Tony Lindgren | 1dbae81 | 2005-11-10 14:26:51 +0000 | [diff] [blame] | 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 | |
Tony Lindgren | 1dbae81 | 2005-11-10 14:26:51 +0000 | [diff] [blame] | 14 | #include <linux/module.h> |
| 15 | #include <linux/kernel.h> |
| 16 | #include <linux/init.h> |
| 17 | |
| 18 | #include <asm/io.h> |
| 19 | |
Syed Mohammed Khasim | 72d0f1c | 2006-12-06 17:14:05 -0800 | [diff] [blame^] | 20 | #if defined(CONFIG_ARCH_OMAP2420) |
Tony Lindgren | 1dbae81 | 2005-11-10 14:26:51 +0000 | [diff] [blame] | 21 | #define OMAP24XX_TAP_BASE io_p2v(0x48014000) |
Syed Mohammed Khasim | 72d0f1c | 2006-12-06 17:14:05 -0800 | [diff] [blame^] | 22 | #endif |
| 23 | |
| 24 | #if defined(CONFIG_ARCH_OMAP2430) |
| 25 | #define OMAP24XX_TAP_BASE io_p2v(0x4900A000) |
| 26 | #endif |
Tony Lindgren | 1dbae81 | 2005-11-10 14:26:51 +0000 | [diff] [blame] | 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 | |