1 /* 2 * Copyright (C) 2014-2017 Broadcom 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 /* 15 * This file contains the Broadcom Northstar Plus (NSP) GPIO driver that 16 * supports the chipCommonA GPIO controller. Basic PINCONF such as bias, 17 * pull up/down, slew and drive strength are also supported in this driver. 18 * 19 * Pins from the chipCommonA GPIO can be individually muxed to GPIO function, 20 * through the interaction with the NSP IOMUX controller. 21 */ 22 23 #include <linux/gpio/driver.h> 24 #include <linux/interrupt.h> 25 #include <linux/io.h> 26 #include <linux/ioport.h> 27 #include <linux/kernel.h> 28 #include <linux/of_address.h> 29 #include <linux/of_device.h> 30 #include <linux/of_irq.h> 31 #include <linux/pinctrl/pinconf.h> 32 #include <linux/pinctrl/pinconf-generic.h> 33 #include <linux/pinctrl/pinctrl.h> 34 #include <linux/slab.h> 35 36 #include "../pinctrl-utils.h" 37 38 #define NSP_CHIP_A_INT_STATUS 0x00 39 #define NSP_CHIP_A_INT_MASK 0x04 40 #define NSP_GPIO_DATA_IN 0x40 41 #define NSP_GPIO_DATA_OUT 0x44 42 #define NSP_GPIO_OUT_EN 0x48 43 #define NSP_GPIO_INT_POLARITY 0x50 44 #define NSP_GPIO_INT_MASK 0x54 45 #define NSP_GPIO_EVENT 0x58 46 #define NSP_GPIO_EVENT_INT_MASK 0x5c 47 #define NSP_GPIO_EVENT_INT_POLARITY 0x64 48 #define NSP_CHIP_A_GPIO_INT_BIT 0x01 49 50 /* I/O parameters offset for chipcommon A GPIO */ 51 #define NSP_GPIO_DRV_CTRL 0x00 52 #define NSP_GPIO_HYSTERESIS_EN 0x10 53 #define NSP_GPIO_SLEW_RATE_EN 0x14 54 #define NSP_PULL_UP_EN 0x18 55 #define NSP_PULL_DOWN_EN 0x1c 56 #define GPIO_DRV_STRENGTH_BITS 0x03 57 58 /* 59 * nsp GPIO core 60 * 61 * @dev: pointer to device 62 * @base: I/O register base for nsp GPIO controller 63 * @io_ctrl: I/O register base for PINCONF support outside the GPIO block 64 * @gc: GPIO chip 65 * @pctl: pointer to pinctrl_dev 66 * @pctldesc: pinctrl descriptor 67 * @lock: lock to protect access to I/O registers 68 */ 69 struct nsp_gpio { 70 struct device *dev; 71 void __iomem *base; 72 void __iomem *io_ctrl; 73 struct irq_chip irqchip; 74 struct gpio_chip gc; 75 struct pinctrl_dev *pctl; 76 struct pinctrl_desc pctldesc; 77 raw_spinlock_t lock; 78 }; 79 80 enum base_type { 81 REG, 82 IO_CTRL 83 }; 84 85 /* 86 * Mapping from PINCONF pins to GPIO pins is 1-to-1 87 */ 88 static inline unsigned nsp_pin_to_gpio(unsigned pin) 89 { 90 return pin; 91 } 92 93 /* 94 * nsp_set_bit - set or clear one bit (corresponding to the GPIO pin) in a 95 * nsp GPIO register 96 * 97 * @nsp_gpio: nsp GPIO device 98 * @base_type: reg base to modify 99 * @reg: register offset 100 * @gpio: GPIO pin 101 * @set: set or clear 102 */ 103 static inline void nsp_set_bit(struct nsp_gpio *chip, enum base_type address, 104 unsigned int reg, unsigned gpio, bool set) 105 { 106 u32 val; 107 void __iomem *base_address; 108 109 if (address == IO_CTRL) 110 base_address = chip->io_ctrl; 111 else 