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 34 #include "core.h" 35 #include "pinctrl-utils.h" 36 #include "pinctrl-amd.h" 37 38 static int amd_gpio_get_direction(struct gpio_chip *gc, unsigned offset) 39 { 40 unsigned long flags; 41 u32 pin_reg; 42 struct amd_gpio *gpio_dev = gpiochip_get_data(gc); 43 44 raw_spin_lock_irqsave(&gpio_dev->lock, flags); 45 pin_reg = readl(gpio_dev->base + offset * 4); 46 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); 47 48 if (pin_reg & BIT(OUTPUT_ENABLE_OFF)) 49 return GPIO_LINE_DIRECTION_OUT; 50 51 return GPIO_LINE_DIRECTION_IN; 52 } 53 54 static int amd_gpio_direction_input(struct gpio_chip *gc, unsigned offset) 55 { 56 unsigned long flags; 57 u32 pin_reg; 58 struct amd_gpio *gpio_dev = gpiochip_get_data(gc); 59 60 raw_spin_lock_irqsave(&gpio_dev->lock, flags); 61 pin_reg = readl(gpio_dev->base + offset * 4); 62 pin_reg &= ~BIT(OUTPUT_ENABLE_OFF); 63 writel(pin_reg, gpio_dev->base + offset * 4); 64 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); 65 66 return 0; 67 } 68 69 static int amd_gpio_direction_output(struct gpio_chip *gc, unsigned offset, 70 int value) 71 { 72 u32 pin_reg; 73 unsigned long flags; 74 struct amd_gpio *gpio_dev = gpiochip_get_data(gc); 75 76 raw_spin_lock_irqsave(&gpio_dev->lock, flags); 77 pin_reg = readl(gpio_dev->base + offset * 4); 78 pin_reg |= BIT(OUTPUT_ENABLE_OFF); 79 if (value) 80 pin_reg |= BIT(OUTPUT_VALUE_OFF); 81 else 82 pin_reg &= ~BIT(OUTPUT_VALUE_OFF); 83 writel(pin_reg, gpio_dev->base + offset * 4); 84 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); 85 86 return 0; 87 } 88 89 static int amd_gpio_get_value(struct gpio_chip *gc, unsigned offset) 90 { 91 u32 pin_reg; 92 unsigned long flags; 93 struct amd_gpio *gpio_dev = gpiochip_get_data(gc); 94 95 raw_spin_lock_irqsave(&gpio_dev->lock, flags); 96 pin_reg = readl(gpio_dev->base + offset * 4); 97 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); 98 99 return !!(pin_reg & BIT(PIN_STS_OFF)); 100 } 101 102 static void amd_gpio_set_value(struct gpio_chip *gc, unsigned offset, int value) 103 { 104 u32 pin_reg; 105 unsigned long flags; 106 struct amd_gpio *gpio_dev = gpiochip_get_data(gc); 107 108 raw_spin_lock_irqsave(&gpio_dev->lock, flags); 109 pin_reg = readl(gpio_dev->base + offset * 4); 110 if (value) 111 pin_reg |= BIT(OUTPUT_VALUE_OFF); 112 else 113 pin_reg &= ~BIT(OUTPUT_VALUE_OFF); 114 writel(pin_reg, gpio_dev->base + offset * 4); 115 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); 116 } 117 118 static int amd_gpio_set_debounce(struct gpio_chip *gc, unsigned offset, 119 unsigned debounce) 120 { 121 u32 time; 122 u32 pin_reg; 123 int ret = 0; 124 unsigned long flags; 125 struct amd_gpio *gpio_dev = gpiochip_get_data(gc); 126 127 raw_spin_lock_irqsave(&gpio_dev->lock, flags); 128 pin_reg = readl(gpio_dev->base + offset * 4); 129 130 if (debounce) { 131 pin_reg |= DB_TYPE_REMOVE_GLITCH << DB_CNTRL_OFF; 132 pin_reg &= ~DB_TMR_OUT_MASK; 133 /* 134 Debounce Debounce Timer Max 135 TmrLarge TmrOutUnit Unit Debounce 136 Time 137 0 0 61 usec (2 RtcClk) 976 usec 138 0 1 244 usec (8 RtcClk) 3.9 msec 139 1 0 15.6 msec (512 RtcClk) 250 msec 140 1 1 62.5 msec (2048 RtcClk) 1 sec 141 */ 142 143 if (debounce < 61) { 144 pin_reg |= 1; 145 pin_reg &= ~BIT(DB_TMR_OUT_UNIT_OFF); 146 pin_reg &= ~BIT(DB_TMR_LARGE_OFF); 147 } else if (debounce < 976) { 148 time = debounce / 61; 149 pin_reg |= time & DB_TMR_OUT_MASK; 150 pin_reg &= ~BIT(DB_TMR_OUT_UNIT_OFF); 151 pin_reg &= ~BIT(DB_TMR_LARGE_OFF); 152 } else if (debounce < 3900) { 153 time = debounce / 244; 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 < 250000) { 158 time = debounce / 15625; 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 < 1000000) { 163 time = debounce / 62500; 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 { 168 pin_reg &= ~(DB_CNTRl_MASK << DB_CNTRL_OFF); 169 ret = -EINVAL; 170 } 171 } else { 172 pin_reg &= ~BIT(DB_TMR_OUT_UNIT_OFF); 173 pin_reg &= ~BIT(DB_TMR_LARGE_OFF); 174 pin_reg &= ~DB_TMR_OUT_MASK; 175 pin_reg &= ~(DB_CNTRl_MASK << DB_CNTRL_OFF); 176 } 177 writel(pin_reg, gpio_dev->base + offset * 4); 178 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); 179 180 return ret; 181 } 182 183 static int