1// SPDX-License-Identifier: GPL-2.0-only
2// Copyright (C) 2014-2017 Broadcom
3
4/*
5 * This file contains the Broadcom Northstar Plus (NSP) GPIO driver that
6 * supports the chipCommonA GPIO controller. Basic PINCONF such as bias,
7 * pull up/down, slew and drive strength are also supported in this driver.
8 *
9 * Pins from the chipCommonA GPIO can be individually muxed to GPIO function,
10 * through the interaction with the NSP IOMUX controller.
11 */
12
13#include <linux/gpio/driver.h>
14#include <linux/interrupt.h>
15#include <linux/io.h>
16#include <linux/ioport.h>
17#include <linux/kernel.h>
18#include <linux/of.h>
19#include <linux/pinctrl/pinconf.h>
20#include <linux/pinctrl/pinconf-generic.h>
21#include <linux/pinctrl/pinctrl.h>
22#include <linux/platform_device.h>
23#include <linux/slab.h>
24
25#include "../pinctrl-utils.h"
26
27#define NSP_CHIP_A_INT_STATUS 0x00
28#define NSP_CHIP_A_INT_MASK 0x04
29#define NSP_GPIO_DATA_IN 0x40
30#define NSP_GPIO_DATA_OUT 0x44
31#define NSP_GPIO_OUT_EN 0x48
32#define NSP_GPIO_INT_POLARITY 0x50
33#define NSP_GPIO_INT_MASK 0x54
34#define NSP_GPIO_EVENT 0x58
35#define NSP_GPIO_EVENT_INT_MASK 0x5c
36#define NSP_GPIO_EVENT_INT_POLARITY 0x64
37#define NSP_CHIP_A_GPIO_INT_BIT 0x01
38
39/* I/O parameters offset for chipcommon A GPIO */
40#define NSP_GPIO_DRV_CTRL 0x00
41#define NSP_GPIO_HYSTERESIS_EN 0x10
42#define NSP_GPIO_SLEW_RATE_EN 0x14
43#define NSP_PULL_UP_EN 0x18
44#define NSP_PULL_DOWN_EN 0x1c
45#define GPIO_DRV_STRENGTH_BITS 0x03
46
47/*
48 * nsp GPIO core
49 *
50 * @dev: pointer to device
51 * @base: I/O register base for nsp GPIO controller
52 * @io_ctrl: I/O register base for PINCONF support outside the GPIO block
53 * @gc: GPIO chip
54 * @pctl: pointer to pinctrl_dev
55 * @pctldesc: pinctrl descriptor
56 * @lock: lock to protect access to I/O registers
57 */
58struct nsp_gpio {
59 struct device *dev;
60 void __iomem *base;
61 void __iomem *io_ctrl;
62 struct gpio_chip gc;
63 struct pinctrl_dev *pctl;
64 struct pinctrl_desc pctldesc;
65 raw_spinlock_t lock;
66};
67
68enum base_type {
69 REG,
70 IO_CTRL
71};
72
73/*
74 * Mapping from PINCONF pins to GPIO pins is 1-to-1
75 */
76static inline unsigned nsp_pin_to_gpio(unsigned pin)
77{
78 return pin;
79}
80
81/*
82 * nsp_set_bit - set or clear one bit (corresponding to the GPIO pin) in a
83 * nsp GPIO register
84 *
85 * @nsp_gpio: nsp GPIO device
86 * @base_type: reg base to modify
87 * @reg: register offset
88 * @gpio: GPIO pin
89 * @set: set or clear
90 */
91static inline void nsp_set_bit(struct nsp_gpio *chip, enum base_type address,
92 unsigned int reg, unsigned gpio, bool set)
93{
94 u32 val;
95 void __iomem *base_address;
96
97 if (address == IO_CTRL)
98 base_address = chip->io_ctrl;
99 else
100 base_address = chip->base;
101
102 val = readl(addr: base_address + reg);
103 if (set)
104 val |= BIT(gpio);
105 else
106 val &= ~BIT(gpio);
107
108 writel(val, addr: base_address + reg);
109}
110
111/*
112 * nsp_get_bit - get one bit (corresponding to the GPIO pin) in a
113 * nsp GPIO register
114 */
115static inline bool nsp_get_bit(struct nsp_gpio *chip, enum base_type address,
116 unsigned int reg, unsigned gpio)
117{
118 if (address == IO_CTRL)
119 return !!(readl(addr: chip->io_ctrl + reg) & BIT(gpio));
120 else
121 return !!(readl(addr: chip->base + reg) & BIT(gpio));
122}
123
124static irqreturn_t nsp_gpio_irq_handler(int irq, void *data)
125{
126 struct gpio_chip *gc = (struct gpio_chip *)data;
127 struct nsp_gpio *chip = gpiochip_get_data(gc);
128 int bit;
129 unsigned long int_bits = 0;
130 u32 int_status;
131
132 /* go through the entire GPIOs and handle all interrupts */
133 int_status = readl(addr: chip->base + NSP_CHIP_A_INT_STATUS);
