davinci: Add NAND flash support for DA850/OMAP-L138

This patch adds platform data for the 512MB NAND Flash
found on DA850/OMAP-L138 EVM. Currently it supports
only 1-bit ECC.

Signed-off-by: Sudhakar Rajashekhara <sudhakar.raj@ti.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

1 files changed, 85 insertions, 0 deletions

diff --git a/arch/arm/mach-davinci/board-da850-evm.c b/arch/arm/mach-davinci/board-da850-evm.c
index eb998ce6d465..62d37cb6f29d 100644
--- a/arch/arm/mach-davinci/board-da850-evm.c
+++ b/arch/arm/mach-davinci/board-da850-evm.c
@@ -18,6 +18,10 @@
 #include <linux/i2c.h>
 #include <linux/i2c/at24.h>
 #include <linux/gpio.h>
+#include <linux/platform_device.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>
@@ -26,6 +30,7 @@
 #include <mach/irqs.h>
 #include <mach/cp_intc.h>
 #include <mach/da8xx.h>
+#include <mach/nand.h>
 
 #define DA850_EVM_PHY_MASK              0x1
 #define DA850_EVM_MDIO_FREQUENCY        2200000 /* PHY bus frequency */
@@ -36,6 +41,74 @@
 #define DA850_MMCSD_CD_PIN              GPIO_TO_PIN(4, 0)
 #define DA850_MMCSD_WP_PIN              GPIO_TO_PIN(4, 1)
 
+/* DA850/OMAP-L138 EVM includes a 512 MByte large-page NAND flash
+ * (128K blocks). It may be used instead of the (default) SPI flash
+ * to boot, using TI's tools to install the secondary boot loader
+ * (UBL) and U-Boot.
+ */
+struct mtd_partition da850_evm_nandflash_partition[] = {
+        {
+                .name           = "u-boot env",
+                .offset         = 0,
+                .size           = SZ_128K,
+                .mask_flags     = MTD_WRITEABLE,
+         },
+        {
+                .name           = "UBL",
+                .offset         = MTDPART_OFS_APPEND,
+                .size           = SZ_128K,
+                .mask_flags     = MTD_WRITEABLE,
+        },
+        {
+                .name           = "u-boot",
+                .offset         = MTDPART_OFS_APPEND,
+                .size           = 4 * SZ_128K,
+                .mask_flags     = MTD_WRITEABLE,
+        },
+        {
+                .name           = "kernel",
+                .offset         = 0x200000,
+                .size           = SZ_2M,
+                .mask_flags     = 0,
+        },
+        {
+                .name           = "filesystem",
+                .offset         = MTDPART_OFS_APPEND,
+                .size           = MTDPART_SIZ_FULL,
+                .mask_flags     = 0,
+        },
+};
+
+static struct davinci_nand_pdata da850_evm_nandflash_data = {
+        .parts          = da850_evm_nandflash_partition,
+        .nr_parts       = ARRAY_SIZE(da850_evm_nandflash_partition),
+        .ecc_mode       = NAND_ECC_HW,
+        .options        = NAND_USE_FLASH_BBT,
+};
+
+static struct resource da850_evm_nandflash_resource[] = {
+        {
+                .start  = DA8XX_AEMIF_CS3_BASE,
+                .end    = DA8XX_AEMIF_CS3_BASE + SZ_512K + 2 * SZ_1K - 1,
+                .flags  = IORESOURCE_MEM,
+        },
+        {
+                .start  = DA8XX_AEMIF_CTL_BASE,
+                .end    = DA8XX_AEMIF_CTL_BASE + SZ_32K - 1,
+                .flags  = IORESOURCE_MEM,
+        },
+};
+
+static struct platform_device da850_evm_nandflash_device = {
+        .name           = "davinci_nand",
+        .id             = 1,
+        .dev            = {
+                .platform_data  = &da850_evm_nandflash_data,
+        },
+        .num_resources  = ARRAY_SIZE(da850_evm_nandflash_resource),
+        .resource       = da850_evm_nandflash_resource,
+};
+
 static struct davinci_i2c_platform_data da850_evm_i2c_0_pdata = {
         .bus_freq       = 100,  /* kHz */
         .bus_delay      = 0,    /* usec */
@@ -45,6 +118,10 @@ static struct davinci_uart_config da850_evm_uart_config __initdata = {
         .enabled_uarts = 0x7,
 };
 
+static struct platform_device *da850_evm_devices[] __initdata = {
+        &da850_evm_nandflash_device,
+};
+
 /* davinci da850 evm audio machine driver */
 static u8 da850_iis_serializer_direction[] = {
         INACTIVE_MODE,  INACTIVE_MODE,  INACTIVE_MODE,  INACTIVE_MODE,
@@ -120,6 +197,14 @@ static __init void da850_evm_init(void)
         struct davinci_soc_info *soc_info = &davinci_soc_info;
         int ret;
 
+        ret = da8xx_pinmux_setup(da850_nand_pins);
+        if (ret)
+                pr_warning("da850_evm_init: nand mux setup failed: %d\n",
+                                ret);
+
+        platform_add_devices(da850_evm_devices,
+                                ARRAY_SIZE(da850_evm_devices));
+
         ret = da8xx_register_edma();
         if (ret)
                 pr_warning("da850_evm_init: edma registration failed: %d\n",