1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * GPIO driver for Marvell SoCs 4 * 5 * Copyright (C) 2012 Marvell 6 * 7 * Thomas Petazzoni <thomas.petazzoni@free-electrons.com> 8 * Andrew Lunn <andrew@lunn.ch> 9 * Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> 10 * 11 * This driver is a fairly straightforward GPIO driver for the 12 * complete family of Marvell EBU SoC platforms (Orion, Dove, 13 * Kirkwood, Discovery, Armada 370/XP). The only complexity of this 14 * driver is the different register layout that exists between the 15 * non-SMP platforms (Orion, Dove, Kirkwood, Armada 370) and the SMP 16 * platforms (MV78200 from the Discovery family and the Armada 17 * XP). Therefore, this driver handles three variants of the GPIO 18 * block: 19 * - the basic variant, called "orion-gpio", with the simplest 20 * register set. Used on Orion, Dove, Kirkwoord, Armada 370 and 21 * non-SMP Discovery systems 22 * - the mv78200 variant for MV78200 Discovery systems. This variant 23 * turns the edge mask and level mask registers into CPU0 edge 24 * mask/level mask registers, and adds CPU1 edge mask/level mask 25 * registers. 26 * - the armadaxp variant for Armada XP systems. This variant keeps 27 * the normal cause/edge mask/level mask registers when the global 28 * interrupts are used, but adds per-CPU cause/edge mask/level mask 29 * registers n a separate memory area for the per-CPU GPIO 30 * interrupts. 31 */ 32 33 #include <linux/bitops.h> 34 #include <linux/clk.h> 35 #include <linux/err.h> 36 #include <linux/gpio/driver.h> 37 #include <linux/gpio/consumer.h> 38 #include <linux/gpio/machine.h> 39 #include <linux/init.h> 40 #include <linux/io.h> 41 #include <linux/irq.h> 42 #include <linux/irqchip/chained_irq.h> 43 #include <linux/irqdomain.h> 44 #include <linux/mfd/syscon.h> 45 #include <linux/of_device.h> 46 #include <linux/pinctrl/consumer.h> 47 #include <linux/platform_device.h> 48 #include <linux/pwm.h> 49 #include <linux/regmap.h> 50 #include <linux/slab.h> 51 52 /* 53 * GPIO unit register offsets. 54 */ 55 #define GPIO_OUT_OFF 0x0000 56 #define GPIO_IO_CONF_OFF 0x0004 57 #define GPIO_BLINK_EN_OFF 0x0008 58 #define GPIO_IN_POL_OFF 0x000c 59 #define GPIO_DATA_IN_OFF 0x0010 60 #define GPIO_EDGE_CAUSE_OFF 0x0014 61 #define GPIO_EDGE_MASK_OFF 0x0018 62 #define GPIO_LEVEL_MASK_OFF 0x001c 63 #define GPIO_BLINK_CNT_SELECT_OFF 0x0020 64 65 /* 66 * PWM register offsets. 67 */ 68 #define PWM_BLINK_ON_DURATION_OFF 0x0 69 #define PWM_BLINK_OFF_DURATION_OFF 0x4 70 #define PWM_BLINK_COUNTER_B_OFF 0x8 71 72 /* Armada 8k variant gpios register offsets */ 73 #define AP80X_GPIO0_OFF_A8K 0x1040 74 #define CP11X_GPIO0_OFF_A8K 0x100 75 #define CP11X_GPIO1_OFF_A8K 0x140 76 77 /* The MV78200 has per-CPU registers for edge mask and level mask */ 78 #define GPIO_EDGE_MASK_MV78200_OFF(cpu) ((cpu) ? 0x30 : 0x18) 79 #define GPIO_LEVEL_MASK_MV78200_OFF(cpu) ((cpu) ? 0x34 : 0x1C) 80 81 /* 82 * The Armada XP has per-CPU registers for interrupt cause, interrupt 83 * mask and interrupt level mask. Those are in percpu_regs range. 84 */ 85 #define GPIO_EDGE_CAUSE_ARMADAXP_OFF(cpu) ((cpu) * 0x4) 86 #define GPIO_EDGE_MASK_ARMADAXP_OFF(cpu) (0x10 + (cpu) * 0x4) 87 #define GPIO_LEVEL_MASK_ARMADAXP_OFF(cpu) (0x20 + (cpu) * 0x4) 88 89 #define MVEBU_GPIO_SOC_VARIANT_ORION 0x1 90 #define MVEBU_GPIO_SOC_VARIANT_MV78200 0x2 91 #define MVEBU_GPIO_SOC_VARIANT_ARMADAXP 0x3 92 #define MVEBU_GPIO_SOC_VARIANT_A8K 0x4 93 94 #define MVEBU_MAX_GPIO_PER_BANK 32 95 96 struct mvebu_pwm { 97 struct regmap *regs; 98 u32 offset; 99 unsigned long clk_rate; 100 struct gpio_desc *gpiod; 101 struct pwm_chip chip; 102 spinlock_t lock; 103 struct mvebu_gpio_chip *mvchip; 104 105 /* Used to preserve GPIO/PWM registers across suspend/resume */ 106 u32 blink_select; 107 u32 blink_on_duration; 108 u32 blink_off_duration; 109 }; 110 111 struct mvebu_gpio_chip { 112 struct gpio_chip chip; 113 struct regmap *regs; 114 u32 offset; 115 struct regmap *percpu_regs; 116 int irqbase; 117 struct irq_domain *domain; 118 int soc_variant; 119 120 /* Used for PWM support */ 121 struct clk *clk; 122 struct mvebu_pwm *mvpwm; 123 124 /* Used to preserve GPIO registers across suspend/resume */ 125 u32 out_reg; 126 u32 io_conf_reg; 127 u32 blink_en_reg; 128 u32 in_pol_reg; 129 u32 edge_mask_regs[4]; 130 u32 level_mask_regs[4]; 131 }; 132 133 /* 134 * Functions returning addresses of individual registers for a given 135 * GPIO controller. 