112 base_address = chip->base; 113 114 val = readl(base_address + reg); 115 if (set) 116 val |= BIT(gpio); 117 else 118 val &= ~BIT(gpio); 119 120 writel(val, base_address + reg); 121 } 122 123 /* 124 * nsp_get_bit - get one bit (corresponding to the GPIO pin) in a 125 * nsp GPIO register 126 */ 127 static inline bool nsp_get_bit(struct nsp_gpio *chip, enum base_type address, 128 unsigned int reg, unsigned gpio) 129 { 130 if (address == IO_CTRL) 131 return !!(readl(chip->io_ctrl + reg) & BIT(gpio)); 132 else 133 return !!(readl(chip->base + reg) & BIT(gpio)); 134 } 135 136 static irqreturn_t nsp_gpio_irq_handler(int irq, void *data) 137 { 138 struct gpio_chip *gc = (struct gpio_chip *)data; 139 struct nsp_gpio *chip = gpiochip_get_data(gc); 140 int bit; 141 unsigned long int_bits = 0; 142 u32 int_status; 143 144 /* go through the entire GPIOs and handle all interrupts */ 145 int_status = readl(chip->base + NSP_CHIP_A_INT_STATUS); 146 if (int_status & NSP_CHIP_A_GPIO_INT_BIT) { 147 unsigned int event, level; 148 149 /* Get level and edge interrupts */ 150 event = readl(chip->base + NSP_GPIO_EVENT_INT_MASK) & 151 readl(chip->base + NSP_GPIO_EVENT); 152 level = readl(chip->base + NSP_GPIO_DATA_IN) ^ 153 readl(chip->base + NSP_GPIO_INT_POLARITY); 154 level &= readl(chip->base + NSP_GPIO_INT_MASK); 155 int_bits = level | event; 156 157 for_each_set_bit(bit, &int_bits, gc->ngpio) 158 generic_handle_domain_irq(gc->irq.domain, bit); 159 } 160 161 return int_bits ? IRQ_HANDLED : IRQ_NONE; 162 } 163 164 static void nsp_gpio_irq_ack(struct irq_data *d) 165 { 166 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 167 struct nsp_gpio *chip = gpiochip_get_data(gc); 168 unsigned gpio = d->hwirq; 169 u32 val = BIT(gpio); 170 u32 trigger_type; 171 172 trigger_type = irq_get_trigger_type(d->irq); 173 if (trigger_type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING)) 174 writel(val, chip->base + NSP_GPIO_EVENT); 175 } 176 177 /* 178 * nsp_gpio_irq_set_mask - mask/unmask a GPIO interrupt 179 * 180 * @d: IRQ chip data 181 * @unmask: mask/unmask GPIO interrupt 182 */ 183 static void nsp_gpio_irq_set_mask(struct irq_data *d, bool unmask) 184 { 185 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 186 struct nsp_gpio *chip = gpiochip_get_data(gc); 187 unsigned gpio = d->hwirq; 188 u32 trigger_type; 189 190 trigger_type = irq_get_trigger_type(d->irq); 191 if (trigger_type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING)) 192 nsp_set_bit(chip, REG, NSP_GPIO_EVENT_INT_MASK, gpio, unmask); 193 else 194 nsp_set_bit(chip, REG, NSP_GPIO_INT_MASK, gpio, unmask); 195 } 196 197 static void nsp_gpio_irq_mask(struct irq_data *d) 198 { 199 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 200 struct nsp_gpio *chip = gpiochip_get_data(gc); 201 unsigned long flags; 202 203 raw_spin_lock_irqsave(&chip->lock, flags); 204 