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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Texas Instruments SoC Adaptive Body Bias(ABB) Regulator4 *5 * Copyright (C) 2011 Texas Instruments, Inc.6 * Mike Turquette <mturquette@ti.com>7 *8 * Copyright (C) 2012-2013 Texas Instruments, Inc.9 * Andrii Tseglytskyi <andrii.tseglytskyi@ti.com>10 * Nishanth Menon <nm@ti.com>11 */12#include <linux/clk.h>13#include <linux/delay.h>14#include <linux/err.h>15#include <linux/io.h>16#include <linux/module.h>17#include <linux/of.h>18#include <linux/platform_device.h>19#include <linux/regulator/driver.h>20#include <linux/regulator/machine.h>21#include <linux/regulator/of_regulator.h>22 23/*24 * ABB LDO operating states:25 * NOMINAL_OPP: bypasses the ABB LDO26 * FAST_OPP: sets ABB LDO to Forward Body-Bias27 * SLOW_OPP: sets ABB LDO to Reverse Body-Bias28 */29#define TI_ABB_NOMINAL_OPP 030#define TI_ABB_FAST_OPP 131#define TI_ABB_SLOW_OPP 332 33/**34 * struct ti_abb_info - ABB information per voltage setting35 * @opp_sel: one of TI_ABB macro36 * @vset: (optional) vset value that LDOVBB needs to be overridden with.37 *38 * Array of per voltage entries organized in the same order as regulator_desc's39 * volt_table list. (selector is used to index from this array)40 */41struct ti_abb_info {42 u32 opp_sel;43 u32 vset;44};45 46/**47 * struct ti_abb_reg - Register description for ABB block48 * @setup_off: setup register offset from base49 * @control_off: control register offset from base50 * @sr2_wtcnt_value_mask: setup register- sr2_wtcnt_value mask51 * @fbb_sel_mask: setup register- FBB sel mask52 * @rbb_sel_mask: setup register- RBB sel mask53 * @sr2_en_mask: setup register- enable mask54 * @opp_change_mask: control register - mask to trigger LDOVBB change55 * @opp_sel_mask: control register - mask for mode to operate56 */57struct ti_abb_reg {58 u32 setup_off;59 u32 control_off;60 61 /* Setup register fields */62 u32 sr2_wtcnt_value_mask;63 u32 fbb_sel_mask;64 u32 rbb_sel_mask;65 u32 sr2_en_mask;66 67 /* Control register fields */68 u32 opp_change_mask;69 u32 opp_sel_mask;70};71 72/**73 * struct ti_abb - ABB instance data74 * @rdesc: regulator descriptor75 * @clk: clock(usually sysclk) supplying ABB block76 * @base: base address of ABB block77 * @setup_reg: setup register of ABB block78 * @control_reg: control register of ABB block79 * @int_base: interrupt register base address80 * @efuse_base: (optional) efuse base address for ABB modes81 * @ldo_base: (optional) LDOVBB vset override base address82 * @regs: pointer to struct ti_abb_reg for ABB block83 * @txdone_mask: mask on int_base for tranxdone interrupt84 * @ldovbb_override_mask: mask to ldo_base for overriding default LDO VBB85 * vset with value from efuse86 * @ldovbb_vset_mask: mask to ldo_base for providing the VSET override87 * @info: array to per voltage ABB configuration88 * @current_info_idx: current index to info89 * @settling_time: SoC specific settling time for LDO VBB90 */91struct ti_abb {92 struct regulator_desc rdesc;93 struct clk *clk;94 void __iomem *base;95 void __iomem *setup_reg;96 void __iomem *control_reg;97 void __iomem *int_base;98 void __iomem *efuse_base;99 void __iomem *ldo_base;100 101 const struct ti_abb_reg *regs;102 u32 txdone_mask;103 u32 ldovbb_override_mask;104 u32 ldovbb_vset_mask;105 106 struct ti_abb_info *info;107 int current_info_idx;108 109 u32 settling_time;110};111 112/**113 * ti_abb_rmw() - handy wrapper to set specific register bits114 * @mask: mask for register field115 * @value: value shifted to mask location and written116 * @reg: register address117 *118 * Return: final register value (may be unused)119 */120static inline u32 ti_abb_rmw(u32 mask, u32 value, void __iomem *reg)121{122 u32 val;123 124 val = readl(reg);125 val &= ~mask;126 val |= (value << __ffs(mask)) & mask;127 writel(val, reg);128 129 return val;130}131 132/**133 * ti_abb_check_txdone() - handy wrapper to check ABB tranxdone status134 * @abb: pointer to the abb instance135 *136 * Return: true or false137 */138static inline bool ti_abb_check_txdone(const struct ti_abb *abb)139{140 return !!(readl(abb->int_base) & abb->txdone_mask);141}142 143/**144 * ti_abb_clear_txdone() - handy wrapper to clear ABB tranxdone status145 * @abb: pointer to the abb instance146 */147static inline void ti_abb_clear_txdone(const struct ti_abb *abb)148{149 writel(abb->txdone_mask, abb->int_base);150};151 152/**153 * ti_abb_wait_txdone() - waits for ABB tranxdone event154 * @dev: device155 * @abb: pointer to the abb instance156 *157 * Return: 0 on success or -ETIMEDOUT if the event is not cleared on time.158 */159static int ti_abb_wait_txdone(struct device *dev, struct ti_abb *abb)160{161 int timeout = 0;162 bool status;163 164 while (timeout++ <= abb->settling_time) {165 status = ti_abb_check_txdone(abb);166 if (status)167 return 0;168 169 udelay(1);170 }171 172 dev_warn_ratelimited(dev, "%s:TRANXDONE timeout(%duS) int=0x%08x\n",173 __func__, timeout, readl(abb->int_base));174 return -ETIMEDOUT;175}176 177/**178 * ti_abb_clear_all_txdone() - clears ABB tranxdone event179 * @dev: device180 * @abb: pointer to the abb instance181 *182 * Return: 0 on success or -ETIMEDOUT if the event is not cleared on time.183 */184static int ti_abb_clear_all_txdone(struct device *dev, const struct ti_abb *abb)185{186 int timeout = 0;187 bool status;188 189 while (timeout++ <= abb->settling_time) {190 ti_abb_clear_txdone(abb);191 192 status = ti_abb_check_txdone(abb);193 if (!status)194 return 0;195 196 udelay(1);197 }198 199 dev_warn_ratelimited(dev, "%s:TRANXDONE timeout(%duS) int=0x%08x\n",200 __func__, timeout, readl(abb->int_base));201 return -ETIMEDOUT;202}203 204/**205 * ti_abb_program_ldovbb() - program LDOVBB register for override value206 * @dev: device207 * @abb: pointer to the abb instance208 * @info: ABB info to program209 */210static void ti_abb_program_ldovbb(struct device *dev, const struct ti_abb *abb,211 struct ti_abb_info *info)212{213 u32 val;214 215 val = readl(abb->ldo_base);216 /* clear up previous values */217 val &= ~(abb->ldovbb_override_mask | abb->ldovbb_vset_mask);218 219 switch (info->opp_sel) {220 case TI_ABB_SLOW_OPP:221 case TI_ABB_FAST_OPP:222 val |= abb->ldovbb_override_mask;223 val |= info->vset << __ffs(abb->ldovbb_vset_mask);224 break;225 }226 227 writel(val, abb->ldo_base);228}229 230/**231 * ti_abb_set_opp() - Setup