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cyblafb.c
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cyblafb.c
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/*
* Frame buffer driver for Trident Cyberblade/i1 graphics core
*
* Copyright 2005 Knut Petersen <Knut_Petersen@t-online.de>
*
* CREDITS:
* tridentfb.c by Jani Monoses
* see files above for further credits
*
*/
#define CYBLAFB_DEBUG 0
#define CYBLAFB_KD_GRAPHICS_QUIRK 1
#define CYBLAFB_PIXMAPSIZE 8192
#include <linux/module.h>
#include <linux/string.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <asm/types.h>
#include <video/cyblafb.h>
#define VERSION "0.62"
struct cyblafb_par {
u32 pseudo_pal[16];
struct fb_ops ops;
};
static struct fb_fix_screeninfo cyblafb_fix __devinitdata = {
.id = "CyBla",
.type = FB_TYPE_PACKED_PIXELS,
.xpanstep = 1,
.ypanstep = 1,
.ywrapstep = 1,
.visual = FB_VISUAL_PSEUDOCOLOR,
.accel = FB_ACCEL_NONE,
};
static char *mode __devinitdata = NULL;
static int bpp __devinitdata = 8;
static int ref __devinitdata = 75;
static int fp __devinitdata;
static int crt __devinitdata;
static int memsize __devinitdata;
static int basestride;
static int vesafb;
static int nativex;
static int center;
static int stretch;
static int pciwb = 1;
static int pcirb = 1;
static int pciwr = 1;
static int pcirr = 1;
static int disabled;
static int verbosity;
static int displaytype;
static void __iomem *io_virt; // iospace virtual memory address
module_param(mode, charp, 0);
module_param(bpp, int, 0);
module_param(ref, int, 0);
module_param(fp, int, 0);
module_param(crt, int, 0);
module_param(nativex, int, 0);
module_param(center, int, 0);
module_param(stretch, int, 0);
module_param(pciwb, int, 0);
module_param(pcirb, int, 0);
module_param(pciwr, int, 0);
module_param(pcirr, int, 0);
module_param(memsize, int, 0);
module_param(verbosity, int, 0);
//=========================================
//
// Well, we have to fix the upper layers.
// Until this has been done, we work around
// the bugs.
//
//=========================================
#if (CYBLAFB_KD_GRAPHICS_QUIRK && CYBLAFB_DEBUG)
if (disabled) { \
printk("********\n");\
dump_stack();\
return val;\
}
#elif CYBLAFB_KD_GRAPHICS_QUIRK
#define KD_GRAPHICS_RETURN(val)\
if (disabled) {\
return val;\
}
#else
#define KD_GRAPHICS_RETURN(val)
#endif
//=========================================
//
// Port access macros for memory mapped io
//
//=========================================
#define out8(r, v) writeb(v, io_virt + r)
#define out32(r, v) writel(v, io_virt + r)
#define in8(r) readb(io_virt + r)
#define in32(r) readl(io_virt + r)
//======================================
//
// Hardware access inline functions
//
//======================================
static inline u8 read3X4(u32 reg)
{
out8(0x3D4, reg);
return in8(0x3D5);
}
static inline u8 read3C4(u32 reg)
{
out8(0x3C4, reg);
return in8(0x3C5);
}
static inline u8 read3CE(u32 reg)
{
out8(0x3CE, reg);
return in8(0x3CF);
}
static inline void write3X4(u32 reg, u8 val)
{
out8(0x3D4, reg);
