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/basic_mmio_gpio.h> 11 #include <linux/err.h> 12 #include <linux/init.h> 13 #include <linux/interrupt.h> 14 #include <linux/io.h> 15 #include <linux/ioport.h> 16 #include <linux/irq.h> 17 #include <linux/irqdomain.h> 18 #include <linux/module.h> 19 #include <linux/of.h> 20 #include <linux/of_address.h> 21 #include <linux/of_irq.h> 22 #include <linux/platform_device.h> 23 #include <linux/spinlock.h> 24 #include <linux/platform_data/gpio-dwapb.h> 25 #include <linux/slab.h> 26 27 #define GPIO_SWPORTA_DR 0x00 28 #define GPIO_SWPORTA_DDR 0x04 29 #define GPIO_SWPORTB_DR 0x0c 30 #define GPIO_SWPORTB_DDR 0x10 31 #define GPIO_SWPORTC_DR 0x18 32 #define GPIO_SWPORTC_DDR 0x1c 33 #define GPIO_SWPORTD_DR 0x24 34 #define GPIO_SWPORTD_DDR 0x28 35 #define GPIO_INTEN 0x30 36 #define GPIO_INTMASK 0x34 37 #define GPIO_INTTYPE_LEVEL 0x38 38 #define GPIO_INT_POLARITY 0x3c 39 #define GPIO_INTSTATUS 0x40 40 #define GPIO_PORTA_DEBOUNCE 0x48 41 #define GPIO_PORTA_EOI 0x4c 42 #define GPIO_EXT_PORTA 0x50 43 #define GPIO_EXT_PORTB 0x54 44 #define GPIO_EXT_PORTC 0x58 45 #define GPIO_EXT_PORTD 0x5c 46 47 #define DWAPB_MAX_PORTS 4 48 #define GPIO_EXT_PORT_SIZE (GPIO_EXT_PORTB - GPIO_EXT_PORTA) 49 #define GPIO_SWPORT_DR_SIZE (GPIO_SWPORTB_DR - GPIO_SWPORTA_DR) 50 #define GPIO_SWPORT_DDR_SIZE (GPIO_SWPORTB_DDR - GPIO_SWPORTA_DDR) 51 52 struct dwapb_gpio; 53 54 #ifdef CONFIG_PM_SLEEP 55 /* Store GPIO context across system-wide suspend/resume transitions */ 56 struct dwapb_context { 57 u32 data; 58 u32 dir; 59 u32 ext; 60 u32 int_en; 61 u32 int_mask; 62 u32 int_type; 63 u32 int_pol; 64 u32 int_deb; 65 }; 66 #endif 67 68 struct dwapb_gpio_port { 69 struct bgpio_chip bgc; 70 bool is_registered; 71 struct dwapb_gpio *gpio; 72 #ifdef CONFIG_PM_SLEEP 73 struct dwapb_context *ctx; 74 #endif 75 unsigned int idx; 76 }; 77 78 struct dwapb_gpio { 79 struct device *dev; 80 void __iomem *regs; 81 struct dwapb_gpio_port *ports; 82 unsigned int nr_ports; 83 struct irq_domain *domain; 84 }; 85 86 static inline struct dwapb_gpio_port * 87 to_dwapb_gpio_port(struct bgpio_chip *bgc) 88 { 89 return container_of(bgc, struct dwapb_gpio_port, bgc); 90 } 91 92 static inline u32 dwapb_read(struct dwapb_gpio *gpio, unsigned int offset) 93 { 94 struct bgpio_chip *bgc = &gpio->ports[0].bgc; 95 void __iomem *reg_base = gpio->regs; 96 97 return bgc->read_reg(reg_base + offset); 98 } 99 100 static inline void dwapb_write(struct dwapb_gpio *gpio, unsigned int offset, 101 u32 val) 102 { 103 struct bgpio_chip *bgc = &gpio->ports[0].bgc; 104 void __iomem *reg_base = gpio->regs; 105 106 bgc->write_reg(reg_base + offset, val); 107 } 108 109 static int dwapb_gpio_to_irq(struct gpio_chip *gc, unsigned offset) 110 { 111 struct bgpio_chip *bgc = to_bgpio_chip(gc); 112 struct dwapb_gpio_port *port = to_dwapb_gpio_port(bgc); 113 struct dwapb_gpio *gpio = port->gpio; 114 115 return irq_find_mapping(gpio->domain, offset); 116 } 117 118 static void dwapb_toggle_trigger(struct dwapb_gpio *gpio, unsigned int offs) 119 { 120 u32 v = dwapb_read(gpio, GPIO_INT_POLARITY); 121 122 if (gpio_get_value(gpio->ports[0].bgc.gc.base + offs)) 123 v &= ~BIT(offs); 124 else 125 v |= BIT(offs); 126 127 dwapb_write(gpio, GPIO_INT_POLARITY, v); 128 } 129 130 static u32 dwapb_do_irq(struct dwapb_gpio *gpio) 131 { 132 u32 irq_status = readl_relaxed(gpio->regs + GPIO_INTSTATUS); 133 u32 ret = irq_status; 134 135 while (irq_status) { 136 int hwirq = fls(irq_status) - 1; 137 int gpio_irq = irq_find_mapping(gpio->domain, hwirq); 138 139 generic_handle_irq(gpio_irq); 140 irq_status &= ~BIT(hwirq); 141 142 if ((irq_get_trigger_type(gpio_irq) & IRQ_TYPE_SENSE_MASK) 143 == IRQ_TYPE_EDGE_BOTH) 144 dwapb_toggle_trigger(gpio, hwirq); 145 } 146 147 return ret; 148 } 149 150 static void dwapb_irq_handler(u32 irq, struct irq_desc *desc) 151 { 152 struct dwapb_gpio *gpio = irq_get_handler_data(irq); 153 struct irq_chip *chip = irq_desc_get_chip(desc); 154 155 dwapb_do_irq(gpio); 156 157 if (chip->irq_eoi) 158 chip->irq_eoi(irq_desc_get_irq_data(desc)); 159 } 160 161 static void dwapb_irq_enable(struct irq_data *d) 162 { 163 struct irq_chip_generic *igc = irq_data_get_irq_chip_data(d); 164 struct dwapb_gpio *gpio = igc->private; 165 struct bgpio_chip *bgc = &gpio->ports[0].bgc; 166 unsigned long flags; 167 u32 val; 168 169 spin_lock_irqsave(&bgc->lock, flags); 170 val = dwapb_read(gpio, GPIO_INTEN); 171 val |= BIT(d->hwirq); 172 dwapb_write(gpio, GPIO_INTEN, val); 173 spin_unlock_irqrestore(&bgc->lock, flags); 174 } 175 176 static void dwapb_irq_disable(struct irq_data *d) 177 { 178 struct irq_chip_generic *igc = irq_data_get_irq_chip_data(d); 179 struct dwapb_gpio *gpio = igc->private; 180 struct bgpio_chip *bgc = &gpio->ports[0].bgc; 181 unsigned long flags; 182 u32 val; 183 184 spin_lock_irqsave(&bgc->lock, flags); 185 val = dwapb_read(gpio, GPIO_INTEN); 186 val &= ~BIT(d->hwirq); 187 dwapb_write(gpio, GPIO_INTEN, val); 188 spin_unlock_irqrestore(&bgc->lock, flags); 189 } 190 191 static int dwapb_irq_reqres(struct irq_data *d) 192 { 193 struct irq_chip_generic *igc = irq_data_get_irq_chip_data(d); 194 struct dwapb_gpio *gpio = igc->private; 195 struct bgpio_chip *bgc = &gpio->ports[0].bgc; 196 197 if (gpiochip_lock_as_irq(&bgc->gc, irqd_to_hwirq(d))) { 198 dev_err(gpio->dev, "unable to lock HW IRQ %lu for IRQ\n", 199 irqd_to_hwirq(d)); 200 return -EINVAL; 201 } 202 return 0; 203 } 204 205 