1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2014-2017 Broadcom 4 */ 5 6 /* 7 * This file contains the Broadcom Iproc GPIO driver that supports 3 8 * GPIO controllers on Iproc including the ASIU GPIO controller, the 9 * chipCommonG GPIO controller, and the always-on GPIO controller. Basic 10 * PINCONF such as bias pull up/down, and drive strength are also supported 11 * in this driver. 12 * 13 * It provides the functionality where pins from the GPIO can be 14 * individually muxed to GPIO function, if individual pad 15 * configuration is supported, through the interaction with respective 16 * SoCs IOMUX controller. 17 */ 18 19 #include <linux/kernel.h> 20 #include <linux/slab.h> 21 #include <linux/interrupt.h> 22 #include <linux/io.h> 23 #include <linux/gpio/driver.h> 24 #include <linux/ioport.h> 25 #include <linux/of_device.h> 26 #include <linux/of_irq.h> 27 #include <linux/pinctrl/pinctrl.h> 28 #include <linux/pinctrl/pinconf.h> 29 #include <linux/pinctrl/pinconf-generic.h> 30 31 #include "../pinctrl-utils.h" 32 33 #define IPROC_GPIO_DATA_IN_OFFSET 0x00 34 #define IPROC_GPIO_DATA_OUT_OFFSET 0x04 35 #define IPROC_GPIO_OUT_EN_OFFSET 0x08 36 #define IPROC_GPIO_INT_TYPE_OFFSET 0x0c 37 #define IPROC_GPIO_INT_DE_OFFSET 0x10 38 #define IPROC_GPIO_INT_EDGE_OFFSET 0x14 39 #define IPROC_GPIO_INT_MSK_OFFSET 0x18 40 #define IPROC_GPIO_INT_STAT_OFFSET 0x1c 41 #define IPROC_GPIO_INT_MSTAT_OFFSET 0x20 42 #define IPROC_GPIO_INT_CLR_OFFSET 0x24 43 #define IPROC_GPIO_PAD_RES_OFFSET 0x34 44 #define IPROC_GPIO_RES_EN_OFFSET 0x38 45 46 /* drive strength control for ASIU GPIO */ 47 #define IPROC_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58 48 49 /* pinconf for CCM GPIO */ 50 #define IPROC_GPIO_PULL_DN_OFFSET 0x10 51 #define IPROC_GPIO_PULL_UP_OFFSET 0x14 52 53 /* pinconf for CRMU(aon) GPIO and CCM GPIO*/ 54 #define IPROC_GPIO_DRV_CTRL_OFFSET 0x00 55 56 #define GPIO_BANK_SIZE 0x200 57 #define NGPIOS_PER_BANK 32 58 #define GPIO_BANK(pin) ((pin) / NGPIOS_PER_BANK) 59 60 #define IPROC_GPIO_REG(pin, reg) (GPIO_BANK(pin) * GPIO_BANK_SIZE + (reg)) 61 #define IPROC_GPIO_SHIFT(pin) ((pin) % NGPIOS_PER_BANK) 62 63 #define GPIO_DRV_STRENGTH_BIT_SHIFT 20 64 #define GPIO_DRV_STRENGTH_BITS 3 65 #define GPIO_DRV_STRENGTH_BIT_MASK ((1 << GPIO_DRV_STRENGTH_BITS) - 1) 66 67 enum iproc_pinconf_param { 68 IPROC_PINCONF_DRIVE_STRENGTH = 0, 69 IPROC_PINCONF_BIAS_DISABLE, 70 IPROC_PINCONF_BIAS_PULL_UP, 71 IPROC_PINCONF_BIAS_PULL_DOWN, 72 IPROC_PINCON_MAX, 73 }; 74 75 enum iproc_pinconf_ctrl_type { 76 IOCTRL_TYPE_AON = 1, 77 IOCTRL_TYPE_CDRU, 78 IOCTRL_TYPE_INVALID, 79 }; 80 81 /* 82 * Iproc GPIO core 83 * 84 * @dev: pointer to device 85 * @base: I/O register base for Iproc GPIO controller 86 * @io_ctrl: I/O register base for certain type of Iproc GPIO controller that 87 * has the PINCONF support implemented outside of the GPIO block 88 * @lock: lock to protect access to I/O registers 89 * @gc: GPIO chip 90 * @num_banks: number of GPIO banks, each bank supports up to 32 GPIOs 91 * @pinmux_is_supported: flag to indicate this GPIO controller contains pins 92 * that can be individually muxed to GPIO 93 * @pinconf_disable: contains a list of PINCONF parameters that need to be 94 * disabled 95 * @nr_pinconf_disable: total number of PINCONF parameters that need to be 96 * disabled 97 * @pctl: pointer to pinctrl_dev 98 * @pctldesc: pinctrl descriptor 99 */ 100 struct iproc_gpio { 101 struct device *dev; 102 103 void __iomem *base; 104 void __iomem *io_ctrl; 105 enum iproc_pinconf_ctrl_type io_ctrl_type; 106 107 raw_spinlock_t lock; 108 109 struct irq_chip irqchip; 110 struct gpio_chip gc; 111 unsigned num_banks; 112 113 bool pinmux_is_supported; 114 115 enum pin_config_param *pinconf_disable; 116 unsigned int nr_pinconf_disable; 117 118 struct pinctrl_dev *pctl; 119 struct pinctrl_desc pctldesc; 120 }; 121 122 /* 123 * Mapping from PINCONF pins to GPIO pins is 1-to-1 124 */ 125 static inline unsigned iproc_pin_to_gpio(unsigned pin) 126 { 127 return pin; 128 } 129 130 /** 131 * iproc_set_bit - set or clear one bit (corresponding to the GPIO pin) in a 132 * Iproc GPIO register 133 * 134 * @iproc_gpio: Iproc GPIO device 135 * @reg: register offset 136 * @gpio: GPIO pin 137 * @set: set or clear 138 */ 139 static inline void iproc_set_bit(struct iproc_gpio *chip, unsigned int reg, 140 unsigned gpio, bool set) 141 { 142 unsigned int offset = IPROC_GPIO_REG(gpio, reg); 143 unsigned int shift = IPROC_GPIO_SHIFT(gpio); 144 u32 val; 145 146 val = readl(chip->base + offset); 147 if (set) 148 val |= BIT(shift); 149 else 150 val &= ~BIT(shift); 151 writel(val, chip->base + offset); 152 } 153 154 static inline bool iproc_get_bit(struct iproc_gpio *chip, unsigned int reg, 155 unsigned gpio) 156 { 157 unsigned int offset = IPROC_GPIO_REG(gpio, reg); 158 unsigned int shift = IPROC_GPIO_SHIFT(gpio); 159 160 return !!(readl(chip->base + offset) & BIT(shift)); 161 } 162 163 static void iproc_gpio_irq_handler(struct irq_desc *desc) 164 { 165 struct gpio_chip *gc = irq_desc_get_handler_data(desc); 166 struct iproc_gpio *chip = gpiochip_get_data(gc); 167 struct irq_chip *irq_chip = irq_desc_get_chip(desc); 168 int i, bit; 169 170 chained_irq_enter(irq_chip, desc); 171 172 /* go through the entire GPIO banks and handle all interrupts */ 173 for (i = 0; i < chip->num_banks; i++) { 174 unsigned long val = readl(chip->base + (i * GPIO_BANK_SIZE) + 175 IPROC_GPIO_INT_MSTAT_OFFSET); 176 177 for_each_set_bit(bit, &val, NGPIOS_PER_BANK) { 178 unsigned pin = NGPIOS_PER_BANK * i + bit; 179 int child_irq = irq_find_mapping(gc->irq.domain, pin); 180 181 /* 182 * Clear the interrupt before invoking the 183 * handler, so we do not leave any window 184 */ 185 writel(BIT(bit), chip->base + (i * GPIO_BANK_SIZE) + 186 IPROC_GPIO_INT_CLR_OFFSET); 187 188 generic_handle_irq(child_irq); 189 } 190 } 191 192 chained_irq_exit(irq_chip, desc); 193 } 194 195 196 static void iproc_gpio_irq_ack(struct irq_data *d) 197 { 198 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 199 struct iproc_gpio *chip = gpiochip_get_data(gc); 200 unsigned gpio = d->hwirq; 201 unsigned int offset = IPROC_GPIO_REG(gpio, 202 IPROC_GPIO_INT_CLR_OFFSET); 203 unsigned int shift = IPROC_GPIO_SHIFT(gpio); 204 u32 val = BIT(shift); 205 206 writel(val, chip->base + offset); 207 } 208 209 /** 210 * iproc_gpio_irq_set_mask - mask/unmask a GPIO interrupt 211 * 212 * @d: IRQ chip data 213 * @unmask: mask/unmask GPIO interrupt 214 */ 215 static void iproc_gpio_irq_set_mask(struct irq_data *d, bool unmask) 216 { 217 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 218 struct iproc_gpio *chip = gpiochip_get_data(gc); 219 