1// SPDX-License-Identifier: GPL-2.0+
2//
3// S3C64xx specific support for pinctrl-samsung driver.
4//
5// Copyright (c) 2013 Tomasz Figa <tomasz.figa@gmail.com>
6//
7// Based on pinctrl-exynos.c, please see the file for original copyrights.
8//
9// This file contains the Samsung S3C64xx specific information required by the
10// the Samsung pinctrl/gpiolib driver. It also includes the implementation of
11// external gpio and wakeup interrupt support.
12
13#include <linux/init.h>
14#include <linux/device.h>
15#include <linux/interrupt.h>
16#include <linux/irqdomain.h>
17#include <linux/irq.h>
18#include <linux/of_irq.h>
19#include <linux/io.h>
20#include <linux/irqchip/chained_irq.h>
21#include <linux/slab.h>
22#include <linux/err.h>
23
24#include "pinctrl-samsung.h"
25
26#define NUM_EINT0 28
27#define NUM_EINT0_IRQ 4
28#define EINT_MAX_PER_REG 16
29#define EINT_MAX_PER_GROUP 16
30
31/* External GPIO and wakeup interrupt related definitions */
32#define SVC_GROUP_SHIFT 4
33#define SVC_GROUP_MASK 0xf
34#define SVC_NUM_MASK 0xf
35#define SVC_GROUP(x) ((x >> SVC_GROUP_SHIFT) & \
36 SVC_GROUP_MASK)
37
38#define EINT12CON_REG 0x200
39#define EINT12MASK_REG 0x240
40#define EINT12PEND_REG 0x260
41
42#define EINT_OFFS(i) ((i) % (2 * EINT_MAX_PER_GROUP))
43#define EINT_GROUP(i) ((i) / EINT_MAX_PER_GROUP)
44#define EINT_REG(g) (4 * ((g) / 2))
45
46#define EINTCON_REG(i) (EINT12CON_REG + EINT_REG(EINT_GROUP(i)))
47#define EINTMASK_REG(i) (EINT12MASK_REG + EINT_REG(EINT_GROUP(i)))
48#define EINTPEND_REG(i) (EINT12PEND_REG + EINT_REG(EINT_GROUP(i)))
49
50#define SERVICE_REG 0x284
51#define SERVICEPEND_REG 0x288
52
53#define EINT0CON0_REG 0x900
54#define EINT0MASK_REG 0x920
55#define EINT0PEND_REG 0x924
56
57/* S3C64xx specific external interrupt trigger types */
58#define EINT_LEVEL_LOW 0
59#define EINT_LEVEL_HIGH 1
60#define EINT_EDGE_FALLING 2
61#define EINT_EDGE_RISING 4
62#define EINT_EDGE_BOTH 6
63#define EINT_CON_MASK 0xF
64#define EINT_CON_LEN 4
65
66static const struct samsung_pin_bank_type bank_type_4bit_off = {
67 .fld_width = { 4, 1, 2, 0, 2, 2, },
68 .reg_offset = { 0x00, 0x04, 0x08, 0, 0x0c, 0x10, },
69};
70
71static const struct samsung_pin_bank_type bank_type_4bit_alive = {
72 .fld_width = { 4, 1, 2, },
73 .reg_offset = { 0x00, 0x04, 0x08, },
74};
75
76static const struct samsung_pin_bank_type bank_type_4bit2_off = {
77 .fld_width = { 4, 1, 2, 0, 2, 2, },
78 .reg_offset = { 0x00, 0x08, 0x0c, 0, 0x10, 0x14, },
79};
80
81static const struct samsung_pin_bank_type bank_type_4bit2_alive = {
82 .fld_width = { 4, 1, 2, },
83 .reg_offset = { 0x00, 0x08, 0x0c, },
84};
85
86static const struct samsung_pin_bank_type bank_type_2bit_off = {
87 .fld_width = { 2, 1, 2, 0, 2, 2, },
88 .reg_offset = { 0x00, 0x04, 0x08, 0, 0x0c, 0x10, },
