1 /* 2 * Marvell 37xx SoC pinctrl driver 3 * 4 * Copyright (C) 2017 Marvell 5 * 6 * Gregory CLEMENT <gregory.clement@free-electrons.com> 7 * 8 * This file is licensed under the terms of the GNU General Public 9 * License version 2 or later. This program is licensed "as is" 10 * without any warranty of any kind, whether express or implied. 11 */ 12 13 #include <linux/gpio/driver.h> 14 #include <linux/mfd/syscon.h> 15 #include <linux/of.h> 16 #include <linux/of_address.h> 17 #include <linux/of_device.h> 18 #include <linux/of_irq.h> 19 #include <linux/pinctrl/pinconf-generic.h> 20 #include <linux/pinctrl/pinconf.h> 21 #include <linux/pinctrl/pinctrl.h> 22 #include <linux/pinctrl/pinmux.h> 23 #include <linux/platform_device.h> 24 #include <linux/regmap.h> 25 #include <linux/slab.h> 26 27 #include "../pinctrl-utils.h" 28 29 #define OUTPUT_EN 0x0 30 #define INPUT_VAL 0x10 31 #define OUTPUT_VAL 0x18 32 #define OUTPUT_CTL 0x20 33 #define SELECTION 0x30 34 35 #define IRQ_EN 0x0 36 #define IRQ_POL 0x08 37 #define IRQ_STATUS 0x10 38 #define IRQ_WKUP 0x18 39 40 #define NB_FUNCS 3 41 #define GPIO_PER_REG 32 42 43 /** 44 * struct armada_37xx_pin_group: represents group of pins of a pinmux function. 45 * The pins of a pinmux groups are composed of one or two groups of contiguous 46 * pins. 47 * @name: Name of the pin group, used to lookup the group. 48 * @start_pins: Index of the first pin of the main range of pins belonging to 49 * the group 50 * @npins: Number of pins included in the first range 51 * @reg_mask: Bit mask matching the group in the selection register 52 * @extra_pins: Index of the first pin of the optional second range of pins 53 * belonging to the group 54 * @npins: Number of pins included in the second optional range 55 * @funcs: A list of pinmux functions that can be selected for this group. 56 * @pins: List of the pins included in the group 57 */ 58 struct armada_37xx_pin_group { 59 const char *name; 60 unsigned int start_pin; 61 unsigned int npins; 62 u32 reg_mask; 63 u32 val[NB_FUNCS]; 64 unsigned int extra_pin; 65 unsigned int extra_npins; 66 const char *funcs[NB_FUNCS]; 67 unsigned int *pins; 68 }; 69 70 struct armada_37xx_pin_data { 71 u8 nr_pins; 72 char *name; 73 struct armada_37xx_pin_group *groups; 74 int ngroups; 75 }; 76 77 struct armada_37xx_pmx_func { 78 const char *name; 79 const char **groups; 80 unsigned int ngroups; 81 }; 82 83 struct armada_37xx_pinctrl { 84 struct regmap *regmap; 85 void __iomem *base; 86 const struct armada_37xx_pin_data *data; 87 struct device *dev; 88 struct gpio_chip gpio_chip; 89 struct irq_chip irq_chip; 90 spinlock_t irq_lock; 91 struct pinctrl_desc pctl; 92 struct pinctrl_dev *pctl_dev; 93 struct armada_37xx_pin_group *groups; 94 unsigned int ngroups; 95 struct armada_37xx_pmx_func *funcs; 96 unsigned int nfuncs; 97 }; 98 99 #define PIN_GRP(_name, _start, _nr, _mask, _func1, _func2) \ 100 { \ 101 .name = _name, \ 102 .start_pin = _start, \ 103 .npins = _nr, \ 104 .reg_mask = _mask, \ 105 .val = {0, _mask}, \ 106 .funcs = {_func1, _func2} \ 107 } 108 109 #define PIN_GRP_GPIO(_name, _start, _nr, _mask, _func1) \ 110 { \ 111 .name = _name, \ 112 .start_pin = _start, \ 113 .npins = _nr, \ 114 .reg_mask = _mask, \ 115 .val = {0, _mask}, \ 116 .funcs = {_func1, "gpio"} \ 117 } 118 119 #define PIN_GRP_GPIO_2(_name, _start, _nr, _mask, _val1, _val2, _func1) \ 120 { \ 121 .name = _name, \ 122 .start_pin = _start, \ 123 .npins = _nr, \ 124 .reg_mask = _mask, \ 125 .val = {_val1, _val2}, \ 126 .funcs = {_func1, "gpio"} \ 127 } 128 129 #define PIN_GRP_GPIO_3(_name, _start, _nr, _mask, _v1, _v2, _v3, _f1, _f2) \ 