1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright (C) 2013 Bo Shen <voice.shen (at) atmel.com> 4 * 5 * Copyright (C) 2009 Jens Scharsig (js_at_ng (at) scharsoft.de) 6 * 7 * Copyright (C) 2005 HP Labs 8 */ 9 10 #include <config.h> 11 #include <common.h> 12 #include <clk.h> 13 #include <dm.h> 14 #include <asm/io.h> 15 #include <linux/sizes.h> 16 #include <asm/gpio.h> 17 #include <asm/arch/hardware.h> 18 #include <asm/arch/at91_pio.h> 19 20 #define GPIO_PER_BANK 32 21 22 static struct at91_port *at91_pio_get_port(unsigned port) 23 { 24 switch (port) { 25 case AT91_PIO_PORTA: 26 return (struct at91_port *)ATMEL_BASE_PIOA; 27 case AT91_PIO_PORTB: 28 return (struct at91_port *)ATMEL_BASE_PIOB; 29 case AT91_PIO_PORTC: 30 return (struct at91_port *)ATMEL_BASE_PIOC; 31 #if (ATMEL_PIO_PORTS > 3) 32 case AT91_PIO_PORTD: 33 return (struct at91_port *)ATMEL_BASE_PIOD; 34 #if (ATMEL_PIO_PORTS > 4) 35 case AT91_PIO_PORTE: 36 return (struct at91_port *)ATMEL_BASE_PIOE; 37 #endif 38 #endif 39 default: 40 printf("Error: at91_gpio: Fail to get PIO base!\n"); 41 return NULL; 42 } 43 } 44 45 static void at91_set_port_pullup(struct at91_port *at91_port, unsigned offset, 46 int use_pullup) 47 { 48 u32 mask; 49 50 mask = 1 << offset; 51 if (use_pullup) 52 writel(mask, &at91_port->puer); 53 else 54 writel(mask, &at91_port->pudr); 55 writel(mask, &at91_port->per); 56 } 57 58 int at91_set_pio_pullup(unsigned port, unsigned pin, int use_pullup) 59 { 60 struct at91_port *at91_port = at91_pio_get_port(port); 61 62 if (at91_port && (pin < GPIO_PER_BANK)) 63 at91_set_port_pullup(at91_port, pin, use_pullup); 64 65 return 0; 66 } 67 68 /* 69 * mux the pin to the "GPIO" peripheral role. 70 */ 71 int at91_set_pio_periph(unsigned port, unsigned pin, int use_pullup) 72 { 73 struct at91_port *at91_port = at91_pio_get_port(port); 74 u32 mask; 75 76 if (at91_port && (pin < GPIO_PER_BANK)) { 77 mask = 1 << pin; 78 writel(mask, &at91_port->idr); 79 at91_set_pio_pullup(port, pin, use_pullup); 80 writel(mask, &at91_port->per); 81 } 82 83 return 0; 84 } 85 86 /* 87 * mux the pin to the "A" internal peripheral role. 88 */ 89 int at91_set_a_periph(unsigned port, unsigned pin, int use_pullup) 90 { 91 struct at91_port *at91_port = at91_pio_get_port(port); 92 u32 mask; 93 94 if (at91_port && (pin < GPIO_PER_BANK)) { 95 mask = 1 << pin; 96 writel(mask, &at91_port->idr); 97 at91_set_pio_pullup(port, pin, use_pullup); 98 writel(mask, &at91_port->mux.pio2.asr); 99 writel(mask, &at91_port->pdr); 100 } 101 102 return 0; 103 } 104 105 /* 106 * mux the pin to the "B" internal peripheral role. 107 */ 108 int at91_set_b_periph(unsigned port, unsigned pin, int use_pullup) 109 { 110 struct at91_port *at91_port = at91_pio_get_port(port); 111 u32 mask; 112 113 if (at91_port && (pin < GPIO_PER_BANK)) { 114 mask = 1 << pin; 115 writel(mask, &at91_port->idr); 116 at91_set_pio_pullup(port, pin, use_pullup); 117 writel(mask, &at91_port->mux.pio2.bsr); 118 writel(mask, &at91_port->pdr); 119 } 120 121 return 0; 122 } 123 124 /* 125 * mux the pin to the "A" internal peripheral role. 126 */ 127 int