1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Intel pinctrl/GPIO core driver. 4 * 5 * Copyright (C) 2015, Intel Corporation 6 * Authors: Mathias Nyman <mathias.nyman@linux.intel.com> 7 * Mika Westerberg <mika.westerberg@linux.intel.com> 8 */ 9 10 #include <linux/module.h> 11 #include <linux/interrupt.h> 12 #include <linux/gpio/driver.h> 13 #include <linux/log2.h> 14 #include <linux/platform_device.h> 15 #include <linux/pinctrl/pinctrl.h> 16 #include <linux/pinctrl/pinmux.h> 17 #include <linux/pinctrl/pinconf.h> 18 #include <linux/pinctrl/pinconf-generic.h> 19 20 #include "../core.h" 21 #include "pinctrl-intel.h" 22 23 /* Offset from regs */ 24 #define REVID 0x000 25 #define REVID_SHIFT 16 26 #define REVID_MASK GENMASK(31, 16) 27 28 #define PADBAR 0x00c 29 #define GPI_IS 0x100 30 31 #define PADOWN_BITS 4 32 #define PADOWN_SHIFT(p) ((p) % 8 * PADOWN_BITS) 33 #define PADOWN_MASK(p) (0xf << PADOWN_SHIFT(p)) 34 #define PADOWN_GPP(p) ((p) / 8) 35 36 /* Offset from pad_regs */ 37 #define PADCFG0 0x000 38 #define PADCFG0_RXEVCFG_SHIFT 25 39 #define PADCFG0_RXEVCFG_MASK (3 << PADCFG0_RXEVCFG_SHIFT) 40 #define PADCFG0_RXEVCFG_LEVEL 0 41 #define PADCFG0_RXEVCFG_EDGE 1 42 #define PADCFG0_RXEVCFG_DISABLED 2 43 #define PADCFG0_RXEVCFG_EDGE_BOTH 3 44 #define PADCFG0_PREGFRXSEL BIT(24) 45 #define PADCFG0_RXINV BIT(23) 46 #define PADCFG0_GPIROUTIOXAPIC BIT(20) 47 #define PADCFG0_GPIROUTSCI BIT(19) 48 #define PADCFG0_GPIROUTSMI BIT(18) 49 #define PADCFG0_GPIROUTNMI BIT(17) 50 #define PADCFG0_PMODE_SHIFT 10 51 #define PADCFG0_PMODE_MASK (0xf << PADCFG0_PMODE_SHIFT) 52 #define PADCFG0_GPIORXDIS BIT(9) 53 #define PADCFG0_GPIOTXDIS BIT(8) 54 #define PADCFG0_GPIORXSTATE BIT(1) 55 #define PADCFG0_GPIOTXSTATE BIT(0) 56 57 #define PADCFG1 0x004 58 #define PADCFG1_TERM_UP BIT(13) 59 #define PADCFG1_TERM_SHIFT 10 60 #define PADCFG1_TERM_MASK (7 << PADCFG1_TERM_SHIFT) 61 #define PADCFG1_TERM_20K 4 62 #define PADCFG1_TERM_2K 3 63 #define PADCFG1_TERM_5K 2 64 #define PADCFG1_TERM_1K 1 65 66 #define PADCFG2 0x008 67 #define PADCFG2_DEBEN BIT(0) 68 #define PADCFG2_DEBOUNCE_SHIFT 1 69 #define PADCFG2_DEBOUNCE_MASK GENMASK(4, 1) 70 71 #define DEBOUNCE_PERIOD 31250 /* ns */ 72 73 struct intel_pad_context { 74 u32 padcfg0; 75 u32 padcfg1; 76 u32 padcfg2; 77 }; 78 79 struct intel_community_context { 80 u32 *intmask; 81 }; 82 83 struct intel_pinctrl_context { 84 struct intel_pad_context *pads; 85 struct intel_community_context *communities; 86 }; 87 88 /** 89 * struct intel_pinctrl - Intel pinctrl private structure 90 * @dev: Pointer to the device structure 91 * @lock: Lock to serialize register access 92 * @pctldesc: Pin controller description 93 * @pctldev: Pointer to the pin controller device 94 * @chip: GPIO chip in this pin controller 95 * @soc: SoC/PCH specific pin configuration data 96 * @communities: All communities in this pin controller 97 * @ncommunities: Number of communities in this pin controller 98 * @context: Configuration saved over system sleep 99 * @irq: pinctrl/GPIO chip irq number 100 */ 101 struct intel_pinctrl { 102 struct device *dev; 103 raw_spinlock_t lock; 104 struct pinctrl_desc pctldesc; 105 struct pinctrl_dev *pctldev; 106 struct gpio_chip chip; 107 const struct intel_pinctrl_soc_data *soc; 108 struct intel_community *communities; 109 size_t ncommunities; 110 struct intel_pinctrl_context context; 111 int irq; 112 }; 113 114 #define pin_to_padno(c, p) ((p) - (c)->pin_base) 115 #define padgroup_offset(g, p) ((p) - (g)->base) 116 117 static struct intel_community *intel_get_community(struct intel_pinctrl *pctrl, 118 unsigned pin) 119 { 120 struct intel_community *community; 121 int i; 122 123 for (i = 0; i < pctrl->ncommunities; i++) { 124 community = &pctrl->communities[i]; 125 if (pin >= community->pin_base && 126 pin < community->pin_base + community->npins) 127 return community; 128 } 129 130 dev_warn(pctrl->dev, "failed to find community for pin %u\n", pin); 131 return NULL; 132 } 133 134 static const struct intel_padgroup * 135 intel_community_get_padgroup(const struct intel_community *community, 136 unsigned pin) 137 { 138 int i; 139 140 for (i = 0; i < community->ngpps; i++) { 141 const struct intel_padgroup *padgrp = &community->gpps[i]; 142 143 if (pin >= padgrp->base && pin < padgrp->base + padgrp->size) 144 return padgrp; 145 } 146 147 return NULL; 148 } 149 150 static void __iomem *intel_get_padcfg(struct intel_pinctrl *pctrl, unsigned pin, 151 unsigned reg) 152 { 153 const struct intel_community *community; 154 unsigned padno; 155 size_t nregs; 156 157 community = intel_get_community(pctrl, pin); 158 if (!community) 159 return NULL; 160 161 padno = pin_to_padno(community, pin); 162 nregs = (community->features & PINCTRL_FEATURE_DEBOUNCE) ? 4 : 2; 163 164 if (reg == PADCFG2 && !(community->features & PINCTRL_FEATURE_DEBOUNCE)) 165 return NULL; 166 167 return community->pad_regs + reg + padno * nregs * 4; 168 } 169 170 static bool intel_pad_owned_by_host(struct intel_pinctrl *pctrl, unsigned pin) 171 { 172 const struct intel_community *community; 173 const struct intel_padgroup *padgrp; 174 unsigned gpp, offset, gpp_offset; 175 void __iomem *padown; 176 177 community = intel_get_community(pctrl, pin); 178 if (!community) 179 return false; 180 if (!community->padown_offset) 181 return true; 182 183 padgrp = intel_community_get_padgroup(community, pin); 184 if (!padgrp) 185 return false; 186 187 gpp_offset = padgroup_offset(padgrp, pin); 188 gpp = PADOWN_GPP(gpp_offset); 189 offset = community->padown_offset + padgrp->padown_num * 4 + gpp * 4; 190 padown = community->regs + offset; 191 192 return !