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/cpu_pm.h>
  23 #include <linux/device.h>
  24 #include <linux/pm_runtime.h>
  25 #include <linux/pm.h>
  26 #include <linux/of.h>
  27 #include <linux/of_device.h>
  28 #include <linux/gpio/driver.h>
  29 #include <linux/bitops.h>
  30 #include <linux/platform_data/gpio-omap.h>
  31
  32 #define OMAP4_GPIO_DEBOUNCINGTIME_MASK 0xFF
  33
  34 struct gpio_regs {
  35         u32 irqenable1;
  36         u32 irqenable2;
  37         u32 wake_en;
  38         u32 ctrl;
  39         u32 oe;
  40         u32 leveldetect0;
  41         u32 leveldetect1;
  42         u32 risingdetect;
  43         u32 fallingdetect;
  44         u32 dataout;
  45         u32 debounce;
  46         u32 debounce_en;
  47 };
  48
  49 struct gpio_bank {
  50         struct list_head node;
  51         void __iomem *base;
  52         int irq;
  53         u32 non_wakeup_gpios;
  54         u32 enabled_non_wakeup_gpios;
  55         struct gpio_regs context;
  56         u32 saved_datain;
  57         u32 level_mask;
  58         u32 toggle_mask;
  59         raw_spinlock_t lock;
  60         raw_spinlock_t wa_lock;
  61         struct gpio_chip chip;
  62         struct clk *dbck;
  63         struct notifier_block nb;
  64         unsigned int is_suspended:1;
  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
  77         void (*set_dataout)(struct gpio_bank *bank, unsigned gpio, int enable);
  78         void (*set_dataout_multiple)(struct gpio_bank *bank,
  79                                      unsigned long *mask, unsigned long *bits);
  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 /* set multiple data out values using dedicate set/clear register */
 165 static void omap_set_gpio_dataout_reg_multiple(struct gpio_bank *bank,
 166                                                unsigned long *mask,
 167                                                unsigned long *bits)
 168 {
 169         void __iomem *reg = bank->base;
 170         u32 l;
 171
 172         l = *bits & *mask;
 173         writel_relaxed(l, reg + bank->regs->set_dataout);
 174         bank->context.dataout |= l;
 175
 176         l = ~*bits & *mask;
 177         writel_relaxed(l, reg + bank->regs->clr_dataout);
 178         bank->context.dataout &= ~l;
 179 }
 180
 181 /* set multiple data out values using mask register */
 182 static void omap_set_gpio_dataout_mask_multiple(struct gpio_bank *bank,
 183                                                 unsigned long *mask,
 184                                                 unsigned long *bits)
 185 {
 186         void __iomem *reg = bank->base + bank->regs->dataout;
 187         u32 l = (readl_relaxed(reg) & ~*mask) | (*bits & *mask);
 188
 189         writel_relaxed(l, reg);
 190         bank->context.dataout = l;
 191 }
 192
 193 static unsigned long omap_get_gpio_datain_multiple(struct gpio_bank *bank,
 194                                               unsigned long *mask)
 195 {
 196         void __iomem *reg = bank->base + bank->regs->datain;
 197
 198         return readl_relaxed(reg) & *mask;
 199 }
 200
 201 static unsigned long omap_get_gpio_dataout_multiple(struct gpio_bank *bank,
 202                                                unsigned long *mask)
 203 {
 204         void __iomem *reg = bank->base + bank->regs->dataout;
 205
 206         return readl_relaxed(reg) & *mask;
 207 }
 208
 209 static inline void omap_gpio_rmw(void __iomem *base, u32 reg, u32 mask, bool set)
 210 {
 211         int l = readl_relaxed(base + reg);
 212
 213         if (set)
 214                 l |= mask;
 215         else
 216                 l &= ~mask;
 217
 218         writel_relaxed(l, base + reg);
 219 }
 220
 221 static inline void omap_gpio_dbck_enable(struct gpio_bank *bank)
 222 {
 223         if (bank->dbck_enable_mask && !bank->dbck_enabled) {
 224                 clk_enable(bank->dbck);
 225                 bank->dbck_enabled = true;
 226
 227                 writel_relaxed(bank->dbck_enable_mask,
 228                              bank->base + bank->regs->debounce_en);
 229         }
 230 }
 231
 232 static inline void omap_gpio_dbck_disable(struct gpio_bank *bank)
 233 {
 234         if (bank->dbck_enable_mask && bank->dbck_enabled) {
 235                 /*
 236                  * Disable debounce before cutting it's clock. If debounce is
 237                  * enabled but the clock is not, GPIO module seems to be unable
 238                  * to detect events and generate interrupts at least on OMAP3.
 239                  */
 240                 writel_relaxed(0, bank->base + bank->regs->debounce_en);
 241
 242                 clk_disable(bank->dbck);
 243                 bank->dbck_enabled = false;
 244         }
 245 }
 246
 247 /**
 248  * omap2_set_gpio_debounce - low level gpio debounce time
 249  * @bank: the gpio bank we're acting upon
 250  * @offset: the gpio number on this @bank
 251  * @debounce: debounce time to use
 252  *
 253  * OMAP's debounce time is in 31us steps
 254  *   <debounce time> = (GPIO_DEBOUNCINGTIME[7:0].DEBOUNCETIME + 1) x 31
 255  * so we need to convert and round up to the closest unit.
 256  *
 257  * Return: 0 on success, negative error otherwise.
 258  */
 259 static int omap2_set_gpio_debounce(struct gpio_bank *bank, unsigned offset,
 260                                    unsigned debounce)
 261 {
 262         void __iomem            *reg;
 263         u32                     val;
 264         u32                     l;
 265         bool                    enable = !!debounce;
 266
 267         if (!bank->dbck_flag)
 268                 return -ENOTSUPP;
 269
 270         if (enable) {
 271                 debounce = DIV_ROUND_UP(debounce, 31) - 1;
 272                 if ((debounce & OMAP4_GPIO_DEBOUNCINGTIME_MASK) != debounce)
 273                         return -EINVAL;
 274         }
 275
 276         l = BIT(offset);
 277
 278         clk_enable(bank->dbck);
 279         reg = bank->base + bank->regs->debounce;
 280         writel_relaxed(debounce, reg);
 281
 282         reg = bank->base + bank->regs->debounce_en;
 283         val = readl_relaxed(reg);
 284
 285         if (enable)
 286                 val |= l;
 287         else
 288                 val &= ~l;
 289         bank->dbck_enable_mask = val;
 290
 291         writel_relaxed(val, reg);
 292         clk_disable(bank->dbck);
 293         /*
 294          * Enable debounce clock per module.
 295          * This call is mandatory because in omap_gpio_request() when
 296          * *_runtime_get_sync() is called,  _gpio_dbck_enable() within
 297          * runtime callbck fails to turn on dbck because dbck_enable_mask
 298          * used within _gpio_dbck_enable() is still not initialized at
 299          * that point. Therefore we have to enable dbck here.
 300          */
 301         omap_gpio_dbck_enable(bank);
 302         if (bank->dbck_enable_mask) {
 303                 bank->context.debounce = debounce;
 304                 bank->context.debounce_en = val;
 305         }
 306
 307         return 0;
 308 }
 309
 310 /**
 311  * omap_clear_gpio_debounce - clear debounce settings for a gpio
 312  * @bank: the gpio bank we're acting upon
 313  * @offset: the gpio number on this @bank
 314  *
 315  * If a gpio is using debounce, then clear the debounce enable bit and if
 316  * this is the only gpio in this bank using debounce, then clear the debounce
 317  * time too. The debounce clock will also be disabled when calling this function
 318  * if this is the only gpio in the bank using debounce.