at91_pio3_set_a_periph(unsigned port, unsigned pin, int use_pullup) 128 { 129 struct at91_port *at91_port = at91_pio_get_port(port); 130 u32 mask; 131 132 if (at91_port && (pin < GPIO_PER_BANK)) { 133 mask = 1 << pin; 134 writel(mask, &at91_port->idr); 135 at91_set_pio_pullup(port, pin, use_pullup); 136 writel(readl(&at91_port->mux.pio3.abcdsr1) & ~mask, 137 &at91_port->mux.pio3.abcdsr1); 138 writel(readl(&at91_port->mux.pio3.abcdsr2) & ~mask, 139 &at91_port->mux.pio3.abcdsr2); 140 141 writel(mask, &at91_port->pdr); 142 } 143 144 return 0; 145 } 146 147 /* 148 * mux the pin to the "B" internal peripheral role. 149 */ 150 int at91_pio3_set_b_periph(unsigned port, unsigned pin, int use_pullup) 151 { 152 struct at91_port *at91_port = at91_pio_get_port(port); 153 u32 mask; 154 155 if (at91_port && (pin < GPIO_PER_BANK)) { 156 mask = 1 << pin; 157 writel(mask, &at91_port->idr); 158 at91_set_pio_pullup(port, pin, use_pullup); 159 writel(readl(&at91_port->mux.pio3.abcdsr1) | mask, 160 &at91_port->mux.pio3.abcdsr1); 161 writel(readl(&at91_port->mux.pio3.abcdsr2) & ~mask, 162 &at91_port->mux.pio3.abcdsr2); 163 164 writel(mask, &at91_port->pdr); 165 } 166 167 return 0; 168 } 169 /* 170 * mux the pin to the "C" internal peripheral role. 171 */ 172 int at91_pio3_set_c_periph(unsigned port, unsigned pin, int use_pullup) 173 { 174 struct at91_port *at91_port = at91_pio_get_port(port); 175 u32 mask; 176 177 if (at91_port && (pin < GPIO_PER_BANK)) { 178 mask = 1 << pin; 179 writel(mask, &at91_port->idr); 180 at91_set_pio_pullup(port, pin, use_pullup); 181 writel(readl(&at91_port->mux.pio3.abcdsr1) & ~mask, 182 &at91_port->mux.pio3.abcdsr1); 183 writel(readl(&at91_port->mux.pio3.abcdsr2) | mask, 184 &at91_port->mux.pio3.abcdsr2); 185 writel(mask, &at91_port->pdr); 186 } 187 188 return 0; 189 } 190 191 /* 192 * mux the pin to the "D" internal peripheral role. 193 */ 194 int at91_pio3_set_d_periph(unsigned port, unsigned pin, int use_pullup) 195 { 196 struct at91_port *at91_port = at91_pio_get_port(port); 197 u32 mask; 198 199 if (at91_port && (pin < GPIO_PER_BANK)) { 200 mask = 1 << pin; 201 writel(mask, &at91_port->idr); 202 at91_set_pio_pullup(port, pin, use_pullup); 203 writel(readl(&at91_port->mux.pio3.abcdsr1) | mask, 204 &at91_port->mux.pio3.abcdsr1); 205 writel(readl(&at91_port->mux.pio3.abcdsr2) | mask, 206 &at91_port->mux.pio3.abcdsr2); 207 writel(mask, &at91_port->pdr); 208 } 209 210 return 0; 211 } 212 213 #ifdef CONFIG_DM_GPIO 214 static bool at91_get_port_output(struct at91_port *at91_port, int offset) 215 { 216 u32 mask, val; 217 218 mask = 1 << offset; 219 val = readl(&at91_port->osr); 220 return val & mask; 221 } 222 #endif 223 224 static void at91_set_port_input(struct at91_port *at91_port, int offset, 225 int use_pullup) 226 { 227 u32 mask; 228 229 mask = 1 << offset; 230 writel(mask, &at91_port->idr); 231 at91_set_port_pullup(at91_port, offset, use_pullup); 232 writel(mask, &at91_port->odr); 233 writel(mask, &at91_port->per); 234 } 235 236 /* 237 * mux the pin to the gpio controller (instead of "A" or "B" peripheral), and 238 * configure it for an input. 