(readl(padown) & PADOWN_MASK(gpp_offset)); 193 } 194 195 static bool intel_pad_acpi_mode(struct intel_pinctrl *pctrl, unsigned pin) 196 { 197 const struct intel_community *community; 198 const struct intel_padgroup *padgrp; 199 unsigned offset, gpp_offset; 200 void __iomem *hostown; 201 202 community = intel_get_community(pctrl, pin); 203 if (!community) 204 return true; 205 if (!community->hostown_offset) 206 return false; 207 208 padgrp = intel_community_get_padgroup(community, pin); 209 if (!padgrp) 210 return true; 211 212 gpp_offset = padgroup_offset(padgrp, pin); 213 offset = community->hostown_offset + padgrp->reg_num * 4; 214 hostown = community->regs + offset; 215 216 return !(readl(hostown) & BIT(gpp_offset)); 217 } 218 219 static bool intel_pad_locked(struct intel_pinctrl *pctrl, unsigned pin) 220 { 221 struct intel_community *community; 222 const struct intel_padgroup *padgrp; 223 unsigned offset, gpp_offset; 224 u32 value; 225 226 community = intel_get_community(pctrl, pin); 227 if (!community) 228 return true; 229 if (!community->padcfglock_offset) 230 return false; 231 232 padgrp = intel_community_get_padgroup(community, pin); 233 if (!padgrp) 234 return true; 235 236 gpp_offset = padgroup_offset(padgrp, pin); 237 238 /* 239 * If PADCFGLOCK and PADCFGLOCKTX bits are both clear for this pad, 240 * the pad is considered unlocked. Any other case means that it is 241 * either fully or partially locked and we don't touch it. 242 */ 243 offset = community->padcfglock_offset + padgrp->reg_num * 8; 244 value = readl(community->regs + offset); 245 if (value & BIT(gpp_offset)) 246 return true; 247 248 offset = community->padcfglock_offset + 4 + padgrp->reg_num * 8; 249 value = readl(community->regs + offset); 250 if (value & BIT(gpp_offset)) 251 return true; 252 253 return false; 254 } 255 256 static bool intel_pad_usable(struct intel_pinctrl *pctrl, unsigned pin) 257 { 258 return intel_pad_owned_by_host(pctrl, pin) && 259 !intel_pad_locked(pctrl, pin); 260 } 261 262 static int intel_get_groups_count(struct pinctrl_dev *pctldev) 263 { 264 struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); 265 266 return pctrl->soc->ngroups; 267 } 268 269 static const char *intel_get_group_name(struct pinctrl_dev *pctldev, 270 unsigned group) 271 { 272 struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); 273 274 return pctrl->soc->groups[group].name; 275 } 276 277 static int intel_get_group_pins(struct pinctrl_dev *pctldev, unsigned group, 278 const unsigned **pins, unsigned *npins) 279 { 280 struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); 281 282 *pins = pctrl->soc->groups[group].pins; 283 *npins = pctrl->soc->groups[group].npins; 284 return 0; 285 } 286 287 static void intel_pin_dbg_show(struct pinctrl_dev *pctldev, struct seq_file *s, 288 unsigned pin) 289 { 290 struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); 291 void __iomem *padcfg; 292 u32 cfg0, cfg1, mode; 293 bool locked, acpi; 294 295 if (!intel_pad_owned_by_host(pctrl, pin)) { 296 seq_puts(s, "not available"); 297 return; 298 } 299 300 cfg0 = readl(intel_get_padcfg(pctrl, pin, PADCFG0)); 301 cfg1 = readl(intel_get_padcfg(pctrl, pin, PADCFG1)); 302 303 mode = (cfg0 & PADCFG0_PMODE_MASK) >> PADCFG0_PMODE_SHIFT; 304 if (!mode) 305 seq_puts(s, "GPIO "); 306 else 307 seq_printf(s, "mode %d ", mode); 308 309 seq_printf(s, "0x%08x 0x%08x", cfg0, cfg1); 310 311 /* Dump the additional PADCFG registers if available */ 312 padcfg = intel_get_padcfg(pctrl, pin, PADCFG2); 313 if (padcfg) 314 seq_printf(s, " 0x%08x", readl(padcfg)); 315 316 locked = intel_pad_locked(pctrl, pin); 317 acpi = intel_pad_acpi_mode(pctrl, pin); 318 319 if (locked || acpi) { 320 seq_puts(s, " ["); 321 if (locked) { 322 seq_puts(s, "LOCKED"); 323 if (acpi) 324 seq_puts(s, ", "); 325 } 326 if (acpi) 327 seq_puts(s, "ACPI"); 328 seq_puts(s, "]"); 329 } 330 } 331 332 static const struct pinctrl_ops intel_pinctrl_ops = { 333 .get_groups_count = intel_get_groups_count, 334 .get_group_name = intel_get_group_name, 335 .get_group_pins = intel_get_group_pins, 336 .pin_dbg_show = intel_pin_dbg_show, 337 }; 338 339 static int intel_get_functions_count(struct pinctrl_dev *pctldev) 340 { 341 struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); 342 343 return pctrl->soc->nfunctions; 344 } 345 346 static const char *intel_get_function_name(struct pinctrl_dev *pctldev, 347 unsigned function) 348 { 349 struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); 350 351 return pctrl->soc->functions[function].name; 352 } 353 354 static int intel_get_function_groups(struct pinctrl_dev *pctldev, 355 unsigned function, 356 const char * const **groups, 357 unsigned * const ngroups) 358 { 359 struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); 360 361 *groups = pctrl->soc->functions[function].groups; 362 *ngroups = pctrl->soc->functions[function].ngroups; 363 return 0; 364 } 365 366 static int intel_pinmux_set_mux(struct pinctrl_dev *pctldev, unsigned function, 367 unsigned group) 368 { 369 struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); 370 const struct intel_pingroup *grp = &pctrl->soc->groups[group]; 371 unsigned long flags; 372 int i; 373 374 raw_spin_lock_irqsave(&pctrl->lock, flags); 375 376 /* 377 * All pins in the groups needs to be accessible and writable 378 * before we can enable the mux for this group. 