123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494495496497498499500501502503504505506507508509510511512513514515516517518519520521522523524525526527528529530531532533534535536537538539540541542543544545546547548549550551552553554555556557558559560561562563564565566567568569570571572573574575576577578579580581582583584585586587588589590591592593594595596597598599600601602603604605606607608609610611612613614615616617618619620621622623624625626627628629630631632633634635636637638639640641642643644645646647648649650651652653654655656657658659660661662663664665666667668669670671672673674675676677678679680681682683684685686687688689690691692693694695696697698699700701702703704705706707708709710711712713714715716717718719720721722723724725726727728729730731732733734735736737738739740741742743744745746747748749750751752753754755756757758759760761762763764765766767768769770771772773774775776777778779780781782783784785786787788789790791792793794795796797798799800801802803804805806807808809810811812813814815816817818819820821822823824825826827828829830831832833834835836837838839840841842843844845846847848849850851852853854855856857858859860861862863864865866867868869870871872873874875876877878879880881882883884885886887888889890891892893894895896897898899900901902903904905906907908909910911912913914915916917918919920921922923924925926927928929930931932933934935936937938939940941942943944945946947948949950951952953954955956957958959960961962963964965966967968969970971972973974975976977978979980981982983984985986987988989990991992993994995996997998999100010011002100310041005100610071008100910101011101210131014101510161017101810191020102110221023102410251026102710281029103010311032103310341035103610371038103910401041104210431044104510461047104810491050105110521053105410551056105710581059106010611062106310641065106610671068106910701071107210731074107510761077107810791080108110821083108410851086108710881089109010911092109310941095109610971098109911001101110211031104110511061107110811091110111111121113111411151116111711181119112011211122112311241125112611271128112911301131113211331134113511361137113811391140114111421143114411451146114711481149115011511152115311541155115611571158115911601161116211631164116511661167116811691170117111721173117411751176117711781179118011811182118311841185118611871188118911901191119211931194119511961197119811991200120112021203120412051206120712081209121012111212121312141215121612171218121912201221122212231224122512261227122812291230123112321233123412351236123712381239124012411242124312441245124612471248124912501251125212531254125512561257125812591260126112621263126412651266126712681269127012711272127312741275127612771278127912801281128212831284128512861287128812891290 |
- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Freescale i.MX28 Boot PMIC init
- *
- * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
- * on behalf of DENX Software Engineering GmbH
- */
- #include <common.h>
- #include <config.h>
- #include <hang.h>
- #include <asm/io.h>
- #include <asm/arch/imx-regs.h>
- #include "mxs_init.h"
- #ifdef CONFIG_SYS_MXS_VDD5V_ONLY
- #define DCDC4P2_DROPOUT_CONFIG POWER_DCDC4P2_DROPOUT_CTRL_100MV | \
- POWER_DCDC4P2_DROPOUT_CTRL_SRC_4P2
- #else
- #define DCDC4P2_DROPOUT_CONFIG POWER_DCDC4P2_DROPOUT_CTRL_100MV | \
- POWER_DCDC4P2_DROPOUT_CTRL_SRC_SEL
- #endif
- /**
- * mxs_power_clock2xtal() - Switch CPU core clock source to 24MHz XTAL
- *
- * This function switches the CPU core clock from PLL to 24MHz XTAL
- * oscilator. This is necessary if the PLL is being reconfigured to
- * prevent crash of the CPU core.
- */
- static void mxs_power_clock2xtal(void)
- {
- struct mxs_clkctrl_regs *clkctrl_regs =
- (struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE;
- debug("SPL: Switching CPU clock to 24MHz XTAL\n");
- /* Set XTAL as CPU reference clock */
- writel(CLKCTRL_CLKSEQ_BYPASS_CPU,
- &clkctrl_regs->hw_clkctrl_clkseq_set);
- }
- /**
- * mxs_power_clock2pll() - Switch CPU core clock source to PLL
- *
- * This function switches the CPU core clock from 24MHz XTAL oscilator
- * to PLL. This can only be called once the PLL has re-locked and once
- * the PLL is stable after reconfiguration.
