drivers/pinctrl/intel/pinctrl-intel.c

   1 /*
   2  * Intel pinctrl/GPIO core driver.
   3  *
   4  * Copyright (C) 2015, Intel Corporation
   5  * Authors: Mathias Nyman <mathias.nyman@linux.intel.com>
   6  *          Mika Westerberg <mika.westerberg@linux.intel.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/gpio/driver.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/pinctrl/pinctrl.h>
  18 #include <linux/pinctrl/pinmux.h>
  19 #include <linux/pinctrl/pinconf.h>
  20 #include <linux/pinctrl/pinconf-generic.h>
  21
  22 #include "pinctrl-intel.h"
  23
  24 /* Offset from regs */
  25 #define PADBAR                          0x00c
  26 #define GPI_IS                          0x100
  27 #define GPI_GPE_STS                     0x140
  28 #define GPI_GPE_EN                      0x160
  29
  30 #define PADOWN_BITS                     4
  31 #define PADOWN_SHIFT(p)                 ((p) % 8 * PADOWN_BITS)
  32 #define PADOWN_MASK(p)                  (0xf << PADOWN_SHIFT(p))
  33 #define PADOWN_GPP(p)                   ((p) / 8)
  34
  35 /* Offset from pad_regs */
  36 #define PADCFG0                         0x000
  37 #define PADCFG0_RXEVCFG_SHIFT           25
  38 #define PADCFG0_RXEVCFG_MASK            (3 << PADCFG0_RXEVCFG_SHIFT)
  39 #define PADCFG0_RXEVCFG_LEVEL           0
  40 #define PADCFG0_RXEVCFG_EDGE            1
  41 #define PADCFG0_RXEVCFG_DISABLED        2
  42 #define PADCFG0_RXEVCFG_EDGE_BOTH       3
  43 #define PADCFG0_RXINV                   BIT(23)
  44 #define PADCFG0_GPIROUTIOXAPIC          BIT(20)
  45 #define PADCFG0_GPIROUTSCI              BIT(19)
  46 #define PADCFG0_GPIROUTSMI              BIT(18)
  47 #define PADCFG0_GPIROUTNMI              BIT(17)
  48 #define PADCFG0_PMODE_SHIFT             10
  49 #define PADCFG0_PMODE_MASK              (0xf << PADCFG0_PMODE_SHIFT)
  50 #define PADCFG0_GPIORXDIS               BIT(9)
  51 #define PADCFG0_GPIOTXDIS               BIT(8)
  52 #define PADCFG0_GPIORXSTATE             BIT(1)
  53 #define PADCFG0_GPIOTXSTATE             BIT(0)
  54
  55 #define PADCFG1                         0x004
  56 #define PADCFG1_TERM_UP                 BIT(13)
  57 #define PADCFG1_TERM_SHIFT              10
  58 #define PADCFG1_TERM_MASK               (7 << PADCFG1_TERM_SHIFT)
  59 #define PADCFG1_TERM_20K                4
  60 #define PADCFG1_TERM_2K                 3
  61 #define PADCFG1_TERM_5K                 2
  62 #define PADCFG1_TERM_1K                 1
  63
  64 struct intel_pad_context {
  65         u32 padcfg0;
  66         u32 padcfg1;
  67 };
  68
  69 struct intel_community_context {
  70         u32 *intmask;
  71 };
  72
  73 struct intel_pinctrl_context {
  74         struct intel_pad_context *pads;
  75         struct intel_community_context *communities;
  76 };
  77
  78 /**
  79  * struct intel_pinctrl - Intel pinctrl private structure
  80  * @dev: Pointer to the device structure
  81  * @lock: Lock to serialize register access
  82  * @pctldesc: Pin controller description
  83  * @pctldev: Pointer to the pin controller device
  84  * @chip: GPIO chip in this pin controller
  85  * @soc: SoC/PCH specific pin configuration data
  86  * @communities: All communities in this pin controller
  87  * @ncommunities: Number of communities in this pin controller
  88  * @context: Configuration saved over system sleep
  89  */
  90 struct intel_pinctrl {
  91         struct device *dev;
  92         spinlock_t lock;
  93         struct pinctrl_desc pctldesc;
  94         struct pinctrl_dev *pctldev;
  95         struct gpio_chip chip;
  96         const struct intel_pinctrl_soc_data *soc;
  97         struct intel_community *communities;
  98         size_t ncommunities;
  99         struct intel_pinctrl_context context;
 100 };
 101
 102 #define pin_to_padno(c, p)      ((p) - (c)->pin_base)
 103
 104 static struct intel_community *intel_get_community(struct intel_pinctrl *pctrl,
 105                                                    unsigned pin)
 106 {
 107         struct intel_community *community;
 108         int i;
 109
 110         for (i = 0; i < pctrl->ncommunities; i++) {
 111                 community = &pctrl->communities[i];
 112                 if (pin >= community->pin_base &&
 113                     pin < community->pin_base + community->npins)
 114                         return community;
 115         }
 116
 117         dev_warn(pctrl->dev, "failed to find community for pin %u\n", pin);
 118         return NULL;
 119 }
 120
 121 static void __iomem *intel_get_padcfg(struct intel_pinctrl *pctrl, unsigned pin,
 122                                       unsigned reg)
 123 {
 124         const struct intel_community *community;
 125         unsigned padno;
 126
 127         community = intel_get_community(pctrl, pin);
 128         if (!community)
 129                 return NULL;
 130
 131         padno = pin_to_padno(community, pin);
 132         return community->pad_regs + reg + padno * 8;
 133 }
 134
 135 static bool intel_pad_owned_by_host(struct intel_pinctrl *pctrl, unsigned pin)
 136 {
 137         const struct intel_community *community;
 138         unsigned padno, gpp, offset, group;
 139         void __iomem *padown;
 140
 141         community = intel_get_community(pctrl, pin);
 142         if (!community)
 143                 return false;
 144         if (!community->padown_offset)
 145                 return true;
 146
 147         padno = pin_to_padno(community, pin);
 148         group = padno / community->gpp_size;
 149         gpp = PADOWN_GPP(padno % community->gpp_size);
 150         offset = community->padown_offset + 0x10 * group + gpp * 4;
 151         padown = community->regs + offset;
 152
 153         return !(readl(padown) & PADOWN_MASK(padno));
 154 }
 155
 156 static bool intel_pad_acpi_mode(struct intel_pinctrl *pctrl, unsigned pin)
 157 {
 158         const struct intel_community *community;
 159         unsigned padno, gpp, offset;
 160         void __iomem *hostown;
 161
 162         community = intel_get_community(pctrl, pin);
