1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * OWL SoC's Pinctrl driver 4 * 5 * Copyright (c) 2014 Actions Semi Inc. 6 * Author: David Liu <liuwei@actions-semi.com> 7 * 8 * Copyright (c) 2018 Linaro Ltd. 9 * Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> 10 */ 11 12 #include <linux/clk.h> 13 #include <linux/err.h> 14 #include <linux/gpio/driver.h> 15 #include <linux/io.h> 16 #include <linux/irq.h> 17 #include <linux/module.h> 18 #include <linux/of.h> 19 #include <linux/platform_device.h> 20 #include <linux/pinctrl/machine.h> 21 #include <linux/pinctrl/pinctrl.h> 22 #include <linux/pinctrl/pinmux.h> 23 #include <linux/pinctrl/pinconf.h> 24 #include <linux/pinctrl/pinconf-generic.h> 25 #include <linux/slab.h> 26 #include <linux/spinlock.h> 27 28 #include "../core.h" 29 #include "../pinctrl-utils.h" 30 #include "pinctrl-owl.h" 31 32 /** 33 * struct owl_pinctrl - pinctrl state of the device 34 * @dev: device handle 35 * @pctrldev: pinctrl handle 36 * @chip: gpio chip 37 * @lock: spinlock to protect registers 38 * @clk: clock control 39 * @soc: reference to soc_data 40 * @base: pinctrl register base address 41 * @irq_chip: IRQ chip information 42 * @num_irq: number of possible interrupts 43 * @irq: interrupt numbers 44 */ 45 struct owl_pinctrl { 46 struct device *dev; 47 struct pinctrl_dev *pctrldev; 48 struct gpio_chip chip; 49 raw_spinlock_t lock; 50 struct clk *clk; 51 const struct owl_pinctrl_soc_data *soc; 52 void __iomem *base; 53 struct irq_chip irq_chip; 54 unsigned int num_irq; 55 unsigned int *irq; 56 }; 57 58 static void owl_update_bits(void __iomem *base, u32 mask, u32 val) 59 { 60 u32 reg_val; 61 62 reg_val = readl_relaxed(base); 63 64 reg_val = (reg_val & ~mask) | (val & mask); 65 66 writel_relaxed(reg_val, base); 67 } 68 69 static u32 owl_read_field(struct owl_pinctrl *pctrl, u32 reg, 70 u32 bit, u32 width) 71 { 72 u32 tmp, mask; 73 74 tmp = readl_relaxed(pctrl->base + reg); 75 mask = (1 << width) - 1; 76 77 return (tmp >> bit) & mask; 78 } 79 80 static void owl_write_field(struct owl_pinctrl *pctrl, u32 reg, u32 arg, 81 u32 bit, u32 width) 82 { 83 u32 mask; 84 85 mask = (1 << width) - 1; 86 mask = mask << bit; 87 88 owl_update_bits(pctrl->base + reg, mask, (arg << bit)); 89 } 90 91 static int owl_get_groups_count(struct pinctrl_dev *pctrldev) 92 { 93 struct owl_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrldev); 94 95 return pctrl->soc->ngroups; 96 } 97 98 static const char *owl_get_group_name(struct pinctrl_dev *pctrldev, 99 unsigned int group) 100 { 101 struct owl_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrldev); 102 103 return pctrl->soc->groups[group].name; 104 } 105 106 static int owl_get_group_pins(struct pinctrl_dev *pctrldev, 107 unsigned int group, 108 const unsigned int **pins, 109 unsigned int *num_pins) 110 { 111 struct owl_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrldev); 112 113 *pins = pctrl->soc->groups[group].pads; 114 *num_pins = pctrl->soc->groups[group].npads; 115 116 return 0; 117 } 118 119 static void owl_pin_dbg_show(struct pinctrl_dev *pctrldev, 120 struct seq_file *s, 121 unsigned int offset) 122 { 123 struct owl_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrldev); 124 125 seq_printf(s, "%s", dev_name(pctrl->dev)); 126 } 127 128 static const struct pinctrl_ops