REG_PORT_ENABLE
(void) t1_tpi_read(mac->adapter, REG_PORT_ENABLE, &val);
(void) t1_tpi_write(mac->adapter, REG_PORT_ENABLE, val);
(void) t1_tpi_read(adapter, REG_PORT_ENABLE, &val);
(void) t1_tpi_write(adapter, REG_PORT_ENABLE, val);
(void) t1_tpi_write(adapter, REG_PORT_ENABLE, 0);