1 /* 2 * Copyright (c) 2013, Sony Mobile Communications AB. 3 * Copyright (c) 2013, The Linux Foundation. All rights reserved. 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 and 7 * only version 2 as published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 */ 14 15 #include <linux/delay.h> 16 #include <linux/err.h> 17 #include <linux/io.h> 18 #include <linux/module.h> 19 #include <linux/of.h> 20 #include <linux/platform_device.h> 21 #include <linux/pinctrl/machine.h> 22 #include <linux/pinctrl/pinctrl.h> 23 #include <linux/pinctrl/pinmux.h> 24 #include <linux/pinctrl/pinconf.h> 25 #include <linux/pinctrl/pinconf-generic.h> 26 #include <linux/slab.h> 27 #include <linux/gpio.h> 28 #include <linux/interrupt.h> 29 #include <linux/spinlock.h> 30 #include <linux/reboot.h> 31 #include <linux/pm.h> 32 #include <linux/log2.h> 33 34 #include "../core.h" 35 #include "../pinconf.h" 36 #include "pinctrl-msm.h" 37 #include "../pinctrl-utils.h" 38 39 #define MAX_NR_GPIO 300 40 #define PS_HOLD_OFFSET 0x820 41 42 /** 43 * struct msm_pinctrl - state for a pinctrl-msm device 44 * @dev: device handle. 45 * @pctrl: pinctrl handle. 46 * @chip: gpiochip handle. 47 * @restart_nb: restart notifier block. 48 * @irq: parent irq for the TLMM irq_chip. 49 * @lock: Spinlock to protect register resources as well 50 * as msm_pinctrl data structures. 51 * @enabled_irqs: Bitmap of currently enabled irqs. 52 * @dual_edge_irqs: Bitmap of irqs that need sw emulated dual edge 53 * detection. 54 * @soc; Reference to soc_data of platform specific data. 55 * @regs: Base address for the TLMM register map. 56 */ 57 struct msm_pinctrl { 58 struct device *dev; 59 struct pinctrl_dev *pctrl; 60 struct gpio_chip chip; 61 struct notifier_block restart_nb; 62 int irq; 63 64 spinlock_t lock; 65 66 DECLARE_BITMAP(dual_edge_irqs, MAX_NR_GPIO); 67 DECLARE_BITMAP(enabled_irqs, MAX_NR_GPIO); 68 69 const struct msm_pinctrl_soc_data *soc; 70 void __iomem *regs; 71 }; 72 73 static int msm_get_groups_count(struct pinctrl_dev *pctldev) 74 { 75 struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); 76 77 return pctrl->soc->ngroups; 78 } 79 80 static const char *msm_get_group_name(struct pinctrl_dev *pctldev, 81 unsigned group) 82 { 83 struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); 84 85 return pctrl->soc->groups[group].name; 86 } 87 88 static int msm_get_group_pins(struct pinctrl_dev *pctldev, 89 unsigned group, 90 const unsigned **pins, 91 unsigned *num_pins) 92 { 93 struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); 94 95 *pins = pctrl->soc->groups[group].pins; 96 *num_pins = pctrl->soc->groups[group].npins; 97 return 0; 98 } 99 100 static const struct pinctrl_ops msm_pinctrl_ops = { 101 .get_groups_count = msm_get_groups_count, 102 .get_group_name = msm_get_group_name, 103 .get_group_pins = msm_get_group_pins, 104 .dt_node_to_map = pinconf_generic_dt_node_to_map_group, 105 .dt_free_map = pinctrl_utils_free_map, 106 }; 107 108 static int msm_get_functions_count(struct pinctrl_dev *pctldev) 109 { 110 struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); 111 112 return pctrl->soc->nfunctions; 113 } 114 115 static const char *msm_get_function_name(struct