LXR linux/arch/arm/mach-imx/cpu-imx31.c

   1/*
   2 * MX31 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
  12#include <linux/module.h>
  13#include <linux/io.h>
  14
  15#include "common.h"
  16#include "hardware.h"
  17#include "iim.h"
  18
  19static int mx31_cpu_rev = -1;
  20
  21static struct {
  22        u8 srev;
  23        const char *name;
  24        unsigned int rev;
  25} mx31_cpu_type[] = {
  26        { .srev = 0x00, .name = "i.MX31(L)", .rev = IMX_CHIP_REVISION_1_0 },
  27        { .srev = 0x10, .name = "i.MX31",    .rev = IMX_CHIP_REVISION_1_1 },
  28        { .srev = 0x11, .name = "i.MX31L",   .rev = IMX_CHIP_REVISION_1_1 },
  29        { .srev = 0x12, .name = "i.MX31",    .rev = IMX_CHIP_REVISION_1_1 },
  30        { .srev = 0x13, .name = "i.MX31L",   .rev = IMX_CHIP_REVISION_1_1 },
  31        { .srev = 0x14, .name = "i.MX31",    .rev = IMX_CHIP_REVISION_1_2 },
  32        { .srev = 0x15, .name = "i.MX31L",   .rev = IMX_CHIP_REVISION_1_2 },
  33        { .srev = 0x28, .name = "i.MX31",    .rev = IMX_CHIP_REVISION_2_0 },
  34        { .srev = 0x29, .name = "i.MX31L",   .rev = IMX_CHIP_REVISION_2_0 },
  35};
  36
  37static int mx31_read_cpu_rev(void)
  38{
  39        u32 i, srev;
  40
  41        /* read SREV register from IIM module */
  42        srev = imx_readl(MX31_IO_ADDRESS(MX31_IIM_BASE_ADDR + MXC_IIMSREV));
  43        srev &= 0xff;
  44
  45        for (i = 0; i < ARRAY_SIZE(mx31_cpu_type); i++)
  46                if (srev == mx31_cpu_type[i].srev) {
  47                        imx_print_silicon_rev(mx31_cpu_type[i].name,
  48                                                mx31_cpu_type[i].rev);
  49                        return mx31_cpu_type[i].rev;
  50                }
  51
  52        imx_print_silicon_rev("i.MX31", IMX_CHIP_REVISION_UNKNOWN);
  53        return IMX_CHIP_REVISION_UNKNOWN;
  54}
  55
  56int mx31_revision(void)
  57{
  58        if (mx31_cpu_rev == -1)
  59                mx31_cpu_rev = mx31_read_cpu_rev();
  60
  61        return mx31_cpu_rev;
  62}
  63EXPORT_SYMBOL(mx31_revision);
  64