--- /dev/null
+/* drivers/rtc/rtc-s3c.c
+ *
+ * Copyright (c) 2010 Samsung Electronics Co., Ltd.
+ * http://www.samsung.com/
+ *
+ * Copyright (c) 2004,2006 Simtec Electronics
+ * Ben Dooks, <ben@simtec.co.uk>
+ * http://armlinux.simtec.co.uk/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * S3C2410/S3C2440/S3C24XX Internal RTC Driver
+*/
+
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/string.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/rtc.h>
+#include <linux/bcd.h>
+#include <linux/clk.h>
+#include <linux/log2.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/uaccess.h>
+#include <linux/io.h>
+
+#include <asm/irq.h>
+#include "rtc-s3c.h"
+
+struct s3c_rtc {
+ struct device *dev;
+ struct rtc_device *rtc;
+
+ void __iomem *base;
+ struct clk *rtc_clk;
+ struct clk *rtc_src_clk;
+
+ struct s3c_rtc_data *data;
+
+ int irq_alarm;
+ int irq_tick;
+
+ spinlock_t pie_lock;
+ spinlock_t alarm_clk_lock;
+
+ int ticnt_save, ticnt_en_save;
+ bool wake_en;
+};
+
+struct s3c_rtc_data {
+ int max_user_freq;
+ bool needs_src_clk;
+
+ void (*irq_handler) (struct s3c_rtc *info, int mask);
+ void (*set_freq) (struct s3c_rtc *info, int freq);
+ void (*enable_tick) (struct s3c_rtc *info, struct seq_file *seq);
+ void (*select_tick_clk) (struct s3c_rtc *info);
+ void (*save_tick_cnt) (struct s3c_rtc *info);
+ void (*restore_tick_cnt) (struct s3c_rtc *info);
+ void (*enable) (struct s3c_rtc *info);
+ void (*disable) (struct s3c_rtc *info);
+};
+
+static void s3c_rtc_enable_clk(struct s3c_rtc *info)
+{
+ unsigned long irq_flags;
+
+ spin_lock_irqsave(&info->alarm_clk_lock, irq_flags);
+ clk_enable(info->rtc_clk);
+ if (info->data->needs_src_clk)
+ clk_enable(info->rtc_src_clk);
+ spin_unlock_irqrestore(&info->alarm_clk_lock, irq_flags);
+}
+
+static void s3c_rtc_disable_clk(struct s3c_rtc *info)
+{
+ unsigned long irq_flags;
+
+ spin_lock_irqsave(&info->alarm_clk_lock, irq_flags);
+ if (info->data->needs_src_clk)
+ clk_disable(info->rtc_src_clk);
+ clk_disable(info->rtc_clk);
+ spin_unlock_irqrestore(&info->alarm_clk_lock, irq_flags);
+}
+
+/* IRQ Handlers */
+static irqreturn_t s3c_rtc_tickirq(int irq, void *id)
+{
+ struct s3c_rtc *info = (struct s3c_rtc *)id;
+
+ if (info->data->irq_handler)
+ info->data->irq_handler(info, S3C2410_INTP_TIC);
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
+{
+ struct s3c_rtc *info = (struct s3c_rtc *)id;
+
+ if (info->data->irq_handler)
+ info->data->irq_handler(info, S3C2410_INTP_ALM);
+
+ return IRQ_HANDLED;
+}
+
+/* Update control registers */
+static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
+{
+ struct s3c_rtc *info = dev_get_drvdata(dev);
+ unsigned int tmp;
+
+ dev_dbg(info->dev, "%s: aie=%d\n", __func__, enabled);
+
+ s3c_rtc_enable_clk(info);
+
+ tmp = readb(info->base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
+
+ if (enabled)
+ tmp |= S3C2410_RTCALM_ALMEN;
+
+ writeb(tmp, info->base + S3C2410_RTCALM);
+
+ s3c_rtc_disable_clk(info);
+
+ return 0;
+}
+
+/* Set RTC frequency */
+static int s3c_rtc_setfreq(struct s3c_rtc *info, int freq)
+{
+ if (!is_power_of_2(freq))
+ return -EINVAL;
+
+ spin_lock_irq(&info->pie_lock);
+
+ if (info->data->set_freq)
+ info->data->set_freq(info, freq);
+
+ spin_unlock_irq(&info->pie_lock);
+
+ return 0;
