u-boot/arch/arm/mach-tegra/tegra20/pmu.c

/*
 * Copyright (c) 2011 The Chromium OS Authors.
 * (C) Copyright 2010,2011 NVIDIA Corporation <www.nvidia.com>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <i2c.h>
#include <tps6586x.h>
#include <asm/io.h>
#include <asm/arch/tegra.h>
#include <asm/arch-tegra/ap.h>
#include <asm/arch-tegra/tegra_i2c.h>
#include <asm/arch-tegra/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 */

#define PMI_I2C_ADDRESS	0x34	/* chip requires this address */

int pmu_set_nominal(void)
{
	struct udevice *bus, *dev;
	int core, cpu;
	int ret;

	/* by default, the table has been filled with T25 settings */
	switch (tegra_get_chip_sku()) {
	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 SKU id\n", __func__);
		return -1;
	}

	ret = tegra_i2c_get_dvc_bus(&bus);
	if (ret) {
		debug("%s: Cannot find DVC I2C bus\n", __func__);
		return ret;
	}
	ret = i2c_get_chip(bus, PMI_I2C_ADDRESS, 1, &dev);
	if (ret) {
		debug("%s: Cannot find DVC I2C chip\n", __func__);
		return ret;
	}

	tps6586x_init(dev);
	tps6586x_set_pwm_mode(TPS6586X_PWM_SM1);
	return tps6586x_adjust_sm0_sm1(core, cpu, VDD_TRANSITION_STEP,
				VDD_TRANSITION_RATE, VDD_RELATION);
}