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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/err.h>
21#include <linux/init.h>
22#include <linux/irq.h>
23#include <linux/interrupt.h>
24#include <linux/io.h>
25#include <linux/gpio.h>
26#include <linux/of_device.h>
27#include <linux/platform_device.h>
28#include <linux/module.h>
29#include <linux/irqdomain.h>
30#include <linux/irqchip/chained_irq.h>
31#include <linux/pinctrl/consumer.h>
32#include <linux/pm.h>
33
34#define GPIO_BANK(x) ((x) >> 5)
35#define GPIO_PORT(x) (((x) >> 3) & 0x3)
36#define GPIO_BIT(x) ((x) & 0x7)
37
38#define GPIO_REG(x) (GPIO_BANK(x) * tegra_gpio_bank_stride + \
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) + tegra_gpio_upper_offset + 0x00)
51#define GPIO_MSK_OE(x) (GPIO_REG(x) + tegra_gpio_upper_offset + 0x10)
52#define GPIO_MSK_OUT(x) (GPIO_REG(x) + tegra_gpio_upper_offset + 0X20)
53#define GPIO_MSK_INT_STA(x) (GPIO_REG(x) + tegra_gpio_upper_offset + 0x40)
54#define GPIO_MSK_INT_ENB(x) (GPIO_REG(x) + tegra_gpio_upper_offset + 0x50)
55#define GPIO_MSK_INT_LVL(x) (GPIO_REG(x) + tegra_gpio_upper_offset + 0x60)
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_SLEEP
69 u32 cnf[4];
70 u32 out[4];
71 u32 oe[4];
72 u32 int_enb[4];
73 u32 int_lvl[4];
74 u32 wake_enb[4];
75#endif
76};
77
78static struct device *dev;
79static struct irq_domain *irq_domain;
80static void __iomem *regs;
81static u32 tegra_gpio_bank_count;
82static u32 tegra_gpio_bank_stride;
83static u32 tegra_gpio_upper_offset;
84static struct tegra_gpio_bank *tegra_gpio_banks;
85
86static inline void tegra_gpio_writel(u32 val, u32 reg)
87{
88 __raw_writel(val, regs + reg);
89}
90
91static inline u32 tegra_gpio_readl(u32 reg)
92{
93 return __raw_readl(regs + reg);
94}
95
96static int tegra_gpio_compose(int bank, int port, int bit)
97{
98 return (bank << 5) | ((port & 0x3) << 3) | (bit & 0x7);
99}
100
101static void tegra_gpio_mask_write(u32 reg, int gpio, int value)
102{
103 u32 val;
104
105 val = 0x100 << GPIO_BIT(gpio);
106 if (value)
107 val |= 1 << GPIO_BIT(gpio);
108 tegra_gpio_writel(val, reg);
109}
110
111static void tegra_gpio_enable(int gpio)
112{
113 tegra_gpio_mask_write(GPIO_MSK_CNF(gpio), gpio, 1);
114}
115
116static void tegra_gpio_disable(int gpio)
117{
118 tegra_gpio_mask_write(GPIO_MSK_CNF(gpio), gpio, 0);
119}
120
121static int tegra_gpio_request(struct gpio_chip *chip, unsigned offset)
122{
123 return pinctrl_request_gpio(offset);
124}
125
126static void tegra_gpio_free(struct gpio_chip *chip, unsigned offset)
127{
128 pinctrl_free_gpio(offset);
129 tegra_gpio_disable(offset);
130}
131
132static void tegra_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
133{
134 tegra_gpio_mask_write(GPIO_MSK_OUT(offset), offset, value);
135}
136
137static int tegra_gpio_get(struct gpio_chip *chip, unsigned offset)
138{
139 /* If gpio is in output mode then read from the out value */
