drivers/pinctrl/qcom/pinctrl-msm.c

   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
  32 #include "../core.h"
  33 #include "../pinconf.h"
  34 #include "pinctrl-msm.h"
  35 #include "../pinctrl-utils.h"
  36
  37 #define MAX_NR_GPIO 300
  38 #define PS_HOLD_OFFSET 0x820
  39
  40 /**
  41  * struct msm_pinctrl - state for a pinctrl-msm device
  42  * @dev:            device handle.
  43  * @pctrl:          pinctrl handle.
  44  * @chip:           gpiochip handle.
  45  * @restart_nb:     restart notifier block.
  46  * @irq:            parent irq for the TLMM irq_chip.
  47  * @lock:           Spinlock to protect register resources as well
  48  *                  as msm_pinctrl data structures.
  49  * @enabled_irqs:   Bitmap of currently enabled irqs.
  50  * @dual_edge_irqs: Bitmap of irqs that need sw emulated dual edge
  51  *                  detection.
  52  * @soc;            Reference to soc_data of platform specific data.
  53  * @regs:           Base address for the TLMM register map.
  54  */
  55 struct msm_pinctrl {
  56         struct device *dev;
  57         struct pinctrl_dev *pctrl;
  58         struct gpio_chip chip;
  59         struct notifier_block restart_nb;
  60         int irq;
  61
  62         spinlock_t lock;
  63
  64         DECLARE_BITMAP(dual_edge_irqs, MAX_NR_GPIO);
  65         DECLARE_BITMAP(enabled_irqs, MAX_NR_GPIO);
  66
  67         const struct msm_pinctrl_soc_data *soc;
  68         void __iomem *regs;
  69 };
  70
  71 static inline struct msm_pinctrl *to_msm_pinctrl(struct gpio_chip *gc)
  72 {
  73         return container_of(gc, struct msm_pinctrl, chip);
  74 }
  75
  76 static int msm_get_groups_count(struct pinctrl_dev *pctldev)
  77 {
  78         struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
  79
  80         return pctrl->soc->ngroups;
  81 }
  82
  83 static const char *msm_get_group_name(struct pinctrl_dev *pctldev,
  84                                       unsigned group)
  85 {
  86         struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
  87
  88         return pctrl->soc->groups[group].name;
  89 }
  90
  91 static int msm_get_group_pins(struct pinctrl_dev *pctldev,
  92                               unsigned group,
  93                               const unsigned **pins,
  94                               unsigned *num_pins)
  95 {
  96         struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
  97
  98         *pins = pctrl->soc->groups[group].pins;
  99         *num_pins = pctrl->soc->groups[group].npins;
 100         return 0;
 101 }
 102
 103 static const struct pinctrl_ops msm_pinctrl_ops = {
 104         .get_groups_count       = msm_get_groups_count,
 105         .get_group_name         = msm_get_group_name,
 106         .get_group_pins         = msm_get_group_pins,
 107         .dt_node_to_map         = pinconf_generic_dt_node_to_map_group,
 108         .dt_free_map            = pinctrl_utils_dt_free_map,
 109 };
 110
 111 static int msm_get_functions_count(struct pinctrl_dev *pctldev)
 112 {
 113         struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
 114
 115         return pctrl->soc->nfunctions;
 116 }
 117
 118 static const char *msm_get_function_name(struct pinctrl_dev *pctldev,
 119                                          unsigned function)
 120 {
 121         struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
 122
 123         return pctrl->soc->functions[function].name;
 124 }
 125
 126 static int msm_get_function_groups(struct pinctrl_dev *pctldev,
 127                                    unsigned function,
 128                                    const char * const **groups,
 129                                    unsigned * const num_groups)
 130 {
 131         struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
 132
 133         *groups = pctrl->soc->functions[function].groups;
 134         *num_groups = pctrl->soc->functions[function].ngroups;
 135         return 0;
 136 }
 137
 138 static int msm_pinmux_set_mux(struct pinctrl_dev *pctldev,
 139                               unsigned function,
 140                               unsigned group)
 141 {
 142         struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
 143         const struct msm_pingroup *g;
 144         unsigned long flags;
 145         u32 val;
 146         int i;
 147
 148         g = &pctrl->soc->groups[group];
 149
 150         for (i = 0; i < g->nfuncs; i++) {
 151                 if (g->funcs[i] == function)
