Intro: The chords I have worked out here consist of two base notes only.
Some of them are power chords (neither major nor minor, no 3rd)

D5       55xxxx
Bm*      75xxxx
Asus4    55xxxx (same as D*)
G5       35xxxx
A5       57xxxx
Dsus2    xx0230
/  /    /  /     /  /   /   /
The intro sequence I think, is this D5      Bm*      Asus4  G5  A5

VERSE
Bm*          D5           Bm*      Asus4        G5        D5     D  D Dsus2  D
Darlin' wake up now, I'm makin' a promise that I'm gonna keep
Bm*             D5            Bm*       Asus4        G5           A5
I'll never give up now, when love is a passion that can't go to sleep

CHORUS
A5               D5  G5  A5                      D5                  G5        A5
Until the mighty rivers,        until the mighty oceans dry up, I'll be your man
A5               D5  G5  A5                        D5                   G5      A5
Until the mighty rivers           all run dry and fade away girl you understand

VERSE
They tell you there's no chance, for love to be stable when everything shakes
It only took the one glance, for my heart to tremble and my soul to quake

REPEAT CHORUS (plus)
A5              Bm* D5                   A5 D5
Till the Mighty rivers       ooh mighty rivers,

BRIDGE
Bm*          D5      Bm*               D5
Ooh can you hear me as you run into my back
Bm*                    D5        Bm*                 A5
And the customs never clear me, they want to put me behind black

REPEAT INTRO

VERSE
Oh darlin wake uh up now, before there's no sunshine left up in the sky
I'll never give up now, let's she'd all the teardrops and let our hearts dry

REPEAT CHORUS (plus)
D5                   Bm*                  D5
Until the mighty rivers,   the mighty rivers,   the mighty rivers,
Bm*                D5                 Bm*
The mighty rivers, the mighty rivers, the mighty rivers,

REPEAT CHORUS
D5   A5  Bm*             G5  A5  D5
Till the mighty rivers oooooh mighty rivers...