omapfb: copy omapdss & displays for omapfb

This patch makes a copy of the omapdss driver and the omap panel &
encoder drivers for omapfb. The purpose is to separate omapdrm and
omapfb drivers from each other.

Note that this patch only does a direct copy of the files without any
other modifications. The files are not yet used.

The original files are in:

drivers/video/fbdev/omap2/dss/
drivers/video/fbdev/omap2/displays-new/

Here's a more detailed explanation about this and the following patches,
from the introduction mail of the patch series:

A short background on the current status. We have the following
entities:

* omapdss, located in drivers/video/fbdev/omap2/dss/. This is a driver for the
  display subsystem IPs used on OMAP (and related) SoCs. It offers only a
  kernel internal API, and does not implement anything for fbdev or drm.

* omapdss panels and encoders, located in
  drivers/video/fbdev/omap2/displays-new/. These are panel and external encoder
  drivers, which use APIs offered by omapdss driver. These also don't implement
  anything for fbdev or drm.

* omapdrm, located in drivers/gpu/drm/omapdrm/. This is a drm driver, which
  uses omapdss and the panel/encoder drivers to operate the hardware.

* omapfb, located in drivers/video/fbdev/omap2/omapfb/. This is an fbdev
  driver, which uses omapdss and the panel/encoder drivers to operate the
  hardware.

* omap_vout, located in drivers/media/platform/omap/. This is a v4l2 driver,
  which uses omapdss and omapfb to implement a v4l2 API for the video overlays.

So, on the top level, we have either omapdrm, or omapfb+omap_vout. Both of
those use the same low level drivers. Without going to the historical details
why the architecture is like that, I think it's finally time to change that.

The situation with omapfb+omap_vout is that it still works, but no new features
have been added for a long time, and I want to keep it working as it's still
being used.  At some point in the future I'd like to remove omapfb and
omap_vout altogether.

Omapdrm, on the other hand, is being actively developed. Sharing the low level
parts with omapfb makes that development more difficult than it should be. It
also "hides" half of the development, as everything happening in the low level
parts resides under fbdev directory, not in the drm directory.

I've been wanting to clean this up for a long time, but I haven't figured out a
very good way to do it. I still haven't, but here's the best way I have come up
with.

This series makes a full copy of the low level parts, omapdss and panel/encoder
drivers. Both omapfb+omap_vout and omapdrm will have their own versions. The
copy omapfb+omap_vout get is a new copy, and the copy that omapdrm gets is just
the current files moved. This way git will associate the omapdrm version with
the old files.

The omapfb+omap_vout versions won't be touched unless there are some big issues
there.

The omapdrm versions can be refactored and cleaned up, as the omapfb support
code is no longer needed. We can perhaps also merge omapdss and omapdrm into
the same kernel module.

This series only does the copy, and the absolutely necessary parts. No further
cleanups are done yet.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Acked-by: Dave Airlie <airlied@gmail.com>
Acked-by: Rob Clark <robdclark@gmail.com>

