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1// SPDX-License-Identifier: GPL-2.02/*3 * OMAP SmartReflex Voltage Control4 *5 * Author: Thara Gopinath <thara@ti.com>6 *7 * Copyright (C) 2012 Texas Instruments, Inc.8 * Thara Gopinath <thara@ti.com>9 *10 * Copyright (C) 2008 Nokia Corporation11 * Kalle Jokiniemi12 *13 * Copyright (C) 2007 Texas Instruments, Inc.14 * Lesly A M <x0080970@ti.com>15 */16 17#include <linux/module.h>18#include <linux/mod_devicetable.h>19#include <linux/interrupt.h>20#include <linux/clk.h>21#include <linux/io.h>22#include <linux/debugfs.h>23#include <linux/delay.h>24#include <linux/slab.h>25#include <linux/pm_runtime.h>26#include <linux/power/smartreflex.h>27 28#define DRIVER_NAME "smartreflex"29#define SMARTREFLEX_NAME_LEN 3230#define NVALUE_NAME_LEN 4031#define SR_DISABLE_TIMEOUT 20032 33/* sr_list contains all the instances of smartreflex module */34static LIST_HEAD(sr_list);35 36static struct omap_sr_class_data *sr_class;37static struct dentry *sr_dbg_dir;38 39static inline void sr_write_reg(struct omap_sr *sr, unsigned offset, u32 value)40{41 __raw_writel(value, (sr->base + offset));42}43 44static inline void sr_modify_reg(struct omap_sr *sr, unsigned offset, u32 mask,45 u32 value)46{47 u32 reg_val;48 49 /*50 * Smartreflex error config register is special as it contains51 * certain status bits which if written a 1 into means a clear52 * of those bits. So in order to make sure no accidental write of53 * 1 happens to those status bits, do a clear of them in the read54 * value. This mean this API doesn't rewrite values in these bits55 * if they are currently set, but does allow the caller to write56 * those bits.57 */58 if (sr->ip_type == SR_TYPE_V1 && offset == ERRCONFIG_V1)59 mask |= ERRCONFIG_STATUS_V1_MASK;60 else if (sr->ip_type == SR_TYPE_V2 && offset == ERRCONFIG_V2)61 mask |= ERRCONFIG_VPBOUNDINTST_V2;62 63 reg_val = __raw_readl(sr->base + offset);64 reg_val &= ~mask;65 66 value &= mask;67 68 reg_val |= value;69 70 __raw_writel(reg_val, (sr->base + offset));71}72 73static inline u32 sr_read_reg(struct omap_sr *sr, unsigned offset)74{75 return __raw_readl(sr->base + offset);76}77 78static struct omap_sr *_sr_lookup(struct voltagedomain *voltdm)79{80 struct omap_sr *sr_info;81 82 if (!voltdm) {83 pr_err("%s: Null voltage domain passed!\n", __func__);84 return ERR_PTR(-EINVAL);85 }86 87 list_for_each_entry(sr_info, &sr_list, node) {88 if (voltdm == sr_info->voltdm)89 return sr_info;90 }91 92 return ERR_PTR(-ENODATA);93}94 95static irqreturn_t sr_interrupt(int irq, void *data)96{97 struct omap_sr *sr_info = data;98 u32 status = 0;99 100 switch (sr_info->ip_type) {101 case SR_TYPE_V1:102 /* Read the status bits */103 status = sr_read_reg(sr_info, ERRCONFIG_V1);104 105 /* Clear them by writing back */106 sr_write_reg(sr_info, ERRCONFIG_V1, status);107 break;108 case SR_TYPE_V2:109 /* Read the status bits */110 status = sr_read_reg(sr_info, IRQSTATUS);111 112 /* Clear them by writing back */113 sr_write_reg(sr_info, IRQSTATUS, status);114 break;115 default:116 dev_err(&sr_info->pdev->dev, "UNKNOWN IP type %d\n",117 sr_info->ip_type);118 return IRQ_NONE;119 }120 121 if (sr_class->notify)122 sr_class->notify(sr_info, status);123 124 return IRQ_HANDLED;125}126 127static void sr_set_clk_length(struct omap_sr *sr)128{129 u32 fclk_speed;130 131 /* Try interconnect target module fck first if it already exists */132 if (IS_ERR(sr->fck))133 return;134 135 fclk_speed = clk_get_rate(sr->fck);136 137 switch (fclk_speed) {138 case 12000000:139 sr->clk_length = SRCLKLENGTH_12MHZ_SYSCLK;140 break;141 case 13000000:142 sr->clk_length = SRCLKLENGTH_13MHZ_SYSCLK;143 break;144 case 19200000:145 sr->clk_length = SRCLKLENGTH_19MHZ_SYSCLK;146 break;147 case 26000000:148 sr->clk_length = SRCLKLENGTH_26MHZ_SYSCLK;149 break;150 case 38400000:151 sr->clk_length = SRCLKLENGTH_38MHZ_SYSCLK;152 break;153 default:154 dev_err(&sr->pdev->dev, "%s: Invalid fclk rate: %d\n",155 __func__, fclk_speed);156 break;157 }158}159 160static void sr_start_vddautocomp(struct omap_sr *sr)161{162 if (!sr_class || !