12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182838485868788899091929394959697989910010110210310410510610710810911011111211311411511611711811912012112212312412512612712812913013113213313413513613713813914014114214314414514614714814915015115215315415515615715815916016116216316416516616716816917017117217317417517617717817918018118218318418518618718818919019119219319419519619719819920020120220320420520620720820921021121221321421521621721821922022122222322422522622722822923023123223323423523623723823924024124224324424524624724824925025125225325425525625725825926026126226326426526626726826927027127227327427527627727827928028128228328428528628728828929029129229329429529629729829930030130230330430530630730830931031131231331431531631731831932032132232332432532632732832933033133233333433533633733833934034134234334434534634734834935035135235335435535635735835936036136236336436536636736836937037137237337437537637737837938038138238338438538638738838939039139239339439539639739839940040140240340440540640740840941041141241341441541641741841942042142242342442542642742842943043143243343443543643743843944044144244344444544644744844945045145245345445545645745845946046146246346446546646746846947047147247347447547647747847948048148248348448548648748848949049149249349449549649749849950050150250350450550650750850951051151251351451551651751851952052152252352452552652752852953053153253353453553653753853954054154254354454554654754854955055155255355455555655755855956056156256356456556656756856957057157257357457557657757857958058158258358458558658758858959059159259359459559659759859960060160260360460560660760860961061161261361461561661761861962062162262362462562662762862963063163263363463563663763863964064164264364464564664764864965065165265365465565665765865966066166266366466566666766866967067167267367467567667767867968068168268368468568668768868969069169269369469569669769869970070170270370470570670770870971071171271371471571671771871972072172272372472572672772872973073173273373473573673773873974074174274374474574674774874975075175275375475575675775875976076176276376476576676776876977077177277377477577677777877978078178278378478578678778878979079179279379479579679779879980080180280380480580680780880981081181281381481581681781881982082182282382482582682782882983083183283383483583683783883984084184284384484584684784884985085185285385485585685785885986086186286386486586686786886987087187287387487587687787887988088188288388488588688788888989089189289389489589689789889990090190290390490590690790890991091191291391491591691791891992092192292392492592692792892993093193293393493593693793893994094194294394494594694794894995095195295395495595695795895996096196296396496596696796896997097197297397497597697797897998098198298398498598698798898999099199299399499599699799899910001001100210031004100510061007100810091010101110121013101410151016101710181019102010211022102310241025102610271028102910301031103210331034103510361037103810391040104110421043104410451046104710481049105010511052105310541055105610571058105910601061106210631064106510661067106810691070107110721073107410751076107710781079108010811082108310841085108610871088108910901091109210931094109510961097109810991100110111021103110411051106110711081109111011111112111311141115111611171118111911201121112211231124112511261127112811291130113111321133113411351136113711381139114011411142114311441145114611471148114911501151115211531154115511561157115811591160116111621163116411651166116711681169117011711172117311741175117611771178117911801181118211831184118511861187118811891190119111921193119411951196119711981199120012011202120312041205120612071208120912101211121212131214121512161217121812191220122112221223122412251226122712281229123012311232123312341235123612371238123912401241124212431244124512461247124812491250125112521253125412551256125712581259126012611262126312641265126612671268126912701271127212731274127512761277127812791280128112821283128412851286128712881289129012911292129312941295129612971298129913001301130213031304130513061307130813091310131113121313131413151316131713181319132013211322132313241325132613271328132913301331133213331334133513361337133813391340134113421343134413451346134713481349135013511352135313541355135613571358135913601361136213631364136513661367136813691370137113721373137413751376137713781379138013811382138313841385138613871388138913901391139213931394139513961397139813991400140114021403140414051406140714081409141014111412141314141415141614171418141914201421142214231424142514261427142814291430143114321433143414351436143714381439144014411442144314441445144614471448144914501451145214531454145514561457145814591460146114621463146414651466146714681469147014711472147314741475147614771478147914801481148214831484148514861487148814891490149114921493149414951496149714981499150015011502150315041505150615071508150915101511151215131514151515161517151815191520152115221523152415251526152715281529153015311532153315341535153615371538153915401541154215431544154515461547154815491550155115521553155415551556155715581559156015611562156315641565156615671568156915701571157215731574157515761577157815791580158115821583158415851586158715881589159015911592159315941595159615971598159916001601160216031604160516061607160816091610161116121613161416151616161716181619162016211622162316241625162616271628162916301631163216331634163516361637163816391640164116421643164416451646164716481649165016511652165316541655165616571658165916601661166216631664166516661667166816691670167116721673167416751676167716781679168016811682168316841685168616871688168916901691169216931694169516961697169816991700170117021703170417051706170717081709171017111712171317141715171617171718171917201721172217231724172517261727172817291730173117321733173417351736173717381739174017411742174317441745174617471748174917501751175217531754175517561757175817591760176117621763176417651766176717681769177017711772177317741775177617771778177917801781178217831784178517861787178817891790179117921793179417951796179717981799180018011802180318041805180618071808180918101811181218131814181518161817181818191820182118221823182418251826182718281829183018311832183318341835183618371838183918401841184218431844184518461847184818491850185118521853185418551856185718581859186018611862186318641865186618671868186918701871187218731874187518761877187818791880188118821883188418851886188718881889189018911892189318941895189618971898189919001901190219031904190519061907190819091910191119121913191419151916191719181919192019211922192319241925192619271928192919301931193219331934193519361937193819391940194119421943194419451946194719481949195019511952195319541955195619571958195919601961196219631964196519661967196819691970197119721973197419751976197719781979198019811982198319841985198619871988198919901991199219931994199519961997199819992000200120022003200420052006200720082009201020112012201320142015201620172018201920202021202220232024202520262027202820292030203120322033203420352036203720382039204020412042204320442045204620472048204920502051205220532054205520562057205820592060206120622063206420652066206720682069207020712072207320742075207620772078207920802081208220832084208520862087208820892090209120922093209420952096209720982099210021012102210321042105210621072108210921102111211221132114211521162117211821192120212121222123212421252126212721282129213021312132213321342135213621372138213921402141214221432144214521462147214821492150215121522153215421552156215721582159216021612162216321642165216621672168216921702171217221732174217521762177217821792180218121822183218421852186218721882189219021912192219321942195219621972198219922002201220222032204220522062207220822092210221122122213221422152216221722182219222022212222222322242225222622272228222922302231223222332234223522362237223822392240224122422243224422452246224722482249225022512252225322542255225622572258225922602261226222632264226522662267226822692270227122722273227422752276227722782279228022812282228322842285228622872288228922902291229222932294229522962297229822992300230123022303230423052306230723082309231023112312231323142315231623172318231923202321232223232324232523262327232823292330233123322333233423352336233723382339234023412342234323442345234623472348234923502351235223532354235523562357235823592360236123622363236423652366236723682369237023712372237323742375237623772378237923802381238223832384238523862387238823892390239123922393239423952396239723982399240024012402240324042405240624072408240924102411241224132414241524162417241824192420242124222423242424252426242724282429243024312432243324342435243624372438243924402441244224432444244524462447244824492450245124522453245424552456245724582459246024612462246324642465246624672468246924702471247224732474247524762477247824792480248124822483248424852486248724882489249024912492249324942495249624972498249925002501250225032504250525062507250825092510251125122513251425152516251725182519252025212522252325242525252625272528252925302531253225332534253525362537253825392540254125422543254425452546254725482549255025512552255325542555255625572558255925602561256225632564256525662567256825692570257125722573257425752576257725782579258025812582258325842585258625872588258925902591259225932594259525962597259825992600260126022603260426052606260726082609261026112612261326142615261626172618261926202621262226232624262526262627262826292630263126322633263426352636263726382639264026412642264326442645264626472648264926502651265226532654265526562657265826592660266126622663266426652666266726682669267026712672267326742675267626772678267926802681268226832684268526862687268826892690269126922693269426952696269726982699270027012702270327042705270627072708270927102711271227132714271527162717271827192720272127222723272427252726272727282729273027312732273327342735273627372738273927402741274227432744274527462747274827492750275127522753275427552756275727582759276027612762276327642765276627672768276927702771277227732774277527762777277827792780278127822783278427852786278727882789279027912792279327942795279627972798279928002801280228032804280528062807280828092810281128122813281428152816281728182819282028212822282328242825282628272828282928302831283228332834283528362837283828392840284128422843284428452846284728482849285028512852285328542855285628572858285928602861286228632864286528662867286828692870287128722873287428752876287728782879288028812882288328842885288628872888288928902891289228932894289528962897289828992900290129022903290429052906290729082909291029112912291329142915291629172918291929202921292229232924292529262927292829292930293129322933293429352936293729382939294029412942294329442945294629472948294929502951295229532954295529562957295829592960296129622963296429652966296729682969297029712972297329742975297629772978297929802981298229832984298529862987298829892990299129922993299429952996299729982999300030013002300330043005300630073008300930103011301230133014301530163017301830193020302130223023302430253026302730283029303030313032303330343035303630373038303930403041304230433044304530463047304830493050305130523053305430553056305730583059306030613062306330643065306630673068306930703071307230733074307530763077307830793080308130823083 |
- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * Generic OPP Interface
- *
- * Copyright (C) 2009-2010 Texas Instruments Incorporated.
- * Nishanth Menon
- * Romit Dasgupta
- * Kevin Hilman
- */
- #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
- #include <linux/clk.h>
- #include <linux/errno.h>
- #include <linux/err.h>
- #include <linux/device.h>
- #include <linux/export.h>
- #include <linux/pm_domain.h>
- #include <linux/regulator/consumer.h>
- #include <linux/slab.h>
- #include <linux/xarray.h>
- #include "opp.h"
- /*
- * The root of the list of all opp-tables. All opp_table structures branch off
- * from here, with each opp_table containing the list of opps it supports in
- * various states of availability.
- */
- LIST_HEAD(opp_tables);
- /* OPP tables with uninitialized required OPPs */
- LIST_HEAD(lazy_opp_tables);
- /* Lock to allow exclusive modification to the device and opp lists */
- DEFINE_MUTEX(opp_table_lock);
- /* Flag indicating that opp_tables list is being updated at the moment */
- static bool opp_tables_busy;
- /* OPP ID allocator */
- static DEFINE_XARRAY_ALLOC1(opp_configs);
- static bool _find_opp_dev(const struct device *dev, struct opp_table *opp_table)
- {
- struct opp_device *opp_dev;
- bool found = false;
- mutex_lock(&opp_table->lock);
- list_for_each_entry(opp_dev, &opp_table->dev_list, node)
- if (opp_dev->dev == dev) {
- found = true;
- break;
- }
- mutex_unlock(&opp_table->lock);
- return found;
- }
- static struct opp_table *_find_opp_table_unlocked(struct device *dev)
- {
- struct opp_table *opp_table;
- list_for_each_entry(opp_table, &opp_tables, node) {
- if (_find_opp_dev(dev, opp_table)) {
- _get_opp_table_kref(opp_table);
- return opp_table;
- }
- }
- return ERR_PTR(-ENODEV);
- }
- /**
- * _find_opp_table() - find opp_table struct using device pointer
- * @dev: device pointer used to lookup OPP table
- *
- * Search OPP table for one containing matching device.
- *
- * Return: pointer to 'struct opp_table' if found, otherwise -ENODEV or
- * -EINVAL based on type of error.
- *
- * The callers must call dev_pm_opp_put_opp_table() after the table is used.
- */
- struct opp_table *_find_opp_table(struct device *dev)
- {
- struct opp_table *opp_table;
- if (IS_ERR_OR_NULL(dev)) {
- pr_err("%s: Invalid parameters\n", __func__);
- return ERR_PTR(-EINVAL);
- }
- mutex_lock(&opp_table_lock);
- opp_table = _find_opp_table_unlocked(dev);
- mutex_unlock(&opp_table_lock);
- return opp_table;
- }
- /*
- * Returns true if multiple clocks aren't there, else returns false with WARN.
- *
- * We don't force clk_count == 1 here as there are users who don't have a clock
- * representation in the OPP table and manage the clock configuration themselves
- * in an platform specific way.
- */
- static bool assert_single_clk(struct opp_table *opp_table)
- {
- return !WARN_ON(opp_table->clk_count > 1);
- }
- /**
- * dev_pm_opp_get_voltage() - Gets the voltage corresponding to an opp
- * @opp: opp for which voltage has to be returned for
- *
- * Return: voltage in micro volt corresponding to the opp, else
- * return 0
- *
- * This is useful only for devices with single power supply.
- */
- unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp)
- {
- if (IS_ERR_OR_NULL(opp)) {
- pr_err("%s: Invalid parameters\n", __func__);
- return 0;
- }
- return opp->supplies[0].u_volt;
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_get_voltage);
- /**
- * dev_pm_opp_get_supplies() - Gets the supply information corresponding to an opp
- * @opp: opp for which voltage has to be returned for
- * @supplies: Placeholder for copying the supply information.
