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/acpi.h> 11 #include <linux/gpio/driver.h> 12 #include <linux/interrupt.h> 13 #include <linux/log2.h> 14 #include <linux/module.h> 15 #include <linux/platform_device.h> 16 #include <linux/property.h> 17 #include <linux/time.h> 18 19 #include <linux/pinctrl/pinctrl.h> 20 #include <linux/pinctrl/pinmux.h> 21 #include <linux/pinctrl/pinconf.h> 22 #include <linux/pinctrl/pinconf-generic.h> 23 24 #include "../core.h" 25 #include "pinctrl-intel.h" 26 27 /* Offset from regs */ 28 #define REVID 0x000 29 #define REVID_SHIFT 16 30 #define REVID_MASK GENMASK(31, 16) 31 32 #define PADBAR 0x00c 33 34 #define PADOWN_BITS 4 35 #define PADOWN_SHIFT(p) ((p) % 8 * PADOWN_BITS) 36 #define PADOWN_MASK(p) (GENMASK(3, 0) << PADOWN_SHIFT(p)) 37 #define PADOWN_GPP(p) ((p) / 8) 38 39 /* Offset from pad_regs */ 40 #define PADCFG0 0x000 41 #define PADCFG0_RXEVCFG_SHIFT 25 42 #define PADCFG0_RXEVCFG_MASK GENMASK(26, 25) 43 #define PADCFG0_RXEVCFG_LEVEL 0 44 #define PADCFG0_RXEVCFG_EDGE 1 45 #define PADCFG0_RXEVCFG_DISABLED 2 46 #define PADCFG0_RXEVCFG_EDGE_BOTH 3 47 #define PADCFG0_PREGFRXSEL BIT(24) 48 #define PADCFG0_RXINV BIT(23) 49 #define PADCFG0_GPIROUTIOXAPIC BIT(20) 50 #define PADCFG0_GPIROUTSCI BIT(19) 51 #define PADCFG0_GPIROUTSMI BIT(18) 52 #define PADCFG0_GPIROUTNMI BIT(17) 53 #define PADCFG0_PMODE_SHIFT 10 54 #define PADCFG0_PMODE_MASK GENMASK(13, 10) 55 #define PADCFG0_PMODE_GPIO 0 56 #define PADCFG0_GPIORXDIS BIT(9) 57 #define PADCFG0_GPIOTXDIS BIT(8) 58 #define PADCFG0_GPIORXSTATE BIT(1) 59 #define PADCFG0_GPIOTXSTATE BIT(0) 60 61 #define PADCFG1 0x004 62 #define PADCFG1_TERM_UP BIT(13) 63 #define PADCFG1_TERM_SHIFT 10 64 #define PADCFG1_TERM_MASK GENMASK(12, 10) 65 #define PADCFG1_TERM_20K 4 66 #define PADCFG1_TERM_2K 3 67 #define PADCFG1_TERM_5K 2 68 #define PADCFG1_TERM_1K 1 69 70 #define PADCFG2 0x008 71 #define PADCFG2_DEBEN BIT(0) 72 #define PADCFG2_DEBOUNCE_SHIFT 1 73 #define PADCFG2_DEBOUNCE_MASK GENMASK(4, 1) 74 75 #define DEBOUNCE_PERIOD_NSEC 31250 76 77 struct intel_pad_context { 78 u32 padcfg0; 79 u32 padcfg1; 80 u32 padcfg2; 81 }; 82 83 struct intel_community_context { 84 u32 *intmask; 85 u32 *hostown; 86 }; 87 88 #define pin_to_padno(c, p) ((p) - (c)->pin_base) 89 #define padgroup_offset(g, p) ((p) - (g)->base) 90 91 static struct intel_community *intel_get_community(struct intel_pinctrl *pctrl, 92 unsigned int pin) 93 { 94 struct intel_community *community; 95 int i; 96 97 for (i = 0; i < pctrl->ncommunities; i++) { 98 community = &pctrl->communities[i]; 99 if (pin >= community->pin_base && 100 pin < community->pin_base + community->npins) 101 return community; 102 } 103 104 dev_warn(pctrl->dev, "failed to find community for pin %u\n", pin); 105 return NULL; 106 } 107 108 static const struct intel_padgroup * 109 intel_community_get_padgroup(const struct intel_community *community, 110 unsigned int pin) 111 { 112 int i; 113 114 for (i = 0; i < community->ngpps; i++) { 115 const struct intel_padgroup *padgrp = &community->gpps[i]; 116 117 if (pin >= padgrp->base && pin < padgrp->base + padgrp->size) 118 return padgrp; 119 } 120 121 return NULL; 122 } 123 124 static void __iomem *intel_get_padcfg(struct intel_pinctrl *pctrl, 125 unsigned int pin, unsigned int reg) 126 { 127 const struct intel_community *community; 128 unsigned int padno; 129 size_t nregs; 130 131 community = intel_get_community(pctrl, pin); 132 if (!community) 133 return NULL; 134 135 padno = pin_to_padno(community, pin); 136 nregs = (community->features & PINCTRL_FEATURE_DEBOUNCE) ? 4 : 2; 137 138 if (reg >= nregs * 4) 139 return NULL; 140 141 return community->pad_regs + reg + padno * nregs * 4; 142 } 143 144 static bool intel_pad_owned_by_host(struct intel_pinctrl *pctrl, unsigned int pin) 145 { 146 const struct intel_community *community; 147 const struct intel_padgroup *padgrp; 148 unsigned int gpp, offset, gpp_offset; 149 void __iomem *padown; 150 151 community = intel_get_community(pctrl, pin); 152 if (!community) 153 return false; 154 if (!community->padown_offset) 155 return true; 156 157 padgrp = intel_community_get_padgroup(community, pin); 158 if (!padgrp) 159 return false; 160 161 gpp_offset = padgroup_offset(padgrp, pin); 162 gpp = PADOWN_GPP(gpp_offset); 163 offset = community->padown_offset + padgrp->padown_num * 4 + gpp * 4; 164 padown = community->regs + offset; 165 166 return !(readl(padown) & PADOWN_MASK(gpp_offset)); 167 } 168 169 static bool intel_pad_acpi_mode(struct intel_pinctrl *pctrl, unsigned int pin) 170 { 171 const struct intel_community *community; 172 const struct intel_padgroup *padgrp; 173 unsigned int offset, gpp_offset; 174 void __iomem *hostown; 175 176 community = intel_get_community(pctrl, pin); 177 if (!community) 178 return true; 179 if (!community->hostown_offset) 180 return false; 181 182 padgrp = intel_community_get_padgroup(community, pin); 183 if (!padgrp) 184 return true; 185 186 gpp_offset = padgroup_offset(padgrp, pin); 187 offset = community->hostown_offset + padgrp->reg_num * 4; 188 hostown = community->regs + offset; 189 190 return !(readl(hostown) & BIT(gpp_offset)); 191 } 192 193 /** 194 * enum - Locking variants of the pad configuration 195 * 196 * @PAD_UNLOCKED: pad is fully controlled by the configuration registers 197 * @PAD_LOCKED: pad configuration registers, except TX state, are locked 198 * @PAD_LOCKED_TX: pad configuration TX state is locked 199 * @PAD_LOCKED_FULL: pad configuration registers are locked completely 200 * 201 * Locking is considered as read-only mode for corresponding registers and 202 * their respective fields. That said, TX state bit is locked separately from 203 * the main locking scheme. 