616 lines
14 KiB
C
616 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* drivers/rtc/rtc-s3c.c
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*
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* Copyright (c) 2010 Samsung Electronics Co., Ltd.
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* http://www.samsung.com/
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*
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* Copyright (c) 2004,2006 Simtec Electronics
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* Ben Dooks, <ben@simtec.co.uk>
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* http://armlinux.simtec.co.uk/
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*
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* S3C2410/S3C2440/S3C24XX Internal RTC Driver
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*/
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/string.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/interrupt.h>
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#include <linux/rtc.h>
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#include <linux/bcd.h>
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#include <linux/clk.h>
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#include <linux/log2.h>
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#include <linux/slab.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/uaccess.h>
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#include <linux/io.h>
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#include <asm/irq.h>
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#include "rtc-s3c.h"
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struct s3c_rtc {
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struct device *dev;
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struct rtc_device *rtc;
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void __iomem *base;
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struct clk *rtc_clk;
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struct clk *rtc_src_clk;
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bool alarm_enabled;
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const struct s3c_rtc_data *data;
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int irq_alarm;
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spinlock_t alarm_lock;
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bool wake_en;
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};
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struct s3c_rtc_data {
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bool needs_src_clk;
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void (*irq_handler) (struct s3c_rtc *info, int mask);
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void (*enable) (struct s3c_rtc *info);
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void (*disable) (struct s3c_rtc *info);
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};
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static int s3c_rtc_enable_clk(struct s3c_rtc *info)
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{
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int ret;
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ret = clk_enable(info->rtc_clk);
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if (ret)
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return ret;
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if (info->data->needs_src_clk) {
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ret = clk_enable(info->rtc_src_clk);
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if (ret) {
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clk_disable(info->rtc_clk);
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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 void s3c_rtc_disable_clk(struct s3c_rtc *info)
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{
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if (info->data->needs_src_clk)
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clk_disable(info->rtc_src_clk);
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clk_disable(info->rtc_clk);
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}
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/* IRQ Handler */
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static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
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{
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struct s3c_rtc *info = (struct s3c_rtc *)id;
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if (info->data->irq_handler)
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info->data->irq_handler(info, S3C2410_INTP_ALM);
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return IRQ_HANDLED;
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}
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/* Update control registers */
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static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
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{
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struct s3c_rtc *info = dev_get_drvdata(dev);
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unsigned long flags;
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unsigned int tmp;
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int ret;
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dev_dbg(info->dev, "%s: aie=%d\n", __func__, enabled);
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ret = s3c_rtc_enable_clk(info);
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if (ret)
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return ret;
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tmp = readb(info->base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
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if (enabled)
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tmp |= S3C2410_RTCALM_ALMEN;
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writeb(tmp, info->base + S3C2410_RTCALM);
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spin_lock_irqsave(&info->alarm_lock, flags);
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if (info->alarm_enabled && !enabled)
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s3c_rtc_disable_clk(info);
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else if (!info->alarm_enabled && enabled)
