1 // SPDX-License-Identifier: GPL-2.0+
2 //
3 // Exynos specific support for Samsung pinctrl/gpiolib driver with eint support.
4 //
5 // Copyright (c) 2012 Samsung Electronics Co., Ltd.
6 // http://www.samsung.com
7 // Copyright (c) 2012 Linaro Ltd
8 // http://www.linaro.org
9 //
10 // Author: Thomas Abraham <thomas.ab@samsung.com>
11 //
12 // This file contains the Samsung Exynos specific information required by the
13 // the Samsung pinctrl/gpiolib driver. It also includes the implementation of
14 // external gpio and wakeup interrupt support.
15
16 #include <linux/device.h>
17 #include <linux/interrupt.h>
18 #include <linux/irqdomain.h>
19 #include <linux/irq.h>
20 #include <linux/irqchip/chained_irq.h>
21 #include <linux/of.h>
22 #include <linux/of_irq.h>
23 #include <linux/slab.h>
24 #include <linux/spinlock.h>
25 #include <linux/regmap.h>
26 #include <linux/err.h>
27 #include <linux/soc/samsung/exynos-pmu.h>
28 #include <linux/soc/samsung/exynos-regs-pmu.h>
29
30 #include <dt-bindings/pinctrl/samsung.h>
31
32 #include "pinctrl-samsung.h"
33 #include "pinctrl-exynos.h"
34
35 struct exynos_irq_chip {
36 struct irq_chip chip;
37
38 u32 eint_con;
39 u32 eint_mask;
40 u32 eint_pend;
41 u32 eint_wake_mask_value;
42 u32 eint_wake_mask_reg;
43 void (*set_eint_wakeup_mask)(struct samsung_pinctrl_drv_data *drvdata,
44 struct exynos_irq_chip *irq_chip);
45 };
46
to_exynos_irq_chip(struct irq_chip * chip)47 static inline struct exynos_irq_chip *to_exynos_irq_chip(struct irq_chip *chip)
48 {
49 return container_of(chip, struct exynos_irq_chip, chip);
50 }
51
exynos_irq_mask(struct irq_data * irqd)52 static void exynos_irq_mask(struct irq_data *irqd)
53 {
54 struct irq_chip *chip = irq_data_get_irq_chip(irqd);
55 struct exynos_irq_chip *our_chip = to_exynos_irq_chip(chip);
56 struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(irqd);
57 unsigned long reg_mask = our_chip->eint_mask + bank->eint_offset;
58 unsigned long mask;
59 unsigned long flags;
60
61 spin_lock_irqsave(&bank->slock, flags);
62
63 mask = readl(bank->eint_base + reg_mask);
64 mask |= 1 << irqd->hwirq;
65 writel(mask, bank->eint_base + reg_mask);
66
67 spin_unlock_irqrestore(&bank->slock, flags);
68 }
69
exynos_irq_ack(struct irq_data * irqd)70 static void exynos_irq_ack(struct irq_data *irqd)
71 {
72 struct irq_chip *chip = irq_data_get_irq_chip(irqd);
73 struct exynos_irq_chip *our_chip = to_exynos_irq_chip(chip);
74 struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(irqd);
75 unsigned long reg_pend = our_chip->eint_pend + bank->eint_offset;
76
77 writel(1 << irqd->hwirq, bank->eint_base + reg_pend);
78 }
79
exynos_irq_unmask(struct irq_data * irqd)80 static void exynos_irq_unmask(struct irq_data *irqd)
81 {
82 struct irq_chip *chip = irq_data_get_irq_chip(irqd);
83 struct exynos_irq_chip *our_chip = to_exynos_irq_chip(chip);
84 struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(irqd);
85 unsigned long reg_mask = our_chip->eint_mask + bank->eint_offset;
86 unsigned long mask;
87 unsigned long flags;
88
89 /*
90 * Ack level interrupts right before unmask
91 *
92 * If we don't do this we'll get a double-interrupt. Level triggered
93 * interrupts must not fire an interrupt if the level is not
94 * _currently_ active, even if it was active while the interrupt was
95 * masked.
