[deliverable/linux.git] / arch / arm / mach-tegra / fuse.c

/*
 * arch/arm/mach-tegra/fuse.c
 *
 * Copyright (C) 2010 Google, Inc.
 *
 * Author:
 *	Colin Cross <ccross@android.com>
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */

#include <linux/kernel.h>
#include <linux/io.h>

#include <mach/iomap.h>

#include "fuse.h"
#include "apbio.h"

#define FUSE_UID_LOW		0x108
#define FUSE_UID_HIGH		0x10c
#define FUSE_SKU_INFO		0x110
#define FUSE_SPARE_BIT		0x200

static inline u32 tegra_fuse_readl(unsigned long offset)
{
	return tegra_apb_readl(TEGRA_FUSE_BASE + offset);
}

void tegra_init_fuse(void)
{
	u32 reg = readl(IO_TO_VIRT(TEGRA_CLK_RESET_BASE + 0x48));
	reg |= 1 << 28;
	writel(reg, IO_TO_VIRT(TEGRA_CLK_RESET_BASE + 0x48));

	pr_info("Tegra SKU: %d CPU Process: %d Core Process: %d\n",
		tegra_sku_id(), tegra_cpu_process_id(),
		tegra_core_process_id());
}

unsigned long long tegra_chip_uid(void)
{
	unsigned long long lo, hi;

	lo = tegra_fuse_readl(FUSE_UID_LOW);
	hi = tegra_fuse_readl(FUSE_UID_HIGH);
	return (hi << 32ull) | lo;
}

int tegra_sku_id(void)
{
	int sku_id;
	u32 reg = tegra_fuse_readl(FUSE_SKU_INFO);
	sku_id = reg & 0xFF;
	return sku_id;
}

int tegra_cpu_process_id(void)
{
	int cpu_process_id;
	u32 reg = tegra_fuse_readl(FUSE_SPARE_BIT);
	cpu_process_id = (reg >> 6) & 3;
	return cpu_process_id;
}

int tegra_core_process_id(void)
{
	int core_process_id;
	u32 reg = tegra_fuse_readl(FUSE_SPARE_BIT);
	core_process_id = (reg >> 12) & 3;
	return core_process_id;
}
Commit	Line	Data
73625e3e CC	1	/*
	2	* arch/arm/mach-tegra/fuse.c
	3	*
	4	* Copyright (C) 2010 Google, Inc.
	5	*
	6	* Author:
	7	* Colin Cross <ccross@android.com>
	8	*
	9	* This software is licensed under the terms of the GNU General Public
	10	* License version 2, as published by the Free Software Foundation, and
	11	* may be copied, distributed, and modified under those terms.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	*/
	19
	20	#include <linux/kernel.h>
	21	#include <linux/io.h>
	22
	23	#include <mach/iomap.h>
	24
	25	#include "fuse.h"
d262f49d	26	#include "apbio.h"
73625e3e CC	27
	28	#define FUSE_UID_LOW 0x108
	29	#define FUSE_UID_HIGH 0x10c
	30	#define FUSE_SKU_INFO 0x110
	31	#define FUSE_SPARE_BIT 0x200
	32
d262f49d	33	static inline u32 tegra_fuse_readl(unsigned long offset)
73625e3e	34	{
d262f49d	35	return tegra_apb_readl(TEGRA_FUSE_BASE + offset);
73625e3e CC	36	}
	37
	38	void tegra_init_fuse(void)
	39	{
	40	u32 reg = readl(IO_TO_VIRT(TEGRA_CLK_RESET_BASE + 0x48));
	41	reg \|= 1 << 28;
	42	writel(reg, IO_TO_VIRT(TEGRA_CLK_RESET_BASE + 0x48));
	43
	44	pr_info("Tegra SKU: %d CPU Process: %d Core Process: %d\n",
	45	tegra_sku_id(), tegra_cpu_process_id(),
	46	tegra_core_process_id());
	47	}
	48
	49	unsigned long long tegra_chip_uid(void)
	50	{
	51	unsigned long long lo, hi;
	52
d262f49d OJ	53	lo = tegra_fuse_readl(FUSE_UID_LOW);
d262f49d OJ	54	hi = tegra_fuse_readl(FUSE_UID_HIGH);
73625e3e CC	55	return (hi << 32ull) \| lo;
	56	}
	57
	58	int tegra_sku_id(void)
	59	{
	60	int sku_id;
d262f49d	61	u32 reg = tegra_fuse_readl(FUSE_SKU_INFO);
73625e3e CC	62	sku_id = reg & 0xFF;
	63	return sku_id;
	64	}
	65
	66	int tegra_cpu_process_id(void)
	67	{
	68	int cpu_process_id;
d262f49d	69	u32 reg = tegra_fuse_readl(FUSE_SPARE_BIT);
73625e3e CC	70	cpu_process_id = (reg >> 6) & 3;
	71	return cpu_process_id;
	72	}
	73
	74	int tegra_core_process_id(void)
	75	{
	76	int core_process_id;
d262f49d	77	u32 reg = tegra_fuse_readl(FUSE_SPARE_BIT);
73625e3e CC	78	core_process_id = (reg >> 12) & 3;
	79	return core_process_id;
	80	}