1 /* 2 * Copyright (c) 2011 Jamie Iles 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License version 2 as 6 * published by the Free Software Foundation. 7 * 8 * All enquiries to support@picochip.com 9 */ 10 #include <linux/acpi.h> 11 #include <linux/gpio/driver.h> 12 /* FIXME: for gpio_get_value(), replace this with direct register read */ 13 #include <linux/gpio.h> 14 #include <linux/err.h> 15 #include <linux/init.h> 16 #include <linux/interrupt.h> 17 #include <linux/io.h> 18 #include <linux/ioport.h> 19 #include <linux/irq.h> 20 #include <linux/irqdomain.h> 21 #include <linux/module.h> 22 #include <linux/of.h> 23 #include <linux/of_address.h> 24 #include <linux/of_device.h> 25 #include <linux/of_irq.h> 26 #include <linux/platform_device.h> 27 #include <linux/property.h> 28 #include <linux/spinlock.h> 29 #include <linux/platform_data/gpio-dwapb.h> 30 #include <linux/slab.h> 31 32 #include "gpiolib.h" 33 34 #define GPIO_SWPORTA_DR 0x00 35 #define GPIO_SWPORTA_DDR 0x04 36 #define GPIO_SWPORTB_DR 0x0c 37 #define GPIO_SWPORTB_DDR 0x10 38 #define GPIO_SWPORTC_DR 0x18 39 #define GPIO_SWPORTC_DDR 0x1c 40 #define GPIO_SWPORTD_DR 0x24 41 #define GPIO_SWPORTD_DDR 0x28 42 #define GPIO_INTEN 0x30 43 #define GPIO_INTMASK 0x34 44 #define GPIO_INTTYPE_LEVEL 0x38 45 #define GPIO_INT_POLARITY 0x3c 46 #define GPIO_INTSTATUS 0x40 47 #define GPIO_PORTA_DEBOUNCE 0x48 48 #define GPIO_PORTA_EOI 0x4c 49 #define GPIO_EXT_PORTA 0x50 50 #define GPIO_EXT_PORTB 0x54 51 #define GPIO_EXT_PORTC 0x58 52 #define GPIO_EXT_PORTD 0x5c 53 54 #define DWAPB_MAX_PORTS 4 55 #define GPIO_EXT_PORT_SIZE (GPIO_EXT_PORTB - GPIO_EXT_PORTA) 56 #define GPIO_SWPORT_DR_SIZE (GPIO_SWPORTB_DR - GPIO_SWPORTA_DR) 57 #define GPIO_SWPORT_DDR_SIZE (GPIO_SWPORTB_DDR - GPIO_SWPORTA_DDR) 58 59 #define GPIO_REG_OFFSET_V2 1 60 61 #define GPIO_INTMASK_V2 0x44 62 #define GPIO_INTTYPE_LEVEL_V2 0x34 63 #define GPIO_INT_POLARITY_V2 0x38 64 #define GPIO_INTSTATUS_V2 0x3c 65 #define GPIO_PORTA_EOI_V2 0x40 66 67 struct dwapb_gpio; 68 69 #ifdef CONFIG_PM_SLEEP 70 /* Store GPIO context across system-wide suspend/resume transitions */ 71 struct dwapb_context { 72 u32 data; 73 u32 dir; 74 u32 ext; 75 u32 int_en; 76 u32 int_mask; 77 u32 int_type; 78 u32 int_pol; 79 u32 int_deb; 80 }; 81 #endif 82 83 struct dwapb_gpio_port { 84 struct gpio_chip gc; 85 bool is_registered; 86 struct dwapb_gpio *gpio; 87 #ifdef CONFIG_PM_SLEEP 88 struct dwapb_context *ctx; 89 #endif 90 unsigned int idx; 91 }; 92 93 struct dwapb_gpio { 94 struct device *dev; 95 void __iomem *regs; 96 struct dwapb_gpio_port *ports; 97 unsigned int nr_ports; 98 struct irq_domain *domain; 99 unsigned int flags; 100 }; 101 102 static inline u32 gpio_reg_v2_convert(unsigned int offset) 103 { 104 switch (offset) { 105 case GPIO_INTMASK: 106 return GPIO_INTMASK_V2; 107 case GPIO_INTTYPE_LEVEL: 108 return GPIO_INTTYPE_LEVEL_V2; 109 case GPIO_INT_POLARITY: 110 return GPIO_INT_POLARITY_V2; 111 case GPIO_INTSTATUS: 112 return GPIO_INTSTATUS_V2; 113 case GPIO_PORTA_EOI: 114 return GPIO_PORTA_EOI_V2; 115 } 116 117 return