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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_device.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 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 gpiochip_disable_irq(chip, gpio);
292}
293
294static void tegra_gpio_irq_unmask(struct irq_data *d)
295{
296 struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
297 struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
298 unsigned int gpio = d->hwirq;
299
300 gpiochip_enable_irq(chip, gpio);
301 tegra_gpio_mask_write(tgi, GPIO_MSK_INT_ENB(tgi, gpio), gpio, 1);
302}
303
304static int tegra_gpio_irq_set_type(struct irq_data *d, unsigned int type)
305{
306 unsigned int gpio = d->hwirq, port = GPIO_PORT(gpio), lvl_type;
307 struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
308 struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
309 struct tegra_gpio_bank *bank;
310 unsigned long flags;
311 int ret;
312 u32 val;
313
314 bank = &tgi->bank_info[GPIO_BANK(d->hwirq)];
315
316 switch (type & IRQ_TYPE_SENSE_MASK) {
317 case IRQ_TYPE_EDGE_RISING:
318 lvl_type = GPIO_INT_LVL_EDGE_RISING;
319 break;
320
321 case IRQ_TYPE_EDGE_FALLING:
322 lvl_type = GPIO_INT_LVL_EDGE_FALLING;
323 break;
324
325 case IRQ_TYPE_EDGE_BOTH:
326 lvl_type = GPIO_INT_LVL_EDGE_BOTH;
327 break;
328
329 case IRQ_TYPE_LEVEL_HIGH:
330 lvl_type = GPIO_INT_LVL_LEVEL_HIGH;
331 break;
332
333 case IRQ_TYPE_LEVEL_LOW:
334 lvl_type = GPIO_INT_LVL_LEVEL_LOW;
335 break;
336
337 default:
338 return -EINVAL;
339 }
340
341 raw_spin_lock_irqsave(&bank->lvl_lock[port], flags);
342
343 val = tegra_gpio_readl(tgi, GPIO_INT_LVL(tgi, gpio));
344 val &= ~(GPIO_INT_LVL_MASK << GPIO_BIT(gpio));
345 val |= lvl_type << GPIO_BIT(gpio);
346 tegra_gpio_writel(tgi, val, GPIO_INT_LVL(tgi, gpio));
347
348 raw_spin_unlock_irqrestore(&bank->lvl_lock[port], flags);
349
350 tegra_gpio_mask_write(tgi, GPIO_MSK_OE(tgi, gpio), gpio, 0);
351 tegra_gpio_enable(tgi, gpio);
352
353 ret = gpiochip_lock_as_irq(&tgi->gc, gpio);
354 if (ret) {
355 dev_err(tgi->dev,
356 "unable to lock Tegra GPIO %u as IRQ\n", gpio);
357 tegra_gpio_disable(tgi, gpio);
358 return ret;
359 }
360
361 if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
362 irq_set_handler_locked(d, handle_level_irq);
363 else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
364 irq_set_handler_locked(d, handle_edge_irq);
365
366 if (d->parent_data)
367 ret = irq_chip_set_type_parent(d, type);
368
369 return ret;
370}
371
372static void tegra_gpio_irq_shutdown(struct irq_data *d)
373{
374 struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
375 struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
376 unsigned int gpio = d->hwirq;
377
378 tegra_gpio_irq_mask(d);
379 gpiochip_unlock_as_irq(&tgi->gc, gpio);
380}
381
382static void tegra_gpio_irq_handler(struct irq_desc *desc)
383{
384 struct tegra_gpio_info *tgi = irq_desc_get_handler_data(desc);
385 struct irq_chip *chip = irq_desc_get_chip(desc);
386 struct irq_domain *domain = tgi->gc.irq.domain;
387 unsigned int irq = irq_desc_get_irq(desc);
388 struct tegra_gpio_bank *bank = NULL;
389 unsigned int port, pin, gpio, i;
390 bool unmasked = false;
391 unsigned long sta;
392 u32 lvl;
393
394 for (i = 0; i < tgi->bank_count; i++) {
395 if (tgi->irqs[i] == irq) {
396 bank = &tgi->bank_info[i];
397 break;
398 }
399 }
400
401 if (WARN_ON(bank == NULL))
402 return;
403
404 chained_irq_enter(chip, desc);
405
406 for (port = 0; port < 4; port++) {
407 gpio = tegra_gpio_compose(bank->bank, port, 0);
408 sta = tegra_gpio_readl(tgi, GPIO_INT_STA(tgi, gpio)) &
409 tegra_gpio_readl(tgi, GPIO_INT_ENB(tgi, gpio));
410 lvl = tegra_gpio_readl(tgi, GPIO_INT_LVL(tgi, gpio));
411
412 for_each_set_bit(pin, &sta, 8) {
413 int ret;
414
415 tegra_gpio_writel(tgi, 1 << pin,
416 GPIO_INT_CLR(tgi, gpio));
417
418 /* if gpio is edge triggered, clear condition
419 * before executing the handler so that we don't
420 * miss edges
421 */
422 if (!unmasked && lvl & (0x100 << pin)) {
423 unmasked = true;
424 chained_irq_exit(chip, desc);
425 }
426
427 ret = generic_handle_domain_irq(domain, gpio + pin);
428 WARN_RATELIMIT(ret, "hwirq = %d", gpio + pin);
429 }
430 }
431
432 if (!unmasked)
433 chained_irq_exit(chip, desc);
434}
435
436static int tegra_gpio_child_to_parent_hwirq(struct gpio_chip *chip,
437 unsigned int hwirq,
