diff options
Diffstat (limited to 'sst39sf020.c')
| -rw-r--r-- | sst39sf020.c | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/sst39sf020.c b/sst39sf020.c new file mode 100644 index 0000000..3c310a7 --- /dev/null +++ b/sst39sf020.c @@ -0,0 +1,163 @@ +/* + * 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 "flash.h" +#include "jedec.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__ 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); +} + +static __inline__ 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++) { + /* 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); + } +} + +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(__FUNCTION__ "id1 %d, id2 %d\n", id1, id2); + if (id1 == flash->manufacture_id && id2 == flash->model_id) + return 1; + + return 0; +} + +int erase_39sf020 (struct flashchip * flash) +{ + volatile char * bios = flash->virt_addr; + + unprotect_39sf020 (bios); + *bios = CHIP_ERASE; + *bios = CHIP_ERASE; + protect_39sf020 (bios); + + myusec_delay(10); + toggle_ready_jedec(bios); +} + +int write_39sf020 (struct flashchip * flash, 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); + + 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"); + } + printf("\n"); + +// protect_39sf020 (bios); +} |