136 */ 137 138 static void mvebu_gpioreg_edge_cause(struct mvebu_gpio_chip *mvchip, 139 struct regmap **map, unsigned int *offset) 140 { 141 int cpu; 142 143 switch (mvchip->soc_variant) { 144 case MVEBU_GPIO_SOC_VARIANT_ORION: 145 case MVEBU_GPIO_SOC_VARIANT_MV78200: 146 case MVEBU_GPIO_SOC_VARIANT_A8K: 147 *map = mvchip->regs; 148 *offset = GPIO_EDGE_CAUSE_OFF + mvchip->offset; 149 break; 150 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP: 151 cpu = smp_processor_id(); 152 *map = mvchip->percpu_regs; 153 *offset = GPIO_EDGE_CAUSE_ARMADAXP_OFF(cpu); 154 break; 155 default: 156 BUG(); 157 } 158 } 159 160 static u32 161 mvebu_gpio_read_edge_cause(struct mvebu_gpio_chip *mvchip) 162 { 163 struct regmap *map; 164 unsigned int offset; 165 u32 val; 166 167 mvebu_gpioreg_edge_cause(mvchip, &map, &offset); 168 regmap_read(map, offset, &val); 169 170 return val; 171 } 172 173 static void 174 mvebu_gpio_write_edge_cause(struct mvebu_gpio_chip *mvchip, u32 val) 175 { 176 struct regmap *map; 177 unsigned int offset; 178 179 mvebu_gpioreg_edge_cause(mvchip, &map, &offset); 180 regmap_write(map, offset, val); 181 } 182 183 static inline void 184 mvebu_gpioreg_edge_mask(struct mvebu_gpio_chip *mvchip, 185 struct regmap **map, unsigned int *offset) 186 { 187 int cpu; 188 189 switch (mvchip->soc_variant) { 190 case MVEBU_GPIO_SOC_VARIANT_ORION: 191 case MVEBU_GPIO_SOC_VARIANT_A8K: 192 *map = mvchip->regs; 193 *offset = GPIO_EDGE_MASK_OFF + mvchip->offset; 194 break; 195 case MVEBU_GPIO_SOC_VARIANT_MV78200: 196 cpu = smp_processor_id(); 197 *map = mvchip->regs; 198 *offset = GPIO_EDGE_MASK_MV78200_OFF(cpu); 199 break; 200 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP: 201 cpu = smp_processor_id(); 202 *map = mvchip->percpu_regs; 203 *offset = GPIO_EDGE_MASK_ARMADAXP_OFF(cpu); 204 break; 205 default: 206 BUG(); 207 } 208 } 209 210 static u32 211 mvebu_gpio_read_edge_mask(struct mvebu_gpio_chip *mvchip) 212 { 213 struct regmap *map; 214 unsigned int offset; 215 u32 val; 216 217 mvebu_gpioreg_edge_mask(mvchip, &map, &offset); 218 regmap_read(map, offset, &val); 219 220 return val; 221 } 222 223 static void 224 mvebu_gpio_write_edge_mask(struct mvebu_gpio_chip *mvchip, u32 val) 225 { 226 struct regmap *map; 227 unsigned int offset; 228 229 mvebu_gpioreg_edge_mask(mvchip, &map, &offset); 230 regmap_write(map, offset, val); 231 } 232 233 static void 234 mvebu_gpioreg_level_mask(struct mvebu_gpio_chip *mvchip, 235 struct regmap **map, unsigned int *offset) 236 { 237 int cpu; 238 239 switch (mvchip->soc_variant) { 240 case MVEBU_GPIO_SOC_VARIANT_ORION: 241 case MVEBU_GPIO_SOC_VARIANT_A8K: 242 *map = mvchip->regs; 243 *offset = GPIO_LEVEL_MASK_OFF + mvchip->offset; 244 break; 245 case MVEBU_GPIO_SOC_VARIANT_MV78200: 246 cpu = smp_processor_id(); 247 *map = mvchip->regs; 248 *offset = GPIO_LEVEL_MASK_MV78200_OFF(cpu); 249 break; 250 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP: 251 cpu = smp_processor_id(); 252 *map = mvchip->percpu_regs; 253 *offset = GPIO_LEVEL_MASK_ARMADAXP_OFF(cpu); 254 break; 255 default: 256 BUG(); 257 } 258 } 259 260 static u32 261 mvebu_gpio_read_level_mask(struct mvebu_gpio_chip *mvchip) 262 { 263 struct regmap *map; 264 unsigned int offset; 265 u32 val; 266 267 mvebu_gpioreg_level_mask(mvchip, &map, &offset); 268 regmap_read(map, offset, &val); 269 270 return val; 271 } 272 273 static void 274 mvebu_gpio_write_level_mask(struct mvebu_gpio_chip *mvchip, u32 val) 275 { 276 struct regmap *map; 277 unsigned int offset; 278 279 mvebu_gpioreg_level_mask(mvchip, &map, &offset); 280 regmap_write(map, offset, val); 281 } 282 283 /* 284 * Functions returning offsets of individual registers for a given 285 * PWM controller. 286 */ 287 static unsigned int mvebu_pwmreg_blink_on_duration(struct mvebu_pwm *mvpwm) 288 { 289 return mvpwm->offset + PWM_BLINK_ON_DURATION_OFF; 290 } 291 292 static unsigned int mvebu_pwmreg_blink_off_duration(struct mvebu_pwm *mvpwm) 293 { 294 return mvpwm->offset + PWM_BLINK_OFF_DURATION_OFF; 295 } 296 297 /* 298 * Functions implementing the gpio_chip methods 299 */ 300 static void mvebu_gpio_set(struct gpio_chip *chip, unsigned int pin, int value) 301 { 302 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip); 303 304 regmap_update_bits(mvchip->regs, GPIO_OUT_OFF + mvchip->offset, 305 BIT(pin), value ? BIT(pin) : 0); 306 } 307 308 static int mvebu_gpio_get(struct gpio_chip *chip, unsigned int pin) 309 { 310 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip); 311 u32 u; 312 313 regmap_read(mvchip->regs, GPIO_IO_CONF_OFF + mvchip->offset, &u); 314 315 if (u & BIT(pin)) { 316 u32 data_in, in_pol; 317 318 regmap_read(mvchip->regs, GPIO_DATA_IN_OFF + mvchip->offset, 319 &data_in); 320 regmap_read(mvchip->regs, GPIO_IN_POL_OFF + mvchip->offset, 321 &in_pol); 322 u = data_in ^ in_pol; 323 } else { 324 regmap_read(mvchip->regs, GPIO_OUT_OFF + mvchip->offset, &u); 325 } 326 327 return (u >> pin) & 1; 328 } 329 330 static void mvebu_gpio_blink(struct gpio_chip *chip, unsigned int pin, 331 int value) 332 { 333 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip); 