path: root/drivers/video/s3c-fb.c

/* linux/drivers/video/s3c-fb.c
 *
 * Copyright 2008 Openmoko Inc.
 * Copyright 2008-2010 Simtec Electronics
 *      Ben Dooks <ben@simtec.co.uk>
 *      http://armlinux.simtec.co.uk/
 *
 * Samsung SoC Framebuffer driver
 *
 * 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/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/clk.h>
#include <linux/fb.h>
#include <linux/io.h>

#include <mach/map.h>
#include <plat/regs-fb-v4.h>
#include <plat/fb.h>

/* This driver will export a number of framebuffer interfaces depending
 * on the configuration passed in via the platform data. Each fb instance
 * maps to a hardware window. Currently there is no support for runtime
 * setting of the alpha-blending functions that each window has, so only
 * window 0 is actually useful.
 *
 * Window 0 is treated specially, it is used for the basis of the LCD
 * output timings and as the control for the output power-down state.
*/

/* note, the previous use of <mach/regs-fb.h> to get platform specific data
 * has been replaced by using the platform device name to pick the correct
 * configuration data for the system.
*/

#ifdef CONFIG_FB_S3C_DEBUG_REGWRITE
#undef writel
#define writel(v, r) do { \
	printk(KERN_DEBUG "%s: %08x => %p\n", __func__, (unsigned int)v, r); \
	__raw_writel(v, r); } while(0)
#endif /* FB_S3C_DEBUG_REGWRITE */

struct s3c_fb;

#define VALID_BPP(x) (1 << ((x) - 1))

#define OSD_BASE(win, variant) ((variant).osd + ((win) * (variant).osd_stride))
#define VIDOSD_A(win, variant) (OSD_BASE(win, variant) + 0x00)
#define VIDOSD_B(win, variant) (OSD_BASE(win, variant) + 0x04)
#define VIDOSD_C(win, variant) (OSD_BASE(win, variant) + 0x08)
#define VIDOSD_D(win, variant) (OSD_BASE(win, variant) + 0x0C)

/**
 * struct s3c_fb_variant - fb variant information
 * @is_2443: Set if S3C2443/S3C2416 style hardware.
 * @nr_windows: The number of windows.
 * @vidtcon: The base for the VIDTCONx registers
 * @wincon: The base for the WINxCON registers.
 * @winmap: The base for the WINxMAP registers.
 * @keycon: The abse for the WxKEYCON registers.
 * @buf_start: Offset of buffer start registers.
 * @buf_size: Offset of buffer size registers.
 * @buf_end: Offset of buffer end registers.
 * @osd: The base for the OSD registers.
 * @palette: Address of palette memory, or 0 if none.
 */
struct s3c_fb_variant {
	unsigned int	is_2443:1;
	unsigned short	nr_windows;
	unsigned short	vidtcon;
	unsigned short	wincon;
	unsigned short	winmap;
	unsigned short	keycon;
	unsigned short	buf_start;
	unsigned short	buf_end;
	unsigned short	buf_size;
	unsigned short	osd;
	unsigned short	osd_stride;
	unsigned short	palette[S3C_FB_MAX_WIN];
};

/**
 * struct s3c_fb_win_variant
 * @has_osd_c: Set if has OSD C register.
 * @has_osd_d: Set if has OSD D register.
 * @palette_sz: Size of palette in entries.
 * @palette_16bpp: Set if palette is 16bits wide.
 * @valid_bpp: 1 bit per BPP setting to show valid bits-per-pixel.
 *
 * valid_bpp bit x is set if (x+1)BPP is supported.
 */
struct s3c_fb_win_variant {
	unsigned int	has_osd_c:1;
	unsigned int	has_osd_d:1;
	unsigned int