204 */ 205 enum { 206 PAD_UNLOCKED = 0, 207 PAD_LOCKED = 1, 208 PAD_LOCKED_TX = 2, 209 PAD_LOCKED_FULL = PAD_LOCKED | PAD_LOCKED_TX, 210 }; 211 212 static int intel_pad_locked(struct intel_pinctrl *pctrl, unsigned int pin) 213 { 214 struct intel_community *community; 215 const struct intel_padgroup *padgrp; 216 unsigned int offset, gpp_offset; 217 u32 value; 218 int ret = PAD_UNLOCKED; 219 220 community = intel_get_community(pctrl, pin); 221 if (!community) 222 return PAD_LOCKED_FULL; 223 if (!community->padcfglock_offset) 224 return PAD_UNLOCKED; 225 226 padgrp = intel_community_get_padgroup(community, pin); 227 if (!padgrp) 228 return PAD_LOCKED_FULL; 229 230 gpp_offset = padgroup_offset(padgrp, pin); 231 232 /* 233 * If PADCFGLOCK and PADCFGLOCKTX bits are both clear for this pad, 234 * the pad is considered unlocked. Any other case means that it is 235 * either fully or partially locked. 236 */ 237 offset = community->padcfglock_offset + 0 + padgrp->reg_num * 8; 238 value = readl(community->regs + offset); 239 if (value & BIT(gpp_offset)) 240 ret |= PAD_LOCKED; 241 242 offset = community->padcfglock_offset + 4 + padgrp->reg_num * 8; 243 value = readl(community->regs + offset); 244 if (value & BIT(gpp_offset)) 245 ret |= PAD_LOCKED_TX; 246 247 return ret; 248 } 249 250 static bool intel_pad_is_unlocked(struct intel_pinctrl *pctrl, unsigned int pin) 251 { 252 return (intel_pad_locked(pctrl, pin) & PAD_LOCKED) == PAD_UNLOCKED; 253 } 254 255 static bool intel_pad_usable(struct intel_pinctrl *pctrl, unsigned int pin) 256 { 257 return intel_pad_owned_by_host(pctrl, pin) && intel_pad_is_unlocked(pctrl, pin); 258 } 259 260 static int intel_get_groups_count(struct pinctrl_dev *pctldev) 261 { 262 struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); 263 264 return pctrl->soc->ngroups; 265 } 266 267 static const char *intel_get_group_name(struct pinctrl_dev *pctldev, 268 unsigned int group) 269 { 270 struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); 271 272 return pctrl->soc->groups[group].name; 273 } 274 275 static int intel_get_group_pins(struct pinctrl_dev *pctldev, unsigned int group, 276 const unsigned int **pins, unsigned int *npins) 277 { 278 struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); 279 280 *pins = pctrl->soc->groups[group].pins; 281 *npins = pctrl->soc->groups[group].npins; 282 return 0; 283 } 284 285 static void intel_pin_dbg_show(struct pinctrl_dev *pctldev, struct seq_file *s, 286 unsigned int pin) 287 { 288 struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); 289 void __iomem *padcfg; 290 u32 cfg0, cfg1, mode; 291 int locked; 292 bool acpi; 293 294 if (!intel_pad_owned_by_host(pctrl, pin)) { 295 seq_puts(s, "not available"); 296 return; 297 } 298 299 cfg0 = readl(intel_get_padcfg(pctrl, pin, PADCFG0)); 300 cfg1 = readl(intel_get_padcfg(pctrl, pin, PADCFG1)); 301 302 mode = (cfg0 & PADCFG0_PMODE_MASK) >> PADCFG0_PMODE_SHIFT; 303 if (mode == PADCFG0_PMODE_GPIO) 304 seq_puts(s, "GPIO "); 305 else 306 seq_printf(s, "mode %d ", mode); 307 308 seq_printf(s, "0x%08x 0x%08x", cfg0, cfg1); 309 310 /* Dump the additional PADCFG registers if available */ 311 padcfg = intel_get_padcfg(pctrl, pin, PADCFG2); 312 if (padcfg) 313 seq_printf(s, " 0x%08x", readl(padcfg)); 314 315 locked = intel_pad_locked(pctrl, pin); 316 acpi = intel_pad_acpi_mode(pctrl, pin); 317 318 if (locked || acpi) { 319 seq_puts(s, " ["); 320 if (locked) 321 seq_puts(s, "LOCKED"); 322 if ((locked & PAD_LOCKED_FULL) == PAD_LOCKED_TX) 323 seq_puts(s, " tx"); 324 else if ((locked & PAD_LOCKED_FULL) == PAD_LOCKED_FULL) 325 seq_puts(s, " full"); 326 327 if (locked && acpi) 328 seq_puts(s, ", "); 329 330 if (acpi) 331 seq_puts(s, "ACPI"); 332 seq_puts(s, "]"); 333 } 334 } 335 336 static const struct pinctrl_ops intel_pinctrl_ops = { 337 .get_groups_count = intel_get_groups_count, 338 .get_group_name = intel_get_group_name, 339 .get_group_pins = intel_get_group_pins, 340 .pin_dbg_show = intel_pin_dbg_show, 341 }; 342 343 static int intel_get_functions_count(struct pinctrl_dev *pctldev) 344 { 345 struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); 346 347 return pctrl->soc->nfunctions; 348 } 349 350 static const char *intel_get_function_name(struct pinctrl_dev *pctldev, 351 unsigned int function) 352 { 353 struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); 354 355 return pctrl->soc->functions[function].name; 356 } 357 358 static int intel_get_function_groups(struct pinctrl_dev *pctldev, 359 unsigned int function, 360 const char * const **groups, 361 unsigned int * const ngroups) 362 { 363 struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); 364 365 *groups = pctrl->soc->functions[function].groups; 366 *ngroups = pctrl->soc->functions[function].ngroups; 367 return 0; 368 } 369 370 static int intel_pinmux_set_mux(struct pinctrl_dev *pctldev, 371 unsigned int function, unsigned int group) 372 { 373 struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); 374 const struct intel_pingroup *grp = &pctrl->soc->groups[group]; 375 unsigned long flags; 376 int i; 377 378 raw_spin_lock_irqsave(&pctrl->lock, flags); 379 380 /* 381 * All pins in the groups needs to be accessible and writable 382 * before we can enable the mux for this group. 