334 335 regmap_update_bits(mvchip->regs, GPIO_BLINK_EN_OFF + mvchip->offset, 336 BIT(pin), value ? BIT(pin) : 0); 337 } 338 339 static int mvebu_gpio_direction_input(struct gpio_chip *chip, unsigned int pin) 340 { 341 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip); 342 int ret; 343 344 /* 345 * Check with the pinctrl driver whether this pin is usable as 346 * an input GPIO 347 */ 348 ret = pinctrl_gpio_direction_input(chip->base + pin); 349 if (ret) 350 return ret; 351 352 regmap_update_bits(mvchip->regs, GPIO_IO_CONF_OFF + mvchip->offset, 353 BIT(pin), BIT(pin)); 354 355 return 0; 356 } 357 358 static int mvebu_gpio_direction_output(struct gpio_chip *chip, unsigned int pin, 359 int value) 360 { 361 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip); 362 int ret; 363 364 /* 365 * Check with the pinctrl driver whether this pin is usable as 366 * an output GPIO 367 */ 368 ret = pinctrl_gpio_direction_output(chip->base + pin); 369 if (ret) 370 return ret; 371 372 mvebu_gpio_blink(chip, pin, 0); 373 mvebu_gpio_set(chip, pin, value); 374 375 regmap_update_bits(mvchip->regs, GPIO_IO_CONF_OFF + mvchip->offset, 376 BIT(pin), 0); 377 378 return 0; 379 } 380 381 static int mvebu_gpio_get_direction(struct gpio_chip *chip, unsigned int pin) 382 { 383 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip); 384 u32 u; 385 386 regmap_read(mvchip->regs, GPIO_IO_CONF_OFF + mvchip->offset, &u); 387 388 if (u & BIT(pin)) 389 return GPIO_LINE_DIRECTION_IN; 390 391 return GPIO_LINE_DIRECTION_OUT; 392 } 393 394 static int mvebu_gpio_to_irq(struct gpio_chip *chip, unsigned int pin) 395 { 396 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip); 397 398 return irq_create_mapping(mvchip->domain, pin); 399 } 400 401 /* 402 * Functions implementing the irq_chip methods 403 */ 404 static void mvebu_gpio_irq_ack(struct irq_data *d) 405 { 406 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); 407 struct mvebu_gpio_chip *mvchip = gc->private; 408 u32 mask = d->mask; 409 410 irq_gc_lock(gc); 411 mvebu_gpio_write_edge_cause(mvchip, ~mask); 412 irq_gc_unlock(gc); 413 } 414 415 static void mvebu_gpio_edge_irq_mask(struct irq_data *d) 416 { 417 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); 418 struct mvebu_gpio_chip *mvchip = gc->private; 419 struct irq_chip_type *ct = irq_data_get_chip_type(d); 420 u32 mask = d->mask; 421 422 irq_gc_lock(gc); 423 ct->mask_cache_priv &= ~mask; 424 mvebu_gpio_write_edge_mask(mvchip, ct->mask_cache_priv); 425 irq_gc_unlock(gc); 426 } 427 428 static void mvebu_gpio_edge_irq_unmask(struct irq_data *d) 429 { 430 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); 431 struct mvebu_gpio_chip *mvchip = gc->private; 432 struct irq_chip_type *ct = irq_data_get_chip_type(d); 433 u32 mask = d->mask; 434 435 irq_gc_lock(gc); 436 mvebu_gpio_write_edge_cause(mvchip, ~mask); 437 ct->mask_cache_priv |= mask; 438 mvebu_gpio_write_edge_mask(mvchip, ct->mask_cache_priv); 439 irq_gc_unlock(gc); 440 } 441 442 static void mvebu_gpio_level_irq_mask(struct irq_data *d) 443 { 444 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); 445 struct mvebu_gpio_chip *mvchip = gc->private; 446 struct irq_chip_type *ct = irq_data_get_chip_type(d); 447 u32 mask = d->mask; 448 449 irq_gc_lock(gc); 450 ct->mask_cache_priv &= ~mask; 451 mvebu_gpio_write_level_mask(mvchip, ct->mask_cache_priv); 452 irq_gc_unlock(gc); 453 } 454 455 static void mvebu_gpio_level_irq_unmask(struct irq_data *d) 456 { 457 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); 458 struct mvebu_gpio_chip *mvchip = gc->private; 459 struct irq_chip_type *ct = irq_data_get_chip_type(d); 460 u32 mask = d->mask; 461 462 irq_gc_lock(gc); 463 ct->mask_cache_priv |= mask; 464 mvebu_gpio_write_level_mask(mvchip, ct->mask_cache_priv); 465 irq_gc_unlock(gc); 466 } 467 468 /***************************************************************************** 469 * MVEBU GPIO IRQ 470 * 471 * GPIO_IN_POL register controls whether GPIO_DATA_IN will hold the same 472 * value of the line or the opposite value. 473 * 474 * Level IRQ handlers: DATA_IN is used directly as cause register. 475 * Interrupt are masked by LEVEL_MASK registers. 476 * Edge IRQ handlers: Change in DATA_IN are latched in EDGE_CAUSE. 477 * Interrupt are masked by EDGE_MASK registers. 478 * Both-edge handlers: Similar to regular Edge handlers, but also swaps 479 * the polarity to catch the next line transaction. 480 * This is a race condition that might not perfectly 481 * work on some use cases. 482 * 483 * Every eight GPIO lines are grouped (OR'ed) before going up to main 484 * cause register. 