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|
/* drivers/char/s3c2410_rtc.c
*
* Copyright (c) 2004 Simtec Electronics <linux@simtec.co.uk>
* http://www.simtec.co.uk/products/SWLINUX/
*
* 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.
*
* S3C2410 Internal RTC Driver
*
* Changelog:
* 08-Nov-2004 BJD Initial creation
* 12-Nov-2004 BJD Added periodic IRQ and PM code
* 22-Nov-2004 BJD Sign-test on alarm code to check for <0
* 10-Mar-2005 LCVR Changed S3C2410_VA_RTC to S3C24XX_VA_RTC
*/
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/rtc.h>
#include <linux/bcd.h>
#include <asm/hardware.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/rtc.h>
#include <asm/mach/time.h>
#include <asm/hardware/clock.h>
#include <asm/arch/regs-rtc.h>
/* need this for the RTC_AF definitions */
#include <linux/mc146818rtc.h>
#undef S3C24XX_VA_RTC
#define S3C24XX_VA_RTC s3c2410_rtc_base
static struct resource *s3c2410_rtc_mem;
static void __iomem *s3c2410_rtc_base;
static int s3c2410_rtc_alarmno = NO_IRQ;
static int s3c2410_rtc_tickno = NO_IRQ;
static int s3c2410_rtc_freq = 1;
static DEFINE_SPINLOCK(s3c2410_rtc_pie_lock);
/* IRQ Handlers */
static irqreturn_t s3c2410_rtc_alarmirq(int irq, void *id, struct pt_regs *r)
{
rtc_update(1, RTC_AF | RTC_IRQF);
return IRQ_HANDLED;
}
static irqreturn_t s3c2410_rtc_tickirq(int irq, void *id, struct pt_regs *r)
{
rtc_update(1, RTC_PF | RTC_IRQF);
return IRQ_HANDLED;
}
/* Update control registers */
static void s3c2410_rtc_setaie(int to)
{
unsigned int tmp;
pr_debug("%s: aie=%d\n", __FUNCTION__, to);
tmp = readb(S3C2410_RTCALM);
if (to)
tmp |= S3C2410_RTCALM_ALMEN;
else
tmp &= ~S3C2410_RTCALM_ALMEN;
writeb(tmp, S3C2410_RTCALM);
}
static void s3c2410_rtc_setpie(int to)
{
unsigned int tmp;
pr_debug("%s: pie=%d\n", __FUNCTION__, to);
spin_lock_irq(&s3c2410_rtc_pie_lock);
tmp = readb(S3C2410_TICNT) & ~S3C2410_TICNT_ENABLE;
if (to)
tmp |= S3C2410_TICNT_ENABLE;
writeb(tmp, S3C2410_TICNT);
spin_unlock_irq(&s3c2410_rtc_pie_lock);
}
static void s3c2410_rtc_setfreq(int freq)
{
unsigned int tmp;
spin_lock_irq(&s3c2410_rtc_pie_lock);
tmp = readb(S3C2410_TICNT) & S3C2410_TICNT_ENABLE;
s3c2410_rtc_freq = freq;
tmp |= (128 / freq)-1;
writeb(tmp, S3C2410_TICNT);
spin_unlock_irq(&s3c2410_rtc_pie_lock);
}
/* Time read/write */
static int s3c2410_rtc_gettime(struct rtc_time *rtc_tm)
{
unsigned int have_retried = 0;
retry_get_time:
rtc_tm->tm_min = readb(S3C2410_RTCMIN);
rtc_tm->tm_hour = readb(S3C2410_RTCHOUR);
rtc_tm->tm_mday = readb(S3C2410_RTCDATE);
rtc_tm->tm_mon = readb(S3C2410_RTCMON);
rtc_tm->tm_year = readb(S3C2410_RTCYEAR);
rtc_tm->tm_sec = readb(S3C2410_RTCSEC);
/* the only way to work out wether the system was mid-update
* when we read it is to check the second counter, and if it
