X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=gp2x%2Fpollux_dpc_set.c;fp=gp2x%2Fpollux_dpc_set.c;h=beddc21bbfb7855f4aee7139cd7056d753f646d7;hb=e8f5db5d5a80a62069354466c64a9b90a2ced47c;hp=0000000000000000000000000000000000000000;hpb=c872443f88bd037784f795767041db9e307ac3f0;p=gpsp.git

diff --git a/gp2x/pollux_dpc_set.c b/gp2x/pollux_dpc_set.c
new file mode 100644
index 0000000..beddc21
--- /dev/null
+++ b/gp2x/pollux_dpc_set.c
@@ -0,0 +1,168 @@
+/*
+ * quick tool to set LCD timings for Wiz
+ * (c) notaz, 2009
+ * code dedicated to public domain.
+ *
+ * HTOTAL:    X VTOTAL:  341
+ * HSWIDTH:   1 VSWIDTH:   0
+ * HASTART:  37 VASTART:  17
+ * HAEND:   277 VAEND:   337
+ *
+ * 120Hz
+ * pcd  8, 447: + 594us
+ * pcd  9, 397: +  36us
+ * pcd 10, 357: - 523us
+ * pcd 11, 325: +1153us
+ *
+ * 'lcd_timings=397,1,37,277,341,0,17,337;clkdiv0=9'
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "pollux_dpc_set.h"
+
+/*
+ * set LCD timings based on preformated string (see usage() below for params).
+ * returns 0 on success.
+ */
+int pollux_dpc_set(volatile unsigned short *memregs, const char *str)
+{
+	int timings[8], have_timings = 0;
+	int pcd = 0, have_pcd = 0;
+	const char *p;
+	int i, ret;
+
+	if (str == NULL)
+		return -1;
+
+	p = str;
+	while (1)
+	{
+		if (strncmp(p, "lcd_timings=", 12) == 0)
+		{
+			int c;
+			p += 12;
+			ret = sscanf(p, "%d,%d,%d,%d,%d,%d,%d,%d",
+				&timings[0], &timings[1], &timings[2], &timings[3],
+				&timings[4], &timings[5], &timings[6], &timings[7]);
+			if (ret != 8)
+				break;
+			/* skip seven commas */
+			for (c = 0; c < 7 && *p != 0; p++)
+				if (*p == ',')
+						c++;
+			if (c != 7)
+				break;
+			/* skip last number */
+			while ('0' <= *p && *p <= '9')
+				p++;
+			have_timings = 1;
+		}
+		else if (strncmp(p, "clkdiv0=", 8) == 0)
+		{
+			char *ep;
+			p += 8;
+			pcd = strtoul(p, &ep, 10);
+			if (p == ep)
+				break;
+			p = ep;
+			have_pcd = 1;
+		}
+		else
+			break;
+
+		while (*p == ';' || *p == ' ')
+			p++;
+		if (*p == 0)
+			goto parse_done;
+	}
+
+	fprintf(stderr, "dpc_set parser: error at '%s'\n", p);
+	return -1;
+
+parse_done:
+	/* some validation */
+	if (have_timings)
+	{
+		for (i = 0; i < 8; i++)
+			if (timings[i] & ~0xffff) {
+				fprintf(stderr, "dpc_set: invalid timing %d: %d\n", i, timings[i]);
+				return -1;
+			}
+	}
+
+	if (have_pcd)
+	{
+		if ((pcd - 1) & ~0x3f) {
+			fprintf(stderr, "dpc_set: invalid clkdiv0: %d\n", pcd);
+			return -1;
+		}
+	}
+
+	/* write */
+	if (have_timings)
+	{
+		for (i = 0; i < 8; i++)
+			memregs[(0x307c>>1) + i] = timings[i];
+	}
+
+	if (have_pcd)
+	{
+		int tmp;
+		pcd = (pcd - 1) & 0x3f;
+		tmp = memregs[0x31c4>>1];
+		memregs[0x31c4>>1] = (tmp & ~0x3f0) | (pcd << 4);
+	}
+
+	return 0;
+}
+
+#ifdef BINARY
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <unistd.h>
+
+static void usage(const char *binary)
+{
+	printf("usage:\n%s <set_str[;set_str[;...]]>\n"
+		"set_str:\n"
+		"  lcd_timings=<htotal,hswidth,hastart,haend,vtotal,vswidth,vastart,vaend>\n"
+		"  clkdiv0=<divider>\n", binary);
+}
+
+int main(int argc, char *argv[])
+{
+	volatile unsigned short *memregs;
+	int ret, memdev;
+
+	if (argc != 2) {
+		usage(argv[0]);
+		return 1;
+	}
+
+	memdev = open("/dev/mem", O_RDWR);
+	if (memdev == -1)
+	{
+		perror("open(/dev/mem) failed");
+		return 1;
+	}
+
+	memregs	= mmap(0, 0x10000, PROT_READ|PROT_WRITE, MAP_SHARED, memdev, 0xc0000000);
+	if (memregs == MAP_FAILED)
+	{
+		perror("mmap(memregs) failed");
+		close(memdev);
+		return 1;
+	}
+
+	ret = pollux_dpc_set(memregs, argv[1]);
+
+	munmap((void *)memregs, 0x10000);
+	close(memdev);
+
+	return ret;
+}
+#endif