- 根目录:
- drivers
- rtc
- rtc-s3c.c
/* drivers/rtc/rtc-s3c.c
*
* Copyright (c) 2010 Samsung Electronics Co., Ltd.
* http://www.samsung.com/
*
* Copyright (c) 2004,2006 Simtec Electronics
* Ben Dooks, <ben@simtec.co.uk>
* http://armlinux.simtec.co.uk/
*
* 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/S3C2440/S3C24XX Internal RTC Driver
*/
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/rtc.h>
#include <linux/bcd.h>
#include <linux/clk.h>
#include <linux/log2.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/uaccess.h>
#include <linux/io.h>
#include <asm/irq.h>
#include "rtc-s3c.h"
struct s3c_rtc {
struct device *dev;
struct rtc_device *rtc;
void __iomem *base;
struct clk *rtc_clk;
struct clk *rtc_src_clk;
bool enabled;
struct s3c_rtc_data *data;
int irq_alarm;
int irq_tick;
spinlock_t pie_lock;
spinlock_t alarm_clk_lock;
int ticnt_save, ticnt_en_save;
bool wake_en;
};
struct s3c_rtc_data {
int max_user_freq;
bool needs_src_clk;
void (*irq_handler) (struct s3c_rtc *info, int mask);
void (*set_freq) (struct s3c_rtc *info, int freq);
void (*enable_tick) (struct s3c_rtc *info, struct seq_file *seq);
void (*select_tick_clk) (struct s3c_rtc *info);
void (*save_tick_cnt) (struct s3c_rtc *info);
void (*restore_tick_cnt) (struct s3c_rtc *info);
void (*enable) (struct s3c_rtc *info);
void (*disable) (struct s3c_rtc *info);
};
static void s3c_rtc_alarm_clk_enable(struct s3c_rtc *info, bool enable)
{
unsigned long irq_flags;
spin_lock_irqsave(&info->alarm_clk_lock, irq_flags);
if (enable) {
if (!info->enabled) {
clk_enable(info->rtc_clk);
if (info->data->needs_src_clk)
clk_enable(info->rtc_src_clk);
info->enabled = true;
}
} else {
if (info->enabled) {
if (info->data->needs_src_clk)
clk_disable(info->rtc_src_clk);
clk_disable(info->rtc_clk);
info->enabled = false;
}
}
spin_unlock_irqrestore(&info->alarm_clk_lock, irq_flags);
}
/* IRQ Handlers */
static irqreturn_t s3c_rtc_tickirq(int irq, void *id)
{
struct s3c_rtc *info = (struct s3c_rtc *)id;
if (info->data->irq_handler)
info->data->irq_handler(info, S3C2410_INTP_TIC);
return IRQ_HANDLED;
}
static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
{
struct s3c_rtc *info = (struct s3c_rtc *)id;
if (info->data->irq_handler)
info->data->irq_handler(info, S3C2410_INTP_ALM);
return IRQ_HANDLED;
}
/* Update control registers */
static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
{
struct s3c_rtc *info = dev_get_drvdata(dev);
unsigned int tmp;
dev_dbg(info->dev, "%s: aie=%d\n", __func__, enabled);
clk_enable(info->rtc_clk);
if (info->data->needs_src_clk)
clk_enable(info->rtc_src_clk);
tmp = readb(info->base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
if (enabled)
tmp |= S3C2410_RTCALM_ALMEN;
writeb(tmp, info->base + S3C2410_RTCALM);
if (info->data->needs_src_clk)
clk_disable(info->rtc_src_clk);
clk_disable(info->rtc_clk);
s3c_rtc_alarm_clk_enable(info, enabled);
return 0;
}
/* Set RTC frequency */
static int s3c_rtc_setfreq(struct s3c_rtc *info, int freq)
{
if (!is_power_of_2(freq))
return -EINVAL;
clk_enable(info->rtc_clk);
if (info->data->needs_src_clk)
