linux/drivers/pinctrl/pinctrl-single.c
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   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_PINS_NAME               "pinctrl-single,pins"
  30#define PCS_MUX_BITS_NAME               "pinctrl-single,bits"
  31#define PCS_REG_NAME_LEN                ((sizeof(unsigned long) * 2) + 1)
  32#define PCS_OFF_DISABLED                ~0U
  33
  34/**
  35 * struct pcs_pingroup - pingroups for a function
  36 * @np:         pingroup device node pointer
  37 * @name:       pingroup name
  38 * @gpins:      array of the pins in the group
  39 * @ngpins:     number of pins in the group
  40 * @node:       list node
  41 */
  42struct pcs_pingroup {
  43        struct device_node *np;
  44        const char *name;
  45        int *gpins;
  46        int ngpins;
  47        struct list_head node;
  48};
  49
  50/**
  51 * struct pcs_func_vals - mux function register offset and value pair
  52 * @reg:        register virtual address
  53 * @val:        register value
  54 */
  55struct pcs_func_vals {
  56        void __iomem *reg;
  57        unsigned val;
  58        unsigned mask;
  59};
  60
  61/**
  62 * struct pcs_function - pinctrl function
  63 * @name:       pinctrl function name
  64 * @vals:       register and vals array
  65 * @nvals:      number of entries in vals array
  66 * @pgnames:    array of pingroup names the function uses
  67 * @npgnames:   number of pingroup names the function uses
  68 * @node:       list node
  69 */
  70struct pcs_function {
  71        const char *name;
  72        struct pcs_func_vals *vals;
  73        unsigned nvals;
  74        const char **pgnames;
  75        int npgnames;
  76        struct list_head node;
  77};
  78
  79/**
  80 * struct pcs_data - wrapper for data needed by pinctrl framework
  81 * @pa:         pindesc array
  82 * @cur:        index to current element
  83 *
  84 * REVISIT: We should be able to drop this eventually by adding
  85 * support for registering pins individually in the pinctrl
  86 * framework for those drivers that don't need a static array.
  87 */
  88struct pcs_data {
  89        struct pinctrl_pin_desc *pa;
  90        int cur;
  91};
  92
  93/**
  94 * struct pcs_name - register name for a pin
  95 * @name:       name of the pinctrl register
  96 *
  97 * REVISIT: We may want to make names optional in the pinctrl
  98 * framework as some drivers may not care about pin names to
  99 * avoid kernel bloat. The pin names can be deciphered by user
 100 * space tools using debugfs based on the register address and
 101 * SoC packaging information.
 102 */
 103struct pcs_name {
 104        char name[PCS_REG_NAME_LEN];
 105};
 106
 107/**
 108 * struct pcs_device - pinctrl device instance
 109 * @res:        resources
 110 * @base:       virtual address of the controller
 111 * @size:       size of the ioremapped area
 112 * @dev:        device entry
 113 * @pctl:       pin controller device
 114 * @mutex:      mutex protecting the lists
 115 * @width:      bits per mux register
 116 * @fmask:      function register mask
 117 * @fshift:     function register shift
 118 * @foff:       value to turn mux off
 119 * @fmax:       max number of functions in fmask
 120 * @names:      array of register names for pins
 121 * @pins:       physical pins on the SoC
 122 * @pgtree:     pingroup index radix tree
 123 * @ftree:      function index radix tree
 124 * @pingroups:  list of pingroups
 125 * @functions:  list of functions
 126 * @ngroups:    number of pingroups
 127 * @nfuncs:     number of functions
 128 * @desc:       pin controller descriptor
 129 * @read:       register read function to use
 130 * @write:      register write function to use
 131 */
 132struct pcs_device {
 133        struct resource *res;
 134        void __iomem *base;
 135        unsigned size;
 136        struct device *dev;
 137        struct pinctrl_dev *pctl;
 138        struct mutex mutex;
 139        unsigned width;
 140        unsigned fmask;
 141        unsigned fshift;
 142        unsigned foff;
 143        unsigned fmax;
 144        bool bits_per_mux;
 145        struct pcs_name *names;
 146        struct pcs_data pins;
 147        struct radix_tree_root pgtree;
 148        struct radix_tree_root ftree;
 149        struct list_head pingroups;
 150        struct list_head functions;
 151        unsigned ngroups;
 152        unsigned nfuncs;
 153        struct pinctrl_desc desc;
 154        unsigned (*read)(void __iomem *reg);
 155        void (*write)(unsigned val, void __iomem *reg);
 156};
 157
 158/*
 159 * REVISIT: Reads and writes could eventually use regmap or something
 160 * generic. But at least on omaps, some mux registers are performance
 161 * critical as they may need to be remuxed every time before and after
 162 * idle. Adding tests for register access width for every read and
 163 * write like regmap is doing is not desired, and caching the registers
 164 * does not help in this case.
