drivers/pinctrl/pinctrl-sunxi.c

   1 /*
   2  * Allwinner A1X SoCs pinctrl driver.
   3  *
   4  * Copyright (C) 2012 Maxime Ripard
   5  *
   6  * Maxime Ripard <maxime.ripard@free-electrons.com>
   7  *
   8  * This file is licensed under the terms of the GNU General Public
   9  * License version 2.  This program is licensed "as is" without any
  10  * warranty of any kind, whether express or implied.
  11  */
  12
  13 #include <linux/io.h>
  14 #include <linux/clk.h>
  15 #include <linux/gpio.h>
  16 #include <linux/irqdomain.h>
  17 #include <linux/module.h>
  18 #include <linux/of.h>
  19 #include <linux/of_address.h>
  20 #include <linux/of_device.h>
  21 #include <linux/of_irq.h>
  22 #include <linux/pinctrl/consumer.h>
  23 #include <linux/pinctrl/machine.h>
  24 #include <linux/pinctrl/pinctrl.h>
  25 #include <linux/pinctrl/pinconf-generic.h>
  26 #include <linux/pinctrl/pinmux.h>
  27 #include <linux/platform_device.h>
  28 #include <linux/slab.h>
  29
  30 #include "core.h"
  31 #include "pinctrl-sunxi.h"
  32 #include "pinctrl-sunxi-pins.h"
  33
  34 static struct sunxi_pinctrl_group *
  35 sunxi_pinctrl_find_group_by_name(struct sunxi_pinctrl *pctl, const char *group)
  36 {
  37         int i;
  38
  39         for (i = 0; i < pctl->ngroups; i++) {
  40                 struct sunxi_pinctrl_group *grp = pctl->groups + i;
  41
  42                 if (!strcmp(grp->name, group))
  43                         return grp;
  44         }
  45
  46         return NULL;
  47 }
  48
  49 static struct sunxi_pinctrl_function *
  50 sunxi_pinctrl_find_function_by_name(struct sunxi_pinctrl *pctl,
  51                                     const char *name)
  52 {
  53         struct sunxi_pinctrl_function *func = pctl->functions;
  54         int i;
  55
  56         for (i = 0; i < pctl->nfunctions; i++) {
  57                 if (!func[i].name)
  58                         break;
  59
  60                 if (!strcmp(func[i].name, name))
  61                         return func + i;
  62         }
  63
  64         return NULL;
  65 }
  66
  67 static struct sunxi_desc_function *
  68 sunxi_pinctrl_desc_find_function_by_name(struct sunxi_pinctrl *pctl,
  69                                          const char *pin_name,
  70                                          const char *func_name)
  71 {
  72         int i;
  73
  74         for (i = 0; i < pctl->desc->npins; i++) {
  75                 const struct sunxi_desc_pin *pin = pctl->desc->pins + i;
  76
  77                 if (!strcmp(pin->pin.name, pin_name)) {
  78                         struct sunxi_desc_function *func = pin->functions;
  79
  80                         while (func->name) {
  81                                 if (!strcmp(func->name, func_name))
  82                                         return func;
  83
  84                                 func++;
  85                         }
  86                 }
  87         }
  88
  89         return NULL;
  90 }
  91
  92 static struct sunxi_desc_function *
  93 sunxi_pinctrl_desc_find_function_by_pin(struct sunxi_pinctrl *pctl,
  94                                         const u16 pin_num,
  95                                         const char *func_name)
  96 {
  97         int i;
  98
  99         for (i = 0; i < pctl->desc->npins; i++) {
 100                 const struct sunxi_desc_pin *pin = pctl->desc->pins + i;
 101
 102                 if (pin->pin.number == pin_num) {
 103                         struct sunxi_desc_function *func = pin->functions;
 104
 105                         while (func->name) {
 106                                 if (!strcmp(func->name, func_name))
 107                                         return func;
 108
 109                                 func++;
 110                         }
 111                 }
 112         }
 113
 114         return NULL;
 115 }
 116
 117 static int sunxi_pctrl_get_groups_count(struct pinctrl_dev *pctldev)
 118 {
 119         struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
 120
 121         return pctl->ngroups;
 122 }
 123
 124 static const char *sunxi_pctrl_get_group_name(struct pinctrl_dev *pctldev,
 125                                               unsigned group)
 126 {
 127         struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
 128
 129         return pctl->groups[group].name;
 130 }
 131
 132 static int sunxi_pctrl_get_group_pins(struct pinctrl_dev *pctldev,
 133                                       unsigned group,
