/* drivers/char/pxa270_rtc.c * * Copyright (c) 2004 Simtec Electronics <linux@simtec.co.uk> *		      http://www.simtec.co.uk/products/SWLINUX/ * * 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. * * PXA270 Internal RTC Driver * *  Changelog: *	08-Nov-2004	BJD	Initial creation *	12-Nov-2004	BJD	Added periodic IRQ and PM code *	22-Nov-2004	BJD	Sign-test on alarm code to check for <0*/#include <linux/module.h>#include <linux/fs.h>#include <linux/string.h>#include <linux/init.h>#include <linux/device.h>#include <linux/interrupt.h>#include <linux/rtc.h>#include <linux/bcd.h>#include <linux/delay.h>#include <asm/hardware.h>#include <asm/uaccess.h>#include <asm/io.h>#include <asm/irq.h>#include <asm/rtc.h>#include <asm/mach/time.h>#include <linux/moduleparam.h>#include <linux/types.h>#include <linux/timer.h>#include <linux/jiffies.h>#include <linux/config.h>#include <linux/wait.h>#include <linux/slab.h>#include <linux/ioport.h>#include <linux/fs.h>#include <linux/miscdevice.h>#include <linux/watchdog.h>#include <linux/notifier.h>#include <linux/init.h>#include <linux/spinlock.h>#include <linux/reboot.h>#include <asm/uaccess.h>#include <asm/io.h>#include <asm/hardware/clock.h>#include <asm/arch/pxa-regs.h>#include <asm-arm/delay.h>/* need this for the RTC_AF definitions *///#include <linux/mc146818rtc.h>#undef PXA270_VA_RTC#define PXA270_VA_RTC pxa270_rtc_base#define DEBUGstatic struct resource *pxa270_rtc_mem;static void __iomem *pxa270_rtc_base;static int pxa270_rtc_alarmno = NO_IRQ;static int pxa270_rtc_tickno  = NO_IRQ;static int pxa270_rtc_freq    = 1;static spinlock_t pxa270_rtc_pie_lock = SPIN_LOCK_UNLOCKED;/* IRQ Handlers */static irqreturn_t pxa270_rtc_alarmirq(int irq, void *id, struct pt_regs *r){///	rtc_update(1, RTC_AF | RTC_IRQF);	return IRQ_HANDLED;}static irqreturn_t pxa270_rtc_tickirq(int irq, void *id, struct pt_regs *r){///	rtc_update(1, RTC_PF | RTC_IRQF);	return IRQ_HANDLED;}/* Update control registers */static void pxa270_rtc_setaie(int to){	unsigned int tmp;	pr_debug("%s: aie=%d\n", __FUNCTION__, to);#if 0	tmp = readb(PXA270_RTCALM);	if (to)		tmp |= PXA270_RTCALM_ALMEN;	else		tmp &= ~PXA270_RTCALM_ALMEN;	writeb(tmp, PXA270_RTCALM);#endif}static void pxa270_rtc_setpie(int to){	unsigned int tmp;	pr_debug("%s: pie=%d\n", __FUNCTION__, to);#if 0	spin_lock_irq(&pxa270_rtc_pie_lock);	tmp = readb(PXA270_TICNT) & ~PXA270_TICNT_ENABLE;	if (to)		tmp |= PXA270_TICNT_ENABLE;	writeb(tmp, PXA270_TICNT);	spin_unlock_irq(&pxa270_rtc_pie_lock);#endif}static void pxa270_rtc_setfreq(int freq){	unsigned int tmp;#if 0	spin_lock_irq(&pxa270_rtc_pie_lock);	tmp = readb(PXA270_TICNT) & PXA270_TICNT_ENABLE;	pxa270_rtc_freq = freq;	tmp |= (128 / freq)-1;	writeb(tmp, PXA270_TICNT);	spin_unlock_irq(&pxa270_rtc_pie_lock);#endif}/* Time read/write */static void pxa270_rtc_gettime(struct rtc_time *rtc_tm)/* Written by Kenan */{	rtc_tm->tm_sec  = (RDCR >>  0) & 0x3F;	rtc_tm->tm_min  = (RDCR >>  6) & 0x3F;	rtc_tm->tm_hour = (RDCR >> 12) & 0x1F;	rtc_tm->tm_mday = (RYCR >>  0) & 0x1F;	rtc_tm->tm_mon  = (RYCR >>  5) & 0xF;	rtc_tm->tm_year = (RYCR >>  9) & 0xFFF; #if 0	unsigned int have_retried = 0; retry_get_time:	rtc_tm->tm_min  = readb(PXA270_RTCMIN);	rtc_tm->tm_hour = readb(PXA270_RTCHOUR);	rtc_tm->tm_mday = readb(PXA270_RTCDATE);	rtc_tm->tm_mon  = readb(PXA270_RTCMON);	rtc_tm->tm_year = readb(PXA270_RTCYEAR);	rtc_tm->tm_sec  = readb(PXA270_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;	}	pr_debug("read time %02x.%02x.