 319  */
 320 static void omap_clear_gpio_debounce(struct gpio_bank *bank, unsigned offset)
 321 {
 322         u32 gpio_bit = BIT(offset);
 323
 324         if (!bank->dbck_flag)
 325                 return;
 326
 327         if (!(bank->dbck_enable_mask & gpio_bit))
 328                 return;
 329
 330         bank->dbck_enable_mask &= ~gpio_bit;
 331         bank->context.debounce_en &= ~gpio_bit;
 332         writel_relaxed(bank->context.debounce_en,
 333                      bank->base + bank->regs->debounce_en);
 334
 335         if (!bank->dbck_enable_mask) {
 336                 bank->context.debounce = 0;
 337                 writel_relaxed(bank->context.debounce, bank->base +
 338                              bank->regs->debounce);
 339                 clk_disable(bank->dbck);
 340                 bank->dbck_enabled = false;
 341         }
 342 }
 343
 344 /*
 345  * Off mode wake-up capable GPIOs in bank(s) that are in the wakeup domain.
 346  * See TRM section for GPIO for "Wake-Up Generation" for the list of GPIOs
 347  * in wakeup domain. If bank->non_wakeup_gpios is not configured, assume none
 348  * are capable waking up the system from off mode.
 349  */
 350 static bool omap_gpio_is_off_wakeup_capable(struct gpio_bank *bank, u32 gpio_mask)
 351 {
 352         u32 no_wake = bank->non_wakeup_gpios;
 353
 354         if (no_wake)
 355                 return !!(~no_wake & gpio_mask);
 356
 357         return false;
 358 }
 359
 360 static inline void omap_set_gpio_trigger(struct gpio_bank *bank, int gpio,
 361                                                 unsigned trigger)
 362 {
 363         void __iomem *base = bank->base;
 364         u32 gpio_bit = BIT(gpio);
 365
 366         omap_gpio_rmw(base, bank->regs->leveldetect0, gpio_bit,
 367                       trigger & IRQ_TYPE_LEVEL_LOW);
 368         omap_gpio_rmw(base, bank->regs->leveldetect1, gpio_bit,
 369                       trigger & IRQ_TYPE_LEVEL_HIGH);
 370
 371         /*
 372          * We need the edge detection enabled for to allow the GPIO block
 373          * to be woken from idle state.  Set the appropriate edge detection
 374          * in addition to the level detection.
 375          */
 376         omap_gpio_rmw(base, bank->regs->risingdetect, gpio_bit,
 377                       trigger & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_LEVEL_HIGH));
 378         omap_gpio_rmw(base, bank->regs->fallingdetect, gpio_bit,
 379                       trigger & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_LEVEL_LOW));
 380
 381         bank->context.leveldetect0 =
 382                         readl_relaxed(bank->base + bank->regs->leveldetect0);
 383         bank->context.leveldetect1 =
 384                         readl_relaxed(bank->base + bank->regs->leveldetect1);
 385         bank->context.risingdetect =
 386                         readl_relaxed(bank->base + bank->regs->risingdetect);
 387         bank->context.fallingdetect =
 388                         readl_relaxed(bank->base + bank->regs->fallingdetect);
 389
 390         if (likely(!(bank->non_wakeup_gpios & gpio_bit))) {
 391                 omap_gpio_rmw(base, bank->regs->wkup_en, gpio_bit, trigger != 0);
 392                 bank->context.wake_en =
 393                         readl_relaxed(bank->base + bank->regs->wkup_en);
 394         }
 395
 396         /* This part needs to be executed always for OMAP{34xx, 44xx} */
 397         if (!bank->regs->irqctrl && !omap_gpio_is_off_wakeup_capable(bank, gpio)) {
 398                 /*
 399                  * Log the edge gpio and manually trigger the IRQ
 400                  * after resume if the input level changes
 401                  * to avoid irq lost during PER RET/OFF mode
 402                  * Applies for omap2 non-wakeup gpio and all omap3 gpios
 403                  */
 404                 if (trigger & IRQ_TYPE_EDGE_BOTH)
 405                         bank->enabled_non_wakeup_gpios |= gpio_bit;
 406                 else
 407                         bank->enabled_non_wakeup_gpios &= ~gpio_bit;
 408         }
 409
 410         bank->level_mask =
 411                 readl_relaxed(bank->base + bank->regs->leveldetect0) |
 412                 readl_relaxed(bank->base + bank->regs->leveldetect1);
 413 }
 414
 415 #ifdef CONFIG_ARCH_OMAP1
 416 /*
 417  * This only applies to chips that can't do both rising and falling edge
 418  * detection at once.  For all other chips, this function is a noop.
 419  */
 420 static void omap_toggle_gpio_edge_triggering(struct gpio_bank *bank, int gpio)
 421 {
 422         void __iomem *reg = bank->base;
 423         u32 l = 0;
 424
 425         if (!bank->regs->irqctrl)
 426                 return;
 427
 428         reg += bank->regs->irqctrl;
 429
 430         l = readl_relaxed(reg);
 431         if ((l >> gpio) & 1)
 432                 l &= ~(BIT(gpio));
 433         else
 434                 l |= BIT(gpio);
 435
 436         writel_relaxed(l, reg);
 437 }
 438 #else
 439 static void omap_toggle_gpio_edge_triggering(struct gpio_bank *bank, int gpio) {}
 440 #endif
 441
 442 static int omap_set_gpio_triggering(struct gpio_bank *bank, int gpio,
 443                                     unsigned trigger)
 444 {
 445         void __iomem *reg = bank->base;
 446         void __iomem *base = bank->base;
 447         u32 l = 0;
 448
 449         if (bank->regs->leveldetect0 && bank->regs->wkup_en) {
 450                 omap_set_gpio_trigger(bank, gpio, trigger);
 451         } else if (bank->regs->irqctrl) {
 452                 reg += bank->regs->irqctrl;
 453
 454                 l = readl_relaxed(reg);
 455                 if ((trigger & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH)
 456                         bank->toggle_mask |= BIT(gpio);
 457                 if (trigger & IRQ_TYPE_EDGE_RISING)
 458                         l |= BIT(gpio);
 459                 else if (trigger & IRQ_TYPE_EDGE_FALLING)
 460                         l &= ~(BIT(gpio));
 461                 else
 462                         return -EINVAL;
 463
 464                 writel_relaxed(l, reg);
 465         } else if (bank->regs->edgectrl1) {
 466                 if (gpio & 0x08)
 467                         reg += bank->regs->edgectrl2;
 468                 else
 469                         reg += bank->regs->edgectrl1;
 470
 471                 gpio &= 0x07;
 472                 l = readl_relaxed(reg);
 473                 l &= ~(3 << (gpio << 1));
 474                 if (trigger & IRQ_TYPE_EDGE_RISING)
 475                         l |= 2 << (gpio << 1);
 476                 if (trigger & IRQ_TYPE_EDGE_FALLING)
 477                         l |= BIT(gpio << 1);
 478
 479                 /* Enable wake-up during idle for dynamic tick */
 480                 omap_gpio_rmw(base, bank->regs->wkup_en, BIT(gpio), trigger);
 481                 bank->context.wake_en =
 482                         readl_relaxed(bank->base + bank->regs->wkup_en);
 483                 writel_relaxed(l, reg);
 484         }
 485         return 0;
 486 }
 487
 488 static void omap_enable_gpio_module(struct gpio_bank *bank, unsigned offset)
 489 {
 490         if (bank->regs->pinctrl) {
 491                 void __iomem *reg = bank->base + bank->regs->pinctrl;
 492
 493                 /* Claim the pin for MPU */
 494                 writel_relaxed(readl_relaxed(reg) | (BIT(offset)), reg);
 495         }
 496
 497         if (bank->regs->ctrl && !BANK_USED(bank)) {
 498                 void __iomem *reg = bank->base + bank->regs->ctrl;
 499                 u32 ctrl;
 500
 501                 ctrl = readl_relaxed(reg);
 502                 /* Module is enabled, clocks are not gated */
 503                 ctrl &= ~GPIO_MOD_CTRL_BIT;
 504                 writel_relaxed(ctrl, reg);
 505                 bank->context.ctrl = ctrl;
 506         }
 507 }
 508
 509 static void omap_disable_gpio_module(struct gpio_bank *bank, unsigned offset)
 510 {
 511         void __iomem *base = bank->base;
 512
 513         if (bank->regs->wkup_en &&
 514             !LINE_USED(bank->mod_usage, offset) &&