 134                                       const unsigned **pins,
 135                                       unsigned *num_pins)
 136 {
 137         struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
 138
 139         *pins = (unsigned *)&pctl->groups[group].pin;
 140         *num_pins = 1;
 141
 142         return 0;
 143 }
 144
 145 static int sunxi_pctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
 146                                       struct device_node *node,
 147                                       struct pinctrl_map **map,
 148                                       unsigned *num_maps)
 149 {
 150         struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
 151         unsigned long *pinconfig;
 152         struct property *prop;
 153         const char *function;
 154         const char *group;
 155         int ret, nmaps, i = 0;
 156         u32 val;
 157
 158         *map = NULL;
 159         *num_maps = 0;
 160
 161         ret = of_property_read_string(node, "allwinner,function", &function);
 162         if (ret) {
 163                 dev_err(pctl->dev,
 164                         "missing allwinner,function property in node %s\n",
 165                         node->name);
 166                 return -EINVAL;
 167         }
 168
 169         nmaps = of_property_count_strings(node, "allwinner,pins") * 2;
 170         if (nmaps < 0) {
 171                 dev_err(pctl->dev,
 172                         "missing allwinner,pins property in node %s\n",
 173                         node->name);
 174                 return -EINVAL;
 175         }
 176
 177         *map = kmalloc(nmaps * sizeof(struct pinctrl_map), GFP_KERNEL);
 178         if (!*map)
 179                 return -ENOMEM;
 180
 181         of_property_for_each_string(node, "allwinner,pins", prop, group) {
 182                 struct sunxi_pinctrl_group *grp =
 183                         sunxi_pinctrl_find_group_by_name(pctl, group);
 184                 int j = 0, configlen = 0;
 185
 186                 if (!grp) {
 187                         dev_err(pctl->dev, "unknown pin %s", group);
 188                         continue;
 189                 }
 190
 191                 if (!sunxi_pinctrl_desc_find_function_by_name(pctl,
 192                                                               grp->name,
 193                                                               function)) {
 194                         dev_err(pctl->dev, "unsupported function %s on pin %s",
 195                                 function, group);
 196                         continue;
 197                 }
 198
 199                 (*map)[i].type = PIN_MAP_TYPE_MUX_GROUP;
 200                 (*map)[i].data.mux.group = group;
 201                 (*map)[i].data.mux.function = function;
 202
 203                 i++;
 204
 205                 (*map)[i].type = PIN_MAP_TYPE_CONFIGS_GROUP;
 206                 (*map)[i].data.configs.group_or_pin = group;
 207
 208                 if (of_find_property(node, "allwinner,drive", NULL))
 209                         configlen++;
 210                 if (of_find_property(node, "allwinner,pull", NULL))
 211                         configlen++;
 212
 213                 pinconfig = kzalloc(configlen * sizeof(*pinconfig), GFP_KERNEL);
 214
 215                 if (!of_property_read_u32(node, "allwinner,drive", &val)) {
 216                         u16 strength = (val + 1) * 10;
 217                         pinconfig[j++] =
 218                                 pinconf_to_config_packed(PIN_CONFIG_DRIVE_STRENGTH,
 219                                                          strength);
 220                 }
 221
 222                 if (!of_property_read_u32(node, "allwinner,pull", &val)) {
 223                         enum pin_config_param pull = PIN_CONFIG_END;
 224                         if (val == 1)
 225                                 pull = PIN_CONFIG_BIAS_PULL_UP;
 226                         else if (val == 2)
 227                                 pull = PIN_CONFIG_BIAS_PULL_DOWN;
 228                         pinconfig[j++] = pinconf_to_config_packed(pull, 0);
 229                 }
 230
 231                 (*map)[i].data.configs.configs = pinconfig;
 232                 (*map)[i].data.configs.num_configs = configlen;
 233
 234                 i++;
 235         }
 236
 237         *num_maps = nmaps;
 238
 239         return 0;
 240 }
 241
