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![Michael Heimpold](/assets/img/avatar_default.png)
For some board designs, it might be useful to switch the DC-DC clock source to something else rather the default 24 MHz, e.g. for EMI reasons. For this, override the mxs_power_setup_dcdc_clocksource function in your board support files. Example: void mxs_power_setup_dcdc_clocksource(void) { mxs_power_switch_dcdc_clocksource(POWER_MISC_FREQSEL_20MHZ); } Signed-off-by: Michael Heimpold <mhei@heimpold.de> Cc: Marek Vasut <marex@denx.de> Cc: Otavio Salvador <otavio@ossystems.com.br> Cc: Fabio Estevam <fabio.estevam@freescale.com> Acked-by: Marek Vasut <marex@denx.de>
1291 lines
37 KiB
C
1291 lines
37 KiB
C
/*
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* Freescale i.MX28 Boot PMIC init
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*
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* Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
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* on behalf of DENX Software Engineering GmbH
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <config.h>
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#include <asm/io.h>
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#include <asm/arch/imx-regs.h>
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#include "mxs_init.h"
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#ifdef CONFIG_SYS_MXS_VDD5V_ONLY
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#define DCDC4P2_DROPOUT_CONFIG POWER_DCDC4P2_DROPOUT_CTRL_100MV | \
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POWER_DCDC4P2_DROPOUT_CTRL_SRC_4P2
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#else
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#define DCDC4P2_DROPOUT_CONFIG POWER_DCDC4P2_DROPOUT_CTRL_100MV | \
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POWER_DCDC4P2_DROPOUT_CTRL_SRC_SEL
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#endif
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/**
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* mxs_power_clock2xtal() - Switch CPU core clock source to 24MHz XTAL
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*
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* This function switches the CPU core clock from PLL to 24MHz XTAL
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* oscilator. This is necessary if the PLL is being reconfigured to
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* prevent crash of the CPU core.
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*/
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static void mxs_power_clock2xtal(void)
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{
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struct mxs_clkctrl_regs *clkctrl_regs =
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(struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE;
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debug("SPL: Switching CPU clock to 24MHz XTAL\n");
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/* Set XTAL as CPU reference clock */
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writel(CLKCTRL_CLKSEQ_BYPASS_CPU,
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&clkctrl_regs->hw_clkctrl_clkseq_set);
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}
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/**
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* mxs_power_clock2pll() - Switch CPU core clock source to PLL
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*
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* This function switches the CPU core clock from 24MHz XTAL oscilator
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* to PLL. This can only be called once the PLL has re-locked and once
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* the PLL is stable after reconfiguration.
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*/
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static void mxs_power_clock2pll(void)
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{
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struct mxs_clkctrl_regs *clkctrl_regs =
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(struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE;
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debug("SPL: Switching CPU core clock source to PLL\n");
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/*
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* TODO: Are we really? It looks like we turn on PLL0, but we then
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* set the CLKCTRL_CLKSEQ_BYPASS_CPU bit of the (which was already
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* set by mxs_power_clock2xtal()). Clearing this bit here seems to
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* introduce some instability (causing the CPU core to hang). Maybe
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* we aren't giving PLL0 enough time to stabilise?
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*/
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setbits_le32(&clkctrl_regs->hw_clkctrl_pll0ctrl0,
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CLKCTRL_PLL0CTRL0_POWER);
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early_delay(100);
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/*
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* TODO: Should the PLL0 FORCE_LOCK bit be set here followed be a
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* wait on the PLL0 LOCK bit?
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*/
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setbits_le32(&clkctrl_regs->hw_clkctrl_clkseq,
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CLKCTRL_CLKSEQ_BYPASS_CPU);
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}
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/**
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* mxs_power_set_auto_restart() - Set the auto-restart bit
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*
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* This function ungates the RTC block and sets the AUTO_RESTART
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* bit to work around a design bug on MX28EVK Rev. A .
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*/
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static void mxs_power_set_auto_restart(void)
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{
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struct mxs_rtc_regs *rtc_regs =
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(struct mxs_rtc_regs *)MXS_RTC_BASE;
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debug("SPL: Setting auto-restart bit\n");
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writel(RTC_CTRL_SFTRST, &rtc_regs->hw_rtc_ctrl_clr);
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while (readl(&rtc_regs->hw_rtc_ctrl) & RTC_CTRL_SFTRST)
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;
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writel(RTC_CTRL_CLKGATE, &rtc_regs->hw_rtc_ctrl_clr);
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while (readl(&rtc_regs->hw_rtc_ctrl) & RTC_CTRL_CLKGATE)
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;
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/* Do nothing if flag already set */
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if (readl(&rtc_regs->hw_rtc_persistent0) & RTC_PERSISTENT0_AUTO_RESTART)
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return;
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while (readl(&rtc_regs->hw_rtc_stat) & RTC_STAT_NEW_REGS_MASK)
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;
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setbits_le32(&rtc_regs->hw_rtc_persistent0,
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RTC_PERSISTENT0_AUTO_RESTART);
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writel(RTC_CTRL_FORCE_UPDATE, &rtc_regs->hw_rtc_ctrl_set);
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writel(RTC_CTRL_FORCE_UPDATE, &rtc_regs->hw_rtc_ctrl_clr);
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while (readl(&rtc_regs->hw_rtc_stat) & RTC_STAT_NEW_REGS_MASK)
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;
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while (readl(&rtc_regs->hw_rtc_stat) & RTC_STAT_STALE_REGS_MASK)
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;
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}
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/**
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* mxs_power_set_linreg() - Set linear regulators 25mV below DC-DC converter
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*
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* This function configures the VDDIO, VDDA and VDDD linear regulators output
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* to be 25mV below the VDDIO, VDDA and VDDD output from the DC-DC switching
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* converter. This is the recommended setting for the case where we use both
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* linear regulators and DC-DC converter to power the VDDIO rail.
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*/
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static void mxs_power_set_linreg(void)
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{
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struct mxs_power_regs *power_regs =
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(struct mxs_power_regs *)MXS_POWER_BASE;
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/* Set linear regulator 25mV below switching converter */
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debug("SPL: Setting VDDD 25mV below DC-DC converters\n");
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clrsetbits_le32(&power_regs->hw_power_vdddctrl,
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POWER_VDDDCTRL_LINREG_OFFSET_MASK,
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POWER_VDDDCTRL_LINREG_OFFSET_1STEPS_BELOW);
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debug("SPL: Setting VDDA 25mV below DC-DC converters\n");
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clrsetbits_le32(&power_regs->hw_power_vddactrl,
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POWER_VDDACTRL_LINREG_OFFSET_MASK,
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POWER_VDDACTRL_LINREG_OFFSET_1STEPS_BELOW);
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debug("SPL: Setting VDDIO 25mV below DC-DC converters\n");
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clrsetbits_le32(&power_regs->hw_power_vddioctrl,
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POWER_VDDIOCTRL_LINREG_OFFSET_MASK,
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POWER_VDDIOCTRL_LINREG_OFFSET_1STEPS_BELOW);
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}
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/**
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* mxs_get_batt_volt() - Measure battery input voltage
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*
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* This function retrieves the battery input voltage and returns it.
