rtc-s3c.c

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/* drivers/rtc/rtc-s3c.c
 *
 * Copyright (c) 2010 Samsung Electronics Co., Ltd.
 *      http://www.samsung.com/
 *
 * Copyright (c) 2004,2006 Simtec Electronics
 *  Ben Dooks, <[email protected]>
 *  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 <mach/hardware.h>
#include <asm/irq.h>
#include <plat/regs-rtc.h>

enum s3c_cpu_type {
    TYPE_S3C2410,
    TYPE_S3C2416,
    TYPE_S3C2443,
    TYPE_S3C64XX,
};

struct s3c_rtc_drv_data {
    int cpu_type;
};

/* I have yet to find an S3C implementation with more than one
 * of these rtc blocks in */

static struct resource *s3c_rtc_mem;

static struct clk *rtc_clk;
static void __iomem *s3c_rtc_base;
static int s3c_rtc_alarmno = NO_IRQ;
static int s3c_rtc_tickno  = NO_IRQ;
static bool wake_en;
static enum s3c_cpu_type s3c_rtc_cpu_type;

static DEFINE_SPINLOCK(s3c_rtc_pie_lock);

static void s3c_rtc_alarm_clk_enable(bool enable)
{
    static DEFINE_SPINLOCK(s3c_rtc_alarm_clk_lock);
    static bool alarm_clk_enabled;
    unsigned long irq_flags;

    spin_lock_irqsave(&s3c_rtc_alarm_clk_lock, irq_flags);
    if (enable) {
        if (!alarm_clk_enabled) {
            clk_enable(rtc_clk);
            alarm_clk_enabled = true;
        }
    } else {
        if (alarm_clk_enabled) {
            clk_disable(rtc_clk);
            alarm_clk_enabled = false;
        }
    }
    spin_unlock_irqrestore(&s3c_rtc_alarm_clk_lock, irq_flags);
}

/* IRQ Handlers */

static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
{
    struct rtc_device *rdev = id;

    clk_enable(rtc_clk);
    rtc_update_irq(rdev, 1, RTC_AF | RTC_IRQF);

    if (s3c_rtc_cpu_type == TYPE_S3C64XX)
        writeb(S3C2410_INTP_ALM, s3c_rtc_base + S3C2410_INTP);

    clk_disable(rtc_clk);

    s3c_rtc_alarm_clk_enable(false);

    return IRQ_HANDLED;
}

static irqreturn_t s3c_rtc_tickirq(int irq, void *id)
{
    struct rtc_device *rdev = id;

    clk_enable(rtc_clk);
    rtc_update_irq(rdev, 1, RTC_PF | RTC_IRQF);

    if (s3c_rtc_cpu_type == TYPE_S3C64XX)
        writeb(S3C2410_INTP_TIC, s3c_rtc_base + S3C2410_INTP);

    clk_disable(rtc_clk);
    return IRQ_HANDLED;
}

/* Update control registers */
static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
{
    unsigned int tmp;

    pr_debug("%s: aie=%d\n", __func__, enabled);

    clk_enable(rtc_clk);
    tmp = readb(s3c_rtc_base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;

    if (enabled)
        tmp |= S3C2410_RTCALM_ALMEN;

    writeb(tmp, s3c_rtc_base + S3C2410_RTCALM);
    clk_disable(rtc_clk);

    s3c_rtc_alarm_clk_enable(enabled);

    return 0;
}

static int s3c_rtc_setfreq(struct device *dev, int freq)
{
    struct platform_device *pdev = to_platform_device(dev);
    struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
    unsigned int tmp = 0;
    int val;

    if (!is_power_of_2(freq))
        return -EINVAL;

    clk_enable(rtc_clk);
    spin_lock_irq(&s3c_rtc_pie_lock);

    if (s3c_rtc_cpu_type != TYPE_S3C64XX) {
        tmp = readb(s3c_rtc_base + S3C2410_TICNT);
        tmp &= S3C2410_TICNT_ENABLE;
    }

    val = (rtc_dev->max_user_freq / freq) - 1;

    if (s3c_rtc_cpu_type == TYPE_S3C2416 || s3c_rtc_cpu_type == TYPE_S3C2443) {
        tmp |= S3C2443_TICNT_PART(val);
        writel(S3C2443_TICNT1_PART(val), s3c_rtc_base + S3C2443_TICNT1);

