1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * Copyright 2015 IBM Corp. 4 * 5 * Joel Stanley <joel@jms.id.au> 6 */ 7 8#include <linux/clk.h> 9#include <linux/gpio/aspeed.h> 10#include <linux/gpio/driver.h> 11#include <linux/hashtable.h> 12#include <linux/init.h> 13#include <linux/io.h> 14#include <linux/kernel.h> 15#include <linux/module.h> 16#include <linux/pinctrl/consumer.h> 17#include <linux/platform_device.h> 18#include <linux/seq_file.h> 19#include <linux/spinlock.h> 20#include <linux/string.h> 21 22#include <asm/div64.h> 23 24/* 25 * These two headers aren't meant to be used by GPIO drivers. We need 26 * them in order to access gpio_chip_hwgpio() which we need to implement 27 * the aspeed specific API which allows the coprocessor to request 28 * access to some GPIOs and to arbitrate between coprocessor and ARM. 29 */ 30#include <linux/gpio/consumer.h> 31#include "gpiolib.h" 32 33struct aspeed_bank_props { 34 unsigned int bank; 35 u32 input; 36 u32 output; 37}; 38 39struct aspeed_gpio_config { 40 unsigned int nr_gpios; 41 const struct aspeed_bank_props *props; 42}; 43 44/* 45 * @offset_timer: Maps an offset to an @timer_users index, or zero if disabled 46 * @timer_users: Tracks the number of users for each timer 47 * 48 * The @timer_users has four elements but the first element is unused. This is 49 * to simplify accounting and indexing, as a zero value in @offset_timer 50 * represents disabled debouncing for the GPIO. Any other value for an element 51 * of @offset_timer is used as an index into @timer_users. This behaviour of 52 * the zero value aligns with the behaviour of zero built from the timer 53 * configuration registers (i.e. debouncing is disabled). 54 */ 55struct aspeed_gpio { 56 struct gpio_chip chip; 57 struct device *dev; 58 raw_spinlock_t lock; 59 void __iomem *base; 60 int irq; 61 const struct aspeed_gpio_config *config; 62 63 u8 *offset_timer; 64 unsigned int timer_users[4]; 65 struct clk *clk; 66 67 u32 *dcache; 68 u8 *cf_copro_bankmap; 69}; 70 71struct aspeed_gpio_bank { 72 uint16_t val_regs; /* +0: Rd: read input value, Wr: set write latch 73 * +4: Rd/Wr: Direction (0=in, 1=out) 74 */ 75 uint16_t rdata_reg; /* Rd: read write latch, Wr: <none> */ 76 uint16_t irq_regs; 77 uint16_t debounce_regs; 78 uint16_t tolerance_regs; 79 uint16_t cmdsrc_regs; 80 const char names[4][3]; 81}; 82 83/* 84 * Note: The "value" register returns the input value sampled on the 85 * line even when the GPIO is configured as an output. Since 86 * that input goes through synchronizers, writing, then reading 87 * back may not return the written value right away. 88 * 89 * The "rdata" register returns the content of the write latch 90 * and thus can be used to read back what was last written 91 * reliably. 92 */ 93 94static const int debounce_timers[4] = { 0x00, 0x50, 0x54, 0x58 }; 95 96static const struct aspeed_gpio_copro_ops *copro_ops; 97static void *copro_data; 98 99static const struct aspeed_gpio_bank aspeed_gpio_banks[] = { 100 { 101 .val_regs = 0x0000, 102 .rdata_reg = 0x00c0, 103 .irq_regs = 0x0008, 104 .debounce_regs = 0x0040, 105 .tolerance_regs = 0x001c, 106 .cmdsrc_regs = 0x0060, 107 .names = { "A", "B", "C", "D" }, 108 }, 109 { 110 .val_regs = 0x0020, 111 .rdata_reg = 0x00c4, 112 .irq_regs = 0x0028, 113 .debounce_regs = 0x0048, 114 .tolerance_regs = 0x003c, 115 .cmdsrc_regs = 0x0068, 116 .names = { "E", "F", "G", "H" }, 117 }, 118 { 119 .val_regs = 0x0070, 120 .rdata_reg = 0x00c8, 121 .irq_regs = 0x0098, 122 .debounce_regs = 0x00b0, 123 .tolerance_regs = 0x00ac, 124 .cmdsrc_regs = 0x0090, 125 .names = { "I", "J", "K", "L" }, 126 }, 127 { 128 .val_regs = 0x0078, 129 .rdata_reg = 0x00cc, 130 .irq_regs = 0x00e8, 131 .debounce_regs = 0x0100, 132 .tolerance_regs = 0x00fc, 133 .cmdsrc_regs = 0x00e0, 134 .names = { "M", "N", "O", "P" }, 135 }, 136 { 137 .val_regs = 0x0080, 138 .rdata_reg = 0x00d0, 139 .irq_regs = 0x0118, 140 .debounce_regs = 0x0130, 141 .tolerance_regs = 0x012c, 142 .cmdsrc_regs = 0x0110, 143 .names = { "Q", "R", "S", "T" }, 144 }, 145 { 146 .val_regs = 0x0088, 147 .rdata_reg = 0x00d4, 148 .irq_regs = 0x0148, 149 .debounce_regs = 0x0160, 150 .tolerance_regs = 0x015c, 151 .cmdsrc_regs = 0x0140, 152 .names = { "U", "V", "W", "X" }, 153 }, 154 { 155 .val_regs = 0x01E0, 156 .rdata_reg = 0x00d8, 157 .irq_regs = 0x0178, 158 .debounce_regs = 0x0190, 159 .tolerance_regs = 0x018c, 160 .cmdsrc_regs = 0x0170, 161 .names = { "Y", "Z", "AA", "AB" }, 162 }, 163 { 164 .val_regs = 0x01e8, 165 .rdata_reg = 0x00dc, 166 .irq_regs = 0x01a8, 