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Make timebase frequency value adjustable.

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This commit is contained in:
tsubai 2000-07-14 05:53:31 +00:00
parent 9bdf22f648
commit 500013914e
1 changed files with 32 additions and 20 deletions
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52
sys/arch/macppc/macppc/clock.c
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@ -1,4 +1,4 @@
/* $NetBSD: clock.c,v 1.10 2000/06/29 08:10:45 mrg Exp $ */ /* $NetBSD: clock.c,v 1.11 2000/07/14 05:53:31 tsubai Exp $ */
/* /*
* Copyright (C) 1995, 1996 Wolfgang Solfrank. * Copyright (C) 1995, 1996 Wolfgang Solfrank.
@ -43,13 +43,19 @@
#include "adb.h" #include "adb.h"
/* /*
* Initially we assume a processor with a bus frequency of 12.5 MHz. * Initially we assume a processor with a bus frequency of 50 MHz.
*/ */
static u_long ticks_per_sec = 12500000; static u_long ticks_per_sec = 50*1000*1000/4;
static u_long ns_per_tick = 80; static u_long ns_per_tick = 80;
static long ticks_per_intr; static long ticks_per_intr;
static volatile u_long lasttb; static volatile u_long lasttb;
#ifdef TIMEBASE_FREQ
u_int timebase_freq = TIMEBASE_FREQ;
#else
u_int timebase_freq = 0;
#endif
#define SECDAY 86400 #define SECDAY 86400
#define DIFF19041970 2082844800 #define DIFF19041970 2082844800
@ -178,28 +184,23 @@ void
calc_delayconst() calc_delayconst()
{ {
int qhandle, phandle; int qhandle, phandle;
char name[32]; char type[32];
int msr, scratch; int msr, scratch;
/* /*
* Get this info during autoconf? XXX * Get this info during autoconf? XXX
*/ */
if (timebase_freq != 0) {
ticks_per_sec = timebase_freq;
goto found;
}
for (qhandle = OF_peer(0); qhandle; qhandle = phandle) { for (qhandle = OF_peer(0); qhandle; qhandle = phandle) {
if (OF_getprop(qhandle, "device_type", name, sizeof name) >= 0 if (OF_getprop(qhandle, "device_type", type, sizeof type) > 0
&& !strcmp(name, "cpu") && strcmp(type, "cpu") == 0
&& OF_getprop(qhandle, "timebase-frequency", && OF_getprop(qhandle, "timebase-frequency",
&ticks_per_sec, sizeof ticks_per_sec) >= 0) { &ticks_per_sec, sizeof ticks_per_sec) > 0) {
/* goto found;
* Should check for correct CPU here? XXX
*/
asm volatile ("mfmsr %0; andi. %1, %0, %2; mtmsr %1"
: "=r"(msr), "=r"(scratch) : "K"((u_short)~PSL_EE));
ns_per_tick = 1000000000 / ticks_per_sec;
ticks_per_intr = ticks_per_sec / hz;
asm volatile ("mftb %0" : "=r"(lasttb));
asm volatile ("mtdec %0" :: "r"(ticks_per_intr));
asm volatile ("mtmsr %0" :: "r"(msr));
break;
} }
if ((phandle = OF_child(qhandle))) if ((phandle = OF_child(qhandle)))
continue; continue;
@ -209,8 +210,19 @@ calc_delayconst()
qhandle = OF_parent(qhandle); qhandle = OF_parent(qhandle);
} }
} }
if (!phandle) panic("no cpu node");
panic("no cpu node");
found:
/*
* Should check for correct CPU here? XXX
*/
asm volatile ("mfmsr %0; andi. %1,%0,%2; mtmsr %1"
: "=r"(msr), "=r"(scratch) : "K"((u_short)~PSL_EE));
ns_per_tick = 1000000000 / ticks_per_sec;
ticks_per_intr = ticks_per_sec / hz;
asm volatile ("mftb %0" : "=r"(lasttb));
asm volatile ("mtdec %0" :: "r"(ticks_per_intr));
asm volatile ("mtmsr %0" :: "r"(msr));
} }
static inline u_quad_t static inline u_quad_t