1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * GPIO driver for LPC32xx SoC 4 * 5 * Author: Kevin Wells <kevin.wells@nxp.com> 6 * 7 * Copyright (C) 2010 NXP Semiconductors 8 */ 9 10 #include <linux/kernel.h> 11 #include <linux/init.h> 12 #include <linux/io.h> 13 #include <linux/errno.h> 14 #include <linux/gpio/driver.h> 15 #include <linux/of.h> 16 #include <linux/platform_device.h> 17 #include <linux/module.h> 18 19 #define LPC32XX_GPIO_P3_INP_STATE (0x000) 20 #define LPC32XX_GPIO_P3_OUTP_SET (0x004) 21 #define LPC32XX_GPIO_P3_OUTP_CLR (0x008) 22 #define LPC32XX_GPIO_P3_OUTP_STATE (0x00C) 23 #define LPC32XX_GPIO_P2_DIR_SET (0x010) 24 #define LPC32XX_GPIO_P2_DIR_CLR (0x014) 25 #define LPC32XX_GPIO_P2_DIR_STATE (0x018) 26 #define LPC32XX_GPIO_P2_INP_STATE (0x01C) 27 #define LPC32XX_GPIO_P2_OUTP_SET (0x020) 28 #define LPC32XX_GPIO_P2_OUTP_CLR (0x024) 29 #define LPC32XX_GPIO_P2_MUX_SET (0x028) 30 #define LPC32XX_GPIO_P2_MUX_CLR (0x02C) 31 #define LPC32XX_GPIO_P2_MUX_STATE (0x030) 32 #define LPC32XX_GPIO_P0_INP_STATE (0x040) 33 #define LPC32XX_GPIO_P0_OUTP_SET (0x044) 34 #define LPC32XX_GPIO_P0_OUTP_CLR (0x048) 35 #define LPC32XX_GPIO_P0_OUTP_STATE (0x04C) 36 #define LPC32XX_GPIO_P0_DIR_SET (0x050) 37 #define LPC32XX_GPIO_P0_DIR_CLR (0x054) 38 #define LPC32XX_GPIO_P0_DIR_STATE (0x058) 39 #define LPC32XX_GPIO_P1_INP_STATE (0x060) 40 #define LPC32XX_GPIO_P1_OUTP_SET (0x064) 41 #define LPC32XX_GPIO_P1_OUTP_CLR (0x068) 42 #define LPC32XX_GPIO_P1_OUTP_STATE (0x06C) 43 #define LPC32XX_GPIO_P1_DIR_SET (0x070) 44 #define LPC32XX_GPIO_P1_DIR_CLR (0x074) 45 #define LPC32XX_GPIO_P1_DIR_STATE (0x078) 46 47 #define GPIO012_PIN_TO_BIT(x) (1 << (x)) 48 #define GPIO3_PIN_TO_BIT(x) (1 << ((x) + 25)) 49 #define GPO3_PIN_TO_BIT(x) (1 << (x)) 50 #define GPIO012_PIN_IN_SEL(x, y) (((x) >> (y)) & 1) 51 #define GPIO3_PIN_IN_SHIFT(x) ((x) == 5 ? 24 : 10 + (x)) 52 #define GPIO3_PIN_IN_SEL(x, y) (((x) >> GPIO3_PIN_IN_SHIFT(y)) & 1) 53 #define GPIO3_PIN5_IN_SEL(x) (((x) >> 24) & 1) 54 #define GPI3_PIN_IN_SEL(x, y) (((x) >> (y)) & 1) 55 #define GPO3_PIN_IN_SEL(x, y) (((x) >> (y)) & 1) 56 57 #define LPC32XX_GPIO_P0_MAX 8 58 #define LPC32XX_GPIO_P1_MAX 24 59 #define LPC32XX_GPIO_P2_MAX 13 60 #define LPC32XX_GPIO_P3_MAX 6 61 #define LPC32XX_GPI_P3_MAX 29 62 #define LPC32XX_GPO_P3_MAX 24 63 64 #define LPC32XX_GPIO_P0_GRP 0 65 #define LPC32XX_GPIO_P1_GRP (LPC32XX_GPIO_P0_GRP + LPC32XX_GPIO_P0_MAX) 66 #define LPC32XX_GPIO_P2_GRP (LPC32XX_GPIO_P1_GRP + LPC32XX_GPIO_P1_MAX) 67 #define LPC32XX_GPIO_P3_GRP (LPC32XX_GPIO_P2_GRP + LPC32XX_GPIO_P2_MAX) 68 #define LPC32XX_GPI_P3_GRP (LPC32XX_GPIO_P3_GRP + LPC32XX_GPIO_P3_MAX) 69 #define LPC32XX_GPO_P3_GRP (LPC32XX_GPI_P3_GRP + LPC32XX_GPI_P3_MAX) 70 71 struct gpio_regs { 72 unsigned long inp_state; 73 unsigned long outp_state; 74 unsigned long outp_set; 75 unsigned long outp_clr; 76 unsigned long dir_set; 77 unsigned long dir_clr; 78 }; 79 80 /* 81 * GPIO names 82 */ 83 static const char *gpio_p0_names[LPC32XX_GPIO_P0_MAX] = { 84 "p0.0", "p0.1", "p0.2", "p0.3", 85 "p0.4", "p0.5", "p0.6", "p0.7" 86 }; 87 88 static const char *gpio_p1_names[LPC32XX_GPIO_P1_MAX] = { 89 "p1.0", "p1.1", "p1.2", "p1.3", 90 "p1.4", "p1.5", "p1.6", "p1.7", 91 "p1.8", "p1.9", "p1.10", "p1.11", 92 "p1.12", "p1.13", "p1.14", "p1.15", 93 "p1.16", "p1.17", "p1.18", "p1.19", 94 "p1.20", "p1.21", "p1.22", "p1.23", 95 }; 96 97 static const char *gpio_p2_names[LPC32XX_GPIO_P2_MAX] = { 98 "p2.0", "p2.1", "p2.2", "p2.3", 99 "p2.4", "p2.5", "p2.6", "p2.7", 100 "p2.8", "p2.9", "p2.10", "p2.11", 101 "p2.12" 102 }; 103 104 static const char *gpio_p3_names[LPC32XX_GPIO_P3_MAX] = { 105 "gpio00", "gpio01", "gpio02", "gpio03", 106 "gpio04", "gpio05" 107 }; 108 109 static const char *gpi_p3_names[LPC32XX_GPI_P3_MAX] = { 110 "gpi00", "gpi01", "gpi02", "gpi03", 111 "gpi04", "gpi05", "gpi06", "gpi07", 112 "gpi08", "gpi09", NULL, NULL, 113 NULL, NULL, NULL, "gpi15", 114 "gpi16", "gpi17", "gpi18", "gpi19", 115 "gpi20", "gpi21", "gpi22", "gpi23", 116 "gpi24", "gpi25", "gpi26", "gpi27", 117 "gpi28" 118 }; 119 120 static const char *gpo_p3_names[LPC32XX_GPO_P3_MAX] = { 121 "gpo00", "gpo01", "gpo02", "gpo03", 122 "gpo04", "gpo05", "gpo06", "gpo07", 123 "gpo08", "gpo09", "gpo10", "gpo11", 124 "gpo12", "gpo13", "gpo14", "gpo15", 125 "gpo16", "gpo17", "gpo18", "gpo19", 126 "gpo20", "gpo21", "gpo22", "gpo23" 127 }; 128 129 static struct gpio_regs gpio_grp_regs_p0 = { 130 .inp_state = LPC32XX_GPIO_P0_INP_STATE, 131 .outp_set = LPC32XX_GPIO_P0_OUTP_SET, 132 .outp_clr = LPC32XX_GPIO_P0_OUTP_CLR, 133 .dir_set = LPC32XX_GPIO_P0_DIR_SET, 134 .dir_clr = LPC32XX_GPIO_P0_DIR_CLR, 135 }; 136 137 static struct gpio_regs gpio_grp_regs_p1 = { 138 .inp_state = LPC32XX_GPIO_P1_INP_STATE, 139 .outp_set = LPC32XX_GPIO_P1_OUTP_SET, 140 .outp_clr = LPC32XX_GPIO_P1_OUTP_CLR, 141 .dir_set = LPC32XX_GPIO_P1_DIR_SET, 142 .dir_clr = LPC32XX_GPIO_P1_DIR_CLR, 143 }; 144 145 static struct gpio_regs gpio_grp_regs_p2 = { 146 .inp_state = LPC32XX_GPIO_P2_INP_STATE, 147 .outp_set = LPC32XX_GPIO_P2_OUTP_SET, 148 .outp_clr = LPC32XX_GPIO_P2_OUTP_CLR, 149 .dir_set = LPC32XX_GPIO_P2_DIR_SET, 150 .dir_clr = LPC32XX_GPIO_P2_DIR_CLR, 151 }; 152 153 static struct gpio_regs gpio_grp_regs_p3 = { 154 .inp_state = LPC32XX_GPIO_P3_INP_STATE, 155 .outp_state = LPC32XX_GPIO_P3_OUTP_STATE, 156 .outp_set = LPC32XX_GPIO_P3_OUTP_SET, 157 .outp_clr = LPC32XX_GPIO_P3_OUTP_CLR, 158 .dir_set = LPC32XX_GPIO_P2_DIR_SET, 159 .dir_clr = LPC32XX_GPIO_P2_DIR_CLR, 160 }; 161 162 struct lpc32xx_gpio_chip { 163 struct gpio_chip chip; 164 struct gpio_regs *gpio_grp; 165 void __iomem *reg_base; 166 }; 167 168 static inline u32 gpreg_read(struct lpc32xx_gpio_chip *group, unsigned long offset) 169 { 170 return __raw_readl(group->reg_base + offset); 171 } 172 173 static inline void gpreg_write(struct lpc32xx_gpio_chip *group, u32 val, unsigned long offset) 174 { 175 __raw_writel(val, group->reg_base + offset); 176 } 177 178 static void __set_gpio_dir_p012(struct lpc32xx_gpio_chip *group, 179 unsigned pin, int input) 180 { 181 if (input) 182 gpreg_write(group, GPIO012_PIN_TO_BIT(pin), 183 group->gpio_grp->dir_clr); 184 else 185 gpreg_write(group, GPIO012_PIN_TO_BIT(pin), 186 group->gpio_grp->dir_set); 187 } 188 189 static void __set_gpio_dir_p3(struct lpc32xx_gpio_chip *group, 190 unsigned pin, int input) 191 { 192 u32 u = GPIO3_PIN_TO_BIT(pin); 193 194 if (input) 195 gpreg_write(group, u, group->gpio_grp->dir_clr); 196 else 197 gpreg_write(group, u, group->gpio_grp->dir_set); 198 } 199 200 static void __set_gpio_level_p012(struct lpc32xx_gpio_chip *group, 201 unsigned pin, int high) 202 { 203 if (high) 204 gpreg_write(group, GPIO012_PIN_TO_BIT(pin), 205 group->gpio_grp->outp_set); 206 else 207 gpreg_write(group, GPIO012_PIN_TO_BIT(pin), 208 group->gpio_grp->outp_clr); 209 } 210 211 static void __set_gpio_level_p3(struct lpc32xx_gpio_chip *group, 212 unsigned pin, int high) 213 { 214 u32 u = GPIO3_PIN_TO_BIT(pin); 215 216 if (high) 217 gpreg_write(group, u, group->gpio_grp->outp_set); 218 else 219 gpreg_write(group, u, group->gpio_grp->outp_clr); 220 } 221 222 static void __set_gpo_level_p3(struct lpc32xx_gpio_chip *group, 223 unsigned pin, int high) 224 { 225 if (high) 226 gpreg_write(group, GPO3_PIN_TO_BIT(pin), group->gpio_grp->outp_set); 227 else 228 gpreg_write(group, GPO3_PIN_TO_BIT(pin), group->gpio_grp->outp_clr); 229 } 230 231 static int __get_gpio_state_p012(struct lpc32xx_gpio_chip *group, 232 unsigned pin) 233 { 234 return GPIO012_PIN_IN_SEL(gpreg_read(group, group->gpio_grp->inp_state), 235 pin); 236 } 237 238 static int __get_gpio_state_p3(struct lpc32xx_gpio_chip *group, 239 unsigned pin) 240 { 241 int state = gpreg_read(group, group->gpio_grp->inp_state); 242 243 /* 244 * P3 GPIO pin input mapping is not contiguous, GPIOP3-0..4 is mapped 245 * to bits 10..14, while GPIOP3-5 is mapped to bit 24. 