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         void (*set_eint_wakeup_mask)(struct samsung_pinctrl_drv_data *drvdata,
  44                                      struct exynos_irq_chip *irq_chip);
  45 };
  46
  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
  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
  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
  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
 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
 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
 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 const struct exynos_irq_chip exynos_gpio_irq_chip __initconst = {
 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
 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
 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  */
 277 __init 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
 301                 bank->irq_chip = devm_kmemdup(dev, &exynos_gpio_irq_chip,
 302                                            sizeof(*bank->irq_chip), GFP_KERNEL);
 303                 if (!bank->irq_chip) {
 304                         ret = -ENOMEM;
 305                         goto err_domains;
 306                 }
 307                 bank->irq_chip->chip.name = bank->name;
 308
 309                 bank->irq_domain = irq_domain_add_linear(bank->of_node,
 310                                 bank->nr_pins, &exynos_eint_irqd_ops, bank);
 311                 if (!bank->irq_domain) {
 312                         dev_err(dev, "gpio irq domain add failed\n");
 313                         ret = -ENXIO;
 314                         goto err_domains;
 315                 }
 316
 317                 bank->soc_priv = devm_kzalloc(d->dev,
 318                         sizeof(struct exynos_eint_gpio_save), GFP_KERNEL);
 319                 if (!bank->soc_priv) {
 320                         irq_domain_remove(bank->irq_domain);
 321                         ret = -ENOMEM;
 322                         goto err_domains;
 323                 }
 324
 325         }
 326
 327         return 0;
 328
 329 err_domains:
 330         for (--i, --bank; i >= 0; --i, --bank) {
 331                 if (bank->eint_type != EINT_TYPE_GPIO)
 332                         continue;
 333                 irq_domain_remove(bank->irq_domain);
 334         }
 335
 336         return ret;
 337 }
 338
 339 static int exynos_wkup_irq_set_wake(struct irq_data *irqd, unsigned int on)
 340 {
 341         struct irq_chip *chip = irq_data_get_irq_chip(irqd);
 342         struct exynos_irq_chip *our_chip = to_exynos_irq_chip(chip);
 343         struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(irqd);
 344         unsigned long bit = 1UL << (2 * bank->eint_offset + irqd->hwirq);
 345
 346         pr_info("wake %s for irq %d\n", on ? "enabled" : "disabled", irqd->irq);
 347
 348         if (!on)
 349                 *our_chip->eint_wake_mask_value |= bit;
 350         else
 351                 *our_chip->eint_wake_mask_value &= ~bit;
 352
 353         return 0;
 354 }
 355
 356 static void
 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
 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 static u32 eint_wake_mask_value = EXYNOS_EINT_WAKEUP_MASK_DISABLED;
 398 /*
 399  * irq_chip for wakeup interrupts
 400  */
 401 static const struct exynos_irq_chip s5pv210_wkup_irq_chip __initconst = {
 402         .chip = {
 403                 .name = "s5pv210_wkup_irq_chip",
 404                 .irq_unmask = exynos_irq_unmask,
 405                 .irq_mask = exynos_irq_mask,
 406                 .irq_ack = exynos_irq_ack,
 407                 .irq_set_type = exynos_irq_set_type,
 408                 .irq_set_wake = exynos_wkup_irq_set_wake,
 409                 .irq_request_resources = exynos_irq_request_resources,
 410                 .irq_release_resources = exynos_irq_release_resources,
 411         },
 412         .eint_con = EXYNOS_WKUP_ECON_OFFSET,
 413         .eint_mask = EXYNOS_WKUP_EMASK_OFFSET,
 414         .eint_pend = EXYNOS_WKUP_EPEND_OFFSET,
 415         .eint_wake_mask_value = &eint_wake_mask_value,
 416         /* Only differences with exynos4210_wkup_irq_chip: */
 417         .eint_wake_mask_reg = S5PV210_EINT_WAKEUP_MASK,
 418         .set_eint_wakeup_mask = s5pv210_pinctrl_set_eint_wakeup_mask,
 419 };
 420
 421 static const struct exynos_irq_chip exynos4210_wkup_irq_chip __initconst = {
