/* * linux/arch/arm/mach-omap2/id.c * * OMAP2 CPU identification code * * Copyright (C) 2005 Nokia Corporation * Written by Tony Lindgren <tony@atomide.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/init.h> #include <asm/io.h> #define OMAP24XX_TAP_BASE io_p2v(0x48014000) #define OMAP_TAP_IDCODE 0x0204 #define OMAP_TAP_PROD_ID 0x0208 #define OMAP_TAP_DIE_ID_0 0x0218 #define OMAP_TAP_DIE_ID_1 0x021C #define OMAP_TAP_DIE_ID_2 0x0220 #define OMAP_TAP_DIE_ID_3 0x0224 /* system_rev fields for OMAP2 processors: * CPU id bits [31:16], * CPU device type [15:12], (unprg,normal,POP) * CPU revision [11:08] * CPU class bits [07:00] */ struct omap_id { u16 hawkeye; /* Silicon type (Hawkeye id) */ u8 dev; /* Device type from production_id reg */ u32 type; /* combined type id copied to system_rev */ }; /* Register values to detect the OMAP version */ static struct omap_id omap_ids[] __initdata = { { .hawkeye = 0xb5d9, .dev = 0x0, .type = 0x24200000 }, { .hawkeye = 0xb5d9, .dev = 0x1, .type = 0x24201000 }, { .hawkeye = 0xb5d9, .dev = 0x2, .type = 0x24202000 }, { .hawkeye = 0xb5d9, .dev = 0x4, .type = 0x24220000 }, { .hawkeye = 0xb5d9, .dev = 0x8, .type = 0x24230000 }, { .hawkeye = 0xb68a, .dev = 0x0, .type = 0x24300000 }, }; static u32 __init read_tap_reg(int reg) { return __raw_readl(OMAP24XX_TAP_BASE + reg); } void __init omap2_check_revision(void) { int i, j; u32 idcode; u32 prod_id; u16 hawkeye; u8 dev_type; u8 rev; idcode = read_tap_reg(OMAP_TAP_IDCODE); prod_id = read_tap_reg(OMAP_TAP_PROD_ID); hawkeye = (idcode >> 12) & 0xffff; rev = (idcode >> 28) & 0x0f; dev_type = (prod_id >> 16) & 0x0f; #ifdef DEBUG printk(KERN_DEBUG "OMAP_TAP_IDCODE 0x%08x REV %i HAWKEYE 0x%04x MANF %03x\n", idcode, rev, hawkeye, (idcode >> 1) & 0x7ff); printk(KERN_DEBUG "OMAP_TAP_DIE_ID_0: 0x%08x\n", read_tap_reg(OMAP_TAP_DIE_ID_0)); printk(KERN_DEBUG "OMAP_TAP_DIE_ID_1: 0x%08x DEV_REV: %i\n", read_tap_reg(OMAP_TAP_DIE_ID_1), (read_tap_reg(OMAP_TAP_DIE_ID_1) >> 28) & 0xf); printk(KERN_DEBUG "OMAP_TAP_DIE_ID_2: 0x%08x\n", read_tap_reg(OMAP_TAP_DIE_ID_2)); printk(KERN_DEBUG "OMAP_TAP_DIE_ID_3: 0x%08x\n", read_tap_reg(OMAP_TAP_DIE_ID_3)); printk(KERN_DEBUG "OMAP_TAP_PROD_ID_0: 0x%08x DEV_TYPE: %i\n", prod_id, dev_type); #endif /* Check hawkeye ids */ for (i = 0; i < ARRAY_SIZE(omap_ids); i++) { if (hawkeye == omap_ids[i].hawkeye) break; } if (i == ARRAY_SIZE(omap_ids)) { printk(KERN_ERR "Unknown OMAP CPU id\n"); return; } for (j = i; j < ARRAY_SIZE(omap_ids); j++) { if (dev_type == omap_ids[j].dev) break; } if (j == ARRAY_SIZE(omap_ids)) { printk(KERN_ERR "Unknown OMAP device type. " "Handling it as OMAP%04x\n", omap_ids[i].type >> 16); j = i; } system_rev = omap_ids[j].type; system_rev |= rev << 8; /* Add the cpu class info (24xx) */ system_rev |= 0x24; pr_info("OMAP%04x", system_rev >> 16); if ((system_rev >> 8) & 0x0f) printk("%x", (system_rev >> 8) & 0x0f); printk("\n"); }