ABB and LDO VBB for required bias232 * @rdev: regulator device233 * @abb: pointer to the abb instance234 * @info: ABB info to program235 *236 * Return: 0 on success or appropriate error value when fails237 */238static int ti_abb_set_opp(struct regulator_dev *rdev, struct ti_abb *abb,239 struct ti_abb_info *info)240{241 const struct ti_abb_reg *regs = abb->regs;242 struct device *dev = &rdev->dev;243 int ret;244 245 ret = ti_abb_clear_all_txdone(dev, abb);246 if (ret)247 goto out;248 249 ti_abb_rmw(regs->fbb_sel_mask | regs->rbb_sel_mask, 0, abb->setup_reg);250 251 switch (info->opp_sel) {252 case TI_ABB_SLOW_OPP:253 ti_abb_rmw(regs->rbb_sel_mask, 1, abb->setup_reg);254 break;255 case TI_ABB_FAST_OPP:256 ti_abb_rmw(regs->fbb_sel_mask, 1, abb->setup_reg);257 break;258 }259 260 /* program next state of ABB ldo */261 ti_abb_rmw(regs->opp_sel_mask, info->opp_sel, abb->control_reg);262 263 /*264 * program LDO VBB vset override if needed for !bypass mode265 * XXX: Do not switch sequence - for !bypass, LDO override reset *must*266 * be performed *before* switch to bias mode else VBB glitches.267 */268 if (abb->ldo_base && info->opp_sel != TI_ABB_NOMINAL_OPP)269 ti_abb_program_ldovbb(dev, abb, info);270 271 /* Initiate ABB ldo change */272 ti_abb_rmw(regs->opp_change_mask, 1, abb->control_reg);273 274 /* Wait for ABB LDO to complete transition to new Bias setting */275 ret = ti_abb_wait_txdone(dev, abb);276 if (ret)277 goto out;278 279 ret = ti_abb_clear_all_txdone(dev, abb);280 if (ret)281 goto out;282 283 /*284 * Reset LDO VBB vset override bypass mode285 * XXX: Do not switch sequence - for bypass, LDO override reset *must*286 * be performed *after* switch to bypass else VBB glitches.287 */288 if (abb->ldo_base && info->opp_sel == TI_ABB_NOMINAL_OPP)289 ti_abb_program_ldovbb(dev, abb, info);290 291out:292 return ret;293}294 295/**296 * ti_abb_set_voltage_sel() - regulator accessor function to set ABB LDO297 * @rdev: regulator device298 * @sel: selector to index into required ABB LDO settings (maps to299 * regulator descriptor's volt_table)300 *301 * Return: 0 on success or appropriate error value when fails302 */303static int ti_abb_set_voltage_sel(struct regulator_dev *rdev, unsigned int sel)304{305 const struct regulator_desc *desc = rdev->desc;306 struct ti_abb *abb = rdev_get_drvdata(rdev);307 struct device *dev = &rdev->dev;308 struct ti_abb_info *info, *oinfo;309 int ret = 0;310 311 if (!abb) {312 dev_err_ratelimited(dev, "%s: No regulator drvdata\n",313 __func__);314 return -ENODEV;315 }316 317 if (!desc->n_voltages || !abb->info) {318 dev_err_ratelimited(dev,319 "%s: No valid voltage table entries?\n",320 __func__);321 return -EINVAL;322 }323 324 if (sel >= desc->n_voltages) {325 dev_err(dev, "%s: sel idx(%d) >= n_voltages(%d)\n", __func__,326 sel, desc->n_voltages);327 return -EINVAL;328 }329 330 /* If we are in the same index as we were, nothing to do here! */331 if (sel == abb->current_info_idx) {332 dev_dbg(dev, "%s: Already at sel=%d\n", __func__, sel);333 return ret;334 }335 336 info = &abb->info[sel];337 /*338 * When Linux kernel is starting up, we aren't sure of the339 * Bias configuration that bootloader has configured.340 * So, we