1 /* 2 * GPIO driver for Marvell SoCs 3 * 4 * Copyright (C) 2012 Marvell 5 * 6 * Thomas Petazzoni <thomas.petazzoni@free-electrons.com> 7 * Andrew Lunn <andrew@lunn.ch> 8 * Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> 9 * 10 * This file is licensed under the terms of the GNU General Public 11 * License version 2. This program is licensed "as is" without any 12 * warranty of any kind, whether express or implied. 13 * 14 * This driver is a fairly straightforward GPIO driver for the 15 * complete family of Marvell EBU SoC platforms (Orion, Dove, 16 * Kirkwood, Discovery, Armada 370/XP). The only complexity of this 17 * driver is the different register layout that exists between the 18 * non-SMP platforms (Orion, Dove, Kirkwood, Armada 370) and the SMP 19 * platforms (MV78200 from the Discovery family and the Armada 20 * XP). Therefore, this driver handles three variants of the GPIO 21 * block: 22 * - the basic variant, called "orion-gpio", with the simplest 23 * register set. Used on Orion, Dove, Kirkwoord, Armada 370 and 24 * non-SMP Discovery systems 25 * - the mv78200 variant for MV78200 Discovery systems. This variant 26 * turns the edge mask and level mask registers into CPU0 edge 27 * mask/level mask registers, and adds CPU1 edge mask/level mask 28 * registers. 29 * - the armadaxp variant for Armada XP systems. This variant keeps 30 * the normal cause/edge mask/level mask registers when the global 31 * interrupts are used, but adds per-CPU cause/edge mask/level mask 32 * registers n a separate memory area for the per-CPU GPIO 33 * interrupts. 34 */ 35 36 #include <linux/bitops.h> 37 #include <linux/clk.h> 38 #include <linux/err.h> 39 #include <linux/gpio/driver.h> 40 #include <linux/gpio/consumer.h> 41 #include <linux/init.h> 42 #include <linux/io.h> 43 #include <linux/irq.h> 44 #include <linux/irqchip/chained_irq.h> 45 #include <linux/irqdomain.h> 46 #include <linux/mfd/syscon.h> 47 #include <linux/of_device.h> 48 #include <linux/of_irq.h> 49 #include <linux/pinctrl/consumer.h> 50 #include <linux/platform_device.h> 51 #include <linux/pwm.h> 52 #include <linux/regmap.h> 53 #include <linux/slab.h> 54 55 /* 56 * GPIO unit register offsets. 57 */ 58 #define GPIO_OUT_OFF 0x0000 59 #define GPIO_IO_CONF_OFF 0x0004 60 #define GPIO_BLINK_EN_OFF 0x0008 61 #define GPIO_IN_POL_OFF 0x000c 62 #define GPIO_DATA_IN_OFF 0x0010 63 #define GPIO_EDGE_CAUSE_OFF 0x0014 64 #define GPIO_EDGE_MASK_OFF 0x0018 65 #define GPIO_LEVEL_MASK_OFF 0x001c 66 #define GPIO_BLINK_CNT_SELECT_OFF 0x0020 67 68 /* 69 * PWM register offsets. 70 */ 71 #define PWM_BLINK_ON_DURATION_OFF 0x0 72 #define PWM_BLINK_OFF_DURATION_OFF 0x4 73 74 75 /* The MV78200 has per-CPU registers for edge mask and level mask */ 76 #define GPIO_EDGE_MASK_MV78200_OFF(cpu) ((cpu) ? 0x30 : 0x18) 77 #define GPIO_LEVEL_MASK_MV78200_OFF(cpu) ((cpu) ? 0x34 : 0x1C) 78 79 /* 80 * The Armada XP has per-CPU registers for interrupt cause, interrupt 81 * mask and interrupt level mask. Those are relative to the 82 * percpu_membase. 83 */ 84 #define GPIO_EDGE_CAUSE_ARMADAXP_OFF(cpu) ((cpu) * 0x4) 85 #define GPIO_EDGE_MASK_ARMADAXP_OFF(cpu) (0x10 + (cpu) * 0x4) 86 #define GPIO_LEVEL_MASK_ARMADAXP_OFF(cpu) (0x20 + (cpu) * 0x4) 87 88 #define MVEBU_GPIO_SOC_VARIANT_ORION 0x1 89 #define MVEBU_GPIO_SOC_VARIANT_MV78200 0x2 90 #define MVEBU_GPIO_SOC_VARIANT_ARMADAXP 0x3 91 #define MVEBU_GPIO_SOC_VARIANT_A8K 0x4 92 93 #define MVEBU_MAX_GPIO_PER_BANK 32 94 95 struct mvebu_pwm { 96 void __iomem *membase; 97 unsigned long clk_rate; 98 struct gpio_desc *gpiod; 99 struct pwm_chip chip; 100 spinlock_t lock; 101 struct mvebu_gpio_chip *mvchip; 102 103 /* Used to preserve GPIO/PWM registers across suspend/resume */ 104 u32 blink_select; 105 u32 blink_on_duration; 106 u32 blink_off_duration; 107 }; 108 109 struct mvebu_gpio_chip { 110 struct gpio_chip chip; 111 struct regmap *regs; 112 u32 offset; 113 struct regmap *percpu_regs; 114 int irqbase; 115 struct irq_domain *domain; 116 int soc_variant; 117 118 /* Used for PWM support */ 119 struct clk *clk; 120 struct mvebu_pwm *mvpwm; 121 122 /* Used to preserve GPIO registers across suspend/resume */ 123 u32 out_reg; 124 u32 io_conf_reg; 125 u32 blink_en_reg; 126 u32 in_pol_reg; 127 u32 edge_mask_regs[4]; 128 u32 level_mask_regs[4]; 129 }; 130 131 /* 132 * Functions returning addresses of individual registers for a given 133 * GPIO controller. 