 152                         break;
 153         }
 154
 155         if (WARN_ON(i == g->nfuncs))
 156                 return -EINVAL;
 157
 158         spin_lock_irqsave(&pctrl->lock, flags);
 159
 160         val = readl(pctrl->regs + g->ctl_reg);
 161         val &= ~(0x7 << g->mux_bit);
 162         val |= i << g->mux_bit;
 163         writel(val, pctrl->regs + g->ctl_reg);
 164
 165         spin_unlock_irqrestore(&pctrl->lock, flags);
 166
 167         return 0;
 168 }
 169
 170 static const struct pinmux_ops msm_pinmux_ops = {
 171         .get_functions_count    = msm_get_functions_count,
 172         .get_function_name      = msm_get_function_name,
 173         .get_function_groups    = msm_get_function_groups,
 174         .set_mux                = msm_pinmux_set_mux,
 175 };
 176
 177 static int msm_config_reg(struct msm_pinctrl *pctrl,
 178                           const struct msm_pingroup *g,
 179                           unsigned param,
 180                           unsigned *mask,
 181                           unsigned *bit)
 182 {
 183         switch (param) {
 184         case PIN_CONFIG_BIAS_DISABLE:
 185         case PIN_CONFIG_BIAS_PULL_DOWN:
 186         case PIN_CONFIG_BIAS_BUS_HOLD:
 187         case PIN_CONFIG_BIAS_PULL_UP:
 188                 *bit = g->pull_bit;
 189                 *mask = 3;
 190                 break;
 191         case PIN_CONFIG_DRIVE_STRENGTH:
 192                 *bit = g->drv_bit;
 193                 *mask = 7;
 194                 break;
 195         case PIN_CONFIG_OUTPUT:
 196                 *bit = g->oe_bit;
 197                 *mask = 1;
 198                 break;
 199         default:
 200                 dev_err(pctrl->dev, "Invalid config param %04x\n", param);
 201                 return -ENOTSUPP;
 202         }
 203
 204         return 0;
 205 }
 206
 207 #define MSM_NO_PULL     0
 208 #define MSM_PULL_DOWN   1
 209 #define MSM_KEEPER      2
 210 #define MSM_PULL_UP     3
 211
 212 static unsigned msm_regval_to_drive(u32 val)
 213 {
 214         return (val + 1) * 2;
 215 }
 216
 217 static int msm_config_group_get(struct pinctrl_dev *pctldev,
 218                                 unsigned int group,
 219                                 unsigned long *config)
 220 {
 221         const struct msm_pingroup *g;
 222         struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
 223         unsigned param = pinconf_to_config_param(*config);
 224         unsigned mask;
 225         unsigned arg;
 226         unsigned bit;
 227         int ret;
 228         u32 val;
 229
 230         g = &pctrl->soc->groups[group];
 231
 232         ret = msm_config_reg(pctrl, g, param, &mask, &bit);
 233         if (ret < 0)
 234                 return ret;
 235
 236         val = readl(pctrl->regs + g->ctl_reg);
 237         arg = (val >> bit) & mask;
 238
 239         /* Convert register value to pinconf value */
 240         switch (param) {
 241         case PIN_CONFIG_BIAS_DISABLE:
 242                 arg = arg == MSM_NO_PULL;
 243                 break;
 244         case PIN_CONFIG_BIAS_PULL_DOWN:
 245                 arg = arg == MSM_PULL_DOWN;
 246                 break;
 247         case PIN_CONFIG_BIAS_BUS_HOLD:
 248                 arg = arg == MSM_KEEPER;
 249                 break;
 250         case PIN_CONFIG_BIAS_PULL_UP:
 251                 arg = arg == MSM_PULL_UP;
 252                 break;
 253         case PIN_CONFIG_DRIVE_STRENGTH:
 254                 arg = msm_regval_to_drive(arg);
 255                 break;
 256         case PIN_CONFIG_OUTPUT:
 257                 /* Pin is not output */
 258                 if (!arg)
 259                         return -EINVAL;
 260
 261                 val = readl(pctrl->regs + g->io_reg);
 262                 arg = !!(val & BIT(g->in_bit));
 263                 break;
 264         default:
 265                 dev_err(pctrl->dev, "Unsupported config parameter: %x\n",
 266                         param);
 267                 return -EINVAL;
 268         }
 269
 270         *config = pinconf_to_config_packed(param, arg);
 271
 272         return 0;
 273 }
 274
 275 static int msm_config_group_set(struct pinctrl_dev *pctldev,
 276                                 unsigned group,
 277                                 unsigned long *configs,
 278                                 unsigned num_configs)
 279 {
 280         const struct msm_pingroup *g;
 281         struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