amd_gpio_set_config(struct gpio_chip *gc, unsigned offset, 184 unsigned long config) 185 { 186 u32 debounce; 187 188 if (pinconf_to_config_param(config) != PIN_CONFIG_INPUT_DEBOUNCE) 189 return -ENOTSUPP; 190 191 debounce = pinconf_to_config_argument(config); 192 return amd_gpio_set_debounce(gc, offset, debounce); 193 } 194 195 #ifdef CONFIG_DEBUG_FS 196 static void amd_gpio_dbg_show(struct seq_file *s, struct gpio_chip *gc) 197 { 198 u32 pin_reg; 199 u32 db_cntrl; 200 unsigned long flags; 201 unsigned int bank, i, pin_num; 202 struct amd_gpio *gpio_dev = gpiochip_get_data(gc); 203 204 bool tmr_out_unit; 205 bool tmr_large; 206 207 char *level_trig; 208 char *active_level; 209 char *interrupt_enable; 210 char *interrupt_mask; 211 char *wake_cntrl0; 212 char *wake_cntrl1; 213 char *wake_cntrl2; 214 char *pin_sts; 215 char *pull_up_sel; 216 char *pull_up_enable; 217 char *pull_down_enable; 218 char *orientation; 219 char debounce_value[40]; 220 char *debounce_enable; 221 222 for (bank = 0; bank < gpio_dev->hwbank_num; bank++) { 223 unsigned int time = 0; 224 unsigned int unit = 0; 225 226 switch (bank) { 227 case 0: 228 i = 0; 229 pin_num = AMD_GPIO_PINS_BANK0; 230 break; 231 case 1: 232 i = 64; 233 pin_num = AMD_GPIO_PINS_BANK1 + i; 234 break; 235 case 2: 236 i = 128; 237 pin_num = AMD_GPIO_PINS_BANK2 + i; 238 break; 239 case 3: 240 i = 192; 241 pin_num = AMD_GPIO_PINS_BANK3 + i; 242 break; 243 default: 244 /* Illegal bank number, ignore */ 245 continue; 246 } 247 seq_printf(s, "GPIO bank%d\n", bank); 248 for (; i < pin_num; i++) { 249 seq_printf(s, "��%d\t", i); 250 raw_spin_lock_irqsave(&gpio_dev->lock, flags); 251 pin_reg = readl(gpio_dev->base + i * 4); 252 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); 253 254 if (pin_reg & BIT(INTERRUPT_ENABLE_OFF)) { 255 u8 level = (pin_reg >> ACTIVE_LEVEL_OFF) & 256 ACTIVE_LEVEL_MASK; 257 interrupt_enable = "+"; 258 259 if (level == ACTIVE_LEVEL_HIGH) 260 active_level = "↑"; 261 else if (level == ACTIVE_LEVEL_LOW) 262 active_level = "↓"; 263 else if (!(pin_reg & BIT(LEVEL_TRIG_OFF)) && 264 level == ACTIVE_LEVEL_BOTH) 265 active_level = "b"; 266 else 267 active_level = "?"; 268 269 if (pin_reg & BIT(LEVEL_TRIG_OFF)) 270 level_trig = "level"; 271 else 272 level_trig = " edge"; 273 274 } else { 275 interrupt_enable = "∅"; 276 active_level = "∅"; 277 level_trig = " ∅"; 278 } 279 280 if (pin_reg & BIT(INTERRUPT_MASK_OFF)) 281 interrupt_mask = "-"; 282 else 283 interrupt_mask = "+"; 284 seq_printf(s, "int %s (�� %s)| active-%s| %s-��| ", 285 interrupt_enable, 286 interrupt_mask, 287 active_level, 288 level_trig); 289 290 if (pin_reg & BIT(WAKE_CNTRL_OFF_S0I3)) 291 wake_cntrl0 = "+"; 292 else 293 wake_cntrl0 = "∅"; 294 seq_printf(s, "S0i3 �� %s| ", wake_cntrl0); 295 296 if (pin_reg & BIT(WAKE_CNTRL_OFF_S3)) 297 wake_cntrl1 = "+"; 298 else 299 wake_cntrl1 = "∅"; 300 seq_printf(s, "S3 �� %s| ", wake_cntrl1); 301 302 if (pin_reg & BIT(WAKE_CNTRL_OFF_S4)) 303 wake_cntrl2 = "+"; 304 else 305 wake_cntrl2 = "∅"; 306 seq_printf(s, "S4/S5 �� %s| ", wake_cntrl2); 307 308 if (pin_reg & BIT(PULL_UP_ENABLE_OFF)) { 309 pull_up_enable = "+"; 310 if (pin_reg & BIT(PULL_UP_SEL_OFF)) 311 pull_up_sel = "8k"; 312 else 313 pull_up_sel = "4k"; 314 } else { 315 pull_up_enable = "∅"; 316 pull_up_sel = " "; 317 } 318 seq_printf(s, "pull-↑ %s (%s)| ", 319 pull_up_enable, 320 pull_up_sel); 321 322 if (pin_reg & BIT(PULL_DOWN_ENABLE_OFF)) 323 pull_down_enable = "+"; 324 else 325 pull_down_enable = "∅"; 326 seq_printf(s, "pull-↓ %s| ", pull_down_enable); 327 328 if (pin_reg & BIT(OUTPUT_ENABLE_OFF)) { 329 pin_sts = "output"; 330 if (pin_reg & BIT(OUTPUT_VALUE_OFF)) 331 orientation = "↑"; 332 else 333 orientation = "↓"; 334 } else { 335 pin_sts = "input "; 336 if (pin_reg & BIT(PIN_STS_OFF)) 337 orientation = "↑"; 338 else 339 orientation = "↓"; 340 } 341 seq_printf(s, "%s %s| ", pin_sts, orientation); 342 343 db_cntrl = (DB_CNTRl_MASK << DB_CNTRL_OFF) & pin_reg; 344 if (db_cntrl) { 345 tmr_out_unit = pin_reg & BIT(DB_TMR_OUT_UNIT_OFF); 346 tmr_large = pin_reg & BIT(DB_TMR_LARGE_OFF); 347 time = pin_reg & DB_TMR_OUT_MASK; 348 if (tmr_large) { 349 if (tmr_out_unit) 350 unit = 62500; 351 else 352 unit = 15625; 353 } else { 354 if (tmr_out_unit) 355 unit = 244; 356 else 357 unit = 61; 358 } 359 if ((DB_TYPE_REMOVE_GLITCH << DB_CNTRL_OFF) == db_cntrl) 360 debounce_enable = "b +"; 361 else if ((DB_TYPE_PRESERVE_LOW_GLITCH << DB_CNTRL_OFF) == db_cntrl) 362 debounce_enable = "↓ +"; 363 else 364 debounce_enable = "↑ +"; 365 366 } else { 367 debounce_enable = " ∅"; 368 } 369 snprintf(debounce_value, sizeof(debounce_value), "%u", time * unit); 370 seq_printf(s, "debounce %s (⏰ %sus)| ", debounce_enable, debounce_value); 371 seq_printf(s, " 0x%x\n", pin_reg); 372 } 373 } 374 } 375 #else 376 #define amd_gpio_dbg_show NULL 377 #endif 378 379 static void amd_gpio_irq_enable(struct irq_data *d) 380 { 381 u32 pin_reg; 382 unsigned long flags; 383 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 384 struct amd_gpio *gpio_dev = gpiochip_get_data(gc); 385 386 gpiochip_enable_irq(gc, d->hwirq); 387 388 raw_spin_lock_irqsave(&gpio_dev->lock, flags); 389 pin_reg = readl(gpio_dev->base + (d->hwirq)*4); 390 pin_reg |= BIT(INTERRUPT_ENABLE_OFF); 391 pin_reg |= BIT(INTERRUPT_MASK_OFF); 392 writel(pin_reg, gpio_dev->base + (d->hwirq)*4); 393 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); 394 } 395 396 static void amd_gpio_irq_disable(struct irq_data *d) 397 { 398 u32 pin_reg; 399 unsigned long flags; 400 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 401 struct amd_gpio *gpio_dev = gpiochip_get_data(gc); 402 403 raw_spin_lock_irqsave(&gpio_dev->lock, flags); 404 pin_reg = readl(gpio_dev->base + (d->hwirq)*4); 405 pin_reg &= ~BIT(INTERRUPT_ENABLE_OFF); 406 pin_reg &= ~BIT(INTERRUPT_MASK_OFF); 407 writel(pin_reg, gpio_dev->base + (d->hwirq)*4); 408 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); 409 410 gpiochip_disable_irq(gc, d->hwirq); 411 } 412 413 static void amd_gpio_irq_mask(struct irq_data *d) 414 { 415 u32 pin_reg; 416 unsigned long flags; 417 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 418 struct amd_gpio *gpio_dev = gpiochip_get_data(gc); 419 420 raw_spin_lock_irqsave(&gpio_dev->lock, flags); 421 pin_reg = readl(gpio_dev->base + (d->hwirq)*4); 422 pin_reg &= ~BIT(INTERRUPT_MASK_OFF); 423 writel(pin_reg, gpio_dev->base + (d->hwirq)*4); 424 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); 425 } 426 427 static void amd_gpio_irq_unmask(struct irq_data *d) 428 { 429 u32 pin_reg; 430 unsigned long flags; 431 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 432 struct amd_gpio *gpio_dev = gpiochip_get_data(gc); 433 434 raw_spin_lock_irqsave(&gpio_dev->lock, flags); 435 pin_reg = readl(gpio_dev->base + (d->hwirq)*4); 436 pin_reg |= BIT(INTERRUPT_MASK_OFF); 437 writel(pin_reg, gpio_dev->base + (d->hwirq)*4); 438 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); 439 } 440 441 static int amd_gpio_irq_set_wake(struct irq_data *d, unsigned int on) 442 { 443 u32 pin_reg; 444 unsigned long flags; 445 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 446 struct amd_gpio *gpio_dev = gpiochip_get_data(gc); 447 u32 wake_mask = BIT(WAKE_CNTRL_OFF_S0I3) | BIT(WAKE_CNTRL_OFF_S3); 448 int err; 449 450 raw_spin_lock_irqsave(&gpio_dev->lock, flags); 451 pin_reg = readl(gpio_dev->base + (d->hwirq)*4); 452 453 if (on) 454 pin_reg |= wake_mask; 455 else 456 pin_reg &= ~wake_mask; 457 458 writel(pin_reg, gpio_dev->base + (d->hwirq)*4); 459 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); 460 461 if (on) 462 err = enable_irq_wake(gpio_dev->irq); 463 else 464 err = disable_irq_wake(gpio_dev->irq); 465 466 if (err) 467 dev_err(&gpio_dev->pdev->dev, "failed to %s wake-up interrupt\n", 468 on ? "enable" : "disable"); 469 470 return 0; 471 } 472 473 static void amd_gpio_irq_eoi(struct irq_data *d) 474 { 475 u32 reg; 476 unsigned long flags; 477 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 478 struct amd_gpio *gpio_dev = gpiochip_get_data(gc); 479 480 raw_spin_lock_irqsave(&gpio_dev->lock, flags); 481 reg = readl(gpio_dev->base + WAKE_INT_MASTER_REG); 482 reg |= EOI_MASK; 483 writel(reg, gpio_dev->base + WAKE_INT_MASTER_REG); 484 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); 485 } 486 487 static int amd_gpio_irq_set_type(struct irq_data *d, unsigned int type) 488 { 489 int ret = 0; 490 u32 pin_reg, pin_reg_irq_en, mask; 491 unsigned long flags; 492 