2 * arch/arm/mach-tegra/fuse.c
4 * Copyright (C) 2010 Google, Inc.
7 * Colin Cross <ccross@android.com>
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.
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.
20 #include <linux/kernel.h>
23 #include <mach/iomap.h>
28 #define FUSE_UID_LOW 0x108
29 #define FUSE_UID_HIGH 0x10c
30 #define FUSE_SKU_INFO 0x110
31 #define FUSE_SPARE_BIT 0x200
33 static inline u32 tegra_fuse_readl(unsigned long offset)
35 return tegra_apb_readl(TEGRA_FUSE_BASE + offset);
38 void tegra_init_fuse(void)
40 u32 reg = readl(IO_TO_VIRT(TEGRA_CLK_RESET_BASE + 0x48));
42 writel(reg, IO_TO_VIRT(TEGRA_CLK_RESET_BASE + 0x48));
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());
49 unsigned long long tegra_chip_uid(void)
51 unsigned long long lo, hi;
53 lo = tegra_fuse_readl(FUSE_UID_LOW);
54 hi = tegra_fuse_readl(FUSE_UID_HIGH);
55 return (hi << 32ull) | lo;
58 int tegra_sku_id(void)
61 u32 reg = tegra_fuse_readl(FUSE_SKU_INFO);
66 int tegra_cpu_process_id(void)
69 u32 reg = tegra_fuse_readl(FUSE_SPARE_BIT);
70 cpu_process_id = (reg >> 6) & 3;
71 return cpu_process_id;
74 int tegra_core_process_id(void)
77 u32 reg = tegra_fuse_readl(FUSE_SPARE_BIT);
78 core_process_id = (reg >> 12) & 3;
79 return core_process_id;