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1/*2 * Driver for the ST Microelectronics SPEAr pinmux3 *4 * Copyright (C) 2012 ST Microelectronics5 * Viresh Kumar <vireshk@kernel.org>6 *7 * Inspired from:8 * - U300 Pinctl drivers9 * - Tegra Pinctl drivers10 *11 * This file is licensed under the terms of the GNU General Public12 * License version 2. This program is licensed "as is" without any13 * warranty of any kind, whether express or implied.14 */15 16#include <linux/err.h>17#include <linux/mfd/syscon.h>18#include <linux/module.h>19#include <linux/of.h>20#include <linux/of_address.h>21#include <linux/platform_device.h>22#include <linux/seq_file.h>23#include <linux/slab.h>24 25#include <linux/pinctrl/machine.h>26#include <linux/pinctrl/pinctrl.h>27#include <linux/pinctrl/pinmux.h>28 29#include "pinctrl-spear.h"30 31#define DRIVER_NAME "spear-pinmux"32 33static void muxregs_endisable(struct spear_pmx *pmx,34 struct spear_muxreg *muxregs, u8 count, bool enable)35{36 struct spear_muxreg *muxreg;37 u32 val, temp, j;38 39 for (j = 0; j < count; j++) {40 muxreg = &muxregs[j];41 42 val = pmx_readl(pmx, muxreg->reg);43 val &= ~muxreg->mask;44 45 if (enable)46 temp = muxreg->val;47 else48 temp = ~muxreg->val;49 50 val |= muxreg->mask & temp;51 pmx_writel(pmx, val, muxreg->reg);52 }53}54 55static int set_mode(struct spear_pmx *pmx, int mode)56{57 struct spear_pmx_mode *pmx_mode = NULL;58 int i;59 u32 val;60 61 if (!pmx->machdata->pmx_modes || !pmx->machdata->npmx_modes)62 return -EINVAL;63 64 for (i = 0; i < pmx->machdata->npmx_modes; i++) {65 if (pmx->machdata->pmx_modes[i]->mode == (1 << mode)) {66 pmx_mode = pmx->machdata->pmx_modes[i];67 break;68 }69 }70 71 if (!pmx_mode)72 return -EINVAL;73 74 val = pmx_readl(pmx, pmx_mode->reg);75 val &= ~pmx_mode->mask;76 val |= pmx_mode->val;77 pmx_writel(pmx, val, pmx_mode->reg);78 79 pmx->machdata->mode = pmx_mode->mode;80 dev_info(pmx->dev, "Configured Mode: %s with id: %x\n\n",81 pmx_mode->name ? pmx_mode->name : "no_name",82 pmx_mode->reg);83 84 return 0;85}86 87void pmx_init_gpio_pingroup_addr(struct spear_gpio_pingroup *gpio_pingroup,88 unsigned count, u16 reg)89{90 int i, j;91 92 for (i = 0; i < count; i++)93 for (j = 0; j < gpio_pingroup[i].nmuxregs; j++)94 gpio_pingroup[i].muxregs[j].reg = reg;95}96 97void pmx_init_addr(struct spear_pinctrl_machdata *machdata, u16 reg)98{99 struct spear_pingroup *pgroup;100 struct spear_modemux *modemux;101 int i, j, group;102 103 for (group = 0; group < machdata->ngroups; group++) {104 pgroup = machdata->groups[group];105 106 for (i = 0; i < pgroup->nmodemuxs; i++) {107 modemux = &pgroup->modemuxs[i];108 109 for (j = 0; j < modemux->nmuxregs; j++)110 if (modemux->muxregs[j].reg == 0xFFFF)111 modemux->muxregs[j].reg = reg;112 }113 }114}115 116static int spear_pinctrl_get_groups_cnt(struct pinctrl_dev *pctldev)117{118 struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);119 120 return pmx->machdata->ngroups;121}122 123static const char *spear_pinctrl_get_group_name(struct pinctrl_dev *pctldev,124 unsigned group)125{126 struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);127 128 return pmx->machdata->groups[group]->name;129}130 131static int spear_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,132 unsigned group, const unsigned **pins, unsigned *num_pins)133{134 struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);135 136 *pins = pmx->machdata->groups[group]->pins;137 *num_pins = pmx->machdata->groups[group]->npins;138 139 return 0;140}141 142static void spear_pinctrl_pin_dbg_show(struct