1dbae815a7
Patch from Tony Lindgren This patch adds support for omap24xx series of processors. The files live in arch/arm/mach-omap2, and share common files with omap15xx and omap16xx processors in arch/arm/plat-omap. Omap24xx support was originally added for 2.6.9 by TI. This code was then improved and integrated to share common code with omap15xx and omap16xx processors by various omap developers, such as Paul Mundt, Juha Yrjola, Imre Deak, Tony Lindgren, Richard Woodruff, Nishant Menon, Komal Shah et al. Signed-off-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
125 lines
3.2 KiB
C
125 lines
3.2 KiB
C
/*
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* linux/arch/arm/mach-omap2/id.c
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*
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* OMAP2 CPU identification code
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*
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* Copyright (C) 2005 Nokia Corporation
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* Written by Tony Lindgren <tony@atomide.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <asm/io.h>
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#define OMAP24XX_TAP_BASE io_p2v(0x48014000)
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#define OMAP_TAP_IDCODE 0x0204
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#define OMAP_TAP_PROD_ID 0x0208
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#define OMAP_TAP_DIE_ID_0 0x0218
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#define OMAP_TAP_DIE_ID_1 0x021C
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#define OMAP_TAP_DIE_ID_2 0x0220
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#define OMAP_TAP_DIE_ID_3 0x0224
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/* system_rev fields for OMAP2 processors:
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* CPU id bits [31:16],
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* CPU device type [15:12], (unprg,normal,POP)
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* CPU revision [11:08]
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* CPU class bits [07:00]
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*/
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struct omap_id {
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u16 hawkeye; /* Silicon type (Hawkeye id) */
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u8 dev; /* Device type from production_id reg */
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u32 type; /* combined type id copied to system_rev */
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};
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/* Register values to detect the OMAP version */
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static struct omap_id omap_ids[] __initdata = {
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{ .hawkeye = 0xb5d9, .dev = 0x0, .type = 0x24200000 },
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{ .hawkeye = 0xb5d9, .dev = 0x1, .type = 0x24201000 },
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{ .hawkeye = 0xb5d9, .dev = 0x2, .type = 0x24202000 },
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{ .hawkeye = 0xb5d9, .dev = 0x4, .type = 0x24220000 },
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{ .hawkeye = 0xb5d9, .dev = 0x8, .type = 0x24230000 },
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{ .hawkeye = 0xb68a, .dev = 0x0, .type = 0x24300000 },
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};
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static u32 __init read_tap_reg(int reg)
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{
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return __raw_readl(OMAP24XX_TAP_BASE + reg);
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}
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void __init omap2_check_revision(void)
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{
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int i, j;
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u32 idcode;
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u32 prod_id;
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u16 hawkeye;
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u8 dev_type;
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u8 rev;
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idcode = read_tap_reg(OMAP_TAP_IDCODE);
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prod_id = read_tap_reg(OMAP_TAP_PROD_ID);
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hawkeye = (idcode >> 12) & 0xffff;
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rev = (idcode >> 28) & 0x0f;
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dev_type = (prod_id >> 16) & 0x0f;
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#ifdef DEBUG
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printk(KERN_DEBUG "OMAP_TAP_IDCODE 0x%08x REV %i HAWKEYE 0x%04x MANF %03x\n",
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idcode, rev, hawkeye, (idcode >> 1) & 0x7ff);
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printk(KERN_DEBUG "OMAP_TAP_DIE_ID_0: 0x%08x\n",
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read_tap_reg(OMAP_TAP_DIE_ID_0));
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printk(KERN_DEBUG "OMAP_TAP_DIE_ID_1: 0x%08x DEV_REV: %i\n",
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read_tap_reg(OMAP_TAP_DIE_ID_1),
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(read_tap_reg(OMAP_TAP_DIE_ID_1) >> 28) & 0xf);
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printk(KERN_DEBUG "OMAP_TAP_DIE_ID_2: 0x%08x\n",
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read_tap_reg(OMAP_TAP_DIE_ID_2));
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printk(KERN_DEBUG "OMAP_TAP_DIE_ID_3: 0x%08x\n",
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read_tap_reg(OMAP_TAP_DIE_ID_3));
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printk(KERN_DEBUG "OMAP_TAP_PROD_ID_0: 0x%08x DEV_TYPE: %i\n",
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prod_id, dev_type);
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#endif
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/* Check hawkeye ids */
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for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
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if (hawkeye == omap_ids[i].hawkeye)
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break;
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}
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if (i == ARRAY_SIZE(omap_ids)) {
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printk(KERN_ERR "Unknown OMAP CPU id\n");
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return;
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}
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for (j = i; j < ARRAY_SIZE(omap_ids); j++) {
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if (dev_type == omap_ids[j].dev)
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break;
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}
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if (j == ARRAY_SIZE(omap_ids)) {
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printk(KERN_ERR "Unknown OMAP device type. "
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"Handling it as OMAP%04x\n",
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omap_ids[i].type >> 16);
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j = i;
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}
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system_rev = omap_ids[j].type;
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system_rev |= rev << 8;
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/* Add the cpu class info (24xx) */
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system_rev |= 0x24;
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pr_info("OMAP%04x", system_rev >> 16);
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if ((system_rev >> 8) & 0x0f)
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printk("%x", (system_rev >> 8) & 0x0f);
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printk("\n");
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}
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