239 */ 240 int at91_set_pio_input(unsigned port, u32 pin, int use_pullup) 241 { 242 struct at91_port *at91_port = at91_pio_get_port(port); 243 244 if (at91_port && (pin < GPIO_PER_BANK)) 245 at91_set_port_input(at91_port, pin, use_pullup); 246 247 return 0; 248 } 249 250 static void at91_set_port_output(struct at91_port *at91_port, int offset, 251 int value) 252 { 253 u32 mask; 254 255 mask = 1 << offset; 256 writel(mask, &at91_port->idr); 257 writel(mask, &at91_port->pudr); 258 if (value) 259 writel(mask, &at91_port->sodr); 260 else 261 writel(mask, &at91_port->codr); 262 writel(mask, &at91_port->oer); 263 writel(mask, &at91_port->per); 264 } 265 266 /* 267 * mux the pin to the gpio controller (instead of "A" or "B" peripheral), 268 * and configure it for an output. 269 */ 270 int at91_set_pio_output(unsigned port, u32 pin, int value) 271 { 272 struct at91_port *at91_port = at91_pio_get_port(port); 273 274 if (at91_port && (pin < GPIO_PER_BANK)) 275 at91_set_port_output(at91_port, pin, value); 276 277 return 0; 278 } 279 280 /* 281 * enable/disable the glitch filter. mostly used with IRQ handling. 282 */ 283 int at91_set_pio_deglitch(unsigned port, unsigned pin, int is_on) 284 { 285 struct at91_port *at91_port = at91_pio_get_port(port); 286 u32 mask; 287 288 if (at91_port && (pin < GPIO_PER_BANK)) { 289 mask = 1 << pin; 290 if (is_on) 291 writel(mask, &at91_port->ifer); 292 else 293 writel(mask, &at91_port->ifdr); 294 } 295 296 return 0; 297 } 298 299 /* 300 * enable/disable the glitch filter. mostly used with IRQ handling. 301 */ 302 int at91_pio3_set_pio_deglitch(unsigned port, unsigned pin, int is_on) 303 { 304 struct at91_port *at91_port = at91_pio_get_port(port); 305 u32 mask; 306 307 if (at91_port && (pin < GPIO_PER_BANK)) { 308 mask = 1 << pin; 309 if (is_on) { 310 writel(mask, &at91_port->mux.pio3.ifscdr); 311 writel(mask, &at91_port->ifer); 312 } else { 313 writel(mask, &at91_port->ifdr); 314 } 315 } 316 317 return 0; 318 } 319 320 /* 321 * enable/disable the debounce filter. 322 */ 323 int at91_pio3_set_pio_debounce(unsigned port, unsigned pin, int is_on, int div) 324 { 325 struct at91_port *at91_port = at91_pio_get_port(port); 326 u32 mask; 327 328 if (at91_port && (pin < GPIO_PER_BANK)) { 329 mask = 1 << pin; 330 if (is_on) { 331 writel(mask, &at91_port->mux.pio3.ifscer); 332 writel(div & PIO_SCDR_DIV, &at91_port->mux.pio3.scdr); 333 writel(mask, &at91_port->ifer); 334 } else { 335 writel(mask, &at91_port->ifdr); 336 } 337 } 338 339 return 0; 340 } 341 342 /* 343 * enable/disable the pull-down. 344 * If pull-up already enabled while calling the function, we disable it. 345 */ 346 int at91_pio3_set_pio_pulldown(unsigned port, unsigned pin, int is_on) 347 { 348 struct at91_port *at91_port = at91_pio_get_port(port); 349 u32 mask; 350 351 if (at91_port && (pin < GPIO_PER_BANK)) { 352 mask = 1 << pin; 353 if (is_on) { 354 at91_set_pio_pullup(port, pin, 0); 355 writel(mask, &at91_port->mux.pio3.ppder); 356 } else 357 writel(mask, &at91_port->mux.pio3.ppddr); 358 } 359 360 return 0; 361 } 362 363 int