From c21a7b763ad31c3473ba2c9a1a01bb729bc13bb5 Mon Sep 17 00:00:00 2001
From: Thomas Hellstrom <thomas@tungstengraphics.com>
Date: Wed, 5 Jul 2006 15:52:35 +0000
Subject: SiS 315 Awareness.

---
 linux-core/sis_drv.c       |  1 +
 linux-core/sis_mm.c        | 72 ++++++++++++++++++++++++++++++++++++++++++++++
 shared-core/drm_pciids.txt |  1 +
 shared-core/sis_drv.h      | 16 +++++++++--
 4 files changed, 87 insertions(+), 3 deletions(-)

diff --git a/linux-core/sis_drv.c b/linux-core/sis_drv.c
index 4119bc3c..3fdbd88e 100644
--- a/linux-core/sis_drv.c
+++ b/linux-core/sis_drv.c
@@ -73,6 +73,7 @@ static struct drm_driver driver = {
         .load = sis_driver_load,
         .unload = sis_driver_unload,
 	.context_dtor = NULL,
+        .dma_quiescent = sis_idle,
 	.reclaim_buffers = NULL,
 	.reclaim_buffers_locked = sis_reclaim_buffers_locked,
 	.lastclose = sis_lastclose,
diff --git a/linux-core/sis_mm.c b/linux-core/sis_mm.c
index a89ed64b..70e2fac4 100644
--- a/linux-core/sis_mm.c
+++ b/linux-core/sis_mm.c
@@ -232,6 +232,77 @@ 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;
@@ -243,6 +314,7 @@ 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;
 	up(&dev->struct_sem);
 }
 
diff --git a/shared-core/drm_pciids.txt b/shared-core/drm_pciids.txt
index a86e4a24..e4415c16 100644
--- a/shared-core/drm_pciids.txt
+++ b/shared-core/drm_pciids.txt
@@ -201,6 +201,7 @@
 0x1039 0x0300 0 "SiS 300/305"
 0x1039 0x5300 0 "SiS 540"
 0x1039 0x6300 0 "SiS 630"
+0x1039 0x6330 SIS_CHIP_315 "SiS 661"
 0x1039 0x7300 0 "SiS 730"
 
 [tdfx]
diff --git a/shared-core/sis_drv.h b/shared-core/sis_drv.h
index 636e5327..ab3e9ae4 100644
--- a/shared-core/sis_drv.h
+++ b/shared-core/sis_drv.h
@@ -31,21 +31,30 @@
 /* General customization:
  */
 
-#define DRIVER_AUTHOR		"SIS"
+#define DRIVER_AUTHOR		"SIS, Tungsten Graphics"
 #define DRIVER_NAME		"sis"
 #define DRIVER_DESC		"SIS 300/630/540"
-#define DRIVER_DATE		"20060619"
+#define DRIVER_DATE		"20060704"
 #define DRIVER_MAJOR		1
 #define DRIVER_MINOR		2
 #define DRIVER_PATCHLEVEL	1
 
+enum sis_family {
+        SIS_OTHER = 0,
+        SIS_CHIP_315 = 1,
+};
+
 #if defined(__linux__)
 #define SIS_HAVE_CORE_MM
 #endif
 
 #ifdef SIS_HAVE_CORE_MM
-
 #include "drm_sman.h"
+
+#define SIS_BASE (dev_priv->mmio)
+#define SIS_READ(reg)         DRM_READ32(SIS_BASE, reg);
+#define SIS_WRITE(reg, val)   DRM_WRITE32(SIS_BASE, reg, val);
+
 typedef struct drm_sis_private {
         drm_local_map_t *mmio;
         unsigned idle_fault;
@@ -57,6 +66,7 @@ typedef struct drm_sis_private {
         unsigned long agp_offset;
 } drm_sis_private_t;
 
+extern int sis_idle(drm_device_t *dev);
 extern void sis_reclaim_buffers_locked(drm_device_t *dev, struct file *filp);
 extern void sis_lastclose(drm_device_t *dev);
 
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