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/*
* Real Time Clock driver for Marvell 88PM860x PMIC
*
* Copyright (c) 2010 Marvell International Ltd.
* Author: Haojian Zhuang <haojian.zhuang@marvell.com>
*
* 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/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/mutex.h>
#include <linux/rtc.h>
#include <linux/delay.h>
#include <linux/mfd/core.h>
#include <linux/mfd/88pm860x.h>
#define VRTC_CALIBRATION
struct pm860x_rtc_info {
struct pm860x_chip *chip;
struct i2c_client *i2c;
struct rtc_device *rtc_dev;
struct device *dev;
struct delayed_work calib_work;
int irq;
int vrtc;
int (*sync)(unsigned int ticks);
};
#define REG_VRTC_MEAS1 0x7D
#define REG0_ADDR 0xB0
#define REG1_ADDR 0xB2
#define REG2_ADDR 0xB4
#define REG3_ADDR 0xB6
#define REG0_DATA 0xB1
#define REG1_DATA 0xB3
#define REG2_DATA 0xB5
#define REG3_DATA 0xB7
/* bit definitions of Measurement Enable Register 2 (0x51) */
#define MEAS2_VRTC (1 << 0)
/* bit definitions of RTC Register 1 (0xA0) */
#define ALARM_EN (1 << 3)
#define ALARM_WAKEUP (1 << 4)
#define ALARM (1 << 5)
#define RTC1_USE_XO (1 << 7)
#define VRTC_CALIB_INTERVAL (HZ * 60 * 10) /* 10 minutes */
static irqreturn_t rtc_update_handler(int irq, void *data)
{
struct pm860x_rtc_info *info = (struct pm860x_rtc_info *)data;
int mask;
mask = ALARM | ALARM_WAKEUP;
pm860x_set_bits(info->i2c, PM8607_RTC1, mask | ALARM_EN, mask);
rtc_update_irq(info->rtc_dev, 1, RTC_AF);
return IRQ_HANDLED;
}
static int pm860x_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
{
struct pm860x_rtc_info *info = dev_get_drvdata(dev);
if (enabled)
pm860x_set_bits(info->i2c, PM8607_RTC1, ALARM, ALARM);
else
pm860x_set_bits(info->i2c, PM8607_RTC1, ALARM, 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 pm860x_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
struct pm860x_rtc_info *info = dev_get_drvdata(dev);
unsigned char buf[8];
unsigned long ticks, base, data;
pm860x_page_bulk_read(info->i2c, REG0_ADDR, 8, buf);
dev_dbg(info->dev, "%x-%x-%x-%x-%x-%x-%x-%x\n", buf[0], buf[1],
buf[2], buf[3], buf[4], buf[5], buf[6], buf[7]);
base = (buf[1] << 24) | (buf[3] << 16) | (buf[5] << 8) | buf[7];
/* load 32-bit read-only counter */
pm860x_bulk_read(info->i2c, PM8607_RTC_COUNTER1, 4, buf);
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 pm860x_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
struct pm860x_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 */
pm860x_bulk_read(info->i2c, PM8607_RTC_COUNTER1, 4, buf);
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);
pm860x_page_reg_write(info->i2c, REG0_DATA, (base >> 24) & 0xFF);
pm860x_page_reg_write(info->i2c, REG1_DATA, (base >> 16) & 0xFF);
pm860x_page_reg_write(info->i2c, REG2_DATA, (base >> 8) & 0xFF);
pm860x_page_reg_write(info->i2c, REG3_DATA, base & 0xFF);
if (info->sync)
info->sync(ticks);
return 0;
}
static int pm860x_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct pm860x_rtc_info *info = dev_get_drvdata(dev);
unsigned char buf[8];
unsigned long ticks, base, data;
int ret;
pm860x_page_bulk_read(info->i2c, REG0_ADDR, 8, buf);
dev_dbg(info->dev, "%x-%x-%x-%x-%x-%x-%x-%x\n", buf[0], buf[1],
buf[2], buf[3], buf[4], buf[5], buf[6], buf[7]);
base = (buf[1] << 24) | (buf[3] << 16) | (buf[5] << 8) | buf[7];
pm860x_bulk_read(info->i2c, PM8607_RTC_EXPIRE1, 4, buf);
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);
ret = pm860x_reg_read(info->i2c, PM8607_RTC1);
alrm->enabled = (ret & ALARM_EN) ? 1 : 0;
alrm->pending = (ret & (ALARM | ALARM_WAKEUP)) ? 1 : 0;
return 0;
}
static int pm860x_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct pm860x_rtc_info *info = dev_get_drvdata(dev);
struct rtc_time now_tm, alarm_tm;
unsigned long ticks, base, data;
unsigned char buf[8];
int mask;
pm860x_set_bits(info->i2c, PM8607_RTC1, ALARM_EN, 0);
pm860x_page_bulk_read(info->i2c, REG0_ADDR, 8, buf);
dev_dbg(info->dev
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