out8(0x3D5, val);
}
static inline void write3C4(u32 reg, u8 val)
{
out8(0x3C4, reg);
out8(0x3C5, val);
}
static inline void write3CE(u32 reg, u8 val)
{
out8(0x3CE, reg);
out8(0x3CF, val);
}
static inline void write3C0(u32 reg, u8 val)
{
in8(0x3DA); // read to reset index
out8(0x3C0, reg);
out8(0x3C0, val);
}
//=================================================
//
// Enable memory mapped io and unprotect registers
//
//=================================================
static void enable_mmio(void)
{
u8 tmp;
outb(0x0B, 0x3C4);
inb(0x3C5); // Set NEW mode
outb(SR0E, 0x3C4); // write enable a lot of extended ports
outb(0x80, 0x3C5);
outb(SR11, 0x3C4); // write enable those extended ports that
outb(0x87, 0x3C5); // are not affected by SR0E_New
outb(CR1E, 0x3d4); // clear write protect bit for port 0x3c2
tmp = inb(0x3d5) & 0xBF;
outb(CR1E, 0x3d4);
outb(tmp, 0x3d5);
outb(CR39, 0x3D4);
outb(inb(0x3D5) | 0x01, 0x3D5); // Enable mmio
}
//=================================================
//
// Set pixel clock VCLK1
// - multipliers set elswhere
// - freq in units of 0.01 MHz
//
// Hardware bug: SR18 >= 250 is broken for the
// cyberblade/i1
//
//=================================================
static void set_vclk(struct cyblafb_par *par, int freq)
{
u32 m, n, k;
int f, fi, d, di;
u8 lo = 0, hi = 0;
d = 2000;
k = freq >= 10000 ? 0 : freq >= 5000 ? 1 : freq >= 2500 ? 2 : 3;
for (m = 0; m < 64; m++)
for (n = 0; n < 250; n++) {
fi = (int)(((5864727 * (n + 8)) /
((m + 2) * (1 << k))) >> 12);
if ((di = abs(fi - freq)) < d) {
d = di;
f = fi;
lo = (u8) n;
hi = (u8) ((k << 6) | m);
}
}
write3C4(SR19, hi);
write3C4(SR18, lo);
if (verbosity > 0)
output("pixclock = %d.%02d MHz, k/m/n %x %x %x\n",
freq / 100, freq % 100, (hi & 0xc0) >> 6, hi & 0x3f, lo);
}
//================================================
//
// Cyberblade specific Graphics Engine (GE) setup
//
//================================================
static void cyblafb_setup_GE(int pitch, int bpp)
{
KD_GRAPHICS_RETURN();
switch (bpp) {
case 8:
basestride = ((pitch >> 3) << 20) | (0 << 29);
break;
case 15:
basestride = ((pitch >> 3) << 20) | (5 << 29);
break;
case 16:
basestride = ((pitch >> 3) << 20) | (1 << 29);
break;
case 24:
case 32:
basestride = ((pitch >> 3) << 20) | (2 << 29);
break;
}
write3X4(CR36, 0x90); // reset GE
write3X4(CR36, 0x80); // enable GE
out32(GE24, 1 << 7); // reset all GE pointers by toggling
out32(GE24, 0); // d7 of GE24
write3X4(CR2D, 0x00); // GE Timinigs, no delays
out32(GE6C, 0); // Pattern and Style, p 129, ok
}
//=====================================================================
//
// Cyberblade specific syncing
//
// A timeout might be caused by disabled mmio.
// Cause:
// - bit CR39 & 1 == 0 upon return, X trident driver bug
// - kdm bug (KD_GRAPHICS not set on first switch)
// - kernel design flaw (it believes in the correctness
// of kdm/X
// First we try to sync ignoring that problem, as most of the
// time that will succeed immediately and the enable_mmio()
// would only degrade performance.
