/*
 * SH-Mobile High-Definition Multimedia Interface (HDMI) driver
 * for SLISHDMI13T and SLIPHDMIT IP cores
 *
 * Copyright (C) 2010, Guennadi Liakhovetski <g.liakhovetski@gmx.de>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/clk.h>
#include <linux/console.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/workqueue.h>
#include <sound/soc-dapm.h>
#include <sound/initval.h>

#include <video/sh_mobile_hdmi.h>
#include <video/sh_mobile_lcdc.h>

#include "sh_mobile_lcdcfb.h"

#define HDMI_SYSTEM_CTRL			0x00 /* System control */
#define HDMI_L_R_DATA_SWAP_CTRL_RPKT		0x01 /* L/R data swap control,
							bits 19..16 of 20-bit N for Audio Clock Regeneration packet */
#define HDMI_20_BIT_N_FOR_AUDIO_RPKT_15_8	0x02 /* bits 15..8 of 20-bit N for Audio Clock Regeneration packet */
#define HDMI_20_BIT_N_FOR_AUDIO_RPKT_7_0	0x03 /* bits 7..0 of 20-bit N for Audio Clock Regeneration packet */
#define HDMI_SPDIF_AUDIO_SAMP_FREQ_CTS		0x04 /* SPDIF audio sampling frequency,
							bits 19..16 of Internal CTS */
#define HDMI_INTERNAL_CTS_15_8			0x05 /* bits 15..8 of Internal CTS */
#define HDMI_INTERNAL_CTS_7_0			0x06 /* bits 7..0 of Internal CTS */
#define HDMI_EXTERNAL_CTS_19_16			0x07 /* External CTS */
#define HDMI_EXTERNAL_CTS_15_8			0x08 /* External CTS */
#define HDMI_EXTERNAL_CTS_7_0			0x09 /* External CTS */
#define HDMI_AUDIO_SETTING_1			0x0A /* Audio setting.1 */
#define HDMI_AUDIO_SETTING_2			0x0B /* Audio setting.2 */
#define HDMI_I2S_AUDIO_SET			0x0C /* I2S audio setting */
#define HDMI_DSD_AUDIO_SET			0x0D /* DSD audio setting */
#define HDMI_DEBUG_MONITOR_1			0x0E /* Debug monitor.1 */
#define HDMI_DEBUG_MONITOR_2			0x0F /* Debug monitor.2 */
#define HDMI_I2S_INPUT_PIN_SWAP			0x10 /* I2S input pin swap */
#define HDMI_AUDIO_STATUS_BITS_SETTING_1	0x11 /* Audio status bits setting.1 */
#define HDMI_AUDIO_STATUS_BITS_SETTING_2	0x12 /* Audio status bits setting.2 */
#define HDMI_CATEGORY_CODE			0x13 /* Category code */
#define HDMI_SOURCE_NUM_AUDIO_WORD_LEN		0x14 /* Source number/Audio word length */
#define HDMI_AUDIO_VIDEO_SETTING_1		0x15 /* Audio/Video setting.1 */
#define HDMI_VIDEO_SETTING_1			0x16 /* Video setting.1 */
#define HDMI_DEEP_COLOR_MODES			0x17 /* Deep Color Modes */

/* 12 16- and 10-bit Color space conversion parameters: 0x18..0x2f */
#define HDMI_COLOR_SPACE_CONVERSION_PARAMETERS	0x18