static void dwapb_irq_relres(struct irq_data *d) 206 { 207 struct irq_chip_generic *igc = irq_data_get_irq_chip_data(d); 208 struct dwapb_gpio *gpio = igc->private; 209 struct bgpio_chip *bgc = &gpio->ports[0].bgc; 210 211 gpiochip_unlock_as_irq(&bgc->gc, irqd_to_hwirq(d)); 212 } 213 214 static int dwapb_irq_set_type(struct irq_data *d, u32 type) 215 { 216 struct irq_chip_generic *igc = irq_data_get_irq_chip_data(d); 217 struct dwapb_gpio *gpio = igc->private; 218 struct bgpio_chip *bgc = &gpio->ports[0].bgc; 219 int bit = d->hwirq; 220 unsigned long level, polarity, flags; 221 222 if (type & ~(IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING | 223 IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW)) 224 return -EINVAL; 225 226 spin_lock_irqsave(&bgc->lock, flags); 227 level = dwapb_read(gpio, GPIO_INTTYPE_LEVEL); 228 polarity = dwapb_read(gpio, GPIO_INT_POLARITY); 229 230 switch (type) { 231 case IRQ_TYPE_EDGE_BOTH: 232 level |= BIT(bit); 233 dwapb_toggle_trigger(gpio, bit); 234 break; 235 case IRQ_TYPE_EDGE_RISING: 236 level |= BIT(bit); 237 polarity |= BIT(bit); 238 break; 239 case IRQ_TYPE_EDGE_FALLING: 240 level |= BIT(bit); 241 polarity &= ~BIT(bit); 242 break; 243 case IRQ_TYPE_LEVEL_HIGH: 244 level &= ~BIT(bit); 245 polarity |= BIT(bit); 246 break; 247 case IRQ_TYPE_LEVEL_LOW: 248 level &= ~BIT(bit); 249 polarity &= ~BIT(bit); 250 break; 251 } 252 253 irq_setup_alt_chip(d, type); 254 255 dwapb_write(gpio, GPIO_INTTYPE_LEVEL, level); 256 dwapb_write(gpio, GPIO_INT_POLARITY, polarity); 257 spin_unlock_irqrestore(&bgc->lock, flags); 258 259 return 0; 260 } 261 262 static int dwapb_gpio_set_debounce(struct gpio_chip *gc, 263 unsigned offset, unsigned debounce) 264 { 265 struct bgpio_chip *bgc = to_bgpio_chip(gc); 266 struct dwapb_gpio_port *port = to_dwapb_gpio_port(bgc); 267 struct dwapb_gpio *gpio = port->gpio; 268 unsigned long flags, val_deb; 269 unsigned long mask = bgc->pin2mask(bgc, offset); 270 271 spin_lock_irqsave(&bgc->lock, flags); 272 273 val_deb = dwapb_read(gpio, GPIO_PORTA_DEBOUNCE); 274 if (debounce) 275 dwapb_write(gpio, GPIO_PORTA_DEBOUNCE, val_deb | mask); 276 else 277 dwapb_write(gpio, GPIO_PORTA_DEBOUNCE, val_deb & ~mask); 278 279 spin_unlock_irqrestore(&bgc->lock, flags); 280 281 return 0; 282 } 283 284 static irqreturn_t dwapb_irq_handler_mfd(int irq, void *dev_id) 285 { 286 u32 worked; 287 struct dwapb_gpio *gpio = dev_id; 288 289 worked = dwapb_do_irq(gpio); 290 291 return worked ? IRQ_HANDLED : IRQ_NONE; 292 } 293 294 static void dwapb_configure_irqs(struct dwapb_gpio *gpio, 295 struct dwapb_gpio_port *port, 296 struct dwapb_port_property *pp) 297 { 298 struct gpio_chip *gc = &port->bgc.gc; 299 struct device_node *node = pp->node; 