(sr_class->enable) || !(sr_class->configure)) {163 dev_warn(&sr->pdev->dev,164 "%s: smartreflex class driver not registered\n",165 __func__);166 return;167 }168 169 if (!sr_class->enable(sr))170 sr->autocomp_active = true;171}172 173static void sr_stop_vddautocomp(struct omap_sr *sr)174{175 if (!sr_class || !(sr_class->disable)) {176 dev_warn(&sr->pdev->dev,177 "%s: smartreflex class driver not registered\n",178 __func__);179 return;180 }181 182 if (sr->autocomp_active) {183 sr_class->disable(sr, 1);184 sr->autocomp_active = false;185 }186}187 188/*189 * This function handles the initializations which have to be done190 * only when both sr device and class driver regiter has191 * completed. This will be attempted to be called from both sr class192 * driver register and sr device intializtion API's. Only one call193 * will ultimately succeed.194 *195 * Currently this function registers interrupt handler for a particular SR196 * if smartreflex class driver is already registered and has197 * requested for interrupts and the SR interrupt line in present.198 */199static int sr_late_init(struct omap_sr *sr_info)200{201 int ret = 0;202 203 if (sr_class->notify && sr_class->notify_flags && sr_info->irq) {204 ret = devm_request_irq(&sr_info->pdev->dev, sr_info->irq,205 sr_interrupt, 0, sr_info->name, sr_info);206 if (ret)207 goto error;208 disable_irq(sr_info->irq);209 }210 211 return ret;212 213error:214 list_del(&sr_info->node);215 dev_err(&sr_info->pdev->dev, "%s: ERROR in registering interrupt handler. Smartreflex will not function as desired\n",216 __func__);217 218 return ret;219}220 221static void sr_v1_disable(struct omap_sr *sr)222{223 int timeout = 0;224 int errconf_val = ERRCONFIG_MCUACCUMINTST | ERRCONFIG_MCUVALIDINTST |225 ERRCONFIG_MCUBOUNDINTST;226 227 /* Enable MCUDisableAcknowledge interrupt */228 sr_modify_reg(sr, ERRCONFIG_V1,229 ERRCONFIG_MCUDISACKINTEN, ERRCONFIG_MCUDISACKINTEN);230 231 /* SRCONFIG - disable SR */232 sr_modify_reg(sr, SRCONFIG, SRCONFIG_SRENABLE, 0x0);233 234 /* Disable all other SR interrupts and clear the status as needed */235 if (sr_read_reg(sr, ERRCONFIG_V1) & ERRCONFIG_VPBOUNDINTST_V1)236 errconf_val |= ERRCONFIG_VPBOUNDINTST_V1;237 sr_modify_reg(sr, ERRCONFIG_V1,238 (ERRCONFIG_MCUACCUMINTEN | ERRCONFIG_MCUVALIDINTEN |239 ERRCONFIG_MCUBOUNDINTEN | ERRCONFIG_VPBOUNDINTEN_V1),240 errconf_val);241 242 /*243 * Wait for SR to be disabled.244 * wait until ERRCONFIG.MCUDISACKINTST = 1. Typical latency is 1us.245 */246 sr_test_cond_timeout((sr_read_reg(sr, ERRCONFIG_V1) &247 ERRCONFIG_MCUDISACKINTST), SR_DISABLE_TIMEOUT,248 timeout);249 250 if (timeout >= SR_DISABLE_TIMEOUT)251 dev_warn(&sr->pdev->dev, "%s: Smartreflex disable timedout\n",252 __func__);253 254 /* Disable MCUDisableAcknowledge interrupt & clear pending interrupt */255 sr_modify_reg(sr, ERRCONFIG_V1, ERRCONFIG_MCUDISACKINTEN,256 ERRCONFIG_MCUDISACKINTST);257}258 259static void sr_v2_disable(struct omap_sr *sr)260{261 int timeout = 0;262 263 /* Enable MCUDisableAcknowledge interrupt */264 sr_write_reg(sr, IRQENABLE_SET, IRQENABLE_MCUDISABLEACKINT);265 