485 * 486 * EDGE cause mask 487 * data-in /--------| |-----| |----\ 488 * -----| |----- ---- to main cause reg 489 * X \----------------| |----/ 490 * polarity LEVEL mask 491 * 492 ****************************************************************************/ 493 494 static int mvebu_gpio_irq_set_type(struct irq_data *d, unsigned int type) 495 { 496 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); 497 struct irq_chip_type *ct = irq_data_get_chip_type(d); 498 struct mvebu_gpio_chip *mvchip = gc->private; 499 int pin; 500 u32 u; 501 502 pin = d->hwirq; 503 504 regmap_read(mvchip->regs, GPIO_IO_CONF_OFF + mvchip->offset, &u); 505 if ((u & BIT(pin)) == 0) 506 return -EINVAL; 507 508 type &= IRQ_TYPE_SENSE_MASK; 509 if (type == IRQ_TYPE_NONE) 510 return -EINVAL; 511 512 /* Check if we need to change chip and handler */ 513 if (!(ct->type & type)) 514 if (irq_setup_alt_chip(d, type)) 515 return -EINVAL; 516 517 /* 518 * Configure interrupt polarity. 519 */ 520 switch (type) { 521 case IRQ_TYPE_EDGE_RISING: 522 case IRQ_TYPE_LEVEL_HIGH: 523 regmap_update_bits(mvchip->regs, 524 GPIO_IN_POL_OFF + mvchip->offset, 525 BIT(pin), 0); 526 break; 527 case IRQ_TYPE_EDGE_FALLING: 528 case IRQ_TYPE_LEVEL_LOW: 529 regmap_update_bits(mvchip->regs, 530 GPIO_IN_POL_OFF + mvchip->offset, 531 BIT(pin), BIT(pin)); 532 break; 533 case IRQ_TYPE_EDGE_BOTH: { 534 u32 data_in, in_pol, val; 535 536 regmap_read(mvchip->regs, 537 GPIO_IN_POL_OFF + mvchip->offset, &in_pol); 538 regmap_read(mvchip->regs, 539 GPIO_DATA_IN_OFF + mvchip->offset, &data_in); 540 541 /* 542 * set initial polarity based on current input level 543 */ 544 if ((data_in ^ in_pol) & BIT(pin)) 545 val = BIT(pin); /* falling */ 546 else 547 val = 0; /* raising */ 548 549 regmap_update_bits(mvchip->regs, 550 GPIO_IN_POL_OFF + mvchip->offset, 551 BIT(pin), val); 552 break; 553 } 554 } 555 return 0; 556 } 557 558 static void mvebu_gpio_irq_handler(struct irq_desc *desc) 559 { 560 struct mvebu_gpio_chip *mvchip = irq_desc_get_handler_data(desc); 561 struct irq_chip *chip = irq_desc_get_chip(desc); 562 u32 cause, type, data_in, level_mask, edge_cause, edge_mask; 563 int i; 564 565 if (mvchip == NULL) 566 return; 567 568 chained_irq_enter(chip, desc); 569 570 regmap_read(mvchip->regs, GPIO_DATA_IN_OFF + mvchip->offset, &data_in); 571 level_mask = mvebu_gpio_read_level_mask(mvchip); 572 edge_cause = mvebu_gpio_read_edge_cause(mvchip); 573 edge_mask = mvebu_gpio_read_edge_mask(mvchip); 574 575 cause = (data_in & level_mask) | (edge_cause & edge_mask); 576 577 for (i = 0; i < mvchip->chip.ngpio; i++) { 578 int irq; 579 580 irq = irq_find_mapping(mvchip->domain, i); 581 582 if (!(cause & BIT(i))) 583 continue; 584 585 type = irq_get_trigger_type(irq); 586 if ((type & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH) { 587 /* Swap polarity (race with GPIO line) */ 588 u32 polarity; 589 590 regmap_read(mvchip->regs, 591 GPIO_IN_POL_OFF + mvchip->offset, 592 &polarity); 593 polarity ^= BIT(i); 594 regmap_write(mvchip->regs, 595 GPIO_IN_POL_OFF + mvchip->offset, 596 polarity); 597 } 598 599 generic_handle_irq(irq); 600 } 601 602 chained_irq_exit(chip, desc); 603 } 604 605 static const struct regmap_config mvebu_gpio_regmap_config = { 606 .reg_bits = 32, 607 .reg_stride = 4, 608 .val_bits = 32, 609 .fast_io = true, 610 }; 611 612 /* 613 * Functions implementing the pwm_chip methods 614 */ 615 static struct mvebu_pwm *to_mvebu_pwm(struct pwm_chip *chip) 616 { 617 return container_of(chip, struct mvebu_pwm, chip); 618 } 619 620 static int mvebu_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm) 621 { 622 struct mvebu_pwm *mvpwm = to_mvebu_pwm(chip); 623 struct mvebu_gpio_chip *mvchip = mvpwm->mvchip; 624 struct gpio_desc *desc; 625 unsigned long flags; 626 int ret = 0; 627 628 spin_lock_irqsave(&mvpwm->lock, flags); 629 630 if (mvpwm->gpiod) { 631 ret = -EBUSY; 632 } else { 633 desc = gpiochip_request_own_desc(&mvchip->chip, 634 pwm->hwpwm, "mvebu-pwm", 635 GPIO_ACTIVE_HIGH, 636 GPIOD_OUT_LOW); 637 if (IS_ERR(desc)) { 638 ret = PTR_ERR(desc); 639 goto out; 640 } 641 642 mvpwm->gpiod = desc; 643 } 644 out: 645 spin_unlock_irqrestore(&mvpwm->lock, flags); 646 return ret; 647 } 648 649 static void mvebu_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm) 650 { 651 struct mvebu_pwm *mvpwm = to_mvebu_pwm(chip); 652 unsigned long flags; 653 654 spin_lock_irqsave(&mvpwm->lock, flags); 655 gpiochip_free_own_desc(mvpwm->gpiod); 656 mvpwm->gpiod = NULL; 657 spin_unlock_irqrestore(&mvpwm->lock, flags); 658 } 659 660 static int mvebu_pwm_get_state(struct pwm_chip *chip, 661 struct pwm_device *pwm, 662 struct pwm_state *state) 663 { 664 665 struct mvebu_pwm *mvpwm = to_mvebu_pwm(chip); 666 struct mvebu_gpio_chip *mvchip = mvpwm->mvchip; 667 unsigned long long val; 668 unsigned long flags; 669 u32 u; 670 671 spin_lock_irqsave(&mvpwm->lock, flags); 672 673 regmap_read(mvpwm->regs, mvebu_pwmreg_blink_on_duration(mvpwm), &u); 674 /* Hardware treats zero as 2^32. See mvebu_pwm_apply(). */ 675 if (u > 0) 676 val = u; 677 else 678 val = UINT_MAX + 1ULL; 679 state->duty_cycle = DIV_ROUND_UP_ULL(val * NSEC_PER_SEC, 680 mvpwm->clk_rate); 681 682 regmap_read(mvpwm->regs, mvebu_pwmreg_blink_off_duration(mvpwm), &u); 683 /* period = on + off duration */ 684 if (u > 0) 685 val += u; 686 else 687 val += UINT_MAX + 1ULL; 688 state->period = DIV_ROUND_UP_ULL(val * NSEC_PER_SEC, mvpwm->clk_rate); 689 690 regmap_read(mvchip->regs, GPIO_BLINK_EN_OFF + mvchip->offset, &u); 691 if (u) 692 state->enabled = true; 693 else 694 state->enabled = false; 695 696 spin_unlock_irqrestore(&mvpwm->lock, flags); 697 698 return 0; 699 } 700 701 static int mvebu_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, 702 const struct pwm_state *state) 703 { 704 struct mvebu_pwm *mvpwm = to_mvebu_pwm(chip); 705 struct mvebu_gpio_chip *mvchip = mvpwm->mvchip; 706 unsigned long long val; 707 unsigned long flags; 708 unsigned int on, off; 709 710 if (state->polarity != PWM_POLARITY_NORMAL) 711 return -EINVAL; 712 713 val = (unsigned long long) mvpwm->clk_rate * state->duty_cycle; 714 do_div(val, NSEC_PER_SEC); 715 if (val > UINT_MAX + 1ULL) 716 return -EINVAL; 717 /* 718 * Zero on/off values don't work as expected. Experimentation shows 719 * that zero value is treated as 2^32. This behavior is not documented. 720 */ 721 if (val == UINT_MAX + 1ULL) 722 on = 0; 723 else if (val) 724 on = val; 725 else 726 on = 1; 727 728 val = (unsigned long long) mvpwm->clk_rate * state->period; 729 do_div(val, NSEC_PER_SEC); 730 val -= on; 731 if (val > UINT_MAX + 1ULL) 732 return -EINVAL; 733 if (val == UINT_MAX + 1ULL) 734 off = 0; 735 else if (val) 736 off = val; 737 else 738 off = 1; 739 740 spin_lock_irqsave(&mvpwm->lock, flags); 741 742 regmap_write(mvpwm->regs, mvebu_pwmreg_blink_on_duration(mvpwm), on); 743 regmap_write(mvpwm->regs, mvebu_pwmreg_blink_off_duration(mvpwm), off); 744 if (state->enabled) 745 mvebu_gpio_blink(&mvchip->chip, pwm->hwpwm, 1); 746 else 747 mvebu_gpio_blink(&mvchip->chip, pwm->hwpwm, 0); 748 749 spin_unlock_irqrestore(&mvpwm->lock, flags); 750 751 return 0; 752 } 753 754 static const struct pwm_ops mvebu_pwm_ops = { 755 .request = mvebu_pwm_request, 756 .free = mvebu_pwm_free, 757 .get_state = mvebu_pwm_get_state, 758 .apply = mvebu_pwm_apply, 759 .owner = THIS_MODULE, 760 }; 761 762 static void __maybe_unused mvebu_pwm_suspend(struct mvebu_gpio_chip *mvchip) 763 { 764 struct mvebu_pwm *mvpwm = mvchip->mvpwm; 765 766 regmap_read(mvchip->regs, GPIO_BLINK_CNT_SELECT_OFF + mvchip->offset, 767 &mvpwm->blink_select); 768 regmap_read(mvpwm->regs, mvebu_pwmreg_blink_on_duration(mvpwm), 769 &mvpwm->blink_on_duration); 770 regmap_read(mvpwm->regs, mvebu_pwmreg_blink_off_duration(mvpwm), 771 &mvpwm->blink_off_duration); 772 } 773 774 static void __maybe_unused mvebu_pwm_resume(struct mvebu_gpio_chip *mvchip) 775 { 776 struct mvebu_pwm *mvpwm = mvchip->mvpwm; 777 778 regmap_write(mvchip->regs, GPIO_BLINK_CNT_SELECT_OFF + mvchip->offset, 779 mvpwm->blink_select); 780 regmap_write(mvpwm->regs, mvebu_pwmreg_blink_on_duration(mvpwm), 781 mvpwm->blink_on_duration); 782 regmap_write(mvpwm->regs, mvebu_pwmreg_blink_off_duration(mvpwm), 783 mvpwm->blink_off_duration); 784 } 785 786 static int mvebu_pwm_probe(struct platform_device *pdev, 787 struct mvebu_gpio_chip *mvchip, 788 int id) 789 { 790 struct device *dev = &pdev->dev; 791 struct mvebu_pwm *mvpwm; 792 void __iomem *base; 793 u32 offset; 794 u32 set; 795 796 if (mvchip->soc_variant == MVEBU_GPIO_SOC_VARIANT_A8K) { 797 int ret = of_property_read_u32(dev->of_node, 798 "marvell,pwm-offset", &offset); 799 if (ret < 0) 800 return 0; 801 } else { 802 /* 803 * There are only two sets of PWM configuration registers for 804 * all the GPIO lines on those SoCs which this driver reserves 805 * for the first two GPIO chips. So if the resource is missing 806 * we can't treat it as an error. 807 */ 808 if (!platform_get_resource_byname(pdev, IORESOURCE_MEM, "pwm")) 809 return 0; 810 offset = 0; 811 } 812 813 if (IS_ERR(mvchip->clk)) 814 return PTR_ERR(mvchip->clk); 815 816 mvpwm = devm_kzalloc(dev, sizeof(struct mvebu_pwm), GFP_KERNEL); 817 if (!mvpwm) 818 return -ENOMEM; 819 mvchip->mvpwm = mvpwm; 820 mvpwm->mvchip = mvchip; 821 mvpwm->offset = offset; 822 823 if (mvchip->soc_variant == MVEBU_GPIO_SOC_VARIANT_A8K) { 824 mvpwm->regs = mvchip->regs; 825 826 switch (mvchip->offset) { 827 case AP80X_GPIO0_OFF_A8K: 828 case CP11X_GPIO0_OFF_A8K: 829 /* Blink counter A */ 830 set = 0; 831 break; 832 case CP11X_GPIO1_OFF_A8K: 833 /* Blink counter B */ 834 set = U32_MAX; 835 mvpwm->offset += PWM_BLINK_COUNTER_B_OFF; 836 break; 837 default: 838 return -EINVAL; 839 } 840 } else { 841 base = devm_platform_ioremap_resource_byname(pdev, "pwm"); 