175 lines
4.3 KiB
C
175 lines
4.3 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2008 by Robert Kukla
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "rtc.h"
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#include "logf.h"
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#include "sw_i2c.h"
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#include "i2c-pp.h"
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#include "timefuncs.h"
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/* The RTC chip is unknown, the information about it was gathered by
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* reverse engineering the bootloader.
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*/
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#define RTC_ADDR 0x60
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#define RTC_CMD_CTRL 0 /* OF uses it with single byte 1 or 2 */
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#define RTC_CMD_UNKN 1 /* OF uses it with single byte 8 */
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#define RTC_CMD_DATA 2
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#define RTC_CMD_TEST 7 /* OF uses it with single byte 0xAA */
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/* private */
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static void reverse_bits(unsigned char* v, int size) {
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int i,j,in,out=0;
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for(j=0; j<size; j++) {
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in = v[j];
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out = in;
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for(i=0; i<7; i++) {
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in = in >>1;
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out = out<<1;
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out |= (in & 1);
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}
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v[j] = out;
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}
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}
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static int sw_i2c(int access, int cmd, unsigned char* buf, int count) {
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int i, addr;
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i2c_lock();
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GPIOC_ENABLE |= 0x00000030;
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addr = RTC_ADDR | (cmd<<1);
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if(access == SW_I2C_READ) {
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i = sw_i2c_read(addr, 0, buf, count);
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reverse_bits(buf, count);
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} else {
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reverse_bits(buf, count);
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i = sw_i2c_write(addr, 0, buf, count);
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}
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GPIOC_ENABLE &= ~0x00000030;
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i2c_unlock();
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return i;
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}
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/* public */
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void rtc_init(void)
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{
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sw_i2c_init();
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#if 0
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/* init sequence from OF for reference */
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/* currently we rely on the bootloader doing it for us */
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bool flag = true;
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unsigned char data;
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unsigned char v[7] = {0x00,0x47,0x17,0x06,0x03,0x02,0x08}; /* random time */
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if(flag) {
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GPIOB_ENABLE |= 0x80;
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GPIOB_OUTPUT_EN |= 0x80;
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GPIOB_OUTPUT_VAL &= ~0x80;
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DEV_EN |= 0x1000;
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/* some more stuff that is not clear */
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sw_i2c(SW_I2C_READ, RTC_CMD_CTRL, &data, 1);
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if((data<<0x18)>>0x1e) { /* bit 7 & 6 */
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data = 1;
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sw_i2c(SW_I2C_WRITE, RTC_CMD_CTRL, &data, 1);
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data = 1;
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sw_i2c(SW_I2C_WRITE, RTC_CMD_CTRL, &data, 1);
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data = 8;
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sw_i2c(SW_I2C_WRITE, RTC_CMD_UNKN, &data, 1);
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/* more stuff, perhaps set up time array? */
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rtc_write_datetime(v);
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}
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data = 2;
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sw_i2c(SW_I2C_WRITE, RTC_CMD_CTRL, &data, 1);
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}
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data = 2;
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sw_i2c(SW_I2C_WRITE, RTC_CMD_CTRL, &data, 1);
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#endif
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}
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int rtc_read_datetime(struct tm *tm)
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{
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unsigned int i;
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int rc;
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unsigned char buf[7];
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rc = sw_i2c(SW_I2C_READ, RTC_CMD_DATA, buf, sizeof(buf));
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buf[4] &= 0x3f; /* mask out p.m. flag */
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for (i = 0; i < sizeof(buf); i++)
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buf[i] = BCD2DEC(buf[i]);
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tm->tm_sec = buf[6];
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tm->tm_min = buf[5];
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tm->tm_hour = buf[4];
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tm->tm_mday = buf[2];
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tm->tm_mon = buf[1] - 1;
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tm->tm_year = buf[0] + 100;
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set_day_of_week(tm);
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set_day_of_year(tm);
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return rc;
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}
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int rtc_write_datetime(const struct tm *tm)
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{
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unsigned int i;
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int rc;
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unsigned char buf[7];
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buf[6] = tm->tm_sec;
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buf[5] = tm->tm_min;
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buf[4] = tm->tm_hour;
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buf[3] = tm->tm_wday;
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buf[2] = tm->tm_mday;
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buf[1] = tm->tm_mon + 1;
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buf[0] = tm->tm_year - 100;
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for (i = 0; i < sizeof(buf); i++)
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buf[i] = DEC2BCD(buf[i]);
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rc = sw_i2c(SW_I2C_WRITE, RTC_CMD_DATA, buf, sizeof(buf));
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return rc;
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}
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