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 *probes[] = { "RedBoot", "cmdlinepart", NULL };
  35
  36 #ifdef CONFIG_MTD_SUPERH_RESERVE
  37 static 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
  58 static 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, NULL,
  96                                   superh_se_partitions, NUM_PARTITIONS);
  97
  98         return 0;
  99 }
 100
 101 static 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
 112 module_init(init_soleng_maps);
 113 module_exit(cleanup_soleng_maps);
 114
 115 MODULE_LICENSE("GPL");
 116 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 117 MODULE_DESCRIPTION("MTD map driver for Hitachi SolutionEngine (and similar) boards");
 118