drivers/gpio/gpio-bcm-kona.c

   1 /*
   2  * Broadcom Kona GPIO Driver
   3  *
   4  * Author: Broadcom Corporation <bcm-kernel-feedback-list@broadcom.com>
   5  * Copyright (C) 2012-2014 Broadcom Corporation
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation version 2.
  10  *
  11  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  12  * kind, whether express or implied; without even the implied warranty
  13  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  */
  16
  17 #include <linux/bitops.h>
  18 #include <linux/err.h>
  19 #include <linux/io.h>
  20 #include <linux/gpio/driver.h>
  21 #include <linux/of_device.h>
  22 #include <linux/of_irq.h>
  23 #include <linux/init.h>
  24 #include <linux/irqdomain.h>
  25 #include <linux/irqchip/chained_irq.h>
  26
  27 #define BCM_GPIO_PASSWD                         0x00a5a501
  28 #define GPIO_PER_BANK                           32
  29 #define GPIO_MAX_BANK_NUM                       8
  30
  31 #define GPIO_BANK(gpio)                         ((gpio) >> 5)
  32 #define GPIO_BIT(gpio)                          ((gpio) & (GPIO_PER_BANK - 1))
  33
  34 /* There is a GPIO control register for each GPIO */
  35 #define GPIO_CONTROL(gpio)                      (0x00000100 + ((gpio) << 2))
  36
  37 /* The remaining registers are per GPIO bank */
  38 #define GPIO_OUT_STATUS(bank)                   (0x00000000 + ((bank) << 2))
  39 #define GPIO_IN_STATUS(bank)                    (0x00000020 + ((bank) << 2))
  40 #define GPIO_OUT_SET(bank)                      (0x00000040 + ((bank) << 2))
  41 #define GPIO_OUT_CLEAR(bank)                    (0x00000060 + ((bank) << 2))
  42 #define GPIO_INT_STATUS(bank)                   (0x00000080 + ((bank) << 2))
  43 #define GPIO_INT_MASK(bank)                     (0x000000a0 + ((bank) << 2))
  44 #define GPIO_INT_MSKCLR(bank)                   (0x000000c0 + ((bank) << 2))
  45 #define GPIO_PWD_STATUS(bank)                   (0x00000500 + ((bank) << 2))
  46
  47 #define GPIO_GPPWR_OFFSET                       0x00000520
  48
  49 #define GPIO_GPCTR0_DBR_SHIFT                   5
  50 #define GPIO_GPCTR0_DBR_MASK                    0x000001e0
  51
  52 #define GPIO_GPCTR0_ITR_SHIFT                   3
  53 #define GPIO_GPCTR0_ITR_MASK                    0x00000018
  54 #define GPIO_GPCTR0_ITR_CMD_RISING_EDGE         0x00000001
  55 #define GPIO_GPCTR0_ITR_CMD_FALLING_EDGE        0x00000002
  56 #define GPIO_GPCTR0_ITR_CMD_BOTH_EDGE           0x00000003
  57
  58 #define GPIO_GPCTR0_IOTR_MASK                   0x00000001
  59 #define GPIO_GPCTR0_IOTR_CMD_0UTPUT             0x00000000
  60 #define GPIO_GPCTR0_IOTR_CMD_INPUT              0x00000001
  61
  62 #define GPIO_GPCTR0_DB_ENABLE_MASK              0x00000100
  63
  64 #define LOCK_CODE                               0xffffffff
  65 #define UNLOCK_CODE                             0x00000000
  66
  67 struct bcm_kona_gpio {
  68         void __iomem *reg_base;
  69         int num_bank;
  70         raw_spinlock_t lock;
  71         struct gpio_chip gpio_chip;
  72         struct irq_domain *irq_domain;
  73         struct bcm_kona_gpio_bank *banks;
  74         struct platform_device *pdev;
  75 };
  76
  77 struct bcm_kona_gpio_bank {
  78         int id;
  79         int irq;
  80         /* Used in the interrupt handler */
  81         struct bcm_kona_gpio *kona_gpio;
  82 };
  83
  84 static inline void bcm_kona_gpio_write_lock_regs(void __iomem *reg_base,
  85                                                 int bank_id, u32 lockcode)
  86 {
  87         writel(BCM_GPIO_PASSWD, reg_base + GPIO_GPPWR_OFFSET);
