305 lines
7.6 KiB
C
305 lines
7.6 KiB
C
/*
|
|
* Freescale STMP37XX/STMP378X Real Time Clock driver
|
|
*
|
|
* Copyright (c) 2007 Sigmatel, Inc.
|
|
* Peter Hartley, <peter.hartley@sigmatel.com>
|
|
*
|
|
* Copyright 2008 Freescale Semiconductor, Inc. All Rights Reserved.
|
|
* Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved.
|
|
*/
|
|
|
|
/*
|
|
* The code contained herein is licensed under the GNU General Public
|
|
* License. You may obtain a copy of the GNU General Public License
|
|
* Version 2 or later at the following locations:
|
|
*
|
|
* http://www.opensource.org/licenses/gpl-license.html
|
|
* http://www.gnu.org/copyleft/gpl.html
|
|
*/
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/rtc.h>
|
|
|
|
#include <mach/platform.h>
|
|
#include <mach/stmp3xxx.h>
|
|
#include <mach/regs-rtc.h>
|
|
|
|
struct stmp3xxx_rtc_data {
|
|
struct rtc_device *rtc;
|
|
unsigned irq_count;
|
|
void __iomem *io;
|
|
int irq_alarm, irq_1msec;
|
|
};
|
|
|
|
static void stmp3xxx_wait_time(struct stmp3xxx_rtc_data *rtc_data)
|
|
{
|
|
/*
|
|
* The datasheet doesn't say which way round the
|
|
* NEW_REGS/STALE_REGS bitfields go. In fact it's 0x1=P0,
|
|
* 0x2=P1, .., 0x20=P5, 0x40=ALARM, 0x80=SECONDS
|
|
*/
|
|
while (__raw_readl(rtc_data->io + HW_RTC_STAT) &
|
|
BF(0x80, RTC_STAT_STALE_REGS))
|
|
cpu_relax();
|
|
}
|
|
|
|
/* Time read/write */
|
|
static int stmp3xxx_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
|
|
{
|
|
struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev);
|
|
|
|
stmp3xxx_wait_time(rtc_data);
|
|
rtc_time_to_tm(__raw_readl(rtc_data->io + HW_RTC_SECONDS), rtc_tm);
|
|
return 0;
|
|
}
|
|
|
|
static int stmp3xxx_rtc_set_mmss(struct device *dev, unsigned long t)
|
|
{
|
|
struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev);
|
|
|
|
__raw_writel(t, rtc_data->io + HW_RTC_SECONDS);
|
|
stmp3xxx_wait_time(rtc_data);
|
|
return 0;
|
|
}
|
|
|
|
/* interrupt(s) handler */
|
|
static irqreturn_t stmp3xxx_rtc_interrupt(int irq, void *dev_id)
|
|
{
|
|
struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev_id);
|
|
u32 status;
|
|
u32 events = 0;
|
|
|
|
status = __raw_readl(rtc_data->io + HW_RTC_CTRL) &
|
|
(BM_RTC_CTRL_ALARM_IRQ | BM_RTC_CTRL_ONEMSEC_IRQ);
|
|
|
|
if (status & BM_RTC_CTRL_ALARM_IRQ) {
|
|
stmp3xxx_clearl(BM_RTC_CTRL_ALARM_IRQ,
|
|
rtc_data->io + HW_RTC_CTRL);
|
|
events |= RTC_AF | RTC_IRQF;
|
|
}
|
|
|
|
if (status & BM_RTC_CTRL_ONEMSEC_IRQ) {
|
|
stmp3xxx_clearl(BM_RTC_CTRL_ONEMSEC_IRQ,
|
|
rtc_data->io + HW_RTC_CTRL);
|
|
if (++rtc_data->irq_count % 1000 == 0) {
|
|
events |= RTC_UF | RTC_IRQF;
|
|
rtc_data->irq_count = 0;
|
|
}
|
|
}
|
|
|
|
if (events)
|
|
rtc_update_irq(rtc_data->rtc, 1, events);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int stmp3xxx_alarm_irq_enable(struct device *dev, unsigned int enabled)
|
|
{
|
|
struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev);
