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/* SPDX-License-Identifier: BSD-2-Clause */
/*
* This file contains a typical set of register access routines which may be
* used with the MC146818A chip if accesses to the chip are as follows:
*
* + registers are in I/O space
* + registers are accessed as bytes
* + registers are only byte-aligned (no address gaps)
*/
/*
* COPYRIGHT (c) 1989-1997.
* On-Line Applications Research Corporation (OAR).
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
*/
#include <rtems.h>
#include <bsp.h>
#include <libchip/rtc.h>
#include <libchip/mc146818a.h>
/*
* At this point, not all CPUs or BSPs have defined in/out port routines.
*/
#if defined(__i386__) || defined(__PPC__)
#if defined(inport_byte)
uint32_t mc146818a_get_register(
uintptr_t ulCtrlPort,
uint8_t ucRegNum
)
{
uint8_t val;
uint8_t tmp;
(void) tmp; /* eliminate warning for set but not used */
outport_byte( ulCtrlPort, ucRegNum );
inport_byte( 0x84, tmp ); /* Hack a delay to give chip time to settle */
inport_byte( ulCtrlPort+1, val );
inport_byte( 0x84, tmp ); /* Hack a delay to give chip time to settle */
return val;
}
void mc146818a_set_register(
uintptr_t ulCtrlPort,
uint8_t ucRegNum,
uint32_t ucData
)
{
outport_byte( ulCtrlPort, ucRegNum );
outport_byte( ulCtrlPort+1, (uint8_t)ucData );
}
#endif
#endif
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