  88         writel(lockcode, reg_base + GPIO_PWD_STATUS(bank_id));
  89 }
  90
  91 static void bcm_kona_gpio_lock_gpio(struct bcm_kona_gpio *kona_gpio,
  92                                         unsigned gpio)
  93 {
  94         u32 val;
  95         unsigned long flags;
  96         int bank_id = GPIO_BANK(gpio);
  97
  98         raw_spin_lock_irqsave(&kona_gpio->lock, flags);
  99
 100         val = readl(kona_gpio->reg_base + GPIO_PWD_STATUS(bank_id));
 101         val |= BIT(gpio);
 102         bcm_kona_gpio_write_lock_regs(kona_gpio->reg_base, bank_id, val);
 103
 104         raw_spin_unlock_irqrestore(&kona_gpio->lock, flags);
 105 }
 106
 107 static void bcm_kona_gpio_unlock_gpio(struct bcm_kona_gpio *kona_gpio,
 108                                         unsigned gpio)
 109 {
 110         u32 val;
 111         unsigned long flags;
 112         int bank_id = GPIO_BANK(gpio);
 113
 114         raw_spin_lock_irqsave(&kona_gpio->lock, flags);
 115
 116         val = readl(kona_gpio->reg_base + GPIO_PWD_STATUS(bank_id));
 117         val &= ~BIT(gpio);
 118         bcm_kona_gpio_write_lock_regs(kona_gpio->reg_base, bank_id, val);
 119
 120         raw_spin_unlock_irqrestore(&kona_gpio->lock, flags);
 121 }
 122
 123 static int bcm_kona_gpio_get_dir(struct gpio_chip *chip, unsigned gpio)
 124 {
 125         struct bcm_kona_gpio *kona_gpio = gpiochip_get_data(chip);
 126         void __iomem *reg_base = kona_gpio->reg_base;
 127         u32 val;
 128
 129         val = readl(reg_base + GPIO_CONTROL(gpio)) & GPIO_GPCTR0_IOTR_MASK;
 130         return !!val;
 131 }
 132
 133 static void bcm_kona_gpio_set(struct gpio_chip *chip, unsigned gpio, int value)
 134 {
 135         struct bcm_kona_gpio *kona_gpio;
 136         void __iomem *reg_base;
 137         int bank_id = GPIO_BANK(gpio);
 138         int bit = GPIO_BIT(gpio);
 139         u32 val, reg_offset;
 140         unsigned long flags;
 141
 142         kona_gpio = gpiochip_get_data(chip);
 143         reg_base = kona_gpio->reg_base;
 144         raw_spin_lock_irqsave(&kona_gpio->lock, flags);
 145
 146         /* this function only applies to output pin */
 147         if (bcm_kona_gpio_get_dir(chip, gpio) == 1)
 148                 goto out;
 149
 150         reg_offset = value ? GPIO_OUT_SET(bank_id) : GPIO_OUT_CLEAR(bank_id);
 151
 152         val = readl(reg_base + reg_offset);
 153         val |= BIT(bit);
 154         writel(val, reg_base + reg_offset);
 155
 156 out:
 157         raw_spin_unlock_irqrestore(&kona_gpio->lock, flags);
 158 }
 159
 160 static int bcm_kona_gpio_get(struct gpio_chip *chip, unsigned gpio)
 161 {
 162         struct bcm_kona_gpio *kona_gpio;
 163         void __iomem *reg_base;
 164         int bank_id = GPIO_BANK(gpio);
 165         int bit = GPIO_BIT(gpio);
 166         u32 val, reg_offset;
 167         unsigned long flags;
 168
 169         kona_gpio = gpiochip_get_data(chip);
 170         reg_base = kona_gpio->reg_base;
 171         raw_spin_lock_irqsave(&kona_gpio->lock, flags);
 172
 173         if (bcm_kona_gpio_get_dir(chip, gpio) == 1)
 174                 reg_offset = GPIO_IN_STATUS(bank_id);
 175         else
 176                 reg_offset = GPIO_OUT_STATUS(bank_id);
 177
 178         /* read the GPIO bank status */
 179         val = readl(reg_base + reg_offset);
 180
 181         raw_spin_unlock_irqrestore(&kona_gpio->lock, flags);
 182
 183         /* return the specified bit status */
 184         return !!(val & BIT(bit));
 185 }
 186
 187 static int bcm_kona_gpio_request(struct gpio_chip *chip, unsigned gpio)
