LXR linux/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
  19static struct mtd_info *flash_mtd;
  20static struct mtd_info *eprom_mtd;
  21
  22struct map_info soleng_eprom_map = {
  23        .name = "Solution Engine EPROM",
  24        .size = 0x400000,
  25        .bankwidth = 4,
  26};
  27
  28struct map_info soleng_flash_map = {
  29        .name = "Solution Engine FLASH",
  30        .size = 0x400000,
  31        .bankwidth = 4,
  32};
  33
  34static const char * const probes[] = { "RedBoot", "cmdlinepart", NULL };
  35
  36static 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
  78static 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
  89module_init(init_soleng_maps);
  90module_exit(cleanup_soleng_maps);
  91
  92MODULE_LICENSE("GPL");
  93MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
  94MODULE_DESCRIPTION("MTD map driver for Hitachi SolutionEngine (and similar) boards");
  95
  96