offset; 118 } 119 120 static inline u32 gpio_reg_convert(struct dwapb_gpio *gpio, unsigned int offset) 121 { 122 if (gpio->flags & GPIO_REG_OFFSET_V2) 123 return gpio_reg_v2_convert(offset); 124 125 return offset; 126 } 127 128 static inline u32 dwapb_read(struct dwapb_gpio *gpio, unsigned int offset) 129 { 130 struct gpio_chip *gc = &gpio->ports[0].gc; 131 void __iomem *reg_base = gpio->regs; 132 133 return gc->read_reg(reg_base + gpio_reg_convert(gpio, offset)); 134 } 135 136 static inline void dwapb_write(struct dwapb_gpio *gpio, unsigned int offset, 137 u32 val) 138 { 139 struct gpio_chip *gc = &gpio->ports[0].gc; 140 void __iomem *reg_base = gpio->regs; 141 142 gc->write_reg(reg_base + gpio_reg_convert(gpio, offset), val); 143 } 144 145 static int dwapb_gpio_to_irq(struct gpio_chip *gc, unsigned offset) 146 { 147 struct dwapb_gpio_port *port = gpiochip_get_data(gc); 148 struct dwapb_gpio *gpio = port->gpio; 149 150 return irq_find_mapping(gpio->domain, offset); 151 } 152 153 static void dwapb_toggle_trigger(struct dwapb_gpio *gpio, unsigned int offs) 154 { 155 u32 v = dwapb_read(gpio, GPIO_INT_POLARITY); 156 157 if (gpio_get_value(gpio->ports[0].gc.base + offs)) 158 v &= ~BIT(offs); 159 else 160 v |= BIT(offs); 161 162 dwapb_write(gpio, GPIO_INT_POLARITY, v); 163 } 164 165 static u32 dwapb_do_irq(struct dwapb_gpio *gpio) 166 { 167 u32 irq_status = dwapb_read(gpio, GPIO_INTSTATUS); 168 u32 ret = irq_status; 169 170 while (irq_status) { 171 int hwirq = fls(irq_status) - 1; 172 int gpio_irq = irq_find_mapping(gpio->domain, hwirq); 173 174 generic_handle_irq(gpio_irq); 175 irq_status &= ~BIT(hwirq); 176 177 if ((irq_get_trigger_type(gpio_irq) & IRQ_TYPE_SENSE_MASK) 178 == IRQ_TYPE_EDGE_BOTH) 179 dwapb_toggle_trigger(gpio, hwirq); 180 } 181 182 return ret; 183 } 184 185 static void dwapb_irq_handler(struct irq_desc *desc) 186 { 187 struct dwapb_gpio *gpio = irq_desc_get_handler_data(desc); 188 struct irq_chip *chip = irq_desc_get_chip(desc); 189 190 dwapb_do_irq(gpio); 191 192 if (chip->irq_eoi) 193 chip->irq_eoi(irq_desc_get_irq_data(desc)); 194 } 195 196 static void dwapb_irq_enable(struct irq_data *d) 197 { 198 struct irq_chip_generic *igc = irq_data_get_irq_chip_data(d); 199 struct dwapb_gpio *gpio = igc->private; 200 struct gpio_chip *gc = &gpio->ports[0].gc; 201 unsigned long flags; 202 u32 val; 203 204 spin_lock_irqsave(&gc->bgpio_lock, flags); 205 val = dwapb_read(gpio, GPIO_INTEN); 206 val |= BIT(d->hwirq); 207 dwapb_write(gpio, GPIO_INTEN, val); 208 spin_unlock_irqrestore(&gc->bgpio_lock, flags); 209 } 210 211 static void dwapb_irq_disable(struct irq_data *d) 212 { 213 struct irq_chip_generic *igc = irq_data_get_irq_chip_data(d); 214 struct dwapb_gpio *gpio = igc->private; 215 struct gpio_chip *gc = &gpio->ports[0].gc; 216 unsigned long flags; 217 u32 val; 218 219 spin_lock_irqsave(&gc->bgpio_lock, flags); 220 val = dwapb_read(gpio, GPIO_INTEN); 221 val &= ~BIT(d->hwirq); 222 dwapb_write(gpio, GPIO_INTEN, val); 223 spin_unlock_irqrestore(&gc->bgpio_lock, flags); 224 } 225 226 static int