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)); 376 377 raw_spin_unlock_irqrestore(&kona_gpio->lock, flags); 378 } 379 380 static void bcm_kona_gpio_irq_unmask(struct irq_data *d) 381 { 382 struct bcm_kona_gpio *kona_gpio; 383 void __iomem *reg_base; 384 unsigned gpio = d->hwirq; 385 int bank_id = GPIO_BANK(gpio); 386 int bit = GPIO_BIT(gpio); 387 u32 val; 388 unsigned long flags; 389 390 kona_gpio = irq_data_get_irq_chip_data(d); 391 reg_base = kona_gpio->reg_base; 392 raw_spin_lock_irqsave(&kona_gpio->lock, flags); 393 394 val = readl(reg_base + GPIO_INT_MSKCLR(bank_id)); 395 val |= BIT(bit); 396 writel(val, reg_base + GPIO_INT_MSKCLR(bank_id)); 397 398 raw_spin_unlock_irqrestore(&kona_gpio->lock, flags); 399 } 400 401 static int bcm_kona_gpio_irq_set_type(struct irq_data *d, unsigned int type) 402 { 403 struct bcm_kona_gpio *kona_gpio; 404 void __iomem *reg_base; 405 unsigned gpio = d->hwirq; 406 u32 lvl_type; 407 u32 val; 408 unsigned long flags; 409 410 kona_gpio = irq_data_get_irq_chip_data(d); 411 reg_base = kona_gpio->reg_base; 412 switch (type & IRQ_TYPE_SENSE_MASK) { 413 case IRQ_TYPE_EDGE_RISING: 414 lvl_type = GPIO_GPCTR0_ITR_CMD_RISING_EDGE; 415 break; 416 417 case IRQ_TYPE_EDGE_FALLING: 418 lvl_type = GPIO_GPCTR0_ITR_CMD_FALLING_EDGE; 419 break; 420 421 case IRQ_TYPE_EDGE_BOTH: 422 lvl_type = GPIO_GPCTR0_ITR_CMD_BOTH_EDGE; 423 break; 424 425 case IRQ_TYPE_LEVEL_HIGH: 426 case IRQ_TYPE_LEVEL_LOW: 427 /* BCM GPIO doesn't support level triggering */ 428 default: 429 dev_err(kona_gpio->gpio_chip.parent, 430 "Invalid BCM GPIO irq type 0x%x\n", type); 431 return -EINVAL; 432 } 433 434 raw_spin_lock_irqsave(&kona_gpio->lock, flags); 435 436 val = readl(reg_base + GPIO_CONTROL(gpio)); 437 val &= ~GPIO_GPCTR0_ITR_MASK; 438 val |= lvl_type << GPIO_GPCTR0_ITR_SHIFT; 439 writel(val, reg_base + GPIO_CONTROL(gpio)); 440 441 raw_spin_unlock_irqrestore(&kona_gpio->lock, flags); 442 443 return 0; 444 } 445 446 static void bcm_kona_gpio_irq_handler(struct irq_desc *desc) 447 { 448 void __iomem *reg_base; 449 int bit, bank_id; 450 unsigned long sta; 451 struct bcm_kona_gpio_bank *bank = irq_desc_get_handler_data(desc); 452 struct irq_chip *chip = irq_desc_get_chip(desc); 453 454 chained_irq_enter(chip, desc); 455 456 /* 457 * For bank interrupts, we can't use chip_data to store the kona_gpio 458 * pointer, since GIC needs it for its own purposes. Therefore, we get 459 * our pointer from the bank structure. 460 */ 461 reg_base = bank->kona_gpio->reg_base; 462 bank_id = bank->id; 463 464 while ((sta = readl(reg_base + GPIO_INT_STATUS(bank_id)) & 465 (~(readl(reg_base + GPIO_INT_MASK(bank_id)))))) { 466 for_each_set_bit(bit, &sta, 32) { 467 int hwirq = GPIO_PER_BANK * bank_id + bit; 468 int child_irq = 469 irq_find_mapping(bank->kona_gpio->irq_domain, 470 hwirq); 471 /* 472 * Clear interrupt before handler is called so we don't 473 * miss any interrupt occurred during