438 unsigned int type,
439 unsigned int *parent_hwirq,
440 unsigned int *parent_type)
441{
442 *parent_hwirq = chip->irq.child_offset_to_irq(chip, hwirq);
443 *parent_type = type;
444
445 return 0;
446}
447
448static int tegra_gpio_populate_parent_fwspec(struct gpio_chip *chip,
449 union gpio_irq_fwspec *gfwspec,
450 unsigned int parent_hwirq,
451 unsigned int parent_type)
452{
453 struct irq_fwspec *fwspec = &gfwspec->fwspec;
454
455 fwspec->fwnode = chip->irq.parent_domain->fwnode;
456 fwspec->param_count = 3;
457 fwspec->param[0] = 0;
458 fwspec->param[1] = parent_hwirq;
459 fwspec->param[2] = parent_type;
460
461 return 0;
462}
463
464#ifdef CONFIG_PM_SLEEP
465static int tegra_gpio_resume(struct device *dev)
466{
467 struct tegra_gpio_info *tgi = dev_get_drvdata(dev);
468 unsigned int b, p;
469
470 for (b = 0; b < tgi->bank_count; b++) {
471 struct tegra_gpio_bank *bank = &tgi->bank_info[b];
472
473 for (p = 0; p < ARRAY_SIZE(bank->oe); p++) {
474 unsigned int gpio = (b << 5) | (p << 3);
475
476 tegra_gpio_writel(tgi, bank->cnf[p],
477 GPIO_CNF(tgi, gpio));
478
479 if (tgi->soc->debounce_supported) {
480 tegra_gpio_writel(tgi, bank->dbc_cnt[p],
481 GPIO_DBC_CNT(tgi, gpio));
482 tegra_gpio_writel(tgi, bank->dbc_enb[p],
483 GPIO_MSK_DBC_EN(tgi, gpio));
484 }
485
486 tegra_gpio_writel(tgi, bank->out[p],
487 GPIO_OUT(tgi, gpio));
488 tegra_gpio_writel(tgi, bank->oe[p],
489 GPIO_OE(tgi, gpio));
490 tegra_gpio_writel(tgi, bank->int_lvl[p],
491 GPIO_INT_LVL(tgi, gpio));
492 tegra_gpio_writel(tgi, bank->int_enb[p],
493 GPIO_INT_ENB(tgi, gpio));
494 }
495 }
496
497 return 0;
498}
499
500static int tegra_gpio_suspend(struct device *dev)
501{
502 struct tegra_gpio_info *tgi = dev_get_drvdata(dev);
503 unsigned int b, p;
504
505 for (b = 0; b < tgi->bank_count; b++) {
506 struct tegra_gpio_bank *bank = &tgi->bank_info[b];
507
508 for (p = 0; p < ARRAY_SIZE(bank->oe); p++) {
509 unsigned int gpio = (b << 5) | (p << 3);
510
511 bank->cnf[p] = tegra_gpio_readl(tgi,
512 GPIO_CNF(tgi, gpio));
513 bank->out[p] = tegra_gpio_readl(tgi,
514 GPIO_OUT(tgi, gpio));
515 bank->oe[p] = tegra_gpio_readl(tgi,
516 GPIO_OE(tgi, gpio));
517 if (tgi->soc->debounce_supported) {
518 bank->dbc_enb[p] = tegra_gpio_readl(tgi,
519 GPIO_MSK_DBC_EN(tgi, gpio));
520 bank->dbc_enb[p] = (bank->dbc_enb[p] << 8) |
521 bank->dbc_enb[p];
522 }
523
524 bank->int_enb[p] = tegra_gpio_readl(tgi,
525 GPIO_INT_ENB(tgi, gpio));
526 bank->int_lvl[p] = tegra_gpio_readl(tgi,
527 GPIO_INT_LVL(tgi, gpio));
528
529 /* Enable gpio irq for wake up source */
530 tegra_gpio_writel(tgi, bank->wake_enb[p],
531 GPIO_INT_ENB(tgi, gpio));
532 }
533 }
534
535 return 0;
536}
537
538static int tegra_gpio_irq_set_wake(struct irq_data *d, unsigned int enable)
539{
540 struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
541 struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
542 struct tegra_gpio_bank *bank;
543 unsigned int gpio = d->hwirq;
544 u32 port, bit, mask;
545 int err;
546
547 bank = &tgi->bank_info[GPIO_BANK(d->hwirq)];
548
549 port = GPIO_PORT(gpio);
550 bit = GPIO_BIT(gpio);
551 mask = BIT(bit);
552
553 err = irq_set_irq_wake(tgi->irqs[bank->bank], enable);
554 if (err)
555 return err;
556
557 if (d->parent_data) {
558 err = irq_chip_set_wake_parent(d, enable);
559 if (err) {
560 irq_set_irq_wake(tgi->irqs[bank->bank], !enable);
561 return err;
562 }
563 }
564
565 if (enable)
566 bank->wake_enb[port] |= mask;
567 else
568 bank->wake_enb[port] &= ~mask;
569
570 return 0;
571}
572#endif
573
574static int tegra_gpio_irq_set_affinity(struct irq_data *data,
575 const struct cpumask *dest,
576 bool force)
577{
578 if (data->parent_data)
579 return irq_chip_set_affinity_parent(data, dest, force);
580
581 return -EINVAL;
582}
583
584static int tegra_gpio_irq_request_resources(struct irq_data *d)
585{
586 struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
587 struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
588
589 tegra_gpio_enable(tgi, d->hwirq);
590
591 return gpiochip_reqres_irq(chip, d->hwirq);
592}
593
594static void tegra_gpio_irq_release_resources(struct irq_data *d)
595{
596 struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
597 struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
598
599 gpiochip_relres_irq(chip, d->hwirq);
600 tegra_gpio_enable(tgi, d->hwirq);
601}
602
