1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * GPIO driver for AMD 4 * 5 * Copyright (c) 2014,2015 AMD Corporation. 6 * Authors: Ken Xue <Ken.Xue@amd.com> 7 * Wu, Jeff <Jeff.Wu@amd.com> 8 * 9 */ 10 11#include <linux/err.h> 12#include <linux/bug.h> 13#include <linux/kernel.h> 14#include <linux/module.h> 15#include <linux/spinlock.h> 16#include <linux/compiler.h> 17#include <linux/types.h> 18#include <linux/errno.h> 19#include <linux/log2.h> 20#include <linux/io.h> 21#include <linux/gpio/driver.h> 22#include <linux/slab.h> 23#include <linux/platform_device.h> 24#include <linux/mutex.h> 25#include <linux/acpi.h> 26#include <linux/seq_file.h> 27#include <linux/interrupt.h> 28#include <linux/list.h> 29#include <linux/bitops.h> 30#include <linux/pinctrl/pinconf.h> 31#include <linux/pinctrl/pinconf-generic.h> 32#include <linux/pinctrl/pinmux.h> 33#include <linux/suspend.h> 34 35#include "core.h" 36#include "pinctrl-utils.h" 37#include "pinctrl-amd.h" 38 39static int amd_gpio_get_direction(struct gpio_chip *gc, unsigned offset) 40{ 41 unsigned long flags; 42 u32 pin_reg; 43 struct amd_gpio *gpio_dev = gpiochip_get_data(gc); 44 45 raw_spin_lock_irqsave(&gpio_dev->lock, flags); 46 pin_reg = readl(gpio_dev->base + offset * 4); 47 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); 48 49 if (pin_reg & BIT(OUTPUT_ENABLE_OFF)) 50 return GPIO_LINE_DIRECTION_OUT; 51 52 return GPIO_LINE_DIRECTION_IN; 53} 54 55static int amd_gpio_direction_input(struct gpio_chip *gc, unsigned offset) 56{ 57 unsigned long flags; 58 u32 pin_reg; 59 struct amd_gpio *gpio_dev = gpiochip_get_data(gc); 60 61 raw_spin_lock_irqsave(&gpio_dev->lock, flags); 62 pin_reg = readl(gpio_dev->base + offset * 4); 63 pin_reg &= ~BIT(OUTPUT_ENABLE_OFF); 64 writel(pin_reg, gpio_dev->base + offset * 4); 65 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); 66 67 return 0; 68} 69 70static int amd_gpio_direction_output(struct gpio_chip *gc, unsigned offset, 71 int value) 72{ 73 u32 pin_reg; 74 unsigned long flags; 75 struct amd_gpio *gpio_dev = gpiochip_get_data(gc); 76 77 raw_spin_lock_irqsave(&gpio_dev->lock, flags); 78 pin_reg = readl(gpio_dev->base + offset * 4); 79 pin_reg |= BIT(OUTPUT_ENABLE_OFF); 80 if (value) 81 pin_reg |= BIT(OUTPUT_VALUE_OFF); 82 else 83 pin_reg &= ~BIT(OUTPUT_VALUE_OFF); 84 writel(pin_reg, gpio_dev->base + offset * 4); 85 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); 86 87 return 0; 88} 89 90static int amd_gpio_get_value(struct gpio_chip *gc, unsigned offset) 91{ 92 u32 pin_reg; 93 unsigned long flags; 94 struct amd_gpio *gpio_dev = gpiochip_get_data(gc); 95 96 raw_spin_lock_irqsave(&gpio_dev->lock, flags); 97 pin_reg = readl(gpio_dev->base + offset * 4); 98 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); 99 100 return !!(pin_reg & BIT(PIN_STS_OFF)); 101} 102 103static void amd_gpio_set_value(struct gpio_chip *gc, unsigned offset, int value) 104{ 105 u32 pin_reg; 106 unsigned long flags; 107 struct amd_gpio *gpio_dev = gpiochip_get_data(gc); 108 109 raw_spin_lock_irqsave(&gpio_dev->lock, flags); 110 pin_reg = readl(gpio_dev->base + offset * 4); 111 if (value) 112 pin_reg |= BIT(OUTPUT_VALUE_OFF); 113 else 114 pin_reg &= ~BIT(OUTPUT_VALUE_OFF); 115 writel(pin_reg, gpio_dev->base + offset * 4); 116 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); 117} 118 119static int amd_gpio_set_debounce(struct amd_gpio *gpio_dev, unsigned int offset, 120 unsigned int debounce) 121{ 122 u32 time; 123 u32 pin_reg; 124 int ret = 0; 125 126 /* Use special handling for Pin0 debounce */ 127 if (offset == 0) { 128 pin_reg = readl(gpio_dev->base + WAKE_INT_MASTER_REG); 129 if (pin_reg & INTERNAL_GPIO0_DEBOUNCE) 130 debounce = 0; 131 } 132 133 pin_reg = readl(gpio_dev->base + offset * 4); 134 135 if (debounce) { 136 pin_reg |= DB_TYPE_REMOVE_GLITCH << DB_CNTRL_OFF; 137 pin_reg &= ~DB_TMR_OUT_MASK; 138 /* 139 Debounce Debounce Timer Max 140 TmrLarge TmrOutUnit Unit Debounce 141 Time 142 0 0 61 usec (2 RtcClk) 976 usec 143 0 1 244 usec (8 RtcClk) 3.9 msec 144 1 0 15.6 msec (512 RtcClk) 250 msec 145 1 1 62.5 msec (2048 RtcClk) 1 sec 146 */ 147 148 if (debounce < 61) { 149 pin_reg |= 1; 150 pin_reg &= ~BIT(DB_TMR_OUT_UNIT_OFF); 151 pin_reg &= ~BIT(DB_TMR_LARGE_OFF); 152 } else if (debounce < 976) { 153 time = debounce / 61; 154 pin_reg |= time & DB_TMR_OUT_MASK; 155 pin_reg &= ~BIT(DB_TMR_OUT_UNIT_OFF); 156 pin_reg &= ~BIT(DB_TMR_LARGE_OFF); 157 } else