davinci: dm646x-evm: Add platform data for NAND

This patch adds platform data and partition info for NAND on dm6467 EVM.

Note that the partition layout is dependent on the UBL, U-Boot etc. used. This
patch tries to minimize that dependency by setting first partition for UBL,
U-Boot and environment altogether.

Signed-off-by: Hemant Pedanekar <hemantp@ti.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

1 files changed, 69 insertions, 0 deletions

diff --git a/arch/arm/mach-davinci/board-dm646x-evm.c b/arch/arm/mach-davinci/board-dm646x-evm.c
index 8cf49790f3a7..75b2b6fb8594 100644
--- a/arch/arm/mach-davinci/board-dm646x-evm.c
+++ b/arch/arm/mach-davinci/board-dm646x-evm.c
@@ -27,6 +27,10 @@
 
 #include <media/tvp514x.h>
 
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/nand.h>
+#include <linux/mtd/partitions.h>
+
 #include <asm/mach-types.h>
 #include <asm/mach/arch.h>
 
@@ -34,6 +38,7 @@
 #include <mach/common.h>
 #include <mach/serial.h>
 #include <mach/i2c.h>
+#include <mach/nand.h>
 
 #if defined(CONFIG_BLK_DEV_PALMCHIP_BK3710) || \
     defined(CONFIG_BLK_DEV_PALMCHIP_BK3710_MODULE)
@@ -42,6 +47,11 @@
 #define HAS_ATA 0
 #endif
 
+#define DAVINCI_ASYNC_EMIF_CONTROL_BASE         0x20008000
+#define DAVINCI_ASYNC_EMIF_DATA_CE0_BASE        0x42000000
+
+#define NAND_BLOCK_SIZE         SZ_128K
+
 /* CPLD Register 0 bits to control ATA */
 #define DM646X_EVM_ATA_RST              BIT(0)
 #define DM646X_EVM_ATA_PWD              BIT(1)
@@ -77,6 +87,63 @@ static struct davinci_uart_config uart_config __initdata = {
         .enabled_uarts = (1 << 0),
 };
 
+/* Note: We are setting first partition as 'bootloader' constituting UBL, U-Boot
+ * and U-Boot environment this avoids dependency on any particular combination
+ * of UBL, U-Boot or flashing tools etc.
+ */
+static struct mtd_partition davinci_nand_partitions[] = {
+        {
+                /* UBL, U-Boot with environment */
+                .name           = "bootloader",
+                .offset         = MTDPART_OFS_APPEND,
+                .size           = 16 * NAND_BLOCK_SIZE,
+                .mask_flags     = MTD_WRITEABLE,        /* force read-only */
+        }, {
+                .name           = "kernel",
+                .offset         = MTDPART_OFS_APPEND,
+                .size           = SZ_4M,
+                .mask_flags     = 0,
+        }, {
+                .name           = "filesystem",
+                .offset         = MTDPART_OFS_APPEND,
+                .size           = MTDPART_SIZ_FULL,
+                .mask_flags     = 0,
+        }
+};
+
+static struct davinci_nand_pdata davinci_nand_data = {
+        .mask_cle               = 0x80000,
+        .mask_ale               = 0x40000,
+        .parts                  = davinci_nand_partitions,
+        .nr_parts               = ARRAY_SIZE(davinci_nand_partitions),
+        .ecc_mode               = NAND_ECC_HW,
+        .options                = 0,
+};
+
+static struct resource davinci_nand_resources[] = {
+        {
+                .start          = DAVINCI_ASYNC_EMIF_DATA_CE0_BASE,
+                .end            = DAVINCI_ASYNC_EMIF_DATA_CE0_BASE + SZ_32M - 1,
+                .flags          = IORESOURCE_MEM,
+        }, {
+                .start          = DAVINCI_ASYNC_EMIF_CONTROL_BASE,
+                .end            = DAVINCI_ASYNC_EMIF_CONTROL_BASE + SZ_4K - 1,
+                .flags          = IORESOURCE_MEM,
+        },
+};
+
+static struct platform_device davinci_nand_device = {
+        .name                   = "davinci_nand",
+        .id                     = 0,
+
+        .num_resources          = ARRAY_SIZE(davinci_nand_resources),
+        .resource               = davinci_nand_resources,
+
+        .dev                    = {
+                .platform_data  = &davinci_nand_data,
+        },
+};
+
 /* CPLD Register 0 Client: used for I/O Control */
 static int cpld_reg0_probe(struct i2c_client *client,
                            const struct i2c_device_id *id)
@@ -632,6 +699,8 @@ static __init void evm_init(void)
         dm646x_init_mcasp0(&dm646x_evm_snd_data[0]);
         dm646x_init_mcasp1(&dm646x_evm_snd_data[1]);
 
+        platform_device_register(&davinci_nand_device);
+
         if (HAS_ATA)
                 dm646x_init_ide();