 242 static void sunxi_pctrl_dt_free_map(struct pinctrl_dev *pctldev,
 243                                     struct pinctrl_map *map,
 244                                     unsigned num_maps)
 245 {
 246         int i;
 247
 248         for (i = 0; i < num_maps; i++) {
 249                 if (map[i].type == PIN_MAP_TYPE_CONFIGS_GROUP)
 250                         kfree(map[i].data.configs.configs);
 251         }
 252
 253         kfree(map);
 254 }
 255
 256 static const struct pinctrl_ops sunxi_pctrl_ops = {
 257         .dt_node_to_map         = sunxi_pctrl_dt_node_to_map,
 258         .dt_free_map            = sunxi_pctrl_dt_free_map,
 259         .get_groups_count       = sunxi_pctrl_get_groups_count,
 260         .get_group_name         = sunxi_pctrl_get_group_name,
 261         .get_group_pins         = sunxi_pctrl_get_group_pins,
 262 };
 263
 264 static int sunxi_pconf_group_get(struct pinctrl_dev *pctldev,
 265                                  unsigned group,
 266                                  unsigned long *config)
 267 {
 268         struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
 269
 270         *config = pctl->groups[group].config;
 271
 272         return 0;
 273 }
 274
 275 static int sunxi_pconf_group_set(struct pinctrl_dev *pctldev,
 276                                  unsigned group,
 277                                  unsigned long *configs,
 278                                  unsigned num_configs)
 279 {
 280         struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
 281         struct sunxi_pinctrl_group *g = &pctl->groups[group];
 282         unsigned long flags;
 283         u32 val, mask;
 284         u16 strength;
 285         u8 dlevel;
 286         int i;
 287
 288         spin_lock_irqsave(&pctl->lock, flags);
 289
 290         for (i = 0; i < num_configs; i++) {
 291                 switch (pinconf_to_config_param(configs[i])) {
 292                 case PIN_CONFIG_DRIVE_STRENGTH:
 293                         strength = pinconf_to_config_argument(configs[i]);
 294                         if (strength > 40) {
 295                                 spin_unlock_irqrestore(&pctl->lock, flags);
 296                                 return -EINVAL;
 297                         }
 298                         /*
 299                          * We convert from mA to what the register expects:
 300                          *   0: 10mA
 301                          *   1: 20mA
 302                          *   2: 30mA
 303                          *   3: 40mA
 304                          */
 305                         dlevel = strength / 10 - 1;
 306                         val = readl(pctl->membase + sunxi_dlevel_reg(g->pin));
 307                         mask = DLEVEL_PINS_MASK << sunxi_dlevel_offset(g->pin);
 308                         writel((val & ~mask)
 309                                 | dlevel << sunxi_dlevel_offset(g->pin),
 310                                 pctl->membase + sunxi_dlevel_reg(g->pin));
 311                         break;
 312                 case PIN_CONFIG_BIAS_PULL_UP:
 313                         val = readl(pctl->membase + sunxi_pull_reg(g->pin));
 314                         mask = PULL_PINS_MASK << sunxi_pull_offset(g->pin);
 315                         writel((val & ~mask) | 1 << sunxi_pull_offset(g->pin),
 316                                 pctl->membase + sunxi_pull_reg(g->pin));
 317                         break;
 318                 case PIN_CONFIG_BIAS_PULL_DOWN:
 319                         val = readl(pctl->membase + sunxi_pull_reg(g->pin));
 320                         mask = PULL_PINS_MASK << sunxi_pull_offset(g->pin);
 321                         writel((val & ~mask) | 2 << sunxi_pull_offset(g->pin),
 322                                 pctl->membase + sunxi_pull_reg(g->pin));
 323                         break;
 324                 default:
 325                         break;
 326                 }
 327                 /* cache the config value */
 328                 g->config = configs[i];
 329         } /* for each config */
 330
 331         spin_unlock_irqrestore(&pctl->lock, flags);
 332
 333         return 0;
 334 }
 335
 336 static const struct pinconf_ops sunxi_pconf_ops = {
 337         .pin_config_group_get   = sunxi_pconf_group_get,
 338         .pin_config_group_set   = sunxi_pconf_group_set,
 339 };
 340
 341 static int sunxi_pmx_get_funcs_cnt(struct pinctrl_dev *pctldev)
 342 {
 343         struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
