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Commit 73625e3e authored by Colin Cross's avatar Colin Cross
Browse files

[ARM] tegra: Add support for reading fuses 



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: default avatarColin Cross <ccross@android.com>
parent 2e47b8b3

arch/arm/mach-tegra/Makefile

+1 −0
Original line number Original line Diff line number Diff line
@@ -5,6 +5,7 @@ obj-y += clock.o 
obj-y                                   += timer.o

obj-y                                   += timer.o

obj-y                                   += gpio.o

obj-y                                   += gpio.o

obj-y                                   += pinmux.o

obj-y                                   += pinmux.o

obj-y					+= fuse.o

obj-$(CONFIG_ARCH_TEGRA_2x_SOC)         += clock.o

obj-$(CONFIG_ARCH_TEGRA_2x_SOC)         += clock.o

obj-$(CONFIG_ARCH_TEGRA_2x_SOC)         += tegra2_clocks.o

obj-$(CONFIG_ARCH_TEGRA_2x_SOC)         += tegra2_clocks.o

obj-$(CONFIG_ARCH_TEGRA_2x_SOC)		+= pinmux-t2-tables.o

obj-$(CONFIG_ARCH_TEGRA_2x_SOC)		+= pinmux-t2-tables.o

arch/arm/mach-tegra/common.c

+2 −0
Original line number Original line Diff line number Diff line
@@ -26,6 +26,7 @@ 




#include "board.h"

#include "board.h"

#include "clock.h"

#include "clock.h"

#include "fuse.h"





static __initdata struct tegra_clk_init_table common_clk_init_table[] = {

static __initdata struct tegra_clk_init_table common_clk_init_table[] = {

	/* name		parent		rate		enabled */

	/* name		parent		rate		enabled */
@@ -55,6 +56,7 @@ void __init tegra_init_cache(void) 




void __init tegra_common_init(void)

void __init tegra_common_init(void)

{

{

	tegra_init_fuse();

	tegra_init_clock();

	tegra_init_clock();

	tegra_clk_init_from_table(common_clk_init_table);

	tegra_clk_init_from_table(common_clk_init_table);

	tegra_init_cache();

	tegra_init_cache();

arch/arm/mach-tegra/fuse.c

0 → 100644
+84 −0
Original line number Original line Diff line number Diff line 
/*

 * 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;

}

arch/arm/mach-tegra/fuse.h

0 → 100644
+24 −0
Original line number Original line Diff line number Diff line 
/*

 * 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.

 *

 */



unsigned long long tegra_chip_uid(void);

int tegra_sku_id(void);

int tegra_cpu_process_id(void);

int tegra_core_process_id(void);

void tegra_init_fuse(void);