// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2023 Rockchip Electronics Co., Ltd
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*/
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#include <linux/bcd.h>
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#include <linux/kernel.h>
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#include <linux/mfd/rk630.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/rtc.h>
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/* RTC_CTRL_REG bitfields */
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#define RTC_CTRL_REG_START_RTC BIT(0)
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/* RK630 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 RTC_CTRL_REG_RTC_GET_TIME BIT(6)
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#define RTC_CTRL_REG_RTC_READSEL_M BIT(7)
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#define RTC_INT_REG_ALARM_EN BIT(7)
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#define RTC_STATUS_MASK 0xFF
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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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#define RTC_VREF_INIT 0x40
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#define RTC_XO_START_MIR 0x40
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#define NUM_TIME_REGS 8
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#define NUM_ALARM_REGS 7
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#define DISABLE_ALARM_INT 0x3F
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#define ENABLE_ALARM_INT 0xFF
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#define ALARM_INT_STATUS BIT(4)
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#define CLK32K_TEST_EN BIT(0)
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#define CLK32K_TEST_START BIT(0)
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#define CLK32K_TEST_STATUS BIT(1)
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#define CLK32K_TEST_DONE BIT(2)
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#define CLK32K_TEST_LEN 2
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#define CLK32K_COMP_DIR_ADD BIT(7)
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#define CLK32K_COMP_EN BIT(2)
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#define CLK32K_NO_COMP 0x1
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#define CLK32K_TEST_REF_CLK 25000000
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struct rk630_rtc {
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struct rk630 *rk630;
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struct rtc_device *rtc;
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int irq;
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unsigned int flag;
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};
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/* Read current time and date in RTC */
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static int rk630_rtc_readtime(struct device *dev, struct rtc_time *tm)
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{
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struct rk630_rtc *rk630_rtc = dev_get_drvdata(dev);
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struct rk630 *rk630 = rk630_rtc->rk630;
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u32 rtc_data[NUM_TIME_REGS];
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int ret;
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int yearl, yearh;
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/* Force an update of the shadowed registers right now */
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ret = regmap_update_bits(rk630->rtc, RTC_CTRL,
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RTC_CTRL_REG_RTC_GET_TIME,
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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(rk630->rtc, RTC_CTRL,
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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(rk630->rtc, RTC_SET_SECONDS,
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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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yearl = (bcd2bin(rtc_data[5] & YEARS_REG_MSK));
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yearh = (bcd2bin(rtc_data[6] & YEARS_REG_MSK));
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tm->tm_year = yearh * 100 + yearl + 100;
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tm->tm_wday = bcd2bin(rtc_data[7] & WEEKS_REG_MSK);
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dev_dbg(dev, "RTC date/time %4d-%02d-%02d(%d) %02d:%02d:%02d\n",
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1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
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tm->tm_wday, tm->tm_hour, tm->tm_min, tm->tm_sec);
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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 rk630_rtc_set_time(struct device *dev, struct rtc_time *tm)
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{
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struct rk630_rtc *rk630_rtc = dev_get_drvdata(dev);
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struct rk630 *rk630 = rk630_rtc->rk630;
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u32 rtc_data[NUM_TIME_REGS];
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int ret;
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int yearl, yearh;
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dev_dbg(dev, "set RTC date/time %4d-%02d-%02d(%d) %02d:%02d:%02d\n",
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1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
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tm->tm_wday, tm->tm_hour, tm->tm_min, tm->tm_sec);
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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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if (tm->tm_year > 199) {
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yearh = (tm->tm_year - 100) / 100;
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yearl = tm->tm_year - 100 - yearh * 100;
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} else {
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yearh = 0;
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yearl = tm->tm_year - 100 - yearh * 100;
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}
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rtc_data[5] = bin2bcd(yearl);
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rtc_data[6] = bin2bcd(yearh);
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rtc_data[7] = bin2bcd(tm->tm_wday);
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/* Stop RTC while updating the RTC registers */
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ret = regmap_update_bits(rk630->rtc, RTC_CTRL,
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RTC_CTRL_REG_START_RTC, 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_write(rk630->rtc, RTC_SET_SECONDS,
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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(rk630->rtc, RTC_CTRL,