130 { \ 131 .name = _name, \ 132 .start_pin = _start, \ 133 .npins = _nr, \ 134 .reg_mask = _mask, \ 135 .val = {_v1, _v2, _v3}, \ 136 .funcs = {_f1, _f2, "gpio"} \ 137 } 138 139 #define PIN_GRP_EXTRA(_name, _start, _nr, _mask, _v1, _v2, _start2, _nr2, \ 140 _f1, _f2) \ 141 { \ 142 .name = _name, \ 143 .start_pin = _start, \ 144 .npins = _nr, \ 145 .reg_mask = _mask, \ 146 .val = {_v1, _v2}, \ 147 .extra_pin = _start2, \ 148 .extra_npins = _nr2, \ 149 .funcs = {_f1, _f2} \ 150 } 151 152 static struct armada_37xx_pin_group armada_37xx_nb_groups[] = { 153 PIN_GRP_GPIO("jtag", 20, 5, BIT(0), "jtag"), 154 PIN_GRP_GPIO("sdio0", 8, 3, BIT(1), "sdio"), 155 PIN_GRP_GPIO("emmc_nb", 27, 9, BIT(2), "emmc"), 156 PIN_GRP_GPIO("pwm0", 11, 1, BIT(3), "pwm"), 157 PIN_GRP_GPIO("pwm1", 12, 1, BIT(4), "pwm"), 158 PIN_GRP_GPIO("pwm2", 13, 1, BIT(5), "pwm"), 159 PIN_GRP_GPIO("pwm3", 14, 1, BIT(6), "pwm"), 160 PIN_GRP_GPIO("pmic1", 17, 1, BIT(7), "pmic"), 161 PIN_GRP_GPIO("pmic0", 16, 1, BIT(8), "pmic"), 162 PIN_GRP_GPIO("i2c2", 2, 2, BIT(9), "i2c"), 163 PIN_GRP_GPIO("i2c1", 0, 2, BIT(10), "i2c"), 164 PIN_GRP_GPIO("spi_cs1", 17, 1, BIT(12), "spi"), 165 PIN_GRP_GPIO_2("spi_cs2", 18, 1, BIT(13) | BIT(19), 0, BIT(13), "spi"), 166 PIN_GRP_GPIO_2("spi_cs3", 19, 1, BIT(14) | BIT(19), 0, BIT(14), "spi"), 167 PIN_GRP_GPIO("onewire", 4, 1, BIT(16), "onewire"), 168 PIN_GRP_GPIO("uart1", 25, 2, BIT(17), "uart"), 169 PIN_GRP_GPIO("spi_quad", 15, 2, BIT(18), "spi"), 170 PIN_GRP_EXTRA("uart2", 9, 2, BIT(1) | BIT(13) | BIT(14) | BIT(19), 171 BIT(1) | BIT(13) | BIT(14), BIT(1) | BIT(19), 172 18, 2, "gpio", "uart"), 173 PIN_GRP_GPIO("led0_od", 11, 1, BIT(20), "led"), 174 PIN_GRP_GPIO("led1_od", 12, 1, BIT(21), "led"), 175 PIN_GRP_GPIO("led2_od", 13, 1, BIT(22), "led"), 176 PIN_GRP_GPIO("led3_od", 14, 1, BIT(23), "led"), 177 178 }; 179 180 static struct armada_37xx_pin_group armada_37xx_sb_groups[] = { 181 PIN_GRP_GPIO("usb32_drvvbus0", 0, 1, BIT(0), "drvbus"), 182 PIN_GRP_GPIO("usb2_drvvbus1", 1, 1, BIT(1), "drvbus"), 183 PIN_GRP_GPIO("sdio_sb", 24, 6, BIT(2), "sdio"), 184 PIN_GRP_GPIO("rgmii", 6, 12, BIT(3), "mii"), 185 PIN_GRP_GPIO("pcie1", 3, 2, BIT(4), "pcie"), 186 PIN_GRP_GPIO("ptp", 20, 3, BIT(5), "ptp"), 187 PIN_GRP("ptp_clk", 21, 1, BIT(6), "ptp", "mii"), 188 PIN_GRP("ptp_trig", 22, 1, BIT(7), "ptp", "mii"), 189 PIN_GRP_GPIO_3("mii_col", 23, 1, BIT(8) | BIT(14), 0, BIT(8), BIT(14), 190 "mii", "mii_err"), 191 }; 192 193 static const struct armada_37xx_pin_data armada_37xx_pin_nb = { 194 .nr_pins = 36, 195 .name = "GPIO1", 196 .groups = armada_37xx_nb_groups, 197 .ngroups = ARRAY_SIZE(armada_37xx_nb_groups), 198 }; 199 200 static const struct armada_37xx_pin_data armada_37xx_pin_sb = { 201 .nr_pins = 30, 202 .name = "GPIO2", 203 .groups = armada_37xx_sb_groups, 204 .ngroups = ARRAY_SIZE(armada_37xx_sb_groups), 205 }; 206 207 static inline void armada_37xx_update_reg(unsigned int *reg, 208 unsigned int offset) 209 { 210 /* We never have more than 2 registers */ 211 if (offset >= GPIO_PER_REG) { 212 offset -= GPIO_PER_REG; 213 *reg += sizeof(u32); 214 } 215 } 216 217 static int armada_37xx_get_func_reg(struct armada_37xx_pin_group *grp, 218 const char *func) 219 { 220 int f; 221 222 for (f = 0; (f < NB_FUNCS) && grp->funcs[f]; f++) 223 if (!strcmp(grp->funcs[f], func)) 224 return f; 225 226 return -ENOTSUPP; 227 } 228 229 static struct armada_37xx_pin_group *armada_37xx_find_next_grp_by_pin( 230 struct armada_37xx_pinctrl *info, int pin, int *grp) 231 { 232 while (*grp < info->ngroups) { 233 struct armada_37xx_pin_group *group = &info->groups[*grp]; 