From 74a4d8c26dd3c1e9febcb717cfd6cb6512991a7a Mon Sep 17 00:00:00 2001
From: "Charles.Forsyth" <devnull@localhost>
Date: Fri, 22 Dec 2006 21:39:35 +0000
Subject: 20060303

---
 os/boot/mpc/screen.c | 242 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 242 insertions(+)
 create mode 100644 os/boot/mpc/screen.c

(limited to 'os/boot/mpc/screen.c')

diff --git a/os/boot/mpc/screen.c b/os/boot/mpc/screen.c
new file mode 100644
index 00000000..ec420ee9
--- /dev/null
+++ b/os/boot/mpc/screen.c
@@ -0,0 +1,242 @@
+#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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