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RTC_CTRL_REG_RTC_READSEL_M |
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RTC_CTRL_REG_START_RTC,
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RTC_CTRL_REG_RTC_READSEL_M |
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RTC_CTRL_REG_START_RTC);
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if (ret) {
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dev_err(dev, "Failed to update bits 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 rk630_rtc_readalarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct rk630_rtc *rk630_rtc = dev_get_drvdata(dev);
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struct rk630 *rk630 = rk630_rtc->rk630;
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u32 alrm_data[NUM_ALARM_REGS];
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u32 int_reg;
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int yearl, yearh;
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int ret;
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ret = regmap_bulk_read(rk630->rtc,
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RTC_ALARM_SECONDS,
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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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yearl = (bcd2bin(alrm_data[5] & YEARS_REG_MSK));
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yearh = (bcd2bin(alrm_data[6] & YEARS_REG_MSK));
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alrm->time.tm_year = yearh * 100 + yearl + 100;
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ret = regmap_read(rk630->rtc, RTC_INT0_EN, &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 %4d-%02d-%02d(%d) %02d:%02d:%02d\n",
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1900 + alrm->time.tm_year, alrm->time.tm_mon + 1,
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alrm->time.tm_mday, alrm->time.tm_wday, alrm->time.tm_hour,
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alrm->time.tm_min, alrm->time.tm_sec);
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alrm->enabled = (int_reg & RTC_INT_REG_ALARM_EN) ? 1 : 0;
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return 0;
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}
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static int rk630_rtc_stop_alarm(struct rk630_rtc *rk630_rtc)
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{
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struct rk630 *rk630 = rk630_rtc->rk630;
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int ret;
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ret = regmap_write(rk630->rtc, RTC_INT0_EN, DISABLE_ALARM_INT);
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return ret;
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}
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static int rk630_rtc_start_alarm(struct rk630_rtc *rk630_rtc)
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{
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struct rk630 *rk630 = rk630_rtc->rk630;
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int ret = 0;
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ret = regmap_write(rk630->rtc, RTC_STATUS0, RTC_STATUS_MASK);
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if (ret) {
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dev_err(rk630->dev, "Failed to write RTC_STATUS0: %d\n", ret);
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return ret;
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}
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ret = regmap_write(rk630->rtc, RTC_STATUS0, 0);
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if (ret) {
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dev_err(rk630->dev, "Failed to write RTC_STATUS0: %d\n", ret);
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return ret;
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}
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ret = regmap_write(rk630->rtc, RTC_INT0_EN, ENABLE_ALARM_INT);
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if (ret) {
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dev_err(rk630->dev, "Failed to write RTC_INT0_EN: %d\n", ret);
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return ret;
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}
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return ret;
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}
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static int rk630_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct rk630_rtc *rk630_rtc = dev_get_drvdata(dev);
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struct rk630 *rk630 = rk630_rtc->rk630;
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u32 alrm_data[NUM_ALARM_REGS];
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int yearl, yearh;
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int ret;
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ret = rk630_rtc_stop_alarm(rk630_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 %4d-%02d-%02d(%d) %02d:%02d:%02d\n",
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1900 + alrm->time.tm_year, alrm->time.tm_mon + 1,
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alrm->time.tm_mday, alrm->time.tm_wday, alrm->time.tm_hour,
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alrm->time.tm_min, alrm->time.tm_sec);
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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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if (alrm->time.tm_year > 199) {
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yearh = (alrm->time.tm_year - 100) / 100;
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yearl = alrm->time.tm_year - 100 - yearh * 100;
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} else {
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yearh = 0;
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yearl = alrm->time.tm_year - 100 - yearh * 100;
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}
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alrm_data[5] = bin2bcd(yearl);
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alrm_data[6] = bin2bcd(yearh);
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ret = regmap_bulk_write(rk630->rtc,
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RTC_ALARM_SECONDS,
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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 = rk630_rtc_start_alarm(rk630_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 rk630_rtc_alarm_irq_enable(struct device *dev,
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unsigned int enabled)
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{
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struct rk630_rtc *rk630_rtc = dev_get_drvdata(dev);
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if (enabled)
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return rk630_rtc_start_alarm(rk630_rtc);
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return rk630_rtc_stop_alarm(rk630_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 interrupts.
