mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-15 08:44:14 +08:00
2113852b23
The module.h was implicitly everywhere, but when we clean that up, the implicit users will compile fail; fix them up in advance. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
322 lines
8.5 KiB
C
322 lines
8.5 KiB
C
/*
|
|
* Driver for the RTC in Marvell SoCs.
|
|
*
|
|
* This file is licensed under the terms of the GNU General Public
|
|
* License version 2. This program is licensed "as is" without any
|
|
* warranty of any kind, whether express or implied.
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/rtc.h>
|
|
#include <linux/bcd.h>
|
|
#include <linux/io.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/gfp.h>
|
|
#include <linux/module.h>
|
|
|
|
|
|
#define RTC_TIME_REG_OFFS 0
|
|
#define RTC_SECONDS_OFFS 0
|
|
#define RTC_MINUTES_OFFS 8
|
|
#define RTC_HOURS_OFFS 16
|
|
#define RTC_WDAY_OFFS 24
|
|
#define RTC_HOURS_12H_MODE (1 << 22) /* 12 hours mode */
|
|
|
|
#define RTC_DATE_REG_OFFS 4
|
|
#define RTC_MDAY_OFFS 0
|
|
#define RTC_MONTH_OFFS 8
|
|
#define RTC_YEAR_OFFS 16
|
|
|
|
#define RTC_ALARM_TIME_REG_OFFS 8
|
|
#define RTC_ALARM_DATE_REG_OFFS 0xc
|
|
#define RTC_ALARM_VALID (1 << 7)
|
|
|
|
#define RTC_ALARM_INTERRUPT_MASK_REG_OFFS 0x10
|
|
#define RTC_ALARM_INTERRUPT_CASUE_REG_OFFS 0x14
|
|
|
|
struct rtc_plat_data {
|
|
struct rtc_device *rtc;
|
|
void __iomem *ioaddr;
|
|
int irq;
|
|
};
|
|
|
|
static int mv_rtc_set_time(struct device *dev, struct rtc_time *tm)
|
|
{
|
|
struct rtc_plat_data *pdata = dev_get_drvdata(dev);
|
|
void __iomem *ioaddr = pdata->ioaddr;
|
|
u32 rtc_reg;
|
|
|
|
rtc_reg = (bin2bcd(tm->tm_sec) << RTC_SECONDS_OFFS) |
|
|
(bin2bcd(tm->tm_min) << RTC_MINUTES_OFFS) |
|
|
(bin2bcd(tm->tm_hour) << RTC_HOURS_OFFS) |
|
|
(bin2bcd(tm->tm_wday) << RTC_WDAY_OFFS);
|
|
writel(rtc_reg, ioaddr + RTC_TIME_REG_OFFS);
|
|
|
|
rtc_reg = (bin2bcd(tm->tm_mday) << RTC_MDAY_OFFS) |
|
|
(bin2bcd(tm->tm_mon + 1) << RTC_MONTH_OFFS) |
|
|
(bin2bcd(tm->tm_year % 100) << RTC_YEAR_OFFS);
|
|
writel(rtc_reg, ioaddr + RTC_DATE_REG_OFFS);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mv_rtc_read_time(struct device *dev, struct rtc_time *tm)
|
|
{
|
|
struct rtc_plat_data *pdata = dev_get_drvdata(dev);
|
|
void __iomem *ioaddr = pdata->ioaddr;
|
|
u32 rtc_time, rtc_date;
|
|
unsigned int year, month, day, hour, minute, second, wday;
|
|
|
|
rtc_time = readl(ioaddr + RTC_TIME_REG_OFFS);
|
|
rtc_date = readl(ioaddr + RTC_DATE_REG_OFFS);
|
|
|
|
second = rtc_time & 0x7f;
|
|
minute = (rtc_time >> RTC_MINUTES_OFFS) & 0x7f;
|
|
hour = (rtc_time >> RTC_HOURS_OFFS) & 0x3f; /* assume 24 hours mode */
|
|
wday = (rtc_time >> RTC_WDAY_OFFS) & 0x7;
|
|
|
|
day = rtc_date & 0x3f;
|
|
month = (rtc_date >> RTC_MONTH_OFFS) & 0x3f;
|
|
year = (rtc_date >> RTC_YEAR_OFFS) & 0xff;
|
|
|
|
tm->tm_sec = bcd2bin(second);
|
|
tm->tm_min = bcd2bin(minute);
|
|
tm->tm_hour = bcd2bin(hour);
|
|
tm->tm_mday = bcd2bin(day);
|
|
tm->tm_wday = bcd2bin(wday);
|
|
tm->tm_mon = bcd2bin(month) - 1;
|
|
/* hw counts from year 2000, but tm_year is relative to 1900 */
|
|
tm->tm_year = bcd2bin(year) + 100;
|
|
|
|
return rtc_valid_tm(tm);
|
|
}
|
|
|
|
static int mv_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
