include/video/vga.h - kernel/msm-4.9 - Gitiles

 /*
  * linux/include/video/vga.h -- standard VGA chipset interaction
  *
  * Copyright 1999 Jeff Garzik <jgarzik@pobox.com>
  *
  * Copyright history from vga16fb.c:
  *	Copyright 1999 Ben Pfaff and Petr Vandrovec
  *	Based on VGA info at http://www.goodnet.com/~tinara/FreeVGA/home.htm
  *	Based on VESA framebuffer (c) 1998 Gerd Knorr
  *
  * This file is subject to the terms and conditions of the GNU General
  * Public License.  See the file COPYING in the main directory of this
  * archive for more details.
  *
  */

 #ifndef __linux_video_vga_h__
 #define __linux_video_vga_h__

 #include <linux/config.h>
 #include <linux/types.h>
 #include <asm/io.h>
 #ifndef CONFIG_AMIGA
 #include <asm/vga.h>
 #else
 /*
  * FIXME
  * Ugh, we don't have PCI space, so map readb() and friends to use Zorro space
  * for MMIO accesses. This should make cirrusfb work again on Amiga
  */
 #undef inb_p
 #undef inw_p
 #undef outb_p
 #undef outw
 #undef readb
 #undef writeb
 #undef writew
 #define inb_p(port)	0
 #define inw_p(port)	0
 #define outb_p(port, val)	do { } while (0)
 #define outw(port, val)		do { } while (0)
 #define readb		z_readb
 #define writeb		z_writeb
 #define writew		z_writew
 #endif
 #include <asm/byteorder.h>


 /* Some of the code below is taken from SVGAlib.  The original,
    unmodified copyright notice for that code is below. */
 /* VGAlib version 1.2 - (c) 1993 Tommy Frandsen                    */
 /*                                                                 */
 /* This library is free software; you can redistribute it and/or   */
 /* modify it without any restrictions. This library is distributed */
 /* in the hope that it will be useful, but without any warranty.   */

 /* Multi-chipset support Copyright 1993 Harm Hanemaayer */
 /* partially copyrighted (C) 1993 by Hartmut Schirmer */

 /* VGA data register ports */
 #define VGA_CRT_DC  	0x3D5	/* CRT Controller Data Register - color emulation */
 #define VGA_CRT_DM  	0x3B5	/* CRT Controller Data Register - mono emulation */
 #define VGA_ATT_R   	0x3C1	/* Attribute Controller Data Read Register */
 #define VGA_ATT_W   	0x3C0	/* Attribute Controller Data Write Register */
 #define VGA_GFX_D   	0x3CF	/* Graphics Controller Data Register */
 #define VGA_SEQ_D   	0x3C5	/* Sequencer Data Register */
 #define VGA_MIS_R   	0x3CC	/* Misc Output Read Register */
 #define VGA_MIS_W   	0x3C2	/* Misc Output Write Register */
 #define VGA_FTC_R	0x3CA	/* Feature Control Read Register */
 #define VGA_IS1_RC  	0x3DA	/* Input Status Register 1 - color emulation */
 #define VGA_IS1_RM  	0x3BA	/* Input Status Register 1 - mono emulation */
 #define VGA_PEL_D   	0x3C9	/* PEL Data Register */
 #define VGA_PEL_MSK 	0x3C6	/* PEL mask register */

 /* EGA-specific registers */
 #define EGA_GFX_E0	0x3CC	/* Graphics enable processor 0 */
 #define EGA_GFX_E1	0x3CA	/* Graphics enable processor 1 */

 /* VGA index register ports */
 #define VGA_CRT_IC  	0x3D4	/* CRT Controller Index - color emulation */
 #define VGA_CRT_IM  	0x3B4	/* CRT Controller Index - mono emulation */
 #define VGA_ATT_IW  	0x3C0	/* Attribute Controller Index & Data Write Register */
 #define VGA_GFX_I   	0x3CE	/* Graphics Controller Index */
 #define VGA_SEQ_I   	0x3C4	/* Sequencer Index */
 #define VGA_PEL_IW  	0x3C8	/* PEL Write Index */
 #define VGA_PEL_IR  	0x3C7	/* PEL Read Index */

 /* standard VGA indexes max counts */
 #define VGA_CRT_C   	0x19	/* Number of CRT Controller Registers */
 #define VGA_ATT_C   	0x15	/* Number of Attribute Controller Registers */
 #define VGA_GFX_C   	0x09	/* Number of Graphics Controller Registers */
 #define VGA_SEQ_C   	0x05	/* Number of Sequencer Registers */
 #define VGA_MIS_C   	0x01	/* Number of Misc Output Register */

 /* VGA misc register bit masks */
 #define VGA_MIS_COLOR		0x01
 #define VGA_MIS_ENB_MEM_ACCESS	0x02
 #define VGA_MIS_DCLK_28322_720	0x04
 #define VGA_MIS_ENB_PLL_LOAD	(0x04 | 0x08)
 #define VGA_MIS_SEL_HIGH_PAGE	0x20