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*/
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static int mxs_get_batt_volt(void)
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{
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struct mxs_power_regs *power_regs =
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(struct mxs_power_regs *)MXS_POWER_BASE;
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uint32_t volt = readl(&power_regs->hw_power_battmonitor);
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volt &= POWER_BATTMONITOR_BATT_VAL_MASK;
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volt >>= POWER_BATTMONITOR_BATT_VAL_OFFSET;
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volt *= 8;
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debug("SPL: Battery Voltage = %dmV\n", volt);
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return volt;
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}
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/**
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* mxs_is_batt_ready() - Test if the battery provides enough voltage to boot
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*
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* This function checks if the battery input voltage is higher than 3.6V and
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* therefore allows the system to successfully boot using this power source.
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*/
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static int mxs_is_batt_ready(void)
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{
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return (mxs_get_batt_volt() >= 3600);
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}
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/**
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* mxs_is_batt_good() - Test if battery is operational at all
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*
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* This function starts recharging the battery and tests if the input current
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* provided by the 5V input recharging the battery is also sufficient to power
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* the DC-DC converter.
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*/
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static int mxs_is_batt_good(void)
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{
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struct mxs_power_regs *power_regs =
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(struct mxs_power_regs *)MXS_POWER_BASE;
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uint32_t volt = mxs_get_batt_volt();
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if ((volt >= 2400) && (volt <= 4300)) {
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debug("SPL: Battery is good\n");
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return 1;
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}
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clrsetbits_le32(&power_regs->hw_power_5vctrl,
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POWER_5VCTRL_CHARGE_4P2_ILIMIT_MASK,
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0x3 << POWER_5VCTRL_CHARGE_4P2_ILIMIT_OFFSET);
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writel(POWER_5VCTRL_PWD_CHARGE_4P2_MASK,
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&power_regs->hw_power_5vctrl_clr);
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clrsetbits_le32(&power_regs->hw_power_charge,
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POWER_CHARGE_STOP_ILIMIT_MASK | POWER_CHARGE_BATTCHRG_I_MASK,
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POWER_CHARGE_STOP_ILIMIT_10MA | 0x3);
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writel(POWER_CHARGE_PWD_BATTCHRG, &power_regs->hw_power_charge_clr);
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writel(POWER_5VCTRL_PWD_CHARGE_4P2_MASK,
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&power_regs->hw_power_5vctrl_clr);
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early_delay(500000);
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volt = mxs_get_batt_volt();
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if (volt >= 3500) {
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debug("SPL: Battery Voltage too high\n");
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return 0;
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}
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if (volt >= 2400) {
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debug("SPL: Battery is good\n");
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return 1;
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}
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writel(POWER_CHARGE_STOP_ILIMIT_MASK | POWER_CHARGE_BATTCHRG_I_MASK,
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&power_regs->hw_power_charge_clr);
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writel(POWER_CHARGE_PWD_BATTCHRG, &power_regs->hw_power_charge_set);
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debug("SPL: Battery Voltage too low\n");
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return 0;
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}
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/**
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* mxs_power_setup_5v_detect() - Start the 5V input detection comparator
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*
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* This function enables the 5V detection comparator and sets the 5V valid
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* threshold to 4.4V . We use 4.4V threshold here to make sure that even
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* under high load, the voltage drop on the 5V input won't be so critical
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* to cause undervolt on the 4P2 linear regulator supplying the DC-DC
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* converter and thus making the system crash.
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*/
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static void mxs_power_setup_5v_detect(void)
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{
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struct mxs_power_regs *power_regs =
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(struct mxs_power_regs *)MXS_POWER_BASE;
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/* Start 5V detection */
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debug("SPL: Starting 5V input detection comparator\n");
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clrsetbits_le32(&power_regs->hw_power_5vctrl,
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POWER_5VCTRL_VBUSVALID_TRSH_MASK,
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POWER_5VCTRL_VBUSVALID_TRSH_4V4 |
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POWER_5VCTRL_PWRUP_VBUS_CMPS);
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}
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/**
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* mxs_power_switch_dcdc_clocksource() - Switch PLL clock for DC-DC converters
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* @freqsel: One of the POWER_MISC_FREQSEL_xxx defines to select the clock
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*
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* This function configures and then enables an alternative PLL clock source
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* for the DC-DC converters.
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*/
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void mxs_power_switch_dcdc_clocksource(uint32_t freqsel)
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{
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struct mxs_power_regs *power_regs =
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(struct mxs_power_regs *)MXS_POWER_BASE;
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/* Select clocksource for DC-DC converters */
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clrsetbits_le32(&power_regs->hw_power_misc,
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POWER_MISC_FREQSEL_MASK,
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freqsel);
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setbits_le32(&power_regs->hw_power_misc,
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POWER_MISC_SEL_PLLCLK);
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}
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/**
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* mxs_power_setup_dcdc_clocksource() - Setup PLL clock source for DC-DC converters
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*
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* Normally, there is no need to switch DC-DC clocksource. This is the reason,
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* why this function is a stub and does nothing. However, boards can implement
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* this function when required and call mxs_power_switch_dcdc_clocksource() to
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* switch to an alternative clock source.
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*/
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__weak void mxs_power_setup_dcdc_clocksource(void)
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{
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debug("SPL: Using default DC-DC clocksource\n");
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}
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/**
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* mxs_src_power_init() - Preconfigure the power block
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*
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* This function configures reasonable values for the DC-DC control loop
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* and battery monitor.
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*/
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static void mxs_src_power_init(void)
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{
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struct mxs_power_regs *power_regs =
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(struct mxs_power_regs *)MXS_POWER_BASE;
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debug("SPL: Pre-Configuring power block\n");
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/* Improve efficieny and reduce transient ripple */
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writel(POWER_LOOPCTRL_TOGGLE_DIF | POWER_LOOPCTRL_EN_CM_HYST |
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POWER_LOOPCTRL_EN_DF_HYST, &power_regs->hw_power_loopctrl_set);
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clrsetbits_le32(&power_regs->hw_power_dclimits,
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POWER_DCLIMITS_POSLIMIT_BUCK_MASK,
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0x30 << POWER_DCLIMITS_POSLIMIT_BUCK_OFFSET);
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setbits_le32(&power_regs->hw_power_battmonitor,
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POWER_BATTMONITOR_EN_BATADJ);
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/* Increase the RCSCALE level for quick DCDC response to dynamic load */
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clrsetbits_le32(&power_regs->hw_power_loopctrl,
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POWER_LOOPCTRL_EN_RCSCALE_MASK,
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POWER_LOOPCTRL_RCSCALE_THRESH |
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POWER_LOOPCTRL_EN_RCSCALE_8X);
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clrsetbits_le32(&power_regs->hw_power_minpwr,
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POWER_MINPWR_HALFFETS, POWER_MINPWR_DOUBLE_FETS);
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/* 5V to battery handoff ... FIXME */
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setbits_le32(&power_regs->hw_power_5vctrl, POWER_5VCTRL_DCDC_XFER);
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early_delay(30);
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clrbits_le32(&power_regs->hw_power_5vctrl, POWER_5VCTRL_DCDC_XFER);
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}
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/**
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* mxs_power_init_4p2_params() - Configure the parameters of the 4P2 regulator
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*
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* This function configures the necessary parameters for the 4P2 linear
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* regulator to supply the DC-DC converter from 5V input.
