mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-30 00:21:06 +00:00
239 lines
6 KiB
C
239 lines
6 KiB
C
/*
|
|
* (C) Copyright 2007
|
|
* Matthias Fuchs, esd gmbh, matthias.fuchs@esd-electronics.com.
|
|
*
|
|
* See file CREDITS for list of people who contributed to this
|
|
* project.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as
|
|
* published by the Free Software Foundation; either version 2 of
|
|
* the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
|
|
* MA 02111-1307 USA
|
|
*/
|
|
|
|
/*
|
|
* Epson RX8025 RTC driver.
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <command.h>
|
|
#include <rtc.h>
|
|
#include <i2c.h>
|
|
|
|
#if defined(CONFIG_CMD_DATE)
|
|
|
|
/*---------------------------------------------------------------------*/
|
|
#undef DEBUG_RTC
|
|
|
|
#ifdef DEBUG_RTC
|
|
#define DEBUGR(fmt,args...) printf(fmt ,##args)
|
|
#else
|
|
#define DEBUGR(fmt,args...)
|
|
#endif
|
|
/*---------------------------------------------------------------------*/
|
|
|
|
#ifndef CONFIG_SYS_I2C_RTC_ADDR
|
|
# define CONFIG_SYS_I2C_RTC_ADDR 0x32
|
|
#endif
|
|
|
|
/*
|
|
* RTC register addresses
|
|
*/
|
|
#define RTC_SEC_REG_ADDR 0x00
|
|
#define RTC_MIN_REG_ADDR 0x01
|
|
#define RTC_HR_REG_ADDR 0x02
|
|
#define RTC_DAY_REG_ADDR 0x03
|
|
#define RTC_DATE_REG_ADDR 0x04
|
|
#define RTC_MON_REG_ADDR 0x05
|
|
#define RTC_YR_REG_ADDR 0x06
|
|
|
|
#define RTC_CTL1_REG_ADDR 0x0e
|
|
#define RTC_CTL2_REG_ADDR 0x0f
|
|
|
|
/*
|
|
* Control register 1 bits
|
|
*/
|
|
#define RTC_CTL1_BIT_2412 0x20
|
|
|
|
/*
|
|
* Control register 2 bits
|
|
*/
|
|
#define RTC_CTL2_BIT_PON 0x10
|
|
#define RTC_CTL2_BIT_VDET 0x40
|
|
#define RTC_CTL2_BIT_XST 0x20
|
|
#define RTC_CTL2_BIT_VDSL 0x80
|
|
|
|
/*
|
|
* Note: the RX8025 I2C RTC requires register
|
|
* reads and write to consist of a single bus
|
|
* cycle. It is not allowed to write the register
|
|
* address in a first cycle that is terminated by
|
|
* a STOP condition. The chips needs a 'restart'
|
|
* sequence (start sequence without a prior stop).
|
|
* This driver has been written for a 4xx board.
|
|
* U-Boot's 4xx i2c driver is currently not capable
|
|
* to generate such cycles to some work arounds
|
|
* are used.
|
|
*/
|
|
|
|
/* static uchar rtc_read (uchar reg); */
|
|
#define rtc_read(reg) buf[((reg) + 1) & 0xf]
|
|
|
|
static void rtc_write (uchar reg, uchar val);
|
|
static uchar bin2bcd (unsigned int n);
|
|
static unsigned bcd2bin (uchar c);
|
|
|
|
/*
|
|
* Get the current time from the RTC
|
|
*/
|
|
int rtc_get (struct rtc_time *tmp)
|
|
{
|
|
int rel = 0;
|
|
uchar sec, min, hour, mday, wday, mon, year, ctl2;
|
|
uchar buf[16];
|
|
|
|
if (i2c_read(CONFIG_SYS_I2C_RTC_ADDR, 0, 0, buf, 16))
|
|
printf("Error reading from RTC\n");
|
|
|
|
sec = rtc_read(RTC_SEC_REG_ADDR);
|
|
min = rtc_read(RTC_MIN_REG_ADDR);
|
|
hour = rtc_read(RTC_HR_REG_ADDR);
|
|
wday = rtc_read(RTC_DAY_REG_ADDR);
|
|
mday = rtc_read(RTC_DATE_REG_ADDR);
|
|
mon = rtc_read(RTC_MON_REG_ADDR);
|
|
year = rtc_read(RTC_YR_REG_ADDR);
|
|
|
|
DEBUGR ("Get RTC year: %02x mon: %02x mday: %02x wday: %02x "
|
|
"hr: %02x min: %02x sec: %02x\n",
|
|
year, mon, mday, wday, hour, min, sec);
|
|
|
|
/* dump status */
|
|
ctl2 = rtc_read(RTC_CTL2_REG_ADDR);
|
|