 165 */
 166
 167static unsigned __maybe_unused pcs_readb(void __iomem *reg)
 168{
 169        return readb(reg);
 170}
 171
 172static unsigned __maybe_unused pcs_readw(void __iomem *reg)
 173{
 174        return readw(reg);
 175}
 176
 177static unsigned __maybe_unused pcs_readl(void __iomem *reg)
 178{
 179        return readl(reg);
 180}
 181
 182static void __maybe_unused pcs_writeb(unsigned val, void __iomem *reg)
 183{
 184        writeb(val, reg);
 185}
 186
 187static void __maybe_unused pcs_writew(unsigned val, void __iomem *reg)
 188{
 189        writew(val, reg);
 190}
 191
 192static void __maybe_unused pcs_writel(unsigned val, void __iomem *reg)
 193{
 194        writel(val, reg);
 195}
 196
 197static int pcs_get_groups_count(struct pinctrl_dev *pctldev)
 198{
 199        struct pcs_device *pcs;
 200
 201        pcs = pinctrl_dev_get_drvdata(pctldev);
 202
 203        return pcs->ngroups;
 204}
 205
 206static const char *pcs_get_group_name(struct pinctrl_dev *pctldev,
 207                                        unsigned gselector)
 208{
 209        struct pcs_device *pcs;
 210        struct pcs_pingroup *group;
 211
 212        pcs = pinctrl_dev_get_drvdata(pctldev);
 213        group = radix_tree_lookup(&pcs->pgtree, gselector);
 214        if (!group) {
 215                dev_err(pcs->dev, "%s could not find pingroup%i\n",
 216                        __func__, gselector);
 217                return NULL;
 218        }
 219
 220        return group->name;
 221}
 222
 223static int pcs_get_group_pins(struct pinctrl_dev *pctldev,
 224                                        unsigned gselector,
 225                                        const unsigned **pins,
 226                                        unsigned *npins)
 227{
 228        struct pcs_device *pcs;
 229        struct pcs_pingroup *group;
 230
 231        pcs = pinctrl_dev_get_drvdata(pctldev);
 232        group = radix_tree_lookup(&pcs->pgtree, gselector);
 233        if (!group) {
 234                dev_err(pcs->dev, "%s could not find pingroup%i\n",
 235                        __func__, gselector);
 236                return -EINVAL;
 237        }
 238
 239        *pins = group->gpins;
 240        *npins = group->ngpins;
 241
 242        return 0;
 243}
 244
 245static void pcs_pin_dbg_show(struct pinctrl_dev *pctldev,
 246                                        struct seq_file *s,
 247                                        unsigned pin)
 248{
 249        struct pcs_device *pcs;
 250        unsigned val, mux_bytes;
 251
 252        pcs = pinctrl_dev_get_drvdata(pctldev);
 253
 254        mux_bytes = pcs->width / BITS_PER_BYTE;
 255        val = pcs->read(pcs->base + pin * mux_bytes);
 256
 257        seq_printf(s, "%08x %s " , val, DRIVER_NAME);
 258}
 259
 260static void pcs_dt_free_map(struct pinctrl_dev *pctldev,
 261                                struct pinctrl_map *map, unsigned num_maps)
 262{
 263        struct pcs_device *pcs;
 264
 265        pcs = pinctrl_dev_get_drvdata(pctldev);
 266        devm_kfree(pcs->dev, map);
 267}
 268
 269static int pcs_dt_node_to_map(struct pinctrl_dev *pctldev,
 270                                struct device_node *np_config,
 271                                struct pinctrl_map **map, unsigned *num_maps);
 272
 273static struct pinctrl_ops pcs_pinctrl_ops = {
 274        .get_groups_count = pcs_get_groups_count,
 275        .get_group_name = pcs_get_group_name,
 276        .get_group_pins = pcs_get_group_pins,
 277        .pin_dbg_show = pcs_pin_dbg_show,
 278        .dt_node_to_map = pcs_dt_node_to_map,