at91_pio3_set_pio_pullup(unsigned port, unsigned pin, int use_pullup) 364 { 365 struct at91_port *at91_port = at91_pio_get_port(port); 366 367 if (use_pullup) 368 at91_pio3_set_pio_pulldown(port, pin, 0); 369 370 if (at91_port && (pin < GPIO_PER_BANK)) 371 at91_set_port_pullup(at91_port, pin, use_pullup); 372 373 return 0; 374 } 375 376 /* 377 * disable Schmitt trigger 378 */ 379 int at91_pio3_set_pio_disable_schmitt_trig(unsigned port, unsigned pin) 380 { 381 struct at91_port *at91_port = at91_pio_get_port(port); 382 u32 mask; 383 384 if (at91_port && (pin < GPIO_PER_BANK)) { 385 mask = 1 << pin; 386 writel(readl(&at91_port->schmitt) | mask, 387 &at91_port->schmitt); 388 } 389 390 return 0; 391 } 392 393 /* 394 * enable/disable the multi-driver. This is only valid for output and 395 * allows the output pin to run as an open collector output. 396 */ 397 int at91_set_pio_multi_drive(unsigned port, unsigned pin, int is_on) 398 { 399 struct at91_port *at91_port = at91_pio_get_port(port); 400 u32 mask; 401 402 if (at91_port && (pin < GPIO_PER_BANK)) { 403 mask = 1 << pin; 404 if (is_on) 405 writel(mask, &at91_port->mder); 406 else 407 writel(mask, &at91_port->mddr); 408 } 409 410 return 0; 411 } 412 413 static void at91_set_port_value(struct at91_port *at91_port, int offset, 414 int value) 415 { 416 u32 mask; 417 418 mask = 1 << offset; 419 if (value) 420 writel(mask, &at91_port->sodr); 421 else 422 writel(mask, &at91_port->codr); 423 } 424 425 /* 426 * assuming the pin is muxed as a gpio output, set its value. 427 */ 428 int at91_set_pio_value(unsigned port, unsigned pin, int value) 429 { 430 struct at91_port *at91_port = at91_pio_get_port(port); 431 432 if (at91_port && (pin < GPIO_PER_BANK)) 433 at91_set_port_value(at91_port, pin, value); 434 435 return 0; 436 } 437 438 static int at91_get_port_value(struct at91_port *at91_port, int offset) 439 { 440 u32 pdsr = 0, mask; 441 442 mask = 1 << offset; 443 pdsr = readl(&at91_port->pdsr) & mask; 444 445 return pdsr != 0; 446 } 447 /* 448 * read the pin's value (works even if it's not muxed as a gpio). 449 */ 450 int at91_get_pio_value(unsigned port, unsigned pin) 451 { 452 struct at91_port *at91_port = at91_pio_get_port(port); 453 454 if (at91_port && (pin < GPIO_PER_BANK)) 455 return at91_get_port_value(at91_port, pin); 456 457 return 0; 458 } 459 460 #ifndef CONFIG_DM_GPIO 461 /* Common GPIO API */ 462 463 int gpio_request(unsigned gpio, const char *label) 464 { 465 return 0; 466 } 467 468 int gpio_free(unsigned gpio) 469 { 470 return 0; 471 } 472 473 int gpio_direction_input(unsigned gpio) 474 { 475 at91_set_pio_input(at91_gpio_to_port(gpio), 476 at91_gpio_to_pin(gpio), 0); 477 return 0; 478 } 479 480 int gpio_direction_output(unsigned gpio, int value) 481 { 482 at91_set_pio_output(at91_gpio_to_port(gpio), 483 at91_gpio_to_pin(gpio), value); 484 return 0; 485 } 486 487 int gpio_get_value(unsigned gpio) 488 { 489 return at91_get_pio_value(at91_gpio_to_port(gpio), 490 at91_gpio_to_pin(gpio)); 491 } 492 493 int gpio_set_value(unsigned gpio, int value) 494 { 495 at91_set_pio_value(at91_gpio_to_port(gpio), 