src/sys/dev/mc146818, branch releng/7.3

MFC: r201009

2010-01-15T16:29:41Z

Remove clause 3 from Izumi Tsutsui's licenses. Obtained from: NetBSD

MFC: r201008

2010-01-15T16:28:02Z

Style changes Obtained from: NetBSD (mc146818reg.h)

Export mc146818_def_{read,write}() so the front-end can make use

2007-06-16T23:10:00Z

of them if needed.

Add macros for the individual divisor bits as some MC146818A-compatible

2007-01-20T14:57:51Z

chips also use them for different purposes.

After some input from bde@ and rereading the datasheet use a MTX_SPIN

2005-06-04T23:24:50Z

mutex instead of a MTX_DEF one in order to defer preemption while reading the date and time registers. If we don't manage to read them within the time slot where we are guaranteed that no updates occur we might actually read them during an update in which case the output is undefined.

o mc146818(4):

2005-05-19T21:20:42Z

- Add locking. - Account for if the MC146818_NO_CENT_ADJUST flag is set we don't need to check wheter year < POSIX_BASE_YEAR. - Add some comments about mapping the day of week from the range the generic clock code uses to the range the chip uses and which I meant to add in the initial version. - Minor clean-up, use __func__ instead of hardcoded function names in error strings. o in the rtc(4) front-end additionally: - Don't leak resources in case mc146818_attach() fails. - Account for ebus(4) defaulting to SYS_RES_MEMORY for the memory resources since ebus.c rev. 1.22.

Start each of the license/copyright comments with /*-, minor shuffle of lines

2005-01-06T01:43:34Z

Add a driver back end for MC146818 and compatible clocks based on the

2004-11-17T16:37:25Z

respective NetBSD driver for use with the genclock interface. It's first use will be on sparc64 but it was also tested on alpha with a preliminary patch to switch alpha to use the genclock code together with this driver instead of the respective code in alpha/alpha/clock.c and the rather MD mcclock(4). Using it on i386 and amd64 won't be that hard but some changes/extensions to improve the genclock code in general should be done first, e.g. add locking and make it easier to access the NVRAM usually coupled with RTCs.

Add missing $FreeBSD$

2000-05-01T19:54:26Z

Major changes to the generic device framework for FreeBSD/alpha:

1998-06-14T13:46:10Z

* Eliminate bus_t and make it possible for all devices to have attached children. * Support dynamically extendable interfaces for drivers to replace both the function pointers in driver_t and bus_ops_t (which has been removed entirely. Two system defined interfaces have been defined, 'device' which is mandatory for all devices and 'bus' which is recommended for all devices which support attached children. * In addition, the alpha port defines two simple interfaces 'clock' for attaching various real time clocks to the system and 'mcclock' for the many different variations of mc146818 clocks which can be attached to different alpha platforms. This eliminates two more function pointer tables in favour of the generic method dispatch system provided by the device framework. Future device interfaces may include: * cdev and bdev interfaces for devfs to use in replacement for specfs and the fixed interfaces bdevsw and cdevsw. * scsi interface to replace struct scsi_adapter (not sure how this works in CAM but I imagine there is something similar there). * various tailored interfaces for different bus types such as pci, isa, pccard etc.