drm: Add Allwinner A10 Display Engine support

The Allwinner A10 and subsequent SoCs share the same display pipeline, with
variations in the number of controllers (1 or 2), or the presence or not of
some output (HDMI, TV, VGA) or not.

Add a driver with a limited set of features for now, and we will hopefully
support all of them eventually

Reviewed-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

1 files changed, 54 insertions, 0 deletions

diff --git a/drivers/gpu/drm/sun4i/sun4i_framebuffer.c b/drivers/gpu/drm/sun4i/sun4i_framebuffer.c
new file mode 100644
index 000000000000..a0b30c216a5b
--- /dev/null
+++ b/drivers/gpu/drm/sun4i/sun4i_framebuffer.c
@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2015 Free Electrons
+ * Copyright (C) 2015 NextThing Co
+ *
+ * Maxime Ripard <maxime.ripard@free-electrons.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.
+ */
+
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_fb_cma_helper.h>
+#include <drm/drmP.h>
+
+#include "sun4i_drv.h"
+
+static void sun4i_de_output_poll_changed(struct drm_device *drm)
+{
+	struct sun4i_drv *drv = drm->dev_private;
+
+	if (drv->fbdev)
+		drm_fbdev_cma_hotplug_event(drv->fbdev);
+}
+
+static const struct drm_mode_config_funcs sun4i_de_mode_config_funcs = {
+	.output_poll_changed	= sun4i_de_output_poll_changed,
+	.atomic_check		= drm_atomic_helper_check,
+	.atomic_commit		= drm_atomic_helper_commit,
+	.fb_create		= drm_fb_cma_create,
+};
+
+struct drm_fbdev_cma *sun4i_framebuffer_init(struct drm_device *drm)
+{
+	drm_mode_config_reset(drm);
+
+	drm->mode_config.max_width = 8192;
+	drm->mode_config.max_height = 8192;
+
+	drm->mode_config.funcs = &sun4i_de_mode_config_funcs;
+
+	return drm_fbdev_cma_init(drm, 32,
+				  drm->mode_config.num_crtc,
+				  drm->mode_config.num_connector);
+}
+
+void sun4i_framebuffer_free(struct drm_device *drm)
+{
+	struct sun4i_drv *drv = drm->dev_private;
+
+	drm_fbdev_cma_fini(drv->fbdev);
+	drm_mode_config_cleanup(drm);
+}