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