drivers/mtd/maps/ts5500_flash.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * ts5500_flash.c -- MTD map driver for Technology Systems TS-5500 board
   4  *
   5  * Copyright (C) 2004 Sean Young <sean@mess.org>
   6  *
   7  * Note:
   8  * - In order for detection to work, jumper 3 must be set.
   9  * - Drive A and B use the resident flash disk (RFD) flash translation layer.
  10  * - If you have created your own jffs file system and the bios overwrites
  11  *   it during boot, try disabling Drive A: and B: in the boot order.
  12  */
  13
  14 #include <linux/init.h>
  15 #include <linux/module.h>
  16 #include <linux/kernel.h>
  17 #include <linux/mtd/map.h>
  18 #include <linux/mtd/mtd.h>
  19 #include <linux/mtd/partitions.h>
  20 #include <linux/types.h>
  21
  22
  23 #define WINDOW_ADDR     0x09400000
  24 #define WINDOW_SIZE     0x00200000
  25
  26 static struct map_info ts5500_map = {
  27         .name = "TS-5500 Flash",
  28         .size = WINDOW_SIZE,
  29         .bankwidth = 1,
  30         .phys = WINDOW_ADDR
  31 };
  32
  33 static const struct mtd_partition ts5500_partitions[] = {
  34         {
  35                 .name = "Drive A",
  36                 .offset = 0,
  37                 .size = 0x0e0000
  38         },
  39         {
  40                 .name = "BIOS",
  41                 .offset = 0x0e0000,
  42                 .size = 0x020000,
  43         },
  44         {
  45                 .name = "Drive B",
  46                 .offset = 0x100000,
  47                 .size = 0x100000
  48         }
  49 };
  50
  51 #define NUM_PARTITIONS ARRAY_SIZE(ts5500_partitions)
  52
  53 static struct mtd_info *mymtd;
  54
  55 static int __init init_ts5500_map(void)
  56 {
  57         int rc = 0;
  58
  59         ts5500_map.virt = ioremap(ts5500_map.phys, ts5500_map.size);
  60
  61         if (!ts5500_map.virt) {
  62                 printk(KERN_ERR "Failed to ioremap\n");
  63                 rc = -EIO;
  64                 goto err2;
  65         }
  66
  67         simple_map_init(&ts5500_map);
  68
  69         mymtd = do_map_probe("jedec_probe", &ts5500_map);
  70         if (!mymtd)
  71                 mymtd = do_map_probe("map_rom", &ts5500_map);
  72
  73         if (!mymtd) {
  74                 rc = -ENXIO;
  75                 goto err1;
  76         }
  77
  78         mymtd->owner = THIS_MODULE;
  79         mtd_device_register(mymtd, ts5500_partitions, NUM_PARTITIONS);
  80
  81         return 0;
  82
  83 err1:
  84         iounmap(ts5500_map.virt);
  85 err2:
  86         return rc;
  87 }
  88
  89 static void __exit cleanup_ts5500_map(void)
  90 {
  91         if (mymtd) {
  92                 mtd_device_unregister(mymtd);
  93                 map_destroy(mymtd);
  94         }
  95
  96         if (ts5500_map.virt) {
  97                 iounmap(ts5500_map.virt);
  98                 ts5500_map.virt = NULL;
  99         }
 100 }
 101
 102 module_init(init_ts5500_map);
 103 module_exit(cleanup_ts5500_map);
 104
 105 MODULE_LICENSE("GPL");
 106 MODULE_AUTHOR("Sean Young <sean@mess.org>");
 107 MODULE_DESCRIPTION("MTD map driver for Technology Systems TS-5500 board");
 108