391 lines
9.2 KiB
C
391 lines
9.2 KiB
C
/*
|
|
* Real-time clock driver for MPC5121
|
|
*
|
|
* Copyright 2007, Domen Puncer <domen.puncer@telargo.com>
|
|
* Copyright 2008, Freescale Semiconductor, Inc. All rights reserved.
|
|
*
|
|
* 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/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/rtc.h>
|
|
#include <linux/of_device.h>
|
|
#include <linux/of_platform.h>
|
|
#include <linux/io.h>
|
|
#include <linux/slab.h>
|
|
|
|
struct mpc5121_rtc_regs {
|
|
u8 set_time; /* RTC + 0x00 */
|
|
u8 hour_set; /* RTC + 0x01 */
|
|
u8 minute_set; /* RTC + 0x02 */
|
|
u8 second_set; /* RTC + 0x03 */
|
|
|
|
u8 set_date; /* RTC + 0x04 */
|
|
u8 month_set; /* RTC + 0x05 */
|
|
u8 weekday_set; /* RTC + 0x06 */
|
|
u8 date_set; /* RTC + 0x07 */
|
|
|
|
u8 write_sw; /* RTC + 0x08 */
|
|
u8 sw_set; /* RTC + 0x09 */
|
|
u16 year_set; /* RTC + 0x0a */
|
|
|
|
u8 alm_enable; /* RTC + 0x0c */
|
|
u8 alm_hour_set; /* RTC + 0x0d */
|
|
u8 alm_min_set; /* RTC + 0x0e */
|
|
u8 int_enable; /* RTC + 0x0f */
|
|
|
|
u8 reserved1;
|
|
u8 hour; /* RTC + 0x11 */
|
|
u8 minute; /* RTC + 0x12 */
|
|
u8 second; /* RTC + 0x13 */
|
|
|
|
u8 month; /* RTC + 0x14 */
|
|
u8 wday_mday; /* RTC + 0x15 */
|
|
u16 year; /* RTC + 0x16 */
|
|
|
|
u8 int_alm; /* RTC + 0x18 */
|
|
u8 int_sw; /* RTC + 0x19 */
|
|
u8 alm_status; /* RTC + 0x1a */
|
|
u8 sw_minute; /* RTC + 0x1b */
|
|
|
|
u8 bus_error_1; /* RTC + 0x1c */
|
|
u8 int_day; /* RTC + 0x1d */
|
|
u8 int_min; /* RTC + 0x1e */
|
|
u8 int_sec; /* RTC + 0x1f */
|
|
|
|
/*
|
|
* target_time:
|
|
* intended to be used for hibernation but hibernation
|
|
* does not work on silicon rev 1.5 so use it for non-volatile
|
|
* storage of offset between the actual_time register and linux
|
|
* time
|
|
*/
|
|
u32 target_time; /* RTC + 0x20 */
|
|
/*
|
|
* actual_time:
|
|
* readonly time since VBAT_RTC was last connected
|
|
*/
|
|
u32 actual_time; /* RTC + 0x24 */
|
|
u32 keep_alive; /* RTC + 0x28 */
|
|
};
|
|
|
|
struct mpc5121_rtc_data {
|
|
unsigned irq;
|
|
unsigned irq_periodic;
|
|
struct mpc5121_rtc_regs __iomem *regs;
|
|
struct rtc_device *rtc;
|
|
struct rtc_wkalrm wkalarm;
|
|
};
|
|
|
|
/*
|
|
* Update second/minute/hour registers.
|
|
*
|
|
* This is just so alarm will work.
|
|
*/
|
|
static void mpc5121_rtc_update_smh(struct mpc5121_rtc_regs __iomem *regs,
|
|
struct rtc_time *tm)
|
|
{
|
|
out_8(®s->second_set, tm->tm_sec);
|
|
out_8(®s->minute_set, tm->tm_min);
|
|
out_8(®s->hour_set, tm->tm_hour);
|
|
|
|
/* set time sequence */
|
|
out_8(®s->set_time, 0x1);
|
|
out_8(®s->set_time, 0x3);
|
|
out_8(®s->set_time, 0x1);
|
|
out_8(®s->set_time, 0x0);
|
|
}
|
|
|
|
static int mpc5121_rtc_read_time(struct device *dev, struct rtc_time *tm)
|
|
{
|
|
struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
|
|
struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
|
|
unsigned long now;
|
|
|
|
/*
|
|
* linux time is actual_time plus the offset saved in target_time
|
|
*/
|
|
now = in_be32(®s->actual_time) + in_be32(®s->target_time);
|
|
|
|
rtc_time_to_tm(now, tm);
|
|
|
|
/*
|
|
* update second minute hour registers
|
|
* so alarms will work
|
|
*/
|
|
mpc5121_rtc_update_smh(regs, tm);
|
|
|
|
return rtc_valid_tm(tm);
|
|
}
|
|
|
|
static int mpc5121_rtc_set_time(struct device *dev, struct rtc_time *tm)
|
|
{
|
|
struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
|
|
struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
|
|
int ret;
|
|
unsigned long now;
|
|
|
|
/*
|
|
* The actual_time register is read only so we write the offset
|
|
* between it and linux time to the target_time register.
