1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Driver for the Atmel PIO4 controller 4 * 5 * Copyright (C) 2015 Atmel, 6 * 2015 Ludovic Desroches <ludovic.desroches@atmel.com> 7 */ 8 9 #include <dt-bindings/pinctrl/at91.h> 10 #include <linux/clk.h> 11 #include <linux/gpio/driver.h> 12 #include <linux/interrupt.h> 13 #include <linux/io.h> 14 #include <linux/init.h> 15 #include <linux/of.h> 16 #include <linux/platform_device.h> 17 #include <linux/pinctrl/pinconf.h> 18 #include <linux/pinctrl/pinconf-generic.h> 19 #include <linux/pinctrl/pinctrl.h> 20 #include <linux/pinctrl/pinmux.h> 21 #include <linux/slab.h> 22 #include "core.h" 23 #include "pinconf.h" 24 #include "pinctrl-utils.h" 25 26 /* 27 * Warning: 28 * In order to not introduce confusion between Atmel PIO groups and pinctrl 29 * framework groups, Atmel PIO groups will be called banks, line is kept to 30 * designed the pin id into this bank. 31 */ 32 33 #define ATMEL_PIO_MSKR 0x0000 34 #define ATMEL_PIO_CFGR 0x0004 35 #define ATMEL_PIO_CFGR_FUNC_MASK GENMASK(2, 0) 36 #define ATMEL_PIO_DIR_MASK BIT(8) 37 #define ATMEL_PIO_PUEN_MASK BIT(9) 38 #define ATMEL_PIO_PDEN_MASK BIT(10) 39 #define ATMEL_PIO_IFEN_MASK BIT(12) 40 #define ATMEL_PIO_IFSCEN_MASK BIT(13) 41 #define ATMEL_PIO_OPD_MASK BIT(14) 42 #define ATMEL_PIO_SCHMITT_MASK BIT(15) 43 #define ATMEL_PIO_DRVSTR_MASK GENMASK(17, 16) 44 #define ATMEL_PIO_DRVSTR_OFFSET 16 45 #define ATMEL_PIO_CFGR_EVTSEL_MASK GENMASK(26, 24) 46 #define ATMEL_PIO_CFGR_EVTSEL_FALLING (0 << 24) 47 #define ATMEL_PIO_CFGR_EVTSEL_RISING (1 << 24) 48 #define ATMEL_PIO_CFGR_EVTSEL_BOTH (2 << 24) 49 #define ATMEL_PIO_CFGR_EVTSEL_LOW (3 << 24) 50 #define ATMEL_PIO_CFGR_EVTSEL_HIGH (4 << 24) 51 #define ATMEL_PIO_PDSR 0x0008 52 #define ATMEL_PIO_LOCKSR 0x000C 53 #define ATMEL_PIO_SODR 0x0010 54 #define ATMEL_PIO_CODR 0x0014 55 #define ATMEL_PIO_ODSR 0x0018 56 #define ATMEL_PIO_IER 0x0020 57 #define ATMEL_PIO_IDR 0x0024 58 #define ATMEL_PIO_IMR 0x0028 59 #define ATMEL_PIO_ISR 0x002C 60 #define ATMEL_PIO_IOFR 0x003C 61 62 #define ATMEL_PIO_NPINS_PER_BANK 32 63 #define ATMEL_PIO_BANK(pin_id) (pin_id / ATMEL_PIO_NPINS_PER_BANK) 64 #define ATMEL_PIO_LINE(pin_id) (pin_id % ATMEL_PIO_NPINS_PER_BANK) 65 #define ATMEL_PIO_BANK_OFFSET 0x40 66 67 #define ATMEL_GET_PIN_NO(pinfunc) ((pinfunc) & 0xff) 68 #define ATMEL_GET_PIN_FUNC(pinfunc) ((pinfunc >> 16) & 0xf) 69 #define ATMEL_GET_PIN_IOSET(pinfunc) ((pinfunc >> 20) & 0xf) 70 71 /* Custom pinconf parameters */ 72 #define ATMEL_PIN_CONFIG_DRIVE_STRENGTH (PIN_CONFIG_END + 1) 73 74 struct atmel_pioctrl_data { 75 unsigned nbanks; 76 }; 77 78 struct atmel_group { 79 const char *name; 80 u32 pin; 81 }; 82 83 struct atmel_pin { 84 unsigned pin_id; 85 unsigned mux; 86 unsigned ioset; 87 unsigned bank; 88 unsigned line; 89 const char *device; 90 }; 91 92 /** 93 * struct atmel_pioctrl - Atmel PIO controller (pinmux + gpio) 94 * @reg_base: base address of the controller. 95 * @clk: clock of the controller. 96 * @nbanks: number of PIO groups, it can vary depending on the SoC. 97 * @pinctrl_dev: pinctrl device registered. 98 * @groups: groups table to provide group name and pin in the group to pinctrl. 99 * @group_names: group names table to provide all the group/pin names to 100 * pinctrl or gpio. 101 * @pins: pins table used for both pinctrl and gpio. pin_id, bank and line 102 * fields are set at probe time. Other ones are set when parsing dt 103 * pinctrl. 104 * @npins: number of pins. 105 * @gpio_chip: gpio chip registered. 106 * @irq_domain: irq domain for the gpio controller. 107 * @irqs: table containing the hw irq number of the bank. The index of the 108 * table is the bank id. 109 * @pm_wakeup_sources: bitmap of wakeup sources (lines) 110 * @pm_suspend_backup: backup/restore register values on suspend/resume 111 * @dev: device entry for the Atmel PIO controller. 112 * @node: node of the Atmel PIO controller. 