drivers/pinctrl/pinctrl-imx.c

   1 /*
   2  * Core driver for the imx pin controller
   3  *
   4  * Copyright (C) 2012 Freescale Semiconductor, Inc.
   5  * Copyright (C) 2012 Linaro Ltd.
   6  *
   7  * Author: Dong Aisheng <dong.aisheng@linaro.org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  */
  14
  15 #include <linux/err.h>
  16 #include <linux/init.h>
  17 #include <linux/io.h>
  18 #include <linux/module.h>
  19 #include <linux/of.h>
  20 #include <linux/of_device.h>
  21 #include <linux/pinctrl/machine.h>
  22 #include <linux/pinctrl/pinconf.h>
  23 #include <linux/pinctrl/pinctrl.h>
  24 #include <linux/pinctrl/pinmux.h>
  25 #include <linux/slab.h>
  26
  27 #include "core.h"
  28 #include "pinctrl-imx.h"
  29
  30 #define IMX_PMX_DUMP(info, p, m, c, n)                  \
  31 {                                                       \
  32         int i, j;                                       \
  33         printk(KERN_DEBUG "Format: Pin Mux Config\n");  \
  34         for (i = 0; i < n; i++) {                       \
  35                 j = p[i];                               \
  36                 printk(KERN_DEBUG "%s %d 0x%lx\n",      \
  37                         info->pins[j].name,             \
  38                         m[i], c[i]);                    \
  39         }                                               \
  40 }
  41
  42 /* The bits in CONFIG cell defined in binding doc*/
  43 #define IMX_NO_PAD_CTL  0x80000000      /* no pin config need */
  44 #define IMX_PAD_SION 0x40000000         /* set SION */
  45
  46 /**
  47  * @dev: a pointer back to containing device
  48  * @base: the offset to the controller in virtual memory
  49  */
  50 struct imx_pinctrl {
  51         struct device *dev;
  52         struct pinctrl_dev *pctl;
  53         void __iomem *base;
  54         const struct imx_pinctrl_soc_info *info;
  55 };
  56
  57 static const inline struct imx_pin_group *imx_pinctrl_find_group_by_name(
  58                                 const struct imx_pinctrl_soc_info *info,
  59                                 const char *name)
  60 {
  61         const struct imx_pin_group *grp = NULL;
  62         int i;
  63
  64         for (i = 0; i < info->ngroups; i++) {
  65                 if (!strcmp(info->groups[i].name, name)) {
  66                         grp = &info->groups[i];
  67                         break;
  68                 }
  69         }
  70
  71         return grp;
  72 }
  73
  74 static int imx_get_groups_count(struct pinctrl_dev *pctldev)
  75 {
  76         struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
  77         const struct imx_pinctrl_soc_info *info = ipctl->info;
  78
  79         return info->ngroups;
  80 }
  81
  82 static const char *imx_get_group_name(struct pinctrl_dev *pctldev,
  83                                        unsigned selector)
  84 {
  85         struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
  86         const struct imx_pinctrl_soc_info *info = ipctl->info;
  87
  88         return info->groups[selector].name;
  89 }
  90
  91 static int imx_get_group_pins(struct pinctrl_dev *pctldev, unsigned selector,
  92                                const unsigned **pins,
  93                                unsigned *npins)
  94 {
  95         struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
  96         const struct imx_pinctrl_soc_info *info = ipctl->info;
  97
  98         if (selector >= info->ngroups)
  99                 return -EINVAL;
 100
 101         *pins = info->groups[selector].pins;
 102         *npins = info->groups[selector].npins;
 103
 104         return 0;
 105 }
 106
 107 static void imx_pin_dbg_show(struct pinctrl_dev *pctldev, struct seq_file *s,
 108                    unsigned offset)
 109 {
 110         seq_printf(s, "%s", dev_name(pctldev->dev));
 111 }
 112
 113 static int imx_dt_node_to_map(struct pinctrl_dev *pctldev,
 114                         struct device_node *np,
 115                         struct pinctrl_map **map, unsigned *num_maps)
 116 {
 117         struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
 118         const struct imx_pinctrl_soc_info *info = ipctl->info;
 119         const struct imx_pin_group *grp;
 120         struct pinctrl_map *new_map;
 121         struct device_node *parent;
 122         int map_num = 1;
 123         int i, j;
 124
 125         /*
 126          * first find the group of this node and check if we need create
 127          * config maps for pins
 128          */
 129         grp = imx_pinctrl_find_group_by_name(info, np->name);
 130         if (!grp) {
 131                 dev_err(info->dev, "unable to find group for node %s\n",
 132                         np->name);
 133                 return -EINVAL;
 134         }
 135
