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 "../core.h"
  23 #include "pinctrl-intel.h"
  24
  25 /* Offset from regs */
  26 #define PADBAR                          0x00c
  27 #define GPI_IS                          0x100
  28 #define GPI_GPE_STS                     0x140
  29 #define GPI_GPE_EN                      0x160
  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_RXINV                   BIT(23)
  45 #define PADCFG0_GPIROUTIOXAPIC          BIT(20)
  46 #define PADCFG0_GPIROUTSCI              BIT(19)
  47 #define PADCFG0_GPIROUTSMI              BIT(18)
  48 #define PADCFG0_GPIROUTNMI              BIT(17)
  49 #define PADCFG0_PMODE_SHIFT             10
  50 #define PADCFG0_PMODE_MASK              (0xf << PADCFG0_PMODE_SHIFT)
  51 #define PADCFG0_GPIORXDIS               BIT(9)
  52 #define PADCFG0_GPIOTXDIS               BIT(8)
  53 #define PADCFG0_GPIORXSTATE             BIT(1)
  54 #define PADCFG0_GPIOTXSTATE             BIT(0)
  55
  56 #define PADCFG1                         0x004
  57 #define PADCFG1_TERM_UP                 BIT(13)
  58 #define PADCFG1_TERM_SHIFT              10
  59 #define PADCFG1_TERM_MASK               (7 << PADCFG1_TERM_SHIFT)
  60 #define PADCFG1_TERM_20K                4
  61 #define PADCFG1_TERM_2K                 3
  62 #define PADCFG1_TERM_5K                 2
  63 #define PADCFG1_TERM_1K                 1
  64
  65 struct intel_pad_context {
  66         u32 padcfg0;
  67         u32 padcfg1;
  68 };
  69
  70 struct intel_community_context {
  71         u32 *intmask;
  72 };
  73
  74 struct intel_pinctrl_context {
  75         struct intel_pad_context *pads;
  76         struct intel_community_context *communities;
  77 };
  78
  79 /**
  80  * struct intel_pinctrl - Intel pinctrl private structure
  81  * @dev: Pointer to the device structure
  82  * @lock: Lock to serialize register access
  83  * @pctldesc: Pin controller description
  84  * @pctldev: Pointer to the pin controller device
  85  * @chip: GPIO chip in this pin controller
  86  * @soc: SoC/PCH specific pin configuration data
  87  * @communities: All communities in this pin controller
  88  * @ncommunities: Number of communities in this pin controller
  89  * @context: Configuration saved over system sleep
  90  * @irq: pinctrl/GPIO chip irq number
  91  */
  92 struct intel_pinctrl {
  93         struct device *dev;
  94         raw_spinlock_t lock;
  95         struct pinctrl_desc pctldesc;
  96         struct pinctrl_dev *pctldev;
  97         struct gpio_chip chip;
  98         const struct intel_pinctrl_soc_data *soc;
  99         struct intel_community *communities;
 100         size_t ncommunities;
 101         struct intel_pinctrl_context context;
 102         int irq;
 103 };
 104
 105 #define pin_to_padno(c, p)      ((p) - (c)->pin_base)
 106
 107 static struct intel_community *intel_get_community(struct intel_pinctrl *pctrl,
 108                                                    unsigned pin)
 109 {
 110         struct intel_community *community;
 111         int i;
 112
 113         for (i = 0; i < pctrl->ncommunities; i++) {
 114                 community = &pctrl->communities[i];
 115                 if (pin >= community->pin_base &&
 116                     pin < community->pin_base + community->npins)
 117                         return community;
 118         }
 119
 120         dev_warn(pctrl->dev, "failed to find community for pin %u\n", pin);
 121         return NULL;
 122 }
 123
 124 static void __iomem *intel_get_padcfg(struct intel_pinctrl *pctrl, unsigned pin,
 125                                       unsigned reg)
 126 {
 127         const struct intel_community *community;
 128         unsigned padno;
 129
 130         community = intel_get_community(pctrl, pin);
 131         if (!community)
 132                 return NULL;
 133
 134         padno = pin_to_padno(community, pin);
 135         return community->pad_regs + reg + padno * 8;
 136 }
 137
 138 static bool intel_pad_owned_by_host(struct intel_pinctrl *pctrl, unsigned pin)
 139 {
 140         const struct intel_community *community;
 141         unsigned padno, gpp, offset, group;
 142         void __iomem *padown;
 143
 144         community = intel_get_community(pctrl, pin);
 145         if (!community)
 146                 return false;
 147         if (!community->padown_offset)
 148                 return true;
 149
 150         padno = pin_to_padno(community, pin);
 151         group = padno / community->gpp_size;
 152         gpp = PADOWN_GPP(padno % community->gpp_size);
 153         offset = community->padown_offset + 0x10 * group + gpp * 4;
 154         padown = community->regs + offset;
 155
 156         return !(readl(padown) & PADOWN_MASK(padno));
 157 }
 158
 159 static bool intel_pad_acpi_mode(struct intel_pinctrl *pctrl, unsigned pin)
 160 {
 161         const struct intel_community *community;
 162         unsigned padno, gpp, offset;
 163         void __iomem *hostown;
 164
 165         community = intel_get_community(pctrl, pin);
 166         if (!community)
 167                 return true;
 168         if (!community->hostown_offset)
 169                 return false;
 170
 171         padno = pin_to_padno(community, pin);
 172         gpp = padno / community->gpp_size;
 173         offset = community->hostown_offset + gpp * 4;
 174         hostown = community->regs + offset;
 175
 176         return !(readl(hostown) & BIT(padno % community->gpp_size));
 177 }
 178
 179 static bool intel_pad_locked(struct intel_pinctrl *pctrl, unsigned pin)
 180 {
 181         struct intel_community *community;
 182         unsigned padno, gpp, offset;
 183         u32 value;
 184
 185         community = intel_get_community(pctrl, pin);
 186         if (!community)
 187                 return true;
 188         if (!community->padcfglock_offset)
 189                 return false;
 190
 191         padno = pin_to_padno(community, pin);
 192         gpp = padno / community->gpp_size;
 193
 194         /*
 195          * If PADCFGLOCK and PADCFGLOCKTX bits are both clear for this pad,
 196          * the pad is considered unlocked. Any other case means that it is
 197          * either fully or partially locked and we don't touch it.