134 if (int_status & NSP_CHIP_A_GPIO_INT_BIT) {
135 unsigned int event, level;
136
137 /* Get level and edge interrupts */
138 event = readl(addr: chip->base + NSP_GPIO_EVENT_INT_MASK) &
139 readl(addr: chip->base + NSP_GPIO_EVENT);
140 level = readl(addr: chip->base + NSP_GPIO_DATA_IN) ^
141 readl(addr: chip->base + NSP_GPIO_INT_POLARITY);
142 level &= readl(addr: chip->base + NSP_GPIO_INT_MASK);
143 int_bits = level | event;
144
145 for_each_set_bit(bit, &int_bits, gc->ngpio)
146 generic_handle_domain_irq(domain: gc->irq.domain, hwirq: bit);
147 }
148
149 return int_bits ? IRQ_HANDLED : IRQ_NONE;
150}
151
152static void nsp_gpio_irq_ack(struct irq_data *d)
153{
154 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
155 struct nsp_gpio *chip = gpiochip_get_data(gc);
156 unsigned gpio = d->hwirq;
157 u32 val = BIT(gpio);
158 u32 trigger_type;
159
160 trigger_type = irq_get_trigger_type(irq: d->irq);
161 if (trigger_type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
162 writel(val, addr: chip->base + NSP_GPIO_EVENT);
163}
164
165/*
166 * nsp_gpio_irq_set_mask - mask/unmask a GPIO interrupt
167 *
168 * @d: IRQ chip data
169 * @unmask: mask/unmask GPIO interrupt
170 */
171static void nsp_gpio_irq_set_mask(struct irq_data *d, bool unmask)
172{
173 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
174 struct nsp_gpio *chip = gpiochip_get_data(gc);
175 unsigned gpio = d->hwirq;
176 u32 trigger_type;
177
178 trigger_type = irq_get_trigger_type(irq: d->irq);
179 if (trigger_type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
180 nsp_set_bit(chip, address: REG, NSP_GPIO_EVENT_INT_MASK, gpio, set: unmask);
181 else
182 nsp_set_bit(chip, address: REG, NSP_GPIO_INT_MASK, gpio, set: unmask);
183}
184
185static void nsp_gpio_irq_mask(struct irq_data *d)
186{
187 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
188 struct nsp_gpio *chip = gpiochip_get_data(gc);
189 unsigned long flags;
190
191 raw_spin_lock_irqsave(&chip->lock, flags);
192 nsp_gpio_irq_set_mask(d, unmask: false);
193 raw_spin_unlock_irqrestore(&chip->lock, flags);
194 gpiochip_disable_irq(gc, offset: irqd_to_hwirq(d));
195}
196
197static void nsp_gpio_irq_unmask(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 gpiochip_enable_irq(gc, offset: irqd_to_hwirq(d));
204 raw_spin_lock_irqsave(&chip->lock, flags);
205 nsp_gpio_irq_set_mask(d, unmask: true);
206 raw_spin_unlock_irqrestore(&chip->lock, flags);
207}
208
209static int nsp_gpio_irq_set_type(struct irq_data *d, unsigned int type)
210{
211 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
212 struct nsp_gpio *chip = gpiochip_get_data(gc);
213 unsigned gpio = d->hwirq;
214 bool level_low;
215 bool falling;
216 unsigned long flags;
217
218 raw_spin_lock_irqsave(&chip->lock, flags);
219 falling = nsp_get_bit(chip, address: REG, NSP_GPIO_EVENT_INT_POLARITY, gpio);
220 level_low = nsp_get_bit(chip, address: REG, NSP_GPIO_INT_POLARITY, gpio);
221
222 switch (type & IRQ_TYPE_SENSE_MASK) {
223 case IRQ_TYPE_EDGE_RISING:
224 falling = false;
225 break;
226
227 case IRQ_TYPE_EDGE_FALLING:
228 falling = true;
229 break;
230
231 case IRQ_TYPE_LEVEL_HIGH:
232 level_low = false;
233 break;
234
235 case IRQ_TYPE_LEVEL_LOW:
236 level_low = true;
237 break;
238
239 default:
240 dev_err(chip->dev, "invalid GPIO IRQ type 0x%x\n",
241 type);
242 raw_spin_unlock_irqrestore(&chip->lock, flags);
243 return -EINVAL;
244 }
245
246 nsp_set_bit(chip, address: REG, NSP_GPIO_EVENT_INT_POLARITY, gpio, set: falling);
247 nsp_set_bit(chip, address: REG, NSP_GPIO_INT_POLARITY, gpio, set: level_low);
248
249 if (type & IRQ_TYPE_EDGE_BOTH)
250 irq_set_handler_locked(data: d, handler: handle_edge_irq);
251 else