 422         .chip = {
 423                 .name = "exynos4210_wkup_irq_chip",
 424                 .irq_unmask = exynos_irq_unmask,
 425                 .irq_mask = exynos_irq_mask,
 426                 .irq_ack = exynos_irq_ack,
 427                 .irq_set_type = exynos_irq_set_type,
 428                 .irq_set_wake = exynos_wkup_irq_set_wake,
 429                 .irq_request_resources = exynos_irq_request_resources,
 430                 .irq_release_resources = exynos_irq_release_resources,
 431         },
 432         .eint_con = EXYNOS_WKUP_ECON_OFFSET,
 433         .eint_mask = EXYNOS_WKUP_EMASK_OFFSET,
 434         .eint_pend = EXYNOS_WKUP_EPEND_OFFSET,
 435         .eint_wake_mask_value = &eint_wake_mask_value,
 436         .eint_wake_mask_reg = EXYNOS_EINT_WAKEUP_MASK,
 437         .set_eint_wakeup_mask = exynos_pinctrl_set_eint_wakeup_mask,
 438 };
 439
 440 static const struct exynos_irq_chip exynos7_wkup_irq_chip __initconst = {
 441         .chip = {
 442                 .name = "exynos7_wkup_irq_chip",
 443                 .irq_unmask = exynos_irq_unmask,
 444                 .irq_mask = exynos_irq_mask,
 445                 .irq_ack = exynos_irq_ack,
 446                 .irq_set_type = exynos_irq_set_type,
 447                 .irq_set_wake = exynos_wkup_irq_set_wake,
 448                 .irq_request_resources = exynos_irq_request_resources,
 449                 .irq_release_resources = exynos_irq_release_resources,
 450         },
 451         .eint_con = EXYNOS7_WKUP_ECON_OFFSET,
 452         .eint_mask = EXYNOS7_WKUP_EMASK_OFFSET,
 453         .eint_pend = EXYNOS7_WKUP_EPEND_OFFSET,
 454         .eint_wake_mask_value = &eint_wake_mask_value,
 455         .eint_wake_mask_reg = EXYNOS5433_EINT_WAKEUP_MASK,
 456         .set_eint_wakeup_mask = exynos_pinctrl_set_eint_wakeup_mask,
 457 };
 458
 459 /* list of external wakeup controllers supported */
 460 static const struct of_device_id exynos_wkup_irq_ids[] = {
 461         { .compatible = "samsung,s5pv210-wakeup-eint",
 462                         .data = &s5pv210_wkup_irq_chip },
 463         { .compatible = "samsung,exynos4210-wakeup-eint",
 464                         .data = &exynos4210_wkup_irq_chip },
 465         { .compatible = "samsung,exynos7-wakeup-eint",
 466                         .data = &exynos7_wkup_irq_chip },
 467         { }
 468 };
 469
 470 /* interrupt handler for wakeup interrupts 0..15 */
 471 static void exynos_irq_eint0_15(struct irq_desc *desc)
 472 {
 473         struct exynos_weint_data *eintd = irq_desc_get_handler_data(desc);
 474         struct samsung_pin_bank *bank = eintd->bank;
 475         struct irq_chip *chip = irq_desc_get_chip(desc);
 476         int eint_irq;
 477
 478         chained_irq_enter(chip, desc);
 479
 480         eint_irq = irq_linear_revmap(bank->irq_domain, eintd->irq);
 481         generic_handle_irq(eint_irq);
 482
 483         chained_irq_exit(chip, desc);
 484 }
 485
 486 static inline void exynos_irq_demux_eint(unsigned long pend,
 487                                                 struct irq_domain *domain)
 488 {
 489         unsigned int irq;
 490
 491         while (pend) {
 492                 irq = fls(pend) - 1;
 493                 generic_handle_irq(irq_find_mapping(domain, irq));
 494                 pend &= ~(1 << irq);
 495         }
 496 }
 497
 498 /* interrupt handler for wakeup interrupt 16 */
 499 static void exynos_irq_demux_eint16_31(struct irq_desc *desc)
 500 {
 501         struct irq_chip *chip = irq_desc_get_chip(desc);
 502         struct exynos_muxed_weint_data *eintd = irq_desc_get_handler_data(desc);
 503         unsigned long pend;
 504         unsigned long mask;
 505         int i;
 506
 507         chained_irq_enter(chip, desc);
 508
 509         for (i = 0; i < eintd->nr_banks; ++i) {
 510                 struct samsung_pin_bank *b = eintd->banks[i];
 511                 pend = readl(b->eint_base + b->irq_chip->eint_pend
 512                                 + b->eint_offset);
 513                 mask = readl(b->eint_base + b->irq_chip->eint_mask
 514                                 + b->eint_offset);
 515                 exynos_irq_demux_eint(pend & ~mask, b->irq_domain);
 516         }
 517
 518         chained_irq_exit(chip, desc);
 519 }
 520
 521 /*
 522  * exynos_eint_wkup_init() - setup handling of external wakeup interrupts.
