PCI: dwc: Add support to program ATU for >4GB memory

Add support to program the ATU to enable translations for >4GB sizes of
the prefetchable memory apertures.

Link: https://lore.kernel.org/r/20201118144626.32189-3-vidyas@nvidia.comTested-by: Thierry Reding <treding@nvidia.com>
Tested-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Vidya Sagar <vidyas@nvidia.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: Jingoo <jingoohan1@gmail.com>

drivers/pci/controller/dwc/pcie-designware.c

@@ -228,7 +228,7 @@ static void dw_pcie_writel_ob_unroll(struct dw_pcie *pci, u32 index, u32 reg,
 static void dw_pcie_prog_outbound_atu_unroll(struct dw_pcie *pci, u8 func_no,
 					     int index, int type,
 					     u64 cpu_addr, u64 pci_addr,
-					     u32 size)
+					     u64 size)
 {
 	u32 retries, val;
 	u64 limit_addr = cpu_addr + size - 1;
@@ -245,8 +245,10 @@ static void dw_pcie_prog_outbound_atu_unroll(struct dw_pcie *pci, u8 func_no,
 				 lower_32_bits(pci_addr));
 	dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_UPPER_TARGET,
 				 upper_32_bits(pci_addr));
-	dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_REGION_CTRL1,
-				 type | PCIE_ATU_FUNC_NUM(func_no));
+	val = type | PCIE_ATU_FUNC_NUM(func_no);
+	val = upper_32_bits(size - 1) ?
+		val | PCIE_ATU_INCREASE_REGION_SIZE : val;
+	dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_REGION_CTRL1, val);
 	dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_REGION_CTRL2,
 				 PCIE_ATU_ENABLE);
 
@@ -267,7 +269,7 @@ static void dw_pcie_prog_outbound_atu_unroll(struct dw_pcie *pci, u8 func_no,
 
 static void __dw_pcie_prog_outbound_atu(struct dw_pcie *pci, u8 func_no,
 					int index, int type, u64 cpu_addr,
-					u64 pci_addr, u32 size)
+					u64 pci_addr, u64 size)
 {
 	u32 retries, val;
 
@@ -311,7 +313,7 @@ static void __dw_pcie_prog_outbound_atu(struct dw_pcie *pci, u8 func_no,
 }
 
 void dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index, int type,
-			       u64 cpu_addr, u64 pci_addr, u32 size)
+			       u64 cpu_addr, u64 pci_addr, u64 size)
 {
 	__dw_pcie_prog_outbound_atu(pci, 0, index, type,
 				    cpu_addr, pci_addr, size);

drivers/pci/controller/dwc/pcie-designware.h

@@ -81,6 +81,7 @@
 #define PCIE_ATU_REGION_INBOUND		BIT(31)
 #define PCIE_ATU_REGION_OUTBOUND	0
 #define PCIE_ATU_CR1			0x904
+#define PCIE_ATU_INCREASE_REGION_SIZE	BIT(13)
 #define PCIE_ATU_TYPE_MEM		0x0
 #define PCIE_ATU_TYPE_IO		0x2
 #define PCIE_ATU_TYPE_CFG0		0x4
@@ -293,7 +294,7 @@ void dw_pcie_upconfig_setup(struct dw_pcie *pci);
 int dw_pcie_wait_for_link(struct dw_pcie *pci);
 void dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index,
 			       int type, u64 cpu_addr, u64 pci_addr,
-			       u32 size);
+			       u64 size);
 void dw_pcie_prog_ep_outbound_atu(struct dw_pcie *pci, u8 func_no, int index,
 				  int type, u64 cpu_addr, u64 pci_addr,
 				  u32 size);