246 */ 247 return GPIO3_PIN_IN_SEL(state, pin); 248 } 249 250 static int __get_gpi_state_p3(struct lpc32xx_gpio_chip *group, 251 unsigned pin) 252 { 253 return GPI3_PIN_IN_SEL(gpreg_read(group, group->gpio_grp->inp_state), pin); 254 } 255 256 static int __get_gpo_state_p3(struct lpc32xx_gpio_chip *group, 257 unsigned pin) 258 { 259 return GPO3_PIN_IN_SEL(gpreg_read(group, group->gpio_grp->outp_state), pin); 260 } 261 262 /* 263 * GPIO primitives. 264 */ 265 static int lpc32xx_gpio_dir_input_p012(struct gpio_chip *chip, 266 unsigned pin) 267 { 268 struct lpc32xx_gpio_chip *group = gpiochip_get_data(chip); 269 270 __set_gpio_dir_p012(group, pin, 1); 271 272 return 0; 273 } 274 275 static int lpc32xx_gpio_dir_input_p3(struct gpio_chip *chip, 276 unsigned pin) 277 { 278 struct lpc32xx_gpio_chip *group = gpiochip_get_data(chip); 279 280 __set_gpio_dir_p3(group, pin, 1); 281 282 return 0; 283 } 284 285 static int lpc32xx_gpio_dir_in_always(struct gpio_chip *chip, 286 unsigned pin) 287 { 288 return 0; 289 } 290 291 static int lpc32xx_gpio_get_value_p012(struct gpio_chip *chip, unsigned pin) 292 { 293 struct lpc32xx_gpio_chip *group = gpiochip_get_data(chip); 294 295 return !!__get_gpio_state_p012(group, pin); 296 } 297 298 static int lpc32xx_gpio_get_value_p3(struct gpio_chip *chip, unsigned pin) 299 { 300 struct lpc32xx_gpio_chip *group = gpiochip_get_data(chip); 301 302 return !!__get_gpio_state_p3(group, pin); 303 } 304 305 static int lpc32xx_gpi_get_value(struct gpio_chip *chip, unsigned pin) 306 { 307 struct lpc32xx_gpio_chip *group = gpiochip_get_data(chip); 308 309 return !!__get_gpi_state_p3(group, pin); 310 } 311 312 static int lpc32xx_gpio_dir_output_p012(struct gpio_chip *chip, unsigned pin, 313 int value) 314 { 315 struct lpc32xx_gpio_chip *group = gpiochip_get_data(chip); 316 317 __set_gpio_level_p012(group, pin, value); 318 __set_gpio_dir_p012(group, pin, 0); 319 320 return 0; 321 } 322 323 static int lpc32xx_gpio_dir_output_p3(struct gpio_chip *chip, unsigned pin, 324 int value) 325 { 326 struct lpc32xx_gpio_chip *group = gpiochip_get_data(chip); 327 328 __set_gpio_level_p3(group, pin, value); 329 __set_gpio_dir_p3(group, pin, 0); 330 331 return 0; 332 } 333 334 static int lpc32xx_gpio_dir_out_always(struct gpio_chip *chip, unsigned pin, 335 int value) 336 { 337 struct lpc32xx_gpio_chip *group = gpiochip_get_data(chip); 338 339 __set_gpo_level_p3(group, pin, value); 340 return 0; 341 } 342 343 static void lpc32xx_gpio_set_value_p012(struct gpio_chip *chip, unsigned pin, 344 int value) 345 { 346 struct lpc32xx_gpio_chip *group = gpiochip_get_data(chip); 347 348 __set_gpio_level_p012(group, pin, value); 349 } 350 351 static void lpc32xx_gpio_set_value_p3(struct gpio_chip *chip, unsigned pin, 352 int value) 353 { 354 struct