blob: e72794e463aa3fd5f3adb6e05128a3f01126932b [file] [log] [blame]
Harini Katakam3242ba12014-07-08 16:32:35 +05301/*
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>
Anurag Kumar Vulishabdf7a4a2015-06-04 17:40:32 +053021#include <linux/of.h>
Harini Katakam3242ba12014-07-08 16:32:35 +053022
23#define DRIVER_NAME "zynq-gpio"
24
25/* Maximum banks */
26#define ZYNQ_GPIO_MAX_BANK 4
Anurag Kumar Vulishabdf7a4a2015-06-04 17:40:32 +053027#define ZYNQMP_GPIO_MAX_BANK 6
Harini Katakam3242ba12014-07-08 16:32:35 +053028
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
Anurag Kumar Vulishabdf7a4a2015-06-04 17:40:32 +053034#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
Harini Katakam3242ba12014-07-08 16:32:35 +053040
Anurag Kumar Vulishabdf7a4a2015-06-04 17:40:32 +053041#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)
Harini Katakam3242ba12014-07-08 16:32:35 +053062
63
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))
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/**
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
Ezra Savard59e22112014-08-29 10:58:46 -0700104 * @irq: interrupt for the GPIO device
Anurag Kumar Vulishabdf7a4a2015-06-04 17:40:32 +0530105 * @p_data: pointer to platform data
Harini Katakam3242ba12014-07-08 16:32:35 +0530106 */
107struct zynq_gpio {
108 struct gpio_chip chip;
109 void __iomem *base_addr;
110 struct clk *clk;
Ezra Savard59e22112014-08-29 10:58:46 -0700111 int irq;
Anurag Kumar Vulishabdf7a4a2015-06-04 17:40:32 +0530112 const struct zynq_platform_data *p_data;
113};
114
115/**
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
122*/
123struct zynq_platform_data {
124 const char *label;
125 u16 ngpio;
126 int max_bank;
127 int bank_min[ZYNQMP_GPIO_MAX_BANK];
128 int bank_max[ZYNQMP_GPIO_MAX_BANK];
Harini Katakam3242ba12014-07-08 16:32:35 +0530129};
130
Lars-Peter Clausen6dd85952014-07-18 11:52:13 +0200131static struct irq_chip zynq_gpio_level_irqchip;
132static struct irq_chip zynq_gpio_edge_irqchip;
Linus Walleijfa9795d2015-08-27 14:26:46 +0200133
Harini Katakam3242ba12014-07-08 16:32:35 +0530134/**
135 * zynq_gpio_get_bank_pin - Get the bank number and pin number within that bank
136 * for a given pin in the GPIO device
137 * @pin_num: gpio pin number within the device
138 * @bank_num: an output parameter used to return the bank number of the gpio
139 * pin
140 * @bank_pin_num: an output parameter used to return pin number within a bank
141 * for the given gpio pin
142 *
143 * Returns the bank number and pin offset within the bank.
144 */
145static inline void zynq_gpio_get_bank_pin(unsigned int pin_num,
146 unsigned int *bank_num,
Anurag Kumar Vulishabdf7a4a2015-06-04 17:40:32 +0530147 unsigned int *bank_pin_num,
148 struct zynq_gpio *gpio)
Harini Katakam3242ba12014-07-08 16:32:35 +0530149{
Anurag Kumar Vulishabdf7a4a2015-06-04 17:40:32 +0530150 int bank;
Harini Katakam3242ba12014-07-08 16:32:35 +0530151
Anurag Kumar Vulishabdf7a4a2015-06-04 17:40:32 +0530152 for (bank = 0; bank < gpio->p_data->max_bank; bank++) {
153 if ((pin_num >= gpio->p_data->bank_min[bank]) &&
154 (pin_num <= gpio->p_data->bank_max[bank])) {
155 *bank_num = bank;
156 *bank_pin_num = pin_num -
157 gpio->p_data->bank_min[bank];
158 return;
159 }
160 }
161
162 /* default */
163 WARN(true, "invalid GPIO pin number: %u", pin_num);
164 *bank_num = 0;
165 *bank_pin_num = 0;
166}
Lars-Peter Clausen016da142014-08-18 11:54:56 +0200167
Harini Katakam3242ba12014-07-08 16:32:35 +0530168/**
169 * zynq_gpio_get_value - Get the state of the specified pin of GPIO device
170 * @chip: gpio_chip instance to be worked on
171 * @pin: gpio pin number within the device
172 *
173 * This function reads the state of the specified pin of the GPIO device.
174 *
175 * Return: 0 if the pin is low, 1 if pin is high.
176 */
177static int zynq_gpio_get_value(struct gpio_chip *chip, unsigned int pin)
178{
179 u32 data;
180 unsigned int bank_num, bank_pin_num;
Linus Walleij31a89442015-12-07 15:29:53 +0100181 struct zynq_gpio *gpio = gpiochip_get_data(chip);
Harini Katakam3242ba12014-07-08 16:32:35 +0530182
Anurag Kumar Vulishabdf7a4a2015-06-04 17:40:32 +0530183 zynq_gpio_get_bank_pin(pin, &bank_num, &bank_pin_num, gpio);
Harini Katakam3242ba12014-07-08 16:32:35 +0530184
185 data = readl_relaxed(gpio->base_addr +
186 ZYNQ_GPIO_DATA_RO_OFFSET(bank_num));
187
188 return (data >> bank_pin_num) & 1;
189}
190
191/**
192 * zynq_gpio_set_value - Modify the state of the pin with specified value
193 * @chip: gpio_chip instance to be worked on
194 * @pin: gpio pin number within the device
195 * @state: value used to modify the state of the specified pin
196 *
197 * This function calculates the register offset (i.e to lower 16 bits or
198 * upper 16 bits) based on the given pin number and sets the state of a
199 * gpio pin to the specified value. The state is either 0 or non-zero.