nsp_gpio_irq_set_mask(d, false); 205 raw_spin_unlock_irqrestore(&chip->lock, flags); 206 } 207 208 static void nsp_gpio_irq_unmask(struct irq_data *d) 209 { 210 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 211 struct nsp_gpio *chip = gpiochip_get_data(gc); 212 unsigned long flags; 213 214 raw_spin_lock_irqsave(&chip->lock, flags); 215 nsp_gpio_irq_set_mask(d, true); 216 raw_spin_unlock_irqrestore(&chip->lock, flags); 217 } 218 219 static int nsp_gpio_irq_set_type(struct irq_data *d, unsigned int type) 220 { 221 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 222 struct nsp_gpio *chip = gpiochip_get_data(gc); 223 unsigned gpio = d->hwirq; 224 bool level_low; 225 bool falling; 226 unsigned long flags; 227 228 raw_spin_lock_irqsave(&chip->lock, flags); 229 falling = nsp_get_bit(chip, REG, NSP_GPIO_EVENT_INT_POLARITY, gpio); 230 level_low = nsp_get_bit(chip, REG, NSP_GPIO_INT_POLARITY, gpio); 231 232 switch (type & IRQ_TYPE_SENSE_MASK) { 233 case IRQ_TYPE_EDGE_RISING: 234 falling = false; 235 break; 236 237 case IRQ_TYPE_EDGE_FALLING: 238 falling = true; 239 break; 240 241 case IRQ_TYPE_LEVEL_HIGH: 242 level_low = false; 243 break; 244 245 case IRQ_TYPE_LEVEL_LOW: 246 level_low = true; 247 break; 248 249 default: 250 dev_err(chip->dev, "invalid GPIO IRQ type 0x%x\n", 251 type); 252 raw_spin_unlock_irqrestore(&chip->lock, flags); 253 return -EINVAL; 254 } 255 256 nsp_set_bit(chip, REG, NSP_GPIO_EVENT_INT_POLARITY, gpio, falling); 257 nsp_set_bit(chip, REG, NSP_GPIO_INT_POLARITY, gpio, level_low); 258 259 if (type & IRQ_TYPE_EDGE_BOTH) 260 irq_set_handler_locked(d, handle_edge_irq); 261 else 262 irq_set_handler_locked(d, handle_level_irq); 263 264 raw_spin_unlock_irqrestore(&chip->lock, flags); 265 266 dev_dbg(chip->dev, "gpio:%u level_low:%s falling:%s\n", gpio, 267 level_low ? "true" : "false", falling ? "true" : "false"); 268 return 0; 269 } 270 271 static int nsp_gpio_direction_input(struct gpio_chip *gc, unsigned gpio) 272 { 273 struct nsp_gpio *chip = gpiochip_get_data(gc); 274 unsigned long flags; 275 276 raw_spin_lock_irqsave(&chip->lock, flags); 277 nsp_set_bit(chip, REG, NSP_GPIO_OUT_EN, gpio, false); 278 raw_spin_unlock_irqrestore(&chip->lock, flags); 279 280 dev_dbg(chip->dev, "gpio:%u set input\n", gpio); 281 return 0; 282 } 283 284 static int nsp_gpio_direction_output(struct gpio_chip *gc, unsigned gpio, 285 int val) 286 { 287 struct nsp_gpio *chip = gpiochip_get_data(gc); 288 unsigned long flags; 289 290 raw_spin_lock_irqsave(&chip->lock, flags); 291 nsp_set_bit(chip, REG, NSP_GPIO_OUT_EN, gpio, true); 292 nsp_set_bit(chip, REG, NSP_GPIO_DATA_OUT, gpio, !!