167 .debounce_regs = 0x01c0, 168 .tolerance_regs = 0x01bc, 169 .cmdsrc_regs = 0x01a0, 170 .names = { "AC", "", "", "" }, 171 }, 172}; 173 174enum aspeed_gpio_reg { 175 reg_val, 176 reg_rdata, 177 reg_dir, 178 reg_irq_enable, 179 reg_irq_type0, 180 reg_irq_type1, 181 reg_irq_type2, 182 reg_irq_status, 183 reg_debounce_sel1, 184 reg_debounce_sel2, 185 reg_tolerance, 186 reg_cmdsrc0, 187 reg_cmdsrc1, 188}; 189 190#define GPIO_VAL_VALUE 0x00 191#define GPIO_VAL_DIR 0x04 192 193#define GPIO_IRQ_ENABLE 0x00 194#define GPIO_IRQ_TYPE0 0x04 195#define GPIO_IRQ_TYPE1 0x08 196#define GPIO_IRQ_TYPE2 0x0c 197#define GPIO_IRQ_STATUS 0x10 198 199#define GPIO_DEBOUNCE_SEL1 0x00 200#define GPIO_DEBOUNCE_SEL2 0x04 201 202#define GPIO_CMDSRC_0 0x00 203#define GPIO_CMDSRC_1 0x04 204#define GPIO_CMDSRC_ARM 0 205#define GPIO_CMDSRC_LPC 1 206#define GPIO_CMDSRC_COLDFIRE 2 207#define GPIO_CMDSRC_RESERVED 3 208 209/* This will be resolved at compile time */ 210static inline void __iomem *bank_reg(struct aspeed_gpio *gpio, 211 const struct aspeed_gpio_bank *bank, 212 const enum aspeed_gpio_reg reg) 213{ 214 switch (reg) { 215 case reg_val: 216 return gpio->base + bank->val_regs + GPIO_VAL_VALUE; 217 case reg_rdata: 218 return gpio->base + bank->rdata_reg; 219 case reg_dir: 220 return gpio->base + bank->val_regs + GPIO_VAL_DIR; 221 case reg_irq_enable: 222 return gpio->base + bank->irq_regs + GPIO_IRQ_ENABLE; 223 case reg_irq_type0: 224 return gpio->base + bank->irq_regs + GPIO_IRQ_TYPE0; 225 case reg_irq_type1: 226 return gpio->base + bank->irq_regs + GPIO_IRQ_TYPE1; 227 case reg_irq_type2: 228 return gpio->base + bank->irq_regs + GPIO_IRQ_TYPE2; 229 case reg_irq_status: 230 return gpio->base + bank->irq_regs + GPIO_IRQ_STATUS; 231 case reg_debounce_sel1: 232 return gpio->base + bank->debounce_regs + GPIO_DEBOUNCE_SEL1; 233 case reg_debounce_sel2: 234 return gpio->base + bank->debounce_regs + GPIO_DEBOUNCE_SEL2; 235 case reg_tolerance: 236 return gpio->base + bank->tolerance_regs; 237 case reg_cmdsrc0: 238 return gpio->base + bank->cmdsrc_regs + GPIO_CMDSRC_0; 239 case reg_cmdsrc1: 240 return gpio->base + bank->cmdsrc_regs + GPIO_CMDSRC_1; 241 } 242 BUG(); 243} 244 245#define GPIO_BANK(x) ((x) >> 5) 246#define GPIO_OFFSET(x) ((x) & 0x1f) 247#define GPIO_BIT(x) BIT(GPIO_OFFSET(x)) 248 249#define _GPIO_SET_DEBOUNCE(t, o, i) ((!!((t) & BIT(i))) << GPIO_OFFSET(o)) 250#define GPIO_SET_DEBOUNCE1(t, o) _GPIO_SET_DEBOUNCE(t, o, 1) 251#define GPIO_SET_DEBOUNCE2(t, o) _GPIO_SET_DEBOUNCE(t, o, 0) 252 253static const struct aspeed_gpio_bank *to_bank(unsigned int offset) 254{ 255 unsigned int bank = GPIO_BANK(offset); 256 257 WARN_ON(bank >= ARRAY_SIZE(aspeed_gpio_banks)); 258 return &aspeed_gpio_banks[bank]; 259} 260 261static inline bool is_bank_props_sentinel(const struct aspeed_bank_props *props) 262{ 263 return !(props->input || props->output); 264} 265 266static inline const struct aspeed_bank_props *find_bank_props( 267 struct aspeed_gpio *gpio, unsigned int offset) 268{ 269 const struct aspeed_bank_props *props = gpio->config->props; 270 271 while (!is_bank_props_sentinel(props)) { 272 if (props->bank == GPIO_BANK(offset)) 273 return props; 274 props++; 275 } 276 277 return NULL; 278} 279 280static inline bool have_gpio(struct aspeed_gpio *gpio, unsigned int offset) 281{ 282 const struct aspeed_bank_props *props = find_bank_props(gpio, offset); 283 const struct aspeed_gpio_bank *bank = to_bank(offset); 284 unsigned int group = GPIO_OFFSET(offset) / 8; 285 286 return bank->names[group][0] != '\0' && 287 (!props || ((props->input | props->output) & GPIO_BIT(offset))); 288} 289 290static inline bool have_input(struct aspeed_gpio *gpio, unsigned int offset) 291{ 292 const struct aspeed_bank_props *props = find_bank_props(gpio, offset); 293 294 return !props || (props->input & GPIO_BIT(offset)); 295} 296 297#define have_irq(g, o) have_input((g), (o)) 298#define have_debounce(g, o) have_input((g), (o)) 299 300static inline bool have_output(struct aspeed_gpio *gpio, unsigned int offset) 301{ 302 const struct aspeed_bank_props *props = find_bank_props(gpio, offset); 303 304 return !props || (props->output & GPIO_BIT(offset)); 305} 306 307static void aspeed_gpio_change_cmd_source(struct aspeed_gpio *gpio, 308 const struct aspeed_gpio_bank *bank, 309 int bindex, int cmdsrc) 310{ 311 void __iomem *c0 = bank_reg(gpio, bank, reg_cmdsrc0); 312 void __iomem *c1 = bank_reg(gpio, bank, reg_cmdsrc1); 313 u32 bit, reg; 314 315 /* 316 * Each register controls 4 banks, so take the bottom 2 317 * bits of the bank index, and use them to select the 318 * right control bit (0, 8, 16 or 24). 