Pileus Git - ~andy/linux/blob - drivers/pinctrl/pinctrl-single.c

   1 /*
   2  * Generic device tree based pinctrl driver for one register per pin
   3  * type pinmux controllers
   4  *
   5  * Copyright (C) 2012 Texas Instruments, Inc.
   6  *
   7  * This file is licensed under the terms of the GNU General Public
   8  * License version 2. This program is licensed "as is" without any
   9  * warranty of any kind, whether express or implied.
  10  */
  11
  12 #include <linux/init.h>
  13 #include <linux/module.h>
  14 #include <linux/io.h>
  15 #include <linux/slab.h>
  16 #include <linux/err.h>
  17 #include <linux/list.h>
  18
  19 #include <linux/of.h>
  20 #include <linux/of_device.h>
  21 #include <linux/of_address.h>
  22
  23 #include <linux/pinctrl/pinctrl.h>
  24 #include <linux/pinctrl/pinmux.h>
  25
  26 #include "core.h"
  27
  28 #define DRIVER_NAME                     "pinctrl-single"
  29 #define PCS_MUX_NAME                    "pinctrl-single,pins"
  30 #define PCS_REG_NAME_LEN                ((sizeof(unsigned long) * 2) + 1)
  31 #define PCS_OFF_DISABLED                ~0U
  32
  33 /**
  34  * struct pcs_pingroup - pingroups for a function
  35  * @np:         pingroup device node pointer
  36  * @name:       pingroup name
  37  * @gpins:      array of the pins in the group
  38  * @ngpins:     number of pins in the group
  39  * @node:       list node
  40  */
  41 struct pcs_pingroup {
  42         struct device_node *np;
  43         const char *name;
  44         int *gpins;
  45         int ngpins;
  46         struct list_head node;
  47 };
  48
  49 /**
  50  * struct pcs_func_vals - mux function register offset and value pair
  51  * @reg:        register virtual address
  52  * @val:        register value
  53  */
  54 struct pcs_func_vals {
  55         void __iomem *reg;
  56         unsigned val;
  57 };
  58
  59 /**
  60  * struct pcs_function - pinctrl function
  61  * @name:       pinctrl function name
  62  * @vals:       register and vals array
  63  * @nvals:      number of entries in vals array
  64  * @pgnames:    array of pingroup names the function uses
  65  * @npgnames:   number of pingroup names the function uses
  66  * @node:       list node
  67  */
  68 struct pcs_function {
  69         const char *name;
  70         struct pcs_func_vals *vals;
  71         unsigned nvals;
  72         const char **pgnames;
  73         int npgnames;
  74         struct list_head node;
  75 };
  76
  77 /**
  78  * struct pcs_data - wrapper for data needed by pinctrl framework
  79  * @pa:         pindesc array
  80  * @cur:        index to current element
  81  *
  82  * REVISIT: We should be able to drop this eventually by adding
  83  * support for registering pins individually in the pinctrl
  84  * framework for those drivers that don't need a static array.
  85  */
  86 struct pcs_data {
  87         struct pinctrl_pin_desc *pa;
  88         int cur;
  89 };
  90
  91 /**
  92  * struct pcs_name - register name for a pin
  93  * @name:       name of the pinctrl register
  94  *
  95  * REVISIT: We may want to make names optional in the pinctrl
  96  * framework as some drivers may not care about pin names to
  97  * avoid kernel bloat. The pin names can be deciphered by user
  98  * space tools using debugfs based on the register address and
  99  * SoC packaging information.
