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 struct imx_pin_reg *imx_find_pin_reg(
  58                                 const struct imx_pinctrl_soc_info *info,
  59                                 unsigned pin, bool is_mux, unsigned mux)
  60 {
  61         const struct imx_pin_reg *pin_reg = NULL;
  62         int i;
  63
  64         for (i = 0; i < info->npin_regs; i++) {
  65                 pin_reg = &info->pin_regs[i];
  66                 if (pin_reg->pid != pin)
  67                         continue;
  68                 if (!is_mux)
  69                         break;
  70                 else if (pin_reg->mux_mode == (mux & IMX_MUX_MASK))
  71                         break;
  72         }
  73
  74         if (!pin_reg) {
  75                 dev_err(info->dev, "Pin(%s): unable to find pin reg map\n",
  76                         info->pins[pin].name);
  77                 return NULL;
  78         }
  79
  80         return pin_reg;
  81 }
  82
  83 static const inline struct imx_pin_group *imx_pinctrl_find_group_by_name(
  84                                 const struct imx_pinctrl_soc_info *info,
  85                                 const char *name)
  86 {
  87         const struct imx_pin_group *grp = NULL;
  88         int i;
  89
  90         for (i = 0; i < info->ngroups; i++) {
  91                 if (!strcmp(info->groups[i].name, name)) {
  92                         grp = &info->groups[i];
  93                         break;
  94                 }
  95         }
  96
  97         return grp;
  98 }
  99
 100 static int imx_get_groups_count(struct pinctrl_dev *pctldev)
 101 {
 102         struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
 103         const struct imx_pinctrl_soc_info *info = ipctl->info;
 104
 105         return info->ngroups;
 106 }
 107
 108 static const char *imx_get_group_name(struct pinctrl_dev *pctldev,
 109                                        unsigned selector)
 110 {
 111         struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
 112         const struct imx_pinctrl_soc_info *info = ipctl->info;
 113
 114         return info->groups[selector].name;
 115 }
 116
 117 static int imx_get_group_pins(struct pinctrl_dev *pctldev, unsigned selector,
 118                                const unsigned **pins,
 119                                unsigned *npins)
 120 {
 121         struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
 122         const struct imx_pinctrl_soc_info *info = ipctl->info;
 123
 124         if (selector >= info->ngroups)
 125                 return -EINVAL;
 126
 127         *pins = info->groups[selector].pins;
 128         *npins = info->groups[selector].npins;
 129
 130         return 0;
 131 }
 132
 133 static void imx_pin_dbg_show(struct pinctrl_dev *pctldev, struct seq_file *s,
 134                    unsigned offset)
 135 {
 136         seq_printf(s, "%s", dev_name(pctldev->dev));
 137 }
 138
 139 static int imx_dt_node_to_map(struct pinctrl_dev *pctldev,
 140                         struct device_node *np,
 141                         struct pinctrl_map **map, unsigned *num_maps)
 142 {
 143         struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
 144         const struct imx_pinctrl_soc_info *info = ipctl->info;
 145         const struct imx_pin_group *grp;
 146         struct pinctrl_map *new_map;
 147         struct device_node *parent;
 148         int map_num = 1;
 149         int i, j;
 150
 151         /*
 152          * first find the group of this node and check if we need create
 153          * config maps for pins
 154          */
 155         grp = imx_pinctrl_find_group_by_name(info, np->name);
 156         if (!grp) {
 157                 dev_err(info->dev, "unable to find group for node %s\n",
 158                         np->name);
 159                 return -EINVAL;
 160         }
 161
 162         for (i = 0; i < grp->npins; i++) {
 163                 if (!(grp->configs[i] & IMX_NO_PAD_CTL))
 164                         map_num++;
 165         }
 166
 167         new_map = kmalloc(sizeof(struct pinctrl_map) * map_num, GFP_KERNEL);
 168         if (!new_map)
 169                 return -ENOMEM;
 170
 171         *map = new_map;
 172         *num_maps = map_num;
 173
 174         /* create mux map */
