1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Xilinx gpio driver for xps/axi_gpio IP.
4 *
5 * Copyright 2008 - 2013 Xilinx, Inc.
6 */
7
8#include <linux/bitmap.h>
9#include <linux/bitops.h>
10#include <linux/clk.h>
11#include <linux/errno.h>
12#include <linux/gpio/driver.h>
13#include <linux/init.h>
14#include <linux/interrupt.h>
15#include <linux/io.h>
16#include <linux/irq.h>
17#include <linux/module.h>
18#include <linux/of.h>
19#include <linux/platform_device.h>
20#include <linux/pm_runtime.h>
21#include <linux/slab.h>
22
23/* Register Offset Definitions */
24#define XGPIO_DATA_OFFSET (0x0) /* Data register */
25#define XGPIO_TRI_OFFSET (0x4) /* I/O direction register */
26
27#define XGPIO_CHANNEL0_OFFSET 0x0
28#define XGPIO_CHANNEL1_OFFSET 0x8
29
30#define XGPIO_GIER_OFFSET 0x11c /* Global Interrupt Enable */
31#define XGPIO_GIER_IE BIT(31)
32#define XGPIO_IPISR_OFFSET 0x120 /* IP Interrupt Status */
33#define XGPIO_IPIER_OFFSET 0x128 /* IP Interrupt Enable */
34
35/* Read/Write access to the GPIO registers */
36#if defined(CONFIG_ARCH_ZYNQ) || defined(CONFIG_X86)
37# define xgpio_readreg(offset) readl(offset)
38# define xgpio_writereg(offset, val) writel(val, offset)
39#else
40# define xgpio_readreg(offset) __raw_readl(offset)
41# define xgpio_writereg(offset, val) __raw_writel(val, offset)
42#endif
43
44/**
45 * struct xgpio_instance - Stores information about GPIO device
46 * @gc: GPIO chip
47 * @regs: register block
48 * @hw_map: GPIO pin mapping on hardware side
49 * @sw_map: GPIO pin mapping on software side
50 * @state: GPIO write state shadow register
51 * @last_irq_read: GPIO read state register from last interrupt
52 * @dir: GPIO direction shadow register
53 * @gpio_lock: Lock used for synchronization
54 * @irq: IRQ used by GPIO device
55 * @enable: GPIO IRQ enable/disable bitfield
56 * @rising_edge: GPIO IRQ rising edge enable/disable bitfield
57 * @falling_edge: GPIO IRQ falling edge enable/disable bitfield
58 * @clk: clock resource for this driver
59 */
60struct xgpio_instance {
61 struct gpio_chip gc;
62 void __iomem *regs;
63 DECLARE_BITMAP(hw_map, 64);
64 DECLARE_BITMAP(sw_map, 64);
65 DECLARE_BITMAP(state, 64);
66 DECLARE_BITMAP(last_irq_read, 64);
67 DECLARE_BITMAP(dir, 64);
68 spinlock_t gpio_lock; /* For serializing operations */
69 int irq;
70 DECLARE_BITMAP(enable, 64);
71 DECLARE_BITMAP(rising_edge, 64);
72 DECLARE_BITMAP(falling_edge, 64);
73 struct clk *clk;
74};
75
76static inline int xgpio_from_bit(struct xgpio_instance *chip, int bit)
77{
78 return bitmap_bitremap(oldbit: bit, old: chip->hw_map, new: chip->sw_map, bits: 64);
79}
80
81static inline int xgpio_to_bit(struct xgpio_instance *chip, int gpio)
82{
83 return bitmap_bitremap(oldbit: gpio, old: chip->sw_map, new: chip->hw_map, bits: 64);
84}
85
86static inline u32 xgpio_get_value32(const unsigned long *map, int bit)
87{
88 const size_t index = BIT_WORD(bit);
89 const unsigned long offset = (bit % BITS_PER_LONG) & BIT(5);
90
91 return (map[index] >> offset) & 0xFFFFFFFFul;
92}
93
94static inline void xgpio_set_value32(unsigned long *map, int bit, u32 v)
95{
96 const size_t index = BIT_WORD(bit);
97 const unsigned long offset = (bit % BITS_PER_LONG) & BIT(5);