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*
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*/
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static irqreturn_t rk630_alarm_irq(int irq, void *data)
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{
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struct rk630_rtc *rk630_rtc = data;
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struct rk630 *rk630 = rk630_rtc->rk630;
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int ret, status;
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ret = regmap_read(rk630->rtc, RTC_STATUS0, &status);
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if (ret) {
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pr_err("Failed to read RTC INT REG: %d\n", ret);
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return ret;
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}
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ret = regmap_write(rk630->rtc, RTC_STATUS0, status);
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if (ret) {
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pr_err("%s:Failed to update RTC status: %d\n", __func__, ret);
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return ret;
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}
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ret = regmap_write(rk630->rtc, RTC_STATUS0, 0x0);
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if (ret) {
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pr_err("%s:Failed to update RTC status: %d\n", __func__, ret);
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return ret;
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}
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if (status & ALARM_INT_STATUS) {
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pr_info("Alarm by: %s\n", __func__);
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rtc_update_irq(rk630_rtc->rtc, 1, RTC_IRQF | RTC_AF);
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}
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return IRQ_HANDLED;
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}
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static const struct rtc_class_ops rk630_rtc_ops = {
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.read_time = rk630_rtc_readtime,
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.set_time = rk630_rtc_set_time,
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.read_alarm = rk630_rtc_readalarm,
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.set_alarm = rk630_rtc_setalarm,
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.alarm_irq_enable = rk630_rtc_alarm_irq_enable,
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};
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/*
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* Due to the analog generator 32k clock affected by
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* temperature, voltage, clock precision need test
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* with the environment change. In rtc test,
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* use 24M clock as reference clock to measure the 32k clock.
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* Before start test 32k clock, we should enable clk32k test(0x80),
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* and configure test length, when rtc test done(0x84[2]),
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* latch the 24M clock domain counter,
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* and read out the counter from rtc_test
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* registers(0x8c~0x98) via apb bus.
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* In RTC digital design, we set three level compensation,
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* the compensation value due to the
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* RTC 32k clock test result, and if we need compensation,
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* we need configure the compensation enable bit.
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* Comp every hour, compensation at last minute every hour,
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* and support add time and sub time by the MSB bit.
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* Comp every day, compensation at last minute in last hour every day,
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* and support add time and sub time by the MSB bit.
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* Comp every month, compensation at last minute
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* in last hour in last day every month,
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* and support add time and sub time by the MSB bit.
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*/
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static int rk630_rtc_compensation(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct rk630_rtc *rk630_rtc = dev_get_drvdata(&pdev->dev);
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struct rk630 *rk630 = rk630_rtc->rk630;
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u64 camp;
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u32 count[4], counts, g_ref, tcamp;
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int ret, done = 0, trim_dir, c_hour,
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c_day, c_det_day, c_mon, c_det_mon;
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ret = regmap_write(rk630->rtc, RTC_CLK32K_TEST, CLK32K_TEST_EN);
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if (ret) {
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dev_err(dev,
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"%s:Failed to update RTC CLK32K TEST: %d\n",
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__func__, ret);
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return ret;
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}
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ret = regmap_write(rk630->rtc, RTC_TEST_LEN, CLK32K_TEST_LEN);
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if (ret) {
