imx: mx53ard: Add support for NAND Flash

Add support for the Samsung K9LAG08U0M NAND Flash (2-GiB MLC NAND Flash, 2-kiB
pages, 256-kiB blocks, 30-ns R/W cycles, 1 CS) on mx53ard.

eNFC_CLK_ROOT is set up with a cycle time of 37.5 ns (400 MHz / 3 / 5) for this
board, which satisfies the 30-ns NF R/W cycle requirement.

Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
Tested-by: Fabio Estevam <fabio.estevam@freescale.com>

board/freescale/mx53ard/mx53ard.c

@@ -58,6 +58,71 @@ void dram_init_banksize(void)
 	gd->bd->bi_dram[1].size = PHYS_SDRAM_2_SIZE;
 }
 
+#ifdef CONFIG_NAND_MXC
+static void setup_iomux_nand(void)
+{
+	u32 i, reg;
+	#define M4IF_GENP_WEIM_MM_MASK		0x00000001
+	#define WEIM_GCR2_MUX16_BYP_GRANT_MASK	0x00001000
+
+	reg = __raw_readl(M4IF_BASE_ADDR + 0xc);
+	reg &= ~M4IF_GENP_WEIM_MM_MASK;
+	__raw_writel(reg, M4IF_BASE_ADDR + 0xc);
+	for (i = 0x4; i < 0x94; i += 0x18) {
+		reg = __raw_readl(WEIM_BASE_ADDR + i);
+		reg &= ~WEIM_GCR2_MUX16_BYP_GRANT_MASK;
+		__raw_writel(reg, WEIM_BASE_ADDR + i);
+	}
+
+	mxc_request_iomux(MX53_PIN_NANDF_CS0, IOMUX_CONFIG_ALT0);
+	mxc_iomux_set_pad(MX53_PIN_NANDF_CS0, PAD_CTL_DRV_HIGH);
+	mxc_request_iomux(MX53_PIN_NANDF_CS1, IOMUX_CONFIG_ALT0);
+	mxc_iomux_set_pad(MX53_PIN_NANDF_CS1, PAD_CTL_DRV_HIGH);
+	mxc_request_iomux(MX53_PIN_NANDF_RB0, IOMUX_CONFIG_ALT0);
+	mxc_iomux_set_pad(MX53_PIN_NANDF_RB0, PAD_CTL_PKE_ENABLE |
+					PAD_CTL_PUE_PULL | PAD_CTL_100K_PU);
+	mxc_request_iomux(MX53_PIN_NANDF_CLE, IOMUX_CONFIG_ALT0);
+	mxc_iomux_set_pad(MX53_PIN_NANDF_CLE, PAD_CTL_DRV_HIGH);
+	mxc_request_iomux(MX53_PIN_NANDF_ALE, IOMUX_CONFIG_ALT0);
+	mxc_iomux_set_pad(MX53_PIN_NANDF_ALE, PAD_CTL_DRV_HIGH);
+	mxc_request_iomux(MX53_PIN_NANDF_WP_B, IOMUX_CONFIG_ALT0);
+	mxc_iomux_set_pad(MX53_PIN_NANDF_WP_B, PAD_CTL_PKE_ENABLE |
+					PAD_CTL_PUE_PULL | PAD_CTL_100K_PU);
+	mxc_request_iomux(MX53_PIN_NANDF_RE_B, IOMUX_CONFIG_ALT0);
+	mxc_iomux_set_pad(MX53_PIN_NANDF_RE_B, PAD_CTL_DRV_HIGH);
+	mxc_request_iomux(MX53_PIN_NANDF_WE_B, IOMUX_CONFIG_ALT0);
+	mxc_iomux_set_pad(MX53_PIN_NANDF_WE_B, PAD_CTL_DRV_HIGH);
+	mxc_request_iomux(MX53_PIN_EIM_DA0, IOMUX_CONFIG_ALT0);
+	mxc_iomux_set_pad(MX53_PIN_EIM_DA0, PAD_CTL_PKE_ENABLE |
+					PAD_CTL_100K_PU | PAD_CTL_DRV_HIGH);
+	mxc_request_iomux(MX53_PIN_EIM_DA1, IOMUX_CONFIG_ALT0);
+	mxc_iomux_set_pad(MX53_PIN_EIM_DA1, PAD_CTL_PKE_ENABLE |
+					PAD_CTL_100K_PU | PAD_CTL_DRV_HIGH);
+	mxc_request_iomux(MX53_PIN_EIM_DA2, IOMUX_CONFIG_ALT0);
+	mxc_iomux_set_pad(MX53_PIN_EIM_DA2, PAD_CTL_PKE_ENABLE |
+					PAD_CTL_100K_PU | PAD_CTL_DRV_HIGH);
+	mxc_request_iomux(MX53_PIN_EIM_DA3, IOMUX_CONFIG_ALT0);
+	mxc_iomux_set_pad(MX53_PIN_EIM_DA3, PAD_CTL_PKE_ENABLE |
+					PAD_CTL_100K_PU | PAD_CTL_DRV_HIGH);
+	mxc_request_iomux(MX53_PIN_EIM_DA4, IOMUX_CONFIG_ALT0);
+	mxc_iomux_set_pad(MX53_PIN_EIM_DA4, PAD_CTL_PKE_ENABLE |
+					PAD_CTL_100K_PU | PAD_CTL_DRV_HIGH);
+	mxc_request_iomux(MX53_PIN_EIM_DA5, IOMUX_CONFIG_ALT0);
+	mxc_iomux_set_pad(MX53_PIN_EIM_DA5, PAD_CTL_PKE_ENABLE |
+					PAD_CTL_100K_PU | PAD_CTL_DRV_HIGH);
+	mxc_request_iomux(MX53_PIN_EIM_DA6, IOMUX_CONFIG_ALT0);
+	mxc_iomux_set_pad(MX53_PIN_EIM_DA6, PAD_CTL_PKE_ENABLE |
+					PAD_CTL_100K_PU | PAD_CTL_DRV_HIGH);
+	mxc_request_iomux(MX53_PIN_EIM_DA7, IOMUX_CONFIG_ALT0);
+	mxc_iomux_set_pad(MX53_PIN_EIM_DA7, PAD_CTL_PKE_ENABLE |
+					PAD_CTL_100K_PU | PAD_CTL_DRV_HIGH);
+}
+#else
+static void setup_iomux_nand(void)
+{
+}
+#endif
+
 static void setup_iomux_uart(void)
 {
 	/* UART1 RXD */
@@ -277,6 +342,7 @@ static void weim_cs1_settings(void)
 
 int board_early_init_f(void)
 {
+	setup_iomux_nand();
 	setup_iomux_uart();
 	return 0;
 }

include/configs/mx53ard.h

@@ -41,6 +41,16 @@
 #define CONFIG_BOARD_EARLY_INIT_F
 #define CONFIG_MXC_GPIO
 
+#define CONFIG_SYS_MAX_NAND_DEVICE	1
+#define CONFIG_SYS_NAND_BASE		NFC_BASE_ADDR_AXI
+#define CONFIG_NAND_MXC
+#define CONFIG_MXC_NAND_REGS_BASE	NFC_BASE_ADDR_AXI
+#define CONFIG_MXC_NAND_IP_REGS_BASE	NFC_BASE_ADDR
+#define CONFIG_SYS_NAND_LARGEPAGE
+#define CONFIG_MXC_NAND_HWECC
+#define CONFIG_SYS_NAND_USE_FLASH_BBT
+#define CONFIG_CMD_NAND
+
 #define CONFIG_MXC_UART
 #define CONFIG_MXC_UART_BASE	UART1_BASE