if (debounce < 3900) { 158 time = debounce / 244; 159 pin_reg |= time & DB_TMR_OUT_MASK; 160 pin_reg |= BIT(DB_TMR_OUT_UNIT_OFF); 161 pin_reg &= ~BIT(DB_TMR_LARGE_OFF); 162 } else if (debounce < 250000) { 163 time = debounce / 15625; 164 pin_reg |= time & DB_TMR_OUT_MASK; 165 pin_reg &= ~BIT(DB_TMR_OUT_UNIT_OFF); 166 pin_reg |= BIT(DB_TMR_LARGE_OFF); 167 } else if (debounce < 1000000) { 168 time = debounce / 62500; 169 pin_reg |= time & DB_TMR_OUT_MASK; 170 pin_reg |= BIT(DB_TMR_OUT_UNIT_OFF); 171 pin_reg |= BIT(DB_TMR_LARGE_OFF); 172 } else { 173 pin_reg &= ~(DB_CNTRl_MASK << DB_CNTRL_OFF); 174 ret = -EINVAL; 175 } 176 } else { 177 pin_reg &= ~BIT(DB_TMR_OUT_UNIT_OFF); 178 pin_reg &= ~BIT(DB_TMR_LARGE_OFF); 179 pin_reg &= ~DB_TMR_OUT_MASK; 180 pin_reg &= ~(DB_CNTRl_MASK << DB_CNTRL_OFF); 181 } 182 writel(pin_reg, gpio_dev->base + offset * 4); 183 184 return ret; 185} 186 187#ifdef CONFIG_DEBUG_FS 188static void amd_gpio_dbg_show(struct seq_file *s, struct gpio_chip *gc) 189{ 190 u32 pin_reg; 191 u32 db_cntrl; 192 unsigned long flags; 193 unsigned int bank, i, pin_num; 194 struct amd_gpio *gpio_dev = gpiochip_get_data(gc); 195 196 bool tmr_out_unit; 197 bool tmr_large; 198 199 char *level_trig; 200 char *active_level; 201 char *interrupt_mask; 202 char *wake_cntrl0; 203 char *wake_cntrl1; 204 char *wake_cntrl2; 205 char *pin_sts; 206 char *interrupt_sts; 207 char *wake_sts; 208 char *orientation; 209 char debounce_value[40]; 210 char *debounce_enable; 211 char *wake_cntrlz; 212 213 seq_printf(s, "WAKE_INT_MASTER_REG: 0x%08x\n", readl(gpio_dev->base + WAKE_INT_MASTER_REG)); 214 for (bank = 0; bank < gpio_dev->hwbank_num; bank++) { 215 unsigned int time = 0; 216 unsigned int unit = 0; 217 218 switch (bank) { 219 case 0: 220 i = 0; 221 pin_num = AMD_GPIO_PINS_BANK0; 222 break; 223 case 1: 224 i = 64; 225 pin_num = AMD_GPIO_PINS_BANK1 + i; 226 break; 227 case 2: 228 i = 128; 229 pin_num = AMD_GPIO_PINS_BANK2 + i; 230 break; 231 case 3: 232 i = 192; 233 pin_num = AMD_GPIO_PINS_BANK3 + i; 234 break; 235 default: 236 /* Illegal bank number, ignore */ 237 continue; 238 } 239 seq_printf(s, "GPIO bank%d\n", bank); 240 seq_puts(s, "gpio\t int|active|trigger|S0i3| S3|S4/S5| Z|wake|pull| orient| debounce|reg\n"); 241 for (; i < pin_num; i++) { 242 seq_printf(s, "#%d\t", i); 243 raw_spin_lock_irqsave(&gpio_dev->lock, flags); 244 pin_reg = readl(gpio_dev->base + i * 4); 245 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); 246 247 if (pin_reg & BIT(INTERRUPT_ENABLE_OFF)) { 248 u8 level = (pin_reg >> ACTIVE_LEVEL_OFF) & 249 ACTIVE_LEVEL_MASK; 250 251 if (level == ACTIVE_LEVEL_HIGH) 252 active_level = "���"; 253 else if (level == ACTIVE_LEVEL_LOW) 254 active_level = "���"; 255 else if (!(pin_reg & BIT(LEVEL_TRIG_OFF)) && 256 level == ACTIVE_LEVEL_BOTH) 257 active_level = "b"; 258 else 259 active_level = "?"; 260 261 if (pin_reg & BIT(LEVEL_TRIG_OFF)) 262 level_trig = "level"; 263 else 264 level_trig = " edge"; 265 266 if (pin_reg & BIT(INTERRUPT_MASK_OFF)) 267 interrupt_mask = "����"; 268 else 269 interrupt_mask = "����"; 270 271 if (pin_reg & BIT(INTERRUPT_STS_OFF)) 272 interrupt_sts = "����"; 273 else 274 interrupt_sts = " "; 275 276 seq_printf(s, "%s %s| %s| %s|", 277 interrupt_sts, 278 interrupt_mask, 279 active_level, 280 level_trig); 281 } else 282 seq_puts(s, " ���| | |"); 283 284 if (pin_reg & BIT(WAKE_CNTRL_OFF_S0I3)) 285 wake_cntrl0 = "���"; 286 else 287 wake_cntrl0 = " "; 288 seq_printf(s, " %s| ", wake_cntrl0); 289 290 if (pin_reg & BIT(WAKE_CNTRL_OFF_S3)) 291 wake_cntrl1 = "���"; 292 else 293 wake_cntrl1 = " "; 294 seq_printf(s, "%s|", wake_cntrl1); 295 296 if (pin_reg & BIT(WAKE_CNTRL_OFF_S4)) 297 wake_cntrl2 = "���"; 298 else 299 wake_cntrl2 = " "; 300 seq_printf(s, " %s|", wake_cntrl2); 301 302 if (pin_reg & BIT(WAKECNTRL_Z_OFF)) 303 wake_cntrlz = "���"; 304 else 305 wake_cntrlz = " "; 306 seq_printf(s, "%s|", wake_cntrlz); 307 308 if (pin_reg & BIT(WAKE_STS_OFF)) 309 wake_sts = "����"; 310 else 311 wake_sts = " "; 312 seq_printf(s, " %s|", wake_sts); 313 314 if (pin_reg & BIT(PULL_UP_ENABLE_OFF)) { 315 seq_puts(s, " ��� |"); 316 } else if (pin_reg & BIT(PULL_DOWN_ENABLE_OFF)) { 317 seq_puts(s, " ��� |"); 318 } else { 319 seq_puts(s, " |"); 320 } 321 322 if (pin_reg & BIT(OUTPUT_ENABLE_OFF)) { 323 pin_sts = "output"; 324 if (pin_reg & BIT(OUTPUT_VALUE_OFF)) 325 orientation = "���"; 326 else 327 orientation = "���"; 328 } else { 329 