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This commit was manufactured by cvs2svn to create branch 'rtems-4-6-branch'.

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Cherrypick from master 2004-10-11 20:13:31 UTC Eric Norum <WENorum@lbl.gov> 'Don't get duplication rtc_probe() definitions.':
    c/src/lib/libbsp/i386/pc386/clock/todcfg.c
    c/src/libchip/rtc/README.mc146818a
    c/src/libchip/rtc/mc146818a.c
    c/src/libchip/rtc/mc146818a.h
    c/src/libchip/rtc/mc146818a_ioreg.c
This commit is contained in:
cvs2git
2004-10-11 20:13:32 +00:00
parent ab924e93e7
commit 361d58eef6
5 changed files with 332 additions and 0 deletions
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36
c/src/lib/libbsp/i386/pc386/clock/todcfg.c Normal file
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/*
* This file contains the RTC driver table for Motorola shared BSPs.
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*
* $Id$
*/
#include <bsp.h>
#include <libchip/rtc.h>
#include <libchip/mc146818a.h>
/* The following table configures the RTC drivers used in this BSP */
rtc_tbl RTC_Table[] = {
{
"/dev/rtc", /* sDeviceName */
RTC_MC146818A, /* deviceType */
&mc146818a_fns, /* pDeviceFns */
mc146818a_probe, /* deviceProbe */
NULL, /* pDeviceParams */
0x70, /* ulCtrlPort1 */
0x00, /* ulDataPort */
mc146818a_get_register, /* getRegister */
mc146818a_set_register /* setRegister */
}
};
/* Some information used by the RTC driver */
#define NUM_RTCS (sizeof(RTC_Table)/sizeof(rtc_tbl))
unsigned long RTC_Count = NUM_RTCS;
rtems_device_minor_number RTC_Minor;

5
c/src/libchip/rtc/README.mc146818a Normal file
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#
# $Id$
#
This is supported by the mc146818a driver.

179
c/src/libchip/rtc/mc146818a.c Normal file
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/*
* This file interfaces with the real-time clock found in
* a Motorola MC146818A (common on PC hardware)
*
* Year 2K Notes:
*
* This chip only uses a two digit field to store the year. This
* code uses the RTEMS Epoch as a pivot year. This lets us map the
* two digit year field as follows:
*
* + two digit years 0-87 are mapped to 2000-2087.
* + two digit years 88-99 are mapped to 1988-1999.
*
* This is less than the time span supported by RTEMS.
*
* COPYRIGHT (c) 1989-1999.
* 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.com/license/LICENSE.
*
* $Id$
*/
#include <rtems.h>
#include <libchip/rtc.h>
#include <libchip/mc146818a.h>
#include <bsp.h>
#define From_BCD( _x ) ((((_x) >> 4) * 10) + ((_x) & 0x0F))
#define To_BCD( _x ) ((((_x) / 10) << 4) + ((_x) % 10))
/*
* See if chip is present
*/
boolean mc146818a_probe(
int minor
)
{
unsigned32 mc146818a;
getRegister_f getReg;
unsigned32 value;
/*
* Verify that chip is present and that time is valid
*/
mc146818a = RTC_Table[ minor ].ulCtrlPort1;
getReg = RTC_Table[ minor ].getRegister;
value = (*getReg)( mc146818a, MC146818A_STATUSD );
if ((value == 0) || (value == 0xFF))
return FALSE;
return TRUE;
}
/*
* Initialize chip
*/
void mc146818a_initialize(
int minor
)
{
unsigned32 mc146818a;
getRegister_f getReg;
setRegister_f setReg;
mc146818a = RTC_Table[ minor ].ulCtrlPort1;
getReg = RTC_Table[ minor ].getRegister;
setReg = RTC_Table[ minor ].setRegister;
(*setReg)( mc146818a, MC146818A_STATUSA, MC146818ASA_DIVIDER|MC146818ASA_1024 );
(*setReg)( mc146818a, MC146818A_STATUSB, MC146818ASB_24HR );
}
/*
* Read time from chip
*/
int mc146818a_get_time(
int minor,
rtems_time_of_day *time
)
{
unsigned32 mc146818a;
getRegister_f getReg;
unsigned32 value;
rtems_interrupt_level level;
mc146818a = RTC_Table[ minor ].ulCtrlPort1;
getReg = RTC_Table[ minor ].getRegister;
/*
* No time if power failed
*/
if (((*getReg)( mc146818a, MC146818A_STATUSD ) & MC146818ASD_PWR) == 0)
return -1;
/*
* Wait for time update to complete
*/
rtems_interrupt_disable( level );
while (((*getReg)( mc146818a, MC146818A_STATUSA ) & MC146818ASA_TUP) != 0) {
rtems_interrupt_flash( level );
}
/*
* Read the time (we have at least 244 usec to do this)
*/
value = (*getReg)( mc146818a, MC146818A_YEAR );
value = From_BCD( value );
if ( value < 88 )
time->year = 2000 + value;
else
time->year = 1900 + value;
value = (*getReg)( mc146818a, MC146818A_MONTH );
time->month = From_BCD( value );
value = (*getReg)( mc146818a, MC146818A_DAY );
time->day = From_BCD( value );
value = (*getReg)( mc146818a, MC146818A_HRS );
time->hour = From_BCD( value );
value = (*getReg)( mc146818a, MC146818A_MIN );
time->minute = From_BCD( value );
value = (*getReg)( mc146818a, MC146818A_SEC );
rtems_interrupt_enable( level );
time->second = From_BCD( value );
time->ticks = 0;
return 0;
}
/*
* Set time into chip
*/
int mc146818a_set_time(
int minor,
rtems_time_of_day *time
)
{
unsigned32 mc146818a;
getRegister_f getReg;
setRegister_f setReg;
mc146818a = RTC_Table[ minor ].ulCtrlPort1;
getReg = RTC_Table[ minor ].getRegister;
setReg = RTC_Table[ minor ].setRegister;
/*
* Stop the RTC
*/
(*setReg)( mc146818a, MC146818A_STATUSB, MC146818ASB_HALT|MC146818ASB_24HR );
if ( time->year >= 2088 )
rtems_fatal_error_occurred( RTEMS_INVALID_NUMBER );
(*setReg)( mc146818a, MC146818A_YEAR, To_BCD(time->year % 100) );
(*setReg)( mc146818a, MC146818A_MONTH, To_BCD(time->month) );
(*setReg)( mc146818a, MC146818A_DAY, To_BCD(time->day) );
(*setReg)( mc146818a, MC146818A_HRS, To_BCD(time->hour) );
(*setReg)( mc146818a, MC146818A_MIN, To_BCD(time->minute) );
(*setReg)( mc146818a, MC146818A_SEC, To_BCD(time->second) );
/*
* Restart the RTC
*/
(*setReg)( mc146818a, MC146818A_STATUSB, MC146818ASB_24HR );
return 0;
}
/*
* Driver function table
*/
rtc_fns mc146818a_fns = {
mc146818a_initialize,
mc146818a_get_time,
mc146818a_set_time
};

