drivers/pinctrl/pxa/pinctrl-pxa2xx.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Marvell PXA2xx family pin control
   4  *
   5  * Copyright (C) 2015 Robert Jarzmik
   6  */
   7
   8 #include <linux/bitops.h>
   9 #include <linux/io.h>
  10 #include <linux/of.h>
  11 #include <linux/of_address.h>
  12 #include <linux/module.h>
  13 #include <linux/pinctrl/machine.h>
  14 #include <linux/pinctrl/pinconf.h>
  15 #include <linux/pinctrl/pinconf-generic.h>
  16 #include <linux/pinctrl/pinmux.h>
  17 #include <linux/pinctrl/pinctrl.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/slab.h>
  20
  21 #include "../pinctrl-utils.h"
  22 #include "pinctrl-pxa2xx.h"
  23
  24 static int pxa2xx_pctrl_get_groups_count(struct pinctrl_dev *pctldev)
  25 {
  26         struct pxa_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
  27
  28         return pctl->ngroups;
  29 }
  30
  31 static const char *pxa2xx_pctrl_get_group_name(struct pinctrl_dev *pctldev,
  32                                                unsigned tgroup)
  33 {
  34         struct pxa_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
  35         struct pxa_pinctrl_group *group = pctl->groups + tgroup;
  36
  37         return group->name;
  38 }
  39
  40 static int pxa2xx_pctrl_get_group_pins(struct pinctrl_dev *pctldev,
  41                                        unsigned tgroup,
  42                                        const unsigned **pins,
  43                                        unsigned *num_pins)
  44 {
  45         struct pxa_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
  46         struct pxa_pinctrl_group *group = pctl->groups + tgroup;
  47
  48         *pins = (unsigned *)&group->pin;
  49         *num_pins = 1;
  50
  51         return 0;
  52 }
  53
  54 static const struct pinctrl_ops pxa2xx_pctl_ops = {
  55 #ifdef CONFIG_OF
  56         .dt_node_to_map         = pinconf_generic_dt_node_to_map_all,
  57         .dt_free_map            = pinctrl_utils_free_map,
  58 #endif
  59         .get_groups_count       = pxa2xx_pctrl_get_groups_count,
  60         .get_group_name         = pxa2xx_pctrl_get_group_name,
  61         .get_group_pins         = pxa2xx_pctrl_get_group_pins,
  62 };
  63
  64 static struct pxa_desc_function *
  65 pxa_desc_by_func_group(struct pxa_pinctrl *pctl, const char *pin_name,
  66                        const char *func_name)
  67 {
  68         int i;
  69         struct pxa_desc_function *df;
  70
  71         for (i = 0; i < pctl->npins; i++) {
  72                 const struct pxa_desc_pin *pin = pctl->ppins + i;
  73
  74                 if (!strcmp(pin->pin.name, pin_name))
  75                         for (df = pin->functions; df->name; df++)
  76                                 if (!strcmp(df->name, func_name))
  77                                         return df;
  78         }
  79
  80         return NULL;
  81 }
  82
  83 static int pxa2xx_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
  84                                          struct pinctrl_gpio_range *range,
  85                                          unsigned pin,
  86                                          bool input)
  87 {
  88         struct pxa_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
  89         unsigned long flags;
  90         uint32_t val;
  91         void __iomem *gpdr;
  92
  93         gpdr = pctl->base_gpdr[pin / 32];
  94         dev_dbg(pctl->dev, "set_direction(pin=%d): dir=%d\n",
  95                 pin, !input);
  96
  97         spin_lock_irqsave(&pctl->lock, flags);
  98
  99         val = readl_relaxed(gpdr);
 100         val = (val & ~BIT(pin % 32)) | (input ? 0 : BIT(pin % 32));
 101         writel_relaxed(val, gpdr);
 102
 103         spin_unlock_irqrestore(&pctl->lock, flags);
 104
 105         return 0;
 106 }
 107
 108 static const char *pxa2xx_pmx_get_func_name(struct pinctrl_dev *pctldev,
 109                                             unsigned function)
 110 {
 111         struct pxa_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
 112         struct pxa_pinctrl_function *pf = pctl->functions + function;
 113
 114         return pf->name;