|
|
{
|
|
struct rtc_plat_data *pdata = dev_get_drvdata(dev);
|
|
void __iomem *ioaddr = pdata->ioaddr;
|
|
u32 rtc_time, rtc_date;
|
|
unsigned int year, month, day, hour, minute, second, wday;
|
|
|
|
rtc_time = readl(ioaddr + RTC_ALARM_TIME_REG_OFFS);
|
|
rtc_date = readl(ioaddr + RTC_ALARM_DATE_REG_OFFS);
|
|
|
|
second = rtc_time & 0x7f;
|
|
minute = (rtc_time >> RTC_MINUTES_OFFS) & 0x7f;
|
|
hour = (rtc_time >> RTC_HOURS_OFFS) & 0x3f; /* assume 24 hours mode */
|
|
wday = (rtc_time >> RTC_WDAY_OFFS) & 0x7;
|
|
|
|
day = rtc_date & 0x3f;
|
|
month = (rtc_date >> RTC_MONTH_OFFS) & 0x3f;
|
|
year = (rtc_date >> RTC_YEAR_OFFS) & 0xff;
|
|
|
|
alm->time.tm_sec = bcd2bin(second);
|
|
alm->time.tm_min = bcd2bin(minute);
|
|
alm->time.tm_hour = bcd2bin(hour);
|
|
alm->time.tm_mday = bcd2bin(day);
|
|
alm->time.tm_wday = bcd2bin(wday);
|
|
alm->time.tm_mon = bcd2bin(month) - 1;
|
|
/* hw counts from year 2000, but tm_year is relative to 1900 */
|
|
alm->time.tm_year = bcd2bin(year) + 100;
|
|
|
|
if (rtc_valid_tm(&alm->time) < 0) {
|
|
dev_err(dev, "retrieved alarm date/time is not valid.\n");
|
|
rtc_time_to_tm(0, &alm->time);
|
|
}
|
|
|
|
alm->enabled = !!readl(ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
|
|
return 0;
|
|
}
|
|
|
|
static int mv_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
|
|
{
|
|
struct rtc_plat_data *pdata = dev_get_drvdata(dev);
|
|
void __iomem *ioaddr = pdata->ioaddr;
|
|
u32 rtc_reg = 0;
|
|
|
|
if (alm->time.tm_sec >= 0)
|
|
rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_sec))
|
|
<< RTC_SECONDS_OFFS;
|
|
if (alm->time.tm_min >= 0)
|
|
rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_min))
|
|
<< RTC_MINUTES_OFFS;
|
|
if (alm->time.tm_hour >= 0)
|
|
rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_hour))
|
|
<< RTC_HOURS_OFFS;
|
|
|
|
writel(rtc_reg, ioaddr + RTC_ALARM_TIME_REG_OFFS);
|
|
|
|
if (alm->time.tm_mday >= 0)
|
|
rtc_reg = (RTC_ALARM_VALID | bin2bcd(alm->time.tm_mday))
|
|
<< RTC_MDAY_OFFS;
|
|
else
|
|
rtc_reg = 0;
|
|
|
|
if (alm->time.tm_mon >= 0)
|
|
rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_mon + 1))
|
|
<< RTC_MONTH_OFFS;
|
|
|
|
if (alm->time.tm_year >= 0)
|
|
rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_year % 100))
|
|
<< RTC_YEAR_OFFS;
|
|
|
|
writel(rtc_reg, ioaddr + RTC_ALARM_DATE_REG_OFFS);
|
|
writel(0, ioaddr + RTC_ALARM_INTERRUPT_CASUE_REG_OFFS);
|
|
writel(alm->enabled ? 1 : 0,
|
|
ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mv_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
|
|
void __iomem *ioaddr = pdata->ioaddr;
|
|
|
|
if (pdata->irq < 0)
|
|
return -EINVAL; /* fall back into rtc-dev's emulation */
|
|
|
|
if (enabled)
|
|
writel(1, ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
|
|
else
|
|
writel(0, ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
|
|
return 0;
|
|
}
|
|
|
|
static irqreturn_t mv_rtc_interrupt(int irq, void *data)
|
|
{
|
|
struct rtc_plat_data *pdata = data;
|
|
void __iomem *ioaddr = pdata->ioaddr;
|
|
|
|
/* alarm irq? */
|
|
if (!readl(ioaddr + RTC_ALARM_INTERRUPT_CASUE_REG_OFFS))
|
|
return IRQ_NONE;
|
|
|
|
/* clear interrupt */
|
|
writel(0, ioaddr + RTC_ALARM_INTERRUPT_CASUE_REG_OFFS);
|
|
