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/*
* TX4939 internal RTC driver
* Based on RBTX49xx patch from CELF patch archive.
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* (C) Copyright TOSHIBA CORPORATION 2005-2007
*/
#include <linux/rtc.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/io.h>
#include <linux/gfp.h>
#include <asm/txx9/tx4939.h>
struct tx4939rtc_plat_data {
struct rtc_device *rtc;
struct tx4939_rtc_reg __iomem *rtcreg;
spinlock_t lock;
};
static struct tx4939rtc_plat_data *get_tx4939rtc_plat_data(struct device *dev)
{
return platform_get_drvdata(to_platform_device(dev));
}
static int tx4939_rtc_cmd(struct tx4939_rtc_reg __iomem *rtcreg, int cmd)
{
int i = 0;
__raw_writel(cmd, &rtcreg->ctl);
/* This might take 30us (next 32.768KHz clock) */
while (__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_BUSY) {
/* timeout on approx. 100us (@ GBUS200MHz) */
if (i++ > 200 * 100)
return -EBUSY;
cpu_relax();
}
return 0;
}
static int tx4939_rtc_set_mmss(struct device *dev, unsigned long secs)
{
struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev);
struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg;
int i, ret;
unsigned char buf[6];
buf[0] = 0;
buf[1] = 0;
buf[2] = secs;
buf[3] = secs >> 8;
buf[4] = secs >> 16;
buf[5] = secs >> 24;
spin_lock_irq(&pdata->lock);
__raw_writel(0, &rtcreg->adr);
for (i = 0; i < 6; i++)
__raw_writel(buf[i], &rtcreg->dat);
ret = tx4939_rtc_cmd(rtcreg,
TX4939_RTCCTL_COMMAND_SETTIME |
(__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_ALME));
spin_unlock_irq(&pdata->lock);
return ret;
}
static int tx4939_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev);
struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg;
int i, ret;
unsigned long sec;
unsigned char buf[6];
spin_lock_irq(&pdata->lock);
ret = tx4939_rtc_cmd(rtcreg,
TX4939_RTCCTL_COMMAND_GETTIME |
(__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_ALME));
if (ret) {
spin_unlock_irq(&pdata->lock);
return ret;
}
__raw_writel(2, &rtcreg->adr);
for (i = 2; i < 6; i++)
buf[i] = __raw_readl(&rtcreg->dat);
spin_unlock_irq(&pdata->lock);
sec = (buf[5] << 24) | (buf[4] << 16) | (buf[3] << 8) | buf[2];
rtc_time_to_tm(sec, tm);
return rtc_valid_tm(tm);
}
static int tx4939_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev);
struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg;
int i, ret;
unsigned long sec;
unsigned char buf[6];
if (alrm->time.tm_sec < 0 ||
alrm->time.tm_min < 0 ||
alrm->time.tm_hour < 0 ||
alrm->time.tm_mday < 0 ||
alrm->time.tm_mon < 0 ||
alrm->time.tm_year < 0)
return -EINVAL;
rtc_tm_to_time(&alrm->time, &sec);
buf[0] = 0;
buf[1] = 0;
buf[2] = sec;
buf[3] = sec >> 8;
buf[4] = sec >> 16;
buf[5] = sec >> 24;
spin_lock_irq(&pdata->lock);
__raw_writel(0, &rtcreg->adr);
for (i = 0; i < 6; i++)
__raw_writel(buf[i], &rtcreg->dat);
ret = tx4939_rtc_cmd(rtcreg, TX4939_RTCCTL_COMMAND_SETALARM |
(alrm->enabled ? TX4939_RTCCTL_ALME : 0));
spin_unlock_irq(&pdata->lock);
return ret;
}
static int tx4939_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev);
struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg;
int i, ret;
unsigned long sec;
unsigned char buf[6];
u32 ctl;
spin_lock_irq(&pdata->lock);
ret = tx4939_rtc_cmd(rtcreg,
TX4939_RTCCTL_COMMAND_GETALARM |
(__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_ALME));
if (ret) {
spin_unlock_irq(&pdata->lock);
return ret;
}
__raw_writel(2, &rtcreg->adr);
for (i = 2; i < 6; i++)
buf[i] = __raw_readl(&rtcreg->dat);
ctl = __raw_readl(&rtcreg->ctl);
alrm->enabled = (ctl & TX4939_RTCCTL_ALME) ? 1 : 0;
alrm->pending = (ctl & TX4939_RTCCTL_ALMD) ? 1 : 0;
spin_unlock_irq(&pdata->lock);
sec = (buf[5] << 24) | (buf[4] << 16) | (buf[3] << 8) | buf[2];
rtc_time_to_tm(sec, &alrm->time);
return rtc_valid_tm(&alrm->time);
}
static int tx4939_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
{
struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev);
spin_lock_irq(&pdata->lock);
tx4939_rtc_cmd(pdata->rtcreg,
TX4939_RTCCTL_COMMAND_NOP |
(enabled ? TX4939_RTCCTL_ALME : 0));
spin_unlock_irq(&pdata->lock);
return 0;
}
static irqreturn_t tx4939_rtc_interrupt(int irq, void *dev_id)
{
struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev_id);
struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg;
unsigned long events = RTC_IRQF;
spin_lock(&pdata->lock);
if (__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_ALMD) {
events |= RTC_AF;
tx4939_rtc_cmd(rtcreg, TX4939_RTCCTL_COMMAND_NOP);
}
spin_unlock(&pdata->lock);
rtc_update_irq(pdata->rtc, 1, events);
return IRQ_HANDLED;
}
static const struct rtc_class_ops tx4939_rtc_ops = {
.read_time = tx4939_rtc_read_time,
.read_alarm = tx4939_rtc_read_alarm,
.set_alarm = tx4939_rtc_set_alarm,
.set_mmss = tx4939_rtc_set_mmss,
.alarm_irq_enable = tx4939_rtc_alarm_irq_enable,
};
static ssize_t tx4939_rtc_nvram_read(struct file *filp, struct kobject *kobj,
struct bin_attribute *bin_attr,
char *buf, loff_t pos, size_t size)
{
struct device *dev = container_of(kobj, struct device, kobj);
struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev);
struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg;
ssize_t count;
spin_lock_irq(&pdata->lock);
for (count = 0; size > 0 && pos < TX4939_RTC_REG_RAMSIZE;
count++, size--) {
__raw_writel(pos++, &rtcreg->adr);
*buf++ = __raw_readl(
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