diff options
Diffstat (limited to 'board/dk1c20/flash.c')
| -rw-r--r-- | board/dk1c20/flash.c | 226 |
1 files changed, 226 insertions, 0 deletions
diff --git a/board/dk1c20/flash.c b/board/dk1c20/flash.c new file mode 100644 index 0000000..c64f7dc --- /dev/null +++ b/board/dk1c20/flash.c @@ -0,0 +1,226 @@ +/* + * (C) Copyright 2000 + * Wolfgang Denk, DENX Software Engineering, wd@denx.de. + * + * See file CREDITS for list of people who contributed to this + * project. + * + * 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., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + + +#include <common.h> +#include <nios.h> + +/*---------------------------------------------------------------------*/ +#define BANKSZ (8 * 1024 * 1024) +#define SECTSZ (64 * 1024) +#define USERFLASH (2 * 1024 * 1024) /* bottom 2 MB for user */ + +flash_info_t flash_info[CFG_MAX_FLASH_BANKS]; + +#define FLASH_WORD_SIZE unsigned char + +/*---------------------------------------------------------------------*/ + +unsigned long flash_init (void) +{ + int i; + unsigned long addr; + flash_info_t *fli = &flash_info[0]; + + fli->size = BANKSZ; + fli->sector_count = CFG_MAX_FLASH_SECT; + fli->flash_id = FLASH_MAN_AMD; + + addr = CFG_FLASH_BASE; + for (i = 0; i < fli->sector_count; ++i) { + fli->start[i] = addr; + addr += SECTSZ; + + /* Protect all but 2 MByte user area */ + if (addr < (CFG_FLASH_BASE + USERFLASH)) + fli->protect[i] = 0; + else + fli->protect[i] = 1; + } + + return (BANKSZ); +} + +/*--------------------------------------------------------------------*/ +void flash_print_info (flash_info_t * info) +{ + int i, k; + unsigned long size; + int erased; + volatile unsigned char *flash; + + printf (" Size: %ld KB in %d Sectors\n", + info->size >> 10, info->sector_count); + printf (" Sector Start Addresses:"); + for (i = 0; i < info->sector_count; ++i) { + + /* Check if whole sector is erased */ + if (i != (info->sector_count - 1)) + size = info->start[i + 1] - info->start[i]; + else + size = info->start[0] + info->size - info->start[i]; + erased = 1; + flash = (volatile unsigned char *) info->start[i]; + for (k = 0; k < size; k++) { + if (*flash++ != 0xff) { + erased = 0; + break; + } + } + + /* Print the info */ + if ((i % 5) == 0) + printf ("\n "); + printf (" %08lX%s%s", info->start[i], erased ? " E" : " ", + info->protect[i] ? "RO " : " "); + } + printf ("\n"); +} + +/*-------------------------------------------------------------------*/ + + +int flash_erase (flash_info_t * info, int s_first, int s_last) +{ + volatile FLASH_WORD_SIZE *addr = (FLASH_WORD_SIZE *) (info->start[0]); + volatile FLASH_WORD_SIZE *addr2; + int prot, sect; + int any = 0; + unsigned oldpri; + ulong start; + + /* Some sanity checking */ + if ((s_first < 0) || (s_first > s_last)) { + printf ("- no sectors to erase\n"); + return 1; + } + + prot = 0; + for (sect = s_first; sect <= s_last; ++sect) { + if (info->protect[sect]) { + prot++; + } + } + if (prot) { + printf ("- Warning: %d protected sectors will not be erased!\n", + prot); + } else { + printf ("\n"); + } + + /* NOTE: disabling interrupts on Nios can be very bad since it + * also disables the LO_LIMIT exception. It's better here to + * set the interrupt priority to 3 & restore it when we're done. + */ + oldpri = ipri (3); + + /* It's ok to erase multiple sectors provided we don't delay more + * than 50 usec between cmds ... at which point the erase time-out + * occurs. So don't go and put printf() calls in the loop ... it + * won't be very helpful ;-) + */ + for (sect = s_first; sect <= s_last; sect++) { + if (info->protect[sect] == 0) { /* not protected */ + addr2 = (FLASH_WORD_SIZE *) (info->start[sect]); + *addr = 0xaa; + *addr = 0x55; + *addr = 0x80; + *addr = 0xaa; + *addr = 0x55; + *addr2 = 0x30; + any = 1; + } + } + + /* Now just wait for 0xff & provide some user feedback while + * we wait. + */ + if (any) { + addr2 = (FLASH_WORD_SIZE *) (info->start[sect]); + start = get_timer (0); + while (*addr2 != 0xff) { + udelay (1000 * 1000); + putc ('.'); + if (get_timer (start) > CFG_FLASH_ERASE_TOUT) { + printf ("timeout\n"); + return 1; + } + } + printf ("\n"); + } + + /* Restore interrupt priority */ + ipri (oldpri); + + return 0; +} + +/*----------------------------------------------------------------------- + * Copy memory to flash, returns: + * 0 - OK + * 1 - write timeout + * 2 - Flash not erased + */ + +int write_buff (flash_info_t * info, uchar * src, ulong addr, ulong cnt) +{ + + vu_char *cmd = (vu_char *) info->start[0]; + vu_char *dst = (vu_char *) addr; + unsigned char b; + unsigned oldpri; + ulong start; + + while (cnt) { + /* Check for sufficient erase */ + b = *src; + if ((*dst & b) != b) { + printf ("%02x : %02x\n", *dst, b); + return (2); + } + + /* Disable interrupts other than window underflow + * (interrupt priority 2) + */ + oldpri = ipri (3); + *cmd = 0xaa; + *cmd = 0x55; + *cmd = 0xa0; + *dst = b; + + /* Verify write */ + start = get_timer (0); + while (*dst != b) { + if (get_timer (start) > CFG_FLASH_WRITE_TOUT) { + ipri (oldpri); + return 1; + } + } + dst++; + src++; + cnt--; + ipri (oldpri); + } + + return (0); +} |