496 at91_gpio_to_pin(gpio), value); 497 498 return 0; 499 } 500 #endif 501 502 #ifdef CONFIG_DM_GPIO 503 504 struct at91_port_priv { 505 struct at91_port *regs; 506 }; 507 508 /* set GPIO pin 'gpio' as an input */ 509 static int at91_gpio_direction_input(struct udevice *dev, unsigned offset) 510 { 511 struct at91_port_priv *port = dev_get_priv(dev); 512 513 at91_set_port_input(port->regs, offset, 0); 514 515 return 0; 516 } 517 518 /* set GPIO pin 'gpio' as an output, with polarity 'value' */ 519 static int at91_gpio_direction_output(struct udevice *dev, unsigned offset, 520 int value) 521 { 522 struct at91_port_priv *port = dev_get_priv(dev); 523 524 at91_set_port_output(port->regs, offset, value); 525 526 return 0; 527 } 528 529 /* read GPIO IN value of pin 'gpio' */ 530 static int at91_gpio_get_value(struct udevice *dev, unsigned offset) 531 { 532 struct at91_port_priv *port = dev_get_priv(dev); 533 534 return at91_get_port_value(port->regs, offset); 535 } 536 537 /* write GPIO OUT value to pin 'gpio' */ 538 static int at91_gpio_set_value(struct udevice *dev, unsigned offset, 539 int value) 540 { 541 struct at91_port_priv *port = dev_get_priv(dev); 542 543 at91_set_port_value(port->regs, offset, value); 544 545 return 0; 546 } 547 548 static int at91_gpio_get_function(struct udevice *dev, unsigned offset) 549 { 550 struct at91_port_priv *port = dev_get_priv(dev); 551 552 /* GPIOF_FUNC is not implemented yet */ 553 if (at91_get_port_output(port->regs, offset)) 554 return GPIOF_OUTPUT; 555 else 556 return GPIOF_INPUT; 557 } 558 559 static const struct dm_gpio_ops gpio_at91_ops = { 560 .direction_input = at91_gpio_direction_input, 561 .direction_output = at91_gpio_direction_output, 562 .get_value = at91_gpio_get_value, 563 .set_value = at91_gpio_set_value, 564 .get_function = at91_gpio_get_function, 565 }; 566 567 static int at91_gpio_probe(struct udevice *dev) 568 { 569 struct at91_port_priv *port = dev_get_priv(dev); 570 struct at91_port_platdata *plat = dev_get_platdata(dev); 571 struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev); 572 struct clk clk; 573 int ret; 574 575 ret = clk_get_by_index(dev, 0, &clk); 576 if (ret) 577 return ret; 578 579 ret = clk_enable(&clk); 580 if (ret) 581 return ret; 582 583 clk_free(&clk); 584 585 uc_priv->bank_name = plat->bank_name; 586 uc_priv->gpio_count = GPIO_PER_BANK; 587 588 #if CONFIG_IS_ENABLED(OF_CONTROL) 589 plat->base_addr = (uint32_t)devfdt_get_addr_ptr(dev); 590 #endif 591 port->regs = (struct at91_port *)plat->base_addr; 592 593 return 0; 594 } 595 596 #if CONFIG_IS_ENABLED(OF_CONTROL) 597 static const struct udevice_id at91_gpio_ids[] = { 598 { .compatible = "atmel,at91rm9200-gpio" }, 599 { } 600 }; 601 #endif 602 603 U_BOOT_DRIVER(gpio_at91) = { 604 .name = "gpio_at91", 605 .id = UCLASS_GPIO, 606 #if CONFIG_IS_ENABLED(OF_CONTROL) 607 .of_match = at91_gpio_ids, 608 .platdata_auto_alloc_size = sizeof(struct at91_port_platdata), 609 #endif 610 .ops = &gpio_at91_ops, 611 .probe = at91_gpio_probe, 612 .priv_auto_alloc_size = sizeof(struct at91_port_priv), 613 }; 614 #endif 615