 515             !LINE_USED(bank->irq_usage, offset)) {
 516                 /* Disable wake-up during idle for dynamic tick */
 517                 omap_gpio_rmw(base, bank->regs->wkup_en, BIT(offset), 0);
 518                 bank->context.wake_en =
 519                         readl_relaxed(bank->base + bank->regs->wkup_en);
 520         }
 521
 522         if (bank->regs->ctrl && !BANK_USED(bank)) {
 523                 void __iomem *reg = bank->base + bank->regs->ctrl;
 524                 u32 ctrl;
 525
 526                 ctrl = readl_relaxed(reg);
 527                 /* Module is disabled, clocks are gated */
 528                 ctrl |= GPIO_MOD_CTRL_BIT;
 529                 writel_relaxed(ctrl, reg);
 530                 bank->context.ctrl = ctrl;
 531         }
 532 }
 533
 534 static int omap_gpio_is_input(struct gpio_bank *bank, unsigned offset)
 535 {
 536         void __iomem *reg = bank->base + bank->regs->direction;
 537
 538         return readl_relaxed(reg) & BIT(offset);
 539 }
 540
 541 static void omap_gpio_init_irq(struct gpio_bank *bank, unsigned offset)
 542 {
 543         if (!LINE_USED(bank->mod_usage, offset)) {
 544                 omap_enable_gpio_module(bank, offset);
 545                 omap_set_gpio_direction(bank, offset, 1);
 546         }
 547         bank->irq_usage |= BIT(offset);
 548 }
 549
 550 static int omap_gpio_irq_type(struct irq_data *d, unsigned type)
 551 {
 552         struct gpio_bank *bank = omap_irq_data_get_bank(d);
 553         int retval;
 554         unsigned long flags;
 555         unsigned offset = d->hwirq;
 556
 557         if (type & ~IRQ_TYPE_SENSE_MASK)
 558                 return -EINVAL;
 559
 560         if (!bank->regs->leveldetect0 &&
 561                 (type & (IRQ_TYPE_LEVEL_LOW|IRQ_TYPE_LEVEL_HIGH)))
 562                 return -EINVAL;
 563
 564         raw_spin_lock_irqsave(&bank->lock, flags);
 565         retval = omap_set_gpio_triggering(bank, offset, type);
 566         if (retval) {
 567                 raw_spin_unlock_irqrestore(&bank->lock, flags);
 568                 goto error;
 569         }
 570         omap_gpio_init_irq(bank, offset);
 571         if (!omap_gpio_is_input(bank, offset)) {
 572                 raw_spin_unlock_irqrestore(&bank->lock, flags);
 573                 retval = -EINVAL;
 574                 goto error;
 575         }
 576         raw_spin_unlock_irqrestore(&bank->lock, flags);
 577
 578         if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
 579                 irq_set_handler_locked(d, handle_level_irq);
 580         else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
 581                 /*
 582                  * Edge IRQs are already cleared/acked in irq_handler and
 583                  * not need to be masked, as result handle_edge_irq()
 584                  * logic is excessed here and may cause lose of interrupts.
 585                  * So just use handle_simple_irq.
 586                  */
 587                 irq_set_handler_locked(d, handle_simple_irq);
 588
 589         return 0;
 590
 591 error:
 592         return retval;
 593 }
 594
 595 static void omap_clear_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
 596 {
 597         void __iomem *reg = bank->base;
 598
 599         reg += bank->regs->irqstatus;
 600         writel_relaxed(gpio_mask, reg);
 601
 602         /* Workaround for clearing DSP GPIO interrupts to allow retention */
 603         if (bank->regs->irqstatus2) {
 604                 reg = bank->base + bank->regs->irqstatus2;
 605                 writel_relaxed(gpio_mask, reg);
 606         }
 607
 608         /* Flush posted write for the irq status to avoid spurious interrupts */
 609         readl_relaxed(reg);
 610 }
 611
 612 static inline void omap_clear_gpio_irqstatus(struct gpio_bank *bank,
 613                                              unsigned offset)
 614 {
 615         omap_clear_gpio_irqbank(bank, BIT(offset));
 616 }
 617
 618 static u32 omap_get_gpio_irqbank_mask(struct gpio_bank *bank)
 619 {
 620         void __iomem *reg = bank->base;
 621         u32 l;
 622         u32 mask = (BIT(bank->width)) - 1;
 623
 624         reg += bank->regs->irqenable;
 625         l = readl_relaxed(reg);
 626         if (bank->regs->irqenable_inv)
 627                 l = ~l;
 628         l &= mask;
 629         return l;
 630 }
 631
 632 static void omap_enable_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
 633 {
 634         void __iomem *reg = bank->base;
 635         u32 l;
 636
 637         if (bank->regs->set_irqenable) {
 638                 reg += bank->regs->set_irqenable;
 639                 l = gpio_mask;
 640                 bank->context.irqenable1 |= gpio_mask;
 641         } else {
 642                 reg += bank->regs->irqenable;
 643                 l = readl_relaxed(reg);
 644                 if (bank->regs->irqenable_inv)
 645                         l &= ~gpio_mask;
 646                 else
 647                         l |= gpio_mask;
 648                 bank->context.irqenable1 = l;
 649         }
 650
 651         writel_relaxed(l, reg);
 652 }
 653
 654 static void omap_disable_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
 655 {
 656         void __iomem *reg = bank->base;
 657         u32 l;
 658
 659         if (bank->regs->clr_irqenable) {
 660                 reg += bank->regs->clr_irqenable;
 661                 l = gpio_mask;
 662                 bank->context.irqenable1 &= ~gpio_mask;
 663         } else {
 664                 reg += bank->regs->irqenable;
 665                 l = readl_relaxed(reg);
 666                 if (bank->regs->irqenable_inv)
 667                         l |= gpio_mask;
 668                 else
 669                         l &= ~gpio_mask;
 670                 bank->context.irqenable1 = l;
 671         }
 672
 673         writel_relaxed(l, reg);
 674 }
 675
 676 static inline void omap_set_gpio_irqenable(struct gpio_bank *bank,
 677                                            unsigned offset, int enable)
 678 {
 679         if (enable)
 680                 omap_enable_gpio_irqbank(bank, BIT(offset));
 681         else
 682                 omap_disable_gpio_irqbank(bank, BIT(offset));
 683 }
 684
 685 /* Use disable_irq_wake() and enable_irq_wake() functions from drivers */
 686 static int omap_gpio_wake_enable(struct irq_data *d, unsigned int enable)
 687 {
 688         struct gpio_bank *bank = omap_irq_data_get_bank(d);
 689
 690         return irq_set_irq_wake(bank->irq, enable);
 691 }
 692
 693 static int omap_gpio_request(struct gpio_chip *chip, unsigned offset)
 694 {
 695         struct gpio_bank *bank = gpiochip_get_data(chip);
 696         unsigned long flags;
 697
 698         pm_runtime_get_sync(chip->parent);
 699
 700         raw_spin_lock_irqsave(&bank->lock, flags);
 701         omap_enable_gpio_module(bank, offset);
 702         bank->mod_usage |= BIT(offset);
 703         raw_spin_unlock_irqrestore(&bank->lock, flags);
 704
 705         return 0;
 706 }
 707
 708 static void omap_gpio_free(struct gpio_chip *chip, unsigned offset)
 709 {
 710         struct gpio_bank *bank = gpiochip_get_data(chip);
 711         unsigned long flags;
 712
 713         raw_spin_lock_irqsave(&bank->lock, flags);
 714         bank->mod_usage &= ~(BIT(offset));
 715         if (!LINE_USED(bank->irq_usage, offset)) {
 716                 omap_set_gpio_direction(bank, offset, 1);
 717                 omap_clear_gpio_debounce(bank, offset);
 718         }
 719         omap_disable_gpio_module(bank, offset);
 720         raw_spin_unlock_irqrestore(&bank->lock, flags);
 721
 722         pm_runtime_put(chip->parent);
 723 }
 724
 725 /*
 726  * We need to unmask the GPIO bank interrupt as soon as possible to
 727  * avoid missing GPIO interrupts for other lines in the bank.
 728  * Then we need to mask-read-clear-unmask the triggered GPIO lines
 729  * in the bank to avoid missing nested interrupts for a GPIO line.
 730  * If we wait to unmask individual GPIO lines in the bank after the
 731  * line's interrupt handler has been run, we may miss some nested
 732  * interrupts.
