| Philipp Tomsich | ebb73de | 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 | |
| 6 | #include <common.h> |
| 7 | #include <dm.h> |
| 8 | #include <errno.h> |
| 9 | #include <bootcount.h> |
| 10 | |
| 11 | int dm_bootcount_get(struct udevice *dev, u32 *bootcount) |
| 12 | { |
| 13 | struct bootcount_ops *ops = bootcount_get_ops(dev); |
| 14 | |
| 15 | assert(ops); |
| 16 | if (!ops->get) |
| 17 | return -ENOSYS; |
| 18 | return ops->get(dev, bootcount); |
| 19 | } |
| 20 | |
| 21 | int dm_bootcount_set(struct udevice *dev, const u32 bootcount) |
| 22 | { |
| 23 | struct bootcount_ops *ops = bootcount_get_ops(dev); |
| 24 | |
| 25 | assert(ops); |
| 26 | if (!ops->set) |
| 27 | return -ENOSYS; |
| 28 | return ops->set(dev, bootcount); |
| 29 | } |
| 30 | |
| 31 | /* Now implement the generic default functions */ |
| 32 | void bootcount_store(ulong val) |
| 33 | { |
| 34 | struct udevice *dev = NULL; |
| 35 | ofnode node; |
| 36 | const char *propname = "u-boot,bootcount-device"; |
| 37 | int ret = -ENODEV; |
| 38 | |
| 39 | /* |
| 40 | * If there's a preferred bootcount device selected by the user (by |
| 41 | * setting '/chosen/u-boot,bootcount-device' in the DTS), try to use |
| 42 | * it if available. |
| 43 | */ |
| 44 | node = ofnode_get_chosen_node(propname); |
| 45 | if (ofnode_valid(node)) |
| 46 | ret = uclass_get_device_by_ofnode(UCLASS_BOOTCOUNT, node, &dev); |
| 47 | |
| 48 | /* If there was no user-selected device, use the first available one */ |
| 49 | if (ret) |
| 50 | ret = uclass_get_device(UCLASS_BOOTCOUNT, 0, &dev); |
| 51 | |
| 52 | if (dev) |
| 53 | ret = dm_bootcount_set(dev, val); |
| 54 | |
| 55 | if (ret) |
| 56 | pr_debug("%s: failed to store 0x%lx\n", __func__, val); |
| 57 | } |
| 58 | |
| 59 | ulong bootcount_load(void) |
| 60 | { |
| 61 | struct udevice *dev = NULL; |
| 62 | ofnode node; |
| 63 | const char *propname = "u-boot,bootcount-device"; |
| 64 | int ret = -ENODEV; |
| 65 | u32 val; |
| 66 | |
| 67 | /* |
| 68 | * If there's a preferred bootcount device selected by the user (by |
| 69 | * setting '/chosen/u-boot,bootcount-device' in the DTS), try to use |
| 70 | * it if available. |
| 71 | */ |
| 72 | node = ofnode_get_chosen_node(propname); |
| 73 | if (ofnode_valid(node)) |
| 74 | ret = uclass_get_device_by_ofnode(UCLASS_BOOTCOUNT, node, &dev); |
| 75 | |
| 76 | /* If there was no user-selected device, use the first available one */ |
| 77 | if (ret) |
| 78 | ret = uclass_get_device(UCLASS_BOOTCOUNT, 0, &dev); |
| 79 | |
| 80 | if (dev) |
| 81 | ret = dm_bootcount_get(dev, &val); |
| 82 | |
| 83 | if (ret) |
| 84 | pr_debug("%s: failed to load bootcount\n", __func__); |
| 85 | |
| 86 | /* Return the 0, if the call to dm_bootcount_get failed */ |
| 87 | return ret ? 0 : val; |
| 88 | } |
| 89 | |
| 90 | UCLASS_DRIVER(bootcount) = { |
| 91 | .name = "bootcount", |
| 92 | .id = UCLASS_BOOTCOUNT, |
| 93 | }; |