98
99 map[index] &= ~(0xFFFFFFFFul << offset);
100 map[index] |= (unsigned long)v << offset;
101}
102
103static inline int xgpio_regoffset(struct xgpio_instance *chip, int ch)
104{
105 switch (ch) {
106 case 0:
107 return XGPIO_CHANNEL0_OFFSET;
108 case 1:
109 return XGPIO_CHANNEL1_OFFSET;
110 default:
111 return -EINVAL;
112 }
113}
114
115static void xgpio_read_ch(struct xgpio_instance *chip, int reg, int bit, unsigned long *a)
116{
117 void __iomem *addr = chip->regs + reg + xgpio_regoffset(chip, ch: bit / 32);
118
119 xgpio_set_value32(map: a, bit, xgpio_readreg(addr));
120}
121
122static void xgpio_write_ch(struct xgpio_instance *chip, int reg, int bit, unsigned long *a)
123{
124 void __iomem *addr = chip->regs + reg + xgpio_regoffset(chip, ch: bit / 32);
125
126 xgpio_writereg(addr, xgpio_get_value32(a, bit));
127}
128
129static void xgpio_read_ch_all(struct xgpio_instance *chip, int reg, unsigned long *a)
130{
131 int bit, lastbit = xgpio_to_bit(chip, gpio: chip->gc.ngpio - 1);
132
133 for (bit = 0; bit <= lastbit ; bit += 32)
134 xgpio_read_ch(chip, reg, bit, a);
135}
136
137static void xgpio_write_ch_all(struct xgpio_instance *chip, int reg, unsigned long *a)
138{
139 int bit, lastbit = xgpio_to_bit(chip, gpio: chip->gc.ngpio - 1);
140
141 for (bit = 0; bit <= lastbit ; bit += 32)
142 xgpio_write_ch(chip, reg, bit, a);
143}
144
145/**
146 * xgpio_get - Read the specified signal of the GPIO device.
147 * @gc: Pointer to gpio_chip device structure.
148 * @gpio: GPIO signal number.
149 *
150 * This function reads the specified signal of the GPIO device.
151 *
152 * Return:
153 * 0 if direction of GPIO signals is set as input otherwise it
154 * returns negative error value.
155 */
156static int xgpio_get(struct gpio_chip *gc, unsigned int gpio)
157{
158 struct xgpio_instance *chip = gpiochip_get_data(gc);
159 int bit = xgpio_to_bit(chip, gpio);
160 DECLARE_BITMAP(state, 64);
161
162 xgpio_read_ch(chip, XGPIO_DATA_OFFSET, bit, a: state);
163
164 return test_bit(bit, state);
165}
166
167/**
168 * xgpio_set - Write the specified signal of the GPIO device.
169 * @gc: Pointer to gpio_chip device structure.
170 * @gpio: GPIO signal number.
171 * @val: Value to be written to specified signal.
172 *
173 * This function writes the specified value in to the specified signal of the
174 * GPIO device.
175 */
176static void xgpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
177{
178 unsigned long flags;
179 struct xgpio_instance *chip = gpiochip_get_data(gc);
180 int bit = xgpio_to_bit(chip, gpio);
181
182 spin_lock_irqsave(&chip->gpio_lock, flags);
183
184 /* Write to GPIO signal and set its direction to output */
185 __assign_bit(nr: bit, addr: chip->state, value: val);
186
187 xgpio_write_ch(chip, XGPIO_DATA_OFFSET, bit, a: chip->state);
188
189 spin_unlock_irqrestore(lock: &chip->gpio_lock, flags);
190}
191
192/**
193 * xgpio_set_multiple - Write the specified signals of the GPIO device.
194 * @gc: Pointer to gpio_chip device structure.
195 * @mask: Mask of the GPIOS to modify.
196 * @bits: Value to be wrote on each GPIO
197 *
198 * This function writes the specified values into the specified signals of the
199 * GPIO devices.