dwapb_irq_reqres(struct irq_data *d) 227 { 228 struct irq_chip_generic *igc = irq_data_get_irq_chip_data(d); 229 struct dwapb_gpio *gpio = igc->private; 230 struct gpio_chip *gc = &gpio->ports[0].gc; 231 232 if (gpiochip_lock_as_irq(gc, irqd_to_hwirq(d))) { 233 dev_err(gpio->dev, "unable to lock HW IRQ %lu for IRQ\n", 234 irqd_to_hwirq(d)); 235 return -EINVAL; 236 } 237 return 0; 238 } 239 240 static void dwapb_irq_relres(struct irq_data *d) 241 { 242 struct irq_chip_generic *igc = irq_data_get_irq_chip_data(d); 243 struct dwapb_gpio *gpio = igc->private; 244 struct gpio_chip *gc = &gpio->ports[0].gc; 245 246 gpiochip_unlock_as_irq(gc, irqd_to_hwirq(d)); 247 } 248 249 static int dwapb_irq_set_type(struct irq_data *d, u32 type) 250 { 251 struct irq_chip_generic *igc = irq_data_get_irq_chip_data(d); 252 struct dwapb_gpio *gpio = igc->private; 253 struct gpio_chip *gc = &gpio->ports[0].gc; 254 int bit = d->hwirq; 255 unsigned long level, polarity, flags; 256 257 if (type & ~(IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING | 258 IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW)) 259 return -EINVAL; 260 261 spin_lock_irqsave(&gc->bgpio_lock, flags); 262 level = dwapb_read(gpio, GPIO_INTTYPE_LEVEL); 263 polarity = dwapb_read(gpio, GPIO_INT_POLARITY); 264 265 switch (type) { 266 case IRQ_TYPE_EDGE_BOTH: 267 level |= BIT(bit); 268 dwapb_toggle_trigger(gpio, bit); 269 break; 270 case IRQ_TYPE_EDGE_RISING: 271 level |= BIT(bit); 272 polarity |= BIT(bit); 273 break; 274 case IRQ_TYPE_EDGE_FALLING: 275 level |= BIT(bit); 276 polarity &= ~BIT(bit); 277 break; 278 case IRQ_TYPE_LEVEL_HIGH: 279 level &= ~BIT(bit); 280 polarity |= BIT(bit); 281 break; 282 case IRQ_TYPE_LEVEL_LOW: 283 level &= ~BIT(bit); 284 polarity &= ~BIT(bit); 285 break; 286 } 287 288 irq_setup_alt_chip(d, type); 289 290 dwapb_write(gpio, GPIO_INTTYPE_LEVEL, level); 291 dwapb_write(gpio, GPIO_INT_POLARITY, polarity); 292 spin_unlock_irqrestore(&gc->bgpio_lock, flags); 293 294 return 0; 295 } 296 297 static int dwapb_gpio_set_debounce(struct gpio_chip *gc, 298 unsigned offset, unsigned debounce) 299 { 300 struct dwapb_gpio_port *port = gpiochip_get_data(gc); 301 struct dwapb_gpio *gpio = port->gpio; 302 unsigned long flags, val_deb; 303 unsigned long mask = gc->pin2mask(gc, offset); 304 305 spin_lock_irqsave(&gc->bgpio_lock, flags); 306 307 val_deb = dwapb_read(gpio, GPIO_PORTA_DEBOUNCE); 308 if (debounce) 309 dwapb_write(gpio, GPIO_PORTA_DEBOUNCE, val_deb | mask); 310 else 311 dwapb_write(gpio, GPIO_PORTA_DEBOUNCE, val_deb & ~mask); 312 313 spin_unlock_irqrestore(&gc->bgpio_lock, flags); 314 315 return 0; 316 } 317 318 static int dwapb_gpio_set_config(struct gpio_chip *gc, unsigned offset, 319 unsigned long config) 320 { 321 u32 debounce; 322 323 if (pinconf_to_config_param(config) != PIN_CONFIG_INPUT_DEBOUNCE) 324 return -ENOTSUPP; 325 326 debounce = pinconf_to_config_argument(config); 327 return dwapb_gpio_set_debounce(gc, offset, debounce); 328 } 329 330 static irqreturn_t dwapb_irq_handler_mfd(int irq, void *dev_id) 331 { 332 u32 