1 files changed, 342 insertions, 0 deletions

diff --git a/drivers/pinctrl/berlin/berlin.c b/drivers/pinctrl/berlin/berlin.c
new file mode 100644
index 000000000..b5903fffb
--- /dev/null
+++ b/drivers/pinctrl/berlin/berlin.c
@@ -0,0 +1,342 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Marvell Berlin SoC pinctrl core driver
+ *
+ * Copyright (C) 2014 Marvell Technology Group Ltd.
+ *
+ * Antoine Ténart <antoine.tenart@free-electrons.com>
+ */
+
+#include <linux/io.h>
+#include <linux/mfd/syscon.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 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		= &pinctrl_utils_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_set(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,
+	.set_mux		= &berlin_pinmux_set,
+};
+
+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);
+	const struct berlin_desc_group *desc_group;
+	const struct berlin_desc_function *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 = kcalloc(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) {
+				kfree(pctrl->functions);
+				return -EINVAL;
+			}
+
+			if (!function->groups) {
+				function->groups =
+					devm_kcalloc(&pdev->dev,
+						     function->ngroups,
+						     sizeof(char *),
+						     GFP_KERNEL);
+
+				if (!function->groups) {
+					kfree(pctrl->functions);
+					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_regmap(struct platform_device *pdev,
+				const struct berlin_pinctrl_desc *desc,
+				struct regmap *regmap)
+{
+	struct device *dev = &pdev->dev;
+	struct berlin_pinctrl *pctrl;
+	int ret;
+
+	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 = devm_pinctrl_register(dev, &berlin_pctrl_desc,
+						 pctrl);
+	if (IS_ERR(pctrl->pctrl_dev)) {
+		dev_err(dev, "failed to register pinctrl driver\n");
+		return PTR_ERR(pctrl->pctrl_dev);
+	}
+
+	return 0;
+}
+
+int berlin_pinctrl_probe(struct platform_device *pdev,
+			 const struct berlin_pinctrl_desc *desc)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *parent_np = of_get_parent(dev->of_node);
+	struct regmap *regmap = syscon_node_to_regmap(parent_np);
+
+	of_node_put(parent_np);
+	if (IS_ERR(regmap))
+		return PTR_ERR(regmap);
+
+	return berlin_pinctrl_probe_regmap(pdev, desc, regmap);
+}