 /* VGA CRT controller register indices */
 #define VGA_CRTC_H_TOTAL	0
 #define VGA_CRTC_H_DISP		1
 #define VGA_CRTC_H_BLANK_START	2
 #define VGA_CRTC_H_BLANK_END	3
 #define VGA_CRTC_H_SYNC_START	4
 #define VGA_CRTC_H_SYNC_END	5
 #define VGA_CRTC_V_TOTAL	6
 #define VGA_CRTC_OVERFLOW	7
 #define VGA_CRTC_PRESET_ROW	8
 #define VGA_CRTC_MAX_SCAN	9
 #define VGA_CRTC_CURSOR_START	0x0A
 #define VGA_CRTC_CURSOR_END	0x0B
 #define VGA_CRTC_START_HI	0x0C
 #define VGA_CRTC_START_LO	0x0D
 #define VGA_CRTC_CURSOR_HI	0x0E
 #define VGA_CRTC_CURSOR_LO	0x0F
 #define VGA_CRTC_V_SYNC_START	0x10
 #define VGA_CRTC_V_SYNC_END	0x11
 #define VGA_CRTC_V_DISP_END	0x12
 #define VGA_CRTC_OFFSET		0x13
 #define VGA_CRTC_UNDERLINE	0x14
 #define VGA_CRTC_V_BLANK_START	0x15
 #define VGA_CRTC_V_BLANK_END	0x16
 #define VGA_CRTC_MODE		0x17
 #define VGA_CRTC_LINE_COMPARE	0x18
 #define VGA_CRTC_REGS		VGA_CRT_C

 /* VGA CRT controller bit masks */
 #define VGA_CR11_LOCK_CR0_CR7	0x80 /* lock writes to CR0 - CR7 */
 #define VGA_CR17_H_V_SIGNALS_ENABLED 0x80

 /* VGA attribute controller register indices */
 #define VGA_ATC_PALETTE0	0x00
 #define VGA_ATC_PALETTE1	0x01
 #define VGA_ATC_PALETTE2	0x02
 #define VGA_ATC_PALETTE3	0x03
 #define VGA_ATC_PALETTE4	0x04
 #define VGA_ATC_PALETTE5	0x05
 #define VGA_ATC_PALETTE6	0x06
 #define VGA_ATC_PALETTE7	0x07
 #define VGA_ATC_PALETTE8	0x08
 #define VGA_ATC_PALETTE9	0x09
 #define VGA_ATC_PALETTEA	0x0A
 #define VGA_ATC_PALETTEB	0x0B
 #define VGA_ATC_PALETTEC	0x0C
 #define VGA_ATC_PALETTED	0x0D
 #define VGA_ATC_PALETTEE	0x0E
 #define VGA_ATC_PALETTEF	0x0F
 #define VGA_ATC_MODE		0x10
 #define VGA_ATC_OVERSCAN	0x11
 #define VGA_ATC_PLANE_ENABLE	0x12
 #define VGA_ATC_PEL		0x13
 #define VGA_ATC_COLOR_PAGE	0x14

 #define VGA_AR_ENABLE_DISPLAY	0x20

 /* VGA sequencer register indices */
 #define VGA_SEQ_RESET		0x00
 #define VGA_SEQ_CLOCK_MODE	0x01
 #define VGA_SEQ_PLANE_WRITE	0x02
 #define VGA_SEQ_CHARACTER_MAP	0x03
 #define VGA_SEQ_MEMORY_MODE	0x04

 /* VGA sequencer register bit masks */
 #define VGA_SR01_CHAR_CLK_8DOTS	0x01 /* bit 0: character clocks 8 dots wide are generated */
 #define VGA_SR01_SCREEN_OFF	0x20 /* bit 5: Screen is off */
 #define VGA_SR02_ALL_PLANES	0x0F /* bits 3-0: enable access to all planes */
 #define VGA_SR04_EXT_MEM	0x02 /* bit 1: allows complete mem access to 256K */
 #define VGA_SR04_SEQ_MODE	0x04 /* bit 2: directs system to use a sequential addressing mode */
 #define VGA_SR04_CHN_4M		0x08 /* bit 3: selects modulo 4 addressing for CPU access to display memory */

 /* VGA graphics controller register indices */
 #define VGA_GFX_SR_VALUE	0x00
 #define VGA_GFX_SR_ENABLE	0x01
 #define VGA_GFX_COMPARE_VALUE	0x02
 #define VGA_GFX_DATA_ROTATE	0x03
 #define VGA_GFX_PLANE_READ	0x04
 #define VGA_GFX_MODE		0x05
 #define VGA_GFX_MISC		0x06
 #define VGA_GFX_COMPARE_MASK	0x07
 #define VGA_GFX_BIT_MASK	0x08

 /* VGA graphics controller bit masks */
 #define VGA_GR06_GRAPHICS_MODE	0x01

 /* macro for composing an 8-bit VGA register index and value
  * into a single 16-bit quantity */
 #define VGA_OUT16VAL(v, r)       (((v) << 8) | (r))

 /* decide whether we should enable the faster 16-bit VGA register writes */
 #ifdef __LITTLE_ENDIAN
 #define VGA_OUTW_WRITE
 #endif

