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340 lines
8.2 KiB
340 lines
8.2 KiB
// SPDX-License-Identifier: GPL-2.0 |
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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 <[email protected]> |
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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 %pOFn\n", node); |
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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 %pOFn\n", node); |
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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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const struct berlin_desc_group *desc_group; |
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const struct berlin_desc_function *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 = kcalloc(max_functions, |
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sizeof(*pctrl->functions), 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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kfree(pctrl->functions); |
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return -EINVAL; |
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} |
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if (!function->groups) { |
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function->groups = |
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devm_kcalloc(&pdev->dev, |
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function->ngroups, |
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sizeof(char *), |
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GFP_KERNEL); |
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if (!function->groups) { |
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kfree(pctrl->functions); |
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return -ENOMEM; |
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} |
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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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