owl_pinctrl_ops = { 129 .get_groups_count = owl_get_groups_count, 130 .get_group_name = owl_get_group_name, 131 .get_group_pins = owl_get_group_pins, 132 .pin_dbg_show = owl_pin_dbg_show, 133 .dt_node_to_map = pinconf_generic_dt_node_to_map_all, 134 .dt_free_map = pinctrl_utils_free_map, 135 }; 136 137 static int owl_get_funcs_count(struct pinctrl_dev *pctrldev) 138 { 139 struct owl_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrldev); 140 141 return pctrl->soc->nfunctions; 142 } 143 144 static const char *owl_get_func_name(struct pinctrl_dev *pctrldev, 145 unsigned int function) 146 { 147 struct owl_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrldev); 148 149 return pctrl->soc->functions[function].name; 150 } 151 152 static int owl_get_func_groups(struct pinctrl_dev *pctrldev, 153 unsigned int function, 154 const char * const **groups, 155 unsigned int * const num_groups) 156 { 157 struct owl_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrldev); 158 159 *groups = pctrl->soc->functions[function].groups; 160 *num_groups = pctrl->soc->functions[function].ngroups; 161 162 return 0; 163 } 164 165 static inline int get_group_mfp_mask_val(const struct owl_pingroup *g, 166 int function, 167 u32 *mask, 168 u32 *val) 169 { 170 int id; 171 u32 option_num; 172 u32 option_mask; 173 174 for (id = 0; id < g->nfuncs; id++) { 175 if (g->funcs[id] == function) 176 break; 177 } 178 if (WARN_ON(id == g->nfuncs)) 179 return -EINVAL; 180 181 option_num = (1 << g->mfpctl_width); 182 if (id > option_num) 183 id -= option_num; 184 185 option_mask = option_num - 1; 186 *mask = (option_mask << g->mfpctl_shift); 187 *val = (id << g->mfpctl_shift); 188 189 return 0; 190 } 191 192 static int owl_set_mux(struct pinctrl_dev *pctrldev, 193 unsigned int function, 194 unsigned int group) 195 { 196 struct owl_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrldev); 197 const struct owl_pingroup *g; 198 unsigned long flags; 199 u32 val, mask; 200 201 g = &pctrl->soc->groups[group]; 202 203 if (get_group_mfp_mask_val(g, function, &mask, &val)) 204 return -EINVAL; 205 206 raw_spin_lock_irqsave(&pctrl->lock, flags); 207 208 owl_update_bits(pctrl->base + g->mfpctl_reg, mask, val); 209 210 raw_spin_unlock_irqrestore(&pctrl->lock, flags); 211 212 return 0; 213 } 214 215 static const struct pinmux_ops owl_pinmux_ops = { 216 .get_functions_count = owl_get_funcs_count, 217 .get_function_name = owl_get_func_name, 218 .get_function_groups = owl_get_func_groups, 219 .set_mux = owl_set_mux, 220 }; 221 222 static int owl_pad_pinconf_reg(const struct owl_padinfo *info, 223 unsigned int param, 224 u32 *reg, 225 u32 *bit, 226 u32 *width) 227 { 228 switch (param) { 229 case PIN_CONFIG_BIAS_BUS_HOLD: 230 case PIN_CONFIG_BIAS_HIGH_IMPEDANCE: 231 case PIN_CONFIG_BIAS_PULL_DOWN: 232 case PIN_CONFIG_BIAS_PULL_UP: 233 if (!info->pullctl) 234 return -EINVAL; 235 *reg = info->pullctl->reg; 236 *bit = info->pullctl->shift; 237 *width = info->pullctl->width; 238 break; 239 case PIN_CONFIG_INPUT_SCHMITT_ENABLE: 240 if (!info->st) 241 return -EINVAL; 242 *reg = info->st->reg; 243 *bit = info->st->shift; 244 *width = info->st->width; 245 break; 246 default: 247 return -ENOTSUPP; 248 } 249 250 return 0; 251 } 252 253 static int owl_pin_config_get(struct pinctrl_dev *pctrldev, 254 unsigned