Added support for PCI prefetchable region and BARs

If a host controller sets up a region as prefetchable and
a device's BAR denotes it as prefetchable, allocate the
BAR into the prefetch region.

If a BAR is prefetchable and no prefetchable region has
been setup by the controller we fall back to allocating
the BAR into the normally memory region.
Patch by Kumar Gala 11 Jan 2006

1 files changed, 48 insertions, 10 deletions

diff --git a/drivers/pci_auto.c b/drivers/pci_auto.c
index 3302457a39..15f74328f0 100644
--- a/drivers/pci_auto.c
+++ b/drivers/pci_auto.c
@@ -77,6 +77,7 @@ int pciauto_region_allocate(struct pci_region* res, unsigned int size, unsigned
 void pciauto_setup_device(struct pci_controller *hose,
 			  pci_dev_t dev, int bars_num,
 			  struct pci_region *mem,
+			  struct pci_region *prefetch,
 			  struct pci_region *io)
 {
 	unsigned int bar_value, bar_response, bar_size;
@@ -111,7 +112,10 @@ void pciauto_setup_device(struct pci_controller *hose,
 				found_mem64 = 1;
 
 			bar_size = ~(bar_response & PCI_BASE_ADDRESS_MEM_MASK) + 1;
-			bar_res = mem;
+			if (prefetch && (bar_response & PCI_BASE_ADDRESS_MEM_PREFETCH))
+				bar_res = prefetch;
+			else
+				bar_res = mem;
 
 			DEBUGF("PCI Autoconfig: BAR %d, Mem, size=0x%x, ", bar_nr, bar_size);
 		}
@@ -148,6 +152,7 @@ static void pciauto_prescan_setup_bridge(struct pci_controller *hose,
 					 pci_dev_t dev, int sub_bus)
 {
 	struct pci_region *pci_mem = hose->pci_mem;
+	struct pci_region *pci_prefetch = hose->pci_prefetch;
 	struct pci_region *pci_io = hose->pci_io;
 	unsigned int cmdstat;
 
@@ -169,6 +174,21 @@ static void pciauto_prescan_setup_bridge(struct pci_controller *hose,
 		cmdstat |= PCI_COMMAND_MEMORY;
 	}
 
+	if (pci_prefetch) {
+		/* Round memory allocator to 1MB boundary */
+		pciauto_region_align(pci_prefetch, 0x100000);
+
+		/* Set up memory and I/O filter limits, assume 32-bit I/O space */
+		pci_hose_write_config_word(hose, dev, PCI_PREF_MEMORY_BASE,
+					(pci_prefetch->bus_lower & 0xfff00000) >> 16);
+
+		cmdstat |= PCI_COMMAND_MEMORY;
+	} else {
+		/* We don't support prefetchable memory for now, so disable */
+		pci_hose_write_config_word(hose, dev, PCI_PREF_MEMORY_BASE, 0x1000);
+		pci_hose_write_config_word(hose, dev, PCI_PREF_MEMORY_LIMIT, 0x1000);
+	}
+
 	if (pci_io) {
 		/* Round I/O allocator to 4KB boundary */
 		pciauto_region_align(pci_io, 0x1000);
@@ -181,10 +201,6 @@ static void pciauto_prescan_setup_bridge(struct pci_controller *hose,
 		cmdstat |= PCI_COMMAND_IO;
 	}
 
-	/* We don't support prefetchable memory for now, so disable */
-	pci_hose_write_config_word(hose, dev, PCI_PREF_MEMORY_BASE, 0x1000);
-	pci_hose_write_config_word(hose, dev, PCI_PREF_MEMORY_LIMIT, 0x1000);
-
 	/* Enable memory and I/O accesses, enable bus master */
 	pci_hose_write_config_dword(hose, dev, PCI_COMMAND, cmdstat | PCI_COMMAND_MASTER);
 }
@@ -193,6 +209,7 @@ static void pciauto_postscan_setup_bridge(struct pci_controller *hose,
 					  pci_dev_t dev, int sub_bus)
 {
 	struct pci_region *pci_mem = hose->pci_mem;
+	struct pci_region *pci_prefetch = hose->pci_prefetch;
 	struct pci_region *pci_io = hose->pci_io;
 