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ret = s3c_rtc_enable_clk(info);
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info->alarm_enabled = enabled;
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spin_unlock_irqrestore(&info->alarm_lock, flags);
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s3c_rtc_disable_clk(info);
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return ret;
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}
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/* Read time from RTC and convert it from BCD */
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static int s3c_rtc_read_time(struct s3c_rtc *info, struct rtc_time *tm)
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{
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unsigned int have_retried = 0;
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int ret;
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ret = s3c_rtc_enable_clk(info);
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if (ret)
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return ret;
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retry_get_time:
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tm->tm_min = readb(info->base + S3C2410_RTCMIN);
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tm->tm_hour = readb(info->base + S3C2410_RTCHOUR);
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tm->tm_mday = readb(info->base + S3C2410_RTCDATE);
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tm->tm_mon = readb(info->base + S3C2410_RTCMON);
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tm->tm_year = readb(info->base + S3C2410_RTCYEAR);
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tm->tm_sec = readb(info->base + S3C2410_RTCSEC);
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/*
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* The only way to work out whether the system was mid-update
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* when we read it is to check the second counter, and if it
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* is zero, then we re-try the entire read
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*/
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if (tm->tm_sec == 0 && !have_retried) {
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have_retried = 1;
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goto retry_get_time;
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}
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s3c_rtc_disable_clk(info);
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tm->tm_sec = bcd2bin(tm->tm_sec);
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tm->tm_min = bcd2bin(tm->tm_min);
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tm->tm_hour = bcd2bin(tm->tm_hour);
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tm->tm_mday = bcd2bin(tm->tm_mday);
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tm->tm_mon = bcd2bin(tm->tm_mon);
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tm->tm_year = bcd2bin(tm->tm_year);
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return 0;
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}
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/* Convert time to BCD and write it to RTC */
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static int s3c_rtc_write_time(struct s3c_rtc *info, const struct rtc_time *tm)
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{
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int ret;
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ret = s3c_rtc_enable_clk(info);
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if (ret)
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return ret;
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writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_RTCSEC);
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writeb(bin2bcd(tm->tm_min), info->base + S3C2410_RTCMIN);
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writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_RTCHOUR);
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writeb(bin2bcd(tm->tm_mday), info->base + S3C2410_RTCDATE);
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writeb(bin2bcd(tm->tm_mon), info->base + S3C2410_RTCMON);
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writeb(bin2bcd(tm->tm_year), info->base + S3C2410_RTCYEAR);
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s3c_rtc_disable_clk(info);
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return 0;
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}
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static int s3c_rtc_gettime(struct device *dev, struct rtc_time *tm)
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{
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struct s3c_rtc *info = dev_get_drvdata(dev);
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int ret;
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ret = s3c_rtc_read_time(info, tm);
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if (ret)
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return ret;
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/* Convert internal representation to actual date/time */
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tm->tm_year += 100;
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tm->tm_mon -= 1;
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dev_dbg(dev, "read time %ptR\n", tm);
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return 0;
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}
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static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
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{
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struct s3c_rtc *info = dev_get_drvdata(dev);
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struct rtc_time rtc_tm = *tm;
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dev_dbg(dev, "set time %ptR\n", tm);
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/*
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* Convert actual date/time to internal representation.
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* We get around Y2K by simply not supporting it.
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*/
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rtc_tm.tm_year -= 100;
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rtc_tm.tm_mon += 1;
