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[dt] Locate parent node at point of use in dt_ioremap()

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We currently rely on the recursive nature of devicetree bus probing to
obtain the region cell size specification from the parent device.
This blocks the possibility of creating a standalone console device
based on /chosen/stdout-path before probing the whole bus.

Fix by using fdt_parent() to locate the parent device at the point of
use within dt_ioremap().

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2025-05-30 16:39:10 +01:00
parent 1762568ec5
commit bb2011241f
2 changed files with 15 additions and 12 deletions
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24
src/drivers/bus/devtree.c
View File

@@ -54,16 +54,25 @@ static void dt_remove_children ( struct dt_device *parent );
*/
void * dt_ioremap ( struct dt_device *dt, unsigned int offset,
unsigned int index, size_t len ) {
struct dt_device *parent =
container_of ( dt->dev.parent, struct dt_device, dev );
struct fdt_reg_cells *regs = &parent->regs;
struct fdt_reg_cells regs;
unsigned int parent;
uint64_t address;
uint64_t size;
void *io_addr;
int rc;
/* Get parent node */
if ( ( rc = fdt_parent ( &sysfdt, offset, &parent ) ) != 0 ) {
DBGC ( dt, "DT %s could not locate parent: %s\n",
dt->path, strerror ( rc ) );
return NULL;
}
/* Read #address-cells and #size-cells, if present */
fdt_reg_cells ( &sysfdt, parent, &regs );
/* Read address */
if ( ( rc = fdt_reg_address ( &sysfdt, offset, regs, index,
if ( ( rc = fdt_reg_address ( &sysfdt, offset, &regs, index,
&address ) ) != 0 ) {
DBGC ( dt, "DT %s could not read region %d address: %s\n",
dt->path, index, strerror ( rc ) );
@@ -72,8 +81,8 @@ void * dt_ioremap ( struct dt_device *dt, unsigned int offset,
/* Read size (or assume sufficient, if tree specifies no sizes) */
size = len;
if ( regs->size_cells &&
( ( rc = fdt_reg_size ( &sysfdt, offset, regs, index,
if ( regs.size_cells &&
( ( rc = fdt_reg_size ( &sysfdt, offset, &regs, index,
&size ) ) != 0 ) ) {
DBGC ( dt, "DT %s could not read region %d size: %s\n",
dt->path, index, strerror ( rc ) );
@@ -222,9 +231,6 @@ static int dt_probe_node ( struct dt_device *parent, unsigned int offset,
INIT_LIST_HEAD ( &dt->dev.children );
list_add_tail ( &dt->dev.siblings, &dt->dev.parent->children );
/* Read #address-cells and #size-cells, if present */
fdt_reg_cells ( &sysfdt, offset, &dt->regs );
/* Probe device */
if ( ( rc = dt_probe ( dt, offset ) ) != 0 )
goto err_probe;

3
src/include/ipxe/devtree.h
View File

@@ -25,9 +25,6 @@ struct dt_device {
struct dt_driver *driver;
/** Driver-private data */
void *priv;
/** Register cell size specification */
struct fdt_reg_cells regs;
};
/** A devicetree driver */