xref: /openbmc/linux/drivers/gpu/drm/udl/udl_proto.h (revision 1b8db07f)
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