drivers/mtd/maps/lubbock-flash.c

   1 /*
   2  * $Id: lubbock-flash.c,v 1.9 2003/06/23 11:48:18 dwmw2 Exp $
   3  *
   4  * Map driver for the Lubbock developer platform.
   5  *
   6  * Author:      Nicolas Pitre
   7  * Copyright:   (C) 2001 MontaVista Software Inc.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/types.h>
  16 #include <linux/kernel.h>
  17 #include <linux/init.h>
  18 #include <asm/io.h>
  19 #include <linux/mtd/mtd.h>
  20 #include <linux/mtd/map.h>
  21 #include <linux/mtd/partitions.h>
  22 #include <asm/hardware.h>
  23
  24
  25 #define ROM_ADDR        0x00000000
  26 #define FLASH_ADDR      0x04000000
  27
  28 #define WINDOW_SIZE     64*1024*1024
  29
  30 static struct map_info lubbock_maps[2] = { {
  31         .size =         WINDOW_SIZE,
  32         .phys =         0x00000000,
  33 }, {
  34         .size =         WINDOW_SIZE,
  35         .phys =         0x04000000,
  36 } };
  37
  38 static struct mtd_partition lubbock_partitions[] = {
  39         {
  40                 .name =         "Bootloader",
  41                 .size =         0x00040000,
  42                 .offset =       0,
  43                 .mask_flags =   MTD_WRITEABLE  /* force read-only */
  44         },{
  45                 .name =         "Kernel",
  46                 .size =         0x00100000,
  47                 .offset =       0x00040000,
  48         },{
  49                 .name =         "Filesystem",
  50                 .size =         MTDPART_SIZ_FULL,
  51                 .offset =       0x00140000
  52         }
  53 };
  54
  55 static struct mtd_info *mymtds[2];
  56 static struct mtd_partition *parsed_parts[2];
  57 static int nr_parsed_parts[2];
  58
  59 static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
  60
  61 static int __init init_lubbock(void)
  62 {
  63         int flashboot = (LUB_CONF_SWITCHES & 1);
  64         int ret = 0, i;
  65
  66         lubbock_maps[0].buswidth = lubbock_maps[1].buswidth =
  67                 (BOOT_DEF & 1) ? 2 : 4;
  68
  69         /* Compensate for the nROMBT switch which swaps the flash banks */
  70         printk(KERN_NOTICE "Lubbock configured to boot from %s (bank %d)\n",
  71                flashboot?"Flash":"ROM", flashboot);
  72
  73         lubbock_maps[flashboot^1].name = "Lubbock Application Flash";
  74         lubbock_maps[flashboot].name = "Lubbock Boot ROM";
  75
  76         for (i = 0; i < 2; i++) {
  77                 lubbock_maps[i].virt = (unsigned long)ioremap(lubbock_maps[i].phys, WINDOW_SIZE);
  78                 if (!lubbock_maps[i].virt) {
  79                         printk(KERN_WARNING "Failed to ioremap %s\n", lubbock_maps[i].name);
  80                         if (!ret)
  81                                 ret = -ENOMEM;
  82                         continue;
  83                 }
  84                 simple_map_init(&lubbock_maps[i]);
  85
  86                 printk(KERN_NOTICE "Probing %s at physical address 0x%08lx (%d-bit buswidth)\n",
  87                        lubbock_maps[i].name, lubbock_maps[i].phys,
  88                        lubbock_maps[i].buswidth * 8);
  89
  90                 mymtds[i] = do_map_probe("cfi_probe", &lubbock_maps[i]);
  91
  92                 if (!mymtds[i]) {
  93                         iounmap((void *)lubbock_maps[i].virt);
  94                         if (!ret)
  95                                 ret = -EIO;
  96                         continue;
  97                 }
  98                 mymtds[i]->owner = THIS_MODULE;
  99
 100                 ret = parse_mtd_partitions(mymtds[i], probes,
 101                                            &parsed_parts[i], 0);
 102
 103                 if (ret > 0)
 104                         nr_parsed_parts[i] = ret;
 105         }
 106
 107         if (!mymtds[0] && !mymtds[1])
 108                 return ret;
 109
 110         for (i = 0; i < 2; i++) {
 111                 if (!mymtds[i]) {
 112                         printk(KERN_WARNING "%s is absent. Skipping\n", lubbock_maps[i].name);
 113                 } else if (nr_parsed_parts[i]) {
 114                         add_mtd_partitions(mymtds[i], parsed_parts[i], nr_parsed_parts[i]);
 115                 } else if (!i) {
 116                         printk("Using static partitions on %s\n", lubbock_maps[i].name);
 117                         add_mtd_partitions(mymtds[i], lubbock_partitions, ARRAY_SIZE(lubbock_partitions));
 118                 } else {
 119                         printk("Registering %s as whole device\n", lubbock_maps[i].name);
 120                         add_mtd_device(mymtds[i]);
 121                 }
 122         }
 123         return 0;
 124 }
 125
 126 static void __exit cleanup_lubbock(void)
 127 {
 128         int i;
 129         for (i = 0; i < 2; i++) {
 130                 if (!mymtds[i])
 131                         continue;
 132
 133                 if (nr_parsed_parts[i] || !i)
 134                         del_mtd_partitions(mymtds[i]);
 135                 else
 136                         del_mtd_device(mymtds[i]);
 137
 138                 map_destroy(mymtds[i]);
 139                 iounmap((void *)lubbock_maps[i].virt);
 140
 141                 if (parsed_parts[i])
 142                         kfree(parsed_parts[i]);
 143         }
 144 }
 145
 146 module_init(init_lubbock);
 147 module_exit(cleanup_lubbock);
 148
 149 MODULE_LICENSE("GPL");
 150 MODULE_AUTHOR("Nicolas Pitre <nico@cam.org>");
 151 MODULE_DESCRIPTION("MTD map driver for Intel Lubbock");