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Diffstat (limited to 'drivers/rtc/m41t60.c')
-rw-r--r--drivers/rtc/m41t60.c239
1 files changed, 0 insertions, 239 deletions
diff --git a/drivers/rtc/m41t60.c b/drivers/rtc/m41t60.c
deleted file mode 100644
index b8ad33e0125..00000000000
--- a/drivers/rtc/m41t60.c
+++ /dev/null
@@ -1,239 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * (C) Copyright 2007
- * Larry Johnson, lrj@acm.org
- *
- * based on rtc/m41t11.c which is ...
- *
- * (C) Copyright 2002
- * Andrew May, Viasat Inc, amay@viasat.com
- */
-
-/*
- * STMicroelectronics M41T60 serial access real-time clock
- */
-
-/* #define DEBUG 1 */
-
-#include <common.h>
-#include <command.h>
-#include <env.h>
-#include <log.h>
-#include <rtc.h>
-#include <i2c.h>
-
-/*
- * Convert between century and "century bits" (CB1 and CB0). These routines
- * assume years are in the range 1900 - 2299.
- */
-
-static unsigned char year2cb(unsigned const year)
-{
- if (year < 1900 || year >= 2300)
- printf("M41T60 RTC: year %d out of range\n", year);
-
- return (year / 100) & 0x3;
-}
-
-static unsigned cb2year(unsigned const cb)
-{
- return 1900 + 100 * ((cb + 1) & 0x3);
-}
-
-/*
- * These are simple defines for the chip local to here so they aren't too
- * verbose. DAY/DATE aren't nice but that is how they are on the data sheet.
- */
-#define RTC_SEC 0x0
-#define RTC_MIN 0x1
-#define RTC_HOUR 0x2
-#define RTC_DAY 0x3
-#define RTC_DATE 0x4
-#define RTC_MONTH 0x5
-#define RTC_YEAR 0x6
-
-#define RTC_REG_CNT 7
-
-#define RTC_CTRL 0x7
-
-#if defined(DEBUG)
-static void rtc_dump(char const *const label)
-{
- uchar data[8];
-
- if (i2c_read(CONFIG_SYS_I2C_RTC_ADDR, 0, 1, data, sizeof(data))) {
- printf("I2C read failed in rtc_dump()\n");
- return;
- }
- printf("RTC dump %s: %02X-%02X-%02X-%02X-%02X-%02X-%02X-%02X\n",
- label, data[0], data[1], data[2], data[3],
- data[4], data[5], data[6], data[7]);
-}
-#else
-#define rtc_dump(label)
-#endif
-
-static uchar *rtc_validate(void)
-{
- /*
- * This routine uses the OUT bit and the validity of the time values to
- * determine whether there has been an initial power-up since the last
- * time the routine was run. It assumes that the OUT bit is not being
- * used for any other purpose.
- */
- static const uchar daysInMonth[0x13] = {
- 0x00, 0x31, 0x29, 0x31, 0x30, 0x31, 0x30, 0x31,
- 0x31, 0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x31, 0x30, 0x31
- };
- static uchar data[8];
- uchar min, date, month, years;
-
- rtc_dump("begin validate");
- if (i2c_read(CONFIG_SYS_I2C_RTC_ADDR, 0, 1, data, sizeof(data))) {
- printf("I2C read failed in rtc_validate()\n");
- return 0;
- }
- /*
- * If the OUT bit is "1", there has been a loss of power, so stop the
- * oscillator so it can be "kick-started" as per data sheet.
- */
- if (0x00 != (data[RTC_CTRL] & 0x80)) {
- printf("M41T60 RTC clock lost power.\n");
- data[RTC_SEC] = 0x80;
- if (i2c_write(CONFIG_SYS_I2C_RTC_ADDR, RTC_SEC, 1, data, 1)) {
- printf("I2C write failed in rtc_validate()\n");
- return 0;
- }
- }
- /*
- * If the oscillator is stopped or the date is invalid, then reset the
- * OUT bit to "0", reset the date registers, and start the oscillator.