unsigned gpio = d->hwirq; 220 221 iproc_set_bit(chip, IPROC_GPIO_INT_MSK_OFFSET, gpio, unmask); 222 } 223 224 static void iproc_gpio_irq_mask(struct irq_data *d) 225 { 226 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 227 struct iproc_gpio *chip = gpiochip_get_data(gc); 228 unsigned long flags; 229 230 raw_spin_lock_irqsave(&chip->lock, flags); 231 iproc_gpio_irq_set_mask(d, false); 232 raw_spin_unlock_irqrestore(&chip->lock, flags); 233 } 234 235 static void iproc_gpio_irq_unmask(struct irq_data *d) 236 { 237 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 238 struct iproc_gpio *chip = gpiochip_get_data(gc); 239 unsigned long flags; 240 241 raw_spin_lock_irqsave(&chip->lock, flags); 242 iproc_gpio_irq_set_mask(d, true); 243 raw_spin_unlock_irqrestore(&chip->lock, flags); 244 } 245 246 static int iproc_gpio_irq_set_type(struct irq_data *d, unsigned int type) 247 { 248 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 249 struct iproc_gpio *chip = gpiochip_get_data(gc); 250 unsigned gpio = d->hwirq; 251 bool level_triggered = false; 252 bool dual_edge = false; 253 bool rising_or_high = false; 254 unsigned long flags; 255 256 switch (type & IRQ_TYPE_SENSE_MASK) { 257 case IRQ_TYPE_EDGE_RISING: 258 rising_or_high = true; 259 break; 260 261 case IRQ_TYPE_EDGE_FALLING: 262 break; 263 264 case IRQ_TYPE_EDGE_BOTH: 265 dual_edge = true; 266 break; 267 268 case IRQ_TYPE_LEVEL_HIGH: 269 level_triggered = true; 270 rising_or_high = true; 271 break; 272 273 case IRQ_TYPE_LEVEL_LOW: 274 level_triggered = true; 275 break; 276 277 default: 278 dev_err(chip->dev, "invalid GPIO IRQ type 0x%x\n", 279 type); 280 return -EINVAL; 281 } 282 283 raw_spin_lock_irqsave(&chip->lock, flags); 284 iproc_set_bit(chip, IPROC_GPIO_INT_TYPE_OFFSET, gpio, 285 level_triggered); 286 iproc_set_bit(chip, IPROC_GPIO_INT_DE_OFFSET, gpio, dual_edge); 287 iproc_set_bit(chip, IPROC_GPIO_INT_EDGE_OFFSET, gpio, 288 rising_or_high); 289 290 if (type & IRQ_TYPE_EDGE_BOTH) 291 irq_set_handler_locked(d, handle_edge_irq); 292 else 293 irq_set_handler_locked(d, handle_level_irq); 294 295 raw_spin_unlock_irqrestore(&chip->lock, flags); 296 297 dev_dbg(chip->dev, 298 "gpio:%u level_triggered:%d dual_edge:%d rising_or_high:%d\n", 299 gpio, level_triggered, dual_edge, rising_or_high); 300 301 return 0; 302 } 303 304 /* 305 * Request the Iproc IOMUX pinmux controller to mux individual pins to GPIO 306 */ 307 static int iproc_gpio_request(struct gpio_chip *gc, unsigned offset) 308 { 309 struct iproc_gpio *chip = gpiochip_get_data(gc); 310 unsigned gpio = gc->base + offset; 311 312 /* not all Iproc GPIO pins can be muxed individually */ 313 if (!chip->pinmux_is_supported) 314 return 0; 315 316 return pinctrl_gpio_request(gpio); 317 } 318 319 static void iproc_gpio_free(struct gpio_chip *gc, unsigned offset) 320 { 321 struct iproc_gpio *chip = gpiochip_get_data(gc); 322 unsigned gpio = gc->base + offset; 323 324 if (!chip->pinmux_is_supported) 325 return; 326 327 pinctrl_gpio_free(gpio); 328 } 329 330 static int iproc_gpio_direction_input(struct gpio_chip *gc, unsigned gpio) 331 { 332 struct iproc_gpio *chip = gpiochip_get_data(gc); 333 unsigned long flags; 334 335 raw_spin_lock_irqsave(&chip->lock, flags); 336 iproc_set_bit(chip, IPROC_GPIO_OUT_EN_OFFSET, gpio, false); 337 raw_spin_unlock_irqrestore(&chip->lock, flags); 338 339 dev_dbg(chip->dev, "gpio:%u set input\n", gpio); 340 341 return 0; 342 } 343 344 static int iproc_gpio_direction_output(struct gpio_chip *gc, unsigned gpio, 345 int val) 346 { 347 struct iproc_gpio *chip = gpiochip_get_data(gc); 348 unsigned long flags; 349 350 raw_spin_lock_irqsave(&chip->lock, flags); 351 iproc_set_bit(chip, IPROC_GPIO_OUT_EN_OFFSET, gpio, true); 352 iproc_set_bit(chip, IPROC_GPIO_DATA_OUT_OFFSET, gpio, !!