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fuse.c

/*
 * arch/arm/mach-tegra/fuse.c
 *
 * Copyright (C) 2010 Google, Inc.
 *
 * Author:
 *    Colin Cross <ccross@android.com>
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */

#include <linux/kernel.h>
#include <linux/io.h>

#include <mach/iomap.h>

#include "fuse.h"

#define FUSE_UID_LOW          0x108
#define FUSE_UID_HIGH         0x10c
#define FUSE_SKU_INFO         0x110
#define FUSE_SPARE_BIT        0x200

static inline u32 fuse_readl(unsigned long offset)
{
      return readl(IO_TO_VIRT(TEGRA_FUSE_BASE + offset));
}

static inline void fuse_writel(u32 value, unsigned long offset)
{
      writel(value, IO_TO_VIRT(TEGRA_FUSE_BASE + offset));
}

void tegra_init_fuse(void)
{
      u32 reg = readl(IO_TO_VIRT(TEGRA_CLK_RESET_BASE + 0x48));
      reg |= 1 << 28;
      writel(reg, IO_TO_VIRT(TEGRA_CLK_RESET_BASE + 0x48));

      pr_info("Tegra SKU: %d CPU Process: %d Core Process: %d\n",
            tegra_sku_id(), tegra_cpu_process_id(),
            tegra_core_process_id());
}

unsigned long long tegra_chip_uid(void)
{
      unsigned long long lo, hi;

      lo = fuse_readl(FUSE_UID_LOW);
      hi = fuse_readl(FUSE_UID_HIGH);
      return (hi << 32ull) | lo;
}

int tegra_sku_id(void)
{
      int sku_id;
      u32 reg = fuse_readl(FUSE_SKU_INFO);
      sku_id = reg & 0xFF;
      return sku_id;
}

int tegra_cpu_process_id(void)
{
      int cpu_process_id;
      u32 reg = fuse_readl(FUSE_SPARE_BIT);
      cpu_process_id = (reg >> 6) & 3;
      return cpu_process_id;
}

int tegra_core_process_id(void)
{
      int core_process_id;
      u32 reg = fuse_readl(FUSE_SPARE_BIT);
      core_process_id = (reg >> 12) & 3;
      return core_process_id;
}

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