|
|
*/
|
|
ret = rtc_tm_to_time(tm, &now);
|
|
if (ret == 0)
|
|
out_be32(®s->target_time, now - in_be32(®s->actual_time));
|
|
|
|
/*
|
|
* update second minute hour registers
|
|
* so alarms will work
|
|
*/
|
|
mpc5121_rtc_update_smh(regs, tm);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mpc5121_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
|
|
{
|
|
struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
|
|
struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
|
|
|
|
*alarm = rtc->wkalarm;
|
|
|
|
alarm->pending = in_8(®s->alm_status);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mpc5121_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
|
|
{
|
|
struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
|
|
struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
|
|
|
|
/*
|
|
* the alarm has no seconds so deal with it
|
|
*/
|
|
if (alarm->time.tm_sec) {
|
|
alarm->time.tm_sec = 0;
|
|
alarm->time.tm_min++;
|
|
if (alarm->time.tm_min >= 60) {
|
|
alarm->time.tm_min = 0;
|
|
alarm->time.tm_hour++;
|
|
if (alarm->time.tm_hour >= 24)
|
|
alarm->time.tm_hour = 0;
|
|
}
|
|
}
|
|
|
|
alarm->time.tm_mday = -1;
|
|
alarm->time.tm_mon = -1;
|
|
alarm->time.tm_year = -1;
|
|
|
|
out_8(®s->alm_min_set, alarm->time.tm_min);
|
|
out_8(®s->alm_hour_set, alarm->time.tm_hour);
|
|
|
|
out_8(®s->alm_enable, alarm->enabled);
|
|
|
|
rtc->wkalarm = *alarm;
|
|
return 0;
|
|
}
|
|
|
|
static irqreturn_t mpc5121_rtc_handler(int irq, void *dev)
|
|
{
|
|
struct mpc5121_rtc_data *rtc = dev_get_drvdata((struct device *)dev);
|
|
struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
|
|
|
|
if (in_8(®s->int_alm)) {
|
|
/* acknowledge and clear status */
|
|
out_8(®s->int_alm, 1);
|
|
out_8(®s->alm_status, 1);
|
|
|
|
rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_AF);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
return IRQ_NONE;
|
|
}
|
|
|
|
static irqreturn_t mpc5121_rtc_handler_upd(int irq, void *dev)
|
|
{
|
|
struct mpc5121_rtc_data *rtc = dev_get_drvdata((struct device *)dev);
|
|
struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
|
|
|
|
if (in_8(®s->int_sec) && (in_8(®s->int_enable) & 0x1)) {
|
|
/* acknowledge */
|
|
out_8(®s->int_sec, 1);
|
|
|
|
rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_UF);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
return IRQ_NONE;
|
|
}
|
|
|
|
static int mpc5121_rtc_alarm_irq_enable(struct device *dev,
|
|
unsigned int enabled)
|
|
{
|
|
struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
|
|
struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
|
|
int val;
|
|
|
|
if (enabled)
|
|
val = 1;
|
|
else
|
|
val = 0;
|
|
|
|
out_8(®s->alm_enable, val);
|
|
rtc->wkalarm.enabled = val;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mpc5121_rtc_update_irq_enable(struct device *dev,
|
|
unsigned int enabled)
|
|
{
|
|
struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
|
|
struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
|
|
int val;
|
|
|
|
val = in_8(®s->int_enable);
|
|
|
|
if (enabled)
|
|
val = (val & ~0x8) | 0x1;
|
|
else
|
|
val &= ~0x1;
|
|
|
|
out_8(®s->int_enable, val);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct rtc_class_ops mpc5121_rtc_ops = {
|
|
.read_time = mpc5121_rtc_read_time,
|
|
.set_time = mpc5121_rtc_set_time,
|
|
.read_alarm = mpc5121_rtc_read_alarm,
|
|
.set_alarm = mpc5121_rtc_set_alarm,
|
|
