PCI: dwc: Cleanup DBI,ATU read and write APIs

Cleanup DBI read and write APIs by removing leading "__" (underscore)
from their names as there is no reason to have leading underscores
in the first place in the function definition.

Remove dbi/dbi2 base address parameters as the same behaviour can be
obtained through read and write APIs. Since dw_pcie_{readl/writel}_dbi()
APIs can't be used for ATU read/write as ATU base address could be
different from DBI base address, implement ATU read/write APIs using ATU
base address without using dw_pcie_{readl/writel}_dbi() APIs.

Signed-off-by: Vidya Sagar <vidyas@nvidia.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Jingoo Han <jingoohan1@gmail.com>

1 files changed, 41 insertions, 16 deletions

diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
index 9d7c51c32b3b..c2843ea1d1e8 100644
--- a/drivers/pci/controller/dwc/pcie-designware.c
+++ b/drivers/pci/controller/dwc/pcie-designware.c
@@ -52,68 +52,93 @@ int dw_pcie_write(void __iomem *addr, int size, u32 val)
 	return PCIBIOS_SUCCESSFUL;
 }
 
-u32 __dw_pcie_read_dbi(struct dw_pcie *pci, void __iomem *base, u32 reg,
-		       size_t size)
+u32 dw_pcie_read_dbi(struct dw_pcie *pci, u32 reg, size_t size)
 {
 	int ret;
 	u32 val;
 
 	if (pci->ops->read_dbi)
-		return pci->ops->read_dbi(pci, base, reg, size);
+		return pci->ops->read_dbi(pci, pci->dbi_base, reg, size);
 
-	ret = dw_pcie_read(base + reg, size, &val);
+	ret = dw_pcie_read(pci->dbi_base + reg, size, &val);
 	if (ret)
 		dev_err(pci->dev, "Read DBI address failed\n");
 
 	return val;
 }
 
-void __dw_pcie_write_dbi(struct dw_pcie *pci, void __iomem *base, u32 reg,
-			 size_t size, u32 val)
+void dw_pcie_write_dbi(struct dw_pcie *pci, u32 reg, size_t size, u32 val)
 {
 	int ret;
 
 	if (pci->ops->write_dbi) {
-		pci->ops->write_dbi(pci, base, reg, size, val);
+		pci->ops->write_dbi(pci, pci->dbi_base, reg, size, val);
 		return;
 	}
 
-	ret = dw_pcie_write(base + reg, size, val);
+	ret = dw_pcie_write(pci->dbi_base + reg, size, val);
 	if (ret)
 		dev_err(pci->dev, "Write DBI address failed\n");
 }
 
-u32 __dw_pcie_read_dbi2(struct dw_pcie *pci, void __iomem *base, u32 reg,
-			size_t size)
+u32 dw_pcie_read_dbi2(struct dw_pcie *pci, u32 reg, size_t size)
 {
 	int ret;
 	u32 val;
 
 	if (pci->ops->read_dbi2)
-		return pci->ops->read_dbi2(pci, base, reg, size);
+		return pci->ops->read_dbi2(pci, pci->dbi_base2, reg, size);
 
-	ret = dw_pcie_read(base + reg, size, &val);
+	ret = dw_pcie_read(pci->dbi_base2 + reg, size, &val);
 	if (ret)
 		dev_err(pci->dev, "read DBI address failed\n");
 
 	return val;
 }
 
-void __dw_pcie_write_dbi2(struct dw_pcie *pci, void __iomem *base, u32 reg,
-			  size_t size, u32 val)
+void dw_pcie_write_dbi2(struct dw_pcie *pci, u32 reg, size_t size, u32 val)
 {
 	int ret;
 
 	if (pci->ops->write_dbi2) {
-		pci->ops->write_dbi2(pci, base, reg, size, val);
+		pci->ops->write_dbi2(pci, pci->dbi_base2, reg, size, val);
 		return;
 	}
 
-	ret = dw_pcie_write(base + reg, size, val);
+	ret = dw_pcie_write(pci->dbi_base2 + reg, size, val);
 	if (ret)
 		dev_err(pci->dev, "write DBI address failed\n");
 }
 
+u32 dw_pcie_read_atu(struct dw_pcie *pci, u32 reg, size_t size)
+{
+	int ret;
+	u32 val;
+
+	if (pci->ops->read_dbi)
+		return pci->ops->read_dbi(pci, pci->atu_base, reg, size);
+
+	ret = dw_pcie_read(pci->atu_base + reg, size, &val);
+	if (ret)
+		dev_err(pci->dev, "Read ATU address failed\n");
+
+	return val;
+}
+
+void dw_pcie_write_atu(struct dw_pcie *pci, u32 reg, size_t size, u32 val)
+{
+	int ret;
+
+	if (pci->ops->write_dbi) {
+		pci->ops->write_dbi(pci, pci->atu_base, reg, size, val);
+		return;
+	}
+
+	ret = dw_pcie_write(pci->atu_base + reg, size, val);
+	if (ret)
+		dev_err(pci->dev, "Write ATU address failed\n");
+}
+
 static u32 dw_pcie_readl_ob_unroll(struct dw_pcie *pci, u32 index, u32 reg)
 {
 	u32 offset = PCIE_GET_ATU_OUTB_UNR_REG_OFFSET(index);