842 if (IS_ERR(base)) 843 return PTR_ERR(base); 844 845 mvpwm->regs = devm_regmap_init_mmio(&pdev->dev, base, 846 &mvebu_gpio_regmap_config); 847 if (IS_ERR(mvpwm->regs)) 848 return PTR_ERR(mvpwm->regs); 849 850 /* 851 * Use set A for lines of GPIO chip with id 0, B for GPIO chip 852 * with id 1. Don't allow further GPIO chips to be used for PWM. 853 */ 854 if (id == 0) 855 set = 0; 856 else if (id == 1) 857 set = U32_MAX; 858 else 859 return -EINVAL; 860 } 861 862 regmap_write(mvchip->regs, 863 GPIO_BLINK_CNT_SELECT_OFF + mvchip->offset, set); 864 865 mvpwm->clk_rate = clk_get_rate(mvchip->clk); 866 if (!mvpwm->clk_rate) { 867 dev_err(dev, "failed to get clock rate\n"); 868 return -EINVAL; 869 } 870 871 mvpwm->chip.dev = dev; 872 mvpwm->chip.ops = &mvebu_pwm_ops; 873 mvpwm->chip.npwm = mvchip->chip.ngpio; 874 875 spin_lock_init(&mvpwm->lock); 876 877 return devm_pwmchip_add(dev, &mvpwm->chip); 878 } 879 880 #ifdef CONFIG_DEBUG_FS 881 #include <linux/seq_file.h> 882 883 static void mvebu_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip) 884 { 885 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip); 886 u32 out, io_conf, blink, in_pol, data_in, cause, edg_msk, lvl_msk; 887 const char *label; 888 int i; 889 890 regmap_read(mvchip->regs, GPIO_OUT_OFF + mvchip->offset, &out); 891 regmap_read(mvchip->regs, GPIO_IO_CONF_OFF + mvchip->offset, &io_conf); 892 regmap_read(mvchip->regs, GPIO_BLINK_EN_OFF + mvchip->offset, &blink); 893 regmap_read(mvchip->regs, GPIO_IN_POL_OFF + mvchip->offset, &in_pol); 894 regmap_read(mvchip->regs, GPIO_DATA_IN_OFF + mvchip->offset, &data_in); 895 cause = mvebu_gpio_read_edge_cause(mvchip); 896 edg_msk = mvebu_gpio_read_edge_mask(mvchip); 897 lvl_msk = mvebu_gpio_read_level_mask(mvchip); 898 899 for_each_requested_gpio(chip, i, label) { 900 u32 msk; 901 bool is_out; 902 903 msk = BIT(i); 904 is_out = !(io_conf & msk); 905 906 seq_printf(s, " gpio-%-3d (%-20.20s)", chip->base + i, label); 907 908 if (is_out) { 909 seq_printf(s, " out %s %s\n", 910 out & msk ? "hi" : "lo", 911 blink & msk ? "(blink )" : ""); 912 continue; 913 } 914 915 seq_printf(s, " in %s (act %s) - IRQ", 916 (data_in ^ in_pol) & msk ? "hi" : "lo", 917 in_pol & msk ? "lo" : "hi"); 918 if (!((edg_msk | lvl_msk) & msk)) { 919 seq_puts(s, " disabled\n"); 920 continue; 921 } 922 if (edg_msk & msk) 923 seq_puts(s, " edge "); 924 if (lvl_msk & msk) 925 seq_puts(s, " level"); 926 seq_printf(s, " (%s)\n", cause & msk ? "pending" : "clear "); 927 } 928 } 929 #else 930 #define mvebu_gpio_dbg_show NULL 931 #endif 932 933 static const struct of_device_id mvebu_gpio_of_match[] = { 934 { 935 .compatible = "marvell,orion-gpio", 936 .data = (void *) MVEBU_GPIO_SOC_VARIANT_ORION, 937 }, 938 { 939 .compatible = "marvell,mv78200-gpio", 940 .data = (void *) MVEBU_GPIO_SOC_VARIANT_MV78200, 941 }, 942 { 943 .compatible = "marvell,armadaxp-gpio", 944 .data = (void *) MVEBU_GPIO_SOC_VARIANT_ARMADAXP, 945 }, 946 { 947 .compatible = "marvell,armada-370-gpio", 948 .data = (void *) MVEBU_GPIO_SOC_VARIANT_ORION, 949 }, 950 { 951 .compatible = "marvell,armada-8k-gpio", 952 .data = (void *) MVEBU_GPIO_SOC_VARIANT_A8K, 953 }, 954 { 955 /* sentinel */ 956 }, 957 }; 958 959 static int mvebu_gpio_suspend(struct platform_device *pdev, pm_message_t state) 960 { 961 struct mvebu_gpio_chip *mvchip = platform_get_drvdata(pdev); 962 int i; 963 964 regmap_read(mvchip->regs, GPIO_OUT_OFF + mvchip->offset, 965 &mvchip->out_reg); 966 regmap_read(mvchip->regs, GPIO_IO_CONF_OFF + mvchip->offset, 967 &mvchip->io_conf_reg); 968 regmap_read(mvchip->regs, GPIO_BLINK_EN_OFF + mvchip->offset, 969 &mvchip->blink_en_reg); 970 regmap_read(mvchip->regs, GPIO_IN_POL_OFF + mvchip->offset, 971 &mvchip->in_pol_reg); 972 973 switch (mvchip->soc_variant) { 974 case MVEBU_GPIO_SOC_VARIANT_ORION: 975 case MVEBU_GPIO_SOC_VARIANT_A8K: 976 regmap_read(mvchip->regs, GPIO_EDGE_MASK_OFF + mvchip->offset, 977 &mvchip->edge_mask_regs[0]); 978 regmap_read(mvchip->regs, GPIO_LEVEL_MASK_OFF + mvchip->offset, 979 &mvchip->level_mask_regs[0]); 980 break; 981 case MVEBU_GPIO_SOC_VARIANT_MV78200: 982 for (i = 0; i < 2; i++) { 983 regmap_read(mvchip->regs, 984 GPIO_EDGE_MASK_MV78200_OFF(i), 985 &mvchip->edge_mask_regs[i]); 986 regmap_read(mvchip->regs, 987 GPIO_LEVEL_MASK_MV78200_OFF(i), 988 &mvchip->level_mask_regs[i]); 989 } 990 break; 991 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP: 992 for (i = 0; i < 4; i++) { 993 regmap_read(mvchip->regs, 994 GPIO_EDGE_MASK_ARMADAXP_OFF(i), 995 &mvchip->edge_mask_regs[i]); 996 regmap_read(mvchip->regs, 997 GPIO_LEVEL_MASK_ARMADAXP_OFF(i), 998 &mvchip->level_mask_regs[i]); 999 } 1000 break; 1001 default: 1002 BUG(); 1003 } 1004 1005 if (IS_REACHABLE(CONFIG_PWM)) 1006 mvebu_pwm_suspend(mvchip); 