 100  */
 101 struct pcs_name {
 102         char name[PCS_REG_NAME_LEN];
 103 };
 104
 105 /**
 106  * struct pcs_device - pinctrl device instance
 107  * @res:        resources
 108  * @base:       virtual address of the controller
 109  * @size:       size of the ioremapped area
 110  * @dev:        device entry
 111  * @pctl:       pin controller device
 112  * @mutex:      mutex protecting the lists
 113  * @width:      bits per mux register
 114  * @fmask:      function register mask
 115  * @fshift:     function register shift
 116  * @foff:       value to turn mux off
 117  * @fmax:       max number of functions in fmask
 118  * @names:      array of register names for pins
 119  * @pins:       physical pins on the SoC
 120  * @pgtree:     pingroup index radix tree
 121  * @ftree:      function index radix tree
 122  * @pingroups:  list of pingroups
 123  * @functions:  list of functions
 124  * @ngroups:    number of pingroups
 125  * @nfuncs:     number of functions
 126  * @desc:       pin controller descriptor
 127  * @read:       register read function to use
 128  * @write:      register write function to use
 129  */
 130 struct pcs_device {
 131         struct resource *res;
 132         void __iomem *base;
 133         unsigned size;
 134         struct device *dev;
 135         struct pinctrl_dev *pctl;
 136         struct mutex mutex;
 137         unsigned width;
 138         unsigned fmask;
 139         unsigned fshift;
 140         unsigned foff;
 141         unsigned fmax;
 142         struct pcs_name *names;
 143         struct pcs_data pins;
 144         struct radix_tree_root pgtree;
 145         struct radix_tree_root ftree;
 146         struct list_head pingroups;
 147         struct list_head functions;
 148         unsigned ngroups;
 149         unsigned nfuncs;
 150         struct pinctrl_desc desc;
 151         unsigned (*read)(void __iomem *reg);
 152         void (*write)(unsigned val, void __iomem *reg);
 153 };
 154
 155 /*
 156  * REVISIT: Reads and writes could eventually use regmap or something
 157  * generic. But at least on omaps, some mux registers are performance
 158  * critical as they may need to be remuxed every time before and after
 159  * idle. Adding tests for register access width for every read and
 160  * write like regmap is doing is not desired, and caching the registers
 161  * does not help in this case.
 162  */
 163
 164 static unsigned __maybe_unused pcs_readb(void __iomem *reg)
 165 {
 166         return readb(reg);
 167 }
 168
 169 static unsigned __maybe_unused pcs_readw(void __iomem *reg)
 170 {
 171         return readw(reg);
 172 }
 173
 174 static unsigned __maybe_unused pcs_readl(void __iomem *reg)
 175 {
 176         return readl(reg);
 177 }
 178
 179 static void __maybe_unused pcs_writeb(unsigned val, void __iomem *reg)
 180 {
 181         writeb(val, reg);
 182 }
 183
 184 static void __maybe_unused pcs_writew(unsigned val, void __iomem *reg)
 185 {
 186         writew(val, reg);
 187 }
 188
 189 static void __maybe_unused pcs_writel(unsigned val, void __iomem *reg)
 190 {
 191         writel(val, reg);
 192 }
 193
 194 static int pcs_get_groups_count(struct pinctrl_dev *pctldev)
 195 {
 196         struct pcs_device *pcs;
 197
 198         pcs = pinctrl_dev_get_drvdata(pctldev);
 199
 200         return pcs->ngroups;
 201 }
 202
 203 static const char *pcs_get_group_name(struct pinctrl_dev *pctldev,
 204                                         unsigned gselector)
 205 {
 206         struct pcs_device *pcs;
 207         struct pcs_pingroup *group;
 208
 209         pcs = pinctrl_dev_get_drvdata(pctldev);
 210         group = radix_tree_lookup(&pcs->pgtree, gselector);
 211         if (!group) {
 212                 dev_err(pcs->dev, "%s could not find pingroup%i\n",
 213                         __func__, gselector);
 214                 return NULL;
 215         }
 216
 217         return group->name;
 218 }
 219
 220 static int pcs_get_group_pins(struct pinctrl_dev *pctldev,
 221                                         unsigned gselector,
 222                                         const unsigned **pins,
 223                                         unsigned *npins)
 224 {
 225         struct pcs_device *pcs;
 226         struct pcs_pingroup *group;
 227
 228         pcs = pinctrl_dev_get_drvdata(pctldev);
 229         group = radix_tree_lookup(&pcs->pgtree, gselector);
 230         if (!group) {
 231                 dev_err(pcs->dev, "%s could not find pingroup%i\n",
 232                         __func__, gselector);
 233                 return -EINVAL;
 234         }
 235