 115 }
 116
 117 static int pxa2xx_get_functions_count(struct pinctrl_dev *pctldev)
 118 {
 119         struct pxa_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
 120
 121         return pctl->nfuncs;
 122 }
 123
 124 static int pxa2xx_pmx_get_func_groups(struct pinctrl_dev *pctldev,
 125                                       unsigned function,
 126                                       const char * const **groups,
 127                                       unsigned * const num_groups)
 128 {
 129         struct pxa_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
 130         struct pxa_pinctrl_function *pf = pctl->functions + function;
 131
 132         *groups = pf->groups;
 133         *num_groups = pf->ngroups;
 134
 135         return 0;
 136 }
 137
 138 static int pxa2xx_pmx_set_mux(struct pinctrl_dev *pctldev, unsigned function,
 139                               unsigned tgroup)
 140 {
 141         struct pxa_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
 142         struct pxa_pinctrl_group *group = pctl->groups + tgroup;
 143         struct pxa_desc_function *df;
 144         int pin, shift;
 145         unsigned long flags;
 146         void __iomem *gafr, *gpdr;
 147         u32 val;
 148
 149
 150         df = pxa_desc_by_func_group(pctl, group->name,
 151                                     (pctl->functions + function)->name);
 152         if (!df)
 153                 return -EINVAL;
 154
 155         pin = group->pin;
 156         gafr = pctl->base_gafr[pin / 16];
 157         gpdr = pctl->base_gpdr[pin / 32];
 158         shift = (pin % 16) << 1;
 159         dev_dbg(pctl->dev, "set_mux(pin=%d): af=%d dir=%d\n",
 160                 pin, df->muxval >> 1, df->muxval & 0x1);
 161
 162         spin_lock_irqsave(&pctl->lock, flags);
 163
 164         val = readl_relaxed(gafr);
 165         val = (val & ~(0x3 << shift)) | ((df->muxval >> 1) << shift);
 166         writel_relaxed(val, gafr);
 167
 168         val = readl_relaxed(gpdr);
 169         val = (val & ~BIT(pin % 32)) | ((df->muxval & 1) ? BIT(pin % 32) : 0);
 170         writel_relaxed(val, gpdr);
 171
 172         spin_unlock_irqrestore(&pctl->lock, flags);
 173
 174         return 0;
 175 }
 176 static const struct pinmux_ops pxa2xx_pinmux_ops = {
 177         .get_functions_count = pxa2xx_get_functions_count,
 178         .get_function_name = pxa2xx_pmx_get_func_name,
 179         .get_function_groups = pxa2xx_pmx_get_func_groups,
 180         .set_mux = pxa2xx_pmx_set_mux,
 181         .gpio_set_direction = pxa2xx_pmx_gpio_set_direction,
 182 };
 183
 184 static int pxa2xx_pconf_group_get(struct pinctrl_dev *pctldev,
 185                                   unsigned group,
 186                                   unsigned long *config)
 187 {
 188         struct pxa_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
 189         struct pxa_pinctrl_group *g = pctl->groups + group;
 190         unsigned long flags;
 191         unsigned pin = g->pin;
 192         void __iomem *pgsr = pctl->base_pgsr[pin / 32];
 193         u32 val;
 194
 195         spin_lock_irqsave(&pctl->lock, flags);
 196         val = readl_relaxed(pgsr) & BIT(pin % 32);
 197         *config = val ? PIN_CONFIG_LOW_POWER_MODE : 0;
 198         spin_unlock_irqrestore(&pctl->lock, flags);
 199
 200         dev_dbg(pctl->dev, "get sleep gpio state(pin=%d) %d\n",
 201                 pin, !!val);
 202         return 0;
 203 }
 204
 205 static int pxa2xx_pconf_group_set(struct pinctrl_dev *pctldev,
 206                                   unsigned group,
 207                                   unsigned long *configs,
 208                                   unsigned num_configs)
 209 {
 210         struct pxa_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
 211         struct pxa_pinctrl_group *g = pctl->groups + group;
 212         unsigned long flags;
 213         unsigned pin = g->pin;
 214         void __iomem *pgsr = pctl->base_pgsr[pin / 32];
 215         int i, is_set = 0;
 216         u32 val;
 217
 218         for (i = 0; i < num_configs; i++) {
 219                 switch (pinconf_to_config_param(configs[i])) {
 220                 case PIN_CONFIG_LOW_POWER_MODE:
 221                         is_set = pinconf_to_config_argument(configs[i]);
 222                         break;
 223                 default:
 224                         return -EINVAL;
 225                 }
 226         }
 227
 228         dev_dbg(pctl->dev, "set sleep gpio state(pin=%d) %d\n",
 229                 pin, is_set);
 230
 231         spin_lock_irqsave(&pctl->lock, flags);
 232         val = readl_relaxed(pgsr);
 233         val = (val & ~BIT(pin % 32)) | (is_set ? BIT(pin % 32) : 0);
 234         writel_relaxed(val, pgsr);
 235         spin_unlock_irqrestore(&pctl->lock, flags);
 236
 237         return 0;
 238 }
 239
 240 static const struct pinconf_ops pxa2xx_pconf_ops = {
 241         .pin_config_group_get   = pxa2xx_pconf_group_get,
 242         .pin_config_group_set   = pxa2xx_pconf_group_set,
 243         .is_generic             = true,
 244 };
 245
 246 static struct pinctrl_desc pxa2xx_pinctrl_desc = {
 247         .confops        = &pxa2xx_pconf_ops,
 248         .pctlops        = &pxa2xx_pctl_ops,
 249         .pmxops         = &pxa2xx_pinmux_ops,
 250 };
 251
 252 static const struct pxa_pinctrl_function *
 253 pxa2xx_find_function(struct pxa_pinctrl *pctl, const char *fname,
 254                      const struct pxa_pinctrl_function *functions)
 255 {
 256         const struct pxa_pinctrl_function *func;
 257
 258         for (func = functions; func->name; func++)
 259                 if (!strcmp(fname, func->name))
 260                         return func;
 261
 262         return NULL;
 263 }
 264
 265 static int pxa2xx_build_functions(struct pxa_pinctrl *pctl)
 266 {
 267         int i;
 268         struct pxa_pinctrl_function *functions;
 269         struct pxa_desc_function *df;
 270
 271         /*
 272          * Each pin can have at most 6 alternate functions, and 2 gpio functions
 273          * which are common to each pin. As there are more than 2 pins without
 274          * alternate function, 6 * npins is an absolute high limit of the number
 275          * of functions.
 276          */
 277         functions = devm_kcalloc(pctl->dev, pctl->npins * 6,
 278                                  sizeof(*functions), GFP_KERNEL);
 279         if (!functions)
 280                 return -ENOMEM;
 281
 282         for (i = 0; i < pctl->npins; i++)
 283                 for (df = pctl->ppins[i].functions; df->name; df++)
 284                         if (!pxa2xx_find_function(pctl, df->name, functions))
 285                                 (functions + pctl->nfuncs++)->name = df->name;
 286         pctl->functions = devm_kmemdup(pctl->dev, functions,
 287                                        pctl->nfuncs * sizeof(*functions),
 288                                        GFP_KERNEL);
 289         if (!pctl->functions)
 290                 return -ENOMEM;
 291
 292         devm_kfree(pctl->dev, functions);
 293         return 0;
 294 }
 295
 296 static int pxa2xx_build_groups(struct pxa_pinctrl *pctl)
 297 {
 298         int i, j, ngroups;
 299         struct pxa_pinctrl_function *func;
 300         struct pxa_desc_function *df;
 301         char **gtmp;
 302
 303         gtmp = devm_kmalloc_array(pctl->dev, pctl->npins, sizeof(*gtmp),
 304                                   GFP_KERNEL);
 305         if (!gtmp)
 306                 return -ENOMEM;
 307
 308         for (i = 0; i < pctl->nfuncs; i++) {
 309                 ngroups = 0;
 310                 for (j = 0; j < pctl->npins; j++)
 311                         for (df = pctl->ppins[j].functions; df->name;
 312                              df++)
 313                                 if (!strcmp(pctl->functions[i].name,
 314                                             df->name))
 315                                         gtmp[ngroups++] = (char *)
 316                                                 pctl->ppins[j].pin.name;
 317                 func = pctl->functions + i;
 318                 func->ngroups = ngroups;
 319                 func->groups =
 320                         devm_kmalloc_array(pctl->dev, ngroups,
 321                                            sizeof(char *), GFP_KERNEL);
