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>
22 #include <linux/module.h>
24 #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 fuse_readl(unsigned long offset)
35 return readl(IO_TO_VIRT(TEGRA_FUSE_BASE + offset));
38 static inline void fuse_writel(u32 value, unsigned long offset)
40 writel(value, IO_TO_VIRT(TEGRA_FUSE_BASE + offset));
43 void tegra_init_fuse(void)
45 u32 reg = readl(IO_TO_VIRT(TEGRA_CLK_RESET_BASE + 0x48));
47 writel(reg, IO_TO_VIRT(TEGRA_CLK_RESET_BASE + 0x48));
49 pr_info("Tegra SKU: %d CPU Process: %d Core Process: %d\n",
50 tegra_sku_id(), tegra_cpu_process_id(),
51 tegra_core_process_id());
54 unsigned long long tegra_chip_uid(void)
56 unsigned long long lo, hi;
58 lo = fuse_readl(FUSE_UID_LOW);
59 hi = fuse_readl(FUSE_UID_HIGH);
60 return (hi << 32ull) | lo;
62 EXPORT_SYMBOL(tegra_chip_uid);
64 int tegra_sku_id(void)
67 u32 reg = fuse_readl(FUSE_SKU_INFO);
72 int tegra_cpu_process_id(void)
75 u32 reg = fuse_readl(FUSE_SPARE_BIT);
76 cpu_process_id = (reg >> 6) & 3;
77 return cpu_process_id;
80 int tegra_core_process_id(void)
83 u32 reg = fuse_readl(FUSE_SPARE_BIT);
84 core_process_id = (reg >> 12) & 3;
85 return core_process_id;