603static void tegra_gpio_irq_print_chip(struct irq_data *d, struct seq_file *s)
604{
605 struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
606
607 seq_printf(s, dev_name(chip->parent));
608}
609
610static const struct irq_chip tegra_gpio_irq_chip = {
611 .irq_shutdown = tegra_gpio_irq_shutdown,
612 .irq_ack = tegra_gpio_irq_ack,
613 .irq_mask = tegra_gpio_irq_mask,
614 .irq_unmask = tegra_gpio_irq_unmask,
615 .irq_set_type = tegra_gpio_irq_set_type,
616#ifdef CONFIG_PM_SLEEP
617 .irq_set_wake = tegra_gpio_irq_set_wake,
618#endif
619 .irq_print_chip = tegra_gpio_irq_print_chip,
620 .irq_request_resources = tegra_gpio_irq_request_resources,
621 .irq_release_resources = tegra_gpio_irq_release_resources,
622 .flags = IRQCHIP_IMMUTABLE,
623};
624
625static const struct irq_chip tegra210_gpio_irq_chip = {
626 .irq_shutdown = tegra_gpio_irq_shutdown,
627 .irq_ack = tegra_gpio_irq_ack,
628 .irq_mask = tegra_gpio_irq_mask,
629 .irq_unmask = tegra_gpio_irq_unmask,
630 .irq_set_affinity = tegra_gpio_irq_set_affinity,
631 .irq_set_type = tegra_gpio_irq_set_type,
632#ifdef CONFIG_PM_SLEEP
633 .irq_set_wake = tegra_gpio_irq_set_wake,
634#endif
635 .irq_print_chip = tegra_gpio_irq_print_chip,
636 .irq_request_resources = tegra_gpio_irq_request_resources,
637 .irq_release_resources = tegra_gpio_irq_release_resources,
638 .flags = IRQCHIP_IMMUTABLE,
639};
640
641#ifdef CONFIG_DEBUG_FS
642
643#include <linux/debugfs.h>
644
645static int tegra_dbg_gpio_show(struct seq_file *s, void *unused)
646{
647 struct tegra_gpio_info *tgi = dev_get_drvdata(s->private);
648 unsigned int i, j;
649
650 for (i = 0; i < tgi->bank_count; i++) {
651 for (j = 0; j < 4; j++) {
652 unsigned int gpio = tegra_gpio_compose(i, j, 0);
653
654 seq_printf(s,
655 "%u:%u %02x %02x %02x %02x %02x %02x %06x\n",
656 i, j,
657 tegra_gpio_readl(tgi, GPIO_CNF(tgi, gpio)),
658 tegra_gpio_readl(tgi, GPIO_OE(tgi, gpio)),
659 tegra_gpio_readl(tgi, GPIO_OUT(tgi, gpio)),
660 tegra_gpio_readl(tgi, GPIO_IN(tgi, gpio)),
661 tegra_gpio_readl(tgi, GPIO_INT_STA(tgi, gpio)),
662 tegra_gpio_readl(tgi, GPIO_INT_ENB(tgi, gpio)),
663 tegra_gpio_readl(tgi, GPIO_INT_LVL(tgi, gpio)));
664 }
665 }
666 return 0;
667}
668
669static void tegra_gpio_debuginit(struct tegra_gpio_info *tgi)
670{
671 debugfs_create_devm_seqfile(tgi->dev, "tegra_gpio", NULL,
672 tegra_dbg_gpio_show);
673}
674
675#else
676
677static inline void tegra_gpio_debuginit(struct tegra_gpio_info *tgi)
678{
679}
680
681#endif
682
683static const struct dev_pm_ops tegra_gpio_pm_ops = {
684 SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(tegra_gpio_suspend, tegra_gpio_resume)
685};
686
687static const struct of_device_id tegra_pmc_of_match[] = {
688 { .compatible = "nvidia,tegra210-pmc", },
689 { /* sentinel */ },
690};
691
692static int tegra_gpio_probe(struct platform_device *pdev)
693{
694 struct tegra_gpio_bank *bank;
695 struct tegra_gpio_info *tgi;
696 struct gpio_irq_chip *irq;
697 struct device_node *np;
698 unsigned int i, j;
699 int ret;
700
701 tgi = devm_kzalloc(&pdev->dev, sizeof(*tgi), GFP_KERNEL);
702 if (!tgi)
703 return -ENODEV;
704
705 tgi->soc = of_device_get_match_data(&pdev->dev);
706 tgi->dev = &pdev->dev;
707
708 ret = platform_irq_count(pdev);
709 if (ret < 0)
710 return ret;
711
712 tgi->bank_count = ret;
713
714 if (!tgi->bank_count) {
715 dev_err(&pdev->dev, "Missing IRQ resource\n");
716 return -ENODEV;
717 }
718
719 tgi->gc.label = "tegra-gpio";
720 tgi->gc.request = tegra_gpio_request;
721 tgi->gc.free = tegra_gpio_free;
722 tgi->gc.direction_input = tegra_gpio_direction_input;
723 tgi->gc.get = tegra_gpio_get;
724 tgi->gc.direction_output = tegra_gpio_direction_output;
725 tgi->gc.set = tegra_gpio_set;
726 tgi->gc.get_direction = tegra_gpio_get_direction;
727 tgi->gc.base = 0;
728 tgi->gc.ngpio = tgi->bank_count * 32;
729 tgi->gc.parent = &pdev->dev;
730
731 platform_set_drvdata(pdev, tgi);
732
733 if (tgi->soc->debounce_supported)
734 tgi->gc.set_config = tegra_gpio_set_config;
735
736 tgi->bank_info = devm_kcalloc(&pdev->dev, tgi->bank_count,
737 sizeof(*tgi->bank_info), GFP_KERNEL);
738 if (!tgi->bank_info)
739 return -ENOMEM;
740
741 tgi->irqs = devm_kcalloc(&pdev->dev, tgi->bank_count,
742 sizeof(*tgi->irqs), GFP_KERNEL);
743 if (!tgi->irqs)
744 return -ENOMEM;
745
746 for (i = 0; i < tgi->bank_count; i++) {
