c043ecf9e1
The current code does hazardous tweaks to the power subsystem: indeed if one boots with USB plugged and some stub powers on the DCDC switch, it will fail. Indeed, a hardware bug prevents from going back to linear regulators (see errata) so we cannot expect to reach a known state (linreg on, dcdc off) on each configuration and in particular, powering down the 4p2 rail in such a configuration will result in a power brownout. This commit works around this issue by not touching the initial power configuration until USB is (un)plugged, which are the best spots to get known states. Change-Id: I8741a3995df8ae61ca1c887a3ecb7903d0ac5136
197 lines
7.3 KiB
C
197 lines
7.3 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2011 by Amaury Pouly
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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
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "system.h"
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#include "powermgmt.h"
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#include "power-imx233.h"
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#include "usb.h"
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#include "string.h"
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//#define LOGF_ENABLE
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#include "logf.h"
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#include "powermgmt-imx233.h"
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#if !defined(IMX233_CHARGE_CURRENT) || !defined(IMX233_STOP_CURRENT) \
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|| !defined(IMX233_CHARGING_TIMEOUT) || !defined(IMX233_TOPOFF_TIMEOUT)
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#error You must define IMX233_CHARGE_CURRENT, IMX233_STOP_CURRENT, \
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IMX233_CHARGING_TIMEOUT and IMX233_TOPOFF_TIMEOUT !
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#endif
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/* charger state is maintained in charge_state (see powermgmt.h) */
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static int timeout_charging; /* timeout before charging will be declared broken */
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static int timeout_topping_off; /* timeout before stopping charging after topping off */
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static int timeout_4p2_ilimit_increase; /* timeout before increasing 4p2 ilimit */
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/* Returns battery voltage from ADC [millivolts] */
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int _battery_voltage(void)
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{
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/* battery value is in 8mV LSB */
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return BF_RD(POWER_BATTMONITOR, BATT_VAL) * 8;
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}
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void imx233_powermgmt_init(void)
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{
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imx233_power_set_charge_current(IMX233_CHARGE_CURRENT);
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imx233_power_set_stop_current(IMX233_STOP_CURRENT);
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#if IMX233_SUBTARGET >= 3700
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/* assume that adc_init was called and battery monitoring via LRADC setup */
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BF_WR(POWER_BATTMONITOR, EN_BATADJ, 1);
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/* setup linear regulator offsets to 25 mV below to prevent contention between
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* linear regulators and DCDC */
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BF_WR(POWER_VDDDCTRL, LINREG_OFFSET, 2);
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BF_WR(POWER_VDDACTRL, LINREG_OFFSET, 2);
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BF_WR(POWER_VDDIOCTRL, LINREG_OFFSET, 2);
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/* enable a few bits controlling the DC-DC as recommended by Freescale */
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BF_SET(POWER_LOOPCTRL, TOGGLE_DIF);
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BF_SET(POWER_LOOPCTRL, EN_CM_HYST);
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BF_CLR(POWER_LOOPCTRL, EN_RCSCALE);
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BF_SETV(POWER_LOOPCTRL, EN_RCSCALE, 1);
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#else
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BF_SET(POWER_5VCTRL, LINREG_OFFSET);
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#endif
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}
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void powermgmt_init_target(void)
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{
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charge_state = DISCHARGING;
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}
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void charging_algorithm_step(void)
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{
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#if IMX233_SUBTARGET >= 3700
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bool is_5v_present = usb_detect() == USB_INSERTED;
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/* initial state & 5v -> battery transition */
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if(!is_5v_present && charge_state != DISCHARGING)
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{
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logf("pwrmgmt: * -> discharging");
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logf("pwrmgmt: disable charger and 4p2");
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/* 5V has been lost: disable 4p2 power rail */
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BF_SET(POWER_CHARGE, PWD_BATTCHRG);
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#if IMX233_SUBTARGET >= 3780
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BF_WR(POWER_DCDC4P2, ENABLE_DCDC, 0);
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BF_WR(POWER_DCDC4P2, ENABLE_4P2, 0);
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BF_WR(POWER_5VCTRL, CHARGE_4P2_ILIMIT, 1);
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BF_SET(POWER_5VCTRL, PWD_CHARGE_4P2);
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#endif
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charge_state = DISCHARGING;
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}
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/* battery -> 5v transition */
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else if(is_5v_present && charge_state == DISCHARGING)
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{
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logf("pwrmgmt: discharging -> trickle");
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logf("pwrmgmt: begin charging 4p2");
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#if IMX233_SUBTARGET >= 3780
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/* 5V has been detected: prepare 4.2V power rail for activation
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* WARNING we can reach this situation when starting after Freescale bootloader
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* or after RoLo in a state where the DCDC is running. In this case,
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* we must *NOT* disable it or this will shutdown the device. This procedure
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* is safe: it will never disable the DCDC and will not reduce the charge
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* limit on the 4P2 rail. */
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BF_WR(POWER_DCDC4P2, ENABLE_4P2, 1);
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BF_SET(POWER_CHARGE, ENABLE_LOAD);
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BF_CLR(POWER_5VCTRL, PWD_CHARGE_4P2);// FIXME: manual error ?
