diff options
Diffstat (limited to 'drivers/pinctrl/berlin/berlin.c')
-rw-r--r-- | drivers/pinctrl/berlin/berlin.c | 342 |
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..1e427ea4d --- /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 %pOFn\n", node); + return -EINVAL; + } + + ngroups = of_property_count_strings(node, "groups"); + if (ngroups < 0) { + dev_err(pctrl->dev, + "missing groups property in node %pOFn\n", node); + 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 maximum 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); + if (!pctrl->functions) + return -ENOMEM; + + /* 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); +} |