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, 165 insertions, 0 deletions

diff --git a/drivers/gpu/drm/sun4i/sun4i_backend.h b/drivers/gpu/drm/sun4i/sun4i_backend.h
new file mode 100644
index 000000000000..7070bb3434e5
--- /dev/null
+++ b/drivers/gpu/drm/sun4i/sun4i_backend.h
@@ -0,0 +1,165 @@
+/*
+ * 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.
+ */
+
+#ifndef _SUN4I_BACKEND_H_
+#define _SUN4I_BACKEND_H_
+
+#include <linux/clk.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+
+#define SUN4I_BACKEND_MODCTL_REG		0x800
+#define SUN4I_BACKEND_MODCTL_LINE_SEL			BIT(29)
+#define SUN4I_BACKEND_MODCTL_ITLMOD_EN			BIT(28)
+#define SUN4I_BACKEND_MODCTL_OUT_SEL			GENMASK(22, 20)
+#define SUN4I_BACKEND_MODCTL_OUT_LCD				(0 << 20)
+#define SUN4I_BACKEND_MODCTL_OUT_FE0				(6 << 20)
+#define SUN4I_BACKEND_MODCTL_OUT_FE1				(7 << 20)
+#define SUN4I_BACKEND_MODCTL_HWC_EN			BIT(16)
+#define SUN4I_BACKEND_MODCTL_LAY_EN(l)			BIT(8 + l)
+#define SUN4I_BACKEND_MODCTL_OCSC_EN			BIT(5)
+#define SUN4I_BACKEND_MODCTL_DFLK_EN			BIT(4)
+#define SUN4I_BACKEND_MODCTL_DLP_START_CTL		BIT(2)
+#define SUN4I_BACKEND_MODCTL_START_CTL			BIT(1)
+#define SUN4I_BACKEND_MODCTL_DEBE_EN			BIT(0)
+
+#define SUN4I_BACKEND_BACKCOLOR_REG		0x804
+#define SUN4I_BACKEND_BACKCOLOR(r, g, b)		(((r) << 16) | ((g) << 8) | (b))
+
+#define SUN4I_BACKEND_DISSIZE_REG		0x808
+#define SUN4I_BACKEND_DISSIZE(w, h)			(((((h) - 1) & 0xffff) << 16) | \
+							 (((w) - 1) & 0xffff))
+
+#define SUN4I_BACKEND_LAYSIZE_REG(l)		(0x810 + (0x4 * (l)))
+#define SUN4I_BACKEND_LAYSIZE(w, h)			(((((h) - 1) & 0x1fff) << 16) | \
+							 (((w) - 1) & 0x1fff))
+
+#define SUN4I_BACKEND_LAYCOOR_REG(l)		(0x820 + (0x4 * (l)))
+#define SUN4I_BACKEND_LAYCOOR(x, y)			((((u32)(y) & 0xffff) << 16) | \
+							 ((u32)(x) & 0xffff))
+
+#define SUN4I_BACKEND_LAYLINEWIDTH_REG(l)	(0x840 + (0x4 * (l)))
+
+#define SUN4I_BACKEND_LAYFB_L32ADD_REG(l)	(0x850 + (0x4 * (l)))
+
+#define SUN4I_BACKEND_LAYFB_H4ADD_REG		0x860
+#define SUN4I_BACKEND_LAYFB_H4ADD_MSK(l)		GENMASK(3 + ((l) * 8), 0)
+#define SUN4I_BACKEND_LAYFB_H4ADD(l, val)			((val) << ((l) * 8))
+
+#define SUN4I_BACKEND_REGBUFFCTL_REG		0x870
+#define SUN4I_BACKEND_REGBUFFCTL_AUTOLOAD_DIS		BIT(1)
+#define SUN4I_BACKEND_REGBUFFCTL_LOADCTL		BIT(0)
+
