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