 198          */
 199         offset = community->padcfglock_offset + gpp * 8;
 200         value = readl(community->regs + offset);
 201         if (value & BIT(pin % community->gpp_size))
 202                 return true;
 203
 204         offset = community->padcfglock_offset + 4 + gpp * 8;
 205         value = readl(community->regs + offset);
 206         if (value & BIT(pin % community->gpp_size))
 207                 return true;
 208
 209         return false;
 210 }
 211
 212 static bool intel_pad_usable(struct intel_pinctrl *pctrl, unsigned pin)
 213 {
 214         return intel_pad_owned_by_host(pctrl, pin) &&
 215                 !intel_pad_locked(pctrl, pin);
 216 }
 217
 218 static int intel_get_groups_count(struct pinctrl_dev *pctldev)
 219 {
 220         struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
 221
 222         return pctrl->soc->ngroups;
 223 }
 224
 225 static const char *intel_get_group_name(struct pinctrl_dev *pctldev,
 226                                       unsigned group)
 227 {
 228         struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
 229
 230         return pctrl->soc->groups[group].name;
 231 }
 232
 233 static int intel_get_group_pins(struct pinctrl_dev *pctldev, unsigned group,
 234                               const unsigned **pins, unsigned *npins)
 235 {
 236         struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
 237
 238         *pins = pctrl->soc->groups[group].pins;
 239         *npins = pctrl->soc->groups[group].npins;
 240         return 0;
 241 }
 242
 243 static void intel_pin_dbg_show(struct pinctrl_dev *pctldev, struct seq_file *s,
 244                                unsigned pin)
 245 {
 246         struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
 247         u32 cfg0, cfg1, mode;
 248         bool locked, acpi;
 249
 250         if (!intel_pad_owned_by_host(pctrl, pin)) {
 251                 seq_puts(s, "not available");
 252                 return;
 253         }
 254
 255         cfg0 = readl(intel_get_padcfg(pctrl, pin, PADCFG0));
 256         cfg1 = readl(intel_get_padcfg(pctrl, pin, PADCFG1));
 257
 258         mode = (cfg0 & PADCFG0_PMODE_MASK) >> PADCFG0_PMODE_SHIFT;
 259         if (!mode)
 260                 seq_puts(s, "GPIO ");
 261         else
 262                 seq_printf(s, "mode %d ", mode);
 263
 264         seq_printf(s, "0x%08x 0x%08x", cfg0, cfg1);
 265
 266         locked = intel_pad_locked(pctrl, pin);
 267         acpi = intel_pad_acpi_mode(pctrl, pin);
 268
 269         if (locked || acpi) {
 270                 seq_puts(s, " [");
 271                 if (locked) {
 272                         seq_puts(s, "LOCKED");
 273                         if (acpi)
 274                                 seq_puts(s, ", ");
 275                 }
 276                 if (acpi)
 277                         seq_puts(s, "ACPI");
 278                 seq_puts(s, "]");
 279         }
 280 }
 281
 282 static const struct pinctrl_ops intel_pinctrl_ops = {
 283         .get_groups_count = intel_get_groups_count,
 284         .get_group_name = intel_get_group_name,
 285         .get_group_pins = intel_get_group_pins,
 286         .pin_dbg_show = intel_pin_dbg_show,
 287 };
 288
 289 static int intel_get_functions_count(struct pinctrl_dev *pctldev)
 290 {
 291         struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
 292
 293         return pctrl->soc->nfunctions;
 294 }
 295
 296 static const char *intel_get_function_name(struct pinctrl_dev *pctldev,
 297                                            unsigned function)
 298 {
 299         struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
 300
 301         return pctrl->soc->functions[function].name;
 302 }
 303
 304 static int intel_get_function_groups(struct pinctrl_dev *pctldev,
 305                                      unsigned function,
 306                                      const char * const **groups,
 307                                      unsigned * const ngroups)
 308 {
 309         struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
 310
 311         *groups = pctrl->soc->functions[function].groups;
 312         *ngroups = pctrl->soc->functions[function].ngroups;
 313         return 0;
 314 }
 315
 316 static int intel_pinmux_set_mux(struct pinctrl_dev *pctldev, unsigned function,
 317                                 unsigned group)
 318 {
 319         struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
 320         const struct intel_pingroup *grp = &pctrl->soc->groups[group];
 321         unsigned long flags;
 322         int i;
 323
 324         raw_spin_lock_irqsave(&pctrl->lock, flags);
 325
 326         /*
 327          * All pins in the groups needs to be accessible and writable
 328          * before we can enable the mux for this group.
