1 // SPDX-License-Identifier: GPL-2.0
3 * Marvell Berlin SoC pinctrl core driver
5 * Copyright (C) 2014 Marvell Technology Group Ltd.
7 * Antoine Ténart <antoine.tenart@free-electrons.com>
11 #include <linux/mfd/syscon.h>
12 #include <linux/module.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>
23 #include "../pinctrl-utils.h"
26 struct berlin_pinctrl {
27 struct regmap *regmap;
29 const struct berlin_pinctrl_desc *desc;
30 struct berlin_pinctrl_function *functions;
32 struct pinctrl_dev *pctrl_dev;
35 static int berlin_pinctrl_get_group_count(struct pinctrl_dev *pctrl_dev)
37 struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);
39 return pctrl->desc->ngroups;
42 static const char *berlin_pinctrl_get_group_name(struct pinctrl_dev *pctrl_dev,
45 struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);
47 return pctrl->desc->groups[group].name;
50 static int berlin_pinctrl_dt_node_to_map(struct pinctrl_dev *pctrl_dev,
51 struct device_node *node,
52 struct pinctrl_map **map,
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;
64 ret = of_property_read_string(node, "function", &function_name);
67 "missing function property in node %s\n",
72 ngroups = of_property_count_strings(node, "groups");
75 "missing groups property in node %s\n",
80 ret = pinctrl_utils_reserve_map(pctrl_dev, map, &reserved_maps,
83 dev_err(pctrl->dev, "can't reserve map: %d\n", ret);
87 of_property_for_each_string(node, "groups", prop, group_name) {
88 ret = pinctrl_utils_add_map_mux(pctrl_dev, map, &reserved_maps,
92 dev_err(pctrl->dev, "can't add map: %d\n", ret);
100 static const struct pinctrl_ops berlin_pinctrl_ops = {
101 .get_groups_count = &berlin_pinctrl_get_group_count,
102 .get_group_name = &berlin_pinctrl_get_group_name,
103 .dt_node_to_map = &berlin_pinctrl_dt_node_to_map,
104 .dt_free_map = &pinctrl_utils_free_map,
107 static int berlin_pinmux_get_functions_count(struct pinctrl_dev *pctrl_dev)
109 struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);
111 return pctrl->nfunctions;
114 static const char *berlin_pinmux_get_function_name(struct pinctrl_dev *pctrl_dev,
117 struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);
119 return pctrl->functions[function].name;
122 static int berlin_pinmux_get_function_groups(struct pinctrl_dev *pctrl_dev,
124 const char * const **groups,
125 unsigned * const num_groups)
127 struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);
129 *groups = pctrl->functions[function].groups;
130 *num_groups = pctrl->functions[function].ngroups;
135 static struct berlin_desc_function *
136 berlin_pinctrl_find_function_by_name(struct berlin_pinctrl *pctrl,
137 const struct berlin_desc_group *group,
140 struct berlin_desc_function *function = group->functions;
142 while (function->name) {
143 if (!strcmp(function->name, fname))
152 static int berlin_pinmux_set(struct pinctrl_dev *pctrl_dev,
156 struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);
157 const struct berlin_desc_group *group_desc = pctrl->desc->groups + group;
158 struct berlin_pinctrl_function *func = pctrl->functions + function;
159 struct berlin_desc_function *function_desc =
160 berlin_pinctrl_find_function_by_name(pctrl, group_desc,
167 mask = GENMASK(group_desc->lsb + group_desc->bit_width - 1,
169 val = function_desc->muxval << group_desc->lsb;
170 regmap_update_bits(pctrl->regmap, group_desc->offset, mask, val);