 733  */
 734 static irqreturn_t omap_gpio_irq_handler(int irq, void *gpiobank)
 735 {
 736         void __iomem *isr_reg = NULL;
 737         u32 enabled, isr, level_mask;
 738         unsigned int bit;
 739         struct gpio_bank *bank = gpiobank;
 740         unsigned long wa_lock_flags;
 741         unsigned long lock_flags;
 742
 743         isr_reg = bank->base + bank->regs->irqstatus;
 744         if (WARN_ON(!isr_reg))
 745                 goto exit;
 746
 747         if (WARN_ONCE(!pm_runtime_active(bank->chip.parent),
 748                       "gpio irq%i while runtime suspended?\n", irq))
 749                 return IRQ_NONE;
 750
 751         while (1) {
 752                 raw_spin_lock_irqsave(&bank->lock, lock_flags);
 753
 754                 enabled = omap_get_gpio_irqbank_mask(bank);
 755                 isr = readl_relaxed(isr_reg) & enabled;
 756
 757                 if (bank->level_mask)
 758                         level_mask = bank->level_mask & enabled;
 759                 else
 760                         level_mask = 0;
 761
 762                 /* clear edge sensitive interrupts before handler(s) are
 763                 called so that we don't miss any interrupt occurred while
 764                 executing them */
 765                 if (isr & ~level_mask)
 766                         omap_clear_gpio_irqbank(bank, isr & ~level_mask);
 767
 768                 raw_spin_unlock_irqrestore(&bank->lock, lock_flags);
 769
 770                 if (!isr)
 771                         break;
 772
 773                 while (isr) {
 774                         bit = __ffs(isr);
 775                         isr &= ~(BIT(bit));
 776
 777                         raw_spin_lock_irqsave(&bank->lock, lock_flags);
 778                         /*
 779                          * Some chips can't respond to both rising and falling
 780                          * at the same time.  If this irq was requested with
 781                          * both flags, we need to flip the ICR data for the IRQ
 782                          * to respond to the IRQ for the opposite direction.
 783                          * This will be indicated in the bank toggle_mask.
 784                          */
 785                         if (bank->toggle_mask & (BIT(bit)))
 786                                 omap_toggle_gpio_edge_triggering(bank, bit);
 787
 788                         raw_spin_unlock_irqrestore(&bank->lock, lock_flags);
 789
 790                         raw_spin_lock_irqsave(&bank->wa_lock, wa_lock_flags);
 791
 792                         generic_handle_irq(irq_find_mapping(bank->chip.irq.domain,
 793                                                             bit));
 794
 795                         raw_spin_unlock_irqrestore(&bank->wa_lock,
 796                                                    wa_lock_flags);
 797                 }
 798         }
 799 exit:
 800         return IRQ_HANDLED;
 801 }
 802
 803 static unsigned int omap_gpio_irq_startup(struct irq_data *d)
 804 {
 805         struct gpio_bank *bank = omap_irq_data_get_bank(d);
 806         unsigned long flags;
 807         unsigned offset = d->hwirq;
 808
 809         raw_spin_lock_irqsave(&bank->lock, flags);
 810
 811         if (!LINE_USED(bank->mod_usage, offset))
 812                 omap_set_gpio_direction(bank, offset, 1);
 813         else if (!omap_gpio_is_input(bank, offset))
 814                 goto err;
 815         omap_enable_gpio_module(bank, offset);
 816         bank->irq_usage |= BIT(offset);
 817
 818         raw_spin_unlock_irqrestore(&bank->lock, flags);
 819         omap_gpio_unmask_irq(d);
 820
 821         return 0;
 822 err:
 823         raw_spin_unlock_irqrestore(&bank->lock, flags);
 824         return -EINVAL;
 825 }
 826
 827 static void omap_gpio_irq_shutdown(struct irq_data *d)
 828 {
 829         struct gpio_bank *bank = omap_irq_data_get_bank(d);
 830         unsigned long flags;
 831         unsigned offset = d->hwirq;
 832
 833         raw_spin_lock_irqsave(&bank->lock, flags);
 834         bank->irq_usage &= ~(BIT(offset));
 835         omap_set_gpio_irqenable(bank, offset, 0);
 836         omap_clear_gpio_irqstatus(bank, offset);
 837         omap_set_gpio_triggering(bank, offset, IRQ_TYPE_NONE);
 838         if (!LINE_USED(bank->mod_usage, offset))
 839                 omap_clear_gpio_debounce(bank, offset);
 840         omap_disable_gpio_module(bank, offset);
 841         raw_spin_unlock_irqrestore(&bank->lock, flags);
 842 }
 843
 844 static void omap_gpio_irq_bus_lock(struct irq_data *data)
 845 {
 846         struct gpio_bank *bank = omap_irq_data_get_bank(data);
 847
 848         pm_runtime_get_sync(bank->chip.parent);
 849 }
 850
 851 static void gpio_irq_bus_sync_unlock(struct irq_data *data)
 852 {
 853         struct gpio_bank *bank = omap_irq_data_get_bank(data);
 854
 855         pm_runtime_put(bank->chip.parent);
 856 }
 857
 858 static void omap_gpio_ack_irq(struct irq_data *d)
 859 {
 860         struct gpio_bank *bank = omap_irq_data_get_bank(d);
 861         unsigned offset = d->hwirq;
 862
 863         omap_clear_gpio_irqstatus(bank, offset);
 864 }
 865
 866 static void omap_gpio_mask_irq(struct irq_data *d)
 867 {
 868         struct gpio_bank *bank = omap_irq_data_get_bank(d);
 869         unsigned offset = d->hwirq;
 870         unsigned long flags;
 871
 872         raw_spin_lock_irqsave(&bank->lock, flags);
 873         omap_set_gpio_irqenable(bank, offset, 0);
 874         omap_set_gpio_triggering(bank, offset, IRQ_TYPE_NONE);
 875         raw_spin_unlock_irqrestore(&bank->lock, flags);
 876 }
 877
 878 static void omap_gpio_unmask_irq(struct irq_data *d)
 879 {
 880         struct gpio_bank *bank = omap_irq_data_get_bank(d);
 881         unsigned offset = d->hwirq;
 882         u32 trigger = irqd_get_trigger_type(d);
 883         unsigned long flags;
 884
 885         raw_spin_lock_irqsave(&bank->lock, flags);
 886         if (trigger)
 887                 omap_set_gpio_triggering(bank, offset, trigger);
 888
 889         omap_set_gpio_irqenable(bank, offset, 1);
 890
 891         /*
 892          * For level-triggered GPIOs, clearing must be done after the source
 893          * is cleared, thus after the handler has run. OMAP4 needs this done
 894          * after enabing the interrupt to clear the wakeup status.
