File: [local] / sys / arch / alpha / alpha / clock.c (download)
Revision 1.1.1.1 (vendor branch), Tue Mar 4 16:04:40 2008 UTC (16 years, 3 months ago) by nbrk
Branch: OPENBSD_4_2_BASE, MAIN
CVS Tags: jornada-partial-support-wip, HEAD Changes since 1.1: +0 -0 lines
Import of OpenBSD 4.2 release kernel tree with initial code to support
Jornada 720/728, StrongARM 1110-based handheld PC.
At this point kernel roots on NFS and boots into vfs_mountroot() and traps.
What is supported:
- glass console, Jornada framebuffer (jfb) works in 16bpp direct color mode
(needs some palette tweaks for non black/white/blue colors, i think)
- saic, SA11x0 interrupt controller (needs cleanup)
- sacom, SA11x0 UART (supported only as boot console for now)
- SA11x0 GPIO controller fully supported (but can't handle multiple interrupt
handlers on one gpio pin)
- sassp, SSP port on SA11x0 that attaches spibus
- Jornada microcontroller (jmcu) to control kbd, battery, etc throught
the SPI bus (wskbd attaches on jmcu, but not tested)
- tod functions seem work
- initial code for SA-1111 (chip companion) : this is TODO
Next important steps, i think:
- gpio and intc on sa1111
- pcmcia support for sa11x0 (and sa1111 help logic)
- REAL root on nfs when we have PCMCIA support (we may use any of supported pccard NICs)
- root on wd0! (using already supported PCMCIA-ATA)
|
/* $OpenBSD: clock.c,v 1.18 2007/04/30 04:35:05 miod Exp $ */
/* $NetBSD: clock.c,v 1.29 2000/06/05 21:47:10 thorpej Exp $ */
/*
* Copyright (c) 1988 University of Utah.
* Copyright (c) 1992, 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 and Ralph Campbell.
*
* 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 8.1 (Berkeley) 6/10/93
*/
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/evcount.h>
#include <sys/timetc.h>
#include <dev/clock_subr.h>
#include <machine/rpb.h>
#include <machine/autoconf.h>
#include <machine/cpuconf.h>
#include <alpha/alpha/clockvar.h>
#define MINYEAR 1998 /* "today" */
#ifdef CLOCK_COMPAT_OSF1
/*
* According to OSF/1's /usr/sys/include/arch/alpha/clock.h,
* the console adjusts the RTC years 13..19 to 93..99 and
* 20..40 to 00..20. (historical reasons?)
* DEC Unix uses an offset to the year to stay outside
* the dangerous area for the next couple of years.
*/
#define UNIX_YEAR_OFFSET 52 /* 41=>1993, 12=>2064 */
#else
#define UNIX_YEAR_OFFSET 0
#endif
extern int schedhz;
struct device *clockdev;
const struct clockfns *clockfns;
int clockinitted;
struct evcount clk_count;
int clk_irq = 0;
u_int rpcc_get_timecount(struct timecounter *);
struct timecounter rpcc_timecounter = {
rpcc_get_timecount, NULL, ~0u, 0, "rpcc", 0, NULL
};
void
clockattach(dev, fns)
struct device *dev;
const struct clockfns *fns;
{
/*
* Just bookkeeping.
*/
printf("\n");
if (clockfns != NULL)
panic("clockattach: multiple clocks");
clockdev = dev;
clockfns = fns;
}
/*
* Machine-dependent clock routines.
*
* Startrtclock restarts the real-time clock, which provides
* hardclock interrupts to kern_clock.c.
*
* Inittodr initializes the time of day hardware which provides
* date functions. Its primary function is to use some file
* system information in case the hardware clock lost state.
*
* Resettodr restores the time of day hardware after a time change.
*/
/*
* Start the real-time and statistics clocks. Leave stathz 0 since there
* are no other timers available.
*/
void
cpu_initclocks(void)
{
u_int32_t cycles_per_sec;
struct clocktime ct;
u_int32_t first_rpcc, second_rpcc; /* only lower 32 bits are valid */
int first_sec;
if (clockfns == NULL)
panic("cpu_initclocks: no clock attached");
tick = 1000000 / hz; /* number of microseconds between interrupts */
/*
* Establish the clock interrupt; it's a special case.
*
* We establish the clock interrupt this late because if
* we do it at clock attach time, we may have never been at
* spl0() since taking over the system. Some versions of
* PALcode save a clock interrupt, which would get delivered
* when we spl0() in autoconf.c. If established the clock
* interrupt handler earlier, that interrupt would go to
* hardclock, which would then fall over because p->p_stats
* isn't set at that time.