 523  * @d: driver data of samsung pinctrl driver.
 524  */
 525 __init int exynos_eint_wkup_init(struct samsung_pinctrl_drv_data *d)
 526 {
 527         struct device *dev = d->dev;
 528         struct device_node *wkup_np = NULL;
 529         struct device_node *np;
 530         struct samsung_pin_bank *bank;
 531         struct exynos_weint_data *weint_data;
 532         struct exynos_muxed_weint_data *muxed_data;
 533         const struct exynos_irq_chip *irq_chip;
 534         unsigned int muxed_banks = 0;
 535         unsigned int i;
 536         int idx, irq;
 537
 538         for_each_child_of_node(dev->of_node, np) {
 539                 const struct of_device_id *match;
 540
 541                 match = of_match_node(exynos_wkup_irq_ids, np);
 542                 if (match) {
 543                         irq_chip = match->data;
 544                         wkup_np = np;
 545                         break;
 546                 }
 547         }
 548         if (!wkup_np)
 549                 return -ENODEV;
 550
 551         bank = d->pin_banks;
 552         for (i = 0; i < d->nr_banks; ++i, ++bank) {
 553                 if (bank->eint_type != EINT_TYPE_WKUP)
 554                         continue;
 555
 556                 bank->irq_chip = devm_kmemdup(dev, irq_chip, sizeof(*irq_chip),
 557                                               GFP_KERNEL);
 558                 if (!bank->irq_chip) {
 559                         of_node_put(wkup_np);
 560                         return -ENOMEM;
 561                 }
 562                 bank->irq_chip->chip.name = bank->name;
 563
 564                 bank->irq_domain = irq_domain_add_linear(bank->of_node,
 565                                 bank->nr_pins, &exynos_eint_irqd_ops, bank);
 566                 if (!bank->irq_domain) {
 567                         dev_err(dev, "wkup irq domain add failed\n");
 568                         of_node_put(wkup_np);
 569                         return -ENXIO;
 570                 }
 571
 572                 if (!of_find_property(bank->of_node, "interrupts", NULL)) {
 573                         bank->eint_type = EINT_TYPE_WKUP_MUX;
 574                         ++muxed_banks;
 575                         continue;
 576                 }
 577
 578                 weint_data = devm_kcalloc(dev,
 579                                           bank->nr_pins, sizeof(*weint_data),
 580                                           GFP_KERNEL);
 581                 if (!weint_data) {
 582                         of_node_put(wkup_np);
 583                         return -ENOMEM;
 584                 }
 585
 586                 for (idx = 0; idx < bank->nr_pins; ++idx) {
 587                         irq = irq_of_parse_and_map(bank->of_node, idx);
 588                         if (!irq) {
 589                                 dev_err(dev, "irq number for eint-%s-%d not found\n",
 590                                                         bank->name, idx);
 591                                 continue;
 592                         }
 593                         weint_data[idx].irq = idx;
 594                         weint_data[idx].bank = bank;
 595                         irq_set_chained_handler_and_data(irq,
 596                                                          exynos_irq_eint0_15,
 597                                                          &weint_data[idx]);
 598                 }
 599         }
 600
 601         if (!muxed_banks) {
 602                 of_node_put(wkup_np);
 603                 return 0;
