+	nmk_gpio_set(__SCL, 1);	nmk_gpio_set(__SDA, 1);
+	nmk_gpio_dir(__SCL, 1);	nmk_gpio_dir(__SDA, 1);
+	nmk_gpio_af(__SCL, GPIO_GPIO); nmk_gpio_af(__SDA, GPIO_GPIO);
+
+	/* Reset the I2C port expander, on GPIO77 */
+	nmk_gpio_af(77, GPIO_GPIO);
+	nmk_gpio_dir(77, 1);
+	nmk_gpio_set(77, 0);
+	udelay(10);
+	nmk_gpio_set(77, 1);
+
 	return 0;
 }
 

include/configs/nhk8815.h

@@ -93,7 +93,7 @@
 #define CONFIG_SYS_GBL_DATA_SIZE	128	/* for initial data */
 #define CONFIG_SYS_64BIT_VSPRINTF	/* mtd desires this */
 
-#define CONFIG_MISC_INIT_R	/* call misc_init_r during start up */
+#define BOARD_LATE_INIT		/* call board_late_init during start up */
 
 /* timing informazion */
 #define CONFIG_SYS_HZ		1000 /* Mandatory... */
@@ -110,6 +110,22 @@
 #define CONFIG_PL01x_PORTS	{ (void *)CFG_SERIAL0, (void *)CFG_SERIAL1 }
 #define CONFIG_PL011_CLOCK	48000000
 
+/* i2c, for the port extenders (uses gpio.c in board directory) */
+#ifndef __ASSEMBLY__
+#include <asm/arch/gpio.h>
+#define CONFIG_CMD_I2C
+#define CONFIG_SOFT_I2C
+#define CONFIG_SYS_I2C_SPEED	400000
+#define __SDA			63
+#define __SCL			62
+#define I2C_SDA(x)		nmk_gpio_set(__SDA, x)
+#define I2C_SCL(x)		nmk_gpio_set(__SCL, x)
+#define I2C_READ		(nmk_gpio_get(__SDA)!=0)
+#define I2C_ACTIVE		nmk_gpio_dir(__SDA, 1)
+#define I2C_TRISTATE		nmk_gpio_dir(__SDA, 0)
+#define I2C_DELAY     (udelay(2))
+#endif /* __ASSEMBLY__ */
+
 /* Ethernet */
 #define PCI_MEMORY_VADDR	0xe8000000
 #define PCI_IO_VADDR		0xee000000