target/linux/ramips/patches-4.4/0025-pinctrl-ralink-add-pinctrl-driver.patch

   1 From 7adbe9a88c33c6e362a10b109d963b5500a21f00 Mon Sep 17 00:00:00 2001
   2 From: John Crispin <blogic@openwrt.org>
   3 Date: Sun, 27 Jul 2014 09:34:05 +0100
   4 Subject: [PATCH 25/53] pinctrl: ralink: add pinctrl driver
   5
   6 Signed-off-by: John Crispin <blogic@openwrt.org>
   7 ---
   8  arch/mips/Kconfig                |    2 +
   9  drivers/pinctrl/Kconfig          |    5 +
  10  drivers/pinctrl/Makefile         |    1 +
  11  drivers/pinctrl/pinctrl-rt2880.c |  474 ++++++++++++++++++++++++++++++++++++++
  12  4 files changed, 482 insertions(+)
  13  create mode 100644 drivers/pinctrl/pinctrl-rt2880.c
  14
  15 --- a/arch/mips/Kconfig
  16 +++ b/arch/mips/Kconfig
  17 @@ -585,6 +585,8 @@ config RALINK
  18         select CLKDEV_LOOKUP
  19         select ARCH_HAS_RESET_CONTROLLER
  20         select RESET_CONTROLLER
  21 +       select PINCTRL
  22 +       select PINCTRL_RT2880
  23
  24  config SGI_IP22
  25         bool "SGI IP22 (Indy/Indigo2)"
  26 --- a/drivers/pinctrl/Kconfig
  27 +++ b/drivers/pinctrl/Kconfig
  28 @@ -114,6 +114,11 @@ config PINCTRL_LPC18XX
  29         help
  30           Pinctrl driver for NXP LPC18xx/43xx System Control Unit (SCU).
  31
  32 +config PINCTRL_RT2880
  33 +       bool
  34 +       depends on RALINK
  35 +       select PINMUX
  36 +
  37  config PINCTRL_FALCON
  38         bool
  39         depends on SOC_FALCON
  40 --- a/drivers/pinctrl/Makefile
  41 +++ b/drivers/pinctrl/Makefile
  42 @@ -20,6 +20,7 @@ obj-$(CONFIG_PINCTRL_MESON)   += meson/
  43  obj-$(CONFIG_PINCTRL_PALMAS)   += pinctrl-palmas.o
  44  obj-$(CONFIG_PINCTRL_PISTACHIO)        += pinctrl-pistachio.o
  45  obj-$(CONFIG_PINCTRL_ROCKCHIP) += pinctrl-rockchip.o
  46 +obj-$(CONFIG_PINCTRL_RT2880)   += pinctrl-rt2880.o
  47  obj-$(CONFIG_PINCTRL_SINGLE)   += pinctrl-single.o
  48  obj-$(CONFIG_PINCTRL_SIRF)     += sirf/
  49  obj-$(CONFIG_PINCTRL_TEGRA)    += pinctrl-tegra.o
  50 --- /dev/null
  51 +++ b/drivers/pinctrl/pinctrl-rt2880.c
  52 @@ -0,0 +1,472 @@
  53 +/*
  54 + *  linux/drivers/pinctrl/pinctrl-rt2880.c
  55 + *
  56 + *  This program is free software; you can redistribute it and/or modify
  57 + *  it under the terms of the GNU General Public License version 2 as
  58 + *  publishhed by the Free Software Foundation.