        if (s3c_rtc_cpu_type == TYPE_S3C2416)
            writel(S3C2416_TICNT2_PART(val), s3c_rtc_base + S3C2416_TICNT2);
    } else {
        tmp |= val;
    }

    writel(tmp, s3c_rtc_base + S3C2410_TICNT);
    spin_unlock_irq(&s3c_rtc_pie_lock);
    clk_disable(rtc_clk);

    return 0;
}

/* Time read/write */

static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
{
    unsigned int have_retried = 0;
    void __iomem *base = s3c_rtc_base;

    clk_enable(rtc_clk);
 retry_get_time:
    rtc_tm->tm_min  = readb(base + S3C2410_RTCMIN);
    rtc_tm->tm_hour = readb(base + S3C2410_RTCHOUR);
    rtc_tm->tm_mday = readb(base + S3C2410_RTCDATE);
    rtc_tm->tm_mon  = readb(base + S3C2410_RTCMON);
    rtc_tm->tm_year = readb(base + S3C2410_RTCYEAR);
    rtc_tm->tm_sec  = readb(base + S3C2410_RTCSEC);

    /* the only way to work out wether 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);

    rtc_tm->tm_year += 100;

    pr_debug("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;

    clk_disable(rtc_clk);
    return rtc_valid_tm(rtc_tm);
}

static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
{
    void __iomem *base = s3c_rtc_base;
    int year = tm->tm_year - 100;

    pr_debug("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;
    }

    clk_enable(rtc_clk);
    writeb(bin2bcd(tm->tm_sec),  base + S3C2410_RTCSEC);
    writeb(bin2bcd(tm->tm_min),  base + S3C2410_RTCMIN);
    writeb(bin2bcd(tm->tm_hour), base + S3C2410_RTCHOUR);
    writeb(bin2bcd(tm->tm_mday), base + S3C2410_RTCDATE);
    writeb(bin2bcd(tm->tm_mon + 1), base + S3C2410_RTCMON);
    writeb(bin2bcd(year), base + S3C2410_RTCYEAR);
    clk_disable(rtc_clk);

    return 0;
}

static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
{
    struct rtc_time *alm_tm = &alrm->time;
    void __iomem *base = s3c_rtc_base;
    unsigned int alm_en;

    clk_enable(rtc_clk);
    alm_tm->tm_sec  = readb(base + S3C2410_ALMSEC);
    alm_tm->tm_min  = readb(base + S3C2410_ALMMIN);
    alm_tm->tm_hour = readb(base + S3C2410_ALMHOUR);
    alm_tm->tm_mon  = readb(base + S3C2410_ALMMON);
    alm_tm->tm_mday = readb(base + S3C2410_ALMDATE);
    alm_tm->tm_year = readb(base + S3C2410_ALMYEAR);

    alm_en = readb(base + S3C2410_RTCALM);

    alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0;

    pr_debug("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;

    clk_disable(rtc_clk);
    return 0;
}

static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
{
    struct rtc_time *tm = &alrm->time;
    void __iomem *base = s3c_rtc_base;
    unsigned int alrm_en;

    clk_enable(rtc_clk);
    pr_debug("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);

    alrm_en = readb(base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
    writeb(0x00, base + S3C2410_RTCALM);

    if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
        alrm_en |= S3C2410_RTCALM_SECEN;
        writeb(bin2bcd(tm->tm_sec), base + S3C2410_ALMSEC);
    }

    if (tm->tm_min < 60 && tm->tm_min >= 0) {
        alrm_en |= S3C2410_RTCALM_MINEN;
        writeb(bin2bcd(tm->tm_min), base + S3C2410_ALMMIN);
    }

    if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
        alrm_en |= S3C2410_RTCALM_HOUREN;
        writeb(bin2bcd(tm->tm_hour), base + S3C2410_ALMHOUR);
    }

    pr_debug("setting S3C2410_RTCALM to %08x\n", alrm_en);

    writeb(alrm_en, base + S3C2410_RTCALM);

    s3c_rtc_setaie(dev, alrm->enabled);

    clk_disable(rtc_clk);
    return 0;
}

static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
{
    unsigned int ticnt;

