1/* SPDX-License-Identifier: GPL-2.0-only */
2
3#ifndef UDL_PROTO_H
4#define UDL_PROTO_H
5
6#include <linux/bits.h>
7
8#define UDL_MSG_BULK		0xaf
9
10/* Register access */
11#define UDL_CMD_WRITEREG	0x20 /* See register constants below */
12
13/* Framebuffer access */
14#define UDL_CMD_WRITERAW8	0x60 /* 8 bit raw write command. */
15#define UDL_CMD_WRITERL8	0x61 /* 8 bit run length command. */
16#define UDL_CMD_WRITECOPY8	0x62 /* 8 bit copy command. */
17#define UDL_CMD_WRITERLX8	0x63 /* 8 bit extended run length command. */
18#define UDL_CMD_WRITERAW16	0x68 /* 16 bit raw write command. */
19#define UDL_CMD_WRITERL16	0x69 /* 16 bit run length command. */
20#define UDL_CMD_WRITECOPY16	0x6a /* 16 bit copy command. */
21#define UDL_CMD_WRITERLX16	0x6b /* 16 bit extended run length command. */
22
23/* Color depth */
24#define UDL_REG_COLORDEPTH		0x00
25#define UDL_COLORDEPTH_16BPP		0
26#define UDL_COLORDEPTH_24BPP		1
27
28/* Display-mode settings */
29#define UDL_REG_XDISPLAYSTART		0x01
30#define UDL_REG_XDISPLAYEND		0x03
31#define UDL_REG_YDISPLAYSTART		0x05
32#define UDL_REG_YDISPLAYEND		0x07
33#define UDL_REG_XENDCOUNT		0x09
34#define UDL_REG_HSYNCSTART		0x0b
35#define UDL_REG_HSYNCEND		0x0d
36#define UDL_REG_HPIXELS			0x0f
37#define UDL_REG_YENDCOUNT		0x11
38#define UDL_REG_VSYNCSTART		0x13
39#define UDL_REG_VSYNCEND		0x15
40#define UDL_REG_VPIXELS			0x17
41#define UDL_REG_PIXELCLOCK5KHZ		0x1b
42
43/* On/Off for driving the DisplayLink framebuffer to the display */
44#define UDL_REG_BLANKMODE		0x1f
45#define UDL_BLANKMODE_ON		0x00 /* hsync and vsync on, visible */
46#define UDL_BLANKMODE_BLANKED		0x01 /* hsync and vsync on, blanked */
47#define UDL_BLANKMODE_VSYNC_OFF		0x03 /* vsync off, blanked */
48#define UDL_BLANKMODE_HSYNC_OFF		0x05 /* hsync off, blanked */
49#define UDL_BLANKMODE_POWERDOWN		0x07 /* powered off; requires modeset */
50
51/* Framebuffer address */
52#define UDL_REG_BASE16BPP_ADDR2		0x20
53#define UDL_REG_BASE16BPP_ADDR1		0x21
54#define UDL_REG_BASE16BPP_ADDR0		0x22
55#define UDL_REG_BASE8BPP_ADDR2		0x26
56#define UDL_REG_BASE8BPP_ADDR1		0x27
57#define UDL_REG_BASE8BPP_ADDR0		0x28
58
59#define UDL_BASE_ADDR0_MASK		GENMASK(7, 0)
60#define UDL_BASE_ADDR1_MASK		GENMASK(15, 8)
61#define UDL_BASE_ADDR2_MASK		GENMASK(23, 16)
62
63/* Lock/unlock video registers */
64#define UDL_REG_VIDREG			0xff
65#define UDL_VIDREG_LOCK			0x00
66#define UDL_VIDREG_UNLOCK		0xff
67
68#endif
69