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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;
}