mirror of
https://github.com/adulau/aha.git
synced 2024-12-27 19:26:25 +00:00
rtc: add Freescale stmp37xx/378x driver
Add support for RTC on the Freescale STMP37xx/378x platform. Signed-off-by: dmitry pervushin <dpervushin@embeddedalley.com> Signed-off-by: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
dmitry pervushin
Linus Torvalds
parent
6bff5fb80b
commit
df17f63173
3 changed files with 315 additions and 0 deletions
|
|
@ -810,4 +810,14 @@ config RTC_DRV_COH901331
|
|||
will be called "rtc-coh901331".
|
||||
|
||||
|
||||
config RTC_DRV_STMP
|
||||
tristate "Freescale STMP3xxx RTC"
|
||||
depends on ARCH_STMP3XXX
|
||||
help
|
||||
If you say yes here you will get support for the onboard
|
||||
STMP3xxx RTC.
|
||||
|
||||
This driver can also be built as a module. If so, the module
|
||||
will be called rtc-stmp3xxx.
|
||||
|
||||
endif # RTC_CLASS
|
||||
|
|
|
|||
|
|
@ -83,3 +83,4 @@ obj-$(CONFIG_RTC_DRV_X1205) += rtc-x1205.o
|
|||
obj-$(CONFIG_RTC_DRV_PCF50633) += rtc-pcf50633.o
|
||||
obj-$(CONFIG_RTC_DRV_PS3) += rtc-ps3.o
|
||||
obj-$(CONFIG_RTC_DRV_COH901331) += rtc-coh901331.o
|
||||
obj-$(CONFIG_RTC_DRV_STMP) += rtc-stmp3xxx.o
|
||||
|
|
|
|||
304
drivers/rtc/rtc-stmp3xxx.c
Normal file
304
drivers/rtc/rtc-stmp3xxx.c
Normal file
|
|
@ -0,0 +1,304 @@
|
|||
/*
|
||||
* 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");
|
||||
Loading…
Reference in a new issue