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sdk-hwV1.3/lichee/linux-4.9/drivers/rtc/rtc-sunxi.c

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/*
* An RTC driver for Sunxi Platform of Allwinner SoC
*
* Copyright (c) 2013, Carlo Caione <carlo.caione@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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.
*
*/
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/rtc.h>
#include <linux/types.h>
#include <linux/reboot.h>
#include <linux/pm_wakeirq.h>
#include <linux/clk.h>
#include "rtc-sunxi.h"
static void __iomem *global_pgregbase;
static void __iomem *boot_reasonbase;
atomic_t rtc_sync_flag = ATOMIC_INIT(0);
static struct sunxi_rtc_data_year data_year_param =
#if (defined CONFIG_ARCH_SUN50IW1)
{
.min = 2010,
.max = 2073,
.mask = 0x3f,
.yshift = 16,
.leap_shift = 22,
};
#else
{
.min = 1970,
.max = 2097,
.mask = 0x7f,
.yshift = 16,
.leap_shift = 23,
};
#endif
#ifdef CONFIG_SUNXI_BOOTUP_EXTEND
enum {
SUNXI_RTC_BOOT_REASON_NONE = 0,
SUNXI_RTC_BOOT_REASON_COLD_BOOT,
SUNXI_RTC_BOOT_REASON_HOT_REBOOT,
SUNXI_RTC_BOOT_REASON_PANIC_REBOOT,
SUNXI_RTC_BOOT_REASON_MAX,
};
#endif
#ifdef CONFIG_RTC_SHUTDOWN_ALARM
static int alarm_in_booting;
module_param_named(alarm_in_booting, alarm_in_booting, int, S_IRUGO | S_IWUSR);
static void sunxi_rtc_alarm_in_boot(struct sunxi_rtc_dev *rtc)
{
unsigned int cnt, cur, en, int_ctrl, int_stat;
/*
* when alarm irq occur at boot0~rtc_driver.probe() process in shutdown
* charger mode, /charger in userspace must know this irq through sysfs
* node 'alarm_in_booting' to reboot and startup system.
*/
cnt = readl(rtc->base + SUNXI_ALRM_COUNTER);
cur = readl(rtc->base + SUNXI_ALRM_CURRENT);
en = readl(rtc->base + SUNXI_ALRM_EN);
int_ctrl = readl(rtc->base + SUNXI_ALRM_IRQ_EN);
int_stat = readl(rtc->base + SUNXI_ALRM_IRQ_STA);
if (int_stat && int_ctrl && en && (cnt <= cur))
alarm_in_booting = 1;
}
#endif
static irqreturn_t sunxi_rtc_alarmirq(int irq, void *id)
{
struct sunxi_rtc_dev *chip = (struct sunxi_rtc_dev *) id;
u32 val;
val = readl(chip->base + SUNXI_ALRM_IRQ_STA);
if (val & SUNXI_ALRM_IRQ_STA_CNT_IRQ_PEND) {
val |= SUNXI_ALRM_IRQ_STA_CNT_IRQ_PEND;
writel(val, chip->base + SUNXI_ALRM_IRQ_STA);
rtc_update_irq(chip->rtc, 1, RTC_AF | RTC_IRQF);
return IRQ_HANDLED;
}
return IRQ_NONE;
}
static void sunxi_rtc_setaie(int to, struct sunxi_rtc_dev *chip)
{
u32 alrm_val = 0;
u32 alrm_irq_val = 0;
if (to) {
alrm_val = readl(chip->base + SUNXI_ALRM_EN);
alrm_val |= SUNXI_ALRM_EN_CNT_EN;
alrm_irq_val = readl(chip->base + SUNXI_ALRM_IRQ_EN);
alrm_irq_val |= SUNXI_ALRM_IRQ_EN_CNT_IRQ_EN;
} else {
writel(SUNXI_ALRM_IRQ_STA_CNT_IRQ_PEND,
chip->base + SUNXI_ALRM_IRQ_STA);
}
writel(alrm_val, chip->base + SUNXI_ALRM_EN);
writel(alrm_irq_val, chip->base + SUNXI_ALRM_IRQ_EN);
}
static int sunxi_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm);
#ifdef SUNXI_SIMPLIFIED_TIMER
static short month_days[2][13] = {
{0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
{0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
};
static int sunxi_rtc_day_to_ymd(struct rtc_time *rtc_tm, u32 min_year,
u32 udate)
{
static u32 last_date;
static int last_year, last_mon, last_mday;
int year = 0, leap, i;
int date = (int)udate;
if (date == last_date) {
rtc_tm->tm_mday = last_mday;
rtc_tm->tm_mon = last_mon;
rtc_tm->tm_year = last_year;
return 0;
}
year = min_year;
while (1) {
if (is_leap_year(year)) {
if (date > 366) {
year++;
date -= 366;
} else
break;
} else {
if (date > 365) {
year++;
date -= 365;
} else
break;
}
}
rtc_tm->tm_year = year - 1900;