    clk_enable(rtc_clk);
    if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
        ticnt = readw(s3c_rtc_base + S3C2410_RTCCON);
        ticnt &= S3C64XX_RTCCON_TICEN;
    } else {
        ticnt = readb(s3c_rtc_base + S3C2410_TICNT);
        ticnt &= S3C2410_TICNT_ENABLE;
    }

    seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt  ? "yes" : "no");
    clk_disable(rtc_clk);
    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 s3c_rtc_enable(struct platform_device *pdev, int en)
{
    void __iomem *base = s3c_rtc_base;
    unsigned int tmp;

    if (s3c_rtc_base == NULL)
        return;

    clk_enable(rtc_clk);
    if (!en) {
        tmp = readw(base + S3C2410_RTCCON);
        if (s3c_rtc_cpu_type == TYPE_S3C64XX)
            tmp &= ~S3C64XX_RTCCON_TICEN;
        tmp &= ~S3C2410_RTCCON_RTCEN;
        writew(tmp, base + S3C2410_RTCCON);

        if (s3c_rtc_cpu_type != TYPE_S3C64XX) {
            tmp = readb(base + S3C2410_TICNT);
            tmp &= ~S3C2410_TICNT_ENABLE;
            writeb(tmp, base + S3C2410_TICNT);
        }
    } else {
        /* re-enable the device, and check it is ok */

        if ((readw(base+S3C2410_RTCCON) & S3C2410_RTCCON_RTCEN) == 0) {
            dev_info(&pdev->dev, "rtc disabled, re-enabling\n");

            tmp = readw(base + S3C2410_RTCCON);
            writew(tmp | S3C2410_RTCCON_RTCEN,
                base + S3C2410_RTCCON);
        }

        if ((readw(base + S3C2410_RTCCON) & S3C2410_RTCCON_CNTSEL)) {
            dev_info(&pdev->dev, "removing RTCCON_CNTSEL\n");

            tmp = readw(base + S3C2410_RTCCON);
            writew(tmp & ~S3C2410_RTCCON_CNTSEL,
                base + S3C2410_RTCCON);
        }

        if ((readw(base + S3C2410_RTCCON) & S3C2410_RTCCON_CLKRST)) {
            dev_info(&pdev->dev, "removing RTCCON_CLKRST\n");

            tmp = readw(base + S3C2410_RTCCON);
            writew(tmp & ~S3C2410_RTCCON_CLKRST,
                base + S3C2410_RTCCON);
        }
    }
    clk_disable(rtc_clk);
}

static int __devexit s3c_rtc_remove(struct platform_device *dev)
{
    struct rtc_device *rtc = platform_get_drvdata(dev);

    free_irq(s3c_rtc_alarmno, rtc);
    free_irq(s3c_rtc_tickno, rtc);

    platform_set_drvdata(dev, NULL);
    rtc_device_unregister(rtc);

    s3c_rtc_setaie(&dev->dev, 0);

    clk_put(rtc_clk);
    rtc_clk = NULL;

    iounmap(s3c_rtc_base);
    release_resource(s3c_rtc_mem);
    kfree(s3c_rtc_mem);

    return 0;
}

static const struct of_device_id s3c_rtc_dt_match[];

static inline int s3c_rtc_get_driver_data(struct platform_device *pdev)
{
#ifdef CONFIG_OF
    struct s3c_rtc_drv_data *data;
    if (pdev->dev.of_node) {
        const struct of_device_id *match;
        match = of_match_node(s3c_rtc_dt_match, pdev->dev.of_node);
        data = (struct s3c_rtc_drv_data *) match->data;
        return data->cpu_type;
    }
#endif
    return platform_get_device_id(pdev)->driver_data;
}

static int __devinit s3c_rtc_probe(struct platform_device *pdev)
{
    struct rtc_device *rtc;
    struct rtc_time rtc_tm;
    struct resource *res;
    int ret;
    int tmp;

    pr_debug("%s: probe=%p\n", __func__, pdev);