319 */ 320 bit = BIT((bindex & 3) << 3); 321 322 /* Source 1 first to avoid illegal 11 combination */ 323 reg = ioread32(c1); 324 if (cmdsrc & 2) 325 reg |= bit; 326 else 327 reg &= ~bit; 328 iowrite32(reg, c1); 329 330 /* Then Source 0 */ 331 reg = ioread32(c0); 332 if (cmdsrc & 1) 333 reg |= bit; 334 else 335 reg &= ~bit; 336 iowrite32(reg, c0); 337} 338 339static bool aspeed_gpio_copro_request(struct aspeed_gpio *gpio, 340 unsigned int offset) 341{ 342 const struct aspeed_gpio_bank *bank = to_bank(offset); 343 344 if (!copro_ops || !gpio->cf_copro_bankmap) 345 return false; 346 if (!gpio->cf_copro_bankmap[offset >> 3]) 347 return false; 348 if (!copro_ops->request_access) 349 return false; 350 351 /* Pause the coprocessor */ 352 copro_ops->request_access(copro_data); 353 354 /* Change command source back to ARM */ 355 aspeed_gpio_change_cmd_source(gpio, bank, offset >> 3, GPIO_CMDSRC_ARM); 356 357 /* Update cache */ 358 gpio->dcache[GPIO_BANK(offset)] = ioread32(bank_reg(gpio, bank, reg_rdata)); 359 360 return true; 361} 362 363static void aspeed_gpio_copro_release(struct aspeed_gpio *gpio, 364 unsigned int offset) 365{ 366 const struct aspeed_gpio_bank *bank = to_bank(offset); 367 368 if (!copro_ops || !gpio->cf_copro_bankmap) 369 return; 370 if (!gpio->cf_copro_bankmap[offset >> 3]) 371 return; 372 if (!copro_ops->release_access) 373 return; 374 375 /* Change command source back to ColdFire */ 376 aspeed_gpio_change_cmd_source(gpio, bank, offset >> 3, 377 GPIO_CMDSRC_COLDFIRE); 378 379 /* Restart the coprocessor */ 380 copro_ops->release_access(copro_data); 381} 382 383static int aspeed_gpio_get(struct gpio_chip *gc, unsigned int offset) 384{ 385 struct aspeed_gpio *gpio = gpiochip_get_data(gc); 386 const struct aspeed_gpio_bank *bank = to_bank(offset); 387 388 return !!(ioread32(bank_reg(gpio, bank, reg_val)) & GPIO_BIT(offset)); 389} 390 391static void __aspeed_gpio_set(struct gpio_chip *gc, unsigned int offset, 392 int val) 393{ 394 struct aspeed_gpio *gpio = gpiochip_get_data(gc); 395 const struct aspeed_gpio_bank *bank = to_bank(offset); 396 void __iomem *addr; 397 u32 reg; 398 399 addr = bank_reg(gpio, bank, reg_val); 400 reg = gpio->dcache[GPIO_BANK(offset)]; 401 402 if (val) 403 reg |= GPIO_BIT(offset); 404 else 405 reg &= ~GPIO_BIT(offset); 406 gpio->dcache[GPIO_BANK(offset)] = reg; 407 408 iowrite32(reg, addr); 409} 410 411static void aspeed_gpio_set(struct gpio_chip *gc, unsigned int offset, 412 int val) 413{ 414 struct aspeed_gpio *gpio = gpiochip_get_data(gc); 415 unsigned long flags; 416 bool copro; 417 418 raw_spin_lock_irqsave(&gpio->lock, flags); 419 copro = aspeed_gpio_copro_request(gpio, offset); 420 421 __aspeed_gpio_set(gc, offset, val); 422 423 if (copro) 424 aspeed_gpio_copro_release(gpio, offset); 425 raw_spin_unlock_irqrestore(&gpio->lock, flags); 426} 427 428static int aspeed_gpio_dir_in(struct gpio_chip *gc, unsigned int offset) 429{ 430 struct aspeed_gpio *gpio = gpiochip_get_data(gc); 431 const struct aspeed_gpio_bank *bank = to_bank(offset); 432 void __iomem *addr = bank_reg(gpio, bank, reg_dir); 433 unsigned long flags; 434 bool copro; 435 u32 reg; 436 437 if (!have_input(gpio, offset)) 438 return -ENOTSUPP; 439 440 raw_spin_lock_irqsave(&gpio->lock, flags); 441 442 reg = ioread32(addr); 443 reg &= ~GPIO_BIT(offset); 444 445 copro = aspeed_gpio_copro_request(gpio, offset); 446 iowrite32(reg, addr); 447 if (copro) 448 aspeed_gpio_copro_release(gpio, offset); 449 450 raw_spin_unlock_irqrestore(&gpio->lock, flags); 451 452 return 0; 453} 454 455static int aspeed_gpio_dir_out(struct gpio_chip *gc, 456 unsigned int offset, int val) 457{ 458 struct aspeed_gpio *gpio = gpiochip_get_data(gc); 459 const struct aspeed_gpio_bank *bank = to_bank(offset); 460 void __iomem *addr = bank_reg(gpio, bank, reg_dir); 461 unsigned long flags; 462 bool copro; 463 u32 reg; 464 465 if (!have_output(gpio, offset)) 466 return -ENOTSUPP; 467 468 raw_spin_lock_irqsave(&gpio->lock, flags); 469 470 reg = ioread32(addr); 471 reg |= GPIO_BIT(offset); 472 473 copro = aspeed_gpio_copro_request(gpio, offset); 474 __aspeed_gpio_set(gc, offset, val); 475 iowrite32(reg, addr); 476 477 if (copro) 478 aspeed_gpio_copro_release(gpio, offset); 479 raw_spin_unlock_irqrestore(&gpio->lock, flags); 480 481 return 0; 482} 483 484static int aspeed_gpio_get_direction(struct gpio_chip *gc, unsigned int offset) 485{ 486 struct aspeed_gpio *gpio = gpiochip_get_data(gc); 