last_year = rtc_tm->tm_year;
leap = is_leap_year(rtc_tm->tm_year);
for (i = 1; date > month_days[leap][i]; i++)
date -= month_days[leap][i];
rtc_tm->tm_mon = i;
last_mon = rtc_tm->tm_mon;
rtc_tm->tm_mday = date;
last_mday = rtc_tm->tm_mday;
return 0;
}
#endif
static int sunxi_rtc_getalarm(struct device *dev, struct rtc_wkalrm *wkalrm)
{
struct sunxi_rtc_dev *chip = dev_get_drvdata(dev);
struct rtc_time *alrm_tm = &wkalrm->time;
u32 alrm_en;
#ifdef SUNXI_ALARM1_USED
u32 alrm;
u32 date;
#else
#ifndef SUNXI_SIMPLIFIED_TIMER
u32 alarm_cur = 0, alarm_cnt = 0;
unsigned long alarm_seconds = 0;
int ret;
#else
u32 alrm, date;
#endif /* end of SUNXI_SIMPLIFIED_TIMER */
#endif
#ifdef SUNXI_ALARM1_USED
alrm = readl(chip->base + SUNXI_ALRM_DHMS);
date = readl(chip->base + SUNXI_RTC_YMD);
alrm_tm->tm_sec = SUNXI_ALRM_GET_SEC_VALUE(alrm);
alrm_tm->tm_min = SUNXI_ALRM_GET_MIN_VALUE(alrm);
alrm_tm->tm_hour = SUNXI_ALRM_GET_HOUR_VALUE(alrm);
alrm_tm->tm_mday = SUNXI_DATE_GET_DAY_VALUE(date);
alrm_tm->tm_mon = SUNXI_DATE_GET_MON_VALUE(date);
alrm_tm->tm_year = SUNXI_DATE_GET_YEAR_VALUE(date, chip->data_year);
alrm_tm->tm_mon -= 1;
/*
* switch from (data_year->min)-relative offset to
* a (1900)-relative one
*/
alrm_tm->tm_year += SUNXI_YEAR_OFF(chip->data_year);
#else
#ifndef SUNXI_SIMPLIFIED_TIMER
alarm_cnt = readl(chip->base + SUNXI_ALRM_COUNTER);
alarm_cur = readl(chip->base + SUNXI_ALRM_CURRENT);
dev_dbg(dev, "alarm_cnt: %d, alarm_cur: %d\n", alarm_cnt, alarm_cur);
if (alarm_cur > alarm_cnt) {
/* alarm is disabled. */
wkalrm->enabled = 0;
alrm_tm->tm_mon = -1;
alrm_tm->tm_mday = -1;
alrm_tm->tm_year = -1;
alrm_tm->tm_hour = -1;
alrm_tm->tm_min = -1;
alrm_tm->tm_sec = -1;
return 0;
}
ret = sunxi_rtc_gettime(dev, alrm_tm);
if (ret)
return -EINVAL;
rtc_tm_to_time(alrm_tm, &alarm_seconds);
alarm_cnt = (alarm_cnt - alarm_cur);
alarm_cur = 0;
alarm_seconds += alarm_cnt;
rtc_time_to_tm(alarm_seconds, alrm_tm);
dev_dbg(dev, "alarm_seconds: %ld\n", alarm_seconds);
#else
alrm = readl(chip->base + SUNXI_ALRM_HMS);
date = readl(chip->base + SUNXI_ALRM_DAY);
alrm_tm->tm_sec = SUNXI_ALRM_GET_SEC_VALUE(alrm);
alrm_tm->tm_min = SUNXI_ALRM_GET_MIN_VALUE(alrm);
alrm_tm->tm_hour = SUNXI_ALRM_GET_HOUR_VALUE(alrm);
sunxi_rtc_day_to_ymd(alrm_tm, chip->data_year->min, date);
alrm_tm->tm_mon -= 1;
#endif /* end of SUNXI_SIMPLIFIED_TIMER */
#endif
alrm_en = readl(chip->base + SUNXI_ALRM_IRQ_EN);
if (alrm_en & SUNXI_ALRM_EN_CNT_EN)
wkalrm->enabled = 1;
return 0;
}
static int sunxi_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
{
struct sunxi_rtc_dev *chip = dev_get_drvdata(dev);
u32 date, time;
#if (defined CONFIG_ARCH_SUN8IW19) || \
(defined CONFIG_ARCH_SUN50IW9) || \
(defined CONFIG_ARCH_SUN8IW11)
/*
* we must wait 500ms for rtc reg sync when power up first,
* include reset and standby up
*/
if (atomic_read(&rtc_sync_flag))
msleep(500);
#endif
/*
* read again in case it changes
*/
do {
date = readl(chip->base + SUNXI_RTC_YMD);
time = readl(chip->base + SUNXI_RTC_HMS);
} while ((date != readl(chip->base + SUNXI_RTC_YMD)) ||
(time != readl(chip->base + SUNXI_RTC_HMS)));
rtc_tm->tm_sec = SUNXI_TIME_GET_SEC_VALUE(time);
rtc_tm->tm_min = SUNXI_TIME_GET_MIN_VALUE(time);
rtc_tm->tm_hour = SUNXI_TIME_GET_HOUR_VALUE(time);
#ifndef SUNXI_SIMPLIFIED_TIMER
rtc_tm->tm_mday = SUNXI_DATE_GET_DAY_VALUE(date);
rtc_tm->tm_mon = SUNXI_DATE_GET_MON_VALUE(date);
rtc_tm->tm_year = SUNXI_DATE_GET_YEAR_VALUE(date, chip->data_year);
/*
* switch from (data_year->min)-relative offset to
* a (1900)-relative one
*/
rtc_tm->tm_year += SUNXI_YEAR_OFF(chip->data_year);
