1/* 2 * GPIO driver for LPC32xx SoC 3 * 4 * Author: Kevin Wells <kevin.wells@nxp.com> 5 * 6 * Copyright (C) 2010 NXP Semiconductors 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 */ 18 19#include <linux/kernel.h> 20#include <linux/init.h> 21#include <linux/io.h> 22#include <linux/errno.h> 23#include <linux/gpio.h> 24#include <linux/of.h> 25#include <linux/of_gpio.h> 26#include <linux/platform_device.h> 27#include <linux/module.h> 28#include <linux/platform_data/gpio-lpc32xx.h> 29 30#include <mach/hardware.h> 31#include <mach/platform.h> 32#include <mach/irqs.h> 33 34#define LPC32XX_GPIO_P3_INP_STATE _GPREG(0x000) 35#define LPC32XX_GPIO_P3_OUTP_SET _GPREG(0x004) 36#define LPC32XX_GPIO_P3_OUTP_CLR _GPREG(0x008) 37#define LPC32XX_GPIO_P3_OUTP_STATE _GPREG(0x00C) 38#define LPC32XX_GPIO_P2_DIR_SET _GPREG(0x010) 39#define LPC32XX_GPIO_P2_DIR_CLR _GPREG(0x014) 40#define LPC32XX_GPIO_P2_DIR_STATE _GPREG(0x018) 41#define LPC32XX_GPIO_P2_INP_STATE _GPREG(0x01C) 42#define LPC32XX_GPIO_P2_OUTP_SET _GPREG(0x020) 43#define LPC32XX_GPIO_P2_OUTP_CLR _GPREG(0x024) 44#define LPC32XX_GPIO_P2_MUX_SET _GPREG(0x028) 45#define LPC32XX_GPIO_P2_MUX_CLR _GPREG(0x02C) 46#define LPC32XX_GPIO_P2_MUX_STATE _GPREG(0x030) 47#define LPC32XX_GPIO_P0_INP_STATE _GPREG(0x040) 48#define LPC32XX_GPIO_P0_OUTP_SET _GPREG(0x044) 49#define LPC32XX_GPIO_P0_OUTP_CLR _GPREG(0x048) 50#define LPC32XX_GPIO_P0_OUTP_STATE _GPREG(0x04C) 51#define LPC32XX_GPIO_P0_DIR_SET _GPREG(0x050) 52#define LPC32XX_GPIO_P0_DIR_CLR _GPREG(0x054) 53#define LPC32XX_GPIO_P0_DIR_STATE _GPREG(0x058) 54#define LPC32XX_GPIO_P1_INP_STATE _GPREG(0x060) 55#define LPC32XX_GPIO_P1_OUTP_SET _GPREG(0x064) 56#define LPC32XX_GPIO_P1_OUTP_CLR _GPREG(0x068) 57#define LPC32XX_GPIO_P1_OUTP_STATE _GPREG(0x06C) 58#define LPC32XX_GPIO_P1_DIR_SET _GPREG(0x070) 59#define LPC32XX_GPIO_P1_DIR_CLR _GPREG(0x074) 60#define LPC32XX_GPIO_P1_DIR_STATE _GPREG(0x078) 61 62#define GPIO012_PIN_TO_BIT(x) (1 << (x)) 63#define GPIO3_PIN_TO_BIT(x) (1 << ((x) + 25)) 64#define GPO3_PIN_TO_BIT(x) (1 << (x)) 65#define GPIO012_PIN_IN_SEL(x, y) (((x) >> (y)) & 1) 66#define GPIO3_PIN_IN_SHIFT(x) ((x) == 5 ? 24 : 10 + (x)) 67#define GPIO3_PIN_IN_SEL(x, y) (((x) >> GPIO3_PIN_IN_SHIFT(y)) & 1) 68#define GPIO3_PIN5_IN_SEL(x) (((x) >> 24) & 1) 69#define GPI3_PIN_IN_SEL(x, y) (((x) >> (y)) & 1) 70#define GPO3_PIN_IN_SEL(x, y) (((x) >> (y)) & 1) 71 72struct gpio_regs { 73 void __iomem *inp_state; 74 void __iomem *outp_state; 75 void __iomem *outp_set; 76 void __iomem *outp_clr; 77 void __iomem *dir_set; 78 void __iomem *dir_clr; 79}; 80 81/* 82 * GPIO names 83 */ 84static const char *gpio_p0_names[LPC32XX_GPIO_P0_MAX] = { 85 "p0.0", "p0.1", "p0.2", "p0.3", 86 "p0.4", "p0.5", "p0.6", "p0.7" 87}; 88 89static const char *gpio_p1_names[LPC32XX_GPIO_P1_MAX] = { 90 "p1.0", "p1.1", "p1.2", "p1.3", 91 "p1.4", "p1.5", "p1.6", "p1.7", 92 "p1.8", "p1.9", "p1.10", "p1.11", 93 "p1.12", "p1.13", "p1.14", "p1.15", 94 "p1.16", "p1.17", "p1.18", "p1.19", 95 "p1.20", "p1.21", "p1.22", "p1.23", 96}; 97 98static const char *gpio_p2_names[LPC32XX_GPIO_P2_MAX] = { 99 "p2.0", "p2.1", "p2.2", "p2.3", 100 "p2.4", "p2.5", "p2.6", "p2.7", 101 "p2.8", "p2.9", "p2.10", "p2.11", 102 "p2.12" 103}; 104 105static const char *gpio_p3_names[LPC32XX_GPIO_P3_MAX] = { 106 "gpio00", "gpio01", "gpio02", "gpio03", 107 "gpio04", "gpio05" 108}; 109 110static const char *gpi_p3_names[LPC32XX_GPI_P3_MAX] = { 111 "gpi00", "gpi01", "gpi02", "gpi03", 112 "gpi04", "gpi05", "gpi06", "gpi07", 113 "gpi08", "gpi09", NULL, NULL, 114 NULL, NULL, NULL, "gpi15", 115 "gpi16", "gpi17", "gpi18", "gpi19", 116 "gpi20", "gpi21", "gpi22", "gpi23", 117 "gpi24", "gpi25", "gpi26", "gpi27", 118 "gpi28" 119}; 120 121static const char *gpo_p3_names[LPC32XX_GPO_P3_MAX] = { 122 "gpo00", "gpo01", "gpo02", "gpo03", 123 "gpo04", "gpo05", "gpo06", "gpo07", 124 "gpo08", "gpo09", "gpo10", "gpo11", 125 "gpo12", "gpo13", "gpo14", "gpo15", 126 "gpo16", "gpo17", "gpo18", "gpo19", 127 "gpo20", "gpo21", "gpo22", "gpo23" 128}; 129 130static struct gpio_regs gpio_grp_regs_p0 = { 131 .inp_state = LPC32XX_GPIO_P0_INP_STATE, 132 .outp_set = LPC32XX_GPIO_P0_OUTP_SET, 133 .outp_clr = LPC32XX_GPIO_P0_OUTP_CLR, 134 .dir_set = LPC32XX_GPIO_P0_DIR_SET, 135 .dir_clr = LPC32XX_GPIO_P0_DIR_CLR, 136}; 137 138static struct gpio_regs gpio_grp_regs_p1 = { 139 .inp_state = LPC32XX_GPIO_P1_INP_STATE, 140 .outp_set = LPC32XX_GPIO_P1_OUTP_SET, 141 .outp_clr = LPC32XX_GPIO_P1_OUTP_CLR, 142 .dir_set = LPC32XX_GPIO_P1_DIR_SET, 143 .dir_clr = LPC32XX_GPIO_P1_DIR_CLR, 144}; 145 146static struct gpio_regs gpio_grp_regs_p2 = { 147 .inp_state = LPC32XX_GPIO_P2_INP_STATE, 148 .outp_set = LPC32XX_GPIO_P2_OUTP_SET, 149 .outp_clr = LPC32XX_GPIO_P2_OUTP_CLR, 150 .dir_set = LPC32XX_GPIO_P2_DIR_SET, 151 .dir_clr = LPC32XX_GPIO_P2_DIR_CLR, 152}; 153 154static struct gpio_regs gpio_grp_regs_p3 = { 155 .inp_state = LPC32XX_GPIO_P3_INP_STATE, 156 .outp_state = LPC32XX_GPIO_P3_OUTP_STATE, 157 .outp_set = LPC32XX_GPIO_P3_OUTP_SET, 158 .outp_clr = LPC32XX_GPIO_P3_OUTP_CLR, 159 .dir_set = LPC32XX_GPIO_P2_DIR_SET, 160 .dir_clr = LPC32XX_GPIO_P2_DIR_CLR, 161}; 162 163struct lpc32xx_gpio_chip { 164 struct gpio_chip chip; 165 struct gpio_regs *gpio_grp; 166}; 167 168static inline struct lpc32xx_gpio_chip *to_lpc32xx_gpio( 169 struct gpio_chip *gpc) 170{ 171 return container_of(gpc, struct