67
c/src/libchip/rtc/mc146818a.h Normal file
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/*
* This file contains the definitions for the following real-time clocks:
*
* + Motorola MC146818A
*
* COPYRIGHT (c) 1989-1999.
* 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.com/license/LICENSE.
*
* $Id$
*/
#ifndef __LIBCHIP_MC146818A_h
#define __LIBCHIP_MC146818A_h
/*
* Register addresses within chip
*/
#define MC146818A_SEC 0x00 /* seconds */
#define MC146818A_SECALRM 0x01 /* seconds alarm */
#define MC146818A_MIN 0x02 /* minutes */
#define MC146818A_MINALRM 0x03 /* minutes alarm */
#define MC146818A_HRS 0x04 /* hours */
#define MC146818A_HRSALRM 0x05 /* hours alarm */
#define MC146818A_WDAY 0x06 /* week day */
#define MC146818A_DAY 0x07 /* day of month */
#define MC146818A_MONTH 0x08 /* month of year */
#define MC146818A_YEAR 0x09 /* month of year */
#define MC146818A_STATUSA 0x0a /* status register A */
#define MC146818ASA_TUP 0x80 /* time update in progress */
#define MC146818ASA_DIVIDER 0x20 /* divider for 32768 crystal */
#define MC146818ASA_1024 0x06 /* divide to 1024 Hz */
#define MC146818A_STATUSB 0x0b /* status register B */
#define MC146818ASB_DST 0x01 /* Daylight Savings Time */
#define MC146818ASB_24HR 0x02 /* 0 = 12 hours, 1 = 24 hours */
#define MC146818ASB_HALT 0x80 /* stop clock updates */
#define MC146818A_STATUSD 0x0d /* status register D */
#define MC146818ASD_PWR 0x80 /* clock lost power */
/*
* Driver function table
*/
extern rtc_fns mc146818a_fns;
/*
* Default register access routines
*/
unsigned32 mc146818a_get_register(
unsigned32 ulCtrlPort,
unsigned8 ucRegNum
);
void mc146818a_set_register(
unsigned32 ulCtrlPort,
unsigned8 ucRegNum,
unsigned32 ucData
);
#endif
/* end of include file */

45
c/src/libchip/rtc/mc146818a_ioreg.c Normal file
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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.com/license/LICENSE.
*
* $Id$
*/
#include <rtems.h>
#include <bsp.h>
unsigned32 mc146818a_get_register(
unsigned32 ulCtrlPort,
unsigned8 ucRegNum
)
{
unsigned8 val;
unsigned8 tmp;
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(
unsigned32 ulCtrlPort,
unsigned8 ucRegNum,
unsigned32 ucData
)
{
outport_byte( ulCtrlPort, ucRegNum );
outport_byte( ulCtrlPort+1, (unsigned8)ucData );
}