96 */
97 if (irqd_get_trigger_type(irqd) & IRQ_TYPE_LEVEL_MASK)
98 exynos_irq_ack(irqd);
99
100 spin_lock_irqsave(&bank->slock, flags);
101
102 mask = readl(bank->eint_base + reg_mask);
103 mask &= ~(1 << irqd->hwirq);
104 writel(mask, bank->eint_base + reg_mask);
105
106 spin_unlock_irqrestore(&bank->slock, flags);
107 }
108
exynos_irq_set_type(struct irq_data * irqd,unsigned int type)109 static int exynos_irq_set_type(struct irq_data *irqd, unsigned int type)
110 {
111 struct irq_chip *chip = irq_data_get_irq_chip(irqd);
112 struct exynos_irq_chip *our_chip = to_exynos_irq_chip(chip);
113 struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(irqd);
114 unsigned int shift = EXYNOS_EINT_CON_LEN * irqd->hwirq;
115 unsigned int con, trig_type;
116 unsigned long reg_con = our_chip->eint_con + bank->eint_offset;
117
118 switch (type) {
119 case IRQ_TYPE_EDGE_RISING:
120 trig_type = EXYNOS_EINT_EDGE_RISING;
121 break;
122 case IRQ_TYPE_EDGE_FALLING:
123 trig_type = EXYNOS_EINT_EDGE_FALLING;
124 break;
125 case IRQ_TYPE_EDGE_BOTH:
126 trig_type = EXYNOS_EINT_EDGE_BOTH;
127 break;
128 case IRQ_TYPE_LEVEL_HIGH:
129 trig_type = EXYNOS_EINT_LEVEL_HIGH;
130 break;
131 case IRQ_TYPE_LEVEL_LOW:
132 trig_type = EXYNOS_EINT_LEVEL_LOW;
133 break;
134 default:
135 pr_err("unsupported external interrupt type\n");
136 return -EINVAL;
137 }
138
139 if (type & IRQ_TYPE_EDGE_BOTH)
140 irq_set_handler_locked(irqd, handle_edge_irq);
141 else
142 irq_set_handler_locked(irqd, handle_level_irq);
143
144 con = readl(bank->eint_base + reg_con);
145 con &= ~(EXYNOS_EINT_CON_MASK << shift);
146 con |= trig_type << shift;
147 writel(con, bank->eint_base + reg_con);
148
149 return 0;
150 }
151
exynos_irq_request_resources(struct irq_data * irqd)152 static int exynos_irq_request_resources(struct irq_data *irqd)
153 {
154 struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(irqd);
155 const struct samsung_pin_bank_type *bank_type = bank->type;
156 unsigned long reg_con, flags;
157 unsigned int shift, mask, con;
158 int ret;
159
160 ret = gpiochip_lock_as_irq(&bank->gpio_chip, irqd->hwirq);
161 if (ret) {
162 dev_err(bank->gpio_chip.parent,
163 "unable to lock pin %s-%lu IRQ\n",
164 bank->name, irqd->hwirq);
165 return ret;
166 }
167
168 reg_con = bank->pctl_offset + bank_type->reg_offset[PINCFG_TYPE_FUNC];
169 shift = irqd->hwirq * bank_type->fld_width[PINCFG_TYPE_FUNC];
170 mask = (1 << bank_type->fld_width[PINCFG_TYPE_FUNC]) - 1;
171
172 spin_lock_irqsave(&bank->slock, flags);
173
174 con = readl(bank->pctl_base + reg_con);
175 con &= ~(mask << shift);
176 con |= EXYNOS_PIN_FUNC_EINT << shift;
177 writel(con, bank->pctl_base + reg_con);
178
179 spin_unlock_irqrestore(&bank->slock, flags);
180
181 return 0;
182 }
183
exynos_irq_release_resources(struct irq_data * irqd)184 static void exynos_irq_release_resources(struct irq_data *irqd)
185 {
186 struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(irqd);
187 const struct samsung_pin_bank_type *bank_type = bank->type;
188 unsigned long reg_con, flags;
189 unsigned int shift, mask, con;
190
191 reg_con = bank->pctl_offset + bank_type->reg_offset[PINCFG_TYPE_FUNC];
192 shift = irqd->hwirq * bank_type->fld_width[PINCFG_TYPE_FUNC];
193 mask = (1 << bank_type->fld_width[PINCFG_TYPE_FUNC]) - 1;
194
195 spin_lock_irqsave(&bank->slock, flags);
196
197 con = readl(bank->pctl_base + reg_con);
198 con &= ~(mask << shift);
199 con |= EXYNOS_PIN_FUNC_INPUT << shift;
200 writel(con, bank->pctl_base + reg_con);
201
202 spin_unlock_irqrestore(&bank->slock, flags);
203
204 gpiochip_unlock_as_irq(&bank->gpio_chip, irqd->hwirq);
205 }
206
207 /*
208 * irq_chip for gpio interrupts.