487 const struct aspeed_gpio_bank *bank = to_bank(offset); 488 unsigned long flags; 489 u32 val; 490 491 if (!have_input(gpio, offset)) 492 return GPIO_LINE_DIRECTION_OUT; 493 494 if (!have_output(gpio, offset)) 495 return GPIO_LINE_DIRECTION_IN; 496 497 raw_spin_lock_irqsave(&gpio->lock, flags); 498 499 val = ioread32(bank_reg(gpio, bank, reg_dir)) & GPIO_BIT(offset); 500 501 raw_spin_unlock_irqrestore(&gpio->lock, flags); 502 503 return val ? GPIO_LINE_DIRECTION_OUT : GPIO_LINE_DIRECTION_IN; 504} 505 506static inline int irqd_to_aspeed_gpio_data(struct irq_data *d, 507 struct aspeed_gpio **gpio, 508 const struct aspeed_gpio_bank **bank, 509 u32 *bit, int *offset) 510{ 511 struct aspeed_gpio *internal; 512 513 *offset = irqd_to_hwirq(d); 514 515 internal = irq_data_get_irq_chip_data(d); 516 517 /* This might be a bit of a questionable place to check */ 518 if (!have_irq(internal, *offset)) 519 return -ENOTSUPP; 520 521 *gpio = internal; 522 *bank = to_bank(*offset); 523 *bit = GPIO_BIT(*offset); 524 525 return 0; 526} 527 528static void aspeed_gpio_irq_ack(struct irq_data *d) 529{ 530 const struct aspeed_gpio_bank *bank; 531 struct aspeed_gpio *gpio; 532 unsigned long flags; 533 void __iomem *status_addr; 534 int rc, offset; 535 bool copro; 536 u32 bit; 537 538 rc = irqd_to_aspeed_gpio_data(d, &gpio, &bank, &bit, &offset); 539 if (rc) 540 return; 541 542 status_addr = bank_reg(gpio, bank, reg_irq_status); 543 544 raw_spin_lock_irqsave(&gpio->lock, flags); 545 copro = aspeed_gpio_copro_request(gpio, offset); 546 547 iowrite32(bit, status_addr); 548 549 if (copro) 550 aspeed_gpio_copro_release(gpio, offset); 551 raw_spin_unlock_irqrestore(&gpio->lock, flags); 552} 553 554static void aspeed_gpio_irq_set_mask(struct irq_data *d, bool set) 555{ 556 const struct aspeed_gpio_bank *bank; 557 struct aspeed_gpio *gpio; 558 unsigned long flags; 559 u32 reg, bit; 560 void __iomem *addr; 561 int rc, offset; 562 bool copro; 563 564 rc = irqd_to_aspeed_gpio_data(d, &gpio, &bank, &bit, &offset); 565 if (rc) 566 return; 567 568 addr = bank_reg(gpio, bank, reg_irq_enable); 569 570 /* Unmasking the IRQ */ 571 if (set) 572 gpiochip_enable_irq(&gpio->chip, irqd_to_hwirq(d)); 573 574 raw_spin_lock_irqsave(&gpio->lock, flags); 575 copro = aspeed_gpio_copro_request(gpio, offset); 576 577 reg = ioread32(addr); 578 if (set) 579 reg |= bit; 580 else 581 reg &= ~bit; 582 iowrite32(reg, addr); 583 584 if (copro) 585 aspeed_gpio_copro_release(gpio, offset); 586 raw_spin_unlock_irqrestore(&gpio->lock, flags); 587 588 /* Masking the IRQ */ 589 if (!set) 590 gpiochip_disable_irq(&gpio->chip, irqd_to_hwirq(d)); 591} 592 593static void aspeed_gpio_irq_mask(struct irq_data *d) 594{ 595 aspeed_gpio_irq_set_mask(d, false); 596} 597 598static void aspeed_gpio_irq_unmask(struct irq_data *d) 599{ 600 aspeed_gpio_irq_set_mask(d, true); 601} 602 603static int aspeed_gpio_set_type(struct irq_data *d, unsigned int type) 604{ 605 u32 type0 = 0; 606 u32 type1 = 0; 607 u32 type2 = 0; 608 u32 bit, reg; 609 const struct aspeed_gpio_bank *bank; 610 irq_flow_handler_t handler; 611 struct aspeed_gpio *gpio; 612 unsigned long flags; 613 void __iomem *addr; 614 int rc, offset; 615 bool copro; 616 617 rc = irqd_to_aspeed_gpio_data(d, &gpio, &bank, &bit, &offset); 618 if (rc) 619 return -EINVAL; 620 621 switch (type & IRQ_TYPE_SENSE_MASK) { 622 case IRQ_TYPE_EDGE_BOTH: 623 type2 |= bit; 624 fallthrough; 625 case IRQ_TYPE_EDGE_RISING: 626 type0 |= bit; 627 fallthrough; 628 case IRQ_TYPE_EDGE_FALLING: 629 handler = handle_edge_irq; 630 break; 631 case IRQ_TYPE_LEVEL_HIGH: 632 type0 |= bit; 633 fallthrough; 634 case IRQ_TYPE_LEVEL_LOW: 635 type1 |= bit; 636 handler = handle_level_irq; 637 break; 638 default: 639 return -EINVAL; 640 } 641 642 raw_spin_lock_irqsave(&gpio->lock, flags); 643 copro = aspeed_gpio_copro_request(gpio, offset); 644 645 addr = bank_reg(gpio, bank, reg_irq_type0); 646 reg = ioread32(addr); 647 reg = (reg & ~bit) | type0; 648 iowrite32(reg, addr); 649 650 addr = bank_reg(gpio, bank, reg_irq_type1); 651 reg = ioread32(addr); 652 reg = (reg & ~bit) | type1; 653 iowrite32(reg, addr); 654 655 addr = bank_reg(gpio, bank, reg_irq_type2); 656 reg = ioread32(addr); 657 reg = (reg & ~bit) | type2; 658 iowrite32(reg, addr); 659 660 if (copro) 661 aspeed_gpio_copro_release(gpio, offset); 662 raw_spin_unlock_irqrestore(&gpio->lock, flags); 663 664 irq_set_handler_locked(d, handler); 665 666 return 0; 667} 668 669static void aspeed_gpio_irq_handler(struct irq_desc *desc) 670{ 671 struct gpio_chip *gc = irq_desc_get_handler_data(desc); 672 struct irq_chip *ic = irq_desc_get_chip(desc); 673 struct aspeed_gpio *data = gpiochip_get_data(gc); 674 unsigned int i, p, banks; 675 unsigned long reg; 676 struct aspeed_gpio *gpio = gpiochip_get_data(gc); 677 678 chained_irq_enter(ic, desc); 679 680 banks = DIV_ROUND_UP(gpio->chip.ngpio, 32); 681 for (i = 0; i < banks; i++) { 682 const struct aspeed_gpio_bank *bank = &aspeed_gpio_banks[i]; 683 684 reg = ioread32(bank_reg(data, bank, reg_irq_status)); 685 686 for_each_set_bit(p, ®, 32) 687 generic_handle_domain_irq(gc->irq.domain, i * 32 + p); 688 } 689 690 chained_irq_exit(ic, desc); 691} 692 693static void aspeed_init_irq_valid_mask(struct gpio_chip *gc, 694 unsigned long *valid_mask, 695 unsigned int ngpios) 696{ 697 struct aspeed_gpio *gpio = gpiochip_get_data(gc); 698 const struct aspeed_bank_props *props = gpio->config->props; 699 700 while (!is_bank_props_sentinel(props)) { 701 unsigned int offset; 702 const unsigned long int input = props->input; 703 704 /* Pretty crummy approach, but similar to GPIO core */ 705 for_each_clear_bit(offset, &input, 32) { 706 unsigned int i = props->bank * 32 + offset; 707 708 if (i >= gpio->chip.ngpio) 709 break; 710 711 clear_bit(i, valid_mask); 712 } 713 714 props++; 715 } 716} 717 718static int aspeed_gpio_reset_tolerance(struct gpio_chip *chip, 719 unsigned int offset, bool enable) 720{ 721 struct aspeed_gpio *gpio = gpiochip_get_data(chip); 722 unsigned long flags; 723 void __iomem *treg; 724 bool copro; 725 u32 val; 726 727 treg = bank_reg(gpio, to_bank(offset), reg_tolerance); 728 729 raw_spin_lock_irqsave(&gpio->lock, flags); 730 copro = aspeed_gpio_copro_request(gpio, offset); 731 732 val = readl(treg); 733 734 if (enable) 735 val |= GPIO_BIT(offset); 736 else 737 val &= ~GPIO_BIT(offset); 738 739 writel(val, treg); 740 741 if (copro) 742 aspeed_gpio_copro_release(gpio, offset); 743 raw_spin_unlock_irqrestore(&gpio->lock, flags); 744 745 return 0; 746} 747 748static int aspeed_gpio_request(struct gpio_chip *chip, unsigned int offset) 749{ 750 if (!have_gpio(gpiochip_get_data(chip), offset)) 751 return -ENODEV; 752 753 return pinctrl_gpio_request(chip, offset); 754} 755 756static void aspeed_gpio_free(struct gpio_chip *chip, unsigned int offset) 757{ 758 pinctrl_gpio_free(chip, offset); 759} 760 761static int usecs_to_cycles(struct aspeed_gpio *gpio, unsigned long usecs, 762 u32 *cycles) 763{ 764 u64 rate; 765 u64 n; 766 u32 r; 767 768 rate = clk_get_rate(gpio->clk); 769 if (!rate) 770 return -ENOTSUPP; 771 772 n = rate * usecs; 773 r = do_div(n, 1000000); 774 775 if (n >= U32_MAX) 776 return -ERANGE; 777 778 /* At least as long as the requested time */ 779 *cycles = n + (!!r); 780 781 return 0; 782} 783 784/* Call under gpio->lock */ 785static int register_allocated_timer(struct aspeed_gpio *gpio, 786 unsigned int offset, unsigned int timer) 787{ 788 if (WARN(gpio->offset_timer[offset] != 0, 789 "Offset %d already allocated timer %d\n", 790 offset, gpio->offset_timer[offset])) 791 return -EINVAL; 792 793 if (WARN(gpio->timer_users[timer] == UINT_MAX, 794 "Timer user count would overflow\n")) 795 return -EPERM; 796 797 gpio->offset_timer[offset] = timer; 798 gpio->timer_users[timer]++; 799 800 return 0; 801} 802 803/* Call under gpio->lock */ 804static int unregister_allocated_timer(struct aspeed_gpio *gpio, 805 unsigned int offset) 806{ 807 if (WARN(gpio->offset_timer[offset] == 0, 808 "No timer allocated to offset %d\n", offset)) 809 return -EINVAL; 810 811 if (WARN(gpio->timer_users[gpio->offset_timer[offset]] == 0, 812 "No users recorded for timer %d\n", 813 gpio->offset_timer[offset])) 814 return -EINVAL; 815 816 gpio->timer_users[gpio->offset_timer[offset]]--; 817 gpio->offset_timer[offset] = 0; 818 819 return 0; 820} 821 822/* Call under gpio->lock */ 823static inline bool timer_allocation_registered(struct aspeed_gpio *gpio, 824 unsigned int offset) 825{ 826 return gpio->offset_timer[offset] > 0; 827} 828 829/* Call under gpio->lock */ 830static void configure_timer(struct aspeed_gpio *gpio, unsigned int offset, 831 unsigned int timer) 832{ 833 const struct aspeed_gpio_bank *bank = to_bank(offset); 834 const u32 mask = GPIO_BIT(offset); 835 void __iomem *addr; 836 u32 val; 837 838 /* Note: Debounce timer isn't under control of the command 839 * source registers, so no need to sync with the coprocessor 840 */ 841 addr = bank_reg(gpio, bank, reg_debounce_sel1); 842 val = ioread32(addr); 843 iowrite32((val & ~mask) | GPIO_SET_DEBOUNCE1(timer, offset), addr); 