git.sur5r.net Git - u-boot/blob - drivers/mtd/nand/nand.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * (C) Copyright 2005
   4  * 2N Telekomunikace, a.s. <www.2n.cz>
   5  * Ladislav Michl <michl@2n.cz>
   6  */
   7
   8 #include <common.h>
   9 #include <nand.h>
  10 #include <errno.h>
  11 #include <linux/mtd/concat.h>
  12
  13 #ifndef CONFIG_SYS_NAND_BASE_LIST
  14 #define CONFIG_SYS_NAND_BASE_LIST { CONFIG_SYS_NAND_BASE }
  15 #endif
  16
  17 int nand_curr_device = -1;
  18
  19 static struct mtd_info *nand_info[CONFIG_SYS_MAX_NAND_DEVICE];
  20
  21 #ifndef CONFIG_SYS_NAND_SELF_INIT
  22 static struct nand_chip nand_chip[CONFIG_SYS_MAX_NAND_DEVICE];
  23 static ulong base_address[CONFIG_SYS_MAX_NAND_DEVICE] = CONFIG_SYS_NAND_BASE_LIST;
  24 #endif
  25
  26 static char dev_name[CONFIG_SYS_MAX_NAND_DEVICE][8];
  27
  28 static unsigned long total_nand_size; /* in kiB */
  29
  30 struct mtd_info *get_nand_dev_by_index(int dev)
  31 {
  32         if (dev < 0 || dev >= CONFIG_SYS_MAX_NAND_DEVICE || !nand_info[dev] ||
  33             !nand_info[dev]->name)
  34                 return NULL;
  35
  36         return nand_info[dev];
  37 }
  38
  39 int nand_mtd_to_devnum(struct mtd_info *mtd)
  40 {
  41         int i;
  42
  43         for (i = 0; i < CONFIG_SYS_MAX_NAND_DEVICE; i++) {
  44                 if (mtd && get_nand_dev_by_index(i) == mtd)
  45                         return i;
  46         }
  47
  48         return -ENODEV;
  49 }
  50
  51 /* Register an initialized NAND mtd device with the U-Boot NAND command. */
  52 int nand_register(int devnum, struct mtd_info *mtd)
  53 {
  54         if (devnum >= CONFIG_SYS_MAX_NAND_DEVICE)
  55                 return -EINVAL;
  56
  57         nand_info[devnum] = mtd;
  58
  59         sprintf(dev_name[devnum], "nand%d", devnum);
  60         mtd->name = dev_name[devnum];
  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         add_mtd_device(mtd);
  68 #endif
  69
  70         total_nand_size += mtd->size / 1024;
  71
  72         if (nand_curr_device == -1)
  73                 nand_curr_device = devnum;
  74
  75         return 0;
  76 }
  77
  78 #ifndef CONFIG_SYS_NAND_SELF_INIT
  79 static void nand_init_chip(int i)
  80 {
  81         struct nand_chip *nand = &nand_chip[i];
  82         struct mtd_info *mtd = nand_to_mtd(nand);
  83         ulong base_addr = base_address[i];
  84         int maxchips = CONFIG_SYS_NAND_MAX_CHIPS;
  85
  86         if (maxchips < 1)
  87                 maxchips = 1;
  88
  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, mtd);
  98 }
  99 #endif
 100
 101 #ifdef CONFIG_MTD_CONCAT
 102 static void create_mtd_concat(void)
 103 {
 104         struct mtd_info *nand_info_list[CONFIG_SYS_MAX_NAND_DEVICE];
 105         int nand_devices_found = 0;
 106         int i;
 107
 108         for (i = 0; i < CONFIG_SYS_MAX_NAND_DEVICE; i++) {
 109                 struct mtd_info *mtd = get_nand_dev_by_index(i);
 110                 if (mtd != NULL) {
 111                         nand_info_list[nand_devices_found] = mtd;
 112                         nand_devices_found++;
 113                 }
 114         }
 115         if (nand_devices_found > 1) {
 116                 struct mtd_info *mtd;
 117                 char c_mtd_name[16];
 118
 119                 /*
 120                  * We detected multiple devices. Concatenate them together.
 121                  */
 122                 sprintf(c_mtd_name, "nand%d", nand_devices_found);
 123                 mtd = mtd_concat_create(nand_info_list, nand_devices_found,
 124                                         c_mtd_name);
 125
 126                 if (mtd == NULL)
 127                         return;
 128
 129                 nand_register(nand_devices_found, mtd);
 130         }
 131
 132         return;
 133 }
 134 #else
 135 static void create_mtd_concat(void)
 136 {
 137 }
 138 #endif
 139
 140 unsigned long nand_size(void)
 141 {
 142         return total_nand_size;
 143 }
 144
 145 void nand_init(void)
 146 {
 147         static int initialized;
 148
 149         /*
 150          * Avoid initializing NAND Flash multiple times,
 151          * otherwise it will calculate a wrong total size.
 152          */
 153         if (initialized)
 154                 return;
 155         initialized = 1;
 156
 157 #ifdef CONFIG_SYS_NAND_SELF_INIT
 158         board_nand_init();
 159 #else
 160         int i;
 161
 162         for (i = 0; i < CONFIG_SYS_MAX_NAND_DEVICE; i++)
 163                 nand_init_chip(i);
 164 #endif
 165
 166 #ifdef CONFIG_SYS_NAND_SELECT_DEVICE
 167         /*
 168          * Select the chip in the board/cpu specific driver
 169          */
 170         board_nand_select_device(mtd_to_nand(get_nand_dev_by_index(nand_curr_device)),
 171                                  nand_curr_device);
 172 #endif
 173
 174         create_mtd_concat();
 175 }