get to know the actual setting the first time341 * we are asked to transition.342 */343 if (abb->current_info_idx == -EINVAL)344 goto just_set_abb;345 346 /* If data is exactly the same, then just update index, no change */347 oinfo = &abb->info[abb->current_info_idx];348 if (!memcmp(info, oinfo, sizeof(*info))) {349 dev_dbg(dev, "%s: Same data new idx=%d, old idx=%d\n", __func__,350 sel, abb->current_info_idx);351 goto out;352 }353 354just_set_abb:355 ret = ti_abb_set_opp(rdev, abb, info);356 357out:358 if (!ret)359 abb->current_info_idx = sel;360 else361 dev_err_ratelimited(dev,362 "%s: Volt[%d] idx[%d] mode[%d] Fail(%d)\n",363 __func__, desc->volt_table[sel], sel,364 info->opp_sel, ret);365 return ret;366}367 368/**369 * ti_abb_get_voltage_sel() - Regulator accessor to get current ABB LDO setting370 * @rdev: regulator device371 *372 * Return: 0 on success or appropriate error value when fails373 */374static int ti_abb_get_voltage_sel(struct regulator_dev *rdev)375{376 const struct regulator_desc *desc = rdev->desc;377 struct ti_abb *abb = rdev_get_drvdata(rdev);378 struct device *dev = &rdev->dev;379 380 if (!abb) {381 dev_err_ratelimited(dev, "%s: No regulator drvdata\n",382 __func__);383 return -ENODEV;384 }385 386 if (!desc->n_voltages || !abb->info) {387 dev_err_ratelimited(dev,388 "%s: No valid voltage table entries?\n",389 __func__);390 return -EINVAL;391 }392 393 if (abb->current_info_idx >= (int)desc->n_voltages) {394 dev_err(dev, "%s: Corrupted data? idx(%d) >= n_voltages(%d)\n",395 __func__, abb->current_info_idx, desc->n_voltages);396 return -EINVAL;397 }398 399 return abb->current_info_idx;400}401 402/**403 * ti_abb_init_timings() - setup ABB clock timing for the current platform404 * @dev: device405 * @abb: pointer to the abb instance406 *407 * Return: 0 if timing is updated, else returns error result.408 */409static int ti_abb_init_timings(struct device *dev, struct ti_abb *abb)410{411 u32 clock_cycles;412 u32 clk_rate, sr2_wt_cnt_val, cycle_rate;413 const struct ti_abb_reg *regs = abb->regs;414 int ret;415 char *pname = "ti,settling-time";416 417 /* read device tree properties */418 ret = of_property_read_u32(dev->of_node, pname, &abb->settling_time);419 if (ret) {420 dev_err(dev, "Unable to get property '%s'(%d)\n", pname, ret);421 return ret;422 }423 424 /* ABB LDO cannot be settle in 0 time */425 if (!abb->settling_time) {426 dev_err(dev, "Invalid property:'%s' set as 0!\n", pname);427 return -EINVAL;428 }429 430 pname = "ti,clock-cycles";431 ret = of_property_read_u32(dev->of_node, pname, &clock_cycles);432 if (ret) {433 dev_err(dev, "Unable to get property '%s'(%d)\n", pname, ret);434 return ret;435 }436 /* ABB LDO cannot be settle in 0 clock cycles */437 if (!clock_cycles) {438 dev_err(dev, "Invalid property:'%s' set as 0!