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openwrt-mirror/target/linux/coldfire/patches/027-Add-RTC-driver-support-on-MCF5441x-platform.patch
Imre Kaloz 880de62f91 switch to 2.6.38 
SVN-Revision: 31546
2012-05-01 07:00:17 +00:00

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From 6462d09dad154b69ea6180c0acb2d009627ff1be Mon Sep 17 00:00:00 2001
From: Alison Wang <b18965@freescale.com>
Date: Thu, 4 Aug 2011 09:59:46 +0800
Subject: [PATCH 27/52] Add RTC driver support on MCF5441x platform
Support on-chip robust-RTC module on MCF5441x platform.
Signed-off-by: Alison Wang <b18965@freescale.com>
---
drivers/rtc/Kconfig | 9 +
drivers/rtc/Makefile | 1 +
drivers/rtc/rtc-m5441x.c | 638 ++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 648 insertions(+), 0 deletions(-)
create mode 100644 drivers/rtc/rtc-m5441x.c
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -928,6 +928,15 @@ config RTC_MCF
If you build it as a module it will be call mcf-rtc.
+config RTC_M5441X
+ tristate "Freescale Coldfire M5441X platform Real Time Clock"
+ depends on COLDFIRE
+ help
+ If you say yes here you will get support for the on-chip Coldfire
+ Real-Time Clock for mcf5441x platform.
+
+ If you build it as a module it will be call rtc-m5441x.
+
config RTC_DRV_PS3
tristate "PS3 RTC"
depends on PPC_PS3
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -103,3 +103,4 @@ obj-$(CONFIG_RTC_DRV_WM831X) += rtc-wm83
obj-$(CONFIG_RTC_DRV_WM8350) += rtc-wm8350.o
obj-$(CONFIG_RTC_DRV_X1205) += rtc-x1205.o
obj-$(CONFIG_RTC_MCF) += rtc-mcf.o
+obj-$(CONFIG_RTC_M5441X) += rtc-m5441x.o
--- /dev/null
+++ b/drivers/rtc/rtc-m5441x.c
@@ -0,0 +1,638 @@
+/*
+ * Copyright (C) 2010-2011 Freescale Semiconductor, Inc. All Rights Reserved.
+ *
+ * Lanttor.Guo@freescale.com
+ *
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+/*
+ * Implementation based on rtc-mcf.c
+ */
+
+/*
+ * RTC Real Time Clock (RTC) Driver
+ *
+ * @file rtc-m5441x.c
+ * @brief Real Time Clock interface
+ *
+ * This file contains Real Time Clock interface for Linux.
+ *
+ */
+#include <linux/rtc.h>
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/uaccess.h>
+#include <asm/mcfsim.h>
+#include <linux/slab.h>
+#include <linux/io.h>
+
+#ifdef readw
+#undef readw
+#endif
+
+#ifdef writew
+#undef writew
+#endif
+
+#define readw(addr) in_be16(addr)
+#define writew(val, addr) out_be16((addr), (val))
+
+
+#define PIT_ALL_ON (MCF_RTC_ISR_2HZ | MCF_RTC_ISR_SAM0 | MCF_RTC_ISR_SAM1 | \
+ MCF_RTC_ISR_SAM2 | MCF_RTC_ISR_SAM3 | MCF_RTC_ISR_SAM4 | \
+ MCF_RTC_ISR_SAM5 | MCF_RTC_ISR_SAM6 | MCF_RTC_ISR_SAM7)
+
+#define MAX_PIE_NUM 9
+#define MAX_PIE_FREQ 512
+const u32 PIE_BIT_DEF[MAX_PIE_NUM][2] = {
+ {2, MCF_RTC_ISR_2HZ},
+ {4, MCF_RTC_ISR_SAM0},
+ {8, MCF_RTC_ISR_SAM1},
+ {16, MCF_RTC_ISR_SAM2},
+ {32, MCF_RTC_ISR_SAM3},
+ {64, MCF_RTC_ISR_SAM4},
+ {128, MCF_RTC_ISR_SAM5},
+ {256, MCF_RTC_ISR_SAM6},
+ {MAX_PIE_FREQ, MCF_RTC_ISR_SAM7},
+};
+
+/* Those are the bits from a classic RTC we want to mimic */
+#define RTC_IRQF 0x80 /* any of the following 3 is active */