234 int j; 235 236 *grp = *grp + 1; 237 for (j = 0; j < (group->npins + group->extra_npins); j++) 238 if (group->pins[j] == pin) 239 return group; 240 } 241 return NULL; 242 } 243 244 static int armada_37xx_pin_config_group_get(struct pinctrl_dev *pctldev, 245 unsigned int selector, unsigned long *config) 246 { 247 return -ENOTSUPP; 248 } 249 250 static int armada_37xx_pin_config_group_set(struct pinctrl_dev *pctldev, 251 unsigned int selector, unsigned long *configs, 252 unsigned int num_configs) 253 { 254 return -ENOTSUPP; 255 } 256 257 static const struct pinconf_ops armada_37xx_pinconf_ops = { 258 .is_generic = true, 259 .pin_config_group_get = armada_37xx_pin_config_group_get, 260 .pin_config_group_set = armada_37xx_pin_config_group_set, 261 }; 262 263 static int armada_37xx_get_groups_count(struct pinctrl_dev *pctldev) 264 { 265 struct armada_37xx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); 266 267 return info->ngroups; 268 } 269 270 static const char *armada_37xx_get_group_name(struct pinctrl_dev *pctldev, 271 unsigned int group) 272 { 273 struct armada_37xx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); 274 275 return info->groups[group].name; 276 } 277 278 static int armada_37xx_get_group_pins(struct pinctrl_dev *pctldev, 279 unsigned int selector, 280 const unsigned int **pins, 281 unsigned int *npins) 282 { 283 struct armada_37xx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); 284 285 if (selector >= info->ngroups) 286 return -EINVAL; 287 288 *pins = info->groups[selector].pins; 289 *npins = info->groups[selector].npins + 290 info->groups[selector].extra_npins; 291 292 return 0; 293 } 294 295 static const struct pinctrl_ops armada_37xx_pctrl_ops = { 296 .get_groups_count = armada_37xx_get_groups_count, 297 .get_group_name = armada_37xx_get_group_name, 298 .get_group_pins = armada_37xx_get_group_pins, 299 .dt_node_to_map = pinconf_generic_dt_node_to_map_group, 300 .dt_free_map = pinctrl_utils_free_map, 301 }; 302 303 /* 304 * Pinmux_ops handling 305 */ 306 307 static int armada_37xx_pmx_get_funcs_count(struct pinctrl_dev *pctldev) 308 { 309 struct armada_37xx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); 310 311 return info->nfuncs; 312 } 313 314 static const char *armada_37xx_pmx_get_func_name(struct pinctrl_dev *pctldev, 315 unsigned int selector) 316 { 317 struct armada_37xx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); 318 319 return info->funcs[selector].name; 320 } 321 322 static int armada_37xx_pmx_get_groups(struct pinctrl_dev *pctldev, 323 unsigned int selector, 324 const char * const **groups, 325 unsigned int * const num_groups) 326 { 327 struct armada_37xx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); 328 329 *groups = info->funcs[selector].groups; 330 *num_groups = info->funcs[selector].ngroups; 331 332 return 0; 333 } 334 335 static int armada_37xx_pmx_set_by_name(struct pinctrl_dev *pctldev, 336 const char *name, 337 struct armada_37xx_pin_group *grp) 338 { 339 struct armada_37xx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); 340 unsigned int reg = SELECTION; 341 unsigned int mask = grp->reg_mask; 342 int func, val; 343 344 dev_dbg(info->dev, "enable function %s group %s\n", 345 name, grp->name); 346 347 func = armada_37xx_get_func_reg(grp, name); 348 349 if (func < 0) 350 return func; 351 352 val = grp->val[func]; 353 354 regmap_update_bits(info->regmap, reg, mask, val); 355 356 return 0; 357 } 358 359 static int armada_37xx_pmx_set(struct pinctrl_dev *pctldev, 360 unsigned int selector, 361 unsigned int group) 362 { 363 364 struct