 188 {
 189         struct bcm_kona_gpio *kona_gpio = gpiochip_get_data(chip);
 190
 191         bcm_kona_gpio_unlock_gpio(kona_gpio, gpio);
 192         return 0;
 193 }
 194
 195 static void bcm_kona_gpio_free(struct gpio_chip *chip, unsigned gpio)
 196 {
 197         struct bcm_kona_gpio *kona_gpio = gpiochip_get_data(chip);
 198
 199         bcm_kona_gpio_lock_gpio(kona_gpio, gpio);
 200 }
 201
 202 static int bcm_kona_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
 203 {
 204         struct bcm_kona_gpio *kona_gpio;
 205         void __iomem *reg_base;
 206         u32 val;
 207         unsigned long flags;
 208
 209         kona_gpio = gpiochip_get_data(chip);
 210         reg_base = kona_gpio->reg_base;
 211         raw_spin_lock_irqsave(&kona_gpio->lock, flags);
 212
 213         val = readl(reg_base + GPIO_CONTROL(gpio));
 214         val &= ~GPIO_GPCTR0_IOTR_MASK;
 215         val |= GPIO_GPCTR0_IOTR_CMD_INPUT;
 216         writel(val, reg_base + GPIO_CONTROL(gpio));
 217
 218         raw_spin_unlock_irqrestore(&kona_gpio->lock, flags);
 219
 220         return 0;
 221 }
 222
 223 static int bcm_kona_gpio_direction_output(struct gpio_chip *chip,
 224                                           unsigned gpio, int value)
 225 {
 226         struct bcm_kona_gpio *kona_gpio;
 227         void __iomem *reg_base;
 228         int bank_id = GPIO_BANK(gpio);
 229         int bit = GPIO_BIT(gpio);
 230         u32 val, reg_offset;
 231         unsigned long flags;
 232
 233         kona_gpio = gpiochip_get_data(chip);
 234         reg_base = kona_gpio->reg_base;
 235         raw_spin_lock_irqsave(&kona_gpio->lock, flags);
 236
 237         val = readl(reg_base + GPIO_CONTROL(gpio));
 238         val &= ~GPIO_GPCTR0_IOTR_MASK;
 239         val |= GPIO_GPCTR0_IOTR_CMD_0UTPUT;
 240         writel(val, reg_base + GPIO_CONTROL(gpio));
 241         reg_offset = value ? GPIO_OUT_SET(bank_id) : GPIO_OUT_CLEAR(bank_id);
 242
 243         val = readl(reg_base + reg_offset);
 244         val |= BIT(bit);
 245         writel(val, reg_base + reg_offset);
 246
 247         raw_spin_unlock_irqrestore(&kona_gpio->lock, flags);
 248
 249         return 0;
 250 }
 251
 252 static int bcm_kona_gpio_to_irq(struct gpio_chip *chip, unsigned gpio)
 253 {
 254         struct bcm_kona_gpio *kona_gpio;
 255
 256         kona_gpio = gpiochip_get_data(chip);
 257         if (gpio >= kona_gpio->gpio_chip.ngpio)
 258                 return -ENXIO;
 259         return irq_create_mapping(kona_gpio->irq_domain, gpio);
 260 }
 261
 262 static int bcm_kona_gpio_set_debounce(struct gpio_chip *chip, unsigned gpio,
 263                                       unsigned debounce)
 264 {
 265         struct bcm_kona_gpio *kona_gpio;
 266         void __iomem *reg_base;
 267         u32 val, res;
 268         unsigned long flags;
 269
 270         kona_gpio = gpiochip_get_data(chip);
 271         reg_base = kona_gpio->reg_base;
 272         /* debounce must be 1-128ms (or 0) */
 273         if ((debounce > 0 && debounce < 1000) || debounce > 128000) {
 274                 dev_err(chip->parent, "Debounce value %u not in range\n",
 275                         debounce);
 276                 return -EINVAL;
 277         }
 278
 279         /* calculate debounce bit value */
 280         if (debounce != 0) {
 281                 /* Convert to ms */
 282                 debounce /= 1000;
 283                 /* find the MSB */
 284                 res = fls(debounce) - 1;
 285                 /* Check if MSB-1 is set (round up or down) */