 329          */
 330         for (i = 0; i < grp->npins; i++) {
 331                 if (!intel_pad_usable(pctrl, grp->pins[i])) {
 332                         raw_spin_unlock_irqrestore(&pctrl->lock, flags);
 333                         return -EBUSY;
 334                 }
 335         }
 336
 337         /* Now enable the mux setting for each pin in the group */
 338         for (i = 0; i < grp->npins; i++) {
 339                 void __iomem *padcfg0;
 340                 u32 value;
 341
 342                 padcfg0 = intel_get_padcfg(pctrl, grp->pins[i], PADCFG0);
 343                 value = readl(padcfg0);
 344
 345                 value &= ~PADCFG0_PMODE_MASK;
 346                 value |= grp->mode << PADCFG0_PMODE_SHIFT;
 347
 348                 writel(value, padcfg0);
 349         }
 350
 351         raw_spin_unlock_irqrestore(&pctrl->lock, flags);
 352
 353         return 0;
 354 }
 355
 356 static int intel_gpio_request_enable(struct pinctrl_dev *pctldev,
 357                                      struct pinctrl_gpio_range *range,
 358                                      unsigned pin)
 359 {
 360         struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
 361         void __iomem *padcfg0;
 362         unsigned long flags;
 363         u32 value;
 364
 365         raw_spin_lock_irqsave(&pctrl->lock, flags);
 366
 367         if (!intel_pad_usable(pctrl, pin)) {
 368                 raw_spin_unlock_irqrestore(&pctrl->lock, flags);
 369                 return -EBUSY;
 370         }
 371
 372         padcfg0 = intel_get_padcfg(pctrl, pin, PADCFG0);
 373         /* Put the pad into GPIO mode */
 374         value = readl(padcfg0) & ~PADCFG0_PMODE_MASK;
 375         /* Disable SCI/SMI/NMI generation */
 376         value &= ~(PADCFG0_GPIROUTIOXAPIC | PADCFG0_GPIROUTSCI);
 377         value &= ~(PADCFG0_GPIROUTSMI | PADCFG0_GPIROUTNMI);
 378         /* Disable TX buffer and enable RX (this will be input) */
 379         value &= ~PADCFG0_GPIORXDIS;
 380         value |= PADCFG0_GPIOTXDIS;
 381         writel(value, padcfg0);
 382
 383         raw_spin_unlock_irqrestore(&pctrl->lock, flags);
 384
 385         return 0;
 386 }
 387
 388 static int intel_gpio_set_direction(struct pinctrl_dev *pctldev,
 389                                     struct pinctrl_gpio_range *range,
 390                                     unsigned pin, bool input)
 391 {
 392         struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
 393         void __iomem *padcfg0;
 394         unsigned long flags;
 395         u32 value;
 396
 397         raw_spin_lock_irqsave(&pctrl->lock, flags);
 398
 399         padcfg0 = intel_get_padcfg(pctrl, pin, PADCFG0);
 400
 401         value = readl(padcfg0);
 402         if (input)
 403                 value |= PADCFG0_GPIOTXDIS;
 404         else
 405                 value &= ~PADCFG0_GPIOTXDIS;
 406         writel(value, padcfg0);
 407
 408         raw_spin_unlock_irqrestore(&pctrl->lock, flags);
 409
 410         return 0;
 411 }
 412
 413 static const struct pinmux_ops intel_pinmux_ops = {
 414         .get_functions_count = intel_get_functions_count,
 415         .get_function_name = intel_get_function_name,
 416         .get_function_groups = intel_get_function_groups,
 417         .set_mux = intel_pinmux_set_mux,
 418         .gpio_request_enable = intel_gpio_request_enable,
 419         .gpio_set_direction = intel_gpio_set_direction,
 420 };
 421
 422 static int intel_config_get(struct pinctrl_dev *pctldev, unsigned pin,
 423                             unsigned long *config)
 424 {
 425         struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
 426         enum pin_config_param param = pinconf_to_config_param(*config);
 427         u32 value, term;
 428         u16 arg = 0;
 429
 430         if (!intel_pad_owned_by_host(pctrl, pin))
 431                 return -ENOTSUPP;
 432
 433         value = readl(intel_get_padcfg(pctrl, pin, PADCFG1));
 434         term = (value & PADCFG1_TERM_MASK) >> PADCFG1_TERM_SHIFT;
 435
 436         switch (param) {
 437         case PIN_CONFIG_BIAS_DISABLE:
 438                 if (term)
 439                         return -EINVAL;
 440                 break;
 441
 442         case PIN_CONFIG_BIAS_PULL_UP:
 443                 if (!term || !(value & PADCFG1_TERM_UP))
 444                         return -EINVAL;
 445
 446                 switch (term) {
 447                 case PADCFG1_TERM_1K:
 448                         arg = 1000;
 449                         break;
 450                 case PADCFG1_TERM_2K:
 451                         arg = 2000;
 452                         break;
 453                 case PADCFG1_TERM_5K:
 454                         arg = 5000;
 455                         break;
 456                 case PADCFG1_TERM_20K:
 457                         arg = 20000;
 458                         break;
 459                 }
 460
 461                 break;
 462
 463         case PIN_CONFIG_BIAS_PULL_DOWN:
 464                 if (!term || value & PADCFG1_TERM_UP)
 465                         return -EINVAL;
 466
 467                 switch (term) {
 468                 case PADCFG1_TERM_5K:
 469                         arg = 5000;