+}
+
+/* Time read/write */
+static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
+{
+ struct s3c_rtc *info = dev_get_drvdata(dev);
+ unsigned int have_retried = 0;
+
+ s3c_rtc_enable_clk(info);
+
+ retry_get_time:
+ rtc_tm->tm_min = readb(info->base + S3C2410_RTCMIN);
+ rtc_tm->tm_hour = readb(info->base + S3C2410_RTCHOUR);
+ rtc_tm->tm_mday = readb(info->base + S3C2410_RTCDATE);
+ rtc_tm->tm_mon = readb(info->base + S3C2410_RTCMON);
+ rtc_tm->tm_year = readb(info->base + S3C2410_RTCYEAR);
+ rtc_tm->tm_sec = readb(info->base + S3C2410_RTCSEC);
+
+ /* the only way to work out whether the system was mid-update
+ * when we read it is to check the second counter, and if it
+ * is zero, then we re-try the entire read
+ */
+
+ if (rtc_tm->tm_sec == 0 && !have_retried) {
+ have_retried = 1;
+ goto retry_get_time;
+ }
+
+ rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
+ rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
+ rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
+ rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
+ rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
+ rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);
+
+ s3c_rtc_disable_clk(info);
+
+ rtc_tm->tm_year += 100;
+
+ dev_dbg(dev, "read time %04d.%02d.%02d %02d:%02d:%02d\n",
+ 1900 + rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday,
+ rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);
+
+ rtc_tm->tm_mon -= 1;
+
+ return rtc_valid_tm(rtc_tm);
+}
+
+static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
+{
+ struct s3c_rtc *info = dev_get_drvdata(dev);
+ int year = tm->tm_year - 100;
+
+ dev_dbg(dev, "set time %04d.%02d.%02d %02d:%02d:%02d\n",
+ 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
+ tm->tm_hour, tm->tm_min, tm->tm_sec);
+
+ /* we get around y2k by simply not supporting it */
+
+ if (year < 0 || year >= 100) {
+ dev_err(dev, "rtc only supports 100 years\n");
+ return -EINVAL;
+ }
+
+ s3c_rtc_enable_clk(info);
+
+ writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_RTCSEC);
+ writeb(bin2bcd(tm->tm_min), info->base + S3C2410_RTCMIN);
+ writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_RTCHOUR);
+ writeb(bin2bcd(tm->tm_mday), info->base + S3C2410_RTCDATE);
+ writeb(bin2bcd(tm->tm_mon + 1), info->base + S3C2410_RTCMON);
+ writeb(bin2bcd(year), info->base + S3C2410_RTCYEAR);
+
+ s3c_rtc_disable_clk(info);
+
+ return 0;
+}
+
+static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+ struct s3c_rtc *info = dev_get_drvdata(dev);
+ struct rtc_time *alm_tm = &alrm->time;
+ unsigned int alm_en;
+
+ s3c_rtc_enable_clk(info);
+
+ alm_tm->tm_sec = readb(info->base + S3C2410_ALMSEC);
+ alm_tm->tm_min = readb(info->base + S3C2410_ALMMIN);
+ alm_tm->tm_hour = readb(info->base + S3C2410_ALMHOUR);
+ alm_tm->tm_mon = readb(info->base + S3C2410_ALMMON);
+ alm_tm->tm_mday = readb(info->base + S3C2410_ALMDATE);
+ alm_tm->tm_year = readb(info->base + S3C2410_ALMYEAR);
+
+ alm_en = readb(info->base + S3C2410_RTCALM);
+
+ s3c_rtc_disable_clk(info);
+
+ alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0;
+
+ dev_dbg(dev, "read alarm %d, %04d.%02d.%02d %02d:%02d:%02d\n",
+ alm_en,
+ 1900 + alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday,
+ alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec);
+
+ /* decode the alarm enable field */
+ if (alm_en & S3C2410_RTCALM_SECEN)
+ alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec);
+ else
+ alm_tm->tm_sec = -1;
+
+ if (alm_en & S3C2410_RTCALM_MINEN)
+ alm_tm->tm_min = bcd2bin(alm_tm->tm_min);
+ else
+ alm_tm->tm_min = -1;
+
+ if (alm_en & S3C2410_RTCALM_HOUREN)
+ alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour);
+ else
+ alm_tm->tm_hour = -1;
+
+ if (alm_en & S3C2410_RTCALM_DAYEN)
+ alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday);
+ else
+ alm_tm->tm_mday = -1;
+
+ if (alm_en & S3C2410_RTCALM_MONEN) {
+ alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon);
+ alm_tm->tm_mon -= 1;
+ } else {
+ alm_tm->tm_mon = -1;
+ }
+
+ if (alm_en & S3C2410_RTCALM_YEAREN)
+ alm_tm->tm_year = bcd2bin(alm_tm->tm_year);
+ else
+ alm_tm->tm_year = -1;
+
+ return 0;
+}
+
+static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+ struct s3c_rtc *info = dev_get_drvdata(dev);
+ struct rtc_time *tm = &alrm->time;
+ unsigned int alrm_en;
+
+ dev_dbg(dev, "s3c_rtc_setalarm: %d, %04d.%02d.%02d %02d:%02d:%02d\n",
+ alrm->enabled,
+ 1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
+ tm->tm_hour, tm->tm_min, tm->tm_sec);
+
+ s3c_rtc_enable_clk(info);
+
+ alrm_en = readb(info->base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
+ writeb(0x00, info->base + S3C2410_RTCALM);
+
+ if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
+ alrm_en |= S3C2410_RTCALM_SECEN;
+ writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_ALMSEC);
+ }
+
+ if (tm->tm_min < 60 && tm->tm_min >= 0) {
+ alrm_en |= S3C2410_RTCALM_MINEN;
+ writeb(bin2bcd(tm->tm_min), info->base + S3C2410_ALMMIN);
+ }
+
+ if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
+ alrm_en |= S3C2410_RTCALM_HOUREN;
+ writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_ALMHOUR);
+ }
+
+ dev_dbg(dev, "setting S3C2410_RTCALM to %08x\n", alrm_en);
+
+ writeb(alrm_en, info->base + S3C2410_RTCALM);
+
+ s3c_rtc_disable_clk(info);
+
+ s3c_rtc_setaie(dev, alrm->enabled);
+
+ return 0;
+}
+
+static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
+{
+ struct s3c_rtc *info = dev_get_drvdata(dev);
+
+ s3c_rtc_enable_clk(info);
+
+ if (info->data->enable_tick)
+ info->data->enable_tick(info, seq);
+
+ s3c_rtc_disable_clk(info);
+
+ return 0;
+}
+
+static const struct rtc_class_ops s3c_rtcops = {
+ .read_time = s3c_rtc_gettime,
+ .set_time = s3c_rtc_settime,
+ .read_alarm = s3c_rtc_getalarm,
+ .set_alarm = s3c_rtc_setalarm,
+ .proc = s3c_rtc_proc,
+ .alarm_irq_enable = s3c_rtc_setaie,
+};
+
+static void s3c24xx_rtc_enable(struct s3c_rtc *info)
+{
+ unsigned int con, tmp;
+
+ con = readw(info->base + S3C2410_RTCCON);
+ /* re-enable the device, and check it is ok */
+ if ((con & S3C2410_RTCCON_RTCEN) == 0) {
+ dev_info(info->dev, "rtc disabled, re-enabling\n");
+
+ tmp = readw(info->base + S3C2410_RTCCON);
+ writew(tmp | S3C2410_RTCCON_RTCEN,
+ info->base + S3C2410_RTCCON);
+ }
+
+ if (con & S3C2410_RTCCON_CNTSEL) {
+ dev_info(info->dev, "removing RTCCON_CNTSEL\n");
+
+ tmp = readw(info->base + S3C2410_RTCCON);
+ writew(tmp & ~S3C2410_RTCCON_CNTSEL,
+ info->base + S3C2410_RTCCON);
+ }
+
+ if (con & S3C2410_RTCCON_CLKRST) {
+ dev_info(info->dev, "removing RTCCON_CLKRST\n");
