u-boot/drivers/mtd/nand/nand_plat.c
Mike Frysinger bc1a884686 mtd: nand_plat: add simple GPIO framework DEV_READY option
Make it easy to use GPIOs for the DEV_READY pin by using the common GPIO
framework.  Also make the NAND_PLAT_INIT() define optional.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Tested-by: Thomas Chou <thomas@wytron.com.tw>
2010-07-08 16:52:12 -05:00

64 lines
1.3 KiB
C

/*
* Genericish driver for memory mapped NAND devices
*
* Copyright (c) 2006-2009 Analog Devices Inc.
* Licensed under the GPL-2 or later.
*/
/* Your board must implement the following macros:
* NAND_PLAT_WRITE_CMD(chip, cmd)
* NAND_PLAT_WRITE_ADR(chip, cmd)
* NAND_PLAT_INIT()
*
* It may also implement the following:
* NAND_PLAT_DEV_READY(chip)
*/
#include <common.h>
#include <asm/io.h>
#ifdef NAND_PLAT_GPIO_DEV_READY
# include <asm/gpio.h>
# define NAND_PLAT_DEV_READY(chip) gpio_get_value(NAND_PLAT_GPIO_DEV_READY)
#endif
#include <nand.h>
static void plat_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
{
struct nand_chip *this = mtd->priv;
if (cmd == NAND_CMD_NONE)
return;
if (ctrl & NAND_CLE)
NAND_PLAT_WRITE_CMD(this, cmd);
else
NAND_PLAT_WRITE_ADR(this, cmd);
}
#ifdef NAND_PLAT_DEV_READY
static int plat_dev_ready(struct mtd_info *mtd)
{
return NAND_PLAT_DEV_READY((struct nand_chip *)mtd->priv);
}
#else
# define plat_dev_ready NULL
#endif
int board_nand_init(struct nand_chip *nand)
{
#ifdef NAND_PLAT_GPIO_DEV_READY
gpio_request(NAND_PLAT_GPIO_DEV_READY, "nand-plat");
gpio_direction_input(NAND_PLAT_GPIO_DEV_READY);
#endif
#ifdef NAND_PLAT_INIT
NAND_PLAT_INIT();
#endif
nand->cmd_ctrl = plat_cmd_ctrl;
nand->dev_ready = plat_dev_ready;
nand->ecc.mode = NAND_ECC_SOFT;
return 0;
}