xref: /openbmc/u-boot/drivers/video/ld9040.c (revision 554c983e)
1 /*
2  * ld9040 AMOLED LCD panel driver.
3  *
4  * Copyright (C) 2012 Samsung Electronics
5  * Donghwa Lee <dh09.lee@samsung.com>
6  *
7  * SPDX-License-Identifier:	GPL-2.0+
8  */
9 
10 #include <common.h>
11 #include <spi.h>
12 
13 static const unsigned char SEQ_USER_SETTING[] = {
14 	0xF0, 0x5A, 0x5A
15 };
16 
17 static const unsigned char SEQ_ELVSS_ON[] = {
18 	0xB1, 0x0D, 0x00, 0x16,
19 };
20 
21 static const unsigned char SEQ_GTCON[] = {
22 	0xF7, 0x09, 0x00, 0x00,
23 };
24 
25 static const unsigned char SEQ_PANEL_CONDITION[] = {
26 	0xF8, 0x05, 0x65, 0x96, 0x71, 0x7D, 0x19, 0x3B,
27 	0x0D, 0x19, 0x7E, 0x0D, 0xE2, 0x00, 0x00, 0x7E,
28 	0x7D, 0x07, 0x07, 0x20, 0x20, 0x20, 0x02, 0x02,
29 };
30 
31 static const unsigned char SEQ_GAMMA_SET1[] = {
32 	0xF9, 0x00, 0xA7, 0xB4, 0xAE, 0xBF, 0x00, 0x91,
33 	0x00, 0xB2, 0xB4, 0xAA, 0xBB, 0x00, 0xAC, 0x00,
34 	0xB3, 0xB1, 0xAA, 0xBC, 0x00, 0xB3,
35 };
36 
37 static const unsigned char SEQ_GAMMA_CTRL[] = {
38 	0xFB, 0x02, 0x5A,
39 };
40 
41 static const unsigned char SEQ_DISPCTL[] = {
42 	0xF2, 0x02, 0x08, 0x08, 0x10, 0x10,
43 };
44 
45 static const unsigned char SEQ_MANPWR[] = {
46 	0xB0, 0x04,
47 };
48 
49 static const unsigned char SEQ_PWR_CTRL[] = {
50 	0xF4, 0x0A, 0x87, 0x25, 0x6A, 0x44, 0x02, 0x88,
51 };
52 
53 static const unsigned char SEQ_SLPOUT[] = {
54 	0x11,
55 };
56 
57 static const unsigned char SEQ_DISPON[] = {
58 	0x29,
59 };
60 
61 static const unsigned char SEQ_DISPOFF[] = {
62 	0x28,
63 };
64 
65 static void ld9040_spi_write(const unsigned char *wbuf, unsigned int size_cmd)
66 {
67 	int i = 0;
68 
69 	/*
70 	 * Data are transmitted in 9-bit words:
71 	 * the first bit is command/parameter, the other are the value.
72 	 * The value's LSB is shifted to MSB position, to be sent as 9th bit
73 	 */
74 
75 	unsigned int data_out = 0, data_in = 0;
76 	for (i = 0; i < size_cmd; i++) {
77 		data_out = wbuf[i] >> 1;
78 		if (i != 0)
79 			data_out += 0x0080;
80 		if (wbuf[i] & 0x01)
81 			data_out += 0x8000;
82 		spi_xfer(NULL, 9, &data_out, &data_in, SPI_XFER_BEGIN);
83 	}
84 }
85 
86 void ld9040_cfg_ldo(void)
87 {
88 	udelay(10);
89 
90 	ld9040_spi_write(SEQ_USER_SETTING,
91 					ARRAY_SIZE(SEQ_USER_SETTING));
92 	ld9040_spi_write(SEQ_PANEL_CONDITION,
93 					ARRAY_SIZE(SEQ_PANEL_CONDITION));
94 	ld9040_spi_write(SEQ_DISPCTL, ARRAY_SIZE(SEQ_DISPCTL));
95 	ld9040_spi_write(SEQ_MANPWR, ARRAY_SIZE(SEQ_MANPWR));
96 	ld9040_spi_write(SEQ_PWR_CTRL, ARRAY_SIZE(SEQ_PWR_CTRL));
97 	ld9040_spi_write(SEQ_ELVSS_ON, ARRAY_SIZE(SEQ_ELVSS_ON));
98 	ld9040_spi_write(SEQ_GTCON, ARRAY_SIZE(SEQ_GTCON));
99 	ld9040_spi_write(SEQ_GAMMA_SET1, ARRAY_SIZE(SEQ_GAMMA_SET1));
100 	ld9040_spi_write(SEQ_GAMMA_CTRL, ARRAY_SIZE(SEQ_GAMMA_CTRL));
101 	ld9040_spi_write(SEQ_SLPOUT, ARRAY_SIZE(SEQ_SLPOUT));
102 
103 	udelay(120);
104 }
105 
106 void ld9040_enable_ldo(unsigned int onoff)
107 {
108 	if (onoff)
109 		ld9040_spi_write(SEQ_DISPON, ARRAY_SIZE(SEQ_DISPON));
110 	else
111 		ld9040_spi_write(SEQ_DISPOFF, ARRAY_SIZE(SEQ_DISPOFF));
112 }
113