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 static struct mtd_info *nand_info[CONFIG_SYS_MAX_NAND_DEVICE];
  23
  24 #ifndef CONFIG_SYS_NAND_SELF_INIT
  25 static struct nand_chip nand_chip[CONFIG_SYS_MAX_NAND_DEVICE];
  26 static ulong base_address[CONFIG_SYS_MAX_NAND_DEVICE] = CONFIG_SYS_NAND_BASE_LIST;
  27 #endif
  28
  29 static char dev_name[CONFIG_SYS_MAX_NAND_DEVICE][8];
  30
  31 static unsigned long total_nand_size; /* in kiB */
  32
  33 struct mtd_info *get_nand_dev_by_index(int dev)
  34 {
  35         if (dev < 0 || dev >= CONFIG_SYS_MAX_NAND_DEVICE || !nand_info[dev] ||
  36             !nand_info[dev]->name)
  37                 return NULL;
  38
  39         return nand_info[dev];
  40 }
  41
  42 int nand_mtd_to_devnum(struct mtd_info *mtd)
  43 {
  44         int i;
  45
  46         for (i = 0; i < CONFIG_SYS_MAX_NAND_DEVICE; i++) {
  47                 if (mtd && get_nand_dev_by_index(i) == mtd)
  48                         return i;
  49         }
  50
  51         return -ENODEV;
  52 }
  53
  54 /* Register an initialized NAND mtd device with the U-Boot NAND command. */
  55 int nand_register(int devnum, struct mtd_info *mtd)
  56 {
  57         if (devnum >= CONFIG_SYS_MAX_NAND_DEVICE)
  58                 return -EINVAL;
  59
  60         nand_info[devnum] = mtd;
  61
  62         sprintf(dev_name[devnum], "nand%d", devnum);
  63         mtd->name = dev_name[devnum];
  64
  65 #ifdef CONFIG_MTD_DEVICE
  66         /*
  67          * Add MTD device so that we can reference it later
  68          * via the mtdcore infrastructure (e.g. ubi).
  69          */
  70         add_mtd_device(mtd);
  71 #endif
  72
  73         total_nand_size += mtd->size / 1024;
  74
  75         if (nand_curr_device == -1)
  76                 nand_curr_device = devnum;
  77
  78         return 0;
  79 }
  80
  81 #ifndef CONFIG_SYS_NAND_SELF_INIT
  82 static void nand_init_chip(int i)
  83 {
  84         struct nand_chip *nand = &nand_chip[i];
  85         struct mtd_info *mtd = nand_to_mtd(nand);
  86         ulong base_addr = base_address[i];
  87         int maxchips = CONFIG_SYS_NAND_MAX_CHIPS;
  88
  89         if (maxchips < 1)
  90                 maxchips = 1;
  91
  92         nand->IO_ADDR_R = nand->IO_ADDR_W = (void  __iomem *)base_addr;
  93
  94         if (board_nand_init(nand))
  95                 return;
  96
  97         if (nand_scan(mtd, maxchips))
  98                 return;
  99
 100         nand_register(i, mtd);
 101 }
 102 #endif
 103
 104 #ifdef CONFIG_MTD_CONCAT
 105 static void create_mtd_concat(void)
 106 {
 107         struct mtd_info *nand_info_list[CONFIG_SYS_MAX_NAND_DEVICE];
 108         int nand_devices_found = 0;
 109         int i;
 110
 111         for (i = 0; i < CONFIG_SYS_MAX_NAND_DEVICE; i++) {
 112                 struct mtd_info *mtd = get_nand_dev_by_index(i);
 113                 if (mtd != NULL) {
 114                         nand_info_list[nand_devices_found] = mtd;
 115                         nand_devices_found++;
 116                 }
 117         }
 118         if (nand_devices_found > 1) {
 119                 struct mtd_info *mtd;
 120                 char c_mtd_name[16];
 121
 122                 /*
 123                  * We detected multiple devices. Concatenate them together.
 124                  */
 125                 sprintf(c_mtd_name, "nand%d", nand_devices_found);
 126                 mtd = mtd_concat_create(nand_info_list, nand_devices_found,
 127                                         c_mtd_name);
 128
 129                 if (mtd == NULL)
 130                         return;
 131
 132                 nand_register(nand_devices_found, mtd);
 133         }
 134
 135         return;
 136 }
 137 #else
 138 static void create_mtd_concat(void)
 139 {
 140 }
 141 #endif
 142
 143 unsigned long nand_size(void)
 144 {
 145         return total_nand_size;
 146 }
 147
 148 void nand_init(void)
 149 {
 150         static int initialized;
 151
 152         /*
 153          * Avoid initializing NAND Flash multiple times,
 154          * otherwise it will calculate a wrong total size.
 155          */
 156         if (initialized)
 157                 return;
 158         initialized = 1;
 159
 160 #ifdef CONFIG_SYS_NAND_SELF_INIT
 161         board_nand_init();
 162 #else
 163         int i;
 164
 165         for (i = 0; i < CONFIG_SYS_MAX_NAND_DEVICE; i++)
 166                 nand_init_chip(i);
 167 #endif
 168
 169 #ifdef CONFIG_SYS_NAND_SELECT_DEVICE
 170         /*
 171          * Select the chip in the board/cpu specific driver
 172          */
 173         board_nand_select_device(mtd_to_nand(get_nand_dev_by_index(nand_curr_device)),
 174                                  nand_curr_device);
 175 #endif
 176
 177         create_mtd_concat();
 178 }