[PATCH V9 2/3] PCI: dwc: Cleanup DBI,ATU read and write APIs

[Vidya Sagar <vidyas@nvidia.com>]

Cleanup DBI read and write APIs by removing "__" (underscore) from their
names as there are no no-underscore versions and the underscore versions
are already doing what no-underscore versions typically do. It also removes
passing dbi/dbi2 base address as one of the arguments as the same can be
derived with in 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, this patch attempts to 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>
---
Changes from v8:
* Removed exporting dw_pcie_{read/write}_atu() APIs

Changes from v7:
* Based on suggestion from Jingoo Han, moved implementation of readl, writel for ATU
  region to separate APIs dw_pcie_{read/write}_atu() in pcie-designware.c file and
  calling them from pcie-designware.h file.

Changes from v6:
* Modified ATU read/write APIs to use implementation specific DBI read/write
  APIs if present.

Changes from v5:
* Removed passing base address as one of the arguments as the same can be derived within
  the API itself.
* Modified ATU read/write APIs to call dw_pcie_{write/read}() API

Changes from v4:
* This is a new patch in this series

 drivers/pci/controller/dwc/pcie-designware.c | 57 ++++++++++++++------
 drivers/pci/controller/dwc/pcie-designware.h | 34 ++++++------
 2 files changed, 57 insertions(+), 34 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);
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index 14762e262758..ffed084a0b4f 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -254,14 +254,12 @@ struct dw_pcie {
 int dw_pcie_read(void __iomem *addr, int size, u32 *val);
 int dw_pcie_write(void __iomem *addr, int size, u32 val);
 
-u32 __dw_pcie_read_dbi(struct dw_pcie *pci, void __iomem *base, u32 reg,
-		       size_t size);
-void __dw_pcie_write_dbi(struct dw_pcie *pci, void __iomem *base, u32 reg,
-			 size_t size, u32 val);
-u32 __dw_pcie_read_dbi2(struct dw_pcie *pci, void __iomem *base, u32 reg,
-			size_t size);
-void __dw_pcie_write_dbi2(struct dw_pcie *pci, void __iomem *base, u32 reg,
-			  size_t size, u32 val);
+u32 dw_pcie_read_dbi(struct dw_pcie *pci, u32 reg, size_t size);
+void dw_pcie_write_dbi(struct dw_pcie *pci, u32 reg, size_t size, u32 val);
+u32 dw_pcie_read_dbi2(struct dw_pcie *pci, u32 reg, size_t size);
+void dw_pcie_write_dbi2(struct dw_pcie *pci, u32 reg, size_t size, u32 val);
+u32 dw_pcie_read_atu(struct dw_pcie *pci, u32 reg, size_t size);
+void dw_pcie_write_atu(struct dw_pcie *pci, u32 reg, size_t size, u32 val);
 int dw_pcie_link_up(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,
@@ -275,52 +273,52 @@ void dw_pcie_setup(struct dw_pcie *pci);
 
 static inline void dw_pcie_writel_dbi(struct dw_pcie *pci, u32 reg, u32 val)
 {
-	__dw_pcie_write_dbi(pci, pci->dbi_base, reg, 0x4, val);
+	dw_pcie_write_dbi(pci, reg, 0x4, val);
 }
 
 static inline u32 dw_pcie_readl_dbi(struct dw_pcie *pci, u32 reg)
 {
-	return __dw_pcie_read_dbi(pci, pci->dbi_base, reg, 0x4);
+	return dw_pcie_read_dbi(pci, reg, 0x4);
 }
 
 static inline void dw_pcie_writew_dbi(struct dw_pcie *pci, u32 reg, u16 val)
 {
-	__dw_pcie_write_dbi(pci, pci->dbi_base, reg, 0x2, val);
+	dw_pcie_write_dbi(pci, reg, 0x2, val);
 }
 
 static inline u16 dw_pcie_readw_dbi(struct dw_pcie *pci, u32 reg)
 {
-	return __dw_pcie_read_dbi(pci, pci->dbi_base, reg, 0x2);
+	return dw_pcie_read_dbi(pci, reg, 0x2);
 }
 
 static inline void dw_pcie_writeb_dbi(struct dw_pcie *pci, u32 reg, u8 val)
 {
-	__dw_pcie_write_dbi(pci, pci->dbi_base, reg, 0x1, val);
+	dw_pcie_write_dbi(pci, reg, 0x1, val);
 }
 
 static inline u8 dw_pcie_readb_dbi(struct dw_pcie *pci, u32 reg)
 {
-	return __dw_pcie_read_dbi(pci, pci->dbi_base, reg, 0x1);
+	return dw_pcie_read_dbi(pci, reg, 0x1);
 }
 
 static inline void dw_pcie_writel_dbi2(struct dw_pcie *pci, u32 reg, u32 val)
 {
-	__dw_pcie_write_dbi2(pci, pci->dbi_base2, reg, 0x4, val);
+	dw_pcie_write_dbi2(pci, reg, 0x4, val);
 }
 
 static inline u32 dw_pcie_readl_dbi2(struct dw_pcie *pci, u32 reg)
 {
-	return __dw_pcie_read_dbi2(pci, pci->dbi_base2, reg, 0x4);
+	return dw_pcie_read_dbi2(pci, reg, 0x4);
 }
 
 static inline void dw_pcie_writel_atu(struct dw_pcie *pci, u32 reg, u32 val)
 {
-	__dw_pcie_write_dbi(pci, pci->atu_base, reg, 0x4, val);
+	dw_pcie_write_atu(pci, reg, 0x4, val);
 }
 
 static inline u32 dw_pcie_readl_atu(struct dw_pcie *pci, u32 reg)
 {
-	return __dw_pcie_read_dbi(pci, pci->atu_base, reg, 0x4);
+	return dw_pcie_read_atu(pci, reg, 0x4);
 }
 
 static inline void dw_pcie_dbi_ro_wr_en(struct dw_pcie *pci)
-- 
2.17.1