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_irq.h> 17 #include <linux/pinctrl/pinconf-generic.h> 18 #include <linux/pinctrl/pinconf.h> 19 #include <linux/pinctrl/pinctrl.h> 20 #include <linux/pinctrl/pinmux.h> 21 #include <linux/platform_device.h> 22 #include <linux/property.h> 23 #include <linux/regmap.h> 24 #include <linux/seq_file.h> 25 #include <linux/slab.h> 26 #include <linux/string_helpers.h> 27 28 #include "../pinctrl-utils.h" 29 30 #define OUTPUT_EN 0x0 31 #define INPUT_VAL 0x10 32 #define OUTPUT_VAL 0x18 33 #define OUTPUT_CTL 0x20 34 #define SELECTION 0x30 35 36 #define IRQ_EN 0x0 37 #define IRQ_POL 0x08 38 #define IRQ_STATUS 0x10 39 #define IRQ_WKUP 0x18 40 41 #define NB_FUNCS 3 42 #define GPIO_PER_REG 32 43 44 /** 45 * struct armada_37xx_pin_group: represents group of pins of a pinmux function. 46 * The pins of a pinmux groups are composed of one or two groups of contiguous 47 * pins. 48 * @name: Name of the pin group, used to lookup the group. 49 * @start_pin: Index of the first pin of the main range of pins belonging to 50 * the group 51 * @npins: Number of pins included in the first range 52 * @reg_mask: Bit mask matching the group in the selection register 53 * @val: Value to write to the registers for a given function 54 * @extra_pin: Index of the first pin of the optional second range of pins 55 * belonging to the group 56 * @extra_npins:Number of pins included in the second optional range 57 * @funcs: A list of pinmux functions that can be selected for this group. 58 * @pins: List of the pins included in the group 59 */ 60 struct armada_37xx_pin_group { 61 const char *name; 62 unsigned int start_pin; 63 unsigned int npins; 64 u32 reg_mask; 65 u32 val[NB_FUNCS]; 66 unsigned int extra_pin; 67 unsigned int extra_npins; 68 const char *funcs[NB_FUNCS]; 69 unsigned int *pins; 70 }; 71 72 struct armada_37xx_pin_data { 73 u8 nr_pins; 74 char *name; 75 struct armada_37xx_pin_group *groups; 76 int ngroups; 77 }; 78 79 struct armada_37xx_pmx_func { 80 const char *name; 81 const char **groups; 82 unsigned int ngroups; 83 }; 84 85 struct armada_37xx_pm_state { 86 u32 out_en_l; 87 u32 out_en_h; 88 u32 out_val_l; 89 u32 out_val_h; 90 u32 irq_en_l; 91 u32 irq_en_h; 92 u32 irq_pol_l; 93 u32 irq_pol_h; 94 u32 selection; 95 }; 96 97 struct armada_37xx_pinctrl { 98 struct regmap *regmap; 99 void __iomem *base; 100 const struct armada_37xx_pin_data *data; 101 struct device *dev; 102 struct gpio_chip gpio_chip; 103 raw_spinlock_t irq_lock; 104 struct pinctrl_desc pctl; 105 struct pinctrl_dev *pctl_dev; 106 struct armada_37xx_pin_group *groups; 107 unsigned int ngroups; 108 struct armada_37xx_pmx_func *funcs; 109 unsigned int nfuncs; 110 struct armada_37xx_pm_state pm; 111 }; 112 113 #define PIN_GRP_GPIO_0(_name, _start, _nr) \ 114 { \ 115 .name = _name, \ 116 .start_pin = _start, \ 117 .npins = _nr, \ 118 .reg_mask = 0, \ 119 .val = {0}, \ 120 .funcs = {"gpio"} \ 121 } 122 123 #define PIN_GRP_GPIO(_name, _start, _nr, _mask, _func1) \ 124 { \ 125 .name = _name, \ 126 .start_pin = _start, \ 127 .npins = _nr, \ 128 .reg_mask = _mask, \ 129 .val = {0, _mask}, \ 130 .funcs = {_func1, "gpio"} \ 131 } 132 133 #define PIN_GRP_GPIO_2(_name, _start, _nr, _mask, _val1, _val2, _func1) \ 134 { \ 135 .name = _name, \ 136 .start_pin = _start, \ 137 .npins = _nr, \ 138 .reg_mask = _mask, \ 139 .val = {_val1, _val2}, \ 140 .funcs = {_func1, "gpio"} \ 141 } 142 143 #define PIN_GRP_GPIO_3(_name, _start, _nr, _mask, _v1, _v2, _v3, _f1, _f2) \ 144 { \ 145 .name = _name, \ 146 .start_pin = _start, \ 147 .npins = _nr, \ 148 .reg_mask = _mask, \ 149 .val = {_v1, _v2, _v3}, \ 150 .funcs = {_f1, _f2, "gpio"} \ 151 } 152 153 #define PIN_GRP_EXTRA(_name, _start, _nr, _mask, _v1, _v2, _start2, _nr2, \ 154 _f1, _f2) \ 155 { \ 156 .name = _name, \ 157 .start_pin = _start, \ 158 .npins = _nr, \ 159 .reg_mask = _mask, \ 160 .val = {_v1, _v2}, \ 161 .extra_pin = _start2, \ 162 .extra_npins = _nr2, \ 163 .funcs = {_f1, _f2} \ 164 } 165 166 static struct armada_37xx_pin_group armada_37xx_nb_groups[] = { 167 PIN_GRP_GPIO("jtag", 20, 5, BIT(0), "jtag"), 168 PIN_GRP_GPIO("sdio0", 8, 3, BIT(1), "sdio"), 169 PIN_GRP_GPIO("emmc_nb", 27, 9, BIT(2), "emmc"), 170 PIN_GRP_GPIO_3("pwm0", 11, 1, BIT(3) | BIT(20), 0, BIT(20), BIT(3), 171 "pwm", "led"), 172 PIN_GRP_GPIO_3("pwm1", 12, 1, BIT(4) | BIT(21), 0, BIT(21), BIT(4), 173 "pwm", "led"), 174 PIN_GRP_GPIO_3("pwm2", 