Signed-off-by: Matthias Fuchs <matthias.fuchs@esd-electronics.com>master
parent
1208a2dfde
commit
95c6bc7d4a
@ -0,0 +1,227 @@ |
||||
/*
|
||||
* (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_RTC_RX8025) && defined(CONFIG_CMD_DATE) |
||||
|
||||
/*---------------------------------------------------------------------*/ |
||||
#undef DEBUG_RTC |
||||
|
||||
#ifdef DEBUG_RTC |
||||
#define DEBUGR(fmt,args...) printf(fmt ,##args) |
||||
#else |
||||
#define DEBUGR(fmt,args...) |
||||
#endif |
||||
/*---------------------------------------------------------------------*/ |
||||
|
||||
#ifndef CFG_I2C_RTC_ADDR |
||||
# define CFG_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 |
||||
*/ |
||||
void rtc_get (struct rtc_time *tmp) |
||||
{ |
||||
uchar sec, min, hour, mday, wday, mon, year, ctl2; |
||||
uchar buf[16]; |
||||
|
||||
if (i2c_read(CFG_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"); |
||||
|
||||
if (ctl2 & RTC_CTL2_BIT_VDET) |
||||
printf("RTC: voltage drop detected\n"); |
||||
|
||||
if (!(ctl2 & RTC_CTL2_BIT_XST)) |
||||
printf("RTC: oscillator stop detected\n"); |
||||
|
||||
tmp->tm_sec = bcd2bin (sec & 0x7F); |
||||
tmp->tm_min = bcd2bin (min & 0x7F); |
||||
tmp->tm_hour = bcd2bin (hour & 0x3F); |
||||
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); |
||||
} |
||||
|
||||
|
||||
/*
|
||||
* Set the RTC |
||||
*/ |
||||
void 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); |
||||
} |
||||
|
||||
|
||||
/*
|
||||
* 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(CFG_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(CFG_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 && (CFG_COMMANDS & CFG_CMD_DATE) */ |
Loading…
Reference in new issue