134 */ 135 136 static void mvebu_gpioreg_edge_cause(struct mvebu_gpio_chip *mvchip, 137 struct regmap **map, unsigned int *offset) 138 { 139 int cpu; 140 141 switch (mvchip->soc_variant) { 142 case MVEBU_GPIO_SOC_VARIANT_ORION: 143 case MVEBU_GPIO_SOC_VARIANT_MV78200: 144 case MVEBU_GPIO_SOC_VARIANT_A8K: 145 *map = mvchip->regs; 146 *offset = GPIO_EDGE_CAUSE_OFF + mvchip->offset; 147 break; 148 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP: 149 cpu = smp_processor_id(); 150 *map = mvchip->percpu_regs; 151 *offset = GPIO_EDGE_CAUSE_ARMADAXP_OFF(cpu); 152 break; 153 default: 154 BUG(); 155 } 156 } 157 158 static u32 159 mvebu_gpio_read_edge_cause(struct mvebu_gpio_chip *mvchip) 160 { 161 struct regmap *map; 162 unsigned int offset; 163 u32 val; 164 165 mvebu_gpioreg_edge_cause(mvchip, &map, &offset); 166 regmap_read(map, offset, &val); 167 168 return val; 169 } 170 171 static void 172 mvebu_gpio_write_edge_cause(struct mvebu_gpio_chip *mvchip, u32 val) 173 { 174 struct regmap *map; 175 unsigned int offset; 176 177 mvebu_gpioreg_edge_cause(mvchip, &map, &offset); 178 regmap_write(map, offset, val); 179 } 180 181 static inline void 182 mvebu_gpioreg_edge_mask(struct mvebu_gpio_chip *mvchip, 183 struct regmap **map, unsigned int *offset) 184 { 185 int cpu; 186 187 switch (mvchip->soc_variant) { 188 case MVEBU_GPIO_SOC_VARIANT_ORION: 189 case MVEBU_GPIO_SOC_VARIANT_A8K: 190 *map = mvchip->regs; 191 *offset = GPIO_EDGE_MASK_OFF + mvchip->offset; 192 break; 193 case MVEBU_GPIO_SOC_VARIANT_MV78200: 194 cpu = smp_processor_id(); 195 *map = mvchip->regs; 196 *offset = GPIO_EDGE_MASK_MV78200_OFF(cpu); 197 break; 198 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP: 199 cpu = smp_processor_id(); 200 *map = mvchip->percpu_regs; 201 *offset = GPIO_EDGE_MASK_ARMADAXP_OFF(cpu); 202 break; 203 default: 204 BUG(); 205 } 206 } 207 208 static u32 209 mvebu_gpio_read_edge_mask(struct mvebu_gpio_chip *mvchip) 210 { 211 struct regmap *map; 212 unsigned int offset; 213 u32 val; 214 215 mvebu_gpioreg_edge_mask(mvchip, &map, &offset); 216 regmap_read(map, offset, &val); 217 218 return val; 219 } 220 221 static void 222 mvebu_gpio_write_edge_mask(struct mvebu_gpio_chip *mvchip, u32 val) 223 { 224 struct regmap *map; 225 unsigned int offset; 226 227 mvebu_gpioreg_edge_mask(mvchip, &map, &offset); 228 regmap_write(map, offset, val); 229 } 230 231 static void 232 mvebu_gpioreg_level_mask(struct mvebu_gpio_chip *mvchip, 233 struct regmap **map, unsigned int *offset) 234 { 235 int cpu; 236 237 switch (mvchip->soc_variant) { 238 case MVEBU_GPIO_SOC_VARIANT_ORION: 239 case MVEBU_GPIO_SOC_VARIANT_A8K: 240 *map = mvchip->regs; 241 *offset = GPIO_LEVEL_MASK_OFF + mvchip->offset; 242 break; 243 case MVEBU_GPIO_SOC_VARIANT_MV78200: 244 cpu = smp_processor_id(); 245 *map = mvchip->regs; 246 *offset = GPIO_LEVEL_MASK_MV78200_OFF(cpu); 247 break; 248 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP: 249 cpu = smp_processor_id(); 250 *map = mvchip->percpu_regs; 251 *offset = GPIO_LEVEL_MASK_ARMADAXP_OFF(cpu); 252 break; 253 default: 254 BUG(); 255 } 256 } 257 258 static u32 259 mvebu_gpio_read_level_mask(struct mvebu_gpio_chip *mvchip) 260 { 261 struct regmap *map; 262 unsigned int offset; 263 u32 val; 264 265 mvebu_gpioreg_level_mask(mvchip, &map, &offset); 266 regmap_read(map, offset, &val); 267 268 return val; 269 } 270 271 static void 272 mvebu_gpio_write_level_mask(struct mvebu_gpio_chip *mvchip, u32 val) 273 { 274 struct regmap *map; 275 unsigned int offset; 276 277 mvebu_gpioreg_level_mask(mvchip, &map, &offset); 278 regmap_write(map, offset, val); 279 } 280 281 /* 282 * Functions returning addresses of individual registers for a given 283 * PWM controller. 284 */ 285 static void __iomem *mvebu_pwmreg_blink_on_duration(struct mvebu_pwm *mvpwm) 286 { 287 return mvpwm->membase + PWM_BLINK_ON_DURATION_OFF; 288 } 289 290 static void __iomem *mvebu_pwmreg_blink_off_duration(struct mvebu_pwm *mvpwm) 291 { 292 return mvpwm->membase + PWM_BLINK_OFF_DURATION_OFF; 293 } 294 295 /* 296 * Functions implementing the gpio_chip methods 297 */ 298 static void mvebu_gpio_set(struct gpio_chip *chip, unsigned int pin, int value) 299 { 300 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip); 301 302 regmap_update_bits(mvchip->regs, GPIO_OUT_OFF + mvchip->offset, 303 BIT(pin), value ? BIT(pin) : 0); 304 } 305 306 static int mvebu_gpio_get(struct gpio_chip *chip, unsigned int pin) 307 { 308 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip); 309 u32 u; 310 311 regmap_read(mvchip->regs, GPIO_IO_CONF_OFF + mvchip->offset, &u); 312 313 if (u & BIT(pin)) { 314 u32 data_in, in_pol; 315 316 regmap_read(mvchip->regs, GPIO_DATA_IN_OFF + mvchip->offset, 317 &data_in); 318 regmap_read(mvchip->regs, GPIO_IN_POL_OFF + mvchip->offset, 319 &in_pol); 320 u = data_in ^ in_pol; 321 } else { 