 344
 345         return pctl->nfunctions;
 346 }
 347
 348 static const char *sunxi_pmx_get_func_name(struct pinctrl_dev *pctldev,
 349                                            unsigned function)
 350 {
 351         struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
 352
 353         return pctl->functions[function].name;
 354 }
 355
 356 static int sunxi_pmx_get_func_groups(struct pinctrl_dev *pctldev,
 357                                      unsigned function,
 358                                      const char * const **groups,
 359                                      unsigned * const num_groups)
 360 {
 361         struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
 362
 363         *groups = pctl->functions[function].groups;
 364         *num_groups = pctl->functions[function].ngroups;
 365
 366         return 0;
 367 }
 368
 369 static void sunxi_pmx_set(struct pinctrl_dev *pctldev,
 370                                  unsigned pin,
 371                                  u8 config)
 372 {
 373         struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
 374         unsigned long flags;
 375         u32 val, mask;
 376
 377         spin_lock_irqsave(&pctl->lock, flags);
 378
 379         val = readl(pctl->membase + sunxi_mux_reg(pin));
 380         mask = MUX_PINS_MASK << sunxi_mux_offset(pin);
 381         writel((val & ~mask) | config << sunxi_mux_offset(pin),
 382                 pctl->membase + sunxi_mux_reg(pin));
 383
 384         spin_unlock_irqrestore(&pctl->lock, flags);
 385 }
 386
 387 static int sunxi_pmx_enable(struct pinctrl_dev *pctldev,
 388                             unsigned function,
 389                             unsigned group)
 390 {
 391         struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
 392         struct sunxi_pinctrl_group *g = pctl->groups + group;
 393         struct sunxi_pinctrl_function *func = pctl->functions + function;
 394         struct sunxi_desc_function *desc =
 395                 sunxi_pinctrl_desc_find_function_by_name(pctl,
 396                                                          g->name,
 397                                                          func->name);
 398
 399         if (!desc)
 400                 return -EINVAL;
 401
 402         sunxi_pmx_set(pctldev, g->pin, desc->muxval);
 403
 404         return 0;
 405 }
 406
 407 static int
 408 sunxi_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
 409                         struct pinctrl_gpio_range *range,
 410                         unsigned offset,
 411                         bool input)
 412 {
 413         struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
 414         struct sunxi_desc_function *desc;
 415         const char *func;
 416
 417         if (input)
 418                 func = "gpio_in";
 419         else
 420                 func = "gpio_out";
 421
 422         desc = sunxi_pinctrl_desc_find_function_by_pin(pctl, offset, func);
 423         if (!desc)
 424                 return -EINVAL;
 425
 426         sunxi_pmx_set(pctldev, offset, desc->muxval);
 427
 428         return 0;
 429 }
 430
 431 static const struct pinmux_ops sunxi_pmx_ops = {
 432         .get_functions_count    = sunxi_pmx_get_funcs_cnt,
 433         .get_function_name      = sunxi_pmx_get_func_name,
 434         .get_function_groups    = sunxi_pmx_get_func_groups,
 435         .enable                 = sunxi_pmx_enable,
 436         .gpio_set_direction     = sunxi_pmx_gpio_set_direction,
 437 };
 438
 439 static struct pinctrl_desc sunxi_pctrl_desc = {
 440         .confops        = &sunxi_pconf_ops,
 441         .pctlops        = &sunxi_pctrl_ops,
 442         .pmxops         = &sunxi_pmx_ops,
 443 };
 444
 445 static int sunxi_pinctrl_gpio_request(struct gpio_chip *chip, unsigned offset)
 446 {
 447         return pinctrl_request_gpio(chip->base + offset);
 448 }
 449
 450 static void sunxi_pinctrl_gpio_free(struct gpio_chip *chip, unsigned offset)
 451 {
 452         pinctrl_free_gpio(chip->base + offset);
 453 }
 454
 455 static int sunxi_pinctrl_gpio_direction_input(struct gpio_chip *chip,
 456                                         unsigned offset)
 457 {
 458         return pinctrl_gpio_direction_input(chip->base + offset);
 459 }
 460
 461 static int sunxi_pinctrl_gpio_get(struct gpio_chip *chip, unsigned offset)
 462 {
 463         struct sunxi_pinctrl *pctl = dev_get_drvdata(chip->dev);
 464
 465         u32 reg = sunxi_data_reg(offset);
