1 /* 2 * GPIO driver for AMD 3 * 4 * Copyright (c) 2014,2015 AMD Corporation. 5 * Authors: Ken Xue <Ken.Xue@amd.com> 6 * Wu, Jeff <Jeff.Wu@amd.com> 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms and conditions of the GNU General Public License, 10 * version 2, as published by the Free Software Foundation. 11 */ 12 13 #include <linux/err.h> 14 #include <linux/bug.h> 15 #include <linux/kernel.h> 16 #include <linux/module.h> 17 #include <linux/spinlock.h> 18 #include <linux/compiler.h> 19 #include <linux/types.h> 20 #include <linux/errno.h> 21 #include <linux/log2.h> 22 #include <linux/io.h> 23 #include <linux/gpio.h> 24 #include <linux/slab.h> 25 #include <linux/platform_device.h> 26 #include <linux/mutex.h> 27 #include <linux/acpi.h> 28 #include <linux/seq_file.h> 29 #include <linux/interrupt.h> 30 #include <linux/list.h> 31 #include <linux/bitops.h> 32 #include <linux/pinctrl/pinconf.h> 33 #include <linux/pinctrl/pinconf-generic.h> 34 35 #include "pinctrl-utils.h" 36 #include "pinctrl-amd.h" 37 38 static int amd_gpio_direction_input(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 spin_lock_irqsave(&gpio_dev->lock, flags); 45 pin_reg = readl(gpio_dev->base + offset * 4); 46 pin_reg &= ~BIT(OUTPUT_ENABLE_OFF); 47 writel(pin_reg, gpio_dev->base + offset * 4); 48 spin_unlock_irqrestore(&gpio_dev->lock, flags); 49 50 return 0; 51 } 52 53 static int amd_gpio_direction_output(struct gpio_chip *gc, unsigned offset, 54 int value) 55 { 56 u32 pin_reg; 57 unsigned long flags; 58 struct amd_gpio *gpio_dev = gpiochip_get_data(gc); 59 60 spin_lock_irqsave(&gpio_dev->lock, flags); 61 pin_reg = readl(gpio_dev->base + offset * 4); 62 pin_reg |= BIT(OUTPUT_ENABLE_OFF); 63 if (value) 64 pin_reg |= BIT(OUTPUT_VALUE_OFF); 65 else 66 pin_reg &= ~BIT(OUTPUT_VALUE_OFF); 67 writel(pin_reg, gpio_dev->base + offset * 4); 68 spin_unlock_irqrestore(&gpio_dev->lock, flags); 69 70 return 0; 71 } 72 73 static int amd_gpio_get_value(struct gpio_chip *gc, unsigned offset) 74 { 75 u32 pin_reg; 76 unsigned long flags; 77 struct amd_gpio *gpio_dev = gpiochip_get_data(gc); 78 79 spin_lock_irqsave(&gpio_dev->lock, flags); 80 pin_reg = readl(gpio_dev->base + offset * 4); 81 spin_unlock_irqrestore(&gpio_dev->lock, flags); 82 83 return !!(pin_reg & BIT(PIN_STS_OFF)); 84 } 85 86 static void amd_gpio_set_value(struct gpio_chip *gc, unsigned offset, int value) 87 { 88 u32 pin_reg; 89 unsigned long flags; 90 struct amd_gpio *gpio_dev = gpiochip_get_data(gc); 91 92 spin_lock_irqsave(&gpio_dev->lock, flags); 93 pin_reg = readl(gpio_dev->base + offset * 4); 94 if (value) 95 pin_reg |= BIT(OUTPUT_VALUE_OFF); 96 else 97 pin_reg &= ~BIT(OUTPUT_VALUE_OFF); 98 writel(pin_reg, gpio_dev->base + offset * 4); 99 spin_unlock_irqrestore(&gpio_dev->lock, flags); 100 } 101 102 static int amd_gpio_set_debounce(struct gpio_chip *gc, unsigned offset, 103 unsigned debounce) 104 { 105 u32 time; 106 u32 pin_reg; 107 int ret = 0; 108 unsigned long flags; 109 struct amd_gpio *gpio_dev = gpiochip_get_data(gc); 110 111 