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>

5 files changed, 121 insertions, 58 deletions

diff --git a/Makefile b/Makefile
index 35b891db1..a645d4c56 100644
--- a/Makefile
+++ b/Makefile
@@ -22,7 +22,7 @@ endif
 
 OBJS = chipset_enable.o board_enable.o udelay.o jedec.o stm50flw0x0x.c \
 	sst28sf040.o am29f040b.o mx29f002.o sst39sf020.o m29f400bt.o \
-	w49f002u.o 82802ab.o msys_doc.o pm49fl004.o sst49lf040.o \
+	w49f002u.o 82802ab.o msys_doc.o pm49fl00x.o sst49lf040.o \
 	sst49lfxxxc.o sst_fwhub.o layout.o cbtable.o flashchips.o \
 	flashrom.o w39v080fa.o sharplhf00l04.o w29ee011.o spi.o it87spi.o \
 	ichspi.o
diff --git a/flash.h b/flash.h
index 673643f7e..a3740ee63 100644
--- a/flash.h
+++ b/flash.h
@@ -453,10 +453,10 @@ int probe_29f002(struct flashchip *flash);
 int erase_29f002(struct flashchip *flash);
 int write_29f002(struct flashchip *flash, uint8_t *buf);
 
-/* pm49fl004.c */
-int probe_49fl004(struct flashchip *flash);
-int erase_49fl004(struct flashchip *flash);
-int write_49fl004(struct flashchip *flash, uint8_t *buf);
+/* pm49fl00x.c */
+int probe_49fl00x(struct flashchip *flash);
+int erase_49fl00x(struct flashchip *flash);
+int write_49fl00x(struct flashchip *flash, uint8_t *buf);
 
 /* sharplhf00l04.c */
 int probe_lhf00l04(struct flashchip *flash);
diff --git a/flashchips.c b/flashchips.c
index 50a498da1..eeb4a8a0b 100644
--- a/flashchips.c
+++ b/flashchips.c
@@ -64,8 +64,8 @@ struct flashchip flashchips[] = {
 	{"PMC",		"Pm25LV040",		PMC_ID,		PMC_25LV040,		512,	256,		TEST_UNTESTED,	probe_spi_rdid,		spi_chip_erase_c7,	spi_chip_write,	spi_chip_read},
 	{"PMC",		"Pm25LV080B",		PMC_ID,		PMC_25LV080B,		1024,	256,		TEST_UNTESTED,	probe_spi_rdid,		spi_chip_erase_c7,	spi_chip_write,	spi_chip_read},
 	{"PMC",		"Pm25LV512",		PMC_ID,		PMC_25LV512,		64,	256,		TEST_UNTESTED,	probe_spi_rdid,		spi_chip_erase_c7,	spi_chip_write,	spi_chip_read},
-	{"PMC",		"Pm49FL002",		PMC_ID_NOPREFIX,PMC_49FL002,		256,	16 * 1024,	TEST_UNTESTED,	probe_jedec,		erase_chip_jedec,		write_49fl004},
-	{"PMC",		"Pm49FL004",		PMC_ID_NOPREFIX,PMC_49FL004,		512,	64 * 1024,	TEST_UNTESTED,	probe_jedec,		erase_chip_jedec,		write_49fl004},
+	{"PMC",		"Pm49FL002",		PMC_ID_NOPREFIX,PMC_49FL002,		256,	16 * 1024,	TEST_UNTESTED,	probe_49fl00x,		erase_49fl00x,		write_49fl00x},
+	{"PMC",		"Pm49FL004",		PMC_ID_NOPREFIX,PMC_49FL004,		512,	64 * 1024,	TEST_OK_PREW,	probe_49fl00x,		erase_49fl00x,		write_49fl00x},
 	{"Sharp",	"LHF00L04",		SHARP_ID,	SHARP_LHF00L04,		1024,	64 * 1024,	TEST_UNTESTED,	probe_lhf00l04,		erase_lhf00l04,			write_lhf00l04},
 	{"Spansion",	"S25FL016A",		SPANSION_ID,	SPANSION_S25FL016A,	2048,	256,		TEST_UNTESTED,	probe_spi_rdid,		spi_chip_erase_c7,	spi_chip_write,	spi_chip_read},
 	{"SST",		"SST25VF016B",		SST_ID,		SST_25VF016B,		2048,	256,		TEST_UNTESTED,	probe_spi_rdid,		spi_chip_erase_c7,	spi_chip_write,	spi_chip_read},
diff --git a/pm49fl004.c b/pm49fl004.c
deleted file mode 100644
index e5fcd6667..000000000
--- a/pm49fl004.c
+++ /dev/null
@@ -1,51 +0,0 @@
-/*
- * This file is part of the flashrom project.
- *
- * Copyright (C) 2004 Tyan 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
- */
-
-#include <stdio.h>
-#include "flash.h"
-
-extern int exclude_start_page, exclude_end_page;
-
-int write_49fl004(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;
-
-	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");
-
-	return 0;
-}
diff --git a/pm49fl00x.c b/pm49fl00x.c
new file mode 100644
index 000000000..ed2fed090
--- /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;
+}