drivers/gpio/gpio-pxa.c

   1 /*
   2  *  linux/arch/arm/plat-pxa/gpio.c
   3  *
   4  *  Generic PXA GPIO handling
   5  *
   6  *  Author:     Nicolas Pitre
   7  *  Created:    Jun 15, 2001
   8  *  Copyright:  MontaVista Software Inc.
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License version 2 as
  12  *  published by the Free Software Foundation.
  13  */
  14 #include <linux/module.h>
  15 #include <linux/clk.h>
  16 #include <linux/err.h>
  17 #include <linux/gpio.h>
  18 #include <linux/gpio-pxa.h>
  19 #include <linux/init.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/irq.h>
  22 #include <linux/irqdomain.h>
  23 #include <linux/irqchip/chained_irq.h>
  24 #include <linux/io.h>
  25 #include <linux/of.h>
  26 #include <linux/of_device.h>
  27 #include <linux/pinctrl/consumer.h>
  28 #include <linux/platform_device.h>
  29 #include <linux/syscore_ops.h>
  30 #include <linux/slab.h>
  31
  32 /*
  33  * We handle the GPIOs by banks, each bank covers up to 32 GPIOs with
  34  * one set of registers. The register offsets are organized below:
  35  *
  36  *           GPLR    GPDR    GPSR    GPCR    GRER    GFER    GEDR
  37  * BANK 0 - 0x0000  0x000C  0x0018  0x0024  0x0030  0x003C  0x0048
  38  * BANK 1 - 0x0004  0x0010  0x001C  0x0028  0x0034  0x0040  0x004C
  39  * BANK 2 - 0x0008  0x0014  0x0020  0x002C  0x0038  0x0044  0x0050
  40  *
  41  * BANK 3 - 0x0100  0x010C  0x0118  0x0124  0x0130  0x013C  0x0148
  42  * BANK 4 - 0x0104  0x0110  0x011C  0x0128  0x0134  0x0140  0x014C
  43  * BANK 5 - 0x0108  0x0114  0x0120  0x012C  0x0138  0x0144  0x0150
  44  *
  45  * BANK 6 - 0x0200  0x020C  0x0218  0x0224  0x0230  0x023C  0x0248
  46  *
  47  * NOTE:
  48  *   BANK 3 is only available on PXA27x and later processors.
  49  *   BANK 4 and 5 are only available on PXA935, PXA1928
  50  *   BANK 6 is only available on PXA1928
  51  */
  52
  53 #define GPLR_OFFSET     0x00
  54 #define GPDR_OFFSET     0x0C
  55 #define GPSR_OFFSET     0x18
  56 #define GPCR_OFFSET     0x24
  57 #define GRER_OFFSET     0x30
  58 #define GFER_OFFSET     0x3C
  59 #define GEDR_OFFSET     0x48
  60 #define GAFR_OFFSET     0x54
  61 #define ED_MASK_OFFSET  0x9C    /* GPIO edge detection for AP side */
  62
  63 #define BANK_OFF(n)     (((n) / 3) << 8) + (((n) % 3) << 2)
  64
  65 int pxa_last_gpio;
  66 static int irq_base;
  67
  68 struct pxa_gpio_bank {
  69         void __iomem    *regbase;
  70         unsigned long   irq_mask;
  71         unsigned long   irq_edge_rise;
  72         unsigned long   irq_edge_fall;
  73
  74 #ifdef CONFIG_PM
  75         unsigned long   saved_gplr;
  76         unsigned long   saved_gpdr;
  77         unsigned long   saved_grer;
  78         unsigned long   saved_gfer;
  79 #endif
  80 };
  81
  82 struct pxa_gpio_chip {
  83         struct device *dev;
  84         struct gpio_chip chip;
  85         struct pxa_gpio_bank *banks;
  86         struct irq_domain *irqdomain;
  87