13, 1, BIT(5) | BIT(22), 0, BIT(22), BIT(5), 175 "pwm", "led"), 176 PIN_GRP_GPIO_3("pwm3", 14, 1, BIT(6) | BIT(23), 0, BIT(23), BIT(6), 177 "pwm", "led"), 178 PIN_GRP_GPIO("pmic1", 7, 1, BIT(7), "pmic"), 179 PIN_GRP_GPIO("pmic0", 6, 1, BIT(8), "pmic"), 180 PIN_GRP_GPIO_0("gpio1_5", 5, 1), 181 PIN_GRP_GPIO("i2c2", 2, 2, BIT(9), "i2c"), 182 PIN_GRP_GPIO("i2c1", 0, 2, BIT(10), "i2c"), 183 PIN_GRP_GPIO("spi_cs1", 17, 1, BIT(12), "spi"), 184 PIN_GRP_GPIO_2("spi_cs2", 18, 1, BIT(13) | BIT(19), 0, BIT(13), "spi"), 185 PIN_GRP_GPIO_2("spi_cs3", 19, 1, BIT(14) | BIT(19), 0, BIT(14), "spi"), 186 PIN_GRP_GPIO("onewire", 4, 1, BIT(16), "onewire"), 187 PIN_GRP_GPIO("uart1", 25, 2, BIT(17), "uart"), 188 PIN_GRP_GPIO("spi_quad", 15, 2, BIT(18), "spi"), 189 PIN_GRP_EXTRA("uart2", 9, 2, BIT(1) | BIT(13) | BIT(14) | BIT(19), 190 BIT(1) | BIT(13) | BIT(14), BIT(1) | BIT(19), 191 18, 2, "gpio", "uart"), 192 }; 193 194 static struct armada_37xx_pin_group armada_37xx_sb_groups[] = { 195 PIN_GRP_GPIO("usb32_drvvbus0", 0, 1, BIT(0), "drvbus"), 196 PIN_GRP_GPIO("usb2_drvvbus1", 1, 1, BIT(1), "drvbus"), 197 PIN_GRP_GPIO_0("gpio2_2", 2, 1), 198 PIN_GRP_GPIO("sdio_sb", 24, 6, BIT(2), "sdio"), 199 PIN_GRP_GPIO("rgmii", 6, 12, BIT(3), "mii"), 200 PIN_GRP_GPIO("smi", 18, 2, BIT(4), "smi"), 201 PIN_GRP_GPIO("pcie1", 3, 1, BIT(5), "pcie"), /* this actually controls "pcie1_reset" */ 202 PIN_GRP_GPIO("pcie1_clkreq", 4, 1, BIT(9), "pcie"), 203 PIN_GRP_GPIO("pcie1_wakeup", 5, 1, BIT(10), "pcie"), 204 PIN_GRP_GPIO("ptp", 20, 1, BIT(11), "ptp"), 205 PIN_GRP_GPIO_3("ptp_clk", 21, 1, BIT(6) | BIT(12), 0, BIT(6), BIT(12), 206 "ptp", "mii"), 207 PIN_GRP_GPIO_3("ptp_trig", 22, 1, BIT(7) | BIT(13), 0, BIT(7), BIT(13), 208 "ptp", "mii"), 209 PIN_GRP_GPIO_3("mii_col", 23, 1, BIT(8) | BIT(14), 0, BIT(8), BIT(14), 210 "mii", "mii_err"), 211 }; 212 213 static const struct armada_37xx_pin_data armada_37xx_pin_nb = { 214 .nr_pins = 36, 215 .name = "GPIO1", 216 .groups = armada_37xx_nb_groups, 217 .ngroups = ARRAY_SIZE(armada_37xx_nb_groups), 218 }; 219 220 static const struct armada_37xx_pin_data armada_37xx_pin_sb = { 221 .nr_pins = 30, 222 .name = "GPIO2", 223 .groups = armada_37xx_sb_groups, 224 .ngroups = ARRAY_SIZE(armada_37xx_sb_groups), 225 }; 226 227 static inline void armada_37xx_update_reg(unsigned int *reg, 228 unsigned int *offset) 229 { 230 /* We never have more than 2 registers */ 231 if (*offset >= GPIO_PER_REG) { 232 *offset -= GPIO_PER_REG; 233 *reg += sizeof(u32); 234 } 235 } 236 237 static struct armada_37xx_pin_group *armada_37xx_find_next_grp_by_pin( 238 struct armada_37xx_pinctrl *info, int pin, int *grp) 239 { 240 while (*grp < info->ngroups) { 241 struct armada_37xx_pin_group *group = &info->groups[*grp]; 242 int j; 243 244 *grp = *grp + 1; 245 for (j = 0; j < (group->npins + group->extra_npins); j++) 246 if (group->pins[j] == pin) 247 return group; 248 } 249 return NULL; 250 } 251 252 static int armada_37xx_pin_config_group_get(struct pinctrl_dev *pctldev, 253 unsigned int selector, unsigned long *config) 254 { 255 return -ENOTSUPP; 256 } 257 258 static int armada_37xx_pin_config_group_set(struct pinctrl_dev *pctldev, 259 unsigned int selector, unsigned long *configs, 260 unsigned int num_configs) 261 { 262 return -ENOTSUPP; 263 } 264 265 static const struct pinconf_ops armada_37xx_pinconf_ops = { 266 .is_generic = true, 267 .pin_config_group_get = armada_37xx_pin_config_group_get, 268 .pin_config_group_set = armada_37xx_pin_config_group_set, 269 }; 270 271 static int armada_37xx_get_groups_count(struct pinctrl_dev *pctldev) 272 { 273 struct armada_37xx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); 274 275 return info->ngroups; 276 } 277 278 static const char *armada_37xx_get_group_name(struct pinctrl_dev *pctldev, 279 unsigned int group) 280 { 281 struct armada_37xx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); 282 283 return info->groups[group].name; 284 } 285 286 static int armada_37xx_get_group_pins(struct pinctrl_dev *pctldev, 287 unsigned int selector, 288 const unsigned int **pins, 289 unsigned int *npins) 290 { 291 struct armada_37xx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); 292 293 if (selector >= info->ngroups) 294 return -EINVAL; 295 296 *pins = info->groups[selector].pins; 297 *npins = info->groups[selector].npins + 298 info->groups[selector].extra_npins; 299 300 return 0; 301 } 302 303 static const struct