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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Renesas R-Car GPIO Support
4 *
5 * Copyright (C) 2014 Renesas Electronics Corporation
6 * Copyright (C) 2013 Magnus Damm
7 */
8
9#include <linux/err.h>
10#include <linux/gpio/driver.h>
11#include <linux/init.h>
12#include <linux/interrupt.h>
13#include <linux/io.h>
14#include <linux/ioport.h>
15#include <linux/irq.h>
16#include <linux/module.h>
17#include <linux/of.h>
18#include <linux/of_device.h>
19#include <linux/pinctrl/consumer.h>
20#include <linux/platform_device.h>
21#include <linux/pm_runtime.h>
22#include <linux/spinlock.h>
23#include <linux/slab.h>
24
25struct gpio_rcar_bank_info {
26 u32 iointsel;
27 u32 inoutsel;
28 u32 outdt;
29 u32 posneg;
30 u32 edglevel;
31 u32 bothedge;
32 u32 intmsk;
33};
34
35struct gpio_rcar_info {
36 bool has_outdtsel;
37 bool has_both_edge_trigger;
38 bool has_always_in;
39 bool has_inen;
40};
41
42struct gpio_rcar_priv {
43 void __iomem *base;
44 spinlock_t lock;
45 struct device *dev;
46 struct gpio_chip gpio_chip;
47 unsigned int irq_parent;
48 atomic_t wakeup_path;
49 struct gpio_rcar_info info;
50 struct gpio_rcar_bank_info bank_info;
51};
52
53#define IOINTSEL 0x00 /* General IO/Interrupt Switching Register */
54#define INOUTSEL 0x04 /* General Input/Output Switching Register */
55#define OUTDT 0x08 /* General Output Register */
56#define INDT 0x0c /* General Input Register */
57#define INTDT 0x10 /* Interrupt Display Register */
58#define INTCLR 0x14 /* Interrupt Clear Register */
59#define INTMSK 0x18 /* Interrupt Mask Register */
60#define MSKCLR 0x1c /* Interrupt Mask Clear Register */
61#define POSNEG 0x20 /* Positive/Negative Logic Select Register */
62#define EDGLEVEL 0x24 /* Edge/level Select Register */
63#define FILONOFF 0x28 /* Chattering Prevention On/Off Register */
64#define OUTDTSEL 0x40 /* Output Data Select Register */
65#define BOTHEDGE 0x4c /* One Edge/Both Edge Select Register */
66#define INEN 0x50 /* General Input Enable Register */
67
68#define RCAR_MAX_GPIO_PER_BANK 32
69
70static inline u32 gpio_rcar_read(struct gpio_rcar_priv *p, int offs)
71{
72 return ioread32(p->base + offs);
73}
74
75static inline void gpio_rcar_write(struct gpio_rcar_priv *p, int offs,
76 u32 value)
77{
78 iowrite32(value, p->base + offs);
79}
80
81static void gpio_rcar_modify_bit(struct gpio_rcar_priv *p, int offs,
82 int bit, bool value)
83{
84 u32 tmp = gpio_rcar_read(p, offs);
85
86 if (value)
87 tmp |= BIT(bit);
88 else
89 tmp &= ~BIT(bit);
90
91 gpio_rcar_write(p, offs, tmp);
92}
93
94static void gpio_rcar_irq_disable(struct irq_data *d)
95{
96 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
97 struct gpio_rcar_priv *p = gpiochip_get_data(gc);
98 irq_hw_number_t hwirq = irqd_to_hwirq(d);
99
100 gpio_rcar_write(p, INTMSK, ~BIT(hwirq));
101 gpiochip_disable_irq(gc, hwirq);
102}
103
104static void gpio_rcar_irq_enable(struct irq_data *d)
105{
106 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
107 struct gpio_rcar_priv *p = gpiochip_get_data(gc);
108 irq_hw_number_t hwirq = irqd_to_hwirq(d);
109
110 gpiochip_enable_irq(gc, hwirq);
