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/*
* Copyright (c) 2008-2009 Nuvoton technology corporation.
*
* Wan ZongShun <mcuos.com@gmail.com>
*
* 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;version 2 of the License.
*
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/rtc.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/bcd.h>
/* RTC Control Registers */
#define REG_RTC_INIR 0x00
#define REG_RTC_AER 0x04
#define REG_RTC_FCR 0x08
#define REG_RTC_TLR 0x0C
#define REG_RTC_CLR 0x10
#define REG_RTC_TSSR 0x14
#define REG_RTC_DWR 0x18
#define REG_RTC_TAR 0x1C
#define REG_RTC_CAR 0x20
#define REG_RTC_LIR 0x24
#define REG_RTC_RIER 0x28
#define REG_RTC_RIIR 0x2C
#define REG_RTC_TTR 0x30
#define RTCSET 0x01
#define AERRWENB 0x10000
#define INIRRESET 0xa5eb1357
#define AERPOWERON 0xA965
#define AERPOWEROFF 0x0000
#define LEAPYEAR 0x0001
#define TICKENB 0x80
#define TICKINTENB 0x0002
#define ALARMINTENB 0x0001
#define MODE24 0x0001
struct nuc900_rtc {
int irq_num;
void __iomem *rtc_reg;
struct rtc_device *rtcdev;
};
struct nuc900_bcd_time {
int bcd_sec;
int bcd_min;
int bcd_hour;
int bcd_mday;
int bcd_mon;
int bcd_year;
};
static irqreturn_t nuc900_rtc_interrupt(int irq, void *_rtc)
{
struct nuc900_rtc *rtc = _rtc;
unsigned long events = 0, rtc_irq;
rtc_irq = __raw_readl(rtc->rtc_reg + REG_RTC_RIIR);
if (rtc_irq & ALARMINTENB) {
rtc_irq &= ~ALARMINTENB;
__raw_writel(rtc_irq, rtc->rtc_reg + REG_RTC_RIIR);
events |= RTC_AF | RTC_IRQF;
}
if (rtc_irq & TICKINTENB) {
rtc_irq &= ~TICKINTENB;
__raw_writel(rtc_irq, rtc->rtc_reg + REG_RTC_RIIR);
events |= RTC_UF | RTC_IRQF;
}
rtc_update_irq(rtc->rtcdev, 1, events);
return IRQ_HANDLED;
}
static int *check_rtc_access_enable(struct nuc900_rtc *nuc900_rtc)
{
unsigned int i;
__raw_writel(INIRRESET, nuc900_rtc->rtc_reg + REG_RTC_INIR);
mdelay(10);
__raw_writel(AERPOWERON, nuc900_rtc->rtc_reg + REG_RTC_AER);
for (i = 0; i < 1000; i++) {
if (__raw_readl(nuc900_rtc->rtc_reg + REG_RTC_AER) & AERRWENB)
return 0;
}
if ((__raw_readl(nuc900_rtc->rtc_reg + REG_RTC_AER) & AERRWENB) == 0x0)
return ERR_PTR(-ENODEV);
return ERR_PTR(-EPERM);
}
static void nuc900_rtc_bcd2bin(unsigned int timereg,
unsigned int calreg, struct rtc_time *tm)
{
tm->tm_mday = bcd2bin(calreg >> 0);
tm->tm_mon = bcd2bin(calreg >> 8);
tm->tm_year = bcd2bin(calreg >> 16) + 100;
tm->tm_sec = bcd2bin(timereg >> 0);
tm->tm_min = bcd2bin(timereg >> 8);
tm->tm_hour = bcd2bin(timereg >> 16);
rtc_valid_tm(tm);
}
static void nuc900_rtc_bin2bcd(struct rtc_time *settm,
struct nuc900_bcd_time *gettm)
{
gettm->bcd_mday = bin2bcd(settm->tm_mday) << 0;
gettm->bcd_mon = bin2bcd(settm->tm_mon) << 8;
gettm->bcd_year = bin2bcd(settm->tm_year - 100) << 16;
gettm->bcd_sec = bin2bcd(settm->tm_sec) << 0;
gettm->bcd_min = bin2bcd(settm->tm_min) << 8;
gettm->bcd_hour = bin2bcd(settm->tm_hour) << 16;
}
static int nuc900_update_irq_enable(struct device *dev, unsigned int enabled)
{
struct nuc900_rtc *rtc = dev_get_drvdata(dev);
if (enabled)
