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1/*
2 * Xilinx Zynq GPIO device driver
3 *
4 * Copyright (C) 2009 - 2014 Xilinx, Inc.
5 *
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
9 * version.
10 */
11
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>
17#include <linux/io.h>
18#include <linux/module.h>
19#include <linux/platform_device.h>
20#include <linux/pm_runtime.h>
21#include <linux/of.h>
22
23#define DRIVER_NAME "zynq-gpio"
24
25/* Maximum banks */
26#define ZYNQ_GPIO_MAX_BANK 4
27#define ZYNQMP_GPIO_MAX_BANK 6
28
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
33
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
40
41#define ZYNQ_GPIO_NR_GPIOS 118
42#define ZYNQMP_GPIO_NR_GPIOS 174
43
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)
62
63/* Register offsets for the GPIO device */
64/* LSW Mask & Data -WO */
65#define ZYNQ_GPIO_DATA_LSW_OFFSET(BANK) (0x000 + (8 * BANK))
66/* MSW Mask & Data -WO */
67#define ZYNQ_GPIO_DATA_MSW_OFFSET(BANK) (0x004 + (8 * BANK))
68/* Data Register-RW */
69#define ZYNQ_GPIO_DATA_OFFSET(BANK) (0x040 + (4 * BANK))
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))
89
90/* Disable all interrupts mask */
91#define ZYNQ_GPIO_IXR_DISABLE_ALL 0xFFFFFFFF
92
93/* Mid pin number of a bank */
94#define ZYNQ_GPIO_MID_PIN_NUM 16
95
96/* GPIO upper 16 bit mask */
97#define ZYNQ_GPIO_UPPER_MASK 0xFFFF0000
98
99/* set to differentiate zynq from zynqmp, 0=zynqmp, 1=zynq */
100#define ZYNQ_GPIO_QUIRK_IS_ZYNQ BIT(0)
101#define GPIO_QUIRK_DATA_RO_BUG BIT(1)
102
103struct gpio_regs {
104 u32 datamsw[ZYNQMP_GPIO_MAX_BANK];
105 u32 datalsw[ZYNQMP_GPIO_MAX_BANK];
106 u32 dirm[ZYNQMP_GPIO_MAX_BANK];
107 u32 outen[ZYNQMP_GPIO_MAX_BANK];
108 u32 int_en[ZYNQMP_GPIO_MAX_BANK];
109 u32 int_dis[ZYNQMP_GPIO_MAX_BANK];
110 u32 int_type[ZYNQMP_GPIO_MAX_BANK];
111 u32 int_polarity[ZYNQMP_GPIO_MAX_BANK];
112 u32 int_any[ZYNQMP_GPIO_MAX_BANK];
113};
114
115/**
116 * struct zynq_gpio - gpio device private data structure
117 * @chip: instance of the gpio_chip
118 * @base_addr: base address of the GPIO device
119 * @clk: clock resource for this controller
120 * @irq: interrupt for the GPIO device
121 * @p_data: pointer to platform data
122 * @context: context registers
123 */
124struct zynq_gpio {
125 struct gpio_chip chip;
126 void __iomem *base_addr;
127 struct clk *clk;
128 int irq;
129 const struct zynq_platform_data *p_data;
130 struct gpio_regs context;
131};
132
133/**
134 * struct zynq_platform_data - zynq gpio platform data structure
135 * @label: string to store in gpio->label
136 * @quirks: Flags is used to identify the platform
137 * @ngpio: max number of gpio pins
138 * @max_bank: maximum number of gpio banks
139 * @bank_min: this array represents bank's min pin
140 * @bank_max: this array represents bank's max pin
141 */
142struct zynq_platform_data {
143 const char *label;
144 u32 quirks;
145 u16 ngpio;
146 int max_bank;
147 int bank_min[ZYNQMP_GPIO_MAX_BANK];
148 int bank_max[ZYNQMP_GPIO_MAX_BANK];
149};
150
151static struct irq_chip zynq_gpio_level_irqchip;
152static struct irq_chip zynq_gpio_edge_irqchip;
153
154/**
155 * zynq_gpio_is_zynq - test if HW is zynq or zynqmp
156 * @gpio: Pointer to driver data struct
157 *
158 * Return: 0 if zynqmp, 1 if zynq.
159 */
160static int zynq_gpio_is_zynq(struct zynq_gpio *gpio)
161{
162 return !!(gpio->p_data->quirks & ZYNQ_GPIO_QUIRK_IS_ZYNQ);
163}
164
165/**
166 * gpio_data_ro_bug - test if HW bug exists or not
167 * @gpio: Pointer to driver data struct
168 *
169 * Return: 0 if bug doesnot exist, 1 if bug exists.