 470                         break;
 471                 case PADCFG1_TERM_20K:
 472                         arg = 20000;
 473                         break;
 474                 }
 475
 476                 break;
 477
 478         default:
 479                 return -ENOTSUPP;
 480         }
 481
 482         *config = pinconf_to_config_packed(param, arg);
 483         return 0;
 484 }
 485
 486 static int intel_config_set_pull(struct intel_pinctrl *pctrl, unsigned pin,
 487                                  unsigned long config)
 488 {
 489         unsigned param = pinconf_to_config_param(config);
 490         unsigned arg = pinconf_to_config_argument(config);
 491         void __iomem *padcfg1;
 492         unsigned long flags;
 493         int ret = 0;
 494         u32 value;
 495
 496         raw_spin_lock_irqsave(&pctrl->lock, flags);
 497
 498         padcfg1 = intel_get_padcfg(pctrl, pin, PADCFG1);
 499         value = readl(padcfg1);
 500
 501         switch (param) {
 502         case PIN_CONFIG_BIAS_DISABLE:
 503                 value &= ~(PADCFG1_TERM_MASK | PADCFG1_TERM_UP);
 504                 break;
 505
 506         case PIN_CONFIG_BIAS_PULL_UP:
 507                 value &= ~PADCFG1_TERM_MASK;
 508
 509                 value |= PADCFG1_TERM_UP;
 510
 511                 switch (arg) {
 512                 case 20000:
 513                         value |= PADCFG1_TERM_20K << PADCFG1_TERM_SHIFT;
 514                         break;
 515                 case 5000:
 516                         value |= PADCFG1_TERM_5K << PADCFG1_TERM_SHIFT;
 517                         break;
 518                 case 2000:
 519                         value |= PADCFG1_TERM_2K << PADCFG1_TERM_SHIFT;
 520                         break;
 521                 case 1000:
 522                         value |= PADCFG1_TERM_1K << PADCFG1_TERM_SHIFT;
 523                         break;
 524                 default:
 525                         ret = -EINVAL;
 526                 }
 527
 528                 break;
 529
 530         case PIN_CONFIG_BIAS_PULL_DOWN:
 531                 value &= ~(PADCFG1_TERM_UP | PADCFG1_TERM_MASK);
 532
 533                 switch (arg) {
 534                 case 20000:
 535                         value |= PADCFG1_TERM_20K << PADCFG1_TERM_SHIFT;
 536                         break;
 537                 case 5000:
 538                         value |= PADCFG1_TERM_5K << PADCFG1_TERM_SHIFT;
 539                         break;
 540                 default:
 541                         ret = -EINVAL;
 542                 }
 543
 544                 break;
 545         }
 546
 547         if (!ret)
 548                 writel(value, padcfg1);
 549
 550         raw_spin_unlock_irqrestore(&pctrl->lock, flags);
 551
 552         return ret;
 553 }
 554
 555 static int intel_config_set(struct pinctrl_dev *pctldev, unsigned pin,
 556                           unsigned long *configs, unsigned nconfigs)
 557 {
 558         struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
 559         int i, ret;
 560
 561         if (!intel_pad_usable(pctrl, pin))
 562                 return -ENOTSUPP;
 563
 564         for (i = 0; i < nconfigs; i++) {
 565                 switch (pinconf_to_config_param(configs[i])) {
 566                 case PIN_CONFIG_BIAS_DISABLE:
 567                 case PIN_CONFIG_BIAS_PULL_UP:
 568                 case PIN_CONFIG_BIAS_PULL_DOWN:
 569                         ret = intel_config_set_pull(pctrl, pin, configs[i]);
 570                         if (ret)
 571                                 return ret;
 572                         break;
 573
 574                 default:
 575                         return -ENOTSUPP;
 576                 }
 577         }
 578
 579         return 0;
 580 }
 581
 582 static const struct pinconf_ops intel_pinconf_ops = {
 583         .is_generic = true,
 584         .pin_config_get = intel_config_get,
 585         .pin_config_set = intel_config_set,
 586 };
 587
 588 static const struct pinctrl_desc intel_pinctrl_desc = {
 589         .pctlops = &intel_pinctrl_ops,
 590         .pmxops = &intel_pinmux_ops,
 591         .confops = &intel_pinconf_ops,
 592         .owner = THIS_MODULE,
 593 };
 594
 595 static int intel_gpio_get(struct gpio_chip *chip, unsigned offset)
 596 {
 597         struct intel_pinctrl *pctrl = gpiochip_get_data(chip);
 598         void __iomem *reg;
 599
 600         reg = intel_get_padcfg(pctrl, offset, PADCFG0);
 601         if (!reg)
 602                 return -EINVAL;
 603
 604         return !!(readl(reg) & PADCFG0_GPIORXSTATE);
 605 }
 606
 607 static void intel_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
 608 {
 609         struct intel_pinctrl *pctrl = gpiochip_get_data(chip);
 610         void __iomem *reg;
 611
 612         reg = intel_get_padcfg(pctrl, offset, PADCFG0);
 613         if (reg) {
 614                 unsigned long flags;
 615                 u32 padcfg0;
 616
 617                 raw_spin_lock_irqsave(&pctrl->lock, flags);
 618                 padcfg0 = readl(reg);
 619                 if (value)
 620                         padcfg0 |= PADCFG0_GPIOTXSTATE;
 621                 else
