drivers/gpio/gpio-omap.c

   1 /*
   2  * Support functions for OMAP GPIO
   3  *
   4  * Copyright (C) 2003-2005 Nokia Corporation
   5  * Written by Juha Yrjölä <juha.yrjola@nokia.com>
   6  *
   7  * Copyright (C) 2009 Texas Instruments
   8  * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/init.h>
  16 #include <linux/module.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/syscore_ops.h>
  19 #include <linux/err.h>
  20 #include <linux/clk.h>
  21 #include <linux/io.h>
  22 #include <linux/device.h>
  23 #include <linux/pm_runtime.h>
  24 #include <linux/pm.h>
  25 #include <linux/of.h>
  26 #include <linux/of_device.h>
  27 #include <linux/gpio.h>
  28 #include <linux/bitops.h>
  29 #include <linux/platform_data/gpio-omap.h>
  30
  31 #define OFF_MODE        1
  32 #define OMAP4_GPIO_DEBOUNCINGTIME_MASK 0xFF
  33
  34 static LIST_HEAD(omap_gpio_list);
  35
  36 struct gpio_regs {
  37         u32 irqenable1;
  38         u32 irqenable2;
  39         u32 wake_en;
  40         u32 ctrl;
  41         u32 oe;
  42         u32 leveldetect0;
  43         u32 leveldetect1;
  44         u32 risingdetect;
  45         u32 fallingdetect;
  46         u32 dataout;
  47         u32 debounce;
  48         u32 debounce_en;
  49 };
  50
  51 struct gpio_bank {
  52         struct list_head node;
  53         void __iomem *base;
  54         int irq;
  55         u32 non_wakeup_gpios;
  56         u32 enabled_non_wakeup_gpios;
  57         struct gpio_regs context;
  58         u32 saved_datain;
  59         u32 level_mask;
  60         u32 toggle_mask;
  61         raw_spinlock_t lock;
  62         raw_spinlock_t wa_lock;
  63         struct gpio_chip chip;
  64         struct clk *dbck;
  65         u32 mod_usage;
  66         u32 irq_usage;
  67         u32 dbck_enable_mask;
  68         bool dbck_enabled;
  69         bool is_mpuio;
  70         bool dbck_flag;
  71         bool loses_context;
  72         bool context_valid;
  73         int stride;
  74         u32 width;
  75         int context_loss_count;
  76         int power_mode;
  77         bool workaround_enabled;
  78
  79         void (*set_dataout)(struct gpio_bank *bank, unsigned gpio, int enable);
  80         int (*get_context_loss_count)(struct device *dev);
  81
  82         struct omap_gpio_reg_offs *regs;
  83 };
  84
  85 #define GPIO_MOD_CTRL_BIT       BIT(0)
  86
  87 #define BANK_USED(bank) (bank->mod_usage || bank->irq_usage)
  88 #define LINE_USED(line, offset) (line & (BIT(offset)))
  89
  90 static void omap_gpio_unmask_irq(struct irq_data *d);
  91
  92 static inline struct gpio_bank *omap_irq_data_get_bank(struct irq_data *d)
  93 {
  94         struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
  95         return gpiochip_get_data(chip);
  96 }
  97
  98 static void omap_set_gpio_direction(struct gpio_bank *bank, int gpio,
  99                                     int is_input)
 100 {
 101         void __iomem *reg = bank->base;
 102         u32 l;
 103
 104         reg += bank->regs->direction;
 105         l = readl_relaxed(reg);
 106         if (is_input)
 107                 l |= BIT(gpio);
 108         else
 109                 l &= ~(BIT(gpio));
 110         writel_relaxed(l, reg);
 111         bank->context.oe = l;
 112 }
 113
 114
 115 /* set data out value using dedicate set/clear register */
 116 static void omap_set_gpio_dataout_reg(struct gpio_bank *bank, unsigned offset,
 117                                       int enable)
 118 {
 119         void __iomem *reg = bank->base;
 120         u32 l = BIT(offset);
 121
 122         if (enable) {
 123                 reg += bank->regs->set_dataout;
 124                 bank->context.dataout |= l;
 125         } else {
 126                 reg += bank->regs->clr_dataout;
 127                 bank->context.dataout &= ~l;
 128         }
 129
 130         writel_relaxed(l, reg);
 131 }
 132
 133 /* set data out value using mask register */
 134 static void omap_set_gpio_dataout_mask(struct gpio_bank *bank, unsigned offset,
 135                                        int enable)
 136 {
 137         void __iomem *reg = bank->base + bank->regs->dataout;
 138         u32 gpio_bit = BIT(offset);
 139         u32 l;
 140
 141         l = readl_relaxed(reg);
 142         if (enable)
 143                 l |= gpio_bit;
 144         else
 145                 l &= ~gpio_bit;
 146         writel_relaxed(l, reg);
 147         bank->context.dataout = l;
 148 }
 149
 150 static int omap_get_gpio_datain(struct gpio_bank *bank, int offset)
 151 {
 152         void __iomem *reg = bank->base + bank->regs->datain;
 153
 154         return (readl_relaxed(reg) & (BIT(offset))) != 0;
 155 }
 156
 157 static int omap_get_gpio_dataout(struct gpio_bank *bank, int offset)
 158 {
 159         void __iomem *reg = bank->base + bank->regs->dataout;
 160
 161         return (readl_relaxed(reg) & (BIT(offset))) != 0;
 162 }
 163
 164 static inline void omap_gpio_rmw(void __iomem *base, u32 reg, u32 mask, bool set)
 165 {
 166         int l = readl_relaxed(base + reg);
 167
 168         if (set)
 169                 l |= mask;
 170         else
 171                 l &= ~mask;
 172
 173         writel_relaxed(l, base + reg);
 174 }
 175
 176 static inline void omap_gpio_dbck_enable(struct gpio_bank *bank)
 177 {
 178         if (bank->dbck_enable_mask && !bank->dbck_enabled) {
 179                 clk_enable(bank->dbck);
 180                 bank->dbck_enabled = true;
 181
 182                 writel_relaxed(bank->dbck_enable_mask,
 183                              bank->base + bank->regs->debounce_en);
 184         }
 185 }
 186
 187 static inline void omap_gpio_dbck_disable(struct gpio_bank *bank)
 188 {
 189         if (bank->dbck_enable_mask && bank->dbck_enabled) {
 190                 /*
 191                  * Disable debounce before cutting it's clock. If debounce is
 192                  * enabled but the clock is not, GPIO module seems to be unable
 193                  * to detect events and generate interrupts at least on OMAP3.
 194                  */
 195                 writel_relaxed(0, bank->base + bank->regs->debounce_en);
 196
 197                 clk_disable(bank->dbck);
 198                 bank->dbck_enabled = false;
 199         }
 200 }
 201
 202 /**
 203  * omap2_set_gpio_debounce - low level gpio debounce time
 204  * @bank: the gpio bank we're acting upon
 205  * @offset: the gpio number on this @bank
 206  * @debounce: debounce time to use
 207  *
 208  * OMAP's debounce time is in 31us steps
 209  *   <debounce time> = (GPIO_DEBOUNCINGTIME[7:0].DEBOUNCETIME + 1) x 31
 210  * so we need to convert and round up to the closest unit.
 211  *
 212  * Return: 0 on success, negative error otherwise.
 213  */
 214 static int omap2_set_gpio_debounce(struct gpio_bank *bank, unsigned offset,
 215                                    unsigned debounce)
 216 {
 217         void __iomem            *reg;
 218         u32                     val;
 219         u32                     l;
 220         bool                    enable = !!debounce;
 221
 222         if (!bank->dbck_flag)
 223                 return -ENOTSUPP;
 224
 225         if (enable) {
 226                 debounce = DIV_ROUND_UP(debounce, 31) - 1;
 227                 if ((debounce & OMAP4_GPIO_DEBOUNCINGTIME_MASK) != debounce)
 228                         return -EINVAL;
 229         }
 230
 231         l = BIT(offset);
 232
 233         clk_enable(bank->dbck);
 234         reg = bank->base + bank->regs->debounce;
 235         writel_relaxed(debounce, reg);
 236
 237         reg = bank->base + bank->regs->debounce_en;
 238         val = readl_relaxed(reg);
 239
 240         if (enable)
 241                 val |= l;
 242         else
 243                 val &= ~l;
 244         bank->dbck_enable_mask = val;
 245
 246         writel_relaxed(val, reg);
 247         clk_disable(bank->dbck);
 248         /*
 249          * Enable debounce clock per module.
