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 "drmP.h"

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

#include <drm/exynos_drm.h>
#include <plat/regs-fb-v4.h>

#include "exynos_drm_drv.h"
#include "exynos_drm_fbdev.h"
#include "exynos_drm_crtc.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.
 */

/* 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 window 0. */
#define VIDOSD_C_SIZE_W0	(VIDOSD_BASE + 0x08)
/* alpha control register for hardware window 1 ~ 4. */
#define VIDOSD_C(win)		(VIDOSD_BASE + 0x18 + (win) * 16)
/* size control register for hardware window 1 ~ 4. */
#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 * 8))
/* color key value register for hardware window 1 ~ 4. */
#define WKEYCON1_BASE(x)		((WKEYCON1 + 0x140) + (x * 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_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;
	dma_addr_t		dma_addr;
	void __iomem		*vaddr;
	unsigned int		buf_offsize;
	unsigned int		line_size;	/* bytes */
	bool			enabled;
};

struct fimd_context {
	struct exynos_drm_subdrv	subdrv;
	int				irq;
	struct drm_crtc			*crtc;
	struct clk			*bus_clk;
	struct clk			*lcd_clk;
	struct resource			*regs_res;
	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;

	struct exynos_drm_panel_info *panel;
};

static bool fimd_display_is_connected(struct device *dev)
{
	DRM_DEBUG_KMS("%s\n", __FILE__);

	/* TODO. */

	return true;
}

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

	DRM_DEBUG_KMS("%s\n", __FILE__);

	return ctx->panel;
}

static int fimd_check_timing(struct device *dev, void *timing)
{
	DRM_DEBUG_KMS("%s\n", __FILE__);

	/* TODO. */

	return 0;
}

static int fimd_display_power_on(struct device *dev, int mode)
{
	DRM_DEBUG_KMS("%s\n", __FILE__);

	/* TODO */

	return 0;
}

static struct exynos_drm_display_ops fimd_display_ops = {
	.type = EXYNOS_DISPLAY_TYPE_LCD,
	.is_connected = fimd_display_is_connected,
	.get_panel = fimd_get_panel,
	.check_timing = fimd_check_timing,
	.power_on = fimd_display_power_on,
};

static void fimd_dpms(struct device *subdrv_dev, int mode)
{
	struct fimd_context *ctx = get_fimd_context(subdrv_dev);

	DRM_DEBUG_KMS("%s, %d\n", __FILE__, mode);

	mutex_lock(&ctx->lock);

	switch (mode) {
	case DRM_MODE_DPMS_ON:
		/*
		 * enable fimd hardware only if suspended status.
		 *
		 * P.S. fimd_dpms function would be called at booting time so
		 * clk_enable could be called double time.
		 */
		if (ctx->suspended)
			pm_runtime_get_sync(subdrv_dev);
		break;
	case DRM_MODE_DPMS_STANDBY:
	case DRM_MODE_DPMS_SUSPEND:
	case DRM_MODE_DPMS_OFF:
		if (!ctx->suspended)
			pm_runtime_put_sync(subdrv_dev);
		break;
	default:
		DRM_DEBUG_KMS("unspecified mode %d\n", mode);
		break;
	}

	mutex_unlock(&ctx->lock);
}

static void fimd_apply(struct device *subdrv_dev)
{
	struct fimd_context *ctx = get_fimd_context(subdrv_dev);
	struct exynos_drm_manager *mgr = &ctx->subdrv.manager;
	struct exynos_drm_manager_ops *mgr_ops = mgr->ops;
	struct exynos_drm_overlay_ops *ovl_ops = mgr->overlay_ops;
	struct fimd_win_data *win_data;
	int i;

	DRM_DEBUG_KMS("%s\n", __FILE__);

	for (i = 0; i < WINDOWS_NR