drivers/gpio/gpio-bcm-kona.c

   1 /*
   2  * Copyright (C) 2012-2013 Broadcom Corporation
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License as
   6  * published by the Free Software Foundation version 2.
   7  *
   8  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
   9  * kind, whether express or implied; without even the implied warranty
  10  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  */
  13
  14 #include <linux/bitops.h>
  15 #include <linux/err.h>
  16 #include <linux/io.h>
  17 #include <linux/gpio.h>
  18 #include <linux/of_device.h>
  19 #include <linux/of_irq.h>
  20 #include <linux/module.h>
  21 #include <linux/irqdomain.h>
  22 #include <linux/irqchip/chained_irq.h>
  23
  24 #define BCM_GPIO_PASSWD                         0x00a5a501
  25 #define GPIO_PER_BANK                           32
  26 #define GPIO_MAX_BANK_NUM                       8
  27
  28 #define GPIO_BANK(gpio)                         ((gpio) >> 5)
  29 #define GPIO_BIT(gpio)                          ((gpio) & (GPIO_PER_BANK - 1))
  30
  31 #define GPIO_OUT_STATUS(bank)                   (0x00000000 + ((bank) << 2))
  32 #define GPIO_IN_STATUS(bank)                    (0x00000020 + ((bank) << 2))
  33 #define GPIO_OUT_SET(bank)                      (0x00000040 + ((bank) << 2))
  34 #define GPIO_OUT_CLEAR(bank)                    (0x00000060 + ((bank) << 2))
  35 #define GPIO_INT_STATUS(bank)                   (0x00000080 + ((bank) << 2))
  36 #define GPIO_INT_MASK(bank)                     (0x000000a0 + ((bank) << 2))
  37 #define GPIO_INT_MSKCLR(bank)                   (0x000000c0 + ((bank) << 2))
  38 #define GPIO_CONTROL(bank)                      (0x00000100 + ((bank) << 2))
  39 #define GPIO_PWD_STATUS(bank)                   (0x00000500 + ((bank) << 2))
  40
  41 #define GPIO_GPPWR_OFFSET                       0x00000520
  42
  43 #define GPIO_GPCTR0_DBR_SHIFT                   5
  44 #define GPIO_GPCTR0_DBR_MASK                    0x000001e0
  45
  46 #define GPIO_GPCTR0_ITR_SHIFT                   3
  47 #define GPIO_GPCTR0_ITR_MASK                    0x00000018
  48 #define GPIO_GPCTR0_ITR_CMD_RISING_EDGE         0x00000001
  49 #define GPIO_GPCTR0_ITR_CMD_FALLING_EDGE        0x00000002
  50 #define GPIO_GPCTR0_ITR_CMD_BOTH_EDGE           0x00000003
  51
  52 #define GPIO_GPCTR0_IOTR_MASK                   0x00000001
  53 #define GPIO_GPCTR0_IOTR_CMD_0UTPUT             0x00000000
  54 #define GPIO_GPCTR0_IOTR_CMD_INPUT              0x00000001
  55
  56 #define GPIO_GPCTR0_DB_ENABLE_MASK              0x00000100
  57
  58 #define LOCK_CODE                               0xffffffff
  59 #define UNLOCK_CODE                             0x00000000
  60
  61 struct bcm_kona_gpio {
  62         void __iomem *reg_base;
  63         int num_bank;
  64         spinlock_t lock;
  65         struct gpio_chip gpio_chip;
  66         struct irq_domain *irq_domain;
  67         struct bcm_kona_gpio_bank *banks;
  68         struct platform_device *pdev;
  69 };
  70
  71 struct bcm_kona_gpio_bank {