209 */
210 static struct exynos_irq_chip exynos_gpio_irq_chip = {
211 .chip = {
212 .name = "exynos_gpio_irq_chip",
213 .irq_unmask = exynos_irq_unmask,
214 .irq_mask = exynos_irq_mask,
215 .irq_ack = exynos_irq_ack,
216 .irq_set_type = exynos_irq_set_type,
217 .irq_request_resources = exynos_irq_request_resources,
218 .irq_release_resources = exynos_irq_release_resources,
219 },
220 .eint_con = EXYNOS_GPIO_ECON_OFFSET,
221 .eint_mask = EXYNOS_GPIO_EMASK_OFFSET,
222 .eint_pend = EXYNOS_GPIO_EPEND_OFFSET,
223 /* eint_wake_mask_value not used */
224 };
225
exynos_eint_irq_map(struct irq_domain * h,unsigned int virq,irq_hw_number_t hw)226 static int exynos_eint_irq_map(struct irq_domain *h, unsigned int virq,
227 irq_hw_number_t hw)
228 {
229 struct samsung_pin_bank *b = h->host_data;
230
231 irq_set_chip_data(virq, b);
232 irq_set_chip_and_handler(virq, &b->irq_chip->chip,
233 handle_level_irq);
234 return 0;
235 }
236
237 /*
238 * irq domain callbacks for external gpio and wakeup interrupt controllers.
239 */
240 static const struct irq_domain_ops exynos_eint_irqd_ops = {
241 .map = exynos_eint_irq_map,
242 .xlate = irq_domain_xlate_twocell,
243 };
244
exynos_eint_gpio_irq(int irq,void * data)245 static irqreturn_t exynos_eint_gpio_irq(int irq, void *data)
246 {
247 struct samsung_pinctrl_drv_data *d = data;
248 struct samsung_pin_bank *bank = d->pin_banks;
249 unsigned int svc, group, pin, virq;
250
251 svc = readl(bank->eint_base + EXYNOS_SVC_OFFSET);
252 group = EXYNOS_SVC_GROUP(svc);
253 pin = svc & EXYNOS_SVC_NUM_MASK;
254
255 if (!group)
256 return IRQ_HANDLED;
257 bank += (group - 1);
258
259 virq = irq_linear_revmap(bank->irq_domain, pin);
260 if (!virq)
261 return IRQ_NONE;
262 generic_handle_irq(virq);
263 return IRQ_HANDLED;
264 }
265
266 struct exynos_eint_gpio_save {
267 u32 eint_con;
268 u32 eint_fltcon0;
269 u32 eint_fltcon1;
270 u32 eint_mask;
271 };
272
273 /*
274 * exynos_eint_gpio_init() - setup handling of external gpio interrupts.
275 * @d: driver data of samsung pinctrl driver.
