arch/arm/mach-omap1/board-nand.c

   1 /*
   2  * linux/arch/arm/mach-omap1/board-nand.c
   3  *
   4  * Common OMAP1 board NAND code
   5  *
   6  * Copyright (C) 2004, 2012 Texas Instruments, Inc.
   7  * Copyright (C) 2002 MontaVista Software, Inc.
   8  * Copyright (C) 2001 RidgeRun, Inc.
   9  * Author: RidgeRun, Inc.
  10  *         Greg Lonnon (glonnon@ridgerun.com) or info@ridgerun.com
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License version 2 as
  14  * published by the Free Software Foundation.
  15  */
  16 #include <linux/kernel.h>
  17 #include <linux/io.h>
  18 #include <linux/mtd/mtd.h>
  19 #include <linux/mtd/nand.h>
  20
  21 #include "common.h"
  22
  23 void omap1_nand_cmd_ctl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
  24 {
  25         struct nand_chip *this = mtd_to_nand(mtd);
  26         unsigned long mask;
  27
  28         if (cmd == NAND_CMD_NONE)
  29                 return;
  30
  31         mask = (ctrl & NAND_CLE) ? 0x02 : 0;
  32         if (ctrl & NAND_ALE)
  33                 mask |= 0x04;
  34
  35         writeb(cmd, this->IO_ADDR_W + mask);
  36 }
  37