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Diffstat (limited to 'src/device/pci_device.c')
-rw-r--r--src/device/pci_device.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/src/device/pci_device.c b/src/device/pci_device.c
index fda088b020..44c47a7548 100644
--- a/src/device/pci_device.c
+++ b/src/device/pci_device.c
@@ -6,6 +6,7 @@
*/
#include <acpi/acpi.h>
+#include <assert.h>
#include <device/pci_ops.h>
#include <bootmode.h>
#include <console/console.h>
@@ -1299,6 +1300,29 @@ unsigned int pci_match_simple_dev(struct device *dev, pci_devfn_t sdev)
}
/**
+ * Test whether a capability is available along the whole path from the given
+ * device to the host bridge.
+ *
+ * @param dev Pointer to the device structure.
+ * @param cap PCI_CAP_LIST_ID of the PCI capability we're looking for.
+ * @return The next matching capability of the given device, if it is available
+ * along the whole path, or zero if not.
+ */
+uint16_t pci_find_cap_recursive(const struct device *dev, uint16_t cap)
+{
+ assert(dev->bus);
+ uint16_t pos = pci_find_capability(dev, cap);
+ const struct device *bridge = dev->bus->dev;
+ while (bridge && (bridge->path.type == DEVICE_PATH_PCI)) {
+ assert(bridge->bus);
+ if (!pci_find_capability(bridge, cap))
+ return 0;
+ bridge = bridge->bus->dev;
+ }
+ return pos;
+}
+
+/**
* PCI devices that are marked as "hidden" do not get probed. However, the same
* initialization logic is still performed as if it were. This is useful when
* devices would like to be described in the devicetree.cb file, and/or present