drivers/mtd/nand/nand.c

   1 /*
   2  * (C) Copyright 2005
   3  * 2N Telekomunikace, a.s. <www.2n.cz>
   4  * Ladislav Michl <michl@2n.cz>
   5  *
   6  * See file CREDITS for list of people who contributed to this
   7  * project.
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License
  11  * version 2 as published by the Free Software Foundation.
  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 <nand.h>
  26
  27 #ifndef CONFIG_SYS_NAND_BASE_LIST
  28 #define CONFIG_SYS_NAND_BASE_LIST { CONFIG_SYS_NAND_BASE }
  29 #endif
  30
  31 DECLARE_GLOBAL_DATA_PTR;
  32
  33 int nand_curr_device = -1;
  34 nand_info_t nand_info[CONFIG_SYS_MAX_NAND_DEVICE];
  35
  36 static struct nand_chip nand_chip[CONFIG_SYS_MAX_NAND_DEVICE];
  37 static ulong base_address[CONFIG_SYS_MAX_NAND_DEVICE] = CONFIG_SYS_NAND_BASE_LIST;
  38
  39 static const char default_nand_name[] = "nand";
  40 static __attribute__((unused)) char dev_name[CONFIG_SYS_MAX_NAND_DEVICE][8];
  41
  42 static void nand_init_chip(struct mtd_info *mtd, struct nand_chip *nand,
  43                            ulong base_addr)
  44 {
  45         int maxchips = CONFIG_SYS_NAND_MAX_CHIPS;
  46         int __attribute__((unused)) i = 0;
  47
  48         if (maxchips < 1)
  49                 maxchips = 1;
  50         mtd->priv = nand;
  51
  52         nand->IO_ADDR_R = nand->IO_ADDR_W = (void  __iomem *)base_addr;
  53         if (board_nand_init(nand) == 0) {
  54                 if (nand_scan(mtd, maxchips) == 0) {
  55                         if (!mtd->name)
  56                                 mtd->name = (char *)default_nand_name;
  57 #ifdef CONFIG_NEEDS_MANUAL_RELOC
  58                         else
  59                                 mtd->name += gd->reloc_off;
  60 #endif
  61
  62 #ifdef CONFIG_MTD_DEVICE
  63                         /*
  64                          * Add MTD device so that we can reference it later
  65                          * via the mtdcore infrastructure (e.g. ubi).
  66                          */
  67                         sprintf(dev_name[i], "nand%d", i);
  68                         mtd->name = dev_name[i++];
  69                         add_mtd_device(mtd);
  70 #endif
  71                 } else
  72                         mtd->name = NULL;
  73         } else {
  74                 mtd->name = NULL;
  75                 mtd->size = 0;
  76         }
  77
  78 }
  79
  80 void nand_init(void)
  81 {
  82         int i;
  83         unsigned int size = 0;
  84         for (i = 0; i < CONFIG_SYS_MAX_NAND_DEVICE; i++) {
  85                 nand_init_chip(&nand_info[i], &nand_chip[i], base_address[i]);
  86                 size += nand_info[i].size / 1024;
  87                 if (nand_curr_device == -1)
  88                         nand_curr_device = i;
  89         }
  90         printf("%u MiB\n", size / 1024);
  91
  92 #ifdef CONFIG_SYS_NAND_SELECT_DEVICE
  93         /*
  94          * Select the chip in the board/cpu specific driver
  95          */
  96         board_nand_select_device(nand_info[nand_curr_device].priv, nand_curr_device);
  97 #endif
  98 }