clk_enable(info->rtc_src_clk);
spin_lock_irq(&info->pie_lock);
if (info->data->set_freq)
info->data->set_freq(info, freq);
spin_unlock_irq(&info->pie_lock);
if (info->data->needs_src_clk)
clk_disable(info->rtc_src_clk);
clk_disable(info->rtc_clk);
return 0;
}
/* Time read/write */
static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
{
struct s3c_rtc *info = dev_get_drvdata(dev);
unsigned int have_retried = 0;
clk_enable(info->rtc_clk);
if (info->data->needs_src_clk)
clk_enable(info->rtc_src_clk);
retry_get_time:
rtc_tm->tm_min = readb(info->base + S3C2410_RTCMIN);
rtc_tm->tm_hour = readb(info->base + S3C2410_RTCHOUR);
rtc_tm->tm_mday = readb(info->base + S3C2410_RTCDATE);
rtc_tm->tm_mon = readb(info->base + S3C2410_RTCMON);
rtc_tm->tm_year = readb(info->base + S3C2410_RTCYEAR);
rtc_tm->tm_sec = readb(info->base + S3C2410_RTCSEC);
/* the only way to work out whether 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;
}
rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);
rtc_tm->tm_year += 100;
dev_dbg(dev, "read time %04d.%02d.%02d %02d:%02d:%02d\n",
1900 + rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday,
rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);
rtc_tm->tm_mon -= 1;
if (info->data->needs_src_clk)
clk_disable(info->rtc_src_clk);
clk_disable(info->rtc_clk);
return rtc_valid_tm(rtc_tm);
}
static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
{
struct s3c_rtc *info = dev_get_drvdata(dev);
int year = tm->tm_year - 100;
dev_dbg(dev, "set time %04d.%02d.%02d %02d:%02d:%02d\n",
1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
tm->tm_hour, tm->tm_min, tm->tm_sec);
/* we get around y2k by simply not supporting it */
if (year < 0 || year >= 100) {
dev_err(dev, "rtc only supports 100 years\n");
return -EINVAL;
}
clk_enable(info->rtc_clk);
if (info->data->needs_src_clk)
clk_enable(info->rtc_src_clk);
writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_RTCSEC);
writeb(bin2bcd(tm->tm_min), info->base + S3C2410_RTCMIN);
writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_RTCHOUR);
writeb(bin2bcd(tm->tm_mday), info->base + S3C2410_RTCDATE);
writeb(bin2bcd(tm->tm_mon + 1), info->base + S3C2410_RTCMON);
writeb(bin2bcd(year), info->base + S3C2410_RTCYEAR);
if (info->data->needs_src_clk)
clk_disable(info->rtc_src_clk);
clk_disable(info->rtc_clk);
return 0;
}
static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct s3c_rtc *info = dev_get_drvdata(dev);
struct rtc_time *alm_tm = &alrm->time;
unsigned int alm_en;
clk_enable(info->rtc_clk);
if (info->data->needs_src_clk)
clk_enable(info->rtc_src_clk);
alm_tm->tm_sec = readb(info->base + S3C2410_ALMSEC);
alm_tm->tm_min = readb(info->base + S3C2410_ALMMIN);
alm_tm->tm_hour = readb(info->base + S3C2410_ALMHOUR);
alm_tm->tm_mon = readb(info->base + S3C2410_ALMMON);
alm_tm->tm_mday = readb(info->base + S3C2410_ALMDATE);
alm_tm->tm_year = readb(info->base + S3C2410_ALMYEAR);
alm_en = readb(info->base + S3C2410_RTCALM);
alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0;
dev_dbg(dev, "read alarm %d, %04d.%02d.%02d %02d:%02d:%02d\n",