\n", pname);439 return -EINVAL;440 }441 442 abb->clk = devm_clk_get(dev, NULL);443 if (IS_ERR(abb->clk)) {444 ret = PTR_ERR(abb->clk);445 dev_err(dev, "%s: Unable to get clk(%d)\n", __func__, ret);446 return ret;447 }448 449 /*450 * SR2_WTCNT_VALUE is the settling time for the ABB ldo after a451 * transition and must be programmed with the correct time at boot.452 * The value programmed into the register is the number of SYS_CLK453 * clock cycles that match a given wall time profiled for the ldo.454 * This value depends on:455 * settling time of ldo in micro-seconds (varies per OMAP family)456 * # of clock cycles per SYS_CLK period (varies per OMAP family)457 * the SYS_CLK frequency in MHz (varies per board)458 * The formula is:459 *460 * ldo settling time (in micro-seconds)461 * SR2_WTCNT_VALUE = ------------------------------------------462 * (# system clock cycles) * (sys_clk period)463 *464 * Put another way:465 *466 * SR2_WTCNT_VALUE = settling time / (# SYS_CLK cycles / SYS_CLK rate))467 *468 * To avoid dividing by zero multiply both "# clock cycles" and469 * "settling time" by 10 such that the final result is the one we want.470 */471 472 /* Convert SYS_CLK rate to MHz & prevent divide by zero */473 clk_rate = DIV_ROUND_CLOSEST(clk_get_rate(abb->clk), 1000000);474 475 /* Calculate cycle rate */476 cycle_rate = DIV_ROUND_CLOSEST(clock_cycles * 10, clk_rate);477 478 /* Calculate SR2_WTCNT_VALUE */479 sr2_wt_cnt_val = DIV_ROUND_CLOSEST(abb->settling_time * 10, cycle_rate);480 481 dev_dbg(dev, "%s: Clk_rate=%ld, sr2_cnt=0x%08x\n", __func__,482 clk_get_rate(abb->clk), sr2_wt_cnt_val);483 484 ti_abb_rmw(regs->sr2_wtcnt_value_mask, sr2_wt_cnt_val, abb->setup_reg);485 486 return 0;487}488 489/**490 * ti_abb_init_table() - Initialize ABB table from device tree491 * @dev: device492 * @abb: pointer to the abb instance493 * @rinit_data: regulator initdata494 *495 * Return: 0 on success or appropriate error value when fails496 */497static int ti_abb_init_table(struct device *dev, struct ti_abb *abb,498 struct regulator_init_data *rinit_data)499{500 struct ti_abb_info *info;501 const u32 num_values = 6;502 char *pname = "ti,abb_info";503 u32 i;504 unsigned int *volt_table;505 int num_entries, min_uV = INT_MAX, max_uV = 0;506 struct regulation_constraints *c = &rinit_data->constraints;507 508 /*509 * Each abb_info is a set of n-tuple, where n is num_values, consisting510 * of voltage and a set of detection logic for ABB information for that511 * voltage to apply.512 */513 num_entries = of_property_count_u32_elems(dev->of_node, pname);514 if (num_entries < 0) {515 dev_err(dev, "No '%s' property?\n", pname);516 return num_entries;517 }518 519 if (!num_entries || (num_entries % num_values)) {520 dev_err(dev, "All '%s' list entries need %d vals\n", pname,521 num_values);522 return -EINVAL;523 }524 num_entries /= num_values;525 526 info = devm_kcalloc(dev, num_entries, sizeof(*info), GFP_KERNEL);527 if (!info)528 return -ENOMEM;529 530 abb->info = info;531 532 volt_table = devm_kcalloc(dev, num_entries, sizeof(unsigned int),533 GFP_KERNEL);534 if (!volt_table)535 return -ENOMEM;536 537 abb->rdesc.n_voltages = num_entries;538 abb->rdesc.volt_table = volt_table;539 /* We do not know where the OPP voltage is at the moment */540 abb->current_info_idx = -EINVAL;541 542 for (i = 0; i < num_entries; i++, info++, volt_table++) {543 u32 efuse_offset, rbb_mask, fbb_mask, vset_mask;544 u32 efuse_val;545 546 /* NOTE: num_values should equal to entries picked up here */547 of_property_read_u32_index(dev->of_node, pname, i * num_values,548 volt_table);549 