pinctrl_ops armada_37xx_pctrl_ops = { 304 .get_groups_count = armada_37xx_get_groups_count, 305 .get_group_name = armada_37xx_get_group_name, 306 .get_group_pins = armada_37xx_get_group_pins, 307 .dt_node_to_map = pinconf_generic_dt_node_to_map_group, 308 .dt_free_map = pinctrl_utils_free_map, 309 }; 310 311 /* 312 * Pinmux_ops handling 313 */ 314 315 static int armada_37xx_pmx_get_funcs_count(struct pinctrl_dev *pctldev) 316 { 317 struct armada_37xx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); 318 319 return info->nfuncs; 320 } 321 322 static const char *armada_37xx_pmx_get_func_name(struct pinctrl_dev *pctldev, 323 unsigned int selector) 324 { 325 struct armada_37xx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); 326 327 return info->funcs[selector].name; 328 } 329 330 static int armada_37xx_pmx_get_groups(struct pinctrl_dev *pctldev, 331 unsigned int selector, 332 const char * const **groups, 333 unsigned int * const num_groups) 334 { 335 struct armada_37xx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); 336 337 *groups = info->funcs[selector].groups; 338 *num_groups = info->funcs[selector].ngroups; 339 340 return 0; 341 } 342 343 static int armada_37xx_pmx_set_by_name(struct pinctrl_dev *pctldev, 344 const char *name, 345 struct armada_37xx_pin_group *grp) 346 { 347 struct armada_37xx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); 348 struct device *dev = info->dev; 349 unsigned int reg = SELECTION; 350 unsigned int mask = grp->reg_mask; 351 int func, val; 352 353 dev_dbg(dev, "enable function %s group %s\n", name, grp->name); 354 355 func = match_string(grp->funcs, NB_FUNCS, name); 356 if (func < 0) 357 return -ENOTSUPP; 358 359 val = grp->val[func]; 360 361 regmap_update_bits(info->regmap, reg, mask, val); 362 363 return 0; 364 } 365 366 static int armada_37xx_pmx_set(struct pinctrl_dev *pctldev, 367 unsigned int selector, 368 unsigned int group) 369 { 370 371 struct armada_37xx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); 372 struct armada_37xx_pin_group *grp = &info->groups[group]; 373 const char *name = info->funcs[selector].name; 374 375 return armada_37xx_pmx_set_by_name(pctldev, name, grp); 376 } 377 378 static inline void armada_37xx_irq_update_reg(unsigned int *reg, 379 struct irq_data *d) 380 { 381 int offset = irqd_to_hwirq(d); 382 383 armada_37xx_update_reg(reg, &offset); 384 } 385 386 static int armada_37xx_gpio_direction_input(struct gpio_chip *chip, 387 unsigned int offset) 388 { 389 struct armada_37xx_pinctrl *info = gpiochip_get_data(chip); 390 unsigned int reg = OUTPUT_EN; 391 unsigned int mask; 392 393 armada_37xx_update_reg(®, &offset); 394 mask = BIT(offset); 395 396 return regmap_update_bits(info->regmap, reg, mask, 0); 397 } 398 399 static int armada_37xx_gpio_get_direction(struct gpio_chip *chip, 400 unsigned int offset) 401 { 402 struct armada_37xx_pinctrl *info = gpiochip_get_data(chip); 403 unsigned int reg = OUTPUT_EN; 404 unsigned int val, mask; 405 406 armada_37xx_update_reg(®, &offset); 407 mask = BIT(offset); 408 regmap_read(info->regmap, reg, &val); 409 410 if (val & mask) 411 return GPIO_LINE_DIRECTION_OUT; 412 413 return GPIO_LINE_DIRECTION_IN; 414 } 415 416 static int armada_37xx_gpio_direction_output(struct gpio_chip *chip, 417 unsigned int offset, int value) 418 { 419 struct armada_37xx_pinctrl *info = gpiochip_get_data(chip); 420 unsigned int reg = OUTPUT_EN; 421 unsigned int mask, val, ret; 422 423 armada_37xx_update_reg(®, &offset); 424 mask = BIT(offset); 425 426 ret = regmap_update_bits(info->regmap, reg, mask, mask); 427 428 if (ret) 429 return ret; 430 431 reg = OUTPUT_VAL; 432 val = value ? mask : 0; 433 regmap_update_bits(info->regmap, reg, mask, val); 434 435 return 0; 436 } 437 438 static int armada_37xx_gpio_get(struct gpio_chip *chip, unsigned int offset) 439 { 440 struct armada_37xx_pinctrl *info = gpiochip_get_data(chip); 441 unsigned int reg = INPUT_VAL; 442 unsigned int val, mask; 443 444 armada_37xx_update_reg(®, &offset); 445 mask = BIT(offset); 446 447 regmap_read(info->regmap, reg, &val); 448 449 return (val & mask) != 0; 450 } 451 452 static void armada_37xx_gpio_set(struct gpio_chip *chip, unsigned int offset, 453 int value) 454 { 455 struct armada_37xx_pinctrl *info = gpiochip_get_data(chip); 456 unsigned int reg = OUTPUT_VAL; 457 unsigned int mask, val; 458 459 armada_37xx_update_reg(®, &offset); 460 mask = BIT(offset); 