kernel/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 "setup.h"
  18
  19 #include "db8500-regs.h"
  20 #include "id.h"
  21
  22 struct dbx500_asic_id dbx500_id;
  23
  24 static unsigned int __init ux500_read_asicid(phys_addr_t addr)
  25 {
  26         phys_addr_t base = addr & ~0xfff;
  27         struct map_desc desc = {
  28                 .virtual        = (unsigned long)UX500_VIRT_ROM,
  29                 .pfn            = __phys_to_pfn(base),
  30                 .length         = SZ_16K,
  31                 .type           = MT_DEVICE,
  32         };
  33
  34         iotable_init(&desc, 1);
  35
  36         /* As in devicemaps_init() */
  37         local_flush_tlb_all();
  38         flush_cache_all();
  39
  40         return readl(UX500_VIRT_ROM + (addr & 0xfff));
  41 }
  42
  43 static void ux500_print_soc_info(unsigned int asicid)
  44 {
  45         unsigned int rev = dbx500_revision();
  46
  47         pr_info("DB%4x ", dbx500_partnumber());
  48
  49         if (rev == 0x01)
  50                 pr_cont("Early Drop");
  51         else if (rev >= 0xA0)
  52                 pr_cont("v%d.%d" , (rev >> 4) - 0xA + 1, rev & 0xf);
  53         else
  54                 pr_cont("Unknown");
  55
  56         pr_cont(" [%#010x]\n", asicid);
  57 }
  58
  59 static unsigned int partnumber(unsigned int asicid)
  60 {
  61         return (asicid >> 8) & 0xffff;
  62 }
  63
  64 /*
  65  * SOC          MIDR            ASICID ADDRESS          ASICID VALUE
  66  * DB8500ed     0x410fc090      0x9001FFF4              0x00850001
  67  * DB8500v1     0x411fc091      0x9001FFF4              0x008500A0
  68  * DB8500v1.1   0x411fc091      0x9001FFF4              0x008500A1
  69  * DB8500v2     0x412fc091      0x9001DBF4              0x008500B0
  70  * DB8520v2.2   0x412fc091      0x9001DBF4              0x008500B2
  71  * DB5500v1     0x412fc091      0x9001FFF4              0x005500A0
  72  * DB9540       0x413fc090      0xFFFFDBF4              0x009540xx
  73  */
  74
  75 void __init ux500_map_io(void)
  76 {
  77         unsigned int cpuid = read_cpuid_id();
  78         unsigned int asicid = 0;
  79         phys_addr_t addr = 0;
  80
  81         switch (cpuid) {
  82         case 0x410fc090: /* DB8500ed */
  83         case 0x411fc091: /* DB8500v1 */
  84                 addr = 0x9001FFF4;
  85                 break;
  86
  87         case 0x412fc091: /* DB8520 / DB8500v2 / DB5500v1 */
  88                 asicid = ux500_read_asicid(0x9001DBF4);
  89                 if (partnumber(asicid) == 0x8500 ||
  90                     partnumber(asicid) == 0x8520)
  91                         /* DB8500v2 */
  92                         break;
  93
  94                 /* DB5500v1 */
  95                 addr = 0x9001FFF4;
  96                 break;
  97
  98         case 0x413fc090: /* DB9540 */
  99                 addr = 0xFFFFDBF4;
 100                 break;
 101         }
 102
 103         if (addr)
 104                 asicid = ux500_read_asicid(addr);
 105
 106         if (!asicid) {
 107                 pr_err("Unable to identify SoC\n");
 108                 ux500_unknown_soc();
 109         }
 110
 111         dbx500_id.process = asicid >> 24;
 112         dbx500_id.partnumber = partnumber(asicid);
 113         dbx500_id.revision = asicid & 0xff;
 114
 115         ux500_print_soc_info(asicid);
 116 }