#define HDMI_EXTERNAL_VIDEO_PARAM_SETTINGS	0x30 /* External video parameter settings */
#define HDMI_EXTERNAL_H_TOTAL_7_0		0x31 /* External horizontal total (LSB) */
#define HDMI_EXTERNAL_H_TOTAL_11_8		0x32 /* External horizontal total (MSB) */
#define HDMI_EXTERNAL_H_BLANK_7_0		0x33 /* External horizontal blank (LSB) */
#define HDMI_EXTERNAL_H_BLANK_9_8		0x34 /* External horizontal blank (MSB) */
#define HDMI_EXTERNAL_H_DELAY_7_0		0x35 /* External horizontal delay (LSB) */
#define HDMI_EXTERNAL_H_DELAY_9_8		0x36 /* External horizontal delay (MSB) */
#define HDMI_EXTERNAL_H_DURATION_7_0		0x37 /* External horizontal duration (LSB) */
#define HDMI_EXTERNAL_H_DURATION_9_8		0x38 /* External horizontal duration (MSB) */
#define HDMI_EXTERNAL_V_TOTAL_7_0		0x39 /* External vertical total (LSB) */
#define HDMI_EXTERNAL_V_TOTAL_9_8		0x3A /* External vertical total (MSB) */
#define HDMI_AUDIO_VIDEO_SETTING_2		0x3B /* Audio/Video setting.2 */
#define HDMI_EXTERNAL_V_BLANK			0x3D /* External vertical blank */
#define HDMI_EXTERNAL_V_DELAY			0x3E /* External vertical delay */
#define HDMI_EXTERNAL_V_DURATION		0x3F /* External vertical duration */
#define HDMI_CTRL_PKT_MANUAL_SEND_CONTROL	0x40 /* Control packet manual send control */
#define HDMI_CTRL_PKT_AUTO_SEND			0x41 /* Control packet auto send with VSYNC control */
#define HDMI_AUTO_CHECKSUM_OPTION		0x42 /* Auto checksum option */
#define HDMI_VIDEO_SETTING_2			0x45 /* Video setting.2 */
#define HDMI_OUTPUT_OPTION			0x46 /* Output option */
#define HDMI_SLIPHDMIT_PARAM_OPTION		0x51 /* SLIPHDMIT parameter option */
#define HDMI_HSYNC_PMENT_AT_EMB_7_0		0x52 /* HSYNC placement at embedded sync (LSB) */
#define HDMI_HSYNC_PMENT_AT_EMB_15_8		0x53 /* HSYNC placement at embedded sync (MSB) */
#define HDMI_VSYNC_PMENT_AT_EMB_7_0		0x54 /* VSYNC placement at embedded sync (LSB) */
#define HDMI_VSYNC_PMENT_AT_EMB_14_8		0x55 /* VSYNC placement at embedded sync (MSB) */
#define HDMI_SLIPHDMIT_PARAM_SETTINGS_1		0x56 /* SLIPHDMIT parameter settings.1 */
#define HDMI_SLIPHDMIT_PARAM_SETTINGS_2		0x57 /* SLIPHDMIT parameter settings.2 */
#define HDMI_SLIPHDMIT_PARAM_SETTINGS_3		0x58 /* SLIPHDMIT parameter settings.3 */
#define HDMI_SLIPHDMIT_PARAM_SETTINGS_5		0x59 /* SLIPHDMIT parameter settings.5 */
#define HDMI_SLIPHDMIT_PARAM_SETTINGS_6		0x5A /* SLIPHDMIT parameter settings.6 */
#define HDMI_SLIPHDMIT_PARAM_SETTINGS_7		0x5B /* SLIPHDMIT parameter settings.7 */
#define HDMI_SLIPHDMIT_PARAM_SETTINGS_8		0x5C /* SLIPHDMIT parameter settings.8 */
#define HDMI_SLIPHDMIT_PARAM_SETTINGS_9		0x5D /* SLIPHDMIT parameter settings.9 */
#define HDMI_SLIPHDMIT_PARAM_SETTINGS_10	0x5E /* SLIPHDMIT parameter settings.10 */
#define HDMI_CTRL_PKT_BUF_INDEX			0x5F /* Control packet buffer index */
#define HDMI_CTRL_PKT_BUF_ACCESS_HB0		0x60 /* Control packet data buffer access window - HB0 */
#define HDMI_CTRL_PKT_BUF_ACCESS_HB1		0x61 /* Control packet data buffer access window - HB1 */
#define HDMI_CTRL_PKT_BUF_ACCESS_HB2		0x62 /* Control packet data buffer access window - HB2 */
#define HDMI_CTRL_PKT_BUF_ACCESS_PB0		0x63 /* Control packet data buffer access window - PB0 */
#define HDMI_CTRL_PKT_BUF_ACCESS_PB1		0x64 /* Control packet data buffer access window - PB1 */
#define HDMI_CTRL_PKT_BUF_ACCESS_PB2		0x65 /* Control packet data buffer access window - PB2 */
#define HDMI_CTRL_PKT_BUF_ACCESS_PB3		0x66 /* Control packet data buffer access window - PB3 */
#define HDMI_CTRL_PKT_BUF_ACCESS_PB4		0x67 /* Control packet data buffer access window - PB4 */
#define HDMI_CTRL_PKT_BUF_ACCESS_PB5		0x68 /* Control packet data buffer access window - PB5 */
#define HDMI_CTRL_PKT_BUF_ACCESS_PB6		0x69 /* Control packet data buffer access window - PB6 */
#define HDMI_CTRL_PKT_BUF_ACCESS_PB7		0x6A /* Control packet data buffer access window - PB7 */
#define HDMI_CTRL_PKT_BUF_ACCESS_PB8		0x6B /* Control packet data buffer access window - PB8 */
#define HDMI_CTRL_PKT_BUF_ACCESS_PB9		0x6C /* Control packet data buffer access window - PB9 */
#define HDMI_CTRL_PKT_BUF_ACCESS_PB10		0x6D /* Control packet data buffer access window - PB10 */
#define HDMI_CTRL_PKT_BUF_ACCESS_PB11		0x6E /* Control packet data buffer access window - PB11 */
#define HDMI_CTRL_PKT_BUF_ACCESS_PB12		0x6F /* Control packet data buffer access window - PB12 */
#define HDMI_CTRL_PKT_BUF_ACCESS_PB13		0x70 /* Control packet data buffer access window - PB13 */
#define HDMI_CTRL_PKT_BUF_ACCESS_PB14		0x71 /* Control packet data buffer access window - PB14 */
#define HDMI_CTRL_PKT_BUF_ACCESS_PB15		0x72 /* Control packet data buffer access window - PB15 */
#define HDMI_CTRL_PKT_BUF_ACCESS_PB16		0x73 /* Control packet data buffer access window - PB16 */
#define HDMI_CTRL_PKT_BUF_ACCESS_PB17		0x74 /* Control packet data buffer access window - PB17 */
#define HDMI_CTRL_PKT_BUF_ACCESS_PB18		0x75 /* Control packet data buffer access window - PB18 */
#define HDMI_CTRL_PKT_BUF_ACCESS_PB19		0x76 /* Control packet data buffer access window - PB19 */
#define HDMI_CTRL_PKT_BUF_ACCESS_PB20		0x77 /* Control packet data buffer access window - PB20 */
#define HDMI_CTRL_PKT_BUF_ACCESS_PB21		0x78 /* Control packet data buffer access window - PB21 */
#define HDMI_CTRL_PKT_BUF_ACCESS_PB22		0x79 /* Control packet data buffer access window - PB22 */
#define HDMI_CTRL_PKT_BUF_ACCESS_PB23		0x7A /* Control packet data buffer access window - PB23 */
#define HDMI_CTRL_PKT_BUF_ACCESS_PB24		0x7B /* Control packet data buffer access window - PB24 */
#define HDMI_CTRL_PKT_BUF_ACCESS_PB25		0x7C /* Control packet data buffer access window - PB25 */
#define HDMI_CTRL_PKT_BUF_ACCESS_PB26		0x7D /* Control packet data buffer access window - PB26 */
#define HDMI_CTRL_PKT_BUF_ACCESS_PB27		0x7E /* Control packet data buffer access window - PB27 */
#define HDMI_EDID_KSV_FIFO_ACCESS_WINDOW	0x80 /* EDID/KSV FIFO access window */
#define HDMI_DDC_BUS_ACCESS_FREQ_CTRL_7_0	0x81 /* DDC bus access frequency control (LSB) */
#define HDMI_DDC_BUS_ACCESS_FREQ_CTRL_15_8	0x82 /* DDC bus access frequency control (MSB) */
#define HDMI_INTERRUPT_MASK_1			0x92 /* Interrupt mask.1 */
#define HDMI_INTERRUPT_MASK_2			0x93 /* Interrupt mask.2 */
#define HDMI_INTERRUPT_STATUS_1			0x94 /* Interrupt status.1 */
#define HDMI_INTERRUPT_STATUS_2			0x95 /* Interrupt status.2 */
#define HDMI_INTERRUPT_MASK_3			0x96 /* Interrupt mask.3 */
#define HDMI_INTERRUPT_MASK_4			0x97 /* Interrupt mask.4 */
#define HDMI_INTERRUPT_STATUS_3			0x98 /* Interrupt status.3 */
#define HDMI_INTERRUPT_STATUS_4			0x99 /* Interrupt status.4 */
#define HDMI_SOFTWARE_HDCP_CONTROL_1		0x9A /* Software HDCP control.1 */
#define HDMI_FRAME_COUNTER			0x9C /* Frame counter */
#define HDMI_FRAME_COUNTER_FOR_RI_CHECK		0x9D /* Frame counter for Ri check */
#define HDMI_HDCP_CONTROL			0xAF /* HDCP control */
#define HDMI_RI_FRAME_COUNT_REGISTER		0xB2 /* Ri frame count register */
#define HDMI_DDC_BUS_CONTROL			0xB7 /* DDC bus control */
#define HDMI_HDCP_STATUS			0xB8 /* HDCP status */
#define HDMI_SHA0				0xB9 /* sha0 */
#define HDMI_SHA1				0xBA /* sha1 */
#define HDMI_SHA2				0xBB /* sha2 */
#define HDMI_SHA3				0xBC /* sha3 */
#define HDMI_SHA4				0xBD /* sha4 */
#define HDMI_BCAPS_READ				0xBE /* BCAPS read / debug */
#define HDMI_AKSV_BKSV_7_0_MONITOR		0xBF /* AKSV/BKSV[7:0] monitor */
#define HDMI_AKSV_BKSV_15_8_MONITOR		0xC0 /* AKSV/BKSV[15:8] monitor */
#define HDMI_AKSV_BKSV_23_16_MONITOR		0xC1 /* AKSV/BKSV[23:16] monitor */
#define HDMI_AKSV_BKSV_31_24_MONITOR		0xC2 /* AKSV/BKSV[31:24] monitor */
#define HDMI_AKSV_BKSV_39_32_MONITOR		0xC3 /* AKSV/BKSV[39:32] monitor */
#define HDMI_EDID_SEGMENT_POINTER		0xC4 /* EDID segment pointer */
#define HDMI_EDID_WORD_ADDRESS			0xC5 /* EDID word address */
#define HDMI_EDID_DATA_FIFO_ADDRESS		0xC6 /* EDID data FIFO address */
#define HDMI_NUM_OF_HDMI_DEVICES		0xC7 /* Number of HDMI devices */
#define HDMI_HDCP_ERROR_CODE			0xC8 /* HDCP error code */
#define HDMI_100MS_TIMER_SET			0xC9 /* 100ms timer setting */
#define HDMI_5SEC_TIMER_SET			0xCA /* 5sec timer setting */
#define HDMI_RI_READ_COUNT			0xCB /* Ri read count */
#define HDMI_AN_SEED				0xCC /* An seed */
#define HDMI_MAX_NUM_OF_RCIVRS_ALLOWED		0xCD /* Maximum number of receivers allowed */
#define HDMI_HDCP_MEMORY_ACCESS_CONTROL_1	0xCE /* HDCP memory access control.1 */
#define HDMI_HDCP_MEMORY_ACCESS_CONTROL_2	0xCF /* HDCP memory access control.2 */
#define HDMI_HDCP_CONTROL_2			0xD0 /* HDCP Control 2 */
#define HDMI_HDCP_KEY_MEMORY_CONTROL		0xD2 /* HDCP Key Memory Control */
#define HDMI_COLOR_SPACE_CONV_CONFIG_1		0xD3 /* Color space conversion configuration.1 */
#define HDMI_VIDEO_SETTING_3			0xD4 /* Video setting.3 */
#define HDMI_RI_7_0				0xD5 /* Ri[7:0] */
#define HDMI_RI_15_8				0xD6 /* Ri[15:8] */
#define HDMI_PJ					0xD7 /* Pj */
#define HDMI_SHA_RD				0xD8 /* sha_rd */
#define HDMI_RI_7_0_SAVED			0xD9 /* Ri[7:0] saved */
#define HDMI_RI_15_8_SAVED			0xDA /* Ri[15:8] saved */
#define HDMI_PJ_SAVED				0xDB /* Pj saved */
#define HDMI_NUM_OF_DEVICES			0xDC /* Number of devices */
#define HDMI_HOT_PLUG_MSENS_STATUS		0xDF /* Hot plug/MSENS status */
#define HDMI_BCAPS_WRITE			0xE0 /* bcaps */
#define HDMI_BSTAT_7_0				0xE1 /* bstat[7:0] */
#define HDMI_BSTAT_15_8				0xE2 /* bstat[15:8] */
#define HDMI_BKSV_7_0				0xE3 /* bksv[7:0] */
#define HDMI_BKSV_15_8				0xE4 /* bksv[15:8] */
#define HDMI_BKSV_23_16				0xE5 /* bksv[23:16] */
#define HDMI_BKSV_31_24				0xE6 /* bksv[31:24] */
#define HDMI_BKSV_39_32				0xE7 /* bksv[39:32] */
#define HDMI_AN_7_0				0xE8 /* An[7:0] */
#define HDMI_AN_15_8				0xE9 /* An [15:8] */
#define HDMI_AN_23_16				0xEA /* An [23:16] */
#define HDMI_AN_31_24				0xEB /* An [31:24] */
#define HDMI_AN_39_32				0xEC /* An [39:32] */
#define HDMI_AN_47_40				0xED /* An [47:40] */
#define HDMI_AN_55_48				0xEE /* An [55:48] */
#define HDMI_AN_63_56				0xEF /* An [63:56] */
#define HDMI_PRODUCT_ID				0xF0 /* Product ID */
#define HDMI_REVISION_ID			0xF1 /* Revision ID */
#define HDMI_TEST_MODE				0xFE /* Test mode */

