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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * arch/arm/mach-tegra/gpio.c
4 *
5 * Copyright (c) 2010 Google, Inc
6 * Copyright (c) 2011-2016, NVIDIA CORPORATION. All rights reserved.
7 *
8 * Author:
9 * Erik Gilling <konkers@google.com>
10 */
11
12#include <linux/err.h>
13#include <linux/init.h>
14#include <linux/irq.h>
15#include <linux/interrupt.h>
16#include <linux/io.h>
17#include <linux/gpio/driver.h>
18#include <linux/of.h>
19#include <linux/platform_device.h>
20#include <linux/module.h>
21#include <linux/irqdomain.h>
22#include <linux/irqchip/chained_irq.h>
23#include <linux/pinctrl/consumer.h>
24#include <linux/pm.h>
25#include <linux/property.h>
26#include <linux/seq_file.h>
27
28#define GPIO_BANK(x) ((x) >> 5)
29#define GPIO_PORT(x) (((x) >> 3) & 0x3)
30#define GPIO_BIT(x) ((x) & 0x7)
31
32#define GPIO_REG(tgi, x) (GPIO_BANK(x) * tgi->soc->bank_stride + \
33 GPIO_PORT(x) * 4)
34
35#define GPIO_CNF(t, x) (GPIO_REG(t, x) + 0x00)
36#define GPIO_OE(t, x) (GPIO_REG(t, x) + 0x10)
37#define GPIO_OUT(t, x) (GPIO_REG(t, x) + 0X20)
38#define GPIO_IN(t, x) (GPIO_REG(t, x) + 0x30)
39#define GPIO_INT_STA(t, x) (GPIO_REG(t, x) + 0x40)
40#define GPIO_INT_ENB(t, x) (GPIO_REG(t, x) + 0x50)
41#define GPIO_INT_LVL(t, x) (GPIO_REG(t, x) + 0x60)
42#define GPIO_INT_CLR(t, x) (GPIO_REG(t, x) + 0x70)
43#define GPIO_DBC_CNT(t, x) (GPIO_REG(t, x) + 0xF0)
44
45
46#define GPIO_MSK_CNF(t, x) (GPIO_REG(t, x) + t->soc->upper_offset + 0x00)
47#define GPIO_MSK_OE(t, x) (GPIO_REG(t, x) + t->soc->upper_offset + 0x10)
48#define GPIO_MSK_OUT(t, x) (GPIO_REG(t, x) + t->soc->upper_offset + 0X20)
49#define GPIO_MSK_DBC_EN(t, x) (GPIO_REG(t, x) + t->soc->upper_offset + 0x30)
50#define GPIO_MSK_INT_STA(t, x) (GPIO_REG(t, x) + t->soc->upper_offset + 0x40)
51#define GPIO_MSK_INT_ENB(t, x) (GPIO_REG(t, x) + t->soc->upper_offset + 0x50)
52#define GPIO_MSK_INT_LVL(t, x) (GPIO_REG(t, x) + t->soc->upper_offset + 0x60)
53
54#define GPIO_INT_LVL_MASK 0x010101
55#define GPIO_INT_LVL_EDGE_RISING 0x000101
56#define GPIO_INT_LVL_EDGE_FALLING 0x000100
57#define GPIO_INT_LVL_EDGE_BOTH 0x010100
58#define GPIO_INT_LVL_LEVEL_HIGH 0x000001
59#define GPIO_INT_LVL_LEVEL_LOW 0x000000
60
61struct tegra_gpio_info;
62
63struct tegra_gpio_bank {
64 unsigned int bank;
65
66 /*
67 * IRQ-core code uses raw locking, and thus, nested locking also
68 * should be raw in order not to trip spinlock debug warnings.
69 */
70 raw_spinlock_t lvl_lock[4];
71
72 /* Lock for updating debounce count register */
73 spinlock_t dbc_lock[4];
74
75#ifdef CONFIG_PM_SLEEP
76 u32 cnf[4];
77 u32 out[4];
78 u32 oe[4];
79 u32 int_enb[4];
80 u32 int_lvl[4];
81 u32 wake_enb[4];
82 u32 dbc_enb[4];
83#endif
84 u32 dbc_cnt[4];
85};
86
87struct tegra_gpio_soc_config {
88 bool debounce_supported;
89 u32 bank_stride;
90 u32 upper_offset;
91};
92
93struct tegra_gpio_info {
94 struct device *dev;
95 void __iomem *regs;
96 struct tegra_gpio_bank *bank_info;
97 const struct tegra_gpio_soc_config *soc;
98 struct gpio_chip gc;
99 u32 bank_count;
100 unsigned int *irqs;
101};
102
103static inline void tegra_gpio_writel(struct tegra_gpio_info *tgi,
104 u32 val, u32 reg)
105{
106 writel_relaxed(val, tgi->regs + reg);
107}
108
109static inline u32 tegra_gpio_readl(struct tegra_gpio_info *tgi, u32 reg)
110{
111 return readl_relaxed(tgi->regs + reg);
112}
113
114static unsigned int tegra_gpio_compose(unsigned int bank, unsigned int port,
115 unsigned int bit)
116{
117 return (bank << 5) | ((port & 0x3) << 3) | (bit & 0x7);
118}
119
120static void tegra_gpio_mask_write(struct tegra_gpio_info *tgi, u32 reg,
121 unsigned int gpio, u32 value)
122{
123 u32 val;
124
125 val = 0x100 << GPIO_BIT(gpio);
126 if (value)
127 val |= 1 << GPIO_BIT(gpio);
128 tegra_gpio_writel(tgi, val, reg);
129}
130
131static void tegra_gpio_enable(struct tegra_gpio_info *tgi, unsigned int gpio)
132{
133 tegra_gpio_mask_write(tgi, GPIO_MSK_CNF(tgi, gpio), gpio, 1);
134}
135
136static void tegra_gpio_disable(struct tegra_gpio_info *tgi, unsigned int gpio)
137{
138 tegra_gpio_mask_write(tgi, GPIO_MSK_CNF(tgi, gpio), gpio, 0);
139}
140
141static void tegra_gpio_free(struct gpio_chip *chip, unsigned int offset)
142{
143 struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
144
145 pinctrl_gpio_free(chip, offset);
146 tegra_gpio_disable(tgi, offset);
147}
148
149static void tegra_gpio_set(struct gpio_chip *chip, unsigned int offset,
150 int value)
151{