- */
- min = data[RTC_MIN] & 0x7F;
- date = data[RTC_DATE];
- month = data[RTC_MONTH] & 0x3F;
- years = data[RTC_YEAR];
- if (0x59 < data[RTC_SEC] || 0x09 < (data[RTC_SEC] & 0x0F) ||
- 0x59 < min || 0x09 < (min & 0x0F) ||
- 0x23 < data[RTC_HOUR] || 0x09 < (data[RTC_HOUR] & 0x0F) ||
- 0x07 < data[RTC_DAY] || 0x00 == data[RTC_DAY] ||
- 0x12 < month ||
- 0x99 < years || 0x09 < (years & 0x0F) ||
- daysInMonth[month] < date || 0x09 < (date & 0x0F) || 0x00 == date ||
- (0x29 == date && 0x02 == month &&
- ((0x00 != (years & 0x03)) ||
- (0x00 == years && 0x00 != (data[RTC_MONTH] & 0xC0))))) {
- printf("Resetting M41T60 RTC clock.\n");
- /*
- * Set to 00:00:00 1900-01-01 (Monday)
- */
- data[RTC_SEC] = 0x00;
- data[RTC_MIN] &= 0x80; /* preserve OFIE bit */
- data[RTC_HOUR] = 0x00;
- data[RTC_DAY] = 0x02;
- data[RTC_DATE] = 0x01;
- data[RTC_MONTH] = 0xC1;
- data[RTC_YEAR] = 0x00;
- data[RTC_CTRL] &= 0x7F; /* reset OUT bit */
-
- if (i2c_write(CONFIG_SYS_I2C_RTC_ADDR, 0, 1, data, sizeof(data))) {
- printf("I2C write failed in rtc_validate()\n");
- return 0;
- }
- }
- return data;
-}
-
-int rtc_get(struct rtc_time *tmp)
-{
- uchar const *const data = rtc_validate();
-
- if (!data)
- return -1;
-
- tmp->tm_sec = bcd2bin(data[RTC_SEC] & 0x7F);
- tmp->tm_min = bcd2bin(data[RTC_MIN] & 0x7F);
- tmp->tm_hour = bcd2bin(data[RTC_HOUR] & 0x3F);
- tmp->tm_mday = bcd2bin(data[RTC_DATE] & 0x3F);
- tmp->tm_mon = bcd2bin(data[RTC_MONTH] & 0x1F);
- tmp->tm_year = cb2year(data[RTC_MONTH] >> 6) + bcd2bin(data[RTC_YEAR]);
- tmp->tm_wday = bcd2bin(data[RTC_DAY] & 0x07) - 1;
- tmp->tm_yday = 0;
- tmp->tm_isdst = 0;
-
- debug("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);
-
- return 0;
-}
-
-int rtc_set(struct rtc_time *tmp)
-{
- uchar *const data = rtc_validate();
-
- if (!data)
- return -1;
-
- debug("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);
-
- data[RTC_SEC] = (data[RTC_SEC] & 0x80) | (bin2bcd(tmp->tm_sec) & 0x7F);
- data[RTC_MIN] = (data[RTC_MIN] & 0X80) | (bin2bcd(tmp->tm_min) & 0X7F);
- data[RTC_HOUR] = bin2bcd(tmp->tm_hour) & 0x3F;
- data[RTC_DATE] = bin2bcd(tmp->tm_mday) & 0x3F;
- data[RTC_MONTH] = bin2bcd(tmp->tm_mon) & 0x1F;
- data[RTC_YEAR] = bin2bcd(tmp->tm_year % 100);
- data[RTC_MONTH] |= year2cb(tmp->tm_year) << 6;
- data[RTC_DAY] = bin2bcd(tmp->tm_wday + 1) & 0x07;
- if (i2c_write(CONFIG_SYS_I2C_RTC_ADDR, 0, 1, data, RTC_REG_CNT)) {
- printf("I2C write failed in rtc_set()\n");
- return -1;
- }
-
- return 0;
-}
-
-void rtc_reset(void)
-{
- uchar *const data = rtc_validate();
- char const *const s = env_get("rtccal");
-
- if (!data)
- return;
-
- rtc_dump("begin reset");
- /*
- * If environmental variable "rtccal" is present, it must be a hex value
- * between 0x00 and 0x3F, inclusive. The five least-significan bits
- * represent the calibration magnitude, and the sixth bit the sign bit.
- * If these do not match the contents of the hardware register, that
- * register is updated. The value 0x00 imples no correction. Consult
- * the M41T60 documentation for further details.
- */
- if (s) {
- unsigned long const l = hextoul(s, 0);
-
- if (l <= 0x3F) {
- if ((data[RTC_CTRL] & 0x3F) != l) {
- printf("Setting RTC calibration to 0x%02lX\n",
- l);
- data[RTC_CTRL] &= 0xC0;
- data[RTC_CTRL] |= (uchar) l;
- }
- } else
- printf("environment parameter \"rtccal\" not valid: "
- "ignoring\n");
- }
- /*
- * Turn off frequency test.
- */
- data[RTC_CTRL] &= 0xBF;
- if (i2c_write(CONFIG_SYS_I2C_RTC_ADDR, RTC_CTRL, 1, data + RTC_CTRL, 1)) {
- printf("I2C write failed in rtc_reset()\n");
- return;
- }
- rtc_dump("end reset");
-}
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