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/*
* Real Time Clock driver for Marvell 88PM80x PMIC
*
* Copyright (c) 2012 Marvell International Ltd.
* Wenzeng Chen<wzch@marvell.com>
* Qiao Zhou <zhouqiao@marvell.com>
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/regmap.h>
#include <linux/mfd/core.h>
#include <linux/mfd/88pm80x.h>
#include <linux/rtc.h>
#define PM800_RTC_COUNTER1 (0xD1)
#define PM800_RTC_COUNTER2 (0xD2)
#define PM800_RTC_COUNTER3 (0xD3)
#define PM800_RTC_COUNTER4 (0xD4)
#define PM800_RTC_EXPIRE1_1 (0xD5)
#define PM800_RTC_EXPIRE1_2 (0xD6)
#define PM800_RTC_EXPIRE1_3 (0xD7)
#define PM800_RTC_EXPIRE1_4 (0xD8)
#define PM800_RTC_TRIM1 (0xD9)
#define PM800_RTC_TRIM2 (0xDA)
#define PM800_RTC_TRIM3 (0xDB)
#define PM800_RTC_TRIM4 (0xDC)
#define PM800_RTC_EXPIRE2_1 (0xDD)
#define PM800_RTC_EXPIRE2_2 (0xDE)
#define PM800_RTC_EXPIRE2_3 (0xDF)
#define PM800_RTC_EXPIRE2_4 (0xE0)
#define PM800_POWER_DOWN_LOG1 (0xE5)
#define PM800_POWER_DOWN_LOG2 (0xE6)
struct pm80x_rtc_info {
struct pm80x_chip *chip;
struct regmap *map;
struct rtc_device *rtc_dev;
struct device *dev;
struct delayed_work calib_work;
int irq;
int vrtc;
};
static irqreturn_t rtc_update_handler(int irq, void *data)
{
struct pm80x_rtc_info *info = (struct pm80x_rtc_info *)data;
int mask;
mask = PM800_ALARM | PM800_ALARM_WAKEUP;
regmap_update_bits(info->map, PM800_RTC_CONTROL, mask | PM800_ALARM1_EN,
mask);
rtc_update_irq(info->rtc_dev, 1, RTC_AF);
return IRQ_HANDLED;
}
static int pm80x_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
{
struct pm80x_rtc_info *info = dev_get_drvdata(dev);
if (enabled)
regmap_update_bits(info->map, PM800_RTC_CONTROL,
PM800_ALARM1_EN, PM800_ALARM1_EN);
else
regmap_update_bits(info->map, PM800_RTC_CONTROL,
PM800_ALARM1_EN, 0);
return 0;
}
/*
* Calculate the next alarm time given the requested alarm time mask
* and the current time.
*/
static void rtc_next_alarm_time(struct rtc_time *next, struct rtc_time *now,
struct rtc_time *alrm)
{
unsigned long next_time;
unsigned long now_time;
next->tm_year = now->tm_year;
next->tm_mon = now->tm_mon;
next->tm_mday = now->tm_mday;
next->tm_hour = alrm->tm_hour;
next->tm_min = alrm->tm_min;
next->tm_sec = alrm->tm_sec;
rtc_tm_to_time(now, &now_time);
rtc_tm_to_time(next, &next_time);
if (next_time < now_time) {
/* Advance one day */
next_time += 60 * 60 * 24;
rtc_time_to_tm(next_time, next);
}
}
static int pm80x_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
struct pm80x_rtc_info *info = dev_get_drvdata(dev);
unsigned char buf[4];
unsigned long ticks, base, data;
regmap_raw_read(info->map, PM800_RTC_EXPIRE2_1, buf, 4);
base = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
dev_dbg(info->dev, "%x-%x-%x-%x\n", buf[0], buf[1], buf[2], buf[3]);
/* load 32-bit read-only counter */
regmap_raw_read(info->map, PM800_RTC_COUNTER1, buf, 4);
data = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
ticks = base + data;
dev_dbg(info->dev, "get base:0x%lx, RO count:0x%lx, ticks:0x%lx\n",
base, data, ticks);
rtc_time_to_tm(ticks, tm);
return 0;
}
static int pm80x_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
struct pm80x_rtc_info *info = dev_get_drvdata(dev);
unsigned char buf[4];
unsigned long ticks, base, data;
if ((tm->tm_year < 70) || (tm->tm_year > 138)) {
dev_dbg(info->dev,
"Set time %d out of range. Please set time between 1970 to 2038.\n",
1900 + tm->tm_year);
return -EINVAL;
}
rtc_tm_to_time(tm, &ticks);
/* load 32-bit read-only counter */
regmap_raw_read(info->map, PM800_RTC_COUNTER1, buf, 4);
data = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
base = ticks - data;
dev_dbg(info->dev, "set base:0x%lx, RO count:0x%lx, ticks:0x%lx\n",
base, data, ticks);
buf[0] = base & 0xFF;
buf[1] = (base >> 8) & 0xFF;
buf[2] = (base >> 16) & 0xFF;
buf[3] = (base >> 24) & 0xFF;
regmap_raw_write(info->map, PM800_RTC_EXPIRE2_1, buf, 4);
return 0;
}
static int pm80x_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct pm80x_rtc_info *info = dev_get_drvdata(dev);
unsigned char buf[4];
unsigned long ticks, base, data;
int ret;
regmap_raw_read(info->map, PM800_RTC_EXPIRE2_1, buf, 4);
base = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
dev_dbg(info->dev, "%x-%x-%x-%x\n", buf[0], buf[1], buf[2], buf[3]);
regmap_raw_read(info->map, PM800_RTC_EXPIRE1_1, buf, 4);
data = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
ticks = base + data;
dev_dbg(info->dev, "get base:0x%lx, RO count:0x%lx, ticks:0x%lx\n",
base, data, ticks);
rtc_time_to_tm(ticks, &alrm->time);
regmap_read(info->map, PM800_RTC_CONTROL, &ret);
alrm->enabled = (ret & PM800_ALARM1_EN) ? 1 : 0;
alrm->pending = (ret & (PM800_ALARM | PM800_ALARM_WAKEUP)) ? 1 : 0;
return 0;
}
static int pm80x_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct pm80x_rtc_info *info = dev_get_drvdata(dev);
struct rtc_time now_tm, alarm_tm;
unsigned long ticks, base, data;
unsigned char buf[4];
int mask;
regmap_update_bits(info->map, PM800_RTC_CONTROL, PM800_ALARM1_EN, 0);
regmap_raw_read(info->map, PM800_RTC_EXPIRE2_1, buf, 4);
base = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
dev_dbg(info->dev, "%x-%x-%x-%x\n", buf[0], buf[1], buf[2], buf[3]);
/* load 32-bit read-only counter */
regmap_raw_read(info->map, PM800_RTC_COUNTER1, buf, 4);
data = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
ticks = base + data;
dev_dbg(info->dev, "get base:0x%lx, RO count:0x%lx, ticks:0x%lx\n"
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