pci_attach_args *" instead of from four separate parameters which in
all cases were extracted from the same "struct pci_attach_args".
This both simplifies the driver api, and allows for alternate PCI
interrupt mapping schemes, such as one using the tables described in
the Intel Multiprocessor Spec which describe interrupt wirings for
devices behind pci-pci bridges based on the device's location rather
the bridge's location.
Tested on alpha and i386; welcome to 1.5Q
* resid in pcscp_dma_intr() should also be set in the data out phase.
* Don't set up DMA in the transfer pad operations.
* Change URL of the PDF technical manual to the index page.
* include <machine/bswap.h> on big endian machines.
Fixes timeouts writing large blocks to tapes. From Izumi Tsutsui,
PR 7252.