lpc32xx_gpio_chip, chip); 172} 173 174static void __set_gpio_dir_p012(struct lpc32xx_gpio_chip *group, 175 unsigned pin, int input) 176{ 177 if (input) 178 __raw_writel(GPIO012_PIN_TO_BIT(pin), 179 group->gpio_grp->dir_clr); 180 else 181 __raw_writel(GPIO012_PIN_TO_BIT(pin), 182 group->gpio_grp->dir_set); 183} 184 185static void __set_gpio_dir_p3(struct lpc32xx_gpio_chip *group, 186 unsigned pin, int input) 187{ 188 u32 u = GPIO3_PIN_TO_BIT(pin); 189 190 if (input) 191 __raw_writel(u, group->gpio_grp->dir_clr); 192 else 193 __raw_writel(u, group->gpio_grp->dir_set); 194} 195 196static void __set_gpio_level_p012(struct lpc32xx_gpio_chip *group, 197 unsigned pin, int high) 198{ 199 if (high) 200 __raw_writel(GPIO012_PIN_TO_BIT(pin), 201 group->gpio_grp->outp_set); 202 else 203 __raw_writel(GPIO012_PIN_TO_BIT(pin), 204 group->gpio_grp->outp_clr); 205} 206 207static void __set_gpio_level_p3(struct lpc32xx_gpio_chip *group, 208 unsigned pin, int high) 209{ 210 u32 u = GPIO3_PIN_TO_BIT(pin); 211 212 if (high) 213 __raw_writel(u, group->gpio_grp->outp_set); 214 else 215 __raw_writel(u, group->gpio_grp->outp_clr); 216} 217 218static void __set_gpo_level_p3(struct lpc32xx_gpio_chip *group, 219 unsigned pin, int high) 220{ 221 if (high) 222 __raw_writel(GPO3_PIN_TO_BIT(pin), group->gpio_grp->outp_set); 223 else 224 __raw_writel(GPO3_PIN_TO_BIT(pin), group->gpio_grp->outp_clr); 225} 226 227static int __get_gpio_state_p012(struct lpc32xx_gpio_chip *group, 228 unsigned pin) 229{ 230 return GPIO012_PIN_IN_SEL(__raw_readl(group->gpio_grp->inp_state), 231 pin); 232} 233 234static int __get_gpio_state_p3(struct lpc32xx_gpio_chip *group, 235 unsigned pin) 236{ 237 int state = __raw_readl(group->gpio_grp->inp_state); 238 239 /* 240 * P3 GPIO pin input mapping is not contiguous, GPIOP3-0..4 is mapped 241 * to bits 10..14, while GPIOP3-5 is mapped to bit 24. 242 */ 243 return GPIO3_PIN_IN_SEL(state, pin); 244} 245 246static int __get_gpi_state_p3(struct lpc32xx_gpio_chip *group, 247 unsigned pin) 248{ 249 return GPI3_PIN_IN_SEL(__raw_readl(group->gpio_grp->inp_state), pin); 250} 251 252static int __get_gpo_state_p3(struct lpc32xx_gpio_chip *group, 253 unsigned pin) 254{ 255 return GPO3_PIN_IN_SEL(__raw_readl(group->gpio_grp->outp_state), pin); 256} 257 258/* 259 * GPIO primitives. 