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#include "all.h"
#include <libg.h>
#include <gnot.h>
enum {
Colldepth = 3,
Colmaxx = 640,
Colmaxxvis = 640,
Colmaxy = 480,
};
#define MINX 8
extern GSubfont defont0;
struct{
Point pos;
int bwid;
}out;
typedef struct Mode Mode;
struct Mode {
int x;
int y;
int d;
char* aperture;
int apsize;
};
GBitmap gscreen;
Point gchar(GBitmap*, Point, GFont*, int, Fcode);
int setcolor(ulong, ulong, ulong, ulong);
static void lcdinit(Mode*);
void
screeninit(void)
{
Mode m;
m.x = Colmaxx;
m.y = Colmaxy;
m.d = Colldepth;
m.aperture = 0;
lcdinit(&m);
if(m.aperture == 0)
return;
gscreen.ldepth = 3;
gscreen.base = (ulong*)m.aperture;
gscreen.width = Colmaxx/BY2WD;
gscreen.r = Rect(0, 0, Colmaxxvis, Colmaxy);
gscreen.clipr = gscreen.r;
/*
* For now, just use a fixed colormap:
* 0 == white and 255 == black
*/
setcolor(0, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF);
setcolor(255, 0x00000000, 0x00000000, 0x00000000);
gbitblt(&gscreen, Pt(0, 0), &gscreen, gscreen.r, Zero);
out.pos.x = MINX;
out.pos.y = 0;
out.bwid = defont0.info[' '].width;
}
void
screenputc(int c)
{
Fontchar *i;
Point p;
if(gscreen.base == nil)
return;
switch(c){
case '\n':
out.pos.x = MINX;
out.pos.y += defont0.height;
if(out.pos.y > gscreen.r.max.y-defont0.height)
out.pos.y = gscreen.r.min.y;
gbitblt(&gscreen, Pt(0, out.pos.y), &gscreen,
Rect(0, out.pos.y, gscreen.r.max.x, out.pos.y+2*defont0.height),
Zero);
break;
case '\t':
out.pos.x += (8-((out.pos.x-MINX)/out.bwid&7))*out.bwid;
if(out.pos.x >= gscreen.r.max.x)
screenputc('\n');
break;
case '\b':
if(out.pos.x >= out.bwid+MINX){
out.pos.x -= out.bwid;
screenputc(' ');
out.pos.x -= out.bwid;
}
break;
default:
if(out.pos.x >= gscreen.r.max.x-out.bwid)
screenputc('\n');
c &= 0x7f;
if(c <= 0 || c >= defont0.n)
break;
i = defont0.info + c;
p = out.pos;
gbitblt(&gscreen, Pt(p.x+i->left, p.y), defont0.bits,
Rect(i[0].x, 0, i[1].x, defont0.height),
S);
out.pos.x = p.x + i->width;
break;
}
}
void
screenputs(char *s, int n)
{
while(n-- > 0)
screenputc(*s++);
}
/*
* See section 5.2.1 (page 5-6) of the MPC823 manual
*/
static uchar lcdclock[17] = { /* (a<<2)|b => divisor of (1<<a)*((b<<1)+1) */
0, 0, (1<<2), 1,
(2<<2), 2, (1<<2)|1, 3,
(3<<2), (1<<2)|2, (1<<2)|2, (2<<2)|1,
(2<<2)|1, (1<<2)|3, (1<<2)|3, (4<<2),
(4<<2)
};
/*
* support for the Sharp LQ64D341 TFT colour display
*/
enum {
COLS = 640,
ROWS = 480,
LDEPTH = 3, /* screen depth */
LCDFREQ = 25000000,
/* lccr */
ClockLow = 1<<11,
OELow = 1<<10,
HsyncLow = 1<<9,
VsyncLow = 1<<8,
DataLow = 1<<7,
Passive8 = 1<<4,
DualScan = 1<<3,
IsColour = 1<<2,
IsTFT = 1<<1,
Enable = 1<<0,
/* lchcr */
BigEndian = 1<<24,
AT7 = 7<<21, /* access type */
/* sdcr */
LAM = 1<<6, /* ``LCD aggressive mode'' */
};
/*
* TO DO: most of the data could come from a table
*/
static void
lcdinit(Mode *mode)
{
IMM *io;
int i, d;
long hz;
io = m->iomem;
mode->y = ROWS;
mode->x = COLS;
mode->d = LDEPTH;
mode->aperture = ialloc(mode->x*mode->y, 16);
mode->apsize = mode->x*mode->y;
io->sdcr &= ~LAM; /* MPC823 errata: turn off LAM before disabling controller */
io->lcfaa = PADDR(mode->aperture);
io->lccr = (((mode->x*mode->y*(1<<LDEPTH)+127)/128) << 17) | (LDEPTH << 5) | IsColour | IsTFT | OELow | VsyncLow | ClockLow;
switch(LDEPTH){
default:
case 0:
/* monochrome/greyscale identity map */
for(i=0; i<16; i++)
io->lcdmap[i] = i;
break;
case 2:
/* 4-bit grey scale map */
for(i=0; i<16; i++)
io->lcdmap[0] = (i<<8)|(i<<4)|i;
break;
case 3:
/* 8-bit linear map */
for(i=0; i<256; i++)
io->lcdmap[i] = (i<<8)|(i<<4)|i;
break;
}
io->lcvcr = (mode->y << 11) | (1<<28) | 33; /* 2 line vsync pulse, 34 line wait between frames */
io->lchcr = (mode->x<<10) | BigEndian | 228; /* clock cycles between lines */
hz = m->cpuhz;
d = hz/LCDFREQ;
if(hz/d > LCDFREQ)
d++;
if(d >= 16)
d = 16;
/*
* enable LCD outputs
*/
io->pddat = 0;
io->pdpar = 0x1fff;
io->pdpar &= ~SIBIT(6); /* 823 bug fix? */
io->pddir = 0x1fff;
io->pbpar |= IBIT(31) | IBIT(19) | IBIT(17);
io->pbdir |= IBIT(31) | IBIT(19) | IBIT(17);
io->pbodr &= ~(IBIT(31) | IBIT(19) | IBIT(17));
eieio();
io->sccrk = KEEP_ALIVE_KEY;
eieio();
io->sccr = (io->sccr & ~0x1F) | lcdclock[d];
eieio();
io->sccrk = ~KEEP_ALIVE_KEY;
eieio();
gscreen.width = gscreen.width; /* access external memory before enabling (mpc823 errata) */
io->lcsr = 7; /* clear status */
eieio();
io->lccr |= Enable;
archbacklight(1);
}
int
setcolor(ulong p, ulong r, ulong g, ulong b)
{
r >>= 28;
g >>= 28;
b >>= 28;
m->iomem->lcdmap[~p&0xFF] = (r<<8) | (g<<4) | b; /* TO DO: it's a function of the ldepth */
return 1;
}
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