322 regmap_read(mvchip->regs, GPIO_OUT_OFF + mvchip->offset, &u); 323 } 324 325 return (u >> pin) & 1; 326 } 327 328 static void mvebu_gpio_blink(struct gpio_chip *chip, unsigned int pin, 329 int value) 330 { 331 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip); 332 333 regmap_update_bits(mvchip->regs, GPIO_BLINK_EN_OFF + mvchip->offset, 334 BIT(pin), value ? BIT(pin) : 0); 335 } 336 337 static int mvebu_gpio_direction_input(struct gpio_chip *chip, unsigned int pin) 338 { 339 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip); 340 int ret; 341 342 /* 343 * Check with the pinctrl driver whether this pin is usable as 344 * an input GPIO 345 */ 346 ret = pinctrl_gpio_direction_input(chip->base + pin); 347 if (ret) 348 return ret; 349 350 regmap_update_bits(mvchip->regs, GPIO_IO_CONF_OFF + mvchip->offset, 351 BIT(pin), BIT(pin)); 352 353 return 0; 354 } 355 356 static int mvebu_gpio_direction_output(struct gpio_chip *chip, unsigned int pin, 357 int value) 358 { 359 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip); 360 int ret; 361 362 /* 363 * Check with the pinctrl driver whether this pin is usable as 364 * an output GPIO 365 */ 366 ret = pinctrl_gpio_direction_output(chip->base + pin); 367 if (ret) 368 return ret; 369 370 mvebu_gpio_blink(chip, pin, 0); 371 mvebu_gpio_set(chip, pin, value); 372 373 regmap_update_bits(mvchip->regs, GPIO_IO_CONF_OFF + mvchip->offset, 374 BIT(pin), 0); 375 376 return 0; 377 } 378 379 static int mvebu_gpio_to_irq(struct gpio_chip *chip, unsigned int pin) 380 { 381 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip); 382 383 return irq_create_mapping(mvchip->domain, pin); 384 } 385 386 /* 387 * Functions implementing the irq_chip methods 388 */ 389 static void mvebu_gpio_irq_ack(struct irq_data *d) 390 { 391 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); 392 struct mvebu_gpio_chip *mvchip = gc->private; 393 u32 mask = d->mask; 394 395 irq_gc_lock(gc); 396 mvebu_gpio_write_edge_cause(mvchip, ~mask); 397 irq_gc_unlock(gc); 398 } 399 400 static void mvebu_gpio_edge_irq_mask(struct irq_data *d) 401 { 402 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); 403 struct mvebu_gpio_chip *mvchip = gc->private; 404 struct irq_chip_type *ct = irq_data_get_chip_type(d); 405 u32 mask = d->mask; 406 407 irq_gc_lock(gc); 408 ct->mask_cache_priv &= ~mask; 409 mvebu_gpio_write_edge_mask(mvchip, ct->mask_cache_priv); 410 irq_gc_unlock(gc); 411 } 412 413 static void mvebu_gpio_edge_irq_unmask(struct irq_data *d) 414 { 415 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); 416 struct mvebu_gpio_chip *mvchip = gc->private; 417 struct irq_chip_type *ct = irq_data_get_chip_type(d); 418 u32 mask = d->mask; 419 420 irq_gc_lock(gc); 421 ct->mask_cache_priv |= mask; 422 mvebu_gpio_write_edge_mask(mvchip, ct->mask_cache_priv); 423 irq_gc_unlock(gc); 424 } 425 426 static void mvebu_gpio_level_irq_mask(struct irq_data *d) 427 { 428 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); 429 struct mvebu_gpio_chip *mvchip = gc->private; 430 struct irq_chip_type *ct = irq_data_get_chip_type(d); 431 u32 mask = d->mask; 432 433 irq_gc_lock(gc); 434 ct->mask_cache_priv &= ~mask; 435 mvebu_gpio_write_level_mask(mvchip, ct->mask_cache_priv); 436 irq_gc_unlock(gc); 437 } 438 439 static void mvebu_gpio_level_irq_unmask(struct irq_data *d) 440 { 441 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); 442 struct mvebu_gpio_chip *mvchip = gc->private; 443 struct irq_chip_type *ct = irq_data_get_chip_type(d); 444 u32 mask = d->mask; 445 446 irq_gc_lock(gc); 447 ct->mask_cache_priv |= mask; 448 mvebu_gpio_write_level_mask(mvchip, ct->mask_cache_priv); 449 irq_gc_unlock(gc); 450 } 451 452 /***************************************************************************** 453 * MVEBU GPIO IRQ 454 * 455 * GPIO_IN_POL register controls whether GPIO_DATA_IN will hold the same 456 * value of the line or the opposite value. 457 * 458 * Level IRQ handlers: DATA_IN is used directly as cause register. 459 * Interrupt are masked by LEVEL_MASK registers. 460 * Edge IRQ handlers: Change in DATA_IN are latched in EDGE_CAUSE. 461 * Interrupt are masked by EDGE_MASK registers. 462 * Both-edge handlers: Similar to regular Edge handlers, but also swaps 463 * the polarity to catch the next line transaction. 464 * This is a race condition that might not perfectly 465 * work on some use cases. 466 * 467 * Every eight GPIO lines are grouped (OR'ed) before going up to main 468 * cause register. 