From 5e5f75e559f605974afd3767bc650a1cc0ed6f1f Mon Sep 17 00:00:00 2001
From: "Ronald G. Minnich" <rminnich@gmail.com>
Date: Tue, 29 Jan 2002 18:21:41 +0000
Subject: Trying to make this general purpose user-land flash burner

Corresponding to coreboot v1 svn r489.
---
 mx29f002.c | 112 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 112 insertions(+)
 create mode 100644 mx29f002.c

(limited to 'mx29f002.c')

diff --git a/mx29f002.c b/mx29f002.c
new file mode 100644
index 0000000..e5c2c08
--- /dev/null
+++ b/mx29f002.c
@@ -0,0 +1,112 @@
+/*
+ * mx29f002.c: driver for MXIC MX29F002 flash models
+ *
+ *
+ * Copyright 2000 Silicon Integrated System Corporation
+ *
+ *	This program is free software; you can redistribute it and/or modify
+ *	it under the terms of the GNU General Public License as published by
+ *	the Free Software Foundation; either version 2 of the License, or
+ *	(at your option) any later version.
+ *
+ *	This program is distributed in the hope that it will be useful,
+ *	but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *	GNU General Public License for more details.
+ *
+ *	You should have received a copy of the GNU General Public License
+ *	along with this program; if not, write to the Free Software
+ *	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *
+ * Reference:
+ *	MX29F002/002N data sheet
+ *
+ * $Id$
+ */
+
+#include "flash.h"
+#include "jedec.h"
+
+int probe_29f002 (struct flashchip * flash)
+{
+	char * bios = flash->virt_addr;
+	unsigned char id1, id2, id3;
+
+	*(bios + 0x5555) = 0xAA;
+	*(bios + 0x2AAA) = 0x55;
+	*(bios + 0x5555) = 0x90;
+    
+	id1 = *(unsigned char *) bios;
+	id2 = *(unsigned char *) (bios + 0x01);
+ 
+	*bios = 0xF0;
+
+	usleep(10);
+
+	if (id1 == flash->manufacture_id && id2 == flash->model_id)
+		return 1;
+
+	return 0;
+}
+
+int erase_29f002 (struct flashchip * flash)
+{
+	char * bios = flash->virt_addr;
+
+ again:
+	*(bios + 0x555) = 0xF0;
+	*(bios + 0x555) = 0xAA;
+	*(bios + 0x2AA) = 0x55;
+	*(bios + 0x555) = 0x80;
+	*(bios + 0x555) = 0xAA;
+	*(bios + 0x2AA) = 0x55;
+	*(bios + 0x555) = 0x10;
+
+	usleep(100);
+	toggle_ready_jedec(bios);
+
+	//   while ((*bios & 0x40) != 0x40)
+	//;
+
+#if 0
+	toggle_ready_jedec(bios);
+	*(bios + 0x0ffff) = 0x30;
+	*(bios + 0x1ffff) = 0x30;
+	*(bios + 0x2ffff) = 0x30;
+	*(bios + 0x37fff) = 0x30;
+	*(bios + 0x39fff) = 0x30;
+	*(bios + 0x3bfff) = 0x30;
+#endif
+
+}
+
+int write_29f002 (struct flashchip * flash, char * buf)
+{
+    int i;
+    int total_size = flash->total_size * 1024, page_size = flash->page_size;
+    char * bios = flash->virt_addr;
+    char * dst = bios, * src = buf;
+
+    *bios = 0xF0;
+    usleep(10);
+    erase_29f002(flash);
+    //*bios = 0xF0;
+#if 1
+   printf ("Programming Page: ");
+    for (i = 0; i < total_size; i++) {
+	/* write to the sector */
+	printf ("address: 0x%08lx", i);
+	*(bios + 0x5555) = 0xAA;
+	*(bios + 0x2AAA) = 0x55;
+	*(bios + 0x5555) = 0xA0;
+	*dst++ = 0x33;
+
+	/* wait for Toggle bit ready */
+	toggle_ready_jedec(dst);
+
+	printf ("\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b");
+    }
+#endif
+    printf("\n");
+}
-- 
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