379 */ 380 for (i = 0; i < grp->npins; i++) { 381 if (!intel_pad_usable(pctrl, grp->pins[i])) { 382 raw_spin_unlock_irqrestore(&pctrl->lock, flags); 383 return -EBUSY; 384 } 385 } 386 387 /* Now enable the mux setting for each pin in the group */ 388 for (i = 0; i < grp->npins; i++) { 389 void __iomem *padcfg0; 390 u32 value; 391 392 padcfg0 = intel_get_padcfg(pctrl, grp->pins[i], PADCFG0); 393 value = readl(padcfg0); 394 395 value &= ~PADCFG0_PMODE_MASK; 396 397 if (grp->modes) 398 value |= grp->modes[i] << PADCFG0_PMODE_SHIFT; 399 else 400 value |= grp->mode << PADCFG0_PMODE_SHIFT; 401 402 writel(value, padcfg0); 403 } 404 405 raw_spin_unlock_irqrestore(&pctrl->lock, flags); 406 407 return 0; 408 } 409 410 static void __intel_gpio_set_direction(void __iomem *padcfg0, bool input) 411 { 412 u32 value; 413 414 value = readl(padcfg0); 415 if (input) { 416 value &= ~PADCFG0_GPIORXDIS; 417 value |= PADCFG0_GPIOTXDIS; 418 } else { 419 value &= ~PADCFG0_GPIOTXDIS; 420 value |= PADCFG0_GPIORXDIS; 421 } 422 writel(value, padcfg0); 423 } 424 425 static void intel_gpio_set_gpio_mode(void __iomem *padcfg0) 426 { 427 u32 value; 428 429 /* Put the pad into GPIO mode */ 430 value = readl(padcfg0) & ~PADCFG0_PMODE_MASK; 431 /* Disable SCI/SMI/NMI generation */ 432 value &= ~(PADCFG0_GPIROUTIOXAPIC | PADCFG0_GPIROUTSCI); 433 value &= ~(PADCFG0_GPIROUTSMI | PADCFG0_GPIROUTNMI); 434 writel(value, padcfg0); 435 } 436 437 static int intel_gpio_request_enable(struct pinctrl_dev *pctldev, 438 struct pinctrl_gpio_range *range, 439 unsigned pin) 440 { 441 struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); 442 void __iomem *padcfg0; 443 unsigned long flags; 444 445 raw_spin_lock_irqsave(&pctrl->lock, flags); 446 447 if (!intel_pad_usable(pctrl, pin)) { 448 raw_spin_unlock_irqrestore(&pctrl->lock, flags); 449 return -EBUSY; 450 } 451 452 padcfg0 = intel_get_padcfg(pctrl, pin, PADCFG0); 453 intel_gpio_set_gpio_mode(padcfg0); 454 /* Disable TX buffer and enable RX (this will be input) */ 455 __intel_gpio_set_direction(padcfg0, true); 456 457 raw_spin_unlock_irqrestore(&pctrl->lock, flags); 458 459 return 0; 460 } 461 462 static int intel_gpio_set_direction(struct pinctrl_dev *pctldev, 463 struct pinctrl_gpio_range *range, 464 unsigned pin, bool input) 465 { 466 struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); 467 void __iomem *padcfg0; 468 unsigned long flags; 469 470 raw_spin_lock_irqsave(&pctrl->lock, flags); 471 472 padcfg0 = intel_get_padcfg(pctrl, pin, PADCFG0); 473 __intel_gpio_set_direction(padcfg0, input); 474 475 raw_spin_unlock_irqrestore(&pctrl->lock, flags); 476 477 return 0; 478 } 479 480 static const struct pinmux_ops intel_pinmux_ops = { 481 .get_functions_count = intel_get_functions_count, 482 .get_function_name = intel_get_function_name, 483 .get_function_groups = intel_get_function_groups, 484 .set_mux = intel_pinmux_set_mux, 485 .gpio_request_enable = intel_gpio_request_enable, 486 .gpio_set_direction = intel_gpio_set_direction, 487 }; 488 489 static int intel_config_get(struct pinctrl_dev *pctldev, unsigned pin, 490 unsigned long *config) 491 { 492 struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); 493 enum pin_config_param param = pinconf_to_config_param(*config); 494 const struct intel_community *community; 495 u32 value, term; 496 u32 arg = 0; 497 498 if (!intel_pad_owned_by_host(pctrl, pin)) 499 return -ENOTSUPP; 500 501 community = intel_get_community(pctrl, pin); 502 value = readl(intel_get_padcfg(pctrl, pin, PADCFG1)); 503 term = (value & PADCFG1_TERM_MASK) >> PADCFG1_TERM_SHIFT; 504 505 switch (param) { 506 case PIN_CONFIG_BIAS_DISABLE: 507 if (term) 508 return -EINVAL; 509 break; 510 511 case PIN_CONFIG_BIAS_PULL_UP: 512 if (!term || !(value & PADCFG1_TERM_UP)) 513 return -EINVAL; 514 515 switch (term) { 516 case PADCFG1_TERM_1K: 517 arg = 1000; 518 break; 519 case PADCFG1_TERM_2K: 520 arg = 2000; 521 break; 522 case PADCFG1_TERM_5K: 523 arg = 5000; 524 break; 525 case PADCFG1_TERM_20K: 526 arg = 20000; 527 break; 528 } 529 530 break; 531 532 case PIN_CONFIG_BIAS_PULL_DOWN: 533 if (!term || value & PADCFG1_TERM_UP) 534 return -EINVAL; 535 536 switch (term) { 537 case PADCFG1_TERM_1K: 538 if (!(community->features & PINCTRL_FEATURE_1K_PD)) 539 return -EINVAL; 540 arg = 1000; 541 break; 542 case PADCFG1_TERM_5K: 543 arg = 5000; 544 break; 545 case PADCFG1_TERM_20K: 546 arg = 20000; 547 break; 548 } 549 550 break; 551 552 case PIN_CONFIG_INPUT_DEBOUNCE: { 553 void __iomem *padcfg2; 554 u32 v; 555 556 padcfg2 = intel_get_padcfg(pctrl, pin, PADCFG2); 557 if (!padcfg2) 558 return -ENOTSUPP; 559 560 v = readl(padcfg2); 561 if (!