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 493 struct amd_gpio *gpio_dev = gpiochip_get_data(gc); 494 495 raw_spin_lock_irqsave(&gpio_dev->lock, flags); 496 pin_reg = readl(gpio_dev->base + (d->hwirq)*4); 497 498 switch (type & IRQ_TYPE_SENSE_MASK) { 499 case IRQ_TYPE_EDGE_RISING: 500 pin_reg &= ~BIT(LEVEL_TRIG_OFF); 501 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF); 502 pin_reg |= ACTIVE_HIGH << ACTIVE_LEVEL_OFF; 503 irq_set_handler_locked(d, handle_edge_irq); 504 break; 505 506 case IRQ_TYPE_EDGE_FALLING: 507 pin_reg &= ~BIT(LEVEL_TRIG_OFF); 508 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF); 509 pin_reg |= ACTIVE_LOW << ACTIVE_LEVEL_OFF; 510 irq_set_handler_locked(d, handle_edge_irq); 511 break; 512 513 case IRQ_TYPE_EDGE_BOTH: 514 pin_reg &= ~BIT(LEVEL_TRIG_OFF); 515 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF); 516 pin_reg |= BOTH_EADGE << ACTIVE_LEVEL_OFF; 517 irq_set_handler_locked(d, handle_edge_irq); 518 break; 519 520 case IRQ_TYPE_LEVEL_HIGH: 521 pin_reg |= LEVEL_TRIGGER << LEVEL_TRIG_OFF; 522 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF); 523 pin_reg |= ACTIVE_HIGH << ACTIVE_LEVEL_OFF; 524 irq_set_handler_locked(d, handle_level_irq); 525 break; 526 527 case IRQ_TYPE_LEVEL_LOW: 528 pin_reg |= LEVEL_TRIGGER << LEVEL_TRIG_OFF; 529 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF); 530 pin_reg |= ACTIVE_LOW << ACTIVE_LEVEL_OFF; 531 irq_set_handler_locked(d, handle_level_irq); 532 break; 533 534 case IRQ_TYPE_NONE: 535 break; 536 537 default: 538 dev_err(&gpio_dev->pdev->dev, "Invalid type value\n"); 539 ret = -EINVAL; 540 } 541 542 pin_reg |= CLR_INTR_STAT << INTERRUPT_STS_OFF; 543 /* 544 * If WAKE_INT_MASTER_REG.MaskStsEn is set, a software write to the 545 * debounce registers of any GPIO will block wake/interrupt status 546 * generation for *all* GPIOs for a length of time that depends on 547 * WAKE_INT_MASTER_REG.MaskStsLength[11:0]. During this period the 548 * INTERRUPT_ENABLE bit will read as 0. 549 * 550 * We temporarily enable irq for the GPIO whose configuration is 551 * changing, and then wait for it to read back as 1 to know when 552 * debounce has settled and then disable the irq again. 553 * We do this polling with the spinlock held to ensure other GPIO 554 * access routines do not read an incorrect value for the irq enable 555 * bit of other GPIOs. We keep the GPIO masked while polling to avoid 556 * spurious irqs, and disable the irq again after polling. 557 */ 558 mask = BIT(INTERRUPT_ENABLE_OFF); 559 pin_reg_irq_en = pin_reg; 560 pin_reg_irq_en |= mask; 561 pin_reg_irq_en &= ~BIT(INTERRUPT_MASK_OFF); 562 writel(pin_reg_irq_en, gpio_dev->base + (d->hwirq)*4); 563 while ((readl(gpio_dev->base + (d->hwirq)*4) & mask) != mask) 564 continue; 565 writel(pin_reg, gpio_dev->base + (d->hwirq)*4); 566 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); 567 568 return ret; 569 } 570 571 static void amd_irq_ack(struct irq_data *d) 572 { 573 /* 574 * based on HW design,there is no need to ack HW 575 * before handle current irq. But this routine is 576 * necessary for handle_edge_irq 577 */ 578 } 579 580 static const struct irq_chip amd_gpio_irqchip = { 581 .name = "amd_gpio", 582 .irq_ack = amd_irq_ack, 583 .irq_enable = amd_gpio_irq_enable, 584 .irq_disable = amd_gpio_irq_disable, 585 .irq_mask = amd_gpio_irq_mask, 586 .irq_unmask = amd_gpio_irq_unmask, 587 .irq_set_wake = amd_gpio_irq_set_wake, 588 .irq_eoi = amd_gpio_irq_eoi, 589 .irq_set_type = amd_gpio_irq_set_type, 590 /* 591 * We need to set IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND so that a wake event 592 * also generates an IRQ. We need the IRQ so the irq_handler can clear 593 * the wake event. Otherwise the wake event will never clear and 594 * prevent the system from suspending. 