1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (c) 2020 Western Digital Corporation or its affiliates
8 #include <fdt_support.h>
12 DECLARE_GLOBAL_DATA_PTR;
15 * riscv_fdt_copy_resv_mem_node() - Copy reserve memory node entry
16 * @src: Pointer to the source device tree from which reserved memory node
18 * @dst: Pointer to the destination device tree to which reserved memory node
21 * Return: 0 on success or if source doesn't have reserved memory node.
22 * Error if copy process failed.
24 int riscv_fdt_copy_resv_mem_node(const void *src, void *dst)
27 struct fdt_memory pmp_mem;
30 int offset, node, err, rmem_offset;
32 char basename[32] = {0};
34 int max_len = sizeof(basename);
38 offset = fdt_path_offset(src, "/reserved-memory");
40 printf("No reserved memory region found in source FDT\n");
44 fdt_for_each_subnode(node, src, offset) {
45 name = fdt_get_name(src, node, NULL);
47 addr = fdtdec_get_addr_size_auto_noparent(src, node,
50 if (addr == FDT_ADDR_T_NONE) {
51 debug("failed to read address/size for %s\n", name);
54 strncpy(basename, name, max_len);
55 temp = strchr(basename, '@');
57 bname_len = strnlen(basename, max_len) - strnlen(temp,
59 *(basename + bname_len) = '\0';
62 pmp_mem.end = addr + size - 1;
63 err = fdtdec_add_reserved_memory(dst, basename, &pmp_mem,
66 printf("failed to add reserved memory: %d\n", err);
69 if (!fdt_getprop(src, node, "no-map", NULL))
72 rmem_offset = fdt_node_offset_by_phandle(dst, phandle);
73 fdt_setprop_empty(dst, rmem_offset, "no-map");
81 * riscv_board_reserved_mem_fixup() - Fix up reserved memory node for a board
82 * @fdt: Pointer to the device tree in which reserved memory node needs to be
85 * In RISC-V, any board compiled with OF_SEPARATE needs to copy the reserved
86 * memory node from the device tree provided by the firmware to the device tree
87 * used by U-Boot. This is a common function that individual board fixup
88 * functions can invoke.
90 * Return: 0 on success or error otherwise.
92 int riscv_board_reserved_mem_fixup(void *fdt)
97 src_fdt_addr = map_sysmem(gd->arch.firmware_fdt_addr, 0);
98 err = riscv_fdt_copy_resv_mem_node(src_fdt_addr, fdt);
105 #ifdef CONFIG_OF_BOARD_FIXUP
106 int board_fix_fdt(void *fdt)
110 err = riscv_board_reserved_mem_fixup(fdt);
112 printf("failed to fixup DT for reserved memory: %d\n", err);
120 int arch_fixup_fdt(void *blob)
123 #ifdef CONFIG_EFI_LOADER
127 size = fdt_totalsize(blob);
128 err = fdt_open_into(blob, blob, size + 32);
130 printf("Device Tree can't be expanded to accommodate new node");
133 chosen_offset = fdt_path_offset(blob, "/chosen");
134 if (chosen_offset < 0) {
135 err = fdt_add_subnode(blob, 0, "chosen");
137 printf("chosen node can not be added\n");
141 /* Overwrite the boot-hartid as U-Boot is the last stage BL */
142 fdt_setprop_u32(blob, chosen_offset, "boot-hartid", gd->arch.boot_hart);
145 /* Copy the reserved-memory node to the DT used by OS */
146 err = riscv_fdt_copy_resv_mem_node(gd->fdt_blob, blob);