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