 163         if (!community)
 164                 return true;
 165         if (!community->hostown_offset)
 166                 return false;
 167
 168         padno = pin_to_padno(community, pin);
 169         gpp = padno / community->gpp_size;
 170         offset = community->hostown_offset + gpp * 4;
 171         hostown = community->regs + offset;
 172
 173         return !(readl(hostown) & BIT(padno % community->gpp_size));
 174 }
 175
 176 static bool intel_pad_locked(struct intel_pinctrl *pctrl, unsigned pin)
 177 {
 178         struct intel_community *community;
 179         unsigned padno, gpp, offset;
 180         u32 value;
 181
 182         community = intel_get_community(pctrl, pin);
 183         if (!community)
 184                 return true;
 185         if (!community->padcfglock_offset)
 186                 return false;
 187
 188         padno = pin_to_padno(community, pin);
 189         gpp = padno / community->gpp_size;
 190
 191         /*
 192          * If PADCFGLOCK and PADCFGLOCKTX bits are both clear for this pad,
 193          * the pad is considered unlocked. Any other case means that it is
 194          * either fully or partially locked and we don't touch it.
 195          */
 196         offset = community->padcfglock_offset + gpp * 8;
 197         value = readl(community->regs + offset);
 198         if (value & BIT(pin % community->gpp_size))
 199                 return true;
 200
 201         offset = community->padcfglock_offset + 4 + gpp * 8;
 202         value = readl(community->regs + offset);
 203         if (value & BIT(pin % community->gpp_size))
 204                 return true;
 205
 206         return false;
 207 }
 208
 209 static bool intel_pad_usable(struct intel_pinctrl *pctrl, unsigned pin)
 210 {
 211         return intel_pad_owned_by_host(pctrl, pin) &&
 212                 !intel_pad_locked(pctrl, pin);
 213 }
 214
 215 static int intel_get_groups_count(struct pinctrl_dev *pctldev)
 216 {
 217         struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
 218
 219         return pctrl->soc->ngroups;
 220 }
 221
 222 static const char *intel_get_group_name(struct pinctrl_dev *pctldev,
 223                                       unsigned group)
 224 {
 225         struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
 226
 227         return pctrl->soc->groups[group].name;
 228 }
 229
 230 static int intel_get_group_pins(struct pinctrl_dev *pctldev, unsigned group,
 231                               const unsigned **pins, unsigned *npins)
 232 {
 233         struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
 234
 235         *pins = pctrl->soc->groups[group].pins;
 236         *npins = pctrl->soc->groups[group].npins;
 237         return 0;
 238 }
 239
 240 static void intel_pin_dbg_show(struct pinctrl_dev *pctldev, struct seq_file *s,
 241                                unsigned pin)
 242 {
 243         struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
 244         u32 cfg0, cfg1, mode;
 245         bool locked, acpi;
 246
 247         if (!intel_pad_owned_by_host(pctrl, pin)) {
 248                 seq_puts(s, "not available");
 249                 return;
 250         }
 251
 252         cfg0 = readl(intel_get_padcfg(pctrl, pin, PADCFG0));
 253         cfg1 = readl(intel_get_padcfg(pctrl, pin, PADCFG1));
 254
 255         mode = (cfg0 & PADCFG0_PMODE_MASK) >> PADCFG0_PMODE_SHIFT;
 256         if (!mode)
 257                 seq_puts(s, "GPIO ");
 258         else
 259                 seq_printf(s, "mode %d ", mode);
 260
 261         seq_printf(s, "0x%08x 0x%08x", cfg0, cfg1);
 262
 263         locked = intel_pad_locked(pctrl, pin);
 264         acpi = intel_pad_acpi_mode(pctrl, pin);
 265
 266         if (locked || acpi) {
 267                 seq_puts(s, " [");
 268                 if (locked) {
 269                         seq_puts(s, "LOCKED");
 270                         if (acpi)
 271                                 seq_puts(s, ", ");
 272                 }
 273                 if (acpi)
 274                         seq_puts(s, "ACPI");
 275                 seq_puts(s, "]");
 276         }
 277 }
 278
 279 static const struct pinctrl_ops intel_pinctrl_ops = {
 280         .get_groups_count = intel_get_groups_count,
 281         .get_group_name = intel_get_group_name,
 282         .get_group_pins = intel_get_group_pins,
 283         .pin_dbg_show = intel_pin_dbg_show,
 284 };
 285
 286 static int intel_get_functions_count(struct pinctrl_dev *pctldev)
 287 {
 288         struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
 289
 290         return pctrl->soc->nfunctions;
 291 }
 292
 293 static const char *intel_get_function_name(struct pinctrl_dev *pctldev,
 294                                            unsigned function)
 295 {
 296         struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
 297
 298         return pctrl->soc->functions[function].name;
 299 }
 300
 301 static int intel_get_function_groups(struct pinctrl_dev *pctldev,
 302                                      unsigned function,
 303                                      const char * const **groups,
 304                                      unsigned * const ngroups)
 305 {
 306         struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
 307
 308         *groups = pctrl->soc->functions[function].groups;
 309         *ngroups = pctrl->soc->functions[function].ngroups;
 310         return 0;
 311 }
 312
 313 static int intel_pinmux_set_mux(struct pinctrl_dev *pctldev, unsigned function,
 314                                 unsigned group)
 315 {
 316         struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
 317         const struct intel_pingroup *grp = &pctrl->soc->groups[group];
 318         unsigned long flags;
 319         int i;
 320
 321         spin_lock_irqsave(&pctrl->lock, flags);
 322
 323         /*
 324          * All pins in the groups needs to be accessible and writable
 325          * before we can enable the mux for this group.