enum hotplug_state {
	HDMI_HOTPLUG_DISCONNECTED,
	HDMI_HOTPLUG_CONNECTED,
	HDMI_HOTPLUG_EDID_DONE,
};

struct sh_hdmi {
	void __iomem *base;
	enum hotplug_state hp_state;	/* hot-plug status */
	u8 preprogrammed_vic;		/* use a pre-programmed VIC or
					   the external mode */
	u8 edid_block_addr;
	u8 edid_segment_nr;
	u8 edid_blocks;
	struct clk *hdmi_clk;
	struct device *dev;
	struct fb_info *info;
	struct mutex mutex;		/* Protect the info pointer */
	struct delayed_work edid_work;
	struct fb_var_screeninfo var;
	struct fb_monspecs monspec;
};

static void hdmi_write(struct sh_hdmi *hdmi, u8 data, u8 reg)
{
	iowrite8(data, hdmi->base + reg);
}

static u8 hdmi_read(struct sh_hdmi *hdmi, u8 reg)
{
	return ioread8(hdmi->base + reg);
}

/*
 *	HDMI sound
 */
static unsigned int sh_hdmi_snd_read(struct snd_soc_codec *codec,
				     unsigned int reg)
{
	struct sh_hdmi *hdmi = snd_soc_codec_get_drvdata(codec);

	return hdmi_read(hdmi, reg);
}

static int sh_hdmi_snd_write(struct snd_soc_codec *codec,
			     unsigned int reg,
			     unsigned int value)
{
	struct sh_hdmi *hdmi = snd_soc_codec_get_drvdata(codec);

	hdmi_write(hdmi, value, reg);
	return 0;
}

static struct snd_soc_dai_driver sh_hdmi_dai = {
	.name = "sh_mobile_hdmi-hifi",
	.playback = {
		.stream_name = "Playback",
		.channels_min = 2,
		.channels_max = 8,
		.rates = SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100  |
			 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200  |
			 SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_176400 |
			 SNDRV_PCM_RATE_192000,
		.formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE,
	},
};

static int sh_hdmi_snd_probe(struct snd_soc_codec *codec)
{
	dev_info(codec->dev, "SH Mobile HDMI Audio Codec");

	return 0;
}

static struct snd_soc_codec_driver soc_codec_dev_sh_hdmi = {
	.probe		= sh_hdmi_snd_probe,
	.read		= sh_hdmi_snd_read,
	.write		= sh_hdmi_snd_write,
};

/*
 *	HDMI video
 */

/* External video parameter settings */
static void sh_hdmi_external_video_param(struct sh_hdmi *hdmi)
{
	struct fb_var_screeninfo *var = &hdmi->var;
	u16 htotal, hblank, hdelay, vtotal, vblank, vdelay, voffset;
	u8 sync = 0;

	htotal = var->xres + var->right_margin + var->left_margin + var->hsync_len;

	hdelay = var->hsync_len + var->left_margin;
	hblank = var->right_margin + hdelay;

	/*
	 * Vertical timing looks a bit different in Figure 18,
	 * but let's try the same first by setting offset = 0
	 */
	vtotal = var->yres + var->upper_margin + var->lower_margin + var->vsync_len;

	vdelay = var->vsync_len + var->upper_margin;
	vblank = var->lower_margin + vdelay;
	voffset = min(var->upper_margin / 2, 6U);

	/*
	 * [3]: VSYNC polarity: Positive
	 * [2]: HSYNC polarity: Positive
	 * [1]: Interlace/Progressive: Progressive
	 * [0]: External video settings enable: used.
	 */
	if (var->sync & FB_SYNC_HOR_HIGH_ACT)
		sync |= 4;
	if (var->sync & FB_SYNC_VERT_HIGH_ACT)
		sync |= 8;

	dev_dbg(hdmi->dev, "H: %u, %u, %u, %u; V: %u, %u, %u, %u; sync 0x%x\n",
		htotal, hblank, hdelay, var->hsync_len,
		vtotal, vblank, vdelay, var->vsync_len, sync);

	hdmi_write(hdmi, sync | (voffset << 4), HDMI_EXTERNAL_VIDEO_PARAM_SETTINGS);

	hdmi_write(hdmi, htotal, HDMI_EXTERNAL_H_TOTAL_7_0);
	hdmi_write(hdmi, htotal >> 8, HDMI_EXTERNAL_H_TOTAL_11_8);

	hdmi_write(hdmi, hblank, HDMI_EXTERNAL_H_BLANK_7_0);
	hdmi_write(hdmi, hblank >> 8, HDMI_EXTERNAL_H_BLANK_9_8);

	hdmi_write(hdmi, hdelay, HDMI_EXTERNAL_H_DELAY_7_0);
	hdmi_write(hdmi, hdelay >> 8, HDMI_EXTERNAL_H_DELAY_9_8);

	hdmi_write(hdmi, var->hsync_len, HDMI_EXTERNAL_H_DURATION_7_0);
	hdmi_write(hdmi, var->hsync_len >> 8, HDMI_EXTERNAL_H_DURATION_9_8);

	hdmi_write(hdmi, vtotal, HDMI_EXTERNAL_V_TOTAL_7_0);
	hdmi_write(hdmi, vtotal >> 8, HDMI_EXTERNAL_V_TOTAL_9_8);

	hdmi_write(hdmi, vblank, HDMI_EXTERNAL_V_BLANK);

	hdmi_write(hdmi, vdelay, HDMI_EXTERNAL_V_DELAY);

	hdmi_write(hdmi, var->vsync_len, HDMI_EXTERNAL_V_DURATION);

	/* Set bit 0 of HDMI_EXTERNAL_VIDEO_PARAM_SETTINGS here for external mode */
	if (!hdmi->preprogrammed_vic)
		hdmi_write(hdmi, sync | 1 | (voffset << 4),
			   HDMI_EXTERNAL_VIDEO_PARAM_SETTINGS);
}

/**
 * sh_hdmi_video_config()
 */
static void sh_hdmi_video_config(struct sh_hdmi *hdmi)
{
	/*
	 * [7:4]: Audio sampling frequency: 48kHz
	 * [3:1]: Input video format: RGB and YCbCr 4:4:4 (Y on Green)
	 * [0]: Internal/External DE select: internal
	 */
	hdmi_write(hdmi, 0x20, HDMI_AUDIO_VIDEO_SETTING_1);

	/*
	 * [7:6]: Video output format: RGB 4:4:4
	 * [5:4]: Input video data width: 8 bit
	 * [3:1]: EAV/SAV location: channel 1
	 * [0]: Video input color space: RGB
	 */
	hdmi_write(hdmi, 0x34, HDMI_VIDEO_SETTING_1);

	/*
	 * [7:6]: Together with bit [6] of HDMI_AUDIO_VIDEO_SETTING_2, which is
	 * left at 0 by default, this configures 24bpp and sets the Color Depth
	 * (CD) field in the General Control Packet
	 */
	hdmi_write(hdmi, 0x20, HDMI_DEEP_COLOR_MODES);
}

/**
 * sh_hdmi_audio_config()
 */
static void sh_hdmi_audio_config(struct sh_hdmi *hdmi)
{
	u8 data;
	struct sh_mobile_hdmi_info *pdata = hdmi->dev->platform_data;