595 */ 596 .flags = IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND | IRQCHIP_IMMUTABLE, 597 GPIOCHIP_IRQ_RESOURCE_HELPERS, 598 }; 599 600 #define PIN_IRQ_PENDING (BIT(INTERRUPT_STS_OFF) | BIT(WAKE_STS_OFF)) 601 602 static bool do_amd_gpio_irq_handler(int irq, void *dev_id) 603 { 604 struct amd_gpio *gpio_dev = dev_id; 605 struct gpio_chip *gc = &gpio_dev->gc; 606 unsigned int i, irqnr; 607 unsigned long flags; 608 u32 __iomem *regs; 609 bool ret = false; 610 u32 regval; 611 u64 status, mask; 612 613 /* Read the wake status */ 614 raw_spin_lock_irqsave(&gpio_dev->lock, flags); 615 status = readl(gpio_dev->base + WAKE_INT_STATUS_REG1); 616 status <<= 32; 617 status |= readl(gpio_dev->base + WAKE_INT_STATUS_REG0); 618 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); 619 620 /* Bit 0-45 contain the relevant status bits */ 621 status &= (1ULL << 46) - 1; 622 regs = gpio_dev->base; 623 for (mask = 1, irqnr = 0; status; mask <<= 1, regs += 4, irqnr += 4) { 624 if (!(status & mask)) 625 continue; 626 status &= ~mask; 627 628 /* Each status bit covers four pins */ 629 for (i = 0; i < 4; i++) { 630 regval = readl(regs + i); 631 /* caused wake on resume context for shared IRQ */ 632 if (irq < 0 && (regval & BIT(WAKE_STS_OFF))) { 633 dev_dbg(&gpio_dev->pdev->dev, 634 "Waking due to GPIO %d: 0x%x", 635 irqnr + i, regval); 636 return true; 637 } 638 639 if (!(regval & PIN_IRQ_PENDING) || 640 !(regval & BIT(INTERRUPT_MASK_OFF))) 641 continue; 642 generic_handle_domain_irq(gc->irq.domain, irqnr + i); 643 644 /* Clear interrupt. 645 * We must read the pin register again, in case the 646 * value was changed while executing 647 * generic_handle_domain_irq() above. 648 * If we didn't find a mapping for the interrupt, 649 * disable it in order to avoid a system hang caused 650 * by an interrupt storm. 651 */ 652 raw_spin_lock_irqsave(&gpio_dev->lock, flags); 653 regval = readl(regs + i); 654 if (irq == 0) { 655 regval &= ~BIT(INTERRUPT_ENABLE_OFF); 656 dev_dbg(&gpio_dev->pdev->dev, 657 "Disabling spurious GPIO IRQ %d\n", 658 irqnr + i); 659 } 660 writel(regval, regs + i); 661 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); 662 ret = true; 663 } 664 } 665 /* did not cause wake on resume context for shared IRQ */ 666 if (irq < 0) 667 return false; 668 669 /* Signal EOI to the GPIO unit */ 670 raw_spin_lock_irqsave(&gpio_dev->lock, flags); 671 regval = readl(gpio_dev->base + WAKE_INT_MASTER_REG); 672 regval |= EOI_MASK; 673 writel(regval, gpio_dev->base + WAKE_INT_MASTER_REG); 674 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); 675 676 return ret; 677 } 678 679 static irqreturn_t amd_gpio_irq_handler(int irq, void *dev_id) 680 { 681 return IRQ_RETVAL(do_amd_gpio_irq_handler(irq, dev_id)); 682 } 683 684 static bool __maybe_unused amd_gpio_check_wake(void *dev_id) 685 { 686 return do_amd_gpio_irq_handler(-1, dev_id); 687 } 688 689 static int amd_get_groups_count(struct pinctrl_dev *pctldev) 690 { 691 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev); 692 693 return gpio_dev->ngroups; 694 } 695 696 static const char *amd_get_group_name(struct pinctrl_dev *pctldev, 697 unsigned group) 698 { 699 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev); 700 701 return gpio_dev->groups[group].name; 702 } 703 704 static int amd_get_group_pins(struct pinctrl_dev *pctldev, 705 unsigned group, 706 const unsigned **pins, 707 unsigned *num_pins) 708 { 709 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev); 710 711 *pins = gpio_dev->groups[group].pins; 712 *num_pins = gpio_dev->groups[group].npins; 713 return 0; 714 } 715 716 static const struct pinctrl_ops amd_pinctrl_ops = { 717 .get_groups_count = amd_get_groups_count, 718 .get_group_name = amd_get_group_name, 719 .get_group_pins = amd_get_group_pins, 720 #ifdef CONFIG_OF 721 .dt_node_to_map = pinconf_generic_dt_node_to_map_group, 722 .dt_free_map = pinctrl_utils_free_map, 723 #endif 724 }; 725 726 static int amd_pinconf_get(struct pinctrl_dev *pctldev, 727 unsigned int pin, 728 unsigned long *config) 729 { 730 u32 pin_reg; 731 unsigned arg; 732 unsigned long flags; 733 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev); 734 enum pin_config_param param = pinconf_to_config_param(*config); 735 736 raw_spin_lock_irqsave(&gpio_dev->lock, flags); 737 pin_reg = readl(gpio_dev->base + pin*4); 738 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); 739 switch (param) { 740 case PIN_CONFIG_INPUT_DEBOUNCE: 741 arg = pin_reg & DB_TMR_OUT_MASK; 742 break; 743 744 case PIN_CONFIG_BIAS_PULL_DOWN: 745 arg = (pin_reg >> PULL_DOWN_ENABLE_OFF) & BIT(0); 746 break; 747 748 case PIN_CONFIG_BIAS_PULL_UP: 749 arg = (pin_reg >> PULL_UP_SEL_OFF) & (BIT(0) | BIT(1)); 