LXR linux/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
  22struct dbx500_asic_id dbx500_id;
  23
  24static 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
  43static 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
  59static 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
  75void __init ux500_setup_id(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}
 117