NetBSD-5.0.2/sys/arch/sun2/sun2/clock.c
/* $NetBSD: clock.c,v 1.15 2008/07/06 13:29:50 tsutsui 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$
* from: @(#)clock.c 8.2 (Berkeley) 1/12/94
*/
/*
* Copyright (c) 2001 Matthew Fredette
* Copyright (c) 1994 Gordon W. Ross
* Copyright (c) 1993 Adam Glass
* 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$
* from: @(#)clock.c 8.2 (Berkeley) 1/12/94
*/
/*
* Machine-dependent clock routines for the Am9513
* Written by Matthew Fredette, based on the sun3 clock.c by
* Adam Glass and Gordon Ross.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: clock.c,v 1.15 2008/07/06 13:29:50 tsutsui Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <machine/autoconf.h>
#include <machine/cpu.h>
#include <machine/frame.h>
#include <machine/leds.h>
#include <sun2/sun2/control.h>
#include <sun2/sun2/enable.h>
#include <sun2/sun2/machdep.h>
#include <dev/clock_subr.h>
#include <dev/ic/am9513reg.h>
/*
* Carefully define the basic CPU clock rate so
* that time-of-day calculations don't float
*
* Note that the CLK_BASIC is divided by 4 before we can count with it,
* e.g. F1 ticks CLK_BASIC/4 times a second.
*/
#define SUN2_CLK_BASIC (19660800)
#define SUN2_CLK_TICKS(func, hz) \
(((SUN2_CLK_BASIC / 4) / AM9513_CM_SOURCE_Fn_DIV(func)) / (hz))
/* These define which counters are used for what. */
#define SUN2_CLK_NMI AM9513_TIMER1 /* Non Maskable Interrupts */
#define SUN2_CLK_TIMER AM9513_TIMER2 /* Timer 2 */
#define SUN2_CLK_UNUSED AM9513_TIMER3 /* Unused timer */
#define SUN2_CLK_FAST_LO AM9513_TIMER4 /* Timer 4 for realtime, low order */
#define SUN2_CLK_FAST_HI AM9513_TIMER5 /* Timer 5 for realtime, high order */
#define CLOCK_PRI 5
#define IREG_CLK_BITS (IREG_CLOCK_ENAB_7 | IREG_CLOCK_ENAB_5)
void _isr_clock(void); /* in locore.s */
void clock_intr(struct clockframe);
static bus_space_tag_t am9513_bt;
static bus_space_handle_t am9513_bh;
#define am9513_write_clk_cmd(val) \
bus_space_write_2(am9513_bt, am9513_bh, AM9513_CLK_CMD, val)
#define am9513_write_clk_data(val) \
bus_space_write_2(am9513_bt, am9513_bh, AM9513_CLK_DATA, val)
static int clock_match(device_t, cfdata_t, void *args);
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 int
clock_match(device_t parent, cfdata_t cf, void *args)
{
struct obio_attach_args *oba = args;
bus_space_handle_t bh;
bool matched;
/* This driver only supports one unit. */
if (clock_attached)
return 0;
/* Make sure there is something there... */
if (bus_space_map(oba->oba_bustag, oba->oba_paddr,
sizeof(struct am9513), 0, &bh))
return 0;
matched = (bus_space_peek_2(oba->oba_bustag, bh, 0, NULL) == 0);
bus_space_unmap(oba->oba_bustag, bh, sizeof(struct am9513));
if (!matched)
return 0;
/* Default interrupt priority. */
if (oba->oba_pri == -1)
oba->oba_pri = CLOCK_PRI;
return 1;
}
static void
clock_attach(device_t parent, device_t self, void *args)
{
struct obio_attach_args *oba = args;
bus_space_handle_t bh;
clock_attached = 1;
aprint_normal("\n");
/* Get a mapping for it. */
if (bus_space_map(oba->oba_bustag, oba->oba_paddr,
sizeof(struct am9513), 0, &bh))
panic("%s: can't map clock", __func__);
am9513_bt = oba->oba_bustag;
am9513_bh = bh;
/*
* Set the clock to the correct interrupt rate, but
* do not enable the interrupt until cpu_initclocks.