pinctrl_dev *pctldev, 116 unsigned function) 117 { 118 struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); 119 120 return pctrl->soc->functions[function].name; 121 } 122 123 static int msm_get_function_groups(struct pinctrl_dev *pctldev, 124 unsigned function, 125 const char * const **groups, 126 unsigned * const num_groups) 127 { 128 struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); 129 130 *groups = pctrl->soc->functions[function].groups; 131 *num_groups = pctrl->soc->functions[function].ngroups; 132 return 0; 133 } 134 135 static int msm_pinmux_set_mux(struct pinctrl_dev *pctldev, 136 unsigned function, 137 unsigned group) 138 { 139 struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); 140 const struct msm_pingroup *g; 141 unsigned long flags; 142 u32 val, mask; 143 int i; 144 145 g = &pctrl->soc->groups[group]; 146 mask = GENMASK(g->mux_bit + order_base_2(g->nfuncs) - 1, g->mux_bit); 147 148 for (i = 0; i < g->nfuncs; i++) { 149 if (g->funcs[i] == function) 150 break; 151 } 152 153 if (WARN_ON(i == g->nfuncs)) 154 return -EINVAL; 155 156 spin_lock_irqsave(&pctrl->lock, flags); 157 158 val = readl(pctrl->regs + g->ctl_reg); 159 val &= ~mask; 160 val |= i << g->mux_bit; 161 writel(val, pctrl->regs + g->ctl_reg); 162 163 spin_unlock_irqrestore(&pctrl->lock, flags); 164 165 return 0; 166 } 167 168 static const struct pinmux_ops msm_pinmux_ops = { 169 .get_functions_count = msm_get_functions_count, 170 .get_function_name = msm_get_function_name, 171 .get_function_groups = msm_get_function_groups, 172 .set_mux = msm_pinmux_set_mux, 173 }; 174 175 static int msm_config_reg(struct msm_pinctrl *pctrl, 176 const struct msm_pingroup *g, 177 unsigned param, 178 unsigned *mask, 179 unsigned *bit) 180 { 181 switch (param) { 182 case PIN_CONFIG_BIAS_DISABLE: 183 case PIN_CONFIG_BIAS_PULL_DOWN: 184 case PIN_CONFIG_BIAS_BUS_HOLD: 185 case PIN_CONFIG_BIAS_PULL_UP: 186 *bit = g->pull_bit; 187 *mask = 3; 188 break; 189 case PIN_CONFIG_DRIVE_STRENGTH: 190 *bit = g->drv_bit; 191 *mask = 7; 192 break; 193 case PIN_CONFIG_OUTPUT: 194 case PIN_CONFIG_INPUT_ENABLE: 195 *bit = g->oe_bit; 196 *mask = 1; 197 break; 198 default: 199 return -ENOTSUPP; 200 } 201 202 return 0; 203 } 204 205 #define MSM_NO_PULL 0 206 #define MSM_PULL_DOWN 1 207 #define MSM_KEEPER 2 208 #define MSM_PULL_UP 3 209 210 static unsigned msm_regval_to_drive(u32 val) 211 { 212 return (val + 1) * 2; 213 } 214 215 static int msm_config_group_get(struct pinctrl_dev *pctldev, 216 unsigned int group, 217 unsigned long *config) 218 { 219 const struct msm_pingroup *g; 220 struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); 221 unsigned param = pinconf_to_config_param(*config); 222 unsigned mask; 223 unsigned arg; 224 unsigned bit; 225 int ret; 226 u32 val; 227 228 g = &pctrl->soc->groups[group]; 229 230 ret = msm_config_reg(pctrl, g, param, &mask, &bit); 231 if (ret < 0) 232 return ret; 233 234 val = readl(pctrl->regs + g->ctl_reg); 235 arg = (val >> bit) & mask; 236 237 /* Convert register value to pinconf value */ 238 switch (param) { 239 case PIN_CONFIG_BIAS_DISABLE: 240 arg = arg == MSM_NO_PULL; 241 break; 242 case PIN_CONFIG_BIAS_PULL_DOWN: 243 arg = arg == MSM_PULL_DOWN; 244 break; 245 case PIN_CONFIG_BIAS_BUS_HOLD: 246 arg = arg == MSM_KEEPER; 247 break; 248 case PIN_CONFIG_BIAS_PULL_UP: 249 arg = arg == MSM_PULL_UP; 250 break; 251 case PIN_CONFIG_DRIVE_STRENGTH: 252 arg = msm_regval_to_drive(arg); 253 break; 254 case PIN_CONFIG_OUTPUT: 255 /* Pin is not output */ 256 if (!arg) 257 return -EINVAL; 258 259 val = readl(pctrl->regs + g->io_reg); 260 arg = !!