 250          * This call is mandatory because in omap_gpio_request() when
 251          * *_runtime_get_sync() is called,  _gpio_dbck_enable() within
 252          * runtime callbck fails to turn on dbck because dbck_enable_mask
 253          * used within _gpio_dbck_enable() is still not initialized at
 254          * that point. Therefore we have to enable dbck here.
 255          */
 256         omap_gpio_dbck_enable(bank);
 257         if (bank->dbck_enable_mask) {
 258                 bank->context.debounce = debounce;
 259                 bank->context.debounce_en = val;
 260         }
 261
 262         return 0;
 263 }
 264
 265 /**
 266  * omap_clear_gpio_debounce - clear debounce settings for a gpio
 267  * @bank: the gpio bank we're acting upon
 268  * @offset: the gpio number on this @bank
 269  *
 270  * If a gpio is using debounce, then clear the debounce enable bit and if
 271  * this is the only gpio in this bank using debounce, then clear the debounce
 272  * time too. The debounce clock will also be disabled when calling this function
 273  * if this is the only gpio in the bank using debounce.
 274  */
 275 static void omap_clear_gpio_debounce(struct gpio_bank *bank, unsigned offset)
 276 {
 277         u32 gpio_bit = BIT(offset);
 278
 279         if (!bank->dbck_flag)
 280                 return;
 281
 282         if (!(bank->dbck_enable_mask & gpio_bit))
 283                 return;
 284
 285         bank->dbck_enable_mask &= ~gpio_bit;
 286         bank->context.debounce_en &= ~gpio_bit;
 287         writel_relaxed(bank->context.debounce_en,
 288                      bank->base + bank->regs->debounce_en);
 289
 290         if (!bank->dbck_enable_mask) {
 291                 bank->context.debounce = 0;
 292                 writel_relaxed(bank->context.debounce, bank->base +
 293                              bank->regs->debounce);
 294                 clk_disable(bank->dbck);
 295                 bank->dbck_enabled = false;
 296         }
 297 }
 298
 299 static inline void omap_set_gpio_trigger(struct gpio_bank *bank, int gpio,
 300                                                 unsigned trigger)
 301 {
 302         void __iomem *base = bank->base;
 303         u32 gpio_bit = BIT(gpio);
 304
 305         omap_gpio_rmw(base, bank->regs->leveldetect0, gpio_bit,
 306                       trigger & IRQ_TYPE_LEVEL_LOW);
 307         omap_gpio_rmw(base, bank->regs->leveldetect1, gpio_bit,
 308                       trigger & IRQ_TYPE_LEVEL_HIGH);
 309         omap_gpio_rmw(base, bank->regs->risingdetect, gpio_bit,
 310                       trigger & IRQ_TYPE_EDGE_RISING);
 311         omap_gpio_rmw(base, bank->regs->fallingdetect, gpio_bit,
 312                       trigger & IRQ_TYPE_EDGE_FALLING);
 313
 314         bank->context.leveldetect0 =
 315                         readl_relaxed(bank->base + bank->regs->leveldetect0);
 316         bank->context.leveldetect1 =
 317                         readl_relaxed(bank->base + bank->regs->leveldetect1);
 318         bank->context.risingdetect =
 319                         readl_relaxed(bank->base + bank->regs->risingdetect);
 320         bank->context.fallingdetect =
 321                         readl_relaxed(bank->base + bank->regs->fallingdetect);
 322
 323         if (likely(!(bank->non_wakeup_gpios & gpio_bit))) {
 324                 omap_gpio_rmw(base, bank->regs->wkup_en, gpio_bit, trigger != 0);
 325                 bank->context.wake_en =
 326                         readl_relaxed(bank->base + bank->regs->wkup_en);
 327         }
 328
 329         /* This part needs to be executed always for OMAP{34xx, 44xx} */
 330         if (!bank->regs->irqctrl) {
 331                 /* On omap24xx proceed only when valid GPIO bit is set */
 332                 if (bank->non_wakeup_gpios) {
 333                         if (!(bank->non_wakeup_gpios & gpio_bit))
 334                                 goto exit;
 335                 }
 336
 337                 /*
 338                  * Log the edge gpio and manually trigger the IRQ
 339                  * after resume if the input level changes
 340                  * to avoid irq lost during PER RET/OFF mode
 341                  * Applies for omap2 non-wakeup gpio and all omap3 gpios
 342                  */
 343                 if (trigger & IRQ_TYPE_EDGE_BOTH)
 344                         bank->enabled_non_wakeup_gpios |= gpio_bit;
 345                 else
 346                         bank->enabled_non_wakeup_gpios &= ~gpio_bit;
 347         }
 348
 349 exit:
 350         bank->level_mask =
 351                 readl_relaxed(bank->base + bank->regs->leveldetect0) |
 352                 readl_relaxed(bank->base + bank->regs->leveldetect1);
 353 }
 354
 355 #ifdef CONFIG_ARCH_OMAP1
 356 /*
 357  * This only applies to chips that can't do both rising and falling edge
 358  * detection at once.  For all other chips, this function is a noop.
 359  */
 360 static void omap_toggle_gpio_edge_triggering(struct gpio_bank *bank, int gpio)
 361 {
 362         void __iomem *reg = bank->base;
 363         u32 l = 0;
 364
 365         if (!bank->regs->irqctrl)
 366                 return;
 367
 368         reg += bank->regs->irqctrl;
 369
 370         l = readl_relaxed(reg);
 371         if ((l >> gpio) & 1)
 372                 l &= ~(BIT(gpio));
 373         else
 374                 l |= BIT(gpio);
 375
 376         writel_relaxed(l, reg);
 377 }
 378 #else
 379 static void omap_toggle_gpio_edge_triggering(struct gpio_bank *bank, int gpio) {}
 380 #endif
 381
 382 static int omap_set_gpio_triggering(struct gpio_bank *bank, int gpio,
 383                                     unsigned trigger)
 384 {
 385         void __iomem *reg = bank->base;
 386         void __iomem *base = bank->base;
 387         u32 l = 0;
 388
 389         if (bank->regs->leveldetect0 && bank->regs->wkup_en) {
 390                 omap_set_gpio_trigger(bank, gpio, trigger);
 391         } else if (bank->regs->irqctrl) {
 392                 reg += bank->regs->irqctrl;
 393
 394                 l = readl_relaxed(reg);
 395                 if ((trigger & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH)
 396                         bank->toggle_mask |= BIT(gpio);
 397                 if (trigger & IRQ_TYPE_EDGE_RISING)
 398                         l |= BIT(gpio);
 399                 else if (trigger & IRQ_TYPE_EDGE_FALLING)
 400                         l &= ~(BIT(gpio));
 401                 else
 402                         return -EINVAL;
 403
 404                 writel_relaxed(l, reg);
 405         } else if (bank->regs->edgectrl1) {
 406                 if (gpio & 0x08)
 407                         reg += bank->regs->edgectrl2;
 408                 else
 409                         reg += bank->regs->edgectrl1;
 410
 411                 gpio &= 0x07;
 412                 l = readl_relaxed(reg);
 413                 l &= ~(3 << (gpio << 1));
 414                 if (trigger & IRQ_TYPE_EDGE_RISING)
 415                         l |= 2 << (gpio << 1);
 416                 if (trigger & IRQ_TYPE_EDGE_FALLING)
 417                         l |= BIT(gpio << 1);
 418
 419                 /* Enable wake-up during idle for dynamic tick */
 420                 omap_gpio_rmw(base, bank->regs->wkup_en, BIT(gpio), trigger);
 421                 bank->context.wake_en =
 422                         readl_relaxed(bank->base + bank->regs->wkup_en);
 423                 writel_relaxed(l, reg);
 424         }
 425         return 0;
 426 }
 427
 428 static void omap_enable_gpio_module(struct gpio_bank *bank, unsigned offset)
 429 {
 430         if (bank->regs->pinctrl) {
 431                 void __iomem *reg = bank->base + bank->regs->pinctrl;
 432
 433                 /* Claim the pin for MPU */
 434                 writel_relaxed(readl_relaxed(reg) | (BIT(offset)), reg);
 435         }
 436
 437         if (bank->regs->ctrl && !BANK_USED(bank)) {
 438                 void __iomem *reg = bank->base + bank->regs->ctrl;
 439                 u32 ctrl;
 440
 441                 ctrl = readl_relaxed(reg);
