| // 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> |
| |
| DECLARE_GLOBAL_DATA_PTR; |
| |
| /** |
| * 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 |
| |
| /** |
| * 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 |
| * @is_group: target of operation (true: pin group, false: pin) |
| * @selector: pin selector or group selector, depending on @is_group |
| * @return: 0 on success, or negative error code on failure |
| */ |
| static int pinctrl_generic_set_state_one(struct udevice *dev, |
| struct udevice *config, |
| bool is_group, unsigned selector) |
| { |
| const void *fdt = gd->fdt_blob; |
| int node_offset = dev_of_offset(config); |
| const char *propname; |
| const void *value; |
| int prop_offset, len, func_selector, param, ret; |
| u32 arg, default_val; |
| |
| for (prop_offset = fdt_first_property_offset(fdt, node_offset); |
| prop_offset > 0; |
| prop_offset = fdt_next_property_offset(fdt, prop_offset)) { |
| value = fdt_getprop_by_offset(fdt, prop_offset, |
| &propname, &len); |
| if (!value) |
| return -EINVAL; |
| |
| if (!strcmp(propname, "function")) { |
| func_selector = pinmux_func_name_to_selector(dev, |
| value); |
| if (func_selector < 0) |
| return func_selector; |
| ret = pinmux_enable_setting(dev, is_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, is_group, |
| selector, param, arg); |
| } |
| |
| if (ret) |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * 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) |
| { |
| const void *fdt = gd->fdt_blob; |
| int node = dev_of_offset(config); |
| const char *subnode_target_type = "pins"; |
| bool is_group = false; |
| const char *name; |
| int strings_count, selector, i, ret; |
| |
| strings_count = fdt_stringlist_count(fdt, node, subnode_target_type); |
| if (strings_count < 0) { |
| subnode_target_type = "groups"; |
| is_group = true; |
| strings_count = fdt_stringlist_count(fdt, node, |
| subnode_target_type); |
| if (strings_count < 0) { |
| /* skip this node; may contain config child nodes */ |
| return 0; |
| } |
| } |
| |
| for (i = 0; i < strings_count; i++) { |
| name = fdt_stringlist_get(fdt, node, subnode_target_type, i, |
| NULL); |
| if (!name) |
| return -EINVAL; |
| |
| if (is_group) |
| selector = pinctrl_group_name_to_selector(dev, name); |
| else |
| selector = pinctrl_pin_name_to_selector(dev, name); |
| if (selector < 0) |
| return selector; |
| |
| ret = pinctrl_generic_set_state_one(dev, config, |
| is_group, 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; |
| } |