From 5fce773581801421d287115cc1638dfacb1fb256 Mon Sep 17 00:00:00 2001
From: Arun KS <arunks@mistralsolutions.com>
Date: Sat, 23 Aug 2008 14:48:10 +0530
Subject: [PATCH] OMAP2EVM : Add nand support

This patch adds nand support to omap2evm board

Signed-off-by: Arun KS <arunks@mistralsolutions.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
---
 arch/arm/mach-omap2/board-omap2evm.c | 107 +++++++++++++++++++++++++++
 1 file changed, 107 insertions(+)

diff --git a/arch/arm/mach-omap2/board-omap2evm.c b/arch/arm/mach-omap2/board-omap2evm.c
index 41882222376..138e80c33fc 100644
--- a/arch/arm/mach-omap2/board-omap2evm.c
+++ b/arch/arm/mach-omap2/board-omap2evm.c
@@ -19,17 +19,123 @@
 #include <linux/io.h>
 #include <linux/input.h>
 #include <linux/i2c/twl4030.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/partitions.h>
+#include <linux/mtd/nand.h>
 
 #include <mach/hardware.h>
 #include <asm/mach-types.h>
 #include <asm/mach/arch.h>
 #include <asm/mach/map.h>
+#include <asm/mach/flash.h>
 
 #include <mach/gpio.h>
 #include <mach/board.h>
 #include <mach/common.h>
 #include <mach/hsmmc.h>
 #include <mach/keypad.h>
+#include <mach/gpmc.h>
+#include <mach/nand.h>
+
+#define GPMC_OFF_CONFIG1_0 0x60
+
+static struct mtd_partition omap2evm_nand_partitions[] = {
+	{
+		.name		= "X-Loader",
+		.offset		= 0,
+		.size		= 1 * (64 * 2048),
+		.mask_flags	= MTD_WRITEABLE,	/* force read-only */
+	},
+	{
+		.name		= "U-Boot",
+		.offset		= MTDPART_OFS_APPEND,
+		.size		= 3 * (64 * 2048),
+		.mask_flags	= MTD_WRITEABLE,	/* force read-only */
+	},
+	{
+		.name		= "U-Boot Environment",
+		.offset		= MTDPART_OFS_APPEND,
+		.size		= 1 * (64 * 2048),
+	 },
+	{
+		.name		= "Kernel",
+		.offset		= MTDPART_OFS_APPEND,
+		.size		= 16 * (64 * 2048),	/* 2MB */
+	},
+	{
+		.name		= "Ramdisk",
+		.offset		= MTDPART_OFS_APPEND,
+		.size		= 32 * (64 * 2048),	/* 4MB */
+	},
+	{
+		.name		= "Filesystem",
+		.offset		= MTDPART_OFS_APPEND,
+		.size		= MTDPART_SIZ_FULL,
+	}
+};
+
+static struct omap_nand_platform_data omap2evm_nand_data = {
+	.parts		= omap2evm_nand_partitions,
+	.nr_parts	= ARRAY_SIZE(omap2evm_nand_partitions),
+	.dma_channel	= -1,	/* disable DMA in OMAP NAND driver */
+};
+
+static struct resource omap2evm_nand_resource = {
+	.flags		= IORESOURCE_MEM,
+};
+
+static struct platform_device omap2evm_nand_device = {
+	.name		= "omap2-nand",
+	.id		= -1,
+	.dev		= {
+		.platform_data	= &omap2evm_nand_data,
+	},
+	.num_resources	= 1,
+	.resource	= &omap2evm_nand_resource,
+};
+
+void __init omap2evm_flash_init(void)
+{
+	void __iomem *gpmc_base_add, *gpmc_cs_base_add;
+	unsigned char cs = 0;
+
+	gpmc_base_add = (__force void __iomem *)OMAP243X_GPMC_VIRT;
+	while (cs < GPMC_CS_NUM) {
+		int ret = 0;
+
+		/* Each GPMC set for a single CS is at offset 0x30 */
+		gpmc_cs_base_add = (gpmc_base_add + GPMC_OFF_CONFIG1_0 +
+				    (cs * 0x30));
+
+		/* xloader/Uboot would have programmed the NAND
+		 * base address for us This is a ugly hack. The proper
+		 * way of doing this is to pass the setup of u-boot up
+		 * to kernel using kernel params - something on the
+		 * lines of machineID. Check if Nand is
+		 * configured */
+		ret = __raw_readl(gpmc_cs_base_add + GPMC_CS_CONFIG1);
+		if ((ret & 0xC00) == (0x800)) {
+			/* Found it!! */
+			printk(KERN_INFO "NAND: Found NAND on CS %d \n", cs);
+			break;
+		}
+		cs++;
+	}
+	if (cs >= GPMC_CS_NUM) {
+		printk(KERN_INFO "MTD: Unable to find MTD configuration in "
+				 "GPMC   - not registering.\n");
+		return;
+	}
+
+	omap2evm_nand_data.cs			= cs;
+	omap2evm_nand_data.gpmc_cs_baseaddr	= gpmc_cs_base_add;
+	omap2evm_nand_data.gpmc_baseaddr	= gpmc_base_add;
+
+	if (platform_device_register(&omap2evm_nand_device) < 0) {
+		printk(KERN_ERR "Unable to register NAND device\n");
+		return;
+	}
+}
 
 static struct resource omap2evm_smc911x_resources[] = {
 	[0] =   {
@@ -160,6 +266,7 @@ static void __init omap2_evm_init(void)
 	omap_board_config_size = ARRAY_SIZE(omap2_evm_config);
 	omap_serial_init();
 	hsmmc_init();
+	omap2evm_flash_init();
 }
 
 static void __init omap2_evm_map_io(void)
-- 
2.41.0