750 break; 751 752 case PIN_CONFIG_DRIVE_STRENGTH: 753 arg = (pin_reg >> DRV_STRENGTH_SEL_OFF) & DRV_STRENGTH_SEL_MASK; 754 break; 755 756 default: 757 dev_err(&gpio_dev->pdev->dev, "Invalid config param %04x\n", 758 param); 759 return -ENOTSUPP; 760 } 761 762 *config = pinconf_to_config_packed(param, arg); 763 764 return 0; 765 } 766 767 static int amd_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin, 768 unsigned long *configs, unsigned num_configs) 769 { 770 int i; 771 u32 arg; 772 int ret = 0; 773 u32 pin_reg; 774 unsigned long flags; 775 enum pin_config_param param; 776 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev); 777 778 raw_spin_lock_irqsave(&gpio_dev->lock, flags); 779 for (i = 0; i < num_configs; i++) { 780 param = pinconf_to_config_param(configs[i]); 781 arg = pinconf_to_config_argument(configs[i]); 782 pin_reg = readl(gpio_dev->base + pin*4); 783 784 switch (param) { 785 case PIN_CONFIG_INPUT_DEBOUNCE: 786 pin_reg &= ~DB_TMR_OUT_MASK; 787 pin_reg |= arg & DB_TMR_OUT_MASK; 788 break; 789 790 case PIN_CONFIG_BIAS_PULL_DOWN: 791 pin_reg &= ~BIT(PULL_DOWN_ENABLE_OFF); 792 pin_reg |= (arg & BIT(0)) << PULL_DOWN_ENABLE_OFF; 793 break; 794 795 case PIN_CONFIG_BIAS_PULL_UP: 796 pin_reg &= ~BIT(PULL_UP_SEL_OFF); 797 pin_reg |= (arg & BIT(0)) << PULL_UP_SEL_OFF; 798 pin_reg &= ~BIT(PULL_UP_ENABLE_OFF); 799 pin_reg |= ((arg>>1) & BIT(0)) << PULL_UP_ENABLE_OFF; 800 break; 801 802 case PIN_CONFIG_DRIVE_STRENGTH: 803 pin_reg &= ~(DRV_STRENGTH_SEL_MASK 804 << DRV_STRENGTH_SEL_OFF); 805 pin_reg |= (arg & DRV_STRENGTH_SEL_MASK) 806 << DRV_STRENGTH_SEL_OFF; 807 break; 808 809 default: 810 dev_err(&gpio_dev->pdev->dev, 811 "Invalid config param %04x\n", param); 812 ret = -ENOTSUPP; 813 } 814 815 writel(pin_reg, gpio_dev->base + pin*4); 816 } 817 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); 818 819 return ret; 820 } 821 822 static int amd_pinconf_group_get(struct pinctrl_dev *pctldev, 823 unsigned int group, 824 unsigned long *config) 825 { 826 const unsigned *pins; 827 unsigned npins; 828 int ret; 829 830 ret = amd_get_group_pins(pctldev, group, &pins, &npins); 831 if (ret) 832 return ret; 833 834 if (amd_pinconf_get(pctldev, pins[0], config)) 835 return -ENOTSUPP; 836 837 return 0; 838 } 839 840 static int amd_pinconf_group_set(struct pinctrl_dev *pctldev, 841 unsigned group, unsigned long *configs, 842 unsigned num_configs) 843 { 844 const unsigned *pins; 845 unsigned npins; 846 int i, ret; 847 848 ret = amd_get_group_pins(pctldev, group, &pins, &npins); 849 if (ret) 850 return ret; 851 for (i = 0; i < npins; i++) { 852 if (amd_pinconf_set(pctldev, pins[i], configs, num_configs)) 853 return -ENOTSUPP; 854 } 855 return 0; 856 } 857 858 static 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 }; 864 865 static 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(INTERRUPT_MASK_OFF) | BIT(INTERRUPT_ENABLE_OFF) | 874 BIT(WAKE_CNTRL_OFF_S4); 875 876 for (i = 0; i < desc->npins; i++) { 877 int pin = desc->pins[i].number; 878 const struct pin_desc *pd = pin_desc_get(gpio_dev->pctrl, pin); 879 880 if (!pd) 881 continue; 882 883 raw_spin_lock_irqsave(&gpio_dev->lock, flags); 884 885 pin_reg = readl(gpio_dev->base + i * 4); 886 pin_reg &= ~mask; 887 writel(pin_reg, gpio_dev->base + i * 4); 888 889 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); 890 } 891 } 892 893 #ifdef CONFIG_PM_SLEEP 894 static bool amd_gpio_should_save(struct amd_gpio *gpio_dev, unsigned int pin) 895 { 896 const struct pin_desc *pd = pin_desc_get(gpio_dev->pctrl, pin); 897 898 if (!pd) 899 return false; 900 901 /* 902 * Only restore the pin if it is actually in use by the kernel (or 903 * by userspace). 