+#define RTC_PF 0x40 /* Periodic interrupt */
+#define RTC_AF 0x20 /* Alarm interrupt */
+#define RTC_UF 0x10 /* Update interrupt for 1Hz RTC */
+
+#define MCF_RTC_TIME 0
+#define MCF_RTC_ALARM 1
+
+struct rtc_plat_data {
+ struct rtc_device *rtc;
+ int irq;
+ unsigned int irqen;
+ int alrm_sec;
+ int alrm_min;
+ int alrm_hour;
+ int alrm_mday;
+};
+
+static const int year_cal_basic = 2112;
+
+#define RTC_VERSION "0.1"
+
+static u32 rtc_freq = 2; /* minimun value for PIE */
+static unsigned long rtc_status;
+
+static struct rtc_time g_rtc_alarm = {
+ .tm_year = 0,
+ .tm_mon = 0,
+ .tm_mday = 0,
+ .tm_hour = 0,
+ .tm_mon = 0,
+ .tm_sec = 0,
+};
+
+static DEFINE_SPINLOCK(rtc_lock);
+
+
+/*
+ * This funciton is used to disable RTC register write protection
+ */
+static void disable_register_write_protection(void)
+{
+ if (readw(MCF_RTC_SR) & MCF_RTC_SR_WPE) {
+ writew(0x0000, MCF_RTC_CR);
+ writew(0x0001, MCF_RTC_CR);
+ writew(0x0003, MCF_RTC_CR);
+ writew(0x0002, MCF_RTC_CR);
+ }
+
+}
+
+/*
+ * This function is used to obtain the RTC time or the alarm value in
+ * second.
+ *
+ * @param time_alarm use MCF_RTC_TIME for RTC time value;
+ * MCF_RTC_ALARM for alarm value
+ *
+ * @return The RTC time or alarm time in second.
+ */
+static u32 get_alarm_or_time(struct device *dev, int time_alarm,
+ struct rtc_time *tm)
+{
+ dev_dbg(dev, "debug function %s()!\n", __func__);
+
+ if (time_alarm == MCF_RTC_TIME) {
+ /*check register information */
+ dev_dbg(dev, "RTC_YEARMON:0x%x,RTC_DAYS:0x%x,RTC_HOURMIN:0x%x,"
+ "RTC_SECONDS:0x%x\n", readw(MCF_RTC_YEARMON),
+ readw(MCF_RTC_DAYS), readw(MCF_RTC_HOURMIN),
+ readw(MCF_RTC_SECONDS));
+
+ /* get year */
+ tm->tm_year = year_cal_basic +
+ (char)(MCF_RTC_YEARMON_YEAR_RD(readw(MCF_RTC_YEARMON)));
+ /* get month */
+ tm->tm_mon =
+ MCF_RTC_YEARMON_MON_RD(readw(MCF_RTC_YEARMON)) - 1;
+ /* get month day */
+ tm->tm_mday = MCF_RTC_DAYS_DAY_RD(readw(MCF_RTC_DAYS));
+ /* get year day */
+ tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon,
+ tm->tm_year);
+ /* year minus 1900 */
+ tm->tm_year = tm->tm_year - 1900;
+ /* get week day */
+ tm->tm_wday = MCF_RTC_DAYS_DAYWEEK_RD(readw(MCF_RTC_DAYS));
+ /* get hours */
+ tm->tm_hour =
+ MCF_RTC_HOURMIN_HOURS_RD(readw(MCF_RTC_HOURMIN));
+ /* get minutes */
+ tm->tm_min =
+ MCF_RTC_HOURMIN_MINUTES_RD(readw(MCF_RTC_HOURMIN));
+ /* get seconds */
+ tm->tm_sec =
+ MCF_RTC_SECONDS_SECONDS_RD(readw(MCF_RTC_SECONDS));
+ /* no day saving time */
+ tm->tm_isdst = -1;
+
+ /* check rtc_tm fileds information */
+ dev_dbg(dev, "RTC TIME --> year:%d,yday:%d,mon:%d,mday:%d,"
+ "wday:%d,hour:%d,min:%d,sec:%d\n", tm->tm_year,
+ tm->tm_yday, tm->tm_mon, tm->tm_mday, tm->tm_wday,
+ tm->tm_hour, tm->tm_min, tm->tm_sec);
+
+ } else if (time_alarm == MCF_RTC_ALARM) {
+ tm->tm_year = year_cal_basic +
+ (char)MCF_RTC_YEARMON_YEAR_RD
+ (readw(MCF_RTC_ALRM_YRMON));
+ tm->tm_mon =
+ MCF_RTC_YEARMON_MON_RD(readw(MCF_RTC_ALRM_YRMON)) - 1;
+ tm->tm_mday = MCF_RTC_DAYS_DAY_RD(readw(MCF_RTC_ALRM_DAYS));
+ tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon,