844 845 addr = bank_reg(gpio, bank, reg_debounce_sel2); 846 val = ioread32(addr); 847 iowrite32((val & ~mask) | GPIO_SET_DEBOUNCE2(timer, offset), addr); 848} 849 850static int enable_debounce(struct gpio_chip *chip, unsigned int offset, 851 unsigned long usecs) 852{ 853 struct aspeed_gpio *gpio = gpiochip_get_data(chip); 854 u32 requested_cycles; 855 unsigned long flags; 856 int rc; 857 int i; 858 859 if (!gpio->clk) 860 return -EINVAL; 861 862 rc = usecs_to_cycles(gpio, usecs, &requested_cycles); 863 if (rc < 0) { 864 dev_warn(chip->parent, "Failed to convert %luus to cycles at %luHz: %d\n", 865 usecs, clk_get_rate(gpio->clk), rc); 866 return rc; 867 } 868 869 raw_spin_lock_irqsave(&gpio->lock, flags); 870 871 if (timer_allocation_registered(gpio, offset)) { 872 rc = unregister_allocated_timer(gpio, offset); 873 if (rc < 0) 874 goto out; 875 } 876 877 /* Try to find a timer already configured for the debounce period */ 878 for (i = 1; i < ARRAY_SIZE(debounce_timers); i++) { 879 u32 cycles; 880 881 cycles = ioread32(gpio->base + debounce_timers[i]); 882 if (requested_cycles == cycles) 883 break; 884 } 885 886 if (i == ARRAY_SIZE(debounce_timers)) { 887 int j; 888 889 /* 890 * As there are no timers configured for the requested debounce 891 * period, find an unused timer instead 892 */ 893 for (j = 1; j < ARRAY_SIZE(gpio->timer_users); j++) { 894 if (gpio->timer_users[j] == 0) 895 break; 896 } 897 898 if (j == ARRAY_SIZE(gpio->timer_users)) { 899 dev_warn(chip->parent, 900 "Debounce timers exhausted, cannot debounce for period %luus\n", 901 usecs); 902 903 rc = -EPERM; 904 905 /* 906 * We already adjusted the accounting to remove @offset 907 * as a user of its previous timer, so also configure 908 * the hardware so @offset has timers disabled for 909 * consistency. 910 */ 911 configure_timer(gpio, offset, 0); 912 goto out; 913 } 914 915 i = j; 916 917 iowrite32(requested_cycles, gpio->base + debounce_timers[i]); 918 } 919 920 if (WARN(i == 0, "Cannot register index of disabled timer\n")) { 921 rc = -EINVAL; 922 goto out; 923 } 924 925 register_allocated_timer(gpio, offset, i); 926 configure_timer(gpio, offset, i); 927 928out: 929 raw_spin_unlock_irqrestore(&gpio->lock, flags); 930 931 return rc; 932} 933 934static int disable_debounce(struct gpio_chip *chip, unsigned int offset) 935{ 936 struct aspeed_gpio *gpio = gpiochip_get_data(chip); 937 unsigned long flags; 938 int rc; 939 940 raw_spin_lock_irqsave(&gpio->lock, flags); 941 942 rc = unregister_allocated_timer(gpio, offset); 943 if (!rc) 944 configure_timer(gpio, offset, 0); 945 946 raw_spin_unlock_irqrestore(&gpio->lock, flags); 947 948 return rc; 949} 950 951static int set_debounce(struct gpio_chip *chip, unsigned int offset, 952 unsigned long usecs) 953{ 954 struct aspeed_gpio *gpio = gpiochip_get_data(chip); 955 956 if (!have_debounce(gpio, offset)) 957 return -ENOTSUPP; 958 959 if (usecs) 960 return enable_debounce(chip, offset, usecs); 961 962 return disable_debounce(chip, offset); 963} 964 965static int aspeed_gpio_set_config(struct gpio_chip *chip, unsigned int offset, 966 unsigned long config) 967{ 968 unsigned long param = pinconf_to_config_param(config); 969 u32 arg = pinconf_to_config_argument(config); 970 971 if (param == PIN_CONFIG_INPUT_DEBOUNCE) 972 return set_debounce(chip, offset, arg); 973 else if (param == PIN_CONFIG_BIAS_DISABLE || 974 param == PIN_CONFIG_BIAS_PULL_DOWN || 975 param == PIN_CONFIG_DRIVE_STRENGTH) 976 return pinctrl_gpio_set_config(chip, offset, config); 977 else if (param == PIN_CONFIG_DRIVE_OPEN_DRAIN || 978 param == PIN_CONFIG_DRIVE_OPEN_SOURCE) 979 /* Return -ENOTSUPP to trigger emulation, as per datasheet */ 980 return -ENOTSUPP; 981 else if (param == PIN_CONFIG_PERSIST_STATE) 982 return aspeed_gpio_reset_tolerance(chip, offset, arg); 983 984 return -ENOTSUPP; 985} 986 987/** 988 * aspeed_gpio_copro_set_ops - Sets the callbacks used for handshaking with 989 * the coprocessor for shared GPIO banks 990 * @ops: The callbacks 991 * @data: Pointer passed back to the callbacks 992 */ 993int aspeed_gpio_copro_set_ops(const struct aspeed_gpio_copro_ops *ops, void *data) 994{ 995 copro_data = data; 996 copro_ops = ops; 997 998 return 0; 999} 1000EXPORT_SYMBOL_GPL(aspeed_gpio_copro_set_ops); 1001 1002/** 1003 * aspeed_gpio_copro_grab_gpio - Mark a GPIO used by the coprocessor. The entire 1004 * bank gets marked and any access from the ARM will 1005 * result in handshaking via callbacks. 