// SPDX-License-Identifier: GPL-2.0-only /* * Core driver for the generic pin config portions of the pin control subsystem * * Copyright (C) 2011 ST-Ericsson SA * Written on behalf of Linaro for ST-Ericsson * * Author: Linus Walleij <linus.walleij@linaro.org> */ #define pr_fmt(fmt) "generic pinconfig core: " fmt #include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> #include <linux/device.h> #include <linux/slab.h> #include <linux/debugfs.h> #include <linux/seq_file.h> #include <linux/pinctrl/pinctrl.h> #include <linux/pinctrl/pinconf.h> #include <linux/pinctrl/pinconf-generic.h> #include <linux/of.h> #include "core.h" #include "pinconf.h" #include "pinctrl-utils.h" #ifdef CONFIG_DEBUG_FS static const struct pin_config_item conf_items[] = { PCONFDUMP(PIN_CONFIG_BIAS_BUS_HOLD, "input bias bus hold", NULL, false), PCONFDUMP(PIN_CONFIG_BIAS_DISABLE, "input bias disabled", NULL, false), PCONFDUMP(PIN_CONFIG_BIAS_HIGH_IMPEDANCE, "input bias high impedance", NULL, false), PCONFDUMP(PIN_CONFIG_BIAS_PULL_DOWN, "input bias pull down", NULL, false), PCONFDUMP(PIN_CONFIG_BIAS_PULL_PIN_DEFAULT, "input bias pull to pin specific state", NULL, false), PCONFDUMP(PIN_CONFIG_BIAS_PULL_UP, "input bias pull up", NULL, false), PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_DRAIN, "output drive open drain", NULL, false), PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_SOURCE, "output drive open source", NULL, false), PCONFDUMP(PIN_CONFIG_DRIVE_PUSH_PULL, "output drive push pull", NULL, false), PCONFDUMP(PIN_CONFIG_DRIVE_STRENGTH, "output drive strength", "mA", true), PCONFDUMP(PIN_CONFIG_DRIVE_STRENGTH_UA, "output drive strength", "uA", true), PCONFDUMP(PIN_CONFIG_INPUT_DEBOUNCE, "input debounce", "usec", true), PCONFDUMP(PIN_CONFIG_INPUT_ENABLE, "input enabled", NULL, false), PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT, "input schmitt trigger", NULL, false), PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT_ENABLE, "input schmitt enabled", NULL, false), PCONFDUMP(PIN_CONFIG_LOW_POWER_MODE, "pin low power", "mode", true), PCONFDUMP(PIN_CONFIG_OUTPUT_ENABLE, "output enabled", NULL, false), PCONFDUMP(PIN_CONFIG_OUTPUT, "pin output", "level", true), PCONFDUMP(PIN_CONFIG_POWER_SOURCE, "pin power source", "selector", true), PCONFDUMP(PIN_CONFIG_SLEEP_HARDWARE_STATE, "sleep hardware state", NULL, false), PCONFDUMP(PIN_CONFIG_SLEW_RATE, "slew rate", NULL, true), PCONFDUMP(PIN_CONFIG_SKEW_DELAY, "skew delay", NULL, true), }; static void pinconf_generic_dump_one(struct pinctrl_dev *pctldev, struct seq_file *s, const char *gname, unsigned pin, const struct pin_config_item *items, int nitems, int *print_sep) { int i; for (i = 0; i < nitems; i++) { unsigned long config; int ret; /* We want to check out this parameter */ config = pinconf_to_config_packed(items[i].param, 0); if (gname) ret = pin_config_group_get(dev_name(pctldev->dev), gname, &config); else ret = pin_config_get_for_pin(pctldev, pin, &config); /* These are legal errors */ if (ret == -EINVAL || ret == -ENOTSUPP) continue; if (ret) { seq_printf(s, "ERROR READING CONFIG SETTING %d ", i); continue; } /* comma between multiple configs */ if (*print_sep) seq_puts(s, ", "); *print_sep = 1; seq_puts(s, items[i].display); /* Print unit if available */ if (items[i].has_arg) { seq_printf(s, " (%u", pinconf_to_config_argument(config)); if (items[i].format) seq_printf(s, " %s)", items[i].format); else seq_puts(s, ")"); } } } /** * pinconf_generic_dump_pins - Print information about pin or group of pins * @pctldev: Pincontrol device * @s: File to print to * @gname: Group name specifying pins * @pin: Pin number specyfying pin * * Print the pinconf configuration for the requested pin(s) to @s. Pins can be * specified either by pin using @pin or by group using @gname. Only one needs * to be specified the other can be NULL/0. */ void pinconf_generic_dump_pins(struct pinctrl_dev *pctldev, struct seq_file *s, const char *gname, unsigned pin) { const struct pinconf_ops *ops = pctldev->desc->confops; int print_sep = 0; if (!ops->is_generic) return; /* generic parameters */ pinconf_generic_dump_one(pctldev, s, gname, pin, conf_items, ARRAY_SIZE(conf_items), &print_sep); /* driver-specific parameters */ if (pctldev->desc->num_custom_params && pctldev->desc->custom_conf_items) pinconf_generic_dump_one(pctldev, s, gname, pin, pctldev->desc->custom_conf_items, pctldev->desc->num_custom_params, &print_sep); } void pinconf_generic_dump_config(struct pinctrl_dev *pctldev, struct seq_file *s, unsigned long config) { int i; for (i = 0; i < ARRAY_SIZE(conf_items); i++) { if (pinconf_to_config_param(config) != conf_items[i].param) continue; seq_printf(s, "%s: 0x%x", conf_items[i].display, pinconf_to_config_argument(config)); } if (!pctldev->desc->num_custom_params || !pctldev->desc->custom_conf_items) return; for (i = 0; i < pctldev->desc->num_custom_params; i++) { if (pinconf_to_config_param(config) != pctldev->desc->custom_conf_items[i].param) continue; seq_printf(s, "%s: 0x%x", pctldev->desc->custom_conf_items[i].display, pinconf_to_config_argument(config)); } } EXPORT_SYMBOL_GPL(pinconf_generic_dump_config); #endif #ifdef CONFIG_OF static const struct pinconf_generic_params dt_params[] = { { "bias-bus-hold", PIN_CONFIG_BIAS_BUS_HOLD, 0 }, { "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 }, { "bias-high-impedance", PIN_CONFIG_BIAS_HIGH_IMPEDANCE, 0 }, { "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 }, { "bias-pull-pin-default", PIN_CONFIG_BIAS_PULL_PIN_DEFAULT, 1 }, { "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 }, { "drive-open-drain", PIN_CONFIG_DRIVE_OPEN_DRAIN, 0 }, { "drive-open-source", PIN_CONFIG_DRIVE_OPEN_SOURCE, 0 }, { "drive-push-pull", PIN_CONFIG_DRIVE_PUSH_PULL, 0 }, { "drive-strength", PIN_CONFIG_DRIVE_STRENGTH, 0 }, { "drive-strength-microamp", PIN_CONFIG_DRIVE_STRENGTH_UA, 0 }, { "input-debounce", PIN_CONFIG_INPUT_DEBOUNCE, 0 }, { "input-disable", PIN_CONFIG_INPUT_ENABLE, 0 }, { "input-enable", PIN_CONFIG_INPUT_ENABLE, 1 }, { "input-schmitt", PIN_CONFIG_INPUT_SCHMITT, 0 }, { "input-schmitt-disable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 0 }, { "input-schmitt-enable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 1 }, { "low-power-disable", PIN_CONFIG_LOW_POWER_MODE, 0 }, { "low-power-enable", PIN_CONFIG_LOW_POWER_MODE, 1 }, { "output-disable", PIN_CONFIG_OUTPUT_ENABLE, 0 }, { "output-enable", PIN_CONFIG_OUTPUT_ENABLE, 1 }, { "output-high", PIN_CONFIG_OUTPUT, 1, }, { "output-low", PIN_CONFIG_OUTPUT, 0, }, { "power-source", PIN_CONFIG_POWER_SOURCE, 0 }, { "sleep-hardware-state", PIN_CONFIG_SLEEP_HARDWARE_STATE, 0 }, { "slew-rate", PIN_CONFIG_SLEW_RATE, 0 }, { "skew-delay", PIN_CONFIG_SKEW_DELAY, 0 }, }; /** * parse_dt_cfg() - Parse DT pinconf parameters * @np: DT node * @params: Array of describing generic parameters * @count: Number of entries in @params * @cfg: Array of parsed config options * @ncfg: Number of entries in @cfg * * Parse the config options described in @params from @np and puts the result * in @cfg. @cfg does not need to be empty, entries are added beginning at * @ncfg. @ncfg is updated to reflect the number of entries after parsing. @cfg * needs to have enough memory allocated to hold all possible entries. */ static void parse_dt_cfg(struct device_node *np, const struct pinconf_generic_params *params, unsigned int count, unsigned long *cfg, unsigned int *ncfg) { int i; for (i = 0; i < count; i++) { u32 val; int ret; const struct pinconf_generic_params *par = ¶ms[i]; ret = of_property_read_u32(np, par->property, &val); /* property not found */ if (ret == -EINVAL) continue; /* use default value, when no value is specified */ if (ret) val = par->default_value; pr_debug("found %s with value %u\n", par->property, val); cfg[*ncfg] = pinconf_to_config_packed(par->param, val); (*ncfg)++; } } /** * pinconf_generic_parse_dt_config() * parse the config properties into generic pinconfig values. * @np: node containing the pinconfig properties * @configs: array with