170 */
171static int gpio_data_ro_bug(struct zynq_gpio *gpio)
172{
173 return !!(gpio->p_data->quirks & GPIO_QUIRK_DATA_RO_BUG);
174}
175
176/**
177 * zynq_gpio_get_bank_pin - Get the bank number and pin number within that bank
178 * for a given pin in the GPIO device
179 * @pin_num: gpio pin number within the device
180 * @bank_num: an output parameter used to return the bank number of the gpio
181 * pin
182 * @bank_pin_num: an output parameter used to return pin number within a bank
183 * for the given gpio pin
184 * @gpio: gpio device data structure
185 *
186 * Returns the bank number and pin offset within the bank.
187 */
188static inline void zynq_gpio_get_bank_pin(unsigned int pin_num,
189 unsigned int *bank_num,
190 unsigned int *bank_pin_num,
191 struct zynq_gpio *gpio)
192{
193 int bank;
194
195 for (bank = 0; bank < gpio->p_data->max_bank; bank++) {
196 if ((pin_num >= gpio->p_data->bank_min[bank]) &&
197 (pin_num <= gpio->p_data->bank_max[bank])) {
198 *bank_num = bank;
199 *bank_pin_num = pin_num -
200 gpio->p_data->bank_min[bank];
201 return;
202 }
203 }
204
205 /* default */
206 WARN(true, "invalid GPIO pin number: %u", pin_num);
207 *bank_num = 0;
208 *bank_pin_num = 0;
209}
210
211/**
212 * zynq_gpio_get_value - Get the state of the specified pin of GPIO device
213 * @chip: gpio_chip instance to be worked on
214 * @pin: gpio pin number within the device
215 *
216 * This function reads the state of the specified pin of the GPIO device.
217 *
218 * Return: 0 if the pin is low, 1 if pin is high.
219 */
220static int zynq_gpio_get_value(struct gpio_chip *chip, unsigned int pin)
221{
222 u32 data;
223 unsigned int bank_num, bank_pin_num;
224 struct zynq_gpio *gpio = gpiochip_get_data(chip);
225
226 zynq_gpio_get_bank_pin(pin, &bank_num, &bank_pin_num, gpio);
227
228 if (gpio_data_ro_bug(gpio)) {
229 if (zynq_gpio_is_zynq(gpio)) {
230 if (bank_num <= 1) {
231 data = readl_relaxed(gpio->base_addr +
232 ZYNQ_GPIO_DATA_RO_OFFSET(bank_num));
233 } else {
234 data = readl_relaxed(gpio->base_addr +
235 ZYNQ_GPIO_DATA_OFFSET(bank_num));
236 }
237 } else {
238 if (bank_num <= 2) {
239 data = readl_relaxed(gpio->base_addr +
240 ZYNQ_GPIO_DATA_RO_OFFSET(bank_num));
241 } else {
242 data = readl_relaxed(gpio->base_addr +
243 ZYNQ_GPIO_DATA_OFFSET(bank_num));
244 }
245 }
246 } else {
247 data = readl_relaxed(gpio->base_addr +
248 ZYNQ_GPIO_DATA_RO_OFFSET(bank_num));
249 }
250 return (data >> bank_pin_num) & 1;
251}
252
253/**
254 * zynq_gpio_set_value - Modify the state of the pin with specified value
255 * @chip: gpio_chip instance to be worked on
256 * @pin: gpio pin number within the device
257 * @state: value used to modify the state of the specified pin
258 *
259 * This function calculates the register offset (i.e to lower 16 bits or
260 * upper 16 bits) based on the given pin number and sets the state of a
261 * gpio pin to the specified value. The state is either 0 or non-zero.
262 */
263static void zynq_gpio_set_value(struct gpio_chip *chip, unsigned int pin,
264 int state)
265{
266 unsigned int reg_offset, bank_num, bank_pin_num;
267 struct zynq_gpio *gpio = gpiochip_get_data(chip);
268
269 zynq_gpio_get_bank_pin(pin, &bank_num, &bank_pin_num, gpio);
270
271 if (bank_pin_num >= ZYNQ_GPIO_MID_PIN_NUM) {
272 /* only 16 data bits in bit maskable reg */
273 bank_pin_num -= ZYNQ_GPIO_MID_PIN_NUM;
274 reg_offset = ZYNQ_GPIO_DATA_MSW_OFFSET(bank_num);
275 } else {
276 reg_offset = ZYNQ_GPIO_DATA_LSW_OFFSET(bank_num);
277 }
278
279 /*
280 * get the 32 bit value to be written to the mask/data register where
281 * the upper 16 bits is the mask and lower 16 bits is the data
282 */
283 state = !!state;
284 state = ~(1 << (bank_pin_num + ZYNQ_GPIO_MID_PIN_NUM)) &
285 ((state << bank_pin_num) | ZYNQ_GPIO_UPPER_MASK);
286
287 writel_relaxed(state, gpio->base_addr + reg_offset);
288}
289
290/**
291 * zynq_gpio_dir_in - Set the direction of the specified GPIO pin as input
292 * @chip: gpio_chip instance to be worked on
293 * @pin: gpio pin number within the device
294 *
295 * This function uses the read-modify-write sequence to set the direction of
296 * the gpio pin as input.