276 */
exynos_eint_gpio_init(struct samsung_pinctrl_drv_data * d)277 int exynos_eint_gpio_init(struct samsung_pinctrl_drv_data *d)
278 {
279 struct samsung_pin_bank *bank;
280 struct device *dev = d->dev;
281 int ret;
282 int i;
283
284 if (!d->irq) {
285 dev_err(dev, "irq number not available\n");
286 return -EINVAL;
287 }
288
289 ret = devm_request_irq(dev, d->irq, exynos_eint_gpio_irq,
290 0, dev_name(dev), d);
291 if (ret) {
292 dev_err(dev, "irq request failed\n");
293 return -ENXIO;
294 }
295
296 bank = d->pin_banks;
297 for (i = 0; i < d->nr_banks; ++i, ++bank) {
298 if (bank->eint_type != EINT_TYPE_GPIO)
299 continue;
300 bank->irq_domain = irq_domain_add_linear(bank->of_node,
301 bank->nr_pins, &exynos_eint_irqd_ops, bank);
302 if (!bank->irq_domain) {
303 dev_err(dev, "gpio irq domain add failed\n");
304 ret = -ENXIO;
305 goto err_domains;
306 }
307
308 bank->soc_priv = devm_kzalloc(d->dev,
309 sizeof(struct exynos_eint_gpio_save), GFP_KERNEL);
310 if (!bank->soc_priv) {
311 irq_domain_remove(bank->irq_domain);
312 ret = -ENOMEM;
313 goto err_domains;
314 }
315
316 bank->irq_chip = &exynos_gpio_irq_chip;
317 }
318
319 return 0;
320
321 err_domains:
322 for (--i, --bank; i >= 0; --i, --bank) {
323 if (bank->eint_type != EINT_TYPE_GPIO)
324 continue;
325 irq_domain_remove(bank->irq_domain);
326 }
327
328 return ret;
329 }
330
331 static u32 exynos_eint_wake_mask = 0xffffffff;
332
exynos_get_eint_wake_mask(void)333 u32 exynos_get_eint_wake_mask(void)
334 {
335 return exynos_eint_wake_mask;
336 }
337
exynos_wkup_irq_set_wake(struct irq_data * irqd,unsigned int on)338 static int exynos_wkup_irq_set_wake(struct irq_data *irqd, unsigned int on)
339 {
340 struct irq_chip *chip = irq_data_get_irq_chip(irqd);
341 struct exynos_irq_chip *our_chip = to_exynos_irq_chip(chip);
342 struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(irqd);
343 unsigned long bit = 1UL << (2 * bank->eint_offset + irqd->hwirq);
344
345 pr_info("wake %s for irq %d\n", on ? "enabled" : "disabled", irqd->irq);
346
347 if (!on)
348 exynos_eint_wake_mask |= bit;
349 else
350 exynos_eint_wake_mask &= ~bit;
351 our_chip->eint_wake_mask_value = exynos_eint_wake_mask;
352
353 return 0;
354 }
355
356 static void
exynos_pinctrl_set_eint_wakeup_mask(struct samsung_pinctrl_drv_data * drvdata,struct exynos_irq_chip * irq_chip)357 exynos_pinctrl_set_eint_wakeup_mask(struct samsung_pinctrl_drv_data *drvdata,
358 struct exynos_irq_chip *irq_chip)
359 {
360 struct regmap *pmu_regs;
361
362 if (!drvdata->retention_ctrl || !drvdata->retention_ctrl->priv) {
363 dev_warn(drvdata->dev,
364 "No retention data configured bank with external wakeup interrupt. Wake-up mask will not be set.\n");
365 return;
366 }
367
368 pmu_regs = drvdata->retention_ctrl->priv;
369 dev_info(drvdata->dev,
370 "Setting external wakeup interrupt mask: 0x%x\n",
371 irq_chip->eint_wake_mask_value);
372
373 regmap_write(pmu_regs, irq_chip->eint_wake_mask_reg,
374 irq_chip->eint_wake_mask_value);
375 }
376
377 static void
s5pv210_pinctrl_set_eint_wakeup_mask(struct samsung_pinctrl_drv_data * drvdata,struct exynos_irq_chip * irq_chip)378 s5pv210_pinctrl_set_eint_wakeup_mask(struct samsung_pinctrl_drv_data *drvdata,
379 struct exynos_irq_chip *irq_chip)
