2 * Xilinx Zynq GPIO device driver
4 * Copyright (C) 2009 - 2014 Xilinx, Inc.
6 * This program is free software; you can redistribute it and/or modify it under
7 * the terms of the GNU General Public License as published by the Free Software
8 * Foundation; either version 2 of the License, or (at your option) any later
12 #include <linux/bitops.h>
13 #include <linux/clk.h>
14 #include <linux/gpio/driver.h>
15 #include <linux/init.h>
16 #include <linux/interrupt.h>
18 #include <linux/module.h>
19 #include <linux/platform_device.h>
20 #include <linux/pm_runtime.h>
23 #define DRIVER_NAME "zynq-gpio"
26 #define ZYNQ_GPIO_MAX_BANK 4
27 #define ZYNQMP_GPIO_MAX_BANK 6
29 #define ZYNQ_GPIO_BANK0_NGPIO 32
30 #define ZYNQ_GPIO_BANK1_NGPIO 22
31 #define ZYNQ_GPIO_BANK2_NGPIO 32
32 #define ZYNQ_GPIO_BANK3_NGPIO 32
34 #define ZYNQMP_GPIO_BANK0_NGPIO 26
35 #define ZYNQMP_GPIO_BANK1_NGPIO 26
36 #define ZYNQMP_GPIO_BANK2_NGPIO 26
37 #define ZYNQMP_GPIO_BANK3_NGPIO 32
38 #define ZYNQMP_GPIO_BANK4_NGPIO 32
39 #define ZYNQMP_GPIO_BANK5_NGPIO 32
41 #define ZYNQ_GPIO_NR_GPIOS 118
42 #define ZYNQMP_GPIO_NR_GPIOS 174
44 #define ZYNQ_GPIO_BANK0_PIN_MIN(str) 0
45 #define ZYNQ_GPIO_BANK0_PIN_MAX(str) (ZYNQ_GPIO_BANK0_PIN_MIN(str) + \
46 ZYNQ##str##_GPIO_BANK0_NGPIO - 1)
47 #define ZYNQ_GPIO_BANK1_PIN_MIN(str) (ZYNQ_GPIO_BANK0_PIN_MAX(str) + 1)
48 #define ZYNQ_GPIO_BANK1_PIN_MAX(str) (ZYNQ_GPIO_BANK1_PIN_MIN(str) + \
49 ZYNQ##str##_GPIO_BANK1_NGPIO - 1)
50 #define ZYNQ_GPIO_BANK2_PIN_MIN(str) (ZYNQ_GPIO_BANK1_PIN_MAX(str) + 1)
51 #define ZYNQ_GPIO_BANK2_PIN_MAX(str) (ZYNQ_GPIO_BANK2_PIN_MIN(str) + \
52 ZYNQ##str##_GPIO_BANK2_NGPIO - 1)
53 #define ZYNQ_GPIO_BANK3_PIN_MIN(str) (ZYNQ_GPIO_BANK2_PIN_MAX(str) + 1)
54 #define ZYNQ_GPIO_BANK3_PIN_MAX(str) (ZYNQ_GPIO_BANK3_PIN_MIN(str) + \
55 ZYNQ##str##_GPIO_BANK3_NGPIO - 1)
56 #define ZYNQ_GPIO_BANK4_PIN_MIN(str) (ZYNQ_GPIO_BANK3_PIN_MAX(str) + 1)
57 #define ZYNQ_GPIO_BANK4_PIN_MAX(str) (ZYNQ_GPIO_BANK4_PIN_MIN(str) + \
58 ZYNQ##str##_GPIO_BANK4_NGPIO - 1)
59 #define ZYNQ_GPIO_BANK5_PIN_MIN(str) (ZYNQ_GPIO_BANK4_PIN_MAX(str) + 1)
60 #define ZYNQ_GPIO_BANK5_PIN_MAX(str) (ZYNQ_GPIO_BANK5_PIN_MIN(str) + \
61 ZYNQ##str##_GPIO_BANK5_NGPIO - 1)
64 /* Register offsets for the GPIO device */
65 /* LSW Mask & Data -WO */
66 #define ZYNQ_GPIO_DATA_LSW_OFFSET(BANK) (0x000 + (8 * BANK))
67 /* MSW Mask & Data -WO */
68 #define ZYNQ_GPIO_DATA_MSW_OFFSET(BANK) (0x004 + (8 * BANK))
69 /* Data Register-RW */
70 #define ZYNQ_GPIO_DATA_RO_OFFSET(BANK) (0x060 + (4 * BANK))
71 /* Direction mode reg-RW */
72 #define ZYNQ_GPIO_DIRM_OFFSET(BANK) (0x204 + (0x40 * BANK))
73 /* Output enable reg-RW */
74 #define ZYNQ_GPIO_OUTEN_OFFSET(BANK) (0x208 + (0x40 * BANK))
75 /* Interrupt mask reg-RO */
76 #define ZYNQ_GPIO_INTMASK_OFFSET(BANK) (0x20C + (0x40 * BANK))
77 /* Interrupt enable reg-WO */
78 #define ZYNQ_GPIO_INTEN_OFFSET(BANK) (0x210 + (0x40 * BANK))
