Suspend/resume handler for sisagp save/restoring the gtt window/size and

tlb enable states before we go down and whacking them back in on
bringup.

``commit'' deraadt@

diff --git a/sys/dev/pci/agp_sis.c b/sys/dev/pci/agp_sis.c
index b08d3b9..9cda91e 100644 (file)
--- a/sys/dev/pci/agp_sis.c
+++ b/sys/dev/pci/agp_sis.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: agp_sis.c,v 1.14 2010/04/08 00:23:53 tedu Exp $       */
+/*     $OpenBSD: agp_sis.c,v 1.15 2010/08/07 18:09:09 oga Exp $        */
 /*     $NetBSD: agp_sis.c,v 1.2 2001/09/15 00:25:00 thorpej Exp $      */
 
 /*-
@@ -55,9 +55,13 @@ struct agp_sis_softc {
        pcitag_t                 ssc_tag;
        bus_addr_t               ssc_apaddr;
        bus_size_t               ssc_apsize;
+       pcireg_t                 ssc_winctrl; /* saved over suspend/resume */
 };
 
 void   agp_sis_attach(struct device *, struct device *, void *);
+int    agp_sis_activate(struct device *, int);
+void   agp_sis_save(struct agp_sis_softc *);
+void   agp_sis_restore(struct agp_sis_softc *);
 int    agp_sis_probe(struct device *, void *, void *);
 bus_size_t agp_sis_get_aperture(void *);
 int    agp_sis_set_aperture(void *, bus_size_t);
@@ -66,7 +70,8 @@ void  agp_sis_unbind_page(void *, bus_addr_t);
 void   agp_sis_flush_tlb(void *);
 
 struct cfattach sisagp_ca = {
-        sizeof(struct agp_sis_softc), agp_sis_probe, agp_sis_attach
+       sizeof(struct agp_sis_softc), agp_sis_probe, agp_sis_attach,
+       NULL, agp_sis_activate
 };
 
 struct cfdriver sisagp_cd = {
@@ -169,6 +174,45 @@ agp_sis_detach(struct agp_softc *sc)
 }
 #endif
 
+int
+agp_sis_activate(struct device *arg, int act)
+{
+       struct agp_sis_softc *ssc = (struct agp_sis_softc *)arg;
+
+       switch (act) {
+       case DVACT_SUSPEND:
+               agp_sis_save(ssc);
+               break;
+       case DVACT_RESUME:
+               agp_sis_restore(ssc);
+               break;
+       }
+
+       return (0);
+}
+
+void
+agp_sis_save(struct agp_sis_softc *ssc)
+{
+       ssc->ssc_winctrl = pci_conf_read(ssc->ssc_pc, ssc->ssc_tag,
+           AGP_SIS_WINCTRL);
+}
+
+void
+agp_sis_restore(struct agp_sis_softc *ssc)
+{
+       /* Install the gatt. */
+       pci_conf_write(ssc->ssc_pc, ssc->ssc_tag, AGP_SIS_ATTBASE,
+           ssc->gatt->ag_physical);
+       
+       /*
+        * Enable the aperture, reset the aperture size and enable and
+        * auto-tlb-inval.
+        */
+       pci_conf_write(ssc->ssc_pc, ssc->ssc_tag, AGP_SIS_WINCTRL,
+           ssc->ssc_winctrl);
+}
+
 bus_size_t
 agp_sis_get_aperture(void *sc)
 {