111 gpio_rcar_write(p, MSKCLR, BIT(hwirq));
112}
113
114static void gpio_rcar_config_interrupt_input_mode(struct gpio_rcar_priv *p,
115 unsigned int hwirq,
116 bool active_high_rising_edge,
117 bool level_trigger,
118 bool both)
119{
120 unsigned long flags;
121
122 /* follow steps in the GPIO documentation for
123 * "Setting Edge-Sensitive Interrupt Input Mode" and
124 * "Setting Level-Sensitive Interrupt Input Mode"
125 */
126
127 spin_lock_irqsave(&p->lock, flags);
128
129 /* Configure positive or negative logic in POSNEG */
130 gpio_rcar_modify_bit(p, POSNEG, hwirq, !active_high_rising_edge);
131
132 /* Configure edge or level trigger in EDGLEVEL */
133 gpio_rcar_modify_bit(p, EDGLEVEL, hwirq, !level_trigger);
134
135 /* Select one edge or both edges in BOTHEDGE */
136 if (p->info.has_both_edge_trigger)
137 gpio_rcar_modify_bit(p, BOTHEDGE, hwirq, both);
138
139 /* Select "Interrupt Input Mode" in IOINTSEL */
140 gpio_rcar_modify_bit(p, IOINTSEL, hwirq, true);
141
142 /* Write INTCLR in case of edge trigger */
143 if (!level_trigger)
144 gpio_rcar_write(p, INTCLR, BIT(hwirq));
145
146 spin_unlock_irqrestore(&p->lock, flags);
147}
148
149static int gpio_rcar_irq_set_type(struct irq_data *d, unsigned int type)
150{
151 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
152 struct gpio_rcar_priv *p = gpiochip_get_data(gc);
153 unsigned int hwirq = irqd_to_hwirq(d);
154
155 dev_dbg(p->dev, "sense irq = %d, type = %d\n", hwirq, type);
156
157 switch (type & IRQ_TYPE_SENSE_MASK) {
158 case IRQ_TYPE_LEVEL_HIGH:
159 gpio_rcar_config_interrupt_input_mode(p, hwirq, true, true,
160 false);
161 break;
162 case IRQ_TYPE_LEVEL_LOW:
163 gpio_rcar_config_interrupt_input_mode(p, hwirq, false, true,
164 false);
165 break;
166 case IRQ_TYPE_EDGE_RISING:
167 gpio_rcar_config_interrupt_input_mode(p, hwirq, true, false,
168 false);
169 break;
170 case IRQ_TYPE_EDGE_FALLING:
171 gpio_rcar_config_interrupt_input_mode(p, hwirq, false, false,
172 false);
173 break;
174 case IRQ_TYPE_EDGE_BOTH:
175 if (!p->info.has_both_edge_trigger)
176 return -EINVAL;
177 gpio_rcar_config_interrupt_input_mode(p, hwirq, true, false,
178 true);
179 break;
180 default:
181 return -EINVAL;
182 }
183 return 0;
184}
185
186static int gpio_rcar_irq_set_wake(struct irq_data *d, unsigned int on)
187{
188 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
189 struct gpio_rcar_priv *p = gpiochip_get_data(gc);
190 int error;
191
192 if (p->irq_parent) {
193 error = irq_set_irq_wake(p->irq_parent, on);
194 if (error) {
195 dev_dbg(p->dev, "irq %u doesn't support irq_set_wake\n",
196 p->irq_parent);
197 p->irq_parent = 0;
198 }
199 }
200
201 if (on)
202 atomic_inc(&p->wakeup_path);
203 else
204 atomic_dec(&p->wakeup_path);
205
206 return 0;
207}
208
209static const struct irq_chip gpio_rcar_irq_chip = {
210 .name = "gpio-rcar",
211 .irq_mask = gpio_rcar_irq_disable,
212 .irq_unmask = gpio_rcar_irq_enable,
213 .irq_set_type = gpio_rcar_irq_set_type,
214 .irq_set_wake = gpio_rcar_irq_set_wake,
215 .flags = IRQCHIP_IMMUTABLE | IRQCHIP_SET_TYPE_MASKED |
216 IRQCHIP_MASK_ON_SUSPEND,
217 GPIOCHIP_IRQ_RESOURCE_HELPERS,