 895          */
 896         if (bank->level_mask & BIT(offset))
 897                 omap_clear_gpio_irqstatus(bank, offset);
 898
 899         raw_spin_unlock_irqrestore(&bank->lock, flags);
 900 }
 901
 902 /*---------------------------------------------------------------------*/
 903
 904 static int omap_mpuio_suspend_noirq(struct device *dev)
 905 {
 906         struct gpio_bank        *bank = dev_get_drvdata(dev);
 907         void __iomem            *mask_reg = bank->base +
 908                                         OMAP_MPUIO_GPIO_MASKIT / bank->stride;
 909         unsigned long           flags;
 910
 911         raw_spin_lock_irqsave(&bank->lock, flags);
 912         writel_relaxed(0xffff & ~bank->context.wake_en, mask_reg);
 913         raw_spin_unlock_irqrestore(&bank->lock, flags);
 914
 915         return 0;
 916 }
 917
 918 static int omap_mpuio_resume_noirq(struct device *dev)
 919 {
 920         struct gpio_bank        *bank = dev_get_drvdata(dev);
 921         void __iomem            *mask_reg = bank->base +
 922                                         OMAP_MPUIO_GPIO_MASKIT / bank->stride;
 923         unsigned long           flags;
 924
 925         raw_spin_lock_irqsave(&bank->lock, flags);
 926         writel_relaxed(bank->context.wake_en, mask_reg);
 927         raw_spin_unlock_irqrestore(&bank->lock, flags);
 928
 929         return 0;
 930 }
 931
 932 static const struct dev_pm_ops omap_mpuio_dev_pm_ops = {
 933         .suspend_noirq = omap_mpuio_suspend_noirq,
 934         .resume_noirq = omap_mpuio_resume_noirq,
 935 };
 936
 937 /* use platform_driver for this. */
 938 static struct platform_driver omap_mpuio_driver = {
 939         .driver         = {
 940                 .name   = "mpuio",
 941                 .pm     = &omap_mpuio_dev_pm_ops,
 942         },
 943 };
 944
 945 static struct platform_device omap_mpuio_device = {
 946         .name           = "mpuio",
 947         .id             = -1,
 948         .dev = {
 949                 .driver = &omap_mpuio_driver.driver,
 950         }
 951         /* could list the /proc/iomem resources */
 952 };
 953
 954 static inline void omap_mpuio_init(struct gpio_bank *bank)
 955 {
 956         platform_set_drvdata(&omap_mpuio_device, bank);
 957
 958         if (platform_driver_register(&omap_mpuio_driver) == 0)
 959                 (void) platform_device_register(&omap_mpuio_device);
 960 }
 961
 962 /*---------------------------------------------------------------------*/
 963
 964 static int omap_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
 965 {
 966         struct gpio_bank *bank;
 967         unsigned long flags;
 968         void __iomem *reg;
 969         int dir;
 970
 971         bank = gpiochip_get_data(chip);
 972         reg = bank->base + bank->regs->direction;
 973         raw_spin_lock_irqsave(&bank->lock, flags);
 974         dir = !!(readl_relaxed(reg) & BIT(offset));
 975         raw_spin_unlock_irqrestore(&bank->lock, flags);
 976         return dir;
 977 }
 978
 979 static int omap_gpio_input(struct gpio_chip *chip, unsigned offset)
 980 {
 981         struct gpio_bank *bank;
 982         unsigned long flags;
 983
 984         bank = gpiochip_get_data(chip);
 985         raw_spin_lock_irqsave(&bank->lock, flags);
 986         omap_set_gpio_direction(bank, offset, 1);
 987         raw_spin_unlock_irqrestore(&bank->lock, flags);
 988         return 0;
 989 }
 990
 991 static int omap_gpio_get(struct gpio_chip *chip, unsigned offset)
 992 {
 993         struct gpio_bank *bank;
 994
 995         bank = gpiochip_get_data(chip);
 996
 997         if (omap_gpio_is_input(bank, offset))
 998                 return omap_get_gpio_datain(bank, offset);
 999         else
1000                 return omap_get_gpio_dataout(bank, offset);
1001 }
1002
1003 static int omap_gpio_output(struct gpio_chip *chip, unsigned offset, int value)
1004 {
1005         struct gpio_bank *bank;
1006         unsigned long flags;
1007
1008         bank = gpiochip_get_data(chip);
1009         raw_spin_lock_irqsave(&bank->lock, flags);
1010         bank->set_dataout(bank, offset, value);
1011         omap_set_gpio_direction(bank, offset, 0);
1012         raw_spin_unlock_irqrestore(&bank->lock, flags);
1013         return 0;
1014 }
1015
1016 static int omap_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask,
1017                                   unsigned long *bits)
1018 {
1019         struct gpio_bank *bank = gpiochip_get_data(chip);
1020         void __iomem *reg = bank->base + bank->regs->direction;
1021         unsigned long in = readl_relaxed(reg), l;
1022
1023         *bits = 0;
1024
1025         l = in & *mask;
1026         if (l)
1027                 *bits |= omap_get_gpio_datain_multiple(bank, &l);
1028
1029         l = ~in & *mask;
1030         if (l)
1031                 *bits |= omap_get_gpio_dataout_multiple(bank, &l);
1032
1033         return 0;
1034 }
1035
1036 static int omap_gpio_debounce(struct gpio_chip *chip, unsigned offset,
1037                               unsigned debounce)
1038 {
1039         struct gpio_bank *bank;
1040         unsigned long flags;
1041         int ret;
1042
1043         bank = gpiochip_get_data(chip);
1044
1045         raw_spin_lock_irqsave(&bank->lock, flags);
1046         ret = omap2_set_gpio_debounce(bank, offset, debounce);
1047         raw_spin_unlock_irqrestore(&bank->lock, flags);
1048
1049         if (ret)
1050                 dev_info(chip->parent,
1051                          "Could not set line %u debounce to %u microseconds (%d)",
1052                          offset, debounce, ret);
1053
1054         return ret;
1055 }
1056
1057 static int omap_gpio_set_config(struct gpio_chip *chip, unsigned offset,
1058                                 unsigned long config)
1059 {
1060         u32 debounce;
1061
1062         if (pinconf_to_config_param(config) != PIN_CONFIG_INPUT_DEBOUNCE)
1063                 return -ENOTSUPP;
1064
1065         debounce = pinconf_to_config_argument(config);
1066         return omap_gpio_debounce(chip, offset, debounce);
1067 }
1068
1069 static void omap_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
1070 {
1071         struct gpio_bank *bank;
1072         unsigned long flags;
1073
1074         bank = gpiochip_get_data(chip);
1075         raw_spin_lock_irqsave(&bank->lock, flags);
1076         bank->set_dataout(bank, offset, value);
1077         raw_spin_unlock_irqrestore(&bank->lock, flags);
1078 }
1079
1080 static void omap_gpio_set_multiple(struct gpio_chip *chip, unsigned long *mask,
1081                                    unsigned long *bits)
1082 {
1083         struct gpio_bank *bank = gpiochip_get_data(chip);
1084         unsigned long flags;
1085
1086         raw_spin_lock_irqsave(&bank->lock, flags);
1087         bank->set_dataout_multiple(bank, mask, bits);
1088         raw_spin_unlock_irqrestore(&bank->lock, flags);
1089 }
1090
1091 /*---------------------------------------------------------------------*/
1092
1093 static void omap_gpio_show_rev(struct gpio_bank *bank)
1094 {
1095         static bool called;
1096         u32 rev;
1097
1098         if (called || bank->regs->revision == USHRT_MAX)
1099                 return;
1100
1101         rev = readw_relaxed(bank->base + bank->regs->revision);
1102         pr_info("OMAP GPIO hardware version %d.%d\n",
1103                 (rev >> 4) & 0x0f, rev & 0x0f);
1104
1105         called = true;
1106 }
1107
1108 static void omap_gpio_mod_init(struct gpio_bank *bank)
1109 {
1110         void __iomem *base = bank->base;
1111         u32 l = 0xffffffff;
1112
1113         if (bank->width == 16)
1114                 l = 0xffff;
1115
1116         if (bank->is_mpuio) {
1117                 writel_relaxed(l, bank->base + bank->regs->irqenable);
1118                 return;
1119         }
1120
1121         omap_gpio_rmw(base, bank->regs->irqenable, l,
1122                       bank->regs->irqenable_inv);
1123         omap_gpio_rmw(base, bank->regs->irqstatus, l,
1124                       !bank->regs->irqenable_inv);
1125         if (bank->regs->debounce_en)
1126                 writel_relaxed(0, base + bank->regs->debounce_en);
1127
1128         /* Save OE default value (0xffffffff) in the context */
1129         bank->context.oe = readl_relaxed(bank->base + bank->regs->direction);
1130          /* Initialize interface clk ungated, module enabled */
1131         if (bank->regs->ctrl)
1132                 writel_relaxed(0, base + bank->regs->ctrl);
1133 }
1134
1135 static int omap_gpio_chip_init(struct gpio_bank *bank, struct irq_chip *irqc)
1136 {
1137         struct gpio_irq_chip *irq;
1138         static int gpio;
1139         const char *label;
1140         int irq_base = 0;
1141         int ret;
1142
1143         /*
1144          * REVISIT eventually switch from OMAP-specific gpio structs
1145          * over to the generic ones
1146          */
1147         bank->chip.request = omap_gpio_request;
1148         bank->chip.free = omap_gpio_free;
1149         bank->chip.get_direction = omap_gpio_get_direction;
1150         bank->chip.direction_input = omap_gpio_input;
1151         bank->chip.get = omap_gpio_get;
1152         bank->chip.get_multiple = omap_gpio_get_multiple;
1153         bank->chip.direction_output = omap_gpio_output;
1154         bank->chip.set_config = omap_gpio_set_config;
1155         bank->chip.set = omap_gpio_set;
1156         bank->chip.set_multiple = omap_gpio_set_multiple;
1157         if (bank->is_mpuio) {
1158                 bank->chip.label = "mpuio";
1159                 if (bank->regs->wkup_en)
1160                         bank->chip.parent = &omap_mpuio_device.dev;
1161                 bank->chip.base = OMAP_MPUIO(0);
1162         } else {
1163                 label = devm_kasprintf(bank->chip.parent, GFP_KERNEL, "gpio-%d-%d",
1164                                        gpio, gpio + bank->width - 1);
1165                 if (!label)
1166                         return -ENOMEM;
1167                 bank->chip.label = label;
1168                 bank->chip.base = gpio;
1169         }
1170         bank->chip.ngpio = bank->width;
1171
1172 #ifdef CONFIG_ARCH_OMAP1
1173         /*
1174          * REVISIT: Once we have OMAP1 supporting SPARSE_IRQ, we can drop
1175          * irq_alloc_descs() since a base IRQ offset will no longer be needed.
