--- /dev/null
+From 40563ab5aa698191dbd8a05fe6053aa790eee2a1 Mon Sep 17 00:00:00 2001
+From: Alison Wang <b18965@freescale.com>
+Date: Thu, 4 Aug 2011 09:59:46 +0800
+Subject: [PATCH 26/52] Add RTC driver support for MCF5445x
+
+On-chip RTC module support for MCF54451 and MCF54455.
+Using internal 32K clock to drive the rtc module.
+
+Signed-off-by: Alison Wang <b18965@freescale.com>
+---
+ drivers/rtc/Kconfig | 9 +
+ drivers/rtc/Makefile | 1 +
+ drivers/rtc/rtc-mcf.c | 583 +++++++++++++++++++++++++++++++++++++++++++++++++
+ 3 files changed, 593 insertions(+), 0 deletions(-)
+ create mode 100644 drivers/rtc/rtc-mcf.c
+
+--- a/drivers/rtc/Kconfig
++++ b/drivers/rtc/Kconfig
+@@ -919,6 +919,15 @@ config RTC_DRV_MV
+ This driver can also be built as a module. If so, the module
+ will be called rtc-mv.
+
++config RTC_MCF
++ tristate "Freescale Coldfire Real Time Clock"
++ depends on COLDFIRE
++ help
++ If you say yes here you will get support for the on-chip Coldfire
++ Real-Time Clock.
++
++ If you build it as a module it will be call mcf-rtc.
++
+ config RTC_DRV_PS3
+ tristate "PS3 RTC"
+ depends on PPC_PS3
+--- a/drivers/rtc/Makefile
++++ b/drivers/rtc/Makefile
+@@ -102,3 +102,4 @@ obj-$(CONFIG_RTC_DRV_VR41XX) += rtc-vr41
+ obj-$(CONFIG_RTC_DRV_WM831X) += rtc-wm831x.o
+ obj-$(CONFIG_RTC_DRV_WM8350) += rtc-wm8350.o
+ obj-$(CONFIG_RTC_DRV_X1205) += rtc-x1205.o
++obj-$(CONFIG_RTC_MCF) += rtc-mcf.o
+--- /dev/null
++++ b/drivers/rtc/rtc-mcf.c
+@@ -0,0 +1,583 @@
++/*
++ * Copyright (C) 2004-2011 Freescale Semiconductor, Inc. All Rights Reserved.
++ *
++ * Implementation based on rtc-mxc.c
++ * This file contains Real Time Clock interface for Linux.
++ *
++ * This is free software; you can redistribute it and/or modify
++ * it under the terms of the GNU General Public License as published by
++ * the Free Software Foundation; either version 2 of the License, or
++ * (at your option) any later version.
++ */
++
++#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 readl
++#undef readl
++#endif
++
++#ifdef writel
++#undef writel
++#endif
++
++#define readl(addr) in_be32(addr)
++#define writel(val, addr) out_be32((addr), (val))
++
++#define RTC_INPUT_CLK_32768HZ 0x8000
++#define RTC_INPUT_CLK_32000HZ 0x7D00
++#define RTC_INPUT_CLK_38400HZ 0x9600
++#define RTC_INPUT_CLK_48000HZ 0xBB80
++
++#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;
++};
++
++/*!
++ * @defgroup RTC Real Time Clock (RTC) Driver
++ */
++/*!
++ * @file rtc-mcf.c
++ * @brief Real Time Clock interface
++ *
++ * This file contains Real Time Clock interface for Linux.
