vgamach64xx.c

这是一个同样来自贝尔实验室的和UNIX有着渊源的操作系统, 其简洁的设计和实现易于我们学习和理解

#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "io.h"
#include "../port/error.h"

#define	Image	IMAGE
#include <draw.h>
#include <memdraw.h>
#include <cursor.h>
#include "screen.h"

char Eunsupportedformat[] = "unsupported video format";
char Enotconfigured[] = "device not configured";

#define SCALE_ZERO_EXTEND           	0x0
#define SCALE_DYNAMIC               		0x1
#define SCALE_RED_TEMP_6500K        	0x0
#define SCALE_RED_TEMP_9800K        	0x2
#define SCALE_HORZ_BLEND            	0x0
#define SCALE_HORZ_REP              		0x4
#define SCALE_VERT_BLEND            		0x0
#define SCALE_VERT_REP              		0x8
#define SCALE_BANDWIDTH_NORMAL     0x0
#define SCALE_BANDWIDTH_EXCEEDED  0x4000000
#define SCALE_BANDWIDTH_RESET       	0x4000000
#define SCALE_CLK_ACTIVITY          	0x0
#define SCALE_CLK_CONTINUOUS        	0x20000000
#define OVERLAY_DISABLE             		0x0
#define OVERLAY_ENABLE              		0x40000000
#define SCALE_DISABLE               		0x0
#define SCALE_ENABLE                		0x80000000

#define SCALER_FRAME_READ_MODE_FULL 	0x0
#define SCALER_BUF_MODE_SINGLE      		0x0
#define SCALER_BUF_MODE_DOUBLE      		0x40000
#define SCALER_BUF_NEXT_0           		0x0
#define SCALER_BUF_NEXT_1           		0x80000
#define SCALER_BUF_STATUS_0         		0x0
#define SCALER_BUF_STATUS_1         		0x100000

#define OVERLAY_MIX_G_CMP           		0x0
#define OVERLAY_MIX_ALWAYS_G        		0x100
#define OVERLAY_MIX_ALWAYS_V        		0x200
#define OVERLAY_MIX_NOT_G           		0x300
#define OVERLAY_MIX_NOT_V           		0x400
#define OVERLAY_MIX_G_XOR_V         		0x500
#define OVERLAY_MIX_NOT_G_XOR_V     	0x600
#define OVERLAY_MIX_V_CMP           		0x700
#define OVERLAY_MIX_NOT_G_OR_NOT_V	0x800
#define OVERLAY_MIX_G_OR_NOT_V      	0x900
#define OVERLAY_MIX_NOT_G_OR_V      	0xA00
#define OVERLAY_MIX_G_OR_V          		0xB00
#define OVERLAY_MIX_G_AND_V         		0xC00
#define OVERLAY_MIX_NOT_G_AND_V     	0xD00
#define OVERLAY_MIX_G_AND_NOT_V     	0xE00
#define OVERLAY_MIX_NOT_G_AND_NOT_V 	0xF00
#define OVERLAY_EXCLUSIVE_NORMAL    	0x0
#define OVERLAY_EXCLUSIVE_V_ONLY    	0x80000000

#define VIDEO_IN_8BPP               			0x2
#define VIDEO_IN_16BPP              			0x4
#define VIDEO_IN_32BPP              			0x6
#define VIDEO_IN_VYUY422            			0xB         		/*16 bpp */
#define VIDEO_IN_YVYU422            			0xC         		/* 16 bpp */
#define SCALE_IN_15BPP              			0x30000     	/* aRGB 1555 */
#define SCALE_IN_16BPP              			0x40000     	/* RGB 565 */
#define SCALE_IN_32BPP              			0x60000     	/* aRGB 8888 */
#define SCALE_IN_YUV9               			0x90000     	/* planar */
#define SCALE_IN_YUV12              			0xA0000     	/* planar */
#define SCALE_IN_VYUY422            			0xB0000     	/* 16 bpp */
#define SCALE_IN_YVYU422            			0xC0000     	/* 16 bpp */
#define HOST_YUV_APERTURE_UPPER     		0x0
#define HOST_YUV_APERTURE_LOWER     	0x20000000
#define HOST_MEM_MODE_Y             		0x40000000
#define HOST_MEM_MODE_U             		0x80000000
#define HOST_MEM_MODE_V             		0xC0000000
#define HOST_MEM_MODE_NORMAL     		HOST_YUV_APERTURE_UPPER 

