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rtc: mc146818: Set up RTC at start of day

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Provide a function to set up the RTC ready for use.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2014-11-14 18:18:26 -07:00
parent a6a957849a
commit c6577f7219
3 changed files with 45 additions and 5 deletions
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2
drivers/rtc/bfin_rtc.c
View file

@ -27,7 +27,7 @@
#define NUM_SECS_IN_DAY DAYS_TO_SECS(1)
/* Enable the RTC prescaler enable register */
static void rtc_init(void)
void rtc_init(void)
{
if (!(bfin_read_RTC_PREN() & 0x1))
bfin_write_RTC_PREN(0x1);

43
drivers/rtc/mc146818.c
View file

@ -14,6 +14,7 @@
#include <common.h>
#include <command.h>
#include <rtc.h>
#include <version.h>
#if defined(__I386__) || defined(CONFIG_MALTA)
#include <asm/io.h>
@ -23,6 +24,9 @@
#if defined(CONFIG_CMD_DATE)
/* Set this to 1 to clear the CMOS RAM */
#define CLEAR_CMOS 0
static uchar rtc_read (uchar reg);
static void rtc_write (uchar reg, uchar val);
@ -41,7 +45,14 @@ static void rtc_write (uchar reg, uchar val);
#define RTC_CONFIG_B 0x0B
#define RTC_CONFIG_C 0x0C
#define RTC_CONFIG_D 0x0D
#define RTC_REG_SIZE 0x80
#define RTC_CONFIG_A_REF_CLCK_32KHZ (1 << 5)
#define RTC_CONFIG_A_RATE_1024HZ 6
#define RTC_CONFIG_B_24H (1 << 1)
#define RTC_CONFIG_D_VALID_RAM_AND_TIME 0x80
/* ------------------------------------------------------------------------- */
@ -128,25 +139,49 @@ void rtc_reset (void)
*/
static uchar rtc_read (uchar reg)
{
return(in8(CONFIG_SYS_RTC_REG_BASE_ADDR+reg));
return in8(CONFIG_SYS_RTC_REG_BASE_ADDR + reg);
}
static void rtc_write (uchar reg, uchar val)
{
out8(CONFIG_SYS_RTC_REG_BASE_ADDR+reg, val);
out8(CONFIG_SYS_RTC_REG_BASE_ADDR + reg, val);
}
#else
static uchar rtc_read (uchar reg)
{
out8(RTC_PORT_MC146818,reg);
return(in8(RTC_PORT_MC146818+1));
return in8(RTC_PORT_MC146818 + 1);
}
static void rtc_write (uchar reg, uchar val)
{
out8(RTC_PORT_MC146818,reg);
out8(RTC_PORT_MC146818+1,val);
out8(RTC_PORT_MC146818+1, val);
}
#endif
void rtc_init(void)
{
#if CLEAR_CMOS
int i;
rtc_write(RTC_SECONDS_ALARM, 0);
rtc_write(RTC_MINUTES_ALARM, 0);
rtc_write(RTC_HOURS_ALARM, 0);
for (i = RTC_CONFIG_A; i < RTC_REG_SIZE; i++)
rtc_write(i, 0);
printf("RTC: zeroing CMOS RAM\n");
#endif
/* Setup the real time clock */
rtc_write(RTC_CONFIG_B, RTC_CONFIG_B_24H);
/* Setup the frequency it operates at */
rtc_write(RTC_CONFIG_A, RTC_CONFIG_A_REF_CLCK_32KHZ |
RTC_CONFIG_A_RATE_1024HZ);
/* Ensure all reserved bits are 0 in register D */
rtc_write(RTC_CONFIG_D, RTC_CONFIG_D_VALID_RAM_AND_TIME);
/* Clear any pending interrupts */
rtc_read(RTC_CONFIG_C);
}
#endif

5
include/rtc.h
View file

@ -50,4 +50,9 @@ void to_tm (int, struct rtc_time *);
unsigned long mktime (unsigned int, unsigned int, unsigned int,
unsigned int, unsigned int, unsigned int);
/**
* rtc_init() - Set up the real time clock ready for use
*/
void rtc_init(void);
#endif /* _RTC_H_ */