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 #include <mach/hardware.h>
  14 #include <mach/iim.h>
  15
  16 unsigned int mx35_cpu_rev;
  17 EXPORT_SYMBOL(mx35_cpu_rev);
  18
  19 void __init mx35_read_cpu_rev(void)
  20 {
  21         u32 rev;
  22         char *srev;
  23
  24         rev = __raw_readl(MX35_IO_ADDRESS(MX35_IIM_BASE_ADDR + MXC_IIMSREV));
  25         switch (rev) {
  26         case 0x00:
  27                 mx35_cpu_rev = IMX_CHIP_REVISION_1_0;
  28                 srev = "1.0";
  29                 break;
  30         case 0x10:
  31                 mx35_cpu_rev = IMX_CHIP_REVISION_2_0;
  32                 srev = "2.0";
  33                 break;
  34         case 0x11:
  35                 mx35_cpu_rev = IMX_CHIP_REVISION_2_1;
  36                 srev = "2.1";
  37                 break;
  38         default:
  39                 mx35_cpu_rev = IMX_CHIP_REVISION_UNKNOWN;
  40                 srev = "unknown";
  41         }
  42
  43         printk(KERN_INFO "CPU identified as i.MX35, silicon rev %s\n", srev);
  44 }