200 */
201static void xgpio_set_multiple(struct gpio_chip *gc, unsigned long *mask,
202 unsigned long *bits)
203{
204 DECLARE_BITMAP(hw_mask, 64);
205 DECLARE_BITMAP(hw_bits, 64);
206 DECLARE_BITMAP(state, 64);
207 unsigned long flags;
208 struct xgpio_instance *chip = gpiochip_get_data(gc);
209
210 bitmap_remap(dst: hw_mask, src: mask, old: chip->sw_map, new: chip->hw_map, nbits: 64);
211 bitmap_remap(dst: hw_bits, src: bits, old: chip->sw_map, new: chip->hw_map, nbits: 64);
212
213 spin_lock_irqsave(&chip->gpio_lock, flags);
214
215 bitmap_replace(dst: state, old: chip->state, new: hw_bits, mask: hw_mask, nbits: 64);
216
217 xgpio_write_ch_all(chip, XGPIO_DATA_OFFSET, a: state);
218
219 bitmap_copy(dst: chip->state, src: state, nbits: 64);
220
221 spin_unlock_irqrestore(lock: &chip->gpio_lock, flags);
222}
223
224/**
225 * xgpio_dir_in - Set the direction of the specified GPIO signal as input.
226 * @gc: Pointer to gpio_chip device structure.
227 * @gpio: GPIO signal number.
228 *
229 * Return:
230 * 0 - if direction of GPIO signals is set as input
231 * otherwise it returns negative error value.
232 */
233static int xgpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
234{
235 unsigned long flags;
236 struct xgpio_instance *chip = gpiochip_get_data(gc);
237 int bit = xgpio_to_bit(chip, gpio);
238
239 spin_lock_irqsave(&chip->gpio_lock, flags);
240
241 /* Set the GPIO bit in shadow register and set direction as input */
242 __set_bit(bit, chip->dir);
243 xgpio_write_ch(chip, XGPIO_TRI_OFFSET, bit, a: chip->dir);
244
245 spin_unlock_irqrestore(lock: &chip->gpio_lock, flags);
246
247 return 0;
248}
249
250/**
251 * xgpio_dir_out - Set the direction of the specified GPIO signal as output.
252 * @gc: Pointer to gpio_chip device structure.
253 * @gpio: GPIO signal number.
254 * @val: Value to be written to specified signal.
255 *
256 * This function sets the direction of specified GPIO signal as output.
257 *
258 * Return:
259 * If all GPIO signals of GPIO chip is configured as input then it returns
260 * error otherwise it returns 0.
261 */
262static int xgpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
263{
264 unsigned long flags;
265 struct xgpio_instance *chip = gpiochip_get_data(gc);
266 int bit = xgpio_to_bit(chip, gpio);
267
268 spin_lock_irqsave(&chip->gpio_lock, flags);
269
270 /* Write state of GPIO signal */
271 __assign_bit(nr: bit, addr: chip->state, value: val);
272 xgpio_write_ch(chip, XGPIO_DATA_OFFSET, bit, a: chip->state);
273
274 /* Clear the GPIO bit in shadow register and set direction as output */
275 __clear_bit(bit, chip->dir);
276 xgpio_write_ch(chip, XGPIO_TRI_OFFSET, bit, a: chip->dir);
277
278 spin_unlock_irqrestore(lock: &chip->gpio_lock, flags);
279
280 return 0;
281}
282
283/**
284 * xgpio_save_regs - Set initial values of GPIO pins
285 * @chip: Pointer to GPIO instance
286 */
287static void xgpio_save_regs(struct xgpio_instance *chip)
288{
289 xgpio_write_ch_all(chip, XGPIO_DATA_OFFSET, a: chip->state);
290 xgpio_write_ch_all(chip, XGPIO_TRI_OFFSET, a: chip->dir);
291}
292
293static int xgpio_request(struct gpio_chip *chip, unsigned int offset)
294{
295 int ret;
296
297 ret = pm_runtime_get_sync(dev: chip->parent);
298 /*
299 * If the device is already active pm_runtime_get() will return 1 on
300 * success, but gpio_request still needs to return 0.
301 */
302 return ret < 0 ? ret : 0;
303}
304
305static void xgpio_free(struct gpio_chip *chip, unsigned int offset)
306{
307 pm_runtime_put(dev: chip->parent);
308}
309
310static int __maybe_unused xgpio_suspend(struct device *dev)
311{
312 struct xgpio_instance *gpio = dev_get_drvdata(dev);
313 struct irq_data *data = irq_get_irq_data(irq: gpio->irq);
314
315 if (!data) {
316 dev_dbg(dev, "IRQ not connected\n");
317 return pm_runtime_force_suspend(dev);
318 }
319
320 if (!irqd_is_wakeup_set(d: data))
321 return pm_runtime_force_suspend(dev);
322
323 return 0;
324}
325
326/**
327 * xgpio_remove - Remove method for the GPIO device.