if (ctl2 & RTC_CTL2_BIT_PON) {
|
|
printf("RTC: power-on detected\n");
|
|
rel = -1;
|
|
}
|
|
|
|
if (ctl2 & RTC_CTL2_BIT_VDET) {
|
|
printf("RTC: voltage drop detected\n");
|
|
rel = -1;
|
|
}
|
|
|
|
if (!(ctl2 & RTC_CTL2_BIT_XST)) {
|
|
printf("RTC: oscillator stop detected\n");
|
|
rel = -1;
|
|
}
|
|
|
|
tmp->tm_sec = bcd2bin (sec & 0x7F);
|
|
tmp->tm_min = bcd2bin (min & 0x7F);
|
|
if (rtc_read(RTC_CTL1_REG_ADDR) & RTC_CTL1_BIT_2412)
|
|
tmp->tm_hour = bcd2bin (hour & 0x3F);
|
|
else
|
|
tmp->tm_hour = bcd2bin (hour & 0x1F) % 12 +
|
|
((hour & 0x20) ? 12 : 0);
|
|
tmp->tm_mday = bcd2bin (mday & 0x3F);
|
|
tmp->tm_mon = bcd2bin (mon & 0x1F);
|
|
tmp->tm_year = bcd2bin (year) + ( bcd2bin (year) >= 70 ? 1900 : 2000);
|
|
tmp->tm_wday = bcd2bin (wday & 0x07);
|
|
tmp->tm_yday = 0;
|
|
tmp->tm_isdst= 0;
|
|
|
|
DEBUGR ("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
|
|
tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
|
|
tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
|
|
|
|
return rel;
|
|
}
|
|
|
|
/*
|
|
* Set the RTC
|
|
*/
|
|
int rtc_set (struct rtc_time *tmp)
|
|
{
|
|
DEBUGR ("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
|
|
tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
|
|
tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
|
|
|
|
if (tmp->tm_year < 1970 || tmp->tm_year > 2069)
|
|
printf("WARNING: year should be between 1970 and 2069!\n");
|
|
|
|
rtc_write (RTC_YR_REG_ADDR, bin2bcd (tmp->tm_year % 100));
|
|
rtc_write (RTC_MON_REG_ADDR, bin2bcd (tmp->tm_mon));
|
|
rtc_write (RTC_DAY_REG_ADDR, bin2bcd (tmp->tm_wday));
|
|
rtc_write (RTC_DATE_REG_ADDR, bin2bcd (tmp->tm_mday));
|
|
rtc_write (RTC_HR_REG_ADDR, bin2bcd (tmp->tm_hour));
|
|
rtc_write (RTC_MIN_REG_ADDR, bin2bcd (tmp->tm_min));
|
|
rtc_write (RTC_SEC_REG_ADDR, bin2bcd (tmp->tm_sec));
|
|
|
|
rtc_write (RTC_CTL1_REG_ADDR, RTC_CTL1_BIT_2412);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Reset the RTC. We setting the date back to 1970-01-01.
|
|
*/
|
|
void rtc_reset (void)
|
|
{
|
|
struct rtc_time tmp;
|
|
uchar buf[16];
|
|
uchar ctl2;
|
|
|
|
if (i2c_read(CONFIG_SYS_I2C_RTC_ADDR, 0, 0, buf, 16))
|
|
printf("Error reading from RTC\n");
|
|
|
|
ctl2 = rtc_read(RTC_CTL2_REG_ADDR);
|
|
ctl2 &= ~(RTC_CTL2_BIT_PON | RTC_CTL2_BIT_VDET);
|
|
ctl2 |= RTC_CTL2_BIT_XST | RTC_CTL2_BIT_VDSL;
|
|
rtc_write (RTC_CTL2_REG_ADDR, ctl2);
|
|
|
|
tmp.tm_year = 1970;
|
|
tmp.tm_mon = 1;
|
|
tmp.tm_mday= 1;
|
|
tmp.tm_hour = 0;
|
|
tmp.tm_min = 0;
|
|
tmp.tm_sec = 0;
|
|
|
|
rtc_set(&tmp);
|
|
|
|
printf ( "RTC: %4d-%02d-%02d %2d:%02d:%02d UTC\n",
|
|
tmp.tm_year, tmp.tm_mon, tmp.tm_mday,
|
|
tmp.tm_hour, tmp.tm_min, tmp.tm_sec);
|
|
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Helper functions
|
|
*/
|
|
static void rtc_write (uchar reg, uchar val)
|
|
{
|
|
uchar buf[2];
|
|
buf[0] = reg << 4;
|
|
buf[1] = val;
|
|
if (i2c_write(CONFIG_SYS_I2C_RTC_ADDR, 0, 0, buf, 2) != 0)
|
|
printf("Error writing to RTC\n");
|
|
|
|
}
|
|
|
|
static unsigned bcd2bin (uchar n)
|
|
{
|
|
return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F));
|
|
}
|
|
|
|
static unsigned char bin2bcd (unsigned int n)
|
|
{
|
|
return (((n / 10) << 4) | (n % 10));
|
|
}
|
|
|
|
#endif /* CONFIG_RTC_RX8025 && CONFIG_CMD_DATE */
|