    /* find the IRQs */

    s3c_rtc_tickno = platform_get_irq(pdev, 1);
    if (s3c_rtc_tickno < 0) {
        dev_err(&pdev->dev, "no irq for rtc tick\n");
        return s3c_rtc_tickno;
    }

    s3c_rtc_alarmno = platform_get_irq(pdev, 0);
    if (s3c_rtc_alarmno < 0) {
        dev_err(&pdev->dev, "no irq for alarm\n");
        return s3c_rtc_alarmno;
    }

    pr_debug("s3c2410_rtc: tick irq %d, alarm irq %d\n",
         s3c_rtc_tickno, s3c_rtc_alarmno);

    /* get the memory region */

    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    if (res == NULL) {
        dev_err(&pdev->dev, "failed to get memory region resource\n");
        return -ENOENT;
    }

    s3c_rtc_mem = request_mem_region(res->start, resource_size(res),
                     pdev->name);

    if (s3c_rtc_mem == NULL) {
        dev_err(&pdev->dev, "failed to reserve memory region\n");
        ret = -ENOENT;
        goto err_nores;
    }

    s3c_rtc_base = ioremap(res->start, resource_size(res));
    if (s3c_rtc_base == NULL) {
        dev_err(&pdev->dev, "failed ioremap()\n");
        ret = -EINVAL;
        goto err_nomap;
    }

    rtc_clk = clk_get(&pdev->dev, "rtc");
    if (IS_ERR(rtc_clk)) {
        dev_err(&pdev->dev, "failed to find rtc clock source\n");
        ret = PTR_ERR(rtc_clk);
        rtc_clk = NULL;
        goto err_clk;
    }

    clk_enable(rtc_clk);

    /* check to see if everything is setup correctly */

    s3c_rtc_enable(pdev, 1);

    pr_debug("s3c2410_rtc: RTCCON=%02x\n",
         readw(s3c_rtc_base + S3C2410_RTCCON));

    device_init_wakeup(&pdev->dev, 1);

    /* register RTC and exit */

    rtc = rtc_device_register("s3c", &pdev->dev, &s3c_rtcops,
                  THIS_MODULE);

    if (IS_ERR(rtc)) {
        dev_err(&pdev->dev, "cannot attach rtc\n");
        ret = PTR_ERR(rtc);
        goto err_nortc;
    }

    s3c_rtc_cpu_type = s3c_rtc_get_driver_data(pdev);

    /* Check RTC Time */

    s3c_rtc_gettime(NULL, &rtc_tm);

    if (rtc_valid_tm(&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(NULL, &rtc_tm);

        dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n");
    }

    if (s3c_rtc_cpu_type != TYPE_S3C2410)
        rtc->max_user_freq = 32768;
    else
        rtc->max_user_freq = 128;

    if (s3c_rtc_cpu_type == TYPE_S3C2416 || s3c_rtc_cpu_type == TYPE_S3C2443) {
        tmp = readw(s3c_rtc_base + S3C2410_RTCCON);
        tmp |= S3C2443_RTCCON_TICSEL;
        writew(tmp, s3c_rtc_base + S3C2410_RTCCON);
    }

    platform_set_drvdata(pdev, rtc);

    s3c_rtc_setfreq(&pdev->dev, 1);

    ret = request_irq(s3c_rtc_alarmno, s3c_rtc_alarmirq,
              0,  "s3c2410-rtc alarm", rtc);
    if (ret) {
        dev_err(&pdev->dev, "IRQ%d error %d\n", s3c_rtc_alarmno, ret);
        goto err_alarm_irq;
    }

    ret = request_irq(s3c_rtc_tickno, s3c_rtc_tickirq,
              0,  "s3c2410-rtc tick", rtc);
    if (ret) {
        dev_err(&pdev->dev, "IRQ%d error %d\n", s3c_rtc_tickno, ret);
        free_irq(s3c_rtc_alarmno, rtc);
        goto err_tick_irq;
    }

    clk_disable(rtc_clk);

    return 0;

 err_tick_irq:
    free_irq(s3c_rtc_alarmno, rtc);

 err_alarm_irq:
    platform_set_drvdata(pdev, NULL);
    rtc_device_unregister(rtc);

 err_nortc:
    s3c_rtc_enable(pdev, 0);
    clk_disable(rtc_clk);
    clk_put(rtc_clk);

 err_clk:
    iounmap(s3c_rtc_base);

 err_nomap:
    release_resource(s3c_rtc_mem);

 err_nores:
    return ret;
}

#ifdef CONFIG_PM

/* RTC Power management control */

static int ticnt_save, ticnt_en_save;

