Create a wrapper for newbus to take giant and for busses to take it too.
bus_topo_lock() should be called before interacting with newbus routines
and unlocked with bus_topo_unlock(). If you need the topology lock for
some reason, bus_topo_mtx() will provide that.
Sponsored by: Netflix
Reviewed by: mav
Differential Revision: https://reviews.freebsd.org/D31831
(cherry picked from commit c6df6f5322)
Add a CAM-Newbus SDIO support module. This works provides a newbus
infrastructure for device drivers wanting to use SDIO. On the lower end
while it is connected by newbus to SDHCI, it talks CAM using the MMCCAM
framework to get to it.
This also duplicates the usbdevs framework to equally create sdiodev
header files with #defines for "vendors" and "products".
Submitted by: kibab (initial work, see https://reviews.freebsd.org/D12467)
Reviewed by: kibab, imp (comments on earlier version)
MFC after: 6 weeks
Relnotes: yes
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D19749