++ *
++ * @ingroup RTC
++ */
++
++#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 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)
++{
++ u32 day, hr, min, sec, hr_min;
++
++ if (time_alarm == MCF_RTC_TIME) {
++ day = MCF_RTC_DAYS_DAYS(readl(MCF_RTC_DAYS));
++ hr_min = readl(MCF_RTC_HOURMIN);
++ sec = MCF_RTC_SECONDS_SECONDS(readl(MCF_RTC_SECONDS));
++ } else if (time_alarm == MCF_RTC_ALARM) {
++ day = MCF_RTC_ALRM_DAY_DAYS(readl(MCF_RTC_ALRM_DAY));
++ hr_min = readl(MCF_RTC_ALRM_HM);
++ sec = MCF_RTC_ALRM_SEC_SECONDS(readl(MCF_RTC_ALRM_SEC));
++ } else {
++ panic("wrong value for time_alarm=%d\n", time_alarm);
++ }
++
++ hr = (hr_min >> 8) & 0x001F;
++ min = hr_min & 0x003F;
++
++ return (((day * 24 + hr) * 60) + min) * 60 + sec;
++}
++
++/*!
++ * 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, u32 time)
++{
++ u32 day, hr, min, sec, temp;
++
++ day = time / 86400;
++ time -= day * 86400;
++ /* time is within a day now */
++ hr = time / 3600;
++ time -= hr * 3600;
++ /* time is within an hour now */
++ min = time / 60;
++ sec = time - min * 60;
++
++ temp = (hr << 8) + min;
++
++ if (time_alarm == MCF_RTC_TIME) {
++ writel(day, MCF_RTC_DAYS);
++ writel(sec, MCF_RTC_SECONDS);
++ writel(temp, MCF_RTC_HOURMIN);
++ } else if (time_alarm == MCF_RTC_ALARM) {
++ writel(day, MCF_RTC_ALRM_DAY);
++ writel(sec, MCF_RTC_ALRM_SEC);
++ writel(temp, MCF_RTC_ALRM_HM);
++ } 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)
++{
++ struct rtc_time alarm_tm, now_tm;
++ unsigned long now, time;
++ int ret;
++
++ now = get_alarm_or_time(dev, MCF_RTC_TIME);
++ rtc_time_to_tm(now, &now_tm);
++ alarm_tm.tm_year = now_tm.tm_year;
++ alarm_tm.tm_mon = now_tm.tm_mon;
++ alarm_tm.tm_mday = now_tm.tm_mday;
++ alarm_tm.tm_hour = alrm->tm_hour;
++ alarm_tm.tm_min = alrm->tm_min;
++ alarm_tm.tm_sec = alrm->tm_sec;
++ rtc_tm_to_time(&now_tm, &now);
++ rtc_tm_to_time(&alarm_tm, &time);
++ if (time < now) {
++ time += 60 * 60 * 24;
++ rtc_time_to_tm(time, &alarm_tm);
++ }
++ ret = rtc_tm_to_time(&alarm_tm, &time);
++
++ /* clear all the interrupt status bits */
++ writel(readl(MCF_RTC_ISR), MCF_RTC_ISR);
++
++ set_alarm_or_time(dev, MCF_RTC_ALARM, time);
++
++ return ret;
++}
++
++/*!
++ * 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);
++ u32 status, events = 0;
++
++ spin_lock(&rtc_lock);
++
++ /* clear interrupt sources */
++ status = readl(MCF_RTC_ISR) & readl(MCF_RTC_IER);
++ writel(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);
++ writel(0, MCF_RTC_IER); /* Disable all rtc interrupts */
++ writel(0x0000FFBF, MCF_RTC_ISR); /* Clear all interrupt status */
++ 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;
++
++ switch (cmd) {
++ case RTC_PIE_OFF:
++ writel((readl(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);
++ writel((readl(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);
++ writel((readl(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);
++ writel((readl(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);
++ writel((readl(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);
++ writel((readl(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)
++{
++ u32 val;
++
++ /* Avoid roll-over from reading the different registers */
++ do {
++ val = get_alarm_or_time(dev, MCF_RTC_TIME);
++ } while (val != get_alarm_or_time(dev, MCF_RTC_TIME));
++
++ rtc_time_to_tm(val, tm);
++ 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)
++{
++ unsigned long time;
++ int ret;
++
++ ret = rtc_tm_to_time(tm, &time);
++ if (ret != 0)
++ return ret;
++
++ /* Avoid roll-over from reading the different registers */
++ do {
++ set_alarm_or_time(dev, MCF_RTC_TIME, time);
++ } while (time != get_alarm_or_time(dev, MCF_RTC_TIME));
++
++ return ret;
++}
++
++/*!