218};
219
220static irqreturn_t gpio_rcar_irq_handler(int irq, void *dev_id)
221{
222 struct gpio_rcar_priv *p = dev_id;
223 u32 pending;
224 unsigned int offset, irqs_handled = 0;
225
226 while ((pending = gpio_rcar_read(p, INTDT) &
227 gpio_rcar_read(p, INTMSK))) {
228 offset = __ffs(pending);
229 gpio_rcar_write(p, INTCLR, BIT(offset));
230 generic_handle_domain_irq(p->gpio_chip.irq.domain,
231 offset);
232 irqs_handled++;
233 }
234
235 return irqs_handled ? IRQ_HANDLED : IRQ_NONE;
236}
237
238static void gpio_rcar_config_general_input_output_mode(struct gpio_chip *chip,
239 unsigned int gpio,
240 bool output)
241{
242 struct gpio_rcar_priv *p = gpiochip_get_data(chip);
243 unsigned long flags;
244
245 /* follow steps in the GPIO documentation for
246 * "Setting General Output Mode" and
247 * "Setting General Input Mode"
248 */
249
250 spin_lock_irqsave(&p->lock, flags);
251
252 /* Configure positive logic in POSNEG */
253 gpio_rcar_modify_bit(p, POSNEG, gpio, false);
254
255 /* Select "General Input/Output Mode" in IOINTSEL */
256 gpio_rcar_modify_bit(p, IOINTSEL, gpio, false);
257
258 /* Select Input Mode or Output Mode in INOUTSEL */
259 gpio_rcar_modify_bit(p, INOUTSEL, gpio, output);
260
261 /* Select General Output Register to output data in OUTDTSEL */
262 if (p->info.has_outdtsel && output)
263 gpio_rcar_modify_bit(p, OUTDTSEL, gpio, false);
264
265 spin_unlock_irqrestore(&p->lock, flags);
266}
267
268static int gpio_rcar_request(struct gpio_chip *chip, unsigned offset)
269{
270 struct gpio_rcar_priv *p = gpiochip_get_data(chip);
271 int error;
272
273 error = pm_runtime_get_sync(p->dev);
274 if (error < 0) {
275 pm_runtime_put(p->dev);
276 return error;
277 }
278
279 error = pinctrl_gpio_request(chip->base + offset);
280 if (error)
281 pm_runtime_put(p->dev);
282
283 return error;
284}
285
286static void gpio_rcar_free(struct gpio_chip *chip, unsigned offset)
287{
288 struct gpio_rcar_priv *p = gpiochip_get_data(chip);
289
290 pinctrl_gpio_free(chip->base + offset);
291
292 /*
293 * Set the GPIO as an input to ensure that the next GPIO request won't
294 * drive the GPIO pin as an output.
295 */
296 gpio_rcar_config_general_input_output_mode(chip, offset, false);
297
298 pm_runtime_put(p->dev);
299}
300
301static int gpio_rcar_get_direction(struct gpio_chip *chip, unsigned int offset)
302{
303 struct gpio_rcar_priv *p = gpiochip_get_data(chip);
304
305 if (gpio_rcar_read(p, INOUTSEL) & BIT(offset))
306 return GPIO_LINE_DIRECTION_OUT;
307
308 return GPIO_LINE_DIRECTION_IN;
309}
310
311static int gpio_rcar_direction_input(struct gpio_chip *chip, unsigned offset)
312{
313 gpio_rcar_config_general_input_output_mode(chip, offset, false);
314 return 0;
315}
316
317static int gpio_rcar_get(struct gpio_chip *chip, unsigned offset)
318{
319 struct gpio_rcar_priv *p = gpiochip_get_data(chip);
320 u32 bit = BIT(offset);
321
322 /*
323 * Before R-Car Gen3, INDT does not show correct pin state when
324 * configured as output, so use OUTDT in case of output pins
325 */
326 if (!p->info.has_always_in && (gpio_rcar_read(p, INOUTSEL) & bit))
327 return !!(gpio_rcar_read(p, OUTDT) & bit);