113 */ 114 struct atmel_pioctrl { 115 void __iomem *reg_base; 116 struct clk *clk; 117 unsigned nbanks; 118 struct pinctrl_dev *pinctrl_dev; 119 struct atmel_group *groups; 120 const char * const *group_names; 121 struct atmel_pin **pins; 122 unsigned npins; 123 struct gpio_chip *gpio_chip; 124 struct irq_domain *irq_domain; 125 int *irqs; 126 unsigned *pm_wakeup_sources; 127 struct { 128 u32 imr; 129 u32 odsr; 130 u32 cfgr[ATMEL_PIO_NPINS_PER_BANK]; 131 } *pm_suspend_backup; 132 struct device *dev; 133 struct device_node *node; 134 }; 135 136 static const char * const atmel_functions[] = { 137 "GPIO", "A", "B", "C", "D", "E", "F", "G" 138 }; 139 140 static const struct pinconf_generic_params atmel_custom_bindings[] = { 141 {"atmel,drive-strength", ATMEL_PIN_CONFIG_DRIVE_STRENGTH, 0}, 142 }; 143 144 /* --- GPIO --- */ 145 static unsigned int atmel_gpio_read(struct atmel_pioctrl *atmel_pioctrl, 146 unsigned int bank, unsigned int reg) 147 { 148 return readl_relaxed(atmel_pioctrl->reg_base 149 + ATMEL_PIO_BANK_OFFSET * bank + reg); 150 } 151 152 static void atmel_gpio_write(struct atmel_pioctrl *atmel_pioctrl, 153 unsigned int bank, unsigned int reg, 154 unsigned int val) 155 { 156 writel_relaxed(val, atmel_pioctrl->reg_base 157 + ATMEL_PIO_BANK_OFFSET * bank + reg); 158 } 159 160 static void atmel_gpio_irq_ack(struct irq_data *d) 161 { 162 /* 163 * Nothing to do, interrupt is cleared when reading the status 164 * register. 165 */ 166 } 167 168 static int atmel_gpio_irq_set_type(struct irq_data *d, unsigned type) 169 { 170 struct atmel_pioctrl *atmel_pioctrl = irq_data_get_irq_chip_data(d); 171 struct atmel_pin *pin = atmel_pioctrl->pins[d->hwirq]; 172 unsigned reg; 173 174 atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_MSKR, 175 BIT(pin->line)); 176 reg = atmel_gpio_read(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR); 177 reg &= (~ATMEL_PIO_CFGR_EVTSEL_MASK); 178 179 switch (type) { 180 case IRQ_TYPE_EDGE_RISING: 181 irq_set_handler_locked(d, handle_edge_irq); 182 reg |= ATMEL_PIO_CFGR_EVTSEL_RISING; 183 break; 184 case IRQ_TYPE_EDGE_FALLING: 185 irq_set_handler_locked(d, handle_edge_irq); 186 reg |= ATMEL_PIO_CFGR_EVTSEL_FALLING; 187 break; 188 case IRQ_TYPE_EDGE_BOTH: 189 irq_set_handler_locked(d, handle_edge_irq); 190 reg |= ATMEL_PIO_CFGR_EVTSEL_BOTH; 191 break; 192 case IRQ_TYPE_LEVEL_LOW: 193 irq_set_handler_locked(d, handle_level_irq); 194 reg |= ATMEL_PIO_CFGR_EVTSEL_LOW; 195 break; 196 case IRQ_TYPE_LEVEL_HIGH: 197 irq_set_handler_locked(d, handle_level_irq); 198 reg |= ATMEL_PIO_CFGR_EVTSEL_HIGH; 199 break; 200 case IRQ_TYPE_NONE: 201 default: 202 return -EINVAL; 203 } 204 205 atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR, reg); 206 207 return 0; 208 } 209 210 static void atmel_gpio_irq_mask(struct irq_data *d) 211 { 212 struct atmel_pioctrl *atmel_pioctrl = irq_data_get_irq_chip_data(d); 213 struct atmel_pin *pin = atmel_pioctrl->pins[d->hwirq]; 214 215 atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_IDR, 216 BIT(pin->line)); 217 } 218 219 static void atmel_gpio_irq_unmask(struct irq_data *d) 220 { 221 struct atmel_pioctrl *atmel_pioctrl = irq_data_get_irq_chip_data(d); 222 struct atmel_pin *pin = atmel_pioctrl->pins[d->hwirq]; 223 224 atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_IER, 225 BIT(pin->line)); 226 } 227 228 #ifdef CONFIG_PM_SLEEP 229 230 static int atmel_gpio_irq_set_wake(struct irq_data *d, unsigned int on) 231 { 232 struct atmel_pioctrl *atmel_pioctrl = irq_data_get_irq_chip_data(d); 233 int bank = ATMEL_PIO_BANK(d->hwirq); 234 int line = ATMEL_PIO_LINE(d->hwirq); 235 236 /* The gpio controller has one interrupt line per bank. */ 237 irq_set_irq_wake(atmel_pioctrl->irqs[bank], on); 238 239 if (on) 240 atmel_pioctrl->pm_wakeup_sources[bank] |= BIT(line); 241 else 242 atmel_pioctrl->pm_wakeup_sources[bank] &= ~(BIT(line)); 243 244 return 0; 245 } 246 #else 247 #define atmel_gpio_irq_set_wake NULL 248 #endif /* CONFIG_PM_SLEEP */ 249 250 static struct irq_chip atmel_gpio_irq_chip = { 251 .name = "GPIO", 252 .irq_ack = atmel_gpio_irq_ack, 253 .irq_mask = atmel_gpio_irq_mask, 254 .irq_unmask = atmel_gpio_irq_unmask, 255 .irq_set_type = atmel_gpio_irq_set_type, 256 .irq_set_wake = atmel_gpio_irq_set_wake, 257 }; 258 259 static int atmel_gpio_to_irq(struct gpio_chip *chip, unsigned offset) 260 { 261 struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip); 262 263 return irq_find_mapping(atmel_pioctrl->irq_domain, offset); 264 } 265 266 static void atmel_gpio_irq_handler(struct irq_desc *desc) 267 { 268 unsigned int irq = irq_desc_get_irq(desc); 269 struct atmel_pioctrl *atmel_pioctrl = irq_desc_get_handler_data(desc); 270 struct irq_chip *chip = irq_desc_get_chip(desc); 271 unsigned long isr; 272 int n, bank = -1; 273 274 /* Find from which bank is the irq received. */ 275 for (n = 0; n < atmel_pioctrl->nbanks; n++) { 276 if (atmel_pioctrl->irqs[n] == irq) { 277 bank = n; 278 break; 279 } 280 } 281 282 if (bank < 0) { 283 dev_err(atmel_pioctrl->dev, 284 "no bank associated to irq %u\n", irq); 285 return; 286 } 287 288 chained_irq_enter(chip, desc); 289 290 for (;;) { 291 isr = (unsigned long)atmel_gpio_read(atmel_pioctrl, bank, 292 