469 * 470 * EDGE cause mask 471 * data-in /--------| |-----| |----\ 472 * -----| |----- ---- to main cause reg 473 * X \----------------| |----/ 474 * polarity LEVEL mask 475 * 476 ****************************************************************************/ 477 478 static int mvebu_gpio_irq_set_type(struct irq_data *d, unsigned int type) 479 { 480 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); 481 struct irq_chip_type *ct = irq_data_get_chip_type(d); 482 struct mvebu_gpio_chip *mvchip = gc->private; 483 int pin; 484 u32 u; 485 486 pin = d->hwirq; 487 488 regmap_read(mvchip->regs, GPIO_IO_CONF_OFF + mvchip->offset, &u); 489 if ((u & BIT(pin)) == 0) 490 return -EINVAL; 491 492 type &= IRQ_TYPE_SENSE_MASK; 493 if (type == IRQ_TYPE_NONE) 494 return -EINVAL; 495 496 /* Check if we need to change chip and handler */ 497 if (!(ct->type & type)) 498 if (irq_setup_alt_chip(d, type)) 499 return -EINVAL; 500 501 /* 502 * Configure interrupt polarity. 503 */ 504 switch (type) { 505 case IRQ_TYPE_EDGE_RISING: 506 case IRQ_TYPE_LEVEL_HIGH: 507 regmap_update_bits(mvchip->regs, 508 GPIO_IN_POL_OFF + mvchip->offset, 509 BIT(pin), 0); 510 break; 511 case IRQ_TYPE_EDGE_FALLING: 512 case IRQ_TYPE_LEVEL_LOW: 513 regmap_update_bits(mvchip->regs, 514 GPIO_IN_POL_OFF + mvchip->offset, 515 BIT(pin), BIT(pin)); 516 break; 517 case IRQ_TYPE_EDGE_BOTH: { 518 u32 data_in, in_pol, val; 519 520 regmap_read(mvchip->regs, 521 GPIO_IN_POL_OFF + mvchip->offset, &in_pol); 522 regmap_read(mvchip->regs, 523 GPIO_DATA_IN_OFF + mvchip->offset, &data_in); 524 525 /* 526 * set initial polarity based on current input level 527 */ 528 if ((data_in ^ in_pol) & BIT(pin)) 529 val = BIT(pin); /* falling */ 530 else 531 val = 0; /* raising */ 532 533 regmap_update_bits(mvchip->regs, 534 GPIO_IN_POL_OFF + mvchip->offset, 535 BIT(pin), val); 536 break; 537 } 538 } 539 return 0; 540 } 541 542 static void mvebu_gpio_irq_handler(struct irq_desc *desc) 543 { 544 struct mvebu_gpio_chip *mvchip = irq_desc_get_handler_data(desc); 545 struct irq_chip *chip = irq_desc_get_chip(desc); 546 u32 cause, type, data_in, level_mask, edge_cause, edge_mask; 547 int i; 548 549 if (mvchip == NULL) 550 return; 551 552 chained_irq_enter(chip, desc); 553 554 regmap_read(mvchip->regs, GPIO_DATA_IN_OFF + mvchip->offset, &data_in); 555 level_mask = mvebu_gpio_read_level_mask(mvchip); 556 edge_cause = mvebu_gpio_read_edge_cause(mvchip); 557 edge_mask = mvebu_gpio_read_edge_mask(mvchip); 558 559 cause = (data_in & level_mask) | (edge_cause & edge_mask); 560 561 for (i = 0; i < mvchip->chip.ngpio; i++) { 562 int irq; 563 564 irq = irq_find_mapping(mvchip->domain, i); 565 566 if (!(cause & BIT(i))) 567 continue; 568 569 type = irq_get_trigger_type(irq); 570 if ((type & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH) { 571 /* Swap polarity (race with GPIO line) */ 572 u32 polarity; 573 574 regmap_read(mvchip->regs, 575 GPIO_IN_POL_OFF + mvchip->offset, 576 &polarity); 577 polarity ^= BIT(i); 578 regmap_write(mvchip->regs, 579 GPIO_IN_POL_OFF + mvchip->offset, 580 polarity); 581 } 582 583 generic_handle_irq(irq); 584 } 585 586 chained_irq_exit(chip, desc); 587 } 588 589 /* 590 * Functions implementing the pwm_chip methods 591 */ 592 static struct mvebu_pwm *to_mvebu_pwm(struct pwm_chip *chip) 593 { 594 return container_of(chip, struct mvebu_pwm, chip); 595 } 596 597 static int mvebu_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm) 598 { 599 struct mvebu_pwm *mvpwm = to_mvebu_pwm(chip); 600 struct mvebu_gpio_chip *mvchip = mvpwm->mvchip; 601 struct gpio_desc *desc; 602 unsigned long flags; 603 int ret = 0; 604 605 spin_lock_irqsave(&mvpwm->lock, flags); 606 607 if (mvpwm->gpiod) { 608 ret = -EBUSY; 609 } else { 610 desc = gpiochip_request_own_desc(&mvchip->chip, 611 pwm->hwpwm, "mvebu-pwm", 0); 612 if (IS_ERR(desc)) { 613 ret = PTR_ERR(desc); 614 goto out; 615 } 616 617 ret = gpiod_direction_output(desc, 0); 618 if (ret) { 619 gpiochip_free_own_desc(desc); 620 goto out; 621 } 622 623 mvpwm->gpiod = desc; 624 } 625 out: 626 spin_unlock_irqrestore(&mvpwm->lock, flags); 627 return ret; 628 } 629 630 static void mvebu_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm) 631 { 632 struct mvebu_pwm *mvpwm = to_mvebu_pwm(chip); 633 unsigned long flags; 634 635 spin_lock_irqsave(&mvpwm->lock, flags); 636 gpiochip_free_own_desc(mvpwm->gpiod); 637 mvpwm->gpiod = NULL; 638 spin_unlock_irqrestore(&mvpwm->lock, flags); 639 } 640 641 static void mvebu_pwm_get_state(struct pwm_chip *chip, 642 struct pwm_device *pwm, 643 struct pwm_state *state) { 644 645 struct mvebu_pwm *mvpwm = to_mvebu_pwm(chip); 646 struct mvebu_gpio_chip *mvchip = mvpwm->mvchip; 647 unsigned long long val; 648 unsigned long flags; 649 u32 u; 650 651 