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/*
* Copyright (C) ST-Ericsson SA 2010
*
* based on Linux drivers/rtc/rtc-pl031.c:
*
* Real Time Clock interface for ARM AMBA PrimeCell 031 RTC
*
* Author: Deepak Saxena <dsaxena@plexity.net>
*
* Copyright 2006 (c) MontaVista Software, Inc.
*
* Author: Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>
* Copyright 2010 (c) ST-Ericsson AB
*
* 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.
*/
#include <common.h>
#include <command.h>
#include <asm/io.h>
#include <rtc.h>
#if defined(CONFIG_CMD_DATE)
#ifndef CONFIG_SYS_RTC_PL031_BASE
#error CONFIG_SYS_RTC_PL031_BASE is not defined!
#endif
/*
* Register definitions
*/
#define RTC_DR 0x00 /* Data read register */
#define RTC_MR 0x04 /* Match register */
#define RTC_LR 0x08 /* Data load register */
#define RTC_CR 0x0c /* Control register */
#define RTC_IMSC 0x10 /* Interrupt mask and set register */
#define RTC_RIS 0x14 /* Raw interrupt status register */
#define RTC_MIS 0x18 /* Masked interrupt status register */
#define RTC_ICR 0x1c /* Interrupt clear register */
/* ST variants have additional timer functionality */
#define RTC_TDR 0x20 /* Timer data read register */
#define RTC_TLR 0x24 /* Timer data load register */
#define RTC_TCR 0x28 /* Timer control register */
#define RTC_YDR 0x30 /* Year data read register */
#define RTC_YMR 0x34 /* Year match register */
#define RTC_YLR 0x38 /* Year data load register */
#define RTC_CR_CWEN (1 << 26) /* Clockwatch enable bit */
/* Common bit definations for ST v2 for reading/writing time */
#define RTC_SEC_SHIFT 0
#define RTC_SEC_MASK (0x3F << RTC_SEC_SHIFT) /* Second [0-59] */
#define RTC_MIN_SHIFT 6
#define RTC_MIN_MASK (0x3F << RTC_MIN_SHIFT) /* Minute [0-59] */
#define RTC_HOUR_SHIFT 12
#define RTC_HOUR_MASK (0x1F << RTC_HOUR_SHIFT) /* Hour [0-23] */
#define RTC_WDAY_SHIFT 17
#define RTC_WDAY_MASK (0x7 << RTC_WDAY_SHIFT) /* Day of Week [1-7] 1=Sunday */
#define RTC_MDAY_SHIFT 20
#define RTC_MDAY_MASK (0x1F << RTC_MDAY_SHIFT) /* Day of Month [1-31] */
#define RTC_MON_SHIFT 25
#define RTC_MON_MASK (0xF << RTC_MON_SHIFT) /* Month [1-12] 1=January */
static int pl031_initted = 0;
/*
* Convert Gregorian date to ST v2 RTC format.
*/
static int pl031_stv2_tm_to_time(struct rtc_time *tm, unsigned long *st_time,
unsigned long *bcd_year)
{
int year = tm->tm_year;
int wday = tm->tm_wday;
/* wday masking is not working in hardware so wday must be valid */
if (wday < -1 || wday > 6) {
printf("invalid wday value %d\n", tm->tm_wday);
return -1;
} else if (wday == -1) {
/* wday is not provided, calculate it here */
GregorianDay(tm);
wday = tm->tm_wday;
}
*bcd_year = (bin2bcd(year % 100) | bin2bcd(year / 100) << 8);
*st_time = (tm->tm_mon << RTC_MON_SHIFT)
| (tm->tm_mday << RTC_MDAY_SHIFT)
| ((wday + 1) << RTC_WDAY_SHIFT)
| (tm->tm_hour << RTC_HOUR_SHIFT)
| (tm->tm_min << RTC_MIN_SHIFT)
| (tm->tm_sec << RTC_SEC_SHIFT);
return 0;
}
/*
* Convert ST v2 RTC format to Gregorian date.
*/
static int pl031_stv2_time_to_tm(unsigned long st_time, unsigned long bcd_year,
struct rtc_time *tm)
{
tm->tm_year = bcd2bin(bcd_year) + (bcd2bin(bcd_year >> 8) * 100);
tm->tm_mon = ((st_time & RTC_MON_MASK) >> RTC_MON_SHIFT);
tm->tm_mday = ((st_time & RTC_MDAY_MASK) >> RTC_MDAY_SHIFT);
tm->tm_wday = ((st_time & RTC_WDAY_MASK) >> RTC_WDAY_SHIFT) - 1;
tm->tm_hour = ((st_time & RTC_HOUR_MASK) >> RTC_HOUR_SHIFT);
tm->tm_min = ((st_time & RTC_MIN_MASK) >> RTC_MIN_SHIFT);
tm->tm_sec = ((st_time & RTC_SEC_MASK) >> RTC_SEC_SHIFT);
return 0;
}
static int pl031_stv2_read_time(struct rtc_time *tm)
{
pl031_stv2_time_to_tm(readl(CONFIG_SYS_RTC_PL031_BASE + RTC_DR),
readl(CONFIG_SYS_RTC_PL031_BASE + RTC_YDR), tm);
return 0;
}
static int pl031_stv2_set_time(struct rtc_time *tm)
{
unsigned long time;
unsigned long bcd_year;
int ret;
ret = pl031_stv2_tm_to_time(tm, &time, &bcd_year);
if (ret == 0) {
writel(bcd_year, CONFIG_SYS_RTC_PL031_BASE + RTC_YLR);
writel(time, CONFIG_SYS_RTC_PL031_BASE + RTC_LR);
}
/*
* The new setting is transferred to the ClockWatch counters on the
* next CLK1HZ rising edge after RTC_CWDLR register has been written.
*/
udelay(1000 * 1000);
return ret;
}
/* Enable RTC Start in Control register*/
void rtc_init(void)
{
writel(readl(CONFIG_SYS_RTC_PL031_BASE + RTC_CR) | RTC_CR_CWEN,
CONFIG_SYS_RTC_PL031_BASE + RTC_CR);
pl031_initted = 1;
}
/*
* Reset the RTC. We set the date back to 1970-01-01.
*/
void rtc_reset(void)
{
if (!pl031_initted)
rtc_init();
/* POR value, 2000-01-01 Sun */
writel(0x02120000, CONFIG_SYS_RTC_PL031_BASE + RTC_LR);
writel(0x2000, CONFIG_SYS_RTC_PL031_BASE + RTC_YLR);
/*
* The new setting is transferred to the ClockWatch counters on the
* next CLK1HZ rising edge after RTC_CWDLR register has been written.
*/
udelay(1000 * 1000);
}
/*
* Set the RTC
*/
int rtc_set(struct rtc_time *tm)
{
if (!pl031_initted)
rtc_init();
if (tm == NULL) {
puts("Error setting the date/time\n");
return -1;
}
return pl031_stv2_set_time(tm);
}
/*
* Get the current time from the RTC
*/
int rtc_get(struct rtc_time *tm)
{
if (!pl031_initted)
rtc_init();
if (tm == NULL) {
puts("Error getting the date/time\n");
return -1;
}
pl031_stv2_read_time(tm);
debug("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday,
tm->tm_hour, tm->tm_min, tm->tm_sec);
return 0;
}
#endif
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