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341 lines
9.2 KiB
341 lines
9.2 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Real Time Clock driver for Marvell 88PM80x PMIC |
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* |
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* Copyright (c) 2012 Marvell International Ltd. |
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* Wenzeng Chen<[email protected]> |
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* Qiao Zhou <[email protected]> |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/slab.h> |
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#include <linux/regmap.h> |
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#include <linux/mfd/core.h> |
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#include <linux/mfd/88pm80x.h> |
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#include <linux/rtc.h> |
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#define PM800_RTC_COUNTER1 (0xD1) |
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#define PM800_RTC_COUNTER2 (0xD2) |
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#define PM800_RTC_COUNTER3 (0xD3) |
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#define PM800_RTC_COUNTER4 (0xD4) |
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#define PM800_RTC_EXPIRE1_1 (0xD5) |
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#define PM800_RTC_EXPIRE1_2 (0xD6) |
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#define PM800_RTC_EXPIRE1_3 (0xD7) |
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#define PM800_RTC_EXPIRE1_4 (0xD8) |
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#define PM800_RTC_TRIM1 (0xD9) |
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#define PM800_RTC_TRIM2 (0xDA) |
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#define PM800_RTC_TRIM3 (0xDB) |
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#define PM800_RTC_TRIM4 (0xDC) |
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#define PM800_RTC_EXPIRE2_1 (0xDD) |
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#define PM800_RTC_EXPIRE2_2 (0xDE) |
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#define PM800_RTC_EXPIRE2_3 (0xDF) |
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#define PM800_RTC_EXPIRE2_4 (0xE0) |
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#define PM800_POWER_DOWN_LOG1 (0xE5) |
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#define PM800_POWER_DOWN_LOG2 (0xE6) |
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struct pm80x_rtc_info { |
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struct pm80x_chip *chip; |
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struct regmap *map; |
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struct rtc_device *rtc_dev; |
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struct device *dev; |
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int irq; |
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}; |
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static irqreturn_t rtc_update_handler(int irq, void *data) |
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{ |
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struct pm80x_rtc_info *info = (struct pm80x_rtc_info *)data; |
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int mask; |
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mask = PM800_ALARM | PM800_ALARM_WAKEUP; |
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regmap_update_bits(info->map, PM800_RTC_CONTROL, mask | PM800_ALARM1_EN, |
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mask); |
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rtc_update_irq(info->rtc_dev, 1, RTC_AF); |
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return IRQ_HANDLED; |
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} |
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static int pm80x_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) |
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{ |
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struct pm80x_rtc_info *info = dev_get_drvdata(dev); |
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if (enabled) |
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regmap_update_bits(info->map, PM800_RTC_CONTROL, |
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PM800_ALARM1_EN, PM800_ALARM1_EN); |
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else |
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regmap_update_bits(info->map, PM800_RTC_CONTROL, |
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PM800_ALARM1_EN, 0); |
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return 0; |
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} |
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/* |
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* Calculate the next alarm time given the requested alarm time mask |
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* and the current time. |
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*/ |
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static void rtc_next_alarm_time(struct rtc_time *next, struct rtc_time *now, |
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struct rtc_time *alrm) |
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{ |
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unsigned long next_time; |
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unsigned long now_time; |
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next->tm_year = now->tm_year; |
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next->tm_mon = now->tm_mon; |
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next->tm_mday = now->tm_mday; |
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next->tm_hour = alrm->tm_hour; |
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next->tm_min = alrm->tm_min; |
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next->tm_sec = alrm->tm_sec; |
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now_time = rtc_tm_to_time64(now); |
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next_time = rtc_tm_to_time64(next); |
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if (next_time < now_time) { |
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/* Advance one day */ |
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next_time += 60 * 60 * 24; |
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rtc_time64_to_tm(next_time, next); |
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} |
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} |
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static int pm80x_rtc_read_time(struct device *dev, struct rtc_time *tm) |
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{ |
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struct pm80x_rtc_info *info = dev_get_drvdata(dev); |
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unsigned char buf[4]; |
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unsigned long ticks, base, data; |
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regmap_raw_read(info->map, PM800_RTC_EXPIRE2_1, buf, 4); |
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base = ((unsigned long)buf[3] << 24) | (buf[2] << 16) | |
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(buf[1] << 8) | buf[0]; |
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dev_dbg(info->dev, "%x-%x-%x-%x\n", buf[0], buf[1], buf[2], buf[3]); |
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/* load 32-bit read-only counter */ |
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regmap_raw_read(info->map, PM800_RTC_COUNTER1, buf, 4); |
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data = ((unsigned long)buf[3] << 24) | (buf[2] << 16) | |
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(buf[1] << 8) | buf[0]; |
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ticks = base + data; |
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dev_dbg(info->dev, "get base:0x%lx, RO count:0x%lx, ticks:0x%lx\n", |
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base, data, ticks); |