  72         int id;
  73         int irq;
  74         /* Used in the interrupt handler */
  75         struct bcm_kona_gpio *kona_gpio;
  76 };
  77
  78 static inline struct bcm_kona_gpio *to_kona_gpio(struct gpio_chip *chip)
  79 {
  80         return container_of(chip, struct bcm_kona_gpio, gpio_chip);
  81 }
  82
  83 static void bcm_kona_gpio_set_lockcode_bank(void __iomem *reg_base,
  84                                             int bank_id, int lockcode)
  85 {
  86         writel(BCM_GPIO_PASSWD, reg_base + GPIO_GPPWR_OFFSET);
  87         writel(lockcode, reg_base + GPIO_PWD_STATUS(bank_id));
  88 }
  89
  90 static inline void bcm_kona_gpio_lock_bank(void __iomem *reg_base, int bank_id)
  91 {
  92         bcm_kona_gpio_set_lockcode_bank(reg_base, bank_id, LOCK_CODE);
  93 }
  94
  95 static inline void bcm_kona_gpio_unlock_bank(void __iomem *reg_base,
  96                                              int bank_id)
  97 {
  98         bcm_kona_gpio_set_lockcode_bank(reg_base, bank_id, UNLOCK_CODE);
  99 }
 100
 101 static void bcm_kona_gpio_set(struct gpio_chip *chip, unsigned gpio, int value)
 102 {
 103         struct bcm_kona_gpio *kona_gpio;
 104         void __iomem *reg_base;
 105         int bank_id = GPIO_BANK(gpio);
 106         int bit = GPIO_BIT(gpio);
 107         u32 val, reg_offset;
 108         unsigned long flags;
 109
 110         kona_gpio = to_kona_gpio(chip);
 111         reg_base = kona_gpio->reg_base;
 112         spin_lock_irqsave(&kona_gpio->lock, flags);
 113         bcm_kona_gpio_unlock_bank(reg_base, bank_id);
 114
 115         /* determine the GPIO pin direction */
 116         val = readl(reg_base + GPIO_CONTROL(gpio));
 117         val &= GPIO_GPCTR0_IOTR_MASK;
 118
 119         /* this function only applies to output pin */
 120         if (GPIO_GPCTR0_IOTR_CMD_INPUT == val)
 121                 goto out;
 122
 123         reg_offset = value ? GPIO_OUT_SET(bank_id) : GPIO_OUT_CLEAR(bank_id);
 124
 125         val = readl(reg_base + reg_offset);
 126         val |= BIT(bit);
 127         writel(val, reg_base + reg_offset);
 128
 129 out:
 130         bcm_kona_gpio_lock_bank(reg_base, bank_id);
 131         spin_unlock_irqrestore(&kona_gpio->lock, flags);
 132 }
 133
 134 static int bcm_kona_gpio_get(struct gpio_chip *chip, unsigned gpio)
 135 {
 136         struct bcm_kona_gpio *kona_gpio;
 137         void __iomem *reg_base;
 138         int bank_id = GPIO_BANK(gpio);
 139         int bit = GPIO_BIT(gpio);
 140         u32 val, reg_offset;
 141         unsigned long flags;
 142
 143         kona_gpio = to_kona_gpio(chip);
 144         reg_base = kona_gpio->reg_base;
 145         spin_lock_irqsave(&kona_gpio->lock, flags);
 146         bcm_kona_gpio_unlock_bank(reg_base, bank_id);
 147
 148         /* determine the GPIO pin direction */
 149         val = readl(reg_base + GPIO_CONTROL(gpio));
 150         val &= GPIO_GPCTR0_IOTR_MASK;
 151
 152         /* read the GPIO bank status */
 153         reg_offset = (GPIO_GPCTR0_IOTR_CMD_INPUT == val) ?
