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268 lines
7.4 KiB
268 lines
7.4 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* drivers/rtc/rtc-vt8500.c |
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* |
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* Copyright (C) 2010 Alexey Charkov <[email protected]> |
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* |
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* Based on rtc-pxa.c |
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*/ |
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#include <linux/module.h> |
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#include <linux/rtc.h> |
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#include <linux/init.h> |
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#include <linux/interrupt.h> |
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#include <linux/io.h> |
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#include <linux/bcd.h> |
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#include <linux/platform_device.h> |
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#include <linux/slab.h> |
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#include <linux/of.h> |
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/* |
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* Register definitions |
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*/ |
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#define VT8500_RTC_TS 0x00 /* Time set */ |
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#define VT8500_RTC_DS 0x04 /* Date set */ |
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#define VT8500_RTC_AS 0x08 /* Alarm set */ |
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#define VT8500_RTC_CR 0x0c /* Control */ |
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#define VT8500_RTC_TR 0x10 /* Time read */ |
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#define VT8500_RTC_DR 0x14 /* Date read */ |
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#define VT8500_RTC_WS 0x18 /* Write status */ |
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#define VT8500_RTC_CL 0x20 /* Calibration */ |
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#define VT8500_RTC_IS 0x24 /* Interrupt status */ |
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#define VT8500_RTC_ST 0x28 /* Status */ |
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#define INVALID_TIME_BIT (1 << 31) |
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#define DATE_CENTURY_S 19 |
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#define DATE_YEAR_S 11 |
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#define DATE_YEAR_MASK (0xff << DATE_YEAR_S) |
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#define DATE_MONTH_S 6 |
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#define DATE_MONTH_MASK (0x1f << DATE_MONTH_S) |
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#define DATE_DAY_MASK 0x3f |
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#define TIME_DOW_S 20 |
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#define TIME_DOW_MASK (0x07 << TIME_DOW_S) |
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#define TIME_HOUR_S 14 |
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#define TIME_HOUR_MASK (0x3f << TIME_HOUR_S) |
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#define TIME_MIN_S 7 |
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#define TIME_MIN_MASK (0x7f << TIME_MIN_S) |
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#define TIME_SEC_MASK 0x7f |
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#define ALARM_DAY_S 20 |
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#define ALARM_DAY_MASK (0x3f << ALARM_DAY_S) |
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#define ALARM_DAY_BIT (1 << 29) |
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#define ALARM_HOUR_BIT (1 << 28) |
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#define ALARM_MIN_BIT (1 << 27) |
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#define ALARM_SEC_BIT (1 << 26) |
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#define ALARM_ENABLE_MASK (ALARM_DAY_BIT \ |
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| ALARM_HOUR_BIT \ |
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| ALARM_MIN_BIT \ |
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| ALARM_SEC_BIT) |
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#define VT8500_RTC_CR_ENABLE (1 << 0) /* Enable RTC */ |
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#define VT8500_RTC_CR_12H (1 << 1) /* 12h time format */ |
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#define VT8500_RTC_CR_SM_ENABLE (1 << 2) /* Enable periodic irqs */ |
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#define VT8500_RTC_CR_SM_SEC (1 << 3) /* 0: 1Hz/60, 1: 1Hz */ |
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#define VT8500_RTC_CR_CALIB (1 << 4) /* Enable calibration */ |
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#define VT8500_RTC_IS_ALARM (1 << 0) /* Alarm interrupt status */ |
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struct vt8500_rtc { |
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void __iomem *regbase; |
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int irq_alarm; |
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struct rtc_device *rtc; |
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spinlock_t lock; /* Protects this structure */ |
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}; |
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static irqreturn_t vt8500_rtc_irq(int irq, void *dev_id) |
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{ |
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struct vt8500_rtc *vt8500_rtc = dev_id; |
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u32 isr; |
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unsigned long events = 0; |
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spin_lock(&vt8500_rtc->lock); |
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/* clear interrupt sources */ |
