mirror of
https://github.com/torvalds/linux.git
synced 2024-11-27 22:51:35 +00:00
ARM: NUC900: add RTC driver support for nuc910 and nuc920
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>
This commit is contained in:
Wan ZongShun
Linus Torvalds
parent
d973b632a3
commit
afd49a7e92
@ -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"
|
||||
|
||||
|
||||
@ -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
|
||||
|
||||
342
drivers/rtc/rtc-nuc900.c
Normal file
342
drivers/rtc/rtc-nuc900.c
Normal file
@ -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");
|
||||
Loading…
Reference in New Issue
Block a user