297 *
298 * Return: 0 always
299 */
300static int zynq_gpio_dir_in(struct gpio_chip *chip, unsigned int pin)
301{
302 u32 reg;
303 unsigned int bank_num, bank_pin_num;
304 struct zynq_gpio *gpio = gpiochip_get_data(chip);
305
306 zynq_gpio_get_bank_pin(pin, &bank_num, &bank_pin_num, gpio);
307
308 /*
309 * On zynq bank 0 pins 7 and 8 are special and cannot be used
310 * as inputs.
311 */
312 if (zynq_gpio_is_zynq(gpio) && bank_num == 0 &&
313 (bank_pin_num == 7 || bank_pin_num == 8))
314 return -EINVAL;
315
316 /* clear the bit in direction mode reg to set the pin as input */
317 reg = readl_relaxed(gpio->base_addr + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
318 reg &= ~BIT(bank_pin_num);
319 writel_relaxed(reg, gpio->base_addr + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
320
321 return 0;
322}
323
324/**
325 * zynq_gpio_dir_out - Set the direction of the specified GPIO pin as output
326 * @chip: gpio_chip instance to be worked on
327 * @pin: gpio pin number within the device
328 * @state: value to be written to specified pin
329 *
330 * This function sets the direction of specified GPIO pin as output, configures
331 * the Output Enable register for the pin and uses zynq_gpio_set to set
332 * the state of the pin to the value specified.
333 *
334 * Return: 0 always
335 */
336static int zynq_gpio_dir_out(struct gpio_chip *chip, unsigned int pin,
337 int state)
338{
339 u32 reg;
340 unsigned int bank_num, bank_pin_num;
341 struct zynq_gpio *gpio = gpiochip_get_data(chip);
342
343 zynq_gpio_get_bank_pin(pin, &bank_num, &bank_pin_num, gpio);
344
345 /* set the GPIO pin as output */
346 reg = readl_relaxed(gpio->base_addr + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
347 reg |= BIT(bank_pin_num);
348 writel_relaxed(reg, gpio->base_addr + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
349
350 /* configure the output enable reg for the pin */
351 reg = readl_relaxed(gpio->base_addr + ZYNQ_GPIO_OUTEN_OFFSET(bank_num));
352 reg |= BIT(bank_pin_num);
353 writel_relaxed(reg, gpio->base_addr + ZYNQ_GPIO_OUTEN_OFFSET(bank_num));
354
355 /* set the state of the pin */
356 zynq_gpio_set_value(chip, pin, state);
357 return 0;
358}
359
360/**
361 * zynq_gpio_get_direction - Read the direction of the specified GPIO pin
362 * @chip: gpio_chip instance to be worked on
363 * @pin: gpio pin number within the device
364 *
365 * This function returns the direction of the specified GPIO.
366 *
367 * Return: 0 for output, 1 for input
368 */
369static int zynq_gpio_get_direction(struct gpio_chip *chip, unsigned int pin)
370{
371 u32 reg;
372 unsigned int bank_num, bank_pin_num;
373 struct zynq_gpio *gpio = gpiochip_get_data(chip);
374
375 zynq_gpio_get_bank_pin(pin, &bank_num, &bank_pin_num, gpio);
376
377 reg = readl_relaxed(gpio->base_addr + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
378
379 return !(reg & BIT(bank_pin_num));
380}
381
382/**
383 * zynq_gpio_irq_mask - Disable the interrupts for a gpio pin
384 * @irq_data: per irq and chip data passed down to chip functions
385 *
386 * This function calculates gpio pin number from irq number and sets the
387 * bit in the Interrupt Disable register of the corresponding bank to disable
388 * interrupts for that pin.
389 */
390static void zynq_gpio_irq_mask(struct irq_data *irq_data)
391{
392 unsigned int device_pin_num, bank_num, bank_pin_num;
393 struct zynq_gpio *gpio =
394 gpiochip_get_data(irq_data_get_irq_chip_data(irq_data));
395
396 device_pin_num = irq_data->hwirq;
397 zynq_gpio_get_bank_pin(device_pin_num, &bank_num, &bank_pin_num, gpio);
398 writel_relaxed(BIT(bank_pin_num),
399 gpio->base_addr + ZYNQ_GPIO_INTDIS_OFFSET(bank_num));
400}
401
402/**
403 * zynq_gpio_irq_unmask - Enable the interrupts for a gpio pin
404 * @irq_data: irq data containing irq number of gpio pin for the interrupt
405 * to enable
406 *
407 * This function calculates the gpio pin number from irq number and sets the
408 * bit in the Interrupt Enable register of the corresponding bank to enable
409 * interrupts for that pin.
