376 lines
10 KiB
C
Executable File
376 lines
10 KiB
C
Executable File
/*
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* ms_rtc.c- Sigmastar
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*
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* Copyright (c) [2019~2020] SigmaStar Technology.
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*
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License version 2 for more details.
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*
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*/
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#include <linux/platform_device.h>
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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/rtc.h>
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#include <linux/clk.h>
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#include <linux/clk-provider.h>
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#include <linux/ctype.h>
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#include "ms_platform.h"
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#include "ms_types.h"
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#include "ms_msys.h"
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#define RTC_DEBUG 0
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#if RTC_DEBUG
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#define RTC_DBG(fmt, arg...) printk(KERN_INFO fmt, ##arg)
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#else
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#define RTC_DBG(fmt, arg...)
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#endif
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#define RTC_ERR(fmt, arg...) printk(KERN_ERR fmt, ##arg)
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#define REG_RTC_CTRL 0x00
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#define SOFT_RSTZ_BIT BIT0
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#define CNT_EN_BIT BIT1
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#define WRAP_EN_BIT BIT2
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#define LOAD_EN_BIT BIT3
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#define READ_EN_BIT BIT4
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#define INT_MASK_BIT BIT5
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#define INT_FORCE_BIT BIT6
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#define INT_CLEAR_BIT BIT7
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#define REG_RTC_FREQ_CW_L 0x04
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#define REG_RTC_FREQ_CW_H 0x08
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#define REG_RTC_LOAD_VAL_L 0x0C
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#define REG_RTC_LOAD_VAL_H 0x10
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#define REG_RTC_MATCH_VAL_L 0x14
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#define REG_RTC_MATCH_VAL_H 0x18
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#define REG_RTC_CNT_VAL_L 0x20
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#define REG_RTC_CNT_VAL_H 0x24
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struct ms_rtc_info {
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struct platform_device *pdev;
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struct rtc_device *rtc_dev;
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struct device* rtc_devnode;
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void __iomem *rtc_base;
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};
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int auto_wakeup_delay_seconds = 0;
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static ssize_t auto_wakeup_timer_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t n)
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{
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if(NULL!=buf)
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{
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size_t len;
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const char *str = buf;
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while (*str && !isspace(*str)) str++;
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len = str - buf;
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if(len)
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{
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auto_wakeup_delay_seconds = simple_strtoul(buf, NULL, 10);
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//printk("\nauto_wakeup_delay_seconds=%d\n", auto_wakeup_delay_seconds);
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return n;
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}
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return -EINVAL;
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}
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return -EINVAL;
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}
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static ssize_t auto_wakeup_timer_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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char *str = buf;
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char *end = buf + PAGE_SIZE;
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str += scnprintf(str, end - str, "%d\n", auto_wakeup_delay_seconds);
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return (str - buf);
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}
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DEVICE_ATTR(auto_wakeup_timer, 0644, auto_wakeup_timer_show, auto_wakeup_timer_store);
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static int ms_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
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{
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struct ms_rtc_info *info = dev_get_drvdata(dev);
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unsigned long seconds;
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seconds = readw(info->rtc_base + REG_RTC_MATCH_VAL_L) | (readw(info->rtc_base + REG_RTC_MATCH_VAL_H) << 16);
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rtc_time_to_tm(seconds, &alarm->time);
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if( !(readw(info->rtc_base + REG_RTC_CTRL) & INT_MASK_BIT) )
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alarm->enabled = 1;
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RTC_DBG("ms_rtc_read_alarm[%d,%d,%d,%d,%d,%d], alarm_en=%d\n",
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alarm->time.tm_year,alarm->time.tm_mon,alarm->time.tm_mday,alarm->time.tm_hour,alarm->time.tm_min,alarm->time.tm_sec, alarm->enabled);
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return 0;
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}
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static int ms_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
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{
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struct ms_rtc_info *info = dev_get_drvdata(dev);
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unsigned long seconds;
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u16 reg;
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RTC_DBG("ms_rtc_set_alarm[%d,%d,%d,%d,%d,%d], alarm_en=%d\n",
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alarm->time.tm_year,alarm->time.tm_mon,alarm->time.tm_mday,alarm->time.tm_hour,alarm->time.tm_min,alarm->time.tm_sec, alarm->enabled);
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rtc_tm_to_time(&alarm->time, &seconds);
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writew((seconds & 0xFFFF), info->rtc_base + REG_RTC_MATCH_VAL_L);
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writew((seconds>>16) & 0xFFFF, info->rtc_base + REG_RTC_MATCH_VAL_H);
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reg = readw(info->rtc_base + REG_RTC_CTRL);