 442                 /* Module is enabled, clocks are not gated */
 443                 ctrl &= ~GPIO_MOD_CTRL_BIT;
 444                 writel_relaxed(ctrl, reg);
 445                 bank->context.ctrl = ctrl;
 446         }
 447 }
 448
 449 static void omap_disable_gpio_module(struct gpio_bank *bank, unsigned offset)
 450 {
 451         void __iomem *base = bank->base;
 452
 453         if (bank->regs->wkup_en &&
 454             !LINE_USED(bank->mod_usage, offset) &&
 455             !LINE_USED(bank->irq_usage, offset)) {
 456                 /* Disable wake-up during idle for dynamic tick */
 457                 omap_gpio_rmw(base, bank->regs->wkup_en, BIT(offset), 0);
 458                 bank->context.wake_en =
 459                         readl_relaxed(bank->base + bank->regs->wkup_en);
 460         }
 461
 462         if (bank->regs->ctrl && !BANK_USED(bank)) {
 463                 void __iomem *reg = bank->base + bank->regs->ctrl;
 464                 u32 ctrl;
 465
 466                 ctrl = readl_relaxed(reg);
 467                 /* Module is disabled, clocks are gated */
 468                 ctrl |= GPIO_MOD_CTRL_BIT;
 469                 writel_relaxed(ctrl, reg);
 470                 bank->context.ctrl = ctrl;
 471         }
 472 }
 473
 474 static int omap_gpio_is_input(struct gpio_bank *bank, unsigned offset)
 475 {
 476         void __iomem *reg = bank->base + bank->regs->direction;
 477
 478         return readl_relaxed(reg) & BIT(offset);
 479 }
 480
 481 static void omap_gpio_init_irq(struct gpio_bank *bank, unsigned offset)
 482 {
 483         if (!LINE_USED(bank->mod_usage, offset)) {
 484                 omap_enable_gpio_module(bank, offset);
 485                 omap_set_gpio_direction(bank, offset, 1);
 486         }
 487         bank->irq_usage |= BIT(offset);
 488 }
 489
 490 static int omap_gpio_irq_type(struct irq_data *d, unsigned type)
 491 {
 492         struct gpio_bank *bank = omap_irq_data_get_bank(d);
 493         int retval;
 494         unsigned long flags;
 495         unsigned offset = d->hwirq;
 496
 497         if (type & ~IRQ_TYPE_SENSE_MASK)
 498                 return -EINVAL;
 499
 500         if (!bank->regs->leveldetect0 &&
 501                 (type & (IRQ_TYPE_LEVEL_LOW|IRQ_TYPE_LEVEL_HIGH)))
 502                 return -EINVAL;
 503
 504         raw_spin_lock_irqsave(&bank->lock, flags);
 505         retval = omap_set_gpio_triggering(bank, offset, type);
 506         if (retval) {
 507                 raw_spin_unlock_irqrestore(&bank->lock, flags);
 508                 goto error;
 509         }
 510         omap_gpio_init_irq(bank, offset);
 511         if (!omap_gpio_is_input(bank, offset)) {
 512                 raw_spin_unlock_irqrestore(&bank->lock, flags);
 513                 retval = -EINVAL;
 514                 goto error;
 515         }
 516         raw_spin_unlock_irqrestore(&bank->lock, flags);
 517
 518         if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
 519                 irq_set_handler_locked(d, handle_level_irq);
 520         else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
 521                 irq_set_handler_locked(d, handle_edge_irq);
 522
 523         return 0;
 524
 525 error:
 526         return retval;
 527 }
 528
 529 static void omap_clear_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
 530 {
 531         void __iomem *reg = bank->base;
 532
 533         reg += bank->regs->irqstatus;
 534         writel_relaxed(gpio_mask, reg);
 535
 536         /* Workaround for clearing DSP GPIO interrupts to allow retention */
 537         if (bank->regs->irqstatus2) {
 538                 reg = bank->base + bank->regs->irqstatus2;
 539                 writel_relaxed(gpio_mask, reg);
 540         }
 541
 542         /* Flush posted write for the irq status to avoid spurious interrupts */
 543         readl_relaxed(reg);
 544 }
 545
 546 static inline void omap_clear_gpio_irqstatus(struct gpio_bank *bank,
 547                                              unsigned offset)
 548 {
 549         omap_clear_gpio_irqbank(bank, BIT(offset));
 550 }
 551
 552 static u32 omap_get_gpio_irqbank_mask(struct gpio_bank *bank)
 553 {
 554         void __iomem *reg = bank->base;
 555         u32 l;
 556         u32 mask = (BIT(bank->width)) - 1;
 557
 558         reg += bank->regs->irqenable;
 559         l = readl_relaxed(reg);
 560         if (bank->regs->irqenable_inv)
 561                 l = ~l;
 562         l &= mask;
 563         return l;
 564 }
 565
 566 static void omap_enable_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
 567 {
 568         void __iomem *reg = bank->base;
 569         u32 l;
 570
 571         if (bank->regs->set_irqenable) {
 572                 reg += bank->regs->set_irqenable;
 573                 l = gpio_mask;
 574                 bank->context.irqenable1 |= gpio_mask;
 575         } else {
 576                 reg += bank->regs->irqenable;
 577                 l = readl_relaxed(reg);
 578                 if (bank->regs->irqenable_inv)
 579                         l &= ~gpio_mask;
 580                 else
 581                         l |= gpio_mask;
 582                 bank->context.irqenable1 = l;
 583         }
 584
 585         writel_relaxed(l, reg);
 586 }
 587
 588 static void omap_disable_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
 589 {
 590         void __iomem *reg = bank->base;
 591         u32 l;
 592
 593         if (bank->regs->clr_irqenable) {
 594                 reg += bank->regs->clr_irqenable;
 595                 l = gpio_mask;
 596                 bank->context.irqenable1 &= ~gpio_mask;
 597         } else {
 598                 reg += bank->regs->irqenable;
 599                 l = readl_relaxed(reg);
 600                 if (bank->regs->irqenable_inv)
 601                         l |= gpio_mask;
 602                 else
 603                         l &= ~gpio_mask;
 604                 bank->context.irqenable1 = l;
 605         }
 606
 607         writel_relaxed(l, reg);
 608 }
 609
 610 static inline void omap_set_gpio_irqenable(struct gpio_bank *bank,
 611                                            unsigned offset, int enable)
 612 {
 613         if (enable)
 614                 omap_enable_gpio_irqbank(bank, BIT(offset));
 615         else
 616                 omap_disable_gpio_irqbank(bank, BIT(offset));
 617 }
 618
 619 /* Use disable_irq_wake() and enable_irq_wake() functions from drivers */
 620 static int omap_gpio_wake_enable(struct irq_data *d, unsigned int enable)
 621 {
 622         struct gpio_bank *bank = omap_irq_data_get_bank(d);
 623
 624         return irq_set_irq_wake(bank->irq, enable);
 625 }
 626
 627 static int omap_gpio_request(struct gpio_chip *chip, unsigned offset)
 628 {
 629         struct gpio_bank *bank = gpiochip_get_data(chip);
 630         unsigned long flags;
 631
 632         /*
 633          * If this is the first gpio_request for the bank,
 634          * enable the bank module.
 635          */
 636         if (!BANK_USED(bank))
 637                 pm_runtime_get_sync(chip->parent);
 638
 639         raw_spin_lock_irqsave(&bank->lock, flags);
 640         omap_enable_gpio_module(bank, offset);
 641         bank->mod_usage |= BIT(offset);
 642         raw_spin_unlock_irqrestore(&bank->lock, flags);
 643
 644         return 0;
 645 }
 646
 647 static void omap_gpio_free(struct gpio_chip *chip, unsigned offset)
 648 {
 649         struct gpio_bank *bank = gpiochip_get_data(chip);
 650         unsigned long flags;
 651
 652         raw_spin_lock_irqsave(&bank->lock, flags);
 653         bank->mod_usage &= ~(BIT(offset));
 654         if (!LINE_USED(bank->irq_usage, offset)) {
 655                 omap_set_gpio_direction(bank, offset, 1);
 656                 omap_clear_gpio_debounce(bank, offset);
 657         }
 658         omap_disable_gpio_module(bank, offset);
 659         raw_spin_unlock_irqrestore(&bank->lock, flags);
 660
 661         /*
 662          * If this is the last gpio to be freed in the bank,
 663          * disable the bank module.