worked; 333 struct dwapb_gpio *gpio = dev_id; 334 335 worked = dwapb_do_irq(gpio); 336 337 return worked ? IRQ_HANDLED : IRQ_NONE; 338 } 339 340 static void dwapb_configure_irqs(struct dwapb_gpio *gpio, 341 struct dwapb_gpio_port *port, 342 struct dwapb_port_property *pp) 343 { 344 struct gpio_chip *gc = &port->gc; 345 struct fwnode_handle *fwnode = pp->fwnode; 346 struct irq_chip_generic *irq_gc = NULL; 347 unsigned int hwirq, ngpio = gc->ngpio; 348 struct irq_chip_type *ct; 349 int err, i; 350 351 gpio->domain = irq_domain_create_linear(fwnode, ngpio, 352 &irq_generic_chip_ops, gpio); 353 if (!gpio->domain) 354 return; 355 356 err = irq_alloc_domain_generic_chips(gpio->domain, ngpio, 2, 357 "gpio-dwapb", handle_level_irq, 358 IRQ_NOREQUEST, 0, 359 IRQ_GC_INIT_NESTED_LOCK); 360 if (err) { 361 dev_info(gpio->dev, "irq_alloc_domain_generic_chips failed\n"); 362 irq_domain_remove(gpio->domain); 363 gpio->domain = NULL; 364 return; 365 } 366 367 irq_gc = irq_get_domain_generic_chip(gpio->domain, 0); 368 if (!irq_gc) { 369 irq_domain_remove(gpio->domain); 370 gpio->domain = NULL; 371 return; 372 } 373 374 irq_gc->reg_base = gpio->regs; 375 irq_gc->private = gpio; 376 377 for (i = 0; i < 2; i++) { 378 ct = &irq_gc->chip_types[i]; 379 ct->chip.irq_ack = irq_gc_ack_set_bit; 380 ct->chip.irq_mask = irq_gc_mask_set_bit; 381 ct->chip.irq_unmask = irq_gc_mask_clr_bit; 382 ct->chip.irq_set_type = dwapb_irq_set_type; 383 ct->chip.irq_enable = dwapb_irq_enable; 384 ct->chip.irq_disable = dwapb_irq_disable; 385 ct->chip.irq_request_resources = dwapb_irq_reqres; 386 ct->chip.irq_release_resources = dwapb_irq_relres; 387 ct->regs.ack = gpio_reg_convert(gpio, GPIO_PORTA_EOI); 388 ct->regs.mask = gpio_reg_convert(gpio, GPIO_INTMASK); 389 ct->type = IRQ_TYPE_LEVEL_MASK; 390 } 391 392 irq_gc->chip_types[0].type = IRQ_TYPE_LEVEL_MASK; 393 irq_gc->chip_types[1].type = IRQ_TYPE_EDGE_BOTH; 394 irq_gc->chip_types[1].handler = handle_edge_irq; 395 396 if (!pp->irq_shared) { 397 irq_set_chained_handler_and_data(pp->irq, dwapb_irq_handler, 398 gpio); 399 } else { 400 /* 401 * Request a shared IRQ since where MFD would have devices 402 * using the same irq pin 403 */ 404 err = devm_request_irq(gpio->dev, pp->irq, 405 dwapb_irq_handler_mfd, 406 IRQF_SHARED, "gpio-dwapb-mfd", gpio); 407 if (err) { 408 dev_err(gpio->dev, "error requesting IRQ\n"); 409 irq_domain_remove(gpio->domain); 410 gpio->domain = NULL; 411 return; 412 } 413 } 414 415 for (hwirq = 0 ; hwirq < ngpio ; hwirq++) 416 irq_create_mapping(gpio->domain, hwirq); 417 418 port->gc.to_irq = dwapb_gpio_to_irq; 419 } 420 421 static void dwapb_irq_teardown(struct dwapb_gpio *gpio) 422 { 423 struct dwapb_gpio_port *port = &gpio->ports[0]; 424 struct gpio_chip *gc = &port->gc; 425 unsigned int ngpio = gc->ngpio; 426 irq_hw_number_t hwirq; 427 428 if (!gpio->domain) 429 return; 430 431 for (hwirq = 0 ; hwirq < ngpio ; hwirq++) 432 irq_dispose_mapping(irq_find_mapping(gpio->domain, hwirq)); 433 434 irq_domain_remove(gpio->domain); 435 gpio->domain = NULL; 436 } 437 438 static int