328 * @pdev: pointer to the platform device
329 *
330 * This function remove gpiochips and frees all the allocated resources.
331 *
332 * Return: 0 always
333 */
334static void xgpio_remove(struct platform_device *pdev)
335{
336 struct xgpio_instance *gpio = platform_get_drvdata(pdev);
337
338 pm_runtime_get_sync(dev: &pdev->dev);
339 pm_runtime_put_noidle(dev: &pdev->dev);
340 pm_runtime_disable(dev: &pdev->dev);
341 clk_disable_unprepare(clk: gpio->clk);
342}
343
344/**
345 * xgpio_irq_ack - Acknowledge a child GPIO interrupt.
346 * @irq_data: per IRQ and chip data passed down to chip functions
347 * This currently does nothing, but irq_ack is unconditionally called by
348 * handle_edge_irq and therefore must be defined.
349 */
350static void xgpio_irq_ack(struct irq_data *irq_data)
351{
352}
353
354static int __maybe_unused xgpio_resume(struct device *dev)
355{
356 struct xgpio_instance *gpio = dev_get_drvdata(dev);
357 struct irq_data *data = irq_get_irq_data(irq: gpio->irq);
358
359 if (!data) {
360 dev_dbg(dev, "IRQ not connected\n");
361 return pm_runtime_force_resume(dev);
362 }
363
364 if (!irqd_is_wakeup_set(d: data))
365 return pm_runtime_force_resume(dev);
366
367 return 0;
368}
369
370static int __maybe_unused xgpio_runtime_suspend(struct device *dev)
371{
372 struct xgpio_instance *gpio = dev_get_drvdata(dev);
373
374 clk_disable(clk: gpio->clk);
375
376 return 0;
377}
378
379static int __maybe_unused xgpio_runtime_resume(struct device *dev)
380{
381 struct xgpio_instance *gpio = dev_get_drvdata(dev);
382
383 return clk_enable(clk: gpio->clk);
384}
385
386static const struct dev_pm_ops xgpio_dev_pm_ops = {
387 SET_SYSTEM_SLEEP_PM_OPS(xgpio_suspend, xgpio_resume)
388 SET_RUNTIME_PM_OPS(xgpio_runtime_suspend,
389 xgpio_runtime_resume, NULL)
390};
391
392/**
393 * xgpio_irq_mask - Write the specified signal of the GPIO device.
394 * @irq_data: per IRQ and chip data passed down to chip functions
395 */
396static void xgpio_irq_mask(struct irq_data *irq_data)
397{
398 unsigned long flags;
399 struct xgpio_instance *chip = irq_data_get_irq_chip_data(d: irq_data);
400 int irq_offset = irqd_to_hwirq(d: irq_data);
401 int bit = xgpio_to_bit(chip, gpio: irq_offset);
402 u32 mask = BIT(bit / 32), temp;
403
404 spin_lock_irqsave(&chip->gpio_lock, flags);
405
406 __clear_bit(bit, chip->enable);
407
408 if (xgpio_get_value32(map: chip->enable, bit) == 0) {
409 /* Disable per channel interrupt */
410 temp = xgpio_readreg(chip->regs + XGPIO_IPIER_OFFSET);
411 temp &= ~mask;
412 xgpio_writereg(chip->regs + XGPIO_IPIER_OFFSET, temp);
413 }
414 spin_unlock_irqrestore(lock: &chip->gpio_lock, flags);
415
416 gpiochip_disable_irq(gc: &chip->gc, offset: irq_offset);
417}
418
419/**
420 * xgpio_irq_unmask - Write the specified signal of the GPIO device.
