1 files changed, 110 insertions, 0 deletions
diff --git a/drivers/gpu/drm/exynos/exynos_drm_buf.c b/drivers/gpu/drm/exynos/exynos_drm_buf.c
new file mode 100644
index 000000000000..6f8afea94fc9
--- /dev/null
+++ b/drivers/gpu/drm/exynos/exynos_drm_buf.c
@@ -0,0 +1,110 @@
+/* exynos_drm_buf.c
+ *
+ * Copyright (c) 2011 Samsung Electronics Co., Ltd.
+ * Author: Inki Dae <inki.dae@samsung.com>
+ *
+ * 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
+ * VA LINUX SYSTEMS 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 "drm.h"
+
+#include "exynos_drm_drv.h"
+#include "exynos_drm_buf.h"
+
+static DEFINE_MUTEX(exynos_drm_buf_lock);
+
+static int lowlevel_buffer_allocate(struct drm_device *dev,
+		struct exynos_drm_buf_entry *entry)
+{
+	DRM_DEBUG_KMS("%s\n", __FILE__);
+
+	entry->vaddr = dma_alloc_writecombine(dev->dev, entry->size,
+			(dma_addr_t *)&entry->paddr, GFP_KERNEL);
+	if (!entry->paddr) {
+		DRM_ERROR("failed to allocate buffer.\n");
+		return -ENOMEM;
+	}
+
+	DRM_DEBUG_KMS("allocated : vaddr(0x%x), paddr(0x%x), size(0x%x)\n",
+			(unsigned int)entry->vaddr, entry->paddr, entry->size);
+
+	return 0;
+}
+
+static void lowlevel_buffer_deallocate(struct drm_device *dev,
+		struct exynos_drm_buf_entry *entry)
+{
+	DRM_DEBUG_KMS("%s.\n", __FILE__);
+
+	if (entry->paddr && entry->vaddr && entry->size)
+		dma_free_writecombine(dev->dev, entry->size, entry->vaddr,
+				entry->paddr);
+	else
+		DRM_DEBUG_KMS("entry data is null.\n");
+}
+
+struct exynos_drm_buf_entry *exynos_drm_buf_create(struct drm_device *dev,
+		unsigned int size)
+{
+	struct exynos_drm_buf_entry *entry;
+
+	DRM_DEBUG_KMS("%s.\n", __FILE__);
+
+	entry = kzalloc(sizeof(*entry), GFP_KERNEL);
+	if (!entry) {
+		DRM_ERROR("failed to allocate exynos_drm_buf_entry.\n");
+		return ERR_PTR(-ENOMEM);
+	}
+
+	entry->size = size;
+
+	/*
+	 * allocate memory region with size and set the memory information
+	 * to vaddr and paddr of a entry object.
+	 */
+	if (lowlevel_buffer_allocate(dev, entry) < 0) {
+		kfree(entry);
+		entry = NULL;
+		return ERR_PTR(-ENOMEM);
+	}
+
+	return entry;
+}
+
+void exynos_drm_buf_destroy(struct drm_device *dev,
+		struct exynos_drm_buf_entry *entry)
+{
+	DRM_DEBUG_KMS("%s.\n", __FILE__);
+
+	if (!entry) {
+		DRM_DEBUG_KMS("entry is null.\n");
+		return;
+	}
+
+	lowlevel_buffer_deallocate(dev, entry);
+
+	kfree(entry);
+	entry = NULL;
+}
+
+MODULE_AUTHOR("Inki Dae <inki.dae@samsung.com>");
+MODULE_DESCRIPTION("Samsung SoC DRM Buffer Management Module");
+MODULE_LICENSE("GPL");