LOONGSON2_CMCDMA_CCR_PSIZE_MASK
ccr |= FIELD_PREP(LOONGSON2_CMCDMA_CCR_PSIZE_MASK, dev_width) |
lchan->chan_reg.ccr &= ~(LOONGSON2_CMCDMA_CCR_PSIZE_MASK | LOONGSON2_CMCDMA_CCR_MSIZE_MASK);
width = FIELD_GET(LOONGSON2_CMCDMA_CCR_PSIZE_MASK, ccr);