260 */ 261static int lpc32xx_gpio_dir_input_p012(struct gpio_chip *chip, 262 unsigned pin) 263{ 264 struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip); 265 266 __set_gpio_dir_p012(group, pin, 1); 267 268 return 0; 269} 270 271static int lpc32xx_gpio_dir_input_p3(struct gpio_chip *chip, 272 unsigned pin) 273{ 274 struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip); 275 276 __set_gpio_dir_p3(group, pin, 1); 277 278 return 0; 279} 280 281static int lpc32xx_gpio_dir_in_always(struct gpio_chip *chip, 282 unsigned pin) 283{ 284 return 0; 285} 286 287static int lpc32xx_gpio_get_value_p012(struct gpio_chip *chip, unsigned pin) 288{ 289 struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip); 290 291 return __get_gpio_state_p012(group, pin); 292} 293 294static int lpc32xx_gpio_get_value_p3(struct gpio_chip *chip, unsigned pin) 295{ 296 struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip); 297 298 return __get_gpio_state_p3(group, pin); 299} 300 301static int lpc32xx_gpi_get_value(struct gpio_chip *chip, unsigned pin) 302{ 303 struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip); 304 305 return __get_gpi_state_p3(group, pin); 306} 307 308static int lpc32xx_gpio_dir_output_p012(struct gpio_chip *chip, unsigned pin, 309 int value) 310{ 311 struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip); 312 313 __set_gpio_level_p012(group, pin, value); 314 __set_gpio_dir_p012(group, pin, 0); 315 316 return 0; 317} 318 319static int lpc32xx_gpio_dir_output_p3(struct gpio_chip *chip, unsigned pin, 320 int value) 321{ 322 struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip); 323 324 __set_gpio_level_p3(group, pin, value); 325 __set_gpio_dir_p3(group, pin, 0); 326 327 return 0; 328} 329 330static int lpc32xx_gpio_dir_out_always(struct gpio_chip *chip, unsigned pin, 331 int value) 332{ 333 struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip); 334 335 __set_gpo_level_p3(group, pin, value); 336 return 0; 337} 338 339static void lpc32xx_gpio_set_value_p012(struct gpio_chip *chip, unsigned pin, 340 int value) 341{ 342 struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip); 343 344 __set_gpio_level_p012(group, pin, value); 345} 346 347static void lpc32xx_gpio_set_value_p3(struct gpio_chip *chip, unsigned pin, 348 int value) 349{ 350 struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip); 351 352 __set_gpio_level_p3(group, pin, value); 353} 354 355static void lpc32xx_gpo_set_value(struct gpio_chip *chip, unsigned pin, 356 int value) 357{ 358 struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip); 359 360 __set_gpo_level_p3(group, pin, value); 361} 362 363static int lpc32xx_gpo_get_value(struct gpio_chip *chip, unsigned pin) 364{ 365 struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip); 366 367 return __get_gpo_state_p3(group, pin); 368} 369 370static int lpc32xx_gpio_request(struct gpio_chip *chip, unsigned pin) 371{ 372 if (pin < chip->ngpio) 373 return 0; 374 375 return -EINVAL; 376} 377 378static int lpc32xx_gpio_to_irq_p01(struct gpio_chip *chip, unsigned offset) 379{ 380 return IRQ_LPC32XX_P0_P1_IRQ; 381} 382 383static const char lpc32xx_gpio_to_irq_gpio_p3_table[] = { 384 IRQ_LPC32XX_GPIO_00, 385 IRQ_LPC32XX_GPIO_01, 386 IRQ_LPC32XX_GPIO_02, 387 IRQ_LPC32XX_GPIO_03, 388 IRQ_LPC32XX_GPIO_04, 389 IRQ_LPC32XX_GPIO_05, 390}; 391 392static int lpc32xx_gpio_to_irq_gpio_p3(struct gpio_chip *chip, unsigned offset) 393{ 394 if (offset < ARRAY_SIZE(lpc32xx_gpio_to_irq_gpio_p3_table)) 395 return lpc32xx_gpio_to_irq_gpio_p3_table[offset]; 396 return -ENXIO; 397} 398 399static const char lpc32xx_gpio_to_irq_gpi_p3_table[] = { 400 IRQ_LPC32XX_GPI_00, 401 IRQ_LPC32XX_GPI_01, 402 IRQ_LPC32XX_GPI_02, 403 IRQ_LPC32XX_GPI_03, 404 IRQ_LPC32XX_GPI_04, 405 IRQ_LPC32XX_GPI_05, 406 IRQ_LPC32XX_GPI_06, 407 IRQ_LPC32XX_GPI_07, 408 IRQ_LPC32XX_GPI_08, 409 IRQ_LPC32XX_GPI_09, 410 -ENXIO, /* 10 */ 411 -ENXIO, /* 11 */ 412 -ENXIO, /* 12 */ 413 -ENXIO, /* 13 */ 414 -ENXIO, /* 14 */ 415 -ENXIO, /* 15 */ 416 -ENXIO, /* 16 */ 417 -ENXIO, /* 17 */ 418 -ENXIO, /* 18 */ 419 IRQ_LPC32XX_GPI_19, 420 -ENXIO, /* 20 */ 421 -ENXIO, /* 21 */ 422 -ENXIO, /* 22 */ 423 -ENXIO, /* 23 */ 424 -ENXIO, /* 24 */ 425 -ENXIO, /* 25 */ 426 -ENXIO, /* 26 */ 427 -ENXIO, /* 27 */ 428 IRQ_LPC32XX_GPI_28, 429}; 430 431static int lpc32xx_gpio_to_irq_gpi_p3(struct gpio_chip *chip, unsigned offset) 432{ 433 if (offset < ARRAY_SIZE(lpc32xx_gpio_to_irq_gpi_p3_table)) 434 return lpc32xx_gpio_to_irq_gpi_p3_table[offset]; 435 return -ENXIO; 436} 437 438static struct lpc32xx_gpio_chip lpc32xx_gpiochip[] = { 439 { 440 .chip = { 441 .label = "gpio_p0", 442 .direction_input = lpc32xx_gpio_dir_input_p012, 443 .get = lpc32xx_gpio_get_value_p012, 444 .direction_output = lpc32xx_gpio_dir_output_p012, 445 .set = lpc32xx_gpio_set_value_p012, 446 .request = lpc32xx_gpio_request, 447 .to_irq = lpc32xx_gpio_to_irq_p01, 448 .base = LPC32XX_GPIO_P0_GRP, 449 .ngpio = LPC32XX_GPIO_P0_MAX, 450 .names = gpio_p0_names, 451 .can_sleep = false, 452 }, 453 .gpio_grp = &gpio_grp_regs_p0, 454 }, 455 { 456 .chip = { 457 .label = "gpio_p1", 458 .direction_input = lpc32xx_gpio_dir_input_p012, 459 .get = lpc32xx_gpio_get_value_p012, 460 .direction_output = lpc32xx_gpio_dir_output_p012, 461 .set = lpc32xx_gpio_set_value_p012, 462 .request = lpc32xx_gpio_request, 463 .to_irq = lpc32xx_gpio_to_irq_p01, 464 .base = LPC32XX_GPIO_P1_GRP, 465 .ngpio = LPC32XX_GPIO_P1_MAX, 466 .names = gpio_p1_names, 467 .can_sleep = false, 468 }, 469 .gpio_grp = &gpio_grp_regs_p1, 470 }, 471 { 472 .chip = { 473 .label = "gpio_p2", 474 .direction_input = lpc32xx_gpio_dir_input_p012, 475 .get = lpc32xx_gpio_get_value_p012, 476 .direction_output = lpc32xx_gpio_dir_output_p012, 477 .set = lpc32xx_gpio_set_value_p012, 478 .request = lpc32xx_gpio_request, 479 .base = LPC32XX_GPIO_P2_GRP, 480 .ngpio = LPC32XX_GPIO_P2_MAX, 481 .names = gpio_p2_names, 482 .can_sleep = false, 483 }, 484 .gpio_grp = &gpio_grp_regs_p2, 485 }, 486 { 487 .chip = { 488 .label = "gpio_p3", 489 .direction_input = lpc32xx_gpio_dir_input_p3, 490 .get = lpc32xx_gpio_get_value_p3, 491 .direction_output = lpc32xx_gpio_dir_output_p3, 492 .set = lpc32xx_gpio_set_value_p3, 493 .request = lpc32xx_gpio_request, 494 .to_irq = lpc32xx_gpio_to_irq_gpio_p3, 495 .base = LPC32XX_GPIO_P3_GRP, 496 .ngpio = LPC32XX_GPIO_P3_MAX, 497 .names = gpio_p3_names, 498 .can_sleep = false, 499 }, 500 .gpio_grp = &gpio_grp_regs_p3, 501 }, 502 { 503 .chip = { 504 .label = "gpi_p3", 505 .direction_input = lpc32xx_gpio_dir_in_always, 506 .get = lpc32xx_gpi_get_value, 507 .request = lpc32xx_gpio_request, 508 .to_irq = lpc32xx_gpio_to_irq_gpi_p3, 509 .base = LPC32XX_GPI_P3_GRP, 510 .ngpio = LPC32XX_GPI_P3_MAX, 511 .names = gpi_p3_names, 512 .can_sleep = false, 513 }, 514 .gpio_grp = &gpio_grp_regs_p3, 515 }, 516 { 517 .chip = { 518 .label = "gpo_p3", 519 .direction_output = lpc32xx_gpio_dir_out_always, 520 .set = lpc32xx_gpo_set_value, 521 .get = lpc32xx_gpo_get_value, 522 .request = lpc32xx_gpio_request, 523 .base = LPC32XX_GPO_P3_GRP, 524 .ngpio = LPC32XX_GPO_P3_MAX, 525 .names = gpo_p3_names, 526 .can_sleep = false, 527 }, 528 .gpio_grp = &gpio_grp_regs_p3, 529 }, 530}; 531 532static int lpc32xx_of_xlate(struct gpio_chip *gc, 533 const struct of_phandle_args *gpiospec, u32 *flags) 534{ 535 /* Is this the correct bank? */ 536 u32 bank = gpiospec->args[0]; 537 if ((bank >= ARRAY_SIZE(lpc32xx_gpiochip) || 538 (gc != &lpc32xx_gpiochip[bank].chip))) 539 return -EINVAL; 540 541 if (flags) 542 *flags = gpiospec->args[2]; 543 return gpiospec->args[1]; 544} 545 546static int lpc32xx_gpio_probe(struct platform_device *pdev) 547{ 548 int i; 549 550 for (i = 0; i < ARRAY_SIZE(lpc32xx_gpiochip); i++) { 551 if (pdev->dev.of_node) { 552 lpc32xx_gpiochip[i].chip.of_xlate = lpc32xx_of_xlate; 553 lpc32xx_gpiochip[i].chip.of_gpio_n_cells = 3; 554 lpc32xx_gpiochip[i].chip.of_node = pdev->dev.of_node; 555 } 556 gpiochip_add(&lpc32xx_gpiochip[i].chip); 557 } 558 559 return 0; 560} 561 562#ifdef CONFIG_OF 563static const struct of_device_id lpc32xx_gpio_of_match[] = { 564 { .compatible = "nxp,lpc3220-gpio", }, 565 { }, 566}; 567#endif 568 569static struct platform_driver lpc32xx_gpio_driver = { 570 .driver = { 571 .name = "lpc32xx-gpio", 572 .of_match_table = of_match_ptr(lpc32xx_gpio_of_match), 573 }, 574 .probe = lpc32xx_gpio_probe, 575}; 576 577module_platform_driver(lpc32xx_gpio_driver); 578