1007 1008 return 0; 1009 } 1010 1011 static int mvebu_gpio_resume(struct platform_device *pdev) 1012 { 1013 struct mvebu_gpio_chip *mvchip = platform_get_drvdata(pdev); 1014 int i; 1015 1016 regmap_write(mvchip->regs, GPIO_OUT_OFF + mvchip->offset, 1017 mvchip->out_reg); 1018 regmap_write(mvchip->regs, GPIO_IO_CONF_OFF + mvchip->offset, 1019 mvchip->io_conf_reg); 1020 regmap_write(mvchip->regs, GPIO_BLINK_EN_OFF + mvchip->offset, 1021 mvchip->blink_en_reg); 1022 regmap_write(mvchip->regs, GPIO_IN_POL_OFF + mvchip->offset, 1023 mvchip->in_pol_reg); 1024 1025 switch (mvchip->soc_variant) { 1026 case MVEBU_GPIO_SOC_VARIANT_ORION: 1027 case MVEBU_GPIO_SOC_VARIANT_A8K: 1028 regmap_write(mvchip->regs, GPIO_EDGE_MASK_OFF + mvchip->offset, 1029 mvchip->edge_mask_regs[0]); 1030 regmap_write(mvchip->regs, GPIO_LEVEL_MASK_OFF + mvchip->offset, 1031 mvchip->level_mask_regs[0]); 1032 break; 1033 case MVEBU_GPIO_SOC_VARIANT_MV78200: 1034 for (i = 0; i < 2; i++) { 1035 regmap_write(mvchip->regs, 1036 GPIO_EDGE_MASK_MV78200_OFF(i), 1037 mvchip->edge_mask_regs[i]); 1038 regmap_write(mvchip->regs, 1039 GPIO_LEVEL_MASK_MV78200_OFF(i), 1040 mvchip->level_mask_regs[i]); 1041 } 1042 break; 1043 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP: 1044 for (i = 0; i < 4; i++) { 1045 regmap_write(mvchip->regs, 1046 GPIO_EDGE_MASK_ARMADAXP_OFF(i), 1047 mvchip->edge_mask_regs[i]); 1048 regmap_write(mvchip->regs, 1049 GPIO_LEVEL_MASK_ARMADAXP_OFF(i), 1050 mvchip->level_mask_regs[i]); 1051 } 1052 break; 1053 default: 1054 BUG(); 1055 } 1056 1057 if (IS_REACHABLE(CONFIG_PWM)) 1058 mvebu_pwm_resume(mvchip); 1059 1060 return 0; 1061 } 1062 1063 static int mvebu_gpio_probe_raw(struct platform_device *pdev, 1064 struct mvebu_gpio_chip *mvchip) 1065 { 1066 void __iomem *base; 1067 1068 base = devm_platform_ioremap_resource(pdev, 0); 1069 if (IS_ERR(base)) 1070 return PTR_ERR(base); 1071 1072 mvchip->regs = devm_regmap_init_mmio(&pdev->dev, base, 1073 &mvebu_gpio_regmap_config); 1074 if (IS_ERR(mvchip->regs)) 1075 return PTR_ERR(mvchip->regs); 1076 1077 /* 1078 * For the legacy SoCs, the regmap directly maps to the GPIO 1079 * registers, so no offset is needed. 1080 */ 1081 mvchip->offset = 0; 1082 1083 /* 1084 * The Armada XP has a second range of registers for the 1085 * per-CPU registers 1086 */ 1087 if (mvchip->soc_variant == MVEBU_GPIO_SOC_VARIANT_ARMADAXP) { 1088 base = devm_platform_ioremap_resource(pdev, 1); 1089 if (IS_ERR(base)) 1090 return PTR_ERR(base); 1091 1092 mvchip->percpu_regs = 1093 devm_regmap_init_mmio(&pdev->dev, base, 1094 &mvebu_gpio_regmap_config); 1095 if (IS_ERR(mvchip->percpu_regs)) 1096 return PTR_ERR(mvchip->percpu_regs); 1097 } 1098 1099 return 0; 1100 } 1101 1102 static int mvebu_gpio_probe_syscon(struct platform_device *pdev, 1103 struct mvebu_gpio_chip *mvchip) 1104 { 1105 mvchip->regs = syscon_node_to_regmap(pdev->dev.parent->of_node); 1106 if (IS_ERR(mvchip->regs)) 1107 return PTR_ERR(mvchip->regs); 1108 1109 if (of_property_read_u32(pdev->dev.of_node, "offset", &mvchip->offset)) 1110 return -EINVAL; 1111 1112 return 0; 1113 } 1114 1115 static void mvebu_gpio_remove_irq_domain(void *data) 1116 { 1117 struct irq_domain *domain = data; 1118 1119 irq_domain_remove(domain); 1120 } 1121 1122 static int mvebu_gpio_probe(struct platform_device *pdev) 1123 { 1124 struct mvebu_gpio_chip *mvchip; 1125 const struct of_device_id *match; 1126 struct device_node *np = pdev->dev.of_node; 1127 struct irq_chip_generic *gc; 1128 struct irq_chip_type *ct; 1129 unsigned int ngpios; 1130 bool have_irqs; 1131 int soc_variant; 1132 int i, cpu, id; 1133 int err; 1134 1135 match = of_match_device(mvebu_gpio_of_match, &pdev->dev); 1136 if (match) 1137 soc_variant = (unsigned long) match->data; 1138 else 1139 soc_variant = MVEBU_GPIO_SOC_VARIANT_ORION; 1140 1141 /* Some gpio controllers do not provide irq support */ 1142 err = platform_irq_count(pdev); 1143 if (err < 0) 1144 return err; 1145 1146 have_irqs = err != 0; 1147 1148 mvchip = devm_kzalloc(&pdev->dev, sizeof(struct mvebu_gpio_chip), 1149 GFP_KERNEL); 1150 if (!mvchip) 1151 return -ENOMEM; 1152 1153 platform_set_drvdata(pdev, mvchip); 1154 1155 if (of_property_read_u32(pdev->dev.of_node, "ngpios", &ngpios)) { 1156 dev_err(&pdev->dev, "Missing ngpios OF property\n"); 1157 return -ENODEV; 1158 } 1159 1160 id = of_alias_get_id(pdev->dev.of_node, "gpio"); 1161 if (id < 0) { 1162 dev_err(&pdev->dev, "Couldn't get OF id\n"); 1163 return id; 1164 } 1165 1166 mvchip->clk = devm_clk_get(&pdev->dev, NULL); 1167 /* Not all SoCs require a clock.