266 /* SRCONFIG - disable SR */267 sr_modify_reg(sr, SRCONFIG, SRCONFIG_SRENABLE, 0x0);268 269 /*270 * Disable all other SR interrupts and clear the status271 * write to status register ONLY on need basis - only if status272 * is set.273 */274 if (sr_read_reg(sr, ERRCONFIG_V2) & ERRCONFIG_VPBOUNDINTST_V2)275 sr_modify_reg(sr, ERRCONFIG_V2, ERRCONFIG_VPBOUNDINTEN_V2,276 ERRCONFIG_VPBOUNDINTST_V2);277 else278 sr_modify_reg(sr, ERRCONFIG_V2, ERRCONFIG_VPBOUNDINTEN_V2,279 0x0);280 sr_write_reg(sr, IRQENABLE_CLR, (IRQENABLE_MCUACCUMINT |281 IRQENABLE_MCUVALIDINT |282 IRQENABLE_MCUBOUNDSINT));283 sr_write_reg(sr, IRQSTATUS, (IRQSTATUS_MCUACCUMINT |284 IRQSTATUS_MCVALIDINT |285 IRQSTATUS_MCBOUNDSINT));286 287 /*288 * Wait for SR to be disabled.289 * wait until IRQSTATUS.MCUDISACKINTST = 1. Typical latency is 1us.290 */291 sr_test_cond_timeout((sr_read_reg(sr, IRQSTATUS) &292 IRQSTATUS_MCUDISABLEACKINT), SR_DISABLE_TIMEOUT,293 timeout);294 295 if (timeout >= SR_DISABLE_TIMEOUT)296 dev_warn(&sr->pdev->dev, "%s: Smartreflex disable timedout\n",297 __func__);298 299 /* Disable MCUDisableAcknowledge interrupt & clear pending interrupt */300 sr_write_reg(sr, IRQENABLE_CLR, IRQENABLE_MCUDISABLEACKINT);301 sr_write_reg(sr, IRQSTATUS, IRQSTATUS_MCUDISABLEACKINT);302}303 304static struct omap_sr_nvalue_table *sr_retrieve_nvalue_row(305 struct omap_sr *sr, u32 efuse_offs)306{307 int i;308 309 if (!sr->nvalue_table) {310 dev_warn(&sr->pdev->dev, "%s: Missing ntarget value table\n",311 __func__);312 return NULL;313 }314 315 for (i = 0; i < sr->nvalue_count; i++) {316 if (sr->nvalue_table[i].efuse_offs == efuse_offs)317 return &sr->nvalue_table[i];318 }319 320 return NULL;321}322 323/* Public Functions */324 325/**326 * sr_configure_errgen() - Configures the SmartReflex to perform AVS using the327 * error generator module.328 * @sr: SR module to be configured.329 *330 * This API is to be called from the smartreflex class driver to331 * configure the error generator module inside the smartreflex module.332 * SR settings if using the ERROR module inside Smartreflex.333 * SR CLASS 3 by default uses only the ERROR module where as334 * SR CLASS 2 can choose between ERROR module and MINMAXAVG335 * module. Returns 0 on success and error value in case of failure.336 */337int sr_configure_errgen(struct omap_sr *sr)338{339 u32 sr_config, sr_errconfig, errconfig_offs;340 u32 vpboundint_en, vpboundint_st;341 u32 senp_en = 0, senn_en = 0;342 u8 senp_shift, senn_shift;343 344 if (!sr) {345 pr_warn("%s: NULL omap_sr from %pS\n",346 __func__, (void *)_RET_IP_);347 return -EINVAL;348 }349 350 if (!sr->clk_length)351 sr_set_clk_length(sr);352 353 senp_en = sr->senp_mod;354 senn_en = sr->senn_mod;355 356 sr_config = (sr->clk_length << SRCONFIG_SRCLKLENGTH_SHIFT) |357 SRCONFIG_SENENABLE | SRCONFIG_ERRGEN_EN;358 359 switch (sr->ip_type) {360 case SR_TYPE_V1:361 sr_config |= SRCONFIG_DELAYCTRL;362 senn_shift = SRCONFIG_SENNENABLE_V1_SHIFT;363 senp_shift = SRCONFIG_SENPENABLE_V1_SHIFT;364 errconfig_offs = ERRCONFIG_V1;365 vpboundint_en = ERRCONFIG_VPBOUNDINTEN_V1;366 vpboundint_st = ERRCONFIG_VPBOUNDINTST_V1;367 break;368 case SR_TYPE_V2:369 senn_shift = SRCONFIG_SENNENABLE_V2_SHIFT;370 senp_shift = SRCONFIG_SENPENABLE_V2_SHIFT;371 errconfig_offs = ERRCONFIG_V2;372 vpboundint_en = ERRCONFIG_VPBOUNDINTEN_V2;373 vpboundint_st = ERRCONFIG_VPBOUNDINTST_V2;374 break;375 default:376 dev_err(&sr->pdev->dev, "%s: Trying to Configure smartreflex module without specifying the ip\n",377 __func__);378 return -EINVAL;379 }380 381 sr_config |= ((senn_en << senn_shift) | (senp_en << senp_shift));382 sr_write_reg(sr, SRCONFIG, sr_config);383 sr_errconfig = (sr->err_weight << ERRCONFIG_ERRWEIGHT_SHIFT) |384 (sr->err_maxlimit << ERRCONFIG_ERRMAXLIMIT_SHIFT) |385 (sr->err_minlimit << ERRCONFIG_ERRMINLIMIT_SHIFT);386 sr_modify_reg(sr, errconfig_offs, (SR_ERRWEIGHT_MASK |387 SR_ERRMAXLIMIT_MASK | SR_ERRMINLIMIT_MASK),388 sr_errconfig);389 390 /* Enabling the interrupts if the ERROR module is used */391 sr_modify_reg(sr, errconfig_offs, (vpboundint_en | vpboundint_st),392 vpboundint_en);393 394 return 0;395}396 397/**398 * sr_disable_errgen() - Disables SmartReflex AVS module's errgen component399 * @sr: SR module to be configured.400 *401 * This API is to be called from the smartreflex class driver to402 * disable the error generator module inside the smartreflex module.403 *404 * Returns 0 on success and error value in case of failure.405 */406int sr_disable_errgen(struct omap_sr *sr)407{408 u32 errconfig_offs;409 u32 vpboundint_en, vpboundint_st;410 411 if (!sr) {412 pr_warn("%s: NULL omap_sr from %pS\n",413 __func__, (void *)_RET_IP_);414 return -EINVAL;415 }416 417 switch (sr->ip_type) {418 case SR_TYPE_V1:419 errconfig_offs = ERRCONFIG_V1;420 vpboundint_en = ERRCONFIG_VPBOUNDINTEN_V1;421 vpboundint_st = ERRCONFIG_VPBOUNDINTST_V1;422 break;423 case SR_TYPE_V2:424 errconfig_offs = ERRCONFIG_V2;425 vpboundint_en = ERRCONFIG_VPBOUNDINTEN_V2;426 vpboundint_st = ERRCONFIG_VPBOUNDINTST_V2;427 break;428 default:429 dev_err(&sr->pdev->dev, "%s: Trying to Configure smartreflex module without specifying the ip\n",430 __func__);431 return -EINVAL;432 }433 434 /* Disable the Sensor and errorgen */435 sr_modify_reg(sr, SRCONFIG, SRCONFIG_SENENABLE | SRCONFIG_ERRGEN_EN, 0);436 437 /*438 * Disable the interrupts of ERROR module439 * NOTE: modify is a read, modify,write - an implicit OCP barrier440 * which is required is present here - sequencing is critical441 * at this point (after errgen is disabled, vpboundint disable)442 */443 sr_modify_reg(sr, errconfig_offs, vpboundint_en | vpboundint_st, 0);444 445 return 0;446}447 448/**449 * sr_configure_minmax() - Configures the SmartReflex to perform AVS using the450 * minmaxavg module.451 * @sr: SR module to be configured.452 *453 * This API is to be called from the smartreflex class driver to454 * configure the minmaxavg module inside the smartreflex module.455 * SR settings if using the ERROR module inside Smartreflex.456 * SR CLASS 3 by default uses only the ERROR module where as457 * SR CLASS 2 can choose between ERROR module and MINMAXAVG458 * module. Returns 0 on success and error value in case of failure.459 */460int sr_configure_minmax(struct omap_sr *sr)461{462 u32 sr_config, sr_avgwt;463 u32 senp_en = 0, senn_en = 0;464 u8 senp_shift, senn_shift;465 466 if (!sr) {467 pr_warn("%s: NULL omap_sr from %pS\n",468 __func__, (void *)_RET_IP_);469 return -EINVAL;470 }471 472 if (!sr->clk_length)473 sr_set_clk_length(sr);474 475 senp_en = sr->senp_mod;476 senn_en = sr->senn_mod;477 478 sr_config = (sr->clk_length << SRCONFIG_SRCLKLENGTH_SHIFT) |479 SRCONFIG_SENENABLE |480 (sr->accum_data << SRCONFIG_ACCUMDATA_SHIFT);481 482 switch (sr->ip_type) {483 case SR_TYPE_V1:484 sr_config |= SRCONFIG_DELAYCTRL;485 senn_shift = SRCONFIG_SENNENABLE_V1_SHIFT;486 senp_shift = SRCONFIG_SENPENABLE_V1_SHIFT;487 break;488 case SR_TYPE_V2:489 senn_shift = SRCONFIG_SENNENABLE_V2_SHIFT;490 senp_shift = SRCONFIG_SENPENABLE_V2_SHIFT;491 break;492 default:493 dev_err(&sr->pdev->dev, "%s: Trying to Configure smartreflex module without