 /* VGA State Save and Restore */
 #define VGA_SAVE_FONT0 1  /* save/restore plane 2 fonts	  */
 #define VGA_SAVE_FONT1 2  /* save/restore plane 3 fonts   */
 #define VGA_SAVE_TEXT  4  /* save/restore plane 0/1 fonts */
 #define VGA_SAVE_FONTS 7  /* save/restore all fonts	  */
 #define VGA_SAVE_MODE  8  /* save/restore video mode 	  */
 #define VGA_SAVE_CMAP  16 /* save/restore color map/DAC   */

 struct vgastate {
 	void __iomem *vgabase;	/* mmio base, if supported 		   */
 	unsigned long membase;	/* VGA window base, 0 for default - 0xA000 */
 	__u32 memsize;		/* VGA window size, 0 for default 64K	   */
 	__u32 flags;		/* what state[s] to save (see VGA_SAVE_*)  */
 	__u32 depth;		/* current fb depth, not important	   */
 	__u32 num_attr;		/* number of att registers, 0 for default  */
 	__u32 num_crtc;		/* number of crt registers, 0 for default  */
 	__u32 num_gfx;		/* number of gfx registers, 0 for default  */
 	__u32 num_seq;		/* number of seq registers, 0 for default  */
 	void *vidstate;
 };

 extern int save_vga(struct vgastate *state);
 extern int restore_vga(struct vgastate *state);

 /*
  * generic VGA port read/write
  */

 static inline unsigned char vga_io_r (unsigned short port)
 {
 	return inb_p(port);
 }

 static inline void vga_io_w (unsigned short port, unsigned char val)
 {
 	outb_p(val, port);
 }

 static inline void vga_io_w_fast (unsigned short port, unsigned char reg,
 				  unsigned char val)
 {
 	outw(VGA_OUT16VAL (val, reg), port);
 }

 static inline unsigned char vga_mm_r (void __iomem *regbase, unsigned short port)
 {
 	return readb (regbase + port);
 }

 static inline void vga_mm_w (void __iomem *regbase, unsigned short port, unsigned char val)
 {
 	writeb (val, regbase + port);
 }

 static inline void vga_mm_w_fast (void __iomem *regbase, unsigned short port,
 				  unsigned char reg, unsigned char val)
 {
 	writew (VGA_OUT16VAL (val, reg), regbase + port);
 }

 static inline unsigned char vga_r (void __iomem *regbase, unsigned short port)
 {
 	if (regbase)
 		return vga_mm_r (regbase, port);
 	else
 		return vga_io_r (port);
 }

 static inline void vga_w (void __iomem *regbase, unsigned short port, unsigned char val)
 {
 	if (regbase)
 		vga_mm_w (regbase, port, val);
 	else
 		vga_io_w (port, val);
 }


 static inline void vga_w_fast (void __iomem *regbase, unsigned short port,
 			       unsigned char reg, unsigned char val)
 {
 	if (regbase)
 		vga_mm_w_fast (regbase, port, reg, val);
 	else
 		vga_io_w_fast (port, reg, val);
 }


 /*
  * VGA CRTC register read/write
  */

 static inline unsigned char vga_rcrt (void __iomem *regbase, unsigned char reg)
 {
         vga_w (regbase, VGA_CRT_IC, reg);
         return vga_r (regbase, VGA_CRT_DC);
 }

 static inline void vga_wcrt (void __iomem *regbase, unsigned char reg, unsigned char val)
 {
 #ifdef VGA_OUTW_WRITE
 	vga_w_fast (regbase, VGA_CRT_IC, reg, val);
 #else
         vga_w (regbase, VGA_CRT_IC, reg);
         vga_w (regbase, VGA_CRT_DC, val);
 #endif /* VGA_OUTW_WRITE */
 }

 static inline unsigned char vga_io_rcrt (unsigned char reg)
 {
         vga_io_w (VGA_CRT_IC, reg);
         return vga_io_r (VGA_CRT_DC);
 }

 static inline void vga_io_wcrt (unsigned char reg, unsigned char val)
 {
 #ifdef VGA_OUTW_WRITE
 	vga_io_w_fast (VGA_CRT_IC, reg, val);
 #else
         vga_io_w (VGA_CRT_IC, reg);
         vga_io_w (VGA_CRT_DC, val);
 #endif /* VGA_OUTW_WRITE */
 }

 static inline unsigned char vga_mm_rcrt (void __iomem *regbase, unsigned char reg)
 {
         vga_mm_w (regbase, VGA_CRT_IC, reg);
         return vga_mm_r (regbase, VGA_CRT_DC);
 }

 static inline void vga_mm_wcrt (void __iomem *regbase, unsigned char reg, unsigned char val)
 {
 #ifdef VGA_OUTW_WRITE
 	vga_mm_w_fast (regbase, VGA_CRT_IC, reg, val);
 #else
         vga_mm_w (regbase, VGA_CRT_IC, reg);
         vga_mm_w (regbase, VGA_CRT_DC, val);
 #endif /* VGA_OUTW_WRITE */
 }