747 ret = platform_get_irq(pdev, i);
748 if (ret < 0)
749 return ret;
750
751 bank = &tgi->bank_info[i];
752 bank->bank = i;
753
754 tgi->irqs[i] = ret;
755
756 for (j = 0; j < 4; j++) {
757 raw_spin_lock_init(&bank->lvl_lock[j]);
758 spin_lock_init(&bank->dbc_lock[j]);
759 }
760 }
761
762 irq = &tgi->gc.irq;
763 irq->fwnode = of_node_to_fwnode(pdev->dev.of_node);
764 irq->child_to_parent_hwirq = tegra_gpio_child_to_parent_hwirq;
765 irq->populate_parent_alloc_arg = tegra_gpio_populate_parent_fwspec;
766 irq->handler = handle_simple_irq;
767 irq->default_type = IRQ_TYPE_NONE;
768 irq->parent_handler = tegra_gpio_irq_handler;
769 irq->parent_handler_data = tgi;
770 irq->num_parents = tgi->bank_count;
771 irq->parents = tgi->irqs;
772
773 np = of_find_matching_node(NULL, tegra_pmc_of_match);
774 if (np) {
775 irq->parent_domain = irq_find_host(np);
776 of_node_put(np);
777
778 if (!irq->parent_domain)
779 return -EPROBE_DEFER;
780
781 gpio_irq_chip_set_chip(irq, &tegra210_gpio_irq_chip);
782 } else {
783 gpio_irq_chip_set_chip(irq, &tegra_gpio_irq_chip);
784 }
785
786 tgi->regs = devm_platform_ioremap_resource(pdev, 0);
787 if (IS_ERR(tgi->regs))
788 return PTR_ERR(tgi->regs);
789
790 for (i = 0; i < tgi->bank_count; i++) {
791 for (j = 0; j < 4; j++) {
792 int gpio = tegra_gpio_compose(i, j, 0);
793
794 tegra_gpio_writel(tgi, 0x00, GPIO_INT_ENB(tgi, gpio));
795 }
796 }
797
798 ret = devm_gpiochip_add_data(&pdev->dev, &tgi->gc, tgi);
799 if (ret < 0)
800 return ret;
801
802 tegra_gpio_debuginit(tgi);
803
804 return 0;
805}
806
807static const struct tegra_gpio_soc_config tegra20_gpio_config = {
808 .bank_stride = 0x80,
809 .upper_offset = 0x800,
810};
811
812static const struct tegra_gpio_soc_config tegra30_gpio_config = {
813 .bank_stride = 0x100,
814 .upper_offset = 0x80,
815};
816
817static const struct tegra_gpio_soc_config tegra210_gpio_config = {
818 .debounce_supported = true,
819 .bank_stride = 0x100,
820 .upper_offset = 0x80,
821};
822
823static const struct of_device_id tegra_gpio_of_match[] = {
824 { .compatible = "nvidia,tegra210-gpio", .data = &tegra210_gpio_config },
825 { .compatible = "nvidia,tegra30-gpio", .data = &tegra30_gpio_config },
826 { .compatible = "nvidia,tegra20-gpio", .data = &tegra20_gpio_config },
827 { },
828};
829MODULE_DEVICE_TABLE(of, tegra_gpio_of_match);
830
831static struct platform_driver tegra_gpio_driver = {
832 .driver = {
833 .name = "tegra-gpio",
834 .pm = &tegra_gpio_pm_ops,
835 .of_match_table = tegra_gpio_of_match,
836 },
837 .probe = tegra_gpio_probe,
838};
839module_platform_driver(tegra_gpio_driver);
840
841MODULE_DESCRIPTION("NVIDIA Tegra GPIO controller driver");
842MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
843MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
844MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>");
845MODULE_AUTHOR("Erik Gilling <konkers@google.com>");
846MODULE_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(tgi, x) (GPIO_BANK(x) * tgi->soc->bank_stride + \
39 GPIO_PORT(x) * 4)
40
41#define GPIO_CNF(t, x) (GPIO_REG(t, x) + 0x00)
42#define GPIO_OE(t, x) (GPIO_REG(t, x) + 0x10)
43#define GPIO_OUT(t, x) (GPIO_REG(t, x) + 0X20)
44#define GPIO_IN(t, x) (GPIO_REG(t, x) + 0x30)
45#define GPIO_INT_STA(t, x) (GPIO_REG(t, x) + 0x40)
46#define GPIO_INT_ENB(t, x) (GPIO_REG(t, x) + 0x50)
47#define GPIO_INT_LVL(t, x) (GPIO_REG(t, x) + 0x60)
48#define GPIO_INT_CLR(t, x) (GPIO_REG(t, x) + 0x70)
49#define GPIO_DBC_CNT(t, x) (GPIO_REG(t, x) + 0xF0)
50
51
52#define GPIO_MSK_CNF(t, x) (GPIO_REG(t, x) + t->soc->upper_offset + 0x00)
53#define GPIO_MSK_OE(t, x) (GPIO_REG(t, x) + t->soc->upper_offset + 0x10)
54#define GPIO_MSK_OUT(t, x) (GPIO_REG(t, x) + t->soc->upper_offset + 0X20)
55#define GPIO_MSK_DBC_EN(t, x) (GPIO_REG(t, x) + t->soc->upper_offset + 0x30)
56#define GPIO_MSK_INT_STA(t, x) (GPIO_REG(t, x) + t->soc->upper_offset + 0x40)
57#define GPIO_MSK_INT_ENB(t, x) (GPIO_REG(t, x) + t->soc->upper_offset + 0x50)
58#define GPIO_MSK_INT_LVL(t, x) (GPIO_REG(t, x) + t->soc->upper_offset + 0x60)
59
60#define GPIO_INT_LVL_MASK 0x010101
61#define GPIO_INT_LVL_EDGE_RISING 0x000101
62#define GPIO_INT_LVL_EDGE_FALLING 0x000100
63#define GPIO_INT_LVL_EDGE_BOTH 0x010100
64#define GPIO_INT_LVL_LEVEL_HIGH 0x000001
65#define GPIO_INT_LVL_LEVEL_LOW 0x000000
66
67struct tegra_gpio_info;
68
69struct tegra_gpio_bank {
