BCH_BHCNT_ENC_COUNT_SHIFT
reg = params->size << BCH_BHCNT_ENC_COUNT_SHIFT;
#define BCH_BHCNT_ENC_COUNT_MASK (0x3ff << BCH_BHCNT_ENC_COUNT_SHIFT)
max_value = BCH_BHCNT_ENC_COUNT_MASK >> BCH_BHCNT_ENC_COUNT_SHIFT;