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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Copyright (C) 2015 Masahiro Yamada <yamada.masahiro@socionext.com>
- */
- #include <common.h>
- #include <dm.h>
- #include <dm/device_compat.h>
- #include <linux/compat.h>
- #include <dm/pinctrl.h>
- /**
- * pinctrl_pin_name_to_selector() - return the pin selector for a pin
- *
- * @dev: pin controller device
- * @pin: the pin name to look up
- * @return: pin selector, or negative error code on failure
- */
- static int pinctrl_pin_name_to_selector(struct udevice *dev, const char *pin)
- {
- const struct pinctrl_ops *ops = pinctrl_get_ops(dev);
- unsigned npins, selector;
- if (!ops->get_pins_count || !ops->get_pin_name) {
- dev_dbg(dev, "get_pins_count or get_pin_name missing\n");
- return -ENOSYS;
- }
- npins = ops->get_pins_count(dev);
- /* See if this pctldev has this pin */
- for (selector = 0; selector < npins; selector++) {
- const char *pname = ops->get_pin_name(dev, selector);
- if (!strcmp(pin, pname))
- return selector;
- }
- return -ENOSYS;
- }
- /**
- * pinctrl_group_name_to_selector() - return the group selector for a group
- *
- * @dev: pin controller device
- * @group: the pin group name to look up
- * @return: pin group selector, or negative error code on failure
- */
- static int pinctrl_group_name_to_selector(struct udevice *dev,
- const char *group)
- {
- const struct pinctrl_ops *ops = pinctrl_get_ops(dev);
- unsigned ngroups, selector;
- if (!ops->get_groups_count || !ops->get_group_name) {
- dev_dbg(dev, "get_groups_count or get_group_name missing\n");
- return -ENOSYS;
- }
- ngroups = ops->get_groups_count(dev);
- /* See if this pctldev has this group */
- for (selector = 0; selector < ngroups; selector++) {
- const char *gname = ops->get_group_name(dev, selector);
- if (!strcmp(group, gname))
- return selector;
- }
- return -ENOSYS;
- }
- #if CONFIG_IS_ENABLED(PINMUX)
- /**
- * pinmux_func_name_to_selector() - return the function selector for a function
- *
- * @dev: pin controller device
- * @function: the function name to look up
- * @return: function selector, or negative error code on failure
- */
- static int pinmux_func_name_to_selector(struct udevice *dev,
- const char *function)
- {
- const struct pinctrl_ops *ops = pinctrl_get_ops(dev);
- unsigned nfuncs, selector = 0;
- if (!ops->get_functions_count || !ops->get_function_name) {
- dev_dbg(dev,
- "get_functions_count or get_function_name missing\n");
- return -ENOSYS;
- }
- nfuncs = ops->get_functions_count(dev);
- /* See if this pctldev has this function */
- for (selector = 0; selector < nfuncs; selector++) {
- const char *fname = ops->get_function_name(dev, selector);
- if (!strcmp(function, fname))
- return selector;
- }
- return -ENOSYS;
- }
- /**
- * pinmux_enable_setting() - enable pin-mux setting for a certain pin/group
- *
- * @dev: pin controller device
- * @is_group: target of operation (true: pin group, false: pin)
- * @selector: pin selector or group selector, depending on @is_group
- * @func_selector: function selector
- * @return: 0 on success, or negative error code on failure
- */
- static int pinmux_enable_setting(struct udevice *dev, bool is_group,
- unsigned selector, unsigned func_selector)
- {
- const struct pinctrl_ops *ops = pinctrl_get_ops(dev);
- if (is_group) {
- if (!ops->pinmux_group_set) {
- dev_dbg(dev, "pinmux_group_set op missing\n");
- return -ENOSYS;
- }
- return ops->pinmux_group_set(dev, selector, func_selector);
- } else {
- if (!ops->pinmux_set) {
- dev_dbg(dev, "pinmux_set op missing\n");
- return -ENOSYS;
- }
- return ops->pinmux_set(dev, selector, func_selector);
- }
- }
- #else
- static int pinmux_func_name_to_selector(struct udevice *dev,
- const char *function)
- {
- return 0;
- }
- static int pinmux_enable_setting(struct udevice *dev, bool is_group,
- unsigned selector, unsigned func_selector)
- {
- return 0;
- }
- #endif
- #if CONFIG_IS_ENABLED(PINCONF)
- /**
- * pinconf_prop_name_to_param() - return parameter ID for a property name
- *
- * @dev: pin controller device
- * @property: property name in DTS, such as "bias-pull-up", "slew-rate", etc.