* is zero, then we re-try the entire read
*/
if (rtc_tm->tm_sec == 0 && !have_retried) {
have_retried = 1;
goto retry_get_time;
}
pr_debug("read time %02x.%02x.%02x %02x/%02x/%02x\n",
rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday,
rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);
BCD_TO_BIN(rtc_tm->tm_sec);
BCD_TO_BIN(rtc_tm->tm_min);
BCD_TO_BIN(rtc_tm->tm_hour);
BCD_TO_BIN(rtc_tm->tm_mday);
BCD_TO_BIN(rtc_tm->tm_mon);
BCD_TO_BIN(rtc_tm->tm_year);
rtc_tm->tm_year += 100;
rtc_tm->tm_mon -= 1;
return 0;
}
static int s3c2410_rtc_settime(struct rtc_time *tm)
{
/* the rtc gets round the y2k problem by just not supporting it */
if (tm->tm_year < 100)
return -EINVAL;
writeb(BIN2BCD(tm->tm_sec), S3C2410_RTCSEC);
writeb(BIN2BCD(tm->tm_min), S3C2410_RTCMIN);
writeb(BIN2BCD(tm->tm_hour), S3C2410_RTCHOUR);
writeb(BIN2BCD(tm->tm_mday), S3C2410_RTCDATE);
writeb(BIN2BCD(tm->tm_mon + 1), S3C2410_RTCMON);
writeb(BIN2BCD(tm->tm_year - 100), S3C2410_RTCYEAR);
return 0;
}
static int s3c2410_rtc_getalarm(struct rtc_wkalrm *alrm)
{
struct rtc_time *alm_tm = &alrm->time;
unsigned int alm_en;
alm_tm->tm_sec = readb(S3C2410_ALMSEC);
alm_tm->tm_min = readb(S3C2410_ALMMIN);
alm_tm->tm_hour = readb(S3C2410_ALMHOUR);
alm_tm->tm_mon = readb(S3C2410_ALMMON);
alm_tm->tm_mday = readb(S3C2410_ALMDATE);
alm_tm->tm_year = readb(S3C2410_ALMYEAR);
alm_en = readb(S3C2410_RTCALM);
pr_debug("read alarm %02x %02x.%02x.%02x %02x/%02x/%02x\n",
alm_en,
alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday,
alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec);
/* decode the alarm enable field */
if (alm_en & S3C2410_RTCALM_SECEN) {
BCD_TO_BIN(alm_tm->tm_sec);
} else {
alm_tm->tm_sec = 0xff;
}
if (alm_en & S3C2410_RTCALM_MINEN) {
BCD_TO_BIN(alm_tm->tm_min);
} else {
alm_tm->tm_min = 0xff;
}
if (alm_en & S3C2410_RTCALM_HOUREN) {
BCD_TO_BIN(alm_tm->tm_hour);
} else {
alm_tm->tm_hour = 0xff;
}
if (alm_en & S3C2410_RTCALM_DAYEN) {
BCD_TO_BIN(alm_tm->tm_mday);
} else {
alm_tm->tm_mday = 0xff;
}
if (alm_en & S3C2410_RTCALM_MONEN) {
BCD_TO_BIN(alm_tm->tm_mon);
alm_tm->tm_mon -= 1;
} else {
alm_tm->tm_mon = 0xff;
}
if (alm_en & S3C2410_RTCALM_YEAREN) {
BCD_TO_BIN(alm_tm->tm_year);
} else {
alm_tm->tm_year = 0xffff;
}
/* todo - set alrm->enabled ? */
return 0;
}
static int s3c2410_rtc_setalarm(struct rtc_wkalrm *alrm)
{
struct rtc_time *tm = &alrm->time;
unsigned int alrm_en;
pr_debug("s3c2410_rtc_setalarm: %d, %02x/%02x/%02x %02x.%02x.%02x\n",
alrm->enabled,
tm->tm_mday & 0xff, tm->tm_mon & 0xff, tm->tm_year & 0xff,
tm->tm_hour & 0xff, tm->tm_min & 0xff, tm->tm_sec);
if (alrm->enabled || 1) {
alrm_en = readb(S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
writeb(0x00, S3C2410_RTCALM);
if (tm->
|