diff options
Diffstat (limited to 'sharplhf00l04.c')
| -rw-r--r-- | sharplhf00l04.c | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/sharplhf00l04.c b/sharplhf00l04.c new file mode 100644 index 0000000..e7e5eed --- /dev/null +++ b/sharplhf00l04.c @@ -0,0 +1,155 @@ +/* + * sst28sf040.c: driver for SST28SF040C flash models. + * + * + * Copyright 2000 Silicon Integrated System Corporation + * Copyright 2005 coresystems GmbH <stepan@openbios.org> + * + * 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: + * 8 MEgabit (1024K x 8) SHARP LHF00L04, data sheet + * + */ + +#include <stdio.h> +#include <stdint.h> +#include "flash.h" +#include "debug.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_lhf00l04(volatile uint8_t *bios) +{ + /* ask compiler not to optimize this */ +// volatile uint8_t tmp; + +} + +static __inline__ void unprotect_lhf00l04(volatile uint8_t *bios) +{ + /* ask compiler not to optimize this */ +// volatile uint8_t tmp; +} + +static __inline__ int erase_sector_lhf00l04(volatile uint8_t *bios, + unsigned long address) +{ + + return (0); +} + +static __inline__ int write_sector_lhf00l04(volatile uint8_t *bios, + uint8_t *src, + volatile uint8_t *dst, + unsigned int page_size) +{ + int i; + + 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; + } + /*issue AUTO PROGRAM command */ + *dst = AUTO_PGRM; + *dst++ = *src++; + + /* wait for Toggle bit ready */ +// toggle_ready_jedec(bios); + } + + return (0); +} + +int probe_lhf00l04(struct flashchip *flash) +{ + volatile uint8_t *bios = flash->virt_addr; + uint8_t id1, id2, tmp; + + /* save the value at the beginning of the Flash */ + tmp = *bios; + + *bios = RESET; + myusec_delay(10); + + *bios = READ_ID; + myusec_delay(10); + id1 = *(volatile uint8_t *) bios; + myusec_delay(10); + id2 = *(volatile uint8_t *) (bios + 0x01); + + *bios = RESET; + 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 1; + + /* if there is no lhf00l04, restore the original value */ + *bios = tmp; + return 0; +} + +int erase_lhf00l04(struct flashchip *flash) +{ + volatile uint8_t *bios = flash->virt_addr; + + unprotect_lhf00l04(bios); + *bios = CHIP_ERASE; + *bios = CHIP_ERASE; + protect_lhf00l04(bios); + + myusec_delay(10); +// toggle_ready_jedec(bios); + + return (0); +} + +int write_lhf00l04(struct flashchip *flash, uint8_t *buf) +{ + int i; + int total_size = flash->total_size * 1024, page_size = + flash->page_size; + volatile uint8_t *bios = flash->virt_addr; + + unprotect_lhf00l04(bios); + + printf("Programming Page: "); + for (i = 0; i < total_size / page_size; i++) { + /* erase the page before programming */ + erase_sector_lhf00l04(bios, i * page_size); + + /* write to the sector */ + printf("%04d at address: 0x%08x", i, i * page_size); + write_sector_lhf00l04(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_lhf00l04(bios); + + return (0); +} |
