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