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1/*
2 * arch/arm/mach-tegra/gpio.c
3 *
4 * Copyright (c) 2010 Google, Inc
5 *
6 * Author:
7 * Erik Gilling <konkers@google.com>
8 *
9 * This software is licensed under the terms of the GNU General Public
10 * License version 2, as published by the Free Software Foundation, and
11 * may be copied, distributed, and modified under those terms.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 */
19
20#include <linux/init.h>
21#include <linux/irq.h>
22#include <linux/interrupt.h>
23#include <linux/io.h>
24#include <linux/gpio.h>
25#include <linux/of_device.h>
26#include <linux/platform_device.h>
27#include <linux/module.h>
28#include <linux/irqdomain.h>
29#include <linux/pinctrl/consumer.h>
30
31#include <asm/mach/irq.h>
32
33#include <mach/iomap.h>
34#include <mach/suspend.h>
35
36#define GPIO_BANK(x) ((x) >> 5)
37#define GPIO_PORT(x) (((x) >> 3) & 0x3)
38#define GPIO_BIT(x) ((x) & 0x7)
39
40#define GPIO_REG(x) (GPIO_BANK(x) * tegra_gpio_bank_stride + \
41 GPIO_PORT(x) * 4)
42
43#define GPIO_CNF(x) (GPIO_REG(x) + 0x00)
44#define GPIO_OE(x) (GPIO_REG(x) + 0x10)
45#define GPIO_OUT(x) (GPIO_REG(x) + 0X20)
46#define GPIO_IN(x) (GPIO_REG(x) + 0x30)
47#define GPIO_INT_STA(x) (GPIO_REG(x) + 0x40)
48#define GPIO_INT_ENB(x) (GPIO_REG(x) + 0x50)
49#define GPIO_INT_LVL(x) (GPIO_REG(x) + 0x60)
50#define GPIO_INT_CLR(x) (GPIO_REG(x) + 0x70)
51
52#define GPIO_MSK_CNF(x) (GPIO_REG(x) + tegra_gpio_upper_offset + 0x00)
53#define GPIO_MSK_OE(x) (GPIO_REG(x) + tegra_gpio_upper_offset + 0x10)
54#define GPIO_MSK_OUT(x) (GPIO_REG(x) + tegra_gpio_upper_offset + 0X20)
55#define GPIO_MSK_INT_STA(x) (GPIO_REG(x) + tegra_gpio_upper_offset + 0x40)
56#define GPIO_MSK_INT_ENB(x) (GPIO_REG(x) + tegra_gpio_upper_offset + 0x50)
57#define GPIO_MSK_INT_LVL(x) (GPIO_REG(x) + tegra_gpio_upper_offset + 0x60)
58
59#define GPIO_INT_LVL_MASK 0x010101
60#define GPIO_INT_LVL_EDGE_RISING 0x000101
61#define GPIO_INT_LVL_EDGE_FALLING 0x000100
62#define GPIO_INT_LVL_EDGE_BOTH 0x010100
63#define GPIO_INT_LVL_LEVEL_HIGH 0x000001
64#define GPIO_INT_LVL_LEVEL_LOW 0x000000
65
66struct tegra_gpio_bank {
67 int bank;
68 int irq;
69 spinlock_t lvl_lock[4];
70#ifdef CONFIG_PM
71 u32 cnf[4];
72 u32 out[4];
73 u32 oe[4];
74 u32 int_enb[4];
75 u32 int_lvl[4];
76#endif
77};
78
79static struct irq_domain *irq_domain;
80static void __iomem *regs;
81static u32 tegra_gpio_bank_count;
82static u32 tegra_gpio_bank_stride;
83static u32 tegra_gpio_upper_offset;
84static struct tegra_gpio_bank *tegra_gpio_banks;
85
86static inline void tegra_gpio_writel(u32 val, u32 reg)
87{
88 __raw_writel(val, regs + reg);
89}
90
91static inline u32 tegra_gpio_readl(u32 reg)
92{
93 return __raw_readl(regs + reg);
94}
95
96static int tegra_gpio_compose(int bank, int port, int bit)
97{
98 return (bank << 5) | ((port & 0x3) << 3) | (bit & 0x7);
99}
100
101static void tegra_gpio_mask_write(u32 reg, int gpio, int value)
102{
103 u32 val;
104
105 val = 0x100 << GPIO_BIT(gpio);
106 if (value)
107 val |= 1 << GPIO_BIT(gpio);