461 val = value ? mask : 0; 462 463 regmap_update_bits(info->regmap, reg, mask, val); 464 } 465 466 static int armada_37xx_pmx_gpio_set_direction(struct pinctrl_dev *pctldev, 467 struct pinctrl_gpio_range *range, 468 unsigned int offset, bool input) 469 { 470 struct armada_37xx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); 471 struct gpio_chip *chip = range->gc; 472 473 dev_dbg(info->dev, "gpio_direction for pin %u as %s-%d to %s\n", 474 offset, range->name, offset, input ? "input" : "output"); 475 476 if (input) 477 armada_37xx_gpio_direction_input(chip, offset); 478 else 479 armada_37xx_gpio_direction_output(chip, offset, 0); 480 481 return 0; 482 } 483 484 static int armada_37xx_gpio_request_enable(struct pinctrl_dev *pctldev, 485 struct pinctrl_gpio_range *range, 486 unsigned int offset) 487 { 488 struct armada_37xx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); 489 struct armada_37xx_pin_group *group; 490 int grp = 0; 491 int ret; 492 493 dev_dbg(info->dev, "requesting gpio %d\n", offset); 494 495 while ((group = armada_37xx_find_next_grp_by_pin(info, offset, &grp))) { 496 ret = armada_37xx_pmx_set_by_name(pctldev, "gpio", group); 497 if (ret) 498 return ret; 499 } 500 501 return 0; 502 } 503 504 static const struct pinmux_ops armada_37xx_pmx_ops = { 505 .get_functions_count = armada_37xx_pmx_get_funcs_count, 506 .get_function_name = armada_37xx_pmx_get_func_name, 507 .get_function_groups = armada_37xx_pmx_get_groups, 508 .set_mux = armada_37xx_pmx_set, 509 .gpio_request_enable = armada_37xx_gpio_request_enable, 510 .gpio_set_direction = armada_37xx_pmx_gpio_set_direction, 511 }; 512 513 static const struct gpio_chip armada_37xx_gpiolib_chip = { 514 .request = gpiochip_generic_request, 515 .free = gpiochip_generic_free, 516 .set = armada_37xx_gpio_set, 517 .get = armada_37xx_gpio_get, 518 .get_direction = armada_37xx_gpio_get_direction, 519 .direction_input = armada_37xx_gpio_direction_input, 520 .direction_output = armada_37xx_gpio_direction_output, 521 .owner = THIS_MODULE, 522 }; 523 524 static void armada_37xx_irq_ack(struct irq_data *d) 525 { 526 struct gpio_chip *chip = irq_data_get_irq_chip_data(d); 527 struct armada_37xx_pinctrl *info = gpiochip_get_data(chip); 528 u32 reg = IRQ_STATUS; 529 unsigned long flags; 530 531 armada_37xx_irq_update_reg(®, d); 532 raw_spin_lock_irqsave(&info->irq_lock, flags); 533 writel(d->mask, info->base + reg); 534 raw_spin_unlock_irqrestore(&info->irq_lock, flags); 535 } 536 537 static void armada_37xx_irq_mask(struct irq_data *d) 538 { 539 struct gpio_chip *chip = irq_data_get_irq_chip_data(d); 540 struct armada_37xx_pinctrl *info = gpiochip_get_data(chip); 541 u32 val, reg = IRQ_EN; 542 unsigned long flags; 543 544 armada_37xx_irq_update_reg(®, d); 545 raw_spin_lock_irqsave(&info->irq_lock, flags); 546 val = readl(info->base + reg); 547 writel(val & ~d->mask, info->base + reg); 548 raw_spin_unlock_irqrestore(&info->irq_lock, flags); 549 gpiochip_disable_irq(chip, irqd_to_hwirq(d)); 550 } 551 552 static void armada_37xx_irq_unmask(struct irq_data *d) 553 { 554 struct gpio_chip *chip = irq_data_get_irq_chip_data(d); 555 struct armada_37xx_pinctrl *info = gpiochip_get_data(chip); 556 u32 val, reg = IRQ_EN; 557 unsigned long flags; 558 559 gpiochip_enable_irq(chip, irqd_to_hwirq(d)); 560 armada_37xx_irq_update_reg(®, d); 561 raw_spin_lock_irqsave(&info->irq_lock, flags); 562 val = readl(info->base + reg); 563 writel(val | d->mask, info->base + reg); 564 raw_spin_unlock_irqrestore(&info->irq_lock, flags); 565 } 566 567 static int armada_37xx_irq_set_wake(struct irq_data *d, unsigned int on) 568 { 569 struct gpio_chip *chip = irq_data_get_irq_chip_data(d); 570 struct armada_37xx_pinctrl *info = gpiochip_get_data(chip); 571 u32 val, reg = IRQ_WKUP; 572 unsigned long flags; 573 574 armada_37xx_irq_update_reg(®, d); 575 raw_spin_lock_irqsave(&info->irq_lock, flags); 576 val = readl(info->base + reg); 577 if (on) 578 val |= (BIT(d->hwirq % GPIO_PER_REG)); 579 else 580 val &= ~(BIT(d->hwirq % GPIO_PER_REG)); 581 writel(val, info->base + reg); 582 raw_spin_unlock_irqrestore(&info->irq_lock, flags); 583 584 return 0; 585 } 586 587 static int armada_37xx_irq_set_type(struct irq_data *d, unsigned int type) 588 { 589 struct gpio_chip *chip = irq_data_get_irq_chip_data(d); 590 struct armada_37xx_pinctrl *info = gpiochip_get_data(chip); 591 u32 val, reg = IRQ_POL; 592 unsigned long