  88         int irq0;
  89         int irq1;
  90         int (*set_wake)(unsigned int gpio, unsigned int on);
  91 };
  92
  93 enum pxa_gpio_type {
  94         PXA25X_GPIO = 0,
  95         PXA26X_GPIO,
  96         PXA27X_GPIO,
  97         PXA3XX_GPIO,
  98         PXA93X_GPIO,
  99         MMP_GPIO = 0x10,
 100         MMP2_GPIO,
 101         PXA1928_GPIO,
 102 };
 103
 104 struct pxa_gpio_id {
 105         enum pxa_gpio_type      type;
 106         int                     gpio_nums;
 107 };
 108
 109 static DEFINE_SPINLOCK(gpio_lock);
 110 static struct pxa_gpio_chip *pxa_gpio_chip;
 111 static enum pxa_gpio_type gpio_type;
 112
 113 static struct pxa_gpio_id pxa25x_id = {
 114         .type           = PXA25X_GPIO,
 115         .gpio_nums      = 85,
 116 };
 117
 118 static struct pxa_gpio_id pxa26x_id = {
 119         .type           = PXA26X_GPIO,
 120         .gpio_nums      = 90,
 121 };
 122
 123 static struct pxa_gpio_id pxa27x_id = {
 124         .type           = PXA27X_GPIO,
 125         .gpio_nums      = 121,
 126 };
 127
 128 static struct pxa_gpio_id pxa3xx_id = {
 129         .type           = PXA3XX_GPIO,
 130         .gpio_nums      = 128,
 131 };
 132
 133 static struct pxa_gpio_id pxa93x_id = {
 134         .type           = PXA93X_GPIO,
 135         .gpio_nums      = 192,
 136 };
 137
 138 static struct pxa_gpio_id mmp_id = {
 139         .type           = MMP_GPIO,
 140         .gpio_nums      = 128,
 141 };
 142
 143 static struct pxa_gpio_id mmp2_id = {
 144         .type           = MMP2_GPIO,
 145         .gpio_nums      = 192,
 146 };
 147
 148 static struct pxa_gpio_id pxa1928_id = {
 149         .type           = PXA1928_GPIO,
 150         .gpio_nums      = 224,
 151 };
 152
 153 #define for_each_gpio_bank(i, b, pc)                                    \
 154         for (i = 0, b = pc->banks; i <= pxa_last_gpio; i += 32, b++)
 155
 156 static inline struct pxa_gpio_chip *chip_to_pxachip(struct gpio_chip *c)
 157 {
 158         struct pxa_gpio_chip *pxa_chip = gpiochip_get_data(c);
 159
 160         return pxa_chip;
 161 }
 162
 163 static inline void __iomem *gpio_bank_base(struct gpio_chip *c, int gpio)
 164 {
 165         struct pxa_gpio_chip *p = gpiochip_get_data(c);
 166         struct pxa_gpio_bank *bank = p->banks + (gpio / 32);
 167
 168         return bank->regbase;
 169 }
 170
 171 static inline struct pxa_gpio_bank *gpio_to_pxabank(struct gpio_chip *c,
 172                                                     unsigned gpio)
 173 {
 174         return chip_to_pxachip(c)->banks + gpio / 32;
 175 }
 176
 177 static inline int gpio_is_pxa_type(int type)
 178 {
 179         return (type & MMP_GPIO) == 0;
 180 }
 181
 182 static inline int gpio_is_mmp_type(int type)
 183 {
 184         return (type & MMP_GPIO) != 0;
 185 }
 186
 187 /* GPIO86/87/88/89 on PXA26x have their direction bits in PXA_GPDR(2 inverted,
 188  * as well as their Alternate Function value being '1' for GPIO in GAFRx.