904 */ 905 if (pd->mux_owner || pd->gpio_owner || 906 gpiochip_line_is_irq(&gpio_dev->gc, pin)) 907 return true; 908 909 return false; 910 } 911 912 static int amd_gpio_suspend(struct device *dev) 913 { 914 struct amd_gpio *gpio_dev = dev_get_drvdata(dev); 915 struct pinctrl_desc *desc = gpio_dev->pctrl->desc; 916 unsigned long flags; 917 int i; 918 919 for (i = 0; i < desc->npins; i++) { 920 int pin = desc->pins[i].number; 921 922 if (!amd_gpio_should_save(gpio_dev, pin)) 923 continue; 924 925 raw_spin_lock_irqsave(&gpio_dev->lock, flags); 926 gpio_dev->saved_regs[i] = readl(gpio_dev->base + pin * 4) & ~PIN_IRQ_PENDING; 927 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); 928 } 929 930 return 0; 931 } 932 933 static int amd_gpio_resume(struct device *dev) 934 { 935 struct amd_gpio *gpio_dev = dev_get_drvdata(dev); 936 struct pinctrl_desc *desc = gpio_dev->pctrl->desc; 937 unsigned long flags; 938 int i; 939 940 for (i = 0; i < desc->npins; i++) { 941 int pin = desc->pins[i].number; 942 943 if (!amd_gpio_should_save(gpio_dev, pin)) 944 continue; 945 946 raw_spin_lock_irqsave(&gpio_dev->lock, flags); 947 gpio_dev->saved_regs[i] |= readl(gpio_dev->base + pin * 4) & PIN_IRQ_PENDING; 948 writel(gpio_dev->saved_regs[i], gpio_dev->base + pin * 4); 949 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags); 950 } 951 952 return 0; 953 } 954 955 static const struct dev_pm_ops amd_gpio_pm_ops = { 956 SET_LATE_SYSTEM_SLEEP_PM_OPS(amd_gpio_suspend, 957 amd_gpio_resume) 958 }; 959 #endif 960 961 static int amd_get_functions_count(struct pinctrl_dev *pctldev) 962 { 963 return ARRAY_SIZE(pmx_functions); 964 } 965 966 static const char *amd_get_fname(struct pinctrl_dev *pctrldev, unsigned int selector) 967 { 968 return pmx_functions[selector].name; 969 } 970 971 static int amd_get_groups(struct pinctrl_dev *pctrldev, unsigned int selector, 972 const char * const **groups, 973 unsigned int * const num_groups) 974 { 975 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctrldev); 976 977 if (!gpio_dev->iomux_base) { 978 dev_err(&gpio_dev->pdev->dev, "iomux function %d group not supported\n", selector); 979 return -EINVAL; 980 } 981 982 *groups = pmx_functions[selector].groups; 983 *num_groups = pmx_functions[selector].ngroups; 984 return 0; 985 } 986 987 static int amd_set_mux(struct pinctrl_dev *pctrldev, unsigned int function, unsigned int group) 988 { 989 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctrldev); 990 struct device *dev = &gpio_dev->pdev->dev; 991 struct pin_desc *pd; 992 int ind, index; 993 994 if (!gpio_dev->iomux_base) 995 return -EINVAL; 996 997 for (index = 0; index < NSELECTS; index++) { 998 if (strcmp(gpio_dev->groups[group].name, pmx_functions[function].groups[index])) 999 continue; 1000 1001 if (readb(gpio_dev->iomux_base + pmx_functions[function].index) == 1002 FUNCTION_INVALID) { 1003 dev_err(dev, "IOMUX_GPIO 0x%x not present or supported\n", 1004 pmx_functions[function].index); 1005 return -EINVAL; 1006 } 1007 1008 writeb(index, gpio_dev->iomux_base + pmx_functions[function].index); 1009 1010 if (index != (readb(gpio_dev->iomux_base + pmx_functions[function].index) & 1011 FUNCTION_MASK)) { 1012 dev_err(dev, "IOMUX_GPIO 0x%x not present or supported\n", 1013 pmx_functions[function].index); 1014 return -EINVAL; 1015 } 1016 1017 for (ind = 0; ind < gpio_dev->groups[group].npins; ind++) { 1018 if (strncmp(gpio_dev->groups[group].name, "IMX_F", strlen("IMX_F"))) 1019 continue; 1020 1021 pd = pin_desc_get(gpio_dev->pctrl, gpio_dev->groups[group].pins[ind]); 1022 pd->mux_owner = gpio_dev->groups[group].name; 1023 } 1024 break; 1025 } 1026 1027 return 0; 1028 } 1029 1030 static const struct pinmux_ops amd_pmxops = { 1031 .get_functions_count = amd_get_functions_count, 1032 .get_function_name = amd_get_fname, 1033 .get_function_groups = amd_get_groups, 1034 .set_mux = amd_set_mux, 1035 }; 1036 1037 static struct pinctrl_desc amd_pinctrl_desc = { 1038 .pins = kerncz_pins, 1039 .npins = ARRAY_SIZE(kerncz_pins), 1040 .pctlops = &amd_pinctrl_ops, 1041 .pmxops = &amd_pmxops, 1042 .confops = &amd_pinconf_ops, 1043 .owner = THIS_MODULE, 1044 }; 1045 1046 static void amd_get_iomux_res(struct amd_gpio *gpio_dev) 1047 { 1048 struct pinctrl_desc *desc = &amd_pinctrl_desc; 1049 struct device *dev = &gpio_dev->pdev->dev; 1050 int index; 1051 1052 index = device_property_match_string(dev, "pinctrl-resource-names", "iomux"); 1053 if (index < 0) { 1054 dev_warn(dev, "failed to get iomux index\n"); 1055 goto out_no_pinmux; 1056 } 1057 1058 gpio_dev->iomux_base = devm_platform_ioremap_resource(gpio_dev->pdev, index); 1059 if (IS_ERR(gpio_dev->iomux_base)) { 1060 dev_warn(dev, "Failed to get iomux %d io resource\n", index); 1061 goto out_no_pinmux; 1062 } 1063 1064 return; 1065 1066 out_no_pinmux: 1067 desc->pmxops = NULL; 1068 } 1069 1070 static int amd_gpio_probe(struct platform_device *pdev) 1071 { 1072 int ret = 0; 1073 struct resource *res; 1074 struct amd_gpio *gpio_dev; 1075 struct gpio_irq_chip *girq; 1076 1077 gpio_dev = devm_kzalloc(&pdev->dev, 1078 sizeof(struct amd_gpio), GFP_KERNEL); 1079 if (!gpio_dev) 1080 return -ENOMEM; 1081 1082 raw_spin_lock_init(&gpio_dev->lock); 1083 1084 gpio_dev->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res); 1085 if (IS_ERR(gpio_dev->base)) { 1086 dev_err(&pdev->dev, "Failed to get gpio io resource.