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 #include <errno.h>
  27
  28 #ifndef CONFIG_SYS_NAND_BASE_LIST
  29 #define CONFIG_SYS_NAND_BASE_LIST { CONFIG_SYS_NAND_BASE }
  30 #endif
  31
  32 DECLARE_GLOBAL_DATA_PTR;
  33
  34 int nand_curr_device = -1;
  35
  36
  37 nand_info_t nand_info[CONFIG_SYS_MAX_NAND_DEVICE];
  38
  39 #ifndef CONFIG_SYS_NAND_SELF_INIT
  40 static struct nand_chip nand_chip[CONFIG_SYS_MAX_NAND_DEVICE];
  41 static ulong base_address[CONFIG_SYS_MAX_NAND_DEVICE] = CONFIG_SYS_NAND_BASE_LIST;
  42 #endif
  43
  44 static char dev_name[CONFIG_SYS_MAX_NAND_DEVICE][8];
  45
  46 static unsigned long total_nand_size; /* in kiB */
  47
  48 /* Register an initialized NAND mtd device with the U-Boot NAND command. */
  49 int nand_register(int devnum)
  50 {
  51         struct mtd_info *mtd;
  52
  53         if (devnum >= CONFIG_SYS_MAX_NAND_DEVICE)
  54                 return -EINVAL;
  55
  56         mtd = &nand_info[devnum];
  57
  58         sprintf(dev_name[devnum], "nand%d", devnum);
  59         mtd->name = dev_name[devnum];
  60
  61 #ifdef CONFIG_MTD_DEVICE
  62         /*
  63          * Add MTD device so that we can reference it later
  64          * via the mtdcore infrastructure (e.g. ubi).
  65          */
  66         add_mtd_device(mtd);
  67 #endif
  68
  69         total_nand_size += mtd->size / 1024;
  70
  71         if (nand_curr_device == -1)
  72                 nand_curr_device = devnum;
  73
  74         return 0;
  75 }
  76
  77 #ifndef CONFIG_SYS_NAND_SELF_INIT
  78 static void nand_init_chip(int i)
  79 {
  80         struct mtd_info *mtd = &nand_info[i];
  81         struct nand_chip *nand = &nand_chip[i];
  82         ulong base_addr = base_address[i];
  83         int maxchips = CONFIG_SYS_NAND_MAX_CHIPS;
  84
  85         if (maxchips < 1)
  86                 maxchips = 1;
  87
  88         mtd->priv = nand;
  89         nand->IO_ADDR_R = nand->IO_ADDR_W = (void  __iomem *)base_addr;
  90
  91         if (board_nand_init(nand))
  92                 return;
  93
  94         if (nand_scan(mtd, maxchips))
  95                 return;
  96
  97         nand_register(i);
  98 }
  99 #endif
 100
 101 void nand_init(void)
 102 {
 103 #ifdef CONFIG_SYS_NAND_SELF_INIT
 104         board_nand_init();
 105 #else
 106         int i;
 107
 108         for (i = 0; i < CONFIG_SYS_MAX_NAND_DEVICE; i++)
 109                 nand_init_chip(i);
 110 #endif
 111
 112         printf("%lu MiB\n", total_nand_size / 1024);
 113
 114 #ifdef CONFIG_SYS_NAND_SELECT_DEVICE
 115         /*
 116          * Select the chip in the board/cpu specific driver
 117          */
 118         board_nand_select_device(nand_info[nand_curr_device].priv, nand_curr_device);
 119 #endif
 120 }