diff options
Diffstat (limited to 'qemu/roms/u-boot/drivers/power/tps6586x.c')
| -rw-r--r-- | qemu/roms/u-boot/drivers/power/tps6586x.c | 264 |
1 files changed, 0 insertions, 264 deletions
diff --git a/qemu/roms/u-boot/drivers/power/tps6586x.c b/qemu/roms/u-boot/drivers/power/tps6586x.c deleted file mode 100644 index d29d96953..000000000 --- a/qemu/roms/u-boot/drivers/power/tps6586x.c +++ /dev/null @@ -1,264 +0,0 @@ -/* - * 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 <tps6586x.h> -#include <asm/io.h> -#include <i2c.h> - -static int bus_num; /* I2C bus we are on */ -#define I2C_ADDRESS 0x34 /* chip requires this address */ -static char inited; /* 1 if we have been inited */ - -enum { - /* Registers that we access */ - SUPPLY_CONTROL1 = 0x20, - SUPPLY_CONTROL2, - SM1_VOLTAGE_V1 = 0x23, - SM1_VOLTAGE_V2, - SM0_VOLTAGE_V1 = 0x26, - SM0_VOLTAGE_V2, - PFM_MODE = 0x47, - - /* Bits in the supply control registers */ - CTRL_SM1_RAMP = 0x01, - CTRL_SM1_SUPPLY2 = 0x02, - CTRL_SM0_RAMP = 0x04, - CTRL_SM0_SUPPLY2 = 0x08, -}; - -#define MAX_I2C_RETRY 3 -static int tps6586x_read(int reg) -{ - int i; - uchar data; - int retval = -1; - int old_bus_num; - - old_bus_num = i2c_get_bus_num(); - i2c_set_bus_num(bus_num); - - for (i = 0; i < MAX_I2C_RETRY; ++i) { - if (!i2c_read(I2C_ADDRESS, reg, 1, &data, 1)) { - retval = (int)data; - goto exit; - } - - /* i2c access failed, retry */ - udelay(100); - } - -exit: - i2c_set_bus_num(old_bus_num); - debug("pmu_read %x=%x\n", reg, retval); - if (retval < 0) - debug("%s: failed to read register %#x: %d\n", __func__, reg, - retval); - return retval; -} - -static int tps6586x_write(int reg, uchar *data, uint len) -{ - int i; - int retval = -1; - int old_bus_num; - - old_bus_num = i2c_get_bus_num(); - i2c_set_bus_num(bus_num); - - for (i = 0; i < MAX_I2C_RETRY; ++i) { - if (!i2c_write(I2C_ADDRESS, reg, 1, data, len)) { - retval = 0; - goto exit; - } - - /* i2c access failed, retry */ - udelay(100); - } - -exit: - i2c_set_bus_num(old_bus_num); - debug("pmu_write %x=%x: ", reg, retval); - for (i = 0; i < len; i++) - debug("%x ", data[i]); - if (retval) - debug("%s: failed to write register %#x\n", __func__, reg); - return retval; -} - -/* - * Get current voltage of SM0 and SM1 - * - * @param sm0 Place to put SM0 voltage - * @param sm1 Place to put SM1 voltage - * @return 0 if ok, -1 on error - */ -static int read_voltages(int *sm0, int *sm1) -{ - int ctrl1, ctrl2; - int is_v2; - - /* - * Each vdd has two supply sources, ie, v1 and v2. - * The supply control reg1 and reg2 determine the current selection. - */ - ctrl1 = tps6586x_read(SUPPLY_CONTROL1); - ctrl2 = tps6586x_read(SUPPLY_CONTROL2); - if (ctrl1 == -1 || ctrl2 == -1) - return -1; - - /* Figure out whether V1 or V2 is selected */ - is_v2 = (ctrl1 | ctrl2) & CTRL_SM0_SUPPLY2; - *sm0 = tps6586x_read(is_v2 ? SM0_VOLTAGE_V2 : SM0_VOLTAGE_V1); - *sm1 = tps6586x_read(is_v2 ? SM1_VOLTAGE_V2 : SM1_VOLTAGE_V1); - if (*sm0 == -1 || *sm1 == -1) - return -1; - - return 0; -} - -static int set_voltage(int reg, int data, int rate) -{ - uchar control_bit; - uchar buff[3]; - - control_bit = (reg == SM0_VOLTAGE_V1 ? CTRL_SM0_RAMP : CTRL_SM1_RAMP); - - /* - * Only one supply is needed in u-boot. set both v1 and v2 to - * same value. - * - * When both v1 and v2 are set to same value, we just need to set - * control1 reg to trigger the supply selection. - */ - buff[0] = buff[1] = (uchar)data; - buff[2] = rate; - - /* write v1, v2 and rate, then trigger */ - if (tps6586x_write(reg, buff, 3) || - tps6586x_write(SUPPLY_CONTROL1, &control_bit, 1)) - return -1; - - return 0; -} - -static int calculate_next_voltage(int voltage, int target, int step) -{ - int diff = voltage < target ? step : -step; - - if (abs(target - voltage) > step) - voltage += diff; - else - voltage = target; - - return voltage; -} - -int tps6586x_set_pwm_mode(int mask) -{ - uchar val; - int ret; - - assert(inited); - ret = tps6586x_read(PFM_MODE); - if (ret != -1) { - val = (uchar)ret; - val |= mask; - - ret = tps6586x_write(PFM_MODE, &val, 1); - } - - if (ret == -1) - debug("%s: Failed to read/write PWM mode reg\n", __func__); - - return ret; -} - -int tps6586x_adjust_sm0_sm1(int sm0_target, int sm1_target, int step, int rate, - int min_sm0_over_sm1) -{ - int sm0, sm1; - int bad; - - assert(inited); - - /* get current voltage settings */ - if (read_voltages(&sm0, &sm1)) { - debug("%s: Cannot read voltage settings\n", __func__); - return -1; - } - - /* - * if vdd_core < vdd_cpu + rel - * skip - * - * This condition may happen when system reboots due to kernel crash. - */ - if (min_sm0_over_sm1 != -1 && sm0 < sm1 + min_sm0_over_sm1) { - debug("%s: SM0 is %d, SM1 is %d, but min_sm0_over_sm1 is %d\n", - __func__, sm0, sm1, min_sm0_over_sm1); - return -1; - } - - /* - * Since vdd_core and vdd_cpu may both stand at either greater or less - * than their nominal voltage, the adjustment may go either directions. - * - * Make sure vdd_core is always higher than vdd_cpu with certain margin. - * So, find out which vdd to adjust first in each step. - * - * case 1: both sm0 and sm1 need to move up - * adjust sm0 before sm1 - * - * case 2: both sm0 and sm1 need to move down - * adjust sm1 before sm0 - * - * case 3: sm0 moves down and sm1 moves up - * adjusting either one first is fine. - * - * Adjust vdd_core and vdd_cpu one step at a time until they reach - * their nominal values. - */ - bad = 0; - while (!bad && (sm0 != sm0_target || sm1 != sm1_target)) { - int adjust_sm0_late = 0; /* flag to adjust vdd_core later */ - - debug("%d-%d %d-%d ", sm0, sm0_target, sm1, sm1_target); - - if (sm0 != sm0_target) { - /* - * if case 1 and case 3, set new sm0 first. - * otherwise, hold down until new sm1 is set. - */ - sm0 = calculate_next_voltage(sm0, sm0_target, step); - if (sm1 < sm1_target) - bad |= set_voltage(SM0_VOLTAGE_V1, sm0, rate); - else - adjust_sm0_late = 1; - } - - if (sm1 != sm1_target) { - sm1 = calculate_next_voltage(sm1, sm1_target, step); - bad |= set_voltage(SM1_VOLTAGE_V1, sm1, rate); - } - - if (adjust_sm0_late) - bad |= set_voltage(SM0_VOLTAGE_V1, sm0, rate); - debug("%d\n", adjust_sm0_late); - } - debug("%d-%d %d-%d done\n", sm0, sm0_target, sm1, sm1_target); - - return bad ? -1 : 0; -} - -int tps6586x_init(int bus) -{ - bus_num = bus; - inited = 1; - - return 0; -} |