89};
90
91static const struct samsung_pin_bank_type bank_type_2bit_alive = {
92 .fld_width = { 2, 1, 2, },
93 .reg_offset = { 0x00, 0x04, 0x08, },
94};
95
96#define PIN_BANK_4BIT(pins, reg, id) \
97 { \
98 .type = &bank_type_4bit_off, \
99 .pctl_offset = reg, \
100 .nr_pins = pins, \
101 .eint_type = EINT_TYPE_NONE, \
102 .name = id \
103 }
104
105#define PIN_BANK_4BIT_EINTG(pins, reg, id, eoffs) \
106 { \
107 .type = &bank_type_4bit_off, \
108 .pctl_offset = reg, \
109 .nr_pins = pins, \
110 .eint_type = EINT_TYPE_GPIO, \
111 .eint_func = 7, \
112 .eint_mask = (1 << (pins)) - 1, \
113 .eint_offset = eoffs, \
114 .name = id \
115 }
116
117#define PIN_BANK_4BIT_EINTW(pins, reg, id, eoffs, emask) \
118 { \
119 .type = &bank_type_4bit_alive,\
120 .pctl_offset = reg, \
121 .nr_pins = pins, \
122 .eint_type = EINT_TYPE_WKUP, \
123 .eint_func = 3, \
124 .eint_mask = emask, \
125 .eint_offset = eoffs, \
126 .name = id \
127 }
128
129#define PIN_BANK_4BIT2_EINTG(pins, reg, id, eoffs) \
130 { \
131 .type = &bank_type_4bit2_off, \
132 .pctl_offset = reg, \
133 .nr_pins = pins, \
134 .eint_type = EINT_TYPE_GPIO, \
135 .eint_func = 7, \
136 .eint_mask = (1 << (pins)) - 1, \
137 .eint_offset = eoffs, \
138 .name = id \
139 }
140
141#define PIN_BANK_4BIT2_EINTW(pins, reg, id, eoffs, emask) \
142 { \
143 .type = &bank_type_4bit2_alive,\
144 .pctl_offset = reg, \
145 .nr_pins = pins, \
146 .eint_type = EINT_TYPE_WKUP, \
147 .eint_func = 3, \
148 .eint_mask = emask, \
149 .eint_offset = eoffs, \
150 .name = id \
151 }
152
153#define PIN_BANK_4BIT2_ALIVE(pins, reg, id) \
154 { \
155 .type = &bank_type_4bit2_alive,\
156 .pctl_offset = reg, \
157 .nr_pins = pins, \
158 .eint_type = EINT_TYPE_NONE, \
159 .name = id \
160 }
161
162#define PIN_BANK_2BIT(pins, reg, id) \
163 { \
164 .type = &bank_type_2bit_off, \
165 .pctl_offset = reg, \
166 .nr_pins = pins, \
167 .eint_type = EINT_TYPE_NONE, \
168 .name = id \
169 }
170
171#define PIN_BANK_2BIT_EINTG(pins, reg, id, eoffs, emask) \
172 { \
173 .type = &bank_type_2bit_off, \
174 .pctl_offset = reg, \
175 .nr_pins = pins, \
176 .eint_type = EINT_TYPE_GPIO, \
177 .eint_func = 3, \
178 .eint_mask = emask, \
179 .eint_offset = eoffs, \
180 .name = id \
181 }
182
183#define PIN_BANK_2BIT_EINTW(pins, reg, id, eoffs) \
184 { \
185 .type = &bank_type_2bit_alive,\
186 .pctl_offset = reg, \
187 .nr_pins = pins, \
188 .eint_type = EINT_TYPE_WKUP, \
189 .eint_func = 2, \
190 .eint_mask = (1 << (pins)) - 1, \
191 .eint_offset = eoffs, \
192 .name = id \
193 }
194
195/**
196 * struct s3c64xx_eint0_data - EINT0 common data
197 * @drvdata: pin controller driver data
198 * @domains: IRQ domains of particular EINT0 interrupts
199 * @pins: pin offsets inside of banks of particular EINT0 interrupts
