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
19int 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 */
53static 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(subnode, dev_ofnode(dev));
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}
112EVENT_SPY_FULL(EVT_FT_FIXUP, bootmeth_vbe_simple_ft_fixup);
113