x86, gart: add resume handling

[linux-2.6-omap-h63xx.git] / arch / x86 / kernel / pci-gart_64.c

diff --git a/arch/x86/kernel/pci-gart_64.c b/arch/x86/kernel/pci-gart_64.c
index 3710097f02ebbaeefc009235cdc05b5a271c5584..f505c38903583dad2a856a2d7c3933f7d539b183 100644 (file)
--- a/arch/x86/kernel/pci-gart_64.c
+++ b/arch/x86/kernel/pci-gart_64.c
@@ -549,14 +549,63 @@ static __init unsigned read_aperture(struct pci_dev *dev, u32 *size)
        return aper_base;
 }
 
+static void enable_gart_translations(void)
+{
+       int i;
+
+       for (i = 0; i < num_k8_northbridges; i++) {
+               struct pci_dev *dev = k8_northbridges[i];
+
+               enable_gart_translation(dev, __pa(agp_gatt_table));
+       }
+}
+
+/*
+ * If fix_up_north_bridges is set, the north bridges have to be fixed up on
+ * resume in the same way as they are handled in gart_iommu_hole_init().
+ */
+static bool fix_up_north_bridges;
+static u32 aperture_order;
+static u32 aperture_alloc;
+
+void set_up_gart_resume(u32 aper_order, u32 aper_alloc)
+{
+       fix_up_north_bridges = true;
+       aperture_order = aper_order;
+       aperture_alloc = aper_alloc;
+}
+
 static int gart_resume(struct sys_device *dev)
 {
+       printk(KERN_INFO "PCI-DMA: Resuming GART IOMMU\n");
+
+       if (fix_up_north_bridges) {
+               int i;
+
+               printk(KERN_INFO "PCI-DMA: Restoring GART aperture settings\n");
+
+               for (i = 0; i < num_k8_northbridges; i++) {
+                       struct pci_dev *dev = k8_northbridges[i];
+
+                       /*
+                        * Don't enable translations just yet.  That is the next
+                        * step.  Restore the pre-suspend aperture settings.
+                        */
+                       pci_write_config_dword(dev, AMD64_GARTAPERTURECTL,
+                                               aperture_order << 1);
+                       pci_write_config_dword(dev, AMD64_GARTAPERTUREBASE,
+                                               aperture_alloc >> 25);
+               }
+       }
+
+       enable_gart_translations();
+
        return 0;
 }
 
 static int gart_suspend(struct sys_device *dev, pm_message_t state)
 {
-       return -EINVAL;
+       return 0;
 }
 
 static struct sysdev_class gart_sysdev_class = {
@@ -614,16 +663,14 @@ static __init int init_k8_gatt(struct agp_kern_info *info)
        memset(gatt, 0, gatt_size);
        agp_gatt_table = gatt;
 
-       for (i = 0; i < num_k8_northbridges; i++) {
-               dev = k8_northbridges[i];
-               enable_gart_translation(dev, __pa(gatt));
-       }
+       enable_gart_translations();
 
        error = sysdev_class_register(&gart_sysdev_class);
        if (!error)
                error = sysdev_register(&device_gart);
        if (error)
                panic("Could not register gart_sysdev -- would corrupt data on next suspend");
+
        flush_gart();
 
        printk(KERN_INFO "PCI-DMA: aperture base @ %x size %u KB\n",