ref: 8294be6e7c9032e3c472018b53154d5b4faec00c
dir: /os/pc/vgasavage.c/
#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"
enum {
PCIS3 = 0x5333, /* PCI VID */
SAVAGE3D = 0x8A20, /* PCI DID */
SAVAGE3DMV = 0x8A21,
SAVAGE4 = 0x8A22,
PROSAVAGEP = 0x8A25,
PROSAVAGEK = 0x8A26,
PROSAVAGE8 = 0x8D04,
SAVAGEMXMV = 0x8C10,
SAVAGEMX = 0x8C11,
SAVAGEIXMV = 0x8C12,
SAVAGEIX = 0x8C13,
SUPERSAVAGEIXC16 = 0x8C2E,
SAVAGE2000 = 0x9102,
VIRGE = 0x5631,
VIRGEGX2 = 0x8A10,
VIRGEDXGX = 0x8A01,
VIRGEVX = 0x883D,
VIRGEMX = 0x8C01,
VIRGEMXP = 0x8C03,
AURORA64VPLUS = 0x8812,
};
/*
* Savage4 et al. acceleration.
*
* This is based only on the Savage4 documentation.
* It is expected to work on other Savage cards as well,
* but has not been tried.
*
* There are five ways to access the 2D graphics engine registers:
* - Old MMIO non-packed format
* - Old MMIO packed format
* - New MMIO non-packed format
* - New MMIO packed format
* - Burst Command Interface (BCI)
*
* Of these, the manual hints that the first three are deprecated,
* and it does not document any of those three well enough to use.
*
* I have tried for many hours with no success to understand the BCI
* interface well enough to use it. It is not well documented, and the
* XFree86 driver seems to completely contradict what little documentation
* there is.
*
* This leaves the packed new MMIO.
* The manual contradicts itself here, claming that the registers
* start at 0x2008100 as well as at 0x0008100 from the base of the
* mmio segment. Since the segment is only 512k, we assume that
* the latter is the correct offset.
*
* According to the manual, only 16-bit reads of the 2D registers
* are supported: 32-bit reads will return garbage in the upper word.
* 32-bit writes must be enabled explicitly.
*
* 32-bit reads of the status registers seem just fine.
*/
/* 2D graphics engine registers for Savage4; others appear to be mostly the same */
enum {
SubsystemStatus = 0x8504, /* Subsystem Status: read only */
/* read only: whether we get interrupts on various events */
VsyncInt = 1<<0, /* vertical sync */
GeBusyInt = 1<<1, /* 2D graphics engine busy */
BfifoFullInt = 1<<2, /* BIU FIFO full */
BfifoEmptyInt = 1<<3, /* BIU FIFO empty */
CfifoFullInt = 1<<4, /* command FIFO full */
CfifoEmptyInt = 1<<5, /* command FIFO empty */
BciInt = 1<<6, /* BCI */
LpbInt = 1<<7, /* LPB */
CbHiInt = 1<<16, /* COB upper threshold */
CbLoInt = 1<<17, /* COB lower threshold */
SubsystemCtl = 0x8504, /* Subsystem Control: write only */
/* clear interrupts for various events */
VsyncClr = 1<<0,
GeBusyClr = 1<<1,
BfifoFullClr = 1<<2,
BfifoEmptyClr = 1<<3,
CfifoFullClr = 1<<4,
CfifoEmptyClr = 1<<5,
BciClr = 1<<6,
LpbClr = 1<<7,
CbHiClr = 1<<16,
CbLoClr = 1<<17,
/* enable interrupts for various events */
VsyncEna = 1<<8,
Busy2DEna = 1<<9,
BfifoFullEna = 1<<10,
BfifoEmptyEna = 1<<11,
CfifoFullEna = 1<<12,
CfifoEmptyEna = 1<<13,
SubsysBciEna = 1<<14,
CbHiEna = 1<<24,
CbLoEna = 1<<25,
/* 2D graphics engine software reset */
GeSoftReset = 1<<15,
FifoStatus = 0x8508, /* FIFO status: read only */
CwbEmpty = 1<<0, /* command write buffer empty */
CrbEmpty = 1<<1, /* command read buffer empty */
CobEmpty = 1<<2, /* command overflow buffer empty */
CfifoEmpty = 1<<3, /* command FIFO empty */
CwbFull = 1<<8, /* command write buffer full */
CrbFull = 1<<9, /* command read buffer full */
CobFull = 1<<10, /* command overflow buffer full */
CfifoFull = 1<<11, /* command FIFO full */
AdvFunCtl = 0x850C, /* Advanced Function Control: read/write */
GeEna = 1<<0, /* enable 2D/3D engine */
/*
* according to the manual, BigPixel should be
* set when bpp >= 8 (bpp != 4), and then CR50_5-4 are
* used to figure out bpp example. however, it does bad things
* to the screen in 8bpp mode.
