1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Xilinx gpio driver for xps/axi_gpio IP. 4 * 5 * Copyright 2008 - 2013 Xilinx, Inc. 6 */ 7 8 #include <linux/bitmap.h> 9 #include <linux/bitops.h> 10 #include <linux/clk.h> 11 #include <linux/errno.h> 12 #include <linux/gpio/driver.h> 13 #include <linux/init.h> 14 #include <linux/interrupt.h> 15 #include <linux/io.h> 16 #include <linux/irq.h> 17 #include <linux/module.h> 18 #include <linux/of_device.h> 19 #include <linux/of_platform.h> 20 #include <linux/pm_runtime.h> 21 #include <linux/slab.h> 22 23 /* Register Offset Definitions */ 24 #define XGPIO_DATA_OFFSET (0x0) /* Data register */ 25 #define XGPIO_TRI_OFFSET (0x4) /* I/O direction register */ 26 27 #define XGPIO_CHANNEL0_OFFSET 0x0 28 #define XGPIO_CHANNEL1_OFFSET 0x8 29 30 #define XGPIO_GIER_OFFSET 0x11c /* Global Interrupt Enable */ 31 #define XGPIO_GIER_IE BIT(31) 32 #define XGPIO_IPISR_OFFSET 0x120 /* IP Interrupt Status */ 33 #define XGPIO_IPIER_OFFSET 0x128 /* IP Interrupt Enable */ 34 35 /* Read/Write access to the GPIO registers */ 36 #if defined(CONFIG_ARCH_ZYNQ) || defined(CONFIG_X86) 37 # define xgpio_readreg(offset) readl(offset) 38 # define xgpio_writereg(offset, val) writel(val, offset) 39 #else 40 # define xgpio_readreg(offset) __raw_readl(offset) 41 # define xgpio_writereg(offset, val) __raw_writel(val, offset) 42 #endif 43 44 /** 45 * struct xgpio_instance - Stores information about GPIO device 46 * @gc: GPIO chip 47 * @regs: register block 48 * @hw_map: GPIO pin mapping on hardware side 49 * @sw_map: GPIO pin mapping on software side 50 * @state: GPIO write state shadow register 51 * @last_irq_read: GPIO read state register from last interrupt 52 * @dir: GPIO direction shadow register 53 * @gpio_lock: Lock used for synchronization 54 * @irq: IRQ used by GPIO device 55 * @irqchip: IRQ chip 56 * @enable: GPIO IRQ enable/disable bitfield 57 * @rising_edge: GPIO IRQ rising edge enable/disable bitfield 58 * @falling_edge: GPIO IRQ falling edge enable/disable bitfield 59 * @clk: clock resource for this driver 60 */ 61 struct xgpio_instance { 62 struct gpio_chip gc; 63 void __iomem *regs; 64 DECLARE_BITMAP(hw_map, 64); 65 DECLARE_BITMAP(sw_map, 64); 66 DECLARE_BITMAP(state, 64); 67 DECLARE_BITMAP(last_irq_read, 64); 68 DECLARE_BITMAP(dir, 64); 69 spinlock_t gpio_lock; /* For serializing operations */ 70 int irq; 71 DECLARE_BITMAP(enable, 64); 72 DECLARE_BITMAP(rising_edge, 64); 73 DECLARE_BITMAP(falling_edge, 64); 74 struct clk *clk; 75 }; 76 77 static inline int xgpio_from_bit(struct xgpio_instance *chip, int bit) 78 { 79 return bitmap_bitremap(bit, chip->hw_map, chip->sw_map, 64); 80 } 81 82 static inline int xgpio_to_bit(struct xgpio_instance *chip, int gpio) 83 { 84 return bitmap_bitremap(gpio, chip->sw_map, chip->hw_map, 64); 85 } 86 87 static inline u32 xgpio_get_value32(const unsigned long *map, int bit) 88 { 89 const size_t index = BIT_WORD(bit); 90 const unsigned long offset = (bit % BITS_PER_LONG) & BIT(5); 91 92 return (map[index] >> offset) & 0xFFFFFFFFul; 93 } 94 95 static inline void xgpio_set_value32(unsigned long *map, int bit, u32 v) 96 { 97 const size_t index = BIT_WORD(bit); 98 const unsigned long offset = (bit % BITS_PER_LONG) & BIT(5); 99 