108 tegra_gpio_writel(val, reg);
109}
110
111static void tegra_gpio_enable(int gpio)
112{
113 tegra_gpio_mask_write(GPIO_MSK_CNF(gpio), gpio, 1);
114}
115EXPORT_SYMBOL_GPL(tegra_gpio_enable);
116
117static void tegra_gpio_disable(int gpio)
118{
119 tegra_gpio_mask_write(GPIO_MSK_CNF(gpio), gpio, 0);
120}
121EXPORT_SYMBOL_GPL(tegra_gpio_disable);
122
123int tegra_gpio_request(struct gpio_chip *chip, unsigned offset)
124{
125 return pinctrl_request_gpio(offset);
126}
127
128void tegra_gpio_free(struct gpio_chip *chip, unsigned offset)
129{
130 pinctrl_free_gpio(offset);
131 tegra_gpio_disable(offset);
132}
133
134static void tegra_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
135{
136 tegra_gpio_mask_write(GPIO_MSK_OUT(offset), offset, value);
137}
138
139static int tegra_gpio_get(struct gpio_chip *chip, unsigned offset)
140{
141 return (tegra_gpio_readl(GPIO_IN(offset)) >> GPIO_BIT(offset)) & 0x1;
142}
143
144static int tegra_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
145{
146 tegra_gpio_mask_write(GPIO_MSK_OE(offset), offset, 0);
147 tegra_gpio_enable(offset);
148 return 0;
149}
150
151static int tegra_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
152 int value)
153{
154 tegra_gpio_set(chip, offset, value);
155 tegra_gpio_mask_write(GPIO_MSK_OE(offset), offset, 1);
156 tegra_gpio_enable(offset);
157 return 0;
158}
159
160static int tegra_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
161{
162 return irq_find_mapping(irq_domain, offset);
163}
164
165static struct gpio_chip tegra_gpio_chip = {
166 .label = "tegra-gpio",
167 .request = tegra_gpio_request,
168 .free = tegra_gpio_free,
169 .direction_input = tegra_gpio_direction_input,
170 .get = tegra_gpio_get,
171 .direction_output = tegra_gpio_direction_output,
172 .set = tegra_gpio_set,
173 .to_irq = tegra_gpio_to_irq,
174 .base = 0,
175};
176
177static void tegra_gpio_irq_ack(struct irq_data *d)
178{
179 int gpio = d->hwirq;
180
181 tegra_gpio_writel(1 << GPIO_BIT(gpio), GPIO_INT_CLR(gpio));
182}
183
184static void tegra_gpio_irq_mask(struct irq_data *d)
185{
186 int gpio = d->hwirq;
187
188 tegra_gpio_mask_write(GPIO_MSK_INT_ENB(gpio), gpio, 0);
189}
190
191static void tegra_gpio_irq_unmask(struct irq_data *d)
192{
193 int gpio = d->hwirq;
194
195 tegra_gpio_mask_write(GPIO_MSK_INT_ENB(gpio), gpio, 1);
196}
197
198static int tegra_gpio_irq_set_type(struct irq_data *d, unsigned int type)
199{
200 int gpio = d->hwirq;
201 struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d);
202 int port = GPIO_PORT(gpio);
203 int lvl_type;
204 int val;
205 unsigned long flags;
206
207 switch (type & IRQ_TYPE_SENSE_MASK) {
208 case IRQ_TYPE_EDGE_RISING:
209 lvl_type = GPIO_INT_LVL_EDGE_RISING;
210 break;
211
212 case IRQ_TYPE_EDGE_FALLING:
213 lvl_type = GPIO_INT_LVL_EDGE_FALLING;
214 break;
215
216 case IRQ_TYPE_EDGE_BOTH:
217 lvl_type = GPIO_INT_LVL_EDGE_BOTH;
218 break;
219
220 case IRQ_TYPE_LEVEL_HIGH:
221 lvl_type = GPIO_INT_LVL_LEVEL_HIGH;
222 break;
223
224 case IRQ_TYPE_LEVEL_LOW:
225 lvl_type = GPIO_INT_LVL_LEVEL_LOW;
226 break;
227
228 default:
229 return -EINVAL;
230 }
231
232 spin_lock_irqsave(&bank->lvl_lock[port], flags);
233
234 val = tegra_gpio_readl(GPIO_INT_LVL(gpio));
235 val &= ~(GPIO_INT_LVL_MASK << GPIO_BIT(gpio));
236 val |= lvl_type << GPIO_BIT(gpio);
237 tegra_gpio_writel(val, GPIO_INT_LVL(gpio));
238
239 spin_unlock_irqrestore(&bank->lvl_lock[port], flags);
240
241 tegra_gpio_mask_write(GPIO_MSK_OE(gpio), gpio, 0);
242 tegra_gpio_enable(gpio);
243
244 if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
245 __irq_set_handler_locked(d->irq, handle_level_irq);
246 else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
247 __irq_set_handler_locked(d->irq, handle_edge_irq);
248
249 return 0;
250}
251
252static void tegra_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
253{
254 struct tegra_gpio_bank *bank;
255 int port;
256 int pin;
257 int unmasked = 0;
258 struct irq_chip *chip = irq_desc_get_chip(desc);
259
260 chained_irq_enter(chip, desc);
261
262 bank = irq_get_handler_data(irq);
263
264 for (port = 0; port < 4; port++) {
265 int gpio = tegra_gpio_compose(bank->bank, port, 0);
266 unsigned long sta = tegra_gpio_readl(GPIO_INT_STA(gpio)) &
267 tegra_gpio_readl(GPIO_INT_ENB(gpio));
268 u32 lvl = tegra_gpio_readl(GPIO_INT_LVL(gpio));
269
270 for_each_set_bit(pin, &sta, 8) {
271 tegra_gpio_writel(1 << pin, GPIO_INT_CLR(gpio));
272
273 /* if gpio is edge triggered, clear condition
274 * before executing the hander so that we don't
275 * miss edges
276 */
277 if (lvl & (0x100 << pin)) {
278 unmasked = 1;
279 chained_irq_exit(chip, desc);
280 }
281
282 generic_handle_irq(gpio_to_irq(gpio + pin));
283 }
284 }
285
286 if (!unmasked)
287 chained_irq_exit(chip, desc);
288
289}
290
291#ifdef CONFIG_PM
292void tegra_gpio_resume(void)
293{
294 unsigned long flags;
295 int b;
296 int p;
297
298 local_irq_save(flags);
299
300 for (b = 0; b < tegra_gpio_bank_count; b++) {
301 struct tegra_gpio_bank *bank = &tegra_gpio_banks[b];
302
303 for (p = 0; p < ARRAY_SIZE(bank->oe); p++) {
304 unsigned int gpio = (b<<5) | (p<<3);
305 tegra_gpio_writel(bank->cnf[p], GPIO_CNF(gpio));
306 tegra_gpio_writel(bank->out[p], GPIO_OUT(gpio));
307 tegra_gpio_writel(bank->oe[p], GPIO_OE(gpio));
308 tegra_gpio_writel(bank->int_lvl[p], GPIO_INT_LVL(gpio));
309 tegra_gpio_writel(bank->int_enb[p], GPIO_INT_ENB(gpio));
310 }
311 }
312
313 local_irq_restore(flags);
314}
315
316void tegra_gpio_suspend(void)
317{
318 unsigned long flags;
319 int b;
320 int p;
321
322 local_irq_save(flags);
323 for (b = 0; b < tegra_gpio_bank_count; b++) {
324 struct tegra_gpio_bank *bank = &tegra_gpio_banks[b];
325
326 for (p = 0; p < ARRAY_SIZE(bank->oe); p++) {
327 unsigned int gpio = (b<<5) | (p<<3);
328 bank->cnf[p] = tegra_gpio_readl(GPIO_CNF(gpio));
329 bank->out[p] = tegra_gpio_readl(GPIO_OUT(gpio));
330 bank->oe[p] = tegra_gpio_readl(GPIO_OE(gpio));
331 bank->int_enb[p] = tegra_gpio_readl(GPIO_INT_ENB(gpio));
332 bank->int_lvl[p] = tegra_gpio_readl(GPIO_INT_LVL(gpio));
333 }
334 }
