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 uint32_t pxa_get_cpu_revision(void) 50 { 51 return pxa_get_cpuid() & CPU_MASK_PRODREV; 52 } 53 54 #ifdef CONFIG_DISPLAY_CPUINFO 55 static const char *pxa25x_get_revision(void) 56 { 57 static __maybe_unused const char * const revs_25x[] = { "A0" }; 58 static __maybe_unused const char * const revs_26x[] = { 59 "A0", "B0", "B1" 60 }; 61 static const char *unknown = "Unknown"; 62 uint32_t id; 63 64 if (!cpu_is_pxa25x()) 65 return unknown; 66 67 id = pxa_get_cpuid() & CPU_MASK_PXA_REVID; 68 69 /* PXA26x is a sick special case as it can't be told apart from PXA25x :-( */ 70 #ifdef CONFIG_CPU_PXA26X 71 switch (id) { 72 case 3: return revs_26x[0]; 73 case 5: return revs_26x[1]; 74 case 6: return revs_26x[2]; 75 } 76 #else 77 if (id == 6) 78 return revs_25x[0]; 79 #endif 80 return unknown; 81 } 82 83 static const char *pxa27x_get_revision(void) 84 { 85 static const char *const rev[] = { "A0", "A1", "B0", "B1", "C0", "C5" }; 86 static const char *unknown = "Unknown"; 87 uint32_t id; 88 89 if (!cpu_is_pxa27x()) 90 return unknown; 91 92 id = pxa_get_cpuid() & CPU_MASK_PXA_REVID; 93 94 if ((id == 5) || (id == 6) || (id > 7)) 95 return unknown; 96 97 /* Cap the special PXA270 C5 case. */ 98 if (id == 7) 99 id = 5; 100 101 return rev[id]; 102 } 103 104 static int print_cpuinfo_pxa2xx(void) 105 { 106 if (cpu_is_pxa25x()) { 107 puts("Marvell PXA25x rev. "); 108 puts(pxa25x_get_revision()); 109 } else if (cpu_is_pxa27x()) { 110 puts("Marvell PXA27x rev. "); 111 puts(pxa27x_get_revision()); 112 } else 113 return -EINVAL; 114 115 puts("\n"); 116 117 return 0; 118 } 119 120 int print_cpuinfo(void) 121 { 122 int ret; 123 124 puts("CPU: "); 125 126 ret = print_cpuinfo_pxa2xx(); 127 if (!ret) 128 return ret; 129 130 return ret; 131 } 132 #endif 133