 279        .dt_free_map = pcs_dt_free_map,
 280};
 281
 282static int pcs_get_functions_count(struct pinctrl_dev *pctldev)
 283{
 284        struct pcs_device *pcs;
 285
 286        pcs = pinctrl_dev_get_drvdata(pctldev);
 287
 288        return pcs->nfuncs;
 289}
 290
 291static const char *pcs_get_function_name(struct pinctrl_dev *pctldev,
 292                                                unsigned fselector)
 293{
 294        struct pcs_device *pcs;
 295        struct pcs_function *func;
 296
 297        pcs = pinctrl_dev_get_drvdata(pctldev);
 298        func = radix_tree_lookup(&pcs->ftree, fselector);
 299        if (!func) {
 300                dev_err(pcs->dev, "%s could not find function%i\n",
 301                        __func__, fselector);
 302                return NULL;
 303        }
 304
 305        return func->name;
 306}
 307
 308static int pcs_get_function_groups(struct pinctrl_dev *pctldev,
 309                                        unsigned fselector,
 310                                        const char * const **groups,
 311                                        unsigned * const ngroups)
 312{
 313        struct pcs_device *pcs;
 314        struct pcs_function *func;
 315
 316        pcs = pinctrl_dev_get_drvdata(pctldev);
 317        func = radix_tree_lookup(&pcs->ftree, fselector);
 318        if (!func) {
 319                dev_err(pcs->dev, "%s could not find function%i\n",
 320                        __func__, fselector);
 321                return -EINVAL;
 322        }
 323        *groups = func->pgnames;
 324        *ngroups = func->npgnames;
 325
 326        return 0;
 327}
 328
 329static int pcs_enable(struct pinctrl_dev *pctldev, unsigned fselector,
 330        unsigned group)
 331{
 332        struct pcs_device *pcs;
 333        struct pcs_function *func;
 334        int i;
 335
 336        pcs = pinctrl_dev_get_drvdata(pctldev);
 337        func = radix_tree_lookup(&pcs->ftree, fselector);
 338        if (!func)
 339                return -EINVAL;
 340
 341        dev_dbg(pcs->dev, "enabling %s function%i\n",
 342                func->name, fselector);
 343
 344        for (i = 0; i < func->nvals; i++) {
 345                struct pcs_func_vals *vals;
 346                unsigned val, mask;
 347
 348                vals = &func->vals[i];
 349                val = pcs->read(vals->reg);
 350                if (!vals->mask)
 351                        mask = pcs->fmask;
 352                else
 353                        mask = pcs->fmask & vals->mask;
 354
 355                val &= ~mask;
 356                val |= (vals->val & mask);
 357                pcs->write(val, vals->reg);
 358        }
 359
 360        return 0;
 361}
 362
 363static void pcs_disable(struct pinctrl_dev *pctldev, unsigned fselector,
 364                                        unsigned group)
 365{
 366        struct pcs_device *pcs;
 367        struct pcs_function *func;
 368        int i;
 369
 370        pcs = pinctrl_dev_get_drvdata(pctldev);
 371        func = radix_tree_lookup(&pcs->ftree, fselector);
 372        if (!func) {
 373                dev_err(pcs->dev, "%s could not find function%i\n",
 374                        __func__, fselector);
 375                return;
 376        }
 377
 378        /*
 379         * Ignore disable if function-off is not specified. Some hardware
 380         * does not have clearly defined disable function. For pin specific
 381         * off modes, you can use alternate named states as described in
 382         * pinctrl-bindings.txt.
