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1// SPDX-License-Identifier: GPL-2.02/*3 * Marvell Berlin SoC pinctrl core driver4 *5 * Copyright (C) 2014 Marvell Technology Group Ltd.6 *7 * Antoine Ténart <antoine.tenart@free-electrons.com>8 */9 10#include <linux/io.h>11#include <linux/mfd/syscon.h>12#include <linux/module.h>13#include <linux/of.h>14#include <linux/of_address.h>15#include <linux/of_device.h>16#include <linux/pinctrl/pinctrl.h>17#include <linux/pinctrl/pinmux.h>18#include <linux/platform_device.h>19#include <linux/regmap.h>20#include <linux/slab.h>21 22#include "../core.h"23#include "../pinctrl-utils.h"24#include "berlin.h"25 26struct berlin_pinctrl {27 struct regmap *regmap;28 struct device *dev;29 const struct berlin_pinctrl_desc *desc;30 struct pinfunction *functions;31 unsigned nfunctions;32 struct pinctrl_dev *pctrl_dev;33};34 35static int berlin_pinctrl_get_group_count(struct pinctrl_dev *pctrl_dev)36{37 struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);38 39 return pctrl->desc->ngroups;40}41 42static const char *berlin_pinctrl_get_group_name(struct pinctrl_dev *pctrl_dev,43 unsigned group)44{45 struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);46 47 return pctrl->desc->groups[group].name;48}49 50static int berlin_pinctrl_dt_node_to_map(struct pinctrl_dev *pctrl_dev,51 struct device_node *node,52 struct pinctrl_map **map,53 unsigned *num_maps)54{55 struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);56 struct property *prop;57 const char *function_name, *group_name;58 unsigned reserved_maps = 0;59 int ret, ngroups;60 61 *map = NULL;62 *num_maps = 0;63 64 ret = of_property_read_string(node, "function", &function_name);65 if (ret) {66 dev_err(pctrl->dev,67 "missing function property in node %pOFn\n", node);68 return -EINVAL;69 }70 71 ngroups = of_property_count_strings(node, "groups");72 if (ngroups < 0) {73 dev_err(pctrl->dev,74 "missing groups property in node %pOFn\n", node);75 return -EINVAL;76 }77 78 ret = pinctrl_utils_reserve_map(pctrl_dev, map, &reserved_maps,79 num_maps, ngroups);80 if (ret) {81 dev_err(pctrl->dev, "can't reserve map: %d\n", ret);82 return ret;83 }84 85 of_property_for_each_string(node, "groups", prop, group_name) {86 ret = pinctrl_utils_add_map_mux(pctrl_dev, map, &reserved_maps,87 num_maps, group_name,88 function_name);89 if (ret) {90 dev_err(pctrl->dev, "can't add map: %d\n", ret);91 return ret;92 }93 }94 95 return 0;96}97 98static const struct pinctrl_ops berlin_pinctrl_ops = {99 .get_groups_count = berlin_pinctrl_get_group_count,100 .get_group_name = berlin_pinctrl_get_group_name,101 .dt_node_to_map = berlin_pinctrl_dt_node_to_map,102 .dt_free_map = pinctrl_utils_free_map,103};104 105static int berlin_pinmux_get_functions_count(struct pinctrl_dev *pctrl_dev)106{107 struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);108 109 return pctrl->nfunctions;110}111 112static const char *berlin_pinmux_get_function_name(struct pinctrl_dev *pctrl_dev,113 unsigned function)114{115 struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);116 117 return pctrl->functions[function].name;118}119 120static int berlin_pinmux_get_function_groups(struct pinctrl_dev *pctrl_dev,121 unsigned function,122 const char * const **groups,123 unsigned * const ngroups)124{125 struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);126 127 *groups = pctrl->functions[function].groups;128 *ngroups = pctrl->functions[function].ngroups;129 130 return 0;131}132 133static struct berlin_desc_function *134berlin_pinctrl_find_function_by_name(struct berlin_pinctrl *pctrl,135 const struct berlin_desc_group *group,136 const char *fname)137{138 struct berlin_desc_function *function = group->functions;139 140 while (function->name) {141 if (!strcmp(function->name, fname))142 return function;143 144 function++;145 }146 147 return NULL;148}149 150static int berlin_pinmux_set(struct pinctrl_dev *pctrl_dev,151 unsigned function,152 unsigned group)153{154 struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);155 const struct berlin_desc_group *group_desc = pctrl->desc->groups + group;156 struct pinfunction *func = pctrl->functions + function;157 struct berlin_desc_function *function_desc =158 berlin_pinctrl_find_function_by_name(pctrl, group_desc,159 func->name);160 u32 mask, val;161 162 if (!function_desc)163 return -EINVAL;164 165 mask = GENMASK(group_desc->lsb + group_desc->bit_width - 1,166 group_desc->lsb);167 val = function_desc->muxval << group_desc->lsb;168 regmap_update_bits(pctrl->regmap, group_desc->offset, mask, val);169 170 return 0;171}172 173static const struct pinmux_ops berlin_pinmux_ops = {174 .get_functions_count = &berlin_pinmux_get_functions_count,175 .get_function_name = &berlin_pinmux_get_function_name,176 .get_function_groups = &berlin_pinmux_get_function_groups,177 .set_mux = &berlin_pinmux_set,178};179 180static int berlin_pinctrl_add_function(struct berlin_pinctrl *pctrl,181 const char *name)182{183 struct pinfunction *function = pctrl->functions;184 185 while (function->name) {186 if (!strcmp(function->name, name)) {187 function->ngroups++;188 return -EEXIST;189 }190 function++;191 }192 193 function->name = name;194 function->ngroups = 1;195 196 pctrl->nfunctions++;197 198 return 0;199}200 201static int berlin_pinctrl_build_state(struct platform_device *pdev)202{203 struct berlin_pinctrl *pctrl = platform_get_drvdata(pdev);204 const struct berlin_desc_group *desc_group;205 const struct berlin_desc_function *desc_function;206 int i, max_functions = 0;207 208 pctrl->nfunctions = 0;209 210 for (i = 0; i < pctrl->desc->ngroups; i++) {211 desc_group = pctrl->desc->groups + i;212 /* compute the maximum number of functions a group can have */213 max_functions += 1 << (desc_group->bit_width + 1);214 }215 216 /* we will reallocate later */217 pctrl->functions = kcalloc(max_functions, sizeof(*pctrl->functions), GFP_KERNEL);218 if (!pctrl->functions)219 return -ENOMEM;220 221 /* register all functions */222 for (i = 0; i < pctrl->desc->ngroups; i++) {223 desc_group = pctrl->desc->groups + i;224 desc_function = desc_group->functions;225 226 while (desc_function->name) {227 berlin_pinctrl_add_function(pctrl, desc_function->name);228 desc_function++;229 }230 }231 232 pctrl->functions = krealloc(pctrl->functions,233 pctrl->nfunctions * sizeof(*pctrl->functions),234 GFP_KERNEL);235 if (!pctrl->functions)236 return -ENOMEM;237 238 /* map functions to theirs groups */239 for (i = 0; i < pctrl->desc->ngroups; i++) {240 desc_group = pctrl->desc->groups + i;241 desc_function = desc_group->functions;242 243 while (desc_function->name) {244 struct pinfunction *function = pctrl->functions;245 const char **groups;246 bool found = false;247 248 while (function->name) {249 if (!strcmp(desc_function->name, function->name)) {250 found = true;251 break;252 }253 function++;254 }255 256 if (!found) {257 kfree(pctrl->functions);258 return -EINVAL;259 }260 261 if (!function->groups) {262 function->groups =263 devm_kcalloc(&pdev->dev,264 function->ngroups,265 sizeof(*function->groups),266 GFP_KERNEL);267 if (!function->groups) {268 kfree(pctrl->functions);269 return -ENOMEM;270 }271 }272 273 groups = (const char **)function->groups;274 while (*groups)275 groups++;276 277 *groups = desc_group->name;278 279 desc_function++;280 }281 }282 283 return 0;284}285 286static struct pinctrl_desc berlin_pctrl_desc = {287 .name = "berlin-pinctrl",288 .pctlops = &berlin_pinctrl_ops,289 .pmxops = &berlin_pinmux_ops,290 .owner = THIS_MODULE,291};292 293int berlin_pinctrl_probe_regmap(struct platform_device *pdev,294 const struct berlin_pinctrl_desc *desc,295 struct regmap *regmap)296{297 struct device *dev = &pdev->dev;298 struct berlin_pinctrl *pctrl;299 int ret;300 301 pctrl = devm_kzalloc(dev, sizeof(*pctrl), GFP_KERNEL);302 if (!pctrl)303 return -ENOMEM;304 305 platform_set_drvdata(pdev, pctrl);306 307 pctrl->regmap = regmap;308 pctrl->dev = &pdev->dev;309 pctrl->desc = desc;310 311 ret = berlin_pinctrl_build_state(pdev);312 if (ret) {313 dev_err(dev, "cannot build driver state: %d\n", ret);314 return ret;315 }316 317 pctrl->pctrl_dev = devm_pinctrl_register(dev, &berlin_pctrl_desc,318 pctrl);319 if (IS_ERR(pctrl->pctrl_dev)) {320 dev_err(dev, "failed to register pinctrl driver\n");321 return PTR_ERR(pctrl->pctrl_dev);322 }323 324 return 0;325}326 327int berlin_pinctrl_probe(struct platform_device *pdev,328 const struct berlin_pinctrl_desc *desc)329{330 struct device *dev = &pdev->dev;331 struct device_node *parent_np = of_get_parent(dev->of_node);332 struct regmap *regmap = syscon_node_to_regmap(parent_np);333 334 of_node_put(parent_np);335 if (IS_ERR(regmap))336 return PTR_ERR(regmap);337 338 return berlin_pinctrl_probe_regmap(pdev, desc, regmap);339}340