board/quad100hd/nand.c

   1 /*
   2  * (C) Copyright 2008
   3  * Gary Jennejohn, DENX Software Engineering GmbH, garyj@denx.de
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <config.h>
  10 #if defined(CONFIG_CMD_NAND)
  11 #include <asm/ppc4xx-gpio.h>
  12 #include <asm/io.h>
  13 #include <nand.h>
  14
  15 /*
  16  *      hardware specific access to control-lines
  17  */
  18 static void quad100hd_hwcontrol(struct mtd_info *mtd,
  19                                 int cmd, unsigned int ctrl)
  20 {
  21         struct nand_chip *this = mtd->priv;
  22
  23         if (ctrl & NAND_CTRL_CHANGE) {
  24                 gpio_write_bit(CONFIG_SYS_NAND_CLE, !!(ctrl & NAND_CLE));
  25                 gpio_write_bit(CONFIG_SYS_NAND_ALE, !!(ctrl & NAND_ALE));
  26                 gpio_write_bit(CONFIG_SYS_NAND_CE, !(ctrl & NAND_NCE));
  27         }
  28
  29         if (cmd != NAND_CMD_NONE)
  30                 writeb(cmd, this->IO_ADDR_W);
  31 }
  32
  33 static int quad100hd_nand_ready(struct mtd_info *mtd)
  34 {
  35         return gpio_read_in_bit(CONFIG_SYS_NAND_RDY);
  36 }
  37
  38 /*
  39  * Main initialization routine
  40  */
  41 int board_nand_init(struct nand_chip *nand)
  42 {
  43         /* Set address of hardware control function */
  44         nand->cmd_ctrl = quad100hd_hwcontrol;
  45         nand->dev_ready = quad100hd_nand_ready;
  46         nand->ecc.mode = NAND_ECC_SOFT;
  47         /* 15 us command delay time */
  48         nand->chip_delay =  20;
  49
  50         /* Return happy */
  51         return 0;
  52 }
  53 #endif /* CONFIG_CMD_NAND */