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 #include <asm/system_info.h> 19 20 #include <plat/cpu.h> 21 22 #include <mach/hardware.h> 23 24 #define OMAP_DIE_ID_0 0xfffe1800 25 #define OMAP_DIE_ID_1 0xfffe1804 26 #define OMAP_PRODUCTION_ID_0 0xfffe2000 27 #define OMAP_PRODUCTION_ID_1 0xfffe2004 28 #define OMAP32_ID_0 0xfffed400 29 #define OMAP32_ID_1 0xfffed404 30 31 struct omap_id { 32 u16 jtag_id; /* Used to determine OMAP type */ 33 u8 die_rev; /* Processor revision */ 34 u32 omap_id; /* OMAP revision */ 35 u32 type; /* Cpu id bits [31:08], cpu class bits [07:00] */ 36 }; 37 38 static unsigned int omap_revision; 39 40 /* Register values to detect the OMAP version */ 41 static struct omap_id omap_ids[] __initdata = { 42 { .jtag_id = 0xb574, .die_rev = 0x2, .omap_id = 0x03310315, .type = 0x03100000}, 43 { .jtag_id = 0x355f, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x07300100}, 44 { .jtag_id = 0xb55f, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x07300300}, 45 { .jtag_id = 0xb62c, .die_rev = 0x1, .omap_id = 0x03320500, .type = 0x08500000}, 46 { .jtag_id = 0xb470, .die_rev = 0x0, .omap_id = 0x03310100, .type = 0x15100000}, 47 { .jtag_id = 0xb576, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x16100000}, 48 { .jtag_id = 0xb576, .die_rev = 0x2, .omap_id = 0x03320100, .type = 0x16110000}, 49 { .jtag_id = 0xb576, .die_rev = 0x3, .omap_id = 0x03320100, .type = 0x16100c00}, 50 { .jtag_id = 0xb576, .die_rev = 0x0, .omap_id = 0x03320200, .type = 0x16100d00}, 51 { .jtag_id = 0xb613, .die_rev = 0x0, .omap_id = 0x03320300, .type = 0x1610ef00}, 52 { .jtag_id = 0xb613, .die_rev = 0x0, .omap_id = 0x03320300, .type = 0x1610ef00}, 53 { .jtag_id = 0xb576, .die_rev = 0x1, .omap_id = 0x03320100, .type = 0x16110000}, 54 { .jtag_id = 0xb58c, .die_rev = 0x2, .omap_id = 0x03320200, .type = 0x16110b00}, 55 { .jtag_id = 0xb58c, .die_rev = 0x3, .omap_id = 0x03320200, .type = 0x16110c00}, 56 { .jtag_id = 0xb65f, .die_rev = 0x0, .omap_id = 0x03320400, .type = 0x16212300}, 57 { .jtag_id = 0xb65f, .die_rev = 0x1, .omap_id = 0x03320400, .type = 0x16212300}, 58 { .jtag_id = 0xb65f, .die_rev = 0x1, .omap_id = 0x03320500, .type = 0x16212300}, 59 { .jtag_id = 0xb5f7, .die_rev = 0x0, .omap_id = 0x03330000, .type = 0x17100000}, 60 { .jtag_id = 0xb5f7, .die_rev = 0x1, .omap_id = 0x03330100, .type = 0x17100000}, 61 { .jtag_id = 0xb5f7, .die_rev = 0x2, .omap_id = 0x03330100, .type = 0x17100000}, 62 }; 63 64 unsigned int omap_rev(void) 65 { 66 return omap_revision; 67 } 68 EXPORT_SYMBOL(omap_rev); 69 70 /* 71 * Get OMAP type from PROD_ID. 72 * 1710 has the PROD_ID in bits 15:00, not in 16:01 as documented in TRM. 73 * 1510 PROD_ID is empty, and 1610 PROD_ID does not make sense. 74 * Undocumented register in TEST BLOCK is used as fallback; This seems to 75 * work on 1510, 1610 & 1710. The official way hopefully will work in future 76 * processors. 77 */ 78 static u16 __init omap_get_jtag_id(void) 79 { 80 u32 prod_id, omap_id; 81 82 prod_id = omap_readl(OMAP_PRODUCTION_ID_1); 83 omap_id = omap_readl(OMAP32_ID_1); 84 85 /* Check for unusable OMAP_PRODUCTION_ID_1 on 1611B/5912 and 730/850 */ 86 if (((prod_id >> 20) == 0) || (prod_id == omap_id)) 87 prod_id = 0; 88 else 89 prod_id &= 0xffff; 90 91 if (prod_id) 92 return prod_id; 93 94 /* Use OMAP32_ID_1 as fallback */ 95 prod_id = ((omap_id >> 12) & 0xffff); 96 97 return prod_id; 98 } 99 100 /* 101 * Get OMAP revision from DIE_REV. 102 * Early 1710 processors may have broken OMAP_DIE_ID, it contains PROD_ID. 103 * Undocumented register in the TEST BLOCK is used as fallback. 