1 /* 2 * linux/arch/arm/mach-omap1/id.c 3 * 4 * OMAP1 CPU identification code 5 * 6 * Copyright (C) 2004 Nokia Corporation 7 * Written by Tony Lindgren <tony@atomide.com> 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 as 11 * published by the Free Software Foundation. 12 */ 13 14 #include <linux/config.h> 15 #include <linux/module.h> 16 #include <linux/kernel.h> 17 #include <linux/init.h> 18 19 #include <asm/io.h> 20 21 #define OMAP_DIE_ID_0 0xfffe1800 22 #define OMAP_DIE_ID_1 0xfffe1804 23 #define OMAP_PRODUCTION_ID_0 0xfffe2000 24 #define OMAP_PRODUCTION_ID_1 0xfffe2004 25 #define OMAP32_ID_0 0xfffed400 26 #define OMAP32_ID_1 0xfffed404 27 28 struct omap_id { 29 u16 jtag_id; /* Used to determine OMAP type */ 30 u8 die_rev; /* Processor revision */ 31 u32 omap_id; /* OMAP revision */ 32 u32 type; /* Cpu id bits [31:08], cpu class bits [07:00] */ 33 }; 34 35 /* Register values to detect the OMAP version */ 36 static struct omap_id omap_ids[] __initdata = { 37 { .jtag_id = 0xb574, .die_rev = 0x2, .omap_id = 0x03310315, .type = 0x03100000}, 38 { .jtag_id = 0x355f, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x07300100}, 39 { .jtag_id = 0xb55f, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x07300300}, 40 { .jtag_id = 0xb470, .die_rev = 0x0, .omap_id = 0x03310100, .type = 0x15100000}, 41 { .jtag_id = 0xb576, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x16100000}, 42 { .jtag_id = 0xb576, .die_rev = 0x2, .omap_id = 0x03320100, .type = 0x16110000}, 43 { .jtag_id = 0xb576, .die_rev = 0x3, .omap_id = 0x03320100, .type = 0x16100c00}, 44 { .jtag_id = 0xb576, .die_rev = 0x0, .omap_id = 0x03320200, .type = 0x16100d00}, 45 { .jtag_id = 0xb613, .die_rev = 0x0, .omap_id = 0x03320300, .type = 0x1610ef00}, 46 { .jtag_id = 0xb613, .die_rev = 0x0, .omap_id = 0x03320300, .type = 0x1610ef00}, 47 { .jtag_id = 0xb576, .die_rev = 0x1, .omap_id = 0x03320100, .type = 0x16110000}, 48 { .jtag_id = 0xb58c, .die_rev = 0x2, .omap_id = 0x03320200, .type = 0x16110b00}, 49 { .jtag_id = 0xb58c, .die_rev = 0x3, .omap_id = 0x03320200, .type = 0x16110c00}, 50 { .jtag_id = 0xb65f, .die_rev = 0x0, .omap_id = 0x03320400, .type = 0x16212300}, 51 { .jtag_id = 0xb65f, .die_rev = 0x1, .omap_id = 0x03320400, .type = 0x16212300}, 52 { .jtag_id = 0xb65f, .die_rev = 0x1, .omap_id = 0x03320500, .type = 0x16212300}, 53 { .jtag_id = 0xb5f7, .die_rev = 0x0, .omap_id = 0x03330000, .type = 0x17100000}, 54 { .jtag_id = 0xb5f7, .die_rev = 0x1, .omap_id = 0x03330100, .type = 0x17100000}, 55 { .jtag_id = 0xb5f7, .die_rev = 0x2, .omap_id = 0x03330100, .type = 0x17100000}, 56 }; 57 58 /* 59 * Get OMAP type from PROD_ID. 60 * 1710 has the PROD_ID in bits 15:00, not in 16:01 as documented in TRM. 61 * 1510 PROD_ID is empty, and 1610 PROD_ID does not make sense. 62 * Undocumented register in TEST BLOCK is used as fallback; This seems to 63 * work on 1510, 1610 & 1710. The official way hopefully will work in future 64 * processors. 