//
//=====================================================================
static int cyblafb_sync(struct fb_info *info)
{
u32 status, i = 100000;
KD_GRAPHICS_RETURN(0);
while (((status = in32(GE20)) & 0xFe800000) && i != 0)
i--;
if (i == 0) {
enable_mmio();
i = 1000000;
while (((status = in32(GE20)) & 0xFA800000) && i != 0)
i--;
if (i == 0) {
output("GE Timeout, status: %x\n", status);
if (status & 0x80000000)
output("Bresenham Engine : Busy\n");
if (status & 0x40000000)
output("Setup Engine : Busy\n");
if (status & 0x20000000)
output("SP / DPE : Busy\n");
if (status & 0x10000000)
output("Memory Interface : Busy\n");
if (status & 0x08000000)
output("Com Lst Proc : Busy\n");
if (status & 0x04000000)
output("Block Write : Busy\n");
if (status & 0x02000000)
output("Command Buffer : Full\n");
if (status & 0x01000000)
output("RESERVED : Busy\n");
if (status & 0x00800000)
output("PCI Write Buffer : Busy\n");
cyblafb_setup_GE(info->var.xres,
info->var.bits_per_pixel);
}
}
return 0;
}
//==============================
//
// Cyberblade specific fillrect
//
//==============================
static void cyblafb_fillrect(struct fb_info *info, const struct fb_fillrect *fr)
{
u32 bpp = info->var.bits_per_pixel, col, desty, height;
KD_GRAPHICS_RETURN();
switch (bpp) {
default:
case 8:
col = fr->color;
col |= col << 8;
col |= col << 16;
break;
case 16:
col = ((u32 *) (info->pseudo_palette))[fr->color];
col |= col << 16;
break;
case 32:
col = ((u32 *) (info->pseudo_palette))[fr->color];
break;
}
desty = fr->dy;
height = fr->height;
while (height) {
out32(GEB8, basestride | ((desty * info->var.xres_virtual *
bpp) >> 6));
out32(GE60, col);
out32(GE48, fr->rop ? 0x66 : ROP_S);
out32(GE44, 0x20000000 | 1 << 19 | 1 << 4 | 2 << 2);
out32(GE08, point(fr->dx, 0));
out32(GE0C, point(fr->dx + fr->width - 1,
height > 4096 ? 4095 : height - 1));
if (likely(height <= 4096))
return;
desty += 4096;
height -= 4096;
}
}
//================================================
//
// Cyberblade specific copyarea
//
// This function silently assumes that it never
// will be called with width or height exceeding
// 4096.
//
//================================================
static void cyblafb_copyarea(struct fb_info *info, const struct fb_copyarea *ca)
{
u32 s1, s2, d1, d2, direction;
KD_GRAPHICS_RETURN();
s1 = point(ca->sx, 0);
s2 = point(ca->sx + ca->width - 1, ca->height - 1);
d1 = point(ca->dx, 0);
d2 = point(ca->dx + ca->width - 1, ca->height - 1);
if ((ca->sy > ca->dy) || ((ca->sy == ca->dy) && (ca->sx > ca->dx)))
direction = 0;
else
direction = 2;
out32(GEB8, basestride | ((ca->dy * info->var.xres_virtual *
info->var.bits_per_pixel) >> 6));
out32(GEC8, basestride | ((ca->sy * info->var.xres_virtual *
info->var.bits_per_pixel) >> 6));
out32(GE44, 0xa0000000 | 1 << 19 | 1 << 2 | direction);
out32(GE00, direction ? s2 : s1);
out32(GE04, direction ? s1 : s2);
out32(GE08, direction ? d2 : d1);
out32(GE0C, direction ? d1 : d2);
}
//=======================================================================
//
// Cyberblade specific imageblit
//
// Accelerated for the most usual case, blitting 1 - bit deep
// character images. Everything else is passed to the generic imageblit
// unless it is so insane that it is better to printk an alert.
//
// Hardware bug: _Never_ blit across pixel column 2048, that will lock
// the system. We split those blit requests into three blitting
// operations.
