LXR linux/arch/arm/mach-imx/cpu-imx25.c

   1/*
   2 * MX25 CPU type detection
   3 *
   4 * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
   5 * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved
   6 *
   7 * This program is free software; you can redistribute it and/or modify
   8 * it under the terms of the GNU General Public License as published by
   9 * the Free Software Foundation; either version 2 of the License, or
  10 * (at your option) any later version.
  11 */
  12#include <linux/module.h>
  13#include <linux/io.h>
  14
  15#include "iim.h"
  16#include "hardware.h"
  17
  18static int mx25_cpu_rev = -1;
  19
  20static int mx25_read_cpu_rev(void)
  21{
  22        u32 rev;
  23
  24        rev = __raw_readl(MX25_IO_ADDRESS(MX25_IIM_BASE_ADDR + MXC_IIMSREV));
  25        switch (rev) {
  26        case 0x00:
  27                return IMX_CHIP_REVISION_1_0;
  28        case 0x01:
  29                return IMX_CHIP_REVISION_1_1;
  30        default:
  31                return IMX_CHIP_REVISION_UNKNOWN;
  32        }
  33}
  34
  35int mx25_revision(void)
  36{
  37        if (mx25_cpu_rev == -1)
  38                mx25_cpu_rev = mx25_read_cpu_rev();
  39
  40        return mx25_cpu_rev;
  41}
  42EXPORT_SYMBOL(mx25_revision);
  43