200 */
201static void zynq_gpio_set_value(struct gpio_chip *chip, unsigned int pin,
202 int state)
203{
204 unsigned int reg_offset, bank_num, bank_pin_num;
Linus Walleij31a89442015-12-07 15:29:53 +0100205 struct zynq_gpio *gpio = gpiochip_get_data(chip);
Harini Katakam3242ba12014-07-08 16:32:35 +0530206
Anurag Kumar Vulishabdf7a4a2015-06-04 17:40:32 +0530207 zynq_gpio_get_bank_pin(pin, &bank_num, &bank_pin_num, gpio);
Harini Katakam3242ba12014-07-08 16:32:35 +0530208
209 if (bank_pin_num >= ZYNQ_GPIO_MID_PIN_NUM) {
210 /* only 16 data bits in bit maskable reg */
211 bank_pin_num -= ZYNQ_GPIO_MID_PIN_NUM;
212 reg_offset = ZYNQ_GPIO_DATA_MSW_OFFSET(bank_num);
213 } else {
214 reg_offset = ZYNQ_GPIO_DATA_LSW_OFFSET(bank_num);
215 }
216
217 /*
218 * get the 32 bit value to be written to the mask/data register where
219 * the upper 16 bits is the mask and lower 16 bits is the data
220 */
221 state = !!state;
222 state = ~(1 << (bank_pin_num + ZYNQ_GPIO_MID_PIN_NUM)) &
223 ((state << bank_pin_num) | ZYNQ_GPIO_UPPER_MASK);
224
225 writel_relaxed(state, gpio->base_addr + reg_offset);
226}
227
228/**
229 * zynq_gpio_dir_in - Set the direction of the specified GPIO pin as input
230 * @chip: gpio_chip instance to be worked on
231 * @pin: gpio pin number within the device
232 *
233 * This function uses the read-modify-write sequence to set the direction of
234 * the gpio pin as input.
235 *
236 * Return: 0 always
237 */
238static int zynq_gpio_dir_in(struct gpio_chip *chip, unsigned int pin)
239{
240 u32 reg;
241 unsigned int bank_num, bank_pin_num;
Linus Walleij31a89442015-12-07 15:29:53 +0100242 struct zynq_gpio *gpio = gpiochip_get_data(chip);
Harini Katakam3242ba12014-07-08 16:32:35 +0530243
Anurag Kumar Vulishabdf7a4a2015-06-04 17:40:32 +0530244 zynq_gpio_get_bank_pin(pin, &bank_num, &bank_pin_num, gpio);
Harini Katakam3242ba12014-07-08 16:32:35 +0530245
246 /* bank 0 pins 7 and 8 are special and cannot be used as inputs */
247 if (bank_num == 0 && (bank_pin_num == 7 || bank_pin_num == 8))
248 return -EINVAL;
249
250 /* clear the bit in direction mode reg to set the pin as input */
251 reg = readl_relaxed(gpio->base_addr + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
252 reg &= ~BIT(bank_pin_num);
253 writel_relaxed(reg, gpio->base_addr + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
254
255 return 0;
256}
257
258/**
259 * zynq_gpio_dir_out - Set the direction of the specified GPIO pin as output
260 * @chip: gpio_chip instance to be worked on
261 * @pin: gpio pin number within the device
262 * @state: value to be written to specified pin
263 *
264 * This function sets the direction of specified GPIO pin as output, configures
265 * the Output Enable register for the pin and uses zynq_gpio_set to set
266 * the state of the pin to the value specified.
267 *
268 * Return: 0 always
269 */
270static int zynq_gpio_dir_out(struct gpio_chip *chip, unsigned int pin,
271 int state)
272{
273 u32 reg;
274 unsigned int bank_num, bank_pin_num;
Linus Walleij31a89442015-12-07 15:29:53 +0100275 struct zynq_gpio *gpio = gpiochip_get_data(chip);
Harini Katakam3242ba12014-07-08 16:32:35 +0530276
Anurag Kumar Vulishabdf7a4a2015-06-04 17:40:32 +0530277 zynq_gpio_get_bank_pin(pin, &bank_num, &bank_pin_num, gpio);
Harini Katakam3242ba12014-07-08 16:32:35 +0530278
279 /* set the GPIO pin as output */
280 reg = readl_relaxed(gpio->base_addr + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
281 reg |= BIT(bank_pin_num);
282 writel_relaxed(reg, gpio->base_addr + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
283
284 /* configure the output enable reg for the pin */
285 reg = readl_relaxed(gpio->base_addr + ZYNQ_GPIO_OUTEN_OFFSET(bank_num));
286 reg |= BIT(bank_pin_num);
287 writel_relaxed(reg, gpio->base_addr + ZYNQ_GPIO_OUTEN_OFFSET(bank_num));
288
289 /* set the state of the pin */
290 zynq_gpio_set_value(chip, pin, state);
291 return 0;
292}
293
294/**
295 * zynq_gpio_irq_mask - Disable the interrupts for a gpio pin
296 * @irq_data: per irq and chip data passed down to chip functions
297 *
298 * This function calculates gpio pin number from irq number and sets the
299 * bit in the Interrupt Disable register of the corresponding bank to disable
300 * interrupts for that pin.
