drivers/gpio/gpio-eic-sprd.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2018 Spreadtrum Communications Inc.
   4  * Copyright (C) 2018 Linaro Ltd.
   5  */
   6
   7 #include <linux/bitops.h>
   8 #include <linux/gpio/driver.h>
   9 #include <linux/interrupt.h>
  10 #include <linux/kernel.h>
  11 #include <linux/module.h>
  12 #include <linux/of_device.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/spinlock.h>
  15
  16 /* EIC registers definition */
  17 #define SPRD_EIC_DBNC_DATA              0x0
  18 #define SPRD_EIC_DBNC_DMSK              0x4
  19 #define SPRD_EIC_DBNC_IEV               0x14
  20 #define SPRD_EIC_DBNC_IE                0x18
  21 #define SPRD_EIC_DBNC_RIS               0x1c
  22 #define SPRD_EIC_DBNC_MIS               0x20
  23 #define SPRD_EIC_DBNC_IC                0x24
  24 #define SPRD_EIC_DBNC_TRIG              0x28
  25 #define SPRD_EIC_DBNC_CTRL0             0x40
  26
  27 #define SPRD_EIC_LATCH_INTEN            0x0
  28 #define SPRD_EIC_LATCH_INTRAW           0x4
  29 #define SPRD_EIC_LATCH_INTMSK           0x8
  30 #define SPRD_EIC_LATCH_INTCLR           0xc
  31 #define SPRD_EIC_LATCH_INTPOL           0x10
  32 #define SPRD_EIC_LATCH_INTMODE          0x14
  33
  34 #define SPRD_EIC_ASYNC_INTIE            0x0
  35 #define SPRD_EIC_ASYNC_INTRAW           0x4
  36 #define SPRD_EIC_ASYNC_INTMSK           0x8
  37 #define SPRD_EIC_ASYNC_INTCLR           0xc
  38 #define SPRD_EIC_ASYNC_INTMODE          0x10
  39 #define SPRD_EIC_ASYNC_INTBOTH          0x14
  40 #define SPRD_EIC_ASYNC_INTPOL           0x18
  41 #define SPRD_EIC_ASYNC_DATA             0x1c
  42
  43 #define SPRD_EIC_SYNC_INTIE             0x0
  44 #define SPRD_EIC_SYNC_INTRAW            0x4
  45 #define SPRD_EIC_SYNC_INTMSK            0x8
  46 #define SPRD_EIC_SYNC_INTCLR            0xc
  47 #define SPRD_EIC_SYNC_INTMODE           0x10
  48 #define SPRD_EIC_SYNC_INTBOTH           0x14
  49 #define SPRD_EIC_SYNC_INTPOL            0x18
  50 #define SPRD_EIC_SYNC_DATA              0x1c
  51
  52 /*
  53  * The digital-chip EIC controller can support maximum 3 banks, and each bank
  54  * contains 8 EICs.
  55  */
  56 #define SPRD_EIC_MAX_BANK               3
  57 #define SPRD_EIC_PER_BANK_NR            8
  58 #define SPRD_EIC_DATA_MASK              GENMASK(7, 0)
  59 #define SPRD_EIC_BIT(x)                 ((x) & (SPRD_EIC_PER_BANK_NR - 1))
  60 #define SPRD_EIC_DBNC_MASK              GENMASK(11, 0)
  61
  62 /*
  63  * The Spreadtrum EIC (external interrupt controller) can be used only in
  64  * input mode to generate interrupts if detecting input signals.
  65  *
  66  * The Spreadtrum digital-chip EIC controller contains 4 sub-modules:
  67  * debounce EIC, latch EIC, async EIC and sync EIC,
  68  *
  69  * The debounce EIC is used to capture the input signals' stable status
  70  * (millisecond resolution) and a single-trigger mechanism is introduced
  71  * into this sub-module to enhance the input event detection reliability.
  72  * The debounce range is from 1ms to 4s with a step size of 1ms.
  73  *
  74  * The latch EIC is used to latch some special power down signals and
  75  * generate interrupts, since the latch EIC does not depend on the APB clock
  76  * to capture signals.
  77  *
  78  * The async EIC uses a 32k clock to capture the short signals (microsecond
  79  * resolution) to generate interrupts by level or edge trigger.
  80  *
  81  * The EIC-sync is similar with GPIO's input function, which is a synchronized
  82  * signal input register.