armada_37xx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); 365 struct armada_37xx_pin_group *grp = &info->groups[group]; 366 const char *name = info->funcs[selector].name; 367 368 return armada_37xx_pmx_set_by_name(pctldev, name, grp); 369 } 370 371 static inline void armada_37xx_irq_update_reg(unsigned int *reg, 372 struct irq_data *d) 373 { 374 int offset = irqd_to_hwirq(d); 375 376 armada_37xx_update_reg(reg, offset); 377 } 378 379 static int armada_37xx_gpio_direction_input(struct gpio_chip *chip, 380 unsigned int offset) 381 { 382 struct armada_37xx_pinctrl *info = gpiochip_get_data(chip); 383 unsigned int reg = OUTPUT_EN; 384 unsigned int mask; 385 386 armada_37xx_update_reg(®, offset); 387 mask = BIT(offset); 388 389 return regmap_update_bits(info->regmap, reg, mask, 0); 390 } 391 392 static int armada_37xx_gpio_get_direction(struct gpio_chip *chip, 393 unsigned int offset) 394 { 395 struct armada_37xx_pinctrl *info = gpiochip_get_data(chip); 396 unsigned int reg = OUTPUT_EN; 397 unsigned int val, mask; 398 399 armada_37xx_update_reg(®, offset); 400 mask = BIT(offset); 401 regmap_read(info->regmap, reg, &val); 402 403 return !(val & mask); 404 } 405 406 static int armada_37xx_gpio_direction_output(struct gpio_chip *chip, 407 unsigned int offset, int value) 408 { 409 struct armada_37xx_pinctrl *info = gpiochip_get_data(chip); 410 unsigned int reg = OUTPUT_EN; 411 unsigned int mask; 412 413 armada_37xx_update_reg(®, offset); 414 mask = BIT(offset); 415 416 return regmap_update_bits(info->regmap, reg, mask, mask); 417 } 418 419 static int armada_37xx_gpio_get(struct gpio_chip *chip, unsigned int offset) 420 { 421 struct armada_37xx_pinctrl *info = gpiochip_get_data(chip); 422 unsigned int reg = INPUT_VAL; 423 unsigned int val, mask; 424 425 armada_37xx_update_reg(®, offset); 426 mask = BIT(offset); 427 428 regmap_read(info->regmap, reg, &val); 429 430 return (val & mask) != 0; 431 } 432 433 static void armada_37xx_gpio_set(struct gpio_chip *chip, unsigned int offset, 434 int value) 435 { 436 struct armada_37xx_pinctrl *info = gpiochip_get_data(chip); 437 unsigned int reg = OUTPUT_VAL; 438 unsigned int mask, val; 439 440 armada_37xx_update_reg(®, offset); 441 mask = BIT(offset); 442 val = value ? mask : 0; 443 444 regmap_update_bits(info->regmap, reg, mask, val); 445 } 446 447 static int armada_37xx_pmx_gpio_set_direction(struct pinctrl_dev *pctldev, 448 struct pinctrl_gpio_range *range, 449 unsigned int offset, bool input) 450 { 451 struct armada_37xx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); 452 struct gpio_chip *chip = range->gc; 453 454 dev_dbg(info->dev, "gpio_direction for pin %u as %s-%d to %s\n", 455 offset, range->name, offset, input ? "input" : "output"); 456 457 if (input) 458 armada_37xx_gpio_direction_input(chip, offset); 459 else 460 armada_37xx_gpio_direction_output(chip, offset, 0); 461 462 return 0; 463 } 464 465 static int armada_37xx_gpio_request_enable(struct pinctrl_dev *pctldev, 466 struct pinctrl_gpio_range *range, 467 unsigned int offset) 468 { 469 struct armada_37xx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); 470 struct armada_37xx_pin_group *group; 471 int grp = 0; 472 473 dev_dbg(info->dev, "requesting gpio %d\n", offset); 474 475 while ((group = armada_37xx_find_next_grp_by_pin(info, offset, &grp))) 476 armada_37xx_pmx_set_by_name(pctldev, "gpio", group); 477 478 return 0; 479 } 480 481 static const struct pinmux_ops armada_37xx_pmx_ops = { 482 .get_functions_count = armada_37xx_pmx_get_funcs_count, 483 .get_function_name = armada_37xx_pmx_get_func_name, 484 .get_function_groups = armada_37xx_pmx_get_groups, 485 .set_mux = armada_37xx_pmx_set, 486 .gpio_request_enable = armada_37xx_gpio_request_enable, 487 .gpio_set_direction = armada_37xx_pmx_gpio_set_direction, 488 }; 489 490 static const struct gpio_chip armada_37xx_gpiolib_chip = { 491 .request = gpiochip_generic_request, 492 .free = gpiochip_generic_free, 493 .set = armada_37xx_gpio_set, 494 .get = armada_37xx_gpio_get, 495 .get_direction = armada_37xx_gpio_get_direction, 496 .direction_input = armada_37xx_gpio_direction_input, 497 .direction_output = armada_37xx_gpio_direction_output, 498 .owner = THIS_MODULE, 499 }; 500 501 static void armada_37xx_irq_ack(struct irq_data *d) 502 { 503 struct gpio_chip *chip = irq_data_get_irq_chip_data(d); 504 struct armada_37xx_pinctrl *info = gpiochip_get_data(chip); 505 u32 reg = IRQ_STATUS; 506 unsigned long flags; 507 508 armada_37xx_irq_update_reg(®, d); 509 spin_lock_irqsave(&info->irq_lock, flags); 510 writel(d->mask, info->base + reg); 511 spin_unlock_irqrestore(&info->irq_lock, flags); 512 } 513 514 static void armada_37xx_irq_mask(struct irq_data *d) 515 { 516 struct gpio_chip *chip = irq_data_get_irq_chip_data(d); 517 struct armada_37xx_pinctrl *info = gpiochip_get_data(chip); 518 u32 val, reg = IRQ_EN; 519 unsigned long flags; 520 521 armada_37xx_irq_update_reg(®, d); 522 spin_lock_irqsave(&info->irq_lock, flags); 523 val = readl(info->base + reg); 524 writel(val & ~d->mask, info->base + reg); 525 spin_unlock_irqrestore(&info->irq_lock, flags); 526 } 527 528 static void armada_37xx_irq_unmask(struct irq_data *d) 529 { 530 struct gpio_chip *chip = irq_data_get_irq_chip_data(d); 531 struct armada_37xx_pinctrl *info = gpiochip_get_data(chip); 532 u32 val, reg = IRQ_EN; 533 unsigned long flags; 534 535 armada_37xx_irq_update_reg(®, d); 536 spin_lock_irqsave(&info->irq_lock, flags); 537 val = readl(info->base + reg); 538 writel(val | d->mask, info->base + reg); 539 spin_unlock_irqrestore(&info->irq_lock, flags); 540 } 541 542 static int armada_37xx_irq_set_wake(struct irq_data *d, unsigned int on) 543 { 544 struct gpio_chip *chip = irq_data_get_irq_chip_data(d); 545 struct armada_37xx_pinctrl *info = gpiochip_get_data(chip); 546 u32 val, reg = IRQ_WKUP; 547 unsigned long flags; 548 549 armada_37xx_irq_update_reg(®, d); 550 spin_lock_irqsave(&info->irq_lock, flags); 551 val = readl(info->base + reg); 552 if (on) 553 val |= (BIT(d->hwirq % GPIO_PER_REG)); 554 else 555 val &= ~(BIT(d->hwirq % GPIO_PER_REG)); 556 writel(val, info->base + reg); 557 spin_unlock_irqrestore(&info->irq_lock, flags); 558 559 return 0; 560 } 561 562 static int armada_37xx_irq_set_type(struct irq_data *d, unsigned int type) 563 { 564 struct gpio_chip *chip = irq_data_get_irq_chip_data(d); 565 struct armada_37xx_pinctrl *info = gpiochip_get_data(chip); 566 u32 val, reg = IRQ_POL; 567 unsigned long flags; 568 569 spin_lock_irqsave(&info->irq_lock, flags); 570 armada_37xx_irq_update_reg(®, d); 571 val = readl(info->base + reg); 572 switch (type) { 573 case IRQ_TYPE_EDGE_RISING: 574 val &= ~(BIT(d->hwirq % GPIO_PER_REG)); 575 break; 576 case IRQ_TYPE_EDGE_FALLING: 577 val |= (BIT(d->hwirq % GPIO_PER_REG)); 578 break; 579 default: 580 spin_unlock_irqrestore(&info->irq_lock, flags); 581 return -EINVAL; 582 } 583 writel(val, info->base + reg); 584 spin_unlock_irqrestore(&info->irq_lock, flags); 585 586 return 0; 587 } 588 589 590 static void armada_37xx_irq_handler(struct irq_desc *desc) 591 { 592 struct gpio_chip *gc = irq_desc_get_handler_data(desc); 593 struct irq_chip *chip = irq_desc_get_chip(desc); 594 struct armada_37xx_pinctrl *info = gpiochip_get_data(gc); 595 struct irq_domain *d = gc->irqdomain; 596 int i; 597 598 chained_irq_enter(chip, desc); 599 for (i = 0; i <= d->revmap_size / GPIO_PER_REG; i++) { 600 u32 status; 601 unsigned long flags; 602 603 spin_lock_irqsave(&info->irq_lock, flags); 604 status = readl_relaxed(info->base + IRQ_STATUS + 4 * i); 605 /* Manage only the interrupt that was enabled */ 606 status &= readl_relaxed(info->base + IRQ_EN + 4 * i); 607 spin_unlock_irqrestore(&info->irq_lock, flags); 608 while (status) { 609 u32 hwirq = ffs(status) - 1; 610 u32 virq = irq_find_mapping(d, hwirq + 611 i * GPIO_PER_REG); 612 613 generic_handle_irq(virq); 614 615 /* Update status in case a new IRQ appears */ 616 spin_lock_irqsave(&info->irq_lock, flags); 617 status = readl_relaxed(info->base + 618 IRQ_STATUS + 4 * i); 619 /* Manage only the interrupt that was enabled */ 620 status &= readl_relaxed(info->base + IRQ_EN + 4 * i); 621 spin_unlock_irqrestore(&info->irq_lock, flags); 622 } 623 } 624 chained_irq_exit(chip, desc); 625 } 626 627 static unsigned int armada_37xx_irq_startup(struct irq_data *d) 628 { 629 struct gpio_chip *chip = irq_data_get_irq_chip_data(d); 630 int irq = d->hwirq - chip->irq_base; 631 /* 632 * The mask field is a "precomputed bitmask for accessing the 633 * chip registers" which was introduced for the generic 634 * irqchip framework. As we don't use this framework, we can 635 * reuse this field for our own usage. 636 */ 637 d->mask = BIT(irq % GPIO_PER_REG); 638 639 armada_37xx_irq_unmask(d); 640 641 return 0; 642 } 643 644 static int armada_37xx_irqchip_register(struct platform_device *pdev, 645 struct armada_37xx_pinctrl *info) 646 { 647 struct device_node *np = info->dev->of_node; 648 struct gpio_chip *gc = &info->gpio_chip; 649 struct irq_chip *irqchip = &info->irq_chip; 650 struct resource res; 651 int ret = -ENODEV, i, nr_irq_parent; 652 653 /* Check if we have at least one gpio-controller child node */ 654 for_each_child_of_node(info->dev->of_node, np) { 655 if (of_property_read_bool(np, "gpio-controller")) { 656 ret = 0; 657 break; 658 } 659 }; 660 if (ret) 661 return ret; 662 663 nr_irq_parent = of_irq_count(np); 664 spin_lock_init(&info->irq_lock); 665 666 if (!nr_irq_parent) { 667 dev_err(&pdev->dev, "Invalid or no IRQ\n"); 668 return 0; 669 } 670 671 if (of_address_to_resource(info->dev->of_node, 1, &res)) { 672 dev_err(info->dev, "cannot find IO resource\n"); 673 return -ENOENT; 674 } 675 676 info->base = devm_ioremap_resource(info->dev, &res); 677 if (IS_ERR(info->base)) 678 return PTR_ERR(info->base); 679 680 irqchip->irq_ack = armada_37xx_irq_ack; 681 irqchip->irq_mask = armada_37xx_irq_mask; 682 irqchip->irq_unmask = armada_37xx_irq_unmask; 683 irqchip->irq_set_wake = armada_37xx_irq_set_wake; 684 irqchip->irq_set_type = armada_37xx_irq_set_type; 685 irqchip->irq_startup = armada_37xx_irq_startup; 686 irqchip->name = info->data->name; 687 ret = gpiochip_irqchip_add(gc, irqchip, 0, 688 handle_edge_irq, IRQ_TYPE_NONE); 689 if (ret) { 690 dev_info(&pdev->dev, "could not add irqchip\n"); 691 return ret; 692 } 693 694 /* 695 * Many interrupts are connected to the parent interrupt 696 * controller. But we do not take advantage of this and use 697 * the chained irq with all of them. 698 */ 699 for (i = 0; i < nr_irq_parent; i++) { 700 int irq = irq_of_parse_and_map(np, i); 701 702 if (irq < 0) 703 continue; 704 705 gpiochip_set_chained_irqchip(gc, irqchip, irq, 706 armada_37xx_irq_handler); 707 } 708 709 return 0; 710 } 711 712 static int armada_37xx_gpiochip_register(struct platform_device *pdev, 713 struct