board/altera/common/flash.c

   1 /*
   2  * (C) Copyright 2000-2004
   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 flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS];
  29
  30 /*--------------------------------------------------------------------*/
  31 void flash_print_info (flash_info_t * info)
  32 {
  33         int i, k;
  34         unsigned long size;
  35         int erased;
  36         volatile unsigned char *flash;
  37
  38         printf ("  Size: %ld KB in %d Sectors\n",
  39                 info->size >> 10, info->sector_count);
  40         printf ("  Sector Start Addresses:");
  41         for (i = 0; i < info->sector_count; ++i) {
  42
  43                 /* Check if whole sector is erased */
  44                 if (i != (info->sector_count - 1))
  45                         size = info->start[i + 1] - info->start[i];
  46                 else
  47                         size = info->start[0] + info->size - info->start[i];
  48                 erased = 1;
  49                 flash = (volatile unsigned char *) info->start[i];
  50                 for (k = 0; k < size; k++) {
  51                         if (*flash++ != 0xff) {
  52                                 erased = 0;
  53                                 break;
  54                         }
  55                 }
  56
  57                 /* Print the info */
  58                 if ((i % 5) == 0)
  59                         printf ("\n   ");
  60                 printf (" %08lX%s%s", info->start[i], erased ? " E" : "  ",
  61                         info->protect[i] ? "RO " : "   ");
  62         }
  63         printf ("\n");
  64 }
  65
  66 /*-------------------------------------------------------------------*/
  67
  68
  69 int flash_erase (flash_info_t * info, int s_first, int s_last)
  70 {
  71         volatile CONFIG_SYS_FLASH_WORD_SIZE *addr = (CONFIG_SYS_FLASH_WORD_SIZE *) (info->start[0]);
  72         volatile CONFIG_SYS_FLASH_WORD_SIZE *addr2;
  73         int prot, sect;
  74         unsigned oldpri;
  75         ulong start;
  76
  77         /* Some sanity checking */
  78         if ((s_first < 0) || (s_first > s_last)) {
  79                 printf ("- no sectors to erase\n");
  80                 return 1;
  81         }
  82
  83         prot = 0;
  84         for (sect = s_first; sect <= s_last; ++sect) {
  85                 if (info->protect[sect]) {
  86                         prot++;
  87                 }
  88         }
  89         if (prot) {
  90                 printf ("- Warning: %d protected sectors will not be erased!\n",
  91                         prot);
  92         } else {
  93                 printf ("\n");
  94         }
  95
  96 #ifdef DEBUG
  97         for (sect = s_first; sect <= s_last; sect++) {
  98                 printf("- Erase: Sect: %i @ 0x%08x\n", sect,  info->start[sect]);
  99         }
 100 #endif
 101
 102         /* NOTE: disabling interrupts on Nios can be very bad since it
 103          * also disables the LO_LIMIT exception. It's better here to
 104          * set the interrupt priority to 3 & restore it when we're done.
 105          */
 106         oldpri = ipri (3);
 107
 108         /* It's ok to erase multiple sectors provided we don't delay more
 109          * than 50 usec between cmds ... at which point the erase time-out
 110          * occurs. So don't go and put printf() calls in the loop ... it
 111          * won't be very helpful ;-)
 112          */
 113         for (sect = s_first; sect <= s_last; sect++) {
 114                 if (info->protect[sect] == 0) { /* not protected */
 115                         addr2 = (CONFIG_SYS_FLASH_WORD_SIZE *) (info->start[sect]);
 116                         *addr = 0xaa;
 117                         *addr = 0x55;
 118                         *addr = 0x80;
 119                         *addr = 0xaa;
 120                         *addr = 0x55;
 121                         *addr2 = 0x30;
 122                         /* Now just wait for 0xff & provide some user
 123                          * feedback while we wait. Here we have to grant
 124                          * timer interrupts. Otherwise get_timer() can't
 125                          * work right. */
 126                         ipri(oldpri);
 127                         start = get_timer (0);
 128                         while (*addr2 != 0xff) {
 129                                 udelay (1000 * 1000);
 130                                 putc ('.');
 131                                 if (get_timer (start) > CONFIG_SYS_FLASH_ERASE_TOUT) {
 132                                         printf ("timeout\n");
 133                                         return 1;
 134                                 }
 135                         }
 136                         oldpri = ipri (3); /* disallow non important irqs again */
 137                 }
 138         }
 139
 140         printf ("\n");
 141
 142         /* Restore interrupt priority */
 143         ipri (oldpri);
 144
 145         return 0;
 146 }
 147
 148 /*-----------------------------------------------------------------------
 149  * Copy memory to flash, returns:
 150  * 0 - OK
 151  * 1 - write timeout
 152  * 2 - Flash not erased
 153  */
 154
 155 int write_buff (flash_info_t * info, uchar * src, ulong addr, ulong cnt)
 156 {
 157
 158         vu_char *cmd = (vu_char *) info->start[0];
 159         vu_char *dst = (vu_char *) addr;
 160         unsigned char b;
 161         unsigned oldpri;
 162         ulong start;
 163
 164         while (cnt) {
 165                 /* Check for sufficient erase */
 166                 b = *src;
 167                 if ((*dst & b) != b) {
 168                         printf ("%02x : %02x\n", *dst, b);
 169                         return (2);
 170                 }
 171
 172                 /* Disable interrupts other than window underflow
 173                  * (interrupt priority 2)
 174                  */
 175                 oldpri = ipri (3);
 176                 *cmd = 0xaa;
 177                 *cmd = 0x55;
 178                 *cmd = 0xa0;
 179                 *dst = b;
 180
 181                 /* Verify write */
 182                 start = get_timer (0);
 183                 while (*dst != b) {
 184                         if (get_timer (start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
 185                                 ipri (oldpri);
 186                                 return 1;
 187                         }
 188                 }
 189                 dst++;
 190                 src++;
 191                 cnt--;
 192                 ipri (oldpri);
 193         }
 194
 195         return (0);
 196 }