1176          */
1177         irq_base = devm_irq_alloc_descs(bank->chip.parent,
1178                                         -1, 0, bank->width, 0);
1179         if (irq_base < 0) {
1180                 dev_err(bank->chip.parent, "Couldn't allocate IRQ numbers\n");
1181                 return -ENODEV;
1182         }
1183 #endif
1184
1185         /* MPUIO is a bit different, reading IRQ status clears it */
1186         if (bank->is_mpuio) {
1187                 irqc->irq_ack = dummy_irq_chip.irq_ack;
1188                 if (!bank->regs->wkup_en)
1189                         irqc->irq_set_wake = NULL;
1190         }
1191
1192         irq = &bank->chip.irq;
1193         irq->chip = irqc;
1194         irq->handler = handle_bad_irq;
1195         irq->default_type = IRQ_TYPE_NONE;
1196         irq->num_parents = 1;
1197         irq->parents = &bank->irq;
1198         irq->first = irq_base;
1199
1200         ret = gpiochip_add_data(&bank->chip, bank);
1201         if (ret) {
1202                 dev_err(bank->chip.parent,
1203                         "Could not register gpio chip %d\n", ret);
1204                 return ret;
1205         }
1206
1207         ret = devm_request_irq(bank->chip.parent, bank->irq,
1208                                omap_gpio_irq_handler,
1209                                0, dev_name(bank->chip.parent), bank);
1210         if (ret)
1211                 gpiochip_remove(&bank->chip);
1212
1213         if (!bank->is_mpuio)
1214                 gpio += bank->width;
1215
1216         return ret;
1217 }
1218
1219 static void omap_gpio_init_context(struct gpio_bank *p)
1220 {
1221         struct omap_gpio_reg_offs *regs = p->regs;
1222         void __iomem *base = p->base;
1223
1224         p->context.ctrl         = readl_relaxed(base + regs->ctrl);
1225         p->context.oe           = readl_relaxed(base + regs->direction);
1226         p->context.wake_en      = readl_relaxed(base + regs->wkup_en);
1227         p->context.leveldetect0 = readl_relaxed(base + regs->leveldetect0);
1228         p->context.leveldetect1 = readl_relaxed(base + regs->leveldetect1);
1229         p->context.risingdetect = readl_relaxed(base + regs->risingdetect);
1230         p->context.fallingdetect = readl_relaxed(base + regs->fallingdetect);
1231         p->context.irqenable1   = readl_relaxed(base + regs->irqenable);
1232         p->context.irqenable2   = readl_relaxed(base + regs->irqenable2);
1233
1234         if (regs->set_dataout && p->regs->clr_dataout)
1235                 p->context.dataout = readl_relaxed(base + regs->set_dataout);
1236         else
1237                 p->context.dataout = readl_relaxed(base + regs->dataout);
1238
1239         p->context_valid = true;
1240 }
1241
1242 static void omap_gpio_restore_context(struct gpio_bank *bank)
1243 {
1244         writel_relaxed(bank->context.wake_en,
1245                                 bank->base + bank->regs->wkup_en);
1246         writel_relaxed(bank->context.ctrl, bank->base + bank->regs->ctrl);
1247         writel_relaxed(bank->context.leveldetect0,
1248                                 bank->base + bank->regs->leveldetect0);
1249         writel_relaxed(bank->context.leveldetect1,
1250                                 bank->base + bank->regs->leveldetect1);
1251         writel_relaxed(bank->context.risingdetect,
1252                                 bank->base + bank->regs->risingdetect);
1253         writel_relaxed(bank->context.fallingdetect,
1254                                 bank->base + bank->regs->fallingdetect);
1255         if (bank->regs->set_dataout && bank->regs->clr_dataout)
1256                 writel_relaxed(bank->context.dataout,
1257                                 bank->base + bank->regs->set_dataout);
1258         else
1259                 writel_relaxed(bank->context.dataout,
1260                                 bank->base + bank->regs->dataout);
1261         writel_relaxed(bank->context.oe, bank->base + bank->regs->direction);
1262
1263         if (bank->dbck_enable_mask) {
1264                 writel_relaxed(bank->context.debounce, bank->base +
1265                                         bank->regs->debounce);
1266                 writel_relaxed(bank->context.debounce_en,
1267                                         bank->base + bank->regs->debounce_en);
1268         }
1269
1270         writel_relaxed(bank->context.irqenable1,
1271                                 bank->base + bank->regs->irqenable);
1272         writel_relaxed(bank->context.irqenable2,
1273                                 bank->base + bank->regs->irqenable2);
1274 }
1275
1276 static void omap_gpio_idle(struct gpio_bank *bank, bool may_lose_context)
1277 {
1278         struct device *dev = bank->chip.parent;
1279         void __iomem *base = bank->base;
1280         u32 nowake;
1281
1282         bank->saved_datain = readl_relaxed(base + bank->regs->datain);
1283
1284         if (!bank->enabled_non_wakeup_gpios)
1285                 goto update_gpio_context_count;
1286
1287         if (!may_lose_context)
1288                 goto update_gpio_context_count;
1289
1290         /*
1291          * If going to OFF, remove triggering for all wkup domain
1292          * non-wakeup GPIOs.  Otherwise spurious IRQs will be
1293          * generated.  See OMAP2420 Errata item 1.101.
1294          */
1295         if (!bank->loses_context && bank->enabled_non_wakeup_gpios) {
1296                 nowake = bank->enabled_non_wakeup_gpios;
1297                 omap_gpio_rmw(base, bank->regs->fallingdetect, nowake, ~nowake);
1298                 omap_gpio_rmw(base, bank->regs->risingdetect, nowake, ~nowake);
1299         }
1300
1301 update_gpio_context_count:
1302         if (bank->get_context_loss_count)
1303                 bank->context_loss_count =
1304                                 bank->get_context_loss_count(dev);
1305
1306         omap_gpio_dbck_disable(bank);
1307 }
1308
1309 static void omap_gpio_unidle(struct gpio_bank *bank)
1310 {
1311         struct device *dev = bank->chip.parent;
1312         u32 l = 0, gen, gen0, gen1;
1313         int c;
1314
1315         /*
1316          * On the first resume during the probe, the context has not
1317          * been initialised and so initialise it now. Also initialise
1318          * the context loss count.