 236         *pins = group->gpins;
 237         *npins = group->ngpins;
 238
 239         return 0;
 240 }
 241
 242 static void pcs_pin_dbg_show(struct pinctrl_dev *pctldev,
 243                                         struct seq_file *s,
 244                                         unsigned offset)
 245 {
 246         seq_printf(s, " " DRIVER_NAME);
 247 }
 248
 249 static void pcs_dt_free_map(struct pinctrl_dev *pctldev,
 250                                 struct pinctrl_map *map, unsigned num_maps)
 251 {
 252         struct pcs_device *pcs;
 253
 254         pcs = pinctrl_dev_get_drvdata(pctldev);
 255         devm_kfree(pcs->dev, map);
 256 }
 257
 258 static int pcs_dt_node_to_map(struct pinctrl_dev *pctldev,
 259                                 struct device_node *np_config,
 260                                 struct pinctrl_map **map, unsigned *num_maps);
 261
 262 static struct pinctrl_ops pcs_pinctrl_ops = {
 263         .get_groups_count = pcs_get_groups_count,
 264         .get_group_name = pcs_get_group_name,
 265         .get_group_pins = pcs_get_group_pins,
 266         .pin_dbg_show = pcs_pin_dbg_show,
 267         .dt_node_to_map = pcs_dt_node_to_map,
 268         .dt_free_map = pcs_dt_free_map,
 269 };
 270
 271 static int pcs_get_functions_count(struct pinctrl_dev *pctldev)
 272 {
 273         struct pcs_device *pcs;
 274
 275         pcs = pinctrl_dev_get_drvdata(pctldev);
 276
 277         return pcs->nfuncs;
 278 }
 279
 280 static const char *pcs_get_function_name(struct pinctrl_dev *pctldev,
 281                                                 unsigned fselector)
 282 {
 283         struct pcs_device *pcs;
 284         struct pcs_function *func;
 285
 286         pcs = pinctrl_dev_get_drvdata(pctldev);
 287         func = radix_tree_lookup(&pcs->ftree, fselector);
 288         if (!func) {
 289                 dev_err(pcs->dev, "%s could not find function%i\n",
 290                         __func__, fselector);
 291                 return NULL;
 292         }
 293
 294         return func->name;
 295 }
 296
 297 static int pcs_get_function_groups(struct pinctrl_dev *pctldev,
 298                                         unsigned fselector,
 299                                         const char * const **groups,
 300                                         unsigned * const ngroups)
 301 {
 302         struct pcs_device *pcs;
 303         struct pcs_function *func;
 304
 305         pcs = pinctrl_dev_get_drvdata(pctldev);
 306         func = radix_tree_lookup(&pcs->ftree, fselector);
 307         if (!func) {
 308                 dev_err(pcs->dev, "%s could not find function%i\n",
 309                         __func__, fselector);
 310                 return -EINVAL;
 311         }
 312         *groups = func->pgnames;
 313         *ngroups = func->npgnames;
 314
 315         return 0;
 316 }
 317
 318 static int pcs_enable(struct pinctrl_dev *pctldev, unsigned fselector,
 319         unsigned group)
 320 {
 321         struct pcs_device *pcs;
 322         struct pcs_function *func;
 323         int i;
 324
 325         pcs = pinctrl_dev_get_drvdata(pctldev);
 326         func = radix_tree_lookup(&pcs->ftree, fselector);
 327         if (!func)
 328                 return -EINVAL;
 329
 330         dev_dbg(pcs->dev, "enabling %s function%i\n",
 331                 func->name, fselector);
 332
 333         for (i = 0; i < func->nvals; i++) {
 334                 struct pcs_func_vals *vals;
 335                 unsigned val;
 336
 337                 vals = &func->vals[i];
 338                 val = pcs->read(vals->reg);
 339                 val &= ~pcs->fmask;
 340                 val |= vals->val;
 341                 pcs->write(val, vals->reg);
 342         }
 343
 344         return 0;
 345 }
 346
 347 static void pcs_disable(struct pinctrl_dev *pctldev, unsigned fselector,
 348                                         unsigned group)
 349 {
 350         struct pcs_device *pcs;
 351         struct pcs_function *func;
 352         int i;
 353
 354         pcs = pinctrl_dev_get_drvdata(pctldev);
 355         func = radix_tree_lookup(&pcs->ftree, fselector);
 356         if (!func) {
 357                 dev_err(pcs->dev, "%s could not find function%i\n",
 358                         __func__, fselector);
 359                 return;
 360         }
 361
 362         /*
 363          * Ignore disable if function-off is not specified. Some hardware
 364          * does not have clearly defined disable function. For pin specific
 365          * off modes, you can use alternate named states as described in
 366          * pinctrl-bindings.txt.