421 * @irq_data: per IRQ and chip data passed down to chip functions
422 */
423static void xgpio_irq_unmask(struct irq_data *irq_data)
424{
425 unsigned long flags;
426 struct xgpio_instance *chip = irq_data_get_irq_chip_data(d: irq_data);
427 int irq_offset = irqd_to_hwirq(d: irq_data);
428 int bit = xgpio_to_bit(chip, gpio: irq_offset);
429 u32 old_enable = xgpio_get_value32(map: chip->enable, bit);
430 u32 mask = BIT(bit / 32), val;
431
432 gpiochip_enable_irq(gc: &chip->gc, offset: irq_offset);
433
434 spin_lock_irqsave(&chip->gpio_lock, flags);
435
436 __set_bit(bit, chip->enable);
437
438 if (old_enable == 0) {
439 /* Clear any existing per-channel interrupts */
440 val = xgpio_readreg(chip->regs + XGPIO_IPISR_OFFSET);
441 val &= mask;
442 xgpio_writereg(chip->regs + XGPIO_IPISR_OFFSET, val);
443
444 /* Update GPIO IRQ read data before enabling interrupt*/
445 xgpio_read_ch(chip, XGPIO_DATA_OFFSET, bit, a: chip->last_irq_read);
446
447 /* Enable per channel interrupt */
448 val = xgpio_readreg(chip->regs + XGPIO_IPIER_OFFSET);
449 val |= mask;
450 xgpio_writereg(chip->regs + XGPIO_IPIER_OFFSET, val);
451 }
452
453 spin_unlock_irqrestore(lock: &chip->gpio_lock, flags);
454}
455
456/**
457 * xgpio_set_irq_type - Write the specified signal of the GPIO device.
458 * @irq_data: Per IRQ and chip data passed down to chip functions
459 * @type: Interrupt type that is to be set for the gpio pin
460 *
461 * Return:
462 * 0 if interrupt type is supported otherwise -EINVAL
463 */
464static int xgpio_set_irq_type(struct irq_data *irq_data, unsigned int type)
465{
466 struct xgpio_instance *chip = irq_data_get_irq_chip_data(d: irq_data);
467 int irq_offset = irqd_to_hwirq(d: irq_data);
468 int bit = xgpio_to_bit(chip, gpio: irq_offset);
469
470 /*
471 * The Xilinx GPIO hardware provides a single interrupt status
472 * indication for any state change in a given GPIO channel (bank).
473 * Therefore, only rising edge or falling edge triggers are
474 * supported.
475 */
476 switch (type & IRQ_TYPE_SENSE_MASK) {
477 case IRQ_TYPE_EDGE_BOTH:
478 __set_bit(bit, chip->rising_edge);
479 __set_bit(bit, chip->falling_edge);
480 break;
481 case IRQ_TYPE_EDGE_RISING:
482 __set_bit(bit, chip->rising_edge);
483 __clear_bit(bit, chip->falling_edge);
484 break;
485 case IRQ_TYPE_EDGE_FALLING:
486 __clear_bit(bit, chip->rising_edge);
487 __set_bit(bit, chip->falling_edge);
488 break;
489 default:
490 return -EINVAL;
491 }
492
493 irq_set_handler_locked(data: irq_data, handler: handle_edge_irq);
494 return 0;
495}
496
497/**
498 * xgpio_irqhandler - Gpio interrupt service routine
499 * @desc: Pointer to interrupt description
500 */
501static void xgpio_irqhandler(struct irq_desc *desc)
502{
503 struct xgpio_instance *chip = irq_desc_get_handler_data(desc);
504 struct gpio_chip *gc = &chip->gc;
505 struct irq_chip *irqchip = irq_desc_get_chip(desc);
506 DECLARE_BITMAP(rising, 64);
507 DECLARE_BITMAP(falling, 64);
508 DECLARE_BITMAP(all, 64);
509 int irq_offset;
510 u32 status;
511 u32 bit;
512
513 status = xgpio_readreg(chip->regs + XGPIO_IPISR_OFFSET);
514 xgpio_writereg(chip->regs + XGPIO_IPISR_OFFSET, status);
515
516 chained_irq_enter(chip: irqchip, desc);
517
518 spin_lock(lock: &chip->gpio_lock);
519
520 xgpio_read_ch_all(chip, XGPIO_DATA_OFFSET, a: all);
521
522 bitmap_complement(dst: rising, src: chip->last_irq_read, nbits: 64);
523 bitmap_and(dst: rising, src1: rising, src2: all, nbits: 64);
524 bitmap_and(dst: rising, src1: rising, src2: chip->enable, nbits: 64);
525 bitmap_and(dst: rising, src1: rising, src2: chip->rising_edge, nbits: 64);
526
527 bitmap_complement(dst: falling, src: all, nbits: 64);
528 bitmap_and(dst: falling, src1: falling, src2: chip->last_irq_read, nbits: 64);
529 bitmap_and(dst: falling, src1: falling, src2: chip->enable, nbits: 64);
530 bitmap_and(dst: falling, src1: falling, src2: chip->falling_edge, nbits: 64);
531
532 bitmap_copy(dst: chip->last_irq_read, src: all, nbits: 64);
533 bitmap_or(dst: all, src1: rising, src2: falling, nbits: 64);
534
535 spin_unlock(lock: &chip->gpio_lock);
536
537 dev_dbg(gc->parent, "IRQ rising %*pb falling %*pb\n", 64, rising, 64, falling);
538
539 for_each_set_bit(bit, all, 64) {
540 irq_offset = xgpio_from_bit(chip, bit);
541 generic_handle_domain_irq(domain: gc->irq.domain, hwirq: irq_offset);
542 }
543
544 chained_irq_exit(chip: irqchip, desc);
545}
546
547static const struct irq_chip xgpio_irq_chip = {
548 .name = "gpio-xilinx",
549 .irq_ack = xgpio_irq_ack,
550 .irq_mask = xgpio_irq_mask,
551 .irq_unmask = xgpio_irq_unmask,
552 .irq_set_type = xgpio_set_irq_type,
553 .flags = IRQCHIP_IMMUTABLE,
554 GPIOCHIP_IRQ_RESOURCE_HELPERS,
555};
556
557/**
558 * xgpio_probe - Probe method for the GPIO device.
