Add dedicated chip erase function for SST49LF040

Corresponding to flashrom svn r31 and coreboot v2 svn r1852.

flash_rom.c

@@ -66,7 +66,7 @@ struct flashchip flashchips[] = {
 	{"SST39VF020",	SST_ID,		SST_39VF020,	NULL, 256, 4096,
 	 probe_jedec,	erase_chip_jedec, write_39sf020,NULL},
 	{"SST49LF040",	SST_ID,		SST_49LF040, 	NULL, 512, 4096,
-	 probe_jedec, 	erase_chip_jedec, write_49lf040,NULL},
+	 probe_jedec, 	erase_49lf040, write_49lf040,NULL},
 	{"SST49LF080A",	SST_ID,		SST_49LF080A,	NULL, 1024, 4096,
 	 probe_jedec,	erase_chip_jedec, write_49lf040,NULL},
 	{"SST49LF002A/B", SST_ID,	SST_49LF002A,	NULL, 256, 16 * 1024,

sst49lf040.c

@@ -30,6 +30,21 @@
 #include "jedec.h"
 #include "sst49lf040.h"
 
+int erase_49lf040(struct flashchip *flash)
+{
+        int i;
+        int total_size = flash->total_size * 1024;
+        int page_size = flash->page_size;
+        volatile char *bios = flash->virt_addr;
+
+        for (i = 0; i < total_size / page_size; i++) {
+		/* Chip erase only works in parallel programming mode
+		 * for the 49lf040. Use sector-erase instead */
+		erase_sector_jedec(bios, i * page_size);
+	}         
+	return 0;
+}
+
 int write_49lf040(struct flashchip *flash, unsigned char *buf)
 {
 	int i;
@@ -40,8 +55,8 @@ int write_49lf040(struct flashchip *flash, unsigned char *buf)
 	printf("Programming Page: ");
 	for (i = 0; i < total_size / page_size; i++) {
 		/* erase the page before programming
-		 * Chip erase only works in parallel programming mode for the 49lf040.
-		 * Use sector-erase instead */
+		 * Chip erase only works in parallel programming mode
+		 * for the 49lf040. Use sector-erase instead */
 		erase_sector_jedec(bios, i * page_size);
 
 		/* write to the sector */

sst49lf040.h

 #ifndef __SST49LF040_H__
 #define __SST49LF040_H__ 1
 
+extern int erase_49lf040(struct flashchip *flash);
 extern int write_49lf040(struct flashchip *flash, unsigned char *buf);
 
 #endif				/* !__SST49LF040_H__ */