diff options
Diffstat (limited to 'arch/arm/mach-tegra/fuse.c')
-rw-r--r-- | arch/arm/mach-tegra/fuse.c | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/arch/arm/mach-tegra/fuse.c b/arch/arm/mach-tegra/fuse.c new file mode 100644 index 000000000000..1fa26d9a1a68 --- /dev/null +++ b/arch/arm/mach-tegra/fuse.c | |||
@@ -0,0 +1,84 @@ | |||
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 | |||
32 | static inline u32 fuse_readl(unsigned long offset) | ||
33 | { | ||
34 | return readl(IO_TO_VIRT(TEGRA_FUSE_BASE + offset)); | ||
35 | } | ||
36 | |||
37 | static inline void fuse_writel(u32 value, unsigned long offset) | ||
38 | { | ||
39 | writel(value, IO_TO_VIRT(TEGRA_FUSE_BASE + offset)); | ||
40 | } | ||
41 | |||
42 | void 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 | |||
53 | unsigned 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 | |||
62 | int 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 | |||
70 | int 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 | |||
78 | int 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 | } | ||