lpc32xx_gpio_chip *group = gpiochip_get_data(chip); 355 356 __set_gpio_level_p3(group, pin, value); 357 } 358 359 static void lpc32xx_gpo_set_value(struct gpio_chip *chip, unsigned pin, 360 int value) 361 { 362 struct lpc32xx_gpio_chip *group = gpiochip_get_data(chip); 363 364 __set_gpo_level_p3(group, pin, value); 365 } 366 367 static int lpc32xx_gpo_get_value(struct gpio_chip *chip, unsigned pin) 368 { 369 struct lpc32xx_gpio_chip *group = gpiochip_get_data(chip); 370 371 return !!__get_gpo_state_p3(group, pin); 372 } 373 374 static int lpc32xx_gpio_request(struct gpio_chip *chip, unsigned pin) 375 { 376 if (pin < chip->ngpio) 377 return 0; 378 379 return -EINVAL; 380 } 381 382 static int lpc32xx_gpio_to_irq_p01(struct gpio_chip *chip, unsigned offset) 383 { 384 return -ENXIO; 385 } 386 387 static int lpc32xx_gpio_to_irq_gpio_p3(struct gpio_chip *chip, unsigned offset) 388 { 389 return -ENXIO; 390 } 391 392 static int lpc32xx_gpio_to_irq_gpi_p3(struct gpio_chip *chip, unsigned offset) 393 { 394 return -ENXIO; 395 } 396 397 static struct lpc32xx_gpio_chip lpc32xx_gpiochip[] = { 398 { 399 .chip = { 400 .label = "gpio_p0", 401 .direction_input = lpc32xx_gpio_dir_input_p012, 402 .get = lpc32xx_gpio_get_value_p012, 403 .direction_output = lpc32xx_gpio_dir_output_p012, 404 .set = lpc32xx_gpio_set_value_p012, 405 .request = lpc32xx_gpio_request, 406 .to_irq = lpc32xx_gpio_to_irq_p01, 407 .base = LPC32XX_GPIO_P0_GRP, 408 .ngpio = LPC32XX_GPIO_P0_MAX, 409 .names = gpio_p0_names, 410 .can_sleep = false, 411 }, 412 .gpio_grp = &gpio_grp_regs_p0, 413 }, 414 { 415 .chip = { 416 .label = "gpio_p1", 417 .direction_input = lpc32xx_gpio_dir_input_p012, 418 .get = lpc32xx_gpio_get_value_p012, 419 .direction_output = lpc32xx_gpio_dir_output_p012, 420 .set = lpc32xx_gpio_set_value_p012, 421 .request = lpc32xx_gpio_request, 422 .to_irq = lpc32xx_gpio_to_irq_p01, 423 .base = LPC32XX_GPIO_P1_GRP, 424 .ngpio = LPC32XX_GPIO_P1_MAX, 425 .names = gpio_p1_names, 426 .can_sleep = false, 427 }, 428 .gpio_grp = &gpio_grp_regs_p1, 429 }, 430 { 431 .chip = { 432 .label = "gpio_p2", 433 .direction_input = lpc32xx_gpio_dir_input_p012, 434 .get = lpc32xx_gpio_get_value_p012, 435 .direction_output = lpc32xx_gpio_dir_output_p012, 436 .set = lpc32xx_gpio_set_value_p012, 437 .request = lpc32xx_gpio_request, 438 .base = LPC32XX_GPIO_P2_GRP, 439 .ngpio = LPC32XX_GPIO_P2_MAX, 440 .names = gpio_p2_names, 441 .can_sleep = false, 442 }, 443 .gpio_grp = &gpio_grp_regs_p2, 444 }, 445 { 446 .chip = { 447 .label = "gpio_p3", 448 .direction_input = lpc32xx_gpio_dir_input_p3, 449 .get = lpc32xx_gpio_get_value_p3, 450 .direction_output = lpc32xx_gpio_dir_output_p3, 