200 */
201struct s3c64xx_eint0_data {
202 struct samsung_pinctrl_drv_data *drvdata;
203 struct irq_domain *domains[NUM_EINT0];
204 u8 pins[NUM_EINT0];
205};
206
207/**
208 * struct s3c64xx_eint0_domain_data - EINT0 per-domain data
209 * @bank: pin bank related to the domain
210 * @eints: EINT0 interrupts related to the domain
211 */
212struct s3c64xx_eint0_domain_data {
213 struct samsung_pin_bank *bank;
214 u8 eints[];
215};
216
217/**
218 * struct s3c64xx_eint_gpio_data - GPIO EINT data
219 * @drvdata: pin controller driver data
220 * @domains: array of domains related to EINT interrupt groups
221 */
222struct s3c64xx_eint_gpio_data {
223 struct samsung_pinctrl_drv_data *drvdata;
224 struct irq_domain *domains[];
225};
226
227/*
228 * Common functions for S3C64xx EINT configuration
229 */
230
231static int s3c64xx_irq_get_trigger(unsigned int type)
232{
233 int trigger;
234
235 switch (type) {
236 case IRQ_TYPE_EDGE_RISING:
237 trigger = EINT_EDGE_RISING;
238 break;
239 case IRQ_TYPE_EDGE_FALLING:
240 trigger = EINT_EDGE_FALLING;
241 break;
242 case IRQ_TYPE_EDGE_BOTH:
243 trigger = EINT_EDGE_BOTH;
244 break;
245 case IRQ_TYPE_LEVEL_HIGH:
246 trigger = EINT_LEVEL_HIGH;
247 break;
248 case IRQ_TYPE_LEVEL_LOW:
249 trigger = EINT_LEVEL_LOW;
250 break;
251 default:
252 return -EINVAL;
253 }
254
255 return trigger;
256}
257
258static void s3c64xx_irq_set_handler(struct irq_data *d, unsigned int type)
259{
260 /* Edge- and level-triggered interrupts need different handlers */
261 if (type & IRQ_TYPE_EDGE_BOTH)
262 irq_set_handler_locked(data: d, handler: handle_edge_irq);
263 else
264 irq_set_handler_locked(data: d, handler: handle_level_irq);
265}
266
267static void s3c64xx_irq_set_function(struct samsung_pinctrl_drv_data *d,
268 struct samsung_pin_bank *bank, int pin)
269{
270 const struct samsung_pin_bank_type *bank_type = bank->type;
271 unsigned long flags;
272 void __iomem *reg;
273 u8 shift;
274 u32 mask;
275 u32 val;
276
277 /* Make sure that pin is configured as interrupt */
278 reg = d->virt_base + bank->pctl_offset;
279 shift = pin;
280 if (bank_type->fld_width[PINCFG_TYPE_FUNC] * shift >= 32) {
281 /* 4-bit bank type with 2 con regs */
282 reg += 4;
283 shift -= 8;
284 }
285
286 shift = shift * bank_type->fld_width[PINCFG_TYPE_FUNC];
287 mask = (1 << bank_type->fld_width[PINCFG_TYPE_FUNC]) - 1;
288
289 raw_spin_lock_irqsave(&bank->slock, flags);
290
291 val = readl(addr: reg);
292 val &= ~(mask << shift);
293 val |= bank->eint_func << shift;
294 writel(val, addr: reg);
295
296 raw_spin_unlock_irqrestore(&bank->slock, flags);
297}
298
299/*
300 * Functions for EINT GPIO configuration (EINT groups 1-9)
301 */
302
303static inline void s3c64xx_gpio_irq_set_mask(struct irq_data *irqd, bool mask)
