From Shiva mahimna strotra shiva gave chakra to vishnu.
हरिस्ते साहस्रं कमल बलिमाधाय पदयोः
यदेकोने तस्मिन् निजमुदहरन्नेत्रकमलम्।
गतो भक्त्युद्रेकः परिणतिमसौ चक्रवपुषः
त्रयाणां रक्षायै त्रिपुरहर जागर्ति जगताम्॥ १९॥
VishhNu once brought 1000 lotuses and was placing them at your feet; after placing 999 flowers he found that one was missing; he plucked out one of his own eyes and offered it as a lotus; this supreme exemplification of devotion on his part was transformed into the wheel (sudarshana chakra) in his hand, which he uses for protecting the world .
