NetBSD-5.0.2/sys/arch/x68k/x68k/clock.c
/* $NetBSD: clock.c,v 1.28 2008/06/25 08:14:59 isaki Exp $ */
/*
* Copyright (c) 1982, 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* the Systems Programming Group of the University of Utah Computer
* Science Department.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: Utah $Hdr: clock.c 1.18 91/01/21$
*
* @(#)clock.c 8.2 (Berkeley) 1/12/94
*/
/*
* Copyright (c) 1988 University of Utah.
*
* This code is derived from software contributed to Berkeley by
* the Systems Programming Group of the University of Utah Computer
* Science Department.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: Utah $Hdr: clock.c 1.18 91/01/21$
*
* @(#)clock.c 8.2 (Berkeley) 1/12/94
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: clock.c,v 1.28 2008/06/25 08:14:59 isaki Exp $");
#include "clock.h"
#if NCLOCK > 0
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/timetc.h>
#include <machine/psl.h>
#include <machine/cpu.h>
#include <machine/bus.h>
#include <dev/clock_subr.h>
#include <arch/x68k/dev/mfp.h>
#include <arch/x68k/dev/rtclock_var.h>
static int clock_match(device_t, cfdata_t, void *);
static void clock_attach(device_t, device_t, void *);
CFATTACH_DECL_NEW(clock, 0,
clock_match, clock_attach, NULL, NULL);
static int clock_attached;
static unsigned mfp_get_timecount(struct timecounter *);
static int
clock_match(device_t parent, cfdata_t cf, void *aux)
{
if (strcmp (aux, "clock") != 0)
return (0);
if (clock_attached)
return (0);
return 1;
}
static void
clock_attach(device_t parent, device_t self, void *aux)
{
clock_attached = 1;
aprint_normal(": MFP timer C\n");
}
/*
* MFP of X68k uses 4MHz clock always and we use 1/200 prescaler here.
* Therefore, clock interval is 50 usec.
*
* Note that for timecounters, we'd like to use a finger grained clock, but
* since we only have an 8-bit clock, we can't do that without increasing
* the system clock rate. (Otherwise the counter would roll in less than
* a single system clock.)
*/
#define CLK_RESOLUTION (50)
#define CLOCKS_PER_SEC (1000000 / CLK_RESOLUTION)
/*
* Machine-dependent clock routines.
*
* Startrtclock restarts the real-time clock, which provides
* hardclock interrupts to kern_clock.c.
*
* A note on the real-time clock:
* We actually load the clock with CLK_INTERVAL-1 instead of CLK_INTERVAL.
* This is because the counter decrements to zero after N+1 enabled clock
* periods where N is the value loaded into the counter.
*/
/*
* Set up the real-time and statistics clocks. Leave stathz 0 only if
* no alternative timer is available.
*
*/
void
cpu_initclocks(void)
{
static struct timecounter tc = {
.tc_name = "mfp",
.tc_frequency = CLOCKS_PER_SEC,
.tc_counter_mask = 0xff,
.tc_get_timecount = mfp_get_timecount,
.tc_quality = 100,
};
if (CLOCKS_PER_SEC % hz ||
hz <= (CLOCKS_PER_SEC / 256) || hz > CLOCKS_PER_SEC) {
printf("cannot set %d Hz clock. using 100 Hz\n", hz);
hz = 100;
}
mfp_set_tcdcr(0); /* stop timers C and D */
mfp_set_tcdcr(mfp_get_tcdcr() | 0x70); /* 1/200 delay mode */
mfp_set_tcdr(CLOCKS_PER_SEC / hz);
mfp_bit_set_ierb(MFP_INTR_TIMER_C);
mfp_set_tddr(0xff); /* maximum free run -- only 8 bits wide */
mfp_set_tcdcr(mfp_get_tcdcr() | 0x07); /* 1/200 prescaler */
tc_init(&tc);
}
/*
* We assume newhz is either stathz or profhz, and that neither will
* change after being set up above. Could recalculate intervals here
* but that would be a drag.
*/
void
setstatclockrate(int newhz)
{
}
/*
* Returns number of usec since last recorded clock "tick"
* (i.e. clock interrupt).
