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/*
* An RTC driver for Allwinner A10/A20
*
* 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.
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#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/rtc.h>
#include <linux/types.h>
#define SUNXI_LOSC_CTRL 0x0000
#define SUNXI_LOSC_CTRL_RTC_HMS_ACC BIT(8)
#define SUNXI_LOSC_CTRL_RTC_YMD_ACC BIT(7)
#define SUNXI_RTC_YMD 0x0004
#define SUNXI_RTC_HMS 0x0008
#define SUNXI_ALRM_DHMS 0x000c
#define SUNXI_ALRM_EN 0x0014
#define SUNXI_ALRM_EN_CNT_EN BIT(8)
#define SUNXI_ALRM_IRQ_EN 0x0018
#define SUNXI_ALRM_IRQ_EN_CNT_IRQ_EN BIT(0)
#define SUNXI_ALRM_IRQ_STA 0x001c
#define SUNXI_ALRM_IRQ_STA_CNT_IRQ_PEND BIT(0)
#define SUNXI_MASK_DH 0x0000001f
#define SUNXI_MASK_SM 0x0000003f
#define SUNXI_MASK_M 0x0000000f
#define SUNXI_MASK_LY 0x00000001
#define SUNXI_MASK_D 0x00000ffe
#define SUNXI_MASK_M 0x0000000f
#define SUNXI_GET(x, mask, shift) (((x) & ((mask) << (shift))) \
>> (shift))
#define SUNXI_SET(x, mask, shift) (((x) & (mask)) << (shift))
/*
* Get date values
*/
#define SUNXI_DATE_GET_DAY_VALUE(x) SUNXI_GET(x, SUNXI_MASK_DH, 0)
#define SUNXI_DATE_GET_MON_VALUE(x) SUNXI_GET(x, SUNXI_MASK_M, 8)
#define SUNXI_DATE_GET_YEAR_VALUE(x, mask) SUNXI_GET(x, mask, 16)
/*
* Get time values
*/
#define SUNXI_TIME_GET_SEC_VALUE(x) SUNXI_GET(x, SUNXI_MASK_SM, 0)
#define SUNXI_TIME_GET_MIN_VALUE(x) SUNXI_GET(x, SUNXI_MASK_SM, 8)
#define SUNXI_TIME_GET_HOUR_VALUE(x) SUNXI_GET(x, SUNXI_MASK_DH, 16)
/*
* Get alarm values
*/
#define SUNXI_ALRM_GET_SEC_VALUE(x) SUNXI_GET(x, SUNXI_MASK_SM, 0)
#define SUNXI_ALRM_GET_MIN_VALUE(x) SUNXI_GET(x, SUNXI_MASK_SM, 8)
#define SUNXI_ALRM_GET_HOUR_VALUE(x) SUNXI_GET(x, SUNXI_MASK_DH, 16)
/*
* Set date values
*/
#define SUNXI_DATE_SET_DAY_VALUE(x) SUNXI_DATE_GET_DAY_VALUE(x)
#define SUNXI_DATE_SET_MON_VALUE(x) SUNXI_SET(x, SUNXI_MASK_M, 8)
#define SUNXI_DATE_SET_YEAR_VALUE(x, mask) SUNXI_SET(x, mask, 16)
#define SUNXI_LEAP_SET_VALUE(x, shift) SUNXI_SET(x, SUNXI_MASK_LY, shift)
/*
* Set time values
*/
#define SUNXI_TIME_SET_SEC_VALUE(x) SUNXI_TIME_GET_SEC_VALUE(x)
#define SUNXI_TIME_SET_MIN_VALUE(x) SUNXI_SET(x, SUNXI_MASK_SM, 8)
#define SUNXI_TIME_SET_HOUR_VALUE(x) SUNXI_SET(x, SUNXI_MASK_DH, 16)
/*
* Set alarm values
*/
#define SUNXI_ALRM_SET_SEC_VALUE(x) SUNXI_ALRM_GET_SEC_VALUE(x)
#define SUNXI_ALRM_SET_MIN_VALUE(x) SUNXI_SET(x, SUNXI_MASK_SM, 8)
#define SUNXI_ALRM_SET_HOUR_VALUE(x) SUNXI_SET(x, SUNXI_MASK_DH, 16)
#define SUNXI_ALRM_SET_DAY_VALUE(x) SUNXI_SET(x, SUNXI_MASK_D, 21)
/*
* Time unit conversions
*/
#define SEC_IN_MIN 60
#define SEC_IN_HOUR (60 * SEC_IN_MIN)
#define SEC_IN_DAY (24 * SEC_IN_HOUR)
/*
* The year parameter passed to the driver is usually an offset relative to
* the year 1900. This macro is used to convert this offset to another one
* relative to the minimum year allowed by the hardware.
*/
#define SUNXI_YEAR_OFF(x) ((x)->min - 1900)
/*
* min and max year are arbitrary set considering the limited range of the
* hardware register field
*/
struct sunxi_rtc_data_year {
unsigned int min; /* min year allowed */
unsigned int max; /* max year allowed */
unsigned int mask; /* mask for the year field */
unsigned char leap_shift; /* bit shift to get the leap year */
};
static struct sunxi_rtc_data_year data_year_param[] = {
[0] = {
.min = 2010,
.max = 2073,
.mask = 0x3f,
.leap_shift = 22,
},
[1] = {
.min = 1970,
.max = 2225,
.mask = 0xff,
.leap_shift = 24,
},
};
struct sunxi_rtc_dev {
struct rtc_device *rtc;
struct device *dev;
struct sunxi_rtc_data_year *data_year;
void __iomem *base;
int irq;
};
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_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;
u32 alrm_en;
u32 date;
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->mask);
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);
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;
/*
* 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);
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->mask);
rtc_tm->tm_mon -= 1;
/*
* switch from (data_year->min)-relative offset to
* a (1900)-relative one
*/
rtc_tm->tm_year += SUNXI_YEAR_OFF(chip->data_year);
return rtc_valid_tm(rtc_tm);
}
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 = 0;
unsigned long time_now = 0;
unsigned long time_set = 0;
unsigned long time_gap = 0;
unsigned long time_gap_day = 0;
unsigned long time_gap_hour = 0;
unsigned long time_gap_min = 0;
int ret = 0;
ret = sunxi_rtc_gettime(dev, &tm_now);
if (ret < 0) {
dev_err(dev, "Error in getting time\n");
return -EINVAL;
}
rtc_tm_to_time(alrm_tm, &time_set);
rtc_tm_to_time(&tm_now, &time_now);
if (time_set <= time_now) {
dev_err(dev, "Date to set in the past\n");
return -EINVAL;
}
time_gap = time_set - time_now;
time_gap_day = time_gap / SEC_IN_DAY;
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
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