LXR linux/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
  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}
  85