  83  */
  84 enum sprd_eic_type {
  85         SPRD_EIC_DEBOUNCE,
  86         SPRD_EIC_LATCH,
  87         SPRD_EIC_ASYNC,
  88         SPRD_EIC_SYNC,
  89         SPRD_EIC_MAX,
  90 };
  91
  92 struct sprd_eic {
  93         struct gpio_chip chip;
  94         struct irq_chip intc;
  95         void __iomem *base[SPRD_EIC_MAX_BANK];
  96         enum sprd_eic_type type;
  97         spinlock_t lock;
  98         int irq;
  99 };
 100
 101 struct sprd_eic_variant_data {
 102         enum sprd_eic_type type;
 103         u32 num_eics;
 104 };
 105
 106 static const char *sprd_eic_label_name[SPRD_EIC_MAX] = {
 107         "eic-debounce", "eic-latch", "eic-async",
 108         "eic-sync",
 109 };
 110
 111 static const struct sprd_eic_variant_data sc9860_eic_dbnc_data = {
 112         .type = SPRD_EIC_DEBOUNCE,
 113         .num_eics = 8,
 114 };
 115
 116 static const struct sprd_eic_variant_data sc9860_eic_latch_data = {
 117         .type = SPRD_EIC_LATCH,
 118         .num_eics = 8,
 119 };
 120
 121 static const struct sprd_eic_variant_data sc9860_eic_async_data = {
 122         .type = SPRD_EIC_ASYNC,
 123         .num_eics = 8,
 124 };
 125
 126 static const struct sprd_eic_variant_data sc9860_eic_sync_data = {
 127         .type = SPRD_EIC_SYNC,
 128         .num_eics = 8,
 129 };
 130
 131 static inline void __iomem *sprd_eic_offset_base(struct sprd_eic *sprd_eic,
 132                                                  unsigned int bank)
 133 {
 134         if (bank >= SPRD_EIC_MAX_BANK)
 135                 return NULL;
 136
 137         return sprd_eic->base[bank];
 138 }
 139
 140 static void sprd_eic_update(struct gpio_chip *chip, unsigned int offset,
 141                             u16 reg, unsigned int val)
 142 {
 143         struct sprd_eic *sprd_eic = gpiochip_get_data(chip);
 144         void __iomem *base =
 145                 sprd_eic_offset_base(sprd_eic, offset / SPRD_EIC_PER_BANK_NR);
 146         unsigned long flags;
 147         u32 tmp;
 148
 149         spin_lock_irqsave(&sprd_eic->lock, flags);
 150         tmp = readl_relaxed(base + reg);
 151
 152         if (val)
 153                 tmp |= BIT(SPRD_EIC_BIT(offset));
 154         else
 155                 tmp &= ~BIT(SPRD_EIC_BIT(offset));
 156
 157         writel_relaxed(tmp, base + reg);
 158         spin_unlock_irqrestore(&sprd_eic->lock, flags);
 159 }
 160
 161 static int sprd_eic_read(struct gpio_chip *chip, unsigned int offset, u16 reg)
 162 {
 163         struct sprd_eic *sprd_eic = gpiochip_get_data(chip);
 164         void __iomem *base =
 165                 sprd_eic_offset_base(sprd_eic, offset / SPRD_EIC_PER_BANK_NR);
 166
 167         return !!(readl_relaxed(base + reg) & BIT(SPRD_EIC_BIT(offset)));
 168 }
 169
 170 static int sprd_eic_request(struct gpio_chip *chip, unsigned int offset)
 171 {
 172         sprd_eic_update(chip, offset, SPRD_EIC_DBNC_DMSK, 1);
 173         return 0;
 174 }
 175
 176 static void sprd_eic_free(struct gpio_chip *chip, unsigned int offset)
 177 {
 178         sprd_eic_update(chip, offset, SPRD_EIC_DBNC_DMSK, 0);
 179 }
 180
 181 static int sprd_eic_get(struct gpio_chip *chip, unsigned int offset)
 182 {
 183         struct sprd_eic *sprd_eic = gpiochip_get_data(chip);
 184
 185         switch (sprd_eic->type) {
 186         case SPRD_EIC_DEBOUNCE:
 187                 return sprd_eic_read(chip, offset, SPRD_EIC_DBNC_DATA);
 188         case SPRD_EIC_ASYNC:
 189                 return sprd_eic_read(chip, offset, SPRD_EIC_ASYNC_DATA);
 190         case SPRD_EIC_SYNC:
 191                 return sprd_eic_read(chip, offset, SPRD_EIC_SYNC_DATA);
 192         default:
 193                 return -ENOTSUPP;
 194         }
 195 }
 196
 197 static int sprd_eic_direction_input(struct gpio_chip *chip, unsigned int offset)
 198 {
 199         /* EICs are always input, nothing need to do here. */
 200         return 0;
 201 }
 202
 203 static void sprd_eic_set(struct gpio_chip *chip, unsigned int offset, int value)
 204 {
 205         /* EICs are always input, nothing need to do here. */
 206 }
 207
 208 static int sprd_eic_set_debounce(struct gpio_chip *chip, unsigned int offset,
 209                                  unsigned int debounce)
 210 {
 211         struct sprd_eic *sprd_eic = gpiochip_get_data(chip);
 212         void __iomem *base =
 213                 sprd_eic_offset_base(sprd_eic, offset / SPRD_EIC_PER_BANK_NR);