 383         */
 384        if (pcs->foff == PCS_OFF_DISABLED) {
 385                dev_dbg(pcs->dev, "ignoring disable for %s function%i\n",
 386                        func->name, fselector);
 387                return;
 388        }
 389
 390        dev_dbg(pcs->dev, "disabling function%i %s\n",
 391                fselector, func->name);
 392
 393        for (i = 0; i < func->nvals; i++) {
 394                struct pcs_func_vals *vals;
 395                unsigned val;
 396
 397                vals = &func->vals[i];
 398                val = pcs->read(vals->reg);
 399                val &= ~pcs->fmask;
 400                val |= pcs->foff << pcs->fshift;
 401                pcs->write(val, vals->reg);
 402        }
 403}
 404
 405static int pcs_request_gpio(struct pinctrl_dev *pctldev,
 406                        struct pinctrl_gpio_range *range, unsigned offset)
 407{
 408        return -ENOTSUPP;
 409}
 410
 411static struct pinmux_ops pcs_pinmux_ops = {
 412        .get_functions_count = pcs_get_functions_count,
 413        .get_function_name = pcs_get_function_name,
 414        .get_function_groups = pcs_get_function_groups,
 415        .enable = pcs_enable,
 416        .disable = pcs_disable,
 417        .gpio_request_enable = pcs_request_gpio,
 418};
 419
 420static int pcs_pinconf_get(struct pinctrl_dev *pctldev,
 421                                unsigned pin, unsigned long *config)
 422{
 423        return -ENOTSUPP;
 424}
 425
 426static int pcs_pinconf_set(struct pinctrl_dev *pctldev,
 427                                unsigned pin, unsigned long config)
 428{
 429        return -ENOTSUPP;
 430}
 431
 432static int pcs_pinconf_group_get(struct pinctrl_dev *pctldev,
 433                                unsigned group, unsigned long *config)
 434{
 435        return -ENOTSUPP;
 436}
 437
 438static int pcs_pinconf_group_set(struct pinctrl_dev *pctldev,
 439                                unsigned group, unsigned long config)
 440{
 441        return -ENOTSUPP;
 442}
 443
 444static void pcs_pinconf_dbg_show(struct pinctrl_dev *pctldev,
 445                                struct seq_file *s, unsigned offset)
 446{
 447}
 448
 449static void pcs_pinconf_group_dbg_show(struct pinctrl_dev *pctldev,
 450                                struct seq_file *s, unsigned selector)
 451{
 452}
 453
 454static struct pinconf_ops pcs_pinconf_ops = {
 455        .pin_config_get = pcs_pinconf_get,
 456        .pin_config_set = pcs_pinconf_set,
 457        .pin_config_group_get = pcs_pinconf_group_get,
 458        .pin_config_group_set = pcs_pinconf_group_set,
 459        .pin_config_dbg_show = pcs_pinconf_dbg_show,
 460        .pin_config_group_dbg_show = pcs_pinconf_group_dbg_show,
 461};
 462
 463/**
 464 * pcs_add_pin() - add a pin to the static per controller pin array
 465 * @pcs: pcs driver instance
 466 * @offset: register offset from base
 467 */
 468static int pcs_add_pin(struct pcs_device *pcs, unsigned offset)
 469{
 470        struct pinctrl_pin_desc *pin;
 471        struct pcs_name *pn;
 472        int i;
 473
 474        i = pcs->pins.cur;
 475        if (i >= pcs->desc.npins) {
 476                dev_err(pcs->dev, "too many pins, max %i\n",
 477                        pcs->desc.npins);
 478                return -ENOMEM;
 479        }
 480
 481        pin = &pcs->pins.pa[i];
 482        pn = &pcs->names[i];
 483        sprintf(pn->name, "%lx",
 484                (unsigned long)pcs->res->start + offset);
 485        pin->name = pn->name;
 486        pin->number = i;
 487        pcs->pins.cur++;
 488
 489        return i;
 490}
 491
 492/**
 493 * pcs_allocate_pin_table() - adds all the pins for the pinctrl driver
 494 * @pcs: pcs driver instance
 495 *
 496 * In case of errors, resources are freed in pcs_free_resources.
 497 *
 498 * If your hardware needs holes in the address space, then just set
 499 * up multiple driver instances.
