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488 lines
13 KiB
488 lines
13 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* An RTC driver for Allwinner A10/A20 |
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* |
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* Copyright (c) 2013, Carlo Caione <[email protected]> |
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*/ |
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#include <linux/delay.h> |
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#include <linux/err.h> |
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#include <linux/fs.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/kernel.h> |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/of_address.h> |
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#include <linux/of_device.h> |
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#include <linux/platform_device.h> |
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#include <linux/rtc.h> |
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#include <linux/types.h> |
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#define SUNXI_LOSC_CTRL 0x0000 |
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#define SUNXI_LOSC_CTRL_RTC_HMS_ACC BIT(8) |
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#define SUNXI_LOSC_CTRL_RTC_YMD_ACC BIT(7) |
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#define SUNXI_RTC_YMD 0x0004 |
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#define SUNXI_RTC_HMS 0x0008 |
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#define SUNXI_ALRM_DHMS 0x000c |
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#define SUNXI_ALRM_EN 0x0014 |
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#define SUNXI_ALRM_EN_CNT_EN BIT(8) |
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#define SUNXI_ALRM_IRQ_EN 0x0018 |
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#define SUNXI_ALRM_IRQ_EN_CNT_IRQ_EN BIT(0) |
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#define SUNXI_ALRM_IRQ_STA 0x001c |
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#define SUNXI_ALRM_IRQ_STA_CNT_IRQ_PEND BIT(0) |
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#define SUNXI_MASK_DH 0x0000001f |
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#define SUNXI_MASK_SM 0x0000003f |
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#define SUNXI_MASK_M 0x0000000f |
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#define SUNXI_MASK_LY 0x00000001 |
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#define SUNXI_MASK_D 0x00000ffe |
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#define SUNXI_MASK_M 0x0000000f |
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#define SUNXI_GET(x, mask, shift) (((x) & ((mask) << (shift))) \ |
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>> (shift)) |
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#define SUNXI_SET(x, mask, shift) (((x) & (mask)) << (shift)) |
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/* |
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* Get date values |
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*/ |
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#define SUNXI_DATE_GET_DAY_VALUE(x) SUNXI_GET(x, SUNXI_MASK_DH, 0) |
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#define SUNXI_DATE_GET_MON_VALUE(x) SUNXI_GET(x, SUNXI_MASK_M, 8) |
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#define SUNXI_DATE_GET_YEAR_VALUE(x, mask) SUNXI_GET(x, mask, 16) |
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/* |
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* Get time values |
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*/ |
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#define SUNXI_TIME_GET_SEC_VALUE(x) SUNXI_GET(x, SUNXI_MASK_SM, 0) |
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#define SUNXI_TIME_GET_MIN_VALUE(x) SUNXI_GET(x, SUNXI_MASK_SM, 8) |
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#define SUNXI_TIME_GET_HOUR_VALUE(x) SUNXI_GET(x, SUNXI_MASK_DH, 16) |
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/* |
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* Get alarm values |
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*/ |
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#define SUNXI_ALRM_GET_SEC_VALUE(x) SUNXI_GET(x, SUNXI_MASK_SM, 0) |
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#define SUNXI_ALRM_GET_MIN_VALUE(x) SUNXI_GET(x, SUNXI_MASK_SM, 8) |
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#define SUNXI_ALRM_GET_HOUR_VALUE(x) SUNXI_GET(x, SUNXI_MASK_DH, 16) |
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/* |
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* Set date values |
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*/ |
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#define SUNXI_DATE_SET_DAY_VALUE(x) SUNXI_DATE_GET_DAY_VALUE(x) |
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#define SUNXI_DATE_SET_MON_VALUE(x) SUNXI_SET(x, SUNXI_MASK_M, 8) |
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#define SUNXI_DATE_SET_YEAR_VALUE(x, mask) SUNXI_SET(x, mask, 16) |
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#define SUNXI_LEAP_SET_VALUE(x, shift) SUNXI_SET(x, SUNXI_MASK_LY, shift) |
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/* |
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* Set time values |
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*/ |
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#define SUNXI_TIME_SET_SEC_VALUE(x) SUNXI_TIME_GET_SEC_VALUE(x) |
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#define SUNXI_TIME_SET_MIN_VALUE(x) SUNXI_SET(x, SUNXI_MASK_SM, 8) |
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#define SUNXI_TIME_SET_HOUR_VALUE(x) SUNXI_SET(x, SUNXI_MASK_DH, 16) |
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/* |
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* Set alarm values |
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*/ |
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#define SUNXI_ALRM_SET_SEC_VALUE(x) SUNXI_ALRM_GET_SEC_VALUE(x) |
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#define SUNXI_ALRM_SET_MIN_VALUE(x) SUNXI_SET(x, SUNXI_MASK_SM, 8) |
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#define SUNXI_ALRM_SET_HOUR_VALUE(x) SUNXI_SET(x, SUNXI_MASK_DH, 16) |
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#define SUNXI_ALRM_SET_DAY_VALUE(x) SUNXI_SET(x, SUNXI_MASK_D, 21) |
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/* |