152 struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
153
154 tegra_gpio_mask_write(tgi, GPIO_MSK_OUT(tgi, offset), offset, value);
155}
156
157static int tegra_gpio_get(struct gpio_chip *chip, unsigned int offset)
158{
159 struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
160 unsigned int bval = BIT(GPIO_BIT(offset));
161
162 /* If gpio is in output mode then read from the out value */
163 if (tegra_gpio_readl(tgi, GPIO_OE(tgi, offset)) & bval)
164 return !!(tegra_gpio_readl(tgi, GPIO_OUT(tgi, offset)) & bval);
165
166 return !!(tegra_gpio_readl(tgi, GPIO_IN(tgi, offset)) & bval);
167}
168
169static int tegra_gpio_direction_input(struct gpio_chip *chip,
170 unsigned int offset)
171{
172 struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
173 int ret;
174
175 tegra_gpio_mask_write(tgi, GPIO_MSK_OE(tgi, offset), offset, 0);
176 tegra_gpio_enable(tgi, offset);
177
178 ret = pinctrl_gpio_direction_input(chip, offset);
179 if (ret < 0)
180 dev_err(tgi->dev,
181 "Failed to set pinctrl input direction of GPIO %d: %d",
182 chip->base + offset, ret);
183
184 return ret;
185}
186
187static int tegra_gpio_direction_output(struct gpio_chip *chip,
188 unsigned int offset,
189 int value)
190{
191 struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
192 int ret;
193
194 tegra_gpio_set(chip, offset, value);
195 tegra_gpio_mask_write(tgi, GPIO_MSK_OE(tgi, offset), offset, 1);
196 tegra_gpio_enable(tgi, offset);
197
198 ret = pinctrl_gpio_direction_output(chip, offset);
199 if (ret < 0)
200 dev_err(tgi->dev,
201 "Failed to set pinctrl output direction of GPIO %d: %d",
202 chip->base + offset, ret);
203
204 return ret;
205}
206
207static int tegra_gpio_get_direction(struct gpio_chip *chip,
208 unsigned int offset)
209{
210 struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
211 u32 pin_mask = BIT(GPIO_BIT(offset));
212 u32 cnf, oe;
213
214 cnf = tegra_gpio_readl(tgi, GPIO_CNF(tgi, offset));
215 if (!(cnf & pin_mask))
216 return -EINVAL;
217
218 oe = tegra_gpio_readl(tgi, GPIO_OE(tgi, offset));
219
220 if (oe & pin_mask)
221 return GPIO_LINE_DIRECTION_OUT;
222
223 return GPIO_LINE_DIRECTION_IN;
224}
225
226static int tegra_gpio_set_debounce(struct gpio_chip *chip, unsigned int offset,
227 unsigned int debounce)
228{
229 struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
230 struct tegra_gpio_bank *bank = &tgi->bank_info[GPIO_BANK(offset)];
231 unsigned int debounce_ms = DIV_ROUND_UP(debounce, 1000);
232 unsigned long flags;
233 unsigned int port;
234
235 if (!debounce_ms) {
236 tegra_gpio_mask_write(tgi, GPIO_MSK_DBC_EN(tgi, offset),
237 offset, 0);
238 return 0;
239 }
240
241 debounce_ms = min(debounce_ms, 255U);
242 port = GPIO_PORT(offset);
243
244 /* There is only one debounce count register per port and hence
245 * set the maximum of current and requested debounce time.
246 */
247 spin_lock_irqsave(&bank->dbc_lock[port], flags);
248 if (bank->dbc_cnt[port] < debounce_ms) {
249 tegra_gpio_writel(tgi, debounce_ms, GPIO_DBC_CNT(tgi, offset));
250 bank->dbc_cnt[port] = debounce_ms;
251 }
252 spin_unlock_irqrestore(&bank->dbc_lock[port], flags);
253
254 tegra_gpio_mask_write(tgi, GPIO_MSK_DBC_EN(tgi, offset), offset, 1);
255
256 return 0;
257}
258
259static int tegra_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
260 unsigned long config)
261{
262 u32 debounce;
263
264 if (pinconf_to_config_param(config) != PIN_CONFIG_INPUT_DEBOUNCE)
265 return -ENOTSUPP;
266
267 debounce = pinconf_to_config_argument(config);
268 return tegra_gpio_set_debounce(chip, offset, debounce);
269}
270
271static void tegra_gpio_irq_ack(struct irq_data *d)
272{
273 struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
274 struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
275 unsigned int gpio = d->hwirq;
276
277 tegra_gpio_writel(tgi, 1 << GPIO_BIT(gpio), GPIO_INT_CLR(tgi, gpio));
278}
279
280static void tegra_gpio_irq_mask(struct irq_data *d)
281{
282 struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
283 struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
284 unsigned int gpio = d->hwirq;
285
286 tegra_gpio_mask_write(tgi, GPIO_MSK_INT_ENB(tgi, gpio), gpio, 0);
287 gpiochip_disable_irq(chip, gpio);
288}
289
290static void tegra_gpio_irq_unmask(struct irq_data *d)
291{
292 struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
293 struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
294 unsigned int gpio = d->hwirq;
295
296 gpiochip_enable_irq(chip, gpio);
