--- /dev/null
+/*
+ * Marvell Berlin SoC pinctrl core driver
+ *
+ * Copyright (C) 2014 Marvell Technology Group Ltd.
+ *
+ * Antoine Ténart <antoine.tenart@free-electrons.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+#include "../core.h"
+#include "../pinctrl-utils.h"
+#include "berlin.h"
+
+struct berlin_pinctrl {
+ struct regmap *regmap;
+ struct device *dev;
+ const struct berlin_pinctrl_desc *desc;
+ struct berlin_pinctrl_function *functions;
+ unsigned nfunctions;
+ struct pinctrl_dev *pctrl_dev;
+};
+
+static int berlin_pinctrl_get_group_count(struct pinctrl_dev *pctrl_dev)
+{
+ struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+ return pctrl->desc->ngroups;
+}
+
+static const char *berlin_pinctrl_get_group_name(struct pinctrl_dev *pctrl_dev,
+ unsigned group)
+{
+ struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+ return pctrl->desc->groups[group].name;
+}
+
+static int berlin_pinctrl_dt_node_to_map(struct pinctrl_dev *pctrl_dev,
+ struct device_node *node,
+ struct pinctrl_map **map,
+ unsigned *num_maps)
+{
+ struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+ struct property *prop;
+ const char *function_name, *group_name;
+ unsigned reserved_maps = 0;
+ int ret, ngroups;
+
+ *map = NULL;
+ *num_maps = 0;
+
+ ret = of_property_read_string(node, "function", &function_name);
+ if (ret) {
+ dev_err(pctrl->dev,
+ "missing function property in node %s\n",
+ node->name);
+ return -EINVAL;
+ }
+
+ ngroups = of_property_count_strings(node, "groups");
+ if (ngroups < 0) {
+ dev_err(pctrl->dev,
+ "missing groups property in node %s\n",
+ node->name);
+ return -EINVAL;
+ }
+
+ ret = pinctrl_utils_reserve_map(pctrl_dev, map, &reserved_maps,
+ num_maps, ngroups);
+ if (ret) {
+ dev_err(pctrl->dev, "can't reserve map: %d\n", ret);
+ return ret;
+ }
+
+ of_property_for_each_string(node, "groups", prop, group_name) {
+ ret = pinctrl_utils_add_map_mux(pctrl_dev, map, &reserved_maps,
+ num_maps, group_name,
+ function_name);
+ if (ret) {
+ dev_err(pctrl->dev, "can't add map: %d\n", ret);
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static void berlin_pinctrl_dt_free_map(struct pinctrl_dev *pctrl_dev,
+ struct pinctrl_map *map,
+ unsigned nmaps)
+{
+ int i;
+
+ for (i = 0; i < nmaps; i++) {
+ if (map[i].type == PIN_MAP_TYPE_MUX_GROUP) {
+ kfree(map[i].data.mux.group);
+
+ /* a function can be applied to multiple groups */
+ if (i == 0)
+ kfree(map[i].data.mux.function);
+ }
+ }
+
+ kfree(map);
+}
+
+static const struct pinctrl_ops berlin_pinctrl_ops = {
+ .get_groups_count = &berlin_pinctrl_get_group_count,
+ .get_group_name = &berlin_pinctrl_get_group_name,
+ .dt_node_to_map = &berlin_pinctrl_dt_node_to_map,
+ .dt_free_map = &berlin_pinctrl_dt_free_map,
+};
+
+static int berlin_pinmux_get_functions_count(struct pinctrl_dev *pctrl_dev)
+{
+ struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+ return pctrl->nfunctions;
+}
+
+static const char *berlin_pinmux_get_function_name(struct pinctrl_dev *pctrl_dev,
+ unsigned function)
+{
+ struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+ return pctrl->functions[function].name;
+}
+
+static int berlin_pinmux_get_function_groups(struct pinctrl_dev *pctrl_dev,
+ unsigned function,
+ const char * const **groups,
+ unsigned * const num_groups)
+{
+ struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+ *groups = pctrl->functions[function].groups;
+ *num_groups = pctrl->functions[function].ngroups;
+
+ return 0;
+}
+
+static struct berlin_desc_function *
+berlin_pinctrl_find_function_by_name(struct berlin_pinctrl *pctrl,
+ const struct berlin_desc_group *group,
+ const char *fname)
+{
+ struct berlin_desc_function *function = group->functions;
+
+ while (function->name) {
+ if (!strcmp(function->name, fname))
+ return function;
+
+ function++;
+ }
+
+ return NULL;
+}
+
+static int berlin_pinmux_enable(struct pinctrl_dev *pctrl_dev,
+ unsigned function,
+ unsigned group)
+{
+ struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+ const struct berlin_desc_group *group_desc = pctrl->desc->groups + group;
