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ebb73de1 PT |
1 | // SPDX-License-Identifier: GPL-2.0+ |
2 | /* | |
3 | * (C) Copyright 2018 Theobroma Systems Design und Consulting GmbH | |
4 | */ | |
5 | ||
6 | #include <common.h> | |
7 | #include <dm.h> | |
8 | #include <errno.h> | |
9 | #include <bootcount.h> | |
f7ae49fc | 10 | #include <log.h> |
ebb73de1 PT |
11 | |
12 | int dm_bootcount_get(struct udevice *dev, u32 *bootcount) | |
13 | { | |
14 | struct bootcount_ops *ops = bootcount_get_ops(dev); | |
15 | ||
16 | assert(ops); | |
17 | if (!ops->get) | |
18 | return -ENOSYS; | |
19 | return ops->get(dev, bootcount); | |
20 | } | |
21 | ||
22 | int dm_bootcount_set(struct udevice *dev, const u32 bootcount) | |
23 | { | |
24 | struct bootcount_ops *ops = bootcount_get_ops(dev); | |
25 | ||
26 | assert(ops); | |
27 | if (!ops->set) | |
28 | return -ENOSYS; | |
29 | return ops->set(dev, bootcount); | |
30 | } | |
31 | ||
32 | /* Now implement the generic default functions */ | |
33 | void bootcount_store(ulong val) | |
34 | { | |
35 | struct udevice *dev = NULL; | |
36 | ofnode node; | |
37 | const char *propname = "u-boot,bootcount-device"; | |
38 | int ret = -ENODEV; | |
39 | ||
40 | /* | |
41 | * If there's a preferred bootcount device selected by the user (by | |
42 | * setting '/chosen/u-boot,bootcount-device' in the DTS), try to use | |
43 | * it if available. | |
44 | */ | |
45 | node = ofnode_get_chosen_node(propname); | |
46 | if (ofnode_valid(node)) | |
47 | ret = uclass_get_device_by_ofnode(UCLASS_BOOTCOUNT, node, &dev); | |
48 | ||
49 | /* If there was no user-selected device, use the first available one */ | |
50 | if (ret) | |
51 | ret = uclass_get_device(UCLASS_BOOTCOUNT, 0, &dev); | |
52 | ||
53 | if (dev) | |
54 | ret = dm_bootcount_set(dev, val); | |
55 | ||
56 | if (ret) | |
57 | pr_debug("%s: failed to store 0x%lx\n", __func__, val); | |
58 | } | |
59 | ||
60 | ulong bootcount_load(void) | |
61 | { | |
62 | struct udevice *dev = NULL; | |
63 | ofnode node; | |
64 | const char *propname = "u-boot,bootcount-device"; | |
65 | int ret = -ENODEV; | |
66 | u32 val; | |
67 | ||
68 | /* | |
69 | * If there's a preferred bootcount device selected by the user (by | |
70 | * setting '/chosen/u-boot,bootcount-device' in the DTS), try to use | |
71 | * it if available. | |
72 | */ | |
73 | node = ofnode_get_chosen_node(propname); | |
74 | if (ofnode_valid(node)) | |
75 | ret = uclass_get_device_by_ofnode(UCLASS_BOOTCOUNT, node, &dev); | |
76 | ||
77 | /* If there was no user-selected device, use the first available one */ | |
78 | if (ret) | |
79 | ret = uclass_get_device(UCLASS_BOOTCOUNT, 0, &dev); | |
80 | ||
81 | if (dev) | |
82 | ret = dm_bootcount_get(dev, &val); | |
83 | ||
84 | if (ret) | |
85 | pr_debug("%s: failed to load bootcount\n", __func__); | |
86 | ||
87 | /* Return the 0, if the call to dm_bootcount_get failed */ | |
88 | return ret ? 0 : val; | |
89 | } | |
90 | ||
91 | UCLASS_DRIVER(bootcount) = { | |
92 | .name = "bootcount", | |
93 | .id = UCLASS_BOOTCOUNT, | |
94 | }; |