1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * linux/arch/arm/plat-pxa/gpio.c 4 * 5 * Generic PXA GPIO handling 6 * 7 * Author: Nicolas Pitre 8 * Created: Jun 15, 2001 9 * Copyright: MontaVista Software Inc. 10 */ 11 #include <linux/module.h> 12 #include <linux/clk.h> 13 #include <linux/err.h> 14 #include <linux/gpio/driver.h> 15 #include <linux/gpio-pxa.h> 16 #include <linux/init.h> 17 #include <linux/interrupt.h> 18 #include <linux/irq.h> 19 #include <linux/irqdomain.h> 20 #include <linux/irqchip/chained_irq.h> 21 #include <linux/io.h> 22 #include <linux/of.h> 23 #include <linux/pinctrl/consumer.h> 24 #include <linux/platform_device.h> 25 #include <linux/syscore_ops.h> 26 #include <linux/slab.h> 27 28 /* 29 * We handle the GPIOs by banks, each bank covers up to 32 GPIOs with 30 * one set of registers. The register offsets are organized below: 31 * 32 * GPLR GPDR GPSR GPCR GRER GFER GEDR 33 * BANK 0 - 0x0000 0x000C 0x0018 0x0024 0x0030 0x003C 0x0048 34 * BANK 1 - 0x0004 0x0010 0x001C 0x0028 0x0034 0x0040 0x004C 35 * BANK 2 - 0x0008 0x0014 0x0020 0x002C 0x0038 0x0044 0x0050 36 * 37 * BANK 3 - 0x0100 0x010C 0x0118 0x0124 0x0130 0x013C 0x0148 38 * BANK 4 - 0x0104 0x0110 0x011C 0x0128 0x0134 0x0140 0x014C 39 * BANK 5 - 0x0108 0x0114 0x0120 0x012C 0x0138 0x0144 0x0150 40 * 41 * BANK 6 - 0x0200 0x020C 0x0218 0x0224 0x0230 0x023C 0x0248 42 * 43 * NOTE: 44 * BANK 3 is only available on PXA27x and later processors. 45 * BANK 4 and 5 are only available on PXA935, PXA1928 46 * BANK 6 is only available on PXA1928 47 */ 48 49 #define GPLR_OFFSET 0x00 50 #define GPDR_OFFSET 0x0C 51 #define GPSR_OFFSET 0x18 52 #define GPCR_OFFSET 0x24 53 #define GRER_OFFSET 0x30 54 #define GFER_OFFSET 0x3C 55 #define GEDR_OFFSET 0x48 56 #define GAFR_OFFSET 0x54 57 #define ED_MASK_OFFSET 0x9C /* GPIO edge detection for AP side */ 58 59 #define BANK_OFF(n) (((n) / 3) << 8) + (((n) % 3) << 2) 60 61 int pxa_last_gpio; 62 static int irq_base; 63 64 struct pxa_gpio_bank { 65 void __iomem *regbase; 66 unsigned long irq_mask; 67 unsigned long irq_edge_rise; 68 unsigned long irq_edge_fall; 69 70 #ifdef CONFIG_PM 71 unsigned long saved_gplr; 72 unsigned long saved_gpdr; 73 unsigned long saved_grer; 74 unsigned long saved_gfer; 75 #endif 76 }; 77 78 struct pxa_gpio_chip { 79 struct device *dev; 80 struct gpio_chip chip; 81 struct pxa_gpio_bank *banks; 82 struct irq_domain *irqdomain; 83 84 int irq0; 85 int irq1; 86 int (*set_wake)(unsigned int gpio, unsigned int on); 87 }; 88 89 enum pxa_gpio_type { 90 PXA25X_GPIO = 0, 91 PXA26X_GPIO, 92 PXA27X_GPIO, 93 PXA3XX_GPIO, 94 PXA93X_GPIO, 95 MMP_GPIO = 0x10, 96 MMP2_GPIO, 97 PXA1928_GPIO, 98 }; 99 100 struct pxa_gpio_id { 101 enum pxa_gpio_type type; 102 int gpio_nums; 103 }; 104 105 static DEFINE_SPINLOCK(gpio_lock); 106 static struct pxa_gpio_chip *pxa_gpio_chip; 107 static enum