- *
- * Return: negative error number on failure, 0 otherwise on success after
- * setting @supplies.
- *
- * This can be used for devices with any number of power supplies. The caller
- * must ensure the @supplies array must contain space for each regulator.
- */
- int dev_pm_opp_get_supplies(struct dev_pm_opp *opp,
- struct dev_pm_opp_supply *supplies)
- {
- if (IS_ERR_OR_NULL(opp) || !supplies) {
- pr_err("%s: Invalid parameters\n", __func__);
- return -EINVAL;
- }
- memcpy(supplies, opp->supplies,
- sizeof(*supplies) * opp->opp_table->regulator_count);
- return 0;
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_get_supplies);
- /**
- * dev_pm_opp_get_power() - Gets the power corresponding to an opp
- * @opp: opp for which power has to be returned for
- *
- * Return: power in micro watt corresponding to the opp, else
- * return 0
- *
- * This is useful only for devices with single power supply.
- */
- unsigned long dev_pm_opp_get_power(struct dev_pm_opp *opp)
- {
- unsigned long opp_power = 0;
- int i;
- if (IS_ERR_OR_NULL(opp)) {
- pr_err("%s: Invalid parameters\n", __func__);
- return 0;
- }
- for (i = 0; i < opp->opp_table->regulator_count; i++)
- opp_power += opp->supplies[i].u_watt;
- return opp_power;
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_get_power);
- /**
- * dev_pm_opp_get_freq() - Gets the frequency corresponding to an available opp
- * @opp: opp for which frequency has to be returned for
- *
- * Return: frequency in hertz corresponding to the opp, else
- * return 0
- */
- unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp)
- {
- if (IS_ERR_OR_NULL(opp)) {
- pr_err("%s: Invalid parameters\n", __func__);
- return 0;
- }
- if (!assert_single_clk(opp->opp_table))
- return 0;
- return opp->rates[0];
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_get_freq);
- /**
- * dev_pm_opp_get_level() - Gets the level corresponding to an available opp
- * @opp: opp for which level value has to be returned for
- *
- * Return: level read from device tree corresponding to the opp, else
- * return 0.
- */
- unsigned int dev_pm_opp_get_level(struct dev_pm_opp *opp)
- {
- if (IS_ERR_OR_NULL(opp) || !opp->available) {
- pr_err("%s: Invalid parameters\n", __func__);
- return 0;
- }
- return opp->level;
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_get_level);
- /**
- * dev_pm_opp_get_required_pstate() - Gets the required performance state
- * corresponding to an available opp
- * @opp: opp for which performance state has to be returned for
- * @index: index of the required opp
- *
- * Return: performance state read from device tree corresponding to the
- * required opp, else return 0.
- */
- unsigned int dev_pm_opp_get_required_pstate(struct dev_pm_opp *opp,
- unsigned int index)
- {
- if (IS_ERR_OR_NULL(opp) || !opp->available ||
- index >= opp->opp_table->required_opp_count) {
- pr_err("%s: Invalid parameters\n", __func__);
- return 0;
- }
- /* required-opps not fully initialized yet */
- if (lazy_linking_pending(opp->opp_table))
- return 0;
- return opp->required_opps[index]->pstate;
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_get_required_pstate);
- /**
- * dev_pm_opp_is_turbo() - Returns if opp is turbo OPP or not
- * @opp: opp for which turbo mode is being verified
- *
- * Turbo OPPs are not for normal use, and can be enabled (under certain
- * conditions) for short duration of times to finish high throughput work
- * quickly. Running on them for longer times may overheat the chip.
- *
- * Return: true if opp is turbo opp, else false.
- */
- bool dev_pm_opp_is_turbo(struct dev_pm_opp *opp)
- {
- if (IS_ERR_OR_NULL(opp) || !opp->available) {
- pr_err("%s: Invalid parameters\n", __func__);
- return false;
- }
- return opp->turbo;
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_is_turbo);
- /**
- * dev_pm_opp_get_max_clock_latency() - Get max clock latency in nanoseconds
- * @dev: device for which we do this operation
- *
- * Return: This function returns the max clock latency in nanoseconds.
- */
- unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev)
- {
- struct opp_table *opp_table;
- unsigned long clock_latency_ns;
- opp_table = _find_opp_table(dev);
- if (IS_ERR(opp_table))
- return 0;
- clock_latency_ns = opp_table->clock_latency_ns_max;
- dev_pm_opp_put_opp_table(opp_table);
- return clock_latency_ns;
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_clock_latency);
- /**
- * dev_pm_opp_get_max_volt_latency() - Get max voltage latency in nanoseconds
- * @dev: device for which we do this operation
- *
- * Return: This function returns the max voltage latency in nanoseconds.
- */
- unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev)
- {
- struct opp_table *opp_table;
- struct dev_pm_opp *opp;
- struct regulator *reg;
- unsigned long latency_ns = 0;
- int ret, i, count;
- struct {
- unsigned long min;
- unsigned long max;
- } *uV;
- opp_table = _find_opp_table(dev);
- if (IS_ERR(opp_table))
- return 0;
- /* Regulator may not be required for the device */
- if (!opp_table->regulators)
- goto put_opp_table;
- count = opp_table->regulator_count;
- uV = kmalloc_array(count, sizeof(*uV), GFP_KERNEL);
- if (!uV)
- goto put_opp_table;
- mutex_lock(&opp_table->lock);
- for (i = 0; i < count; i++) {
- uV[i].min = ~0;
- uV[i].max = 0;
- list_for_each_entry(opp, &opp_table->opp_list, node) {
- if (!opp->available)
- continue;
- if (opp->supplies[i].u_volt_min < uV[i].min)
- uV[i].min = opp->supplies[i].u_volt_min;
- if (opp->supplies[i].u_volt_max > uV[i].max)
- uV[i].max = opp->supplies[i].u_volt_max;
- }
- }
- mutex_unlock(&opp_table->lock);
- /*
- * The caller needs to ensure that opp_table (and hence the regulator)
- * isn't freed, while we are executing this routine.
- */
- for (i = 0; i < count; i++) {
- reg = opp_table->regulators[i];
- ret = regulator_set_voltage_time(reg, uV[i].min, uV[i].max);
- if (ret > 0)
- latency_ns += ret * 1000;
- }
- kfree(uV);
- put_opp_table:
- dev_pm_opp_put_opp_table(opp_table);
- return latency_ns;
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_volt_latency);
- /**
- * dev_pm_opp_get_max_transition_latency() - Get max transition latency in
- * nanoseconds
- * @dev: device for which we do this operation
- *
- * Return: This function returns the max transition latency, in nanoseconds, to
- * switch from one OPP to other.
- */
- unsigned long dev_pm_opp_get_max_transition_latency(struct device *dev)
- {
- return dev_pm_opp_get_max_volt_latency(dev) +
- dev_pm_opp_get_max_clock_latency(dev);
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_transition_latency);
- /**
- * dev_pm_opp_get_suspend_opp_freq() - Get frequency of suspend opp in Hz
- * @dev: device for which we do this operation
- *
- * Return: This function returns the frequency of the OPP marked as suspend_opp
- * if one is available, else returns 0;
- */
- unsigned long dev_pm_opp_get_suspend_opp_freq(struct device *dev)
- {
- struct opp_table *opp_table;
- unsigned long freq = 0;
- opp_table = _find_opp_table(dev);
- if (IS_ERR(opp_table))
- return 0;
- if (opp_table->suspend_opp && opp_table->suspend_opp->available)
- freq = dev_pm_opp_get_freq(opp_table->suspend_opp);
- dev_pm_opp_put_opp_table(opp_table);
- return freq;
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_get_suspend_opp_freq);
- int _get_opp_count(struct opp_table *opp_table)
- {
- struct dev_pm_opp *opp;
- int count = 0;
- mutex_lock(&opp_table->lock);
- list_for_each_entry(opp, &opp_table->opp_list, node) {
- if (opp->available)
- count++;
- }
- mutex_unlock(&opp_table->lock);
- return count;
- }
- /**
- * dev_pm_opp_get_opp_count() - Get number of opps available in the opp table
- * @dev: device for which we do this operation
- *
- * Return: This function returns the number of available opps if there are any,
- * else returns 0 if none or the corresponding error value.
- */
- int dev_pm_opp_get_opp_count(struct device *dev)
- {
- struct opp_table *opp_table;
- int count;
- opp_table = _find_opp_table(dev);
- if (IS_ERR(opp_table)) {
- count = PTR_ERR(opp_table);
- dev_dbg(dev, "%s: OPP table not found (%d)\n",
- __func__, count);
- return count;
- }
- count = _get_opp_count(opp_table);
- dev_pm_opp_put_opp_table(opp_table);
- return count;
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_get_opp_count);
- /* Helpers to read keys */
- static unsigned long _read_freq(struct dev_pm_opp *opp, int index)
- {
- return opp->rates[0];
- }
- static unsigned long _read_level(struct dev_pm_opp *opp, int index)
- {
- return opp->level;
- }
- static unsigned long _read_bw(struct dev_pm_opp *opp, int index)
- {
- return opp->bandwidth[index].peak;
- }
- /* Generic comparison helpers */
- static bool _compare_exact(struct dev_pm_opp **opp, struct dev_pm_opp *temp_opp,
- unsigned long opp_key, unsigned long key)
- {
- if (opp_key == key) {
- *opp = temp_opp;
- return true;
- }
- return false;
- }
- static bool _compare_ceil(struct dev_pm_opp **opp, struct dev_pm_opp *temp_opp,
- unsigned long opp_key, unsigned long key)
- {
- if (opp_key >= key) {
- *opp = temp_opp;
- return true;
- }
- return false;
- }
- static bool _compare_floor(struct dev_pm_opp **opp, struct dev_pm_opp *temp_opp,
- unsigned long opp_key, unsigned long key)
- {
- if (opp_key > key)
- return true;
- *opp = temp_opp;
- return false;
- }
- /* Generic key finding helpers */
- static struct dev_pm_opp *_opp_table_find_key(struct opp_table *opp_table,
- unsigned long *key, int index, bool available,
- unsigned long (*read)(struct dev_pm_opp *opp, int index),
- bool (*compare)(struct dev_pm_opp **opp, struct dev_pm_opp *temp_opp,
- unsigned long opp_key, unsigned long key),
- bool (*assert)(struct opp_table *opp_table))
- {
- struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
- /* Assert that the requirement is met */
- if (assert && !assert(opp_table))
- return ERR_PTR(-EINVAL);
- mutex_lock(&opp_table->lock);
- list_for_each_entry(temp_opp, &opp_table->opp_list, node) {
- if (temp_opp->available == available) {
- if (compare(&opp, temp_opp, read(temp_opp, index), *key))
- break;
- }
- }
- /* Increment the reference count of OPP */
- if (!IS_ERR(opp)) {
- *key = read(opp, index);
- dev_pm_opp_get(opp);
- }
- mutex_unlock(&opp_table->lock);
- return opp;
- }
- static struct dev_pm_opp *
- _find_key(struct device *dev, unsigned long *key, int index, bool available,
- unsigned long (*read)(struct dev_pm_opp *opp, int index),
- bool (*compare)(struct dev_pm_opp **opp, struct dev_pm_opp *temp_opp,
- unsigned long opp_key, unsigned long key),
- bool (*assert)(struct opp_table *opp_table))
- {
- struct opp_table *opp_table;
- struct dev_pm_opp *opp;
- opp_table = _find_opp_table(dev);
- if (IS_ERR(opp_table)) {
- dev_err(dev, "%s: OPP table not found (%ld)\n", __func__,
- PTR_ERR(opp_table));
- return ERR_CAST(opp_table);
- }
- opp = _opp_table_find_key(opp_table, key, index, available, read,
- compare, assert);
- dev_pm_opp_put_opp_table(opp_table);
- return opp;
- }
- static struct dev_pm_opp *_find_key_exact(struct device *dev,
- unsigned long key, int index, bool available,
- unsigned long (*read)(struct dev_pm_opp *opp, int index),
- bool (*assert)(struct opp_table *opp_table))
- {
- /*
- * The value of key will be updated here, but will be ignored as the
- * caller doesn't need it.