(v & PADCFG2_DEBEN)) 562 return -EINVAL; 563 564 v = (v & PADCFG2_DEBOUNCE_MASK) >> PADCFG2_DEBOUNCE_SHIFT; 565 arg = BIT(v) * DEBOUNCE_PERIOD / 1000; 566 567 break; 568 } 569 570 default: 571 return -ENOTSUPP; 572 } 573 574 *config = pinconf_to_config_packed(param, arg); 575 return 0; 576 } 577 578 static int intel_config_set_pull(struct intel_pinctrl *pctrl, unsigned pin, 579 unsigned long config) 580 { 581 unsigned param = pinconf_to_config_param(config); 582 unsigned arg = pinconf_to_config_argument(config); 583 const struct intel_community *community; 584 void __iomem *padcfg1; 585 unsigned long flags; 586 int ret = 0; 587 u32 value; 588 589 raw_spin_lock_irqsave(&pctrl->lock, flags); 590 591 community = intel_get_community(pctrl, pin); 592 padcfg1 = intel_get_padcfg(pctrl, pin, PADCFG1); 593 value = readl(padcfg1); 594 595 switch (param) { 596 case PIN_CONFIG_BIAS_DISABLE: 597 value &= ~(PADCFG1_TERM_MASK | PADCFG1_TERM_UP); 598 break; 599 600 case PIN_CONFIG_BIAS_PULL_UP: 601 value &= ~PADCFG1_TERM_MASK; 602 603 value |= PADCFG1_TERM_UP; 604 605 switch (arg) { 606 case 20000: 607 value |= PADCFG1_TERM_20K << PADCFG1_TERM_SHIFT; 608 break; 609 case 5000: 610 value |= PADCFG1_TERM_5K << PADCFG1_TERM_SHIFT; 611 break; 612 case 2000: 613 value |= PADCFG1_TERM_2K << PADCFG1_TERM_SHIFT; 614 break; 615 case 1000: 616 value |= PADCFG1_TERM_1K << PADCFG1_TERM_SHIFT; 617 break; 618 default: 619 ret = -EINVAL; 620 } 621 622 break; 623 624 case PIN_CONFIG_BIAS_PULL_DOWN: 625 value &= ~(PADCFG1_TERM_UP | PADCFG1_TERM_MASK); 626 627 switch (arg) { 628 case 20000: 629 value |= PADCFG1_TERM_20K << PADCFG1_TERM_SHIFT; 630 break; 631 case 5000: 632 value |= PADCFG1_TERM_5K << PADCFG1_TERM_SHIFT; 633 break; 634 case 1000: 635 if (!(community->features & PINCTRL_FEATURE_1K_PD)) { 636 ret = -EINVAL; 637 break; 638 } 639 value |= PADCFG1_TERM_1K << PADCFG1_TERM_SHIFT; 640 break; 641 default: 642 ret = -EINVAL; 643 } 644 645 break; 646 } 647 648 if (!ret) 649 writel(value, padcfg1); 650 651 raw_spin_unlock_irqrestore(&pctrl->lock, flags); 652 653 return ret; 654 } 655 656 static int intel_config_set_debounce(struct intel_pinctrl *pctrl, unsigned pin, 657 unsigned debounce) 658 { 659 void __iomem *padcfg0, *padcfg2; 660 unsigned long flags; 661 u32 value0, value2; 662 int ret = 0; 663 664 padcfg2 = intel_get_padcfg(pctrl, pin, PADCFG2); 665 if (!padcfg2) 666 return -ENOTSUPP; 667 668 padcfg0 = intel_get_padcfg(pctrl, pin, PADCFG0); 669 670 raw_spin_lock_irqsave(&pctrl->lock, flags); 671 672 value0 = readl(padcfg0); 673 value2 = readl(padcfg2); 674 675 /* Disable glitch filter and debouncer */ 676 value0 &= ~PADCFG0_PREGFRXSEL; 677 value2 &= ~(PADCFG2_DEBEN | PADCFG2_DEBOUNCE_MASK); 678 679 if (debounce) { 680 unsigned long v; 681 682 v = order_base_2(debounce * 1000 / DEBOUNCE_PERIOD); 683 if (v < 3 || v > 15) { 684 ret = -EINVAL; 685 goto exit_unlock; 686 } else { 687 /* Enable glitch filter and debouncer */ 688 value0 |= PADCFG0_PREGFRXSEL; 689 value2 |= v << PADCFG2_DEBOUNCE_SHIFT; 690 value2 |= PADCFG2_DEBEN; 691 } 692 } 693 694 writel(value0, padcfg0); 695 writel(value2, padcfg2); 696 697 exit_unlock: 698 raw_spin_unlock_irqrestore(&pctrl->lock, flags); 699 700 return ret; 701 } 702 703 static int intel_config_set(struct pinctrl_dev *pctldev, unsigned pin, 704 unsigned long *configs, unsigned nconfigs) 705 { 706 struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); 707 int i, ret; 708 709 if (!intel_pad_usable(pctrl, pin)) 710 return -ENOTSUPP; 711 712 for (i = 0; i < nconfigs; i++) { 713 switch (pinconf_to_config_param(configs[i])) { 714 case PIN_CONFIG_BIAS_DISABLE: 715 case PIN_CONFIG_BIAS_PULL_UP: 716 case PIN_CONFIG_BIAS_PULL_DOWN: 717 ret = intel_config_set_pull(pctrl, pin, configs[i]); 718 if (ret) 719 return ret; 720 break; 721 722 case PIN_CONFIG_INPUT_DEBOUNCE: 723 ret = intel_config_set_debounce(pctrl, pin, 724 pinconf_to_config_argument(configs[i])); 725 if (ret) 726 return ret; 727 break; 728 729 default: 730 return -ENOTSUPP; 731 } 732 } 733 734 return 0; 735 } 736 737 static const struct pinconf_ops intel_pinconf_ops = { 738 .is_generic = true, 739 .pin_config_get = intel_config_get, 740 .pin_config_set = intel_config_set, 741 }; 742 743 static const struct pinctrl_desc intel_pinctrl_desc = { 744 .pctlops = &intel_pinctrl_ops, 745 .pmxops = &intel_pinmux_ops, 746 .confops = &intel_pinconf_ops, 747 .owner = THIS_MODULE, 748 }; 749 750 /** 751 * intel_gpio_to_pin() - Translate from GPIO offset to pin number 752 * @pctrl: Pinctrl structure 753 * @offset: GPIO offset from gpiolib 754 * @commmunity: Community is filled here if not %NULL 755 * @padgrp: Pad group is filled here if not %NULL 756 * 757 * When coming through gpiolib irqchip, the GPIO offset is not 758 * automatically translated to pinctrl pin number. This function can be 759 * used to find out the corresponding pinctrl pin. 760 */ 761 static int intel_gpio_to_pin(struct intel_pinctrl *pctrl, unsigned offset, 762 const struct intel_community **community, 763 const struct intel_padgroup **padgrp) 764 { 765 int i; 766 767 for (i = 0; i < pctrl->ncommunities; i++) { 768 const struct intel_community *comm = &pctrl->communities[i]; 769 int j; 770 771 for (j = 0; j < comm->ngpps; j++) { 772 const struct intel_padgroup *pgrp = &comm->gpps[j]; 773 774 if (pgrp->gpio_base < 0) 775 continue; 776 777 if (offset >= pgrp->gpio_base && 778 offset < pgrp->gpio_base + pgrp->size) { 779 int pin; 780 781 pin = pgrp->base + offset - pgrp->gpio_base; 782 if (community) 783 *community = comm; 784 if (padgrp) 785 *padgrp = pgrp; 786 787 return pin; 788 } 789 } 790 } 791 792 return -EINVAL; 793 } 794 795 static int intel_gpio_get(struct gpio_chip *chip, unsigned offset) 796 { 797 struct intel_pinctrl *pctrl = gpiochip_get_data(chip); 798 void __iomem *reg; 799 u32 padcfg0; 800 int pin; 801 802 pin = intel_gpio_to_pin(pctrl, offset, NULL, NULL); 803 if (pin < 0) 804 return -EINVAL; 805 806 reg = intel_get_padcfg(pctrl, pin, PADCFG0); 807 if (!reg) 808 return -EINVAL; 809 810 padcfg0 = readl(reg); 811 if (!