1 files changed, 372 insertions, 0 deletions
diff --git a/drivers/mfd/glamo/glamo-buffer.c b/drivers/mfd/glamo/glamo-buffer.c
new file mode 100644
index 00000000000..2bf9fb538cd
--- /dev/null
+++ b/drivers/mfd/glamo/glamo-buffer.c
@@ -0,0 +1,372 @@
+/*
+ * SMedia Glamo 336x/337x memory management
+ *
+ * Copyright (c) 2009 Thomas White <taw@bitwiz.org.uk>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ *
+ * Memory mapping functions based on i915_gem.c, to which the following
+ * notice applies:
+ *
+ * Copyright © 2008 Intel Corporation
+ *
+ * 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, sublicense,
+ * 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 NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS 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.
+ *
+ * Authors:
+ *    Eric Anholt <eric@anholt.net>
+ */
+
+
+#include <drm/drmP.h>
+#include <drm/glamo_drm.h>
+
+#include "glamo-drm-private.h"
+#include "glamo-cmdq.h"	/* For glamo_cmdq_blank() */
+
+
+struct drm_gem_object *glamo_gem_object_alloc(struct drm_device *dev, int size,
+                                              int alignment)
+{
+	struct drm_gem_object *obj;
+	struct glamodrm_handle *gdrm;
+	struct drm_glamo_gem_object *gobj;
+
+	gdrm = dev->dev_private;
+
+	size = roundup(size, PAGE_SIZE);
+
+	obj = drm_gem_object_alloc(dev, size);
+	if (obj == NULL) return NULL;
+
+	/* See glamodrm_gem_init_object() below */
+	gobj = obj->driver_private;
+
+	/* Allocate memory for this object in VRAM */
+	gobj->block = drm_mm_search_free(gdrm->mmgr, size, alignment, 1);
+	if (!gobj->block) {
+		goto fail;
+	}
+	gobj->block = drm_mm_get_block(gobj->block, size, alignment);
+	if (!gobj->block) {
+		goto fail;
+	}
+
+	/* Arrange for the contents to be set to zero */
+	glamo_cmdq_blank(gdrm, obj);
+
+	return obj;
+
+fail:
+	mutex_lock(&dev->struct_mutex);
+	drm_gem_object_unreference(obj);
+	mutex_unlock(&dev->struct_mutex);
+	printk(KERN_INFO "[glamo-drm] Failed to allocate object\n");
+
+	return NULL;
+}
+
+
+int glamo_ioctl_gem_create(struct drm_device *dev, void *data,
+			   struct drm_file *file_priv)
+{
+	struct drm_glamo_gem_create *args = data;
+	struct drm_gem_object *obj;
+	int handle, ret, alignment, size;
+
+	/* Alignment must be a non-zero multiple of 2 */
+	alignment = args->alignment;
+	if ( alignment < 2 ) alignment = 2;
+	if ( alignment % 2 ) alignment *= 2;
+
+	/* Size must be similarly sanitised */
+	size = args->size;
+	if ( size < 2 ) size = 2;
+	if ( size % 2 ) size += 1;
+
+	/* Create an object */
+	obj = glamo_gem_object_alloc(dev, size, alignment);
+	if ( obj == NULL ) return -ENOMEM;
+
+	/* Create a handle for it */
+	ret = drm_gem_handle_create(file_priv, obj, &handle);
+	mutex_lock(&dev->struct_mutex);
+	drm_gem_object_handle_unreference(obj);
+	mutex_unlock(&dev->struct_mutex);
+	if (ret) goto fail;
+
+	/* Return */
+	args->handle = handle;
+	return 0;
+
+fail:
+	mutex_lock(&dev->struct_mutex);
+	drm_gem_object_unreference(obj);