 214         u32 reg = SPRD_EIC_DBNC_CTRL0 + SPRD_EIC_BIT(offset) * 0x4;
 215         u32 value = readl_relaxed(base + reg) & ~SPRD_EIC_DBNC_MASK;
 216
 217         value |= (debounce / 1000) & SPRD_EIC_DBNC_MASK;
 218         writel_relaxed(value, base + reg);
 219
 220         return 0;
 221 }
 222
 223 static int sprd_eic_set_config(struct gpio_chip *chip, unsigned int offset,
 224                                unsigned long config)
 225 {
 226         unsigned long param = pinconf_to_config_param(config);
 227         u32 arg = pinconf_to_config_argument(config);
 228
 229         if (param == PIN_CONFIG_INPUT_DEBOUNCE)
 230                 return sprd_eic_set_debounce(chip, offset, arg);
 231
 232         return -ENOTSUPP;
 233 }
 234
 235 static void sprd_eic_irq_mask(struct irq_data *data)
 236 {
 237         struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
 238         struct sprd_eic *sprd_eic = gpiochip_get_data(chip);
 239         u32 offset = irqd_to_hwirq(data);
 240
 241         switch (sprd_eic->type) {
 242         case SPRD_EIC_DEBOUNCE:
 243                 sprd_eic_update(chip, offset, SPRD_EIC_DBNC_IE, 0);
 244                 sprd_eic_update(chip, offset, SPRD_EIC_DBNC_TRIG, 0);
 245                 break;
 246         case SPRD_EIC_LATCH:
 247                 sprd_eic_update(chip, offset, SPRD_EIC_LATCH_INTEN, 0);
 248                 break;
 249         case SPRD_EIC_ASYNC:
 250                 sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTIE, 0);
 251                 break;
 252         case SPRD_EIC_SYNC:
 253                 sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTIE, 0);
 254                 break;
 255         default:
 256                 dev_err(chip->parent, "Unsupported EIC type.\n");
 257         }
 258 }
 259
 260 static void sprd_eic_irq_unmask(struct irq_data *data)
 261 {
 262         struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
 263         struct sprd_eic *sprd_eic = gpiochip_get_data(chip);
 264         u32 offset = irqd_to_hwirq(data);
 265
 266         switch (sprd_eic->type) {
 267         case SPRD_EIC_DEBOUNCE:
 268                 sprd_eic_update(chip, offset, SPRD_EIC_DBNC_IE, 1);
 269                 sprd_eic_update(chip, offset, SPRD_EIC_DBNC_TRIG, 1);
 270                 break;
 271         case SPRD_EIC_LATCH:
 272                 sprd_eic_update(chip, offset, SPRD_EIC_LATCH_INTEN, 1);
 273                 break;
 274         case SPRD_EIC_ASYNC:
 275                 sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTIE, 1);
 276                 break;
 277         case SPRD_EIC_SYNC:
 278                 sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTIE, 1);
 279                 break;
 280         default:
 281                 dev_err(chip->parent, "Unsupported EIC type.\n");
 282         }
 283 }
 284
 285 static void sprd_eic_irq_ack(struct irq_data *data)
 286 {
 287         struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
 288         struct sprd_eic *sprd_eic = gpiochip_get_data(chip);
 289         u32 offset = irqd_to_hwirq(data);
 290
 291         switch (sprd_eic->type) {
 292         case SPRD_EIC_DEBOUNCE:
 293                 sprd_eic_update(chip, offset, SPRD_EIC_DBNC_IC, 1);
 294                 break;
 295         case SPRD_EIC_LATCH:
 296                 sprd_eic_update(chip, offset, SPRD_EIC_LATCH_INTCLR, 1);
 297                 break;
 298         case SPRD_EIC_ASYNC:
 299                 sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTCLR, 1);
 300                 break;
 301         case SPRD_EIC_SYNC:
 302                 sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTCLR, 1);
 303                 break;
 304         default:
 305                 dev_err(chip->parent, "Unsupported EIC type.\n");
 306         }
 307 }
 308
 309 static int sprd_eic_irq_set_type(struct irq_data *data, unsigned int flow_type)
 310 {
 311         struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
 312         struct sprd_eic *sprd_eic = gpiochip_get_data(chip);
 313         u32 offset = irqd_to_hwirq(data);
 314         int state;
 315
 316         switch (sprd_eic->type) {
 317         case SPRD_EIC_DEBOUNCE:
 318                 switch (flow_type) {
 319                 case IRQ_TYPE_LEVEL_HIGH:
 320                         sprd_eic_update(chip, offset, SPRD_EIC_DBNC_IEV, 1);