(val & BIT(g->in_bit)); 261 break; 262 case PIN_CONFIG_INPUT_ENABLE: 263 /* Pin is output */ 264 if (arg) 265 return -EINVAL; 266 arg = 1; 267 break; 268 default: 269 return -ENOTSUPP; 270 } 271 272 *config = pinconf_to_config_packed(param, arg); 273 274 return 0; 275 } 276 277 static int msm_config_group_set(struct pinctrl_dev *pctldev, 278 unsigned group, 279 unsigned long *configs, 280 unsigned num_configs) 281 { 282 const struct msm_pingroup *g; 283 struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev); 284 unsigned long flags; 285 unsigned param; 286 unsigned mask; 287 unsigned arg; 288 unsigned bit; 289 int ret; 290 u32 val; 291 int i; 292 293 g = &pctrl->soc->groups[group]; 294 295 for (i = 0; i < num_configs; i++) { 296 param = pinconf_to_config_param(configs[i]); 297 arg = pinconf_to_config_argument(configs[i]); 298 299 ret = msm_config_reg(pctrl, g, param, &mask, &bit); 300 if (ret < 0) 301 return ret; 302 303 /* Convert pinconf values to register values */ 304 switch (param) { 305 case PIN_CONFIG_BIAS_DISABLE: 306 arg = MSM_NO_PULL; 307 break; 308 case PIN_CONFIG_BIAS_PULL_DOWN: 309 arg = MSM_PULL_DOWN; 310 break; 311 case PIN_CONFIG_BIAS_BUS_HOLD: 312 arg = MSM_KEEPER; 313 break; 314 case PIN_CONFIG_BIAS_PULL_UP: 315 arg = MSM_PULL_UP; 316 break; 317 case PIN_CONFIG_DRIVE_STRENGTH: 318 /* Check for invalid values */ 319 if (arg > 16 || arg < 2 || (arg % 2) != 0) 320 arg = -1; 321 else 322 arg = (arg / 2) - 1; 323 break; 324 case PIN_CONFIG_OUTPUT: 325 /* set output value */ 326 spin_lock_irqsave(&pctrl->lock, flags); 327 val = readl(pctrl->regs + g->io_reg); 328 if (arg) 329 val |= BIT(g->out_bit); 330 else 331 val &= ~BIT(g->out_bit); 332 writel(val, pctrl->regs + g->io_reg); 333 spin_unlock_irqrestore(&pctrl->lock, flags); 334 335 /* enable output */ 336 arg = 1; 337 break; 338 case PIN_CONFIG_INPUT_ENABLE: 339 /* disable output */ 340 arg = 0; 341 break; 342 default: 343 dev_err(pctrl->dev, "Unsupported config parameter: %x\n", 344 param); 345 return -EINVAL; 346 } 347 348 /* Range-check user-supplied value */ 349 if (arg & ~mask) { 350 dev_err(pctrl->dev, "config %x: %x is invalid\n", param, arg); 351 return -EINVAL; 352 } 353 354 spin_lock_irqsave(&pctrl->lock, flags); 355 val = readl(pctrl->regs + g->ctl_reg); 356 val &= ~(mask << bit); 357 val |= arg << bit; 358 writel(val, pctrl->regs + g->ctl_reg); 359 spin_unlock_irqrestore(&pctrl->lock, flags); 360 } 361 362 return 0; 363 } 364 365 static const struct pinconf_ops msm_pinconf_ops = { 366 .is_generic = true, 367 .pin_config_group_get = msm_config_group_get, 368 .pin_config_group_set = msm_config_group_set, 369 }; 370 371 static struct pinctrl_desc msm_pinctrl_desc = { 372 .pctlops = &msm_pinctrl_ops, 373 .pmxops = &msm_pinmux_ops, 374 .confops = &msm_pinconf_ops, 375 .owner = THIS_MODULE, 376 }; 377 378 static int msm_gpio_direction_input(struct gpio_chip *chip, unsigned offset) 379 { 380 const struct msm_pingroup *g; 381 struct msm_pinctrl *pctrl = gpiochip_get_data(chip); 382 unsigned long flags; 383 u32 val; 384 385 g = &pctrl->soc->groups[offset]; 386 387 spin_lock_irqsave(&pctrl->lock, flags); 388 389 val = readl(pctrl->regs + g->ctl_reg); 390 val &= ~BIT(g->oe_bit); 391 writel(val, pctrl->regs + g->ctl_reg); 392 393 spin_unlock_irqrestore(&pctrl->lock, flags); 394 395 return 0; 396 } 397 398 static int msm_gpio_direction_output(struct gpio_chip *chip, unsigned offset, int value) 399 { 400 const struct msm_pingroup *g; 401 struct msm_pinctrl *pctrl = gpiochip_get_data(chip); 402 unsigned long flags; 403 u32 val; 404 405 g = &pctrl->soc->groups[offset]; 406 407 spin_lock_irqsave(&pctrl->lock, flags); 408 409 val = readl(pctrl->regs + g->io_reg); 410 if (value) 411 val |= BIT(g->out_bit); 412 else 413 val &= ~BIT(g->out_bit); 414 writel(val, pctrl->regs + g->io_reg); 415 416 val = readl(pctrl->regs + g->ctl_reg); 417 val |= BIT(g->oe_bit); 418 writel(val, pctrl->regs + g->ctl_reg); 419 420 spin_unlock_irqrestore(&pctrl->lock, flags); 421 422 return 0; 423 } 424 425 static int msm_gpio_get(struct gpio_chip *chip, unsigned offset) 426 { 427 const struct msm_pingroup *g; 428 struct msm_pinctrl *pctrl = gpiochip_get_data(chip); 429 u32 val; 430 431 g = &pctrl->soc->groups[offset]; 432 433 val = readl(pctrl->regs + g->io_reg); 434 return !!(val & BIT(g->in_bit)); 435 } 436 437 static void msm_gpio_set(struct gpio_chip *chip, unsigned offset, int value) 438 { 439 const struct msm_pingroup *g; 440 struct msm_pinctrl *pctrl = gpiochip_get_data(chip); 441 unsigned long flags; 442 u32 val; 443 444 g = &pctrl->soc->groups[offset]; 445 446 spin_lock_irqsave(&pctrl->lock, flags); 447 448 val = readl(pctrl->regs + g->io_reg); 449 if (value) 450 val |= BIT(g->out_bit); 451 else 452 val &= ~BIT(g->out_bit); 453 writel(val, pctrl->regs + g->io_reg); 454 455 spin_unlock_irqrestore(&pctrl->lock, flags); 456 } 457 458 #ifdef CONFIG_DEBUG_FS 459 #include <linux/seq_file.h> 460 461 static void msm_gpio_dbg_show_one(struct seq_file *s, 462 struct pinctrl_dev *pctldev, 463 struct gpio_chip *chip, 464 unsigned offset, 465 unsigned gpio) 466 { 467 const struct msm_pingroup *g; 468 struct msm_pinctrl *pctrl = gpiochip_get_data(chip); 469 unsigned func; 470 int is_out; 471 int drive; 472 int pull; 473 u32 ctl_reg; 474 475 static const char * const pulls[] = { 476 "no pull", 477 "pull down", 478 "keeper", 479 "pull up" 480 }; 481 482 g = &pctrl->soc->groups[offset]; 483 ctl_reg = readl(pctrl->regs + g->ctl_reg); 484 485 is_out = !!