\n"); 1087 return PTR_ERR(gpio_dev->base); 1088 } 1089 1090 gpio_dev->irq = platform_get_irq(pdev, 0); 1091 if (gpio_dev->irq < 0) 1092 return gpio_dev->irq; 1093 1094 #ifdef CONFIG_PM_SLEEP 1095 gpio_dev->saved_regs = devm_kcalloc(&pdev->dev, amd_pinctrl_desc.npins, 1096 sizeof(*gpio_dev->saved_regs), 1097 GFP_KERNEL); 1098 if (!gpio_dev->saved_regs) 1099 return -ENOMEM; 1100 #endif 1101 1102 gpio_dev->pdev = pdev; 1103 gpio_dev->gc.get_direction = amd_gpio_get_direction; 1104 gpio_dev->gc.direction_input = amd_gpio_direction_input; 1105 gpio_dev->gc.direction_output = amd_gpio_direction_output; 1106 gpio_dev->gc.get = amd_gpio_get_value; 1107 gpio_dev->gc.set = amd_gpio_set_value; 1108 gpio_dev->gc.set_config = amd_gpio_set_config; 1109 gpio_dev->gc.dbg_show = amd_gpio_dbg_show; 1110 1111 gpio_dev->gc.base = -1; 1112 gpio_dev->gc.label = pdev->name; 1113 gpio_dev->gc.owner = THIS_MODULE; 1114 gpio_dev->gc.parent = &pdev->dev; 1115 gpio_dev->gc.ngpio = resource_size(res) / 4; 1116 1117 gpio_dev->hwbank_num = gpio_dev->gc.ngpio / 64; 1118 gpio_dev->groups = kerncz_groups; 1119 gpio_dev->ngroups = ARRAY_SIZE(kerncz_groups); 1120 1121 amd_pinctrl_desc.name = dev_name(&pdev->dev); 1122 amd_get_iomux_res(gpio_dev); 1123 gpio_dev->pctrl = devm_pinctrl_register(&pdev->dev, &amd_pinctrl_desc, 1124 gpio_dev); 1125 if (IS_ERR(gpio_dev->pctrl)) { 1126 dev_err(&pdev->dev, "Couldn't register pinctrl driver\n"); 1127 return PTR_ERR(gpio_dev->pctrl); 1128 } 1129 1130 /* Disable and mask interrupts */ 1131 amd_gpio_irq_init(gpio_dev); 1132 1133 girq = &gpio_dev->gc.irq; 1134 gpio_irq_chip_set_chip(girq, &amd_gpio_irqchip); 1135 /* This will let us handle the parent IRQ in the driver */ 1136 girq->parent_handler = NULL; 1137 girq->num_parents = 0; 1138 girq->parents = NULL; 1139 girq->default_type = IRQ_TYPE_NONE; 1140 girq->handler = handle_simple_irq; 1141 1142 ret = gpiochip_add_data(&gpio_dev->gc, gpio_dev); 1143 if (ret) 1144 return ret; 1145 1146 ret = gpiochip_add_pin_range(&gpio_dev->gc, dev_name(&pdev->dev), 1147 0, 0, gpio_dev->gc.ngpio); 1148 if (ret) { 1149 dev_err(&pdev->dev, "Failed to add pin range\n"); 1150 goto out2; 1151 } 1152 1153 ret = devm_request_irq(&pdev->dev, gpio_dev->irq, amd_gpio_irq_handler, 1154 IRQF_SHARED, KBUILD_MODNAME, gpio_dev); 1155 if (ret) 1156 goto out2; 1157 1158 platform_set_drvdata(pdev, gpio_dev); 1159 acpi_register_wakeup_handler(gpio_dev->irq, amd_gpio_check_wake, gpio_dev); 1160 1161 dev_dbg(&pdev->dev, "amd gpio driver loaded\n"); 1162 return ret; 1163 1164 out2: 1165 gpiochip_remove(&gpio_dev->gc); 1166 1167 return ret; 1168 } 1169 1170 static int amd_gpio_remove(struct platform_device *pdev) 1171 { 1172 struct amd_gpio *gpio_dev; 1173 1174 gpio_dev = platform_get_drvdata(pdev); 1175 1176 gpiochip_remove(&gpio_dev->gc); 1177 acpi_unregister_wakeup_handler(amd_gpio_check_wake, gpio_dev); 1178 1179 return 0; 1180 } 1181 1182 #ifdef CONFIG_ACPI 1183 static const struct acpi_device_id amd_gpio_acpi_match[] = { 1184 { "AMD0030", 0 }, 1185 { "AMDI0030", 0}, 1186 { "AMDI0031", 0}, 1187 { }, 1188 }; 1189 MODULE_DEVICE_TABLE(acpi, amd_gpio_acpi_match); 1190 #endif 1191 1192 static struct platform_driver amd_gpio_driver = { 1193 .driver = { 1194 .name = "amd_gpio", 1195 .acpi_match_table = ACPI_PTR(amd_gpio_acpi_match), 1196 #ifdef CONFIG_PM_SLEEP 1197 .pm = &amd_gpio_pm_ops, 1198 #endif 1199 }, 1200 .probe = amd_gpio_probe, 1201 .remove = amd_gpio_remove, 1202 }; 1203 1204 module_platform_driver(amd_gpio_driver); 1205 1206 MODULE_LICENSE("GPL v2"); 1207 MODULE_AUTHOR("Ken Xue <Ken.Xue@amd.com>, Jeff Wu <Jeff.Wu@amd.com>"); 1208 MODULE_DESCRIPTION("AMD GPIO pinctrl driver"); 1209