TX_ENABLE
reg |= TX_ENABLE|ER_ENABLE;
reg &= ~(TX_ENABLE|ER_ENABLE);
val = TX_ENABLE;
enable = TX_ENABLE;
writel(reg_val_GCR | TX_ENABLE, msp->registers + MSP_GCR);
writel(reg_val_GCR & ~TX_ENABLE, msp->registers + MSP_GCR);
(~TX_ENABLE)), msp->registers + MSP_GCR);
enable_bit = TX_ENABLE;