spin_lock_irqsave(&mvpwm->lock, flags); 652 653 val = (unsigned long long) 654 readl_relaxed(mvebu_pwmreg_blink_on_duration(mvpwm)); 655 val *= NSEC_PER_SEC; 656 do_div(val, mvpwm->clk_rate); 657 if (val > UINT_MAX) 658 state->duty_cycle = UINT_MAX; 659 else if (val) 660 state->duty_cycle = val; 661 else 662 state->duty_cycle = 1; 663 664 val = (unsigned long long) 665 readl_relaxed(mvebu_pwmreg_blink_off_duration(mvpwm)); 666 val *= NSEC_PER_SEC; 667 do_div(val, mvpwm->clk_rate); 668 if (val < state->duty_cycle) { 669 state->period = 1; 670 } else { 671 val -= state->duty_cycle; 672 if (val > UINT_MAX) 673 state->period = UINT_MAX; 674 else if (val) 675 state->period = val; 676 else 677 state->period = 1; 678 } 679 680 regmap_read(mvchip->regs, GPIO_BLINK_EN_OFF + mvchip->offset, &u); 681 if (u) 682 state->enabled = true; 683 else 684 state->enabled = false; 685 686 spin_unlock_irqrestore(&mvpwm->lock, flags); 687 } 688 689 static int mvebu_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, 690 struct pwm_state *state) 691 { 692 struct mvebu_pwm *mvpwm = to_mvebu_pwm(chip); 693 struct mvebu_gpio_chip *mvchip = mvpwm->mvchip; 694 unsigned long long val; 695 unsigned long flags; 696 unsigned int on, off; 697 698 val = (unsigned long long) mvpwm->clk_rate * state->duty_cycle; 699 do_div(val, NSEC_PER_SEC); 700 if (val > UINT_MAX) 701 return -EINVAL; 702 if (val) 703 on = val; 704 else 705 on = 1; 706 707 val = (unsigned long long) mvpwm->clk_rate * 708 (state->period - state->duty_cycle); 709 do_div(val, NSEC_PER_SEC); 710 if (val > UINT_MAX) 711 return -EINVAL; 712 if (val) 713 off = val; 714 else 715 off = 1; 716 717 spin_lock_irqsave(&mvpwm->lock, flags); 718 719 writel_relaxed(on, mvebu_pwmreg_blink_on_duration(mvpwm)); 720 writel_relaxed(off, mvebu_pwmreg_blink_off_duration(mvpwm)); 721 if (state->enabled) 722 mvebu_gpio_blink(&mvchip->chip, pwm->hwpwm, 1); 723 else 724 mvebu_gpio_blink(&mvchip->chip, pwm->hwpwm, 0); 725 726 spin_unlock_irqrestore(&mvpwm->lock, flags); 727 728 return 0; 729 } 730 731 static const struct pwm_ops mvebu_pwm_ops = { 732 .request = mvebu_pwm_request, 733 .free = mvebu_pwm_free, 734 .get_state = mvebu_pwm_get_state, 735 .apply = mvebu_pwm_apply, 736 .owner = THIS_MODULE, 737 }; 738 739 static void __maybe_unused mvebu_pwm_suspend(struct mvebu_gpio_chip *mvchip) 740 { 741 struct mvebu_pwm *mvpwm = mvchip->mvpwm; 742 743 regmap_read(mvchip->regs, GPIO_BLINK_CNT_SELECT_OFF + mvchip->offset, 744 &mvpwm->blink_select); 745 mvpwm->blink_on_duration = 746 readl_relaxed(mvebu_pwmreg_blink_on_duration(mvpwm)); 747 mvpwm->blink_off_duration = 748 readl_relaxed(mvebu_pwmreg_blink_off_duration(mvpwm)); 749 } 750 751 static void __maybe_unused mvebu_pwm_resume(struct mvebu_gpio_chip *mvchip) 752 { 753 struct mvebu_pwm *mvpwm = mvchip->mvpwm; 754 755 regmap_write(mvchip->regs, GPIO_BLINK_CNT_SELECT_OFF + mvchip->offset, 756 mvpwm->blink_select); 757 writel_relaxed(mvpwm->blink_on_duration, 758 mvebu_pwmreg_blink_on_duration(mvpwm)); 759 writel_relaxed(mvpwm->blink_off_duration, 760 mvebu_pwmreg_blink_off_duration(mvpwm)); 761 } 762 763 static int mvebu_pwm_probe(struct platform_device *pdev, 764 struct mvebu_gpio_chip *mvchip, 765 int id) 766 { 767 struct device *dev = &pdev->dev; 768 struct mvebu_pwm *mvpwm; 769 struct resource *res; 770 u32 set; 771 772 if (!of_device_is_compatible(mvchip->chip.of_node, 773 "marvell,armada-370-gpio")) 774 return 0; 775 776 /* 777 * There are only two sets of PWM configuration registers for 778 * all the GPIO lines on those SoCs which this driver reserves 779 * for the first two GPIO chips. So if the resource is missing 780 * we can't treat it as an error. 781 */ 782 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pwm"); 783 if (!res) 784 return 0; 785 786 if (IS_ERR(mvchip->clk)) 787 return PTR_ERR(mvchip->clk); 788 789 /* 790 * Use set A for lines of GPIO chip with id 0, B for GPIO chip 791 * with id 1. Don't allow further GPIO chips to be used for PWM. 792 */ 793 if (id == 0) 794 set = 0; 795 else if (id == 1) 796 set = U32_MAX; 797 else 798 return -EINVAL; 799 regmap_write(mvchip->regs, 800 GPIO_BLINK_CNT_SELECT_OFF + mvchip->offset, set); 801 802 mvpwm = devm_kzalloc(dev, sizeof(struct mvebu_pwm), GFP_KERNEL); 803 if (!mvpwm) 804 return -ENOMEM; 805 mvchip->mvpwm = mvpwm; 806 mvpwm->mvchip = mvchip; 807 808 mvpwm->membase = devm_ioremap_resource(dev, res); 809 if (IS_ERR(mvpwm->membase)) 810 return PTR_ERR(mvpwm->membase); 811 812 mvpwm->clk_rate = clk_get_rate(mvchip->clk); 813 if (!mvpwm->clk_rate) { 814 dev_err(dev, "failed to get clock rate\n"); 815 return -EINVAL; 816 } 817 818 mvpwm->chip.dev = dev; 819 mvpwm->chip.ops = &mvebu_pwm_ops; 820 mvpwm->chip.npwm = mvchip->chip.ngpio; 821 /* 822 * There may already be some PWM allocated, so we can't force 823 * mvpwm->chip.base to a fixed point like mvchip->chip.base. 824 * So, we let pwmchip_add() do the numbering and take the next free 825 * region. 