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467 lines
13 KiB
467 lines
13 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* RTC driver for Rockchip RK808 |
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* |
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* Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd |
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* |
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* Author: Chris Zhong <[email protected]> |
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* Author: Zhang Qing <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/kernel.h> |
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#include <linux/rtc.h> |
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#include <linux/bcd.h> |
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#include <linux/mfd/rk808.h> |
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#include <linux/platform_device.h> |
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#include <linux/i2c.h> |
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/* RTC_CTRL_REG bitfields */ |
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#define BIT_RTC_CTRL_REG_STOP_RTC_M BIT(0) |
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/* RK808 has a shadowed register for saving a "frozen" RTC time. |
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* When user setting "GET_TIME" to 1, the time will save in this shadowed |
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* register. If set "READSEL" to 1, user read rtc time register, actually |
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* get the time of that moment. If we need the real time, clr this bit. |
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*/ |
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#define BIT_RTC_CTRL_REG_RTC_GET_TIME BIT(6) |
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#define BIT_RTC_CTRL_REG_RTC_READSEL_M BIT(7) |
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#define BIT_RTC_INTERRUPTS_REG_IT_ALARM_M BIT(3) |
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#define RTC_STATUS_MASK 0xFE |
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#define SECONDS_REG_MSK 0x7F |
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#define MINUTES_REG_MAK 0x7F |
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#define HOURS_REG_MSK 0x3F |
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#define DAYS_REG_MSK 0x3F |
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#define MONTHS_REG_MSK 0x1F |
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#define YEARS_REG_MSK 0xFF |
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#define WEEKS_REG_MSK 0x7 |
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/* REG_SECONDS_REG through REG_YEARS_REG is how many registers? */ |
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#define NUM_TIME_REGS (RK808_WEEKS_REG - RK808_SECONDS_REG + 1) |
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#define NUM_ALARM_REGS (RK808_ALARM_YEARS_REG - RK808_ALARM_SECONDS_REG + 1) |
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struct rk_rtc_compat_reg { |
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unsigned int ctrl_reg; |
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unsigned int status_reg; |
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unsigned int alarm_seconds_reg; |
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unsigned int int_reg; |
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unsigned int seconds_reg; |
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}; |
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struct rk808_rtc { |
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struct rk808 *rk808; |
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struct rtc_device *rtc; |
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struct rk_rtc_compat_reg *creg; |
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int irq; |
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}; |
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/* |
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* The Rockchip calendar used by the RK808 counts November with 31 days. We use |
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* these translation functions to convert its dates to/from the Gregorian |
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* calendar used by the rest of the world. We arbitrarily define Jan 1st, 2016 |
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* as the day when both calendars were in sync, and treat all other dates |
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* relative to that. |
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* NOTE: Other system software (e.g. firmware) that reads the same hardware must |
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* implement this exact same conversion algorithm, with the same anchor date. |
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*/ |
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static time64_t nov2dec_transitions(struct rtc_time *tm) |
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{ |
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return (tm->tm_year + 1900) - 2016 + (tm->tm_mon + 1 > 11 ? 1 : 0); |
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} |
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static void rockchip_to_gregorian(struct rtc_time *tm) |
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{ |
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/* If it's Nov 31st, rtc_tm_to_time64() will count that like Dec 1st */ |
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time64_t time = rtc_tm_to_time64(tm); |
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rtc_time64_to_tm(time + nov2dec_transitions(tm) * 86400, tm); |
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} |
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static void gregorian_to_rockchip(struct rtc_time *tm) |
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{ |
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time64_t extra_days = nov2dec_transitions(tm); |
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time64_t time = rtc_tm_to_time64(tm); |
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rtc_time64_to_tm(time - extra_days * 86400, tm); |
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/* Compensate if we went back over Nov 31st (will work up to 2381) */ |
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if (nov2dec_transitions(tm) < extra_days) { |
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if (tm->tm_mon + 1 == 11) |
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tm->tm_mday++; /* This may result in 31! */ |