+ tm->tm_year);
+ tm->tm_year = tm->tm_year - 1900;
+ tm->tm_wday =
+ MCF_RTC_DAYS_DAYWEEK_RD(readw(MCF_RTC_ALRM_DAYS));
+ tm->tm_hour =
+ MCF_RTC_HOURMIN_HOURS_RD(readw(MCF_RTC_ALRM_HM));
+ tm->tm_min =
+ MCF_RTC_HOURMIN_MINUTES_RD(readw(MCF_RTC_ALRM_HM));
+ tm->tm_sec =
+ MCF_RTC_SECONDS_SECONDS_RD(readw(MCF_RTC_ALRM_SEC));
+ tm->tm_isdst = -1;
+
+ /* debug information */
+ dev_dbg(dev, "RTC ALARM --> year:%d,yday:%d,mon:%d,mday:%d,"
+ "wday:%d,hour:%d,min:%d,sec:%d\n", tm->tm_year,
+ tm->tm_yday, tm->tm_mon, tm->tm_mday, tm->tm_wday,
+ tm->tm_hour, tm->tm_min, tm->tm_sec);
+
+ } else {
+ panic("wrong value for time_alarm=%d\n", time_alarm);
+ }
+
+ return 0;
+}
+
+/*
+ * This function sets the RTC alarm value or the time value.
+ *
+ * @param time_alarm the new alarm value to be updated in the RTC
+ * @param time use MCF_RTC_TIME for RTC time value;
+ * MCF_RTC_ALARM for alarm value
+ */
+static void set_alarm_or_time(struct device *dev, int time_alarm,
+ struct rtc_time *tm)
+{
+ char year;
+
+ dev_dbg(dev, "debug function %s()!\n", __func__);
+
+ /* wirte enable setting */
+ disable_register_write_protection();
+
+ if (time_alarm == MCF_RTC_TIME) {
+ /* check rtc_time fields information */
+ dev_dbg(dev, "RTC TIME --> year:%d,yday:%d,mon:%d,mday:%d,"
+ "wday:%d,hour:%d,min:%d,sec:%d\n", tm->tm_year,
+ tm->tm_yday, tm->tm_mon, tm->tm_mday, tm->tm_wday,
+ tm->tm_hour, tm->tm_min, tm->tm_sec);
+
+ year = ((tm->tm_year + 1900) - year_cal_basic);
+ /* write RTC_YEARMON register */
+ writew((year << 8) | (tm->tm_mon + 1), MCF_RTC_YEARMON);
+
+ /* write RTC_DAYS register */
+ writew(MCF_RTC_DAYS_DAYWEEK_SET(tm->tm_wday) |
+ MCF_RTC_DAYS_DAY_SET(tm->tm_mday), MCF_RTC_DAYS);
+
+ /* write RTC_HOURMIN register */
+ writew(MCF_RTC_HOURMIN_HOURS_SET(tm->tm_hour) |
+ MCF_RTC_HOURMIN_MINUTES_SET(tm->tm_min),
+ MCF_RTC_HOURMIN);
+
+ /* write RTC_SECONDS register */
+ writew(MCF_RTC_SECONDS_SECONDS_SET
+ (tm->tm_sec), MCF_RTC_SECONDS);
+
+ /* debug information */
+ dev_dbg(dev, "RTC_YEARMON:0x%x, RTC_DAYS:0x%x, "
+ "RTC_HOURMIN:0x%x, RTC_SECONDS:0x%x\n",
+ readw(MCF_RTC_YEARMON), readw(MCF_RTC_DAYS),
+ readw(MCF_RTC_HOURMIN), readw(MCF_RTC_SECONDS));
+ } else if (time_alarm == MCF_RTC_ALARM) {
+
+ year = ((tm->tm_year + 1900) - year_cal_basic);
+ /* write RTC_YEARMON register */
+ writew((year << 8) | (tm->tm_mon + 1), MCF_RTC_ALRM_YRMON);
+
+ /* write RTC_DAYS register */
+ writew(MCF_RTC_DAYS_DAYWEEK_SET(tm->tm_wday) |
+ MCF_RTC_DAYS_DAY_SET(tm->tm_mday), MCF_RTC_ALRM_DAYS);
+
+ /* write RTC_HOURMIN register */
+ writew(MCF_RTC_HOURMIN_HOURS_SET(tm->tm_hour) |
+ MCF_RTC_HOURMIN_MINUTES_SET(tm->tm_min),
+ MCF_RTC_ALRM_HM);
+
+ /* write RTC_SECONDS register */
+ writew(MCF_RTC_SECONDS_SECONDS_SET
+ (tm->tm_sec), MCF_RTC_ALRM_SEC);
+
+ /* debug information */
+ dev_dbg(dev, "ALRM_YRMON:0x%x,ALRM_DAYS:0x%x,ALRM_HM:0x%x,"
+ "ALRM_SEC:0x%x\n", readw(MCF_RTC_ALRM_YRMON),
+ readw(MCF_RTC_ALRM_DAYS), readw(MCF_RTC_ALRM_HM),
+ readw(MCF_RTC_ALRM_SEC));
+ } else {
+ panic("wrong value for time_alarm=%d\n", time_alarm);
+ }
+}
+
+/*!