specifying the ip\n",494 __func__);495 return -EINVAL;496 }497 498 sr_config |= ((senn_en << senn_shift) | (senp_en << senp_shift));499 sr_write_reg(sr, SRCONFIG, sr_config);500 sr_avgwt = (sr->senp_avgweight << AVGWEIGHT_SENPAVGWEIGHT_SHIFT) |501 (sr->senn_avgweight << AVGWEIGHT_SENNAVGWEIGHT_SHIFT);502 sr_write_reg(sr, AVGWEIGHT, sr_avgwt);503 504 /*505 * Enabling the interrupts if MINMAXAVG module is used.506 * TODO: check if all the interrupts are mandatory507 */508 switch (sr->ip_type) {509 case SR_TYPE_V1:510 sr_modify_reg(sr, ERRCONFIG_V1,511 (ERRCONFIG_MCUACCUMINTEN | ERRCONFIG_MCUVALIDINTEN |512 ERRCONFIG_MCUBOUNDINTEN),513 (ERRCONFIG_MCUACCUMINTEN | ERRCONFIG_MCUACCUMINTST |514 ERRCONFIG_MCUVALIDINTEN | ERRCONFIG_MCUVALIDINTST |515 ERRCONFIG_MCUBOUNDINTEN | ERRCONFIG_MCUBOUNDINTST));516 break;517 case SR_TYPE_V2:518 sr_write_reg(sr, IRQSTATUS,519 IRQSTATUS_MCUACCUMINT | IRQSTATUS_MCVALIDINT |520 IRQSTATUS_MCBOUNDSINT | IRQSTATUS_MCUDISABLEACKINT);521 sr_write_reg(sr, IRQENABLE_SET,522 IRQENABLE_MCUACCUMINT | IRQENABLE_MCUVALIDINT |523 IRQENABLE_MCUBOUNDSINT | IRQENABLE_MCUDISABLEACKINT);524 break;525 default:526 dev_err(&sr->pdev->dev, "%s: Trying to Configure smartreflex module without specifying the ip\n",527 __func__);528 return -EINVAL;529 }530 531 return 0;532}533 534/**535 * sr_enable() - Enables the smartreflex module.536 * @sr: pointer to which the SR module to be configured belongs to.537 * @volt: The voltage at which the Voltage domain associated with538 * the smartreflex module is operating at.539 * This is required only to program the correct Ntarget value.540 *541 * This API is to be called from the smartreflex class driver to542 * enable a smartreflex module. Returns 0 on success. Returns error543 * value if the voltage passed is wrong or if ntarget value is wrong.544 */545int sr_enable(struct omap_sr *sr, unsigned long volt)546{547 struct omap_volt_data *volt_data;548 struct omap_sr_nvalue_table *nvalue_row;549 int ret;550 551 if (!sr) {552 pr_warn("%s: NULL omap_sr from %pS\n",553 __func__, (void *)_RET_IP_);554 return -EINVAL;555 }556 557 volt_data = omap_voltage_get_voltdata(sr->voltdm, volt);558 559 if (IS_ERR(volt_data)) {560 dev_warn(&sr->pdev->dev, "%s: Unable to get voltage table for nominal voltage %ld\n",561 __func__, volt);562 return PTR_ERR(volt_data);563 }564 565 nvalue_row = sr_retrieve_nvalue_row(sr, volt_data->sr_efuse_offs);566 567 if (!nvalue_row) {568 dev_warn(&sr->pdev->dev, "%s: failure getting SR data for this voltage %ld\n",569 __func__, volt);570 return -ENODATA;571 }572 573 /* errminlimit is opp dependent and hence linked to voltage */574 sr->err_minlimit = nvalue_row->errminlimit;575 576 clk_enable(sr->fck);577 578 /* Check if SR is already enabled. If yes do nothing */579 if (sr_read_reg(sr, SRCONFIG) & SRCONFIG_SRENABLE)580 goto out_enabled;581 582 /* Configure SR */583 ret = sr_class->configure(sr);584 if (ret)585 goto out_enabled;586 587 sr_write_reg(sr, NVALUERECIPROCAL, nvalue_row->nvalue);588 589 /* SRCONFIG - enable SR */590 sr_modify_reg(sr, SRCONFIG, SRCONFIG_SRENABLE, SRCONFIG_SRENABLE);591 592out_enabled:593 sr->enabled = 1;594 595 return 0;596}597 598/**599 * sr_disable() - Disables the smartreflex module.600 * @sr: pointer to which the SR module to be configured belongs to.601 *602 * This API is to be called from the smartreflex class driver to603 * disable a smartreflex module.604 */605void sr_disable(struct omap_sr *sr)606{607 if (!sr) {608 pr_warn("%s: NULL omap_sr from %pS\n",609 __func__, (void *)_RET_IP_);610 return;611 }612 613 /* Check if