int pin, 255 unsigned long *config) 256 { 257 int ret = 0; 258 struct owl_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrldev); 259 const struct owl_padinfo *info; 260 unsigned int param = pinconf_to_config_param(*config); 261 u32 reg, bit, width, arg; 262 263 info = &pctrl->soc->padinfo[pin]; 264 265 ret = owl_pad_pinconf_reg(info, param, ®, &bit, &width); 266 if (ret) 267 return ret; 268 269 arg = owl_read_field(pctrl, reg, bit, width); 270 271 if (!pctrl->soc->padctl_val2arg) 272 return -ENOTSUPP; 273 274 ret = pctrl->soc->padctl_val2arg(info, param, &arg); 275 if (ret) 276 return ret; 277 278 *config = pinconf_to_config_packed(param, arg); 279 280 return ret; 281 } 282 283 static int owl_pin_config_set(struct pinctrl_dev *pctrldev, 284 unsigned int pin, 285 unsigned long *configs, 286 unsigned int num_configs) 287 { 288 struct owl_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrldev); 289 const struct owl_padinfo *info; 290 unsigned long flags; 291 unsigned int param; 292 u32 reg, bit, width, arg; 293 int ret = 0, i; 294 295 info = &pctrl->soc->padinfo[pin]; 296 297 for (i = 0; i < num_configs; i++) { 298 param = pinconf_to_config_param(configs[i]); 299 arg = pinconf_to_config_argument(configs[i]); 300 301 ret = owl_pad_pinconf_reg(info, param, ®, &bit, &width); 302 if (ret) 303 return ret; 304 305 if (!pctrl->soc->padctl_arg2val) 306 return -ENOTSUPP; 307 308 ret = pctrl->soc->padctl_arg2val(info, param, &arg); 309 if (ret) 310 return ret; 311 312 raw_spin_lock_irqsave(&pctrl->lock, flags); 313 314 owl_write_field(pctrl, reg, arg, bit, width); 315 316 raw_spin_unlock_irqrestore(&pctrl->lock, flags); 317 } 318 319 return ret; 320 } 321 322 static int owl_group_pinconf_reg(const struct owl_pingroup *g, 323 unsigned int param, 324 u32 *reg, 325 u32 *bit, 326 u32 *width) 327 { 328 switch (param) { 329 case PIN_CONFIG_DRIVE_STRENGTH: 330 if (g->drv_reg < 0) 331 return -EINVAL; 332 *reg = g->drv_reg; 333 *bit = g->drv_shift; 334 *width = g->drv_width; 335 break; 336 case PIN_CONFIG_SLEW_RATE: 337 if (g->sr_reg < 0) 338 return -EINVAL; 339 *reg = g->sr_reg; 340 *bit = g->sr_shift; 341 *width = g->sr_width; 342 break; 343 default: 344 return -ENOTSUPP; 345 } 346 347 return 0; 348 } 349 350 static int owl_group_pinconf_arg2val(const struct owl_pingroup *g, 351 unsigned int param, 352 u32 *arg) 353 { 354 switch (param) { 355 case PIN_CONFIG_DRIVE_STRENGTH: 356 switch (*arg) { 357 case 2: 358 *arg = OWL_PINCONF_DRV_2MA; 359 break; 360 case 4: 361 *arg = OWL_PINCONF_DRV_4MA; 362 break; 363 case 8: 364 *arg = OWL_PINCONF_DRV_8MA; 365 break; 366 case 12: 367 *arg = OWL_PINCONF_DRV_12MA; 368 break; 369 default: 370 return -EINVAL; 371 } 372 break; 373 case PIN_CONFIG_SLEW_RATE: 374 if (*arg) 375 *arg = OWL_PINCONF_SLEW_FAST; 376 else 377 *arg = OWL_PINCONF_SLEW_SLOW; 378 break; 379 default: 380 return -ENOTSUPP; 381 } 382 383 return 0; 384 } 385 386 static int owl_group_pinconf_val2arg(const struct owl_pingroup *g, 387 unsigned int param, 388 u32 *arg) 389 { 390 switch (param) { 391 case PIN_CONFIG_DRIVE_STRENGTH: 392 switch (*arg) { 393 case OWL_PINCONF_DRV_2MA: 394 *arg = 2; 395 break; 396 case OWL_PINCONF_DRV_4MA: 397 *arg = 4; 398 break; 399 case OWL_PINCONF_DRV_8MA: 400 *arg = 8; 401 break; 402 case OWL_PINCONF_DRV_12MA: 403 *arg = 12; 404 