304{
305 struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(d: irqd);
306 struct samsung_pinctrl_drv_data *d = bank->drvdata;
307 unsigned char index = EINT_OFFS(bank->eint_offset) + irqd->hwirq;
308 void __iomem *reg = d->virt_base + EINTMASK_REG(bank->eint_offset);
309 u32 val;
310
311 val = readl(addr: reg);
312 if (mask)
313 val |= 1 << index;
314 else
315 val &= ~(1 << index);
316 writel(val, addr: reg);
317}
318
319static void s3c64xx_gpio_irq_unmask(struct irq_data *irqd)
320{
321 s3c64xx_gpio_irq_set_mask(irqd, mask: false);
322}
323
324static void s3c64xx_gpio_irq_mask(struct irq_data *irqd)
325{
326 s3c64xx_gpio_irq_set_mask(irqd, mask: true);
327}
328
329static void s3c64xx_gpio_irq_ack(struct irq_data *irqd)
330{
331 struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(d: irqd);
332 struct samsung_pinctrl_drv_data *d = bank->drvdata;
333 unsigned char index = EINT_OFFS(bank->eint_offset) + irqd->hwirq;
334 void __iomem *reg = d->virt_base + EINTPEND_REG(bank->eint_offset);
335
336 writel(val: 1 << index, addr: reg);
337}
338
339static int s3c64xx_gpio_irq_set_type(struct irq_data *irqd, unsigned int type)
340{
341 struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(d: irqd);
342 struct samsung_pinctrl_drv_data *d = bank->drvdata;
343 void __iomem *reg;
344 int trigger;
345 u8 shift;
346 u32 val;
347
348 trigger = s3c64xx_irq_get_trigger(type);
349 if (trigger < 0) {
350 pr_err("unsupported external interrupt type\n");
351 return -EINVAL;
352 }
353
354 s3c64xx_irq_set_handler(d: irqd, type);
355
356 /* Set up interrupt trigger */
357 reg = d->virt_base + EINTCON_REG(bank->eint_offset);
358 shift = EINT_OFFS(bank->eint_offset) + irqd->hwirq;
359 shift = 4 * (shift / 4); /* 4 EINTs per trigger selector */
360
361 val = readl(addr: reg);
362 val &= ~(EINT_CON_MASK << shift);
363 val |= trigger << shift;
364 writel(val, addr: reg);
365
366 s3c64xx_irq_set_function(d, bank, pin: irqd->hwirq);
367
368 return 0;
369}
370
371/*
372 * irq_chip for gpio interrupts.
373 */
374static struct irq_chip s3c64xx_gpio_irq_chip = {
375 .name = "GPIO",
376 .irq_unmask = s3c64xx_gpio_irq_unmask,
377 .irq_mask = s3c64xx_gpio_irq_mask,
378 .irq_ack = s3c64xx_gpio_irq_ack,
379 .irq_set_type = s3c64xx_gpio_irq_set_type,
380};
381
382static int s3c64xx_gpio_irq_map(struct irq_domain *h, unsigned int virq,
383 irq_hw_number_t hw)
384{
385 struct samsung_pin_bank *bank = h->host_data;
386
387 if (!(bank->eint_mask & (1 << hw)))
388 return -EINVAL;
389
390 irq_set_chip_and_handler(irq: virq,
391 chip: &s3c64xx_gpio_irq_chip, handle: handle_level_irq);
392 irq_set_chip_data(irq: virq, data: bank);
393
394 return 0;
395}
396
397/*
398 * irq domain callbacks for external gpio interrupt controller.