static Chan *ovl_chan;	/* Channel of controlling process */
static int ovl_width;		/* Width of input overlay buffer */
static int ovl_height;		/* Height of input overlay buffer */
static int ovl_format;	/* Overlay format */
static ulong ovl_fib;		/* Frame in bytes */

enum {
	 VTGTB1S1        = 0x01,            //  Asic description for VTB1S1 and GTB1S1.
	 VT4GTIIC        	= 0x3A,            // asic descr for VT4 and RAGE IIC
	 GTB1U1          	= 0x19,            //  Asic description for GTB1U1.
	 GTB1S2          	= 0x41,            //  Asic description for GTB1S2.
	 GTB2U1          	= 0x1A,
	 GTB2U2          	= 0x5A,
	 GTB2U3          	= 0x9A,
	 GTIIIC1U1       	= 0x1B,            // 3D RAGE PRO asic descrp.
	 GTIIIC1U2       	= 0x5B,            // 3D RAGE PRO asic descrp.
	 GTIIIC2U1       	= 0x1C,            // 3D RAGE PRO asic descrp.
	 GTIIIC2U2       	= 0x5C,           // 3D RAGE PRO asic descrp.
	 GTIIIC2U3       	= 0x7C,            // 3D RAGE PRO asic descrp.
	 GTBC            	= 0x3A,            // 3D RAGE IIC asic descrp.
	 LTPRO           	= 0x9C,            // 3D RAGE LT PRO
};

/*
 * ATI Mach64(CT|ET|G*|V*|L*).
 */
typedef struct Mach64types Mach64types;
struct Mach64types {
	ushort 	m64_id;			/* Chip ID */
	int 		m64_vtgt;		/* Is this a VT or GT chipset? */
	ulong	m64_ovlclock;		/* Max. overlay clock frequency */
	int		m64_pro;			/* Is this a PRO? */
};

static ulong mach64refclock;
static Mach64types *mach64type;
static int mach64revb;			/* Revision B or greater? */
static ulong mach64overlay;		/* Overlay buffer */

static Mach64types mach64s[] = {
	('C'<<8)|'T',	0,	1350000, /*?*/	0,	/* 4354: CT */
	('E'<<8)|'T',	0,	1350000, /*?*/	0,	/* 4554: ET */
	('G'<<8)|'B',	1,	1250000,		1, 	/* 4742: 264GT PRO */
	('G'<<8)|'D',	1,	1250000,		1, 	/* 4744: 264GT PRO */
	('G'<<8)|'I',	1,	1250000,		1, 	/* 4749: 264GT PRO */
	('G'<<8)|'M',	0,	1350000,		0,	/* 474D: Rage XL */
	('G'<<8)|'P',	1,	1250000,		1, 	/* 4750: 264GT PRO */
	('G'<<8)|'Q',	1,	1250000,		1,	/* 4751: 264GT PRO */
	('G'<<8)|'R',	1,	1250000,		1,	/* 4752: */
	('G'<<8)|'T',	1,	800000,		0,	/* 4754: 264GT[B] */
	('G'<<8)|'U',	1,	1000000,		0,	/* 4755: 264GT DVD */
	('G'<<8)|'V',	1,	1000000,		0,	/* 4756: Rage2C */
	('G'<<8)|'Z',	1,	1000000,		0,	/* 475A: Rage2C */
	('V'<<8)|'T',	1,	800000,		0,	/* 5654: 264VT/GT/VTB */
	('V'<<8)|'U',	1,	800000,		0,	/* 5655: 264VT3 */
	('V'<<8)|'V',	1,	1000000,		0,	/* 5656: 264VT4 */
	('L'<<8)|'B',	0,	1350000,		1,	/* 4C42: Rage LTPro AGP */
	('L'<<8)|'I',		0,	1350000,		0,	/* 4C49: Rage LTPro AGP */
	('L'<<8)|'M',	0,	1350000,		0,	/* 4C4D: Rage Mobility */
	('L'<<8)|'P',	0,	1350000,		1,	/* 4C50: 264LT PRO */
};


static int hwfill(VGAscr*, Rectangle, ulong);
static int hwscroll(VGAscr*, Rectangle, Rectangle);
static void initengine(VGAscr*);

static Pcidev*
mach64xxpci(void)
{
	Pcidev *p;
	int i;

	if((p = pcimatch(nil, 0x1002, 0)) == nil)
		return nil;

	for (i = 0; i != nelem(mach64s); i++)
		if (mach64s[i].m64_id == p->did) {
			mach64type = &mach64s[i];
			return p;
		}
	return nil;
}

static void
mach64xxenable(VGAscr* scr)
{
	Pcidev *p;

	if(scr->io)
		return;
	if(p = mach64xxpci()){
		scr->id = p->did;
		scr->pci = p;