 622                         padcfg0 &= ~PADCFG0_GPIOTXSTATE;
 623                 writel(padcfg0, reg);
 624                 raw_spin_unlock_irqrestore(&pctrl->lock, flags);
 625         }
 626 }
 627
 628 static int intel_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
 629 {
 630         return pinctrl_gpio_direction_input(chip->base + offset);
 631 }
 632
 633 static int intel_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
 634                                        int value)
 635 {
 636         intel_gpio_set(chip, offset, value);
 637         return pinctrl_gpio_direction_output(chip->base + offset);
 638 }
 639
 640 static const struct gpio_chip intel_gpio_chip = {
 641         .owner = THIS_MODULE,
 642         .request = gpiochip_generic_request,
 643         .free = gpiochip_generic_free,
 644         .direction_input = intel_gpio_direction_input,
 645         .direction_output = intel_gpio_direction_output,
 646         .get = intel_gpio_get,
 647         .set = intel_gpio_set,
 648 };
 649
 650 static void intel_gpio_irq_ack(struct irq_data *d)
 651 {
 652         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 653         struct intel_pinctrl *pctrl = gpiochip_get_data(gc);
 654         const struct intel_community *community;
 655         unsigned pin = irqd_to_hwirq(d);
 656
 657         raw_spin_lock(&pctrl->lock);
 658
 659         community = intel_get_community(pctrl, pin);
 660         if (community) {
 661                 unsigned padno = pin_to_padno(community, pin);
 662                 unsigned gpp_offset = padno % community->gpp_size;
 663                 unsigned gpp = padno / community->gpp_size;
 664
 665                 writel(BIT(gpp_offset), community->regs + GPI_IS + gpp * 4);
 666         }
 667
 668         raw_spin_unlock(&pctrl->lock);
 669 }
 670
 671 static void intel_gpio_irq_enable(struct irq_data *d)
 672 {
 673         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 674         struct intel_pinctrl *pctrl = gpiochip_get_data(gc);
 675         const struct intel_community *community;
 676         unsigned pin = irqd_to_hwirq(d);
 677         unsigned long flags;
 678
 679         raw_spin_lock_irqsave(&pctrl->lock, flags);
 680
 681         community = intel_get_community(pctrl, pin);
 682         if (community) {
 683                 unsigned padno = pin_to_padno(community, pin);
 684                 unsigned gpp_size = community->gpp_size;
 685                 unsigned gpp_offset = padno % gpp_size;
 686                 unsigned gpp = padno / gpp_size;
 687                 u32 value;
 688
 689                 /* Clear interrupt status first to avoid unexpected interrupt */
 690                 writel(BIT(gpp_offset), community->regs + GPI_IS + gpp * 4);
 691
 692                 value = readl(community->regs + community->ie_offset + gpp * 4);
 693                 value |= BIT(gpp_offset);
 694                 writel(value, community->regs + community->ie_offset + gpp * 4);
 695         }
 696
 697         raw_spin_unlock_irqrestore(&pctrl->lock, flags);
 698 }
 699
 700 static void intel_gpio_irq_mask_unmask(struct irq_data *d, bool mask)
 701 {
 702         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 703         struct intel_pinctrl *pctrl = gpiochip_get_data(gc);
 704         const struct intel_community *community;
 705         unsigned pin = irqd_to_hwirq(d);
 706         unsigned long flags;
 707
 708         raw_spin_lock_irqsave(&pctrl->lock, flags);
 709
 710         community = intel_get_community(pctrl, pin);
 711         if (community) {
 712                 unsigned padno = pin_to_padno(community, pin);
 713                 unsigned gpp_offset = padno % community->gpp_size;
 714                 unsigned gpp = padno / community->gpp_size;
 715                 void __iomem *reg;
 716                 u32 value;
 717
 718                 reg = community->regs + community->ie_offset + gpp * 4;
 719                 value = readl(reg);
 720                 if (mask)
 721                         value &= ~BIT(gpp_offset);
 722                 else
 723                         value |= BIT(gpp_offset);
 724                 writel(value, reg);
 725         }
 726
 727         raw_spin_unlock_irqrestore(&pctrl->lock, flags);
 728 }
 729
 730 static void intel_gpio_irq_mask(struct irq_data *d)
 731 {
 732         intel_gpio_irq_mask_unmask(d, true);
 733 }
 734
 735 static void intel_gpio_irq_unmask(struct irq_data *d)
 736 {
 737         intel_gpio_irq_mask_unmask(d, false);
 738 }
 739
 740 static int intel_gpio_irq_type(struct irq_data *d, unsigned type)
 741 {
 742         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 743         struct intel_pinctrl *pctrl = gpiochip_get_data(gc);
 744         unsigned pin = irqd_to_hwirq(d);
 745         unsigned long flags;
 746         void __iomem *reg;
 747         u32 value;
 748
 749         reg = intel_get_padcfg(pctrl, pin, PADCFG0);
 750         if (!reg)
 751                 return -EINVAL;
 752
 753         /*
 754          * If the pin is in ACPI mode it is still usable as a GPIO but it
 755          * cannot be used as IRQ because GPI_IS status bit will not be
 756          * updated by the host controller hardware.
