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 *probes[] = { "RedBoot", "cmdlinepart", NULL };
  35
  36#ifdef CONFIG_MTD_SUPERH_RESERVE
  37static struct mtd_partition superh_se_partitions[] = {
  38        /* Reserved for boot code, read-only */
  39        {
  40                .name = "flash_boot",
  41                .offset = 0x00000000,
  42                .size = CONFIG_MTD_SUPERH_RESERVE,
  43                .mask_flags = MTD_WRITEABLE,
  44        },
  45        /* All else is writable (e.g. JFFS) */
  46        {
  47                .name = "Flash FS",
  48                .offset = MTDPART_OFS_NXTBLK,
  49                .size = MTDPART_SIZ_FULL,
  50        }
  51};
  52#define NUM_PARTITIONS ARRAY_SIZE(superh_se_partitions)
  53#else
  54#define superh_se_partitions NULL
  55#define NUM_PARTITIONS 0
  56#endif /* CONFIG_MTD_SUPERH_RESERVE */
  57
  58static int __init init_soleng_maps(void)
  59{
  60        /* First probe at offset 0 */
  61        soleng_flash_map.phys = 0;
  62        soleng_flash_map.virt = (void __iomem *)P2SEGADDR(0);
  63        soleng_eprom_map.phys = 0x01000000;
  64        soleng_eprom_map.virt = (void __iomem *)P1SEGADDR(0x01000000);
  65        simple_map_init(&soleng_eprom_map);
  66        simple_map_init(&soleng_flash_map);
  67
  68        printk(KERN_NOTICE "Probing for flash chips at 0x00000000:\n");
  69        flash_mtd = do_map_probe("cfi_probe", &soleng_flash_map);
  70        if (!flash_mtd) {
  71                /* Not there. Try swapping */
  72                printk(KERN_NOTICE "Probing for flash chips at 0x01000000:\n");
  73                soleng_flash_map.phys = 0x01000000;
  74                soleng_flash_map.virt = P2SEGADDR(0x01000000);
  75                soleng_eprom_map.phys = 0;
  76                soleng_eprom_map.virt = P1SEGADDR(0);
  77                flash_mtd = do_map_probe("cfi_probe", &soleng_flash_map);
  78                if (!flash_mtd) {
  79                        /* Eep. */
  80                        printk(KERN_NOTICE "Flash chips not detected at either possible location.\n");
  81                        return -ENXIO;
  82                }
  83        }
  84        printk(KERN_NOTICE "Solution Engine: Flash at 0x%08lx, EPROM at 0x%08lx\n",
  85               soleng_flash_map.phys & 0x1fffffff,
  86               soleng_eprom_map.phys & 0x1fffffff);
  87        flash_mtd->owner = THIS_MODULE;
  88
  89        eprom_mtd = do_map_probe("map_rom", &soleng_eprom_map);
  90        if (eprom_mtd) {
  91                eprom_mtd->owner = THIS_MODULE;
  92                mtd_device_register(eprom_mtd, NULL, 0);
  93        }
  94
  95        mtd_device_parse_register(flash_mtd, probes, 0,
  96                        superh_se_partitions, NUM_PARTITIONS);
  97
  98        return 0;
  99}
 100
 101static void __exit cleanup_soleng_maps(void)
 102{
 103        if (eprom_mtd) {
 104                mtd_device_unregister(eprom_mtd);
 105                map_destroy(eprom_mtd);
 106        }
 107
 108        mtd_device_unregister(flash_mtd);
 109        map_destroy(flash_mtd);
 110}
 111
 112module_init(init_soleng_maps);
 113module_exit(cleanup_soleng_maps);
 114
 115MODULE_LICENSE("GPL");
 116MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 117MODULE_DESCRIPTION("MTD map driver for Hitachi SolutionEngine (and similar) boards");
 118
 119