+ * This function updates the RTC alarm registers and then clears all the
+ * interrupt status bits.
+ *
+ * @param alrm the new alarm value to be updated in the RTC
+ *
+ * @return 0 if successful; non-zero otherwise.
+ */
+static int rtc_update_alarm(struct device *dev, struct rtc_time *alrm)
+{
+ /* clear all the interrupt status bits */
+ disable_register_write_protection();
+
+ writew(readw(MCF_RTC_ISR), MCF_RTC_ISR);
+
+ set_alarm_or_time(dev, MCF_RTC_ALARM, alrm);
+
+ return 0;
+}
+
+/*!
+ * This function is the RTC interrupt service routine.
+ *
+ * @param irq RTC IRQ number
+ * @param dev_id device ID which is not used
+ *
+ * @return IRQ_HANDLED as defined in the include/linux/interrupt.h file.
+ */
+static irqreturn_t mcf_rtc_interrupt(int irq, void *dev_id)
+{
+ struct platform_device *pdev = dev_id;
+ struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
+ u16 status = 0;
+ u32 events = 0;
+
+ spin_lock(&rtc_lock);
+
+ /* clear interrupt sources */
+ status = readw(MCF_RTC_ISR) & readw(MCF_RTC_IER);
+
+ disable_register_write_protection();
+
+ writew(status, MCF_RTC_ISR);
+
+ /* clear alarm interrupt if it has occurred */
+ if (status & MCF_RTC_ISR_ALM)
+ status &= ~MCF_RTC_ISR_ALM;
+
+ /* update irq data & counter */
+ if (status & MCF_RTC_ISR_ALM)
+ events |= (RTC_AF | RTC_IRQF);
+ if (status & MCF_RTC_ISR_1HZ)
+ events |= (RTC_UF | RTC_IRQF);
+ if (status & PIT_ALL_ON)
+ events |= (RTC_PF | RTC_IRQF);
+
+ if ((status & MCF_RTC_ISR_ALM) && rtc_valid_tm(&g_rtc_alarm))
+ rtc_update_alarm(&pdev->dev, &g_rtc_alarm);
+
+ spin_unlock(&rtc_lock);
+ rtc_update_irq(pdata->rtc, 1, events);
+ return IRQ_HANDLED;
+}
+
+/*!
+ * clear all interrupts and release the IRQ
+ */
+static void mcf_rtc_release(struct device *dev)
+{
+ spin_lock_irq(&rtc_lock);
+
+ disable_register_write_protection();
+
+ writew(0, MCF_RTC_IER); /* Disable all rtc interrupts */
+ writew(readw(MCF_RTC_ISR), MCF_RTC_ISR);
+ spin_unlock_irq(&rtc_lock);
+ rtc_status = 0;
+}
+
+/*!
+ * This function is used to support some ioctl calls directly.
+ * Other ioctl calls are supported indirectly through the
+ * arm/common/rtctime.c file.
+ *
+ * @param cmd ioctl command as defined in include/linux/rtc.h
+ * @param arg value for the ioctl command
+ *
+ * @return 0 if successful or negative value otherwise.
