/*
* 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) 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. Sun3X machines may have
* either the Mostek 48T02 or the Intersil 7170 clock.
*
* It is tricky to determine which you have, because there is
* always something responding at the address where the Mostek
* clock might be found: either a Mostek or plain-old EEPROM.
* Therefore, we cheat. If we find an Intersil clock, assume
* that what responds at the end of the EEPROM space is just
* plain-old EEPROM (not a Mostek clock). Worse, there are
* H/W problems with probing for an Intersil on the 3/80, so
* on that machine we "know" there is a Mostek clock.
*
* Note that the probing algorithm described above requires
* that we probe the intersil before we probe the mostek!
*/
/*
* Only one of these two variables should be non-zero after
* autoconfiguration determines which clock we have.
*/
static volatile void *intersil_va;
static volatile void *mostek_clk_va;
void _isr_clock(void); /* in locore.s */
void clock_intr(struct clockframe);
/*
* Set the clock to the correct interrupt rate, but
* do not enable the interrupt until cpu_initclocks.
* XXX: Actually, the interrupt_reg should be zero
* at this point, so the clock interrupts should not
* affect us, but we need to set the rate...
*/
bus_space_write_1(sc->sc_bst, sc->sc_bsh, INTERSIL_ICMD,
INTERSIL_COMMAND(INTERSIL_CMD_RUN, INTERSIL_CMD_IDISABLE));
(void)bus_space_read_1(sc->sc_bst, sc->sc_bsh, INTERSIL_IINTR);
/* Set the clock to 100 Hz, but do not enable it yet. */
bus_space_write_1(sc->sc_bst, sc->sc_bsh,
INTERSIL_IINTR, INTERSIL_INTER_CSECONDS);
sc->sc_year0 = 1968;
intersil7170_attach(sc);
aprint_normal("\n");
/*
* 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.
*/
}
#endif /* SUN3_470 */
/*
* Is there a Mostek clock? Hard to tell...
* (See comment at top of this file.)
*/
static int
clock_match(device_t parent, cfdata_t cf, void *args)
{
struct confargs *ca = args;
/* This driver only supports one unit. */
if (mostek_clk_va)
return 0;
/* If intersil was found, use that. */
if (intersil_va)
return 0;
/* Else assume a Mostek is there... */
/*
* Set and/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(u_char on, u_char off, int enable_clk)
{
u_char interreg;
/*
* If we have not yet mapped the register,
* then we do not want to do any of this...
*/
if (!interrupt_reg)
return;
#ifdef DIAGNOSTIC
/* Assertion: were are at splhigh! */
if ((getsr() & PSL_IPL) < PSL_IPL7)
panic("set_clk_mode: bad ipl");
#endif
/*
* make sure that we are only playing w/
* clock interrupt register bits
*/
on &= IREG_CLK_BITS;
off &= IREG_CLK_BITS;
/* First, turn off the "master" enable bit. */
single_inst_bclr_b(*interrupt_reg, IREG_ALL_ENAB);
/*
* Save the current interrupt register clock bits,
* and turn off/on the requested bits in the copy.
*/
interreg = *interrupt_reg & IREG_CLK_BITS;
interreg &= ~off;
interreg |= on;
/* Clear the CLK5 and CLK7 bits to clear the flip-flops. */
single_inst_bclr_b(*interrupt_reg, IREG_CLK_BITS);
#ifdef SUN3_470
if (intersil_va) {
/*
* Then disable clock interrupts, and read the clock's
* interrupt register to clear any pending signals there.
*/
intersil_clock->clk_cmd_reg =
INTERSIL_COMMAND(INTERSIL_CMD_RUN, INTERSIL_CMD_IDISABLE);
intersil_clear();
}
#endif /* SUN3_470 */
/* Set the requested bits in the interrupt register. */
single_inst_bset_b(*interrupt_reg, interreg);
#ifdef SUN3_470
/* Turn the clock back on (maybe) */
if (intersil_va && enable_clk)
intersil_clock->clk_cmd_reg =
INTERSIL_COMMAND(INTERSIL_CMD_RUN, INTERSIL_CMD_IENABLE);
#endif /* SUN3_470 */
/* Finally, turn the "master" enable back on. */
single_inst_bset_b(*interrupt_reg, IREG_ALL_ENAB);
}
/*
* 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(). */
vec_set_entry(VECI_INTRAV0 + CLOCK_PRI, (void *)_isr_clock);
/* Now enable the clock at level 5 in the interrupt reg. */
set_clk_mode(IREG_CLOCK_ENAB_5, 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 */
}
/*
* Clock interrupt handler (for both Intersil and Mostek).
* XXX - Is it worth the trouble to save a few cycles here
* by making two separate interrupt handlers?
*
* This 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)
{
extern char _Idle[]; /* locore.s */
intr_depth++;
#ifdef SUN3_470
if (intersil_va) {
/* Read the clock interrupt register. */
intersil_clear();
}
#endif /* SUN3_470 */