executing them. 474 */ 475 writel(readl(reg_base + GPIO_INT_STATUS(bank_id)) | 476 BIT(bit), reg_base + GPIO_INT_STATUS(bank_id)); 477 /* Invoke interrupt handler */ 478 generic_handle_irq(child_irq); 479 } 480 } 481 482 chained_irq_exit(chip, desc); 483 } 484 485 static int bcm_kona_gpio_irq_reqres(struct irq_data *d) 486 { 487 struct bcm_kona_gpio *kona_gpio = irq_data_get_irq_chip_data(d); 488 int ret; 489 490 ret = gpiochip_lock_as_irq(&kona_gpio->gpio_chip, d->hwirq); 491 if (ret) { 492 dev_err(kona_gpio->gpio_chip.parent, 493 "unable to lock HW IRQ %lu for IRQ\n", 494 d->hwirq); 495 return ret; 496 } 497 return 0; 498 } 499 500 static void bcm_kona_gpio_irq_relres(struct irq_data *d) 501 { 502 struct bcm_kona_gpio *kona_gpio = irq_data_get_irq_chip_data(d); 503 504 gpiochip_unlock_as_irq(&kona_gpio->gpio_chip, d->hwirq); 505 } 506 507 static struct irq_chip bcm_gpio_irq_chip = { 508 .name = "bcm-kona-gpio", 509 .irq_ack = bcm_kona_gpio_irq_ack, 510 .irq_mask = bcm_kona_gpio_irq_mask, 511 .irq_unmask = bcm_kona_gpio_irq_unmask, 512 .irq_set_type = bcm_kona_gpio_irq_set_type, 513 .irq_request_resources = bcm_kona_gpio_irq_reqres, 514 .irq_release_resources = bcm_kona_gpio_irq_relres, 515 }; 516 517 static struct of_device_id const bcm_kona_gpio_of_match[] = { 518 { .compatible = "brcm,kona-gpio" }, 519 {} 520 }; 521 522 /* 523 * This lock class tells lockdep that GPIO irqs are in a different 524 * category than their parents, so it won't report false recursion. 525 */ 526 static struct lock_class_key gpio_lock_class; 527 static struct lock_class_key gpio_request_class; 528 529 static int bcm_kona_gpio_irq_map(struct irq_domain *d, unsigned int irq, 530 irq_hw_number_t hwirq) 531 { 532 int ret; 533 534 ret = irq_set_chip_data(irq, d->host_data); 535 if (ret < 0) 536 return ret; 537 irq_set_lockdep_class(irq, &gpio_lock_class, &gpio_request_class); 538 irq_set_chip_and_handler(irq, &bcm_gpio_irq_chip, handle_simple_irq); 539 irq_set_noprobe(irq); 540 541 return 0; 542 } 543 544 static void bcm_kona_gpio_irq_unmap(struct irq_domain *d, unsigned int irq) 545 { 546 irq_set_chip_and_handler(irq, NULL, NULL); 547 irq_set_chip_data(irq, NULL); 548 } 549 550 static const struct irq_domain_ops bcm_kona_irq_ops = { 551 .map = bcm_kona_gpio_irq_map, 552 .unmap = bcm_kona_gpio_irq_unmap, 553 .xlate = irq_domain_xlate_twocell, 554 }; 555 556 static void bcm_kona_gpio_reset(struct bcm_kona_gpio *kona_gpio) 557 { 558 void __iomem *reg_base; 559 int i; 560 561 reg_base = kona_gpio->reg_base; 562 /* disable interrupts and clear status */ 563 for (i = 0; i < kona_gpio->num_bank; i++) { 564 /* Unlock the entire bank first */ 565 bcm_kona_gpio_write_lock_regs(reg_base, i, UNLOCK_CODE); 566 writel(0xffffffff, reg_base + GPIO_INT_MASK(i)); 567 writel(0xffffffff, reg_base + GPIO_INT_STATUS(i)); 568 /* Now re-lock the bank */ 569 bcm_kona_gpio_write_lock_regs(reg_base, i, LOCK_CODE); 570 } 571 } 