252 irq_set_handler_locked(data: d, handler: handle_level_irq);
253
254 raw_spin_unlock_irqrestore(&chip->lock, flags);
255
256 dev_dbg(chip->dev, "gpio:%u level_low:%s falling:%s\n", gpio,
257 level_low ? "true" : "false", falling ? "true" : "false");
258 return 0;
259}
260
261static const struct irq_chip nsp_gpio_irq_chip = {
262 .name = "gpio-a",
263 .irq_ack = nsp_gpio_irq_ack,
264 .irq_mask = nsp_gpio_irq_mask,
265 .irq_unmask = nsp_gpio_irq_unmask,
266 .irq_set_type = nsp_gpio_irq_set_type,
267 .flags = IRQCHIP_IMMUTABLE,
268 GPIOCHIP_IRQ_RESOURCE_HELPERS,
269};
270
271static 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, address: REG, NSP_GPIO_OUT_EN, gpio, set: 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
284static 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, address: REG, NSP_GPIO_OUT_EN, gpio, set: true);
292 nsp_set_bit(chip, address: REG, NSP_GPIO_DATA_OUT, gpio, set: !!(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
299static 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, address: REG, NSP_GPIO_OUT_EN, gpio);
307 raw_spin_unlock_irqrestore(&chip->lock, flags);
308
309 return !val;
310}
311
312static 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, address: REG, NSP_GPIO_DATA_OUT, gpio, set: !!(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
324static int nsp_gpio_get(struct gpio_chip *gc, unsigned gpio)
325{
326 struct nsp_gpio *chip = gpiochip_get_data(gc);
327
328 return !!(readl(addr: chip->base + NSP_GPIO_DATA_IN) & BIT(gpio));
329}
330
331static 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 */
340static const char *nsp_get_group_name(struct pinctrl_dev *pctldev,
341 unsigned selector)
342{
343 return "gpio_grp";
344}
345
346static 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
353static int nsp_gpio_set_slew(struct nsp_gpio *chip, unsigned gpio, u32 slew)
354{
355 if (slew)
356 nsp_set_bit(chip, address: IO_CTRL, NSP_GPIO_SLEW_RATE_EN, gpio, set: true);
357 else
358 nsp_set_bit(chip, address: IO_CTRL, NSP_GPIO_SLEW_RATE_EN, gpio, set: false);
359
360 return 0;
361}
362
363static 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, address: IO_CTRL, NSP_PULL_DOWN_EN, gpio, set: pull_down);
370 nsp_set_bit(chip, address: IO_CTRL, NSP_PULL_UP_EN, gpio, set: 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
378static 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, address: IO_CTRL, NSP_PULL_UP_EN, gpio);
385 *pull_down = nsp_get_bit(chip, address: IO_CTRL, NSP_PULL_DOWN_EN, gpio);
386 raw_spin_unlock_irqrestore(&chip->lock, flags);
387}
388
389static 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(addr: chip->io_ctrl + offset);
408 val &= ~BIT(shift);
409 val |= ((strength >> (i-1)) & 0x1) << shift;
410 writel(val, addr: chip->io_ctrl + offset);
411 offset += 4;
412 }
413 raw_spin_unlock_irqrestore(&chip->lock, flags);
414
415 return 0;
416}
417
418static 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(addr: 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
445static int nsp_pin_config_group_get(struct pinctrl_dev *pctldev,
446 unsigned selector,
447 unsigned long *config)
448{
449 return 0;
450}
451
452static 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
459static 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: *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_up, pull_down: &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_up, pull_down: &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_up, pull_down: &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, strength: &arg);
494 if (ret)
495 return ret;
496 *config = pinconf_to_config_packed(param, argument: arg);
497 return 0;
498
499 default:
500 return -ENOTSUPP;
501 }
502}
503
504static 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(config: configs[i]);
516 arg = pinconf_to_config_argument(config: configs[i]);
517
518 switch (param) {
519 case PIN_CONFIG_BIAS_DISABLE:
520 ret = nsp_gpio_set_pull(chip, gpio, pull_up: false, pull_down: 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, pull_up: true, pull_down: 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, pull_up: false, pull_down: 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, strength: 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, slew: 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
555out:
556 return ret;
557}
558
559static 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 */
575static 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(dev: chip->dev, n: gc->ngpio, size: 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(dev: chip->dev, GFP_KERNEL,
588 fmt: "gpio-%d", i);
589 if (!pins[i].name)
590 return -ENOMEM;
591 }
592 pctldesc->name = dev_name(dev: 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(dev: chip->dev, pctldesc, driver_data: chip);
599 if (IS_ERR(ptr: chip->pctl)) {
600 dev_err(chip->dev, "unable to register pinctrl device\n");
601 return PTR_ERR(ptr: chip->pctl);
602 }
603
604 return 0;
605}
606
607static const struct of_device_id nsp_gpio_of_match[] = {
608 {.compatible = "brcm,nsp-gpio-a",},
609 {}
610};
611
612static 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(np: pdev->dev.of_node, propname: "ngpios", out_value: &val)) {
621 dev_err(&pdev->dev, "Missing ngpios OF property\n");
622 return -ENODEV;
623 }
624
625 chip = devm_kzalloc(dev, size: sizeof(*chip), GFP_KERNEL);
626 if (!chip)
627 return -ENOMEM;
628
629 chip->dev = dev;
630 platform_set_drvdata(pdev, data: chip);
631
632 chip->base = devm_platform_ioremap_resource(pdev, index: 0);
633 if (IS_ERR(ptr: chip->base)) {
634 dev_err(dev, "unable to map I/O memory\n");
635 return PTR_ERR(ptr: chip->base);
636 }
637
638 chip->io_ctrl = devm_platform_ioremap_resource(pdev, index: 1);
639 if (IS_ERR(ptr: chip->io_ctrl)) {
640 dev_err(dev, "unable to map I/O memory\n");
641 return PTR_ERR(ptr: 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
664 val = readl(addr: chip->base + NSP_CHIP_A_INT_MASK);
665 val = val | NSP_CHIP_A_GPIO_INT_BIT;
666 writel(val, addr: (chip->base + NSP_CHIP_A_INT_MASK));
667
668 /* Install ISR for this GPIO controller. */
669 ret = devm_request_irq(dev, irq, handler: nsp_gpio_irq_handler,
670 IRQF_SHARED, devname: "gpio-a", dev_id: &chip->gc);
671 if (ret) {
672 dev_err(&pdev->dev, "Unable to request IRQ%d: %d\n",
673 irq, ret);
674 return ret;
675 }
676
677 girq = &chip->gc.irq;
678 gpio_irq_chip_set_chip(girq, chip: &nsp_gpio_irq_chip);
679 /* This will let us handle the parent IRQ in the driver */
680 girq->parent_handler = NULL;
681 girq->num_parents = 0;
682 girq->parents = NULL;
683 girq->default_type = IRQ_TYPE_NONE;
684 girq->handler = handle_bad_irq;
685 }
686
687 ret = devm_gpiochip_add_data(dev, gc, chip);
688 if (ret < 0)
689 return dev_err_probe(dev, err: ret, fmt: "unable to add GPIO chip\n");
690
691 ret = nsp_gpio_register_pinconf(chip);
692 if (ret) {
693 dev_err(dev, "unable to register pinconf\n");
694 return ret;
695 }
696
697 return 0;
698}
699
700static struct platform_driver nsp_gpio_driver = {
701 .driver = {
702 .name = "nsp-gpio-a",
703 .of_match_table = nsp_gpio_of_match,
704 },
705 .probe = nsp_gpio_probe,
706};
707
708static int __init nsp_gpio_init(void)
709{
710 return platform_driver_register(&nsp_gpio_driver);
711}
712arch_initcall_sync(nsp_gpio_init);
713

source code of linux/drivers/pinctrl/bcm/pinctrl-nsp-gpio.c