LXR linux/arch/arm/mach-imx/cpu-imx35.c

   1/*
   2 * MX35 CPU type detection
   3 *
   4 * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License as published by
   8 * the Free Software Foundation; either version 2 of the License, or
   9 * (at your option) any later version.
  10 */
  11#include <linux/module.h>
  12#include <linux/io.h>
  13
  14#include "hardware.h"
  15#include "iim.h"
  16
  17static int mx35_cpu_rev = -1;
  18
  19static int mx35_read_cpu_rev(void)
  20{
  21        u32 rev;
  22
  23        rev = __raw_readl(MX35_IO_ADDRESS(MX35_IIM_BASE_ADDR + MXC_IIMSREV));
  24        switch (rev) {
  25        case 0x00:
  26                return IMX_CHIP_REVISION_1_0;
  27        case 0x10:
  28                return IMX_CHIP_REVISION_2_0;
  29        case 0x11:
  30                return IMX_CHIP_REVISION_2_1;
  31        default:
  32                return IMX_CHIP_REVISION_UNKNOWN;
  33        }
  34}
  35
  36int mx35_revision(void)
  37{
  38        if (mx35_cpu_rev == -1)
  39                mx35_cpu_rev = mx35_read_cpu_rev();
  40
  41        return mx35_cpu_rev;
  42}
  43EXPORT_SYMBOL(mx35_revision);
  44