[U-Boot-Users] [PATCH] Added support for PCI prefetchable region and BARs

Kumar Gala galak at gate.crashing.org
Tue Nov 22 20:29:14 CET 2005


Added support for PCI prefetchable region and BARs

Signed-off-by: Kumar Gala <galak at kernel.crashing.org>

CHANGELOG:
* 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 22 Nov 2005

---
commit f6a259d086597f691d821a5ac2181ce249fad987
tree 455dc92391d7b33119acd175595a2778ea6bcaa5
parent 680def7ecaabea707792ff987cd9baa9b4e18b38
author Kumar Gala <galak at kernel.crashing.org> Tue, 22 Nov 2005 13:29:25 -0600
committer Kumar Gala <galak at kernel.crashing.org> Tue, 22 Nov 2005 13:29:25 -0600

 drivers/pci_auto.c |   50 ++++++++++++++++++++++++++++++++++++++++++++------
 include/pci.h      |    4 +++-
 2 files changed, 47 insertions(+), 7 deletions(-)

diff --git a/drivers/pci_auto.c b/drivers/pci_auto.c
index 3302457..b70bacc 100644
--- a/drivers/pci_auto.c
+++ b/drivers/pci_auto.c
@@ -77,6 +77,7 @@ int pciauto_region_allocate(struct pci_r
 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_con
 				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
 					 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 +174,17 @@ static void pciauto_prescan_setup_bridge
 		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_MEMORY_BASE,
+					(pci_prefetch->bus_lower & 0xfff00000) >> 16);
+
+		cmdstat |= PCI_COMMAND_MEMORY;
+	}
+
 	if (pci_io) {
 		/* Round I/O allocator to 4KB boundary */
 		pciauto_region_align(pci_io, 0x1000);
@@ -193,6 +209,7 @@ static void pciauto_postscan_setup_bridg
 					  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_bridg
 					(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_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_cont
 			    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_cont
 		    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_con
 	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_con
 			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_con
 		 * 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;
 	}
 
diff --git a/include/pci.h b/include/pci.h
index 8f19997..f78a769 100644
--- a/include/pci.h
+++ b/include/pci.h
@@ -309,6 +309,7 @@ struct pci_region {
 #define PCI_REGION_MEM		0x00000000	/* PCI memory space */
 #define PCI_REGION_IO		0x00000001	/* PCI IO space */
 #define PCI_REGION_TYPE		0x00000001
+#define PCI_REGION_PREFETCH	0x00000008	/* prefetchable PCI memory */
 
 #define PCI_REGION_MEMORY	0x00000100	/* System memory */
 #define PCI_REGION_RO		0x00000200	/* Read-only memory */
@@ -386,7 +387,7 @@ struct pci_controller {
 	int (*write_dword)(struct pci_controller*, pci_dev_t, int where, u32);
 
 	/* Used by auto config */
-	struct pci_region *pci_mem, *pci_io;
+	struct pci_region *pci_mem, *pci_io, *pci_prefetch;
 
 	/* Used by ppc405 autoconfig*/
 	struct pci_region *pci_fb;
@@ -472,6 +473,7 @@ extern int pciauto_region_allocate(struc
 extern 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);
 int pciauto_config_device(struct pci_controller *hose, pci_dev_t dev);
 






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