IMX_USR1
bus_space_read_region_4(iot, ioh, IMX_USR1, usr, 2);
usr1 = bus_space_read_4(iot, ioh, IMX_USR1);
bus_space_write_4(iot, ioh, IMX_USR1, IMX_USR1_AGTIM);
usr1 = bus_space_read_4(iot, ioh, IMX_USR1);
if (bus_space_read_4(iot, ioh, IMX_USR1) & IMX_USR1_TRDY) {
bus_space_write_4(regsp->ur_iot, regsp->ur_ioh, IMX_USR1, 0xffff);
#define IMX_USRn(n) (IMX_USR1 + ((n) << 2))