of_property_read_u32_index(dev->of_node, pname,550 i * num_values + 1, &info->opp_sel);551 of_property_read_u32_index(dev->of_node, pname,552 i * num_values + 2, &efuse_offset);553 of_property_read_u32_index(dev->of_node, pname,554 i * num_values + 3, &rbb_mask);555 of_property_read_u32_index(dev->of_node, pname,556 i * num_values + 4, &fbb_mask);557 of_property_read_u32_index(dev->of_node, pname,558 i * num_values + 5, &vset_mask);559 560 dev_dbg(dev,561 "[%d]v=%d ABB=%d ef=0x%x rbb=0x%x fbb=0x%x vset=0x%x\n",562 i, *volt_table, info->opp_sel, efuse_offset, rbb_mask,563 fbb_mask, vset_mask);564 565 /* Find min/max for voltage set */566 if (min_uV > *volt_table)567 min_uV = *volt_table;568 if (max_uV < *volt_table)569 max_uV = *volt_table;570 571 if (!abb->efuse_base) {572 /* Ignore invalid data, but warn to help cleanup */573 if (efuse_offset || rbb_mask || fbb_mask || vset_mask)574 dev_err(dev, "prop '%s': v=%d,bad efuse/mask\n",575 pname, *volt_table);576 goto check_abb;577 }578 579 efuse_val = readl(abb->efuse_base + efuse_offset);580 581 /* Use ABB recommendation from Efuse */582 if (efuse_val & rbb_mask)583 info->opp_sel = TI_ABB_SLOW_OPP;584 else if (efuse_val & fbb_mask)585 info->opp_sel = TI_ABB_FAST_OPP;586 else if (rbb_mask || fbb_mask)587 info->opp_sel = TI_ABB_NOMINAL_OPP;588 589 dev_dbg(dev,590 "[%d]v=%d efusev=0x%x final ABB=%d\n",591 i, *volt_table, efuse_val, info->opp_sel);592 593 /* Use recommended Vset bits from Efuse */594 if (!abb->ldo_base) {595 if (vset_mask)596 dev_err(dev, "prop'%s':v=%d vst=%x LDO base?\n",597 pname, *volt_table, vset_mask);598 continue;599 }600 info->vset = (efuse_val & vset_mask) >> __ffs(vset_mask);601 dev_dbg(dev, "[%d]v=%d vset=%x\n", i, *volt_table, info->vset);602check_abb:603 switch (info->opp_sel) {604 case TI_ABB_NOMINAL_OPP:605 case TI_ABB_FAST_OPP:606 case TI_ABB_SLOW_OPP:607 /* Valid values */608 break;609 default:610 dev_err(dev, "%s:[%d]v=%d, ABB=%d is invalid! Abort!\n",611 __func__, i, *volt_table, info->opp_sel);612 return -EINVAL;613 }614 }615 616 /* Setup the min/max voltage constraints from the supported list */617 c->min_uV = min_uV;618 c->max_uV = max_uV;619 620 return 0;621}622 623static const struct regulator_ops ti_abb_reg_ops = {624 .list_voltage = regulator_list_voltage_table,625 626 .set_voltage_sel = ti_abb_set_voltage_sel,627 .get_voltage_sel = ti_abb_get_voltage_sel,628};629 630/* Default ABB block offsets, IF this changes in future, create new one */631static const struct ti_abb_reg abb_regs_v1 = {632 /* WARNING: registers are wrongly documented in TRM */633 .setup_off = 0x04,634 .control_off = 0x00,635 636 .sr2_wtcnt_value_mask = (0xff << 8),637 .fbb_sel_mask = (0x01 << 2),638 .rbb_sel_mask = (0x01 << 1),639 .sr2_en_mask = (0x01 << 0),640 641 .opp_change_mask = (0x01 << 2),642 .opp_sel_mask = (0x03 << 0),643};644 645static const struct ti_abb_reg abb_regs_v2 = {646 .setup_off = 0x00,647 .control_off = 0x04,648 649 .sr2_wtcnt_value_mask = (0xff << 8),650 .fbb_sel_mask = (0x01 << 2),651 .rbb_sel_mask = (0x01 << 1),652 .sr2_en_mask = (0x01 << 0),653 654 .opp_change_mask = (0x01 << 2),655 .opp_sel_mask = (0x03 << 0),656};657 658static const struct ti_abb_reg