#else
sunxi_rtc_day_to_ymd(rtc_tm, chip->data_year->min, date);
#endif
rtc_tm->tm_mon -= 1;
dev_dbg(dev, "Read hardware RTC time %04d-%02d-%02d %02d:%02d:%02d\n",
rtc_tm->tm_year + 1900, rtc_tm->tm_mon + 1, rtc_tm->tm_mday,
rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);
return rtc_valid_tm(rtc_tm);
}
static int sunxi_rtc_wait(struct sunxi_rtc_dev *chip, int offset,
unsigned int mask, unsigned int ms_timeout)
{
const unsigned long timeout = jiffies + msecs_to_jiffies(ms_timeout);
u32 reg;
do {
reg = readl(chip->base + offset);
reg &= mask;
if (reg != mask)
return 0;
} while (time_before(jiffies, timeout));
return -ETIMEDOUT;
}
static int sunxi_rtc_setalarm(struct device *dev, struct rtc_wkalrm *wkalrm)
{
struct sunxi_rtc_dev *chip = dev_get_drvdata(dev);
struct rtc_time *alrm_tm = &wkalrm->time;
struct rtc_time tm_now;
u32 alrm;
time64_t diff;
unsigned long time_gap;
unsigned long time_gap_day;
#if defined(SUNXI_ALARM1_USED)
unsigned long time_gap_hour = 0;
unsigned long time_gap_min = 0;
#endif
int ret;
ret = sunxi_rtc_gettime(dev, &tm_now);
if (ret < 0) {
dev_err(dev, "Error in getting time\n");
return -EINVAL;
}
diff = rtc_tm_sub(alrm_tm, &tm_now);
if (diff <= 0) {
dev_err(dev, "Date to set in the past\n");
return -EINVAL;
}
if (diff > 255 * SEC_IN_DAY) {
dev_err(dev, "Day must be in the range 0 - 255\n");
return -EINVAL;
}
time_gap = diff;
time_gap_day = alrm_tm->tm_mday - tm_now.tm_mday;
#ifdef SUNXI_SIMPLIFIED_TIMER
sunxi_rtc_setaie(0, chip);
if (sunxi_rtc_wait(chip, SUNXI_LOSC_CTRL,
SUNXI_LOSC_CTRL_RTC_ALARM_ACC, 50)) {
dev_err(dev, "Failed to set rtc alarm1.\n");
return -1;
}
writel(0, chip->base + SUNXI_ALRM_DAY);
if (sunxi_rtc_wait(chip, SUNXI_LOSC_CTRL,
SUNXI_LOSC_CTRL_RTC_ALARM_ACC, 50)) {
dev_err(dev, "Failed to set rtc alarm1.\n");
return -1;
}
msleep(2);
writel(0, chip->base + SUNXI_ALRM_HMS);
if (sunxi_rtc_wait(chip, SUNXI_LOSC_CTRL,
SUNXI_LOSC_CTRL_RTC_ALARM_ACC, 50)) {
dev_err(dev, "Failed to set rtc alarm1.\n");
return -1;
}
msleep(2);
writel(time_gap_day + readl(chip->base + SUNXI_RTC_YMD),
chip->base + SUNXI_ALRM_DAY);
alrm = SUNXI_ALRM_SET_SEC_VALUE(alrm_tm->tm_sec) |
SUNXI_ALRM_SET_MIN_VALUE(alrm_tm->tm_min) |
SUNXI_ALRM_SET_HOUR_VALUE(alrm_tm->tm_hour);
if (sunxi_rtc_wait(chip, SUNXI_LOSC_CTRL,
SUNXI_LOSC_CTRL_RTC_ALARM_ACC, 50)) {
dev_err(dev, "Failed to set rtc alarm1.\n");
return -1;
}
msleep(2);
writel(alrm, chip->base + SUNXI_ALRM_HMS);
if (sunxi_rtc_wait(chip, SUNXI_LOSC_CTRL,
SUNXI_LOSC_CTRL_RTC_ALARM_ACC, 50)) {
dev_err(dev, "Failed to set rtc alarm1.\n");
return -1;
}
msleep(2);
#else
#ifdef SUNXI_ALARM1_USED
time_gap -= time_gap_day * SEC_IN_DAY;
time_gap_hour = time_gap / SEC_IN_HOUR;
time_gap -= time_gap_hour * SEC_IN_HOUR;
time_gap_min = time_gap / SEC_IN_MIN;
time_gap -= time_gap_min * SEC_IN_MIN;
#endif /* end of SUNXI_ALARM1_USED */
sunxi_rtc_setaie(0, chip);
#ifdef SUNXI_ALARM1_USED
if (sunxi_rtc_wait(chip, SUNXI_LOSC_CTRL,
SUNXI_LOSC_CTRL_RTC_ALARM_ACC, 50)) {
dev_err(dev, "Failed to set rtc alarm1.\n");
return -1;
}
msleep(2);
writel(0, chip->base + SUNXI_ALRM_DHMS);
if (sunxi_rtc_wait(chip, SUNXI_LOSC_CTRL,
SUNXI_LOSC_CTRL_RTC_ALARM_ACC, 50)) {
dev_err(dev, "Failed to set rtc alarm1.\n");
return -1;
}
msleep(2);
alrm = SUNXI_ALRM_SET_SEC_VALUE(time_gap) |
SUNXI_ALRM_SET_MIN_VALUE(time_gap_min) |
SUNXI_ALRM_SET_HOUR_VALUE(time_gap_hour) |
SUNXI_ALRM_SET_DAY_VALUE(time_gap_day);
writel(alrm, chip->base + SUNXI_ALRM_DHMS);
if (sunxi_rtc_wait(chip, SUNXI_LOSC_CTRL,
SUNXI_LOSC_CTRL_RTC_ALARM_ACC, 50)) {
dev_err(dev, "Failed to set rtc alarm1.\n");
return -1;