rtc_update_irq(pdata->rtc, 1, RTC_IRQF | RTC_AF);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static const struct rtc_class_ops mv_rtc_ops = {
|
|
.read_time = mv_rtc_read_time,
|
|
.set_time = mv_rtc_set_time,
|
|
};
|
|
|
|
static const struct rtc_class_ops mv_rtc_alarm_ops = {
|
|
.read_time = mv_rtc_read_time,
|
|
.set_time = mv_rtc_set_time,
|
|
.read_alarm = mv_rtc_read_alarm,
|
|
.set_alarm = mv_rtc_set_alarm,
|
|
.alarm_irq_enable = mv_rtc_alarm_irq_enable,
|
|
};
|
|
|
|
static int __devinit mv_rtc_probe(struct platform_device *pdev)
|
|
{
|
|
struct resource *res;
|
|
struct rtc_plat_data *pdata;
|
|
resource_size_t size;
|
|
u32 rtc_time;
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (!res)
|
|
return -ENODEV;
|
|
|
|
pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
|
|
if (!pdata)
|
|
return -ENOMEM;
|
|
|
|
size = resource_size(res);
|
|
if (!devm_request_mem_region(&pdev->dev, res->start, size,
|
|
pdev->name))
|
|
return -EBUSY;
|
|
|
|
pdata->ioaddr = devm_ioremap(&pdev->dev, res->start, size);
|
|
if (!pdata->ioaddr)
|
|
return -ENOMEM;
|
|
|
|
/* make sure the 24 hours mode is enabled */
|
|
rtc_time = readl(pdata->ioaddr + RTC_TIME_REG_OFFS);
|
|
if (rtc_time & RTC_HOURS_12H_MODE) {
|
|
dev_err(&pdev->dev, "24 Hours mode not supported.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* make sure it is actually functional */
|
|
if (rtc_time == 0x01000000) {
|
|
ssleep(1);
|
|
rtc_time = readl(pdata->ioaddr + RTC_TIME_REG_OFFS);
|
|
if (rtc_time == 0x01000000) {
|
|
dev_err(&pdev->dev, "internal RTC not ticking\n");
|
|
return -ENODEV;
|
|
}
|
|
}
|
|
|
|
pdata->irq = platform_get_irq(pdev, 0);
|
|
|
|
platform_set_drvdata(pdev, pdata);
|
|
|
|
if (pdata->irq >= 0) {
|
|
device_init_wakeup(&pdev->dev, 1);
|
|
pdata->rtc = rtc_device_register(pdev->name, &pdev->dev,
|
|
&mv_rtc_alarm_ops,
|
|
THIS_MODULE);
|
|
} else
|
|
pdata->rtc = rtc_device_register(pdev->name, &pdev->dev,
|
|
&mv_rtc_ops, THIS_MODULE);
|
|
if (IS_ERR(pdata->rtc))
|
|
return PTR_ERR(pdata->rtc);
|
|
|
|
if (pdata->irq >= 0) {
|
|
writel(0, pdata->ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
|
|
if (devm_request_irq(&pdev->dev, pdata->irq, mv_rtc_interrupt,
|
|
IRQF_DISABLED | IRQF_SHARED,
|
|
pdev->name, pdata) < 0) {
|
|
dev_warn(&pdev->dev, "interrupt not available.\n");
|
|
pdata->irq = -1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __exit mv_rtc_remove(struct platform_device *pdev)
|
|
{
|
|
struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
|
|
|
|
if (pdata->irq >= 0)
|
|
device_init_wakeup(&pdev->dev, 0);
|
|
|
|
rtc_device_unregister(pdata->rtc);
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver mv_rtc_driver = {
|
|
.remove = __exit_p(mv_rtc_remove),
|
|
.driver = {
|
|
.name = "rtc-mv",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
static __init int mv_init(void)
|
|
{
|
|
return platform_driver_probe(&mv_rtc_driver, mv_rtc_probe);
|
|
}
|
|
|
|
static __exit void mv_exit(void)
|
|
{
|
|
platform_driver_unregister(&mv_rtc_driver);
|
|
}
|
|
|
|
module_init(mv_init);
|
|
module_exit(mv_exit);
|
|
|
|
MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>");
|
|
MODULE_DESCRIPTION("Marvell RTC driver");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:rtc-mv");
|