 604         }
 605
 606         irq = irq_of_parse_and_map(wkup_np, 0);
 607         of_node_put(wkup_np);
 608         if (!irq) {
 609                 dev_err(dev, "irq number for muxed EINTs not found\n");
 610                 return 0;
 611         }
 612
 613         muxed_data = devm_kzalloc(dev, sizeof(*muxed_data)
 614                 + muxed_banks*sizeof(struct samsung_pin_bank *), GFP_KERNEL);
 615         if (!muxed_data)
 616                 return -ENOMEM;
 617
 618         irq_set_chained_handler_and_data(irq, exynos_irq_demux_eint16_31,
 619                                          muxed_data);
 620
 621         bank = d->pin_banks;
 622         idx = 0;
 623         for (i = 0; i < d->nr_banks; ++i, ++bank) {
 624                 if (bank->eint_type != EINT_TYPE_WKUP_MUX)
 625                         continue;
 626
 627                 muxed_data->banks[idx++] = bank;
 628         }
 629         muxed_data->nr_banks = muxed_banks;
 630
 631         return 0;
 632 }
 633
 634 static void exynos_pinctrl_suspend_bank(
 635                                 struct samsung_pinctrl_drv_data *drvdata,
 636                                 struct samsung_pin_bank *bank)
 637 {
 638         struct exynos_eint_gpio_save *save = bank->soc_priv;
 639         void __iomem *regs = bank->eint_base;
 640
 641         save->eint_con = readl(regs + EXYNOS_GPIO_ECON_OFFSET
 642                                                 + bank->eint_offset);
 643         save->eint_fltcon0 = readl(regs + EXYNOS_GPIO_EFLTCON_OFFSET
 644                                                 + 2 * bank->eint_offset);
 645         save->eint_fltcon1 = readl(regs + EXYNOS_GPIO_EFLTCON_OFFSET
 646                                                 + 2 * bank->eint_offset + 4);
 647         save->eint_mask = readl(regs + bank->irq_chip->eint_mask
 648                                                 + bank->eint_offset);
 649
 650         pr_debug("%s: save     con %#010x\n", bank->name, save->eint_con);
 651         pr_debug("%s: save fltcon0 %#010x\n", bank->name, save->eint_fltcon0);
 652         pr_debug("%s: save fltcon1 %#010x\n", bank->name, save->eint_fltcon1);
 653         pr_debug("%s: save    mask %#010x\n", bank->name, save->eint_mask);
 654 }
 655
 656 void exynos_pinctrl_suspend(struct samsung_pinctrl_drv_data *drvdata)
 657 {
 658         struct samsung_pin_bank *bank = drvdata->pin_banks;
 659         struct exynos_irq_chip *irq_chip = NULL;
 660         int i;
 661
 662         for (i = 0; i < drvdata->nr_banks; ++i, ++bank) {
 663                 if (bank->eint_type == EINT_TYPE_GPIO)
 664                         exynos_pinctrl_suspend_bank(drvdata, bank);
 665                 else if (bank->eint_type == EINT_TYPE_WKUP) {
 666                         if (!irq_chip) {
 667                                 irq_chip = bank->irq_chip;
 668                                 irq_chip->set_eint_wakeup_mask(drvdata,
 669                                                                irq_chip);
 670                         }
 671                 }
 672         }
 673 }
 674
 675 static void exynos_pinctrl_resume_bank(
 676                                 struct samsung_pinctrl_drv_data *drvdata,
 677                                 struct samsung_pin_bank *bank)
 678 {
 679         struct exynos_eint_gpio_save *save = bank->soc_priv;
 680         void __iomem *regs = bank->eint_base;
 681
 682         pr_debug("%s:     con %#010x => %#010x\n", bank->name,
 683                         readl(regs + EXYNOS_GPIO_ECON_OFFSET
