drm: SiS 315 Awareness.

Add support for the SiS 315 to the DRM.

Signed-off-by: Dave Airlie <airlied@linux.ie>

1 files changed, 71 insertions, 0 deletions

diff --git a/drivers/char/drm/sis_mm.c b/drivers/char/drm/sis_mm.c
index 0eb1dca232b7..3041c5b42d56 100644
--- a/drivers/char/drm/sis_mm.c
+++ b/drivers/char/drm/sis_mm.c
@@ -226,6 +226,76 @@ static int sis_ioctl_agp_alloc(DRM_IOCTL_ARGS)
         return sis_drm_alloc(dev, priv, data, AGP_TYPE);
 }
 
+static drm_local_map_t *sis_reg_init(drm_device_t *dev)
+{
+        drm_map_list_t *entry;
+        drm_local_map_t *map;
+
+        list_for_each_entry(entry, &dev->maplist->head, head) {
+                map = entry->map;
+                if (!map)
+                        continue;
+                if (map->type == _DRM_REGISTERS) {
+                        return map;
+                }
+        }
+        return NULL;
+}
+
+int sis_idle(drm_device_t *dev)
+{
+        drm_sis_private_t *dev_priv = dev->dev_private;
+        uint32_t idle_reg;
+        unsigned long end;
+        int i;
+
+        if (dev_priv->idle_fault)
+                return 0;
+
+        if (dev_priv->mmio == NULL) {
+                dev_priv->mmio = sis_reg_init(dev);
+                if (dev_priv->mmio == NULL) {
+                        DRM_ERROR("Could not find register map.\n");
+                        return 0;
+                }
+        }
+        
+        /*
+         * Implement a device switch here if needed
+         */
+
+        if (dev_priv->chipset != SIS_CHIP_315)
+                return 0;
+
+        /*
+         * Timeout after 3 seconds. We cannot use DRM_WAIT_ON here
+         * because its polling frequency is too low.
+         */
+
+        end = jiffies + (DRM_HZ * 3);
+
+        for (i=0; i<4; ++i) {
+                do {
+                        idle_reg = SIS_READ(0x85cc);
+                } while ( !time_after_eq(jiffies, end) &&
+                          ((idle_reg & 0x80000000) != 0x80000000));
+        }
+
+        if (time_after_eq(jiffies, end)) {
+                DRM_ERROR("Graphics engine idle timeout. "
+                          "Disabling idle check\n");
+                dev_priv->idle_fault = TRUE;
+        }
+
+        /*
+         * The caller never sees an error code. It gets trapped
+         * in libdrm.
+         */
+
+        return 0;
+}
+
+
 void sis_lastclose(struct drm_device *dev)
 {
         drm_sis_private_t *dev_priv = dev->dev_private;
@@ -237,6 +307,7 @@ void sis_lastclose(struct drm_device *dev)
         drm_sman_cleanup(&dev_priv->sman);
         dev_priv->vram_initialized = FALSE;
         dev_priv->agp_initialized = FALSE;
+        dev_priv->mmio = NULL;
         mutex_unlock(&dev->struct_mutex);
 }