PCI: dwc: Remove read_dbi2 code

The DBI2 appears to be write-only and there's no read accesses in the code
anyways, so let's remove all the read_dbi2 related code.

Link: https://lore.kernel.org/r/20200821035420.380495-33-robh@kernel.orgSigned-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Murali Karicheri <m-karicheri2@ti.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Jingoo Han <jingoohan1@gmail.com>
Cc: Gustavo Pimentel <gustavo.pimentel@synopsys.com>

drivers/pci/controller/dwc/pci-keystone.c

@@ -881,18 +881,6 @@ static int __init ks_pcie_add_pcie_port(struct keystone_pcie *ks_pcie,
 	return 0;
 }
 
-static u32 ks_pcie_am654_read_dbi2(struct dw_pcie *pci, void __iomem *base,
-				   u32 reg, size_t size)
-{
-	struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
-	u32 val;
-
-	ks_pcie_set_dbi_mode(ks_pcie);
-	dw_pcie_read(base + reg, size, &val);
-	ks_pcie_clear_dbi_mode(ks_pcie);
-	return val;
-}
-
 static void ks_pcie_am654_write_dbi2(struct dw_pcie *pci, void __iomem *base,
 				     u32 reg, size_t size, u32 val)
 {
@@ -907,7 +895,6 @@ static const struct dw_pcie_ops ks_pcie_dw_pcie_ops = {
 	.start_link = ks_pcie_start_link,
 	.stop_link = ks_pcie_stop_link,
 	.link_up = ks_pcie_link_up,
-	.read_dbi2 = ks_pcie_am654_read_dbi2,
 	.write_dbi2 = ks_pcie_am654_write_dbi2,
 };
 

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

@@ -166,21 +166,6 @@ void dw_pcie_write_dbi(struct dw_pcie *pci, u32 reg, size_t size, u32 val)
 }
 EXPORT_SYMBOL_GPL(dw_pcie_write_dbi);
 
-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, pci->dbi_base2, reg, size);
-
-	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, u32 reg, size_t size, u32 val)
 {
 	int ret;

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

@@ -232,8 +232,6 @@ struct dw_pcie_ops {
 			    size_t size);
 	void	(*write_dbi)(struct dw_pcie *pcie, void __iomem *base, u32 reg,
 			     size_t size, u32 val);
-	u32     (*read_dbi2)(struct dw_pcie *pcie, void __iomem *base, u32 reg,
-			     size_t size);
 	void    (*write_dbi2)(struct dw_pcie *pcie, void __iomem *base, u32 reg,
 			      size_t size, u32 val);
 	int	(*link_up)(struct dw_pcie *pcie);
@@ -269,7 +267,6 @@ int dw_pcie_write(void __iomem *addr, int 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);
@@ -322,11 +319,6 @@ static inline void dw_pcie_writel_dbi2(struct dw_pcie *pci, u32 reg, u32 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, reg, 0x4);
-}
-
 static inline void dw_pcie_writel_atu(struct dw_pcie *pci, u32 reg, u32 val)
 {
 	dw_pcie_write_atu(pci, reg, 0x4, val);