		/*
		 * The CT doesn't always have the I/O base address
		 * in the PCI base registers. There is a way to find
		 * it via the vendor-specific PCI config space but
		 * this will do for now.
		 */
		scr->io = p->mem[1].bar & ~0x03;

		if(scr->io == 0)
			scr->io = 0x2EC;
	}
}

static void
mach64xxlinear(VGAscr* scr, int size, int)
{
	vgalinearpci(scr);
	if(scr->paddr == 0)
		return;
	scr->mmio = (ulong*)((uchar*)scr->vaddr+size-1024);
	addvgaseg("mach64mmio", scr->paddr+size-BY2PG, BY2PG);
	addvgaseg("mach64screen", scr->paddr, scr->apsize);
}

enum {
	CrtcOffPitch	= 0x05,
	CrtcGenCtl	= 0x07,
	CurClr0		= 0x0B,		/* I/O Select */
	CurClr1		= 0x0C,
	CurOffset	= 0x0D,
	CurHVposn	= 0x0E,
	CurHVoff	= 0x0F,
	BusCntl	= 0x13,
	GenTestCntl	= 0x19,

	CrtcHsyncDis	= 0x04,
	CrtcVsyncDis	= 0x08,

	ContextMask	= 0x100,	/* not accessible via I/O */
	FifoStat,
	GuiStat,
	DpFrgdClr,
	DpBkgdClr,
	DpWriteMask,
	DpMix,
	DpPixWidth,
	DpSrc,
	ClrCmpCntl,
	GuiTrajCntl,
	ScLeftRight,
	ScTopBottom,
	DstOffPitch,
	DstYX,
	DstHeightWidth,
	DstCntl,
	DstHeight,
	DstBresErr,
	DstBresInc,
	DstBresDec,
	SrcCntl,
	SrcHeight1Width1,
	SrcHeight2Width2,
	SrcYX,
	SrcWidth1,
	SrcYXstart,
	HostCntl,
	PatReg0,
	PatReg1,
	PatCntl,
	ScBottom,
	ScLeft,
	ScRight,
	ScTop,
	ClrCmpClr,
	ClrCmpMask,
	DpChainMask,
	SrcOffPitch,	
	LcdIndex,
	LcdData,
	ClockCntl,
	OverlayScaleCntl,
	ConfigChipId,
	Buf0Pitch,
	ScalerBuf0Pitch,
	CaptureConfig,
	OverlayKeyCntl,
	ScalerColourCntl,
	ScalerHCoef0,
	ScalerHCoef1,
	ScalerHCoef2,
	ScalerHCoef3,
	ScalerHCoef4,
	VideoFormat,
	Buf0Offset,
	ScalerBuf0Offset,
	CrtcGenCntl,
	OverlayScaleInc,
	OverlayYX,
	OverlayYXEnd,
	ScalerHeightWidth,
	HTotalDisp,
	VTotalDisp,
};

enum {
	LCD_ConfigPanel = 0,
	LCD_GenCtrl,
	LCD_DstnCntl,
	LCD_HfbPitchAddr,
	LCD_HorzStretch,
	LCD_VertStretch,
	LCD_ExtVertStretch,
	LCD_LtGio,
	LCD_PowerMngmnt,
	LCD_ZvgPio,
	Nlcd,
};

#define Bank1			(-0x100)		/* 1KB */

static int mmoffset[] = {
	[HTotalDisp]		0x00,
	[VTotalDisp]		0x02,
	[CrtcOffPitch]		0x05,
	[CrtcGenCntl]		0x07,
	[CurClr0]			0x18,
	[CurClr1]			0x19,
	[CurOffset]		0x1A,
	[CurHVposn]		0x1B,
	[CurHVoff]		0x1C,
	[ClockCntl]		0x24,
	[BusCntl]			0x28,
	[LcdIndex]		0x29,
	[LcdData]			0x2A,
	[GenTestCntl]		0x34,
	[ConfigChipId]		0x38,
	[DstOffPitch]		0x40,
	[DstYX]			0x43,
	[DstHeight]		0x45,
	[DstHeightWidth]	0x46,
	[DstBresErr]		0x49,
	[DstBresInc]		0x4A,
	[DstBresDec]		0x4B,
	[DstCntl]			0x4C,
	[SrcOffPitch]		0x60,
	[SrcYX]			0x63,
	[SrcWidth1]		0x64,
	[SrcYXstart]		0x69,
	[SrcHeight1Width1]	0x66,
	[SrcHeight2Width2]	0x6C,
	[SrcCntl]			0x6D,
	[HostCntl]			0x90,
	[PatReg0]			0xA0,
	[PatReg1]			0xA1,
	[PatCntl]			0xA2,
	[ScLeft]			0xA8,
	[ScRight]			0xA9,
	[ScLeftRight]		0xAA,
	[ScTop]			0xAB,
	[ScBottom] 		0xAC,
	[ScTopBottom]		0xAD,
	[DpBkgdClr]		0xB0,
	[DpFrgdClr]		0xB1,
	[DpWriteMask]		0xB2,
	[DpChainMask]		0xB3,
	[DpPixWidth]		0xB4,
	[DpMix]			0xB5,
	[DpSrc]			0xB6,
	[ClrCmpClr]		0xC0,
	[ClrCmpMask]		0xC1,
	[ClrCmpCntl]		0xC2,
	[FifoStat]			0xC4,
	[ContextMask]		0xC8,
	[GuiTrajCntl]		0xCC,
	[GuiStat]			0xCE,