 /*
  * VGA sequencer register read/write
  */

 static inline unsigned char vga_rseq (void __iomem *regbase, unsigned char reg)
 {
         vga_w (regbase, VGA_SEQ_I, reg);
         return vga_r (regbase, VGA_SEQ_D);
 }

 static inline void vga_wseq (void __iomem *regbase, unsigned char reg, unsigned char val)
 {
 #ifdef VGA_OUTW_WRITE
 	vga_w_fast (regbase, VGA_SEQ_I, reg, val);
 #else
         vga_w (regbase, VGA_SEQ_I, reg);
         vga_w (regbase, VGA_SEQ_D, val);
 #endif /* VGA_OUTW_WRITE */
 }

 static inline unsigned char vga_io_rseq (unsigned char reg)
 {
         vga_io_w (VGA_SEQ_I, reg);
         return vga_io_r (VGA_SEQ_D);
 }

 static inline void vga_io_wseq (unsigned char reg, unsigned char val)
 {
 #ifdef VGA_OUTW_WRITE
 	vga_io_w_fast (VGA_SEQ_I, reg, val);
 #else
         vga_io_w (VGA_SEQ_I, reg);
         vga_io_w (VGA_SEQ_D, val);
 #endif /* VGA_OUTW_WRITE */
 }

 static inline unsigned char vga_mm_rseq (void __iomem *regbase, unsigned char reg)
 {
         vga_mm_w (regbase, VGA_SEQ_I, reg);
         return vga_mm_r (regbase, VGA_SEQ_D);
 }

 static inline void vga_mm_wseq (void __iomem *regbase, unsigned char reg, unsigned char val)
 {
 #ifdef VGA_OUTW_WRITE
 	vga_mm_w_fast (regbase, VGA_SEQ_I, reg, val);
 #else
         vga_mm_w (regbase, VGA_SEQ_I, reg);
         vga_mm_w (regbase, VGA_SEQ_D, val);
 #endif /* VGA_OUTW_WRITE */
 }

 /*
  * VGA graphics controller register read/write
  */

 static inline unsigned char vga_rgfx (void __iomem *regbase, unsigned char reg)
 {
         vga_w (regbase, VGA_GFX_I, reg);
         return vga_r (regbase, VGA_GFX_D);
 }

 static inline void vga_wgfx (void __iomem *regbase, unsigned char reg, unsigned char val)
 {
 #ifdef VGA_OUTW_WRITE
 	vga_w_fast (regbase, VGA_GFX_I, reg, val);
 #else
         vga_w (regbase, VGA_GFX_I, reg);
         vga_w (regbase, VGA_GFX_D, val);
 #endif /* VGA_OUTW_WRITE */
 }

 static inline unsigned char vga_io_rgfx (unsigned char reg)
 {
         vga_io_w (VGA_GFX_I, reg);
         return vga_io_r (VGA_GFX_D);
 }

 static inline void vga_io_wgfx (unsigned char reg, unsigned char val)
 {
 #ifdef VGA_OUTW_WRITE
 	vga_io_w_fast (VGA_GFX_I, reg, val);
 #else
         vga_io_w (VGA_GFX_I, reg);
         vga_io_w (VGA_GFX_D, val);
 #endif /* VGA_OUTW_WRITE */
 }

 static inline unsigned char vga_mm_rgfx (void __iomem *regbase, unsigned char reg)
 {
         vga_mm_w (regbase, VGA_GFX_I, reg);
         return vga_mm_r (regbase, VGA_GFX_D);
 }

 static inline void vga_mm_wgfx (void __iomem *regbase, unsigned char reg, unsigned char val)
 {
 #ifdef VGA_OUTW_WRITE
 	vga_mm_w_fast (regbase, VGA_GFX_I, reg, val);
 #else
         vga_mm_w (regbase, VGA_GFX_I, reg);
         vga_mm_w (regbase, VGA_GFX_D, val);
 #endif /* VGA_OUTW_WRITE */
 }


 /*
  * VGA attribute controller register read/write
  */

 static inline unsigned char vga_rattr (void __iomem *regbase, unsigned char reg)
 {
         vga_w (regbase, VGA_ATT_IW, reg);
         return vga_r (regbase, VGA_ATT_R);
 }

 static inline void vga_wattr (void __iomem *regbase, unsigned char reg, unsigned char val)
 {
         vga_w (regbase, VGA_ATT_IW, reg);
         vga_w (regbase, VGA_ATT_W, val);
 }

 static inline unsigned char vga_io_rattr (unsigned char reg)
 {
         vga_io_w (VGA_ATT_IW, reg);
         return vga_io_r (VGA_ATT_R);
 }

 static inline void vga_io_wattr (unsigned char reg, unsigned char val)
 {
         vga_io_w (VGA_ATT_IW, reg);
         vga_io_w (VGA_ATT_W, val);
 }

 static inline unsigned char vga_mm_rattr (void __iomem *regbase, unsigned char reg)
 {
         vga_mm_w (regbase, VGA_ATT_IW, reg);
         return vga_mm_r (regbase, VGA_ATT_R);
 }

 static inline void vga_mm_wattr (void __iomem *regbase, unsigned char reg, unsigned char val)
 {
         vga_mm_w (regbase, VGA_ATT_IW, reg);
         vga_mm_w (regbase, VGA_ATT_W, val);
 }

