drivers/mtd/maps/netsc520.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /* netsc520.c -- MTD map driver for AMD NetSc520 Demonstration Board
   3  *
   4  * Copyright (C) 2001 Mark Langsdorf (mark.langsdorf@amd.com)
   5  *      based on sc520cdp.c by Sysgo Real-Time Solutions GmbH
   6  *
   7  * The NetSc520 is a demonstration board for the Elan Sc520 processor available
   8  * from AMD.  It has a single back of 16 megs of 32-bit Flash ROM and another
   9  * 16 megs of SDRAM.
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/types.h>
  14 #include <linux/kernel.h>
  15 #include <linux/init.h>
  16 #include <asm/io.h>
  17 #include <linux/mtd/mtd.h>
  18 #include <linux/mtd/map.h>
  19 #include <linux/mtd/partitions.h>
  20
  21
  22 /*
  23 ** The single, 16 megabyte flash bank is divided into four virtual
  24 ** partitions.  The first partition is 768 KiB and is intended to
  25 ** store the kernel image loaded by the bootstrap loader.  The second
  26 ** partition is 256 KiB and holds the BIOS image.  The third
  27 ** partition is 14.5 MiB and is intended for the flash file system
  28 ** image.  The last partition is 512 KiB and contains another copy
  29 ** of the BIOS image and the reset vector.
  30 **
  31 ** Only the third partition should be mounted.  The first partition
  32 ** should not be mounted, but it can erased and written to using the
  33 ** MTD character routines.  The second and fourth partitions should
  34 ** not be touched - it is possible to corrupt the BIOS image by
  35 ** mounting these partitions, and potentially the board will not be
  36 ** recoverable afterwards.
  37 */
  38
  39 /* partition_info gives details on the logical partitions that the split the
  40  * single flash device into. If the size if zero we use up to the end of the
  41  * device. */
  42 static const struct mtd_partition partition_info[] = {
  43     {
  44             .name = "NetSc520 boot kernel",
  45             .offset = 0,
  46             .size = 0xc0000
  47     },
  48     {
  49             .name = "NetSc520 Low BIOS",
  50             .offset = 0xc0000,
  51             .size = 0x40000
  52     },
  53     {
  54             .name = "NetSc520 file system",
  55             .offset = 0x100000,
  56             .size = 0xe80000
  57     },
  58     {
  59             .name = "NetSc520 High BIOS",
  60             .offset = 0xf80000,
  61             .size = 0x80000
  62     },
  63 };
  64 #define NUM_PARTITIONS ARRAY_SIZE(partition_info)
  65
  66 #define WINDOW_SIZE     0x00100000
  67 #define WINDOW_ADDR     0x00200000
  68
  69 static struct map_info netsc520_map = {
  70         .name = "netsc520 Flash Bank",
  71         .size = WINDOW_SIZE,
  72         .bankwidth = 4,
  73         .phys = WINDOW_ADDR,
  74 };
  75
  76 #define NUM_FLASH_BANKS ARRAY_SIZE(netsc520_map)
  77
  78 static struct mtd_info *mymtd;
  79
  80 static int __init init_netsc520(void)
  81 {
  82         printk(KERN_NOTICE "NetSc520 flash device: 0x%Lx at 0x%Lx\n",
  83                         (unsigned long long)netsc520_map.size,
  84                         (unsigned long long)netsc520_map.phys);
  85         netsc520_map.virt = ioremap(netsc520_map.phys, netsc520_map.size);
  86
  87         if (!netsc520_map.virt) {
  88                 printk("Failed to ioremap\n");
  89                 return -EIO;
  90         }
  91
  92         simple_map_init(&netsc520_map);
  93
  94         mymtd = do_map_probe("cfi_probe", &netsc520_map);
  95         if(!mymtd)
  96                 mymtd = do_map_probe("map_ram", &netsc520_map);
  97         if(!mymtd)
  98                 mymtd = do_map_probe("map_rom", &netsc520_map);
  99
 100         if (!mymtd) {
 101                 iounmap(netsc520_map.virt);
 102                 return -ENXIO;
 103         }
 104
 105         mymtd->owner = THIS_MODULE;
 106         mtd_device_register(mymtd, partition_info, NUM_PARTITIONS);
 107         return 0;
 108 }
 109
 110 static void __exit cleanup_netsc520(void)
 111 {
 112         if (mymtd) {
 113                 mtd_device_unregister(mymtd);
 114                 map_destroy(mymtd);
 115         }
 116         if (netsc520_map.virt) {
 117                 iounmap(netsc520_map.virt);
 118                 netsc520_map.virt = NULL;
 119         }
 120 }
 121
 122 module_init(init_netsc520);
 123 module_exit(cleanup_netsc520);
 124
 125 MODULE_LICENSE("GPL");
 126 MODULE_AUTHOR("Mark Langsdorf <mark.langsdorf@amd.com>");
 127 MODULE_DESCRIPTION("MTD map driver for AMD NetSc520 Demonstration Board");