410 */
411static void zynq_gpio_irq_unmask(struct irq_data *irq_data)
412{
413 unsigned int device_pin_num, bank_num, bank_pin_num;
414 struct zynq_gpio *gpio =
415 gpiochip_get_data(irq_data_get_irq_chip_data(irq_data));
416
417 device_pin_num = irq_data->hwirq;
418 zynq_gpio_get_bank_pin(device_pin_num, &bank_num, &bank_pin_num, gpio);
419 writel_relaxed(BIT(bank_pin_num),
420 gpio->base_addr + ZYNQ_GPIO_INTEN_OFFSET(bank_num));
421}
422
423/**
424 * zynq_gpio_irq_ack - Acknowledge the interrupt of a gpio pin
425 * @irq_data: irq data containing irq number of gpio pin for the interrupt
426 * to ack
427 *
428 * This function calculates gpio pin number from irq number and sets the bit
429 * in the Interrupt Status Register of the corresponding bank, to ACK the irq.
430 */
431static void zynq_gpio_irq_ack(struct irq_data *irq_data)
432{
433 unsigned int device_pin_num, bank_num, bank_pin_num;
434 struct zynq_gpio *gpio =
435 gpiochip_get_data(irq_data_get_irq_chip_data(irq_data));
436
437 device_pin_num = irq_data->hwirq;
438 zynq_gpio_get_bank_pin(device_pin_num, &bank_num, &bank_pin_num, gpio);
439 writel_relaxed(BIT(bank_pin_num),
440 gpio->base_addr + ZYNQ_GPIO_INTSTS_OFFSET(bank_num));
441}
442
443/**
444 * zynq_gpio_irq_enable - Enable the interrupts for a gpio pin
445 * @irq_data: irq data containing irq number of gpio pin for the interrupt
446 * to enable
447 *
448 * Clears the INTSTS bit and unmasks the given interrupt.
449 */
450static void zynq_gpio_irq_enable(struct irq_data *irq_data)
451{
452 /*
453 * The Zynq GPIO controller does not disable interrupt detection when
454 * the interrupt is masked and only disables the propagation of the
455 * interrupt. This means when the controller detects an interrupt
456 * condition while the interrupt is logically disabled it will propagate
457 * that interrupt event once the interrupt is enabled. This will cause
458 * the interrupt consumer to see spurious interrupts to prevent this
459 * first make sure that the interrupt is not asserted and then enable
460 * it.
461 */
462 zynq_gpio_irq_ack(irq_data);
463 zynq_gpio_irq_unmask(irq_data);
464}
465
466/**
467 * zynq_gpio_set_irq_type - Set the irq type for a gpio pin
468 * @irq_data: irq data containing irq number of gpio pin
469 * @type: interrupt type that is to be set for the gpio pin
470 *
471 * This function gets the gpio pin number and its bank from the gpio pin number
472 * and configures the INT_TYPE, INT_POLARITY and INT_ANY registers.
473 *
474 * Return: 0, negative error otherwise.
475 * TYPE-EDGE_RISING, INT_TYPE - 1, INT_POLARITY - 1, INT_ANY - 0;
476 * TYPE-EDGE_FALLING, INT_TYPE - 1, INT_POLARITY - 0, INT_ANY - 0;
477 * TYPE-EDGE_BOTH, INT_TYPE - 1, INT_POLARITY - NA, INT_ANY - 1;
478 * TYPE-LEVEL_HIGH, INT_TYPE - 0, INT_POLARITY - 1, INT_ANY - NA;
479 * TYPE-LEVEL_LOW, INT_TYPE - 0, INT_POLARITY - 0, INT_ANY - NA
480 */
481static int zynq_gpio_set_irq_type(struct irq_data *irq_data, unsigned int type)
482{
483 u32 int_type, int_pol, int_any;
484 unsigned int device_pin_num, bank_num, bank_pin_num;
485 struct zynq_gpio *gpio =
486 gpiochip_get_data(irq_data_get_irq_chip_data(irq_data));
487
488 device_pin_num = irq_data->hwirq;
489 zynq_gpio_get_bank_pin(device_pin_num, &bank_num, &bank_pin_num, gpio);
490
491 int_type = readl_relaxed(gpio->base_addr +
492 ZYNQ_GPIO_INTTYPE_OFFSET(bank_num));
493 int_pol = readl_relaxed(gpio->base_addr +
494 ZYNQ_GPIO_INTPOL_OFFSET(bank_num));
495 int_any = readl_relaxed(gpio->base_addr +
496 ZYNQ_GPIO_INTANY_OFFSET(bank_num));
497
498 /*
499 * based on the type requested, configure the INT_TYPE, INT_POLARITY
500 * and INT_ANY registers
501 */
502 switch (type) {
503 case IRQ_TYPE_EDGE_RISING:
504 int_type |= BIT(bank_pin_num);
505 int_pol |= BIT(bank_pin_num);
