diff options
Diffstat (limited to 'util/flash_and_burn/am29f040b.c')
-rw-r--r-- | util/flash_and_burn/am29f040b.c | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/util/flash_and_burn/am29f040b.c b/util/flash_and_burn/am29f040b.c new file mode 100644 index 0000000000..89cdff9806 --- /dev/null +++ b/util/flash_and_burn/am29f040b.c @@ -0,0 +1,130 @@ +/* + * am29f040.c: driver for programming AMD am29f040b 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: + * AMD Am29F040B data sheet + * $Id$ + */ + +#include <stdio.h> +#include "flash.h" +#include "jedec.h" + +static __inline__ int erase_sector_29f040b (volatile char * bios, unsigned long address) +{ + *(bios + 0x555) = 0xAA; + *(bios + 0x2AA) = 0x55; + *(bios + 0x555) = 0x80; + *(bios + 0x555) = 0xAA; + *(bios + 0x2AA) = 0x55; + *(bios + address) = 0x30; + + sleep(2); + + /* wait for Toggle bit ready */ + toggle_ready_jedec(bios + address); + + return(0); +} + +static __inline__ int write_sector_29f040b(volatile char * bios, unsigned char * src, + volatile unsigned char * dst, unsigned int page_size) +{ + int i; + + for (i = 0; i < page_size; i++) { + printf("0x%08lx", (unsigned long) dst - (unsigned long) bios); + + *(bios + 0x555) = 0xAA; + *(bios + 0x2AA) = 0x55; + *(bios + 0x555) = 0xA0; + *dst++ = *src++; + + /* wait for Toggle bit ready */ + toggle_ready_jedec(bios); + + printf("\b\b\b\b\b\b\b\b\b\b"); + } + + return(0); +} + +int probe_29f040b (struct flashchip * flash) +{ + volatile char * bios = flash->virt_addr; + unsigned char id1, id2; + + *(bios + 0x555) = 0xAA; + *(bios + 0x2AA) = 0x55; + *(bios + 0x555) = 0x90; + + id1 = *(unsigned char *) bios; + id2 = *(unsigned char *) (bios + 0x01); + + *bios = 0xF0; + + myusec_delay(10); + + printf("%s: id1 0x%x, id2 0x%x\n", __FUNCTION__, id1, id2); + if (id1 == flash->manufacture_id && id2 == flash->model_id) + return 1; + + return 0; +} + +int erase_29f040b (struct flashchip * flash) +{ + volatile char * bios = flash->virt_addr; + + *(bios + 0x555) = 0xAA; + *(bios + 0x2AA) = 0x55; + *(bios + 0x555) = 0x80; + *(bios + 0x555) = 0xAA; + *(bios + 0x2AA) = 0x55; + *(bios + 0x555) = 0x10; + + myusec_delay(10); + toggle_ready_jedec(bios); + + return(0); +} + +int write_29f040b (struct flashchip * flash, unsigned char * buf) +{ + int i; + int total_size = flash->total_size * 1024, page_size = flash->page_size; + volatile char * bios = flash->virt_addr; + + printf ("Programming Page: "); + for (i = 0; i < total_size/page_size; i++) { + /* erase the page before programming */ + erase_sector_29f040b(bios, i * page_size); + + /* write to the sector */ + printf ("%04d at address: ", i); + write_sector_29f040b(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"); + } + printf("\n"); + + return(0); +} |