328 else
329 return !!(gpio_rcar_read(p, INDT) & bit);
330}
331
332static int gpio_rcar_get_multiple(struct gpio_chip *chip, unsigned long *mask,
333 unsigned long *bits)
334{
335 struct gpio_rcar_priv *p = gpiochip_get_data(chip);
336 u32 bankmask, outputs, m, val = 0;
337 unsigned long flags;
338
339 bankmask = mask[0] & GENMASK(chip->ngpio - 1, 0);
340 if (chip->valid_mask)
341 bankmask &= chip->valid_mask[0];
342
343 if (!bankmask)
344 return 0;
345
346 if (p->info.has_always_in) {
347 bits[0] = gpio_rcar_read(p, INDT) & bankmask;
348 return 0;
349 }
350
351 spin_lock_irqsave(&p->lock, flags);
352 outputs = gpio_rcar_read(p, INOUTSEL);
353 m = outputs & bankmask;
354 if (m)
355 val |= gpio_rcar_read(p, OUTDT) & m;
356
357 m = ~outputs & bankmask;
358 if (m)
359 val |= gpio_rcar_read(p, INDT) & m;
360 spin_unlock_irqrestore(&p->lock, flags);
361
362 bits[0] = val;
363 return 0;
364}
365
366static void gpio_rcar_set(struct gpio_chip *chip, unsigned offset, int value)
367{
368 struct gpio_rcar_priv *p = gpiochip_get_data(chip);
369 unsigned long flags;
370
371 spin_lock_irqsave(&p->lock, flags);
372 gpio_rcar_modify_bit(p, OUTDT, offset, value);
373 spin_unlock_irqrestore(&p->lock, flags);
374}
375
376static void gpio_rcar_set_multiple(struct gpio_chip *chip, unsigned long *mask,
377 unsigned long *bits)
378{
379 struct gpio_rcar_priv *p = gpiochip_get_data(chip);
380 unsigned long flags;
381 u32 val, bankmask;
382
383 bankmask = mask[0] & GENMASK(chip->ngpio - 1, 0);
384 if (chip->valid_mask)
385 bankmask &= chip->valid_mask[0];
386
387 if (!bankmask)
388 return;
389
390 spin_lock_irqsave(&p->lock, flags);
391 val = gpio_rcar_read(p, OUTDT);
392 val &= ~bankmask;
393 val |= (bankmask & bits[0]);
394 gpio_rcar_write(p, OUTDT, val);
395 spin_unlock_irqrestore(&p->lock, flags);
396}
397
398static int gpio_rcar_direction_output(struct gpio_chip *chip, unsigned offset,
399 int value)
400{
401 /* write GPIO value to output before selecting output mode of pin */
402 gpio_rcar_set(chip, offset, value);
403 gpio_rcar_config_general_input_output_mode(chip, offset, true);
404 return 0;
405}
406
407static const struct gpio_rcar_info gpio_rcar_info_gen1 = {
408 .has_outdtsel = false,
409 .has_both_edge_trigger = false,
410 .has_always_in = false,
411 .has_inen = false,
412};
413
414static const struct gpio_rcar_info gpio_rcar_info_gen2 = {
415 .has_outdtsel = true,
416 .has_both_edge_trigger = true,
417 .has_always_in = false,
418 .has_inen = false,
419};
420
421static const struct gpio_rcar_info gpio_rcar_info_gen3 = {
422 .has_outdtsel = true,
423 .has_both_edge_trigger = true,
424 .has_always_in = true,
425 .has_inen = false,
426};
427
428static const struct gpio_rcar_info gpio_rcar_info_gen4 = {
429 .has_outdtsel = true,
430 .has_both_edge_trigger = true,
431 .has_always_in = true,
432 .has_inen = true,
433};
434
435static const struct of_device_id gpio_rcar_of_table[] = {
436 {
437 .compatible = "renesas,gpio-r8a779a0",
438 .data = &gpio_rcar_info_gen4,
439 }, {
440 .compatible = "renesas,rcar-gen1-gpio",
441 .data = &gpio_rcar_info_gen1,
442 }, {
443 .compatible = "renesas,rcar-gen2-gpio",