 136         for (i = 0; i < grp->npins; i++) {
 137                 if (!(grp->configs[i] & IMX_NO_PAD_CTL))
 138                         map_num++;
 139         }
 140
 141         new_map = kmalloc(sizeof(struct pinctrl_map) * map_num, GFP_KERNEL);
 142         if (!new_map)
 143                 return -ENOMEM;
 144
 145         *map = new_map;
 146         *num_maps = map_num;
 147
 148         /* create mux map */
 149         parent = of_get_parent(np);
 150         if (!parent) {
 151                 kfree(new_map);
 152                 return -EINVAL;
 153         }
 154         new_map[0].type = PIN_MAP_TYPE_MUX_GROUP;
 155         new_map[0].data.mux.function = parent->name;
 156         new_map[0].data.mux.group = np->name;
 157         of_node_put(parent);
 158
 159         /* create config map */
 160         new_map++;
 161         for (i = j = 0; i < grp->npins; i++) {
 162                 if (!(grp->configs[i] & IMX_NO_PAD_CTL)) {
 163                         new_map[j].type = PIN_MAP_TYPE_CONFIGS_PIN;
 164                         new_map[j].data.configs.group_or_pin =
 165                                         pin_get_name(pctldev, grp->pins[i]);
 166                         new_map[j].data.configs.configs = &grp->configs[i];
 167                         new_map[j].data.configs.num_configs = 1;
 168                         j++;
 169                 }
 170         }
 171
 172         dev_dbg(pctldev->dev, "maps: function %s group %s num %d\n",
 173                 (*map)->data.mux.function, (*map)->data.mux.group, map_num);
 174
 175         return 0;
 176 }
 177
 178 static void imx_dt_free_map(struct pinctrl_dev *pctldev,
 179                                 struct pinctrl_map *map, unsigned num_maps)
 180 {
 181         kfree(map);
 182 }
 183
 184 static const struct pinctrl_ops imx_pctrl_ops = {
 185         .get_groups_count = imx_get_groups_count,
 186         .get_group_name = imx_get_group_name,
 187         .get_group_pins = imx_get_group_pins,
 188         .pin_dbg_show = imx_pin_dbg_show,
 189         .dt_node_to_map = imx_dt_node_to_map,
 190         .dt_free_map = imx_dt_free_map,
 191
 192 };
 193
 194 static int imx_pmx_enable(struct pinctrl_dev *pctldev, unsigned selector,
 195                            unsigned group)
 196 {
 197         struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
 198         const struct imx_pinctrl_soc_info *info = ipctl->info;
 199         const struct imx_pin_reg *pin_reg;
 200         const unsigned *pins, *mux, *input_val;
 201         u16 *input_reg;
 202         unsigned int npins, pin_id;
 203         int i;
 204
 205         /*
 206          * Configure the mux mode for each pin in the group for a specific
 207          * function.
 208          */
 209         pins = info->groups[group].pins;
 210         npins = info->groups[group].npins;
 211         mux = info->groups[group].mux_mode;
 212         input_val = info->groups[group].input_val;
 213         input_reg = info->groups[group].input_reg;
 214
 215         WARN_ON(!pins || !npins || !mux || !input_val || !input_reg);
 216
 217         dev_dbg(ipctl->dev, "enable function %s group %s\n",
 218                 info->functions[selector].name, info->groups[group].name);
 219
 220         for (i = 0; i < npins; i++) {
 221                 pin_id = pins[i];
 222                 pin_reg = &info->pin_regs[pin_id];
 223
 224                 if (!pin_reg->mux_reg) {
 225                         dev_err(ipctl->dev, "Pin(%s) does not support mux function\n",
 226                                 info->pins[pin_id].name);
 227                         return -EINVAL;
 228                 }
 229
 230                 writel(mux[i], ipctl->base + pin_reg->mux_reg);
 231                 dev_dbg(ipctl->dev, "write: offset 0x%x val 0x%x\n",
 232                         pin_reg->mux_reg, mux[i]);
 233
 234                 /* some pins also need select input setting, set it if found */
 235                 if (input_reg[i]) {
 236                         writel(input_val[i], ipctl->base + input_reg[i]);
 237                         dev_dbg(ipctl->dev,
 238                                 "==>select_input: offset 0x%x val 0x%x\n",
 239                                 input_reg[i], input_val[i]);
 240                 }
 241         }
 242
 243         return 0;
 244 }
 245
 246 static int imx_pmx_get_funcs_count(struct pinctrl_dev *pctldev)
 247 {
 248         struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
 249         const struct imx_pinctrl_soc_info *info = ipctl->info;
 250
 251         return info->nfunctions;
 252 }
 253
 254 static const char *imx_pmx_get_func_name(struct pinctrl_dev *pctldev,
 255                                           unsigned selector)
 256 {
 257         struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
