1 /* 2 * linux/arch/arm/mach-omap2/id.c 3 * 4 * OMAP2 CPU identification code 5 * 6 * Copyright (C) 2005 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 #if defined(CONFIG_ARCH_OMAP2420) 21 #define OMAP24XX_TAP_BASE io_p2v(0x48014000) 22 #endif 23 24 #if defined(CONFIG_ARCH_OMAP2430) 25 #define OMAP24XX_TAP_BASE io_p2v(0x4900A000) 26 #endif 27 28 #define OMAP_TAP_IDCODE 0x0204 29 #define OMAP_TAP_PROD_ID 0x0208 30 31 #define OMAP_TAP_DIE_ID_0 0x0218 32 #define OMAP_TAP_DIE_ID_1 0x021C 33 #define OMAP_TAP_DIE_ID_2 0x0220 34 #define OMAP_TAP_DIE_ID_3 0x0224 35 36 /* system_rev fields for OMAP2 processors: 37 * CPU id bits [31:16], 38 * CPU device type [15:12], (unprg,normal,POP) 39 * CPU revision [11:08] 40 * CPU class bits [07:00] 41 */ 42 43 struct omap_id { 44 u16 hawkeye; /* Silicon type (Hawkeye id) */ 45 u8 dev; /* Device type from production_id reg */ 46 u32 type; /* combined type id copied to system_rev */ 47 }; 48 49 /* Register values to detect the OMAP version */ 50 static struct omap_id omap_ids[] __initdata = { 51 { .hawkeye = 0xb5d9, .dev = 0x0, .type = 0x24200000 }, 52 { .hawkeye = 0xb5d9, .dev = 0x1, .type = 0x24201000 }, 53 { .hawkeye = 0xb5d9, .dev = 0x2, .type = 0x24202000 }, 54 { .hawkeye = 0xb5d9, .dev = 0x4, .type = 0x24220000 }, 55 { .hawkeye = 0xb5d9, .dev = 0x8, .type = 0x24230000 }, 56 { .hawkeye = 0xb68a, .dev = 0x0, .type = 0x24300000 }, 57 }; 58 59 static u32 __init read_tap_reg(int reg) 60 { 61 return __raw_readl(OMAP24XX_TAP_BASE + reg); 62 } 63 64 void __init omap2_check_revision(void) 65 { 66 int i, j; 67 u32 idcode; 68 u32 prod_id; 69 u16 hawkeye; 70 u8 dev_type; 71 u8 rev; 72 73 idcode = read_tap_reg(OMAP_TAP_IDCODE); 74 prod_id = read_tap_reg(OMAP_TAP_PROD_ID); 75 hawkeye = (idcode >> 12) & 0xffff; 76 rev = (idcode >> 28) & 0x0f; 77 dev_type = (prod_id >> 16) & 0x0f; 78 79 #ifdef DEBUG 80 printk(KERN_DEBUG "OMAP_TAP_IDCODE 0x%08x REV %i HAWKEYE 0x%04x MANF %03x\n", 81 idcode, rev, hawkeye, (idcode >> 1) & 0x7ff); 82 printk(KERN_DEBUG "OMAP_TAP_DIE_ID_0: 0x%08x\n", 83 read_tap_reg(OMAP_TAP_DIE_ID_0)); 84 printk(KERN_DEBUG "OMAP_TAP_DIE_ID_1: 0x%08x DEV_REV: %i\n", 85 read_tap_reg(OMAP_TAP_DIE_ID_1), 86 (read_tap_reg(OMAP_TAP_DIE_ID_1) >> 28) & 0xf); 87 printk(KERN_DEBUG "OMAP_TAP_DIE_ID_2: 0x%08x\n", 88 read_tap_reg(OMAP_TAP_DIE_ID_2)); 89 printk(KERN_DEBUG "OMAP_TAP_DIE_ID_3: 0x%08x\n", 90 read_tap_reg(OMAP_TAP_DIE_ID_3)); 91 printk(KERN_DEBUG "OMAP_TAP_PROD_ID_0: 0x%08x DEV_TYPE: %i\n", 92 prod_id, dev_type); 93 #endif 94 95 /* Check hawkeye ids */ 96 for (i = 0; i < ARRAY_SIZE(omap_ids); i++) { 97 if (hawkeye == omap_ids[i].hawkeye) 98 break; 99 } 100 101 if (i == ARRAY_SIZE(omap_ids)) { 102 printk(KERN_ERR "Unknown OMAP CPU id\n"); 103 return; 104 } 105 106 for (j = i; j < ARRAY_SIZE(omap_ids); j++) { 107 if (dev_type == omap_ids[j].dev) 108 break; 109 } 110 111 if (j == ARRAY_SIZE(omap_ids)) { 112 printk(KERN_ERR "Unknown OMAP device type. " 113 "Handling it as OMAP%04x\n", 114 omap_ids[i].type >> 16); 115 j = i; 116 } 117 system_rev = omap_ids[j].type; 118 119 system_rev |= rev << 8; 120 121 /* Add the cpu class info (24xx) */ 122 system_rev |= 0x24; 123 124 pr_info("OMAP%04x", system_rev >> 16); 125 if ((system_rev >> 8) & 0x0f) 126 printk("%x", (system_rev >> 8) & 0x0f); 127 printk("\n"); 128 } 129 130