(padcfg0 & PADCFG0_GPIOTXDIS)) 812 return !!(padcfg0 & PADCFG0_GPIOTXSTATE); 813 814 return !!(padcfg0 & PADCFG0_GPIORXSTATE); 815 } 816 817 static void intel_gpio_set(struct gpio_chip *chip, unsigned offset, int value) 818 { 819 struct intel_pinctrl *pctrl = gpiochip_get_data(chip); 820 unsigned long flags; 821 void __iomem *reg; 822 u32 padcfg0; 823 int pin; 824 825 pin = intel_gpio_to_pin(pctrl, offset, NULL, NULL); 826 if (pin < 0) 827 return; 828 829 reg = intel_get_padcfg(pctrl, pin, PADCFG0); 830 if (!reg) 831 return; 832 833 raw_spin_lock_irqsave(&pctrl->lock, flags); 834 padcfg0 = readl(reg); 835 if (value) 836 padcfg0 |= PADCFG0_GPIOTXSTATE; 837 else 838 padcfg0 &= ~PADCFG0_GPIOTXSTATE; 839 writel(padcfg0, reg); 840 raw_spin_unlock_irqrestore(&pctrl->lock, flags); 841 } 842 843 static int intel_gpio_get_direction(struct gpio_chip *chip, unsigned int offset) 844 { 845 struct intel_pinctrl *pctrl = gpiochip_get_data(chip); 846 void __iomem *reg; 847 u32 padcfg0; 848 int pin; 849 850 pin = intel_gpio_to_pin(pctrl, offset, NULL, NULL); 851 if (pin < 0) 852 return -EINVAL; 853 854 reg = intel_get_padcfg(pctrl, pin, PADCFG0); 855 if (!reg) 856 return -EINVAL; 857 858 padcfg0 = readl(reg); 859 860 if (padcfg0 & PADCFG0_PMODE_MASK) 861 return -EINVAL; 862 863 return !!(padcfg0 & PADCFG0_GPIOTXDIS); 864 } 865 866 static int intel_gpio_direction_input(struct gpio_chip *chip, unsigned offset) 867 { 868 return pinctrl_gpio_direction_input(chip->base + offset); 869 } 870 871 static int intel_gpio_direction_output(struct gpio_chip *chip, unsigned offset, 872 int value) 873 { 874 intel_gpio_set(chip, offset, value); 875 return pinctrl_gpio_direction_output(chip->base + offset); 876 } 877 878 static const struct gpio_chip intel_gpio_chip = { 879 .owner = THIS_MODULE, 880 .request = gpiochip_generic_request, 881 .free = gpiochip_generic_free, 882 .get_direction = intel_gpio_get_direction, 883 .direction_input = intel_gpio_direction_input, 884 .direction_output = intel_gpio_direction_output, 885 .get = intel_gpio_get, 886 .set = intel_gpio_set, 887 .set_config = gpiochip_generic_config, 888 }; 889 890 static void intel_gpio_irq_ack(struct irq_data *d) 891 { 892 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 893 struct intel_pinctrl *pctrl = gpiochip_get_data(gc); 894 const struct intel_community *community; 895 const struct intel_padgroup *padgrp; 896 int pin; 897 898 pin = intel_gpio_to_pin(pctrl, irqd_to_hwirq(d), &community, &padgrp); 899 if (pin >= 0) { 900 unsigned gpp, gpp_offset, is_offset; 901 902 gpp = padgrp->reg_num; 903 gpp_offset = padgroup_offset(padgrp, pin); 904 is_offset = community->is_offset + gpp * 4; 905 906 raw_spin_lock(&pctrl->lock); 907 writel(BIT(gpp_offset), community->regs + is_offset); 908 raw_spin_unlock(&pctrl->lock); 909 } 910 } 911 912 static void intel_gpio_irq_enable(struct irq_data *d) 913 { 914 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 915 struct intel_pinctrl *pctrl = gpiochip_get_data(gc); 916 const struct intel_community *community; 917 const struct intel_padgroup *padgrp; 918 int pin; 919 920 pin = intel_gpio_to_pin(pctrl, irqd_to_hwirq(d), &community, &padgrp); 921 if (pin >= 0) { 922 unsigned gpp, gpp_offset, is_offset; 923 unsigned long flags; 924 u32 value; 925 926 gpp = padgrp->reg_num; 927 gpp_offset = padgroup_offset(padgrp, pin); 928 is_offset = community->is_offset + gpp * 4; 929 930 raw_spin_lock_irqsave(&pctrl->lock, flags); 931 /* Clear interrupt status first to avoid unexpected interrupt */ 932 writel(BIT(gpp_offset), community->regs + is_offset); 933 934 value = readl(community->regs + community->ie_offset + gpp * 4); 935 value |= BIT(gpp_offset); 936 writel(value, community->regs + community->ie_offset + gpp * 4); 937 raw_spin_unlock_irqrestore(&pctrl->lock, flags); 938 } 939 } 940 941 static void intel_gpio_irq_mask_unmask(struct irq_data *d, bool mask) 942 { 943 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 944 struct intel_pinctrl *pctrl = gpiochip_get_data(gc); 945 const struct intel_community *community; 946 const struct intel_padgroup *padgrp; 947 int pin; 948 949 pin = intel_gpio_to_pin(pctrl, irqd_to_hwirq(d), &community, &padgrp); 950 if (pin >= 0) { 951 unsigned gpp, gpp_offset; 952 unsigned long flags; 953 void __iomem *reg; 954 u32 value; 955 956 gpp = padgrp->reg_num; 957 gpp_offset = padgroup_offset(padgrp, pin); 958 959 reg = community->regs + community->ie_offset + gpp * 4; 960 961 raw_spin_lock_irqsave(&pctrl->lock, flags); 962 value = readl(reg); 963 if (mask) 964 value &= ~BIT(gpp_offset); 965 else 966 value |= BIT(gpp_offset); 967 writel(value, reg); 968 raw_spin_unlock_irqrestore(&pctrl->lock, flags); 969 } 970 } 971 972 static void intel_gpio_irq_mask(struct irq_data *d) 973 { 974 intel_gpio_irq_mask_unmask(d, true); 975 } 976 977 static void intel_gpio_irq_unmask(struct irq_data *d) 978 { 979 intel_gpio_irq_mask_unmask(d, false); 980 } 981 982 static int intel_gpio_irq_type(struct irq_data *d, unsigned type) 983 { 984 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 985 struct intel_pinctrl *pctrl = gpiochip_get_data(gc); 986 unsigned pin = intel_gpio_to_pin(pctrl, irqd_to_hwirq(d), NULL, NULL); 987 unsigned long flags; 988 void __iomem *reg; 989 u32 value; 990 991 reg = intel_get_padcfg(pctrl, pin, PADCFG0); 992 if (!reg) 993 return -EINVAL; 994 995 /* 996 * If the pin is in ACPI mode it is still usable as a GPIO but it 997 * cannot be used as IRQ because GPI_IS status bit will not be 998 * updated by the host controller hardware. 