297 tegra_gpio_mask_write(tgi, GPIO_MSK_INT_ENB(tgi, gpio), gpio, 1);
298}
299
300static int tegra_gpio_irq_set_type(struct irq_data *d, unsigned int type)
301{
302 unsigned int gpio = d->hwirq, port = GPIO_PORT(gpio), lvl_type;
303 struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
304 struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
305 struct tegra_gpio_bank *bank;
306 unsigned long flags;
307 int ret;
308 u32 val;
309
310 bank = &tgi->bank_info[GPIO_BANK(d->hwirq)];
311
312 switch (type & IRQ_TYPE_SENSE_MASK) {
313 case IRQ_TYPE_EDGE_RISING:
314 lvl_type = GPIO_INT_LVL_EDGE_RISING;
315 break;
316
317 case IRQ_TYPE_EDGE_FALLING:
318 lvl_type = GPIO_INT_LVL_EDGE_FALLING;
319 break;
320
321 case IRQ_TYPE_EDGE_BOTH:
322 lvl_type = GPIO_INT_LVL_EDGE_BOTH;
323 break;
324
325 case IRQ_TYPE_LEVEL_HIGH:
326 lvl_type = GPIO_INT_LVL_LEVEL_HIGH;
327 break;
328
329 case IRQ_TYPE_LEVEL_LOW:
330 lvl_type = GPIO_INT_LVL_LEVEL_LOW;
331 break;
332
333 default:
334 return -EINVAL;
335 }
336
337 raw_spin_lock_irqsave(&bank->lvl_lock[port], flags);
338
339 val = tegra_gpio_readl(tgi, GPIO_INT_LVL(tgi, gpio));
340 val &= ~(GPIO_INT_LVL_MASK << GPIO_BIT(gpio));
341 val |= lvl_type << GPIO_BIT(gpio);
342 tegra_gpio_writel(tgi, val, GPIO_INT_LVL(tgi, gpio));
343
344 raw_spin_unlock_irqrestore(&bank->lvl_lock[port], flags);
345
346 tegra_gpio_mask_write(tgi, GPIO_MSK_OE(tgi, gpio), gpio, 0);
347 tegra_gpio_enable(tgi, gpio);
348
349 ret = gpiochip_lock_as_irq(&tgi->gc, gpio);
350 if (ret) {
351 dev_err(tgi->dev,
352 "unable to lock Tegra GPIO %u as IRQ\n", gpio);
353 tegra_gpio_disable(tgi, gpio);
354 return ret;
355 }
356
357 if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
358 irq_set_handler_locked(d, handle_level_irq);
359 else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
360 irq_set_handler_locked(d, handle_edge_irq);
361
362 if (d->parent_data)
363 ret = irq_chip_set_type_parent(d, type);
364
365 return ret;
366}
367
368static void tegra_gpio_irq_shutdown(struct irq_data *d)
369{
370 struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
371 struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
372 unsigned int gpio = d->hwirq;
373
374 tegra_gpio_irq_mask(d);
375 gpiochip_unlock_as_irq(&tgi->gc, gpio);
376}
377
378static void tegra_gpio_irq_handler(struct irq_desc *desc)
379{
380 struct tegra_gpio_info *tgi = irq_desc_get_handler_data(desc);
381 struct irq_chip *chip = irq_desc_get_chip(desc);
382 struct irq_domain *domain = tgi->gc.irq.domain;
383 unsigned int irq = irq_desc_get_irq(desc);
384 struct tegra_gpio_bank *bank = NULL;
385 unsigned int port, pin, gpio, i;
386 bool unmasked = false;
387 unsigned long sta;
388 u32 lvl;
389
390 for (i = 0; i < tgi->bank_count; i++) {
391 if (tgi->irqs[i] == irq) {
392 bank = &tgi->bank_info[i];
393 break;
394 }
395 }
396
397 if (WARN_ON(bank == NULL))
398 return;
399
400 chained_irq_enter(chip, desc);
401
402 for (port = 0; port < 4; port++) {
403 gpio = tegra_gpio_compose(bank->bank, port, 0);
404 sta = tegra_gpio_readl(tgi, GPIO_INT_STA(tgi, gpio)) &
405 tegra_gpio_readl(tgi, GPIO_INT_ENB(tgi, gpio));
406 lvl = tegra_gpio_readl(tgi, GPIO_INT_LVL(tgi, gpio));
407
408 for_each_set_bit(pin, &sta, 8) {
409 int ret;
410
411 tegra_gpio_writel(tgi, 1 << pin,
412 GPIO_INT_CLR(tgi, gpio));
413
414 /* if gpio is edge triggered, clear condition
415 * before executing the handler so that we don't
416 * miss edges
417 */
418 if (!unmasked && lvl & (0x100 << pin)) {
419 unmasked = true;
420 chained_irq_exit(chip, desc);
421 }
422
423 ret = generic_handle_domain_irq(domain, gpio + pin);
424 WARN_RATELIMIT(ret, "hwirq = %d", gpio + pin);
425 }
426 }
427
428 if (!unmasked)
429 chained_irq_exit(chip, desc);
430}
431
432static int tegra_gpio_child_to_parent_hwirq(struct gpio_chip *chip,
433 unsigned int hwirq,
434 unsigned int type,
435 unsigned int *parent_hwirq,
436 unsigned int *parent_type)
437{
438 *parent_hwirq = chip->irq.child_offset_to_irq(chip, hwirq);
439 *parent_type = type;
440
441 return 0;
442}
443
444static int tegra_gpio_populate_parent_fwspec(struct gpio_chip *chip,
445 union gpio_irq_fwspec *gfwspec,
446 unsigned int parent_hwirq,
447 unsigned int parent_type)
448{
449 struct irq_fwspec *fwspec = &gfwspec->fwspec;
450
451 fwspec->fwnode = chip->irq.parent_domain->fwnode;
452 fwspec->param_count = 3;
453 fwspec->param[0] = 0;
454 fwspec->param[1] = parent_hwirq;
455 fwspec->param[2] = parent_type;
456
457 return 0;
