drivers/mtd/maps/mainstone-flash.c

   1 /*
   2  * $Id:  $
   3  *
   4  * Map driver for the Mainstone 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/dma-mapping.h>
  19 #include <linux/mtd/mtd.h>
  20 #include <linux/mtd/map.h>
  21 #include <linux/mtd/partitions.h>
  22 #include <asm/io.h>
  23 #include <asm/hardware.h>
  24 #include <asm/arch/pxa-regs.h>
  25 #include <asm/arch/mainstone.h>
  26
  27
  28 #define ROM_ADDR        0x00000000
  29 #define FLASH_ADDR      0x04000000
  30
  31 #define WINDOW_SIZE     0x04000000
  32
  33 static void mainstone_map_inval_cache(struct map_info *map, unsigned long from,
  34                                       ssize_t len)
  35 {
  36         consistent_sync((char *)map->cached + from, len, DMA_FROM_DEVICE);
  37 }
  38
  39 static struct map_info mainstone_maps[2] = { {
  40         .size =         WINDOW_SIZE,
  41         .phys =         PXA_CS0_PHYS,
  42         .inval_cache =  mainstone_map_inval_cache,
  43 }, {
  44         .size =         WINDOW_SIZE,
  45         .phys =         PXA_CS1_PHYS,
  46         .inval_cache =  mainstone_map_inval_cache,
  47 } };
  48
  49 static struct mtd_partition mainstone_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 =         0x00400000,
  58                 .offset =       0x00040000,
  59         },{
  60                 .name =         "Filesystem",
  61                 .size =         MTDPART_SIZ_FULL,
  62                 .offset =       0x00440000
  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_mainstone(void)
  73 {
  74         int SW7 = 0;  /* FIXME: get from SCR (Mst doc section 3.2.1.1) */
  75         int ret = 0, i;
  76
  77         mainstone_maps[0].bankwidth = (BOOT_DEF & 1) ? 2 : 4;
  78         mainstone_maps[1].bankwidth = 4;
  79
  80         /* Compensate for SW7 which swaps the flash banks */
  81         mainstone_maps[SW7].name = "processor flash";
  82         mainstone_maps[SW7 ^ 1].name = "main board flash";
  83
  84         printk(KERN_NOTICE "Mainstone configured to boot from %s\n",
  85                mainstone_maps[0].name);
  86
  87         for (i = 0; i < 2; i++) {
  88                 mainstone_maps[i].virt = ioremap(mainstone_maps[i].phys,
  89                                                  WINDOW_SIZE);
  90                 if (!mainstone_maps[i].virt) {
  91                         printk(KERN_WARNING "Failed to ioremap %s\n",
  92                                mainstone_maps[i].name);
  93                         if (!ret)
  94                                 ret = -ENOMEM;
  95                         continue;
  96                 }
  97                 mainstone_maps[i].cached =
  98                         ioremap_cached(mainstone_maps[i].phys, WINDOW_SIZE);
  99                 if (!mainstone_maps[i].cached)
 100                         printk(KERN_WARNING "Failed to ioremap cached %s\n",
 101                                mainstone_maps[i].name);
 102                 simple_map_init(&mainstone_maps[i]);
 103
 104                 printk(KERN_NOTICE
 105                        "Probing %s at physical address 0x%08lx"
 106                        " (%d-bit bankwidth)\n",
 107                        mainstone_maps[i].name, mainstone_maps[i].phys,
 108                        mainstone_maps[i].bankwidth * 8);
 109
 110                 mymtds[i] = do_map_probe("cfi_probe", &mainstone_maps[i]);
 111
 112                 if (!mymtds[i]) {
 113                         iounmap((void *)mainstone_maps[i].virt);
 114                         if (mainstone_maps[i].cached)
 115                                 iounmap(mainstone_maps[i].cached);
 116                         if (!ret)
 117                                 ret = -EIO;
 118                         continue;
 119                 }
 120                 mymtds[i]->owner = THIS_MODULE;
 121
 122                 ret = parse_mtd_partitions(mymtds[i], probes,
 123                                            &parsed_parts[i], 0);
 124
 125                 if (ret > 0)
 126                         nr_parsed_parts[i] = ret;
 127         }
 128
 129         if (!mymtds[0] && !mymtds[1])
 130                 return ret;
 131
 132         for (i = 0; i < 2; i++) {
 133                 if (!mymtds[i]) {
 134                         printk(KERN_WARNING "%s is absent. Skipping\n",
 135                                mainstone_maps[i].name);
 136                 } else if (nr_parsed_parts[i]) {
 137                         add_mtd_partitions(mymtds[i], parsed_parts[i],
 138                                            nr_parsed_parts[i]);
 139                 } else if (!i) {
 140                         printk("Using static partitions on %s\n",
 141                                mainstone_maps[i].name);
 142                         add_mtd_partitions(mymtds[i], mainstone_partitions,
 143                                            ARRAY_SIZE(mainstone_partitions));
 144                 } else {
 145                         printk("Registering %s as whole device\n",
 146                                mainstone_maps[i].name);
 147                         add_mtd_device(mymtds[i]);
 148                 }
 149         }
 150         return 0;
 151 }
 152
 153 static void __exit cleanup_mainstone(void)
 154 {
 155         int i;
 156         for (i = 0; i < 2; i++) {
 157                 if (!mymtds[i])
 158                         continue;
 159
 160                 if (nr_parsed_parts[i] || !i)
 161                         del_mtd_partitions(mymtds[i]);
 162                 else
 163                         del_mtd_device(mymtds[i]);
 164
 165                 map_destroy(mymtds[i]);
 166                 iounmap((void *)mainstone_maps[i].virt);
 167                 if (mainstone_maps[i].cached)
 168                         iounmap(mainstone_maps[i].cached);
 169                 kfree(parsed_parts[i]);
 170         }
 171 }
 172
 173 module_init(init_mainstone);
 174 module_exit(cleanup_mainstone);
 175
 176 MODULE_LICENSE("GPL");
 177 MODULE_AUTHOR("Nicolas Pitre <nico@cam.org>");
 178 MODULE_DESCRIPTION("MTD map driver for Intel Mainstone");