path: root/drivers/media/platform/s5p-tv/hdmi_drv.c

/*
 * Samsung HDMI interface driver
 *
 * Copyright (c) 2010-2011 Samsung Electronics Co., Ltd.
 *
 * Tomasz Stanislawski, <t.stanislaws@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 Foundiation. either version 2 of the License,
 * or (at your option) any later version
 */

#define pr_fmt(fmt) "s5p-tv (hdmi_drv): " fmt

#ifdef CONFIG_VIDEO_SAMSUNG_S5P_HDMI_DEBUG
#define DEBUG
#endif

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/i2c.h>
#include <linux/platform_device.h>
#include <media/v4l2-subdev.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/delay.h>
#include <linux/bug.h>
#include <linux/pm_runtime.h>
#include <linux/clk.h>
#include <linux/regulator/consumer.h>

#include <media/s5p_hdmi.h>
#include <media/v4l2-common.h>
#include <media/v4l2-dev.h>
#include <media/v4l2-device.h>

#include "regs-hdmi.h"

MODULE_AUTHOR("Tomasz Stanislawski, <t.stanislaws@samsung.com>");
MODULE_DESCRIPTION("Samsung HDMI");
MODULE_LICENSE("GPL");

/* default preset configured on probe */
#define HDMI_DEFAULT_PRESET V4L2_DV_480P59_94

struct hdmi_pulse {
	u32 beg;
	u32 end;
};

struct hdmi_timings {
	struct hdmi_pulse hact;
	u32 hsyn_pol; /* 0 - high, 1 - low */
	struct hdmi_pulse hsyn;
	u32 interlaced;
	struct hdmi_pulse vact[2];
	u32 vsyn_pol; /* 0 - high, 1 - low */
	u32 vsyn_off;
	struct hdmi_pulse vsyn[2];
};

struct hdmi_resources {
	struct clk *hdmi;
	struct clk *sclk_hdmi;
	struct clk *sclk_pixel;
	struct clk *sclk_hdmiphy;
	struct clk *hdmiphy;
	struct regulator_bulk_data *regul_bulk;
	int regul_count;
};

struct hdmi_device {
	/** base address of HDMI registers */
	void __iomem *regs;
	/** HDMI interrupt */
	unsigned int irq;
	/** pointer to device parent */
	struct device *dev;
	/** subdev generated by HDMI device */
	struct v4l2_subdev sd;
	/** V4L2 device structure */
	struct v4l2_device v4l2_dev;
	/** subdev of HDMIPHY interface */
	struct v4l2_subdev *phy_sd;
	/** subdev of MHL interface */
	struct v4l2_subdev *mhl_sd;
	/** configuration of current graphic mode */
	const struct hdmi_timings *cur_conf;
	/** flag indicating that timings are dirty */
	int cur_conf_dirty;
	/** current preset */
	u32 cur_preset;
	/** other resources */
	struct hdmi_resources res;
};

static struct platform_device_id hdmi_driver_types[] = {
	{
		.name		= "s5pv210-hdmi",
	}, {
		.name		= "exynos4-hdmi",
	}, {
		/* end node */
	}
};

static const struct v4l2_subdev_ops hdmi_sd_ops;

static struct hdmi_device *sd_to_hdmi_dev(struct v4l2_subdev *sd)
{
	return container_of(sd, struct hdmi_device, sd);
}

static inline
void hdmi_write(struct hdmi_device *hdev, u32 reg_id, u32 value)
{
	writel(value, hdev->regs + reg_id);
}

static inline
void hdmi_write_mask(struct hdmi_device *hdev, u32 reg_id, u32 value, u32 mask)
{
	u32 old = readl(hdev->regs + reg_id);
	value = (value & mask) | (old & ~mask);
	writel(value, hdev->regs + reg_id);
}

static inline
void hdmi_writeb(struct hdmi_device *hdev, u32 reg_id, u8 value)
{
	writeb(value, hdev->regs + reg_id);
}

static inline
void hdmi_writebn(struct hdmi_device *hdev, u32 reg_id, int n, u32 value)
{
	switch (n) {
	default:
		writeb(value >> 24, hdev->regs + reg_id + 12);
	case 3:
		writeb(value >> 16, hdev->regs + reg_id + 8);
	case 2:
		writeb(value >>  8, hdev->regs + reg_id + 4);
	case 1:
		writeb(value >>  0, hdev->regs + reg_id + 0);
	}
}

static inline u32 hdmi_read(struct hdmi_device *hdev, u32 reg_id)
{
	return readl(hdev->regs + reg_id);
}

static irqreturn_t hdmi_irq_handler(int irq, void *dev_data)
{
	struct hdmi_device *hdev = dev_data;
	u32