SR clocks are already disabled. If yes do nothing */614 if (!sr->enabled)615 return;616 617 /*618 * Disable SR if only it is indeed enabled. Else just619 * disable the clocks.620 */621 if (sr_read_reg(sr, SRCONFIG) & SRCONFIG_SRENABLE) {622 switch (sr->ip_type) {623 case SR_TYPE_V1:624 sr_v1_disable(sr);625 break;626 case SR_TYPE_V2:627 sr_v2_disable(sr);628 break;629 default:630 dev_err(&sr->pdev->dev, "UNKNOWN IP type %d\n",631 sr->ip_type);632 }633 }634 635 clk_disable(sr->fck);636 sr->enabled = 0;637}638 639/**640 * sr_register_class() - API to register a smartreflex class parameters.641 * @class_data: The structure containing various sr class specific data.642 *643 * This API is to be called by the smartreflex class driver to register itself644 * with the smartreflex driver during init. Returns 0 on success else the645 * error value.646 */647int sr_register_class(struct omap_sr_class_data *class_data)648{649 struct omap_sr *sr_info;650 651 if (!class_data) {652 pr_warn("%s:, Smartreflex class data passed is NULL\n",653 __func__);654 return -EINVAL;655 }656 657 if (sr_class) {658 pr_warn("%s: Smartreflex class driver already registered\n",659 __func__);660 return -EBUSY;661 }662 663 sr_class = class_data;664 665 /*666 * Call into late init to do initializations that require667 * both sr driver and sr class driver to be initiallized.668 */669 list_for_each_entry(sr_info, &sr_list, node)670 sr_late_init(sr_info);671 672 return 0;673}674 675/**676 * omap_sr_enable() - API to enable SR clocks and to call into the677 * registered smartreflex class enable API.678 * @voltdm: VDD pointer to which the SR module to be configured belongs to.679 *680 * This API is to be called from the kernel in order to enable681 * a particular smartreflex module. This API will do the initial682 * configurations to turn on the smartreflex module and in turn call683 * into the registered smartreflex class enable API.684 */685void omap_sr_enable(struct voltagedomain *voltdm)686{687 struct omap_sr *sr = _sr_lookup(voltdm);688 689 if (IS_ERR(sr)) {690 pr_warn("%s: omap_sr struct for voltdm not found\n", __func__);691 return;692 }693 694 if (!sr->autocomp_active)695 return;696 697 if (!sr_class || !(sr_class->enable) || !(sr_class->configure)) {698 dev_warn(&sr->pdev->dev, "%s: smartreflex class driver not registered\n",699 __func__);700 return;701 }702 703 sr_class->enable(sr);704}705 706/**707 * omap_sr_disable() - API to disable SR without resetting the voltage708 * processor voltage709 * @voltdm: VDD pointer to which the SR module to be configured belongs to.710 *711 * This API is to be called from the kernel in order to disable712 * a particular smartreflex module. This API will in turn call713 * into the registered smartreflex class disable API. This API will tell714 * the smartreflex class disable not to reset the VP voltage after715 * disabling smartreflex.716 */717void omap_sr_disable(struct voltagedomain *voltdm)718{719 struct omap_sr *sr = _sr_lookup(voltdm);720 721 if (IS_ERR(sr)) {722 pr_warn("%s: omap_sr struct for voltdm not found\n", __func__);723 return;724 }725 726 if (!sr->autocomp_active)727 return;728 729 if (!sr_class || !