From: Jimmy Zhang jimmzhang@nvidia.com
Power supplies must be adjusted in line with clock frequency. This code provides a simple routine to set the voltage to allow operation at maximum frequency.
- Split PMU code into separate TPS6586X driver
Signed-off-by: Simon Glass sjg@chromium.org ---
arch/arm/cpu/armv7/tegra2/Makefile | 1 + arch/arm/cpu/armv7/tegra2/pmu.c | 70 ++++++++++++++++++++++++++++++++ arch/arm/include/asm/arch-tegra2/pmu.h | 30 ++++++++++++++ 3 files changed, 101 insertions(+), 0 deletions(-) create mode 100644 arch/arm/cpu/armv7/tegra2/pmu.c create mode 100644 arch/arm/include/asm/arch-tegra2/pmu.h
diff --git a/arch/arm/cpu/armv7/tegra2/Makefile b/arch/arm/cpu/armv7/tegra2/Makefile index dcd6329..dba684d 100644 --- a/arch/arm/cpu/armv7/tegra2/Makefile +++ b/arch/arm/cpu/armv7/tegra2/Makefile @@ -35,6 +35,7 @@ LIB = $(obj)lib$(SOC).o SOBJS := lowlevel_init.o COBJS-y := ap20.o board.o clock.o funcmux.o pinmux.o sys_info.o timer.o COBJS-$(CONFIG_TEGRA_CLOCK_SCALING) += emc.o +COBJS-$(CONFIG_TEGRA_PMU) += pmu.o COBJS-$(CONFIG_USB_EHCI_TEGRA) += usb.o
COBJS := $(COBJS-y) diff --git a/arch/arm/cpu/armv7/tegra2/pmu.c b/arch/arm/cpu/armv7/tegra2/pmu.c new file mode 100644 index 0000000..4673802 --- /dev/null +++ b/arch/arm/cpu/armv7/tegra2/pmu.c @@ -0,0 +1,70 @@ +/* + * Copyright (c) 2011 The Chromium OS Authors. + * (C) Copyright 2010,2011 NVIDIA Corporation <www.nvidia.com> + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include <common.h> +#include <tps6586x.h> +#include <asm/io.h> +#include <asm/arch/ap20.h> +#include <asm/arch/tegra2.h> +#include <asm/arch/tegra_i2c.h> +#include <asm/arch/sys_proto.h> + +#define VDD_CORE_NOMINAL_T25 0x17 /* 1.3v */ +#define VDD_CPU_NOMINAL_T25 0x10 /* 1.125v */ + +#define VDD_CORE_NOMINAL_T20 0x16 /* 1.275v */ +#define VDD_CPU_NOMINAL_T20 0x0f /* 1.1v */ + +#define VDD_RELATION 0x02 /* 50mv */ +#define VDD_TRANSITION_STEP 0x06 /* 150mv */ +#define VDD_TRANSITION_RATE 0x06 /* 3.52mv/us */ + +int pmu_set_nominal(void) +{ + int core, cpu, bus; + + /* by default, the table has been filled with T25 settings */ + switch (tegra_get_chip_type()) { + case TEGRA_SOC_T20: + core = VDD_CORE_NOMINAL_T20; + cpu = VDD_CPU_NOMINAL_T20; + break; + case TEGRA_SOC_T25: + core = VDD_CORE_NOMINAL_T25; + cpu = VDD_CPU_NOMINAL_T25; + break; + default: + debug("%s: Unknown chip type\n", __func__); + return -1; + } + + bus = tegra_i2c_get_dvc_bus_num(); + if (bus == -1) { + debug("%s: Cannot find DVC I2C bus\n", __func__); + return -1; + } + tps6586x_init(bus); + tps6586x_set_pwm_mode(TPS6586X_PWM_SM1); + return tps6586x_adjust_sm0_sm1(core, cpu, VDD_TRANSITION_STEP, + VDD_TRANSITION_RATE, VDD_RELATION); +} diff --git a/arch/arm/include/asm/arch-tegra2/pmu.h b/arch/arm/include/asm/arch-tegra2/pmu.h new file mode 100644 index 0000000..390815f --- /dev/null +++ b/arch/arm/include/asm/arch-tegra2/pmu.h @@ -0,0 +1,30 @@ +/* + * (C) Copyright 2010,2011 + * NVIDIA Corporation <www.nvidia.com> + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#ifndef _ARCH_PMU_H_ +#define _ARCH_PMU_H_ + +/* Set core and CPU voltages to nominal levels */ +int pmu_set_nominal(void); + +#endif /* _ARCH_PMU_H_ */