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MX31: Add support for NAND to QONG board

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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>
This commit is contained in:
Stefano Babic
2010-03-29 16:43:39 +02:00
committed by trix
parent 89b4e39e1e
commit 3f3c7d3d92
3 changed files with 101 additions and 23 deletions
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93
board/davedenx/qong/qong.c
View File

@@ -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

4
board/davedenx/qong/qong_fpga.h
View File

@@ -33,8 +33,8 @@
#define QONG_FPGA_TMS_PIN 25
#define QONG_FPGA_TDI_PIN 8
#define QONG_FPGA_TDO_PIN 7
#define QONG_FPGA_RST_PIN 16
#define QONG_FPGA_IRQ_PIN 8
#define QONG_FPGA_RST_PIN 48
#define QONG_FPGA_IRQ_PIN 40
#endif
#endif /* QONG_FPGA_H */