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else |
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rtc_time64_to_tm(time - (extra_days - 1) * 86400, tm); |
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} |
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} |
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/* Read current time and date in RTC */ |
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static int rk808_rtc_readtime(struct device *dev, struct rtc_time *tm) |
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{ |
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struct rk808_rtc *rk808_rtc = dev_get_drvdata(dev); |
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struct rk808 *rk808 = rk808_rtc->rk808; |
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u8 rtc_data[NUM_TIME_REGS]; |
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int ret; |
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/* Force an update of the shadowed registers right now */ |
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ret = regmap_update_bits(rk808->regmap, rk808_rtc->creg->ctrl_reg, |
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BIT_RTC_CTRL_REG_RTC_GET_TIME, |
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BIT_RTC_CTRL_REG_RTC_GET_TIME); |
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if (ret) { |
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dev_err(dev, "Failed to update bits rtc_ctrl: %d\n", ret); |
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return ret; |
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} |
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/* |
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* After we set the GET_TIME bit, the rtc time can't be read |
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* immediately. So we should wait up to 31.25 us, about one cycle of |
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* 32khz. If we clear the GET_TIME bit here, the time of i2c transfer |
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* certainly more than 31.25us: 16 * 2.5us at 400kHz bus frequency. |
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*/ |
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ret = regmap_update_bits(rk808->regmap, rk808_rtc->creg->ctrl_reg, |
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BIT_RTC_CTRL_REG_RTC_GET_TIME, |
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0); |
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if (ret) { |
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dev_err(dev, "Failed to update bits rtc_ctrl: %d\n", ret); |
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return ret; |
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} |
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ret = regmap_bulk_read(rk808->regmap, rk808_rtc->creg->seconds_reg, |
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rtc_data, NUM_TIME_REGS); |
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if (ret) { |
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dev_err(dev, "Failed to bulk read rtc_data: %d\n", ret); |
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return ret; |
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} |
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tm->tm_sec = bcd2bin(rtc_data[0] & SECONDS_REG_MSK); |
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tm->tm_min = bcd2bin(rtc_data[1] & MINUTES_REG_MAK); |
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tm->tm_hour = bcd2bin(rtc_data[2] & HOURS_REG_MSK); |
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tm->tm_mday = bcd2bin(rtc_data[3] & DAYS_REG_MSK); |
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tm->tm_mon = (bcd2bin(rtc_data[4] & MONTHS_REG_MSK)) - 1; |
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tm->tm_year = (bcd2bin(rtc_data[5] & YEARS_REG_MSK)) + 100; |
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tm->tm_wday = bcd2bin(rtc_data[6] & WEEKS_REG_MSK); |
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rockchip_to_gregorian(tm); |
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dev_dbg(dev, "RTC date/time %ptRd(%d) %ptRt\n", tm, tm->tm_wday, tm); |
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return ret; |
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} |
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/* Set current time and date in RTC */ |
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static int rk808_rtc_set_time(struct device *dev, struct rtc_time *tm) |
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{ |
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struct rk808_rtc *rk808_rtc = dev_get_drvdata(dev); |
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struct rk808 *rk808 = rk808_rtc->rk808; |
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u8 rtc_data[NUM_TIME_REGS]; |
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int ret; |
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dev_dbg(dev, "set RTC date/time %ptRd(%d) %ptRt\n", tm, tm->tm_wday, tm); |
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gregorian_to_rockchip(tm); |
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rtc_data[0] = bin2bcd(tm->tm_sec); |
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rtc_data[1] = bin2bcd(tm->tm_min); |
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rtc_data[2] = bin2bcd(tm->tm_hour); |
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rtc_data[3] = bin2bcd(tm->tm_mday); |
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rtc_data[4] = bin2bcd(tm->tm_mon + 1); |
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rtc_data[5] = bin2bcd(tm->tm_year - 100); |
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rtc_data[6] = bin2bcd(tm->tm_wday); |
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/* Stop RTC while updating the RTC registers */ |
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ret = regmap_update_bits(rk808->regmap, rk808_rtc->creg->ctrl_reg, |
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BIT_RTC_CTRL_REG_STOP_RTC_M, |
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BIT_RTC_CTRL_REG_STOP_RTC_M); |
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if (ret) { |
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dev_err(dev, "Failed to update RTC control: %d\n", ret); |
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return ret; |
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} |
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ret = regmap_bulk_write(rk808->regmap, rk808_rtc->creg->seconds_reg, |
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rtc_data, NUM_TIME_REGS); |
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if (ret) { |