 664          */
 665         if (!BANK_USED(bank))
 666                 pm_runtime_put(chip->parent);
 667 }
 668
 669 /*
 670  * We need to unmask the GPIO bank interrupt as soon as possible to
 671  * avoid missing GPIO interrupts for other lines in the bank.
 672  * Then we need to mask-read-clear-unmask the triggered GPIO lines
 673  * in the bank to avoid missing nested interrupts for a GPIO line.
 674  * If we wait to unmask individual GPIO lines in the bank after the
 675  * line's interrupt handler has been run, we may miss some nested
 676  * interrupts.
 677  */
 678 static irqreturn_t omap_gpio_irq_handler(int irq, void *gpiobank)
 679 {
 680         void __iomem *isr_reg = NULL;
 681         u32 isr;
 682         unsigned int bit;
 683         struct gpio_bank *bank = gpiobank;
 684         unsigned long wa_lock_flags;
 685         unsigned long lock_flags;
 686
 687         isr_reg = bank->base + bank->regs->irqstatus;
 688         if (WARN_ON(!isr_reg))
 689                 goto exit;
 690
 691         pm_runtime_get_sync(bank->chip.parent);
 692
 693         while (1) {
 694                 u32 isr_saved, level_mask = 0;
 695                 u32 enabled;
 696
 697                 raw_spin_lock_irqsave(&bank->lock, lock_flags);
 698
 699                 enabled = omap_get_gpio_irqbank_mask(bank);
 700                 isr_saved = isr = readl_relaxed(isr_reg) & enabled;
 701
 702                 if (bank->level_mask)
 703                         level_mask = bank->level_mask & enabled;
 704
 705                 /* clear edge sensitive interrupts before handler(s) are
 706                 called so that we don't miss any interrupt occurred while
 707                 executing them */
 708                 omap_disable_gpio_irqbank(bank, isr_saved & ~level_mask);
 709                 omap_clear_gpio_irqbank(bank, isr_saved & ~level_mask);
 710                 omap_enable_gpio_irqbank(bank, isr_saved & ~level_mask);
 711
 712                 raw_spin_unlock_irqrestore(&bank->lock, lock_flags);
 713
 714                 if (!isr)
 715                         break;
 716
 717                 while (isr) {
 718                         bit = __ffs(isr);
 719                         isr &= ~(BIT(bit));
 720
 721                         raw_spin_lock_irqsave(&bank->lock, lock_flags);
 722                         /*
 723                          * Some chips can't respond to both rising and falling
 724                          * at the same time.  If this irq was requested with
 725                          * both flags, we need to flip the ICR data for the IRQ
 726                          * to respond to the IRQ for the opposite direction.
 727                          * This will be indicated in the bank toggle_mask.
 728                          */
 729                         if (bank->toggle_mask & (BIT(bit)))
 730                                 omap_toggle_gpio_edge_triggering(bank, bit);
 731
 732                         raw_spin_unlock_irqrestore(&bank->lock, lock_flags);
 733
 734                         raw_spin_lock_irqsave(&bank->wa_lock, wa_lock_flags);
 735
 736                         generic_handle_irq(irq_find_mapping(bank->chip.irqdomain,
 737                                                             bit));
 738
 739                         raw_spin_unlock_irqrestore(&bank->wa_lock,
 740                                                    wa_lock_flags);
 741                 }
 742         }
 743 exit:
 744         pm_runtime_put(bank->chip.parent);
 745         return IRQ_HANDLED;
 746 }
 747
 748 static unsigned int omap_gpio_irq_startup(struct irq_data *d)
 749 {
 750         struct gpio_bank *bank = omap_irq_data_get_bank(d);
 751         unsigned long flags;
 752         unsigned offset = d->hwirq;
 753
 754         raw_spin_lock_irqsave(&bank->lock, flags);
 755
 756         if (!LINE_USED(bank->mod_usage, offset))
 757                 omap_set_gpio_direction(bank, offset, 1);
 758         else if (!omap_gpio_is_input(bank, offset))
 759                 goto err;
 760         omap_enable_gpio_module(bank, offset);
 761         bank->irq_usage |= BIT(offset);
 762
 763         raw_spin_unlock_irqrestore(&bank->lock, flags);
 764         omap_gpio_unmask_irq(d);
 765
 766         return 0;
 767 err:
 768         raw_spin_unlock_irqrestore(&bank->lock, flags);
 769         return -EINVAL;
 770 }
 771
 772 static void omap_gpio_irq_shutdown(struct irq_data *d)
 773 {
 774         struct gpio_bank *bank = omap_irq_data_get_bank(d);
 775         unsigned long flags;
 776         unsigned offset = d->hwirq;
 777
 778         raw_spin_lock_irqsave(&bank->lock, flags);
 779         bank->irq_usage &= ~(BIT(offset));
 780         omap_set_gpio_irqenable(bank, offset, 0);
 781         omap_clear_gpio_irqstatus(bank, offset);
 782         omap_set_gpio_triggering(bank, offset, IRQ_TYPE_NONE);
 783         if (!LINE_USED(bank->mod_usage, offset))
 784                 omap_clear_gpio_debounce(bank, offset);
 785         omap_disable_gpio_module(bank, offset);
 786         raw_spin_unlock_irqrestore(&bank->lock, flags);
 787 }
 788
 789 static void omap_gpio_irq_bus_lock(struct irq_data *data)
 790 {
 791         struct gpio_bank *bank = omap_irq_data_get_bank(data);
 792
 793         if (!BANK_USED(bank))
 794                 pm_runtime_get_sync(bank->chip.parent);
 795 }
 796
 797 static void gpio_irq_bus_sync_unlock(struct irq_data *data)
 798 {
 799         struct gpio_bank *bank = omap_irq_data_get_bank(data);
 800
 801         /*
 802          * If this is the last IRQ to be freed in the bank,
 803          * disable the bank module.
 804          */
 805         if (!BANK_USED(bank))
 806                 pm_runtime_put(bank->chip.parent);
 807 }
 808
 809 static void omap_gpio_ack_irq(struct irq_data *d)
 810 {
 811         struct gpio_bank *bank = omap_irq_data_get_bank(d);
 812         unsigned offset = d->hwirq;
 813
 814         omap_clear_gpio_irqstatus(bank, offset);
 815 }
 816
 817 static void omap_gpio_mask_irq(struct irq_data *d)
 818 {
 819         struct gpio_bank *bank = omap_irq_data_get_bank(d);
 820         unsigned offset = d->hwirq;
 821         unsigned long flags;
 822
 823         raw_spin_lock_irqsave(&bank->lock, flags);
 824         omap_set_gpio_irqenable(bank, offset, 0);
 825         omap_set_gpio_triggering(bank, offset, IRQ_TYPE_NONE);
 826         raw_spin_unlock_irqrestore(&bank->lock, flags);
 827 }
 828
 829 static void omap_gpio_unmask_irq(struct irq_data *d)
 830 {
 831         struct gpio_bank *bank = omap_irq_data_get_bank(d);
 832         unsigned offset = d->hwirq;
 833         u32 trigger = irqd_get_trigger_type(d);
 834         unsigned long flags;
 835
 836         raw_spin_lock_irqsave(&bank->lock, flags);
 837         if (trigger)
 838                 omap_set_gpio_triggering(bank, offset, trigger);
 839
 840         /* For level-triggered GPIOs, the clearing must be done after
 841          * the HW source is cleared, thus after the handler has run */
 842         if (bank->level_mask & BIT(offset)) {
 843                 omap_set_gpio_irqenable(bank, offset, 0);
 844                 omap_clear_gpio_irqstatus(bank, offset);
 845         }
 846
 847         omap_set_gpio_irqenable(bank, offset, 1);
 848         raw_spin_unlock_irqrestore(&bank->lock, flags);
 849 }
 850
 851 /*---------------------------------------------------------------------*/
 852
 853 static int omap_mpuio_suspend_noirq(struct device *dev)
 854 {
 855         struct platform_device *pdev = to_platform_device(dev);
 856         struct gpio_bank        *bank = platform_get_drvdata(pdev);
 857         void __iomem            *mask_reg = bank->base +
 858                                         OMAP_MPUIO_GPIO_MASKIT / bank->stride;
 859         unsigned long           flags;
 860
 861         raw_spin_lock_irqsave(&bank->lock, flags);
 862         writel_relaxed(0xffff & ~bank->context.wake_en, mask_reg);
 863         raw_spin_unlock_irqrestore(&bank->lock, flags);
 864
 865         return 0;
 866 }
 867
 868 static int omap_mpuio_resume_noirq(struct device *dev)
 869 {
 870         struct platform_device *pdev = to_platform_device(dev);
