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ebb73de168
The original bootcount methods do not provide an interface to DM and rely on a static configuration for I2C devices (e.g. bus, chip-addr, etc. are configured through defines statically). On a modern system that exposes multiple devices in a DTS-configurable way, this is less than optimal and a interface to DM-based devices will be desirable. This adds a simple driver that is DM-aware and configurable via DTS. If ambiguous (i.e. multiple bootcount-devices are present) the /chosen/u-boot,bootcount-device property can be used to select one bootcount device. Initially, this provides support for the following DM devices: * RTC devices Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com> Tested-by: Klaus Goger <klaus.goger@theobroma-systems.com>
94 lines
2.2 KiB
C
94 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2018 Theobroma Systems Design und Consulting GmbH
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*/
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#include <common.h>
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#include <dm.h>
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#include <errno.h>
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#include <bootcount.h>
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int dm_bootcount_get(struct udevice *dev, u32 *bootcount)
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{
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struct bootcount_ops *ops = bootcount_get_ops(dev);
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assert(ops);
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if (!ops->get)
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return -ENOSYS;
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return ops->get(dev, bootcount);
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}
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int dm_bootcount_set(struct udevice *dev, const u32 bootcount)
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{
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struct bootcount_ops *ops = bootcount_get_ops(dev);
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assert(ops);
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if (!ops->set)
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return -ENOSYS;
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return ops->set(dev, bootcount);
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}
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/* Now implement the generic default functions */
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void bootcount_store(ulong val)
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{
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struct udevice *dev = NULL;
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ofnode node;
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const char *propname = "u-boot,bootcount-device";
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int ret = -ENODEV;
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/*
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* If there's a preferred bootcount device selected by the user (by
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* setting '/chosen/u-boot,bootcount-device' in the DTS), try to use
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* it if available.
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*/
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node = ofnode_get_chosen_node(propname);
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if (ofnode_valid(node))
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ret = uclass_get_device_by_ofnode(UCLASS_BOOTCOUNT, node, &dev);
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/* If there was no user-selected device, use the first available one */
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if (ret)
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ret = uclass_get_device(UCLASS_BOOTCOUNT, 0, &dev);
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if (dev)
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ret = dm_bootcount_set(dev, val);
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if (ret)
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pr_debug("%s: failed to store 0x%lx\n", __func__, val);
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}
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ulong bootcount_load(void)
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{
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struct udevice *dev = NULL;
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ofnode node;
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const char *propname = "u-boot,bootcount-device";
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int ret = -ENODEV;
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u32 val;
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/*
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* If there's a preferred bootcount device selected by the user (by
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* setting '/chosen/u-boot,bootcount-device' in the DTS), try to use
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* it if available.
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*/
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node = ofnode_get_chosen_node(propname);
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if (ofnode_valid(node))
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ret = uclass_get_device_by_ofnode(UCLASS_BOOTCOUNT, node, &dev);
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/* If there was no user-selected device, use the first available one */
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if (ret)
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ret = uclass_get_device(UCLASS_BOOTCOUNT, 0, &dev);
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if (dev)
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ret = dm_bootcount_get(dev, &val);
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if (ret)
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pr_debug("%s: failed to load bootcount\n", __func__);
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/* Return the 0, if the call to dm_bootcount_get failed */
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return ret ? 0 : val;
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}
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UCLASS_DRIVER(bootcount) = {
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.name = "bootcount",
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.id = UCLASS_BOOTCOUNT,
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};
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