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-rw-r--r--src/device/pci_device.c13
-rw-r--r--src/include/device/pci.h1
-rw-r--r--src/include/device/pci_def.h4
3 files changed, 18 insertions, 0 deletions
diff --git a/src/device/pci_device.c b/src/device/pci_device.c
index 4c5a81451c..1d998ca780 100644
--- a/src/device/pci_device.c
+++ b/src/device/pci_device.c
@@ -1054,6 +1054,19 @@ device_t pci_probe_dev(device_t dev, struct bus *bus, unsigned devfn)
}
/**
+ * Test for match between romstage and ramstage device instance.
+ *
+ * @param dev Pointer to the device structure.
+ * @param sdev Simple device model identifier, created with PCI_DEV().
+ * @return Non-zero if bus:dev.fn of device matches.
+ */
+unsigned int pci_match_simple_dev(device_t dev, pci_devfn_t sdev)
+{
+ return dev->bus->secondary == PCI_DEV2SEGBUS(sdev) &&
+ dev->path.pci.devfn == PCI_DEV2DEVFN(sdev);
+}
+
+/**
* Scan a PCI bus.
*
* Determine the existence of devices and bridges on a PCI bus. If there are
diff --git a/src/include/device/pci.h b/src/include/device/pci.h
index be91ed353e..1741c0d1e9 100644
--- a/src/include/device/pci.h
+++ b/src/include/device/pci.h
@@ -79,6 +79,7 @@ unsigned pci_find_capability(device_t dev, unsigned cap);
struct resource *pci_get_resource(struct device *dev, unsigned long index);
void pci_dev_set_subsystem(device_t dev, unsigned vendor, unsigned device);
void pci_dev_init(struct device *dev);
+unsigned int pci_match_simple_dev(device_t dev, pci_devfn_t sdev);
void pci_assign_irqs(unsigned bus, unsigned slot,
const unsigned char pIntAtoD[4]);
diff --git a/src/include/device/pci_def.h b/src/include/device/pci_def.h
index ac20659f10..dae4e685b5 100644
--- a/src/include/device/pci_def.h
+++ b/src/include/device/pci_def.h
@@ -474,4 +474,8 @@
#define PCI_FUNC(devfn) ((devfn) & 0x07)
#define PCI_BDF(bus,dev,func) ((bus) << 16 | (dev) << 11 | (func) << 8)
+/* Translation from PCI_DEV() to devicetree bus and path.pci.devfn. */
+#define PCI_DEV2DEVFN(sdev) (((sdev)>>12) & 0xff)
+#define PCI_DEV2SEGBUS(sdev) (((sdev)>>20) & 0xfff)
+
#endif /* PCI_DEF_H */