 326          */
 327         for (i = 0; i < grp->npins; i++) {
 328                 if (!intel_pad_usable(pctrl, grp->pins[i])) {
 329                         spin_unlock_irqrestore(&pctrl->lock, flags);
 330                         return -EBUSY;
 331                 }
 332         }
 333
 334         /* Now enable the mux setting for each pin in the group */
 335         for (i = 0; i < grp->npins; i++) {
 336                 void __iomem *padcfg0;
 337                 u32 value;
 338
 339                 padcfg0 = intel_get_padcfg(pctrl, grp->pins[i], PADCFG0);
 340                 value = readl(padcfg0);
 341
 342                 value &= ~PADCFG0_PMODE_MASK;
 343                 value |= grp->mode << PADCFG0_PMODE_SHIFT;
 344
 345                 writel(value, padcfg0);
 346         }
 347
 348         spin_unlock_irqrestore(&pctrl->lock, flags);
 349
 350         return 0;
 351 }
 352
 353 static int intel_gpio_request_enable(struct pinctrl_dev *pctldev,
 354                                      struct pinctrl_gpio_range *range,
 355                                      unsigned pin)
 356 {
 357         struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
 358         void __iomem *padcfg0;
 359         unsigned long flags;
 360         u32 value;
 361
 362         spin_lock_irqsave(&pctrl->lock, flags);
 363
 364         if (!intel_pad_usable(pctrl, pin)) {
 365                 spin_unlock_irqrestore(&pctrl->lock, flags);
 366                 return -EBUSY;
 367         }
 368
 369         padcfg0 = intel_get_padcfg(pctrl, pin, PADCFG0);
 370         /* Put the pad into GPIO mode */
 371         value = readl(padcfg0) & ~PADCFG0_PMODE_MASK;
 372         /* Disable SCI/SMI/NMI generation */
 373         value &= ~(PADCFG0_GPIROUTIOXAPIC | PADCFG0_GPIROUTSCI);
 374         value &= ~(PADCFG0_GPIROUTSMI | PADCFG0_GPIROUTNMI);
 375         /* Disable TX buffer and enable RX (this will be input) */
 376         value &= ~PADCFG0_GPIORXDIS;
 377         value |= PADCFG0_GPIOTXDIS;
 378         writel(value, padcfg0);
 379
 380         spin_unlock_irqrestore(&pctrl->lock, flags);
 381
 382         return 0;
 383 }
 384
 385 static int intel_gpio_set_direction(struct pinctrl_dev *pctldev,
 386                                     struct pinctrl_gpio_range *range,
 387                                     unsigned pin, bool input)
 388 {
 389         struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
 390         void __iomem *padcfg0;
 391         unsigned long flags;
 392         u32 value;
 393
 394         spin_lock_irqsave(&pctrl->lock, flags);
 395
 396         padcfg0 = intel_get_padcfg(pctrl, pin, PADCFG0);
 397
 398         value = readl(padcfg0);
 399         if (input)
 400                 value |= PADCFG0_GPIOTXDIS;
 401         else
 402                 value &= ~PADCFG0_GPIOTXDIS;
 403         writel(value, padcfg0);
 404
 405         spin_unlock_irqrestore(&pctrl->lock, flags);
 406
 407         return 0;
 408 }
 409
 410 static const struct pinmux_ops intel_pinmux_ops = {
 411         .get_functions_count = intel_get_functions_count,
 412         .get_function_name = intel_get_function_name,
 413         .get_function_groups = intel_get_function_groups,
 414         .set_mux = intel_pinmux_set_mux,
 415         .gpio_request_enable = intel_gpio_request_enable,
 416         .gpio_set_direction = intel_gpio_set_direction,
 417 };
 418
 419 static int intel_config_get(struct pinctrl_dev *pctldev, unsigned pin,
 420                             unsigned long *config)
 421 {
 422         struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
 423         enum pin_config_param param = pinconf_to_config_param(*config);
 424         u32 value, term;
 425         u16 arg = 0;
 426
 427         if (!intel_pad_owned_by_host(pctrl, pin))
 428                 return -ENOTSUPP;
 429
 430         value = readl(intel_get_padcfg(pctrl, pin, PADCFG1));
 431         term = (value & PADCFG1_TERM_MASK) >> PADCFG1_TERM_SHIFT;
 432
 433         switch (param) {
 434         case PIN_CONFIG_BIAS_DISABLE:
 435                 if (term)
 436                         return -EINVAL;
 437                 break;
 438
 439         case PIN_CONFIG_BIAS_PULL_UP:
 440                 if (!term || !(value & PADCFG1_TERM_UP))
 441                         return -EINVAL;
 442
 443                 switch (term) {
 444                 case PADCFG1_TERM_1K:
 445                         arg = 1000;
 446                         break;
 447                 case PADCFG1_TERM_2K:
 448                         arg = 2000;
 449                         break;
 450                 case PADCFG1_TERM_5K:
 451                         arg = 5000;
 452                         break;
 453                 case PADCFG1_TERM_20K:
 454                         arg = 20000;
 455                         break;
 456                 }
 457
 458                 break;
 459
 460         case PIN_CONFIG_BIAS_PULL_DOWN:
 461                 if (!term || value & PADCFG1_TERM_UP)
 462                         return -EINVAL;
 463
 464                 switch (term) {
 465                 case PADCFG1_TERM_5K:
 466                         arg = 5000;
 467                         break;
 468                 case PADCFG1_TERM_20K:
 469                         arg = 20000;
 470                         break;
 471                 }
 472
 473                 break;
 474
 475         default:
 476                 return -ENOTSUPP;
 477         }
 478
 479         *config = pinconf_to_config_packed(param, arg);
 480         return 0;
 481 }
 482
 483 static int intel_config_set_pull(struct intel_pinctrl *pctrl, unsigned pin,
 484                                  unsigned long config)
 485 {
 486         unsigned param = pinconf_to_config_param(config);
 487         unsigned arg = pinconf_to_config_argument(config);
 488         void __iomem *padcfg1;
 489         unsigned long flags;
 490         int ret = 0;
 491         u32 value;
 492
 493         spin_lock_irqsave(&pctrl->lock, flags);
 494
 495         padcfg1 = intel_get_padcfg(pctrl, pin, PADCFG1);
 496         value = readl(padcfg1);
 497
 498         switch (param) {
 499         case PIN_CONFIG_BIAS_DISABLE:
 500                 value &= ~(PADCFG1_TERM_MASK | PADCFG1_TERM_UP);
 501                 break;
 502
 503         case PIN_CONFIG_BIAS_PULL_UP:
 504                 value &= ~PADCFG1_TERM_MASK;
 505
 506                 value |= PADCFG1_TERM_UP;
 507
 508                 switch (arg) {
 509                 case 20000:
 510                         value |= PADCFG1_TERM_20K << PADCFG1_TERM_SHIFT;
 511                         break;
 512                 case 5000:
 513                         value |= PADCFG1_TERM_5K << PADCFG1_TERM_SHIFT;
 514                         break;
 515                 case 2000:
 516                         value |= PADCFG1_TERM_2K << PADCFG1_TERM_SHIFT;
 517                         break;
 518                 case 1000:
 519                         value |= PADCFG1_TERM_1K << PADCFG1_TERM_SHIFT;
 520                         break;
 521                 default:
 522                         ret = -EINVAL;
 523                 }
 524
 525                 break;
 526
 527         case PIN_CONFIG_BIAS_PULL_DOWN:
 528                 value &= ~(PADCFG1_TERM_UP | PADCFG1_TERM_MASK);
 529
 530                 switch (arg) {
 531                 case 20000:
 532                         value |= PADCFG1_TERM_20K << PADCFG1_TERM_SHIFT;
 533                         break;
 534                 case 5000:
 535                         value |= PADCFG1_TERM_5K << PADCFG1_TERM_SHIFT;
 536                         break;
 537                 default:
 538                         ret = -EINVAL;
 539                 }
 540
 541                 break;
 542         }
 543
 544         if (!ret)
 545                 writel(value, padcfg1);
 546
 547         spin_unlock_irqrestore(&pctrl->lock, flags);
 548
 549         return ret;
 550 }
 551
 552 static int intel_config_set(struct pinctrl_dev *pctldev, unsigned pin,
 553                           unsigned long *configs, unsigned nconfigs)
 554 {
 555         struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
 556         int i, ret;
 557
 558         if (!intel_pad_usable(pctrl, pin))
 559                 return -ENOTSUPP;
 560
 561         for (i = 0; i < nconfigs; i++) {
 562                 switch (pinconf_to_config_param(configs[i])) {
 563                 case PIN_CONFIG_BIAS_DISABLE:
 564                 case PIN_CONFIG_BIAS_PULL_UP:
 565                 case PIN_CONFIG_BIAS_PULL_DOWN:
 566                         ret = intel_config_set_pull(pctrl, pin, configs[i]);
 567                         if (ret)
 568                                 return ret;
 569                         break;
 570
 571                 default:
 572                         return -ENOTSUPP;
 573                 }
 574         }
 575
 576         return 0;
 577 }
 578
 579 static const struct pinconf_ops intel_pinconf_ops = {
 580         .is_generic = true,
 581         .pin_config_get = intel_config_get,
 582         .pin_config_set = intel_config_set,
 583 };
 584
 585 static const struct pinctrl_desc intel_pinctrl_desc = {
 586         .pctlops = &intel_pinctrl_ops,
 587         .pmxops = &intel_pinmux_ops,
 588         .confops = &intel_pinconf_ops,
 589         .owner = THIS_MODULE,
 590 };
 591
 592 static int intel_gpio_get(struct gpio_chip *chip, unsigned offset)
 593 {
 594         struct intel_pinctrl *pctrl = gpiochip_get_data(chip);