 321                         break;
 322                 case IRQ_TYPE_LEVEL_LOW:
 323                         sprd_eic_update(chip, offset, SPRD_EIC_DBNC_IEV, 0);
 324                         break;
 325                 case IRQ_TYPE_EDGE_RISING:
 326                 case IRQ_TYPE_EDGE_FALLING:
 327                 case IRQ_TYPE_EDGE_BOTH:
 328                         state = sprd_eic_get(chip, offset);
 329                         if (state)
 330                                 sprd_eic_update(chip, offset,
 331                                                 SPRD_EIC_DBNC_IEV, 0);
 332                         else
 333                                 sprd_eic_update(chip, offset,
 334                                                 SPRD_EIC_DBNC_IEV, 1);
 335                         break;
 336                 default:
 337                         return -ENOTSUPP;
 338                 }
 339
 340                 irq_set_handler_locked(data, handle_level_irq);
 341                 break;
 342         case SPRD_EIC_LATCH:
 343                 switch (flow_type) {
 344                 case IRQ_TYPE_LEVEL_HIGH:
 345                         sprd_eic_update(chip, offset, SPRD_EIC_LATCH_INTPOL, 0);
 346                         break;
 347                 case IRQ_TYPE_LEVEL_LOW:
 348                         sprd_eic_update(chip, offset, SPRD_EIC_LATCH_INTPOL, 1);
 349                         break;
 350                 case IRQ_TYPE_EDGE_RISING:
 351                 case IRQ_TYPE_EDGE_FALLING:
 352                 case IRQ_TYPE_EDGE_BOTH:
 353                         state = sprd_eic_get(chip, offset);
 354                         if (state)
 355                                 sprd_eic_update(chip, offset,
 356                                                 SPRD_EIC_LATCH_INTPOL, 0);
 357                         else
 358                                 sprd_eic_update(chip, offset,
 359                                                 SPRD_EIC_LATCH_INTPOL, 1);
 360                         break;
 361                 default:
 362                         return -ENOTSUPP;
 363                 }
 364
 365                 irq_set_handler_locked(data, handle_level_irq);
 366                 break;
 367         case SPRD_EIC_ASYNC:
 368                 switch (flow_type) {
 369                 case IRQ_TYPE_EDGE_RISING:
 370                         sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTBOTH, 0);
 371                         sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTMODE, 0);
 372                         sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTPOL, 1);
 373                         irq_set_handler_locked(data, handle_edge_irq);
 374                         break;
 375                 case IRQ_TYPE_EDGE_FALLING:
 376                         sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTBOTH, 0);
 377                         sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTMODE, 0);
 378                         sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTPOL, 0);
 379                         irq_set_handler_locked(data, handle_edge_irq);
 380                         break;
 381                 case IRQ_TYPE_EDGE_BOTH:
 382                         sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTMODE, 0);
 383                         sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTBOTH, 1);
 384                         irq_set_handler_locked(data, handle_edge_irq);
 385                         break;
 386                 case IRQ_TYPE_LEVEL_HIGH:
 387                         sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTBOTH, 0);
 388                         sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTMODE, 1);
 389                         sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTPOL, 1);
 390                         irq_set_handler_locked(data, handle_level_irq);
 391                         break;
 392                 case IRQ_TYPE_LEVEL_LOW:
 393                         sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTBOTH, 0);
 394                         sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTMODE, 1);
 395                         sprd_eic_update(chip, offset, SPRD_EIC_ASYNC_INTPOL, 0);
 396                         irq_set_handler_locked(data, handle_level_irq);
 397                         break;