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* Time unit conversions |
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*/ |
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#define SEC_IN_MIN 60 |
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#define SEC_IN_HOUR (60 * SEC_IN_MIN) |
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#define SEC_IN_DAY (24 * SEC_IN_HOUR) |
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/* |
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* The year parameter passed to the driver is usually an offset relative to |
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* the year 1900. This macro is used to convert this offset to another one |
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* relative to the minimum year allowed by the hardware. |
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*/ |
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#define SUNXI_YEAR_OFF(x) ((x)->min - 1900) |
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/* |
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* min and max year are arbitrary set considering the limited range of the |
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* hardware register field |
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*/ |
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struct sunxi_rtc_data_year { |
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unsigned int min; /* min year allowed */ |
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unsigned int max; /* max year allowed */ |
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unsigned int mask; /* mask for the year field */ |
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unsigned char leap_shift; /* bit shift to get the leap year */ |
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}; |
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static const struct sunxi_rtc_data_year data_year_param[] = { |
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[0] = { |
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.min = 2010, |
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.max = 2073, |
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.mask = 0x3f, |
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.leap_shift = 22, |
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}, |
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[1] = { |
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.min = 1970, |
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.max = 2225, |
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.mask = 0xff, |
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.leap_shift = 24, |
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}, |
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}; |
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struct sunxi_rtc_dev { |
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struct rtc_device *rtc; |
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struct device *dev; |
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const struct sunxi_rtc_data_year *data_year; |
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void __iomem *base; |
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int irq; |
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}; |
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static irqreturn_t sunxi_rtc_alarmirq(int irq, void *id) |
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{ |
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struct sunxi_rtc_dev *chip = (struct sunxi_rtc_dev *) id; |
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u32 val; |
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val = readl(chip->base + SUNXI_ALRM_IRQ_STA); |
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if (val & SUNXI_ALRM_IRQ_STA_CNT_IRQ_PEND) { |
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val |= SUNXI_ALRM_IRQ_STA_CNT_IRQ_PEND; |
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writel(val, chip->base + SUNXI_ALRM_IRQ_STA); |
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rtc_update_irq(chip->rtc, 1, RTC_AF | RTC_IRQF); |
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return IRQ_HANDLED; |
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} |
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return IRQ_NONE; |
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} |
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static void sunxi_rtc_setaie(unsigned int to, struct sunxi_rtc_dev *chip) |
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{ |
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u32 alrm_val = 0; |
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u32 alrm_irq_val = 0; |
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if (to) { |
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alrm_val = readl(chip->base + SUNXI_ALRM_EN); |
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alrm_val |= SUNXI_ALRM_EN_CNT_EN; |
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alrm_irq_val = readl(chip->base + SUNXI_ALRM_IRQ_EN); |
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alrm_irq_val |= SUNXI_ALRM_IRQ_EN_CNT_IRQ_EN; |
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} else { |
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writel(SUNXI_ALRM_IRQ_STA_CNT_IRQ_PEND, |
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chip->base + SUNXI_ALRM_IRQ_STA); |
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} |
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writel(alrm_val, chip->base + SUNXI_ALRM_EN); |
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writel(alrm_irq_val, chip->base + SUNXI_ALRM_IRQ_EN); |
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} |
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static int sunxi_rtc_getalarm(struct device *dev, struct rtc_wkalrm *wkalrm) |
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{ |
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struct sunxi_rtc_dev *chip = dev_get_drvdata(dev); |
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struct rtc_time *alrm_tm = &wkalrm->time; |
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u32 alrm; |
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u32 alrm_en; |
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u32 date; |
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alrm = readl(chip->base + SUNXI_ALRM_DHMS); |
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date = readl(chip->base + SUNXI_RTC_YMD); |