 595         void __iomem *reg;
 596
 597         reg = intel_get_padcfg(pctrl, offset, PADCFG0);
 598         if (!reg)
 599                 return -EINVAL;
 600
 601         return !!(readl(reg) & PADCFG0_GPIORXSTATE);
 602 }
 603
 604 static void intel_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
 605 {
 606         struct intel_pinctrl *pctrl = gpiochip_get_data(chip);
 607         void __iomem *reg;
 608
 609         reg = intel_get_padcfg(pctrl, offset, PADCFG0);
 610         if (reg) {
 611                 unsigned long flags;
 612                 u32 padcfg0;
 613
 614                 spin_lock_irqsave(&pctrl->lock, flags);
 615                 padcfg0 = readl(reg);
 616                 if (value)
 617                         padcfg0 |= PADCFG0_GPIOTXSTATE;
 618                 else
 619                         padcfg0 &= ~PADCFG0_GPIOTXSTATE;
 620                 writel(padcfg0, reg);
 621                 spin_unlock_irqrestore(&pctrl->lock, flags);
 622         }
 623 }
 624
 625 static int intel_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
 626 {
 627         return pinctrl_gpio_direction_input(chip->base + offset);
 628 }
 629
 630 static int intel_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
 631                                        int value)
 632 {
 633         intel_gpio_set(chip, offset, value);
 634         return pinctrl_gpio_direction_output(chip->base + offset);
 635 }
 636
 637 static const struct gpio_chip intel_gpio_chip = {
 638         .owner = THIS_MODULE,
 639         .request = gpiochip_generic_request,
 640         .free = gpiochip_generic_free,
 641         .direction_input = intel_gpio_direction_input,
 642         .direction_output = intel_gpio_direction_output,
 643         .get = intel_gpio_get,
 644         .set = intel_gpio_set,
 645 };
 646
 647 static void intel_gpio_irq_ack(struct irq_data *d)
 648 {
 649         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 650         struct intel_pinctrl *pctrl = gpiochip_get_data(gc);
 651         const struct intel_community *community;
 652         unsigned pin = irqd_to_hwirq(d);
 653
 654         spin_lock(&pctrl->lock);
 655
 656         community = intel_get_community(pctrl, pin);
 657         if (community) {
 658                 unsigned padno = pin_to_padno(community, pin);
 659                 unsigned gpp_offset = padno % community->gpp_size;
 660                 unsigned gpp = padno / community->gpp_size;
 661
 662                 writel(BIT(gpp_offset), community->regs + GPI_IS + gpp * 4);
 663         }
 664
 665         spin_unlock(&pctrl->lock);
 666 }
 667
 668 static void intel_gpio_irq_mask_unmask(struct irq_data *d, bool mask)
 669 {
 670         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 671         struct intel_pinctrl *pctrl = gpiochip_get_data(gc);
 672         const struct intel_community *community;
 673         unsigned pin = irqd_to_hwirq(d);
 674         unsigned long flags;
 675
 676         spin_lock_irqsave(&pctrl->lock, flags);
 677
 678         community = intel_get_community(pctrl, pin);
 679         if (community) {
 680                 unsigned padno = pin_to_padno(community, pin);
 681                 unsigned gpp_offset = padno % community->gpp_size;
 682                 unsigned gpp = padno / community->gpp_size;
 683                 void __iomem *reg;
 684                 u32 value;
 685
 686                 reg = community->regs + community->ie_offset + gpp * 4;
 687                 value = readl(reg);
 688                 if (mask)
 689                         value &= ~BIT(gpp_offset);
 690                 else
 691                         value |= BIT(gpp_offset);
 692                 writel(value, reg);
 693         }
 694
 695         spin_unlock_irqrestore(&pctrl->lock, flags);
 696 }
 697
 698 static void intel_gpio_irq_mask(struct irq_data *d)
 699 {
 700         intel_gpio_irq_mask_unmask(d, true);
 701 }
 702
 703 static void intel_gpio_irq_unmask(struct irq_data *d)
 704 {
 705         intel_gpio_irq_mask_unmask(d, false);
 706 }
 707
 708 static int intel_gpio_irq_type(struct irq_data *d, unsigned type)
 709 {
 710         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 711         struct intel_pinctrl *pctrl = gpiochip_get_data(gc);
 712         unsigned pin = irqd_to_hwirq(d);
 713         unsigned long flags;
 714         void __iomem *reg;
 715         u32 value;
 716
 717         reg = intel_get_padcfg(pctrl, pin, PADCFG0);
 718         if (!reg)
 719                 return -EINVAL;
 720
 721         /*
 722          * If the pin is in ACPI mode it is still usable as a GPIO but it
 723          * cannot be used as IRQ because GPI_IS status bit will not be
 724          * updated by the host controller hardware.