*/
unsigned
mfp_get_timecount(struct timecounter *tc)
{
uint8_t val;
val = ~(mfp_get_tddr());
return (val);
}
#if 0
void
DELAY(mic)
int mic;
{
u_long n;
short hpos;
/*
* busy-poll for mic microseconds. This is *no* general timeout function,
* it's meant for timing in hardware control, and as such, may not lower
* interrupt priorities to really `sleep'.
*/
/*
* this function uses HSync pulses as base units. The custom chips
* display only deals with 31.6kHz/2 refresh, this gives us a
* resolution of 1/15800 s, which is ~63us (add some fuzz so we really
* wait awhile, even if using small timeouts)
*/
n = mic/32 + 2;
do {
while ((mfp.gpip & MFP_GPIP_HSYNC) != 0)
__asm("nop");
while ((mfp.gpip & MFP_GPIP_HSYNC) == 0)
__asm("nop");
} while (n--);
}
#endif
#if notyet
/* implement this later. I'd suggest using both timers in CIA-A, they're
not yet used. */
/*
* /dev/clock: mappable high resolution timer.
*
* This code implements a 32-bit recycling counter (with a 4 usec period)
* using timers 2 & 3 on the 6840 clock chip. The counter can be mapped
* RO into a user's address space to achieve low overhead (no system calls),
* high-precision timing.
*
* Note that timer 3 is also used for the high precision profiling timer
* (PROFTIMER code above). Care should be taken when both uses are
* configured as only a token effort is made to avoid conflicting use.
*/
#include <sys/proc.h>
#include <sys/resourcevar.h>
#include <sys/ioctl.h>
#include <sys/malloc.h>
#include <uvm/uvm_extern.h> /* XXX needed? */
#include <x68k/x68k/clockioctl.h>
#include <sys/specdev.h>
#include <sys/vnode.h>
#include <sys/mman.h>
int clockon = 0; /* non-zero if high-res timer enabled */
#ifdef PROFTIMER
int profprocs = 0; /* # of procs using profiling timer */
#endif
#ifdef DEBUG
int clockdebug = 0;
#endif
/*ARGSUSED*/
int
clockopen(dev_t dev, int flags)
{
#ifdef PROFTIMER
#ifdef PROF
/*
* Kernel profiling enabled, give up.
*/
if (profiling)
return(EBUSY);
#endif /* PROF */
/*
* If any user processes are profiling, give up.
*/
if (profprocs)
return(EBUSY);
#endif /* PROFTIMER */
if (!clockon) {
startclock();
clockon++;
}
return(0);
}
/*ARGSUSED*/
int
clockclose(dev_t dev, int flags)
{
(void) clockunmmap(dev, NULL, curproc); /* XXX */
stopclock();
clockon = 0;
return(0);
}
/*ARGSUSED*/
int
clockioctl(dev_t dev, u_long cmd, void *data, int flag, struct proc *p)
{
int error = 0;
switch (cmd) {
case CLOCKMAP:
error = clockmmap(dev, (void **)data, p);
break;
case CLOCKUNMAP:
error = clockunmmap(dev, *(void **)data, p);
break;
case CLOCKGETRES:
*(int *)data = CLK_RESOLUTION;
break;
default:
error = EINVAL;
break;
}
return(error);
}
/*ARGSUSED*/
int
clockmap(dev_t dev, off_t off, int prot)
{
return ((off + (INTIOBASE + CLKBASE + CLKSR - 1)) >> PGSHIFT);
}
int
clockmmap(dev_t dev, void **addrp, struct proc *p)
{
int error;
struct vnode vn;
struct specinfo si;
int flags;
flags = MAP_FILE|MAP_SHARED;
if (*addrp)
flags |= MAP_FIXED;
else
*addrp = (void *)0x1000000; /* XXX */
vn.v_type = VCHR; /* XXX */
vn.v_specinfo = &si; /* XXX */
vn.v_rdev = dev; /* XXX */
error = vm_mmap(&p->p_vmspace->vm_map, (vaddr_t *)addrp,
PAGE_SIZE, VM_PROT_ALL, flags, (void *)&vn, 0);
return(error);
}
int
clockunmmap(dev_t dev, void *addr, struct proc *p)
{
int rv;
if (addr == 0)
return(EINVAL); /* XXX: how do we deal with this? */
uvm_deallocate(p->p_vmspace->vm_map, (vaddr_t)addr, PAGE_SIZE);
return 0;
}
void
startclock(void)
{
struct clkreg *clk = (struct clkreg *)clkstd[0];
clk->clk_msb2 = -1; clk->clk_lsb2 = -1;
clk->clk_msb3 = -1; clk->clk_lsb3 = -1;
clk->clk_cr2 = CLK_CR3;
clk->clk_cr3 = CLK_OENAB|CLK_8BIT;
clk->clk_cr2 = CLK_CR1;
clk->clk_cr1 = CLK_IENAB;
}
void
stopclock(void)
{
struct clkreg *clk = (struct clkreg *)clkstd[0];
clk->clk_cr2 = CLK_CR3;
clk->clk_cr3 = 0;
clk->clk_cr2 = CLK_CR1;
clk->clk_cr1 = CLK_IENAB;
}
#endif /* notyet */
#ifdef PROFTIMER
/*
* This code allows the amiga kernel to use one of the extra timers on
* the clock chip for profiling, instead of the regular system timer.