}
msleep(2);
#else
writel(0, chip->base + SUNXI_ALRM_COUNTER);
alrm = time_gap;
dev_dbg(dev, "set alarm seconds:%d enable:%d\n", alrm, wkalrm->enabled);
writel(alrm, chip->base + SUNXI_ALRM_COUNTER);
#endif /* end of SUNXI_ALARM1_USED */
#endif /* end of SUNXI_SIMPLIFIED_TIMER */
writel(0, chip->base + SUNXI_ALRM_IRQ_EN);
writel(SUNXI_ALRM_IRQ_EN_CNT_IRQ_EN, chip->base + SUNXI_ALRM_IRQ_EN);
sunxi_rtc_setaie(wkalrm->enabled, chip);
return 0;
}
static int sunxi_rtc_settime(struct device *dev, struct rtc_time *rtc_tm)
{
struct sunxi_rtc_dev *chip = dev_get_drvdata(dev);
u32 date = 0;
u32 time = 0;
int year;
#ifdef SUNXI_SIMPLIFIED_TIMER
int i, leap;
#endif
/*
* the input rtc_tm->tm_year is the offset relative to 1900. We use
* the SUNXI_YEAR_OFF macro to rebase it with respect to the min year
* allowed by the hardware
*/
year = rtc_tm->tm_year + 1900;
if (rtc_valid_tm(rtc_tm) || year < chip->data_year->min
|| year > chip->data_year->max) {
dev_err(dev, "rtc only supports year in range %d - %d\n",
chip->data_year->min, chip->data_year->max);
return -EINVAL;
}
#ifndef SUNXI_SIMPLIFIED_TIMER
rtc_tm->tm_year -= SUNXI_YEAR_OFF(chip->data_year);
rtc_tm->tm_mon += 1;
dev_dbg(dev, "Will set hardware RTC time %04d-%02d-%02d %02d:%02d:%02d\n",
rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday,
rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);
date = SUNXI_DATE_SET_DAY_VALUE(rtc_tm->tm_mday) |
SUNXI_DATE_SET_MON_VALUE(rtc_tm->tm_mon) |
SUNXI_DATE_SET_YEAR_VALUE(rtc_tm->tm_year, chip->data_year);
if (is_leap_year(year))
date |= SUNXI_LEAP_SET_VALUE(1, chip->data_year->leap_shift);
#else
date = rtc_tm->tm_mday;
rtc_tm->tm_mon += 1;
leap = is_leap_year(year);
for (i = 1; i < rtc_tm->tm_mon; i++)
date += month_days[leap][i];
for (i = year - 1; i >= chip->data_year->min; i--) {
if (is_leap_year(i))
date += 366;
else
date += 365;
}
#endif
time = SUNXI_TIME_SET_SEC_VALUE(rtc_tm->tm_sec) |
SUNXI_TIME_SET_MIN_VALUE(rtc_tm->tm_min) |
SUNXI_TIME_SET_HOUR_VALUE(rtc_tm->tm_hour);
/*
* before we write the RTC HH-MM-SS register,we
* should check the SUNXI_LOSC_CTRL_RTC_HMS_ACC bit
*/
if (sunxi_rtc_wait(chip, SUNXI_LOSC_CTRL,
SUNXI_LOSC_CTRL_RTC_HMS_ACC, 50)) {
dev_err(dev, "Failed to set rtc time.\n");
return -1;
}
msleep(2);
writel(time, chip->base + SUNXI_RTC_HMS);
/*
* After writing the RTC HH-MM-SS register, the
* SUNXI_LOSC_CTRL_RTC_HMS_ACC bit is set and it will not
* be cleared until the real writing operation is finished
*/
if (sunxi_rtc_wait(chip, SUNXI_LOSC_CTRL,
SUNXI_LOSC_CTRL_RTC_HMS_ACC, 50)) {
dev_err(dev, "Failed to set rtc time.\n");
return -1;
}
msleep(2);
/*
* After writing the RTC YY-MM-DD register, the
* SUNXI_LOSC_CTRL_RTC_YMD_ACC bit is set and it will not
* be cleared until the real writing operation is finished
*/
if (sunxi_rtc_wait(chip, SUNXI_LOSC_CTRL,
SUNXI_LOSC_CTRL_RTC_YMD_ACC, 50)) {
dev_err(dev, "Failed to set rtc time.\n");
return -1;
}
msleep(2);
writel(date, chip->base + SUNXI_RTC_YMD);
/*
* After writing the RTC YY-MM-DD register, the
* SUNXI_LOSC_CTRL_RTC_YMD_ACC bit is set and it will not
* be cleared until the real writing operation is finished
*/
if (sunxi_rtc_wait(chip, SUNXI_LOSC_CTRL,
SUNXI_LOSC_CTRL_RTC_YMD_ACC, 50)) {
dev_err(dev, "Failed to set rtc time.\n");
return -1;
}
msleep(2);
return 0;
}
static int sunxi_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
{
struct sunxi_rtc_dev *chip = dev_get_drvdata(dev);
if (!enabled)
sunxi_rtc_setaie(enabled, chip);
return 0;
}
static const struct rtc_class_ops sunxi_rtc_ops = {
.read_time = sunxi_rtc_gettime,
.set_time = sunxi_rtc_settime,
