Redefine pci_bus_default_ops as function

Taking device_t as a parameter, this allows to alter the PCI config
access handlers. This is useful to add tracing of PCI config writes
for devices having problems to initialise correctly.

On older AMD platform PCI MMIO may not be able to fully configure all
PCI devices/nodes, while MMIO_SUPPORT_DEFAULT would be preferred due
to its atomic nature. So those can be forced to IO config instead.

Change-Id: I2162884185bbfe461b036caf737980b45a51e522
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/3608
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@google.com>

1 files changed, 31 insertions, 10 deletions

diff --git a/src/device/pci_ops.c b/src/device/pci_ops.c
index b0281f4943..5b633c8667 100644
--- a/src/device/pci_ops.c
+++ b/src/device/pci_ops.c
@@ -25,9 +25,30 @@
 #include <device/pci_ids.h>
 #include <device/pci_ops.h>
 
+const struct pci_bus_operations *pci_bus_default_ops(device_t dev)
+{
+#if CONFIG_MMCONF_SUPPORT_DEFAULT
+	return &pci_ops_mmconf;
+#else
+	return &pci_cf8_conf1;
+#endif
+}
+
+static const struct pci_bus_operations *pci_bus_ops(struct bus *bus, device_t dev)
+{
+	const struct pci_bus_operations *bops;
+	bops = NULL;
+	if (bus && bus->dev && bus->dev->ops && bus->dev->ops->ops_pci_bus) {
+		bops = bus->dev->ops->ops_pci_bus(dev);
+	}
+	if (!bops)
+		bops = pci_bus_default_ops(dev);
+	return bops;
+}
+
 /*
- * The only consumer of the return value of get_pbus() is ops_pci_bus().
- * ops_pci_bus() can handle being passed NULL and auto-picks working ops.
+ * The only consumer of the return value of get_pbus() is pci_bus_ops().
+ * pci_bus_ops() can handle being passed NULL and auto-picks working ops.
  */
 static struct bus *get_pbus(device_t dev)
 {
@@ -38,10 +59,10 @@ static struct bus *get_pbus(device_t dev)
 	else
 		pbus = dev->bus;
 
-	while (pbus && pbus->dev && !ops_pci_bus(pbus)) {
+	while (pbus && pbus->dev && !pci_bus_ops(pbus, dev)) {
 		if (pbus == pbus->dev->bus) {
 			printk(BIOS_ALERT, "%s in endless loop looking for a "
-			       "parent bus with ops_pci_bus for %s, breaking "
+			       "parent bus with pci_bus_ops for %s, breaking "
 			       "out.\n", __func__, dev_path(dev));
 			break;
 		}
@@ -64,42 +85,42 @@ static struct bus *get_pbus(device_t dev)
 u8 pci_read_config8(device_t dev, unsigned int where)
 {
 	struct bus *pbus = get_pbus(dev);
-	return ops_pci_bus(pbus)->read8(pbus, dev->bus->secondary,
+	return pci_bus_ops(pbus, dev)->read8(pbus, dev->bus->secondary,
 					dev->path.pci.devfn, where);
 }
 
 u16 pci_read_config16(device_t dev, unsigned int where)
 {
 	struct bus *pbus = get_pbus(dev);
-	return ops_pci_bus(pbus)->read16(pbus, dev->bus->secondary,
+	return pci_bus_ops(pbus, dev)->read16(pbus, dev->bus->secondary,
 					 dev->path.pci.devfn, where);
 }
 
 u32 pci_read_config32(device_t dev, unsigned int where)
 {
 	struct bus *pbus = get_pbus(dev);
-	return ops_pci_bus(pbus)->read32(pbus, dev->bus->secondary,
+	return pci_bus_ops(pbus, dev)->read32(pbus, dev->bus->secondary,
 					 dev->path.pci.devfn, where);
 }
 
 void pci_write_config8(device_t dev, unsigned int where, u8 val)
 {
 	struct bus *pbus = get_pbus(dev);
-	ops_pci_bus(pbus)->write8(pbus, dev->bus->secondary,
+	pci_bus_ops(pbus, dev)->write8(pbus, dev->bus->secondary,
 				  dev->path.pci.devfn, where, val);
 }
 
 void pci_write_config16(device_t dev, unsigned int where, u16 val)
 {
 	struct bus *pbus = get_pbus(dev);
-	ops_pci_bus(pbus)->write16(pbus, dev->bus->secondary,
+	pci_bus_ops(pbus, dev)->write16(pbus, dev->bus->secondary,
 				   dev->path.pci.devfn, where, val);
 }
 
 void pci_write_config32(device_t dev, unsigned int where, u32 val)
 {
 	struct bus *pbus = get_pbus(dev);
-	ops_pci_bus(pbus)->write32(pbus, dev->bus->secondary,
+	pci_bus_ops(pbus, dev)->write32(pbus, dev->bus->secondary,
 				   dev->path.pci.devfn, where, val);
 }