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 #include <mach/hardware.h>
  15 #include <mach/iim.h>
  16
  17 unsigned int mx31_cpu_rev;
  18 EXPORT_SYMBOL(mx31_cpu_rev);
  19
  20 static struct {
  21         u8 srev;
  22         const char *name;
  23         const char *v;
  24         unsigned int rev;
  25 } mx31_cpu_type[] __initdata = {
  26         { .srev = 0x00, .name = "i.MX31(L)", .v = "1.0",  .rev = IMX_CHIP_REVISION_1_0  },
  27         { .srev = 0x10, .name = "i.MX31",    .v = "1.1",  .rev = IMX_CHIP_REVISION_1_1  },
  28         { .srev = 0x11, .name = "i.MX31L",   .v = "1.1",  .rev = IMX_CHIP_REVISION_1_1  },
  29         { .srev = 0x12, .name = "i.MX31",    .v = "1.15", .rev = IMX_CHIP_REVISION_1_1  },
  30         { .srev = 0x13, .name = "i.MX31L",   .v = "1.15", .rev = IMX_CHIP_REVISION_1_1  },
  31         { .srev = 0x14, .name = "i.MX31",    .v = "1.2",  .rev = IMX_CHIP_REVISION_1_2  },
  32         { .srev = 0x15, .name = "i.MX31L",   .v = "1.2",  .rev = IMX_CHIP_REVISION_1_2  },
  33         { .srev = 0x28, .name = "i.MX31",    .v = "2.0",  .rev = IMX_CHIP_REVISION_2_0  },
  34         { .srev = 0x29, .name = "i.MX31L",   .v = "2.0",  .rev = IMX_CHIP_REVISION_2_0  },
  35 };
  36
  37 void __init mx31_read_cpu_rev(void)
  38 {
  39         u32 i, srev;
  40
  41         /* read SREV register from IIM module */
  42         srev = __raw_readl(MX31_IO_ADDRESS(MX31_IIM_BASE_ADDR + MXC_IIMSREV));
  43
  44         for (i = 0; i < ARRAY_SIZE(mx31_cpu_type); i++)
  45                 if (srev == mx31_cpu_type[i].srev) {
  46                         printk(KERN_INFO
  47                                 "CPU identified as %s, silicon rev %s\n",
  48                                 mx31_cpu_type[i].name, mx31_cpu_type[i].v);
  49
  50                         mx31_cpu_rev = mx31_cpu_type[i].rev;
  51                         return;
  52                 }
  53
  54         mx31_cpu_rev = IMX_CHIP_REVISION_UNKNOWN;
  55
  56         printk(KERN_WARNING "Unknown CPU identifier. srev = %02x\n", srev);
  57 }