Add a driver for the parade ps8640

BRANCH=none
BUG=none
TEST=none

Change-Id: Icf397ce2ffdaed5048367daf2086c067984fea0a
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: b5a88793ccfc46af196300791a300be67b70f5b1
Original-Change-Id: I75adf2688c9c8b9a2338f7dee5d0ac10e7181529
Original-Signed-off-by: Jitao Shi <jitao.shi@mediatek.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/321056
Original-Commit-Ready: Yidi Lin <yidi.lin@mediatek.com>
Original-Tested-by: Yidi Lin <yidi.lin@mediatek.com>
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/13981
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/drivers/parade/Kconfig

@@ -14,3 +14,4 @@
 ##
 
 source src/drivers/parade/ps8625/Kconfig
+source src/drivers/parade/ps8640/Kconfig

src/drivers/parade/Makefile.inc

@@ -14,3 +14,4 @@
 ##
 
 subdirs-$(CONFIG_DRIVER_PARADE_PS8625) += ps8625/
+subdirs-$(CONFIG_DRIVER_PARADE_PS8640) += ps8640/

src/drivers/parade/ps8640/Kconfig

@@ -0,0 +1,20 @@
+##
+## This file is part of the coreboot project.
+##
+## Copyright 2015 MediaTek Inc.
+##
+## This program is free software; you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published by
+## the Free Software Foundation; version 2 of the License.
+##
+## This program is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU General Public License for more details.
+##
+
+config DRIVER_PARADE_PS8640
+	bool
+	default n
+	help
+	  Parade PS8640 MIPI DSI to eDP Converter

src/drivers/parade/ps8640/Makefile.inc

@@ -0,0 +1,16 @@
+##
+## This file is part of the coreboot project.
+##
+## Copyright 2015 MediaTek Inc.
+##
+## This program is free software; you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published by
+## the Free Software Foundation; version 2 of the License.
+##
+## This program is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU General Public License for more details.
+##
+
+ramstage-$(CONFIG_DRIVER_PARADE_PS8640) += ps8640.c

src/drivers/parade/ps8640/ps8640.c

@@ -0,0 +1,79 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2015 MediaTek Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <delay.h>
+#include <device/i2c.h>
+#include <edid.h>
+#include <console/console.h>
+#include <timer.h>
+
+#include "ps8640.h"
+
+int ps8640_get_edid(uint8_t bus, uint8_t chip, struct edid *out)
+{
+	int ret;
+	u8 edid[EDID_LENGTH * 2];
+	u32 edid_size;
+
+	i2c_writeb(bus, chip + 2, PAGE2_I2C_BYPASS,
+		   EDID_I2C_ADDR | I2C_BYPASS_EN);
+	ret = i2c_read_bytes(bus, EDID_I2C_ADDR, 0, edid, EDID_LENGTH);
+
+	if (ret != 0) {
+		printk(BIOS_INFO, "Failed to read EDID.\n");
+		return -1;
+	}
+
+	/* check if edid have extension flag, and read additional EDID data */
+	if (edid[EDID_EXTENSION_FLAG]) {
+		edid_size += EDID_LENGTH;
+		ret = i2c_read_bytes(bus, EDID_I2C_ADDR, EDID_LENGTH,
+				     &edid[EDID_LENGTH], EDID_LENGTH);
+		if (ret != 0) {
+			printk(BIOS_INFO, "Failed to read EDID ext block.\n");
+			return -1;
+		}
+	}
+
+	if (decode_edid(edid, edid_size, out)) {
+		printk(BIOS_INFO, "Failed to decode EDID.\n");
+		return -1;
+	}
+
+	return 0;
+}
+
+int ps8640_init(uint8_t bus, uint8_t chip)
+{
+	u8 set_vdo_done;
+	struct stopwatch sw;
+
+	stopwatch_init_msecs_expire(&sw, 350);
+
+	do {
+		i2c_readb(bus, chip + 2, PAGE2_GPIO_H, &set_vdo_done);
+		if (stopwatch_expired(&sw)) {
+			printk(BIOS_INFO, "Failed to init ps8640.\n");
+			return -1;
+		}
+	} while ((set_vdo_done & PS_GPIO9) != PS_GPIO9);
+
+	i2c_writeb(bus, chip + 3, PAGE3_SET_ADD, VDO_CTL_ADD);
+	i2c_writeb(bus, chip + 3, PAGE3_SET_VAL, VDO_DIS);
+	i2c_writeb(bus, chip + 3, PAGE3_SET_ADD, VDO_CTL_ADD);
+	i2c_writeb(bus, chip + 3, PAGE3_SET_VAL, VDO_EN);
+
+	return 0;
+}

src/drivers/parade/ps8640/ps8640.h

@@ -0,0 +1,45 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2015 MediaTek Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <edid.h>
+#include <types.h>
+
+#ifndef _PS8640_H_
+#define _PS8640_H_
+
+enum {
+	PAGE2_GPIO_L     = 0xa6,
+	PAGE2_GPIO_H     = 0xa7,
+	PAGE2_I2C_BYPASS = 0xea,
+	PS_GPIO9         = BIT(1),
+	I2C_BYPASS_EN    = BIT(7),
+
+	PAGE3_SET_ADD    = 0xfe,
+	PAGE3_SET_VAL    = 0xff,
+	VDO_CTL_ADD      = 0x13,
+	VDO_DIS          = 0x18,
+	VDO_EN           = 0x1c,
+};
+
+enum {
+	EDID_LENGTH         = 128,
+	EDID_I2C_ADDR       = 0x50,
+	EDID_EXTENSION_FLAG = 0x7e,
+};
+
+int ps8640_init(uint8_t bus, uint8_t chip);
+int ps8640_get_edid(uint8_t bus, uint8_t chip, struct edid *out);
+#endif
+