383 */ 384 for (i = 0; i < grp->npins; i++) { 385 if (!intel_pad_usable(pctrl, grp->pins[i])) { 386 raw_spin_unlock_irqrestore(&pctrl->lock, flags); 387 return -EBUSY; 388 } 389 } 390 391 /* Now enable the mux setting for each pin in the group */ 392 for (i = 0; i < grp->npins; i++) { 393 void __iomem *padcfg0; 394 u32 value; 395 396 padcfg0 = intel_get_padcfg(pctrl, grp->pins[i], PADCFG0); 397 value = readl(padcfg0); 398 399 value &= ~PADCFG0_PMODE_MASK; 400 401 if (grp->modes) 402 value |= grp->modes[i] << PADCFG0_PMODE_SHIFT; 403 else 404 value |= grp->mode << PADCFG0_PMODE_SHIFT; 405 406 writel(value, padcfg0); 407 } 408 409 raw_spin_unlock_irqrestore(&pctrl->lock, flags); 410 411 return 0; 412 } 413 414 static void __intel_gpio_set_direction(void __iomem *padcfg0, bool input) 415 { 416 u32 value; 417 418 value = readl(padcfg0); 419 if (input) { 420 value &= ~PADCFG0_GPIORXDIS; 421 value |= PADCFG0_GPIOTXDIS; 422 } else { 423 value &= ~PADCFG0_GPIOTXDIS; 424 value |= PADCFG0_GPIORXDIS; 425 } 426 writel(value, padcfg0); 427 } 428 429 static int intel_gpio_get_gpio_mode(void __iomem *padcfg0) 430 { 431 return (readl(padcfg0) & PADCFG0_PMODE_MASK) >> PADCFG0_PMODE_SHIFT; 432 } 433 434 static void intel_gpio_set_gpio_mode(void __iomem *padcfg0) 435 { 436 u32 value; 437 438 /* Put the pad into GPIO mode */ 439 value = readl(padcfg0) & ~PADCFG0_PMODE_MASK; 440 /* Disable SCI/SMI/NMI generation */ 441 value &= ~(PADCFG0_GPIROUTIOXAPIC | PADCFG0_GPIROUTSCI); 442 value &= ~(PADCFG0_GPIROUTSMI | PADCFG0_GPIROUTNMI); 443 writel(value, padcfg0); 444 } 445 446 static int intel_gpio_request_enable(struct pinctrl_dev *pctldev, 447 struct pinctrl_gpio_range *range, 448 unsigned int pin) 449 { 450 struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); 451 void __iomem *padcfg0; 452 unsigned long flags; 453 454 raw_spin_lock_irqsave(&pctrl->lock, flags); 455 456 if (!intel_pad_owned_by_host(pctrl, pin)) { 457 raw_spin_unlock_irqrestore(&pctrl->lock, flags); 458 return -EBUSY; 459 } 460 461 if (!intel_pad_is_unlocked(pctrl, pin)) { 462 raw_spin_unlock_irqrestore(&pctrl->lock, flags); 463 return 0; 464 } 465 466 padcfg0 = intel_get_padcfg(pctrl, pin, PADCFG0); 467 468 /* 469 * If pin is already configured in GPIO mode, we assume that 470 * firmware provides correct settings. In such case we avoid 471 * potential glitches on the pin. Otherwise, for the pin in 472 * alternative mode, consumer has to supply respective flags. 473 */ 474 if (intel_gpio_get_gpio_mode(padcfg0) == PADCFG0_PMODE_GPIO) { 475 raw_spin_unlock_irqrestore(&pctrl->lock, flags); 476 return 0; 477 } 478 479 intel_gpio_set_gpio_mode(padcfg0); 480 481 /* Disable TX buffer and enable RX (this will be input) */ 482 __intel_gpio_set_direction(padcfg0, true); 483 484 raw_spin_unlock_irqrestore(&pctrl->lock, flags); 485 486 return 0; 487 } 488 489 static int intel_gpio_set_direction(struct pinctrl_dev *pctldev, 490 struct pinctrl_gpio_range *range, 491 unsigned int pin, bool input) 492 { 493 struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); 494 void __iomem *padcfg0; 495 unsigned long flags; 496 497 raw_spin_lock_irqsave(&pctrl->lock, flags); 498 499 padcfg0 = intel_get_padcfg(pctrl, pin, PADCFG0); 500 __intel_gpio_set_direction(padcfg0, input); 501 502 raw_spin_unlock_irqrestore(&pctrl->lock, flags); 503 504 return 0; 505 } 506 507 static const struct pinmux_ops intel_pinmux_ops = { 508 .get_functions_count = intel_get_functions_count, 509 .get_function_name = intel_get_function_name, 510 .get_function_groups = intel_get_function_groups, 511 .set_mux = intel_pinmux_set_mux, 512 .gpio_request_enable = intel_gpio_request_enable, 513 .gpio_set_direction = intel_gpio_set_direction, 514 }; 515 516 static int intel_config_get(struct pinctrl_dev *pctldev, unsigned int pin, 517 unsigned long *config) 518 { 519 struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); 520 enum pin_config_param param = pinconf_to_config_param(*config); 521 const struct intel_community *community; 522 u32 value, term; 523 u32 arg = 0; 524 525 if (!intel_pad_owned_by_host(pctrl, pin)) 526 return -ENOTSUPP; 527 528 community = intel_get_community(pctrl, pin); 529 value = readl(intel_get_padcfg(pctrl, pin, PADCFG1)); 530 term = (value & PADCFG1_TERM_MASK) >> PADCFG1_TERM_SHIFT; 531 532 switch (param) { 533 case PIN_CONFIG_BIAS_DISABLE: 534 if (term) 535 return -EINVAL; 536 break; 537 538 case PIN_CONFIG_BIAS_PULL_UP: 539 if (!term || !(value & PADCFG1_TERM_UP)) 540 return -EINVAL; 541 542 switch (term) { 543 case PADCFG1_TERM_1K: 544 arg = 1000; 545 break; 546 case PADCFG1_TERM_2K: 547 arg = 2000; 548 break; 549 case PADCFG1_TERM_5K: 550 arg = 5000; 551 break; 552 case PADCFG1_TERM_20K: 553 arg = 20000; 554 break; 555 } 556 557 break; 558 559 case PIN_CONFIG_BIAS_PULL_DOWN: 560 if (!term || value & PADCFG1_TERM_UP) 561 return -EINVAL; 562 563 switch (term) { 564 case PADCFG1_TERM_1K: 565 if (!(community->features & PINCTRL_FEATURE_1K_PD)) 566 return -EINVAL; 567 arg = 1000; 568 break; 569 case PADCFG1_TERM_5K: 570 arg = 5000; 571 break; 572 case PADCFG1_TERM_20K: 573 arg = 20000; 574 break; 575 } 576 577 break; 578 579 case PIN_CONFIG_INPUT_DEBOUNCE: { 580 void __iomem *padcfg2; 581 u32 v; 582 583 padcfg2 = intel_get_padcfg(pctrl, pin, PADCFG2); 584 if (!padcfg2) 585 return -ENOTSUPP; 586 587 v = readl(padcfg2); 588 if (!(v & PADCFG2_DEBEN)) 589 return -EINVAL; 590 591 v = (v & PADCFG2_DEBOUNCE_MASK) >> PADCFG2_DEBOUNCE_SHIFT; 592 arg = BIT(v) * DEBOUNCE_PERIOD_NSEC / NSEC_PER_USEC; 593 594 break; 595 } 596 597 default: 598 return -ENOTSUPP; 599 } 600 601 *config = pinconf_to_config_packed(param, arg); 602 return 0; 603 } 604 605 static int intel_config_set_pull(struct intel_pinctrl *pctrl, unsigned int pin, 606 unsigned long config) 607 { 608 unsigned int param = pinconf_to_config_param(config); 609 unsigned int arg = pinconf_to_config_argument(config); 610 const struct intel_community *community; 611 void __iomem *padcfg1; 612 unsigned long flags; 613 int ret = 0; 614 u32 value; 615 616 raw_spin_lock_irqsave(&pctrl->lock, flags); 617 618 community = intel_get_community(pctrl, pin); 619 padcfg1 = intel_get_padcfg(pctrl, pin, PADCFG1); 620 value = readl(padcfg1); 621 622 switch (param) { 623 case PIN_CONFIG_BIAS_DISABLE: 624 value &= ~(PADCFG1_TERM_MASK | PADCFG1_TERM_UP); 625 break; 626 627 case PIN_CONFIG_BIAS_PULL_UP: 628 value &= ~PADCFG1_TERM_MASK; 629 630 value |= PADCFG1_TERM_UP; 631 632 switch (arg) { 633 case 20000: 634 value |= PADCFG1_TERM_20K << PADCFG1_TERM_SHIFT; 635 break; 636 case 5000: 637 value |= PADCFG1_TERM_5K << PADCFG1_TERM_SHIFT; 638 break; 639 case 2000: 640 value |= PADCFG1_TERM_2K << PADCFG1_TERM_SHIFT; 641 break; 642 case 1000: 643 value |= PADCFG1_TERM_1K << PADCFG1_TERM_SHIFT; 644 break; 645 default: 646 ret = -EINVAL; 647 } 648 649 break; 650 651 case PIN_CONFIG_BIAS_PULL_DOWN: 652 value &= ~(PADCFG1_TERM_UP | PADCFG1_TERM_MASK); 653 654 switch (arg) { 655 case 20000: 656 value |= PADCFG1_TERM_20K << PADCFG1_TERM_SHIFT; 657 break; 658 case 5000: 659 value |= PADCFG1_TERM_5K << PADCFG1_TERM_SHIFT; 660 break; 661 case 1000: 662 if (!