drm: Add via unichrome support

Add DRM device driver for VIA Unichrome chipsets

From: Unichrome Project http://unichrome.sf.net, Erdi Chen, Thomas Hellstrom    Signed-off-by: Dave Airlie <airlied@linux.ie>

1 files changed, 358 insertions, 0 deletions

diff --git a/drivers/char/drm/via_mm.c b/drivers/char/drm/via_mm.c
new file mode 100644
index 00000000000..c22712f44d4
--- /dev/null
+++ b/drivers/char/drm/via_mm.c
@@ -0,0 +1,358 @@
+/*
+ * Copyright 1998-2003 VIA Technologies, Inc. All Rights Reserved.
+ * Copyright 2001-2003 S3 Graphics, Inc. All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sub license,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * VIA, S3 GRAPHICS, AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+#include "drmP.h"
+#include "via_drm.h"
+#include "via_drv.h"
+#include "via_ds.h"
+#include "via_mm.h"
+
+#define MAX_CONTEXT 100
+
+typedef struct {
+	int used;
+	int context;
+	set_t *sets[2];		/* 0 for frame buffer, 1 for AGP , 2 for System */
+} via_context_t;
+
+static via_context_t global_ppriv[MAX_CONTEXT];
+
+static int via_agp_alloc(drm_via_mem_t * mem);
+static int via_agp_free(drm_via_mem_t * mem);
+static int via_fb_alloc(drm_via_mem_t * mem);
+static int via_fb_free(drm_via_mem_t * mem);
+
+static int add_alloc_set(int context, int type, unsigned int val)
+{
+	int i, retval = 0;
+
+	for (i = 0; i < MAX_CONTEXT; i++) {
+		if (global_ppriv[i].used && global_ppriv[i].context == context) {
+			retval = via_setAdd(global_ppriv[i].sets[type], val);
+			break;
+		}
+	}
+
+	return retval;
+}
+
+static int del_alloc_set(int context, int type, unsigned int val)
+{
+	int i, retval = 0;
+
+	for (i = 0; i < MAX_CONTEXT; i++)
+		if (global_ppriv[i].used && global_ppriv[i].context == context) {
+			retval = via_setDel(global_ppriv[i].sets[type], val);
+			break;
+		}
+
+	return retval;
+}
+
+/* agp memory management */
+static memHeap_t *AgpHeap = NULL;
+
+int via_agp_init(DRM_IOCTL_ARGS)
+{
+	drm_via_agp_t agp;
+
+	DRM_COPY_FROM_USER_IOCTL(agp, (drm_via_agp_t *) data, sizeof(agp));
+
+	AgpHeap = via_mmInit(agp.offset, agp.size);
+
+	DRM_DEBUG("offset = %lu, size = %lu", (unsigned long)agp.offset, (unsigned long)agp.size);
+
+	return 0;
+}
+
+/* fb memory management */
+static memHeap_t *FBHeap = NULL;
+
+int via_fb_init(DRM_IOCTL_ARGS)
+{
+	drm_via_fb_t fb;
+
+	DRM_COPY_FROM_USER_IOCTL(fb, (drm_via_fb_t *) data, sizeof(fb));
+
+	FBHeap = via_mmInit(fb.offset, fb.size);
+
+	DRM_DEBUG("offset = %lu, size = %lu", (unsigned long)fb.offset, (unsigned long)fb.size);
+
+	return 0;
+}
+
+int via_init_context(struct drm_device *dev, int context)
+{
+	int i;
+
+	for (i = 0; i < MAX_CONTEXT; i++)
+		if (global_ppriv[i].used &&
+		    (global_ppriv[i].context == context))
+			break;
+
+	if (i >= MAX_CONTEXT) {
+		for (i = 0; i < MAX_CONTEXT; i++) {
+			if (!global_ppriv[i].used) {
+				global_ppriv[i].context = context;
+				global_ppriv[i].used = 1;
+				global_ppriv[i].sets[0] = via_setInit();
+				global_ppriv[i].sets[1] = via_setInit();
+				DRM_DEBUG("init allocation set, socket=%d,"
+					  " context = %d\n", i, context);
+				break;
+			}
+		}
+
+		if ((i >= MAX_CONTEXT) || (global_ppriv[i].sets[0] == NULL) ||
+		    (global_ppriv[i].sets[1] == NULL)) {
+			return 0;
+		}
+	}
+
+	return 1;
+}
+
+int via_final_context(struct drm_device *dev, int context)
+{	
+        int i;
+	drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
+
+	for (i = 0; i < MAX_CONTEXT; i++)
+		if (global_ppriv[i].used &&
+		    (global_ppriv[i].context == context))
+			break;
+
+	if (i < MAX_CONTEXT) {
+		set_t *set;
+		ITEM_TYPE item;
+		int retval;
+
+		DRM_DEBUG("find socket %d, context = %d\n", i, context);
+
+		/* Video Memory */
+		set = global_ppriv[i].sets[0];
+		retval = via_setFirst(set, &item);
+		while (retval) {
+			DRM_DEBUG("free video memory 0x%lx\n", item);