+ */
+static int mcf_rtc_ioctl(struct device *dev, unsigned int cmd,
+ unsigned long arg)
+{
+ int i;
+
+ disable_register_write_protection();
+
+ switch (cmd) {
+ case RTC_PIE_OFF:
+ writew((readw(MCF_RTC_IER) & ~PIT_ALL_ON), MCF_RTC_IER);
+ return 0;
+ case RTC_IRQP_SET:
+ if (arg < 2 || arg > MAX_PIE_FREQ || (arg % 2) != 0)
+ return -EINVAL; /* Also make sure a power of 2Hz */
+ if ((arg > 64) && (!capable(CAP_SYS_RESOURCE)))
+ return -EACCES;
+ rtc_freq = arg;
+ return 0;
+ case RTC_IRQP_READ:
+ return put_user(rtc_freq, (u32 *) arg);
+ case RTC_PIE_ON:
+ for (i = 0; i < MAX_PIE_NUM; i++) {
+ if (PIE_BIT_DEF[i][0] == rtc_freq)
+ break;
+ }
+ if (i == MAX_PIE_NUM)
+ return -EACCES;
+ spin_lock_irq(&rtc_lock);
+ writew((readw(MCF_RTC_IER) | PIE_BIT_DEF[i][1]), MCF_RTC_IER);
+ spin_unlock_irq(&rtc_lock);
+ return 0;
+ case RTC_AIE_OFF:
+ spin_lock_irq(&rtc_lock);
+ writew((readw(MCF_RTC_IER) & ~MCF_RTC_ISR_ALM), MCF_RTC_IER);
+ spin_unlock_irq(&rtc_lock);
+ return 0;
+
+ case RTC_AIE_ON:
+ spin_lock_irq(&rtc_lock);
+ writew((readw(MCF_RTC_IER) | MCF_RTC_ISR_ALM), MCF_RTC_IER);
+ spin_unlock_irq(&rtc_lock);
+ return 0;
+
+ case RTC_UIE_OFF: /* UIE is for the 1Hz interrupt */
+ spin_lock_irq(&rtc_lock);
+ writew((readw(MCF_RTC_IER) & ~MCF_RTC_ISR_1HZ), MCF_RTC_IER);
+ spin_unlock_irq(&rtc_lock);
+ return 0;
+
+ case RTC_UIE_ON:
+ spin_lock_irq(&rtc_lock);
+ writew((readw(MCF_RTC_IER) | MCF_RTC_ISR_1HZ), MCF_RTC_IER);
+ spin_unlock_irq(&rtc_lock);
+ return 0;
+ }
+ return -ENOIOCTLCMD;
+}
+
+/*!
+ * This function reads the current RTC time into tm in Gregorian date.
+ *
+ * @param tm contains the RTC time value upon return
+ *
+ * @return 0 if successful; non-zero otherwise.
+ */
+static int mcf_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+ do {
+ get_alarm_or_time(dev, MCF_RTC_TIME, tm);
+ } while (0);
+
+ return 0;
+}
+
+/*!
+ * This function sets the internal RTC time based on tm in Gregorian date.
+ *
+ * @param tm the time value to be set in the RTC
+ *
+ * @return 0 if successful; non-zero otherwise.
+ */
+static int mcf_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+ do {
+ set_alarm_or_time(dev, MCF_RTC_TIME, tm);
+ } while (0);
+
+ return 0;
+}
+
+/*!
+ * This function reads the current alarm value into the passed in \b alrm
+ * argument. It updates the \b alrm's pending field value based on the whether
+ * an alarm interrupt occurs or not.
+ *
+ * @param alrm contains the RTC alarm value upon return
+ *
+ * @return 0 if successful; non-zero otherwise.
+ */
+static int mcf_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+ do {
+ get_alarm_or_time(dev, MCF_RTC_ALARM, &alrm->time);
+ } while (0);
+
+ alrm->pending = ((readw(MCF_RTC_ISR) & MCF_RTC_ISR_ALM) != 0) ? 1 : 0;
+
+ return 0;
+}
+
+/*!
+ * This function sets the RTC alarm based on passed in alrm.
+ *
+ * @param alrm the alarm value to be set in the RTC
+ *
+ * @return 0 if successful; non-zero otherwise.
+ */
+static int mcf_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+ int ret;
+
+ spin_lock_irq(&rtc_lock);
+
+ disable_register_write_protection();
+
+ if (rtc_valid_tm(&alrm->time)) {
+ if (alrm->time.tm_sec > 59 ||
+ alrm->time.tm_hour > 23 || alrm->time.tm_min > 59) {
+ ret = -EINVAL;
+ goto out;
+ }
+ ret = rtc_update_alarm(dev, &alrm->time);
+ } else {
+ ret = rtc_valid_tm(&alrm->time);
+ if (ret)
+ goto out;
+ ret = rtc_update_alarm(dev, &alrm->time);
+ }
+
+ if (ret == 0) {
+ memcpy(&g_rtc_alarm, &alrm->time, sizeof(struct rtc_time));
+
+ if (alrm->enabled) {
+ writew((readw(MCF_RTC_IER) | MCF_RTC_ISR_ALM),
+ MCF_RTC_IER);
+ } else {
+ writew((readw(MCF_RTC_IER) & ~MCF_RTC_ISR_ALM),
+ MCF_RTC_IER);
+ }
+ }
+out:
+ spin_unlock_irq(&rtc_lock);
+
+ return ret;
+}
+
+/*!