301 */
302static void zynq_gpio_irq_mask(struct irq_data *irq_data)
303{
304 unsigned int device_pin_num, bank_num, bank_pin_num;
Linus Walleijfa9795d2015-08-27 14:26:46 +0200305 struct zynq_gpio *gpio =
Linus Walleij31a89442015-12-07 15:29:53 +0100306 gpiochip_get_data(irq_data_get_irq_chip_data(irq_data));
Harini Katakam3242ba12014-07-08 16:32:35 +0530307
308 device_pin_num = irq_data->hwirq;
Anurag Kumar Vulishabdf7a4a2015-06-04 17:40:32 +0530309 zynq_gpio_get_bank_pin(device_pin_num, &bank_num, &bank_pin_num, gpio);
Harini Katakam3242ba12014-07-08 16:32:35 +0530310 writel_relaxed(BIT(bank_pin_num),
311 gpio->base_addr + ZYNQ_GPIO_INTDIS_OFFSET(bank_num));
312}
313
314/**
315 * zynq_gpio_irq_unmask - Enable the interrupts for a gpio pin
316 * @irq_data: irq data containing irq number of gpio pin for the interrupt
317 * to enable
318 *
319 * This function calculates the gpio pin number from irq number and sets the
320 * bit in the Interrupt Enable register of the corresponding bank to enable
321 * interrupts for that pin.
322 */
323static void zynq_gpio_irq_unmask(struct irq_data *irq_data)
324{
325 unsigned int device_pin_num, bank_num, bank_pin_num;
Linus Walleijfa9795d2015-08-27 14:26:46 +0200326 struct zynq_gpio *gpio =
Linus Walleij31a89442015-12-07 15:29:53 +0100327 gpiochip_get_data(irq_data_get_irq_chip_data(irq_data));
Harini Katakam3242ba12014-07-08 16:32:35 +0530328
329 device_pin_num = irq_data->hwirq;
Anurag Kumar Vulishabdf7a4a2015-06-04 17:40:32 +0530330 zynq_gpio_get_bank_pin(device_pin_num, &bank_num, &bank_pin_num, gpio);
Harini Katakam3242ba12014-07-08 16:32:35 +0530331 writel_relaxed(BIT(bank_pin_num),
332 gpio->base_addr + ZYNQ_GPIO_INTEN_OFFSET(bank_num));
333}
334
335/**
Lars-Peter Clausen190dc2e2014-07-18 11:52:12 +0200336 * zynq_gpio_irq_ack - Acknowledge the interrupt of a gpio pin
337 * @irq_data: irq data containing irq number of gpio pin for the interrupt
338 * to ack
339 *
340 * This function calculates gpio pin number from irq number and sets the bit
341 * in the Interrupt Status Register of the corresponding bank, to ACK the irq.
342 */
343static void zynq_gpio_irq_ack(struct irq_data *irq_data)
344{
345 unsigned int device_pin_num, bank_num, bank_pin_num;
Linus Walleijfa9795d2015-08-27 14:26:46 +0200346 struct zynq_gpio *gpio =
Linus Walleij31a89442015-12-07 15:29:53 +0100347 gpiochip_get_data(irq_data_get_irq_chip_data(irq_data));
Lars-Peter Clausen190dc2e2014-07-18 11:52:12 +0200348
349 device_pin_num = irq_data->hwirq;
Anurag Kumar Vulishabdf7a4a2015-06-04 17:40:32 +0530350 zynq_gpio_get_bank_pin(device_pin_num, &bank_num, &bank_pin_num, gpio);
Lars-Peter Clausen190dc2e2014-07-18 11:52:12 +0200351 writel_relaxed(BIT(bank_pin_num),
352 gpio->base_addr + ZYNQ_GPIO_INTSTS_OFFSET(bank_num));
353}
354
355/**
356 * zynq_gpio_irq_enable - Enable the interrupts for a gpio pin
357 * @irq_data: irq data containing irq number of gpio pin for the interrupt
358 * to enable
359 *
Colin Cronin20a8a962015-05-18 11:41:43 -0700360 * Clears the INTSTS bit and unmasks the given interrupt.
Lars-Peter Clausen190dc2e2014-07-18 11:52:12 +0200361 */
362static void zynq_gpio_irq_enable(struct irq_data *irq_data)
363{
364 /*
365 * The Zynq GPIO controller does not disable interrupt detection when
366 * the interrupt is masked and only disables the propagation of the
367 * interrupt. This means when the controller detects an interrupt
368 * condition while the interrupt is logically disabled it will propagate
369 * that interrupt event once the interrupt is enabled. This will cause
370 * the interrupt consumer to see spurious interrupts to prevent this
371 * first make sure that the interrupt is not asserted and then enable
372 * it.
