ref: 83b854df0d2a98ca35f8d3215e7fe34531563b20
dir: /sys/src/9/pc/ec.c/
/* * 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 uchar ecrr(int reg) { return inb(ec.port[reg]); } static void ecwr(int reg, uchar val) { outb(ec.port[reg], val); } static int ecwait(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; } int ecread(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; } int ecwrite(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 long ecarchread(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 long ecarchwrite(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; } int ecinit(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; }