 258         const struct imx_pinctrl_soc_info *info = ipctl->info;
 259
 260         return info->functions[selector].name;
 261 }
 262
 263 static int imx_pmx_get_groups(struct pinctrl_dev *pctldev, unsigned selector,
 264                                const char * const **groups,
 265                                unsigned * const num_groups)
 266 {
 267         struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
 268         const struct imx_pinctrl_soc_info *info = ipctl->info;
 269
 270         *groups = info->functions[selector].groups;
 271         *num_groups = info->functions[selector].num_groups;
 272
 273         return 0;
 274 }
 275
 276 static const struct pinmux_ops imx_pmx_ops = {
 277         .get_functions_count = imx_pmx_get_funcs_count,
 278         .get_function_name = imx_pmx_get_func_name,
 279         .get_function_groups = imx_pmx_get_groups,
 280         .enable = imx_pmx_enable,
 281 };
 282
 283 static int imx_pinconf_get(struct pinctrl_dev *pctldev,
 284                              unsigned pin_id, unsigned long *config)
 285 {
 286         struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
 287         const struct imx_pinctrl_soc_info *info = ipctl->info;
 288         const struct imx_pin_reg *pin_reg = &info->pin_regs[pin_id];
 289
 290         if (!pin_reg->conf_reg) {
 291                 dev_err(info->dev, "Pin(%s) does not support config function\n",
 292                         info->pins[pin_id].name);
 293                 return -EINVAL;
 294         }
 295
 296         *config = readl(ipctl->base + pin_reg->conf_reg);
 297
 298         return 0;
 299 }
 300
 301 static int imx_pinconf_set(struct pinctrl_dev *pctldev,
 302                              unsigned pin_id, unsigned long config)
 303 {
 304         struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
 305         const struct imx_pinctrl_soc_info *info = ipctl->info;
 306         const struct imx_pin_reg *pin_reg = &info->pin_regs[pin_id];
 307
 308         if (!pin_reg->conf_reg) {
 309                 dev_err(info->dev, "Pin(%s) does not support config function\n",
 310                         info->pins[pin_id].name);
 311                 return -EINVAL;
 312         }
 313
 314         dev_dbg(ipctl->dev, "pinconf set pin %s\n",
 315                 info->pins[pin_id].name);
 316
 317         writel(config, ipctl->base + pin_reg->conf_reg);
 318         dev_dbg(ipctl->dev, "write: offset 0x%x val 0x%lx\n",
 319                 pin_reg->conf_reg, config);
 320
 321         return 0;
 322 }
 323
 324 static void imx_pinconf_dbg_show(struct pinctrl_dev *pctldev,
 325                                    struct seq_file *s, unsigned pin_id)
 326 {
 327         struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
 328         const struct imx_pinctrl_soc_info *info = ipctl->info;
 329         const struct imx_pin_reg *pin_reg = &info->pin_regs[pin_id];
 330         unsigned long config;
 331
 332         if (!pin_reg || !pin_reg->conf_reg) {
 333                 seq_printf(s, "N/A");
 334                 return;
 335         }
 336
 337         config = readl(ipctl->base + pin_reg->conf_reg);
 338         seq_printf(s, "0x%lx", config);
 339 }
 340
 341 static void imx_pinconf_group_dbg_show(struct pinctrl_dev *pctldev,
 342                                          struct seq_file *s, unsigned group)
 343 {
 344         struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
 345         const struct imx_pinctrl_soc_info *info = ipctl->info;
 346         struct imx_pin_group *grp;
 347         unsigned long config;
 348         const char *name;
 349         int i, ret;
 350
 351         if (group > info->ngroups)
 352                 return;
 353
 354         seq_printf(s, "\n");
 355         grp = &info->groups[group];
 356         for (i = 0; i < grp->npins; i++) {
 357                 name = pin_get_name(pctldev, grp->pins[i]);
 358                 ret = imx_pinconf_get(pctldev, grp->pins[i], &config);
 359                 if (ret)
 360                         return;
 361                 seq_printf(s, "%s: 0x%lx", name, config);
 362         }
 363 }
 364
 365 static const struct pinconf_ops imx_pinconf_ops = {
 366         .pin_config_get = imx_pinconf_get,
 367         .pin_config_set = imx_pinconf_set,
 368         .pin_config_dbg_show = imx_pinconf_dbg_show,
 369         .pin_config_group_dbg_show = imx_pinconf_group_dbg_show,
 370 };
 371
 372 static struct pinctrl_desc imx_pinctrl_desc = {
 373         .pctlops = &imx_pctrl_ops,
 374         .pmxops = &imx_pmx_ops,
 375         .confops = &imx_pinconf_ops,
 376         .owner = THIS_MODULE,
 377 };
 378
 379 /*
 380  * Each pin represented in fsl,pins consists of 5 u32 PIN_FUNC_ID and
 381  * 1 u32 CONFIG, so 24 types in total for each pin.