- */
- static void mxs_power_clock2pll(void)
- {
- struct mxs_clkctrl_regs *clkctrl_regs =
- (struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE;
- debug("SPL: Switching CPU core clock source to PLL\n");
- /*
- * TODO: Are we really? It looks like we turn on PLL0, but we then
- * set the CLKCTRL_CLKSEQ_BYPASS_CPU bit of the (which was already
- * set by mxs_power_clock2xtal()). Clearing this bit here seems to
- * introduce some instability (causing the CPU core to hang). Maybe
- * we aren't giving PLL0 enough time to stabilise?
- */
- setbits_le32(&clkctrl_regs->hw_clkctrl_pll0ctrl0,
- CLKCTRL_PLL0CTRL0_POWER);
- early_delay(100);
- /*
- * TODO: Should the PLL0 FORCE_LOCK bit be set here followed be a
- * wait on the PLL0 LOCK bit?
- */
- setbits_le32(&clkctrl_regs->hw_clkctrl_clkseq,
- CLKCTRL_CLKSEQ_BYPASS_CPU);
- }
- /**
- * mxs_power_set_auto_restart() - Set the auto-restart bit
- *
- * This function ungates the RTC block and sets the AUTO_RESTART
- * bit to work around a design bug on MX28EVK Rev. A .
- */
- static void mxs_power_set_auto_restart(void)
- {
- struct mxs_rtc_regs *rtc_regs =
- (struct mxs_rtc_regs *)MXS_RTC_BASE;
- debug("SPL: Setting auto-restart bit\n");
- writel(RTC_CTRL_SFTRST, &rtc_regs->hw_rtc_ctrl_clr);
- while (readl(&rtc_regs->hw_rtc_ctrl) & RTC_CTRL_SFTRST)
- ;
- writel(RTC_CTRL_CLKGATE, &rtc_regs->hw_rtc_ctrl_clr);
- while (readl(&rtc_regs->hw_rtc_ctrl) & RTC_CTRL_CLKGATE)
- ;
- /* Do nothing if flag already set */
- if (readl(&rtc_regs->hw_rtc_persistent0) & RTC_PERSISTENT0_AUTO_RESTART)
- return;
- while (readl(&rtc_regs->hw_rtc_stat) & RTC_STAT_NEW_REGS_MASK)
- ;
- setbits_le32(&rtc_regs->hw_rtc_persistent0,
- RTC_PERSISTENT0_AUTO_RESTART);
- writel(RTC_CTRL_FORCE_UPDATE, &rtc_regs->hw_rtc_ctrl_set);
- writel(RTC_CTRL_FORCE_UPDATE, &rtc_regs->hw_rtc_ctrl_clr);
- while (readl(&rtc_regs->hw_rtc_stat) & RTC_STAT_NEW_REGS_MASK)
- ;
- while (readl(&rtc_regs->hw_rtc_stat) & RTC_STAT_STALE_REGS_MASK)
- ;
- }
- /**
- * mxs_power_set_linreg() - Set linear regulators 25mV below DC-DC converter
- *
- * This function configures the VDDIO, VDDA and VDDD linear regulators output
- * to be 25mV below the VDDIO, VDDA and VDDD output from the DC-DC switching
- * converter. This is the recommended setting for the case where we use both
- * linear regulators and DC-DC converter to power the VDDIO rail.
- */
- static void mxs_power_set_linreg(void)
- {
- struct mxs_power_regs *power_regs =
- (struct mxs_power_regs *)MXS_POWER_BASE;
- /* Set linear regulator 25mV below switching converter */
- debug("SPL: Setting VDDD 25mV below DC-DC converters\n");
- clrsetbits_le32(&power_regs->hw_power_vdddctrl,
- POWER_VDDDCTRL_LINREG_OFFSET_MASK,
- POWER_VDDDCTRL_LINREG_OFFSET_1STEPS_BELOW);
- debug("SPL: Setting VDDA 25mV below DC-DC converters\n");
- clrsetbits_le32(&power_regs->hw_power_vddactrl,
- POWER_VDDACTRL_LINREG_OFFSET_MASK,
- POWER_VDDACTRL_LINREG_OFFSET_1STEPS_BELOW);
- debug("SPL: Setting VDDIO 25mV below DC-DC converters\n");
- clrsetbits_le32(&power_regs->hw_power_vddioctrl,
- POWER_VDDIOCTRL_LINREG_OFFSET_MASK,
- POWER_VDDIOCTRL_LINREG_OFFSET_1STEPS_BELOW);
- }
- /**
- * mxs_get_batt_volt() - Measure battery input voltage
- *
- * This function retrieves the battery input voltage and returns it.