- */
- return _find_key(dev, &key, index, available, read, _compare_exact,
- assert);
- }
- static struct dev_pm_opp *_opp_table_find_key_ceil(struct opp_table *opp_table,
- unsigned long *key, int index, bool available,
- unsigned long (*read)(struct dev_pm_opp *opp, int index),
- bool (*assert)(struct opp_table *opp_table))
- {
- return _opp_table_find_key(opp_table, key, index, available, read,
- _compare_ceil, assert);
- }
- static struct dev_pm_opp *_find_key_ceil(struct device *dev, unsigned long *key,
- int index, bool available,
- unsigned long (*read)(struct dev_pm_opp *opp, int index),
- bool (*assert)(struct opp_table *opp_table))
- {
- return _find_key(dev, key, index, available, read, _compare_ceil,
- assert);
- }
- static struct dev_pm_opp *_find_key_floor(struct device *dev,
- unsigned long *key, int index, bool available,
- unsigned long (*read)(struct dev_pm_opp *opp, int index),
- bool (*assert)(struct opp_table *opp_table))
- {
- return _find_key(dev, key, index, available, read, _compare_floor,
- assert);
- }
- /**
- * dev_pm_opp_find_freq_exact() - search for an exact frequency
- * @dev: device for which we do this operation
- * @freq: frequency to search for
- * @available: true/false - match for available opp
- *
- * Return: Searches for exact match in the opp table and returns pointer to the
- * matching opp if found, else returns ERR_PTR in case of error and should
- * be handled using IS_ERR. Error return values can be:
- * EINVAL: for bad pointer
- * ERANGE: no match found for search
- * ENODEV: if device not found in list of registered devices
- *
- * Note: available is a modifier for the search. if available=true, then the
- * match is for exact matching frequency and is available in the stored OPP
- * table. if false, the match is for exact frequency which is not available.
- *
- * This provides a mechanism to enable an opp which is not available currently
- * or the opposite as well.
- *
- * The callers are required to call dev_pm_opp_put() for the returned OPP after
- * use.
- */
- struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
- unsigned long freq, bool available)
- {
- return _find_key_exact(dev, freq, 0, available, _read_freq,
- assert_single_clk);
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_exact);
- static noinline struct dev_pm_opp *_find_freq_ceil(struct opp_table *opp_table,
- unsigned long *freq)
- {
- return _opp_table_find_key_ceil(opp_table, freq, 0, true, _read_freq,
- assert_single_clk);
- }
- /**
- * dev_pm_opp_find_freq_ceil() - Search for an rounded ceil freq
- * @dev: device for which we do this operation
- * @freq: Start frequency
- *
- * Search for the matching ceil *available* OPP from a starting freq
- * for a device.
- *
- * Return: matching *opp and refreshes *freq accordingly, else returns
- * ERR_PTR in case of error and should be handled using IS_ERR. Error return
- * values can be:
- * EINVAL: for bad pointer
- * ERANGE: no match found for search
- * ENODEV: if device not found in list of registered devices
- *
- * The callers are required to call dev_pm_opp_put() for the returned OPP after
- * use.
- */
- struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device *dev,
- unsigned long *freq)
- {
- return _find_key_ceil(dev, freq, 0, true, _read_freq, assert_single_clk);
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_ceil);
- /**
- * dev_pm_opp_find_freq_floor() - Search for a rounded floor freq
- * @dev: device for which we do this operation
- * @freq: Start frequency
- *
- * Search for the matching floor *available* OPP from a starting freq
- * for a device.
- *
- * Return: matching *opp and refreshes *freq accordingly, else returns
- * ERR_PTR in case of error and should be handled using IS_ERR. Error return
- * values can be:
- * EINVAL: for bad pointer
- * ERANGE: no match found for search
- * ENODEV: if device not found in list of registered devices
- *
- * The callers are required to call dev_pm_opp_put() for the returned OPP after
- * use.
- */
- struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev,
- unsigned long *freq)
- {
- return _find_key_floor(dev, freq, 0, true, _read_freq, assert_single_clk);
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_floor);
- /**
- * dev_pm_opp_find_level_exact() - search for an exact level
- * @dev: device for which we do this operation
- * @level: level to search for
- *
- * Return: Searches for exact match in the opp table and returns pointer to the
- * matching opp if found, else returns ERR_PTR in case of error and should
- * be handled using IS_ERR. Error return values can be:
- * EINVAL: for bad pointer
- * ERANGE: no match found for search
- * ENODEV: if device not found in list of registered devices
- *
- * The callers are required to call dev_pm_opp_put() for the returned OPP after
- * use.
- */
- struct dev_pm_opp *dev_pm_opp_find_level_exact(struct device *dev,
- unsigned int level)
- {
- return _find_key_exact(dev, level, 0, true, _read_level, NULL);
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_find_level_exact);
- /**
- * dev_pm_opp_find_level_ceil() - search for an rounded up level
- * @dev: device for which we do this operation
- * @level: level to search for
- *
- * Return: Searches for rounded up match in the opp table and returns pointer
- * to the matching opp if found, else returns ERR_PTR in case of error and
- * should be handled using IS_ERR. Error return values can be:
- * EINVAL: for bad pointer
- * ERANGE: no match found for search
- * ENODEV: if device not found in list of registered devices
- *
- * The callers are required to call dev_pm_opp_put() for the returned OPP after
- * use.
- */
- struct dev_pm_opp *dev_pm_opp_find_level_ceil(struct device *dev,
- unsigned int *level)
- {
- unsigned long temp = *level;
- struct dev_pm_opp *opp;
- opp = _find_key_ceil(dev, &temp, 0, true, _read_level, NULL);
- *level = temp;
- return opp;
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_find_level_ceil);
- /**
- * dev_pm_opp_find_bw_ceil() - Search for a rounded ceil bandwidth
- * @dev: device for which we do this operation
- * @bw: start bandwidth
- * @index: which bandwidth to compare, in case of OPPs with several values
- *
- * Search for the matching floor *available* OPP from a starting bandwidth
- * for a device.
- *
- * Return: matching *opp and refreshes *bw accordingly, else returns
- * ERR_PTR in case of error and should be handled using IS_ERR. Error return
- * values can be:
- * EINVAL: for bad pointer
- * ERANGE: no match found for search
- * ENODEV: if device not found in list of registered devices
- *
- * The callers are required to call dev_pm_opp_put() for the returned OPP after
- * use.
- */
- struct dev_pm_opp *dev_pm_opp_find_bw_ceil(struct device *dev, unsigned int *bw,
- int index)
- {
- unsigned long temp = *bw;
- struct dev_pm_opp *opp;
- opp = _find_key_ceil(dev, &temp, index, true, _read_bw, NULL);
- *bw = temp;
- return opp;
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_find_bw_ceil);
- /**
- * dev_pm_opp_find_bw_floor() - Search for a rounded floor bandwidth
- * @dev: device for which we do this operation
- * @bw: start bandwidth
- * @index: which bandwidth to compare, in case of OPPs with several values
- *
- * Search for the matching floor *available* OPP from a starting bandwidth
- * for a device.
- *
- * Return: matching *opp and refreshes *bw accordingly, else returns
- * ERR_PTR in case of error and should be handled using IS_ERR. Error return
- * values can be:
- * EINVAL: for bad pointer
- * ERANGE: no match found for search
- * ENODEV: if device not found in list of registered devices
- *
- * The callers are required to call dev_pm_opp_put() for the returned OPP after
- * use.
- */
- struct dev_pm_opp *dev_pm_opp_find_bw_floor(struct device *dev,
- unsigned int *bw, int index)
- {
- unsigned long temp = *bw;
- struct dev_pm_opp *opp;
- opp = _find_key_floor(dev, &temp, index, true, _read_bw, NULL);
- *bw = temp;
- return opp;
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_find_bw_floor);
- static int _set_opp_voltage(struct device *dev, struct regulator *reg,
- struct dev_pm_opp_supply *supply)
- {
- int ret;
- /* Regulator not available for device */
- if (IS_ERR(reg)) {
- dev_dbg(dev, "%s: regulator not available: %ld\n", __func__,
- PTR_ERR(reg));
- return 0;
- }
- dev_dbg(dev, "%s: voltages (mV): %lu %lu %lu\n", __func__,
- supply->u_volt_min, supply->u_volt, supply->u_volt_max);
- ret = regulator_set_voltage_triplet(reg, supply->u_volt_min,
- supply->u_volt, supply->u_volt_max);
- if (ret)
- dev_err(dev, "%s: failed to set voltage (%lu %lu %lu mV): %d\n",
- __func__, supply->u_volt_min, supply->u_volt,
- supply->u_volt_max, ret);
- return ret;
- }
- static int
- _opp_config_clk_single(struct device *dev, struct opp_table *opp_table,
- struct dev_pm_opp *opp, void *data, bool scaling_down)
- {
- unsigned long *target = data;
- unsigned long freq;
- int ret;
- /* One of target and opp must be available */
- if (target) {
- freq = *target;
- } else if (opp) {
- freq = opp->rates[0];
- } else {
- WARN_ON(1);
- return -EINVAL;
- }
- ret = clk_set_rate(opp_table->clk, freq);
- if (ret) {
- dev_err(dev, "%s: failed to set clock rate: %d\n", __func__,
- ret);
- } else {
- opp_table->rate_clk_single = freq;
- }
- return ret;
- }
- /*
- * Simple implementation for configuring multiple clocks. Configure clocks in
- * the order in which they are present in the array while scaling up.
- */
- int dev_pm_opp_config_clks_simple(struct device *dev,
- struct opp_table *opp_table, struct dev_pm_opp *opp, void *data,
- bool scaling_down)
- {
- int ret, i;
- if (scaling_down) {
- for (i = opp_table->clk_count - 1; i >= 0; i--) {
- ret = clk_set_rate(opp_table->clks[i], opp->rates[i]);
- if (ret) {
- dev_err(dev, "%s: failed to set clock rate: %d\n", __func__,
- ret);
- return ret;
- }
- }
- } else {
- for (i = 0; i < opp_table->clk_count; i++) {
- ret = clk_set_rate(opp_table->clks[i], opp->rates[i]);
- if (ret) {
- dev_err(dev, "%s: failed to set clock rate: %d\n", __func__,
- ret);
- return ret;
- }
- }
- }
- return 0;
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_config_clks_simple);
- static int _opp_config_regulator_single(struct device *dev,
- struct dev_pm_opp *old_opp, struct dev_pm_opp *new_opp,
- struct regulator **regulators, unsigned int count)
- {
- struct regulator *reg = regulators[0];
- int ret;
- /* This function only supports single regulator per device */
- if (WARN_ON(count > 1)) {
- dev_err(dev, "multiple regulators are not supported\n");
- return -EINVAL;
- }
- ret = _set_opp_voltage(dev, reg, new_opp->supplies);
- if (ret)
- return ret;
- /*
- * Enable the regulator after setting its voltages, otherwise it breaks
- * some boot-enabled regulators.
- */
- if (unlikely(!new_opp->opp_table->enabled)) {
- ret = regulator_enable(reg);
- if (ret < 0)
- dev_warn(dev, "Failed to enable regulator: %d", ret);
- }
- return 0;
- }
- static int _set_opp_bw(const struct opp_table *opp_table,
- struct dev_pm_opp *opp, struct device *dev)
- {
- u32 avg, peak;
- int i, ret;
- if (!opp_table->paths)
- return 0;
- for (i = 0; i < opp_table->path_count; i++) {
- if (!opp) {
- avg = 0;
- peak = 0;
- } else {
- avg = opp->bandwidth[i].avg;
- peak = opp->bandwidth[i].peak;
- }
- ret = icc_set_bw(opp_table->paths[i], avg, peak);
- if (ret) {
- dev_err(dev, "Failed to %s bandwidth[%d]: %d\n",
- opp ? "set" : "remove", i, ret);
- return ret;
- }
- }
- return 0;
- }
- static int _set_required_opp(struct device *dev, struct device *pd_dev,
- struct dev_pm_opp *opp, int i)
- {
- unsigned int pstate = likely(opp) ? opp->required_opps[i]->pstate : 0;
- int ret;
- if (!pd_dev)
- return 0;
- ret = dev_pm_genpd_set_performance_state(pd_dev, pstate);
- if (ret) {
- dev_err(dev, "Failed to set performance state of %s: %d (%d)\n",
- dev_name(pd_dev), pstate, ret);
- }
- return ret;
- }
- /* This is only called for PM domain for now */
- static int _set_required_opps(struct device *dev,
- struct opp_table *opp_table,
- struct dev_pm_opp *opp, bool up)
- {
- struct opp_table **required_opp_tables = opp_table->required_opp_tables;
- struct device **genpd_virt_devs = opp_table->genpd_virt_devs;
- int i, ret = 0;
- if (!required_opp_tables)
- return 0;
- /* required-opps not fully initialized yet */
- if (lazy_linking_pending(opp_table))
- return -EBUSY;
- /*
- * We only support genpd's OPPs in the "required-opps" for now, as we
- * don't know much about other use cases. Error out if the required OPP
- * doesn't belong to a genpd.
