forked from Imagelibrary/rtems
57 lines
1.4 KiB
C
57 lines
1.4 KiB
C
/*
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* This file contains a typical set of register access routines which may be
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* used with the MC146818A chip if accesses to the chip are as follows:
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*
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* + registers are in I/O space
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* + registers are accessed as bytes
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* + registers are only byte-aligned (no address gaps)
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*/
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/*
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* COPYRIGHT (c) 1989-1997.
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* On-Line Applications Research Corporation (OAR).
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.org/license/LICENSE.
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*/
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#include <rtems.h>
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#include <bsp.h>
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#include <libchip/rtc.h>
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#include <libchip/mc146818a.h>
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/*
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* At this point, not all CPUs or BSPs have defined in/out port routines.
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*/
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#if defined(__i386__) || defined(__PPC__)
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#if defined(inport_byte)
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uint32_t mc146818a_get_register(
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uintptr_t ulCtrlPort,
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uint8_t ucRegNum
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)
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{
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uint8_t val;
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uint8_t tmp;
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(void) tmp; /* eliminate warning for set but not used */
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outport_byte( ulCtrlPort, ucRegNum );
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inport_byte( 0x84, tmp ); /* Hack a delay to give chip time to settle */
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inport_byte( ulCtrlPort+1, val );
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inport_byte( 0x84, tmp ); /* Hack a delay to give chip time to settle */
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return val;
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}
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void mc146818a_set_register(
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uintptr_t ulCtrlPort,
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uint8_t ucRegNum,
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uint32_t ucData
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)
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{
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outport_byte( ulCtrlPort, ucRegNum );
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outport_byte( ulCtrlPort+1, (uint8_t)ucData );
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}
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#endif
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#endif
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