999 */ 1000 if (intel_pad_acpi_mode(pctrl, pin)) { 1001 dev_warn(pctrl->dev, "pin %u cannot be used as IRQ\n", pin); 1002 return -EPERM; 1003 } 1004 1005 raw_spin_lock_irqsave(&pctrl->lock, flags); 1006 1007 intel_gpio_set_gpio_mode(reg); 1008 1009 value = readl(reg); 1010 1011 value &= ~(PADCFG0_RXEVCFG_MASK | PADCFG0_RXINV); 1012 1013 if ((type & IRQ_TYPE_EDGE_BOTH) == IRQ_TYPE_EDGE_BOTH) { 1014 value |= PADCFG0_RXEVCFG_EDGE_BOTH << PADCFG0_RXEVCFG_SHIFT; 1015 } else if (type & IRQ_TYPE_EDGE_FALLING) { 1016 value |= PADCFG0_RXEVCFG_EDGE << PADCFG0_RXEVCFG_SHIFT; 1017 value |= PADCFG0_RXINV; 1018 } else if (type & IRQ_TYPE_EDGE_RISING) { 1019 value |= PADCFG0_RXEVCFG_EDGE << PADCFG0_RXEVCFG_SHIFT; 1020 } else if (type & IRQ_TYPE_LEVEL_MASK) { 1021 if (type & IRQ_TYPE_LEVEL_LOW) 1022 value |= PADCFG0_RXINV; 1023 } else { 1024 value |= PADCFG0_RXEVCFG_DISABLED << PADCFG0_RXEVCFG_SHIFT; 1025 } 1026 1027 writel(value, reg); 1028 1029 if (type & IRQ_TYPE_EDGE_BOTH) 1030 irq_set_handler_locked(d, handle_edge_irq); 1031 else if (type & IRQ_TYPE_LEVEL_MASK) 1032 irq_set_handler_locked(d, handle_level_irq); 1033 1034 raw_spin_unlock_irqrestore(&pctrl->lock, flags); 1035 1036 return 0; 1037 } 1038 1039 static int intel_gpio_irq_wake(struct irq_data *d, unsigned int on) 1040 { 1041 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 1042 struct intel_pinctrl *pctrl = gpiochip_get_data(gc); 1043 unsigned pin = intel_gpio_to_pin(pctrl, irqd_to_hwirq(d), NULL, NULL); 1044 1045 if (on) 1046 enable_irq_wake(pctrl->irq); 1047 else 1048 disable_irq_wake(pctrl->irq); 1049 1050 dev_dbg(pctrl->dev, "%sable wake for pin %u\n", on ? "en" : "dis", pin); 1051 return 0; 1052 } 1053 1054 static irqreturn_t intel_gpio_community_irq_handler(struct intel_pinctrl *pctrl, 1055 const struct intel_community *community) 1056 { 1057 struct gpio_chip *gc = &pctrl->chip; 1058 irqreturn_t ret = IRQ_NONE; 1059 int gpp; 1060 1061 for (gpp = 0; gpp < community->ngpps; gpp++) { 1062 const struct intel_padgroup *padgrp = &community->gpps[gpp]; 1063 unsigned long pending, enabled, gpp_offset; 1064 1065 pending = readl(community->regs + community->is_offset + 1066 padgrp->reg_num * 4); 1067 enabled = readl(community->regs + community->ie_offset + 1068 padgrp->reg_num * 4); 1069 1070 /* Only interrupts that are enabled */ 1071 pending &= enabled; 1072 1073 for_each_set_bit(gpp_offset, &pending, padgrp->size) { 1074 unsigned irq; 1075 1076 irq = irq_find_mapping(gc->irq.domain, 1077 padgrp->gpio_base + gpp_offset); 1078 generic_handle_irq(irq); 1079 1080 ret |= IRQ_HANDLED; 1081 } 1082 } 1083 1084 return ret; 1085 } 1086 1087 static irqreturn_t intel_gpio_irq(int irq, void *data) 1088 { 1089 const struct intel_community *community; 1090 struct intel_pinctrl *pctrl = data; 1091 irqreturn_t ret = IRQ_NONE; 1092 int i; 1093 1094 /* Need to check all communities for pending interrupts */ 1095 for (i = 0; i < pctrl->ncommunities; i++) { 1096 community = &pctrl->communities[i]; 1097 ret |= intel_gpio_community_irq_handler(pctrl, community); 1098 } 1099 1100 return ret; 1101 } 1102 1103 static struct irq_chip intel_gpio_irqchip = { 1104 .name = "intel-gpio", 1105 .irq_enable = intel_gpio_irq_enable, 1106 .irq_ack = intel_gpio_irq_ack, 1107 .irq_mask = intel_gpio_irq_mask, 1108 .irq_unmask = intel_gpio_irq_unmask, 1109 .irq_set_type = intel_gpio_irq_type, 1110 .irq_set_wake = intel_gpio_irq_wake, 1111 .flags = IRQCHIP_MASK_ON_SUSPEND, 1112 }; 1113 1114 static int intel_gpio_add_pin_ranges(struct intel_pinctrl *pctrl, 1115 const struct intel_community *community) 1116 { 1117 int ret = 0, i; 1118 1119 for (i = 0; i < community->ngpps; i++) { 1120 const struct intel_padgroup *gpp = &community->gpps[i]; 1121 1122 if (gpp->gpio_base < 0) 1123 continue; 1124 1125 ret = gpiochip_add_pin_range(&pctrl->chip, dev_name(pctrl->dev), 1126 gpp->gpio_base, gpp->base, 1127 gpp->size); 1128 if (ret) 1129 return ret; 1130 } 1131 1132 return ret; 1133 } 1134 1135 static unsigned intel_gpio_ngpio(const struct intel_pinctrl *pctrl) 1136 { 1137 const struct intel_community *community; 1138 unsigned ngpio = 0; 1139 int i, j; 1140 1141 for (i = 0; i < pctrl->ncommunities; i++) { 1142 community = &pctrl->communities[i]; 1143 for (j = 0; j < community->ngpps; j++) { 1144 const struct intel_padgroup *gpp = &community->gpps[j]; 1145 1146 if (gpp->gpio_base < 0) 1147 continue; 1148 1149 if (gpp->gpio_base + gpp->size > ngpio) 1150 ngpio = gpp->gpio_base + gpp->size; 1151 } 1152 } 1153 1154 return ngpio; 1155 } 1156 1157 static int intel_gpio_probe(struct intel_pinctrl *pctrl, int irq) 1158 { 1159 int ret, i; 1160 1161 pctrl->chip = intel_gpio_chip; 1162 1163 pctrl->chip.ngpio = intel_gpio_ngpio(pctrl); 1164 pctrl->chip.label = dev_name(pctrl->dev); 1165 pctrl->chip.parent = pctrl->dev; 1166 pctrl->chip.base = -1; 1167 pctrl->irq = irq; 1168 1169 ret = devm_gpiochip_add_data(pctrl->dev, &pctrl->chip, pctrl); 1170 if (ret) { 1171 dev_err(pctrl->dev, "failed to register gpiochip\n"); 1172 return ret; 1173 } 1174 1175 for (i = 0; i < pctrl->ncommunities; i++) { 1176 struct intel_community *community = &pctrl->communities[i]; 1177 1178 ret = intel_gpio_add_pin_ranges(pctrl, community); 1179 if (ret) { 1180 