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cpu.c

/*
 * MX3 CPU type detection
 *
 * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/module.h>
#include <linux/io.h>
#include <mach/hardware.h>
#include <mach/iim.h>

unsigned int mx31_cpu_rev;
EXPORT_SYMBOL(mx31_cpu_rev);

00020 struct mx3_cpu_type {
      u8 srev;
      const char *name;
      const char *v;
      unsigned int rev;
};

static struct mx3_cpu_type mx31_cpu_type[] __initdata = {
      { .srev = 0x00, .name = "i.MX31(L)", .v = "1.0",  .rev = IMX_CHIP_REVISION_1_0      },
      { .srev = 0x10, .name = "i.MX31",    .v = "1.1",  .rev = IMX_CHIP_REVISION_1_1      },
      { .srev = 0x11, .name = "i.MX31L",   .v = "1.1",  .rev = IMX_CHIP_REVISION_1_1      },
      { .srev = 0x12, .name = "i.MX31",    .v = "1.15", .rev = IMX_CHIP_REVISION_1_1      },
      { .srev = 0x13, .name = "i.MX31L",   .v = "1.15", .rev = IMX_CHIP_REVISION_1_1      },
      { .srev = 0x14, .name = "i.MX31",    .v = "1.2",  .rev = IMX_CHIP_REVISION_1_2      },
      { .srev = 0x15, .name = "i.MX31L",   .v = "1.2",  .rev = IMX_CHIP_REVISION_1_2      },
      { .srev = 0x28, .name = "i.MX31",    .v = "2.0",  .rev = IMX_CHIP_REVISION_2_0      },
      { .srev = 0x29, .name = "i.MX31L",   .v = "2.0",  .rev = IMX_CHIP_REVISION_2_0      },
};

void __init mx31_read_cpu_rev(void)
{
      u32 i, srev;

      /* read SREV register from IIM module */
      srev = __raw_readl(MX31_IO_ADDRESS(MX31_IIM_BASE_ADDR + MXC_IIMSREV));

      for (i = 0; i < ARRAY_SIZE(mx31_cpu_type); i++)
            if (srev == mx31_cpu_type[i].srev) {
                  printk(KERN_INFO
                        "CPU identified as %s, silicon rev %s\n",
                        mx31_cpu_type[i].name, mx31_cpu_type[i].v);

                  mx31_cpu_rev = mx31_cpu_type[i].rev;
                  return;
            }

      mx31_cpu_rev = IMX_CHIP_REVISION_UNKNOWN;

      printk(KERN_WARNING "Unknown CPU identifier. srev = %02x\n", srev);
}

unsigned int mx35_cpu_rev;
EXPORT_SYMBOL(mx35_cpu_rev);

void __init mx35_read_cpu_rev(void)
{
      u32 rev;
      char *srev;

      rev = __raw_readl(MX35_IO_ADDRESS(MX35_IIM_BASE_ADDR + MXC_IIMSREV));
      switch (rev) {
      case 0x00:
            mx35_cpu_rev = IMX_CHIP_REVISION_1_0;
            srev = "1.0";
            break;
      case 0x10:
            mx35_cpu_rev = IMX_CHIP_REVISION_2_0;
            srev = "2.0";
            break;
      case 0x11:
            mx35_cpu_rev = IMX_CHIP_REVISION_2_1;
            srev = "2.1";
            break;
      default:
            mx35_cpu_rev = IMX_CHIP_REVISION_UNKNOWN;
            srev = "unknown";
      }

      printk(KERN_INFO "CPU identified as i.MX35, silicon rev %s\n", srev);
}

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