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/*
* linux/arch/arm/mach-integrator/time.c
*
* Copyright (C) 2000-2001 Deep Blue Solutions Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/time.h>
#include <linux/mc146818rtc.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/amba/bus.h>
#include <asm/hardware.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/rtc.h>
#include <asm/mach/time.h>
#define RTC_DR (0)
#define RTC_MR (4)
#define RTC_STAT (8)
#define RTC_EOI (8)
#define RTC_LR (12)
#define RTC_CR (16)
#define RTC_CR_MIE (1 << 0)
extern int (*set_rtc)(void);
static void __iomem *rtc_base;
static int integrator_set_rtc(void)
{
__raw_writel(xtime.tv_sec, rtc_base + RTC_LR);
return 1;
}
static int integrator_rtc_read_alarm(struct rtc_wkalrm *alrm)
{
rtc_time_to_tm(readl(rtc_base + RTC_MR), &alrm->time);
return 0;
}
static inline int integrator_rtc_set_alarm(struct rtc_wkalrm *alrm)
{
unsigned long time;
int ret;
/*
* At the moment, we can only deal with non-wildcarded alarm times.
*/
ret = rtc_valid_tm(&alrm->time);
if (ret == 0)
ret = rtc_tm_to_time(&alrm->time, &time);
if (ret == 0)
writel(time, rtc_base + RTC_MR);
return ret;
}
static int integrator_rtc_read_time(struct rtc_time *tm)
{
rtc_time_to_tm(readl(rtc_base + RTC_DR), tm);
return 0;
}
/*
* Set the RTC time. Unfortunately, we can't accurately set
* the point at which the counter updates.
*
* Also, since RTC_LR is transferred to RTC_CR on next rising
* edge of the 1Hz clock, we must write the time one second
* in advance.
*/
static inline int integrator_rtc_set_time(struct rtc_time *tm)
{
unsigned long time;
int ret;
ret = rtc_tm_to_time(tm, &time);
if (ret == 0)
writel(time + 1, rtc_base + RTC_LR);
return ret;
}
static struct rtc_ops rtc_ops = {
.owner = THIS_MODULE,
.read_time = integrator_rtc_read_time,
.set_time = integrator_rtc_set_time,
.read_alarm = integrator_rtc_read_alarm,
.set_alarm = integrator_rtc_set_alarm,
};
static irqreturn_t arm_rtc_interrupt(int irq, void *dev_id)
{
writel(0, rtc_base + RTC_EOI);
return IRQ_HANDLED;
}
static int rtc_probe(struct amba_device *dev, void *id)
{
int ret;
if (rtc_base)
return -EBUSY;
ret = amba_request_regions(dev, NULL);
if (ret)
goto out;
rtc_base = ioremap(dev->res.start, SZ_4K);
if (!rtc_base) {
ret = -ENOMEM;
goto res_out;
}
__raw_writel(0, rtc_base + RTC_CR);
__raw_writel(0, rtc_base + RTC_EOI);
xtime.tv_sec = __raw_readl(rtc_base + RTC_DR);
/* note that 'dev' is merely used for irq disambiguation;
* it is not actually referenced in the irq handler
*/
ret = request_irq(dev->irq[0], arm_rtc_interrupt, IRQF_DISABLED,
"rtc-pl030", dev);
if (ret)
goto map_out;
ret = register_rtc(&rtc_ops);
if (ret)
goto irq_out;
set_rtc = integrator_set_rtc;
return 0;
irq_out:
free_irq(dev->irq[0], dev);
map_out:
iounmap(rtc_base);
rtc_base = NULL;
res_out:
amba_release_regions(dev);
out:
return ret;
}
static int rtc_remove(struct amba_device *dev)
{
set_rtc = NULL;
writel(0, rtc_base + RTC_CR);
free_irq(dev->irq[0], dev);
unregister_rtc(&rtc_ops);
iounmap(rtc_base);
rtc_base = NULL;
amba_release_regions(dev);
return 0;
}
static struct timespec rtc_delta;
static int rtc_suspend(struct amba_device *dev, pm_message_t state)
{
struct timespec rtc;
rtc.tv_sec = readl(rtc_base + RTC_DR);
rtc.tv_nsec = 0;
save_time_delta(&rtc_delta, &rtc);
return 0;
}
static int rtc_resume(struct amba_device *dev)
{
struct timespec rtc;
rtc.tv_sec = readl(rtc_base + RTC_DR);
rtc.tv_nsec = 0;
restore_time_delta(&rtc_delta, &rtc);
return 0;
}
static struct amba_id rtc_ids[] = {
{
.id = 0x00041030,
.mask = 0x000fffff,
},
{ 0, 0 },
};
static struct amba_driver rtc_driver = {
.drv = {
.name = "rtc-pl030",
},
.probe = rtc_probe,
.remove = rtc_remove,
.suspend = rtc_suspend,
.resume = rtc_resume,
.id_table = rtc_ids,
};
static int __init integrator_rtc_init(void)
{
return amba_driver_register(&rtc_driver);
}
static void __exit integrator_rtc_exit(void)
{
amba_driver_unregister(&rtc_driver);
}
module_init(integrator_rtc_init);
module_exit(integrator_rtc_exit);
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