 282         unsigned long flags;
 283         unsigned param;
 284         unsigned mask;
 285         unsigned arg;
 286         unsigned bit;
 287         int ret;
 288         u32 val;
 289         int i;
 290
 291         g = &pctrl->soc->groups[group];
 292
 293         for (i = 0; i < num_configs; i++) {
 294                 param = pinconf_to_config_param(configs[i]);
 295                 arg = pinconf_to_config_argument(configs[i]);
 296
 297                 ret = msm_config_reg(pctrl, g, param, &mask, &bit);
 298                 if (ret < 0)
 299                         return ret;
 300
 301                 /* Convert pinconf values to register values */
 302                 switch (param) {
 303                 case PIN_CONFIG_BIAS_DISABLE:
 304                         arg = MSM_NO_PULL;
 305                         break;
 306                 case PIN_CONFIG_BIAS_PULL_DOWN:
 307                         arg = MSM_PULL_DOWN;
 308                         break;
 309                 case PIN_CONFIG_BIAS_BUS_HOLD:
 310                         arg = MSM_KEEPER;
 311                         break;
 312                 case PIN_CONFIG_BIAS_PULL_UP:
 313                         arg = MSM_PULL_UP;
 314                         break;
 315                 case PIN_CONFIG_DRIVE_STRENGTH:
 316                         /* Check for invalid values */
 317                         if (arg > 16 || arg < 2 || (arg % 2) != 0)
 318                                 arg = -1;
 319                         else
 320                                 arg = (arg / 2) - 1;
 321                         break;
 322                 case PIN_CONFIG_OUTPUT:
 323                         /* set output value */
 324                         spin_lock_irqsave(&pctrl->lock, flags);
 325                         val = readl(pctrl->regs + g->io_reg);
 326                         if (arg)
 327                                 val |= BIT(g->out_bit);
 328                         else
 329                                 val &= ~BIT(g->out_bit);
 330                         writel(val, pctrl->regs + g->io_reg);
 331                         spin_unlock_irqrestore(&pctrl->lock, flags);
 332
 333                         /* enable output */
 334                         arg = 1;
 335                         break;
 336                 default:
 337                         dev_err(pctrl->dev, "Unsupported config parameter: %x\n",
 338                                 param);
 339                         return -EINVAL;
 340                 }
 341
 342                 /* Range-check user-supplied value */
 343                 if (arg & ~mask) {
 344                         dev_err(pctrl->dev, "config %x: %x is invalid\n", param, arg);
 345                         return -EINVAL;
 346                 }
 347
 348                 spin_lock_irqsave(&pctrl->lock, flags);
 349                 val = readl(pctrl->regs + g->ctl_reg);
 350                 val &= ~(mask << bit);
 351                 val |= arg << bit;
 352                 writel(val, pctrl->regs + g->ctl_reg);
 353                 spin_unlock_irqrestore(&pctrl->lock, flags);
 354         }
 355
 356         return 0;
 357 }
 358
 359 static const struct pinconf_ops msm_pinconf_ops = {
 360         .pin_config_group_get   = msm_config_group_get,
 361         .pin_config_group_set   = msm_config_group_set,
 362 };
 363
 364 static struct pinctrl_desc msm_pinctrl_desc = {
 365         .pctlops = &msm_pinctrl_ops,
 366         .pmxops = &msm_pinmux_ops,
 367         .confops = &msm_pinconf_ops,
 368         .owner = THIS_MODULE,
 369 };
 370
 371 static int msm_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
 372 {
 373         const struct msm_pingroup *g;
 374         struct msm_pinctrl *pctrl = container_of(chip, struct msm_pinctrl, chip);
 375         unsigned long flags;
 376         u32 val;
 377
 378         g = &pctrl->soc->groups[offset];
 379
 380         spin_lock_irqsave(&pctrl->lock, flags);
 381
 382         val = readl(pctrl->regs + g->ctl_reg);
 383         val &= ~BIT(g->oe_bit);
 384         writel(val, pctrl->regs + g->ctl_reg);
 385
 386         spin_unlock_irqrestore(&pctrl->lock, flags);
 387
 388         return 0;
 389 }
 390
 391 static int msm_gpio_direction_output(struct gpio_chip *chip, unsigned offset, int value)
 392 {
 393         const struct msm_pingroup *g;
 394         struct msm_pinctrl *pctrl = container_of(chip, struct msm_pinctrl, chip);
 395         unsigned long flags;
