1 /* 2 * SPEAr platform PLGPIO driver 3 * 4 * Copyright (C) 2012 ST Microelectronics 5 * Viresh Kumar <viresh.kumar@linaro.org> 6 * 7 * This file is licensed under the terms of the GNU General Public 8 * License version 2. This program is licensed "as is" without any 9 * warranty of any kind, whether express or implied. 10 */ 11 12 #include <linux/clk.h> 13 #include <linux/err.h> 14 #include <linux/gpio/driver.h> 15 #include <linux/io.h> 16 #include <linux/module.h> 17 #include <linux/of.h> 18 #include <linux/of_platform.h> 19 #include <linux/pinctrl/consumer.h> 20 #include <linux/platform_device.h> 21 #include <linux/pm.h> 22 #include <linux/spinlock.h> 23 24 #define MAX_GPIO_PER_REG 32 25 #define PIN_OFFSET(pin) (pin % MAX_GPIO_PER_REG) 26 #define REG_OFFSET(base, reg, pin) (base + reg + (pin / MAX_GPIO_PER_REG) \ 27 * sizeof(int *)) 28 29 /* 30 * plgpio pins in all machines are not one to one mapped, bitwise with registers 31 * bits. These set of macros define register masks for which below functions 32 * (pin_to_offset and offset_to_pin) are required to be called. 33 */ 34 #define PTO_ENB_REG 0x001 35 #define PTO_WDATA_REG 0x002 36 #define PTO_DIR_REG 0x004 37 #define PTO_IE_REG 0x008 38 #define PTO_RDATA_REG 0x010 39 #define PTO_MIS_REG 0x020 40 41 struct plgpio_regs { 42 u32 enb; /* enable register */ 43 u32 wdata; /* write data register */ 44 u32 dir; /* direction set register */ 45 u32 rdata; /* read data register */ 46 u32 ie; /* interrupt enable register */ 47 u32 mis; /* mask interrupt status register */ 48 u32 eit; /* edge interrupt type */ 49 }; 50 51 /* 52 * struct plgpio: plgpio driver specific structure 53 * 54 * lock: lock for guarding gpio registers 55 * base: base address of plgpio block 56 * chip: gpio framework specific chip information structure 57 * p2o: function ptr for pin to offset conversion. This is required only for 58 * machines where mapping b/w pin and offset is not 1-to-1. 59 * o2p: function ptr for offset to pin conversion. This is required only for 60 * machines where mapping b/w pin and offset is not 1-to-1. 61 * p2o_regs: mask of registers for which p2o and o2p are applicable 62 * regs: register offsets 63 * csave_regs: context save registers for standby/sleep/hibernate cases 64 */ 65 struct plgpio { 66 spinlock_t lock; 67 void __iomem *base; 68 struct clk *clk; 69 struct gpio_chip chip; 70 int (*p2o)(int pin); /* pin_to_offset */ 71 int (*o2p)(int offset); /* offset_to_pin */ 72 u32 p2o_regs; 73 struct plgpio_regs regs; 74 #ifdef CONFIG_PM_SLEEP 75 struct plgpio_regs *csave_regs; 76 #endif 77 }; 78 79 /* register manipulation inline functions */ 80 static inline u32 is_plgpio_set(void __iomem *base, u32 pin, u32 reg) 81 { 82 u32 offset = PIN_OFFSET(pin); 83 void __iomem *reg_off = REG_OFFSET(base, reg, pin); 84 u32 val = readl_relaxed(reg_off); 85 86 return !!