*/
BigPixel = 1<<2, /* 8 or more bpp enhanced mode */
LaEna = 1<<3, /* linear addressing ena: or'ed with CR58_4 */
Mclk_2 = 0<<8, /* 2D engine clock divide: MCLK/2 */
Mclk_4 = 1<<8, /* " MCLK/4 */
Mclk = 2<<8, /* " MCLK */
/* Mclk = 3<<8, /* " MCLK */
Ic33mhz = 1<<16, /* Internal clock 33 MHz (instead of 66) */
WakeupReg = 0x8510, /* Wakeup: read/write */
WakeupBit = 1<<0, /* wake up: or'ed with 3C3_0 */
SourceY = 0x8100, /* UL corner of bitblt source */
SourceX = 0x8102, /* " */
RectY = 0x8100, /* UL corner of rectangle fill */
RectX = 0x8102, /* " */
DestY = 0x8108, /* UL corner of bitblt dest */
DestX = 0x810A, /* " */
Height = 0x8148, /* bitblt, image xfer rectangle height */
Width = 0x814A, /* bitblt, image xfer rectangle width */
StartY = 0x8100, /* Line draw: first point*/
StartX = 0x8102, /* " */
/*
* For line draws, the following must be programmed:
* axial step constant = 2*min(|dx|,|dy|)
* diagonal step constant = 2*[min(|dx|,|dy|) - max(|dx|,|dy|)]
* error term = 2*min(|dx|,|dy|) - max(|dx|,|dy| - 1
* [sic] when start X < end X
* error term = 2*min(|dx|,|dy|) - max(|dx|,|dy|
* [sic] when start X >= end X
*/
AxialStep = 0x8108,
DiagonalStep = 0x810A,
LineError = 0x8110,
MinorLength = 0x8148, /* pixel count along minor axis */
MajorLength = 0x814A, /* pixel count along major axis */
DrawCmd = 0x8118, /* Drawing Command: write only */
CmdMagic = 0<<1,
AcrossPlane = 1<<1, /* across the plane mode */
LastPixelOff = 1<<2, /* last pixel of line or vector draw not drawn */
Radial = 1<<3, /* enable radial direction (else axial) */
DoDraw = 1<<4, /* draw pixels (else only move current pos) */
DrawRight = 1<<5, /* axial drawing direction: left to right */
/* DrawLeft = 0<<5, */
MajorY = 1<<6,
/* MajorX = 0<<6, */
DrawDown = 1<<7,
/* DrawUp = 0<<7, */
Degree0 = 0<<5, /* drawing direction when Radial */
Degree45 = 1<<5,
/* ... */
Degree315 = 7<<5,
UseCPUData = 1<<8,
/* image write bus transfer width */
Bus8 = 0<<9,
Bus16 = 1<<9,
/*
* in Bus32 mode, doubleword bits beyond the image rect width are
* discarded. each line starts on a new doubleword.
* Bus32AP is intended for across-the-plane mode and
* rounds to byte boundaries instead.