pin_sts = "input "; 330 if (pin_reg & BIT(PIN_STS_OFF)) 331 orientation = "���"; 332 else 333 orientation = "���"; 334 } 335 seq_printf(s, "%s %s|", pin_sts, orientation); 336 337 db_cntrl = (DB_CNTRl_MASK << DB_CNTRL_OFF) & pin_reg; 338 if (db_cntrl) { 339 tmr_out_unit = pin_reg & BIT(DB_TMR_OUT_UNIT_OFF); 340 tmr_large = pin_reg & BIT(DB_TMR_LARGE_OFF); 341 time = pin_reg & DB_TMR_OUT_MASK; 342 if (tmr_large) { 343 if (tmr_out_unit) 344 unit = 62500; 345 else 346 unit = 15625; 347 } else { 348 if (tmr_out_unit) 349 unit = 244; 350 else 351 unit = 61; 352 } 353 if ((DB_TYPE_REMOVE_GLITCH << DB_CNTRL_OFF) == db_cntrl) 354 debounce_enable = "b"; 355 else if ((DB_TYPE_PRESERVE_LOW_GLITCH << DB_CNTRL_OFF) == db_cntrl) 356 debounce_enable = "���"; 357 else 358 debounce_enable = "���"; 359 snprintf(debounce_value, sizeof(debounce_value), "%06u", time * unit); 360 seq_printf(s, "%s (���� %sus)|", debounce_enable, debounce_value); 361 } else { 362 seq_puts(s, " |"); 363 } 364 seq_printf(s, "0x%x\n", pin_reg); 365 } 366 } 367} 368#else 369#define amd_gpio_dbg_show NULL 370#endif 371 372static void amd_gpio_irq_enable(struct irq_data *d) 373{ 374 u32 pin_reg; 375 unsigned long flags; 376 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 377 struct amd_gpio *gpio_dev = gpiochip_get_data(gc); 378 379 gpiochip_enable_irq(gc, d->hwirq); 380 381 raw_spin_lock_irqsave(&gpio_dev->lock, flags); 382 pin_reg = readl(gpio_dev->base + (d->hwirq)*4); 383 pin_reg |= BIT(INTERRUPT_ENABLE_OFF); 384 pin_reg |= BIT(INTERRUPT_MASK_OFF); 385 writel(pin_reg, gpio_dev->base + (d->hwirq)*4); 386 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); 387} 388 389static void amd_gpio_irq_disable(struct irq_data *d) 390{ 391 u32 pin_reg; 392 unsigned long flags; 393 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 394 struct amd_gpio *gpio_dev = gpiochip_get_data(gc); 395 396 raw_spin_lock_irqsave(&gpio_dev->lock, flags); 397 pin_reg = readl(gpio_dev->base + (d->hwirq)*4); 398 pin_reg &= ~BIT(INTERRUPT_ENABLE_OFF); 399 pin_reg &= ~BIT(INTERRUPT_MASK_OFF); 400 writel(pin_reg, gpio_dev->base + (d->hwirq)*4); 401 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); 402 403 gpiochip_disable_irq(gc, d->hwirq); 404} 405 406static void amd_gpio_irq_mask(struct irq_data *d) 407{ 408 u32 pin_reg; 409 unsigned long flags; 410 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 411 struct amd_gpio *gpio_dev = gpiochip_get_data(gc); 412 413 raw_spin_lock_irqsave(&gpio_dev->lock, flags); 414 pin_reg = readl(gpio_dev->base + (d->hwirq)*4); 415 pin_reg &= ~BIT(INTERRUPT_MASK_OFF); 416 writel(pin_reg, gpio_dev->base + (d->hwirq)*4); 417 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); 418} 419 420static void amd_gpio_irq_unmask(struct irq_data *d) 421{ 422 u32 pin_reg; 423 unsigned long flags; 424 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 425 struct amd_gpio *gpio_dev = gpiochip_get_data(gc); 426 427 raw_spin_lock_irqsave(&gpio_dev->lock, flags); 428 pin_reg = readl(gpio_dev->base + (d->hwirq)*4); 429 pin_reg |= BIT(INTERRUPT_MASK_OFF); 430 writel(pin_reg, gpio_dev->base + (d->hwirq)*4); 431 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); 432} 433 434static int amd_gpio_irq_set_wake(struct irq_data *d, unsigned int on) 435{ 436 u32 pin_reg; 437 unsigned long flags; 438 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 439 struct amd_gpio *gpio_dev = gpiochip_get_data(gc); 440 u32 wake_mask = BIT(WAKE_CNTRL_OFF_S0I3) | BIT(WAKE_CNTRL_OFF_S3); 441 int err; 442 443 raw_spin_lock_irqsave(&gpio_dev->lock, flags); 444 pin_reg = readl(gpio_dev->base + (d->hwirq)*4); 445 446 if (on) 447 pin_reg |= wake_mask; 448 else 449 pin_reg &= ~wake_mask; 450 451 writel(pin_reg, gpio_dev->base + (d->hwirq)*4); 452 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); 453 454 if (on) 455 err = enable_irq_wake(gpio_dev->irq); 456 else 457 err = disable_irq_wake(gpio_dev->irq); 458 459 if (err) 460 dev_err(&gpio_dev->pdev->dev, "failed to %s wake-up interrupt\n", 461 on ? "enable" : "disable"); 462 463 return 0; 464} 465 466static void amd_gpio_irq_eoi(struct irq_data *d) 467{ 468 u32 reg; 469 unsigned long flags; 470 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 471 struct amd_gpio *gpio_dev = gpiochip_get_data(gc); 472 473 raw_spin_lock_irqsave(&gpio_dev->lock, flags); 474 reg = readl(gpio_dev->base + WAKE_INT_MASTER_REG); 475 reg |= EOI_MASK; 476 