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

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * MX31 CPU type detection
   4 *
   5 * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
   6 */
   7
   8#include <linux/module.h>
   9#include <linux/io.h>
  10
  11#include "common.h"
  12#include "hardware.h"
  13#include "iim.h"
  14
  15static int mx31_cpu_rev = -1;
  16
  17static struct {
  18        u8 srev;
  19        const char *name;
  20        unsigned int rev;
  21} mx31_cpu_type[] = {
  22        { .srev = 0x00, .name = "i.MX31(L)", .rev = IMX_CHIP_REVISION_1_0 },
  23        { .srev = 0x10, .name = "i.MX31",    .rev = IMX_CHIP_REVISION_1_1 },
  24        { .srev = 0x11, .name = "i.MX31L",   .rev = IMX_CHIP_REVISION_1_1 },
  25        { .srev = 0x12, .name = "i.MX31",    .rev = IMX_CHIP_REVISION_1_1 },
  26        { .srev = 0x13, .name = "i.MX31L",   .rev = IMX_CHIP_REVISION_1_1 },
  27        { .srev = 0x14, .name = "i.MX31",    .rev = IMX_CHIP_REVISION_1_2 },
  28        { .srev = 0x15, .name = "i.MX31L",   .rev = IMX_CHIP_REVISION_1_2 },
  29        { .srev = 0x28, .name = "i.MX31",    .rev = IMX_CHIP_REVISION_2_0 },
  30        { .srev = 0x29, .name = "i.MX31L",   .rev = IMX_CHIP_REVISION_2_0 },
  31};
  32
  33static int mx31_read_cpu_rev(void)
  34{
  35        u32 i, srev;
  36
  37        /* read SREV register from IIM module */
  38        srev = imx_readl(MX31_IO_ADDRESS(MX31_IIM_BASE_ADDR + MXC_IIMSREV));
  39        srev &= 0xff;
  40
  41        for (i = 0; i < ARRAY_SIZE(mx31_cpu_type); i++)
  42                if (srev == mx31_cpu_type[i].srev) {
  43                        imx_print_silicon_rev(mx31_cpu_type[i].name,
  44                                                mx31_cpu_type[i].rev);
  45                        return mx31_cpu_type[i].rev;
  46                }
  47
  48        imx_print_silicon_rev("i.MX31", IMX_CHIP_REVISION_UNKNOWN);
  49        return IMX_CHIP_REVISION_UNKNOWN;
  50}
  51
  52int mx31_revision(void)
  53{
  54        if (mx31_cpu_rev == -1)
  55                mx31_cpu_rev = mx31_read_cpu_rev();
  56
  57        return mx31_cpu_rev;
  58}
  59EXPORT_SYMBOL(mx31_revision);
  60