+	mutex_unlock(&dev->struct_mutex);
+	printk(KERN_INFO "[glamo-drm] Failed to allocate object\n");
+	return ret;
+}
+
+
+int glamodrm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
+{
+	struct drm_gem_object *obj = vma->vm_private_data;
+	struct drm_device *dev = obj->dev;
+	struct drm_glamo_gem_object *gobj = obj->driver_private;
+	struct glamodrm_handle *gdrm = dev->dev_private;
+	pgoff_t page_offset;
+	unsigned long pfn;
+	int ret = 0;
+
+	/* We don't use vmf->pgoff since that has the fake offset */
+	page_offset = ((unsigned long)vmf->virtual_address - vma->vm_start) >>
+	               PAGE_SHIFT;
+
+	mutex_lock(&dev->struct_mutex);
+	pfn = ((gdrm->vram->start + GLAMO_OFFSET_FB + gobj->block->start)
+	       >> PAGE_SHIFT) + page_offset;
+	ret = vm_insert_pfn(vma, (unsigned long)vmf->virtual_address, pfn);
+	mutex_unlock(&dev->struct_mutex);
+
+	switch (ret) {
+	case -ENOMEM:
+	case -EAGAIN:
+		return VM_FAULT_OOM;
+	case -EFAULT:
+	case -EBUSY:
+		DRM_ERROR("can't insert pfn??  fault or busy...\n");
+		return VM_FAULT_SIGBUS;
+	default:
+		return VM_FAULT_NOPAGE;
+	}
+}
+
+
+static int glamo_gem_create_mmap_offset(struct drm_gem_object *obj)
+{
+	struct drm_device *dev = obj->dev;
+	struct drm_gem_mm *mm = dev->mm_private;
+	struct drm_glamo_gem_object *gobj = obj->driver_private;
+	struct drm_map_list *list;
+	struct drm_map *map;
+	int ret = 0;
+
+	/* Set the object up for mmap'ing */
+	list = &obj->map_list;
+	list->map = drm_calloc(1, sizeof(struct drm_map_list), DRM_MEM_DRIVER);
+	if (!list->map)
+		return -ENOMEM;
+
+	map = list->map;
+	map->type = _DRM_GEM;
+	map->size = obj->size;
+	map->handle = obj;
+
+	/* Get a DRM GEM mmap offset allocated... */
+	list->file_offset_node = drm_mm_search_free(&mm->offset_manager,
+	                                            obj->size / PAGE_SIZE, 0, 0);
+	if (!list->file_offset_node) {
+		DRM_ERROR("failed to allocate offset for bo %d\n", obj->name);
+		ret = -ENOMEM;
+		goto out_free_list;
+	}
+
+	list->file_offset_node = drm_mm_get_block(list->file_offset_node,
+						  obj->size / PAGE_SIZE, 0);
+	if (!list->file_offset_node) {
+		ret = -ENOMEM;
+		goto out_free_list;
+	}
+
+	list->hash.key = list->file_offset_node->start;
+	if (drm_ht_insert_item(&mm->offset_hash, &list->hash)) {
+		DRM_ERROR("failed to add to map hash\n");
+		goto out_free_mm;
+	}
+
+	/* By now we should be all set, any drm_mmap request on the offset
+	 * below will get to our mmap & fault handler */
+	gobj->mmap_offset = ((uint64_t) list->hash.key) << PAGE_SHIFT;
+
+	return 0;
+
+out_free_mm:
+	drm_mm_put_block(list->file_offset_node);
+out_free_list:
+	drm_free(list->map, sizeof(struct drm_map_list), DRM_MEM_DRIVER);
+
+	return ret;
+}
+
+
+int glamo_ioctl_gem_mmap(struct drm_device *dev, void *data,
+			 struct drm_file *file_priv)
+{
+	struct drm_glamo_gem_mmap *args = data;
+	struct drm_gem_object *obj;
+	struct drm_glamo_gem_object *gobj;
+	int ret;
+
+	obj = drm_gem_object_lookup(dev, file_priv, args->handle);
+	if (obj == NULL)
