freebsd-dev/sys/dev/fdt/fdt_pinctrl.c
2015-04-10 13:50:57 +00:00

151 lines
4.3 KiB
C

/*-
* Copyright (c) 2014 Ian Lepore <ian@freebsd.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <sys/cdefs.h>
#include <sys/param.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include "fdt_pinctrl_if.h"
#include <dev/fdt/fdt_common.h>
#include <dev/fdt/fdt_pinctrl.h>
int
fdt_pinctrl_configure(device_t client, u_int index)
{
device_t pinctrl;
phandle_t *configs;
int i, nconfigs;
char name[16];
snprintf(name, sizeof(name), "pinctrl-%u", index);
nconfigs = OF_getencprop_alloc(ofw_bus_get_node(client), name,
sizeof(*configs), (void **)&configs);
if (nconfigs < 0)
return (ENOENT);
if (nconfigs == 0)
return (0); /* Empty property is documented as valid. */
for (i = 0; i < nconfigs; i++) {
if ((pinctrl = OF_device_from_xref(configs[i])) != NULL)
FDT_PINCTRL_CONFIGURE(pinctrl, configs[i]);
}
free(configs, M_OFWPROP);
return (0);
}
int
fdt_pinctrl_configure_by_name(device_t client, const char * name)
{
char * names;
int i, offset, nameslen;
nameslen = OF_getprop_alloc(ofw_bus_get_node(client), "pinctrl-names",
sizeof(*names), (void **)&names);
if (nameslen <= 0)
return (ENOENT);
for (i = 0, offset = 0; offset < nameslen; i++) {
if (strcmp(name, &names[offset]) == 0)
break;
offset += strlen(&names[offset]) + 1;
}
free(names, M_OFWPROP);
if (offset < nameslen)
return (fdt_pinctrl_configure(client, i));
else
return (ENOENT);
}
static int
pinctrl_register_children(device_t pinctrl, phandle_t parent,
const char *pinprop)
{
phandle_t node;
/*
* Recursively descend from parent, looking for nodes that have the
* given property, and associate the pinctrl device_t with each one.
*/
for (node = OF_child(parent); node != 0; node = OF_peer(node)) {
pinctrl_register_children(pinctrl, node, pinprop);
if (pinprop == NULL || OF_hasprop(node, pinprop)) {
OF_device_register_xref(OF_xref_from_node(node),
pinctrl);
}
}
return (0);
}
int
fdt_pinctrl_register(device_t pinctrl, const char *pinprop)
{
phandle_t node;
node = ofw_bus_get_node(pinctrl);
OF_device_register_xref(OF_xref_from_node(node), pinctrl);
return (pinctrl_register_children(pinctrl, node, pinprop));
}
static int
pinctrl_configure_children(device_t pinctrl, phandle_t parent)
{
phandle_t node, *configs;
int i, nconfigs;
for (node = OF_child(parent); node != 0; node = OF_peer(node)) {
if (!fdt_is_enabled(node))
continue;
pinctrl_configure_children(pinctrl, node);
nconfigs = OF_getencprop_alloc(node, "pinctrl-0",
sizeof(*configs), (void **)&configs);
if (nconfigs <= 0)
continue;
if (bootverbose) {
char name[32];
OF_getprop(node, "name", &name, sizeof(name));
printf("Processing %d pin-config node(s) in pinctrl-0 for %s\n",
nconfigs, name);
}
for (i = 0; i < nconfigs; i++) {
if (OF_device_from_xref(configs[i]) == pinctrl)
FDT_PINCTRL_CONFIGURE(pinctrl, configs[i]);
}
free(configs, M_OFWPROP);
}
return (0);
}
int
fdt_pinctrl_configure_tree(device_t pinctrl)
{
return (pinctrl_configure_children(pinctrl, OF_peer(0)));
}