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lib: utils: fdt: fix "ranges" translation

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According to the Device Tree Spec, Chapter 2.3.8 "ranges" [1]:
The parent address size will be determined from the #address-cells
property of the node that defines the parent’s address space.

In fdt_translate_address(), which considered the parent address size
is the child address size, this commit fix the two address sizes
and parsing the address independently.

Signed-off-by: Max Hsu <max.hsu@sifive.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20250711-dev-maxh-master_fdt_helper-v2-1-9579e1f02ee1@sifive.com
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Max Hsu
2025-07-11 00:12:53 +08:00
committed by Anup Patel
parent cc546e1a06
commit 84044ee83c
1 changed files with 15 additions and 11 deletions
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26
lib/utils/fdt/fdt_helper.c
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@@ -84,23 +84,27 @@ static int fdt_translate_address(const void *fdt, uint64_t reg, int parent,
uint64_t *addr)
{
int i, rlen;
int cell_addr, cell_size;
int cell_parent_addr, cell_child_addr, cell_size;
const fdt32_t *ranges;
uint64_t offset, caddr = 0, paddr = 0, rsize = 0;
cell_addr = fdt_address_cells(fdt, parent);
if (cell_addr < 1)
return SBI_ENODEV;
cell_size = fdt_size_cells(fdt, parent);
if (cell_size < 0)
return SBI_ENODEV;
ranges = fdt_getprop(fdt, parent, "ranges", &rlen);
if (ranges && rlen > 0) {
for (i = 0; i < cell_addr; i++)
cell_child_addr = fdt_address_cells(fdt, parent);
if (cell_child_addr < 1)
return SBI_ENODEV;
cell_parent_addr = fdt_address_cells(fdt, fdt_parent_offset(fdt, parent));
if (cell_parent_addr < 1)
return SBI_ENODEV;
cell_size = fdt_size_cells(fdt, parent);
if (cell_size < 0)
return SBI_ENODEV;
for (i = 0; i < cell_child_addr; i++)
caddr = (caddr << 32) | fdt32_to_cpu(*ranges++);
for (i = 0; i < cell_addr; i++)
for (i = 0; i < cell_parent_addr; i++)
paddr = (paddr << 32) | fdt32_to_cpu(*ranges++);
for (i = 0; i < cell_size; i++)
rsize = (rsize << 32) | fdt32_to_cpu(*ranges++);