+		return -EBADF;
+
+	mutex_lock(&dev->struct_mutex);
+
+	gobj = obj->driver_private;
+	if (!gobj->mmap_offset) {
+		ret = glamo_gem_create_mmap_offset(obj);
+		if (ret) {
+			mutex_unlock(&dev->struct_mutex);
+			return ret;
+		}
+	}
+
+	args->offset = gobj->mmap_offset;
+
+	drm_gem_object_unreference(obj);
+	mutex_unlock(&dev->struct_mutex);
+
+	return 0;
+}
+
+
+int glamo_ioctl_gem_pin(struct drm_device *dev, void *data,
+			struct drm_file *file_priv)
+{
+	printk(KERN_INFO "glamo_ioctl_gem_pin\n");
+	return 0;
+}
+
+
+int glamo_ioctl_gem_unpin(struct drm_device *dev, void *data,
+			  struct drm_file *file_priv)
+{
+	printk(KERN_INFO "glamo_ioctl_gem_unpin\n");
+	return 0;
+}
+
+
+int glamo_ioctl_gem_pread(struct drm_device *dev, void *data,
+			  struct drm_file *file_priv)
+{
+	printk(KERN_INFO "glamo_ioctl_gem_pread\n");
+	return 0;
+}
+
+
+int glamo_ioctl_gem_pwrite(struct drm_device *dev, void *data,
+			   struct drm_file *file_priv)
+{
+	printk(KERN_INFO "glamo_ioctl_gem_pwrite\n");
+	return 0;
+}
+
+
+int glamodrm_gem_init_object(struct drm_gem_object *obj)
+{
+	struct drm_glamo_gem_object *gobj;
+
+	/* Allocate a private structure */
+	gobj = drm_calloc(1, sizeof(*gobj), DRM_MEM_DRIVER);
+	if (!gobj) return -ENOMEM;
+
+	obj->driver_private = gobj;
+	gobj->obj = obj;
+
+	return 0;
+}
+
+
+void glamodrm_gem_free_object(struct drm_gem_object *obj)
+{
+	struct drm_glamo_gem_object *gobj;
+	struct drm_map_list *list;
+	struct drm_device *dev;
+	struct drm_gem_mm *mm;
+	struct drm_map *map;
+
+	dev = obj->dev;
+	mm = dev->mm_private;
+	gobj = obj->driver_private;
+
+	/* Free the VRAM */
+	if ( gobj->block != NULL ) {
+		drm_mm_put_block(gobj->block);
+	}
+
+	/* Release mappings */
+	list = &obj->map_list;
+	drm_ht_remove_item(&mm->offset_hash, &list->hash);
+	if (list->file_offset_node) {
+		drm_mm_put_block(list->file_offset_node);
+		list->file_offset_node = NULL;
+	}
+	map = list->map;
+	if (map) {
+		drm_free(map, sizeof(*map), DRM_MEM_DRIVER);
+		list->map = NULL;
+	}
+
+	/* Free the private structure */
+	drm_free(obj->driver_private, 1, DRM_MEM_DRIVER);
+}
+
+
+/* Memory management initialisation */
+int glamo_buffer_init(struct glamodrm_handle *gdrm)
+{
+	gdrm->mmgr = drm_calloc(1, sizeof(struct drm_mm), DRM_MEM_DRIVER);
+	drm_mm_init(gdrm->mmgr, 0, gdrm->vram_size);
+
+	/* Reserve a scratch buffer.  We do this outside the protections
+	 * of the other GEM code.  To do this safely, the allocation must
+	 * be a multiple of PAGE_SIZE. */
+	gdrm->scratch = drm_mm_search_free(gdrm->mmgr, PAGE_SIZE, 4, 1);
+	if ( gdrm->scratch ) {
+		gdrm->scratch = drm_mm_get_block(gdrm->scratch, PAGE_SIZE, 4);
+	}
+	if ( !gdrm->scratch ) {
+		printk(KERN_WARNING "[glamo-drm] Couldn't allocate"
+		                    " scratch buffer!\n");
+	}
+
+	return 0;
+}
+
+
+/* Memory management finalisation */
+int glamo_buffer_final(struct glamodrm_handle *gdrm)
+{
+	drm_mm_takedown(gdrm->mmgr);
+	drm_free(gdrm->mmgr , 1, DRM_MEM_DRIVER);
+	return 0;
+}