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/*
* 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");
}
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