drivers/mtd/maps/lubbock-flash.c

   1 /*
   2  * $Id: lubbock-flash.c,v 1.21 2005/11/07 11:14:27 gleixner 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
  19 #include <linux/mtd/mtd.h>
  20 #include <linux/mtd/map.h>
  21 #include <linux/mtd/partitions.h>
  22
  23 #include <asm/io.h>
  24 #include <asm/hardware.h>
  25 #include <asm/arch/pxa-regs.h>
  26 #include <asm/arch/lubbock.h>
  27 #include <asm/cacheflush.h>
  28
  29 #define ROM_ADDR        0x00000000
  30 #define FLASH_ADDR      0x04000000
  31
  32 #define WINDOW_SIZE     64*1024*1024
  33
  34 static void lubbock_map_inval_cache(struct map_info *map, unsigned long from, ssize_t len)
  35 {
  36         flush_ioremap_region(map->phys, map->cached, from, len);
  37 }
  38
  39 static struct map_info lubbock_maps[2] = { {
  40         .size =         WINDOW_SIZE,
  41         .phys =         0x00000000,
  42         .inval_cache =  lubbock_map_inval_cache,
  43 }, {
  44         .size =         WINDOW_SIZE,
  45         .phys =         0x04000000,
  46         .inval_cache =  lubbock_map_inval_cache,
  47 } };
  48
  49 static struct mtd_partition lubbock_partitions[] = {
  50         {
  51                 .name =         "Bootloader",
  52                 .size =         0x00040000,
  53                 .offset =       0,
  54                 .mask_flags =   MTD_WRITEABLE  /* force read-only */
  55         },{
  56                 .name =         "Kernel",
  57                 .size =         0x00100000,
  58                 .offset =       0x00040000,
  59         },{
  60                 .name =         "Filesystem",
  61                 .size =         MTDPART_SIZ_FULL,
  62                 .offset =       0x00140000
  63         }
  64 };
  65
  66 static struct mtd_info *mymtds[2];
  67 static struct mtd_partition *parsed_parts[2];
  68 static int nr_parsed_parts[2];
  69
  70 static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
  71
  72 static int __init init_lubbock(void)
  73 {
  74         int flashboot = (LUB_CONF_SWITCHES & 1);
  75         int ret = 0, i;
  76
  77         lubbock_maps[0].bankwidth = lubbock_maps[1].bankwidth =
  78                 (BOOT_DEF & 1) ? 2 : 4;
  79
  80         /* Compensate for the nROMBT switch which swaps the flash banks */
  81         printk(KERN_NOTICE "Lubbock configured to boot from %s (bank %d)\n",
  82                flashboot?"Flash":"ROM", flashboot);
  83
  84         lubbock_maps[flashboot^1].name = "Lubbock Application Flash";
  85         lubbock_maps[flashboot].name = "Lubbock Boot ROM";
  86
  87         for (i = 0; i < 2; i++) {
  88                 lubbock_maps[i].virt = ioremap(lubbock_maps[i].phys, WINDOW_SIZE);
  89                 if (!lubbock_maps[i].virt) {
  90                         printk(KERN_WARNING "Failed to ioremap %s\n", lubbock_maps[i].name);
  91                         if (!ret)
  92                                 ret = -ENOMEM;
  93                         continue;
  94                 }
  95                 lubbock_maps[i].cached = ioremap_cached(lubbock_maps[i].phys, WINDOW_SIZE);
  96                 if (!lubbock_maps[i].cached)
  97                         printk(KERN_WARNING "Failed to ioremap cached %s\n", lubbock_maps[i].name);
  98                 simple_map_init(&lubbock_maps[i]);
  99
 100                 printk(KERN_NOTICE "Probing %s at physical address 0x%08lx (%d-bit bankwidth)\n",
 101                        lubbock_maps[i].name, lubbock_maps[i].phys,
 102                        lubbock_maps[i].bankwidth * 8);
 103
 104                 mymtds[i] = do_map_probe("cfi_probe", &lubbock_maps[i]);
 105
 106                 if (!mymtds[i]) {
 107                         iounmap((void *)lubbock_maps[i].virt);
 108                         if (lubbock_maps[i].cached)
 109                                 iounmap(lubbock_maps[i].cached);
 110                         if (!ret)
 111                                 ret = -EIO;
 112                         continue;
 113                 }
 114                 mymtds[i]->owner = THIS_MODULE;
 115
 116                 ret = parse_mtd_partitions(mymtds[i], probes,
 117                                            &parsed_parts[i], 0);
 118
 119                 if (ret > 0)
 120                         nr_parsed_parts[i] = ret;
 121         }
 122
 123         if (!mymtds[0] && !mymtds[1])
 124                 return ret;
 125
 126         for (i = 0; i < 2; i++) {
 127                 if (!mymtds[i]) {
 128                         printk(KERN_WARNING "%s is absent. Skipping\n", lubbock_maps[i].name);
 129                 } else if (nr_parsed_parts[i]) {
 130                         add_mtd_partitions(mymtds[i], parsed_parts[i], nr_parsed_parts[i]);
 131                 } else if (!i) {
 132                         printk("Using static partitions on %s\n", lubbock_maps[i].name);
 133                         add_mtd_partitions(mymtds[i], lubbock_partitions, ARRAY_SIZE(lubbock_partitions));
 134                 } else {
 135                         printk("Registering %s as whole device\n", lubbock_maps[i].name);
 136                         add_mtd_device(mymtds[i]);
 137                 }
 138         }
 139         return 0;
 140 }
 141
 142 static void __exit cleanup_lubbock(void)
 143 {
 144         int i;
 145         for (i = 0; i < 2; i++) {
 146                 if (!mymtds[i])
 147                         continue;
 148
 149                 if (nr_parsed_parts[i] || !i)
 150                         del_mtd_partitions(mymtds[i]);
 151                 else
 152                         del_mtd_device(mymtds[i]);
 153
 154                 map_destroy(mymtds[i]);
 155                 iounmap((void *)lubbock_maps[i].virt);
 156                 if (lubbock_maps[i].cached)
 157                         iounmap(lubbock_maps[i].cached);
 158
 159                 kfree(parsed_parts[i]);
 160         }
 161 }
 162
 163 module_init(init_lubbock);
 164 module_exit(cleanup_lubbock);
 165
 166 MODULE_LICENSE("GPL");
 167 MODULE_AUTHOR("Nicolas Pitre <nico@cam.org>");
 168 MODULE_DESCRIPTION("MTD map driver for Intel Lubbock");