+
+ tmp = readw(info->base + S3C2410_RTCCON);
+ writew(tmp & ~S3C2410_RTCCON_CLKRST,
+ info->base + S3C2410_RTCCON);
+ }
+}
+
+static void s3c24xx_rtc_disable(struct s3c_rtc *info)
+{
+ unsigned int con;
+
+ con = readw(info->base + S3C2410_RTCCON);
+ con &= ~S3C2410_RTCCON_RTCEN;
+ writew(con, info->base + S3C2410_RTCCON);
+
+ con = readb(info->base + S3C2410_TICNT);
+ con &= ~S3C2410_TICNT_ENABLE;
+ writeb(con, info->base + S3C2410_TICNT);
+}
+
+static void s3c6410_rtc_disable(struct s3c_rtc *info)
+{
+ unsigned int con;
+
+ con = readw(info->base + S3C2410_RTCCON);
+ con &= ~S3C64XX_RTCCON_TICEN;
+ con &= ~S3C2410_RTCCON_RTCEN;
+ writew(con, info->base + S3C2410_RTCCON);
+}
+
+static int s3c_rtc_remove(struct platform_device *pdev)
+{
+ struct s3c_rtc *info = platform_get_drvdata(pdev);
+
+ s3c_rtc_setaie(info->dev, 0);
+
+ clk_unprepare(info->rtc_clk);
+ info->rtc_clk = NULL;
+
+ return 0;
+}
+
+static const struct of_device_id s3c_rtc_dt_match[];
+
+static struct s3c_rtc_data *s3c_rtc_get_data(struct platform_device *pdev)
+{
+ const struct of_device_id *match;
+
+ match = of_match_node(s3c_rtc_dt_match, pdev->dev.of_node);
+ return (struct s3c_rtc_data *)match->data;
+}
+
+static int s3c_rtc_probe(struct platform_device *pdev)
+{
+ struct s3c_rtc *info = NULL;
+ struct rtc_time rtc_tm;
+ struct resource *res;
+ int ret;
+
+ info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
+ if (!info)
+ return -ENOMEM;
+
+ /* find the IRQs */
+ info->irq_tick = platform_get_irq(pdev, 1);
+ if (info->irq_tick < 0) {
+ dev_err(&pdev->dev, "no irq for rtc tick\n");
+ return info->irq_tick;
+ }
+
+ info->dev = &pdev->dev;
+ info->data = s3c_rtc_get_data(pdev);
+ if (!info->data) {
+ dev_err(&pdev->dev, "failed getting s3c_rtc_data\n");
+ return -EINVAL;
+ }
+ spin_lock_init(&info->pie_lock);
+ spin_lock_init(&info->alarm_clk_lock);
+
+ platform_set_drvdata(pdev, info);
+
+ info->irq_alarm = platform_get_irq(pdev, 0);
+ if (info->irq_alarm < 0) {
+ dev_err(&pdev->dev, "no irq for alarm\n");
+ return info->irq_alarm;
+ }
+
+ dev_dbg(&pdev->dev, "s3c2410_rtc: tick irq %d, alarm irq %d\n",
+ info->irq_tick, info->irq_alarm);
+
+ /* get the memory region */
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ info->base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(info->base))
+ return PTR_ERR(info->base);
+
+ info->rtc_clk = devm_clk_get(&pdev->dev, "rtc");
+ if (IS_ERR(info->rtc_clk)) {
+ dev_err(&pdev->dev, "failed to find rtc clock\n");
+ return PTR_ERR(info->rtc_clk);
+ }
+ clk_prepare_enable(info->rtc_clk);
+
+ if (info->data->needs_src_clk) {
+ info->rtc_src_clk = devm_clk_get(&pdev->dev, "rtc_src");
+ if (IS_ERR(info->rtc_src_clk)) {
+ dev_err(&pdev->dev,
+ "failed to find rtc source clock\n");
+ return PTR_ERR(info->rtc_src_clk);
+ }
+ clk_prepare_enable(info->rtc_src_clk);
+ }
+
+ /* check to see if everything is setup correctly */
+ if (info->data->enable)
+ info->data->enable(info);
+
+ dev_dbg(&pdev->dev, "s3c2410_rtc: RTCCON=%02x\n",
+ readw(info->base + S3C2410_RTCCON));
+
+ device_init_wakeup(&pdev->dev, 1);
+
+ /* Check RTC Time */
+ if (s3c_rtc_gettime(&pdev->dev, &rtc_tm)) {
+ rtc_tm.tm_year = 100;
+ rtc_tm.tm_mon = 0;
+ rtc_tm.tm_mday = 1;
+ rtc_tm.tm_hour = 0;