alm_en,
1900 + 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)
alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec);
else
alm_tm->tm_sec = -1;
if (alm_en & S3C2410_RTCALM_MINEN)
alm_tm->tm_min = bcd2bin(alm_tm->tm_min);
else
alm_tm->tm_min = -1;
if (alm_en & S3C2410_RTCALM_HOUREN)
alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour);
else
alm_tm->tm_hour = -1;
if (alm_en & S3C2410_RTCALM_DAYEN)
alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday);
else
alm_tm->tm_mday = -1;
if (alm_en & S3C2410_RTCALM_MONEN) {
alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon);
alm_tm->tm_mon -= 1;
} else {
alm_tm->tm_mon = -1;
}
if (alm_en & S3C2410_RTCALM_YEAREN)
alm_tm->tm_year = bcd2bin(alm_tm->tm_year);
else
alm_tm->tm_year = -1;
if (info->data->needs_src_clk)
clk_disable(info->rtc_src_clk);
clk_disable(info->rtc_clk);
return 0;
}
static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct s3c_rtc *info = dev_get_drvdata(dev);
struct rtc_time *tm = &alrm->time;
unsigned int alrm_en;
clk_enable(info->rtc_clk);
if (info->data->needs_src_clk)
clk_enable(info->rtc_src_clk);
dev_dbg(dev, "s3c_rtc_setalarm: %d, %04d.%02d.%02d %02d:%02d:%02d\n",
alrm->enabled,
1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
tm->tm_hour, tm->tm_min, tm->tm_sec);
alrm_en = readb(info->base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
writeb(0x00, info->base + S3C2410_RTCALM);
if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
alrm_en |= S3C2410_RTCALM_SECEN;
writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_ALMSEC);
}
if (tm->tm_min < 60 && tm->tm_min >= 0) {
alrm_en |= S3C2410_RTCALM_MINEN;
writeb(bin2bcd(tm->tm_min), info->base + S3C2410_ALMMIN);
}
if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
alrm_en |= S3C2410_RTCALM_HOUREN;
writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_ALMHOUR);
}
dev_dbg(dev, "setting S3C2410_RTCALM to %08x\n", alrm_en);
writeb(alrm_en, info->base + S3C2410_RTCALM);
s3c_rtc_setaie(dev, alrm->enabled);
if (info->data->needs_src_clk)
clk_disable(info->rtc_src_clk);
clk_disable(info->rtc_clk);
return 0;
}
static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
{
struct s3c_rtc *info = dev_get_drvdata(dev);
clk_enable(info->rtc_clk);
if (info->data->needs_src_clk)
clk_enable(info->rtc_src_clk);
if (info->data->enable_tick)
info->data->enable_tick(info, seq);
if (info->data->needs_src_clk)
clk_disable(info->rtc_src_clk);
clk_disable(info->rtc_clk);
return 0;
}
static const struct rtc_class_ops s3c_rtcops = {
.read_time = s3c_rtc_gettime,
.set_time = s3c_rtc_settime,
.read_alarm = s3c_rtc_getalarm,
.set_alarm = s3c_rtc_setalarm,
.proc = s3c_rtc_proc,
.alarm_irq_enable = s3c_rtc_setaie,
};
static void s3c24xx_rtc_enable(struct s3c_rtc *info)
{
unsigned int con, tmp;
clk_enable(info->rtc_clk);
if (info->data->needs_src_clk)
clk_enable(info->rtc_src_clk);
con = readw(info->base + S3C2410_RTCCON);
/* re-enable the device, and check it is ok */
if ((con & S3C2410_RTCCON_RTCEN) == 0) {
dev_info(info->dev, "rtc disabled, re-enabling\n");
