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authordfr <dfr@FreeBSD.org>1999-01-23 16:53:30 +0000
committerdfr <dfr@FreeBSD.org>1999-01-23 16:53:30 +0000
commit126561435c15a39d8ef4a4269cd6203289c0ac1e (patch)
tree12e378e698803d82b0aceefe2bbd78cbab6a1245 /sys/isa/timerreg.h
parenta46648c3bc9b84e02e9017422ad131332206a603 (diff)
downloadFreeBSD-src-126561435c15a39d8ef4a4269cd6203289c0ac1e.zip
FreeBSD-src-126561435c15a39d8ef4a4269cd6203289c0ac1e.tar.gz
Update the alpha port to use the new syscons.
Submitted by: Kazutaka YOKOTA <yokota@zodiac.mech.utsunomiya-u.ac.jp> (partly)
Diffstat (limited to 'sys/isa/timerreg.h')
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1 files changed, 0 insertions, 111 deletions
diff --git a/sys/isa/timerreg.h b/sys/isa/timerreg.h
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-/*-
- * Copyright (c) 1993 The Regents of the University of California.
- * All rights reserved.
- *
- * 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: Header: timerreg.h,v 1.2 93/02/28 15:08:58 mccanne Exp
- * $Id$
- * from: i386/isa timerreg.h,v 1.5
- */
-
-/*
- *
- * Register definitions for the Intel 8253 Programmable Interval Timer.
- *
- * This chip has three independent 16-bit down counters that can be
- * read on the fly. There are three mode registers and three countdown
- * registers. The countdown registers are addressed directly, via the
- * first three I/O ports. The three mode registers are accessed via
- * the fourth I/O port, with two bits in the mode byte indicating the
- * register. (Why are hardware interfaces always so braindead?).
- *
- * To write a value into the countdown register, the mode register
- * is first programmed with a command indicating the which byte of
- * the two byte register is to be modified. The three possibilities
- * are load msb (TMR_MR_MSB), load lsb (TMR_MR_LSB), or load lsb then
- * msb (TMR_MR_BOTH).
- *
- * To read the current value ("on the fly") from the countdown register,
- * you write a "latch" command into the mode register, then read the stable
- * value from the corresponding I/O port. For example, you write
- * TMR_MR_LATCH into the corresponding mode register. Presumably,
- * after doing this, a write operation to the I/O port would result
- * in undefined behavior (but hopefully not fry the chip).
- * Reading in this manner has no side effects.
- *
- * [IBM-PC]
- * The outputs of the three timers are connected as follows:
- *
- * timer 0 -> irq 0
- * timer 1 -> dma chan 0 (for dram refresh)
- * timer 2 -> speaker (via keyboard controller)
- *
- * Timer 0 is used to call hardclock.
- * Timer 2 is used to generate console beeps.
- *
- * [PC-9801]
- * The outputs of the three timers are connected as follows:
- *
- * timer 0 -> irq 0
- * timer 1 -> speaker (via keyboard controller)
- * timer 2 -> RS232C
- *
- * Timer 0 is used to call hardclock.
- * Timer 1 is used to generate console beeps.
- */
-
-/*
- * Macros for specifying values to be written into a mode register.
- */
-#define TIMER_CNTR0 (IO_TIMER1 + 0) /* timer 0 counter port */
-#ifdef PC98
-#define TIMER_CNTR1 0x3fdb /* timer 1 counter port */
-#define TIMER_CNTR2 (IO_TIMER1 + 4) /* timer 2 counter port */
-#define TIMER_MODE (IO_TIMER1 + 6) /* timer mode port */
-#else
-#define TIMER_CNTR1 (IO_TIMER1 + 1) /* timer 1 counter port */
-#define TIMER_CNTR2 (IO_TIMER1 + 2) /* timer 2 counter port */
-#define TIMER_MODE (IO_TIMER1 + 3) /* timer mode port */
-#endif
-#define TIMER_SEL0 0x00 /* select counter 0 */
-#define TIMER_SEL1 0x40 /* select counter 1 */
-#define TIMER_SEL2 0x80 /* select counter 2 */
-#define TIMER_INTTC 0x00 /* mode 0, intr on terminal cnt */
-#define TIMER_ONESHOT 0x02 /* mode 1, one shot */
-#define TIMER_RATEGEN 0x04 /* mode 2, rate generator */
-#define TIMER_SQWAVE 0x06 /* mode 3, square wave */
-#define TIMER_SWSTROBE 0x08 /* mode 4, s/w triggered strobe */
-#define TIMER_HWSTROBE 0x0a /* mode 5, h/w triggered strobe */
-#define TIMER_LATCH 0x00 /* latch counter for reading */
-#define TIMER_LSB 0x10 /* r/w counter LSB */
-#define TIMER_MSB 0x20 /* r/w counter MSB */
-#define TIMER_16BIT 0x30 /* r/w counter 16 bits, LSB first */
-#define TIMER_BCD 0x01 /* count in BCD */
-
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