 871         struct gpio_bank        *bank = platform_get_drvdata(pdev);
 872         void __iomem            *mask_reg = bank->base +
 873                                         OMAP_MPUIO_GPIO_MASKIT / bank->stride;
 874         unsigned long           flags;
 875
 876         raw_spin_lock_irqsave(&bank->lock, flags);
 877         writel_relaxed(bank->context.wake_en, mask_reg);
 878         raw_spin_unlock_irqrestore(&bank->lock, flags);
 879
 880         return 0;
 881 }
 882
 883 static const struct dev_pm_ops omap_mpuio_dev_pm_ops = {
 884         .suspend_noirq = omap_mpuio_suspend_noirq,
 885         .resume_noirq = omap_mpuio_resume_noirq,
 886 };
 887
 888 /* use platform_driver for this. */
 889 static struct platform_driver omap_mpuio_driver = {
 890         .driver         = {
 891                 .name   = "mpuio",
 892                 .pm     = &omap_mpuio_dev_pm_ops,
 893         },
 894 };
 895
 896 static struct platform_device omap_mpuio_device = {
 897         .name           = "mpuio",
 898         .id             = -1,
 899         .dev = {
 900                 .driver = &omap_mpuio_driver.driver,
 901         }
 902         /* could list the /proc/iomem resources */
 903 };
 904
 905 static inline void omap_mpuio_init(struct gpio_bank *bank)
 906 {
 907         platform_set_drvdata(&omap_mpuio_device, bank);
 908
 909         if (platform_driver_register(&omap_mpuio_driver) == 0)
 910                 (void) platform_device_register(&omap_mpuio_device);
 911 }
 912
 913 /*---------------------------------------------------------------------*/
 914
 915 static int omap_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
 916 {
 917         struct gpio_bank *bank;
 918         unsigned long flags;
 919         void __iomem *reg;
 920         int dir;
 921
 922         bank = gpiochip_get_data(chip);
 923         reg = bank->base + bank->regs->direction;
 924         raw_spin_lock_irqsave(&bank->lock, flags);
 925         dir = !!(readl_relaxed(reg) & BIT(offset));
 926         raw_spin_unlock_irqrestore(&bank->lock, flags);
 927         return dir;
 928 }
 929
 930 static int omap_gpio_input(struct gpio_chip *chip, unsigned offset)
 931 {
 932         struct gpio_bank *bank;
 933         unsigned long flags;
 934
 935         bank = gpiochip_get_data(chip);
 936         raw_spin_lock_irqsave(&bank->lock, flags);
 937         omap_set_gpio_direction(bank, offset, 1);
 938         raw_spin_unlock_irqrestore(&bank->lock, flags);
 939         return 0;
 940 }
 941
 942 static int omap_gpio_get(struct gpio_chip *chip, unsigned offset)
 943 {
 944         struct gpio_bank *bank;
 945
 946         bank = gpiochip_get_data(chip);
 947
 948         if (omap_gpio_is_input(bank, offset))
 949                 return omap_get_gpio_datain(bank, offset);
 950         else
 951                 return omap_get_gpio_dataout(bank, offset);
 952 }
 953
 954 static int omap_gpio_output(struct gpio_chip *chip, unsigned offset, int value)
 955 {
 956         struct gpio_bank *bank;
 957         unsigned long flags;
 958
 959         bank = gpiochip_get_data(chip);
 960         raw_spin_lock_irqsave(&bank->lock, flags);
 961         bank->set_dataout(bank, offset, value);
 962         omap_set_gpio_direction(bank, offset, 0);
 963         raw_spin_unlock_irqrestore(&bank->lock, flags);
 964         return 0;
 965 }
 966
 967 static int omap_gpio_debounce(struct gpio_chip *chip, unsigned offset,
 968                               unsigned debounce)
 969 {
 970         struct gpio_bank *bank;
 971         unsigned long flags;
 972         int ret;
 973
 974         bank = gpiochip_get_data(chip);
 975
 976         raw_spin_lock_irqsave(&bank->lock, flags);
 977         ret = omap2_set_gpio_debounce(bank, offset, debounce);
 978         raw_spin_unlock_irqrestore(&bank->lock, flags);
 979
 980         if (ret)
 981                 dev_info(chip->parent,
 982                          "Could not set line %u debounce to %u microseconds (%d)",
 983                          offset, debounce, ret);
 984
 985         return ret;
 986 }
 987
 988 static int omap_gpio_set_config(struct gpio_chip *chip, unsigned offset,
 989                                 unsigned long config)
 990 {
 991         u32 debounce;
 992
 993         if (pinconf_to_config_param(config) != PIN_CONFIG_INPUT_DEBOUNCE)
 994                 return -ENOTSUPP;
 995
 996         debounce = pinconf_to_config_argument(config);
 997         return omap_gpio_debounce(chip, offset, debounce);
 998 }
 999
1000 static void omap_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
1001 {
1002         struct gpio_bank *bank;
1003         unsigned long flags;
1004
1005         bank = gpiochip_get_data(chip);
1006         raw_spin_lock_irqsave(&bank->lock, flags);
1007         bank->set_dataout(bank, offset, value);
1008         raw_spin_unlock_irqrestore(&bank->lock, flags);
1009 }
1010
1011 /*---------------------------------------------------------------------*/
1012
1013 static void __init omap_gpio_show_rev(struct gpio_bank *bank)
1014 {
1015         static bool called;
1016         u32 rev;
1017
1018         if (called || bank->regs->revision == USHRT_MAX)
1019                 return;
1020
1021         rev = readw_relaxed(bank->base + bank->regs->revision);
1022         pr_info("OMAP GPIO hardware version %d.%d\n",
1023                 (rev >> 4) & 0x0f, rev & 0x0f);
1024
1025         called = true;
1026 }
1027
1028 static void omap_gpio_mod_init(struct gpio_bank *bank)
1029 {
1030         void __iomem *base = bank->base;
1031         u32 l = 0xffffffff;
1032
1033         if (bank->width == 16)
1034                 l = 0xffff;
1035
1036         if (bank->is_mpuio) {
1037                 writel_relaxed(l, bank->base + bank->regs->irqenable);
1038                 return;
1039         }
1040
1041         omap_gpio_rmw(base, bank->regs->irqenable, l,
1042                       bank->regs->irqenable_inv);
1043         omap_gpio_rmw(base, bank->regs->irqstatus, l,
1044                       !bank->regs->irqenable_inv);
1045         if (bank->regs->debounce_en)
1046                 writel_relaxed(0, base + bank->regs->debounce_en);
1047
1048         /* Save OE default value (0xffffffff) in the context */
1049         bank->context.oe = readl_relaxed(bank->base + bank->regs->direction);
1050          /* Initialize interface clk ungated, module enabled */
1051         if (bank->regs->ctrl)
1052                 writel_relaxed(0, base + bank->regs->ctrl);
1053 }
1054
1055 static int omap_gpio_chip_init(struct gpio_bank *bank, struct irq_chip *irqc)
1056 {
1057         static int gpio;
1058         int irq_base = 0;
1059         int ret;
1060
1061         /*
1062          * REVISIT eventually switch from OMAP-specific gpio structs
1063          * over to the generic ones
1064          */
1065         bank->chip.request = omap_gpio_request;
1066         bank->chip.free = omap_gpio_free;
1067         bank->chip.get_direction = omap_gpio_get_direction;
1068         bank->chip.direction_input = omap_gpio_input;
1069         bank->chip.get = omap_gpio_get;
1070         bank->chip.direction_output = omap_gpio_output;
1071         bank->chip.set_config = omap_gpio_set_config;
1072         bank->chip.set = omap_gpio_set;
1073         if (bank->is_mpuio) {
1074                 bank->chip.label = "mpuio";
1075                 if (bank->regs->wkup_en)
1076                         bank->chip.parent = &omap_mpuio_device.dev;
1077                 bank->chip.base = OMAP_MPUIO(0);
1078         } else {
1079                 bank->chip.label = "gpio";
1080                 bank->chip.base = gpio;
1081         }
1082         bank->chip.ngpio = bank->width;
1083
1084         ret = gpiochip_add_data(&bank->chip, bank);
1085         if (ret) {
1086                 dev_err(bank->chip.parent,
1087                         "Could not register gpio chip %d\n", ret);
1088                 return ret;
1089         }
1090
1091         if (!bank->is_mpuio)
1092                 gpio += bank->width;
1093
1094 #ifdef CONFIG_ARCH_OMAP1
1095         /*
1096          * REVISIT: Once we have OMAP1 supporting SPARSE_IRQ, we can drop
1097          * irq_alloc_descs() since a base IRQ offset will no longer be needed.