335 local_irq_restore(flags);
336}
337
338static int tegra_gpio_wake_enable(struct irq_data *d, unsigned int enable)
339{
340 struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d);
341 return irq_set_irq_wake(bank->irq, enable);
342}
343#endif
344
345static struct irq_chip tegra_gpio_irq_chip = {
346 .name = "GPIO",
347 .irq_ack = tegra_gpio_irq_ack,
348 .irq_mask = tegra_gpio_irq_mask,
349 .irq_unmask = tegra_gpio_irq_unmask,
350 .irq_set_type = tegra_gpio_irq_set_type,
351#ifdef CONFIG_PM
352 .irq_set_wake = tegra_gpio_wake_enable,
353#endif
354};
355
356struct tegra_gpio_soc_config {
357 u32 bank_stride;
358 u32 upper_offset;
359};
360
361static struct tegra_gpio_soc_config tegra20_gpio_config = {
362 .bank_stride = 0x80,
363 .upper_offset = 0x800,
364};
365
366static struct tegra_gpio_soc_config tegra30_gpio_config = {
367 .bank_stride = 0x100,
368 .upper_offset = 0x80,
369};
370
371static struct of_device_id tegra_gpio_of_match[] __devinitdata = {
372 { .compatible = "nvidia,tegra30-gpio", .data = &tegra30_gpio_config },
373 { .compatible = "nvidia,tegra20-gpio", .data = &tegra20_gpio_config },
374 { },
375};
376
377/* This lock class tells lockdep that GPIO irqs are in a different
378 * category than their parents, so it won't report false recursion.
379 */
380static struct lock_class_key gpio_lock_class;
381
382static int __devinit tegra_gpio_probe(struct platform_device *pdev)
383{
384 const struct of_device_id *match;
385 struct tegra_gpio_soc_config *config;
386 int irq_base;
387 struct resource *res;
388 struct tegra_gpio_bank *bank;
389 int gpio;
390 int i;
391 int j;
392
393 match = of_match_device(tegra_gpio_of_match, &pdev->dev);
394 if (match)
395 config = (struct tegra_gpio_soc_config *)match->data;
396 else
397 config = &tegra20_gpio_config;
398
399 tegra_gpio_bank_stride = config->bank_stride;
400 tegra_gpio_upper_offset = config->upper_offset;
401
402 for (;;) {
403 res = platform_get_resource(pdev, IORESOURCE_IRQ, tegra_gpio_bank_count);
404 if (!res)
405 break;
406 tegra_gpio_bank_count++;
407 }
408 if (!tegra_gpio_bank_count) {
409 dev_err(&pdev->dev, "Missing IRQ resource\n");
410 return -ENODEV;
411 }
412
413 tegra_gpio_chip.ngpio = tegra_gpio_bank_count * 32;
414
415 tegra_gpio_banks = devm_kzalloc(&pdev->dev,
416 tegra_gpio_bank_count * sizeof(*tegra_gpio_banks),
417 GFP_KERNEL);
418 if (!tegra_gpio_banks) {
419 dev_err(&pdev->dev, "Couldn't allocate bank structure\n");
420 return -ENODEV;
421 }
422
423 irq_base = irq_alloc_descs(-1, 0, tegra_gpio_chip.ngpio, 0);
424 if (irq_base < 0) {
425 dev_err(&pdev->dev, "Couldn't allocate IRQ numbers\n");
426 return -ENODEV;
427 }
428 irq_domain = irq_domain_add_legacy(pdev->dev.of_node,
429 tegra_gpio_chip.ngpio, irq_base, 0,
430 &irq_domain_simple_ops, NULL);
431
432 for (i = 0; i < tegra_gpio_bank_count; i++) {
433 res = platform_get_resource(pdev, IORESOURCE_IRQ, i);
434 if (!res) {
435 dev_err(&pdev->dev, "Missing IRQ resource\n");
436 return -ENODEV;
437 }
438
439 bank = &tegra_gpio_banks[i];
440 bank->bank = i;
