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 127