	/*
	 * [7:4] L/R data swap control
	 * [3:0] appropriate N[19:16]
	 */
	hdmi_write(hdmi, 0x00, HDMI_L_R_DATA_SWAP_CTRL_RPKT);
	/* appropriate N[15:8] */
	hdmi_write(hdmi, 0x18, HDMI_20_BIT_N_FOR_AUDIO_RPKT_15_8);
	/* appropriate N[7:0] */
	hdmi_write(hdmi, 0x00, HDMI_20_BIT_N_FOR_AUDIO_RPKT_7_0);

	/* [7:4] 48 kHz	SPDIF not used */
	hdmi_write(hdmi, 0x20, HDMI_SPDIF_AUDIO_SAMP_FREQ_CTS);

	/*
	 * [6:5] set required down sampling rate if required
	 * [4:3] set required audio source
	 */
	switch (pdata->flags & HDMI_SND_SRC_MASK) {
	default:
		/* fall through */
	case HDMI_SND_SRC_I2S:
		data = 0x0 << 3;
		break;
	case HDMI_SND_SRC_SPDIF:
		data = 0x1 << 3;
		break;
	case HDMI_SND_SRC_DSD:
		data = 0x2 << 3;
		break;
	case HDMI_SND_SRC_HBR:
		data = 0x3 << 3;
		break;
	}
	hdmi_write(hdmi, data, HDMI_AUDIO_SETTING_1);

	/* [3:0] set sending channel number for channel status */
	hdmi_write(hdmi, 0x40, HDMI_AUDIO_SETTING_2);

	/*
	 * [5:2] set valid I2S source input pin
	 * [1:0] set input I2S source mode
	 */
	hdmi_write(hdmi, 0x04, HDMI_I2S_AUDIO_SET);

	/* [7:4] set valid DSD source input pin */
	hdmi_write(hdmi, 0x00, HDMI_DSD_AUDIO_SET);

	/* [7:0] set appropriate I2S input pin swap settings if required */
	hdmi_write(hdmi, 0x00, HDMI_I2S_INPUT_PIN_SWAP);

	/*
	 * [7] set validity bit for channel status
	 * [3:0] set original sample frequency for channel status
	 */
	hdmi_write(hdmi, 0x00, HDMI_AUDIO_STATUS_BITS_SETTING_1);

	/*
	 * [7] set value for channel status
	 * [6] set value for channel status
	 * [5] set copyright bit for channel status
	 * [4:2] set additional information for channel status
	 * [1:0] set clock accuracy for channel status
	 */
	hdmi_write(hdmi, 0x00, HDMI_AUDIO_STATUS_BITS_SETTING_2);

	/* [7:0] set category code for channel status */
	hdmi_write(hdmi, 0x00, HDMI_CATEGORY_CODE);

	/*
	 * [7:4] set source number for channel status
	 * [3:0] set word length for channel status
	 */
	hdmi_write(hdmi, 0x00, HDMI_SOURCE_NUM_AUDIO_WORD_LEN);

	/* [7:4] set sample frequency for channel status */
	hdmi_write(hdmi, 0x20, HDMI_AUDIO_VIDEO_SETTING_1);
}

/**
 * sh_hdmi_phy_config() - configure the HDMI PHY for the used video mode
 */
static void sh_hdmi_phy_config(struct sh_hdmi *hdmi)
{
	if (hdmi->var.pixclock < 10000) {
		/* for 1080p8bit 148MHz */
		hdmi_write(hdmi, 0x1d, HDMI_SLIPHDMIT_PARAM_SETTINGS_1);
		hdmi_write(hdmi, 0x00, HDMI_SLIPHDMIT_PARAM_SETTINGS_2);
		hdmi_write(hdmi, 0x00, HDMI_SLIPHDMIT_PARAM_SETTINGS_3);
		hdmi_write(hdmi, 0x4c, HDMI_SLIPHDMIT_PARAM_SETTINGS_5);
		hdmi_write(hdmi, 0x1e, HDMI_SLIPHDMIT_PARAM_SETTINGS_6);
		hdmi_write(hdmi, 0x48, HDMI_SLIPHDMIT_PARAM_SETTINGS_7);
		hdmi_write(hdmi, 0x0e, HDMI_SLIPHDMIT_PARAM_SETTINGS_8);
		hdmi_write(hdmi, 0x25, HDMI_SLIPHDMIT_PARAM_SETTINGS_9);
		hdmi_write(hdmi, 0x04, HDMI_SLIPHDMIT_PARAM_SETTINGS_10);
	} else if (hdmi->var.pixclock < 30000) {
		/* 720p, 8bit, 74.25MHz. Might need to be adjusted for other formats */
		/*
		 * [1:0]	Speed_A
		 * [3:2]	Speed_B
		 * [4]		PLLA_Bypass
		 * [6]		DRV_TEST_EN
		 * [7]		DRV_TEST_IN
		 */
		hdmi_write(hdmi, 0x0f, HDMI_SLIPHDMIT_PARAM_SETTINGS_1);
		/* PLLB_CONFIG[17], PLLA_CONFIG[17] - not in PHY datasheet */
		hdmi_write(hdmi, 0x00, HDMI_SLIPHDMIT_PARAM_SETTINGS_2);
		/*
		 * [2:0]	BGR_I_OFFSET
		 * [6:4]	BGR_V_OFFSET
		 */
		hdmi_write(hdmi, 0x00, HDMI_SLIPHDMIT_PARAM_SETTINGS_3);
		/* PLLA_CONFIG[7:0]: VCO gain, VCO offset, LPF resistance[0] */
		hdmi_write(hdmi, 0x44, HDMI_SLIPHDMIT_PARAM_SETTINGS_5);
		/*
		 * PLLA_CONFIG[15:8]: regulator voltage[0], CP current,
		 * LPF capacitance, LPF resistance[1]
		 */
		hdmi_write(hdmi, 0x32, HDMI_SLIPHDMIT_PARAM_SETTINGS_6);
		/* PLLB_CONFIG[7:0]: LPF resistance[0], VCO offset, VCO gain */
		hdmi_write(hdmi, 0x4A, HDMI_SLIPHDMIT_PARAM_SETTINGS_7);
		/*
		 * PLLB_CONFIG[15:8]: regulator voltage[0], CP current,
		 * LPF capacitance, LPF resistance[1]
		 */
		hdmi_write(hdmi, 0x00, HDMI_SLIPHDMIT_PARAM_SETTINGS_8);
		/* DRV_CONFIG, PE_CONFIG */
		hdmi_write(hdmi, 0x25, HDMI_SLIPHDMIT_PARAM_SETTINGS_9);
		/*
		 * [2:0]	AMON_SEL (4 == LPF voltage)
		 * [4]		PLLA_CONFIG[16]
		 * [5]		PLLB_CONFIG[16]
		 */
		hdmi_write(hdmi, 0x04, HDMI_SLIPHDMIT_PARAM_SETTINGS_10);
	} else {
		/* for 480p8bit 27MHz */
		hdmi_write(hdmi, 0x19, HDMI_SLIPHDMIT_PARAM_SETTINGS_1);
		hdmi_write(hdmi, 0x00, HDMI_SLIPHDMIT_PARAM_SETTINGS_2);
		hdmi_write(hdmi, 0x00, HDMI_SLIPHDMIT_PARAM_SETTINGS_3);
		hdmi_write(hdmi, 0x44, HDMI_SLIPHDMIT_PARAM_SETTINGS_5);
		hdmi_write(hdmi, 0x32, HDMI_SLIPHDMIT_PARAM_SETTINGS_6);
		hdmi_write(hdmi, 0x48, HDMI_SLIPHDMIT_PARAM_SETTINGS_7);
		hdmi_write(hdmi, 0x0F, HDMI_SLIPHDMIT_PARAM_SETTINGS_8);
		hdmi_write(hdmi, 0x20, HDMI_SLIPHDMIT_PARAM_SETTINGS_9);
		hdmi_write(hdmi, 0x04, HDMI_SLIPHDMIT_PARAM_SETTINGS_10);
	}
}

/**
 * sh_hdmi_avi_infoframe_setup() - Auxiliary Video Information InfoFrame CONTROL PACKET
 */
static void sh_hdmi_avi_infoframe_setup(struct sh_hdmi *hdmi)
{
	u8 vic;

	/* AVI InfoFrame */
	hdmi_write(hdmi, 0x06, HDMI_CTRL_PKT_BUF_INDEX);

	/* Packet Type = 0x82 */
	hdmi_write(hdmi, 0x82, HDMI_CTRL_PKT_BUF_ACCESS_HB0);