- */
- static int mxs_get_batt_volt(void)
- {
- struct mxs_power_regs *power_regs =
- (struct mxs_power_regs *)MXS_POWER_BASE;
- uint32_t volt = readl(&power_regs->hw_power_battmonitor);
- volt &= POWER_BATTMONITOR_BATT_VAL_MASK;
- volt >>= POWER_BATTMONITOR_BATT_VAL_OFFSET;
- volt *= 8;
- debug("SPL: Battery Voltage = %dmV\n", volt);
- return volt;
- }
- /**
- * mxs_is_batt_ready() - Test if the battery provides enough voltage to boot
- *
- * This function checks if the battery input voltage is higher than 3.6V and
- * therefore allows the system to successfully boot using this power source.
- */
- static int mxs_is_batt_ready(void)
- {
- return (mxs_get_batt_volt() >= 3600);
- }
- /**
- * mxs_is_batt_good() - Test if battery is operational at all
- *
- * This function starts recharging the battery and tests if the input current
- * provided by the 5V input recharging the battery is also sufficient to power
- * the DC-DC converter.
- */
- static int mxs_is_batt_good(void)
- {
- struct mxs_power_regs *power_regs =
- (struct mxs_power_regs *)MXS_POWER_BASE;
- uint32_t volt = mxs_get_batt_volt();
- if ((volt >= 2400) && (volt <= 4300)) {
- debug("SPL: Battery is good\n");
- return 1;
- }
- clrsetbits_le32(&power_regs->hw_power_5vctrl,
- POWER_5VCTRL_CHARGE_4P2_ILIMIT_MASK,
- 0x3 << POWER_5VCTRL_CHARGE_4P2_ILIMIT_OFFSET);
- writel(POWER_5VCTRL_PWD_CHARGE_4P2_MASK,
- &power_regs->hw_power_5vctrl_clr);
- clrsetbits_le32(&power_regs->hw_power_charge,
- POWER_CHARGE_STOP_ILIMIT_MASK | POWER_CHARGE_BATTCHRG_I_MASK,
- POWER_CHARGE_STOP_ILIMIT_10MA | 0x3);
- writel(POWER_CHARGE_PWD_BATTCHRG, &power_regs->hw_power_charge_clr);
- writel(POWER_5VCTRL_PWD_CHARGE_4P2_MASK,
- &power_regs->hw_power_5vctrl_clr);
- early_delay(500000);
- volt = mxs_get_batt_volt();
- if (volt >= 3500) {
- debug("SPL: Battery Voltage too high\n");
- return 0;
- }
- if (volt >= 2400) {
- debug("SPL: Battery is good\n");
- return 1;
- }
- writel(POWER_CHARGE_STOP_ILIMIT_MASK | POWER_CHARGE_BATTCHRG_I_MASK,
- &power_regs->hw_power_charge_clr);
- writel(POWER_CHARGE_PWD_BATTCHRG, &power_regs->hw_power_charge_set);
- debug("SPL: Battery Voltage too low\n");
- return 0;
- }
- /**
- * mxs_power_setup_5v_detect() - Start the 5V input detection comparator
- *
- * This function enables the 5V detection comparator and sets the 5V valid
- * threshold to 4.4V . We use 4.4V threshold here to make sure that even
- * under high load, the voltage drop on the 5V input won't be so critical
- * to cause undervolt on the 4P2 linear regulator supplying the DC-DC
- * converter and thus making the system crash.
