418 lines
12 KiB
C
418 lines
12 KiB
C
/*
|
|
* 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, "%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, &now_tm);
|
|
rtc_next_alarm_time(&alarm_tm, &now_tm, &alrm->time);
|
|
/* get new ticks for alarm in 24 hours */
|
|
rtc_tm_to_time(&alarm_tm, &ticks);
|
|
data = ticks - base;
|
|
|
|
buf[0] = data & 0xff;
|
|
buf[1] = (data >> 8) & 0xff;
|
|
buf[2] = (data >> 16) & 0xff;
|
|
buf[3] = (data >> 24) & 0xff;
|
|
pm860x_bulk_write(info->i2c, PM8607_RTC_EXPIRE1, 4, buf);
|
|
if (alrm->enabled) {
|
|
mask = ALARM | ALARM_WAKEUP | ALARM_EN;
|
|
pm860x_set_bits(info->i2c, PM8607_RTC1, mask, mask);
|
|
} else {
|
|
mask = ALARM | ALARM_WAKEUP | ALARM_EN;
|
|
pm860x_set_bits(info->i2c, PM8607_RTC1, mask,
|
|
ALARM | ALARM_WAKEUP);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const struct rtc_class_ops pm860x_rtc_ops = {
|
|
.read_time = pm860x_rtc_read_time,
|
|
.set_time = pm860x_rtc_set_time,
|
|
.read_alarm = pm860x_rtc_read_alarm,
|
|
.set_alarm = pm860x_rtc_set_alarm,
|
|
.alarm_irq_enable = pm860x_rtc_alarm_irq_enable,
|
|
};
|
|
|
|
#ifdef VRTC_CALIBRATION
|
|
static void calibrate_vrtc_work(struct work_struct *work)
|
|
{
|
|
struct pm860x_rtc_info *info = container_of(work,
|
|
struct pm860x_rtc_info, calib_work.work);
|
|
unsigned char buf[2];
|
|
unsigned int sum, data, mean, vrtc_set;
|
|
int i;
|
|
|
|
for (i = 0, sum = 0; i < 16; i++) {
|
|
msleep(100);
|
|
pm860x_bulk_read(info->i2c, REG_VRTC_MEAS1, 2, buf);
|
|
data = (buf[0] << 4) | buf[1];
|
|
data = (data * 5400) >> 12; /* convert to mv */
|
|
sum += data;
|
|
}
|
|
mean = sum >> 4;
|
|
vrtc_set = 2700 + (info->vrtc & 0x3) * 200;
|
|
dev_dbg(info->dev, "mean:%d, vrtc_set:%d\n", mean, vrtc_set);
|
|
|
|
sum = pm860x_reg_read(info->i2c, PM8607_RTC_MISC1);
|
|
data = sum & 0x3;
|
|
if ((mean + 200) < vrtc_set) {
|
|
/* try higher voltage */
|
|
if (++data == 4)
|
|
goto out;
|
|
data = (sum & 0xf8) | (data & 0x3);
|
|
pm860x_reg_write(info->i2c, PM8607_RTC_MISC1, data);
|
|
} else if ((mean - 200) > vrtc_set) {
|
|
/* try lower voltage */
|
|
if (data-- == 0)
|
|
goto out;
|
|
data = (sum & 0xf8) | (data & 0x3);
|
|
pm860x_reg_write(info->i2c, PM8607_RTC_MISC1, data);
|
|
} else
|
|
goto out;
|
|
dev_dbg(info->dev, "set 0x%x to RTC_MISC1\n", data);
|
|
/* trigger next calibration since VRTC is updated */
|
|
schedule_delayed_work(&info->calib_work, VRTC_CALIB_INTERVAL);
|
|
return;
|
|
out:
|
|
/* disable measurement */
|
|
pm860x_set_bits(info->i2c, PM8607_MEAS_EN2, MEAS2_VRTC, 0);
|
|
dev_dbg(info->dev, "finish VRTC calibration\n");
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
static int __devinit pm860x_rtc_probe(struct platform_device *pdev)
|
|
{
|
|
struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
|
|
struct pm860x_rtc_pdata *pdata = NULL;
|
|
struct pm860x_rtc_info *info;
|
|
struct rtc_time tm;
|
|
unsigned long ticks = 0;
|
|
int ret;
|
|
|
|
pdata = pdev->dev.platform_data;
|
|
if (pdata == NULL)
|
|
dev_warn(&pdev->dev, "No platform data!\n");
|
|
|
|
info = kzalloc(sizeof(struct pm860x_rtc_info), GFP_KERNEL);
|
|
if (!info)
|
|
return -ENOMEM;
|
|
info->irq = platform_get_irq(pdev, 0);
|
|
if (info->irq < 0) {
|
|
dev_err(&pdev->dev, "No IRQ resource!\n");