458}
459
460#ifdef CONFIG_PM_SLEEP
461static int tegra_gpio_resume(struct device *dev)
462{
463 struct tegra_gpio_info *tgi = dev_get_drvdata(dev);
464 unsigned int b, p;
465
466 for (b = 0; b < tgi->bank_count; b++) {
467 struct tegra_gpio_bank *bank = &tgi->bank_info[b];
468
469 for (p = 0; p < ARRAY_SIZE(bank->oe); p++) {
470 unsigned int gpio = (b << 5) | (p << 3);
471
472 tegra_gpio_writel(tgi, bank->cnf[p],
473 GPIO_CNF(tgi, gpio));
474
475 if (tgi->soc->debounce_supported) {
476 tegra_gpio_writel(tgi, bank->dbc_cnt[p],
477 GPIO_DBC_CNT(tgi, gpio));
478 tegra_gpio_writel(tgi, bank->dbc_enb[p],
479 GPIO_MSK_DBC_EN(tgi, gpio));
480 }
481
482 tegra_gpio_writel(tgi, bank->out[p],
483 GPIO_OUT(tgi, gpio));
484 tegra_gpio_writel(tgi, bank->oe[p],
485 GPIO_OE(tgi, gpio));
486 tegra_gpio_writel(tgi, bank->int_lvl[p],
487 GPIO_INT_LVL(tgi, gpio));
488 tegra_gpio_writel(tgi, bank->int_enb[p],
489 GPIO_INT_ENB(tgi, gpio));
490 }
491 }
492
493 return 0;
494}
495
496static int tegra_gpio_suspend(struct device *dev)
497{
498 struct tegra_gpio_info *tgi = dev_get_drvdata(dev);
499 unsigned int b, p;
500
501 for (b = 0; b < tgi->bank_count; b++) {
502 struct tegra_gpio_bank *bank = &tgi->bank_info[b];
503
504 for (p = 0; p < ARRAY_SIZE(bank->oe); p++) {
505 unsigned int gpio = (b << 5) | (p << 3);
506
507 bank->cnf[p] = tegra_gpio_readl(tgi,
508 GPIO_CNF(tgi, gpio));
509 bank->out[p] = tegra_gpio_readl(tgi,
510 GPIO_OUT(tgi, gpio));
511 bank->oe[p] = tegra_gpio_readl(tgi,
512 GPIO_OE(tgi, gpio));
513 if (tgi->soc->debounce_supported) {
514 bank->dbc_enb[p] = tegra_gpio_readl(tgi,
515 GPIO_MSK_DBC_EN(tgi, gpio));
516 bank->dbc_enb[p] = (bank->dbc_enb[p] << 8) |
517 bank->dbc_enb[p];
518 }
519
520 bank->int_enb[p] = tegra_gpio_readl(tgi,
521 GPIO_INT_ENB(tgi, gpio));
522 bank->int_lvl[p] = tegra_gpio_readl(tgi,
523 GPIO_INT_LVL(tgi, gpio));
524
525 /* Enable gpio irq for wake up source */
526 tegra_gpio_writel(tgi, bank->wake_enb[p],
527 GPIO_INT_ENB(tgi, gpio));
528 }
529 }
530
531 return 0;
532}
533
534static int tegra_gpio_irq_set_wake(struct irq_data *d, unsigned int enable)
535{
536 struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
537 struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
538 struct tegra_gpio_bank *bank;
539 unsigned int gpio = d->hwirq;
540 u32 port, bit, mask;
541 int err;
542
543 bank = &tgi->bank_info[GPIO_BANK(d->hwirq)];
544
545 port = GPIO_PORT(gpio);
546 bit = GPIO_BIT(gpio);
547 mask = BIT(bit);
548
549 err = irq_set_irq_wake(tgi->irqs[bank->bank], enable);
550 if (err)
551 return err;
552
553 if (d->parent_data) {
554 err = irq_chip_set_wake_parent(d, enable);
555 if (err) {
556 irq_set_irq_wake(tgi->irqs[bank->bank], !enable);
557 return err;
558 }
559 }
560
561 if (enable)
562 bank->wake_enb[port] |= mask;
563 else
564 bank->wake_enb[port] &= ~mask;
565
566 return 0;
567}
568#endif
569
570static int tegra_gpio_irq_set_affinity(struct irq_data *data,
571 const struct cpumask *dest,
572 bool force)
573{
574 if (data->parent_data)
575 return irq_chip_set_affinity_parent(data, dest, force);
576
577 return -EINVAL;
578}
579
580static int tegra_gpio_irq_request_resources(struct irq_data *d)
581{
582 struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
583 struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
584
585 tegra_gpio_enable(tgi, d->hwirq);
586
587 return gpiochip_reqres_irq(chip, d->hwirq);
588}
589
590static void tegra_gpio_irq_release_resources(struct irq_data *d)
591{
592 struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
593 struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
594
595 gpiochip_relres_irq(chip, d->hwirq);
596 tegra_gpio_enable(tgi, d->hwirq);
597}
598
599static void tegra_gpio_irq_print_chip(struct irq_data *d, struct seq_file *s)
600{
601 struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
602
603 seq_puts(s, dev_name(chip->parent));
604}
605
606static const struct irq_chip tegra_gpio_irq_chip = {
607 .irq_shutdown = tegra_gpio_irq_shutdown,
608 .irq_ack = tegra_gpio_irq_ack,
609 .irq_mask = tegra_gpio_irq_mask,
610 .irq_unmask = tegra_gpio_irq_unmask,
611 .irq_set_type = tegra_gpio_irq_set_type,
612#ifdef CONFIG_PM_SLEEP
613 .irq_set_wake = tegra_gpio_irq_set_wake,
614#endif
615 .irq_print_chip = tegra_gpio_irq_print_chip,
616 .irq_request_resources = tegra_gpio_irq_request_resources,
617 .irq_release_resources = tegra_gpio_irq_release_resources,
618 .flags = IRQCHIP_IMMUTABLE,
619};
620
