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