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
  22static struct mtd_partition *parsed_parts;
  23
  24struct map_info soleng_eprom_map = {
  25        .name = "Solution Engine EPROM",
  26        .size = 0x400000,
  27        .bankwidth = 4,
  28};
  29
  30struct map_info soleng_flash_map = {
  31        .name = "Solution Engine FLASH",
  32        .size = 0x400000,
  33        .bankwidth = 4,
  34};
  35
  36static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
  37
  38#ifdef CONFIG_MTD_SUPERH_RESERVE
  39static struct mtd_partition superh_se_partitions[] = {
  40        /* Reserved for boot code, read-only */
  41        {
  42                .name = "flash_boot",
  43                .offset = 0x00000000,
  44                .size = CONFIG_MTD_SUPERH_RESERVE,
  45                .mask_flags = MTD_WRITEABLE,
  46        },
  47        /* All else is writable (e.g. JFFS) */
  48        {
  49                .name = "Flash FS",
  50                .offset = MTDPART_OFS_NXTBLK,
  51                .size = MTDPART_SIZ_FULL,
  52        }
  53};
  54#endif /* CONFIG_MTD_SUPERH_RESERVE */
  55
  56static int __init init_soleng_maps(void)
  57{
  58        int nr_parts = 0;
  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        nr_parts = parse_mtd_partitions(flash_mtd, probes, &parsed_parts, 0);
  96
  97#ifdef CONFIG_MTD_SUPERH_RESERVE
  98        if (nr_parts <= 0) {
  99                printk(KERN_NOTICE "Using configured partition at 0x%08x.\n",
 100                       CONFIG_MTD_SUPERH_RESERVE);
 101                parsed_parts = superh_se_partitions;
 102                nr_parts = sizeof(superh_se_partitions)/sizeof(*parsed_parts);
 103        }
 104#endif /* CONFIG_MTD_SUPERH_RESERVE */
 105
 106        if (nr_parts > 0)
 107                mtd_device_register(flash_mtd, parsed_parts, nr_parts);
 108        else
 109                mtd_device_register(flash_mtd, NULL, 0);
 110
 111        return 0;
 112}
 113
 114static void __exit cleanup_soleng_maps(void)
 115{
 116        if (eprom_mtd) {
 117                mtd_device_unregister(eprom_mtd);
 118                map_destroy(eprom_mtd);
 119        }
 120
 121        if (parsed_parts)
 122                mtd_device_unregister(flash_mtd);
 123        else
 124                mtd_device_unregister(flash_mtd);
 125        map_destroy(flash_mtd);
 126}
 127
 128module_init(init_soleng_maps);
 129module_exit(cleanup_soleng_maps);
 130
 131MODULE_LICENSE("GPL");
 132MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 133MODULE_DESCRIPTION("MTD map driver for Hitachi SolutionEngine (and similar) boards");
 134
 135