ar2315_pci_reg_read
u32 ret = ar2315_pci_reg_read(apc, reg);
isr = ar2315_pci_reg_read(apc, AR2315_PCI_ISR);
isr = ar2315_pci_reg_read(apc, AR2315_PCI_ISR);
u32 pending = ar2315_pci_reg_read(apc, AR2315_PCI_ISR) &
ar2315_pci_reg_read(apc, AR2315_PCI_IMR);
ar2315_pci_reg_read(apc, AR2315_PCI_UNCACHE_CFG);