(community->features & PINCTRL_FEATURE_1K_PD)) { 663 ret = -EINVAL; 664 break; 665 } 666 value |= PADCFG1_TERM_1K << PADCFG1_TERM_SHIFT; 667 break; 668 default: 669 ret = -EINVAL; 670 } 671 672 break; 673 } 674 675 if (!ret) 676 writel(value, padcfg1); 677 678 raw_spin_unlock_irqrestore(&pctrl->lock, flags); 679 680 return ret; 681 } 682 683 static int intel_config_set_debounce(struct intel_pinctrl *pctrl, 684 unsigned int pin, unsigned int debounce) 685 { 686 void __iomem *padcfg0, *padcfg2; 687 unsigned long flags; 688 u32 value0, value2; 689 int ret = 0; 690 691 padcfg2 = intel_get_padcfg(pctrl, pin, PADCFG2); 692 if (!padcfg2) 693 return -ENOTSUPP; 694 695 padcfg0 = intel_get_padcfg(pctrl, pin, PADCFG0); 696 697 raw_spin_lock_irqsave(&pctrl->lock, flags); 698 699 value0 = readl(padcfg0); 700 value2 = readl(padcfg2); 701 702 /* Disable glitch filter and debouncer */ 703 value0 &= ~PADCFG0_PREGFRXSEL; 704 value2 &= ~(PADCFG2_DEBEN | PADCFG2_DEBOUNCE_MASK); 705 706 if (debounce) { 707 unsigned long v; 708 709 v = order_base_2(debounce * NSEC_PER_USEC / DEBOUNCE_PERIOD_NSEC); 710 if (v < 3 || v > 15) { 711 ret = -EINVAL; 712 goto exit_unlock; 713 } else { 714 /* Enable glitch filter and debouncer */ 715 value0 |= PADCFG0_PREGFRXSEL; 716 value2 |= v << PADCFG2_DEBOUNCE_SHIFT; 717 value2 |= PADCFG2_DEBEN; 718 } 719 } 720 721 writel(value0, padcfg0); 722 writel(value2, padcfg2); 723 724 exit_unlock: 725 raw_spin_unlock_irqrestore(&pctrl->lock, flags); 726 727 return ret; 728 } 729 730 static int intel_config_set(struct pinctrl_dev *pctldev, unsigned int pin, 731 unsigned long *configs, unsigned int nconfigs) 732 { 733 struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); 734 int i, ret; 735 736 if (!intel_pad_usable(pctrl, pin)) 737 return -ENOTSUPP; 738 739 for (i = 0; i < nconfigs; i++) { 740 switch (pinconf_to_config_param(configs[i])) { 741 case PIN_CONFIG_BIAS_DISABLE: 742 case PIN_CONFIG_BIAS_PULL_UP: 743 case PIN_CONFIG_BIAS_PULL_DOWN: 744 ret = intel_config_set_pull(pctrl, pin, configs[i]); 745 if (ret) 746 return ret; 747 break; 748 749 case PIN_CONFIG_INPUT_DEBOUNCE: 750 ret = intel_config_set_debounce(pctrl, pin, 751 pinconf_to_config_argument(configs[i])); 752 if (ret) 753 return ret; 754 break; 755 756 default: 757 return -ENOTSUPP; 758 } 759 } 760 761 return 0; 762 } 763 764 static const struct pinconf_ops intel_pinconf_ops = { 765 .is_generic = true, 766 .pin_config_get = intel_config_get, 767 .pin_config_set = intel_config_set, 768 }; 769 770 static const struct pinctrl_desc intel_pinctrl_desc = { 771 .pctlops = &intel_pinctrl_ops, 772 .pmxops = &intel_pinmux_ops, 773 .confops = &intel_pinconf_ops, 774 .owner = THIS_MODULE, 775 }; 776 777 /** 778 * intel_gpio_to_pin() - Translate from GPIO offset to pin number 779 * @pctrl: Pinctrl structure 780 * @offset: GPIO offset from gpiolib 781 * @community: Community is filled here if not %NULL 782 * @padgrp: Pad group is filled here if not %NULL 783 * 784 * When coming through gpiolib irqchip, the GPIO offset is not 785 * automatically translated to pinctrl pin number. This function can be 786 * used to find out the corresponding pinctrl pin. 787 */ 788 static int intel_gpio_to_pin(struct intel_pinctrl *pctrl, unsigned int offset, 789 const struct intel_community **community, 790 const struct intel_padgroup **padgrp) 791 { 792 int i; 793 794 for (i = 0; i < pctrl->ncommunities; i++) { 795 const struct intel_community *comm = &pctrl->communities[i]; 796 int j; 797 798 for (j = 0; j < comm->ngpps; j++) { 799 const struct intel_padgroup *pgrp = &comm->gpps[j]; 800 801 if (pgrp->gpio_base < 0) 802 continue; 803 804 if (offset >= pgrp->gpio_base && 805 offset < pgrp->gpio_base + pgrp->size) { 806 int pin; 807 808 pin = pgrp->base + offset - pgrp->gpio_base; 809 if (community) 810 *community = comm; 811 if (padgrp) 812 *padgrp = pgrp; 813 814 return pin; 815 } 816 } 817 } 818 819 return -EINVAL; 820 } 821 822 /** 823 * intel_pin_to_gpio() - Translate from pin number to GPIO offset 824 * @pctrl: Pinctrl structure 825 * @pin: pin number 826 * 827 * Translate the pin number of pinctrl to GPIO offset 828 */ 829 static __maybe_unused int intel_pin_to_gpio(struct intel_pinctrl *pctrl, int pin) 830 { 831 const struct intel_community *community; 832 const struct intel_padgroup *padgrp; 833 834 community = intel_get_community(pctrl, pin); 835 if (!community) 836 return -EINVAL; 837 838 padgrp = intel_community_get_padgroup(community, pin); 839 if (!padgrp) 840 return -EINVAL; 841 842 return pin - padgrp->base + padgrp->gpio_base; 843 } 844 845 static int intel_gpio_get(struct gpio_chip *chip, unsigned int offset) 846 { 847 struct intel_pinctrl *pctrl = gpiochip_get_data(chip); 848 void __iomem *reg; 849 u32 padcfg0; 850 int pin; 851 852 pin = intel_gpio_to_pin(pctrl, offset, NULL, NULL); 853 if (pin < 0) 854 return -EINVAL; 855 856 reg = intel_get_padcfg(pctrl, pin, PADCFG0); 857 if (!reg) 858 return -EINVAL; 859 860 padcfg0 = readl(reg); 861 if (!(padcfg0 & PADCFG0_GPIOTXDIS)) 862 return !!(padcfg0 & PADCFG0_GPIOTXSTATE); 863 864 return !!