5a5b614ba6
s3c_rtc_enable/disable_clk() functions were designed to be called multiple times without reference counting, because they were initially only used in alarm setting/clearing functions, which can be called both when alarm is already set or not. Later however, calls to those functions have been added to other places in the driver - like time and /proc reading callbacks, what results in broken alarm if any of such events happens after the alarm has been set. Fix this by simplifying s3c_rtc_enable/disable_clk() functions to rely on proper reference counting in clock core and move alarm enable counter to s3c_rtc_setaie() function. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
853 lines
20 KiB
C
853 lines
20 KiB
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 alarm_enabled;
|
|
|
|
const struct s3c_rtc_data *data;
|
|
|
|
int irq_alarm;
|
|
int irq_tick;
|
|
|
|
spinlock_t pie_lock;
|
|
spinlock_t alarm_lock;
|
|
|
|
int ticnt_save;
|
|
int 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 int s3c_rtc_enable_clk(struct s3c_rtc *info)
|
|
{
|
|
int ret;
|
|
|
|
ret = clk_enable(info->rtc_clk);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (info->data->needs_src_clk) {
|
|
ret = clk_enable(info->rtc_src_clk);
|
|
if (ret) {
|
|
clk_disable(info->rtc_clk);
|
|
return ret;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void s3c_rtc_disable_clk(struct s3c_rtc *info)
|
|
{
|
|
if (info->data->needs_src_clk)
|
|
clk_disable(info->rtc_src_clk);
|
|
clk_disable(info->rtc_clk);
|
|
}
|
|
|
|
/* 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 long flags;
|
|
unsigned int tmp;
|
|
int ret;
|
|
|
|
dev_dbg(info->dev, "%s: aie=%d\n", __func__, enabled);
|
|
|
|
ret = s3c_rtc_enable_clk(info);
|
|
if (ret)
|
|
return ret;
|
|
|
|
tmp = readb(info->base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
|
|
|
|
if (enabled)
|
|
tmp |= S3C2410_RTCALM_ALMEN;
|
|
|
|
writeb(tmp, info->base + S3C2410_RTCALM);
|
|
|
|
spin_lock_irqsave(&info->alarm_lock, flags);
|
|
|
|
if (info->alarm_enabled && !enabled)
|
|
s3c_rtc_disable_clk(info);
|
|
else if (!info->alarm_enabled && enabled)
|
|
ret = s3c_rtc_enable_clk(info);
|
|
|
|
info->alarm_enabled = enabled;
|
|
spin_unlock_irqrestore(&info->alarm_lock, flags);
|
|
|
|
s3c_rtc_disable_clk(info);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Set RTC frequency */
|
|
static int s3c_rtc_setfreq(struct s3c_rtc *info, int freq)
|
|
{
|
|
int ret;
|
|
|
|
if (!is_power_of_2(freq))
|
|
return -EINVAL;
|
|
|
|
ret = s3c_rtc_enable_clk(info);
|
|
if (ret)
|
|
return ret;
|
|
spin_lock_irq(&info->pie_lock);
|
|
|
|
if (info->data->set_freq)
|
|
info->data->set_freq(info, freq);
|
|
|
|
spin_unlock_irq(&info->pie_lock);
|
|
s3c_rtc_disable_clk(info);
|
|
|
|
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;
|
|
int ret;
|
|
|
|
ret = s3c_rtc_enable_clk(info);
|
|
if (ret)
|
|
return ret;
|
|
|
|
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);
|
|
|
|
s3c_rtc_disable_clk(info);
|
|
|
|
rtc_tm->tm_year += 100;
|
|
rtc_tm->tm_mon -= 1;
|
|
|
|
dev_dbg(dev, "read time %ptR\n", rtc_tm);
|
|
return 0;
|
|
}
|
|
|
|
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;
|
|
int ret;
|
|
|
|
dev_dbg(dev, "set time %ptR\n", tm);