//
//=======================================================================
static void cyblafb_imageblit(struct fb_info *info,
const struct fb_image *image)
{
u32 fgcol, bgcol;
u32 *pd = (u32 *) image->data;
u32 bpp = info->var.bits_per_pixel;
KD_GRAPHICS_RETURN();
// Used only for drawing the penguine (image->depth > 1)
if (image->depth != 1) {
cfb_imageblit(info, image);
return;
}
// That should never happen, but it would be fatal
if (image->width == 0 || image->height == 0) {
output("imageblit: width/height 0 detected\n");
return;
}
if (info->fix.visual == FB_VISUAL_TRUECOLOR ||
info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
fgcol = ((u32 *) (info->pseudo_palette))[image->fg_color];
bgcol = ((u32 *) (info->pseudo_palette))[image->bg_color];
} else {
fgcol = image->fg_color;
bgcol = image->bg_color;
}
switch (bpp) {
case 8:
fgcol |= fgcol << 8;
bgcol |= bgcol << 8;
case 16:
fgcol |= fgcol << 16;
bgcol |= bgcol << 16;
default:
break;
}
out32(GEB8, basestride | ((image->dy * info->var.xres_virtual *
bpp) >> 6));
out32(GE60, fgcol);
out32(GE64, bgcol);
if (!(image->dx < 2048 && (image->dx + image->width - 1) >= 2048)) {
u32 dds = ((image->width + 31) >> 5) * image->height;
out32(GE44, 0xa0000000 | 1 << 20 | 1 << 19);
out32(GE08, point(image->dx, 0));
out32(GE0C, point(image->dx + image->width - 1,
image->height - 1));
while (dds--)
out32(GE9C, *pd++);
} else {
int i, j;
u32 ddstotal = (image->width + 31) >> 5;
u32 ddsleft = (2048 - image->dx + 31) >> 5;
u32 skipleft = ddstotal - ddsleft;
out32(GE44, 0xa0000000 | 1 << 20 | 1 << 19);
out32(GE08, point(image->dx, 0));
out32(GE0C, point(2048 - 1, image->height - 1));
for (i = 0; i < image->height; i++) {
for (j = 0; j < ddsleft; j++)
out32(GE9C, *pd++);
pd += skipleft;
}
if (image->dx % 32) {
out32(GE44, 0xa0000000 | 1 << 20 | 1 << 19);
out32(GE08, point(2048, 0));
if (image->width > ddsleft << 5)
out32(GE0C, point(image->dx + (ddsleft << 5) -
1, image->height - 1));
else
out32(GE0C, point(image->dx + image->width - 1,
image->height - 1));
pd = ((u32 *) image->data) + ddstotal - skipleft - 1;
for (i = 0; i < image->height; i++) {
out32(GE9C, swab32(swab32(*pd) << ((32 -
(image->dx & 31)) & 31)));
pd += ddstotal;
}
}
if (skipleft) {
out32(GE44, 0xa0000000 | 1 << 20 | 1 << 19);
out32(GE08, point(image->dx + (ddsleft << 5), 0));
out32(GE0C, point(image->dx + image->width - 1,
image->height - 1));
pd = (u32 *) image->data;
for (i = 0; i < image->height; i++) {
pd += ddsleft;
for (j = 0; j < skipleft; j++)
out32(GE9C, *pd++);
}
}
}
}
//==========================================================
//
// Check if video mode is acceptable. We change var->??? if
// video mode is slightly off or return error otherwise.
// info->??? must not be changed!
//
//==========================================================
static int cyblafb_check_var(struct fb_var_screeninfo *var,
struct fb_info *info)
{
int bpp = var->bits_per_pixel;
//
// we try to support 8, 16, 24 and 32 bpp modes,
// default to 8
//
// there is a 24 bpp mode, but for now we change requests to 32 bpp
// (This is what tridentfb does ... will be changed in the future)
//
//
if (bpp % 8 != 0 || bpp < 8 || bpp > 32)
bpp = 8;
if (bpp == 24)
bpp = var->bits_per_pixel = 32;
//
// interlaced modes are broken, fail if one is requested
//
if (var->vmode & FB_VMODE_INTERLACED)
return -EINVAL;
//
// fail if requested resolution is higher than physical
// flatpanel resolution
//
if ((displaytype == DISPLAY_FP) && nativex && var->xres > nativex)
return -EINVAL;
//
// we do not allow vclk to exceed 230 MHz. If the requested
// vclk is too high, we default to 200 MHz
//
if ((bpp == 32 ? 200000000 : 100000000) / var->pixclock > 23000)
var->pixclock = (bpp == 32 ? 200000000 : 100000000) / 20000;
//
// enforce (h|v)sync_len limits
//
var->hsync_len &= ~7;
if(var->hsync_len > 248)
var->hsync_len = 248;
var->vsync_len &= 15;
//
// Enforce horizontal and vertical hardware limits.