 466         u8 index = sunxi_data_offset(offset);
 467         u32 val = (readl(pctl->membase + reg) >> index) & DATA_PINS_MASK;
 468
 469         return val;
 470 }
 471
 472 static int sunxi_pinctrl_gpio_direction_output(struct gpio_chip *chip,
 473                                         unsigned offset, int value)
 474 {
 475         return pinctrl_gpio_direction_output(chip->base + offset);
 476 }
 477
 478 static void sunxi_pinctrl_gpio_set(struct gpio_chip *chip,
 479                                 unsigned offset, int value)
 480 {
 481         struct sunxi_pinctrl *pctl = dev_get_drvdata(chip->dev);
 482         u32 reg = sunxi_data_reg(offset);
 483         u8 index = sunxi_data_offset(offset);
 484         unsigned long flags;
 485         u32 regval;
 486
 487         spin_lock_irqsave(&pctl->lock, flags);
 488
 489         regval = readl(pctl->membase + reg);
 490
 491         if (value)
 492                 regval |= BIT(index);
 493         else
 494                 regval &= ~(BIT(index));
 495
 496         writel(regval, pctl->membase + reg);
 497
 498         spin_unlock_irqrestore(&pctl->lock, flags);
 499 }
 500
 501 static int sunxi_pinctrl_gpio_of_xlate(struct gpio_chip *gc,
 502                                 const struct of_phandle_args *gpiospec,
 503                                 u32 *flags)
 504 {
 505         int pin, base;
 506
 507         base = PINS_PER_BANK * gpiospec->args[0];
 508         pin = base + gpiospec->args[1];
 509
 510         if (pin > (gc->base + gc->ngpio))
 511                 return -EINVAL;
 512
 513         if (flags)
 514                 *flags = gpiospec->args[2];
 515
 516         return pin;
 517 }
 518
 519 static int sunxi_pinctrl_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
 520 {
 521         struct sunxi_pinctrl *pctl = dev_get_drvdata(chip->dev);
 522         struct sunxi_desc_function *desc;
 523
 524         if (offset >= chip->ngpio)
 525                 return -ENXIO;
 526
 527         desc = sunxi_pinctrl_desc_find_function_by_pin(pctl, offset, "irq");
 528         if (!desc)
 529                 return -EINVAL;
 530
 531         pctl->irq_array[desc->irqnum] = offset;
 532
 533         dev_dbg(chip->dev, "%s: request IRQ for GPIO %d, return %d\n",
 534                 chip->label, offset + chip->base, desc->irqnum);
 535
 536         return irq_find_mapping(pctl->domain, desc->irqnum);
 537 }
 538
 539 static struct gpio_chip sunxi_pinctrl_gpio_chip = {
 540         .owner                  = THIS_MODULE,
 541         .request                = sunxi_pinctrl_gpio_request,
 542         .free                   = sunxi_pinctrl_gpio_free,
 543         .direction_input        = sunxi_pinctrl_gpio_direction_input,
 544         .direction_output       = sunxi_pinctrl_gpio_direction_output,
 545         .get                    = sunxi_pinctrl_gpio_get,
 546         .set                    = sunxi_pinctrl_gpio_set,
 547         .of_xlate               = sunxi_pinctrl_gpio_of_xlate,
 548         .to_irq                 = sunxi_pinctrl_gpio_to_irq,
 549         .of_gpio_n_cells        = 3,
 550         .can_sleep              = 0,
 551 };
 552
 553 static int sunxi_pinctrl_irq_set_type(struct irq_data *d,
 554                                       unsigned int type)
 555 {
 556         struct sunxi_pinctrl *pctl = irq_data_get_irq_chip_data(d);
 557         u32 reg = sunxi_irq_cfg_reg(d->hwirq);
 558         u8 index = sunxi_irq_cfg_offset(d->hwirq);
 559         unsigned long flags;
 560         u32 regval;
 561         u8 mode;
 562
 563         switch (type) {
 564         case IRQ_TYPE_EDGE_RISING:
 565                 mode = IRQ_EDGE_RISING;
 566                 break;
 567         case IRQ_TYPE_EDGE_FALLING:
 568                 mode = IRQ_EDGE_FALLING;
 569                 break;
 570         case IRQ_TYPE_EDGE_BOTH:
 571                 mode = IRQ_EDGE_BOTH;
 572                 break;
 573         case IRQ_TYPE_LEVEL_HIGH:
 574                 mode = IRQ_LEVEL_HIGH;
 575                 break;
 576         case IRQ_TYPE_LEVEL_LOW:
 577                 mode = IRQ_LEVEL_LOW;
 578                 break;
 579         default:
 580                 return -EINVAL;
 581         }
 582
 583         spin_lock_irqsave(&pctl->lock, flags);
 584
 585         regval = readl(pctl->membase + reg);
 586         regval &= ~IRQ_CFG_IRQ_MASK;
 587         writel(regval | (mode << index), pctl->membase + reg);
 588
