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bc1a884686
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>
65 lines
1.3 KiB
C
65 lines
1.3 KiB
C
/*
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* Genericish driver for memory mapped NAND devices
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*
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* Copyright (c) 2006-2009 Analog Devices Inc.
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* Licensed under the GPL-2 or later.
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*/
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/* Your board must implement the following macros:
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* NAND_PLAT_WRITE_CMD(chip, cmd)
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* NAND_PLAT_WRITE_ADR(chip, cmd)
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* NAND_PLAT_INIT()
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*
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* It may also implement the following:
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* NAND_PLAT_DEV_READY(chip)
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*/
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#include <common.h>
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#include <asm/io.h>
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#ifdef NAND_PLAT_GPIO_DEV_READY
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# include <asm/gpio.h>
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# define NAND_PLAT_DEV_READY(chip) gpio_get_value(NAND_PLAT_GPIO_DEV_READY)
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#endif
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#include <nand.h>
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static void plat_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
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{
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struct nand_chip *this = mtd->priv;
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if (cmd == NAND_CMD_NONE)
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return;
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if (ctrl & NAND_CLE)
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NAND_PLAT_WRITE_CMD(this, cmd);
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else
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NAND_PLAT_WRITE_ADR(this, cmd);
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}
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#ifdef NAND_PLAT_DEV_READY
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static int plat_dev_ready(struct mtd_info *mtd)
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{
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return NAND_PLAT_DEV_READY((struct nand_chip *)mtd->priv);
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}
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#else
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# define plat_dev_ready NULL
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#endif
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int board_nand_init(struct nand_chip *nand)
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{
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#ifdef NAND_PLAT_GPIO_DEV_READY
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gpio_request(NAND_PLAT_GPIO_DEV_READY, "nand-plat");
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gpio_direction_input(NAND_PLAT_GPIO_DEV_READY);
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#endif
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#ifdef NAND_PLAT_INIT
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NAND_PLAT_INIT();
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#endif
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nand->cmd_ctrl = plat_cmd_ctrl;
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nand->dev_ready = plat_dev_ready;
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nand->ecc.mode = NAND_ECC_SOFT;
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return 0;
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}
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