 286                 if (res > 0 && (debounce & BIT(res - 1)))
 287                         res++;
 288         }
 289
 290         /* spin lock for read-modify-write of the GPIO register */
 291         raw_spin_lock_irqsave(&kona_gpio->lock, flags);
 292
 293         val = readl(reg_base + GPIO_CONTROL(gpio));
 294         val &= ~GPIO_GPCTR0_DBR_MASK;
 295
 296         if (debounce == 0) {
 297                 /* disable debounce */
 298                 val &= ~GPIO_GPCTR0_DB_ENABLE_MASK;
 299         } else {
 300                 val |= GPIO_GPCTR0_DB_ENABLE_MASK |
 301                     (res << GPIO_GPCTR0_DBR_SHIFT);
 302         }
 303
 304         writel(val, reg_base + GPIO_CONTROL(gpio));
 305
 306         raw_spin_unlock_irqrestore(&kona_gpio->lock, flags);
 307
 308         return 0;
 309 }
 310
 311 static int bcm_kona_gpio_set_config(struct gpio_chip *chip, unsigned gpio,
 312                                     unsigned long config)
 313 {
 314         u32 debounce;
 315
 316         if (pinconf_to_config_param(config) != PIN_CONFIG_INPUT_DEBOUNCE)
 317                 return -ENOTSUPP;
 318
 319         debounce = pinconf_to_config_argument(config);
 320         return bcm_kona_gpio_set_debounce(chip, gpio, debounce);
 321 }
 322
 323 static const struct gpio_chip template_chip = {
 324         .label = "bcm-kona-gpio",
 325         .owner = THIS_MODULE,
 326         .request = bcm_kona_gpio_request,
 327         .free = bcm_kona_gpio_free,
 328         .get_direction = bcm_kona_gpio_get_dir,
 329         .direction_input = bcm_kona_gpio_direction_input,
 330         .get = bcm_kona_gpio_get,
 331         .direction_output = bcm_kona_gpio_direction_output,
 332         .set = bcm_kona_gpio_set,
 333         .set_config = bcm_kona_gpio_set_config,
 334         .to_irq = bcm_kona_gpio_to_irq,
 335         .base = 0,
 336 };
 337
 338 static void bcm_kona_gpio_irq_ack(struct irq_data *d)
 339 {
 340         struct bcm_kona_gpio *kona_gpio;
 341         void __iomem *reg_base;
 342         unsigned gpio = d->hwirq;
 343         int bank_id = GPIO_BANK(gpio);
 344         int bit = GPIO_BIT(gpio);
 345         u32 val;
 346         unsigned long flags;
 347
 348         kona_gpio = irq_data_get_irq_chip_data(d);
 349         reg_base = kona_gpio->reg_base;
 350         raw_spin_lock_irqsave(&kona_gpio->lock, flags);
 351
 352         val = readl(reg_base + GPIO_INT_STATUS(bank_id));
 353         val |= BIT(bit);
 354         writel(val, reg_base + GPIO_INT_STATUS(bank_id));
 355
 356         raw_spin_unlock_irqrestore(&kona_gpio->lock, flags);
 357 }
 358
 359 static void bcm_kona_gpio_irq_mask(struct irq_data *d)
 360 {
 361         struct bcm_kona_gpio *kona_gpio;
 362         void __iomem *reg_base;
 363         unsigned gpio = d->hwirq;
 364         int bank_id = GPIO_BANK(gpio);
 365         int bit = GPIO_BIT(gpio);
 366         u32 val;
 367         unsigned long flags;
 368
 369         kona_gpio = irq_data_get_irq_chip_data(d);
 370         reg_base = kona_gpio->reg_base;
 371         raw_spin_lock_irqsave(&kona_gpio->lock, flags);
 372
 373         val = readl(reg_base + GPIO_INT_MASK(bank_id));
 374         val |= BIT(bit);
 375         writel(val, reg_base + GPIO_INT_MASK(bank_id));
 376         gpiochip_disable_irq(&kona_gpio->gpio_chip, gpio);
 377
 378         raw_spin_unlock_irqrestore(&kona_gpio->lock, flags);
 379 }
 380
 381 static void bcm_kona_gpio_irq_unmask(struct irq_data *d)
 382 {
 383         struct bcm_kona_gpio *kona_gpio;
 384         void __iomem *reg_base;
 385         unsigned gpio = d->hwirq;