 189  */
 190 static inline int __gpio_is_inverted(int gpio)
 191 {
 192         if ((gpio_type == PXA26X_GPIO) && (gpio > 85))
 193                 return 1;
 194         return 0;
 195 }
 196
 197 /*
 198  * On PXA25x and PXA27x, GAFRx and GPDRx together decide the alternate
 199  * function of a GPIO, and GPDRx cannot be altered once configured. It
 200  * is attributed as "occupied" here (I know this terminology isn't
 201  * accurate, you are welcome to propose a better one :-)
 202  */
 203 static inline int __gpio_is_occupied(struct pxa_gpio_chip *pchip, unsigned gpio)
 204 {
 205         void __iomem *base;
 206         unsigned long gafr = 0, gpdr = 0;
 207         int ret, af = 0, dir = 0;
 208
 209         base = gpio_bank_base(&pchip->chip, gpio);
 210         gpdr = readl_relaxed(base + GPDR_OFFSET);
 211
 212         switch (gpio_type) {
 213         case PXA25X_GPIO:
 214         case PXA26X_GPIO:
 215         case PXA27X_GPIO:
 216                 gafr = readl_relaxed(base + GAFR_OFFSET);
 217                 af = (gafr >> ((gpio & 0xf) * 2)) & 0x3;
 218                 dir = gpdr & GPIO_bit(gpio);
 219
 220                 if (__gpio_is_inverted(gpio))
 221                         ret = (af != 1) || (dir == 0);
 222                 else
 223                         ret = (af != 0) || (dir != 0);
 224                 break;
 225         default:
 226                 ret = gpdr & GPIO_bit(gpio);
 227                 break;
 228         }
 229         return ret;
 230 }
 231
 232 int pxa_irq_to_gpio(int irq)
 233 {
 234         struct pxa_gpio_chip *pchip = pxa_gpio_chip;
 235         int irq_gpio0;
 236
 237         irq_gpio0 = irq_find_mapping(pchip->irqdomain, 0);
 238         if (irq_gpio0 > 0)
 239                 return irq - irq_gpio0;
 240
 241         return irq_gpio0;
 242 }
 243
 244 static int pxa_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
 245 {
 246         struct pxa_gpio_chip *pchip = chip_to_pxachip(chip);
 247
 248         return irq_find_mapping(pchip->irqdomain, offset);
 249 }
 250
 251 static int pxa_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
 252 {
 253         void __iomem *base = gpio_bank_base(chip, offset);
 254         uint32_t value, mask = GPIO_bit(offset);
 255         unsigned long flags;
 256         int ret;
 257
 258         ret = pinctrl_gpio_direction_input(chip->base + offset);
 259         if (!ret)
 260                 return 0;
 261
 262         spin_lock_irqsave(&gpio_lock, flags);
 263
 264         value = readl_relaxed(base + GPDR_OFFSET);
 265         if (__gpio_is_inverted(chip->base + offset))
 266                 value |= mask;
 267         else
 268                 value &= ~mask;
 269         writel_relaxed(value, base + GPDR_OFFSET);
 270
 271         spin_unlock_irqrestore(&gpio_lock, flags);
 272         return 0;
 273 }
 274
 275 static int pxa_gpio_direction_output(struct gpio_chip *chip,
 276                                      unsigned offset, int value)
 277 {
 278         void __iomem *base = gpio_bank_base(chip, offset);
 279         uint32_t tmp, mask = GPIO_bit(offset);
 280         unsigned long flags;
 281         int ret;
 282
 283         writel_relaxed(mask, base + (value ? GPSR_OFFSET : GPCR_OFFSET));
 284
 285         ret = pinctrl_gpio_direction_output(chip->base + offset);
 286         if (ret)
 287                 return ret;
 288
 289         spin_lock_irqsave(&gpio_lock, flags);
 290
 291         tmp = readl_relaxed(base + GPDR_OFFSET);
 292         if (__gpio_is_inverted(chip->base + offset))
 293                 tmp &= ~mask;
 294         else
 295                 tmp |= mask;
 296         writel_relaxed(tmp, base + GPDR_OFFSET);
 297
 298         spin_unlock_irqrestore(&gpio_lock, flags);
 299         return 0;
 300 }
 301
 302 static int pxa_gpio_get(struct gpio_chip *chip, unsigned offset)
 303 {
 304         void __iomem *base = gpio_bank_base(chip, offset);
