73625e3e2e
The Tegra SOC contains fuses to identify the CPU type and bin, and a unique id. The CPU info is required to determine the correct voltages for each cpu and core frequency. Signed-off-by: Colin Cross <ccross@android.com>
85 lines
1.9 KiB
C
85 lines
1.9 KiB
C
/*
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* arch/arm/mach-tegra/fuse.c
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*
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* Copyright (C) 2010 Google, Inc.
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*
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* Author:
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* Colin Cross <ccross@android.com>
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/io.h>
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#include <mach/iomap.h>
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#include "fuse.h"
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#define FUSE_UID_LOW 0x108
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#define FUSE_UID_HIGH 0x10c
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#define FUSE_SKU_INFO 0x110
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#define FUSE_SPARE_BIT 0x200
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static inline u32 fuse_readl(unsigned long offset)
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{
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return readl(IO_TO_VIRT(TEGRA_FUSE_BASE + offset));
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}
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static inline void fuse_writel(u32 value, unsigned long offset)
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{
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writel(value, IO_TO_VIRT(TEGRA_FUSE_BASE + offset));
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}
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void tegra_init_fuse(void)
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{
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u32 reg = readl(IO_TO_VIRT(TEGRA_CLK_RESET_BASE + 0x48));
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reg |= 1 << 28;
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writel(reg, IO_TO_VIRT(TEGRA_CLK_RESET_BASE + 0x48));
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pr_info("Tegra SKU: %d CPU Process: %d Core Process: %d\n",
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tegra_sku_id(), tegra_cpu_process_id(),
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tegra_core_process_id());
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}
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unsigned long long tegra_chip_uid(void)
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{
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unsigned long long lo, hi;
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lo = fuse_readl(FUSE_UID_LOW);
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hi = fuse_readl(FUSE_UID_HIGH);
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return (hi << 32ull) | lo;
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}
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int tegra_sku_id(void)
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{
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int sku_id;
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u32 reg = fuse_readl(FUSE_SKU_INFO);
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sku_id = reg & 0xFF;
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return sku_id;
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}
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int tegra_cpu_process_id(void)
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{
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int cpu_process_id;
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u32 reg = fuse_readl(FUSE_SPARE_BIT);
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cpu_process_id = (reg >> 6) & 3;
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return cpu_process_id;
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}
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int tegra_core_process_id(void)
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{
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int core_process_id;
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u32 reg = fuse_readl(FUSE_SPARE_BIT);
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core_process_id = (reg >> 12) & 3;
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return core_process_id;
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}
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