1006 * @desc: The GPIO to be marked 1007 * @vreg_offset: If non-NULL, returns the value register offset in the GPIO space 1008 * @dreg_offset: If non-NULL, returns the data latch register offset in the GPIO space 1009 * @bit: If non-NULL, returns the bit number of the GPIO in the registers 1010 */ 1011int aspeed_gpio_copro_grab_gpio(struct gpio_desc *desc, 1012 u16 *vreg_offset, u16 *dreg_offset, u8 *bit) 1013{ 1014 struct gpio_chip *chip = gpiod_to_chip(desc); 1015 struct aspeed_gpio *gpio = gpiochip_get_data(chip); 1016 int rc = 0, bindex, offset = gpio_chip_hwgpio(desc); 1017 const struct aspeed_gpio_bank *bank = to_bank(offset); 1018 unsigned long flags; 1019 1020 if (!gpio->cf_copro_bankmap) 1021 gpio->cf_copro_bankmap = kzalloc(gpio->chip.ngpio >> 3, GFP_KERNEL); 1022 if (!gpio->cf_copro_bankmap) 1023 return -ENOMEM; 1024 if (offset < 0 || offset > gpio->chip.ngpio) 1025 return -EINVAL; 1026 bindex = offset >> 3; 1027 1028 raw_spin_lock_irqsave(&gpio->lock, flags); 1029 1030 /* Sanity check, this shouldn't happen */ 1031 if (gpio->cf_copro_bankmap[bindex] == 0xff) { 1032 rc = -EIO; 1033 goto bail; 1034 } 1035 gpio->cf_copro_bankmap[bindex]++; 1036 1037 /* Switch command source */ 1038 if (gpio->cf_copro_bankmap[bindex] == 1) 1039 aspeed_gpio_change_cmd_source(gpio, bank, bindex, 1040 GPIO_CMDSRC_COLDFIRE); 1041 1042 if (vreg_offset) 1043 *vreg_offset = bank->val_regs; 1044 if (dreg_offset) 1045 *dreg_offset = bank->rdata_reg; 1046 if (bit) 1047 *bit = GPIO_OFFSET(offset); 1048 bail: 1049 raw_spin_unlock_irqrestore(&gpio->lock, flags); 1050 return rc; 1051} 1052EXPORT_SYMBOL_GPL(aspeed_gpio_copro_grab_gpio); 1053 1054/** 1055 * aspeed_gpio_copro_release_gpio - Unmark a GPIO used by the coprocessor. 1056 * @desc: The GPIO to be marked 1057 */ 1058int aspeed_gpio_copro_release_gpio(struct gpio_desc *desc) 1059{ 1060 struct gpio_chip *chip = gpiod_to_chip(desc); 1061 struct aspeed_gpio *gpio = gpiochip_get_data(chip); 1062 int rc = 0, bindex, offset = gpio_chip_hwgpio(desc); 1063 const struct aspeed_gpio_bank *bank = to_bank(offset); 1064 unsigned long flags; 1065 1066 if (!gpio->cf_copro_bankmap) 1067 return -ENXIO; 1068 1069 if (offset < 0 || offset > gpio->chip.ngpio) 1070 return -EINVAL; 1071 bindex = offset >> 3; 1072 1073 raw_spin_lock_irqsave(&gpio->lock, flags); 1074 1075 /* Sanity check, this shouldn't happen */ 1076 if (gpio->cf_copro_bankmap[bindex] == 0) { 1077 rc = -EIO; 1078 goto bail; 1079 } 1080 gpio->cf_copro_bankmap[bindex]--; 1081 1082 /* Switch command source */ 1083 if (gpio->cf_copro_bankmap[bindex] == 0) 1084 aspeed_gpio_change_cmd_source(gpio, bank, bindex, 1085 GPIO_CMDSRC_ARM); 1086 bail: 1087 raw_spin_unlock_irqrestore(&gpio->lock, flags); 1088 return rc; 1089} 1090EXPORT_SYMBOL_GPL(aspeed_gpio_copro_release_gpio); 1091 1092static void aspeed_gpio_irq_print_chip(struct irq_data *d, struct seq_file *p) 1093{ 1094 const struct aspeed_gpio_bank *bank; 1095 struct aspeed_gpio *gpio; 1096 u32 bit; 1097 int rc, offset; 1098 1099 rc = irqd_to_aspeed_gpio_data(d, &gpio, &bank, &bit, &offset); 1100 if (rc) 1101 return; 1102 1103 seq_printf(p, dev_name(gpio->dev)); 1104} 1105 1106static const struct irq_chip aspeed_gpio_irq_chip = { 1107 .irq_ack = aspeed_gpio_irq_ack, 1108 .irq_mask = aspeed_gpio_irq_mask, 1109 .irq_unmask = aspeed_gpio_irq_unmask, 1110 .irq_set_type = aspeed_gpio_set_type, 1111 .irq_print_chip = aspeed_gpio_irq_print_chip, 1112 .flags = IRQCHIP_IMMUTABLE, 1113 GPIOCHIP_IRQ_RESOURCE_HELPERS, 1114}; 1115 1116/* 1117 * Any banks not specified in a struct aspeed_bank_props array are assumed to 1118 * have the properties: 1119 * 1120 * { .input = 0xffffffff, .output = 0xffffffff } 1121 */ 1122 1123static const struct aspeed_bank_props ast2400_bank_props[] = { 1124 /* input output */ 1125 { 5, 0xffffffff, 0x0000ffff }, /* U/V/W/X */ 1126 { 6, 0x0000000f, 0x0fffff0f }, /* Y/Z/AA/AB, two 4-GPIO holes */ 1127 { }, 1128}; 1129 1130static const struct aspeed_gpio_config ast2400_config = 1131 /* 220 for simplicity, really 216 with two 4-GPIO holes, four at end */ 1132 { .nr_gpios = 220, .props = ast2400_bank_props, }; 1133 1134static const struct aspeed_bank_props ast2500_bank_props[] = { 1135 /* input output */ 1136 { 5, 0xffffffff, 0x0000ffff }, /* U/V/W/X */ 1137 { 6, 0x0fffffff, 0x0fffffff }, /* Y/Z/AA/AB, 4-GPIO hole */ 1138 { 7, 0x000000ff, 0x000000ff }, /* AC */ 1139 { }, 1140}; 1141 1142static const struct aspeed_gpio_config ast2500_config = 1143 /* 232 for simplicity, actual number is 228 (4-GPIO hole in GPIOAB) */ 1144 { .nr_gpios = 232, .props = ast2500_bank_props, }; 1145 1146static const struct aspeed_bank_props ast2600_bank_props[] = { 1147 /* input output */ 1148 {4, 0xffffffff, 0x00ffffff}, /* Q/R/S/T */ 1149 {5, 0xffffffff, 0xffffff00}, /* U/V/W/X */ 1150 {6, 0x0000ffff, 0x0000ffff}, /* Y/Z */ 1151 { }, 1152}; 1153 1154static const struct aspeed_gpio_config ast2600_config = 1155 /* 1156 * ast2600 has two controllers one with 208 GPIOs and one with 36 GPIOs. 