ATMEL_PIO_ISR); 293 isr &= (unsigned long)atmel_gpio_read(atmel_pioctrl, bank, 294 ATMEL_PIO_IMR); 295 if (!isr) 296 break; 297 298 for_each_set_bit(n, &isr, BITS_PER_LONG) 299 generic_handle_irq(atmel_gpio_to_irq( 300 atmel_pioctrl->gpio_chip, 301 bank * ATMEL_PIO_NPINS_PER_BANK + n)); 302 } 303 304 chained_irq_exit(chip, desc); 305 } 306 307 static int atmel_gpio_direction_input(struct gpio_chip *chip, unsigned offset) 308 { 309 struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip); 310 struct atmel_pin *pin = atmel_pioctrl->pins[offset]; 311 unsigned reg; 312 313 atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_MSKR, 314 BIT(pin->line)); 315 reg = atmel_gpio_read(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR); 316 reg &= ~ATMEL_PIO_DIR_MASK; 317 atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR, reg); 318 319 return 0; 320 } 321 322 static int atmel_gpio_get(struct gpio_chip *chip, unsigned offset) 323 { 324 struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip); 325 struct atmel_pin *pin = atmel_pioctrl->pins[offset]; 326 unsigned reg; 327 328 reg = atmel_gpio_read(atmel_pioctrl, pin->bank, ATMEL_PIO_PDSR); 329 330 return !!(reg & BIT(pin->line)); 331 } 332 333 static int atmel_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask, 334 unsigned long *bits) 335 { 336 struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip); 337 unsigned int bank; 338 339 bitmap_zero(bits, atmel_pioctrl->npins); 340 341 for (bank = 0; bank < atmel_pioctrl->nbanks; bank++) { 342 unsigned int word = bank; 343 unsigned int offset = 0; 344 unsigned int reg; 345 346 #if ATMEL_PIO_NPINS_PER_BANK != BITS_PER_LONG 347 word = BIT_WORD(bank * ATMEL_PIO_NPINS_PER_BANK); 348 offset = bank * ATMEL_PIO_NPINS_PER_BANK % BITS_PER_LONG; 349 #endif 350 if (!mask[word]) 351 continue; 352 353 reg = atmel_gpio_read(atmel_pioctrl, bank, ATMEL_PIO_PDSR); 354 bits[word] |= mask[word] & (reg << offset); 355 } 356 357 return 0; 358 } 359 360 static int atmel_gpio_direction_output(struct gpio_chip *chip, unsigned offset, 361 int value) 362 { 363 struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip); 364 struct atmel_pin *pin = atmel_pioctrl->pins[offset]; 365 unsigned reg; 366 367 atmel_gpio_write(atmel_pioctrl, pin->bank, 368 value ? ATMEL_PIO_SODR : ATMEL_PIO_CODR, 369 BIT(pin->line)); 370 371 atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_MSKR, 372 BIT(pin->line)); 373 reg = atmel_gpio_read(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR); 374 reg |= ATMEL_PIO_DIR_MASK; 375 atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR, reg); 376 377 return 0; 378 } 379 380 static void atmel_gpio_set(struct gpio_chip *chip, unsigned offset, int val) 381 { 382 struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip); 383 struct atmel_pin *pin = atmel_pioctrl->pins[offset]; 384 385 atmel_gpio_write(atmel_pioctrl, pin->bank, 386 val ? ATMEL_PIO_SODR : ATMEL_PIO_CODR, 387 BIT(pin->line)); 388 } 389 390 static void atmel_gpio_set_multiple(struct gpio_chip *chip, unsigned long *mask, 391 unsigned long *bits) 392 { 393 struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip); 394 unsigned int bank; 395 396 for (bank = 0; bank < atmel_pioctrl->nbanks; bank++) { 397 unsigned int bitmask; 398 unsigned int word = bank; 399 400 /* 401 * On a 64-bit platform, BITS_PER_LONG is 64 so it is necessary to iterate over 402 * two 32bit words to handle the whole bitmask 403 */ 404 #if ATMEL_PIO_NPINS_PER_BANK != BITS_PER_LONG 405 word = BIT_WORD(bank * ATMEL_PIO_NPINS_PER_BANK); 406 #endif 407 if (!mask[word]) 408 continue; 409 410 bitmask = mask[word] & bits[word]; 411 atmel_gpio_write(atmel_pioctrl, bank, ATMEL_PIO_SODR, bitmask); 412 413 bitmask = mask[word] & ~bits[word]; 414 atmel_gpio_write(atmel_pioctrl, bank, ATMEL_PIO_CODR, bitmask); 415 416 #if ATMEL_PIO_NPINS_PER_BANK != BITS_PER_LONG 417 mask[word] >>= ATMEL_PIO_NPINS_PER_BANK; 418 bits[word] >>= ATMEL_PIO_NPINS_PER_BANK; 419 #endif 420 } 421 } 422 423 static struct gpio_chip atmel_gpio_chip = { 424 .direction_input = atmel_gpio_direction_input, 425 .get = atmel_gpio_get, 426 .get_multiple = atmel_gpio_get_multiple, 427 .direction_output = atmel_gpio_direction_output, 428 .set = atmel_gpio_set, 429 .set_multiple = atmel_gpio_set_multiple, 430 .to_irq = atmel_gpio_to_irq, 431 .base = 0, 432 }; 433 434 /* --- PINCTRL --- */ 435 static unsigned int atmel_pin_config_read(struct pinctrl_dev *pctldev, 436 unsigned pin_id) 437 { 438 struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev); 439 unsigned