441 bank->irq = res->start;
442 }
443
444 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
445 if (!res) {
446 dev_err(&pdev->dev, "Missing MEM resource\n");
447 return -ENODEV;
448 }
449
450 regs = devm_request_and_ioremap(&pdev->dev, res);
451 if (!regs) {
452 dev_err(&pdev->dev, "Couldn't ioremap regs\n");
453 return -ENODEV;
454 }
455
456 for (i = 0; i < tegra_gpio_bank_count; i++) {
457 for (j = 0; j < 4; j++) {
458 int gpio = tegra_gpio_compose(i, j, 0);
459 tegra_gpio_writel(0x00, GPIO_INT_ENB(gpio));
460 }
461 }
462
463#ifdef CONFIG_OF_GPIO
464 tegra_gpio_chip.of_node = pdev->dev.of_node;
465#endif
466
467 gpiochip_add(&tegra_gpio_chip);
468
469 for (gpio = 0; gpio < tegra_gpio_chip.ngpio; gpio++) {
470 int irq = irq_find_mapping(irq_domain, gpio);
471 /* No validity check; all Tegra GPIOs are valid IRQs */
472
473 bank = &tegra_gpio_banks[GPIO_BANK(gpio)];
474
475 irq_set_lockdep_class(irq, &gpio_lock_class);
476 irq_set_chip_data(irq, bank);
477 irq_set_chip_and_handler(irq, &tegra_gpio_irq_chip,
478 handle_simple_irq);
479 set_irq_flags(irq, IRQF_VALID);
480 }
481
482 for (i = 0; i < tegra_gpio_bank_count; i++) {
483 bank = &tegra_gpio_banks[i];
484
485 irq_set_chained_handler(bank->irq, tegra_gpio_irq_handler);
486 irq_set_handler_data(bank->irq, bank);
487
488 for (j = 0; j < 4; j++)
489 spin_lock_init(&bank->lvl_lock[j]);
490 }
491
492 return 0;
493}
494
495static struct platform_driver tegra_gpio_driver = {
496 .driver = {
497 .name = "tegra-gpio",
498 .owner = THIS_MODULE,
499 .of_match_table = tegra_gpio_of_match,
500 },
501 .probe = tegra_gpio_probe,
502};
503
504static int __init tegra_gpio_init(void)
505{
506 return platform_driver_register(&tegra_gpio_driver);
507}
508postcore_initcall(tegra_gpio_init);
509
510#ifdef CONFIG_DEBUG_FS
511
512#include <linux/debugfs.h>
513#include <linux/seq_file.h>
514
515static int dbg_gpio_show(struct seq_file *s, void *unused)
516{
517 int i;
518 int j;
519
520 for (i = 0; i < tegra_gpio_bank_count; i++) {
521 for (j = 0; j < 4; j++) {
522 int gpio = tegra_gpio_compose(i, j, 0);
523 seq_printf(s,
524 "%d:%d %02x %02x %02x %02x %02x %02x %06x\n",
525 i, j,
526 tegra_gpio_readl(GPIO_CNF(gpio)),
527 tegra_gpio_readl(GPIO_OE(gpio)),
528 tegra_gpio_readl(GPIO_OUT(gpio)),
529 tegra_gpio_readl(GPIO_IN(gpio)),
530 tegra_gpio_readl(GPIO_INT_STA(gpio)),
531 tegra_gpio_readl(GPIO_INT_ENB(gpio)),
532 tegra_gpio_readl(GPIO_INT_LVL(gpio)));
533 }
534 }
535 return 0;
536}
537
538static int dbg_gpio_open(struct inode *inode, struct file *file)
539{
540 return single_open(file, dbg_gpio_show, &inode->i_private);
541}
542
543static const struct file_operations debug_fops = {
544 .open = dbg_gpio_open,
545 .read = seq_read,
546 .llseek = seq_lseek,
547 .release = single_release,
548};
549
550static int __init tegra_gpio_debuginit(void)
551{
552 (void) debugfs_create_file("tegra_gpio", S_IRUGO,
553 NULL, NULL, &debug_fops);
554 return 0;
555}
556late_initcall(tegra_gpio_debuginit);
557#endif
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");