tmp = readw(info->base + S3C2410_RTCCON);
writew(tmp | S3C2410_RTCCON_RTCEN,
info->base + S3C2410_RTCCON);
}
if (con & S3C2410_RTCCON_CNTSEL) {
dev_info(info->dev, "removing RTCCON_CNTSEL\n");
tmp = readw(info->base + S3C2410_RTCCON);
writew(tmp & ~S3C2410_RTCCON_CNTSEL,
info->base + S3C2410_RTCCON);
}
if (con & S3C2410_RTCCON_CLKRST) {
dev_info(info->dev, "removing RTCCON_CLKRST\n");
tmp = readw(info->base + S3C2410_RTCCON);
writew(tmp & ~S3C2410_RTCCON_CLKRST,
info->base + S3C2410_RTCCON);
}
if (info->data->needs_src_clk)
clk_disable(info->rtc_src_clk);
clk_disable(info->rtc_clk);
}
static void s3c24xx_rtc_disable(struct s3c_rtc *info)
{
unsigned int con;
clk_enable(info->rtc_clk);
if (info->data->needs_src_clk)
clk_enable(info->rtc_src_clk);
con = readw(info->base + S3C2410_RTCCON);
con &= ~S3C2410_RTCCON_RTCEN;
writew(con, info->base + S3C2410_RTCCON);
con = readb(info->base + S3C2410_TICNT);
con &= ~S3C2410_TICNT_ENABLE;
writeb(con, info->base + S3C2410_TICNT);
if (info->data->needs_src_clk)
clk_disable(info->rtc_src_clk);
clk_disable(info->rtc_clk);
}
static void s3c6410_rtc_disable(struct s3c_rtc *info)
{
unsigned int con;
clk_enable(info->rtc_clk);
if (info->data->needs_src_clk)
clk_enable(info->rtc_src_clk);
con = readw(info->base + S3C2410_RTCCON);
con &= ~S3C64XX_RTCCON_TICEN;
con &= ~S3C2410_RTCCON_RTCEN;
writew(con, info->base + S3C2410_RTCCON);
if (info->data->needs_src_clk)
clk_disable(info->rtc_src_clk);
clk_disable(info->rtc_clk);
}
static int s3c_rtc_remove(struct platform_device *pdev)
{
struct s3c_rtc *info = platform_get_drvdata(pdev);
s3c_rtc_setaie(info->dev, 0);
clk_unprepare(info->rtc_clk);
info->rtc_clk = NULL;
return 0;
}
static const struct of_device_id s3c_rtc_dt_match[];
static struct s3c_rtc_data *s3c_rtc_get_data(struct platform_device *pdev)
{
const struct of_device_id *match;
match = of_match_node(s3c_rtc_dt_match, pdev->dev.of_node);
return (struct s3c_rtc_data *)match->data;
}
static int s3c_rtc_probe(struct platform_device *pdev)
{
struct s3c_rtc *info = NULL;
struct rtc_time rtc_tm;
struct resource *res;
int ret;
info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
if (!info)
return -ENOMEM;
/* find the IRQs */
info->irq_tick = platform_get_irq(pdev, 1);
if (info->irq_tick < 0) {
dev_err(&pdev->dev, "no irq for rtc tick\n");
return info->irq_tick;
}
info->dev = &pdev->dev;
info->data = s3c_rtc_get_data(pdev);
if (!info->data) {
dev_err(&pdev->dev, "failed getting s3c_rtc_data\n");
return -EINVAL;
}
spin_lock_init(&info->pie_lock);
spin_lock_init(&info->alarm_clk_lock);
platform_set_drvdata(pdev, info);
info->irq_alarm = platform_get_irq(pdev, 0);
if (info->irq_alarm < 0) {
dev_err(&pdev->dev, "no irq for alarm\n");
return info->irq_alarm;
}
dev_dbg(&pdev->dev, "s3c2410_rtc: tick irq %d, alarm irq %d\n",
info->irq_tick, info->irq_alarm);
/* get the memory region */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
info->base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(info->base))
return PTR_ERR(info->base);
info->rtc_clk = devm_clk_get(&pdev->dev, "rtc");