79 /* Interrupt disable reg-WO */
80 #define ZYNQ_GPIO_INTDIS_OFFSET(BANK) (0x214 + (0x40 * BANK))
81 /* Interrupt status reg-RO */
82 #define ZYNQ_GPIO_INTSTS_OFFSET(BANK) (0x218 + (0x40 * BANK))
83 /* Interrupt type reg-RW */
84 #define ZYNQ_GPIO_INTTYPE_OFFSET(BANK) (0x21C + (0x40 * BANK))
85 /* Interrupt polarity reg-RW */
86 #define ZYNQ_GPIO_INTPOL_OFFSET(BANK) (0x220 + (0x40 * BANK))
87 /* Interrupt on any, reg-RW */
88 #define ZYNQ_GPIO_INTANY_OFFSET(BANK) (0x224 + (0x40 * BANK))
90 /* Disable all interrupts mask */
91 #define ZYNQ_GPIO_IXR_DISABLE_ALL 0xFFFFFFFF
93 /* Mid pin number of a bank */
94 #define ZYNQ_GPIO_MID_PIN_NUM 16
96 /* GPIO upper 16 bit mask */
97 #define ZYNQ_GPIO_UPPER_MASK 0xFFFF0000
100 * struct zynq_gpio - gpio device private data structure
101 * @chip: instance of the gpio_chip
102 * @base_addr: base address of the GPIO device
103 * @clk: clock resource for this controller
104 * @irq: interrupt for the GPIO device
105 * @p_data: pointer to platform data
108 struct gpio_chip chip;
109 void __iomem *base_addr;
112 const struct zynq_platform_data *p_data;
116 * struct zynq_platform_data - zynq gpio platform data structure
117 * @label: string to store in gpio->label
118 * @ngpio: max number of gpio pins
119 * @max_bank: maximum number of gpio banks
120 * @bank_min: this array represents bank's min pin
121 * @bank_max: this array represents bank's max pin
123 struct zynq_platform_data {
127 int bank_min[ZYNQMP_GPIO_MAX_BANK];
128 int bank_max[ZYNQMP_GPIO_MAX_BANK];
131 static struct irq_chip zynq_gpio_level_irqchip;
132 static struct irq_chip zynq_gpio_edge_irqchip;
134 static struct zynq_gpio *to_zynq_gpio(struct gpio_chip *gc)
136 return container_of(gc, struct zynq_gpio, chip);
140 * zynq_gpio_get_bank_pin - Get the bank number and pin number within that bank
141 * for a given pin in the GPIO device
142 * @pin_num: gpio pin number within the device
143 * @bank_num: an output parameter used to return the bank number of the gpio
145 * @bank_pin_num: an output parameter used to return pin number within a bank
146 * for the given gpio pin
148 * Returns the bank number and pin offset within the bank.
150 static inline void zynq_gpio_get_bank_pin(unsigned int pin_num,
151 unsigned int *bank_num,
152 unsigned int *bank_pin_num,
153 struct zynq_gpio *gpio)
157 for (bank = 0; bank < gpio->p_data->max_bank; bank++) {
158 if ((pin_num >= gpio->p_data->bank_min[bank]) &&
159 (pin_num <= gpio->p_data->bank_max[bank])) {
161 *bank_pin_num = pin_num -
162 gpio->p_data->bank_min[bank];
168 WARN(true, "invalid GPIO pin number: %u", pin_num);
174 * zynq_gpio_get_value - Get the state of the specified pin of GPIO device
175 * @chip: gpio_chip instance to be worked on
176 * @pin: gpio pin number within the device
178 * This function reads the state of the specified pin of the GPIO device.