373 */
374 zynq_gpio_irq_ack(irq_data);
375 zynq_gpio_irq_unmask(irq_data);
376}
377
378/**
Harini Katakam3242ba12014-07-08 16:32:35 +0530379 * zynq_gpio_set_irq_type - Set the irq type for a gpio pin
380 * @irq_data: irq data containing irq number of gpio pin
381 * @type: interrupt type that is to be set for the gpio pin
382 *
383 * This function gets the gpio pin number and its bank from the gpio pin number
384 * and configures the INT_TYPE, INT_POLARITY and INT_ANY registers.
385 *
386 * Return: 0, negative error otherwise.
387 * TYPE-EDGE_RISING, INT_TYPE - 1, INT_POLARITY - 1, INT_ANY - 0;
388 * TYPE-EDGE_FALLING, INT_TYPE - 1, INT_POLARITY - 0, INT_ANY - 0;
389 * TYPE-EDGE_BOTH, INT_TYPE - 1, INT_POLARITY - NA, INT_ANY - 1;
390 * TYPE-LEVEL_HIGH, INT_TYPE - 0, INT_POLARITY - 1, INT_ANY - NA;
391 * TYPE-LEVEL_LOW, INT_TYPE - 0, INT_POLARITY - 0, INT_ANY - NA
392 */
393static int zynq_gpio_set_irq_type(struct irq_data *irq_data, unsigned int type)
394{
395 u32 int_type, int_pol, int_any;
396 unsigned int device_pin_num, bank_num, bank_pin_num;
Linus Walleijfa9795d2015-08-27 14:26:46 +0200397 struct zynq_gpio *gpio =
Linus Walleij31a89442015-12-07 15:29:53 +0100398 gpiochip_get_data(irq_data_get_irq_chip_data(irq_data));
Harini Katakam3242ba12014-07-08 16:32:35 +0530399
400 device_pin_num = irq_data->hwirq;
Anurag Kumar Vulishabdf7a4a2015-06-04 17:40:32 +0530401 zynq_gpio_get_bank_pin(device_pin_num, &bank_num, &bank_pin_num, gpio);
Harini Katakam3242ba12014-07-08 16:32:35 +0530402
403 int_type = readl_relaxed(gpio->base_addr +
404 ZYNQ_GPIO_INTTYPE_OFFSET(bank_num));
405 int_pol = readl_relaxed(gpio->base_addr +
406 ZYNQ_GPIO_INTPOL_OFFSET(bank_num));
407 int_any = readl_relaxed(gpio->base_addr +
408 ZYNQ_GPIO_INTANY_OFFSET(bank_num));
409
410 /*
411 * based on the type requested, configure the INT_TYPE, INT_POLARITY
412 * and INT_ANY registers
413 */
414 switch (type) {
415 case IRQ_TYPE_EDGE_RISING:
416 int_type |= BIT(bank_pin_num);
417 int_pol |= BIT(bank_pin_num);
418 int_any &= ~BIT(bank_pin_num);
419 break;
420 case IRQ_TYPE_EDGE_FALLING:
421 int_type |= BIT(bank_pin_num);
422 int_pol &= ~BIT(bank_pin_num);
423 int_any &= ~BIT(bank_pin_num);
424 break;
425 case IRQ_TYPE_EDGE_BOTH:
426 int_type |= BIT(bank_pin_num);
427 int_any |= BIT(bank_pin_num);
428 break;
429 case IRQ_TYPE_LEVEL_HIGH:
430 int_type &= ~BIT(bank_pin_num);
431 int_pol |= BIT(bank_pin_num);
432 break;
433 case IRQ_TYPE_LEVEL_LOW:
434 int_type &= ~BIT(bank_pin_num);
435 int_pol &= ~BIT(bank_pin_num);
436 break;
437 default:
438 return -EINVAL;
439 }
440
441 writel_relaxed(int_type,
442 gpio->base_addr + ZYNQ_GPIO_INTTYPE_OFFSET(bank_num));
443 writel_relaxed(int_pol,
444 gpio->base_addr + ZYNQ_GPIO_INTPOL_OFFSET(bank_num));
445 writel_relaxed(int_any,
446 gpio->base_addr + ZYNQ_GPIO_INTANY_OFFSET(bank_num));
Lars-Peter Clausen6dd85952014-07-18 11:52:13 +0200447
448 if (type & IRQ_TYPE_LEVEL_MASK) {
Thomas Gleixner47c08462015-06-23 14:37:42 +0200449 irq_set_chip_handler_name_locked(irq_data,
Lars-Peter Clausen6dd85952014-07-18 11:52:13 +0200450 &zynq_gpio_level_irqchip, handle_fasteoi_irq, NULL);
451 } else {
Thomas Gleixner47c08462015-06-23 14:37:42 +0200452 irq_set_chip_handler_name_locked(irq_data,