*/
Bus32 = 2<<9,
Bus32AP = 3<<9,
CmdNop = 0<<13, /* nop */
CmdLine = 1<<13, /* draw line */
CmdFill = 2<<13, /* fill rectangle */
CmdBitblt = 6<<13, /* bitblt */
CmdPatblt = 7<<13, /* 8x8 pattern blt */
SrcGBD = 0<<16,
SrcPBD = 1<<16,
SrcSBD = 2<<16,
DstGBD = 0<<18,
DstPBD = 1<<18,
DstSBD = 2<<18,
/* color sources, controls */
BgColor = 0x8120, /* Background Color: read/write */
FgColor = 0x8124, /* Foreground Color: read/write */
BitplaneWmask = 0x8128, /* Bitplane Write Mask: read/write */
BitplaneRmask = 0x812C, /* Bitplane Read Mask: read/write */
CmpColor = 0x8130, /* Color Compare: read/write */
BgMix = 0x8134,
FgMix = 0x8136,
MixNew = 7,
SrcBg = 0<<5,
SrcFg = 1<<5,
SrcCPU = 2<<5,
SrcDisp = 3<<5,
/* clipping rectangle */
TopScissors = 0x8138, /* Top Scissors: write only */
LeftScissors = 0x813A, /* Left Scissors: write only */
BottomScissors = 0x813C, /* Bottom Scissors: write only */
RightScissors = 0x813E, /* Right Scissors: write only */
/*
* Registers with Magic were indirectly accessed in older modes.
* It is not clear whether the Magic is necessary.
* In the older modes, writes to these registers were pipelined,
* so that you had to issue an engine command and wait for engine
* idle before reading a write back. It is not clear if this is
* still the case either.
*/
PixCtl = 0x8140, /* Pixel Control: write only */
PixMagic = 0xA<<12,
PixMixFg = 0<<6, /* foreground mix register always */
PixMixCPU = 2<<6, /* CPU data determines mix register */
PixMixDisp = 3<<6, /* display data determines mix register */
MfMisc2Ctl = 0x8142, /* Multifunction Control Misc. 2: write only */
MfMisc2Magic = 0xD<<12,
DstShift = 0, /* 3 bits: destination base address in MB */
SrcShift = 4, /* 3 bits: source base address in MB */
WaitFifoEmpty = 2<<8, /* wait for write FIFO empty between draws */
MfMiscCtl = 0x8144, /* Multifunction Control Misc: write only */
MfMiscMagic = 0xE<<12,
UseHighBits = 1<<4, /* select upper 16 bits for 32-bit reg access */
ClipInvert = 1<<5, /* only touch pixels outside clip rectangle */
SkipSame = 0<<6, /* ignore pixels with color CmpColor */
SkipDifferent = 1<<7, /* ignore pixels not color CmpColor */
CmpEna = 1<<8, /* enable color compare */
W32Ena = 1<<9, /* enable 32-bit register write */
ClipDis = 1<<11, /* disable clipping */
/*
* The bitmap descriptor 1 registers contain the starting
* address of the bitmap (in bytes).
* The bitmap descriptor 2 registesr contain stride (in pixels)
* in the lower 16 bits, depth (in bits) in the next 8 bits,
* and whether block write is disabled.
*/
GBD1 = 0x8168, /* Global Bitmap Descriptor 1: read/write */
GBD2 = 0x816C, /* Global Bitmap Descriptor 2: read/write */
/* GBD2-only bits */
BDS64 = 1<<0, /* bitmap descriptor size 64 bits */
GBDBciEna = 1<<3, /* BCI enable */
/* generic BD2 bits */
BlockWriteDis = 1<<28,
StrideShift = 0,
DepthShift = 16,
PBD1 = 0x8170, /* Primary Bitmap Descriptor: read/write */
PBD2 = 0x8174,
SBD1 = 0x8178, /* Secondary Bitmap Descriptor: read/write */
SBD2 = 0x817C,
};