559 * @pdev: pointer to the platform device
560 *
561 * Return:
562 * It returns 0, if the driver is bound to the GPIO device, or
563 * a negative value if there is an error.
564 */
565static int xgpio_probe(struct platform_device *pdev)
566{
567 struct xgpio_instance *chip;
568 int status = 0;
569 struct device_node *np = pdev->dev.of_node;
570 u32 is_dual = 0;
571 u32 width[2];
572 u32 state[2];
573 u32 dir[2];
574 struct gpio_irq_chip *girq;
575 u32 temp;
576
577 chip = devm_kzalloc(dev: &pdev->dev, size: sizeof(*chip), GFP_KERNEL);
578 if (!chip)
579 return -ENOMEM;
580
581 platform_set_drvdata(pdev, data: chip);
582
583 /* First, check if the device is dual-channel */
584 of_property_read_u32(np, propname: "xlnx,is-dual", out_value: &is_dual);
585
586 /* Setup defaults */
587 memset32(s: width, v: 0, ARRAY_SIZE(width));
588 memset32(s: state, v: 0, ARRAY_SIZE(state));
589 memset32(s: dir, v: 0xFFFFFFFF, ARRAY_SIZE(dir));
590
591 /* Update GPIO state shadow register with default value */
592 of_property_read_u32(np, propname: "xlnx,dout-default", out_value: &state[0]);
593 of_property_read_u32(np, propname: "xlnx,dout-default-2", out_value: &state[1]);
594
595 bitmap_from_arr32(bitmap: chip->state, buf: state, nbits: 64);
596
597 /* Update GPIO direction shadow register with default value */
598 of_property_read_u32(np, propname: "xlnx,tri-default", out_value: &dir[0]);
599 of_property_read_u32(np, propname: "xlnx,tri-default-2", out_value: &dir[1]);
600
601 bitmap_from_arr32(bitmap: chip->dir, buf: dir, nbits: 64);
602
603 /*
604 * Check device node and parent device node for device width
605 * and assume default width of 32
606 */
607 if (of_property_read_u32(np, propname: "xlnx,gpio-width", out_value: &width[0]))
608 width[0] = 32;
609
610 if (width[0] > 32)
611 return -EINVAL;
612
613 if (is_dual && of_property_read_u32(np, propname: "xlnx,gpio2-width", out_value: &width[1]))
614 width[1] = 32;
615
616 if (width[1] > 32)
617 return -EINVAL;
618
619 /* Setup software pin mapping */
620 bitmap_set(map: chip->sw_map, start: 0, nbits: width[0] + width[1]);
621
622 /* Setup hardware pin mapping */
623 bitmap_set(map: chip->hw_map, start: 0, nbits: width[0]);
624 bitmap_set(map: chip->hw_map, start: 32, nbits: width[1]);
625
626 spin_lock_init(&chip->gpio_lock);
627
628 chip->gc.base = -1;
629 chip->gc.ngpio = bitmap_weight(src: chip->hw_map, nbits: 64);
630 chip->gc.parent = &pdev->dev;
631 chip->gc.direction_input = xgpio_dir_in;
632 chip->gc.direction_output = xgpio_dir_out;
633 chip->gc.get = xgpio_get;
634 chip->gc.set = xgpio_set;
635 chip->gc.request = xgpio_request;
636 chip->gc.free = xgpio_free;
637 chip->gc.set_multiple = xgpio_set_multiple;
638
639 chip->gc.label = dev_name(dev: &pdev->dev);
640
641 chip->regs = devm_platform_ioremap_resource(pdev, index: 0);