 386         int bank_id = GPIO_BANK(gpio);
 387         int bit = GPIO_BIT(gpio);
 388         u32 val;
 389         unsigned long flags;
 390
 391         kona_gpio = irq_data_get_irq_chip_data(d);
 392         reg_base = kona_gpio->reg_base;
 393         raw_spin_lock_irqsave(&kona_gpio->lock, flags);
 394
 395         val = readl(reg_base + GPIO_INT_MSKCLR(bank_id));
 396         val |= BIT(bit);
 397         writel(val, reg_base + GPIO_INT_MSKCLR(bank_id));
 398         gpiochip_enable_irq(&kona_gpio->gpio_chip, gpio);
 399
 400         raw_spin_unlock_irqrestore(&kona_gpio->lock, flags);
 401 }
 402
 403 static int bcm_kona_gpio_irq_set_type(struct irq_data *d, unsigned int type)
 404 {
 405         struct bcm_kona_gpio *kona_gpio;
 406         void __iomem *reg_base;
 407         unsigned gpio = d->hwirq;
 408         u32 lvl_type;
 409         u32 val;
 410         unsigned long flags;
 411
 412         kona_gpio = irq_data_get_irq_chip_data(d);
 413         reg_base = kona_gpio->reg_base;
 414         switch (type & IRQ_TYPE_SENSE_MASK) {
 415         case IRQ_TYPE_EDGE_RISING:
 416                 lvl_type = GPIO_GPCTR0_ITR_CMD_RISING_EDGE;
 417                 break;
 418
 419         case IRQ_TYPE_EDGE_FALLING:
 420                 lvl_type = GPIO_GPCTR0_ITR_CMD_FALLING_EDGE;
 421                 break;
 422
 423         case IRQ_TYPE_EDGE_BOTH:
 424                 lvl_type = GPIO_GPCTR0_ITR_CMD_BOTH_EDGE;
 425                 break;
 426
 427         case IRQ_TYPE_LEVEL_HIGH:
 428         case IRQ_TYPE_LEVEL_LOW:
 429                 /* BCM GPIO doesn't support level triggering */
 430         default:
 431                 dev_err(kona_gpio->gpio_chip.parent,
 432                         "Invalid BCM GPIO irq type 0x%x\n", type);
 433                 return -EINVAL;
 434         }
 435
 436         raw_spin_lock_irqsave(&kona_gpio->lock, flags);
 437
 438         val = readl(reg_base + GPIO_CONTROL(gpio));
 439         val &= ~GPIO_GPCTR0_ITR_MASK;
 440         val |= lvl_type << GPIO_GPCTR0_ITR_SHIFT;
 441         writel(val, reg_base + GPIO_CONTROL(gpio));
 442
 443         raw_spin_unlock_irqrestore(&kona_gpio->lock, flags);
 444
 445         return 0;
 446 }
 447
 448 static void bcm_kona_gpio_irq_handler(struct irq_desc *desc)
 449 {
 450         void __iomem *reg_base;
 451         int bit, bank_id;
 452         unsigned long sta;
 453         struct bcm_kona_gpio_bank *bank = irq_desc_get_handler_data(desc);
 454         struct irq_chip *chip = irq_desc_get_chip(desc);
 455
 456         chained_irq_enter(chip, desc);
 457
 458         /*
 459          * For bank interrupts, we can't use chip_data to store the kona_gpio
 460          * pointer, since GIC needs it for its own purposes. Therefore, we get
 461          * our pointer from the bank structure.
 462          */
 463         reg_base = bank->kona_gpio->reg_base;
 464         bank_id = bank->id;
 465
 466         while ((sta = readl(reg_base + GPIO_INT_STATUS(bank_id)) &
 467                     (~(readl(reg_base + GPIO_INT_MASK(bank_id)))))) {
 468                 for_each_set_bit(bit, &sta, 32) {
 469                         int hwirq = GPIO_PER_BANK * bank_id + bit;
 470                         int child_irq =
 471                                 irq_find_mapping(bank->kona_gpio->irq_domain,
 472                                                  hwirq);
 473                         /*
 474                          * Clear interrupt before handler is called so we don't
 475                          * miss any interrupt occurred during executing them.