|
|
void __iomem *p = rtc_data->io + HW_RTC_PERSISTENT0,
|
|
*ctl = rtc_data->io + HW_RTC_CTRL;
|
|
|
|
if (enabled) {
|
|
stmp3xxx_setl(BM_RTC_PERSISTENT0_ALARM_EN |
|
|
BM_RTC_PERSISTENT0_ALARM_WAKE_EN, p);
|
|
stmp3xxx_setl(BM_RTC_CTRL_ALARM_IRQ_EN, ctl);
|
|
} else {
|
|
stmp3xxx_clearl(BM_RTC_PERSISTENT0_ALARM_EN |
|
|
BM_RTC_PERSISTENT0_ALARM_WAKE_EN, p);
|
|
stmp3xxx_clearl(BM_RTC_CTRL_ALARM_IRQ_EN, ctl);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int stmp3xxx_update_irq_enable(struct device *dev, unsigned int enabled)
|
|
{
|
|
struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev);
|
|
|
|
if (enabled)
|
|
stmp3xxx_setl(BM_RTC_CTRL_ONEMSEC_IRQ_EN,
|
|
rtc_data->io + HW_RTC_CTRL);
|
|
else
|
|
stmp3xxx_clearl(BM_RTC_CTRL_ONEMSEC_IRQ_EN,
|
|
rtc_data->io + HW_RTC_CTRL);
|
|
return 0;
|
|
}
|
|
|
|
static int stmp3xxx_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
|
|
{
|
|
struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev);
|
|
|
|
rtc_time_to_tm(__raw_readl(rtc_data->io + HW_RTC_ALARM), &alm->time);
|
|
return 0;
|
|
}
|
|
|
|
static int stmp3xxx_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
|
|
{
|
|
unsigned long t;
|
|
struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev);
|
|
|
|
rtc_tm_to_time(&alm->time, &t);
|
|
__raw_writel(t, rtc_data->io + HW_RTC_ALARM);
|
|
return 0;
|
|
}
|
|
|
|
static struct rtc_class_ops stmp3xxx_rtc_ops = {
|
|
.alarm_irq_enable =
|
|
stmp3xxx_alarm_irq_enable,
|
|
.update_irq_enable =
|
|
stmp3xxx_update_irq_enable,
|
|
.read_time = stmp3xxx_rtc_gettime,
|
|
.set_mmss = stmp3xxx_rtc_set_mmss,
|
|
.read_alarm = stmp3xxx_rtc_read_alarm,
|
|
.set_alarm = stmp3xxx_rtc_set_alarm,
|
|
};
|
|
|
|
static int stmp3xxx_rtc_remove(struct platform_device *pdev)
|
|
{
|
|
struct stmp3xxx_rtc_data *rtc_data = platform_get_drvdata(pdev);
|
|
|
|
if (!rtc_data)
|
|
return 0;
|
|
|
|
stmp3xxx_clearl(BM_RTC_CTRL_ONEMSEC_IRQ_EN | BM_RTC_CTRL_ALARM_IRQ_EN,
|
|
rtc_data->io + HW_RTC_CTRL);
|
|
free_irq(rtc_data->irq_alarm, &pdev->dev);
|
|
free_irq(rtc_data->irq_1msec, &pdev->dev);
|
|
rtc_device_unregister(rtc_data->rtc);
|
|
iounmap(rtc_data->io);
|
|
kfree(rtc_data);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int stmp3xxx_rtc_probe(struct platform_device *pdev)
|
|
{
|
|
struct stmp3xxx_rtc_data *rtc_data;
|
|
struct resource *r;
|
|
int err;
|
|
|
|
rtc_data = kzalloc(sizeof *rtc_data, GFP_KERNEL);
|
|
if (!rtc_data)
|
|
return -ENOMEM;
|
|
|
|
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (!r) {
|
|
dev_err(&pdev->dev, "failed to get resource\n");
|
|
err = -ENXIO;
|
|
goto out_free;
|
|
}
|
|
|
|
rtc_data->io = ioremap(r->start, resource_size(r));
|
|
if (!rtc_data->io) {
|
|
dev_err(&pdev->dev, "ioremap failed\n");
|
|
err = -EIO;
|
|
goto out_free;
|
|
}
|
|
|
|
rtc_data->irq_alarm = platform_get_irq(pdev, 0);
|
|