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dev_err(dev, "Failed to bull write rtc_data: %d\n", ret); |
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return ret; |
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} |
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/* Start RTC again */ |
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ret = regmap_update_bits(rk808->regmap, rk808_rtc->creg->ctrl_reg, |
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BIT_RTC_CTRL_REG_STOP_RTC_M, 0); |
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if (ret) { |
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dev_err(dev, "Failed to update RTC control: %d\n", ret); |
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return ret; |
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} |
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return 0; |
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} |
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/* Read alarm time and date in RTC */ |
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static int rk808_rtc_readalarm(struct device *dev, struct rtc_wkalrm *alrm) |
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{ |
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struct rk808_rtc *rk808_rtc = dev_get_drvdata(dev); |
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struct rk808 *rk808 = rk808_rtc->rk808; |
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u8 alrm_data[NUM_ALARM_REGS]; |
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uint32_t int_reg; |
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int ret; |
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ret = regmap_bulk_read(rk808->regmap, |
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rk808_rtc->creg->alarm_seconds_reg, |
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alrm_data, NUM_ALARM_REGS); |
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if (ret) { |
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dev_err(dev, "Failed to read RTC alarm date REG: %d\n", ret); |
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return ret; |
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} |
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alrm->time.tm_sec = bcd2bin(alrm_data[0] & SECONDS_REG_MSK); |
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alrm->time.tm_min = bcd2bin(alrm_data[1] & MINUTES_REG_MAK); |
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alrm->time.tm_hour = bcd2bin(alrm_data[2] & HOURS_REG_MSK); |
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alrm->time.tm_mday = bcd2bin(alrm_data[3] & DAYS_REG_MSK); |
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alrm->time.tm_mon = (bcd2bin(alrm_data[4] & MONTHS_REG_MSK)) - 1; |
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alrm->time.tm_year = (bcd2bin(alrm_data[5] & YEARS_REG_MSK)) + 100; |
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rockchip_to_gregorian(&alrm->time); |
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ret = regmap_read(rk808->regmap, rk808_rtc->creg->int_reg, &int_reg); |
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if (ret) { |
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dev_err(dev, "Failed to read RTC INT REG: %d\n", ret); |
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return ret; |
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} |
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dev_dbg(dev, "alrm read RTC date/time %ptRd(%d) %ptRt\n", |
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&alrm->time, alrm->time.tm_wday, &alrm->time); |
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alrm->enabled = (int_reg & BIT_RTC_INTERRUPTS_REG_IT_ALARM_M) ? 1 : 0; |
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return 0; |
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} |
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static int rk808_rtc_stop_alarm(struct rk808_rtc *rk808_rtc) |
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{ |
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struct rk808 *rk808 = rk808_rtc->rk808; |
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int ret; |
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ret = regmap_update_bits(rk808->regmap, rk808_rtc->creg->int_reg, |
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BIT_RTC_INTERRUPTS_REG_IT_ALARM_M, 0); |
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return ret; |
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} |
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static int rk808_rtc_start_alarm(struct rk808_rtc *rk808_rtc) |
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{ |
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struct rk808 *rk808 = rk808_rtc->rk808; |
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int ret; |
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ret = regmap_update_bits(rk808->regmap, rk808_rtc->creg->int_reg, |
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BIT_RTC_INTERRUPTS_REG_IT_ALARM_M, |
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BIT_RTC_INTERRUPTS_REG_IT_ALARM_M); |
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return ret; |
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} |
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static int rk808_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm) |
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{ |
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struct rk808_rtc *rk808_rtc = dev_get_drvdata(dev); |
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struct rk808 *rk808 = rk808_rtc->rk808; |
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u8 alrm_data[NUM_ALARM_REGS]; |
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int ret; |
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ret = rk808_rtc_stop_alarm(rk808_rtc); |
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if (ret) { |
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dev_err(dev, "Failed to stop alarm: %d\n", ret); |
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return ret; |
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} |
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dev_dbg(dev, "alrm set RTC date/time %ptRd(%d) %ptRt\n", |
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&alrm->time, alrm->time.tm_wday, &alrm->time); |
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gregorian_to_rockchip(&alrm->time); |
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alrm_data[0] = bin2bcd(alrm->time.tm_sec); |
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alrm_data[1] = bin2bcd(alrm->time.tm_min); |
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alrm_data[2] = bin2bcd(alrm->time.tm_hour); |
