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> Signed-off-by: Tom Warren <twarren@nvidia.com>master
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/*
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* Copyright (c) 2011 The Chromium OS Authors. |
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* (C) Copyright 2010,2011 NVIDIA Corporation <www.nvidia.com> |
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* |
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* See file CREDITS for list of people who contributed to this |
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* project. |
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License as |
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* published by the Free Software Foundation; either version 2 of |
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* the License, or (at your option) any later version. |
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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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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
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* MA 02111-1307 USA |
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*/ |
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#include <common.h> |
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#include <tps6586x.h> |
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#include <asm/io.h> |
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#include <asm/arch/ap20.h> |
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#include <asm/arch/tegra2.h> |
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#include <asm/arch/tegra_i2c.h> |
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#include <asm/arch/sys_proto.h> |
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#define VDD_CORE_NOMINAL_T25 0x17 /* 1.3v */ |
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#define VDD_CPU_NOMINAL_T25 0x10 /* 1.125v */ |
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#define VDD_CORE_NOMINAL_T20 0x16 /* 1.275v */ |
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#define VDD_CPU_NOMINAL_T20 0x0f /* 1.1v */ |
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#define VDD_RELATION 0x02 /* 50mv */ |
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#define VDD_TRANSITION_STEP 0x06 /* 150mv */ |
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#define VDD_TRANSITION_RATE 0x06 /* 3.52mv/us */ |
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int pmu_set_nominal(void) |
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{ |
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int core, cpu, bus; |
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/* by default, the table has been filled with T25 settings */ |
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switch (tegra_get_chip_type()) { |
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case TEGRA_SOC_T20: |
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core = VDD_CORE_NOMINAL_T20; |
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cpu = VDD_CPU_NOMINAL_T20; |
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break; |
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case TEGRA_SOC_T25: |
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core = VDD_CORE_NOMINAL_T25; |
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cpu = VDD_CPU_NOMINAL_T25; |
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break; |
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default: |
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debug("%s: Unknown chip type\n", __func__); |
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return -1; |
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} |
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bus = tegra_i2c_get_dvc_bus_num(); |
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if (bus == -1) { |
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debug("%s: Cannot find DVC I2C bus\n", __func__); |
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return -1; |
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} |
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tps6586x_init(bus); |
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tps6586x_set_pwm_mode(TPS6586X_PWM_SM1); |
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return tps6586x_adjust_sm0_sm1(core, cpu, VDD_TRANSITION_STEP, |
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VDD_TRANSITION_RATE, VDD_RELATION); |
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} |
@ -0,0 +1,30 @@ |
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/*
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* (C) Copyright 2010,2011 |
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* NVIDIA Corporation <www.nvidia.com> |
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* |
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* See file CREDITS for list of people who contributed to this |
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* project. |
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License as |
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* published by the Free Software Foundation; either version 2 of |
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* the License, or (at your option) any later version. |
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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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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
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* MA 02111-1307 USA |
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*/ |
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#ifndef _ARCH_PMU_H_ |
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#define _ARCH_PMU_H_ |
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/* Set core and CPU voltages to nominal levels */ |
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int pmu_set_nominal(void); |
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#endif /* _ARCH_PMU_H_ */ |
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