  59 + *
  60 + *  Copyright (C) 2013 John Crispin <blogic@openwrt.org>
  61 + */
  62 +
  63 +#include <linux/module.h>
  64 +#include <linux/device.h>
  65 +#include <linux/io.h>
  66 +#include <linux/platform_device.h>
  67 +#include <linux/slab.h>
  68 +#include <linux/of.h>
  69 +#include <linux/pinctrl/pinctrl.h>
  70 +#include <linux/pinctrl/pinconf.h>
  71 +#include <linux/pinctrl/pinmux.h>
  72 +#include <linux/pinctrl/consumer.h>
  73 +#include <linux/pinctrl/machine.h>
  74 +
  75 +#include <asm/mach-ralink/ralink_regs.h>
  76 +#include <asm/mach-ralink/pinmux.h>
  77 +#include <asm/mach-ralink/mt7620.h>
  78 +
  79 +#include "core.h"
  80 +
  81 +#define SYSC_REG_GPIO_MODE     0x60
  82 +#define SYSC_REG_GPIO_MODE2    0x64
  83 +
  84 +struct rt2880_priv {
  85 +       struct device *dev;
  86 +
  87 +       struct pinctrl_pin_desc *pads;
  88 +       struct pinctrl_desc *desc;
  89 +
  90 +       struct rt2880_pmx_func **func;
  91 +       int func_count;
  92 +
  93 +       struct rt2880_pmx_group *groups;
  94 +       const char **group_names;
  95 +       int group_count;
  96 +
  97 +       uint8_t *gpio;
  98 +       int max_pins;
  99 +};
 100 +
 101 +static int rt2880_get_group_count(struct pinctrl_dev *pctrldev)
 102 +{
 103 +       struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev);
 104 +
 105 +       return p->group_count;
 106 +}
 107 +
 108 +static const char *rt2880_get_group_name(struct pinctrl_dev *pctrldev,
 109 +                                        unsigned group)
 110 +{
 111 +       struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev);
 112 +
 113 +       if (group >= p->group_count)
 114 +               return NULL;
 115 +
 116 +       return p->group_names[group];
 117 +}
 118 +
 119 +static int rt2880_get_group_pins(struct pinctrl_dev *pctrldev,
 120 +                                unsigned group,
 121 +                                const unsigned **pins,
 122 +                                unsigned *num_pins)
 123 +{
 124 +       struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev);
 125 +
 126 +       if (group >= p->group_count)
 127 +               return -EINVAL;
 128 +
 129 +       *pins = p->groups[group].func[0].pins;
 130 +       *num_pins = p->groups[group].func[0].pin_count;
 131 +
 132 +       return 0;
 133 +}
 134 +
 135 +static void rt2880_pinctrl_dt_free_map(struct pinctrl_dev *pctrldev,
 136 +                                   struct pinctrl_map *map, unsigned num_maps)
 137 +{
 138 +       int i;
 139 +
 140 +       for (i = 0; i < num_maps; i++)
 141 +               if (map[i].type == PIN_MAP_TYPE_CONFIGS_PIN ||
 142 +                   map[i].type == PIN_MAP_TYPE_CONFIGS_GROUP)
 143 +                       kfree(map[i].data.configs.configs);
 144 +       kfree(map);
 145 +}
 146 +
 147 +static void rt2880_pinctrl_pin_dbg_show(struct pinctrl_dev *pctrldev,
 148 +                                       struct seq_file *s,
 149 +                                       unsigned offset)
 150 +{
 151 +       seq_printf(s, "ralink pio");
 152 +}
 153 +
 154 +static void rt2880_pinctrl_dt_subnode_to_map(struct pinctrl_dev *pctrldev,
 155 +                               struct device_node *np,
 156 +                               struct pinctrl_map **map)
 157 +{
 158 +        const char *function;
 159 +       int func = of_property_read_string(np, "ralink,function", &function);
 160 +       int grps = of_property_count_strings(np, "ralink,group");
 161 +       int i;
 162 +
 163 +       if (func || !grps)
 164 +               return;
 165 +
 166 +       for (i = 0; i < grps; i++) {
 167 +               const char *group;
 168 +
 169 +               of_property_read_string_index(np, "ralink,group", i, &group);
 170 +
 171 +               (*map)->type = PIN_MAP_TYPE_MUX_GROUP;
 172 +               (*map)->name = function;
 173 +               (*map)->data.mux.group = group;
 174 +               (*map)->data.mux.function = function;
 175 +               (*map)++;
 176 +       }
 177 +}
 178 +
 179 +static int rt2880_pinctrl_dt_node_to_map(struct pinctrl_dev *pctrldev,
 180 +                               struct device_node *np_config,
 181 +                               struct pinctrl_map **map,
 182 +                               unsigned *num_maps)
 183 +{