spin_lock_irqsave(&gpio_dev->lock, flags); 112 pin_reg = readl(gpio_dev->base + offset * 4); 113 114 if (debounce) { 115 pin_reg |= DB_TYPE_REMOVE_GLITCH << DB_CNTRL_OFF; 116 pin_reg &= ~DB_TMR_OUT_MASK; 117 /* 118 Debounce Debounce Timer Max 119 TmrLarge TmrOutUnit Unit Debounce 120 Time 121 0 0 61 usec (2 RtcClk) 976 usec 122 0 1 244 usec (8 RtcClk) 3.9 msec 123 1 0 15.6 msec (512 RtcClk) 250 msec 124 1 1 62.5 msec (2048 RtcClk) 1 sec 125 */ 126 127 if (debounce < 61) { 128 pin_reg |= 1; 129 pin_reg &= ~BIT(DB_TMR_OUT_UNIT_OFF); 130 pin_reg &= ~BIT(DB_TMR_LARGE_OFF); 131 } else if (debounce < 976) { 132 time = debounce / 61; 133 pin_reg |= time & DB_TMR_OUT_MASK; 134 pin_reg &= ~BIT(DB_TMR_OUT_UNIT_OFF); 135 pin_reg &= ~BIT(DB_TMR_LARGE_OFF); 136 } else if (debounce < 3900) { 137 time = debounce / 244; 138 pin_reg |= time & DB_TMR_OUT_MASK; 139 pin_reg |= BIT(DB_TMR_OUT_UNIT_OFF); 140 pin_reg &= ~BIT(DB_TMR_LARGE_OFF); 141 } else if (debounce < 250000) { 142 time = debounce / 15600; 143 pin_reg |= time & DB_TMR_OUT_MASK; 144 pin_reg &= ~BIT(DB_TMR_OUT_UNIT_OFF); 145 pin_reg |= BIT(DB_TMR_LARGE_OFF); 146 } else if (debounce < 1000000) { 147 time = debounce / 62500; 148 pin_reg |= time & DB_TMR_OUT_MASK; 149 pin_reg |= BIT(DB_TMR_OUT_UNIT_OFF); 150 pin_reg |= BIT(DB_TMR_LARGE_OFF); 151 } else { 152 pin_reg &= ~DB_CNTRl_MASK; 153 ret = -EINVAL; 154 } 155 } else { 156 pin_reg &= ~BIT(DB_TMR_OUT_UNIT_OFF); 157 pin_reg &= ~BIT(DB_TMR_LARGE_OFF); 158 pin_reg &= ~DB_TMR_OUT_MASK; 159 pin_reg &= ~DB_CNTRl_MASK; 160 } 161 writel(pin_reg, gpio_dev->base + offset * 4); 162 spin_unlock_irqrestore(&gpio_dev->lock, flags); 163 164 return ret; 165 } 166 167 #ifdef CONFIG_DEBUG_FS 168 static void amd_gpio_dbg_show(struct seq_file *s, struct gpio_chip *gc) 169 { 170 u32 pin_reg; 171 unsigned long flags; 172 unsigned int bank, i, pin_num; 173 struct amd_gpio *gpio_dev = gpiochip_get_data(gc); 174 175 char *level_trig; 176 char *active_level; 177 char *interrupt_enable; 178 char *interrupt_mask; 179 char *wake_cntrl0; 180 char *wake_cntrl1; 181 char *wake_cntrl2; 182 char *pin_sts; 183 char *pull_up_sel; 184 char *pull_up_enable; 185 char *pull_down_enable; 186 char *output_value; 187 char *output_enable; 188 189 for (bank = 0; bank < AMD_GPIO_TOTAL_BANKS; bank++) { 190 seq_printf(s, "GPIO bank%d\t", bank); 191 192 switch (bank) { 193 case 0: 194 i = 0; 195 pin_num = AMD_GPIO_PINS_BANK0; 196 break; 197 case 1: 198 i = 64; 199 pin_num = AMD_GPIO_PINS_BANK1 + i; 200 break; 201 case 2: 202 i = 128; 203 pin_num = AMD_GPIO_PINS_BANK2 + i; 204 break; 205 } 206 207 for (; i < pin_num; i++) { 208 seq_printf(s, "pin%d\t", i); 209 spin_lock_irqsave(&gpio_dev->lock, flags); 210 pin_reg = readl(gpio_dev->base + i * 4); 211 spin_unlock_irqrestore(&gpio_dev->lock, flags); 212 213 if (pin_reg & BIT(INTERRUPT_ENABLE_OFF)) { 214 interrupt_enable = "interrupt is enabled|"; 215 216 if (!(pin_reg & BIT(ACTIVE_LEVEL_OFF)) 217 && !(pin_reg & BIT(ACTIVE_LEVEL_OFF+1))) 218 active_level = "Active low|"; 219 else if (pin_reg & BIT(ACTIVE_LEVEL_OFF) 220 && !