reset-uclass.c
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/*
* Copyright (c) 2016, NVIDIA CORPORATION.
*
* SPDX-License-Identifier: GPL-2.0
*/
#include <common.h>
#include <dm.h>
#include <fdtdec.h>
#include <reset.h>
#include <reset-uclass.h>
DECLARE_GLOBAL_DATA_PTR;
static inline struct reset_ops *reset_dev_ops(struct udevice *dev)
{
return (struct reset_ops *)dev->driver->ops;
}
static int reset_of_xlate_default(struct reset_ctl *reset_ctl,
struct ofnode_phandle_args *args)
{
debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
if (args->args_count != 1) {
debug("Invaild args_count: %d\n", args->args_count);
return -EINVAL;
}
reset_ctl->id = args->args[0];
return 0;
}
int reset_get_by_index(struct udevice *dev, int index,
struct reset_ctl *reset_ctl)
{
struct ofnode_phandle_args args;
int ret;
struct udevice *dev_reset;
struct reset_ops *ops;
debug("%s(dev=%p, index=%d, reset_ctl=%p)\n", __func__, dev, index,
reset_ctl);
reset_ctl->dev = NULL;
ret = dev_read_phandle_with_args(dev, "resets", "#reset-cells", 0,
index, &args);
if (ret) {
debug("%s: fdtdec_parse_phandle_with_args() failed: %d\n",
__func__, ret);
return ret;
}
ret = uclass_get_device_by_ofnode(UCLASS_RESET, args.node,
&dev_reset);
if (ret) {
debug("%s: uclass_get_device_by_ofnode() failed: %d\n",
__func__, ret);
debug("%s %d\n", ofnode_get_name(args.node), args.args[0]);
return ret;
}
ops = reset_dev_ops(dev_reset);
reset_ctl->dev = dev_reset;
if (ops->of_xlate)
ret = ops->of_xlate(reset_ctl, &args);
else
ret = reset_of_xlate_default(reset_ctl, &args);
if (ret) {
debug("of_xlate() failed: %d\n", ret);
return ret;
}
ret = ops->request(reset_ctl);
if (ret) {
debug("ops->request() failed: %d\n", ret);
return ret;
}
return 0;
}
int reset_get_by_name(struct udevice *dev, const char *name,
struct reset_ctl *reset_ctl)
{
int index;
debug("%s(dev=%p, name=%s, reset_ctl=%p)\n", __func__, dev, name,
reset_ctl);
reset_ctl->dev = NULL;
index = dev_read_stringlist_search(dev, "reset-names", name);
if (index < 0) {
debug("fdt_stringlist_search() failed: %d\n", index);
return index;
}
return reset_get_by_index(dev, index, reset_ctl);
}
int reset_request(struct reset_ctl *reset_ctl)
{
struct reset_ops *ops = reset_dev_ops(reset_ctl->dev);
debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
return ops->request(reset_ctl);
}
int reset_free(struct reset_ctl *reset_ctl)
{
struct reset_ops *ops = reset_dev_ops(reset_ctl->dev);
debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
return ops->free(reset_ctl);
}
int reset_assert(struct reset_ctl *reset_ctl)
{
struct reset_ops *ops = reset_dev_ops(reset_ctl->dev);
debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
return ops->rst_assert(reset_ctl);
}
int reset_deassert(struct reset_ctl *reset_ctl)
{
struct reset_ops *ops = reset_dev_ops(reset_ctl->dev);
debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
return ops->rst_deassert(reset_ctl);
}
int reset_release_all(struct reset_ctl *reset_ctl, int count)
{
int i, ret;
for (i = 0; i < count; i++) {
debug("%s(reset_ctl[%d]=%p)\n", __func__, i, &reset_ctl[i]);
/* check if reset has been previously requested */
if (!reset_ctl[i].dev)
continue;
ret = reset_assert(&reset_ctl[i]);
if (ret)
return ret;
ret = reset_free(&reset_ctl[i]);
if (ret)
return ret;
}
return 0;
}
UCLASS_DRIVER(reset) = {
.id = UCLASS_RESET,
.name = "reset",
};