1157 * We expect ngpio being set in the device tree and this is a fallback 1158 * option. 1159 */ 1160 { .nr_gpios = 208, .props = ast2600_bank_props, }; 1161 1162static const struct of_device_id aspeed_gpio_of_table[] = { 1163 { .compatible = "aspeed,ast2400-gpio", .data = &ast2400_config, }, 1164 { .compatible = "aspeed,ast2500-gpio", .data = &ast2500_config, }, 1165 { .compatible = "aspeed,ast2600-gpio", .data = &ast2600_config, }, 1166 {} 1167}; 1168MODULE_DEVICE_TABLE(of, aspeed_gpio_of_table); 1169 1170static int __init aspeed_gpio_probe(struct platform_device *pdev) 1171{ 1172 const struct of_device_id *gpio_id; 1173 struct gpio_irq_chip *girq; 1174 struct aspeed_gpio *gpio; 1175 int rc, irq, i, banks, err; 1176 u32 ngpio; 1177 1178 gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL); 1179 if (!gpio) 1180 return -ENOMEM; 1181 1182 gpio->base = devm_platform_ioremap_resource(pdev, 0); 1183 if (IS_ERR(gpio->base)) 1184 return PTR_ERR(gpio->base); 1185 1186 gpio->dev = &pdev->dev; 1187 1188 raw_spin_lock_init(&gpio->lock); 1189 1190 gpio_id = of_match_node(aspeed_gpio_of_table, pdev->dev.of_node); 1191 if (!gpio_id) 1192 return -EINVAL; 1193 1194 gpio->clk = of_clk_get(pdev->dev.of_node, 0); 1195 if (IS_ERR(gpio->clk)) { 1196 dev_warn(&pdev->dev, 1197 "Failed to get clock from devicetree, debouncing disabled\n"); 1198 gpio->clk = NULL; 1199 } 1200 1201 gpio->config = gpio_id->data; 1202 1203 gpio->chip.parent = &pdev->dev; 1204 err = of_property_read_u32(pdev->dev.of_node, "ngpios", &ngpio); 1205 gpio->chip.ngpio = (u16) ngpio; 1206 if (err) 1207 gpio->chip.ngpio = gpio->config->nr_gpios; 1208 gpio->chip.direction_input = aspeed_gpio_dir_in; 1209 gpio->chip.direction_output = aspeed_gpio_dir_out; 1210 gpio->chip.get_direction = aspeed_gpio_get_direction; 1211 gpio->chip.request = aspeed_gpio_request; 1212 gpio->chip.free = aspeed_gpio_free; 1213 gpio->chip.get = aspeed_gpio_get; 1214 gpio->chip.set = aspeed_gpio_set; 1215 gpio->chip.set_config = aspeed_gpio_set_config; 1216 gpio->chip.label = dev_name(&pdev->dev); 1217 gpio->chip.base = -1; 1218 1219 /* Allocate a cache of the output registers */ 1220 banks = DIV_ROUND_UP(gpio->chip.ngpio, 32); 1221 gpio->dcache = devm_kcalloc(&pdev->dev, 1222 banks, sizeof(u32), GFP_KERNEL); 1223 if (!gpio->dcache) 1224 return -ENOMEM; 1225 1226 /* 1227 * Populate it with initial values read from the HW and switch 1228 * all command sources to the ARM by default 1229 */ 1230 for (i = 0; i < banks; i++) { 1231 const struct aspeed_gpio_bank *bank = &aspeed_gpio_banks[i]; 1232 void __iomem *addr = bank_reg(gpio, bank, reg_rdata); 1233 gpio->dcache[i] = ioread32(addr); 1234 aspeed_gpio_change_cmd_source(gpio, bank, 0, GPIO_CMDSRC_ARM); 1235 aspeed_gpio_change_cmd_source(gpio, bank, 1, GPIO_CMDSRC_ARM); 1236 aspeed_gpio_change_cmd_source(gpio, bank, 2, GPIO_CMDSRC_ARM); 1237 aspeed_gpio_change_cmd_source(gpio, bank, 3, GPIO_CMDSRC_ARM); 1238 } 1239 1240 /* Set up an irqchip */ 1241 irq = platform_get_irq(pdev, 0); 1242 if (irq < 0) 1243 return irq; 1244 gpio->irq = irq; 1245 girq = &gpio->chip.irq; 1246 gpio_irq_chip_set_chip(girq, &aspeed_gpio_irq_chip); 1247 1248 girq->parent_handler = aspeed_gpio_irq_handler; 1249 girq->num_parents = 1; 1250 girq->parents = devm_kcalloc(&pdev->dev, 1, sizeof(*girq->parents), GFP_KERNEL); 1251 if (!girq->parents) 1252 return -ENOMEM; 1253 girq->parents[0] = gpio->irq; 1254 girq->default_type = IRQ_TYPE_NONE; 1255 girq->handler = handle_bad_irq; 1256 girq->init_valid_mask = aspeed_init_irq_valid_mask; 1257 1258 gpio->offset_timer = 1259 devm_kzalloc(&pdev->dev, gpio->chip.ngpio, GFP_KERNEL); 1260 if (!gpio->offset_timer) 1261 return -ENOMEM; 1262 1263 rc = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio); 1264 if (rc < 0) 1265 return rc; 1266 1267 return 0; 1268} 1269 1270static struct platform_driver aspeed_gpio_driver = { 1271 .driver = { 1272 .name = KBUILD_MODNAME, 1273 .of_match_table = aspeed_gpio_of_table, 1274 }, 1275}; 1276 1277module_platform_driver_probe(aspeed_gpio_driver, aspeed_gpio_probe); 1278 1279MODULE_DESCRIPTION("Aspeed GPIO Driver"); 1280MODULE_LICENSE("GPL"); 1281