1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Verified Boot for Embedded (VBE) loading firmware phases
4 *
5 * Copyright 2022 Google LLC
6 * Written by Simon Glass <sjg@chromium.org>
7 */
8
9 #define LOG_CATEGORY LOGC_BOOT
10
11 #include <common.h>
12 #include <dm.h>
13 #include <bootflow.h>
14 #include <vbe.h>
15 #include <version_string.h>
16 #include <dm/device-internal.h>
17 #include "vbe_simple.h"
18
vbe_simple_fixup_node(ofnode node,struct simple_state * state)19 int vbe_simple_fixup_node(ofnode node, struct simple_state *state)
20 {
21 const char *version, *str;
22 int ret;
23
24 version = strdup(state->fw_version);
25 if (!version)
26 return log_msg_ret("dup", -ENOMEM);
27
28 ret = ofnode_write_string(node, "cur-version", version);
29 if (ret)
30 return log_msg_ret("ver", ret);
31 ret = ofnode_write_u32(node, "cur-vernum", state->fw_vernum);
32 if (ret)
33 return log_msg_ret("num", ret);
34
35 /* Drop the 'U-Boot ' at the start */
36 str = version_string;
37 if (!strncmp("U-Boot ", str, 7))
38 str += 7;
39 ret = ofnode_write_string(node, "bootloader-version", str);
40 if (ret)
41 return log_msg_ret("bl", ret);
42
43 return 0;
44 }
45
46 /**
47 * bootmeth_vbe_simple_ft_fixup() - Write out all VBE simple data to the DT
48 *
49 * @ctx: Context for event
50 * @event: Event to process
51 * @return 0 if OK, -ve on error
52 */
bootmeth_vbe_simple_ft_fixup(void * ctx,struct event * event)53 static int bootmeth_vbe_simple_ft_fixup(void *ctx, struct event *event)
54 {
55 oftree tree = event->data.ft_fixup.tree;
56 struct udevice *dev;
57
58 /*
59 * Ideally we would have driver model support for fixups, but that does
60 * not exist yet. It is a step too far to try to do this before VBE is
61 * in place.
62 */
63 for (vbe_find_first_device(&dev); dev; vbe_find_next_device(&dev)) {
64 struct simple_state state;
65 ofnode node, subnode, chosen;
66 int ret;
67
68 if (strcmp("vbe_simple", dev->driver->name))
69 continue;
70
71 /* Check if there is a node to fix up, adding if not */
72 chosen = oftree_path(tree, "/chosen");
73 if (!ofnode_valid(chosen))
74 continue;
75
76 ret = device_probe(dev);
77 if (ret) {
78 /*
79 * This should become an error when VBE is updated to
80 * only bind this device when a node exists
81 */
82 log_debug("VBE device '%s' failed to probe (err=%d)",
83 dev->name, ret);
84 return 0;
85 }
86
87 ret = ofnode_add_subnode(chosen, "fwupd", &node);
88 if (ret && ret != -EEXIST)
89 return log_msg_ret("fwu", ret);
90
91 ret = ofnode_add_subnode(node, dev->name, &subnode);
92 if (ret && ret != -EEXIST)
93 return log_msg_ret("dev", ret);
94
95 /* Copy over the vbe properties for fwupd */
96 log_debug("Fixing up: %s\n", dev->name);
97 ret = ofnode_copy_props(dev_ofnode(dev), subnode);
98 if (ret)
99 return log_msg_ret("cp", ret);
100
101 ret = vbe_simple_read_state(dev, &state);
102 if (ret)
103 return log_msg_ret("read", ret);
104
105 ret = vbe_simple_fixup_node(subnode, &state);
106 if (ret)
107 return log_msg_ret("fix", ret);
108 }
109
110 return 0;
111 }
112 EVENT_SPY(EVT_FT_FIXUP, bootmeth_vbe_simple_ft_fixup);
113