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Release 4.14 drivers/rtc/rtc-sunxi.c

Directory: drivers/rtc
/*
 * 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 const 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;
	
const 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; }

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static void sunxi_rtc_setaie(unsigned 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); }

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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; }

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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); }

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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; unsigned long time_gap_hour; unsigned long time_gap_min; 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 = 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 / SEC_IN_MIN; time_gap -= time_gap_min * SEC_IN_MIN; sunxi_rtc_setaie(0, chip); writel(0, chip->base + SUNXI_ALRM_DHMS); usleep_range(100, 300); 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); 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; }

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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; }

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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; unsigned int year; /* * 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 (year < chip->data_year->min || year > chip->data_year->max) { dev_err(dev, "rtc only supports year in range %u - %u\n", chip->data_year->min, chip->data_year->max); return -EINVAL; } rtc_tm->tm_year -= SUNXI_YEAR_OFF(chip->data_year); rtc_tm->tm_mon += 1; 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->mask); if (is_leap_year(year)) date |= SUNXI_LEAP_SET_VALUE(1, chip->data_year->leap_shift); 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); writel(0, chip->base + SUNXI_RTC_HMS); writel(0, chip->base + SUNXI_RTC_YMD); 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; } 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; } return 0; }

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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; }

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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,sun4i-a10-rtc", .data = &data_year_param[0] }, { .compatible = "allwinner,sun7i-a20-rtc", .data = &data_year_param[1] }, { /* sentinel */ }, }; MODULE_DEVICE_TABLE(of, sunxi_rtc_dt_ids);
static int sunxi_rtc_probe(struct platform_device *pdev) { struct sunxi_rtc_dev *chip; struct resource *res; int ret; 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); chip->irq = platform_get_irq(pdev, 0); if (chip->irq < 0) { dev_err(&pdev->dev, "No IRQ resource\n"); return chip->irq; } 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"); return ret; } chip->data_year = of_device_get_match_data(&pdev->dev); if (!chip->data_year) { dev_err(&pdev->dev, "Unable to setup RTC data\n"); return -ENODEV; } /* clear the alarm count value */ writel(0, chip->base + SUNXI_ALRM_DHMS); /* 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); chip->rtc = rtc_device_register("rtc-sunxi", &pdev->dev, &sunxi_rtc_ops, THIS_MODULE); if (IS_ERR(chip->rtc)) { dev_err(&pdev->dev, "unable to register device\n"); return PTR_ERR(chip->rtc); } dev_info(&pdev->dev, "RTC enabled\n"); return 0; }

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static int sunxi_rtc_remove(struct platform_device *pdev) { struct sunxi_rtc_dev *chip = platform_get_drvdata(pdev); rtc_device_unregister(chip->rtc); return 0; }

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static struct platform_driver sunxi_rtc_driver = { .probe = sunxi_rtc_probe, .remove = sunxi_rtc_remove, .driver = { .name = "sunxi-rtc", .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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Directory: drivers/rtc
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