drivers/pinctrl/samsung/pinctrl-exynos.c

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