// 1600x1200 is mentioned as a maximum, but higher resolutions could
// work with slow refresh, small margins and short sync.
//
var->xres &= ~7;
if (((var->xres + var->left_margin + var->right_margin +
var->hsync_len) > (bpp == 32 ? 2040 : 4088)) ||
((var->yres + var->upper_margin + var->lower_margin +
var->vsync_len) > 2047))
return -EINVAL;
if ((var->xres > 1600) || (var->yres > 1200))
output("Mode %dx%d exceeds documented limits.\n",
var->xres, var->yres);
//
// try to be smart about (x|y)res_virtual problems.
//
if (var->xres > var->xres_virtual)
var->xres_virtual = var->xres;
if (var->yres > var->yres_virtual)
var->yres_virtual = var->yres;
if (bpp == 8 || bpp == 16) {
if (var->xres_virtual > 4088)
var->xres_virtual = 4088;
} else {
if (var->xres_virtual > 2040)
var->xres_virtual = 2040;
}
var->xres_virtual &= ~7;
while (var->xres_virtual * var->yres_virtual * bpp / 8 >
info->fix.smem_len) {
if (var->yres_virtual > var->yres)
var->yres_virtual--;
else if (var->xres_virtual > var->xres)
var->xres_virtual -= 8;
else
return -EINVAL;
}
switch (bpp) {
case 8:
var->red.offset = 0;
var->green.offset = 0;
var->blue.offset = 0;
var->red.length = 6;
var->green.length = 6;
var->blue.length = 6;
break;
case 16:
var->red.offset = 11;
var->green.offset = 5;
var->blue.offset = 0;
var->red.length = 5;
var->green.length = 6;
var->blue.length = 5;
break;
case 32:
var->red.offset = 16;
var->green.offset = 8;
var->blue.offset = 0;
var->red.length = 8;
var->green.length = 8;
var->blue.length = 8;
break;
default:
return -EINVAL;
}
return 0;
}
//=====================================================================
//
// Pan the display
//
// The datasheets defines crt start address to be 20 bits wide and
// to be programmed to CR0C, CR0D, CR1E and CR27. Actually there is
// CR2B[5] as an undocumented extension bit. Epia BIOS 2.07 does use
// it, so it is also safe to be used here. BTW: datasheet CR0E on page
// 90 really is CR1E, the real CRE is documented on page 72.
//
// BUT:
//
// As of internal version 0.60 we do not use vga panning any longer.
// Vga panning did not allow us the use of all available video memory
// and thus prevented ywrap scrolling. We do use the "right view"
// register now.
//
//
//=====================================================================
static int cyblafb_pan_display(struct fb_var_screeninfo *var,
struct fb_info *info)
{
KD_GRAPHICS_RETURN(0);
info->var.xoffset = var->xoffset;
info->var.yoffset = var->yoffset;
out32(GE10, 0x80000000 | ((var->xoffset + (var->yoffset *
var->xres_virtual)) * var->bits_per_pixel / 32));
return 0;
}
//============================================
//
// This will really help in case of a bug ...
// dump most gaphics core registers.
