LXR uboot/arch/arm/cpu/pxa/cpuinfo.c

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * PXA CPU information display
   4 *
   5 * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
   6 */
   7
   8#include <common.h>
   9#include <init.h>
  10#include <asm/io.h>
  11#include <errno.h>
  12#include <linux/compiler.h>
  13
  14#ifdef CONFIG_CPU_PXA25X
  15#if ((CONFIG_SYS_INIT_SP_ADDR) != 0xfffff800)
  16#error "Init SP address must be set to 0xfffff800 for PXA250"
  17#endif
  18#endif
  19
  20#define CPU_MASK_PXA_PRODID     0x000003f0
  21#define CPU_MASK_PXA_REVID      0x0000000f
  22
  23#define CPU_MASK_PRODREV        (CPU_MASK_PXA_PRODID | CPU_MASK_PXA_REVID)
  24
  25#define CPU_VALUE_PXA25X        0x100
  26#define CPU_VALUE_PXA27X        0x110
  27
  28static uint32_t pxa_get_cpuid(void)
  29{
  30        uint32_t cpuid;
  31        asm volatile("mrc p15, 0, %0, c0, c0, 0" : "=r"(cpuid));
  32        return cpuid;
  33}
  34
  35int cpu_is_pxa25x(void)
  36{
  37        uint32_t id = pxa_get_cpuid();
  38        id &= CPU_MASK_PXA_PRODID;
  39        return id == CPU_VALUE_PXA25X;
  40}
  41
  42int cpu_is_pxa27x(void)
  43{
  44        uint32_t id = pxa_get_cpuid();
  45        id &= CPU_MASK_PXA_PRODID;
  46        return id == CPU_VALUE_PXA27X;
  47}
  48
  49int cpu_is_pxa27xm(void)
  50{
  51        uint32_t id = pxa_get_cpuid();
  52        return ((id & CPU_MASK_PXA_PRODID) == CPU_VALUE_PXA27X) &&
  53                        ((id & CPU_MASK_PXA_REVID) == 8);
  54}
  55
  56uint32_t pxa_get_cpu_revision(void)
  57{
  58        return pxa_get_cpuid() & CPU_MASK_PRODREV;
  59}
  60
  61#ifdef  CONFIG_DISPLAY_CPUINFO
  62static const char *pxa25x_get_revision(void)
  63{
  64        static __maybe_unused const char * const revs_25x[] = { "A0" };
  65        static __maybe_unused const char * const revs_26x[] = {
  66                                                                "A0", "B0", "B1"
  67                                                                };
  68        static const char *unknown = "Unknown";
  69        uint32_t id;
  70
  71        if (!cpu_is_pxa25x())
  72                return unknown;
  73
  74        id = pxa_get_cpuid() & CPU_MASK_PXA_REVID;
  75
  76/* PXA26x is a sick special case as it can't be told apart from PXA25x :-( */
  77#ifdef  CONFIG_CPU_PXA26X
  78        switch (id) {
  79        case 3: return revs_26x[0];
  80        case 5: return revs_26x[1];
  81        case 6: return revs_26x[2];
  82        }
  83#else
  84        if (id == 6)
  85                return revs_25x[0];
  86#endif
  87        return unknown;
  88}
  89
  90static const char *pxa27x_get_revision(void)
  91{
  92        static const char *const rev[] = { "A0", "A1", "B0", "B1", "C0", "C5" };
  93        static const char *unknown = "Unknown";
  94        uint32_t id;
  95
  96        if (!cpu_is_pxa27x())
  97                return unknown;
  98
  99        id = pxa_get_cpuid() & CPU_MASK_PXA_REVID;
 100
 101        if ((id == 5) || (id == 6) || (id > 8))
 102                return unknown;
 103
 104        /* Cap the special PXA270 C5 case. */
 105        if (id == 7)
 106                id = 5;
 107
 108        /* Cap the special PXA270M A1 case. */
 109        if (id == 8)
 110                id = 1;
 111
 112        return rev[id];
 113}
 114
 115static int print_cpuinfo_pxa2xx(void)
 116{
 117        if (cpu_is_pxa25x()) {
 118                puts("Marvell PXA25x rev. ");
 119                puts(pxa25x_get_revision());
 120        } else if (cpu_is_pxa27x()) {
 121                puts("Marvell PXA27x");
 122                if (cpu_is_pxa27xm()) puts("M");
 123                puts(" rev. ");
 124                puts(pxa27x_get_revision());
 125        } else
 126                return -EINVAL;
 127
 128        puts("\n");
 129
 130        return 0;
 131}
 132
 133int print_cpuinfo(void)
 134{
 135        int ret;
 136
 137        puts("CPU: ");
 138
 139        ret = print_cpuinfo_pxa2xx();
 140        if (!ret)
 141                return ret;
 142
 143        return ret;
 144}
 145#endif
 146