+ rtc_tm.tm_min = 0;
+ rtc_tm.tm_sec = 0;
+
+ s3c_rtc_settime(&pdev->dev, &rtc_tm);
+
+ dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n");
+ }
+
+ /* register RTC and exit */
+ info->rtc = devm_rtc_device_register(&pdev->dev, "s3c", &s3c_rtcops,
+ THIS_MODULE);
+ if (IS_ERR(info->rtc)) {
+ dev_err(&pdev->dev, "cannot attach rtc\n");
+ ret = PTR_ERR(info->rtc);
+ goto err_nortc;
+ }
+
+ 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;
+ }
+
+ ret = devm_request_irq(&pdev->dev, info->irq_tick, s3c_rtc_tickirq,
+ 0, "s3c2410-rtc tick", info);
+ if (ret) {
+ dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_tick, ret);
+ goto err_nortc;
+ }
+
+ if (info->data->select_tick_clk)
+ info->data->select_tick_clk(info);
+
+ s3c_rtc_setfreq(info, 1);
+
+ 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);
+ 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);
+
+ s3c_rtc_enable_clk(info);
+
+ /* save TICNT for anyone using periodic interrupts */
+ if (info->data->save_tick_cnt)
+ info->data->save_tick_cnt(info);
+
+ 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);
+
+ if (info->data->restore_tick_cnt)
+ info->data->restore_tick_cnt(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 void s3c2410_rtc_setfreq(struct s3c_rtc *info, int freq)
+{
+ unsigned int tmp = 0;
+ int val;
+
+ tmp = readb(info->base + S3C2410_TICNT);
+ tmp &= S3C2410_TICNT_ENABLE;
+
+ val = (info->rtc->max_user_freq / freq) - 1;
+ tmp |= val;
+
+ writel(tmp, info->base + S3C2410_TICNT);
+}
+
+static void s3c2416_rtc_setfreq(struct s3c_rtc *info, int freq)
+{
+ unsigned int tmp = 0;
+ int val;
+
+ tmp = readb(info->base + S3C2410_TICNT);
+ tmp &= S3C2410_TICNT_ENABLE;
+
+ val = (info->rtc->max_user_freq / freq) - 1;
+
+ tmp |= S3C2443_TICNT_PART(val);
+ writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1);
+
+ writel(S3C2416_TICNT2_PART(val), info->base + S3C2416_TICNT2);
+
+ writel(tmp, info->base + S3C2410_TICNT);
+}
+
+static void s3c2443_rtc_setfreq(struct s3c_rtc *info, int freq)
+{
+ unsigned int tmp = 0;
+ int val;
+
+ tmp = readb(info->base + S3C2410_TICNT);
+ tmp &= S3C2410_TICNT_ENABLE;
+
+ val = (info->rtc->max_user_freq / freq) - 1;
+
+ tmp |= S3C2443_TICNT_PART(val);
+ writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1);
+
+ writel(tmp, info->base + S3C2410_TICNT);
+}
+
+static void s3c6410_rtc_setfreq(struct s3c_rtc *info, int freq)
+{
+ int val;
+
+ val = (info->rtc->max_user_freq / freq) - 1;
+ writel(val, info->base + S3C2410_TICNT);
+}
+
+static void s3c24xx_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq)
+{
+ unsigned int ticnt;
+
+ ticnt = readb(info->base + S3C2410_TICNT);
+ ticnt &= S3C2410_TICNT_ENABLE;
+
+ seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no");
+}
+
+static void s3c2416_rtc_select_tick_clk(struct s3c_rtc *info)
+{
+ unsigned int con;
+
+ con = readw(info->base + S3C2410_RTCCON);
+ con |= S3C2443_RTCCON_TICSEL;
+ writew(con, info->base + S3C2410_RTCCON);
+}
+
+static void s3c6410_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq)
+{
+ unsigned int ticnt;
+
+ ticnt = readw(info->base + S3C2410_RTCCON);
+ ticnt &= S3C64XX_RTCCON_TICEN;
+
+ seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no");
+}
+
+static void s3c24xx_rtc_save_tick_cnt(struct s3c_rtc *info)