100 map[index] &= ~(0xFFFFFFFFul << offset); 101 map[index] |= (unsigned long)v << offset; 102 } 103 104 static inline int xgpio_regoffset(struct xgpio_instance *chip, int ch) 105 { 106 switch (ch) { 107 case 0: 108 return XGPIO_CHANNEL0_OFFSET; 109 case 1: 110 return XGPIO_CHANNEL1_OFFSET; 111 default: 112 return -EINVAL; 113 } 114 } 115 116 static void xgpio_read_ch(struct xgpio_instance *chip, int reg, int bit, unsigned long *a) 117 { 118 void __iomem *addr = chip->regs + reg + xgpio_regoffset(chip, bit / 32); 119 120 xgpio_set_value32(a, bit, xgpio_readreg(addr)); 121 } 122 123 static void xgpio_write_ch(struct xgpio_instance *chip, int reg, int bit, unsigned long *a) 124 { 125 void __iomem *addr = chip->regs + reg + xgpio_regoffset(chip, bit / 32); 126 127 xgpio_writereg(addr, xgpio_get_value32(a, bit)); 128 } 129 130 static void xgpio_read_ch_all(struct xgpio_instance *chip, int reg, unsigned long *a) 131 { 132 int bit, lastbit = xgpio_to_bit(chip, chip->gc.ngpio - 1); 133 134 for (bit = 0; bit <= lastbit ; bit += 32) 135 xgpio_read_ch(chip, reg, bit, a); 136 } 137 138 static void xgpio_write_ch_all(struct xgpio_instance *chip, int reg, unsigned long *a) 139 { 140 int bit, lastbit = xgpio_to_bit(chip, chip->gc.ngpio - 1); 141 142 for (bit = 0; bit <= lastbit ; bit += 32) 143 xgpio_write_ch(chip, reg, bit, a); 144 } 145 146 /** 147 * xgpio_get - Read the specified signal of the GPIO device. 148 * @gc: Pointer to gpio_chip device structure. 149 * @gpio: GPIO signal number. 150 * 151 * This function reads the specified signal of the GPIO device. 152 * 153 * Return: 154 * 0 if direction of GPIO signals is set as input otherwise it 155 * returns negative error value. 156 */ 157 static int xgpio_get(struct gpio_chip *gc, unsigned int gpio) 158 { 159 struct xgpio_instance *chip = gpiochip_get_data(gc); 160 int bit = xgpio_to_bit(chip, gpio); 161 DECLARE_BITMAP(state, 64); 162 163 xgpio_read_ch(chip, XGPIO_DATA_OFFSET, bit, state); 164 165 return test_bit(bit, state); 166 } 167 168 /** 169 * xgpio_set - Write the specified signal of the GPIO device. 170 * @gc: Pointer to gpio_chip device structure. 171 * @gpio: GPIO signal number. 172 * @val: Value to be written to specified signal. 173 * 174 * This function writes the specified value in to the specified signal of the 175 * GPIO device. 176 */ 177 static void xgpio_set(struct gpio_chip *gc, unsigned int gpio, int val) 178 { 179 unsigned long flags; 180 struct xgpio_instance *chip = gpiochip_get_data(gc); 181 int bit = xgpio_to_bit(chip, gpio); 182 183 spin_lock_irqsave(&chip->gpio_lock, flags); 184 185 /* Write to GPIO signal and set its direction to output */ 186 __assign_bit(bit, chip->state, val); 187 188 xgpio_write_ch(chip, XGPIO_DATA_OFFSET, bit, chip->state); 189 190 spin_unlock_irqrestore(&chip->gpio_lock, flags); 191 } 192 193 /** 194 * xgpio_set_multiple - Write the specified signals of the GPIO device. 195 * @gc: Pointer to gpio_chip device structure. 196 * @mask: Mask of the GPIOS to modify. 197 * @bits: Value to be wrote on each GPIO 198 * 199 * This function writes the specified values into the specified signals of the 200 * GPIO devices. 