(val)); 293 raw_spin_unlock_irqrestore(&chip->lock, flags); 294 295 dev_dbg(chip->dev, "gpio:%u set output, value:%d\n", gpio, val); 296 return 0; 297 } 298 299 static int nsp_gpio_get_direction(struct gpio_chip *gc, unsigned gpio) 300 { 301 struct nsp_gpio *chip = gpiochip_get_data(gc); 302 unsigned long flags; 303 int val; 304 305 raw_spin_lock_irqsave(&chip->lock, flags); 306 val = nsp_get_bit(chip, REG, NSP_GPIO_OUT_EN, gpio); 307 raw_spin_unlock_irqrestore(&chip->lock, flags); 308 309 return !val; 310 } 311 312 static void nsp_gpio_set(struct gpio_chip *gc, unsigned gpio, int val) 313 { 314 struct nsp_gpio *chip = gpiochip_get_data(gc); 315 unsigned long flags; 316 317 raw_spin_lock_irqsave(&chip->lock, flags); 318 nsp_set_bit(chip, REG, NSP_GPIO_DATA_OUT, gpio, !!(val)); 319 raw_spin_unlock_irqrestore(&chip->lock, flags); 320 321 dev_dbg(chip->dev, "gpio:%u set, value:%d\n", gpio, val); 322 } 323 324 static int nsp_gpio_get(struct gpio_chip *gc, unsigned gpio) 325 { 326 struct nsp_gpio *chip = gpiochip_get_data(gc); 327 328 return !!(readl(chip->base + NSP_GPIO_DATA_IN) & BIT(gpio)); 329 } 330 331 static int nsp_get_groups_count(struct pinctrl_dev *pctldev) 332 { 333 return 1; 334 } 335 336 /* 337 * Only one group: "gpio_grp", since this local pinctrl device only performs 338 * GPIO specific PINCONF configurations 339 */ 340 static const char *nsp_get_group_name(struct pinctrl_dev *pctldev, 341 unsigned selector) 342 { 343 return "gpio_grp"; 344 } 345 346 static const struct pinctrl_ops nsp_pctrl_ops = { 347 .get_groups_count = nsp_get_groups_count, 348 .get_group_name = nsp_get_group_name, 349 .dt_node_to_map = pinconf_generic_dt_node_to_map_pin, 350 .dt_free_map = pinctrl_utils_free_map, 351 }; 352 353 static int nsp_gpio_set_slew(struct nsp_gpio *chip, unsigned gpio, u32 slew) 354 { 355 if (slew) 356 nsp_set_bit(chip, IO_CTRL, NSP_GPIO_SLEW_RATE_EN, gpio, true); 357 else 358 nsp_set_bit(chip, IO_CTRL, NSP_GPIO_SLEW_RATE_EN, gpio, false); 359 360 return 0; 361 } 362 363 static int nsp_gpio_set_pull(struct nsp_gpio *chip, unsigned gpio, 364 bool pull_up, bool pull_down) 365 { 366 unsigned long flags; 367 368 raw_spin_lock_irqsave(&chip->lock, flags); 369 nsp_set_bit(chip, IO_CTRL, NSP_PULL_DOWN_EN, gpio, pull_down); 370 nsp_set_bit(chip, IO_CTRL, NSP_PULL_UP_EN, gpio, pull_up); 371 raw_spin_unlock_irqrestore(&chip->lock, flags); 372 373 dev_dbg(chip->dev, "gpio:%u set pullup:%d pulldown: %d\n", 374 gpio, pull_up, pull_down); 375 return 0; 376 } 377 378 static void nsp_gpio_get_pull(struct nsp_gpio *chip, unsigned gpio, 379 bool *pull_up, bool *pull_down) 380 { 381 unsigned long flags; 382 383 raw_spin_lock_irqsave(&chip->lock, flags); 384 *pull_up = nsp_get_bit(chip, IO_CTRL, NSP_PULL_UP_EN, gpio); 385 *pull_down = nsp_get_bit(chip, IO_CTRL, NSP_PULL_DOWN_EN, gpio); 386 raw_spin_unlock_irqrestore(&chip->lock, flags); 387 } 388 389 static int nsp_gpio_set_strength(struct nsp_gpio *chip, unsigned gpio, 390 u32 strength) 391 { 392 u32 offset, shift, i; 393 u32 val; 394 unsigned long flags; 395 396 /* make sure drive strength is supported */ 397 if (strength < 2 || strength > 16 || (strength % 2)) 398 return -ENOTSUPP; 399 400 shift = gpio; 401 offset = NSP_GPIO_DRV_CTRL; 402 dev_dbg(chip->dev, "gpio:%u set drive strength:%d mA\n", gpio, 403 strength); 404 raw_spin_lock_irqsave(&chip->lock, flags); 405 strength = (strength / 2) - 1; 406 for (i = GPIO_DRV_STRENGTH_BITS; i > 0; i--) { 407 val = readl(chip->io_ctrl + offset); 408 val &= ~BIT(shift); 409 val |= ((strength >> (i-1)) & 0x1) << shift; 410 writel(val, chip->io_ctrl + offset); 411 offset += 4; 412 } 413 raw_spin_unlock_irqrestore(&chip->lock, flags); 414 415 return 0; 416 } 417 418 static int nsp_gpio_get_strength(struct nsp_gpio *chip, unsigned gpio, 419 u16 *strength) 420 { 421 unsigned int offset, shift; 422 u32 val; 423 unsigned long flags; 424 int i; 425 426 offset = NSP_GPIO_DRV_CTRL; 427 shift = gpio; 428 429 raw_spin_lock_irqsave(&chip->lock, flags); 430 *strength = 0; 431 for (i = (GPIO_DRV_STRENGTH_BITS - 1); i >= 0; i--) { 432 val = readl(chip->io_ctrl + offset) & BIT(shift); 433 val >>= shift; 434 *strength += (val << i); 435 offset += 4; 436 } 437 438 /* convert to mA */ 439 *strength = (*strength + 1) * 2; 440 raw_spin_unlock_irqrestore(&chip->lock, flags); 441 442 return 0; 443 } 444 445 static int nsp_pin_config_group_get(struct pinctrl_dev *pctldev, 446 unsigned selector, 447 unsigned long *config) 448 { 449 return 0; 450 } 451 452 static int nsp_pin_config_group_set(struct pinctrl_dev *pctldev, 453 unsigned selector, 454 unsigned long *configs, unsigned num_configs) 455 { 456 return 0; 457 } 458 459 static int nsp_pin_config_get(struct pinctrl_dev *pctldev, unsigned pin, 460 unsigned long *config) 461 { 462 struct nsp_gpio *chip = pinctrl_dev_get_drvdata(pctldev); 463 enum pin_config_param param = pinconf_to_config_param(*config); 464 unsigned int gpio; 465 u16 arg = 0; 466 bool pull_up, pull_down; 467 int ret; 468 469 gpio = nsp_pin_to_gpio(pin); 470 switch (param) { 471 case PIN_CONFIG_BIAS_DISABLE: 472 nsp_gpio_get_pull(chip, gpio, &pull_up, &pull_down); 473 if ((pull_up == false) && (pull_down == false)) 474 return 0; 475 else 476 return -EINVAL; 477 478 case PIN_CONFIG_BIAS_PULL_UP: 479 nsp_gpio_get_pull(chip, gpio, &pull_up, &pull_down); 480 if (pull_up) 481 return 0; 482 else 483 return -EINVAL; 484 485 case PIN_CONFIG_BIAS_PULL_DOWN: 486 nsp_gpio_get_pull(chip, gpio, &pull_up, &pull_down); 487 if (pull_down) 488 return 0; 489 else 490 return -EINVAL; 491 492 case PIN_CONFIG_DRIVE_STRENGTH: 493 ret = nsp_gpio_get_strength(chip, gpio, &arg); 494 if (ret) 495 return ret; 496 *config = pinconf_to_config_packed(param, arg); 497 return 0; 498 499 default: 500 return -ENOTSUPP; 501 } 502 } 503 504 static int nsp_pin_config_set(struct pinctrl_dev *pctldev, unsigned pin, 505 unsigned long *configs, unsigned num_configs) 506 { 507 struct nsp_gpio *chip = pinctrl_dev_get_drvdata(pctldev); 508 enum pin_config_param