70 unsigned int bank;
71 unsigned int irq;
72 spinlock_t lvl_lock[4];
73 spinlock_t dbc_lock[4]; /* Lock for updating debounce count register */
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 struct tegra_gpio_info *tgi;
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 irq_domain *irq_domain;
97 struct tegra_gpio_bank *bank_info;
98 const struct tegra_gpio_soc_config *soc;
99 struct gpio_chip gc;
100 struct irq_chip ic;
101 u32 bank_count;
102};
103
104static inline void tegra_gpio_writel(struct tegra_gpio_info *tgi,
105 u32 val, u32 reg)
106{
107 __raw_writel(val, tgi->regs + reg);
108}
109
110static inline u32 tegra_gpio_readl(struct tegra_gpio_info *tgi, u32 reg)
111{
112 return __raw_readl(tgi->regs + reg);
113}
114
115static unsigned int tegra_gpio_compose(unsigned int bank, unsigned int port,
116 unsigned int bit)
117{
118 return (bank << 5) | ((port & 0x3) << 3) | (bit & 0x7);
119}
120
121static void tegra_gpio_mask_write(struct tegra_gpio_info *tgi, u32 reg,
122 unsigned int gpio, u32 value)
123{
124 u32 val;
125
126 val = 0x100 << GPIO_BIT(gpio);
127 if (value)
128 val |= 1 << GPIO_BIT(gpio);
129 tegra_gpio_writel(tgi, val, reg);
130}
131
132static void tegra_gpio_enable(struct tegra_gpio_info *tgi, unsigned int gpio)
133{
134 tegra_gpio_mask_write(tgi, GPIO_MSK_CNF(tgi, gpio), gpio, 1);
135}
136
137static void tegra_gpio_disable(struct tegra_gpio_info *tgi, unsigned int gpio)
138{
139 tegra_gpio_mask_write(tgi, GPIO_MSK_CNF(tgi, gpio), gpio, 0);
140}
141
142static int tegra_gpio_request(struct gpio_chip *chip, unsigned int offset)
143{
144 return pinctrl_gpio_request(offset);
145}
146
147static void tegra_gpio_free(struct gpio_chip *chip, unsigned int offset)
148{
149 struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
150
151 pinctrl_gpio_free(offset);
152 tegra_gpio_disable(tgi, offset);
153}
154
155static void tegra_gpio_set(struct gpio_chip *chip, unsigned int offset,
156 int value)
157{
158 struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
159
160 tegra_gpio_mask_write(tgi, GPIO_MSK_OUT(tgi, offset), offset, value);
161}
162
163static int tegra_gpio_get(struct gpio_chip *chip, unsigned int offset)
164{
165 struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
166 unsigned int bval = BIT(GPIO_BIT(offset));
167
168 /* If gpio is in output mode then read from the out value */
169 if (tegra_gpio_readl(tgi, GPIO_OE(tgi, offset)) & bval)
170 return !!(tegra_gpio_readl(tgi, GPIO_OUT(tgi, offset)) & bval);
171
172 return !!(tegra_gpio_readl(tgi, GPIO_IN(tgi, offset)) & bval);
173}
174
175static int tegra_gpio_direction_input(struct gpio_chip *chip,
176 unsigned int offset)
177{
178 struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
179
180 tegra_gpio_mask_write(tgi, GPIO_MSK_OE(tgi, offset), offset, 0);
181 tegra_gpio_enable(tgi, offset);
182 return 0;
183}
184
185static int tegra_gpio_direction_output(struct gpio_chip *chip,
186 unsigned int offset,
187 int value)
188{
189 struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
190
191 tegra_gpio_set(chip, offset, value);
192 tegra_gpio_mask_write(tgi, GPIO_MSK_OE(tgi, offset), offset, 1);
193 tegra_gpio_enable(tgi, offset);
194 return 0;
195}
196
197static int tegra_gpio_get_direction(struct gpio_chip *chip,
198 unsigned int offset)
199{
200 struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
201 u32 pin_mask = BIT(GPIO_BIT(offset));
202 u32 cnf, oe;
203
204 cnf = tegra_gpio_readl(tgi, GPIO_CNF(tgi, offset));
205 if (!(cnf & pin_mask))
206 return -EINVAL;
207
208 oe = tegra_gpio_readl(tgi, GPIO_OE(tgi, offset));
209
210 return (oe & pin_mask) ? GPIOF_DIR_OUT : GPIOF_DIR_IN;
211}
212
213static int tegra_gpio_set_debounce(struct gpio_chip *chip, unsigned int offset,
214 unsigned int debounce)
215{
216 struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
217 struct tegra_gpio_bank *bank = &tgi->bank_info[GPIO_BANK(offset)];
218 unsigned int debounce_ms = DIV_ROUND_UP(debounce, 1000);
219 unsigned long flags;
220 unsigned int port;
221
222 if (!debounce_ms) {
223 tegra_gpio_mask_write(tgi, GPIO_MSK_DBC_EN(tgi, offset),
224 offset, 0);
225 return 0;
226 }
227
228 debounce_ms = min(debounce_ms, 255U);
229 port = GPIO_PORT(offset);
230
231 /* There is only one debounce count register per port and hence
232 * set the maximum of current and requested debounce time.