+#define SUN4I_BACKEND_CKMAX_REG			0x880
+#define SUN4I_BACKEND_CKMIN_REG			0x884
+#define SUN4I_BACKEND_CKCFG_REG			0x888
+#define SUN4I_BACKEND_ATTCTL_REG0(l)		(0x890 + (0x4 * (l)))
+#define SUN4I_BACKEND_ATTCTL_REG0_LAY_PIPESEL_MASK	BIT(15)
+#define SUN4I_BACKEND_ATTCTL_REG0_LAY_PIPESEL(x)		((x) << 15)
+#define SUN4I_BACKEND_ATTCTL_REG0_LAY_PRISEL_MASK	GENMASK(11, 10)
+#define SUN4I_BACKEND_ATTCTL_REG0_LAY_PRISEL(x)			((x) << 10)
+
+#define SUN4I_BACKEND_ATTCTL_REG1(l)		(0x8a0 + (0x4 * (l)))
+#define SUN4I_BACKEND_ATTCTL_REG1_LAY_HSCAFCT		GENMASK(15, 14)
+#define SUN4I_BACKEND_ATTCTL_REG1_LAY_WSCAFCT		GENMASK(13, 12)
+#define SUN4I_BACKEND_ATTCTL_REG1_LAY_FBFMT		GENMASK(11, 8)
+#define SUN4I_BACKEND_LAY_FBFMT_1BPP				(0 << 8)
+#define SUN4I_BACKEND_LAY_FBFMT_2BPP				(1 << 8)
+#define SUN4I_BACKEND_LAY_FBFMT_4BPP				(2 << 8)
+#define SUN4I_BACKEND_LAY_FBFMT_8BPP				(3 << 8)
+#define SUN4I_BACKEND_LAY_FBFMT_RGB655				(4 << 8)
+#define SUN4I_BACKEND_LAY_FBFMT_RGB565				(5 << 8)
+#define SUN4I_BACKEND_LAY_FBFMT_RGB556				(6 << 8)
+#define SUN4I_BACKEND_LAY_FBFMT_ARGB1555			(7 << 8)
+#define SUN4I_BACKEND_LAY_FBFMT_RGBA5551			(8 << 8)
+#define SUN4I_BACKEND_LAY_FBFMT_XRGB8888			(9 << 8)
+#define SUN4I_BACKEND_LAY_FBFMT_ARGB8888			(10 << 8)
+#define SUN4I_BACKEND_LAY_FBFMT_RGB888				(11 << 8)
+#define SUN4I_BACKEND_LAY_FBFMT_ARGB4444			(12 << 8)
+#define SUN4I_BACKEND_LAY_FBFMT_RGBA4444			(13 << 8)
+
+#define SUN4I_BACKEND_DLCDPCTL_REG		0x8b0
+#define SUN4I_BACKEND_DLCDPFRMBUF_ADDRCTL_REG	0x8b4
+#define SUN4I_BACKEND_DLCDPCOOR_REG0		0x8b8
+#define SUN4I_BACKEND_DLCDPCOOR_REG1		0x8bc
+
+#define SUN4I_BACKEND_INT_EN_REG		0x8c0
+#define SUN4I_BACKEND_INT_FLAG_REG		0x8c4
+#define SUN4I_BACKEND_REG_LOAD_FINISHED			BIT(1)
+
+#define SUN4I_BACKEND_HWCCTL_REG		0x8d8
+#define SUN4I_BACKEND_HWCFBCTL_REG		0x8e0
+#define SUN4I_BACKEND_WBCTL_REG			0x8f0
+#define SUN4I_BACKEND_WBADD_REG			0x8f4
+#define SUN4I_BACKEND_WBLINEWIDTH_REG		0x8f8
+#define SUN4I_BACKEND_SPREN_REG			0x900
+#define SUN4I_BACKEND_SPRFMTCTL_REG		0x908
+#define SUN4I_BACKEND_SPRALPHACTL_REG		0x90c
+#define SUN4I_BACKEND_IYUVCTL_REG		0x920
+#define SUN4I_BACKEND_IYUVADD_REG(c)		(0x930 + (0x4 * (c)))
+#define SUN4I_BACKEND_IYUVLINEWITDTH_REG(c)	(0x940 + (0x4 * (c)))
