bootcount-uclass.c
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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2018 Theobroma Systems Design und Consulting GmbH
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <bootcount.h>
int dm_bootcount_get(struct udevice *dev, u32 *bootcount)
{
struct bootcount_ops *ops = bootcount_get_ops(dev);
assert(ops);
if (!ops->get)
return -ENOSYS;
return ops->get(dev, bootcount);
}
int dm_bootcount_set(struct udevice *dev, const u32 bootcount)
{
struct bootcount_ops *ops = bootcount_get_ops(dev);
assert(ops);
if (!ops->set)
return -ENOSYS;
return ops->set(dev, bootcount);
}
/* Now implement the generic default functions */
void bootcount_store(ulong val)
{
struct udevice *dev = NULL;
ofnode node;
const char *propname = "u-boot,bootcount-device";
int ret = -ENODEV;
/*
* If there's a preferred bootcount device selected by the user (by
* setting '/chosen/u-boot,bootcount-device' in the DTS), try to use
* it if available.
*/
node = ofnode_get_chosen_node(propname);
if (ofnode_valid(node))
ret = uclass_get_device_by_ofnode(UCLASS_BOOTCOUNT, node, &dev);
/* If there was no user-selected device, use the first available one */
if (ret)
ret = uclass_get_device(UCLASS_BOOTCOUNT, 0, &dev);
if (dev)
ret = dm_bootcount_set(dev, val);
if (ret)
pr_debug("%s: failed to store 0x%lx\n", __func__, val);
}
ulong bootcount_load(void)
{
struct udevice *dev = NULL;
ofnode node;
const char *propname = "u-boot,bootcount-device";
int ret = -ENODEV;
u32 val;
/*
* If there's a preferred bootcount device selected by the user (by
* setting '/chosen/u-boot,bootcount-device' in the DTS), try to use
* it if available.
*/
node = ofnode_get_chosen_node(propname);
if (ofnode_valid(node))
ret = uclass_get_device_by_ofnode(UCLASS_BOOTCOUNT, node, &dev);
/* If there was no user-selected device, use the first available one */
if (ret)
ret = uclass_get_device(UCLASS_BOOTCOUNT, 0, &dev);
if (dev)
ret = dm_bootcount_get(dev, &val);
if (ret)
pr_debug("%s: failed to load bootcount\n", __func__);
/* Return the 0, if the call to dm_bootcount_get failed */
return ret ? 0 : val;
}
UCLASS_DRIVER(bootcount) = {
.name = "bootcount",
.id = UCLASS_BOOTCOUNT,
};