399 */
400static const struct irq_domain_ops s3c64xx_gpio_irqd_ops = {
401 .map = s3c64xx_gpio_irq_map,
402 .xlate = irq_domain_xlate_twocell,
403};
404
405static void s3c64xx_eint_gpio_irq(struct irq_desc *desc)
406{
407 struct irq_chip *chip = irq_desc_get_chip(desc);
408 struct s3c64xx_eint_gpio_data *data = irq_desc_get_handler_data(desc);
409 struct samsung_pinctrl_drv_data *drvdata = data->drvdata;
410
411 chained_irq_enter(chip, desc);
412
413 do {
414 unsigned int svc;
415 unsigned int group;
416 unsigned int pin;
417 int ret;
418
419 svc = readl(addr: drvdata->virt_base + SERVICE_REG);
420 group = SVC_GROUP(svc);
421 pin = svc & SVC_NUM_MASK;
422
423 if (!group)
424 break;
425
426 /* Group 1 is used for two pin banks */
427 if (group == 1) {
428 if (pin < 8)
429 group = 0;
430 else
431 pin -= 8;
432 }
433
434 ret = generic_handle_domain_irq(domain: data->domains[group], hwirq: pin);
435 /*
436 * Something must be really wrong if an unmapped EINT
437 * was unmasked...
438 */
439 BUG_ON(ret);
440 } while (1);
441
442 chained_irq_exit(chip, desc);
443}
444
445/**
446 * s3c64xx_eint_gpio_init() - setup handling of external gpio interrupts.
447 * @d: driver data of samsung pinctrl driver.
448 */
449static int s3c64xx_eint_gpio_init(struct samsung_pinctrl_drv_data *d)
450{
451 struct s3c64xx_eint_gpio_data *data;
452 struct samsung_pin_bank *bank;
453 struct device *dev = d->dev;
454 unsigned int nr_domains;
455 unsigned int i;
456
457 if (!d->irq) {
458 dev_err(dev, "irq number not available\n");
459 return -EINVAL;
460 }
461
462 nr_domains = 0;
463 bank = d->pin_banks;
464 for (i = 0; i < d->nr_banks; ++i, ++bank) {
465 unsigned int nr_eints;
466 unsigned int mask;
467
468 if (bank->eint_type != EINT_TYPE_GPIO)
469 continue;
470
471 mask = bank->eint_mask;
472 nr_eints = fls(x: mask);
473
474 bank->irq_domain = irq_domain_create_linear(fwnode: bank->fwnode,
475 size: nr_eints, ops: &s3c64xx_gpio_irqd_ops, host_data: bank);
476 if (!bank->irq_domain) {
477 dev_err(dev, "gpio irq domain add failed\n");
478 return -ENXIO;
479 }
480
481 ++nr_domains;
482 }
483
484 data = devm_kzalloc(dev, struct_size(data, domains, nr_domains),
485 GFP_KERNEL);
486 if (!data)
487 return -ENOMEM;
488 data->drvdata = d;
489
490 bank = d->pin_banks;
491 nr_domains = 0;
492 for (i = 0; i < d->nr_banks; ++i, ++bank) {
493 if (bank->eint_type != EINT_TYPE_GPIO)
494 continue;
495
496 data->domains[nr_domains++] = bank->irq_domain;
497 }
498
499 irq_set_chained_handler_and_data(irq: d->irq, handle: s3c64xx_eint_gpio_irq, data);
500
501 return 0;
502}
503
504/*
505 * Functions for configuration of EINT0 wake-up interrupts
506 */
507
508static inline void s3c64xx_eint0_irq_set_mask(struct irq_data *irqd, bool mask)
509{
510 struct s3c64xx_eint0_domain_data *ddata =
511 irq_data_get_irq_chip_data(d: irqd);
512 struct samsung_pinctrl_drv_data *d = ddata->bank->drvdata;
513 u32 val;
514