 367          */
 368         if (pcs->foff == PCS_OFF_DISABLED) {
 369                 dev_dbg(pcs->dev, "ignoring disable for %s function%i\n",
 370                         func->name, fselector);
 371                 return;
 372         }
 373
 374         dev_dbg(pcs->dev, "disabling function%i %s\n",
 375                 fselector, func->name);
 376
 377         for (i = 0; i < func->nvals; i++) {
 378                 struct pcs_func_vals *vals;
 379                 unsigned val;
 380
 381                 vals = &func->vals[i];
 382                 val = pcs->read(vals->reg);
 383                 val &= ~pcs->fmask;
 384                 val |= pcs->foff << pcs->fshift;
 385                 pcs->write(val, vals->reg);
 386         }
 387 }
 388
 389 static int pcs_request_gpio(struct pinctrl_dev *pctldev,
 390                         struct pinctrl_gpio_range *range, unsigned offset)
 391 {
 392         return -ENOTSUPP;
 393 }
 394
 395 static struct pinmux_ops pcs_pinmux_ops = {
 396         .get_functions_count = pcs_get_functions_count,
 397         .get_function_name = pcs_get_function_name,
 398         .get_function_groups = pcs_get_function_groups,
 399         .enable = pcs_enable,
 400         .disable = pcs_disable,
 401         .gpio_request_enable = pcs_request_gpio,
 402 };
 403
 404 static int pcs_pinconf_get(struct pinctrl_dev *pctldev,
 405                                 unsigned pin, unsigned long *config)
 406 {
 407         return -ENOTSUPP;
 408 }
 409
 410 static int pcs_pinconf_set(struct pinctrl_dev *pctldev,
 411                                 unsigned pin, unsigned long config)
 412 {
 413         return -ENOTSUPP;
 414 }
 415
 416 static int pcs_pinconf_group_get(struct pinctrl_dev *pctldev,
 417                                 unsigned group, unsigned long *config)
 418 {
 419         return -ENOTSUPP;
 420 }
 421
 422 static int pcs_pinconf_group_set(struct pinctrl_dev *pctldev,
 423                                 unsigned group, unsigned long config)
 424 {
 425         return -ENOTSUPP;
 426 }
 427
 428 static void pcs_pinconf_dbg_show(struct pinctrl_dev *pctldev,
 429                                 struct seq_file *s, unsigned offset)
 430 {
 431 }
 432
 433 static void pcs_pinconf_group_dbg_show(struct pinctrl_dev *pctldev,
 434                                 struct seq_file *s, unsigned selector)
 435 {
 436 }
 437
 438 static struct pinconf_ops pcs_pinconf_ops = {
 439         .pin_config_get = pcs_pinconf_get,
 440         .pin_config_set = pcs_pinconf_set,
 441         .pin_config_group_get = pcs_pinconf_group_get,
 442         .pin_config_group_set = pcs_pinconf_group_set,
 443         .pin_config_dbg_show = pcs_pinconf_dbg_show,
 444         .pin_config_group_dbg_show = pcs_pinconf_group_dbg_show,
 445 };
 446
 447 /**
 448  * pcs_add_pin() - add a pin to the static per controller pin array
 449  * @pcs: pcs driver instance
 450  * @offset: register offset from base
 451  */
 452 static int __devinit pcs_add_pin(struct pcs_device *pcs, unsigned offset)
 453 {
 454         struct pinctrl_pin_desc *pin;
 455         struct pcs_name *pn;
 456         int i;
 457
 458         i = pcs->pins.cur;
 459         if (i >= pcs->desc.npins) {
 460                 dev_err(pcs->dev, "too many pins, max %i\n",
 461                         pcs->desc.npins);
 462                 return -ENOMEM;
 463         }
 464
 465         pin = &pcs->pins.pa[i];
 466         pn = &pcs->names[i];
 467         sprintf(pn->name, "%lx",
 468                 (unsigned long)pcs->res->start + offset);
 469         pin->name = pn->name;
 470         pin->number = i;
 471         pcs->pins.cur++;
 472
 473         return i;
 474 }
 475
 476 /**
 477  * pcs_allocate_pin_table() - adds all the pins for the pinctrl driver
 478  * @pcs: pcs driver instance
 479  *
 480  * In case of errors, resources are freed in pcs_free_resources.
 481  *
 482  * If your hardware needs holes in the address space, then just set
 483  * up multiple driver instances.
