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
  15 static int mx31_cpu_rev = -1;
  16
  17 static 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
  33 static 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
  52 int 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 }
  59 EXPORT_SYMBOL(mx31_revision);