180 * Return: 0 if the pin is low, 1 if pin is high.
182 static int zynq_gpio_get_value(struct gpio_chip *chip, unsigned int pin)
185 unsigned int bank_num, bank_pin_num;
186 struct zynq_gpio *gpio = to_zynq_gpio(chip);
188 zynq_gpio_get_bank_pin(pin, &bank_num, &bank_pin_num, gpio);
190 data = readl_relaxed(gpio->base_addr +
191 ZYNQ_GPIO_DATA_RO_OFFSET(bank_num));
193 return (data >> bank_pin_num) & 1;
197 * zynq_gpio_set_value - Modify the state of the pin with specified value
198 * @chip: gpio_chip instance to be worked on
199 * @pin: gpio pin number within the device
200 * @state: value used to modify the state of the specified pin
202 * This function calculates the register offset (i.e to lower 16 bits or
203 * upper 16 bits) based on the given pin number and sets the state of a
204 * gpio pin to the specified value. The state is either 0 or non-zero.
206 static void zynq_gpio_set_value(struct gpio_chip *chip, unsigned int pin,
209 unsigned int reg_offset, bank_num, bank_pin_num;
210 struct zynq_gpio *gpio = to_zynq_gpio(chip);
212 zynq_gpio_get_bank_pin(pin, &bank_num, &bank_pin_num, gpio);
214 if (bank_pin_num >= ZYNQ_GPIO_MID_PIN_NUM) {
215 /* only 16 data bits in bit maskable reg */
216 bank_pin_num -= ZYNQ_GPIO_MID_PIN_NUM;
217 reg_offset = ZYNQ_GPIO_DATA_MSW_OFFSET(bank_num);
219 reg_offset = ZYNQ_GPIO_DATA_LSW_OFFSET(bank_num);
223 * get the 32 bit value to be written to the mask/data register where
224 * the upper 16 bits is the mask and lower 16 bits is the data
227 state = ~(1 << (bank_pin_num + ZYNQ_GPIO_MID_PIN_NUM)) &
228 ((state << bank_pin_num) | ZYNQ_GPIO_UPPER_MASK);
230 writel_relaxed(state, gpio->base_addr + reg_offset);
234 * zynq_gpio_dir_in - Set the direction of the specified GPIO pin as input
235 * @chip: gpio_chip instance to be worked on
236 * @pin: gpio pin number within the device
238 * This function uses the read-modify-write sequence to set the direction of
239 * the gpio pin as input.
243 static int zynq_gpio_dir_in(struct gpio_chip *chip, unsigned int pin)
246 unsigned int bank_num, bank_pin_num;
247 struct zynq_gpio *gpio = to_zynq_gpio(chip);
249 zynq_gpio_get_bank_pin(pin, &bank_num, &bank_pin_num, gpio);
251 /* bank 0 pins 7 and 8 are special and cannot be used as inputs */
252 if (bank_num == 0 && (bank_pin_num == 7 || bank_pin_num == 8))
255 /* clear the bit in direction mode reg to set the pin as input */
256 reg = readl_relaxed(gpio->base_addr + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
257 reg &= ~BIT(bank_pin_num);
258 writel_relaxed(reg, gpio->base_addr + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
264 * zynq_gpio_dir_out - Set the direction of the specified GPIO pin as output
265 * @chip: gpio_chip instance to be worked on
266 * @pin: gpio pin number within the device
267 * @state: value to be written to specified pin
269 * This function sets the direction of specified GPIO pin as output, configures
270 * the Output Enable register for the pin and uses zynq_gpio_set to set
271 * the state of the pin to the value specified.
