diff options
Diffstat (limited to 'util/flash_and_burn/sst39sf020.c')
| -rw-r--r-- | util/flash_and_burn/sst39sf020.c | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/util/flash_and_burn/sst39sf020.c b/util/flash_and_burn/sst39sf020.c new file mode 100644 index 0000000000..65fc623825 --- /dev/null +++ b/util/flash_and_burn/sst39sf020.c @@ -0,0 +1,199 @@ +/* + * sst39sf020.c: driver for SST28SF040C 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, SST28SF040 data sheet + * + * $Id$ + */ + +#include <stdio.h> +#include "flash.h" +#include "jedec.h" +#include "sst39sf020.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 __inline__ void protect_39sf020 (volatile char * bios) +{ + /* ask compiler not to optimize this */ + volatile unsigned char tmp; + + tmp = *(volatile unsigned char *) (bios + 0x1823); + tmp = *(volatile unsigned char *) (bios + 0x1820); + tmp = *(volatile unsigned char *) (bios + 0x1822); + tmp = *(volatile unsigned char *) (bios + 0x0418); + tmp = *(volatile unsigned char *) (bios + 0x041B); + tmp = *(volatile unsigned char *) (bios + 0x0419); + tmp = *(volatile unsigned char *) (bios + 0x040A); +} + +static __inline__ void unprotect_39sf020 (volatile char * bios) +{ + /* ask compiler not to optimize this */ + volatile unsigned char tmp; + + tmp = *(volatile unsigned char *) (bios + 0x1823); + tmp = *(volatile unsigned char *) (bios + 0x1820); + tmp = *(volatile unsigned char *) (bios + 0x1822); + tmp = *(volatile unsigned char *) (bios + 0x0418); + tmp = *(volatile unsigned char *) (bios + 0x041B); + tmp = *(volatile unsigned char *) (bios + 0x0419); + tmp = *(volatile unsigned char *) (bios + 0x041A); +} + +static __inline__ int erase_sector_39sf020 (volatile char * bios, unsigned long address) +{ + *bios = AUTO_PG_ERASE1; + *(bios + address) = AUTO_PG_ERASE2; + + /* wait for Toggle bit ready */ + toggle_ready_jedec(bios); + + return(0); +} + +static __inline__ int write_sector_39sf020(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_39sf020 (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; +} + +int erase_39sf020 (struct flashchip * flash) +{ + volatile unsigned char * bios = flash->virt_addr; + volatile unsigned char *Temp; + + /* Issue the Sector Erase command to 39SF020 */ + 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_39sf020 (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; + +// unprotect_39sf020 (bios); + erase_39sf020(flash); + printf ("Programming Page: "); + for (i = 0; i < total_size/page_size; i++) { + /* erase the page before programming */ + //erase_sector_39sf020(bios, i * page_size); + + /* write to the sector */ + printf ("%04d at address: 0x%08x", i, i * page_size); + write_sector_39sf020(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"); + fflush(stdout); + } + printf("\n"); + +// protect_39sf020 (bios); + + return(0); +} |