(ctl_reg & BIT(g->oe_bit)); 486 func = (ctl_reg >> g->mux_bit) & 7; 487 drive = (ctl_reg >> g->drv_bit) & 7; 488 pull = (ctl_reg >> g->pull_bit) & 3; 489 490 seq_printf(s, " %-8s: %-3s %d", g->name, is_out ? "out" : "in", func); 491 seq_printf(s, " %dmA", msm_regval_to_drive(drive)); 492 seq_printf(s, " %s", pulls[pull]); 493 } 494 495 static void msm_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip) 496 { 497 unsigned gpio = chip->base; 498 unsigned i; 499 500 for (i = 0; i < chip->ngpio; i++, gpio++) { 501 msm_gpio_dbg_show_one(s, NULL, chip, i, gpio); 502 seq_puts(s, "\n"); 503 } 504 } 505 506 #else 507 #define msm_gpio_dbg_show NULL 508 #endif 509 510 static struct gpio_chip msm_gpio_template = { 511 .direction_input = msm_gpio_direction_input, 512 .direction_output = msm_gpio_direction_output, 513 .get = msm_gpio_get, 514 .set = msm_gpio_set, 515 .request = gpiochip_generic_request, 516 .free = gpiochip_generic_free, 517 .dbg_show = msm_gpio_dbg_show, 518 }; 519 520 /* For dual-edge interrupts in software, since some hardware has no 521 * such support: 522 * 523 * At appropriate moments, this function may be called to flip the polarity 524 * settings of both-edge irq lines to try and catch the next edge. 525 * 526 * The attempt is considered successful if: 527 * - the status bit goes high, indicating that an edge was caught, or 528 * - the input value of the gpio doesn't change during the attempt. 529 * If the value changes twice during the process, that would cause the first 530 * test to fail but would force the second, as two opposite 531 * transitions would cause a detection no matter the polarity setting. 532 * 533 * The do-loop tries to sledge-hammer closed the timing hole between 534 * the initial value-read and the polarity-write - if the line value changes 535 * during that window, an interrupt is lost, the new polarity setting is 536 * incorrect, and the first success test will fail, causing a retry. 537 * 538 * Algorithm comes from Google's msmgpio driver. 539 */ 540 static void msm_gpio_update_dual_edge_pos(struct msm_pinctrl *pctrl, 541 const struct msm_pingroup *g, 542 struct irq_data *d) 543 { 544 int loop_limit = 100; 545 unsigned val, val2, intstat; 546 unsigned pol; 547 548 do { 549 val = readl(pctrl->regs + g->io_reg) & BIT(g->in_bit); 550 551 pol = readl(pctrl->regs + g->intr_cfg_reg); 552 pol ^= BIT(g->intr_polarity_bit); 553 writel(pol, pctrl->regs + g->intr_cfg_reg); 554 555 val2 = readl(pctrl->regs + g->io_reg) & BIT(g->in_bit); 556 intstat = readl(pctrl->regs + g->intr_status_reg); 557 if (intstat || (val == val2)) 558 return; 559 } while (loop_limit-- > 0); 560 dev_err(pctrl->dev, "dual-edge irq failed to stabilize, %#08x != %#08x\n", 561 val, val2); 562 } 563 564 static void msm_gpio_irq_mask(struct irq_data *d) 565 { 566 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 567 struct msm_pinctrl *pctrl = gpiochip_get_data(gc); 568 const struct msm_pingroup *g; 569 unsigned long flags; 570 u32 val; 571 572 g = &pctrl->soc->groups[d->hwirq]; 573 574 spin_lock_irqsave(&pctrl->lock, flags); 575 576 val = readl(pctrl->regs + g->intr_cfg_reg); 577 val &= ~BIT(g->intr_enable_bit); 578 writel(val, pctrl->regs + g->intr_cfg_reg); 579 580 clear_bit(d->hwirq, pctrl->enabled_irqs); 581 582 spin_unlock_irqrestore(&pctrl->lock, flags); 583 } 584 585 static void msm_gpio_irq_unmask(struct irq_data *d) 586 { 587 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 588 struct msm_pinctrl *pctrl = gpiochip_get_data(gc); 589 const struct msm_pingroup *g; 590 unsigned long flags; 591 u32 val; 592 593 g = &pctrl->soc->groups[d->hwirq]; 594 595 spin_lock_irqsave(&pctrl->lock, flags); 