DA830 EVM: Enable NAND support on Spectrum Digital EVM

The EVM UI extender card has a NAND device. This change will enable
saveenv to work with NAND and Linux to be booted using:

	mtdparts default
	nboot kernel
	bootm

Signed-off-by: Nick Thompson <nick.thompson@ge.com>
Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>

board/davinci/da830evm/da830evm.c

@@ -35,6 +35,7 @@
 #include <common.h>
 #include <i2c.h>
 #include <asm/arch/hardware.h>
+#include <asm/arch/emif_defs.h>
 #include <asm/io.h>
 #include "../common/misc.h"
 
@@ -51,6 +52,23 @@ static const struct pinmux_config spi0_pins[] = {
 	{ pinmux[7], 1, 7 }
 };
 
+/* EMIF-A bus pins for 8-bit NAND support on CS3 */
+static const struct pinmux_config emifa_nand_pins[] = {
+	{ pinmux[13], 1, 6 },
+	{ pinmux[13], 1, 7 },
+	{ pinmux[14], 1, 0 },
+	{ pinmux[14], 1, 1 },
+	{ pinmux[14], 1, 2 },
+	{ pinmux[14], 1, 3 },
+	{ pinmux[14], 1, 4 },
+	{ pinmux[14], 1, 5 },
+	{ pinmux[15], 1, 7 },
+	{ pinmux[16], 1, 0 },
+	{ pinmux[18], 1, 1 },
+	{ pinmux[18], 1, 4 },
+	{ pinmux[18], 1, 5 },
+};
+
 /* UART pin muxer settings */
 static const struct pinmux_config uart_pins[] = {
 	{ pinmux[8], 2, 7 },
@@ -77,6 +95,9 @@ static const struct pinmux_resource pinmuxes[] = {
 #ifdef CONFIG_USB_DA8XX
 	PINMUX_ITEM(usb_pins),
 #endif
+#ifdef CONFIG_USE_NAND
+	PINMUX_ITEM(emifa_nand_pins),
+#endif
 };
 
 int board_init(void)
@@ -96,6 +117,22 @@ int board_init(void)
 	writel(0xffffffff, &davinci_aintc_regs->ecr3);
 #endif
 
+#ifdef CONFIG_NAND_DAVINCI
+	/* EMIFA 100MHz clock select */
+	writel(readl(&davinci_syscfg_regs->cfgchip3) & ~2,
+	       &davinci_syscfg_regs->cfgchip3);
+	/* NAND CS setup */
+	writel((DAVINCI_ABCR_WSETUP(0) |
+		DAVINCI_ABCR_WSTROBE(2) |
+		DAVINCI_ABCR_WHOLD(0) |
+		DAVINCI_ABCR_RSETUP(0) |
+		DAVINCI_ABCR_RSTROBE(2) |
+		DAVINCI_ABCR_RHOLD(0) |
+		DAVINCI_ABCR_TA(2) |
+		DAVINCI_ABCR_ASIZE_8BIT),
+	       &davinci_emif_regs->AB2CR);
+#endif
+
 	/* arch number of the board */
 	gd->bd->bi_arch_number = MACH_TYPE_DAVINCI_DA830_EVM;
 

include/configs/da830evm.h

@@ -103,14 +103,15 @@
 #define CONFIG_NAND_DAVINCI
 #define CONFIG_SYS_NO_FLASH
 #define CONFIG_ENV_IS_IN_NAND		/* U-Boot env in NAND Flash  */
-#define CONFIG_ENV_OFFSET		0x0 /* Block 0--not used by bootcode */
-#define CONFIG_ENV_SIZE			(128 << 10)
+#define CONFIG_ENV_OFFSET		(512 << 10)
+#define CONFIG_ENV_SIZE			(512 << 10)
 #define CONFIG_SYS_NAND_4BIT_HW_ECC_OOBFIRST
 #define CONFIG_SYS_NAND_CS		3
 #define CONFIG_SYS_NAND_BASE		DAVINCI_ASYNC_EMIF_DATA_CE3_BASE
+#define CONFIG_SYS_NAND_PAGE_2K
+#define CONFIG_SYS_64BIT_VSPRINTF	/* needed for nand_util.c */
 #define CONFIG_SYS_CLE_MASK		0x10
 #define CONFIG_SYS_ALE_MASK		0x8
-#define CONFIG_SYS_NAND_HW_ECC
 #define CONFIG_SYS_MAX_NAND_DEVICE	1 /* Max number of NAND devices */
 #define NAND_MAX_CHIPS			1
 #define DEF_BOOTM			""
@@ -216,8 +217,7 @@
 #define CONFIG_CMD_NAND
 #define CONFIG_CMD_MTDPARTS
 #define CONFIG_MTD_PARTITIONS
-#define CONFIG_CMD_UBI
-#define CONFIG_RBTREE
+#define CONFIG_MTD_DEVICE
 #endif
 
 #ifdef CONFIG_USE_SPIFLASH
@@ -268,4 +268,15 @@
 #endif /* CONFIG_MUSB_UDC */
 
 #endif /* CONFIG_USB_DA8XX */
+
+#ifdef CONFIG_MTD_PARTITIONS
+#define MTDIDS_DEFAULT		"nand0=davinci_nand.1"
+#define PART_BOOT		"512k(bootloader)ro,"
+#define PART_PARAMS		"512k(params)ro,"
+#define PART_KERNEL		"4m(kernel),"
+#define PART_REST		"-(filesystem)"
+#define MTDPARTS_DEFAULT        \
+	"mtdparts=davinci_nand.1:" PART_BOOT PART_PARAMS PART_KERNEL PART_REST
+#endif
+
 #endif /* __CONFIG_H */