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  * SPDX-License-Identifier:     GPL-2.0
   7  */
   8
   9 #include <common.h>
  10 #include <nand.h>
  11 #include <errno.h>
  12 #include <linux/mtd/concat.h>
  13
  14 #ifndef CONFIG_SYS_NAND_BASE_LIST
  15 #define CONFIG_SYS_NAND_BASE_LIST { CONFIG_SYS_NAND_BASE }
  16 #endif
  17
  18 DECLARE_GLOBAL_DATA_PTR;
  19
  20 int nand_curr_device = -1;
  21
  22
  23 struct mtd_info *nand_info[CONFIG_SYS_MAX_NAND_DEVICE];
  24
  25 #ifndef CONFIG_SYS_NAND_SELF_INIT
  26 static struct nand_chip nand_chip[CONFIG_SYS_MAX_NAND_DEVICE];
  27 static ulong base_address[CONFIG_SYS_MAX_NAND_DEVICE] = CONFIG_SYS_NAND_BASE_LIST;
  28 #endif
  29
  30 static char dev_name[CONFIG_SYS_MAX_NAND_DEVICE][8];
  31
  32 static unsigned long total_nand_size; /* in kiB */
  33
  34 int nand_mtd_to_devnum(struct mtd_info *mtd)
  35 {
  36         int i;
  37
  38         for (i = 0; i < ARRAY_SIZE(nand_info); i++) {
  39                 if (mtd && nand_info[i] == mtd)
  40                         return i;
  41         }
  42
  43         return -ENODEV;
  44 }
  45
  46 /* Register an initialized NAND mtd device with the U-Boot NAND command. */
  47 int nand_register(int devnum, struct mtd_info *mtd)
  48 {
  49         if (devnum >= CONFIG_SYS_MAX_NAND_DEVICE)
  50                 return -EINVAL;
  51
  52         nand_info[devnum] = mtd;
  53
  54         sprintf(dev_name[devnum], "nand%d", devnum);
  55         mtd->name = dev_name[devnum];
  56
  57 #ifdef CONFIG_MTD_DEVICE
  58         /*
  59          * Add MTD device so that we can reference it later
  60          * via the mtdcore infrastructure (e.g. ubi).
  61          */
  62         add_mtd_device(mtd);
  63 #endif
  64
  65         total_nand_size += mtd->size / 1024;
  66
  67         if (nand_curr_device == -1)
  68                 nand_curr_device = devnum;
  69
  70         return 0;
  71 }
  72
  73 #ifndef CONFIG_SYS_NAND_SELF_INIT
  74 static void nand_init_chip(int i)
  75 {
  76         struct nand_chip *nand = &nand_chip[i];
  77         struct mtd_info *mtd = nand_to_mtd(nand);
  78         ulong base_addr = base_address[i];
  79         int maxchips = CONFIG_SYS_NAND_MAX_CHIPS;
  80
  81         if (maxchips < 1)
  82                 maxchips = 1;
  83
  84         nand->IO_ADDR_R = nand->IO_ADDR_W = (void  __iomem *)base_addr;
  85
  86         if (board_nand_init(nand))
  87                 return;
  88
  89         if (nand_scan(mtd, maxchips))
  90                 return;
  91
  92         nand_register(i, mtd);
  93 }
  94 #endif
  95
  96 #ifdef CONFIG_MTD_CONCAT
  97 static void create_mtd_concat(void)
  98 {
  99         struct mtd_info *nand_info_list[CONFIG_SYS_MAX_NAND_DEVICE];
 100         int nand_devices_found = 0;
 101         int i;
 102
 103         for (i = 0; i < CONFIG_SYS_MAX_NAND_DEVICE; i++) {
 104                 if (nand_info[i] != NULL) {
 105                         nand_info_list[nand_devices_found] = nand_info[i];
 106                         nand_devices_found++;
 107                 }
 108         }
 109         if (nand_devices_found > 1) {
 110                 struct mtd_info *mtd;
 111                 char c_mtd_name[16];
 112
 113                 /*
 114                  * We detected multiple devices. Concatenate them together.
 115                  */
 116                 sprintf(c_mtd_name, "nand%d", nand_devices_found);
 117                 mtd = mtd_concat_create(nand_info_list, nand_devices_found,
 118                                         c_mtd_name);
 119
 120                 if (mtd == NULL)
 121                         return;
 122
 123                 nand_register(nand_devices_found, mtd);
 124         }
 125
 126         return;
 127 }
 128 #else
 129 static void create_mtd_concat(void)
 130 {
 131 }
 132 #endif
 133
 134 void nand_init(void)
 135 {
 136 #ifdef CONFIG_SYS_NAND_SELF_INIT
 137         board_nand_init();
 138 #else
 139         int i;
 140
 141         for (i = 0; i < CONFIG_SYS_MAX_NAND_DEVICE; i++)
 142                 nand_init_chip(i);
 143 #endif
 144
 145         printf("%lu MiB\n", total_nand_size / 1024);
 146
 147 #ifdef CONFIG_SYS_NAND_SELECT_DEVICE
 148         /*
 149          * Select the chip in the board/cpu specific driver
 150          */
 151         board_nand_select_device(mtd_to_nand(nand_info[nand_curr_device]),
 152                                  nand_curr_device);
 153 #endif
 154
 155         create_mtd_concat();
 156 }