140 if ((tegra_gpio_readl(GPIO_OE(offset)) >> GPIO_BIT(offset)) & 1)
141 return (tegra_gpio_readl(GPIO_OUT(offset)) >>
142 GPIO_BIT(offset)) & 0x1;
143
144 return (tegra_gpio_readl(GPIO_IN(offset)) >> GPIO_BIT(offset)) & 0x1;
145}
146
147static int tegra_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
148{
149 tegra_gpio_mask_write(GPIO_MSK_OE(offset), offset, 0);
150 tegra_gpio_enable(offset);
151 return 0;
152}
153
154static int tegra_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
155 int value)
156{
157 tegra_gpio_set(chip, offset, value);
158 tegra_gpio_mask_write(GPIO_MSK_OE(offset), offset, 1);
159 tegra_gpio_enable(offset);
160 return 0;
161}
162
163static int tegra_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
164{
165 return irq_find_mapping(irq_domain, offset);
166}
167
168static struct gpio_chip tegra_gpio_chip = {
169 .label = "tegra-gpio",
170 .request = tegra_gpio_request,
171 .free = tegra_gpio_free,
172 .direction_input = tegra_gpio_direction_input,
173 .get = tegra_gpio_get,
174 .direction_output = tegra_gpio_direction_output,
175 .set = tegra_gpio_set,
176 .to_irq = tegra_gpio_to_irq,
177 .base = 0,
178};
179
180static void tegra_gpio_irq_ack(struct irq_data *d)
181{
182 int gpio = d->hwirq;
183
184 tegra_gpio_writel(1 << GPIO_BIT(gpio), GPIO_INT_CLR(gpio));
185}
186
187static void tegra_gpio_irq_mask(struct irq_data *d)
188{
189 int gpio = d->hwirq;
190
191 tegra_gpio_mask_write(GPIO_MSK_INT_ENB(gpio), gpio, 0);
192}
193
194static void tegra_gpio_irq_unmask(struct irq_data *d)
195{
196 int gpio = d->hwirq;
197
198 tegra_gpio_mask_write(GPIO_MSK_INT_ENB(gpio), gpio, 1);
199}
200
201static int tegra_gpio_irq_set_type(struct irq_data *d, unsigned int type)
202{
203 int gpio = d->hwirq;
204 struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d);
205 int port = GPIO_PORT(gpio);
206 int lvl_type;
207 int val;
208 unsigned long flags;
209 int ret;
210
211 switch (type & IRQ_TYPE_SENSE_MASK) {
212 case IRQ_TYPE_EDGE_RISING:
213 lvl_type = GPIO_INT_LVL_EDGE_RISING;
214 break;
215
216 case IRQ_TYPE_EDGE_FALLING:
217 lvl_type = GPIO_INT_LVL_EDGE_FALLING;
218 break;
219
220 case IRQ_TYPE_EDGE_BOTH:
221 lvl_type = GPIO_INT_LVL_EDGE_BOTH;
222 break;
223
224 case IRQ_TYPE_LEVEL_HIGH:
225 lvl_type = GPIO_INT_LVL_LEVEL_HIGH;
226 break;
227
228 case IRQ_TYPE_LEVEL_LOW:
229 lvl_type = GPIO_INT_LVL_LEVEL_LOW;
230 break;
231
232 default:
233 return -EINVAL;
234 }
235
236 ret = gpiochip_lock_as_irq(&tegra_gpio_chip, gpio);
237 if (ret) {
238 dev_err(dev, "unable to lock Tegra GPIO %d as IRQ\n", gpio);
239 return ret;
240 }
241
242 spin_lock_irqsave(&bank->lvl_lock[port], flags);
243
244 val = tegra_gpio_readl(GPIO_INT_LVL(gpio));
245 val &= ~(GPIO_INT_LVL_MASK << GPIO_BIT(gpio));
246 val |= lvl_type << GPIO_BIT(gpio);
247 tegra_gpio_writel(val, GPIO_INT_LVL(gpio));
248
249 spin_unlock_irqrestore(&bank->lvl_lock[port], flags);
250
251 tegra_gpio_mask_write(GPIO_MSK_OE(gpio), gpio, 0);