param; 509 u32 arg; 510 unsigned int i, gpio; 511 int ret = -ENOTSUPP; 512 513 gpio = nsp_pin_to_gpio(pin); 514 for (i = 0; i < num_configs; i++) { 515 param = pinconf_to_config_param(configs[i]); 516 arg = pinconf_to_config_argument(configs[i]); 517 518 switch (param) { 519 case PIN_CONFIG_BIAS_DISABLE: 520 ret = nsp_gpio_set_pull(chip, gpio, false, false); 521 if (ret < 0) 522 goto out; 523 break; 524 525 case PIN_CONFIG_BIAS_PULL_UP: 526 ret = nsp_gpio_set_pull(chip, gpio, true, false); 527 if (ret < 0) 528 goto out; 529 break; 530 531 case PIN_CONFIG_BIAS_PULL_DOWN: 532 ret = nsp_gpio_set_pull(chip, gpio, false, true); 533 if (ret < 0) 534 goto out; 535 break; 536 537 case PIN_CONFIG_DRIVE_STRENGTH: 538 ret = nsp_gpio_set_strength(chip, gpio, arg); 539 if (ret < 0) 540 goto out; 541 break; 542 543 case PIN_CONFIG_SLEW_RATE: 544 ret = nsp_gpio_set_slew(chip, gpio, arg); 545 if (ret < 0) 546 goto out; 547 break; 548 549 default: 550 dev_err(chip->dev, "invalid configuration\n"); 551 return -ENOTSUPP; 552 } 553 } 554 555 out: 556 return ret; 557 } 558 559 static const struct pinconf_ops nsp_pconf_ops = { 560 .is_generic = true, 561 .pin_config_get = nsp_pin_config_get, 562 .pin_config_set = nsp_pin_config_set, 563 .pin_config_group_get = nsp_pin_config_group_get, 564 .pin_config_group_set = nsp_pin_config_group_set, 565 }; 566 567 /* 568 * NSP GPIO controller supports some PINCONF related configurations such as 569 * pull up, pull down, slew and drive strength, when the pin is configured 570 * to GPIO. 571 * 572 * Here a local pinctrl device is created with simple 1-to-1 pin mapping to the 573 * local GPIO pins 574 */ 575 static int nsp_gpio_register_pinconf(struct nsp_gpio *chip) 576 { 577 struct pinctrl_desc *pctldesc = &chip->pctldesc; 578 struct pinctrl_pin_desc *pins; 579 struct gpio_chip *gc = &chip->gc; 580 int i; 581 582 pins = devm_kcalloc(chip->dev, gc->ngpio, sizeof(*pins), GFP_KERNEL); 583 if (!pins) 584 return -ENOMEM; 585 for (i = 0; i < gc->ngpio; i++) { 586 pins[i].number = i; 587 pins[i].name = devm_kasprintf(chip->dev, GFP_KERNEL, 588 "gpio-%d", i); 589 if (!pins[i].name) 590 return -ENOMEM; 591 } 592 pctldesc->name = dev_name(chip->dev); 593 pctldesc->pctlops = &nsp_pctrl_ops; 594 pctldesc->pins = pins; 595 pctldesc->npins = gc->ngpio; 596 pctldesc->confops = &nsp_pconf_ops; 597 598 chip->pctl = devm_pinctrl_register(chip->dev, pctldesc, chip); 599 if (IS_ERR(chip->pctl)) { 600 dev_err(chip->dev, "unable to register pinctrl device\n"); 601 return PTR_ERR(chip->pctl); 602 } 603 604 return 0; 605 } 606 607 static const struct of_device_id nsp_gpio_of_match[] = { 608 {.compatible = "brcm,nsp-gpio-a",}, 609 {} 610 }; 611 612 static int nsp_gpio_probe(struct platform_device *pdev) 613 { 614 struct device *dev = &pdev->dev; 615 struct nsp_gpio *chip; 616 struct gpio_chip *gc; 617 u32 val; 618 int irq, ret; 619 