* The advantage of this is that the profiling timer can be turned up to
* a higher interrupt rate, giving finer resolution timing. The profclock
* routine is called from the lev6intr in locore, and is a specialized
* routine that calls addupc. The overhead then is far less than if
* hardclock/softclock was called. Further, the context switch code in
* locore has been changed to turn the profile clock on/off when switching
* into/out of a process that is profiling (startprofclock/stopprofclock).
* This reduces the impact of the profiling clock on other users, and might
* possibly increase the accuracy of the profiling.
*/
int profint = PRF_INTERVAL; /* Clock ticks between interrupts */
int profscale = 0; /* Scale factor from sys clock to prof clock */
char profon = 0; /* Is profiling clock on? */
/* profon values - do not change, locore.s assumes these values */
#define PRF_NONE 0x00
#define PRF_USER 0x01
#define PRF_KERNEL 0x80
void
initprofclock(void)
{
struct proc *p = curproc; /* XXX */
/*
* If the high-res timer is running, force profiling off.
* Unfortunately, this gets reflected back to the user not as
* an error but as a lack of results.
*/
if (clockon) {
p->p_stats->p_prof.pr_scale = 0;
return;
}
/*
* Keep track of the number of user processes that are profiling
* by checking the scale value.
*
* XXX: this all assumes that the profiling code is well behaved;
* i.e. profil() is called once per process with pcscale non-zero
* to turn it on, and once with pcscale zero to turn it off.
* Also assumes you don't do any forks or execs. Oh well, there
* is always adb...
*/
if (p->p_stats->p_prof.pr_scale)
profprocs++;
else
profprocs--;
/*
* The profile interrupt interval must be an even divisor
* of the CLK_INTERVAL so that scaling from a system clock
* tick to a profile clock tick is possible using integer math.
*/
if (profint > CLK_INTERVAL || (CLK_INTERVAL % profint) != 0)
profint = CLK_INTERVAL;
profscale = CLK_INTERVAL / profint;
}
void
startprofclock(void)
{
}
void
stopprofclock(void)
{
}
#ifdef PROF
/*
* profclock() is expanded in line in lev6intr() unless profiling kernel.
* Assumes it is called with clock interrupts blocked.
*/
void
profclock(void *pc, int ps)
{
/*
* Came from user mode.
* If this process is being profiled record the tick.
*/
if (USERMODE(ps)) {
if (p->p_stats.p_prof.pr_scale)
addupc(pc, &curproc->p_stats.p_prof, 1);
}
/*
* Came from kernel (supervisor) mode.
* If we are profiling the kernel, record the tick.
*/
else if (profiling < 2) {
int s = pc - s_lowpc;
if (s < s_textsize)
kcount[s / (HISTFRACTION * sizeof (*kcount))]++;
}
/*
* Kernel profiling was on but has been disabled.
* Mark as no longer profiling kernel and if all profiling done,
* disable the clock.
*/
if (profiling && (profon & PRF_KERNEL)) {
profon &= ~PRF_KERNEL;
if (profon == PRF_NONE)
stopprofclock();
}
}
#endif /* PROF */
#endif /* PROFTIMER */
#else /* NCLOCK */
#error loose.
#endif