drm/sun4i: add support for Allwinner DE2 mixers

Allwinner have a new "Display Engine 2.0" in their new SoCs, which comes
with mixers to do graphic processing and feed data to TCON, like the old
backends and frontends.

Add support for the mixer on Allwinner V3s SoC; it's the simplest one.

Currently a lot of functions are still missing -- more investigations
are needed to gain enough information for them.

Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

1 files changed, 137 insertions, 0 deletions

diff --git a/drivers/gpu/drm/sun4i/sun8i_mixer.h b/drivers/gpu/drm/sun4i/sun8i_mixer.h
new file mode 100644
index 000000000000..4785ac090b8c
--- /dev/null
+++ b/drivers/gpu/drm/sun4i/sun8i_mixer.h
@@ -0,0 +1,137 @@
+/*
+ * Copyright (C) 2017 Icenowy Zheng <icenowy@aosc.io>
+ *
+ * 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.
+ */
+
+#ifndef _SUN8I_MIXER_H_
+#define _SUN8I_MIXER_H_
+
+#include <linux/clk.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+
+#include "sunxi_engine.h"
+
+#define SUN8I_MIXER_MAX_CHAN_COUNT		4
+
+#define SUN8I_MIXER_SIZE(w, h)			(((h) - 1) << 16 | ((w) - 1))
+#define SUN8I_MIXER_COORD(x, y)			((y) << 16 | (x))
+
+#define SUN8I_MIXER_GLOBAL_CTL			0x0
+#define SUN8I_MIXER_GLOBAL_STATUS		0x4
+#define SUN8I_MIXER_GLOBAL_DBUFF		0x8
+#define SUN8I_MIXER_GLOBAL_SIZE			0xc
+
+#define SUN8I_MIXER_GLOBAL_CTL_RT_EN		0x1
+
+#define SUN8I_MIXER_GLOBAL_DBUFF_ENABLE		0x1
+
+#define SUN8I_MIXER_BLEND_FCOLOR_CTL		0x1000
+#define SUN8I_MIXER_BLEND_ATTR_FCOLOR(x)	(0x1004 + 0x10 * (x) + 0x0)
+#define SUN8I_MIXER_BLEND_ATTR_INSIZE(x)	(0x1004 + 0x10 * (x) + 0x4)
+#define SUN8I_MIXER_BLEND_ATTR_OFFSET(x)	(0x1004 + 0x10 * (x) + 0x8)
+#define SUN8I_MIXER_BLEND_ROUTE			0x1080
+#define SUN8I_MIXER_BLEND_PREMULTIPLY		0x1084
+#define SUN8I_MIXER_BLEND_BKCOLOR		0x1088
+#define SUN8I_MIXER_BLEND_OUTSIZE		0x108c
+#define SUN8I_MIXER_BLEND_MODE(x)		(0x1090 + 0x04 * (x))
+#define SUN8I_MIXER_BLEND_CK_CTL		0x10b0
+#define SUN8I_MIXER_BLEND_CK_CFG		0x10b4
+#define SUN8I_MIXER_BLEND_CK_MAX(x)		(0x10c0 + 0x04 * (x))
+#define SUN8I_MIXER_BLEND_CK_MIN(x)		(0x10e0 + 0x04 * (x))
+#define SUN8I_MIXER_BLEND_OUTCTL		0x10fc
+
+/* The following numbers are some still unknown magic numbers */
+#define SUN8I_MIXER_BLEND_ATTR_FCOLOR_DEF	0xff000000
+#define SUN8I_MIXER_BLEND_FCOLOR_CTL_DEF	0x00000101
+#define SUN8I_MIXER_BLEND_PREMULTIPLY_DEF	0x0
+#define SUN8I_MIXER_BLEND_BKCOLOR_DEF		0xff000000
+#define SUN8I_MIXER_BLEND_MODE_DEF		0x03010301
+#define SUN8I_MIXER_BLEND_CK_CTL_DEF		0x0
+
+#define SUN8I_MIXER_BLEND_OUTCTL_INTERLACED	BIT(1)
+
+/*
+ * VI channels are not used now, but the support of them may be introduced in
+ * the future.
+ */
+
+#define SUN8I_MIXER_CHAN_UI_LAYER_ATTR(ch, layer) \
+			(0x2000 + 0x1000 * (ch) + 0x20 * (layer) + 0x0)
+#define SUN8I_MIXER_CHAN_UI_LAYER_SIZE(ch, layer) \