1098          */
1099         irq_base = devm_irq_alloc_descs(bank->chip.parent,
1100                                         -1, 0, bank->width, 0);
1101         if (irq_base < 0) {
1102                 dev_err(bank->chip.parent, "Couldn't allocate IRQ numbers\n");
1103                 return -ENODEV;
1104         }
1105 #endif
1106
1107         /* MPUIO is a bit different, reading IRQ status clears it */
1108         if (bank->is_mpuio) {
1109                 irqc->irq_ack = dummy_irq_chip.irq_ack;
1110                 if (!bank->regs->wkup_en)
1111                         irqc->irq_set_wake = NULL;
1112         }
1113
1114         ret = gpiochip_irqchip_add(&bank->chip, irqc,
1115                                    irq_base, handle_bad_irq,
1116                                    IRQ_TYPE_NONE);
1117
1118         if (ret) {
1119                 dev_err(bank->chip.parent,
1120                         "Couldn't add irqchip to gpiochip %d\n", ret);
1121                 gpiochip_remove(&bank->chip);
1122                 return -ENODEV;
1123         }
1124
1125         gpiochip_set_chained_irqchip(&bank->chip, irqc, bank->irq, NULL);
1126
1127         ret = devm_request_irq(bank->chip.parent, bank->irq,
1128                                omap_gpio_irq_handler,
1129                                0, dev_name(bank->chip.parent), bank);
1130         if (ret)
1131                 gpiochip_remove(&bank->chip);
1132
1133         return ret;
1134 }
1135
1136 static const struct of_device_id omap_gpio_match[];
1137
1138 static int omap_gpio_probe(struct platform_device *pdev)
1139 {
1140         struct device *dev = &pdev->dev;
1141         struct device_node *node = dev->of_node;
1142         const struct of_device_id *match;
1143         const struct omap_gpio_platform_data *pdata;
1144         struct resource *res;
1145         struct gpio_bank *bank;
1146         struct irq_chip *irqc;
1147         int ret;
1148
1149         match = of_match_device(of_match_ptr(omap_gpio_match), dev);
1150
1151         pdata = match ? match->data : dev_get_platdata(dev);
1152         if (!pdata)
1153                 return -EINVAL;
1154
1155         bank = devm_kzalloc(dev, sizeof(struct gpio_bank), GFP_KERNEL);
1156         if (!bank) {
1157                 dev_err(dev, "Memory alloc failed\n");
1158                 return -ENOMEM;
1159         }
1160
1161         irqc = devm_kzalloc(dev, sizeof(*irqc), GFP_KERNEL);
1162         if (!irqc)
1163                 return -ENOMEM;
1164
1165         irqc->irq_startup = omap_gpio_irq_startup,
1166         irqc->irq_shutdown = omap_gpio_irq_shutdown,
1167         irqc->irq_ack = omap_gpio_ack_irq,
1168         irqc->irq_mask = omap_gpio_mask_irq,
1169         irqc->irq_unmask = omap_gpio_unmask_irq,
1170         irqc->irq_set_type = omap_gpio_irq_type,
1171         irqc->irq_set_wake = omap_gpio_wake_enable,
1172         irqc->irq_bus_lock = omap_gpio_irq_bus_lock,
1173         irqc->irq_bus_sync_unlock = gpio_irq_bus_sync_unlock,
1174         irqc->name = dev_name(&pdev->dev);
1175         irqc->flags = IRQCHIP_MASK_ON_SUSPEND;
1176
1177         bank->irq = platform_get_irq(pdev, 0);
1178         if (bank->irq <= 0) {
1179                 if (!bank->irq)
1180                         bank->irq = -ENXIO;
1181                 if (bank->irq != -EPROBE_DEFER)
1182                         dev_err(dev,
1183                                 "can't get irq resource ret=%d\n", bank->irq);
1184                 return bank->irq;
1185         }
1186
1187         bank->chip.parent = dev;
1188         bank->chip.owner = THIS_MODULE;
1189         bank->dbck_flag = pdata->dbck_flag;
1190         bank->stride = pdata->bank_stride;
1191         bank->width = pdata->bank_width;
1192         bank->is_mpuio = pdata->is_mpuio;
1193         bank->non_wakeup_gpios = pdata->non_wakeup_gpios;
1194         bank->regs = pdata->regs;
1195 #ifdef CONFIG_OF_GPIO
1196         bank->chip.of_node = of_node_get(node);
1197 #endif
1198         if (node) {
1199                 if (!of_property_read_bool(node, "ti,gpio-always-on"))
1200                         bank->loses_context = true;
1201         } else {
1202                 bank->loses_context = pdata->loses_context;
1203
1204                 if (bank->loses_context)
1205                         bank->get_context_loss_count =
1206                                 pdata->get_context_loss_count;
1207         }
1208
1209         if (bank->regs->set_dataout && bank->regs->clr_dataout)
1210                 bank->set_dataout = omap_set_gpio_dataout_reg;
1211         else
1212                 bank->set_dataout = omap_set_gpio_dataout_mask;
1213
1214         raw_spin_lock_init(&bank->lock);
1215         raw_spin_lock_init(&bank->wa_lock);
1216
1217         /* Static mapping, never released */
1218         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1219         bank->base = devm_ioremap_resource(dev, res);
1220         if (IS_ERR(bank->base)) {
1221                 return PTR_ERR(bank->base);
1222         }
1223
1224         if (bank->dbck_flag) {
1225                 bank->dbck = devm_clk_get(dev, "dbclk");
1226                 if (IS_ERR(bank->dbck)) {
1227                         dev_err(dev,
1228                                 "Could not get gpio dbck. Disable debounce\n");
1229                         bank->dbck_flag = false;
1230                 } else {
1231                         clk_prepare(bank->dbck);
1232                 }
1233         }
1234
1235         platform_set_drvdata(pdev, bank);
1236
1237         pm_runtime_enable(dev);
1238         pm_runtime_irq_safe(dev);
1239         pm_runtime_get_sync(dev);
1240
1241         if (bank->is_mpuio)
1242                 omap_mpuio_init(bank);
1243
1244         omap_gpio_mod_init(bank);
1245
1246         ret = omap_gpio_chip_init(bank, irqc);
1247         if (ret) {
1248                 pm_runtime_put_sync(dev);
1249                 pm_runtime_disable(dev);
1250                 if (bank->dbck_flag)
1251                         clk_unprepare(bank->dbck);
1252                 return ret;
1253         }
1254
1255         omap_gpio_show_rev(bank);
1256
1257         pm_runtime_put(dev);
1258
1259         list_add_tail(&bank->node, &omap_gpio_list);
1260
1261         return 0;
1262 }
1263
1264 static int omap_gpio_remove(struct platform_device *pdev)
1265 {
1266         struct gpio_bank *bank = platform_get_drvdata(pdev);
1267
1268         list_del(&bank->node);
1269         gpiochip_remove(&bank->chip);
1270         pm_runtime_disable(&pdev->dev);
1271         if (bank->dbck_flag)
1272                 clk_unprepare(bank->dbck);
1273
1274         return 0;
1275 }
1276
1277 #ifdef CONFIG_ARCH_OMAP2PLUS
1278
1279 #if defined(CONFIG_PM)
1280 static void omap_gpio_restore_context(struct gpio_bank *bank);
1281
1282 static int omap_gpio_runtime_suspend(struct device *dev)
1283 {
1284         struct platform_device *pdev = to_platform_device(dev);
1285         struct gpio_bank *bank = platform_get_drvdata(pdev);
1286         u32 l1 = 0, l2 = 0;
1287         unsigned long flags;
1288         u32 wake_low, wake_hi;
1289
1290         raw_spin_lock_irqsave(&bank->lock, flags);
1291
1292         /*
1293          * Only edges can generate a wakeup event to the PRCM.
1294          *
1295          * Therefore, ensure any wake-up capable GPIOs have
1296          * edge-detection enabled before going idle to ensure a wakeup
1297          * to the PRCM is generated on a GPIO transition. (c.f. 34xx
1298          * NDA TRM 25.5.3.1)
1299          *
1300          * The normal values will be restored upon ->runtime_resume()
1301          * by writing back the values saved in bank->context.