	/* Version = 0x02 */
	hdmi_write(hdmi, 0x02, HDMI_CTRL_PKT_BUF_ACCESS_HB1);

	/* Length = 13 (0x0D) */
	hdmi_write(hdmi, 0x0D, HDMI_CTRL_PKT_BUF_ACCESS_HB2);

	/* N. A. Checksum */
	hdmi_write(hdmi, 0x00, HDMI_CTRL_PKT_BUF_ACCESS_PB0);

	/*
	 * Y = RGB
	 * A0 = No Data
	 * B = Bar Data not valid
	 * S = No Data
	 */
	hdmi_write(hdmi, 0x00, HDMI_CTRL_PKT_BUF_ACCESS_PB1);

	/*
	 * [7:6] C = Colorimetry: no data
	 * [5:4] M = 2: 16:9, 1: 4:3 Picture Aspect Ratio
	 * [3:0] R = 8: Active Frame Aspect Ratio: same as picture aspect ratio
	 */
	hdmi_write(hdmi, 0x28, HDMI_CTRL_PKT_BUF_ACCESS_PB2);

	/*
	 * ITC = No Data
	 * EC = xvYCC601
	 * Q = Default (depends on video format)
	 * SC = No Known non_uniform Scaling
	 */
	hdmi_write(hdmi, 0x00, HDMI_CTRL_PKT_BUF_ACCESS_PB3);

	/*
	 * VIC should be ignored if external config is used, so, we could just use 0,
	 * but play safe and use a valid value in any case just in case
	 */
	if (hdmi->preprogrammed_vic)
		vic = hdmi->preprogrammed_vic;
	else
		vic = 4;
	hdmi_write(hdmi, vic, HDMI_CTRL_PKT_BUF_ACCESS_PB4);

	/* PR = No Repetition */
	hdmi_write(hdmi, 0x00, HDMI_CTRL_PKT_BUF_ACCESS_PB5);

	/* Line Number of End of Top Bar (lower 8 bits) */
	hdmi_write(hdmi, 0x00, HDMI_CTRL_PKT_BUF_ACCESS_PB6);

	/* Line Number of End of Top Bar (upper 8 bits) */
	hdmi_write(hdmi, 0x00, HDMI_CTRL_PKT_BUF_ACCESS_PB7);

	/* Line Number of Start of Bottom Bar (lower 8 bits) */
	hdmi_write(hdmi, 0x00, HDMI_CTRL_PKT_BUF_ACCESS_PB8);

	/* Line Number of Start of Bottom Bar (upper 8 bits) */
	hdmi_write(hdmi, 0x00, HDMI_CTRL_PKT_BUF_ACCESS_PB9);

	/* Pixel Number of End of Left Bar (lower 8 bits) */
	hdmi_write(hdmi, 0x00, HDMI_CTRL_PKT_BUF_ACCESS_PB10);

	/* Pixel Number of End of Left Bar (upper 8 bits) */
	hdmi_write(hdmi, 0x00, HDMI_CTRL_PKT_BUF_ACCESS_PB11);

	/* Pixel Number of Start of Right Bar (lower 8 bits) */
	hdmi_write(hdmi, 0x00, HDMI_CTRL_PKT_BUF_ACCESS_PB12);

	/* Pixel Number of Start of Right Bar (upper 8 bits) */
	hdmi_write(hdmi, 0x00, HDMI_CTRL_PKT_BUF_ACCESS_PB13);
}

/**
 * sh_hdmi_audio_infoframe_setup() - Audio InfoFrame of CONTROL PACKET
 */
static void sh_hdmi_audio_infoframe_setup(struct sh_hdmi *hdmi)
{
	/* Audio InfoFrame */
	hdmi_write(hdmi, 0x08, HDMI_CTRL_PKT_BUF_INDEX);

	/* Packet Type = 0x84 */
	hdmi_write(hdmi, 0x84, HDMI_CTRL_PKT_BUF_ACCESS_HB0);

	/* Version Number = 0x01 */
	hdmi_write(hdmi, 0x01, HDMI_CTRL_PKT_BUF_ACCESS_HB1);

	/* 0 Length = 10 (0x0A) */
	hdmi_write(hdmi, 0x0A, HDMI_CTRL_PKT_BUF_ACCESS_HB2);

	/* n. a. Checksum */
	hdmi_write(hdmi, 0x00, HDMI_CTRL_PKT_BUF_ACCESS_PB0);

	/* Audio Channel Count = Refer to Stream Header */
	hdmi_write(hdmi, 0x00, HDMI_CTRL_PKT_BUF_ACCESS_PB1);

	/* Refer to Stream Header */
	hdmi_write(hdmi, 0x00, HDMI_CTRL_PKT_BUF_ACCESS_PB2);

	/* Format depends on coding type (i.e. CT0...CT3) */
	hdmi_write(hdmi, 0x00, HDMI_CTRL_PKT_BUF_ACCESS_PB3);

	/* Speaker Channel Allocation = Front Right + Front Left */
	hdmi_write(hdmi, 0x00, HDMI_CTRL_PKT_BUF_ACCESS_PB4);

	/* Level Shift Value = 0 dB, Down - mix is permitted or no information */
	hdmi_write(hdmi, 0x00, HDMI_CTRL_PKT_BUF_ACCESS_PB5);

	/* Reserved (0) */
	hdmi_write(hdmi, 0x00, HDMI_CTRL_PKT_BUF_ACCESS_PB6);
	hdmi_write(hdmi, 0x00, HDMI_CTRL_PKT_BUF_ACCESS_PB7);
	hdmi_write(hdmi, 0x00, HDMI_CTRL_PKT_BUF_ACCESS_PB8);
	hdmi_write(hdmi, 0x00, HDMI_CTRL_PKT_BUF_ACCESS_PB9);
	hdmi_write(hdmi, 0x00, HDMI_CTRL_PKT_BUF_ACCESS_PB10);
}

/**
 * sh_hdmi_configure() - Initialise HDMI for output
 */
static void sh_hdmi_configure(struct sh_hdmi *hdmi)
{
	/* Configure video format */
	sh_hdmi_video_config(hdmi);

	/* Configure audio format */
	sh_hdmi_audio_config(hdmi);

	/* Configure PHY */
	sh_hdmi_phy_config(hdmi);

	/* Auxiliary Video Information (AVI) InfoFrame */
	sh_hdmi_avi_infoframe_setup(hdmi);

	/* Audio InfoFrame */
	sh_hdmi_audio_infoframe_setup(hdmi);

	/*
	 * Control packet auto send with VSYNC control: auto send
	 * General control, Gamut metadata, ISRC, and ACP packets
	 */
	hdmi_write(hdmi, 0x8E, HDMI_CTRL_PKT_AUTO_SEND);

	/* FIXME */
	msleep(10);

	/* PS mode b->d, reset PLLA and PLLB */
	hdmi_write(hdmi, 0x4C, HDMI_SYSTEM_CTRL);

	udelay(10);

	hdmi_write(hdmi, 0x40, HDMI_SYSTEM_CTRL);
}

static unsigned long sh_hdmi_rate_error(struct sh_hdmi *hdmi,
		const struct fb_videomode *mode,
		unsigned long *hdmi_rate, unsigned long *parent_rate)
{
	unsigned long target = PICOS2KHZ(mode->pixclock) * 1000, rate_error;
	struct sh_mobile_hdmi_info *pdata = hdmi->dev->platform_data;

	*hdmi_rate = clk_round_rate(hdmi->hdmi_clk, target);
	if ((long)*hdmi_rate < 0)
		*hdmi_rate = clk_get_rate(hdmi->hdmi_clk);

	rate_error = (long)*hdmi_rate > 0 ? abs(*hdmi_rate - target) : ULONG_MAX;
	if (rate_error && pdata->clk_optimize_parent)
		rate_error = pdata->clk_optimize_parent(target, hdmi_rate, parent_rate);
	else if (clk_get_parent(hdmi->hdmi_clk))
		*parent_rate = clk_get_rate(clk_get_parent(hdmi->hdmi_clk));

	dev_dbg(hdmi->dev, "%u-%u-%u-%u x %u-%u-%u-%u\n",
		mode->left_margin, mode->xres,
		mode->right_margin, mode->hsync_len,
		mode->upper_margin, mode->yres,
		mode->lower_margin, mode->vsync_len);

	dev_dbg(hdmi->dev, "\t@%lu(+/-%lu)Hz, e=%lu / 1000, r=%uHz, p=%luHz\n", target,
		rate_error, rate_error ? 10000 / (10 * target / rate_error) : 0,
		mode->refresh, *parent_rate);

	return rate_error;
}

static int sh_hdmi_read_edid(struct sh_hdmi *hdmi, unsigned long *hdmi_rate,
			     unsigned long *parent_rate)
{
	struct fb_var_screeninfo tmpvar;
	struct fb_var_screeninfo *var = &tmpvar;
	const struct fb_videomode *mode, *found = NULL;
	struct fb_info *info = hdmi->info;
	struct fb_modelist *modelist = NULL;
	unsigned int f_width = 0, f_height = 0, f_refresh = 0;
	unsigned long found_rate_error = ULONG_MAX; /* silly compiler... */
	bool exact_match = false;
	u8 edid[128];
	char *forced;
	int i;