621static const struct irq_chip tegra210_gpio_irq_chip = {
622 .irq_shutdown = tegra_gpio_irq_shutdown,
623 .irq_ack = tegra_gpio_irq_ack,
624 .irq_mask = tegra_gpio_irq_mask,
625 .irq_unmask = tegra_gpio_irq_unmask,
626 .irq_set_affinity = tegra_gpio_irq_set_affinity,
627 .irq_set_type = tegra_gpio_irq_set_type,
628#ifdef CONFIG_PM_SLEEP
629 .irq_set_wake = tegra_gpio_irq_set_wake,
630#endif
631 .irq_print_chip = tegra_gpio_irq_print_chip,
632 .irq_request_resources = tegra_gpio_irq_request_resources,
633 .irq_release_resources = tegra_gpio_irq_release_resources,
634 .flags = IRQCHIP_IMMUTABLE,
635};
636
637#ifdef CONFIG_DEBUG_FS
638
639#include <linux/debugfs.h>
640
641static int tegra_dbg_gpio_show(struct seq_file *s, void *unused)
642{
643 struct tegra_gpio_info *tgi = dev_get_drvdata(s->private);
644 unsigned int i, j;
645
646 for (i = 0; i < tgi->bank_count; i++) {
647 for (j = 0; j < 4; j++) {
648 unsigned int gpio = tegra_gpio_compose(i, j, 0);
649
650 seq_printf(s,
651 "%u:%u %02x %02x %02x %02x %02x %02x %06x\n",
652 i, j,
653 tegra_gpio_readl(tgi, GPIO_CNF(tgi, gpio)),
654 tegra_gpio_readl(tgi, GPIO_OE(tgi, gpio)),
655 tegra_gpio_readl(tgi, GPIO_OUT(tgi, gpio)),
656 tegra_gpio_readl(tgi, GPIO_IN(tgi, gpio)),
657 tegra_gpio_readl(tgi, GPIO_INT_STA(tgi, gpio)),
658 tegra_gpio_readl(tgi, GPIO_INT_ENB(tgi, gpio)),
659 tegra_gpio_readl(tgi, GPIO_INT_LVL(tgi, gpio)));
660 }
661 }
662 return 0;
663}
664
665static void tegra_gpio_debuginit(struct tegra_gpio_info *tgi)
666{
667 debugfs_create_devm_seqfile(tgi->dev, "tegra_gpio", NULL,
668 tegra_dbg_gpio_show);
669}
670
671#else
672
673static inline void tegra_gpio_debuginit(struct tegra_gpio_info *tgi)
674{
675}
676
677#endif
678
679static const struct dev_pm_ops tegra_gpio_pm_ops = {
680 SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(tegra_gpio_suspend, tegra_gpio_resume)
681};
682
683static const struct of_device_id tegra_pmc_of_match[] = {
684 { .compatible = "nvidia,tegra210-pmc", },
685 { /* sentinel */ },
686};
687
688static int tegra_gpio_probe(struct platform_device *pdev)
689{
690 struct tegra_gpio_bank *bank;
691 struct tegra_gpio_info *tgi;
692 struct gpio_irq_chip *irq;
693 struct device_node *np;
694 unsigned int i, j;
695 int ret;
696
697 tgi = devm_kzalloc(&pdev->dev, sizeof(*tgi), GFP_KERNEL);
698 if (!tgi)
699 return -ENODEV;
700
701 tgi->soc = of_device_get_match_data(&pdev->dev);
702 tgi->dev = &pdev->dev;
703
704 ret = platform_irq_count(pdev);
705 if (ret < 0)
706 return ret;
707
708 tgi->bank_count = ret;
709
710 if (!tgi->bank_count) {
711 dev_err(&pdev->dev, "Missing IRQ resource\n");
712 return -ENODEV;
713 }
714
715 tgi->gc.label = "tegra-gpio";
716 tgi->gc.request = pinctrl_gpio_request;
717 tgi->gc.free = tegra_gpio_free;
718 tgi->gc.direction_input = tegra_gpio_direction_input;
719 tgi->gc.get = tegra_gpio_get;
720 tgi->gc.direction_output = tegra_gpio_direction_output;
721 tgi->gc.set = tegra_gpio_set;
722 tgi->gc.get_direction = tegra_gpio_get_direction;
723 tgi->gc.base = 0;
724 tgi->gc.ngpio = tgi->bank_count * 32;
725 tgi->gc.parent = &pdev->dev;
726
727 platform_set_drvdata(pdev, tgi);
728
729 if (tgi->soc->debounce_supported)
730 tgi->gc.set_config = tegra_gpio_set_config;
731
732 tgi->bank_info = devm_kcalloc(&pdev->dev, tgi->bank_count,
733 sizeof(*tgi->bank_info), GFP_KERNEL);
734 if (!tgi->bank_info)
735 return -ENOMEM;
736
737 tgi->irqs = devm_kcalloc(&pdev->dev, tgi->bank_count,
738 sizeof(*tgi->irqs), GFP_KERNEL);
739 if (!tgi->irqs)
740 return -ENOMEM;
741
742 for (i = 0; i < tgi->bank_count; i++) {
743 ret = platform_get_irq(pdev, i);
744 if (ret < 0)
745 return ret;
746
747 bank = &tgi->bank_info[i];
748 bank->bank = i;
749
750 tgi->irqs[i] = ret;
751
752 for (j = 0; j < 4; j++) {
753 raw_spin_lock_init(&bank->lvl_lock[j]);
754 spin_lock_init(&bank->dbc_lock[j]);
755 }
756 }
757
758 irq = &tgi->gc.irq;
759 irq->fwnode = dev_fwnode(&pdev->dev);
760 irq->child_to_parent_hwirq = tegra_gpio_child_to_parent_hwirq;
761 irq->populate_parent_alloc_arg = tegra_gpio_populate_parent_fwspec;
762 irq->handler = handle_simple_irq;
763 irq->default_type = IRQ_TYPE_NONE;
764 irq->parent_handler = tegra_gpio_irq_handler;
765 irq->parent_handler_data = tgi;
766 irq->num_parents = tgi->bank_count;
767 irq->parents = tgi->irqs;
768
769 np = of_find_matching_node(NULL, tegra_pmc_of_match);
770 if (np) {
771 irq->parent_domain = irq_find_host(np);
772 of_node_put(np);
773
774 if (!irq->parent_domain)