(val & (1 << offset)); 87 } 88 89 static inline void plgpio_reg_set(void __iomem *base, u32 pin, u32 reg) 90 { 91 u32 offset = PIN_OFFSET(pin); 92 void __iomem *reg_off = REG_OFFSET(base, reg, pin); 93 u32 val = readl_relaxed(reg_off); 94 95 writel_relaxed(val | (1 << offset), reg_off); 96 } 97 98 static inline void plgpio_reg_reset(void __iomem *base, u32 pin, u32 reg) 99 { 100 u32 offset = PIN_OFFSET(pin); 101 void __iomem *reg_off = REG_OFFSET(base, reg, pin); 102 u32 val = readl_relaxed(reg_off); 103 104 writel_relaxed(val & ~(1 << offset), reg_off); 105 } 106 107 /* gpio framework specific routines */ 108 static int plgpio_direction_input(struct gpio_chip *chip, unsigned offset) 109 { 110 struct plgpio *plgpio = container_of(chip, struct plgpio, chip); 111 unsigned long flags; 112 113 /* get correct offset for "offset" pin */ 114 if (plgpio->p2o && (plgpio->p2o_regs & PTO_DIR_REG)) { 115 offset = plgpio->p2o(offset); 116 if (offset == -1) 117 return -EINVAL; 118 } 119 120 spin_lock_irqsave(&plgpio->lock, flags); 121 plgpio_reg_set(plgpio->base, offset, plgpio->regs.dir); 122 spin_unlock_irqrestore(&plgpio->lock, flags); 123 124 return 0; 125 } 126 127 static int plgpio_direction_output(struct gpio_chip *chip, unsigned offset, 128 int value) 129 { 130 struct plgpio *plgpio = container_of(chip, struct plgpio, chip); 131 unsigned long flags; 132 unsigned dir_offset = offset, wdata_offset = offset, tmp; 133 134 /* get correct offset for "offset" pin */ 135 if (plgpio->p2o && (plgpio->p2o_regs & (PTO_DIR_REG | PTO_WDATA_REG))) { 136 tmp = plgpio->p2o(offset); 137 if (tmp == -1) 138 return -EINVAL; 139 140 if (plgpio->p2o_regs & PTO_DIR_REG) 141 dir_offset = tmp; 142 if (plgpio->p2o_regs & PTO_WDATA_REG) 143 wdata_offset = tmp; 144 } 145 146 spin_lock_irqsave(&plgpio->lock, flags); 147 if (value) 148 plgpio_reg_set(plgpio->base, wdata_offset, 149 plgpio->regs.wdata); 150 else 151 plgpio_reg_reset(plgpio->base, wdata_offset, 152 plgpio->regs.wdata); 153 154 plgpio_reg_reset(plgpio->base, dir_offset, plgpio->regs.dir); 155 spin_unlock_irqrestore(&plgpio->lock, flags); 156 157 return 0; 158 } 159 160 static int plgpio_get_value(struct gpio_chip *chip, unsigned offset) 161 { 162 struct plgpio *plgpio = container_of(chip, struct plgpio, chip); 163 164 if (offset >= chip->ngpio) 165 return -EINVAL; 166 167 /* get correct offset for "offset" pin */ 168 if (plgpio->p2o && (plgpio->p2o_regs & PTO_RDATA_REG)) { 169 offset = plgpio->p2o(offset); 170 if (offset == -1) 171 return -EINVAL; 172 } 173 174 return is_plgpio_set(plgpio->base, offset, plgpio->regs.rdata); 175 } 176 177 static void plgpio_set_value(struct gpio_chip *chip, unsigned offset, int value) 178 { 179 struct plgpio *plgpio = container_of(chip, struct plgpio, chip); 180 181 if (offset >= chip->ngpio) 182 return; 183 184 /* get correct offset for "offset" pin */ 185 if (plgpio->p2o && (plgpio->p2o_regs & PTO_WDATA_REG)) { 186 offset = plgpio->p2o(offset); 187 if (offset == -1) 188 return; 189 } 190 191 if (value) 192 plgpio_reg_set(plgpio->base, offset, plgpio->regs.wdata); 