.read_alarm = sunxi_rtc_getalarm,
.set_alarm = sunxi_rtc_setalarm,
.alarm_irq_enable = sunxi_rtc_alarm_irq_enable
};
static const struct of_device_id sunxi_rtc_dt_ids[] = {
{.compatible = "allwinner,sunxi-rtc", .data = &data_year_param},
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, sunxi_rtc_dt_ids);
static ssize_t sunxi_rtc_min_year_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct platform_device *pdev = container_of(dev, struct platform_device, dev);
struct sunxi_rtc_dev *rtc_dev = platform_get_drvdata(pdev);
return snprintf(buf, PAGE_SIZE, "%u \n", rtc_dev->data_year->min);
}
static struct device_attribute sunxi_rtc_min_year_attr =
__ATTR(min_year, S_IRUGO, sunxi_rtc_min_year_show, NULL);
static ssize_t sunxi_rtc_max_year_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct platform_device *pdev = container_of(dev, struct platform_device, dev);
struct sunxi_rtc_dev *rtc_dev = platform_get_drvdata(pdev);
return snprintf(buf, PAGE_SIZE, "%u \n", rtc_dev->data_year->max);
}
static struct device_attribute sunxi_rtc_max_year_attr =
__ATTR(max_year, S_IRUGO, sunxi_rtc_max_year_show, NULL);
#ifdef CONFIG_SUNXI_BOOTUP_EXTEND
static int rtc_set_bootreason_flag(u32 value)
{
if ((value & 0xffff) >= SUNXI_RTC_BOOT_REASON_MAX) {
pr_err("invalid reason\n");
return -1;
}
do {
writel(value, boot_reasonbase);
} while (readl(boot_reasonbase) != value);
return 0;
}
static int rtc_get_bootreason_flag(void)
{
u32 value;
value = readl(boot_reasonbase);
return (value & 0xffff);
}
static int sunxi_rtc_set_bootreason_hot_reboot(void)
{
rtc_set_bootreason_flag(SUNXI_RTC_BOOT_REASON_HOT_REBOOT);
return 0;
}
static int sunxi_rtc_bootreason_init(void)
{
unsigned int bootreason = 0;
bootreason = rtc_get_bootreason_flag();
/*
* reason | 0x80000000 to mark uboot fixed bootreason
* then kernel will not fix it again
*/
if ((bootreason & 0xffff) == SUNXI_RTC_BOOT_REASON_NONE) {
/* none --> cold */
pr_info("fix to cold boot, save boot reason\n");
rtc_set_bootreason_flag(SUNXI_RTC_BOOT_REASON_COLD_BOOT | 0x80000000);
} else if ((bootreason & 0xffff) == SUNXI_RTC_BOOT_REASON_COLD_BOOT) {
/* cold --> hot */
pr_info("fix to hot reboot, save boot reason\n");
rtc_set_bootreason_flag(SUNXI_RTC_BOOT_REASON_HOT_REBOOT | 0x80000000);
} else if ((bootreason & 0xffff) < SUNXI_RTC_BOOT_REASON_MAX) {
/* others, remain */
pr_info("fix to hot reboot, save boot reason\n");
rtc_set_bootreason_flag(bootreason | 0x80000000);
} else {
/* error --> hot */
pr_info("reason large than max, fix to hot reboot, save boot reason\n");
rtc_set_bootreason_flag(SUNXI_RTC_BOOT_REASON_HOT_REBOOT | 0x80000000);
}
bootreason = rtc_get_bootreason_flag();
return 0;
}
static int rtc_flag_str2num(const char *rtc_str, unsigned int *rtc_flag_p)
{
int ret = 0;
unsigned int rtc_flag;
if (!strcmp(rtc_str, "debug")) {
rtc_flag = SUNXI_DEBUG_MODE_FLAG;
} else if (!strcmp(rtc_str, "efex")) {
rtc_flag = SUNXI_EFEX_CMD_FLAG;
} else if (!strcmp(rtc_str, "boot-resignature")) {
rtc_flag = SUNXI_BOOT_RESIGNATURE_FLAG;
} else if (!strcmp(rtc_str, "recovery")
|| !strcmp(rtc_str, "boot-recovery")) {
rtc_flag = SUNXI_BOOT_RECOVERY_FLAG;
} else if (!strcmp(rtc_str, "sysrecovery")) {
rtc_flag = SUNXI_SYS_RECOVERY_FLAG;
} else if (!strcmp(rtc_str, "bootloader")) {
rtc_flag = SUNXI_FASTBOOT_FLAG;
} else if (!strcmp(rtc_str, "usb-recovery")) {
rtc_flag = SUNXI_USB_RECOVERY_FLAG;
} else if (!strcmp(rtc_str, "uboot")) {
rtc_flag = SUNXI_UBOOT_FLAG;
} else {
rtc_flag = 0;
ret = -1;
}
*rtc_flag_p = rtc_flag;
return ret;
}
static int sunxi_reboot_callback(struct notifier_block *this,