- */
- if (unlikely(!required_opp_tables[0]->is_genpd)) {
- dev_err(dev, "required-opps don't belong to a genpd\n");
- return -ENOENT;
- }
- /* Single genpd case */
- if (!genpd_virt_devs)
- return _set_required_opp(dev, dev, opp, 0);
- /* Multiple genpd case */
- /*
- * Acquire genpd_virt_dev_lock to make sure we don't use a genpd_dev
- * after it is freed from another thread.
- */
- mutex_lock(&opp_table->genpd_virt_dev_lock);
- /* Scaling up? Set required OPPs in normal order, else reverse */
- if (up) {
- for (i = 0; i < opp_table->required_opp_count; i++) {
- ret = _set_required_opp(dev, genpd_virt_devs[i], opp, i);
- if (ret)
- break;
- }
- } else {
- for (i = opp_table->required_opp_count - 1; i >= 0; i--) {
- ret = _set_required_opp(dev, genpd_virt_devs[i], opp, i);
- if (ret)
- break;
- }
- }
- mutex_unlock(&opp_table->genpd_virt_dev_lock);
- return ret;
- }
- static void _find_current_opp(struct device *dev, struct opp_table *opp_table)
- {
- struct dev_pm_opp *opp = ERR_PTR(-ENODEV);
- unsigned long freq;
- if (!IS_ERR(opp_table->clk)) {
- freq = clk_get_rate(opp_table->clk);
- opp = _find_freq_ceil(opp_table, &freq);
- }
- /*
- * Unable to find the current OPP ? Pick the first from the list since
- * it is in ascending order, otherwise rest of the code will need to
- * make special checks to validate current_opp.
- */
- if (IS_ERR(opp)) {
- mutex_lock(&opp_table->lock);
- opp = list_first_entry(&opp_table->opp_list, struct dev_pm_opp, node);
- dev_pm_opp_get(opp);
- mutex_unlock(&opp_table->lock);
- }
- opp_table->current_opp = opp;
- }
- static int _disable_opp_table(struct device *dev, struct opp_table *opp_table)
- {
- int ret;
- if (!opp_table->enabled)
- return 0;
- /*
- * Some drivers need to support cases where some platforms may
- * have OPP table for the device, while others don't and
- * opp_set_rate() just needs to behave like clk_set_rate().
- */
- if (!_get_opp_count(opp_table))
- return 0;
- ret = _set_opp_bw(opp_table, NULL, dev);
- if (ret)
- return ret;
- if (opp_table->regulators)
- regulator_disable(opp_table->regulators[0]);
- ret = _set_required_opps(dev, opp_table, NULL, false);
- opp_table->enabled = false;
- return ret;
- }
- static int _set_opp(struct device *dev, struct opp_table *opp_table,
- struct dev_pm_opp *opp, void *clk_data, bool forced)
- {
- struct dev_pm_opp *old_opp;
- int scaling_down, ret;
- if (unlikely(!opp))
- return _disable_opp_table(dev, opp_table);
- /* Find the currently set OPP if we don't know already */
- if (unlikely(!opp_table->current_opp))
- _find_current_opp(dev, opp_table);
- old_opp = opp_table->current_opp;
- /* Return early if nothing to do */
- if (!forced && old_opp == opp && opp_table->enabled) {
- dev_dbg(dev, "%s: OPPs are same, nothing to do\n", __func__);
- return 0;
- }
- dev_dbg(dev, "%s: switching OPP: Freq %lu -> %lu Hz, Level %u -> %u, Bw %u -> %u\n",
- __func__, old_opp->rates[0], opp->rates[0], old_opp->level,
- opp->level, old_opp->bandwidth ? old_opp->bandwidth[0].peak : 0,
- opp->bandwidth ? opp->bandwidth[0].peak : 0);
- scaling_down = _opp_compare_key(opp_table, old_opp, opp);
- if (scaling_down == -1)
- scaling_down = 0;
- /* Scaling up? Configure required OPPs before frequency */
- if (!scaling_down) {
- ret = _set_required_opps(dev, opp_table, opp, true);
- if (ret) {
- dev_err(dev, "Failed to set required opps: %d\n", ret);
- return ret;
- }
- ret = _set_opp_bw(opp_table, opp, dev);
- if (ret) {
- dev_err(dev, "Failed to set bw: %d\n", ret);
- return ret;
- }
- if (opp_table->config_regulators) {
- ret = opp_table->config_regulators(dev, old_opp, opp,
- opp_table->regulators,
- opp_table->regulator_count);
- if (ret) {
- dev_err(dev, "Failed to set regulator voltages: %d\n",
- ret);
- return ret;
- }
- }
- }
- if (opp_table->config_clks) {
- ret = opp_table->config_clks(dev, opp_table, opp, clk_data, scaling_down);
- if (ret)
- return ret;
- }
- /* Scaling down? Configure required OPPs after frequency */
- if (scaling_down) {
- if (opp_table->config_regulators) {
- ret = opp_table->config_regulators(dev, old_opp, opp,
- opp_table->regulators,
- opp_table->regulator_count);
- if (ret) {
- dev_err(dev, "Failed to set regulator voltages: %d\n",
- ret);
- return ret;
- }
- }
- ret = _set_opp_bw(opp_table, opp, dev);
- if (ret) {
- dev_err(dev, "Failed to set bw: %d\n", ret);
- return ret;
- }
- ret = _set_required_opps(dev, opp_table, opp, false);
- if (ret) {
- dev_err(dev, "Failed to set required opps: %d\n", ret);
- return ret;
- }
- }
- opp_table->enabled = true;
- dev_pm_opp_put(old_opp);
- /* Make sure current_opp doesn't get freed */
- dev_pm_opp_get(opp);
- opp_table->current_opp = opp;
- return ret;
- }
- /**
- * dev_pm_opp_set_rate() - Configure new OPP based on frequency
- * @dev: device for which we do this operation
- * @target_freq: frequency to achieve
- *
- * This configures the power-supplies to the levels specified by the OPP
- * corresponding to the target_freq, and programs the clock to a value <=
- * target_freq, as rounded by clk_round_rate(). Device wanting to run at fmax
- * provided by the opp, should have already rounded to the target OPP's
- * frequency.
- */
- int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq)
- {
- struct opp_table *opp_table;
- unsigned long freq = 0, temp_freq;
- struct dev_pm_opp *opp = NULL;
- bool forced = false;
- int ret;
- opp_table = _find_opp_table(dev);
- if (IS_ERR(opp_table)) {
- dev_err(dev, "%s: device's opp table doesn't exist\n", __func__);
- return PTR_ERR(opp_table);
- }
- if (target_freq) {
- /*
- * For IO devices which require an OPP on some platforms/SoCs
- * while just needing to scale the clock on some others
- * we look for empty OPP tables with just a clock handle and
- * scale only the clk. This makes dev_pm_opp_set_rate()
- * equivalent to a clk_set_rate()
- */
- if (!_get_opp_count(opp_table)) {
- ret = opp_table->config_clks(dev, opp_table, NULL,
- &target_freq, false);
- goto put_opp_table;
- }
- freq = clk_round_rate(opp_table->clk, target_freq);
- if ((long)freq <= 0)
- freq = target_freq;
- /*
- * The clock driver may support finer resolution of the
- * frequencies than the OPP table, don't update the frequency we
- * pass to clk_set_rate() here.
- */
- temp_freq = freq;
- opp = _find_freq_ceil(opp_table, &temp_freq);
- if (IS_ERR(opp)) {
- ret = PTR_ERR(opp);
- dev_err(dev, "%s: failed to find OPP for freq %lu (%d)\n",
- __func__, freq, ret);
- goto put_opp_table;
- }
- /*
- * An OPP entry specifies the highest frequency at which other
- * properties of the OPP entry apply. Even if the new OPP is
- * same as the old one, we may still reach here for a different
- * value of the frequency. In such a case, do not abort but
- * configure the hardware to the desired frequency forcefully.
- */
- forced = opp_table->rate_clk_single != target_freq;
- }
- ret = _set_opp(dev, opp_table, opp, &target_freq, forced);
- if (target_freq)
- dev_pm_opp_put(opp);
- put_opp_table:
- dev_pm_opp_put_opp_table(opp_table);
- return ret;
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_set_rate);
- /**
- * dev_pm_opp_set_opp() - Configure device for OPP
- * @dev: device for which we do this operation
- * @opp: OPP to set to
- *
- * This configures the device based on the properties of the OPP passed to this
- * routine.
- *
- * Return: 0 on success, a negative error number otherwise.
- */
- int dev_pm_opp_set_opp(struct device *dev, struct dev_pm_opp *opp)
- {
- struct opp_table *opp_table;
- int ret;
- opp_table = _find_opp_table(dev);
- if (IS_ERR(opp_table)) {
- dev_err(dev, "%s: device opp doesn't exist\n", __func__);
- return PTR_ERR(opp_table);
- }
- ret = _set_opp(dev, opp_table, opp, NULL, false);
- dev_pm_opp_put_opp_table(opp_table);
- return ret;
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_set_opp);
- /* OPP-dev Helpers */
- static void _remove_opp_dev(struct opp_device *opp_dev,
- struct opp_table *opp_table)
- {
- opp_debug_unregister(opp_dev, opp_table);
- list_del(&opp_dev->node);
- kfree(opp_dev);
- }
- struct opp_device *_add_opp_dev(const struct device *dev,
- struct opp_table *opp_table)
- {
- struct opp_device *opp_dev;
- opp_dev = kzalloc(sizeof(*opp_dev), GFP_KERNEL);
- if (!opp_dev)
- return NULL;
- /* Initialize opp-dev */
- opp_dev->dev = dev;
- mutex_lock(&opp_table->lock);
- list_add(&opp_dev->node, &opp_table->dev_list);
- mutex_unlock(&opp_table->lock);
- /* Create debugfs entries for the opp_table */
- opp_debug_register(opp_dev, opp_table);
- return opp_dev;
- }
- static struct opp_table *_allocate_opp_table(struct device *dev, int index)
- {
- struct opp_table *opp_table;
- struct opp_device *opp_dev;
- int ret;
- /*
- * Allocate a new OPP table. In the infrequent case where a new
- * device is needed to be added, we pay this penalty.
- */
- opp_table = kzalloc(sizeof(*opp_table), GFP_KERNEL);
- if (!opp_table)
- return ERR_PTR(-ENOMEM);
- mutex_init(&opp_table->lock);
- mutex_init(&opp_table->genpd_virt_dev_lock);
- INIT_LIST_HEAD(&opp_table->dev_list);
- INIT_LIST_HEAD(&opp_table->lazy);
- opp_table->clk = ERR_PTR(-ENODEV);
- /* Mark regulator count uninitialized */
- opp_table->regulator_count = -1;
- opp_dev = _add_opp_dev(dev, opp_table);
- if (!opp_dev) {
- ret = -ENOMEM;
- goto err;
- }
- _of_init_opp_table(opp_table, dev, index);
- /* Find interconnect path(s) for the device */
- ret = dev_pm_opp_of_find_icc_paths(dev, opp_table);
- if (ret) {
- if (ret == -EPROBE_DEFER)
- goto remove_opp_dev;
- dev_warn(dev, "%s: Error finding interconnect paths: %d\n",
- __func__, ret);
- }
- BLOCKING_INIT_NOTIFIER_HEAD(&opp_table->head);
- INIT_LIST_HEAD(&opp_table->opp_list);
- kref_init(&opp_table->kref);
- return opp_table;
- remove_opp_dev:
- _of_clear_opp_table(opp_table);
- _remove_opp_dev(opp_dev, opp_table);
- mutex_destroy(&opp_table->genpd_virt_dev_lock);
- mutex_destroy(&opp_table->lock);
- err:
- kfree(opp_table);
- return ERR_PTR(ret);
- }
- void _get_opp_table_kref(struct opp_table *opp_table)
- {
- kref_get(&opp_table->kref);
- }
- static struct opp_table *_update_opp_table_clk(struct device *dev,
- struct opp_table *opp_table,
- bool getclk)
- {
- int ret;
- /*
- * Return early if we don't need to get clk or we have already done it
- * earlier.
- */
- if (!getclk || IS_ERR(opp_table) || !IS_ERR(opp_table->clk) ||
- opp_table->clks)
- return opp_table;
- /* Find clk for the device */
- opp_table->clk = clk_get(dev, NULL);
- ret = PTR_ERR_OR_ZERO(opp_table->clk);
- if (!ret) {
- opp_table->config_clks = _opp_config_clk_single;
- opp_table->clk_count = 1;
- return opp_table;
- }
- if (ret == -ENOENT) {
- /*
- * There are few platforms which don't want the OPP core to
- * manage device's clock settings. In such cases neither the
- * platform provides the clks explicitly to us, nor the DT
- * contains a valid clk entry. The OPP nodes in DT may still
- * contain "opp-hz" property though, which we need to parse and
- * allow the platform to find an OPP based on freq later on.