dwapb_gpio_add_port(struct dwapb_gpio *gpio, 439 struct dwapb_port_property *pp, 440 unsigned int offs) 441 { 442 struct dwapb_gpio_port *port; 443 void __iomem *dat, *set, *dirout; 444 int err; 445 446 port = &gpio->ports[offs]; 447 port->gpio = gpio; 448 port->idx = pp->idx; 449 450 #ifdef CONFIG_PM_SLEEP 451 port->ctx = devm_kzalloc(gpio->dev, sizeof(*port->ctx), GFP_KERNEL); 452 if (!port->ctx) 453 return -ENOMEM; 454 #endif 455 456 dat = gpio->regs + GPIO_EXT_PORTA + (pp->idx * GPIO_EXT_PORT_SIZE); 457 set = gpio->regs + GPIO_SWPORTA_DR + (pp->idx * GPIO_SWPORT_DR_SIZE); 458 dirout = gpio->regs + GPIO_SWPORTA_DDR + 459 (pp->idx * GPIO_SWPORT_DDR_SIZE); 460 461 err = bgpio_init(&port->gc, gpio->dev, 4, dat, set, NULL, dirout, 462 NULL, false); 463 if (err) { 464 dev_err(gpio->dev, "failed to init gpio chip for port%d\n", 465 port->idx); 466 return err; 467 } 468 469 #ifdef CONFIG_OF_GPIO 470 port->gc.of_node = to_of_node(pp->fwnode); 471 #endif 472 port->gc.ngpio = pp->ngpio; 473 port->gc.base = pp->gpio_base; 474 475 /* Only port A support debounce */ 476 if (pp->idx == 0) 477 port->gc.set_config = dwapb_gpio_set_config; 478 479 if (pp->irq) 480 dwapb_configure_irqs(gpio, port, pp); 481 482 err = gpiochip_add_data(&port->gc, port); 483 if (err) 484 dev_err(gpio->dev, "failed to register gpiochip for port%d\n", 485 port->idx); 486 else 487 port->is_registered = true; 488 489 /* Add GPIO-signaled ACPI event support */ 490 if (pp->irq) 491 acpi_gpiochip_request_interrupts(&port->gc); 492 493 return err; 494 } 495 496 static void dwapb_gpio_unregister(struct dwapb_gpio *gpio) 497 { 498 unsigned int m; 499 500 for (m = 0; m < gpio->nr_ports; ++m) 501 if (gpio->ports[m].is_registered) 502 gpiochip_remove(&gpio->ports[m].gc); 503 } 504 505 static struct dwapb_platform_data * 506 dwapb_gpio_get_pdata(struct device *dev) 507 { 508 struct fwnode_handle *fwnode; 509 struct dwapb_platform_data *pdata; 510 struct dwapb_port_property *pp; 511 int nports; 512 int i; 513 514 nports = device_get_child_node_count(dev); 515 if (nports == 0) 516 return ERR_PTR(-ENODEV); 517 518 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); 519 if (!pdata) 520 return ERR_PTR(-ENOMEM); 521 522 pdata->properties = devm_kcalloc(dev, nports, sizeof(*pp), GFP_KERNEL); 523 if (!pdata->properties) 524 return ERR_PTR(-ENOMEM); 525 526 pdata->nports = nports; 527 528 i = 0; 529 device_for_each_child_node(dev, fwnode) { 530 pp = &pdata->properties[i++]; 531 pp->fwnode = fwnode; 532 533 if (fwnode_property_read_u32(fwnode, "reg", &pp->idx) || 534 pp->idx >= DWAPB_MAX_PORTS) { 535 dev_err(dev, 536 "missing/invalid port index for port%d\n", i); 537 fwnode_handle_put(fwnode); 538 return ERR_PTR(-EINVAL); 539 } 540 541 if (fwnode_property_read_u32(fwnode, "snps,nr-gpios", 542 &pp->ngpio)) { 543 dev_info(dev, 544 "failed to get number of gpios for port%d\n", 545 i); 546 pp->ngpio = 32; 547 } 548 549 /* 550 * Only port A can provide interrupts in all configurations of 551 * the IP. 552 */ 553 if (dev->of_node && pp->idx == 0 && 554 