%02x %02x/%02x/%02x\n",		 rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday,		 rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);	BCD_TO_BIN(rtc_tm->tm_sec);	BCD_TO_BIN(rtc_tm->tm_min);	BCD_TO_BIN(rtc_tm->tm_hour);	BCD_TO_BIN(rtc_tm->tm_mday);	BCD_TO_BIN(rtc_tm->tm_mon);	BCD_TO_BIN(rtc_tm->tm_year);	rtc_tm->tm_year += 100;	rtc_tm->tm_mon -= 1;#endif}static int pxa270_rtc_settime(struct rtc_time *tm)/* written by Kenan */{	/* the rtc gets round the y2k problem by just not supporting it */	RYCR = ( (tm->tm_mday <<0) | (tm->tm_mon << 5) | (tm->tm_year <<9));    RDCR = ( (tm->tm_sec  <<0) | (tm->tm_min << 6) | (tm->tm_hour << 12)); #if 0	if (tm->tm_year < 100)		return -EINVAL;	writeb(BIN2BCD(tm->tm_sec),  PXA270_RTCSEC);	writeb(BIN2BCD(tm->tm_min),  PXA270_RTCMIN);	writeb(BIN2BCD(tm->tm_hour), PXA270_RTCHOUR);	writeb(BIN2BCD(tm->tm_mday), PXA270_RTCDATE);	writeb(BIN2BCD(tm->tm_mon + 1), PXA270_RTCMON);	writeb(BIN2BCD(tm->tm_year - 100), PXA270_RTCYEAR);#endif	return 0;}static void pxa270_rtc_getalarm(struct rtc_wkalrm *alrm){	struct rtc_time *alm_tm = &alrm->time;	unsigned int alm_en;#if 0	printk("pxa270_rtc:RTTR=%2x\n",readb(RTTR));	alm_tm->tm_sec  = readb(PXA270_ALMSEC);	alm_tm->tm_min  = readb(PXA270_ALMMIN);	alm_tm->tm_hour = readb(PXA270_ALMHOUR);	alm_tm->tm_mon  = readb(PXA270_ALMMON);	alm_tm->tm_mday = readb(PXA270_ALMDATE);	alm_tm->tm_year = readb(PXA270_ALMYEAR);	alm_en = readb(PXA270_RTCALM);	pr_debug("read alarm %02x %02x.%02x.%02x %02x/%02x/%02x\n",		 alm_en,		 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 & PXA270_RTCALM_SECEN) {		BCD_TO_BIN(alm_tm->tm_sec);	} else {		alm_tm->tm_sec = 0xff;	}	if (alm_en & PXA270_RTCALM_MINEN) {		BCD_TO_BIN(alm_tm->tm_min);	} else {		alm_tm->tm_min = 0xff;	}	if (alm_en & PXA270_RTCALM_HOUREN) {		BCD_TO_BIN(alm_tm->tm_hour);	} else {		alm_tm->tm_hour = 0xff;	}	if (alm_en & PXA270_RTCALM_DAYEN) {		BCD_TO_BIN(alm_tm->tm_mday);	} else {		alm_tm->tm_mday = 0xff;	}	if (alm_en & PXA270_RTCALM_MONEN) {		BCD_TO_BIN(alm_tm->tm_mon);		alm_tm->tm_mon -= 1;	} else {		alm_tm->tm_mon = 0xff;	}	if (alm_en & PXA270_RTCALM_YEAREN) {		BCD_TO_BIN(alm_tm->tm_year);	} else {		alm_tm->tm_year = 0xffff;	}#endif	/* todo - set alrm->enabled ? */}static int pxa270_rtc_setalarm(struct rtc_wkalrm *alrm){	struct rtc_time *tm = &alrm->time;	unsigned int alrm_en;#if 0	pr_debug("pxa270_rtc_setalarm: %d, %02x/%02x/%02x %02x.%02x.%02x\n",		 alrm->enabled,		 tm->tm_mday & 0xff, tm->tm_mon & 0xff, tm->tm_year & 0xff,		 tm->tm_hour & 0xff, tm->tm_min & 0xff, tm->tm_sec);	if (alrm->enabled || 1) {		alrm_en = readb(PXA270_RTCALM) & PXA270_RTCALM_ALMEN;		writeb(0x00, PXA270_RTCALM);		if (tm->tm_sec < 60 && tm->tm_sec >= 0) {			alrm_en |= PXA270_RTCALM_SECEN;			writeb(BIN2BCD(tm->tm_sec), PXA270_ALMSEC);		}		if (tm->tm_min < 60 && tm->tm_min >= 0) {			alrm_en |= PXA270_RTCALM_MINEN;			writeb(BIN2BCD(tm->tm_min), PXA270_ALMMIN);		}		if (tm->tm_hour < 24 && tm->tm_hour >= 0) {			alrm_en |= PXA270_RTCALM_HOUREN;			writeb(BIN2BCD(tm->tm_hour), PXA270_ALMHOUR);		}		pr_debug("setting PXA270_RTCALM to %08x\n", alrm_en);		writeb(alrm_en, PXA270_RTCALM);		enable_irq_wake(pxa270_rtc_alarmno);	} else {		alrm_en = readb(PXA270_RTCALM);		alrm_en &= ~PXA270_RTCALM_ALMEN;		writeb(alrm_en, PXA270_RTCALM);		disable_irq_wake(pxa270_rtc_alarmno);	}#endif	return 0;}static int pxa270_rtc_ioctl(unsigned int cmd, unsigned long arg){#if 0	switch (cmd) {	case RTC_AIE_OFF:	case RTC_AIE_ON:		pxa270_rtc_setaie((cmd == RTC_AIE_ON) ? 1 : 0);		return 0;	case RTC_PIE_OFF:	case RTC_PIE_ON:		pxa270_rtc_setpie((cmd == RTC_PIE_ON) ? 1 : 0);		return 0;	case RTC_IRQP_READ:		return put_user(pxa270_rtc_freq, (unsigned long __user *)arg);	case RTC_IRQP_SET:		if (arg < 1 || arg > 64)			return -EINVAL;		if (!capable(CAP_SYS_RESOURCE))			return -EACCES;		/* check for power of 2 */		if ((arg & (arg-1)) != 0)