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

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * MX35 CPU type detection
   4  *
   5  * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
   6  */
   7 #include <linux/module.h>
   8 #include <linux/io.h>
   9
  10 #include "hardware.h"
  11 #include "iim.h"
  12
  13 static int mx35_cpu_rev = -1;
  14
  15 static int mx35_read_cpu_rev(void)
  16 {
  17         u32 rev;
  18
  19         rev = imx_readl(MX35_IO_ADDRESS(MX35_IIM_BASE_ADDR + MXC_IIMSREV));
  20         switch (rev) {
  21         case 0x00:
  22                 return IMX_CHIP_REVISION_1_0;
  23         case 0x10:
  24                 return IMX_CHIP_REVISION_2_0;
  25         case 0x11:
  26                 return IMX_CHIP_REVISION_2_1;
  27         default:
  28                 return IMX_CHIP_REVISION_UNKNOWN;
  29         }
  30 }
  31
  32 int mx35_revision(void)
  33 {
  34         if (mx35_cpu_rev == -1)
  35                 mx35_cpu_rev = mx35_read_cpu_rev();
  36
  37         return mx35_cpu_rev;
  38 }
  39 EXPORT_SYMBOL(mx35_revision);