201 */ 202 static void xgpio_set_multiple(struct gpio_chip *gc, unsigned long *mask, 203 unsigned long *bits) 204 { 205 DECLARE_BITMAP(hw_mask, 64); 206 DECLARE_BITMAP(hw_bits, 64); 207 DECLARE_BITMAP(state, 64); 208 unsigned long flags; 209 struct xgpio_instance *chip = gpiochip_get_data(gc); 210 211 bitmap_remap(hw_mask, mask, chip->sw_map, chip->hw_map, 64); 212 bitmap_remap(hw_bits, bits, chip->sw_map, chip->hw_map, 64); 213 214 spin_lock_irqsave(&chip->gpio_lock, flags); 215 216 bitmap_replace(state, chip->state, hw_bits, hw_mask, 64); 217 218 xgpio_write_ch_all(chip, XGPIO_DATA_OFFSET, state); 219 220 bitmap_copy(chip->state, state, 64); 221 222 spin_unlock_irqrestore(&chip->gpio_lock, flags); 223 } 224 225 /** 226 * xgpio_dir_in - Set the direction of the specified GPIO signal as input. 227 * @gc: Pointer to gpio_chip device structure. 228 * @gpio: GPIO signal number. 229 * 230 * Return: 231 * 0 - if direction of GPIO signals is set as input 232 * otherwise it returns negative error value. 233 */ 234 static int xgpio_dir_in(struct gpio_chip *gc, unsigned int gpio) 235 { 236 unsigned long flags; 237 struct xgpio_instance *chip = gpiochip_get_data(gc); 238 int bit = xgpio_to_bit(chip, gpio); 239 240 spin_lock_irqsave(&chip->gpio_lock, flags); 241 242 /* Set the GPIO bit in shadow register and set direction as input */ 243 __set_bit(bit, chip->dir); 244 xgpio_write_ch(chip, XGPIO_TRI_OFFSET, bit, chip->dir); 245 246 spin_unlock_irqrestore(&chip->gpio_lock, flags); 247 248 return 0; 249 } 250 251 /** 252 * xgpio_dir_out - Set the direction of the specified GPIO signal as output. 253 * @gc: Pointer to gpio_chip device structure. 254 * @gpio: GPIO signal number. 255 * @val: Value to be written to specified signal. 256 * 257 * This function sets the direction of specified GPIO signal as output. 258 * 259 * Return: 260 * If all GPIO signals of GPIO chip is configured as input then it returns 261 * error otherwise it returns 0. 262 */ 263 static int xgpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val) 264 { 265 unsigned long flags; 266 struct xgpio_instance *chip = gpiochip_get_data(gc); 267 int bit = xgpio_to_bit(chip, gpio); 268 269 spin_lock_irqsave(&chip->gpio_lock, flags); 270 271 /* Write state of GPIO signal */ 272 __assign_bit(bit, chip->state, val); 273 xgpio_write_ch(chip, XGPIO_DATA_OFFSET, bit, chip->state); 274 275 /* Clear the GPIO bit in shadow register and set direction as output */ 276 __clear_bit(bit, chip->dir); 277 xgpio_write_ch(chip, XGPIO_TRI_OFFSET, bit, chip->dir); 278 279 spin_unlock_irqrestore(&chip->gpio_lock, flags); 280 281 return 0; 282 } 283 284 /** 285 * xgpio_save_regs - Set initial values of GPIO pins 286 * @chip: Pointer to GPIO instance 287 */ 288 static void xgpio_save_regs(struct xgpio_instance *chip) 289 { 290 xgpio_write_ch_all(chip, XGPIO_DATA_OFFSET, chip->state); 291 xgpio_write_ch_all(chip, XGPIO_TRI_OFFSET, chip->dir); 292 } 293 294 static int xgpio_request(struct gpio_chip *chip, unsigned int offset) 295 { 296 int ret; 297 298 ret = pm_runtime_get_sync(chip->parent); 299 /* 300 * If the device is already active pm_runtime_get() will return 1 on 301 * success, but gpio_request still needs to return 0. 