775 return -EPROBE_DEFER;
776
777 gpio_irq_chip_set_chip(irq, &tegra210_gpio_irq_chip);
778 } else {
779 gpio_irq_chip_set_chip(irq, &tegra_gpio_irq_chip);
780 }
781
782 tgi->regs = devm_platform_ioremap_resource(pdev, 0);
783 if (IS_ERR(tgi->regs))
784 return PTR_ERR(tgi->regs);
785
786 for (i = 0; i < tgi->bank_count; i++) {
787 for (j = 0; j < 4; j++) {
788 int gpio = tegra_gpio_compose(i, j, 0);
789
790 tegra_gpio_writel(tgi, 0x00, GPIO_INT_ENB(tgi, gpio));
791 }
792 }
793
794 ret = devm_gpiochip_add_data(&pdev->dev, &tgi->gc, tgi);
795 if (ret < 0)
796 return ret;
797
798 tegra_gpio_debuginit(tgi);
799
800 return 0;
801}
802
803static const struct tegra_gpio_soc_config tegra20_gpio_config = {
804 .bank_stride = 0x80,
805 .upper_offset = 0x800,
806};
807
808static const struct tegra_gpio_soc_config tegra30_gpio_config = {
809 .bank_stride = 0x100,
810 .upper_offset = 0x80,
811};
812
813static const struct tegra_gpio_soc_config tegra210_gpio_config = {
814 .debounce_supported = true,
815 .bank_stride = 0x100,
816 .upper_offset = 0x80,
817};
818
819static const struct of_device_id tegra_gpio_of_match[] = {
820 { .compatible = "nvidia,tegra210-gpio", .data = &tegra210_gpio_config },
821 { .compatible = "nvidia,tegra30-gpio", .data = &tegra30_gpio_config },
822 { .compatible = "nvidia,tegra20-gpio", .data = &tegra20_gpio_config },
823 { },
824};
825MODULE_DEVICE_TABLE(of, tegra_gpio_of_match);
826
827static struct platform_driver tegra_gpio_driver = {
828 .driver = {
829 .name = "tegra-gpio",
830 .pm = &tegra_gpio_pm_ops,
831 .of_match_table = tegra_gpio_of_match,
832 },
833 .probe = tegra_gpio_probe,
834};
835module_platform_driver(tegra_gpio_driver);
836
837MODULE_DESCRIPTION("NVIDIA Tegra GPIO controller driver");
838MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
839MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
840MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>");
841MODULE_AUTHOR("Erik Gilling <konkers@google.com>");
842MODULE_LICENSE("GPL v2");
1/*
2 * arch/arm/mach-tegra/gpio.c
3 *
4 * Copyright (c) 2010 Google, Inc
5 *
6 * Author:
7 * Erik Gilling <konkers@google.com>
8 *
9 * This software is licensed under the terms of the GNU General Public
10 * License version 2, as published by the Free Software Foundation, and
11 * may be copied, distributed, and modified under those terms.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 */
19
20#include <linux/init.h>
21#include <linux/irq.h>
22#include <linux/interrupt.h>
23
24#include <linux/io.h>
25#include <linux/gpio.h>
26#include <linux/of.h>
27
28#include <asm/mach/irq.h>
29
30#include <mach/iomap.h>
31#include <mach/suspend.h>
32
33#define GPIO_BANK(x) ((x) >> 5)
34#define GPIO_PORT(x) (((x) >> 3) & 0x3)
35#define GPIO_BIT(x) ((x) & 0x7)
36
37#define GPIO_REG(x) (IO_TO_VIRT(TEGRA_GPIO_BASE) + \
38 GPIO_BANK(x) * 0x80 + \
39 GPIO_PORT(x) * 4)
40
41#define GPIO_CNF(x) (GPIO_REG(x) + 0x00)
42#define GPIO_OE(x) (GPIO_REG(x) + 0x10)
43#define GPIO_OUT(x) (GPIO_REG(x) + 0X20)
44#define GPIO_IN(x) (GPIO_REG(x) + 0x30)
45#define GPIO_INT_STA(x) (GPIO_REG(x) + 0x40)
46#define GPIO_INT_ENB(x) (GPIO_REG(x) + 0x50)
47#define GPIO_INT_LVL(x) (GPIO_REG(x) + 0x60)
48#define GPIO_INT_CLR(x) (GPIO_REG(x) + 0x70)
49
50#define GPIO_MSK_CNF(x) (GPIO_REG(x) + 0x800)
51#define GPIO_MSK_OE(x) (GPIO_REG(x) + 0x810)
52#define GPIO_MSK_OUT(x) (GPIO_REG(x) + 0X820)
53#define GPIO_MSK_INT_STA(x) (GPIO_REG(x) + 0x840)
54#define GPIO_MSK_INT_ENB(x) (GPIO_REG(x) + 0x850)
55#define GPIO_MSK_INT_LVL(x) (GPIO_REG(x) + 0x860)
56
57#define GPIO_INT_LVL_MASK 0x010101
58#define GPIO_INT_LVL_EDGE_RISING 0x000101
59#define GPIO_INT_LVL_EDGE_FALLING 0x000100
60#define GPIO_INT_LVL_EDGE_BOTH 0x010100
61#define GPIO_INT_LVL_LEVEL_HIGH 0x000001
62#define GPIO_INT_LVL_LEVEL_LOW 0x000000
63
64struct tegra_gpio_bank {
65 int bank;
66 int irq;
67 spinlock_t lvl_lock[4];
68#ifdef CONFIG_PM
69 u32 cnf[4];
70 u32 out[4];
71 u32 oe[4];
72 u32 int_enb[4];
73 u32 int_lvl[4];
74#endif
75};
76
77
78static struct tegra_gpio_bank tegra_gpio_banks[] = {
79 {.bank = 0, .irq = INT_GPIO1},
80 {.bank = 1, .irq = INT_GPIO2},
81 {.bank = 2, .irq = INT_GPIO3},
82 {.bank = 3, .irq = INT_GPIO4},
83 {.bank = 4, .irq = INT_GPIO5},
84 {.bank = 5, .irq = INT_GPIO6},
85 {.bank = 6, .irq = INT_GPIO7},
86};
87
88static int tegra_gpio_compose(int bank, int port, int bit)
89{
90 return (bank << 5) | ((port & 0x3) << 3) | (bit & 0x7);
91}
92
93static void tegra_gpio_mask_write(u32 reg, int gpio, int value)