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*/
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static void mxs_power_init_4p2_params(void)
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{
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struct mxs_power_regs *power_regs =
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(struct mxs_power_regs *)MXS_POWER_BASE;
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debug("SPL: Configuring common 4P2 regulator params\n");
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/* Setup 4P2 parameters */
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clrsetbits_le32(&power_regs->hw_power_dcdc4p2,
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POWER_DCDC4P2_CMPTRIP_MASK | POWER_DCDC4P2_TRG_MASK,
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POWER_DCDC4P2_TRG_4V2 | (31 << POWER_DCDC4P2_CMPTRIP_OFFSET));
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clrsetbits_le32(&power_regs->hw_power_5vctrl,
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POWER_5VCTRL_HEADROOM_ADJ_MASK,
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0x4 << POWER_5VCTRL_HEADROOM_ADJ_OFFSET);
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clrsetbits_le32(&power_regs->hw_power_dcdc4p2,
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POWER_DCDC4P2_DROPOUT_CTRL_MASK,
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DCDC4P2_DROPOUT_CONFIG);
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clrsetbits_le32(&power_regs->hw_power_5vctrl,
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POWER_5VCTRL_CHARGE_4P2_ILIMIT_MASK,
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0x3f << POWER_5VCTRL_CHARGE_4P2_ILIMIT_OFFSET);
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}
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/**
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* mxs_enable_4p2_dcdc_input() - Enable or disable the DCDC input from 4P2
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* @xfer: Select if the input shall be enabled or disabled
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*
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* This function enables or disables the 4P2 input into the DC-DC converter.
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*/
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static void mxs_enable_4p2_dcdc_input(int xfer)
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{
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struct mxs_power_regs *power_regs =
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(struct mxs_power_regs *)MXS_POWER_BASE;
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uint32_t tmp, vbus_thresh, vbus_5vdetect, pwd_bo;
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uint32_t prev_5v_brnout, prev_5v_droop;
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debug("SPL: %s 4P2 DC-DC Input\n", xfer ? "Enabling" : "Disabling");
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if (xfer && (readl(&power_regs->hw_power_5vctrl) &
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POWER_5VCTRL_ENABLE_DCDC)) {
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return;
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}
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prev_5v_brnout = readl(&power_regs->hw_power_5vctrl) &
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POWER_5VCTRL_PWDN_5VBRNOUT;
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prev_5v_droop = readl(&power_regs->hw_power_ctrl) &
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POWER_CTRL_ENIRQ_VDD5V_DROOP;
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clrbits_le32(&power_regs->hw_power_5vctrl, POWER_5VCTRL_PWDN_5VBRNOUT);
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writel(POWER_RESET_UNLOCK_KEY | POWER_RESET_PWD_OFF,
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&power_regs->hw_power_reset);
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clrbits_le32(&power_regs->hw_power_ctrl, POWER_CTRL_ENIRQ_VDD5V_DROOP);
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/*
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* Recording orignal values that will be modified temporarlily
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* to handle a chip bug. See chip errata for CQ ENGR00115837
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*/
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tmp = readl(&power_regs->hw_power_5vctrl);
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vbus_thresh = tmp & POWER_5VCTRL_VBUSVALID_TRSH_MASK;
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vbus_5vdetect = tmp & POWER_5VCTRL_VBUSVALID_5VDETECT;
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pwd_bo = readl(&power_regs->hw_power_minpwr) & POWER_MINPWR_PWD_BO;
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/*
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* Disable mechanisms that get erroneously tripped by when setting
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* the DCDC4P2 EN_DCDC
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*/
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clrbits_le32(&power_regs->hw_power_5vctrl,
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POWER_5VCTRL_VBUSVALID_5VDETECT |
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POWER_5VCTRL_VBUSVALID_TRSH_MASK);
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writel(POWER_MINPWR_PWD_BO, &power_regs->hw_power_minpwr_set);
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if (xfer) {
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setbits_le32(&power_regs->hw_power_5vctrl,
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POWER_5VCTRL_DCDC_XFER);
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early_delay(20);
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clrbits_le32(&power_regs->hw_power_5vctrl,
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POWER_5VCTRL_DCDC_XFER);
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setbits_le32(&power_regs->hw_power_5vctrl,
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POWER_5VCTRL_ENABLE_DCDC);
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} else {
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setbits_le32(&power_regs->hw_power_dcdc4p2,
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POWER_DCDC4P2_ENABLE_DCDC);
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}
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early_delay(25);
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clrsetbits_le32(&power_regs->hw_power_5vctrl,
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POWER_5VCTRL_VBUSVALID_TRSH_MASK, vbus_thresh);
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if (vbus_5vdetect)
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writel(vbus_5vdetect, &power_regs->hw_power_5vctrl_set);
|
|
|
|
if (!pwd_bo)
|
|
clrbits_le32(&power_regs->hw_power_minpwr, POWER_MINPWR_PWD_BO);
|
|
|
|
while (readl(&power_regs->hw_power_ctrl) & POWER_CTRL_VBUS_VALID_IRQ)
|
|
writel(POWER_CTRL_VBUS_VALID_IRQ,
|
|
&power_regs->hw_power_ctrl_clr);
|
|
|
|
if (prev_5v_brnout) {
|
|
writel(POWER_5VCTRL_PWDN_5VBRNOUT,
|
|
&power_regs->hw_power_5vctrl_set);
|
|
writel(POWER_RESET_UNLOCK_KEY,
|
|
&power_regs->hw_power_reset);
|
|
} else {
|
|
writel(POWER_5VCTRL_PWDN_5VBRNOUT,
|
|
&power_regs->hw_power_5vctrl_clr);
|
|
writel(POWER_RESET_UNLOCK_KEY | POWER_RESET_PWD_OFF,
|
|
&power_regs->hw_power_reset);
|
|
}
|
|
|
|
while (readl(&power_regs->hw_power_ctrl) & POWER_CTRL_VDD5V_DROOP_IRQ)
|
|
writel(POWER_CTRL_VDD5V_DROOP_IRQ,
|
|
&power_regs->hw_power_ctrl_clr);
|
|
|
|
if (prev_5v_droop)
|
|
clrbits_le32(&power_regs->hw_power_ctrl,
|
|
POWER_CTRL_ENIRQ_VDD5V_DROOP);
|
|
else
|
|
setbits_le32(&power_regs->hw_power_ctrl,
|
|
POWER_CTRL_ENIRQ_VDD5V_DROOP);
|
|
}
|
|
|
|
/**
|
|
* mxs_power_init_4p2_regulator() - Start the 4P2 regulator
|
|
*
|
|
* This function enables the 4P2 regulator and switches the DC-DC converter
|
|
* to use the 4P2 input.
|
|
*/
|
|
static void mxs_power_init_4p2_regulator(void)
|
|
{
|
|
struct mxs_power_regs *power_regs =
|
|
(struct mxs_power_regs *)MXS_POWER_BASE;
|
|
uint32_t tmp, tmp2;
|
|
|
|
debug("SPL: Enabling 4P2 regulator\n");
|
|
|
|
setbits_le32(&power_regs->hw_power_dcdc4p2, POWER_DCDC4P2_ENABLE_4P2);
|
|
|
|
writel(POWER_CHARGE_ENABLE_LOAD, &power_regs->hw_power_charge_set);
|
|
|
|
writel(POWER_5VCTRL_CHARGE_4P2_ILIMIT_MASK,
|
|
&power_regs->hw_power_5vctrl_clr);
|
|
clrbits_le32(&power_regs->hw_power_dcdc4p2, POWER_DCDC4P2_TRG_MASK);
|
|
|
|
/* Power up the 4p2 rail and logic/control */
|
|
writel(POWER_5VCTRL_PWD_CHARGE_4P2_MASK,
|
|
&power_regs->hw_power_5vctrl_clr);
|
|
|
|
/*
|
|
* Start charging up the 4p2 capacitor. We ramp of this charge
|
|
* gradually to avoid large inrush current from the 5V cable which can
|
|
* cause transients/problems
|
|
*/
|
|
debug("SPL: Charging 4P2 capacitor\n");
|
|
mxs_enable_4p2_dcdc_input(0);
|
|
|
|
if (readl(&power_regs->hw_power_ctrl) & POWER_CTRL_VBUS_VALID_IRQ) {
|
|
/*
|
|
* If we arrived here, we were unable to recover from mx23 chip
|
|
* errata 5837. 4P2 is disabled and sufficient battery power is
|
|
* not present. Exiting to not enable DCDC power during 5V
|
|
* connected state.