break; 405 default: 406 return -EINVAL; 407 } 408 break; 409 case PIN_CONFIG_SLEW_RATE: 410 if (*arg) 411 *arg = 1; 412 else 413 *arg = 0; 414 break; 415 default: 416 return -ENOTSUPP; 417 } 418 419 return 0; 420 } 421 422 static int owl_group_config_get(struct pinctrl_dev *pctrldev, 423 unsigned int group, 424 unsigned long *config) 425 { 426 const struct owl_pingroup *g; 427 struct owl_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrldev); 428 unsigned int param = pinconf_to_config_param(*config); 429 u32 reg, bit, width, arg; 430 int ret; 431 432 g = &pctrl->soc->groups[group]; 433 434 ret = owl_group_pinconf_reg(g, param, ®, &bit, &width); 435 if (ret) 436 return ret; 437 438 arg = owl_read_field(pctrl, reg, bit, width); 439 440 ret = owl_group_pinconf_val2arg(g, param, &arg); 441 if (ret) 442 return ret; 443 444 *config = pinconf_to_config_packed(param, arg); 445 446 return ret; 447 } 448 449 static int owl_group_config_set(struct pinctrl_dev *pctrldev, 450 unsigned int group, 451 unsigned long *configs, 452 unsigned int num_configs) 453 { 454 const struct owl_pingroup *g; 455 struct owl_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrldev); 456 unsigned long flags; 457 unsigned int param; 458 u32 reg, bit, width, arg; 459 int ret, i; 460 461 g = &pctrl->soc->groups[group]; 462 463 for (i = 0; i < num_configs; i++) { 464 param = pinconf_to_config_param(configs[i]); 465 arg = pinconf_to_config_argument(configs[i]); 466 467 ret = owl_group_pinconf_reg(g, param, ®, &bit, &width); 468 if (ret) 469 return ret; 470 471 ret = owl_group_pinconf_arg2val(g, param, &arg); 472 if (ret) 473 return ret; 474 475 /* Update register */ 476 raw_spin_lock_irqsave(&pctrl->lock, flags); 477 478 owl_write_field(pctrl, reg, arg, bit, width); 479 480 raw_spin_unlock_irqrestore(&pctrl->lock, flags); 481 } 482 483 return 0; 484 } 485 486 static const struct pinconf_ops owl_pinconf_ops = { 487 .is_generic = true, 488 .pin_config_get = owl_pin_config_get, 489 .pin_config_set = owl_pin_config_set, 490 .pin_config_group_get = owl_group_config_get, 491 .pin_config_group_set = owl_group_config_set, 492 }; 493 494 static struct pinctrl_desc owl_pinctrl_desc = { 495 .pctlops = &owl_pinctrl_ops, 496 .pmxops = &owl_pinmux_ops, 497 .confops = &owl_pinconf_ops, 498 .owner = THIS_MODULE, 499 }; 500 501 static const struct owl_gpio_port * 502 owl_gpio_get_port(struct owl_pinctrl *pctrl, unsigned int *pin) 503 { 504 unsigned int start = 0, i; 505 506 for (i = 0; i < pctrl->soc->nports; i++) { 507 const struct owl_gpio_port *port = &pctrl->soc->ports[i]; 508 509 if (*pin >= start && *pin < start + port->pins) { 510 *pin -= start; 511 return port; 512 } 513 514 start += port->pins; 515 } 516 517 return NULL; 518 } 519 520 static void owl_gpio_update_reg(void __iomem *base, unsigned int pin, int flag) 521 { 522 u32 val; 523 524 val = readl_relaxed(base); 525 526 if (flag) 527 val |= BIT(pin); 528 else 529 val &= ~BIT(pin); 530 531 writel_relaxed(val, base); 532 } 533 534 static int owl_gpio_request(struct gpio_chip *chip, unsigned int offset) 535 { 536 struct owl_pinctrl *pctrl = gpiochip_get_data(chip); 537 const struct owl_gpio_port *port; 538 void __iomem *gpio_base; 539 unsigned long flags; 540 541 port = owl_gpio_get_port(pctrl, &offset); 542 if (WARN_ON(port == NULL)) 