 175         parent = of_get_parent(np);
 176         if (!parent) {
 177                 kfree(new_map);
 178                 return -EINVAL;
 179         }
 180         new_map[0].type = PIN_MAP_TYPE_MUX_GROUP;
 181         new_map[0].data.mux.function = parent->name;
 182         new_map[0].data.mux.group = np->name;
 183         of_node_put(parent);
 184
 185         /* create config map */
 186         new_map++;
 187         for (i = j = 0; i < grp->npins; i++) {
 188                 if (!(grp->configs[i] & IMX_NO_PAD_CTL)) {
 189                         new_map[j].type = PIN_MAP_TYPE_CONFIGS_PIN;
 190                         new_map[j].data.configs.group_or_pin =
 191                                         pin_get_name(pctldev, grp->pins[i]);
 192                         new_map[j].data.configs.configs = &grp->configs[i];
 193                         new_map[j].data.configs.num_configs = 1;
 194                         j++;
 195                 }
 196         }
 197
 198         dev_dbg(pctldev->dev, "maps: function %s group %s num %d\n",
 199                 (*map)->data.mux.function, (*map)->data.mux.group, map_num);
 200
 201         return 0;
 202 }
 203
 204 static void imx_dt_free_map(struct pinctrl_dev *pctldev,
 205                                 struct pinctrl_map *map, unsigned num_maps)
 206 {
 207         kfree(map);
 208 }
 209
 210 static struct pinctrl_ops imx_pctrl_ops = {
 211         .get_groups_count = imx_get_groups_count,
 212         .get_group_name = imx_get_group_name,
 213         .get_group_pins = imx_get_group_pins,
 214         .pin_dbg_show = imx_pin_dbg_show,
 215         .dt_node_to_map = imx_dt_node_to_map,
 216         .dt_free_map = imx_dt_free_map,
 217
 218 };
 219
 220 static int imx_pmx_enable(struct pinctrl_dev *pctldev, unsigned selector,
 221                            unsigned group)
 222 {
 223         struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
 224         const struct imx_pinctrl_soc_info *info = ipctl->info;
 225         const struct imx_pin_reg *pin_reg;
 226         const unsigned *pins, *mux;
 227         unsigned int npins, pin_id;
 228         int i;
 229
 230         /*
 231          * Configure the mux mode for each pin in the group for a specific
 232          * function.
 233          */
 234         pins = info->groups[group].pins;
 235         npins = info->groups[group].npins;
 236         mux = info->groups[group].mux_mode;
 237
 238         WARN_ON(!pins || !npins || !mux);
 239
 240         dev_dbg(ipctl->dev, "enable function %s group %s\n",
 241                 info->functions[selector].name, info->groups[group].name);
 242
 243         for (i = 0; i < npins; i++) {
 244                 pin_id = pins[i];
 245
 246                 pin_reg = imx_find_pin_reg(info, pin_id, 1, mux[i]);
 247                 if (!pin_reg)
 248                         return -EINVAL;
 249
 250                 if (!pin_reg->mux_reg) {
 251                         dev_err(ipctl->dev, "Pin(%s) does not support mux function\n",
 252                                 info->pins[pin_id].name);
 253                         return -EINVAL;
 254                 }
 255
 256                 writel(mux[i], ipctl->base + pin_reg->mux_reg);
 257                 dev_dbg(ipctl->dev, "write: offset 0x%x val 0x%x\n",
 258                         pin_reg->mux_reg, mux[i]);
 259
 260                 /* some pins also need select input setting, set it if found */
 261                 if (pin_reg->input_reg) {
 262                         writel(pin_reg->input_val, ipctl->base + pin_reg->input_reg);
 263                         dev_dbg(ipctl->dev,
 264                                 "==>select_input: offset 0x%x val 0x%x\n",
 265                                 pin_reg->input_reg, pin_reg->input_val);
 266                 }
 267         }
 268
 269         return 0;
 270 }
 271
 272 static int imx_pmx_get_funcs_count(struct pinctrl_dev *pctldev)
 273 {
 274         struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
 275         const struct imx_pinctrl_soc_info *info = ipctl->info;
 276
 277         return info->nfunctions;
 278 }
 279
 280 static const char *imx_pmx_get_func_name(struct pinctrl_dev *pctldev,
 281                                           unsigned selector)
 282 {
