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 __flashprog 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         gd->bd->bi_flashstart = CFG_FLASH_BASE;
  59         gd->bd->bi_flashsize = CFG_FLASH_SIZE;
  60         gd->bd->bi_flashoffset = __edata_lma - _text;
  61
  62         flash_info[0].size = CFG_FLASH_SIZE;
  63         flash_info[0].sector_count = 135;
  64
  65         flash_identify(uncached((void *)CFG_FLASH_BASE), &flash_info[0]);
  66
  67         for (i = 0, addr = 0; i < 8; i++, addr += 0x2000)
  68                 flash_info[0].start[i] = addr;
  69         for (; i < flash_info[0].sector_count; i++, addr += 0x10000)
  70                 flash_info[0].start[i] = addr;
  71
  72         return CFG_FLASH_SIZE;
  73 }
  74
  75 void flash_print_info(flash_info_t *info)
  76 {
  77         printf("Flash: Vendor ID: 0x%02x, Product ID: 0x%02x\n",
  78                info->flash_id >> 16, info->flash_id & 0xffff);
  79         printf("Size: %ld MB in %d sectors\n",
  80                info->size >> 10, info->sector_count);
  81 }
  82
  83 int __flashprog flash_erase(flash_info_t *info, int s_first, int s_last)
  84 {
  85         unsigned long flags;
  86         unsigned long start_time;
  87         uint16_t *fb, *sb;
  88         unsigned int i;
  89         int ret;
  90         uint16_t status;
  91
  92         if ((s_first < 0) || (s_first > s_last)
  93             || (s_last >= info->sector_count)) {
  94                 puts("Error: first and/or last sector out of range\n");
  95                 return ERR_INVAL;
  96         }
  97
  98         for (i = s_first; i < s_last; i++)
  99                 if (info->protect[i]) {
 100                         printf("Error: sector %d is protected\n", i);
 101                         return ERR_PROTECTED;
 102                 }
 103
 104         fb = (uint16_t *)uncached(info->start[0]);
 105
 106         dcache_flush_unlocked();
 107
 108         for (i = s_first; (i <= s_last) && !ctrlc(); i++) {
 109                 printf("Erasing sector %3d...", i);
 110
 111                 sb = (uint16_t *)uncached(info->start[i]);
 112
 113                 flags = disable_interrupts();
 114
 115                 start_time = get_timer(0);
 116
 117                 /* Unlock sector */
 118                 writew(0xaa, fb + 0x555);
 119                 writew(0x70, sb);
 120
 121                 /* Erase sector */
 122                 writew(0xaa, fb + 0x555);
 123                 writew(0x55, fb + 0xaaa);
 124                 writew(0x80, fb + 0x555);
 125                 writew(0xaa, fb + 0x555);
 126                 writew(0x55, fb + 0xaaa);
 127                 writew(0x30, sb);
 128
 129                 /* Wait for completion */
 130                 ret = ERR_OK;
 131                 do {
 132                         /* TODO: Timeout */
 133                         status = readw(sb);
 134                 } while ((status != 0xffff) && !(status & 0x28));
 135
 136                 writew(0xf0, fb);
 137
 138                 /*
 139                  * Make sure the command actually makes it to the bus
 140                  * before we re-enable interrupts.
 141                  */
 142                 readw(fb);
 143
 144                 if (flags)
 145                         enable_interrupts();
 146
 147                 if (status != 0xffff) {
 148                         printf("Flash erase error at address 0x%p: 0x%02x\n",
 149                                sb, status);
 150                         ret = ERR_PROG_ERROR;
 151                         break;
 152                 }
 153         }
 154
 155         if (ctrlc())
 156                 printf("User interrupt!\n");
 157
 158         return ERR_OK;
 159 }
 160
 161 int __flashprog write_buff(flash_info_t *info, uchar *src,
 162                            ulong addr, ulong count)
 163 {
 164         unsigned long flags;
 165         uint16_t *base, *p, *s, *end;
 166         uint16_t word, status;
 167         int ret = ERR_OK;
 168
 169         if (addr < info->start[0]
 170             || (addr + count) > (info->start[0] + info->size)
 171             || (addr + count) < addr) {
 172                 puts("Error: invalid address range\n");
 173                 return ERR_INVAL;
 174         }
 175
 176         if (addr & 1 || count & 1 || (unsigned int)src & 1) {
 177                 puts("Error: misaligned source, destination or count\n");
 178                 return ERR_ALIGN;
 179         }
 180
 181         base = (uint16_t *)uncached(info->start[0]);
 182         end = (uint16_t *)uncached(addr + count);
 183
 184         flags = disable_interrupts();
 185
 186         dcache_flush_unlocked();
 187         sync_write_buffer();
 188
 189         for (p = (uint16_t *)uncached(addr), s = (uint16_t *)src;
 190              p < end && !ctrlc(); p++, s++) {
 191                 word = *s;
 192
 193                 writew(0xaa, base + 0x555);
 194                 writew(0x55, base + 0xaaa);
 195                 writew(0xa0, base + 0x555);
 196                 writew(word, p);
 197
 198                 sync_write_buffer();
 199
 200                 /* Wait for completion */
 201                 do {
 202                         /* TODO: Timeout */
 203                         status = readw(p);
 204                 } while ((status != word) && !(status & 0x28));
 205
 206                 writew(0xf0, base);
 207                 readw(base);
 208
 209                 if (status != word) {
 210                         printf("Flash write error at address 0x%p: 0x%02x\n",
 211                                p, status);
 212                         ret = ERR_PROG_ERROR;
 213                         break;
 214                 }
 215         }
 216
 217         if (flags)
 218                 enable_interrupts();
 219
 220         return ret;
 221 }
 222
 223 #endif /* CONFIG_ATSTK1000_EXT_FLASH */