515 val = readl(addr: d->virt_base + EINT0MASK_REG);
516 if (mask)
517 val |= 1 << ddata->eints[irqd->hwirq];
518 else
519 val &= ~(1 << ddata->eints[irqd->hwirq]);
520 writel(val, addr: d->virt_base + EINT0MASK_REG);
521}
522
523static void s3c64xx_eint0_irq_unmask(struct irq_data *irqd)
524{
525 s3c64xx_eint0_irq_set_mask(irqd, mask: false);
526}
527
528static void s3c64xx_eint0_irq_mask(struct irq_data *irqd)
529{
530 s3c64xx_eint0_irq_set_mask(irqd, mask: true);
531}
532
533static void s3c64xx_eint0_irq_ack(struct irq_data *irqd)
534{
535 struct s3c64xx_eint0_domain_data *ddata =
536 irq_data_get_irq_chip_data(d: irqd);
537 struct samsung_pinctrl_drv_data *d = ddata->bank->drvdata;
538
539 writel(val: 1 << ddata->eints[irqd->hwirq],
540 addr: d->virt_base + EINT0PEND_REG);
541}
542
543static int s3c64xx_eint0_irq_set_type(struct irq_data *irqd, unsigned int type)
544{
545 struct s3c64xx_eint0_domain_data *ddata =
546 irq_data_get_irq_chip_data(d: irqd);
547 struct samsung_pin_bank *bank = ddata->bank;
548 struct samsung_pinctrl_drv_data *d = bank->drvdata;
549 void __iomem *reg;
550 int trigger;
551 u8 shift;
552 u32 val;
553
554 trigger = s3c64xx_irq_get_trigger(type);
555 if (trigger < 0) {
556 pr_err("unsupported external interrupt type\n");
557 return -EINVAL;
558 }
559
560 s3c64xx_irq_set_handler(d: irqd, type);
561
562 /* Set up interrupt trigger */
563 reg = d->virt_base + EINT0CON0_REG;
564 shift = ddata->eints[irqd->hwirq];
565 if (shift >= EINT_MAX_PER_REG) {
566 reg += 4;
567 shift -= EINT_MAX_PER_REG;
568 }
569 shift = EINT_CON_LEN * (shift / 2);
570
571 val = readl(addr: reg);
572 val &= ~(EINT_CON_MASK << shift);
573 val |= trigger << shift;
574 writel(val, addr: reg);
575
576 s3c64xx_irq_set_function(d, bank, pin: irqd->hwirq);
577
578 return 0;
579}
580
581/*
582 * irq_chip for wakeup interrupts
583 */
584static struct irq_chip s3c64xx_eint0_irq_chip = {
585 .name = "EINT0",
586 .irq_unmask = s3c64xx_eint0_irq_unmask,
587 .irq_mask = s3c64xx_eint0_irq_mask,
588 .irq_ack = s3c64xx_eint0_irq_ack,
589 .irq_set_type = s3c64xx_eint0_irq_set_type,
590};
591
592static inline void s3c64xx_irq_demux_eint(struct irq_desc *desc, u32 range)
593{
594 struct irq_chip *chip = irq_desc_get_chip(desc);
595 struct s3c64xx_eint0_data *data = irq_desc_get_handler_data(desc);
596 struct samsung_pinctrl_drv_data *drvdata = data->drvdata;
597 unsigned int pend, mask;
598
599 chained_irq_enter(chip, desc);
600
601 pend = readl(addr: drvdata->virt_base + EINT0PEND_REG);
602 mask = readl(addr: drvdata->virt_base + EINT0MASK_REG);
603
604 pend = pend & range & ~mask;
605 pend &= range;
606
607 while (pend) {
608 unsigned int irq;
609 int ret;
610
611 irq = fls(x: pend) - 1;
612 pend &= ~(1 << irq);
613 ret = generic_handle_domain_irq(domain: data->domains[irq], hwirq: data->pins[irq]);
614 /*
615 * Something must be really wrong if an unmapped EINT
616 * was unmasked...