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
info->chip = chip;
|
|
info->i2c = (chip->id == CHIP_PM8607) ? chip->client : chip->companion;
|
|
info->dev = &pdev->dev;
|
|
dev_set_drvdata(&pdev->dev, info);
|
|
|
|
ret = request_threaded_irq(info->irq, NULL, rtc_update_handler,
|
|
IRQF_ONESHOT, "rtc", info);
|
|
if (ret < 0) {
|
|
dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
|
|
info->irq, ret);
|
|
goto out;
|
|
}
|
|
|
|
/* set addresses of 32-bit base value for RTC time */
|
|
pm860x_page_reg_write(info->i2c, REG0_ADDR, REG0_DATA);
|
|
pm860x_page_reg_write(info->i2c, REG1_ADDR, REG1_DATA);
|
|
pm860x_page_reg_write(info->i2c, REG2_ADDR, REG2_DATA);
|
|
pm860x_page_reg_write(info->i2c, REG3_ADDR, REG3_DATA);
|
|
|
|
ret = pm860x_rtc_read_time(&pdev->dev, &tm);
|
|
if (ret < 0) {
|
|
dev_err(&pdev->dev, "Failed to read initial time.\n");
|
|
goto out_rtc;
|
|
}
|
|
if ((tm.tm_year < 70) || (tm.tm_year > 138)) {
|
|
tm.tm_year = 70;
|
|
tm.tm_mon = 0;
|
|
tm.tm_mday = 1;
|
|
tm.tm_hour = 0;
|
|
tm.tm_min = 0;
|
|
tm.tm_sec = 0;
|
|
ret = pm860x_rtc_set_time(&pdev->dev, &tm);
|
|
if (ret < 0) {
|
|
dev_err(&pdev->dev, "Failed to set initial time.\n");
|
|
goto out_rtc;
|
|
}
|
|
}
|
|
rtc_tm_to_time(&tm, &ticks);
|
|
if (pdata && pdata->sync) {
|
|
pdata->sync(ticks);
|
|
info->sync = pdata->sync;
|
|
}
|
|
|
|
info->rtc_dev = rtc_device_register("88pm860x-rtc", &pdev->dev,
|
|
&pm860x_rtc_ops, THIS_MODULE);
|
|
ret = PTR_ERR(info->rtc_dev);
|
|
if (IS_ERR(info->rtc_dev)) {
|
|
dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
|
|
goto out_rtc;
|
|
}
|
|
|
|
/*
|
|
* enable internal XO instead of internal 3.25MHz clock since it can
|
|
* free running in PMIC power-down state.
|
|
*/
|
|
pm860x_set_bits(info->i2c, PM8607_RTC1, RTC1_USE_XO, RTC1_USE_XO);
|
|
|
|
#ifdef VRTC_CALIBRATION
|
|
/* <00> -- 2.7V, <01> -- 2.9V, <10> -- 3.1V, <11> -- 3.3V */
|
|
if (pdata && pdata->vrtc)
|
|
info->vrtc = pdata->vrtc & 0x3;
|
|
else
|
|
info->vrtc = 1;
|
|
pm860x_set_bits(info->i2c, PM8607_MEAS_EN2, MEAS2_VRTC, MEAS2_VRTC);
|
|
|
|
/* calibrate VRTC */
|
|
INIT_DELAYED_WORK(&info->calib_work, calibrate_vrtc_work);
|
|
schedule_delayed_work(&info->calib_work, VRTC_CALIB_INTERVAL);
|
|
#endif /* VRTC_CALIBRATION */
|
|
return 0;
|
|
out_rtc:
|
|
free_irq(info->irq, info);
|
|
out:
|
|
kfree(info);
|
|
return ret;
|
|
}
|
|
|
|
static int __devexit pm860x_rtc_remove(struct platform_device *pdev)
|
|
{
|
|
struct pm860x_rtc_info *info = platform_get_drvdata(pdev);
|
|
|
|
#ifdef VRTC_CALIBRATION
|
|
flush_scheduled_work();
|
|
/* disable measurement */
|
|
pm860x_set_bits(info->i2c, PM8607_MEAS_EN2, MEAS2_VRTC, 0);
|
|
#endif /* VRTC_CALIBRATION */
|
|
|
|
platform_set_drvdata(pdev, NULL);
|
|
rtc_device_unregister(info->rtc_dev);
|
|
free_irq(info->irq, info);
|
|
kfree(info);
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver pm860x_rtc_driver = {
|
|
.driver = {
|
|
.name = "88pm860x-rtc",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.probe = pm860x_rtc_probe,
|
|
.remove = __devexit_p(pm860x_rtc_remove),
|
|
};
|
|
|
|
module_platform_driver(pm860x_rtc_driver);
|
|
|
|
MODULE_DESCRIPTION("Marvell 88PM860x RTC driver");
|
|
MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
|
|
MODULE_LICENSE("GPL");
|