.alarm_irq_enable = mpc5121_rtc_alarm_irq_enable,
|
|
.update_irq_enable = mpc5121_rtc_update_irq_enable,
|
|
};
|
|
|
|
static int __devinit mpc5121_rtc_probe(struct platform_device *op,
|
|
const struct of_device_id *match)
|
|
{
|
|
struct mpc5121_rtc_data *rtc;
|
|
int err = 0;
|
|
u32 ka;
|
|
|
|
rtc = kzalloc(sizeof(*rtc), GFP_KERNEL);
|
|
if (!rtc)
|
|
return -ENOMEM;
|
|
|
|
rtc->regs = of_iomap(op->dev.of_node, 0);
|
|
if (!rtc->regs) {
|
|
dev_err(&op->dev, "%s: couldn't map io space\n", __func__);
|
|
err = -ENOSYS;
|
|
goto out_free;
|
|
}
|
|
|
|
device_init_wakeup(&op->dev, 1);
|
|
|
|
dev_set_drvdata(&op->dev, rtc);
|
|
|
|
rtc->irq = irq_of_parse_and_map(op->dev.of_node, 1);
|
|
err = request_irq(rtc->irq, mpc5121_rtc_handler, IRQF_DISABLED,
|
|
"mpc5121-rtc", &op->dev);
|
|
if (err) {
|
|
dev_err(&op->dev, "%s: could not request irq: %i\n",
|
|
__func__, rtc->irq);
|
|
goto out_dispose;
|
|
}
|
|
|
|
rtc->irq_periodic = irq_of_parse_and_map(op->dev.of_node, 0);
|
|
err = request_irq(rtc->irq_periodic, mpc5121_rtc_handler_upd,
|
|
IRQF_DISABLED, "mpc5121-rtc_upd", &op->dev);
|
|
if (err) {
|
|
dev_err(&op->dev, "%s: could not request irq: %i\n",
|
|
__func__, rtc->irq_periodic);
|
|
goto out_dispose2;
|
|
}
|
|
|
|
ka = in_be32(&rtc->regs->keep_alive);
|
|
if (ka & 0x02) {
|
|
dev_warn(&op->dev,
|
|
"mpc5121-rtc: Battery or oscillator failure!\n");
|
|
out_be32(&rtc->regs->keep_alive, ka);
|
|
}
|
|
|
|
rtc->rtc = rtc_device_register("mpc5121-rtc", &op->dev,
|
|
&mpc5121_rtc_ops, THIS_MODULE);
|
|
if (IS_ERR(rtc->rtc)) {
|
|
err = PTR_ERR(rtc->rtc);
|
|
goto out_free_irq;
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_free_irq:
|
|
free_irq(rtc->irq_periodic, &op->dev);
|
|
out_dispose2:
|
|
irq_dispose_mapping(rtc->irq_periodic);
|
|
free_irq(rtc->irq, &op->dev);
|
|
out_dispose:
|
|
irq_dispose_mapping(rtc->irq);
|
|
iounmap(rtc->regs);
|
|
out_free:
|
|
kfree(rtc);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int __devexit mpc5121_rtc_remove(struct platform_device *op)
|
|
{
|
|
struct mpc5121_rtc_data *rtc = dev_get_drvdata(&op->dev);
|
|
struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
|
|
|
|
/* disable interrupt, so there are no nasty surprises */
|
|
out_8(®s->alm_enable, 0);
|
|
out_8(®s->int_enable, in_8(®s->int_enable) & ~0x1);
|
|
|
|
rtc_device_unregister(rtc->rtc);
|
|
iounmap(rtc->regs);
|
|
free_irq(rtc->irq, &op->dev);
|
|
free_irq(rtc->irq_periodic, &op->dev);
|
|
irq_dispose_mapping(rtc->irq);
|
|
irq_dispose_mapping(rtc->irq_periodic);
|
|
dev_set_drvdata(&op->dev, NULL);
|
|
kfree(rtc);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct of_device_id mpc5121_rtc_match[] __devinitdata = {
|
|
{ .compatible = "fsl,mpc5121-rtc", },
|
|
{},
|
|
};
|
|
|
|
static struct of_platform_driver mpc5121_rtc_driver = {
|
|
.driver = {
|
|
.name = "mpc5121-rtc",
|
|
.owner = THIS_MODULE,
|
|
.of_match_table = mpc5121_rtc_match,
|
|
},
|
|
.probe = mpc5121_rtc_probe,
|
|
.remove = __devexit_p(mpc5121_rtc_remove),
|
|
};
|
|
|
|
static int __init mpc5121_rtc_init(void)
|
|
{
|
|
return of_register_platform_driver(&mpc5121_rtc_driver);
|
|
}
|
|
module_init(mpc5121_rtc_init);
|
|
|
|
static void __exit mpc5121_rtc_exit(void)
|
|
{
|
|
of_unregister_platform_driver(&mpc5121_rtc_driver);
|
|
}
|
|
module_exit(mpc5121_rtc_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("John Rigby <jcrigby@gmail.com>");
|