 757          */
 758         if (intel_pad_acpi_mode(pctrl, pin)) {
 759                 dev_warn(pctrl->dev, "pin %u cannot be used as IRQ\n", pin);
 760                 return -EPERM;
 761         }
 762
 763         raw_spin_lock_irqsave(&pctrl->lock, flags);
 764
 765         value = readl(reg);
 766
 767         value &= ~(PADCFG0_RXEVCFG_MASK | PADCFG0_RXINV);
 768
 769         if ((type & IRQ_TYPE_EDGE_BOTH) == IRQ_TYPE_EDGE_BOTH) {
 770                 value |= PADCFG0_RXEVCFG_EDGE_BOTH << PADCFG0_RXEVCFG_SHIFT;
 771         } else if (type & IRQ_TYPE_EDGE_FALLING) {
 772                 value |= PADCFG0_RXEVCFG_EDGE << PADCFG0_RXEVCFG_SHIFT;
 773                 value |= PADCFG0_RXINV;
 774         } else if (type & IRQ_TYPE_EDGE_RISING) {
 775                 value |= PADCFG0_RXEVCFG_EDGE << PADCFG0_RXEVCFG_SHIFT;
 776         } else if (type & IRQ_TYPE_LEVEL_MASK) {
 777                 if (type & IRQ_TYPE_LEVEL_LOW)
 778                         value |= PADCFG0_RXINV;
 779         } else {
 780                 value |= PADCFG0_RXEVCFG_DISABLED << PADCFG0_RXEVCFG_SHIFT;
 781         }
 782
 783         writel(value, reg);
 784
 785         if (type & IRQ_TYPE_EDGE_BOTH)
 786                 irq_set_handler_locked(d, handle_edge_irq);
 787         else if (type & IRQ_TYPE_LEVEL_MASK)
 788                 irq_set_handler_locked(d, handle_level_irq);
 789
 790         raw_spin_unlock_irqrestore(&pctrl->lock, flags);
 791
 792         return 0;
 793 }
 794
 795 static int intel_gpio_irq_wake(struct irq_data *d, unsigned int on)
 796 {
 797         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 798         struct intel_pinctrl *pctrl = gpiochip_get_data(gc);
 799         unsigned pin = irqd_to_hwirq(d);
 800
 801         if (on)
 802                 enable_irq_wake(pctrl->irq);
 803         else
 804                 disable_irq_wake(pctrl->irq);
 805
 806         dev_dbg(pctrl->dev, "%sable wake for pin %u\n", on ? "en" : "dis", pin);
 807         return 0;
 808 }
 809
 810 static irqreturn_t intel_gpio_community_irq_handler(struct intel_pinctrl *pctrl,
 811         const struct intel_community *community)
 812 {
 813         struct gpio_chip *gc = &pctrl->chip;
 814         irqreturn_t ret = IRQ_NONE;
 815         int gpp;
 816
 817         for (gpp = 0; gpp < community->ngpps; gpp++) {
 818                 unsigned long pending, enabled, gpp_offset;
 819
 820                 pending = readl(community->regs + GPI_IS + gpp * 4);
 821                 enabled = readl(community->regs + community->ie_offset +
 822                                 gpp * 4);
 823
 824                 /* Only interrupts that are enabled */
 825                 pending &= enabled;
 826
 827                 for_each_set_bit(gpp_offset, &pending, community->gpp_size) {
 828                         unsigned padno, irq;
 829
 830                         /*
 831                          * The last group in community can have less pins
 832                          * than NPADS_IN_GPP.
 833                          */
 834                         padno = gpp_offset + gpp * community->gpp_size;
 835                         if (padno >= community->npins)
 836                                 break;
 837
 838                         irq = irq_find_mapping(gc->irqdomain,
 839                                                community->pin_base + padno);
 840                         generic_handle_irq(irq);
 841
 842                         ret |= IRQ_HANDLED;
 843                 }
 844         }
 845
 846         return ret;
 847 }
 848
 849 static irqreturn_t intel_gpio_irq(int irq, void *data)
 850 {
 851         const struct intel_community *community;
 852         struct intel_pinctrl *pctrl = data;
 853         irqreturn_t ret = IRQ_NONE;
 854         int i;
 855
 856         /* Need to check all communities for pending interrupts */
 857         for (i = 0; i < pctrl->ncommunities; i++) {
 858                 community = &pctrl->communities[i];
 859                 ret |= intel_gpio_community_irq_handler(pctrl, community);
 860         }
 861
 862         return ret;
 863 }
 864
 865 static struct irq_chip intel_gpio_irqchip = {
 866         .name = "intel-gpio",
 867         .irq_enable = intel_gpio_irq_enable,
 868         .irq_ack = intel_gpio_irq_ack,
 869         .irq_mask = intel_gpio_irq_mask,
 870         .irq_unmask = intel_gpio_irq_unmask,
 871         .irq_set_type = intel_gpio_irq_type,
 872         .irq_set_wake = intel_gpio_irq_wake,
 873 };
 874
 875 static int intel_gpio_probe(struct intel_pinctrl *pctrl, int irq)
 876 {
 877         int ret;
 878
 879         pctrl->chip = intel_gpio_chip;
 880
 881         pctrl->chip.ngpio = pctrl->soc->npins;
 882         pctrl->chip.label = dev_name(pctrl->dev);
 883         pctrl->chip.parent = pctrl->dev;
 884         pctrl->chip.base = -1;
 885         pctrl->irq = irq;
 886
 887         ret = gpiochip_add_data(&pctrl->chip, pctrl);
 888         if (ret) {
 889                 dev_err(pctrl->dev, "failed to register gpiochip\n");
 890                 return ret;
 891         }
 892
 893         ret = gpiochip_add_pin_range(&pctrl->chip, dev_name(pctrl->dev),
 894                                      0, 0, pctrl->soc->npins);
 895         if (ret) {
 896                 dev_err(pctrl->dev, "failed to add GPIO pin range\n");
 897                 goto fail;
 898         }
 899
 900         /*
 901          * We need to request the interrupt here (instead of providing chip
 902          * to the irq directly) because on some platforms several GPIO
 903          * controllers share the same interrupt line.