pxa_gpio_type gpio_type; 108 109 static struct pxa_gpio_id pxa25x_id = { 110 .type = PXA25X_GPIO, 111 .gpio_nums = 85, 112 }; 113 114 static struct pxa_gpio_id pxa26x_id = { 115 .type = PXA26X_GPIO, 116 .gpio_nums = 90, 117 }; 118 119 static struct pxa_gpio_id pxa27x_id = { 120 .type = PXA27X_GPIO, 121 .gpio_nums = 121, 122 }; 123 124 static struct pxa_gpio_id pxa3xx_id = { 125 .type = PXA3XX_GPIO, 126 .gpio_nums = 128, 127 }; 128 129 static struct pxa_gpio_id pxa93x_id = { 130 .type = PXA93X_GPIO, 131 .gpio_nums = 192, 132 }; 133 134 static struct pxa_gpio_id mmp_id = { 135 .type = MMP_GPIO, 136 .gpio_nums = 128, 137 }; 138 139 static struct pxa_gpio_id mmp2_id = { 140 .type = MMP2_GPIO, 141 .gpio_nums = 192, 142 }; 143 144 static struct pxa_gpio_id pxa1928_id = { 145 .type = PXA1928_GPIO, 146 .gpio_nums = 224, 147 }; 148 149 #define for_each_gpio_bank(i, b, pc) \ 150 for (i = 0, b = pc->banks; i <= pxa_last_gpio; i += 32, b++) 151 chip_to_pxachip(struct gpio_chip * c)152 static inline struct pxa_gpio_chip *chip_to_pxachip(struct gpio_chip *c) 153 { 154 struct pxa_gpio_chip *pxa_chip = gpiochip_get_data(c); 155 156 return pxa_chip; 157 } 158 gpio_bank_base(struct gpio_chip * c,int gpio)159 static inline void __iomem *gpio_bank_base(struct gpio_chip *c, int gpio) 160 { 161 struct pxa_gpio_chip *p = gpiochip_get_data(c); 162 struct pxa_gpio_bank *bank = p->banks + (gpio / 32); 163 164 return bank->regbase; 165 } 166 gpio_to_pxabank(struct gpio_chip * c,unsigned gpio)167 static inline struct pxa_gpio_bank *gpio_to_pxabank(struct gpio_chip *c, 168 unsigned gpio) 169 { 170 return chip_to_pxachip(c)->banks + gpio / 32; 171 } 172 gpio_is_mmp_type(int type)173 static inline int gpio_is_mmp_type(int type) 174 { 175 return (type & MMP_GPIO) != 0; 176 } 177 178 /* GPIO86/87/88/89 on PXA26x have their direction bits in PXA_GPDR(2 inverted, 179 * as well as their Alternate Function value being '1' for GPIO in GAFRx. 180 */ __gpio_is_inverted(int gpio)181 static inline int __gpio_is_inverted(int gpio) 182 { 183 if ((gpio_type == PXA26X_GPIO) && (gpio > 85)) 184 return 1; 185 return 0; 186 } 187 188 /* 189 * On PXA25x and PXA27x, GAFRx and GPDRx together decide the alternate 190 * function of a GPIO, and GPDRx cannot be altered once configured. It 191 * is attributed as "occupied" here (I know this terminology isn't 192 * accurate, you are welcome to propose a better one :-) 193 */ __gpio_is_occupied(struct pxa_gpio_chip * pchip,unsigned gpio)194 static inline int __gpio_is_occupied(struct pxa_gpio_chip *pchip, unsigned gpio) 195 { 196 void __iomem *base; 197 unsigned long gafr = 0, gpdr = 0; 198 int ret, af = 0, dir = 0; 199 200 base = gpio_bank_base(&pchip->chip, gpio); 201 gpdr = readl_relaxed(base + GPDR_OFFSET); 202 203 switch (gpio_type) { 204 case PXA25X_GPIO: 205 case PXA26X_GPIO: 206 case PXA27X_GPIO: 207 