193 else 194 plgpio_reg_reset(plgpio->base, offset, plgpio->regs.wdata); 195 } 196 197 static int plgpio_request(struct gpio_chip *chip, unsigned offset) 198 { 199 struct plgpio *plgpio = container_of(chip, struct plgpio, chip); 200 int gpio = chip->base + offset; 201 unsigned long flags; 202 int ret = 0; 203 204 if (offset >= chip->ngpio) 205 return -EINVAL; 206 207 ret = pinctrl_request_gpio(gpio); 208 if (ret) 209 return ret; 210 211 if (!IS_ERR(plgpio->clk)) { 212 ret = clk_enable(plgpio->clk); 213 if (ret) 214 goto err0; 215 } 216 217 if (plgpio->regs.enb == -1) 218 return 0; 219 220 /* 221 * put gpio in IN mode before enabling it. This make enabling gpio safe 222 */ 223 ret = plgpio_direction_input(chip, offset); 224 if (ret) 225 goto err1; 226 227 /* get correct offset for "offset" pin */ 228 if (plgpio->p2o && (plgpio->p2o_regs & PTO_ENB_REG)) { 229 offset = plgpio->p2o(offset); 230 if (offset == -1) { 231 ret = -EINVAL; 232 goto err1; 233 } 234 } 235 236 spin_lock_irqsave(&plgpio->lock, flags); 237 plgpio_reg_set(plgpio->base, offset, plgpio->regs.enb); 238 spin_unlock_irqrestore(&plgpio->lock, flags); 239 return 0; 240 241 err1: 242 if (!IS_ERR(plgpio->clk)) 243 clk_disable(plgpio->clk); 244 err0: 245 pinctrl_free_gpio(gpio); 246 return ret; 247 } 248 249 static void plgpio_free(struct gpio_chip *chip, unsigned offset) 250 { 251 struct plgpio *plgpio = container_of(chip, struct plgpio, chip); 252 int gpio = chip->base + offset; 253 unsigned long flags; 254 255 if (offset >= chip->ngpio) 256 return; 257 258 if (plgpio->regs.enb == -1) 259 goto disable_clk; 260 261 /* get correct offset for "offset" pin */ 262 if (plgpio->p2o && (plgpio->p2o_regs & PTO_ENB_REG)) { 263 offset = plgpio->p2o(offset); 264 if (offset == -1) 265 return; 266 } 267 268 spin_lock_irqsave(&plgpio->lock, flags); 269 plgpio_reg_reset(plgpio->base, offset, plgpio->regs.enb); 270 spin_unlock_irqrestore(&plgpio->lock, flags); 271 272 disable_clk: 273 if (!IS_ERR(plgpio->clk)) 274 clk_disable(plgpio->clk); 275 276 pinctrl_free_gpio(gpio); 277 } 278 279 /* PLGPIO IRQ */ 280 static void plgpio_irq_disable(struct irq_data *d) 281 { 282 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 283 struct plgpio *plgpio = container_of(gc, struct plgpio, chip); 284 int offset = d->hwirq; 285 unsigned long flags; 286 287 /* get correct offset for "offset" pin */ 288 if (plgpio->p2o && (plgpio->p2o_regs & PTO_IE_REG)) { 289 offset = plgpio->p2o(offset); 290 if (offset == -1) 291 return; 292 } 293 294 spin_lock_irqsave(&plgpio->lock, flags); 295 plgpio_reg_set(plgpio->base, offset, plgpio->regs.ie); 296 spin_unlock_irqrestore(&plgpio->lock, flags); 297 } 298 299 static void plgpio_irq_enable(struct irq_data *d) 300 { 301 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 302 struct plgpio *plgpio = container_of(gc, struct plgpio, chip); 303 int offset = d->hwirq; 304 unsigned long flags; 305 306 /* get correct offset for "offset" pin */ 307 if (plgpio->p2o && (plgpio->p2o_regs & PTO_IE_REG)) { 308 offset = plgpio->p2o(offset); 309 if (offset == -1) 310 return; 311 } 312 313 spin_lock_irqsave(&plgpio->lock, flags); 314 plgpio_reg_reset(plgpio->base, offset, plgpio->regs.ie); 315 spin_unlock_irqrestore(&plgpio->lock, flags); 316 } 317 318 static int plgpio_irq_set_type(struct irq_data *d, unsigned trigger) 319 { 320 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 321 struct plgpio *plgpio = container_of(gc, struct plgpio, chip); 322 int offset = d->hwirq; 323 void __iomem *reg_off; 324 unsigned int supported_type = 0, val; 325 326 if (offset >= plgpio->chip.ngpio) 327 return -EINVAL; 328 329 if (plgpio->regs.eit == -1) 330 supported_type = IRQ_TYPE_LEVEL_HIGH; 331 else 332 supported_type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING; 333 334 if (!(trigger & supported_type)) 335 return -EINVAL; 336 337 if (plgpio->regs.eit == -1) 338 return 0; 339 340 reg_off = REG_OFFSET(plgpio->base, plgpio->regs.eit, offset); 341 val = readl_relaxed(reg_off); 342 343 offset = PIN_OFFSET(offset); 344 if (trigger & IRQ_TYPE_EDGE_RISING) 345 writel_relaxed(val | (1 << offset), reg_off); 346 else 347 writel_relaxed(val & ~(1 << offset), reg_off); 348 349 return 0; 350 } 351 352 static struct irq_chip plgpio_irqchip = { 353 .name = "PLGPIO", 354 .irq_enable = plgpio_irq_enable, 355 .irq_disable = plgpio_irq_disable, 356 .irq_set_type = plgpio_irq_set_type, 357 }; 358 359 static void plgpio_irq_handler(unsigned irq, struct irq_desc *desc) 360 { 361 struct gpio_chip *gc = irq_desc_get_handler_data(desc); 362 struct plgpio *plgpio = container_of(gc, struct plgpio, chip); 363 struct irq_chip *irqchip = irq_desc_get_chip(desc); 364 int regs_count, count, pin, offset, i = 0; 365 unsigned long pending; 366 367 count = plgpio->chip.ngpio; 368 regs_count = DIV_ROUND_UP(count, MAX_GPIO_PER_REG); 369 370 chained_irq_enter(irqchip, desc); 371 /* check all plgpio MIS registers for a possible interrupt */ 372 for (; i < regs_count; i++) { 373 pending = readl_relaxed(plgpio->base + plgpio->regs.mis + 374 i * sizeof(int *)); 375 if (!pending) 376 continue; 377 378 /* clear interrupts */ 379 writel_relaxed(~pending, plgpio->base + plgpio->regs.mis + 380 i * sizeof(int *)); 381 /* 382 * clear extra bits in last register having gpios < MAX/REG 383 * ex: Suppose there are max 102 plgpios. then last register 384 * must have only (102 - MAX_GPIO_PER_REG * 3) = 6 relevant bits 385 * so, we must not take other 28 bits into consideration for 386 * checking interrupt. so clear those bits. 387 */ 388 count = count - i * MAX_GPIO_PER_REG; 389 if (count < MAX_GPIO_PER_REG) 390 pending &= (1 << count) - 1; 391 392 for_each_set_bit(offset, &pending, MAX_GPIO_PER_REG) { 393 /* get correct pin for "offset" */ 394 if (plgpio->o2p && (plgpio->p2o_regs & PTO_MIS_REG)) { 395 pin = plgpio->o2p(offset); 396 if (pin == -1) 397 continue; 398 } else 399 pin = offset; 400 401 /* get