1302          */
1303         wake_low = bank->context.leveldetect0 & bank->context.wake_en;
1304         if (wake_low)
1305                 writel_relaxed(wake_low | bank->context.fallingdetect,
1306                              bank->base + bank->regs->fallingdetect);
1307         wake_hi = bank->context.leveldetect1 & bank->context.wake_en;
1308         if (wake_hi)
1309                 writel_relaxed(wake_hi | bank->context.risingdetect,
1310                              bank->base + bank->regs->risingdetect);
1311
1312         if (!bank->enabled_non_wakeup_gpios)
1313                 goto update_gpio_context_count;
1314
1315         if (bank->power_mode != OFF_MODE) {
1316                 bank->power_mode = 0;
1317                 goto update_gpio_context_count;
1318         }
1319         /*
1320          * If going to OFF, remove triggering for all
1321          * non-wakeup GPIOs.  Otherwise spurious IRQs will be
1322          * generated.  See OMAP2420 Errata item 1.101.
1323          */
1324         bank->saved_datain = readl_relaxed(bank->base +
1325                                                 bank->regs->datain);
1326         l1 = bank->context.fallingdetect;
1327         l2 = bank->context.risingdetect;
1328
1329         l1 &= ~bank->enabled_non_wakeup_gpios;
1330         l2 &= ~bank->enabled_non_wakeup_gpios;
1331
1332         writel_relaxed(l1, bank->base + bank->regs->fallingdetect);
1333         writel_relaxed(l2, bank->base + bank->regs->risingdetect);
1334
1335         bank->workaround_enabled = true;
1336
1337 update_gpio_context_count:
1338         if (bank->get_context_loss_count)
1339                 bank->context_loss_count =
1340                                 bank->get_context_loss_count(dev);
1341
1342         omap_gpio_dbck_disable(bank);
1343         raw_spin_unlock_irqrestore(&bank->lock, flags);
1344
1345         return 0;
1346 }
1347
1348 static void omap_gpio_init_context(struct gpio_bank *p);
1349
1350 static int omap_gpio_runtime_resume(struct device *dev)
1351 {
1352         struct platform_device *pdev = to_platform_device(dev);
1353         struct gpio_bank *bank = platform_get_drvdata(pdev);
1354         u32 l = 0, gen, gen0, gen1;
1355         unsigned long flags;
1356         int c;
1357
1358         raw_spin_lock_irqsave(&bank->lock, flags);
1359
1360         /*
1361          * On the first resume during the probe, the context has not
1362          * been initialised and so initialise it now. Also initialise
1363          * the context loss count.
1364          */
1365         if (bank->loses_context && !bank->context_valid) {
1366                 omap_gpio_init_context(bank);
1367
1368                 if (bank->get_context_loss_count)
1369                         bank->context_loss_count =
1370                                 bank->get_context_loss_count(dev);
1371         }
1372
1373         omap_gpio_dbck_enable(bank);
1374
1375         /*
1376          * In ->runtime_suspend(), level-triggered, wakeup-enabled
1377          * GPIOs were set to edge trigger also in order to be able to
1378          * generate a PRCM wakeup.  Here we restore the
1379          * pre-runtime_suspend() values for edge triggering.
1380          */
1381         writel_relaxed(bank->context.fallingdetect,
1382                      bank->base + bank->regs->fallingdetect);
1383         writel_relaxed(bank->context.risingdetect,
1384                      bank->base + bank->regs->risingdetect);
1385
1386         if (bank->loses_context) {
1387                 if (!bank->get_context_loss_count) {
1388                         omap_gpio_restore_context(bank);
1389                 } else {
1390                         c = bank->get_context_loss_count(dev);
1391                         if (c != bank->context_loss_count) {
1392                                 omap_gpio_restore_context(bank);
1393                         } else {
1394                                 raw_spin_unlock_irqrestore(&bank->lock, flags);
1395                                 return 0;
1396                         }
1397                 }
1398         }
1399
1400         if (!bank->workaround_enabled) {
1401                 raw_spin_unlock_irqrestore(&bank->lock, flags);
1402                 return 0;
1403         }
1404
1405         l = readl_relaxed(bank->base + bank->regs->datain);
1406
1407         /*
1408          * Check if any of the non-wakeup interrupt GPIOs have changed
1409          * state.  If so, generate an IRQ by software.  This is
1410          * horribly racy, but it's the best we can do to work around
1411          * this silicon bug.
1412          */
1413         l ^= bank->saved_datain;
1414         l &= bank->enabled_non_wakeup_gpios;
1415
1416         /*
1417          * No need to generate IRQs for the rising edge for gpio IRQs
1418          * configured with falling edge only; and vice versa.
1419          */
1420         gen0 = l & bank->context.fallingdetect;
1421         gen0 &= bank->saved_datain;
1422
1423         gen1 = l & bank->context.risingdetect;
1424         gen1 &= ~(bank->saved_datain);
1425
1426         /* FIXME: Consider GPIO IRQs with level detections properly! */
1427         gen = l & (~(bank->context.fallingdetect) &
1428                                          ~(bank->context.risingdetect));
1429         /* Consider all GPIO IRQs needed to be updated */
1430         gen |= gen0 | gen1;
1431
1432         if (gen) {
1433                 u32 old0, old1;
1434
1435                 old0 = readl_relaxed(bank->base + bank->regs->leveldetect0);
1436                 old1 = readl_relaxed(bank->base + bank->regs->leveldetect1);
1437
1438                 if (!bank->regs->irqstatus_raw0) {
1439                         writel_relaxed(old0 | gen, bank->base +
1440                                                 bank->regs->leveldetect0);
1441                         writel_relaxed(old1 | gen, bank->base +
1442                                                 bank->regs->leveldetect1);
1443                 }
1444
1445                 if (bank->regs->irqstatus_raw0) {
1446                         writel_relaxed(old0 | l, bank->base +
1447                                                 bank->regs->leveldetect0);
1448                         writel_relaxed(old1 | l, bank->base +
1449                                                 bank->regs->leveldetect1);
1450                 }
1451                 writel_relaxed(old0, bank->base + bank->regs->leveldetect0);
1452                 writel_relaxed(old1, bank->base + bank->regs->leveldetect1);
1453         }
1454
1455         bank->workaround_enabled = false;
1456         raw_spin_unlock_irqrestore(&bank->lock, flags);
1457
1458         return 0;
1459 }
1460 #endif /* CONFIG_PM */
1461
1462 #if IS_BUILTIN(CONFIG_GPIO_OMAP)
1463 void omap2_gpio_prepare_for_idle(int pwr_mode)
1464 {
1465         struct gpio_bank *bank;
1466
1467         list_for_each_entry(bank, &omap_gpio_list, node) {
1468                 if (!BANK_USED(bank) || !bank->loses_context)
1469                         continue;
1470
1471                 bank->power_mode = pwr_mode;
1472
1473                 pm_runtime_put_sync_suspend(bank->chip.parent);
1474         }
1475 }
1476
1477 void omap2_gpio_resume_after_idle(void)
1478 {
1479         struct gpio_bank *bank;
1480
1481         list_for_each_entry(bank, &omap_gpio_list, node) {
1482                 if (!BANK_USED(bank) || !bank->loses_context)
1483                         continue;
1484
1485                 pm_runtime_get_sync(bank->chip.parent);
1486         }
1487 }
1488 #endif
1489
1490 #if defined(CONFIG_PM)
1491 static void omap_gpio_init_context(struct gpio_bank *p)
1492 {
1493         struct omap_gpio_reg_offs *regs = p->regs;
1494         void __iomem *base = p->base;
1495
1496         p->context.ctrl         = readl_relaxed(base + regs->ctrl);