 184 +       int max_maps = 0;
 185 +       struct pinctrl_map *tmp;
 186 +       struct device_node *np;
 187 +
 188 +       for_each_child_of_node(np_config, np) {
 189 +               int ret = of_property_count_strings(np, "ralink,group");
 190 +
 191 +               if (ret >= 0)
 192 +                       max_maps += ret;
 193 +       }
 194 +
 195 +       if (!max_maps)
 196 +               return max_maps;
 197 +
 198 +       *map = kzalloc(max_maps * sizeof(struct pinctrl_map), GFP_KERNEL);
 199 +       if (!*map)
 200 +               return -ENOMEM;
 201 +
 202 +       tmp = *map;
 203 +
 204 +       for_each_child_of_node(np_config, np)
 205 +               rt2880_pinctrl_dt_subnode_to_map(pctrldev, np, &tmp);
 206 +       *num_maps = max_maps;
 207 +
 208 +       return 0;
 209 +}
 210 +
 211 +static const struct pinctrl_ops rt2880_pctrl_ops = {
 212 +       .get_groups_count       = rt2880_get_group_count,
 213 +       .get_group_name         = rt2880_get_group_name,
 214 +       .get_group_pins         = rt2880_get_group_pins,
 215 +       .pin_dbg_show           = rt2880_pinctrl_pin_dbg_show,
 216 +       .dt_node_to_map         = rt2880_pinctrl_dt_node_to_map,
 217 +       .dt_free_map            = rt2880_pinctrl_dt_free_map,
 218 +};
 219 +
 220 +static int rt2880_pmx_func_count(struct pinctrl_dev *pctrldev)
 221 +{
 222 +       struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev);
 223 +
 224 +       return p->func_count;
 225 +}
 226 +
 227 +static const char *rt2880_pmx_func_name(struct pinctrl_dev *pctrldev,
 228 +                                        unsigned func)
 229 +{
 230 +       struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev);
 231 +
 232 +       return p->func[func]->name;
 233 +}
 234 +
 235 +static int rt2880_pmx_group_get_groups(struct pinctrl_dev *pctrldev,
 236 +                               unsigned func,
 237 +                               const char * const **groups,
 238 +                               unsigned * const num_groups)
 239 +{
 240 +       struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev);
 241 +
 242 +       if (p->func[func]->group_count == 1)
 243 +               *groups = &p->group_names[p->func[func]->groups[0]];
 244 +       else
 245 +               *groups = p->group_names;
 246 +
 247 +       *num_groups = p->func[func]->group_count;
 248 +
 249 +       return 0;
 250 +}
 251 +
 252 +static int rt2880_pmx_group_enable(struct pinctrl_dev *pctrldev,
 253 +                               unsigned func,
 254 +                               unsigned group)
 255 +{
 256 +       struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev);
 257 +        u32 mode = 0;
 258 +       u32 reg = SYSC_REG_GPIO_MODE;
 259 +       int i;
 260 +       int shift;
 261 +
 262 +       /* dont allow double use */
 263 +       if (p->groups[group].enabled) {
 264 +               dev_err(p->dev, "%s is already enabled\n", p->groups[group].name);
 265 +               return -EBUSY;
 266 +       }
 267 +
 268 +       p->groups[group].enabled = 1;
 269 +       p->func[func]->enabled = 1;
 270 +
 271 +       shift = p->groups[group].shift;
 272 +       if (shift >= 32) {
 273 +               shift -= 32;
 274 +               reg = SYSC_REG_GPIO_MODE2;
 275 +       }
 276 +       mode = rt_sysc_r32(reg);
 277 +       mode &= ~(p->groups[group].mask << shift);
 278 +
 279 +       /* mark the pins as gpio */
 280 +       for (i = 0; i < p->groups[group].func[0].pin_count; i++)
 281 +               p->gpio[p->groups[group].func[0].pins[i]] = 1;
 282 +
 283 +       /* function 0 is gpio and needs special handling */
 284 +       if (func == 0) {
 285 +               mode |= p->groups[group].gpio << shift;
 286 +       } else {
 287 +               for (i = 0; i < p->func[func]->pin_count; i++)
 288 +                       p->gpio[p->func[func]->pins[i]] = 0;
 289 +               mode |= p->func[func]->value << shift;
 290 +       }
 291 +       rt_sysc_w32(mode, reg);
 292 +
 293 +       return 0;
 294 +}
 295 +
 296 +static int rt2880_pmx_group_gpio_request_enable(struct pinctrl_dev *pctrldev,
 297 +                               struct pinctrl_gpio_range *range,
 298 +                               unsigned pin)
 299 +{
 300 +       struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev);