(padcfg0 & PADCFG0_GPIORXSTATE); 865 } 866 867 static void intel_gpio_set(struct gpio_chip *chip, unsigned int offset, 868 int value) 869 { 870 struct intel_pinctrl *pctrl = gpiochip_get_data(chip); 871 unsigned long flags; 872 void __iomem *reg; 873 u32 padcfg0; 874 int pin; 875 876 pin = intel_gpio_to_pin(pctrl, offset, NULL, NULL); 877 if (pin < 0) 878 return; 879 880 reg = intel_get_padcfg(pctrl, pin, PADCFG0); 881 if (!reg) 882 return; 883 884 raw_spin_lock_irqsave(&pctrl->lock, flags); 885 padcfg0 = readl(reg); 886 if (value) 887 padcfg0 |= PADCFG0_GPIOTXSTATE; 888 else 889 padcfg0 &= ~PADCFG0_GPIOTXSTATE; 890 writel(padcfg0, reg); 891 raw_spin_unlock_irqrestore(&pctrl->lock, flags); 892 } 893 894 static int intel_gpio_get_direction(struct gpio_chip *chip, unsigned int offset) 895 { 896 struct intel_pinctrl *pctrl = gpiochip_get_data(chip); 897 void __iomem *reg; 898 u32 padcfg0; 899 int pin; 900 901 pin = intel_gpio_to_pin(pctrl, offset, NULL, NULL); 902 if (pin < 0) 903 return -EINVAL; 904 905 reg = intel_get_padcfg(pctrl, pin, PADCFG0); 906 if (!reg) 907 return -EINVAL; 908 909 padcfg0 = readl(reg); 910 911 if (padcfg0 & PADCFG0_PMODE_MASK) 912 return -EINVAL; 913 914 if (padcfg0 & PADCFG0_GPIOTXDIS) 915 return GPIO_LINE_DIRECTION_IN; 916 917 return GPIO_LINE_DIRECTION_OUT; 918 } 919 920 static int intel_gpio_direction_input(struct gpio_chip *chip, unsigned int offset) 921 { 922 return pinctrl_gpio_direction_input(chip->base + offset); 923 } 924 925 static int intel_gpio_direction_output(struct gpio_chip *chip, unsigned int offset, 926 int value) 927 { 928 intel_gpio_set(chip, offset, value); 929 return pinctrl_gpio_direction_output(chip->base + offset); 930 } 931 932 static const struct gpio_chip intel_gpio_chip = { 933 .owner = THIS_MODULE, 934 .request = gpiochip_generic_request, 935 .free = gpiochip_generic_free, 936 .get_direction = intel_gpio_get_direction, 937 .direction_input = intel_gpio_direction_input, 938 .direction_output = intel_gpio_direction_output, 939 .get = intel_gpio_get, 940 .set = intel_gpio_set, 941 .set_config = gpiochip_generic_config, 942 }; 943 944 static void intel_gpio_irq_ack(struct irq_data *d) 945 { 946 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 947 struct intel_pinctrl *pctrl = gpiochip_get_data(gc); 948 const struct intel_community *community; 949 const struct intel_padgroup *padgrp; 950 int pin; 951 952 pin = intel_gpio_to_pin(pctrl, irqd_to_hwirq(d), &community, &padgrp); 953 if (pin >= 0) { 954 unsigned int gpp, gpp_offset, is_offset; 955 956 gpp = padgrp->reg_num; 957 gpp_offset = padgroup_offset(padgrp, pin); 958 is_offset = community->is_offset + gpp * 4; 959 960 raw_spin_lock(&pctrl->lock); 961 writel(BIT(gpp_offset), community->regs + is_offset); 962 raw_spin_unlock(&pctrl->lock); 963 } 964 } 965 966 static void intel_gpio_irq_mask_unmask(struct irq_data *d, bool mask) 967 { 968 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 969 struct intel_pinctrl *pctrl = gpiochip_get_data(gc); 970 const struct intel_community *community; 971 const struct intel_padgroup *padgrp; 972 int pin; 973 974 pin = intel_gpio_to_pin(pctrl, irqd_to_hwirq(d), &community, &padgrp); 975 if (pin >= 0) { 976 unsigned int gpp, gpp_offset; 977 unsigned long flags; 978 void __iomem *reg, *is; 979 u32 value; 980 981 gpp = padgrp->reg_num; 982 gpp_offset = padgroup_offset(padgrp, pin); 983 984 reg = community->regs + community->ie_offset + gpp * 4; 985 is = community->regs + community->is_offset + gpp * 4; 986 987 raw_spin_lock_irqsave(&pctrl->lock, flags); 988 989 /* Clear interrupt status first to avoid unexpected interrupt */ 990 writel(BIT(gpp_offset), is); 991 992 value = readl(reg); 993 if (mask) 994 value &= ~BIT(gpp_offset); 995 else 996 value |= BIT(gpp_offset); 997 writel(value, reg); 998 raw_spin_unlock_irqrestore(&pctrl->lock, flags); 999 } 1000 } 1001 1002 static void intel_gpio_irq_mask(struct irq_data *d) 1003 { 1004 intel_gpio_irq_mask_unmask(d, true); 1005 } 1006 1007 static void intel_gpio_irq_unmask(struct irq_data *d) 1008 { 1009 intel_gpio_irq_mask_unmask(d, false); 1010 } 1011 1012 static int intel_gpio_irq_type(struct irq_data *d, unsigned int type) 1013 { 1014 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 1015 struct intel_pinctrl *pctrl = gpiochip_get_data(gc); 1016 unsigned int pin = intel_gpio_to_pin(pctrl, irqd_to_hwirq(d), NULL, NULL); 1017 unsigned long flags; 1018 void __iomem *reg; 1019 u32 value; 1020 1021 reg = intel_get_padcfg(pctrl, pin, PADCFG0); 1022 if (!reg) 1023 return -EINVAL; 1024 1025 /* 1026 * If the pin is in ACPI mode it is still usable as a GPIO but it 1027 * cannot be used as IRQ because GPI_IS status bit will not be 1028 * updated by the host controller hardware. 1029 */ 1030 if (intel_pad_acpi_mode(pctrl, pin)) { 1031 dev_warn(pctrl->dev, "pin %u cannot be used as IRQ\n", pin); 1032 return -EPERM; 1033 } 1034 1035 raw_spin_lock_irqsave(&pctrl->lock, flags); 1036 1037 intel_gpio_set_gpio_mode(reg); 1038 1039 value = readl(reg); 1040 1041 value &= ~(PADCFG0_RXEVCFG_MASK | PADCFG0_RXINV); 1042 1043 if ((type & IRQ_TYPE_EDGE_BOTH) == IRQ_TYPE_EDGE_BOTH) { 1044 value |= PADCFG0_RXEVCFG_EDGE_BOTH << PADCFG0_RXEVCFG_SHIFT; 1045 } else if (type & IRQ_TYPE_EDGE_FALLING) { 1046 value |= PADCFG0_RXEVCFG_EDGE << PADCFG0_RXEVCFG_SHIFT; 1047 value |= PADCFG0_RXINV; 1048 } else if (type & IRQ_TYPE_EDGE_RISING) { 1049 value |= PADCFG0_RXEVCFG_EDGE << PADCFG0_RXEVCFG_SHIFT; 1050 } else if (type & IRQ_TYPE_LEVEL_MASK) { 1051 if (type & IRQ_TYPE_LEVEL_LOW) 1052 value |= PADCFG0_RXINV; 1053 } else { 1054 value |= PADCFG0_RXEVCFG_DISABLED << PADCFG0_RXEVCFG_SHIFT; 1055 } 1056 1057 writel(value, reg); 1058 1059 if (type & IRQ_TYPE_EDGE_BOTH) 1060 irq_set_handler_locked(d, handle_edge_irq); 1061 else if (type & IRQ_TYPE_LEVEL_MASK) 1062 irq_set_handler_locked(d, handle_level_irq); 1063 1064 raw_spin_unlock_irqrestore(&pctrl->lock, flags); 1065 1066 return 0; 1067 } 1068 1069 static int intel_gpio_irq_wake(struct irq_data *d, unsigned int on) 1070 { 1071 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 1072 struct intel_pinctrl *pctrl = gpiochip_get_data(gc); 1073 unsigned int pin = intel_gpio_to_pin(pctrl, irqd_to_hwirq(d), NULL, NULL); 1074 1075 if (on) 