 #endif /* __linux_video_vga_h__ */
	/*
	* linux/include/video/vga.h -- standard VGA chipset interaction
	*
	* Copyright 1999 Jeff Garzik <jgarzik@pobox.com>
	*
	* Copyright history from vga16fb.c:
	* Copyright 1999 Ben Pfaff and Petr Vandrovec
	* Based on VGA info at http://www.goodnet.com/~tinara/FreeVGA/home.htm
	* Based on VESA framebuffer (c) 1998 Gerd Knorr
	*
	* This file is subject to the terms and conditions of the GNU General
	* Public License. See the file COPYING in the main directory of this
	* archive for more details.
	*
	*/

	#ifndef __linux_video_vga_h__
	#define __linux_video_vga_h__

	#include <linux/config.h>
	#include <linux/types.h>
	#include <asm/io.h>
	#ifndef CONFIG_AMIGA
	#include <asm/vga.h>
	#else
	/*
	* FIXME
	* Ugh, we don't have PCI space, so map readb() and friends to use Zorro space
	* for MMIO accesses. This should make cirrusfb work again on Amiga
	*/
	#undef inb_p
	#undef inw_p
	#undef outb_p
	#undef outw
	#undef readb
	#undef writeb
	#undef writew
	#define inb_p(port) 0
	#define inw_p(port) 0
	#define outb_p(port, val) do { } while (0)
	#define outw(port, val) do { } while (0)
	#define readb z_readb
	#define writeb z_writeb
	#define writew z_writew
	#endif
	#include <asm/byteorder.h>


	/* Some of the code below is taken from SVGAlib. The original,
	unmodified copyright notice for that code is below. */
	/* VGAlib version 1.2 - (c) 1993 Tommy Frandsen */
	/* */
	/* This library is free software; you can redistribute it and/or */
	/* modify it without any restrictions. This library is distributed */
	/* in the hope that it will be useful, but without any warranty. */

	/* Multi-chipset support Copyright 1993 Harm Hanemaayer */
	/* partially copyrighted (C) 1993 by Hartmut Schirmer */

	/* VGA data register ports */
	#define VGA_CRT_DC 0x3D5 /* CRT Controller Data Register - color emulation */
	#define VGA_CRT_DM 0x3B5 /* CRT Controller Data Register - mono emulation */
	#define VGA_ATT_R 0x3C1 /* Attribute Controller Data Read Register */
	#define VGA_ATT_W 0x3C0 /* Attribute Controller Data Write Register */
	#define VGA_GFX_D 0x3CF /* Graphics Controller Data Register */
	#define VGA_SEQ_D 0x3C5 /* Sequencer Data Register */
	#define VGA_MIS_R 0x3CC /* Misc Output Read Register */
	#define VGA_MIS_W 0x3C2 /* Misc Output Write Register */
	#define VGA_FTC_R 0x3CA /* Feature Control Read Register */
	#define VGA_IS1_RC 0x3DA /* Input Status Register 1 - color emulation */
	#define VGA_IS1_RM 0x3BA /* Input Status Register 1 - mono emulation */
	#define VGA_PEL_D 0x3C9 /* PEL Data Register */
	#define VGA_PEL_MSK 0x3C6 /* PEL mask register */

	/* EGA-specific registers */
	#define EGA_GFX_E0 0x3CC /* Graphics enable processor 0 */
	#define EGA_GFX_E1 0x3CA /* Graphics enable processor 1 */

	/* VGA index register ports */
	#define VGA_CRT_IC 0x3D4 /* CRT Controller Index - color emulation */
	#define VGA_CRT_IM 0x3B4 /* CRT Controller Index - mono emulation */
	#define VGA_ATT_IW 0x3C0 /* Attribute Controller Index & Data Write Register */
	#define VGA_GFX_I 0x3CE /* Graphics Controller Index */
	#define VGA_SEQ_I 0x3C4 /* Sequencer Index */
	#define VGA_PEL_IW 0x3C8 /* PEL Write Index */
	#define VGA_PEL_IR 0x3C7 /* PEL Read Index */

	/* standard VGA indexes max counts */
	#define VGA_CRT_C 0x19 /* Number of CRT Controller Registers */
	#define VGA_ATT_C 0x15 /* Number of Attribute Controller Registers */
	#define VGA_GFX_C 0x09 /* Number of Graphics Controller Registers */
	#define VGA_SEQ_C 0x05 /* Number of Sequencer Registers */
	#define VGA_MIS_C 0x01 /* Number of Misc Output Register */

	/* VGA misc register bit masks */
	#define VGA_MIS_COLOR 0x01
	#define VGA_MIS_ENB_MEM_ACCESS 0x02
	#define VGA_MIS_DCLK_28322_720 0x04
	#define VGA_MIS_ENB_PLL_LOAD (0x04 \| 0x08)
	#define VGA_MIS_SEL_HIGH_PAGE 0x20