/* mastered data transfer registers */
/* configuration/status registers */
enum {
XStatus0 = 0x48C00, /* Status Word 0: read only */
/* rev. A silicon differs from rev. B; use AltStatus0 */
CBEMaskA = 0x1FFFF, /* filled command buffer entries */
CBEShiftA = 0,
BciIdleA = 1<<17, /* BCI idle */
Ge3IdleA = 1<<18, /* 3D engine idle */
Ge2IdleA = 1<<19, /* 2D engine idle */
McpIdleA = 1<<20, /* motion compensation processor idle */
MeIdleA = 1<<22, /* master engine idle */
PfPendA = 1<<23, /* page flip pending */
CBEMaskB = 0x1FFFFF,
CBEShiftB = 0,
BciIdleB = 1<<25,
Ge3IdleB = 1<<26,
Ge2IdleB = 1<<27,
McpIdleB = 1<<28,
MeIdleB = 1<<30,
PfPendB = 1<<31,
AltStatus0 = 0x48C60, /* Alternate Status Word 0: read only */
CBEMask = 0x1FFFF,
CBEShift = 0,
/* the Savage4 manual says bits 17..23 for these, like Status0 */
/* empirically, they are bits 21..26 */
BciIdle = 1<<21,
Ge3Idle = 1<<22,
Ge2Idle = 1<<23,
McpIdle = 1<<24,
MeIdle = 1<<25,
PfPend = 1<<26,
XStatus1 = 0x48C04, /* Status Word 1: read only */
/* contains event tag 1, event tag 0, both 16 bits */
XStatus2 = 0x48C08, /* Status Word 2: read only */
ScanMask = 0x3FF, /* current scan line */
ScanShift = 0,
VRTMask = 0x7F100, /* vert retrace count */
VRTShift = 11,
CbThresh = 0x48C10, /* Command Buffer Thresholds: read/write */
CobOff = 0x48C14, /* Command Overflow Buffer: read/write */
CobPtr = 0x48C18, /* Command Overflow Buffer Pointers: read/write */
CobEna = 1<<2, /* command overflow buffer enable */
CobBciEna = 1<<3, /* BCI function enable */
CbeMask = 0xFFFF8000, /* no. of entries in command buffer */
CbeShift = 15,
AltStatus1 = 0x48C64, /* Alternate Status Word 1: read onnly */
/* contains current texture surface tag, vertex buffer tag */
};
struct {
ulong idletimeout;
ulong tostatw[16];
} savagestats;
enum {
Maxloop = 1<<20
};
static void
savagewaitidle(VGAscr *scr)
{
long x;
ulong *statw, mask, goal;
switch(scr->id){
case SAVAGE4:
case PROSAVAGEP:
case PROSAVAGEK:
case PROSAVAGE8:
/* wait for engine idle and FIFO empty */
statw = (ulong*)((uchar*)scr->mmio+AltStatus0);
mask = CBEMask | Ge2Idle;
goal = Ge2Idle;
break;
/* case SAVAGEMXMV: ? */
/* case SAVAGEMX: ? */
/* case SAVAGEIX: ? */
case SUPERSAVAGEIXC16:
case SAVAGEIXMV:
case SAVAGEMXMV:
/* wait for engine idle and FIFO empty */
statw = (ulong*)((uchar*)scr->mmio+XStatus0);
mask = CBEMaskA | Ge2IdleA;
goal = Ge2IdleA;
break;
default:
/*
* best we can do: can't print or we'll call ourselves.
* savageinit is supposed to not let this happen.
*/
return;
}
for(x=0; x<Maxloop; x++)
if((*statw & mask) == goal)
return;
savagestats.tostatw[savagestats.idletimeout++&15] = *statw;
savagestats.tostatw[savagestats.idletimeout++&15] = (ulong)statw;
}
static int
savagefill(VGAscr *scr, Rectangle r, ulong sval)
{
uchar *mmio;
mmio = (uchar*)scr->mmio;
*(ulong*)(mmio+FgColor) = sval;
*(ulong*)(mmio+BgColor) = sval;
*(ulong*)(mmio+BgMix) = SrcFg|MixNew;
*(ulong*)(mmio+FgMix) = SrcFg|MixNew;
*(ushort*)(mmio+RectY) = r.min.y;
*(ushort*)(mmio+RectX) = r.min.x;
*(ushort*)(mmio+Width) = Dx(r)-1;
