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 #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 28 static 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 35 int 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 42 int 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 49 int 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 56 uint32_t pxa_get_cpu_revision(void) 57 { 58 return pxa_get_cpuid() & CPU_MASK_PRODREV; 59 } 60 61 #ifdef CONFIG_DISPLAY_CPUINFO 62 static 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 90 static 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 } 114 115 static 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 } 132 133 int 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