|
|
*/
|
|
clrbits_le32(&power_regs->hw_power_dcdc4p2,
|
|
POWER_DCDC4P2_ENABLE_DCDC);
|
|
writel(POWER_5VCTRL_PWD_CHARGE_4P2_MASK,
|
|
&power_regs->hw_power_5vctrl_set);
|
|
|
|
debug("SPL: Unable to recover from mx23 errata 5837\n");
|
|
hang();
|
|
}
|
|
|
|
/*
|
|
* Here we set the 4p2 brownout level to something very close to 4.2V.
|
|
* We then check the brownout status. If the brownout status is false,
|
|
* the voltage is already close to the target voltage of 4.2V so we
|
|
* can go ahead and set the 4P2 current limit to our max target limit.
|
|
* If the brownout status is true, we need to ramp us the current limit
|
|
* so that we don't cause large inrush current issues. We step up the
|
|
* current limit until the brownout status is false or until we've
|
|
* reached our maximum defined 4p2 current limit.
|
|
*/
|
|
debug("SPL: Setting 4P2 brownout level\n");
|
|
clrsetbits_le32(&power_regs->hw_power_dcdc4p2,
|
|
POWER_DCDC4P2_BO_MASK,
|
|
22 << POWER_DCDC4P2_BO_OFFSET); /* 4.15V */
|
|
|
|
if (!(readl(&power_regs->hw_power_sts) & POWER_STS_DCDC_4P2_BO)) {
|
|
setbits_le32(&power_regs->hw_power_5vctrl,
|
|
0x3f << POWER_5VCTRL_CHARGE_4P2_ILIMIT_OFFSET);
|
|
} else {
|
|
tmp = (readl(&power_regs->hw_power_5vctrl) &
|
|
POWER_5VCTRL_CHARGE_4P2_ILIMIT_MASK) >>
|
|
POWER_5VCTRL_CHARGE_4P2_ILIMIT_OFFSET;
|
|
while (tmp < 0x3f) {
|
|
if (!(readl(&power_regs->hw_power_sts) &
|
|
POWER_STS_DCDC_4P2_BO)) {
|
|
tmp = readl(&power_regs->hw_power_5vctrl);
|
|
tmp |= POWER_5VCTRL_CHARGE_4P2_ILIMIT_MASK;
|
|
early_delay(100);
|
|
writel(tmp, &power_regs->hw_power_5vctrl);
|
|
break;
|
|
} else {
|
|
tmp++;
|
|
tmp2 = readl(&power_regs->hw_power_5vctrl);
|
|
tmp2 &= ~POWER_5VCTRL_CHARGE_4P2_ILIMIT_MASK;
|
|
tmp2 |= tmp <<
|
|
POWER_5VCTRL_CHARGE_4P2_ILIMIT_OFFSET;
|
|
writel(tmp2, &power_regs->hw_power_5vctrl);
|
|
early_delay(100);
|
|
}
|
|
}
|
|
}
|
|
|
|
clrbits_le32(&power_regs->hw_power_dcdc4p2, POWER_DCDC4P2_BO_MASK);
|
|
writel(POWER_CTRL_DCDC4P2_BO_IRQ, &power_regs->hw_power_ctrl_clr);
|
|
}
|
|
|
|
/**
|
|
* mxs_power_init_dcdc_4p2_source() - Switch DC-DC converter to 4P2 source
|
|
*
|
|
* This function configures the DC-DC converter to be supplied from the 4P2
|
|
* linear regulator.
|
|
*/
|
|
static void mxs_power_init_dcdc_4p2_source(void)
|
|
{
|
|
struct mxs_power_regs *power_regs =
|
|
(struct mxs_power_regs *)MXS_POWER_BASE;
|
|
|
|
debug("SPL: Switching DC-DC converters to 4P2\n");
|
|
|
|
if (!(readl(&power_regs->hw_power_dcdc4p2) &
|
|
POWER_DCDC4P2_ENABLE_DCDC)) {
|
|
debug("SPL: Already switched - aborting\n");
|
|
hang();
|
|
}
|
|
|
|
mxs_enable_4p2_dcdc_input(1);
|
|
|
|
if (readl(&power_regs->hw_power_ctrl) & POWER_CTRL_VBUS_VALID_IRQ) {
|
|
clrbits_le32(&power_regs->hw_power_dcdc4p2,
|
|
POWER_DCDC4P2_ENABLE_DCDC);
|
|
writel(POWER_5VCTRL_ENABLE_DCDC,
|
|
&power_regs->hw_power_5vctrl_clr);
|
|
writel(POWER_5VCTRL_PWD_CHARGE_4P2_MASK,
|
|
&power_regs->hw_power_5vctrl_set);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* mxs_power_enable_4p2() - Power up the 4P2 regulator
|
|
*
|
|
* This function drives the process of powering up the 4P2 linear regulator
|
|
* and switching the DC-DC converter input over to the 4P2 linear regulator.
|
|
*/
|
|
static void mxs_power_enable_4p2(void)
|
|
{
|
|
struct mxs_power_regs *power_regs =
|
|
(struct mxs_power_regs *)MXS_POWER_BASE;
|
|
uint32_t vdddctrl, vddactrl, vddioctrl;
|
|
uint32_t tmp;
|
|
|
|
debug("SPL: Powering up 4P2 regulator\n");
|
|
|
|
vdddctrl = readl(&power_regs->hw_power_vdddctrl);
|
|
vddactrl = readl(&power_regs->hw_power_vddactrl);
|
|
vddioctrl = readl(&power_regs->hw_power_vddioctrl);
|
|
|
|
setbits_le32(&power_regs->hw_power_vdddctrl,
|
|
POWER_VDDDCTRL_DISABLE_FET | POWER_VDDDCTRL_ENABLE_LINREG |
|
|
POWER_VDDDCTRL_PWDN_BRNOUT);
|
|
|
|
setbits_le32(&power_regs->hw_power_vddactrl,
|
|
POWER_VDDACTRL_DISABLE_FET | POWER_VDDACTRL_ENABLE_LINREG |
|
|
POWER_VDDACTRL_PWDN_BRNOUT);
|
|
|
|
setbits_le32(&power_regs->hw_power_vddioctrl,
|
|
POWER_VDDIOCTRL_DISABLE_FET | POWER_VDDIOCTRL_PWDN_BRNOUT);
|
|
|
|
mxs_power_init_4p2_params();
|
|
mxs_power_init_4p2_regulator();
|
|
|
|
/* Shutdown battery (none present) */
|
|
if (!mxs_is_batt_ready()) {
|
|
clrbits_le32(&power_regs->hw_power_dcdc4p2,
|
|
POWER_DCDC4P2_BO_MASK);
|
|
writel(POWER_CTRL_DCDC4P2_BO_IRQ,
|
|
&power_regs->hw_power_ctrl_clr);
|
|
writel(POWER_CTRL_ENIRQ_DCDC4P2_BO,
|
|
&power_regs->hw_power_ctrl_clr);
|
|
}
|
|
|
|
mxs_power_init_dcdc_4p2_source();
|
|
|
|
writel(vdddctrl, &power_regs->hw_power_vdddctrl);
|
|
early_delay(20);
|
|
writel(vddactrl, &power_regs->hw_power_vddactrl);
|
|
early_delay(20);
|
|
writel(vddioctrl, &power_regs->hw_power_vddioctrl);
|
|
|
|
/*
|
|
* Check if FET is enabled on either powerout and if so,
|
|
* disable load.
