arch/arm/mach-ux500/id.c

   1 /*
   2  * Copyright (C) ST-Ericsson SA 2010
   3  *
   4  * Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
   5  * License terms: GNU General Public License (GPL) version 2
   6  */
   7
   8 #include <linux/kernel.h>
   9 #include <linux/init.h>
  10 #include <linux/io.h>
  11
  12 #include <asm/cputype.h>
  13 #include <asm/tlbflush.h>
  14 #include <asm/cacheflush.h>
  15 #include <asm/mach/map.h>
  16
  17 #include <mach/hardware.h>
  18 #include <mach/setup.h>
  19
  20 struct dbx500_asic_id dbx500_id;
  21
  22 static unsigned int ux500_read_asicid(phys_addr_t addr)
  23 {
  24         phys_addr_t base = addr & ~0xfff;
  25         struct map_desc desc = {
  26                 .virtual        = IO_ADDRESS(base),
  27                 .pfn            = __phys_to_pfn(base),
  28                 .length         = SZ_16K,
  29                 .type           = MT_DEVICE,
  30         };
  31
  32         iotable_init(&desc, 1);
  33
  34         /* As in devicemaps_init() */
  35         local_flush_tlb_all();
  36         flush_cache_all();
  37
  38         return readl(__io_address(addr));
  39 }
  40
  41 static void ux500_print_soc_info(unsigned int asicid)
  42 {
  43         unsigned int rev = dbx500_revision();
  44
  45         pr_info("DB%4x ", dbx500_partnumber());
  46
  47         if (rev == 0x01)
  48                 pr_cont("Early Drop");
  49         else if (rev >= 0xA0)
  50                 pr_cont("v%d.%d" , (rev >> 4) - 0xA + 1, rev & 0xf);
  51         else
  52                 pr_cont("Unknown");
  53
  54         pr_cont(" [%#010x]\n", asicid);
  55 }
  56
  57 static unsigned int partnumber(unsigned int asicid)
  58 {
  59         return (asicid >> 8) & 0xffff;
  60 }
  61
  62 /*
  63  * SOC          MIDR            ASICID ADDRESS          ASICID VALUE
  64  * DB8500ed     0x410fc090      0x9001FFF4              0x00850001
  65  * DB8500v1     0x411fc091      0x9001FFF4              0x008500A0
  66  * DB8500v1.1   0x411fc091      0x9001FFF4              0x008500A1
  67  * DB8500v2     0x412fc091      0x9001DBF4              0x008500B0
  68  * DB8520v2.2   0x412fc091      0x9001DBF4              0x008500B2
  69  * DB5500v1     0x412fc091      0x9001FFF4              0x005500A0
  70  */
  71
  72 void __init ux500_map_io(void)
  73 {
  74         unsigned int cpuid = read_cpuid_id();
  75         unsigned int asicid = 0;
  76         phys_addr_t addr = 0;
  77
  78         switch (cpuid) {
  79         case 0x410fc090: /* DB8500ed */
  80         case 0x411fc091: /* DB8500v1 */
  81                 addr = 0x9001FFF4;
  82                 break;
  83
  84         case 0x412fc091: /* DB8520 / DB8500v2 / DB5500v1 */
  85                 asicid = ux500_read_asicid(0x9001DBF4);
  86                 if (partnumber(asicid) == 0x8500 ||
  87                     partnumber(asicid) == 0x8520)
  88                         /* DB8500v2 */
  89                         break;
  90
  91                 /* DB5500v1 */
  92                 addr = 0x9001FFF4;
  93                 break;
  94         }
  95
  96         if (addr)
  97                 asicid = ux500_read_asicid(addr);
  98
  99         if (!asicid) {
 100                 pr_err("Unable to identify SoC\n");
 101                 ux500_unknown_soc();
 102         }
 103
 104         dbx500_id.process = asicid >> 24;
 105         dbx500_id.partnumber = partnumber(asicid);
 106         dbx500_id.revision = asicid & 0xff;
 107
 108         ux500_print_soc_info(asicid);
 109 }