+ struct berlin_pinctrl_function *func = pctrl->functions + function;
+ struct berlin_desc_function *function_desc =
+ berlin_pinctrl_find_function_by_name(pctrl, group_desc,
+ func->name);
+ u32 mask, val;
+
+ if (!function_desc)
+ return -EINVAL;
+
+ mask = GENMASK(group_desc->lsb + group_desc->bit_width - 1,
+ group_desc->lsb);
+ val = function_desc->muxval << group_desc->lsb;
+ regmap_update_bits(pctrl->regmap, group_desc->offset, mask, val);
+
+ return 0;
+}
+
+static const struct pinmux_ops berlin_pinmux_ops = {
+ .get_functions_count = &berlin_pinmux_get_functions_count,
+ .get_function_name = &berlin_pinmux_get_function_name,
+ .get_function_groups = &berlin_pinmux_get_function_groups,
+ .enable = &berlin_pinmux_enable,
+};
+
+static int berlin_pinctrl_add_function(struct berlin_pinctrl *pctrl,
+ const char *name)
+{
+ struct berlin_pinctrl_function *function = pctrl->functions;
+
+ while (function->name) {
+ if (!strcmp(function->name, name)) {
+ function->ngroups++;
+ return -EEXIST;
+ }
+ function++;
+ }
+
+ function->name = name;
+ function->ngroups = 1;
+
+ pctrl->nfunctions++;
+
+ return 0;
+}
+
+static int berlin_pinctrl_build_state(struct platform_device *pdev)
+{
+ struct berlin_pinctrl *pctrl = platform_get_drvdata(pdev);
+ struct berlin_desc_group const *desc_group;
+ struct berlin_desc_function const *desc_function;
+ int i, max_functions = 0;
+
+ pctrl->nfunctions = 0;
+
+ for (i = 0; i < pctrl->desc->ngroups; i++) {
+ desc_group = pctrl->desc->groups + i;
+ /* compute the maxiumum number of functions a group can have */
+ max_functions += 1 << (desc_group->bit_width + 1);
+ }
+
+ /* we will reallocate later */
+ pctrl->functions = devm_kzalloc(&pdev->dev,
+ max_functions * sizeof(*pctrl->functions),
+ GFP_KERNEL);
+ if (!pctrl->functions)
+ return -ENOMEM;
+
+ /* register all functions */
+ for (i = 0; i < pctrl->desc->ngroups; i++) {
+ desc_group = pctrl->desc->groups + i;
+ desc_function = desc_group->functions;
+
+ while (desc_function->name) {
+ berlin_pinctrl_add_function(pctrl, desc_function->name);
+ desc_function++;
+ }
+ }
+
+ pctrl->functions = krealloc(pctrl->functions,
+ pctrl->nfunctions * sizeof(*pctrl->functions),
+ GFP_KERNEL);
+
+ /* map functions to theirs groups */
+ for (i = 0; i < pctrl->desc->ngroups; i++) {
+ desc_group = pctrl->desc->groups + i;
+ desc_function = desc_group->functions;
+
+ while (desc_function->name) {
+ struct berlin_pinctrl_function
+ *function = pctrl->functions;
+ const char **groups;
+ bool found = false;
+
+ while (function->name) {
+ if (!strcmp(desc_function->name, function->name)) {
+ found = true;
+ break;
+ }
+ function++;
+ }
+
+ if (!found)
+ return -EINVAL;
+
+ if (!function->groups) {
+ function->groups =
+ devm_kzalloc(&pdev->dev,
+ function->ngroups * sizeof(char *),
+ GFP_KERNEL);
+
+ if (!function->groups)
+ return -ENOMEM;
+ }
+
+ groups = function->groups;
+ while (*groups)
+ groups++;
+
+ *groups = desc_group->name;
+
+ desc_function++;
+ }
+ }
+
+ return 0;
+}
+
+static struct pinctrl_desc berlin_pctrl_desc = {
+ .name = "berlin-pinctrl",
+ .pctlops = &berlin_pinctrl_ops,
+ .pmxops = &berlin_pinmux_ops,
+ .owner = THIS_MODULE,
+};
+
+int berlin_pinctrl_probe(struct platform_device *pdev,
+ const struct berlin_pinctrl_desc *desc)
+{
+ struct device *dev = &pdev->dev;
+ struct berlin_pinctrl *pctrl;
+ struct regmap *regmap;
+ int ret;
+
+ regmap = dev_get_regmap(&pdev->dev, NULL);
+ if (!regmap)
+ return PTR_ERR(regmap);
+
+ pctrl = devm_kzalloc(dev, sizeof(*pctrl), GFP_KERNEL);
+ if (!pctrl)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, pctrl);
+
+ pctrl->regmap = regmap;
+ pctrl->dev = &pdev->dev;
+ pctrl->desc = desc;
+
+ ret = berlin_pinctrl_build_state(pdev);
+ if (ret) {
+ dev_err(dev, "cannot build driver state: %d\n", ret);
+ return ret;
+ }
+
+ pctrl->pctrl_dev = pinctrl_register(&berlin_pctrl_desc, dev, pctrl);
+ if (!pctrl->pctrl_dev) {
+ dev_err(dev, "failed to register pinctrl driver\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
projects / cascardo / linux.git / commitdiff