|
|
*/
|
|
tmp = 0;
|
|
tmp |= !(readl(&power_regs->hw_power_vdddctrl) &
|
|
POWER_VDDDCTRL_DISABLE_FET);
|
|
tmp |= !(readl(&power_regs->hw_power_vddactrl) &
|
|
POWER_VDDACTRL_DISABLE_FET);
|
|
tmp |= !(readl(&power_regs->hw_power_vddioctrl) &
|
|
POWER_VDDIOCTRL_DISABLE_FET);
|
|
if (tmp)
|
|
writel(POWER_CHARGE_ENABLE_LOAD,
|
|
&power_regs->hw_power_charge_clr);
|
|
|
|
debug("SPL: 4P2 regulator powered-up\n");
|
|
}
|
|
|
|
/**
|
|
* mxs_boot_valid_5v() - Boot from 5V supply
|
|
*
|
|
* This function configures the power block to boot from valid 5V input.
|
|
* This is called only if the 5V is reliable and can properly supply the
|
|
* CPU. This function proceeds to configure the 4P2 converter to be supplied
|
|
* from the 5V input.
|
|
*/
|
|
static void mxs_boot_valid_5v(void)
|
|
{
|
|
struct mxs_power_regs *power_regs =
|
|
(struct mxs_power_regs *)MXS_POWER_BASE;
|
|
|
|
debug("SPL: Booting from 5V supply\n");
|
|
|
|
/*
|
|
* Use VBUSVALID level instead of VDD5V_GT_VDDIO level to trigger a 5V
|
|
* disconnect event. FIXME
|
|
*/
|
|
writel(POWER_5VCTRL_VBUSVALID_5VDETECT,
|
|
&power_regs->hw_power_5vctrl_set);
|
|
|
|
/* Configure polarity to check for 5V disconnection. */
|
|
writel(POWER_CTRL_POLARITY_VBUSVALID |
|
|
POWER_CTRL_POLARITY_VDD5V_GT_VDDIO,
|
|
&power_regs->hw_power_ctrl_clr);
|
|
|
|
writel(POWER_CTRL_VBUS_VALID_IRQ | POWER_CTRL_VDD5V_GT_VDDIO_IRQ,
|
|
&power_regs->hw_power_ctrl_clr);
|
|
|
|
mxs_power_enable_4p2();
|
|
}
|
|
|
|
/**
|
|
* mxs_powerdown() - Shut down the system
|
|
*
|
|
* This function powers down the CPU completely.
|
|
*/
|
|
static void mxs_powerdown(void)
|
|
{
|
|
struct mxs_power_regs *power_regs =
|
|
(struct mxs_power_regs *)MXS_POWER_BASE;
|
|
|
|
debug("Powering Down\n");
|
|
|
|
writel(POWER_RESET_UNLOCK_KEY, &power_regs->hw_power_reset);
|
|
writel(POWER_RESET_UNLOCK_KEY | POWER_RESET_PWD_OFF,
|
|
&power_regs->hw_power_reset);
|
|
}
|
|
|
|
/**
|
|
* mxs_batt_boot() - Configure the power block to boot from battery input
|
|
*
|
|
* This function configures the power block to boot from the battery voltage
|
|
* supply.
|
|
*/
|
|
static void mxs_batt_boot(void)
|
|
{
|
|
struct mxs_power_regs *power_regs =
|
|
(struct mxs_power_regs *)MXS_POWER_BASE;
|
|
|
|
debug("SPL: Configuring power block to boot from battery\n");
|
|
|
|
clrbits_le32(&power_regs->hw_power_5vctrl, POWER_5VCTRL_PWDN_5VBRNOUT);
|
|
clrbits_le32(&power_regs->hw_power_5vctrl, POWER_5VCTRL_ENABLE_DCDC);
|
|
|
|
clrbits_le32(&power_regs->hw_power_dcdc4p2,
|
|
POWER_DCDC4P2_ENABLE_DCDC | POWER_DCDC4P2_ENABLE_4P2);
|
|
writel(POWER_CHARGE_ENABLE_LOAD, &power_regs->hw_power_charge_clr);
|
|
|
|
/* 5V to battery handoff. */
|
|
setbits_le32(&power_regs->hw_power_5vctrl, POWER_5VCTRL_DCDC_XFER);
|
|
early_delay(30);
|
|
clrbits_le32(&power_regs->hw_power_5vctrl, POWER_5VCTRL_DCDC_XFER);
|
|
|
|
writel(POWER_CTRL_ENIRQ_DCDC4P2_BO, &power_regs->hw_power_ctrl_clr);
|
|
|
|
clrsetbits_le32(&power_regs->hw_power_minpwr,
|
|
POWER_MINPWR_HALFFETS, POWER_MINPWR_DOUBLE_FETS);
|
|
|
|
mxs_power_set_linreg();
|
|
|
|
clrbits_le32(&power_regs->hw_power_vdddctrl,
|
|
POWER_VDDDCTRL_DISABLE_FET | POWER_VDDDCTRL_ENABLE_LINREG);
|
|
|
|
clrbits_le32(&power_regs->hw_power_vddactrl,
|
|
POWER_VDDACTRL_DISABLE_FET | POWER_VDDACTRL_ENABLE_LINREG);
|
|
|
|
clrbits_le32(&power_regs->hw_power_vddioctrl,
|
|
POWER_VDDIOCTRL_DISABLE_FET);
|
|
|
|
setbits_le32(&power_regs->hw_power_5vctrl,
|
|
POWER_5VCTRL_PWD_CHARGE_4P2_MASK);
|
|
|
|
setbits_le32(&power_regs->hw_power_5vctrl,
|
|
POWER_5VCTRL_ENABLE_DCDC);
|
|
|
|
clrsetbits_le32(&power_regs->hw_power_5vctrl,
|
|
POWER_5VCTRL_CHARGE_4P2_ILIMIT_MASK,
|
|
0x8 << POWER_5VCTRL_CHARGE_4P2_ILIMIT_OFFSET);
|
|
|
|
mxs_power_enable_4p2();
|
|
}
|
|
|
|
/**
|
|
* mxs_handle_5v_conflict() - Test if the 5V input is reliable
|
|
*
|
|
* This function tests if the 5V input can reliably supply the system. If it
|
|
* can, then proceed to configuring the system to boot from 5V source, otherwise
|
|
* try booting from battery supply. If we can not boot from battery supply
|
|
* either, shut down the system.