(sr_class->disable)) {730 dev_warn(&sr->pdev->dev, "%s: smartreflex class driver not registered\n",731 __func__);732 return;733 }734 735 sr_class->disable(sr, 0);736}737 738/**739 * omap_sr_disable_reset_volt() - API to disable SR and reset the740 * voltage processor voltage741 * @voltdm: VDD pointer to which the SR module to be configured belongs to.742 *743 * This API is to be called from the kernel in order to disable744 * a particular smartreflex module. This API will in turn call745 * into the registered smartreflex class disable API. This API will tell746 * the smartreflex class disable to reset the VP voltage after747 * disabling smartreflex.748 */749void omap_sr_disable_reset_volt(struct voltagedomain *voltdm)750{751 struct omap_sr *sr = _sr_lookup(voltdm);752 753 if (IS_ERR(sr)) {754 pr_warn("%s: omap_sr struct for voltdm not found\n", __func__);755 return;756 }757 758 if (!sr->autocomp_active)759 return;760 761 if (!sr_class || !(sr_class->disable)) {762 dev_warn(&sr->pdev->dev, "%s: smartreflex class driver not registered\n",763 __func__);764 return;765 }766 767 sr_class->disable(sr, 1);768}769 770/* PM Debug FS entries to enable and disable smartreflex. */771static int omap_sr_autocomp_show(void *data, u64 *val)772{773 struct omap_sr *sr_info = data;774 775 if (!sr_info) {776 pr_warn("%s: omap_sr struct not found\n", __func__);777 return -EINVAL;778 }779 780 *val = sr_info->autocomp_active;781 782 return 0;783}784 785static int omap_sr_autocomp_store(void *data, u64 val)786{787 struct omap_sr *sr_info = data;788 789 if (!sr_info) {790 pr_warn("%s: omap_sr struct not found\n", __func__);791 return -EINVAL;792 }793 794 /* Sanity check */795 if (val > 1) {796 pr_warn("%s: Invalid argument %lld\n", __func__, val);797 return -EINVAL;798 }799 800 /* control enable/disable only if there is a delta in value */801 if (sr_info->autocomp_active != val) {802 if (!val)803 sr_stop_vddautocomp(sr_info);804 else805 sr_start_vddautocomp(sr_info);806 }807 808 return 0;809}810 811DEFINE_SIMPLE_ATTRIBUTE(pm_sr_fops, omap_sr_autocomp_show,812 omap_sr_autocomp_store, "%llu\n");813 814static int omap_sr_probe(struct platform_device *pdev)815{816 struct omap_sr *sr_info;817 struct omap_sr_data *pdata = pdev->dev.platform_data;818 struct dentry *nvalue_dir;819 int i, ret = 0;820 821 sr_info = devm_kzalloc(&pdev->dev, sizeof(struct omap_sr), GFP_KERNEL);822 if (!sr_info)823 return -ENOMEM;824 825 sr_info->name = devm_kzalloc(&pdev->dev,826 SMARTREFLEX_NAME_LEN, GFP_KERNEL);827 if (!sr_info->name)828 return -ENOMEM;829 830 platform_set_drvdata(pdev, sr_info);831 832 if (!pdata) {833 dev_err(&pdev->dev, "%s: platform data missing\n", __func__);834 return -EINVAL;835 }836 837 sr_info->base = devm_platform_ioremap_resource(pdev, 0);838 if (IS_ERR(sr_info->base))839 return PTR_ERR(sr_info->base);840 841 ret = platform_get_irq_optional(pdev, 0);842 if (ret < 0 && ret != -ENXIO)843 return dev_err_probe(&pdev->dev, ret, "failed to get IRQ resource\n");844 if (ret > 0)845 sr_info->irq = ret;846 847 sr_info->fck = devm_clk_get(pdev->dev.parent, "fck");848 if (IS_ERR(sr_info->fck))849 return PTR_ERR(sr_info->fck);850 clk_prepare(sr_info->fck);851 852 pm_runtime_enable(&pdev->dev);853 854 snprintf(sr_info->name, SMARTREFLEX_NAME_LEN, "%s", pdata->name);855 856 sr_info->pdev = pdev;857 sr_info->srid = pdev->id;858 sr_info->voltdm = pdata->voltdm;859 sr_info->nvalue_table = pdata->nvalue_table;860 sr_info->nvalue_count = pdata->nvalue_count;861 sr_info->senn_mod = pdata->senn_mod;862 sr_info->senp_mod = pdata->senp_mod;863 sr_info->err_weight = pdata->err_weight;864 sr_info->err_maxlimit = pdata->err_maxlimit;865 sr_info->accum_data = pdata->accum_data;866 sr_info->senn_avgweight = pdata->senn_avgweight;867 sr_info->senp_avgweight = pdata->senp_avgweight;868 sr_info->autocomp_active = false;869 sr_info->ip_type = pdata->ip_type;870 871 sr_set_clk_length(sr_info);872 873 list_add(&sr_info->node, &sr_list);874 875 /*876 * Call into