gafr = readl_relaxed(base + GAFR_OFFSET); 208 af = (gafr >> ((gpio & 0xf) * 2)) & 0x3; 209 dir = gpdr & GPIO_bit(gpio); 210 211 if (__gpio_is_inverted(gpio)) 212 ret = (af != 1) || (dir == 0); 213 else 214 ret = (af != 0) || (dir != 0); 215 break; 216 default: 217 ret = gpdr & GPIO_bit(gpio); 218 break; 219 } 220 return ret; 221 } 222 pxa_irq_to_gpio(int irq)223 int pxa_irq_to_gpio(int irq) 224 { 225 struct pxa_gpio_chip *pchip = pxa_gpio_chip; 226 int irq_gpio0; 227 228 irq_gpio0 = irq_find_mapping(pchip->irqdomain, 0); 229 if (irq_gpio0 > 0) 230 return irq - irq_gpio0; 231 232 return irq_gpio0; 233 } 234 pxa_gpio_has_pinctrl(void)235 static bool pxa_gpio_has_pinctrl(void) 236 { 237 switch (gpio_type) { 238 case PXA3XX_GPIO: 239 case MMP2_GPIO: 240 case MMP_GPIO: 241 return false; 242 243 default: 244 return true; 245 } 246 } 247 pxa_gpio_to_irq(struct gpio_chip * chip,unsigned offset)248 static int pxa_gpio_to_irq(struct gpio_chip *chip, unsigned offset) 249 { 250 struct pxa_gpio_chip *pchip = chip_to_pxachip(chip); 251 252 return irq_find_mapping(pchip->irqdomain, offset); 253 } 254 pxa_gpio_direction_input(struct gpio_chip * chip,unsigned offset)255 static int pxa_gpio_direction_input(struct gpio_chip *chip, unsigned offset) 256 { 257 void __iomem *base = gpio_bank_base(chip, offset); 258 uint32_t value, mask = GPIO_bit(offset); 259 unsigned long flags; 260 int ret; 261 262 if (pxa_gpio_has_pinctrl()) { 263 ret = pinctrl_gpio_direction_input(chip, offset); 264 if (ret) 265 return ret; 266 } 267 268 spin_lock_irqsave(&gpio_lock, flags); 269 270 value = readl_relaxed(base + GPDR_OFFSET); 271 if (__gpio_is_inverted(chip->base + offset)) 272 value |= mask; 273 else 274 value &= ~mask; 275 writel_relaxed(value, base + GPDR_OFFSET); 276 277 spin_unlock_irqrestore(&gpio_lock, flags); 278 return 0; 279 } 280 pxa_gpio_direction_output(struct gpio_chip * chip,unsigned offset,int value)281 static int pxa_gpio_direction_output(struct gpio_chip *chip, 282 unsigned offset, int value) 283 { 284 void __iomem *base = gpio_bank_base(chip, offset); 285 uint32_t tmp, mask = GPIO_bit(offset); 286 unsigned long flags; 287 int ret; 288 289 writel_relaxed(mask, base + (value ? GPSR_OFFSET : GPCR_OFFSET)); 290 291 if (pxa_gpio_has_pinctrl()) { 292 ret = pinctrl_gpio_direction_output(chip, offset); 293 if (ret) 294 return ret; 295 } 296 297 spin_lock_irqsave(&gpio_lock, flags); 298 299 tmp = readl_relaxed(base + GPDR_OFFSET); 300 if (__gpio_is_inverted(chip->base + offset)) 301 tmp &= ~mask; 302 else 303 tmp |= mask; 304 writel_relaxed(tmp, base + GPDR_OFFSET); 305 306 spin_unlock_irqrestore(&gpio_lock, flags); 307 return 0; 308 } 309 pxa_gpio_get(struct gpio_chip * chip,unsigned offset)310 static int pxa_gpio_get(struct gpio_chip *chip, unsigned offset) 311 { 312 void __iomem *base = gpio_bank_base(chip, offset); 313 u32 gplr = readl_relaxed(base + GPLR_OFFSET); 314 315 return !!