nconfigs entries containing the generic pinconf values * must be freed when no longer necessary. * @nconfigs: umber of configurations */ int pinconf_generic_parse_dt_config(struct device_node *np, struct pinctrl_dev *pctldev, unsigned long **configs, unsigned int *nconfigs) { unsigned long *cfg; unsigned int max_cfg, ncfg = 0; int ret; if (!np) return -EINVAL; /* allocate a temporary array big enough to hold one of each option */ max_cfg = ARRAY_SIZE(dt_params); if (pctldev) max_cfg += pctldev->desc->num_custom_params; cfg = kcalloc(max_cfg, sizeof(*cfg), GFP_KERNEL); if (!cfg) return -ENOMEM; parse_dt_cfg(np, dt_params, ARRAY_SIZE(dt_params), cfg, &ncfg); if (pctldev && pctldev->desc->num_custom_params && pctldev->desc->custom_params) parse_dt_cfg(np, pctldev->desc->custom_params, pctldev->desc->num_custom_params, cfg, &ncfg); ret = 0; /* no configs found at all */ if (ncfg == 0) { *configs = NULL; *nconfigs = 0; goto out; } /* * Now limit the number of configs to the real number of * found properties. */ *configs = kmemdup(cfg, ncfg * sizeof(unsigned long), GFP_KERNEL); if (!*configs) { ret = -ENOMEM; goto out; } *nconfigs = ncfg; out: kfree(cfg); return ret; } EXPORT_SYMBOL_GPL(pinconf_generic_parse_dt_config); int pinconf_generic_dt_subnode_to_map(struct pinctrl_dev *pctldev, struct device_node *np, struct pinctrl_map **map, unsigned *reserved_maps, unsigned *num_maps, enum pinctrl_map_type type) { int ret; const char *function; struct device *dev = pctldev->dev; unsigned long *configs = NULL; unsigned num_configs = 0; unsigned reserve, strings_count; struct property *prop; const char *group; const char *subnode_target_type = "pins"; ret = of_property_count_strings(np, "pins"); if (ret < 0) { ret = of_property_count_strings(np, "groups"); if (ret < 0) /* skip this node; may contain config child nodes */ return 0; if (type == PIN_MAP_TYPE_INVALID) type = PIN_MAP_TYPE_CONFIGS_GROUP; subnode_target_type = "groups"; } else { if (type == PIN_MAP_TYPE_INVALID) type = PIN_MAP_TYPE_CONFIGS_PIN; } strings_count = ret; ret = of_property_read_string(np, "function", &function); if (ret < 0) { /* EINVAL=missing, which is fine since it's optional */ if (ret != -EINVAL) dev_err(dev, "%pOF: could not parse property function\n", np); function = NULL; } ret = pinconf_generic_parse_dt_config(np, pctldev, &configs, &num_configs); if (ret < 0) { dev_err(dev, "%pOF: could not parse node property\n", np); return ret; } reserve = 0; if (function != NULL) reserve++; if (num_configs) reserve++; reserve *= strings_count; ret = pinctrl_utils_reserve_map(pctldev, map, reserved_maps, num_maps, reserve); if (ret < 0) goto exit; of_property_for_each_string(np, subnode_target_type, prop, group) { if (function) { ret = pinctrl_utils_add_map_mux(pctldev, map, reserved_maps, num_maps, group, function); if (ret < 0) goto exit; } if (num_configs) { ret = pinctrl_utils_add_map_configs(pctldev, map, reserved_maps, num_maps, group, configs, num_configs, type); if (ret < 0) goto exit; } } ret = 0; exit: kfree(configs); return ret; } EXPORT_SYMBOL_GPL(pinconf_generic_dt_subnode_to_map); int pinconf_generic_dt_node_to_map(struct pinctrl_dev *pctldev, struct device_node *np_config, struct pinctrl_map **map, unsigned *num_maps, enum pinctrl_map_type type) { unsigned reserved_maps; struct device_node *np; int ret; reserved_maps = 0; *map = NULL; *num_maps = 0; ret = pinconf_generic_dt_subnode_to_map(pctldev, np_config, map, &reserved_maps, num_maps, type); if (ret < 0) goto exit; for_each_available_child_of_node(np_config, np) { ret = pinconf_generic_dt_subnode_to_map(pctldev, np, map, &reserved_maps, num_maps, type); if (ret < 0) goto exit; } return 0; exit: pinctrl_utils_free_map(pctldev, *map, *num_maps); return ret; } EXPORT_SYMBOL_GPL(pinconf_generic_dt_node_to_map); void pinconf_generic_dt_free_map(struct pinctrl_dev *pctldev, struct pinctrl_map *map, unsigned num_maps) { pinctrl_utils_free_map(pctldev, map, num_maps); } EXPORT_SYMBOL_GPL(pinconf_generic_dt_free_map); #endif