302 */ 303 return ret < 0 ? ret : 0; 304 } 305 306 static void xgpio_free(struct gpio_chip *chip, unsigned int offset) 307 { 308 pm_runtime_put(chip->parent); 309 } 310 311 static int __maybe_unused xgpio_suspend(struct device *dev) 312 { 313 struct xgpio_instance *gpio = dev_get_drvdata(dev); 314 struct irq_data *data = irq_get_irq_data(gpio->irq); 315 316 if (!data) { 317 dev_dbg(dev, "IRQ not connected\n"); 318 return pm_runtime_force_suspend(dev); 319 } 320 321 if (!irqd_is_wakeup_set(data)) 322 return pm_runtime_force_suspend(dev); 323 324 return 0; 325 } 326 327 /** 328 * xgpio_remove - Remove method for the GPIO device. 329 * @pdev: pointer to the platform device 330 * 331 * This function remove gpiochips and frees all the allocated resources. 332 * 333 * Return: 0 always 334 */ 335 static int xgpio_remove(struct platform_device *pdev) 336 { 337 struct xgpio_instance *gpio = platform_get_drvdata(pdev); 338 339 pm_runtime_get_sync(&pdev->dev); 340 pm_runtime_put_noidle(&pdev->dev); 341 pm_runtime_disable(&pdev->dev); 342 clk_disable_unprepare(gpio->clk); 343 344 return 0; 345 } 346 347 /** 348 * xgpio_irq_ack - Acknowledge a child GPIO interrupt. 349 * @irq_data: per IRQ and chip data passed down to chip functions 350 * This currently does nothing, but irq_ack is unconditionally called by 351 * handle_edge_irq and therefore must be defined. 352 */ 353 static void xgpio_irq_ack(struct irq_data *irq_data) 354 { 355 } 356 357 static int __maybe_unused xgpio_resume(struct device *dev) 358 { 359 struct xgpio_instance *gpio = dev_get_drvdata(dev); 360 struct irq_data *data = irq_get_irq_data(gpio->irq); 361 362 if (!data) { 363 dev_dbg(dev, "IRQ not connected\n"); 364 return pm_runtime_force_resume(dev); 365 } 366 367 if (!irqd_is_wakeup_set(data)) 368 return pm_runtime_force_resume(dev); 369 370 return 0; 371 } 372 373 static int __maybe_unused xgpio_runtime_suspend(struct device *dev) 374 { 375 struct xgpio_instance *gpio = dev_get_drvdata(dev); 376 377 clk_disable(gpio->clk); 378 379 return 0; 380 } 381 382 static int __maybe_unused xgpio_runtime_resume(struct device *dev) 383 { 384 struct xgpio_instance *gpio = dev_get_drvdata(dev); 385 386 return clk_enable(gpio->clk); 387 } 388 389 static const struct dev_pm_ops xgpio_dev_pm_ops = { 390 SET_SYSTEM_SLEEP_PM_OPS(xgpio_suspend, xgpio_resume) 391 SET_RUNTIME_PM_OPS(xgpio_runtime_suspend, 392 xgpio_runtime_resume, NULL) 393 }; 394 395 /** 396 * xgpio_irq_mask - Write the specified signal of the GPIO device. 397 * @irq_data: per IRQ and chip data passed down to chip functions 398 */ 399 static void xgpio_irq_mask(struct irq_data *irq_data) 400 { 401 unsigned long flags; 402 struct xgpio_instance *chip = irq_data_get_irq_chip_data(irq_data); 403 int irq_offset = irqd_to_hwirq(irq_data); 404 int bit = xgpio_to_bit(chip, irq_offset); 405 u32 mask = BIT(bit / 32), temp; 406 407 spin_lock_irqsave(&chip->gpio_lock, flags); 408 409 __clear_bit(bit, chip->enable); 410 411 if (xgpio_get_value32(chip->enable, bit) == 0) { 412 /* Disable per channel interrupt */ 413 temp = xgpio_readreg(chip->regs + XGPIO_IPIER_OFFSET); 414 temp &= ~mask; 415 xgpio_writereg(chip->regs + XGPIO_IPIER_OFFSET, temp); 416 } 417 spin_unlock_irqrestore(&chip->gpio_lock, flags); 418 419 gpiochip_disable_irq(&chip->gc, irq_offset); 420 } 421 422 /** 423 * xgpio_irq_unmask - Write the specified signal of the GPIO device. 