1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
4  */
5 
6 #include <common.h>
7 #include <dm.h>
8 #include <fdtdec.h>
9 #include <virtio_types.h>
10 #include <virtio.h>
11 
12 int board_init(void)
13 {
14 	/*
15 	 * Make sure virtio bus is enumerated so that peripherals
16 	 * on the virtio bus can be discovered by their drivers
17 	 */
18 	virtio_init();
19 
20 	return 0;
21 }
22 
23 int board_late_init(void)
24 {
25 	ulong kernel_start;
26 	ofnode chosen_node;
27 	int ret;
28 
29 	chosen_node = ofnode_path("/chosen");
30 	if (!ofnode_valid(chosen_node)) {
31 		debug("No chosen node found, can't get kernel start address\n");
32 		return 0;
33 	}
34 
35 #ifdef CONFIG_ARCH_RV64I
36 	ret = ofnode_read_u64(chosen_node, "riscv,kernel-start",
37 			      (u64 *)&kernel_start);
38 #else
39 	ret = ofnode_read_u32(chosen_node, "riscv,kernel-start",
40 			      (u32 *)&kernel_start);
41 #endif
42 	if (ret) {
43 		debug("Can't find kernel start address in device tree\n");
44 		return 0;
45 	}
46 
47 	env_set_hex("kernel_start", kernel_start);
48 
49 	return 0;
50 }
51 
52 /*
53  * QEMU specifies the location of Linux (supplied with the -kernel argument)
54  * in the device tree using the riscv,kernel-start and riscv,kernel-end
55  * properties. We currently rely on the SBI implementation of BBL to run
56  * Linux and therefore embed Linux as payload in BBL. This causes an issue,
57  * because BBL detects the kernel properties in the device tree and ignores
58  * the Linux payload as a result. To work around this issue, we clear the
59  * kernel properties before booting Linux.
60  *
61  * This workaround can be removed, once we do not require BBL for its SBI
62  * implementation anymore.
63  */
64 int ft_board_setup(void *blob, bd_t *bd)
65 {
66 	int chosen_offset, ret;
67 
68 	chosen_offset = fdt_path_offset(blob, "/chosen");
69 	if (chosen_offset < 0)
70 		return 0;
71 
72 #ifdef CONFIG_ARCH_RV64I
73 	ret = fdt_setprop_u64(blob, chosen_offset, "riscv,kernel-start", 0);
74 #else
75 	ret = fdt_setprop_u32(blob, chosen_offset, "riscv,kernel-start", 0);
76 #endif
77 	if (ret)
78 		return ret;
79 
80 #ifdef CONFIG_ARCH_RV64I
81 	ret = fdt_setprop_u64(blob, chosen_offset, "riscv,kernel-end", 0);
82 #else
83 	ret = fdt_setprop_u32(blob, chosen_offset, "riscv,kernel-end", 0);
84 #endif
85 	if (ret)
86 		return ret;
87 
88 	return 0;
89 }
90