94{
95 u32 val;
96
97 val = 0x100 << GPIO_BIT(gpio);
98 if (value)
99 val |= 1 << GPIO_BIT(gpio);
100 __raw_writel(val, reg);
101}
102
103void tegra_gpio_enable(int gpio)
104{
105 tegra_gpio_mask_write(GPIO_MSK_CNF(gpio), gpio, 1);
106}
107
108void tegra_gpio_disable(int gpio)
109{
110 tegra_gpio_mask_write(GPIO_MSK_CNF(gpio), gpio, 0);
111}
112
113static void tegra_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
114{
115 tegra_gpio_mask_write(GPIO_MSK_OUT(offset), offset, value);
116}
117
118static int tegra_gpio_get(struct gpio_chip *chip, unsigned offset)
119{
120 return (__raw_readl(GPIO_IN(offset)) >> GPIO_BIT(offset)) & 0x1;
121}
122
123static int tegra_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
124{
125 tegra_gpio_mask_write(GPIO_MSK_OE(offset), offset, 0);
126 return 0;
127}
128
129static int tegra_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
130 int value)
131{
132 tegra_gpio_set(chip, offset, value);
133 tegra_gpio_mask_write(GPIO_MSK_OE(offset), offset, 1);
134 return 0;
135}
136
137
138
139static struct gpio_chip tegra_gpio_chip = {
140 .label = "tegra-gpio",
141 .direction_input = tegra_gpio_direction_input,
142 .get = tegra_gpio_get,
143 .direction_output = tegra_gpio_direction_output,
144 .set = tegra_gpio_set,
145 .base = 0,
146 .ngpio = TEGRA_NR_GPIOS,
147};
148
149static void tegra_gpio_irq_ack(struct irq_data *d)
150{
151 int gpio = d->irq - INT_GPIO_BASE;
152
153 __raw_writel(1 << GPIO_BIT(gpio), GPIO_INT_CLR(gpio));
154}
155
156static void tegra_gpio_irq_mask(struct irq_data *d)
157{
158 int gpio = d->irq - INT_GPIO_BASE;
159
160 tegra_gpio_mask_write(GPIO_MSK_INT_ENB(gpio), gpio, 0);
161}
162
163static void tegra_gpio_irq_unmask(struct irq_data *d)
164{
165 int gpio = d->irq - INT_GPIO_BASE;
166
167 tegra_gpio_mask_write(GPIO_MSK_INT_ENB(gpio), gpio, 1);
168}
169
170static int tegra_gpio_irq_set_type(struct irq_data *d, unsigned int type)
171{
172 int gpio = d->irq - INT_GPIO_BASE;
173 struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d);
174 int port = GPIO_PORT(gpio);
175 int lvl_type;
176 int val;
177 unsigned long flags;
178
179 switch (type & IRQ_TYPE_SENSE_MASK) {
180 case IRQ_TYPE_EDGE_RISING:
181 lvl_type = GPIO_INT_LVL_EDGE_RISING;
182 break;
183
184 case IRQ_TYPE_EDGE_FALLING:
185 lvl_type = GPIO_INT_LVL_EDGE_FALLING;
186 break;
187
188 case IRQ_TYPE_EDGE_BOTH:
189 lvl_type = GPIO_INT_LVL_EDGE_BOTH;
190 break;
191
192 case IRQ_TYPE_LEVEL_HIGH:
193 lvl_type = GPIO_INT_LVL_LEVEL_HIGH;
194 break;
195
196 case IRQ_TYPE_LEVEL_LOW:
197 lvl_type = GPIO_INT_LVL_LEVEL_LOW;
198 break;
199
200 default:
201 return -EINVAL;
202 }
203
204 spin_lock_irqsave(&bank->lvl_lock[port], flags);
205
206 val = __raw_readl(GPIO_INT_LVL(gpio));
207 val &= ~(GPIO_INT_LVL_MASK << GPIO_BIT(gpio));
208 val |= lvl_type << GPIO_BIT(gpio);
209 __raw_writel(val, GPIO_INT_LVL(gpio));
210
211 spin_unlock_irqrestore(&bank->lvl_lock[port], flags);
212
213 if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
214 __irq_set_handler_locked(d->irq, handle_level_irq);
215 else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
216 __irq_set_handler_locked(d->irq, handle_edge_irq);
217
218 return 0;
219}
220
221static void tegra_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
222{
223 struct tegra_gpio_bank *bank;
224 int port;
225 int pin;
226 int unmasked = 0;
227 struct irq_chip *chip = irq_desc_get_chip(desc);
228
229 chained_irq_enter(chip, desc);
230
231 bank = irq_get_handler_data(irq);
232
233 for (port = 0; port < 4; port++) {
234 int gpio = tegra_gpio_compose(bank->bank, port, 0);
235 unsigned long sta = __raw_readl(GPIO_INT_STA(gpio)) &
236 __raw_readl(GPIO_INT_ENB(gpio));
237 u32 lvl = __raw_readl(GPIO_INT_LVL(gpio));
238
239 for_each_set_bit(pin, &sta, 8) {
240 __raw_writel(1 << pin, GPIO_INT_CLR(gpio));
241
242 /* if gpio is edge triggered, clear condition
243 * before executing the hander so that we don't
244 * miss edges
245 */
246 if (lvl & (0x100 << pin)) {
247 unmasked = 1;
248 chained_irq_exit(chip, desc);
249 }
250
251 generic_handle_irq(gpio_to_irq(gpio + pin));
252 }
253 }
254
255 if (!unmasked)
256 chained_irq_exit(chip, desc);
257
258}
259
260#ifdef CONFIG_PM
261void tegra_gpio_resume(void)
262{
263 unsigned long flags;
264 int b;
265 int p;
266
267 local_irq_save(flags);
268
269 for (b = 0; b < ARRAY_SIZE(tegra_gpio_banks); b++) {
270 struct tegra_gpio_bank *bank = &tegra_gpio_banks[b];
271