233 */
234 spin_lock_irqsave(&bank->dbc_lock[port], flags);
235 if (bank->dbc_cnt[port] < debounce_ms) {
236 tegra_gpio_writel(tgi, debounce_ms, GPIO_DBC_CNT(tgi, offset));
237 bank->dbc_cnt[port] = debounce_ms;
238 }
239 spin_unlock_irqrestore(&bank->dbc_lock[port], flags);
240
241 tegra_gpio_mask_write(tgi, GPIO_MSK_DBC_EN(tgi, offset), offset, 1);
242
243 return 0;
244}
245
246static int tegra_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
247 unsigned long config)
248{
249 u32 debounce;
250
251 if (pinconf_to_config_param(config) != PIN_CONFIG_INPUT_DEBOUNCE)
252 return -ENOTSUPP;
253
254 debounce = pinconf_to_config_argument(config);
255 return tegra_gpio_set_debounce(chip, offset, debounce);
256}
257
258static int tegra_gpio_to_irq(struct gpio_chip *chip, unsigned int offset)
259{
260 struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
261
262 return irq_find_mapping(tgi->irq_domain, offset);
263}
264
265static void tegra_gpio_irq_ack(struct irq_data *d)
266{
267 struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d);
268 struct tegra_gpio_info *tgi = bank->tgi;
269 unsigned int gpio = d->hwirq;
270
271 tegra_gpio_writel(tgi, 1 << GPIO_BIT(gpio), GPIO_INT_CLR(tgi, gpio));
272}
273
274static void tegra_gpio_irq_mask(struct irq_data *d)
275{
276 struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d);
277 struct tegra_gpio_info *tgi = bank->tgi;
278 unsigned int gpio = d->hwirq;
279
280 tegra_gpio_mask_write(tgi, GPIO_MSK_INT_ENB(tgi, gpio), gpio, 0);
281}
282
283static void tegra_gpio_irq_unmask(struct irq_data *d)
284{
285 struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d);
286 struct tegra_gpio_info *tgi = bank->tgi;
287 unsigned int gpio = d->hwirq;
288
289 tegra_gpio_mask_write(tgi, GPIO_MSK_INT_ENB(tgi, gpio), gpio, 1);
290}
291
292static int tegra_gpio_irq_set_type(struct irq_data *d, unsigned int type)
293{
294 unsigned int gpio = d->hwirq, port = GPIO_PORT(gpio), lvl_type;
295 struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d);
296 struct tegra_gpio_info *tgi = bank->tgi;
297 unsigned long flags;
298 u32 val;
299 int ret;
300
301 switch (type & IRQ_TYPE_SENSE_MASK) {
302 case IRQ_TYPE_EDGE_RISING:
303 lvl_type = GPIO_INT_LVL_EDGE_RISING;
304 break;
305
306 case IRQ_TYPE_EDGE_FALLING:
307 lvl_type = GPIO_INT_LVL_EDGE_FALLING;
308 break;
309
310 case IRQ_TYPE_EDGE_BOTH:
311 lvl_type = GPIO_INT_LVL_EDGE_BOTH;
312 break;
313
314 case IRQ_TYPE_LEVEL_HIGH:
315 lvl_type = GPIO_INT_LVL_LEVEL_HIGH;
316 break;
317
318 case IRQ_TYPE_LEVEL_LOW:
319 lvl_type = GPIO_INT_LVL_LEVEL_LOW;
320 break;
321
322 default:
323 return -EINVAL;
324 }
325
326 ret = gpiochip_lock_as_irq(&tgi->gc, gpio);
327 if (ret) {
328 dev_err(tgi->dev,
329 "unable to lock Tegra GPIO %u as IRQ\n", gpio);
330 return ret;
331 }
332
333 spin_lock_irqsave(&bank->lvl_lock[port], flags);
334
335 val = tegra_gpio_readl(tgi, GPIO_INT_LVL(tgi, gpio));
336 val &= ~(GPIO_INT_LVL_MASK << GPIO_BIT(gpio));
337 val |= lvl_type << GPIO_BIT(gpio);
338 tegra_gpio_writel(tgi, val, GPIO_INT_LVL(tgi, gpio));
339
340 spin_unlock_irqrestore(&bank->lvl_lock[port], flags);
341
342 tegra_gpio_mask_write(tgi, GPIO_MSK_OE(tgi, gpio), gpio, 0);
343 tegra_gpio_enable(tgi, gpio);
344
345 if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
346 irq_set_handler_locked(d, handle_level_irq);
347 else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
348 irq_set_handler_locked(d, handle_edge_irq);
349
350 return 0;
351}
352
353static void tegra_gpio_irq_shutdown(struct irq_data *d)
354{
355 struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d);
356 struct tegra_gpio_info *tgi = bank->tgi;
357 unsigned int gpio = d->hwirq;
358
359 gpiochip_unlock_as_irq(&tgi->gc, gpio);
360}
361
362static void tegra_gpio_irq_handler(struct irq_desc *desc)
363{
364 unsigned int port, pin, gpio;
365 bool unmasked = false;
366 u32 lvl;
367 unsigned long sta;
368 struct irq_chip *chip = irq_desc_get_chip(desc);
369 struct tegra_gpio_bank *bank = irq_desc_get_handler_data(desc);
370 struct tegra_gpio_info *tgi = bank->tgi;
371
372 chained_irq_enter(chip, desc);
373
374 for (port = 0; port < 4; port++) {
375 gpio = tegra_gpio_compose(bank->bank, port, 0);
376 sta = tegra_gpio_readl(tgi, GPIO_INT_STA(tgi, gpio)) &
377 tegra_gpio_readl(tgi, GPIO_INT_ENB(tgi, gpio));
378 lvl = tegra_gpio_readl(tgi, GPIO_INT_LVL(tgi, gpio));
379
380 for_each_set_bit(pin, &sta, 8) {
381 tegra_gpio_writel(tgi, 1 << pin,
382 GPIO_INT_CLR(tgi, gpio));
383
384 /* if gpio is edge triggered, clear condition