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rtc_time64_to_tm(ticks, tm); |
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return 0; |
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} |
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static int pm80x_rtc_set_time(struct device *dev, struct rtc_time *tm) |
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{ |
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struct pm80x_rtc_info *info = dev_get_drvdata(dev); |
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unsigned char buf[4]; |
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unsigned long ticks, base, data; |
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ticks = rtc_tm_to_time64(tm); |
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/* load 32-bit read-only counter */ |
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regmap_raw_read(info->map, PM800_RTC_COUNTER1, buf, 4); |
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data = ((unsigned long)buf[3] << 24) | (buf[2] << 16) | |
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(buf[1] << 8) | buf[0]; |
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base = ticks - data; |
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dev_dbg(info->dev, "set base:0x%lx, RO count:0x%lx, ticks:0x%lx\n", |
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base, data, ticks); |
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buf[0] = base & 0xFF; |
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buf[1] = (base >> 8) & 0xFF; |
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buf[2] = (base >> 16) & 0xFF; |
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buf[3] = (base >> 24) & 0xFF; |
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regmap_raw_write(info->map, PM800_RTC_EXPIRE2_1, buf, 4); |
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return 0; |
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} |
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static int pm80x_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) |
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{ |
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struct pm80x_rtc_info *info = dev_get_drvdata(dev); |
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unsigned char buf[4]; |
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unsigned long ticks, base, data; |
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int ret; |
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regmap_raw_read(info->map, PM800_RTC_EXPIRE2_1, buf, 4); |
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base = ((unsigned long)buf[3] << 24) | (buf[2] << 16) | |
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(buf[1] << 8) | buf[0]; |
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dev_dbg(info->dev, "%x-%x-%x-%x\n", buf[0], buf[1], buf[2], buf[3]); |
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regmap_raw_read(info->map, PM800_RTC_EXPIRE1_1, buf, 4); |
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data = ((unsigned long)buf[3] << 24) | (buf[2] << 16) | |
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(buf[1] << 8) | buf[0]; |
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ticks = base + data; |
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dev_dbg(info->dev, "get base:0x%lx, RO count:0x%lx, ticks:0x%lx\n", |
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base, data, ticks); |
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rtc_time64_to_tm(ticks, &alrm->time); |
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regmap_read(info->map, PM800_RTC_CONTROL, &ret); |
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alrm->enabled = (ret & PM800_ALARM1_EN) ? 1 : 0; |
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alrm->pending = (ret & (PM800_ALARM | PM800_ALARM_WAKEUP)) ? 1 : 0; |
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return 0; |
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} |
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static int pm80x_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) |
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{ |
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struct pm80x_rtc_info *info = dev_get_drvdata(dev); |
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struct rtc_time now_tm, alarm_tm; |
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unsigned long ticks, base, data; |
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unsigned char buf[4]; |
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int mask; |
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regmap_update_bits(info->map, PM800_RTC_CONTROL, PM800_ALARM1_EN, 0); |
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regmap_raw_read(info->map, PM800_RTC_EXPIRE2_1, buf, 4); |
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base = ((unsigned long)buf[3] << 24) | (buf[2] << 16) | |
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(buf[1] << 8) | buf[0]; |
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dev_dbg(info->dev, "%x-%x-%x-%x\n", buf[0], buf[1], buf[2], buf[3]); |
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/* load 32-bit read-only counter */ |
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regmap_raw_read(info->map, PM800_RTC_COUNTER1, buf, 4); |
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data = ((unsigned long)buf[3] << 24) | (buf[2] << 16) | |
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(buf[1] << 8) | buf[0]; |
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ticks = base + data; |
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dev_dbg(info->dev, "get base:0x%lx, RO count:0x%lx, ticks:0x%lx\n", |
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base, data, ticks); |
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rtc_time64_to_tm(ticks, &now_tm); |
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dev_dbg(info->dev, "%s, now time : %lu\n", __func__, ticks); |
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rtc_next_alarm_time(&alarm_tm, &now_tm, &alrm->time); |
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/* get new ticks for alarm in 24 hours */ |
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ticks = rtc_tm_to_time64(&alarm_tm); |
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dev_dbg(info->dev, "%s, alarm time: %lu\n", __func__, ticks); |
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data = ticks - base; |
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buf[0] = data & 0xff; |
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buf[1] = (data >> 8) & 0xff; |
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buf[2] = (data >> 16) & 0xff; |
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buf[3] = (data >> 24) & 0xff; |
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regmap_raw_write(info->map, PM800_RTC_EXPIRE1_1, buf, 4); |
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if (alrm->enabled) { |
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mask = PM800_ALARM | PM800_ALARM_WAKEUP | PM800_ALARM1_EN; |
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regmap_update_bits(info->map, PM800_RTC_CONTROL, mask, mask); |
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} else { |
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mask = PM800_ALARM | PM800_ALARM_WAKEUP | PM800_ALARM1_EN; |
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regmap_update_bits(info->map, PM800_RTC_CONTROL, mask, |
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PM800_ALARM | PM800_ALARM_WAKEUP); |
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} |
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return 0; |
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} |
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static const struct rtc_class_ops pm80x_rtc_ops = { |
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.read_time = pm80x_rtc_read_time, |
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.set_time = pm80x_rtc_set_time, |
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.read_alarm = pm80x_rtc_read_alarm, |
