258 lines
6.3 KiB
C
258 lines
6.3 KiB
C
/* $NetBSD: clock.c,v 1.24 2011/01/18 01:02:53 matt Exp $ */
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/* $OpenBSD: clock.c,v 1.3 1997/10/13 13:42:53 pefo Exp $ */
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/*
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* Copyright (C) 1995, 1996 Wolfgang Solfrank.
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* Copyright (C) 1995, 1996 TooLs GmbH.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by TooLs GmbH.
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* 4. The name of TooLs GmbH may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: clock.c,v 1.24 2011/01/18 01:02:53 matt Exp $");
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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/timetc.h>
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#include <uvm/uvm_extern.h>
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#include <prop/proplib.h>
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#include <machine/cpu.h>
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#include <powerpc/spr.h>
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#include <powerpc/ibm4xx/spr.h>
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/*
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* Initially we assume a processor with a bus frequency of 12.5 MHz.
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*/
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static u_long ticks_per_sec;
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static u_long ns_per_tick;
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static long ticks_per_intr;
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static volatile u_long lasttb, lasttb2;
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static u_long ticksmissed;
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static volatile int tickspending;
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static void init_ppc4xx_tc(void);
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static u_int get_ppc4xx_timecount(struct timecounter *);
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static struct timecounter ppc4xx_timecounter = {
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get_ppc4xx_timecount, /* get_timecount */
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0, /* no poll_pps */
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~0u, /* counter_mask */
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0, /* frequency */
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"ppc_timebase", /* name */
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100, /* quality */
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NULL, /* tc_priv */
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NULL /* tc_next */
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};
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void decr_intr(struct clockframe *); /* called from trap_subr.S */
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void stat_intr(struct clockframe *); /* called from trap_subr.S */
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#ifdef FAST_STAT_CLOCK
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/* Stat clock runs at ~ 1.5 kHz */
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#define PERIOD_POWER 17
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#define TCR_PERIOD TCR_FP_2_17
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#else
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/* Stat clock runs at ~ 95Hz */
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#define PERIOD_POWER 21
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#define TCR_PERIOD TCR_FP_2_21
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#endif
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void
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stat_intr(struct clockframe *frame)
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{
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struct cpu_info * const ci = curcpu();
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mtspr(SPR_TSR, TSR_FIS); /* Clear TSR[FIS] */
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ci->ci_data.cpu_nintr++;
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ci->ci_ev_statclock.ev_count++;
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/* Nobody can interrupt us, but see if we're allowed to run. */
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if (! (ci->ci_cpl & mask_statclock))
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statclock(frame);
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}
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void
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decr_intr(struct clockframe *frame)
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{
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struct cpu_info * const ci = curcpu();
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int pri;
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long tbtick, xticks;
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int nticks;
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/*
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* Check whether we are initialized.
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*/
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if (!ticks_per_intr)
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return;
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tbtick = mftbl();
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mtspr(SPR_TSR, TSR_PIS); /* Clear TSR[PIS] */
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xticks = tbtick - lasttb2; /* Number of TLB cycles since last exception */
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for (nticks = 0; xticks > ticks_per_intr; nticks++)
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xticks -= ticks_per_intr;
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lasttb2 = tbtick - xticks;
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ci->ci_data.cpu_nintr++;
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ci->ci_ev_clock.ev_count++;
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pri = splclock();
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if (pri & mask_clock) {
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tickspending += nticks;
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ticksmissed += nticks;
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} else {
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nticks += tickspending;
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tickspending = 0;
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/*
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* lasttb is used during microtime. Set it to the virtual
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* start of this tick interval.
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*/
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lasttb = lasttb2;
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/*
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* Reenable interrupts
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*/
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__asm volatile ("wrteei 1");
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/*
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* Do standard timer interrupt stuff.
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* Do softclock stuff only on the last iteration.
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*/
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while (--nticks > 0)
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hardclock(frame);
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hardclock(frame);
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}
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splx(pri);
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}
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void
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cpu_initclocks(void)
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{
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struct cpu_info * const ci = curcpu();
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/* Initialized in powerpc/ibm4xx/cpu.c */
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evcnt_attach_static(&ci->ci_ev_clock);
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evcnt_attach_static(&ci->ci_ev_statclock);
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ticks_per_intr = ticks_per_sec / hz;
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stathz = profhz = ticks_per_sec / (1 << PERIOD_POWER);
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printf("Setting PIT to %ld/%d = %ld\n", ticks_per_sec, hz,
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ticks_per_intr);
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lasttb2 = lasttb = mftbl();
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mtspr(SPR_PIT, ticks_per_intr);
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/* Enable PIT & FIT(2^17c = 0.655ms) interrupts and auto-reload */
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mtspr(SPR_TCR, TCR_PIE | TCR_ARE | TCR_FIE | TCR_PERIOD);
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init_ppc4xx_tc();
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}
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void
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calc_delayconst(void)
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{
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prop_number_t freq;
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freq = prop_dictionary_get(board_properties, "processor-frequency");
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KASSERT(freq != NULL);
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ticks_per_sec = (u_long) prop_number_integer_value(freq);
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ns_per_tick = 1000000000 / ticks_per_sec;
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}
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static u_int
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get_ppc4xx_timecount(struct timecounter *tc)
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{
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u_long tb;
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int msr;
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__asm volatile ("mfmsr %0; wrteei 0" : "=r"(msr) :);
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tb = mftbl();
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__asm volatile ("mtmsr %0" :: "r"(msr));
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return tb;
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}
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/*
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* Wait for about n microseconds (at least!).
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*/
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void
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delay(unsigned int n)
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{
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u_quad_t tb;
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u_long tbh, tbl, scratch;
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tb = mftb();
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/* use 1000ULL to force 64 bit math to avoid 32 bit overflows */
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tb += (n * 1000ULL + ns_per_tick - 1) / ns_per_tick;
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tbh = tb >> 32;
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tbl = tb;
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__asm volatile (
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#ifdef PPC_IBM403
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"1: mftbhi %0 \n"
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#else
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"1: mftbu %0 \n"
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#endif
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" cmplw %0,%1 \n"
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" blt 1b \n"
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" bgt 2f \n"
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#ifdef PPC_IBM403
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" mftblo %0 \n"
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#else
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" mftb %0 \n"
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#endif
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" cmplw %0,%2 \n"
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" blt 1b \n"
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"2: \n"
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: "=&r"(scratch) : "r"(tbh), "r"(tbl) : "cr0");
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}
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/*
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* Nothing to do.
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*/
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void
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setstatclockrate(int arg)
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{
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/* Do nothing */
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}
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static void
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init_ppc4xx_tc(void)
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{
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/* from machdep initialization */
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ppc4xx_timecounter.tc_frequency = ticks_per_sec;
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tc_init(&ppc4xx_timecounter);
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}
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