 396         u32 val;
 397
 398         g = &pctrl->soc->groups[offset];
 399
 400         spin_lock_irqsave(&pctrl->lock, flags);
 401
 402         val = readl(pctrl->regs + g->io_reg);
 403         if (value)
 404                 val |= BIT(g->out_bit);
 405         else
 406                 val &= ~BIT(g->out_bit);
 407         writel(val, pctrl->regs + g->io_reg);
 408
 409         val = readl(pctrl->regs + g->ctl_reg);
 410         val |= BIT(g->oe_bit);
 411         writel(val, pctrl->regs + g->ctl_reg);
 412
 413         spin_unlock_irqrestore(&pctrl->lock, flags);
 414
 415         return 0;
 416 }
 417
 418 static int msm_gpio_get(struct gpio_chip *chip, unsigned offset)
 419 {
 420         const struct msm_pingroup *g;
 421         struct msm_pinctrl *pctrl = container_of(chip, struct msm_pinctrl, chip);
 422         u32 val;
 423
 424         g = &pctrl->soc->groups[offset];
 425
 426         val = readl(pctrl->regs + g->io_reg);
 427         return !!(val & BIT(g->in_bit));
 428 }
 429
 430 static void msm_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
 431 {
 432         const struct msm_pingroup *g;
 433         struct msm_pinctrl *pctrl = container_of(chip, struct msm_pinctrl, chip);
 434         unsigned long flags;
 435         u32 val;
 436
 437         g = &pctrl->soc->groups[offset];
 438
 439         spin_lock_irqsave(&pctrl->lock, flags);
 440
 441         val = readl(pctrl->regs + g->io_reg);
 442         if (value)
 443                 val |= BIT(g->out_bit);
 444         else
 445                 val &= ~BIT(g->out_bit);
 446         writel(val, pctrl->regs + g->io_reg);
 447
 448         spin_unlock_irqrestore(&pctrl->lock, flags);
 449 }
 450
 451 static int msm_gpio_request(struct gpio_chip *chip, unsigned offset)
 452 {
 453         int gpio = chip->base + offset;
 454         return pinctrl_request_gpio(gpio);
 455 }
 456
 457 static void msm_gpio_free(struct gpio_chip *chip, unsigned offset)
 458 {
 459         int gpio = chip->base + offset;
 460         return pinctrl_free_gpio(gpio);
 461 }
 462
 463 #ifdef CONFIG_DEBUG_FS
 464 #include <linux/seq_file.h>
 465
 466 static void msm_gpio_dbg_show_one(struct seq_file *s,
 467                                   struct pinctrl_dev *pctldev,
 468                                   struct gpio_chip *chip,
 469                                   unsigned offset,
 470                                   unsigned gpio)
 471 {
 472         const struct msm_pingroup *g;
 473         struct msm_pinctrl *pctrl = container_of(chip, struct msm_pinctrl, chip);
 474         unsigned func;
 475         int is_out;
 476         int drive;
 477         int pull;
 478         u32 ctl_reg;
 479
 480         static const char * const pulls[] = {
 481                 "no pull",
 482                 "pull down",
 483                 "keeper",
 484                 "pull up"
 485         };
 486
 487         g = &pctrl->soc->groups[offset];
 488         ctl_reg = readl(pctrl->regs + g->ctl_reg);
 489
 490         is_out = !!(ctl_reg & BIT(g->oe_bit));
 491         func = (ctl_reg >> g->mux_bit) & 7;
 492         drive = (ctl_reg >> g->drv_bit) & 7;
 493         pull = (ctl_reg >> g->pull_bit) & 3;
 494
 495         seq_printf(s, " %-8s: %-3s %d", g->name, is_out ? "out" : "in", func);
 496         seq_printf(s, " %dmA", msm_regval_to_drive(drive));
 497         seq_printf(s, " %s", pulls[pull]);
 498 }
 499
 500 static void msm_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
 501 {
 502         unsigned gpio = chip->base;
 503         unsigned i;
 504
 505         for (i = 0; i < chip->ngpio; i++, gpio++) {
 506                 msm_gpio_dbg_show_one(s, NULL, chip, i, gpio);
 507                 seq_puts(s, "\n");
 508         }
 509 }
 510
 511 #else
 512 #define msm_gpio_dbg_show NULL
 513 #endif
 514
 515 static struct gpio_chip msm_gpio_template = {
 516         .direction_input  = msm_gpio_direction_input,
 517         .direction_output = msm_gpio_direction_output,
 518         .get              = msm_gpio_get,
 519         .set              = msm_gpio_set,
 520         .request          = msm_gpio_request,
 521         .free             = msm_gpio_free,
 522         .dbg_show         = msm_gpio_dbg_show,
 523 };
 524
 525 /* For dual-edge interrupts in software, since some hardware has no
 526  * such support:
 527  *
 528  * At appropriate moments, this function may be called to flip the polarity
 529  * settings of both-edge irq lines to try and catch the next edge.
