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authorRonald G. Minnich <rminnich@gmail.com>2002-01-29 18:21:41 +0000
committerRonald G. Minnich <rminnich@gmail.com>2002-01-29 18:21:41 +0000
commit5e5f75e559f605974afd3767bc650a1cc0ed6f1f (patch)
tree6923dc3d9468a6929079951532dd9fa9040637eb /sst28sf040.c
downloadast2050-flashrom-5e5f75e559f605974afd3767bc650a1cc0ed6f1f.zip
ast2050-flashrom-5e5f75e559f605974afd3767bc650a1cc0ed6f1f.tar.gz
Trying to make this general purpose user-land flash burner
Corresponding to coreboot v1 svn r489.
Diffstat (limited to 'sst28sf040.c')
-rw-r--r--sst28sf040.c159
1 files changed, 159 insertions, 0 deletions
diff --git a/sst28sf040.c b/sst28sf040.c
new file mode 100644
index 0000000..e0e5ea3
--- /dev/null
+++ b/sst28sf040.c
@@ -0,0 +1,159 @@
+/*
+ * sst28sf040.c: driver for SST28SF040C 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:
+ * 4 MEgabit (512K x 8) SuperFlash EEPROM, SST28SF040 data sheet
+ *
+ * $Id$
+ */
+
+#include "flash.h"
+#include "jedec.h"
+
+#define AUTO_PG_ERASE1 0x20
+#define AUTO_PG_ERASE2 0xD0
+#define AUTO_PGRM 0x10
+#define CHIP_ERASE 0x30
+#define RESET 0xFF
+#define READ_ID 0x90
+
+static __inline__ void protect_28sf040 (char * bios)
+{
+ /* ask compiler not to optimize this */
+ volatile unsigned char tmp;
+
+ tmp = *(unsigned char *) (bios + 0x1823);
+ tmp = *(unsigned char *) (bios + 0x1820);
+ tmp = *(unsigned char *) (bios + 0x1822);
+ tmp = *(unsigned char *) (bios + 0x0418);
+ tmp = *(unsigned char *) (bios + 0x041B);
+ tmp = *(unsigned char *) (bios + 0x0419);
+ tmp = *(unsigned char *) (bios + 0x040A);
+}
+
+static __inline__ void unprotect_28sf040 (char * bios)
+{
+ /* ask compiler not to optimize this */
+ volatile unsigned char tmp;
+
+ tmp = *(unsigned char *) (bios + 0x1823);
+ tmp = *(unsigned char *) (bios + 0x1820);
+ tmp = *(unsigned char *) (bios + 0x1822);
+ tmp = *(unsigned char *) (bios + 0x0418);
+ tmp = *(unsigned char *) (bios + 0x041B);
+ tmp = *(unsigned char *) (bios + 0x0419);
+ tmp = *(unsigned char *) (bios + 0x041A);
+}
+
+static __inline__ erase_sector_28sf040 (char * bios, unsigned long address)
+{
+ *bios = AUTO_PG_ERASE1;
+ *(bios + address) = AUTO_PG_ERASE2;
+
+ /* wait for Toggle bit ready */
+ toggle_ready_jedec(bios);
+}
+
+static __inline__ write_sector_28sf040(char * bios, unsigned char * src,
+ unsigned char * dst, unsigned int page_size)
+{
+ int i;
+
+ for (i = 0; i < page_size; i++) {
+ /* transfer data from source to destination */
+ if (*src == 0xFF) {
+ dst++, src++;
+ /* If the data is 0xFF, don't program it */
+ continue;
+ }
+ /*issue AUTO PROGRAM command */
+ *dst = AUTO_PGRM;
+ *dst++ = *src++;
+
+ /* wait for Toggle bit ready */
+ toggle_ready_jedec(bios);
+ }
+}
+
+int probe_28sf040 (struct flashchip * flash)
+{
+ char * bios = flash->virt_addr;
+ unsigned char id1, id2, tmp;
+
+ /* save the value at the beginning of the Flash */
+ tmp = *bios;
+
+ *bios = RESET;
+ usleep(10);
+
+ *bios = READ_ID;
+ usleep(10);
+ id1 = *(unsigned char *) bios;
+ usleep(10);
+ id2 = *(unsigned char *) (bios + 0x01);
+
+ *bios = RESET;
+ usleep(10);
+
+ if (id1 == flash->manufacture_id && id2 == flash->model_id)
+ return 1;
+
+ /* if there is no SST28SF040, restore the original value */
+ *bios = tmp;
+ return 0;
+}
+
+int erase_28sf040 (struct flashchip * flash)
+{
+ char * bios = flash->virt_addr;
+
+ unprotect_28sf040 (bios);
+ *bios = CHIP_ERASE;
+ *bios = CHIP_ERASE;
+ protect_28sf040 (bios);
+
+ usleep(10);
+ toggle_ready_jedec(bios);
+}
+
+int write_28sf040 (struct flashchip * flash, char * buf)
+{
+ int i;
+ int total_size = flash->total_size * 1024, page_size = flash->page_size;
+ char * bios = flash->virt_addr;
+
+ unprotect_28sf040 (bios);
+
+ printf ("Programming Page: ");
+ for (i = 0; i < total_size/page_size; i++) {
+ /* erase the page before programming */
+ erase_sector_28sf040(bios, i * page_size);
+
+ /* write to the sector */
+ printf ("%04d at address: 0x%08x", i, i * page_size);
+ write_sector_28sf040(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");
+ }
+ printf("\n");
+
+ protect_28sf040 (bios);
+}
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