staging: mt7621-pci: add pcie_write and pcie_read helpers

Introdice this functions to make easier to write/read to/from
an offset relative to base address
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Tested-by: NeilBrown <neil@brown.name>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/mt7621-pci/pci-mt7621.c

@@ -204,6 +204,16 @@ struct mt7621_pcie {
 	struct list_head ports;
 };
 
+static inline u32 pcie_read(struct mt7621_pcie *pcie, u32 reg)
+{
+	return readl(pcie->base + reg);
+}
+
+static inline void pcie_write(struct mt7621_pcie *pcie, u32 val, u32 reg)
+{
+	writel(val, pcie->base + reg);
+}
+
 static inline u32 mt7621_pci_get_cfgaddr(unsigned int bus, unsigned int slot,
 					 unsigned int func, unsigned int where)
 {