 530  *
 531  * The attempt is considered successful if:
 532  * - the status bit goes high, indicating that an edge was caught, or
 533  * - the input value of the gpio doesn't change during the attempt.
 534  * If the value changes twice during the process, that would cause the first
 535  * test to fail but would force the second, as two opposite
 536  * transitions would cause a detection no matter the polarity setting.
 537  *
 538  * The do-loop tries to sledge-hammer closed the timing hole between
 539  * the initial value-read and the polarity-write - if the line value changes
 540  * during that window, an interrupt is lost, the new polarity setting is
 541  * incorrect, and the first success test will fail, causing a retry.
 542  *
 543  * Algorithm comes from Google's msmgpio driver.
 544  */
 545 static void msm_gpio_update_dual_edge_pos(struct msm_pinctrl *pctrl,
 546                                           const struct msm_pingroup *g,
 547                                           struct irq_data *d)
 548 {
 549         int loop_limit = 100;
 550         unsigned val, val2, intstat;
 551         unsigned pol;
 552
 553         do {
 554                 val = readl(pctrl->regs + g->io_reg) & BIT(g->in_bit);
 555
 556                 pol = readl(pctrl->regs + g->intr_cfg_reg);
 557                 pol ^= BIT(g->intr_polarity_bit);
 558                 writel(pol, pctrl->regs + g->intr_cfg_reg);
 559
 560                 val2 = readl(pctrl->regs + g->io_reg) & BIT(g->in_bit);
 561                 intstat = readl(pctrl->regs + g->intr_status_reg);
 562                 if (intstat || (val == val2))
 563                         return;
 564         } while (loop_limit-- > 0);
 565         dev_err(pctrl->dev, "dual-edge irq failed to stabilize, %#08x != %#08x\n",
 566                 val, val2);
 567 }
 568
 569 static void msm_gpio_irq_mask(struct irq_data *d)
 570 {
 571         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 572         struct msm_pinctrl *pctrl = to_msm_pinctrl(gc);
 573         const struct msm_pingroup *g;
 574         unsigned long flags;
 575         u32 val;
 576
 577         g = &pctrl->soc->groups[d->hwirq];
 578
 579         spin_lock_irqsave(&pctrl->lock, flags);
 580
 581         val = readl(pctrl->regs + g->intr_cfg_reg);
 582         val &= ~BIT(g->intr_enable_bit);
 583         writel(val, pctrl->regs + g->intr_cfg_reg);
 584
 585         clear_bit(d->hwirq, pctrl->enabled_irqs);
 586
 587         spin_unlock_irqrestore(&pctrl->lock, flags);
 588 }
 589
 590 static void msm_gpio_irq_unmask(struct irq_data *d)
 591 {
 592         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 593         struct msm_pinctrl *pctrl = to_msm_pinctrl(gc);
 594         const struct msm_pingroup *g;
 595         unsigned long flags;
 596         u32 val;
 597
 598         g = &pctrl->soc->groups[d->hwirq];
 599
 600         spin_lock_irqsave(&pctrl->lock, flags);
 601
 602         val = readl(pctrl->regs + g->intr_status_reg);
 603         val &= ~BIT(g->intr_status_bit);
 604         writel(val, pctrl->regs + g->intr_status_reg);
 605
 606         val = readl(pctrl->regs + g->intr_cfg_reg);
 607         val |= BIT(g->intr_enable_bit);
 608         writel(val, pctrl->regs + g->intr_cfg_reg);
 609
 610         set_bit(d->hwirq, pctrl->enabled_irqs);
 611
 612         spin_unlock_irqrestore(&pctrl->lock, flags);
 613 }
 614
 615 static void msm_gpio_irq_ack(struct irq_data *d)
 616 {
 617         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 618         struct msm_pinctrl *pctrl = to_msm_pinctrl(gc);
 619         const struct msm_pingroup *g;
 620         unsigned long flags;
 621         u32 val;
 622
 623         g = &pctrl->soc->groups[d->hwirq];
 624
 625         spin_lock_irqsave(&pctrl->lock, flags);
 626
 627         val = readl(pctrl->regs + g->intr_status_reg);
 628         if (g->intr_ack_high)