 	/* Configure bus number registers */
@@ -206,6 +223,14 @@ static void pciauto_postscan_setup_bridge(struct pci_controller *hose,
 					(pci_mem->bus_lower-1) >> 16);
 	}
 
+	if (pci_prefetch) {
+		/* Round memory allocator to 1MB boundary */
+		pciauto_region_align(pci_prefetch, 0x100000);
+
+		pci_hose_write_config_word(hose, dev, PCI_PREF_MEMORY_LIMIT,
+					(pci_prefetch->bus_lower-1) >> 16);
+	}
+
 	if (pci_io) {
 		/* Round I/O allocator to 4KB boundary */
 		pciauto_region_align(pci_io, 0x1000);
@@ -239,6 +264,11 @@ void pciauto_config_init(struct pci_controller *hose)
 			    hose->pci_mem->size < hose->regions[i].size)
 				hose->pci_mem = hose->regions + i;
 			break;
+		case (PCI_REGION_MEM | PCI_REGION_PREFETCH):
+			if (!hose->pci_prefetch ||
+			    hose->pci_prefetch->size < hose->regions[i].size)
+				hose->pci_prefetch = hose->regions + i;
+			break;
 		}
 	}
 
@@ -251,6 +281,14 @@ void pciauto_config_init(struct pci_controller *hose)
 		    hose->pci_mem->bus_start + hose->pci_mem->size - 1);
 	}
 
+	if (hose->pci_prefetch) {
+		pciauto_region_init(hose->pci_prefetch);
+
+		DEBUGF("PCI Autoconfig: Prefetchable Memory region: [%lx-%lx]\n",
+		    hose->pci_prefetch->bus_start,
+		    hose->pci_prefetch->bus_start + hose->pci_prefetch->size - 1);
+	}
+
 	if (hose->pci_io) {
 		pciauto_region_init(hose->pci_io);
 
@@ -275,7 +313,7 @@ int pciauto_config_device(struct pci_controller *hose, pci_dev_t dev)
 	switch(class) {
 	case PCI_CLASS_BRIDGE_PCI:
 		hose->current_busno++;
-		pciauto_setup_device(hose, dev, 2, hose->pci_mem, hose->pci_io);
+		pciauto_setup_device(hose, dev, 2, hose->pci_mem, hose->pci_prefetch, hose->pci_io);
 
 		DEBUGF("PCI Autoconfig: Found P2P bridge, device %d\n", PCI_DEV(dev));
 
@@ -301,12 +339,12 @@ int pciauto_config_device(struct pci_controller *hose, pci_dev_t dev)
 			return sub_bus;
 		}
 
-		pciauto_setup_device(hose, dev, 6, hose->pci_mem, hose->pci_io);
+		pciauto_setup_device(hose, dev, 6, hose->pci_mem, hose->pci_prefetch, hose->pci_io);
 		break;
 
 	case PCI_CLASS_BRIDGE_CARDBUS:
 		/* just do a minimal setup of the bridge, let the OS take care of the rest */
-		pciauto_setup_device(hose, dev, 0, hose->pci_mem, hose->pci_io);
+		pciauto_setup_device(hose, dev, 0, hose->pci_mem, hose->pci_prefetch, hose->pci_io);
 
 		DEBUGF("PCI Autoconfig: Found P2CardBus bridge, device %d\n", PCI_DEV(dev));
 
@@ -328,11 +366,11 @@ int pciauto_config_device(struct pci_controller *hose, pci_dev_t dev)
 		 * the PIMMR window to be allocated (BAR0 - 1MB size)
 		 */
 		DEBUGF("PCI Autoconfig: Broken bridge found, only minimal config\n");
-		pciauto_setup_device(hose, dev, 0, hose->pci_mem, hose->pci_io);
+		pciauto_setup_device(hose, dev, 0, hose->pci_mem, hose->pci_prefetch, hose->pci_io);
 		break;
 #endif
 	default:
-		pciauto_setup_device(hose, dev, 6, hose->pci_mem, hose->pci_io);
+		pciauto_setup_device(hose, dev, 6, hose->pci_mem, hose->pci_prefetch, hose->pci_io);
 		break;
 	}