(pin_reg & BIT(ACTIVE_LEVEL_OFF+1))) 221 active_level = "Active high|"; 222 else if (!(pin_reg & BIT(ACTIVE_LEVEL_OFF)) 223 && pin_reg & BIT(ACTIVE_LEVEL_OFF+1)) 224 active_level = "Active on both|"; 225 else 226 active_level = "Unknow Active level|"; 227 228 if (pin_reg & BIT(LEVEL_TRIG_OFF)) 229 level_trig = "Level trigger|"; 230 else 231 level_trig = "Edge trigger|"; 232 233 } else { 234 interrupt_enable = 235 "interrupt is disabled|"; 236 active_level = " "; 237 level_trig = " "; 238 } 239 240 if (pin_reg & BIT(INTERRUPT_MASK_OFF)) 241 interrupt_mask = 242 "interrupt is unmasked|"; 243 else 244 interrupt_mask = 245 "interrupt is masked|"; 246 247 if (pin_reg & BIT(WAKE_CNTRL_OFF)) 248 wake_cntrl0 = "enable wakeup in S0i3 state|"; 249 else 250 wake_cntrl0 = "disable wakeup in S0i3 state|"; 251 252 if (pin_reg & BIT(WAKE_CNTRL_OFF)) 253 wake_cntrl1 = "enable wakeup in S3 state|"; 254 else 255 wake_cntrl1 = "disable wakeup in S3 state|"; 256 257 if (pin_reg & BIT(WAKE_CNTRL_OFF)) 258 wake_cntrl2 = "enable wakeup in S4/S5 state|"; 259 else 260 wake_cntrl2 = "disable wakeup in S4/S5 state|"; 261 262 if (pin_reg & BIT(PULL_UP_ENABLE_OFF)) { 263 pull_up_enable = "pull-up is enabled|"; 264 if (pin_reg & BIT(PULL_UP_SEL_OFF)) 265 pull_up_sel = "8k pull-up|"; 266 else 267 pull_up_sel = "4k pull-up|"; 268 } else { 269 pull_up_enable = "pull-up is disabled|"; 270 pull_up_sel = " "; 271 } 272 273 if (pin_reg & BIT(PULL_DOWN_ENABLE_OFF)) 274 pull_down_enable = "pull-down is enabled|"; 275 else 276 pull_down_enable = "Pull-down is disabled|"; 277 278 if (pin_reg & BIT(OUTPUT_ENABLE_OFF)) { 279 pin_sts = " "; 280 output_enable = "output is enabled|"; 281 if (pin_reg & BIT(OUTPUT_VALUE_OFF)) 282 output_value = "output is high|"; 283 else 284 output_value = "output is low|"; 285 } else { 286 output_enable = "output is disabled|"; 287 output_value = " "; 288 289 if (pin_reg & BIT(PIN_STS_OFF)) 290 pin_sts = "input is high|"; 291 else 292 pin_sts = "input is low|"; 293 } 294 295 seq_printf(s, "%s %s %s %s %s %s\n" 296 " %s %s %s %s %s %s %s 0x%x\n", 297 level_trig, active_level, interrupt_enable, 298 interrupt_mask, wake_cntrl0, wake_cntrl1, 299 wake_cntrl2, pin_sts, pull_up_sel, 300 pull_up_enable, pull_down_enable, 301 output_value, output_enable, pin_reg); 302 } 303 } 304 } 305 #else 306 #define amd_gpio_dbg_show NULL 307 #endif 308 309 static void amd_gpio_irq_enable(struct irq_data *d) 310 { 311 u32 pin_reg; 312 unsigned long flags; 313 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 314 struct amd_gpio *gpio_dev = gpiochip_get_data(gc); 315 316 spin_lock_irqsave(&gpio_dev->lock, flags); 317 pin_reg = readl(gpio_dev->base + (d->hwirq)*4); 318 pin_reg |= BIT(INTERRUPT_ENABLE_OFF); 319 pin_reg |= BIT(INTERRUPT_MASK_OFF); 320 writel(pin_reg, gpio_dev->base + (d->hwirq)*4); 321 spin_unlock_irqrestore(&gpio_dev->lock, flags); 322 } 323 324 static void amd_gpio_irq_disable(struct irq_data *d) 325 { 326 u32 pin_reg; 327 unsigned long flags; 328 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 