252 tegra_gpio_enable(gpio);
253
254 if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
255 irq_set_handler_locked(d, handle_level_irq);
256 else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
257 irq_set_handler_locked(d, handle_edge_irq);
258
259 return 0;
260}
261
262static void tegra_gpio_irq_shutdown(struct irq_data *d)
263{
264 int gpio = d->hwirq;
265
266 gpiochip_unlock_as_irq(&tegra_gpio_chip, gpio);
267}
268
269static void tegra_gpio_irq_handler(struct irq_desc *desc)
270{
271 int port;
272 int pin;
273 int unmasked = 0;
274 struct irq_chip *chip = irq_desc_get_chip(desc);
275 struct tegra_gpio_bank *bank = irq_desc_get_handler_data(desc);
276
277 chained_irq_enter(chip, desc);
278
279 for (port = 0; port < 4; port++) {
280 int gpio = tegra_gpio_compose(bank->bank, port, 0);
281 unsigned long sta = tegra_gpio_readl(GPIO_INT_STA(gpio)) &
282 tegra_gpio_readl(GPIO_INT_ENB(gpio));
283 u32 lvl = tegra_gpio_readl(GPIO_INT_LVL(gpio));
284
285 for_each_set_bit(pin, &sta, 8) {
286 tegra_gpio_writel(1 << pin, GPIO_INT_CLR(gpio));
287
288 /* if gpio is edge triggered, clear condition
289 * before executing the handler so that we don't
290 * miss edges
291 */
292 if (lvl & (0x100 << pin)) {
293 unmasked = 1;
294 chained_irq_exit(chip, desc);
295 }
296
297 generic_handle_irq(gpio_to_irq(gpio + pin));
298 }
299 }
300
301 if (!unmasked)
302 chained_irq_exit(chip, desc);
303
304}
305
306#ifdef CONFIG_PM_SLEEP
307static int tegra_gpio_resume(struct device *dev)
308{
309 unsigned long flags;
310 int b;
311 int p;
312
313 local_irq_save(flags);
314
315 for (b = 0; b < tegra_gpio_bank_count; b++) {
316 struct tegra_gpio_bank *bank = &tegra_gpio_banks[b];
317
318 for (p = 0; p < ARRAY_SIZE(bank->oe); p++) {
319 unsigned int gpio = (b<<5) | (p<<3);
320 tegra_gpio_writel(bank->cnf[p], GPIO_CNF(gpio));
321 tegra_gpio_writel(bank->out[p], GPIO_OUT(gpio));
322 tegra_gpio_writel(bank->oe[p], GPIO_OE(gpio));
323 tegra_gpio_writel(bank->int_lvl[p], GPIO_INT_LVL(gpio));
324 tegra_gpio_writel(bank->int_enb[p], GPIO_INT_ENB(gpio));
325 }
326 }
327
328 local_irq_restore(flags);
329 return 0;
330}
331
332static int tegra_gpio_suspend(struct device *dev)
333{
334 unsigned long flags;
335 int b;
336 int p;
337
338 local_irq_save(flags);
339 for (b = 0; b < tegra_gpio_bank_count; b++) {
340 struct tegra_gpio_bank *bank = &tegra_gpio_banks[b];
341
342 for (p = 0; p < ARRAY_SIZE(bank->oe); p++) {
343 unsigned int gpio = (b<<5) | (p<<3);
344 bank->cnf[p] = tegra_gpio_readl(GPIO_CNF(gpio));
345 bank->out[p] = tegra_gpio_readl(GPIO_OUT(gpio));
346 bank->oe[p] = tegra_gpio_readl(GPIO_OE(gpio));
347 bank->int_enb[p] = tegra_gpio_readl(GPIO_INT_ENB(gpio));
348 bank->int_lvl[p] = tegra_gpio_readl(GPIO_INT_LVL(gpio));
349
350 /* Enable gpio irq for wake up source */
351 tegra_gpio_writel(bank->wake_enb[p],
352 GPIO_INT_ENB(gpio));
353 }
354 }
355 local_irq_restore(flags);