1319          */
1320         if (bank->loses_context && !bank->context_valid) {
1321                 omap_gpio_init_context(bank);
1322
1323                 if (bank->get_context_loss_count)
1324                         bank->context_loss_count =
1325                                 bank->get_context_loss_count(dev);
1326         }
1327
1328         omap_gpio_dbck_enable(bank);
1329
1330         if (bank->loses_context) {
1331                 if (!bank->get_context_loss_count) {
1332                         omap_gpio_restore_context(bank);
1333                 } else {
1334                         c = bank->get_context_loss_count(dev);
1335                         if (c != bank->context_loss_count) {
1336                                 omap_gpio_restore_context(bank);
1337                         } else {
1338                                 return;
1339                         }
1340                 }
1341         } else {
1342                 /* Restore changes done for OMAP2420 errata 1.101 */
1343                 writel_relaxed(bank->context.fallingdetect,
1344                                bank->base + bank->regs->fallingdetect);
1345                 writel_relaxed(bank->context.risingdetect,
1346                                bank->base + bank->regs->risingdetect);
1347         }
1348
1349         l = readl_relaxed(bank->base + bank->regs->datain);
1350
1351         /*
1352          * Check if any of the non-wakeup interrupt GPIOs have changed
1353          * state.  If so, generate an IRQ by software.  This is
1354          * horribly racy, but it's the best we can do to work around
1355          * this silicon bug.
1356          */
1357         l ^= bank->saved_datain;
1358         l &= bank->enabled_non_wakeup_gpios;
1359
1360         /*
1361          * No need to generate IRQs for the rising edge for gpio IRQs
1362          * configured with falling edge only; and vice versa.
1363          */
1364         gen0 = l & bank->context.fallingdetect;
1365         gen0 &= bank->saved_datain;
1366
1367         gen1 = l & bank->context.risingdetect;
1368         gen1 &= ~(bank->saved_datain);
1369
1370         /* FIXME: Consider GPIO IRQs with level detections properly! */
1371         gen = l & (~(bank->context.fallingdetect) &
1372                                          ~(bank->context.risingdetect));
1373         /* Consider all GPIO IRQs needed to be updated */
1374         gen |= gen0 | gen1;
1375
1376         if (gen) {
1377                 u32 old0, old1;
1378
1379                 old0 = readl_relaxed(bank->base + bank->regs->leveldetect0);
1380                 old1 = readl_relaxed(bank->base + bank->regs->leveldetect1);
1381
1382                 if (!bank->regs->irqstatus_raw0) {
1383                         writel_relaxed(old0 | gen, bank->base +
1384                                                 bank->regs->leveldetect0);
1385                         writel_relaxed(old1 | gen, bank->base +
1386                                                 bank->regs->leveldetect1);
1387                 }
1388
1389                 if (bank->regs->irqstatus_raw0) {
1390                         writel_relaxed(old0 | l, bank->base +
1391                                                 bank->regs->leveldetect0);
1392                         writel_relaxed(old1 | l, bank->base +
1393                                                 bank->regs->leveldetect1);
1394                 }
1395                 writel_relaxed(old0, bank->base + bank->regs->leveldetect0);
1396                 writel_relaxed(old1, bank->base + bank->regs->leveldetect1);
1397         }
1398 }
1399
1400 static int gpio_omap_cpu_notifier(struct notifier_block *nb,
1401                                   unsigned long cmd, void *v)
1402 {
1403         struct gpio_bank *bank;
1404         unsigned long flags;
1405
1406         bank = container_of(nb, struct gpio_bank, nb);
1407
1408         raw_spin_lock_irqsave(&bank->lock, flags);
1409         switch (cmd) {
1410         case CPU_CLUSTER_PM_ENTER:
1411                 if (bank->is_suspended)
1412                         break;
1413                 omap_gpio_idle(bank, true);
1414                 break;
1415         case CPU_CLUSTER_PM_ENTER_FAILED:
1416         case CPU_CLUSTER_PM_EXIT:
1417                 if (bank->is_suspended)
1418                         break;
1419                 omap_gpio_unidle(bank);
1420                 break;
1421         }
1422         raw_spin_unlock_irqrestore(&bank->lock, flags);
1423
1424         return NOTIFY_OK;
1425 }
1426
1427 static struct omap_gpio_reg_offs omap2_gpio_regs = {
1428         .revision =             OMAP24XX_GPIO_REVISION,
1429         .direction =            OMAP24XX_GPIO_OE,
1430         .datain =               OMAP24XX_GPIO_DATAIN,
1431         .dataout =              OMAP24XX_GPIO_DATAOUT,
1432         .set_dataout =          OMAP24XX_GPIO_SETDATAOUT,
1433         .clr_dataout =          OMAP24XX_GPIO_CLEARDATAOUT,
1434         .irqstatus =            OMAP24XX_GPIO_IRQSTATUS1,
1435         .irqstatus2 =           OMAP24XX_GPIO_IRQSTATUS2,
1436         .irqenable =            OMAP24XX_GPIO_IRQENABLE1,
1437         .irqenable2 =           OMAP24XX_GPIO_IRQENABLE2,
1438         .set_irqenable =        OMAP24XX_GPIO_SETIRQENABLE1,
1439         .clr_irqenable =        OMAP24XX_GPIO_CLEARIRQENABLE1,
1440         .debounce =             OMAP24XX_GPIO_DEBOUNCE_VAL,
1441         .debounce_en =          OMAP24XX_GPIO_DEBOUNCE_EN,
1442         .ctrl =                 OMAP24XX_GPIO_CTRL,
1443         .wkup_en =              OMAP24XX_GPIO_WAKE_EN,
1444         .leveldetect0 =         OMAP24XX_GPIO_LEVELDETECT0,
1445         .leveldetect1 =         OMAP24XX_GPIO_LEVELDETECT1,
1446         .risingdetect =         OMAP24XX_GPIO_RISINGDETECT,
1447         .fallingdetect =        OMAP24XX_GPIO_FALLINGDETECT,
1448 };
1449
1450 static struct omap_gpio_reg_offs omap4_gpio_regs = {
1451         .revision =             OMAP4_GPIO_REVISION,
1452         .direction =            OMAP4_GPIO_OE,
1453         .datain =               OMAP4_GPIO_DATAIN,
1454         .dataout =              OMAP4_GPIO_DATAOUT,
1455         .set_dataout =          OMAP4_GPIO_SETDATAOUT,
1456         .clr_dataout =          OMAP4_GPIO_CLEARDATAOUT,
1457         .irqstatus =            OMAP4_GPIO_IRQSTATUS0,
1458         .irqstatus2 =           OMAP4_GPIO_IRQSTATUS1,
1459         .irqenable =            OMAP4_GPIO_IRQSTATUSSET0,
1460         .irqenable2 =           OMAP4_GPIO_IRQSTATUSSET1,
1461         .set_irqenable =        OMAP4_GPIO_IRQSTATUSSET0,
1462         .clr_irqenable =        OMAP4_GPIO_IRQSTATUSCLR0,
1463         .debounce =             OMAP4_GPIO_DEBOUNCINGTIME,
1464         .debounce_en =          OMAP4_GPIO_DEBOUNCENABLE,
1465         .ctrl =                 OMAP4_GPIO_CTRL,
1466         .wkup_en =              OMAP4_GPIO_IRQWAKEN0,
1467         .leveldetect0 =         OMAP4_GPIO_LEVELDETECT0,
1468         .leveldetect1 =         OMAP4_GPIO_LEVELDETECT1,
1469         .risingdetect =         OMAP4_GPIO_RISINGDETECT,
1470         .fallingdetect =        OMAP4_GPIO_FALLINGDETECT,
1471 };
1472
1473 static const struct omap_gpio_platform_data omap2_pdata = {
1474         .regs = &omap2_gpio_regs,
1475         .bank_width = 32,
1476         .dbck_flag = false,
1477 };
1478
1479 static const struct omap_gpio_platform_data omap3_pdata = {
1480         .regs = &omap2_gpio_regs,
1481         .bank_width = 32,
1482         .dbck_flag = true,
1483 };
1484
1485 static const struct omap_gpio_platform_data omap4_pdata = {
1486         .regs = &omap4_gpio_regs,
1487         .bank_width = 32,
1488         .dbck_flag = true,
1489 };
1490
1491 static const struct of_device_id omap_gpio_match[] = {
1492         {