 589         spin_unlock_irqrestore(&pctl->lock, flags);
 590
 591         return 0;
 592 }
 593
 594 static void sunxi_pinctrl_irq_mask_ack(struct irq_data *d)
 595 {
 596         struct sunxi_pinctrl *pctl = irq_data_get_irq_chip_data(d);
 597         u32 ctrl_reg = sunxi_irq_ctrl_reg(d->hwirq);
 598         u8 ctrl_idx = sunxi_irq_ctrl_offset(d->hwirq);
 599         u32 status_reg = sunxi_irq_status_reg(d->hwirq);
 600         u8 status_idx = sunxi_irq_status_offset(d->hwirq);
 601         unsigned long flags;
 602         u32 val;
 603
 604         spin_lock_irqsave(&pctl->lock, flags);
 605
 606         /* Mask the IRQ */
 607         val = readl(pctl->membase + ctrl_reg);
 608         writel(val & ~(1 << ctrl_idx), pctl->membase + ctrl_reg);
 609
 610         /* Clear the IRQ */
 611         writel(1 << status_idx, pctl->membase + status_reg);
 612
 613         spin_unlock_irqrestore(&pctl->lock, flags);
 614 }
 615
 616 static void sunxi_pinctrl_irq_mask(struct irq_data *d)
 617 {
 618         struct sunxi_pinctrl *pctl = irq_data_get_irq_chip_data(d);
 619         u32 reg = sunxi_irq_ctrl_reg(d->hwirq);
 620         u8 idx = sunxi_irq_ctrl_offset(d->hwirq);
 621         unsigned long flags;
 622         u32 val;
 623
 624         spin_lock_irqsave(&pctl->lock, flags);
 625
 626         /* Mask the IRQ */
 627         val = readl(pctl->membase + reg);
 628         writel(val & ~(1 << idx), pctl->membase + reg);
 629
 630         spin_unlock_irqrestore(&pctl->lock, flags);
 631 }
 632
 633 static void sunxi_pinctrl_irq_unmask(struct irq_data *d)
 634 {
 635         struct sunxi_pinctrl *pctl = irq_data_get_irq_chip_data(d);
 636         struct sunxi_desc_function *func;
 637         u32 reg = sunxi_irq_ctrl_reg(d->hwirq);
 638         u8 idx = sunxi_irq_ctrl_offset(d->hwirq);
 639         unsigned long flags;
 640         u32 val;
 641
 642         func = sunxi_pinctrl_desc_find_function_by_pin(pctl,
 643                                                        pctl->irq_array[d->hwirq],
 644                                                        "irq");
 645
 646         /* Change muxing to INT mode */
 647         sunxi_pmx_set(pctl->pctl_dev, pctl->irq_array[d->hwirq], func->muxval);
 648
 649         spin_lock_irqsave(&pctl->lock, flags);
 650
 651         /* Unmask the IRQ */
 652         val = readl(pctl->membase + reg);
 653         writel(val | (1 << idx), pctl->membase + reg);
 654
 655         spin_unlock_irqrestore(&pctl->lock, flags);
 656 }
 657
 658 static struct irq_chip sunxi_pinctrl_irq_chip = {
 659         .irq_mask       = sunxi_pinctrl_irq_mask,
 660         .irq_mask_ack   = sunxi_pinctrl_irq_mask_ack,
 661         .irq_unmask     = sunxi_pinctrl_irq_unmask,
 662         .irq_set_type   = sunxi_pinctrl_irq_set_type,
 663 };
 664
 665 static void sunxi_pinctrl_irq_handler(unsigned irq, struct irq_desc *desc)
 666 {
 667         struct sunxi_pinctrl *pctl = irq_get_handler_data(irq);
 668         const unsigned long reg = readl(pctl->membase + IRQ_STATUS_REG);
 669
 670         /* Clear all interrupts */
 671         writel(reg, pctl->membase + IRQ_STATUS_REG);
 672
 673         if (reg) {
 674                 int irqoffset;
 675
 676                 for_each_set_bit(irqoffset, &reg, SUNXI_IRQ_NUMBER) {
 677                         int pin_irq = irq_find_mapping(pctl->domain, irqoffset);
 678                         generic_handle_irq(pin_irq);
 679                 }
 680         }
 681 }
 682
 683 static struct of_device_id sunxi_pinctrl_match[] = {
 684         { .compatible = "allwinner,sun4i-a10-pinctrl", .data = (void *)&sun4i_a10_pinctrl_data },
 685         { .compatible = "allwinner,sun5i-a10s-pinctrl", .data = (void *)&sun5i_a10s_pinctrl_data },
 686         { .compatible = "allwinner,sun5i-a13-pinctrl", .data = (void *)&sun5i_a13_pinctrl_data },
 687         { .compatible = "allwinner,sun6i-a31-pinctrl", .data = (void *)&sun6i_a31_pinctrl_data },
 688         { .compatible = "allwinner,sun7i-a20-pinctrl", .data = (void *)&sun7i_a20_pinctrl_data },
 689         {}
 690 };
 691 MODULE_DEVICE_TABLE(of, sunxi_pinctrl_match);
 692
 693 static int sunxi_pinctrl_add_function(struct sunxi_pinctrl *pctl,
 694                                         const char *name)
 695 {
 696         struct sunxi_pinctrl_function *func = pctl->functions;
 697
 698         while (func->name) {
 699                 /* function already there */
 700                 if (strcmp(func->name, name) == 0) {
