LXR uboot/drivers/mtd/nand/nand

   1/*
   2 * Genericish driver for memory mapped NAND devices
   3 *
   4 * Copyright (c) 2006-2009 Analog Devices Inc.
   5 * Licensed under the GPL-2 or later.
   6 */
   7
   8/* Your board must implement the following macros:
   9 *  NAND_PLAT_WRITE_CMD(chip, cmd)
  10 *  NAND_PLAT_WRITE_ADR(chip, cmd)
  11 *  NAND_PLAT_INIT()
  12 *
  13 * It may also implement the following:
  14 *  NAND_PLAT_DEV_READY(chip)
  15 */
  16
  17#include <common.h>
  18#include <asm/io.h>
  19#ifdef NAND_PLAT_GPIO_DEV_READY
  20# include <asm/gpio.h>
  21# define NAND_PLAT_DEV_READY(chip) gpio_get_value(NAND_PLAT_GPIO_DEV_READY)
  22#endif
  23
  24#include <nand.h>
  25
  26static void plat_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
  27{
  28        struct nand_chip *this = mtd->priv;
  29
  30        if (cmd == NAND_CMD_NONE)
  31                return;
  32
  33        if (ctrl & NAND_CLE)
  34                NAND_PLAT_WRITE_CMD(this, cmd);
  35        else
  36                NAND_PLAT_WRITE_ADR(this, cmd);
  37}
  38
  39#ifdef NAND_PLAT_DEV_READY
  40static int plat_dev_ready(struct mtd_info *mtd)
  41{
  42        return NAND_PLAT_DEV_READY((struct nand_chip *)mtd->priv);
  43}
  44#else
  45# define plat_dev_ready NULL
  46#endif
  47
  48int board_nand_init(struct nand_chip *nand)
  49{
  50#ifdef NAND_PLAT_GPIO_DEV_READY
  51        gpio_request(NAND_PLAT_GPIO_DEV_READY, "nand-plat");
  52        gpio_direction_input(NAND_PLAT_GPIO_DEV_READY);
  53#endif
  54
  55#ifdef NAND_PLAT_INIT
  56        NAND_PLAT_INIT();
  57#endif
  58
  59        nand->cmd_ctrl = plat_cmd_ctrl;
  60        nand->dev_ready = plat_dev_ready;
  61        nand->ecc.mode = NAND_ECC_SOFT;
  62
  63        return 0;
  64}
  65