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lib: utils: Implement "ranges" property parsing

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The "reg" property in a device node may not be the correct address always.
If a parent node defines a "ranges" property, the child address need to be
translated with respect to parents address. If the ranges property is not
present, it will just use 1:1 translation.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
This commit is contained in:
Atish Patra
2020-10-23 15:47:39 -07:00
committed by Anup Patel
parent fdf5d5c322
commit 74c0ea1e83
1 changed files with 48 additions and 2 deletions
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50
lib/utils/fdt/fdt_helper.c
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@@ -71,10 +71,48 @@ int fdt_find_match(void *fdt, int startoff,
return SBI_ENODEV;
}
static int fdt_translate_address(void *fdt, uint64_t reg, int parent,
unsigned long *addr)
{
int i, rlen;
int cell_addr, cell_size;
const fdt32_t *ranges;
uint64_t offset = 0, 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++)
caddr = (caddr << 32) | fdt32_to_cpu(*ranges++);
for (i = 0; i < cell_addr; i++)
paddr = (paddr << 32) | fdt32_to_cpu(*ranges++);
for (i = 0; i < cell_size; i++)
rsize = (rsize << 32) | fdt32_to_cpu(*ranges++);
if (reg < caddr || caddr >= (reg + rsize )) {
sbi_printf("invalid address translation\n");
return SBI_ENODEV;
}
offset = reg - caddr;
*addr = paddr + offset;
} else {
/* No translation required */
*addr = reg;
}
return 0;
}
int fdt_get_node_addr_size(void *fdt, int node, unsigned long *addr,
unsigned long *size)
{
int parent, len, i;
int parent, len, i, rc;
int cell_addr, cell_size;
const fdt32_t *prop_addr, *prop_size;
uint64_t temp = 0;
@@ -98,7 +136,15 @@ int fdt_get_node_addr_size(void *fdt, int node, unsigned long *addr,
if (addr) {
for (i = 0; i < cell_addr; i++)
temp = (temp << 32) | fdt32_to_cpu(*prop_addr++);
*addr = temp;
do {
if (parent < 0)
break;
rc = fdt_translate_address(fdt, temp, parent, addr);
if (rc)
break;
parent = fdt_parent_offset(fdt, parent);
temp = *addr;
} while (1);
}
temp = 0;