	/* Bank1 */
	[OverlayYX]		Bank1 + 0x00,
	[OverlayYXEnd]		Bank1 + 0x01,
	[OverlayKeyCntl]	Bank1 + 0x06,
	[OverlayScaleInc]	Bank1 + 0x08,
	[OverlayScaleCntl]	Bank1 + 0x09,
	[ScalerHeightWidth]	Bank1 + 0x0A,
	[ScalerBuf0Offset]	Bank1 + 0x0D,
	[ScalerBuf0Pitch]	Bank1 + 0x0F,
	[VideoFormat]		Bank1 + 0x12,
	[CaptureConfig]	Bank1 + 0x14,
	[Buf0Offset]		Bank1 + 0x20,
	[Buf0Pitch]		Bank1 + 0x23,
	[ScalerColourCntl]	Bank1 + 0x54,
	[ScalerHCoef0]		Bank1 + 0x55,
	[ScalerHCoef1]		Bank1 + 0x56,
	[ScalerHCoef2]		Bank1 + 0x57,
	[ScalerHCoef3]		Bank1 + 0x58,
	[ScalerHCoef4]		Bank1 + 0x59,
};

static ulong
ior32(VGAscr* scr, int r)
{
	if(scr->io == 0x2EC || scr->io == 0x1C8)
		return inl((r<<10)+scr->io);
	if(r >= 0x100 && scr->mmio != nil)
		return scr->mmio[mmoffset[r]];
	return inl((mmoffset[r]<<2)+scr->io);
}

static void
iow32(VGAscr* scr, int r, ulong l)
{
	if(scr->io == 0x2EC || scr->io == 0x1C8)
		outl(((r)<<10)+scr->io, l);
	else if(r >= 0x100 && scr->mmio != nil)
		scr->mmio[mmoffset[r]] = l;
	else
		outl((mmoffset[r]<<2)+scr->io, l);
}

static ulong
lcdr32(VGAscr *scr, ulong r)
{
	ulong or;

	or = ior32(scr, LcdIndex);
	iow32(scr, LcdIndex, (or&~0x0F) | (r&0x0F));
	return ior32(scr, LcdData);
}

static void
lcdw32(VGAscr *scr, ulong r, ulong v)
{
	ulong or;

	or = ior32(scr, LcdIndex);
	iow32(scr, LcdIndex, (or&~0x0F) | (r&0x0F));
	iow32(scr, LcdData, v);
}

static void
mach64xxcurdisable(VGAscr* scr)
{
	ulong r;

	r = ior32(scr, GenTestCntl);
	iow32(scr, GenTestCntl, r & ~0x80);
}

static void
mach64xxcurload(VGAscr* scr, Cursor* curs)
{
	uchar *p;
	int i, y;
	ulong c, s, m, r;

	/*
	 * Disable the cursor.
	 */
	r = ior32(scr, GenTestCntl);
	iow32(scr, GenTestCntl, r & ~0x80);

	p = scr->vaddr;
	p += scr->storage;