(val)); 353 raw_spin_unlock_irqrestore(&chip->lock, flags); 354 355 dev_dbg(chip->dev, "gpio:%u set output, value:%d\n", gpio, val); 356 357 return 0; 358 } 359 360 static int iproc_gpio_get_direction(struct gpio_chip *gc, unsigned int gpio) 361 { 362 struct iproc_gpio *chip = gpiochip_get_data(gc); 363 unsigned int offset = IPROC_GPIO_REG(gpio, IPROC_GPIO_OUT_EN_OFFSET); 364 unsigned int shift = IPROC_GPIO_SHIFT(gpio); 365 366 if (readl(chip->base + offset) & BIT(shift)) 367 return GPIO_LINE_DIRECTION_OUT; 368 369 return GPIO_LINE_DIRECTION_IN; 370 } 371 372 static void iproc_gpio_set(struct gpio_chip *gc, unsigned gpio, int val) 373 { 374 struct iproc_gpio *chip = gpiochip_get_data(gc); 375 unsigned long flags; 376 377 raw_spin_lock_irqsave(&chip->lock, flags); 378 iproc_set_bit(chip, IPROC_GPIO_DATA_OUT_OFFSET, gpio, !!(val)); 379 raw_spin_unlock_irqrestore(&chip->lock, flags); 380 381 dev_dbg(chip->dev, "gpio:%u set, value:%d\n", gpio, val); 382 } 383 384 static int iproc_gpio_get(struct gpio_chip *gc, unsigned gpio) 385 { 386 struct iproc_gpio *chip = gpiochip_get_data(gc); 387 unsigned int offset = IPROC_GPIO_REG(gpio, 388 IPROC_GPIO_DATA_IN_OFFSET); 389 unsigned int shift = IPROC_GPIO_SHIFT(gpio); 390 391 return !!(readl(chip->base + offset) & BIT(shift)); 392 } 393 394 /* 395 * Mapping of the iProc PINCONF parameters to the generic pin configuration 396 * parameters 397 */ 398 static const enum pin_config_param iproc_pinconf_disable_map[] = { 399 [IPROC_PINCONF_DRIVE_STRENGTH] = PIN_CONFIG_DRIVE_STRENGTH, 400 [IPROC_PINCONF_BIAS_DISABLE] = PIN_CONFIG_BIAS_DISABLE, 401 [IPROC_PINCONF_BIAS_PULL_UP] = PIN_CONFIG_BIAS_PULL_UP, 402 [IPROC_PINCONF_BIAS_PULL_DOWN] = PIN_CONFIG_BIAS_PULL_DOWN, 403 }; 404 405 static bool iproc_pinconf_param_is_disabled(struct iproc_gpio *chip, 406 enum pin_config_param param) 407 { 408 unsigned int i; 409 410 if (!chip->nr_pinconf_disable) 411 return false; 412 413 for (i = 0; i < chip->nr_pinconf_disable; i++) 414 if (chip->pinconf_disable[i] == param) 415 return true; 416 417 return false; 418 } 419 420 static int iproc_pinconf_disable_map_create(struct iproc_gpio *chip, 421 unsigned long disable_mask) 422 { 423 unsigned int map_size = ARRAY_SIZE(iproc_pinconf_disable_map); 424 unsigned int bit, nbits = 0; 425 426 /* figure out total number of PINCONF parameters to disable */ 427 for_each_set_bit(bit, &disable_mask, map_size) 428 nbits++; 429 430 if (!nbits) 431 return 0; 432 433 /* 434 * Allocate an array to store PINCONF parameters that need to be 435 * disabled 436 */ 437 chip->pinconf_disable = devm_kcalloc(chip->dev, nbits, 438 sizeof(*chip->pinconf_disable), 439 GFP_KERNEL); 440 if (!chip->pinconf_disable) 441 return -ENOMEM; 442 443 chip->nr_pinconf_disable = nbits; 444 445 /* now store these parameters */ 446 nbits = 0; 447 for_each_set_bit(bit, &disable_mask, map_size) 