bank = atmel_pioctrl->pins[pin_id]->bank; 440 unsigned line = atmel_pioctrl->pins[pin_id]->line; 441 void __iomem *addr = atmel_pioctrl->reg_base 442 + bank * ATMEL_PIO_BANK_OFFSET; 443 444 writel_relaxed(BIT(line), addr + ATMEL_PIO_MSKR); 445 /* Have to set MSKR first, to access the right pin CFGR. */ 446 wmb(); 447 448 return readl_relaxed(addr + ATMEL_PIO_CFGR); 449 } 450 451 static void atmel_pin_config_write(struct pinctrl_dev *pctldev, 452 unsigned pin_id, u32 conf) 453 { 454 struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev); 455 unsigned bank = atmel_pioctrl->pins[pin_id]->bank; 456 unsigned line = atmel_pioctrl->pins[pin_id]->line; 457 void __iomem *addr = atmel_pioctrl->reg_base 458 + bank * ATMEL_PIO_BANK_OFFSET; 459 460 writel_relaxed(BIT(line), addr + ATMEL_PIO_MSKR); 461 /* Have to set MSKR first, to access the right pin CFGR. */ 462 wmb(); 463 writel_relaxed(conf, addr + ATMEL_PIO_CFGR); 464 } 465 466 static int atmel_pctl_get_groups_count(struct pinctrl_dev *pctldev) 467 { 468 struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev); 469 470 return atmel_pioctrl->npins; 471 } 472 473 static const char *atmel_pctl_get_group_name(struct pinctrl_dev *pctldev, 474 unsigned selector) 475 { 476 struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev); 477 478 return atmel_pioctrl->groups[selector].name; 479 } 480 481 static int atmel_pctl_get_group_pins(struct pinctrl_dev *pctldev, 482 unsigned selector, const unsigned **pins, 483 unsigned *num_pins) 484 { 485 struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev); 486 487 *pins = (unsigned *)&atmel_pioctrl->groups[selector].pin; 488 *num_pins = 1; 489 490 return 0; 491 } 492 493 static struct atmel_group * 494 atmel_pctl_find_group_by_pin(struct pinctrl_dev *pctldev, unsigned pin) 495 { 496 struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev); 497 int i; 498 499 for (i = 0; i < atmel_pioctrl->npins; i++) { 500 struct atmel_group *grp = atmel_pioctrl->groups + i; 501 502 if (grp->pin == pin) 503 return grp; 504 } 505 506 return NULL; 507 } 508 509 static int atmel_pctl_xlate_pinfunc(struct pinctrl_dev *pctldev, 510 struct device_node *np, 511 u32 pinfunc, const char **grp_name, 512 const char **func_name) 513 { 514 struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev); 515 unsigned pin_id, func_id; 516 struct atmel_group *grp; 517 518 pin_id = ATMEL_GET_PIN_NO(pinfunc); 519 func_id = ATMEL_GET_PIN_FUNC(pinfunc); 520 521 if (func_id >= ARRAY_SIZE(atmel_functions)) 522 return -EINVAL; 523 524 *func_name = atmel_functions[func_id]; 525 526 grp = atmel_pctl_find_group_by_pin(pctldev, pin_id); 527 if (!grp) 528 return -EINVAL; 529 *grp_name = grp->name; 530 531 atmel_pioctrl->pins[pin_id]->mux = func_id; 532 atmel_pioctrl->pins[pin_id]->ioset = ATMEL_GET_PIN_IOSET(pinfunc); 533 /* Want the device name not the group one. */ 534 if (np->parent == atmel_pioctrl->node) 535 atmel_pioctrl->pins[pin_id]->device = np->name; 536 else 537 atmel_pioctrl->pins[pin_id]->device = np->parent->name; 538 539 return 0; 540 } 541 542 static int atmel_pctl_dt_subnode_to_map(struct pinctrl_dev *pctldev, 543 struct device_node *np, 544 struct pinctrl_map **map, 545 unsigned *reserved_maps, 546 unsigned *num_maps) 547 { 548 unsigned num_pins, num_configs, reserve; 549 unsigned long *configs; 550 struct property *pins; 551 u32 pinfunc; 552 int ret, i; 553 554 pins = of_find_property(np, "pinmux", NULL); 555 if (!pins) 556 return -EINVAL; 557 558 ret = pinconf_generic_parse_dt_config(np, pctldev, &configs, 559 &num_configs); 560 if (ret < 0) { 561 dev_err(pctldev->dev, "%pOF: could not parse node property\n", 562 np); 563 return ret; 564 } 565 566 num_pins = pins->length / sizeof(u32); 567 if (!num_pins) { 568 dev_err(pctldev->dev, "no pins found in node %pOF\n", np); 569 ret = -EINVAL; 570 goto exit; 571 } 572 573 /* 574 * Reserve maps, at least there is a mux map and an optional conf 575 * map for each pin. 576 */ 577 reserve = 1; 578 if (num_configs) 579 reserve++; 580 reserve *= num_pins; 581 ret = pinctrl_utils_reserve_map(pctldev, map, reserved_maps, num_maps, 582 reserve); 583 if (ret < 0) 584 goto exit; 585 586 for (i = 0; i < num_pins; i++) { 587 const char *group, *func; 588 589 ret = of_property_read_u32_index(np, "pinmux", i, &pinfunc); 590 if (ret) 591 goto exit; 592 593 ret = atmel_pctl_xlate_pinfunc(pctldev, np, pinfunc, &group, 594 &func); 595 if (ret) 596 goto exit; 597 598 pinctrl_utils_add_map_mux(pctldev, map, reserved_maps, num_maps, 599 group, func); 600 601 if (num_configs) { 