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/*
* Freescale STMP37XX/STMP378X Real Time Clock driver
*
* Copyright (c) 2007 Sigmatel, Inc.
* Peter Hartley, <peter.hartley@sigmatel.com>
*
* Copyright 2008-2009 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/module.h>
#include <linux/fs.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/rtc.h>
#include <linux/bcd.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/uaccess.h>
#include <mach/stmp3xxx.h>
#include <mach/hardware.h>
#include <mach/platform.h>
#include <mach/irqs.h>
#include <mach/regs-rtc.h>
struct stmp3xxx_rtc_data {
struct rtc_device *rtc;
unsigned irq_count;
};
/* Time read/write */
static int stmp3xxx_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
{
while (__raw_readl(REGS_RTC_BASE + HW_RTC_STAT) & BF(0x80, RTC_STAT_STALE_REGS))
cpu_relax();
rtc_time_to_tm(__raw_readl(REGS_RTC_BASE + HW_RTC_SECONDS), rtc_tm);
return 0;
}
static int stmp3xxx_rtc_settime(struct device *dev, struct rtc_time *rtc_tm)
{
unsigned long t;
int rc = rtc_tm_to_time(rtc_tm, &t);
if (rc == 0) {
__raw_writel(t, REGS_RTC_BASE + HW_RTC_SECONDS);
/* 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(REGS_RTC_BASE + HW_RTC_STAT) & BF(0x80, RTC_STAT_NEW_REGS))
cpu_relax();
}
return rc;
}
static irqreturn_t stmp3xxx_rtc_interrupt(int irq, void *dev_id)
{
struct platform_device *pdev = to_platform_device(dev_id);
struct stmp3xxx_rtc_data *data = platform_get_drvdata(pdev);
u32 status;
u32 events = 0;
status = __raw_readl(REGS_RTC_BASE + HW_RTC_CTRL) &
(BM_RTC_CTRL_ALARM_IRQ | BM_RTC_CTRL_ONEMSEC_IRQ);
if (status & BM_RTC_CTRL_ALARM_IRQ) {
__raw_writel(BM_RTC_CTRL_ALARM_IRQ,
REGS_RTC_BASE + HW_RTC_CTRL_CLR);
events |= RTC_AF | RTC_IRQF;
}
if (status & BM_RTC_CTRL_ONEMSEC_IRQ) {
__raw_writel(BM_RTC_CTRL_ONEMSEC_IRQ,
REGS_RTC_BASE + HW_RTC_CTRL_CLR);
if (++data->irq_count % 1000 == 0) {
events |= RTC_UF | RTC_IRQF;
data->irq_count = 0;
}
}
if (events)
rtc_update_irq(data->rtc, 1, events);
return IRQ_HANDLED;
}
static int stmp3xxx_rtc_open(struct device *dev)
{
int r;
r = request_irq(IRQ_RTC_ALARM, stmp3xxx_rtc_interrupt,
IRQF_DISABLED, "RTC alarm", dev);
if (r) {
dev_err(dev, "Cannot claim IRQ%d\n", IRQ_RTC_ALARM);
goto fail_1;
}
r = request_irq(IRQ_RTC_1MSEC, stmp3xxx_rtc_interrupt,
IRQF_DISABLED, "RTC tick", dev);
if (r) {
dev_err(dev, "Cannot claim IRQ%d\n", IRQ_RTC_1MSEC);
goto fail_2;
}
return 0;
fail_2:
free_irq(IRQ_RTC_ALARM, dev);
fail_1:
return r;
}
static void stmp3xxx_rtc_release(struct device *dev)
{
__raw_writel(BM_RTC_CTRL_ALARM_IRQ_EN | BM_RTC_CTRL_ONEMSEC_IRQ_EN,
REGS_RTC_BASE + HW_RTC_CTRL_CLR);
free_irq(IRQ_RTC_ALARM, dev);
free_irq(IRQ_RTC_1MSEC, dev);
}
static int stmp3xxx_rtc_ioctl(struct device *dev, unsigned int cmd,
unsigned long arg)
{
struct stmp3xxx_rtc_data *data = dev_get_drvdata(dev);
switch (cmd) {
case RTC_AIE_OFF:
__raw_writel(BM_RTC_PERSISTENT0_ALARM_EN |
BM_RTC_PERSISTENT0_ALARM_WAKE_EN,
REGS_RTC_BASE + HW_RTC_PERSISTENT0_CLR);
__raw_writel(BM_RTC_CTRL_ALARM_IRQ_EN,
REGS_RTC_BASE + HW_RTC_CTRL_CLR);
break;
case RTC_AIE_ON:
__raw_writel(BM_RTC_PERSISTENT0_ALARM_EN |
BM_RTC_PERSISTENT0_ALARM_WAKE_EN,
REGS_RTC_BASE + HW_RTC_PERSISTENT0_SET);
__raw_writel(BM_RTC_CTRL_ALARM_IRQ_EN,
REGS_RTC_BASE + HW_RTC_CTRL_SET);
break;
case RTC_UIE_ON:
data->irq_count = 0;
__raw_writel(BM_RTC_CTRL_ONEMSEC_IRQ_EN,
REGS_RTC_BASE + HW_RTC_CTRL_SET);
break;
case RTC_UIE_OFF:
__raw_writel(BM_RTC_CTRL_ONEMSEC_IRQ_EN,
REGS_RTC_BASE + HW_RTC_CTRL_CLR);
break;
default:
return -ENOIOCTLCMD;
}
return 0;
}
static int stmp3xxx_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
{
u32 t = __raw_readl(REGS_RTC_BASE + HW_RTC_ALARM);
rtc_time_to_tm(t, &alm->time);
return 0;
}
static int stmp3xxx_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
{
unsigned long t;
rtc_tm_to_time(&alm->time, &t);
__raw_writel(t, REGS_RTC_BASE + HW_RTC_ALARM);
return 0;
}
static struct rtc_class_ops stmp3xxx_rtc_ops = {
.open = stmp3xxx_rtc_open,
.release = stmp3xxx_rtc_release,
.ioctl = stmp3xxx_rtc_ioctl,
.read_time = stmp3xxx_rtc_gettime,
.set_time = stmp3xxx_rtc_settime,
.read_alarm = stmp3xxx_rtc_read_alarm,
.set_alarm = stmp3xxx_rtc_set_alarm,
};
static int stmp3xxx_rtc_remove(struct platform_device *dev)
{
struct stmp3xxx_rtc_data *rtc_data = platform_get_drvdata(dev);
if (rtc_data) {
rtc_device_unregister(rtc_data->rtc);
kfree(rtc_data);
}
return 0;
}
static int stmp3xxx_rtc_probe(struct platform_device *pdev)
{
u32 hwversion = __raw_readl(REGS_RTC_BASE + HW_RTC_VERSION);
u32 rtc_stat = __raw_readl(REGS_RTC_BASE + HW_RTC_STAT);
struct stmp3xxx_rtc_data *rtc_data = kzalloc(sizeof *rtc_data,
GFP_KERNEL);
if ((rtc_stat & BM_RTC_STAT_RTC_PRESENT) == 0)
return -ENODEV;
if (!rtc_data)
return -ENOMEM;
stmp3xxx_reset_block(REGS_RTC_BASE, 1);
__raw_writel(BM_RTC_PERSISTENT0_ALARM_EN |
BM_RTC_PERSISTENT0_ALARM_WAKE_EN |
BM_RTC_PERSISTENT0_ALARM_WAKE,
REGS_RTC_BASE + HW_RTC_PERSISTENT0_CLR);
__raw_writel(BM_RTC_PERSISTENT0_AUTO_RESTART,
REGS_RTC_BASE + HW_RTC_PERSISTENT0_SET);
printk(KERN_INFO "STMP3xxx RTC driver v1.0 hardware v%u.%u.%u\n",
(hwversion >> 24),
(hwversion >> 16) & 0xFF,
hwversion & 0xFFFF);
rtc_data->rtc = rtc_device_register(pdev->name, &pdev->dev,
&stmp3xxx_rtc_ops, THIS_MODULE);
if (IS_ERR(rtc_data->rtc)) {
kfree(rtc_data);
return PTR_ERR(rtc_data->rtc);
}
platform_set_drvdata(pdev, rtc_data);
return 0;
}
#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)
{
stmp3xxx_reset_block(REGS_RTC_BASE, 1);
__raw_writel(BM_RTC_PERSISTENT0_ALARM_EN |
BM_RTC_PERSISTENT0_ALARM_WAKE_EN |
BM_RTC_PERSISTENT0_ALARM_WAKE,
REGS_RTC_BASE + HW_RTC_PERSISTENT0_CLR);
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 <dimka@embeddedalley.com>");
MODULE_LICENSE("GPL");
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