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isr = readl(vt8500_rtc->regbase + VT8500_RTC_IS); |
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writel(isr, vt8500_rtc->regbase + VT8500_RTC_IS); |
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spin_unlock(&vt8500_rtc->lock); |
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if (isr & VT8500_RTC_IS_ALARM) |
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events |= RTC_AF | RTC_IRQF; |
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rtc_update_irq(vt8500_rtc->rtc, 1, events); |
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return IRQ_HANDLED; |
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} |
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static int vt8500_rtc_read_time(struct device *dev, struct rtc_time *tm) |
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{ |
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struct vt8500_rtc *vt8500_rtc = dev_get_drvdata(dev); |
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u32 date, time; |
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date = readl(vt8500_rtc->regbase + VT8500_RTC_DR); |
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time = readl(vt8500_rtc->regbase + VT8500_RTC_TR); |
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tm->tm_sec = bcd2bin(time & TIME_SEC_MASK); |
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tm->tm_min = bcd2bin((time & TIME_MIN_MASK) >> TIME_MIN_S); |
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tm->tm_hour = bcd2bin((time & TIME_HOUR_MASK) >> TIME_HOUR_S); |
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tm->tm_mday = bcd2bin(date & DATE_DAY_MASK); |
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tm->tm_mon = bcd2bin((date & DATE_MONTH_MASK) >> DATE_MONTH_S) - 1; |
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tm->tm_year = bcd2bin((date & DATE_YEAR_MASK) >> DATE_YEAR_S) |
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+ ((date >> DATE_CENTURY_S) & 1 ? 200 : 100); |
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tm->tm_wday = (time & TIME_DOW_MASK) >> TIME_DOW_S; |
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return 0; |
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} |
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static int vt8500_rtc_set_time(struct device *dev, struct rtc_time *tm) |
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{ |
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struct vt8500_rtc *vt8500_rtc = dev_get_drvdata(dev); |
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writel((bin2bcd(tm->tm_year % 100) << DATE_YEAR_S) |
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| (bin2bcd(tm->tm_mon + 1) << DATE_MONTH_S) |
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| (bin2bcd(tm->tm_mday)) |
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| ((tm->tm_year >= 200) << DATE_CENTURY_S), |
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vt8500_rtc->regbase + VT8500_RTC_DS); |
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writel((bin2bcd(tm->tm_wday) << TIME_DOW_S) |
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| (bin2bcd(tm->tm_hour) << TIME_HOUR_S) |
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| (bin2bcd(tm->tm_min) << TIME_MIN_S) |
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| (bin2bcd(tm->tm_sec)), |
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vt8500_rtc->regbase + VT8500_RTC_TS); |
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return 0; |
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} |
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static int vt8500_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) |
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{ |
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struct vt8500_rtc *vt8500_rtc = dev_get_drvdata(dev); |
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u32 isr, alarm; |
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alarm = readl(vt8500_rtc->regbase + VT8500_RTC_AS); |
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isr = readl(vt8500_rtc->regbase + VT8500_RTC_IS); |
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alrm->time.tm_mday = bcd2bin((alarm & ALARM_DAY_MASK) >> ALARM_DAY_S); |
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alrm->time.tm_hour = bcd2bin((alarm & TIME_HOUR_MASK) >> TIME_HOUR_S); |
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alrm->time.tm_min = bcd2bin((alarm & TIME_MIN_MASK) >> TIME_MIN_S); |
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alrm->time.tm_sec = bcd2bin((alarm & TIME_SEC_MASK)); |
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alrm->enabled = (alarm & ALARM_ENABLE_MASK) ? 1 : 0; |
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alrm->pending = (isr & VT8500_RTC_IS_ALARM) ? 1 : 0; |
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return rtc_valid_tm(&alrm->time); |
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} |
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static int vt8500_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) |
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{ |
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struct vt8500_rtc *vt8500_rtc = dev_get_drvdata(dev); |
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writel((alrm->enabled ? ALARM_ENABLE_MASK : 0) |
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| (bin2bcd(alrm->time.tm_mday) << ALARM_DAY_S) |
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| (bin2bcd(alrm->time.tm_hour) << TIME_HOUR_S) |
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| (bin2bcd(alrm->time.tm_min) << TIME_MIN_S) |
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| (bin2bcd(alrm->time.tm_sec)), |
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vt8500_rtc->regbase + VT8500_RTC_AS); |
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return 0; |
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} |
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static int vt8500_alarm_irq_enable(struct device *dev, unsigned int enabled) |
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{ |
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struct vt8500_rtc *vt8500_rtc = dev_get_drvdata(dev); |
