| Philipp Tomsich | ce86031 | 2018-11-27 23:00:18 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0+ |
| 2 | /* |
| 3 | * (C) Copyright 2018 Theobroma Systems Design und Consulting GmbH |
| 4 | */ |
| 5 | |
| Patrick Delaunay | 8131335 | 2021-04-27 11:02:19 +0200 | [diff] [blame] | 6 | #define LOG_CATEGORY UCLASS_BOOTCOUNT |
| 7 | |
| Philipp Tomsich | ce86031 | 2018-11-27 23:00:18 +0100 | [diff] [blame] | 8 | #include <dm.h> |
| 9 | #include <errno.h> |
| 10 | #include <bootcount.h> |
| Simon Glass | 0f2af88 | 2020-05-10 11:40:05 -0600 | [diff] [blame] | 11 | #include <log.h> |
| Simon Glass | bdd5f81 | 2023-09-14 18:21:46 -0600 | [diff] [blame] | 12 | #include <linux/printk.h> |
| Philipp Tomsich | ce86031 | 2018-11-27 23:00:18 +0100 | [diff] [blame] | 13 | |
| 14 | int dm_bootcount_get(struct udevice *dev, u32 *bootcount) |
| 15 | { |
| 16 | struct bootcount_ops *ops = bootcount_get_ops(dev); |
| 17 | |
| 18 | assert(ops); |
| 19 | if (!ops->get) |
| 20 | return -ENOSYS; |
| 21 | return ops->get(dev, bootcount); |
| 22 | } |
| 23 | |
| 24 | int dm_bootcount_set(struct udevice *dev, const u32 bootcount) |
| 25 | { |
| 26 | struct bootcount_ops *ops = bootcount_get_ops(dev); |
| 27 | |
| 28 | assert(ops); |
| 29 | if (!ops->set) |
| 30 | return -ENOSYS; |
| 31 | return ops->set(dev, bootcount); |
| 32 | } |
| 33 | |
| 34 | /* Now implement the generic default functions */ |
| 35 | void bootcount_store(ulong val) |
| 36 | { |
| 37 | struct udevice *dev = NULL; |
| 38 | ofnode node; |
| 39 | const char *propname = "u-boot,bootcount-device"; |
| 40 | int ret = -ENODEV; |
| 41 | |
| 42 | /* |
| 43 | * If there's a preferred bootcount device selected by the user (by |
| 44 | * setting '/chosen/u-boot,bootcount-device' in the DTS), try to use |
| 45 | * it if available. |
| 46 | */ |
| 47 | node = ofnode_get_chosen_node(propname); |
| 48 | if (ofnode_valid(node)) |
| 49 | ret = uclass_get_device_by_ofnode(UCLASS_BOOTCOUNT, node, &dev); |
| 50 | |
| 51 | /* If there was no user-selected device, use the first available one */ |
| 52 | if (ret) |
| 53 | ret = uclass_get_device(UCLASS_BOOTCOUNT, 0, &dev); |
| 54 | |
| 55 | if (dev) |
| 56 | ret = dm_bootcount_set(dev, val); |
| 57 | |
| 58 | if (ret) |
| 59 | pr_debug("%s: failed to store 0x%lx\n", __func__, val); |
| 60 | } |
| 61 | |
| 62 | ulong bootcount_load(void) |
| 63 | { |
| 64 | struct udevice *dev = NULL; |
| 65 | ofnode node; |
| 66 | const char *propname = "u-boot,bootcount-device"; |
| 67 | int ret = -ENODEV; |
| 68 | u32 val; |
| 69 | |
| 70 | /* |
| 71 | * If there's a preferred bootcount device selected by the user (by |
| 72 | * setting '/chosen/u-boot,bootcount-device' in the DTS), try to use |
| 73 | * it if available. |
| 74 | */ |
| 75 | node = ofnode_get_chosen_node(propname); |
| 76 | if (ofnode_valid(node)) |
| 77 | ret = uclass_get_device_by_ofnode(UCLASS_BOOTCOUNT, node, &dev); |
| 78 | |
| 79 | /* If there was no user-selected device, use the first available one */ |
| 80 | if (ret) |
| 81 | ret = uclass_get_device(UCLASS_BOOTCOUNT, 0, &dev); |
| 82 | |
| 83 | if (dev) |
| 84 | ret = dm_bootcount_get(dev, &val); |
| 85 | |
| 86 | if (ret) |
| 87 | pr_debug("%s: failed to load bootcount\n", __func__); |
| 88 | |
| 89 | /* Return the 0, if the call to dm_bootcount_get failed */ |
| 90 | return ret ? 0 : val; |
| 91 | } |
| 92 | |
| 93 | UCLASS_DRIVER(bootcount) = { |
| 94 | .name = "bootcount", |
| 95 | .id = UCLASS_BOOTCOUNT, |
| 96 | }; |