617 */
618 BUG_ON(ret);
619 }
620
621 chained_irq_exit(chip, desc);
622}
623
624static void s3c64xx_demux_eint0_3(struct irq_desc *desc)
625{
626 s3c64xx_irq_demux_eint(desc, range: 0xf);
627}
628
629static void s3c64xx_demux_eint4_11(struct irq_desc *desc)
630{
631 s3c64xx_irq_demux_eint(desc, range: 0xff0);
632}
633
634static void s3c64xx_demux_eint12_19(struct irq_desc *desc)
635{
636 s3c64xx_irq_demux_eint(desc, range: 0xff000);
637}
638
639static void s3c64xx_demux_eint20_27(struct irq_desc *desc)
640{
641 s3c64xx_irq_demux_eint(desc, range: 0xff00000);
642}
643
644static irq_flow_handler_t s3c64xx_eint0_handlers[NUM_EINT0_IRQ] = {
645 s3c64xx_demux_eint0_3,
646 s3c64xx_demux_eint4_11,
647 s3c64xx_demux_eint12_19,
648 s3c64xx_demux_eint20_27,
649};
650
651static int s3c64xx_eint0_irq_map(struct irq_domain *h, unsigned int virq,
652 irq_hw_number_t hw)
653{
654 struct s3c64xx_eint0_domain_data *ddata = h->host_data;
655 struct samsung_pin_bank *bank = ddata->bank;
656
657 if (!(bank->eint_mask & (1 << hw)))
658 return -EINVAL;
659
660 irq_set_chip_and_handler(irq: virq,
661 chip: &s3c64xx_eint0_irq_chip, handle: handle_level_irq);
662 irq_set_chip_data(irq: virq, data: ddata);
663
664 return 0;
665}
666
667/*
668 * irq domain callbacks for external wakeup interrupt controller.
669 */
670static const struct irq_domain_ops s3c64xx_eint0_irqd_ops = {
671 .map = s3c64xx_eint0_irq_map,
672 .xlate = irq_domain_xlate_twocell,
673};
674
675/* list of external wakeup controllers supported */
676static const struct of_device_id s3c64xx_eint0_irq_ids[] = {
677 { .compatible = "samsung,s3c64xx-wakeup-eint", },
678 { }
679};
680
681/**
682 * s3c64xx_eint_eint0_init() - setup handling of external wakeup interrupts.
683 * @d: driver data of samsung pinctrl driver.
684 */
685static int s3c64xx_eint_eint0_init(struct samsung_pinctrl_drv_data *d)
686{
687 struct device *dev = d->dev;
688 struct device_node *eint0_np = NULL;
689 struct device_node *np;
690 struct samsung_pin_bank *bank;
691 struct s3c64xx_eint0_data *data;
692 unsigned int i;
693
694 for_each_child_of_node(dev->of_node, np) {
695 if (of_match_node(matches: s3c64xx_eint0_irq_ids, node: np)) {
696 eint0_np = np;
697 break;
698 }
699 }
700 if (!eint0_np)
701 return -ENODEV;
702
703 data = devm_kzalloc(dev, size: sizeof(*data), GFP_KERNEL);
704 if (!data) {
705 of_node_put(node: eint0_np);
706 return -ENOMEM;
707 }
708 data->drvdata = d;
709
710 for (i = 0; i < NUM_EINT0_IRQ; ++i) {
711 unsigned int irq;
712
713 irq = irq_of_parse_and_map(node: eint0_np, index: i);
714 if (!irq) {
715 dev_err(dev, "failed to get wakeup EINT IRQ %d\n", i);
716 of_node_put(node: eint0_np);
717 return -ENXIO;
718 }
719
720 irq_set_chained_handler_and_data(irq,