543 return -ENODEV; 544 545 gpio_base = pctrl->base + port->offset; 546 547 /* 548 * GPIOs have higher priority over other modules, so either setting 549 * them as OUT or IN is sufficient 550 */ 551 raw_spin_lock_irqsave(&pctrl->lock, flags); 552 owl_gpio_update_reg(gpio_base + port->outen, offset, true); 553 raw_spin_unlock_irqrestore(&pctrl->lock, flags); 554 555 return 0; 556 } 557 558 static void owl_gpio_free(struct gpio_chip *chip, unsigned int offset) 559 { 560 struct owl_pinctrl *pctrl = gpiochip_get_data(chip); 561 const struct owl_gpio_port *port; 562 void __iomem *gpio_base; 563 unsigned long flags; 564 565 port = owl_gpio_get_port(pctrl, &offset); 566 if (WARN_ON(port == NULL)) 567 return; 568 569 gpio_base = pctrl->base + port->offset; 570 571 raw_spin_lock_irqsave(&pctrl->lock, flags); 572 /* disable gpio output */ 573 owl_gpio_update_reg(gpio_base + port->outen, offset, false); 574 575 /* disable gpio input */ 576 owl_gpio_update_reg(gpio_base + port->inen, offset, false); 577 raw_spin_unlock_irqrestore(&pctrl->lock, flags); 578 } 579 580 static int owl_gpio_get(struct gpio_chip *chip, unsigned int offset) 581 { 582 struct owl_pinctrl *pctrl = gpiochip_get_data(chip); 583 const struct owl_gpio_port *port; 584 void __iomem *gpio_base; 585 unsigned long flags; 586 u32 val; 587 588 port = owl_gpio_get_port(pctrl, &offset); 589 if (WARN_ON(port == NULL)) 590 return -ENODEV; 591 592 gpio_base = pctrl->base + port->offset; 593 594 raw_spin_lock_irqsave(&pctrl->lock, flags); 595 val = readl_relaxed(gpio_base + port->dat); 596 raw_spin_unlock_irqrestore(&pctrl->lock, flags); 597 598 return !!(val & BIT(offset)); 599 } 600 601 static void owl_gpio_set(struct gpio_chip *chip, unsigned int offset, int value) 602 { 603 struct owl_pinctrl *pctrl = gpiochip_get_data(chip); 604 const struct owl_gpio_port *port; 605 void __iomem *gpio_base; 606 unsigned long flags; 607 608 port = owl_gpio_get_port(pctrl, &offset); 609 if (WARN_ON(port == NULL)) 610 return; 611 612 gpio_base = pctrl->base + port->offset; 613 614 raw_spin_lock_irqsave(&pctrl->lock, flags); 615 owl_gpio_update_reg(gpio_base + port->dat, offset, value); 616 raw_spin_unlock_irqrestore(&pctrl->lock, flags); 617 } 618 619 static int owl_gpio_direction_input(struct gpio_chip *chip, unsigned int offset) 620 { 621 struct owl_pinctrl *pctrl = gpiochip_get_data(chip); 622 const struct owl_gpio_port *port; 623 void __iomem *gpio_base; 624 unsigned long flags; 625 626 port = owl_gpio_get_port(pctrl, &offset); 627 if (WARN_ON(port == NULL)) 628 return -ENODEV; 629 630 gpio_base = pctrl->base + port->offset; 631 632 raw_spin_lock_irqsave(&pctrl->lock, flags); 633 owl_gpio_update_reg(gpio_base + port->outen, offset, false); 634 owl_gpio_update_reg(gpio_base + port->inen, offset, true); 635 raw_spin_unlock_irqrestore(&pctrl->lock, flags); 636 637 return 0; 638 } 639 640 static int owl_gpio_direction_output(struct gpio_chip *chip, 641 unsigned int offset, int value) 642 { 643 struct owl_pinctrl *pctrl = gpiochip_get_data(chip); 644 const struct owl_gpio_port *port; 645 void __iomem *gpio_base; 646 unsigned long flags; 647 648 port = owl_gpio_get_port(pctrl, &offset); 649 if (WARN_ON(port == NULL)) 650 return -ENODEV; 651 652 gpio_base = pctrl->base + port->offset; 653 654 raw_spin_lock_irqsave(&pctrl->lock, flags); 