300 struct irq_chip_generic *irq_gc = NULL; 301 unsigned int hwirq, ngpio = gc->ngpio; 302 struct irq_chip_type *ct; 303 int err, i; 304 305 gpio->domain = irq_domain_add_linear(node, ngpio, 306 &irq_generic_chip_ops, gpio); 307 if (!gpio->domain) 308 return; 309 310 err = irq_alloc_domain_generic_chips(gpio->domain, ngpio, 2, 311 "gpio-dwapb", handle_level_irq, 312 IRQ_NOREQUEST, 0, 313 IRQ_GC_INIT_NESTED_LOCK); 314 if (err) { 315 dev_info(gpio->dev, "irq_alloc_domain_generic_chips failed\n"); 316 irq_domain_remove(gpio->domain); 317 gpio->domain = NULL; 318 return; 319 } 320 321 irq_gc = irq_get_domain_generic_chip(gpio->domain, 0); 322 if (!irq_gc) { 323 irq_domain_remove(gpio->domain); 324 gpio->domain = NULL; 325 return; 326 } 327 328 irq_gc->reg_base = gpio->regs; 329 irq_gc->private = gpio; 330 331 for (i = 0; i < 2; i++) { 332 ct = &irq_gc->chip_types[i]; 333 ct->chip.irq_ack = irq_gc_ack_set_bit; 334 ct->chip.irq_mask = irq_gc_mask_set_bit; 335 ct->chip.irq_unmask = irq_gc_mask_clr_bit; 336 ct->chip.irq_set_type = dwapb_irq_set_type; 337 ct->chip.irq_enable = dwapb_irq_enable; 338 ct->chip.irq_disable = dwapb_irq_disable; 339 ct->chip.irq_request_resources = dwapb_irq_reqres; 340 ct->chip.irq_release_resources = dwapb_irq_relres; 341 ct->regs.ack = GPIO_PORTA_EOI; 342 ct->regs.mask = GPIO_INTMASK; 343 ct->type = IRQ_TYPE_LEVEL_MASK; 344 } 345 346 irq_gc->chip_types[0].type = IRQ_TYPE_LEVEL_MASK; 347 irq_gc->chip_types[1].type = IRQ_TYPE_EDGE_BOTH; 348 irq_gc->chip_types[1].handler = handle_edge_irq; 349 350 if (!pp->irq_shared) { 351 irq_set_chained_handler(pp->irq, dwapb_irq_handler); 352 irq_set_handler_data(pp->irq, gpio); 353 } else { 354 /* 355 * Request a shared IRQ since where MFD would have devices 356 * using the same irq pin 357 */ 358 err = devm_request_irq(gpio->dev, pp->irq, 359 dwapb_irq_handler_mfd, 360 IRQF_SHARED, "gpio-dwapb-mfd", gpio); 361 if (err) { 362 dev_err(gpio->dev, "error requesting IRQ\n"); 363 irq_domain_remove(gpio->domain); 364 gpio->domain = NULL; 365 return; 366 } 367 } 368 369 for (hwirq = 0 ; hwirq < ngpio ; hwirq++) 370 irq_create_mapping(gpio->domain, hwirq); 371 372 port->bgc.gc.to_irq = dwapb_gpio_to_irq; 373 } 374 375 static void dwapb_irq_teardown(struct dwapb_gpio *gpio) 376 { 377 struct dwapb_gpio_port *port = &gpio->ports[0]; 378 struct gpio_chip *gc = &port->bgc.gc; 379 unsigned int ngpio = gc->ngpio; 380 irq_hw_number_t hwirq; 381 382 if (!gpio->domain) 383 return; 384 385 for (hwirq = 0 ; hwirq < ngpio ; hwirq++) 386 irq_dispose_mapping(irq_find_mapping(gpio->domain, hwirq)); 387 388 irq_domain_remove(gpio->domain); 389 gpio->domain = NULL; 390 } 391 392 static int dwapb_gpio_add_port(struct dwapb_gpio *gpio, 