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