 283         struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
 284         const struct imx_pinctrl_soc_info *info = ipctl->info;
 285
 286         return info->functions[selector].name;
 287 }
 288
 289 static int imx_pmx_get_groups(struct pinctrl_dev *pctldev, unsigned selector,
 290                                const char * const **groups,
 291                                unsigned * const num_groups)
 292 {
 293         struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
 294         const struct imx_pinctrl_soc_info *info = ipctl->info;
 295
 296         *groups = info->functions[selector].groups;
 297         *num_groups = info->functions[selector].num_groups;
 298
 299         return 0;
 300 }
 301
 302 static struct pinmux_ops imx_pmx_ops = {
 303         .get_functions_count = imx_pmx_get_funcs_count,
 304         .get_function_name = imx_pmx_get_func_name,
 305         .get_function_groups = imx_pmx_get_groups,
 306         .enable = imx_pmx_enable,
 307 };
 308
 309 static int imx_pinconf_get(struct pinctrl_dev *pctldev,
 310                              unsigned pin_id, unsigned long *config)
 311 {
 312         struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
 313         const struct imx_pinctrl_soc_info *info = ipctl->info;
 314         const struct imx_pin_reg *pin_reg;
 315
 316         pin_reg = imx_find_pin_reg(info, pin_id, 0, 0);
 317         if (!pin_reg)
 318                 return -EINVAL;
 319
 320         if (!pin_reg->conf_reg) {
 321                 dev_err(info->dev, "Pin(%s) does not support config function\n",
 322                         info->pins[pin_id].name);
 323                 return -EINVAL;
 324         }
 325
 326         *config = readl(ipctl->base + pin_reg->conf_reg);
 327
 328         return 0;
 329 }
 330
 331 static int imx_pinconf_set(struct pinctrl_dev *pctldev,
 332                              unsigned pin_id, unsigned long config)
 333 {
 334         struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
 335         const struct imx_pinctrl_soc_info *info = ipctl->info;
 336         const struct imx_pin_reg *pin_reg;
 337
 338         pin_reg = imx_find_pin_reg(info, pin_id, 0, 0);
 339         if (!pin_reg)
 340                 return -EINVAL;
 341
 342         if (!pin_reg->conf_reg) {
 343                 dev_err(info->dev, "Pin(%s) does not support config function\n",
 344                         info->pins[pin_id].name);
 345                 return -EINVAL;
 346         }
 347
 348         dev_dbg(ipctl->dev, "pinconf set pin %s\n",
 349                 info->pins[pin_id].name);
 350
 351         writel(config, ipctl->base + pin_reg->conf_reg);
 352         dev_dbg(ipctl->dev, "write: offset 0x%x val 0x%lx\n",
 353                 pin_reg->conf_reg, config);
 354
 355         return 0;
 356 }
 357
 358 static void imx_pinconf_dbg_show(struct pinctrl_dev *pctldev,
 359                                    struct seq_file *s, unsigned pin_id)
 360 {
 361         struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
 362         const struct imx_pinctrl_soc_info *info = ipctl->info;
 363         const struct imx_pin_reg *pin_reg;
 364         unsigned long config;
 365
 366         pin_reg = imx_find_pin_reg(info, pin_id, 0, 0);
 367         if (!pin_reg || !pin_reg->conf_reg) {
 368                 seq_printf(s, "N/A");
 369                 return;
 370         }
 371
 372         config = readl(ipctl->base + pin_reg->conf_reg);
 373         seq_printf(s, "0x%lx", config);
 374 }
 375
 376 static void imx_pinconf_group_dbg_show(struct pinctrl_dev *pctldev,
 377                                          struct seq_file *s, unsigned group)
 378 {
 379         struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
 380         const struct imx_pinctrl_soc_info *info = ipctl->info;
 381         struct imx_pin_group *grp;
 382         unsigned long config;
 383         const char *name;
 384         int i, ret;
 385
 386         if (group > info->ngroups)
 387                 return;
 388
 389         seq_printf(s, "\n");
 390         grp = &info->groups[group];
 391         for (i = 0; i < grp->npins; i++) {
 392                 name = pin_get_name(pctldev, grp->pins[i]);
 393                 ret = imx_pinconf_get(pctldev, grp->pins[i], &config);