pinctrl_dev *pctldev,143 struct seq_file *s, unsigned offset)144{145 seq_printf(s, " " DRIVER_NAME);146}147 148static int spear_pinctrl_dt_node_to_map(struct pinctrl_dev *pctldev,149 struct device_node *np_config,150 struct pinctrl_map **map,151 unsigned *num_maps)152{153 struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);154 struct property *prop;155 const char *function, *group;156 int ret, index = 0, count = 0;157 158 /* calculate number of maps required */159 for_each_child_of_node_scoped(np_config, np) {160 ret = of_property_read_string(np, "st,function", &function);161 if (ret < 0)162 return ret;163 164 ret = of_property_count_strings(np, "st,pins");165 if (ret < 0)166 return ret;167 168 count += ret;169 }170 171 if (!count) {172 dev_err(pmx->dev, "No child nodes passed via DT\n");173 return -ENODEV;174 }175 176 *map = kcalloc(count, sizeof(**map), GFP_KERNEL);177 if (!*map)178 return -ENOMEM;179 180 for_each_child_of_node_scoped(np_config, np) {181 of_property_read_string(np, "st,function", &function);182 of_property_for_each_string(np, "st,pins", prop, group) {183 (*map)[index].type = PIN_MAP_TYPE_MUX_GROUP;184 (*map)[index].data.mux.group = group;185 (*map)[index].data.mux.function = function;186 index++;187 }188 }189 190 *num_maps = count;191 192 return 0;193}194 195static void spear_pinctrl_dt_free_map(struct pinctrl_dev *pctldev,196 struct pinctrl_map *map,197 unsigned num_maps)198{199 kfree(map);200}201 202static const struct pinctrl_ops spear_pinctrl_ops = {203 .get_groups_count = spear_pinctrl_get_groups_cnt,204 .get_group_name = spear_pinctrl_get_group_name,205 .get_group_pins = spear_pinctrl_get_group_pins,206 .pin_dbg_show = spear_pinctrl_pin_dbg_show,207 .dt_node_to_map = spear_pinctrl_dt_node_to_map,208 .dt_free_map = spear_pinctrl_dt_free_map,209};210 211static int spear_pinctrl_get_funcs_count(struct pinctrl_dev *pctldev)212{213 struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);214 215 return pmx->machdata->nfunctions;216}217 218static const char *spear_pinctrl_get_func_name(struct pinctrl_dev *pctldev,219 unsigned function)220{221 struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);222 223 return pmx->machdata->functions[function]->name;224}225 226static int spear_pinctrl_get_func_groups(struct pinctrl_dev *pctldev,227 unsigned function, const char *const **groups,228 unsigned * const ngroups)229{230 struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);231 232 *groups = pmx->machdata->functions[function]->groups;233 *ngroups = pmx->machdata->functions[function]->ngroups;234 235 return 0;236}237 238static int spear_pinctrl_endisable(struct pinctrl_dev *pctldev,239 unsigned function, unsigned group, bool enable)240{241 struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);242 const struct spear_pingroup *pgroup;243 const struct spear_modemux *modemux;244 int i;245 bool found = false;246 247 pgroup = pmx->machdata->groups[group];248 249 for (i = 0; i < pgroup->nmodemuxs; i++) {250 modemux = &pgroup->modemuxs[i];251 252 /* SoC have any modes */253 if (pmx->machdata->modes_supported) {254 if (!