380
381 {
382 void __iomem *clk_base;
383
384 if (!drvdata->retention_ctrl || !drvdata->retention_ctrl->priv) {
385 dev_warn(drvdata->dev,
386 "No retention data configured bank with external wakeup interrupt. Wake-up mask will not be set.\n");
387 return;
388 }
389
390
391 clk_base = (void __iomem *) drvdata->retention_ctrl->priv;
392
393 __raw_writel(irq_chip->eint_wake_mask_value,
394 clk_base + irq_chip->eint_wake_mask_reg);
395 }
396
397 /*
398 * irq_chip for wakeup interrupts
399 */
400 static const struct exynos_irq_chip s5pv210_wkup_irq_chip __initconst = {
401 .chip = {
402 .name = "s5pv210_wkup_irq_chip",
403 .irq_unmask = exynos_irq_unmask,
404 .irq_mask = exynos_irq_mask,
405 .irq_ack = exynos_irq_ack,
406 .irq_set_type = exynos_irq_set_type,
407 .irq_set_wake = exynos_wkup_irq_set_wake,
408 .irq_request_resources = exynos_irq_request_resources,
409 .irq_release_resources = exynos_irq_release_resources,
410 },
411 .eint_con = EXYNOS_WKUP_ECON_OFFSET,
412 .eint_mask = EXYNOS_WKUP_EMASK_OFFSET,
413 .eint_pend = EXYNOS_WKUP_EPEND_OFFSET,
414 .eint_wake_mask_value = EXYNOS_EINT_WAKEUP_MASK_DISABLED,
415 /* Only differences with exynos4210_wkup_irq_chip: */
416 .eint_wake_mask_reg = S5PV210_EINT_WAKEUP_MASK,
417 .set_eint_wakeup_mask = s5pv210_pinctrl_set_eint_wakeup_mask,
418 };
419
420 static const struct exynos_irq_chip exynos4210_wkup_irq_chip __initconst = {
421 .chip = {
422 .name = "exynos4210_wkup_irq_chip",
423 .irq_unmask = exynos_irq_unmask,
424 .irq_mask = exynos_irq_mask,
425 .irq_ack = exynos_irq_ack,
426 .irq_set_type = exynos_irq_set_type,
427 .irq_set_wake = exynos_wkup_irq_set_wake,
428 .irq_request_resources = exynos_irq_request_resources,
429 .irq_release_resources = exynos_irq_release_resources,
430 },
431 .eint_con = EXYNOS_WKUP_ECON_OFFSET,
432 .eint_mask = EXYNOS_WKUP_EMASK_OFFSET,
433 .eint_pend = EXYNOS_WKUP_EPEND_OFFSET,
434 .eint_wake_mask_value = EXYNOS_EINT_WAKEUP_MASK_DISABLED,
435 .eint_wake_mask_reg = EXYNOS_EINT_WAKEUP_MASK,
436 .set_eint_wakeup_mask = exynos_pinctrl_set_eint_wakeup_mask,
437 };
438
439 static const struct exynos_irq_chip exynos7_wkup_irq_chip __initconst = {
440 .chip = {
441 .name = "exynos7_wkup_irq_chip",
442 .irq_unmask = exynos_irq_unmask,
443 .irq_mask = exynos_irq_mask,
444 .irq_ack = exynos_irq_ack,
445 .irq_set_type = exynos_irq_set_type,
446 .irq_set_wake = exynos_wkup_irq_set_wake,
447 .irq_request_resources = exynos_irq_request_resources,
448 .irq_release_resources = exynos_irq_release_resources,
449 },
450 .eint_con = EXYNOS7_WKUP_ECON_OFFSET,
451 .eint_mask = EXYNOS7_WKUP_EMASK_OFFSET,
452 .eint_pend = EXYNOS7_WKUP_EPEND_OFFSET,
453 .eint_wake_mask_value = EXYNOS_EINT_WAKEUP_MASK_DISABLED,
454 .eint_wake_mask_reg = EXYNOS5433_EINT_WAKEUP_MASK,
455 .set_eint_wakeup_mask = exynos_pinctrl_set_eint_wakeup_mask,
456 };
457
458 /* list of external wakeup controllers supported */
459 static const struct of_device_id exynos_wkup_irq_ids[] = {
460 { .compatible = "samsung,s5pv210-wakeup-eint",
461 .data = &s5pv210_wkup_irq_chip },
462 { .compatible = "samsung,exynos4210-wakeup-eint",
463 .data = &exynos4210_wkup_irq_chip },
464 { .compatible = "samsung,exynos7-wakeup-eint",
465 .data = &exynos7_wkup_irq_chip },
466 { }