 684                         + bank->eint_offset), save->eint_con);
 685         pr_debug("%s: fltcon0 %#010x => %#010x\n", bank->name,
 686                         readl(regs + EXYNOS_GPIO_EFLTCON_OFFSET
 687                         + 2 * bank->eint_offset), save->eint_fltcon0);
 688         pr_debug("%s: fltcon1 %#010x => %#010x\n", bank->name,
 689                         readl(regs + EXYNOS_GPIO_EFLTCON_OFFSET
 690                         + 2 * bank->eint_offset + 4), save->eint_fltcon1);
 691         pr_debug("%s:    mask %#010x => %#010x\n", bank->name,
 692                         readl(regs + bank->irq_chip->eint_mask
 693                         + bank->eint_offset), save->eint_mask);
 694
 695         writel(save->eint_con, regs + EXYNOS_GPIO_ECON_OFFSET
 696                                                 + bank->eint_offset);
 697         writel(save->eint_fltcon0, regs + EXYNOS_GPIO_EFLTCON_OFFSET
 698                                                 + 2 * bank->eint_offset);
 699         writel(save->eint_fltcon1, regs + EXYNOS_GPIO_EFLTCON_OFFSET
 700                                                 + 2 * bank->eint_offset + 4);
 701         writel(save->eint_mask, regs + bank->irq_chip->eint_mask
 702                                                 + bank->eint_offset);
 703 }
 704
 705 void exynos_pinctrl_resume(struct samsung_pinctrl_drv_data *drvdata)
 706 {
 707         struct samsung_pin_bank *bank = drvdata->pin_banks;
 708         int i;
 709
 710         for (i = 0; i < drvdata->nr_banks; ++i, ++bank)
 711                 if (bank->eint_type == EINT_TYPE_GPIO)
 712                         exynos_pinctrl_resume_bank(drvdata, bank);
 713 }
 714
 715 static void exynos_retention_enable(struct samsung_pinctrl_drv_data *drvdata)
 716 {
 717         if (drvdata->retention_ctrl->refcnt)
 718                 atomic_inc(drvdata->retention_ctrl->refcnt);
 719 }
 720
 721 static void exynos_retention_disable(struct samsung_pinctrl_drv_data *drvdata)
 722 {
 723         struct samsung_retention_ctrl *ctrl = drvdata->retention_ctrl;
 724         struct regmap *pmu_regs = ctrl->priv;
 725         int i;
 726
 727         if (ctrl->refcnt && !atomic_dec_and_test(ctrl->refcnt))
 728                 return;
 729
 730         for (i = 0; i < ctrl->nr_regs; i++)
 731                 regmap_write(pmu_regs, ctrl->regs[i], ctrl->value);
 732 }
 733
 734 struct samsung_retention_ctrl *
 735 exynos_retention_init(struct samsung_pinctrl_drv_data *drvdata,
 736                       const struct samsung_retention_data *data)
 737 {
 738         struct samsung_retention_ctrl *ctrl;
 739         struct regmap *pmu_regs;
 740         int i;
 741
 742         ctrl = devm_kzalloc(drvdata->dev, sizeof(*ctrl), GFP_KERNEL);
 743         if (!ctrl)
 744                 return ERR_PTR(-ENOMEM);
 745
 746         pmu_regs = exynos_get_pmu_regmap();
 747         if (IS_ERR(pmu_regs))
 748                 return ERR_CAST(pmu_regs);
 749
 750         ctrl->priv = pmu_regs;
 751         ctrl->regs = data->regs;
 752         ctrl->nr_regs = data->nr_regs;
 753         ctrl->value = data->value;
 754         ctrl->refcnt = data->refcnt;
 755         ctrl->enable = exynos_retention_enable;
 756         ctrl->disable = exynos_retention_disable;
 757
 758         /* Ensure that retention is disabled on driver init */
 759         for (i = 0; i < ctrl->nr_regs; i++)
 760                 regmap_write(pmu_regs, ctrl->regs[i], ctrl->value);
 761
 762         return ctrl;
 763 }