329 struct amd_gpio *gpio_dev = gpiochip_get_data(gc); 330 331 spin_lock_irqsave(&gpio_dev->lock, flags); 332 pin_reg = readl(gpio_dev->base + (d->hwirq)*4); 333 pin_reg &= ~BIT(INTERRUPT_ENABLE_OFF); 334 pin_reg &= ~BIT(INTERRUPT_MASK_OFF); 335 writel(pin_reg, gpio_dev->base + (d->hwirq)*4); 336 spin_unlock_irqrestore(&gpio_dev->lock, flags); 337 } 338 339 static void amd_gpio_irq_mask(struct irq_data *d) 340 { 341 u32 pin_reg; 342 unsigned long flags; 343 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 344 struct amd_gpio *gpio_dev = gpiochip_get_data(gc); 345 346 spin_lock_irqsave(&gpio_dev->lock, flags); 347 pin_reg = readl(gpio_dev->base + (d->hwirq)*4); 348 pin_reg &= ~BIT(INTERRUPT_MASK_OFF); 349 writel(pin_reg, gpio_dev->base + (d->hwirq)*4); 350 spin_unlock_irqrestore(&gpio_dev->lock, flags); 351 } 352 353 static void amd_gpio_irq_unmask(struct irq_data *d) 354 { 355 u32 pin_reg; 356 unsigned long flags; 357 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 358 struct amd_gpio *gpio_dev = gpiochip_get_data(gc); 359 360 spin_lock_irqsave(&gpio_dev->lock, flags); 361 pin_reg = readl(gpio_dev->base + (d->hwirq)*4); 362 pin_reg |= BIT(INTERRUPT_MASK_OFF); 363 writel(pin_reg, gpio_dev->base + (d->hwirq)*4); 364 spin_unlock_irqrestore(&gpio_dev->lock, flags); 365 } 366 367 static void amd_gpio_irq_eoi(struct irq_data *d) 368 { 369 u32 reg; 370 unsigned long flags; 371 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 372 struct amd_gpio *gpio_dev = gpiochip_get_data(gc); 373 374 spin_lock_irqsave(&gpio_dev->lock, flags); 375 reg = readl(gpio_dev->base + WAKE_INT_MASTER_REG); 376 reg |= EOI_MASK; 377 writel(reg, gpio_dev->base + WAKE_INT_MASTER_REG); 378 spin_unlock_irqrestore(&gpio_dev->lock, flags); 379 } 380 381 static int amd_gpio_irq_set_type(struct irq_data *d, unsigned int type) 382 { 383 int ret = 0; 384 u32 pin_reg; 385 unsigned long flags; 386 bool level_trig; 387 u32 active_level; 388 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 389 struct amd_gpio *gpio_dev = gpiochip_get_data(gc); 390 391 spin_lock_irqsave(&gpio_dev->lock, flags); 392 pin_reg = readl(gpio_dev->base + (d->hwirq)*4); 393 394 /* 395 * When level_trig is set EDGE and active_level is set HIGH in BIOS 396 * default settings, ignore incoming settings from client and use 397 * BIOS settings to configure GPIO register. 398 */ 399 level_trig = !(pin_reg & (LEVEL_TRIGGER << LEVEL_TRIG_OFF)); 400 active_level = pin_reg & (ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF); 401 402 if(level_trig && 403 ((active_level >> ACTIVE_LEVEL_OFF) == ACTIVE_HIGH)) 404 type = IRQ_TYPE_EDGE_FALLING; 405 406 switch (type & IRQ_TYPE_SENSE_MASK) { 407 case IRQ_TYPE_EDGE_RISING: 408 pin_reg &= ~BIT(LEVEL_TRIG_OFF); 409 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF); 410 pin_reg |= ACTIVE_HIGH << ACTIVE_LEVEL_OFF; 411 pin_reg |= DB_TYPE_REMOVE_GLITCH << DB_CNTRL_OFF; 412 irq_set_handler_locked(d, handle_edge_irq); 413 break; 414 415 case IRQ_TYPE_EDGE_FALLING: 416 pin_reg &= ~BIT(LEVEL_TRIG_OFF); 417 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF); 418 pin_reg |= ACTIVE_LOW << ACTIVE_LEVEL_OFF; 419 pin_reg |= DB_TYPE_REMOVE_GLITCH << DB_CNTRL_OFF; 420 irq_set_handler_locked(d, handle_edge_irq); 421 break; 422 423 case IRQ_TYPE_EDGE_BOTH: 424 pin_reg &= ~BIT(LEVEL_TRIG_OFF); 425 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF); 426 pin_reg |= BOTH_EADGE << ACTIVE_LEVEL_OFF; 427 pin_reg |= DB_TYPE_REMOVE_GLITCH << DB_CNTRL_OFF; 428 irq_set_handler_locked(d, handle_edge_irq); 429 break; 430 431 case IRQ_TYPE_LEVEL_HIGH: 432 pin_reg |= LEVEL_TRIGGER << LEVEL_TRIG_OFF; 433 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF); 434 pin_reg |= ACTIVE_HIGH << ACTIVE_LEVEL_OFF; 435 pin_reg &= ~(DB_CNTRl_MASK << DB_CNTRL_OFF); 436 pin_reg |= DB_TYPE_PRESERVE_LOW_GLITCH << DB_CNTRL_OFF; 437 irq_set_handler_locked(d, handle_level_irq); 438 break; 439 440 case IRQ_TYPE_LEVEL_LOW: 441 pin_reg |= LEVEL_TRIGGER << LEVEL_TRIG_OFF; 442 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF); 443 pin_reg |= ACTIVE_LOW << ACTIVE_LEVEL_OFF; 444 pin_reg &= ~(DB_CNTRl_MASK << DB_CNTRL_OFF); 445 pin_reg |= DB_TYPE_PRESERVE_HIGH_GLITCH << DB_CNTRL_OFF; 446 irq_set_handler_locked(d, handle_level_irq); 447 break; 448 449 case IRQ_TYPE_NONE: 450 break; 451 452 default: 453 dev_err(&gpio_dev->pdev->dev, "Invalid type value\n"); 454 ret = -EINVAL; 455 } 456 457 pin_reg |= CLR_INTR_STAT << INTERRUPT_STS_OFF; 458 writel(pin_reg, gpio_dev->base + (d->hwirq)*4); 459 spin_unlock_irqrestore(&gpio_dev->lock, flags); 460 461 return ret; 462 } 463 464 static void amd_irq_ack(struct irq_data *d) 465 { 466 /* 467 * based on HW design,there is no need to ack HW 468 * before handle current irq. But this routine is 469 * necessary for handle_edge_irq 470 */ 471 } 472 473 static struct irq_chip amd_gpio_irqchip = { 474 .name = "amd_gpio", 475 .irq_ack = amd_irq_ack, 476 .irq_enable = amd_gpio_irq_enable, 477 .irq_disable = amd_gpio_irq_disable, 478 .irq_mask = amd_gpio_irq_mask, 479 .irq_unmask = amd_gpio_irq_unmask, 480 .irq_eoi = amd_gpio_irq_eoi, 481 .irq_set_type = amd_gpio_irq_set_type, 482 }; 483 484 static void amd_gpio_irq_handler(struct irq_desc *desc) 485 { 486 u32 i; 487 u32 off; 488 u32 reg; 489 u32 pin_reg; 490 u64 reg64; 491 int handled = 0; 492 unsigned int irq; 493 unsigned long flags; 494 struct irq_chip *chip = irq_desc_get_chip(desc); 495 struct gpio_chip *gc = irq_desc_get_handler_data(desc); 496 struct amd_gpio *gpio_dev = gpiochip_get_data(gc); 497 498 chained_irq_enter(chip, desc); 499 /*enable GPIO interrupt again*/ 500 spin_lock_irqsave(&gpio_dev->lock, flags); 501 reg = readl(gpio_dev->base + WAKE_INT_STATUS_REG1); 502 reg64 = reg; 503 reg64 = reg64 << 32; 504 505 reg = readl(gpio_dev->base + WAKE_INT_STATUS_REG0); 506 reg64 |= reg; 507 spin_unlock_irqrestore(&gpio_dev->lock, flags); 508 509 /* 510 * first 46 bits indicates interrupt status. 511 * one bit represents four interrupt sources. 