 398                 default:
 399                         return -ENOTSUPP;
 400                 }
 401                 break;
 402         case SPRD_EIC_SYNC:
 403                 switch (flow_type) {
 404                 case IRQ_TYPE_EDGE_RISING:
 405                         sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTBOTH, 0);
 406                         sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTMODE, 0);
 407                         sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTPOL, 1);
 408                         irq_set_handler_locked(data, handle_edge_irq);
 409                         break;
 410                 case IRQ_TYPE_EDGE_FALLING:
 411                         sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTBOTH, 0);
 412                         sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTMODE, 0);
 413                         sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTPOL, 0);
 414                         irq_set_handler_locked(data, handle_edge_irq);
 415                         break;
 416                 case IRQ_TYPE_EDGE_BOTH:
 417                         sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTMODE, 0);
 418                         sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTBOTH, 1);
 419                         irq_set_handler_locked(data, handle_edge_irq);
 420                         break;
 421                 case IRQ_TYPE_LEVEL_HIGH:
 422                         sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTBOTH, 0);
 423                         sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTMODE, 1);
 424                         sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTPOL, 1);
 425                         irq_set_handler_locked(data, handle_level_irq);
 426                         break;
 427                 case IRQ_TYPE_LEVEL_LOW:
 428                         sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTBOTH, 0);
 429                         sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTMODE, 1);
 430                         sprd_eic_update(chip, offset, SPRD_EIC_SYNC_INTPOL, 0);
 431                         irq_set_handler_locked(data, handle_level_irq);
 432                         break;
 433                 default:
 434                         return -ENOTSUPP;
 435                 }
 436         default:
 437                 dev_err(chip->parent, "Unsupported EIC type.\n");
 438                 return -ENOTSUPP;
 439         }
 440
 441         return 0;
 442 }
 443
 444 static void sprd_eic_toggle_trigger(struct gpio_chip *chip, unsigned int irq,
 445                                     unsigned int offset)
 446 {
 447         struct sprd_eic *sprd_eic = gpiochip_get_data(chip);
 448         struct irq_data *data = irq_get_irq_data(irq);
 449         u32 trigger = irqd_get_trigger_type(data);
 450         int state, post_state;
 451
 452         /*
 453          * The debounce EIC and latch EIC can only support level trigger, so we
 454          * can toggle the level trigger to emulate the edge trigger.
 455          */
 456         if ((sprd_eic->type != SPRD_EIC_DEBOUNCE &&
 457              sprd_eic->type != SPRD_EIC_LATCH) ||
 458             !(trigger & IRQ_TYPE_EDGE_BOTH))
 459                 return;
 460
 461         sprd_eic_irq_mask(data);
 462         state = sprd_eic_get(chip, offset);
 463
 464 retry:
 465         switch (sprd_eic->type) {
 466         case SPRD_EIC_DEBOUNCE:
 467                 if (state)
 468                         sprd_eic_update(chip, offset, SPRD_EIC_DBNC_IEV, 0);
 469                 else
 470                         sprd_eic_update(chip, offset, SPRD_EIC_DBNC_IEV, 1);
 471                 break;
 472         case SPRD_EIC_LATCH:
 473                 if (state)
 474                         sprd_eic_update(chip, offset, SPRD_EIC_LATCH_INTPOL, 0);
 475                 else
 476                         sprd_eic_update(chip, offset, SPRD_EIC_LATCH_INTPOL, 1);
 477                 break;
 478         default:
 479                 sprd_eic_irq_unmask(data);
 480                 return;
 481         }
 482
 483         post_state = sprd_eic_get(chip, offset);
 484         if (state != post_state) {
 485                 dev_warn(chip->parent, "EIC level was changed.\n");
 486                 state = post_state;