(pmx->machdata->mode & modemux->modes))255 continue;256 }257 258 found = true;259 muxregs_endisable(pmx, modemux->muxregs, modemux->nmuxregs,260 enable);261 }262 263 if (!found) {264 dev_err(pmx->dev, "pinmux group: %s not supported\n",265 pgroup->name);266 return -ENODEV;267 }268 269 return 0;270}271 272static int spear_pinctrl_set_mux(struct pinctrl_dev *pctldev, unsigned function,273 unsigned group)274{275 return spear_pinctrl_endisable(pctldev, function, group, true);276}277 278/* gpio with pinmux */279static struct spear_gpio_pingroup *get_gpio_pingroup(struct spear_pmx *pmx,280 unsigned pin)281{282 struct spear_gpio_pingroup *gpio_pingroup;283 int i, j;284 285 if (!pmx->machdata->gpio_pingroups)286 return NULL;287 288 for (i = 0; i < pmx->machdata->ngpio_pingroups; i++) {289 gpio_pingroup = &pmx->machdata->gpio_pingroups[i];290 291 for (j = 0; j < gpio_pingroup->npins; j++) {292 if (gpio_pingroup->pins[j] == pin)293 return gpio_pingroup;294 }295 }296 297 return NULL;298}299 300static int gpio_request_endisable(struct pinctrl_dev *pctldev,301 struct pinctrl_gpio_range *range, unsigned offset, bool enable)302{303 struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);304 struct spear_pinctrl_machdata *machdata = pmx->machdata;305 struct spear_gpio_pingroup *gpio_pingroup;306 307 /*308 * Some SoC have configuration options applicable to group of pins,309 * rather than a single pin.310 */311 gpio_pingroup = get_gpio_pingroup(pmx, offset);312 if (gpio_pingroup)313 muxregs_endisable(pmx, gpio_pingroup->muxregs,314 gpio_pingroup->nmuxregs, enable);315 316 /*317 * SoC may need some extra configurations, or configurations for single318 * pin319 */320 if (machdata->gpio_request_endisable)321 machdata->gpio_request_endisable(pmx, offset, enable);322 323 return 0;324}325 326static int gpio_request_enable(struct pinctrl_dev *pctldev,327 struct pinctrl_gpio_range *range, unsigned offset)328{329 return gpio_request_endisable(pctldev, range, offset, true);330}331 332static void gpio_disable_free(struct pinctrl_dev *pctldev,333 struct pinctrl_gpio_range *range, unsigned offset)334{335 gpio_request_endisable(pctldev, range, offset, false);336}337 338static const struct pinmux_ops spear_pinmux_ops = {339 .get_functions_count = spear_pinctrl_get_funcs_count,340 .get_function_name = spear_pinctrl_get_func_name,341 .get_function_groups = spear_pinctrl_get_func_groups,342 .set_mux = spear_pinctrl_set_mux,343 .gpio_request_enable = gpio_request_enable,344 .gpio_disable_free = gpio_disable_free,345};346 347static struct pinctrl_desc spear_pinctrl_desc = {348 .name = DRIVER_NAME,349 .pctlops = &spear_pinctrl_ops,350 .pmxops = &spear_pinmux_ops,351 .owner = THIS_MODULE,352};353 354int spear_pinctrl_probe(struct platform_device *pdev,355 struct spear_pinctrl_machdata *machdata)356{357 struct device_node *np = pdev->dev.of_node;358 struct spear_pmx *pmx;359 360 if (!machdata)361 return -ENODEV;362 363 pmx = devm_kzalloc(&pdev->dev, sizeof(*pmx), GFP_KERNEL);364 if (!pmx)365 return -ENOMEM;366 367 pmx->regmap = device_node_to_regmap(np);368 if (IS_ERR(pmx->regmap)) {369 dev_err(&pdev->dev, "Init regmap failed (%pe).\n",370 pmx->regmap);371 return PTR_ERR(pmx->regmap);372 }373 374 pmx->dev = &pdev->dev;375 pmx->machdata = machdata;376 377 /* configure mode, if supported by SoC */378 if (machdata->modes_supported) {379 int mode = 0;380 381 if (of_property_read_u32(np, "st,pinmux-mode", &mode)) {382 dev_err(&pdev->dev, "OF: pinmux mode not passed\n");383 return -EINVAL;384 }385 386 if (set_mode(pmx, mode)) {387 dev_err(&pdev->dev, "OF: Couldn't configure mode: %x\n",388 mode);389 return -EINVAL;390 }391 }392 393 platform_set_drvdata(pdev, pmx);394 395 spear_pinctrl_desc.pins = machdata->pins;396 spear_pinctrl_desc.npins = machdata->npins;397 398 pmx->pctl = devm_pinctrl_register(&pdev->dev, &spear_pinctrl_desc, pmx);399 if (IS_ERR(pmx->pctl)) {400 dev_err(&pdev->dev, "Couldn't register pinctrl driver\n");401 return PTR_ERR(pmx->pctl);402 }403 404 return 0;405}406