abb_regs_generic = {659 .sr2_wtcnt_value_mask = (0xff << 8),660 .fbb_sel_mask = (0x01 << 2),661 .rbb_sel_mask = (0x01 << 1),662 .sr2_en_mask = (0x01 << 0),663 664 .opp_change_mask = (0x01 << 2),665 .opp_sel_mask = (0x03 << 0),666};667 668static const struct of_device_id ti_abb_of_match[] = {669 {.compatible = "ti,abb-v1", .data = &abb_regs_v1},670 {.compatible = "ti,abb-v2", .data = &abb_regs_v2},671 {.compatible = "ti,abb-v3", .data = &abb_regs_generic},672 { },673};674 675MODULE_DEVICE_TABLE(of, ti_abb_of_match);676 677/**678 * ti_abb_probe() - Initialize an ABB ldo instance679 * @pdev: ABB platform device680 *681 * Initializes an individual ABB LDO for required Body-Bias. ABB is used to682 * additional bias supply to SoC modules for power savings or mandatory stability683 * configuration at certain Operating Performance Points(OPPs).684 *685 * Return: 0 on success or appropriate error value when fails686 */687static int ti_abb_probe(struct platform_device *pdev)688{689 struct device *dev = &pdev->dev;690 struct resource *res;691 struct ti_abb *abb;692 struct regulator_init_data *initdata = NULL;693 struct regulator_dev *rdev = NULL;694 struct regulator_desc *desc;695 struct regulation_constraints *c;696 struct regulator_config config = { };697 char *pname;698 int ret = 0;699 700 abb = devm_kzalloc(dev, sizeof(struct ti_abb), GFP_KERNEL);701 if (!abb)702 return -ENOMEM;703 704 abb->regs = device_get_match_data(dev);705 if (!abb->regs) {706 dev_err(dev, "%s: Bad data in match\n", __func__);707 return -EINVAL;708 }709 710 /* Map ABB resources */711 if (abb->regs->setup_off || abb->regs->control_off) {712 abb->base = devm_platform_ioremap_resource_byname(pdev, "base-address");713 if (IS_ERR(abb->base))714 return PTR_ERR(abb->base);715 716 abb->setup_reg = abb->base + abb->regs->setup_off;717 abb->control_reg = abb->base + abb->regs->control_off;718 719 } else {720 abb->control_reg = devm_platform_ioremap_resource_byname(pdev, "control-address");721 if (IS_ERR(abb->control_reg))722 return PTR_ERR(abb->control_reg);723 724 abb->setup_reg = devm_platform_ioremap_resource_byname(pdev, "setup-address");725 if (IS_ERR(abb->setup_reg))726 return PTR_ERR(abb->setup_reg);727 }728 729 pname = "int-address";730 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, pname);731 if (!res) {732 dev_err(dev, "Missing '%s' IO resource\n", pname);733 return -ENODEV;734 }735 /*736 * The MPU interrupt status register (PRM_IRQSTATUS_MPU) is737 * shared between regulator-abb-{ivahd,dspeve,gpu} driver738 * instances. Therefore use devm_ioremap() rather than739 * devm_platform_ioremap_resource_byname() to avoid busy740 * resource region conflicts.741 */742 abb->int_base = devm_ioremap(dev, res->start,743 resource_size(res));744 if (!abb->int_base) {745 dev_err(dev, "Unable to map '%s'\n", pname);746 return -ENOMEM;747 }748 749 /* Map Optional resources */750 pname = "efuse-address";751 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, pname);752 if (!res) {753 dev_dbg(dev, "Missing '%s' IO resource\n", pname);754 ret = -ENODEV;755 goto skip_opt;756 }757 758 /*759 * We may have shared efuse register offsets which are read-only760 * between domains761 */762 