dev_err(pctrl->dev, "failed to add GPIO pin range\n"); 1181 return ret; 1182 } 1183 } 1184 1185 /* 1186 * We need to request the interrupt here (instead of providing chip 1187 * to the irq directly) because on some platforms several GPIO 1188 * controllers share the same interrupt line. 1189 */ 1190 ret = devm_request_irq(pctrl->dev, irq, intel_gpio_irq, 1191 IRQF_SHARED | IRQF_NO_THREAD, 1192 dev_name(pctrl->dev), pctrl); 1193 if (ret) { 1194 dev_err(pctrl->dev, "failed to request interrupt\n"); 1195 return ret; 1196 } 1197 1198 ret = gpiochip_irqchip_add(&pctrl->chip, &intel_gpio_irqchip, 0, 1199 handle_bad_irq, IRQ_TYPE_NONE); 1200 if (ret) { 1201 dev_err(pctrl->dev, "failed to add irqchip\n"); 1202 return ret; 1203 } 1204 1205 gpiochip_set_chained_irqchip(&pctrl->chip, &intel_gpio_irqchip, irq, 1206 NULL); 1207 return 0; 1208 } 1209 1210 static int intel_pinctrl_add_padgroups(struct intel_pinctrl *pctrl, 1211 struct intel_community *community) 1212 { 1213 struct intel_padgroup *gpps; 1214 unsigned npins = community->npins; 1215 unsigned padown_num = 0; 1216 size_t ngpps, i; 1217 1218 if (community->gpps) 1219 ngpps = community->ngpps; 1220 else 1221 ngpps = DIV_ROUND_UP(community->npins, community->gpp_size); 1222 1223 gpps = devm_kcalloc(pctrl->dev, ngpps, sizeof(*gpps), GFP_KERNEL); 1224 if (!gpps) 1225 return -ENOMEM; 1226 1227 for (i = 0; i < ngpps; i++) { 1228 if (community->gpps) { 1229 gpps[i] = community->gpps[i]; 1230 } else { 1231 unsigned gpp_size = community->gpp_size; 1232 1233 gpps[i].reg_num = i; 1234 gpps[i].base = community->pin_base + i * gpp_size; 1235 gpps[i].size = min(gpp_size, npins); 1236 npins -= gpps[i].size; 1237 } 1238 1239 if (gpps[i].size > 32) 1240 return -EINVAL; 1241 1242 if (!gpps[i].gpio_base) 1243 gpps[i].gpio_base = gpps[i].base; 1244 1245 gpps[i].padown_num = padown_num; 1246 1247 /* 1248 * In older hardware the number of padown registers per 1249 * group is fixed regardless of the group size. 1250 */ 1251 if (community->gpp_num_padown_regs) 1252 padown_num += community->gpp_num_padown_regs; 1253 else 1254 padown_num += DIV_ROUND_UP(gpps[i].size * 4, 32); 1255 } 1256 1257 community->ngpps = ngpps; 1258 community->gpps = gpps; 1259 1260 return 0; 1261 } 1262 1263 static int intel_pinctrl_pm_init(struct intel_pinctrl *pctrl) 1264 { 1265 #ifdef CONFIG_PM_SLEEP 1266 const struct intel_pinctrl_soc_data *soc = pctrl->soc; 1267 struct intel_community_context *communities; 1268 struct intel_pad_context *pads; 1269 int i; 1270 1271 pads = devm_kcalloc(pctrl->dev, soc->npins, sizeof(*pads), GFP_KERNEL); 1272 if (!pads) 1273 return -ENOMEM; 1274 1275 communities = devm_kcalloc(pctrl->dev, pctrl->ncommunities, 1276 sizeof(*communities), GFP_KERNEL); 1277 if (!communities) 1278 return -ENOMEM; 1279 1280 1281 for (i = 0; i < pctrl->ncommunities; i++) { 1282 struct intel_community *community = &pctrl->communities[i]; 1283 u32 *intmask; 1284 1285 intmask = devm_kcalloc(pctrl->dev, community->ngpps, 1286 sizeof(*intmask), GFP_KERNEL); 1287 if (!intmask) 1288 return -ENOMEM; 1289 1290 communities[i].intmask = intmask; 1291 } 1292 1293 pctrl->context.pads = pads; 1294 pctrl->context.communities = communities; 1295 #endif 1296 1297 return 0; 1298 } 1299 1300 int intel_pinctrl_probe(struct platform_device *pdev, 1301 const struct intel_pinctrl_soc_data *soc_data) 1302 { 1303 struct intel_pinctrl *pctrl; 1304 int i, ret, irq; 1305 1306 if (!soc_data) 1307 return -EINVAL; 1308 1309 pctrl = devm_kzalloc(&pdev->dev, sizeof(*pctrl), GFP_KERNEL); 1310 if (!pctrl) 1311 return -ENOMEM; 1312 1313 pctrl->dev = &pdev->dev; 1314 pctrl->soc = soc_data; 1315 raw_spin_lock_init(&pctrl->lock); 1316 1317 /* 1318 * Make a copy of the communities which we can use to hold pointers 1319 * to the registers. 1320 */ 1321 pctrl->ncommunities = pctrl->soc->ncommunities; 1322 pctrl->communities = devm_kcalloc(&pdev->dev, pctrl->ncommunities, 1323 sizeof(*pctrl->communities), GFP_KERNEL); 1324 if (!pctrl->communities) 1325 return -ENOMEM; 1326 1327 for (i = 0; i < pctrl->ncommunities; i++) { 1328 struct intel_community *community = &pctrl->communities[i]; 1329 struct resource *res; 1330 void __iomem *regs; 1331 u32 padbar; 1332 1333 *community = pctrl->soc->communities[i]; 1334 1335 res = platform_get_resource(pdev, IORESOURCE_MEM, 1336 community->barno); 1337 regs = devm_ioremap_resource(&pdev->dev, res); 1338 if (IS_ERR(regs)) 1339 return PTR_ERR(regs); 1340 1341 /* 1342 * Determine community features based on the revision if 1343 * not specified already. 1344 */ 1345 if (!community->features) { 1346 u32 rev; 1347 1348 rev = (readl(regs + REVID) & REVID_MASK) >> REVID_SHIFT; 1349 if (rev >= 0x94) { 1350 community->features |= PINCTRL_FEATURE_DEBOUNCE; 1351 community->features |= PINCTRL_FEATURE_1K_PD; 1352 } 1353 } 1354 1355 /* Read offset of the pad configuration registers */ 1356 padbar = readl(regs + PADBAR); 1357 1358 community->regs = regs; 1359 community->pad_regs = regs + padbar; 1360 1361 if (!community->is_offset) 1362 community->is_offset = GPI_IS; 1363 1364 ret = intel_pinctrl_add_padgroups(pctrl, community); 1365 if (ret) 1366 return ret; 1367 } 1368 1369 irq = platform_get_irq(pdev, 0); 1370 if (irq < 0) { 1371 dev_err(&pdev->dev, "failed to get interrupt number\n"); 1372 return irq; 1373 } 1374 1375 ret = intel_pinctrl_pm_init(pctrl); 1376 if (ret) 1377 return ret; 1378 1379 pctrl->pctldesc = intel_pinctrl_desc; 