356 return 0;
357}
358
359static int tegra_gpio_irq_set_wake(struct irq_data *d, unsigned int enable)
360{
361 struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d);
362 int gpio = d->hwirq;
363 u32 port, bit, mask;
364
365 port = GPIO_PORT(gpio);
366 bit = GPIO_BIT(gpio);
367 mask = BIT(bit);
368
369 if (enable)
370 bank->wake_enb[port] |= mask;
371 else
372 bank->wake_enb[port] &= ~mask;
373
374 return irq_set_irq_wake(bank->irq, enable);
375}
376#endif
377
378#ifdef CONFIG_DEBUG_FS
379
380#include <linux/debugfs.h>
381#include <linux/seq_file.h>
382
383static int dbg_gpio_show(struct seq_file *s, void *unused)
384{
385 int i;
386 int j;
387
388 for (i = 0; i < tegra_gpio_bank_count; i++) {
389 for (j = 0; j < 4; j++) {
390 int gpio = tegra_gpio_compose(i, j, 0);
391 seq_printf(s,
392 "%d:%d %02x %02x %02x %02x %02x %02x %06x\n",
393 i, j,
394 tegra_gpio_readl(GPIO_CNF(gpio)),
395 tegra_gpio_readl(GPIO_OE(gpio)),
396 tegra_gpio_readl(GPIO_OUT(gpio)),
397 tegra_gpio_readl(GPIO_IN(gpio)),
398 tegra_gpio_readl(GPIO_INT_STA(gpio)),
399 tegra_gpio_readl(GPIO_INT_ENB(gpio)),
400 tegra_gpio_readl(GPIO_INT_LVL(gpio)));
401 }
402 }
403 return 0;
404}
405
406static int dbg_gpio_open(struct inode *inode, struct file *file)
407{
408 return single_open(file, dbg_gpio_show, &inode->i_private);
409}
410
411static const struct file_operations debug_fops = {
412 .open = dbg_gpio_open,
413 .read = seq_read,
414 .llseek = seq_lseek,
415 .release = single_release,
416};
417
418static void tegra_gpio_debuginit(void)
419{
420 (void) debugfs_create_file("tegra_gpio", S_IRUGO,
421 NULL, NULL, &debug_fops);
422}
423
424#else
425
426static inline void tegra_gpio_debuginit(void)
427{
428}
429
430#endif
431
432static struct irq_chip tegra_gpio_irq_chip = {
433 .name = "GPIO",
434 .irq_ack = tegra_gpio_irq_ack,
435 .irq_mask = tegra_gpio_irq_mask,
436 .irq_unmask = tegra_gpio_irq_unmask,
437 .irq_set_type = tegra_gpio_irq_set_type,
438 .irq_shutdown = tegra_gpio_irq_shutdown,
439#ifdef CONFIG_PM_SLEEP
440 .irq_set_wake = tegra_gpio_irq_set_wake,
441#endif
442};
443
444static const struct dev_pm_ops tegra_gpio_pm_ops = {
445 SET_SYSTEM_SLEEP_PM_OPS(tegra_gpio_suspend, tegra_gpio_resume)
446};
447
448struct tegra_gpio_soc_config {
449 u32 bank_stride;
450 u32 upper_offset;
451};
452
453static struct tegra_gpio_soc_config tegra20_gpio_config = {
454 .bank_stride = 0x80,
455 .upper_offset = 0x800,
456};
457
458static struct tegra_gpio_soc_config tegra30_gpio_config = {
459 .bank_stride = 0x100,
460 .upper_offset = 0x80,
461};
462
463static const struct of_device_id tegra_gpio_of_match[] = {
464 { .compatible = "nvidia,tegra30-gpio", .data = &tegra30_gpio_config },
465 { .compatible = "nvidia,tegra20-gpio", .data = &tegra20_gpio_config },
466 { },
467};
468
469/* This lock class tells lockdep that GPIO irqs are in a different
470 * category than their parents, so it won't report false recursion.
