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Support for the Winbond W39V080FA series of chips. Support for flashing
on the Kontron 986LCD-M board.

Corresponding to flashrom svn r214 and coreboot v2 svn r3166.
Signed-off-by: Stefan Reinauer <stepan@coresystems.de>
Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>

w39v080fa.c

+/*
+ * This file is part of the flashrom project.
+ *
+ * Copyright (C) 2008 coresystems GmbH
+ *
+ * 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"
+
+int probe_winbond_fwhub(struct flashchip *flash)
+{
+	volatile uint8_t *bios = flash->virtual_memory;
+	uint8_t vid, did;
+
+	/* Product Identification Entry */
+	*(volatile uint8_t *)(bios + 0x5555) = 0xAA;
+	*(volatile uint8_t *)(bios + 0x2AAA) = 0x55;
+	*(volatile uint8_t *)(bios + 0x5555) = 0x90;
+	myusec_delay(10);
+
+	/* Read product ID */
+	vid = *(volatile uint8_t *)bios;
+	did = *(volatile uint8_t *)(bios + 0x01);
+
+	/* Product Identifixation Exit */
+	*(volatile uint8_t *)(bios + 0x5555) = 0xAA;
+	*(volatile uint8_t *)(bios + 0x2AAA) = 0x55;
+	*(volatile uint8_t *)(bios + 0x5555) = 0xF0;
+	myusec_delay(10);
+
+	printf_debug("%s: vid 0x%x, did 0x%x\n", __FUNCTION__, vid, did);
+
+	if (vid != flash->manufacture_id || did != flash->model_id)
+		return 0;
+
+	map_flash_registers(flash);
+
+	return 1;
+}
+
+static int unlock_block_winbond_fwhub(struct flashchip *flash, int offset)
+{
+	volatile uint8_t *wrprotect = flash->virtual_registers + offset + 2;
+	uint8_t locking;
+
+	printf_debug("Trying to unlock block @0x%08x = 0x%02x\n", offset, *wrprotect);
+
+	locking = *wrprotect;
+	switch (locking & 0x7 ) {
+	case 0:
+		printf_debug("Full Access.\n");
+		return 0;
+	case 1:
+		printf_debug("Write Lock (Default State).\n");
+		*wrprotect = 0;
+		return 0;
+	case 2:
+		printf_debug("Locked Open (Full Access, Lock Down).\n");
+		return 0;
+	case 3:
+		fprintf(stderr, "Error: Write Lock, Locked Down.\n");
+		return -1;
+	case 4:
+		printf_debug("Read Lock.\n");
+		*wrprotect = 0;
+		return 0;
+	case 5:
+		printf_debug("Read/Write Lock.\n");
+		*wrprotect = 0;
+		return 0;
+	case 6:
+		fprintf(stderr, "Error: Read Lock, Locked Down.\n");
+		return -1;
+	case 7:
+		fprintf(stderr, "Error: Read/Write Lock, Locked Down.\n");
+		return -1;
+	}
+
+	/* We will never reach this point, but GCC doesn't know */
+	return -1;
+}
+
+int unlock_winbond_fwhub(struct flashchip *flash)
+{
+	int i, total_size = flash->total_size * 1024;
+	volatile uint8_t *bios = flash->virtual_memory;
+	uint8_t locking;
+	
+	/* Are there any hardware restrictions that we can't overcome? 
+	 * If flashrom fail here, someone's got to check all those GPIOs.
+	 */
+
+	/* Product Identification Entry */
+	*(volatile uint8_t *)(bios + 0x5555) = 0xAA;
+	*(volatile uint8_t *)(bios + 0x2AAA) = 0x55;
+	*(volatile uint8_t *)(bios + 0x5555) = 0x90;
+	myusec_delay(10);
+
+	/* Read Hardware Lock Bits */
+	locking = *(volatile uint8_t *)(bios + 0xffff2);
+
+	/* Product Identification Exit */
+	*(volatile uint8_t *)(bios + 0x5555) = 0xAA;
+	*(volatile uint8_t *)(bios + 0x2AAA) = 0x55;
+	*(volatile uint8_t *)(bios + 0x5555) = 0xF0;
+	myusec_delay(10);
+
+	printf_debug("Lockout bits:\n");
+
+	if (locking & (1<<2))
+		fprintf(stderr, "Error: hardware bootblock locking (#TBL).\n");
+	else
+		printf_debug("No hardware bootblock locking (good!)\n");
+
+	if (locking & (1<<3))
+		fprintf(stderr, "Error: hardware block locking (#WP).\n");
+	else
+		printf_debug("No hardware block locking (good!)\n");
+
+	if (locking & ((1<<2) | (1<<3)))
+		return -1;
+
+	/* Unlock the complete chip */
+	for (i = 0; i < total_size; i += flash->page_size)
+		if (unlock_block_winbond_fwhub(flash, i))
+			return -1;
+
+	return 0;
+}
+
+static int erase_sector_winbond_fwhub(volatile uint8_t *bios, unsigned int sector)
+{
+	/* Remember: too much sleep can waste your day. */
+
+	printf("0x%08x\b\b\b\b\b\b\b\b\b\b", sector);
+
+	/* Sector Erase */
+	*(volatile uint8_t *)(bios + 0x5555) = 0xAA;
+	*(volatile uint8_t *)(bios + 0x2AAA) = 0x55;
+	*(volatile uint8_t *)(bios + 0x5555) = 0x80;
+
+	*(volatile uint8_t *)(bios + 0x5555) = 0xAA;
+	*(volatile uint8_t *)(bios + 0x2AAA) = 0x55;
+	*(volatile uint8_t *)(bios + sector) = 0x30;
+
+	/* wait for Toggle bit ready */
+	toggle_ready_jedec(bios);
+
+	return 0;
+}
+
+int erase_winbond_fwhub(struct flashchip *flash)
+{
+	int i, total_size = flash->total_size * 1024;
+	volatile uint8_t *bios = flash->virtual_memory;
+	
+	printf("Erasing:     ");
+
+	for (i = 0; i < total_size; i += flash->page_size)
+		erase_sector_winbond_fwhub(bios, i);
+
+	printf("\n");
+
+	for (i = 0; i < total_size; i++) {
+		if (bios[i] != 0xff) {
+			fprintf(stderr, "Error: Flash chip erase failed at 0x%08x(0x%02x)\n", i, bios[i]);
+			return -1;
+		}
+	}
+
+	return 0;
+}
+
+int write_winbond_fwhub(struct flashchip *flash, uint8_t *buf)
+{
+	int i;
+	int total_size = flash->total_size * 1024;
+	volatile uint8_t *bios = flash->virtual_memory;
+
+	if (erase_winbond_fwhub(flash))
+		return -1;
+
+	printf("Programming: ");
+	for (i = 0; i < total_size; i+=flash->page_size) {
+		printf("0x%08x\b\b\b\b\b\b\b\b\b\b", i);
+		write_sector_jedec(bios, buf + i, bios + i, flash->page_size);
+	}
+	printf("\n");
+
+	return 0;
+}
+