unsigned long code, void *data)
{
unsigned int rtc_flag = 0;
int ret;
if (data == NULL)
return NOTIFY_DONE;
pr_info("sunxi rtc reboot, arg %s\n", (char *)data);
ret = rtc_flag_str2num((char *)data, &rtc_flag);
if (ret == -1) {
pr_warn("unkown reboot arg %s", (char *)data);
return NOTIFY_DONE;
}
/*write the data to reg*/
writel(rtc_flag, global_pgregbase);
sunxi_rtc_set_bootreason_hot_reboot();
return NOTIFY_DONE;
}
static struct notifier_block sunxi_reboot_notifier = {
.notifier_call = sunxi_reboot_callback,
};
static ssize_t sunxi_rtc_flag_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
unsigned int rtc_flag = 0;
rtc_flag = readl(global_pgregbase);
return sprintf(buf, "0x%x\n", rtc_flag);
}
static ssize_t sunxi_rtc_flag_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t size)
{
unsigned int rtc_flag = 0;
int ret;
char rtc_str[30] = {0};
if (size >= 30) {
pr_err("parameters too long\n");
return size;
}
snprintf(rtc_str, size, "%s", buf);
ret = rtc_flag_str2num(rtc_str, &rtc_flag);
if (ret == -1)
pr_warn("unknown arg %s", buf);
else
pr_info("store rtc flag 0x%x\n", rtc_flag);
/* write the data to reg */
writel(rtc_flag, global_pgregbase);
return size;
}
static struct device_attribute sunxi_rtc_flag_attr =
__ATTR(flag, 0664, sunxi_rtc_flag_show, sunxi_rtc_flag_store);
static ssize_t sunxi_rtc_bootreason_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
unsigned int rtc_bootreason = 0;
rtc_bootreason = rtc_get_bootreason_flag();
return sprintf(buf, "0x%x\n", rtc_bootreason);
}
static ssize_t sunxi_rtc_bootreason_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t size)
{
unsigned int rtc_bootreason = 0;
int ret;
char rtc_str[30] = {0};
if (size >= 30) {
pr_err("parameters too long\n");
return size;
}
snprintf(rtc_str, size, "%s", buf);
ret = kstrtoul(rtc_str, 0, (unsigned long *)&rtc_bootreason);
if (ret >= SUNXI_RTC_BOOT_REASON_MAX)
pr_warn("unknown reason %s", buf);
else
pr_info("store rtc reason 0x%x\n", rtc_bootreason);
/* write the data to reg */
writel(rtc_bootreason, boot_reasonbase);
return size;
}
static struct device_attribute sunxi_rtc_bootreason_attr =
__ATTR(bootreason, 0664, sunxi_rtc_bootreason_show, sunxi_rtc_bootreason_store);
#endif
static int sunxi_rtc_probe(struct platform_device *pdev)
{
struct sunxi_rtc_dev *chip;
struct resource *res;
const struct of_device_id *of_id;
int ret;
unsigned int tmp_data;
#ifdef CONFIG_SUNXI_BOOTUP_EXTEND
u32 gpr_offset = 0;
u32 gpr_len = 0;
u32 gpr_num = 0;
u32 gpr_bootcount = 0;
#endif
global_pgregbase = NULL;
boot_reasonbase = NULL;
of_id = of_match_device(sunxi_rtc_dt_ids, &pdev->dev);
if (!of_id) {
dev_err(&pdev->dev, "Unable to setup RTC data\n");
return -ENODEV;
}
chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
if (!chip)
return -ENOMEM;
platform_set_drvdata(pdev, chip);
chip->dev = &pdev->dev;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
chip->base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(chip->base))
return PTR_ERR(chip->base);
/* Enable the clock/module so that we can access the registers */
pm_runtime_enable(&pdev->dev);
pm_runtime_get_sync(&pdev->dev);
chip->data_year = (struct sunxi_rtc_data_year *) of_id->data;
chip->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(chip->clk))
goto no_clk;
ret = clk_prepare_enable(chip->clk);
if (ret)
goto fail;
no_clk:
#ifdef CONFIG_RTC_SHUTDOWN_ALARM
sunxi_rtc_alarm_in_boot(chip);
#else
/*
* to support RTC shutdown alarm, we should not clear alarm for android
* will restart in charge mode.
* alarm will be cleared by android in normal start mode.