	/* VGA CRT controller register indices */
	#define VGA_CRTC_H_TOTAL 0
	#define VGA_CRTC_H_DISP 1
	#define VGA_CRTC_H_BLANK_START 2
	#define VGA_CRTC_H_BLANK_END 3
	#define VGA_CRTC_H_SYNC_START 4
	#define VGA_CRTC_H_SYNC_END 5
	#define VGA_CRTC_V_TOTAL 6
	#define VGA_CRTC_OVERFLOW 7
	#define VGA_CRTC_PRESET_ROW 8
	#define VGA_CRTC_MAX_SCAN 9
	#define VGA_CRTC_CURSOR_START 0x0A
	#define VGA_CRTC_CURSOR_END 0x0B
	#define VGA_CRTC_START_HI 0x0C
	#define VGA_CRTC_START_LO 0x0D
	#define VGA_CRTC_CURSOR_HI 0x0E
	#define VGA_CRTC_CURSOR_LO 0x0F
	#define VGA_CRTC_V_SYNC_START 0x10
	#define VGA_CRTC_V_SYNC_END 0x11
	#define VGA_CRTC_V_DISP_END 0x12
	#define VGA_CRTC_OFFSET 0x13
	#define VGA_CRTC_UNDERLINE 0x14
	#define VGA_CRTC_V_BLANK_START 0x15
	#define VGA_CRTC_V_BLANK_END 0x16
	#define VGA_CRTC_MODE 0x17
	#define VGA_CRTC_LINE_COMPARE 0x18
	#define VGA_CRTC_REGS VGA_CRT_C

	/* VGA CRT controller bit masks */
	#define VGA_CR11_LOCK_CR0_CR7 0x80 /* lock writes to CR0 - CR7 */
	#define VGA_CR17_H_V_SIGNALS_ENABLED 0x80

	/* VGA attribute controller register indices */
	#define VGA_ATC_PALETTE0 0x00
	#define VGA_ATC_PALETTE1 0x01
	#define VGA_ATC_PALETTE2 0x02
	#define VGA_ATC_PALETTE3 0x03
	#define VGA_ATC_PALETTE4 0x04
	#define VGA_ATC_PALETTE5 0x05
	#define VGA_ATC_PALETTE6 0x06
	#define VGA_ATC_PALETTE7 0x07
	#define VGA_ATC_PALETTE8 0x08
	#define VGA_ATC_PALETTE9 0x09
	#define VGA_ATC_PALETTEA 0x0A
	#define VGA_ATC_PALETTEB 0x0B
	#define VGA_ATC_PALETTEC 0x0C
	#define VGA_ATC_PALETTED 0x0D
	#define VGA_ATC_PALETTEE 0x0E
	#define VGA_ATC_PALETTEF 0x0F
	#define VGA_ATC_MODE 0x10
	#define VGA_ATC_OVERSCAN 0x11
	#define VGA_ATC_PLANE_ENABLE 0x12
	#define VGA_ATC_PEL 0x13
	#define VGA_ATC_COLOR_PAGE 0x14

	#define VGA_AR_ENABLE_DISPLAY 0x20

	/* VGA sequencer register indices */
	#define VGA_SEQ_RESET 0x00
	#define VGA_SEQ_CLOCK_MODE 0x01
	#define VGA_SEQ_PLANE_WRITE 0x02
	#define VGA_SEQ_CHARACTER_MAP 0x03
	#define VGA_SEQ_MEMORY_MODE 0x04

	/* VGA sequencer register bit masks */
	#define VGA_SR01_CHAR_CLK_8DOTS 0x01 /* bit 0: character clocks 8 dots wide are generated */
	#define VGA_SR01_SCREEN_OFF 0x20 /* bit 5: Screen is off */
	#define VGA_SR02_ALL_PLANES 0x0F /* bits 3-0: enable access to all planes */
	#define VGA_SR04_EXT_MEM 0x02 /* bit 1: allows complete mem access to 256K */
	#define VGA_SR04_SEQ_MODE 0x04 /* bit 2: directs system to use a sequential addressing mode */
	#define VGA_SR04_CHN_4M 0x08 /* bit 3: selects modulo 4 addressing for CPU access to display memory */

	/* VGA graphics controller register indices */
	#define VGA_GFX_SR_VALUE 0x00
	#define VGA_GFX_SR_ENABLE 0x01
	#define VGA_GFX_COMPARE_VALUE 0x02
	#define VGA_GFX_DATA_ROTATE 0x03
	#define VGA_GFX_PLANE_READ 0x04
	#define VGA_GFX_MODE 0x05
	#define VGA_GFX_MISC 0x06
	#define VGA_GFX_COMPARE_MASK 0x07
	#define VGA_GFX_BIT_MASK 0x08

	/* VGA graphics controller bit masks */
	#define VGA_GR06_GRAPHICS_MODE 0x01

	/* macro for composing an 8-bit VGA register index and value
	* into a single 16-bit quantity */
	#define VGA_OUT16VAL(v, r) (((v) << 8) \| (r))

	/* decide whether we should enable the faster 16-bit VGA register writes */
	#ifdef __LITTLE_ENDIAN
	#define VGA_OUTW_WRITE
	#endif