 154             GPIO_IN_STATUS(bank_id) : GPIO_OUT_STATUS(bank_id);
 155         val = readl(reg_base + reg_offset);
 156
 157         bcm_kona_gpio_lock_bank(reg_base, bank_id);
 158         spin_unlock_irqrestore(&kona_gpio->lock, flags);
 159
 160         /* return the specified bit status */
 161         return !!(val & bit);
 162 }
 163
 164 static int bcm_kona_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
 165 {
 166         struct bcm_kona_gpio *kona_gpio;
 167         void __iomem *reg_base;
 168         u32 val;
 169         unsigned long flags;
 170         int bank_id = GPIO_BANK(gpio);
 171
 172         kona_gpio = to_kona_gpio(chip);
 173         reg_base = kona_gpio->reg_base;
 174         spin_lock_irqsave(&kona_gpio->lock, flags);
 175         bcm_kona_gpio_unlock_bank(reg_base, bank_id);
 176
 177         val = readl(reg_base + GPIO_CONTROL(gpio));
 178         val &= ~GPIO_GPCTR0_IOTR_MASK;
 179         val |= GPIO_GPCTR0_IOTR_CMD_INPUT;
 180         writel(val, reg_base + GPIO_CONTROL(gpio));
 181
 182         bcm_kona_gpio_lock_bank(reg_base, bank_id);
 183         spin_unlock_irqrestore(&kona_gpio->lock, flags);
 184
 185         return 0;
 186 }
 187
 188 static int bcm_kona_gpio_direction_output(struct gpio_chip *chip,
 189                                           unsigned gpio, int value)
 190 {
 191         struct bcm_kona_gpio *kona_gpio;
 192         void __iomem *reg_base;
 193         int bank_id = GPIO_BANK(gpio);
 194         int bit = GPIO_BIT(gpio);
 195         u32 val, reg_offset;
 196         unsigned long flags;
 197
 198         kona_gpio = to_kona_gpio(chip);
 199         reg_base = kona_gpio->reg_base;
 200         spin_lock_irqsave(&kona_gpio->lock, flags);
 201         bcm_kona_gpio_unlock_bank(reg_base, bank_id);
 202
 203         val = readl(reg_base + GPIO_CONTROL(gpio));
 204         val &= ~GPIO_GPCTR0_IOTR_MASK;
 205         val |= GPIO_GPCTR0_IOTR_CMD_0UTPUT;
 206         writel(val, reg_base + GPIO_CONTROL(gpio));
 207         reg_offset = value ? GPIO_OUT_SET(bank_id) : GPIO_OUT_CLEAR(bank_id);
 208
 209         val = readl(reg_base + reg_offset);
 210         val |= BIT(bit);
 211         writel(val, reg_base + reg_offset);
 212
 213         bcm_kona_gpio_lock_bank(reg_base, bank_id);
 214         spin_unlock_irqrestore(&kona_gpio->lock, flags);
 215
 216         return 0;
 217 }
 218
 219 static int bcm_kona_gpio_to_irq(struct gpio_chip *chip, unsigned gpio)
 220 {
 221         struct bcm_kona_gpio *kona_gpio;
 222
 223         kona_gpio = to_kona_gpio(chip);
 224         if (gpio >= kona_gpio->gpio_chip.ngpio)
 225                 return -ENXIO;
 226         return irq_create_mapping(kona_gpio->irq_domain, gpio);
 227 }
 228
 229 static int bcm_kona_gpio_set_debounce(struct gpio_chip *chip, unsigned gpio,
 230                                       unsigned debounce)
 231 {
 232         struct bcm_kona_gpio *kona_gpio;
 233         void __iomem *reg_base;
 234         u32 val, res;
 235         unsigned long flags;
 236         int bank_id = GPIO_BANK(gpio);
 237
 238         kona_gpio = to_kona_gpio(chip);
 239         reg_base = kona_gpio->reg_base;
 240         /* debounce must be 1-128ms (or 0) */
 241         if ((debounce > 0 && debounce < 1000) || debounce > 128000) {
 242                 dev_err(chip->dev, "Debounce value %u not in range\n",
 243                         debounce);
 244                 return -EINVAL;
 245         }
 246
 247         /* calculate debounce bit value */
 248         if (debounce != 0) {
 249                 /* Convert to ms */
 250                 debounce /= 1000;
