board/esd/common/esd405ep_nand.c

   1 /*
   2  * (C) Copyright 2007
   3  * Matthias Fuchs, esd gmbh germany, matthias.fuchs@esd-electronics.com
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9
  10 #if defined(CONFIG_CMD_NAND)
  11 #include <asm/io.h>
  12 #include <nand.h>
  13
  14 /*
  15  * hardware specific access to control-lines
  16  */
  17 static void esd405ep_nand_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
  18 {
  19         struct nand_chip *this = mtd->priv;
  20         if (ctrl & NAND_CTRL_CHANGE) {
  21                 if ( ctrl & NAND_CLE )
  22                         out_be32((void *)GPIO0_OR, in_be32((void *)GPIO0_OR) | CONFIG_SYS_NAND_CLE);
  23                 else
  24                         out_be32((void *)GPIO0_OR, in_be32((void *)GPIO0_OR) & ~CONFIG_SYS_NAND_CLE);
  25                 if ( ctrl & NAND_ALE )
  26                         out_be32((void *)GPIO0_OR, in_be32((void *)GPIO0_OR) | CONFIG_SYS_NAND_ALE);
  27                 else
  28                         out_be32((void *)GPIO0_OR, in_be32((void *)GPIO0_OR) & ~CONFIG_SYS_NAND_ALE);
  29                 if ( ctrl & NAND_NCE )
  30                         out_be32((void *)GPIO0_OR, in_be32((void *)GPIO0_OR) & ~CONFIG_SYS_NAND_CE);
  31                 else
  32                         out_be32((void *)GPIO0_OR, in_be32((void *)GPIO0_OR) | CONFIG_SYS_NAND_CE);
  33         }
  34
  35         if (cmd != NAND_CMD_NONE)
  36                 writeb(cmd, this->IO_ADDR_W);
  37 }
  38
  39
  40 /*
  41  * read device ready pin
  42  */
  43 static int esd405ep_nand_device_ready(struct mtd_info *mtdinfo)
  44 {
  45         if (in_be32((void *)GPIO0_IR) & CONFIG_SYS_NAND_RDY)
  46                 return 1;
  47         return 0;
  48 }
  49
  50
  51 int board_nand_init(struct nand_chip *nand)
  52 {
  53         /*
  54          * Set NAND-FLASH GPIO signals to defaults
  55          */
  56         out_be32((void *)GPIO0_OR, in_be32((void *)GPIO0_OR) & ~(CONFIG_SYS_NAND_CLE | CONFIG_SYS_NAND_ALE));
  57         out_be32((void *)GPIO0_OR, in_be32((void *)GPIO0_OR) | CONFIG_SYS_NAND_CE);
  58
  59         /*
  60          * Initialize nand_chip structure
  61          */
  62         nand->cmd_ctrl = esd405ep_nand_hwcontrol;
  63         nand->dev_ready = esd405ep_nand_device_ready;
  64         nand->ecc.mode = NAND_ECC_SOFT;
  65         nand->chip_delay = NAND_BIG_DELAY_US;
  66         nand->options = NAND_SAMSUNG_LP_OPTIONS;
  67         return 0;
  68 }
  69 #endif