 301 +
 302 +       if (!p->gpio[pin]) {
 303 +               dev_err(p->dev, "pin %d is not set to gpio mux\n", pin);
 304 +               return -EINVAL;
 305 +       }
 306 +
 307 +       return 0;
 308 +}
 309 +
 310 +static const struct pinmux_ops rt2880_pmx_group_ops = {
 311 +       .get_functions_count    = rt2880_pmx_func_count,
 312 +       .get_function_name      = rt2880_pmx_func_name,
 313 +       .get_function_groups    = rt2880_pmx_group_get_groups,
 314 +       .set_mux                = rt2880_pmx_group_enable,
 315 +       .gpio_request_enable    = rt2880_pmx_group_gpio_request_enable,
 316 +};
 317 +
 318 +static struct pinctrl_desc rt2880_pctrl_desc = {
 319 +       .owner          = THIS_MODULE,
 320 +       .name           = "rt2880-pinmux",
 321 +       .pctlops        = &rt2880_pctrl_ops,
 322 +       .pmxops         = &rt2880_pmx_group_ops,
 323 +};
 324 +
 325 +static struct rt2880_pmx_func gpio_func = {
 326 +       .name = "gpio",
 327 +};
 328 +
 329 +static int rt2880_pinmux_index(struct rt2880_priv *p)
 330 +{
 331 +       struct rt2880_pmx_func **f;
 332 +       struct rt2880_pmx_group *mux = p->groups;
 333 +       int i, j, c = 0;
 334 +
 335 +       /* count the mux functions */
 336 +       while (mux->name) {
 337 +               p->group_count++;
 338 +               mux++;
 339 +       }
 340 +
 341 +       /* allocate the group names array needed by the gpio function */
 342 +       p->group_names = devm_kzalloc(p->dev, sizeof(char *) * p->group_count, GFP_KERNEL);
 343 +       if (!p->group_names)
 344 +               return -1;
 345 +
 346 +       for (i = 0; i < p->group_count; i++) {
 347 +               p->group_names[i] = p->groups[i].name;
 348 +               p->func_count += p->groups[i].func_count;
 349 +       }
 350 +
 351 +       /* we have a dummy function[0] for gpio */
 352 +       p->func_count++;
 353 +
 354 +       /* allocate our function and group mapping index buffers */
 355 +       f = p->func = devm_kzalloc(p->dev, sizeof(struct rt2880_pmx_func) * p->func_count, GFP_KERNEL);
 356 +       gpio_func.groups = devm_kzalloc(p->dev, sizeof(int) * p->group_count, GFP_KERNEL);
 357 +       if (!f || !gpio_func.groups)
 358 +               return -1;
 359 +
 360 +       /* add a backpointer to the function so it knows its group */
 361 +       gpio_func.group_count = p->group_count;
 362 +       for (i = 0; i < gpio_func.group_count; i++)
 363 +               gpio_func.groups[i] = i;
 364 +
 365 +       f[c] = &gpio_func;
 366 +       c++;
 367 +
 368 +       /* add remaining functions */
 369 +       for (i = 0; i < p->group_count; i++) {
 370 +               for (j = 0; j < p->groups[i].func_count; j++) {
 371 +                       f[c] = &p->groups[i].func[j];
 372 +                       f[c]->groups = devm_kzalloc(p->dev, sizeof(int), GFP_KERNEL);
 373 +                       f[c]->groups[0] = i;
 374 +                       f[c]->group_count = 1;
 375 +                       c++;
 376 +               }
 377 +       }
 378 +       return 0;
 379 +}
 380 +
 381 +static int rt2880_pinmux_pins(struct rt2880_priv *p)
 382 +{
 383 +       int i, j;
 384 +
 385 +       /* loop over the functions and initialize the pins array. also work out the highest pin used */
 386 +       for (i = 0; i < p->func_count; i++) {
 387 +               int pin;
 388 +
 389 +               if (!p->func[i]->pin_count)
 390 +                       continue;
 391 +
 392 +               p->func[i]->pins = devm_kzalloc(p->dev, sizeof(int) * p->func[i]->pin_count, GFP_KERNEL);
 393 +               for (j = 0; j < p->func[i]->pin_count; j++)
 394 +                       p->func[i]->pins[j] = p->func[i]->pin_first + j;
 395 +
 396 +               pin = p->func[i]->pin_first + p->func[i]->pin_count;
 397 +               if (pin > p->max_pins)
 398 +                       p->max_pins = pin;
 399 +       }
 400 +
 401 +       /* the buffer that tells us which pins are gpio */
 402 +       p->gpio = devm_kzalloc(p->dev,sizeof(uint8_t) * p->max_pins,
 403 +               GFP_KERNEL);
 404 +       /* the pads needed to tell pinctrl about our pins */
 405 +       p->pads = devm_kzalloc(p->dev,
 406 +               sizeof(struct pinctrl_pin_desc) * p->max_pins,
 407 +               GFP_KERNEL);
 408 +       if (!p->pads || !p->gpio ) {