 305         u32 gplr = readl_relaxed(base + GPLR_OFFSET);
 306
 307         return !!(gplr & GPIO_bit(offset));
 308 }
 309
 310 static void pxa_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
 311 {
 312         void __iomem *base = gpio_bank_base(chip, offset);
 313
 314         writel_relaxed(GPIO_bit(offset),
 315                        base + (value ? GPSR_OFFSET : GPCR_OFFSET));
 316 }
 317
 318 #ifdef CONFIG_OF_GPIO
 319 static int pxa_gpio_of_xlate(struct gpio_chip *gc,
 320                              const struct of_phandle_args *gpiospec,
 321                              u32 *flags)
 322 {
 323         if (gpiospec->args[0] > pxa_last_gpio)
 324                 return -EINVAL;
 325
 326         if (flags)
 327                 *flags = gpiospec->args[1];
 328
 329         return gpiospec->args[0];
 330 }
 331 #endif
 332
 333 static int pxa_init_gpio_chip(struct pxa_gpio_chip *pchip, int ngpio,
 334                               struct device_node *np, void __iomem *regbase)
 335 {
 336         int i, gpio, nbanks = DIV_ROUND_UP(ngpio, 32);
 337         struct pxa_gpio_bank *bank;
 338
 339         pchip->banks = devm_kcalloc(pchip->dev, nbanks, sizeof(*pchip->banks),
 340                                     GFP_KERNEL);
 341         if (!pchip->banks)
 342                 return -ENOMEM;
 343
 344         pchip->chip.label = "gpio-pxa";
 345         pchip->chip.direction_input  = pxa_gpio_direction_input;
 346         pchip->chip.direction_output = pxa_gpio_direction_output;
 347         pchip->chip.get = pxa_gpio_get;
 348         pchip->chip.set = pxa_gpio_set;
 349         pchip->chip.to_irq = pxa_gpio_to_irq;
 350         pchip->chip.ngpio = ngpio;
 351         pchip->chip.request = gpiochip_generic_request;
 352         pchip->chip.free = gpiochip_generic_free;
 353 #ifdef CONFIG_OF_GPIO
 354         pchip->chip.of_node = np;
 355         pchip->chip.of_xlate = pxa_gpio_of_xlate;
 356         pchip->chip.of_gpio_n_cells = 2;
 357 #endif
 358
 359         for (i = 0, gpio = 0; i < nbanks; i++, gpio += 32) {
 360                 bank = pchip->banks + i;
 361                 bank->regbase = regbase + BANK_OFF(i);
 362         }
 363
 364         return gpiochip_add_data(&pchip->chip, pchip);
 365 }
 366
 367 /* Update only those GRERx and GFERx edge detection register bits if those
 368  * bits are set in c->irq_mask
 369  */
 370 static inline void update_edge_detect(struct pxa_gpio_bank *c)
 371 {
 372         uint32_t grer, gfer;
 373
 374         grer = readl_relaxed(c->regbase + GRER_OFFSET) & ~c->irq_mask;
 375         gfer = readl_relaxed(c->regbase + GFER_OFFSET) & ~c->irq_mask;
 376         grer |= c->irq_edge_rise & c->irq_mask;
 377         gfer |= c->irq_edge_fall & c->irq_mask;
 378         writel_relaxed(grer, c->regbase + GRER_OFFSET);
 379         writel_relaxed(gfer, c->regbase + GFER_OFFSET);
 380 }
 381
 382 static int pxa_gpio_irq_type(struct irq_data *d, unsigned int type)
 383 {
 384         struct pxa_gpio_chip *pchip = irq_data_get_irq_chip_data(d);
 385         unsigned int gpio = irqd_to_hwirq(d);
 386         struct pxa_gpio_bank *c = gpio_to_pxabank(&pchip->chip, gpio);
 387         unsigned long gpdr, mask = GPIO_bit(gpio);
 388
 389         if (type == IRQ_TYPE_PROBE) {
 390                 /* Don't mess with enabled GPIOs using preconfigured edges or
 391                  * GPIOs set to alternate function or to output during probe
 392                  */
 393                 if ((c->irq_edge_rise | c->irq_edge_fall) & GPIO_bit(gpio))
 394                         return 0;
 395
 396                 if (__gpio_is_occupied(pchip, gpio))
 397                         return 0;
 398
 399                 type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
 400         }
 401
 402         gpdr = readl_relaxed(c->regbase + GPDR_OFFSET);
 403
 404         if (__gpio_is_inverted(gpio))