 487                 goto retry;
 488         }
 489
 490         sprd_eic_irq_unmask(data);
 491 }
 492
 493 static int sprd_eic_match_chip_by_type(struct gpio_chip *chip, void *data)
 494 {
 495         enum sprd_eic_type type = *(enum sprd_eic_type *)data;
 496
 497         return !strcmp(chip->label, sprd_eic_label_name[type]);
 498 }
 499
 500 static void sprd_eic_handle_one_type(struct gpio_chip *chip)
 501 {
 502         struct sprd_eic *sprd_eic = gpiochip_get_data(chip);
 503         u32 bank, n, girq;
 504
 505         for (bank = 0; bank * SPRD_EIC_PER_BANK_NR < chip->ngpio; bank++) {
 506                 void __iomem *base = sprd_eic_offset_base(sprd_eic, bank);
 507                 unsigned long reg;
 508
 509                 switch (sprd_eic->type) {
 510                 case SPRD_EIC_DEBOUNCE:
 511                         reg = readl_relaxed(base + SPRD_EIC_DBNC_MIS) &
 512                                 SPRD_EIC_DATA_MASK;
 513                         break;
 514                 case SPRD_EIC_LATCH:
 515                         reg = readl_relaxed(base + SPRD_EIC_LATCH_INTMSK) &
 516                                 SPRD_EIC_DATA_MASK;
 517                         break;
 518                 case SPRD_EIC_ASYNC:
 519                         reg = readl_relaxed(base + SPRD_EIC_ASYNC_INTMSK) &
 520                                 SPRD_EIC_DATA_MASK;
 521                         break;
 522                 case SPRD_EIC_SYNC:
 523                         reg = readl_relaxed(base + SPRD_EIC_SYNC_INTMSK) &
 524                                 SPRD_EIC_DATA_MASK;
 525                         break;
 526                 default:
 527                         dev_err(chip->parent, "Unsupported EIC type.\n");
 528                         return;
 529                 }
 530
 531                 for_each_set_bit(n, &reg, SPRD_EIC_PER_BANK_NR) {
 532                         u32 offset = bank * SPRD_EIC_PER_BANK_NR + n;
 533
 534                         girq = irq_find_mapping(chip->irq.domain, offset);
 535
 536                         generic_handle_irq(girq);
 537                         sprd_eic_toggle_trigger(chip, girq, offset);
 538                 }
 539         }
 540 }
 541
 542 static void sprd_eic_irq_handler(struct irq_desc *desc)
 543 {
 544         struct irq_chip *ic = irq_desc_get_chip(desc);
 545         struct gpio_chip *chip;
 546         enum sprd_eic_type type;
 547
 548         chained_irq_enter(ic, desc);
 549
 550         /*
 551          * Since the digital-chip EIC 4 sub-modules (debounce, latch, async
 552          * and sync) share one same interrupt line, we should iterate each
 553          * EIC module to check if there are EIC interrupts were triggered.
 554          */
 555         for (type = SPRD_EIC_DEBOUNCE; type < SPRD_EIC_MAX; type++) {
 556                 chip = gpiochip_find(&type, sprd_eic_match_chip_by_type);
 557                 if (!chip)
 558                         continue;
 559
 560                 sprd_eic_handle_one_type(chip);
 561         }
 562
 563         chained_irq_exit(ic, desc);
 564 }
 565
 566 static int sprd_eic_probe(struct platform_device *pdev)
 567 {
 568         const struct sprd_eic_variant_data *pdata;
 569         struct gpio_irq_chip *irq;
 570         struct sprd_eic *sprd_eic;
 571         struct resource *res;
 572         int ret, i;
 573
 574         pdata = of_device_get_match_data(&pdev->dev);
 575         if (!pdata) {
 576                 dev_err(&pdev->dev, "No matching driver data found.\n");
 577                 return -EINVAL;
 578         }
 579
 580         sprd_eic = devm_kzalloc(&pdev->dev, sizeof(*sprd_eic), GFP_KERNEL);
 581         if (!sprd_eic)
 582                 return -ENOMEM;
 583
 584         spin_lock_init(&sprd_eic->lock);
 585         sprd_eic->type = pdata->type;
 586
 587         sprd_eic->irq = platform_get_irq(pdev, 0);
 588         if (sprd_eic->irq < 0) {
 589                 dev_err(&pdev->dev, "Failed to get EIC interrupt.\n");
 590                 return sprd_eic->irq;
 591         }
 592
 593         for (i = 0; i < SPRD_EIC_MAX_BANK; i++) {
 594                 /*
 595                  * We can have maximum 3 banks EICs, and each EIC has
 596                  * its own base address. But some platform maybe only
 597                  * have one bank EIC, thus base[1] and base[2] can be
 598                  * optional.
