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>

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",

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,

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[]);
 

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,