- *
- * This is a simple solution to take care of such corner cases,
- * i.e. make the clk_count 1, which lets us allocate space for
- * frequency in opp->rates and also parse the entries in DT.
- */
- opp_table->clk_count = 1;
- dev_dbg(dev, "%s: Couldn't find clock: %d\n", __func__, ret);
- return opp_table;
- }
- dev_pm_opp_put_opp_table(opp_table);
- dev_err_probe(dev, ret, "Couldn't find clock\n");
- return ERR_PTR(ret);
- }
- /*
- * We need to make sure that the OPP table for a device doesn't get added twice,
- * if this routine gets called in parallel with the same device pointer.
- *
- * The simplest way to enforce that is to perform everything (find existing
- * table and if not found, create a new one) under the opp_table_lock, so only
- * one creator gets access to the same. But that expands the critical section
- * under the lock and may end up causing circular dependencies with frameworks
- * like debugfs, interconnect or clock framework as they may be direct or
- * indirect users of OPP core.
- *
- * And for that reason we have to go for a bit tricky implementation here, which
- * uses the opp_tables_busy flag to indicate if another creator is in the middle
- * of adding an OPP table and others should wait for it to finish.
- */
- struct opp_table *_add_opp_table_indexed(struct device *dev, int index,
- bool getclk)
- {
- struct opp_table *opp_table;
- again:
- mutex_lock(&opp_table_lock);
- opp_table = _find_opp_table_unlocked(dev);
- if (!IS_ERR(opp_table))
- goto unlock;
- /*
- * The opp_tables list or an OPP table's dev_list is getting updated by
- * another user, wait for it to finish.
- */
- if (unlikely(opp_tables_busy)) {
- mutex_unlock(&opp_table_lock);
- cpu_relax();
- goto again;
- }
- opp_tables_busy = true;
- opp_table = _managed_opp(dev, index);
- /* Drop the lock to reduce the size of critical section */
- mutex_unlock(&opp_table_lock);
- if (opp_table) {
- if (!_add_opp_dev(dev, opp_table)) {
- dev_pm_opp_put_opp_table(opp_table);
- opp_table = ERR_PTR(-ENOMEM);
- }
- mutex_lock(&opp_table_lock);
- } else {
- opp_table = _allocate_opp_table(dev, index);
- mutex_lock(&opp_table_lock);
- if (!IS_ERR(opp_table))
- list_add(&opp_table->node, &opp_tables);
- }
- opp_tables_busy = false;
- unlock:
- mutex_unlock(&opp_table_lock);
- return _update_opp_table_clk(dev, opp_table, getclk);
- }
- static struct opp_table *_add_opp_table(struct device *dev, bool getclk)
- {
- return _add_opp_table_indexed(dev, 0, getclk);
- }
- struct opp_table *dev_pm_opp_get_opp_table(struct device *dev)
- {
- return _find_opp_table(dev);
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_get_opp_table);
- static void _opp_table_kref_release(struct kref *kref)
- {
- struct opp_table *opp_table = container_of(kref, struct opp_table, kref);
- struct opp_device *opp_dev, *temp;
- int i;
- /* Drop the lock as soon as we can */
- list_del(&opp_table->node);
- mutex_unlock(&opp_table_lock);
- if (opp_table->current_opp)
- dev_pm_opp_put(opp_table->current_opp);
- _of_clear_opp_table(opp_table);
- /* Release automatically acquired single clk */
- if (!IS_ERR(opp_table->clk))
- clk_put(opp_table->clk);
- if (opp_table->paths) {
- for (i = 0; i < opp_table->path_count; i++)
- icc_put(opp_table->paths[i]);
- kfree(opp_table->paths);
- }
- WARN_ON(!list_empty(&opp_table->opp_list));
- list_for_each_entry_safe(opp_dev, temp, &opp_table->dev_list, node) {
- /*
- * The OPP table is getting removed, drop the performance state
- * constraints.
- */
- if (opp_table->genpd_performance_state)
- dev_pm_genpd_set_performance_state((struct device *)(opp_dev->dev), 0);
- _remove_opp_dev(opp_dev, opp_table);
- }
- mutex_destroy(&opp_table->genpd_virt_dev_lock);
- mutex_destroy(&opp_table->lock);
- kfree(opp_table);
- }
- void dev_pm_opp_put_opp_table(struct opp_table *opp_table)
- {
- kref_put_mutex(&opp_table->kref, _opp_table_kref_release,
- &opp_table_lock);
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_put_opp_table);
- void _opp_free(struct dev_pm_opp *opp)
- {
- kfree(opp);
- }
- static void _opp_kref_release(struct kref *kref)
- {
- struct dev_pm_opp *opp = container_of(kref, struct dev_pm_opp, kref);
- struct opp_table *opp_table = opp->opp_table;
- list_del(&opp->node);
- mutex_unlock(&opp_table->lock);
- /*
- * Notify the changes in the availability of the operable
- * frequency/voltage list.
- */
- blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_REMOVE, opp);
- _of_clear_opp(opp_table, opp);
- opp_debug_remove_one(opp);
- kfree(opp);
- }
- void dev_pm_opp_get(struct dev_pm_opp *opp)
- {
- kref_get(&opp->kref);
- }
- void dev_pm_opp_put(struct dev_pm_opp *opp)
- {
- kref_put_mutex(&opp->kref, _opp_kref_release, &opp->opp_table->lock);
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_put);
- /**
- * dev_pm_opp_remove() - Remove an OPP from OPP table
- * @dev: device for which we do this operation
- * @freq: OPP to remove with matching 'freq'
- *
- * This function removes an opp from the opp table.
- */
- void dev_pm_opp_remove(struct device *dev, unsigned long freq)
- {
- struct dev_pm_opp *opp = NULL, *iter;
- struct opp_table *opp_table;
- opp_table = _find_opp_table(dev);
- if (IS_ERR(opp_table))
- return;
- if (!assert_single_clk(opp_table))
- goto put_table;
- mutex_lock(&opp_table->lock);
- list_for_each_entry(iter, &opp_table->opp_list, node) {
- if (iter->rates[0] == freq) {
- opp = iter;
- break;
- }
- }
- mutex_unlock(&opp_table->lock);
- if (opp) {
- dev_pm_opp_put(opp);
- /* Drop the reference taken by dev_pm_opp_add() */
- dev_pm_opp_put_opp_table(opp_table);
- } else {
- dev_warn(dev, "%s: Couldn't find OPP with freq: %lu\n",
- __func__, freq);
- }
- put_table:
- /* Drop the reference taken by _find_opp_table() */
- dev_pm_opp_put_opp_table(opp_table);
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_remove);
- static struct dev_pm_opp *_opp_get_next(struct opp_table *opp_table,
- bool dynamic)
- {
- struct dev_pm_opp *opp = NULL, *temp;
- mutex_lock(&opp_table->lock);
- list_for_each_entry(temp, &opp_table->opp_list, node) {
- /*
- * Refcount must be dropped only once for each OPP by OPP core,
- * do that with help of "removed" flag.
- */
- if (!temp->removed && dynamic == temp->dynamic) {
- opp = temp;
- break;
- }
- }
- mutex_unlock(&opp_table->lock);
- return opp;
- }
- /*
- * Can't call dev_pm_opp_put() from under the lock as debugfs removal needs to
- * happen lock less to avoid circular dependency issues. This routine must be
- * called without the opp_table->lock held.
- */
- static void _opp_remove_all(struct opp_table *opp_table, bool dynamic)
- {
- struct dev_pm_opp *opp;
- while ((opp = _opp_get_next(opp_table, dynamic))) {
- opp->removed = true;
- dev_pm_opp_put(opp);
- /* Drop the references taken by dev_pm_opp_add() */
- if (dynamic)
- dev_pm_opp_put_opp_table(opp_table);
- }
- }
- bool _opp_remove_all_static(struct opp_table *opp_table)
- {
- mutex_lock(&opp_table->lock);
- if (!opp_table->parsed_static_opps) {
- mutex_unlock(&opp_table->lock);
- return false;
- }
- if (--opp_table->parsed_static_opps) {
- mutex_unlock(&opp_table->lock);
- return true;
- }
- mutex_unlock(&opp_table->lock);
- _opp_remove_all(opp_table, false);
- return true;
- }
- /**
- * dev_pm_opp_remove_all_dynamic() - Remove all dynamically created OPPs
- * @dev: device for which we do this operation
- *
- * This function removes all dynamically created OPPs from the opp table.
- */
- void dev_pm_opp_remove_all_dynamic(struct device *dev)
- {
- struct opp_table *opp_table;
- opp_table = _find_opp_table(dev);
- if (IS_ERR(opp_table))
- return;
- _opp_remove_all(opp_table, true);
- /* Drop the reference taken by _find_opp_table() */
- dev_pm_opp_put_opp_table(opp_table);
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_remove_all_dynamic);
- struct dev_pm_opp *_opp_allocate(struct opp_table *opp_table)
- {
- struct dev_pm_opp *opp;
- int supply_count, supply_size, icc_size, clk_size;
- /* Allocate space for at least one supply */
- supply_count = opp_table->regulator_count > 0 ?
- opp_table->regulator_count : 1;
- supply_size = sizeof(*opp->supplies) * supply_count;
- clk_size = sizeof(*opp->rates) * opp_table->clk_count;
- icc_size = sizeof(*opp->bandwidth) * opp_table->path_count;
- /* allocate new OPP node and supplies structures */
- opp = kzalloc(sizeof(*opp) + supply_size + clk_size + icc_size, GFP_KERNEL);
- if (!opp)
- return NULL;
- /* Put the supplies, bw and clock at the end of the OPP structure */
- opp->supplies = (struct dev_pm_opp_supply *)(opp + 1);
- opp->rates = (unsigned long *)(opp->supplies + supply_count);
- if (icc_size)
- opp->bandwidth = (struct dev_pm_opp_icc_bw *)(opp->rates + opp_table->clk_count);
- INIT_LIST_HEAD(&opp->node);
- return opp;
- }
- static bool _opp_supported_by_regulators(struct dev_pm_opp *opp,
- struct opp_table *opp_table)
- {
- struct regulator *reg;
- int i;
- if (!opp_table->regulators)
- return true;
- for (i = 0; i < opp_table->regulator_count; i++) {
- reg = opp_table->regulators[i];
- if (!regulator_is_supported_voltage(reg,
- opp->supplies[i].u_volt_min,
- opp->supplies[i].u_volt_max)) {
- pr_warn("%s: OPP minuV: %lu maxuV: %lu, not supported by regulator\n",
- __func__, opp->supplies[i].u_volt_min,
- opp->supplies[i].u_volt_max);
- return false;
- }
- }
- return true;
- }
- static int _opp_compare_rate(struct opp_table *opp_table,
- struct dev_pm_opp *opp1, struct dev_pm_opp *opp2)
- {
- int i;
- for (i = 0; i < opp_table->clk_count; i++) {
- if (opp1->rates[i] != opp2->rates[i])
- return opp1->rates[i] < opp2->rates[i] ? -1 : 1;
- }
- /* Same rates for both OPPs */
- return 0;
- }
- static int _opp_compare_bw(struct opp_table *opp_table, struct dev_pm_opp *opp1,
- struct dev_pm_opp *opp2)
- {
- int i;
- for (i = 0; i < opp_table->path_count; i++) {
- if (opp1->bandwidth[i].peak != opp2->bandwidth[i].peak)
- return opp1->bandwidth[i].peak < opp2->bandwidth[i].peak ? -1 : 1;
- }
- /* Same bw for both OPPs */
- return 0;
- }
- /*
- * Returns
- * 0: opp1 == opp2
- * 1: opp1 > opp2
- * -1: opp1 < opp2
- */
- int _opp_compare_key(struct opp_table *opp_table, struct dev_pm_opp *opp1,
- struct dev_pm_opp *opp2)
- {
- int ret;
- ret = _opp_compare_rate(opp_table, opp1, opp2);
- if (ret)
- return ret;
- ret = _opp_compare_bw(opp_table, opp1, opp2);
- if (ret)
- return ret;
- if (opp1->level != opp2->level)
- return opp1->level < opp2->level ? -1 : 1;
- /* Duplicate OPPs */
- return 0;
- }
- static int _opp_is_duplicate(struct device *dev, struct dev_pm_opp *new_opp,
- struct opp_table *opp_table,
- struct list_head **head)
- {
- struct dev_pm_opp *opp;
- int opp_cmp;
- /*
- * Insert new OPP in order of increasing frequency and discard if
- * already present.
- *
- * Need to use &opp_table->opp_list in the condition part of the 'for'
- * loop, don't replace it with head otherwise it will become an infinite
- * loop.