- */
- static void mxs_power_setup_5v_detect(void)
- {
- struct mxs_power_regs *power_regs =
- (struct mxs_power_regs *)MXS_POWER_BASE;
- /* Start 5V detection */
- debug("SPL: Starting 5V input detection comparator\n");
- clrsetbits_le32(&power_regs->hw_power_5vctrl,
- POWER_5VCTRL_VBUSVALID_TRSH_MASK,
- POWER_5VCTRL_VBUSVALID_TRSH_4V4 |
- POWER_5VCTRL_PWRUP_VBUS_CMPS);
- }
- /**
- * mxs_power_switch_dcdc_clocksource() - Switch PLL clock for DC-DC converters
- * @freqsel: One of the POWER_MISC_FREQSEL_xxx defines to select the clock
- *
- * This function configures and then enables an alternative PLL clock source
- * for the DC-DC converters.
- */
- void mxs_power_switch_dcdc_clocksource(uint32_t freqsel)
- {
- struct mxs_power_regs *power_regs =
- (struct mxs_power_regs *)MXS_POWER_BASE;
- /* Select clocksource for DC-DC converters */
- clrsetbits_le32(&power_regs->hw_power_misc,
- POWER_MISC_FREQSEL_MASK,
- freqsel);
- setbits_le32(&power_regs->hw_power_misc,
- POWER_MISC_SEL_PLLCLK);
- }
- /**
- * mxs_power_setup_dcdc_clocksource() - Setup PLL clock source for DC-DC converters
- *
- * Normally, there is no need to switch DC-DC clocksource. This is the reason,
- * why this function is a stub and does nothing. However, boards can implement
- * this function when required and call mxs_power_switch_dcdc_clocksource() to
- * switch to an alternative clock source.
- */
- __weak void mxs_power_setup_dcdc_clocksource(void)
- {
- debug("SPL: Using default DC-DC clocksource\n");
- }
- /**
- * mxs_src_power_init() - Preconfigure the power block
- *
- * This function configures reasonable values for the DC-DC control loop
- * and battery monitor.
- */
- static void mxs_src_power_init(void)
- {
- struct mxs_power_regs *power_regs =
- (struct mxs_power_regs *)MXS_POWER_BASE;
- debug("SPL: Pre-Configuring power block\n");
- /* Improve efficieny and reduce transient ripple */
- writel(POWER_LOOPCTRL_TOGGLE_DIF | POWER_LOOPCTRL_EN_CM_HYST |
- POWER_LOOPCTRL_EN_DF_HYST, &power_regs->hw_power_loopctrl_set);
- clrsetbits_le32(&power_regs->hw_power_dclimits,
- POWER_DCLIMITS_POSLIMIT_BUCK_MASK,
- 0x30 << POWER_DCLIMITS_POSLIMIT_BUCK_OFFSET);
- setbits_le32(&power_regs->hw_power_battmonitor,
- POWER_BATTMONITOR_EN_BATADJ);
- /* Increase the RCSCALE level for quick DCDC response to dynamic load */
- clrsetbits_le32(&power_regs->hw_power_loopctrl,
- POWER_LOOPCTRL_EN_RCSCALE_MASK,
- POWER_LOOPCTRL_RCSCALE_THRESH |
- POWER_LOOPCTRL_EN_RCSCALE_8X);
- clrsetbits_le32(&power_regs->hw_power_minpwr,
- POWER_MINPWR_HALFFETS, POWER_MINPWR_DOUBLE_FETS);
- /* 5V to battery handoff ... FIXME */
- 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);
- }
- /**
- * mxs_power_init_4p2_params() - Configure the parameters of the 4P2 regulator
- *
- * This function configures the necessary parameters for the 4P2 linear
- * regulator to supply the DC-DC converter from 5V input.