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alrm_tm->tm_sec = SUNXI_ALRM_GET_SEC_VALUE(alrm); |
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alrm_tm->tm_min = SUNXI_ALRM_GET_MIN_VALUE(alrm); |
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alrm_tm->tm_hour = SUNXI_ALRM_GET_HOUR_VALUE(alrm); |
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alrm_tm->tm_mday = SUNXI_DATE_GET_DAY_VALUE(date); |
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alrm_tm->tm_mon = SUNXI_DATE_GET_MON_VALUE(date); |
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alrm_tm->tm_year = SUNXI_DATE_GET_YEAR_VALUE(date, |
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chip->data_year->mask); |
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alrm_tm->tm_mon -= 1; |
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/* |
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* switch from (data_year->min)-relative offset to |
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* a (1900)-relative one |
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*/ |
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alrm_tm->tm_year += SUNXI_YEAR_OFF(chip->data_year); |
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alrm_en = readl(chip->base + SUNXI_ALRM_IRQ_EN); |
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if (alrm_en & SUNXI_ALRM_EN_CNT_EN) |
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wkalrm->enabled = 1; |
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return 0; |
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} |
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static int sunxi_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm) |
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{ |
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struct sunxi_rtc_dev *chip = dev_get_drvdata(dev); |
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u32 date, time; |
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/* |
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* read again in case it changes |
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*/ |
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do { |
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date = readl(chip->base + SUNXI_RTC_YMD); |
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time = readl(chip->base + SUNXI_RTC_HMS); |
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} while ((date != readl(chip->base + SUNXI_RTC_YMD)) || |
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(time != readl(chip->base + SUNXI_RTC_HMS))); |
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rtc_tm->tm_sec = SUNXI_TIME_GET_SEC_VALUE(time); |
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rtc_tm->tm_min = SUNXI_TIME_GET_MIN_VALUE(time); |
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rtc_tm->tm_hour = SUNXI_TIME_GET_HOUR_VALUE(time); |
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rtc_tm->tm_mday = SUNXI_DATE_GET_DAY_VALUE(date); |
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rtc_tm->tm_mon = SUNXI_DATE_GET_MON_VALUE(date); |
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rtc_tm->tm_year = SUNXI_DATE_GET_YEAR_VALUE(date, |
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chip->data_year->mask); |
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rtc_tm->tm_mon -= 1; |
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/* |
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* switch from (data_year->min)-relative offset to |
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* a (1900)-relative one |
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*/ |
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rtc_tm->tm_year += SUNXI_YEAR_OFF(chip->data_year); |
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return 0; |
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} |
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static int sunxi_rtc_setalarm(struct device *dev, struct rtc_wkalrm *wkalrm) |
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{ |
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struct sunxi_rtc_dev *chip = dev_get_drvdata(dev); |
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struct rtc_time *alrm_tm = &wkalrm->time; |
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struct rtc_time tm_now; |
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u32 alrm; |
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time64_t diff; |
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unsigned long time_gap; |
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unsigned long time_gap_day; |
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unsigned long time_gap_hour; |
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unsigned long time_gap_min; |
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int ret; |
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ret = sunxi_rtc_gettime(dev, &tm_now); |
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if (ret < 0) { |
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dev_err(dev, "Error in getting time\n"); |
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return -EINVAL; |
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} |
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diff = rtc_tm_sub(alrm_tm, &tm_now); |
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if (diff <= 0) { |
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dev_err(dev, "Date to set in the past\n"); |
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return -EINVAL; |
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} |
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if (diff > 255 * SEC_IN_DAY) { |
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dev_err(dev, "Day must be in the range 0 - 255\n"); |
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return -EINVAL; |
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} |
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time_gap = diff; |
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time_gap_day = time_gap / SEC_IN_DAY; |
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time_gap -= time_gap_day * SEC_IN_DAY; |
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time_gap_hour = time_gap / SEC_IN_HOUR; |
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time_gap -= time_gap_hour * SEC_IN_HOUR; |
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time_gap_min = time_gap / SEC_IN_MIN; |
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time_gap -= time_gap_min * SEC_IN_MIN; |