writel(reg, gpio_dev->base + WAKE_INT_MASTER_REG); 477 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); 478} 479 480static int amd_gpio_irq_set_type(struct irq_data *d, unsigned int type) 481{ 482 int ret = 0; 483 u32 pin_reg, pin_reg_irq_en, mask; 484 unsigned long flags; 485 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 486 struct amd_gpio *gpio_dev = gpiochip_get_data(gc); 487 488 raw_spin_lock_irqsave(&gpio_dev->lock, flags); 489 pin_reg = readl(gpio_dev->base + (d->hwirq)*4); 490 491 switch (type & IRQ_TYPE_SENSE_MASK) { 492 case IRQ_TYPE_EDGE_RISING: 493 pin_reg &= ~BIT(LEVEL_TRIG_OFF); 494 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF); 495 pin_reg |= ACTIVE_HIGH << ACTIVE_LEVEL_OFF; 496 irq_set_handler_locked(d, handle_edge_irq); 497 break; 498 499 case IRQ_TYPE_EDGE_FALLING: 500 pin_reg &= ~BIT(LEVEL_TRIG_OFF); 501 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF); 502 pin_reg |= ACTIVE_LOW << ACTIVE_LEVEL_OFF; 503 irq_set_handler_locked(d, handle_edge_irq); 504 break; 505 506 case IRQ_TYPE_EDGE_BOTH: 507 pin_reg &= ~BIT(LEVEL_TRIG_OFF); 508 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF); 509 pin_reg |= BOTH_EADGE << ACTIVE_LEVEL_OFF; 510 irq_set_handler_locked(d, handle_edge_irq); 511 break; 512 513 case IRQ_TYPE_LEVEL_HIGH: 514 pin_reg |= LEVEL_TRIGGER << LEVEL_TRIG_OFF; 515 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF); 516 pin_reg |= ACTIVE_HIGH << ACTIVE_LEVEL_OFF; 517 irq_set_handler_locked(d, handle_level_irq); 518 break; 519 520 case IRQ_TYPE_LEVEL_LOW: 521 pin_reg |= LEVEL_TRIGGER << LEVEL_TRIG_OFF; 522 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF); 523 pin_reg |= ACTIVE_LOW << ACTIVE_LEVEL_OFF; 524 irq_set_handler_locked(d, handle_level_irq); 525 break; 526 527 case IRQ_TYPE_NONE: 528 break; 529 530 default: 531 dev_err(&gpio_dev->pdev->dev, "Invalid type value\n"); 532 ret = -EINVAL; 533 } 534 535 pin_reg |= CLR_INTR_STAT << INTERRUPT_STS_OFF; 536 /* 537 * If WAKE_INT_MASTER_REG.MaskStsEn is set, a software write to the 538 * debounce registers of any GPIO will block wake/interrupt status 539 * generation for *all* GPIOs for a length of time that depends on 540 * WAKE_INT_MASTER_REG.MaskStsLength[11:0]. During this period the 541 * INTERRUPT_ENABLE bit will read as 0. 542 * 543 * We temporarily enable irq for the GPIO whose configuration is 544 * changing, and then wait for it to read back as 1 to know when 545 * debounce has settled and then disable the irq again. 546 * We do this polling with the spinlock held to ensure other GPIO 547 * access routines do not read an incorrect value for the irq enable 548 * bit of other GPIOs. We keep the GPIO masked while polling to avoid 549 * spurious irqs, and disable the irq again after polling. 550 */ 551 mask = BIT(INTERRUPT_ENABLE_OFF); 552 pin_reg_irq_en = pin_reg; 553 pin_reg_irq_en |= mask; 554 pin_reg_irq_en &= ~BIT(INTERRUPT_MASK_OFF); 555 writel(pin_reg_irq_en, gpio_dev->base + (d->hwirq)*4); 556 while ((readl(gpio_dev->base + (d->hwirq)*4) & mask) != mask) 557 continue; 558 writel(pin_reg, gpio_dev->base + (d->hwirq)*4); 559 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); 560 561 return ret; 562} 563 564static void amd_irq_ack(struct irq_data *d) 565{ 566 /* 567 * based on HW design,there is no need to ack HW 568 * before handle current irq. But this routine is 569 * necessary for handle_edge_irq 570 */ 571} 572 573static const struct irq_chip amd_gpio_irqchip = { 574 .name = "amd_gpio", 575 .irq_ack = amd_irq_ack, 576 .irq_enable = amd_gpio_irq_enable, 577 .irq_disable = amd_gpio_irq_disable, 578 .irq_mask = amd_gpio_irq_mask, 579 .irq_unmask = amd_gpio_irq_unmask, 580 .irq_set_wake = amd_gpio_irq_set_wake, 581 .irq_eoi = amd_gpio_irq_eoi, 582 .irq_set_type = amd_gpio_irq_set_type, 583 /* 584 * We need to set IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND so that a wake event 585 * also generates an IRQ. We need the IRQ so the irq_handler can clear 586 * the wake event. Otherwise the wake event will never clear and 587 * prevent the system from suspending. 