385 * before executing the handler so that we don't
386 * miss edges
387 */
388 if (!unmasked && lvl & (0x100 << pin)) {
389 unmasked = true;
390 chained_irq_exit(chip, desc);
391 }
392
393 generic_handle_irq(irq_find_mapping(tgi->irq_domain,
394 gpio + pin));
395 }
396 }
397
398 if (!unmasked)
399 chained_irq_exit(chip, desc);
400
401}
402
403#ifdef CONFIG_PM_SLEEP
404static int tegra_gpio_resume(struct device *dev)
405{
406 struct platform_device *pdev = to_platform_device(dev);
407 struct tegra_gpio_info *tgi = platform_get_drvdata(pdev);
408 unsigned long flags;
409 unsigned int b, p;
410
411 local_irq_save(flags);
412
413 for (b = 0; b < tgi->bank_count; b++) {
414 struct tegra_gpio_bank *bank = &tgi->bank_info[b];
415
416 for (p = 0; p < ARRAY_SIZE(bank->oe); p++) {
417 unsigned int gpio = (b << 5) | (p << 3);
418
419 tegra_gpio_writel(tgi, bank->cnf[p],
420 GPIO_CNF(tgi, gpio));
421
422 if (tgi->soc->debounce_supported) {
423 tegra_gpio_writel(tgi, bank->dbc_cnt[p],
424 GPIO_DBC_CNT(tgi, gpio));
425 tegra_gpio_writel(tgi, bank->dbc_enb[p],
426 GPIO_MSK_DBC_EN(tgi, gpio));
427 }
428
429 tegra_gpio_writel(tgi, bank->out[p],
430 GPIO_OUT(tgi, gpio));
431 tegra_gpio_writel(tgi, bank->oe[p],
432 GPIO_OE(tgi, gpio));
433 tegra_gpio_writel(tgi, bank->int_lvl[p],
434 GPIO_INT_LVL(tgi, gpio));
435 tegra_gpio_writel(tgi, bank->int_enb[p],
436 GPIO_INT_ENB(tgi, gpio));
437 }
438 }
439
440 local_irq_restore(flags);
441 return 0;
442}
443
444static int tegra_gpio_suspend(struct device *dev)
445{
446 struct platform_device *pdev = to_platform_device(dev);
447 struct tegra_gpio_info *tgi = platform_get_drvdata(pdev);
448 unsigned long flags;
449 unsigned int b, p;
450
451 local_irq_save(flags);
452 for (b = 0; b < tgi->bank_count; b++) {
453 struct tegra_gpio_bank *bank = &tgi->bank_info[b];
454
455 for (p = 0; p < ARRAY_SIZE(bank->oe); p++) {
456 unsigned int gpio = (b << 5) | (p << 3);
457
458 bank->cnf[p] = tegra_gpio_readl(tgi,
459 GPIO_CNF(tgi, gpio));
460 bank->out[p] = tegra_gpio_readl(tgi,
461 GPIO_OUT(tgi, gpio));
462 bank->oe[p] = tegra_gpio_readl(tgi,
463 GPIO_OE(tgi, gpio));
464 if (tgi->soc->debounce_supported) {
465 bank->dbc_enb[p] = tegra_gpio_readl(tgi,
466 GPIO_MSK_DBC_EN(tgi, gpio));
467 bank->dbc_enb[p] = (bank->dbc_enb[p] << 8) |
468 bank->dbc_enb[p];
469 }
470
471 bank->int_enb[p] = tegra_gpio_readl(tgi,
472 GPIO_INT_ENB(tgi, gpio));
473 bank->int_lvl[p] = tegra_gpio_readl(tgi,
474 GPIO_INT_LVL(tgi, gpio));
475
476 /* Enable gpio irq for wake up source */
477 tegra_gpio_writel(tgi, bank->wake_enb[p],
478 GPIO_INT_ENB(tgi, gpio));
479 }
480 }
481 local_irq_restore(flags);
482 return 0;
483}
484
485static int tegra_gpio_irq_set_wake(struct irq_data *d, unsigned int enable)
486{
487 struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d);
488 unsigned int gpio = d->hwirq;
489 u32 port, bit, mask;
490
491 port = GPIO_PORT(gpio);
492 bit = GPIO_BIT(gpio);
493 mask = BIT(bit);
494
495 if (enable)
496 bank->wake_enb[port] |= mask;
497 else
498 bank->wake_enb[port] &= ~mask;
499
500 return irq_set_irq_wake(bank->irq, enable);
501}
502#endif
503
504#ifdef CONFIG_DEBUG_FS
505
506#include <linux/debugfs.h>
507#include <linux/seq_file.h>
508
509static int tegra_dbg_gpio_show(struct seq_file *s, void *unused)
510{
511 struct tegra_gpio_info *tgi = s->private;
512 unsigned int i, j;
513
514 for (i = 0; i < tgi->bank_count; i++) {
515 for (j = 0; j < 4; j++) {
516 unsigned int gpio = tegra_gpio_compose(i, j, 0);
517
518 seq_printf(s,
519 "%u:%u %02x %02x %02x %02x %02x %02x %06x\n",
520 i, j,
521 tegra_gpio_readl(tgi, GPIO_CNF(tgi, gpio)),
522 tegra_gpio_readl(tgi, GPIO_OE(tgi, gpio)),
523 tegra_gpio_readl(tgi, GPIO_OUT(tgi, gpio)),
524 tegra_gpio_readl(tgi, GPIO_IN(tgi, gpio)),
525 tegra_gpio_readl(tgi, GPIO_INT_STA(tgi, gpio)),
526 tegra_gpio_readl(tgi, GPIO_INT_ENB(tgi, gpio)),
527 tegra_gpio_readl(tgi, GPIO_INT_LVL(tgi, gpio)));
528 }
529 }
530 return 0;
531}
532
533DEFINE_SHOW_ATTRIBUTE(tegra_dbg_gpio);
534
535static void tegra_gpio_debuginit(struct tegra_gpio_info *tgi)
536{
537 (void) debugfs_create_file("tegra_gpio", 0444,
538 NULL, tgi, &tegra_dbg_gpio_fops);
539}
540
541#else
542
543static inline void tegra_gpio_debuginit(struct tegra_gpio_info *tgi)
544{
545}
546
547#endif
548
549static const struct dev_pm_ops tegra_gpio_pm_ops = {
550 SET_SYSTEM_SLEEP_PM_OPS(tegra_gpio_suspend, tegra_gpio_resume)
551};
552
553/*
554 * This lock class tells lockdep that GPIO irqs are in a different category
555 * than their parents, so it won't report false recursion.