	/* Read EDID */
	dev_dbg(hdmi->dev, "Read back EDID code:");
	for (i = 0; i < 128; i++) {
		edid[i] = hdmi_read(hdmi, HDMI_EDID_KSV_FIFO_ACCESS_WINDOW);
#ifdef DEBUG
		if ((i % 16) == 0) {
			printk(KERN_CONT "\n");
			printk(KERN_DEBUG "%02X | %02X", i, edid[i]);
		} else {
			printk(KERN_CONT " %02X", edid[i]);
		}
#endif
	}
#ifdef DEBUG
	printk(KERN_CONT "\n");
#endif

	if (!hdmi->edid_blocks) {
		fb_edid_to_monspecs(edid, &hdmi->monspec);
		hdmi->edid_blocks = edid[126] + 1;

		dev_dbg(hdmi->dev, "%d main modes, %d extension blocks\n",
			hdmi->monspec.modedb_len, hdmi->edid_blocks - 1);
	} else {
		dev_dbg(hdmi->dev, "Extension %u detected, DTD start %u\n",
			edid[0], edid[2]);
		fb_edid_add_monspecs(edid, &hdmi->monspec);
	}

	if (hdmi->edid_blocks > hdmi->edid_segment_nr * 2 +
	    (hdmi->edid_block_addr >> 7) + 1) {
		/* More blocks to read */
		if (hdmi->edid_block_addr) {
			hdmi->edid_block_addr = 0;
			hdmi->edid_segment_nr++;
		} else {
			hdmi->edid_block_addr = 0x80;
		}
		/* Set EDID word address  */
		hdmi_write(hdmi, hdmi->edid_block_addr, HDMI_EDID_WORD_ADDRESS);
		/* Enable EDID interrupt */
		hdmi_write(hdmi, 0xC6, HDMI_INTERRUPT_MASK_1);
		/* Set EDID segment pointer - starts reading EDID */
		hdmi_write(hdmi, hdmi->edid_segment_nr, HDMI_EDID_SEGMENT_POINTER);
		return -EAGAIN;
	}

	/* All E-EDID blocks ready */
	dev_dbg(hdmi->dev, "%d main and extended modes\n", hdmi->monspec.modedb_len);

	fb_get_options("sh_mobile_lcdc", &forced);
	if (forced && *forced) {
		/* Only primitive parsing so far */
		i = sscanf(forced, "%ux%u@%u",
			   &f_width, &f_height, &f_refresh);
		if (i < 2) {
			f_width = 0;
			f_height = 0;
		}
		dev_dbg(hdmi->dev, "Forced mode %ux%u@%uHz\n",
			f_width, f_height, f_refresh);
	}

	/* Walk monitor modes to find the best or the exact match */
	for (i = 0, mode = hdmi->monspec.modedb;
	     f_width && f_height && i < hdmi->monspec.modedb_len && !exact_match;
	     i++, mode++) {
		unsigned long rate_error;

		/* No interest in unmatching modes */
		if (f_width != mode->xres || f_height != mode->yres)
			continue;

		rate_error = sh_hdmi_rate_error(hdmi, mode, hdmi_rate, parent_rate);

		if (f_refresh == mode->refresh || (!f_refresh && !rate_error))
			/*
			 * Exact match if either the refresh rate matches or it
			 * hasn't been specified and we've found a mode, for
			 * which we can configure the clock precisely
			 */
			exact_match = true;
		else if (found && found_rate_error <= rate_error)
			/*
			 * We otherwise search for the closest matching clock
			 * rate - either if no refresh rate has been specified
			 * or we cannot find an exactly matching one
			 */
			continue;

		/* Check if supported: sufficient fb memory, supported clock-rate */
		fb_videomode_to_var(var, mode);

		if (info && info->fbops->fb_check_var &&
		    info->fbops->fb_check_var(var, info)) {
			exact_match = false;
			continue;
		}

		found = mode;
		found_rate_error = rate_error;
	}

	hdmi->var.width = hdmi->monspec.max_x * 10;
	hdmi->var.height = hdmi->monspec.max_y * 10;

	/*
	 * TODO 1: if no ->info is present, postpone running the config until
	 * after ->info first gets registered.
	 * TODO 2: consider registering the HDMI platform device from the LCDC
	 * driver, and passing ->info with HDMI platform data.
	 */
	if (info && !found) {
		modelist = hdmi->info->modelist.next &&
			!list_empty(&hdmi->info->modelist) ?
			list_entry(hdmi->info->modelist.next,
				   struct fb_modelist, list) :
			NULL;

		if (modelist) {
			found = &modelist->mode;
			found_rate_error = sh_hdmi_rate_error(hdmi, found, hdmi_rate, parent_rate);
		}
	}

	/* No cookie today */
	if (!found)
		return -ENXIO;

	if (found->xres == 640 && found->yres == 480 && found->refresh == 60)
		hdmi->preprogrammed_vic = 1;
	else if (found->xres == 720 && found->yres == 480 && found->refresh == 60)
		hdmi->preprogrammed_vic = 2;
	else if (found->xres == 720 && found->yres == 576 && found->refresh == 50)
		hdmi->preprogrammed_vic = 17;
	else if (found->xres == 1280 && found->yres == 720 && found->refresh == 60)
		hdmi->preprogrammed_vic = 4;
	else if (found->xres == 1920 && found->yres == 1080 && found->refresh == 24)
		hdmi->preprogrammed_vic = 32;
	else if (found->xres == 1920 && found->yres == 1080 && found->refresh == 50)
		hdmi->preprogrammed_vic = 31;
	else if (found->xres == 1920 && found->yres == 1080 && found->refresh == 60)
		hdmi->preprogrammed_vic = 16;
	else
		hdmi->preprogrammed_vic = 0;

	dev_dbg(hdmi->dev, "Using %s %s mode %ux%u@%uHz (%luHz), clock error %luHz\n",
		modelist ? "default" : "EDID", hdmi->preprogrammed_vic ? "VIC" : "external",
		found->xres, found->yres, found->refresh,
		PICOS2KHZ(found->pixclock) * 1000, found_rate_error);

	fb_videomode_to_var(&hdmi->var, found);
	sh_hdmi_external_video_param(hdmi);

	return 0;
}

static irqreturn_t sh_hdmi_hotplug(int irq, void *dev_id)
{
	struct sh_hdmi *hdmi = dev_id;
	u8 status1, status2, mask1, mask2;

	/* mode_b and PLLA and PLLB reset */
	hdmi_write(hdmi, 0x2C, HDMI_SYSTEM_CTRL);

	/* How long shall reset be held? */
	udelay(10);

	/* mode_b and PLLA and PLLB reset release */
	hdmi_write(hdmi, 0x20, HDMI_SYSTEM_CTRL);

	status1 = hdmi_read(hdmi, HDMI_INTERRUPT_STATUS_1);
	status2 = hdmi_read(hdmi, HDMI_INTERRUPT_STATUS_2);

	mask1 = hdmi_read(hdmi, HDMI_INTERRUPT_MASK_1);
	mask2 = hdmi_read(hdmi, HDMI_INTERRUPT_MASK_2);

	/* Correct would be to ack only set bits, but the datasheet requires 0xff */
	hdmi_write(hdmi, 0xFF, HDMI_INTERRUPT_STATUS_1);
	hdmi_write(hdmi, 0xFF, HDMI_INTERRUPT_STATUS_2);

	if (printk_ratelimit())
		dev_dbg(hdmi->dev, "IRQ #%d: Status #1: 0x%x & 0x%x, #2: 0x%x & 0x%x\n",
			irq, status1, mask1, status2, mask2);

	if (!((status1 & mask1) | (status2 & mask2))) {
		return IRQ_NONE;
	} else if (status1 & 0xc0) {
		u8 msens;