275 static int zynq_gpio_dir_out(struct gpio_chip *chip, unsigned int pin,
279 unsigned int bank_num, bank_pin_num;
280 struct zynq_gpio *gpio = to_zynq_gpio(chip);
282 zynq_gpio_get_bank_pin(pin, &bank_num, &bank_pin_num, gpio);
284 /* set the GPIO pin as output */
285 reg = readl_relaxed(gpio->base_addr + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
286 reg |= BIT(bank_pin_num);
287 writel_relaxed(reg, gpio->base_addr + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
289 /* configure the output enable reg for the pin */
290 reg = readl_relaxed(gpio->base_addr + ZYNQ_GPIO_OUTEN_OFFSET(bank_num));
291 reg |= BIT(bank_pin_num);
292 writel_relaxed(reg, gpio->base_addr + ZYNQ_GPIO_OUTEN_OFFSET(bank_num));
294 /* set the state of the pin */
295 zynq_gpio_set_value(chip, pin, state);
300 * zynq_gpio_irq_mask - Disable the interrupts for a gpio pin
301 * @irq_data: per irq and chip data passed down to chip functions
303 * This function calculates gpio pin number from irq number and sets the
304 * bit in the Interrupt Disable register of the corresponding bank to disable
305 * interrupts for that pin.
307 static void zynq_gpio_irq_mask(struct irq_data *irq_data)
309 unsigned int device_pin_num, bank_num, bank_pin_num;
310 struct zynq_gpio *gpio =
311 to_zynq_gpio(irq_data_get_irq_chip_data(irq_data));
313 device_pin_num = irq_data->hwirq;
314 zynq_gpio_get_bank_pin(device_pin_num, &bank_num, &bank_pin_num, gpio);
315 writel_relaxed(BIT(bank_pin_num),
316 gpio->base_addr + ZYNQ_GPIO_INTDIS_OFFSET(bank_num));
320 * zynq_gpio_irq_unmask - Enable the interrupts for a gpio pin
321 * @irq_data: irq data containing irq number of gpio pin for the interrupt
324 * This function calculates the gpio pin number from irq number and sets the
325 * bit in the Interrupt Enable register of the corresponding bank to enable
326 * interrupts for that pin.
328 static void zynq_gpio_irq_unmask(struct irq_data *irq_data)
330 unsigned int device_pin_num, bank_num, bank_pin_num;
331 struct zynq_gpio *gpio =
332 to_zynq_gpio(irq_data_get_irq_chip_data(irq_data));
334 device_pin_num = irq_data->hwirq;
335 zynq_gpio_get_bank_pin(device_pin_num, &bank_num, &bank_pin_num, gpio);
336 writel_relaxed(BIT(bank_pin_num),
337 gpio->base_addr + ZYNQ_GPIO_INTEN_OFFSET(bank_num));
341 * zynq_gpio_irq_ack - Acknowledge the interrupt of a gpio pin
342 * @irq_data: irq data containing irq number of gpio pin for the interrupt
345 * This function calculates gpio pin number from irq number and sets the bit
346 * in the Interrupt Status Register of the corresponding bank, to ACK the irq.
348 static void zynq_gpio_irq_ack(struct irq_data *irq_data)
350 unsigned int device_pin_num, bank_num, bank_pin_num;
351 struct zynq_gpio *gpio =
352 to_zynq_gpio(irq_data_get_irq_chip_data(irq_data));
354 device_pin_num = irq_data->hwirq;
355 zynq_gpio_get_bank_pin(device_pin_num, &bank_num, &bank_pin_num, gpio);
356 writel_relaxed(BIT(bank_pin_num),
357 gpio->base_addr + ZYNQ_GPIO_INTSTS_OFFSET(bank_num));
361 * zynq_gpio_irq_enable - Enable the interrupts for a gpio pin
362 * @irq_data: irq data containing irq number of gpio pin for the interrupt
365 * Clears the INTSTS bit and unmasks the given interrupt.
367 static void zynq_gpio_irq_enable(struct irq_data *irq_data)
370 * The Zynq GPIO controller does not disable interrupt detection when
371 * the interrupt is masked and only disables the propagation of the
372 * interrupt. This means when the controller detects an interrupt
373 * condition while the interrupt is logically disabled it will propagate
374 * that interrupt event once the interrupt is enabled. This will cause
375 * the interrupt consumer to see spurious interrupts to prevent this
376 * first make sure that the interrupt is not asserted and then enable
379 zynq_gpio_irq_ack(irq_data);
380 zynq_gpio_irq_unmask(irq_data);
384 * zynq_gpio_set_irq_type - Set the irq type for a gpio pin
385 * @irq_data: irq data containing irq number of gpio pin
386 * @type: interrupt type that is to be set for the gpio pin
388 * This function gets the gpio pin number and its bank from the gpio pin number
389 * and configures the INT_TYPE, INT_POLARITY and INT_ANY registers.