 701                         func->ngroups++;
 702                         return -EEXIST;
 703                 }
 704                 func++;
 705         }
 706
 707         func->name = name;
 708         func->ngroups = 1;
 709
 710         pctl->nfunctions++;
 711
 712         return 0;
 713 }
 714
 715 static int sunxi_pinctrl_build_state(struct platform_device *pdev)
 716 {
 717         struct sunxi_pinctrl *pctl = platform_get_drvdata(pdev);
 718         int i;
 719
 720         pctl->ngroups = pctl->desc->npins;
 721
 722         /* Allocate groups */
 723         pctl->groups = devm_kzalloc(&pdev->dev,
 724                                     pctl->ngroups * sizeof(*pctl->groups),
 725                                     GFP_KERNEL);
 726         if (!pctl->groups)
 727                 return -ENOMEM;
 728
 729         for (i = 0; i < pctl->desc->npins; i++) {
 730                 const struct sunxi_desc_pin *pin = pctl->desc->pins + i;
 731                 struct sunxi_pinctrl_group *group = pctl->groups + i;
 732
 733                 group->name = pin->pin.name;
 734                 group->pin = pin->pin.number;
 735         }
 736
 737         /*
 738          * We suppose that we won't have any more functions than pins,
 739          * we'll reallocate that later anyway
 740          */
 741         pctl->functions = devm_kzalloc(&pdev->dev,
 742                                 pctl->desc->npins * sizeof(*pctl->functions),
 743                                 GFP_KERNEL);
 744         if (!pctl->functions)
 745                 return -ENOMEM;
 746
 747         /* Count functions and their associated groups */
 748         for (i = 0; i < pctl->desc->npins; i++) {
 749                 const struct sunxi_desc_pin *pin = pctl->desc->pins + i;
 750                 struct sunxi_desc_function *func = pin->functions;
 751
 752                 while (func->name) {
 753                         sunxi_pinctrl_add_function(pctl, func->name);
 754                         func++;
 755                 }
 756         }
 757
 758         pctl->functions = krealloc(pctl->functions,
 759                                 pctl->nfunctions * sizeof(*pctl->functions),
 760                                 GFP_KERNEL);
 761
 762         for (i = 0; i < pctl->desc->npins; i++) {
 763                 const struct sunxi_desc_pin *pin = pctl->desc->pins + i;
 764                 struct sunxi_desc_function *func = pin->functions;
 765
 766                 while (func->name) {
 767                         struct sunxi_pinctrl_function *func_item;
 768                         const char **func_grp;
 769
 770                         func_item = sunxi_pinctrl_find_function_by_name(pctl,
 771                                                                         func->name);
 772                         if (!func_item)
 773                                 return -EINVAL;
 774
 775                         if (!func_item->groups) {
 776                                 func_item->groups =
 777                                         devm_kzalloc(&pdev->dev,
 778                                                      func_item->ngroups * sizeof(*func_item->groups),
 779                                                      GFP_KERNEL);
 780                                 if (!func_item->groups)
 781                                         return -ENOMEM;
 782                         }
 783
 784                         func_grp = func_item->groups;
 785                         while (*func_grp)
 786                                 func_grp++;
 787
 788                         *func_grp = pin->pin.name;
 789                         func++;
 790                 }
 791         }
 792
 793         return 0;
 794 }
 795
 796 static int sunxi_pinctrl_probe(struct platform_device *pdev)
 797 {
 798         struct device_node *node = pdev->dev.of_node;
 799         const struct of_device_id *device;
 800         struct pinctrl_pin_desc *pins;
 801         struct sunxi_pinctrl *pctl;
 802         int i, ret, last_pin;
 803         struct clk *clk;
 804
 805         pctl = devm_kzalloc(&pdev->dev, sizeof(*pctl), GFP_KERNEL);
 806         if (!pctl)
 807                 return -ENOMEM;
 808         platform_set_drvdata(pdev, pctl);
 809
 810         spin_lock_init(&pctl->lock);
 811
 812         pctl->membase = of_iomap(node, 0);
 813         if (!pctl->membase)
 814                 return -ENOMEM;
 815
 816         device = of_match_device(sunxi_pinctrl_match, &pdev->dev);