 251                 /* find the MSB */
 252                 res = fls(debounce) - 1;
 253                 /* Check if MSB-1 is set (round up or down) */
 254                 if (res > 0 && (debounce & BIT(res - 1)))
 255                         res++;
 256         }
 257
 258         /* spin lock for read-modify-write of the GPIO register */
 259         spin_lock_irqsave(&kona_gpio->lock, flags);
 260         bcm_kona_gpio_unlock_bank(reg_base, bank_id);
 261
 262         val = readl(reg_base + GPIO_CONTROL(gpio));
 263         val &= ~GPIO_GPCTR0_DBR_MASK;
 264
 265         if (debounce == 0) {
 266                 /* disable debounce */
 267                 val &= ~GPIO_GPCTR0_DB_ENABLE_MASK;
 268         } else {
 269                 val |= GPIO_GPCTR0_DB_ENABLE_MASK |
 270                     (res << GPIO_GPCTR0_DBR_SHIFT);
 271         }
 272
 273         writel(val, reg_base + GPIO_CONTROL(gpio));
 274
 275         bcm_kona_gpio_lock_bank(reg_base, bank_id);
 276         spin_unlock_irqrestore(&kona_gpio->lock, flags);
 277
 278         return 0;
 279 }
 280
 281 static struct gpio_chip template_chip = {
 282         .label = "bcm-kona-gpio",
 283         .owner = THIS_MODULE,
 284         .direction_input = bcm_kona_gpio_direction_input,
 285         .get = bcm_kona_gpio_get,
 286         .direction_output = bcm_kona_gpio_direction_output,
 287         .set = bcm_kona_gpio_set,
 288         .set_debounce = bcm_kona_gpio_set_debounce,
 289         .to_irq = bcm_kona_gpio_to_irq,
 290         .base = 0,
 291 };
 292
 293 static void bcm_kona_gpio_irq_ack(struct irq_data *d)
 294 {
 295         struct bcm_kona_gpio *kona_gpio;
 296         void __iomem *reg_base;
 297         int gpio = d->hwirq;
 298         int bank_id = GPIO_BANK(gpio);
 299         int bit = GPIO_BIT(gpio);
 300         u32 val;
 301         unsigned long flags;
 302
 303         kona_gpio = irq_data_get_irq_chip_data(d);
 304         reg_base = kona_gpio->reg_base;
 305         spin_lock_irqsave(&kona_gpio->lock, flags);
 306         bcm_kona_gpio_unlock_bank(reg_base, bank_id);
 307
 308         val = readl(reg_base + GPIO_INT_STATUS(bank_id));
 309         val |= BIT(bit);
 310         writel(val, reg_base + GPIO_INT_STATUS(bank_id));
 311
 312         bcm_kona_gpio_lock_bank(reg_base, bank_id);
 313         spin_unlock_irqrestore(&kona_gpio->lock, flags);
 314 }
 315
 316 static void bcm_kona_gpio_irq_mask(struct irq_data *d)
 317 {
 318         struct bcm_kona_gpio *kona_gpio;
 319         void __iomem *reg_base;
 320         int gpio = d->hwirq;
 321         int bank_id = GPIO_BANK(gpio);
 322         int bit = GPIO_BIT(gpio);
 323         u32 val;
 324         unsigned long flags;
 325
 326         kona_gpio = irq_data_get_irq_chip_data(d);
 327         reg_base = kona_gpio->reg_base;
 328         spin_lock_irqsave(&kona_gpio->lock, flags);
 329         bcm_kona_gpio_unlock_bank(reg_base, bank_id);
 330
 331         val = readl(reg_base + GPIO_INT_MASK(bank_id));
 332         val |= BIT(bit);
 333         writel(val, reg_base + GPIO_INT_MASK(bank_id));
 334
 335         bcm_kona_gpio_lock_bank(reg_base, bank_id);
 336         spin_unlock_irqrestore(&kona_gpio->lock, flags);
 337 }
 338
 339 static void bcm_kona_gpio_irq_unmask(struct irq_data *d)
 340 {
 341         struct bcm_kona_gpio *kona_gpio;
 342         void __iomem *reg_base;
 343         int gpio = d->hwirq;
 344         int bank_id = GPIO_BANK(gpio);
 345         int bit = GPIO_BIT(gpio);
 346         u32 val;
 347         unsigned long flags;
 348
 349         kona_gpio = irq_data_get_irq_chip_data(d);
