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ARM: NUC900: add RTC driver support for nuc910 and nuc920
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Signed-off-by: Wan ZongShun <mcuos.com@gmail.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Hu Ruihuan <specter118@gmail.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: "jack wang" <jack_wang@usish.com>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Wan ZongShun authored and Linus Torvalds committed Dec 16, 2009
1 parent d973b63 commit afd49a7
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6 changes: 6 additions & 0 deletions drivers/rtc/Kconfig
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Expand Up @@ -601,6 +601,12 @@ config RTC_DRV_AB3100
Select this to enable the ST-Ericsson AB3100 Mixed Signal IC RTC
support. This chip contains a battery- and capacitor-backed RTC.

config RTC_DRV_NUC900
tristate "NUC910/NUC920 RTC driver"
depends on RTC_CLASS && ARCH_W90X900
help
If you say yes here you get support for the RTC subsystem of the
NUC910/NUC920 used in embedded systems.

comment "on-CPU RTC drivers"

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1 change: 1 addition & 0 deletions drivers/rtc/Makefile
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Expand Up @@ -56,6 +56,7 @@ obj-$(CONFIG_RTC_DRV_MAX6902) += rtc-max6902.o
obj-$(CONFIG_RTC_DRV_MC13783) += rtc-mc13783.o
obj-$(CONFIG_RTC_DRV_MSM6242) += rtc-msm6242.o
obj-$(CONFIG_RTC_DRV_MV) += rtc-mv.o
obj-$(CONFIG_RTC_DRV_NUC900) += rtc-nuc900.o
obj-$(CONFIG_RTC_DRV_OMAP) += rtc-omap.o
obj-$(CONFIG_RTC_DRV_PCAP) += rtc-pcap.o
obj-$(CONFIG_RTC_DRV_PCF8563) += rtc-pcf8563.o
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342 changes: 342 additions & 0 deletions drivers/rtc/rtc-nuc900.c
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@@ -0,0 +1,342 @@
/*
* 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 fail1;
}

nuc900_rtc->rtc_reg = ioremap(res->start, resource_size(res));
if (!nuc900_rtc->rtc_reg) {
dev_err(&pdev->dev, "ioremap rtc_reg failed\n");
err = -ENOMEM;
goto fail2;
}

nuc900_rtc->irq_num = platform_get_irq(pdev, 0);
if (request_irq(nuc900_rtc->irq_num, nuc900_rtc_interrupt,
IRQF_DISABLED, "nuc900rtc", nuc900_rtc)) {
dev_err(&pdev->dev, "NUC900 RTC request irq failed\n");
err = -EBUSY;
goto fail3;
}

nuc900_rtc->rtcdev = rtc_device_register(pdev->name, &pdev->dev,
&nuc900_rtc_ops, THIS_MODULE);
if (IS_ERR(nuc900_rtc->rtcdev)) {
dev_err(&pdev->dev, "rtc device register faild\n");
err = PTR_ERR(nuc900_rtc->rtcdev);
goto fail4;
}

platform_set_drvdata(pdev, nuc900_rtc);
__raw_writel(__raw_readl(nuc900_rtc->rtc_reg + REG_RTC_TSSR) | MODE24,
nuc900_rtc->rtc_reg + REG_RTC_TSSR);

return 0;

fail4: free_irq(nuc900_rtc->irq_num, nuc900_rtc);
fail3: iounmap(nuc900_rtc->rtc_reg);
fail2: release_mem_region(res->start, resource_size(res));
fail1: kfree(nuc900_rtc);
return err;
}

static int __devexit nuc900_rtc_remove(struct platform_device *pdev)
{
struct nuc900_rtc *nuc900_rtc = platform_get_drvdata(pdev);
struct resource *res;

rtc_device_unregister(nuc900_rtc->rtcdev);
free_irq(nuc900_rtc->irq_num, nuc900_rtc);
iounmap(nuc900_rtc->rtc_reg);

res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
release_mem_region(res->start, resource_size(res));

kfree(nuc900_rtc);

platform_set_drvdata(pdev, NULL);

return 0;
}

static struct platform_driver nuc900_rtc_driver = {
.remove = __devexit_p(nuc900_rtc_remove),
.driver = {
.name = "nuc900-rtc",
.owner = THIS_MODULE,
},
};

static int __init nuc900_rtc_init(void)
{
return platform_driver_probe(&nuc900_rtc_driver, nuc900_rtc_probe);
}

static void __exit nuc900_rtc_exit(void)
{
platform_driver_unregister(&nuc900_rtc_driver);
}

module_init(nuc900_rtc_init);
module_exit(nuc900_rtc_exit);

MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
MODULE_DESCRIPTION("nuc910/nuc920 RTC driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:nuc900-rtc");

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