391 * Return: 0, negative error otherwise.
392 * TYPE-EDGE_RISING, INT_TYPE - 1, INT_POLARITY - 1, INT_ANY - 0;
393 * TYPE-EDGE_FALLING, INT_TYPE - 1, INT_POLARITY - 0, INT_ANY - 0;
394 * TYPE-EDGE_BOTH, INT_TYPE - 1, INT_POLARITY - NA, INT_ANY - 1;
395 * TYPE-LEVEL_HIGH, INT_TYPE - 0, INT_POLARITY - 1, INT_ANY - NA;
396 * TYPE-LEVEL_LOW, INT_TYPE - 0, INT_POLARITY - 0, INT_ANY - NA
398 static int zynq_gpio_set_irq_type(struct irq_data *irq_data, unsigned int type)
400 u32 int_type, int_pol, int_any;
401 unsigned int device_pin_num, bank_num, bank_pin_num;
402 struct zynq_gpio *gpio =
403 to_zynq_gpio(irq_data_get_irq_chip_data(irq_data));
405 device_pin_num = irq_data->hwirq;
406 zynq_gpio_get_bank_pin(device_pin_num, &bank_num, &bank_pin_num, gpio);
408 int_type = readl_relaxed(gpio->base_addr +
409 ZYNQ_GPIO_INTTYPE_OFFSET(bank_num));
410 int_pol = readl_relaxed(gpio->base_addr +
411 ZYNQ_GPIO_INTPOL_OFFSET(bank_num));
412 int_any = readl_relaxed(gpio->base_addr +
413 ZYNQ_GPIO_INTANY_OFFSET(bank_num));
416 * based on the type requested, configure the INT_TYPE, INT_POLARITY
417 * and INT_ANY registers
420 case IRQ_TYPE_EDGE_RISING:
421 int_type |= BIT(bank_pin_num);
422 int_pol |= BIT(bank_pin_num);
423 int_any &= ~BIT(bank_pin_num);
425 case IRQ_TYPE_EDGE_FALLING:
426 int_type |= BIT(bank_pin_num);
427 int_pol &= ~BIT(bank_pin_num);
428 int_any &= ~BIT(bank_pin_num);
430 case IRQ_TYPE_EDGE_BOTH:
431 int_type |= BIT(bank_pin_num);
432 int_any |= BIT(bank_pin_num);
434 case IRQ_TYPE_LEVEL_HIGH:
435 int_type &= ~BIT(bank_pin_num);
436 int_pol |= BIT(bank_pin_num);
438 case IRQ_TYPE_LEVEL_LOW:
439 int_type &= ~BIT(bank_pin_num);
440 int_pol &= ~BIT(bank_pin_num);
446 writel_relaxed(int_type,
447 gpio->base_addr + ZYNQ_GPIO_INTTYPE_OFFSET(bank_num));
448 writel_relaxed(int_pol,
449 gpio->base_addr + ZYNQ_GPIO_INTPOL_OFFSET(bank_num));
450 writel_relaxed(int_any,
451 gpio->base_addr + ZYNQ_GPIO_INTANY_OFFSET(bank_num));
453 if (type & IRQ_TYPE_LEVEL_MASK) {
454 irq_set_chip_handler_name_locked(irq_data,
455 &zynq_gpio_level_irqchip, handle_fasteoi_irq, NULL);
457 irq_set_chip_handler_name_locked(irq_data,
458 &zynq_gpio_edge_irqchip, handle_level_irq, NULL);
464 static int zynq_gpio_set_wake(struct irq_data *data, unsigned int on)
466 struct zynq_gpio *gpio =
467 to_zynq_gpio(irq_data_get_irq_chip_data(data));
469 irq_set_irq_wake(gpio->irq, on);
474 /* irq chip descriptor */
475 static struct irq_chip zynq_gpio_level_irqchip = {
477 .irq_enable = zynq_gpio_irq_enable,
478 .irq_eoi = zynq_gpio_irq_ack,
479 .irq_mask = zynq_gpio_irq_mask,
480 .irq_unmask = zynq_gpio_irq_unmask,
481 .irq_set_type = zynq_gpio_set_irq_type,
482 .irq_set_wake = zynq_gpio_set_wake,
483 .flags = IRQCHIP_EOI_THREADED | IRQCHIP_EOI_IF_HANDLED |
484 IRQCHIP_MASK_ON_SUSPEND,
487 static struct irq_chip zynq_gpio_edge_irqchip = {
489 .irq_enable = zynq_gpio_irq_enable,
490 .irq_ack = zynq_gpio_irq_ack,
491 .irq_mask = zynq_gpio_irq_mask,
492 .irq_unmask = zynq_gpio_irq_unmask,