	/*
	 * Initialise the 64x64 cursor RAM array.
	 * The cursor mode gives the following truth table:
	 *	p1 p0	colour
	 *	 0  0	Cursor Colour 0
	 *	 0  1	Cursor Colour 1
	 *	 1  0	Transparent
	 *	 1  1	Complement
	 * Put the cursor into the top-right of the 64x64 array.
	 */
	for(y = 0; y < 16; y++){
		for(i = 0; i < (64-16)/8; i++){
			*p++ = 0xAA;
			*p++ = 0xAA;
		}

		c = (curs->clr[2*y]<<8)|curs->clr[y*2 + 1];
		s = (curs->set[2*y]<<8)|curs->set[y*2 + 1];

		m = 0x00000000;
		for(i = 0; i < 16; i++){
			if(s & (1<<(15-i)))
				m |= 0x01<<(2*i);
			else if(c & (1<<(15-i))){
				/* nothing to do */
			}
			else
				m |= 0x02<<(2*i);
		}
		*p++ = m;
		*p++ = m>>8;
		*p++ = m>>16;
		*p++ = m>>24;
	}
	memset(p, 0xAA, (64-16)*16);

	/*
	 * Set the cursor hotpoint and enable the cursor.
	 */
	scr->offset = curs->offset;
	iow32(scr, GenTestCntl, 0x80|r);
}

static int
ptalmostinrect(Point p, Rectangle r)
{
	return p.x>=r.min.x && p.x<=r.max.x &&
	       p.y>=r.min.y && p.y<=r.max.y;
}

/*
 * If necessary, translate the rectangle physr
 * some multiple of [dx dy] so that it includes p.
 * Return 1 if the rectangle changed.
 */
static int
screenpan(Point p, Rectangle *physr, int dx, int dy)
{
	int d;

	if(ptalmostinrect(p, *physr))
		return 0;

	if(p.y < physr->min.y){
		d = physr->min.y - (p.y&~(dy-1));
		physr->min.y -= d;
		physr->max.y -= d;
	}
	if(p.y > physr->max.y){
		d = ((p.y+dy-1)&~(dy-1)) - physr->max.y;
		physr->min.y += d;
		physr->max.y += d;
	}

	if(p.x < physr->min.x){
		d = physr->min.x - (p.x&~(dx-1));
		physr->min.x -= d;
		physr->max.x -= d;
	}
	if(p.x > physr->max.x){
		d = ((p.x+dx-1)&~(dx-1)) - physr->max.x;
		physr->min.x += d;
		physr->max.x += d;
	}
	return 1;
}

static int
mach64xxcurmove(VGAscr* scr, Point p)
{
	int x, xo, y, yo;
	int dx;
	ulong off, pitch;

	/*
	 * If the point we want to display is outside the current
	 * screen rectangle, pan the screen to display it.
	 *
	 * We have to move in 64-bit chunks.
	 */
	if(scr->gscreen->depth == 24)
		dx = (64*3)/24;
	else
		dx = 64 / scr->gscreen->depth;

	if(panning && screenpan(p, &physgscreenr, dx, 1)){
		off = (physgscreenr.min.y*Dx(scr->gscreen->r)+physgscreenr.min.x)/dx;
		pitch = Dx(scr->gscreen->r)/8;
		iow32(scr, CrtcOffPitch, (pitch<<22)|off);
	}

	p.x -= physgscreenr.min.x;
	p.y -= physgscreenr.min.y;

	/*
	 * Mustn't position the cursor offscreen even partially,
	 * or it disappears. Therefore, if x or y is -ve, adjust the
	 * cursor presets instead. If y is negative also have to
	 * adjust the starting offset.
	 */
	if((x = p.x+scr->offset.x) < 0){
		xo = x;
		x = 0;
	}
	else
		xo = 0;
	if((y = p.y+scr->offset.y) < 0){
		yo = y;
		y = 0;
	}
	else
		yo = 0;

	iow32(scr, CurHVoff, ((64-16-yo)<<16)|(64-16-xo));
	iow32(scr, CurOffset, scr->storage/8 + (-yo*2));
	iow32(scr, CurHVposn, (y<<16)|x);

	return 0;
}

static void
mach64xxcurenable(VGAscr* scr)
{
	ulong r, storage;

	mach64xxenable(scr);
	if(scr->io == 0)
		return;

	r = ior32(scr, GenTestCntl);
	iow32(scr, GenTestCntl, r & ~0x80);

	iow32(scr, CurClr0, (Pwhite<<24)|(Pwhite<<16)|(Pwhite<<8)|Pwhite);
	iow32(scr, CurClr1, (Pblack<<24)|(Pblack<<16)|(Pblack<<8)|Pblack);

	/*
	 * Find a place for the cursor data in display memory.
	 * Must be 64-bit aligned.
	 */
	storage = (scr->gscreen->width*BY2WD*scr->gscreen->r.max.y+7)/8;
	iow32(scr, CurOffset, storage);
	scr->storage = storage*8;

	/*
	 * Cursor goes in the top right corner of the 64x64 array
	 * so the horizontal and vertical presets are 64-16.
	 */