From 75ba69865bfe4115dc0abd89e7116dfe99868537 Mon Sep 17 00:00:00 2001
From: deraadt <deraadt@openbsd.org>
Date: Sat, 7 Aug 2010 06:10:04 +0000
Subject: [PATCH] On resume, re-activate the host RNG on the host bridges that
 need it. ok kettenis

---
 sys/arch/amd64/pci/pchb.c | 30 ++++++++++++++++++++++++++++--
 sys/arch/i386/pci/pchb.c  | 30 ++++++++++++++++++++++++++++--
 2 files changed, 56 insertions(+), 4 deletions(-)

diff --git a/sys/arch/amd64/pci/pchb.c b/sys/arch/amd64/pci/pchb.c
index f42b042f042..e715e3097c4 100644
--- a/sys/arch/amd64/pci/pchb.c
+++ b/sys/arch/amd64/pci/pchb.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: pchb.c,v 1.34 2010/06/24 00:06:57 kettenis Exp $	*/
+/*	$OpenBSD: pchb.c,v 1.35 2010/08/07 06:10:04 deraadt Exp $	*/
 /*	$NetBSD: pchb.c,v 1.1 2003/04/26 18:39:50 fvdl Exp $	*/
 /*
  * Copyright (c) 2000 Michael Shalayeff
@@ -108,6 +108,7 @@ struct pchb_softc {
 	bus_space_handle_t sc_bh;
 
 	/* rng stuff */
+	int sc_rng_active;
 	int sc_rng_ax;
 	int sc_rng_i;
 	struct timeout sc_rng_to;
@@ -115,10 +116,11 @@ struct pchb_softc {
 
 int	pchbmatch(struct device *, void *, void *);
 void	pchbattach(struct device *, struct device *, void *);
+int	pchbactivate(struct device *, int);
 
 struct cfattach pchb_ca = {
 	sizeof(struct pchb_softc), pchbmatch, pchbattach, NULL,
-	config_activate_children
+	pchbactivate
 };
 
 struct cfdriver pchb_cd = {
@@ -202,6 +204,7 @@ pchbattach(struct device *parent, struct device *self, void *aux)
 			timeout_set(&sc->sc_rng_to, pchb_rnd, sc);
 			sc->sc_rng_i = 4;
 			pchb_rnd(sc);
+			sc->sc_rng_active = 1;
 			break;
 		}
 		printf("\n");
@@ -269,6 +272,29 @@ pchbattach(struct device *parent, struct device *self, void *aux)
 	config_found(self, &pba, pchb_print);
 }
 
+int
+pchbactivate(struct device *self, int act)
+{
+	struct pchb_softc *sc = (struct pchb_softc *)self;
+
+	switch (act) {
+	case DVACT_SUSPEND:
+		config_activate_children(self, act);
+		break;
+	case DVACT_RESUME:
+		/* re-enable RNG, if we have it */
+		if (sc->sc_rng_active)
+			bus_space_write_1(sc->sc_bt, sc->sc_bh,
+			    I82802_RNG_HWST,
+			    bus_space_read_1(sc->sc_bt, sc->sc_bh,
+			    I82802_RNG_HWST) | I82802_RNG_HWST_ENABLE);
+		config_activate_children(self, act);
+		break;
+	}
+	return (0);
+}
+
+
 int
 pchb_print(void *aux, const char *pnp)
 {
diff --git a/sys/arch/i386/pci/pchb.c b/sys/arch/i386/pci/pchb.c
index c2839350918..3b594a5a269 100644
--- a/sys/arch/i386/pci/pchb.c
+++ b/sys/arch/i386/pci/pchb.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: pchb.c,v 1.82 2010/06/24 00:06:57 kettenis Exp $ */
+/*	$OpenBSD: pchb.c,v 1.83 2010/08/07 06:10:06 deraadt Exp $ */
 /*	$NetBSD: pchb.c,v 1.65 2007/08/15 02:26:13 markd Exp $	*/
 
 /*
@@ -120,6 +120,7 @@ struct pchb_softc {
 	bus_space_handle_t sc_bh;
 
 	/* rng stuff */
+	int sc_rng_active;
 	int sc_rng_ax;
 	int sc_rng_i;
 	struct timeout sc_rng_to;
@@ -127,10 +128,11 @@ struct pchb_softc {
 
 int	pchbmatch(struct device *, void *, void *);
 void	pchbattach(struct device *, struct device *, void *);
+int	pchbactivate(struct device *, int);
 
 struct cfattach pchb_ca = {
 	sizeof(struct pchb_softc), pchbmatch, pchbattach, NULL,
-	config_activate_children
+	pchbactivate
 };
 
 struct cfdriver pchb_cd = {
@@ -345,6 +347,7 @@ pchbattach(struct device *parent, struct device *self, void *aux)
 			timeout_set(&sc->sc_rng_to, pchb_rnd, sc);
 			sc->sc_rng_i = 4;
 			pchb_rnd(sc);
+			sc->sc_rng_active = 1;
 			break;
 		}
 		printf("\n");
@@ -412,6 +415,29 @@ pchbattach(struct device *parent, struct device *self, void *aux)
 	config_found(self, &pba, pchb_print);
 }
 
+int
+pchbactivate(struct device *self, int act)
+{
+	struct pchb_softc *sc = (struct pchb_softc *)self;
+
+	switch (act) {
+	case DVACT_SUSPEND:
+		config_activate_children(self, act);
+		break;
+	case DVACT_RESUME:
+		/* re-enable RNG, if we have it */
+		if (sc->sc_rng_active)
+			bus_space_write_1(sc->sc_bt, sc->sc_bh,
+			    I82802_RNG_HWST,
+			    bus_space_read_1(sc->sc_bt, sc->sc_bh,
+			    I82802_RNG_HWST) | I82802_RNG_HWST_ENABLE);
+		config_activate_children(self, act);
+		break;
+	}
+	return (0);
+}
+
+
 int
 pchb_print(void *aux, const char *pnp)
 {
-- 
2.20.1