393 struct dwapb_port_property *pp, 394 unsigned int offs) 395 { 396 struct dwapb_gpio_port *port; 397 void __iomem *dat, *set, *dirout; 398 int err; 399 400 port = &gpio->ports[offs]; 401 port->gpio = gpio; 402 port->idx = pp->idx; 403 404 #ifdef CONFIG_PM_SLEEP 405 port->ctx = devm_kzalloc(gpio->dev, sizeof(*port->ctx), GFP_KERNEL); 406 if (!port->ctx) 407 return -ENOMEM; 408 #endif 409 410 dat = gpio->regs + GPIO_EXT_PORTA + (pp->idx * GPIO_EXT_PORT_SIZE); 411 set = gpio->regs + GPIO_SWPORTA_DR + (pp->idx * GPIO_SWPORT_DR_SIZE); 412 dirout = gpio->regs + GPIO_SWPORTA_DDR + 413 (pp->idx * GPIO_SWPORT_DDR_SIZE); 414 415 err = bgpio_init(&port->bgc, gpio->dev, 4, dat, set, NULL, dirout, 416 NULL, false); 417 if (err) { 418 dev_err(gpio->dev, "failed to init gpio chip for %s\n", 419 pp->name); 420 return err; 421 } 422 423 #ifdef CONFIG_OF_GPIO 424 port->bgc.gc.of_node = pp->node; 425 #endif 426 port->bgc.gc.ngpio = pp->ngpio; 427 port->bgc.gc.base = pp->gpio_base; 428 429 /* Only port A support debounce */ 430 if (pp->idx == 0) 431 port->bgc.gc.set_debounce = dwapb_gpio_set_debounce; 432 433 if (pp->irq) 434 dwapb_configure_irqs(gpio, port, pp); 435 436 err = gpiochip_add(&port->bgc.gc); 437 if (err) 438 dev_err(gpio->dev, "failed to register gpiochip for %s\n", 439 pp->name); 440 else 441 port->is_registered = true; 442 443 return err; 444 } 445 446 static void dwapb_gpio_unregister(struct dwapb_gpio *gpio) 447 { 448 unsigned int m; 449 450 for (m = 0; m < gpio->nr_ports; ++m) 451 if (gpio->ports[m].is_registered) 452 gpiochip_remove(&gpio->ports[m].bgc.gc); 453 } 454 455 static struct dwapb_platform_data * 456 dwapb_gpio_get_pdata_of(struct device *dev) 457 { 458 struct device_node *node, *port_np; 459 struct dwapb_platform_data *pdata; 460 struct dwapb_port_property *pp; 461 int nports; 462 int i; 463 464 node = dev->of_node; 465 if (!IS_ENABLED(CONFIG_OF_GPIO) || !node) 466 return ERR_PTR(-ENODEV); 467 468 nports = of_get_child_count(node); 469 if (nports == 0) 470 return ERR_PTR(-ENODEV); 471 472 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); 473 if (!pdata) 474 return ERR_PTR(-ENOMEM); 475 476 pdata->properties = devm_kcalloc(dev, nports, sizeof(*pp), GFP_KERNEL); 477 if (!pdata->properties) 478 return ERR_PTR(-ENOMEM); 479 480 pdata->nports = nports; 481 482 i = 0; 483 for_each_child_of_node(node, port_np) { 484 pp = &pdata->properties[i++]; 485 pp->node = port_np; 486 487 if (of_property_read_u32(port_np, "reg", &pp->idx) || 488 pp->idx >= DWAPB_MAX_PORTS) { 489 dev_err(dev, "missing/invalid port index for %s\n", 490 port_np->full_name); 491 return ERR_PTR(-EINVAL); 492 } 493 494 if (of_property_read_u32(port_np, "snps,nr-gpios", 495 &pp->ngpio)) { 