Extend struct todr_chip_handle with a todr_quality member. This allows us
to assign a quality to RTC implementation and pick the "best" RTC if a
system has multiple RTCs (or multiple interfaces to an RTC). This allows
us to prefer a battery-backed I2C RTC over an RTC that is part of the SoC
which is only running of the SoC is powered. It also allows us to
work around issues with firmware RTC interfaces that may lie to us or
even crash the system.

This change makes sure the todr_quality member of the struct is always
initialized. In most cases the quality will be set to zero; further
adjustments of the quality for specific subsystems/architectures will follow.

ok cheloha@, patrick@

Constify struct cfattach.

ok visa@ a long time ago

move the todr chip handle into a prtc_softc structure

no realy change, this avoid having to allocate the todr struct in attach

ok deraadt@

add support for storing the time of day on OPL based machines.

this let's me pull the date back from 2023 to 2018, and have it
stay like that after a reboot.

ok deraadt@

Fix formwat string. Cast pointer to long and print it using %lx since %p
prefixes the address with 0x which we want to avoid here.

Add support for getting the time of day on the m4k.

First shot at a driver to get the time-of-day on the e10k.

Constify struct cfattach.

ok visa@ a long time ago

move the todr chip handle into a prtc_softc structure

no realy change, this avoid having to allocate the todr struct in attach

ok deraadt@

add support for storing the time of day on OPL based machines.

this let's me pull the date back from 2023 to 2018, and have it
stay like that after a reboot.

ok deraadt@

Fix formwat string. Cast pointer to long and print it using %lx since %p
prefixes the address with 0x which we want to avoid here.

Add support for getting the time of day on the m4k.

First shot at a driver to get the time-of-day on the e10k.

move the todr chip handle into a prtc_softc structure

no realy change, this avoid having to allocate the todr struct in attach

ok deraadt@

add support for storing the time of day on OPL based machines.

this let's me pull the date back from 2023 to 2018, and have it
stay like that after a reboot.

ok deraadt@

Fix formwat string. Cast pointer to long and print it using %lx since %p
prefixes the address with 0x which we want to avoid here.

Add support for getting the time of day on the m4k.

First shot at a driver to get the time-of-day on the e10k.

Fix formwat string. Cast pointer to long and print it using %lx since %p
prefixes the address with 0x which we want to avoid here.

Add support for getting the time of day on the m4k.

First shot at a driver to get the time-of-day on the e10k.