1 /* 2 * PXA CPU information display 3 * 4 * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com> 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License as 8 * published by the Free Software Foundation; either version 2 of 9 * the License, or (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 19 * MA 02111-1307 USA 20 */ 21 22 #include <common.h> 23 #include <asm/io.h> 24 #include <errno.h> 25 #include <linux/compiler.h> 26 27 #define CPU_MASK_PXA_PRODID 0x000003f0 28 #define CPU_MASK_PXA_REVID 0x0000000f 29 30 #define CPU_MASK_PRODREV (CPU_MASK_PXA_PRODID | CPU_MASK_PXA_REVID) 31 32 #define CPU_VALUE_PXA25X 0x100 33 #define CPU_VALUE_PXA27X 0x110 34 35 static uint32_t pxa_get_cpuid(void) 36 { 37 uint32_t cpuid; 38 asm volatile("mrc p15, 0, %0, c0, c0, 0" : "=r"(cpuid)); 39 return cpuid; 40 } 41 42 int cpu_is_pxa25x(void) 43 { 44 uint32_t id = pxa_get_cpuid(); 45 id &= CPU_MASK_PXA_PRODID; 46 return id == CPU_VALUE_PXA25X; 47 } 48 49 int cpu_is_pxa27x(void) 50 { 51 uint32_t id = pxa_get_cpuid(); 52 id &= CPU_MASK_PXA_PRODID; 53 return id == CPU_VALUE_PXA27X; 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 > 7)) 102 return unknown; 103 104 /* Cap the special PXA270 C5 case. */ 105 if (id == 7) 106 id = 5; 107 108 return rev[id]; 109 } 110 111 static int print_cpuinfo_pxa2xx(void) 112 { 113 if (cpu_is_pxa25x()) { 114 puts("Marvell PXA25x rev. "); 115 puts(pxa25x_get_revision()); 116 } else if (cpu_is_pxa27x()) { 117 puts("Marvell PXA27x rev. "); 118 puts(pxa27x_get_revision()); 119 } else 120 return -EINVAL; 121 122 puts("\n"); 123 124 return 0; 125 } 126 127 int print_cpuinfo(void) 128 { 129 int ret; 130 131 puts("CPU: "); 132 133 ret = print_cpuinfo_pxa2xx(); 134 if (!ret) 135 return ret; 136 137 return ret; 138 } 139 #endif 140