1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * (C) Copyright 2014
4 * Dirk Eibach, Guntermann & Drunck GmbH, dirk.eibach@gdsys.cc
5 */
6
7 /* Chrontel CH7301C DVI Transmitter */
8
9 #include <common.h>
10 #include <asm/io.h>
11 #include <errno.h>
12 #include <i2c.h>
13
14 #define CH7301_I2C_ADDR 0x75
15
16 enum {
17 CH7301_CM = 0x1c, /* Clock Mode Register */
18 CH7301_IC = 0x1d, /* Input Clock Register */
19 CH7301_GPIO = 0x1e, /* GPIO Control Register */
20 CH7301_IDF = 0x1f, /* Input Data Format Register */
21 CH7301_CD = 0x20, /* Connection Detect Register */
22 CH7301_DC = 0x21, /* DAC Control Register */
23 CH7301_HPD = 0x23, /* Hot Plug Detection Register */
24 CH7301_TCTL = 0x31, /* DVI Control Input Register */
25 CH7301_TPCP = 0x33, /* DVI PLL Charge Pump Ctrl Register */
26 CH7301_TPD = 0x34, /* DVI PLL Divide Register */
27 CH7301_TPVT = 0x35, /* DVI PLL Supply Control Register */
28 CH7301_TPF = 0x36, /* DVI PLL Filter Register */
29 CH7301_TCT = 0x37, /* DVI Clock Test Register */
30 CH7301_TSTP = 0x48, /* Test Pattern Register */
31 CH7301_PM = 0x49, /* Power Management register */
32 CH7301_VID = 0x4a, /* Version ID Register */
33 CH7301_DID = 0x4b, /* Device ID Register */
34 CH7301_DSP = 0x56, /* DVI Sync polarity Register */
35 };
36
37 int ch7301_i2c[] = CONFIG_SYS_CH7301_I2C;
38
ch7301_probe(unsigned screen,bool power)39 int ch7301_probe(unsigned screen, bool power)
40 {
41 u8 value;
42
43 i2c_set_bus_num(ch7301_i2c[screen]);
44 if (i2c_probe(CH7301_I2C_ADDR))
45 return -1;
46
47 value = i2c_reg_read(CH7301_I2C_ADDR, CH7301_DID);
48 if (value != 0x17)
49 return -1;
50
51 if (power) {
52 i2c_reg_write(CH7301_I2C_ADDR, CH7301_TPCP, 0x08);
53 i2c_reg_write(CH7301_I2C_ADDR, CH7301_TPD, 0x16);
54 i2c_reg_write(CH7301_I2C_ADDR, CH7301_TPF, 0x60);
55 i2c_reg_write(CH7301_I2C_ADDR, CH7301_DC, 0x09);
56 i2c_reg_write(CH7301_I2C_ADDR, CH7301_PM, 0xc0);
57 } else {
58 i2c_reg_write(CH7301_I2C_ADDR, CH7301_DC, 0x00);
59 i2c_reg_write(CH7301_I2C_ADDR, CH7301_PM, 0x01);
60 }
61
62 return 0;
63 }
64