448 chip->pinconf_disable[nbits++] = iproc_pinconf_disable_map[bit]; 449 450 return 0; 451 } 452 453 static int iproc_get_groups_count(struct pinctrl_dev *pctldev) 454 { 455 return 1; 456 } 457 458 /* 459 * Only one group: "gpio_grp", since this local pinctrl device only performs 460 * GPIO specific PINCONF configurations 461 */ 462 static const char *iproc_get_group_name(struct pinctrl_dev *pctldev, 463 unsigned selector) 464 { 465 return "gpio_grp"; 466 } 467 468 static const struct pinctrl_ops iproc_pctrl_ops = { 469 .get_groups_count = iproc_get_groups_count, 470 .get_group_name = iproc_get_group_name, 471 .dt_node_to_map = pinconf_generic_dt_node_to_map_pin, 472 .dt_free_map = pinctrl_utils_free_map, 473 }; 474 475 static int iproc_gpio_set_pull(struct iproc_gpio *chip, unsigned gpio, 476 bool disable, bool pull_up) 477 { 478 void __iomem *base; 479 unsigned long flags; 480 unsigned int shift; 481 u32 val_1, val_2; 482 483 raw_spin_lock_irqsave(&chip->lock, flags); 484 if (chip->io_ctrl_type == IOCTRL_TYPE_CDRU) { 485 base = chip->io_ctrl; 486 shift = IPROC_GPIO_SHIFT(gpio); 487 488 val_1 = readl(base + IPROC_GPIO_PULL_UP_OFFSET); 489 val_2 = readl(base + IPROC_GPIO_PULL_DN_OFFSET); 490 if (disable) { 491 /* no pull-up or pull-down */ 492 val_1 &= ~BIT(shift); 493 val_2 &= ~BIT(shift); 494 } else if (pull_up) { 495 val_1 |= BIT(shift); 496 val_2 &= ~BIT(shift); 497 } else { 498 val_1 &= ~BIT(shift); 499 val_2 |= BIT(shift); 500 } 501 writel(val_1, base + IPROC_GPIO_PULL_UP_OFFSET); 502 writel(val_2, base + IPROC_GPIO_PULL_DN_OFFSET); 503 } else { 504 if (disable) { 505 iproc_set_bit(chip, IPROC_GPIO_RES_EN_OFFSET, gpio, 506 false); 507 } else { 508 iproc_set_bit(chip, IPROC_GPIO_PAD_RES_OFFSET, gpio, 509 pull_up); 510 iproc_set_bit(chip, IPROC_GPIO_RES_EN_OFFSET, gpio, 511 true); 512 } 513 } 514 515 raw_spin_unlock_irqrestore(&chip->lock, flags); 516 dev_dbg(chip->dev, "gpio:%u set pullup:%d\n", gpio, pull_up); 517 518 return 0; 519 } 520 521 static void iproc_gpio_get_pull(struct iproc_gpio *chip, unsigned gpio, 522 bool *disable, bool *pull_up) 523 { 524 void __iomem *base; 525 unsigned long flags; 526 unsigned int shift; 527 u32 val_1, val_2; 528 529 raw_spin_lock_irqsave(&chip->lock, flags); 530 if (chip->io_ctrl_type == IOCTRL_TYPE_CDRU) { 531 base = chip->io_ctrl; 532 shift = IPROC_GPIO_SHIFT(gpio); 533 534 val_1 = readl(base + IPROC_GPIO_PULL_UP_OFFSET) & BIT(shift); 535 val_2 = readl(base + IPROC_GPIO_PULL_DN_OFFSET) & BIT(shift); 536 537 *pull_up = val_1 ? true : false; 538 *disable = (val_1 | val_2) ? false : true; 539 540 } else { 541 *disable = !iproc_get_bit(chip, IPROC_GPIO_RES_EN_OFFSET, gpio); 542 *pull_up = iproc_get_bit(chip, IPROC_GPIO_PAD_RES_OFFSET, gpio); 543 } 544 raw_spin_unlock_irqrestore(&chip->lock, flags); 545 } 546 547 #define DRV_STRENGTH_OFFSET(gpio, bit, type) ((type) == IOCTRL_TYPE_AON ? \ 548 ((2 - (bit)) * 4 + IPROC_GPIO_DRV_CTRL_OFFSET) : \ 549 ((type) == IOCTRL_TYPE_CDRU) ? \ 550 ((bit) * 4 + IPROC_GPIO_DRV_CTRL_OFFSET) : \ 551 ((bit) * 4 + IPROC_GPIO_REG(gpio, IPROC_GPIO_ASIU_DRV0_CTRL_OFFSET))) 552 553 static int iproc_gpio_set_strength(struct iproc_gpio *chip, unsigned gpio, 554 unsigned strength) 555 { 556 void __iomem *base; 557 unsigned int i, offset, shift; 558 u32 val; 559 unsigned long flags; 560 561 /* make sure drive strength is supported */ 562 if (strength < 2 || strength > 16 || (strength % 2)) 563 return -ENOTSUPP; 564 565 if (chip->io_ctrl) { 566 base = chip->io_ctrl; 567 } else { 568 base = chip->base; 569 } 570 571 shift = IPROC_GPIO_SHIFT(gpio); 572 573 dev_dbg(chip->dev, "gpio:%u set drive strength:%d mA\n", gpio, 574 strength); 575 576 raw_spin_lock_irqsave(&chip->lock, flags); 577 strength = (strength / 2) - 1; 578 for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) { 579 offset = DRV_STRENGTH_OFFSET(gpio, i, chip->io_ctrl_type); 580 val = readl(base + offset); 581 val &= ~BIT(shift); 582 val |= ((strength >> i) & 0x1) << shift; 583 writel(val, base + offset); 584 } 585 raw_spin_unlock_irqrestore(&chip->lock, flags); 586 587 return 0; 588 } 589 590 static int iproc_gpio_get_strength(struct iproc_gpio *chip, unsigned gpio, 591 u16 *strength) 592 { 593 void __iomem *base; 594 unsigned int i, offset, shift; 595 u32 val; 596 unsigned long flags; 597 598 if (chip->io_ctrl) { 599 base = chip->io_ctrl; 600 } else { 601 base = chip->base; 602 } 603 604 shift = IPROC_GPIO_SHIFT(gpio); 605 606 raw_spin_lock_irqsave(&chip->lock, flags); 607 *strength = 0; 608 for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) { 609 offset = DRV_STRENGTH_OFFSET(gpio, i, chip->io_ctrl_type); 610 val = readl(base + offset) & BIT(shift); 611 val >>= shift; 612 *strength += (val << i); 613 } 614 615 /* convert to mA */ 616 *strength = (*strength + 1) * 2; 617 raw_spin_unlock_irqrestore(&chip->lock, flags); 618 619 return 0; 620 } 621 622 static int iproc_pin_config_get(struct pinctrl_dev *pctldev, unsigned pin, 623 unsigned long *config) 624 { 625 struct iproc_gpio *chip = pinctrl_dev_get_drvdata(pctldev); 626 enum pin_config_param param = pinconf_to_config_param(*config); 627 unsigned gpio = iproc_pin_to_gpio(pin); 628 u16 arg; 629 bool disable, pull_up; 630 int ret; 631 632 if (iproc_pinconf_param_is_disabled(chip, param)) 633 return -ENOTSUPP; 634 635 switch (param) { 636 case PIN_CONFIG_BIAS_DISABLE: 637 iproc_gpio_get_pull(chip, gpio, &disable, &pull_up); 638 if (disable) 639 return 0; 640 else 641 return -EINVAL; 642 643 case PIN_CONFIG_BIAS_PULL_UP: 644 iproc_gpio_get_pull(chip, gpio, &disable, &pull_up); 645 if (!disable && pull_up) 646 return 0; 647 else 648 return -EINVAL; 649 650 case PIN_CONFIG_BIAS_PULL_DOWN: 651 iproc_gpio_get_pull(chip, gpio, &disable, &pull_up); 652 if (!disable && !pull_up) 653 return 0; 654 else 655 return -EINVAL; 656 657 case PIN_CONFIG_DRIVE_STRENGTH: 658 ret = iproc_gpio_get_strength(chip, gpio, &arg); 659 if (ret) 660 return ret; 661 *config = pinconf_to_config_packed(param, arg); 662 663 return 0; 664 665 default: 666 return -ENOTSUPP; 667 } 668 669 return -ENOTSUPP; 670 } 671 672 static int iproc_pin_config_set(struct pinctrl_dev *pctldev, unsigned pin, 673 unsigned long *configs, unsigned num_configs) 674 { 675 struct iproc_gpio *chip = pinctrl_dev_get_drvdata(pctldev); 676 enum pin_config_param param; 677 u32 arg; 678 unsigned i, gpio = iproc_pin_to_gpio(pin); 679 int ret = -ENOTSUPP; 680 681 for (i = 0; i < num_configs; i++) { 682 param = pinconf_to_config_param(configs[i]); 683 684 if (iproc_pinconf_param_is_disabled(chip, param)) 685 return -ENOTSUPP; 686 687 arg = pinconf_to_config_argument(configs[i]); 688 689 switch (param) { 690 case PIN_CONFIG_BIAS_DISABLE: 691 ret = iproc_gpio_set_pull(chip, gpio, true, false); 692 if (ret < 0) 693 goto out; 694 break; 695 696 case PIN_CONFIG_BIAS_PULL_UP: 697 ret = iproc_gpio_set_pull(chip, gpio, false, true); 698 if (ret < 0) 699 goto out; 700 break; 701 702 case PIN_CONFIG_BIAS_PULL_DOWN: 703 ret = iproc_gpio_set_pull(chip, gpio, false, false); 704 if (ret < 0) 705 goto out; 706 break; 707 708 case PIN_CONFIG_DRIVE_STRENGTH: 709 ret = iproc_gpio_set_strength(chip, gpio, arg); 710 if (ret < 0) 711 goto out; 712 break; 713 714 default: 715 dev_err(chip->dev, "invalid configuration\n"); 716 return -ENOTSUPP; 717 } 718 } /* for each config */ 719 720 out: 721 return ret; 722 } 723 724 static const struct pinconf_ops iproc_pconf_ops = { 725 .is_generic = true, 726 .pin_config_get = iproc_pin_config_get, 727 .pin_config_set = iproc_pin_config_set, 728 }; 729 730 /* 731 * Iproc GPIO controller supports some PINCONF related configurations such as 732 * pull up, pull down, and drive strength, when the pin is configured to GPIO 733 * 734 * Here a local pinctrl device is created with simple 1-to-1 pin mapping to the 735 * local GPIO pins 736 */ 737 static int iproc_gpio_register_pinconf(struct iproc_gpio *chip) 738 { 739 struct pinctrl_desc *pctldesc = &chip->pctldesc; 740 struct pinctrl_pin_desc *pins; 741 struct gpio_chip *gc = &chip->gc; 742 int i; 743 744 pins = devm_kcalloc(chip->dev, gc->ngpio, sizeof(*pins), GFP_KERNEL); 745 if (!pins) 746 return -ENOMEM; 747 748 for (i = 0; i < gc->ngpio; i++) { 749 pins[i].number = i; 750 pins[i].name = devm_kasprintf(chip->dev, GFP_KERNEL, 751 "gpio-%d", i); 752 if (!pins[i].name) 753 return -ENOMEM; 754 } 755 756 pctldesc->name = dev_name(chip->dev); 757 pctldesc->pctlops = &iproc_pctrl_ops; 758 pctldesc->pins = pins; 759 pctldesc->npins = gc->ngpio; 760 pctldesc->confops = &iproc_pconf_ops; 761 762 chip->pctl = devm_pinctrl_register(chip->dev, pctldesc, chip); 763 if (IS_ERR(chip->pctl)) { 764 dev_err(chip->dev, "unable to register pinctrl device\n"); 765 return PTR_ERR(chip->pctl); 766 } 767 768 return 0; 769 } 770 771 static const struct of_device_id iproc_gpio_of_match[] = { 772 { .compatible = "brcm,iproc-gpio" }, 773 { .compatible = "brcm,cygnus-ccm-gpio" }, 774 { .compatible = "brcm,cygnus-asiu-gpio" }, 775 { .compatible = "brcm,cygnus-crmu-gpio" }, 776 { .compatible = "brcm,iproc-nsp-gpio" }, 777 { .compatible = "brcm,iproc-stingray-gpio" }, 778 { /* sentinel */ } 779 }; 780 781 static int iproc_gpio_probe(struct platform_device *pdev) 782 { 783 struct device *dev = &pdev->dev; 784 struct resource *res; 785 struct iproc_gpio *chip; 786 struct gpio_chip *gc; 787 u32 ngpios, pinconf_disable_mask = 0; 788 int irq, ret; 789 bool no_pinconf = false; 790 enum iproc_pinconf_ctrl_type io_ctrl_type = IOCTRL_TYPE_INVALID; 791 792 /* NSP does not support drive strength config */ 793 if (of_device_is_compatible(dev->of_node, "brcm,iproc-nsp-gpio")) 794 pinconf_disable_mask = BIT(IPROC_PINCONF_DRIVE_STRENGTH); 795 /* Stingray does not support pinconf in this controller */ 796 else if (of_device_is_compatible(dev->of_node, 797 "brcm,iproc-stingray-gpio")) 798 no_pinconf = true; 799 800 chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL); 801 if (!chip) 802 return -ENOMEM; 803 804 chip->dev = dev; 