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BF_WR(POWER_DCDC4P2, ENABLE_DCDC, 1);
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#endif
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timeout_4p2_ilimit_increase = current_tick + HZ / 100;
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charge_state = TRICKLE;
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}
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else if(charge_state == TRICKLE && TIME_AFTER(current_tick, timeout_4p2_ilimit_increase))
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{
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#if IMX233_SUBTARGET >= 3780
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/* if 4.2V current limit has not reached 780mA, increase it slowly to
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* charge the 4.2V capacitance */
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if(BF_RD(POWER_5VCTRL, CHARGE_4P2_ILIMIT) != 0x3f)
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{
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//logf("pwrmgmt: incr 4.2 ilimit");
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HW_POWER_5VCTRL += BF_POWER_5VCTRL_CHARGE_4P2_ILIMIT(1);
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timeout_4p2_ilimit_increase = current_tick + HZ / 100;
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}
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/* we've reached the maximum, take action */
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else
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#endif
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{
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logf("pwrmgmt: enable dcdc and charger");
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logf("pwrmgmt: trickle -> charging");
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#if IMX233_SUBTARGET >= 3780
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/* adjust arbitration between 4.2 and battery */
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BF_WR(POWER_DCDC4P2, CMPTRIP, 0); /* 85% */
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BF_WR(POWER_DCDC4P2, DROPOUT_CTRL, 0xe); /* select greater, 200 mV drop */
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#endif
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/* switch to DCDC */
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BF_CLR(POWER_5VCTRL, DCDC_XFER);
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BF_SET(POWER_5VCTRL, ENABLE_DCDC);
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/* enable battery charging */
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BF_CLR(POWER_CHARGE, PWD_BATTCHRG);
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charge_state = CHARGING;
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timeout_charging = current_tick + IMX233_CHARGING_TIMEOUT;
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}
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}
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else if(charge_state == CHARGING && TIME_AFTER(current_tick, timeout_charging))
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{
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/* we have charged for a too long time, declare charger broken */
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logf("pwrmgmt: charging timeout exceeded!");
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logf("pwrmgmt: charging -> error");
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/* stop charging */
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#if IMX233_SUBTARGET >= 3780
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BF_SET(POWER_5VCTRL, PWD_CHARGE_4P2);
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#endif
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BF_SET(POWER_CHARGE, PWD_BATTCHRG);
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/* goto error state */
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charge_state = CHARGE_STATE_ERROR;
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}
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else if(charge_state == CHARGING && !BF_RD(POWER_STS, CHRGSTS))
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{
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logf("pwrmgmt: topping off");
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logf("pwrmgmt: charging -> topoff");
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charge_state = TOPOFF;
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timeout_topping_off = current_tick + IMX233_TOPOFF_TIMEOUT;
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}
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else if(charge_state == TOPOFF && TIME_AFTER(current_tick, timeout_topping_off))
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{
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logf("pwrmgmt: charging finished");
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logf("pwrmgmt: topoff -> disabled");
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/* stop charging */
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#if IMX233_SUBTARGET >= 3780
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BF_SET(POWER_5VCTRL, PWD_CHARGE_4P2);
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#endif
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BF_SET(POWER_CHARGE, PWD_BATTCHRG);
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charge_state = CHARGE_STATE_DISABLED;
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}
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#endif
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}
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void charging_algorithm_close(void)
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{
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}
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struct imx233_powermgmt_info_t imx233_powermgmt_get_info(void)
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{
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struct imx233_powermgmt_info_t info;
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memset(&info, 0, sizeof(info));
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info.state = charge_state;
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info.charging_timeout =
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charge_state == CHARGING ? timeout_charging - current_tick : 0;
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info.topoff_timeout =
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charge_state == TOPOFF ? timeout_topping_off - current_tick : 0;
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info.incr_4p2_ilimit_timeout =
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charge_state == TRICKLE ? timeout_4p2_ilimit_increase - current_tick : 0;
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return info;
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}
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