abb->efuse_base = devm_ioremap(dev, res->start,763 resource_size(res));764 if (!abb->efuse_base) {765 dev_err(dev, "Unable to map '%s'\n", pname);766 return -ENOMEM;767 }768 769 pname = "ldo-address";770 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, pname);771 if (!res) {772 dev_dbg(dev, "Missing '%s' IO resource\n", pname);773 ret = -ENODEV;774 goto skip_opt;775 }776 abb->ldo_base = devm_ioremap_resource(dev, res);777 if (IS_ERR(abb->ldo_base))778 return PTR_ERR(abb->ldo_base);779 780 /* IF ldo_base is set, the following are mandatory */781 pname = "ti,ldovbb-override-mask";782 ret =783 of_property_read_u32(pdev->dev.of_node, pname,784 &abb->ldovbb_override_mask);785 if (ret) {786 dev_err(dev, "Missing '%s' (%d)\n", pname, ret);787 return ret;788 }789 if (!abb->ldovbb_override_mask) {790 dev_err(dev, "Invalid property:'%s' set as 0!\n", pname);791 return -EINVAL;792 }793 794 pname = "ti,ldovbb-vset-mask";795 ret =796 of_property_read_u32(pdev->dev.of_node, pname,797 &abb->ldovbb_vset_mask);798 if (ret) {799 dev_err(dev, "Missing '%s' (%d)\n", pname, ret);800 return ret;801 }802 if (!abb->ldovbb_vset_mask) {803 dev_err(dev, "Invalid property:'%s' set as 0!\n", pname);804 return -EINVAL;805 }806 807skip_opt:808 pname = "ti,tranxdone-status-mask";809 ret =810 of_property_read_u32(pdev->dev.of_node, pname,811 &abb->txdone_mask);812 if (ret) {813 dev_err(dev, "Missing '%s' (%d)\n", pname, ret);814 return ret;815 }816 if (!abb->txdone_mask) {817 dev_err(dev, "Invalid property:'%s' set as 0!\n", pname);818 return -EINVAL;819 }820 821 initdata = of_get_regulator_init_data(dev, pdev->dev.of_node,822 &abb->rdesc);823 if (!initdata) {824 dev_err(dev, "%s: Unable to alloc regulator init data\n",825 __func__);826 return -ENOMEM;827 }828 829 /* init ABB opp_sel table */830 ret = ti_abb_init_table(dev, abb, initdata);831 if (ret)832 return ret;833 834 /* init ABB timing */835 ret = ti_abb_init_timings(dev, abb);836 if (ret)837 return ret;838 839 desc = &abb->rdesc;840 desc->name = dev_name(dev);841 desc->owner = THIS_MODULE;842 desc->type = REGULATOR_VOLTAGE;843 desc->ops = &ti_abb_reg_ops;844 845 c = &initdata->constraints;846 if (desc->n_voltages > 1)847 c->valid_ops_mask |= REGULATOR_CHANGE_VOLTAGE;848 c->always_on = true;849 850 config.dev = dev;851 config.init_data = initdata;852 config.driver_data = abb;853 config.of_node = pdev->dev.of_node;854 855 rdev = devm_regulator_register(dev, desc, &config);856 if (IS_ERR(rdev)) {857 ret = PTR_ERR(rdev);858 dev_err(dev, "%s: failed to register regulator(%d)\n",859 __func__, ret);860 return ret;861 }862 platform_set_drvdata(pdev, rdev);863 864 /* Enable the ldo if not already done by bootloader */865 ti_abb_rmw(abb->regs->sr2_en_mask, 1, abb->setup_reg);866 867 return 0;868}869 870MODULE_ALIAS("platform:ti_abb");871 872static struct platform_driver ti_abb_driver = {873 .probe = ti_abb_probe,874 .driver = {875 .name = "ti_abb",876 .probe_type = PROBE_PREFER_ASYNCHRONOUS,877 .of_match_table = ti_abb_of_match,878 },879};880module_platform_driver(ti_abb_driver);881 882MODULE_DESCRIPTION("Texas Instruments ABB LDO regulator driver");883MODULE_AUTHOR("Texas Instruments Inc.");884MODULE_LICENSE("GPL v2");885