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dev_err(dev,
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"%s:Failed to update RTC CLK32K TEST LEN: %d\n",
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__func__, ret);
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return ret;
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}
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ret = regmap_write(rk630->rtc, RTC_TEST_ST, CLK32K_TEST_START);
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if (ret) {
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dev_err(dev,
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"%s:Failed to update RTC CLK32K TEST STATUS : %d\n",
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__func__, ret);
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return ret;
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}
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while (!done) {
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ret = regmap_read(rk630->rtc, RTC_TEST_ST, &done);
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if (ret) {
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dev_err(dev,
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"Failed to read RTC CLK32K TEST STATUS: %d\n",
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ret);
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return ret;
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}
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done = (done & CLK32K_TEST_DONE) >> 2;
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udelay(1);
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}
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ret = regmap_bulk_read(rk630->rtc, RTC_CNT_0, count, 4);
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if (ret) {
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dev_err(dev, "Failed to read RTC count REG: %d\n", ret);
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return ret;
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}
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counts = count[0] | (count[1] << 8) |
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(count[2] << 16) | (count[3] << 24);
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g_ref = CLK32K_TEST_REF_CLK * (CLK32K_TEST_LEN + 1);
|
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if (counts > g_ref) {
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trim_dir = 0;
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camp = 36ULL * (32768 * (counts - g_ref));
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do_div(camp, (g_ref / 100));
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} else {
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trim_dir = CLK32K_COMP_DIR_ADD;
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camp = 36ULL * (32768 * (g_ref - counts));
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do_div(camp, (g_ref / 100));
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}
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tcamp = (u32)camp;
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c_hour = DIV_ROUND_CLOSEST(tcamp, 32768);
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c_day = DIV_ROUND_CLOSEST(24 * tcamp, 32768);
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c_mon = DIV_ROUND_CLOSEST(30 * 24 * tcamp, 32768);
|
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if (c_hour > 1)
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regmap_write(rk630->rtc, RTC_COMP_H, bin2bcd((c_hour - 1)) | trim_dir);
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else
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regmap_write(rk630->rtc, RTC_COMP_H, CLK32K_NO_COMP);
|
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if (c_day > c_hour * 23) {
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c_det_day = c_day - c_hour * 23;
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trim_dir = CLK32K_COMP_DIR_ADD;
|
} else {
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c_det_day = c_hour * 24 - c_day;
|
trim_dir = 0;
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}
|
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if (c_det_day > 1)
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regmap_write(rk630->rtc, RTC_COMP_D,
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bin2bcd((c_det_day - 1)) | trim_dir);
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else
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regmap_write(rk630->rtc, RTC_COMP_D, CLK32K_NO_COMP);
|
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if (c_mon > (29 * c_day + 23 * c_hour)) {
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c_det_mon = c_mon - 29 * c_day - 23 * c_hour;
|
trim_dir = CLK32K_COMP_DIR_ADD;
|
} else {
|
c_det_mon = 29 * c_day + 23 * c_hour - c_mon;
|
trim_dir = 0;
|
}
|
|
if (c_det_mon)
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regmap_write(rk630->rtc, RTC_COMP_M,
|
bin2bcd((c_det_mon - 1)) | trim_dir);
|
else
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regmap_write(rk630->rtc, RTC_COMP_M, CLK32K_NO_COMP);
|
|
ret = regmap_read(rk630->rtc, RTC_CTRL, &done);
|
if (ret) {
|
dev_err(dev, "Failed to read RTC_CTRL: %d\n",
|
ret);
|
return ret;
|
}
|
|
ret = regmap_update_bits(rk630->rtc, RTC_CTRL,
|
CLK32K_COMP_EN,
|
CLK32K_COMP_EN);
|
if (ret) {
|
dev_err(dev,
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"%s:Failed to update RTC CTRL : %d\n", __func__, ret);
|
return ret;
|
}
|
return 0;
|
}
|
|
/* Enable the alarm if it should be enabled (in case it was disabled to
|
* prevent use as a wake source).
|
*/
|
#ifdef CONFIG_PM_SLEEP
|
/* Turn off the alarm if it should not be a wake source. */
|
static int rk630_rtc_suspend(struct device *dev)
|
{
|
struct platform_device *pdev = to_platform_device(dev);
|
struct rk630_rtc *rk630_rtc = dev_get_drvdata(&pdev->dev);
|
|
if (device_may_wakeup(dev))
|
enable_irq_wake(rk630_rtc->irq);
|
|
regmap_write(rk630_rtc->rk630->grf,
|
PLUMAGE_GRF_SOC_CON0,
|
RTC_CLAMP_EN(0));
|
|
return 0;
|
}
|
|
/* Enable the alarm if it should be enabled (in case it was disabled to
|
* prevent use as a wake source).