655 owl_gpio_update_reg(gpio_base + port->inen, offset, false); 656 owl_gpio_update_reg(gpio_base + port->outen, offset, true); 657 owl_gpio_update_reg(gpio_base + port->dat, offset, value); 658 raw_spin_unlock_irqrestore(&pctrl->lock, flags); 659 660 return 0; 661 } 662 663 static void irq_set_type(struct owl_pinctrl *pctrl, int gpio, unsigned int type) 664 { 665 const struct owl_gpio_port *port; 666 void __iomem *gpio_base; 667 unsigned long flags; 668 unsigned int offset, value, irq_type = 0; 669 670 switch (type) { 671 case IRQ_TYPE_EDGE_BOTH: 672 /* 673 * Since the hardware doesn't support interrupts on both edges, 674 * emulate it in the software by setting the single edge 675 * interrupt and switching to the opposite edge while ACKing 676 * the interrupt 677 */ 678 if (owl_gpio_get(&pctrl->chip, gpio)) 679 irq_type = OWL_GPIO_INT_EDGE_FALLING; 680 else 681 irq_type = OWL_GPIO_INT_EDGE_RISING; 682 break; 683 684 case IRQ_TYPE_EDGE_RISING: 685 irq_type = OWL_GPIO_INT_EDGE_RISING; 686 break; 687 688 case IRQ_TYPE_EDGE_FALLING: 689 irq_type = OWL_GPIO_INT_EDGE_FALLING; 690 break; 691 692 case IRQ_TYPE_LEVEL_HIGH: 693 irq_type = OWL_GPIO_INT_LEVEL_HIGH; 694 break; 695 696 case IRQ_TYPE_LEVEL_LOW: 697 irq_type = OWL_GPIO_INT_LEVEL_LOW; 698 break; 699 700 default: 701 break; 702 } 703 704 port = owl_gpio_get_port(pctrl, &gpio); 705 if (WARN_ON(port == NULL)) 706 return; 707 708 gpio_base = pctrl->base + port->offset; 709 710 raw_spin_lock_irqsave(&pctrl->lock, flags); 711 712 offset = (gpio < 16) ? 4 : 0; 713 value = readl_relaxed(gpio_base + port->intc_type + offset); 714 value &= ~(OWL_GPIO_INT_MASK << ((gpio % 16) * 2)); 715 value |= irq_type << ((gpio % 16) * 2); 716 writel_relaxed(value, gpio_base + port->intc_type + offset); 717 718 raw_spin_unlock_irqrestore(&pctrl->lock, flags); 719 } 720 721 static void owl_gpio_irq_mask(struct irq_data *data) 722 { 723 struct gpio_chip *gc = irq_data_get_irq_chip_data(data); 724 struct owl_pinctrl *pctrl = gpiochip_get_data(gc); 725 const struct owl_gpio_port *port; 726 void __iomem *gpio_base; 727 unsigned long flags; 728 unsigned int gpio = data->hwirq; 729 u32 val; 730 731 port = owl_gpio_get_port(pctrl, &gpio); 732 if (WARN_ON(port == NULL)) 733 return; 734 735 gpio_base = pctrl->base + port->offset; 736 737 raw_spin_lock_irqsave(&pctrl->lock, flags); 738 739 owl_gpio_update_reg(gpio_base + port->intc_msk, gpio, false); 740 741 /* disable port interrupt if no interrupt pending bit is active */ 742 val = readl_relaxed(gpio_base + port->intc_msk); 743 if (val == 0) 744 owl_gpio_update_reg(gpio_base + port->intc_ctl, 745 OWL_GPIO_CTLR_ENABLE + port->shared_ctl_offset * 5, false); 746 747 raw_spin_unlock_irqrestore(&pctrl->lock, flags); 748 } 749 750 static void owl_gpio_irq_unmask(struct irq_data *data) 751 { 752 struct gpio_chip *gc = irq_data_get_irq_chip_data(data); 753 struct owl_pinctrl *pctrl = gpiochip_get_data(gc); 754 const struct owl_gpio_port *port; 755 void __iomem *gpio_base; 756 unsigned long flags; 757 unsigned int gpio = data->hwirq; 758 u32 value; 759 760 port = owl_gpio_get_port(pctrl, &gpio); 761 if (WARN_ON(port == NULL)) 762 return; 763 764 gpio_base = pctrl->base + port->offset; 765 raw_spin_lock_irqsave(&pctrl->lock, flags); 766 767 /* enable port interrupt */ 768 