444 .data = &gpio_rcar_info_gen2,
445 }, {
446 .compatible = "renesas,rcar-gen3-gpio",
447 .data = &gpio_rcar_info_gen3,
448 }, {
449 .compatible = "renesas,rcar-gen4-gpio",
450 .data = &gpio_rcar_info_gen4,
451 }, {
452 .compatible = "renesas,gpio-rcar",
453 .data = &gpio_rcar_info_gen1,
454 }, {
455 /* Terminator */
456 },
457};
458
459MODULE_DEVICE_TABLE(of, gpio_rcar_of_table);
460
461static int gpio_rcar_parse_dt(struct gpio_rcar_priv *p, unsigned int *npins)
462{
463 struct device_node *np = p->dev->of_node;
464 const struct gpio_rcar_info *info;
465 struct of_phandle_args args;
466 int ret;
467
468 info = of_device_get_match_data(p->dev);
469 p->info = *info;
470
471 ret = of_parse_phandle_with_fixed_args(np, "gpio-ranges", 3, 0, &args);
472 *npins = ret == 0 ? args.args[2] : RCAR_MAX_GPIO_PER_BANK;
473
474 if (*npins == 0 || *npins > RCAR_MAX_GPIO_PER_BANK) {
475 dev_warn(p->dev, "Invalid number of gpio lines %u, using %u\n",
476 *npins, RCAR_MAX_GPIO_PER_BANK);
477 *npins = RCAR_MAX_GPIO_PER_BANK;
478 }
479
480 return 0;
481}
482
483static void gpio_rcar_enable_inputs(struct gpio_rcar_priv *p)
484{
485 u32 mask = GENMASK(p->gpio_chip.ngpio - 1, 0);
486
487 /* Select "Input Enable" in INEN */
488 if (p->gpio_chip.valid_mask)
489 mask &= p->gpio_chip.valid_mask[0];
490 if (mask)
491 gpio_rcar_write(p, INEN, gpio_rcar_read(p, INEN) | mask);
492}
493
494static int gpio_rcar_probe(struct platform_device *pdev)
495{
496 struct gpio_rcar_priv *p;
497 struct gpio_chip *gpio_chip;
498 struct gpio_irq_chip *girq;
499 struct device *dev = &pdev->dev;
500 const char *name = dev_name(dev);
501 unsigned int npins;
502 int ret;
503
504 p = devm_kzalloc(dev, sizeof(*p), GFP_KERNEL);
505 if (!p)
506 return -ENOMEM;
507
508 p->dev = dev;
509 spin_lock_init(&p->lock);
510
511 /* Get device configuration from DT node */
512 ret = gpio_rcar_parse_dt(p, &npins);
513 if (ret < 0)
514 return ret;
515
516 platform_set_drvdata(pdev, p);
517
518 pm_runtime_enable(dev);
519
520 ret = platform_get_irq(pdev, 0);
521 if (ret < 0)
522 goto err0;
523 p->irq_parent = ret;
524
525 p->base = devm_platform_ioremap_resource(pdev, 0);
526 if (IS_ERR(p->base)) {
527 ret = PTR_ERR(p->base);
528 goto err0;
529 }
530
531 gpio_chip = &p->gpio_chip;
532 gpio_chip->request = gpio_rcar_request;
533 gpio_chip->free = gpio_rcar_free;
534 gpio_chip->get_direction = gpio_rcar_get_direction;
535 gpio_chip->direction_input = gpio_rcar_direction_input;
536 gpio_chip->get = gpio_rcar_get;
537 gpio_chip->get_multiple = gpio_rcar_get_multiple;
538 gpio_chip->direction_output = gpio_rcar_direction_output;
539 gpio_chip->set = gpio_rcar_set;
540 gpio_chip->set_multiple = gpio_rcar_set_multiple;
541 gpio_chip->label = name;
542 gpio_chip->parent = dev;
543 gpio_chip->owner = THIS_MODULE;
544 gpio_chip->base = -1;
545 gpio_chip->ngpio = npins;
546
547 girq = &gpio_chip->irq;
548 gpio_irq_chip_set_chip(girq, &gpio_rcar_irq_chip);
549 /* This will let us handle the parent IRQ in the driver */
550 girq->parent_handler = NULL;
551 girq->num_parents = 0;
552 girq->parents = NULL;
553 girq->default_type = IRQ_TYPE_NONE;