 405                 writel_relaxed(gpdr | mask,  c->regbase + GPDR_OFFSET);
 406         else
 407                 writel_relaxed(gpdr & ~mask, c->regbase + GPDR_OFFSET);
 408
 409         if (type & IRQ_TYPE_EDGE_RISING)
 410                 c->irq_edge_rise |= mask;
 411         else
 412                 c->irq_edge_rise &= ~mask;
 413
 414         if (type & IRQ_TYPE_EDGE_FALLING)
 415                 c->irq_edge_fall |= mask;
 416         else
 417                 c->irq_edge_fall &= ~mask;
 418
 419         update_edge_detect(c);
 420
 421         pr_debug("%s: IRQ%d (GPIO%d) - edge%s%s\n", __func__, d->irq, gpio,
 422                 ((type & IRQ_TYPE_EDGE_RISING)  ? " rising"  : ""),
 423                 ((type & IRQ_TYPE_EDGE_FALLING) ? " falling" : ""));
 424         return 0;
 425 }
 426
 427 static irqreturn_t pxa_gpio_demux_handler(int in_irq, void *d)
 428 {
 429         int loop, gpio, n, handled = 0;
 430         unsigned long gedr;
 431         struct pxa_gpio_chip *pchip = d;
 432         struct pxa_gpio_bank *c;
 433
 434         do {
 435                 loop = 0;
 436                 for_each_gpio_bank(gpio, c, pchip) {
 437                         gedr = readl_relaxed(c->regbase + GEDR_OFFSET);
 438                         gedr = gedr & c->irq_mask;
 439                         writel_relaxed(gedr, c->regbase + GEDR_OFFSET);
 440
 441                         for_each_set_bit(n, &gedr, BITS_PER_LONG) {
 442                                 loop = 1;
 443
 444                                 generic_handle_irq(
 445                                         irq_find_mapping(pchip->irqdomain,
 446                                                          gpio + n));
 447                         }
 448                 }
 449                 handled += loop;
 450         } while (loop);
 451
 452         return handled ? IRQ_HANDLED : IRQ_NONE;
 453 }
 454
 455 static irqreturn_t pxa_gpio_direct_handler(int in_irq, void *d)
 456 {
 457         struct pxa_gpio_chip *pchip = d;
 458
 459         if (in_irq == pchip->irq0) {
 460                 generic_handle_irq(irq_find_mapping(pchip->irqdomain, 0));
 461         } else if (in_irq == pchip->irq1) {
 462                 generic_handle_irq(irq_find_mapping(pchip->irqdomain, 1));
 463         } else {
 464                 pr_err("%s() unknown irq %d\n", __func__, in_irq);
 465                 return IRQ_NONE;
 466         }
 467         return IRQ_HANDLED;
 468 }
 469
 470 static void pxa_ack_muxed_gpio(struct irq_data *d)
 471 {
 472         struct pxa_gpio_chip *pchip = irq_data_get_irq_chip_data(d);
 473         unsigned int gpio = irqd_to_hwirq(d);
 474         void __iomem *base = gpio_bank_base(&pchip->chip, gpio);
 475
 476         writel_relaxed(GPIO_bit(gpio), base + GEDR_OFFSET);
 477 }
 478
 479 static void pxa_mask_muxed_gpio(struct irq_data *d)
 480 {
 481         struct pxa_gpio_chip *pchip = irq_data_get_irq_chip_data(d);
 482         unsigned int gpio = irqd_to_hwirq(d);
 483         struct pxa_gpio_bank *b = gpio_to_pxabank(&pchip->chip, gpio);
 484         void __iomem *base = gpio_bank_base(&pchip->chip, gpio);
 485         uint32_t grer, gfer;
 486
 487         b->irq_mask &= ~GPIO_bit(gpio);
 488
 489         grer = readl_relaxed(base + GRER_OFFSET) & ~GPIO_bit(gpio);
 490         gfer = readl_relaxed(base + GFER_OFFSET) & ~GPIO_bit(gpio);
 491         writel_relaxed(grer, base + GRER_OFFSET);
 492         writel_relaxed(gfer, base + GFER_OFFSET);
 493 }
 494
 495 static int pxa_gpio_set_wake(struct irq_data *d, unsigned int on)
 496 {
 497         struct pxa_gpio_chip *pchip = irq_data_get_irq_chip_data(d);
 498         unsigned int gpio = irqd_to_hwirq(d);
 499
 500         if (pchip->set_wake)
 501                 return pchip->set_wake(gpio, on);
 502         else
 503                 return 0;
 504 }
 505
 506 static void pxa_unmask_muxed_gpio(struct irq_data *d)