*/ 1168 if (!IS_ERR(mvchip->clk)) 1169 clk_prepare_enable(mvchip->clk); 1170 1171 mvchip->soc_variant = soc_variant; 1172 mvchip->chip.label = dev_name(&pdev->dev); 1173 mvchip->chip.parent = &pdev->dev; 1174 mvchip->chip.request = gpiochip_generic_request; 1175 mvchip->chip.free = gpiochip_generic_free; 1176 mvchip->chip.get_direction = mvebu_gpio_get_direction; 1177 mvchip->chip.direction_input = mvebu_gpio_direction_input; 1178 mvchip->chip.get = mvebu_gpio_get; 1179 mvchip->chip.direction_output = mvebu_gpio_direction_output; 1180 mvchip->chip.set = mvebu_gpio_set; 1181 if (have_irqs) 1182 mvchip->chip.to_irq = mvebu_gpio_to_irq; 1183 mvchip->chip.base = id * MVEBU_MAX_GPIO_PER_BANK; 1184 mvchip->chip.ngpio = ngpios; 1185 mvchip->chip.can_sleep = false; 1186 mvchip->chip.dbg_show = mvebu_gpio_dbg_show; 1187 1188 if (soc_variant == MVEBU_GPIO_SOC_VARIANT_A8K) 1189 err = mvebu_gpio_probe_syscon(pdev, mvchip); 1190 else 1191 err = mvebu_gpio_probe_raw(pdev, mvchip); 1192 1193 if (err) 1194 return err; 1195 1196 /* 1197 * Mask and clear GPIO interrupts. 1198 */ 1199 switch (soc_variant) { 1200 case MVEBU_GPIO_SOC_VARIANT_ORION: 1201 case MVEBU_GPIO_SOC_VARIANT_A8K: 1202 regmap_write(mvchip->regs, 1203 GPIO_EDGE_CAUSE_OFF + mvchip->offset, 0); 1204 regmap_write(mvchip->regs, 1205 GPIO_EDGE_MASK_OFF + mvchip->offset, 0); 1206 regmap_write(mvchip->regs, 1207 GPIO_LEVEL_MASK_OFF + mvchip->offset, 0); 1208 break; 1209 case MVEBU_GPIO_SOC_VARIANT_MV78200: 1210 regmap_write(mvchip->regs, GPIO_EDGE_CAUSE_OFF, 0); 1211 for (cpu = 0; cpu < 2; cpu++) { 1212 regmap_write(mvchip->regs, 1213 GPIO_EDGE_MASK_MV78200_OFF(cpu), 0); 1214 regmap_write(mvchip->regs, 1215 GPIO_LEVEL_MASK_MV78200_OFF(cpu), 0); 1216 } 1217 break; 1218 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP: 1219 regmap_write(mvchip->regs, GPIO_EDGE_CAUSE_OFF, 0); 1220 regmap_write(mvchip->regs, GPIO_EDGE_MASK_OFF, 0); 1221 regmap_write(mvchip->regs, GPIO_LEVEL_MASK_OFF, 0); 1222 for (cpu = 0; cpu < 4; cpu++) { 1223 regmap_write(mvchip->percpu_regs, 1224 GPIO_EDGE_CAUSE_ARMADAXP_OFF(cpu), 0); 1225 regmap_write(mvchip->percpu_regs, 1226 GPIO_EDGE_MASK_ARMADAXP_OFF(cpu), 0); 1227 regmap_write(mvchip->percpu_regs, 1228 GPIO_LEVEL_MASK_ARMADAXP_OFF(cpu), 0); 1229 } 1230 break; 1231 default: 1232 BUG(); 1233 } 1234 1235 devm_gpiochip_add_data(&pdev->dev, &mvchip->chip, mvchip); 1236 1237 /* Some MVEBU SoCs have simple PWM support for GPIO lines */ 1238 if (IS_REACHABLE(CONFIG_PWM)) { 1239 err = mvebu_pwm_probe(pdev, mvchip, id); 1240 if (err) 1241 return err; 1242 } 1243 1244 /* Some gpio controllers do not provide irq support */ 1245 if (!have_irqs) 1246 return 0; 1247 1248 mvchip->domain = 1249 irq_domain_add_linear(np, ngpios, &irq_generic_chip_ops, NULL); 1250 if (!mvchip->domain) { 1251 dev_err(&pdev->dev, "couldn't allocate irq domain %s (DT).\n", 1252 mvchip->chip.label); 1253 return -ENODEV; 1254 } 1255 1256 err = devm_add_action_or_reset(&pdev->dev, mvebu_gpio_remove_irq_domain, 1257 mvchip->domain); 1258 if (err) 1259 return err; 1260 1261 err = irq_alloc_domain_generic_chips( 1262 mvchip->domain, ngpios, 2, np->name, handle_level_irq, 1263 IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_LEVEL, 0, 0); 1264 if (err) { 1265 dev_err(&pdev->dev, "couldn't allocate irq chips %s (DT).\n", 1266 mvchip->chip.label); 1267 return err; 1268 } 1269 1270 /* 1271 * NOTE: The common accessors cannot be used because of the percpu 1272 * access to the mask registers 1273 */ 1274 gc = irq_get_domain_generic_chip(mvchip->domain, 0); 1275 gc->private = mvchip; 1276 ct = &gc->chip_types[0]; 1277 ct->type = IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW; 1278 ct->chip.irq_mask = mvebu_gpio_level_irq_mask; 1279 ct->chip.irq_unmask = mvebu_gpio_level_irq_unmask; 1280 ct->chip.irq_set_type = mvebu_gpio_irq_set_type; 1281 ct->chip.name = mvchip->chip.label; 1282 1283 ct = &gc->chip_types[1]; 1284 ct->type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING; 1285 ct->chip.irq_ack = mvebu_gpio_irq_ack; 1286 ct->chip.irq_mask = mvebu_gpio_edge_irq_mask; 1287 ct->chip.irq_unmask = mvebu_gpio_edge_irq_unmask; 1288 ct->chip.irq_set_type = mvebu_gpio_irq_set_type; 1289 ct->handler = handle_edge_irq; 1290 ct->chip.name = mvchip->chip.label; 1291 1292 /* 1293 * Setup the interrupt handlers. Each chip can have up to 4 1294 * interrupt handlers, with each handler dealing with 8 GPIO 1295 * pins. 1296 */ 1297 for (i = 0; i < 4; i++) { 1298 int irq = platform_get_irq_optional(pdev, i); 1299 1300 if (irq < 0) 1301 continue; 1302 irq_set_chained_handler_and_data(irq, mvebu_gpio_irq_handler, 1303 mvchip); 1304 } 1305 1306 return 0; 1307 } 1308 1309 static struct platform_driver mvebu_gpio_driver = { 1310 .driver = { 1311 .name = "mvebu-gpio", 1312 .of_match_table = mvebu_gpio_of_match, 1313 }, 1314 .probe = mvebu_gpio_probe, 1315 .suspend = mvebu_gpio_suspend, 1316 .resume = mvebu_gpio_resume, 1317 }; 1318 builtin_platform_driver(mvebu_gpio_driver); 1319