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