Actually, there are four separate verbs. I checked various dictionaries and websites. I summarize my findings below.
wake, woke1, waked2/woken/woke3
awake, awoke1, awaked2/awoken/awoke3
waken, wakened, wakened [regular]
awaken, awakened, awakened [regular]
1Rarely,
(a)waked.
2Preferred past participle according to American Heritage Dictionary.
3Rare or regional.
All four are both transitive and intransitive, but the tendency is to use
awake intransitively and
waken transitively. In the passive the tendency is to use the regular verbs
awaken or
waken. Only
wake takes
up.
CJ