arch/arm/mach-tegra/fuse.c

   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 }