496 dev_info(dev, "failed to get number of gpios for %s\n", 497 port_np->full_name); 498 pp->ngpio = 32; 499 } 500 501 /* 502 * Only port A can provide interrupts in all configurations of 503 * the IP. 504 */ 505 if (pp->idx == 0 && 506 of_property_read_bool(port_np, "interrupt-controller")) { 507 pp->irq = irq_of_parse_and_map(port_np, 0); 508 if (!pp->irq) { 509 dev_warn(dev, "no irq for bank %s\n", 510 port_np->full_name); 511 } 512 } 513 514 pp->irq_shared = false; 515 pp->gpio_base = -1; 516 pp->name = port_np->full_name; 517 } 518 519 return pdata; 520 } 521 522 static int dwapb_gpio_probe(struct platform_device *pdev) 523 { 524 unsigned int i; 525 struct resource *res; 526 struct dwapb_gpio *gpio; 527 int err; 528 struct device *dev = &pdev->dev; 529 struct dwapb_platform_data *pdata = dev_get_platdata(dev); 530 531 if (!pdata) { 532 pdata = dwapb_gpio_get_pdata_of(dev); 533 if (IS_ERR(pdata)) 534 return PTR_ERR(pdata); 535 } 536 537 if (!pdata->nports) 538 return -ENODEV; 539 540 gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL); 541 if (!gpio) 542 return -ENOMEM; 543 544 gpio->dev = &pdev->dev; 545 gpio->nr_ports = pdata->nports; 546 547 gpio->ports = devm_kcalloc(&pdev->dev, gpio->nr_ports, 548 sizeof(*gpio->ports), GFP_KERNEL); 549 if (!gpio->ports) 550 return -ENOMEM; 551 552 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 553 gpio->regs = devm_ioremap_resource(&pdev->dev, res); 554 if (IS_ERR(gpio->regs)) 555 return PTR_ERR(gpio->regs); 556 557 for (i = 0; i < gpio->nr_ports; i++) { 558 err = dwapb_gpio_add_port(gpio, &pdata->properties[i], i); 559 if (err) 560 goto out_unregister; 561 } 562 platform_set_drvdata(pdev, gpio); 563 564 return 0; 565 566 out_unregister: 567 dwapb_gpio_unregister(gpio); 568 dwapb_irq_teardown(gpio); 569 570 return err; 571 } 572 573 static int dwapb_gpio_remove(struct platform_device *pdev) 574 { 575 struct dwapb_gpio *gpio = platform_get_drvdata(pdev); 576 577 dwapb_gpio_unregister(gpio); 578 dwapb_irq_teardown(gpio); 579 580 return 0; 581 } 582 583 static const struct of_device_id dwapb_of_match[] = { 584 { .compatible = "snps,dw-apb-gpio" }, 585 { /* Sentinel */ } 586 }; 587 MODULE_DEVICE_TABLE(of, dwapb_of_match); 588 589 #ifdef CONFIG_PM_SLEEP 590 static int dwapb_gpio_suspend(struct device *dev) 591 { 592 struct platform_device *pdev = to_platform_device(dev); 593 struct dwapb_gpio *gpio = platform_get_drvdata(pdev); 594 struct bgpio_chip *bgc = &gpio->ports[0].bgc; 595 unsigned long flags; 596 int i; 597 598 spin_lock_irqsave(&bgc->lock, flags); 599 for (i = 0; i < gpio->nr_ports; i++) { 600 unsigned int offset; 601 unsigned int idx = gpio->ports[i].idx; 602 struct dwapb_context *ctx = gpio->ports[i].ctx; 