(gplr & GPIO_bit(offset)); 316 } 317 pxa_gpio_set(struct gpio_chip * chip,unsigned offset,int value)318 static void pxa_gpio_set(struct gpio_chip *chip, unsigned offset, int value) 319 { 320 void __iomem *base = gpio_bank_base(chip, offset); 321 322 writel_relaxed(GPIO_bit(offset), 323 base + (value ? GPSR_OFFSET : GPCR_OFFSET)); 324 } 325 326 #ifdef CONFIG_OF_GPIO pxa_gpio_of_xlate(struct gpio_chip * gc,const struct of_phandle_args * gpiospec,u32 * flags)327 static int pxa_gpio_of_xlate(struct gpio_chip *gc, 328 const struct of_phandle_args *gpiospec, 329 u32 *flags) 330 { 331 if (gpiospec->args[0] > pxa_last_gpio) 332 return -EINVAL; 333 334 if (flags) 335 *flags = gpiospec->args[1]; 336 337 return gpiospec->args[0]; 338 } 339 #endif 340 pxa_init_gpio_chip(struct pxa_gpio_chip * pchip,int ngpio,void __iomem * regbase)341 static int pxa_init_gpio_chip(struct pxa_gpio_chip *pchip, int ngpio, void __iomem *regbase) 342 { 343 int i, gpio, nbanks = DIV_ROUND_UP(ngpio, 32); 344 struct pxa_gpio_bank *bank; 345 346 pchip->banks = devm_kcalloc(pchip->dev, nbanks, sizeof(*pchip->banks), 347 GFP_KERNEL); 348 if (!pchip->banks) 349 return -ENOMEM; 350 351 pchip->chip.parent = pchip->dev; 352 pchip->chip.label = "gpio-pxa"; 353 pchip->chip.direction_input = pxa_gpio_direction_input; 354 pchip->chip.direction_output = pxa_gpio_direction_output; 355 pchip->chip.get = pxa_gpio_get; 356 pchip->chip.set = pxa_gpio_set; 357 pchip->chip.to_irq = pxa_gpio_to_irq; 358 pchip->chip.ngpio = ngpio; 359 pchip->chip.request = gpiochip_generic_request; 360 pchip->chip.free = gpiochip_generic_free; 361 362 #ifdef CONFIG_OF_GPIO 363 pchip->chip.of_xlate = pxa_gpio_of_xlate; 364 pchip->chip.of_gpio_n_cells = 2; 365 #endif 366 367 for (i = 0, gpio = 0; i < nbanks; i++, gpio += 32) { 368 bank = pchip->banks + i; 369 bank->regbase = regbase + BANK_OFF(i); 370 } 371 372 return gpiochip_add_data(&pchip->chip, pchip); 373 } 374 375 /* Update only those GRERx and GFERx edge detection register bits if those 376 * bits are set in c->irq_mask 377 */ update_edge_detect(struct pxa_gpio_bank * c)378 static inline void update_edge_detect(struct pxa_gpio_bank *c) 379 { 380 uint32_t grer, gfer; 381 382 grer = readl_relaxed(c->regbase + GRER_OFFSET) & ~c->irq_mask; 383 gfer = readl_relaxed(c->regbase + GFER_OFFSET) & ~c->irq_mask; 384 grer |= c->irq_edge_rise & c->irq_mask; 385 gfer |= c->irq_edge_fall & c->irq_mask; 386 writel_relaxed(grer, c->regbase + GRER_OFFSET); 387 writel_relaxed(gfer, c->regbase + GFER_OFFSET); 388 } 389 pxa_gpio_irq_type(struct irq_data * d,unsigned int type)390 static int pxa_gpio_irq_type(struct irq_data *d, unsigned int type) 391 { 392 struct pxa_gpio_chip *pchip = irq_data_get_irq_chip_data(d); 393 unsigned int gpio = irqd_to_hwirq(d); 394 struct