Lars-Peter Clausen6dd85952014-07-18 11:52:13 +0200453 &zynq_gpio_edge_irqchip, handle_level_irq, NULL);
454 }
455
Harini Katakam3242ba12014-07-08 16:32:35 +0530456 return 0;
457}
458
459static int zynq_gpio_set_wake(struct irq_data *data, unsigned int on)
460{
Linus Walleijfa9795d2015-08-27 14:26:46 +0200461 struct zynq_gpio *gpio =
Linus Walleij31a89442015-12-07 15:29:53 +0100462 gpiochip_get_data(irq_data_get_irq_chip_data(data));
Ezra Savard59e22112014-08-29 10:58:46 -0700463
464 irq_set_irq_wake(gpio->irq, on);
Harini Katakam3242ba12014-07-08 16:32:35 +0530465
466 return 0;
467}
468
469/* irq chip descriptor */
Lars-Peter Clausen6dd85952014-07-18 11:52:13 +0200470static struct irq_chip zynq_gpio_level_irqchip = {
Harini Katakam3242ba12014-07-08 16:32:35 +0530471 .name = DRIVER_NAME,
Lars-Peter Clausen190dc2e2014-07-18 11:52:12 +0200472 .irq_enable = zynq_gpio_irq_enable,
Lars-Peter Clausen6dd85952014-07-18 11:52:13 +0200473 .irq_eoi = zynq_gpio_irq_ack,
474 .irq_mask = zynq_gpio_irq_mask,
475 .irq_unmask = zynq_gpio_irq_unmask,
476 .irq_set_type = zynq_gpio_set_irq_type,
477 .irq_set_wake = zynq_gpio_set_wake,
Ezra Savarda1946772014-08-29 10:58:45 -0700478 .flags = IRQCHIP_EOI_THREADED | IRQCHIP_EOI_IF_HANDLED |
479 IRQCHIP_MASK_ON_SUSPEND,
Lars-Peter Clausen6dd85952014-07-18 11:52:13 +0200480};
481
482static struct irq_chip zynq_gpio_edge_irqchip = {
483 .name = DRIVER_NAME,
484 .irq_enable = zynq_gpio_irq_enable,
485 .irq_ack = zynq_gpio_irq_ack,
Harini Katakam3242ba12014-07-08 16:32:35 +0530486 .irq_mask = zynq_gpio_irq_mask,
487 .irq_unmask = zynq_gpio_irq_unmask,
488 .irq_set_type = zynq_gpio_set_irq_type,
489 .irq_set_wake = zynq_gpio_set_wake,
Ezra Savarda1946772014-08-29 10:58:45 -0700490 .flags = IRQCHIP_MASK_ON_SUSPEND,
Harini Katakam3242ba12014-07-08 16:32:35 +0530491};
492
Lars-Peter Clausen5a2533a2014-08-18 11:54:55 +0200493static void zynq_gpio_handle_bank_irq(struct zynq_gpio *gpio,
494 unsigned int bank_num,
495 unsigned long pending)
496{
Anurag Kumar Vulishabdf7a4a2015-06-04 17:40:32 +0530497 unsigned int bank_offset = gpio->p_data->bank_min[bank_num];
Lars-Peter Clausen5a2533a2014-08-18 11:54:55 +0200498 struct irq_domain *irqdomain = gpio->chip.irqdomain;
499 int offset;
500
501 if (!pending)
502 return;
503
504 for_each_set_bit(offset, &pending, 32) {
505 unsigned int gpio_irq;
506
Lars-Peter Clausen016da142014-08-18 11:54:56 +0200507 gpio_irq = irq_find_mapping(irqdomain, offset + bank_offset);
Lars-Peter Clausen5a2533a2014-08-18 11:54:55 +0200508 generic_handle_irq(gpio_irq);
509 }
510}
511
Harini Katakam3242ba12014-07-08 16:32:35 +0530512/**
513 * zynq_gpio_irqhandler - IRQ handler for the gpio banks of a gpio device
514 * @irq: irq number of the gpio bank where interrupt has occurred
515 * @desc: irq descriptor instance of the 'irq'
516 *
517 * This function reads the Interrupt Status Register of each bank to get the
518 * gpio pin number which has triggered an interrupt. It then acks the triggered
519 * interrupt and calls the pin specific handler set by the higher layer
520 * application for that pin.
521 * Note: A bug is reported if no handler is set for the gpio pin.