602 ret = pinctrl_utils_add_map_configs(pctldev, map, 603 reserved_maps, num_maps, group, 604 configs, num_configs, 605 PIN_MAP_TYPE_CONFIGS_GROUP); 606 if (ret < 0) 607 goto exit; 608 } 609 } 610 611 exit: 612 kfree(configs); 613 return ret; 614 } 615 616 static int atmel_pctl_dt_node_to_map(struct pinctrl_dev *pctldev, 617 struct device_node *np_config, 618 struct pinctrl_map **map, 619 unsigned *num_maps) 620 { 621 struct device_node *np; 622 unsigned reserved_maps; 623 int ret; 624 625 *map = NULL; 626 *num_maps = 0; 627 reserved_maps = 0; 628 629 /* 630 * If all the pins of a device have the same configuration (or no one), 631 * it is useless to add a subnode, so directly parse node referenced by 632 * phandle. 633 */ 634 ret = atmel_pctl_dt_subnode_to_map(pctldev, np_config, map, 635 &reserved_maps, num_maps); 636 if (ret) { 637 for_each_child_of_node(np_config, np) { 638 ret = atmel_pctl_dt_subnode_to_map(pctldev, np, map, 639 &reserved_maps, num_maps); 640 if (ret < 0) { 641 of_node_put(np); 642 break; 643 } 644 } 645 } 646 647 if (ret < 0) { 648 pinctrl_utils_free_map(pctldev, *map, *num_maps); 649 dev_err(pctldev->dev, "can't create maps for node %pOF\n", 650 np_config); 651 } 652 653 return ret; 654 } 655 656 static const struct pinctrl_ops atmel_pctlops = { 657 .get_groups_count = atmel_pctl_get_groups_count, 658 .get_group_name = atmel_pctl_get_group_name, 659 .get_group_pins = atmel_pctl_get_group_pins, 660 .dt_node_to_map = atmel_pctl_dt_node_to_map, 661 .dt_free_map = pinctrl_utils_free_map, 662 }; 663 664 static int atmel_pmx_get_functions_count(struct pinctrl_dev *pctldev) 665 { 666 return ARRAY_SIZE(atmel_functions); 667 } 668 669 static const char *atmel_pmx_get_function_name(struct pinctrl_dev *pctldev, 670 unsigned selector) 671 { 672 return atmel_functions[selector]; 673 } 674 675 static int atmel_pmx_get_function_groups(struct pinctrl_dev *pctldev, 676 unsigned selector, 677 const char * const **groups, 678 unsigned * const num_groups) 679 { 680 struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev); 681 682 *groups = atmel_pioctrl->group_names; 683 *num_groups = atmel_pioctrl->npins; 684 685 return 0; 686 } 687 688 static int atmel_pmx_set_mux(struct pinctrl_dev *pctldev, 689 unsigned function, 690 unsigned group) 691 { 692 struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev); 693 unsigned pin; 694 u32 conf; 695 696 dev_dbg(pctldev->dev, "enable function %s group %s\n", 697 atmel_functions[function], atmel_pioctrl->groups[group].name); 698 699 pin = atmel_pioctrl->groups[group].pin; 700 conf = atmel_pin_config_read(pctldev, pin); 701 conf &= (~ATMEL_PIO_CFGR_FUNC_MASK); 702 conf |= (function & ATMEL_PIO_CFGR_FUNC_MASK); 703 dev_dbg(pctldev->dev, "pin: %u, conf: 0x%08x\n", pin, conf); 704 atmel_pin_config_write(pctldev, pin, conf); 705 706 return 0; 707 } 708 709 static const struct pinmux_ops atmel_pmxops = { 710 .get_functions_count = atmel_pmx_get_functions_count, 711 .get_function_name = atmel_pmx_get_function_name, 712 .get_function_groups = atmel_pmx_get_function_groups, 713 .set_mux = atmel_pmx_set_mux, 714 }; 715 716 static int atmel_conf_pin_config_group_get(struct pinctrl_dev *pctldev, 717 unsigned group, 718 unsigned long *config) 719 { 720 struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev); 721 unsigned param = pinconf_to_config_param(*config), arg = 0; 722 struct atmel_group *grp = atmel_pioctrl->groups + group; 723 unsigned pin_id = grp->pin; 724 u32 res; 725 726 res = atmel_pin_config_read(pctldev, pin_id); 727 728 switch (param) { 729 case PIN_CONFIG_BIAS_PULL_UP: 730 if (!(res & ATMEL_PIO_PUEN_MASK)) 731 return -EINVAL; 732 arg = 1; 733 break; 734 case PIN_CONFIG_BIAS_PULL_DOWN: 735 if ((res & ATMEL_PIO_PUEN_MASK) || 736 (!(res & ATMEL_PIO_PDEN_MASK))) 737 return -EINVAL; 738 arg = 1; 739 break; 740 case PIN_CONFIG_BIAS_DISABLE: 741 if ((res & ATMEL_PIO_PUEN_MASK) || 742 ((res & ATMEL_PIO_PDEN_MASK))) 743 return -EINVAL; 744 arg = 1; 745 break; 746 case PIN_CONFIG_DRIVE_OPEN_DRAIN: 747 if (!(res & ATMEL_PIO_OPD_MASK)) 748 return -EINVAL; 749 arg = 1; 750 break; 751 case PIN_CONFIG_INPUT_SCHMITT_ENABLE: 752 if (!(res & ATMEL_PIO_SCHMITT_MASK)) 753 return -EINVAL; 754 arg = 1; 755 break; 756 case ATMEL_PIN_CONFIG_DRIVE_STRENGTH: 757 if (!