554 girq->handler = handle_level_irq;
555
556 ret = gpiochip_add_data(gpio_chip, p);
557 if (ret) {
558 dev_err(dev, "failed to add GPIO controller\n");
559 goto err0;
560 }
561
562 irq_domain_set_pm_device(gpio_chip->irq.domain, dev);
563 ret = devm_request_irq(dev, p->irq_parent, gpio_rcar_irq_handler,
564 IRQF_SHARED, name, p);
565 if (ret) {
566 dev_err(dev, "failed to request IRQ\n");
567 goto err1;
568 }
569
570 if (p->info.has_inen) {
571 pm_runtime_get_sync(dev);
572 gpio_rcar_enable_inputs(p);
573 pm_runtime_put(dev);
574 }
575
576 dev_info(dev, "driving %d GPIOs\n", npins);
577
578 return 0;
579
580err1:
581 gpiochip_remove(gpio_chip);
582err0:
583 pm_runtime_disable(dev);
584 return ret;
585}
586
587static int gpio_rcar_remove(struct platform_device *pdev)
588{
589 struct gpio_rcar_priv *p = platform_get_drvdata(pdev);
590
591 gpiochip_remove(&p->gpio_chip);
592
593 pm_runtime_disable(&pdev->dev);
594 return 0;
595}
596
597#ifdef CONFIG_PM_SLEEP
598static int gpio_rcar_suspend(struct device *dev)
599{
600 struct gpio_rcar_priv *p = dev_get_drvdata(dev);
601
602 p->bank_info.iointsel = gpio_rcar_read(p, IOINTSEL);
603 p->bank_info.inoutsel = gpio_rcar_read(p, INOUTSEL);
604 p->bank_info.outdt = gpio_rcar_read(p, OUTDT);
605 p->bank_info.intmsk = gpio_rcar_read(p, INTMSK);
606 p->bank_info.posneg = gpio_rcar_read(p, POSNEG);
607 p->bank_info.edglevel = gpio_rcar_read(p, EDGLEVEL);
608 if (p->info.has_both_edge_trigger)
609 p->bank_info.bothedge = gpio_rcar_read(p, BOTHEDGE);
610
611 if (atomic_read(&p->wakeup_path))
612 device_set_wakeup_path(dev);
613
614 return 0;
615}
616
617static int gpio_rcar_resume(struct device *dev)
618{
619 struct gpio_rcar_priv *p = dev_get_drvdata(dev);
620 unsigned int offset;
621 u32 mask;
622
623 for (offset = 0; offset < p->gpio_chip.ngpio; offset++) {
624 if (!gpiochip_line_is_valid(&p->gpio_chip, offset))
625 continue;
626
627 mask = BIT(offset);
628 /* I/O pin */
629 if (!(p->bank_info.iointsel & mask)) {
630 if (p->bank_info.inoutsel & mask)
631 gpio_rcar_direction_output(
632 &p->gpio_chip, offset,
633 !!(p->bank_info.outdt & mask));
634 else
635 gpio_rcar_direction_input(&p->gpio_chip,
636 offset);
637 } else {
638 /* Interrupt pin */
639 gpio_rcar_config_interrupt_input_mode(
640 p,
641 offset,
642 !(p->bank_info.posneg & mask),
643 !(p->bank_info.edglevel & mask),
644 !!(p->bank_info.bothedge & mask));
645
646 if (p->bank_info.intmsk & mask)
647 gpio_rcar_write(p, MSKCLR, mask);
648 }
649 }
650
651 if (p->info.has_inen)
652 gpio_rcar_enable_inputs(p);
653
654 return 0;
655}
656#endif /* CONFIG_PM_SLEEP*/
657
658static SIMPLE_DEV_PM_OPS(gpio_rcar_pm_ops, gpio_rcar_suspend, gpio_rcar_resume);
659
660static struct platform_driver gpio_rcar_device_driver = {
661 .probe = gpio_rcar_probe,
662 .remove = gpio_rcar_remove,
663 .driver = {
664 .name = "gpio_rcar",
665 .pm = &gpio_rcar_pm_ops,
666 .of_match_table = of_match_ptr(gpio_rcar_of_table),
667 }
668};
669
670module_platform_driver(gpio_rcar_device_driver);
671
672MODULE_AUTHOR("Magnus Damm");
673MODULE_DESCRIPTION("Renesas R-Car GPIO Driver");
674MODULE_LICENSE("GPL v2");