522 */
Thomas Gleixnerbd0b9ac2015-09-14 10:42:37 +0200523static void zynq_gpio_irqhandler(struct irq_desc *desc)
Harini Katakam3242ba12014-07-08 16:32:35 +0530524{
525 u32 int_sts, int_enb;
526 unsigned int bank_num;
Linus Walleijfa9795d2015-08-27 14:26:46 +0200527 struct zynq_gpio *gpio =
Linus Walleij31a89442015-12-07 15:29:53 +0100528 gpiochip_get_data(irq_desc_get_handler_data(desc));
Harini Katakam3242ba12014-07-08 16:32:35 +0530529 struct irq_chip *irqchip = irq_desc_get_chip(desc);
530
531 chained_irq_enter(irqchip, desc);
532
Anurag Kumar Vulishabdf7a4a2015-06-04 17:40:32 +0530533 for (bank_num = 0; bank_num < gpio->p_data->max_bank; bank_num++) {
Harini Katakam3242ba12014-07-08 16:32:35 +0530534 int_sts = readl_relaxed(gpio->base_addr +
535 ZYNQ_GPIO_INTSTS_OFFSET(bank_num));
536 int_enb = readl_relaxed(gpio->base_addr +
537 ZYNQ_GPIO_INTMASK_OFFSET(bank_num));
Lars-Peter Clausen5a2533a2014-08-18 11:54:55 +0200538 zynq_gpio_handle_bank_irq(gpio, bank_num, int_sts & ~int_enb);
Harini Katakam3242ba12014-07-08 16:32:35 +0530539 }
540
541 chained_irq_exit(irqchip, desc);
542}
543
544static int __maybe_unused zynq_gpio_suspend(struct device *dev)
545{
Ezra Savard59e22112014-08-29 10:58:46 -0700546 struct platform_device *pdev = to_platform_device(dev);
547 int irq = platform_get_irq(pdev, 0);
548 struct irq_data *data = irq_get_irq_data(irq);
549
550 if (!irqd_is_wakeup_set(data))
Harini Katakam3242ba12014-07-08 16:32:35 +0530551 return pm_runtime_force_suspend(dev);
552
553 return 0;
554}
555
556static int __maybe_unused zynq_gpio_resume(struct device *dev)
557{
Ezra Savard59e22112014-08-29 10:58:46 -0700558 struct platform_device *pdev = to_platform_device(dev);
559 int irq = platform_get_irq(pdev, 0);
560 struct irq_data *data = irq_get_irq_data(irq);
561
562 if (!irqd_is_wakeup_set(data))
Harini Katakam3242ba12014-07-08 16:32:35 +0530563 return pm_runtime_force_resume(dev);
564
565 return 0;
566}
567
568static int __maybe_unused zynq_gpio_runtime_suspend(struct device *dev)
569{
570 struct platform_device *pdev = to_platform_device(dev);
571 struct zynq_gpio *gpio = platform_get_drvdata(pdev);
572
573 clk_disable_unprepare(gpio->clk);
574
575 return 0;
576}
577
578static int __maybe_unused zynq_gpio_runtime_resume(struct device *dev)
579{
580 struct platform_device *pdev = to_platform_device(dev);
581 struct zynq_gpio *gpio = platform_get_drvdata(pdev);
582
583 return clk_prepare_enable(gpio->clk);
584}
585
586static int zynq_gpio_request(struct gpio_chip *chip, unsigned offset)
587{
588 int ret;
589
Linus Walleij58383c72015-11-04 09:56:26 +0100590 ret = pm_runtime_get_sync(chip->parent);
Harini Katakam3242ba12014-07-08 16:32:35 +0530591
592 /*
593 * If the device is already active pm_runtime_get() will return 1 on
594 * success, but gpio_request still needs to return 0.
595 */
596 return ret < 0 ? ret : 0;
597}
598
599static void zynq_gpio_free(struct gpio_chip *chip, unsigned offset)
600{
Linus Walleij58383c72015-11-04 09:56:26 +0100601 pm_runtime_put(chip->parent);
Harini Katakam3242ba12014-07-08 16:32:35 +0530602}
603
604static const struct dev_pm_ops zynq_gpio_dev_pm_ops = {
605 SET_SYSTEM_SLEEP_PM_OPS(zynq_gpio_suspend, zynq_gpio_resume)
Rafael J. Wysocki6ed23b82014-12-04 00:34:11 +0100606 SET_RUNTIME_PM_OPS(zynq_gpio_runtime_suspend,
Harini Katakam3242ba12014-07-08 16:32:35 +0530607 zynq_gpio_runtime_resume, NULL)
608};
609
Anurag Kumar Vulishabdf7a4a2015-06-04 17:40:32 +0530610static const struct zynq_platform_data zynqmp_gpio_def = {
611 .label = "zynqmp_gpio",
612 .ngpio = ZYNQMP_GPIO_NR_GPIOS,
613 .max_bank = ZYNQMP_GPIO_MAX_BANK,
614 .bank_min[0] = ZYNQ_GPIO_BANK0_PIN_MIN(MP),
615 .bank_max[0] = ZYNQ_GPIO_BANK0_PIN_MAX(MP),
616 .bank_min[1] = ZYNQ_GPIO_BANK1_PIN_MIN(MP),
617 .bank_max[1] = ZYNQ_GPIO_BANK1_PIN_MAX(MP),
618 .bank_min[2] = ZYNQ_GPIO_BANK2_PIN_MIN(MP),
619 .bank_max[2] = ZYNQ_GPIO_BANK2_PIN_MAX(MP),
620 .bank_min[3] = ZYNQ_GPIO_BANK3_PIN_MIN(MP),
621 .bank_max[3] = ZYNQ_GPIO_BANK3_PIN_MAX(MP),
622 .bank_min[4] = ZYNQ_GPIO_BANK4_PIN_MIN(MP),
623 .bank_max[4] = ZYNQ_GPIO_BANK4_PIN_MAX(MP),
624 .bank_min[5] = ZYNQ_GPIO_BANK5_PIN_MIN(MP),
625 .bank_max[5] = ZYNQ_GPIO_BANK5_PIN_MAX(MP),
626};
627
628static const struct zynq_platform_data zynq_gpio_def = {
629 .label = "zynq_gpio",
630 .ngpio = ZYNQ_GPIO_NR_GPIOS,
631 .max_bank = ZYNQ_GPIO_MAX_BANK,
632 .bank_min[0] = ZYNQ_GPIO_BANK0_PIN_MIN(),
633 .bank_max[0] = ZYNQ_GPIO_BANK0_PIN_MAX(),
634 .bank_min[1] = ZYNQ_GPIO_BANK1_PIN_MIN(),
635 .bank_max[1] = ZYNQ_GPIO_BANK1_PIN_MAX(),
636 .bank_min[2] = ZYNQ_GPIO_BANK2_PIN_MIN(),
637 .bank_max[2] = ZYNQ_GPIO_BANK2_PIN_MAX(),
638 .bank_min[3] = ZYNQ_GPIO_BANK3_PIN_MIN(),
639 .bank_max[3] = ZYNQ_GPIO_BANK3_PIN_MAX(),
640};
641
642static const struct of_device_id zynq_gpio_of_match[] = {
643 { .compatible = "xlnx,zynq-gpio-1.0", .data = (void *)&zynq_gpio_def },
644 { .compatible = "xlnx,zynqmp-gpio-1.0",
645 .data = (void *)&zynqmp_gpio_def },
646 { /* end of table */ }
647};
648MODULE_DEVICE_TABLE(of, zynq_gpio_of_match);
649
Harini Katakam3242ba12014-07-08 16:32:35 +0530650/**
651 * zynq_gpio_probe - Initialization method for a zynq_gpio device
652 * @pdev: platform device instance
653 *
654 * This function allocates memory resources for the gpio device and registers
655 * all the banks of the device. It will also set up interrupts for the gpio
656 * pins.