467 };
468
469 /* interrupt handler for wakeup interrupts 0..15 */
exynos_irq_eint0_15(struct irq_desc * desc)470 static void exynos_irq_eint0_15(struct irq_desc *desc)
471 {
472 struct exynos_weint_data *eintd = irq_desc_get_handler_data(desc);
473 struct samsung_pin_bank *bank = eintd->bank;
474 struct irq_chip *chip = irq_desc_get_chip(desc);
475 int eint_irq;
476
477 chained_irq_enter(chip, desc);
478
479 eint_irq = irq_linear_revmap(bank->irq_domain, eintd->irq);
480 generic_handle_irq(eint_irq);
481
482 chained_irq_exit(chip, desc);
483 }
484
exynos_irq_demux_eint(unsigned long pend,struct irq_domain * domain)485 static inline void exynos_irq_demux_eint(unsigned long pend,
486 struct irq_domain *domain)
487 {
488 unsigned int irq;
489
490 while (pend) {
491 irq = fls(pend) - 1;
492 generic_handle_irq(irq_find_mapping(domain, irq));
493 pend &= ~(1 << irq);
494 }
495 }
496
497 /* interrupt handler for wakeup interrupt 16 */
exynos_irq_demux_eint16_31(struct irq_desc * desc)498 static void exynos_irq_demux_eint16_31(struct irq_desc *desc)
499 {
500 struct irq_chip *chip = irq_desc_get_chip(desc);
501 struct exynos_muxed_weint_data *eintd = irq_desc_get_handler_data(desc);
502 unsigned long pend;
503 unsigned long mask;
504 int i;
505
506 chained_irq_enter(chip, desc);
507
508 for (i = 0; i < eintd->nr_banks; ++i) {
509 struct samsung_pin_bank *b = eintd->banks[i];
510 pend = readl(b->eint_base + b->irq_chip->eint_pend
511 + b->eint_offset);
512 mask = readl(b->eint_base + b->irq_chip->eint_mask
513 + b->eint_offset);
514 exynos_irq_demux_eint(pend & ~mask, b->irq_domain);
515 }
516
517 chained_irq_exit(chip, desc);
518 }
519
520 /*
521 * exynos_eint_wkup_init() - setup handling of external wakeup interrupts.
522 * @d: driver data of samsung pinctrl driver.
523 */
exynos_eint_wkup_init(struct samsung_pinctrl_drv_data * d)524 int exynos_eint_wkup_init(struct samsung_pinctrl_drv_data *d)
525 {
526 struct device *dev = d->dev;
527 struct device_node *wkup_np = NULL;
528 struct device_node *np;
529 struct samsung_pin_bank *bank;
530 struct exynos_weint_data *weint_data;
531 struct exynos_muxed_weint_data *muxed_data;
532 struct exynos_irq_chip *irq_chip;
533 unsigned int muxed_banks = 0;
534 unsigned int i;
535 int idx, irq;
536
537 for_each_child_of_node(dev->of_node, np) {
538 const struct of_device_id *match;
539
540 match = of_match_node(exynos_wkup_irq_ids, np);
541 if (match) {
542 irq_chip = kmemdup(match->data,
543 sizeof(*irq_chip), GFP_KERNEL);
544 if (!irq_chip) {
545 of_node_put(np);
546 return -ENOMEM;
547 }
548 wkup_np = np;
549 break;
550 }
551 }
552 if (!wkup_np)
553 return -ENODEV;
554
555 bank = d->pin_banks;
556 for (i = 0; i < d->nr_banks; ++i, ++bank) {
557 if (bank->eint_type != EINT_TYPE_WKUP)
558 continue;
559
560 bank->irq_domain = irq_domain_add_linear(bank->of_node,
561 bank->nr_pins, &exynos_eint_irqd_ops, bank);
562 if (!bank->irq_domain) {
563 dev_err(dev, "wkup irq domain add failed\n");
564 of_node_put(wkup_np);
565 return -ENXIO;
566 }
567
568 bank->irq_chip = irq_chip;
569
570 if (!of_find_property(bank->of_node, "interrupts", NULL)) {
571 bank->eint_type = EINT_TYPE_WKUP_MUX;
572 ++muxed_banks;
573 continue;
574 }
575
576 weint_data = devm_kcalloc(dev,
