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kboot: Add u-boot,dm-pre-reloc properties

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These properties are needed such that U-Boot can enable the
serial port in its early pre-relocation phase.

Signed-off-by: Mark Kettenis <kettenis@openbsd.org>
This commit is contained in:
Mark Kettenis 2022-01-17 20:29:04 +01:00 committed by Hector Martin
parent 2bd7bf4020
commit 30d6c6374d
1 changed files with 55 additions and 0 deletions
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55
src/kboot.c
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@ -327,6 +327,59 @@ static int dt_set_wifi(void)
return 0;
}
static void dt_set_uboot_dm_preloc(int node)
{
// Tell U-Boot to bind this node early
fdt_setprop_empty(dt, node, "u-boot,dm-pre-reloc");
// Make sure the power domains are bound early as well
int pds_size;
const fdt32_t *pds = fdt_getprop(dt, node, "power-domains", &pds_size);
if (!pds)
return;
fdt32_t *phandles = malloc(pds_size);
if (!phandles) {
printf("FDT: out of memory\n");
return;
}
memcpy(phandles, pds, pds_size);
for (int i = 0; i < pds_size / 4; i++) {
node = fdt_node_offset_by_phandle(dt, fdt32_ld(&phandles[i]));
if (node < 0)
continue;
dt_set_uboot_dm_preloc(node);
// And make sure the PMGR node is bound early too
node = fdt_parent_offset(dt, node);
if (node < 0)
continue;
dt_set_uboot_dm_preloc(node);
}
free(phandles);
}
static int dt_set_uboot(void)
{
// Make sure that U-Boot can initialize the serial port in its
// pre-relocation phase by marking its node and the nodes of the
// power domains it depends on with a "u-boot,dm-pre-reloc"
// property.
const char *path = fdt_get_alias(dt, "serial0");
if (path == NULL)
return 0;
int node = fdt_path_offset(dt, path);
if (node < 0)
return 0;
dt_set_uboot_dm_preloc(node);
return 0;
}
static int dt_disable_missing_devs(const char *adt_prefix, const char *dt_prefix, int max_devs)
{
int ret = -1;
@ -487,6 +540,8 @@ int kboot_prepare_dt(void *fdt)
return -1;
if (dt_set_wifi())
return -1;
if (dt_set_uboot())
return -1;
if (dt_disable_missing_devs("usb-drd", "usb@", 8))
return -1;
if (dt_disable_missing_devs("i2c", "i2c@", 8))