board/dave/PPChameleonEVB/flash.c

   1 /*
   2  * (C) Copyright 2001
   3  * Stefan Roese, esd gmbh germany, stefan.roese@esd-electronics.com
   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 #include <common.h>
  25 #include <ppc4xx.h>
  26 #include <asm/processor.h>
  27
  28 /*
  29  * include common flash code (for esd boards)
  30  */
  31 #include "../common/flash.c"
  32
  33 /*-----------------------------------------------------------------------
  34  * Functions
  35  */
  36 static ulong flash_get_size (vu_long * addr, flash_info_t * info);
  37 static void flash_get_offsets (ulong base, flash_info_t * info);
  38
  39 /*-----------------------------------------------------------------------
  40  */
  41
  42 unsigned long flash_init (void)
  43 {
  44 #ifdef __DEBUG_START_FROM_SRAM__
  45         return CONFIG_SYS_DUMMY_FLASH_SIZE;
  46 #else
  47         unsigned long size;
  48         int i;
  49         uint pbcr;
  50         unsigned long base;
  51         int size_val = 0;
  52
  53         debug("[%s, %d] Entering ...\n", __FUNCTION__, __LINE__);
  54         debug("[%s, %d] flash_info = 0x%08X ...\n", __FUNCTION__, __LINE__, flash_info);
  55
  56         /* Init: no FLASHes known */
  57         for (i=0; i<CONFIG_SYS_MAX_FLASH_BANKS; ++i) {
  58                 flash_info[i].flash_id = FLASH_UNKNOWN;
  59         }
  60
  61         /* Static FLASH Bank configuration here - FIXME XXX */
  62
  63         debug("[%s, %d] Calling flash_get_size ...\n", __FUNCTION__, __LINE__);
  64         size = flash_get_size((vu_long *)FLASH_BASE0_PRELIM, &flash_info[0]);
  65
  66         if (flash_info[0].flash_id == FLASH_UNKNOWN) {
  67                 printf ("## Unknown FLASH on Bank 0 - Size = 0x%08lx = %ld MB\n",
  68                         size, size<<20);
  69         }
  70
  71         debug("[%s, %d] Test point ...\n", __FUNCTION__, __LINE__);
  72
  73         /* Setup offsets */
  74         flash_get_offsets (-size, &flash_info[0]);
  75         debug("[%s, %d] Test point ...\n", __FUNCTION__, __LINE__);
  76
  77         /* Re-do sizing to get full correct info */
  78         mtdcr(ebccfga, pb0cr);
  79         pbcr = mfdcr(ebccfgd);
  80         mtdcr(ebccfga, pb0cr);
  81         base = -size;
  82         switch (size) {
  83         case 1 << 20:
  84                 size_val = 0;
  85                 break;
  86         case 2 << 20:
  87                 size_val = 1;
  88                 break;
  89         case 4 << 20:
  90                 size_val = 2;
  91                 break;
  92         case 8 << 20:
  93                 size_val = 3;
  94                 break;
  95         case 16 << 20:
  96                 size_val = 4;
  97                 break;
  98         }
  99         pbcr = (pbcr & 0x0001ffff) | base | (size_val << 17);
 100         mtdcr(ebccfgd, pbcr);
 101         debug("[%s, %d] Test point ...\n", __FUNCTION__, __LINE__);
 102
 103         /* Monitor protection ON by default */
 104         (void)flash_protect(FLAG_PROTECT_SET,
 105                             -CONFIG_SYS_MONITOR_LEN,
 106                             0xffffffff,
 107                             &flash_info[0]);
 108
 109         debug("[%s, %d] Test point ...\n", __FUNCTION__, __LINE__);
 110         flash_info[0].size  = size;
 111
 112         return (size);
 113 #endif
 114 }