 394                 if (ret)
 395                         return;
 396                 seq_printf(s, "%s: 0x%lx", name, config);
 397         }
 398 }
 399
 400 struct pinconf_ops imx_pinconf_ops = {
 401         .pin_config_get = imx_pinconf_get,
 402         .pin_config_set = imx_pinconf_set,
 403         .pin_config_dbg_show = imx_pinconf_dbg_show,
 404         .pin_config_group_dbg_show = imx_pinconf_group_dbg_show,
 405 };
 406
 407 static struct pinctrl_desc imx_pinctrl_desc = {
 408         .pctlops = &imx_pctrl_ops,
 409         .pmxops = &imx_pmx_ops,
 410         .confops = &imx_pinconf_ops,
 411         .owner = THIS_MODULE,
 412 };
 413
 414 /* decode pin id and mux from pin function id got from device tree*/
 415 static int imx_pinctrl_get_pin_id_and_mux(const struct imx_pinctrl_soc_info *info,
 416                                 unsigned int pin_func_id, unsigned int *pin_id,
 417                                 unsigned int *mux)
 418 {
 419         if (pin_func_id > info->npin_regs)
 420                 return -EINVAL;
 421
 422         *pin_id = info->pin_regs[pin_func_id].pid;
 423         *mux = info->pin_regs[pin_func_id].mux_mode;
 424
 425         return 0;
 426 }
 427
 428 static int __devinit imx_pinctrl_parse_groups(struct device_node *np,
 429                                 struct imx_pin_group *grp,
 430                                 struct imx_pinctrl_soc_info *info,
 431                                 u32 index)
 432 {
 433         unsigned int pin_func_id;
 434         int ret, size;
 435         const __be32 *list;
 436         int i, j;
 437         u32 config;
 438
 439         dev_dbg(info->dev, "group(%d): %s\n", index, np->name);
 440
 441         /* Initialise group */
 442         grp->name = np->name;
 443
 444         /*
 445          * the binding format is fsl,pins = <PIN_FUNC_ID CONFIG ...>,
 446          * do sanity check and calculate pins number
 447          */
 448         list = of_get_property(np, "fsl,pins", &size);
 449         /* we do not check return since it's safe node passed down */
 450         size /= sizeof(*list);
 451         if (!size || size % 2) {
 452                 dev_err(info->dev, "wrong pins number or pins and configs should be pairs\n");
 453                 return -EINVAL;
 454         }
 455
 456         grp->npins = size / 2;
 457         grp->pins = devm_kzalloc(info->dev, grp->npins * sizeof(unsigned int),
 458                                 GFP_KERNEL);
 459         grp->mux_mode = devm_kzalloc(info->dev, grp->npins * sizeof(unsigned int),
 460                                 GFP_KERNEL);
 461         grp->configs = devm_kzalloc(info->dev, grp->npins * sizeof(unsigned long),
 462                                 GFP_KERNEL);
 463         for (i = 0, j = 0; i < size; i += 2, j++) {
 464                 pin_func_id = be32_to_cpu(*list++);
 465                 ret = imx_pinctrl_get_pin_id_and_mux(info, pin_func_id,
 466                                         &grp->pins[j], &grp->mux_mode[j]);
 467                 if (ret) {
 468                         dev_err(info->dev, "get invalid pin function id\n");
 469                         return -EINVAL;
 470                 }
 471                 /* SION bit is in mux register */
 472                 config = be32_to_cpu(*list++);
 473                 if (config & IMX_PAD_SION)
 474                         grp->mux_mode[j] |= IOMUXC_CONFIG_SION;
 475                 grp->configs[j] = config & ~IMX_PAD_SION;
 476         }
 477
 478 #ifdef DEBUG
 479         IMX_PMX_DUMP(info, grp->pins, grp->mux_mode, grp->configs, grp->npins);
 480 #endif
 481
 482         return 0;
 483 }
 484
 485 static int __devinit imx_pinctrl_parse_functions(struct device_node *np,
 486                         struct imx_pinctrl_soc_info *info, u32 index)
 487 {
 488         struct device_node *child;
 489         struct imx_pmx_func *func;
 490         struct imx_pin_group *grp;
 491         int ret;
 492         static u32 grp_index;
 493         u32 i = 0;
 494
 495         dev_dbg(info->dev, "parse function(%d): %s\n", index, np->name);
 496
 497         func = &info->functions[index];
 498
 499         /* Initialise function */
 500         func->name = np->name;
 501         func->num_groups = of_get_child_count(np);
 502         if (func->num_groups <= 0) {