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return s3c_rtc_write_time(info, &rtc_tm);
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}
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static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct s3c_rtc *info = dev_get_drvdata(dev);
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struct rtc_time *alm_tm = &alrm->time;
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unsigned int alm_en;
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int ret;
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ret = s3c_rtc_enable_clk(info);
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if (ret)
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return ret;
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alm_tm->tm_sec = readb(info->base + S3C2410_ALMSEC);
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alm_tm->tm_min = readb(info->base + S3C2410_ALMMIN);
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alm_tm->tm_hour = readb(info->base + S3C2410_ALMHOUR);
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alm_tm->tm_mon = readb(info->base + S3C2410_ALMMON);
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alm_tm->tm_mday = readb(info->base + S3C2410_ALMDATE);
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alm_tm->tm_year = readb(info->base + S3C2410_ALMYEAR);
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alm_en = readb(info->base + S3C2410_RTCALM);
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s3c_rtc_disable_clk(info);
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alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0;
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dev_dbg(dev, "read alarm %d, %ptR\n", alm_en, alm_tm);
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/* decode the alarm enable field */
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if (alm_en & S3C2410_RTCALM_SECEN)
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alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec);
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if (alm_en & S3C2410_RTCALM_MINEN)
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alm_tm->tm_min = bcd2bin(alm_tm->tm_min);
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if (alm_en & S3C2410_RTCALM_HOUREN)
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alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour);
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if (alm_en & S3C2410_RTCALM_DAYEN)
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alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday);
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if (alm_en & S3C2410_RTCALM_MONEN) {
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alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon);
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alm_tm->tm_mon -= 1;
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}
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if (alm_en & S3C2410_RTCALM_YEAREN)
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alm_tm->tm_year = bcd2bin(alm_tm->tm_year);
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return 0;
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}
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static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct s3c_rtc *info = dev_get_drvdata(dev);
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struct rtc_time *tm = &alrm->time;
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unsigned int alrm_en;
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int ret;
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dev_dbg(dev, "s3c_rtc_setalarm: %d, %ptR\n", alrm->enabled, tm);
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ret = s3c_rtc_enable_clk(info);
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if (ret)
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return ret;
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alrm_en = readb(info->base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
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writeb(0x00, info->base + S3C2410_RTCALM);
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if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
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alrm_en |= S3C2410_RTCALM_SECEN;
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writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_ALMSEC);
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}
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if (tm->tm_min < 60 && tm->tm_min >= 0) {
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alrm_en |= S3C2410_RTCALM_MINEN;
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writeb(bin2bcd(tm->tm_min), info->base + S3C2410_ALMMIN);
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}
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if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
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alrm_en |= S3C2410_RTCALM_HOUREN;
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writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_ALMHOUR);
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}
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if (tm->tm_mon < 12 && tm->tm_mon >= 0) {
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alrm_en |= S3C2410_RTCALM_MONEN;
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writeb(bin2bcd(tm->tm_mon + 1), info->base + S3C2410_ALMMON);
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}
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if (tm->tm_mday <= 31 && tm->tm_mday >= 1) {
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alrm_en |= S3C2410_RTCALM_DAYEN;
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writeb(bin2bcd(tm->tm_mday), info->base + S3C2410_ALMDATE);
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}
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dev_dbg(dev, "setting S3C2410_RTCALM to %08x\n", alrm_en);
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writeb(alrm_en, info->base + S3C2410_RTCALM);
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s3c_rtc_setaie(dev, alrm->enabled);
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s3c_rtc_disable_clk(info);
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return 0;
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}
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static const struct rtc_class_ops s3c_rtcops = {