late init to do initializations that require877 * both sr driver and sr class driver to be initiallized.878 */879 if (sr_class) {880 ret = sr_late_init(sr_info);881 if (ret) {882 pr_warn("%s: Error in SR late init\n", __func__);883 goto err_list_del;884 }885 }886 887 dev_info(&pdev->dev, "%s: SmartReflex driver initialized\n", __func__);888 if (!sr_dbg_dir)889 sr_dbg_dir = debugfs_create_dir("smartreflex", NULL);890 891 sr_info->dbg_dir = debugfs_create_dir(sr_info->name, sr_dbg_dir);892 893 debugfs_create_file("autocomp", S_IRUGO | S_IWUSR, sr_info->dbg_dir,894 sr_info, &pm_sr_fops);895 debugfs_create_x32("errweight", S_IRUGO, sr_info->dbg_dir,896 &sr_info->err_weight);897 debugfs_create_x32("errmaxlimit", S_IRUGO, sr_info->dbg_dir,898 &sr_info->err_maxlimit);899 900 nvalue_dir = debugfs_create_dir("nvalue", sr_info->dbg_dir);901 902 if (sr_info->nvalue_count == 0 || !sr_info->nvalue_table) {903 dev_warn(&pdev->dev, "%s: %s: No Voltage table for the corresponding vdd. Cannot create debugfs entries for n-values\n",904 __func__, sr_info->name);905 906 ret = -ENODATA;907 goto err_debugfs;908 }909 910 for (i = 0; i < sr_info->nvalue_count; i++) {911 char name[NVALUE_NAME_LEN + 1];912 913 snprintf(name, sizeof(name), "volt_%lu",914 sr_info->nvalue_table[i].volt_nominal);915 debugfs_create_x32(name, S_IRUGO | S_IWUSR, nvalue_dir,916 &(sr_info->nvalue_table[i].nvalue));917 snprintf(name, sizeof(name), "errminlimit_%lu",918 sr_info->nvalue_table[i].volt_nominal);919 debugfs_create_x32(name, S_IRUGO | S_IWUSR, nvalue_dir,920 &(sr_info->nvalue_table[i].errminlimit));921 922 }923 924 return 0;925 926err_debugfs:927 debugfs_remove_recursive(sr_info->dbg_dir);928err_list_del:929 pm_runtime_disable(&pdev->dev);930 list_del(&sr_info->node);931 clk_unprepare(sr_info->fck);932 933 return ret;934}935 936static void omap_sr_remove(struct platform_device *pdev)937{938 struct device *dev = &pdev->dev;939 struct omap_sr *sr_info = platform_get_drvdata(pdev);940 941 if (sr_info->autocomp_active)942 sr_stop_vddautocomp(sr_info);943 debugfs_remove_recursive(sr_info->dbg_dir);944 945 pm_runtime_disable(dev);946 clk_unprepare(sr_info->fck);947 list_del(&sr_info->node);948}949 950static void omap_sr_shutdown(struct platform_device *pdev)951{952 struct omap_sr *sr_info = platform_get_drvdata(pdev);953 954 if (sr_info->autocomp_active)955 sr_stop_vddautocomp(sr_info);956 957 return;958}959 960static const struct of_device_id omap_sr_match[] = {961 { .compatible = "ti,omap3-smartreflex-core", },962 { .compatible = "ti,omap3-smartreflex-mpu-iva", },963 { .compatible = "ti,omap4-smartreflex-core", },964 { .compatible = "ti,omap4-smartreflex-mpu", },965 { .compatible = "ti,omap4-smartreflex-iva", },966 { },967};968MODULE_DEVICE_TABLE(of, omap_sr_match);969 970static struct platform_driver smartreflex_driver = {971 .probe = omap_sr_probe,972 .remove_new = omap_sr_remove,973 .shutdown = omap_sr_shutdown,974 .driver = {975 .name = DRIVER_NAME,976 .of_match_table = omap_sr_match,977 },978};979 980static int __init sr_init(void)981{982 int ret = 0;983 984 ret = platform_driver_register(&smartreflex_driver);985 if (ret) {986 pr_err("%s: platform driver register failed for SR\n",987 __func__);988 return ret;989 }990 991 return 0;992}993late_initcall(sr_init);994 995static void __exit sr_exit(void)996{997 platform_driver_unregister(&smartreflex_driver);998}999module_exit(sr_exit);1000 1001MODULE_DESCRIPTION("OMAP Smartreflex Driver");1002MODULE_LICENSE("GPL");1003MODULE_ALIAS("platform:" DRIVER_NAME);1004MODULE_AUTHOR("Texas Instruments Inc");1005