|
|
*/
|
|
static void mxs_handle_5v_conflict(void)
|
|
{
|
|
struct mxs_power_regs *power_regs =
|
|
(struct mxs_power_regs *)MXS_POWER_BASE;
|
|
uint32_t tmp;
|
|
|
|
debug("SPL: Resolving 5V conflict\n");
|
|
|
|
setbits_le32(&power_regs->hw_power_vddioctrl,
|
|
POWER_VDDIOCTRL_BO_OFFSET_MASK);
|
|
|
|
for (;;) {
|
|
tmp = readl(&power_regs->hw_power_sts);
|
|
|
|
if (tmp & POWER_STS_VDDIO_BO) {
|
|
/*
|
|
* VDDIO has a brownout, then the VDD5V_GT_VDDIO becomes
|
|
* unreliable
|
|
*/
|
|
debug("SPL: VDDIO has a brownout\n");
|
|
mxs_powerdown();
|
|
break;
|
|
}
|
|
|
|
if (tmp & POWER_STS_VDD5V_GT_VDDIO) {
|
|
debug("SPL: POWER_STS_VDD5V_GT_VDDIO is set\n");
|
|
mxs_boot_valid_5v();
|
|
break;
|
|
} else {
|
|
debug("SPL: POWER_STS_VDD5V_GT_VDDIO is not set\n");
|
|
mxs_powerdown();
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* TODO: I can't see this being reached. We'll either
|
|
* powerdown or boot from a stable 5V supply.
|
|
*/
|
|
if (tmp & POWER_STS_PSWITCH_MASK) {
|
|
debug("SPL: POWER_STS_PSWITCH_MASK is set\n");
|
|
mxs_batt_boot();
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* mxs_5v_boot() - Configure the power block to boot from 5V input
|
|
*
|
|
* This function handles configuration of the power block when supplied by
|
|
* a 5V input.
|
|
*/
|
|
static void mxs_5v_boot(void)
|
|
{
|
|
struct mxs_power_regs *power_regs =
|
|
(struct mxs_power_regs *)MXS_POWER_BASE;
|
|
|
|
debug("SPL: Configuring power block to boot from 5V input\n");
|
|
|
|
/*
|
|
* NOTE: In original IMX-Bootlets, this also checks for VBUSVALID,
|
|
* but their implementation always returns 1 so we omit it here.
|
|
*/
|
|
if (readl(&power_regs->hw_power_sts) & POWER_STS_VDD5V_GT_VDDIO) {
|
|
debug("SPL: 5V VDD good\n");
|
|
mxs_boot_valid_5v();
|
|
return;
|
|
}
|
|
|
|
early_delay(1000);
|
|
if (readl(&power_regs->hw_power_sts) & POWER_STS_VDD5V_GT_VDDIO) {
|
|
debug("SPL: 5V VDD good (after delay)\n");
|
|
mxs_boot_valid_5v();
|
|
return;
|
|
}
|
|
|
|
debug("SPL: 5V VDD not good\n");
|
|
mxs_handle_5v_conflict();
|
|
}
|
|
|
|
/**
|
|
* mxs_init_batt_bo() - Configure battery brownout threshold
|
|
*
|
|
* This function configures the battery input brownout threshold. The value
|
|
* at which the battery brownout happens is configured to 3.0V in the code.
|
|
*/
|
|
static void mxs_init_batt_bo(void)
|
|
{
|
|
struct mxs_power_regs *power_regs =
|
|
(struct mxs_power_regs *)MXS_POWER_BASE;
|
|
|
|
debug("SPL: Initialising battery brown-out level to 3.0V\n");
|
|
|
|
/* Brownout at 3V */
|
|
clrsetbits_le32(&power_regs->hw_power_battmonitor,
|
|
POWER_BATTMONITOR_BRWNOUT_LVL_MASK,
|
|
15 << POWER_BATTMONITOR_BRWNOUT_LVL_OFFSET);
|
|
|
|
writel(POWER_CTRL_BATT_BO_IRQ, &power_regs->hw_power_ctrl_clr);
|
|
writel(POWER_CTRL_ENIRQ_BATT_BO, &power_regs->hw_power_ctrl_clr);
|
|
}
|
|
|
|
/**
|
|
* mxs_switch_vddd_to_dcdc_source() - Switch VDDD rail to DC-DC converter
|
|
*
|
|
* This function turns off the VDDD linear regulator and therefore makes
|
|
* the VDDD rail be supplied only by the DC-DC converter.
|
|
*/
|
|
static void mxs_switch_vddd_to_dcdc_source(void)
|
|
{
|
|
struct mxs_power_regs *power_regs =
|
|
(struct mxs_power_regs *)MXS_POWER_BASE;
|
|
|
|
debug("SPL: Switching VDDD to DC-DC converters\n");
|
|
|
|
clrsetbits_le32(&power_regs->hw_power_vdddctrl,
|
|
POWER_VDDDCTRL_LINREG_OFFSET_MASK,
|
|
POWER_VDDDCTRL_LINREG_OFFSET_1STEPS_BELOW);
|
|
|
|
clrbits_le32(&power_regs->hw_power_vdddctrl,
|
|
POWER_VDDDCTRL_DISABLE_FET | POWER_VDDDCTRL_ENABLE_LINREG |
|
|
POWER_VDDDCTRL_DISABLE_STEPPING);
|
|
}
|
|
|
|
/**
|
|
* mxs_power_configure_power_source() - Configure power block source
|
|
*
|
|
* This function is the core of the power configuration logic. The function
|
|
* selects the power block input source and configures the whole power block
|
|
* accordingly. After the configuration is complete and the system is stable
|
|
* again, the function switches the CPU clock source back to PLL. Finally,
|
|
* the function switches the voltage rails to DC-DC converter.
|
|
*/
|
|
static void mxs_power_configure_power_source(void)
|
|
{
|
|
int batt_ready, batt_good;
|
|
struct mxs_power_regs *power_regs =
|
|
(struct mxs_power_regs *)MXS_POWER_BASE;
|
|
struct mxs_lradc_regs *lradc_regs =
|
|
(struct mxs_lradc_regs *)MXS_LRADC_BASE;
|
|
|
|
debug("SPL: Configuring power source\n");
|
|
|
|
mxs_power_setup_dcdc_clocksource();
|
|
mxs_src_power_init();
|
|
|
|
if (readl(&power_regs->hw_power_sts) & POWER_STS_VDD5V_GT_VDDIO) {
|
|
batt_ready = mxs_is_batt_ready();
|
|
if (batt_ready) {
|
|
/* 5V source detected, good battery detected. */
|
|
mxs_batt_boot();
|
|
} else {
|
|
batt_good = mxs_is_batt_good();
|
|
if (!batt_good) {
|
|
/* 5V source detected, bad battery detected. */
|
|
writel(LRADC_CONVERSION_AUTOMATIC,
|
|
&lradc_regs->hw_lradc_conversion_clr);
|
|
clrbits_le32(&power_regs->hw_power_battmonitor,
|
|
POWER_BATTMONITOR_BATT_VAL_MASK);
|
|
}
|
|
mxs_5v_boot();
|
|
}
|
|
} else {
|
|
/* 5V not detected, booting from battery. */
|
|
mxs_batt_boot();
|
|
}
|
|
|
|
/*
|
|
* TODO: Do not switch CPU clock to PLL if we are VDD5V is sourced
|
|
* from USB VBUS
|
|
*/
|
|
mxs_power_clock2pll();
|
|
|
|
mxs_init_batt_bo();
|
|
|
|
mxs_switch_vddd_to_dcdc_source();
|
|
|
|
#ifdef CONFIG_MX23
|
|
/* Fire up the VDDMEM LinReg now that we're all set. */
|
|
debug("SPL: Enabling mx23 VDDMEM linear regulator\n");
|
|
writel(POWER_VDDMEMCTRL_ENABLE_LINREG | POWER_VDDMEMCTRL_ENABLE_ILIMIT,
|
|
&power_regs->hw_power_vddmemctrl);
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* mxs_enable_output_rail_protection() - Enable power rail protection
|
|
*
|
|
* This function enables overload protection on the power rails. This is
|
|
* triggered if the power rails' voltage drops rapidly due to overload and
|
|
* in such case, the supply to the powerrail is cut-off, protecting the
|
|
* CPU from damage. Note that under such condition, the system will likely
|
|
* crash or misbehave.
