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