506 int_any &= ~BIT(bank_pin_num);
507 break;
508 case IRQ_TYPE_EDGE_FALLING:
509 int_type |= BIT(bank_pin_num);
510 int_pol &= ~BIT(bank_pin_num);
511 int_any &= ~BIT(bank_pin_num);
512 break;
513 case IRQ_TYPE_EDGE_BOTH:
514 int_type |= BIT(bank_pin_num);
515 int_any |= BIT(bank_pin_num);
516 break;
517 case IRQ_TYPE_LEVEL_HIGH:
518 int_type &= ~BIT(bank_pin_num);
519 int_pol |= BIT(bank_pin_num);
520 break;
521 case IRQ_TYPE_LEVEL_LOW:
522 int_type &= ~BIT(bank_pin_num);
523 int_pol &= ~BIT(bank_pin_num);
524 break;
525 default:
526 return -EINVAL;
527 }
528
529 writel_relaxed(int_type,
530 gpio->base_addr + ZYNQ_GPIO_INTTYPE_OFFSET(bank_num));
531 writel_relaxed(int_pol,
532 gpio->base_addr + ZYNQ_GPIO_INTPOL_OFFSET(bank_num));
533 writel_relaxed(int_any,
534 gpio->base_addr + ZYNQ_GPIO_INTANY_OFFSET(bank_num));
535
536 if (type & IRQ_TYPE_LEVEL_MASK)
537 irq_set_chip_handler_name_locked(irq_data,
538 &zynq_gpio_level_irqchip,
539 handle_fasteoi_irq, NULL);
540 else
541 irq_set_chip_handler_name_locked(irq_data,
542 &zynq_gpio_edge_irqchip,
543 handle_level_irq, NULL);
544
545 return 0;
546}
547
548static int zynq_gpio_set_wake(struct irq_data *data, unsigned int on)
549{
550 struct zynq_gpio *gpio =
551 gpiochip_get_data(irq_data_get_irq_chip_data(data));
552
553 irq_set_irq_wake(gpio->irq, on);
554
555 return 0;
556}
557
558static int zynq_gpio_irq_reqres(struct irq_data *d)
559{
560 struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
561 int ret;
562
563 ret = pm_runtime_get_sync(chip->parent);
564 if (ret < 0)
565 return ret;
566
567 return gpiochip_reqres_irq(chip, d->hwirq);
568}
569
570static void zynq_gpio_irq_relres(struct irq_data *d)
571{
572 struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
573
574 gpiochip_relres_irq(chip, d->hwirq);
575 pm_runtime_put(chip->parent);
576}
577
578/* irq chip descriptor */
579static struct irq_chip zynq_gpio_level_irqchip = {
580 .name = DRIVER_NAME,
581 .irq_enable = zynq_gpio_irq_enable,
582 .irq_eoi = zynq_gpio_irq_ack,
583 .irq_mask = zynq_gpio_irq_mask,
584 .irq_unmask = zynq_gpio_irq_unmask,
585 .irq_set_type = zynq_gpio_set_irq_type,
586 .irq_set_wake = zynq_gpio_set_wake,
587 .irq_request_resources = zynq_gpio_irq_reqres,
588 .irq_release_resources = zynq_gpio_irq_relres,
589 .flags = IRQCHIP_EOI_THREADED | IRQCHIP_EOI_IF_HANDLED |
590 IRQCHIP_MASK_ON_SUSPEND,
591};
592
593static struct irq_chip zynq_gpio_edge_irqchip = {
594 .name = DRIVER_NAME,
595 .irq_enable = zynq_gpio_irq_enable,
596 .irq_ack = zynq_gpio_irq_ack,
597 .irq_mask = zynq_gpio_irq_mask,
598 .irq_unmask = zynq_gpio_irq_unmask,
599 .irq_set_type = zynq_gpio_set_irq_type,
600 .irq_set_wake = zynq_gpio_set_wake,
601 .irq_request_resources = zynq_gpio_irq_reqres,
602 .irq_release_resources = zynq_gpio_irq_relres,
603 .flags = IRQCHIP_MASK_ON_SUSPEND,
604};
605
606static void zynq_gpio_handle_bank_irq(struct zynq_gpio *gpio,
607 unsigned int bank_num,
608 unsigned long pending)
609{
610 unsigned int bank_offset = gpio->p_data->bank_min[bank_num];
611 struct irq_domain *irqdomain = gpio->chip.irq.domain;
612 int offset;
613
614 if (!pending)
615 return;
616
617 for_each_set_bit(offset, &pending, 32) {
618 unsigned int gpio_irq;
619
620 gpio_irq = irq_find_mapping(irqdomain, offset + bank_offset);
621 generic_handle_irq(gpio_irq);
622 }
623}
624
625/**
626 * zynq_gpio_irqhandler - IRQ handler for the gpio banks of a gpio device
627 * @desc: irq descriptor instance of the 'irq'
628 *
629 * This function reads the Interrupt Status Register of each bank to get the
630 * gpio pin number which has triggered an interrupt. It then acks the triggered
631 * interrupt and calls the pin specific handler set by the higher layer
632 * application for that pin.
633 * Note: A bug is reported if no handler is set for the gpio pin.