|
|
|
|
/* 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;
|
|
}
|
|
|
|
ret = s3c_rtc_enable_clk(info);
|
|
if (ret)
|
|
return ret;
|
|
|
|
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);
|
|
|
|
s3c_rtc_disable_clk(info);
|
|
|
|
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;
|
|
int ret;
|
|
|
|
ret = s3c_rtc_enable_clk(info);
|
|
if (ret)
|
|
return ret;
|
|
|
|
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);
|
|
|
|
s3c_rtc_disable_clk(info);
|
|
|
|
alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0;
|
|
|
|
dev_dbg(dev, "read alarm %d, %ptR\n", alm_en, alm_tm);
|
|
|
|
/* decode the alarm enable field */
|
|
if (alm_en & S3C2410_RTCALM_SECEN)
|
|
alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec);
|
|
|
|
if (alm_en & S3C2410_RTCALM_MINEN)
|
|
alm_tm->tm_min = bcd2bin(alm_tm->tm_min);
|
|
|
|
if (alm_en & S3C2410_RTCALM_HOUREN)
|
|
alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour);
|
|
|
|
if (alm_en & S3C2410_RTCALM_DAYEN)
|
|
alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday);
|
|
|
|
if (alm_en & S3C2410_RTCALM_MONEN) {
|
|
alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon);
|
|
alm_tm->tm_mon -= 1;
|
|
}
|
|
|
|
if (alm_en & S3C2410_RTCALM_YEAREN)
|
|
alm_tm->tm_year = bcd2bin(alm_tm->tm_year);
|
|
|
|
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;
|
|
int ret;
|
|
|
|
dev_dbg(dev, "s3c_rtc_setalarm: %d, %ptR\n", alrm->enabled, tm);
|
|
|
|
ret = s3c_rtc_enable_clk(info);
|
|
if (ret)
|
|
return ret;
|
|
|
|
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);
|
|
}
|
|
|
|
if (tm->tm_mon < 12 && tm->tm_mon >= 0) {
|
|
alrm_en |= S3C2410_RTCALM_MONEN;
|
|
writeb(bin2bcd(tm->tm_mon + 1), info->base + S3C2410_ALMMON);
|
|
}
|
|
|
|
if (tm->tm_mday <= 31 && tm->tm_mday >= 1) {
|
|
alrm_en |= S3C2410_RTCALM_DAYEN;
|
|
writeb(bin2bcd(tm->tm_mday), info->base + S3C2410_ALMDATE);
|
|
}
|
|
|
|
dev_dbg(dev, "setting S3C2410_RTCALM to %08x\n", alrm_en);
|
|
|
|
writeb(alrm_en, info->base + S3C2410_RTCALM);
|
|
|
|
s3c_rtc_setaie(dev, alrm->enabled);
|
|
|
|
s3c_rtc_disable_clk(info);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
|
|
{
|
|
struct s3c_rtc *info = dev_get_drvdata(dev);
|
|
int ret;
|
|
|
|
ret = s3c_rtc_enable_clk(info);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (info->data->enable_tick)
|
|
info->data->enable_tick(info, seq);
|
|
|
|
s3c_rtc_disable_clk(info);
|
|
|
|
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;
|
|
|
|
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);
|
|
}
|
|
}
|
|
|
|
static void s3c24xx_rtc_disable(struct s3c_rtc *info)
|
|
{
|
|
unsigned int con;
|
|
|
|
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);
|
|
}
|
|
|
|
static void s3c6410_rtc_disable(struct s3c_rtc *info)
|
|
{
|
|
unsigned int con;
|
|
|
|
con = readw(info->base + S3C2410_RTCCON);
|
|
con &= ~S3C64XX_RTCCON_TICEN;
|
|
con &= ~S3C2410_RTCCON_RTCEN;
|
|
writew(con, info->base + S3C2410_RTCCON);
|
|
}
|
|
|
|
static int s3c_rtc_remove(struct platform_device *pdev)
|
|
{
|
|
struct s3c_rtc *info = platform_get_drvdata(pdev);
|
|
|
|
s3c_rtc_setaie(info->dev, 0);
|
|
|
|
if (info->data->needs_src_clk)
|
|
clk_unprepare(info->rtc_src_clk);
|
|