 629                 val |= BIT(g->intr_status_bit);
 630         else
 631                 val &= ~BIT(g->intr_status_bit);
 632         writel(val, pctrl->regs + g->intr_status_reg);
 633
 634         if (test_bit(d->hwirq, pctrl->dual_edge_irqs))
 635                 msm_gpio_update_dual_edge_pos(pctrl, g, d);
 636
 637         spin_unlock_irqrestore(&pctrl->lock, flags);
 638 }
 639
 640 static int msm_gpio_irq_set_type(struct irq_data *d, unsigned int type)
 641 {
 642         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 643         struct msm_pinctrl *pctrl = to_msm_pinctrl(gc);
 644         const struct msm_pingroup *g;
 645         unsigned long flags;
 646         u32 val;
 647
 648         g = &pctrl->soc->groups[d->hwirq];
 649
 650         spin_lock_irqsave(&pctrl->lock, flags);
 651
 652         /*
 653          * For hw without possibility of detecting both edges
 654          */
 655         if (g->intr_detection_width == 1 && type == IRQ_TYPE_EDGE_BOTH)
 656                 set_bit(d->hwirq, pctrl->dual_edge_irqs);
 657         else
 658                 clear_bit(d->hwirq, pctrl->dual_edge_irqs);
 659
 660         /* Route interrupts to application cpu */
 661         val = readl(pctrl->regs + g->intr_target_reg);
 662         val &= ~(7 << g->intr_target_bit);
 663         val |= g->intr_target_kpss_val << g->intr_target_bit;
 664         writel(val, pctrl->regs + g->intr_target_reg);
 665
 666         /* Update configuration for gpio.
 667          * RAW_STATUS_EN is left on for all gpio irqs. Due to the
 668          * internal circuitry of TLMM, toggling the RAW_STATUS
 669          * could cause the INTR_STATUS to be set for EDGE interrupts.
 670          */
 671         val = readl(pctrl->regs + g->intr_cfg_reg);
 672         val |= BIT(g->intr_raw_status_bit);
 673         if (g->intr_detection_width == 2) {
 674                 val &= ~(3 << g->intr_detection_bit);
 675                 val &= ~(1 << g->intr_polarity_bit);
 676                 switch (type) {
 677                 case IRQ_TYPE_EDGE_RISING:
 678                         val |= 1 << g->intr_detection_bit;
 679                         val |= BIT(g->intr_polarity_bit);
 680                         break;
 681                 case IRQ_TYPE_EDGE_FALLING:
 682                         val |= 2 << g->intr_detection_bit;
 683                         val |= BIT(g->intr_polarity_bit);
 684                         break;
 685                 case IRQ_TYPE_EDGE_BOTH:
 686                         val |= 3 << g->intr_detection_bit;
 687                         val |= BIT(g->intr_polarity_bit);
 688                         break;
 689                 case IRQ_TYPE_LEVEL_LOW:
 690                         break;
 691                 case IRQ_TYPE_LEVEL_HIGH:
 692                         val |= BIT(g->intr_polarity_bit);
 693                         break;
 694                 }
 695         } else if (g->intr_detection_width == 1) {
 696                 val &= ~(1 << g->intr_detection_bit);
 697                 val &= ~(1 << g->intr_polarity_bit);
 698                 switch (type) {
 699                 case IRQ_TYPE_EDGE_RISING:
 700                         val |= BIT(g->intr_detection_bit);
 701                         val |= BIT(g->intr_polarity_bit);
 702                         break;
 703                 case IRQ_TYPE_EDGE_FALLING:
 704                         val |= BIT(g->intr_detection_bit);
 705                         break;
 706                 case IRQ_TYPE_EDGE_BOTH:
 707                         val |= BIT(g->intr_detection_bit);
 708                         val |= BIT(g->intr_polarity_bit);
 709                         break;
 710                 case IRQ_TYPE_LEVEL_LOW:
 711                         break;
 712                 case IRQ_TYPE_LEVEL_HIGH:
 713                         val |= BIT(g->intr_polarity_bit);
 714                         break;
 715                 }