 725          */
 726         if (intel_pad_acpi_mode(pctrl, pin)) {
 727                 dev_warn(pctrl->dev, "pin %u cannot be used as IRQ\n", pin);
 728                 return -EPERM;
 729         }
 730
 731         spin_lock_irqsave(&pctrl->lock, flags);
 732
 733         value = readl(reg);
 734
 735         value &= ~(PADCFG0_RXEVCFG_MASK | PADCFG0_RXINV);
 736
 737         if ((type & IRQ_TYPE_EDGE_BOTH) == IRQ_TYPE_EDGE_BOTH) {
 738                 value |= PADCFG0_RXEVCFG_EDGE_BOTH << PADCFG0_RXEVCFG_SHIFT;
 739         } else if (type & IRQ_TYPE_EDGE_FALLING) {
 740                 value |= PADCFG0_RXEVCFG_EDGE << PADCFG0_RXEVCFG_SHIFT;
 741                 value |= PADCFG0_RXINV;
 742         } else if (type & IRQ_TYPE_EDGE_RISING) {
 743                 value |= PADCFG0_RXEVCFG_EDGE << PADCFG0_RXEVCFG_SHIFT;
 744         } else if (type & IRQ_TYPE_LEVEL_LOW) {
 745                 value |= PADCFG0_RXINV;
 746         } else {
 747                 value |= PADCFG0_RXEVCFG_DISABLED << PADCFG0_RXEVCFG_SHIFT;
 748         }
 749
 750         writel(value, reg);
 751
 752         if (type & IRQ_TYPE_EDGE_BOTH)
 753                 irq_set_handler_locked(d, handle_edge_irq);
 754         else if (type & IRQ_TYPE_LEVEL_MASK)
 755                 irq_set_handler_locked(d, handle_level_irq);
 756
 757         spin_unlock_irqrestore(&pctrl->lock, flags);
 758
 759         return 0;
 760 }
 761
 762 static int intel_gpio_irq_wake(struct irq_data *d, unsigned int on)
 763 {
 764         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 765         struct intel_pinctrl *pctrl = gpiochip_get_data(gc);
 766         const struct intel_community *community;
 767         unsigned pin = irqd_to_hwirq(d);
 768         unsigned padno, gpp, gpp_offset;
 769         u32 gpe_en;
 770
 771         community = intel_get_community(pctrl, pin);
 772         if (!community)
 773                 return -EINVAL;
 774
 775         padno = pin_to_padno(community, pin);
 776         gpp = padno / community->gpp_size;
 777         gpp_offset = padno % community->gpp_size;
 778
 779         /* Clear the existing wake status */
 780         writel(BIT(gpp_offset), community->regs + GPI_GPE_STS + gpp * 4);
 781
 782         /*
 783          * The controller will generate wake when GPE of the corresponding
 784          * pad is enabled and it is not routed to SCI (GPIROUTSCI is not
 785          * set).
 786          */
 787         gpe_en = readl(community->regs + GPI_GPE_EN + gpp * 4);
 788         if (on)
 789                 gpe_en |= BIT(gpp_offset);
 790         else
 791                 gpe_en &= ~BIT(gpp_offset);
 792         writel(gpe_en, community->regs + GPI_GPE_EN + gpp * 4);
 793
 794         dev_dbg(pctrl->dev, "%sable wake for pin %u\n", on ? "en" : "dis", pin);
 795         return 0;
 796 }
 797
 798 static irqreturn_t intel_gpio_community_irq_handler(struct intel_pinctrl *pctrl,
 799         const struct intel_community *community)
 800 {
 801         struct gpio_chip *gc = &pctrl->chip;
 802         irqreturn_t ret = IRQ_NONE;
 803         int gpp;
 804
 805         for (gpp = 0; gpp < community->ngpps; gpp++) {
 806                 unsigned long pending, enabled, gpp_offset;
 807
 808                 pending = readl(community->regs + GPI_IS + gpp * 4);
 809                 enabled = readl(community->regs + community->ie_offset +
 810                                 gpp * 4);
 811
 812                 /* Only interrupts that are enabled */
 813                 pending &= enabled;
 814
 815                 for_each_set_bit(gpp_offset, &pending, community->gpp_size) {
 816                         unsigned padno, irq;
 817
 818                         /*
 819                          * The last group in community can have less pins
 820                          * than NPADS_IN_GPP.
 821                          */
 822                         padno = gpp_offset + gpp * community->gpp_size;
 823                         if (padno >= community->npins)
 824                                 break;
 825
 826                         irq = irq_find_mapping(gc->irqdomain,
 827                                                community->pin_base + padno);
 828                         generic_handle_irq(irq);
 829
 830                         ret |= IRQ_HANDLED;
 831                 }
 832         }
 833
 834         return ret;
 835 }
 836
 837 static irqreturn_t intel_gpio_irq(int irq, void *data)
 838 {
 839         const struct intel_community *community;
 840         struct intel_pinctrl *pctrl = data;
 841         irqreturn_t ret = IRQ_NONE;
 842         int i;
 843
 844         /* Need to check all communities for pending interrupts */
 845         for (i = 0; i < pctrl->ncommunities; i++) {
 846                 community = &pctrl->communities[i];
 847                 ret |= intel_gpio_community_irq_handler(pctrl, community);
 848         }
 849
 850         return ret;
 851 }
 852
 853 static struct irq_chip intel_gpio_irqchip = {
 854         .name = "intel-gpio",
 855         .irq_ack = intel_gpio_irq_ack,
 856         .irq_mask = intel_gpio_irq_mask,
 857         .irq_unmask = intel_gpio_irq_unmask,
 858         .irq_set_type = intel_gpio_irq_type,
 859         .irq_set_wake = intel_gpio_irq_wake,
 860 };
 861
 862 static int intel_gpio_probe(struct intel_pinctrl *pctrl, int irq)
 863 {
 864         int ret;
 865
 866         pctrl->chip = intel_gpio_chip;
 867
 868         pctrl->chip.ngpio = pctrl->soc->npins;
 869         pctrl->chip.label = dev_name(pctrl->dev);
 870         pctrl->chip.parent = pctrl->dev;
 871         pctrl->chip.base = -1;
 872
 873         ret = gpiochip_add_data(&pctrl->chip, pctrl);
 874         if (ret) {
 875                 dev_err(pctrl->dev, "failed to register gpiochip\n");
 876                 return ret;
 877         }
 878
 879         ret = gpiochip_add_pin_range(&pctrl->chip, dev_name(pctrl->dev),
 880                                      0, 0, pctrl->soc->npins);
 881         if (ret) {
 882                 dev_err(pctrl->dev, "failed to add GPIO pin range\n");
 883                 goto fail;
 884         }
 885
 886         /*
 887          * We need to request the interrupt here (instead of providing chip
 888          * to the irq directly) because on some platforms several GPIO
 889          * controllers share the same interrupt line.