__raw_writel(__raw_readl(rtc->rtc_reg + REG_RTC_RIER)|
(TICKINTENB), rtc->rtc_reg + REG_RTC_RIER);
else
__raw_writel(__raw_readl(rtc->rtc_reg + REG_RTC_RIER)&
(~TICKINTENB), rtc->rtc_reg + REG_RTC_RIER);
return 0;
}
static int nuc900_alarm_irq_enable(struct device *dev, unsigned int enabled)
{
struct nuc900_rtc *rtc = dev_get_drvdata(dev);
if (enabled)
__raw_writel(__raw_readl(rtc->rtc_reg + REG_RTC_RIER)|
(ALARMINTENB), rtc->rtc_reg + REG_RTC_RIER);
else
__raw_writel(__raw_readl(rtc->rtc_reg + REG_RTC_RIER)&
(~ALARMINTENB), rtc->rtc_reg + REG_RTC_RIER);
return 0;
}
static int nuc900_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
struct nuc900_rtc *rtc = dev_get_drvdata(dev);
unsigned int timeval, clrval;
timeval = __raw_readl(rtc->rtc_reg + REG_RTC_TLR);
clrval = __raw_readl(rtc->rtc_reg + REG_RTC_CLR);
nuc900_rtc_bcd2bin(timeval, clrval, tm);
return 0;
}
static int nuc900_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
struct nuc900_rtc *rtc = dev_get_drvdata(dev);
struct nuc900_bcd_time gettm;
unsigned long val;
int *err;
nuc900_rtc_bin2bcd(tm, &gettm);
err = check_rtc_access_enable(rtc);
if (IS_ERR(err))
return PTR_ERR(err);
val = gettm.bcd_mday | gettm.bcd_mon | gettm.bcd_year;
__raw_writel(val, rtc->rtc_reg + REG_RTC_CLR);
val = gettm.bcd_sec | gettm.bcd_min | gettm.bcd_hour;
__raw_writel(val, rtc->rtc_reg + REG_RTC_TLR);
return 0;
}
static int nuc900_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct nuc900_rtc *rtc = dev_get_drvdata(dev);
unsigned int timeval, carval;
timeval = __raw_readl(rtc->rtc_reg + REG_RTC_TAR);
carval = __raw_readl(rtc->rtc_reg + REG_RTC_CAR);
nuc900_rtc_bcd2bin(timeval, carval, &alrm->time);
return 0;
}
static int nuc900_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct nuc900_rtc *rtc = dev_get_drvdata(dev);
struct nuc900_bcd_time tm;
unsigned long val;
int *err;
nuc900_rtc_bin2bcd(&alrm->time, &tm);
err = check_rtc_access_enable(rtc);
if (IS_ERR(err))
return PTR_ERR(err);
val = tm.bcd_mday | tm.bcd_mon | tm.bcd_year;
__raw_writel(val, rtc->rtc_reg + REG_RTC_CAR);
val = tm.bcd_sec | tm.bcd_min | tm.bcd_hour;
__raw_writel(val, rtc->rtc_reg + REG_RTC_TAR);
return 0;
}
static struct rtc_class_ops nuc900_rtc_ops = {
.read_time = nuc900_rtc_read_time,
.set_time = nuc900_rtc_set_time,
.read_alarm = nuc900_rtc_read_alarm,
.set_alarm = nuc900_rtc_set_alarm,
.alarm_irq_enable = nuc900_alarm_irq_enable,
.update_irq_enable = nuc900_update_irq_enable,
};
static int __devinit nuc900_rtc_probe(struct platform_device *pdev)
{
struct resource *res;
struct nuc900_rtc *nuc900_rtc;
int err = 0;
nuc900_rtc = kzalloc(sizeof(struct nuc900_rtc), GFP_KERNEL);
if (!nuc900_rtc) {
dev_err(&pdev->dev, "kzalloc nuc900_rtc failed\n");
return -ENOMEM;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(&pdev->dev, "platform_get_resource failed\n");
err = -ENXIO;
goto fail1;
}
if (!request_mem_region(res->start, resource_size(res),
pdev->name)) {
dev_err(&pdev->dev, "request_mem_region failed\n");
err = -EBUSY;
goto
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