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/*
* 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).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#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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