diff options
Diffstat (limited to '82802ab.c')
| -rw-r--r-- | 82802ab.c | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/82802ab.c b/82802ab.c new file mode 100644 index 00000000..38a5ce29 --- /dev/null +++ b/82802ab.c @@ -0,0 +1,186 @@ +/* + * This file is part of the flashrom project. + * + * Copyright (C) 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/* + * Datasheet: + * - Name: Intel 82802AB/82802AC Firmware Hub (FWH) + * - URL: http://www.intel.com/design/chipsets/datashts/290658.htm + * - PDF: http://download.intel.com/design/chipsets/datashts/29065804.pdf + * - Order number: 290658-004 + */ + +#include <stdio.h> +#include <stdint.h> +#include "flash.h" + +// I need that Berkeley bit-map printer +void print_82802ab_status(uint8_t status) +{ + printf("%s", status & 0x80 ? "Ready:" : "Busy:"); + printf("%s", status & 0x40 ? "BE SUSPEND:" : "BE RUN/FINISH:"); + printf("%s", status & 0x20 ? "BE ERROR:" : "BE OK:"); + printf("%s", status & 0x10 ? "PROG ERR:" : "PROG OK:"); + printf("%s", status & 0x8 ? "VP ERR:" : "VPP OK:"); + printf("%s", status & 0x4 ? "PROG SUSPEND:" : "PROG RUN/FINISH:"); + printf("%s", status & 0x2 ? "WP|TBL#|WP#,ABORT:" : "UNLOCK:"); +} + +int probe_82802ab(struct flashchip *flash) +{ + volatile uint8_t *bios = flash->virtual_memory; + uint8_t id1, id2; + +#if 0 + *(volatile uint8_t *)(bios + 0x5555) = 0xAA; + *(volatile uint8_t *)(bios + 0x2AAA) = 0x55; + *(volatile uint8_t *)(bios + 0x5555) = 0x90; +#endif + + *bios = 0xff; + myusec_delay(10); + *bios = 0x90; + myusec_delay(10); + + id1 = *(volatile uint8_t *)bios; + id2 = *(volatile uint8_t *)(bios + 0x01); + + /* Leave ID mode */ + *(volatile uint8_t *)(bios + 0x5555) = 0xAA; + *(volatile uint8_t *)(bios + 0x2AAA) = 0x55; + *(volatile uint8_t *)(bios + 0x5555) = 0xF0; + + myusec_delay(10); + + printf_debug("%s: id1 0x%x, id2 0x%x\n", __FUNCTION__, id1, id2); + + if (id1 != flash->manufacture_id || id2 != flash->model_id) + return 0; + + map_flash_registers(flash); + + return 1; +} + +uint8_t wait_82802ab(volatile uint8_t *bios) +{ + uint8_t status; + uint8_t id1, id2; + + *bios = 0x70; + if ((*bios & 0x80) == 0) { // it's busy + while ((*bios & 0x80) == 0) ; + } + + status = *bios; + + // put another command to get out of status register mode + + *bios = 0x90; + myusec_delay(10); + + id1 = *(volatile uint8_t *)bios; + id2 = *(volatile uint8_t *)(bios + 0x01); + + // this is needed to jam it out of "read id" mode + *(volatile uint8_t *)(bios + 0x5555) = 0xAA; + *(volatile uint8_t *)(bios + 0x2AAA) = 0x55; + *(volatile uint8_t *)(bios + 0x5555) = 0xF0; + + return status; +} + +int erase_82802ab_block(struct flashchip *flash, int offset) +{ + volatile uint8_t *bios = flash->virtual_memory + offset; + volatile uint8_t *wrprotect = flash->virtual_registers + offset + 2; + uint8_t status; + + // clear status register + *bios = 0x50; + //printf("Erase at %p\n", bios); + // clear write protect + //printf("write protect is at %p\n", (wrprotect)); + //printf("write protect is 0x%x\n", *(wrprotect)); + *(wrprotect) = 0; + //printf("write protect is 0x%x\n", *(wrprotect)); + + // now start it + *(volatile uint8_t *)(bios) = 0x20; + *(volatile uint8_t *)(bios) = 0xd0; + myusec_delay(10); + // now let's see what the register is + status = wait_82802ab(flash->virtual_memory); + //print_82802ab_status(status); + printf("DONE BLOCK 0x%x\n", offset); + + return 0; +} + +int erase_82802ab(struct flashchip *flash) +{ + int i; + unsigned int total_size = flash->total_size * 1024; + + printf("total_size is %d; flash->page_size is %d\n", + total_size, flash->page_size); + for (i = 0; i < total_size; i += flash->page_size) + erase_82802ab_block(flash, i); + printf("DONE ERASE\n"); + + return 0; +} + +void write_page_82802ab(volatile uint8_t *bios, uint8_t *src, + volatile uint8_t *dst, int page_size) +{ + int i; + + for (i = 0; i < page_size; i++) { + /* transfer data from source to destination */ + *dst = 0x40; + *dst++ = *src++; + wait_82802ab(bios); + } +} + +int write_82802ab(struct flashchip *flash, uint8_t *buf) +{ + int i; + int total_size = flash->total_size * 1024; + int page_size = flash->page_size; + volatile uint8_t *bios = flash->virtual_memory; + + erase_82802ab(flash); + if (*bios != 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_82802ab(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); + + return 0; +} |