diff options
Diffstat (limited to 'drivers/rtc/m41t94.c')
-rw-r--r-- | drivers/rtc/m41t94.c | 123 |
1 files changed, 0 insertions, 123 deletions
diff --git a/drivers/rtc/m41t94.c b/drivers/rtc/m41t94.c deleted file mode 100644 index 5b665bb..0000000 --- a/drivers/rtc/m41t94.c +++ /dev/null @@ -1,123 +0,0 @@ -/* - * Driver for ST M41T94 SPI RTC - * - * Taken from the Linux kernel drivier: - * Copyright (C) 2008 Kim B. Heino - * - * Adaptation for U-Boot: - * Copyright (C) 2009 - * Albin Tonnerre, Free Electrons <albin.tonnerre@free-electrons.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - */ - -#include <common.h> -#include <rtc.h> -#include <spi.h> - -static struct spi_slave *slave; - -#define M41T94_REG_SECONDS 0x01 -#define M41T94_REG_MINUTES 0x02 -#define M41T94_REG_HOURS 0x03 -#define M41T94_REG_WDAY 0x04 -#define M41T94_REG_DAY 0x05 -#define M41T94_REG_MONTH 0x06 -#define M41T94_REG_YEAR 0x07 -#define M41T94_REG_HT 0x0c - -#define M41T94_BIT_HALT 0x40 -#define M41T94_BIT_STOP 0x80 -#define M41T94_BIT_CB 0x40 -#define M41T94_BIT_CEB 0x80 - -int rtc_set(struct rtc_time *tm) -{ - u8 buf[8]; /* write cmd + 7 registers */ - int ret; - - if (!slave) { - slave = spi_setup_slave(CONFIG_M41T94_SPI_BUS, - CONFIG_M41T94_SPI_CS, 1000000, - SPI_MODE_3); - if (!slave) - return -1; - } - spi_claim_bus(slave); - - buf[0] = 0x80 | M41T94_REG_SECONDS; /* write time + date */ - buf[M41T94_REG_SECONDS] = bin2bcd(tm->tm_sec); - buf[M41T94_REG_MINUTES] = bin2bcd(tm->tm_min); - buf[M41T94_REG_HOURS] = bin2bcd(tm->tm_hour); - buf[M41T94_REG_WDAY] = bin2bcd(tm->tm_wday + 1); - buf[M41T94_REG_DAY] = bin2bcd(tm->tm_mday); - buf[M41T94_REG_MONTH] = bin2bcd(tm->tm_mon + 1); - - buf[M41T94_REG_HOURS] |= M41T94_BIT_CEB; - if (tm->tm_year >= 100) - buf[M41T94_REG_HOURS] |= M41T94_BIT_CB; - buf[M41T94_REG_YEAR] = bin2bcd(tm->tm_year % 100); - - ret = spi_xfer(slave, 64, buf, NULL, SPI_XFER_BEGIN | SPI_XFER_END); - spi_release_bus(slave); - return ret; -} - -int rtc_get(struct rtc_time *tm) -{ - u8 buf[2]; - int ret, hour; - - if (!slave) { - slave = spi_setup_slave(CONFIG_M41T94_SPI_BUS, - CONFIG_M41T94_SPI_CS, 1000000, - SPI_MODE_3); - if (!slave) - return -1; - } - spi_claim_bus(slave); - - /* clear halt update bit */ - ret = spi_w8r8(slave, M41T94_REG_HT); - if (ret < 0) - return ret; - if (ret & M41T94_BIT_HALT) { - buf[0] = 0x80 | M41T94_REG_HT; - buf[1] = ret & ~M41T94_BIT_HALT; - spi_xfer(slave, 16, buf, NULL, SPI_XFER_BEGIN | SPI_XFER_END); - } - - /* clear stop bit */ - ret = spi_w8r8(slave, M41T94_REG_SECONDS); - if (ret < 0) - return ret; - if (ret & M41T94_BIT_STOP) { - buf[0] = 0x80 | M41T94_REG_SECONDS; - buf[1] = ret & ~M41T94_BIT_STOP; - spi_xfer(slave, 16, buf, NULL, SPI_XFER_BEGIN | SPI_XFER_END); - } - - tm->tm_sec = bcd2bin(spi_w8r8(slave, M41T94_REG_SECONDS)); - tm->tm_min = bcd2bin(spi_w8r8(slave, M41T94_REG_MINUTES)); - hour = spi_w8r8(slave, M41T94_REG_HOURS); - tm->tm_hour = bcd2bin(hour & 0x3f); - tm->tm_wday = bcd2bin(spi_w8r8(slave, M41T94_REG_WDAY)) - 1; - tm->tm_mday = bcd2bin(spi_w8r8(slave, M41T94_REG_DAY)); - tm->tm_mon = bcd2bin(spi_w8r8(slave, M41T94_REG_MONTH)) - 1; - tm->tm_year = bcd2bin(spi_w8r8(slave, M41T94_REG_YEAR)); - if ((hour & M41T94_BIT_CB) || !(hour & M41T94_BIT_CEB)) - tm->tm_year += 100; - - spi_release_bus(slave); - return 0; -} - -void rtc_reset(void) -{ - /* - * Could not be tested as the reset pin is not wired on - * the sbc35-ag20 board - */ -} |