correct irq line number */ 402 pin = i * MAX_GPIO_PER_REG + pin; 403 generic_handle_irq( 404 irq_find_mapping(gc->irqdomain, pin)); 405 } 406 } 407 chained_irq_exit(irqchip, desc); 408 } 409 410 /* 411 * pin to offset and offset to pin converter functions 412 * 413 * In spear310 there is inconsistency among bit positions in plgpio regiseters, 414 * for different plgpio pins. For example: for pin 27, bit offset is 23, pin 415 * 28-33 are not supported, pin 95 has offset bit 95, bit 100 has offset bit 1 416 */ 417 static int spear310_p2o(int pin) 418 { 419 int offset = pin; 420 421 if (pin <= 27) 422 offset += 4; 423 else if (pin <= 33) 424 offset = -1; 425 else if (pin <= 97) 426 offset -= 2; 427 else if (pin <= 101) 428 offset = 101 - pin; 429 else 430 offset = -1; 431 432 return offset; 433 } 434 435 static int spear310_o2p(int offset) 436 { 437 if (offset <= 3) 438 return 101 - offset; 439 else if (offset <= 31) 440 return offset - 4; 441 else 442 return offset + 2; 443 } 444 445 static int plgpio_probe_dt(struct platform_device *pdev, struct plgpio *plgpio) 446 { 447 struct device_node *np = pdev->dev.of_node; 448 int ret = -EINVAL; 449 u32 val; 450 451 if (of_machine_is_compatible("st,spear310")) { 452 plgpio->p2o = spear310_p2o; 453 plgpio->o2p = spear310_o2p; 454 plgpio->p2o_regs = PTO_WDATA_REG | PTO_DIR_REG | PTO_IE_REG | 455 PTO_RDATA_REG | PTO_MIS_REG; 456 } 457 458 if (!of_property_read_u32(np, "st-plgpio,ngpio", &val)) { 459 plgpio->chip.ngpio = val; 460 } else { 461 dev_err(&pdev->dev, "DT: Invalid ngpio field\n"); 462 goto end; 463 } 464 465 if (!of_property_read_u32(np, "st-plgpio,enb-reg", &val)) 466 plgpio->regs.enb = val; 467 else 468 plgpio->regs.enb = -1; 469 470 if (!of_property_read_u32(np, "st-plgpio,wdata-reg", &val)) { 471 plgpio->regs.wdata = val; 472 } else { 473 dev_err(&pdev->dev, "DT: Invalid wdata reg\n"); 474 goto end; 475 } 476 477 if (!of_property_read_u32(np, "st-plgpio,dir-reg", &val)) { 478 plgpio->regs.dir = val; 479 } else { 480 dev_err(&pdev->dev, "DT: Invalid dir reg\n"); 481 goto end; 482 } 483 484 if (!of_property_read_u32(np, "st-plgpio,ie-reg", &val)) { 485 plgpio->regs.ie = val; 486 } else { 487 dev_err(&pdev->dev, "DT: Invalid ie reg\n"); 488 goto end; 489 } 490 491 if (!of_property_read_u32(np, "st-plgpio,rdata-reg", &val)) { 492 plgpio->regs.rdata = val; 493 } else { 494 dev_err(&pdev->dev, "DT: Invalid rdata reg\n"); 495 goto end; 496 } 497 498 if (!of_property_read_u32(np, "st-plgpio,mis-reg", &val)) { 499 plgpio->regs.mis = val; 500 } else { 501 dev_err(&pdev->dev, "DT: Invalid mis reg\n"); 502 goto end; 503 } 504 505 if (!of_property_read_u32(np, "st-plgpio,eit-reg", &val)) 506 plgpio->regs.eit = val; 507 else 508 plgpio->regs.eit = -1; 509 510 return 0; 511 512 end: 513 return ret; 514 } 515 static int plgpio_probe(struct platform_device *pdev) 516 { 517 struct plgpio *plgpio; 518 struct resource *res; 519 int ret, irq; 520 521 plgpio = devm_kzalloc(&pdev->dev, sizeof(*plgpio), GFP_KERNEL); 522 if (!plgpio) { 523 dev_err(&pdev->dev, "memory allocation fail\n"); 524 return -ENOMEM; 525 } 526 527 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 528 plgpio->base = devm_ioremap_resource(&pdev->dev, res); 529 if (IS_ERR(plgpio->base)) 530 return PTR_ERR(plgpio->base); 531 532 ret = plgpio_probe_dt(pdev, plgpio); 533 if (ret) { 534 dev_err(&pdev->dev, "DT probe failed\n"); 535 return ret; 536 } 537 538 plgpio->clk = devm_clk_get(&pdev->dev, NULL); 539 if (IS_ERR(plgpio->clk)) 540 dev_warn(&pdev->dev, "clk_get() failed, work without it\n"); 541 542 #ifdef CONFIG_PM_SLEEP 543 plgpio->csave_regs = devm_kzalloc(&pdev->dev, 544 sizeof(*plgpio->csave_regs) * 545 DIV_ROUND_UP(plgpio->chip.ngpio, MAX_GPIO_PER_REG), 546 GFP_KERNEL); 547 if (!plgpio->csave_regs) { 548 dev_err(&pdev->dev, "csave registers memory allocation fail\n"); 549 return -ENOMEM; 550 } 551 #endif 552 553 platform_set_drvdata(pdev, plgpio); 554 spin_lock_init(&plgpio->lock); 555 556 plgpio->chip.base = -1; 557 plgpio->chip.request = plgpio_request; 558 plgpio->chip.free = plgpio_free; 559 plgpio->chip.direction_input = plgpio_direction_input; 560 plgpio->chip.direction_output = plgpio_direction_output; 561 plgpio->chip.get = plgpio_get_value; 562 plgpio->chip.set = plgpio_set_value; 563 plgpio->chip.label = dev_name(&pdev->dev); 564 plgpio->chip.dev = &pdev->dev; 565 plgpio->chip.owner = THIS_MODULE; 566 plgpio->chip.of_node = pdev->dev.of_node; 567 568 if (!IS_ERR(plgpio->clk)) { 569 ret = clk_prepare(plgpio->clk); 570 if (ret) { 571 dev_err(&pdev->dev, "clk prepare failed\n"); 572 return ret; 573 } 574 } 575 576 ret = gpiochip_add(&plgpio->chip); 577 if (ret) { 578 dev_err(&pdev->dev, "unable to add gpio chip\n"); 579 goto unprepare_clk; 580 } 581 582 irq = platform_get_irq(pdev, 0); 583 if (irq < 0) { 584 dev_info(&pdev->dev, "PLGPIO registered without IRQs\n"); 585 return 0; 586 } 587 588 ret = gpiochip_irqchip_add(&plgpio->chip, 589 &plgpio_irqchip, 590 0, 591 handle_simple_irq, 592 IRQ_TYPE_NONE); 593 if (ret) { 594 dev_err(&pdev->dev, "failed to add irqchip to gpiochip\n"); 595 goto remove_gpiochip; 596 } 597 598 gpiochip_set_chained_irqchip(&plgpio->chip, 599 &plgpio_irqchip, 600 irq, 601 plgpio_irq_handler); 602 603 dev_info(&pdev->dev, "PLGPIO registered with IRQs\n"); 604 605 return 0; 606 607 remove_gpiochip: 608 dev_info(&pdev->dev, "Remove gpiochip\n"); 609 gpiochip_remove(&plgpio->chip); 610 unprepare_clk: 611 if (!IS_ERR(plgpio->clk)) 612 clk_unprepare(plgpio->clk); 613 614 return ret; 615 } 616 617 #ifdef CONFIG_PM_SLEEP 618 static int plgpio_suspend(struct device *dev) 619 { 620 struct plgpio *plgpio = dev_get_drvdata(dev); 621 int i, reg_count = DIV_ROUND_UP(plgpio->chip.ngpio, MAX_GPIO_PER_REG); 622 void __iomem *off; 623 624 for (i = 0; i < reg_count; i++) { 625 off = plgpio->base + i * sizeof(int *); 626 627 if (plgpio->regs.enb != -1) 628 plgpio->csave_regs[i].enb = 629 