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