- * @default_value: return default value in case no value is specified in DTS
- * @return: return pamater ID, or negative error code on failure
- */
- static int pinconf_prop_name_to_param(struct udevice *dev,
- const char *property, u32 *default_value)
- {
- const struct pinctrl_ops *ops = pinctrl_get_ops(dev);
- const struct pinconf_param *p, *end;
- if (!ops->pinconf_num_params || !ops->pinconf_params) {
- dev_dbg(dev, "pinconf_num_params or pinconf_params missing\n");
- return -ENOSYS;
- }
- p = ops->pinconf_params;
- end = p + ops->pinconf_num_params;
- /* See if this pctldev supports this parameter */
- for (; p < end; p++) {
- if (!strcmp(property, p->property)) {
- *default_value = p->default_value;
- return p->param;
- }
- }
- return -ENOSYS;
- }
- /**
- * pinconf_enable_setting() - apply pin configuration for a certain pin/group
- *
- * @dev: pin controller device
- * @is_group: target of operation (true: pin group, false: pin)
- * @selector: pin selector or group selector, depending on @is_group
- * @param: configuration paramter
- * @argument: argument taken by some configuration parameters
- * @return: 0 on success, or negative error code on failure
- */
- static int pinconf_enable_setting(struct udevice *dev, bool is_group,
- unsigned selector, unsigned param,
- u32 argument)
- {
- const struct pinctrl_ops *ops = pinctrl_get_ops(dev);
- if (is_group) {
- if (!ops->pinconf_group_set) {
- dev_dbg(dev, "pinconf_group_set op missing\n");
- return -ENOSYS;
- }
- return ops->pinconf_group_set(dev, selector, param,
- argument);
- } else {
- if (!ops->pinconf_set) {
- dev_dbg(dev, "pinconf_set op missing\n");
- return -ENOSYS;
- }
- return ops->pinconf_set(dev, selector, param, argument);
- }
- }
- #else
- static int pinconf_prop_name_to_param(struct udevice *dev,
- const char *property, u32 *default_value)
- {
- return -ENOSYS;
- }
- static int pinconf_enable_setting(struct udevice *dev, bool is_group,
- unsigned selector, unsigned param,
- u32 argument)
- {
- return 0;
- }
- #endif
- enum pinmux_subnode_type {
- PST_NONE = 0,
- PST_PIN,
- PST_GROUP,
- PST_PINMUX,
- };
- /**
- * pinctrl_generic_set_state_one() - set state for a certain pin/group
- * Apply all pin multiplexing and pin configurations specified by @config
- * for a given pin or pin group.
