device/pci: Declare pcidev_path_on_bus()
It is recommended to never reference PCI busses
using a static number. There is exception with
OPROM execution, where we want to translate the
bus number captured from the actual IO operation
into a matching device node in the devicetree.
Change-Id: I733c645ac5581c000b4cd6cdc05829cd039324d5
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34077
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
diff --git a/src/device/device_const.c b/src/device/device_const.c
index 1853b4c..c1b0b06 100644
--- a/src/device/device_const.c
+++ b/src/device/device_const.c
@@ -183,6 +183,24 @@
return find_dev_path(parent, &path);
}
+DEVTREE_CONST struct device *pcidev_path_on_bus(unsigned int bus, pci_devfn_t devfn)
+{
+ DEVTREE_CONST struct bus *parent = pci_root_bus();
+ DEVTREE_CONST struct device *dev = parent->children;
+
+ /* FIXME: Write the loop with topology links. */
+ while (dev) {
+ if (dev->path.type != DEVICE_PATH_PCI) {
+ dev = dev->next;
+ continue;
+ }
+ if (dev->bus->secondary == bus)
+ return pcidev_path_behind(dev->bus, devfn);
+ dev = dev->next;
+ }
+ return NULL;
+}
+
DEVTREE_CONST struct bus *pci_root_bus(void)
{
DEVTREE_CONST struct device *pci_domain;