static int s3c_rtc_suspend(struct platform_device *pdev, pm_message_t state)
{
    clk_enable(rtc_clk);
    /* save TICNT for anyone using periodic interrupts */
    ticnt_save = readb(s3c_rtc_base + S3C2410_TICNT);
    if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
        ticnt_en_save = readw(s3c_rtc_base + S3C2410_RTCCON);
        ticnt_en_save &= S3C64XX_RTCCON_TICEN;
    }
    s3c_rtc_enable(pdev, 0);

    if (device_may_wakeup(&pdev->dev) && !wake_en) {
        if (enable_irq_wake(s3c_rtc_alarmno) == 0)
            wake_en = true;
        else
            dev_err(&pdev->dev, "enable_irq_wake failed\n");
    }
    clk_disable(rtc_clk);

    return 0;
}

static int s3c_rtc_resume(struct platform_device *pdev)
{
    unsigned int tmp;

    clk_enable(rtc_clk);
    s3c_rtc_enable(pdev, 1);
    writeb(ticnt_save, s3c_rtc_base + S3C2410_TICNT);
    if (s3c_rtc_cpu_type == TYPE_S3C64XX && ticnt_en_save) {
        tmp = readw(s3c_rtc_base + S3C2410_RTCCON);
        writew(tmp | ticnt_en_save, s3c_rtc_base + S3C2410_RTCCON);
    }

    if (device_may_wakeup(&pdev->dev) && wake_en) {
        disable_irq_wake(s3c_rtc_alarmno);
        wake_en = false;
    }
    clk_disable(rtc_clk);

    return 0;
}
#else
#define s3c_rtc_suspend NULL
#define s3c_rtc_resume  NULL
#endif

#ifdef CONFIG_OF
static struct s3c_rtc_drv_data s3c_rtc_drv_data_array[] = {
    [TYPE_S3C2410] = { TYPE_S3C2410 },
    [TYPE_S3C2416] = { TYPE_S3C2416 },
    [TYPE_S3C2443] = { TYPE_S3C2443 },
    [TYPE_S3C64XX] = { TYPE_S3C64XX },
};

static const struct of_device_id s3c_rtc_dt_match[] = {
    {
        .compatible = "samsung,s3c2410-rtc",
        .data = &s3c_rtc_drv_data_array[TYPE_S3C2410],
    }, {
        .compatible = "samsung,s3c2416-rtc",
        .data = &s3c_rtc_drv_data_array[TYPE_S3C2416],
    }, {
        .compatible = "samsung,s3c2443-rtc",
        .data = &s3c_rtc_drv_data_array[TYPE_S3C2443],
    }, {
        .compatible = "samsung,s3c6410-rtc",
        .data = &s3c_rtc_drv_data_array[TYPE_S3C64XX],
    },
    {},
};
MODULE_DEVICE_TABLE(of, s3c_rtc_dt_match);
#else
#define s3c_rtc_dt_match NULL
#endif

static struct platform_device_id s3c_rtc_driver_ids[] = {
    {
        .name       = "s3c2410-rtc",
        .driver_data    = TYPE_S3C2410,
    }, {
        .name       = "s3c2416-rtc",
        .driver_data    = TYPE_S3C2416,
    }, {
        .name       = "s3c2443-rtc",
        .driver_data    = TYPE_S3C2443,
    }, {
        .name       = "s3c64xx-rtc",
        .driver_data    = TYPE_S3C64XX,
    },
    { }
};

MODULE_DEVICE_TABLE(platform, s3c_rtc_driver_ids);

static struct platform_driver s3c_rtc_driver = {
    .probe      = s3c_rtc_probe,
    .remove     = __devexit_p(s3c_rtc_remove),
    .suspend    = s3c_rtc_suspend,
    .resume     = s3c_rtc_resume,
    .id_table   = s3c_rtc_driver_ids,
    .driver     = {
        .name   = "s3c-rtc",
        .owner  = THIS_MODULE,
        .of_match_table = s3c_rtc_dt_match,
    },
};

module_platform_driver(s3c_rtc_driver);

MODULE_DESCRIPTION("Samsung S3C RTC Driver");
MODULE_AUTHOR("Ben Dooks <[email protected]>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:s3c2410-rtc");