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sunxi_rtc_setaie(0, chip); |
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writel(0, chip->base + SUNXI_ALRM_DHMS); |
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usleep_range(100, 300); |
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alrm = SUNXI_ALRM_SET_SEC_VALUE(time_gap) | |
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SUNXI_ALRM_SET_MIN_VALUE(time_gap_min) | |
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SUNXI_ALRM_SET_HOUR_VALUE(time_gap_hour) | |
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SUNXI_ALRM_SET_DAY_VALUE(time_gap_day); |
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writel(alrm, chip->base + SUNXI_ALRM_DHMS); |
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writel(0, chip->base + SUNXI_ALRM_IRQ_EN); |
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writel(SUNXI_ALRM_IRQ_EN_CNT_IRQ_EN, chip->base + SUNXI_ALRM_IRQ_EN); |
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sunxi_rtc_setaie(wkalrm->enabled, chip); |
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return 0; |
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} |
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static int sunxi_rtc_wait(struct sunxi_rtc_dev *chip, int offset, |
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unsigned int mask, unsigned int ms_timeout) |
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{ |
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const unsigned long timeout = jiffies + msecs_to_jiffies(ms_timeout); |
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u32 reg; |
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do { |
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reg = readl(chip->base + offset); |
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reg &= mask; |
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if (reg == mask) |
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return 0; |
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} while (time_before(jiffies, timeout)); |
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return -ETIMEDOUT; |
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} |
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static int sunxi_rtc_settime(struct device *dev, struct rtc_time *rtc_tm) |
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{ |
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struct sunxi_rtc_dev *chip = dev_get_drvdata(dev); |
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u32 date = 0; |
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u32 time = 0; |
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unsigned int year; |
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/* |
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* the input rtc_tm->tm_year is the offset relative to 1900. We use |
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* the SUNXI_YEAR_OFF macro to rebase it with respect to the min year |
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* allowed by the hardware |
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*/ |
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year = rtc_tm->tm_year + 1900; |
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if (year < chip->data_year->min || year > chip->data_year->max) { |
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dev_err(dev, "rtc only supports year in range %u - %u\n", |
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chip->data_year->min, chip->data_year->max); |
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return -EINVAL; |
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} |
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rtc_tm->tm_year -= SUNXI_YEAR_OFF(chip->data_year); |
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rtc_tm->tm_mon += 1; |
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date = SUNXI_DATE_SET_DAY_VALUE(rtc_tm->tm_mday) | |
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SUNXI_DATE_SET_MON_VALUE(rtc_tm->tm_mon) | |
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SUNXI_DATE_SET_YEAR_VALUE(rtc_tm->tm_year, |
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chip->data_year->mask); |
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if (is_leap_year(year)) |
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date |= SUNXI_LEAP_SET_VALUE(1, chip->data_year->leap_shift); |
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time = SUNXI_TIME_SET_SEC_VALUE(rtc_tm->tm_sec) | |
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SUNXI_TIME_SET_MIN_VALUE(rtc_tm->tm_min) | |
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SUNXI_TIME_SET_HOUR_VALUE(rtc_tm->tm_hour); |
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writel(0, chip->base + SUNXI_RTC_HMS); |
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writel(0, chip->base + SUNXI_RTC_YMD); |
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writel(time, chip->base + SUNXI_RTC_HMS); |
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/* |
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* After writing the RTC HH-MM-SS register, the |
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* SUNXI_LOSC_CTRL_RTC_HMS_ACC bit is set and it will not |
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* be cleared until the real writing operation is finished |
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*/ |
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if (sunxi_rtc_wait(chip, SUNXI_LOSC_CTRL, |
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SUNXI_LOSC_CTRL_RTC_HMS_ACC, 50)) { |
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dev_err(dev, "Failed to set rtc time.\n"); |
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return -1; |
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} |
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writel(date, chip->base + SUNXI_RTC_YMD); |
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/* |
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* After writing the RTC YY-MM-DD register, the |
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* SUNXI_LOSC_CTRL_RTC_YMD_ACC bit is set and it will not |
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* be cleared until the real writing operation is finished |
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*/ |
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if (sunxi_rtc_wait(chip, SUNXI_LOSC_CTRL, |
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SUNXI_LOSC_CTRL_RTC_YMD_ACC, 50)) { |