+			via_mmFreeMem((PMemBlock) item);
+			retval = via_setNext(set, &item);
+		}
+		via_setDestroy(set);
+
+		/* AGP Memory */
+		set = global_ppriv[i].sets[1];
+		retval = via_setFirst(set, &item);
+		while (retval) {
+			DRM_DEBUG("free agp memory 0x%lx\n", item);
+			via_mmFreeMem((PMemBlock) item);
+			retval = via_setNext(set, &item);
+		}
+		via_setDestroy(set);
+		global_ppriv[i].used = 0;
+	}
+	via_release_futex(dev_priv, context); 
+	
+			
+#if defined(__linux__)
+	/* Linux specific until context tracking code gets ported to BSD */
+	/* Last context, perform cleanup */
+	if (dev->ctx_count == 1 && dev->dev_private) {
+	        DRM_DEBUG("Last Context\n");
+		if (dev->irq)
+			drm_irq_uninstall(dev);
+
+		via_cleanup_futex(dev_priv);
+		via_do_cleanup_map(dev);
+	}
+#endif
+
+	return 1;
+}
+
+int via_mem_alloc(DRM_IOCTL_ARGS)
+{
+	drm_via_mem_t mem;
+
+	DRM_COPY_FROM_USER_IOCTL(mem, (drm_via_mem_t *) data, sizeof(mem));
+
+	switch (mem.type) {
+	case VIDEO:
+		if (via_fb_alloc(&mem) < 0)
+			return -EFAULT;
+		DRM_COPY_TO_USER_IOCTL((drm_via_mem_t *) data, mem,
+				       sizeof(mem));
+		return 0;
+	case AGP:
+		if (via_agp_alloc(&mem) < 0)
+			return -EFAULT;
+		DRM_COPY_TO_USER_IOCTL((drm_via_mem_t *) data, mem,
+				       sizeof(mem));
+		return 0;
+	}
+
+	return -EFAULT;
+}
+
+static int via_fb_alloc(drm_via_mem_t * mem)
+{
+	drm_via_mm_t fb;
+	PMemBlock block;
+	int retval = 0;
+
+	if (!FBHeap)
+		return -1;
+
+	fb.size = mem->size;
+	fb.context = mem->context;
+
+	block = via_mmAllocMem(FBHeap, fb.size, 5, 0);
+	if (block) {
+		fb.offset = block->ofs;
+		fb.free = (unsigned long)block;
+		if (!add_alloc_set(fb.context, VIDEO, fb.free)) {
+			DRM_DEBUG("adding to allocation set fails\n");
+			via_mmFreeMem((PMemBlock) fb.free);
+			retval = -1;
+		}
+	} else {
+		fb.offset = 0;
+		fb.size = 0;
+		fb.free = 0;
+		retval = -1;
+	}
+
+	mem->offset = fb.offset;
+	mem->index = fb.free;
+
+	DRM_DEBUG("alloc fb, size = %d, offset = %d\n", fb.size,
+		  (int)fb.offset);
+
+	return retval;
+}
+
+static int via_agp_alloc(drm_via_mem_t * mem)
+{
+	drm_via_mm_t agp;
+	PMemBlock block;
+	int retval = 0;
+
+	if (!AgpHeap)
+		return -1;
+
+	agp.size = mem->size;
+	agp.context = mem->context;
+
+	block = via_mmAllocMem(AgpHeap, agp.size, 5, 0);
+	if (block) {
+		agp.offset = block->ofs;
+		agp.free = (unsigned long)block;
+		if (!add_alloc_set(agp.context, AGP, agp.free)) {
+			DRM_DEBUG("adding to allocation set fails\n");
+			via_mmFreeMem((PMemBlock) agp.free);
+			retval = -1;
+		}
+	} else {
+		agp.offset = 0;
+		agp.size = 0;
+		agp.free = 0;
+	}
+
+	mem->offset = agp.offset;
+	mem->index = agp.free;
+
+	DRM_DEBUG("alloc agp, size = %d, offset = %d\n", agp.size,
+		  (unsigned int)agp.offset);
+	return retval;
+}
+
+int via_mem_free(DRM_IOCTL_ARGS)
+{
+	drm_via_mem_t mem;
+
+	DRM_COPY_FROM_USER_IOCTL(mem, (drm_via_mem_t *) data, sizeof(mem));
+
+	switch (mem.type) {
+
+	case VIDEO:
+		if (via_fb_free(&mem) == 0)
+			return 0;
+		break;
+	case AGP:
+		if (via_agp_free(&mem) == 0)
+			return 0;
+		break;
+	}
+
+	return -EFAULT;
+}
+
+static int via_fb_free(drm_via_mem_t * mem)
+{
+	drm_via_mm_t fb;
+	int retval = 0;
+
+	if (!FBHeap) {
+		return -1;
+	}
+
+	fb.free = mem->index;
+	fb.context = mem->context;
+
+	if (!fb.free) {
+		return -1;
+
+	}
+
+	via_mmFreeMem((PMemBlock) fb.free);
+
+	if (!del_alloc_set(fb.context, VIDEO, fb.free)) {
+		retval = -1;
+	}
+
+	DRM_DEBUG("free fb, free = %ld\n", fb.free);
+
+	return retval;
+}
+
+static int via_agp_free(drm_via_mem_t * mem)
+{
+	drm_via_mm_t agp;
+
+	int retval = 0;
+
+	agp.free = mem->index;
+	agp.context = mem->context;
+
+	if (!agp.free)
+		return -1;
+
+	via_mmFreeMem((PMemBlock) agp.free);
+
+	if (!del_alloc_set(agp.context, AGP, agp.free)) {
+		retval = -1;
+	}
+
+	DRM_DEBUG("free agp, free = %ld\n", agp.free);
+
+	return retval;
+}