424 * @irq_data: per IRQ and chip data passed down to chip functions 425 */ 426 static void xgpio_irq_unmask(struct irq_data *irq_data) 427 { 428 unsigned long flags; 429 struct xgpio_instance *chip = irq_data_get_irq_chip_data(irq_data); 430 int irq_offset = irqd_to_hwirq(irq_data); 431 int bit = xgpio_to_bit(chip, irq_offset); 432 u32 old_enable = xgpio_get_value32(chip->enable, bit); 433 u32 mask = BIT(bit / 32), val; 434 435 gpiochip_enable_irq(&chip->gc, irq_offset); 436 437 spin_lock_irqsave(&chip->gpio_lock, flags); 438 439 __set_bit(bit, chip->enable); 440 441 if (old_enable == 0) { 442 /* Clear any existing per-channel interrupts */ 443 val = xgpio_readreg(chip->regs + XGPIO_IPISR_OFFSET); 444 val &= mask; 445 xgpio_writereg(chip->regs + XGPIO_IPISR_OFFSET, val); 446 447 /* Update GPIO IRQ read data before enabling interrupt*/ 448 xgpio_read_ch(chip, XGPIO_DATA_OFFSET, bit, chip->last_irq_read); 449 450 /* Enable per channel interrupt */ 451 val = xgpio_readreg(chip->regs + XGPIO_IPIER_OFFSET); 452 val |= mask; 453 xgpio_writereg(chip->regs + XGPIO_IPIER_OFFSET, val); 454 } 455 456 spin_unlock_irqrestore(&chip->gpio_lock, flags); 457 } 458 459 /** 460 * xgpio_set_irq_type - Write the specified signal of the GPIO device. 461 * @irq_data: Per IRQ and chip data passed down to chip functions 462 * @type: Interrupt type that is to be set for the gpio pin 463 * 464 * Return: 465 * 0 if interrupt type is supported otherwise -EINVAL 466 */ 467 static int xgpio_set_irq_type(struct irq_data *irq_data, unsigned int type) 468 { 469 struct xgpio_instance *chip = irq_data_get_irq_chip_data(irq_data); 470 int irq_offset = irqd_to_hwirq(irq_data); 471 int bit = xgpio_to_bit(chip, irq_offset); 472 473 /* 474 * The Xilinx GPIO hardware provides a single interrupt status 475 * indication for any state change in a given GPIO channel (bank). 476 * Therefore, only rising edge or falling edge triggers are 477 * supported. 478 */ 479 switch (type & IRQ_TYPE_SENSE_MASK) { 480 case IRQ_TYPE_EDGE_BOTH: 481 __set_bit(bit, chip->rising_edge); 482 __set_bit(bit, chip->falling_edge); 483 break; 484 case IRQ_TYPE_EDGE_RISING: 485 __set_bit(bit, chip->rising_edge); 486 __clear_bit(bit, chip->falling_edge); 487 break; 488 case IRQ_TYPE_EDGE_FALLING: 489 __clear_bit(bit, chip->rising_edge); 490 __set_bit(bit, chip->falling_edge); 491 break; 492 default: 493 return -EINVAL; 494 } 495 496 irq_set_handler_locked(irq_data, handle_edge_irq); 497 return 0; 498 } 499 500 /** 501 * xgpio_irqhandler - Gpio interrupt service routine 502 * @desc: Pointer to interrupt description 503 */ 504 static void xgpio_irqhandler(struct irq_desc *desc) 505 { 506 struct xgpio_instance *chip = irq_desc_get_handler_data(desc); 507 struct gpio_chip *gc = &chip->gc; 508 struct irq_chip *irqchip = irq_desc_get_chip(desc); 509 DECLARE_BITMAP(rising, 64); 510 DECLARE_BITMAP(falling, 64); 511 DECLARE_BITMAP(all, 64); 512 int irq_offset; 513 u32 status; 514 u32 bit; 515 516 status = xgpio_readreg(chip->regs + XGPIO_IPISR_OFFSET); 517 xgpio_writereg(chip->regs + XGPIO_IPISR_OFFSET, status); 518 519 chained_irq_enter(irqchip, desc); 520 521 spin_lock(&chip->gpio_lock); 522 523 