		/* Datasheet specifies 10ms... */
		udelay(500);

		msens = hdmi_read(hdmi, HDMI_HOT_PLUG_MSENS_STATUS);
		dev_dbg(hdmi->dev, "MSENS 0x%x\n", msens);
		/* Check, if hot plug & MSENS pin status are both high */
		if ((msens & 0xC0) == 0xC0) {
			/* Display plug in */
			hdmi->edid_segment_nr = 0;
			hdmi->edid_block_addr = 0;
			hdmi->edid_blocks = 0;
			hdmi->hp_state = HDMI_HOTPLUG_CONNECTED;

			/* Set EDID word address  */
			hdmi_write(hdmi, 0x00, HDMI_EDID_WORD_ADDRESS);
			/* Enable EDID interrupt */
			hdmi_write(hdmi, 0xC6, HDMI_INTERRUPT_MASK_1);
			/* Set EDID segment pointer - starts reading EDID */
			hdmi_write(hdmi, 0x00, HDMI_EDID_SEGMENT_POINTER);
		} else if (!(status1 & 0x80)) {
			/* Display unplug, beware multiple interrupts */
			if (hdmi->hp_state != HDMI_HOTPLUG_DISCONNECTED) {
				hdmi->hp_state = HDMI_HOTPLUG_DISCONNECTED;
				schedule_delayed_work(&hdmi->edid_work, 0);
			}
			/* display_off will switch back to mode_a */
		}
	} else if (status1 & 2) {
		/* EDID error interrupt: retry */
		/* Set EDID word address  */
		hdmi_write(hdmi, hdmi->edid_block_addr, HDMI_EDID_WORD_ADDRESS);
		/* Set EDID segment pointer */
		hdmi_write(hdmi, hdmi->edid_segment_nr, HDMI_EDID_SEGMENT_POINTER);
	} else if (status1 & 4) {
		/* Disable EDID interrupt */
		hdmi_write(hdmi, 0xC0, HDMI_INTERRUPT_MASK_1);
		schedule_delayed_work(&hdmi->edid_work, msecs_to_jiffies(10));
	}

	return IRQ_HANDLED;
}

/* locking:	called with info->lock held, or before register_framebuffer() */
static void sh_hdmi_display_on(void *arg, struct fb_info *info)
{
	/*
	 * info is guaranteed to be valid, when we are called, because our
	 * FB_EVENT_FB_UNBIND notify is also called with info->lock held
	 */
	struct sh_hdmi *hdmi = arg;
	struct sh_mobile_hdmi_info *pdata = hdmi->dev->platform_data;
	struct sh_mobile_lcdc_chan *ch = info->par;

	dev_dbg(hdmi->dev, "%s(%p): state %x\n", __func__,
		pdata->lcd_dev, info->state);

	/* No need to lock */
	hdmi->info = info;

	/*
	 * hp_state can be set to
	 * HDMI_HOTPLUG_DISCONNECTED:	on monitor unplug
	 * HDMI_HOTPLUG_CONNECTED:	on monitor plug-in
	 * HDMI_HOTPLUG_EDID_DONE:	on EDID read completion
	 */
	switch (hdmi->hp_state) {
	case HDMI_HOTPLUG_EDID_DONE:
		/* PS mode d->e. All functions are active */
		hdmi_write(hdmi, 0x80, HDMI_SYSTEM_CTRL);
		dev_dbg(hdmi->dev, "HDMI running\n");
		break;
	case HDMI_HOTPLUG_DISCONNECTED:
		info->state = FBINFO_STATE_SUSPENDED;
	default:
		hdmi->var = ch->display_var;
	}
}

/* locking: called with info->lock held */
static void sh_hdmi_display_off(void *arg)
{
	struct sh_hdmi *hdmi = arg;
	struct sh_mobile_hdmi_info *pdata = hdmi->dev->platform_data;

	dev_dbg(hdmi->dev, "%s(%p)\n", __func__, pdata->lcd_dev);
	/* PS mode e->a */
	hdmi_write(hdmi, 0x10, HDMI_SYSTEM_CTRL);
}

static bool sh_hdmi_must_reconfigure(struct sh_hdmi *hdmi)
{
	struct fb_info *info = hdmi->info;
	struct sh_mobile_lcdc_chan *ch = info->par;
	struct fb_var_screeninfo *new_var = &hdmi->var, *old_var = &ch->display_var;
	struct fb_videomode mode1, mode2;

	fb_var_to_videomode(&mode1, old_var);
	fb_var_to_videomode(&mode2, new_var);

	dev_dbg(info->dev, "Old %ux%u, new %ux%u\n",
		mode1.xres, mode1.yres, mode2.xres, mode2.yres);

	if (fb_mode_is_equal(&mode1, &mode2)) {
		/* It can be a different monitor with an equal video-mode */
		old_var->width = new_var->width;
		old_var->height = new_var->height;
		return false;
	}

	dev_dbg(info->dev, "Switching %u -> %u lines\n",
		mode1.yres, mode2.yres);
	*old_var = *new_var;

	return true;
}

/**
 * sh_hdmi_clk_configure() - set HDMI clock frequency and enable the clock
 * @hdmi:		driver context
 * @hdmi_rate:		HDMI clock frequency in Hz
 * @parent_rate:	if != 0 - set parent clock rate for optimal precision
 * return:		configured positive rate if successful
 *			0 if couldn't set the rate, but managed to enable the
 *			clock, negative error, if couldn't enable the clock
 */
static long sh_hdmi_clk_configure(struct sh_hdmi *hdmi, unsigned long hdmi_rate,
				  unsigned long parent_rate)
{
	int ret;

	if (parent_rate && clk_get_parent(hdmi->hdmi_clk)) {
		ret = clk_set_rate(clk_get_parent(hdmi->hdmi_clk), parent_rate);
		if (ret < 0) {
			dev_warn(hdmi->dev, "Cannot set parent rate %ld: %d\n", parent_rate, ret);
			hdmi_rate = clk_round_rate(hdmi->hdmi_clk, hdmi_rate);
		} else {
			dev_dbg(hdmi->dev, "HDMI set parent frequency %lu\n", parent_rate);
		}
	}

	ret = clk_set_rate(hdmi->hdmi_clk, hdmi_rate);
	if (ret < 0) {
		dev_warn(hdmi->dev, "Cannot set rate %ld: %d\n", hdmi_rate, ret);
		hdmi_rate = 0;
	} else {
		dev_dbg(hdmi->dev, "HDMI set frequency %lu\n", hdmi_rate);
	}

	return hdmi_rate;
}

/* Hotplug interrupt occurred, read EDID */
static void sh_hdmi_edid_work_fn(struct work_struct *work)
{
	struct sh_hdmi *hdmi = container_of(work, struct sh_hdmi, edid_work.work);
	struct sh_mobile_hdmi_info *pdata = hdmi->dev->platform_data;
	struct sh_mobile_lcdc_chan *ch;
	int ret;

	dev_dbg(hdmi->dev, "%s(%p): begin, hotplug status %d\n", __func__,
		pdata->lcd_dev, hdmi->hp_state);

	if (!pdata->lcd_dev)
		return;

	mutex_lock(&hdmi->mutex);

	if (hdmi->hp_state == HDMI_HOTPLUG_CONNECTED) {
		unsigned long parent_rate = 0, hdmi_rate;

		/* A device has been plugged in */
		pm_runtime_get_sync(hdmi->dev);

		ret = sh_hdmi_read_edid(hdmi, &hdmi_rate, &parent_rate);
		if (ret < 0)
			goto out;

		hdmi->hp_state = HDMI_HOTPLUG_EDID_DONE;

		/* Reconfigure the clock */
		ret = sh_hdmi_clk_configure(hdmi, hdmi_rate, parent_rate);
		if (ret < 0)
			goto out;

		msleep(10);
		sh_hdmi_configure(hdmi);
		/* Switched to another (d) power-save mode */
		msleep(10);

		if (!hdmi->info)
			goto out;

		ch = hdmi->info->par;

		acquire_console_sem();