65 */ 66 static u16 __init omap_get_jtag_id(void) 67 { 68 u32 prod_id, omap_id; 69 70 prod_id = omap_readl(OMAP_PRODUCTION_ID_1); 71 omap_id = omap_readl(OMAP32_ID_1); 72 73 /* Check for unusable OMAP_PRODUCTION_ID_1 on 1611B/5912 and 730 */ 74 if (((prod_id >> 20) == 0) || (prod_id == omap_id)) 75 prod_id = 0; 76 else 77 prod_id &= 0xffff; 78 79 if (prod_id) 80 return prod_id; 81 82 /* Use OMAP32_ID_1 as fallback */ 83 prod_id = ((omap_id >> 12) & 0xffff); 84 85 return prod_id; 86 } 87 88 /* 89 * Get OMAP revision from DIE_REV. 90 * Early 1710 processors may have broken OMAP_DIE_ID, it contains PROD_ID. 91 * Undocumented register in the TEST BLOCK is used as fallback. 92 * REVISIT: This does not seem to work on 1510 93 */ 94 static u8 __init omap_get_die_rev(void) 95 { 96 u32 die_rev; 97 98 die_rev = omap_readl(OMAP_DIE_ID_1); 99 100 /* Check for broken OMAP_DIE_ID on early 1710 */ 101 if (((die_rev >> 12) & 0xffff) == omap_get_jtag_id()) 102 die_rev = 0; 103 104 die_rev = (die_rev >> 17) & 0xf; 105 if (die_rev) 106 return die_rev; 107 108 die_rev = (omap_readl(OMAP32_ID_1) >> 28) & 0xf; 109 110 return die_rev; 111 } 112 113 void __init omap_check_revision(void) 114 { 115 int i; 116 u16 jtag_id; 117 u8 die_rev; 118 u32 omap_id; 119 u8 cpu_type; 120 121 jtag_id = omap_get_jtag_id(); 122 die_rev = omap_get_die_rev(); 123 omap_id = omap_readl(OMAP32_ID_0); 124 125 #ifdef DEBUG 126 printk("OMAP_DIE_ID_0: 0x%08x\n", omap_readl(OMAP_DIE_ID_0)); 127 printk("OMAP_DIE_ID_1: 0x%08x DIE_REV: %i\n", 128 omap_readl(OMAP_DIE_ID_1), 129 (omap_readl(OMAP_DIE_ID_1) >> 17) & 0xf); 130 printk("OMAP_PRODUCTION_ID_0: 0x%08x\n", omap_readl(OMAP_PRODUCTION_ID_0)); 131 printk("OMAP_PRODUCTION_ID_1: 0x%08x JTAG_ID: 0x%04x\n", 132 omap_readl(OMAP_PRODUCTION_ID_1), 133 omap_readl(OMAP_PRODUCTION_ID_1) & 0xffff); 134 printk("OMAP32_ID_0: 0x%08x\n", omap_readl(OMAP32_ID_0)); 135 printk("OMAP32_ID_1: 0x%08x\n", omap_readl(OMAP32_ID_1)); 136 printk("JTAG_ID: 0x%04x DIE_REV: %i\n", jtag_id, die_rev); 137 #endif 138 139 system_serial_high = omap_readl(OMAP_DIE_ID_0); 140 system_serial_low = omap_readl(OMAP_DIE_ID_1); 141 142 /* First check only the major version in a safe way */ 143 for (i = 0; i < ARRAY_SIZE(omap_ids); i++) { 144 if (jtag_id == (omap_ids[i].jtag_id)) { 145 system_rev = omap_ids[i].type; 146 break; 147 } 148 } 149 150 /* Check if we can find the die revision */ 151 for (i = 0; i < ARRAY_SIZE(omap_ids); i++) { 152 if (jtag_id == omap_ids[i].jtag_id && die_rev == omap_ids[i].die_rev) { 153 system_rev = omap_ids[i].type; 154 break; 155 } 156 } 157 158 /* Finally check also the omap_id */ 159 for (i = 0; i < ARRAY_SIZE(omap_ids); i++) { 160 if (jtag_id == omap_ids[i].jtag_id 161 && die_rev == omap_ids[i].die_rev 162 && omap_id == omap_ids[i].omap_id) { 163 system_rev = omap_ids[i].type; 164 break; 165 } 166 } 167 168 /* Add the cpu class info (7xx, 15xx, 16xx, 24xx) */ 169 cpu_type = system_rev >> 24; 170 171 switch (cpu_type) { 172 case 0x07: 173 system_rev |= 0x07; 174 break; 175 case 0x03: 176 case 0x15: 177 system_rev |= 0x15; 178 break; 179 case 0x16: 180 case 0x17: 181 system_rev |= 0x16; 182 break; 183 case 0x24: 184 system_rev |= 0x24; 185 break; 186 default: 187 printk("Unknown OMAP cpu type: 0x%02x\n", cpu_type); 188 } 189 190 printk("OMAP%04x", system_rev >> 16); 191 if ((system_rev >> 8) & 0xff) 192 printk("%x", (system_rev >> 8) & 0xff); 193 printk(" revision %i handled as %02xxx id: %08x%08x\n", 194 die_rev, system_rev & 0xff, system_serial_low, 195 system_serial_high); 196 } 197 198