|
|
*/
|
|
static void mxs_enable_output_rail_protection(void)
|
|
{
|
|
struct mxs_power_regs *power_regs =
|
|
(struct mxs_power_regs *)MXS_POWER_BASE;
|
|
|
|
debug("SPL: Enabling output rail protection\n");
|
|
|
|
writel(POWER_CTRL_VDDD_BO_IRQ | POWER_CTRL_VDDA_BO_IRQ |
|
|
POWER_CTRL_VDDIO_BO_IRQ, &power_regs->hw_power_ctrl_clr);
|
|
|
|
setbits_le32(&power_regs->hw_power_vdddctrl,
|
|
POWER_VDDDCTRL_PWDN_BRNOUT);
|
|
|
|
setbits_le32(&power_regs->hw_power_vddactrl,
|
|
POWER_VDDACTRL_PWDN_BRNOUT);
|
|
|
|
setbits_le32(&power_regs->hw_power_vddioctrl,
|
|
POWER_VDDIOCTRL_PWDN_BRNOUT);
|
|
}
|
|
|
|
/**
|
|
* mxs_get_vddio_power_source_off() - Get VDDIO rail power source
|
|
*
|
|
* This function tests if the VDDIO rail is supplied by linear regulator
|
|
* or by the DC-DC converter. Returns 1 if powered by linear regulator,
|
|
* returns 0 if powered by the DC-DC converter.
|
|
*/
|
|
static int mxs_get_vddio_power_source_off(void)
|
|
{
|
|
struct mxs_power_regs *power_regs =
|
|
(struct mxs_power_regs *)MXS_POWER_BASE;
|
|
uint32_t tmp;
|
|
|
|
if (readl(&power_regs->hw_power_sts) & POWER_STS_VDD5V_GT_VDDIO) {
|
|
tmp = readl(&power_regs->hw_power_vddioctrl);
|
|
if (tmp & POWER_VDDIOCTRL_DISABLE_FET) {
|
|
if ((tmp & POWER_VDDIOCTRL_LINREG_OFFSET_MASK) ==
|
|
POWER_VDDIOCTRL_LINREG_OFFSET_0STEPS) {
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
if (!(readl(&power_regs->hw_power_5vctrl) &
|
|
POWER_5VCTRL_ENABLE_DCDC)) {
|
|
if ((tmp & POWER_VDDIOCTRL_LINREG_OFFSET_MASK) ==
|
|
POWER_VDDIOCTRL_LINREG_OFFSET_0STEPS) {
|
|
return 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
/**
|
|
* mxs_get_vddd_power_source_off() - Get VDDD rail power source
|
|
*
|
|
* This function tests if the VDDD rail is supplied by linear regulator
|
|
* or by the DC-DC converter. Returns 1 if powered by linear regulator,
|
|
* returns 0 if powered by the DC-DC converter.
|
|
*/
|
|
static int mxs_get_vddd_power_source_off(void)
|
|
{
|
|
struct mxs_power_regs *power_regs =
|
|
(struct mxs_power_regs *)MXS_POWER_BASE;
|
|
uint32_t tmp;
|
|
|
|
tmp = readl(&power_regs->hw_power_vdddctrl);
|
|
if (tmp & POWER_VDDDCTRL_DISABLE_FET) {
|
|
if ((tmp & POWER_VDDDCTRL_LINREG_OFFSET_MASK) ==
|
|
POWER_VDDDCTRL_LINREG_OFFSET_0STEPS) {
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
if (readl(&power_regs->hw_power_sts) & POWER_STS_VDD5V_GT_VDDIO) {
|
|
if (!(readl(&power_regs->hw_power_5vctrl) &
|
|
POWER_5VCTRL_ENABLE_DCDC)) {
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
if (!(tmp & POWER_VDDDCTRL_ENABLE_LINREG)) {
|
|
if ((tmp & POWER_VDDDCTRL_LINREG_OFFSET_MASK) ==
|
|
POWER_VDDDCTRL_LINREG_OFFSET_1STEPS_BELOW) {
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct mxs_vddx_cfg {
|
|
uint32_t *reg;
|
|
uint8_t step_mV;
|
|
uint16_t lowest_mV;
|
|
int (*powered_by_linreg)(void);
|
|
uint32_t trg_mask;
|
|
uint32_t bo_irq;
|
|
uint32_t bo_enirq;
|
|
uint32_t bo_offset_mask;
|
|
uint32_t bo_offset_offset;
|
|
};
|
|
|
|
static const struct mxs_vddx_cfg mxs_vddio_cfg = {
|
|
.reg = &(((struct mxs_power_regs *)MXS_POWER_BASE)->
|
|
hw_power_vddioctrl),
|
|
#if defined(CONFIG_MX23)
|
|
.step_mV = 25,
|
|
#else
|
|
.step_mV = 50,
|
|
#endif
|
|
.lowest_mV = 2800,
|
|
.powered_by_linreg = mxs_get_vddio_power_source_off,
|
|
.trg_mask = POWER_VDDIOCTRL_TRG_MASK,
|
|
.bo_irq = POWER_CTRL_VDDIO_BO_IRQ,
|
|
.bo_enirq = POWER_CTRL_ENIRQ_VDDIO_BO,
|
|
.bo_offset_mask = POWER_VDDIOCTRL_BO_OFFSET_MASK,
|
|
.bo_offset_offset = POWER_VDDIOCTRL_BO_OFFSET_OFFSET,
|
|
};
|
|
|
|
static const struct mxs_vddx_cfg mxs_vddd_cfg = {
|
|
.reg = &(((struct mxs_power_regs *)MXS_POWER_BASE)->
|
|
hw_power_vdddctrl),
|
|
.step_mV = 25,
|
|
.lowest_mV = 800,
|
|
.powered_by_linreg = mxs_get_vddd_power_source_off,
|
|
.trg_mask = POWER_VDDDCTRL_TRG_MASK,
|
|
.bo_irq = POWER_CTRL_VDDD_BO_IRQ,
|
|
.bo_enirq = POWER_CTRL_ENIRQ_VDDD_BO,
|
|
.bo_offset_mask = POWER_VDDDCTRL_BO_OFFSET_MASK,
|
|
.bo_offset_offset = POWER_VDDDCTRL_BO_OFFSET_OFFSET,
|
|
};
|
|
|
|
#ifdef CONFIG_MX23
|
|
static const struct mxs_vddx_cfg mxs_vddmem_cfg = {
|
|
.reg = &(((struct mxs_power_regs *)MXS_POWER_BASE)->
|
|
hw_power_vddmemctrl),
|
|
.step_mV = 50,
|
|
.lowest_mV = 1700,
|
|
.powered_by_linreg = NULL,
|
|
.trg_mask = POWER_VDDMEMCTRL_TRG_MASK,
|
|
.bo_irq = 0,
|
|
.bo_enirq = 0,
|
|
.bo_offset_mask = 0,
|
|
.bo_offset_offset = 0,
|
|
};
|
|
#endif
|
|
|
|
/**
|
|
* mxs_power_set_vddx() - Configure voltage on DC-DC converter rail
|
|
* @cfg: Configuration data of the DC-DC converter rail
|
|
* @new_target: New target voltage of the DC-DC converter rail
|
|
* @new_brownout: New brownout trigger voltage
|
|
*
|
|
* This function configures the output voltage on the DC-DC converter rail.