 476                          */
 477                         writel(readl(reg_base + GPIO_INT_STATUS(bank_id)) |
 478                                BIT(bit), reg_base + GPIO_INT_STATUS(bank_id));
 479                         /* Invoke interrupt handler */
 480                         generic_handle_irq(child_irq);
 481                 }
 482         }
 483
 484         chained_irq_exit(chip, desc);
 485 }
 486
 487 static int bcm_kona_gpio_irq_reqres(struct irq_data *d)
 488 {
 489         struct bcm_kona_gpio *kona_gpio = irq_data_get_irq_chip_data(d);
 490
 491         return gpiochip_reqres_irq(&kona_gpio->gpio_chip, d->hwirq);
 492 }
 493
 494 static void bcm_kona_gpio_irq_relres(struct irq_data *d)
 495 {
 496         struct bcm_kona_gpio *kona_gpio = irq_data_get_irq_chip_data(d);
 497
 498         gpiochip_relres_irq(&kona_gpio->gpio_chip, d->hwirq);
 499 }
 500
 501 static struct irq_chip bcm_gpio_irq_chip = {
 502         .name = "bcm-kona-gpio",
 503         .irq_ack = bcm_kona_gpio_irq_ack,
 504         .irq_mask = bcm_kona_gpio_irq_mask,
 505         .irq_unmask = bcm_kona_gpio_irq_unmask,
 506         .irq_set_type = bcm_kona_gpio_irq_set_type,
 507         .irq_request_resources = bcm_kona_gpio_irq_reqres,
 508         .irq_release_resources = bcm_kona_gpio_irq_relres,
 509 };
 510
 511 static struct of_device_id const bcm_kona_gpio_of_match[] = {
 512         { .compatible = "brcm,kona-gpio" },
 513         {}
 514 };
 515
 516 /*
 517  * This lock class tells lockdep that GPIO irqs are in a different
 518  * category than their parents, so it won't report false recursion.
 519  */
 520 static struct lock_class_key gpio_lock_class;
 521 static struct lock_class_key gpio_request_class;
 522
 523 static int bcm_kona_gpio_irq_map(struct irq_domain *d, unsigned int irq,
 524                                  irq_hw_number_t hwirq)
 525 {
 526         int ret;
 527
 528         ret = irq_set_chip_data(irq, d->host_data);
 529         if (ret < 0)
 530                 return ret;
 531         irq_set_lockdep_class(irq, &gpio_lock_class, &gpio_request_class);
 532         irq_set_chip_and_handler(irq, &bcm_gpio_irq_chip, handle_simple_irq);
 533         irq_set_noprobe(irq);
 534
 535         return 0;
 536 }
 537
 538 static void bcm_kona_gpio_irq_unmap(struct irq_domain *d, unsigned int irq)
 539 {
 540         irq_set_chip_and_handler(irq, NULL, NULL);
 541         irq_set_chip_data(irq, NULL);
 542 }
 543
 544 static const struct irq_domain_ops bcm_kona_irq_ops = {
 545         .map = bcm_kona_gpio_irq_map,
 546         .unmap = bcm_kona_gpio_irq_unmap,
 547         .xlate = irq_domain_xlate_twocell,
 548 };
 549
 550 static void bcm_kona_gpio_reset(struct bcm_kona_gpio *kona_gpio)
 551 {
 552         void __iomem *reg_base;
 553         int i;
 554
 555         reg_base = kona_gpio->reg_base;
 556         /* disable interrupts and clear status */
 557         for (i = 0; i < kona_gpio->num_bank; i++) {
 558                 /* Unlock the entire bank first */
 559                 bcm_kona_gpio_write_lock_regs(reg_base, i, UNLOCK_CODE);
 560                 writel(0xffffffff, reg_base + GPIO_INT_MASK(i));
 561                 writel(0xffffffff, reg_base + GPIO_INT_STATUS(i));
 562                 /* Now re-lock the bank */
 563                 bcm_kona_gpio_write_lock_regs(reg_base, i, LOCK_CODE);
 564         }
 565 }
 566
 567 static int bcm_kona_gpio_probe(struct platform_device *pdev)
 568 {
 569         struct device *dev = &pdev->dev;
 570         const struct of_device_id *match;
 571         struct bcm_kona_gpio_bank *bank;
 572         struct bcm_kona_gpio *kona_gpio;
 573         struct gpio_chip *chip;
 574         int ret;
 575         int i;
 576
 577         match = of_match_device(bcm_kona_gpio_of_match, dev);
