| /* sst40lf020.c: driver for SST40LF040 flash 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: |
| * 4 MEgabit (512K x 8) SuperFlash EEPROM, SST49lF040 data sheet |
| * |
| * ToDo: Consilidated to standard JEDEC code. |
| * |
| * $Id$ |
| */ |
| #include <stdio.h> |
| #include "flash.h" |
| #include "jedec.h" |
| #include "sst49lf040.h" |
| |
| #define AUTO_PG_ERASE1 0x20 |
| #define AUTO_PG_ERASE2 0xD0 |
| #define AUTO_PGRM 0x10 |
| #define CHIP_ERASE 0x30 |
| #define RESET 0xFF |
| #define READ_ID 0x90 |
| |
| static int erase_sector_49lf040 (volatile char * bios, unsigned int page) |
| { |
| /* Chip erase function does not exist for LPC mode on 49lf040. |
| * Erase sector-by-sector instead. */ |
| volatile unsigned char *Temp; |
| |
| /* Issue the Sector Erase command to 40LF040 */ |
| Temp = bios + 0x5555; /* set up address to be C000:5555h */ |
| *Temp = 0xAA; /* write data 0xAA to the address */ |
| myusec_delay(10); |
| Temp = bios + 0x2AAA; /* set up address to be C000:2AAAh */ |
| *Temp = 0x55; /* write data 0x55 to the address */ |
| myusec_delay(10); |
| Temp = bios + 0x5555; /* set up address to be C000:5555h */ |
| *Temp = 0x80; /* write data 0x80 to the address */ |
| myusec_delay(10); |
| Temp = bios + 0x5555; /* set up address to be C000:5555h */ |
| *Temp = 0xAA; /* write data 0xAA to the address */ |
| myusec_delay(10); |
| Temp = bios + 0x2AAA; /* set up address to be C000:2AAAh */ |
| *Temp = 0x55; /* write data 0x55 to the address */ |
| myusec_delay(10); |
| Temp = bios + page; /* set up address to be the current sector */ |
| *Temp = 0x30; /* write data 0x30 to the address */ |
| |
| /* wait for Toggle bit ready */ |
| toggle_ready_jedec(bios); |
| |
| return(0); |
| } |
| |
| static __inline__ int write_sector_49lf040(volatile char * bios, |
| unsigned char * src, |
| volatile unsigned char * dst, |
| unsigned int page_size) |
| { |
| int i; |
| volatile char *Temp; |
| |
| for (i = 0; i < page_size; i++) { |
| if (*dst != 0xff) { |
| printf("FATAL: dst %p not erased (val 0x%x)\n", dst, *dst); |
| return(-1); |
| } |
| /* transfer data from source to destination */ |
| if (*src == 0xFF) { |
| dst++, src++; |
| /* If the data is 0xFF, don't program it */ |
| continue; |
| } |
| Temp = (bios + 0x5555); |
| *Temp = 0xAA; |
| Temp = bios + 0x2AAA; |
| *Temp = 0x55; |
| Temp = bios + 0x5555; |
| *Temp = 0xA0; |
| *dst = *src; |
| toggle_ready_jedec(bios); |
| if (*dst != *src) |
| printf("BAD! dst 0x%lx val 0x%x src 0x%x\n", |
| (unsigned long)dst, *dst, *src); |
| dst++, src++; |
| } |
| |
| return(0); |
| } |
| |
| int probe_49lf040 (struct flashchip * flash) |
| { |
| volatile char * bios = flash->virt_addr; |
| unsigned char id1, id2; |
| |
| *(volatile char *) (bios + 0x5555) = 0xAA; |
| myusec_delay(10); |
| *(volatile char *) (bios + 0x2AAA) = 0x55; |
| myusec_delay(10); |
| *(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("%s: id1 0x%x, id2 0x%x\n", __FUNCTION__, id1, id2); |
| |
| if (id1 == flash->manufacture_id && id2 == flash->model_id) |
| return 1; |
| |
| return 0; |
| } |
| |
| /* Chip erase only works in parallel programming mode for the 49lf040. |
| * Use sector-erase instead */ |
| int erase_49lf040 (struct flashchip * flash) |
| { |
| volatile unsigned char * bios = flash->virt_addr; |
| volatile unsigned char *Temp; |
| |
| /* Issue the Sector Erase command to 40LF040 */ |
| Temp = bios + 0x5555; /* set up address to be C000:5555h */ |
| *Temp = 0xAA; /* write data 0xAA to the address */ |
| myusec_delay(10); |
| Temp = bios + 0x2AAA; /* set up address to be C000:2AAAh */ |
| *Temp = 0x55; /* write data 0x55 to the address */ |
| myusec_delay(10); |
| Temp = bios + 0x5555; /* set up address to be C000:5555h */ |
| *Temp = 0x80; /* write data 0x80 to the address */ |
| myusec_delay(10); |
| Temp = bios + 0x5555; /* set up address to be C000:5555h */ |
| *Temp = 0xAA; /* write data 0xAA to the address */ |
| myusec_delay(10); |
| Temp = bios + 0x2AAA; /* set up address to be C000:2AAAh */ |
| *Temp = 0x55; /* write data 0x55 to the address */ |
| myusec_delay(10); |
| Temp = bios + 0x5555; /* set up address to be C000:5555h */ |
| *Temp = 0x10; /* write data 0x55 to the address */ |
| myusec_delay(50000); |
| |
| return(0); |
| } |
| |
| int write_49lf040 (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_49lf040(bios, i * page_size); |
| |
| /* write to the sector */ |
| printf ("%04d at address: 0x%08x ", i, i * page_size); |
| write_sector_49lf040(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\b"); |
| fflush(stdout); |
| } |
| printf("\n"); |
| |
| return(0); |
| } |