diff options
Diffstat (limited to 'c/src/lib/libbsp/m68k/mcf5206elite/tod/ds1307.c')
-rw-r--r-- | c/src/lib/libbsp/m68k/mcf5206elite/tod/ds1307.c | 206 |
1 files changed, 0 insertions, 206 deletions
diff --git a/c/src/lib/libbsp/m68k/mcf5206elite/tod/ds1307.c b/c/src/lib/libbsp/m68k/mcf5206elite/tod/ds1307.c deleted file mode 100644 index ab7fc7daac..0000000000 --- a/c/src/lib/libbsp/m68k/mcf5206elite/tod/ds1307.c +++ /dev/null @@ -1,206 +0,0 @@ -/* - * This file interfaces with the real-time clock found in a - * Dallas Semiconductor DS1307/DS1308 serial real-time clock chip. - * This RTC have I2C bus interface. BSP have to provide I2C bus primitives - * to make this driver working. getRegister and setRegister primitives is - * not used here to avoid multiple transactions over I2C bus (each transaction - * require significant time and error when date/time information red may - * occurs). ulControlPort contains I2C bus number; ulDataPort contains - * RTC I2C device address. - * - * Year 2000 Note: - * - * This chip only uses a two digit field to store the year. This code - * uses the RTEMS Epoch as a pivot year. This lets us map the two digit - * year field as follows: - * - * + two digit years 00-87 are mapped to 2000-2087 - * + two digit years 88-99 are mapped to 1988-1999 - */ - -/* - * Copyright (C) 2000 OKTET Ltd., St.-Petersburg, Russia - * Author: Victor V. Vengerov <vvv@oktet.ru> - * - * The license and distribution terms for this file may be - * found in the file LICENSE in this distribution or at - * http://www.rtems.org/license/LICENSE. - */ - -#include <rtems.h> -#include <libchip/rtc.h> -#include <string.h> -#include "ds1307.h" -#include "i2c.h" - -/* Convert from/to Binary-Coded Decimal representation */ -#define From_BCD( _x ) ((((_x) >> 4) * 10) + ((_x) & 0x0F)) -#define To_BCD( _x ) ((((_x) / 10) << 4) + ((_x) % 10)) - -/* ds1307_initialize -- - * Initialize DS1307 real-time clock chip. If RTC is halted, this - * function resume counting. - * - * PARAMETERS: - * minor -- minor RTC device number - */ -static void ds1307_initialize(int minor) -{ - i2c_message_status status; - int try; - uint8_t sec; - i2c_bus_number bus; - i2c_address addr; - - bus = RTC_Table[minor].ulCtrlPort1; - addr = RTC_Table[minor].ulDataPort; - - /* Read SECONDS register */ - try = 0; - do { - status = i2c_wbrd(bus, addr, 0, &sec, sizeof(sec)); - try++; - } while ((status != I2C_SUCCESSFUL) && (try < 15)); - - /* If clock is halted, reset and start the clock */ - if ((sec & DS1307_SECOND_HALT) != 0) { - uint8_t start[8]; - memset(start, 0, sizeof(start)); - start[0] = DS1307_SECOND; - try = 0; - do { - status = i2c_write(bus, addr, start, 2); - } while ((status != I2C_SUCCESSFUL) && (try < 15)); - } -} - -/* ds1307_get_time -- - * read current time from DS1307 real-time clock chip and convert it - * to the rtems_time_of_day structure. - * - * PARAMETERS: - * minor -- minor RTC device number - * time -- place to put return value (date and time) - * - * RETURNS: - * 0, if time obtained successfully - * -1, if error occured - */ -static int ds1307_get_time(int minor, rtems_time_of_day *time) -{ - i2c_bus_number bus; - i2c_address addr; - uint8_t info[8]; - uint32_t v1, v2; - i2c_message_status status; - int try; - - if (time == NULL) - return -1; - - bus = RTC_Table[minor].ulCtrlPort1; - addr = RTC_Table[minor].ulDataPort; - - memset(time, 0, sizeof(rtems_time_of_day)); - try = 0; - do { - status = i2c_wbrd(bus, addr, 0, info, sizeof(info)); - try++; - } while ((status != I2C_SUCCESSFUL) && (try < 10)); - - if (status != I2C_SUCCESSFUL) { - return -1; - } - - v1 = info[DS1307_YEAR]; - v2 = From_BCD(v1); - if (v2 < 88) - time->year = 2000 + v2; - else - time->year = 1900 + v2; - - v1 = info[DS1307_MONTH] & ~0xE0; - time->month = From_BCD(v1); - - v1 = info[DS1307_DAY] & ~0xC0; - time->day = From_BCD(v1); - - v1 = info[DS1307_HOUR]; - if (v1 & DS1307_HOUR_12) { - v2 = v1 & ~0xE0; - if (v1 & DS1307_HOUR_PM) { - time->hour = From_BCD(v2) + 12; - } else { - time->hour = From_BCD(v2); - } - } else { - v2 = v1 & ~0xC0; - time->hour = From_BCD(v2); - } - - v1 = info[DS1307_MINUTE] & ~0x80; - time->minute = From_BCD(v1); - - v1 = info[DS1307_SECOND]; - v2 = v1 & ~0x80; - time->second = From_BCD(v2); - - return 0; -} - -/* ds1307_set_time -- - * set time to the DS1307 real-time clock chip - * - * PARAMETERS: - * minor -- minor RTC device number - * time -- new date and time to be written to DS1307 - * - * RETURNS: - * 0, if time obtained successfully - * -1, if error occured - */ -static int ds1307_set_time(int minor, const rtems_time_of_day *time) -{ - i2c_bus_number bus; - i2c_address addr; - uint8_t info[8]; - i2c_message_status status; - int try; - - if (time == NULL) - return -1; - - bus = RTC_Table[minor].ulCtrlPort1; - addr = RTC_Table[minor].ulDataPort; - - if (time->year >= 2088) - rtems_fatal_error_occurred(RTEMS_INVALID_NUMBER); - - info[0] = DS1307_SECOND; - info[1 + DS1307_YEAR] = To_BCD(time->year % 100); - info[1 + DS1307_MONTH] = To_BCD(time->month); - info[1 + DS1307_DAY] = To_BCD(time->day); - info[1 + DS1307_HOUR] = To_BCD(time->hour); - info[1 + DS1307_MINUTE] = To_BCD(time->minute); - info[1 + DS1307_SECOND] = To_BCD(time->second); - info[1 + DS1307_DAY_OF_WEEK] = 1; /* Do not set day of week */ - - try = 0; - do { - status = i2c_write(bus, addr, info, 8); - try++; - } while ((status != I2C_SUCCESSFUL) && (try < 10)); - - if (status != I2C_SUCCESSFUL) - return -1; - else - return 0; -} - -/* Driver function table */ - -rtc_fns ds1307_fns = { - ds1307_initialize, - ds1307_get_time, - ds1307_set_time -}; |