if (IS_ERR(info->rtc_clk)) {
dev_err(&pdev->dev, "failed to find rtc clock\n");
return PTR_ERR(info->rtc_clk);
}
clk_prepare_enable(info->rtc_clk);
if (info->data->needs_src_clk) {
info->rtc_src_clk = devm_clk_get(&pdev->dev, "rtc_src");
if (IS_ERR(info->rtc_src_clk)) {
dev_err(&pdev->dev,
"failed to find rtc source clock\n");
return PTR_ERR(info->rtc_src_clk);
}
clk_prepare_enable(info->rtc_src_clk);
}
/* check to see if everything is setup correctly */
if (info->data->enable)
info->data->enable(info);
dev_dbg(&pdev->dev, "s3c2410_rtc: RTCCON=%02x\n",
readw(info->base + S3C2410_RTCCON));
device_init_wakeup(&pdev->dev, 1);
/* register RTC and exit */
info->rtc = devm_rtc_device_register(&pdev->dev, "s3c", &s3c_rtcops,
THIS_MODULE);
if (IS_ERR(info->rtc)) {
dev_err(&pdev->dev, "cannot attach rtc\n");
ret = PTR_ERR(info->rtc);
goto err_nortc;
}
ret = devm_request_irq(&pdev->dev, info->irq_alarm, s3c_rtc_alarmirq,
0, "s3c2410-rtc alarm", info);
if (ret) {
dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_alarm, ret);
goto err_nortc;
}
ret = devm_request_irq(&pdev->dev, info->irq_tick, s3c_rtc_tickirq,
0, "s3c2410-rtc tick", info);
if (ret) {
dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_tick, ret);
goto err_nortc;
}
/* Check RTC Time */
s3c_rtc_gettime(&pdev->dev, &rtc_tm);
if (rtc_valid_tm(&rtc_tm)) {
rtc_tm.tm_year = 100;
rtc_tm.tm_mon = 0;
rtc_tm.tm_mday = 1;
rtc_tm.tm_hour = 0;
rtc_tm.tm_min = 0;
rtc_tm.tm_sec = 0;
s3c_rtc_settime(&pdev->dev, &rtc_tm);
dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n");
}
if (info->data->select_tick_clk)
info->data->select_tick_clk(info);
s3c_rtc_setfreq(info, 1);
if (info->data->needs_src_clk)
clk_disable(info->rtc_src_clk);
clk_disable(info->rtc_clk);
return 0;
err_nortc:
if (info->data->disable)
info->data->disable(info);
clk_disable_unprepare(info->rtc_clk);
return ret;
}
#ifdef CONFIG_PM_SLEEP
static int s3c_rtc_suspend(struct device *dev)
{
struct s3c_rtc *info = dev_get_drvdata(dev);
clk_enable(info->rtc_clk);
if (info->data->needs_src_clk)
clk_enable(info->rtc_src_clk);
/* save TICNT for anyone using periodic interrupts */
if (info->data->save_tick_cnt)
info->data->save_tick_cnt(info);
if (info->data->disable)
info->data->disable(info);
if (device_may_wakeup(dev) && !info->wake_en) {
if (enable_irq_wake(info->irq_alarm) == 0)
info->wake_en = true;
else
dev_err(dev, "enable_irq_wake failed\n");
}
if (info->data->needs_src_clk)
clk_disable(info->rtc_src_clk);
clk_disable(info->rtc_clk);
return 0;
}
static int s3c_rtc_resume(struct device *dev)
{
struct s3c_rtc *info = dev_get_drvdata(dev);
clk_enable(info->rtc_clk);
if (info->data->needs_src_clk)
clk_enable(info->rtc_src_clk);
if (info->data->enable)
info->data->enable(info);
if (info->data->restore_tick_cnt)
info->data->restore_tick_cnt(info);
if (device_may_wakeup(dev) && info->wake_en) {
disable_irq_wake(info->irq_alarm);
info->wake_en = false;
}
if (info->data->needs_src_clk)
clk_disable(info->rtc_src_clk);
clk_disable(info->rtc_clk);
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(s3c_rtc_pm_ops, s3c_rtc_suspend, s3c_rtc_resume);