175 static const struct pinmux_ops berlin_pinmux_ops = {
176 .get_functions_count = &berlin_pinmux_get_functions_count,
177 .get_function_name = &berlin_pinmux_get_function_name,
178 .get_function_groups = &berlin_pinmux_get_function_groups,
179 .set_mux = &berlin_pinmux_set,
182 static int berlin_pinctrl_add_function(struct berlin_pinctrl *pctrl,
185 struct berlin_pinctrl_function *function = pctrl->functions;
187 while (function->name) {
188 if (!strcmp(function->name, name)) {
195 function->name = name;
196 function->ngroups = 1;
203 static int berlin_pinctrl_build_state(struct platform_device *pdev)
205 struct berlin_pinctrl *pctrl = platform_get_drvdata(pdev);
206 const struct berlin_desc_group *desc_group;
207 const struct berlin_desc_function *desc_function;
208 int i, max_functions = 0;
210 pctrl->nfunctions = 0;
212 for (i = 0; i < pctrl->desc->ngroups; i++) {
213 desc_group = pctrl->desc->groups + i;
214 /* compute the maxiumum number of functions a group can have */
215 max_functions += 1 << (desc_group->bit_width + 1);
218 /* we will reallocate later */
219 pctrl->functions = kcalloc(max_functions,
220 sizeof(*pctrl->functions), GFP_KERNEL);
221 if (!pctrl->functions)
224 /* register all functions */
225 for (i = 0; i < pctrl->desc->ngroups; i++) {
226 desc_group = pctrl->desc->groups + i;
227 desc_function = desc_group->functions;
229 while (desc_function->name) {
230 berlin_pinctrl_add_function(pctrl, desc_function->name);
235 pctrl->functions = krealloc(pctrl->functions,
236 pctrl->nfunctions * sizeof(*pctrl->functions),
239 /* map functions to theirs groups */
240 for (i = 0; i < pctrl->desc->ngroups; i++) {
241 desc_group = pctrl->desc->groups + i;
242 desc_function = desc_group->functions;
244 while (desc_function->name) {
245 struct berlin_pinctrl_function
246 *function = pctrl->functions;
250 while (function->name) {
251 if (!strcmp(desc_function->name, function->name)) {
259 kfree(pctrl->functions);
263 if (!function->groups) {
265 devm_kcalloc(&pdev->dev,
270 if (!function->groups) {
271 kfree(pctrl->functions);
276 groups = function->groups;
280 *groups = desc_group->name;
289 static struct pinctrl_desc berlin_pctrl_desc = {
290 .name = "berlin-pinctrl",
291 .pctlops = &berlin_pinctrl_ops,
292 .pmxops = &berlin_pinmux_ops,
293 .owner = THIS_MODULE,
296 int berlin_pinctrl_probe_regmap(struct platform_device *pdev,
297 const struct berlin_pinctrl_desc *desc,
298 struct regmap *regmap)
300 struct device *dev = &pdev->dev;
301 struct berlin_pinctrl *pctrl;
304 pctrl = devm_kzalloc(dev, sizeof(*pctrl), GFP_KERNEL);
308 platform_set_drvdata(pdev, pctrl);
310 pctrl->regmap = regmap;
311 pctrl->dev = &pdev->dev;
314 ret = berlin_pinctrl_build_state(pdev);
316 dev_err(dev, "cannot build driver state: %d\n", ret);
320 pctrl->pctrl_dev = devm_pinctrl_register(dev, &berlin_pctrl_desc,
322 if (IS_ERR(pctrl->pctrl_dev)) {
323 dev_err(dev, "failed to register pinctrl driver\n");
324 return PTR_ERR(pctrl->pctrl_dev);
330 int berlin_pinctrl_probe(struct platform_device *pdev,
331 const struct berlin_pinctrl_desc *desc)
333 struct device *dev = &pdev->dev;
334 struct device_node *parent_np = of_get_parent(dev->of_node);
335 struct regmap *regmap = syscon_node_to_regmap(parent_np);
337 of_node_put(parent_np);
339 return PTR_ERR(regmap);
341 return berlin_pinctrl_probe_regmap(pdev, desc, regmap);