//
//============================================
static void regdump(struct cyblafb_par *par)
{
int i;
if (verbosity < 2)
return;
printk("\n");
for (i = 0; i <= 0xff; i++) {
outb(i, 0x3d4);
printk("CR%02x=%02x ", i, inb(0x3d5));
if (i % 16 == 15)
printk("\n");
}
outb(0x30, 0x3ce);
outb(inb(0x3cf) | 0x40, 0x3cf);
for (i = 0; i <= 0x1f; i++) {
if (i == 0 || (i > 2 && i < 8) || i == 0x10 || i == 0x11
|| i == 0x16) {
outb(i, 0x3d4);
printk("CR%02x=%02x ", i, inb(0x3d5));
} else
printk("------- ");
if (i % 16 == 15)
printk("\n");
}
outb(0x30, 0x3ce);
outb(inb(0x3cf) & 0xbf, 0x3cf);
printk("\n");
for (i = 0; i <= 0x7f; i++) {
outb(i, 0x3ce);
printk("GR%02x=%02x ", i, inb(0x3cf));
if (i % 16 == 15)
printk("\n");
}
printk("\n");
for (i = 0; i <= 0xff; i++) {
outb(i, 0x3c4);
printk("SR%02x=%02x ", i, inb(0x3c5));
if (i % 16 == 15)
printk("\n");
}
printk("\n");
for (i = 0; i <= 0x1F; i++) {
inb(0x3da); // next access is index!
outb(i, 0x3c0);
printk("AR%02x=%02x ", i, inb(0x3c1));
if (i % 16 == 15)
printk("\n");
}
printk("\n");
inb(0x3DA); // reset internal flag to 3c0 index
outb(0x20, 0x3C0); // enable attr
return;
}
//=======================================================================
//
// Save State
//
// This function is called while a switch to KD_TEXT is in progress,
// before any of the other functions are called.
//
//=======================================================================
static void cyblafb_save_state(struct fb_info *info)
{
struct cyblafb_par *par = info->par;
if (verbosity > 0)
output("Switching to KD_TEXT\n");
disabled = 0;
regdump(par);
enable_mmio();
return;
}
//=======================================================================
//
// Restore State
//
// This function is called while a switch to KD_GRAPHICS is in progress,
// We have to turn on vga style panning registers again because the
// trident driver of X does not know about GE10.
//
//=======================================================================
static void cyblafb_restore_state(struct fb_info *info)
{
if (verbosity > 0)
output("Switching to KD_GRAPHICS\n");
out32(GE10, 0);
disabled = 1;
return;
}
//======================================
//
// Set hardware to requested video mode
//
//======================================
static int cyblafb_set_par(struct fb_info *info)
{
struct cyblafb_par *par = info->par;
u32 htotal, hdispend, hsyncstart, hsyncend, hblankstart,
hblankend, preendfetch, vtotal, vdispend, vsyncstart,
vsyncend, vblankstart, vblankend;
struct fb_var_screeninfo *var = &info->var;
int bpp = var->bits_per_pixel;
int i;
KD_GRAPHICS_RETURN(0);
if (verbosity > 0)
output("Switching to new mode: "
"fbset -g %d %d %d %d %d -t %d %d %d %d %d %d %d\n",
var->xres, var->yres, var->xres_virtual,
var->yres_virtual, var->bits_per_pixel, var->pixclock,
var->left_margin, var->right_margin, var->upper_margin,
var->lower_margin, var->hsync_len, var->vsync_len);
htotal = (var->xres + var->left_margin + var->right_margin +
var->hsync_len) / 8 - 5;
hdispend = var->xres / 8 - 1;
hsyncstart = (var->xres + var->right_margin) / 8;
hsyncend = var->hsync_len / 8;
hblankstart = hdispend + 1;
hblankend = htotal + 3; // should be htotal + 5, bios does it this way
preendfetch = ((var->xres >> 3) + 1) * ((bpp + 1) >> 3);
vtotal = var->yres + var->upper_margin + var->lower_margin +
var->vsync_len - 2;
vdispend = var->yres - 1;
vsyncstart = var->yres + var->lower_margin;
vblankstart = var->yres;
vblankend = vtotal; // should be vtotal + 2, but bios does it this way
vsyncend = var->vsync_len;
enable_mmio(); // necessary! ... check X ...
write3X4(CR11, read3X4(CR11) & 0x7F); // unlock cr00 .. cr07
write3CE(GR30, 8);
if ((displaytype == DISPLAY_FP) && var->xres < nativex) {
// stretch or center ?