*(ushort*)(mmio+Height) = Dy(r)-1;
*(ulong*)(mmio+DrawCmd) = CmdMagic | DoDraw | CmdFill | DrawRight | DrawDown;
savagewaitidle(scr);
return 1;
}
static int
savagescroll(VGAscr *scr, Rectangle r, Rectangle sr)
{
uchar *mmio;
ulong cmd;
Point dp, sp;
cmd = CmdMagic | DoDraw | CmdBitblt | SrcPBD | DstGBD;
if(r.min.x <= sr.min.x){
cmd |= DrawRight;
dp.x = r.min.x;
sp.x = sr.min.x;
}else{
dp.x = r.max.x-1;
sp.x = sr.max.x-1;
}
if(r.min.y <= sr.min.y){
cmd |= DrawDown;
dp.y = r.min.y;
sp.y = sr.min.y;
}else{
dp.y = r.max.y-1;
sp.y = sr.max.y-1;
}
mmio = (uchar*)scr->mmio;
*(ushort*)(mmio+SourceX) = sp.x;
*(ushort*)(mmio+SourceY) = sp.y;
*(ushort*)(mmio+DestX) = dp.x;
*(ushort*)(mmio+DestY) = dp.y;
*(ushort*)(mmio+Width) = Dx(r)-1;
*(ushort*)(mmio+Height) = Dy(r)-1;
*(ulong*)(mmio+BgMix) = SrcDisp|MixNew;
*(ulong*)(mmio+FgMix) = SrcDisp|MixNew;
*(ulong*)(mmio+DrawCmd) = cmd;
savagewaitidle(scr);
return 1;
}
static void
savageblank(VGAscr*, int blank)
{
uchar seqD;
/*
* Will handle DPMS to monitor
*/
vgaxo(Seqx, 8, vgaxi(Seqx,8)|0x06);
seqD = vgaxi(Seqx, 0xD);
seqD &= 0x03;
if(blank)
seqD |= 0x50;
vgaxo(Seqx, 0xD, seqD);
/*
* Will handle LCD
*/
if(blank)
vgaxo(Seqx, 0x31, vgaxi(Seqx, 0x31) & ~0x10);
else
vgaxo(Seqx, 0x31, vgaxi(Seqx, 0x31) | 0x10);
}
void
savageinit(VGAscr *scr)
{
uchar *mmio;
ulong bd;
/* if you add chip IDs here be sure to update savagewaitidle */
switch(scr->id){
case SAVAGE4:
case PROSAVAGEP:
case PROSAVAGEK:
case PROSAVAGE8:
case SAVAGEIXMV:
case SUPERSAVAGEIXC16:
case SAVAGEMXMV:
break;
default:
print("unknown savage %.4lux\n", scr->id);
return;
}
mmio = (uchar*)scr->mmio;
if(mmio == nil) {
print("savageinit: no mmio\n");
return;
}
/* 2D graphics engine software reset */
*(ushort*)(mmio+SubsystemCtl) = GeSoftReset;
delay(2);
*(ushort*)(mmio+SubsystemCtl) = 0;
savagewaitidle(scr);
/* disable BCI as much as possible */
*(ushort*)(mmio+CobPtr) &= ~CobBciEna;
*(ushort*)(mmio+GBD2) &= ~GBDBciEna;
savagewaitidle(scr);
/* enable 32-bit writes, disable clipping */
*(ushort*)(mmio+MfMiscCtl) = MfMiscMagic|W32Ena|ClipDis;
savagewaitidle(scr);
/* enable all read, write planes */
*(ulong*)(mmio+BitplaneRmask) = ~0;
*(ulong*)(mmio+BitplaneWmask) = ~0;
savagewaitidle(scr);
/* turn on linear access, 2D engine */
*(ulong*)(mmio+AdvFunCtl) |= GeEna|LaEna;
savagewaitidle(scr);
/* set bitmap descriptors */
bd = (scr->gscreen->depth<<DepthShift) |
(Dx(scr->gscreen->r)<<StrideShift) | BlockWriteDis
| BDS64;
*(ulong*)(mmio+GBD1) = 0;
*(ulong*)(mmio+GBD2) = bd;
*(ulong*)(mmio+PBD1) = 0;
*(ulong*)(mmio+PBD2) = bd;
*(ulong*)(mmio+SBD1) = 0;
*(ulong*)(mmio+SBD2) = bd;
/*
* For some reason, the GBD needs to get programmed twice,
* once before the PBD, SBD, and once after.
* This empirically makes it get set right.
* I would like to better understand the ugliness
* going on here.
*/
*(ulong*)(mmio+GBD1) = 0;
*(ulong*)(mmio+GBD2) = bd;
*(ushort*)(mmio+GBD2+2) = bd>>16;
savagewaitidle(scr);
scr->fill = savagefill;
scr->scroll = savagescroll;
scr->blank = savageblank;
hwblank = 0;
}