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