	/* VGA State Save and Restore */
	#define VGA_SAVE_FONT0 1 /* save/restore plane 2 fonts */
	#define VGA_SAVE_FONT1 2 /* save/restore plane 3 fonts */
	#define VGA_SAVE_TEXT 4 /* save/restore plane 0/1 fonts */
	#define VGA_SAVE_FONTS 7 /* save/restore all fonts */
	#define VGA_SAVE_MODE 8 /* save/restore video mode */
	#define VGA_SAVE_CMAP 16 /* save/restore color map/DAC */

	struct vgastate {
	void __iomem vgabase; / mmio base, if supported */
	unsigned long membase; /* VGA window base, 0 for default - 0xA000 */
	__u32 memsize; /* VGA window size, 0 for default 64K */
	__u32 flags; /* what state[s] to save (see VGA_SAVE_) /
	__u32 depth; /* current fb depth, not important */
	__u32 num_attr; /* number of att registers, 0 for default */
	__u32 num_crtc; /* number of crt registers, 0 for default */
	__u32 num_gfx; /* number of gfx registers, 0 for default */
	__u32 num_seq; /* number of seq registers, 0 for default */
	void *vidstate;
	};

	extern int save_vga(struct vgastate *state);
	extern int restore_vga(struct vgastate *state);

	/*
	* generic VGA port read/write
	*/

	static inline unsigned char vga_io_r (unsigned short port)
	{
	return inb_p(port);
	}

	static inline void vga_io_w (unsigned short port, unsigned char val)
	{
	outb_p(val, port);
	}

	static inline void vga_io_w_fast (unsigned short port, unsigned char reg,
	unsigned char val)
	{
	outw(VGA_OUT16VAL (val, reg), port);
	}

	static inline unsigned char vga_mm_r (void __iomem *regbase, unsigned short port)
	{
	return readb (regbase + port);
	}

	static inline void vga_mm_w (void __iomem *regbase, unsigned short port, unsigned char val)
	{
	writeb (val, regbase + port);
	}

	static inline void vga_mm_w_fast (void __iomem *regbase, unsigned short port,
	unsigned char reg, unsigned char val)
	{
	writew (VGA_OUT16VAL (val, reg), regbase + port);
	}

	static inline unsigned char vga_r (void __iomem *regbase, unsigned short port)
	{
	if (regbase)
	return vga_mm_r (regbase, port);
	else
	return vga_io_r (port);
	}

	static inline void vga_w (void __iomem *regbase, unsigned short port, unsigned char val)
	{
	if (regbase)
	vga_mm_w (regbase, port, val);
	else
	vga_io_w (port, val);
	}


	static inline void vga_w_fast (void __iomem *regbase, unsigned short port,
	unsigned char reg, unsigned char val)
	{
	if (regbase)
	vga_mm_w_fast (regbase, port, reg, val);
	else
	vga_io_w_fast (port, reg, val);
	}


	/*
	* VGA CRTC register read/write
	*/

	static inline unsigned char vga_rcrt (void __iomem *regbase, unsigned char reg)
	{
	vga_w (regbase, VGA_CRT_IC, reg);
	return vga_r (regbase, VGA_CRT_DC);
	}

	static inline void vga_wcrt (void __iomem *regbase, unsigned char reg, unsigned char val)
	{
	#ifdef VGA_OUTW_WRITE
	vga_w_fast (regbase, VGA_CRT_IC, reg, val);
	#else
	vga_w (regbase, VGA_CRT_IC, reg);
	vga_w (regbase, VGA_CRT_DC, val);
	#endif /* VGA_OUTW_WRITE */
	}

	static inline unsigned char vga_io_rcrt (unsigned char reg)
	{
	vga_io_w (VGA_CRT_IC, reg);
	return vga_io_r (VGA_CRT_DC);
	}

	static inline void vga_io_wcrt (unsigned char reg, unsigned char val)
	{
	#ifdef VGA_OUTW_WRITE
	vga_io_w_fast (VGA_CRT_IC, reg, val);
	#else
	vga_io_w (VGA_CRT_IC, reg);
	vga_io_w (VGA_CRT_DC, val);
	#endif /* VGA_OUTW_WRITE */
	}

	static inline unsigned char vga_mm_rcrt (void __iomem *regbase, unsigned char reg)
	{
	vga_mm_w (regbase, VGA_CRT_IC, reg);
	return vga_mm_r (regbase, VGA_CRT_DC);
	}

	static inline void vga_mm_wcrt (void __iomem *regbase, unsigned char reg, unsigned char val)
	{
	#ifdef VGA_OUTW_WRITE
	vga_mm_w_fast (regbase, VGA_CRT_IC, reg, val);
	#else
	vga_mm_w (regbase, VGA_CRT_IC, reg);
	vga_mm_w (regbase, VGA_CRT_DC, val);
	#endif /* VGA_OUTW_WRITE */
	}