value = readl_relaxed(gpio_base + port->intc_ctl); 769 value |= ((BIT(OWL_GPIO_CTLR_ENABLE) | BIT(OWL_GPIO_CTLR_SAMPLE_CLK_24M)) 770 << port->shared_ctl_offset * 5); 771 writel_relaxed(value, gpio_base + port->intc_ctl); 772 773 /* enable GPIO interrupt */ 774 owl_gpio_update_reg(gpio_base + port->intc_msk, gpio, true); 775 776 raw_spin_unlock_irqrestore(&pctrl->lock, flags); 777 } 778 779 static void owl_gpio_irq_ack(struct irq_data *data) 780 { 781 struct gpio_chip *gc = irq_data_get_irq_chip_data(data); 782 struct owl_pinctrl *pctrl = gpiochip_get_data(gc); 783 const struct owl_gpio_port *port; 784 void __iomem *gpio_base; 785 unsigned long flags; 786 unsigned int gpio = data->hwirq; 787 788 /* 789 * Switch the interrupt edge to the opposite edge of the interrupt 790 * which got triggered for the case of emulating both edges 791 */ 792 if (irqd_get_trigger_type(data) == IRQ_TYPE_EDGE_BOTH) { 793 if (owl_gpio_get(gc, gpio)) 794 irq_set_type(pctrl, gpio, IRQ_TYPE_EDGE_FALLING); 795 else 796 irq_set_type(pctrl, gpio, IRQ_TYPE_EDGE_RISING); 797 } 798 799 port = owl_gpio_get_port(pctrl, &gpio); 800 if (WARN_ON(port == NULL)) 801 return; 802 803 gpio_base = pctrl->base + port->offset; 804 805 raw_spin_lock_irqsave(&pctrl->lock, flags); 806 807 owl_gpio_update_reg(gpio_base + port->intc_ctl, 808 OWL_GPIO_CTLR_PENDING + port->shared_ctl_offset * 5, true); 809 810 raw_spin_unlock_irqrestore(&pctrl->lock, flags); 811 } 812 813 static int owl_gpio_irq_set_type(struct irq_data *data, unsigned int type) 814 { 815 struct gpio_chip *gc = irq_data_get_irq_chip_data(data); 816 struct owl_pinctrl *pctrl = gpiochip_get_data(gc); 817 818 if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH)) 819 irq_set_handler_locked(data, handle_level_irq); 820 else 821 irq_set_handler_locked(data, handle_edge_irq); 822 823 irq_set_type(pctrl, data->hwirq, type); 824 825 return 0; 826 } 827 828 static void owl_gpio_irq_handler(struct irq_desc *desc) 829 { 830 struct owl_pinctrl *pctrl = irq_desc_get_handler_data(desc); 831 struct irq_chip *chip = irq_desc_get_chip(desc); 832 struct irq_domain *domain = pctrl->chip.irq.domain; 833 unsigned int parent = irq_desc_get_irq(desc); 834 const struct owl_gpio_port *port; 835 void __iomem *base; 836 unsigned int pin, offset = 0, i; 837 unsigned long pending_irq; 838 839 chained_irq_enter(chip, desc); 840 841 for (i = 0; i < pctrl->soc->nports; i++) { 842 port = &pctrl->soc->ports[i]; 843 base = pctrl->base + port->offset; 844 845 /* skip ports that are not associated with this irq */ 846 if (parent != pctrl->irq[i]) 847 goto skip; 848 849 pending_irq = readl_relaxed(base + port->intc_pd); 850 851 for_each_set_bit(pin, &pending_irq, port->pins) { 852 generic_handle_domain_irq(domain, offset + pin); 853 854 /* clear pending interrupt */ 855 owl_gpio_update_reg(base + port->intc_pd, pin, true); 856 } 857 858 skip: 859 offset += port->pins; 860 } 861 862 chained_irq_exit(chip, desc); 863 } 864 865 static int owl_gpio_init(struct owl_pinctrl *pctrl) 866 { 867 struct gpio_chip *chip; 868 struct gpio_irq_chip *gpio_irq; 869 int ret, i, j, offset; 870 871 chip = &pctrl->chip; 872 chip->base = -1; 873 chip->ngpio = pctrl->soc->ngpios; 874 chip->label = dev_name(pctrl->dev); 875 chip->parent = pctrl->dev; 876 chip->owner = THIS_MODULE; 877 878 