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"
26
27#define FUSE_UID_LOW		0x108
28#define FUSE_UID_HIGH		0x10c
29#define FUSE_SKU_INFO		0x110
30#define FUSE_SPARE_BIT		0x200
31
32static inline u32 fuse_readl(unsigned long offset)
33{
34	return readl(IO_TO_VIRT(TEGRA_FUSE_BASE + offset));
35}
36
37static inline void fuse_writel(u32 value, unsigned long offset)
38{
39	writel(value, IO_TO_VIRT(TEGRA_FUSE_BASE + offset));
40}
41
42void tegra_init_fuse(void)
43{
44	u32 reg = readl(IO_TO_VIRT(TEGRA_CLK_RESET_BASE + 0x48));
45	reg |= 1 << 28;
46	writel(reg, IO_TO_VIRT(TEGRA_CLK_RESET_BASE + 0x48));
47
48	pr_info("Tegra SKU: %d CPU Process: %d Core Process: %d\n",
49		tegra_sku_id(), tegra_cpu_process_id(),
50		tegra_core_process_id());
51}
52
53unsigned long long tegra_chip_uid(void)
54{
55	unsigned long long lo, hi;
56
57	lo = fuse_readl(FUSE_UID_LOW);
58	hi = fuse_readl(FUSE_UID_HIGH);
59	return (hi << 32ull) | lo;
60}
61
62int tegra_sku_id(void)
63{
64	int sku_id;
65	u32 reg = fuse_readl(FUSE_SKU_INFO);
66	sku_id = reg & 0xFF;
67	return sku_id;
68}
69
70int tegra_cpu_process_id(void)
71{
72	int cpu_process_id;
73	u32 reg = fuse_readl(FUSE_SPARE_BIT);
74	cpu_process_id = (reg >> 6) & 3;
75	return cpu_process_id;
76}
77
78int tegra_core_process_id(void)
79{
80	int core_process_id;
81	u32 reg = fuse_readl(FUSE_SPARE_BIT);
82	core_process_id = (reg >> 12) & 3;
83	return core_process_id;
84}