- */
- static void mxs_power_init_4p2_params(void)
- {
- struct mxs_power_regs *power_regs =
- (struct mxs_power_regs *)MXS_POWER_BASE;
- debug("SPL: Configuring common 4P2 regulator params\n");
- /* Setup 4P2 parameters */
- clrsetbits_le32(&power_regs->hw_power_dcdc4p2,
- POWER_DCDC4P2_CMPTRIP_MASK | POWER_DCDC4P2_TRG_MASK,
- POWER_DCDC4P2_TRG_4V2 | (31 << POWER_DCDC4P2_CMPTRIP_OFFSET));
- clrsetbits_le32(&power_regs->hw_power_5vctrl,
- POWER_5VCTRL_HEADROOM_ADJ_MASK,
- 0x4 << POWER_5VCTRL_HEADROOM_ADJ_OFFSET);
- clrsetbits_le32(&power_regs->hw_power_dcdc4p2,
- POWER_DCDC4P2_DROPOUT_CTRL_MASK,
- DCDC4P2_DROPOUT_CONFIG);
- clrsetbits_le32(&power_regs->hw_power_5vctrl,
- POWER_5VCTRL_CHARGE_4P2_ILIMIT_MASK,
- 0x3f << POWER_5VCTRL_CHARGE_4P2_ILIMIT_OFFSET);
- }
- /**
- * mxs_enable_4p2_dcdc_input() - Enable or disable the DCDC input from 4P2
- * @xfer: Select if the input shall be enabled or disabled
- *
- * This function enables or disables the 4P2 input into the DC-DC converter.
- */
- static void mxs_enable_4p2_dcdc_input(int xfer)
- {
- struct mxs_power_regs *power_regs =
- (struct mxs_power_regs *)MXS_POWER_BASE;
- uint32_t tmp, vbus_thresh, vbus_5vdetect, pwd_bo;
- uint32_t prev_5v_brnout, prev_5v_droop;
- debug("SPL: %s 4P2 DC-DC Input\n", xfer ? "Enabling" : "Disabling");
- if (xfer && (readl(&power_regs->hw_power_5vctrl) &
- POWER_5VCTRL_ENABLE_DCDC)) {
- return;
- }
- prev_5v_brnout = readl(&power_regs->hw_power_5vctrl) &
- POWER_5VCTRL_PWDN_5VBRNOUT;
- prev_5v_droop = readl(&power_regs->hw_power_ctrl) &
- POWER_CTRL_ENIRQ_VDD5V_DROOP;
- clrbits_le32(&power_regs->hw_power_5vctrl, POWER_5VCTRL_PWDN_5VBRNOUT);
- writel(POWER_RESET_UNLOCK_KEY | POWER_RESET_PWD_OFF,
- &power_regs->hw_power_reset);
- clrbits_le32(&power_regs->hw_power_ctrl, POWER_CTRL_ENIRQ_VDD5V_DROOP);
- /*
- * Recording orignal values that will be modified temporarlily
- * to handle a chip bug. See chip errata for CQ ENGR00115837
- */
- tmp = readl(&power_regs->hw_power_5vctrl);
- vbus_thresh = tmp & POWER_5VCTRL_VBUSVALID_TRSH_MASK;
- vbus_5vdetect = tmp & POWER_5VCTRL_VBUSVALID_5VDETECT;
- pwd_bo = readl(&power_regs->hw_power_minpwr) & POWER_MINPWR_PWD_BO;
- /*
- * Disable mechanisms that get erroneously tripped by when setting
- * the DCDC4P2 EN_DCDC
- */
- clrbits_le32(&power_regs->hw_power_5vctrl,
- POWER_5VCTRL_VBUSVALID_5VDETECT |
- POWER_5VCTRL_VBUSVALID_TRSH_MASK);
- writel(POWER_MINPWR_PWD_BO, &power_regs->hw_power_minpwr_set);
- if (xfer) {
- setbits_le32(&power_regs->hw_power_5vctrl,
- POWER_5VCTRL_DCDC_XFER);
- early_delay(20);
- clrbits_le32(&power_regs->hw_power_5vctrl,
- POWER_5VCTRL_DCDC_XFER);
- setbits_le32(&power_regs->hw_power_5vctrl,
- POWER_5VCTRL_ENABLE_DCDC);
- } else {
- setbits_le32(&power_regs->hw_power_dcdc4p2,
- POWER_DCDC4P2_ENABLE_DCDC);
- }
- early_delay(25);
- clrsetbits_le32(&power_regs->hw_power_5vctrl,
- POWER_5VCTRL_VBUSVALID_TRSH_MASK, vbus_thresh);
- if (vbus_5vdetect)
- 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 1V55 (brownout @ 1v400)\n");
- mxs_power_set_vddx(&mxs_vddd_cfg, 1550, 1400);
- #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
|