flags; 593 594 raw_spin_lock_irqsave(&info->irq_lock, flags); 595 armada_37xx_irq_update_reg(®, d); 596 val = readl(info->base + reg); 597 switch (type) { 598 case IRQ_TYPE_EDGE_RISING: 599 val &= ~(BIT(d->hwirq % GPIO_PER_REG)); 600 break; 601 case IRQ_TYPE_EDGE_FALLING: 602 val |= (BIT(d->hwirq % GPIO_PER_REG)); 603 break; 604 case IRQ_TYPE_EDGE_BOTH: { 605 u32 in_val, in_reg = INPUT_VAL; 606 607 armada_37xx_irq_update_reg(&in_reg, d); 608 regmap_read(info->regmap, in_reg, &in_val); 609 610 /* Set initial polarity based on current input level. */ 611 if (in_val & BIT(d->hwirq % GPIO_PER_REG)) 612 val |= BIT(d->hwirq % GPIO_PER_REG); /* falling */ 613 else 614 val &= ~(BIT(d->hwirq % GPIO_PER_REG)); /* rising */ 615 break; 616 } 617 default: 618 raw_spin_unlock_irqrestore(&info->irq_lock, flags); 619 return -EINVAL; 620 } 621 writel(val, info->base + reg); 622 raw_spin_unlock_irqrestore(&info->irq_lock, flags); 623 624 return 0; 625 } 626 627 static int armada_37xx_edge_both_irq_swap_pol(struct armada_37xx_pinctrl *info, 628 u32 pin_idx) 629 { 630 u32 reg_idx = pin_idx / GPIO_PER_REG; 631 u32 bit_num = pin_idx % GPIO_PER_REG; 632 u32 p, l, ret; 633 unsigned long flags; 634 635 regmap_read(info->regmap, INPUT_VAL + 4*reg_idx, &l); 636 637 raw_spin_lock_irqsave(&info->irq_lock, flags); 638 p = readl(info->base + IRQ_POL + 4 * reg_idx); 639 if ((p ^ l) & (1 << bit_num)) { 640 /* 641 * For the gpios which are used for both-edge irqs, when their 642 * interrupts happen, their input levels are changed, 643 * yet their interrupt polarities are kept in old values, we 644 * should synchronize their interrupt polarities; for example, 645 * at first a gpio's input level is low and its interrupt 646 * polarity control is "Detect rising edge", then the gpio has 647 * a interrupt , its level turns to high, we should change its 648 * polarity control to "Detect falling edge" correspondingly. 649 */ 650 p ^= 1 << bit_num; 651 writel(p, info->base + IRQ_POL + 4 * reg_idx); 652 ret = 0; 653 } else { 654 /* Spurious irq */ 655 ret = -1; 656 } 657 658 raw_spin_unlock_irqrestore(&info->irq_lock, flags); 659 return ret; 660 } 661 662 static void armada_37xx_irq_handler(struct irq_desc *desc) 663 { 664 struct gpio_chip *gc = irq_desc_get_handler_data(desc); 665 struct irq_chip *chip = irq_desc_get_chip(desc); 666 struct armada_37xx_pinctrl *info = gpiochip_get_data(gc); 667 struct irq_domain *d = gc->irq.domain; 668 int i; 669 670 chained_irq_enter(chip, desc); 671 for (i = 0; i <= d->revmap_size / GPIO_PER_REG; i++) { 672 u32 status; 673 unsigned long flags; 674 675 raw_spin_lock_irqsave(&info->irq_lock, flags); 676 status = readl_relaxed(info->base + IRQ_STATUS + 4 * i); 677 /* Manage only the interrupt that was enabled */ 678 status &= readl_relaxed(info->base + IRQ_EN + 4 * i); 679 raw_spin_unlock_irqrestore(&info->irq_lock, flags); 680 while (status) { 681 u32 hwirq = ffs(status) - 1; 682 u32 virq = irq_find_mapping(d, hwirq + 683 i * GPIO_PER_REG); 684 u32 t = irq_get_trigger_type(virq); 685 686 if ((t & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH) { 687 /* Swap polarity (race with GPIO line) */ 688 if (armada_37xx_edge_both_irq_swap_pol(info, 689 hwirq + i * GPIO_PER_REG)) { 690 /* 691 * For spurious irq, which gpio level 692 * is not as expected after incoming 693 * edge, just ack the gpio irq. 694 */ 695 writel(1 << hwirq, 696 info->base + 697 IRQ_STATUS + 4 * i); 698 goto update_status; 699 } 700 } 701 702 generic_handle_irq(virq); 703 704 update_status: 705 /* Update status in case a new IRQ appears */ 706 raw_spin_lock_irqsave(&info->irq_lock, flags); 707 status = readl_relaxed(info->base + 708 IRQ_STATUS + 4 * i); 709 /* Manage only the interrupt that was enabled */ 710 status &= readl_relaxed(info->base + IRQ_EN + 4 * i); 711 raw_spin_unlock_irqrestore(&info->irq_lock, flags); 712 } 713 } 714 chained_irq_exit(chip, desc); 715 } 716 717 static unsigned int armada_37xx_irq_startup(struct irq_data *d) 718 { 719 /* 720 * The mask field is a "precomputed bitmask for accessing the 721 * chip registers" which was introduced for the generic 722 * irqchip framework. As we don't use this framework, we can 723 * reuse this field for our own usage. 