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authorKyösti Mälkki <kyosti.malkki@gmail.com>2019-07-04 07:16:59 +0300
committerPatrick Georgi <pgeorgi@google.com>2019-07-12 08:52:50 +0000
commitab275f0915f2ba8abffed8f1384aa5353287c5ba (patch)
treef3f905967e412ec0db2add1f6863a8bbe1db92ba /src/device/device_const.c
parentc19d6a6ce59873f2326b14bb4af69048cceb9300 (diff)
downloadcoreboot-ab275f0915f2ba8abffed8f1384aa5353287c5ba.tar.xz
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>
Diffstat (limited to 'src/device/device_const.c')
-rw-r--r--src/device/device_const.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/src/device/device_const.c b/src/device/device_const.c
index 1853b4c4d2..c1b0b063ff 100644
--- a/src/device/device_const.c
+++ b/src/device/device_const.c
@@ -183,6 +183,24 @@ DEVTREE_CONST struct device *pcidev_path_behind(
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;