+{
+ info->ticnt_save = readb(info->base + S3C2410_TICNT);
+}
+
+static void s3c24xx_rtc_restore_tick_cnt(struct s3c_rtc *info)
+{
+ writeb(info->ticnt_save, info->base + S3C2410_TICNT);
+}
+
+static void s3c6410_rtc_save_tick_cnt(struct s3c_rtc *info)
+{
+ info->ticnt_en_save = readw(info->base + S3C2410_RTCCON);
+ info->ticnt_en_save &= S3C64XX_RTCCON_TICEN;
+ info->ticnt_save = readl(info->base + S3C2410_TICNT);
+}
+
+static void s3c6410_rtc_restore_tick_cnt(struct s3c_rtc *info)
+{
+ unsigned int con;
+
+ writel(info->ticnt_save, info->base + S3C2410_TICNT);
+ if (info->ticnt_en_save) {
+ con = readw(info->base + S3C2410_RTCCON);
+ writew(con | info->ticnt_en_save,
+ info->base + S3C2410_RTCCON);
+ }
+}
+
+static struct s3c_rtc_data const s3c2410_rtc_data = {
+ .max_user_freq = 128,
+ .irq_handler = s3c24xx_rtc_irq,
+ .set_freq = s3c2410_rtc_setfreq,
+ .enable_tick = s3c24xx_rtc_enable_tick,
+ .save_tick_cnt = s3c24xx_rtc_save_tick_cnt,
+ .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt,
+ .enable = s3c24xx_rtc_enable,
+ .disable = s3c24xx_rtc_disable,
+};
+
+static struct s3c_rtc_data const s3c2416_rtc_data = {
+ .max_user_freq = 32768,
+ .irq_handler = s3c24xx_rtc_irq,
+ .set_freq = s3c2416_rtc_setfreq,
+ .enable_tick = s3c24xx_rtc_enable_tick,
+ .select_tick_clk = s3c2416_rtc_select_tick_clk,
+ .save_tick_cnt = s3c24xx_rtc_save_tick_cnt,
+ .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt,
+ .enable = s3c24xx_rtc_enable,
+ .disable = s3c24xx_rtc_disable,
+};
+
+static struct s3c_rtc_data const s3c2443_rtc_data = {
+ .max_user_freq = 32768,
+ .irq_handler = s3c24xx_rtc_irq,
+ .set_freq = s3c2443_rtc_setfreq,
+ .enable_tick = s3c24xx_rtc_enable_tick,
+ .select_tick_clk = s3c2416_rtc_select_tick_clk,
+ .save_tick_cnt = s3c24xx_rtc_save_tick_cnt,
+ .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt,
+ .enable = s3c24xx_rtc_enable,
+ .disable = s3c24xx_rtc_disable,
+};
+
+static struct s3c_rtc_data const s3c6410_rtc_data = {
+ .max_user_freq = 32768,
+ .needs_src_clk = true,
+ .irq_handler = s3c6410_rtc_irq,
+ .set_freq = s3c6410_rtc_setfreq,
+ .enable_tick = s3c6410_rtc_enable_tick,
+ .save_tick_cnt = s3c6410_rtc_save_tick_cnt,
+ .restore_tick_cnt = s3c6410_rtc_restore_tick_cnt,
+ .enable = s3c24xx_rtc_enable,
+ .disable = s3c6410_rtc_disable,
+};
+
+static struct s3c_rtc_data const exynos3250_rtc_data = {
+ .max_user_freq = 32768,
+ .needs_src_clk = true,
+ .irq_handler = s3c6410_rtc_irq,
+ .set_freq = s3c6410_rtc_setfreq,
+ .enable_tick = s3c6410_rtc_enable_tick,
+ .save_tick_cnt = s3c6410_rtc_save_tick_cnt,
+ .restore_tick_cnt = s3c6410_rtc_restore_tick_cnt,
+ .enable = s3c24xx_rtc_enable,
+ .disable = s3c6410_rtc_disable,
+};
+
+static const struct of_device_id s3c_rtc_dt_match[] = {
+ {
+ .compatible = "samsung,s3c2410-rtc",
+ .data = (void *)&s3c2410_rtc_data,
+ }, {
+ .compatible = "samsung,s3c2416-rtc",
+ .data = (void *)&s3c2416_rtc_data,
+ }, {
+ .compatible = "samsung,s3c2443-rtc",
+ .data = (void *)&s3c2443_rtc_data,
+ }, {
+ .compatible = "samsung,s3c6410-rtc",
+ .data = (void *)&s3c6410_rtc_data,
+ }, {
+ .compatible = "samsung,exynos3250-rtc",
+ .data = (void *)&exynos3250_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");
Code Review / kvmfornfv.git / blobdiff