out8(0x3C2, 0xEB);
write3CE(GR30, read3CE(GR30) | 0x81); // shadow mode on
if (center) {
write3CE(GR52, (read3CE(GR52) & 0x7C) | 0x80);
write3CE(GR53, (read3CE(GR53) & 0x7C) | 0x80);
} else if (stretch) {
write3CE(GR5D, 0);
write3CE(GR52, (read3CE(GR52) & 0x7C) | 1);
write3CE(GR53, (read3CE(GR53) & 0x7C) | 1);
}
} else {
out8(0x3C2, 0x2B);
write3CE(GR30, 8);
}
//
// Setup CRxx regs
//
write3X4(CR00, htotal & 0xFF);
write3X4(CR01, hdispend & 0xFF);
write3X4(CR02, hblankstart & 0xFF);
write3X4(CR03, hblankend & 0x1F);
write3X4(CR04, hsyncstart & 0xFF);
write3X4(CR05, (hsyncend & 0x1F) | ((hblankend & 0x20) << 2));
write3X4(CR06, vtotal & 0xFF);
write3X4(CR07, (vtotal & 0x100) >> 8 |
(vdispend & 0x100) >> 7 |
(vsyncstart & 0x100) >> 6 |
(vblankstart & 0x100) >> 5 |
0x10 |
(vtotal & 0x200) >> 4 |
(vdispend & 0x200) >> 3 | (vsyncstart & 0x200) >> 2);
write3X4(CR08, 0);
write3X4(CR09, (vblankstart & 0x200) >> 4 | 0x40 | // FIX !!!
((info->var.vmode & FB_VMODE_DOUBLE) ? 0x80 : 0));
write3X4(CR0A, 0); // Init to some reasonable default
write3X4(CR0B, 0); // Init to some reasonable default
write3X4(CR0C, 0); // Offset 0
write3X4(CR0D, 0); // Offset 0
write3X4(CR0E, 0); // Init to some reasonable default
write3X4(CR0F, 0); // Init to some reasonable default
write3X4(CR10, vsyncstart & 0xFF);
write3X4(CR11, (vsyncend & 0x0F));
write3X4(CR12, vdispend & 0xFF);
write3X4(CR13, ((info->var.xres_virtual * bpp) / (4 * 16)) & 0xFF);
write3X4(CR14, 0x40); // double word mode
write3X4(CR15, vblankstart & 0xFF);
write3X4(CR16, vblankend & 0xFF);
write3X4(CR17, 0xE3);
write3X4(CR18, 0xFF);
// CR19: needed for interlaced modes ... ignore it for now
write3X4(CR1A, 0x07); // Arbitration Control Counter 1
write3X4(CR1B, 0x07); // Arbitration Control Counter 2
write3X4(CR1C, 0x07); // Arbitration Control Counter 3
write3X4(CR1D, 0x00); // Don't know, doesn't hurt ; -)
write3X4(CR1E, (info->var.vmode & FB_VMODE_INTERLACED) ? 0x84 : 0x80);
// CR1F: do not set, contains BIOS info about memsize
write3X4(CR20, 0x20); // enabe wr buf, disable 16bit planar mode
write3X4(CR21, 0x20); // enable linear memory access
// CR22: RO cpu latch readback
// CR23: ???
// CR24: RO AR flag state
// CR25: RAMDAC rw timing, pclk buffer tristate control ????
// CR26: ???
write3X4(CR27, (vdispend & 0x400) >> 6 |
(vsyncstart & 0x400) >> 5 |
(vblankstart & 0x400) >> 4 |
(vtotal & 0x400) >> 3 |
0x8);
// CR28: ???
write3X4(CR29, (read3X4(CR29) & 0xCF) | ((((info->var.xres_virtual *
bpp) / (4 * 16)) & 0x300) >> 4));
write3X4(CR2A, read3X4(CR2A) | 0x40);
write3X4(CR2B, (htotal & 0x100) >> 8 |
(hdispend & 0x100) >> 7 |
// (0x00 & 0x100) >> 6 | hinterlace para bit 8 ???