721 handle: s3c64xx_eint0_handlers[i],
722 data);
723 }
724 of_node_put(node: eint0_np);
725
726 bank = d->pin_banks;
727 for (i = 0; i < d->nr_banks; ++i, ++bank) {
728 struct s3c64xx_eint0_domain_data *ddata;
729 unsigned int nr_eints;
730 unsigned int mask;
731 unsigned int irq;
732 unsigned int pin;
733
734 if (bank->eint_type != EINT_TYPE_WKUP)
735 continue;
736
737 mask = bank->eint_mask;
738 nr_eints = fls(x: mask);
739
740 ddata = devm_kzalloc(dev,
741 size: sizeof(*ddata) + nr_eints, GFP_KERNEL);
742 if (!ddata)
743 return -ENOMEM;
744 ddata->bank = bank;
745
746 bank->irq_domain = irq_domain_create_linear(fwnode: bank->fwnode,
747 size: nr_eints, ops: &s3c64xx_eint0_irqd_ops, host_data: ddata);
748 if (!bank->irq_domain) {
749 dev_err(dev, "wkup irq domain add failed\n");
750 return -ENXIO;
751 }
752
753 irq = bank->eint_offset;
754 mask = bank->eint_mask;
755 for (pin = 0; mask; ++pin, mask >>= 1) {
756 if (!(mask & 1))
757 continue;
758 data->domains[irq] = bank->irq_domain;
759 data->pins[irq] = pin;
760 ddata->eints[pin] = irq;
761 ++irq;
762 }
763 }
764
765 return 0;
766}
767
768/* pin banks of s3c64xx pin-controller 0 */
769static const struct samsung_pin_bank_data s3c64xx_pin_banks0[] __initconst = {
770 PIN_BANK_4BIT_EINTG(8, 0x000, "gpa", 0),
771 PIN_BANK_4BIT_EINTG(7, 0x020, "gpb", 8),
772 PIN_BANK_4BIT_EINTG(8, 0x040, "gpc", 16),
773 PIN_BANK_4BIT_EINTG(5, 0x060, "gpd", 32),
774 PIN_BANK_4BIT(5, 0x080, "gpe"),
775 PIN_BANK_2BIT_EINTG(16, 0x0a0, "gpf", 48, 0x3fff),
776 PIN_BANK_4BIT_EINTG(7, 0x0c0, "gpg", 64),
777 PIN_BANK_4BIT2_EINTG(10, 0x0e0, "gph", 80),
778 PIN_BANK_2BIT(16, 0x100, "gpi"),
779 PIN_BANK_2BIT(12, 0x120, "gpj"),
780 PIN_BANK_4BIT2_ALIVE(16, 0x800, "gpk"),
781 PIN_BANK_4BIT2_EINTW(15, 0x810, "gpl", 16, 0x7f00),
782 PIN_BANK_4BIT_EINTW(6, 0x820, "gpm", 23, 0x1f),
783 PIN_BANK_2BIT_EINTW(16, 0x830, "gpn", 0),
784 PIN_BANK_2BIT_EINTG(16, 0x140, "gpo", 96, 0xffff),
785 PIN_BANK_2BIT_EINTG(15, 0x160, "gpp", 112, 0x7fff),
786 PIN_BANK_2BIT_EINTG(9, 0x180, "gpq", 128, 0x1ff),
787};
788
789/*
790 * Samsung pinctrl driver data for S3C64xx SoC. S3C64xx SoC includes
791 * one gpio/pin-mux/pinconfig controller.
792 */
793static const struct samsung_pin_ctrl s3c64xx_pin_ctrl[] __initconst = {
794 {
795 /* pin-controller instance 1 data */
796 .pin_banks = s3c64xx_pin_banks0,
797 .nr_banks = ARRAY_SIZE(s3c64xx_pin_banks0),
798 .eint_gpio_init = s3c64xx_eint_gpio_init,
799 .eint_wkup_init = s3c64xx_eint_eint0_init,
800 },
801};
802
803const struct samsung_pinctrl_of_match_data s3c64xx_of_data __initconst = {
804 .ctrl = s3c64xx_pin_ctrl,
805 .num_ctrl = ARRAY_SIZE(s3c64xx_pin_ctrl),
806};
807

source code of linux/drivers/pinctrl/samsung/pinctrl-s3c64xx.c