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authorAndrew Ip <aip@cwlinux.com>2002-10-16 06:58:05 +0000
committerAndrew Ip <aip@cwlinux.com>2002-10-16 06:58:05 +0000
commitf0126ce251a047443352f11e07a46f2cdabe2713 (patch)
tree727b4729649c87a7fc4d6975283985f4afc9f6f2 /w49f002u.c
parent56439427500146bf125b081406275be55fa5d9e3 (diff)
downloadast2050-flashrom-f0126ce251a047443352f11e07a46f2cdabe2713.zip
ast2050-flashrom-f0126ce251a047443352f11e07a46f2cdabe2713.tar.gz
Add w49f002u support
Corresponding to coreboot v1 svn r643.
Diffstat (limited to 'w49f002u.c')
-rw-r--r--w49f002u.c112
1 files changed, 112 insertions, 0 deletions
diff --git a/w49f002u.c b/w49f002u.c
new file mode 100644
index 0000000..887a15b
--- /dev/null
+++ b/w49f002u.c
@@ -0,0 +1,112 @@
+/*
+ * w49f002u.c: driver for Winbond 49F002U 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:
+ * W49F002U data sheet
+ *
+ * $Id
+ */
+
+#include "flash.h"
+#include "jedec.h"
+
+int probe_49f002 (struct flashchip * flash)
+{
+ volatile char * bios = flash->virt_addr;
+ unsigned char id1, id2, id3;
+
+ *(bios + 0x5555) = 0xAA;
+ *(bios + 0x2AAA) = 0x55;
+ *(bios + 0x5555) = 0x90;
+
+ id1 = *(volatile unsigned char *) bios;
+ id2 = *(volatile unsigned char *) (bios + 0x01);
+
+ *bios = 0xF0;
+
+ myusec_delay(10);
+
+ printf(__FUNCTION__ "id1 %d, id2 %d\n", id1, id2);
+ if (id1 == flash->manufacture_id && id2 == flash->model_id)
+ return 1;
+
+ return 0;
+}
+
+int erase_49f002 (struct flashchip * flash)
+{
+ volatile char * bios = flash->virt_addr;
+
+ again:
+ *(bios + 0x5555) = 0xAA;
+ *(bios + 0x2AAA) = 0x55;
+ *(bios + 0x5555) = 0x80;
+ *(bios + 0x5555) = 0xAA;
+ *(bios + 0x2AAA) = 0x55;
+ *(bios + 0x5555) = 0x10;
+
+ myusec_delay(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_49f002 (struct flashchip * flash, char * buf)
+{
+ int i;
+ int total_size = flash->total_size * 1024, page_size = flash->page_size;
+ volatile char * bios = flash->virt_addr;
+ volatile char * dst = bios, * src = buf;
+
+ *bios = 0xF0;
+ myusec_delay(10);
+ erase_49f002(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++ = *buf++;
+
+ /* 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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