642 if (IS_ERR(ptr: chip->regs)) {
643 dev_err(&pdev->dev, "failed to ioremap memory resource\n");
644 return PTR_ERR(ptr: chip->regs);
645 }
646
647 chip->clk = devm_clk_get_optional(dev: &pdev->dev, NULL);
648 if (IS_ERR(ptr: chip->clk))
649 return dev_err_probe(dev: &pdev->dev, err: PTR_ERR(ptr: chip->clk), fmt: "input clock not found.\n");
650
651 status = clk_prepare_enable(clk: chip->clk);
652 if (status < 0) {
653 dev_err(&pdev->dev, "Failed to prepare clk\n");
654 return status;
655 }
656 pm_runtime_get_noresume(dev: &pdev->dev);
657 pm_runtime_set_active(dev: &pdev->dev);
658 pm_runtime_enable(dev: &pdev->dev);
659
660 xgpio_save_regs(chip);
661
662 chip->irq = platform_get_irq_optional(pdev, 0);
663 if (chip->irq <= 0)
664 goto skip_irq;
665
666 /* Disable per-channel interrupts */
667 xgpio_writereg(chip->regs + XGPIO_IPIER_OFFSET, 0);
668 /* Clear any existing per-channel interrupts */
669 temp = xgpio_readreg(chip->regs + XGPIO_IPISR_OFFSET);
670 xgpio_writereg(chip->regs + XGPIO_IPISR_OFFSET, temp);
671 /* Enable global interrupts */
672 xgpio_writereg(chip->regs + XGPIO_GIER_OFFSET, XGPIO_GIER_IE);
673
674 girq = &chip->gc.irq;
675 gpio_irq_chip_set_chip(girq, chip: &xgpio_irq_chip);
676 girq->parent_handler = xgpio_irqhandler;
677 girq->num_parents = 1;
678 girq->parents = devm_kcalloc(dev: &pdev->dev, n: 1,
679 size: sizeof(*girq->parents),
680 GFP_KERNEL);
681 if (!girq->parents) {
682 status = -ENOMEM;
683 goto err_pm_put;
684 }
685 girq->parents[0] = chip->irq;
686 girq->default_type = IRQ_TYPE_NONE;
687 girq->handler = handle_bad_irq;
688
689skip_irq:
690 status = devm_gpiochip_add_data(&pdev->dev, &chip->gc, chip);
691 if (status) {
692 dev_err(&pdev->dev, "failed to add GPIO chip\n");
693 goto err_pm_put;
694 }
695
696 pm_runtime_put(dev: &pdev->dev);
697 return 0;
698
699err_pm_put:
700 pm_runtime_disable(dev: &pdev->dev);
701 pm_runtime_put_noidle(dev: &pdev->dev);
702 clk_disable_unprepare(clk: chip->clk);
703 return status;
704}
705
706static const struct of_device_id xgpio_of_match[] = {
707 { .compatible = "xlnx,xps-gpio-1.00.a", },
708 { /* end of list */ },
709};
710
711MODULE_DEVICE_TABLE(of, xgpio_of_match);
712
713static struct platform_driver xgpio_plat_driver = {
714 .probe = xgpio_probe,
715 .remove_new = xgpio_remove,
716 .driver = {
717 .name = "gpio-xilinx",
718 .of_match_table = xgpio_of_match,
719 .pm = &xgpio_dev_pm_ops,
720 },
721};
722
723static int __init xgpio_init(void)
724{
725 return platform_driver_register(&xgpio_plat_driver);
726}
727
728subsys_initcall(xgpio_init);
729
730static void __exit xgpio_exit(void)
731{
732 platform_driver_unregister(&xgpio_plat_driver);
733}
734module_exit(xgpio_exit);
735
736MODULE_AUTHOR("Xilinx, Inc.");
737MODULE_DESCRIPTION("Xilinx GPIO driver");
738MODULE_LICENSE("GPL");
739

source code of linux/drivers/gpio/gpio-xilinx.c