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/*
* pinctrl.c - barebox pinctrl support
*
* Copyright (c) 2013 Sascha Hauer <s.hauer@pengutronix.de>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <common.h>
#include <malloc.h>
#include <pinctrl.h>
static LIST_HEAD(pinctrl_list);
static struct pinctrl_device *find_pinctrl(struct device_node *node)
{
struct pinctrl_device *pdev;
list_for_each_entry(pdev, &pinctrl_list, list)
if (pdev->node == node)
return pdev;
return NULL;
}
static int pinctrl_config_one(struct device_node *np)
{
struct pinctrl_device *pdev;
struct device_node *pinctrl_node = np;
while (1) {
pinctrl_node = pinctrl_node->parent;
if (!pinctrl_node)
return -ENODEV;
pdev = find_pinctrl(pinctrl_node);
if (pdev)
break;
}
return pdev->ops->set_state(pdev, np);
}
int pinctrl_select_state(struct device_d *dev, const char *name)
{
int state, ret;
char *propname;
struct property *prop;
const __be32 *list;
int size, config;
phandle phandle;
struct device_node *np_config, *np;
const char *statename;
np = dev->device_node;
if (!np)
return 0;
if (!of_find_property(np, "pinctrl-0", NULL))
return 0;
/* For each defined state ID */
for (state = 0; ; state++) {
/* Retrieve the pinctrl-* property */
propname = asprintf("pinctrl-%d", state);
prop = of_find_property(np, propname, NULL);
free(propname);
if (!prop) {
ret = -ENODEV;
break;
}
size = prop->length;
list = prop->value;
size /= sizeof(*list);
/* Determine whether pinctrl-names property names the state */
ret = of_property_read_string_index(np, "pinctrl-names",
state, &statename);
/*
* If not, statename is just the integer state ID. But rather
* than dynamically allocate it and have to free it later,
* just point part way into the property name for the string.
*/
if (ret < 0) {
/* strlen("pinctrl-") == 8 */
statename = prop->name + 8;
}
if (strcmp(name, statename))
continue;
/* For every referenced pin configuration node in it */
for (config = 0; config < size; config++) {
phandle = be32_to_cpup(list++);
/* Look up the pin configuration node */
np_config = of_find_node_by_phandle(phandle);
if (!np_config) {
pr_err("prop %s %s index %i invalid phandle\n",
np->full_name, prop->name, config);
ret = -EINVAL;
goto err;
}
/* Parse the node */
ret = pinctrl_config_one(np_config);
if (ret < 0)
goto err;
}
return 0;
}
err:
return ret;
}
int pinctrl_select_state_default(struct device_d *dev)
{
return pinctrl_select_state(dev, "default");
}
int pinctrl_register(struct pinctrl_device *pdev)
{
BUG_ON(!pdev->dev->device_node);
list_add_tail(&pdev->list, &pinctrl_list);
pdev->node = pdev->dev->device_node;
pinctrl_select_state_default(pdev->dev);
return 0;
}
void pinctrl_unregister(struct pinctrl_device *pdev)
{
list_del(&pdev->list);
}
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