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dev_err(dev, "Failed to set rtc time.\n"); |
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return -1; |
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} |
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return 0; |
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} |
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static int sunxi_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) |
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{ |
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struct sunxi_rtc_dev *chip = dev_get_drvdata(dev); |
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if (!enabled) |
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sunxi_rtc_setaie(enabled, chip); |
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return 0; |
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} |
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static const struct rtc_class_ops sunxi_rtc_ops = { |
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.read_time = sunxi_rtc_gettime, |
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.set_time = sunxi_rtc_settime, |
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.read_alarm = sunxi_rtc_getalarm, |
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.set_alarm = sunxi_rtc_setalarm, |
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.alarm_irq_enable = sunxi_rtc_alarm_irq_enable |
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}; |
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static const struct of_device_id sunxi_rtc_dt_ids[] = { |
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{ .compatible = "allwinner,sun4i-a10-rtc", .data = &data_year_param[0] }, |
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{ .compatible = "allwinner,sun7i-a20-rtc", .data = &data_year_param[1] }, |
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{ /* sentinel */ }, |
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}; |
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MODULE_DEVICE_TABLE(of, sunxi_rtc_dt_ids); |
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static int sunxi_rtc_probe(struct platform_device *pdev) |
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{ |
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struct sunxi_rtc_dev *chip; |
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int ret; |
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chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL); |
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if (!chip) |
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return -ENOMEM; |
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platform_set_drvdata(pdev, chip); |
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chip->dev = &pdev->dev; |
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chip->rtc = devm_rtc_allocate_device(&pdev->dev); |
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if (IS_ERR(chip->rtc)) |
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return PTR_ERR(chip->rtc); |
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chip->base = devm_platform_ioremap_resource(pdev, 0); |
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if (IS_ERR(chip->base)) |
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return PTR_ERR(chip->base); |
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chip->irq = platform_get_irq(pdev, 0); |
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if (chip->irq < 0) |
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return chip->irq; |
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ret = devm_request_irq(&pdev->dev, chip->irq, sunxi_rtc_alarmirq, |
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0, dev_name(&pdev->dev), chip); |
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if (ret) { |
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dev_err(&pdev->dev, "Could not request IRQ\n"); |
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return ret; |
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} |
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chip->data_year = of_device_get_match_data(&pdev->dev); |
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if (!chip->data_year) { |
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dev_err(&pdev->dev, "Unable to setup RTC data\n"); |
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return -ENODEV; |
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} |
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/* clear the alarm count value */ |
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writel(0, chip->base + SUNXI_ALRM_DHMS); |
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/* disable alarm, not generate irq pending */ |
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writel(0, chip->base + SUNXI_ALRM_EN); |
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/* disable alarm week/cnt irq, unset to cpu */ |
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writel(0, chip->base + SUNXI_ALRM_IRQ_EN); |
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/* clear alarm week/cnt irq pending */ |
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writel(SUNXI_ALRM_IRQ_STA_CNT_IRQ_PEND, chip->base + |
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SUNXI_ALRM_IRQ_STA); |
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chip->rtc->ops = &sunxi_rtc_ops; |
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return devm_rtc_register_device(chip->rtc); |
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} |
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static struct platform_driver sunxi_rtc_driver = { |
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.probe = sunxi_rtc_probe, |
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.driver = { |
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.name = "sunxi-rtc", |
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.of_match_table = sunxi_rtc_dt_ids, |
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}, |
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}; |
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module_platform_driver(sunxi_rtc_driver); |
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MODULE_DESCRIPTION("sunxi RTC driver"); |
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MODULE_AUTHOR("Carlo Caione <[email protected]>"); |
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MODULE_LICENSE("GPL");
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