826 */ 827 mvpwm->chip.base = -1; 828 829 spin_lock_init(&mvpwm->lock); 830 831 return pwmchip_add(&mvpwm->chip); 832 } 833 834 #ifdef CONFIG_DEBUG_FS 835 #include <linux/seq_file.h> 836 837 static void mvebu_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip) 838 { 839 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip); 840 u32 out, io_conf, blink, in_pol, data_in, cause, edg_msk, lvl_msk; 841 int i; 842 843 regmap_read(mvchip->regs, GPIO_OUT_OFF + mvchip->offset, &out); 844 regmap_read(mvchip->regs, GPIO_IO_CONF_OFF + mvchip->offset, &io_conf); 845 regmap_read(mvchip->regs, GPIO_BLINK_EN_OFF + mvchip->offset, &blink); 846 regmap_read(mvchip->regs, GPIO_IN_POL_OFF + mvchip->offset, &in_pol); 847 regmap_read(mvchip->regs, GPIO_DATA_IN_OFF + mvchip->offset, &data_in); 848 cause = mvebu_gpio_read_edge_cause(mvchip); 849 edg_msk = mvebu_gpio_read_edge_mask(mvchip); 850 lvl_msk = mvebu_gpio_read_level_mask(mvchip); 851 852 for (i = 0; i < chip->ngpio; i++) { 853 const char *label; 854 u32 msk; 855 bool is_out; 856 857 label = gpiochip_is_requested(chip, i); 858 if (!label) 859 continue; 860 861 msk = BIT(i); 862 is_out = !(io_conf & msk); 863 864 seq_printf(s, " gpio-%-3d (%-20.20s)", chip->base + i, label); 865 866 if (is_out) { 867 seq_printf(s, " out %s %s\n", 868 out & msk ? "hi" : "lo", 869 blink & msk ? "(blink )" : ""); 870 continue; 871 } 872 873 seq_printf(s, " in %s (act %s) - IRQ", 874 (data_in ^ in_pol) & msk ? "hi" : "lo", 875 in_pol & msk ? "lo" : "hi"); 876 if (!((edg_msk | lvl_msk) & msk)) { 877 seq_puts(s, " disabled\n"); 878 continue; 879 } 880 if (edg_msk & msk) 881 seq_puts(s, " edge "); 882 if (lvl_msk & msk) 883 seq_puts(s, " level"); 884 seq_printf(s, " (%s)\n", cause & msk ? "pending" : "clear "); 885 } 886 } 887 #else 888 #define mvebu_gpio_dbg_show NULL 889 #endif 890 891 static const struct of_device_id mvebu_gpio_of_match[] = { 892 { 893 .compatible = "marvell,orion-gpio", 894 .data = (void *) MVEBU_GPIO_SOC_VARIANT_ORION, 895 }, 896 { 897 .compatible = "marvell,mv78200-gpio", 898 .data = (void *) MVEBU_GPIO_SOC_VARIANT_MV78200, 899 }, 900 { 901 .compatible = "marvell,armadaxp-gpio", 902 .data = (void *) MVEBU_GPIO_SOC_VARIANT_ARMADAXP, 903 }, 904 { 905 .compatible = "marvell,armada-370-gpio", 906 .data = (void *) MVEBU_GPIO_SOC_VARIANT_ORION, 907 }, 908 { 909 .compatible = "marvell,armada-8k-gpio", 910 .data = (void *) MVEBU_GPIO_SOC_VARIANT_A8K, 911 }, 912 { 913 /* sentinel */ 914 }, 915 }; 916 917 static int mvebu_gpio_suspend(struct platform_device *pdev, pm_message_t state) 918 { 919 struct mvebu_gpio_chip *mvchip = platform_get_drvdata(pdev); 920 int i; 921 922 regmap_read(mvchip->regs, GPIO_OUT_OFF + mvchip->offset, 923 &mvchip->out_reg); 924 regmap_read(mvchip->regs, GPIO_IO_CONF_OFF + mvchip->offset, 925 &mvchip->io_conf_reg); 926 regmap_read(mvchip->regs, GPIO_BLINK_EN_OFF + mvchip->offset, 927 &mvchip->blink_en_reg); 928 regmap_read(mvchip->regs, GPIO_IN_POL_OFF + mvchip->offset, 929 &mvchip->in_pol_reg); 930 931 switch (mvchip->soc_variant) { 932 case MVEBU_GPIO_SOC_VARIANT_ORION: 933 case MVEBU_GPIO_SOC_VARIANT_A8K: 934 regmap_read(mvchip->regs, GPIO_EDGE_MASK_OFF + mvchip->offset, 935 &mvchip->edge_mask_regs[0]); 936 regmap_read(mvchip->regs, GPIO_LEVEL_MASK_OFF + mvchip->offset, 937 &mvchip->level_mask_regs[0]); 938 break; 939 case MVEBU_GPIO_SOC_VARIANT_MV78200: 940 for (i = 0; i < 2; i++) { 941 regmap_read(mvchip->regs, 942 GPIO_EDGE_MASK_MV78200_OFF(i), 943 &mvchip->edge_mask_regs[i]); 944 regmap_read(mvchip->regs, 945 GPIO_LEVEL_MASK_MV78200_OFF(i), 946 &mvchip->level_mask_regs[i]); 947 } 948 break; 949 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP: 950 for (i = 0; i < 4; i++) { 951 regmap_read(mvchip->regs, 952 GPIO_EDGE_MASK_ARMADAXP_OFF(i), 953 &mvchip->edge_mask_regs[i]); 954 regmap_read(mvchip->regs, 955 GPIO_LEVEL_MASK_ARMADAXP_OFF(i), 956 &mvchip->level_mask_regs[i]); 957 } 958 break; 959 default: 960 BUG(); 961 } 962 963 if (IS_ENABLED(CONFIG_PWM)) 964 mvebu_pwm_suspend(mvchip); 965 966 return 0; 967 } 968 969 static int mvebu_gpio_resume(struct platform_device *pdev) 970 { 971 struct mvebu_gpio_chip *mvchip = platform_get_drvdata(pdev); 972 int i; 973 974 regmap_write(mvchip->regs, GPIO_OUT_OFF + mvchip->offset, 975 