- *
- * @dev: pin controller device
- * @config: pseudo device pointing to config node
- * @subnode_type: target of operation (pin, group, or pin specified by a pinmux
- * group)
- * @selector: pin selector or group selector, depending on @subnode_type
- * @return: 0 on success, or negative error code on failure
- */
- static int pinctrl_generic_set_state_one(struct udevice *dev,
- struct udevice *config,
- enum pinmux_subnode_type subnode_type,
- unsigned selector)
- {
- const char *propname;
- const void *value;
- struct ofprop property;
- int len, func_selector, param, ret;
- u32 arg, default_val;
- assert(subnode_type != PST_NONE);
- dev_for_each_property(property, config) {
- value = dev_read_prop_by_prop(&property, &propname, &len);
- if (!value)
- return -EINVAL;
- /* pinmux subnodes already have their muxing set */
- if (subnode_type != PST_PINMUX &&
- !strcmp(propname, "function")) {
- func_selector = pinmux_func_name_to_selector(dev,
- value);
- if (func_selector < 0)
- return func_selector;
- ret = pinmux_enable_setting(dev,
- subnode_type == PST_GROUP,
- selector,
- func_selector);
- } else {
- param = pinconf_prop_name_to_param(dev, propname,
- &default_val);
- if (param < 0)
- continue; /* just skip unknown properties */
- if (len >= sizeof(fdt32_t))
- arg = fdt32_to_cpu(*(fdt32_t *)value);
- else
- arg = default_val;
- ret = pinconf_enable_setting(dev,
- subnode_type == PST_GROUP,
- selector, param, arg);
- }
- if (ret)
- return ret;
- }
- return 0;
- }
- /**
- * pinctrl_generic_get_subnode_type() - determine whether there is a valid
- * pins, groups, or pinmux property in the config node
- *
- * @dev: pin controller device
- * @config: pseudo device pointing to config node
- * @count: number of specifiers contained within the property
- * @return: the type of the subnode, or PST_NONE
- */
- static enum pinmux_subnode_type pinctrl_generic_get_subnode_type(struct udevice *dev,
- struct udevice *config,
- int *count)
- {
- const struct pinctrl_ops *ops = pinctrl_get_ops(dev);
- *count = dev_read_string_count(config, "pins");
- if (*count >= 0)
- return PST_PIN;
- *count = dev_read_string_count(config, "groups");
- if (*count >= 0)
- return PST_GROUP;
- if (ops->pinmux_property_set) {
- *count = dev_read_size(config, "pinmux");
- if (*count >= 0 && !(*count % sizeof(u32))) {
- *count /= sizeof(u32);
- return PST_PINMUX;
- }
- }
- *count = 0;
- return PST_NONE;
- }
- /**
- * pinctrl_generic_set_state_subnode() - apply all settings in config node
- *
- * @dev: pin controller device
- * @config: pseudo device pointing to config node
- * @return: 0 on success, or negative error code on failure
- */
- static int pinctrl_generic_set_state_subnode(struct udevice *dev,
- struct udevice *config)
- {
- enum pinmux_subnode_type subnode_type;
- const char *name;
- int count, selector, i, ret, scratch;
- const u32 *pinmux_groups = NULL; /* prevent use-uninitialized warning */
- subnode_type = pinctrl_generic_get_subnode_type(dev, config, &count);
- debug("%s(%s, %s): count=%d\n", __func__, dev->name, config->name,
- count);
- if (subnode_type == PST_PINMUX) {
- pinmux_groups = dev_read_prop(config, "pinmux", &scratch);
- if (!pinmux_groups)
- return -EINVAL;
- }
- for (i = 0; i < count; i++) {
- switch (subnode_type) {
- case PST_PIN:
- ret = dev_read_string_index(config, "pins", i, &name);
- if (ret)
- return ret;
- selector = pinctrl_pin_name_to_selector(dev, name);
- break;
- case PST_GROUP:
- ret = dev_read_string_index(config, "groups", i, &name);
- if (ret)
- return ret;
- selector = pinctrl_group_name_to_selector(dev, name);
- break;
- case PST_PINMUX: {
- const struct pinctrl_ops *ops = pinctrl_get_ops(dev);
- u32 pinmux_group = fdt32_to_cpu(pinmux_groups[i]);
- /* Checked for in pinctrl_generic_get_subnode_type */
- selector = ops->pinmux_property_set(dev, pinmux_group);
- break;
- }
- case PST_NONE:
- default:
- /* skip this node; may contain config child nodes */
- return 0;
- }
- if (selector < 0)
- return selector;
- ret = pinctrl_generic_set_state_one(dev, config, subnode_type,
- selector);
- if (ret)
- return ret;
- }
- return 0;
- }
- int pinctrl_generic_set_state(struct udevice *dev, struct udevice *config)
- {
- struct udevice *child;
- int ret;
- ret = pinctrl_generic_set_state_subnode(dev, config);
- if (ret)
- return ret;
- for (device_find_first_child(config, &child);
- child;
- device_find_next_child(&child)) {
- ret = pinctrl_generic_set_state_subnode(dev, child);
- if (ret)
- return ret;
- }
- return 0;
- }
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