451 .set = lpc32xx_gpio_set_value_p3, 452 .request = lpc32xx_gpio_request, 453 .to_irq = lpc32xx_gpio_to_irq_gpio_p3, 454 .base = LPC32XX_GPIO_P3_GRP, 455 .ngpio = LPC32XX_GPIO_P3_MAX, 456 .names = gpio_p3_names, 457 .can_sleep = false, 458 }, 459 .gpio_grp = &gpio_grp_regs_p3, 460 }, 461 { 462 .chip = { 463 .label = "gpi_p3", 464 .direction_input = lpc32xx_gpio_dir_in_always, 465 .get = lpc32xx_gpi_get_value, 466 .request = lpc32xx_gpio_request, 467 .to_irq = lpc32xx_gpio_to_irq_gpi_p3, 468 .base = LPC32XX_GPI_P3_GRP, 469 .ngpio = LPC32XX_GPI_P3_MAX, 470 .names = gpi_p3_names, 471 .can_sleep = false, 472 }, 473 .gpio_grp = &gpio_grp_regs_p3, 474 }, 475 { 476 .chip = { 477 .label = "gpo_p3", 478 .direction_output = lpc32xx_gpio_dir_out_always, 479 .set = lpc32xx_gpo_set_value, 480 .get = lpc32xx_gpo_get_value, 481 .request = lpc32xx_gpio_request, 482 .base = LPC32XX_GPO_P3_GRP, 483 .ngpio = LPC32XX_GPO_P3_MAX, 484 .names = gpo_p3_names, 485 .can_sleep = false, 486 }, 487 .gpio_grp = &gpio_grp_regs_p3, 488 }, 489 }; 490 491 static int lpc32xx_of_xlate(struct gpio_chip *gc, 492 const struct of_phandle_args *gpiospec, u32 *flags) 493 { 494 /* Is this the correct bank? */ 495 u32 bank = gpiospec->args[0]; 496 if ((bank >= ARRAY_SIZE(lpc32xx_gpiochip) || 497 (gc != &lpc32xx_gpiochip[bank].chip))) 498 return -EINVAL; 499 500 if (flags) 501 *flags = gpiospec->args[2]; 502 return gpiospec->args[1]; 503 } 504 505 static int lpc32xx_gpio_probe(struct platform_device *pdev) 506 { 507 int i; 508 void __iomem *reg_base; 509 510 reg_base = devm_platform_ioremap_resource(pdev, 0); 511 if (IS_ERR(reg_base)) 512 return PTR_ERR(reg_base); 513 514 for (i = 0; i < ARRAY_SIZE(lpc32xx_gpiochip); i++) { 515 if (pdev->dev.of_node) { 516 lpc32xx_gpiochip[i].chip.of_xlate = lpc32xx_of_xlate; 517 lpc32xx_gpiochip[i].chip.of_gpio_n_cells = 3; 518 lpc32xx_gpiochip[i].chip.of_node = pdev->dev.of_node; 519 lpc32xx_gpiochip[i].reg_base = reg_base; 520 } 521 devm_gpiochip_add_data(&pdev->dev, &lpc32xx_gpiochip[i].chip, 522 &lpc32xx_gpiochip[i]); 523 } 524 525 return 0; 526 } 527 528 #ifdef CONFIG_OF 529 static const struct of_device_id lpc32xx_gpio_of_match[] = { 530 { .compatible = "nxp,lpc3220-gpio", }, 531 { }, 532 }; 533 #endif 534 535 static struct platform_driver lpc32xx_gpio_driver = { 536 .driver = { 537 .name = "lpc32xx-gpio", 538 .of_match_table = of_match_ptr(lpc32xx_gpio_of_match), 539 }, 540 .probe = lpc32xx_gpio_probe, 541 }; 542 543 module_platform_driver(lpc32xx_gpio_driver); 544 545 MODULE_AUTHOR("Kevin Wells <kevin.wells@nxp.com>"); 546 MODULE_LICENSE("GPL"); 547 MODULE_DESCRIPTION("GPIO driver for LPC32xx SoC"); 548