 500 */
 501static int pcs_allocate_pin_table(struct pcs_device *pcs)
 502{
 503        int mux_bytes, nr_pins, i;
 504
 505        mux_bytes = pcs->width / BITS_PER_BYTE;
 506        nr_pins = pcs->size / mux_bytes;
 507
 508        dev_dbg(pcs->dev, "allocating %i pins\n", nr_pins);
 509        pcs->pins.pa = devm_kzalloc(pcs->dev,
 510                                sizeof(*pcs->pins.pa) * nr_pins,
 511                                GFP_KERNEL);
 512        if (!pcs->pins.pa)
 513                return -ENOMEM;
 514
 515        pcs->names = devm_kzalloc(pcs->dev,
 516                                sizeof(struct pcs_name) * nr_pins,
 517                                GFP_KERNEL);
 518        if (!pcs->names)
 519                return -ENOMEM;
 520
 521        pcs->desc.pins = pcs->pins.pa;
 522        pcs->desc.npins = nr_pins;
 523
 524        for (i = 0; i < pcs->desc.npins; i++) {
 525                unsigned offset;
 526                int res;
 527
 528                offset = i * mux_bytes;
 529                res = pcs_add_pin(pcs, offset);
 530                if (res < 0) {
 531                        dev_err(pcs->dev, "error adding pins: %i\n", res);
 532                        return res;
 533                }
 534        }
 535
 536        return 0;
 537}
 538
 539/**
 540 * pcs_add_function() - adds a new function to the function list
 541 * @pcs: pcs driver instance
 542 * @np: device node of the mux entry
 543 * @name: name of the function
 544 * @vals: array of mux register value pairs used by the function
 545 * @nvals: number of mux register value pairs
 546 * @pgnames: array of pingroup names for the function
 547 * @npgnames: number of pingroup names
 548 */
 549static struct pcs_function *pcs_add_function(struct pcs_device *pcs,
 550                                        struct device_node *np,
 551                                        const char *name,
 552                                        struct pcs_func_vals *vals,
 553                                        unsigned nvals,
 554                                        const char **pgnames,
 555                                        unsigned npgnames)
 556{
 557        struct pcs_function *function;
 558
 559        function = devm_kzalloc(pcs->dev, sizeof(*function), GFP_KERNEL);
 560        if (!function)
 561                return NULL;
 562
 563        function->name = name;
 564        function->vals = vals;
 565        function->nvals = nvals;
 566        function->pgnames = pgnames;
 567        function->npgnames = npgnames;
 568
 569        mutex_lock(&pcs->mutex);
 570        list_add_tail(&function->node, &pcs->functions);
 571        radix_tree_insert(&pcs->ftree, pcs->nfuncs, function);
 572        pcs->nfuncs++;
 573        mutex_unlock(&pcs->mutex);
 574
 575        return function;
 576}
 577
 578static void pcs_remove_function(struct pcs_device *pcs,
 579                                struct pcs_function *function)
 580{
 581        int i;
 582
 583        mutex_lock(&pcs->mutex);
 584        for (i = 0; i < pcs->nfuncs; i++) {
 585                struct pcs_function *found;
 586
 587                found = radix_tree_lookup(&pcs->ftree, i);
 588                if (found == function)
 589                        radix_tree_delete(&pcs->ftree, i);
 590        }
 591        list_del(&function->node);
 592        mutex_unlock(&pcs->mutex);
 593}
 594
 595/**
 596 * pcs_add_pingroup() - add a pingroup to the pingroup list
 597 * @pcs: pcs driver instance
 598 * @np: device node of the mux entry
 599 * @name: name of the pingroup
 600 * @gpins: array of the pins that belong to the group
 601 * @ngpins: number of pins in the group
 602 */
 603static int pcs_add_pingroup(struct pcs_device *pcs,
 604                                        struct device_node *np,
 605                                        const char *name,
 606                                        int *gpins,
 607                                        int ngpins)
 608{
 609        struct pcs_pingroup *pingroup;
 610
 611        pingroup = devm_kzalloc(pcs->dev, sizeof(*pingroup), GFP_KERNEL);
 612        if (!pingroup)
 613                return -ENOMEM;
 614
 615        pingroup->name = name;
 616        pingroup->np = np;
 617        pingroup->gpins = gpins;
 618        pingroup->ngpins = ngpins;
 619
 620        mutex_lock(&pcs->mutex);
 621        list_add_tail(&pingroup->node, &pcs->pingroups);
 622        radix_tree_insert(&pcs->pgtree, pcs->ngroups, pingroup);
 623        pcs->ngroups++;
 624        mutex_unlock(&pcs->mutex);
 625
 626        return 0;
 627}
 628
 629/**
 630 * pcs_get_pin_by_offset() - get a pin index based on the register offset
 631 * @pcs: pcs driver instance
 632 * @offset: register offset from the base
 633 *
 634 * Note that this is OK as long as the pins are in a static array.
 635 */
 636static int pcs_get_pin_by_offset(struct pcs_device *pcs, unsigned offset)
 637{
 638        unsigned index;
 639
 640        if (offset >= pcs->size) {
 641                dev_err(pcs->dev, "mux offset out of range: 0x%x (0x%x)\n",
 642                        offset, pcs->size);
 643                return -EINVAL;
 644        }
 645
 646        index = offset / (pcs->width / BITS_PER_BYTE);
 647
 648        return index;
 649}
 650
 651/**
 652 * smux_parse_one_pinctrl_entry() - parses a device tree mux entry
 653 * @pcs: pinctrl driver instance
 654 * @np: device node of the mux entry
 655 * @map: map entry
 656 * @pgnames: pingroup names
 657 *
 658 * Note that this binding currently supports only sets of one register + value.
