ATC_DST_WIDTH
FIELD_PREP(ATC_DST_WIDTH, dst_width);
u32 ctrla = FIELD_PREP(ATC_SRC_WIDTH, 2) | FIELD_PREP(ATC_DST_WIDTH, 2);
ctrla |= FIELD_PREP(ATC_DST_WIDTH, reg_width);
FIELD_PREP(ATC_DST_WIDTH, mem_width) |
FIELD_PREP(ATC_DST_WIDTH, reg_width) |
FIELD_PREP(ATC_DST_WIDTH, dwidth);