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alrm_data[3] = bin2bcd(alrm->time.tm_mday); |
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alrm_data[4] = bin2bcd(alrm->time.tm_mon + 1); |
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alrm_data[5] = bin2bcd(alrm->time.tm_year - 100); |
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ret = regmap_bulk_write(rk808->regmap, |
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rk808_rtc->creg->alarm_seconds_reg, |
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alrm_data, NUM_ALARM_REGS); |
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if (ret) { |
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dev_err(dev, "Failed to bulk write: %d\n", ret); |
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return ret; |
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} |
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if (alrm->enabled) { |
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ret = rk808_rtc_start_alarm(rk808_rtc); |
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if (ret) { |
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dev_err(dev, "Failed to start alarm: %d\n", ret); |
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return ret; |
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} |
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} |
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return 0; |
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} |
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static int rk808_rtc_alarm_irq_enable(struct device *dev, |
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unsigned int enabled) |
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{ |
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struct rk808_rtc *rk808_rtc = dev_get_drvdata(dev); |
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if (enabled) |
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return rk808_rtc_start_alarm(rk808_rtc); |
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return rk808_rtc_stop_alarm(rk808_rtc); |
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} |
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/* |
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* We will just handle setting the frequency and make use the framework for |
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* reading the periodic interupts. |
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* |
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* @freq: Current periodic IRQ freq: |
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* bit 0: every second |
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* bit 1: every minute |
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* bit 2: every hour |
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* bit 3: every day |
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*/ |
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static irqreturn_t rk808_alarm_irq(int irq, void *data) |
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{ |
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struct rk808_rtc *rk808_rtc = data; |
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struct rk808 *rk808 = rk808_rtc->rk808; |
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struct i2c_client *client = rk808->i2c; |
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int ret; |
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ret = regmap_write(rk808->regmap, rk808_rtc->creg->status_reg, |
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RTC_STATUS_MASK); |
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if (ret) { |
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dev_err(&client->dev, |
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"%s:Failed to update RTC status: %d\n", __func__, ret); |
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return ret; |
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} |
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rtc_update_irq(rk808_rtc->rtc, 1, RTC_IRQF | RTC_AF); |
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dev_dbg(&client->dev, |
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"%s:irq=%d\n", __func__, irq); |
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return IRQ_HANDLED; |
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} |
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static const struct rtc_class_ops rk808_rtc_ops = { |
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.read_time = rk808_rtc_readtime, |
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.set_time = rk808_rtc_set_time, |
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.read_alarm = rk808_rtc_readalarm, |
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.set_alarm = rk808_rtc_setalarm, |
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.alarm_irq_enable = rk808_rtc_alarm_irq_enable, |
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}; |
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#ifdef CONFIG_PM_SLEEP |
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/* Turn off the alarm if it should not be a wake source. */ |
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static int rk808_rtc_suspend(struct device *dev) |
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{ |
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struct rk808_rtc *rk808_rtc = dev_get_drvdata(dev); |
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if (device_may_wakeup(dev)) |
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enable_irq_wake(rk808_rtc->irq); |
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return 0; |
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} |
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/* Enable the alarm if it should be enabled (in case it was disabled to |
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* prevent use as a wake source). |
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*/ |
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static int rk808_rtc_resume(struct device *dev) |
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{ |
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struct rk808_rtc *rk808_rtc = dev_get_drvdata(dev); |
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if (device_may_wakeup(dev)) |
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disable_irq_wake(rk808_rtc->irq); |
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return 0; |
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} |
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#endif |
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static SIMPLE_DEV_PM_OPS(rk808_rtc_pm_ops, |
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rk808_rtc_suspend, rk808_rtc_resume); |