mvchip->out_reg); 976 regmap_write(mvchip->regs, GPIO_IO_CONF_OFF + mvchip->offset, 977 mvchip->io_conf_reg); 978 regmap_write(mvchip->regs, GPIO_BLINK_EN_OFF + mvchip->offset, 979 mvchip->blink_en_reg); 980 regmap_write(mvchip->regs, GPIO_IN_POL_OFF + mvchip->offset, 981 mvchip->in_pol_reg); 982 983 switch (mvchip->soc_variant) { 984 case MVEBU_GPIO_SOC_VARIANT_ORION: 985 case MVEBU_GPIO_SOC_VARIANT_A8K: 986 regmap_write(mvchip->regs, GPIO_EDGE_MASK_OFF + mvchip->offset, 987 mvchip->edge_mask_regs[0]); 988 regmap_write(mvchip->regs, GPIO_LEVEL_MASK_OFF + mvchip->offset, 989 mvchip->level_mask_regs[0]); 990 break; 991 case MVEBU_GPIO_SOC_VARIANT_MV78200: 992 for (i = 0; i < 2; i++) { 993 regmap_write(mvchip->regs, 994 GPIO_EDGE_MASK_MV78200_OFF(i), 995 mvchip->edge_mask_regs[i]); 996 regmap_write(mvchip->regs, 997 GPIO_LEVEL_MASK_MV78200_OFF(i), 998 mvchip->level_mask_regs[i]); 999 } 1000 break; 1001 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP: 1002 for (i = 0; i < 4; i++) { 1003 regmap_write(mvchip->regs, 1004 GPIO_EDGE_MASK_ARMADAXP_OFF(i), 1005 mvchip->edge_mask_regs[i]); 1006 regmap_write(mvchip->regs, 1007 GPIO_LEVEL_MASK_ARMADAXP_OFF(i), 1008 mvchip->level_mask_regs[i]); 1009 } 1010 break; 1011 default: 1012 BUG(); 1013 } 1014 1015 if (IS_ENABLED(CONFIG_PWM)) 1016 mvebu_pwm_resume(mvchip); 1017 1018 return 0; 1019 } 1020 1021 static const struct regmap_config mvebu_gpio_regmap_config = { 1022 .reg_bits = 32, 1023 .reg_stride = 4, 1024 .val_bits = 32, 1025 .fast_io = true, 1026 }; 1027 1028 static int mvebu_gpio_probe_raw(struct platform_device *pdev, 1029 struct mvebu_gpio_chip *mvchip) 1030 { 1031 struct resource *res; 1032 void __iomem *base; 1033 1034 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1035 base = devm_ioremap_resource(&pdev->dev, res); 1036 if (IS_ERR(base)) 1037 return PTR_ERR(base); 1038 1039 mvchip->regs = devm_regmap_init_mmio(&pdev->dev, base, 1040 &mvebu_gpio_regmap_config); 1041 if (IS_ERR(mvchip->regs)) 1042 return PTR_ERR(mvchip->regs); 1043 1044 /* 1045 * For the legacy SoCs, the regmap directly maps to the GPIO 1046 * registers, so no offset is needed. 1047 */ 1048 mvchip->offset = 0; 1049 1050 /* 1051 * The Armada XP has a second range of registers for the 1052 * per-CPU registers 1053 */ 1054 if (mvchip->soc_variant == MVEBU_GPIO_SOC_VARIANT_ARMADAXP) { 1055 res = platform_get_resource(pdev, IORESOURCE_MEM, 1); 1056 base = devm_ioremap_resource(&pdev->dev, res); 1057 if (IS_ERR(base)) 1058 return PTR_ERR(base); 1059 1060 mvchip->percpu_regs = 1061 devm_regmap_init_mmio(&pdev->dev, base, 1062 &mvebu_gpio_regmap_config); 1063 if (IS_ERR(mvchip->percpu_regs)) 1064 return PTR_ERR(mvchip->percpu_regs); 1065 } 1066 1067 return 0; 1068 } 1069 1070 static int mvebu_gpio_probe_syscon(struct platform_device *pdev, 1071 struct mvebu_gpio_chip *mvchip) 1072 { 1073 mvchip->regs = syscon_node_to_regmap(pdev->dev.parent->of_node); 1074 if (IS_ERR(mvchip->regs)) 1075 return PTR_ERR(mvchip->regs); 1076 1077 if (of_property_read_u32(pdev->dev.of_node, "offset", &mvchip->offset)) 1078 return -EINVAL; 1079 1080 return 0; 1081 } 1082 1083 static int mvebu_gpio_probe(struct platform_device *pdev) 1084 { 1085 struct mvebu_gpio_chip *mvchip; 1086 const struct of_device_id *match; 1087 struct device_node *np = pdev->dev.of_node; 1088 struct irq_chip_generic *gc; 1089 struct irq_chip_type *ct; 1090 unsigned int ngpios; 1091 bool have_irqs; 1092 int soc_variant; 1093 int i, cpu, id; 1094 int err; 1095 1096 match = of_match_device(mvebu_gpio_of_match, &pdev->dev); 1097 if (match) 1098 soc_variant = (unsigned long) match->data; 1099 else 1100 soc_variant = MVEBU_GPIO_SOC_VARIANT_ORION; 1101 1102 /* Some gpio controllers do not provide irq support */ 1103 have_irqs = of_irq_count(np) != 0; 1104 1105 mvchip = devm_kzalloc(&pdev->dev, sizeof(struct mvebu_gpio_chip), 1106 GFP_KERNEL); 1107 if (!mvchip) 1108 return -ENOMEM; 1109 1110 platform_set_drvdata(pdev, mvchip); 1111 1112 if (of_property_read_u32(pdev->dev.of_node, "ngpios", &ngpios)) { 1113 dev_err(&pdev->dev, "Missing ngpios OF property\n"); 1114 return -ENODEV; 1115 } 1116 1117 id = of_alias_get_id(pdev->dev.of_node, "gpio"); 1118 if (id < 0) { 1119 dev_err(&pdev->dev, "Couldn't get OF id\n"); 1120 return id; 1121 } 1122 1123 mvchip->clk = devm_clk_get(&pdev->dev, NULL); 1124 /* Not all SoCs require a clock.