		/* HDMI plug in */
		if (!sh_hdmi_must_reconfigure(hdmi) &&
		    hdmi->info->state == FBINFO_STATE_RUNNING) {
			/*
			 * First activation with the default monitor - just turn
			 * on, if we run a resume here, the logo disappears
			 */
			if (lock_fb_info(hdmi->info)) {
				struct fb_info *info = hdmi->info;
				info->var.width = hdmi->var.width;
				info->var.height = hdmi->var.height;
				sh_hdmi_display_on(hdmi, info);
				unlock_fb_info(info);
			}
		} else {
			/* New monitor or have to wake up */
			fb_set_suspend(hdmi->info, 0);
		}

		release_console_sem();
	} else {
		ret = 0;
		if (!hdmi->info)
			goto out;

		hdmi->monspec.modedb_len = 0;
		fb_destroy_modedb(hdmi->monspec.modedb);
		hdmi->monspec.modedb = NULL;

		acquire_console_sem();

		/* HDMI disconnect */
		fb_set_suspend(hdmi->info, 1);

		release_console_sem();
		pm_runtime_put(hdmi->dev);
	}

out:
	if (ret < 0 && ret != -EAGAIN)
		hdmi->hp_state = HDMI_HOTPLUG_DISCONNECTED;
	mutex_unlock(&hdmi->mutex);

	dev_dbg(hdmi->dev, "%s(%p): end\n", __func__, pdata->lcd_dev);
}

static int sh_hdmi_notify(struct notifier_block *nb,
			  unsigned long action, void *data);

static struct notifier_block sh_hdmi_notifier = {
	.notifier_call = sh_hdmi_notify,
};

static int sh_hdmi_notify(struct notifier_block *nb,
			  unsigned long action, void *data)
{
	struct fb_event *event = data;
	struct fb_info *info = event->info;
	struct sh_mobile_lcdc_chan *ch = info->par;
	struct sh_mobile_lcdc_board_cfg	*board_cfg = &ch->cfg.board_cfg;
	struct sh_hdmi *hdmi = board_cfg->board_data;

	if (nb != &sh_hdmi_notifier || !hdmi || hdmi->info != info)
		return NOTIFY_DONE;

	switch(action) {
	case FB_EVENT_FB_REGISTERED:
		/* Unneeded, activation taken care by sh_hdmi_display_on() */
		break;
	case FB_EVENT_FB_UNREGISTERED:
		/*
		 * We are called from unregister_framebuffer() with the
		 * info->lock held. This is bad for us, because we can race with
		 * the scheduled work, which has to call fb_set_suspend(), which
		 * takes info->lock internally, so, sh_hdmi_edid_work_fn()
		 * cannot take and hold info->lock for the whole function
		 * duration. Using an additional lock creates a classical AB-BA
		 * lock up. Therefore, we have to release the info->lock
		 * temporarily, synchronise with the work queue and re-acquire
		 * the info->lock.
		 */
		unlock_fb_info(hdmi->info);
		mutex_lock(&hdmi->mutex);
		hdmi->info = NULL;
		mutex_unlock(&hdmi->mutex);
		lock_fb_info(hdmi->info);
		return NOTIFY_OK;
	}
	return NOTIFY_DONE;
}

static int __init sh_hdmi_probe(struct platform_device *pdev)
{
	struct sh_mobile_hdmi_info *pdata = pdev->dev.platform_data;
	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	struct sh_mobile_lcdc_board_cfg	*board_cfg;
	int irq = platform_get_irq(pdev, 0), ret;
	struct sh_hdmi *hdmi;
	long rate;

	if (!res || !pdata || irq < 0)
		return -ENODEV;

	hdmi = kzalloc(sizeof(*hdmi), GFP_KERNEL);
	if (!hdmi) {
		dev_err(&pdev->dev, "Cannot allocate device data\n");
		return -ENOMEM;
	}

	mutex_init(&hdmi->mutex);

	hdmi->dev = &pdev->dev;

	hdmi->hdmi_clk = clk_get(&pdev->dev, "ick");
	if (IS_ERR(hdmi->hdmi_clk)) {
		ret = PTR_ERR(hdmi->hdmi_clk);
		dev_err(&pdev->dev, "Unable to get clock: %d\n", ret);
		goto egetclk;
	}

	/* An arbitrary relaxed pixclock just to get things started: from standard 480p */
	rate = clk_round_rate(hdmi->hdmi_clk, PICOS2KHZ(37037));
	if (rate > 0)
		rate = sh_hdmi_clk_configure(hdmi, rate, 0);

	if (rate < 0) {
		ret = rate;
		goto erate;
	}

	ret = clk_enable(hdmi->hdmi_clk);
	if (ret < 0) {
		dev_err(hdmi->dev, "Cannot enable clock: %d\n", ret);
		goto erate;
	}

	dev_dbg(&pdev->dev, "Enabled HDMI clock at %luHz\n", rate);

	if (!request_mem_region(res->start, resource_size(res), dev_name(&pdev->dev))) {
		dev_err(&pdev->dev, "HDMI register region already claimed\n");
		ret = -EBUSY;
		goto ereqreg;
	}

	hdmi->base = ioremap(res->start, resource_size(res));
	if (!hdmi->base) {
		dev_err(&pdev->dev, "HDMI register region already claimed\n");
		ret = -ENOMEM;
		goto emap;
	}

	platform_set_drvdata(pdev, hdmi);

	/* Set up LCDC callbacks */
	board_cfg = &pdata->lcd_chan->board_cfg;
	board_cfg->owner = THIS_MODULE;
	board_cfg->board_data = hdmi;
	board_cfg->display_on = sh_hdmi_display_on;
	board_cfg->display_off = sh_hdmi_display_off;

	INIT_DELAYED_WORK(&hdmi->edid_work, sh_hdmi_edid_work_fn);

	pm_runtime_enable(&pdev->dev);
	pm_runtime_resume(&pdev->dev);

	/* Product and revision IDs are 0 in sh-mobile version */
	dev_info(&pdev->dev, "Detected HDMI controller 0x%x:0x%x\n",
		 hdmi_read(hdmi, HDMI_PRODUCT_ID), hdmi_read(hdmi, HDMI_REVISION_ID));

	ret = request_irq(irq, sh_hdmi_hotplug, 0,
			  dev_name(&pdev->dev), hdmi);
	if (ret < 0) {
		dev_err(&pdev->dev, "Unable to request irq: %d\n", ret);
		goto ereqirq;
	}

	ret = snd_soc_register_codec(&pdev->dev,
			&soc_codec_dev_sh_hdmi, &sh_hdmi_dai, 1);
	if (ret < 0) {
		dev_err(&pdev->dev, "codec registration failed\n");
		goto ecodec;
	}

	return 0;

ecodec:
	free_irq(irq, hdmi);
ereqirq:
	pm_runtime_disable(&pdev->dev);
	iounmap(hdmi->base);
emap:
	release_mem_region(res->start, resource_size(res));
ereqreg:
	clk_disable(hdmi->hdmi_clk);
erate:
	clk_put(hdmi->hdmi_clk);
egetclk:
	mutex_destroy(&hdmi->mutex);
	kfree(hdmi);

	return ret;
}

static int __exit sh_hdmi_remove(struct platform_device *pdev)
{
	struct sh_mobile_hdmi_info *pdata = pdev->dev.platform_data;
	struct sh_hdmi *hdmi = platform_get_drvdata(pdev);
	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	struct sh_mobile_lcdc_board_cfg	*board_cfg = &pdata->lcd_chan->board_cfg;
	int irq = platform_get_irq(pdev, 0);

	snd_soc_unregister_codec(&pdev->dev);

	board_cfg->display_on = NULL;
	board_cfg->display_off = NULL;
	board_cfg->board_data = NULL;
	board_cfg->owner = NULL;

	/* No new work will be scheduled, wait for running ISR */
	free_irq(irq, hdmi);
	/* Wait for already scheduled work */
	cancel_delayed_work_sync(&hdmi->edid_work);
	pm_runtime_disable(&pdev->dev);
	clk_disable(hdmi->hdmi_clk);
	clk_put(hdmi->hdmi_clk);
	iounmap(hdmi->base);
	release_mem_region(res->start, resource_size(res));
	mutex_destroy(&hdmi->mutex);
	kfree(hdmi);

	return 0;
}

static struct platform_driver sh_hdmi_driver = {
	.remove		= __exit_p(sh_hdmi_remove),
	.driver = {
		.name	= "sh-mobile-hdmi",
	},
};

static int __init sh_hdmi_init(void)
{
	return platform_driver_probe(&sh_hdmi_driver, sh_hdmi_probe);
}
module_init(sh_hdmi_init);

static void __exit sh_hdmi_exit(void)
{
	platform_driver_unregister(&sh_hdmi_driver);
}
module_exit(sh_hdmi_exit);

MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
MODULE_DESCRIPTION("SuperH / ARM-shmobile HDMI driver");
MODULE_LICENSE("GPL v2");