|
|
* The rail is selected by the @cfg argument. The new voltage target is
|
|
* selected by the @new_target and the voltage is specified in mV. The
|
|
* new brownout value is selected by the @new_brownout argument and the
|
|
* value is also in mV.
|
|
*/
|
|
static void mxs_power_set_vddx(const struct mxs_vddx_cfg *cfg,
|
|
uint32_t new_target, uint32_t new_brownout)
|
|
{
|
|
struct mxs_power_regs *power_regs =
|
|
(struct mxs_power_regs *)MXS_POWER_BASE;
|
|
uint32_t cur_target, diff, bo_int = 0;
|
|
uint32_t powered_by_linreg = 0;
|
|
int adjust_up, tmp;
|
|
|
|
new_brownout = DIV_ROUND_CLOSEST(new_target - new_brownout,
|
|
cfg->step_mV);
|
|
|
|
cur_target = readl(cfg->reg);
|
|
cur_target &= cfg->trg_mask;
|
|
cur_target *= cfg->step_mV;
|
|
cur_target += cfg->lowest_mV;
|
|
|
|
adjust_up = new_target > cur_target;
|
|
if (cfg->powered_by_linreg)
|
|
powered_by_linreg = cfg->powered_by_linreg();
|
|
|
|
if (adjust_up && cfg->bo_irq) {
|
|
if (powered_by_linreg) {
|
|
bo_int = readl(cfg->reg);
|
|
clrbits_le32(cfg->reg, cfg->bo_enirq);
|
|
}
|
|
setbits_le32(cfg->reg, cfg->bo_offset_mask);
|
|
}
|
|
|
|
do {
|
|
if (abs(new_target - cur_target) > 100) {
|
|
if (adjust_up)
|
|
diff = cur_target + 100;
|
|
else
|
|
diff = cur_target - 100;
|
|
} else {
|
|
diff = new_target;
|
|
}
|
|
|
|
diff -= cfg->lowest_mV;
|
|
diff /= cfg->step_mV;
|
|
|
|
clrsetbits_le32(cfg->reg, cfg->trg_mask, diff);
|
|
|
|
if (powered_by_linreg ||
|
|
(readl(&power_regs->hw_power_sts) &
|
|
POWER_STS_VDD5V_GT_VDDIO))
|
|
early_delay(500);
|
|
else {
|
|
for (;;) {
|
|
tmp = readl(&power_regs->hw_power_sts);
|
|
if (tmp & POWER_STS_DC_OK)
|
|
break;
|
|
}
|
|
}
|
|
|
|
cur_target = readl(cfg->reg);
|
|
cur_target &= cfg->trg_mask;
|
|
cur_target *= cfg->step_mV;
|
|
cur_target += cfg->lowest_mV;
|
|
} while (new_target > cur_target);
|
|
|
|
if (cfg->bo_irq) {
|
|
if (adjust_up && powered_by_linreg) {
|
|
writel(cfg->bo_irq, &power_regs->hw_power_ctrl_clr);
|
|
if (bo_int & cfg->bo_enirq)
|
|
setbits_le32(cfg->reg, cfg->bo_enirq);
|
|
}
|
|
|
|
clrsetbits_le32(cfg->reg, cfg->bo_offset_mask,
|
|
new_brownout << cfg->bo_offset_offset);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* mxs_setup_batt_detect() - Start the battery voltage measurement logic
|
|
*
|
|
* This function starts and configures the LRADC block. This allows the
|
|
* power initialization code to measure battery voltage and based on this
|
|
* knowledge, decide whether to boot at all, boot from battery or boot
|
|
* from 5V input.
|
|
*/
|
|
static void mxs_setup_batt_detect(void)
|
|
{
|
|
debug("SPL: Starting battery voltage measurement logic\n");
|
|
|
|
mxs_lradc_init();
|
|
mxs_lradc_enable_batt_measurement();
|
|
early_delay(10);
|
|
}
|
|
|
|
/**
|
|
* mxs_ungate_power() - Ungate the POWER block
|
|
*
|
|
* This function ungates clock to the power block. In case the power block
|
|
* was still gated at this point, it will not be possible to configure the
|
|
* block and therefore the power initialization would fail. This function
|
|
* is only needed on i.MX233, on i.MX28 the power block is always ungated.
|
|
*/
|
|
static void mxs_ungate_power(void)
|
|
{
|
|
#ifdef CONFIG_MX23
|
|
struct mxs_power_regs *power_regs =
|
|
(struct mxs_power_regs *)MXS_POWER_BASE;
|
|
|
|
writel(POWER_CTRL_CLKGATE, &power_regs->hw_power_ctrl_clr);
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* mxs_power_init() - The power block init main function
|
|
*
|
|
* This function calls all the power block initialization functions in
|
|
* proper sequence to start the power block.
|
|
*/
|
|
void mxs_power_init(void)
|
|
{
|
|
struct mxs_power_regs *power_regs =
|
|
(struct mxs_power_regs *)MXS_POWER_BASE;
|
|
|
|
debug("SPL: Initialising Power Block\n");
|
|
|
|
mxs_ungate_power();
|
|
|
|
mxs_power_clock2xtal();
|
|
mxs_power_set_auto_restart();
|
|
mxs_power_set_linreg();
|
|
mxs_power_setup_5v_detect();
|
|
|
|
mxs_setup_batt_detect();
|
|
|
|
mxs_power_configure_power_source();
|
|
mxs_enable_output_rail_protection();
|
|
|
|
debug("SPL: Setting VDDIO to 3V3 (brownout @ 3v15)\n");
|
|
mxs_power_set_vddx(&mxs_vddio_cfg, 3300, 3150);
|
|
|
|
debug("SPL: Setting VDDD to 1V5 (brownout @ 1v315)\n");
|
|
mxs_power_set_vddx(&mxs_vddd_cfg, 1500, 1315);
|
|
#ifdef CONFIG_MX23
|
|
debug("SPL: Setting mx23 VDDMEM to 2V5 (brownout @ 1v7)\n");
|
|
mxs_power_set_vddx(&mxs_vddmem_cfg, 2500, 1700);
|
|
#endif
|
|
writel(POWER_CTRL_VDDD_BO_IRQ | POWER_CTRL_VDDA_BO_IRQ |
|
|
POWER_CTRL_VDDIO_BO_IRQ | POWER_CTRL_VDD5V_DROOP_IRQ |
|
|
POWER_CTRL_VBUS_VALID_IRQ | POWER_CTRL_BATT_BO_IRQ |
|
|
POWER_CTRL_DCDC4P2_BO_IRQ, &power_regs->hw_power_ctrl_clr);
|
|
|
|
writel(POWER_5VCTRL_PWDN_5VBRNOUT, &power_regs->hw_power_5vctrl_set);
|
|
|
|
early_delay(1000);
|
|
}
|
|
|
|
#ifdef CONFIG_SPL_MXS_PSWITCH_WAIT
|
|
/**
|
|
* mxs_power_wait_pswitch() - Wait for power switch to be pressed
|
|
*
|
|
* This function waits until the power-switch was pressed to start booting
|
|
* the board.
|
|
*/
|
|
void mxs_power_wait_pswitch(void)
|
|
{
|
|
struct mxs_power_regs *power_regs =
|
|
(struct mxs_power_regs *)MXS_POWER_BASE;
|
|
|
|
debug("SPL: Waiting for power switch input\n");
|
|
while (!(readl(&power_regs->hw_power_sts) & POWER_STS_PSWITCH_MASK))
|
|
;
|
|
}
|
|
#endif
|