1 files changed, 202 insertions, 0 deletions

diff --git a/drivers/video/fbdev/omap2/omapfb/dss/overlay.c b/drivers/video/fbdev/omap2/omapfb/dss/overlay.c
new file mode 100644
index 000000000000..2f7cee985cdd
--- /dev/null
+++ b/drivers/video/fbdev/omap2/omapfb/dss/overlay.c
@@ -0,0 +1,202 @@
+/*
+ * linux/drivers/video/omap2/dss/overlay.c
+ *
+ * Copyright (C) 2009 Nokia Corporation
+ * Author: Tomi Valkeinen <tomi.valkeinen@nokia.com>
+ *
+ * Some code and ideas taken from drivers/video/omap/ driver
+ * by Imre Deak.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * 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/>.
+ */
+
+#define DSS_SUBSYS_NAME "OVERLAY"
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/sysfs.h>
+#include <linux/platform_device.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+
+#include <video/omapdss.h>
+
+#include "dss.h"
+#include "dss_features.h"
+
+static int num_overlays;
+static struct omap_overlay *overlays;
+
+int omap_dss_get_num_overlays(void)
+{
+	return num_overlays;
+}
+EXPORT_SYMBOL(omap_dss_get_num_overlays);
+
+struct omap_overlay *omap_dss_get_overlay(int num)
+{
+	if (num >= num_overlays)
+		return NULL;
+
+	return &overlays[num];
+}
+EXPORT_SYMBOL(omap_dss_get_overlay);
+
+void dss_init_overlays(struct platform_device *pdev)
+{
+	int i, r;
+
+	num_overlays = dss_feat_get_num_ovls();
+
+	overlays = kzalloc(sizeof(struct omap_overlay) * num_overlays,
+			GFP_KERNEL);
+
+	BUG_ON(overlays == NULL);
+
+	for (i = 0; i < num_overlays; ++i) {
+		struct omap_overlay *ovl = &overlays[i];
+
+		switch (i) {
+		case 0:
+			ovl->name = "gfx";
+			ovl->id = OMAP_DSS_GFX;
+			break;
+		case 1:
+			ovl->name = "vid1";
+			ovl->id = OMAP_DSS_VIDEO1;
+			break;
+		case 2:
+			ovl->name = "vid2";
+			ovl->id = OMAP_DSS_VIDEO2;
+			break;
+		case 3:
+			ovl->name = "vid3";
+			ovl->id = OMAP_DSS_VIDEO3;
+			break;
+		}
+
+		ovl->caps = dss_feat_get_overlay_caps(ovl->id);
+		ovl->supported_modes =
+			dss_feat_get_supported_color_modes(ovl->id);
+
+		r = dss_overlay_kobj_init(ovl, pdev);
+		if (r)
+			DSSERR("failed to create sysfs file\n");
+	}
+}
+
+void dss_uninit_overlays(struct platform_device *pdev)
+{
+	int i;
+
+	for (i = 0; i < num_overlays; ++i) {
+		struct omap_overlay *ovl = &overlays[i];
+		dss_overlay_kobj_uninit(ovl);
+	}
+
+	kfree(overlays);
+	overlays = NULL;
+	num_overlays = 0;
+}
+
+int dss_ovl_simple_check(struct omap_overlay *ovl,
+		const struct omap_overlay_info *info)
+{
+	if ((ovl->caps & OMAP_DSS_OVL_CAP_SCALE) == 0) {
+		if (info->out_width != 0 && info->width != info->out_width) {
+			DSSERR("check_overlay: overlay %d doesn't support "
+					"scaling\n", ovl->id);
+			return -EINVAL;
+		}
+
+		if (info->out_height != 0 && info->height != info->out_height) {
+			DSSERR("check_overlay: overlay %d doesn't support "
+					"scaling\n", ovl->id);
+			return -EINVAL;
+		}
+	}
+
+	if ((ovl->supported_modes & info->color_mode) == 0) {
+		DSSERR("check_overlay: overlay %d doesn't support mode %d\n",
+				ovl->id, info->color_mode);
+		return -EINVAL;
+	}
+
+	if (info->zorder >= omap_dss_get_num_overlays()) {
+		DSSERR("check_overlay: zorder %d too high\n", info->zorder);
+		return -EINVAL;
+	}
+
+	if (dss_feat_rotation_type_supported(info->rotation_type) == 0) {
+		DSSERR("check_overlay: rotation type %d not supported\n",
+				info->rotation_type);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+int dss_ovl_check(struct omap_overlay *ovl, struct omap_overlay_info *info,
+		const struct omap_video_timings *mgr_timings)
+{
+	u16 outw, outh;
+	u16 dw, dh;
+
+	dw = mgr_timings->x_res;
+	dh = mgr_timings->y_res;
+
+	if ((ovl->caps & OMAP_DSS_OVL_CAP_SCALE) == 0) {
+		outw = info->width;
+		outh = info->height;
+	} else {
+		if (info->out_width == 0)
+			outw = info->width;
+		else
+			outw = info->out_width;
+
+		if (info->out_height == 0)
+			outh = info->height;
+		else
+			outh = info->out_height;
+	}
+
+	if (dw < info->pos_x + outw) {
+		DSSERR("overlay %d horizontally not inside the display area "
+				"(%d + %d >= %d)\n",
+				ovl->id, info->pos_x, outw, dw);
+		return -EINVAL;
+	}
+
+	if (dh < info->pos_y + outh) {
+		DSSERR("overlay %d vertically not inside the display area "
+				"(%d + %d >= %d)\n",
+				ovl->id, info->pos_y, outh, dh);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+/*
+ * Checks if replication logic should be used. Only use when overlay is in
+ * RGB12U or RGB16 mode, and video port width interface is 18bpp or 24bpp
+ */
+bool dss_ovl_use_replication(struct dss_lcd_mgr_config config,
+		enum omap_color_mode mode)
+{
+	if (mode != OMAP_DSS_COLOR_RGB12U && mode != OMAP_DSS_COLOR_RGB16)
+		return false;
+
+	return config.video_port_width > 16;
+}