From 2d3064a7aa5317a935c20b7533b21739df2e2d03 Mon Sep 17 00:00:00 2001 From: Marcin Bukat Date: Sun, 28 Nov 2010 22:51:14 +0000 Subject: HD300 - add basic RTC support git-svn-id: svn://svn.rockbox.org/rockbox/trunk@28697 a1c6a512-1295-4272-9138-f99709370657 --- firmware/drivers/rtc/rtc_s35380a.c | 128 +++++++++++++++++++++++++++++++++++++ 1 file changed, 128 insertions(+) create mode 100644 firmware/drivers/rtc/rtc_s35380a.c (limited to 'firmware/drivers/rtc/rtc_s35380a.c') diff --git a/firmware/drivers/rtc/rtc_s35380a.c b/firmware/drivers/rtc/rtc_s35380a.c new file mode 100644 index 0000000000..7a7bf81118 --- /dev/null +++ b/firmware/drivers/rtc/rtc_s35380a.c @@ -0,0 +1,128 @@ +/*************************************************************************** + * __________ __ ___. + * Open \______ \ ____ ____ | | _\_ |__ _______ ___ + * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / + * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < + * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ + * \/ \/ \/ \/ \/ + * $Id$ + * + * adopted for HD300 by Marcin Bukat + * Copyright (C) 2009 by Bertrik Sikken + * Copyright (C) 2008 by Robert Kukla + * + * 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY + * KIND, either express or implied. + * + ****************************************************************************/ +#include "config.h" +#include "rtc.h" +#include "i2c-coldfire.h" + +/* Driver for the Seiko S35380A real-time clock chip with i2c interface + + This driver was derived from rtc_s3539a.c and adapted for the MPIO HD300 + */ + +#define RTC_ADDR 0x60 + +#define STATUS_REG1 0 +#define STATUS_REG2 1 +#define REALTIME_DATA1 2 +#define REALTIME_DATA2 3 +#define INT1_REG 4 +#define INT2_REG 5 +#define CLOCK_CORR_REG 6 +#define FREE_REG 7 + +/* STATUS_REG1 flags */ +#define STATUS_REG1_POC 0x80 +#define STATUS_REG1_BLD 0x40 +#define STATUS_REG1_INT2 0x20 +#define STATUS_REG1_INT1 0x10 +#define STATUS_REG1_SC1 0x08 +#define STATUS_REG1_SC0 0x04 +#define STATUS_REG1_H1224 0x02 +#define STATUS_REG1_RESET 0x01 + + +static void reverse_bits(unsigned char* v, int size) +{ + static const unsigned char flipnibble[] = + {0x00, 0x08, 0x04, 0x0C, 0x02, 0x0A, 0x06, 0x0E, + 0x01, 0x09, 0x05, 0x0D, 0x03, 0x0B, 0x07, 0x0F}; + int i; + + for (i = 0; i < size; i++) { + v[i] = (flipnibble[v[i] & 0x0F] << 4) | + flipnibble[(v[i] >> 4) & 0x0F]; + } +} + +void rtc_init(void) +{ + unsigned char status_reg; + i2c_read(I2C_IFACE_1, RTC_ADDR | (STATUS_REG1<<1), &status_reg, 1); + + if ( (status_reg & STATUS_REG1_POC) || + (status_reg & STATUS_REG1_BLD) ) + { + /* perform rtc reset*/ + status_reg |= STATUS_REG1_RESET; + i2c_write(I2C_IFACE_1, RTC_ADDR | (STATUS_REG1<<1), &status_reg, 1); + } +} + +int rtc_read_datetime(struct tm *tm) +{ + unsigned char buf[7]; + unsigned int i; + int ret; + + ret = i2c_read(I2C_IFACE_1, RTC_ADDR | (REALTIME_DATA1<<1), buf, sizeof(buf)); + reverse_bits(buf, sizeof(buf)); + + buf[4] &= 0x3f; /* mask out p.m. flag */ + + for (i = 0; i < sizeof(buf); i++) + buf[i] = BCD2DEC(buf[i]); + + tm->tm_sec = buf[6]; + tm->tm_min = buf[5]; + tm->tm_hour = buf[4]; + tm->tm_wday = buf[3]; + tm->tm_mday = buf[2]; + tm->tm_mon = buf[1] - 1; + tm->tm_year = buf[0] + 100; + + return ret; +} + +int rtc_write_datetime(const struct tm *tm) +{ + unsigned char buf[7]; + unsigned int i; + int ret; + + buf[6] = tm->tm_sec; + buf[5] = tm->tm_min; + buf[4] = tm->tm_hour; + buf[3] = tm->tm_wday; + buf[2] = tm->tm_mday; + buf[1] = tm->tm_mon + 1; + buf[0] = tm->tm_year - 100; + + for (i = 0; i < sizeof(buf); i++) + buf[i] = DEC2BCD(buf[i]); + + reverse_bits(buf, sizeof(buf)); + ret = i2c_write(I2C_IFACE_1, RTC_ADDR | (REALTIME_DATA1<<1), buf, sizeof(buf)); + + return ret; +} + -- cgit v1.2.3