 322                 if (!func->groups)
 323                         return -ENOMEM;
 324
 325                 memcpy(func->groups, gtmp, ngroups * sizeof(*gtmp));
 326         }
 327
 328         devm_kfree(pctl->dev, gtmp);
 329         return 0;
 330 }
 331
 332 static int pxa2xx_build_state(struct pxa_pinctrl *pctl,
 333                               const struct pxa_desc_pin *ppins, int npins)
 334 {
 335         struct pxa_pinctrl_group *group;
 336         struct pinctrl_pin_desc *pins;
 337         int ret, i;
 338
 339         pctl->npins = npins;
 340         pctl->ppins = ppins;
 341         pctl->ngroups = npins;
 342
 343         pctl->desc.npins = npins;
 344         pins = devm_kcalloc(pctl->dev, npins, sizeof(*pins), GFP_KERNEL);
 345         if (!pins)
 346                 return -ENOMEM;
 347
 348         pctl->desc.pins = pins;
 349         for (i = 0; i < npins; i++)
 350                 pins[i] = ppins[i].pin;
 351
 352         pctl->groups = devm_kmalloc_array(pctl->dev, pctl->ngroups,
 353                                           sizeof(*pctl->groups), GFP_KERNEL);
 354         if (!pctl->groups)
 355                 return -ENOMEM;
 356
 357         for (i = 0; i < npins; i++) {
 358                 group = pctl->groups + i;
 359                 group->name = ppins[i].pin.name;
 360                 group->pin = ppins[i].pin.number;
 361         }
 362
 363         ret = pxa2xx_build_functions(pctl);
 364         if (ret)
 365                 return ret;
 366
 367         ret = pxa2xx_build_groups(pctl);
 368         if (ret)
 369                 return ret;
 370
 371         return 0;
 372 }
 373
 374 int pxa2xx_pinctrl_init(struct platform_device *pdev,
 375                         const struct pxa_desc_pin *ppins, int npins,
 376                         void __iomem *base_gafr[], void __iomem *base_gpdr[],
 377                         void __iomem *base_pgsr[])
 378 {
 379         struct pxa_pinctrl *pctl;
 380         int ret, i, maxpin = 0;
 381
 382         for (i = 0; i < npins; i++)
 383                 maxpin = max_t(int, ppins[i].pin.number, maxpin);
 384
 385         pctl = devm_kzalloc(&pdev->dev, sizeof(*pctl), GFP_KERNEL);
 386         if (!pctl)
 387                 return -ENOMEM;
 388         pctl->base_gafr = devm_kcalloc(&pdev->dev, roundup(maxpin, 16),
 389                                        sizeof(*pctl->base_gafr), GFP_KERNEL);
 390         pctl->base_gpdr = devm_kcalloc(&pdev->dev, roundup(maxpin, 32),
 391                                        sizeof(*pctl->base_gpdr), GFP_KERNEL);
 392         pctl->base_pgsr = devm_kcalloc(&pdev->dev, roundup(maxpin, 32),
 393                                        sizeof(*pctl->base_pgsr), GFP_KERNEL);
 394         if (!pctl->base_gafr || !pctl->base_gpdr || !pctl->base_pgsr)
 395                 return -ENOMEM;
 396
 397         platform_set_drvdata(pdev, pctl);
 398         spin_lock_init(&pctl->lock);
 399
 400         pctl->dev = &pdev->dev;
 401         pctl->desc = pxa2xx_pinctrl_desc;
 402         pctl->desc.name = dev_name(&pdev->dev);
 403         pctl->desc.owner = THIS_MODULE;
 404
 405         for (i = 0; i < roundup(maxpin, 16); i += 16)
 406                 pctl->base_gafr[i / 16] = base_gafr[i / 16];
 407         for (i = 0; i < roundup(maxpin, 32); i += 32) {
 408                 pctl->base_gpdr[i / 32] = base_gpdr[i / 32];
 409                 pctl->base_pgsr[i / 32] = base_pgsr[i / 32];
 410         }
 411
 412         ret = pxa2xx_build_state(pctl, ppins, npins);
 413         if (ret)
 414                 return ret;
 415
 416         pctl->pctl_dev = devm_pinctrl_register(&pdev->dev, &pctl->desc, pctl);
 417         if (IS_ERR(pctl->pctl_dev)) {
 418                 dev_err(&pdev->dev, "couldn't register pinctrl driver\n");
 419                 return PTR_ERR(pctl->pctl_dev);
 420         }
 421
 422         dev_info(&pdev->dev, "initialized pxa2xx pinctrl driver\n");
 423
 424         return 0;
 425 }
 426 EXPORT_SYMBOL_GPL(pxa2xx_pinctrl_init);
 427
 428 MODULE_AUTHOR("Robert Jarzmik <robert.jarzmik@free.fr>");
 429 MODULE_DESCRIPTION("Marvell PXA2xx pinctrl driver");
 430 MODULE_LICENSE("GPL v2");