static void s3c24xx_rtc_irq(struct s3c_rtc *info, int mask)
{
clk_enable(info->rtc_clk);
if (info->data->needs_src_clk)
clk_enable(info->rtc_src_clk);
rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF);
if (info->data->needs_src_clk)
clk_disable(info->rtc_src_clk);
clk_disable(info->rtc_clk);
s3c_rtc_alarm_clk_enable(info, false);
}
static void s3c6410_rtc_irq(struct s3c_rtc *info, int mask)
{
clk_enable(info->rtc_clk);
if (info->data->needs_src_clk)
clk_enable(info->rtc_src_clk);
rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF);
writeb(mask, info->base + S3C2410_INTP);
if (info->data->needs_src_clk)
clk_disable(info->rtc_src_clk);
clk_disable(info->rtc_clk);
s3c_rtc_alarm_clk_enable(info, false);
}
static void s3c2410_rtc_setfreq(struct s3c_rtc *info, int freq)
{
unsigned int tmp = 0;
int val;
tmp = readb(info->base + S3C2410_TICNT);
tmp &= S3C2410_TICNT_ENABLE;
val = (info->rtc->max_user_freq / freq) - 1;
tmp |= val;
writel(tmp, info->base + S3C2410_TICNT);
}
static void s3c2416_rtc_setfreq(struct s3c_rtc *info, int freq)
{
unsigned int tmp = 0;
int val;
tmp = readb(info->base + S3C2410_TICNT);
tmp &= S3C2410_TICNT_ENABLE;
val = (info->rtc->max_user_freq / freq) - 1;
tmp |= S3C2443_TICNT_PART(val);
writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1);
writel(S3C2416_TICNT2_PART(val), info->base + S3C2416_TICNT2);
writel(tmp, info->base + S3C2410_TICNT);
}
static void s3c2443_rtc_setfreq(struct s3c_rtc *info, int freq)
{
unsigned int tmp = 0;
int val;
tmp = readb(info->base + S3C2410_TICNT);
tmp &= S3C2410_TICNT_ENABLE;
val = (info->rtc->max_user_freq / freq) - 1;
tmp |= S3C2443_TICNT_PART(val);
writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1);
writel(tmp, info->base + S3C2410_TICNT);
}
static void s3c6410_rtc_setfreq(struct s3c_rtc *info, int freq)
{
int val;
val = (info->rtc->max_user_freq / freq) - 1;
writel(val, info->base + S3C2410_TICNT);
}
static void s3c24xx_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq)
{
unsigned int ticnt;
ticnt = readb(info->base + S3C2410_TICNT);
ticnt &= S3C2410_TICNT_ENABLE;
seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no");
}
static void s3c2416_rtc_select_tick_clk(struct s3c_rtc *info)
{
unsigned int con;
con = readw(info->base + S3C2410_RTCCON);
con |= S3C2443_RTCCON_TICSEL;
writew(con, info->base + S3C2410_RTCCON);
}
static void s3c6410_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq)
{
unsigned int ticnt;
ticnt = readw(info->base + S3C2410_RTCCON);
ticnt &= S3C64XX_RTCCON_TICEN;
seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no");
}
static void s3c24xx_rtc_save_tick_cnt(struct s3c_rtc *info)
{
info->ticnt_save = readb(info->base + S3C2410_TICNT);
}
static void s3c24xx_rtc_restore_tick_cnt(struct s3c_rtc *info)
{
writeb(info->ticnt_save, info->base + S3C2410_TICNT);
}
static void s3c6410_rtc_save_tick_cnt(struct s3c_rtc *info)
{
info->ticnt_en_save = readw(info->base + S3C2410_RTCCON);
info->ticnt_en_save &= S3C64XX_RTCCON_TICEN;
info->ticnt_save = readl(info->base + S3C2410_TICNT);