 659 *
 660 * Also note that this driver tries to avoid understanding pin and function
 661 * names because of the extra bloat they would cause especially in the case of
 662 * a large number of pins. This driver just sets what is specified for the board
 663 * in the .dts file. Further user space debugging tools can be developed to
 664 * decipher the pin and function names using debugfs.
 665 *
 666 * If you are concerned about the boot time, set up the static pins in
 667 * the bootloader, and only set up selected pins as device tree entries.
 668 */
 669static int pcs_parse_one_pinctrl_entry(struct pcs_device *pcs,
 670                                                struct device_node *np,
 671                                                struct pinctrl_map **map,
 672                                                const char **pgnames)
 673{
 674        struct pcs_func_vals *vals;
 675        const __be32 *mux;
 676        int size, params, rows, *pins, index = 0, found = 0, res = -ENOMEM;
 677        struct pcs_function *function;
 678
 679        if (pcs->bits_per_mux) {
 680                params = 3;
 681                mux = of_get_property(np, PCS_MUX_BITS_NAME, &size);
 682        } else {
 683                params = 2;
 684                mux = of_get_property(np, PCS_MUX_PINS_NAME, &size);
 685        }
 686
 687        if (!mux) {
 688                dev_err(pcs->dev, "no valid property for %s\n", np->name);
 689                return -EINVAL;
 690        }
 691
 692        if (size < (sizeof(*mux) * params)) {
 693                dev_err(pcs->dev, "bad data for %s\n", np->name);
 694                return -EINVAL;
 695        }
 696
 697        size /= sizeof(*mux);   /* Number of elements in array */
 698        rows = size / params;
 699
 700        vals = devm_kzalloc(pcs->dev, sizeof(*vals) * rows, GFP_KERNEL);
 701        if (!vals)
 702                return -ENOMEM;
 703
 704        pins = devm_kzalloc(pcs->dev, sizeof(*pins) * rows, GFP_KERNEL);
 705        if (!pins)
 706                goto free_vals;
 707
 708        while (index < size) {
 709                unsigned offset, val;
 710                int pin;
 711
 712                offset = be32_to_cpup(mux + index++);
 713                val = be32_to_cpup(mux + index++);
 714                vals[found].reg = pcs->base + offset;
 715                vals[found].val = val;
 716                if (params == 3) {
 717                        val = be32_to_cpup(mux + index++);
 718                        vals[found].mask = val;
 719                }
 720
 721                pin = pcs_get_pin_by_offset(pcs, offset);
 722                if (pin < 0) {
 723                        dev_err(pcs->dev,
 724                                "could not add functions for %s %ux\n",
 725                                np->name, offset);
 726                        break;
 727                }
 728                pins[found++] = pin;
 729        }
 730
 731        pgnames[0] = np->name;
 732        function = pcs_add_function(pcs, np, np->name, vals, found, pgnames, 1);
 733        if (!function)
 734                goto free_pins;
 735
 736        res = pcs_add_pingroup(pcs, np, np->name, pins, found);
 737        if (res < 0)
 738                goto free_function;
 739
 740        (*map)->type = PIN_MAP_TYPE_MUX_GROUP;
 741        (*map)->data.mux.group = np->name;
 742        (*map)->data.mux.function = np->name;
 743
 744        return 0;
 745
 746free_function:
 747        pcs_remove_function(pcs, function);
 748
 749free_pins:
 750        devm_kfree(pcs->dev, pins);
 751
 752free_vals:
 753        devm_kfree(pcs->dev, vals);
 754
 755        return res;
 756}
 757/**
 758 * pcs_dt_node_to_map() - allocates and parses pinctrl maps
 759 * @pctldev: pinctrl instance
 760 * @np_config: device tree pinmux entry
 761 * @map: array of map entries
 762 * @num_maps: number of maps
 763 */
 764static int pcs_dt_node_to_map(struct pinctrl_dev *pctldev,
 765                                struct device_node *np_config,
 766                                struct pinctrl_map **map, unsigned *num_maps)
 767{
 768        struct pcs_device *pcs;
 769        const char **pgnames;
 770        int ret;
 771
