mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-30 12:26:41 +07:00
426d31071a
Signed-off-by: Paul Bolle <pebolle@tiscali.nl> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
344 lines
8.3 KiB
C
344 lines
8.3 KiB
C
/*
|
|
* 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/slab.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 failed\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");
|