572 573 static int bcm_kona_gpio_probe(struct platform_device *pdev) 574 { 575 struct device *dev = &pdev->dev; 576 const struct of_device_id *match; 577 struct resource *res; 578 struct bcm_kona_gpio_bank *bank; 579 struct bcm_kona_gpio *kona_gpio; 580 struct gpio_chip *chip; 581 int ret; 582 int i; 583 584 match = of_match_device(bcm_kona_gpio_of_match, dev); 585 if (!match) { 586 dev_err(dev, "Failed to find gpio controller\n"); 587 return -ENODEV; 588 } 589 590 kona_gpio = devm_kzalloc(dev, sizeof(*kona_gpio), GFP_KERNEL); 591 if (!kona_gpio) 592 return -ENOMEM; 593 594 kona_gpio->gpio_chip = template_chip; 595 chip = &kona_gpio->gpio_chip; 596 kona_gpio->num_bank = of_irq_count(dev->of_node); 597 if (kona_gpio->num_bank == 0) { 598 dev_err(dev, "Couldn't determine # GPIO banks\n"); 599 return -ENOENT; 600 } 601 if (kona_gpio->num_bank > GPIO_MAX_BANK_NUM) { 602 dev_err(dev, "Too many GPIO banks configured (max=%d)\n", 603 GPIO_MAX_BANK_NUM); 604 return -ENXIO; 605 } 606 kona_gpio->banks = devm_kcalloc(dev, 607 kona_gpio->num_bank, 608 sizeof(*kona_gpio->banks), 609 GFP_KERNEL); 610 if (!kona_gpio->banks) 611 return -ENOMEM; 612 613 kona_gpio->pdev = pdev; 614 platform_set_drvdata(pdev, kona_gpio); 615 chip->of_node = dev->of_node; 616 chip->ngpio = kona_gpio->num_bank * GPIO_PER_BANK; 617 618 kona_gpio->irq_domain = irq_domain_add_linear(dev->of_node, 619 chip->ngpio, 620 &bcm_kona_irq_ops, 621 kona_gpio); 622 if (!kona_gpio->irq_domain) { 623 dev_err(dev, "Couldn't allocate IRQ domain\n"); 624 return -ENXIO; 625 } 626 627 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 628 kona_gpio->reg_base = devm_ioremap_resource(dev, res); 629 if (IS_ERR(kona_gpio->reg_base)) { 630 ret = -ENXIO; 631 goto err_irq_domain; 632 } 633 634 for (i = 0; i < kona_gpio->num_bank; i++) { 635 bank = &kona_gpio->banks[i]; 636 bank->id = i; 637 bank->irq = platform_get_irq(pdev, i); 638 bank->kona_gpio = kona_gpio; 639 if (bank->irq < 0) { 640 dev_err(dev, "Couldn't get IRQ for bank %d", i); 641 ret = -ENOENT; 642 goto err_irq_domain; 643 } 644 } 645 646 dev_info(&pdev->dev, "Setting up Kona GPIO\n"); 647 648 bcm_kona_gpio_reset(kona_gpio); 649 650 ret = devm_gpiochip_add_data(dev, chip, kona_gpio); 651 if (ret < 0) { 652 dev_err(dev, "Couldn't add GPIO chip -- %d\n", ret); 653 goto err_irq_domain; 654 } 655 for (i = 0; i < kona_gpio->num_bank; i++) { 656 bank = &kona_gpio->banks[i]; 657 irq_set_chained_handler_and_data(bank->irq, 658 bcm_kona_gpio_irq_handler, 659 bank); 660 } 661 662 raw_spin_lock_init(&kona_gpio->lock); 663 664 return 0; 665 666 err_irq_domain: 667 irq_domain_remove(kona_gpio->irq_domain); 668 669 return ret; 670 } 671 672 static struct platform_driver bcm_kona_gpio_driver = { 673 .driver = { 674 .name = "bcm-kona-gpio", 675 .of_match_table = bcm_kona_gpio_of_match, 676 }, 677 .probe = bcm_kona_gpio_probe, 678 }; 679 builtin_platform_driver(bcm_kona_gpio_driver); 680