- */
- list_for_each_entry(opp, &opp_table->opp_list, node) {
- opp_cmp = _opp_compare_key(opp_table, new_opp, opp);
- if (opp_cmp > 0) {
- *head = &opp->node;
- continue;
- }
- if (opp_cmp < 0)
- return 0;
- /* Duplicate OPPs */
- dev_warn(dev, "%s: duplicate OPPs detected. Existing: freq: %lu, volt: %lu, enabled: %d. New: freq: %lu, volt: %lu, enabled: %d\n",
- __func__, opp->rates[0], opp->supplies[0].u_volt,
- opp->available, new_opp->rates[0],
- new_opp->supplies[0].u_volt, new_opp->available);
- /* Should we compare voltages for all regulators here ? */
- return opp->available &&
- new_opp->supplies[0].u_volt == opp->supplies[0].u_volt ? -EBUSY : -EEXIST;
- }
- return 0;
- }
- void _required_opps_available(struct dev_pm_opp *opp, int count)
- {
- int i;
- for (i = 0; i < count; i++) {
- if (opp->required_opps[i]->available)
- continue;
- opp->available = false;
- pr_warn("%s: OPP not supported by required OPP %pOF (%lu)\n",
- __func__, opp->required_opps[i]->np, opp->rates[0]);
- return;
- }
- }
- /*
- * Returns:
- * 0: On success. And appropriate error message for duplicate OPPs.
- * -EBUSY: For OPP with same freq/volt and is available. The callers of
- * _opp_add() must return 0 if they receive -EBUSY from it. This is to make
- * sure we don't print error messages unnecessarily if different parts of
- * kernel try to initialize the OPP table.
- * -EEXIST: For OPP with same freq but different volt or is unavailable. This
- * should be considered an error by the callers of _opp_add().
- */
- int _opp_add(struct device *dev, struct dev_pm_opp *new_opp,
- struct opp_table *opp_table)
- {
- struct list_head *head;
- int ret;
- mutex_lock(&opp_table->lock);
- head = &opp_table->opp_list;
- ret = _opp_is_duplicate(dev, new_opp, opp_table, &head);
- if (ret) {
- mutex_unlock(&opp_table->lock);
- return ret;
- }
- list_add(&new_opp->node, head);
- mutex_unlock(&opp_table->lock);
- new_opp->opp_table = opp_table;
- kref_init(&new_opp->kref);
- opp_debug_create_one(new_opp, opp_table);
- if (!_opp_supported_by_regulators(new_opp, opp_table)) {
- new_opp->available = false;
- dev_warn(dev, "%s: OPP not supported by regulators (%lu)\n",
- __func__, new_opp->rates[0]);
- }
- /* required-opps not fully initialized yet */
- if (lazy_linking_pending(opp_table))
- return 0;
- _required_opps_available(new_opp, opp_table->required_opp_count);
- return 0;
- }
- /**
- * _opp_add_v1() - Allocate a OPP based on v1 bindings.
- * @opp_table: OPP table
- * @dev: device for which we do this operation
- * @freq: Frequency in Hz for this OPP
- * @u_volt: Voltage in uVolts for this OPP
- * @dynamic: Dynamically added OPPs.
- *
- * This function adds an opp definition to the opp table and returns status.
- * The opp is made available by default and it can be controlled using
- * dev_pm_opp_enable/disable functions and may be removed by dev_pm_opp_remove.
- *
- * NOTE: "dynamic" parameter impacts OPPs added by the dev_pm_opp_of_add_table
- * and freed by dev_pm_opp_of_remove_table.
- *
- * Return:
- * 0 On success OR
- * Duplicate OPPs (both freq and volt are same) and opp->available
- * -EEXIST Freq are same and volt are different OR
- * Duplicate OPPs (both freq and volt are same) and !opp->available
- * -ENOMEM Memory allocation failure
- */
- int _opp_add_v1(struct opp_table *opp_table, struct device *dev,
- unsigned long freq, long u_volt, bool dynamic)
- {
- struct dev_pm_opp *new_opp;
- unsigned long tol;
- int ret;
- if (!assert_single_clk(opp_table))
- return -EINVAL;
- new_opp = _opp_allocate(opp_table);
- if (!new_opp)
- return -ENOMEM;
- /* populate the opp table */
- new_opp->rates[0] = freq;
- tol = u_volt * opp_table->voltage_tolerance_v1 / 100;
- new_opp->supplies[0].u_volt = u_volt;
- new_opp->supplies[0].u_volt_min = u_volt - tol;
- new_opp->supplies[0].u_volt_max = u_volt + tol;
- new_opp->available = true;
- new_opp->dynamic = dynamic;
- ret = _opp_add(dev, new_opp, opp_table);
- if (ret) {
- /* Don't return error for duplicate OPPs */
- if (ret == -EBUSY)
- ret = 0;
- goto free_opp;
- }
- /*
- * Notify the changes in the availability of the operable
- * frequency/voltage list.
- */
- blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ADD, new_opp);
- return 0;
- free_opp:
- _opp_free(new_opp);
- return ret;
- }
- /**
- * _opp_set_supported_hw() - Set supported platforms
- * @dev: Device for which supported-hw has to be set.
- * @versions: Array of hierarchy of versions to match.
- * @count: Number of elements in the array.
- *
- * This is required only for the V2 bindings, and it enables a platform to
- * specify the hierarchy of versions it supports. OPP layer will then enable
- * OPPs, which are available for those versions, based on its 'opp-supported-hw'
- * property.
- */
- static int _opp_set_supported_hw(struct opp_table *opp_table,
- const u32 *versions, unsigned int count)
- {
- /* Another CPU that shares the OPP table has set the property ? */
- if (opp_table->supported_hw)
- return 0;
- opp_table->supported_hw = kmemdup(versions, count * sizeof(*versions),
- GFP_KERNEL);
- if (!opp_table->supported_hw)
- return -ENOMEM;
- opp_table->supported_hw_count = count;
- return 0;
- }
- /**
- * _opp_put_supported_hw() - Releases resources blocked for supported hw
- * @opp_table: OPP table returned by _opp_set_supported_hw().
- *
- * This is required only for the V2 bindings, and is called for a matching
- * _opp_set_supported_hw(). Until this is called, the opp_table structure
- * will not be freed.
- */
- static void _opp_put_supported_hw(struct opp_table *opp_table)
- {
- if (opp_table->supported_hw) {
- kfree(opp_table->supported_hw);
- opp_table->supported_hw = NULL;
- opp_table->supported_hw_count = 0;
- }
- }
- /**
- * _opp_set_prop_name() - Set prop-extn name
- * @dev: Device for which the prop-name has to be set.
- * @name: name to postfix to properties.
- *
- * This is required only for the V2 bindings, and it enables a platform to
- * specify the extn to be used for certain property names. The properties to
- * which the extension will apply are opp-microvolt and opp-microamp. OPP core
- * should postfix the property name with -<name> while looking for them.
- */
- static int _opp_set_prop_name(struct opp_table *opp_table, const char *name)
- {
- /* Another CPU that shares the OPP table has set the property ? */
- if (!opp_table->prop_name) {
- opp_table->prop_name = kstrdup(name, GFP_KERNEL);
- if (!opp_table->prop_name)
- return -ENOMEM;
- }
- return 0;
- }
- /**
- * _opp_put_prop_name() - Releases resources blocked for prop-name
- * @opp_table: OPP table returned by _opp_set_prop_name().
- *
- * This is required only for the V2 bindings, and is called for a matching
- * _opp_set_prop_name(). Until this is called, the opp_table structure
- * will not be freed.
- */
- static void _opp_put_prop_name(struct opp_table *opp_table)
- {
- if (opp_table->prop_name) {
- kfree(opp_table->prop_name);
- opp_table->prop_name = NULL;
- }
- }
- /**
- * _opp_set_regulators() - Set regulator names for the device
- * @dev: Device for which regulator name is being set.
- * @names: Array of pointers to the names of the regulator.
- * @count: Number of regulators.
- *
- * In order to support OPP switching, OPP layer needs to know the name of the
- * device's regulators, as the core would be required to switch voltages as
- * well.
- *
- * This must be called before any OPPs are initialized for the device.
- */
- static int _opp_set_regulators(struct opp_table *opp_table, struct device *dev,
- const char * const names[])
- {
- const char * const *temp = names;
- struct regulator *reg;
- int count = 0, ret, i;
- /* Count number of regulators */
- while (*temp++)
- count++;
- if (!count)
- return -EINVAL;
- /* Another CPU that shares the OPP table has set the regulators ? */
- if (opp_table->regulators)
- return 0;
- opp_table->regulators = kmalloc_array(count,
- sizeof(*opp_table->regulators),
- GFP_KERNEL);
- if (!opp_table->regulators)
- return -ENOMEM;
- for (i = 0; i < count; i++) {
- reg = regulator_get_optional(dev, names[i]);
- if (IS_ERR(reg)) {
- ret = dev_err_probe(dev, PTR_ERR(reg),
- "%s: no regulator (%s) found\n",
- __func__, names[i]);
- goto free_regulators;
- }
- opp_table->regulators[i] = reg;
- }
- opp_table->regulator_count = count;
- /* Set generic config_regulators() for single regulators here */
- if (count == 1)
- opp_table->config_regulators = _opp_config_regulator_single;
- return 0;
- free_regulators:
- while (i != 0)
- regulator_put(opp_table->regulators[--i]);
- kfree(opp_table->regulators);
- opp_table->regulators = NULL;
- opp_table->regulator_count = -1;
- return ret;
- }
- /**
- * _opp_put_regulators() - Releases resources blocked for regulator
- * @opp_table: OPP table returned from _opp_set_regulators().
- */
- static void _opp_put_regulators(struct opp_table *opp_table)
- {
- int i;
- if (!opp_table->regulators)
- return;
- if (opp_table->enabled) {
- for (i = opp_table->regulator_count - 1; i >= 0; i--)
- regulator_disable(opp_table->regulators[i]);
- }
- for (i = opp_table->regulator_count - 1; i >= 0; i--)
- regulator_put(opp_table->regulators[i]);
- kfree(opp_table->regulators);
- opp_table->regulators = NULL;
- opp_table->regulator_count = -1;
- }
- static void _put_clks(struct opp_table *opp_table, int count)
- {
- int i;
- for (i = count - 1; i >= 0; i--)
- clk_put(opp_table->clks[i]);
- kfree(opp_table->clks);
- opp_table->clks = NULL;
- }
- /**
- * _opp_set_clknames() - Set clk names for the device
- * @dev: Device for which clk names is being set.
- * @names: Clk names.
- *
- * In order to support OPP switching, OPP layer needs to get pointers to the
- * clocks for the device. Simple cases work fine without using this routine
- * (i.e. by passing connection-id as NULL), but for a device with multiple
- * clocks available, the OPP core needs to know the exact names of the clks to
- * use.
- *
- * This must be called before any OPPs are initialized for the device.
- */
- static int _opp_set_clknames(struct opp_table *opp_table, struct device *dev,
- const char * const names[],
- config_clks_t config_clks)
- {
- const char * const *temp = names;
- int count = 0, ret, i;
- struct clk *clk;
- /* Count number of clks */
- while (*temp++)
- count++;
- /*
- * This is a special case where we have a single clock, whose connection
- * id name is NULL, i.e. first two entries are NULL in the array.
- */
- if (!count && !names[1])
- count = 1;
- /* Fail early for invalid configurations */
- if (!count || (!config_clks && count > 1))
- return -EINVAL;
- /* Another CPU that shares the OPP table has set the clkname ? */
- if (opp_table->clks)
- return 0;
- opp_table->clks = kmalloc_array(count, sizeof(*opp_table->clks),
- GFP_KERNEL);
- if (!opp_table->clks)
- return -ENOMEM;
- /* Find clks for the device */
- for (i = 0; i < count; i++) {
- clk = clk_get(dev, names[i]);
- if (IS_ERR(clk)) {
- ret = dev_err_probe(dev, PTR_ERR(clk),
- "%s: Couldn't find clock with name: %s\n",
- __func__, names[i]);
- goto free_clks;
- }
- opp_table->clks[i] = clk;
- }
- opp_table->clk_count = count;
- opp_table->config_clks = config_clks;
- /* Set generic single clk set here */
- if (count == 1) {
- if (!opp_table->config_clks)
- opp_table->config_clks = _opp_config_clk_single;
- /*
- * We could have just dropped the "clk" field and used "clks"
- * everywhere. Instead we kept the "clk" field around for
- * following reasons:
- *
- * - avoiding clks[0] everywhere else.
- * - not running single clk helpers for multiple clk usecase by
- * mistake.
- *
- * Since this is single-clk case, just update the clk pointer
- * too.
- */
- opp_table->clk = opp_table->clks[0];
- }
- return 0;
- free_clks:
- _put_clks(opp_table, i);
- return ret;
- }
- /**
- * _opp_put_clknames() - Releases resources blocked for clks.