 350         reg_base = kona_gpio->reg_base;
 351         spin_lock_irqsave(&kona_gpio->lock, flags);
 352         bcm_kona_gpio_unlock_bank(reg_base, bank_id);
 353
 354         val = readl(reg_base + GPIO_INT_MSKCLR(bank_id));
 355         val |= BIT(bit);
 356         writel(val, reg_base + GPIO_INT_MSKCLR(bank_id));
 357
 358         bcm_kona_gpio_lock_bank(reg_base, bank_id);
 359         spin_unlock_irqrestore(&kona_gpio->lock, flags);
 360 }
 361
 362 static int bcm_kona_gpio_irq_set_type(struct irq_data *d, unsigned int type)
 363 {
 364         struct bcm_kona_gpio *kona_gpio;
 365         void __iomem *reg_base;
 366         int gpio = d->hwirq;
 367         u32 lvl_type;
 368         u32 val;
 369         unsigned long flags;
 370         int bank_id = GPIO_BANK(gpio);
 371
 372         kona_gpio = irq_data_get_irq_chip_data(d);
 373         reg_base = kona_gpio->reg_base;
 374         switch (type & IRQ_TYPE_SENSE_MASK) {
 375         case IRQ_TYPE_EDGE_RISING:
 376                 lvl_type = GPIO_GPCTR0_ITR_CMD_RISING_EDGE;
 377                 break;
 378
 379         case IRQ_TYPE_EDGE_FALLING:
 380                 lvl_type = GPIO_GPCTR0_ITR_CMD_FALLING_EDGE;
 381                 break;
 382
 383         case IRQ_TYPE_EDGE_BOTH:
 384                 lvl_type = GPIO_GPCTR0_ITR_CMD_BOTH_EDGE;
 385                 break;
 386
 387         case IRQ_TYPE_LEVEL_HIGH:
 388         case IRQ_TYPE_LEVEL_LOW:
 389                 /* BCM GPIO doesn't support level triggering */
 390         default:
 391                 dev_err(kona_gpio->gpio_chip.dev,
 392                         "Invalid BCM GPIO irq type 0x%x\n", type);
 393                 return -EINVAL;
 394         }
 395
 396         spin_lock_irqsave(&kona_gpio->lock, flags);
 397         bcm_kona_gpio_unlock_bank(reg_base, bank_id);
 398
 399         val = readl(reg_base + GPIO_CONTROL(gpio));
 400         val &= ~GPIO_GPCTR0_ITR_MASK;
 401         val |= lvl_type << GPIO_GPCTR0_ITR_SHIFT;
 402         writel(val, reg_base + GPIO_CONTROL(gpio));
 403
 404         bcm_kona_gpio_lock_bank(reg_base, bank_id);
 405         spin_unlock_irqrestore(&kona_gpio->lock, flags);
 406
 407         return 0;
 408 }
 409
 410 static void bcm_kona_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
 411 {
 412         void __iomem *reg_base;
 413         int bit, bank_id;
 414         unsigned long sta;
 415         struct bcm_kona_gpio_bank *bank = irq_get_handler_data(irq);
 416         struct irq_chip *chip = irq_desc_get_chip(desc);
 417
 418         chained_irq_enter(chip, desc);
 419
 420         /*
 421          * For bank interrupts, we can't use chip_data to store the kona_gpio
 422          * pointer, since GIC needs it for its own purposes. Therefore, we get
 423          * our pointer from the bank structure.
 424          */
 425         reg_base = bank->kona_gpio->reg_base;
 426         bank_id = bank->id;
 427         bcm_kona_gpio_unlock_bank(reg_base, bank_id);
 428
 429         while ((sta = readl(reg_base + GPIO_INT_STATUS(bank_id)) &
 430                     (~(readl(reg_base + GPIO_INT_MASK(bank_id)))))) {
 431                 for_each_set_bit(bit, &sta, 32) {
 432                         int hwirq = GPIO_PER_BANK * bank_id + bit;
 433                         int child_irq =
 434                                 irq_find_mapping(bank->kona_gpio->irq_domain,
 435                                                  hwirq);
 436                         /*
 437                          * Clear interrupt before handler is called so we don't
 438                          * miss any interrupt occurred during executing them.