1076 enable_irq_wake(pctrl->irq); 1077 else 1078 disable_irq_wake(pctrl->irq); 1079 1080 dev_dbg(pctrl->dev, "%sable wake for pin %u\n", on ? "en" : "dis", pin); 1081 return 0; 1082 } 1083 1084 static irqreturn_t intel_gpio_community_irq_handler(struct intel_pinctrl *pctrl, 1085 const struct intel_community *community) 1086 { 1087 struct gpio_chip *gc = &pctrl->chip; 1088 irqreturn_t ret = IRQ_NONE; 1089 int gpp; 1090 1091 for (gpp = 0; gpp < community->ngpps; gpp++) { 1092 const struct intel_padgroup *padgrp = &community->gpps[gpp]; 1093 unsigned long pending, enabled, gpp_offset; 1094 1095 pending = readl(community->regs + community->is_offset + 1096 padgrp->reg_num * 4); 1097 enabled = readl(community->regs + community->ie_offset + 1098 padgrp->reg_num * 4); 1099 1100 /* Only interrupts that are enabled */ 1101 pending &= enabled; 1102 1103 for_each_set_bit(gpp_offset, &pending, padgrp->size) { 1104 unsigned int irq; 1105 1106 irq = irq_find_mapping(gc->irq.domain, 1107 padgrp->gpio_base + gpp_offset); 1108 generic_handle_irq(irq); 1109 1110 ret |= IRQ_HANDLED; 1111 } 1112 } 1113 1114 return ret; 1115 } 1116 1117 static irqreturn_t intel_gpio_irq(int irq, void *data) 1118 { 1119 const struct intel_community *community; 1120 struct intel_pinctrl *pctrl = data; 1121 irqreturn_t ret = IRQ_NONE; 1122 int i; 1123 1124 /* Need to check all communities for pending interrupts */ 1125 for (i = 0; i < pctrl->ncommunities; i++) { 1126 community = &pctrl->communities[i]; 1127 ret |= intel_gpio_community_irq_handler(pctrl, community); 1128 } 1129 1130 return ret; 1131 } 1132 1133 static int intel_gpio_add_community_ranges(struct intel_pinctrl *pctrl, 1134 const struct intel_community *community) 1135 { 1136 int ret = 0, i; 1137 1138 for (i = 0; i < community->ngpps; i++) { 1139 const struct intel_padgroup *gpp = &community->gpps[i]; 1140 1141 if (gpp->gpio_base < 0) 1142 continue; 1143 1144 ret = gpiochip_add_pin_range(&pctrl->chip, dev_name(pctrl->dev), 1145 gpp->gpio_base, gpp->base, 1146 gpp->size); 1147 if (ret) 1148 return ret; 1149 } 1150 1151 return ret; 1152 } 1153 1154 static int intel_gpio_add_pin_ranges(struct gpio_chip *gc) 1155 { 1156 struct intel_pinctrl *pctrl = gpiochip_get_data(gc); 1157 int ret, i; 1158 1159 for (i = 0; i < pctrl->ncommunities; i++) { 1160 struct intel_community *community = &pctrl->communities[i]; 1161 1162 ret = intel_gpio_add_community_ranges(pctrl, community); 1163 if (ret) { 1164 dev_err(pctrl->dev, "failed to add GPIO pin range\n"); 1165 return ret; 1166 } 1167 } 1168 1169 return 0; 1170 } 1171 1172 static unsigned int intel_gpio_ngpio(const struct intel_pinctrl *pctrl) 1173 { 1174 const struct intel_community *community; 1175 unsigned int ngpio = 0; 1176 int i, j; 1177 1178 for (i = 0; i < pctrl->ncommunities; i++) { 1179 community = &pctrl->communities[i]; 1180 for (j = 0; j < community->ngpps; j++) { 1181 const struct intel_padgroup *gpp = &community->gpps[j]; 1182 1183 if (gpp->gpio_base < 0) 1184 continue; 1185 1186 if (gpp->gpio_base + gpp->size > ngpio) 1187 ngpio = gpp->gpio_base + gpp->size; 1188 } 1189 } 1190 1191 return ngpio; 1192 } 1193 1194 static int intel_gpio_probe(struct intel_pinctrl *pctrl, int irq) 1195 { 1196 int ret; 1197 struct gpio_irq_chip *girq; 1198 1199 pctrl->chip = intel_gpio_chip; 1200 1201 /* Setup GPIO chip */ 1202 pctrl->chip.ngpio = intel_gpio_ngpio(pctrl); 1203 pctrl->chip.label = dev_name(pctrl->dev); 1204 pctrl->chip.parent = pctrl->dev; 1205 pctrl->chip.base = -1; 1206 pctrl->chip.add_pin_ranges = intel_gpio_add_pin_ranges; 1207 pctrl->irq = irq; 1208 1209 /* Setup IRQ chip */ 1210 pctrl->irqchip.name = dev_name(pctrl->dev); 1211 pctrl->irqchip.irq_ack = intel_gpio_irq_ack; 1212 pctrl->irqchip.irq_mask = intel_gpio_irq_mask; 1213 pctrl->irqchip.irq_unmask = intel_gpio_irq_unmask; 1214 pctrl->irqchip.irq_set_type = intel_gpio_irq_type; 1215 pctrl->irqchip.irq_set_wake = intel_gpio_irq_wake; 1216 pctrl->irqchip.flags = IRQCHIP_MASK_ON_SUSPEND; 1217 1218 /* 1219 * On some platforms several GPIO controllers share the same interrupt 1220 * line. 1221 */ 1222 ret = devm_request_irq(pctrl->dev, irq, intel_gpio_irq, 1223 IRQF_SHARED | IRQF_NO_THREAD, 1224 dev_name(pctrl->dev), pctrl); 1225 if (ret) { 1226 dev_err(pctrl->dev, "failed to request interrupt\n"); 1227 return ret; 1228 } 1229 1230 girq = &pctrl->chip.irq; 1231 girq->chip = &pctrl->irqchip; 1232 /* This will let us handle the IRQ in the driver */ 1233 girq->parent_handler = NULL; 1234 girq->num_parents = 0; 1235 girq->default_type = IRQ_TYPE_NONE; 1236 girq->handler = handle_bad_irq; 1237 1238 ret = devm_gpiochip_add_data(pctrl->dev, &pctrl->chip, pctrl); 1239 if (ret) { 1240 dev_err(pctrl->dev, "failed to register gpiochip\n"); 1241 return ret; 1242 } 1243 1244 return 0; 1245 } 1246 1247 static int intel_pinctrl_add_padgroups(struct intel_pinctrl *pctrl, 1248 struct intel_community *community) 1249 { 1250 struct intel_padgroup *gpps; 1251 unsigned int npins = community->npins; 1252 unsigned int padown_num = 0; 1253 size_t ngpps, i; 1254 1255 if (community->gpps) 1256 ngpps = community->ngpps; 1257 else 1258 ngpps = DIV_ROUND_UP(community->npins, community->gpp_size); 1259 1260 gpps = devm_kcalloc(pctrl->dev, ngpps, sizeof(*gpps), GFP_KERNEL); 1261 if (!gpps) 1262 return -ENOMEM; 1263 1264 for (i = 0; i < ngpps; i++) { 1265 if (community->gpps) { 1266 gpps[i] = community->gpps[i]; 1267 } else { 1268 unsigned int gpp_size = community->gpp_size; 1269 1270 gpps[i].reg_num = i; 1271 gpps[i].base = community->pin_base + i * gpp_size; 1272 gpps[i].size = min(gpp_size, npins); 1273 npins -= gpps[i].size; 1274 } 1275 1276 if (gpps[i].size > 32) 1277 return -EINVAL; 1278 1279 if (!gpps[i].gpio_base) 1280 gpps[i].gpio_base = gpps[i].base; 1281 1282 gpps[i].padown_num = padown_num; 1283 1284 /* 1285 * In older hardware the number of padown registers per 1286 * group is fixed regardless of the group size. 1287 */ 1288 if (community->gpp_num_padown_regs) 1289 padown_num += community->gpp_num_padown_regs; 1290 else 1291 padown_num += DIV_ROUND_UP(gpps[i].size * 4, 32); 1292 } 1293 1294 community->ngpps = ngpps; 1295 community->gpps = gpps; 1296 1297 return 0; 1298 } 1299 1300 static int intel_pinctrl_pm_init(struct intel_pinctrl *pctrl) 1301 { 1302 #ifdef CONFIG_PM_SLEEP 1303 const struct intel_pinctrl_soc_data *soc = pctrl->soc; 1304 struct intel_community_context *communities; 1305 struct intel_pad_context *pads; 1306 int i; 1307 1308 pads = devm_kcalloc(pctrl->dev, soc->npins, sizeof(*pads), GFP_KERNEL); 1309 if (!pads) 1310 return -ENOMEM; 1311 1312 communities = devm_kcalloc(pctrl->dev, pctrl->ncommunities, 1313 sizeof(*communities), GFP_KERNEL); 1314 if (!communities) 1315 return -ENOMEM; 1316 1317 1318 for (i = 0; i < pctrl->ncommunities; i++) { 1319 struct intel_community *community = &pctrl->communities[i]; 1320 u32 *intmask, *hostown; 1321 1322 intmask = devm_kcalloc(pctrl->dev, community->ngpps, 1323 sizeof(*intmask), GFP_KERNEL); 1324 if (!intmask) 1325 return -ENOMEM; 1326 1327 communities[i].intmask = intmask; 1328 1329 hostown = devm_kcalloc(pctrl->dev, community->ngpps, 1330 sizeof(*hostown), GFP_KERNEL); 1331 if (!hostown) 1332 return -ENOMEM; 1333 1334 communities[i].hostown = hostown; 1335 } 1336 1337 pctrl->context.pads = pads; 1338 pctrl->context.communities = communities; 1339 #endif 1340 1341 return 0; 1342 } 1343 1344 static int intel_pinctrl_probe(struct platform_device *pdev, 1345 const struct intel_pinctrl_soc_data *soc_data) 1346 { 1347 struct intel_pinctrl *pctrl; 1348 int i, ret, irq; 1349 1350 if (!soc_data) 1351 return -EINVAL; 1352 1353 pctrl = devm_kzalloc(&pdev->dev, sizeof(*pctrl), GFP_KERNEL); 1354 if (!pctrl) 1355 return -ENOMEM; 1356 1357 pctrl->dev = &pdev->dev; 1358 pctrl->soc = soc_data; 1359 raw_spin_lock_init(&pctrl->lock); 1360 1361 /* 1362 * Make a copy of the communities which we can use to hold pointers 1363 * to the registers. 1364 */ 1365 pctrl->ncommunities = pctrl->soc->ncommunities; 1366 pctrl->communities = devm_kcalloc(&pdev->dev, pctrl->ncommunities, 1367 sizeof(*pctrl->communities), GFP_KERNEL); 1368 if (!pctrl->communities) 1369 return -ENOMEM; 1370 1371 for (i = 0; i < pctrl->ncommunities; i++) { 1372 struct intel_community *community = &pctrl->communities[i]; 1373 void __iomem *regs; 1374 u32 padbar; 1375 1376 *community = pctrl->soc->communities[i]; 1377 1378 regs = devm_platform_ioremap_resource(pdev, community->barno); 1379 if (IS_ERR(regs)) 1380 return PTR_ERR(regs); 1381 1382 /* 1383 * Determine community features based on the revision if 1384 * not specified already. 1385 */ 1386 if (!community->features) { 1387 u32 rev; 1388 1389 rev = (readl(regs + REVID) & REVID_MASK) >> REVID_SHIFT; 1390 if (rev >= 0x94) { 1391 community->features |= PINCTRL_FEATURE_DEBOUNCE; 1392 community->features |= PINCTRL_FEATURE_1K_PD; 1393 } 1394 } 1395 1396 /* Read offset of the pad configuration registers */ 1397 padbar = readl(regs + PADBAR); 1398 1399 community->regs = regs; 1400 community->pad_regs = regs + padbar; 1401 1402 ret = intel_pinctrl_add_padgroups(pctrl, community); 1403 if (ret) 1404 return ret; 1405 } 1406 1407 irq = platform_get_irq(pdev, 0); 1408 if (irq < 0) 1409 return irq; 1410 1411 ret = intel_pinctrl_pm_init(pctrl); 1412 if (ret) 1413 return ret; 1414 1415 pctrl->pctldesc = intel_pinctrl_desc; 1416 pctrl->pctldesc.name = dev_name(&pdev->dev); 1417 pctrl->pctldesc.pins = pctrl->soc->pins; 1418 pctrl->pctldesc.npins = pctrl->soc->npins; 1419 1420 pctrl->pctldev = devm_pinctrl_register(&pdev->dev, &pctrl->pctldesc, 1421 pctrl); 1422 if (IS_ERR(pctrl->pctldev)) { 1423 dev_err(&pdev->dev, "failed to register pinctrl driver\n"); 1424 return PTR_ERR(pctrl->pctldev); 1425 } 1426 1427 ret = intel_gpio_probe(pctrl, irq); 1428 if (ret) 1429 return ret; 1430 1431 platform_set_drvdata(pdev, pctrl); 1432 1433 return 0; 1434 } 1435 1436 int intel_pinctrl_probe_by_hid(struct platform_device *pdev) 1437 { 1438 const struct intel_pinctrl_soc_data *data; 1439 1440 data = device_get_match_data(&pdev->dev); 1441 return intel_pinctrl_probe(pdev, data); 1442 } 1443 EXPORT_SYMBOL_GPL(intel_pinctrl_probe_by_hid); 1444 1445 int intel_pinctrl_probe_by_uid(struct platform_device *pdev) 1446 { 1447 const struct intel_pinctrl_soc_data *data = NULL; 1448 const struct intel_pinctrl_soc_data **table; 1449 struct acpi_device *adev; 1450 unsigned int i; 1451 1452 adev = ACPI_COMPANION(&pdev->dev); 1453 if (adev) { 1454 const void *match = device_get_match_data(&pdev->dev); 1455 1456 table = (const struct intel_pinctrl_soc_data **)match; 1457 for (i = 0; table[i]; i++) { 1458 if (!strcmp(adev->pnp.unique_id, table[i]->uid)) { 1459 data = table[i]; 1460 break; 1461 } 1462 } 1463 } else { 1464 const struct platform_device_id *id; 1465 1466 id = platform_get_device_id(pdev); 1467 if (!id) 1468 return -ENODEV; 1469 1470 table = (const struct intel_pinctrl_soc_data **)id->driver_data; 1471 data = table[pdev->id]; 1472 } 1473 1474 return intel_pinctrl_probe(pdev, data); 1475 } 1476 EXPORT_SYMBOL_GPL(intel_pinctrl_probe_by_uid); 1477 1478 #ifdef CONFIG_PM_SLEEP 1479 static bool intel_pinctrl_should_save(struct intel_pinctrl *pctrl, unsigned int pin) 1480 { 1481 const struct pin_desc *pd = pin_desc_get(pctrl->pctldev, pin); 1482 1483 if (!pd || !intel_pad_usable(pctrl, pin)) 1484 return false; 1485 1486 /* 1487 * Only restore the pin if it is actually in use by the kernel (or 1488 * by userspace). It is possible that some pins are used by the 1489 * BIOS during resume and those are not always locked down so leave 1490 * them alone. 