drivers/mtd/nand/nand_plat.c

   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
  20 #include <nand.h>
  21
  22 static void plat_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
  23 {
  24         struct nand_chip *this = mtd->priv;
  25
  26         if (cmd == NAND_CMD_NONE)
  27                 return;
  28
  29         if (ctrl & NAND_CLE)
  30                 NAND_PLAT_WRITE_CMD(this, cmd);
  31         else
  32                 NAND_PLAT_WRITE_ADR(this, cmd);
  33 }
  34
  35 #ifdef NAND_PLAT_DEV_READY
  36 static int plat_dev_ready(struct mtd_info *mtd)
  37 {
  38         return NAND_PLAT_DEV_READY((struct nand_chip *)mtd->priv);
  39 }
  40 #else
  41 # define plat_dev_ready NULL
  42 #endif
  43
  44 int board_nand_init(struct nand_chip *nand)
  45 {
  46         NAND_PLAT_INIT();
  47
  48         nand->cmd_ctrl = plat_cmd_ctrl;
  49         nand->dev_ready = plat_dev_ready;
  50         nand->ecc.mode = NAND_ECC_SOFT;
  51
  52         return 0;
  53 }