 890          */
 891         ret = devm_request_irq(pctrl->dev, irq, intel_gpio_irq, IRQF_SHARED,
 892                                dev_name(pctrl->dev), pctrl);
 893         if (ret) {
 894                 dev_err(pctrl->dev, "failed to request interrupt\n");
 895                 goto fail;
 896         }
 897
 898         ret = gpiochip_irqchip_add(&pctrl->chip, &intel_gpio_irqchip, 0,
 899                                    handle_simple_irq, IRQ_TYPE_NONE);
 900         if (ret) {
 901                 dev_err(pctrl->dev, "failed to add irqchip\n");
 902                 goto fail;
 903         }
 904
 905         gpiochip_set_chained_irqchip(&pctrl->chip, &intel_gpio_irqchip, irq,
 906                                      NULL);
 907         return 0;
 908
 909 fail:
 910         gpiochip_remove(&pctrl->chip);
 911
 912         return ret;
 913 }
 914
 915 static int intel_pinctrl_pm_init(struct intel_pinctrl *pctrl)
 916 {
 917 #ifdef CONFIG_PM_SLEEP
 918         const struct intel_pinctrl_soc_data *soc = pctrl->soc;
 919         struct intel_community_context *communities;
 920         struct intel_pad_context *pads;
 921         int i;
 922
 923         pads = devm_kcalloc(pctrl->dev, soc->npins, sizeof(*pads), GFP_KERNEL);
 924         if (!pads)
 925                 return -ENOMEM;
 926
 927         communities = devm_kcalloc(pctrl->dev, pctrl->ncommunities,
 928                                    sizeof(*communities), GFP_KERNEL);
 929         if (!communities)
 930                 return -ENOMEM;
 931
 932
 933         for (i = 0; i < pctrl->ncommunities; i++) {
 934                 struct intel_community *community = &pctrl->communities[i];
 935                 u32 *intmask;
 936
 937                 intmask = devm_kcalloc(pctrl->dev, community->ngpps,
 938                                        sizeof(*intmask), GFP_KERNEL);
 939                 if (!intmask)
 940                         return -ENOMEM;
 941
 942                 communities[i].intmask = intmask;
 943         }
 944
 945         pctrl->context.pads = pads;
 946         pctrl->context.communities = communities;
 947 #endif
 948
 949         return 0;
 950 }
 951
 952 int intel_pinctrl_probe(struct platform_device *pdev,
 953                         const struct intel_pinctrl_soc_data *soc_data)
 954 {
 955         struct intel_pinctrl *pctrl;
 956         int i, ret, irq;
 957
 958         if (!soc_data)
 959                 return -EINVAL;
 960
 961         pctrl = devm_kzalloc(&pdev->dev, sizeof(*pctrl), GFP_KERNEL);
 962         if (!pctrl)
 963                 return -ENOMEM;
 964
 965         pctrl->dev = &pdev->dev;
 966         pctrl->soc = soc_data;
 967         spin_lock_init(&pctrl->lock);
 968
 969         /*
 970          * Make a copy of the communities which we can use to hold pointers
 971          * to the registers.
 972          */
 973         pctrl->ncommunities = pctrl->soc->ncommunities;
 974         pctrl->communities = devm_kcalloc(&pdev->dev, pctrl->ncommunities,
 975                                   sizeof(*pctrl->communities), GFP_KERNEL);
 976         if (!pctrl->communities)
 977                 return -ENOMEM;
 978
 979         for (i = 0; i < pctrl->ncommunities; i++) {
 980                 struct intel_community *community = &pctrl->communities[i];
 981                 struct resource *res;
 982                 void __iomem *regs;
 983                 u32 padbar;
 984
 985                 *community = pctrl->soc->communities[i];
 986
 987                 res = platform_get_resource(pdev, IORESOURCE_MEM,
 988                                             community->barno);
 989                 regs = devm_ioremap_resource(&pdev->dev, res);
 990                 if (IS_ERR(regs))
 991                         return PTR_ERR(regs);
 992
 993                 /* Read offset of the pad configuration registers */
 994                 padbar = readl(regs + PADBAR);
 995
 996                 community->regs = regs;
 997                 community->pad_regs = regs + padbar;
 998                 community->ngpps = DIV_ROUND_UP(community->npins,
 999                                                 community->gpp_size);
1000         }
1001
1002         irq = platform_get_irq(pdev, 0);
1003         if (irq < 0) {
1004                 dev_err(&pdev->dev, "failed to get interrupt number\n");
1005                 return irq;
1006         }
1007
1008         ret = intel_pinctrl_pm_init(pctrl);
1009         if (ret)
1010                 return ret;
1011
1012         pctrl->pctldesc = intel_pinctrl_desc;
1013         pctrl->pctldesc.name = dev_name(&pdev->dev);
1014         pctrl->pctldesc.pins = pctrl->soc->pins;
1015         pctrl->pctldesc.npins = pctrl->soc->npins;
1016
1017         pctrl->pctldev = pinctrl_register(&pctrl->pctldesc, &pdev->dev, pctrl);
1018         if (IS_ERR(pctrl->pctldev)) {
1019                 dev_err(&pdev->dev, "failed to register pinctrl driver\n");
1020                 return PTR_ERR(pctrl->pctldev);
1021         }
1022
1023         ret = intel_gpio_probe(pctrl, irq);
1024         if (ret) {
1025                 pinctrl_unregister(pctrl->pctldev);
1026                 return ret;
1027         }
1028
1029         platform_set_drvdata(pdev, pctrl);
1030
1031         return 0;
1032 }
