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