+ * The RTC driver structure
+ */
+static struct rtc_class_ops mcf_rtc_ops = {
+ .ioctl = mcf_rtc_ioctl,
+ .read_time = mcf_rtc_read_time,
+ .set_time = mcf_rtc_set_time,
+ .read_alarm = mcf_rtc_read_alarm,
+ .set_alarm = mcf_rtc_set_alarm,
+};
+
+static int __devinit mcf_rtc_probe(struct platform_device *pdev)
+{
+ struct rtc_device *rtc;
+ struct rtc_plat_data *pdata = NULL;
+ u32 ret = 0;
+
+ disable_register_write_protection();
+ /* Clear interrupt before request irq */
+ writew(0x0100, MCF_RTC_CR);
+ writew(0x0001, MCF_RTC_IER);
+
+ if (!(readw(MCF_RTC_CFG_DATA) & MCF_RTC_CFG_DATA_OSCEN))
+ writew(MCF_RTC_CFG_DATA_OSCEN, MCF_RTC_CFG_DATA);
+
+ pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return -ENOMEM;
+
+ pdata->irq = MCFINT_VECBASE + MCFINT_RTC;
+ if (request_irq(pdata->irq, mcf_rtc_interrupt, IRQF_DISABLED,
+ pdev->name, pdev) < 0) {
+ dev_warn(&pdev->dev, "interrupt not available.\n");
+ pdata->irq = -1;
+ }
+
+ if (test_and_set_bit(1, &rtc_status))
+ return -EBUSY;
+
+ rtc = rtc_device_register(pdev->name, &pdev->dev, &mcf_rtc_ops,
+ THIS_MODULE);
+ if (IS_ERR(rtc)) {
+ ret = PTR_ERR(rtc);
+ if (pdata->irq >= 0)
+ free_irq(pdata->irq, pdev);
+ kfree(pdata);
+ return ret;
+ }
+ pdata->rtc = rtc;
+ platform_set_drvdata(pdev, pdata);
+
+ dev_dbg(&pdev->dev, "RTC_CR:0x%x, RTC_SR:0x%x\n", readw(MCF_RTC_CR),
+ readw(MCF_RTC_SR));
+
+ printk(KERN_INFO "Real Time Clock Driver v%s\n", RTC_VERSION);
+ return ret;
+}
+
+static int __devexit mcf_rtc_remove(struct platform_device *pdev)
+{
+ struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
+
+ rtc_device_unregister(pdata->rtc);
+ if (pdata->irq >= 0)
+ free_irq(pdata->irq, pdev);
+ kfree(pdata);
+ mcf_rtc_release(NULL);
+ return 0;
+}
+
+/*!
+ * Contains pointers to the power management callback functions.
+ */
+MODULE_ALIAS("rtc-m5441x");
+static struct platform_driver mcf_rtc_driver = {
+ .driver = {
+ .name = "rtc-m5441x",
+ .owner = THIS_MODULE,
+ },
+ .probe = mcf_rtc_probe,
+ .remove = __devexit_p(mcf_rtc_remove),
+};
+
+/*!
+ * This function creates the /proc/driver/rtc file and registers the device RTC
+ * in the /dev/misc directory. It also reads the RTC value from external source
+ * and setup the internal RTC properly.
+ *
+ * @return -1 if RTC is failed to initialize; 0 is successful.
+ */
+static int __init mcf_rtc_init(void)
+{
+ return platform_driver_register(&mcf_rtc_driver);
+}
+
+/*!
+ * This function removes the /proc/driver/rtc file and un-registers the
+ * device RTC from the /dev/misc directory.
+ */
+static void __exit mcf_rtc_exit(void)
+{
+ platform_driver_unregister(&mcf_rtc_driver);
+
+}
+
+module_init(mcf_rtc_init);
+module_exit(mcf_rtc_exit);
+
+MODULE_AUTHOR("Freescale Semiconductor, Inc.");
+MODULE_DESCRIPTION("Real Time Clock Driver (MCF)");
+MODULE_LICENSE("GPL V2");
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