588 */ 589 .flags = IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND | IRQCHIP_IMMUTABLE, 590 GPIOCHIP_IRQ_RESOURCE_HELPERS, 591}; 592 593#define PIN_IRQ_PENDING (BIT(INTERRUPT_STS_OFF) | BIT(WAKE_STS_OFF)) 594 595static bool do_amd_gpio_irq_handler(int irq, void *dev_id) 596{ 597 struct amd_gpio *gpio_dev = dev_id; 598 struct gpio_chip *gc = &gpio_dev->gc; 599 unsigned int i, irqnr; 600 unsigned long flags; 601 u32 __iomem *regs; 602 bool ret = false; 603 u32 regval; 604 u64 status, mask; 605 606 /* Read the wake status */ 607 raw_spin_lock_irqsave(&gpio_dev->lock, flags); 608 status = readl(gpio_dev->base + WAKE_INT_STATUS_REG1); 609 status <<= 32; 610 status |= readl(gpio_dev->base + WAKE_INT_STATUS_REG0); 611 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); 612 613 /* Bit 0-45 contain the relevant status bits */ 614 status &= (1ULL << 46) - 1; 615 regs = gpio_dev->base; 616 for (mask = 1, irqnr = 0; status; mask <<= 1, regs += 4, irqnr += 4) { 617 if (!(status & mask)) 618 continue; 619 status &= ~mask; 620 621 /* Each status bit covers four pins */ 622 for (i = 0; i < 4; i++) { 623 regval = readl(regs + i); 624 625 if (regval & PIN_IRQ_PENDING) 626 pm_pr_dbg("GPIO %d is active: 0x%x", 627 irqnr + i, regval); 628 629 /* caused wake on resume context for shared IRQ */ 630 if (irq < 0 && (regval & BIT(WAKE_STS_OFF))) 631 return true; 632 633 if (!(regval & PIN_IRQ_PENDING) || 634 !(regval & BIT(INTERRUPT_MASK_OFF))) 635 continue; 636 generic_handle_domain_irq_safe(gc->irq.domain, irqnr + i); 637 638 /* Clear interrupt. 639 * We must read the pin register again, in case the 640 * value was changed while executing 641 * generic_handle_domain_irq() above. 642 * If the line is not an irq, disable it in order to 643 * avoid a system hang caused by an interrupt storm. 644 */ 645 raw_spin_lock_irqsave(&gpio_dev->lock, flags); 646 regval = readl(regs + i); 647 if (!gpiochip_line_is_irq(gc, irqnr + i)) { 648 regval &= ~BIT(INTERRUPT_MASK_OFF); 649 dev_dbg(&gpio_dev->pdev->dev, 650 "Disabling spurious GPIO IRQ %d\n", 651 irqnr + i); 652 } else { 653 ret = true; 654 } 655 writel(regval, regs + i); 656 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); 657 } 658 } 659 /* did not cause wake on resume context for shared IRQ */ 660 if (irq < 0) 661 return false; 662 663 /* Signal EOI to the GPIO unit */ 664 raw_spin_lock_irqsave(&gpio_dev->lock, flags); 665 regval = readl(gpio_dev->base + WAKE_INT_MASTER_REG); 666 regval |= EOI_MASK; 667 writel(regval, gpio_dev->base + WAKE_INT_MASTER_REG); 668 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); 669 670 return ret; 671} 672 673static irqreturn_t amd_gpio_irq_handler(int irq, void *dev_id) 674{ 675 return IRQ_RETVAL(do_amd_gpio_irq_handler(irq, dev_id)); 676} 677 678static bool __maybe_unused amd_gpio_check_wake(void *dev_id) 679{ 680 return do_amd_gpio_irq_handler(-1, dev_id); 681} 682 683static int amd_get_groups_count(struct pinctrl_dev *pctldev) 684{ 685 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev); 686 687 return gpio_dev->ngroups; 688} 689 690static const char *amd_get_group_name(struct pinctrl_dev *pctldev, 691 unsigned group) 692{ 693 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev); 694 695 return gpio_dev->groups[group].name; 696} 697 698static int amd_get_group_pins(struct pinctrl_dev *pctldev, 699 unsigned group, 700 const unsigned **pins, 701 unsigned *num_pins) 702{ 703 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev); 704 705 *pins = gpio_dev->groups[group].pins; 706 *num_pins = gpio_dev->groups[group].npins; 707 return 0; 708} 709 710static const struct pinctrl_ops amd_pinctrl_ops = { 711 .get_groups_count = amd_get_groups_count, 712 .get_group_name = amd_get_group_name, 713 .get_group_pins = amd_get_group_pins, 714#ifdef CONFIG_OF 715 .dt_node_to_map = pinconf_generic_dt_node_to_map_group, 716 .dt_free_map = pinctrl_utils_free_map, 717#endif 718}; 719 720static int amd_pinconf_get(struct pinctrl_dev *pctldev, 721 unsigned int pin, 722 unsigned long *config) 723{ 724 u32 pin_reg; 725 unsigned arg; 726 unsigned long flags; 727 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev); 728 enum pin_config_param param = pinconf_to_config_param(*config); 729 730 raw_spin_lock_irqsave(&gpio_dev->lock, flags); 731 pin_reg = readl(gpio_dev->base + pin*4); 732 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); 733 switch (param) { 734 case PIN_CONFIG_INPUT_DEBOUNCE: 735 arg = pin_reg & DB_TMR_OUT_MASK; 736 break; 737 738 case PIN_CONFIG_BIAS_PULL_DOWN: 739 arg = (pin_reg >> PULL_DOWN_ENABLE_OFF) & BIT(0); 740 break; 741 742 case PIN_CONFIG_BIAS_PULL_UP: 743 arg = (pin_reg >> PULL_UP_ENABLE_OFF) & BIT(0); 744 break; 745 746 case PIN_CONFIG_DRIVE_STRENGTH: 747 arg = (pin_reg >> DRV_STRENGTH_SEL_OFF) & DRV_STRENGTH_SEL_MASK; 748 break; 749 750 default: 751 dev_dbg(&gpio_dev->pdev->dev, "Invalid config param %04x\n", 752 param); 753 return -ENOTSUPP; 754 } 755 756 *config = pinconf_to_config_packed(param, arg); 757 758 return 0; 759} 760 761static int amd_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin, 762 unsigned long *configs, unsigned int num_configs) 763{ 764 int i; 765 u32 arg; 766 int ret = 0; 767 u32 pin_reg; 768 unsigned long flags; 769 enum pin_config_param param; 770 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev); 771 772 raw_spin_lock_irqsave(&gpio_dev->lock, flags); 773 for (i = 0; i < num_configs; i++) { 774 param = pinconf_to_config_param(configs[i]); 775 arg = pinconf_to_config_argument(configs[i]); 776 pin_reg = readl(gpio_dev->base + pin*4); 777 778 switch (param) { 779 case PIN_CONFIG_INPUT_DEBOUNCE: 780 ret = amd_gpio_set_debounce(gpio_dev, pin, arg); 781 goto out_unlock; 782 783 case PIN_CONFIG_BIAS_PULL_DOWN: 784 pin_reg &= ~BIT(PULL_DOWN_ENABLE_OFF); 785 pin_reg |= (arg & BIT(0)) << PULL_DOWN_ENABLE_OFF; 786 break; 787 788 case PIN_CONFIG_BIAS_PULL_UP: 789 pin_reg &= ~BIT(PULL_UP_ENABLE_OFF); 790 pin_reg |= (arg & BIT(0)) << PULL_UP_ENABLE_OFF; 791 break; 792 793 case PIN_CONFIG_DRIVE_STRENGTH: 794 pin_reg &= ~(DRV_STRENGTH_SEL_MASK 795 << DRV_STRENGTH_SEL_OFF); 796 pin_reg |= (arg & DRV_STRENGTH_SEL_MASK) 797 << DRV_STRENGTH_SEL_OFF; 798 break; 799 800 default: 801 dev_dbg(&gpio_dev->pdev->dev, 802 "Invalid config param %04x\n", param); 803 ret = -ENOTSUPP; 804 } 805 806 writel(pin_reg, gpio_dev->base + pin*4); 807 } 808out_unlock: 809 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); 810 811 return ret; 812} 813 814static int amd_pinconf_group_get(struct pinctrl_dev *pctldev, 815 unsigned int group, 816 unsigned long *config) 817{ 818 const unsigned *pins; 819 unsigned npins; 820 int ret; 821 822 ret = amd_get_group_pins(pctldev, group, &pins, &npins); 823 if (ret) 824 return ret; 825 826 if (amd_pinconf_get(pctldev, pins[0], config)) 827 return -ENOTSUPP; 828 829 return 0; 830} 831 832static int amd_pinconf_group_set(struct pinctrl_dev *pctldev, 833 unsigned group, unsigned long *configs, 834 unsigned num_configs) 835{ 836 const unsigned *pins; 837 unsigned npins; 838 int i, ret; 839 840 ret = amd_get_group_pins(pctldev, group, &pins, &npins); 841 if (ret) 842 return ret; 843 for (i = 0; i < npins; i++) { 844 if (amd_pinconf_set(pctldev, pins[i], configs, num_configs)) 845 return -ENOTSUPP; 846 } 847 return 0; 848} 849 850static int amd_gpio_set_config(struct gpio_chip *gc, unsigned int pin, 851 unsigned long config) 852{ 853 struct amd_gpio *gpio_dev = gpiochip_get_data(gc); 854 855 return amd_pinconf_set(gpio_dev->pctrl, pin, &config, 1); 856} 857 858static const struct pinconf_ops amd_pinconf_ops = { 859 .pin_config_get = amd_pinconf_get, 860 .pin_config_set = amd_pinconf_set, 861 .pin_config_group_get = amd_pinconf_group_get, 862 .pin_config_group_set = amd_pinconf_group_set, 863}; 864 865static void amd_gpio_irq_init(struct amd_gpio *gpio_dev) 866{ 867 struct pinctrl_desc *desc = gpio_dev->pctrl->desc; 868 unsigned long flags; 869 u32 pin_reg, mask; 870 int i; 871 872 mask = BIT(WAKE_CNTRL_OFF_S0I3) | BIT(WAKE_CNTRL_OFF_S3) | 873 BIT(WAKE_CNTRL_OFF_S4); 874 875 for (i = 0; i < desc->npins; i++) { 876 int pin = desc->pins[i].number; 877 const struct pin_desc *pd = pin_desc_get(gpio_dev->pctrl, pin); 878 879 if (!pd) 880 continue; 881 882 raw_spin_lock_irqsave(&gpio_dev->lock, flags); 883 884 pin_reg = readl(gpio_dev->base + pin * 4); 885 pin_reg &= ~mask; 886 writel(pin_reg, gpio_dev->base + pin * 4); 887 888 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); 889 } 890} 891 892#ifdef CONFIG_PM_SLEEP 893static bool amd_gpio_should_save(struct amd_gpio *gpio_dev, unsigned int pin) 894{ 895 const struct pin_desc *pd = pin_desc_get(gpio_dev->pctrl, pin); 896 897 if (!pd) 898 return false; 899 900 /* 901 * Only restore the pin if it is actually in use by the kernel (or 902 * by userspace). 903 */ 904 if (pd->mux_owner || pd->gpio_owner || 905 gpiochip_line_is_irq(&gpio_dev->gc, pin)) 906 return true; 907 908 return false; 909} 910 911static int amd_gpio_suspend(struct device *dev) 912{ 913 struct amd_gpio *gpio_dev = dev_get_drvdata(dev); 914 struct pinctrl_desc *desc = gpio_dev->pctrl->desc; 915 unsigned long flags; 916 int i; 917 918 for (i = 0; i < desc->npins; i++) { 919 int pin = desc->pins[i].number; 920 921 if (!amd_gpio_should_save(gpio_dev, pin)) 922 continue; 923 924 raw_spin_lock_irqsave(&gpio_dev->lock, flags); 925 gpio_dev->saved_regs[i] = readl(gpio_dev->base + pin * 4) & ~PIN_IRQ_PENDING; 926 927 /* mask any interrupts not intended to be a wake source */ 928 if (!