 904          */
 905         ret = devm_request_irq(pctrl->dev, irq, intel_gpio_irq,
 906                                IRQF_SHARED | IRQF_NO_THREAD,
 907                                dev_name(pctrl->dev), pctrl);
 908         if (ret) {
 909                 dev_err(pctrl->dev, "failed to request interrupt\n");
 910                 goto fail;
 911         }
 912
 913         ret = gpiochip_irqchip_add(&pctrl->chip, &intel_gpio_irqchip, 0,
 914                                    handle_simple_irq, IRQ_TYPE_NONE);
 915         if (ret) {
 916                 dev_err(pctrl->dev, "failed to add irqchip\n");
 917                 goto fail;
 918         }
 919
 920         gpiochip_set_chained_irqchip(&pctrl->chip, &intel_gpio_irqchip, irq,
 921                                      NULL);
 922         return 0;
 923
 924 fail:
 925         gpiochip_remove(&pctrl->chip);
 926
 927         return ret;
 928 }
 929
 930 static int intel_pinctrl_pm_init(struct intel_pinctrl *pctrl)
 931 {
 932 #ifdef CONFIG_PM_SLEEP
 933         const struct intel_pinctrl_soc_data *soc = pctrl->soc;
 934         struct intel_community_context *communities;
 935         struct intel_pad_context *pads;
 936         int i;
 937
 938         pads = devm_kcalloc(pctrl->dev, soc->npins, sizeof(*pads), GFP_KERNEL);
 939         if (!pads)
 940                 return -ENOMEM;
 941
 942         communities = devm_kcalloc(pctrl->dev, pctrl->ncommunities,
 943                                    sizeof(*communities), GFP_KERNEL);
 944         if (!communities)
 945                 return -ENOMEM;
 946
 947
 948         for (i = 0; i < pctrl->ncommunities; i++) {
 949                 struct intel_community *community = &pctrl->communities[i];
 950                 u32 *intmask;
 951
 952                 intmask = devm_kcalloc(pctrl->dev, community->ngpps,
 953                                        sizeof(*intmask), GFP_KERNEL);
 954                 if (!intmask)
 955                         return -ENOMEM;
 956
 957                 communities[i].intmask = intmask;
 958         }
 959
 960         pctrl->context.pads = pads;
 961         pctrl->context.communities = communities;
 962 #endif
 963
 964         return 0;
 965 }
 966
 967 int intel_pinctrl_probe(struct platform_device *pdev,
 968                         const struct intel_pinctrl_soc_data *soc_data)
 969 {
 970         struct intel_pinctrl *pctrl;
 971         int i, ret, irq;
 972
 973         if (!soc_data)
 974                 return -EINVAL;
 975
 976         pctrl = devm_kzalloc(&pdev->dev, sizeof(*pctrl), GFP_KERNEL);
 977         if (!pctrl)
 978                 return -ENOMEM;
 979
 980         pctrl->dev = &pdev->dev;
 981         pctrl->soc = soc_data;
 982         raw_spin_lock_init(&pctrl->lock);
 983
 984         /*
 985          * Make a copy of the communities which we can use to hold pointers
 986          * to the registers.
 987          */
 988         pctrl->ncommunities = pctrl->soc->ncommunities;
 989         pctrl->communities = devm_kcalloc(&pdev->dev, pctrl->ncommunities,
 990                                   sizeof(*pctrl->communities), GFP_KERNEL);
 991         if (!pctrl->communities)
 992                 return -ENOMEM;
 993
 994         for (i = 0; i < pctrl->ncommunities; i++) {
 995                 struct intel_community *community = &pctrl->communities[i];
 996                 struct resource *res;
 997                 void __iomem *regs;
 998                 u32 padbar;
 999
1000                 *community = pctrl->soc->communities[i];
1001
1002                 res = platform_get_resource(pdev, IORESOURCE_MEM,
1003                                             community->barno);
1004                 regs = devm_ioremap_resource(&pdev->dev, res);
1005                 if (IS_ERR(regs))
1006                         return PTR_ERR(regs);
1007
1008                 /* Read offset of the pad configuration registers */
1009                 padbar = readl(regs + PADBAR);
1010
1011                 community->regs = regs;
1012                 community->pad_regs = regs + padbar;
1013                 community->ngpps = DIV_ROUND_UP(community->npins,
1014                                                 community->gpp_size);
1015         }
1016
1017         irq = platform_get_irq(pdev, 0);
1018         if (irq < 0) {
1019                 dev_err(&pdev->dev, "failed to get interrupt number\n");
1020                 return irq;
1021         }
1022
1023         ret = intel_pinctrl_pm_init(pctrl);
1024         if (ret)
1025                 return ret;
1026
1027         pctrl->pctldesc = intel_pinctrl_desc;
1028         pctrl->pctldesc.name = dev_name(&pdev->dev);
1029         pctrl->pctldesc.pins = pctrl->soc->pins;
1030         pctrl->pctldesc.npins = pctrl->soc->npins;
1031
1032         pctrl->pctldev = devm_pinctrl_register(&pdev->dev, &pctrl->pctldesc,
1033                                                pctrl);
1034         if (IS_ERR(pctrl->pctldev)) {
1035                 dev_err(&pdev->dev, "failed to register pinctrl driver\n");
1036                 return PTR_ERR(pctrl->pctldev);
1037         }
1038
1039         ret = intel_gpio_probe(pctrl, irq);
1040         if (ret)
1041                 return ret;
1042
1043         platform_set_drvdata(pdev, pctrl);
1044
1045         return 0;
1046 }
1047 EXPORT_SYMBOL_GPL(intel_pinctrl_probe);
1048
1049 int intel_pinctrl_remove(struct platform_device *pdev)
1050 {
1051         struct intel_pinctrl *pctrl = platform_get_drvdata(pdev);
1052
1053         gpiochip_remove(&pctrl->chip);
1054
1055         return 0;
1056 }
1057 EXPORT_SYMBOL_GPL(intel_pinctrl_remove);
1058
1059 #ifdef CONFIG_PM_SLEEP
1060 static bool intel_pinctrl_should_save(struct intel_pinctrl *pctrl, unsigned pin)
1061 {
1062         const struct pin_desc *pd = pin_desc_get(pctrl->pctldev, pin);
1063
1064         if (!pd || !intel_pad_usable(pctrl, pin))
1065                 return false;
1066
1067         /*
1068          * Only restore the pin if it is actually in use by the kernel (or
1069          * by userspace). It is possible that some pins are used by the
1070          * BIOS during resume and those are not always locked down so leave
1071          * them alone.