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if(alarm->enabled)
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{
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writew(reg & ~(INT_MASK_BIT), info->rtc_base + REG_RTC_CTRL);
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}
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else
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{
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writew(reg | INT_MASK_BIT, info->rtc_base + REG_RTC_CTRL);
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}
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return 0;
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}
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static int ms_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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struct ms_rtc_info *info = dev_get_drvdata(dev);
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unsigned long seconds;
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u16 reg;
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reg = readw(info->rtc_base + REG_RTC_CTRL);
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writew(reg | READ_EN_BIT, info->rtc_base + REG_RTC_CTRL);
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while(readw(info->rtc_base + REG_RTC_CTRL) & READ_EN_BIT); //wait for HW latch done
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seconds = readw(info->rtc_base + REG_RTC_CNT_VAL_L) | (readw(info->rtc_base + REG_RTC_CNT_VAL_H) << 16);
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rtc_time_to_tm(seconds, tm);
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RTC_DBG("ms_rtc_read_time[%d,%d,%d,%d,%d,%d]\n",
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tm->tm_year,tm->tm_mon,tm->tm_mday,tm->tm_hour,tm->tm_min,tm->tm_sec);
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return rtc_valid_tm(tm);
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}
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static int ms_rtc_set_time(struct device *dev, struct rtc_time *tm)
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{
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struct ms_rtc_info *info = dev_get_drvdata(dev);
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unsigned long seconds;
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u16 reg;
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RTC_DBG("ms_rtc_set_time[%d,%d,%d,%d,%d,%d]\n",
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tm->tm_year,tm->tm_mon,tm->tm_mday,tm->tm_hour,tm->tm_min,tm->tm_sec);
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rtc_tm_to_time(tm, &seconds);
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writew(seconds & 0xFFFF, info->rtc_base + REG_RTC_LOAD_VAL_L);
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writew((seconds >> 16) & 0xFFFF, info->rtc_base + REG_RTC_LOAD_VAL_H);
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reg = readw(info->rtc_base + REG_RTC_CTRL);
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writew(reg | LOAD_EN_BIT, info->rtc_base + REG_RTC_CTRL);
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/* need to check carefully if we want to clear REG_RTC_LOAD_VAL_H for customer*/
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while(readw(info->rtc_base + REG_RTC_CTRL) & LOAD_EN_BIT);
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writew(0, info->rtc_base + REG_RTC_LOAD_VAL_H);
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return 0;
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}
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static const struct rtc_class_ops ms_rtc_ops = {
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.read_time = ms_rtc_read_time,
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.set_time = ms_rtc_set_time,
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.read_alarm = ms_rtc_read_alarm,
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.set_alarm = ms_rtc_set_alarm,
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};
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static irqreturn_t ms_rtc_interrupt(s32 irq, void *dev_id)
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{
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struct ms_rtc_info *info = dev_get_drvdata(dev_id);
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u16 reg;
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reg = readw(info->rtc_base + REG_RTC_CTRL);
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reg |= INT_CLEAR_BIT;
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writew(reg, info->rtc_base + REG_RTC_CTRL);
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RTC_DBG("RTC INTERRUPT\n");
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return IRQ_HANDLED;
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}
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#ifdef CONFIG_PM
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static s32 ms_rtc_suspend(struct platform_device *pdev, pm_message_t state)
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{
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if(auto_wakeup_delay_seconds)
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{
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struct rtc_time tm;
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struct rtc_wkalrm alarm;
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unsigned long seconds;
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ms_rtc_read_time(&pdev->dev, &tm);
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rtc_tm_to_time(&tm, &seconds);
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RTC_DBG("[%s]: Ready to use RTC alarm, time=%ld\n", __func__, seconds);
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seconds += auto_wakeup_delay_seconds;
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rtc_time_to_tm(seconds, &alarm.time);
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alarm.enabled=1;
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ms_rtc_set_alarm(&pdev->dev, &alarm);
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}
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return 0;
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}
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static s32 ms_rtc_resume(struct platform_device *pdev)
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{
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return 0;
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}
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#endif
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static int ms_rtc_remove(struct platform_device *pdev)
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{
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struct clk *clk = of_clk_get(pdev->dev.of_node, 0);
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int ret = 0;
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if(IS_ERR(clk))
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{
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ret = PTR_ERR(clk);
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RTC_ERR("[%s]: of_clk_get failed\n", __func__);
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return ret;
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}
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clk_disable_unprepare(clk);
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clk_put(clk);
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return 0;
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}
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static int ms_rtc_probe(struct platform_device *pdev)
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{
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struct ms_rtc_info *info;
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struct resource *res;
