From e44dbe72a3e1849fff4a5f93d56be590a1483af6 Mon Sep 17 00:00:00 2001
From: Kolja Waschk <urjtag@ixo.de>
Date: Sat, 16 Feb 2008 10:01:45 +0000
Subject: [PATCH] Add jedec_exp.c needed for --enable-jedec-exp

git-svn-id: https://urjtag.svn.sourceforge.net/svnroot/urjtag/trunk@1022 b68d4a1b-bc3d-0410-92ed-d4ac073336b7
---
 jtag/src/flash/jedec_exp.c | 98 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 98 insertions(+)
 create mode 100644 jtag/src/flash/jedec_exp.c

diff --git a/jtag/src/flash/jedec_exp.c b/jtag/src/flash/jedec_exp.c
new file mode 100644
index 00000000..388376c5
--- /dev/null
+++ b/jtag/src/flash/jedec_exp.c
@@ -0,0 +1,98 @@
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <flash/cfi.h>
+#include <flash/intel.h>
+#include <unistd.h>
+
+#include <flash.h>
+#include <bus.h>
+#include <bitmask.h>
+
+void jedec_exp_read_id(bus_t *bus, uint32_t adr, uint32_t dmask, 
+	uint32_t pata, uint32_t patb, uint32_t dcmd, 
+	int det_addroffset, int det_dataoffset, uint32_t det_addrpat)
+{
+	int locofs;
+
+	det_addrpat <<= det_addroffset;
+	printf("     trying with address pattern base %08x:", det_addrpat);
+	bus_write(bus, adr +  det_addrpat,     pata);
+	bus_write(bus, adr + (det_addrpat>>1), patb);
+	bus_write(bus, adr +  det_addrpat,     dcmd);
+
+	for(locofs = 0; locofs <= 2; locofs++)
+	{
+		printf(" %08x", (dmask & bus_read(bus, adr + (locofs<<det_addroffset))) >> det_dataoffset);
+	}
+
+	printf("\n");
+}
+
+int
+jedec_exp_detect( bus_t *bus, uint32_t adr, cfi_array_t **cfi_array )
+{
+	/* Temporary containers for manufacturer and device id while
+	   probing with different Autoselect methods. */
+	int ba, bw;
+	int det_buswidth;
+	bus_area_t area;
+	
+	*cfi_array = calloc( 1, sizeof (cfi_array_t) );
+	if (!*cfi_array)
+		return -2;              /* out of memory */
+	
+	(*cfi_array)->bus = bus;
+	(*cfi_array)->address = adr;
+	if (bus_area( bus, adr, &area ) != 0)
+		return -8;		/* bus width detection failed */
+	bw = area.width;
+
+	if (bw == 0) bw = 32; // autodetection!
+
+	if (bw != 8 && bw != 16 && bw != 32)
+		return -3;              /* invalid bus width */
+	(*cfi_array)->bus_width = ba = bw / 8;
+
+	(*cfi_array)->cfi_chips = calloc( 1, sizeof (cfi_chip_t *) );
+	if (!(*cfi_array)->cfi_chips)
+		return -2;              /* out of memory */
+	
+	(*cfi_array)->cfi_chips[0] = calloc( 1, sizeof (cfi_chip_t) );
+	if (!(*cfi_array)->cfi_chips[0])
+		return -2;              /* out of memory */
+
+	printf("=== experimental extensive JEDEC brute-force autodetection ===\n");
+	for(det_buswidth = bw; det_buswidth >= 8; det_buswidth >>= 1)
+	{
+		int det_datawidth;
+		printf("- trying with cpu buswidth %d\n", det_buswidth);
+		for(det_datawidth = det_buswidth; det_datawidth >= 8; det_datawidth >>= 1)
+		{
+			int det_dataoffset;
+  			printf("-- trying with flash datawidth %d\n", det_datawidth);
+			for(det_dataoffset = 0; det_dataoffset + det_datawidth <= det_buswidth; det_dataoffset += 8)
+			{
+				int det_addroffset;
+				uint32_t dmask = bits(det_dataoffset, det_datawidth+det_dataoffset-1);
+				uint32_t pata = ~dmask | ( 0xAA << det_dataoffset );
+				uint32_t patb = ~dmask | ( 0x55 << det_dataoffset );
+				uint32_t dcmd = ~dmask | ( 0x90 << det_dataoffset );
+
+	  			printf("--- trying with flash dataoffset %d", det_dataoffset);
+				printf(" using %08X, %08X and %08X)\n", pata, patb, dcmd);
+
+				for(det_addroffset = 0; det_addroffset <= 2; det_addroffset++)
+				{
+					jedec_exp_read_id(bus,adr,dmask,pata,patb,dcmd,det_addroffset,det_dataoffset,0x5555);
+					jedec_exp_read_id(bus,adr,dmask,pata,patb,dcmd,det_addroffset,det_dataoffset,0x0555);
+				}
+			}
+		}
+	}
+	printf("=== end of experimental extensive JEDEC brute-force autodetection ===\n");
+	
+	return 1;
+}
+