657 * Note: Interrupts are disabled for all the banks during initialization.
658 *
659 * Return: 0 on success, negative error otherwise.
660 */
661static int zynq_gpio_probe(struct platform_device *pdev)
662{
Ezra Savard59e22112014-08-29 10:58:46 -0700663 int ret, bank_num;
Harini Katakam3242ba12014-07-08 16:32:35 +0530664 struct zynq_gpio *gpio;
665 struct gpio_chip *chip;
666 struct resource *res;
Anurag Kumar Vulishabdf7a4a2015-06-04 17:40:32 +0530667 const struct of_device_id *match;
Harini Katakam3242ba12014-07-08 16:32:35 +0530668
669 gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
670 if (!gpio)
671 return -ENOMEM;
672
Anurag Kumar Vulishabdf7a4a2015-06-04 17:40:32 +0530673 match = of_match_node(zynq_gpio_of_match, pdev->dev.of_node);
674 if (!match) {
675 dev_err(&pdev->dev, "of_match_node() failed\n");
676 return -EINVAL;
677 }
678 gpio->p_data = match->data;
Harini Katakam3242ba12014-07-08 16:32:35 +0530679 platform_set_drvdata(pdev, gpio);
680
681 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
682 gpio->base_addr = devm_ioremap_resource(&pdev->dev, res);
683 if (IS_ERR(gpio->base_addr))
684 return PTR_ERR(gpio->base_addr);
685
Ezra Savard59e22112014-08-29 10:58:46 -0700686 gpio->irq = platform_get_irq(pdev, 0);
687 if (gpio->irq < 0) {
Harini Katakam3242ba12014-07-08 16:32:35 +0530688 dev_err(&pdev->dev, "invalid IRQ\n");
Ezra Savard59e22112014-08-29 10:58:46 -0700689 return gpio->irq;
Harini Katakam3242ba12014-07-08 16:32:35 +0530690 }
691
692 /* configure the gpio chip */
693 chip = &gpio->chip;
Anurag Kumar Vulishabdf7a4a2015-06-04 17:40:32 +0530694 chip->label = gpio->p_data->label;
Harini Katakam3242ba12014-07-08 16:32:35 +0530695 chip->owner = THIS_MODULE;
Linus Walleij58383c72015-11-04 09:56:26 +0100696 chip->parent = &pdev->dev;
Harini Katakam3242ba12014-07-08 16:32:35 +0530697 chip->get = zynq_gpio_get_value;
698 chip->set = zynq_gpio_set_value;
699 chip->request = zynq_gpio_request;
700 chip->free = zynq_gpio_free;
701 chip->direction_input = zynq_gpio_dir_in;
702 chip->direction_output = zynq_gpio_dir_out;
703 chip->base = -1;
Anurag Kumar Vulishabdf7a4a2015-06-04 17:40:32 +0530704 chip->ngpio = gpio->p_data->ngpio;
Harini Katakam3242ba12014-07-08 16:32:35 +0530705
Michal Simek3773c192015-12-10 12:10:12 +0100706 /* Retrieve GPIO clock */
Harini Katakam3242ba12014-07-08 16:32:35 +0530707 gpio->clk = devm_clk_get(&pdev->dev, NULL);
708 if (IS_ERR(gpio->clk)) {
709 dev_err(&pdev->dev, "input clock not found.\n");
710 return PTR_ERR(gpio->clk);
711 }
Helmut Grohne0f84f292016-06-03 14:15:32 +0200712 ret = clk_prepare_enable(gpio->clk);
713 if (ret) {
714 dev_err(&pdev->dev, "Unable to enable clock.\n");
715 return ret;
716 }
Michal Simek3773c192015-12-10 12:10:12 +0100717
Helmut Grohne0f84f292016-06-03 14:15:32 +0200718 pm_runtime_set_active(&pdev->dev);
Michal Simek3773c192015-12-10 12:10:12 +0100719 pm_runtime_enable(&pdev->dev);
720 ret = pm_runtime_get_sync(&pdev->dev);
721 if (ret < 0)
Shubhrajyoti Datta615d23f2016-04-04 23:44:06 +0530722 goto err_pm_dis;
Harini Katakam3242ba12014-07-08 16:32:35 +0530723
724 /* report a bug if gpio chip registration fails */
Linus Walleij31a89442015-12-07 15:29:53 +0100725 ret = gpiochip_add_data(chip, gpio);
Harini Katakam3242ba12014-07-08 16:32:35 +0530726 if (ret) {