724 */ 725 d->mask = BIT(d->hwirq % GPIO_PER_REG); 726 727 armada_37xx_irq_unmask(d); 728 729 return 0; 730 } 731 732 static void armada_37xx_irq_print_chip(struct irq_data *d, struct seq_file *p) 733 { 734 struct gpio_chip *chip = irq_data_get_irq_chip_data(d); 735 struct armada_37xx_pinctrl *info = gpiochip_get_data(chip); 736 737 seq_printf(p, info->data->name); 738 } 739 740 static const struct irq_chip armada_37xx_irqchip = { 741 .irq_ack = armada_37xx_irq_ack, 742 .irq_mask = armada_37xx_irq_mask, 743 .irq_unmask = armada_37xx_irq_unmask, 744 .irq_set_wake = armada_37xx_irq_set_wake, 745 .irq_set_type = armada_37xx_irq_set_type, 746 .irq_startup = armada_37xx_irq_startup, 747 .irq_print_chip = armada_37xx_irq_print_chip, 748 .flags = IRQCHIP_IMMUTABLE, 749 GPIOCHIP_IRQ_RESOURCE_HELPERS, 750 }; 751 752 static int armada_37xx_irqchip_register(struct platform_device *pdev, 753 struct armada_37xx_pinctrl *info) 754 { 755 struct gpio_chip *gc = &info->gpio_chip; 756 struct gpio_irq_chip *girq = &gc->irq; 757 struct device_node *np = to_of_node(gc->fwnode); 758 struct device *dev = &pdev->dev; 759 unsigned int i, nr_irq_parent; 760 761 raw_spin_lock_init(&info->irq_lock); 762 763 nr_irq_parent = of_irq_count(np); 764 if (!nr_irq_parent) { 765 dev_err(dev, "invalid or no IRQ\n"); 766 return 0; 767 } 768 769 info->base = devm_platform_ioremap_resource(pdev, 1); 770 if (IS_ERR(info->base)) 771 return PTR_ERR(info->base); 772 773 gpio_irq_chip_set_chip(girq, &armada_37xx_irqchip); 774 girq->parent_handler = armada_37xx_irq_handler; 775 /* 776 * Many interrupts are connected to the parent interrupt 777 * controller. But we do not take advantage of this and use 778 * the chained irq with all of them. 779 */ 780 girq->num_parents = nr_irq_parent; 781 girq->parents = devm_kcalloc(dev, nr_irq_parent, sizeof(*girq->parents), GFP_KERNEL); 782 if (!girq->parents) 783 return -ENOMEM; 784 for (i = 0; i < nr_irq_parent; i++) { 785 int irq = irq_of_parse_and_map(np, i); 786 787 if (!irq) 788 continue; 789 girq->parents[i] = irq; 790 } 791 girq->default_type = IRQ_TYPE_NONE; 792 girq->handler = handle_edge_irq; 793 794 return 0; 795 } 796 797 static int armada_37xx_gpiochip_register(struct platform_device *pdev, 798 struct armada_37xx_pinctrl *info) 799 { 800 struct device *dev = &pdev->dev; 801 struct fwnode_handle *fwnode; 802 struct gpio_chip *gc; 803 int ret; 804 805 fwnode = gpiochip_node_get_first(dev); 806 if (!fwnode) 807 return -ENODEV; 808 809 info->gpio_chip = armada_37xx_gpiolib_chip; 810 811 gc = &info->gpio_chip; 812 gc->ngpio = info->data->nr_pins; 813 gc->parent = dev; 814 gc->base = -1; 815 gc->fwnode = fwnode; 816 gc->label = info->data->name; 817 818 ret = armada_37xx_irqchip_register(pdev, info); 819 if (ret) 820 return ret; 821 822 return devm_gpiochip_add_data(dev, gc, info); 823 } 824 825 /** 826 * armada_37xx_add_function() - Add a new function to the list 827 * @funcs: array of function to add the new one 828 * @funcsize: size of the remaining space for the function 829 * @name: name of the function to add 830 * 831 * If it is a new function then create it by adding its name else 832 * increment the number of group associated to this function. 833 */ 834 static int armada_37xx_add_function(struct armada_37xx_pmx_func *funcs, 835 int *funcsize, const char *name) 836 { 837 int i = 0; 838 839 if (*funcsize <= 0) 840 return -EOVERFLOW; 841 842 while (funcs->ngroups) { 843 /* function already there */ 844 if (strcmp(funcs->name, name) == 0) { 845 funcs->ngroups++; 846 847 return -EEXIST; 848 } 849 funcs++; 850 i++; 851 } 852 853 /* append new unique function */ 854 funcs->name = name; 855 funcs->ngroups = 1; 856 (*funcsize)--; 857 858 return 0; 859 } 860 861 /** 862 * armada_37xx_fill_group() - complete the group array 863 * @info: info driver instance 864 * 865 * Based on the data available from the armada_37xx_pin_group array 866 * completes the last member of the struct for each function: the list 867 * of the groups associated to this function. 