 484  */
 485 static int __devinit pcs_allocate_pin_table(struct pcs_device *pcs)
 486 {
 487         int mux_bytes, nr_pins, i;
 488
 489         mux_bytes = pcs->width / BITS_PER_BYTE;
 490         nr_pins = pcs->size / mux_bytes;
 491
 492         dev_dbg(pcs->dev, "allocating %i pins\n", nr_pins);
 493         pcs->pins.pa = devm_kzalloc(pcs->dev,
 494                                 sizeof(*pcs->pins.pa) * nr_pins,
 495                                 GFP_KERNEL);
 496         if (!pcs->pins.pa)
 497                 return -ENOMEM;
 498
 499         pcs->names = devm_kzalloc(pcs->dev,
 500                                 sizeof(struct pcs_name) * nr_pins,
 501                                 GFP_KERNEL);
 502         if (!pcs->names)
 503                 return -ENOMEM;
 504
 505         pcs->desc.pins = pcs->pins.pa;
 506         pcs->desc.npins = nr_pins;
 507
 508         for (i = 0; i < pcs->desc.npins; i++) {
 509                 unsigned offset;
 510                 int res;
 511
 512                 offset = i * mux_bytes;
 513                 res = pcs_add_pin(pcs, offset);
 514                 if (res < 0) {
 515                         dev_err(pcs->dev, "error adding pins: %i\n", res);
 516                         return res;
 517                 }
 518         }
 519
 520         return 0;
 521 }
 522
 523 /**
 524  * pcs_add_function() - adds a new function to the function list
 525  * @pcs: pcs driver instance
 526  * @np: device node of the mux entry
 527  * @name: name of the function
 528  * @vals: array of mux register value pairs used by the function
 529  * @nvals: number of mux register value pairs
 530  * @pgnames: array of pingroup names for the function
 531  * @npgnames: number of pingroup names
 532  */
 533 static struct pcs_function *pcs_add_function(struct pcs_device *pcs,
 534                                         struct device_node *np,
 535                                         const char *name,
 536                                         struct pcs_func_vals *vals,
 537                                         unsigned nvals,
 538                                         const char **pgnames,
 539                                         unsigned npgnames)
 540 {
 541         struct pcs_function *function;
 542
 543         function = devm_kzalloc(pcs->dev, sizeof(*function), GFP_KERNEL);
 544         if (!function)
 545                 return NULL;
 546
 547         function->name = name;
 548         function->vals = vals;
 549         function->nvals = nvals;
 550         function->pgnames = pgnames;
 551         function->npgnames = npgnames;
 552
 553         mutex_lock(&pcs->mutex);
 554         list_add_tail(&function->node, &pcs->functions);
 555         radix_tree_insert(&pcs->ftree, pcs->nfuncs, function);
 556         pcs->nfuncs++;
 557         mutex_unlock(&pcs->mutex);
 558
 559         return function;
 560 }
 561
 562 static void pcs_remove_function(struct pcs_device *pcs,
 563                                 struct pcs_function *function)
 564 {
 565         int i;
 566
 567         mutex_lock(&pcs->mutex);
 568         for (i = 0; i < pcs->nfuncs; i++) {
 569                 struct pcs_function *found;
 570
 571                 found = radix_tree_lookup(&pcs->ftree, i);
 572                 if (found == function)
 573                         radix_tree_delete(&pcs->ftree, i);
 574         }
 575         list_del(&function->node);
 576         mutex_unlock(&pcs->mutex);
 577 }
 578
 579 /**
 580  * pcs_add_pingroup() - add a pingroup to the pingroup list
 581  * @pcs: pcs driver instance
 582  * @np: device node of the mux entry
 583  * @name: name of the pingroup
 584  * @gpins: array of the pins that belong to the group
 585  * @ngpins: number of pins in the group
 586  */
 587 static int pcs_add_pingroup(struct pcs_device *pcs,
 588                                         struct device_node *np,
 589                                         const char *name,
 590                                         int *gpins,
 591                                         int ngpins)
 592 {
 593         struct pcs_pingroup *pingroup;
 594
 595         pingroup = devm_kzalloc(pcs->dev, sizeof(*pingroup), GFP_KERNEL);
 596         if (!pingroup)
 597                 return -ENOMEM;
 598
 599         pingroup->name = name;
 600         pingroup->np = np;
 601         pingroup->gpins = gpins;
 602         pingroup->ngpins = ngpins;
 603
 604         mutex_lock(&pcs->mutex);
 605         list_add_tail(&pingroup->node, &pcs->pingroups);
 606         radix_tree_insert(&pcs->pgtree, pcs->ngroups, pingroup);
 607         pcs->ngroups++;
 608         mutex_unlock(&pcs->mutex);
 609
 610         return 0;
 611 }
 612
 613 /**
 614  * pcs_get_pin_by_offset() - get a pin index based on the register offset
 615  * @pcs: pcs driver instance
 616  * @offset: register offset from the base
 617  *
 618  * Note that this is OK as long as the pins are in a static array.