493 .irq_set_type = zynq_gpio_set_irq_type,
494 .irq_set_wake = zynq_gpio_set_wake,
495 .flags = IRQCHIP_MASK_ON_SUSPEND,
498 static void zynq_gpio_handle_bank_irq(struct zynq_gpio *gpio,
499 unsigned int bank_num,
500 unsigned long pending)
502 unsigned int bank_offset = gpio->p_data->bank_min[bank_num];
503 struct irq_domain *irqdomain = gpio->chip.irqdomain;
509 for_each_set_bit(offset, &pending, 32) {
510 unsigned int gpio_irq;
512 gpio_irq = irq_find_mapping(irqdomain, offset + bank_offset);
513 generic_handle_irq(gpio_irq);
518 * zynq_gpio_irqhandler - IRQ handler for the gpio banks of a gpio device
519 * @irq: irq number of the gpio bank where interrupt has occurred
520 * @desc: irq descriptor instance of the 'irq'
522 * This function reads the Interrupt Status Register of each bank to get the
523 * gpio pin number which has triggered an interrupt. It then acks the triggered
524 * interrupt and calls the pin specific handler set by the higher layer
525 * application for that pin.
526 * Note: A bug is reported if no handler is set for the gpio pin.
528 static void zynq_gpio_irqhandler(struct irq_desc *desc)
530 u32 int_sts, int_enb;
531 unsigned int bank_num;
532 struct zynq_gpio *gpio =
533 to_zynq_gpio(irq_desc_get_handler_data(desc));
534 struct irq_chip *irqchip = irq_desc_get_chip(desc);
536 chained_irq_enter(irqchip, desc);
538 for (bank_num = 0; bank_num < gpio->p_data->max_bank; bank_num++) {
539 int_sts = readl_relaxed(gpio->base_addr +
540 ZYNQ_GPIO_INTSTS_OFFSET(bank_num));
541 int_enb = readl_relaxed(gpio->base_addr +
542 ZYNQ_GPIO_INTMASK_OFFSET(bank_num));
543 zynq_gpio_handle_bank_irq(gpio, bank_num, int_sts & ~int_enb);
546 chained_irq_exit(irqchip, desc);
549 static int __maybe_unused zynq_gpio_suspend(struct device *dev)
551 struct platform_device *pdev = to_platform_device(dev);
552 int irq = platform_get_irq(pdev, 0);
553 struct irq_data *data = irq_get_irq_data(irq);
555 if (!irqd_is_wakeup_set(data))
556 return pm_runtime_force_suspend(dev);
561 static int __maybe_unused zynq_gpio_resume(struct device *dev)
563 struct platform_device *pdev = to_platform_device(dev);
564 int irq = platform_get_irq(pdev, 0);
565 struct irq_data *data = irq_get_irq_data(irq);
567 if (!irqd_is_wakeup_set(data))
568 return pm_runtime_force_resume(dev);
573 static int __maybe_unused zynq_gpio_runtime_suspend(struct device *dev)
575 struct platform_device *pdev = to_platform_device(dev);
576 struct zynq_gpio *gpio = platform_get_drvdata(pdev);
578 clk_disable_unprepare(gpio->clk);
583 static int __maybe_unused zynq_gpio_runtime_resume(struct device *dev)
585 struct platform_device *pdev = to_platform_device(dev);
586 struct zynq_gpio *gpio = platform_get_drvdata(pdev);
588 return clk_prepare_enable(gpio->clk);
591 static int zynq_gpio_request(struct gpio_chip *chip, unsigned offset)
595 ret = pm_runtime_get_sync(chip->dev);
598 * If the device is already active pm_runtime_get() will return 1 on
599 * success, but gpio_request still needs to return 0.