readl_relaxed(plgpio->regs.enb + off); 630 if (plgpio->regs.eit != -1) 631 plgpio->csave_regs[i].eit = 632 readl_relaxed(plgpio->regs.eit + off); 633 plgpio->csave_regs[i].wdata = readl_relaxed(plgpio->regs.wdata + 634 off); 635 plgpio->csave_regs[i].dir = readl_relaxed(plgpio->regs.dir + 636 off); 637 plgpio->csave_regs[i].ie = readl_relaxed(plgpio->regs.ie + off); 638 } 639 640 return 0; 641 } 642 643 /* 644 * This is used to correct the values in end registers. End registers contain 645 * extra bits that might be used for other purpose in platform. So, we shouldn't 646 * overwrite these bits. This macro, reads given register again, preserves other 647 * bit values (non-plgpio bits), and retain captured value (plgpio bits). 648 */ 649 #define plgpio_prepare_reg(__reg, _off, _mask, _tmp) \ 650 { \ 651 _tmp = readl_relaxed(plgpio->regs.__reg + _off); \ 652 _tmp &= ~_mask; \ 653 plgpio->csave_regs[i].__reg = \ 654 _tmp | (plgpio->csave_regs[i].__reg & _mask); \ 655 } 656 657 static int plgpio_resume(struct device *dev) 658 { 659 struct plgpio *plgpio = dev_get_drvdata(dev); 660 int i, reg_count = DIV_ROUND_UP(plgpio->chip.ngpio, MAX_GPIO_PER_REG); 661 void __iomem *off; 662 u32 mask, tmp; 663 664 for (i = 0; i < reg_count; i++) { 665 off = plgpio->base + i * sizeof(int *); 666 667 if (i == reg_count - 1) { 668 mask = (1 << (plgpio->chip.ngpio - i * 669 MAX_GPIO_PER_REG)) - 1; 670 671 if (plgpio->regs.enb != -1) 672 plgpio_prepare_reg(enb, off, mask, tmp); 673 674 if (plgpio->regs.eit != -1) 675 plgpio_prepare_reg(eit, off, mask, tmp); 676 677 plgpio_prepare_reg(wdata, off, mask, tmp); 678 plgpio_prepare_reg(dir, off, mask, tmp); 679 plgpio_prepare_reg(ie, off, mask, tmp); 680 } 681 682 writel_relaxed(plgpio->csave_regs[i].wdata, plgpio->regs.wdata + 683 off); 684 writel_relaxed(plgpio->csave_regs[i].dir, plgpio->regs.dir + 685 off); 686 687 if (plgpio->regs.eit != -1) 688 writel_relaxed(plgpio->csave_regs[i].eit, 689 plgpio->regs.eit + off); 690 691 writel_relaxed(plgpio->csave_regs[i].ie, plgpio->regs.ie + off); 692 693 if (plgpio->regs.enb != -1) 694 writel_relaxed(plgpio->csave_regs[i].enb, 695 plgpio->regs.enb + off); 696 } 697 698 return 0; 699 } 700 #endif 701 702 static SIMPLE_DEV_PM_OPS(plgpio_dev_pm_ops, plgpio_suspend, plgpio_resume); 703 704 static const struct of_device_id plgpio_of_match[] = { 705 { .compatible = "st,spear-plgpio" }, 706 {} 707 }; 708 MODULE_DEVICE_TABLE(of, plgpio_of_match); 709 710 static struct platform_driver plgpio_driver = { 711 .probe = plgpio_probe, 712 .driver = { 713 .name = "spear-plgpio", 714 .pm = &plgpio_dev_pm_ops, 715 .of_match_table = plgpio_of_match, 716 }, 717 }; 718 719 static int __init plgpio_init(void) 720 { 721 return platform_driver_register(&plgpio_driver); 722 } 723 subsys_initcall(plgpio_init); 724 725 MODULE_AUTHOR("Viresh Kumar <viresh.kumar@linaro.org>"); 726 MODULE_DESCRIPTION("STMicroelectronics SPEAr PLGPIO driver"); 727 MODULE_LICENSE("GPL"); 728