1 files changed, 78 insertions, 0 deletions

diff --git a/drivers/video/tegra/dc/ext/util.c b/drivers/video/tegra/dc/ext/util.c
new file mode 100644
index 00000000000..747085579f1
--- /dev/null
+++ b/drivers/video/tegra/dc/ext/util.c
@@ -0,0 +1,78 @@
+/*
+ * drivers/video/tegra/dc/ext/util.c
+ *
+ * Copyright (C) 2011, NVIDIA Corporation
+ *
+ * Author: Robert Morell <rmorell@nvidia.com>
+ *
+ * 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.
+ */
+
+#include <linux/err.h>
+#include <linux/types.h>
+
+#include <mach/dc.h>
+#include <mach/nvmap.h>
+
+/* ugh */
+#include "../../nvmap/nvmap.h"
+
+#include "tegra_dc_ext_priv.h"
+
+int tegra_dc_ext_pin_window(struct tegra_dc_ext_user *user, u32 id,
+                            struct nvmap_handle_ref **handle,
+                            dma_addr_t *phys_addr)
+{
+        struct tegra_dc_ext *ext = user->ext;
+        struct nvmap_handle_ref *win_dup;
+        struct nvmap_handle *win_handle;
+        dma_addr_t phys;
+
+        if (!id) {
+                *handle = NULL;
+                *phys_addr = -1;
+
+                return 0;
+        }
+
+        /*
+         * Take a reference to the buffer using the user's nvmap context, to
+         * make sure they have permissions to access it.
+         */
+        win_handle = nvmap_get_handle_id(user->nvmap, id);
+        if (!win_handle)
+                return -EACCES;
+
+        /*
+         * Duplicate the buffer's handle into the dc_ext driver's nvmap
+         * context, to ensure that the handle won't be freed as long as it is
+         * in use by display.
+         */
+        win_dup = nvmap_duplicate_handle_id(ext->nvmap, id);
+
+        /* Release the reference we took in the user's context above */
+        nvmap_handle_put(win_handle);
+
+        if (IS_ERR(win_dup))
+                return PTR_ERR(win_dup);
+
+        phys = nvmap_pin(ext->nvmap, win_dup);
+        /* XXX this isn't correct for non-pointers... */
+        if (IS_ERR((void *)phys)) {
+                nvmap_free(ext->nvmap, win_dup);
+                return PTR_ERR((void *)phys);
+        }
+
+        *phys_addr = phys;
+        *handle = win_dup;
+
+        return 0;
+}