C++ (Cpp) pn8_read_pending_wait Examples

Example #1

File: powernow.c Project: JabirTech/Source

static int
pn8_write_fidvid(u_int fid, u_int vid, uint64_t ctrl, uint64_t *status)
{
	int i = 100;

	do
		WRITE_FIDVID(fid, vid, ctrl);
	while (pn8_read_pending_wait(status) && --i);

	return (i == 0 ? ENXIO : 0);
}

Example #2

static int
pn8_setfidvid(struct pn_softc *sc, int fid, int vid)
{
	uint64_t status;
	int cfid, cvid;
	int rvo;
	int rv;
	u_int val;

	rv = pn8_read_pending_wait(&status);
	if (rv)
		return (rv);

	cfid = PN8_STA_CFID(status);
	cvid = PN8_STA_CVID(status);

	if (fid == cfid && vid == cvid)
		return (0);

	/*
	 * Phase 1: Raise core voltage to requested VID if frequency is
	 * going up.
	 */
	while (cvid > vid) {
		val = cvid - (1 << sc->mvs);
		rv = pn8_write_fidvid(cfid, (val > 0) ? val : 0, 1ULL, &status);
		if (rv) {
			sc->errata |= PENDING_STUCK;
			return (rv);
		}
		cvid = PN8_STA_CVID(status);
		COUNT_OFF_VST(sc->vst);
	}

	/* ... then raise to voltage + RVO (if required) */
	for (rvo = sc->rvo; rvo > 0 && cvid > 0; --rvo) {
		/* XXX It's not clear from spec if we have to do that
		 * in 0.25 step or in MVS.  Therefore do it as it's done
		 * under Linux */
		rv = pn8_write_fidvid(cfid, cvid - 1, 1ULL, &status);
		if (rv) {
			sc->errata |= PENDING_STUCK;
			return (rv);
		}
		cvid = PN8_STA_CVID(status);
		COUNT_OFF_VST(sc->vst);
	}

	/* Phase 2: change to requested core frequency */
	if (cfid != fid) {
		u_int vco_fid, vco_cfid, fid_delta;

		vco_fid = FID_TO_VCO_FID(fid);
		vco_cfid = FID_TO_VCO_FID(cfid);

		while (abs(vco_fid - vco_cfid) > 2) {
			fid_delta = (vco_cfid & 1) ? 1 : 2;
			if (fid > cfid) {
				if (cfid > 7)
					val = cfid + fid_delta;
				else
					val = FID_TO_VCO_FID(cfid) + fid_delta;
			} else
				val = cfid - fid_delta;
			rv = pn8_write_fidvid(val, cvid,
			    sc->pll * (uint64_t) sc->fsb,
			    &status);
			if (rv) {
				sc->errata |= PENDING_STUCK;
				return (rv);
			}
			cfid = PN8_STA_CFID(status);
			COUNT_OFF_IRT(sc->irt);

			vco_cfid = FID_TO_VCO_FID(cfid);
		}

		rv = pn8_write_fidvid(fid, cvid,
		    sc->pll * (uint64_t) sc->fsb,
		    &status);
		if (rv) {
			sc->errata |= PENDING_STUCK;
			return (rv);
		}
		cfid = PN8_STA_CFID(status);
		COUNT_OFF_IRT(sc->irt);
	}

	/* Phase 3: change to requested voltage */
	if (cvid != vid) {
		rv = pn8_write_fidvid(cfid, vid, 1ULL, &status);
		cvid = PN8_STA_CVID(status);
		COUNT_OFF_VST(sc->vst);
	}

	/* Check if transition failed. */
	if (cfid != fid || cvid != vid)
		rv = ENXIO;

	return (rv);
}