 817         if (!device)
 818                 return -ENODEV;
 819
 820         pctl->desc = (struct sunxi_pinctrl_desc *)device->data;
 821
 822         ret = sunxi_pinctrl_build_state(pdev);
 823         if (ret) {
 824                 dev_err(&pdev->dev, "dt probe failed: %d\n", ret);
 825                 return ret;
 826         }
 827
 828         pins = devm_kzalloc(&pdev->dev,
 829                             pctl->desc->npins * sizeof(*pins),
 830                             GFP_KERNEL);
 831         if (!pins)
 832                 return -ENOMEM;
 833
 834         for (i = 0; i < pctl->desc->npins; i++)
 835                 pins[i] = pctl->desc->pins[i].pin;
 836
 837         sunxi_pctrl_desc.name = dev_name(&pdev->dev);
 838         sunxi_pctrl_desc.owner = THIS_MODULE;
 839         sunxi_pctrl_desc.pins = pins;
 840         sunxi_pctrl_desc.npins = pctl->desc->npins;
 841         pctl->dev = &pdev->dev;
 842         pctl->pctl_dev = pinctrl_register(&sunxi_pctrl_desc,
 843                                           &pdev->dev, pctl);
 844         if (!pctl->pctl_dev) {
 845                 dev_err(&pdev->dev, "couldn't register pinctrl driver\n");
 846                 return -EINVAL;
 847         }
 848
 849         pctl->chip = devm_kzalloc(&pdev->dev, sizeof(*pctl->chip), GFP_KERNEL);
 850         if (!pctl->chip) {
 851                 ret = -ENOMEM;
 852                 goto pinctrl_error;
 853         }
 854
 855         last_pin = pctl->desc->pins[pctl->desc->npins - 1].pin.number;
 856         pctl->chip = &sunxi_pinctrl_gpio_chip;
 857         pctl->chip->ngpio = round_up(last_pin, PINS_PER_BANK);
 858         pctl->chip->label = dev_name(&pdev->dev);
 859         pctl->chip->dev = &pdev->dev;
 860         pctl->chip->base = 0;
 861
 862         ret = gpiochip_add(pctl->chip);
 863         if (ret)
 864                 goto pinctrl_error;
 865
 866         for (i = 0; i < pctl->desc->npins; i++) {
 867                 const struct sunxi_desc_pin *pin = pctl->desc->pins + i;
 868
 869                 ret = gpiochip_add_pin_range(pctl->chip, dev_name(&pdev->dev),
 870                                              pin->pin.number,
 871                                              pin->pin.number, 1);
 872                 if (ret)
 873                         goto gpiochip_error;
 874         }
 875
 876         clk = devm_clk_get(&pdev->dev, NULL);
 877         if (IS_ERR(clk)) {
 878                 ret = PTR_ERR(clk);
 879                 goto gpiochip_error;
 880         }
 881
 882         clk_prepare_enable(clk);
 883
 884         pctl->irq = irq_of_parse_and_map(node, 0);
 885         if (!pctl->irq) {
 886                 ret = -EINVAL;
 887                 goto gpiochip_error;
 888         }
 889
 890         pctl->domain = irq_domain_add_linear(node, SUNXI_IRQ_NUMBER,
 891                                              &irq_domain_simple_ops, NULL);
 892         if (!pctl->domain) {
 893                 dev_err(&pdev->dev, "Couldn't register IRQ domain\n");
 894                 ret = -ENOMEM;
 895                 goto gpiochip_error;
 896         }
 897
 898         for (i = 0; i < SUNXI_IRQ_NUMBER; i++) {
 899                 int irqno = irq_create_mapping(pctl->domain, i);
 900
 901                 irq_set_chip_and_handler(irqno, &sunxi_pinctrl_irq_chip,
 902                                          handle_simple_irq);
 903                 irq_set_chip_data(irqno, pctl);
 904         };
 905
 906         irq_set_chained_handler(pctl->irq, sunxi_pinctrl_irq_handler);
 907         irq_set_handler_data(pctl->irq, pctl);
 908
 909         dev_info(&pdev->dev, "initialized sunXi PIO driver\n");
 910
 911         return 0;
 912
 913 gpiochip_error:
 914         if (gpiochip_remove(pctl->chip))
 915                 dev_err(&pdev->dev, "failed to remove gpio chip\n");
 916 pinctrl_error:
 917         pinctrl_unregister(pctl->pctl_dev);
 918         return ret;
 919 }
 920
 921 static struct platform_driver sunxi_pinctrl_driver = {
 922         .probe = sunxi_pinctrl_probe,
 923         .driver = {
 924                 .name = "sunxi-pinctrl",
 925                 .owner = THIS_MODULE,
 926                 .of_match_table = sunxi_pinctrl_match,
 927         },
 928 };
 929 module_platform_driver(sunxi_pinctrl_driver);
 930
 931 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com");
 932 MODULE_DESCRIPTION("Allwinner A1X pinctrl driver");
 933 MODULE_LICENSE("GPL");