Add continuation ID support to jedec.c

The continuation ID code does not go further than checking for IDs of
the type 0x7fXX, but does this for vendor and product ID. The current
published JEDEC spec has a list where the largest vendor ID is 7 bytes
long, but all leading bytes are 0x7f. The list will grow in the future,
and using a 64bit variable will not be enough anymore.
Besides that, it seems that the location of the ID byte after the first
continuation ID byte is very vendor specific, so we may have to revisit
that code some time in the future.

(Suggestion for a new encoding:
Use a two-byte data type for the ID, the lower byte contains the only
non-0x7f byte, the upper byte contains the number of 0x7f bytes used as
prefix, which is the bank number minus 1 the vendor ID appears in.)

Add support for EON EN29F002AT.

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Corey Osgood <corey.osgood@gmail.com>


git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3030 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

1 files changed, 85 insertions, 0 deletions

diff --git a/util/flashrom/en29f002a.c b/util/flashrom/en29f002a.c
new file mode 100644
index 0000000000..e2b4f9b09b
--- /dev/null
+++ b/util/flashrom/en29f002a.c
@@ -0,0 +1,85 @@
+/*
+ * This file is part of the flashrom project.
+ *
+ * Copyright (C) 2007 Carl-Daniel Hailfinger
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+ */
+
+/*
+   EN29F512 has 1C,21
+   EN29F010 has 1C,20
+   EN29F040A has 1C,04
+   EN29LV010 has 1C,6E and uses short F0 reset sequence
+   EN29LV040(A) has 1C,4F and uses short F0 reset sequence
+ */
+int probe_en29f512(struct flashchip *flash)
+{
+	volatile uint8_t *bios = flash->virtual_memory;
+	uint8_t id1, id2;
+
+	*(volatile uint8_t *)(bios + 0x555) = 0xAA;
+	*(volatile uint8_t *)(bios + 0x2AA) = 0x55;
+	*(volatile uint8_t *)(bios + 0x555) = 0x90;
+
+	myusec_delay(10);
+
+	id1 = *(volatile uint8_t *)(bios + 0x100);
+	id2 = *(volatile uint8_t *)(bios + 0x101);
+
+	/* exit by writing F0 anywhere? or the code below */
+	*(volatile uint8_t *)(bios + 0x555) = 0xAA;
+	*(volatile uint8_t *)(bios + 0x2AA) = 0x55;
+	*(volatile uint8_t *)(bios + 0x555) = 0xF0;
+
+	printf_debug("%s: id1 0x%x, id2 0x%x\n", __FUNCTION__, id1, id2);
+
+	if (id1 == flash->manufacture_id && id2 == flash->model_id)
+		return 1;
+
+	return 0;
+}
+
+/*
+   EN29F002AT has 1C,92
+   EN29F002AB has 1C,97
+ */
+int probe_en29f002a(struct flashchip *flash)
+{
+	volatile uint8_t *bios = flash->virtual_memory;
+	uint8_t id1, id2;
+
+	*(volatile uint8_t *)(bios + 0x555) = 0xAA;
+	*(volatile uint8_t *)(bios + 0xAAA) = 0x55;
+	*(volatile uint8_t *)(bios + 0x555) = 0x90;
+
+	myusec_delay(10);
+
+	id1 = *(volatile uint8_t *)(bios + 0x100);
+	id2 = *(volatile uint8_t *)(bios + 0x101);
+
+	/* exit by writing F0 anywhere? or the code below */
+	*(volatile uint8_t *)(bios + 0x555) = 0xAA;
+	*(volatile uint8_t *)(bios + 0xAAA) = 0x55;
+	*(volatile uint8_t *)(bios + 0x555) = 0xF0;
+
+	printf_debug("%s: id1 0x%x, id2 0x%x\n", __FUNCTION__, id1, id2);
+
+	if (id1 == flash->manufacture_id && id2 == flash->model_id)
+		return 1;
+
+	return 0;
+}
+