	/*
	* VGA sequencer register read/write
	*/

	static inline unsigned char vga_rseq (void __iomem *regbase, unsigned char reg)
	{
	vga_w (regbase, VGA_SEQ_I, reg);
	return vga_r (regbase, VGA_SEQ_D);
	}

	static inline void vga_wseq (void __iomem *regbase, unsigned char reg, unsigned char val)
	{
	#ifdef VGA_OUTW_WRITE
	vga_w_fast (regbase, VGA_SEQ_I, reg, val);
	#else
	vga_w (regbase, VGA_SEQ_I, reg);
	vga_w (regbase, VGA_SEQ_D, val);
	#endif /* VGA_OUTW_WRITE */
	}

	static inline unsigned char vga_io_rseq (unsigned char reg)
	{
	vga_io_w (VGA_SEQ_I, reg);
	return vga_io_r (VGA_SEQ_D);
	}

	static inline void vga_io_wseq (unsigned char reg, unsigned char val)
	{
	#ifdef VGA_OUTW_WRITE
	vga_io_w_fast (VGA_SEQ_I, reg, val);
	#else
	vga_io_w (VGA_SEQ_I, reg);
	vga_io_w (VGA_SEQ_D, val);
	#endif /* VGA_OUTW_WRITE */
	}

	static inline unsigned char vga_mm_rseq (void __iomem *regbase, unsigned char reg)
	{
	vga_mm_w (regbase, VGA_SEQ_I, reg);
	return vga_mm_r (regbase, VGA_SEQ_D);
	}

	static inline void vga_mm_wseq (void __iomem *regbase, unsigned char reg, unsigned char val)
	{
	#ifdef VGA_OUTW_WRITE
	vga_mm_w_fast (regbase, VGA_SEQ_I, reg, val);
	#else
	vga_mm_w (regbase, VGA_SEQ_I, reg);
	vga_mm_w (regbase, VGA_SEQ_D, val);
	#endif /* VGA_OUTW_WRITE */
	}

	/*
	* VGA graphics controller register read/write
	*/

	static inline unsigned char vga_rgfx (void __iomem *regbase, unsigned char reg)
	{
	vga_w (regbase, VGA_GFX_I, reg);
	return vga_r (regbase, VGA_GFX_D);
	}

	static inline void vga_wgfx (void __iomem *regbase, unsigned char reg, unsigned char val)
	{
	#ifdef VGA_OUTW_WRITE
	vga_w_fast (regbase, VGA_GFX_I, reg, val);
	#else
	vga_w (regbase, VGA_GFX_I, reg);
	vga_w (regbase, VGA_GFX_D, val);
	#endif /* VGA_OUTW_WRITE */
	}

	static inline unsigned char vga_io_rgfx (unsigned char reg)
	{
	vga_io_w (VGA_GFX_I, reg);
	return vga_io_r (VGA_GFX_D);
	}

	static inline void vga_io_wgfx (unsigned char reg, unsigned char val)
	{
	#ifdef VGA_OUTW_WRITE
	vga_io_w_fast (VGA_GFX_I, reg, val);
	#else
	vga_io_w (VGA_GFX_I, reg);
	vga_io_w (VGA_GFX_D, val);
	#endif /* VGA_OUTW_WRITE */
	}

	static inline unsigned char vga_mm_rgfx (void __iomem *regbase, unsigned char reg)
	{
	vga_mm_w (regbase, VGA_GFX_I, reg);
	return vga_mm_r (regbase, VGA_GFX_D);
	}

	static inline void vga_mm_wgfx (void __iomem *regbase, unsigned char reg, unsigned char val)
	{
	#ifdef VGA_OUTW_WRITE
	vga_mm_w_fast (regbase, VGA_GFX_I, reg, val);
	#else
	vga_mm_w (regbase, VGA_GFX_I, reg);
	vga_mm_w (regbase, VGA_GFX_D, val);
	#endif /* VGA_OUTW_WRITE */
	}


	/*
	* VGA attribute controller register read/write
	*/

	static inline unsigned char vga_rattr (void __iomem *regbase, unsigned char reg)
	{
	vga_w (regbase, VGA_ATT_IW, reg);
	return vga_r (regbase, VGA_ATT_R);
	}

	static inline void vga_wattr (void __iomem *regbase, unsigned char reg, unsigned char val)
	{
	vga_w (regbase, VGA_ATT_IW, reg);
	vga_w (regbase, VGA_ATT_W, val);
	}

	static inline unsigned char vga_io_rattr (unsigned char reg)
	{
	vga_io_w (VGA_ATT_IW, reg);
	return vga_io_r (VGA_ATT_R);
	}

	static inline void vga_io_wattr (unsigned char reg, unsigned char val)
	{
	vga_io_w (VGA_ATT_IW, reg);
	vga_io_w (VGA_ATT_W, val);
	}

	static inline unsigned char vga_mm_rattr (void __iomem *regbase, unsigned char reg)
	{
	vga_mm_w (regbase, VGA_ATT_IW, reg);
	return vga_mm_r (regbase, VGA_ATT_R);
	}

	static inline void vga_mm_wattr (void __iomem *regbase, unsigned char reg, unsigned char val)
	{
	vga_mm_w (regbase, VGA_ATT_IW, reg);
	vga_mm_w (regbase, VGA_ATT_W, val);
	}

	#endif /* __linux_video_vga_h__ */