*/ 1125 if (!IS_ERR(mvchip->clk)) 1126 clk_prepare_enable(mvchip->clk); 1127 1128 mvchip->soc_variant = soc_variant; 1129 mvchip->chip.label = dev_name(&pdev->dev); 1130 mvchip->chip.parent = &pdev->dev; 1131 mvchip->chip.request = gpiochip_generic_request; 1132 mvchip->chip.free = gpiochip_generic_free; 1133 mvchip->chip.direction_input = mvebu_gpio_direction_input; 1134 mvchip->chip.get = mvebu_gpio_get; 1135 mvchip->chip.direction_output = mvebu_gpio_direction_output; 1136 mvchip->chip.set = mvebu_gpio_set; 1137 if (have_irqs) 1138 mvchip->chip.to_irq = mvebu_gpio_to_irq; 1139 mvchip->chip.base = id * MVEBU_MAX_GPIO_PER_BANK; 1140 mvchip->chip.ngpio = ngpios; 1141 mvchip->chip.can_sleep = false; 1142 mvchip->chip.of_node = np; 1143 mvchip->chip.dbg_show = mvebu_gpio_dbg_show; 1144 1145 if (soc_variant == MVEBU_GPIO_SOC_VARIANT_A8K) 1146 err = mvebu_gpio_probe_syscon(pdev, mvchip); 1147 else 1148 err = mvebu_gpio_probe_raw(pdev, mvchip); 1149 1150 if (err) 1151 return err; 1152 1153 /* 1154 * Mask and clear GPIO interrupts. 1155 */ 1156 switch (soc_variant) { 1157 case MVEBU_GPIO_SOC_VARIANT_ORION: 1158 case MVEBU_GPIO_SOC_VARIANT_A8K: 1159 regmap_write(mvchip->regs, 1160 GPIO_EDGE_CAUSE_OFF + mvchip->offset, 0); 1161 regmap_write(mvchip->regs, 1162 GPIO_EDGE_MASK_OFF + mvchip->offset, 0); 1163 regmap_write(mvchip->regs, 1164 GPIO_LEVEL_MASK_OFF + mvchip->offset, 0); 1165 break; 1166 case MVEBU_GPIO_SOC_VARIANT_MV78200: 1167 regmap_write(mvchip->regs, GPIO_EDGE_CAUSE_OFF, 0); 1168 for (cpu = 0; cpu < 2; cpu++) { 1169 regmap_write(mvchip->regs, 1170 GPIO_EDGE_MASK_MV78200_OFF(cpu), 0); 1171 regmap_write(mvchip->regs, 1172 GPIO_LEVEL_MASK_MV78200_OFF(cpu), 0); 1173 } 1174 break; 1175 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP: 1176 regmap_write(mvchip->regs, GPIO_EDGE_CAUSE_OFF, 0); 1177 regmap_write(mvchip->regs, GPIO_EDGE_MASK_OFF, 0); 1178 regmap_write(mvchip->regs, GPIO_LEVEL_MASK_OFF, 0); 1179 for (cpu = 0; cpu < 4; cpu++) { 1180 regmap_write(mvchip->percpu_regs, 1181 GPIO_EDGE_CAUSE_ARMADAXP_OFF(cpu), 0); 1182 regmap_write(mvchip->percpu_regs, 1183 GPIO_EDGE_MASK_ARMADAXP_OFF(cpu), 0); 1184 regmap_write(mvchip->percpu_regs, 1185 GPIO_LEVEL_MASK_ARMADAXP_OFF(cpu), 0); 1186 } 1187 break; 1188 default: 1189 BUG(); 1190 } 1191 1192 devm_gpiochip_add_data(&pdev->dev, &mvchip->chip, mvchip); 1193 1194 /* Some gpio controllers do not provide irq support */ 1195 if (!have_irqs) 1196 return 0; 1197 1198 mvchip->domain = 1199 irq_domain_add_linear(np, ngpios, &irq_generic_chip_ops, NULL); 1200 if (!mvchip->domain) { 1201 dev_err(&pdev->dev, "couldn't allocate irq domain %s (DT).\n", 1202 mvchip->chip.label); 1203 return -ENODEV; 1204 } 1205 1206 err = irq_alloc_domain_generic_chips( 1207 mvchip->domain, ngpios, 2, np->name, handle_level_irq, 1208 IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_LEVEL, 0, 0); 1209 if (err) { 1210 dev_err(&pdev->dev, "couldn't allocate irq chips %s (DT).\n", 1211 mvchip->chip.label); 1212 goto err_domain; 1213 } 1214 1215 /* 1216 * NOTE: The common accessors cannot be used because of the percpu 1217 * access to the mask registers 1218 */ 1219 gc = irq_get_domain_generic_chip(mvchip->domain, 0); 1220 gc->private = mvchip; 1221 ct = &gc->chip_types[0]; 1222 ct->type = IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW; 1223 ct->chip.irq_mask = mvebu_gpio_level_irq_mask; 1224 ct->chip.irq_unmask = mvebu_gpio_level_irq_unmask; 1225 ct->chip.irq_set_type = mvebu_gpio_irq_set_type; 1226 ct->chip.name = mvchip->chip.label; 1227 1228 ct = &gc->chip_types[1]; 1229 ct->type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING; 1230 ct->chip.irq_ack = mvebu_gpio_irq_ack; 1231 ct->chip.irq_mask = mvebu_gpio_edge_irq_mask; 1232 ct->chip.irq_unmask = mvebu_gpio_edge_irq_unmask; 1233 ct->chip.irq_set_type = mvebu_gpio_irq_set_type; 1234 ct->handler = handle_edge_irq; 1235 ct->chip.name = mvchip->chip.label; 1236 1237 /* 1238 * Setup the interrupt handlers. Each chip can have up to 4 1239 * interrupt handlers, with each handler dealing with 8 GPIO 1240 * pins. 1241 */ 1242 for (i = 0; i < 4; i++) { 1243 int irq = platform_get_irq(pdev, i); 1244 1245 if (irq < 0) 1246 continue; 1247 irq_set_chained_handler_and_data(irq, mvebu_gpio_irq_handler, 1248 mvchip); 1249 } 1250 1251 /* Some MVEBU SoCs have simple PWM support for GPIO lines */ 1252 if (IS_ENABLED(CONFIG_PWM)) 1253 return mvebu_pwm_probe(pdev, mvchip, id); 1254 1255 return 0; 1256 1257 err_domain: 1258 irq_domain_remove(mvchip->domain); 1259 1260 return err; 1261 } 1262 1263 static struct platform_driver mvebu_gpio_driver = { 1264 .driver = { 1265 .name = "mvebu-gpio", 1266 .of_match_table = mvebu_gpio_of_match, 1267 }, 1268 .probe = mvebu_gpio_probe, 1269 .suspend = mvebu_gpio_suspend, 1270 .resume = mvebu_gpio_resume, 1271 }; 1272 builtin_platform_driver(mvebu_gpio_driver); 1273