Support Pm49FL004/2 Block Locking Registers

The PMC chips understand both LPC and FWH flash commands. When in FWH mode
(MSR_DIVIL_BALL_OPT(0x51400015) = 0x00000f7d on 5536 boards) the Block
Locking Registers by default lock the flash chip for write and erase - in
addition to any chipset write protection.

This patch adds unlock operations before Pm49FL004/2 write and erase, and
it includes an svn mv pm49fl004.c pm49fl00x.c

Thanks go to Nikolay for this patch.

Corresponding to flashrom svn r243 and coreboot v2 svn r3332.

Signed-off-by: Nikolay Petukhov <nikolay.petukhov@gmail.com>
Signed-off-by: Peter Stuge <peter@stuge.se>
Acked-by: Bari Ari <bari@onelabs.com>

1 files changed, 114 insertions, 0 deletions

diff --git a/pm49fl00x.c b/pm49fl00x.c
new file mode 100644
index 0000000..ed2fed0
--- /dev/null
+++ b/pm49fl00x.c
@@ -0,0 +1,114 @@
+/*
+ * This file is part of the flashrom project.
+ *
+ * Copyright (C) 2004 Tyan Corporation
+ * Copyright (C) 2007 Nikolay Petukhov <nikolay.petukhov@gmail.com>
+ * Copyright (C) 2007 Reinder E.N. de Haan <lb_reha@mveas.com>
+ *
+ * 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
+ */
+
+#include <stdio.h>
+#include "flash.h"
+
+extern int exclude_start_page, exclude_end_page;
+
+void write_lockbits_49fl00x(volatile uint8_t *bios, int size,
+					      unsigned char bits, int block_size)
+{
+	int i, left = size;
+
+	for (i = 0; left >= block_size; i++, left -= block_size) {
+
+		/* pm49fl002 */
+		if (block_size == 16384 && i%2)
+			continue;
+
+		*(bios + (i * block_size) + 2) = bits;
+	}
+}
+
+int probe_49fl00x(struct flashchip *flash)
+{
+	int ret = probe_jedec(flash);
+	
+	if (ret == 1)
+		map_flash_registers(flash);
+
+	return ret;
+}
+
+int erase_49fl00x(struct flashchip *flash)
+{
+	int i;
+	int total_size = flash->total_size * 1024;
+	int page_size = flash->page_size;
+	volatile uint8_t *bios = flash->virtual_memory;
+
+	/* unprotected */
+	write_lockbits_49fl00x(flash->virtual_registers, total_size, 0, page_size);
+
+	//erase_chip_jedec will not work ... datasheet says "Chip erase is available in A/A Mux Mode only"
+	printf("Erasing page: ");
+	for (i = 0; i < total_size / page_size; i++) {
+		if ((i >= exclude_start_page) && (i < exclude_end_page))
+			continue;
+
+		/* erase the page */
+		erase_block_jedec(bios, i * page_size);
+		printf("%04d at address: 0x%08x", i, i * page_size);
+		printf("\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b");
+		fflush(stdout);
+	}
+	printf("\n");
+
+	/* protected */
+	write_lockbits_49fl00x(flash->virtual_registers, total_size, 1, page_size);
+
+	return 0;
+}
+
+int write_49fl00x(struct flashchip *flash, uint8_t *buf)
+{
+	int i;
+	int total_size = flash->total_size * 1024;
+	int page_size = flash->page_size;
+	volatile uint8_t *bios = flash->virtual_memory;
+
+	/* unprotected */
+	write_lockbits_49fl00x(flash->virtual_registers, total_size, 0, page_size);
+
+	printf("Programming page: ");
+	for (i = 0; i < total_size / page_size; i++) {
+		if ((i >= exclude_start_page) && (i < exclude_end_page))
+			continue;
+
+		/* erase the page before programming */
+		erase_block_jedec(bios, i * page_size);
+
+		/* write to the sector */
+		printf("%04d at address: 0x%08x", i, i * page_size);
+		write_sector_jedec(bios, buf + i * page_size,
+				   bios + i * page_size, page_size);
+		printf("\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b");
+		fflush(stdout);
+	}
+	printf("\n");
+	
+	/* protected */
+	write_lockbits_49fl00x(flash->virtual_registers, total_size, 1, page_size);
+
+	return 0;
+}