 507 {
 508         struct pxa_gpio_chip *pchip = irq_data_get_irq_chip_data(d);
 509         unsigned int gpio = irqd_to_hwirq(d);
 510         struct pxa_gpio_bank *c = gpio_to_pxabank(&pchip->chip, gpio);
 511
 512         c->irq_mask |= GPIO_bit(gpio);
 513         update_edge_detect(c);
 514 }
 515
 516 static struct irq_chip pxa_muxed_gpio_chip = {
 517         .name           = "GPIO",
 518         .irq_ack        = pxa_ack_muxed_gpio,
 519         .irq_mask       = pxa_mask_muxed_gpio,
 520         .irq_unmask     = pxa_unmask_muxed_gpio,
 521         .irq_set_type   = pxa_gpio_irq_type,
 522         .irq_set_wake   = pxa_gpio_set_wake,
 523 };
 524
 525 static int pxa_gpio_nums(struct platform_device *pdev)
 526 {
 527         const struct platform_device_id *id = platform_get_device_id(pdev);
 528         struct pxa_gpio_id *pxa_id = (struct pxa_gpio_id *)id->driver_data;
 529         int count = 0;
 530
 531         switch (pxa_id->type) {
 532         case PXA25X_GPIO:
 533         case PXA26X_GPIO:
 534         case PXA27X_GPIO:
 535         case PXA3XX_GPIO:
 536         case PXA93X_GPIO:
 537         case MMP_GPIO:
 538         case MMP2_GPIO:
 539         case PXA1928_GPIO:
 540                 gpio_type = pxa_id->type;
 541                 count = pxa_id->gpio_nums - 1;
 542                 break;
 543         default:
 544                 count = -EINVAL;
 545                 break;
 546         }
 547         return count;
 548 }
 549
 550 static int pxa_irq_domain_map(struct irq_domain *d, unsigned int irq,
 551                               irq_hw_number_t hw)
 552 {
 553         irq_set_chip_and_handler(irq, &pxa_muxed_gpio_chip,
 554                                  handle_edge_irq);
 555         irq_set_chip_data(irq, d->host_data);
 556         irq_set_noprobe(irq);
 557         return 0;
 558 }
 559
 560 const struct irq_domain_ops pxa_irq_domain_ops = {
 561         .map    = pxa_irq_domain_map,
 562         .xlate  = irq_domain_xlate_twocell,
 563 };
 564
 565 #ifdef CONFIG_OF
 566 static const struct of_device_id pxa_gpio_dt_ids[] = {
 567         { .compatible = "intel,pxa25x-gpio",    .data = &pxa25x_id, },
 568         { .compatible = "intel,pxa26x-gpio",    .data = &pxa26x_id, },
 569         { .compatible = "intel,pxa27x-gpio",    .data = &pxa27x_id, },
 570         { .compatible = "intel,pxa3xx-gpio",    .data = &pxa3xx_id, },
 571         { .compatible = "marvell,pxa93x-gpio",  .data = &pxa93x_id, },
 572         { .compatible = "marvell,mmp-gpio",     .data = &mmp_id, },
 573         { .compatible = "marvell,mmp2-gpio",    .data = &mmp2_id, },
 574         { .compatible = "marvell,pxa1928-gpio", .data = &pxa1928_id, },
 575         {}
 576 };
 577
 578 static int pxa_gpio_probe_dt(struct platform_device *pdev,
 579                              struct pxa_gpio_chip *pchip)
 580 {
 581         int nr_gpios;
 582         const struct of_device_id *of_id =
 583                                 of_match_device(pxa_gpio_dt_ids, &pdev->dev);
 584         const struct pxa_gpio_id *gpio_id;
 585
 586         if (!of_id || !of_id->data) {
 587                 dev_err(&pdev->dev, "Failed to find gpio controller\n");
 588                 return -EFAULT;
 589         }
 590         gpio_id = of_id->data;
 591         gpio_type = gpio_id->type;
 592
 593         nr_gpios = gpio_id->gpio_nums;
 594         pxa_last_gpio = nr_gpios - 1;
 595
 596         irq_base = devm_irq_alloc_descs(&pdev->dev, -1, 0, nr_gpios, 0);
 597         if (irq_base < 0) {
 598                 dev_err(&pdev->dev, "Failed to allocate IRQ numbers\n");
 599                 return irq_base;
 600         }
 601         return irq_base;
 602 }
 603 #else
 604 #define pxa_gpio_probe_dt(pdev, pchip)          (-1)
 605 #endif
 606
 607 static int pxa_gpio_probe(struct platform_device *pdev)
 608 {
 609         struct pxa_gpio_chip *pchip;
 610         struct pxa_gpio_bank *c;
