path: root/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c

/*
 * Analogix DP (Display port) core register interface driver.
 *
 * Copyright (C) 2012 Samsung Electronics Co., Ltd.
 * Author: Jingoo Han <jg1.han@samsung.com>
 *
 * 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; either version 2 of the License, or (at your
 * option) any later version.
 */

#include <linux/device.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/gpio.h>

#include <drm/bridge/analogix_dp.h>

#include "analogix_dp_core.h"
#include "analogix_dp_reg.h"

#define COMMON_INT_MASK_1	0
#define COMMON_INT_MASK_2	0
#define COMMON_INT_MASK_3	0
#define COMMON_INT_MASK_4	(HOTPLUG_CHG | HPD_LOST | PLUG)
#define INT_STA_MASK		INT_HPD

void analogix_dp_enable_video_mute(struct analogix_dp_device *dp, bool enable)
{
	u32 reg;

	if (enable) {
		reg = readl(dp->reg_base + ANALOGIX_DP_VIDEO_CTL_1);
		reg |= HDCP_VIDEO_MUTE;
		writel(reg, dp->reg_base + ANALOGIX_DP_VIDEO_CTL_1);
	} else {
		reg = readl(dp->reg_base + ANALOGIX_DP_VIDEO_CTL_1);
		reg &= ~HDCP_VIDEO_MUTE;
		writel(reg, dp->reg_base + ANALOGIX_DP_VIDEO_CTL_1);
	}
}

void analogix_dp_stop_video(struct analogix_dp_device *dp)
{
	u32 reg;

	reg = readl(dp->reg_base + ANALOGIX_DP_VIDEO_CTL_1);
	reg &= ~VIDEO_EN;
	writel(reg, dp->reg_base + ANALOGIX_DP_VIDEO_CTL_1);
}

void analogix_dp_lane_swap(struct analogix_dp_device *dp, bool enable)
{
	u32 reg;

	if (enable)
		reg = LANE3_MAP_LOGIC_LANE_0 | LANE2_MAP_LOGIC_LANE_1 |
		      LANE1_MAP_LOGIC_LANE_2 | LANE0_MAP_LOGIC_LANE_3;
	else
		reg = LANE3_MAP_LOGIC_LANE_3 | LANE2_MAP_LOGIC_LANE_2 |
		      LANE1_MAP_LOGIC_LANE_1 | LANE0_MAP_LOGIC_LANE_0;

	writel(reg, dp->reg_base + ANALOGIX_DP_LANE_MAP);
}

void analogix_dp_init_analog_param(struct analogix_dp_device *dp)
{
	u32 reg;

	reg = TX_TERMINAL_CTRL_50_OHM;
	writel(reg, dp->reg_base + ANALOGIX_DP_ANALOG_CTL_1);

	reg = SEL_24M | TX_DVDD_BIT_1_0625V;
	writel(reg, dp->reg_base + ANALOGIX_DP_ANALOG_CTL_2);

	if (dp->plat_data && is_rockchip(dp->plat_data->dev_type)) {
		reg = REF_CLK_24M;
		if (dp->plat_data->dev_type == RK3288_DP)
			reg ^= REF_CLK_MASK;

		writel(reg, dp->reg_base + ANALOGIX_DP_PLL_REG_1);
		writel(0x95, dp->reg_base + ANALOGIX_DP_PLL_REG_2);
		writel(0x40, dp->reg_base + ANALOGIX_DP_PLL_REG_3);
		writel(0x58, dp->reg_base + ANALOGIX_DP_PLL_REG_4);
		writel(0x22, dp->reg_base + ANALOGIX_DP_PLL_REG_5);
	}

	reg = DRIVE_DVDD_BIT_1_0625V | VCO_BIT_600_MICRO;
	writel(reg, dp->reg_base + ANALOGIX_DP_ANALOG_CTL_3);

	reg = PD_RING_OSC | AUX_TERMINAL_CTRL_50_OHM |
		TX_CUR1_2X | TX_CUR_16_MA;
	writel(reg, dp->reg_base + ANALOGIX_DP_PLL_FILTER_CTL_1);

	reg = CH3_AMP_400_MV | CH2_AMP_400_MV |
		CH1_AMP_400_MV | CH0_AMP_400_MV;
	writel(reg, dp->reg_base + ANALOGIX_DP_TX_AMP_TUNING_CTL);
}

void analogix_dp_init_interrupt(struct analogix_dp_device *dp)
{
	/* Set interrupt pin assertion polarity as high */
	writel(INT_POL1 | INT_POL0, dp->reg_base + ANALOGIX_DP_INT_CTL);

	/* Clear pending regisers */
	writel(0xff, dp->reg_base + ANALOGIX_DP_COMMON_INT_STA_1);
	writel(0x4f, dp->reg_base + ANALOGIX_DP_COMMON_INT_STA_2);
	writel(0xe0, dp->reg_base + ANALOGIX_DP_COMMON_INT_STA_3);
	writel(0xe7, dp->reg_base + ANALOGIX_DP_COMMON_INT_STA_4);
	writel(0x63, dp->reg_base + ANALOGIX_DP_INT_STA);

	/* 0:mask,1: unmask */
	writel(0x00, dp->reg_base + ANALOGIX_DP_COMMON_INT_MASK_1);
	writel(0x00, dp->reg_base + ANALOGIX_DP_COMMON_INT_MASK_2);
	writel(0x00, dp->reg_base + ANALOGIX_DP_COMMON_INT_MASK_3);
	writel(0x00, dp->reg_base + ANALOGIX_DP_COMMON_INT_MASK_4);
	writel(0x00, dp->reg_base + ANALOGIX_DP_INT_STA_MASK);
}

void analogix_dp_reset(struct analogix_dp_device *dp)
{
	u32 reg;

	analogix_dp_stop_video(dp</