1497         p->context.oe           = readl_relaxed(base + regs->direction);
1498         p->context.wake_en      = readl_relaxed(base + regs->wkup_en);
1499         p->context.leveldetect0 = readl_relaxed(base + regs->leveldetect0);
1500         p->context.leveldetect1 = readl_relaxed(base + regs->leveldetect1);
1501         p->context.risingdetect = readl_relaxed(base + regs->risingdetect);
1502         p->context.fallingdetect = readl_relaxed(base + regs->fallingdetect);
1503         p->context.irqenable1   = readl_relaxed(base + regs->irqenable);
1504         p->context.irqenable2   = readl_relaxed(base + regs->irqenable2);
1505
1506         if (regs->set_dataout && p->regs->clr_dataout)
1507                 p->context.dataout = readl_relaxed(base + regs->set_dataout);
1508         else
1509                 p->context.dataout = readl_relaxed(base + regs->dataout);
1510
1511         p->context_valid = true;
1512 }
1513
1514 static void omap_gpio_restore_context(struct gpio_bank *bank)
1515 {
1516         writel_relaxed(bank->context.wake_en,
1517                                 bank->base + bank->regs->wkup_en);
1518         writel_relaxed(bank->context.ctrl, bank->base + bank->regs->ctrl);
1519         writel_relaxed(bank->context.leveldetect0,
1520                                 bank->base + bank->regs->leveldetect0);
1521         writel_relaxed(bank->context.leveldetect1,
1522                                 bank->base + bank->regs->leveldetect1);
1523         writel_relaxed(bank->context.risingdetect,
1524                                 bank->base + bank->regs->risingdetect);
1525         writel_relaxed(bank->context.fallingdetect,
1526                                 bank->base + bank->regs->fallingdetect);
1527         if (bank->regs->set_dataout && bank->regs->clr_dataout)
1528                 writel_relaxed(bank->context.dataout,
1529                                 bank->base + bank->regs->set_dataout);
1530         else
1531                 writel_relaxed(bank->context.dataout,
1532                                 bank->base + bank->regs->dataout);
1533         writel_relaxed(bank->context.oe, bank->base + bank->regs->direction);
1534
1535         if (bank->dbck_enable_mask) {
1536                 writel_relaxed(bank->context.debounce, bank->base +
1537                                         bank->regs->debounce);
1538                 writel_relaxed(bank->context.debounce_en,
1539                                         bank->base + bank->regs->debounce_en);
1540         }
1541
1542         writel_relaxed(bank->context.irqenable1,
1543                                 bank->base + bank->regs->irqenable);
1544         writel_relaxed(bank->context.irqenable2,
1545                                 bank->base + bank->regs->irqenable2);
1546 }
1547 #endif /* CONFIG_PM */
1548 #else
1549 #define omap_gpio_runtime_suspend NULL
1550 #define omap_gpio_runtime_resume NULL
1551 static inline void omap_gpio_init_context(struct gpio_bank *p) {}
1552 #endif
1553
1554 static const struct dev_pm_ops gpio_pm_ops = {
1555         SET_RUNTIME_PM_OPS(omap_gpio_runtime_suspend, omap_gpio_runtime_resume,
1556                                                                         NULL)
1557 };
1558
1559 #if defined(CONFIG_OF)
1560 static struct omap_gpio_reg_offs omap2_gpio_regs = {
1561         .revision =             OMAP24XX_GPIO_REVISION,
1562         .direction =            OMAP24XX_GPIO_OE,
1563         .datain =               OMAP24XX_GPIO_DATAIN,
1564         .dataout =              OMAP24XX_GPIO_DATAOUT,
1565         .set_dataout =          OMAP24XX_GPIO_SETDATAOUT,
1566         .clr_dataout =          OMAP24XX_GPIO_CLEARDATAOUT,
1567         .irqstatus =            OMAP24XX_GPIO_IRQSTATUS1,
1568         .irqstatus2 =           OMAP24XX_GPIO_IRQSTATUS2,
1569         .irqenable =            OMAP24XX_GPIO_IRQENABLE1,
1570         .irqenable2 =           OMAP24XX_GPIO_IRQENABLE2,
1571         .set_irqenable =        OMAP24XX_GPIO_SETIRQENABLE1,
1572         .clr_irqenable =        OMAP24XX_GPIO_CLEARIRQENABLE1,
1573         .debounce =             OMAP24XX_GPIO_DEBOUNCE_VAL,
1574         .debounce_en =          OMAP24XX_GPIO_DEBOUNCE_EN,
1575         .ctrl =                 OMAP24XX_GPIO_CTRL,
1576         .wkup_en =              OMAP24XX_GPIO_WAKE_EN,
1577         .leveldetect0 =         OMAP24XX_GPIO_LEVELDETECT0,
1578         .leveldetect1 =         OMAP24XX_GPIO_LEVELDETECT1,
1579         .risingdetect =         OMAP24XX_GPIO_RISINGDETECT,
1580         .fallingdetect =        OMAP24XX_GPIO_FALLINGDETECT,
1581 };
1582
1583 static struct omap_gpio_reg_offs omap4_gpio_regs = {
1584         .revision =             OMAP4_GPIO_REVISION,
1585         .direction =            OMAP4_GPIO_OE,
1586         .datain =               OMAP4_GPIO_DATAIN,
1587         .dataout =              OMAP4_GPIO_DATAOUT,
1588         .set_dataout =          OMAP4_GPIO_SETDATAOUT,
1589         .clr_dataout =          OMAP4_GPIO_CLEARDATAOUT,
1590         .irqstatus =            OMAP4_GPIO_IRQSTATUS0,
1591         .irqstatus2 =           OMAP4_GPIO_IRQSTATUS1,
1592         .irqenable =            OMAP4_GPIO_IRQSTATUSSET0,
1593         .irqenable2 =           OMAP4_GPIO_IRQSTATUSSET1,
1594         .set_irqenable =        OMAP4_GPIO_IRQSTATUSSET0,
1595         .clr_irqenable =        OMAP4_GPIO_IRQSTATUSCLR0,
1596         .debounce =             OMAP4_GPIO_DEBOUNCINGTIME,
1597         .debounce_en =          OMAP4_GPIO_DEBOUNCENABLE,
1598         .ctrl =                 OMAP4_GPIO_CTRL,
1599         .wkup_en =              OMAP4_GPIO_IRQWAKEN0,
1600         .leveldetect0 =         OMAP4_GPIO_LEVELDETECT0,
1601         .leveldetect1 =         OMAP4_GPIO_LEVELDETECT1,
1602         .risingdetect =         OMAP4_GPIO_RISINGDETECT,
1603         .fallingdetect =        OMAP4_GPIO_FALLINGDETECT,
1604 };
1605
1606 static const struct omap_gpio_platform_data omap2_pdata = {
1607         .regs = &omap2_gpio_regs,
1608         .bank_width = 32,
1609         .dbck_flag = false,
1610 };
1611
1612 static const struct omap_gpio_platform_data omap3_pdata = {
1613         .regs = &omap2_gpio_regs,
1614         .bank_width = 32,
1615         .dbck_flag = true,
1616 };
1617
1618 static const struct omap_gpio_platform_data omap4_pdata = {
1619         .regs = &omap4_gpio_regs,
1620         .bank_width = 32,
1621         .dbck_flag = true,
1622 };
1623
1624 static const struct of_device_id omap_gpio_match[] = {
1625         {
1626                 .compatible = "ti,omap4-gpio",
1627                 .data = &omap4_pdata,
1628         },
1629         {
1630                 .compatible = "ti,omap3-gpio",
1631                 .data = &omap3_pdata,
1632         },
1633         {
1634                 .compatible = "ti,omap2-gpio",
1635                 .data = &omap2_pdata,
1636         },
1637         { },
1638 };
1639 MODULE_DEVICE_TABLE(of, omap_gpio_match);
1640 #endif
1641
1642 static struct platform_driver omap_gpio_driver = {
1643         .probe          = omap_gpio_probe,
1644         .remove         = omap_gpio_remove,
1645         .driver         = {
1646                 .name   = "omap_gpio",
1647                 .pm     = &gpio_pm_ops,
1648                 .of_match_table = of_match_ptr(omap_gpio_match),
1649         },
1650 };
1651
1652 /*
1653  * gpio driver register needs to be done before
1654  * machine_init functions access gpio APIs.
1655  * Hence omap_gpio_drv_reg() is a postcore_initcall.
1656  */
1657 static int __init omap_gpio_drv_reg(void)
1658 {
1659         return platform_driver_register(&omap_gpio_driver);
1660 }
1661 postcore_initcall(omap_gpio_drv_reg);
1662
1663 static void __exit omap_gpio_exit(void)
1664 {
1665         platform_driver_unregister(&omap_gpio_driver);
1666 }
1667 module_exit(omap_gpio_exit);
1668
1669 MODULE_DESCRIPTION("omap gpio driver");
1670 MODULE_ALIAS("platform:gpio-omap");
1671 MODULE_LICENSE("GPL v2");