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static struct rk_rtc_compat_reg rk808_creg = { |
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.ctrl_reg = RK808_RTC_CTRL_REG, |
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.status_reg = RK808_RTC_STATUS_REG, |
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.alarm_seconds_reg = RK808_ALARM_SECONDS_REG, |
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.int_reg = RK808_RTC_INT_REG, |
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.seconds_reg = RK808_SECONDS_REG, |
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}; |
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static struct rk_rtc_compat_reg rk817_creg = { |
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.ctrl_reg = RK817_RTC_CTRL_REG, |
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.status_reg = RK817_RTC_STATUS_REG, |
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.alarm_seconds_reg = RK817_ALARM_SECONDS_REG, |
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.int_reg = RK817_RTC_INT_REG, |
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.seconds_reg = RK817_SECONDS_REG, |
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}; |
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static int rk808_rtc_probe(struct platform_device *pdev) |
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{ |
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struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent); |
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struct rk808_rtc *rk808_rtc; |
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int ret; |
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rk808_rtc = devm_kzalloc(&pdev->dev, sizeof(*rk808_rtc), GFP_KERNEL); |
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if (rk808_rtc == NULL) |
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return -ENOMEM; |
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switch (rk808->variant) { |
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case RK809_ID: |
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case RK817_ID: |
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rk808_rtc->creg = &rk817_creg; |
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break; |
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default: |
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rk808_rtc->creg = &rk808_creg; |
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break; |
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} |
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platform_set_drvdata(pdev, rk808_rtc); |
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rk808_rtc->rk808 = rk808; |
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/* start rtc running by default, and use shadowed timer. */ |
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ret = regmap_update_bits(rk808->regmap, rk808_rtc->creg->ctrl_reg, |
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BIT_RTC_CTRL_REG_STOP_RTC_M | |
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BIT_RTC_CTRL_REG_RTC_READSEL_M, |
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BIT_RTC_CTRL_REG_RTC_READSEL_M); |
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if (ret) { |
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dev_err(&pdev->dev, |
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"Failed to update RTC control: %d\n", ret); |
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return ret; |
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} |
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ret = regmap_write(rk808->regmap, rk808_rtc->creg->status_reg, |
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RTC_STATUS_MASK); |
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if (ret) { |
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dev_err(&pdev->dev, |
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"Failed to write RTC status: %d\n", ret); |
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return ret; |
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} |
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device_init_wakeup(&pdev->dev, 1); |
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rk808_rtc->rtc = devm_rtc_allocate_device(&pdev->dev); |
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if (IS_ERR(rk808_rtc->rtc)) |
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return PTR_ERR(rk808_rtc->rtc); |
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rk808_rtc->rtc->ops = &rk808_rtc_ops; |
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rk808_rtc->irq = platform_get_irq(pdev, 0); |
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if (rk808_rtc->irq < 0) |
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return rk808_rtc->irq; |
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/* request alarm irq of rk808 */ |
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ret = devm_request_threaded_irq(&pdev->dev, rk808_rtc->irq, NULL, |
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rk808_alarm_irq, 0, |
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"RTC alarm", rk808_rtc); |
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if (ret) { |
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dev_err(&pdev->dev, "Failed to request alarm IRQ %d: %d\n", |
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rk808_rtc->irq, ret); |
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return ret; |
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} |
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return devm_rtc_register_device(rk808_rtc->rtc); |
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} |
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static struct platform_driver rk808_rtc_driver = { |
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.probe = rk808_rtc_probe, |
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.driver = { |
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.name = "rk808-rtc", |
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.pm = &rk808_rtc_pm_ops, |
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}, |
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}; |
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module_platform_driver(rk808_rtc_driver); |
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MODULE_DESCRIPTION("RTC driver for the rk808 series PMICs"); |
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MODULE_AUTHOR("Chris Zhong <[email protected]>"); |
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MODULE_AUTHOR("Zhang Qing <[email protected]>"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS("platform:rk808-rtc");
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