 716         } else {
 717                 BUG();
 718         }
 719         writel(val, pctrl->regs + g->intr_cfg_reg);
 720
 721         if (test_bit(d->hwirq, pctrl->dual_edge_irqs))
 722                 msm_gpio_update_dual_edge_pos(pctrl, g, d);
 723
 724         spin_unlock_irqrestore(&pctrl->lock, flags);
 725
 726         if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
 727                 __irq_set_handler_locked(d->irq, handle_level_irq);
 728         else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
 729                 __irq_set_handler_locked(d->irq, handle_edge_irq);
 730
 731         return 0;
 732 }
 733
 734 static int msm_gpio_irq_set_wake(struct irq_data *d, unsigned int on)
 735 {
 736         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 737         struct msm_pinctrl *pctrl = to_msm_pinctrl(gc);
 738         unsigned long flags;
 739
 740         spin_lock_irqsave(&pctrl->lock, flags);
 741
 742         irq_set_irq_wake(pctrl->irq, on);
 743
 744         spin_unlock_irqrestore(&pctrl->lock, flags);
 745
 746         return 0;
 747 }
 748
 749 static struct irq_chip msm_gpio_irq_chip = {
 750         .name           = "msmgpio",
 751         .irq_mask       = msm_gpio_irq_mask,
 752         .irq_unmask     = msm_gpio_irq_unmask,
 753         .irq_ack        = msm_gpio_irq_ack,
 754         .irq_set_type   = msm_gpio_irq_set_type,
 755         .irq_set_wake   = msm_gpio_irq_set_wake,
 756 };
 757
 758 static void msm_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
 759 {
 760         struct gpio_chip *gc = irq_desc_get_handler_data(desc);
 761         const struct msm_pingroup *g;
 762         struct msm_pinctrl *pctrl = to_msm_pinctrl(gc);
 763         struct irq_chip *chip = irq_get_chip(irq);
 764         int irq_pin;
 765         int handled = 0;
 766         u32 val;
 767         int i;
 768
 769         chained_irq_enter(chip, desc);
 770
 771         /*
 772          * Each pin has it's own IRQ status register, so use
 773          * enabled_irq bitmap to limit the number of reads.
 774          */
 775         for_each_set_bit(i, pctrl->enabled_irqs, pctrl->chip.ngpio) {
 776                 g = &pctrl->soc->groups[i];
 777                 val = readl(pctrl->regs + g->intr_status_reg);
 778                 if (val & BIT(g->intr_status_bit)) {
 779                         irq_pin = irq_find_mapping(gc->irqdomain, i);
 780                         generic_handle_irq(irq_pin);
 781                         handled++;
 782                 }
 783         }
 784
 785         /* No interrupts were flagged */
 786         if (handled == 0)
 787                 handle_bad_irq(irq, desc);
 788
 789         chained_irq_exit(chip, desc);
 790 }
 791
 792 static int msm_gpio_init(struct msm_pinctrl *pctrl)
 793 {
 794         struct gpio_chip *chip;
 795         int ret;
 796         unsigned ngpio = pctrl->soc->ngpios;
 797
 798         if (WARN_ON(ngpio > MAX_NR_GPIO))
 799                 return -EINVAL;
 800
 801         chip = &pctrl->chip;
 802         chip->base = 0;
 803         chip->ngpio = ngpio;
 804         chip->label = dev_name(pctrl->dev);
 805         chip->dev = pctrl->dev;
 806         chip->owner = THIS_MODULE;
 807         chip->of_node = pctrl->dev->of_node;
 808
 809         ret = gpiochip_add(&pctrl->chip);
 810         if (ret) {
 811                 dev_err(pctrl->dev, "Failed register gpiochip\n");
 812                 return ret;
 813         }
 814
 815         ret = gpiochip_add_pin_range(&pctrl->chip, dev_name(pctrl->dev), 0, 0, chip->ngpio);
 816         if (ret) {
 817                 dev_err(pctrl->dev, "Failed to add pin range\n");
 818                 gpiochip_remove(&pctrl->chip);
 819                 return ret;
 820         }
 821
 822         ret = gpiochip_irqchip_add(chip,
 823                                    &msm_gpio_irq_chip,
 824                                    0,