 611         struct resource *res;
 612         struct clk *clk;
 613         struct pxa_gpio_platform_data *info;
 614         void __iomem *gpio_reg_base;
 615         int gpio, ret;
 616         int irq0 = 0, irq1 = 0, irq_mux, gpio_offset = 0;
 617
 618         pchip = devm_kzalloc(&pdev->dev, sizeof(*pchip), GFP_KERNEL);
 619         if (!pchip)
 620                 return -ENOMEM;
 621         pchip->dev = &pdev->dev;
 622
 623         info = dev_get_platdata(&pdev->dev);
 624         if (info) {
 625                 irq_base = info->irq_base;
 626                 if (irq_base <= 0)
 627                         return -EINVAL;
 628                 pxa_last_gpio = pxa_gpio_nums(pdev);
 629                 pchip->set_wake = info->gpio_set_wake;
 630         } else {
 631                 irq_base = pxa_gpio_probe_dt(pdev, pchip);
 632                 if (irq_base < 0)
 633                         return -EINVAL;
 634         }
 635
 636         if (!pxa_last_gpio)
 637                 return -EINVAL;
 638
 639         pchip->irqdomain = irq_domain_add_legacy(pdev->dev.of_node,
 640                                                  pxa_last_gpio + 1, irq_base,
 641                                                  0, &pxa_irq_domain_ops, pchip);
 642         if (!pchip->irqdomain)
 643                 return -ENOMEM;
 644
 645         irq0 = platform_get_irq_byname(pdev, "gpio0");
 646         irq1 = platform_get_irq_byname(pdev, "gpio1");
 647         irq_mux = platform_get_irq_byname(pdev, "gpio_mux");
 648         if ((irq0 > 0 && irq1 <= 0) || (irq0 <= 0 && irq1 > 0)
 649                 || (irq_mux <= 0))
 650                 return -EINVAL;
 651
 652         pchip->irq0 = irq0;
 653         pchip->irq1 = irq1;
 654         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 655         gpio_reg_base = devm_ioremap(&pdev->dev, res->start,
 656                                      resource_size(res));
 657         if (!gpio_reg_base)
 658                 return -EINVAL;
 659
 660         if (irq0 > 0)
 661                 gpio_offset = 2;
 662
 663         clk = clk_get(&pdev->dev, NULL);
 664         if (IS_ERR(clk)) {
 665                 dev_err(&pdev->dev, "Error %ld to get gpio clock\n",
 666                         PTR_ERR(clk));
 667                 return PTR_ERR(clk);
 668         }
 669         ret = clk_prepare_enable(clk);
 670         if (ret) {
 671                 clk_put(clk);
 672                 return ret;
 673         }
 674
 675         /* Initialize GPIO chips */
 676         ret = pxa_init_gpio_chip(pchip, pxa_last_gpio + 1, pdev->dev.of_node,
 677                                  gpio_reg_base);
 678         if (ret) {
 679                 clk_put(clk);
 680                 return ret;
 681         }
 682
 683         /* clear all GPIO edge detects */
 684         for_each_gpio_bank(gpio, c, pchip) {
 685                 writel_relaxed(0, c->regbase + GFER_OFFSET);
 686                 writel_relaxed(0, c->regbase + GRER_OFFSET);
 687                 writel_relaxed(~0, c->regbase + GEDR_OFFSET);
 688                 /* unmask GPIO edge detect for AP side */
 689                 if (gpio_is_mmp_type(gpio_type))
 690                         writel_relaxed(~0, c->regbase + ED_MASK_OFFSET);
 691         }
 692
 693         if (irq0 > 0) {
 694                 ret = devm_request_irq(&pdev->dev,
 695                                        irq0, pxa_gpio_direct_handler, 0,
 696                                        "gpio-0", pchip);
 697                 if (ret)
 698                         dev_err(&pdev->dev, "request of gpio0 irq failed: %d\n",
 699                                 ret);
 700         }
 701         if (irq1 > 0) {
 702                 ret = devm_request_irq(&pdev->dev,
 703                                        irq1, pxa_gpio_direct_handler, 0,
 704                                        "gpio-1", pchip);