1493                 .compatible = "ti,omap4-gpio",
1494                 .data = &omap4_pdata,
1495         },
1496         {
1497                 .compatible = "ti,omap3-gpio",
1498                 .data = &omap3_pdata,
1499         },
1500         {
1501                 .compatible = "ti,omap2-gpio",
1502                 .data = &omap2_pdata,
1503         },
1504         { },
1505 };
1506 MODULE_DEVICE_TABLE(of, omap_gpio_match);
1507
1508 static int omap_gpio_probe(struct platform_device *pdev)
1509 {
1510         struct device *dev = &pdev->dev;
1511         struct device_node *node = dev->of_node;
1512         const struct of_device_id *match;
1513         const struct omap_gpio_platform_data *pdata;
1514         struct gpio_bank *bank;
1515         struct irq_chip *irqc;
1516         int ret;
1517
1518         match = of_match_device(of_match_ptr(omap_gpio_match), dev);
1519
1520         pdata = match ? match->data : dev_get_platdata(dev);
1521         if (!pdata)
1522                 return -EINVAL;
1523
1524         bank = devm_kzalloc(dev, sizeof(*bank), GFP_KERNEL);
1525         if (!bank)
1526                 return -ENOMEM;
1527
1528         irqc = devm_kzalloc(dev, sizeof(*irqc), GFP_KERNEL);
1529         if (!irqc)
1530                 return -ENOMEM;
1531
1532         irqc->irq_startup = omap_gpio_irq_startup,
1533         irqc->irq_shutdown = omap_gpio_irq_shutdown,
1534         irqc->irq_ack = omap_gpio_ack_irq,
1535         irqc->irq_mask = omap_gpio_mask_irq,
1536         irqc->irq_unmask = omap_gpio_unmask_irq,
1537         irqc->irq_set_type = omap_gpio_irq_type,
1538         irqc->irq_set_wake = omap_gpio_wake_enable,
1539         irqc->irq_bus_lock = omap_gpio_irq_bus_lock,
1540         irqc->irq_bus_sync_unlock = gpio_irq_bus_sync_unlock,
1541         irqc->name = dev_name(&pdev->dev);
1542         irqc->flags = IRQCHIP_MASK_ON_SUSPEND;
1543         irqc->parent_device = dev;
1544
1545         bank->irq = platform_get_irq(pdev, 0);
1546         if (bank->irq <= 0) {
1547                 if (!bank->irq)
1548                         bank->irq = -ENXIO;
1549                 if (bank->irq != -EPROBE_DEFER)
1550                         dev_err(dev,
1551                                 "can't get irq resource ret=%d\n", bank->irq);
1552                 return bank->irq;
1553         }
1554
1555         bank->chip.parent = dev;
1556         bank->chip.owner = THIS_MODULE;
1557         bank->dbck_flag = pdata->dbck_flag;
1558         bank->stride = pdata->bank_stride;
1559         bank->width = pdata->bank_width;
1560         bank->is_mpuio = pdata->is_mpuio;
1561         bank->non_wakeup_gpios = pdata->non_wakeup_gpios;
1562         bank->regs = pdata->regs;
1563 #ifdef CONFIG_OF_GPIO
1564         bank->chip.of_node = of_node_get(node);
1565 #endif
1566
1567         if (node) {
1568                 if (!of_property_read_bool(node, "ti,gpio-always-on"))
1569                         bank->loses_context = true;
1570         } else {
1571                 bank->loses_context = pdata->loses_context;
1572
1573                 if (bank->loses_context)
1574                         bank->get_context_loss_count =
1575                                 pdata->get_context_loss_count;
1576         }
1577
1578         if (bank->regs->set_dataout && bank->regs->clr_dataout) {
1579                 bank->set_dataout = omap_set_gpio_dataout_reg;
1580                 bank->set_dataout_multiple = omap_set_gpio_dataout_reg_multiple;
1581         } else {
1582                 bank->set_dataout = omap_set_gpio_dataout_mask;
1583                 bank->set_dataout_multiple =
1584                                 omap_set_gpio_dataout_mask_multiple;
1585         }
1586
1587         raw_spin_lock_init(&bank->lock);
1588         raw_spin_lock_init(&bank->wa_lock);
1589
1590         /* Static mapping, never released */
1591         bank->base = devm_platform_ioremap_resource(pdev, 0);
1592         if (IS_ERR(bank->base)) {
1593                 return PTR_ERR(bank->base);
1594         }
1595
1596         if (bank->dbck_flag) {
1597                 bank->dbck = devm_clk_get(dev, "dbclk");
1598                 if (IS_ERR(bank->dbck)) {
1599                         dev_err(dev,
1600                                 "Could not get gpio dbck. Disable debounce\n");
1601                         bank->dbck_flag = false;
1602                 } else {
1603                         clk_prepare(bank->dbck);
1604                 }
1605         }
1606
1607         platform_set_drvdata(pdev, bank);
1608
1609         pm_runtime_enable(dev);
1610         pm_runtime_get_sync(dev);
1611
1612         if (bank->is_mpuio)
1613                 omap_mpuio_init(bank);
1614
1615         omap_gpio_mod_init(bank);
1616
1617         ret = omap_gpio_chip_init(bank, irqc);
1618         if (ret) {
1619                 pm_runtime_put_sync(dev);
1620                 pm_runtime_disable(dev);
1621                 if (bank->dbck_flag)
1622                         clk_unprepare(bank->dbck);
1623                 return ret;
1624         }
1625
1626         omap_gpio_show_rev(bank);
1627
1628         bank->nb.notifier_call = gpio_omap_cpu_notifier;
1629         cpu_pm_register_notifier(&bank->nb);
1630
1631         pm_runtime_put(dev);
1632
1633         return 0;
1634 }
1635
1636 static int omap_gpio_remove(struct platform_device *pdev)
1637 {
1638         struct gpio_bank *bank = platform_get_drvdata(pdev);
1639
1640         cpu_pm_unregister_notifier(&bank->nb);
1641         list_del(&bank->node);
1642         gpiochip_remove(&bank->chip);
1643         pm_runtime_disable(&pdev->dev);
1644         if (bank->dbck_flag)
1645                 clk_unprepare(bank->dbck);
1646
1647         return 0;
1648 }
1649
1650 static int __maybe_unused omap_gpio_runtime_suspend(struct device *dev)
1651 {
1652         struct gpio_bank *bank = dev_get_drvdata(dev);
1653         unsigned long flags;
1654
1655         raw_spin_lock_irqsave(&bank->lock, flags);
1656         omap_gpio_idle(bank, true);
1657         bank->is_suspended = true;
1658         raw_spin_unlock_irqrestore(&bank->lock, flags);
1659
1660         return 0;
1661 }
1662
1663 static int __maybe_unused omap_gpio_runtime_resume(struct device *dev)
1664 {
1665         struct gpio_bank *bank = dev_get_drvdata(dev);
1666         unsigned long flags;
1667
1668         raw_spin_lock_irqsave(&bank->lock, flags);
1669         omap_gpio_unidle(bank);
1670         bank->is_suspended = false;
1671         raw_spin_unlock_irqrestore(&bank->lock, flags);
1672
1673         return 0;
1674 }
1675
1676 static const struct dev_pm_ops gpio_pm_ops = {
1677         SET_RUNTIME_PM_OPS(omap_gpio_runtime_suspend, omap_gpio_runtime_resume,
1678                                                                         NULL)
1679 };
1680
1681 static struct platform_driver omap_gpio_driver = {
1682         .probe          = omap_gpio_probe,
1683         .remove         = omap_gpio_remove,
1684         .driver         = {
1685                 .name   = "omap_gpio",
1686                 .pm     = &gpio_pm_ops,
1687                 .of_match_table = omap_gpio_match,
1688         },
1689 };
1690
1691 /*
1692  * gpio driver register needs to be done before
1693  * machine_init functions access gpio APIs.
1694  * Hence omap_gpio_drv_reg() is a postcore_initcall.
1695  */
1696 static int __init omap_gpio_drv_reg(void)
1697 {
1698         return platform_driver_register(&omap_gpio_driver);
1699 }
1700 postcore_initcall(omap_gpio_drv_reg);
1701
1702 static void __exit omap_gpio_exit(void)
1703 {
1704         platform_driver_unregister(&omap_gpio_driver);
1705 }
1706 module_exit(omap_gpio_exit);
1707
1708 MODULE_DESCRIPTION("omap gpio driver");
1709 MODULE_ALIAS("platform:gpio-omap");
1710 MODULE_LICENSE("GPL v2");