1 files changed, 64 insertions, 0 deletions
diff --git a/board/gdsys/common/ch7301.c b/board/gdsys/common/ch7301.c
new file mode 100644
index 0000000..c054e55
--- /dev/null
+++ b/board/gdsys/common/ch7301.c
@@ -0,0 +1,64 @@
+/*
+ * (C) Copyright 2014
+ * Dirk Eibach,  Guntermann & Drunck GmbH, dirk.eibach@gdsys.cc
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+/* Chrontel CH7301C DVI Transmitter */
+
+#include <common.h>
+#include <asm/io.h>
+#include <errno.h>
+#include <i2c.h>
+
+#define CH7301_I2C_ADDR 0x75
+
+enum {
+	CH7301_CM = 0x1c,		/* Clock Mode Register */
+	CH7301_IC = 0x1d,		/* Input Clock Register */
+	CH7301_GPIO = 0x1e,		/* GPIO Control Register */
+	CH7301_IDF = 0x1f,		/* Input Data Format Register */
+	CH7301_CD = 0x20,		/* Connection Detect Register */
+	CH7301_DC = 0x21,		/* DAC Control Register */
+	CH7301_HPD = 0x23,		/* Hot Plug Detection Register */
+	CH7301_TCTL = 0x31,		/* DVI Control Input Register */
+	CH7301_TPCP = 0x33,		/* DVI PLL Charge Pump Ctrl Register */
+	CH7301_TPD = 0x34,		/* DVI PLL Divide Register */
+	CH7301_TPVT = 0x35,		/* DVI PLL Supply Control Register */
+	CH7301_TPF = 0x36,		/* DVI PLL Filter Register */
+	CH7301_TCT = 0x37,		/* DVI Clock Test Register */
+	CH7301_TSTP = 0x48,		/* Test Pattern Register */
+	CH7301_PM = 0x49,		/* Power Management register */
+	CH7301_VID = 0x4a,		/* Version ID Register */
+	CH7301_DID = 0x4b,		/* Device ID Register */
+	CH7301_DSP = 0x56,		/* DVI Sync polarity Register */
+};
+
+int ch7301_i2c[] = CONFIG_SYS_CH7301_I2C;
+
+int ch7301_probe(unsigned screen, bool power)
+{
+	u8 value;
+
+	i2c_set_bus_num(ch7301_i2c[screen]);
+	if (i2c_probe(CH7301_I2C_ADDR))
+		return -1;
+
+	value = i2c_reg_read(CH7301_I2C_ADDR, CH7301_DID);
+	if (value != 0x17)
+		return -1;
+
+	if (power) {
+		i2c_reg_write(CH7301_I2C_ADDR, CH7301_TPCP, 0x08);
+		i2c_reg_write(CH7301_I2C_ADDR, CH7301_TPD, 0x16);
+		i2c_reg_write(CH7301_I2C_ADDR, CH7301_TPF, 0x60);
+		i2c_reg_write(CH7301_I2C_ADDR, CH7301_DC, 0x09);
+		i2c_reg_write(CH7301_I2C_ADDR, CH7301_PM, 0xc0);
+	} else {
+		i2c_reg_write(CH7301_I2C_ADDR, CH7301_DC, 0x00);
+		i2c_reg_write(CH7301_I2C_ADDR, CH7301_PM, 0x01);
+	}
+
+	return 0;
+}