rtc_data->irq_1msec = platform_get_irq(pdev, 1);
|
|
|
|
if (!(__raw_readl(HW_RTC_STAT + rtc_data->io) &
|
|
BM_RTC_STAT_RTC_PRESENT)) {
|
|
dev_err(&pdev->dev, "no device onboard\n");
|
|
err = -ENODEV;
|
|
goto out_remap;
|
|
}
|
|
|
|
stmp3xxx_reset_block(rtc_data->io, true);
|
|
stmp3xxx_clearl(BM_RTC_PERSISTENT0_ALARM_EN |
|
|
BM_RTC_PERSISTENT0_ALARM_WAKE_EN |
|
|
BM_RTC_PERSISTENT0_ALARM_WAKE,
|
|
rtc_data->io + HW_RTC_PERSISTENT0);
|
|
rtc_data->rtc = rtc_device_register(pdev->name, &pdev->dev,
|
|
&stmp3xxx_rtc_ops, THIS_MODULE);
|
|
if (IS_ERR(rtc_data->rtc)) {
|
|
err = PTR_ERR(rtc_data->rtc);
|
|
goto out_remap;
|
|
}
|
|
|
|
rtc_data->irq_count = 0;
|
|
err = request_irq(rtc_data->irq_alarm, stmp3xxx_rtc_interrupt,
|
|
IRQF_DISABLED, "RTC alarm", &pdev->dev);
|
|
if (err) {
|
|
dev_err(&pdev->dev, "Cannot claim IRQ%d\n",
|
|
rtc_data->irq_alarm);
|
|
goto out_irq_alarm;
|
|
}
|
|
err = request_irq(rtc_data->irq_1msec, stmp3xxx_rtc_interrupt,
|
|
IRQF_DISABLED, "RTC tick", &pdev->dev);
|
|
if (err) {
|
|
dev_err(&pdev->dev, "Cannot claim IRQ%d\n",
|
|
rtc_data->irq_1msec);
|
|
goto out_irq1;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, rtc_data);
|
|
|
|
return 0;
|
|
|
|
out_irq1:
|
|
free_irq(rtc_data->irq_alarm, &pdev->dev);
|
|
out_irq_alarm:
|
|
stmp3xxx_clearl(BM_RTC_CTRL_ONEMSEC_IRQ_EN | BM_RTC_CTRL_ALARM_IRQ_EN,
|
|
rtc_data->io + HW_RTC_CTRL);
|
|
rtc_device_unregister(rtc_data->rtc);
|
|
out_remap:
|
|
iounmap(rtc_data->io);
|
|
out_free:
|
|
kfree(rtc_data);
|
|
return err;
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
static int stmp3xxx_rtc_suspend(struct platform_device *dev, pm_message_t state)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int stmp3xxx_rtc_resume(struct platform_device *dev)
|
|
{
|
|
struct stmp3xxx_rtc_data *rtc_data = platform_get_drvdata(dev);
|
|
|
|
stmp3xxx_reset_block(rtc_data->io, true);
|
|
stmp3xxx_clearl(BM_RTC_PERSISTENT0_ALARM_EN |
|
|
BM_RTC_PERSISTENT0_ALARM_WAKE_EN |
|
|
BM_RTC_PERSISTENT0_ALARM_WAKE,
|
|
rtc_data->io + HW_RTC_PERSISTENT0);
|
|
return 0;
|
|
}
|
|
#else
|
|
#define stmp3xxx_rtc_suspend NULL
|
|
#define stmp3xxx_rtc_resume NULL
|
|
#endif
|
|
|
|
static struct platform_driver stmp3xxx_rtcdrv = {
|
|
.probe = stmp3xxx_rtc_probe,
|
|
.remove = stmp3xxx_rtc_remove,
|
|
.suspend = stmp3xxx_rtc_suspend,
|
|
.resume = stmp3xxx_rtc_resume,
|
|
.driver = {
|
|
.name = "stmp3xxx-rtc",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
static int __init stmp3xxx_rtc_init(void)
|
|
{
|
|
return platform_driver_register(&stmp3xxx_rtcdrv);
|
|
}
|
|
|
|
static void __exit stmp3xxx_rtc_exit(void)
|
|
{
|
|
platform_driver_unregister(&stmp3xxx_rtcdrv);
|
|
}
|
|
|
|
module_init(stmp3xxx_rtc_init);
|
|
module_exit(stmp3xxx_rtc_exit);
|
|
|
|
MODULE_DESCRIPTION("STMP3xxx RTC Driver");
|
|
MODULE_AUTHOR("dmitry pervushin <dpervushin@embeddedalley.com>");
|
|
MODULE_LICENSE("GPL");
|