1033 EXPORT_SYMBOL_GPL(intel_pinctrl_probe);
1034
1035 int intel_pinctrl_remove(struct platform_device *pdev)
1036 {
1037         struct intel_pinctrl *pctrl = platform_get_drvdata(pdev);
1038
1039         gpiochip_remove(&pctrl->chip);
1040         pinctrl_unregister(pctrl->pctldev);
1041
1042         return 0;
1043 }
1044 EXPORT_SYMBOL_GPL(intel_pinctrl_remove);
1045
1046 #ifdef CONFIG_PM_SLEEP
1047 int intel_pinctrl_suspend(struct device *dev)
1048 {
1049         struct platform_device *pdev = to_platform_device(dev);
1050         struct intel_pinctrl *pctrl = platform_get_drvdata(pdev);
1051         struct intel_community_context *communities;
1052         struct intel_pad_context *pads;
1053         int i;
1054
1055         pads = pctrl->context.pads;
1056         for (i = 0; i < pctrl->soc->npins; i++) {
1057                 const struct pinctrl_pin_desc *desc = &pctrl->soc->pins[i];
1058                 u32 val;
1059
1060                 if (!intel_pad_usable(pctrl, desc->number))
1061                         continue;
1062
1063                 val = readl(intel_get_padcfg(pctrl, desc->number, PADCFG0));
1064                 pads[i].padcfg0 = val & ~PADCFG0_GPIORXSTATE;
1065                 val = readl(intel_get_padcfg(pctrl, desc->number, PADCFG1));
1066                 pads[i].padcfg1 = val;
1067         }
1068
1069         communities = pctrl->context.communities;
1070         for (i = 0; i < pctrl->ncommunities; i++) {
1071                 struct intel_community *community = &pctrl->communities[i];
1072                 void __iomem *base;
1073                 unsigned gpp;
1074
1075                 base = community->regs + community->ie_offset;
1076                 for (gpp = 0; gpp < community->ngpps; gpp++)
1077                         communities[i].intmask[gpp] = readl(base + gpp * 4);
1078         }
1079
1080         return 0;
1081 }
1082 EXPORT_SYMBOL_GPL(intel_pinctrl_suspend);
1083
1084 static void intel_gpio_irq_init(struct intel_pinctrl *pctrl)
1085 {
1086         size_t i;
1087
1088         for (i = 0; i < pctrl->ncommunities; i++) {
1089                 const struct intel_community *community;
1090                 void __iomem *base;
1091                 unsigned gpp;
1092
1093                 community = &pctrl->communities[i];
1094                 base = community->regs;
1095
1096                 for (gpp = 0; gpp < community->ngpps; gpp++) {
1097                         /* Mask and clear all interrupts */
1098                         writel(0, base + community->ie_offset + gpp * 4);
1099                         writel(0xffff, base + GPI_IS + gpp * 4);
1100                 }
1101         }
1102 }
1103
1104 int intel_pinctrl_resume(struct device *dev)
1105 {
1106         struct platform_device *pdev = to_platform_device(dev);
1107         struct intel_pinctrl *pctrl = platform_get_drvdata(pdev);
1108         const struct intel_community_context *communities;
1109         const struct intel_pad_context *pads;
1110         int i;
1111
1112         /* Mask all interrupts */
1113         intel_gpio_irq_init(pctrl);
1114
1115         pads = pctrl->context.pads;
1116         for (i = 0; i < pctrl->soc->npins; i++) {
1117                 const struct pinctrl_pin_desc *desc = &pctrl->soc->pins[i];
1118                 void __iomem *padcfg;
1119                 u32 val;
1120
1121                 if (!intel_pad_usable(pctrl, desc->number))
1122                         continue;
1123
1124                 padcfg = intel_get_padcfg(pctrl, desc->number, PADCFG0);
1125                 val = readl(padcfg) & ~PADCFG0_GPIORXSTATE;
1126                 if (val != pads[i].padcfg0) {
1127                         writel(pads[i].padcfg0, padcfg);
1128                         dev_dbg(dev, "restored pin %u padcfg0 %#08x\n",
1129                                 desc->number, readl(padcfg));
1130                 }
1131
1132                 padcfg = intel_get_padcfg(pctrl, desc->number, PADCFG1);
1133                 val = readl(padcfg);
1134                 if (val != pads[i].padcfg1) {
1135                         writel(pads[i].padcfg1, padcfg);
1136                         dev_dbg(dev, "restored pin %u padcfg1 %#08x\n",
1137                                 desc->number, readl(padcfg));
1138                 }
1139         }
1140
1141         communities = pctrl->context.communities;
1142         for (i = 0; i < pctrl->ncommunities; i++) {
1143                 struct intel_community *community = &pctrl->communities[i];
1144                 void __iomem *base;
1145                 unsigned gpp;
1146
1147                 base = community->regs + community->ie_offset;
1148                 for (gpp = 0; gpp < community->ngpps; gpp++) {
1149                         writel(communities[i].intmask[gpp], base + gpp * 4);
1150                         dev_dbg(dev, "restored mask %d/%u %#08x\n", i, gpp,
1151                                 readl(base + gpp * 4));
1152                 }
1153         }
1154
1155         return 0;
1156 }
1157 EXPORT_SYMBOL_GPL(intel_pinctrl_resume);
1158 #endif
1159
1160 MODULE_AUTHOR("Mathias Nyman <mathias.nyman@linux.intel.com>");
1161 MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>");
1162 MODULE_DESCRIPTION("Intel pinctrl/GPIO core driver");
1163 MODULE_LICENSE("GPL v2");