pctrl->irq_chip.name = chip->of_node->name; 879 pctrl->irq_chip.irq_ack = owl_gpio_irq_ack; 880 pctrl->irq_chip.irq_mask = owl_gpio_irq_mask; 881 pctrl->irq_chip.irq_unmask = owl_gpio_irq_unmask; 882 pctrl->irq_chip.irq_set_type = owl_gpio_irq_set_type; 883 884 gpio_irq = &chip->irq; 885 gpio_irq->chip = &pctrl->irq_chip; 886 gpio_irq->handler = handle_simple_irq; 887 gpio_irq->default_type = IRQ_TYPE_NONE; 888 gpio_irq->parent_handler = owl_gpio_irq_handler; 889 gpio_irq->parent_handler_data = pctrl; 890 gpio_irq->num_parents = pctrl->num_irq; 891 gpio_irq->parents = pctrl->irq; 892 893 gpio_irq->map = devm_kcalloc(pctrl->dev, chip->ngpio, 894 sizeof(*gpio_irq->map), GFP_KERNEL); 895 if (!gpio_irq->map) 896 return -ENOMEM; 897 898 for (i = 0, offset = 0; i < pctrl->soc->nports; i++) { 899 const struct owl_gpio_port *port = &pctrl->soc->ports[i]; 900 901 for (j = 0; j < port->pins; j++) 902 gpio_irq->map[offset + j] = gpio_irq->parents[i]; 903 904 offset += port->pins; 905 } 906 907 ret = gpiochip_add_data(&pctrl->chip, pctrl); 908 if (ret) { 909 dev_err(pctrl->dev, "failed to register gpiochip\n"); 910 return ret; 911 } 912 913 return 0; 914 } 915 916 int owl_pinctrl_probe(struct platform_device *pdev, 917 struct owl_pinctrl_soc_data *soc_data) 918 { 919 struct owl_pinctrl *pctrl; 920 int ret, i; 921 922 pctrl = devm_kzalloc(&pdev->dev, sizeof(*pctrl), GFP_KERNEL); 923 if (!pctrl) 924 return -ENOMEM; 925 926 pctrl->base = devm_platform_ioremap_resource(pdev, 0); 927 if (IS_ERR(pctrl->base)) 928 return PTR_ERR(pctrl->base); 929 930 /* enable GPIO/MFP clock */ 931 pctrl->clk = devm_clk_get(&pdev->dev, NULL); 932 if (IS_ERR(pctrl->clk)) { 933 dev_err(&pdev->dev, "no clock defined\n"); 934 return PTR_ERR(pctrl->clk); 935 } 936 937 ret = clk_prepare_enable(pctrl->clk); 938 if (ret) { 939 dev_err(&pdev->dev, "clk enable failed\n"); 940 return ret; 941 } 942 943 raw_spin_lock_init(&pctrl->lock); 944 945 owl_pinctrl_desc.name = dev_name(&pdev->dev); 946 owl_pinctrl_desc.pins = soc_data->pins; 947 owl_pinctrl_desc.npins = soc_data->npins; 948 949 pctrl->chip.direction_input = owl_gpio_direction_input; 950 pctrl->chip.direction_output = owl_gpio_direction_output; 951 pctrl->chip.get = owl_gpio_get; 952 pctrl->chip.set = owl_gpio_set; 953 pctrl->chip.request = owl_gpio_request; 954 pctrl->chip.free = owl_gpio_free; 955 956 pctrl->soc = soc_data; 957 pctrl->dev = &pdev->dev; 958 959 pctrl->pctrldev = devm_pinctrl_register(&pdev->dev, 960 &owl_pinctrl_desc, pctrl); 961 if (IS_ERR(pctrl->pctrldev)) { 962 dev_err(&pdev->dev, "could not register Actions OWL pinmux driver\n"); 963 ret = PTR_ERR(pctrl->pctrldev); 964 goto err_exit; 965 } 966 967 ret = platform_irq_count(pdev); 968 if (ret < 0) 969 goto err_exit; 970 971 pctrl->num_irq = ret; 972 973 pctrl->irq = devm_kcalloc(&pdev->dev, pctrl->num_irq, 974 sizeof(*pctrl->irq), GFP_KERNEL); 975 if (!pctrl->irq) { 976 ret = -ENOMEM; 977 goto err_exit; 978 } 979 980 for (i = 0; i < pctrl->num_irq ; i++) { 981 ret = platform_get_irq(pdev, i); 982 if (ret < 0) 983 goto err_exit; 984 pctrl->irq[i] = ret; 985 } 986 987 ret = owl_gpio_init(pctrl); 988 if (ret) 989 goto err_exit; 990 991 platform_set_drvdata(pdev, pctrl); 992 993 return 0; 994 995 err_exit: 996 clk_disable_unprepare(pctrl->clk); 997 998 return ret; 999 } 1000