 439                          */
 440                         writel(readl(reg_base + GPIO_INT_STATUS(bank_id)) |
 441                                BIT(bit), reg_base + GPIO_INT_STATUS(bank_id));
 442                         /* Invoke interrupt handler */
 443                         generic_handle_irq(child_irq);
 444                 }
 445         }
 446
 447         bcm_kona_gpio_lock_bank(reg_base, bank_id);
 448
 449         chained_irq_exit(chip, desc);
 450 }
 451
 452 static struct irq_chip bcm_gpio_irq_chip = {
 453         .name = "bcm-kona-gpio",
 454         .irq_ack = bcm_kona_gpio_irq_ack,
 455         .irq_mask = bcm_kona_gpio_irq_mask,
 456         .irq_unmask = bcm_kona_gpio_irq_unmask,
 457         .irq_set_type = bcm_kona_gpio_irq_set_type,
 458 };
 459
 460 static struct __initconst of_device_id bcm_kona_gpio_of_match[] = {
 461         { .compatible = "brcm,kona-gpio" },
 462         {}
 463 };
 464
 465 MODULE_DEVICE_TABLE(of, bcm_kona_gpio_of_match);
 466
 467 /*
 468  * This lock class tells lockdep that GPIO irqs are in a different
 469  * category than their parents, so it won't report false recursion.
 470  */
 471 static struct lock_class_key gpio_lock_class;
 472
 473 static int bcm_kona_gpio_irq_map(struct irq_domain *d, unsigned int irq,
 474                                  irq_hw_number_t hwirq)
 475 {
 476         int ret;
 477
 478         ret = irq_set_chip_data(irq, d->host_data);
 479         if (ret < 0)
 480                 return ret;
 481         irq_set_lockdep_class(irq, &gpio_lock_class);
 482         irq_set_chip_and_handler(irq, &bcm_gpio_irq_chip, handle_simple_irq);
 483 #ifdef CONFIG_ARM
 484         set_irq_flags(irq, IRQF_VALID);
 485 #else
 486         irq_set_noprobe(irq);
 487 #endif
 488
 489         return 0;
 490 }
 491
 492 static void bcm_kona_gpio_irq_unmap(struct irq_domain *d, unsigned int irq)
 493 {
 494         irq_set_chip_and_handler(irq, NULL, NULL);
 495         irq_set_chip_data(irq, NULL);
 496 }
 497
 498 static struct irq_domain_ops bcm_kona_irq_ops = {
 499         .map = bcm_kona_gpio_irq_map,
 500         .unmap = bcm_kona_gpio_irq_unmap,
 501         .xlate = irq_domain_xlate_twocell,
 502 };
 503
 504 static void bcm_kona_gpio_reset(struct bcm_kona_gpio *kona_gpio)
 505 {
 506         void __iomem *reg_base;
 507         int i;
 508
 509         reg_base = kona_gpio->reg_base;
 510         /* disable interrupts and clear status */
 511         for (i = 0; i < kona_gpio->num_bank; i++) {
 512                 bcm_kona_gpio_unlock_bank(reg_base, i);
 513                 writel(0xffffffff, reg_base + GPIO_INT_MASK(i));
 514                 writel(0xffffffff, reg_base + GPIO_INT_STATUS(i));
 515                 bcm_kona_gpio_lock_bank(reg_base, i);
 516         }
 517 }
 518
 519 static int bcm_kona_gpio_probe(struct platform_device *pdev)
 520 {
 521         struct device *dev = &pdev->dev;
 522         const struct of_device_id *match;
 523         struct resource *res;
 524         struct bcm_kona_gpio_bank *bank;
 525         struct bcm_kona_gpio *kona_gpio;
 526         struct gpio_chip *chip;
 527         int ret;
 528         int i;
 529
 530         match = of_match_device(bcm_kona_gpio_of_match, dev);
 531         if (!match) {
 532                 dev_err(dev, "Failed to find gpio controller\n");
 533                 return -ENODEV;
 534         }
 535
 536         kona_gpio = devm_kzalloc(dev, sizeof(*kona_gpio), GFP_KERNEL);
 537         if (!kona_gpio)
 538                 return -ENOMEM;
 539
 540         kona_gpio->gpio_chip = template_chip;
 541         chip = &kona_gpio->gpio_chip;
 542         kona_gpio->num_bank = of_irq_count(dev->of_node);
 543         if (kona_gpio->num_bank == 0) {
 544                 dev_err(dev, "Couldn't determine # GPIO banks\n");
