wdenk | 4a55170 | 2003-10-08 23:26:14 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * (C) Copyright 2000 |
| 3 | * Wolfgang Denk, DENX Software Engineering, wd@denx.de. |
| 4 | * |
| 5 | * See file CREDITS for list of people who contributed to this |
| 6 | * project. |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU General Public License as |
| 10 | * published by the Free Software Foundation; either version 2 of |
| 11 | * the License, or (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| 21 | * MA 02111-1307 USA |
| 22 | */ |
| 23 | |
| 24 | |
| 25 | #include <common.h> |
| 26 | #include <nios.h> |
| 27 | |
| 28 | /*---------------------------------------------------------------------*/ |
| 29 | #define BANKSZ (8 * 1024 * 1024) |
| 30 | #define SECTSZ (64 * 1024) |
| 31 | #define USERFLASH (2 * 1024 * 1024) /* bottom 2 MB for user */ |
| 32 | |
| 33 | flash_info_t flash_info[CFG_MAX_FLASH_BANKS]; |
| 34 | |
| 35 | #define FLASH_WORD_SIZE unsigned char |
| 36 | |
| 37 | /*---------------------------------------------------------------------*/ |
| 38 | |
| 39 | unsigned long flash_init (void) |
| 40 | { |
| 41 | int i; |
| 42 | unsigned long addr; |
| 43 | flash_info_t *fli = &flash_info[0]; |
| 44 | |
| 45 | fli->size = BANKSZ; |
| 46 | fli->sector_count = CFG_MAX_FLASH_SECT; |
| 47 | fli->flash_id = FLASH_MAN_AMD; |
| 48 | |
| 49 | addr = CFG_FLASH_BASE; |
| 50 | for (i = 0; i < fli->sector_count; ++i) { |
| 51 | fli->start[i] = addr; |
| 52 | addr += SECTSZ; |
| 53 | |
| 54 | /* Protect all but 2 MByte user area */ |
| 55 | if (addr < (CFG_FLASH_BASE + USERFLASH)) |
| 56 | fli->protect[i] = 0; |
| 57 | else |
| 58 | fli->protect[i] = 1; |
| 59 | } |
| 60 | |
| 61 | return (BANKSZ); |
| 62 | } |
| 63 | |
| 64 | /*--------------------------------------------------------------------*/ |
| 65 | void flash_print_info (flash_info_t * info) |
| 66 | { |
| 67 | int i, k; |
| 68 | unsigned long size; |
| 69 | int erased; |
| 70 | volatile unsigned char *flash; |
| 71 | |
| 72 | printf (" Size: %ld KB in %d Sectors\n", |
| 73 | info->size >> 10, info->sector_count); |
| 74 | printf (" Sector Start Addresses:"); |
| 75 | for (i = 0; i < info->sector_count; ++i) { |
| 76 | |
| 77 | /* Check if whole sector is erased */ |
| 78 | if (i != (info->sector_count - 1)) |
| 79 | size = info->start[i + 1] - info->start[i]; |
| 80 | else |
| 81 | size = info->start[0] + info->size - info->start[i]; |
| 82 | erased = 1; |
| 83 | flash = (volatile unsigned char *) info->start[i]; |
| 84 | for (k = 0; k < size; k++) { |
| 85 | if (*flash++ != 0xff) { |
| 86 | erased = 0; |
| 87 | break; |
| 88 | } |
| 89 | } |
| 90 | |
| 91 | /* Print the info */ |
| 92 | if ((i % 5) == 0) |
| 93 | printf ("\n "); |
| 94 | printf (" %08lX%s%s", info->start[i], erased ? " E" : " ", |
| 95 | info->protect[i] ? "RO " : " "); |
| 96 | } |
| 97 | printf ("\n"); |
| 98 | } |
| 99 | |
| 100 | /*-------------------------------------------------------------------*/ |
| 101 | |
| 102 | |
| 103 | int flash_erase (flash_info_t * info, int s_first, int s_last) |
| 104 | { |
| 105 | volatile FLASH_WORD_SIZE *addr = (FLASH_WORD_SIZE *) (info->start[0]); |
| 106 | volatile FLASH_WORD_SIZE *addr2; |
| 107 | int prot, sect; |
| 108 | int any = 0; |
| 109 | unsigned oldpri; |
| 110 | ulong start; |
| 111 | |
