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/* $OpenBSD: ofw_gpio.c,v 1.3 2019/08/26 09:22:27 kettenis Exp $ */
/*
* Copyright (c) 2016, 2019 Mark Kettenis
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_gpio.h>
LIST_HEAD(, gpio_controller) gpio_controllers =
LIST_HEAD_INITIALIZER(gpio_controllers);
void
gpio_controller_register(struct gpio_controller *gc)
{
int child;
gc->gc_cells = OF_getpropint(gc->gc_node, "#gpio-cells", 2);
gc->gc_phandle = OF_getpropint(gc->gc_node, "phandle", 0);
if (gc->gc_phandle == 0)
return;
LIST_INSERT_HEAD(&gpio_controllers, gc, gc_list);
/* Process GPIO hogs. */
for (child = OF_child(gc->gc_node); child; child = OF_peer(child)) {
uint32_t *gpios;
uint32_t *gpio;
int len, config, active;
if (OF_getproplen(child, "gpio-hog") != 0)
continue;
len = OF_getproplen(child, "gpios");
if (len <= 0)
continue;
/*
* These need to be processed in the order prescribed
* by the device tree binding. First match wins.
*/
if (OF_getproplen(child, "input") == 0) {
config = GPIO_CONFIG_INPUT;
active = 0;
} else if (OF_getproplen(child, "output-low") == 0) {
config = GPIO_CONFIG_OUTPUT;
active = 0;
} else if (OF_getproplen(child, "output-high") == 0) {
config = GPIO_CONFIG_OUTPUT;
active = 1;
} else
continue;
gpios = malloc(len, M_TEMP, M_WAITOK);
OF_getpropintarray(child, "gpios", gpios, len);
gpio = gpios;
while (gpio && gpio < gpios + (len / sizeof(uint32_t))) {
gc->gc_config_pin(gc->gc_cookie, gpio, config);
if (config & GPIO_CONFIG_OUTPUT)
gc->gc_set_pin(gc->gc_cookie, gpio, active);
gpio += gc->gc_cells;
}
free(gpios, M_TEMP, len);
}
}
void
gpio_controller_config_pin(uint32_t *cells, int config)
{
struct gpio_controller *gc;
uint32_t phandle = cells[0];
LIST_FOREACH(gc, &gpio_controllers, gc_list) {
if (gc->gc_phandle == phandle)
break;
}
if (gc && gc->gc_config_pin)
gc->gc_config_pin(gc->gc_cookie, &cells[1], config);
}
int
gpio_controller_get_pin(uint32_t *cells)
{
struct gpio_controller *gc;
uint32_t phandle = cells[0];
int val = 0;
LIST_FOREACH(gc, &gpio_controllers, gc_list) {
if (gc->gc_phandle == phandle)
break;
}
if (gc && gc->gc_get_pin)
val = gc->gc_get_pin(gc->gc_cookie, &cells[1]);
return val;
}
void
gpio_controller_set_pin(uint32_t *cells, int val)
{
struct gpio_controller *gc;
uint32_t phandle = cells[0];
LIST_FOREACH(gc, &gpio_controllers, gc_list) {
if (gc->gc_phandle == phandle)
break;
}
if (gc && gc->gc_set_pin)
gc->gc_set_pin(gc->gc_cookie, &cells[1], val);
}
uint32_t *
gpio_controller_next_pin(uint32_t *cells)
{
struct gpio_controller *gc;
uint32_t phandle = cells[0];
LIST_FOREACH(gc, &gpio_controllers, gc_list)
if (gc->gc_phandle == phandle)
return cells + gc->gc_cells + 1;
return NULL;
}
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