drm/sun4i: Add a driver for the display frontend

The display frontend is an hardware block that can be used to implement
some more advanced features like hardware scaling or colorspace
conversions. It can also be used to implement the output format of the VPU.

Let's create a minimal driver for it that will only enable the hardware
scaling features.

Reviewed-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Link: https://patchwork.freedesktop.org/patch/msgid/029cdc3478bf89d422f5e8d9e600baf5e48ce4db.1516613040.git-series.maxime.ripard@free-electrons.com

1 files changed, 99 insertions, 0 deletions

diff --git a/drivers/gpu/drm/sun4i/sun4i_frontend.h b/drivers/gpu/drm/sun4i/sun4i_frontend.h
new file mode 100644
index 000000000000..02661ce81f3e
--- /dev/null
+++ b/drivers/gpu/drm/sun4i/sun4i_frontend.h
@@ -0,0 +1,99 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2017 Free Electrons
+ * Maxime Ripard <maxime.ripard@free-electrons.com>
+ */
+
+#ifndef _SUN4I_FRONTEND_H_
+#define _SUN4I_FRONTEND_H_
+
+#include <linux/list.h>
+
+#define SUN4I_FRONTEND_EN_REG                   0x000
+#define SUN4I_FRONTEND_EN_EN                            BIT(0)
+
+#define SUN4I_FRONTEND_FRM_CTRL_REG             0x004
+#define SUN4I_FRONTEND_FRM_CTRL_COEF_ACCESS_CTRL        BIT(23)
+#define SUN4I_FRONTEND_FRM_CTRL_FRM_START               BIT(16)
+#define SUN4I_FRONTEND_FRM_CTRL_COEF_RDY                BIT(1)
+#define SUN4I_FRONTEND_FRM_CTRL_REG_RDY                 BIT(0)
+
+#define SUN4I_FRONTEND_BYPASS_REG               0x008
+#define SUN4I_FRONTEND_BYPASS_CSC_EN                    BIT(1)
+
+#define SUN4I_FRONTEND_BUF_ADDR0_REG            0x020
+
+#define SUN4I_FRONTEND_LINESTRD0_REG            0x040
+
+#define SUN4I_FRONTEND_INPUT_FMT_REG            0x04c
+#define SUN4I_FRONTEND_INPUT_FMT_DATA_MOD(mod)          ((mod) << 8)
+#define SUN4I_FRONTEND_INPUT_FMT_DATA_FMT(fmt)          ((fmt) << 4)
+#define SUN4I_FRONTEND_INPUT_FMT_PS(ps)                 (ps)
+
+#define SUN4I_FRONTEND_OUTPUT_FMT_REG           0x05c
+#define SUN4I_FRONTEND_OUTPUT_FMT_DATA_FMT(fmt)         (fmt)
+
+#define SUN4I_FRONTEND_CH0_INSIZE_REG           0x100
+#define SUN4I_FRONTEND_INSIZE(h, w)                     ((((h) - 1) << 16) | (((w) - 1)))
+
+#define SUN4I_FRONTEND_CH0_OUTSIZE_REG          0x104
+#define SUN4I_FRONTEND_OUTSIZE(h, w)                    ((((h) - 1) << 16) | (((w) - 1)))
+
+#define SUN4I_FRONTEND_CH0_HORZFACT_REG         0x108
+#define SUN4I_FRONTEND_HORZFACT(i, f)                   (((i) << 16) | (f))
+
+#define SUN4I_FRONTEND_CH0_VERTFACT_REG         0x10c
+#define SUN4I_FRONTEND_VERTFACT(i, f)                   (((i) << 16) | (f))
+
+#define SUN4I_FRONTEND_CH0_HORZPHASE_REG        0x110
+#define SUN4I_FRONTEND_CH0_VERTPHASE0_REG       0x114
+#define SUN4I_FRONTEND_CH0_VERTPHASE1_REG       0x118
+
+#define SUN4I_FRONTEND_CH1_INSIZE_REG           0x200
+#define SUN4I_FRONTEND_CH1_OUTSIZE_REG          0x204
+#define SUN4I_FRONTEND_CH1_HORZFACT_REG         0x208
+#define SUN4I_FRONTEND_CH1_VERTFACT_REG         0x20c
+
+#define SUN4I_FRONTEND_CH1_HORZPHASE_REG        0x210
+#define SUN4I_FRONTEND_CH1_VERTPHASE0_REG       0x214
+#define SUN4I_FRONTEND_CH1_VERTPHASE1_REG       0x218
+
+#define SUN4I_FRONTEND_CH0_HORZCOEF0_REG(i)     (0x400 + i * 4)
+#define SUN4I_FRONTEND_CH0_HORZCOEF1_REG(i)     (0x480 + i * 4)
+#define SUN4I_FRONTEND_CH0_VERTCOEF_REG(i)      (0x500 + i * 4)
+#define SUN4I_FRONTEND_CH1_HORZCOEF0_REG(i)     (0x600 + i * 4)
+#define SUN4I_FRONTEND_CH1_HORZCOEF1_REG(i)     (0x680 + i * 4)
+#define SUN4I_FRONTEND_CH1_VERTCOEF_REG(i)      (0x700 + i * 4)
+
+struct clk;
+struct device_node;
+struct drm_plane;
+struct regmap;
+struct reset_control;
+
+struct sun4i_frontend {
+        struct list_head        list;
+        struct device           *dev;
+        struct device_node      *node;
+
+        struct clk              *bus_clk;
+        struct clk              *mod_clk;
+        struct clk              *ram_clk;
+        struct regmap           *regs;
+        struct reset_control    *reset;
+};
+
+extern const struct of_device_id sun4i_frontend_of_table[];
+
+int sun4i_frontend_init(struct sun4i_frontend *frontend);
+void sun4i_frontend_exit(struct sun4i_frontend *frontend);
+int sun4i_frontend_enable(struct sun4i_frontend *frontend);
+
+void sun4i_frontend_update_buffer(struct sun4i_frontend *frontend,
+                                  struct drm_plane *plane);
+void sun4i_frontend_update_coord(struct sun4i_frontend *frontend,
+                                 struct drm_plane *plane);
+int sun4i_frontend_update_formats(struct sun4i_frontend *frontend,
+                                  struct drm_plane *plane, uint32_t out_fmt);
+
+#endif /* _SUN4I_FRONTEND_H_ */