arch/arm/cpu/pxa/cpuinfo.c

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