path: root/drivers/gpu/drm/exynos/exynos_drm_fimd.c

/* exynos_drm_fimd.c
 *
 * Copyright (C) 2011 Samsung Electronics Co.Ltd
 * Authors:
 *	Joonyoung Shim <jy0922.shim@samsung.com>
 *	Inki Dae <inki.dae@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 <drm/drmP.h>

#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/pm_runtime.h>

#include <video/of_display_timing.h>
#include <video/of_videomode.h>
#include <video/samsung_fimd.h>
#include <drm/exynos_drm.h>

#include "exynos_drm_drv.h"
#include "exynos_drm_fbdev.h"
#include "exynos_drm_crtc.h"
#include "exynos_drm_iommu.h"

/*
 * FIMD is stand for Fully Interactive Mobile Display and
 * as a display controller, it transfers contents drawn on memory
 * to a LCD Panel through Display Interfaces such as RGB or
 * CPU Interface.
 */

#define FIMD_DEFAULT_FRAMERATE 60

/* position control register for hardware window 0, 2 ~ 4.*/
#define VIDOSD_A(win)		(VIDOSD_BASE + 0x00 + (win) * 16)
#define VIDOSD_B(win)		(VIDOSD_BASE + 0x04 + (win) * 16)
/*
 * size control register for hardware windows 0 and alpha control register
 * for hardware windows 1 ~ 4
 */
#define VIDOSD_C(win)		(VIDOSD_BASE + 0x08 + (win) * 16)
/* size control register for hardware windows 1 ~ 2. */
#define VIDOSD_D(win)		(VIDOSD_BASE + 0x0C + (win) * 16)

#define VIDWx_BUF_START(win, buf)	(VIDW_BUF_START(buf) + (win) * 8)
#define VIDWx_BUF_END(win, buf)		(VIDW_BUF_END(buf) + (win) * 8)
#define VIDWx_BUF_SIZE(win, buf)	(VIDW_BUF_SIZE(buf) + (win) * 4)

/* color key control register for hardware window 1 ~ 4. */
#define WKEYCON0_BASE(x)		((WKEYCON0 + 0x140) + ((x - 1) * 8))
/* color key value register for hardware window 1 ~ 4. */
#define WKEYCON1_BASE(x)		((WKEYCON1 + 0x140) + ((x - 1) * 8))

/* FIMD has totally five hardware windows. */
#define WINDOWS_NR	5

#define get_fimd_context(dev)	platform_get_drvdata(to_platform_device(dev))

struct fimd_driver_data {
	unsigned int timing_base;

	unsigned int has_shadowcon:1;
	unsigned int has_clksel:1;
	unsigned int has_limited_fmt:1;
};

static struct fimd_driver_data s3c64xx_fimd_driver_data = {
	.timing_base = 0x0,
	.has_clksel = 1,
	.has_limited_fmt = 1,
};

static struct fimd_driver_data exynos4_fimd_driver_data = {
	.timing_base = 0x0,
	.has_shadowcon = 1,
};

static struct fimd_driver_data exynos5_fimd_driver_data = {
	.timing_base = 0x20000,
	.has_shadowcon = 1,
};

struct fimd_win_data {
	unsigned int		offset_x;
	unsigned int		offset_y;
	unsigned int		ovl_width;
	unsigned int		ovl_height;
	unsigned int		fb_width;
	unsigned int		fb_height;
	unsigned int		bpp;
	unsigned int		pixel_format;
	dma_addr_t		dma_addr;
	unsigned int		buf_offsize;
	unsigned int		line_size;	/* bytes */
	bool			enabled;
	bool			resume;
};

struct fimd_context {
	struct exynos_drm_subdrv	subdrv;
	int				irq;
	struct drm_crtc			*crtc;
	struct clk			*bus_clk;
	struct clk			*lcd_clk;
	void __iomem			*regs;
	struct fimd_win_data		win_data[WINDOWS_NR];
	unsigned int			clkdiv;
	unsigned int			default_win;
	unsigned long			irq_flags;
	u32				vidcon0;
	u32				vidcon1;
	bool				suspended;
	struct mutex			lock;
	wait_queue_head_t		wait_vsync_queue;
	atomic_t			wait_vsync_event;

	struct exynos_drm_panel_info panel;
	struct fimd_driver_data *driver_data;
};

static const struct of_device_id fimd_driver_dt_match[] = {
	{ .compatible = "samsung,s3c6400-fimd",
	  .data = &s3c64xx_fimd_driver_data },
	{ .compatible = "samsung,exynos4210-fimd",
	  .data = &exynos4_fimd_driver_data },
	{ .compatible = "samsung,exynos5250-fimd",
	  .data = &exynos5_fimd_driver_data },
	{},
};

static inline struct fimd_driver_data *drm_fimd_get_driver_data(
	struct platform_device *pdev)
{
	const struct of_device_id *of_id =
			of_match_device(fimd_driver_dt_match, &pdev->dev);

	return (struct fimd_driver_data *)of_id->data;
}

static bool fimd_display_is_connected(struct device *dev)
{
	/* TODO. */

	return true;
}

static void *fimd_get_panel(struct device *dev)
{
	struct fimd_context *ctx = get_fimd_context(dev);

	return &ctx->panel;
}

static int fimd_check_mode(struct device *dev, struct drm_display_mode *mode)
{
	/* TODO. */

	return 0;
}

static int fimd_d