drivers/mtd/maps/lubbock-flash.c

   1 /*
   2  * $Id: lubbock-flash.c,v 1.15 2004/07/12 21:59:44 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 void lubbock_map_inval_cache(struct map_info *map, unsigned long from, ssize_t len)
  32 {
  33         consistent_sync((char *)map->cached + from, len, DMA_FROM_DEVICE);
  34 }
  35
  36 static struct map_info lubbock_maps[2] = { {
  37         .size =         WINDOW_SIZE,
  38         .phys =         0x00000000,
  39         .inval_cache =  lubbock_map_inval_cache,
  40 }, {
  41         .size =         WINDOW_SIZE,
  42         .phys =         0x04000000,
  43         .inval_cache =  lubbock_map_inval_cache,
  44 } };
  45
  46 static struct mtd_partition lubbock_partitions[] = {
  47         {
  48                 .name =         "Bootloader",
  49                 .size =         0x00040000,
  50                 .offset =       0,
  51                 .mask_flags =   MTD_WRITEABLE  /* force read-only */
  52         },{
  53                 .name =         "Kernel",
  54                 .size =         0x00100000,
  55                 .offset =       0x00040000,
  56         },{
  57                 .name =         "Filesystem",
  58                 .size =         MTDPART_SIZ_FULL,
  59                 .offset =       0x00140000
  60         }
  61 };
  62
  63 static struct mtd_info *mymtds[2];
  64 static struct mtd_partition *parsed_parts[2];
  65 static int nr_parsed_parts[2];
  66
  67 static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
  68
  69 static int __init init_lubbock(void)
  70 {
  71         int flashboot = (LUB_CONF_SWITCHES & 1);
  72         int ret = 0, i;
  73
  74         lubbock_maps[0].bankwidth = lubbock_maps[1].bankwidth =
  75                 (BOOT_DEF & 1) ? 2 : 4;
  76
  77         /* Compensate for the nROMBT switch which swaps the flash banks */
  78         printk(KERN_NOTICE "Lubbock configured to boot from %s (bank %d)\n",
  79                flashboot?"Flash":"ROM", flashboot);
  80
  81         lubbock_maps[flashboot^1].name = "Lubbock Application Flash";
  82         lubbock_maps[flashboot].name = "Lubbock Boot ROM";
  83
  84         for (i = 0; i < 2; i++) {
  85                 lubbock_maps[i].virt = (unsigned long)ioremap(lubbock_maps[i].phys, WINDOW_SIZE);
  86                 if (!lubbock_maps[i].virt) {
  87                         printk(KERN_WARNING "Failed to ioremap %s\n", lubbock_maps[i].name);
  88                         if (!ret)
  89                                 ret = -ENOMEM;
  90                         continue;
  91                 }
  92                 lubbock_maps[i].cached = __ioremap(lubbock_maps[i].phys,
  93                                                    WINDOW_SIZE,
  94                                                    L_PTE_CACHEABLE, 1);
  95                 if (!lubbock_maps[i].cached)
  96                         printk(KERN_WARNING "Failed to ioremap cached %s\n", lubbock_maps[i].name);
  97                 simple_map_init(&lubbock_maps[i]);
  98
  99                 printk(KERN_NOTICE "Probing %s at physical address 0x%08lx (%d-bit bankwidth)\n",
 100                        lubbock_maps[i].name, lubbock_maps[i].phys,
 101                        lubbock_maps[i].bankwidth * 8);
 102
 103                 mymtds[i] = do_map_probe("cfi_probe", &lubbock_maps[i]);
 104
 105                 if (!mymtds[i]) {
 106                         iounmap((void *)lubbock_maps[i].virt);
 107                         if (lubbock_maps[i].cached)
 108                                 iounmap(lubbock_maps[i].cached);
 109                         if (!ret)
 110                                 ret = -EIO;
 111                         continue;
 112                 }
 113                 mymtds[i]->owner = THIS_MODULE;
 114
 115                 ret = parse_mtd_partitions(mymtds[i], probes,
 116                                            &parsed_parts[i], 0);
 117
 118                 if (ret > 0)
 119                         nr_parsed_parts[i] = ret;
 120         }
 121
 122         if (!mymtds[0] && !mymtds[1])
 123                 return ret;
 124
 125         for (i = 0; i < 2; i++) {
 126                 if (!mymtds[i]) {
 127                         printk(KERN_WARNING "%s is absent. Skipping\n", lubbock_maps[i].name);
 128                 } else if (nr_parsed_parts[i]) {
 129                         add_mtd_partitions(mymtds[i], parsed_parts[i], nr_parsed_parts[i]);
 130                 } else if (!i) {
 131                         printk("Using static partitions on %s\n", lubbock_maps[i].name);
 132                         add_mtd_partitions(mymtds[i], lubbock_partitions, ARRAY_SIZE(lubbock_partitions));
 133                 } else {
 134                         printk("Registering %s as whole device\n", lubbock_maps[i].name);
 135                         add_mtd_device(mymtds[i]);
 136                 }
 137         }
 138         return 0;
 139 }
 140
 141 static void __exit cleanup_lubbock(void)
 142 {
 143         int i;
 144         for (i = 0; i < 2; i++) {
 145                 if (!mymtds[i])
 146                         continue;
 147
 148                 if (nr_parsed_parts[i] || !i)
 149                         del_mtd_partitions(mymtds[i]);
 150                 else
 151                         del_mtd_device(mymtds[i]);
 152
 153                 map_destroy(mymtds[i]);
 154                 iounmap((void *)lubbock_maps[i].virt);
 155                 if (lubbock_maps[i].cached)
 156                         iounmap(lubbock_maps[i].cached);
 157
 158                 if (parsed_parts[i])
 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");