- * @opp_table: OPP table returned from _opp_set_clknames().
- */
- static void _opp_put_clknames(struct opp_table *opp_table)
- {
- if (!opp_table->clks)
- return;
- opp_table->config_clks = NULL;
- opp_table->clk = ERR_PTR(-ENODEV);
- _put_clks(opp_table, opp_table->clk_count);
- }
- /**
- * _opp_set_config_regulators_helper() - Register custom set regulator helper.
- * @dev: Device for which the helper is getting registered.
- * @config_regulators: Custom set regulator helper.
- *
- * This is useful to support platforms with multiple regulators per device.
- *
- * This must be called before any OPPs are initialized for the device.
- */
- static int _opp_set_config_regulators_helper(struct opp_table *opp_table,
- struct device *dev, config_regulators_t config_regulators)
- {
- /* Another CPU that shares the OPP table has set the helper ? */
- if (!opp_table->config_regulators)
- opp_table->config_regulators = config_regulators;
- return 0;
- }
- /**
- * _opp_put_config_regulators_helper() - Releases resources blocked for
- * config_regulators helper.
- * @opp_table: OPP table returned from _opp_set_config_regulators_helper().
- *
- * Release resources blocked for platform specific config_regulators helper.
- */
- static void _opp_put_config_regulators_helper(struct opp_table *opp_table)
- {
- if (opp_table->config_regulators)
- opp_table->config_regulators = NULL;
- }
- static void _detach_genpd(struct opp_table *opp_table)
- {
- int index;
- if (!opp_table->genpd_virt_devs)
- return;
- for (index = 0; index < opp_table->required_opp_count; index++) {
- if (!opp_table->genpd_virt_devs[index])
- continue;
- dev_pm_domain_detach(opp_table->genpd_virt_devs[index], false);
- opp_table->genpd_virt_devs[index] = NULL;
- }
- kfree(opp_table->genpd_virt_devs);
- opp_table->genpd_virt_devs = NULL;
- }
- /**
- * _opp_attach_genpd - Attach genpd(s) for the device and save virtual device pointer
- * @dev: Consumer device for which the genpd is getting attached.
- * @names: Null terminated array of pointers containing names of genpd to attach.
- * @virt_devs: Pointer to return the array of virtual devices.
- *
- * Multiple generic power domains for a device are supported with the help of
- * virtual genpd devices, which are created for each consumer device - genpd
- * pair. These are the device structures which are attached to the power domain
- * and are required by the OPP core to set the performance state of the genpd.
- * The same API also works for the case where single genpd is available and so
- * we don't need to support that separately.
- *
- * This helper will normally be called by the consumer driver of the device
- * "dev", as only that has details of the genpd names.
- *
- * This helper needs to be called once with a list of all genpd to attach.
- * Otherwise the original device structure will be used instead by the OPP core.
- *
- * The order of entries in the names array must match the order in which
- * "required-opps" are added in DT.
- */
- static int _opp_attach_genpd(struct opp_table *opp_table, struct device *dev,
- const char * const *names, struct device ***virt_devs)
- {
- struct device *virt_dev;
- int index = 0, ret = -EINVAL;
- const char * const *name = names;
- if (opp_table->genpd_virt_devs)
- return 0;
- /*
- * If the genpd's OPP table isn't already initialized, parsing of the
- * required-opps fail for dev. We should retry this after genpd's OPP
- * table is added.
- */
- if (!opp_table->required_opp_count)
- return -EPROBE_DEFER;
- mutex_lock(&opp_table->genpd_virt_dev_lock);
- opp_table->genpd_virt_devs = kcalloc(opp_table->required_opp_count,
- sizeof(*opp_table->genpd_virt_devs),
- GFP_KERNEL);
- if (!opp_table->genpd_virt_devs)
- goto unlock;
- while (*name) {
- if (index >= opp_table->required_opp_count) {
- dev_err(dev, "Index can't be greater than required-opp-count - 1, %s (%d : %d)\n",
- *name, opp_table->required_opp_count, index);
- goto err;
- }
- virt_dev = dev_pm_domain_attach_by_name(dev, *name);
- if (IS_ERR_OR_NULL(virt_dev)) {
- ret = virt_dev ? PTR_ERR(virt_dev) : -ENODEV;
- dev_err(dev, "Couldn't attach to pm_domain: %d\n", ret);
- goto err;
- }
- opp_table->genpd_virt_devs[index] = virt_dev;
- index++;
- name++;
- }
- if (virt_devs)
- *virt_devs = opp_table->genpd_virt_devs;
- mutex_unlock(&opp_table->genpd_virt_dev_lock);
- return 0;
- err:
- _detach_genpd(opp_table);
- unlock:
- mutex_unlock(&opp_table->genpd_virt_dev_lock);
- return ret;
- }
- /**
- * _opp_detach_genpd() - Detach genpd(s) from the device.
- * @opp_table: OPP table returned by _opp_attach_genpd().
- *
- * This detaches the genpd(s), resets the virtual device pointers, and puts the
- * OPP table.
- */
- static void _opp_detach_genpd(struct opp_table *opp_table)
- {
- /*
- * Acquire genpd_virt_dev_lock to make sure virt_dev isn't getting
- * used in parallel.
- */
- mutex_lock(&opp_table->genpd_virt_dev_lock);
- _detach_genpd(opp_table);
- mutex_unlock(&opp_table->genpd_virt_dev_lock);
- }
- static void _opp_clear_config(struct opp_config_data *data)
- {
- if (data->flags & OPP_CONFIG_GENPD)
- _opp_detach_genpd(data->opp_table);
- if (data->flags & OPP_CONFIG_REGULATOR)
- _opp_put_regulators(data->opp_table);
- if (data->flags & OPP_CONFIG_SUPPORTED_HW)
- _opp_put_supported_hw(data->opp_table);
- if (data->flags & OPP_CONFIG_REGULATOR_HELPER)
- _opp_put_config_regulators_helper(data->opp_table);
- if (data->flags & OPP_CONFIG_PROP_NAME)
- _opp_put_prop_name(data->opp_table);
- if (data->flags & OPP_CONFIG_CLK)
- _opp_put_clknames(data->opp_table);
- dev_pm_opp_put_opp_table(data->opp_table);
- kfree(data);
- }
- /**
- * dev_pm_opp_set_config() - Set OPP configuration for the device.
- * @dev: Device for which configuration is being set.
- * @config: OPP configuration.
- *
- * This allows all device OPP configurations to be performed at once.
- *
- * This must be called before any OPPs are initialized for the device. This may
- * be called multiple times for the same OPP table, for example once for each
- * CPU that share the same table. This must be balanced by the same number of
- * calls to dev_pm_opp_clear_config() in order to free the OPP table properly.
- *
- * This returns a token to the caller, which must be passed to
- * dev_pm_opp_clear_config() to free the resources later. The value of the
- * returned token will be >= 1 for success and negative for errors. The minimum
- * value of 1 is chosen here to make it easy for callers to manage the resource.
- */
- int dev_pm_opp_set_config(struct device *dev, struct dev_pm_opp_config *config)
- {
- struct opp_table *opp_table;
- struct opp_config_data *data;
- unsigned int id;
- int ret;
- data = kmalloc(sizeof(*data), GFP_KERNEL);
- if (!data)
- return -ENOMEM;
- opp_table = _add_opp_table(dev, false);
- if (IS_ERR(opp_table)) {
- kfree(data);
- return PTR_ERR(opp_table);
- }
- data->opp_table = opp_table;
- data->flags = 0;
- /* This should be called before OPPs are initialized */
- if (WARN_ON(!list_empty(&opp_table->opp_list))) {
- ret = -EBUSY;
- goto err;
- }
- /* Configure clocks */
- if (config->clk_names) {
- ret = _opp_set_clknames(opp_table, dev, config->clk_names,
- config->config_clks);
- if (ret)
- goto err;
- data->flags |= OPP_CONFIG_CLK;
- } else if (config->config_clks) {
- /* Don't allow config callback without clocks */
- ret = -EINVAL;
- goto err;
- }
- /* Configure property names */
- if (config->prop_name) {
- ret = _opp_set_prop_name(opp_table, config->prop_name);
- if (ret)
- goto err;
- data->flags |= OPP_CONFIG_PROP_NAME;
- }
- /* Configure config_regulators helper */
- if (config->config_regulators) {
- ret = _opp_set_config_regulators_helper(opp_table, dev,
- config->config_regulators);
- if (ret)
- goto err;
- data->flags |= OPP_CONFIG_REGULATOR_HELPER;
- }
- /* Configure supported hardware */
- if (config->supported_hw) {
- ret = _opp_set_supported_hw(opp_table, config->supported_hw,
- config->supported_hw_count);
- if (ret)
- goto err;
- data->flags |= OPP_CONFIG_SUPPORTED_HW;
- }
- /* Configure supplies */
- if (config->regulator_names) {
- ret = _opp_set_regulators(opp_table, dev,
- config->regulator_names);
- if (ret)
- goto err;
- data->flags |= OPP_CONFIG_REGULATOR;
- }
- /* Attach genpds */
- if (config->genpd_names) {
- ret = _opp_attach_genpd(opp_table, dev, config->genpd_names,
- config->virt_devs);
- if (ret)
- goto err;
- data->flags |= OPP_CONFIG_GENPD;
- }
- ret = xa_alloc(&opp_configs, &id, data, XA_LIMIT(1, INT_MAX),
- GFP_KERNEL);
- if (ret)
- goto err;
- return id;
- err:
- _opp_clear_config(data);
- return ret;
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_set_config);
- /**
- * dev_pm_opp_clear_config() - Releases resources blocked for OPP configuration.
- * @opp_table: OPP table returned from dev_pm_opp_set_config().
- *
- * This allows all device OPP configurations to be cleared at once. This must be
- * called once for each call made to dev_pm_opp_set_config(), in order to free
- * the OPPs properly.
- *
- * Currently the first call itself ends up freeing all the OPP configurations,
- * while the later ones only drop the OPP table reference. This works well for
- * now as we would never want to use an half initialized OPP table and want to
- * remove the configurations together.
- */
- void dev_pm_opp_clear_config(int token)
- {
- struct opp_config_data *data;
- /*
- * This lets the callers call this unconditionally and keep their code
- * simple.
- */
- if (unlikely(token <= 0))
- return;
- data = xa_erase(&opp_configs, token);
- if (WARN_ON(!data))
- return;
- _opp_clear_config(data);
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_clear_config);
- static void devm_pm_opp_config_release(void *token)
- {
- dev_pm_opp_clear_config((unsigned long)token);
- }
- /**
- * devm_pm_opp_set_config() - Set OPP configuration for the device.
- * @dev: Device for which configuration is being set.
- * @config: OPP configuration.
- *
- * This allows all device OPP configurations to be performed at once.
- * This is a resource-managed variant of dev_pm_opp_set_config().
- *
- * Return: 0 on success and errorno otherwise.
- */
- int devm_pm_opp_set_config(struct device *dev, struct dev_pm_opp_config *config)
- {
- int token = dev_pm_opp_set_config(dev, config);
- if (token < 0)
- return token;
- return devm_add_action_or_reset(dev, devm_pm_opp_config_release,
- (void *) ((unsigned long) token));
- }
- EXPORT_SYMBOL_GPL(devm_pm_opp_set_config);
- /**
- * dev_pm_opp_xlate_required_opp() - Find required OPP for @src_table OPP.
- * @src_table: OPP table which has @dst_table as one of its required OPP table.
- * @dst_table: Required OPP table of the @src_table.
- * @src_opp: OPP from the @src_table.
- *
- * This function returns the OPP (present in @dst_table) pointed out by the
- * "required-opps" property of the @src_opp (present in @src_table).
- *
- * The callers are required to call dev_pm_opp_put() for the returned OPP after
- * use.
- *
- * Return: pointer to 'struct dev_pm_opp' on success and errorno otherwise.
- */
- struct dev_pm_opp *dev_pm_opp_xlate_required_opp(struct opp_table *src_table,
- struct opp_table *dst_table,
- struct dev_pm_opp *src_opp)
- {
- struct dev_pm_opp *opp, *dest_opp = ERR_PTR(-ENODEV);
- int i;
- if (!src_table || !dst_table || !src_opp ||
- !src_table->required_opp_tables)
- return ERR_PTR(-EINVAL);
- /* required-opps not fully initialized yet */
- if (lazy_linking_pending(src_table))
- return ERR_PTR(-EBUSY);
- for (i = 0; i < src_table->required_opp_count; i++) {
- if (src_table->required_opp_tables[i] == dst_table) {
- mutex_lock(&src_table->lock);
- list_for_each_entry(opp, &src_table->opp_list, node) {
- if (opp == src_opp) {
- dest_opp = opp->required_opps[i];
- dev_pm_opp_get(dest_opp);
- break;
- }
- }
- mutex_unlock(&src_table->lock);
- break;
- }
- }
- if (IS_ERR(dest_opp)) {
- pr_err("%s: Couldn't find matching OPP (%p: %p)\n", __func__,
- src_table, dst_table);
- }
- return dest_opp;
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_xlate_required_opp);
- /**
- * dev_pm_opp_xlate_performance_state() - Find required OPP's pstate for src_table.