1380 pctrl->pctldesc.name = dev_name(&pdev->dev); 1381 pctrl->pctldesc.pins = pctrl->soc->pins; 1382 pctrl->pctldesc.npins = pctrl->soc->npins; 1383 1384 pctrl->pctldev = devm_pinctrl_register(&pdev->dev, &pctrl->pctldesc, 1385 pctrl); 1386 if (IS_ERR(pctrl->pctldev)) { 1387 dev_err(&pdev->dev, "failed to register pinctrl driver\n"); 1388 return PTR_ERR(pctrl->pctldev); 1389 } 1390 1391 ret = intel_gpio_probe(pctrl, irq); 1392 if (ret) 1393 return ret; 1394 1395 platform_set_drvdata(pdev, pctrl); 1396 1397 return 0; 1398 } 1399 EXPORT_SYMBOL_GPL(intel_pinctrl_probe); 1400 1401 #ifdef CONFIG_PM_SLEEP 1402 static bool intel_pinctrl_should_save(struct intel_pinctrl *pctrl, unsigned pin) 1403 { 1404 const struct pin_desc *pd = pin_desc_get(pctrl->pctldev, pin); 1405 1406 if (!pd || !intel_pad_usable(pctrl, pin)) 1407 return false; 1408 1409 /* 1410 * Only restore the pin if it is actually in use by the kernel (or 1411 * by userspace). It is possible that some pins are used by the 1412 * BIOS during resume and those are not always locked down so leave 1413 * them alone. 1414 */ 1415 if (pd->mux_owner || pd->gpio_owner || 1416 gpiochip_line_is_irq(&pctrl->chip, pin)) 1417 return true; 1418 1419 return false; 1420 } 1421 1422 int intel_pinctrl_suspend(struct device *dev) 1423 { 1424 struct platform_device *pdev = to_platform_device(dev); 1425 struct intel_pinctrl *pctrl = platform_get_drvdata(pdev); 1426 struct intel_community_context *communities; 1427 struct intel_pad_context *pads; 1428 int i; 1429 1430 pads = pctrl->context.pads; 1431 for (i = 0; i < pctrl->soc->npins; i++) { 1432 const struct pinctrl_pin_desc *desc = &pctrl->soc->pins[i]; 1433 void __iomem *padcfg; 1434 u32 val; 1435 1436 if (!intel_pinctrl_should_save(pctrl, desc->number)) 1437 continue; 1438 1439 val = readl(intel_get_padcfg(pctrl, desc->number, PADCFG0)); 1440 pads[i].padcfg0 = val & ~PADCFG0_GPIORXSTATE; 1441 val = readl(intel_get_padcfg(pctrl, desc->number, PADCFG1)); 1442 pads[i].padcfg1 = val; 1443 1444 padcfg = intel_get_padcfg(pctrl, desc->number, PADCFG2); 1445 if (padcfg) 1446 pads[i].padcfg2 = readl(padcfg); 1447 } 1448 1449 communities = pctrl->context.communities; 1450 for (i = 0; i < pctrl->ncommunities; i++) { 1451 struct intel_community *community = &pctrl->communities[i]; 1452 void __iomem *base; 1453 unsigned gpp; 1454 1455 base = community->regs + community->ie_offset; 1456 for (gpp = 0; gpp < community->ngpps; gpp++) 1457 communities[i].intmask[gpp] = readl(base + gpp * 4); 1458 } 1459 1460 return 0; 1461 } 1462 EXPORT_SYMBOL_GPL(intel_pinctrl_suspend); 1463 1464 static void intel_gpio_irq_init(struct intel_pinctrl *pctrl) 1465 { 1466 size_t i; 1467 1468 for (i = 0; i < pctrl->ncommunities; i++) { 1469 const struct intel_community *community; 1470 void __iomem *base; 1471 unsigned gpp; 1472 1473 community = &pctrl->communities[i]; 1474 base = community->regs; 1475 1476 for (gpp = 0; gpp < community->ngpps; gpp++) { 1477 /* Mask and clear all interrupts */ 1478 writel(0, base + community->ie_offset + gpp * 4); 1479 writel(0xffff, base + community->is_offset + gpp * 4); 1480 } 1481 } 1482 } 1483 1484 int intel_pinctrl_resume(struct device *dev) 1485 { 1486 struct platform_device *pdev = to_platform_device(dev); 1487 struct intel_pinctrl *pctrl = platform_get_drvdata(pdev); 1488 const struct intel_community_context *communities; 1489 const struct intel_pad_context *pads; 1490 int i; 1491 1492 /* Mask all interrupts */ 1493 intel_gpio_irq_init(pctrl); 1494 1495 pads = pctrl->context.pads; 1496 for (i = 0; i < pctrl->soc->npins; i++) { 1497 const struct pinctrl_pin_desc *desc = &pctrl->soc->pins[i]; 1498 void __iomem *padcfg; 1499 u32 val; 1500 1501 if (!intel_pinctrl_should_save(pctrl, desc->number)) 1502 continue; 1503 1504 padcfg = intel_get_padcfg(pctrl, desc->number, PADCFG0); 1505 val = readl(padcfg) & ~PADCFG0_GPIORXSTATE; 1506 if (val != pads[i].padcfg0) { 1507 writel(pads[i].padcfg0, padcfg); 1508 dev_dbg(dev, "restored pin %u padcfg0 %#08x\n", 1509 desc->number, readl(padcfg)); 1510 } 1511 1512 padcfg = intel_get_padcfg(pctrl, desc->number, PADCFG1); 1513 val = readl(padcfg); 1514 if (val != pads[i].padcfg1) { 1515 writel(pads[i].padcfg1, padcfg); 1516 dev_dbg(dev, "restored pin %u padcfg1 %#08x\n", 1517 desc->number, readl(padcfg)); 1518 } 1519 1520 padcfg = intel_get_padcfg(pctrl, desc->number, PADCFG2); 1521 if (padcfg) { 1522 val = readl(padcfg); 1523 if (val != pads[i].padcfg2) { 1524 writel(pads[i].padcfg2, padcfg); 1525 dev_dbg(dev, "restored pin %u padcfg2 %#08x\n", 1526 desc->number, readl(padcfg)); 1527 } 1528 } 1529 } 1530 1531 communities = pctrl->context.communities; 1532 for (i = 0; i < pctrl->ncommunities; i++) { 1533 struct intel_community *community = &pctrl->communities[i]; 1534 void __iomem *base; 1535 unsigned gpp; 1536 1537 base = community->regs + community->ie_offset; 1538 for (gpp = 0; gpp < community->ngpps; gpp++) { 1539 writel(communities[i].intmask[gpp], base + gpp * 4); 1540 dev_dbg(dev, "restored mask %d/%u %#08x\n", i, gpp, 1541 readl(base + gpp * 4)); 1542 } 1543 } 1544 1545 return 0; 1546 } 1547 EXPORT_SYMBOL_GPL(intel_pinctrl_resume); 1548 #endif 1549 1550 MODULE_AUTHOR("Mathias Nyman <mathias.nyman@linux.intel.com>"); 1551 MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>"); 1552 MODULE_DESCRIPTION("Intel pinctrl/GPIO core driver"); 1553 MODULE_LICENSE("GPL v2"); 1554