 599                  */
 600                 res = platform_get_resource(pdev, IORESOURCE_MEM, i);
 601                 if (!res)
 602                         continue;
 603
 604                 sprd_eic->base[i] = devm_ioremap_resource(&pdev->dev, res);
 605                 if (IS_ERR(sprd_eic->base[i]))
 606                         return PTR_ERR(sprd_eic->base[i]);
 607         }
 608
 609         sprd_eic->chip.label = sprd_eic_label_name[sprd_eic->type];
 610         sprd_eic->chip.ngpio = pdata->num_eics;
 611         sprd_eic->chip.base = -1;
 612         sprd_eic->chip.parent = &pdev->dev;
 613         sprd_eic->chip.of_node = pdev->dev.of_node;
 614         sprd_eic->chip.direction_input = sprd_eic_direction_input;
 615         switch (sprd_eic->type) {
 616         case SPRD_EIC_DEBOUNCE:
 617                 sprd_eic->chip.request = sprd_eic_request;
 618                 sprd_eic->chip.free = sprd_eic_free;
 619                 sprd_eic->chip.set_config = sprd_eic_set_config;
 620                 sprd_eic->chip.set = sprd_eic_set;
 621                 /* fall-through */
 622         case SPRD_EIC_ASYNC:
 623                 /* fall-through */
 624         case SPRD_EIC_SYNC:
 625                 sprd_eic->chip.get = sprd_eic_get;
 626                 break;
 627         case SPRD_EIC_LATCH:
 628                 /* fall-through */
 629         default:
 630                 break;
 631         }
 632
 633         sprd_eic->intc.name = dev_name(&pdev->dev);
 634         sprd_eic->intc.irq_ack = sprd_eic_irq_ack;
 635         sprd_eic->intc.irq_mask = sprd_eic_irq_mask;
 636         sprd_eic->intc.irq_unmask = sprd_eic_irq_unmask;
 637         sprd_eic->intc.irq_set_type = sprd_eic_irq_set_type;
 638         sprd_eic->intc.flags = IRQCHIP_SKIP_SET_WAKE;
 639
 640         irq = &sprd_eic->chip.irq;
 641         irq->chip = &sprd_eic->intc;
 642         irq->handler = handle_bad_irq;
 643         irq->default_type = IRQ_TYPE_NONE;
 644         irq->parent_handler = sprd_eic_irq_handler;
 645         irq->parent_handler_data = sprd_eic;
 646         irq->num_parents = 1;
 647         irq->parents = &sprd_eic->irq;
 648
 649         ret = devm_gpiochip_add_data(&pdev->dev, &sprd_eic->chip, sprd_eic);
 650         if (ret < 0) {
 651                 dev_err(&pdev->dev, "Could not register gpiochip %d.\n", ret);
 652                 return ret;
 653         }
 654
 655         platform_set_drvdata(pdev, sprd_eic);
 656         return 0;
 657 }
 658
 659 static const struct of_device_id sprd_eic_of_match[] = {
 660         {
 661                 .compatible = "sprd,sc9860-eic-debounce",
 662                 .data = &sc9860_eic_dbnc_data,
 663         },
 664         {
 665                 .compatible = "sprd,sc9860-eic-latch",
 666                 .data = &sc9860_eic_latch_data,
 667         },
 668         {
 669                 .compatible = "sprd,sc9860-eic-async",
 670                 .data = &sc9860_eic_async_data,
 671         },
 672         {
 673                 .compatible = "sprd,sc9860-eic-sync",
 674                 .data = &sc9860_eic_sync_data,
 675         },
 676         {
 677                 /* end of list */
 678         }
 679 };
 680 MODULE_DEVICE_TABLE(of, sprd_eic_of_match);
 681
 682 static struct platform_driver sprd_eic_driver = {
 683         .probe = sprd_eic_probe,
 684         .driver = {
 685                 .name = "sprd-eic",
 686                 .of_match_table = sprd_eic_of_match,
 687         },
 688 };
 689
 690 module_platform_driver(sprd_eic_driver);
 691
 692 MODULE_DESCRIPTION("Spreadtrum EIC driver");
 693 MODULE_LICENSE("GPL v2");