 772        pcs = pinctrl_dev_get_drvdata(pctldev);
 773
 774        *map = devm_kzalloc(pcs->dev, sizeof(**map), GFP_KERNEL);
 775        if (!*map)
 776                return -ENOMEM;
 777
 778        *num_maps = 0;
 779
 780        pgnames = devm_kzalloc(pcs->dev, sizeof(*pgnames), GFP_KERNEL);
 781        if (!pgnames) {
 782                ret = -ENOMEM;
 783                goto free_map;
 784        }
 785
 786        ret = pcs_parse_one_pinctrl_entry(pcs, np_config, map, pgnames);
 787        if (ret < 0) {
 788                dev_err(pcs->dev, "no pins entries for %s\n",
 789                        np_config->name);
 790                goto free_pgnames;
 791        }
 792        *num_maps = 1;
 793
 794        return 0;
 795
 796free_pgnames:
 797        devm_kfree(pcs->dev, pgnames);
 798free_map:
 799        devm_kfree(pcs->dev, *map);
 800
 801        return ret;
 802}
 803
 804/**
 805 * pcs_free_funcs() - free memory used by functions
 806 * @pcs: pcs driver instance
 807 */
 808static void pcs_free_funcs(struct pcs_device *pcs)
 809{
 810        struct list_head *pos, *tmp;
 811        int i;
 812
 813        mutex_lock(&pcs->mutex);
 814        for (i = 0; i < pcs->nfuncs; i++) {
 815                struct pcs_function *func;
 816
 817                func = radix_tree_lookup(&pcs->ftree, i);
 818                if (!func)
 819                        continue;
 820                radix_tree_delete(&pcs->ftree, i);
 821        }
 822        list_for_each_safe(pos, tmp, &pcs->functions) {
 823                struct pcs_function *function;
 824
 825                function = list_entry(pos, struct pcs_function, node);
 826                list_del(&function->node);
 827        }
 828        mutex_unlock(&pcs->mutex);
 829}
 830
 831/**
 832 * pcs_free_pingroups() - free memory used by pingroups
 833 * @pcs: pcs driver instance
 834 */
 835static void pcs_free_pingroups(struct pcs_device *pcs)
 836{
 837        struct list_head *pos, *tmp;
 838        int i;
 839
 840        mutex_lock(&pcs->mutex);
 841        for (i = 0; i < pcs->ngroups; i++) {
 842                struct pcs_pingroup *pingroup;
 843
 844                pingroup = radix_tree_lookup(&pcs->pgtree, i);
 845                if (!pingroup)
 846                        continue;
 847                radix_tree_delete(&pcs->pgtree, i);
 848        }
 849        list_for_each_safe(pos, tmp, &pcs->pingroups) {
 850                struct pcs_pingroup *pingroup;
 851
 852                pingroup = list_entry(pos, struct pcs_pingroup, node);
 853                list_del(&pingroup->node);
 854        }
 855        mutex_unlock(&pcs->mutex);
 856}
 857
 858/**
 859 * pcs_free_resources() - free memory used by this driver
 860 * @pcs: pcs driver instance
 861 */
 862static void pcs_free_resources(struct pcs_device *pcs)
 863{
 864        if (pcs->pctl)
 865                pinctrl_unregister(pcs->pctl);
 866
 867        pcs_free_funcs(pcs);
 868        pcs_free_pingroups(pcs);
 869}
 870
 871#define PCS_GET_PROP_U32(name, reg, err)                                \
 872        do {                                                            \
 873                ret = of_property_read_u32(np, name, reg);              \
 874                if (ret) {                                              \
 875                        dev_err(pcs->dev, err);                         \
 876                        return ret;                                     \
 877                }                                                       \
 878        } while (0);
 879
 880static struct of_device_id pcs_of_match[];
 881
 882static int pcs_probe(struct platform_device *pdev)
 883{
 884        struct device_node *np = pdev->dev.of_node;
 885        const struct of_device_id *match;
 886        struct resource *res;
 887        struct pcs_device *pcs;
 888        int ret;
 889
 890        match = of_match_device(pcs_of_match, &pdev->dev);
 891        if (!match)
 892                return -EINVAL;
 893
 894        pcs = devm_kzalloc(&pdev->dev, sizeof(*pcs), GFP_KERNEL);
 895        if (!pcs) {
 896                dev_err(&pdev->dev, "could not allocate\n");
 897                return -ENOMEM;
 898        }
