097e6497ab
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1255 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
131 lines
3.0 KiB
C
131 lines
3.0 KiB
C
/*
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* am29f040.c: driver for programming AMD am29f040b models
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*
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*
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* Copyright 2000 Silicon Integrated System Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*
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* Reference:
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* AMD Am29F040B data sheet
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* $Id$
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*/
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#include <stdio.h>
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#include "flash.h"
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#include "jedec.h"
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static __inline__ int erase_sector_29f040b (volatile char * bios, unsigned long address)
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{
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*(bios + 0x555) = 0xAA;
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*(bios + 0x2AA) = 0x55;
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*(bios + 0x555) = 0x80;
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*(bios + 0x555) = 0xAA;
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*(bios + 0x2AA) = 0x55;
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*(bios + address) = 0x30;
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sleep(2);
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/* wait for Toggle bit ready */
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toggle_ready_jedec(bios + address);
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return(0);
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}
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static __inline__ int write_sector_29f040b(volatile char * bios, unsigned char * src,
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volatile unsigned char * dst, unsigned int page_size)
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{
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int i;
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for (i = 0; i < page_size; i++) {
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printf("0x%08lx", (unsigned long) dst - (unsigned long) bios);
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*(bios + 0x555) = 0xAA;
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*(bios + 0x2AA) = 0x55;
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*(bios + 0x555) = 0xA0;
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*dst++ = *src++;
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/* wait for Toggle bit ready */
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toggle_ready_jedec(bios);
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printf("\b\b\b\b\b\b\b\b\b\b");
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}
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return(0);
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}
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int probe_29f040b (struct flashchip * flash)
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{
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volatile unsigned char * bios = flash->virt_addr;
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unsigned char id1, id2;
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*(bios + 0x555) = 0xAA;
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*(bios + 0x2AA) = 0x55;
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*(bios + 0x555) = 0x90;
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id1 = * bios;
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id2 = * (bios + 0x01);
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*bios = 0xF0;
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myusec_delay(10);
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printf("%s: id1 0x%x, id2 0x%x\n", __FUNCTION__, id1, id2);
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if (id1 == flash->manufacture_id && id2 == flash->model_id)
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return 1;
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return 0;
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}
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int erase_29f040b (struct flashchip * flash)
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{
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volatile unsigned char * bios = flash->virt_addr;
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*(bios + 0x555) = 0xAA;
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*(bios + 0x2AA) = 0x55;
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*(bios + 0x555) = 0x80;
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*(bios + 0x555) = 0xAA;
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*(bios + 0x2AA) = 0x55;
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*(bios + 0x555) = 0x10;
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myusec_delay(10);
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toggle_ready_jedec(bios);
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return(0);
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}
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int write_29f040b (struct flashchip * flash, unsigned char * buf)
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{
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int i;
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int total_size = flash->total_size * 1024, page_size = flash->page_size;
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volatile char * bios = flash->virt_addr;
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printf ("Programming Page: ");
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for (i = 0; i < total_size/page_size; i++) {
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/* erase the page before programming */
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erase_sector_29f040b(bios, i * page_size);
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/* write to the sector */
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printf ("%04d at address: ", i);
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write_sector_29f040b(bios, buf + i * page_size, bios + i * page_size,
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page_size);
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printf ("\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b");
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}
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printf("\n");
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return(0);
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}
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