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 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