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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2020 Western Digital Corporation or its affiliates
*
*/
#define LOG_CATEGORY LOGC_ARCH
#include <common.h>
#include <fdt_support.h>
#include <log.h>
#include <mapmem.h>
DECLARE_GLOBAL_DATA_PTR;
/**
* riscv_fdt_copy_resv_mem_node() - Copy reserve memory node entry
* @src: Pointer to the source device tree from which reserved memory node
* needs to be copied.
* @dst: Pointer to the destination device tree to which reserved memory node
* needs to be copied.
*
* Return: 0 on success or if source doesn't have reserved memory node.
* Error if copy process failed.
*/
int riscv_fdt_copy_resv_mem_node(const void *src, void *dst)
{
u32 phandle;
struct fdt_memory pmp_mem;
fdt_addr_t addr;
fdt_size_t size;
int offset, node, err, rmem_offset;
bool nomap = true;
char basename[32] = {0};
int bname_len;
int max_len = sizeof(basename);
const char *name;
char *temp;
offset = fdt_path_offset(src, "/reserved-memory");
if (offset < 0) {
log_debug("No reserved memory region found in source FDT\n");
return 0;
}
/*
* Extend the FDT by the following estimated size:
*
* Each PMP memory region entry occupies 64 bytes.
* With 16 PMP memory regions we need 64 * 16 = 1024 bytes.
*/
err = fdt_open_into(dst, dst, fdt_totalsize(dst) + 1024);
if (err < 0) {
printf("Device Tree can't be expanded to accommodate new node");
return err;
}
fdt_for_each_subnode(node, src, offset) {
name = fdt_get_name(src, node, NULL);
addr = fdtdec_get_addr_size_auto_parent(src, offset, node,
"reg", 0, &size,
false);
if (addr == FDT_ADDR_T_NONE) {
log_debug("failed to read address/size for %s\n", name);
continue;
}
strncpy(basename, name, max_len);
temp = strchr(basename, '@');
if (temp) {
bname_len = strnlen(basename, max_len) - strnlen(temp,
max_len);
*(basename + bname_len) = '\0';
}
pmp_mem.start = addr;
pmp_mem.end = addr + size - 1;
err = fdtdec_add_reserved_memory(dst, basename, &pmp_mem,
&phandle);
if (err < 0 && err != -FDT_ERR_EXISTS) {
log_err("failed to add reserved memory: %d\n", err);
return err;
}
if (!fdt_getprop(src, node, "no-map", NULL))
nomap = false;
if (nomap) {
rmem_offset = fdt_node_offset_by_phandle(dst, phandle);
fdt_setprop_empty(dst, rmem_offset, "no-map");
}
}
return 0;
}
/**
* riscv_board_reserved_mem_fixup() - Fix up reserved memory node for a board
* @fdt: Pointer to the device tree in which reserved memory node needs to be
* added.
*
* In RISC-V, any board needs to copy the reserved memory node from the device
* tree provided by the firmware to the device tree used by U-Boot. This is a
* common function that individual board fixup functions can invoke.
*
* Return: 0 on success or error otherwise.
*/
int riscv_board_reserved_mem_fixup(void *fdt)
{
int err;
void *src_fdt_addr;
src_fdt_addr = map_sysmem(gd->arch.firmware_fdt_addr, 0);
/* avoid the copy if we are using the same device tree */
if (src_fdt_addr == fdt)
return 0;
err = riscv_fdt_copy_resv_mem_node(src_fdt_addr, fdt);
if (err < 0)
return err;
return 0;
}
#ifdef CONFIG_OF_BOARD_FIXUP
int board_fix_fdt(void *fdt)
{
int err;
err = riscv_board_reserved_mem_fixup(fdt);
if (err < 0) {
log_err("failed to fixup DT for reserved memory: %d\n", err);
return err;
}
return 0;
}
#endif
int arch_fixup_fdt(void *blob)
{
int err;
#ifdef CONFIG_EFI_LOADER
u32 size;
int chosen_offset;
size = fdt_totalsize(blob);
err = fdt_open_into(blob, blob, size + 32);
if (err < 0) {
log_err("Device Tree can't be expanded to accommodate new node");
return err;
}
chosen_offset = fdt_path_offset(blob, "/chosen");
if (chosen_offset < 0) {
err = fdt_add_subnode(blob, 0, "chosen");
if (err < 0) {
log_err("chosen node cannot be added\n");
return err;
}
}
/* Overwrite the boot-hartid as U-Boot is the last stage BL */
fdt_setprop_u32(blob, chosen_offset, "boot-hartid", gd->arch.boot_hart);
#endif
/* Copy the reserved-memory node to the DT used by OS */
err = riscv_fdt_copy_resv_mem_node(gd->fdt_blob, blob);
if (err < 0)
return err;
return 0;
}
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