+			(0x2000 + 0x1000 * (ch) + 0x20 * (layer) + 0x4)
+#define SUN8I_MIXER_CHAN_UI_LAYER_COORD(ch, layer) \
+			(0x2000 + 0x1000 * (ch) + 0x20 * (layer) + 0x8)
+#define SUN8I_MIXER_CHAN_UI_LAYER_PITCH(ch, layer) \
+			(0x2000 + 0x1000 * (ch) + 0x20 * (layer) + 0xc)
+#define SUN8I_MIXER_CHAN_UI_LAYER_TOP_LADDR(ch, layer) \
+			(0x2000 + 0x1000 * (ch) + 0x20 * (layer) + 0x10)
+#define SUN8I_MIXER_CHAN_UI_LAYER_BOT_LADDR(ch, layer) \
+			(0x2000 + 0x1000 * (ch) + 0x20 * (layer) + 0x14)
+#define SUN8I_MIXER_CHAN_UI_LAYER_FCOLOR(ch, layer) \
+			(0x2000 + 0x1000 * (ch) + 0x20 * (layer) + 0x18)
+#define SUN8I_MIXER_CHAN_UI_TOP_HADDR(ch)	(0x2000 + 0x1000 * (ch) + 0x80)
+#define SUN8I_MIXER_CHAN_UI_BOT_HADDR(ch)	(0x2000 + 0x1000 * (ch) + 0x84)
+#define SUN8I_MIXER_CHAN_UI_OVL_SIZE(ch)	(0x2000 + 0x1000 * (ch) + 0x88)
+
+#define SUN8I_MIXER_CHAN_UI_LAYER_ATTR_EN		BIT(0)
+#define SUN8I_MIXER_CHAN_UI_LAYER_ATTR_ALPHA_MODE_MASK	GENMASK(2, 1)
+#define SUN8I_MIXER_CHAN_UI_LAYER_ATTR_FBFMT_MASK	GENMASK(11, 8)
+#define SUN8I_MIXER_CHAN_UI_LAYER_ATTR_ALPHA_MASK	GENMASK(31, 24)
+#define SUN8I_MIXER_CHAN_UI_LAYER_ATTR_ALPHA_MODE_DEF	(1 << 1)
+#define SUN8I_MIXER_CHAN_UI_LAYER_ATTR_FBFMT_ARGB8888	(0 << 8)
+#define SUN8I_MIXER_CHAN_UI_LAYER_ATTR_FBFMT_XRGB8888	(4 << 8)
+#define SUN8I_MIXER_CHAN_UI_LAYER_ATTR_FBFMT_RGB888	(8 << 8)
+#define SUN8I_MIXER_CHAN_UI_LAYER_ATTR_ALPHA_DEF	(0xff << 24)
+
+/*
+ * These sub-engines are still unknown now, the EN registers are here only to
+ * be used to disable these sub-engines.
+ */
+#define SUN8I_MIXER_VSU_EN			0x20000
+#define SUN8I_MIXER_GSU1_EN			0x30000
+#define SUN8I_MIXER_GSU2_EN			0x40000
+#define SUN8I_MIXER_GSU3_EN			0x50000
+#define SUN8I_MIXER_FCE_EN			0xa0000
+#define SUN8I_MIXER_BWS_EN			0xa2000
+#define SUN8I_MIXER_LTI_EN			0xa4000
+#define SUN8I_MIXER_PEAK_EN			0xa6000
+#define SUN8I_MIXER_ASE_EN			0xa8000
+#define SUN8I_MIXER_FCC_EN			0xaa000
+#define SUN8I_MIXER_DCSC_EN			0xb0000
+
+struct sun8i_mixer_cfg {
+	int		vi_num;
+	int		ui_num;
+};
+
+struct sun8i_mixer {
+	struct sunxi_engine		engine;
+
+	const struct sun8i_mixer_cfg	*cfg;
+
+	struct reset_control		*reset;
+
+	struct clk			*bus_clk;
+	struct clk			*mod_clk;
+};
+
+static inline struct sun8i_mixer *
+engine_to_sun8i_mixer(struct sunxi_engine *engine)
+{
+	return container_of(engine, struct sun8i_mixer, engine);
+}
+
+void sun8i_mixer_layer_enable(struct sun8i_mixer *mixer,
+				int layer, bool enable);
+int sun8i_mixer_update_layer_coord(struct sun8i_mixer *mixer,
+				     int layer, struct drm_plane *plane);
+int sun8i_mixer_update_layer_formats(struct sun8i_mixer *mixer,
+				       int layer, struct drm_plane *plane);
+int sun8i_mixer_update_layer_buffer(struct sun8i_mixer *mixer,
+				      int layer, struct drm_plane *plane);
+#endif /* _SUN8I_MIXER_H_ */