1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (c) 2020 Western Digital Corporation or its affiliates
7 #define LOG_CATEGORY LOGC_ARCH
10 #include <fdt_support.h>
13 #include <asm/global_data.h>
15 DECLARE_GLOBAL_DATA_PTR;
18 * riscv_fdt_copy_resv_mem_node() - Copy reserve memory node entry
19 * @src: Pointer to the source device tree from which reserved memory node
21 * @dst: Pointer to the destination device tree to which reserved memory node
24 * Return: 0 on success or if source doesn't have reserved memory node.
25 * Error if copy process failed.
27 int riscv_fdt_copy_resv_mem_node(const void *src, void *dst)
30 struct fdt_memory pmp_mem;
33 int offset, node, err, rmem_offset;
35 char basename[32] = {0};
37 int max_len = sizeof(basename);
41 offset = fdt_path_offset(src, "/reserved-memory");
43 log_debug("No reserved memory region found in source FDT\n");
48 * Extend the FDT by the following estimated size:
50 * Each PMP memory region entry occupies 64 bytes.
51 * With 16 PMP memory regions we need 64 * 16 = 1024 bytes.
53 err = fdt_open_into(dst, dst, fdt_totalsize(dst) + 1024);
55 printf("Device Tree can't be expanded to accommodate new node");
59 fdt_for_each_subnode(node, src, offset) {
60 name = fdt_get_name(src, node, NULL);
62 addr = fdtdec_get_addr_size_auto_parent(src, offset, node,
65 if (addr == FDT_ADDR_T_NONE) {
66 log_debug("failed to read address/size for %s\n", name);
69 strncpy(basename, name, max_len);
70 temp = strchr(basename, '@');
72 bname_len = strnlen(basename, max_len) - strnlen(temp,
74 *(basename + bname_len) = '\0';
77 pmp_mem.end = addr + size - 1;
78 err = fdtdec_add_reserved_memory(dst, basename, &pmp_mem,
80 if (err < 0 && err != -FDT_ERR_EXISTS) {
81 log_err("failed to add reserved memory: %d\n", err);
84 if (!fdt_getprop(src, node, "no-map", NULL))
87 rmem_offset = fdt_node_offset_by_phandle(dst, phandle);
88 fdt_setprop_empty(dst, rmem_offset, "no-map");
96 * riscv_board_reserved_mem_fixup() - Fix up reserved memory node for a board
97 * @fdt: Pointer to the device tree in which reserved memory node needs to be
100 * In RISC-V, any board needs to copy the reserved memory node from the device
101 * tree provided by the firmware to the device tree used by U-Boot. This is a
102 * common function that individual board fixup functions can invoke.
104 * Return: 0 on success or error otherwise.
106 int riscv_board_reserved_mem_fixup(void *fdt)
111 src_fdt_addr = map_sysmem(gd->arch.firmware_fdt_addr, 0);
113 /* avoid the copy if we are using the same device tree */
114 if (src_fdt_addr == fdt)
117 err = riscv_fdt_copy_resv_mem_node(src_fdt_addr, fdt);
124 #ifdef CONFIG_OF_BOARD_FIXUP
125 int board_fix_fdt(void *fdt)
129 err = riscv_board_reserved_mem_fixup(fdt);
131 log_err("failed to fixup DT for reserved memory: %d\n", err);
139 int arch_fixup_fdt(void *blob)
142 #ifdef CONFIG_EFI_LOADER
146 size = fdt_totalsize(blob);
147 err = fdt_open_into(blob, blob, size + 32);
149 log_err("Device Tree can't be expanded to accommodate new node");
152 chosen_offset = fdt_path_offset(blob, "/chosen");
153 if (chosen_offset < 0) {
154 err = fdt_add_subnode(blob, 0, "chosen");
156 log_err("chosen node cannot be added\n");
160 /* Overwrite the boot-hartid as U-Boot is the last stage BL */
161 fdt_setprop_u32(blob, chosen_offset, "boot-hartid", gd->arch.boot_hart);
164 /* Copy the reserved-memory node to the DT used by OS */
165 err = riscv_fdt_copy_resv_mem_node(gd->fdt_blob, blob);