board/atmel/atstk1000/flash.c

   1 /*
   2  * Copyright (C) 2005-2006 Atmel Corporation
   3  *
   4  * See file CREDITS for list of people who contributed to this
   5  * project.
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation; either version 2 of
  10  * the License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  20  * MA 02111-1307 USA
  21  */
  22 #include <common.h>
  23
  24 #ifdef CONFIG_ATSTK1000_EXT_FLASH
  25 #include <asm/cacheflush.h>
  26 #include <asm/io.h>
  27 #include <asm/sections.h>
  28
  29 DECLARE_GLOBAL_DATA_PTR;
  30
  31 flash_info_t flash_info[1];
  32
  33 static void flash_identify(uint16_t *flash, flash_info_t *info)
  34 {
  35         unsigned long flags;
  36
  37         flags = disable_interrupts();
  38
  39         dcache_flush_unlocked();
  40
  41         writew(0xaa, flash + 0x555);
  42         writew(0x55, flash + 0xaaa);
  43         writew(0x90, flash + 0x555);
  44         info->flash_id = readl(flash);
  45         writew(0xff, flash);
  46
  47         readw(flash);
  48
  49         if (flags)
  50                 enable_interrupts();
  51 }
  52
  53 unsigned long flash_init(void)
  54 {
  55         unsigned long addr;
  56         unsigned int i;
  57
  58         flash_info[0].size = CONFIG_SYS_FLASH_SIZE;
  59         flash_info[0].sector_count = 135;
  60
  61         flash_identify(uncached((void *)CONFIG_SYS_FLASH_BASE), &flash_info[0]);
  62
  63         for (i = 0, addr = 0; i < 8; i++, addr += 0x2000)
  64                 flash_info[0].start[i] = addr;
  65         for (; i < flash_info[0].sector_count; i++, addr += 0x10000)
  66                 flash_info[0].start[i] = addr;
  67
  68         return CONFIG_SYS_FLASH_SIZE;
  69 }
  70
  71 void flash_print_info(flash_info_t *info)
  72 {
  73         printf("Flash: Vendor ID: 0x%02lx, Product ID: 0x%02lx\n",
  74                info->flash_id >> 16, info->flash_id & 0xffff);
  75         printf("Size: %ld MB in %d sectors\n",
  76                info->size >> 10, info->sector_count);
  77 }
  78
  79 int flash_erase(flash_info_t *info, int s_first, int s_last)
  80 {
  81         unsigned long flags;
  82         unsigned long start_time;
  83         uint16_t *fb, *sb;
  84         unsigned int i;
  85         int ret;
  86         uint16_t status;
  87
  88         if ((s_first < 0) || (s_first > s_last)
  89             || (s_last >= info->sector_count)) {
  90                 puts("Error: first and/or last sector out of range\n");
  91                 return ERR_INVAL;
  92         }
  93
  94         for (i = s_first; i < s_last; i++)
  95                 if (info->protect[i]) {
  96                         printf("Error: sector %d is protected\n", i);
  97                         return ERR_PROTECTED;
  98                 }
  99
 100         fb = (uint16_t *)uncached(info->start[0]);
 101
 102         dcache_flush_unlocked();
 103
 104         for (i = s_first; (i <= s_last) && !ctrlc(); i++) {
 105                 printf("Erasing sector %3d...", i);
 106
 107                 sb = (uint16_t *)uncached(info->start[i]);
 108
 109                 flags = disable_interrupts();
 110
 111                 start_time = get_timer(0);
 112
 113                 /* Unlock sector */
 114                 writew(0xaa, fb + 0x555);
 115                 writew(0x70, sb);
 116
 117                 /* Erase sector */
 118                 writew(0xaa, fb + 0x555);
 119                 writew(0x55, fb + 0xaaa);
 120                 writew(0x80, fb + 0x555);
 121                 writew(0xaa, fb + 0x555);
 122                 writew(0x55, fb + 0xaaa);
 123                 writew(0x30, sb);
 124
 125                 /* Wait for completion */
 126                 ret = ERR_OK;
 127                 do {
 128                         /* TODO: Timeout */
 129                         status = readw(sb);
 130                 } while ((status != 0xffff) && !(status & 0x28));
 131
 132                 writew(0xf0, fb);
 133
 134                 /*
 135                  * Make sure the command actually makes it to the bus
 136                  * before we re-enable interrupts.
 137                  */
 138                 readw(fb);
 139
 140                 if (flags)
 141                         enable_interrupts();
 142
 143                 if (status != 0xffff) {
 144                         printf("Flash erase error at address 0x%p: 0x%02x\n",
 145                                sb, status);
 146                         ret = ERR_PROG_ERROR;
 147                         break;
 148                 }
 149         }
 150
 151         if (ctrlc())
 152                 printf("User interrupt!\n");
 153
 154         return ERR_OK;
 155 }
 156
 157 int write_buff(flash_info_t *info, uchar *src,
 158                            ulong addr, ulong count)
 159 {
 160         unsigned long flags;
 161         uint16_t *base, *p, *s, *end;
 162         uint16_t word, status, status1;
 163         int ret = ERR_OK;
 164
 165         if (addr < info->start[0]
 166             || (addr + count) > (info->start[0] + info->size)
 167             || (addr + count) < addr) {
 168                 puts("Error: invalid address range\n");
 169                 return ERR_INVAL;
 170         }
 171
 172         if (addr & 1 || count & 1 || (unsigned int)src & 1) {
 173                 puts("Error: misaligned source, destination or count\n");
 174                 return ERR_ALIGN;
 175         }
 176
 177         base = (uint16_t *)uncached(info->start[0]);
 178         end = (uint16_t *)uncached(addr + count);
 179
 180         flags = disable_interrupts();
 181
 182         dcache_flush_unlocked();
 183         sync_write_buffer();
 184
 185         for (p = (uint16_t *)uncached(addr), s = (uint16_t *)src;
 186              p < end && !ctrlc(); p++, s++) {
 187                 word = *s;
 188
 189                 writew(0xaa, base + 0x555);
 190                 writew(0x55, base + 0xaaa);
 191                 writew(0xa0, base + 0x555);
 192                 writew(word, p);
 193
 194                 sync_write_buffer();
 195
 196                 /* Wait for completion */
 197                 status1 = readw(p);
 198                 do {
 199                         /* TODO: Timeout */
 200                         status = status1;
 201                         status1 = readw(p);
 202                 } while (((status ^ status1) & 0x40)    /* toggled */
 203                          && !(status1 & 0x28));         /* error bits */
 204
 205                 /*
 206                  * We'll need to check once again for toggle bit
 207                  * because the toggle bit may stop toggling as I/O5
 208                  * changes to "1" (ref at49bv642.pdf p9)
 209                  */
 210                 status1 = readw(p);
 211                 status = readw(p);
 212                 if ((status ^ status1) & 0x40) {
 213                         printf("Flash write error at address 0x%p: "
 214                                "0x%02x != 0x%02x\n",
 215                                p, status,word);
 216                         ret = ERR_PROG_ERROR;
 217                         writew(0xf0, base);
 218                         readw(base);
 219                         break;
 220                 }
 221
 222                 writew(0xf0, base);
 223                 readw(base);
 224         }
 225
 226         if (flags)
 227                 enable_interrupts();
 228
 229         return ret;
 230 }
 231
 232 #endif /* CONFIG_ATSTK1000_EXT_FLASH */