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unsigned long tmp = readl(vt8500_rtc->regbase + VT8500_RTC_AS); |
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if (enabled) |
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tmp |= ALARM_ENABLE_MASK; |
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else |
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tmp &= ~ALARM_ENABLE_MASK; |
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writel(tmp, vt8500_rtc->regbase + VT8500_RTC_AS); |
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return 0; |
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} |
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static const struct rtc_class_ops vt8500_rtc_ops = { |
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.read_time = vt8500_rtc_read_time, |
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.set_time = vt8500_rtc_set_time, |
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.read_alarm = vt8500_rtc_read_alarm, |
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.set_alarm = vt8500_rtc_set_alarm, |
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.alarm_irq_enable = vt8500_alarm_irq_enable, |
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}; |
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static int vt8500_rtc_probe(struct platform_device *pdev) |
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{ |
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struct vt8500_rtc *vt8500_rtc; |
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int ret; |
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vt8500_rtc = devm_kzalloc(&pdev->dev, |
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sizeof(struct vt8500_rtc), GFP_KERNEL); |
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if (!vt8500_rtc) |
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return -ENOMEM; |
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spin_lock_init(&vt8500_rtc->lock); |
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platform_set_drvdata(pdev, vt8500_rtc); |
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vt8500_rtc->irq_alarm = platform_get_irq(pdev, 0); |
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if (vt8500_rtc->irq_alarm < 0) |
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return vt8500_rtc->irq_alarm; |
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vt8500_rtc->regbase = devm_platform_ioremap_resource(pdev, 0); |
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if (IS_ERR(vt8500_rtc->regbase)) |
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return PTR_ERR(vt8500_rtc->regbase); |
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/* Enable RTC and set it to 24-hour mode */ |
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writel(VT8500_RTC_CR_ENABLE, |
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vt8500_rtc->regbase + VT8500_RTC_CR); |
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vt8500_rtc->rtc = devm_rtc_allocate_device(&pdev->dev); |
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if (IS_ERR(vt8500_rtc->rtc)) |
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return PTR_ERR(vt8500_rtc->rtc); |
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vt8500_rtc->rtc->ops = &vt8500_rtc_ops; |
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vt8500_rtc->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000; |
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vt8500_rtc->rtc->range_max = RTC_TIMESTAMP_END_2199; |
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ret = devm_request_irq(&pdev->dev, vt8500_rtc->irq_alarm, |
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vt8500_rtc_irq, 0, "rtc alarm", vt8500_rtc); |
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if (ret < 0) { |
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dev_err(&pdev->dev, "can't get irq %i, err %d\n", |
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vt8500_rtc->irq_alarm, ret); |
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return ret; |
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} |
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return devm_rtc_register_device(vt8500_rtc->rtc); |
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} |
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static int vt8500_rtc_remove(struct platform_device *pdev) |
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{ |
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struct vt8500_rtc *vt8500_rtc = platform_get_drvdata(pdev); |
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/* Disable alarm matching */ |
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writel(0, vt8500_rtc->regbase + VT8500_RTC_IS); |
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return 0; |
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} |
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static const struct of_device_id wmt_dt_ids[] = { |
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{ .compatible = "via,vt8500-rtc", }, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(of, wmt_dt_ids); |
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static struct platform_driver vt8500_rtc_driver = { |
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.probe = vt8500_rtc_probe, |
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.remove = vt8500_rtc_remove, |
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.driver = { |
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.name = "vt8500-rtc", |
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.of_match_table = wmt_dt_ids, |
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}, |
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}; |
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module_platform_driver(vt8500_rtc_driver); |
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MODULE_AUTHOR("Alexey Charkov <[email protected]>"); |
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MODULE_DESCRIPTION("VIA VT8500 SoC Realtime Clock Driver (RTC)"); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_ALIAS("platform:vt8500-rtc");
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