From 6a0fbc64aa6688c5a8c011d341605bb008bfb97c Mon Sep 17 00:00:00 2001
From: oga <oga@openbsd.org>
Date: Sat, 7 Aug 2010 19:32:44 +0000
Subject: [PATCH] Suspend/resume for agp_amd.c

Note: the unconditional restore of the status register is ok because all
of the bits are either ones we want to preserve or read-only.

ok deraadt@
---
 sys/dev/pci/agp_amd.c | 57 +++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 55 insertions(+), 2 deletions(-)

diff --git a/sys/dev/pci/agp_amd.c b/sys/dev/pci/agp_amd.c
index 7e40096dfd7..2256fd2798e 100644
--- a/sys/dev/pci/agp_amd.c
+++ b/sys/dev/pci/agp_amd.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: agp_amd.c,v 1.15 2010/04/08 00:23:53 tedu Exp $	*/
+/*	$OpenBSD: agp_amd.c,v 1.16 2010/08/07 19:32:44 oga Exp $	*/
 /*	$NetBSD: agp_amd.c,v 1.6 2001/10/06 02:48:50 thorpej Exp $	*/
 
 /*-
@@ -73,9 +73,15 @@ struct agp_amd_softc {
 	bus_space_tag_t		 iot;
 	bus_addr_t		 asc_apaddr;
 	bus_size_t		 asc_apsize;
+	pcireg_t		 asc_apctrl;
+	pcireg_t		 asc_modectrl;
+	u_int16_t		 asc_status;
 };
 
 void	agp_amd_attach(struct device *, struct device *, void *);
+int	agp_amd_activate(struct device *, int);
+void	agp_amd_save(struct agp_amd_softc *);
+void	agp_amd_restore(struct agp_amd_softc *);
 int	agp_amd_probe(struct device *, void *, void *);
 bus_size_t agp_amd_get_aperture(void *);
 struct agp_amd_gatt *agp_amd_alloc_gatt(bus_dma_tag_t, bus_size_t);
@@ -85,7 +91,8 @@ void	agp_amd_unbind_page(void *, bus_size_t);
 void	agp_amd_flush_tlb(void *);
 
 struct cfattach amdagp_ca = {
-	sizeof(struct agp_amd_softc), agp_amd_probe, agp_amd_attach
+	sizeof(struct agp_amd_softc), agp_amd_probe, agp_amd_attach, NULL,
+	agp_amd_activate
 };
 
 struct cfdriver amdagp_cd = {
@@ -269,6 +276,52 @@ agp_amd_detach(void *sc)
 }
 #endif
 
+int
+agp_amd_activate(struct device *arg, int act)
+{
+	struct agp_amd_softc *asc = (struct agp_amd_softc *)arg;
+
+	switch (act) {
+	case DVACT_SUSPEND:
+		agp_amd_save(asc);
+		break;
+	case DVACT_RESUME:
+		agp_amd_restore(asc);
+		break;
+	}
+
+	return (0);
+}
+
+void
+agp_amd_save(struct agp_amd_softc *asc)
+{
+	asc->asc_apctrl = pci_conf_read(asc->asc_pc, asc->asc_tag,
+	    AGP_AMD751_APCTRL);
+	asc->asc_modectrl = pci_conf_read(asc->asc_pc, asc->asc_tag,
+	    AGP_AMD751_MODECTRL);
+	asc->asc_status = READ2(AGP_AMD751_STATUS);
+}
+
+void
+agp_amd_restore(struct agp_amd_softc *asc)
+{
+
+	/* restore aperture size */
+	pci_conf_write(asc->asc_pc, asc->asc_tag, AGP_AMD751_APCTRL,
+	    asc->asc_apctrl);
+
+	/* Install the gatt. */
+	WRITE4(AGP_AMD751_ATTBASE, asc->gatt->ag_physical);
+
+	/* Reenable synchronisation between host and agp. */
+	pci_conf_write(asc->asc_pc, asc->asc_tag, AGP_AMD751_MODECTRL,
+	    asc->asc_modectrl);
+	/* Enable the TLB and flush */
+	WRITE2(AGP_AMD751_STATUS, asc->asc_status);
+	agp_amd_flush_tlb(asc);
+}
+
 bus_size_t
 agp_amd_get_aperture(void *sc)
 {
-- 
2.20.1