1491 */ 1492 if (pd->mux_owner || pd->gpio_owner || 1493 gpiochip_line_is_irq(&pctrl->chip, intel_pin_to_gpio(pctrl, pin))) 1494 return true; 1495 1496 return false; 1497 } 1498 1499 int intel_pinctrl_suspend_noirq(struct device *dev) 1500 { 1501 struct intel_pinctrl *pctrl = dev_get_drvdata(dev); 1502 struct intel_community_context *communities; 1503 struct intel_pad_context *pads; 1504 int i; 1505 1506 pads = pctrl->context.pads; 1507 for (i = 0; i < pctrl->soc->npins; i++) { 1508 const struct pinctrl_pin_desc *desc = &pctrl->soc->pins[i]; 1509 void __iomem *padcfg; 1510 u32 val; 1511 1512 if (!intel_pinctrl_should_save(pctrl, desc->number)) 1513 continue; 1514 1515 val = readl(intel_get_padcfg(pctrl, desc->number, PADCFG0)); 1516 pads[i].padcfg0 = val & ~PADCFG0_GPIORXSTATE; 1517 val = readl(intel_get_padcfg(pctrl, desc->number, PADCFG1)); 1518 pads[i].padcfg1 = val; 1519 1520 padcfg = intel_get_padcfg(pctrl, desc->number, PADCFG2); 1521 if (padcfg) 1522 pads[i].padcfg2 = readl(padcfg); 1523 } 1524 1525 communities = pctrl->context.communities; 1526 for (i = 0; i < pctrl->ncommunities; i++) { 1527 struct intel_community *community = &pctrl->communities[i]; 1528 void __iomem *base; 1529 unsigned int gpp; 1530 1531 base = community->regs + community->ie_offset; 1532 for (gpp = 0; gpp < community->ngpps; gpp++) 1533 communities[i].intmask[gpp] = readl(base + gpp * 4); 1534 1535 base = community->regs + community->hostown_offset; 1536 for (gpp = 0; gpp < community->ngpps; gpp++) 1537 communities[i].hostown[gpp] = readl(base + gpp * 4); 1538 } 1539 1540 return 0; 1541 } 1542 EXPORT_SYMBOL_GPL(intel_pinctrl_suspend_noirq); 1543 1544 static void intel_gpio_irq_init(struct intel_pinctrl *pctrl) 1545 { 1546 size_t i; 1547 1548 for (i = 0; i < pctrl->ncommunities; i++) { 1549 const struct intel_community *community; 1550 void __iomem *base; 1551 unsigned int gpp; 1552 1553 community = &pctrl->communities[i]; 1554 base = community->regs; 1555 1556 for (gpp = 0; gpp < community->ngpps; gpp++) { 1557 /* Mask and clear all interrupts */ 1558 writel(0, base + community->ie_offset + gpp * 4); 1559 writel(0xffff, base + community->is_offset + gpp * 4); 1560 } 1561 } 1562 } 1563 1564 static u32 1565 intel_gpio_is_requested(struct gpio_chip *chip, int base, unsigned int size) 1566 { 1567 u32 requested = 0; 1568 unsigned int i; 1569 1570 for (i = 0; i < size; i++) 1571 if (gpiochip_is_requested(chip, base + i)) 1572 requested |= BIT(i); 1573 1574 return requested; 1575 } 1576 1577 static bool intel_gpio_update_reg(void __iomem *reg, u32 mask, u32 value) 1578 { 1579 u32 curr, updated; 1580 1581 curr = readl(reg); 1582 1583 updated = (curr & ~mask) | (value & mask); 1584 if (curr == updated) 1585 return false; 1586 1587 writel(updated, reg); 1588 return true; 1589 } 1590 1591 static void intel_restore_hostown(struct intel_pinctrl *pctrl, unsigned int c, 1592 void __iomem *base, unsigned int gpp, u32 saved) 1593 { 1594 const struct intel_community *community = &pctrl->communities[c]; 1595 const struct intel_padgroup *padgrp = &community->gpps[gpp]; 1596 struct device *dev = pctrl->dev; 1597 u32 requested; 1598 1599 if (padgrp->gpio_base < 0) 1600 return; 1601 1602 requested = intel_gpio_is_requested(&pctrl->chip, padgrp->gpio_base, padgrp->size); 1603 if (!intel_gpio_update_reg(base + gpp * 4, requested, saved)) 1604 return; 1605 1606 dev_dbg(dev, "restored hostown %u/%u %#08x\n", c, gpp, readl(base + gpp * 4)); 1607 } 1608 1609 static void intel_restore_intmask(struct intel_pinctrl *pctrl, unsigned int c, 1610 void __iomem *base, unsigned int gpp, u32 saved) 1611 { 1612 struct device *dev = pctrl->dev; 1613 1614 if (!intel_gpio_update_reg(base + gpp * 4, ~0U, saved)) 1615 return; 1616 1617 dev_dbg(dev, "restored mask %u/%u %#08x\n", c, gpp, readl(base + gpp * 4)); 1618 } 1619 1620 static void intel_restore_padcfg(struct intel_pinctrl *pctrl, unsigned int pin, 1621 unsigned int reg, u32 saved) 1622 { 1623 u32 mask = (reg == PADCFG0) ? PADCFG0_GPIORXSTATE : 0; 1624 unsigned int n = reg / sizeof(u32); 1625 struct device *dev = pctrl->dev; 1626 void __iomem *padcfg; 1627 1628 padcfg = intel_get_padcfg(pctrl, pin, reg); 1629 if (!padcfg) 1630 return; 1631 1632 if (!intel_gpio_update_reg(padcfg, ~mask, saved)) 1633 return; 1634 1635 dev_dbg(dev, "restored pin %u padcfg%u %#08x\n", pin, n, readl(padcfg)); 1636 } 1637 1638 int intel_pinctrl_resume_noirq(struct device *dev) 1639 { 1640 struct intel_pinctrl *pctrl = dev_get_drvdata(dev); 1641 const struct intel_community_context *communities; 1642 const struct intel_pad_context *pads; 1643 int i; 1644 1645 /* Mask all interrupts */ 1646 intel_gpio_irq_init(pctrl); 1647 1648 pads = pctrl->context.pads; 1649 for (i = 0; i < pctrl->soc->npins; i++) { 1650 const struct pinctrl_pin_desc *desc = &pctrl->soc->pins[i]; 1651 1652 if (!intel_pinctrl_should_save(pctrl, desc->number)) 1653 continue; 1654 1655 intel_restore_padcfg(pctrl, desc->number, PADCFG0, pads[i].padcfg0); 1656 intel_restore_padcfg(pctrl, desc->number, PADCFG1, pads[i].padcfg1); 1657 intel_restore_padcfg(pctrl, desc->number, PADCFG2, pads[i].padcfg2); 1658 } 1659 1660 communities = pctrl->context.communities; 1661 for (i = 0; i < pctrl->ncommunities; i++) { 1662 struct intel_community *community = &pctrl->communities[i]; 1663 void __iomem *base; 1664 unsigned int gpp; 1665 1666 base = community->regs + community->ie_offset; 1667 for (gpp = 0; gpp < community->ngpps; gpp++) 1668 intel_restore_intmask(pctrl, i, base, gpp, communities[i].intmask[gpp]); 1669 1670 base = community->regs + community->hostown_offset; 1671 for (gpp = 0; gpp < community->ngpps; gpp++) 1672 intel_restore_hostown(pctrl, i, base, gpp, communities[i].hostown[gpp]); 1673 } 1674 1675 return 0; 1676 } 1677 EXPORT_SYMBOL_GPL(intel_pinctrl_resume_noirq); 1678 #endif 1679 1680 MODULE_AUTHOR("Mathias Nyman <mathias.nyman@linux.intel.com>"); 1681 MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>"); 1682 MODULE_DESCRIPTION("Intel pinctrl/GPIO core driver"); 1683 MODULE_LICENSE("GPL v2"); 1684