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 int 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 int 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 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
 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 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
 333 u32 exynos_get_eint_wake_mask(void)
 334 {
 335         return exynos_eint_wake_mask;
 336 }
 337
 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
 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 /*
 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 */
 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
 485 static inline void exynos_irq_demux_eint(unsigned int 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 */
 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 int pend;
 503         unsigned int 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  */
 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
 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
 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
 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
 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
 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
 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 *
 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 }