}
static void s3c6410_rtc_restore_tick_cnt(struct s3c_rtc *info)
{
unsigned int con;
writel(info->ticnt_save, info->base + S3C2410_TICNT);
if (info->ticnt_en_save) {
con = readw(info->base + S3C2410_RTCCON);
writew(con | info->ticnt_en_save,
info->base + S3C2410_RTCCON);
}
}
static struct s3c_rtc_data const s3c2410_rtc_data = {
.max_user_freq = 128,
.irq_handler = s3c24xx_rtc_irq,
.set_freq = s3c2410_rtc_setfreq,
.enable_tick = s3c24xx_rtc_enable_tick,
.save_tick_cnt = s3c24xx_rtc_save_tick_cnt,
.restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt,
.enable = s3c24xx_rtc_enable,
.disable = s3c24xx_rtc_disable,
};
static struct s3c_rtc_data const s3c2416_rtc_data = {
.max_user_freq = 32768,
.irq_handler = s3c24xx_rtc_irq,
.set_freq = s3c2416_rtc_setfreq,
.enable_tick = s3c24xx_rtc_enable_tick,
.select_tick_clk = s3c2416_rtc_select_tick_clk,
.save_tick_cnt = s3c24xx_rtc_save_tick_cnt,
.restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt,
.enable = s3c24xx_rtc_enable,
.disable = s3c24xx_rtc_disable,
};
static struct s3c_rtc_data const s3c2443_rtc_data = {
.max_user_freq = 32768,
.irq_handler = s3c24xx_rtc_irq,
.set_freq = s3c2443_rtc_setfreq,
.enable_tick = s3c24xx_rtc_enable_tick,
.select_tick_clk = s3c2416_rtc_select_tick_clk,
.save_tick_cnt = s3c24xx_rtc_save_tick_cnt,
.restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt,
.enable = s3c24xx_rtc_enable,
.disable = s3c24xx_rtc_disable,
};
static struct s3c_rtc_data const s3c6410_rtc_data = {
.max_user_freq = 32768,
.irq_handler = s3c6410_rtc_irq,
.set_freq = s3c6410_rtc_setfreq,
.enable_tick = s3c6410_rtc_enable_tick,
.save_tick_cnt = s3c6410_rtc_save_tick_cnt,
.restore_tick_cnt = s3c6410_rtc_restore_tick_cnt,
.enable = s3c24xx_rtc_enable,
.disable = s3c6410_rtc_disable,
};
static struct s3c_rtc_data const exynos3250_rtc_data = {
.max_user_freq = 32768,
.needs_src_clk = true,
.irq_handler = s3c6410_rtc_irq,
.set_freq = s3c6410_rtc_setfreq,
.enable_tick = s3c6410_rtc_enable_tick,
.save_tick_cnt = s3c6410_rtc_save_tick_cnt,
.restore_tick_cnt = s3c6410_rtc_restore_tick_cnt,
.enable = s3c24xx_rtc_enable,
.disable = s3c6410_rtc_disable,
};
static const struct of_device_id s3c_rtc_dt_match[] = {
{
.compatible = "samsung,s3c2410-rtc",
.data = (void *)&s3c2410_rtc_data,
}, {
.compatible = "samsung,s3c2416-rtc",
.data = (void *)&s3c2416_rtc_data,
}, {
.compatible = "samsung,s3c2443-rtc",
.data = (void *)&s3c2443_rtc_data,
}, {
.compatible = "samsung,s3c6410-rtc",
.data = (void *)&s3c6410_rtc_data,
}, {
.compatible = "samsung,exynos3250-rtc",
.data = (void *)&exynos3250_rtc_data,
},
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, s3c_rtc_dt_match);
static struct platform_driver s3c_rtc_driver = {
.probe = s3c_rtc_probe,
.remove = s3c_rtc_remove,
.driver = {
.name = "s3c-rtc",
.owner = THIS_MODULE,
.pm = &s3c_rtc_pm_ops,
.of_match_table = of_match_ptr(s3c_rtc_dt_match),
},
};
module_platform_driver(s3c_rtc_driver);
MODULE_DESCRIPTION("Samsung S3C RTC Driver");
MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:s3c2410-rtc");