634 */
635static void zynq_gpio_irqhandler(struct irq_desc *desc)
636{
637 u32 int_sts, int_enb;
638 unsigned int bank_num;
639 struct zynq_gpio *gpio =
640 gpiochip_get_data(irq_desc_get_handler_data(desc));
641 struct irq_chip *irqchip = irq_desc_get_chip(desc);
642
643 chained_irq_enter(irqchip, desc);
644
645 for (bank_num = 0; bank_num < gpio->p_data->max_bank; bank_num++) {
646 int_sts = readl_relaxed(gpio->base_addr +
647 ZYNQ_GPIO_INTSTS_OFFSET(bank_num));
648 int_enb = readl_relaxed(gpio->base_addr +
649 ZYNQ_GPIO_INTMASK_OFFSET(bank_num));
650 zynq_gpio_handle_bank_irq(gpio, bank_num, int_sts & ~int_enb);
651 }
652
653 chained_irq_exit(irqchip, desc);
654}
655
656static void zynq_gpio_save_context(struct zynq_gpio *gpio)
657{
658 unsigned int bank_num;
659
660 for (bank_num = 0; bank_num < gpio->p_data->max_bank; bank_num++) {
661 gpio->context.datalsw[bank_num] =
662 readl_relaxed(gpio->base_addr +
663 ZYNQ_GPIO_DATA_LSW_OFFSET(bank_num));
664 gpio->context.datamsw[bank_num] =
665 readl_relaxed(gpio->base_addr +
666 ZYNQ_GPIO_DATA_MSW_OFFSET(bank_num));
667 gpio->context.dirm[bank_num] = readl_relaxed(gpio->base_addr +
668 ZYNQ_GPIO_DIRM_OFFSET(bank_num));
669 gpio->context.int_en[bank_num] = readl_relaxed(gpio->base_addr +
670 ZYNQ_GPIO_INTMASK_OFFSET(bank_num));
671 gpio->context.int_type[bank_num] =
672 readl_relaxed(gpio->base_addr +
673 ZYNQ_GPIO_INTTYPE_OFFSET(bank_num));
674 gpio->context.int_polarity[bank_num] =
675 readl_relaxed(gpio->base_addr +
676 ZYNQ_GPIO_INTPOL_OFFSET(bank_num));
677 gpio->context.int_any[bank_num] =
678 readl_relaxed(gpio->base_addr +
679 ZYNQ_GPIO_INTANY_OFFSET(bank_num));
680 }
681}
682
683static void zynq_gpio_restore_context(struct zynq_gpio *gpio)
684{
685 unsigned int bank_num;
686
687 for (bank_num = 0; bank_num < gpio->p_data->max_bank; bank_num++) {
688 writel_relaxed(gpio->context.datalsw[bank_num],
689 gpio->base_addr +
690 ZYNQ_GPIO_DATA_LSW_OFFSET(bank_num));
691 writel_relaxed(gpio->context.datamsw[bank_num],
692 gpio->base_addr +
693 ZYNQ_GPIO_DATA_MSW_OFFSET(bank_num));
694 writel_relaxed(gpio->context.dirm[bank_num],
695 gpio->base_addr +
696 ZYNQ_GPIO_DIRM_OFFSET(bank_num));
697 writel_relaxed(gpio->context.int_en[bank_num],
698 gpio->base_addr +
699 ZYNQ_GPIO_INTEN_OFFSET(bank_num));
700 writel_relaxed(gpio->context.int_type[bank_num],
701 gpio->base_addr +
702 ZYNQ_GPIO_INTTYPE_OFFSET(bank_num));
703 writel_relaxed(gpio->context.int_polarity[bank_num],
704 gpio->base_addr +
705 ZYNQ_GPIO_INTPOL_OFFSET(bank_num));
706 writel_relaxed(gpio->context.int_any[bank_num],
707 gpio->base_addr +
708 ZYNQ_GPIO_INTANY_OFFSET(bank_num));
709 }
710}
711
712static int __maybe_unused zynq_gpio_suspend(struct device *dev)
713{
714 struct zynq_gpio *gpio = dev_get_drvdata(dev);
715 struct irq_data *data = irq_get_irq_data(gpio->irq);
716
717 if (!irqd_is_wakeup_set(data)) {
718 zynq_gpio_save_context(gpio);
719 return pm_runtime_force_suspend(dev);
720 }
721
722 return 0;
723}
724
725static int __maybe_unused zynq_gpio_resume(struct device *dev)
726{
727 struct zynq_gpio *gpio = dev_get_drvdata(dev);
728 struct irq_data *data = irq_get_irq_data(gpio->irq);
729 int ret;
730
731 if (!irqd_is_wakeup_set(data)) {
732 ret = pm_runtime_force_resume(dev);
733 zynq_gpio_restore_context(gpio);
734 return ret;
735 }
736
737 return 0;
738}
739
740static int __maybe_unused zynq_gpio_runtime_suspend(struct device *dev)
741{
742 struct zynq_gpio *gpio = dev_get_drvdata(dev);
743
744 clk_disable_unprepare(gpio->clk);
745
746 return 0;
747}
748
749static int __maybe_unused zynq_gpio_runtime_resume(struct device *dev)
750{
751 struct zynq_gpio *gpio = dev_get_drvdata(dev);
752
753 return clk_prepare_enable(gpio->clk);
754}
755
756static int zynq_gpio_request(struct gpio_chip *chip, unsigned int offset)
757{
758 int ret;
759
760 ret = pm_runtime_get_sync(chip->parent);
761
762 /*
763 * If the device is already active pm_runtime_get() will return 1 on
764 * success, but gpio_request still needs to return 0.
