/* * embedded controller (usually at ports 0x66/0x62) */#include	"u.h"#include	"../port/lib.h"#include	"mem.h"#include	"dat.h"#include	"fns.h"#include	"io.h"#include	"../port/error.h" enum {	/* registers */	EC_SC	= 0,	EC_DATA, 	/* Embedded Controller Status, EC_SC (R) */	OBF	= 1<<0,	IBF	= 1<<1,	CMD	= 1<<3,	BURST	= 1<<4,	SCI_EVT	= 1<<5,	SMI_EVT	= 1<<6, 	/* Embedded Controller Command Set */	RD_EC	= 0x80,	WR_EC	= 0x81,	BE_EC	= 0x82,	BD_EC	= 0x83,	QR_EC	= 0x84,}; static struct {	Lock;	int	init;	int	port[2];	/* EC_SC and EC_DATA */} ec; static ucharecrr(int reg){	return inb(ec.port[reg]);}static voidecwr(int reg, uchar val){	outb(ec.port[reg], val);} static intecwait(uchar mask, uchar val){	int i, s; 	s = 0;	for(i=0; i<1000; i++){		s = ecrr(EC_SC);		if((s & mask) == val)			return 0;		delay(1);	}	print("ec: wait timeout status=%x pc=%#p\n", s, getcallerpc(&mask));	return -1;} intecread(uchar addr){	int r; 	r = -1;	lock(&ec);	if(!ec.init)		goto out;	if(ecwait(IBF, 0))		goto out;	ecwr(EC_SC, RD_EC);	if(ecwait(IBF, 0))		goto out;	ecwr(EC_DATA, addr);	if(ecwait(OBF, OBF))		goto out;	r = ecrr(EC_DATA);	ecwait(OBF, 0);out:	unlock(&ec);	return r;} intecwrite(uchar addr, uchar val){	int r; 	r = -1;	lock(&ec);	if(!ec.init)		goto out;	if(ecwait(IBF, 0))		goto out;	ecwr(EC_SC, WR_EC);	if(ecwait(IBF, 0))		goto out;	ecwr(EC_DATA, addr);	if(ecwait(IBF, 0))		goto out;	ecwr(EC_DATA, val);	if(ecwait(IBF, 0))		goto out;	r = 0;out:	unlock(&ec);	return r;} static longecarchread(Chan*, void *a, long n, vlong off){	int port, v;	uchar *p; 	if(off < 0 || off >= 256)		return 0;	if(off+n > 256)		n = 256 - off;	p = a;	for(port = off; port < off+n; port++){		if((v = ecread(port)) < 0)			error(Eio);		*p++ = v;	}	return n;} static longecarchwrite(Chan*, void *a, long n, vlong off){	int port;	uchar *p; 	if(off < 0 || off+n > 256)		error(Ebadarg);	p = a;	for(port = off; port < off+n; port++)		if(ecwrite(port, *p++) < 0)			error(Eio);	return n;} intecinit(int cmdport, int dataport){	print("ec: cmd %X, data %X\n", cmdport, dataport); 	if(ioalloc(cmdport, 1, 0, "ec.sc") < 0){		print("ec: cant allocate cmd port %X\n", cmdport);		return -1;	}	if(ioalloc(dataport, 1, 0, "ec.data") < 0){		print("ec: cant allocate data port %X\n", dataport);		iofree(cmdport);		return -1;	} 	lock(&ec);	ec.port[EC_SC] = cmdport;	ec.port[EC_DATA] = dataport;	ec.init = 1;	unlock(&ec); 	addarchfile("ec", 0660, ecarchread, ecarchwrite); 	return 0;}