+#define SUN4I_BACKEND_YGCOEF_REG(c)		(0x950 + (0x4 * (c)))
+#define SUN4I_BACKEND_YGCONS_REG		0x95c
+#define SUN4I_BACKEND_URCOEF_REG(c)		(0x960 + (0x4 * (c)))
+#define SUN4I_BACKEND_URCONS_REG		0x96c
+#define SUN4I_BACKEND_VBCOEF_REG(c)		(0x970 + (0x4 * (c)))
+#define SUN4I_BACKEND_VBCONS_REG		0x97c
+#define SUN4I_BACKEND_KSCTL_REG			0x980
+#define SUN4I_BACKEND_KSBKCOLOR_REG		0x984
+#define SUN4I_BACKEND_KSFSTLINEWIDTH_REG	0x988
+#define SUN4I_BACKEND_KSVSCAFCT_REG		0x98c
+#define SUN4I_BACKEND_KSHSCACOEF_REG(x)		(0x9a0 + (0x4 * (x)))
+#define SUN4I_BACKEND_OCCTL_REG			0x9c0
+#define SUN4I_BACKEND_OCCTL_ENABLE			BIT(0)
+
+#define SUN4I_BACKEND_OCRCOEF_REG(x)		(0x9d0 + (0x4 * (x)))
+#define SUN4I_BACKEND_OCRCONS_REG		0x9dc
+#define SUN4I_BACKEND_OCGCOEF_REG(x)		(0x9e0 + (0x4 * (x)))
+#define SUN4I_BACKEND_OCGCONS_REG		0x9ec
+#define SUN4I_BACKEND_OCBCOEF_REG(x)		(0x9f0 + (0x4 * (x)))
+#define SUN4I_BACKEND_OCBCONS_REG		0x9fc
+#define SUN4I_BACKEND_SPRCOORCTL_REG(s)		(0xa00 + (0x4 * (s)))
+#define SUN4I_BACKEND_SPRATTCTL_REG(s)		(0xb00 + (0x4 * (s)))
+#define SUN4I_BACKEND_SPRADD_REG(s)		(0xc00 + (0x4 * (s)))
+#define SUN4I_BACKEND_SPRLINEWIDTH_REG(s)	(0xd00 + (0x4 * (s)))
+
+#define SUN4I_BACKEND_SPRPALTAB_OFF		0x4000
+#define SUN4I_BACKEND_GAMMATAB_OFF		0x4400
+#define SUN4I_BACKEND_HWCPATTERN_OFF		0x4800
+#define SUN4I_BACKEND_HWCCOLORTAB_OFF		0x4c00
+#define SUN4I_BACKEND_PIPE_OFF(p)		(0x5000 + (0x400 * (p)))
+
+struct sun4i_backend {
+	struct regmap		*regs;
+
+	struct reset_control	*reset;
+
+	struct clk		*bus_clk;
+	struct clk		*mod_clk;
+	struct clk		*ram_clk;
+};
+
+void sun4i_backend_apply_color_correction(struct sun4i_backend *backend);
+void sun4i_backend_disable_color_correction(struct sun4i_backend *backend);
+
+void sun4i_backend_commit(struct sun4i_backend *backend);
+
+void sun4i_backend_layer_enable(struct sun4i_backend *backend,
+				int layer, bool enable);
+int sun4i_backend_update_layer_coord(struct sun4i_backend *backend,
+				     int layer, struct drm_plane *plane);
+int sun4i_backend_update_layer_formats(struct sun4i_backend *backend,
+				       int layer, struct drm_plane *plane);
+int sun4i_backend_update_layer_buffer(struct sun4i_backend *backend,
+				      int layer, struct drm_plane *plane);
+
+#endif /* _SUN4I_BACKEND_H_ */