868 * 869 */ 870 static int armada_37xx_fill_group(struct armada_37xx_pinctrl *info) 871 { 872 int n, num = 0, funcsize = info->data->nr_pins; 873 struct device *dev = info->dev; 874 875 for (n = 0; n < info->ngroups; n++) { 876 struct armada_37xx_pin_group *grp = &info->groups[n]; 877 int i, j, f; 878 879 grp->pins = devm_kcalloc(dev, grp->npins + grp->extra_npins, 880 sizeof(*grp->pins), 881 GFP_KERNEL); 882 if (!grp->pins) 883 return -ENOMEM; 884 885 for (i = 0; i < grp->npins; i++) 886 grp->pins[i] = grp->start_pin + i; 887 888 for (j = 0; j < grp->extra_npins; j++) 889 grp->pins[i+j] = grp->extra_pin + j; 890 891 for (f = 0; (f < NB_FUNCS) && grp->funcs[f]; f++) { 892 int ret; 893 /* check for unique functions and count groups */ 894 ret = armada_37xx_add_function(info->funcs, &funcsize, 895 grp->funcs[f]); 896 if (ret == -EOVERFLOW) 897 dev_err(dev, "More functions than pins(%d)\n", 898 info->data->nr_pins); 899 if (ret < 0) 900 continue; 901 num++; 902 } 903 } 904 905 info->nfuncs = num; 906 907 return 0; 908 } 909 910 /** 911 * armada_37xx_fill_func() - complete the funcs array 912 * @info: info driver instance 913 * 914 * Based on the data available from the armada_37xx_pin_group array 915 * completes the last two member of the struct for each group: 916 * - the list of the pins included in the group 917 * - the list of pinmux functions that can be selected for this group 918 * 919 */ 920 static int armada_37xx_fill_func(struct armada_37xx_pinctrl *info) 921 { 922 struct armada_37xx_pmx_func *funcs = info->funcs; 923 struct device *dev = info->dev; 924 int n; 925 926 for (n = 0; n < info->nfuncs; n++) { 927 const char *name = funcs[n].name; 928 const char **groups; 929 int g; 930 931 funcs[n].groups = devm_kcalloc(dev, funcs[n].ngroups, 932 sizeof(*(funcs[n].groups)), 933 GFP_KERNEL); 934 if (!funcs[n].groups) 935 return -ENOMEM; 936 937 groups = funcs[n].groups; 938 939 for (g = 0; g < info->ngroups; g++) { 940 struct armada_37xx_pin_group *gp = &info->groups[g]; 941 int f; 942 943 f = match_string(gp->funcs, NB_FUNCS, name); 944 if (f < 0) 945 continue; 946 947 *groups = gp->name; 948 groups++; 949 } 950 } 951 return 0; 952 } 953 954 static int armada_37xx_pinctrl_register(struct platform_device *pdev, 955 struct armada_37xx_pinctrl *info) 956 { 957 const struct armada_37xx_pin_data *pin_data = info->data; 958 struct pinctrl_desc *ctrldesc = &info->pctl; 959 struct pinctrl_pin_desc *pindesc, *pdesc; 960 struct device *dev = &pdev->dev; 961 char **pin_names; 962 int pin, ret; 963 964 info->groups = pin_data->groups; 965 info->ngroups = pin_data->ngroups; 966 967 ctrldesc->name = "armada_37xx-pinctrl"; 968 ctrldesc->owner = THIS_MODULE; 969 ctrldesc->pctlops = &armada_37xx_pctrl_ops; 970 ctrldesc->pmxops = &armada_37xx_pmx_ops; 971 ctrldesc->confops = &armada_37xx_pinconf_ops; 972 973 pindesc = devm_kcalloc(dev, pin_data->nr_pins, sizeof(*pindesc), GFP_KERNEL); 974 if (!pindesc) 975 return -ENOMEM; 976 977 ctrldesc->pins = pindesc; 978 ctrldesc->npins = pin_data->nr_pins; 979 980 pin_names = devm_kasprintf_strarray(dev, pin_data->name, pin_data->nr_pins); 981 if (IS_ERR(pin_names)) 982 return PTR_ERR(pin_names); 983 984 pdesc = pindesc; 985 for (pin = 0; pin < pin_data->nr_pins; pin++) { 986 pdesc->number = pin; 987 pdesc->name = pin_names[pin]; 988 pdesc++; 989 } 990 991 /* 992 * we allocate functions for number of pins and hope there are 993 * fewer unique functions than pins available 994 */ 995 info->funcs = devm_kcalloc(dev, pin_data->nr_pins, sizeof(*info->funcs), GFP_KERNEL); 996 if (!info->funcs) 997 return -ENOMEM; 998 999 ret = armada_37xx_fill_group(info); 1000 if (ret) 1001 return ret; 1002 1003 ret = armada_37xx_fill_func(info); 1004 if (ret) 1005 return ret; 1006 1007 info->pctl_dev = devm_pinctrl_register(dev, ctrldesc, info); 1008 if (IS_ERR(info->pctl_dev)) 1009 return dev_err_probe(dev, PTR_ERR(info->pctl_dev), "could not register pinctrl driver\n"); 1010 1011 return 0; 1012 } 1013 1014 #if defined(CONFIG_PM) 1015 static int armada_3700_pinctrl_suspend(struct device *dev) 1016 { 1017 struct armada_37xx_pinctrl *info = dev_get_drvdata(dev); 1018 1019 /* Save GPIO state */ 1020 regmap_read(info->regmap, OUTPUT_EN, &info->pm.out_en_l); 1021 regmap_read(info->regmap, OUTPUT_EN + sizeof(u32), &info->pm.out_en_h); 1022 regmap_read(info->regmap, OUTPUT_VAL, &info->pm.out_val_l); 1023 regmap_read(info->regmap, OUTPUT_VAL + sizeof(u32), 1024 &info->pm.out_val_h); 1025 1026 info->pm.irq_en_l = readl(info->base + IRQ_EN); 1027 info->pm.irq_en_h = readl(info->base + IRQ_EN + sizeof(u32)); 1028 info->pm.irq_pol_l = readl(info->base + IRQ_POL); 1029 info->pm.irq_pol_h = readl(info->base + IRQ_POL + sizeof(u32)); 1030 1031 /* Save pinctrl state */ 1032 regmap_read(info->regmap, SELECTION, &info->pm.selection); 1033 1034 return 0; 1035 } 1036 1037 static int armada_3700_pinctrl_resume(struct device *dev) 1038 { 1039 struct armada_37xx_pinctrl *info = dev_get_drvdata(dev); 1040 struct gpio_chip *gc; 1041 struct irq_domain *d; 1042 int i; 1043 1044 /* Restore GPIO state */ 1045 regmap_write(info->regmap, OUTPUT_EN, info->pm.out_en_l); 1046 regmap_write(info->regmap, OUTPUT_EN + sizeof(u32), 1047 info->pm.out_en_h); 1048 regmap_write(info->regmap, OUTPUT_VAL, info->pm.out_val_l); 1049 regmap_write(info->regmap, OUTPUT_VAL + sizeof(u32), 1050 info->pm.out_val_h); 1051 1052 /* 1053 * Input levels may change during suspend, which is not monitored at 1054 * that time. GPIOs used for both-edge IRQs may not be synchronized 1055 * anymore with their polarities (rising/falling edge) and must be 1056 * re-configured manually. 