(res & ATMEL_PIO_DRVSTR_MASK)) 758 return -EINVAL; 759 arg = (res & ATMEL_PIO_DRVSTR_MASK) >> ATMEL_PIO_DRVSTR_OFFSET; 760 break; 761 default: 762 return -ENOTSUPP; 763 } 764 765 *config = pinconf_to_config_packed(param, arg); 766 return 0; 767 } 768 769 static int atmel_conf_pin_config_group_set(struct pinctrl_dev *pctldev, 770 unsigned group, 771 unsigned long *configs, 772 unsigned num_configs) 773 { 774 struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev); 775 struct atmel_group *grp = atmel_pioctrl->groups + group; 776 unsigned bank, pin, pin_id = grp->pin; 777 u32 mask, conf = 0; 778 int i; 779 780 conf = atmel_pin_config_read(pctldev, pin_id); 781 782 for (i = 0; i < num_configs; i++) { 783 unsigned param = pinconf_to_config_param(configs[i]); 784 unsigned arg = pinconf_to_config_argument(configs[i]); 785 786 dev_dbg(pctldev->dev, "%s: pin=%u, config=0x%lx\n", 787 __func__, pin_id, configs[i]); 788 789 switch (param) { 790 case PIN_CONFIG_BIAS_DISABLE: 791 conf &= (~ATMEL_PIO_PUEN_MASK); 792 conf &= (~ATMEL_PIO_PDEN_MASK); 793 break; 794 case PIN_CONFIG_BIAS_PULL_UP: 795 conf |= ATMEL_PIO_PUEN_MASK; 796 conf &= (~ATMEL_PIO_PDEN_MASK); 797 break; 798 case PIN_CONFIG_BIAS_PULL_DOWN: 799 conf |= ATMEL_PIO_PDEN_MASK; 800 conf &= (~ATMEL_PIO_PUEN_MASK); 801 break; 802 case PIN_CONFIG_DRIVE_OPEN_DRAIN: 803 if (arg == 0) 804 conf &= (~ATMEL_PIO_OPD_MASK); 805 else 806 conf |= ATMEL_PIO_OPD_MASK; 807 break; 808 case PIN_CONFIG_INPUT_SCHMITT_ENABLE: 809 if (arg == 0) 810 conf |= ATMEL_PIO_SCHMITT_MASK; 811 else 812 conf &= (~ATMEL_PIO_SCHMITT_MASK); 813 break; 814 case PIN_CONFIG_INPUT_DEBOUNCE: 815 if (arg == 0) { 816 conf &= (~ATMEL_PIO_IFEN_MASK); 817 conf &= (~ATMEL_PIO_IFSCEN_MASK); 818 } else { 819 /* 820 * We don't care about the debounce value for several reasons: 821 * - can't have different debounce periods inside a same group, 822 * - the register to configure this period is a secure register. 823 * The debouncing filter can filter a pulse with a duration of less 824 * than 1/2 slow clock period. 825 */ 826 conf |= ATMEL_PIO_IFEN_MASK; 827 conf |= ATMEL_PIO_IFSCEN_MASK; 828 } 829 break; 830 case PIN_CONFIG_OUTPUT: 831 conf |= ATMEL_PIO_DIR_MASK; 832 bank = ATMEL_PIO_BANK(pin_id); 833 pin = ATMEL_PIO_LINE(pin_id); 834 mask = 1 << pin; 835 836 if (arg == 0) { 837 writel_relaxed(mask, atmel_pioctrl->reg_base + 838 bank * ATMEL_PIO_BANK_OFFSET + 839 ATMEL_PIO_CODR); 840 } else { 841 writel_relaxed(mask, atmel_pioctrl->reg_base + 842 bank * ATMEL_PIO_BANK_OFFSET + 843 ATMEL_PIO_SODR); 844 } 845 break; 846 case ATMEL_PIN_CONFIG_DRIVE_STRENGTH: 847 switch (arg) { 848 case ATMEL_PIO_DRVSTR_LO: 849 case ATMEL_PIO_DRVSTR_ME: 850 case ATMEL_PIO_DRVSTR_HI: 851 conf &= (~ATMEL_PIO_DRVSTR_MASK); 852 conf |= arg << ATMEL_PIO_DRVSTR_OFFSET; 853 break; 854 default: 855 dev_warn(pctldev->dev, "drive strength not updated (incorrect value)\n"); 856 } 857 break; 858 default: 859 dev_warn(pctldev->dev, 860 "unsupported configuration parameter: %u\n", 861 param); 862 continue; 863 } 864 } 865 866 dev_dbg(pctldev->dev, "%s: reg=0x%08x\n", __func__, conf); 867 atmel_pin_config_write(pctldev, pin_id, conf); 868 869 return 0; 870 } 871 872 static void atmel_conf_pin_config_dbg_show(struct pinctrl_dev *pctldev, 873 struct seq_file *s, unsigned pin_id) 874 { 875 struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev); 876 u32 conf; 877 878 if (!atmel_pioctrl->pins[pin_id]->device) 879 return; 880 881 if (atmel_pioctrl->pins[pin_id]) 882 seq_printf(s, " (%s, ioset %u) ", 883 atmel_pioctrl->pins[pin_id]->device, 884 atmel_pioctrl->pins[pin_id]->ioset); 885 886 conf = atmel_pin_config_read(pctldev, pin_id); 887 if (conf & ATMEL_PIO_PUEN_MASK) 888 seq_printf(s, "%s ", "pull-up"); 889 if (conf & ATMEL_PIO_PDEN_MASK) 890 seq_printf(s, "%s ", "pull-down"); 891 if (conf & ATMEL_PIO_IFEN_MASK) 892 seq_printf(s, "%s ", "debounce"); 893 if (conf & ATMEL_PIO_OPD_MASK) 894 seq_printf(s, "%s ", "open-drain"); 895 if (conf & ATMEL_PIO_SCHMITT_MASK) 896 seq_printf(s, "%s ", "schmitt"); 897 if (conf & ATMEL_PIO_DRVSTR_MASK) { 898 switch ((conf & ATMEL_PIO_DRVSTR_MASK) >> ATMEL_PIO_DRVSTR_OFFSET) { 899 case ATMEL_PIO_DRVSTR_ME: 900 seq_printf(s, "%s ", "medium-drive"); 901 break; 902 case ATMEL_PIO_DRVSTR_HI: 903 seq_printf(s, "%s ", "high-drive"); 904 break; 905 /* ATMEL_PIO_DRVSTR_LO and 0 which is the default value at reset */ 906 default: 907 seq_printf(s, "%s ", "low-drive"); 908 } 909 } 910 } 911 912 static const struct pinconf_ops atmel_confops = { 913 .pin_config_group_get = atmel_conf_pin_config_group_get, 914 .pin_config_group_set = atmel_conf_pin_config_group_set, 915 .pin_config_dbg_show = atmel_conf_pin_config_dbg_show, 916 }; 917 918 static struct pinctrl_desc atmel_pinctrl_desc = { 919 .name = "atmel_pinctrl", 920 .confops = &atmel_confops, 921 .pctlops = &atmel_pctlops, 922 .pmxops = &atmel_pmxops, 923 }; 924 925 static int __maybe_unused atmel_pctrl_suspend(struct device *dev) 926 { 927 struct atmel_pioctrl *atmel_pioctrl = dev_get_drvdata(dev); 928 int i, j; 929 930 /* 931 * For each bank, save IMR to restore it later and disable all GPIO 932 * interrupts excepting the ones marked as wakeup sources. 