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struct clk *clk;
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dev_t dev;
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int ret = 0;
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u16 reg;
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u32 rate;
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int rc;
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info = devm_kzalloc(&pdev->dev, sizeof(struct ms_rtc_info), GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res)
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{
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RTC_ERR("[%s]: failed to get IORESOURCE_MEM\n", __func__);
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return -ENODEV;
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}
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info->rtc_base = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(info->rtc_base))
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return PTR_ERR(info->rtc_base);
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info->pdev = pdev;
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res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
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if (!res)
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{
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RTC_ERR("[%s]: failed to get IORESOURCE_IRQ\n", __func__);
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return -ENODEV;
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}
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rc = request_irq(res->start, ms_rtc_interrupt, IRQF_SHARED, "ms_rtc", &pdev->dev);
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if (rc)
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{
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RTC_ERR("[%s]: request_irq()is failed. return code=%d\n", __func__, rc);
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}
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platform_set_drvdata(pdev, info);
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info->rtc_dev = devm_rtc_device_register(&pdev->dev,
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dev_name(&pdev->dev), &ms_rtc_ops,
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THIS_MODULE);
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if (IS_ERR(info->rtc_dev)) {
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ret = PTR_ERR(info->rtc_dev);
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RTC_ERR("[%s]: unable to register device (err=%d).\n", __func__, ret);
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return ret;
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}
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//Note: is it needed?
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//device_set_wakeup_capable(&pdev->dev, 1);
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//device_wakeup_enable(&pdev->dev);
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//init rtc
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RTC_DBG("[%s]: hardware initialize\n", __func__);
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//1. release reset
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reg = readw(info->rtc_base + REG_RTC_CTRL);
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if( !(reg & SOFT_RSTZ_BIT) )
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{
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reg |= SOFT_RSTZ_BIT;
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writew(reg, info->rtc_base + REG_RTC_CTRL);
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}
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//2. set frequency
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clk = of_clk_get(pdev->dev.of_node, 0);
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if(IS_ERR(clk))
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{
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ret = PTR_ERR(clk);
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RTC_ERR("[%s]: of_clk_get failed\n", __func__);
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return ret;
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}
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/* Try to determine the frequency from the device tree */
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if (of_property_read_u32(pdev->dev.of_node, "clock-frequency", &rate))
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{
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rate = clk_get_rate(clk);
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}
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else
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{
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clk_set_rate(clk, rate);
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}
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clk_prepare_enable(clk);
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RTC_ERR("[%s]: rtc setup, frequency=%lu\n", __func__, clk_get_rate(clk));
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writew(rate & 0xFFFF, info->rtc_base + REG_RTC_FREQ_CW_L);
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writew((rate >>16) & 0xFFFF, info->rtc_base + REG_RTC_FREQ_CW_H);
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//3. enable counter
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reg |= CNT_EN_BIT;
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writew(reg, info->rtc_base + REG_RTC_CTRL);
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if (0 != (ret = alloc_chrdev_region(&dev, 0, 1, "ms_rtc")))
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return ret;
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info->rtc_devnode = device_create(msys_get_sysfs_class(), NULL, dev, NULL, "ms_rtc");
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device_create_file(info->rtc_devnode, &dev_attr_auto_wakeup_timer);
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clk_put(clk);
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return ret;
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}
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static const struct of_device_id ms_rtc_of_match_table[] = {
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{ .compatible = "sstar,infinity-rtc" },
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{}
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};
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MODULE_DEVICE_TABLE(of, ms_rtc_of_match_table);
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static struct platform_driver ms_rtc_driver = {
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.remove = ms_rtc_remove,
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.probe = ms_rtc_probe,
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#ifdef CONFIG_PM
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.suspend = ms_rtc_suspend,
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.resume = ms_rtc_resume,
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#endif
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.driver = {
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.name = "ms_rtc",
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.owner = THIS_MODULE,
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.of_match_table = ms_rtc_of_match_table,
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},
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};
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module_platform_driver(ms_rtc_driver);
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MODULE_AUTHOR("SSTAR");
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MODULE_DESCRIPTION("MStar RTC Driver");
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MODULE_LICENSE("GPL v2");
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