xgpio_read_ch_all(chip, XGPIO_DATA_OFFSET, all); 524 525 bitmap_complement(rising, chip->last_irq_read, 64); 526 bitmap_and(rising, rising, all, 64); 527 bitmap_and(rising, rising, chip->enable, 64); 528 bitmap_and(rising, rising, chip->rising_edge, 64); 529 530 bitmap_complement(falling, all, 64); 531 bitmap_and(falling, falling, chip->last_irq_read, 64); 532 bitmap_and(falling, falling, chip->enable, 64); 533 bitmap_and(falling, falling, chip->falling_edge, 64); 534 535 bitmap_copy(chip->last_irq_read, all, 64); 536 bitmap_or(all, rising, falling, 64); 537 538 spin_unlock(&chip->gpio_lock); 539 540 dev_dbg(gc->parent, "IRQ rising %*pb falling %*pb\n", 64, rising, 64, falling); 541 542 for_each_set_bit(bit, all, 64) { 543 irq_offset = xgpio_from_bit(chip, bit); 544 generic_handle_domain_irq(gc->irq.domain, irq_offset); 545 } 546 547 chained_irq_exit(irqchip, desc); 548 } 549 550 static const struct irq_chip xgpio_irq_chip = { 551 .name = "gpio-xilinx", 552 .irq_ack = xgpio_irq_ack, 553 .irq_mask = xgpio_irq_mask, 554 .irq_unmask = xgpio_irq_unmask, 555 .irq_set_type = xgpio_set_irq_type, 556 .flags = IRQCHIP_IMMUTABLE, 557 GPIOCHIP_IRQ_RESOURCE_HELPERS, 558 }; 559 560 /** 561 * xgpio_probe - Probe method for the GPIO device. 562 * @pdev: pointer to the platform device 563 * 564 * Return: 565 * It returns 0, if the driver is bound to the GPIO device, or 566 * a negative value if there is an error. 567 */ 568 static int xgpio_probe(struct platform_device *pdev) 569 { 570 struct xgpio_instance *chip; 571 int status = 0; 572 struct device_node *np = pdev->dev.of_node; 573 u32 is_dual = 0; 574 u32 width[2]; 575 u32 state[2]; 576 u32 dir[2]; 577 struct gpio_irq_chip *girq; 578 u32 temp; 579 580 chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL); 581 if (!chip) 582 return -ENOMEM; 583 584 platform_set_drvdata(pdev, chip); 585 586 /* First, check if the device is dual-channel */ 587 of_property_read_u32(np, "xlnx,is-dual", &is_dual); 588 589 /* Setup defaults */ 590 memset32(width, 0, ARRAY_SIZE(width)); 591 memset32(state, 0, ARRAY_SIZE(state)); 592 memset32(dir, 0xFFFFFFFF, ARRAY_SIZE(dir)); 593 594 /* Update GPIO state shadow register with default value */ 595 of_property_read_u32(np, "xlnx,dout-default", &state[0]); 596 of_property_read_u32(np, "xlnx,dout-default-2", &state[1]); 597 598 bitmap_from_arr32(chip->state, state, 64); 599 600 /* Update GPIO direction shadow register with default value */ 601 of_property_read_u32(np, "xlnx,tri-default", &dir[0]); 602 of_property_read_u32(np, "xlnx,tri-default-2", &dir[1]); 603 604 bitmap_from_arr32(chip->dir, dir, 64); 605 606 /* 607 * Check device node and parent device node for device width 608 * and assume default width of 32 609 */ 610 if (of_property_read_u32(np, "xlnx,gpio-width", &width[0])) 611 width[0] = 32; 612 613 if (width[0] > 32) 614 return -EINVAL; 615 616 if (is_dual && of_property_read_u32(np, "xlnx,gpio2-width", &width[1])) 617 width[1] = 32; 618 619 if (width[1] > 32) 620 return -EINVAL; 621 622 /* Setup software pin mapping */ 623 bitmap_set(chip->sw_map, 0, width[0] + width[1]); 624 625 /* Setup hardware pin mapping */ 626 bitmap_set(chip->hw_map, 0, width[0]); 627 bitmap_set(chip->hw_map, 32, width[1]); 628 629 