board/ssv/common/flash.c

   1 /*
   2  * (C) Copyright 2000-2004
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * (C) Copyright 2004, Li-Pro.Net <www.li-pro.net>
   6  * Stephan Linz <linz@li-pro.net>
   7  *
   8  * See file CREDITS for list of people who contributed to this
   9  * project.
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License as
  13  * published by the Free Software Foundation; either version 2 of
  14  * the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  24  * MA 02111-1307 USA
  25  */
  26
  27
  28 #include <common.h>
  29 #include <watchdog.h>
  30 #include <nios.h>
  31
  32 flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS];
  33
  34 /*--------------------------------------------------------------------*/
  35 void flash_print_info (flash_info_t * info)
  36 {
  37         int i, k;
  38         unsigned long size;
  39         int erased;
  40         volatile unsigned char *flash;
  41
  42         printf ("  Size: %ld KB in %d Sectors\n",
  43                 info->size >> 10, info->sector_count);
  44         printf ("  Sector Start Addresses:");
  45         for (i = 0; i < info->sector_count; ++i) {
  46
  47                 /* Check if whole sector is erased */
  48                 if (i != (info->sector_count - 1))
  49                         size = info->start[i + 1] - info->start[i];
  50                 else
  51                         size = info->start[0] + info->size - info->start[i];
  52                 erased = 1;
  53                 flash = (volatile unsigned char *) info->start[i];
  54                 for (k = 0; k < size; k++) {
  55                         if (*flash++ != 0xff) {
  56                                 erased = 0;
  57                                 break;
  58                         }
  59                 }
  60
  61                 /* Print the info */
  62                 if ((i % 5) == 0)
  63                         printf ("\n   ");
  64                 printf (" %08lX%s%s", info->start[i], erased ? " E" : "  ",
  65                         info->protect[i] ? "RO " : "   ");
  66         }
  67         printf ("\n");
  68 }
  69
  70 /*-------------------------------------------------------------------*/
  71
  72
  73 int flash_erase (flash_info_t * info, int s_first, int s_last)
  74 {
  75         volatile CONFIG_SYS_FLASH_WORD_SIZE *addr = (CONFIG_SYS_FLASH_WORD_SIZE *) (info->start[0]);
  76         volatile CONFIG_SYS_FLASH_WORD_SIZE *addr2;
  77         int prot, sect, wait;
  78         unsigned oldpri;
  79         ulong start;
  80
  81         /* Some sanity checking */
  82         if ((s_first < 0) || (s_first > s_last)) {
  83                 printf ("- no sectors to erase\n");
  84                 return 1;
  85         }
  86
  87         prot = 0;
  88         for (sect = s_first; sect <= s_last; ++sect) {
  89                 if (info->protect[sect]) {
  90                         prot++;
  91                 }
  92         }
  93         if (prot) {
  94                 printf ("- Warning: %d protected sectors will not be erased!\n",
  95                         prot);
  96         } else {
  97                 printf ("\n");
  98         }
  99
 100 #ifdef DEBUG
 101         for (sect = s_first; sect <= s_last; sect++) {
 102                 printf("- Erase: Sect: %i @ 0x%08x\n", sect,  info->start[sect]);
 103         }
 104 #endif
 105
 106         /* NOTE: disabling interrupts on Nios can be very bad since it
 107          * also disables the LO_LIMIT exception. It's better here to
 108          * set the interrupt priority to 3 & restore it when we're done.
 109          */
 110         oldpri = ipri (3);
 111
 112         /* It's ok to erase multiple sectors provided we don't delay more
 113          * than 50 usec between cmds ... at which point the erase time-out
 114          * occurs. So don't go and put printf() calls in the loop ... it
 115          * won't be very helpful ;-)
 116          */
 117         for (sect = s_first; sect <= s_last; sect++) {
 118                 if (info->protect[sect] == 0) { /* not protected */
 119                         addr2 = (CONFIG_SYS_FLASH_WORD_SIZE *) (info->start[sect]);
 120                         *addr = 0xf0;
 121                         *(addr+0xAAA/2) = 0xaa;
 122                         *(addr+0x554/2) = 0x55;
 123                         *(addr+0xAAA/2) = 0x80;
 124                         *(addr+0xAAA/2) = 0xaa;
 125                         *(addr+0x554/2) = 0x55;
 126                         *addr2 = 0x30;
 127                         /* Now just wait for 0xffff & provide some user
 128                          * feedback while we wait. Here we have to grant
 129                          * timer interrupts. Otherwise get_timer() can't
 130                          * work right. */
 131                         ipri(oldpri);
 132                         start = get_timer (0);
 133                         while (*addr2 != 0xffff) {
 134                                 for (wait = 8; wait; wait--) {
 135                                         udelay (125 * 1000);
 136                                 }
 137                                 putc ('.');
 138                                 if (get_timer (start) > CONFIG_SYS_FLASH_ERASE_TOUT) {
 139                                         printf ("timeout\n");
 140                                         return 1;
 141                                 }
 142                         }
 143                         oldpri = ipri (3); /* disallow non important irqs again */
 144                 }
 145         }
 146
 147         printf ("\n");
 148         *addr = 0xf0;
 149
 150         /* Restore interrupt priority */
 151         ipri (oldpri);
 152
 153         return 0;
 154 }
 155
 156 /*-----------------------------------------------------------------------
 157  * Copy memory to flash, returns:
 158  * 0 - OK
 159  * 1 - write timeout
 160  * 2 - Flash not erased
 161  */
 162
 163 int write_buff (flash_info_t * info, uchar * srcbuffer, ulong addr, ulong cnt)
 164 {
 165
 166         volatile CONFIG_SYS_FLASH_WORD_SIZE *cmd = (vu_short *) info->start[0];
 167         volatile CONFIG_SYS_FLASH_WORD_SIZE *dst = (vu_short *) addr;
 168         CONFIG_SYS_FLASH_WORD_SIZE *src = (void *) srcbuffer;
 169         CONFIG_SYS_FLASH_WORD_SIZE b;
 170         unsigned oldpri;
 171         ulong start;
 172
 173         cnt /= sizeof(CONFIG_SYS_FLASH_WORD_SIZE);
 174         while (cnt) {
 175                 /* Check for sufficient erase */
 176                 b = *src;
 177                 if ((*dst & b) != b) {
 178                         printf ("%02x : %02x\n", *dst, b);
 179                         return (2);
 180                 }
 181
 182                 /* Disable interrupts other than window underflow
 183                  * (interrupt priority 2)
 184                  */
 185                 oldpri = ipri (3);
 186                 *(cmd+0xAAA/2) = 0xaa;
 187                 *(cmd+0x554/2) = 0x55;
 188                 *(cmd+0xAAA/2) = 0xa0;
 189                 ipri (oldpri);
 190                 *dst = b;
 191
 192                 /* Verify write */
 193                 start = get_timer (0);
 194                 while (*dst != b) {
 195                         if (get_timer (start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
 196                                 *cmd = 0xf0;
 197                                 return 1;
 198                         }
 199                 }
 200                 dst++;
 201                 src++;
 202                 cnt--;
 203         }
 204
 205         *cmd = 0xf0;
 206         return (0);
 207 }