 619  */
 620 static int pcs_get_pin_by_offset(struct pcs_device *pcs, unsigned offset)
 621 {
 622         unsigned index;
 623
 624         if (offset >= pcs->size) {
 625                 dev_err(pcs->dev, "mux offset out of range: 0x%x (0x%x)\n",
 626                         offset, pcs->size);
 627                 return -EINVAL;
 628         }
 629
 630         index = offset / (pcs->width / BITS_PER_BYTE);
 631
 632         return index;
 633 }
 634
 635 /**
 636  * smux_parse_one_pinctrl_entry() - parses a device tree mux entry
 637  * @pcs: pinctrl driver instance
 638  * @np: device node of the mux entry
 639  * @map: map entry
 640  * @pgnames: pingroup names
 641  *
 642  * Note that this binding currently supports only sets of one register + value.
 643  *
 644  * Also note that this driver tries to avoid understanding pin and function
 645  * names because of the extra bloat they would cause especially in the case of
 646  * a large number of pins. This driver just sets what is specified for the board
 647  * in the .dts file. Further user space debugging tools can be developed to
 648  * decipher the pin and function names using debugfs.
 649  *
 650  * If you are concerned about the boot time, set up the static pins in
 651  * the bootloader, and only set up selected pins as device tree entries.
 652  */
 653 static int pcs_parse_one_pinctrl_entry(struct pcs_device *pcs,
 654                                                 struct device_node *np,
 655                                                 struct pinctrl_map **map,
 656                                                 const char **pgnames)
 657 {
 658         struct pcs_func_vals *vals;
 659         const __be32 *mux;
 660         int size, rows, *pins, index = 0, found = 0, res = -ENOMEM;
 661         struct pcs_function *function;
 662
 663         mux = of_get_property(np, PCS_MUX_NAME, &size);
 664         if ((!mux) || (size < sizeof(*mux) * 2)) {
 665                 dev_err(pcs->dev, "bad data for mux %s\n",
 666                         np->name);
 667                 return -EINVAL;
 668         }
 669
 670         size /= sizeof(*mux);   /* Number of elements in array */
 671         rows = size / 2;        /* Each row is a key value pair */
 672
 673         vals = devm_kzalloc(pcs->dev, sizeof(*vals) * rows, GFP_KERNEL);
 674         if (!vals)
 675                 return -ENOMEM;
 676
 677         pins = devm_kzalloc(pcs->dev, sizeof(*pins) * rows, GFP_KERNEL);
 678         if (!pins)
 679                 goto free_vals;
 680
 681         while (index < size) {
 682                 unsigned offset, val;
 683                 int pin;
 684
 685                 offset = be32_to_cpup(mux + index++);
 686                 val = be32_to_cpup(mux + index++);
 687                 vals[found].reg = pcs->base + offset;
 688                 vals[found].val = val;
 689
 690                 pin = pcs_get_pin_by_offset(pcs, offset);
 691                 if (pin < 0) {
 692                         dev_err(pcs->dev,
 693                                 "could not add functions for %s %ux\n",
 694                                 np->name, offset);
 695                         break;
 696                 }
 697                 pins[found++] = pin;
 698         }
 699
 700         pgnames[0] = np->name;
 701         function = pcs_add_function(pcs, np, np->name, vals, found, pgnames, 1);
 702         if (!function)
 703                 goto free_pins;
 704
 705         res = pcs_add_pingroup(pcs, np, np->name, pins, found);
 706         if (res < 0)
 707                 goto free_function;
 708
 709         (*map)->type = PIN_MAP_TYPE_MUX_GROUP;
 710         (*map)->data.mux.group = np->name;
 711         (*map)->data.mux.function = np->name;
 712
 713         return 0;
 714
 715 free_function:
 716         pcs_remove_function(pcs, function);
 717
 718 free_pins:
 719         devm_kfree(pcs->dev, pins);
 720
 721 free_vals:
 722         devm_kfree(pcs->dev, vals);
 723
 724         return res;
 725 }
 726 /**
 727  * pcs_dt_node_to_map() - allocates and parses pinctrl maps
 728  * @pctldev: pinctrl instance
 729  * @np_config: device tree pinmux entry
 730  * @map: array of map entries
 731  * @num_maps: number of maps
 732  */
 733 static int pcs_dt_node_to_map(struct pinctrl_dev *pctldev,