 899        pcs->dev = &pdev->dev;
 900        mutex_init(&pcs->mutex);
 901        INIT_LIST_HEAD(&pcs->pingroups);
 902        INIT_LIST_HEAD(&pcs->functions);
 903
 904        PCS_GET_PROP_U32("pinctrl-single,register-width", &pcs->width,
 905                         "register width not specified\n");
 906
 907        PCS_GET_PROP_U32("pinctrl-single,function-mask", &pcs->fmask,
 908                         "function register mask not specified\n");
 909        pcs->fshift = ffs(pcs->fmask) - 1;
 910        pcs->fmax = pcs->fmask >> pcs->fshift;
 911
 912        ret = of_property_read_u32(np, "pinctrl-single,function-off",
 913                                        &pcs->foff);
 914        if (ret)
 915                pcs->foff = PCS_OFF_DISABLED;
 916
 917        pcs->bits_per_mux = of_property_read_bool(np,
 918                                                  "pinctrl-single,bit-per-mux");
 919
 920        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 921        if (!res) {
 922                dev_err(pcs->dev, "could not get resource\n");
 923                return -ENODEV;
 924        }
 925
 926        pcs->res = devm_request_mem_region(pcs->dev, res->start,
 927                        resource_size(res), DRIVER_NAME);
 928        if (!pcs->res) {
 929                dev_err(pcs->dev, "could not get mem_region\n");
 930                return -EBUSY;
 931        }
 932
 933        pcs->size = resource_size(pcs->res);
 934        pcs->base = devm_ioremap(pcs->dev, pcs->res->start, pcs->size);
 935        if (!pcs->base) {
 936                dev_err(pcs->dev, "could not ioremap\n");
 937                return -ENODEV;
 938        }
 939
 940        INIT_RADIX_TREE(&pcs->pgtree, GFP_KERNEL);
 941        INIT_RADIX_TREE(&pcs->ftree, GFP_KERNEL);
 942        platform_set_drvdata(pdev, pcs);
 943
 944        switch (pcs->width) {
 945        case 8:
 946                pcs->read = pcs_readb;
 947                pcs->write = pcs_writeb;
 948                break;
 949        case 16:
 950                pcs->read = pcs_readw;
 951                pcs->write = pcs_writew;
 952                break;
 953        case 32:
 954                pcs->read = pcs_readl;
 955                pcs->write = pcs_writel;
 956                break;
 957        default:
 958                break;
 959        }
 960
 961        pcs->desc.name = DRIVER_NAME;
 962        pcs->desc.pctlops = &pcs_pinctrl_ops;
 963        pcs->desc.pmxops = &pcs_pinmux_ops;
 964        pcs->desc.confops = &pcs_pinconf_ops;
 965        pcs->desc.owner = THIS_MODULE;
 966
 967        ret = pcs_allocate_pin_table(pcs);
 968        if (ret < 0)
 969                goto free;
 970
 971        pcs->pctl = pinctrl_register(&pcs->desc, pcs->dev, pcs);
 972        if (!pcs->pctl) {
 973                dev_err(pcs->dev, "could not register single pinctrl driver\n");
 974                ret = -EINVAL;
 975                goto free;
 976        }
 977
 978        dev_info(pcs->dev, "%i pins at pa %p size %u\n",
 979                 pcs->desc.npins, pcs->base, pcs->size);
 980
 981        return 0;
 982
 983free:
 984        pcs_free_resources(pcs);
 985
 986        return ret;
 987}
 988
 989static int pcs_remove(struct platform_device *pdev)
 990{
 991        struct pcs_device *pcs = platform_get_drvdata(pdev);
 992
 993        if (!pcs)
 994                return 0;
 995
 996        pcs_free_resources(pcs);
 997
 998        return 0;
 999}
1000
1001static struct of_device_id pcs_of_match[] = {
1002        { .compatible = DRIVER_NAME, },
1003        { },
1004};
1005MODULE_DEVICE_TABLE(of, pcs_of_match);
1006
1007static struct platform_driver pcs_driver = {
1008        .probe          = pcs_probe,
1009        .remove         = pcs_remove,
1010        .driver = {
1011                .owner          = THIS_MODULE,
1012                .name           = DRIVER_NAME,
1013                .of_match_table = pcs_of_match,
1014        },
1015};
1016
1017module_platform_driver(pcs_driver);
1018
1019MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
1020MODULE_DESCRIPTION("One-register-per-pin type device tree based pinctrl driver");
1021MODULE_LICENSE("GPL v2");
1022
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