1057 */ 1058 gc = &info->gpio_chip; 1059 d = gc->irq.domain; 1060 for (i = 0; i < gc->ngpio; i++) { 1061 u32 irq_bit = BIT(i % GPIO_PER_REG); 1062 u32 mask, *irq_pol, input_reg, virq, type, level; 1063 1064 if (i < GPIO_PER_REG) { 1065 mask = info->pm.irq_en_l; 1066 irq_pol = &info->pm.irq_pol_l; 1067 input_reg = INPUT_VAL; 1068 } else { 1069 mask = info->pm.irq_en_h; 1070 irq_pol = &info->pm.irq_pol_h; 1071 input_reg = INPUT_VAL + sizeof(u32); 1072 } 1073 1074 if (!(mask & irq_bit)) 1075 continue; 1076 1077 virq = irq_find_mapping(d, i); 1078 type = irq_get_trigger_type(virq); 1079 1080 /* 1081 * Synchronize level and polarity for both-edge irqs: 1082 * - a high input level expects a falling edge, 1083 * - a low input level exepects a rising edge. 1084 */ 1085 if ((type & IRQ_TYPE_SENSE_MASK) == 1086 IRQ_TYPE_EDGE_BOTH) { 1087 regmap_read(info->regmap, input_reg, &level); 1088 if ((*irq_pol ^ level) & irq_bit) 1089 *irq_pol ^= irq_bit; 1090 } 1091 } 1092 1093 writel(info->pm.irq_en_l, info->base + IRQ_EN); 1094 writel(info->pm.irq_en_h, info->base + IRQ_EN + sizeof(u32)); 1095 writel(info->pm.irq_pol_l, info->base + IRQ_POL); 1096 writel(info->pm.irq_pol_h, info->base + IRQ_POL + sizeof(u32)); 1097 1098 /* Restore pinctrl state */ 1099 regmap_write(info->regmap, SELECTION, info->pm.selection); 1100 1101 return 0; 1102 } 1103 1104 /* 1105 * Since pinctrl is an infrastructure module, its resume should be issued prior 1106 * to other IO drivers. 1107 */ 1108 static const struct dev_pm_ops armada_3700_pinctrl_pm_ops = { 1109 .suspend_noirq = armada_3700_pinctrl_suspend, 1110 .resume_noirq = armada_3700_pinctrl_resume, 1111 }; 1112 1113 #define PINCTRL_ARMADA_37XX_DEV_PM_OPS (&armada_3700_pinctrl_pm_ops) 1114 #else 1115 #define PINCTRL_ARMADA_37XX_DEV_PM_OPS NULL 1116 #endif /* CONFIG_PM */ 1117 1118 static const struct of_device_id armada_37xx_pinctrl_of_match[] = { 1119 { 1120 .compatible = "marvell,armada3710-sb-pinctrl", 1121 .data = &armada_37xx_pin_sb, 1122 }, 1123 { 1124 .compatible = "marvell,armada3710-nb-pinctrl", 1125 .data = &armada_37xx_pin_nb, 1126 }, 1127 { }, 1128 }; 1129 1130 static const struct regmap_config armada_37xx_pinctrl_regmap_config = { 1131 .reg_bits = 32, 1132 .val_bits = 32, 1133 .reg_stride = 4, 1134 .use_raw_spinlock = true, 1135 }; 1136 1137 static int __init armada_37xx_pinctrl_probe(struct platform_device *pdev) 1138 { 1139 struct armada_37xx_pinctrl *info; 1140 struct device *dev = &pdev->dev; 1141 struct regmap *regmap; 1142 void __iomem *base; 1143 int ret; 1144 1145 base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL); 1146 if (IS_ERR(base)) { 1147 dev_err(dev, "failed to ioremap base address: %pe\n", base); 1148 return PTR_ERR(base); 1149 } 1150 1151 regmap = devm_regmap_init_mmio(dev, base, 1152 &armada_37xx_pinctrl_regmap_config); 1153 if (IS_ERR(regmap)) { 1154 dev_err(dev, "failed to create regmap: %pe\n", regmap); 1155 return PTR_ERR(regmap); 1156 } 1157 1158 info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL); 1159 if (!info) 1160 return -ENOMEM; 1161 1162 info->dev = dev; 1163 info->regmap = regmap; 1164 info->data = of_device_get_match_data(dev); 1165 1166 ret = armada_37xx_pinctrl_register(pdev, info); 1167 if (ret) 1168 return ret; 1169 1170 ret = armada_37xx_gpiochip_register(pdev, info); 1171 if (ret) 1172 return ret; 1173 1174 platform_set_drvdata(pdev, info); 1175 1176 return 0; 1177 } 1178 1179 static struct platform_driver armada_37xx_pinctrl_driver = { 1180 .driver = { 1181 .name = "armada-37xx-pinctrl", 1182 .of_match_table = armada_37xx_pinctrl_of_match, 1183 .pm = PINCTRL_ARMADA_37XX_DEV_PM_OPS, 1184 }, 1185 }; 1186 1187 builtin_platform_driver_probe(armada_37xx_pinctrl_driver, 1188 armada_37xx_pinctrl_probe); 1189