272 for (p = 0; p < ARRAY_SIZE(bank->oe); p++) {
273 unsigned int gpio = (b<<5) | (p<<3);
274 __raw_writel(bank->cnf[p], GPIO_CNF(gpio));
275 __raw_writel(bank->out[p], GPIO_OUT(gpio));
276 __raw_writel(bank->oe[p], GPIO_OE(gpio));
277 __raw_writel(bank->int_lvl[p], GPIO_INT_LVL(gpio));
278 __raw_writel(bank->int_enb[p], GPIO_INT_ENB(gpio));
279 }
280 }
281
282 local_irq_restore(flags);
283}
284
285void tegra_gpio_suspend(void)
286{
287 unsigned long flags;
288 int b;
289 int p;
290
291 local_irq_save(flags);
292 for (b = 0; b < ARRAY_SIZE(tegra_gpio_banks); b++) {
293 struct tegra_gpio_bank *bank = &tegra_gpio_banks[b];
294
295 for (p = 0; p < ARRAY_SIZE(bank->oe); p++) {
296 unsigned int gpio = (b<<5) | (p<<3);
297 bank->cnf[p] = __raw_readl(GPIO_CNF(gpio));
298 bank->out[p] = __raw_readl(GPIO_OUT(gpio));
299 bank->oe[p] = __raw_readl(GPIO_OE(gpio));
300 bank->int_enb[p] = __raw_readl(GPIO_INT_ENB(gpio));
301 bank->int_lvl[p] = __raw_readl(GPIO_INT_LVL(gpio));
302 }
303 }
304 local_irq_restore(flags);
305}
306
307static int tegra_gpio_wake_enable(struct irq_data *d, unsigned int enable)
308{
309 struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d);
310 return irq_set_irq_wake(bank->irq, enable);
311}
312#endif
313
314static struct irq_chip tegra_gpio_irq_chip = {
315 .name = "GPIO",
316 .irq_ack = tegra_gpio_irq_ack,
317 .irq_mask = tegra_gpio_irq_mask,
318 .irq_unmask = tegra_gpio_irq_unmask,
319 .irq_set_type = tegra_gpio_irq_set_type,
320#ifdef CONFIG_PM
321 .irq_set_wake = tegra_gpio_wake_enable,
322#endif
323};
324
325
326/* This lock class tells lockdep that GPIO irqs are in a different
327 * category than their parents, so it won't report false recursion.
328 */
329static struct lock_class_key gpio_lock_class;
330
331static int __init tegra_gpio_init(void)
332{
333 struct tegra_gpio_bank *bank;
334 int i;
335 int j;
336
337 for (i = 0; i < 7; i++) {
338 for (j = 0; j < 4; j++) {
339 int gpio = tegra_gpio_compose(i, j, 0);
340 __raw_writel(0x00, GPIO_INT_ENB(gpio));
341 }
342 }
343
344#ifdef CONFIG_OF_GPIO
345 /*
346 * This isn't ideal, but it gets things hooked up until this
347 * driver is converted into a platform_device
348 */
349 tegra_gpio_chip.of_node = of_find_compatible_node(NULL, NULL,
350 "nvidia,tegra20-gpio");
351#endif /* CONFIG_OF_GPIO */
352
353 gpiochip_add(&tegra_gpio_chip);
354
355 for (i = INT_GPIO_BASE; i < (INT_GPIO_BASE + TEGRA_NR_GPIOS); i++) {
356 bank = &tegra_gpio_banks[GPIO_BANK(irq_to_gpio(i))];
357
358 irq_set_lockdep_class(i, &gpio_lock_class);
359 irq_set_chip_data(i, bank);
360 irq_set_chip_and_handler(i, &tegra_gpio_irq_chip,
361 handle_simple_irq);
362 set_irq_flags(i, IRQF_VALID);
363 }
364
365 for (i = 0; i < ARRAY_SIZE(tegra_gpio_banks); i++) {
366 bank = &tegra_gpio_banks[i];
367
368 irq_set_chained_handler(bank->irq, tegra_gpio_irq_handler);
369 irq_set_handler_data(bank->irq, bank);
370
371 for (j = 0; j < 4; j++)
372 spin_lock_init(&bank->lvl_lock[j]);
373 }
374
375 return 0;
376}
377
378postcore_initcall(tegra_gpio_init);
379
380void __init tegra_gpio_config(struct tegra_gpio_table *table, int num)
381{
382 int i;
383
384 for (i = 0; i < num; i++) {
385 int gpio = table[i].gpio;
386
387 if (table[i].enable)
388 tegra_gpio_enable(gpio);
389 else
390 tegra_gpio_disable(gpio);
391 }
392}
393
394#ifdef CONFIG_DEBUG_FS
395
396#include <linux/debugfs.h>
397#include <linux/seq_file.h>
398
399static int dbg_gpio_show(struct seq_file *s, void *unused)
400{
401 int i;
402 int j;
403
404 for (i = 0; i < 7; i++) {
405 for (j = 0; j < 4; j++) {
406 int gpio = tegra_gpio_compose(i, j, 0);
407 seq_printf(s,
408 "%d:%d %02x %02x %02x %02x %02x %02x %06x\n",
409 i, j,
410 __raw_readl(GPIO_CNF(gpio)),
411 __raw_readl(GPIO_OE(gpio)),
412 __raw_readl(GPIO_OUT(gpio)),
413 __raw_readl(GPIO_IN(gpio)),
414 __raw_readl(GPIO_INT_STA(gpio)),
415 __raw_readl(GPIO_INT_ENB(gpio)),
416 __raw_readl(GPIO_INT_LVL(gpio)));
417 }
418 }
419 return 0;
420}
421
422static int dbg_gpio_open(struct inode *inode, struct file *file)
423{
424 return single_open(file, dbg_gpio_show, &inode->i_private);
425}
426
427static const struct file_operations debug_fops = {
428 .open = dbg_gpio_open,
429 .read = seq_read,
430 .llseek = seq_lseek,
431 .release = single_release,
432};
433
434static int __init tegra_gpio_debuginit(void)
435{
436 (void) debugfs_create_file("tegra_gpio", S_IRUGO,
437 NULL, NULL, &debug_fops);
438 return 0;
439}
440late_initcall(tegra_gpio_debuginit);
441#endif