#include	"u.h"#include	"../port/lib.h"#include	"mem.h"#include	"dat.h"#include	"fns.h"#include	"../port/error.h" #include	"io.h" /* * Mostek MK48T12-15 Zeropower/Timekeeper * This driver is actually portable. */typedef struct Rtc	Rtc;struct Rtc{	int	sec;	int	min;	int	hour;	int	wday;	int	mday;	int	mon;	int	year;}; static uchar	rtcgencksum(void);static void	setrtc(Rtc *rtc);static long	rtctime(void);static int	*yrsize(int yr);static int	*yrsize(int yr);static ulong	rtc2sec(Rtc *rtc);static void	sec2rtc(ulong secs, Rtc *rtc); static struct{	uchar	*cksum;	uchar	*ram;	RTCdev	*rtc;}nvr; enum{	Qdir,	Qrtc,	Qnvram,}; QLock	rtclock;		/* mutex on clock operations */ static Dirtab rtcdir[]={	".",		{Qdir, 0, QTDIR},	0,	0555,	"rtc",		{Qrtc, 0},	0,		0666,	"nvram",	{Qnvram, 0},	NVWRITE,	0666,};#define	NRTC	(sizeof(rtcdir)/sizeof(rtcdir[0])) static voidrtcinit(void){	KMap *k; 	k = kmappa(NVR_CKSUM_PHYS, PTENOCACHE|PTEIO);	nvr.cksum = (uchar*)VA(k); 	k = kmappa(NVR_PHYS, PTENOCACHE|PTEIO);	nvr.ram = (uchar*)VA(k);	nvr.rtc = (RTCdev*)(VA(k)+RTCOFF); 	rtcgencksum();} static Chan*rtcattach(char *spec){	return devattach('r',spec);} static Walkqid*rtcwalk(Chan *c, Chan *nc, char **name, int nname){	return devwalk(c, nc, name, nname, rtcdir, NRTC, devgen);} static intrtcstat(Chan *c, uchar *dp, int n){	return devstat(c, dp, n, rtcdir, NRTC, devgen);} static Chan*rtcopen(Chan *c, int omode){	omode = openmode(omode);	switch((ulong)c->qid.path){	case Qrtc:		if(strcmp(up->env->user, eve)!=0 && omode!=OREAD)			error(Eperm);		break;	case Qnvram:		if(strcmp(up->env->user, eve)!=0)			error(Eperm);	}	return devopen(c, omode, rtcdir, NRTC, devgen);} static void	 rtccreate(Chan *c, char *name, int omode, ulong perm){	USED(c, name, omode, perm);	error(Eperm);} static void	 rtcclose(Chan *c){	USED(c);} static long	 rtcread(Chan *c, void *buf, long n, vlong offset){	ulong t, ot; 	if(c->qid.type & QTDIR)		return devdirread(c, buf, n, rtcdir, NRTC, devgen); 	switch((ulong)c->qid.path){	case Qrtc:		qlock(&rtclock);		t = rtctime();		do{			ot = t;			t = rtctime();	/* make sure there's no skew */		}while(t != ot);		qunlock(&rtclock);		n = readnum(offset, buf, n, t, 12);		return n;	case Qnvram:		if(offset > NVREAD)			return 0;		if(n > NVREAD - offset)			n = NVREAD - offset;		qlock(&rtclock);		memmove(buf, nvr.ram+offset, n);		qunlock(&rtclock);		return n;	}	error(Egreg);	return 0;		/* not reached */} /* * XXX - Tad: fixme to generate the correct checksum */static ucharrtcgencksum(void){	uchar cksum;	int i;	static uchar p1cksum = 0;	static uchar p1cksumvalid=0; 	if(!p1cksumvalid) {		for(i=1; i < 0x1000 ; i++)			p1cksum ^= nvr.cksum[i];		p1cksumvalid = 1;	} 	cksum = p1cksum; 	for(i=0; i < 0xfdf ; i++) {		cksum ^= nvr.ram[i];	} 	return cksum;} static long	 rtcwrite(Chan *c, void *buf, long n, vlong offset){	Rtc rtc;	ulong secs;	char *cp, sbuf[32]; 	switch((ulong)c->qid.path){	case Qrtc:		/*		 *  read the time		 */		if(offset != 0 || n >= sizeof(sbuf)-1)			error(Ebadarg);		memmove(sbuf, buf, n);		sbuf[n] = '\0';		cp = sbuf;		while(*cp){			if(*cp>='0' && *cp<='9')				break;			cp++;		}		secs = strtoul(cp, 0, 0);		/*		 *  convert to bcd		 */		sec2rtc(secs, &rtc);		/*		 * write it		 */		qlock(&rtclock);		setrtc(&rtc);		qunlock(&rtclock);		return n;	case Qnvram:		if(offset > NVWRITE)			return 0;		if(n > NVWRITE - offset)			n = NVWRITE - offset;		qlock(&rtclock);		memmove(nvr.ram+offset, buf, n);		*nvr.cksum = rtcgencksum();		qunlock(&rtclock);		return n;	}	error(Egreg);	return 0;		/* not reached */} #define bcd2dec(bcd)	(((((bcd)>>4) & 0x0F) * 10) + ((bcd) & 0x0F))#define dec2bcd(dec)	((((dec)/10)<<4)|((dec)%10)) static voidsetrtc(Rtc *rtc){	struct RTCdev *dev; 	dev = nvr.rtc;	dev->control |= RTCWRITE;	wbflush();	dev->year = dec2bcd(rtc->year % 100);	dev->mon = dec2bcd(rtc->mon);	dev->mday = dec2bcd(rtc->mday);	dev->hour = dec2bcd(rtc->hour);	dev->min = dec2bcd(rtc->min);	dev->sec = dec2bcd(rtc->sec);	wbflush();	dev->control &= ~RTCWRITE;	wbflush();} static longrtctime(void){	struct RTCdev *dev;	Rtc rtc; 	dev = nvr.rtc;	dev->control |= RTCREAD;	wbflush();	rtc.sec = bcd2dec(dev->sec) & 0x7F;	rtc.min = bcd2dec(dev->min & 0x7F);	rtc.hour = bcd2dec(dev->hour & 0x3F);	rtc.mday = bcd2dec(dev->mday & 0x3F);	rtc.mon = bcd2dec(dev->mon & 0x3F);	rtc.year = bcd2dec(dev->year);	dev->control &= ~RTCREAD;	wbflush(); 	if (rtc.mon < 1 || rtc.mon > 12)		return 0;	/*	 *  the world starts Jan 1 1970	 */	if(rtc.year < 70)		rtc.year += 2000;	else		rtc.year += 1900; 	return rtc2sec(&rtc);} #define SEC2MIN 60L#define SEC2HOUR (60L*SEC2MIN)#define SEC2DAY (24L*SEC2HOUR) /* *  days per month plus days/year */static	int	dmsize[] ={	365, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};static	int	ldmsize[] ={	366, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; /* *  return the days/month for the given year */static int *yrsize(int yr){	if((yr % 4) == 0)		return ldmsize;	else		return dmsize;} /* *  compute seconds since Jan 1 1970 */static ulongrtc2sec(Rtc *rtc){	ulong secs;	int i;	int *d2m; 	secs = 0; 	/*	 *  seconds per year	 */	for(i = 1970; i < rtc->year; i++){		d2m = yrsize(i);		secs += d2m[0] * SEC2DAY;	} 	/*	 *  seconds per month	 */	d2m = yrsize(rtc->year);	for(i = 1; i < rtc->mon; i++)		secs += d2m[i] * SEC2DAY; 	secs += (rtc->mday-1) * SEC2DAY;	secs += rtc->hour * SEC2HOUR;	secs += rtc->min * SEC2MIN;	secs += rtc->sec; 	return secs;} /* *  compute rtc from seconds since Jan 1 1970 */static voidsec2rtc(ulong secs, Rtc *rtc){	int d;	long hms, day;	int *d2m; 	/*	 * break initial number into days	 */	hms = secs % SEC2DAY;	day = secs / SEC2DAY;	if(hms < 0) {		hms += SEC2DAY;		day -= 1;	} 	/*	 * generate hours:minutes:seconds	 */	rtc->sec = hms % 60;	d = hms / 60;	rtc->min = d % 60;	d /= 60;	rtc->hour = d; 	/*	 * year number	 */	if(day >= 0)		for(d = 1970; day >= *yrsize(d); d++)			day -= *yrsize(d);	else		for (d = 1970; day < 0; d--)			day += *yrsize(d-1);	rtc->year = d; 	/*	 * generate month	 */	d2m = yrsize(rtc->year);	for(d = 1; day >= d2m[d]; d++)		day -= d2m[d];	rtc->mday = day + 1;	rtc->mon = d; 	return;} Dev rtcdevtab = {	'r',	"rtc", 	devreset,	rtcinit,	devshutdown,	rtcattach,	rtcwalk,	rtcstat,	rtcopen,	rtccreate,	rtcclose,	rtcread,	devbread,	rtcwrite,	devbwrite,	devremove,	devwstat,};