512 */ 513 for (off = 0; off < 46 ; off++) { 514 if (reg64 & BIT(off)) { 515 for (i = 0; i < 4; i++) { 516 pin_reg = readl(gpio_dev->base + 517 (off * 4 + i) * 4); 518 if ((pin_reg & BIT(INTERRUPT_STS_OFF)) || 519 (pin_reg & BIT(WAKE_STS_OFF))) { 520 irq = irq_find_mapping(gc->irqdomain, 521 off * 4 + i); 522 generic_handle_irq(irq); 523 writel(pin_reg, 524 gpio_dev->base 525 + (off * 4 + i) * 4); 526 handled++; 527 } 528 } 529 } 530 } 531 532 if (handled == 0) 533 handle_bad_irq(desc); 534 535 spin_lock_irqsave(&gpio_dev->lock, flags); 536 reg = readl(gpio_dev->base + WAKE_INT_MASTER_REG); 537 reg |= EOI_MASK; 538 writel(reg, gpio_dev->base + WAKE_INT_MASTER_REG); 539 spin_unlock_irqrestore(&gpio_dev->lock, flags); 540 541 chained_irq_exit(chip, desc); 542 } 543 544 static int amd_get_groups_count(struct pinctrl_dev *pctldev) 545 { 546 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev); 547 548 return gpio_dev->ngroups; 549 } 550 551 static const char *amd_get_group_name(struct pinctrl_dev *pctldev, 552 unsigned group) 553 { 554 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev); 555 556 return gpio_dev->groups[group].name; 557 } 558 559 static int amd_get_group_pins(struct pinctrl_dev *pctldev, 560 unsigned group, 561 const unsigned **pins, 562 unsigned *num_pins) 563 { 564 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev); 565 566 *pins = gpio_dev->groups[group].pins; 567 *num_pins = gpio_dev->groups[group].npins; 568 return 0; 569 } 570 571 static const struct pinctrl_ops amd_pinctrl_ops = { 572 .get_groups_count = amd_get_groups_count, 573 .get_group_name = amd_get_group_name, 574 .get_group_pins = amd_get_group_pins, 575 #ifdef CONFIG_OF 576 .dt_node_to_map = pinconf_generic_dt_node_to_map_group, 577 .dt_free_map = pinctrl_utils_free_map, 578 #endif 579 }; 580 581 static int amd_pinconf_get(struct pinctrl_dev *pctldev, 582 unsigned int pin, 583 unsigned long *config) 584 { 585 u32 pin_reg; 586 unsigned arg; 587 unsigned long flags; 588 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev); 589 enum pin_config_param param = pinconf_to_config_param(*config); 590 591 spin_lock_irqsave(&gpio_dev->lock, flags); 592 pin_reg = readl(gpio_dev->base + pin*4); 593 spin_unlock_irqrestore(&gpio_dev->lock, flags); 594 switch (param) { 595 case PIN_CONFIG_INPUT_DEBOUNCE: 596 arg = pin_reg & DB_TMR_OUT_MASK; 597 break; 598 599 case PIN_CONFIG_BIAS_PULL_DOWN: 600 arg = (pin_reg >> PULL_DOWN_ENABLE_OFF) & BIT(0); 601 break; 602 603 case PIN_CONFIG_BIAS_PULL_UP: 604 arg = (pin_reg >> PULL_UP_SEL_OFF) & (BIT(0) | BIT(1)); 605 break; 606 607 case PIN_CONFIG_DRIVE_STRENGTH: 608 arg = (pin_reg >> DRV_STRENGTH_SEL_OFF) & DRV_STRENGTH_SEL_MASK; 609 break; 610 611 default: 612 dev_err(&gpio_dev->pdev->dev, "Invalid config param %04x\n", 613 param); 614 return -ENOTSUPP; 615 } 616 617 *config = pinconf_to_config_packed(param, arg); 618 619 return 0; 620 } 621 622 static int amd_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin, 623 unsigned long *configs, unsigned num_configs) 624 { 625 int i; 626 u32 arg; 627 int ret = 0; 628 u32 pin_reg; 