 705                 if (ret)
 706                         dev_err(&pdev->dev, "request of gpio1 irq failed: %d\n",
 707                                 ret);
 708         }
 709         ret = devm_request_irq(&pdev->dev,
 710                                irq_mux, pxa_gpio_demux_handler, 0,
 711                                        "gpio-mux", pchip);
 712         if (ret)
 713                 dev_err(&pdev->dev, "request of gpio-mux irq failed: %d\n",
 714                                 ret);
 715
 716         pxa_gpio_chip = pchip;
 717
 718         return 0;
 719 }
 720
 721 static const struct platform_device_id gpio_id_table[] = {
 722         { "pxa25x-gpio",        (unsigned long)&pxa25x_id },
 723         { "pxa26x-gpio",        (unsigned long)&pxa26x_id },
 724         { "pxa27x-gpio",        (unsigned long)&pxa27x_id },
 725         { "pxa3xx-gpio",        (unsigned long)&pxa3xx_id },
 726         { "pxa93x-gpio",        (unsigned long)&pxa93x_id },
 727         { "mmp-gpio",           (unsigned long)&mmp_id },
 728         { "mmp2-gpio",          (unsigned long)&mmp2_id },
 729         { "pxa1928-gpio",       (unsigned long)&pxa1928_id },
 730         { },
 731 };
 732
 733 static struct platform_driver pxa_gpio_driver = {
 734         .probe          = pxa_gpio_probe,
 735         .driver         = {
 736                 .name   = "pxa-gpio",
 737                 .of_match_table = of_match_ptr(pxa_gpio_dt_ids),
 738         },
 739         .id_table       = gpio_id_table,
 740 };
 741
 742 static int __init pxa_gpio_legacy_init(void)
 743 {
 744         if (of_have_populated_dt())
 745                 return 0;
 746
 747         return platform_driver_register(&pxa_gpio_driver);
 748 }
 749 postcore_initcall(pxa_gpio_legacy_init);
 750
 751 static int __init pxa_gpio_dt_init(void)
 752 {
 753         if (of_have_populated_dt())
 754                 return platform_driver_register(&pxa_gpio_driver);
 755
 756         return 0;
 757 }
 758 device_initcall(pxa_gpio_dt_init);
 759
 760 #ifdef CONFIG_PM
 761 static int pxa_gpio_suspend(void)
 762 {
 763         struct pxa_gpio_chip *pchip = pxa_gpio_chip;
 764         struct pxa_gpio_bank *c;
 765         int gpio;
 766
 767         for_each_gpio_bank(gpio, c, pchip) {
 768                 c->saved_gplr = readl_relaxed(c->regbase + GPLR_OFFSET);
 769                 c->saved_gpdr = readl_relaxed(c->regbase + GPDR_OFFSET);
 770                 c->saved_grer = readl_relaxed(c->regbase + GRER_OFFSET);
 771                 c->saved_gfer = readl_relaxed(c->regbase + GFER_OFFSET);
 772
 773                 /* Clear GPIO transition detect bits */
 774                 writel_relaxed(0xffffffff, c->regbase + GEDR_OFFSET);
 775         }
 776         return 0;
 777 }
 778
 779 static void pxa_gpio_resume(void)
 780 {
 781         struct pxa_gpio_chip *pchip = pxa_gpio_chip;
 782         struct pxa_gpio_bank *c;
 783         int gpio;
 784
 785         for_each_gpio_bank(gpio, c, pchip) {
 786                 /* restore level with set/clear */
 787                 writel_relaxed(c->saved_gplr, c->regbase + GPSR_OFFSET);
 788                 writel_relaxed(~c->saved_gplr, c->regbase + GPCR_OFFSET);
 789
 790                 writel_relaxed(c->saved_grer, c->regbase + GRER_OFFSET);
 791                 writel_relaxed(c->saved_gfer, c->regbase + GFER_OFFSET);
 792                 writel_relaxed(c->saved_gpdr, c->regbase + GPDR_OFFSET);
 793         }
 794 }
 795 #else
 796 #define pxa_gpio_suspend        NULL
 797 #define pxa_gpio_resume         NULL
 798 #endif
 799
 800 struct syscore_ops pxa_gpio_syscore_ops = {
 801         .suspend        = pxa_gpio_suspend,
 802         .resume         = pxa_gpio_resume,
 803 };
 804
 805 static int __init pxa_gpio_sysinit(void)
 806 {
 807         register_syscore_ops(&pxa_gpio_syscore_ops);
 808         return 0;
 809 }
 810 postcore_initcall(pxa_gpio_sysinit);