MX31: Add support for NAND to QONG board

The NAND device is connected to the FPGA of the QONG board
and not to the NFC controller. For this reason, the FPGA must
be set and initialized before accessing to the NAND itself.

Signed-off-by: Stefano Babic <sbabic@denx.de>

1 files changed, 72 insertions, 21 deletions

diff --git a/board/davedenx/qong/qong.c b/board/davedenx/qong/qong.c
index b801150036..e73d26b8f6 100644
--- a/board/davedenx/qong/qong.c
+++ b/board/davedenx/qong/qong.c
@@ -25,6 +25,7 @@
 #include <netdev.h>
 #include <asm/arch/mx31.h>
 #include <asm/arch/mx31-regs.h>
+#include <nand.h>
 #include "qong_fpga.h"
 
 DECLARE_GLOBAL_DATA_PTR;
@@ -38,6 +39,15 @@ int dram_init (void)
 	return 0;
 }
 
+static void qong_fpga_reset(void)
+{
+	mx31_gpio_set(QONG_FPGA_RST_PIN, 0);
+	udelay(30);
+	mx31_gpio_set(QONG_FPGA_RST_PIN, 1);
+
+	udelay(300);
+}
+
 int board_init (void)
 {
 	/* Chip selects */
@@ -101,6 +111,15 @@ int board_init (void)
 	mx31_gpio_mux(IOMUX_MODE(0x91, MUX_CTL_OUT_FUNC | MUX_CTL_IN_GPIO));
 	mx31_gpio_mux(IOMUX_MODE(0x92, MUX_CTL_GPIO));
 	mx31_gpio_mux(IOMUX_MODE(0x93, MUX_CTL_GPIO));
+
+	/* FPGA reset  Pin */
+	/* rstn = 0 */
+	mx31_gpio_set(QONG_FPGA_RST_PIN, 0);
+	mx31_gpio_direction(QONG_FPGA_RST_PIN, MX31_GPIO_DIRECTION_OUT);
+
+	/* set interrupt pin as input */
+	mx31_gpio_direction(QONG_FPGA_IRQ_PIN, MX31_GPIO_DIRECTION_IN);
+
 #endif
 
 	/* setup pins for UART1 */
@@ -127,32 +146,11 @@ int misc_init_r (void)
 #ifdef CONFIG_QONG_FPGA
 	u32 tmp;
 
-	/* FPGA reset */
-	/* rstn = 0 */
-	tmp = __REG(GPIO2_BASE + GPIO_DR);
-	tmp &= (~(1 << QONG_FPGA_RST_PIN));
-	__REG(GPIO2_BASE + GPIO_DR) = tmp;
-	/* set the GPIO as output */
-	tmp = __REG(GPIO2_BASE + GPIO_GDIR);
-	tmp |= (1 << QONG_FPGA_RST_PIN);
-	__REG(GPIO2_BASE + GPIO_GDIR) = tmp;
-	/* wait */
-	udelay(30);
-	/* rstn = 1 */
-	tmp = __REG(GPIO2_BASE + GPIO_DR);
-	tmp |= (1 << QONG_FPGA_RST_PIN);
-	__REG(GPIO2_BASE + GPIO_DR) = tmp;
-	/* set interrupt pin as input */
-	__REG(GPIO2_BASE + GPIO_GDIR) = tmp | (1 << QONG_FPGA_IRQ_PIN);
-	/* wait while the FPGA starts */
-	udelay(300);
-
 	tmp = *(volatile u32*)QONG_FPGA_CTRL_VERSION;
 	printf("FPGA:  ");
 	printf("version register = %u.%u.%u\n",
 		(tmp & 0xF000) >> 12, (tmp & 0x0F00) >> 8, tmp & 0x00FF);
 #endif
-
 	return 0;
 }
 
@@ -164,3 +162,56 @@ int board_eth_init(bd_t *bis)
 	return 0;
 #endif
 }
+
+#if defined(CONFIG_QONG_FPGA) && defined(CONFIG_NAND_PLAT)
+static void board_nand_setup(void)
+{
+
+	/* CS3: NAND 8-bit */
+	__REG(CSCR_U(3)) = 0x00004f00;
+	__REG(CSCR_L(3)) = 0x20013b31;
+	__REG(CSCR_A(3)) = 0x00020800;
+	__REG(IOMUXC_GPR) |= 1 << 13;
+
+	mx31_gpio_mux(IOMUX_MODE(MUX_CTL_NFC_WP, MUX_CTL_IN_GPIO));
+	mx31_gpio_mux(IOMUX_MODE(MUX_CTL_NFC_CE, MUX_CTL_IN_GPIO));
+	mx31_gpio_mux(IOMUX_MODE(MUX_CTL_NFC_RB, MUX_CTL_IN_GPIO));
+
+	/* Make sure to reset the fpga else you cannot access NAND */
+	qong_fpga_reset();
+
+	/* Enable NAND flash */
+	mx31_gpio_set(15, 1);
+	mx31_gpio_set(14, 1);
+	mx31_gpio_direction(15, MX31_GPIO_DIRECTION_OUT);
+	mx31_gpio_direction(16, MX31_GPIO_DIRECTION_IN);
+	mx31_gpio_direction(14, MX31_GPIO_DIRECTION_IN);
+	mx31_gpio_set(15, 0);
+
+}
+
+int qong_nand_rdy(void *chip)
+{
+	udelay(1);
+	return mx31_gpio_get(16);
+}
+
+void qong_nand_select_chip(struct mtd_info *mtd, int chip)
+{
+	if (chip >= 0)
+		mx31_gpio_set(15, 0);
+	else
+		mx31_gpio_set(15, 1);
+
+}
+
+void qong_nand_plat_init(void *chip)
+{
+	struct nand_chip *nand = (struct nand_chip *)chip;
+	nand->chip_delay = 20;
+	nand->select_chip = qong_nand_select_chip;
+	nand->options &= ~NAND_BUSWIDTH_16;
+	board_nand_setup();
+}
+
+#endif