*/
platform.clockintr = hardclock;
schedhz = 16;
evcount_attach(&clk_count, "clock", (void *)&clk_irq, &evcount_intr);
/*
* Get the clock started.
*/
(*clockfns->cf_init)(clockdev);
/*
* Calibrate the cycle counter frequency.
*/
(*clockfns->cf_get)(clockdev, 0, &ct);
first_sec = ct.sec;
/* Let the clock tick one second. */
do {
first_rpcc = alpha_rpcc();
(*clockfns->cf_get)(clockdev, 0, &ct);
} while (ct.sec == first_sec);
first_sec = ct.sec;
/* Let the clock tick one more second. */
do {
second_rpcc = alpha_rpcc();
(*clockfns->cf_get)(clockdev, 0, &ct);
} while (ct.sec == first_sec);
cycles_per_sec = second_rpcc - first_rpcc;
rpcc_timecounter.tc_frequency = cycles_per_sec;
tc_init(&rpcc_timecounter);
}
/*
* 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(newhz)
int newhz;
{
/* nothing we can do */
}
/*
* Initialize the time of day register, based on the time base which is, e.g.
* from a filesystem. Base provides the time to within six months,
* and the time of year clock (if any) provides the rest.
*/
void
inittodr(time_t base)
{
struct clocktime ct;
int year;
struct clock_ymdhms dt;
time_t deltat;
int badbase;
struct timespec ts;
ts.tv_sec = ts.tv_nsec = 0;
if (base < (MINYEAR-1970)*SECYR) {
printf("WARNING: preposterous time in file system");
/* read the system clock anyway */
base = (MINYEAR-1970)*SECYR;
badbase = 1;
} else
badbase = 0;
(*clockfns->cf_get)(clockdev, base, &ct);
#ifdef DEBUG
printf("readclock: %d/%d/%d/%d/%d/%d", ct.year, ct.mon, ct.day,
ct.hour, ct.min, ct.sec);
#endif
clockinitted = 1;
year = 1900 + UNIX_YEAR_OFFSET + ct.year;
if (year < 1970)
year += 100;
/* simple sanity checks (2037 = time_t overflow) */
if (year < MINYEAR || year > 2037 ||
ct.mon < 1 || ct.mon > 12 || ct.day < 1 ||
ct.day > 31 || ct.hour > 23 || ct.min > 59 || ct.sec > 59) {
/*
* Believe the time in the file system for lack of
* anything better, resetting the TODR.
*/
ts.tv_sec = base;
if (!badbase) {
printf("WARNING: preposterous clock chip time\n");
resettodr();
}
goto bad;
}
dt.dt_year = year;
dt.dt_mon = ct.mon;
dt.dt_day = ct.day;
dt.dt_hour = ct.hour;
dt.dt_min = ct.min;
dt.dt_sec = ct.sec;
ts.tv_sec = clock_ymdhms_to_secs(&dt);
#ifdef DEBUG
printf("=>%ld (%d)\n", ts.tv_sec, base);
#endif
if (!badbase) {
/*
* See if we gained/lost two or more days;
* if so, assume something is amiss.
*/
deltat = ts.tv_sec - base;
if (deltat < 0)
deltat = -deltat;
if (deltat < 2 * SECDAY) {
tc_setclock(&ts);
return;
}
printf("WARNING: clock %s %ld days",
ts.tv_sec < base ? "lost" : "gained",
(long)deltat / SECDAY);
}
bad:
tc_setclock(&ts);
printf(" -- CHECK AND RESET THE DATE!\n");
}
/*
* Reset the TODR based on the time value; used when the TODR
* has a preposterous value and also when the time is reset
* by the stime system call. Also called when the TODR goes past
* TODRZERO + 100*(SECYEAR+2*SECDAY) (e.g. on Jan 2 just after midnight)
* to wrap the TODR around.
*/
void
resettodr()
{
struct clock_ymdhms dt;
struct clocktime ct;
if (!clockinitted)
return;
clock_secs_to_ymdhms(time_second, &dt);
/* rt clock wants 2 digits */
ct.year = (dt.dt_year - UNIX_YEAR_OFFSET) % 100;
ct.mon = dt.dt_mon;
ct.day = dt.dt_day;
ct.hour = dt.dt_hour;
ct.min = dt.dt_min;
ct.sec = dt.dt_sec;
ct.dow = dt.dt_wday;
#ifdef DEBUG
printf("setclock: %d/%d/%d/%d/%d/%d\n", ct.year, ct.mon, ct.day,
ct.hour, ct.min, ct.sec);
#endif
(*clockfns->cf_set)(clockdev, &ct);
}
u_int
rpcc_get_timecount(struct timecounter *tc)
{
return alpha_rpcc();
}