 382  */
 383 #define FSL_PIN_SIZE 24
 384
 385 static int imx_pinctrl_parse_groups(struct device_node *np,
 386                                     struct imx_pin_group *grp,
 387                                     struct imx_pinctrl_soc_info *info,
 388                                     u32 index)
 389 {
 390         int size;
 391         const __be32 *list;
 392         int i;
 393         u32 config;
 394
 395         dev_dbg(info->dev, "group(%d): %s\n", index, np->name);
 396
 397         /* Initialise group */
 398         grp->name = np->name;
 399
 400         /*
 401          * the binding format is fsl,pins = <PIN_FUNC_ID CONFIG ...>,
 402          * do sanity check and calculate pins number
 403          */
 404         list = of_get_property(np, "fsl,pins", &size);
 405         /* we do not check return since it's safe node passed down */
 406         if (!size || size % FSL_PIN_SIZE) {
 407                 dev_err(info->dev, "Invalid fsl,pins property\n");
 408                 return -EINVAL;
 409         }
 410
 411         grp->npins = size / FSL_PIN_SIZE;
 412         grp->pins = devm_kzalloc(info->dev, grp->npins * sizeof(unsigned int),
 413                                 GFP_KERNEL);
 414         grp->mux_mode = devm_kzalloc(info->dev, grp->npins * sizeof(unsigned int),
 415                                 GFP_KERNEL);
 416         grp->input_reg = devm_kzalloc(info->dev, grp->npins * sizeof(u16),
 417                                 GFP_KERNEL);
 418         grp->input_val = devm_kzalloc(info->dev, grp->npins * sizeof(unsigned int),
 419                                 GFP_KERNEL);
 420         grp->configs = devm_kzalloc(info->dev, grp->npins * sizeof(unsigned long),
 421                                 GFP_KERNEL);
 422         for (i = 0; i < grp->npins; i++) {
 423                 u32 mux_reg = be32_to_cpu(*list++);
 424                 u32 conf_reg = be32_to_cpu(*list++);
 425                 unsigned int pin_id = mux_reg ? mux_reg / 4 : conf_reg / 4;
 426                 struct imx_pin_reg *pin_reg = &info->pin_regs[pin_id];
 427
 428                 grp->pins[i] = pin_id;
 429                 pin_reg->mux_reg = mux_reg;
 430                 pin_reg->conf_reg = conf_reg;
 431                 grp->input_reg[i] = be32_to_cpu(*list++);
 432                 grp->mux_mode[i] = be32_to_cpu(*list++);
 433                 grp->input_val[i] = be32_to_cpu(*list++);
 434
 435                 /* SION bit is in mux register */
 436                 config = be32_to_cpu(*list++);
 437                 if (config & IMX_PAD_SION)
 438                         grp->mux_mode[i] |= IOMUXC_CONFIG_SION;
 439                 grp->configs[i] = config & ~IMX_PAD_SION;
 440         }
 441
 442 #ifdef DEBUG
 443         IMX_PMX_DUMP(info, grp->pins, grp->mux_mode, grp->configs, grp->npins);
 444 #endif
 445
 446         return 0;
 447 }
 448
 449 static int imx_pinctrl_parse_functions(struct device_node *np,
 450                                        struct imx_pinctrl_soc_info *info,
 451                                        u32 index)
 452 {
 453         struct device_node *child;
 454         struct imx_pmx_func *func;
 455         struct imx_pin_group *grp;
 456         int ret;
 457         static u32 grp_index;
 458         u32 i = 0;
 459
 460         dev_dbg(info->dev, "parse function(%d): %s\n", index, np->name);
 461
 462         func = &info->functions[index];
 463
 464         /* Initialise function */
 465         func->name = np->name;
 466         func->num_groups = of_get_child_count(np);
 467         if (func->num_groups <= 0) {
 468                 dev_err(info->dev, "no groups defined\n");
 469                 return -EINVAL;
 470         }
 471         func->groups = devm_kzalloc(info->dev,
 472                         func->num_groups * sizeof(char *), GFP_KERNEL);
 473
 474         for_each_child_of_node(np, child) {
 475                 func->groups[i] = child->name;
 476                 grp = &info->groups[grp_index++];