 578         if (!match) {
 579                 dev_err(dev, "Failed to find gpio controller\n");
 580                 return -ENODEV;
 581         }
 582
 583         kona_gpio = devm_kzalloc(dev, sizeof(*kona_gpio), GFP_KERNEL);
 584         if (!kona_gpio)
 585                 return -ENOMEM;
 586
 587         kona_gpio->gpio_chip = template_chip;
 588         chip = &kona_gpio->gpio_chip;
 589         kona_gpio->num_bank = of_irq_count(dev->of_node);
 590         if (kona_gpio->num_bank == 0) {
 591                 dev_err(dev, "Couldn't determine # GPIO banks\n");
 592                 return -ENOENT;
 593         }
 594         if (kona_gpio->num_bank > GPIO_MAX_BANK_NUM) {
 595                 dev_err(dev, "Too many GPIO banks configured (max=%d)\n",
 596                         GPIO_MAX_BANK_NUM);
 597                 return -ENXIO;
 598         }
 599         kona_gpio->banks = devm_kcalloc(dev,
 600                                         kona_gpio->num_bank,
 601                                         sizeof(*kona_gpio->banks),
 602                                         GFP_KERNEL);
 603         if (!kona_gpio->banks)
 604                 return -ENOMEM;
 605
 606         kona_gpio->pdev = pdev;
 607         platform_set_drvdata(pdev, kona_gpio);
 608         chip->of_node = dev->of_node;
 609         chip->ngpio = kona_gpio->num_bank * GPIO_PER_BANK;
 610
 611         kona_gpio->irq_domain = irq_domain_add_linear(dev->of_node,
 612                                                       chip->ngpio,
 613                                                       &bcm_kona_irq_ops,
 614                                                       kona_gpio);
 615         if (!kona_gpio->irq_domain) {
 616                 dev_err(dev, "Couldn't allocate IRQ domain\n");
 617                 return -ENXIO;
 618         }
 619
 620         kona_gpio->reg_base = devm_platform_ioremap_resource(pdev, 0);
 621         if (IS_ERR(kona_gpio->reg_base)) {
 622                 ret = -ENXIO;
 623                 goto err_irq_domain;
 624         }
 625
 626         for (i = 0; i < kona_gpio->num_bank; i++) {
 627                 bank = &kona_gpio->banks[i];
 628                 bank->id = i;
 629                 bank->irq = platform_get_irq(pdev, i);
 630                 bank->kona_gpio = kona_gpio;
 631                 if (bank->irq < 0) {
 632                         dev_err(dev, "Couldn't get IRQ for bank %d", i);
 633                         ret = -ENOENT;
 634                         goto err_irq_domain;
 635                 }
 636         }
 637
 638         dev_info(&pdev->dev, "Setting up Kona GPIO\n");
 639
 640         bcm_kona_gpio_reset(kona_gpio);
 641
 642         ret = devm_gpiochip_add_data(dev, chip, kona_gpio);
 643         if (ret < 0) {
 644                 dev_err(dev, "Couldn't add GPIO chip -- %d\n", ret);
 645                 goto err_irq_domain;
 646         }
 647         for (i = 0; i < kona_gpio->num_bank; i++) {
 648                 bank = &kona_gpio->banks[i];
 649                 irq_set_chained_handler_and_data(bank->irq,
 650                                                  bcm_kona_gpio_irq_handler,
 651                                                  bank);
 652         }
 653
 654         raw_spin_lock_init(&kona_gpio->lock);
 655
 656         return 0;
 657
 658 err_irq_domain:
 659         irq_domain_remove(kona_gpio->irq_domain);
 660
 661         return ret;
 662 }
 663
 664 static struct platform_driver bcm_kona_gpio_driver = {
 665         .driver = {
 666                         .name = "bcm-kona-gpio",
 667                         .of_match_table = bcm_kona_gpio_of_match,
 668         },
 669         .probe = bcm_kona_gpio_probe,
 670 };
 671 builtin_platform_driver(bcm_kona_gpio_driver);