board/gdsys/common/ch7301.c

   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 }