GITS_CWRITER
REGISTER_ITS_DESC(GITS_CWRITER,
writel_relaxed(wr, its->base + GITS_CWRITER);
gits_write_cwriter(0, base + GITS_CWRITER);
gits_write_cwriter(0, its->base + GITS_CWRITER);
u64 cwriter = its_read_u64(GITS_CWRITER);
its_write_u64(GITS_CWRITER, next);