765 */
766 return ret < 0 ? ret : 0;
767}
768
769static void zynq_gpio_free(struct gpio_chip *chip, unsigned int offset)
770{
771 pm_runtime_put(chip->parent);
772}
773
774static const struct dev_pm_ops zynq_gpio_dev_pm_ops = {
775 SET_SYSTEM_SLEEP_PM_OPS(zynq_gpio_suspend, zynq_gpio_resume)
776 SET_RUNTIME_PM_OPS(zynq_gpio_runtime_suspend,
777 zynq_gpio_runtime_resume, NULL)
778};
779
780static const struct zynq_platform_data zynqmp_gpio_def = {
781 .label = "zynqmp_gpio",
782 .quirks = GPIO_QUIRK_DATA_RO_BUG,
783 .ngpio = ZYNQMP_GPIO_NR_GPIOS,
784 .max_bank = ZYNQMP_GPIO_MAX_BANK,
785 .bank_min[0] = ZYNQ_GPIO_BANK0_PIN_MIN(MP),
786 .bank_max[0] = ZYNQ_GPIO_BANK0_PIN_MAX(MP),
787 .bank_min[1] = ZYNQ_GPIO_BANK1_PIN_MIN(MP),
788 .bank_max[1] = ZYNQ_GPIO_BANK1_PIN_MAX(MP),
789 .bank_min[2] = ZYNQ_GPIO_BANK2_PIN_MIN(MP),
790 .bank_max[2] = ZYNQ_GPIO_BANK2_PIN_MAX(MP),
791 .bank_min[3] = ZYNQ_GPIO_BANK3_PIN_MIN(MP),
792 .bank_max[3] = ZYNQ_GPIO_BANK3_PIN_MAX(MP),
793 .bank_min[4] = ZYNQ_GPIO_BANK4_PIN_MIN(MP),
794 .bank_max[4] = ZYNQ_GPIO_BANK4_PIN_MAX(MP),
795 .bank_min[5] = ZYNQ_GPIO_BANK5_PIN_MIN(MP),
796 .bank_max[5] = ZYNQ_GPIO_BANK5_PIN_MAX(MP),
797};
798
799static const struct zynq_platform_data zynq_gpio_def = {
800 .label = "zynq_gpio",
801 .quirks = ZYNQ_GPIO_QUIRK_IS_ZYNQ | GPIO_QUIRK_DATA_RO_BUG,
802 .ngpio = ZYNQ_GPIO_NR_GPIOS,
803 .max_bank = ZYNQ_GPIO_MAX_BANK,
804 .bank_min[0] = ZYNQ_GPIO_BANK0_PIN_MIN(),
805 .bank_max[0] = ZYNQ_GPIO_BANK0_PIN_MAX(),
806 .bank_min[1] = ZYNQ_GPIO_BANK1_PIN_MIN(),
807 .bank_max[1] = ZYNQ_GPIO_BANK1_PIN_MAX(),
808 .bank_min[2] = ZYNQ_GPIO_BANK2_PIN_MIN(),
809 .bank_max[2] = ZYNQ_GPIO_BANK2_PIN_MAX(),
810 .bank_min[3] = ZYNQ_GPIO_BANK3_PIN_MIN(),
811 .bank_max[3] = ZYNQ_GPIO_BANK3_PIN_MAX(),
812};
813
814static const struct of_device_id zynq_gpio_of_match[] = {
815 { .compatible = "xlnx,zynq-gpio-1.0", .data = &zynq_gpio_def },
816 { .compatible = "xlnx,zynqmp-gpio-1.0", .data = &zynqmp_gpio_def },
817 { /* end of table */ }
818};
819MODULE_DEVICE_TABLE(of, zynq_gpio_of_match);
820
821/**
822 * zynq_gpio_probe - Initialization method for a zynq_gpio device
823 * @pdev: platform device instance
824 *
825 * This function allocates memory resources for the gpio device and registers
826 * all the banks of the device. It will also set up interrupts for the gpio
827 * pins.
828 * Note: Interrupts are disabled for all the banks during initialization.
829 *
830 * Return: 0 on success, negative error otherwise.