601 return ret < 0 ? ret : 0;
604 static void zynq_gpio_free(struct gpio_chip *chip, unsigned offset)
606 pm_runtime_put(chip->dev);
609 static const struct dev_pm_ops zynq_gpio_dev_pm_ops = {
610 SET_SYSTEM_SLEEP_PM_OPS(zynq_gpio_suspend, zynq_gpio_resume)
611 SET_RUNTIME_PM_OPS(zynq_gpio_runtime_suspend,
612 zynq_gpio_runtime_resume, NULL)
615 static const struct zynq_platform_data zynqmp_gpio_def = {
616 .label = "zynqmp_gpio",
617 .ngpio = ZYNQMP_GPIO_NR_GPIOS,
618 .max_bank = ZYNQMP_GPIO_MAX_BANK,
619 .bank_min[0] = ZYNQ_GPIO_BANK0_PIN_MIN(MP),
620 .bank_max[0] = ZYNQ_GPIO_BANK0_PIN_MAX(MP),
621 .bank_min[1] = ZYNQ_GPIO_BANK1_PIN_MIN(MP),
622 .bank_max[1] = ZYNQ_GPIO_BANK1_PIN_MAX(MP),
623 .bank_min[2] = ZYNQ_GPIO_BANK2_PIN_MIN(MP),
624 .bank_max[2] = ZYNQ_GPIO_BANK2_PIN_MAX(MP),
625 .bank_min[3] = ZYNQ_GPIO_BANK3_PIN_MIN(MP),
626 .bank_max[3] = ZYNQ_GPIO_BANK3_PIN_MAX(MP),
627 .bank_min[4] = ZYNQ_GPIO_BANK4_PIN_MIN(MP),
628 .bank_max[4] = ZYNQ_GPIO_BANK4_PIN_MAX(MP),
629 .bank_min[5] = ZYNQ_GPIO_BANK5_PIN_MIN(MP),
630 .bank_max[5] = ZYNQ_GPIO_BANK5_PIN_MAX(MP),
633 static const struct zynq_platform_data zynq_gpio_def = {
634 .label = "zynq_gpio",
635 .ngpio = ZYNQ_GPIO_NR_GPIOS,
636 .max_bank = ZYNQ_GPIO_MAX_BANK,
637 .bank_min[0] = ZYNQ_GPIO_BANK0_PIN_MIN(),
638 .bank_max[0] = ZYNQ_GPIO_BANK0_PIN_MAX(),
639 .bank_min[1] = ZYNQ_GPIO_BANK1_PIN_MIN(),
640 .bank_max[1] = ZYNQ_GPIO_BANK1_PIN_MAX(),
641 .bank_min[2] = ZYNQ_GPIO_BANK2_PIN_MIN(),
642 .bank_max[2] = ZYNQ_GPIO_BANK2_PIN_MAX(),
643 .bank_min[3] = ZYNQ_GPIO_BANK3_PIN_MIN(),
644 .bank_max[3] = ZYNQ_GPIO_BANK3_PIN_MAX(),
647 static const struct of_device_id zynq_gpio_of_match[] = {
648 { .compatible = "xlnx,zynq-gpio-1.0", .data = (void *)&zynq_gpio_def },
649 { .compatible = "xlnx,zynqmp-gpio-1.0",
650 .data = (void *)&zynqmp_gpio_def },
651 { /* end of table */ }
653 MODULE_DEVICE_TABLE(of, zynq_gpio_of_match);
656 * zynq_gpio_probe - Initialization method for a zynq_gpio device
657 * @pdev: platform device instance
659 * This function allocates memory resources for the gpio device and registers
660 * all the banks of the device. It will also set up interrupts for the gpio
662 * Note: Interrupts are disabled for all the banks during initialization.
664 * Return: 0 on success, negative error otherwise.