 734                                 struct device_node *np_config,
 735                                 struct pinctrl_map **map, unsigned *num_maps)
 736 {
 737         struct pcs_device *pcs;
 738         const char **pgnames;
 739         int ret;
 740
 741         pcs = pinctrl_dev_get_drvdata(pctldev);
 742
 743         *map = devm_kzalloc(pcs->dev, sizeof(**map), GFP_KERNEL);
 744         if (!map)
 745                 return -ENOMEM;
 746
 747         *num_maps = 0;
 748
 749         pgnames = devm_kzalloc(pcs->dev, sizeof(*pgnames), GFP_KERNEL);
 750         if (!pgnames) {
 751                 ret = -ENOMEM;
 752                 goto free_map;
 753         }
 754
 755         ret = pcs_parse_one_pinctrl_entry(pcs, np_config, map, pgnames);
 756         if (ret < 0) {
 757                 dev_err(pcs->dev, "no pins entries for %s\n",
 758                         np_config->name);
 759                 goto free_pgnames;
 760         }
 761         *num_maps = 1;
 762
 763         return 0;
 764
 765 free_pgnames:
 766         devm_kfree(pcs->dev, pgnames);
 767 free_map:
 768         devm_kfree(pcs->dev, *map);
 769
 770         return ret;
 771 }
 772
 773 /**
 774  * pcs_free_funcs() - free memory used by functions
 775  * @pcs: pcs driver instance
 776  */
 777 static void pcs_free_funcs(struct pcs_device *pcs)
 778 {
 779         struct list_head *pos, *tmp;
 780         int i;
 781
 782         mutex_lock(&pcs->mutex);
 783         for (i = 0; i < pcs->nfuncs; i++) {
 784                 struct pcs_function *func;
 785
 786                 func = radix_tree_lookup(&pcs->ftree, i);
 787                 if (!func)
 788                         continue;
 789                 radix_tree_delete(&pcs->ftree, i);
 790         }
 791         list_for_each_safe(pos, tmp, &pcs->functions) {
 792                 struct pcs_function *function;
 793
 794                 function = list_entry(pos, struct pcs_function, node);
 795                 list_del(&function->node);
 796         }
 797         mutex_unlock(&pcs->mutex);
 798 }
 799
 800 /**
 801  * pcs_free_pingroups() - free memory used by pingroups
 802  * @pcs: pcs driver instance
 803  */
 804 static void pcs_free_pingroups(struct pcs_device *pcs)
 805 {
 806         struct list_head *pos, *tmp;
 807         int i;
 808
 809         mutex_lock(&pcs->mutex);
 810         for (i = 0; i < pcs->ngroups; i++) {
 811                 struct pcs_pingroup *pingroup;
 812
 813                 pingroup = radix_tree_lookup(&pcs->pgtree, i);
 814                 if (!pingroup)
 815                         continue;
 816                 radix_tree_delete(&pcs->pgtree, i);
 817         }
 818         list_for_each_safe(pos, tmp, &pcs->pingroups) {
 819                 struct pcs_pingroup *pingroup;
 820
 821                 pingroup = list_entry(pos, struct pcs_pingroup, node);
 822                 list_del(&pingroup->node);
 823         }
 824         mutex_unlock(&pcs->mutex);
 825 }
 826
 827 /**
 828  * pcs_free_resources() - free memory used by this driver
 829  * @pcs: pcs driver instance
 830  */
 831 static void pcs_free_resources(struct pcs_device *pcs)
 832 {
 833         if (pcs->pctl)
 834                 pinctrl_unregister(pcs->pctl);
 835
 836         pcs_free_funcs(pcs);
 837         pcs_free_pingroups(pcs);
 838 }
 839
 840 #define PCS_GET_PROP_U32(name, reg, err)                                \
 841         do {                                                            \
 842                 ret = of_property_read_u32(np, name, reg);              \
 843                 if (ret) {                                              \
 844                         dev_err(pcs->dev, err);                         \
 845                         return ret;                                     \
 846                 }                                                       \
 847         } while (0);
 848
 849 static struct of_device_id pcs_of_match[];
 850
 851 static int __devinit pcs_probe(struct platform_device *pdev)
 852 {
 853         struct device_node *np = pdev->dev.of_node;
 854         const struct of_device_id *match;
 855         struct resource *res;
 856         struct pcs_device *pcs;
 857         int ret;
 858
 859         match = of_match_device(pcs_of_match, &pdev->dev);
 860         if (!match)
 861                 return -EINVAL;
 862