620 if (of_property_read_u32(pdev->dev.of_node, "ngpios", &val)) { 621 dev_err(&pdev->dev, "Missing ngpios OF property\n"); 622 return -ENODEV; 623 } 624 625 chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL); 626 if (!chip) 627 return -ENOMEM; 628 629 chip->dev = dev; 630 platform_set_drvdata(pdev, chip); 631 632 chip->base = devm_platform_ioremap_resource(pdev, 0); 633 if (IS_ERR(chip->base)) { 634 dev_err(dev, "unable to map I/O memory\n"); 635 return PTR_ERR(chip->base); 636 } 637 638 chip->io_ctrl = devm_platform_ioremap_resource(pdev, 1); 639 if (IS_ERR(chip->io_ctrl)) { 640 dev_err(dev, "unable to map I/O memory\n"); 641 return PTR_ERR(chip->io_ctrl); 642 } 643 644 raw_spin_lock_init(&chip->lock); 645 gc = &chip->gc; 646 gc->base = -1; 647 gc->can_sleep = false; 648 gc->ngpio = val; 649 gc->label = dev_name(dev); 650 gc->parent = dev; 651 gc->request = gpiochip_generic_request; 652 gc->free = gpiochip_generic_free; 653 gc->direction_input = nsp_gpio_direction_input; 654 gc->direction_output = nsp_gpio_direction_output; 655 gc->get_direction = nsp_gpio_get_direction; 656 gc->set = nsp_gpio_set; 657 gc->get = nsp_gpio_get; 658 659 /* optional GPIO interrupt support */ 660 irq = platform_get_irq(pdev, 0); 661 if (irq > 0) { 662 struct gpio_irq_chip *girq; 663 struct irq_chip *irqc; 664 665 irqc = &chip->irqchip; 666 irqc->name = "gpio-a"; 667 irqc->irq_ack = nsp_gpio_irq_ack; 668 irqc->irq_mask = nsp_gpio_irq_mask; 669 irqc->irq_unmask = nsp_gpio_irq_unmask; 670 irqc->irq_set_type = nsp_gpio_irq_set_type; 671 672 val = readl(chip->base + NSP_CHIP_A_INT_MASK); 673 val = val | NSP_CHIP_A_GPIO_INT_BIT; 674 writel(val, (chip->base + NSP_CHIP_A_INT_MASK)); 675 676 /* Install ISR for this GPIO controller. */ 677 ret = devm_request_irq(dev, irq, nsp_gpio_irq_handler, 678 IRQF_SHARED, "gpio-a", &chip->gc); 679 if (ret) { 680 dev_err(&pdev->dev, "Unable to request IRQ%d: %d\n", 681 irq, ret); 682 return ret; 683 } 684 685 girq = &chip->gc.irq; 686 girq->chip = irqc; 687 /* This will let us handle the parent IRQ in the driver */ 688 girq->parent_handler = NULL; 689 girq->num_parents = 0; 690 girq->parents = NULL; 691 girq->default_type = IRQ_TYPE_NONE; 692 girq->handler = handle_bad_irq; 693 } 694 695 ret = devm_gpiochip_add_data(dev, gc, chip); 696 if (ret < 0) { 697 dev_err(dev, "unable to add GPIO chip\n"); 698 return ret; 699 } 700 701 ret = nsp_gpio_register_pinconf(chip); 702 if (ret) { 703 dev_err(dev, "unable to register pinconf\n"); 704 return ret; 705 } 706 707 return 0; 708 } 709 710 static struct platform_driver nsp_gpio_driver = { 711 .driver = { 712 .name = "nsp-gpio-a", 713 .of_match_table = nsp_gpio_of_match, 714 }, 715 .probe = nsp_gpio_probe, 716 }; 717 718 static int __init nsp_gpio_init(void) 719 { 720 return platform_driver_register(&nsp_gpio_driver); 721 } 722 arch_initcall_sync(nsp_gpio_init); 723