727 dev_err(&pdev->dev, "Failed to add gpio chip\n");
Michal Simek3773c192015-12-10 12:10:12 +0100728 goto err_pm_put;
Harini Katakam3242ba12014-07-08 16:32:35 +0530729 }
730
731 /* disable interrupts for all banks */
Anurag Kumar Vulishabdf7a4a2015-06-04 17:40:32 +0530732 for (bank_num = 0; bank_num < gpio->p_data->max_bank; bank_num++)
Harini Katakam3242ba12014-07-08 16:32:35 +0530733 writel_relaxed(ZYNQ_GPIO_IXR_DISABLE_ALL, gpio->base_addr +
734 ZYNQ_GPIO_INTDIS_OFFSET(bank_num));
735
Lars-Peter Clausen6dd85952014-07-18 11:52:13 +0200736 ret = gpiochip_irqchip_add(chip, &zynq_gpio_edge_irqchip, 0,
737 handle_level_irq, IRQ_TYPE_NONE);
Harini Katakam3242ba12014-07-08 16:32:35 +0530738 if (ret) {
739 dev_err(&pdev->dev, "Failed to add irq chip\n");
740 goto err_rm_gpiochip;
741 }
742
Ezra Savard59e22112014-08-29 10:58:46 -0700743 gpiochip_set_chained_irqchip(chip, &zynq_gpio_edge_irqchip, gpio->irq,
Harini Katakam3242ba12014-07-08 16:32:35 +0530744 zynq_gpio_irqhandler);
745
Michal Simek3773c192015-12-10 12:10:12 +0100746 pm_runtime_put(&pdev->dev);
Harini Katakam3242ba12014-07-08 16:32:35 +0530747
Harini Katakam3242ba12014-07-08 16:32:35 +0530748 return 0;
749
750err_rm_gpiochip:
abdoulaye berthe88d5e522014-07-12 22:30:14 +0200751 gpiochip_remove(chip);
Michal Simek3773c192015-12-10 12:10:12 +0100752err_pm_put:
753 pm_runtime_put(&pdev->dev);
Shubhrajyoti Datta615d23f2016-04-04 23:44:06 +0530754err_pm_dis:
755 pm_runtime_disable(&pdev->dev);
Helmut Grohne0f84f292016-06-03 14:15:32 +0200756 clk_disable_unprepare(gpio->clk);
Harini Katakam3242ba12014-07-08 16:32:35 +0530757
758 return ret;
759}
760
761/**
762 * zynq_gpio_remove - Driver removal function
763 * @pdev: platform device instance
764 *
765 * Return: 0 always
766 */
767static int zynq_gpio_remove(struct platform_device *pdev)
768{
Harini Katakam3242ba12014-07-08 16:32:35 +0530769 struct zynq_gpio *gpio = platform_get_drvdata(pdev);
770
771 pm_runtime_get_sync(&pdev->dev);
Linus Walleijda26d5d2014-09-16 15:11:41 -0700772 gpiochip_remove(&gpio->chip);
Harini Katakam3242ba12014-07-08 16:32:35 +0530773 clk_disable_unprepare(gpio->clk);
774 device_set_wakeup_capable(&pdev->dev, 0);
Michal Simek6b956af2015-06-25 10:29:19 +0200775 pm_runtime_disable(&pdev->dev);
Harini Katakam3242ba12014-07-08 16:32:35 +0530776 return 0;
777}
778
Harini Katakam3242ba12014-07-08 16:32:35 +0530779static struct platform_driver zynq_gpio_driver = {
780 .driver = {
781 .name = DRIVER_NAME,
Harini Katakam3242ba12014-07-08 16:32:35 +0530782 .pm = &zynq_gpio_dev_pm_ops,
783 .of_match_table = zynq_gpio_of_match,
784 },
785 .probe = zynq_gpio_probe,
786 .remove = zynq_gpio_remove,
787};
788
789/**
790 * zynq_gpio_init - Initial driver registration call
791 *
792 * Return: value from platform_driver_register
793 */
794static int __init zynq_gpio_init(void)
795{
796 return platform_driver_register(&zynq_gpio_driver);
797}
798postcore_initcall(zynq_gpio_init);
799
Masahiro Yamada80d2bf52015-06-17 17:51:41 +0900800static void __exit zynq_gpio_exit(void)
801{
802 platform_driver_unregister(&zynq_gpio_driver);
803}
804module_exit(zynq_gpio_exit);
805
Harini Katakam3242ba12014-07-08 16:32:35 +0530806MODULE_AUTHOR("Xilinx Inc.");
807MODULE_DESCRIPTION("Zynq GPIO driver");
808MODULE_LICENSE("GPL");