805 platform_set_drvdata(pdev, chip); 806 807 chip->base = devm_platform_ioremap_resource(pdev, 0); 808 if (IS_ERR(chip->base)) { 809 dev_err(dev, "unable to map I/O memory\n"); 810 return PTR_ERR(chip->base); 811 } 812 813 res = platform_get_resource(pdev, IORESOURCE_MEM, 1); 814 if (res) { 815 chip->io_ctrl = devm_ioremap_resource(dev, res); 816 if (IS_ERR(chip->io_ctrl)) { 817 dev_err(dev, "unable to map I/O memory\n"); 818 return PTR_ERR(chip->io_ctrl); 819 } 820 if (of_device_is_compatible(dev->of_node, 821 "brcm,cygnus-ccm-gpio")) 822 io_ctrl_type = IOCTRL_TYPE_CDRU; 823 else 824 io_ctrl_type = IOCTRL_TYPE_AON; 825 } 826 827 chip->io_ctrl_type = io_ctrl_type; 828 829 if (of_property_read_u32(dev->of_node, "ngpios", &ngpios)) { 830 dev_err(&pdev->dev, "missing ngpios DT property\n"); 831 return -ENODEV; 832 } 833 834 raw_spin_lock_init(&chip->lock); 835 836 gc = &chip->gc; 837 gc->base = -1; 838 gc->ngpio = ngpios; 839 chip->num_banks = (ngpios + NGPIOS_PER_BANK - 1) / NGPIOS_PER_BANK; 840 gc->label = dev_name(dev); 841 gc->parent = dev; 842 gc->of_node = dev->of_node; 843 gc->request = iproc_gpio_request; 844 gc->free = iproc_gpio_free; 845 gc->direction_input = iproc_gpio_direction_input; 846 gc->direction_output = iproc_gpio_direction_output; 847 gc->get_direction = iproc_gpio_get_direction; 848 gc->set = iproc_gpio_set; 849 gc->get = iproc_gpio_get; 850 851 chip->pinmux_is_supported = of_property_read_bool(dev->of_node, 852 "gpio-ranges"); 853 854 /* optional GPIO interrupt support */ 855 irq = platform_get_irq_optional(pdev, 0); 856 if (irq > 0) { 857 struct irq_chip *irqc; 858 struct gpio_irq_chip *girq; 859 860 irqc = &chip->irqchip; 861 irqc->name = dev_name(dev); 862 irqc->irq_ack = iproc_gpio_irq_ack; 863 irqc->irq_mask = iproc_gpio_irq_mask; 864 irqc->irq_unmask = iproc_gpio_irq_unmask; 865 irqc->irq_set_type = iproc_gpio_irq_set_type; 866 irqc->irq_enable = iproc_gpio_irq_unmask; 867 irqc->irq_disable = iproc_gpio_irq_mask; 868 869 girq = &gc->irq; 870 girq->chip = irqc; 871 girq->parent_handler = iproc_gpio_irq_handler; 872 girq->num_parents = 1; 873 girq->parents = devm_kcalloc(dev, 1, 874 sizeof(*girq->parents), 875 GFP_KERNEL); 876 if (!girq->parents) 877 return -ENOMEM; 878 girq->parents[0] = irq; 879 girq->default_type = IRQ_TYPE_NONE; 880 girq->handler = handle_bad_irq; 881 } 882 883 ret = gpiochip_add_data(gc, chip); 884 if (ret < 0) { 885 dev_err(dev, "unable to add GPIO chip\n"); 886 return ret; 887 } 888 889 if (!no_pinconf) { 890 ret = iproc_gpio_register_pinconf(chip); 891 if (ret) { 892 dev_err(dev, "unable to register pinconf\n"); 893 goto err_rm_gpiochip; 894 } 895 896 if (pinconf_disable_mask) { 897 ret = iproc_pinconf_disable_map_create(chip, 898 pinconf_disable_mask); 899 if (ret) { 900 dev_err(dev, 901 "unable to create pinconf disable map\n"); 902 goto err_rm_gpiochip; 903 } 904 } 905 } 906 907 return 0; 908 909 err_rm_gpiochip: 910 gpiochip_remove(gc); 911 912 return ret; 913 } 914 915 static struct platform_driver iproc_gpio_driver = { 916 .driver = { 917 .name = "iproc-gpio", 918 .of_match_table = iproc_gpio_of_match, 919 }, 920 .probe = iproc_gpio_probe, 921 }; 922 923 static int __init iproc_gpio_init(void) 924 { 925 return platform_driver_register(&iproc_gpio_driver); 926 } 927 arch_initcall_sync(iproc_gpio_init); 928