*/
/* Disarm the timer and NMI. */
am9513_write_clk_cmd(AM9513_CMD_DISARM(SUN2_CLK_TIMER | SUN2_CLK_NMI));
am9513_write_clk_cmd(AM9513_CMD_CLEAR_OUTPUT(SUN2_CLK_TIMER));
am9513_write_clk_cmd(AM9513_CMD_CLEAR_OUTPUT(SUN2_CLK_NMI));
/* Set the clock to 100 Hz, but do not enable it yet. */
am9513_write_clk_cmd(AM9513_CMD_LOAD_MODE(SUN2_CLK_TIMER));
am9513_write_clk_data((AM9513_CM_MODE_D | AM9513_CM_SOURCE_F2 |
AM9513_CM_OUTPUT_TC_TOGGLED));
am9513_write_clk_cmd(AM9513_CMD_LOAD_LOAD(SUN2_CLK_TIMER));
am9513_write_clk_data(SUN2_CLK_TICKS(AM9513_CM_SOURCE_F2, 100));
/*
* Can not hook up the ISR until cpu_initclocks()
* because hardclock is not ready until then.
* For now, the handler is _isr_autovec(), which
* will complain if it gets clock interrupts.
*/
}
/*
* Set or clear the desired clock bits in the interrupt
* register. We have to be extremely careful that we do it
* in such a manner that we don't get ourselves lost.
* XXX: Watch out! It's really easy to break this!
*/
void
set_clk_mode(int prom_clock, int on)
{
int timer;
#ifdef DIAGNOSTIC
/* Assertion: were are at splhigh! */
if ((getsr() & PSL_IPL) < PSL_IPL7)
panic("%s: bad ipl", __func__);
#endif
/* Get the timer we're talking about. */
timer = (prom_clock ? SUN2_CLK_NMI : SUN2_CLK_TIMER);
/* First, turn off the "master" enable bit. */
enable_reg_and(~ENA_INTS);
/*
* Arm the timer we're supposed to turn on.
*/
if (on) {
am9513_write_clk_cmd(AM9513_CMD_ARM(timer));
}
/*
* Disarm and clear the timers we're supposed to turn off.
*/
else {
am9513_write_clk_cmd(AM9513_CMD_DISARM(timer));
am9513_write_clk_cmd(AM9513_CMD_CLEAR_OUTPUT(timer));
}
/* Finally, turn the "master" enable back on. */
enable_reg_or(ENA_INTS);
}
/*
* Set up the real-time clock (enable clock interrupts).
* Leave stathz 0 since there is no secondary clock available.
* Note that clock interrupts MUST STAY DISABLED until here.
*/
void
cpu_initclocks(void)
{
int s;
s = splhigh();
/* Install isr (in locore.s) that calls clock_intr(). */
isr_add_custom(5, (void*)_isr_clock);
/* Now enable the clock at level 5 in the interrupt reg. */
set_clk_mode(0, 1);
splx(s);
}
/*
* This doesn't need to do anything, as we have only one timer and
* profhz==stathz==hz.
*/
void
setstatclockrate(int newhz)
{
/* nothing */
}
/*
* This is is called by the "custom" interrupt handler.
* Note that we can get ZS interrupts while this runs,
* and zshard may touch the interrupt_reg, so we must
* be careful to use the single_inst_* macros to modify
* the interrupt register atomically.
*/
void
clock_intr(struct clockframe cf)
{
idepth++;
/* Read the clock interrupt register. */
am9513_write_clk_cmd(AM9513_CMD_CLEAR_OUTPUT(SUN2_CLK_TIMER));
{ /* Entertainment! */
#ifdef LED_IDLE_CHECK
/* With this option, LEDs move only when CPU is idle. */
extern char _Idle[]; /* locore.s */
if (cf.cf_pc == (long)_Idle)
#endif
leds_intr();
}
/* Call common clock interrupt handler. */
hardclock(&cf);
idepth--;
ATOMIC_CAS_CHECK(&cf);
}