596 597 val = readl(pctrl->regs + g->intr_status_reg); 598 val &= ~BIT(g->intr_status_bit); 599 writel(val, pctrl->regs + g->intr_status_reg); 600 601 val = readl(pctrl->regs + g->intr_cfg_reg); 602 val |= BIT(g->intr_enable_bit); 603 writel(val, pctrl->regs + g->intr_cfg_reg); 604 605 set_bit(d->hwirq, pctrl->enabled_irqs); 606 607 spin_unlock_irqrestore(&pctrl->lock, flags); 608 } 609 610 static void msm_gpio_irq_ack(struct irq_data *d) 611 { 612 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 613 struct msm_pinctrl *pctrl = gpiochip_get_data(gc); 614 const struct msm_pingroup *g; 615 unsigned long flags; 616 u32 val; 617 618 g = &pctrl->soc->groups[d->hwirq]; 619 620 spin_lock_irqsave(&pctrl->lock, flags); 621 622 val = readl(pctrl->regs + g->intr_status_reg); 623 if (g->intr_ack_high) 624 val |= BIT(g->intr_status_bit); 625 else 626 val &= ~BIT(g->intr_status_bit); 627 writel(val, pctrl->regs + g->intr_status_reg); 628 629 if (test_bit(d->hwirq, pctrl->dual_edge_irqs)) 630 msm_gpio_update_dual_edge_pos(pctrl, g, d); 631 632 spin_unlock_irqrestore(&pctrl->lock, flags); 633 } 634 635 static int msm_gpio_irq_set_type(struct irq_data *d, unsigned int type) 636 { 637 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 638 struct msm_pinctrl *pctrl = gpiochip_get_data(gc); 639 const struct msm_pingroup *g; 640 unsigned long flags; 641 u32 val; 642 643 g = &pctrl->soc->groups[d->hwirq]; 644 645 spin_lock_irqsave(&pctrl->lock, flags); 646 647 /* 648 * For hw without possibility of detecting both edges 649 */ 650 if (g->intr_detection_width == 1 && type == IRQ_TYPE_EDGE_BOTH) 651 set_bit(d->hwirq, pctrl->dual_edge_irqs); 652 else 653 clear_bit(d->hwirq, pctrl->dual_edge_irqs); 654 655 /* Route interrupts to application cpu */ 656 val = readl(pctrl->regs + g->intr_target_reg); 657 val &= ~(7 << g->intr_target_bit); 658 val |= g->intr_target_kpss_val << g->intr_target_bit; 659 writel(val, pctrl->regs + g->intr_target_reg); 660 661 /* Update configuration for gpio. 662 * RAW_STATUS_EN is left on for all gpio irqs. Due to the 663 * internal circuitry of TLMM, toggling the RAW_STATUS 664 * could cause the INTR_STATUS to be set for EDGE interrupts. 665 */ 666 val = readl(pctrl->regs + g->intr_cfg_reg); 667 val |= BIT(g->intr_raw_status_bit); 668 if (g->intr_detection_width == 2) { 669 val &= ~(3 << g->intr_detection_bit); 670 val &= ~(1 << g->intr_polarity_bit); 671 switch (type) { 672 case IRQ_TYPE_EDGE_RISING: 673 val |= 1 << g->intr_detection_bit; 674 val |= BIT(g->intr_polarity_bit); 675 break; 676 case IRQ_TYPE_EDGE_FALLING: 677 val |= 2 << g->intr_detection_bit; 678 val |= BIT(g->intr_polarity_bit); 679 break; 680 case IRQ_TYPE_EDGE_BOTH: 681 val |= 3 << g->intr_detection_bit; 682 val |= BIT(g->intr_polarity_bit); 683 break; 684 case IRQ_TYPE_LEVEL_LOW: 685 break; 686 case IRQ_TYPE_LEVEL_HIGH: 687 val |= BIT(g->intr_polarity_bit); 688 break; 689 } 690 } else if (g->intr_detection_width == 1) { 691 val &= ~(1 << g->intr_detection_bit); 692 val &= ~(1 << g->intr_polarity_bit); 693 switch (type) { 694 case IRQ_TYPE_EDGE_RISING: 695 val |= BIT(g->intr_detection_bit); 696 val |= BIT(g->intr_polarity_bit); 697 break; 