577 bank->nr_pins, sizeof(*weint_data),
578 GFP_KERNEL);
579 if (!weint_data) {
580 of_node_put(wkup_np);
581 return -ENOMEM;
582 }
583
584 for (idx = 0; idx < bank->nr_pins; ++idx) {
585 irq = irq_of_parse_and_map(bank->of_node, idx);
586 if (!irq) {
587 dev_err(dev, "irq number for eint-%s-%d not found\n",
588 bank->name, idx);
589 continue;
590 }
591 weint_data[idx].irq = idx;
592 weint_data[idx].bank = bank;
593 irq_set_chained_handler_and_data(irq,
594 exynos_irq_eint0_15,
595 &weint_data[idx]);
596 }
597 }
598
599 if (!muxed_banks) {
600 of_node_put(wkup_np);
601 return 0;
602 }
603
604 irq = irq_of_parse_and_map(wkup_np, 0);
605 of_node_put(wkup_np);
606 if (!irq) {
607 dev_err(dev, "irq number for muxed EINTs not found\n");
608 return 0;
609 }
610
611 muxed_data = devm_kzalloc(dev, sizeof(*muxed_data)
612 + muxed_banks*sizeof(struct samsung_pin_bank *), GFP_KERNEL);
613 if (!muxed_data)
614 return -ENOMEM;
615
616 irq_set_chained_handler_and_data(irq, exynos_irq_demux_eint16_31,
617 muxed_data);
618
619 bank = d->pin_banks;
620 idx = 0;
621 for (i = 0; i < d->nr_banks; ++i, ++bank) {
622 if (bank->eint_type != EINT_TYPE_WKUP_MUX)
623 continue;
624
625 muxed_data->banks[idx++] = bank;
626 }
627 muxed_data->nr_banks = muxed_banks;
628
629 return 0;
630 }
631
exynos_pinctrl_suspend_bank(struct samsung_pinctrl_drv_data * drvdata,struct samsung_pin_bank * bank)632 static void exynos_pinctrl_suspend_bank(
633 struct samsung_pinctrl_drv_data *drvdata,
634 struct samsung_pin_bank *bank)
635 {
636 struct exynos_eint_gpio_save *save = bank->soc_priv;
637 void __iomem *regs = bank->eint_base;
638
639 save->eint_con = readl(regs + EXYNOS_GPIO_ECON_OFFSET
640 + bank->eint_offset);
641 save->eint_fltcon0 = readl(regs + EXYNOS_GPIO_EFLTCON_OFFSET
642 + 2 * bank->eint_offset);
643 save->eint_fltcon1 = readl(regs + EXYNOS_GPIO_EFLTCON_OFFSET
644 + 2 * bank->eint_offset + 4);
645 save->eint_mask = readl(regs + bank->irq_chip->eint_mask
646 + bank->eint_offset);
647
648 pr_debug("%s: save con %#010x\n", bank->name, save->eint_con);
649 pr_debug("%s: save fltcon0 %#010x\n", bank->name, save->eint_fltcon0);
650 pr_debug("%s: save fltcon1 %#010x\n", bank->name, save->eint_fltcon1);
651 pr_debug("%s: save mask %#010x\n", bank->name, save->eint_mask);
652 }
653
exynos_pinctrl_suspend(struct samsung_pinctrl_drv_data * drvdata)654 void exynos_pinctrl_suspend(struct samsung_pinctrl_drv_data *drvdata)
655 {
656 struct samsung_pin_bank *bank = drvdata->pin_banks;
657 struct exynos_irq_chip *irq_chip = NULL;
658 int i;
659
660 for (i = 0; i < drvdata->nr_banks; ++i, ++bank) {
661 if (bank->eint_type == EINT_TYPE_GPIO)
662 exynos_pinctrl_suspend_bank(drvdata, bank);
663 else if (bank->eint_type == EINT_TYPE_WKUP) {
664 if (!irq_chip) {
665 irq_chip = bank->irq_chip;
666 irq_chip->set_eint_wakeup_mask(drvdata,
667 irq_chip);
668 } else if (bank->irq_chip != irq_chip) {
669 dev_warn(drvdata->dev,
670 "More than one external wakeup interrupt chip configured (bank: %s). This is not supported by hardware nor by driver.\n",
671 bank->name);
672 }
673 }
674 }
675 }
676
exynos_pinctrl_resume_bank(struct samsung_pinctrl_drv_data * drvdata,struct samsung_pin_bank * bank)677 static void exynos_pinctrl_resume_bank(