(hsyncstart & 0x100) >> 5 |
(hblankstart & 0x100) >> 4);
// CR2C: ???
// CR2D: initialized in cyblafb_setup_GE()
write3X4(CR2F, 0x92); // conservative, better signal quality
// CR30: reserved
// CR31: reserved
// CR32: reserved
// CR33: reserved
// CR34: disabled in CR36
// CR35: disabled in CR36
// CR36: initialized in cyblafb_setup_GE
// CR37: i2c, ignore for now
write3X4(CR38, (bpp == 8) ? 0x00 : //
(bpp == 16) ? 0x05 : // highcolor
(bpp == 24) ? 0x29 : // packed 24bit truecolor
(bpp == 32) ? 0x09 : 0); // truecolor, 16 bit pixelbus
write3X4(CR39, 0x01 | // MMIO enable
(pcirb ? 0x02 : 0) | // pci read burst enable
(pciwb ? 0x04 : 0)); // pci write burst enable
write3X4(CR55, 0x1F | // pci clocks * 2 for STOP# during 1st data phase
(pcirr ? 0x40 : 0) | // pci read retry enable
(pciwr ? 0x80 : 0)); // pci write retry enable
write3X4(CR56, preendfetch >> 8 < 2 ? (preendfetch >> 8 & 0x01) | 2
: 0);
write3X4(CR57, preendfetch >> 8 < 2 ? preendfetch & 0xff : 0);
write3X4(CR58, 0x82); // Bios does this .... don't know more
//
// Setup SRxx regs
//
write3C4(SR00, 3);
write3C4(SR01, 1); //set char clock 8 dots wide
write3C4(SR02, 0x0F); //enable 4 maps needed in chain4 mode
write3C4(SR03, 0); //no character map select
write3C4(SR04, 0x0E); //memory mode: ext mem, even, chain4
out8(0x3C4, 0x0b);
in8(0x3C5); // Set NEW mode
write3C4(SR0D, 0x00); // test ... check
set_vclk(par, (bpp == 32 ? 200000000 : 100000000)
/ info->var.pixclock); //SR18, SR19
//
// Setup GRxx regs
//
write3CE(GR00, 0x00); // test ... check
write3CE(GR01, 0x00); // test ... check
write3CE(GR02, 0x00); // test ... check
write3CE(GR03, 0x00); // test ... check
write3CE(GR04, 0x00); // test ... check
write3CE(GR05, 0x40); // no CGA compat, allow 256 col
write3CE(GR06, 0x05); // graphics mode
write3CE(GR07, 0x0F); // planes?
write3CE(GR08, 0xFF); // test ... check
write3CE(GR0F, (bpp == 32) ? 0x1A : 0x12); // vclk / 2 if 32bpp, chain4
write3CE(GR20, 0xC0); // test ... check
write3CE(GR2F, 0xA0); // PCLK = VCLK, no skew,
//
// Setup ARxx regs
//
for (i = 0; i < 0x10; i++) // set AR00 .. AR0f
write3C0(i, i);
write3C0(AR10, 0x41); // graphics mode and support 256 color modes
write3C0(AR12, 0x0F); // planes
write3C0(AR13, 0); // horizontal pel panning
in8(0x3DA); // reset internal flag to 3c0 index
out8(0x3C0, 0x20); // enable attr
//
// Setup hidden RAMDAC command register
//
in8(0x3C8); // these reads are
in8(0x3C6); // necessary to
in8(0x3C6); // unmask the RAMDAC
in8(0x3C6); // command reg, otherwise
in8(0x3C6); // we would write the pixelmask reg!
out8(0x3C6, (bpp == 8) ? 0x00 : // 256 colors
(bpp == 15) ? 0x10 : //
(bpp == 16) ? 0x30 : // hicolor
(bpp == 24) ? 0xD0 : // truecolor
(bpp == 32) ? 0xD0 : 0); // truecolor