*/
/* clear the alarm count value */
#ifdef SUNXI_ALARM1_USED
writel(0, chip->base + SUNXI_ALRM_DHMS);
if (sunxi_rtc_wait(chip, SUNXI_LOSC_CTRL,
SUNXI_LOSC_CTRL_RTC_ALARM_ACC, 50)) {
dev_err(dev, "Failed to set rtc alarm1.\n");
return -1;
}
udelay(100);
#else
writel(0, chip->base + SUNXI_ALRM_COUNTER);
#endif
#ifdef SUNXI_RTC_COMP_CTRL
tmp_data = readl(chip->base + SUNXI_RTC_COMP_CTRL);
tmp_data |= SUNXI_COMP_ENABLE;
tmp_data &= ~(SUNXI_ADC_VDD_ON_DISABLE);
writel(tmp_data, chip->base + SUNXI_RTC_COMP_CTRL);
#endif
/* disable alarm, not generate irq pending */
writel(0, chip->base + SUNXI_ALRM_EN);
/* disable alarm week/cnt irq, unset to cpu */
writel(0, chip->base + SUNXI_ALRM_IRQ_EN);
/* clear alarm week/cnt irq pending */
writel(SUNXI_ALRM_IRQ_STA_CNT_IRQ_PEND, chip->base +
SUNXI_ALRM_IRQ_STA);
#endif
/* clear alarm wakeup output */
writel(SUNXI_ALRM_WAKEUP_OUTPUT_EN, chip->base +
SUNXI_ALARM_CONFIG);
if (!of_property_read_bool(pdev->dev.of_node, "auto_switch")) {
/*
* Step1: select RTC clock source
*/
tmp_data = readl(chip->base + SUNXI_LOSC_CTRL);
tmp_data &= (~REG_CLK32K_AUTO_SWT_EN);
/* Disable auto switch function */
tmp_data |= REG_CLK32K_AUTO_SWT_BYPASS;
writel(tmp_data, chip->base + SUNXI_LOSC_CTRL);
tmp_data = readl(chip->base + SUNXI_LOSC_CTRL);
tmp_data |= (RTC_SOURCE_EXTERNAL | REG_LOSCCTRL_MAGIC);
writel(tmp_data, chip->base + SUNXI_LOSC_CTRL);
/*
* in some old platform,we nend set GSM to fix some bug
* with external 32k, but in new platform,wo don't recommand
* to set this anymore, if some old platform have some problem
* with external 32k, please set this.
*/
/* We need to set GSM after change clock source */
/*
* udelay(10);
* tmp_data = readl(chip->base + SUNXI_LOSC_CTRL);
* tmp_data |= (EXT_LOSC_GSM | REG_LOSCCTRL_MAGIC);
* writel(tmp_data, chip->base + SUNXI_LOSC_CTRL);
*/
} else {
/* enable auto switch function manual
* because of in some case,we boot with auto switch function disable,
* and want to reboot to enable the auto switch function,
* but the rtc default value does not change unless vcc-rtc disable
* so we should not depend on the default value of reg.
*/
tmp_data = readl(chip->base + SUNXI_LOSC_CTRL);
tmp_data &= (~REG_CLK32K_AUTO_SWT_BYPASS);
tmp_data |= REG_CLK32K_AUTO_SWT_EN;
tmp_data |= (RTC_SOURCE_EXTERNAL | REG_LOSCCTRL_MAGIC);
writel(tmp_data, chip->base + SUNXI_LOSC_CTRL);
if (readl(chip->base + SUNXI_RTC_EXT_LOSC_STA_REG)
& SUNXI_RTC_EXT_STA_MASK) {
#ifdef SUNXI_RTC_CALI_REG
/* enable cali for 32k */
tmp_data = readl(chip->base + SUNXI_RTC_CALI_REG);
tmp_data |= (REG_CLK32K_CALI_FUNC_EN | REG_CLK32K_CALI_EN);
writel(tmp_data, chip->base + SUNXI_RTC_CALI_REG);
/* set cail ctrl value */
writel(CALI_CTRL_VALUE, chip->base + SUNXI_RTC_CALI_CTRL_REG);
#ifdef SUNXI_RTC_VDD_REG
tmp_data = readl(chip->base + SUNXI_RTC_VDD_REG);
tmp_data |= REG_V_SEL;
writel(tmp_data, chip->base + SUNXI_RTC_VDD_REG);
#endif
#endif
}
}
chip->irq = platform_get_irq(pdev, 0);
if (chip->irq < 0) {
dev_err(&pdev->dev, "No IRQ resource\n");
goto fail;
}
if (of_property_read_bool(pdev->dev.of_node, "wakeup-source")) {
device_init_wakeup(&pdev->dev, true);
dev_pm_set_wake_irq(&pdev->dev, chip->irq);
}
chip->rtc = devm_rtc_device_register(&pdev->dev, "sunxi-rtc",
&sunxi_rtc_ops, THIS_MODULE);
if (IS_ERR(chip->rtc)) {
dev_err(&pdev->dev, "unable to register device\n");
goto fail;
}
ret = devm_request_irq(&pdev->dev, chip->irq, sunxi_rtc_alarmirq,
0, dev_name(&pdev->dev), chip);
if (ret) {
dev_err(&pdev->dev, "Could not request IRQ\n");
goto fail;
}
dev_info(&pdev->dev, "RTC enabled\n");
device_create_file(&pdev->dev, &sunxi_rtc_min_year_attr);
device_create_file(&pdev->dev, &sunxi_rtc_max_year_attr);
#ifdef CONFIG_SUNXI_BOOTUP_EXTEND
ret = of_property_read_u32(pdev->dev.of_node,
"gpr_offset", &gpr_offset);
if (ret) {
dev_err(&pdev->dev, "Could not get Gpr offset\n");
goto fail_3;
}
ret = of_property_read_u32(pdev->dev.of_node,
"gpr_len", &gpr_len);
if (ret) {
dev_err(&pdev->dev, "Could not get Gpr len\n");
goto fail_3;
}
ret = of_property_read_u32(pdev->dev.of_node,
"gpr_cur_pos", &gpr_num);
if (ret) {
dev_err(&pdev->dev, "Could not get Gpr reboot cur pos");
goto fail_3;
}
ret = of_property_read_u32(pdev->dev.of_node,
"gpr_bootcount_pos", &gpr_bootcount);
if (ret)
gpr_bootcount = 0;
if (gpr_num >= gpr_len || gpr_bootcount >= gpr_len) {
dev_err(&pdev->dev,
"gpr_cur_pos is out of range!\n");
goto fail_3;
}
/*
* This notification function is for monitoring reboot command
* when the system has been started, the reboot parameter is
* stored in the RTC General Purpose register.