 863         pcs = devm_kzalloc(&pdev->dev, sizeof(*pcs), GFP_KERNEL);
 864         if (!pcs) {
 865                 dev_err(&pdev->dev, "could not allocate\n");
 866                 return -ENOMEM;
 867         }
 868         pcs->dev = &pdev->dev;
 869         mutex_init(&pcs->mutex);
 870         INIT_LIST_HEAD(&pcs->pingroups);
 871         INIT_LIST_HEAD(&pcs->functions);
 872
 873         PCS_GET_PROP_U32("pinctrl-single,register-width", &pcs->width,
 874                          "register width not specified\n");
 875
 876         PCS_GET_PROP_U32("pinctrl-single,function-mask", &pcs->fmask,
 877                          "function register mask not specified\n");
 878         pcs->fshift = ffs(pcs->fmask) - 1;
 879         pcs->fmax = pcs->fmask >> pcs->fshift;
 880
 881         ret = of_property_read_u32(np, "pinctrl-single,function-off",
 882                                         &pcs->foff);
 883         if (ret)
 884                 pcs->foff = PCS_OFF_DISABLED;
 885
 886         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 887         if (!res) {
 888                 dev_err(pcs->dev, "could not get resource\n");
 889                 return -ENODEV;
 890         }
 891
 892         pcs->res = devm_request_mem_region(pcs->dev, res->start,
 893                         resource_size(res), DRIVER_NAME);
 894         if (!pcs->res) {
 895                 dev_err(pcs->dev, "could not get mem_region\n");
 896                 return -EBUSY;
 897         }
 898
 899         pcs->size = resource_size(pcs->res);
 900         pcs->base = devm_ioremap(pcs->dev, pcs->res->start, pcs->size);
 901         if (!pcs->base) {
 902                 dev_err(pcs->dev, "could not ioremap\n");
 903                 return -ENODEV;
 904         }
 905
 906         INIT_RADIX_TREE(&pcs->pgtree, GFP_KERNEL);
 907         INIT_RADIX_TREE(&pcs->ftree, GFP_KERNEL);
 908         platform_set_drvdata(pdev, pcs);
 909
 910         switch (pcs->width) {
 911         case 8:
 912                 pcs->read = pcs_readb;
 913                 pcs->write = pcs_writeb;
 914                 break;
 915         case 16:
 916                 pcs->read = pcs_readw;
 917                 pcs->write = pcs_writew;
 918                 break;
 919         case 32:
 920                 pcs->read = pcs_readl;
 921                 pcs->write = pcs_writel;
 922                 break;
 923         default:
 924                 break;
 925         }
 926
 927         pcs->desc.name = DRIVER_NAME;
 928         pcs->desc.pctlops = &pcs_pinctrl_ops;
 929         pcs->desc.pmxops = &pcs_pinmux_ops;
 930         pcs->desc.confops = &pcs_pinconf_ops;
 931         pcs->desc.owner = THIS_MODULE;
 932
 933         ret = pcs_allocate_pin_table(pcs);
 934         if (ret < 0)
 935                 goto free;
 936
 937         pcs->pctl = pinctrl_register(&pcs->desc, pcs->dev, pcs);
 938         if (!pcs->pctl) {
 939                 dev_err(pcs->dev, "could not register single pinctrl driver\n");
 940                 ret = -EINVAL;
 941                 goto free;
 942         }
 943
 944         dev_info(pcs->dev, "%i pins at pa %p size %u\n",
 945                  pcs->desc.npins, pcs->base, pcs->size);
 946
 947         return 0;
 948
 949 free:
 950         pcs_free_resources(pcs);
 951
 952         return ret;
 953 }
 954
 955 static int __devexit pcs_remove(struct platform_device *pdev)
 956 {
 957         struct pcs_device *pcs = platform_get_drvdata(pdev);
 958
 959         if (!pcs)
 960                 return 0;
 961
 962         pcs_free_resources(pcs);
 963
 964         return 0;
 965 }
 966
 967 static struct of_device_id pcs_of_match[] __devinitdata = {
 968         { .compatible = DRIVER_NAME, },
 969         { },
 970 };
 971 MODULE_DEVICE_TABLE(of, pcs_of_match);
 972
 973 static struct platform_driver pcs_driver = {
 974         .probe          = pcs_probe,
 975         .remove         = __devexit_p(pcs_remove),
 976         .driver = {
 977                 .owner          = THIS_MODULE,
 978                 .name           = DRIVER_NAME,
 979                 .of_match_table = pcs_of_match,
 980         },
 981 };
 982
 983 module_platform_driver(pcs_driver);
 984
 985 MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
 986 MODULE_DESCRIPTION("One-register-per-pin type device tree based pinctrl driver");
 987 MODULE_LICENSE("GPL v2");