698 case IRQ_TYPE_EDGE_FALLING: 699 val |= BIT(g->intr_detection_bit); 700 break; 701 case IRQ_TYPE_EDGE_BOTH: 702 val |= BIT(g->intr_detection_bit); 703 val |= BIT(g->intr_polarity_bit); 704 break; 705 case IRQ_TYPE_LEVEL_LOW: 706 break; 707 case IRQ_TYPE_LEVEL_HIGH: 708 val |= BIT(g->intr_polarity_bit); 709 break; 710 } 711 } else { 712 BUG(); 713 } 714 writel(val, pctrl->regs + g->intr_cfg_reg); 715 716 if (test_bit(d->hwirq, pctrl->dual_edge_irqs)) 717 msm_gpio_update_dual_edge_pos(pctrl, g, d); 718 719 spin_unlock_irqrestore(&pctrl->lock, flags); 720 721 if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH)) 722 irq_set_handler_locked(d, handle_level_irq); 723 else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING)) 724 irq_set_handler_locked(d, handle_edge_irq); 725 726 return 0; 727 } 728 729 static int msm_gpio_irq_set_wake(struct irq_data *d, unsigned int on) 730 { 731 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 732 struct msm_pinctrl *pctrl = gpiochip_get_data(gc); 733 unsigned long flags; 734 735 spin_lock_irqsave(&pctrl->lock, flags); 736 737 irq_set_irq_wake(pctrl->irq, on); 738 739 spin_unlock_irqrestore(&pctrl->lock, flags); 740 741 return 0; 742 } 743 744 static struct irq_chip msm_gpio_irq_chip = { 745 .name = "msmgpio", 746 .irq_mask = msm_gpio_irq_mask, 747 .irq_unmask = msm_gpio_irq_unmask, 748 .irq_ack = msm_gpio_irq_ack, 749 .irq_set_type = msm_gpio_irq_set_type, 750 .irq_set_wake = msm_gpio_irq_set_wake, 751 }; 752 753 static void msm_gpio_irq_handler(struct irq_desc *desc) 754 { 755 struct gpio_chip *gc = irq_desc_get_handler_data(desc); 756 const struct msm_pingroup *g; 757 struct msm_pinctrl *pctrl = gpiochip_get_data(gc); 758 struct irq_chip *chip = irq_desc_get_chip(desc); 759 int irq_pin; 760 int handled = 0; 761 u32 val; 762 int i; 763 764 chained_irq_enter(chip, desc); 765 766 /* 767 * Each pin has it's own IRQ status register, so use 768 * enabled_irq bitmap to limit the number of reads. 769 */ 770 for_each_set_bit(i, pctrl->enabled_irqs, pctrl->chip.ngpio) { 771 g = &pctrl->soc->groups[i]; 772 val = readl(pctrl->regs + g->intr_status_reg); 773 if (val & BIT(g->intr_status_bit)) { 774 irq_pin = irq_find_mapping(gc->irqdomain, i); 775 generic_handle_irq(irq_pin); 776 handled++; 777 } 778 } 779 780 /* No interrupts were flagged */ 781 if (handled == 0) 782 handle_bad_irq(desc); 783 784 chained_irq_exit(chip, desc); 785 } 786 787 static int msm_gpio_init(struct msm_pinctrl *pctrl) 788 { 789 struct gpio_chip *chip; 790 int ret; 791 unsigned ngpio = pctrl->soc->ngpios; 792 793 if (WARN_ON(ngpio > MAX_NR_GPIO)) 794 return -EINVAL; 795 796 chip = &pctrl->chip; 797 chip->base = 0; 798 chip->ngpio = ngpio; 799 chip->label = dev_name(pctrl->dev); 800 chip->parent = pctrl->dev; 801 chip->owner = THIS_MODULE; 802 chip->of_node = pctrl->dev->of_node; 803 804 ret = gpiochip_add_data(&pctrl->chip, pctrl); 805 if (ret) { 806 dev_err(pctrl->dev, "Failed register gpiochip\n"); 807 return ret; 808 } 809 810 ret = gpiochip_add_pin_range(&pctrl->chip, dev_name(pctrl->dev), 0, 0, chip->ngpio); 811 if (ret) { 812 dev_err(pctrl->dev, "Failed to add pin range\n"); 813 gpiochip_remove(&pctrl->chip); 814 