| 112 | /* Some sanity checking */ |
| 113 | if ((s_first < 0) || (s_first > s_last)) { |
| 114 | printf ("- no sectors to erase\n"); |
| 115 | return 1; |
| 116 | } |
| 117 | |
| 118 | prot = 0; |
| 119 | for (sect = s_first; sect <= s_last; ++sect) { |
| 120 | if (info->protect[sect]) { |
| 121 | prot++; |
| 122 | } |
| 123 | } |
| 124 | if (prot) { |
| 125 | printf ("- Warning: %d protected sectors will not be erased!\n", |
| 126 | prot); |
| 127 | } else { |
| 128 | printf ("\n"); |
| 129 | } |
| 130 | |
| 131 | /* NOTE: disabling interrupts on Nios can be very bad since it |
| 132 | * also disables the LO_LIMIT exception. It's better here to |
| 133 | * set the interrupt priority to 3 & restore it when we're done. |
| 134 | */ |
| 135 | oldpri = ipri (3); |
| 136 | |
| 137 | /* It's ok to erase multiple sectors provided we don't delay more |
| 138 | * than 50 usec between cmds ... at which point the erase time-out |
| 139 | * occurs. So don't go and put printf() calls in the loop ... it |
| 140 | * won't be very helpful ;-) |
| 141 | */ |
| 142 | for (sect = s_first; sect <= s_last; sect++) { |
| 143 | if (info->protect[sect] == 0) { /* not protected */ |
| 144 | addr2 = (FLASH_WORD_SIZE *) (info->start[sect]); |
| 145 | *addr = 0xaa; |
| 146 | *addr = 0x55; |
| 147 | *addr = 0x80; |
| 148 | *addr = 0xaa; |
| 149 | *addr = 0x55; |
| 150 | *addr2 = 0x30; |
| 151 | any = 1; |
| 152 | } |
| 153 | } |
| 154 | |
| 155 | /* Now just wait for 0xff & provide some user feedback while |
| 156 | * we wait. |
| 157 | */ |
| 158 | if (any) { |
| 159 | addr2 = (FLASH_WORD_SIZE *) (info->start[sect]); |
| 160 | start = get_timer (0); |
| 161 | while (*addr2 != 0xff) { |
| 162 | udelay (1000 * 1000); |
| 163 | putc ('.'); |
| 164 | if (get_timer (start) > CFG_FLASH_ERASE_TOUT) { |
| 165 | printf ("timeout\n"); |
| 166 | return 1; |
| 167 | } |
| 168 | } |
| 169 | printf ("\n"); |
| 170 | } |
| 171 | |
| 172 | /* Restore interrupt priority */ |
| 173 | ipri (oldpri); |
| 174 | |
| 175 | return 0; |
| 176 | } |
| 177 | |
| 178 | /*----------------------------------------------------------------------- |
| 179 | * Copy memory to flash, returns: |
| 180 | * 0 - OK |
| 181 | * 1 - write timeout |
| 182 | * 2 - Flash not erased |
| 183 | */ |
| 184 | |
| 185 | int write_buff (flash_info_t * info, uchar * src, ulong addr, ulong cnt) |
| 186 | { |
| 187 | |
| 188 | vu_char *cmd = (vu_char *) info->start[0]; |
| 189 | vu_char *dst = (vu_char *) addr; |
| 190 | unsigned char b; |
| 191 | unsigned oldpri; |
| 192 | ulong start; |
| 193 | |
| 194 | while (cnt) { |
| 195 | /* Check for sufficient erase */ |
| 196 | b = *src; |
| 197 | if ((*dst & b) != b) { |
| 198 | printf ("%02x : %02x\n", *dst, b); |
| 199 | return (2); |
| 200 | } |
| 201 | |
| 202 | /* Disable interrupts other than window underflow |
| 203 | * (interrupt priority 2) |
| 204 | */ |
| 205 | oldpri = ipri (3); |
| 206 | *cmd = 0xaa; |
| 207 | *cmd = 0x55; |
| 208 | *cmd = 0xa0; |
| 209 | *dst = b; |
| 210 | |
| 211 | /* Verify write */ |
| 212 | start = get_timer (0); |
| 213 | while (*dst != b) { |
| 214 | if (get_timer (start) > CFG_FLASH_WRITE_TOUT) { |
| 215 | ipri (oldpri); |
| 216 | return 1; |
| 217 | } |
| 218 | } |
| 219 | dst++; |
| 220 | src++; |
| 221 | cnt--; |
| 222 | ipri (oldpri); |
| 223 | } |
| 224 | |
| 225 | return (0); |
| 226 | } |