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.set_alarm = pm80x_rtc_set_alarm, |
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.alarm_irq_enable = pm80x_rtc_alarm_irq_enable, |
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}; |
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#ifdef CONFIG_PM_SLEEP |
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static int pm80x_rtc_suspend(struct device *dev) |
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{ |
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return pm80x_dev_suspend(dev); |
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} |
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static int pm80x_rtc_resume(struct device *dev) |
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{ |
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return pm80x_dev_resume(dev); |
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} |
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#endif |
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static SIMPLE_DEV_PM_OPS(pm80x_rtc_pm_ops, pm80x_rtc_suspend, pm80x_rtc_resume); |
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static int pm80x_rtc_probe(struct platform_device *pdev) |
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{ |
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struct pm80x_chip *chip = dev_get_drvdata(pdev->dev.parent); |
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struct pm80x_rtc_pdata *pdata = dev_get_platdata(&pdev->dev); |
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struct pm80x_rtc_info *info; |
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struct device_node *node = pdev->dev.of_node; |
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int ret; |
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if (!pdata && !node) { |
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dev_err(&pdev->dev, |
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"pm80x-rtc requires platform data or of_node\n"); |
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return -EINVAL; |
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} |
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if (!pdata) { |
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pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); |
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if (!pdata) { |
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dev_err(&pdev->dev, "failed to allocate memory\n"); |
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return -ENOMEM; |
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} |
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} |
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info = |
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devm_kzalloc(&pdev->dev, sizeof(struct pm80x_rtc_info), GFP_KERNEL); |
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if (!info) |
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return -ENOMEM; |
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info->irq = platform_get_irq(pdev, 0); |
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if (info->irq < 0) { |
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ret = -EINVAL; |
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goto out; |
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} |
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info->chip = chip; |
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info->map = chip->regmap; |
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if (!info->map) { |
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dev_err(&pdev->dev, "no regmap!\n"); |
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ret = -EINVAL; |
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goto out; |
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} |
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info->dev = &pdev->dev; |
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dev_set_drvdata(&pdev->dev, info); |
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info->rtc_dev = devm_rtc_allocate_device(&pdev->dev); |
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if (IS_ERR(info->rtc_dev)) |
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return PTR_ERR(info->rtc_dev); |
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ret = pm80x_request_irq(chip, info->irq, rtc_update_handler, |
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IRQF_ONESHOT, "rtc", info); |
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if (ret < 0) { |
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dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n", |
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info->irq, ret); |
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goto out; |
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} |
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info->rtc_dev->ops = &pm80x_rtc_ops; |
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info->rtc_dev->range_max = U32_MAX; |
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ret = devm_rtc_register_device(info->rtc_dev); |
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if (ret) |
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goto out_rtc; |
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/* |
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* enable internal XO instead of internal 3.25MHz clock since it can |
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* free running in PMIC power-down state. |
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*/ |
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regmap_update_bits(info->map, PM800_RTC_CONTROL, PM800_RTC1_USE_XO, |
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PM800_RTC1_USE_XO); |
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/* remember whether this power up is caused by PMIC RTC or not */ |
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info->rtc_dev->dev.platform_data = &pdata->rtc_wakeup; |
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device_init_wakeup(&pdev->dev, 1); |
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return 0; |
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out_rtc: |
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pm80x_free_irq(chip, info->irq, info); |
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out: |
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return ret; |
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} |
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static int pm80x_rtc_remove(struct platform_device *pdev) |
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{ |
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struct pm80x_rtc_info *info = platform_get_drvdata(pdev); |
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pm80x_free_irq(info->chip, info->irq, info); |
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return 0; |
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} |
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static struct platform_driver pm80x_rtc_driver = { |
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.driver = { |
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.name = "88pm80x-rtc", |
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.pm = &pm80x_rtc_pm_ops, |
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}, |
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.probe = pm80x_rtc_probe, |
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.remove = pm80x_rtc_remove, |
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}; |
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module_platform_driver(pm80x_rtc_driver); |
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MODULE_LICENSE("GPL"); |
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MODULE_DESCRIPTION("Marvell 88PM80x RTC driver"); |
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MODULE_AUTHOR("Qiao Zhou <[email protected]>"); |
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MODULE_ALIAS("platform:88pm80x-rtc");
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