933 */ 934 for (i = 0; i < atmel_pioctrl->nbanks; i++) { 935 atmel_pioctrl->pm_suspend_backup[i].imr = 936 atmel_gpio_read(atmel_pioctrl, i, ATMEL_PIO_IMR); 937 atmel_gpio_write(atmel_pioctrl, i, ATMEL_PIO_IDR, 938 ~atmel_pioctrl->pm_wakeup_sources[i]); 939 atmel_pioctrl->pm_suspend_backup[i].odsr = 940 atmel_gpio_read(atmel_pioctrl, i, ATMEL_PIO_ODSR); 941 for (j = 0; j < ATMEL_PIO_NPINS_PER_BANK; j++) { 942 atmel_gpio_write(atmel_pioctrl, i, 943 ATMEL_PIO_MSKR, BIT(j)); 944 atmel_pioctrl->pm_suspend_backup[i].cfgr[j] = 945 atmel_gpio_read(atmel_pioctrl, i, 946 ATMEL_PIO_CFGR); 947 } 948 } 949 950 return 0; 951 } 952 953 static int __maybe_unused atmel_pctrl_resume(struct device *dev) 954 { 955 struct atmel_pioctrl *atmel_pioctrl = dev_get_drvdata(dev); 956 int i, j; 957 958 for (i = 0; i < atmel_pioctrl->nbanks; i++) { 959 atmel_gpio_write(atmel_pioctrl, i, ATMEL_PIO_IER, 960 atmel_pioctrl->pm_suspend_backup[i].imr); 961 atmel_gpio_write(atmel_pioctrl, i, ATMEL_PIO_SODR, 962 atmel_pioctrl->pm_suspend_backup[i].odsr); 963 for (j = 0; j < ATMEL_PIO_NPINS_PER_BANK; j++) { 964 atmel_gpio_write(atmel_pioctrl, i, 965 ATMEL_PIO_MSKR, BIT(j)); 966 atmel_gpio_write(atmel_pioctrl, i, ATMEL_PIO_CFGR, 967 atmel_pioctrl->pm_suspend_backup[i].cfgr[j]); 968 } 969 } 970 971 return 0; 972 } 973 974 static const struct dev_pm_ops atmel_pctrl_pm_ops = { 975 SET_SYSTEM_SLEEP_PM_OPS(atmel_pctrl_suspend, atmel_pctrl_resume) 976 }; 977 978 /* 979 * The number of banks can be different from a SoC to another one. 980 * We can have up to 16 banks. 981 */ 982 static const struct atmel_pioctrl_data atmel_sama5d2_pioctrl_data = { 983 .nbanks = 4, 984 }; 985 986 static const struct of_device_id atmel_pctrl_of_match[] = { 987 { 988 .compatible = "atmel,sama5d2-pinctrl", 989 .data = &atmel_sama5d2_pioctrl_data, 990 }, { 991 /* sentinel */ 992 } 993 }; 994 995 static int atmel_pinctrl_probe(struct platform_device *pdev) 996 { 997 struct device *dev = &pdev->dev; 998 struct pinctrl_pin_desc *pin_desc; 999 const char **group_names; 1000 const struct of_device_id *match; 1001 int i, ret; 1002 struct resource *res; 1003 struct atmel_pioctrl *atmel_pioctrl; 1004 const struct atmel_pioctrl_data *atmel_pioctrl_data; 1005 1006 atmel_pioctrl = devm_kzalloc(dev, sizeof(*atmel_pioctrl), GFP_KERNEL); 1007 if (!atmel_pioctrl) 1008 return -ENOMEM; 1009 atmel_pioctrl->dev = dev; 1010 atmel_pioctrl->node = dev->of_node; 1011 platform_set_drvdata(pdev, atmel_pioctrl); 1012 1013 match = of_match_node(atmel_pctrl_of_match, dev->of_node); 1014 if (!match) { 1015 dev_err(dev, "unknown compatible string\n"); 1016 return -ENODEV; 1017 } 1018 atmel_pioctrl_data = match->data; 1019 atmel_pioctrl->nbanks = atmel_pioctrl_data->nbanks; 1020 atmel_pioctrl->npins = atmel_pioctrl->nbanks * ATMEL_PIO_NPINS_PER_BANK; 1021 1022 atmel_pioctrl->reg_base = devm_platform_ioremap_resource(pdev, 0); 1023 if (IS_ERR(atmel_pioctrl->reg_base)) 1024 return PTR_ERR(atmel_pioctrl->reg_base); 1025 1026 atmel_pioctrl->clk = devm_clk_get(dev, NULL); 1027 if (IS_ERR(atmel_pioctrl->clk)) { 1028 dev_err(dev, "failed to get clock\n"); 1029 return PTR_ERR(atmel_pioctrl->clk); 1030 } 1031 1032 atmel_pioctrl->pins = devm_kcalloc(dev, 1033 atmel_pioctrl->npins, 1034 sizeof(*atmel_pioctrl->pins), 1035 GFP_KERNEL); 1036 if (!atmel_pioctrl->pins) 1037 return -ENOMEM; 1038 1039 pin_desc = devm_kcalloc(dev, atmel_pioctrl->npins, sizeof(*pin_desc), 1040 GFP_KERNEL); 1041 if (!pin_desc) 1042 return -ENOMEM; 1043 atmel_pinctrl_desc.pins = pin_desc; 1044 atmel_pinctrl_desc.npins = atmel_pioctrl->npins; 1045 atmel_pinctrl_desc.num_custom_params = ARRAY_SIZE(atmel_custom_bindings); 1046 atmel_pinctrl_desc.custom_params = atmel_custom_bindings; 1047 1048 /* One pin is one group since a pin can achieve all functions. */ 1049 group_names = devm_kcalloc(dev, 1050 atmel_pioctrl->npins, sizeof(*group_names), 1051 GFP_KERNEL); 1052 if (!group_names) 1053 return -ENOMEM; 1054 atmel_pioctrl->group_names = group_names; 1055 1056 atmel_pioctrl->groups = devm_kcalloc(&pdev->dev, 1057 atmel_pioctrl->npins, sizeof(*atmel_pioctrl->groups), 1058 GFP_KERNEL); 1059 if (!atmel_pioctrl->groups) 1060 return -ENOMEM; 