 409 +               dev_err(p->dev, "Failed to allocate gpio data\n");
 410 +               return -ENOMEM;
 411 +       }
 412 +
 413 +       memset(p->gpio, 1, sizeof(uint8_t) * p->max_pins);
 414 +       for (i = 0; i < p->func_count; i++) {
 415 +               if (!p->func[i]->pin_count)
 416 +                       continue;
 417 +
 418 +               for (j = 0; j < p->func[i]->pin_count; j++)
 419 +                       p->gpio[p->func[i]->pins[j]] = 0;
 420 +       }
 421 +
 422 +       /* pin 0 is always a gpio */
 423 +       p->gpio[0] = 1;
 424 +
 425 +       /* set the pads */
 426 +       for (i = 0; i < p->max_pins; i++) {
 427 +               /* strlen("ioXY") + 1 = 5 */
 428 +               char *name = devm_kzalloc(p->dev, 5, GFP_KERNEL);
 429 +
 430 +               if (!name) {
 431 +                       dev_err(p->dev, "Failed to allocate pad name\n");
 432 +                       return -ENOMEM;
 433 +               }
 434 +               snprintf(name, 5, "io%d", i);
 435 +               p->pads[i].number = i;
 436 +               p->pads[i].name = name;
 437 +       }
 438 +       p->desc->pins = p->pads;
 439 +       p->desc->npins = p->max_pins;
 440 +
 441 +       return 0;
 442 +}
 443 +
 444 +static int rt2880_pinmux_probe(struct platform_device *pdev)
 445 +{
 446 +       struct rt2880_priv *p;
 447 +       struct pinctrl_dev *dev;
 448 +       struct device_node *np;
 449 +
 450 +       if (!rt2880_pinmux_data)
 451 +               return -ENOSYS;
 452 +
 453 +       /* setup the private data */
 454 +       p = devm_kzalloc(&pdev->dev, sizeof(struct rt2880_priv), GFP_KERNEL);
 455 +       if (!p)
 456 +               return -ENOMEM;
 457 +
 458 +       p->dev = &pdev->dev;
 459 +       p->desc = &rt2880_pctrl_desc;
 460 +       p->groups = rt2880_pinmux_data;
 461 +       platform_set_drvdata(pdev, p);
 462 +
 463 +       /* init the device */
 464 +       if (rt2880_pinmux_index(p)) {
 465 +               dev_err(&pdev->dev, "failed to load index\n");
 466 +               return -EINVAL;
 467 +       }
 468 +       if (rt2880_pinmux_pins(p)) {
 469 +               dev_err(&pdev->dev, "failed to load pins\n");
 470 +               return -EINVAL;
 471 +       }
 472 +       dev = pinctrl_register(p->desc, &pdev->dev, p);
 473 +       if (IS_ERR(dev))
 474 +               return PTR_ERR(dev);
 475 +
 476 +       /* finalize by adding gpio ranges for enables gpio controllers */
 477 +       for_each_compatible_node(np, NULL, "ralink,rt2880-gpio") {
 478 +               const __be32 *ngpio, *gpiobase;
 479 +               struct pinctrl_gpio_range *range;
 480 +               char *name;
 481 +
 482 +               if (!of_device_is_available(np))
 483 +                       continue;
 484 +
 485 +               ngpio = of_get_property(np, "ralink,num-gpios", NULL);
 486 +               gpiobase = of_get_property(np, "ralink,gpio-base", NULL);
 487 +               if (!ngpio || !gpiobase) {
 488 +                       dev_err(&pdev->dev, "failed to load chip info\n");
 489 +                       return -EINVAL;
 490 +               }
 491 +
 492 +               range = devm_kzalloc(p->dev, sizeof(struct pinctrl_gpio_range) + 4, GFP_KERNEL);
 493 +               range->name = name = (char *) &range[1];
 494 +               sprintf(name, "pio");
 495 +               range->npins = __be32_to_cpu(*ngpio);
 496 +               range->base = __be32_to_cpu(*gpiobase);
 497 +               range->pin_base = range->base;
 498 +               pinctrl_add_gpio_range(dev, range);
 499 +       }
 500 +
 501 +       return 0;
 502 +}
 503 +
 504 +static const struct of_device_id rt2880_pinmux_match[] = {
 505 +       { .compatible = "ralink,rt2880-pinmux" },
 506 +       {},
 507 +};
 508 +MODULE_DEVICE_TABLE(of, rt2880_pinmux_match);
 509 +
 510 +static struct platform_driver rt2880_pinmux_driver = {
 511 +       .probe = rt2880_pinmux_probe,
 512 +       .driver = {
 513 +               .name = "rt2880-pinmux",
 514 +               .owner = THIS_MODULE,
 515 +               .of_match_table = rt2880_pinmux_match,
 516 +       },
 517 +};
 518 +
 519 +int __init rt2880_pinmux_init(void)
 520 +{
 521 +       return platform_driver_register(&rt2880_pinmux_driver);
 522 +}
 523 +
 524 +core_initcall_sync(rt2880_pinmux_init);