*
* gpr_offset: General Purpose register's offset
* gpr_len: The number of General Purpose registers
* gpr_cur_pos: which to store the parameter in
* General Purpose register
*/
ret = register_reboot_notifier(&sunxi_reboot_notifier);
if (ret) {
dev_err(&pdev->dev,
"register reboot notifier error %d\n", ret);
goto fail_3;
}
/*
* Export sunxi rtc flag to sysfs:
* To support "reboot efex" with RTC, we need to store a flag
* in RTC before reboot. Android's reboot can pass parameters to
* kernel but busybox's reboot can not do that.
* Here we export rtc flag to sysfs, so the flowing command can
* be used as an alternative of "reboot efex":
* echo "efex" > "/sys/devices/platform/soc/rtc/flag"; reboot
*/
ret = device_create_file(&pdev->dev, &sunxi_rtc_flag_attr);
if (ret) {
dev_err(&pdev->dev, "device_create_file failed\n");
goto fail_3;
}
global_pgregbase = chip->base + gpr_offset + 0x4 * gpr_num;
ret = device_create_file(&pdev->dev, &sunxi_rtc_bootreason_attr);
if (ret) {
dev_err(&pdev->dev, "device_create_file failed\n");
goto fail_4;
}
boot_reasonbase = chip->base + gpr_offset + 0x4 * gpr_bootcount;
sunxi_rtc_bootreason_init();
return 0;
fail_4:
device_remove_file(&pdev->dev, &sunxi_rtc_flag_attr);
fail_3:
device_remove_file(&pdev->dev, &sunxi_rtc_min_year_attr);
device_remove_file(&pdev->dev, &sunxi_rtc_max_year_attr);
devm_free_irq(&pdev->dev, chip->irq, chip);
if (!IS_ERR(chip->clk))
clk_disable_unprepare(chip->clk);
#else
return 0;
#endif
fail:
pm_runtime_put_sync(&pdev->dev);
pm_runtime_disable(&pdev->dev);
return -EIO;
}
static int sunxi_rtc_remove(struct platform_device *pdev)
{
struct sunxi_rtc_dev *chip = platform_get_drvdata(pdev);
#ifdef CONFIG_SUNXI_BOOTUP_EXTEND
unregister_reboot_notifier(&sunxi_reboot_notifier);
device_remove_file(&pdev->dev, &sunxi_rtc_flag_attr);
device_remove_file(&pdev->dev, &sunxi_rtc_bootreason_attr);
#endif
device_remove_file(&pdev->dev, &sunxi_rtc_min_year_attr);
device_remove_file(&pdev->dev, &sunxi_rtc_max_year_attr);
devm_rtc_device_unregister(chip->dev, chip->rtc);
/* Disable the clock/module */
pm_runtime_put_sync(&pdev->dev);
pm_runtime_disable(&pdev->dev);
return 0;
}
static void sunxi_rtc_shutdown(struct platform_device *pdev)
{
#ifdef SUNXI_RTC_COMP_CTRL
u32 tmp_val;
struct sunxi_rtc_dev *chip = platform_get_drvdata(pdev);
tmp_val = readl(chip->base + SUNXI_RTC_COMP_CTRL);
tmp_val &= ~(SUNXI_COMP_ENABLE);
tmp_val |= SUNXI_ADC_VDD_ON_DISABLE;
writel(tmp_val, chip->base + SUNXI_RTC_COMP_CTRL);
#endif
}
#ifdef CONFIG_PM_SLEEP
/* timer use to wait rec reg sync when wakeup */
struct hrtimer rtc_sync_timer;
static enum hrtimer_restart rtc_hrtimer_trig_handler(struct hrtimer *timer)
{
atomic_dec(&rtc_sync_flag);
return HRTIMER_NORESTART;
}
static int sunxi_rtc_suspend(struct device *dev)
{
atomic_inc(&rtc_sync_flag);
return 0;
}
static int sunxi_rtc_resume(struct device *dev)
{
hrtimer_init(&rtc_sync_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
rtc_sync_timer.function = rtc_hrtimer_trig_handler;
hrtimer_start(&rtc_sync_timer, ms_to_ktime(500), HRTIMER_MODE_REL);
return 0;
}
const struct dev_pm_ops sunxi_rtc_pm_ops = {
.suspend = sunxi_rtc_suspend,
.resume = sunxi_rtc_resume,
};
#else
const struct dev_pm_ops sunxi_rtc_pm_ops = {
.suspend = NULL,
.resume = NULL,
};
#endif
static struct platform_driver sunxi_rtc_driver = {
.probe = sunxi_rtc_probe,
.remove = sunxi_rtc_remove,
.shutdown = sunxi_rtc_shutdown,
.driver = {
.name = "sunxi-rtc",
.pm = &sunxi_rtc_pm_ops,
.of_match_table = sunxi_rtc_dt_ids,
},
};
module_platform_driver(sunxi_rtc_driver);
MODULE_DESCRIPTION("sunxi RTC driver");
MODULE_AUTHOR("Carlo Caione <carlo.caione@gmail.com>");
MODULE_LICENSE("GPL");
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