armada_37xx_pinctrl *info) 714 { 715 struct device_node *np; 716 struct gpio_chip *gc; 717 int ret = -ENODEV; 718 719 for_each_child_of_node(info->dev->of_node, np) { 720 if (of_find_property(np, "gpio-controller", NULL)) { 721 ret = 0; 722 break; 723 } 724 }; 725 if (ret) 726 return ret; 727 728 info->gpio_chip = armada_37xx_gpiolib_chip; 729 730 gc = &info->gpio_chip; 731 gc->ngpio = info->data->nr_pins; 732 gc->parent = &pdev->dev; 733 gc->base = -1; 734 gc->of_node = np; 735 gc->label = info->data->name; 736 737 ret = devm_gpiochip_add_data(&pdev->dev, gc, info); 738 if (ret) 739 return ret; 740 ret = armada_37xx_irqchip_register(pdev, info); 741 if (ret) 742 return ret; 743 744 return 0; 745 } 746 747 /** 748 * armada_37xx_add_function() - Add a new function to the list 749 * @funcs: array of function to add the new one 750 * @funcsize: size of the remaining space for the function 751 * @name: name of the function to add 752 * 753 * If it is a new function then create it by adding its name else 754 * increment the number of group associated to this function. 755 */ 756 static int armada_37xx_add_function(struct armada_37xx_pmx_func *funcs, 757 int *funcsize, const char *name) 758 { 759 int i = 0; 760 761 if (*funcsize <= 0) 762 return -EOVERFLOW; 763 764 while (funcs->ngroups) { 765 /* function already there */ 766 if (strcmp(funcs->name, name) == 0) { 767 funcs->ngroups++; 768 769 return -EEXIST; 770 } 771 funcs++; 772 i++; 773 } 774 775 /* append new unique function */ 776 funcs->name = name; 777 funcs->ngroups = 1; 778 (*funcsize)--; 779 780 return 0; 781 } 782 783 /** 784 * armada_37xx_fill_group() - complete the group array 785 * @info: info driver instance 786 * 787 * Based on the data available from the armada_37xx_pin_group array 788 * completes the last member of the struct for each function: the list 789 * of the groups associated to this function. 790 * 791 */ 792 static int armada_37xx_fill_group(struct armada_37xx_pinctrl *info) 793 { 794 int n, num = 0, funcsize = info->data->nr_pins; 795 796 for (n = 0; n < info->ngroups; n++) { 797 struct armada_37xx_pin_group *grp = &info->groups[n]; 798 int i, j, f; 799 800 grp->pins = devm_kzalloc(info->dev, 801 (grp->npins + grp->extra_npins) * 802 sizeof(*grp->pins), GFP_KERNEL); 803 if (!grp->pins) 804 return -ENOMEM; 805 806 for (i = 0; i < grp->npins; i++) 807 grp->pins[i] = grp->start_pin + i; 808 809 for (j = 0; j < grp->extra_npins; j++) 810 grp->pins[i+j] = grp->extra_pin + j; 811 812 for (f = 0; (f < NB_FUNCS) && grp->funcs[f]; f++) { 813 int ret; 814 /* check for unique functions and count groups */ 815 ret = armada_37xx_add_function(info->funcs, &funcsize, 816 grp->funcs[f]); 817 if (ret == -EOVERFLOW) 818 dev_err(info->dev, 819 "More functions than pins(%d)\n", 820 info->data->nr_pins); 821 if (ret < 0) 822 continue; 823 num++; 824 } 825 } 826 827 info->nfuncs = num; 828 829 return 0; 830 } 831 832 /** 833 * armada_37xx_fill_funcs() - complete the funcs array 834 * @info: info driver instance 835 * 836 * Based on the data available from the armada_37xx_pin_group array 837 * completes the last two member of the struct for each group: 838 * - the list of the pins included in the group 839 * - the list of pinmux functions that can be selected for this group 840 * 841 */ 842 static int armada_37xx_fill_func(struct armada_37xx_pinctrl *info) 843 { 844 struct armada_37xx_pmx_func *funcs = info->funcs; 845 int n; 846 847 for (n = 0; n < info->nfuncs; n++) { 848 const char *name = funcs[n].name; 849 const char **groups; 850 int g; 851 852 funcs[n].groups = devm_kzalloc(info->dev, funcs[n].ngroups * 853 sizeof(*(funcs[n].groups)), 854 GFP_KERNEL); 855 if (!funcs[n].groups) 856 return -ENOMEM; 857 858 groups = funcs[n].groups; 859 860 for (g = 0; g < info->ngroups; g++) { 861 struct armada_37xx_pin_group *gp = &info->groups[g]; 862 int f; 863 864 for (f = 0; (f < NB_FUNCS) && gp->funcs[f]; f++) { 865 if (strcmp(gp->funcs[f], name) == 0) { 866 *groups = gp->name; 867 groups++; 868 } 869 } 870 } 871 } 872 return 0; 873 } 874 875 static int armada_37xx_pinctrl_register(struct platform_device *pdev, 876 struct armada_37xx_pinctrl *info) 877 { 878 const struct armada_37xx_pin_data *pin_data = info->data; 879 struct pinctrl_desc *ctrldesc = &info->pctl; 880 struct pinctrl_pin_desc *pindesc, *pdesc; 881 int pin, ret; 882 883 info->groups = pin_data->groups; 884 info->ngroups = pin_data->ngroups; 885 886 ctrldesc->name = "armada_37xx-pinctrl"; 887 ctrldesc->owner = THIS_MODULE; 888 ctrldesc->pctlops = &armada_37xx_pctrl_ops; 889 ctrldesc->pmxops = &armada_37xx_pmx_ops; 890 ctrldesc->confops = &armada_37xx_pinconf_ops; 891 892 pindesc = devm_kzalloc(&pdev->dev, sizeof(*pindesc) * 893 pin_data->nr_pins, GFP_KERNEL); 894 if (!pindesc) 895 return -ENOMEM; 896 897 ctrldesc->pins = pindesc; 898 ctrldesc->npins = pin_data->nr_pins; 899 900 pdesc = pindesc; 901 for (pin = 0; pin < pin_data->nr_pins; pin++) { 902 pdesc->number = pin; 903 pdesc->name = kasprintf(GFP_KERNEL, "%s-%d", 904 pin_data->name, pin); 905 pdesc++; 906 } 907 908 /* 909 * we allocate functions for number of pins and hope there are 910 * fewer unique functions than pins available 911 */ 912 info->funcs = devm_kzalloc(&pdev->dev, pin_data->nr_pins * 913 sizeof(struct armada_37xx_pmx_func), GFP_KERNEL); 914 if (!info->funcs) 915 return -ENOMEM; 916 917 918 ret = armada_37xx_fill_group(info); 919 if (ret) 920 return ret; 921 922 ret = armada_37xx_fill_func(info); 923 if (ret) 924 return ret; 925 926 info->pctl_dev = devm_pinctrl_register(&pdev->dev, ctrldesc, info); 927 if (IS_ERR(info->pctl_dev)) { 928 dev_err(&pdev->dev, "could not register pinctrl driver\n"); 929 return PTR_ERR(info->pctl_dev); 930 } 931 932 return 0; 933 } 934 935 static const struct of_device_id armada_37xx_pinctrl_of_match[] = { 936 { 937 .compatible = "marvell,armada3710-sb-pinctrl", 938 .data = (void *)&armada_37xx_pin_sb, 939 }, 940 { 941 .compatible = "marvell,armada3710-nb-pinctrl", 942 .data = (void *)&armada_37xx_pin_nb, 943 }, 944 { }, 945 }; 946 947 static int __init armada_37xx_pinctrl_probe(struct platform_device *pdev) 948 { 949 struct armada_37xx_pinctrl *info; 950 struct device *dev = &pdev->dev; 951 struct device_node *np = dev->of_node; 952 struct regmap *regmap; 953 int ret; 954 955 info = devm_kzalloc(dev, sizeof(struct armada_37xx_pinctrl), 956 GFP_KERNEL); 957 if (!info) 958 return -ENOMEM; 959 960 info->dev = dev; 961 962 regmap = syscon_node_to_regmap(np); 963 if (IS_ERR(regmap)) { 964 dev_err(&pdev->dev, "cannot get regmap\n"); 965 return PTR_ERR(regmap); 966 } 967 info->regmap = regmap; 968 969 info->data = of_device_get_match_data(dev); 970 971 ret = armada_37xx_pinctrl_register(pdev, info); 972 if (ret) 973 return ret; 974 975 ret = armada_37xx_gpiochip_register(pdev, info); 976 if (ret) 977 return ret; 978 979 platform_set_drvdata(pdev, info); 980 981 return 0; 982 } 983 984 static struct platform_driver armada_37xx_pinctrl_driver = { 985 .driver = { 986 .name = "armada-37xx-pinctrl", 987 .of_match_table = armada_37xx_pinctrl_of_match, 988 }, 989 }; 990 991 builtin_platform_driver_probe(armada_37xx_pinctrl_driver, 992 armada_37xx_pinctrl_probe); 993