u-boot/drivers/reset/reset-uclass.c

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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2016, NVIDIA CORPORATION.
*/
#define LOG_CATEGORY UCLASS_RESET
#include <common.h>
#include <dm.h>
#include <fdtdec.h>
#include <log.h>
#include <malloc.h>
#include <reset.h>
#include <reset-uclass.h>
#include <dm/devres.h>
#include <dm/lists.h>
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("Invalid args_count: %d\n", args->args_count);
return -EINVAL;
}
reset_ctl->id = args->args[0];
return 0;
}
static int reset_get_by_index_tail(int ret, ofnode node,
struct ofnode_phandle_args *args,
const char *list_name, int index,
struct reset_ctl *reset_ctl)
{
struct udevice *dev_reset;
struct reset_ops *ops;
assert(reset_ctl);
reset_ctl->dev = NULL;
if (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 ? ops->request(reset_ctl) : 0;
if (ret) {
debug("ops->request() failed: %d\n", ret);
return ret;
}
return 0;
}
int reset_get_by_index(struct udevice *dev, int index,
struct reset_ctl *reset_ctl)
{
struct ofnode_phandle_args args;
int ret;
ret = dev_read_phandle_with_args(dev, "resets", "#reset-cells", 0,
index, &args);
return reset_get_by_index_tail(ret, dev_ofnode(dev), &args, "resets",
index > 0, reset_ctl);
}
int reset_get_by_index_nodev(ofnode node, int index,
struct reset_ctl *reset_ctl)
{
struct ofnode_phandle_args args;
int ret;
ret = ofnode_parse_phandle_with_args(node, "resets", "#reset-cells", 0,
index, &args);
return reset_get_by_index_tail(ret, node, &args, "resets",
index > 0, reset_ctl);
}
static int __reset_get_bulk(struct udevice *dev, ofnode node,
struct reset_ctl_bulk *bulk)
{
int i, ret, err, count;
bulk->count = 0;
count = ofnode_count_phandle_with_args(node, "resets", "#reset-cells",
0);
if (count < 1)
return count;
bulk->resets = devm_kcalloc(dev, count, sizeof(struct reset_ctl),
GFP_KERNEL);
if (!bulk->resets)
return -ENOMEM;
for (i = 0; i < count; i++) {
ret = reset_get_by_index_nodev(node, i, &bulk->resets[i]);
if (ret < 0)
goto bulk_get_err;
++bulk->count;
}
return 0;
bulk_get_err:
err = reset_release_all(bulk->resets, bulk->count);
if (err)
debug("%s: could release all resets for %p\n",
__func__, dev);
return ret;
}
int reset_get_bulk(struct udevice *dev, struct reset_ctl_bulk *bulk)
{
return __reset_get_bulk(dev, dev_ofnode(dev), bulk);
}
int reset_get_by_name(struct udevice *dev, const char *name,
struct reset_ctl *reset_ctl)
{
int index = 0;
debug("%s(dev=%p, name=%s, reset_ctl=%p)\n", __func__, dev, name,
reset_ctl);
reset_ctl->dev = NULL;
if (name) {
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 ? ops->request(reset_ctl) : 0;
}
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->rfree ? ops->rfree(reset_ctl) : 0;
}
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 ? ops->rst_assert(reset_ctl) : 0;
}
int reset_assert_bulk(struct reset_ctl_bulk *bulk)
{
int i, ret;
for (i = 0; i < bulk->count; i++) {
ret = reset_assert(&bulk->resets[i]);
if (ret < 0)
return ret;
}
return 0;
}
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 ? ops->rst_deassert(reset_ctl) : 0;
}
int reset_deassert_bulk(struct reset_ctl_bulk *bulk)
{
int i, ret;
for (i = 0; i < bulk->count; i++) {
ret = reset_deassert(&bulk->resets[i]);
if (ret < 0)
return ret;
}
return 0;
}
int reset_status(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_status ? ops->rst_status(reset_ctl) : 0;
}
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;
}
static void devm_reset_release(struct udevice *dev, void *res)
{
reset_free(res);
}
struct reset_ctl *devm_reset_control_get_by_index(struct udevice *dev,
int index)
{
int rc;
struct reset_ctl *reset_ctl;
reset_ctl = devres_alloc(devm_reset_release, sizeof(struct reset_ctl),
__GFP_ZERO);
if (unlikely(!reset_ctl))
return ERR_PTR(-ENOMEM);
rc = reset_get_by_index(dev, index, reset_ctl);
if (rc)
return ERR_PTR(rc);
devres_add(dev, reset_ctl);
return reset_ctl;
}
struct reset_ctl *devm_reset_control_get(struct udevice *dev, const char *id)
{
int rc;
struct reset_ctl *reset_ctl;
reset_ctl = devres_alloc(devm_reset_release, sizeof(struct reset_ctl),
__GFP_ZERO);
if (unlikely(!reset_ctl))
return ERR_PTR(-ENOMEM);
rc = reset_get_by_name(dev, id, reset_ctl);
if (rc)
return ERR_PTR(rc);
devres_add(dev, reset_ctl);
return reset_ctl;
}
struct reset_ctl *devm_reset_control_get_optional(struct udevice *dev,
const char *id)
{
struct reset_ctl *r = devm_reset_control_get(dev, id);
if (IS_ERR(r))
return NULL;
return r;
}
static void devm_reset_bulk_release(struct udevice *dev, void *res)
{
struct reset_ctl_bulk *bulk = res;
reset_release_all(bulk->resets, bulk->count);
}
struct reset_ctl_bulk *devm_reset_bulk_get_by_node(struct udevice *dev,
ofnode node)
{
int rc;
struct reset_ctl_bulk *bulk;
bulk = devres_alloc(devm_reset_bulk_release,
sizeof(struct reset_ctl_bulk),
__GFP_ZERO);
/* this looks like a leak, but devres takes care of it */
if (unlikely(!bulk))
return ERR_PTR(-ENOMEM);
rc = __reset_get_bulk(dev, node, bulk);
if (rc)
return ERR_PTR(rc);
devres_add(dev, bulk);
return bulk;
}
struct reset_ctl_bulk *devm_reset_bulk_get_optional_by_node(struct udevice *dev,
ofnode node)
{
struct reset_ctl_bulk *bulk;
bulk = devm_reset_bulk_get_by_node(dev, node);
if (IS_ERR(bulk))
return NULL;
return bulk;
}
struct reset_ctl_bulk *devm_reset_bulk_get(struct udevice *dev)
{
return devm_reset_bulk_get_by_node(dev, dev_ofnode(dev));
}
struct reset_ctl_bulk *devm_reset_bulk_get_optional(struct udevice *dev)
{
return devm_reset_bulk_get_optional_by_node(dev, dev_ofnode(dev));
}
UCLASS_DRIVER(reset) = {
.id = UCLASS_RESET,
.name = "reset",
};