mirror of
https://github.com/AsahiLinux/u-boot
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83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
360 lines
9.2 KiB
C
360 lines
9.2 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 <linux/compat.h>
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#include <dm/pinctrl.h>
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DECLARE_GLOBAL_DATA_PTR;
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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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/**
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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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* @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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* @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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bool is_group, unsigned selector)
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{
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const void *fdt = gd->fdt_blob;
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int node_offset = dev_of_offset(config);
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const char *propname;
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const void *value;
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int prop_offset, len, func_selector, param, ret;
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u32 arg, default_val;
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for (prop_offset = fdt_first_property_offset(fdt, node_offset);
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prop_offset > 0;
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prop_offset = fdt_next_property_offset(fdt, prop_offset)) {
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value = fdt_getprop_by_offset(fdt, prop_offset,
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&propname, &len);
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if (!value)
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return -EINVAL;
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if (!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, is_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, is_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_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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const void *fdt = gd->fdt_blob;
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int node = dev_of_offset(config);
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const char *subnode_target_type = "pins";
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bool is_group = false;
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const char *name;
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int strings_count, selector, i, ret;
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strings_count = fdt_stringlist_count(fdt, node, subnode_target_type);
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if (strings_count < 0) {
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subnode_target_type = "groups";
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is_group = true;
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strings_count = fdt_stringlist_count(fdt, node,
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subnode_target_type);
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if (strings_count < 0) {
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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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}
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for (i = 0; i < strings_count; i++) {
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name = fdt_stringlist_get(fdt, node, subnode_target_type, i,
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NULL);
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if (!name)
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return -EINVAL;
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if (is_group)
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selector = pinctrl_group_name_to_selector(dev, name);
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else
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selector = pinctrl_pin_name_to_selector(dev, name);
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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,
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is_group, 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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