1061 for (i = 0 ; i < atmel_pioctrl->npins; i++) { 1062 struct atmel_group *group = atmel_pioctrl->groups + i; 1063 unsigned bank = ATMEL_PIO_BANK(i); 1064 unsigned line = ATMEL_PIO_LINE(i); 1065 1066 atmel_pioctrl->pins[i] = devm_kzalloc(dev, 1067 sizeof(**atmel_pioctrl->pins), GFP_KERNEL); 1068 if (!atmel_pioctrl->pins[i]) 1069 return -ENOMEM; 1070 1071 atmel_pioctrl->pins[i]->pin_id = i; 1072 atmel_pioctrl->pins[i]->bank = bank; 1073 atmel_pioctrl->pins[i]->line = line; 1074 1075 pin_desc[i].number = i; 1076 /* Pin naming convention: P(bank_name)(bank_pin_number). */ 1077 pin_desc[i].name = kasprintf(GFP_KERNEL, "P%c%d", 1078 bank + 'A', line); 1079 1080 group->name = group_names[i] = pin_desc[i].name; 1081 group->pin = pin_desc[i].number; 1082 1083 dev_dbg(dev, "pin_id=%u, bank=%u, line=%u", i, bank, line); 1084 } 1085 1086 atmel_pioctrl->gpio_chip = &atmel_gpio_chip; 1087 atmel_pioctrl->gpio_chip->of_node = dev->of_node; 1088 atmel_pioctrl->gpio_chip->ngpio = atmel_pioctrl->npins; 1089 atmel_pioctrl->gpio_chip->label = dev_name(dev); 1090 atmel_pioctrl->gpio_chip->parent = dev; 1091 atmel_pioctrl->gpio_chip->names = atmel_pioctrl->group_names; 1092 1093 atmel_pioctrl->pm_wakeup_sources = devm_kcalloc(dev, 1094 atmel_pioctrl->nbanks, 1095 sizeof(*atmel_pioctrl->pm_wakeup_sources), 1096 GFP_KERNEL); 1097 if (!atmel_pioctrl->pm_wakeup_sources) 1098 return -ENOMEM; 1099 1100 atmel_pioctrl->pm_suspend_backup = devm_kcalloc(dev, 1101 atmel_pioctrl->nbanks, 1102 sizeof(*atmel_pioctrl->pm_suspend_backup), 1103 GFP_KERNEL); 1104 if (!atmel_pioctrl->pm_suspend_backup) 1105 return -ENOMEM; 1106 1107 atmel_pioctrl->irqs = devm_kcalloc(dev, 1108 atmel_pioctrl->nbanks, 1109 sizeof(*atmel_pioctrl->irqs), 1110 GFP_KERNEL); 1111 if (!atmel_pioctrl->irqs) 1112 return -ENOMEM; 1113 1114 /* There is one controller but each bank has its own irq line. */ 1115 for (i = 0; i < atmel_pioctrl->nbanks; i++) { 1116 res = platform_get_resource(pdev, IORESOURCE_IRQ, i); 1117 if (!res) { 1118 dev_err(dev, "missing irq resource for group %c\n", 1119 'A' + i); 1120 return -EINVAL; 1121 } 1122 atmel_pioctrl->irqs[i] = res->start; 1123 irq_set_chained_handler(res->start, atmel_gpio_irq_handler); 1124 irq_set_handler_data(res->start, atmel_pioctrl); 1125 dev_dbg(dev, "bank %i: irq=%pr\n", i, res); 1126 } 1127 1128 atmel_pioctrl->irq_domain = irq_domain_add_linear(dev->of_node, 1129 atmel_pioctrl->gpio_chip->ngpio, 1130 &irq_domain_simple_ops, NULL); 1131 if (!atmel_pioctrl->irq_domain) { 1132 dev_err(dev, "can't add the irq domain\n"); 1133 return -ENODEV; 1134 } 1135 atmel_pioctrl->irq_domain->name = "atmel gpio"; 1136 1137 for (i = 0; i < atmel_pioctrl->npins; i++) { 1138 int irq = irq_create_mapping(atmel_pioctrl->irq_domain, i); 1139 1140 irq_set_chip_and_handler(irq, &atmel_gpio_irq_chip, 1141 handle_simple_irq); 1142 irq_set_chip_data(irq, atmel_pioctrl); 1143 dev_dbg(dev, 1144 "atmel gpio irq domain: hwirq: %d, linux irq: %d\n", 1145 i, irq); 1146 } 1147 1148 ret = clk_prepare_enable(atmel_pioctrl->clk); 1149 if (ret) { 1150 dev_err(dev, "failed to prepare and enable clock\n"); 1151 goto clk_prepare_enable_error; 1152 } 1153 1154 atmel_pioctrl->pinctrl_dev = devm_pinctrl_register(&pdev->dev, 1155 &atmel_pinctrl_desc, 1156 atmel_pioctrl); 1157 if (IS_ERR(atmel_pioctrl->pinctrl_dev)) { 1158 ret = PTR_ERR(atmel_pioctrl->pinctrl_dev); 1159 dev_err(dev, "pinctrl registration failed\n"); 1160 goto clk_unprep; 1161 } 1162 1163 ret = gpiochip_add_data(atmel_pioctrl->gpio_chip, atmel_pioctrl); 1164 if (ret) { 1165 dev_err(dev, "failed to add gpiochip\n"); 1166 goto clk_unprep; 1167 } 1168 1169 ret = gpiochip_add_pin_range(atmel_pioctrl->gpio_chip, dev_name(dev), 1170 0, 0, atmel_pioctrl->gpio_chip->ngpio); 1171 if (ret) { 1172 dev_err(dev, "failed to add gpio pin range\n"); 1173 goto gpiochip_add_pin_range_error; 1174 } 1175 1176 dev_info(&pdev->dev, "atmel pinctrl initialized\n"); 1177 1178 return 0; 1179 1180 gpiochip_add_pin_range_error: 1181 gpiochip_remove(atmel_pioctrl->gpio_chip); 1182 1183 clk_unprep: 1184 clk_disable_unprepare(atmel_pioctrl->clk); 1185 1186 clk_prepare_enable_error: 1187 irq_domain_remove(atmel_pioctrl->irq_domain); 1188 1189 return ret; 1190 } 1191 1192 static struct platform_driver atmel_pinctrl_driver = { 1193 .driver = { 1194 .name = "pinctrl-at91-pio4", 1195 .of_match_table = atmel_pctrl_of_match, 1196 .pm = &atmel_pctrl_pm_ops, 1197 .suppress_bind_attrs = true, 1198 }, 1199 .probe = atmel_pinctrl_probe, 1200 }; 1201 builtin_platform_driver(atmel_pinctrl_driver); 1202