603 604 BUG_ON(!ctx); 605 606 offset = GPIO_SWPORTA_DDR + idx * GPIO_SWPORT_DDR_SIZE; 607 ctx->dir = dwapb_read(gpio, offset); 608 609 offset = GPIO_SWPORTA_DR + idx * GPIO_SWPORT_DR_SIZE; 610 ctx->data = dwapb_read(gpio, offset); 611 612 offset = GPIO_EXT_PORTA + idx * GPIO_EXT_PORT_SIZE; 613 ctx->ext = dwapb_read(gpio, offset); 614 615 /* Only port A can provide interrupts */ 616 if (idx == 0) { 617 ctx->int_mask = dwapb_read(gpio, GPIO_INTMASK); 618 ctx->int_en = dwapb_read(gpio, GPIO_INTEN); 619 ctx->int_pol = dwapb_read(gpio, GPIO_INT_POLARITY); 620 ctx->int_type = dwapb_read(gpio, GPIO_INTTYPE_LEVEL); 621 ctx->int_deb = dwapb_read(gpio, GPIO_PORTA_DEBOUNCE); 622 623 /* Mask out interrupts */ 624 dwapb_write(gpio, GPIO_INTMASK, 0xffffffff); 625 } 626 } 627 spin_unlock_irqrestore(&bgc->lock, flags); 628 629 return 0; 630 } 631 632 static int dwapb_gpio_resume(struct device *dev) 633 { 634 struct platform_device *pdev = to_platform_device(dev); 635 struct dwapb_gpio *gpio = platform_get_drvdata(pdev); 636 struct bgpio_chip *bgc = &gpio->ports[0].bgc; 637 unsigned long flags; 638 int i; 639 640 spin_lock_irqsave(&bgc->lock, flags); 641 for (i = 0; i < gpio->nr_ports; i++) { 642 unsigned int offset; 643 unsigned int idx = gpio->ports[i].idx; 644 struct dwapb_context *ctx = gpio->ports[i].ctx; 645 646 BUG_ON(!ctx); 647 648 offset = GPIO_SWPORTA_DR + idx * GPIO_SWPORT_DR_SIZE; 649 dwapb_write(gpio, offset, ctx->data); 650 651 offset = GPIO_SWPORTA_DDR + idx * GPIO_SWPORT_DDR_SIZE; 652 dwapb_write(gpio, offset, ctx->dir); 653 654 offset = GPIO_EXT_PORTA + idx * GPIO_EXT_PORT_SIZE; 655 dwapb_write(gpio, offset, ctx->ext); 656 657 /* Only port A can provide interrupts */ 658 if (idx == 0) { 659 dwapb_write(gpio, GPIO_INTTYPE_LEVEL, ctx->int_type); 660 dwapb_write(gpio, GPIO_INT_POLARITY, ctx->int_pol); 661 dwapb_write(gpio, GPIO_PORTA_DEBOUNCE, ctx->int_deb); 662 dwapb_write(gpio, GPIO_INTEN, ctx->int_en); 663 dwapb_write(gpio, GPIO_INTMASK, ctx->int_mask); 664 665 /* Clear out spurious interrupts */ 666 dwapb_write(gpio, GPIO_PORTA_EOI, 0xffffffff); 667 } 668 } 669 spin_unlock_irqrestore(&bgc->lock, flags); 670 671 return 0; 672 } 673 #endif 674 675 static SIMPLE_DEV_PM_OPS(dwapb_gpio_pm_ops, dwapb_gpio_suspend, 676 dwapb_gpio_resume); 677 678 static struct platform_driver dwapb_gpio_driver = { 679 .driver = { 680 .name = "gpio-dwapb", 681 .pm = &dwapb_gpio_pm_ops, 682 .of_match_table = of_match_ptr(dwapb_of_match), 683 }, 684 .probe = dwapb_gpio_probe, 685 .remove = dwapb_gpio_remove, 686 }; 687 688 module_platform_driver(dwapb_gpio_driver); 689 690 MODULE_LICENSE("GPL"); 691 MODULE_AUTHOR("Jamie Iles"); 692 MODULE_DESCRIPTION("Synopsys DesignWare APB GPIO driver"); 693