dc295ed278
* 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.
114 lines
2.7 KiB
C
114 lines
2.7 KiB
C
/* $Id: mcclock.c,v 1.1 1998/06/10 10:56:23 dfr Exp $ */
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/* $NetBSD: mcclock.c,v 1.11 1998/04/19 07:50:25 jonathan Exp $ */
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/*
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* Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Author: Chris G. Demetriou
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <machine/clockvar.h>
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#include <dev/dec/mcclockvar.h>
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#include <dev/dec/mc146818reg.h>
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/*
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* XXX rate is machine-dependent.
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*/
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#ifdef __alpha__
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#define MC_DEFAULTRATE MC_RATE_1024_Hz
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#endif
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#ifdef __pmax__
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#define MC_DEFAULTRATE MC_RATE_256_Hz
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#endif
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void
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mcclock_attach(device_t dev)
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{
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/* Turn interrupts off, just in case. */
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MCCLOCK_WRITE(dev, MC_REGB, MC_REGB_BINARY | MC_REGB_24HR);
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clockattach(dev);
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}
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void
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mcclock_init(device_t dev)
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{
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MCCLOCK_WRITE(dev, MC_REGA, MC_BASE_32_KHz | MC_DEFAULTRATE);
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MCCLOCK_WRITE(dev, MC_REGB,
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MC_REGB_PIE | MC_REGB_SQWE | MC_REGB_BINARY | MC_REGB_24HR);
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}
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/*
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* Get the time of day, based on the clock's value and/or the base value.
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*/
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void
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mcclock_get(device_t dev, time_t base, struct clocktime *ct)
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{
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mc_todregs regs;
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int s;
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s = splclock();
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MC146818_GETTOD(dev, ®s)
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splx(s);
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ct->sec = regs[MC_SEC];
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ct->min = regs[MC_MIN];
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ct->hour = regs[MC_HOUR];
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ct->dow = regs[MC_DOW];
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ct->day = regs[MC_DOM];
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ct->mon = regs[MC_MONTH];
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ct->year = regs[MC_YEAR];
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}
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/*
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* Reset the TODR based on the time value.
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*/
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void
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mcclock_set(device_t dev, struct clocktime *ct)
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{
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mc_todregs regs;
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int s;
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s = splclock();
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MC146818_GETTOD(dev, ®s);
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splx(s);
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regs[MC_SEC] = ct->sec;
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regs[MC_MIN] = ct->min;
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regs[MC_HOUR] = ct->hour;
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regs[MC_DOW] = ct->dow;
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regs[MC_DOM] = ct->day;
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regs[MC_MONTH] = ct->mon;
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regs[MC_YEAR] = ct->year;
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s = splclock();
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MC146818_PUTTOD(dev, ®s);
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splx(s);
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}
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