|
*/
|
static int rk630_rtc_resume(struct device *dev)
|
{
|
struct platform_device *pdev = to_platform_device(dev);
|
struct rk630_rtc *rk630_rtc = dev_get_drvdata(&pdev->dev);
|
|
if (device_may_wakeup(dev))
|
disable_irq_wake(rk630_rtc->irq);
|
|
regmap_write(rk630_rtc->rk630->grf,
|
PLUMAGE_GRF_SOC_CON0,
|
RTC_CLAMP_EN(1));
|
|
return 0;
|
}
|
#endif
|
|
static SIMPLE_DEV_PM_OPS(rk630_rtc_pm_ops, rk630_rtc_suspend, rk630_rtc_resume);
|
|
static int rk630_rtc_probe(struct platform_device *pdev)
|
{
|
struct rk630 *rk630 = dev_get_drvdata(pdev->dev.parent);
|
struct rk630_rtc *rk630_rtc;
|
int ret;
|
struct rtc_time tm_read, tm = {
|
.tm_wday = 0,
|
.tm_year = 121,
|
.tm_mon = 0,
|
.tm_mday = 1,
|
.tm_hour = 12,
|
.tm_min = 0,
|
.tm_sec = 0,
|
};
|
|
rk630_rtc = devm_kzalloc(&pdev->dev, sizeof(*rk630_rtc), GFP_KERNEL);
|
if (!rk630_rtc)
|
return -ENOMEM;
|
|
platform_set_drvdata(pdev, rk630_rtc);
|
rk630_rtc->rk630 = rk630;
|
|
regmap_write(rk630->grf, PLUMAGE_GRF_SOC_CON0, RTC_CLAMP_EN(1));
|
/* setting d2a_lp_xo_start_mir */
|
regmap_write(rk630->rtc, RTC_XO_TRIM0, RTC_XO_START_MIR);
|
regmap_write(rk630->rtc, RTC_ANALOG_TEST, RTC_VREF_INIT);
|
|
rk630_rtc_compensation(&pdev->dev);
|
|
/* start rtc running by default, and use shadowed timer. */
|
ret = regmap_update_bits(rk630->rtc, RTC_CTRL,
|
RTC_CTRL_REG_RTC_READSEL_M |
|
RTC_CTRL_REG_START_RTC,
|
RTC_CTRL_REG_RTC_READSEL_M |
|
RTC_CTRL_REG_START_RTC);
|
if (ret) {
|
dev_err(&pdev->dev,
|
"Failed to write RTC control: %d\n", ret);
|
return ret;
|
}
|
|
ret = regmap_write(rk630->rtc, RTC_STATUS0,
|
RTC_STATUS_MASK);
|
if (ret) {
|
dev_err(&pdev->dev,
|
"Failed to write RTC status0: %d\n", ret);
|
return ret;
|
}
|
|
ret = regmap_write(rk630->rtc, RTC_STATUS0, 0);
|
if (ret) {
|
dev_err(&pdev->dev,
|
"Failed to write RTC status0: %d\n", ret);
|
return ret;
|
}
|
|
device_init_wakeup(&pdev->dev, 1);
|
|
rk630_rtc_readtime(&pdev->dev, &tm_read);
|
if (rtc_valid_tm(&tm_read) != 0)
|
rk630_rtc_set_time(&pdev->dev, &tm);
|
|
rk630_rtc->rtc = devm_rtc_allocate_device(&pdev->dev);
|
if (IS_ERR(rk630_rtc->rtc))
|
return PTR_ERR(rk630_rtc->rtc);
|
|
rk630_rtc->rtc->ops = &rk630_rtc_ops;
|
|
/* request alarm irq of rk630 */
|
ret = devm_request_threaded_irq(&pdev->dev, rk630->irq, NULL,
|
rk630_alarm_irq,
|
IRQF_TRIGGER_LOW | IRQF_ONESHOT |
|
IRQF_SHARED,
|
"RTC alarm", rk630_rtc);
|
if (ret) {
|
dev_err(&pdev->dev, "Failed to request alarm IRQ %d: %d\n",
|
rk630_rtc->irq, ret);
|
return ret;
|
}
|
|
return rtc_register_device(rk630_rtc->rtc);
|
}
|
|
static struct platform_driver rk630_rtc_driver = {
|
.probe = rk630_rtc_probe,
|
.driver = {
|
.name = "rk630-rtc",
|
.pm = &rk630_rtc_pm_ops,
|
},
|
};
|
|
module_platform_driver(rk630_rtc_driver);
|
|
MODULE_DESCRIPTION("RTC driver for the rk630");
|
MODULE_AUTHOR("Zhang Qing <zhangqing@rock-chips.com>");
|
MODULE_LICENSE("GPL");
|