629 unsigned long flags; 630 enum pin_config_param param; 631 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev); 632 633 spin_lock_irqsave(&gpio_dev->lock, flags); 634 for (i = 0; i < num_configs; i++) { 635 param = pinconf_to_config_param(configs[i]); 636 arg = pinconf_to_config_argument(configs[i]); 637 pin_reg = readl(gpio_dev->base + pin*4); 638 639 switch (param) { 640 case PIN_CONFIG_INPUT_DEBOUNCE: 641 pin_reg &= ~DB_TMR_OUT_MASK; 642 pin_reg |= arg & DB_TMR_OUT_MASK; 643 break; 644 645 case PIN_CONFIG_BIAS_PULL_DOWN: 646 pin_reg &= ~BIT(PULL_DOWN_ENABLE_OFF); 647 pin_reg |= (arg & BIT(0)) << PULL_DOWN_ENABLE_OFF; 648 break; 649 650 case PIN_CONFIG_BIAS_PULL_UP: 651 pin_reg &= ~BIT(PULL_UP_SEL_OFF); 652 pin_reg |= (arg & BIT(0)) << PULL_UP_SEL_OFF; 653 pin_reg &= ~BIT(PULL_UP_ENABLE_OFF); 654 pin_reg |= ((arg>>1) & BIT(0)) << PULL_UP_ENABLE_OFF; 655 break; 656 657 case PIN_CONFIG_DRIVE_STRENGTH: 658 pin_reg &= ~(DRV_STRENGTH_SEL_MASK 659 << DRV_STRENGTH_SEL_OFF); 660 pin_reg |= (arg & DRV_STRENGTH_SEL_MASK) 661 << DRV_STRENGTH_SEL_OFF; 662 break; 663 664 default: 665 dev_err(&gpio_dev->pdev->dev, 666 "Invalid config param %04x\n", param); 667 ret = -ENOTSUPP; 668 } 669 670 writel(pin_reg, gpio_dev->base + pin*4); 671 } 672 spin_unlock_irqrestore(&gpio_dev->lock, flags); 673 674 return ret; 675 } 676 677 static int amd_pinconf_group_get(struct pinctrl_dev *pctldev, 678 unsigned int group, 679 unsigned long *config) 680 { 681 const unsigned *pins; 682 unsigned npins; 683 int ret; 684 685 ret = amd_get_group_pins(pctldev, group, &pins, &npins); 686 if (ret) 687 return ret; 688 689 if (amd_pinconf_get(pctldev, pins[0], config)) 690 return -ENOTSUPP; 691 692 return 0; 693 } 694 695 static int amd_pinconf_group_set(struct pinctrl_dev *pctldev, 696 unsigned group, unsigned long *configs, 697 unsigned num_configs) 698 { 699 const unsigned *pins; 700 unsigned npins; 701 int i, ret; 702 703 ret = amd_get_group_pins(pctldev, group, &pins, &npins); 704 if (ret) 705 return ret; 706 for (i = 0; i < npins; i++) { 707 if (amd_pinconf_set(pctldev, pins[i], configs, num_configs)) 708 return -ENOTSUPP; 709 } 710 return 0; 711 } 712 713 static const struct pinconf_ops amd_pinconf_ops = { 714 .pin_config_get = amd_pinconf_get, 715 .pin_config_set = amd_pinconf_set, 716 .pin_config_group_get = amd_pinconf_group_get, 717 .pin_config_group_set = amd_pinconf_group_set, 718 }; 719 720 static struct pinctrl_desc amd_pinctrl_desc = { 721 .pins = kerncz_pins, 722 .npins = ARRAY_SIZE(kerncz_pins), 723 .pctlops = &amd_pinctrl_ops, 724 .confops = &amd_pinconf_ops, 725 .owner = THIS_MODULE, 726 }; 727 728 static int amd_gpio_probe(struct platform_device *pdev) 729 { 730 int ret = 0; 731 int irq_base; 732 struct resource *res; 733 struct amd_gpio *gpio_dev; 734 735 gpio_dev = devm_kzalloc(&pdev->dev, 736 sizeof(struct amd_gpio), GFP_KERNEL); 737 if (!gpio_dev) 738 return -ENOMEM; 739 740 spin_lock_init(&gpio_dev->lock); 741 742 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 743 if (!res) { 744 dev_err(&pdev->dev, "Failed to get gpio io resource.