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.read_time = s3c_rtc_gettime,
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.set_time = s3c_rtc_settime,
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.read_alarm = s3c_rtc_getalarm,
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.set_alarm = s3c_rtc_setalarm,
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.alarm_irq_enable = s3c_rtc_setaie,
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};
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static void s3c24xx_rtc_enable(struct s3c_rtc *info)
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{
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unsigned int con, tmp;
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con = readw(info->base + S3C2410_RTCCON);
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/* re-enable the device, and check it is ok */
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if ((con & S3C2410_RTCCON_RTCEN) == 0) {
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dev_info(info->dev, "rtc disabled, re-enabling\n");
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tmp = readw(info->base + S3C2410_RTCCON);
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writew(tmp | S3C2410_RTCCON_RTCEN, info->base + S3C2410_RTCCON);
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}
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if (con & S3C2410_RTCCON_CNTSEL) {
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dev_info(info->dev, "removing RTCCON_CNTSEL\n");
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tmp = readw(info->base + S3C2410_RTCCON);
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writew(tmp & ~S3C2410_RTCCON_CNTSEL,
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info->base + S3C2410_RTCCON);
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}
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if (con & S3C2410_RTCCON_CLKRST) {
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dev_info(info->dev, "removing RTCCON_CLKRST\n");
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tmp = readw(info->base + S3C2410_RTCCON);
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writew(tmp & ~S3C2410_RTCCON_CLKRST,
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info->base + S3C2410_RTCCON);
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}
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}
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static void s3c24xx_rtc_disable(struct s3c_rtc *info)
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{
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unsigned int con;
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con = readw(info->base + S3C2410_RTCCON);
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con &= ~S3C2410_RTCCON_RTCEN;
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writew(con, info->base + S3C2410_RTCCON);
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con = readb(info->base + S3C2410_TICNT);
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con &= ~S3C2410_TICNT_ENABLE;
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writeb(con, info->base + S3C2410_TICNT);
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}
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static void s3c6410_rtc_disable(struct s3c_rtc *info)
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{
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unsigned int con;
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con = readw(info->base + S3C2410_RTCCON);
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con &= ~S3C64XX_RTCCON_TICEN;
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con &= ~S3C2410_RTCCON_RTCEN;
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writew(con, info->base + S3C2410_RTCCON);
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}
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static int s3c_rtc_remove(struct platform_device *pdev)
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{
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struct s3c_rtc *info = platform_get_drvdata(pdev);
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s3c_rtc_setaie(info->dev, 0);
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if (info->data->needs_src_clk)
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clk_unprepare(info->rtc_src_clk);
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clk_unprepare(info->rtc_clk);
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return 0;
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}
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static int s3c_rtc_probe(struct platform_device *pdev)
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{
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struct s3c_rtc *info = NULL;
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int ret;
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info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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info->dev = &pdev->dev;
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info->data = of_device_get_match_data(&pdev->dev);
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if (!info->data) {
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dev_err(&pdev->dev, "failed getting s3c_rtc_data\n");
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return -EINVAL;
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}
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spin_lock_init(&info->alarm_lock);
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platform_set_drvdata(pdev, info);
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info->irq_alarm = platform_get_irq(pdev, 0);
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if (info->irq_alarm < 0)
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return info->irq_alarm;
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dev_dbg(&pdev->dev, "s3c2410_rtc: alarm irq %d\n", info->irq_alarm);
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/* get the memory region */
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info->base = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(info->base))
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return PTR_ERR(info->base);
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info->rtc_clk = devm_clk_get(&pdev->dev, "rtc");
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if (IS_ERR(info->rtc_clk))