831 */
832static int zynq_gpio_probe(struct platform_device *pdev)
833{
834 int ret, bank_num;
835 struct zynq_gpio *gpio;
836 struct gpio_chip *chip;
837 struct resource *res;
838 const struct of_device_id *match;
839
840 gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
841 if (!gpio)
842 return -ENOMEM;
843
844 match = of_match_node(zynq_gpio_of_match, pdev->dev.of_node);
845 if (!match) {
846 dev_err(&pdev->dev, "of_match_node() failed\n");
847 return -EINVAL;
848 }
849 gpio->p_data = match->data;
850 platform_set_drvdata(pdev, gpio);
851
852 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
853 gpio->base_addr = devm_ioremap_resource(&pdev->dev, res);
854 if (IS_ERR(gpio->base_addr))
855 return PTR_ERR(gpio->base_addr);
856
857 gpio->irq = platform_get_irq(pdev, 0);
858 if (gpio->irq < 0) {
859 dev_err(&pdev->dev, "invalid IRQ\n");
860 return gpio->irq;
861 }
862
863 /* configure the gpio chip */
864 chip = &gpio->chip;
865 chip->label = gpio->p_data->label;
866 chip->owner = THIS_MODULE;
867 chip->parent = &pdev->dev;
868 chip->get = zynq_gpio_get_value;
869 chip->set = zynq_gpio_set_value;
870 chip->request = zynq_gpio_request;
871 chip->free = zynq_gpio_free;
872 chip->direction_input = zynq_gpio_dir_in;
873 chip->direction_output = zynq_gpio_dir_out;
874 chip->get_direction = zynq_gpio_get_direction;
875 chip->base = of_alias_get_id(pdev->dev.of_node, "gpio");
876 chip->ngpio = gpio->p_data->ngpio;
877
878 /* Retrieve GPIO clock */
879 gpio->clk = devm_clk_get(&pdev->dev, NULL);
880 if (IS_ERR(gpio->clk)) {
881 dev_err(&pdev->dev, "input clock not found.\n");
882 return PTR_ERR(gpio->clk);
883 }
884 ret = clk_prepare_enable(gpio->clk);
885 if (ret) {
886 dev_err(&pdev->dev, "Unable to enable clock.\n");
887 return ret;
888 }
889
890 pm_runtime_set_active(&pdev->dev);
891 pm_runtime_enable(&pdev->dev);
892 ret = pm_runtime_get_sync(&pdev->dev);
893 if (ret < 0)
894 goto err_pm_dis;
895
896 /* report a bug if gpio chip registration fails */
897 ret = gpiochip_add_data(chip, gpio);
898 if (ret) {
899 dev_err(&pdev->dev, "Failed to add gpio chip\n");
900 goto err_pm_put;
901 }
902
903 /* disable interrupts for all banks */
904 for (bank_num = 0; bank_num < gpio->p_data->max_bank; bank_num++)
905 writel_relaxed(ZYNQ_GPIO_IXR_DISABLE_ALL, gpio->base_addr +
906 ZYNQ_GPIO_INTDIS_OFFSET(bank_num));
907
908 ret = gpiochip_irqchip_add(chip, &zynq_gpio_edge_irqchip, 0,
909 handle_level_irq, IRQ_TYPE_NONE);
910 if (ret) {
911 dev_err(&pdev->dev, "Failed to add irq chip\n");
912 goto err_rm_gpiochip;
913 }
914
915 gpiochip_set_chained_irqchip(chip, &zynq_gpio_edge_irqchip, gpio->irq,
916 zynq_gpio_irqhandler);
917
918 pm_runtime_put(&pdev->dev);
919
920 return 0;
921
922err_rm_gpiochip:
923 gpiochip_remove(chip);
924err_pm_put:
925 pm_runtime_put(&pdev->dev);
926err_pm_dis:
927 pm_runtime_disable(&pdev->dev);
928 clk_disable_unprepare(gpio->clk);
929
930 return ret;
931}
932
933/**
934 * zynq_gpio_remove - Driver removal function
935 * @pdev: platform device instance
936 *
937 * Return: 0 always
938 */
939static int zynq_gpio_remove(struct platform_device *pdev)
940{
941 struct zynq_gpio *gpio = platform_get_drvdata(pdev);
942
943 pm_runtime_get_sync(&pdev->dev);
944 gpiochip_remove(&gpio->chip);
945 clk_disable_unprepare(gpio->clk);
946 device_set_wakeup_capable(&pdev->dev, 0);
947 pm_runtime_disable(&pdev->dev);
948 return 0;
949}
950
951static struct platform_driver zynq_gpio_driver = {
952 .driver = {
953 .name = DRIVER_NAME,
954 .pm = &zynq_gpio_dev_pm_ops,
955 .of_match_table = zynq_gpio_of_match,
956 },
957 .probe = zynq_gpio_probe,
958 .remove = zynq_gpio_remove,
959};
960
961/**
962 * zynq_gpio_init - Initial driver registration call
963 *
964 * Return: value from platform_driver_register
965 */
966static int __init zynq_gpio_init(void)
967{
968 return platform_driver_register(&zynq_gpio_driver);
969}
970postcore_initcall(zynq_gpio_init);
971
972static void __exit zynq_gpio_exit(void)
973{
974 platform_driver_unregister(&zynq_gpio_driver);
975}
976module_exit(zynq_gpio_exit);
977
978MODULE_AUTHOR("Xilinx Inc.");
979MODULE_DESCRIPTION("Zynq GPIO driver");
980MODULE_LICENSE("GPL");
981

Warning: That file was not part of the compilation database. It may have many parsing errors.