 477                 ret = imx_pinctrl_parse_groups(child, grp, info, i++);
 478                 if (ret)
 479                         return ret;
 480         }
 481
 482         return 0;
 483 }
 484
 485 static int imx_pinctrl_probe_dt(struct platform_device *pdev,
 486                                 struct imx_pinctrl_soc_info *info)
 487 {
 488         struct device_node *np = pdev->dev.of_node;
 489         struct device_node *child;
 490         int ret;
 491         u32 nfuncs = 0;
 492         u32 i = 0;
 493
 494         if (!np)
 495                 return -ENODEV;
 496
 497         nfuncs = of_get_child_count(np);
 498         if (nfuncs <= 0) {
 499                 dev_err(&pdev->dev, "no functions defined\n");
 500                 return -EINVAL;
 501         }
 502
 503         info->nfunctions = nfuncs;
 504         info->functions = devm_kzalloc(&pdev->dev, nfuncs * sizeof(struct imx_pmx_func),
 505                                         GFP_KERNEL);
 506         if (!info->functions)
 507                 return -ENOMEM;
 508
 509         info->ngroups = 0;
 510         for_each_child_of_node(np, child)
 511                 info->ngroups += of_get_child_count(child);
 512         info->groups = devm_kzalloc(&pdev->dev, info->ngroups * sizeof(struct imx_pin_group),
 513                                         GFP_KERNEL);
 514         if (!info->groups)
 515                 return -ENOMEM;
 516
 517         for_each_child_of_node(np, child) {
 518                 ret = imx_pinctrl_parse_functions(child, info, i++);
 519                 if (ret) {
 520                         dev_err(&pdev->dev, "failed to parse function\n");
 521                         return ret;
 522                 }
 523         }
 524
 525         return 0;
 526 }
 527
 528 int imx_pinctrl_probe(struct platform_device *pdev,
 529                       struct imx_pinctrl_soc_info *info)
 530 {
 531         struct imx_pinctrl *ipctl;
 532         struct resource *res;
 533         int ret;
 534
 535         if (!info || !info->pins || !info->npins) {
 536                 dev_err(&pdev->dev, "wrong pinctrl info\n");
 537                 return -EINVAL;
 538         }
 539         info->dev = &pdev->dev;
 540
 541         /* Create state holders etc for this driver */
 542         ipctl = devm_kzalloc(&pdev->dev, sizeof(*ipctl), GFP_KERNEL);
 543         if (!ipctl)
 544                 return -ENOMEM;
 545
 546         info->pin_regs = devm_kzalloc(&pdev->dev, sizeof(*info->pin_regs) *
 547                                       info->npins, GFP_KERNEL);
 548         if (!info->pin_regs)
 549                 return -ENOMEM;
 550
 551         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 552         if (!res)
 553                 return -ENOENT;
 554
 555         ipctl->base = devm_ioremap_resource(&pdev->dev, res);
 556         if (IS_ERR(ipctl->base))
 557                 return PTR_ERR(ipctl->base);
 558
 559         imx_pinctrl_desc.name = dev_name(&pdev->dev);
 560         imx_pinctrl_desc.pins = info->pins;
 561         imx_pinctrl_desc.npins = info->npins;
 562
 563         ret = imx_pinctrl_probe_dt(pdev, info);
 564         if (ret) {
 565                 dev_err(&pdev->dev, "fail to probe dt properties\n");
 566                 return ret;
 567         }
 568
 569         ipctl->info = info;
 570         ipctl->dev = info->dev;
 571         platform_set_drvdata(pdev, ipctl);
 572         ipctl->pctl = pinctrl_register(&imx_pinctrl_desc, &pdev->dev, ipctl);
 573         if (!ipctl->pctl) {
 574                 dev_err(&pdev->dev, "could not register IMX pinctrl driver\n");
 575                 return -EINVAL;
 576         }
 577
 578         dev_info(&pdev->dev, "initialized IMX pinctrl driver\n");
 579
 580         return 0;
 581 }
 582
 583 int imx_pinctrl_remove(struct platform_device *pdev)
 584 {
 585         struct imx_pinctrl *ipctl = platform_get_drvdata(pdev);
 586
 587         pinctrl_unregister(ipctl->pctl);
 588
 589         return 0;
 590 }