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return dev_err_probe(&pdev->dev, PTR_ERR(info->rtc_clk),
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"failed to find rtc clock\n");
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ret = clk_prepare_enable(info->rtc_clk);
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if (ret)
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return ret;
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if (info->data->needs_src_clk) {
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info->rtc_src_clk = devm_clk_get(&pdev->dev, "rtc_src");
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if (IS_ERR(info->rtc_src_clk)) {
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ret = dev_err_probe(&pdev->dev, PTR_ERR(info->rtc_src_clk),
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"failed to find rtc source clock\n");
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goto err_src_clk;
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}
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ret = clk_prepare_enable(info->rtc_src_clk);
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if (ret)
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goto err_src_clk;
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}
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/* disable RTC enable bits potentially set by the bootloader */
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if (info->data->disable)
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info->data->disable(info);
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/* check to see if everything is setup correctly */
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if (info->data->enable)
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info->data->enable(info);
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dev_dbg(&pdev->dev, "s3c2410_rtc: RTCCON=%02x\n",
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readw(info->base + S3C2410_RTCCON));
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device_init_wakeup(&pdev->dev, 1);
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info->rtc = devm_rtc_allocate_device(&pdev->dev);
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if (IS_ERR(info->rtc)) {
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ret = PTR_ERR(info->rtc);
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goto err_nortc;
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}
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info->rtc->ops = &s3c_rtcops;
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info->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
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info->rtc->range_max = RTC_TIMESTAMP_END_2099;
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ret = devm_rtc_register_device(info->rtc);
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if (ret)
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goto err_nortc;
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ret = devm_request_irq(&pdev->dev, info->irq_alarm, s3c_rtc_alarmirq,
|
|
0, "s3c2410-rtc alarm", info);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_alarm, ret);
|
|
goto err_nortc;
|
|
}
|
|
|
|
s3c_rtc_disable_clk(info);
|
|
|
|
return 0;
|
|
|
|
err_nortc:
|
|
if (info->data->disable)
|
|
info->data->disable(info);
|
|
|
|
if (info->data->needs_src_clk)
|
|
clk_disable_unprepare(info->rtc_src_clk);
|
|
err_src_clk:
|
|
clk_disable_unprepare(info->rtc_clk);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
|
|
static int s3c_rtc_suspend(struct device *dev)
|
|
{
|
|
struct s3c_rtc *info = dev_get_drvdata(dev);
|
|
int ret;
|
|
|
|
ret = s3c_rtc_enable_clk(info);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (info->data->disable)
|
|
info->data->disable(info);
|
|
|
|
if (device_may_wakeup(dev) && !info->wake_en) {
|
|
if (enable_irq_wake(info->irq_alarm) == 0)
|
|
info->wake_en = true;
|
|
else
|
|
dev_err(dev, "enable_irq_wake failed\n");
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int s3c_rtc_resume(struct device *dev)
|
|
{
|
|
struct s3c_rtc *info = dev_get_drvdata(dev);
|
|
|
|
if (info->data->enable)
|
|
info->data->enable(info);
|
|
|
|
s3c_rtc_disable_clk(info);
|
|
|
|
if (device_may_wakeup(dev) && info->wake_en) {
|
|
disable_irq_wake(info->irq_alarm);
|
|
info->wake_en = false;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
static SIMPLE_DEV_PM_OPS(s3c_rtc_pm_ops, s3c_rtc_suspend, s3c_rtc_resume);
|
|
|
|
static void s3c24xx_rtc_irq(struct s3c_rtc *info, int mask)
|
|
{
|
|
rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF);
|
|
}
|
|
|
|
static void s3c6410_rtc_irq(struct s3c_rtc *info, int mask)
|
|
{
|
|
rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF);
|
|
writeb(mask, info->base + S3C2410_INTP);
|
|
}
|
|
|
|
static struct s3c_rtc_data const s3c2410_rtc_data = {
|
|
.irq_handler = s3c24xx_rtc_irq,
|
|
.enable = s3c24xx_rtc_enable,
|
|
.disable = s3c24xx_rtc_disable,
|
|
};
|
|
|
|
static struct s3c_rtc_data const s3c2416_rtc_data = {
|
|
.irq_handler = s3c24xx_rtc_irq,
|
|
.enable = s3c24xx_rtc_enable,
|
|
.disable = s3c24xx_rtc_disable,
|
|
};
|
|
|
|
static struct s3c_rtc_data const s3c2443_rtc_data = {
|
|
.irq_handler = s3c24xx_rtc_irq,
|
|
.enable = s3c24xx_rtc_enable,
|
|
.disable = s3c24xx_rtc_disable,
|
|
};
|
|
|
|
static struct s3c_rtc_data const s3c6410_rtc_data = {
|
|
.needs_src_clk = true,
|
|
.irq_handler = s3c6410_rtc_irq,
|
|
.enable = s3c24xx_rtc_enable,
|
|
.disable = s3c6410_rtc_disable,
|
|
};
|
|
|
|
static const __maybe_unused struct of_device_id s3c_rtc_dt_match[] = {
|
|
{
|
|
.compatible = "samsung,s3c2410-rtc",
|
|
.data = &s3c2410_rtc_data,
|
|
}, {
|
|
.compatible = "samsung,s3c2416-rtc",
|
|
.data = &s3c2416_rtc_data,
|
|
}, {
|
|
.compatible = "samsung,s3c2443-rtc",
|
|
.data = &s3c2443_rtc_data,
|
|
}, {
|
|
.compatible = "samsung,s3c6410-rtc",
|
|
.data = &s3c6410_rtc_data,
|
|
}, {
|
|
.compatible = "samsung,exynos3250-rtc",
|
|
.data = &s3c6410_rtc_data,
|
|
},
|
|
{ /* sentinel */ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, s3c_rtc_dt_match);
|
|
|
|
static struct platform_driver s3c_rtc_driver = {
|
|
.probe = s3c_rtc_probe,
|
|
.remove = s3c_rtc_remove,
|
|
.driver = {
|
|
.name = "s3c-rtc",
|
|
.pm = &s3c_rtc_pm_ops,
|
|
.of_match_table = of_match_ptr(s3c_rtc_dt_match),
|
|
},
|
|
};
|
|
module_platform_driver(s3c_rtc_driver);
|
|
|
|
MODULE_DESCRIPTION("Samsung S3C RTC Driver");
|
|
MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:s3c2410-rtc");
|