drivers/mtd/maps/solutionengine.c

   1 /*
   2  * Flash and EPROM on Hitachi Solution Engine and similar boards.
   3  *
   4  * (C) 2001 Red Hat, Inc.
   5  *
   6  * GPL'd
   7  */
   8
   9 #include <linux/module.h>
  10 #include <linux/types.h>
  11 #include <linux/kernel.h>
  12 #include <linux/init.h>
  13 #include <asm/io.h>
  14 #include <linux/mtd/mtd.h>
  15 #include <linux/mtd/map.h>
  16 #include <linux/mtd/partitions.h>
  17 #include <linux/errno.h>
  18
  19 static struct mtd_info *flash_mtd;
  20 static struct mtd_info *eprom_mtd;
  21
  22 struct map_info soleng_eprom_map = {
  23         .name = "Solution Engine EPROM",
  24         .size = 0x400000,
  25         .bankwidth = 4,
  26 };
  27
  28 struct map_info soleng_flash_map = {
  29         .name = "Solution Engine FLASH",
  30         .size = 0x400000,
  31         .bankwidth = 4,
  32 };
  33
  34 static const char * const probes[] = { "RedBoot", "cmdlinepart", NULL };
  35
  36 static int __init init_soleng_maps(void)
  37 {
  38         /* First probe at offset 0 */
  39         soleng_flash_map.phys = 0;
  40         soleng_flash_map.virt = (void __iomem *)P2SEGADDR(0);
  41         soleng_eprom_map.phys = 0x01000000;
  42         soleng_eprom_map.virt = (void __iomem *)P1SEGADDR(0x01000000);
  43         simple_map_init(&soleng_eprom_map);
  44         simple_map_init(&soleng_flash_map);
  45
  46         printk(KERN_NOTICE "Probing for flash chips at 0x00000000:\n");
  47         flash_mtd = do_map_probe("cfi_probe", &soleng_flash_map);
  48         if (!flash_mtd) {
  49                 /* Not there. Try swapping */
  50                 printk(KERN_NOTICE "Probing for flash chips at 0x01000000:\n");
  51                 soleng_flash_map.phys = 0x01000000;
  52                 soleng_flash_map.virt = P2SEGADDR(0x01000000);
  53                 soleng_eprom_map.phys = 0;
  54                 soleng_eprom_map.virt = P1SEGADDR(0);
  55                 flash_mtd = do_map_probe("cfi_probe", &soleng_flash_map);
  56                 if (!flash_mtd) {
  57                         /* Eep. */
  58                         printk(KERN_NOTICE "Flash chips not detected at either possible location.\n");
  59                         return -ENXIO;
  60                 }
  61         }
  62         printk(KERN_NOTICE "Solution Engine: Flash at 0x%08lx, EPROM at 0x%08lx\n",
  63                soleng_flash_map.phys & 0x1fffffff,
  64                soleng_eprom_map.phys & 0x1fffffff);
  65         flash_mtd->owner = THIS_MODULE;
  66
  67         eprom_mtd = do_map_probe("map_rom", &soleng_eprom_map);
  68         if (eprom_mtd) {
  69                 eprom_mtd->owner = THIS_MODULE;
  70                 mtd_device_register(eprom_mtd, NULL, 0);
  71         }
  72
  73         mtd_device_parse_register(flash_mtd, probes, NULL, NULL, 0);
  74
  75         return 0;
  76 }
  77
  78 static void __exit cleanup_soleng_maps(void)
  79 {
  80         if (eprom_mtd) {
  81                 mtd_device_unregister(eprom_mtd);
  82                 map_destroy(eprom_mtd);
  83         }
  84
  85         mtd_device_unregister(flash_mtd);
  86         map_destroy(flash_mtd);
  87 }
  88
  89 module_init(init_soleng_maps);
  90 module_exit(cleanup_soleng_maps);
  91
  92 MODULE_LICENSE("GPL");
  93 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
  94 MODULE_DESCRIPTION("MTD map driver for Hitachi SolutionEngine (and similar) boards");
  95