clk_unprepare(info->rtc_clk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id s3c_rtc_dt_match[];
|
|
|
|
static const 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 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_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)) {
|
|
ret = PTR_ERR(info->rtc_clk);
|
|
if (ret != -EPROBE_DEFER)
|
|
dev_err(&pdev->dev, "failed to find rtc clock\n");
|
|
else
|
|
dev_dbg(&pdev->dev, "probe deferred due to missing rtc clk\n");
|
|
return ret;
|
|
}
|
|
ret = clk_prepare_enable(info->rtc_clk);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (info->data->needs_src_clk) {
|
|
info->rtc_src_clk = devm_clk_get(&pdev->dev, "rtc_src");
|
|
if (IS_ERR(info->rtc_src_clk)) {
|
|
ret = PTR_ERR(info->rtc_src_clk);
|
|
if (ret != -EPROBE_DEFER)
|
|
dev_err(&pdev->dev,
|
|
"failed to find rtc source clock\n");
|
|
else
|
|
dev_dbg(&pdev->dev,
|
|
"probe deferred due to missing rtc src clk\n");
|
|
goto err_src_clk;
|
|
}
|
|
ret = clk_prepare_enable(info->rtc_src_clk);
|
|
if (ret)
|
|
goto err_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);
|
|
|
|
/* Check RTC Time */
|
|
if (s3c_rtc_gettime(&pdev->dev, &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");
|
|
}
|
|
|
|
/* 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;
|
|
}
|
|
|
|
if (info->data->select_tick_clk)
|
|
info->data->select_tick_clk(info);
|
|
|
|
s3c_rtc_setfreq(info, 1);
|
|
|
|
s3c_rtc_disable_clk(info);
|
|
|
|
return 0;
|
|
|
|
err_nortc:
|
|
if (info->data->disable)
|
|
info->data->disable(info);
|
|
|
|
if (info->data->needs_src_clk)
|
|
clk_disable_unprepare(info->rtc_src_clk);
|
|
err_src_clk:
|
|
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);
|
|
int ret;
|
|
|
|
ret = s3c_rtc_enable_clk(info);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* 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");
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int s3c_rtc_resume(struct device *dev)
|
|
{
|
|
struct s3c_rtc *info = dev_get_drvdata(dev);
|
|
|
|
if (info->data->enable)
|
|
info->data->enable(info);
|
|
|
|
if (info->data->restore_tick_cnt)
|
|
info->data->restore_tick_cnt(info);
|
|
|
|
s3c_rtc_disable_clk(info);
|
|
|
|
if (device_may_wakeup(dev) && info->wake_en) {
|
|
disable_irq_wake(info->irq_alarm);
|
|
info->wake_en = false;
|
|
}
|
|
|
|
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)
|
|
{
|
|
rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF);
|
|
}
|
|
|
|
static void s3c6410_rtc_irq(struct s3c_rtc *info, int mask)
|
|
{
|
|
rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF);
|
|
writeb(mask, info->base + S3C2410_INTP);
|
|
}
|
|
|
|
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,
|
|
.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 = &s3c2410_rtc_data,
|
|
}, {
|
|
.compatible = "samsung,s3c2416-rtc",
|
|
.data = &s3c2416_rtc_data,
|
|
}, {
|
|
.compatible = "samsung,s3c2443-rtc",
|
|
.data = &s3c2443_rtc_data,
|
|
}, {
|
|
.compatible = "samsung,s3c6410-rtc",
|
|
.data = &s3c6410_rtc_data,
|
|
}, {
|
|
.compatible = "samsung,exynos3250-rtc",
|
|
.data = &s3c6410_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",
|
|
.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");
|