pxa_gpio_bank *c = gpio_to_pxabank(&pchip->chip, gpio); 395 unsigned long gpdr, mask = GPIO_bit(gpio); 396 397 if (type == IRQ_TYPE_PROBE) { 398 /* Don't mess with enabled GPIOs using preconfigured edges or 399 * GPIOs set to alternate function or to output during probe 400 */ 401 if ((c->irq_edge_rise | c->irq_edge_fall) & GPIO_bit(gpio)) 402 return 0; 403 404 if (__gpio_is_occupied(pchip, gpio)) 405 return 0; 406 407 type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING; 408 } 409 410 gpdr = readl_relaxed(c->regbase + GPDR_OFFSET); 411 412 if (__gpio_is_inverted(gpio)) 413 writel_relaxed(gpdr | mask, c->regbase + GPDR_OFFSET); 414 else 415 writel_relaxed(gpdr & ~mask, c->regbase + GPDR_OFFSET); 416 417 if (type & IRQ_TYPE_EDGE_RISING) 418 c->irq_edge_rise |= mask; 419 else 420 c->irq_edge_rise &= ~mask; 421 422 if (type & IRQ_TYPE_EDGE_FALLING) 423 c->irq_edge_fall |= mask; 424 else 425 c->irq_edge_fall &= ~mask; 426 427 update_edge_detect(c); 428 429 pr_debug("%s: IRQ%d (GPIO%d) - edge%s%s\n", __func__, d->irq, gpio, 430 ((type & IRQ_TYPE_EDGE_RISING) ? " rising" : ""), 431 ((type & IRQ_TYPE_EDGE_FALLING) ? " falling" : "")); 432 return 0; 433 } 434 pxa_gpio_demux_handler(int in_irq,void * d)435 static irqreturn_t pxa_gpio_demux_handler(int in_irq, void *d) 436 { 437 int loop, gpio, n, handled = 0; 438 unsigned long gedr; 439 struct pxa_gpio_chip *pchip = d; 440 struct pxa_gpio_bank *c; 441 442 do { 443 loop = 0; 444 for_each_gpio_bank(gpio, c, pchip) { 445 gedr = readl_relaxed(c->regbase + GEDR_OFFSET); 446 gedr = gedr & c->irq_mask; 447 writel_relaxed(gedr, c->regbase + GEDR_OFFSET); 448 449 for_each_set_bit(n, &gedr, BITS_PER_LONG) { 450 loop = 1; 451 452 generic_handle_domain_irq(pchip->irqdomain, 453 gpio + n); 454 } 455 } 456 handled += loop; 457 } while (loop); 458 459 return handled ? IRQ_HANDLED : IRQ_NONE; 460 } 461 pxa_gpio_direct_handler(int in_irq,void * d)462 static irqreturn_t pxa_gpio_direct_handler(int in_irq, void *d) 463 { 464 struct pxa_gpio_chip *pchip = d; 465 466 if (in_irq == pchip->irq0) { 467 generic_handle_domain_irq(pchip->irqdomain, 0); 468 } else if (in_irq == pchip->irq1) { 469 generic_handle_domain_irq(pchip->irqdomain, 1); 470 } else { 471 pr_err("%s() unknown irq %d\n", __func__, in_irq); 472 return IRQ_NONE; 473 } 474 return IRQ_HANDLED; 475 } 476 pxa_ack_muxed_gpio(struct irq_data * d)477 static void pxa_ack_muxed_gpio(struct irq_data *d) 478 { 479 struct pxa_gpio_chip *pchip = irq_data_get_irq_chip_data(d); 480 unsigned int gpio = irqd_to_hwirq(d); 481 void __iomem *base = gpio_bank_base(&pchip->chip, gpio); 482 483 writel_relaxed(GPIO_bit(gpio), base + GEDR_OFFSET); 484 } 485 pxa_mask_muxed_gpio(struct irq_data * d)486 static void pxa_mask_muxed_gpio(struct irq_data *d) 487 { 488 struct pxa_gpio_chip *pchip = irq_data_get_irq_chip_data(d); 489 unsigned int