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