/* * jedec.c: driver for programming JEDEC standard flash parts * * * 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: * * $Id$ */ #include "flash.h" #include "jedec.h" int probe_jedec (struct flashchip * flash) { volatile char * bios = flash->virt_addr; unsigned char id1, id2; *(volatile char *) (bios + 0x5555) = 0xAA; *(volatile char *) (bios + 0x2AAA) = 0x55; *(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_jedec (struct flashchip * flash) { volatile char * bios = flash->virt_addr; *(volatile char *) (bios + 0x5555) = 0xAA; *(volatile char *) (bios + 0x2AAA) = 0x55; *(volatile char *) (bios + 0x5555) = 0x80; *(volatile char *) (bios + 0x5555) = 0xAA; *(volatile char *) (bios + 0x2AAA) = 0x55; *(volatile char *) (bios + 0x5555) = 0x10; myusec_delay(10); toggle_ready_jedec(bios); } int write_jedec (struct flashchip * flash, char * buf) { int i; int total_size = flash->total_size *1024, page_size = flash->page_size; volatile unsigned char * bios = flash->virt_addr; erase_jedec (flash); if (*bios != (unsigned char ) 0xff) { printf("ERASE FAILED\n"); return -1; } printf ("Programming Page: "); for (i = 0; i < total_size/page_size; i++) { printf ("%04d at address: 0x%08x", i, i * page_size); write_page_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"); } printf("\n"); protect_jedec (bios); }