1072          */
1073         if (pd->mux_owner || pd->gpio_owner ||
1074             gpiochip_line_is_irq(&pctrl->chip, pin))
1075                 return true;
1076
1077         return false;
1078 }
1079
1080 int intel_pinctrl_suspend(struct device *dev)
1081 {
1082         struct platform_device *pdev = to_platform_device(dev);
1083         struct intel_pinctrl *pctrl = platform_get_drvdata(pdev);
1084         struct intel_community_context *communities;
1085         struct intel_pad_context *pads;
1086         int i;
1087
1088         pads = pctrl->context.pads;
1089         for (i = 0; i < pctrl->soc->npins; i++) {
1090                 const struct pinctrl_pin_desc *desc = &pctrl->soc->pins[i];
1091                 u32 val;
1092
1093                 if (!intel_pinctrl_should_save(pctrl, desc->number))
1094                         continue;
1095
1096                 val = readl(intel_get_padcfg(pctrl, desc->number, PADCFG0));
1097                 pads[i].padcfg0 = val & ~PADCFG0_GPIORXSTATE;
1098                 val = readl(intel_get_padcfg(pctrl, desc->number, PADCFG1));
1099                 pads[i].padcfg1 = val;
1100         }
1101
1102         communities = pctrl->context.communities;
1103         for (i = 0; i < pctrl->ncommunities; i++) {
1104                 struct intel_community *community = &pctrl->communities[i];
1105                 void __iomem *base;
1106                 unsigned gpp;
1107
1108                 base = community->regs + community->ie_offset;
1109                 for (gpp = 0; gpp < community->ngpps; gpp++)
1110                         communities[i].intmask[gpp] = readl(base + gpp * 4);
1111         }
1112
1113         return 0;
1114 }
1115 EXPORT_SYMBOL_GPL(intel_pinctrl_suspend);
1116
1117 static void intel_gpio_irq_init(struct intel_pinctrl *pctrl)
1118 {
1119         size_t i;
1120
1121         for (i = 0; i < pctrl->ncommunities; i++) {
1122                 const struct intel_community *community;
1123                 void __iomem *base;
1124                 unsigned gpp;
1125
1126                 community = &pctrl->communities[i];
1127                 base = community->regs;
1128
1129                 for (gpp = 0; gpp < community->ngpps; gpp++) {
1130                         /* Mask and clear all interrupts */
1131                         writel(0, base + community->ie_offset + gpp * 4);
1132                         writel(0xffff, base + GPI_IS + gpp * 4);
1133                 }
1134         }
1135 }
1136
1137 int intel_pinctrl_resume(struct device *dev)
1138 {
1139         struct platform_device *pdev = to_platform_device(dev);
1140         struct intel_pinctrl *pctrl = platform_get_drvdata(pdev);
1141         const struct intel_community_context *communities;
1142         const struct intel_pad_context *pads;
1143         int i;
1144
1145         /* Mask all interrupts */
1146         intel_gpio_irq_init(pctrl);
1147
1148         pads = pctrl->context.pads;
1149         for (i = 0; i < pctrl->soc->npins; i++) {
1150                 const struct pinctrl_pin_desc *desc = &pctrl->soc->pins[i];
1151                 void __iomem *padcfg;
1152                 u32 val;
1153
1154                 if (!intel_pinctrl_should_save(pctrl, desc->number))
1155                         continue;
1156
1157                 padcfg = intel_get_padcfg(pctrl, desc->number, PADCFG0);
1158                 val = readl(padcfg) & ~PADCFG0_GPIORXSTATE;
1159                 if (val != pads[i].padcfg0) {
1160                         writel(pads[i].padcfg0, padcfg);
1161                         dev_dbg(dev, "restored pin %u padcfg0 %#08x\n",
1162                                 desc->number, readl(padcfg));
1163                 }
1164
1165                 padcfg = intel_get_padcfg(pctrl, desc->number, PADCFG1);
1166                 val = readl(padcfg);
1167                 if (val != pads[i].padcfg1) {
1168                         writel(pads[i].padcfg1, padcfg);
1169                         dev_dbg(dev, "restored pin %u padcfg1 %#08x\n",
1170                                 desc->number, readl(padcfg));
1171                 }
1172         }
1173
1174         communities = pctrl->context.communities;
1175         for (i = 0; i < pctrl->ncommunities; i++) {
1176                 struct intel_community *community = &pctrl->communities[i];
1177                 void __iomem *base;
1178                 unsigned gpp;
1179
1180                 base = community->regs + community->ie_offset;
1181                 for (gpp = 0; gpp < community->ngpps; gpp++) {
1182                         writel(communities[i].intmask[gpp], base + gpp * 4);
1183                         dev_dbg(dev, "restored mask %d/%u %#08x\n", i, gpp,
1184                                 readl(base + gpp * 4));
1185                 }
1186         }
1187
1188         return 0;
1189 }
1190 EXPORT_SYMBOL_GPL(intel_pinctrl_resume);
1191 #endif
1192
1193 MODULE_AUTHOR("Mathias Nyman <mathias.nyman@linux.intel.com>");
1194 MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>");
1195 MODULE_DESCRIPTION("Intel pinctrl/GPIO core driver");
1196 MODULE_LICENSE("GPL v2");