 825                                    handle_edge_irq,
 826                                    IRQ_TYPE_NONE);
 827         if (ret) {
 828                 dev_err(pctrl->dev, "Failed to add irqchip to gpiochip\n");
 829                 gpiochip_remove(&pctrl->chip);
 830                 return -ENOSYS;
 831         }
 832
 833         gpiochip_set_chained_irqchip(chip, &msm_gpio_irq_chip, pctrl->irq,
 834                                      msm_gpio_irq_handler);
 835
 836         return 0;
 837 }
 838
 839 static int msm_ps_hold_restart(struct notifier_block *nb, unsigned long action,
 840                                void *data)
 841 {
 842         struct msm_pinctrl *pctrl = container_of(nb, struct msm_pinctrl, restart_nb);
 843
 844         writel(0, pctrl->regs + PS_HOLD_OFFSET);
 845         mdelay(1000);
 846         return NOTIFY_DONE;
 847 }
 848
 849 static void msm_pinctrl_setup_pm_reset(struct msm_pinctrl *pctrl)
 850 {
 851         int i;
 852         const struct msm_function *func = pctrl->soc->functions;
 853
 854         for (i = 0; i < pctrl->soc->nfunctions; i++)
 855                 if (!strcmp(func[i].name, "ps_hold")) {
 856                         pctrl->restart_nb.notifier_call = msm_ps_hold_restart;
 857                         pctrl->restart_nb.priority = 128;
 858                         if (register_restart_handler(&pctrl->restart_nb))
 859                                 dev_err(pctrl->dev,
 860                                         "failed to setup restart handler.\n");
 861                         break;
 862                 }
 863 }
 864
 865 int msm_pinctrl_probe(struct platform_device *pdev,
 866                       const struct msm_pinctrl_soc_data *soc_data)
 867 {
 868         struct msm_pinctrl *pctrl;
 869         struct resource *res;
 870         int ret;
 871
 872         pctrl = devm_kzalloc(&pdev->dev, sizeof(*pctrl), GFP_KERNEL);
 873         if (!pctrl) {
 874                 dev_err(&pdev->dev, "Can't allocate msm_pinctrl\n");
 875                 return -ENOMEM;
 876         }
 877         pctrl->dev = &pdev->dev;
 878         pctrl->soc = soc_data;
 879         pctrl->chip = msm_gpio_template;
 880
 881         spin_lock_init(&pctrl->lock);
 882
 883         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 884         pctrl->regs = devm_ioremap_resource(&pdev->dev, res);
 885         if (IS_ERR(pctrl->regs))
 886                 return PTR_ERR(pctrl->regs);
 887
 888         msm_pinctrl_setup_pm_reset(pctrl);
 889
 890         pctrl->irq = platform_get_irq(pdev, 0);
 891         if (pctrl->irq < 0) {
 892                 dev_err(&pdev->dev, "No interrupt defined for msmgpio\n");
 893                 return pctrl->irq;
 894         }
 895
 896         msm_pinctrl_desc.name = dev_name(&pdev->dev);
 897         msm_pinctrl_desc.pins = pctrl->soc->pins;
 898         msm_pinctrl_desc.npins = pctrl->soc->npins;
 899         pctrl->pctrl = pinctrl_register(&msm_pinctrl_desc, &pdev->dev, pctrl);
 900         if (!pctrl->pctrl) {
 901                 dev_err(&pdev->dev, "Couldn't register pinctrl driver\n");
 902                 return -ENODEV;
 903         }
 904
 905         ret = msm_gpio_init(pctrl);
 906         if (ret) {
 907                 pinctrl_unregister(pctrl->pctrl);
 908                 return ret;
 909         }
 910
 911         platform_set_drvdata(pdev, pctrl);
 912
 913         dev_dbg(&pdev->dev, "Probed Qualcomm pinctrl driver\n");
 914
 915         return 0;
 916 }
 917 EXPORT_SYMBOL(msm_pinctrl_probe);
 918
 919 int msm_pinctrl_remove(struct platform_device *pdev)
 920 {
 921         struct msm_pinctrl *pctrl = platform_get_drvdata(pdev);
 922
 923         gpiochip_remove(&pctrl->chip);
 924         pinctrl_unregister(pctrl->pctrl);
 925
 926         unregister_restart_handler(&pctrl->restart_nb);
 927
 928         return 0;
 929 }
 930 EXPORT_SYMBOL(msm_pinctrl_remove);
 931