spin_lock_init(&chip->gpio_lock); 630 631 chip->gc.base = -1; 632 chip->gc.ngpio = bitmap_weight(chip->hw_map, 64); 633 chip->gc.parent = &pdev->dev; 634 chip->gc.direction_input = xgpio_dir_in; 635 chip->gc.direction_output = xgpio_dir_out; 636 chip->gc.get = xgpio_get; 637 chip->gc.set = xgpio_set; 638 chip->gc.request = xgpio_request; 639 chip->gc.free = xgpio_free; 640 chip->gc.set_multiple = xgpio_set_multiple; 641 642 chip->gc.label = dev_name(&pdev->dev); 643 644 chip->regs = devm_platform_ioremap_resource(pdev, 0); 645 if (IS_ERR(chip->regs)) { 646 dev_err(&pdev->dev, "failed to ioremap memory resource\n"); 647 return PTR_ERR(chip->regs); 648 } 649 650 chip->clk = devm_clk_get_optional(&pdev->dev, NULL); 651 if (IS_ERR(chip->clk)) 652 return dev_err_probe(&pdev->dev, PTR_ERR(chip->clk), "input clock not found.\n"); 653 654 status = clk_prepare_enable(chip->clk); 655 if (status < 0) { 656 dev_err(&pdev->dev, "Failed to prepare clk\n"); 657 return status; 658 } 659 pm_runtime_get_noresume(&pdev->dev); 660 pm_runtime_set_active(&pdev->dev); 661 pm_runtime_enable(&pdev->dev); 662 663 xgpio_save_regs(chip); 664 665 chip->irq = platform_get_irq_optional(pdev, 0); 666 if (chip->irq <= 0) 667 goto skip_irq; 668 669 /* Disable per-channel interrupts */ 670 xgpio_writereg(chip->regs + XGPIO_IPIER_OFFSET, 0); 671 /* Clear any existing per-channel interrupts */ 672 temp = xgpio_readreg(chip->regs + XGPIO_IPISR_OFFSET); 673 xgpio_writereg(chip->regs + XGPIO_IPISR_OFFSET, temp); 674 /* Enable global interrupts */ 675 xgpio_writereg(chip->regs + XGPIO_GIER_OFFSET, XGPIO_GIER_IE); 676 677 girq = &chip->gc.irq; 678 gpio_irq_chip_set_chip(girq, &xgpio_irq_chip); 679 girq->parent_handler = xgpio_irqhandler; 680 girq->num_parents = 1; 681 girq->parents = devm_kcalloc(&pdev->dev, 1, 682 sizeof(*girq->parents), 683 GFP_KERNEL); 684 if (!girq->parents) { 685 status = -ENOMEM; 686 goto err_pm_put; 687 } 688 girq->parents[0] = chip->irq; 689 girq->default_type = IRQ_TYPE_NONE; 690 girq->handler = handle_bad_irq; 691 692 skip_irq: 693 status = devm_gpiochip_add_data(&pdev->dev, &chip->gc, chip); 694 if (status) { 695 dev_err(&pdev->dev, "failed to add GPIO chip\n"); 696 goto err_pm_put; 697 } 698 699 pm_runtime_put(&pdev->dev); 700 return 0; 701 702 err_pm_put: 703 pm_runtime_disable(&pdev->dev); 704 pm_runtime_put_noidle(&pdev->dev); 705 clk_disable_unprepare(chip->clk); 706 return status; 707 } 708 709 static const struct of_device_id xgpio_of_match[] = { 710 { .compatible = "xlnx,xps-gpio-1.00.a", }, 711 { /* end of list */ }, 712 }; 713 714 MODULE_DEVICE_TABLE(of, xgpio_of_match); 715 716 static struct platform_driver xgpio_plat_driver = { 717 .probe = xgpio_probe, 718 .remove = xgpio_remove, 719 .driver = { 720 .name = "gpio-xilinx", 721 .of_match_table = xgpio_of_match, 722 .pm = &xgpio_dev_pm_ops, 723 }, 724 }; 725 726 static int __init xgpio_init(void) 727 { 728 return platform_driver_register(&xgpio_plat_driver); 729 } 730 731 subsys_initcall(xgpio_init); 732 733 static void __exit xgpio_exit(void) 734 { 735 platform_driver_unregister(&xgpio_plat_driver); 736 } 737 module_exit(xgpio_exit); 738 739 MODULE_AUTHOR("Xilinx, Inc."); 740 MODULE_DESCRIPTION("Xilinx GPIO driver"); 741 MODULE_LICENSE("GPL"); 742