471 */
472static struct lock_class_key gpio_lock_class;
473
474static int tegra_gpio_probe(struct platform_device *pdev)
475{
476 const struct of_device_id *match;
477 struct tegra_gpio_soc_config *config;
478 struct resource *res;
479 struct tegra_gpio_bank *bank;
480 int ret;
481 int gpio;
482 int i;
483 int j;
484
485 dev = &pdev->dev;
486
487 match = of_match_device(tegra_gpio_of_match, &pdev->dev);
488 if (!match) {
489 dev_err(&pdev->dev, "Error: No device match found\n");
490 return -ENODEV;
491 }
492 config = (struct tegra_gpio_soc_config *)match->data;
493
494 tegra_gpio_bank_stride = config->bank_stride;
495 tegra_gpio_upper_offset = config->upper_offset;
496
497 for (;;) {
498 res = platform_get_resource(pdev, IORESOURCE_IRQ, tegra_gpio_bank_count);
499 if (!res)
500 break;
501 tegra_gpio_bank_count++;
502 }
503 if (!tegra_gpio_bank_count) {
504 dev_err(&pdev->dev, "Missing IRQ resource\n");
505 return -ENODEV;
506 }
507
508 tegra_gpio_chip.ngpio = tegra_gpio_bank_count * 32;
509
510 tegra_gpio_banks = devm_kzalloc(&pdev->dev,
511 tegra_gpio_bank_count * sizeof(*tegra_gpio_banks),
512 GFP_KERNEL);
513 if (!tegra_gpio_banks)
514 return -ENODEV;
515
516 irq_domain = irq_domain_add_linear(pdev->dev.of_node,
517 tegra_gpio_chip.ngpio,
518 &irq_domain_simple_ops, NULL);
519 if (!irq_domain)
520 return -ENODEV;
521
522 for (i = 0; i < tegra_gpio_bank_count; i++) {
523 res = platform_get_resource(pdev, IORESOURCE_IRQ, i);
524 if (!res) {
525 dev_err(&pdev->dev, "Missing IRQ resource\n");
526 return -ENODEV;
527 }
528
529 bank = &tegra_gpio_banks[i];
530 bank->bank = i;
531 bank->irq = res->start;
532 }
533
534 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
535 regs = devm_ioremap_resource(&pdev->dev, res);
536 if (IS_ERR(regs))
537 return PTR_ERR(regs);
538
539 for (i = 0; i < tegra_gpio_bank_count; i++) {
540 for (j = 0; j < 4; j++) {
541 int gpio = tegra_gpio_compose(i, j, 0);
542 tegra_gpio_writel(0x00, GPIO_INT_ENB(gpio));
543 }
544 }
545
546 tegra_gpio_chip.of_node = pdev->dev.of_node;
547
548 ret = devm_gpiochip_add_data(&pdev->dev, &tegra_gpio_chip, NULL);
549 if (ret < 0) {
550 irq_domain_remove(irq_domain);
551 return ret;
552 }
553
554 for (gpio = 0; gpio < tegra_gpio_chip.ngpio; gpio++) {
555 int irq = irq_create_mapping(irq_domain, gpio);
556 /* No validity check; all Tegra GPIOs are valid IRQs */
557
558 bank = &tegra_gpio_banks[GPIO_BANK(gpio)];
559
560 irq_set_lockdep_class(irq, &gpio_lock_class);
561 irq_set_chip_data(irq, bank);
562 irq_set_chip_and_handler(irq, &tegra_gpio_irq_chip,
563 handle_simple_irq);
564 }
565
566 for (i = 0; i < tegra_gpio_bank_count; i++) {
567 bank = &tegra_gpio_banks[i];
568
569 irq_set_chained_handler_and_data(bank->irq,
570 tegra_gpio_irq_handler, bank);
571
572 for (j = 0; j < 4; j++)
573 spin_lock_init(&bank->lvl_lock[j]);
574 }
575
576 tegra_gpio_debuginit();
577
578 return 0;
579}
580
581static struct platform_driver tegra_gpio_driver = {
582 .driver = {
583 .name = "tegra-gpio",
584 .pm = &tegra_gpio_pm_ops,
585 .of_match_table = tegra_gpio_of_match,
586 },
587 .probe = tegra_gpio_probe,
588};
589
590static int __init tegra_gpio_init(void)
591{
592 return platform_driver_register(&tegra_gpio_driver);
593}
594postcore_initcall(tegra_gpio_init);