104 * REVISIT: This does not seem to work on 1510 105 */ 106 static u8 __init omap_get_die_rev(void) 107 { 108 u32 die_rev; 109 110 die_rev = omap_readl(OMAP_DIE_ID_1); 111 112 /* Check for broken OMAP_DIE_ID on early 1710 */ 113 if (((die_rev >> 12) & 0xffff) == omap_get_jtag_id()) 114 die_rev = 0; 115 116 die_rev = (die_rev >> 17) & 0xf; 117 if (die_rev) 118 return die_rev; 119 120 die_rev = (omap_readl(OMAP32_ID_1) >> 28) & 0xf; 121 122 return die_rev; 123 } 124 125 void __init omap_check_revision(void) 126 { 127 int i; 128 u16 jtag_id; 129 u8 die_rev; 130 u32 omap_id; 131 u8 cpu_type; 132 133 jtag_id = omap_get_jtag_id(); 134 die_rev = omap_get_die_rev(); 135 omap_id = omap_readl(OMAP32_ID_0); 136 137 #ifdef DEBUG 138 printk(KERN_DEBUG "OMAP_DIE_ID_0: 0x%08x\n", omap_readl(OMAP_DIE_ID_0)); 139 printk(KERN_DEBUG "OMAP_DIE_ID_1: 0x%08x DIE_REV: %i\n", 140 omap_readl(OMAP_DIE_ID_1), 141 (omap_readl(OMAP_DIE_ID_1) >> 17) & 0xf); 142 printk(KERN_DEBUG "OMAP_PRODUCTION_ID_0: 0x%08x\n", 143 omap_readl(OMAP_PRODUCTION_ID_0)); 144 printk(KERN_DEBUG "OMAP_PRODUCTION_ID_1: 0x%08x JTAG_ID: 0x%04x\n", 145 omap_readl(OMAP_PRODUCTION_ID_1), 146 omap_readl(OMAP_PRODUCTION_ID_1) & 0xffff); 147 printk(KERN_DEBUG "OMAP32_ID_0: 0x%08x\n", omap_readl(OMAP32_ID_0)); 148 printk(KERN_DEBUG "OMAP32_ID_1: 0x%08x\n", omap_readl(OMAP32_ID_1)); 149 printk(KERN_DEBUG "JTAG_ID: 0x%04x DIE_REV: %i\n", jtag_id, die_rev); 150 #endif 151 152 system_serial_high = omap_readl(OMAP_DIE_ID_0); 153 system_serial_low = omap_readl(OMAP_DIE_ID_1); 154 155 /* First check only the major version in a safe way */ 156 for (i = 0; i < ARRAY_SIZE(omap_ids); i++) { 157 if (jtag_id == (omap_ids[i].jtag_id)) { 158 omap_revision = omap_ids[i].type; 159 break; 160 } 161 } 162 163 /* Check if we can find the die revision */ 164 for (i = 0; i < ARRAY_SIZE(omap_ids); i++) { 165 if (jtag_id == omap_ids[i].jtag_id && die_rev == omap_ids[i].die_rev) { 166 omap_revision = omap_ids[i].type; 167 break; 168 } 169 } 170 171 /* Finally check also the omap_id */ 172 for (i = 0; i < ARRAY_SIZE(omap_ids); i++) { 173 if (jtag_id == omap_ids[i].jtag_id 174 && die_rev == omap_ids[i].die_rev 175 && omap_id == omap_ids[i].omap_id) { 176 omap_revision = omap_ids[i].type; 177 break; 178 } 179 } 180 181 /* Add the cpu class info (7xx, 15xx, 16xx, 24xx) */ 182 cpu_type = omap_revision >> 24; 183 184 switch (cpu_type) { 185 case 0x07: 186 case 0x08: 187 omap_revision |= 0x07; 188 break; 189 case 0x03: 190 case 0x15: 191 omap_revision |= 0x15; 192 break; 193 case 0x16: 194 case 0x17: 195 omap_revision |= 0x16; 196 break; 197 default: 198 printk(KERN_INFO "Unknown OMAP cpu type: 0x%02x\n", cpu_type); 199 } 200 201 printk(KERN_INFO "OMAP%04x", omap_revision >> 16); 202 if ((omap_revision >> 8) & 0xff) 203 printk(KERN_INFO "%x", (omap_revision >> 8) & 0xff); 204 printk(KERN_INFO " revision %i handled as %02xxx id: %08x%08x\n", 205 die_rev, omap_revision & 0xff, system_serial_low, 206 system_serial_high); 207 } 208 209