\n"); 745 return -EINVAL; 746 } 747 748 gpio_dev->base = devm_ioremap_nocache(&pdev->dev, res->start, 749 resource_size(res)); 750 if (!gpio_dev->base) 751 return -ENOMEM; 752 753 irq_base = platform_get_irq(pdev, 0); 754 if (irq_base < 0) { 755 dev_err(&pdev->dev, "Failed to get gpio IRQ.\n"); 756 return -EINVAL; 757 } 758 759 gpio_dev->pdev = pdev; 760 gpio_dev->gc.direction_input = amd_gpio_direction_input; 761 gpio_dev->gc.direction_output = amd_gpio_direction_output; 762 gpio_dev->gc.get = amd_gpio_get_value; 763 gpio_dev->gc.set = amd_gpio_set_value; 764 gpio_dev->gc.set_debounce = amd_gpio_set_debounce; 765 gpio_dev->gc.dbg_show = amd_gpio_dbg_show; 766 767 gpio_dev->gc.base = 0; 768 gpio_dev->gc.label = pdev->name; 769 gpio_dev->gc.owner = THIS_MODULE; 770 gpio_dev->gc.parent = &pdev->dev; 771 gpio_dev->gc.ngpio = TOTAL_NUMBER_OF_PINS; 772 #if defined(CONFIG_OF_GPIO) 773 gpio_dev->gc.of_node = pdev->dev.of_node; 774 #endif 775 776 gpio_dev->groups = kerncz_groups; 777 gpio_dev->ngroups = ARRAY_SIZE(kerncz_groups); 778 779 amd_pinctrl_desc.name = dev_name(&pdev->dev); 780 gpio_dev->pctrl = devm_pinctrl_register(&pdev->dev, &amd_pinctrl_desc, 781 gpio_dev); 782 if (IS_ERR(gpio_dev->pctrl)) { 783 dev_err(&pdev->dev, "Couldn't register pinctrl driver\n"); 784 return PTR_ERR(gpio_dev->pctrl); 785 } 786 787 ret = gpiochip_add_data(&gpio_dev->gc, gpio_dev); 788 if (ret) 789 return ret; 790 791 ret = gpiochip_add_pin_range(&gpio_dev->gc, dev_name(&pdev->dev), 792 0, 0, TOTAL_NUMBER_OF_PINS); 793 if (ret) { 794 dev_err(&pdev->dev, "Failed to add pin range\n"); 795 goto out2; 796 } 797 798 ret = gpiochip_irqchip_add(&gpio_dev->gc, 799 &amd_gpio_irqchip, 800 0, 801 handle_simple_irq, 802 IRQ_TYPE_NONE); 803 if (ret) { 804 dev_err(&pdev->dev, "could not add irqchip\n"); 805 ret = -ENODEV; 806 goto out2; 807 } 808 809 gpiochip_set_chained_irqchip(&gpio_dev->gc, 810 &amd_gpio_irqchip, 811 irq_base, 812 amd_gpio_irq_handler); 813 814 platform_set_drvdata(pdev, gpio_dev); 815 816 dev_dbg(&pdev->dev, "amd gpio driver loaded\n"); 817 return ret; 818 819 out2: 820 gpiochip_remove(&gpio_dev->gc); 821 822 return ret; 823 } 824 825 static int amd_gpio_remove(struct platform_device *pdev) 826 { 827 struct amd_gpio *gpio_dev; 828 829 gpio_dev = platform_get_drvdata(pdev); 830 831 gpiochip_remove(&gpio_dev->gc); 832 833 return 0; 834 } 835 836 static const struct acpi_device_id amd_gpio_acpi_match[] = { 837 { "AMD0030", 0 }, 838 { "AMDI0030", 0}, 839 { }, 840 }; 841 MODULE_DEVICE_TABLE(acpi, amd_gpio_acpi_match); 842 843 static struct platform_driver amd_gpio_driver = { 844 .driver = { 845 .name = "amd_gpio", 846 .acpi_match_table = ACPI_PTR(amd_gpio_acpi_match), 847 }, 848 .probe = amd_gpio_probe, 849 .remove = amd_gpio_remove, 850 }; 851 852 module_platform_driver(amd_gpio_driver); 853 854 MODULE_LICENSE("GPL v2"); 855 MODULE_AUTHOR("Ken Xue <Ken.Xue@amd.com>, Jeff Wu <Jeff.Wu@amd.com>"); 856 MODULE_DESCRIPTION("AMD GPIO pinctrl driver"); 857