Import sources from 2011-03-30 iso image

1 files changed, 95 insertions, 0 deletions

diff --git a/sys/src/cmd/aux/vga/ics2494.c b/sys/src/cmd/aux/vga/ics2494.c
new file mode 100755
index 000000000..d9c149d12
--- /dev/null
+++ b/sys/src/cmd/aux/vga/ics2494.c
@@ -0,0 +1,95 @@
+/*
+ * Integrated Circuit Systems, Inc.
+ * ICS2494[A] Dual Video/Memory Clock Generator.
+ */
+#include <u.h>
+#include <libc.h>
+#include <bio.h>
+
+#include "pci.h"
+#include "vga.h"
+
+typedef struct {
+	char*	name[2];
+	ulong	frequency[16];
+} Pattern;
+
+static Pattern patterns[] = {
+	{ "237", "304",
+	 50350000,  56644000,  65000000,  72000000,  80000000,  89800000,  63000000,  75000000,
+	 25175000,  28322000,  31500000,  36000000,  40000000,  44900000,  50000000,  65000000,
+	},
+
+	{ "324", 0,
+	 50350000,  56644000,  65000000,  72000000,  80000000,  89800000,  63000000,  75000000,
+	 83078000,  93463000, 100000000, 104000000, 108000000, 120000000, 130000000, 134700000,
+	},
+
+	{ 0,
+	},
+};
+
+static void
+init(Vga* vga, Ctlr* ctlr)
+{
+	Pattern *pattern;
+	char *p;
+	int f, index, divisor, maxdivisor;
+
+	if(ctlr->flag & Finit)
+		return;
+
+	if(vga->f[0] == 0)
+		vga->f[0] = vga->mode->frequency;
+
+	if((p = strchr(ctlr->name, '-')) == 0)
+		error("%s: unknown pattern\n", ctlr->name);
+	p++;
+
+	for(pattern = patterns; pattern->name[0]; pattern++){
+		if(strcmp(pattern->name[0], p) == 0)
+			break;
+		if(pattern->name[1] && strcmp(pattern->name[1], p) == 0)
+			break;
+	}
+	if(pattern->name[0] == 0)
+		error("%s: unknown pattern\n", ctlr->name);
+
+	maxdivisor = 1;
+	if(vga->ctlr && (vga->ctlr->flag & Hclkdiv))
+		maxdivisor = 8;
+	for(index = 0; index < 16; index++){
+		for(divisor = 1; divisor <= maxdivisor; divisor <<= 1){
+			f = vga->f[0] - pattern->frequency[index]/divisor;
+			if(f < 0)
+				f = -f;
+			if(f < 1000000){
+				/*vga->f = pattern->frequency[index];*/
+				vga->d[0] = divisor;
+				vga->i[0] = index;
+
+				ctlr->flag |= Finit;
+				return;
+			}
+		}
+	}
+	error("%s: can't find frequency %ld\n", ctlr->name, vga->f[0]);
+}
+
+Ctlr ics2494 = {
+	"ics2494",			/* name */
+	0,				/* snarf */
+	0,				/* options */
+	init,				/* init */
+	0,				/* load */
+	0,				/* dump */
+};
+
+Ctlr ics2494a = {
+	"ics2494a",			/* name */
+	0,				/* snarf */
+	0,				/* options */
+	init,				/* init */
+	0,				/* load */
+	0,				/* dump */
+};