ata_do_simple_cmd - Set port up for dma.
int ata_do_simple_cmd (struct ata_port * ap, struct ata_device * dev, u8 cmd);
ap Port to initialize dev -- undescribed -- cmd -- undescribed --
Called just after data structures for each port are initialized. Allocates space for PRD table. May be used as the port_start entry in ata_port_operations.
Inherited from caller.