SH4A_PCIEMACCTLR
data = pci_read_reg(chan, SH4A_PCIEMACCTLR);
pci_write_reg(chan, data, SH4A_PCIEMACCTLR);
data = pci_read_reg(chan, SH4A_PCIEMACCTLR);
pci_write_reg(chan, data, SH4A_PCIEMACCTLR);