162 lines
4.2 KiB
C
162 lines
4.2 KiB
C
/* $NetBSD: ofwgencfg_clock.c,v 1.8 2008/01/20 16:28:23 joerg Exp $ */
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/*
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* Copyright 1997
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* Digital Equipment Corporation. All rights reserved.
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*
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* This software is furnished under license and may be used and
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* copied only in accordance with the following terms and conditions.
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* Subject to these conditions, you may download, copy, install,
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* use, modify and distribute this software in source and/or binary
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* form. No title or ownership is transferred hereby.
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*
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* 1) Any source code used, modified or distributed must reproduce
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* and retain this copyright notice and list of conditions as
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* they appear in the source file.
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*
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* 2) No right is granted to use any trade name, trademark, or logo of
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* Digital Equipment Corporation. Neither the "Digital Equipment
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* Corporation" name nor any trademark or logo of Digital Equipment
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* Corporation may be used to endorse or promote products derived
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* from this software without the prior written permission of
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* Digital Equipment Corporation.
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*
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* 3) This software is provided "AS-IS" and any express or implied
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* warranties, including but not limited to, any implied warranties
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* of merchantability, fitness for a particular purpose, or
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* non-infringement are disclaimed. In no event shall DIGITAL be
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* liable for any damages whatsoever, and in particular, DIGITAL
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* shall not be liable for special, indirect, consequential, or
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* incidental damages or damages for lost profits, loss of
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* revenue or loss of use, whether such damages arise in contract,
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* negligence, tort, under statute, in equity, at law or otherwise,
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* even if advised of the possibility of such damage.
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*/
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/* Include header files */
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: ofwgencfg_clock.c,v 1.8 2008/01/20 16:28:23 joerg Exp $");
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/time.h>
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#include <machine/intr.h>
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#include <machine/irqhandler.h>
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#include <arm/cpufunc.h>
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#include <machine/cpu.h>
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#include <machine/ofw.h>
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static void *clockirq;
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/*
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* int clockhandler(struct clockframe *frame)
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*
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* Function called by timer 0 interrupts. This just calls
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* hardclock(). Eventually the irqhandler can call hardclock() directly
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* but for now we use this function so that we can debug IRQ's
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*/
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static int
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clockhandler(struct clockframe *frame)
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{
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hardclock(frame);
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return(0); /* Pass the interrupt on down the chain */
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}
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#if 0
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/*
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* int statclockhandler(struct clockframe *frame)
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*
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* Function called by timer 1 interrupts. This just calls
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* statclock(). Eventually the irqhandler can call statclock() directly
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* but for now we use this function so that we can debug IRQ's
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*/
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int
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statclockhandler(frame)
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struct clockframe *frame;
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{
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statclock(frame);
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return(0); /* Pass the interrupt on down the chain */
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}
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#endif
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/*
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* void setstatclockrate(int hz)
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*
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* Set the stat clock rate. The stat clock uses timer1
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*/
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void
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setstatclockrate(int arg)
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{
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#ifdef OFWGENCFG
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printf("Not setting statclock: OFW generic has only one clock.\n");
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#endif
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}
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/*
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* void cpu_initclocks(void)
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*
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* Initialise the clocks.
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* This sets up the two timers in the IOMD and installs the IRQ handlers
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*
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* NOTE: Currently only timer 0 is setup and the IRQ handler is not installed
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*/
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void
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cpu_initclocks()
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{
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/*
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* Load timer 0 with count down value
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* This timer generates 100Hz interrupts for the system clock
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*/
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printf("clock: hz=%d stathz = %d profhz = %d\n", hz, stathz, profhz);
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clockirq = intr_claim(IRQ_TIMER0, IPL_CLOCK,
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(int (*)(void *))clockhandler, 0, "clock", "hard intr");
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if (clockirq == NULL)
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panic("Cannot installer timer 0 IRQ handler");
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/* Notify callback handler that it can start processing ticks. */
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ofw_handleticks = 1;
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if (stathz) {
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printf("Not installing statclock: OFW generic has only one clock.\n");
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}
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}
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/*
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* Estimated loop for n microseconds
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*/
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/* Need to re-write this to use the timers */
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/* One day soon I will actually do this */
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int delaycount = 50;
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void
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delay(n)
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u_int n;
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{
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u_int i;
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if (n == 0) return;
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while (n-- > 0) {
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if (cputype == CPU_ID_SA110) /* XXX - Seriously gross hack */
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for (i = delaycount; --i;);
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else
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for (i = 8; --i;);
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}
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}
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