return ret; 815 } 816 817 ret = gpiochip_irqchip_add(chip, 818 &msm_gpio_irq_chip, 819 0, 820 handle_edge_irq, 821 IRQ_TYPE_NONE); 822 if (ret) { 823 dev_err(pctrl->dev, "Failed to add irqchip to gpiochip\n"); 824 gpiochip_remove(&pctrl->chip); 825 return -ENOSYS; 826 } 827 828 gpiochip_set_chained_irqchip(chip, &msm_gpio_irq_chip, pctrl->irq, 829 msm_gpio_irq_handler); 830 831 return 0; 832 } 833 834 static int msm_ps_hold_restart(struct notifier_block *nb, unsigned long action, 835 void *data) 836 { 837 struct msm_pinctrl *pctrl = container_of(nb, struct msm_pinctrl, restart_nb); 838 839 writel(0, pctrl->regs + PS_HOLD_OFFSET); 840 mdelay(1000); 841 return NOTIFY_DONE; 842 } 843 844 static struct msm_pinctrl *poweroff_pctrl; 845 846 static void msm_ps_hold_poweroff(void) 847 { 848 msm_ps_hold_restart(&poweroff_pctrl->restart_nb, 0, NULL); 849 } 850 851 static void msm_pinctrl_setup_pm_reset(struct msm_pinctrl *pctrl) 852 { 853 int i; 854 const struct msm_function *func = pctrl->soc->functions; 855 856 for (i = 0; i < pctrl->soc->nfunctions; i++) 857 if (!strcmp(func[i].name, "ps_hold")) { 858 pctrl->restart_nb.notifier_call = msm_ps_hold_restart; 859 pctrl->restart_nb.priority = 128; 860 if (register_restart_handler(&pctrl->restart_nb)) 861 dev_err(pctrl->dev, 862 "failed to setup restart handler.\n"); 863 poweroff_pctrl = pctrl; 864 pm_power_off = msm_ps_hold_poweroff; 865 break; 866 } 867 } 868 869 int msm_pinctrl_probe(struct platform_device *pdev, 870 const struct msm_pinctrl_soc_data *soc_data) 871 { 872 struct msm_pinctrl *pctrl; 873 struct resource *res; 874 int ret; 875 876 pctrl = devm_kzalloc(&pdev->dev, sizeof(*pctrl), GFP_KERNEL); 877 if (!pctrl) { 878 dev_err(&pdev->dev, "Can't allocate msm_pinctrl\n"); 879 return -ENOMEM; 880 } 881 pctrl->dev = &pdev->dev; 882 pctrl->soc = soc_data; 883 pctrl->chip = msm_gpio_template; 884 885 spin_lock_init(&pctrl->lock); 886 887 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 888 pctrl->regs = devm_ioremap_resource(&pdev->dev, res); 889 if (IS_ERR(pctrl->regs)) 890 return PTR_ERR(pctrl->regs); 891 892 msm_pinctrl_setup_pm_reset(pctrl); 893 894 pctrl->irq = platform_get_irq(pdev, 0); 895 if (pctrl->irq < 0) { 896 dev_err(&pdev->dev, "No interrupt defined for msmgpio\n"); 897 return pctrl->irq; 898 } 899 900 msm_pinctrl_desc.name = dev_name(&pdev->dev); 901 msm_pinctrl_desc.pins = pctrl->soc->pins; 902 msm_pinctrl_desc.npins = pctrl->soc->npins; 903 pctrl->pctrl = devm_pinctrl_register(&pdev->dev, &msm_pinctrl_desc, 904 pctrl); 905 if (IS_ERR(pctrl->pctrl)) { 906 dev_err(&pdev->dev, "Couldn't register pinctrl driver\n"); 907 return PTR_ERR(pctrl->pctrl); 908 } 909 910 ret = msm_gpio_init(pctrl); 911 if (ret) 912 return ret; 913 914 platform_set_drvdata(pdev, pctrl); 915 916 dev_dbg(&pdev->dev, "Probed Qualcomm pinctrl driver\n"); 917 918 return 0; 919 } 920 EXPORT_SYMBOL(msm_pinctrl_probe); 921 922 int msm_pinctrl_remove(struct platform_device *pdev) 923 { 924 struct msm_pinctrl *pctrl = platform_get_drvdata(pdev); 925 926 gpiochip_remove(&pctrl->chip); 927 928 unregister_restart_handler(&pctrl->restart_nb); 929 930 return 0; 931 } 932 EXPORT_SYMBOL(msm_pinctrl_remove); 933 934