gpio = irqd_to_hwirq(d); 490 struct pxa_gpio_bank *b = gpio_to_pxabank(&pchip->chip, gpio); 491 void __iomem *base = gpio_bank_base(&pchip->chip, gpio); 492 uint32_t grer, gfer; 493 494 b->irq_mask &= ~GPIO_bit(gpio); 495 496 grer = readl_relaxed(base + GRER_OFFSET) & ~GPIO_bit(gpio); 497 gfer = readl_relaxed(base + GFER_OFFSET) & ~GPIO_bit(gpio); 498 writel_relaxed(grer, base + GRER_OFFSET); 499 writel_relaxed(gfer, base + GFER_OFFSET); 500 } 501 pxa_gpio_set_wake(struct irq_data * d,unsigned int on)502 static int pxa_gpio_set_wake(struct irq_data *d, unsigned int on) 503 { 504 struct pxa_gpio_chip *pchip = irq_data_get_irq_chip_data(d); 505 unsigned int gpio = irqd_to_hwirq(d); 506 507 if (pchip->set_wake) 508 return pchip->set_wake(gpio, on); 509 else 510 return 0; 511 } 512 pxa_unmask_muxed_gpio(struct irq_data * d)513 static void pxa_unmask_muxed_gpio(struct irq_data *d) 514 { 515 struct pxa_gpio_chip *pchip = irq_data_get_irq_chip_data(d); 516 unsigned int gpio = irqd_to_hwirq(d); 517 struct pxa_gpio_bank *c = gpio_to_pxabank(&pchip->chip, gpio); 518 519 c->irq_mask |= GPIO_bit(gpio); 520 update_edge_detect(c); 521 } 522 523 static struct irq_chip pxa_muxed_gpio_chip = { 524 .name = "GPIO", 525 .irq_ack = pxa_ack_muxed_gpio, 526 .irq_mask = pxa_mask_muxed_gpio, 527 .irq_unmask = pxa_unmask_muxed_gpio, 528 .irq_set_type = pxa_gpio_irq_type, 529 .irq_set_wake = pxa_gpio_set_wake, 530 }; 531 pxa_gpio_nums(struct platform_device * pdev)532 static int pxa_gpio_nums(struct platform_device *pdev) 533 { 534 const struct platform_device_id *id = platform_get_device_id(pdev); 535 struct pxa_gpio_id *pxa_id = (struct pxa_gpio_id *)id->driver_data; 536 int count = 0; 537 538 switch (pxa_id->type) { 539 case PXA25X_GPIO: 540 case PXA26X_GPIO: 541 case PXA27X_GPIO: 542 case PXA3XX_GPIO: 543 case PXA93X_GPIO: 544 case MMP_GPIO: 545 case MMP2_GPIO: 546 case PXA1928_GPIO: 547 gpio_type = pxa_id->type; 548 count = pxa_id->gpio_nums - 1; 549 break; 550 default: 551 count = -EINVAL; 552 break; 553 } 554 return count; 555 } 556 pxa_irq_domain_map(struct irq_domain * d,unsigned int irq,irq_hw_number_t hw)557 static int pxa_irq_domain_map(struct irq_domain *d, unsigned int irq, 558 irq_hw_number_t hw) 559 { 560 irq_set_chip_and_handler(irq, &pxa_muxed_gpio_chip, 561 handle_edge_irq); 562 irq_set_chip_data(irq, d->host_data); 563 irq_set_noprobe(irq); 564 return 0; 565 } 566 567 static const struct irq_domain_ops pxa_irq_domain_ops = { 568 .map = pxa_irq_domain_map, 569 .xlate = irq_domain_xlate_twocell, 570 }; 571 572 #ifdef CONFIG_OF 573 static const struct of_device_id pxa_gpio_dt_ids[] = { 574 { .compatible = "intel,pxa25x-gpio", .data = &pxa25x_id, }, 575 { .compatible = "intel,pxa26x-gpio", .data = &pxa26x_id, }, 576 { .compatible = "intel,pxa27x-gpio", .data = &pxa27x_id, }, 577 { .compatible = "intel,pxa3xx-gpio", .data = &pxa3xx_id, }, 578 { .compatible = "marvell,pxa93x-gpio", .data = &pxa93x_id, }, 579 { .compatible = "marvell,mmp-gpio", .data = &mmp_id, }, 580 { .compatible = "marvell,mmp2-gpio", .data = &mmp2_id, }, 581 { .compatible = "marvell,pxa1928-gpio", .data = &pxa1928_id, }, 582 {} 583 }; 584 pxa_gpio_probe_dt(struct platform_device * pdev,struct pxa_gpio_chip * pchip)585 static int pxa_gpio_probe_dt(struct platform_device *pdev, 586 struct pxa_gpio_chip *pchip) 587 { 588 int nr_gpios; 589 const struct pxa_gpio_id *gpio_id; 590 591 gpio_id = of_device_get_match_data(&pdev->dev); 592 gpio_type = gpio_id->type; 593 594 nr_gpios = gpio_id->gpio_nums; 595 pxa_last_gpio = nr_gpios - 1; 596 597 irq_base = devm_irq_alloc_descs(&pdev->dev, -1, 0, nr_gpios, 0); 598 if (irq_base < 0) { 599 dev_err(&pdev->dev, "Failed to allocate IRQ numbers\n"); 600 return irq_base; 601 } 602 return irq_base; 603 } 604 #else 605 #define pxa_gpio_probe_dt(pdev, pchip) (-1) 606 #endif 607 pxa_gpio_probe(struct platform_device * pdev)608 static int pxa_gpio_probe(struct platform_device *pdev) 609 { 610 struct pxa_gpio_chip *pchip; 611 struct pxa_gpio_bank *c; 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; 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_optional(pdev, "gpio0"); 646 irq1 = platform_get_irq_byname_optional(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; 654 655 gpio_reg_base = devm_platform_ioremap_resource(pdev, 0); 656 if (IS_ERR(gpio_reg_base)) 657 return PTR_ERR(gpio_reg_base); 658 659 clk = devm_clk_get_enabled(&pdev->dev, NULL); 660 if (IS_ERR(clk)) { 661 dev_err(&pdev->dev, "Error %ld to get gpio clock\n", 662 PTR_ERR(clk)); 663 return PTR_ERR(clk); 664 } 665 666 /* Initialize GPIO chips */ 667 ret = pxa_init_gpio_chip(pchip, pxa_last_gpio + 1, gpio_reg_base); 668 if (ret) 669 return ret; 670 671 /* clear all GPIO edge detects */ 672 for_each_gpio_bank(gpio, c, pchip) { 673 writel_relaxed(0, c->regbase + GFER_OFFSET); 674 writel_relaxed(0, c->regbase + GRER_OFFSET); 675 writel_relaxed(~0, c->regbase + GEDR_OFFSET); 676 /* unmask GPIO edge detect for AP side */ 677 if (gpio_is_mmp_type(gpio_type)) 678 writel_relaxed(~0, c->regbase + ED_MASK_OFFSET); 679 } 680 681 if (irq0 > 0) { 682 ret = devm_request_irq(&pdev->dev, 683 irq0, pxa_gpio_direct_handler, 0, 684 "gpio-0", pchip); 685 if (ret) 686 dev_err(&pdev->dev, "request of gpio0 irq failed: %d\n", 687 ret); 688 } 689 if (irq1 > 0) { 690 ret = devm_request_irq(&pdev->dev, 691 irq1, pxa_gpio_direct_handler, 0, 692 "gpio-1", pchip); 693 if (ret) 694 dev_err(&pdev->dev, "request of gpio1 irq failed: %d\n", 695 ret); 696 } 697 ret = devm_request_irq(&pdev->dev, 698 irq_mux, pxa_gpio_demux_handler, 0, 699 "gpio-mux", pchip); 700 if (ret) 701 dev_err(&pdev->dev, "request of gpio-mux irq failed: %d\n", 702 ret); 703 704 pxa_gpio_chip = pchip; 705 706 return 0; 707 } 708 709 static const struct platform_device_id gpio_id_table[] = { 710 { "pxa25x-gpio", (unsigned long)&pxa25x_id }, 711 { "pxa26x-gpio", (unsigned long)&pxa26x_id }, 712 { "pxa27x-gpio", (unsigned long)&pxa27x_id }, 713 { "pxa3xx-gpio", (unsigned long)&pxa3xx_id }, 714 { "pxa93x-gpio", (unsigned long)&pxa93x_id }, 715 { "mmp-gpio", (unsigned long)&mmp_id }, 716 { "mmp2-gpio", (unsigned long)&mmp2_id }, 717 { "pxa1928-gpio", (unsigned long)&pxa1928_id }, 718 { }, 719 }; 720 721 static struct platform_driver pxa_gpio_driver = { 722 .probe = pxa_gpio_probe, 723 .driver = { 724 .name = "pxa-gpio", 725 .of_match_table = of_match_ptr(pxa_gpio_dt_ids), 726 }, 727 .id_table = gpio_id_table, 728 }; 729 pxa_gpio_legacy_init(void)730 static int __init pxa_gpio_legacy_init(void) 731 { 732 if (of_have_populated_dt()) 733 return 0; 734 735 return platform_driver_register(&pxa_gpio_driver); 736 } 737 postcore_initcall(pxa_gpio_legacy_init); 738 pxa_gpio_dt_init(void)739 static int __init pxa_gpio_dt_init(void) 740 { 741 if (of_have_populated_dt()) 742 return platform_driver_register(&pxa_gpio_driver); 743 744 return 0; 745 } 746 device_initcall(pxa_gpio_dt_init); 747 748 #ifdef CONFIG_PM pxa_gpio_suspend(void)749 static int pxa_gpio_suspend(void) 750 { 751 struct pxa_gpio_chip *pchip = pxa_gpio_chip; 752 struct pxa_gpio_bank *c; 753 int gpio; 754 755 if (!pchip) 756 return 0; 757 758 for_each_gpio_bank(gpio, c, pchip) { 759 c->saved_gplr = readl_relaxed(c->regbase + GPLR_OFFSET); 760 c->saved_gpdr = readl_relaxed(c->regbase + GPDR_OFFSET); 761 c->saved_grer = readl_relaxed(c->regbase + GRER_OFFSET); 762 c->saved_gfer = readl_relaxed(c->regbase + GFER_OFFSET); 763 764 /* Clear GPIO transition detect bits */ 765 writel_relaxed(0xffffffff, c->regbase + GEDR_OFFSET); 766 } 767 return 0; 768 } 769 pxa_gpio_resume(void)770 static void pxa_gpio_resume(void) 771 { 772 struct pxa_gpio_chip *pchip = pxa_gpio_chip; 773 struct pxa_gpio_bank *c; 774 int gpio; 775 776 if (!pchip) 777 return; 778 779 for_each_gpio_bank(gpio, c, pchip) { 780 /* restore level with set/clear */ 781 writel_relaxed(c->saved_gplr, c->regbase + GPSR_OFFSET); 782 writel_relaxed(~c->saved_gplr, c->regbase + GPCR_OFFSET); 783 784 writel_relaxed(c->saved_grer, c->regbase + GRER_OFFSET); 785 writel_relaxed(c->saved_gfer, c->regbase + GFER_OFFSET); 786 writel_relaxed(c->saved_gpdr, c->regbase + GPDR_OFFSET); 787 } 788 } 789 #else 790 #define pxa_gpio_suspend NULL 791 #define pxa_gpio_resume NULL 792 #endif 793 794 static struct syscore_ops pxa_gpio_syscore_ops = { 795 .suspend = pxa_gpio_suspend, 796 .resume = pxa_gpio_resume, 797 }; 798 pxa_gpio_sysinit(void)799 static int __init pxa_gpio_sysinit(void) 800 { 801 register_syscore_ops(&pxa_gpio_syscore_ops); 802 return 0; 803 } 804 postcore_initcall(pxa_gpio_sysinit); 805