556 */
557static struct lock_class_key gpio_lock_class;
558static struct lock_class_key gpio_request_class;
559
560static int tegra_gpio_probe(struct platform_device *pdev)
561{
562 struct tegra_gpio_info *tgi;
563 struct resource *res;
564 struct tegra_gpio_bank *bank;
565 unsigned int gpio, i, j;
566 int ret;
567
568 tgi = devm_kzalloc(&pdev->dev, sizeof(*tgi), GFP_KERNEL);
569 if (!tgi)
570 return -ENODEV;
571
572 tgi->soc = of_device_get_match_data(&pdev->dev);
573 tgi->dev = &pdev->dev;
574
575 ret = platform_irq_count(pdev);
576 if (ret < 0)
577 return ret;
578
579 tgi->bank_count = ret;
580
581 if (!tgi->bank_count) {
582 dev_err(&pdev->dev, "Missing IRQ resource\n");
583 return -ENODEV;
584 }
585
586 tgi->gc.label = "tegra-gpio";
587 tgi->gc.request = tegra_gpio_request;
588 tgi->gc.free = tegra_gpio_free;
589 tgi->gc.direction_input = tegra_gpio_direction_input;
590 tgi->gc.get = tegra_gpio_get;
591 tgi->gc.direction_output = tegra_gpio_direction_output;
592 tgi->gc.set = tegra_gpio_set;
593 tgi->gc.get_direction = tegra_gpio_get_direction;
594 tgi->gc.to_irq = tegra_gpio_to_irq;
595 tgi->gc.base = 0;
596 tgi->gc.ngpio = tgi->bank_count * 32;
597 tgi->gc.parent = &pdev->dev;
598 tgi->gc.of_node = pdev->dev.of_node;
599
600 tgi->ic.name = "GPIO";
601 tgi->ic.irq_ack = tegra_gpio_irq_ack;
602 tgi->ic.irq_mask = tegra_gpio_irq_mask;
603 tgi->ic.irq_unmask = tegra_gpio_irq_unmask;
604 tgi->ic.irq_set_type = tegra_gpio_irq_set_type;
605 tgi->ic.irq_shutdown = tegra_gpio_irq_shutdown;
606#ifdef CONFIG_PM_SLEEP
607 tgi->ic.irq_set_wake = tegra_gpio_irq_set_wake;
608#endif
609
610 platform_set_drvdata(pdev, tgi);
611
612 if (tgi->soc->debounce_supported)
613 tgi->gc.set_config = tegra_gpio_set_config;
614
615 tgi->bank_info = devm_kcalloc(&pdev->dev, tgi->bank_count,
616 sizeof(*tgi->bank_info), GFP_KERNEL);
617 if (!tgi->bank_info)
618 return -ENOMEM;
619
620 tgi->irq_domain = irq_domain_add_linear(pdev->dev.of_node,
621 tgi->gc.ngpio,
622 &irq_domain_simple_ops, NULL);
623 if (!tgi->irq_domain)
624 return -ENODEV;
625
626 for (i = 0; i < tgi->bank_count; i++) {
627 ret = platform_get_irq(pdev, i);
628 if (ret < 0) {
629 dev_err(&pdev->dev, "Missing IRQ resource: %d\n", ret);
630 return ret;
631 }
632
633 bank = &tgi->bank_info[i];
634 bank->bank = i;
635 bank->irq = ret;
636 bank->tgi = tgi;
637 }
638
639 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
640 tgi->regs = devm_ioremap_resource(&pdev->dev, res);
641 if (IS_ERR(tgi->regs))
642 return PTR_ERR(tgi->regs);
643
644 for (i = 0; i < tgi->bank_count; i++) {
645 for (j = 0; j < 4; j++) {
646 int gpio = tegra_gpio_compose(i, j, 0);
647
648 tegra_gpio_writel(tgi, 0x00, GPIO_INT_ENB(tgi, gpio));
649 }
650 }
651
652 ret = devm_gpiochip_add_data(&pdev->dev, &tgi->gc, tgi);
653 if (ret < 0) {
654 irq_domain_remove(tgi->irq_domain);
655 return ret;
656 }
657
658 for (gpio = 0; gpio < tgi->gc.ngpio; gpio++) {
659 int irq = irq_create_mapping(tgi->irq_domain, gpio);
660 /* No validity check; all Tegra GPIOs are valid IRQs */
661
662 bank = &tgi->bank_info[GPIO_BANK(gpio)];
663
664 irq_set_lockdep_class(irq, &gpio_lock_class,
665 &gpio_request_class);
666 irq_set_chip_data(irq, bank);
667 irq_set_chip_and_handler(irq, &tgi->ic, handle_simple_irq);
668 }
669
670 for (i = 0; i < tgi->bank_count; i++) {
671 bank = &tgi->bank_info[i];
672
673 irq_set_chained_handler_and_data(bank->irq,
674 tegra_gpio_irq_handler, bank);
675
676 for (j = 0; j < 4; j++) {
677 spin_lock_init(&bank->lvl_lock[j]);
678 spin_lock_init(&bank->dbc_lock[j]);
679 }
680 }
681
682 tegra_gpio_debuginit(tgi);
683
684 return 0;
685}
686
687static const struct tegra_gpio_soc_config tegra20_gpio_config = {
688 .bank_stride = 0x80,
689 .upper_offset = 0x800,
690};
691
692static const struct tegra_gpio_soc_config tegra30_gpio_config = {
693 .bank_stride = 0x100,
694 .upper_offset = 0x80,
695};
696
697static const struct tegra_gpio_soc_config tegra210_gpio_config = {
698 .debounce_supported = true,
699 .bank_stride = 0x100,
700 .upper_offset = 0x80,
701};
702
703static const struct of_device_id tegra_gpio_of_match[] = {
704 { .compatible = "nvidia,tegra210-gpio", .data = &tegra210_gpio_config },
705 { .compatible = "nvidia,tegra30-gpio", .data = &tegra30_gpio_config },
706 { .compatible = "nvidia,tegra20-gpio", .data = &tegra20_gpio_config },
707 { },
708};
709
710static struct platform_driver tegra_gpio_driver = {
711 .driver = {
712 .name = "tegra-gpio",
713 .pm = &tegra_gpio_pm_ops,
714 .of_match_table = tegra_gpio_of_match,
715 },
716 .probe = tegra_gpio_probe,
717};
718
719static int __init tegra_gpio_init(void)
720{
721 return platform_driver_register(&tegra_gpio_driver);
722}
723postcore_initcall(tegra_gpio_init);