 545                 return -ENOENT;
 546         }
 547         if (kona_gpio->num_bank > GPIO_MAX_BANK_NUM) {
 548                 dev_err(dev, "Too many GPIO banks configured (max=%d)\n",
 549                         GPIO_MAX_BANK_NUM);
 550                 return -ENXIO;
 551         }
 552         kona_gpio->banks = devm_kzalloc(dev,
 553                                         kona_gpio->num_bank *
 554                                         sizeof(*kona_gpio->banks), GFP_KERNEL);
 555         if (!kona_gpio->banks)
 556                 return -ENOMEM;
 557
 558         kona_gpio->pdev = pdev;
 559         platform_set_drvdata(pdev, kona_gpio);
 560         chip->of_node = dev->of_node;
 561         chip->ngpio = kona_gpio->num_bank * GPIO_PER_BANK;
 562
 563         kona_gpio->irq_domain = irq_domain_add_linear(dev->of_node,
 564                                                       chip->ngpio,
 565                                                       &bcm_kona_irq_ops,
 566                                                       kona_gpio);
 567         if (!kona_gpio->irq_domain) {
 568                 dev_err(dev, "Couldn't allocate IRQ domain\n");
 569                 return -ENXIO;
 570         }
 571
 572         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 573         kona_gpio->reg_base = devm_ioremap_resource(dev, res);
 574         if (IS_ERR(kona_gpio->reg_base)) {
 575                 ret = -ENXIO;
 576                 goto err_irq_domain;
 577         }
 578
 579         for (i = 0; i < kona_gpio->num_bank; i++) {
 580                 bank = &kona_gpio->banks[i];
 581                 bank->id = i;
 582                 bank->irq = platform_get_irq(pdev, i);
 583                 bank->kona_gpio = kona_gpio;
 584                 if (bank->irq < 0) {
 585                         dev_err(dev, "Couldn't get IRQ for bank %d", i);
 586                         ret = -ENOENT;
 587                         goto err_irq_domain;
 588                 }
 589         }
 590
 591         dev_info(&pdev->dev, "Setting up Kona GPIO\n");
 592
 593         bcm_kona_gpio_reset(kona_gpio);
 594
 595         ret = gpiochip_add(chip);
 596         if (ret < 0) {
 597                 dev_err(dev, "Couldn't add GPIO chip -- %d\n", ret);
 598                 goto err_irq_domain;
 599         }
 600         for (i = 0; i < chip->ngpio; i++) {
 601                 int irq = bcm_kona_gpio_to_irq(chip, i);
 602                 irq_set_lockdep_class(irq, &gpio_lock_class);
 603                 irq_set_chip_and_handler(irq, &bcm_gpio_irq_chip,
 604                                          handle_simple_irq);
 605 #ifdef CONFIG_ARM
 606                 set_irq_flags(irq, IRQF_VALID);
 607 #else
 608                 irq_set_noprobe(irq);
 609 #endif
 610         }
 611         for (i = 0; i < kona_gpio->num_bank; i++) {
 612                 bank = &kona_gpio->banks[i];
 613                 irq_set_chained_handler(bank->irq, bcm_kona_gpio_irq_handler);
 614                 irq_set_handler_data(bank->irq, bank);
 615         }
 616
 617         spin_lock_init(&kona_gpio->lock);
 618
 619         return 0;
 620
 621 err_irq_domain:
 622         irq_domain_remove(kona_gpio->irq_domain);
 623
 624         return ret;
 625 }
 626
 627 static struct platform_driver bcm_kona_gpio_driver = {
 628         .driver = {
 629                         .name = "bcm-kona-gpio",
 630                         .owner = THIS_MODULE,
 631                         .of_match_table = bcm_kona_gpio_of_match,
 632         },
 633         .probe = bcm_kona_gpio_probe,
 634 };
 635
 636 module_platform_driver(bcm_kona_gpio_driver);
 637
 638 MODULE_AUTHOR("Broadcom");
 639 MODULE_DESCRIPTION("Broadcom Kona GPIO Driver");
 640 MODULE_LICENSE("GPL v2");