678 struct samsung_pinctrl_drv_data *drvdata,
679 struct samsung_pin_bank *bank)
680 {
681 struct exynos_eint_gpio_save *save = bank->soc_priv;
682 void __iomem *regs = bank->eint_base;
683
684 pr_debug("%s: con %#010x => %#010x\n", bank->name,
685 readl(regs + EXYNOS_GPIO_ECON_OFFSET
686 + bank->eint_offset), save->eint_con);
687 pr_debug("%s: fltcon0 %#010x => %#010x\n", bank->name,
688 readl(regs + EXYNOS_GPIO_EFLTCON_OFFSET
689 + 2 * bank->eint_offset), save->eint_fltcon0);
690 pr_debug("%s: fltcon1 %#010x => %#010x\n", bank->name,
691 readl(regs + EXYNOS_GPIO_EFLTCON_OFFSET
692 + 2 * bank->eint_offset + 4), save->eint_fltcon1);
693 pr_debug("%s: mask %#010x => %#010x\n", bank->name,
694 readl(regs + bank->irq_chip->eint_mask
695 + bank->eint_offset), save->eint_mask);
696
697 writel(save->eint_con, regs + EXYNOS_GPIO_ECON_OFFSET
698 + bank->eint_offset);
699 writel(save->eint_fltcon0, regs + EXYNOS_GPIO_EFLTCON_OFFSET
700 + 2 * bank->eint_offset);
701 writel(save->eint_fltcon1, regs + EXYNOS_GPIO_EFLTCON_OFFSET
702 + 2 * bank->eint_offset + 4);
703 writel(save->eint_mask, regs + bank->irq_chip->eint_mask
704 + bank->eint_offset);
705 }
706
exynos_pinctrl_resume(struct samsung_pinctrl_drv_data * drvdata)707 void exynos_pinctrl_resume(struct samsung_pinctrl_drv_data *drvdata)
708 {
709 struct samsung_pin_bank *bank = drvdata->pin_banks;
710 int i;
711
712 for (i = 0; i < drvdata->nr_banks; ++i, ++bank)
713 if (bank->eint_type == EINT_TYPE_GPIO)
714 exynos_pinctrl_resume_bank(drvdata, bank);
715 }
716
exynos_retention_enable(struct samsung_pinctrl_drv_data * drvdata)717 static void exynos_retention_enable(struct samsung_pinctrl_drv_data *drvdata)
718 {
719 if (drvdata->retention_ctrl->refcnt)
720 atomic_inc(drvdata->retention_ctrl->refcnt);
721 }
722
exynos_retention_disable(struct samsung_pinctrl_drv_data * drvdata)723 static void exynos_retention_disable(struct samsung_pinctrl_drv_data *drvdata)
724 {
725 struct samsung_retention_ctrl *ctrl = drvdata->retention_ctrl;
726 struct regmap *pmu_regs = ctrl->priv;
727 int i;
728
729 if (ctrl->refcnt && !atomic_dec_and_test(ctrl->refcnt))
730 return;
731
732 for (i = 0; i < ctrl->nr_regs; i++)
733 regmap_write(pmu_regs, ctrl->regs[i], ctrl->value);
734 }
735
736 struct samsung_retention_ctrl *
exynos_retention_init(struct samsung_pinctrl_drv_data * drvdata,const struct samsung_retention_data * data)737 exynos_retention_init(struct samsung_pinctrl_drv_data *drvdata,
738 const struct samsung_retention_data *data)
739 {
740 struct samsung_retention_ctrl *ctrl;
741 struct regmap *pmu_regs;
742 int i;
743
744 ctrl = devm_kzalloc(drvdata->dev, sizeof(*ctrl), GFP_KERNEL);
745 if (!ctrl)
746 return ERR_PTR(-ENOMEM);
747
748 pmu_regs = exynos_get_pmu_regmap();
749 if (IS_ERR(pmu_regs))
750 return ERR_CAST(pmu_regs);
751
752 ctrl->priv = pmu_regs;
753 ctrl->regs = data->regs;
754 ctrl->nr_regs = data->nr_regs;
755 ctrl->value = data->value;
756 ctrl->refcnt = data->refcnt;
757 ctrl->enable = exynos_retention_enable;
758 ctrl->disable = exynos_retention_disable;
759
760 /* Ensure that retention is disabled on driver init */
761 for (i = 0; i < ctrl->nr_regs; i++)
762 regmap_write(pmu_regs, ctrl->regs[i], ctrl->value);
763
764 return ctrl;
765 }
766