sst39sf020 support
Corresponding to coreboot v1 svn r524.
diff --git a/sst39sf020.c b/sst39sf020.c
new file mode 100644
index 0000000..3c310a7
--- /dev/null
+++ b/sst39sf020.c
@@ -0,0 +1,163 @@
+/*
+ * sst39sf020.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_39sf020 (volatile char * bios)
+{
+ /* ask compiler not to optimize this */
+ volatile unsigned char tmp;
+
+ tmp = *(volatile unsigned char *) (bios + 0x1823);
+ tmp = *(volatile unsigned char *) (bios + 0x1820);
+ tmp = *(volatile unsigned char *) (bios + 0x1822);
+ tmp = *(volatile unsigned char *) (bios + 0x0418);
+ tmp = *(volatile unsigned char *) (bios + 0x041B);
+ tmp = *(volatile unsigned char *) (bios + 0x0419);
+ tmp = *(volatile unsigned char *) (bios + 0x040A);
+}
+
+static __inline__ void unprotect_39sf020 (volatile char * bios)
+{
+ /* ask compiler not to optimize this */
+ volatile unsigned char tmp;
+
+ tmp = *(volatile unsigned char *) (bios + 0x1823);
+ tmp = *(volatile unsigned char *) (bios + 0x1820);
+ tmp = *(volatile unsigned char *) (bios + 0x1822);
+ tmp = *(volatile unsigned char *) (bios + 0x0418);
+ tmp = *(volatile unsigned char *) (bios + 0x041B);
+ tmp = *(volatile unsigned char *) (bios + 0x0419);
+ tmp = *(volatile unsigned char *) (bios + 0x041A);
+}
+
+static __inline__ erase_sector_39sf020 (volatile 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_39sf020(volatile char * bios, unsigned char * src,
+ volatile unsigned char * dst, unsigned int page_size)
+{
+ int i;
+ volatile char *Temp;
+
+ 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;
+ }
+ Temp = (bios + 0x5555);
+ *Temp = 0xAA;
+ Temp = bios + 0x2AAA;
+ *Temp = 0x55;
+ Temp = bios + 0x5555;
+ *Temp = 0xA0;
+ *dst++ = *src++;
+ toggle_ready_jedec(bios);
+ }
+}
+
+int probe_39sf020 (struct flashchip * flash)
+{
+ volatile char * bios = flash->virt_addr;
+ unsigned char id1, id2;
+
+ *(volatile char *) (bios + 0x5555) = 0xAA;
+ myusec_delay(10);
+ *(volatile char *) (bios + 0x2AAA) = 0x55;
+ myusec_delay(10);
+ *(volatile char *) (bios + 0x5555) = 0x90;
+
+ myusec_delay(10);
+
+ id1 = *(volatile unsigned char *) bios;
+ id2 = *(volatile unsigned char *) (bios + 0x01);
+
+ *(volatile char *) (bios + 0x5555) = 0xAA;
+ *(volatile char *) (bios + 0x2AAA) = 0x55;
+ *(volatile char *) (bios + 0x5555) = 0xF0;
+
+ myusec_delay(10);
+
+ printf(__FUNCTION__ "id1 %d, id2 %d\n", id1, id2);
+ if (id1 == flash->manufacture_id && id2 == flash->model_id)
+ return 1;
+
+ return 0;
+}
+
+int erase_39sf020 (struct flashchip * flash)
+{
+ volatile char * bios = flash->virt_addr;
+
+ unprotect_39sf020 (bios);
+ *bios = CHIP_ERASE;
+ *bios = CHIP_ERASE;
+ protect_39sf020 (bios);
+
+ myusec_delay(10);
+ toggle_ready_jedec(bios);
+}
+
+int write_39sf020 (struct flashchip * flash, char * buf)
+{
+ int i;
+ int total_size = flash->total_size * 1024, page_size = flash->page_size;
+ volatile char * bios = flash->virt_addr;
+
+// unprotect_39sf020 (bios);
+
+ printf ("Programming Page: ");
+ for (i = 0; i < total_size/page_size; i++) {
+ /* erase the page before programming */
+ //erase_sector_39sf020(bios, i * page_size);
+
+ /* write to the sector */
+ printf ("%04d at address: 0x%08x", i, i * page_size);
+ write_sector_39sf020(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_39sf020 (bios);
+}