666 static int zynq_gpio_probe(struct platform_device *pdev)
669 struct zynq_gpio *gpio;
670 struct gpio_chip *chip;
671 struct resource *res;
672 const struct of_device_id *match;
674 gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
678 match = of_match_node(zynq_gpio_of_match, pdev->dev.of_node);
680 dev_err(&pdev->dev, "of_match_node() failed\n");
683 gpio->p_data = match->data;
684 platform_set_drvdata(pdev, gpio);
686 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
687 gpio->base_addr = devm_ioremap_resource(&pdev->dev, res);
688 if (IS_ERR(gpio->base_addr))
689 return PTR_ERR(gpio->base_addr);
691 gpio->irq = platform_get_irq(pdev, 0);
693 dev_err(&pdev->dev, "invalid IRQ\n");
697 /* configure the gpio chip */
699 chip->label = gpio->p_data->label;
700 chip->owner = THIS_MODULE;
701 chip->dev = &pdev->dev;
702 chip->get = zynq_gpio_get_value;
703 chip->set = zynq_gpio_set_value;
704 chip->request = zynq_gpio_request;
705 chip->free = zynq_gpio_free;
706 chip->direction_input = zynq_gpio_dir_in;
707 chip->direction_output = zynq_gpio_dir_out;
709 chip->ngpio = gpio->p_data->ngpio;
711 /* Enable GPIO clock */
712 gpio->clk = devm_clk_get(&pdev->dev, NULL);
713 if (IS_ERR(gpio->clk)) {
714 dev_err(&pdev->dev, "input clock not found.\n");
715 return PTR_ERR(gpio->clk);
717 ret = clk_prepare_enable(gpio->clk);
719 dev_err(&pdev->dev, "Unable to enable clock.\n");
723 /* report a bug if gpio chip registration fails */
724 ret = gpiochip_add(chip);
726 dev_err(&pdev->dev, "Failed to add gpio chip\n");
727 goto err_disable_clk;
730 /* disable interrupts for all banks */
731 for (bank_num = 0; bank_num < gpio->p_data->max_bank; bank_num++)
732 writel_relaxed(ZYNQ_GPIO_IXR_DISABLE_ALL, gpio->base_addr +
733 ZYNQ_GPIO_INTDIS_OFFSET(bank_num));
735 ret = gpiochip_irqchip_add(chip, &zynq_gpio_edge_irqchip, 0,
736 handle_level_irq, IRQ_TYPE_NONE);
738 dev_err(&pdev->dev, "Failed to add irq chip\n");
739 goto err_rm_gpiochip;
742 gpiochip_set_chained_irqchip(chip, &zynq_gpio_edge_irqchip, gpio->irq,
743 zynq_gpio_irqhandler);
745 pm_runtime_set_active(&pdev->dev);
746 pm_runtime_enable(&pdev->dev);
751 gpiochip_remove(chip);
753 clk_disable_unprepare(gpio->clk);
759 * zynq_gpio_remove - Driver removal function
760 * @pdev: platform device instance
764 static int zynq_gpio_remove(struct platform_device *pdev)
766 struct zynq_gpio *gpio = platform_get_drvdata(pdev);
768 pm_runtime_get_sync(&pdev->dev);
769 gpiochip_remove(&gpio->chip);
770 clk_disable_unprepare(gpio->clk);
771 device_set_wakeup_capable(&pdev->dev, 0);
772 pm_runtime_disable(&pdev->dev);
776 static struct platform_driver zynq_gpio_driver = {
779 .pm = &zynq_gpio_dev_pm_ops,
780 .of_match_table = zynq_gpio_of_match,
782 .probe = zynq_gpio_probe,
783 .remove = zynq_gpio_remove,
787 * zynq_gpio_init - Initial driver registration call
789 * Return: value from platform_driver_register
791 static int __init zynq_gpio_init(void)
793 return platform_driver_register(&zynq_gpio_driver);
795 postcore_initcall(zynq_gpio_init);
797 static void __exit zynq_gpio_exit(void)
799 platform_driver_unregister(&zynq_gpio_driver);
801 module_exit(zynq_gpio_exit);
803 MODULE_AUTHOR("Xilinx Inc.");
804 MODULE_DESCRIPTION("Zynq GPIO driver");
805 MODULE_LICENSE("GPL");