++ * 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)
++{
++ rtc_time_to_tm(get_alarm_or_time(dev, MCF_RTC_ALARM), &alrm->time);
++ alrm->pending = ((readl(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);
++ 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) {
++ writel((readl(MCF_RTC_IER) | MCF_RTC_ISR_ALM),
++ MCF_RTC_IER);
++ } else {
++ writel((readl(MCF_RTC_IER) & ~MCF_RTC_ISR_ALM),
++ MCF_RTC_IER);
++ }
++ }
++out:
++ spin_unlock_irq(&rtc_lock);
++
++ return ret;
++}
++
++/*!
++ * This function is used to provide the content for the /proc/driver/rtc
++ * file.
++ *
++ * @param buf the buffer to hold the information that the driver
++ * wants to write
++ *
++ * @return The number of bytes written into the rtc file.
++ */
++static int mcf_rtc_proc(struct device *dev, struct seq_file *sq)
++{
++ char *p = sq->buf;
++
++ p += sprintf(p, "alarm_IRQ\t: %s\n",
++ (((readl(MCF_RTC_IER)) & MCF_RTC_ISR_ALM) !=
++ 0) ? "yes" : "no");
++ p += sprintf(p, "update_IRQ\t: %s\n",
++ (((readl(MCF_RTC_IER)) & MCF_RTC_ISR_1HZ) !=
++ 0) ? "yes" : "no");
++ p += sprintf(p, "periodic_IRQ\t: %s\n",
++ (((readl(MCF_RTC_IER)) & PIT_ALL_ON) !=
++ 0) ? "yes" : "no");
++ p += sprintf(p, "periodic_freq\t: %d\n", rtc_freq);
++
++ return p - (sq->buf);
++}
++
++/*!
++ * 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,
++ .proc = mcf_rtc_proc,
++};
++
++static int __devinit mcf_rtc_probe(struct platform_device *pdev)
++{
++ struct timespec tv;
++ struct rtc_device *rtc;
++ struct rtc_plat_data *pdata = NULL;
++ u32 ret = 0;
++
++ pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
++ if (!pdata)
++ return -ENOMEM;
++ /* External clock is hard wired to 32768Hz.
++ * Clock settings 32K, 38.4K and 48K are defined above. */
++#if defined(CONFIG_M5227x) | defined(CONFIG_M5445X)
++ writel(0, MCF_RTC_GOCU);
++ writel(RTC_INPUT_CLK_32768HZ, MCF_RTC_GOCL);
++#endif
++ /* Configure and enable the RTC */
++ 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);
++
++ tv.tv_nsec = 0;
++ tv.tv_sec = get_alarm_or_time(&pdev->dev, MCF_RTC_TIME);
++
++#ifdef CONFIG_M5301x
++ writel(RTC_INPUT_CLK_32768HZ, MCF_RTC_GOC);
++ writel(0x08, MCF_RTC_OCEN);
++#endif
++ writeb(4, MCFSIM_ICR_RTC);
++
++ writel(MCF_RTC_IER_1HZ, MCF_RTC_IER); /* Unmask the 1Hz timer */
++
++ writel(MCF_RTC_CR_EN, MCF_RTC_CR);
++ if ((readl(MCF_RTC_CR) & MCF_RTC_CR_EN) == 0) {
++ printk(KERN_ALERT "RTC Hardware couldn't be enabled!\n");
++ return -EPERM;
++ }
++
++ 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("mcf-rtc");
++static struct platform_driver mcf_rtc_driver = {
++ .driver = {
++ .name = "mcf-rtc",
++ .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");
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