 503                 dev_err(info->dev, "no groups defined\n");
 504                 return -EINVAL;
 505         }
 506         func->groups = devm_kzalloc(info->dev,
 507                         func->num_groups * sizeof(char *), GFP_KERNEL);
 508
 509         for_each_child_of_node(np, child) {
 510                 func->groups[i] = child->name;
 511                 grp = &info->groups[grp_index++];
 512                 ret = imx_pinctrl_parse_groups(child, grp, info, i++);
 513                 if (ret)
 514                         return ret;
 515         }
 516
 517         return 0;
 518 }
 519
 520 static int __devinit imx_pinctrl_probe_dt(struct platform_device *pdev,
 521                                 struct imx_pinctrl_soc_info *info)
 522 {
 523         struct device_node *np = pdev->dev.of_node;
 524         struct device_node *child;
 525         int ret;
 526         u32 nfuncs = 0;
 527         u32 i = 0;
 528
 529         if (!np)
 530                 return -ENODEV;
 531
 532         nfuncs = of_get_child_count(np);
 533         if (nfuncs <= 0) {
 534                 dev_err(&pdev->dev, "no functions defined\n");
 535                 return -EINVAL;
 536         }
 537
 538         info->nfunctions = nfuncs;
 539         info->functions = devm_kzalloc(&pdev->dev, nfuncs * sizeof(struct imx_pmx_func),
 540                                         GFP_KERNEL);
 541         if (!info->functions)
 542                 return -ENOMEM;
 543
 544         info->ngroups = 0;
 545         for_each_child_of_node(np, child)
 546                 info->ngroups += of_get_child_count(child);
 547         info->groups = devm_kzalloc(&pdev->dev, info->ngroups * sizeof(struct imx_pin_group),
 548                                         GFP_KERNEL);
 549         if (!info->groups)
 550                 return -ENOMEM;
 551
 552         for_each_child_of_node(np, child) {
 553                 ret = imx_pinctrl_parse_functions(child, info, i++);
 554                 if (ret) {
 555                         dev_err(&pdev->dev, "failed to parse function\n");
 556                         return ret;
 557                 }
 558         }
 559
 560         return 0;
 561 }
 562
 563 int __devinit imx_pinctrl_probe(struct platform_device *pdev,
 564                                 struct imx_pinctrl_soc_info *info)
 565 {
 566         struct imx_pinctrl *ipctl;
 567         struct resource *res;
 568         int ret;
 569
 570         if (!info || !info->pins || !info->npins
 571                   || !info->pin_regs || !info->npin_regs) {
 572                 dev_err(&pdev->dev, "wrong pinctrl info\n");
 573                 return -EINVAL;
 574         }
 575         info->dev = &pdev->dev;
 576
 577         /* Create state holders etc for this driver */
 578         ipctl = devm_kzalloc(&pdev->dev, sizeof(*ipctl), GFP_KERNEL);
 579         if (!ipctl)
 580                 return -ENOMEM;
 581
 582         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 583         if (!res)
 584                 return -ENOENT;
 585
 586         ipctl->base = devm_request_and_ioremap(&pdev->dev, res);
 587         if (!ipctl->base)
 588                 return -EBUSY;
 589
 590         imx_pinctrl_desc.name = dev_name(&pdev->dev);
 591         imx_pinctrl_desc.pins = info->pins;
 592         imx_pinctrl_desc.npins = info->npins;
 593
 594         ret = imx_pinctrl_probe_dt(pdev, info);
 595         if (ret) {
 596                 dev_err(&pdev->dev, "fail to probe dt properties\n");
 597                 return ret;
 598         }
 599
 600         ipctl->info = info;
 601         ipctl->dev = info->dev;
 602         platform_set_drvdata(pdev, ipctl);
 603         ipctl->pctl = pinctrl_register(&imx_pinctrl_desc, &pdev->dev, ipctl);
 604         if (!ipctl->pctl) {
 605                 dev_err(&pdev->dev, "could not register IMX pinctrl driver\n");
 606                 return -EINVAL;
 607         }
 608
 609         dev_info(&pdev->dev, "initialized IMX pinctrl driver\n");
 610
 611         return 0;
 612 }
 613
 614 int __devexit imx_pinctrl_remove(struct platform_device *pdev)
 615 {
 616         struct imx_pinctrl *ipctl = platform_get_drvdata(pdev);
 617
 618         pinctrl_unregister(ipctl->pctl);
 619
 620         return 0;
 621 }