ref: 220dfb87f561f73ec1d154e08511332a660d1119
dir: /sys/src/9/arm64/devrtc.c/
/* * PL031 RTC driver */ #include "u.h" #include "../port/lib.h" #include "mem.h" #include "dat.h" #include "fns.h" #include "../port/error.h" enum{ Qdir = 0, Qrtc, }; static u32int *regs = (u32int *)(VIRTIO + 0x01010000); Dirtab rtcdir[]={ ".", {Qdir, 0, QTDIR}, 0, 0555, "rtc", {Qrtc, 0}, 0, 0664, }; 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, nelem(rtcdir), devgen); } static int rtcstat(Chan* c, uchar* dp, int n) { return devstat(c, dp, n, rtcdir, nelem(rtcdir), devgen); } static Chan* rtcopen(Chan* c, int omode) { omode = openmode(omode); switch((ulong)c->qid.path){ case Qrtc: if(strcmp(up->user, eve)!=0 && omode!=OREAD) error(Eperm); break; } return devopen(c, omode, rtcdir, nelem(rtcdir), devgen); } static void rtcclose(Chan*) { } long rtctime(void) { return *regs; } static long rtcread(Chan* c, void* buf, long n, vlong off) { ulong offset = off; if(c->qid.type & QTDIR) return devdirread(c, buf, n, rtcdir, nelem(rtcdir), devgen); switch((ulong)c->qid.path){ case Qrtc: return readnum(offset, buf, n, rtctime(), 12); } error(Ebadarg); } static long rtcwrite(Chan*, void*, long, vlong) { error(Eperm); } Dev rtcdevtab = { 'r', "rtc", devreset, devinit, devshutdown, rtcattach, rtcwalk, rtcstat, rtcopen, devcreate, rtcclose, rtcread, devbread, rtcwrite, devbwrite, devremove, devwstat, };