fwnode_property_read_bool(fwnode, 555 "interrupt-controller")) { 556 pp->irq = irq_of_parse_and_map(to_of_node(fwnode), 0); 557 if (!pp->irq) 558 dev_warn(dev, "no irq for port%d\n", pp->idx); 559 } 560 561 if (has_acpi_companion(dev) && pp->idx == 0) 562 pp->irq = platform_get_irq(to_platform_device(dev), 0); 563 564 pp->irq_shared = false; 565 pp->gpio_base = -1; 566 } 567 568 return pdata; 569 } 570 571 static const struct of_device_id dwapb_of_match[] = { 572 { .compatible = "snps,dw-apb-gpio", .data = (void *)0}, 573 { .compatible = "apm,xgene-gpio-v2", .data = (void *)GPIO_REG_OFFSET_V2}, 574 { /* Sentinel */ } 575 }; 576 MODULE_DEVICE_TABLE(of, dwapb_of_match); 577 578 static const struct acpi_device_id dwapb_acpi_match[] = { 579 {"HISI0181", 0}, 580 {"APMC0D07", 0}, 581 {"APMC0D81", GPIO_REG_OFFSET_V2}, 582 { } 583 }; 584 MODULE_DEVICE_TABLE(acpi, dwapb_acpi_match); 585 586 static int dwapb_gpio_probe(struct platform_device *pdev) 587 { 588 unsigned int i; 589 struct resource *res; 590 struct dwapb_gpio *gpio; 591 int err; 592 struct device *dev = &pdev->dev; 593 struct dwapb_platform_data *pdata = dev_get_platdata(dev); 594 595 if (!pdata) { 596 pdata = dwapb_gpio_get_pdata(dev); 597 if (IS_ERR(pdata)) 598 return PTR_ERR(pdata); 599 } 600 601 if (!pdata->nports) 602 return -ENODEV; 603 604 gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL); 605 if (!gpio) 606 return -ENOMEM; 607 608 gpio->dev = &pdev->dev; 609 gpio->nr_ports = pdata->nports; 610 611 gpio->ports = devm_kcalloc(&pdev->dev, gpio->nr_ports, 612 sizeof(*gpio->ports), GFP_KERNEL); 613 if (!gpio->ports) 614 return -ENOMEM; 615 616 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 617 gpio->regs = devm_ioremap_resource(&pdev->dev, res); 618 if (IS_ERR(gpio->regs)) 619 return PTR_ERR(gpio->regs); 620 621 gpio->flags = 0; 622 if (dev->of_node) { 623 const struct of_device_id *of_devid; 624 625 of_devid = of_match_device(dwapb_of_match, dev); 626 if (of_devid) { 627 if (of_devid->data) 628 gpio->flags = (uintptr_t)of_devid->data; 629 } 630 } else if (has_acpi_companion(dev)) { 631 const struct acpi_device_id *acpi_id; 632 633 acpi_id = acpi_match_device(dwapb_acpi_match, dev); 634 if (acpi_id) { 635 if (acpi_id->driver_data) 636 gpio->flags = acpi_id->driver_data; 637 } 638 } 639 640 for (i = 0; i < gpio->nr_ports; i++) { 641 err = dwapb_gpio_add_port(gpio, &pdata->properties[i], i); 642 if (err) 643 goto out_unregister; 644 } 645 platform_set_drvdata(pdev, gpio); 646 647 return 0; 648 649 out_unregister: 650 dwapb_gpio_unregister(gpio); 651 dwapb_irq_teardown(gpio); 652 653 return err; 654 } 655 656 static int dwapb_gpio_remove(struct platform_device *pdev) 657 { 658 struct dwapb_gpio *gpio = platform_get_drvdata(pdev); 659 660 dwapb_gpio_unregister(gpio); 661 dwapb_irq_teardown(gpio); 662 663 return 0; 664 } 665 666 #ifdef CONFIG_PM_SLEEP 667 static int dwapb_gpio_suspend(struct device *dev) 668 { 669 struct platform_device *pdev = to_platform_device(dev); 670 struct dwapb_gpio *gpio = platform_get_drvdata(pdev); 671 struct gpio_chip *gc = &gpio->ports[0].gc; 672 unsigned long flags; 673 int i; 674 675 spin_lock_irqsave(&gc->bgpio_lock, flags); 676 for (i = 0; i < gpio->nr_ports; i++) { 677 unsigned int offset; 678 unsigned int idx = gpio->ports[i].idx; 679 struct dwapb_context *ctx = gpio->ports[i].ctx; 680 681 BUG_ON(!ctx); 682 683 offset = GPIO_SWPORTA_DDR + idx * GPIO_SWPORT_DDR_SIZE; 684 ctx->dir = dwapb_read(gpio, offset); 685 686 offset = GPIO_SWPORTA_DR + idx * GPIO_SWPORT_DR_SIZE; 687 ctx->data = dwapb_read(gpio, offset); 688 689 offset = GPIO_EXT_PORTA + idx * GPIO_EXT_PORT_SIZE; 690 ctx->ext = dwapb_read(gpio, offset); 691 692 /* Only port A can provide interrupts */ 693 if (idx == 0) { 694 ctx->int_mask = dwapb_read(gpio, GPIO_INTMASK); 695 ctx->int_en = dwapb_read(gpio, GPIO_INTEN); 696 ctx->int_pol = dwapb_read(gpio, GPIO_INT_POLARITY); 697 ctx->int_type = dwapb_read(gpio, GPIO_INTTYPE_LEVEL); 698 ctx->int_deb = dwapb_read(gpio, GPIO_PORTA_DEBOUNCE); 699 700 /* Mask out interrupts */ 701 dwapb_write(gpio, GPIO_INTMASK, 0xffffffff); 702 } 703 } 704 spin_unlock_irqrestore(&gc->bgpio_lock, flags); 705 706 return 0; 707 } 708 709 static int dwapb_gpio_resume(struct device *dev) 710 { 711 struct platform_device *pdev = to_platform_device(dev); 712 struct dwapb_gpio *gpio = platform_get_drvdata(pdev); 713 struct gpio_chip *gc = &gpio->ports[0].gc; 714 unsigned long flags; 715 int i; 716 717 spin_lock_irqsave(&gc->bgpio_lock, flags); 718 for (i = 0; i < gpio->nr_ports; i++) { 719 unsigned int offset; 720 unsigned int idx = gpio->ports[i].idx; 721 struct dwapb_context *ctx = gpio->ports[i].ctx; 722 723 BUG_ON(!ctx); 724 725 offset = GPIO_SWPORTA_DR + idx * GPIO_SWPORT_DR_SIZE; 726 dwapb_write(gpio, offset, ctx->data); 727 728 offset = GPIO_SWPORTA_DDR + idx * GPIO_SWPORT_DDR_SIZE; 729 dwapb_write(gpio, offset, ctx->dir); 730 731 offset = GPIO_EXT_PORTA + idx * GPIO_EXT_PORT_SIZE; 732 dwapb_write(gpio, offset, ctx->ext); 733 734 /* Only port A can provide interrupts */ 735 if (idx == 0) { 736 dwapb_write(gpio, GPIO_INTTYPE_LEVEL, ctx->int_type); 737 dwapb_write(gpio, GPIO_INT_POLARITY, ctx->int_pol); 738 dwapb_write(gpio, GPIO_PORTA_DEBOUNCE, ctx->int_deb); 739 dwapb_write(gpio, GPIO_INTEN, ctx->int_en); 740 dwapb_write(gpio, GPIO_INTMASK, ctx->int_mask); 741 742 /* Clear out spurious interrupts */ 743 dwapb_write(gpio, GPIO_PORTA_EOI, 0xffffffff); 744 } 745 } 746 spin_unlock_irqrestore(&gc->bgpio_lock, flags); 747 748 return 0; 749 } 750 #endif 751 752 static SIMPLE_DEV_PM_OPS(dwapb_gpio_pm_ops, dwapb_gpio_suspend, 753 dwapb_gpio_resume); 754 755 static struct platform_driver dwapb_gpio_driver = { 756 .driver = { 757 .name = "gpio-dwapb", 758 .pm = &dwapb_gpio_pm_ops, 759 .of_match_table = of_match_ptr(dwapb_of_match), 760 .acpi_match_table = ACPI_PTR(dwapb_acpi_match), 761 }, 762 .probe = dwapb_gpio_probe, 763 .remove = dwapb_gpio_remove, 764 }; 765 766 module_platform_driver(dwapb_gpio_driver); 767 768 MODULE_LICENSE("GPL"); 769 MODULE_AUTHOR("Jamie Iles"); 770 MODULE_DESCRIPTION("Synopsys DesignWare APB GPIO driver"); 771