(gpio_dev->saved_regs[i] & WAKE_SOURCE)) { 929 writel(gpio_dev->saved_regs[i] & ~BIT(INTERRUPT_MASK_OFF), 930 gpio_dev->base + pin * 4); 931 pm_pr_dbg("Disabling GPIO #%d interrupt for suspend.\n", 932 pin); 933 } 934 935 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); 936 } 937 938 return 0; 939} 940 941static int amd_gpio_resume(struct device *dev) 942{ 943 struct amd_gpio *gpio_dev = dev_get_drvdata(dev); 944 struct pinctrl_desc *desc = gpio_dev->pctrl->desc; 945 unsigned long flags; 946 int i; 947 948 for (i = 0; i < desc->npins; i++) { 949 int pin = desc->pins[i].number; 950 951 if (!amd_gpio_should_save(gpio_dev, pin)) 952 continue; 953 954 raw_spin_lock_irqsave(&gpio_dev->lock, flags); 955 gpio_dev->saved_regs[i] |= readl(gpio_dev->base + pin * 4) & PIN_IRQ_PENDING; 956 writel(gpio_dev->saved_regs[i], gpio_dev->base + pin * 4); 957 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); 958 } 959 960 return 0; 961} 962 963static const struct dev_pm_ops amd_gpio_pm_ops = { 964 SET_LATE_SYSTEM_SLEEP_PM_OPS(amd_gpio_suspend, 965 amd_gpio_resume) 966}; 967#endif 968 969static int amd_get_functions_count(struct pinctrl_dev *pctldev) 970{ 971 return ARRAY_SIZE(pmx_functions); 972} 973 974static const char *amd_get_fname(struct pinctrl_dev *pctrldev, unsigned int selector) 975{ 976 return pmx_functions[selector].name; 977} 978 979static int amd_get_groups(struct pinctrl_dev *pctrldev, unsigned int selector, 980 const char * const **groups, 981 unsigned int * const num_groups) 982{ 983 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctrldev); 984 985 if (!gpio_dev->iomux_base) { 986 dev_err(&gpio_dev->pdev->dev, "iomux function %d group not supported\n", selector); 987 return -EINVAL; 988 } 989 990 *groups = pmx_functions[selector].groups; 991 *num_groups = pmx_functions[selector].ngroups; 992 return 0; 993} 994 995static int amd_set_mux(struct pinctrl_dev *pctrldev, unsigned int function, unsigned int group) 996{ 997 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctrldev); 998 struct device *dev = &gpio_dev->pdev->dev; 999 struct pin_desc *pd; 1000 int ind, index; 1001 1002 if (!gpio_dev->iomux_base) 1003 return -EINVAL; 1004 1005 for (index = 0; index < NSELECTS; index++) { 1006 if (strcmp(gpio_dev->groups[group].name, pmx_functions[function].groups[index])) 1007 continue; 1008 1009 if (readb(gpio_dev->iomux_base + pmx_functions[function].index) == 1010 FUNCTION_INVALID) { 1011 dev_err(dev, "IOMUX_GPIO 0x%x not present or supported\n", 1012 pmx_functions[function].index); 1013 return -EINVAL; 1014 } 1015 1016 writeb(index, gpio_dev->iomux_base + pmx_functions[function].index); 1017 1018 if (index != (readb(gpio_dev->iomux_base + pmx_functions[function].index) & 1019 FUNCTION_MASK)) { 1020 dev_err(dev, "IOMUX_GPIO 0x%x not present or supported\n", 1021 pmx_functions[function].index); 1022 return -EINVAL; 1023 } 1024 1025 for (ind = 0; ind < gpio_dev->groups[group].npins; ind++) { 1026 if (strncmp(gpio_dev->groups[group].name, "IMX_F", strlen("IMX_F"))) 1027 continue; 1028 1029 pd = pin_desc_get(gpio_dev->pctrl, gpio_dev->groups[group].pins[ind]); 1030 pd->mux_owner = gpio_dev->groups[group].name; 1031 } 1032 break; 1033 } 1034 1035 return 0; 1036} 1037 1038static const struct pinmux_ops amd_pmxops = { 1039 .get_functions_count = amd_get_functions_count, 1040 .get_function_name = amd_get_fname, 1041 .get_function_groups = amd_get_groups, 1042 .set_mux = amd_set_mux, 1043}; 1044 1045static struct pinctrl_desc amd_pinctrl_desc = { 1046 .pins = kerncz_pins, 1047 .npins = ARRAY_SIZE(kerncz_pins), 1048 .pctlops = &amd_pinctrl_ops, 1049 .pmxops = &amd_pmxops, 1050 .confops = &amd_pinconf_ops, 1051 .owner = THIS_MODULE, 1052}; 1053 1054static void amd_get_iomux_res(struct amd_gpio *gpio_dev) 1055{ 1056 struct pinctrl_desc *desc = &amd_pinctrl_desc; 1057 struct device *dev = &gpio_dev->pdev->dev; 1058 int index; 1059 1060 index = device_property_match_string(dev, "pinctrl-resource-names", "iomux"); 1061 if (index < 0) { 1062 dev_dbg(dev, "iomux not supported\n"); 1063 goto out_no_pinmux; 1064 } 1065 1066 gpio_dev->iomux_base = devm_platform_ioremap_resource(gpio_dev->pdev, index); 1067 if (IS_ERR(gpio_dev->iomux_base)) { 1068 dev_dbg(dev, "iomux not supported %d io resource\n", index); 1069 goto out_no_pinmux; 1070 } 1071 1072 return; 1073 1074out_no_pinmux: 1075 desc->pmxops = NULL; 1076} 1077 1078static int amd_gpio_probe(struct platform_device *pdev) 1079{ 1080 int ret = 0; 1081 struct resource *res; 1082 struct amd_gpio *gpio_dev; 1083 struct gpio_irq_chip *girq; 1084 1085 gpio_dev = devm_kzalloc(&pdev->dev, 1086 sizeof(struct amd_gpio), GFP_KERNEL); 1087 if (!gpio_dev) 1088 return -ENOMEM; 1089 1090 raw_spin_lock_init(&gpio_dev->lock); 1091 1092 gpio_dev->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res); 1093 if (IS_ERR(gpio_dev->base)) { 1094 dev_err(&pdev->dev, "Failed to get gpio io resource.\n"); 1095 return PTR_ERR(gpio_dev->base); 1096 } 1097 1098 gpio_dev->irq = platform_get_irq(pdev, 0); 1099 if (gpio_dev->irq < 0) 1100 return gpio_dev->irq; 1101 1102#ifdef CONFIG_PM_SLEEP 1103 gpio_dev->saved_regs = devm_kcalloc(&pdev->dev, amd_pinctrl_desc.npins, 1104 sizeof(*gpio_dev->saved_regs), 1105 GFP_KERNEL); 1106 if (!gpio_dev->saved_regs) 1107 return -ENOMEM; 1108#endif 1109 1110 gpio_dev->pdev = pdev; 1111 gpio_dev->gc.get_direction = amd_gpio_get_direction; 1112 gpio_dev->gc.direction_input = amd_gpio_direction_input; 1113 gpio_dev->gc.direction_output = amd_gpio_direction_output; 1114 gpio_dev->gc.get = amd_gpio_get_value; 1115 gpio_dev->gc.set = amd_gpio_set_value; 1116 gpio_dev->gc.set_config = amd_gpio_set_config; 1117 gpio_dev->gc.dbg_show = amd_gpio_dbg_show; 1118 1119 gpio_dev->gc.base = -1; 1120 gpio_dev->gc.label = pdev->name; 1121 gpio_dev->gc.owner = THIS_MODULE; 1122 gpio_dev->gc.parent = &pdev->dev; 1123 gpio_dev->gc.ngpio = resource_size(res) / 4; 1124 1125 gpio_dev->hwbank_num = gpio_dev->gc.ngpio / 64; 1126 gpio_dev->groups = kerncz_groups; 1127 gpio_dev->ngroups = ARRAY_SIZE(kerncz_groups); 1128 1129 amd_pinctrl_desc.name = dev_name(&pdev->dev); 1130 amd_get_iomux_res(gpio_dev); 1131 gpio_dev->pctrl = devm_pinctrl_register(&pdev->dev, &amd_pinctrl_desc, 1132 gpio_dev); 1133 if (IS_ERR(gpio_dev->pctrl)) { 1134 dev_err(&pdev->dev, "Couldn't register pinctrl driver\n"); 1135 return PTR_ERR(gpio_dev->pctrl); 1136 } 1137 1138 /* Disable and mask interrupts */ 1139 amd_gpio_irq_init(gpio_dev); 1140 1141 girq = &gpio_dev->gc.irq; 1142 gpio_irq_chip_set_chip(girq, &amd_gpio_irqchip); 1143 /* This will let us handle the parent IRQ in the driver */ 1144 girq->parent_handler = NULL; 1145 girq->num_parents = 0; 1146 girq->parents = NULL; 1147 girq->default_type = IRQ_TYPE_NONE; 1148 girq->handler = handle_simple_irq; 1149 1150 ret = gpiochip_add_data(&gpio_dev->gc, gpio_dev); 1151 if (ret) 1152 return ret; 1153 1154 ret = gpiochip_add_pin_range(&gpio_dev->gc, dev_name(&pdev->dev), 1155 0, 0, gpio_dev->gc.ngpio); 1156 if (ret) { 1157 dev_err(&pdev->dev, "Failed to add pin range\n"); 1158 goto out2; 1159 } 1160 1161 ret = devm_request_irq(&pdev->dev, gpio_dev->irq, amd_gpio_irq_handler, 1162 IRQF_SHARED | IRQF_COND_ONESHOT, KBUILD_MODNAME, gpio_dev); 1163 if (ret) 1164 goto out2; 1165 1166 platform_set_drvdata(pdev, gpio_dev); 1167 acpi_register_wakeup_handler(gpio_dev->irq, amd_gpio_check_wake, gpio_dev); 1168 1169 dev_dbg(&pdev->dev, "amd gpio driver loaded\n"); 1170 return ret; 1171 1172out2: 1173 gpiochip_remove(&gpio_dev->gc); 1174 1175 return ret; 1176} 1177 1178static void amd_gpio_remove(struct platform_device *pdev) 1179{ 1180 struct amd_gpio *gpio_dev; 1181 1182 gpio_dev = platform_get_drvdata(pdev); 1183 1184 gpiochip_remove(&gpio_dev->gc); 1185 acpi_unregister_wakeup_handler(amd_gpio_check_wake, gpio_dev); 1186} 1187 1188#ifdef CONFIG_ACPI 1189static const struct acpi_device_id amd_gpio_acpi_match[] = { 1190 { "AMD0030", 0 }, 1191 { "AMDI0030", 0}, 1192 { "AMDI0031", 0}, 1193 { }, 1194}; 1195MODULE_DEVICE_TABLE(acpi, amd_gpio_acpi_match); 1196#endif 1197 1198static struct platform_driver amd_gpio_driver = { 1199 .driver = { 1200 .name = "amd_gpio", 1201 .acpi_match_table = ACPI_PTR(amd_gpio_acpi_match), 1202#ifdef CONFIG_PM_SLEEP 1203 .pm = &amd_gpio_pm_ops, 1204#endif 1205 }, 1206 .probe = amd_gpio_probe, 1207 .remove_new = amd_gpio_remove, 1208}; 1209 1210module_platform_driver(amd_gpio_driver); 1211 1212MODULE_AUTHOR("Ken Xue <Ken.Xue@amd.com>, Jeff Wu <Jeff.Wu@amd.com>"); 1213MODULE_DESCRIPTION("AMD GPIO pinctrl driver"); 1214