- * @src_table: OPP table which has dst_table as one of its required OPP table.
- * @dst_table: Required OPP table of the src_table.
- * @pstate: Current performance state of the src_table.
- *
- * This Returns pstate of the OPP (present in @dst_table) pointed out by the
- * "required-opps" property of the OPP (present in @src_table) which has
- * performance state set to @pstate.
- *
- * Return: Zero or positive performance state on success, otherwise negative
- * value on errors.
- */
- int dev_pm_opp_xlate_performance_state(struct opp_table *src_table,
- struct opp_table *dst_table,
- unsigned int pstate)
- {
- struct dev_pm_opp *opp;
- int dest_pstate = -EINVAL;
- int i;
- /*
- * Normally the src_table will have the "required_opps" property set to
- * point to one of the OPPs in the dst_table, but in some cases the
- * genpd and its master have one to one mapping of performance states
- * and so none of them have the "required-opps" property set. Return the
- * pstate of the src_table as it is in such cases.
- */
- if (!src_table || !src_table->required_opp_count)
- return pstate;
- /* required-opps not fully initialized yet */
- if (lazy_linking_pending(src_table))
- return -EBUSY;
- for (i = 0; i < src_table->required_opp_count; i++) {
- if (src_table->required_opp_tables[i]->np == dst_table->np)
- break;
- }
- if (unlikely(i == src_table->required_opp_count)) {
- pr_err("%s: Couldn't find matching OPP table (%p: %p)\n",
- __func__, src_table, dst_table);
- return -EINVAL;
- }
- mutex_lock(&src_table->lock);
- list_for_each_entry(opp, &src_table->opp_list, node) {
- if (opp->pstate == pstate) {
- dest_pstate = opp->required_opps[i]->pstate;
- goto unlock;
- }
- }
- pr_err("%s: Couldn't find matching OPP (%p: %p)\n", __func__, src_table,
- dst_table);
- unlock:
- mutex_unlock(&src_table->lock);
- return dest_pstate;
- }
- /**
- * dev_pm_opp_add() - Add an OPP table from a table definitions
- * @dev: device for which we do this operation
- * @freq: Frequency in Hz for this OPP
- * @u_volt: Voltage in uVolts for this OPP
- *
- * This function adds an opp definition to the opp table and returns status.
- * The opp is made available by default and it can be controlled using
- * dev_pm_opp_enable/disable functions.
- *
- * Return:
- * 0 On success OR
- * Duplicate OPPs (both freq and volt are same) and opp->available
- * -EEXIST Freq are same and volt are different OR
- * Duplicate OPPs (both freq and volt are same) and !opp->available
- * -ENOMEM Memory allocation failure
- */
- int dev_pm_opp_add(struct device *dev, unsigned long freq, unsigned long u_volt)
- {
- struct opp_table *opp_table;
- int ret;
- opp_table = _add_opp_table(dev, true);
- if (IS_ERR(opp_table))
- return PTR_ERR(opp_table);
- /* Fix regulator count for dynamic OPPs */
- opp_table->regulator_count = 1;
- ret = _opp_add_v1(opp_table, dev, freq, u_volt, true);
- if (ret)
- dev_pm_opp_put_opp_table(opp_table);
- return ret;
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_add);
- /**
- * _opp_set_availability() - helper to set the availability of an opp
- * @dev: device for which we do this operation
- * @freq: OPP frequency to modify availability
- * @availability_req: availability status requested for this opp
- *
- * Set the availability of an OPP, opp_{enable,disable} share a common logic
- * which is isolated here.
- *
- * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the
- * copy operation, returns 0 if no modification was done OR modification was
- * successful.
- */
- static int _opp_set_availability(struct device *dev, unsigned long freq,
- bool availability_req)
- {
- struct opp_table *opp_table;
- struct dev_pm_opp *tmp_opp, *opp = ERR_PTR(-ENODEV);
- int r = 0;
- /* Find the opp_table */
- opp_table = _find_opp_table(dev);
- if (IS_ERR(opp_table)) {
- r = PTR_ERR(opp_table);
- dev_warn(dev, "%s: Device OPP not found (%d)\n", __func__, r);
- return r;
- }
- if (!assert_single_clk(opp_table)) {
- r = -EINVAL;
- goto put_table;
- }
- mutex_lock(&opp_table->lock);
- /* Do we have the frequency? */
- list_for_each_entry(tmp_opp, &opp_table->opp_list, node) {
- if (tmp_opp->rates[0] == freq) {
- opp = tmp_opp;
- break;
- }
- }
- if (IS_ERR(opp)) {
- r = PTR_ERR(opp);
- goto unlock;
- }
- /* Is update really needed? */
- if (opp->available == availability_req)
- goto unlock;
- opp->available = availability_req;
- dev_pm_opp_get(opp);
- mutex_unlock(&opp_table->lock);
- /* Notify the change of the OPP availability */
- if (availability_req)
- blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ENABLE,
- opp);
- else
- blocking_notifier_call_chain(&opp_table->head,
- OPP_EVENT_DISABLE, opp);
- dev_pm_opp_put(opp);
- goto put_table;
- unlock:
- mutex_unlock(&opp_table->lock);
- put_table:
- dev_pm_opp_put_opp_table(opp_table);
- return r;
- }
- /**
- * dev_pm_opp_adjust_voltage() - helper to change the voltage of an OPP
- * @dev: device for which we do this operation
- * @freq: OPP frequency to adjust voltage of
- * @u_volt: new OPP target voltage
- * @u_volt_min: new OPP min voltage
- * @u_volt_max: new OPP max voltage
- *
- * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the
- * copy operation, returns 0 if no modifcation was done OR modification was
- * successful.
- */
- int dev_pm_opp_adjust_voltage(struct device *dev, unsigned long freq,
- unsigned long u_volt, unsigned long u_volt_min,
- unsigned long u_volt_max)
- {
- struct opp_table *opp_table;
- struct dev_pm_opp *tmp_opp, *opp = ERR_PTR(-ENODEV);
- int r = 0;
- /* Find the opp_table */
- opp_table = _find_opp_table(dev);
- if (IS_ERR(opp_table)) {
- r = PTR_ERR(opp_table);
- dev_warn(dev, "%s: Device OPP not found (%d)\n", __func__, r);
- return r;
- }
- if (!assert_single_clk(opp_table)) {
- r = -EINVAL;
- goto put_table;
- }
- mutex_lock(&opp_table->lock);
- /* Do we have the frequency? */
- list_for_each_entry(tmp_opp, &opp_table->opp_list, node) {
- if (tmp_opp->rates[0] == freq) {
- opp = tmp_opp;
- break;
- }
- }
- if (IS_ERR(opp)) {
- r = PTR_ERR(opp);
- goto adjust_unlock;
- }
- /* Is update really needed? */
- if (opp->supplies->u_volt == u_volt)
- goto adjust_unlock;
- opp->supplies->u_volt = u_volt;
- opp->supplies->u_volt_min = u_volt_min;
- opp->supplies->u_volt_max = u_volt_max;
- dev_pm_opp_get(opp);
- mutex_unlock(&opp_table->lock);
- /* Notify the voltage change of the OPP */
- blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ADJUST_VOLTAGE,
- opp);
- dev_pm_opp_put(opp);
- goto put_table;
- adjust_unlock:
- mutex_unlock(&opp_table->lock);
- put_table:
- dev_pm_opp_put_opp_table(opp_table);
- return r;
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_adjust_voltage);
- /**
- * dev_pm_opp_enable() - Enable a specific OPP
- * @dev: device for which we do this operation
- * @freq: OPP frequency to enable
- *
- * Enables a provided opp. If the operation is valid, this returns 0, else the
- * corresponding error value. It is meant to be used for users an OPP available
- * after being temporarily made unavailable with dev_pm_opp_disable.
- *
- * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the
- * copy operation, returns 0 if no modification was done OR modification was
- * successful.
- */
- int dev_pm_opp_enable(struct device *dev, unsigned long freq)
- {
- return _opp_set_availability(dev, freq, true);
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_enable);
- /**
- * dev_pm_opp_disable() - Disable a specific OPP
- * @dev: device for which we do this operation
- * @freq: OPP frequency to disable
- *
- * Disables a provided opp. If the operation is valid, this returns
- * 0, else the corresponding error value. It is meant to be a temporary
- * control by users to make this OPP not available until the circumstances are
- * right to make it available again (with a call to dev_pm_opp_enable).
- *
- * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the
- * copy operation, returns 0 if no modification was done OR modification was
- * successful.
- */
- int dev_pm_opp_disable(struct device *dev, unsigned long freq)
- {
- return _opp_set_availability(dev, freq, false);
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_disable);
- /**
- * dev_pm_opp_register_notifier() - Register OPP notifier for the device
- * @dev: Device for which notifier needs to be registered
- * @nb: Notifier block to be registered
- *
- * Return: 0 on success or a negative error value.
- */
- int dev_pm_opp_register_notifier(struct device *dev, struct notifier_block *nb)
- {
- struct opp_table *opp_table;
- int ret;
- opp_table = _find_opp_table(dev);
- if (IS_ERR(opp_table))
- return PTR_ERR(opp_table);
- ret = blocking_notifier_chain_register(&opp_table->head, nb);
- dev_pm_opp_put_opp_table(opp_table);
- return ret;
- }
- EXPORT_SYMBOL(dev_pm_opp_register_notifier);
- /**
- * dev_pm_opp_unregister_notifier() - Unregister OPP notifier for the device
- * @dev: Device for which notifier needs to be unregistered
- * @nb: Notifier block to be unregistered
- *
- * Return: 0 on success or a negative error value.
- */
- int dev_pm_opp_unregister_notifier(struct device *dev,
- struct notifier_block *nb)
- {
- struct opp_table *opp_table;
- int ret;
- opp_table = _find_opp_table(dev);
- if (IS_ERR(opp_table))
- return PTR_ERR(opp_table);
- ret = blocking_notifier_chain_unregister(&opp_table->head, nb);
- dev_pm_opp_put_opp_table(opp_table);
- return ret;
- }
- EXPORT_SYMBOL(dev_pm_opp_unregister_notifier);
- /**
- * dev_pm_opp_remove_table() - Free all OPPs associated with the device
- * @dev: device pointer used to lookup OPP table.
- *
- * Free both OPPs created using static entries present in DT and the
- * dynamically added entries.
- */
- void dev_pm_opp_remove_table(struct device *dev)
- {
- struct opp_table *opp_table;
- /* Check for existing table for 'dev' */
- opp_table = _find_opp_table(dev);
- if (IS_ERR(opp_table)) {
- int error = PTR_ERR(opp_table);
- if (error != -ENODEV)
- WARN(1, "%s: opp_table: %d\n",
- IS_ERR_OR_NULL(dev) ?
- "Invalid device" : dev_name(dev),
- error);
- return;
- }
- /*
- * Drop the extra reference only if the OPP table was successfully added
- * with dev_pm_opp_of_add_table() earlier.
- **/
- if (_opp_remove_all_static(opp_table))
- dev_pm_opp_put_opp_table(opp_table);
- /* Drop reference taken by _find_opp_table() */
- dev_pm_opp_put_opp_table(opp_table);
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_remove_table);
- /**
- * dev_pm_opp_sync_regulators() - Sync state of voltage regulators
- * @dev: device for which we do this operation
- *
- * Sync voltage state of the OPP table regulators.
- *
- * Return: 0 on success or a negative error value.
- */
- int dev_pm_opp_sync_regulators(struct device *dev)
- {
- struct opp_table *opp_table;
- struct regulator *reg;
- int i, ret = 0;
- /* Device may not have OPP table */
- opp_table = _find_opp_table(dev);
- if (IS_ERR(opp_table))
- return 0;
- /* Regulator may not be required for the device */
- if (unlikely(!opp_table->regulators))
- goto put_table;
- /* Nothing to sync if voltage wasn't changed */
- if (!opp_table->enabled)
- goto put_table;
- for (i = 0; i < opp_table->regulator_count; i++) {
- reg = opp_table->regulators[i];
- ret = regulator_sync_voltage(reg);
- if (ret)
- break;
- }
- put_table:
- /* Drop reference taken by _find_opp_table() */
- dev_pm_opp_put_opp_table(opp_table);
- return ret;
- }
- EXPORT_SYMBOL_GPL(dev_pm_opp_sync_regulators);
|