TG3_EAV_REF_CLCK_CTL
u32 clock_ctl = tr32(TG3_EAV_REF_CLCK_CTL);
tw32(TG3_EAV_REF_CLCK_CTL, clock_ctl | TG3_EAV_REF_CLCK_CTL_STOP);
tw32_f(TG3_EAV_REF_CLCK_CTL, clock_ctl | TG3_EAV_REF_CLCK_CTL_RESUME);
clock_ctl = tr32(TG3_EAV_REF_CLCK_CTL);
tw32(TG3_EAV_REF_CLCK_CTL,
tw32(TG3_EAV_REF_CLCK_CTL, clock_ctl);