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>

4 files changed, 135 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",
diff --git a/arch/arm/mach-davinci/da850.c b/arch/arm/mach-davinci/da850.c
index 9debd57deb71..db4209413450 100644
--- a/arch/arm/mach-davinci/da850.c
+++ b/arch/arm/mach-davinci/da850.c
@@ -310,6 +310,13 @@ static struct clk mmcsd_clk = {
         .lpsc           = DA8XX_LPSC0_MMC_SD,
 };
 
+static struct clk aemif_clk = {
+        .name           = "aemif",
+        .parent         = &pll0_sysclk3,
+        .lpsc           = DA8XX_LPSC0_EMIF25,
+        .flags          = ALWAYS_ENABLED,
+};
+
 static struct davinci_clk da850_clks[] = {
         CLK(NULL,               "ref",          &ref_clk),
         CLK(NULL,               "pll0",         &pll0_clk),
@@ -350,6 +357,7 @@ static struct davinci_clk da850_clks[] = {
         CLK("davinci-mcasp.0",  NULL,           &mcasp_clk),
         CLK("da8xx_lcdc.0",     NULL,           &lcdc_clk),
         CLK("davinci_mmc.0",    NULL,           &mmcsd_clk),
+        CLK(NULL,               "aemif",        &aemif_clk),
         CLK(NULL,               NULL,           NULL),
 };
 
@@ -448,6 +456,21 @@ static const struct mux_config da850_pins[] = {
         MUX_CFG(DA850, MMCSD0_DAT_3,    10,     20,     15,     2,      false)
         MUX_CFG(DA850, MMCSD0_CLK,      10,     0,      15,     2,      false)
         MUX_CFG(DA850, MMCSD0_CMD,      10,     4,      15,     2,      false)
+        /* EMIF2.5/EMIFA function */
+        MUX_CFG(DA850, EMA_D_7,         9,      0,      15,     1,      false)
+        MUX_CFG(DA850, EMA_D_6,         9,      4,      15,     1,      false)
+        MUX_CFG(DA850, EMA_D_5,         9,      8,      15,     1,      false)
+        MUX_CFG(DA850, EMA_D_4,         9,      12,     15,     1,      false)
+        MUX_CFG(DA850, EMA_D_3,         9,      16,     15,     1,      false)
+        MUX_CFG(DA850, EMA_D_2,         9,      20,     15,     1,      false)
+        MUX_CFG(DA850, EMA_D_1,         9,      24,     15,     1,      false)
+        MUX_CFG(DA850, EMA_D_0,         9,      28,     15,     1,      false)
+        MUX_CFG(DA850, EMA_A_1,         12,     24,     15,     1,      false)
+        MUX_CFG(DA850, EMA_A_2,         12,     20,     15,     1,      false)
+        MUX_CFG(DA850, NEMA_CS_3,       7,      4,      15,     1,      false)
+        MUX_CFG(DA850, NEMA_CS_4,       7,      8,      15,     1,      false)
+        MUX_CFG(DA850, NEMA_WE,         7,      16,     15,     1,      false)
+        MUX_CFG(DA850, NEMA_OE,         7,      20,     15,     1,      false)
         /* GPIO function */
         MUX_CFG(DA850, GPIO2_15,        5,      0,      15,     8,      false)
         MUX_CFG(DA850, GPIO8_10,        18,     28,     15,     8,      false)
@@ -514,6 +537,14 @@ const short da850_mmcsd0_pins[] __initdata = {
         -1
 };
 
+const short da850_nand_pins[] __initdata = {
+        DA850_EMA_D_7, DA850_EMA_D_6, DA850_EMA_D_5, DA850_EMA_D_4,
+        DA850_EMA_D_3, DA850_EMA_D_2, DA850_EMA_D_1, DA850_EMA_D_0,
+        DA850_EMA_A_1, DA850_EMA_A_2, DA850_NEMA_CS_3, DA850_NEMA_CS_4,
+        DA850_NEMA_WE, DA850_NEMA_OE,
+        -1
+};
+
 /* FIQ are pri 0-1; otherwise 2-7, with 7 lowest priority */
 static u8 da850_default_priorities[DA850_N_CP_INTC_IRQ] = {
         [IRQ_DA8XX_COMMTX]              = 7,
diff --git a/arch/arm/mach-davinci/include/mach/da8xx.h b/arch/arm/mach-davinci/include/mach/da8xx.h
index 0af141ffc3b4..77e5d2398e21 100644
--- a/arch/arm/mach-davinci/include/mach/da8xx.h
+++ b/arch/arm/mach-davinci/include/mach/da8xx.h
@@ -40,6 +40,8 @@
 #define DA8XX_PSC1_BASE         0x01e27000
 #define DA8XX_LCD_CNTRL_BASE    0x01e13000
 #define DA8XX_MMCSD0_BASE       0x01c40000
+#define DA8XX_AEMIF_CS3_BASE    0x62000000
+#define DA8XX_AEMIF_CTL_BASE    0x68000000
 
 #define PINMUX0                 0x00
 #define PINMUX1                 0x04
@@ -110,6 +112,7 @@ extern const short da850_cpgmac_pins[];
 extern const short da850_mcasp_pins[];
 extern const short da850_lcdcntl_pins[];
 extern const short da850_mmcsd0_pins[];
+extern const short da850_nand_pins[];
 
 int da8xx_pinmux_setup(const short pins[]);
 
diff --git a/arch/arm/mach-davinci/include/mach/mux.h b/arch/arm/mach-davinci/include/mach/mux.h
index b2335640c222..ee6f29db4452 100644
--- a/arch/arm/mach-davinci/include/mach/mux.h
+++ b/arch/arm/mach-davinci/include/mach/mux.h
@@ -806,6 +806,22 @@ enum davinci_da850_index {
         DA850_MMCSD0_CLK,
         DA850_MMCSD0_CMD,
 
+        /* EMIF2.5/EMIFA function */
+        DA850_EMA_D_7,
+        DA850_EMA_D_6,
+        DA850_EMA_D_5,
+        DA850_EMA_D_4,
+        DA850_EMA_D_3,
+        DA850_EMA_D_2,
+        DA850_EMA_D_1,
+        DA850_EMA_D_0,
+        DA850_EMA_A_1,
+        DA850_EMA_A_2,
+        DA850_NEMA_CS_3,
+        DA850_NEMA_CS_4,
+        DA850_NEMA_WE,
+        DA850_NEMA_OE,
+
         /* GPIO function */
         DA850_GPIO2_15,
         DA850_GPIO8_10,