drivers/mtd/maps/solutionengine.c

   1 /*
   2  * $Id: solutionengine.c,v 1.15 2005/11/07 11:14:28 gleixner Exp $
   3  *
   4  * Flash and EPROM on Hitachi Solution Engine and similar boards.
   5  *
   6  * (C) 2001 Red Hat, Inc.
   7  *
   8  * GPL'd
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/types.h>
  13 #include <linux/kernel.h>
  14 #include <linux/init.h>
  15 #include <asm/io.h>
  16 #include <linux/mtd/mtd.h>
  17 #include <linux/mtd/map.h>
  18 #include <linux/mtd/partitions.h>
  19 #include <linux/errno.h>
  20
  21 static struct mtd_info *flash_mtd;
  22 static struct mtd_info *eprom_mtd;
  23
  24 static struct mtd_partition *parsed_parts;
  25
  26 struct map_info soleng_eprom_map = {
  27         .name = "Solution Engine EPROM",
  28         .size = 0x400000,
  29         .bankwidth = 4,
  30 };
  31
  32 struct map_info soleng_flash_map = {
  33         .name = "Solution Engine FLASH",
  34         .size = 0x400000,
  35         .bankwidth = 4,
  36 };
  37
  38 static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
  39
  40 #ifdef CONFIG_MTD_SUPERH_RESERVE
  41 static struct mtd_partition superh_se_partitions[] = {
  42         /* Reserved for boot code, read-only */
  43         {
  44                 .name = "flash_boot",
  45                 .offset = 0x00000000,
  46                 .size = CONFIG_MTD_SUPERH_RESERVE,
  47                 .mask_flags = MTD_WRITEABLE,
  48         },
  49         /* All else is writable (e.g. JFFS) */
  50         {
  51                 .name = "Flash FS",
  52                 .offset = MTDPART_OFS_NXTBLK,
  53                 .size = MTDPART_SIZ_FULL,
  54         }
  55 };
  56 #endif /* CONFIG_MTD_SUPERH_RESERVE */
  57
  58 static int __init init_soleng_maps(void)
  59 {
  60         int nr_parts = 0;
  61
  62         /* First probe at offset 0 */
  63         soleng_flash_map.phys = 0;
  64         soleng_flash_map.virt = (void __iomem *)P2SEGADDR(0);
  65         soleng_eprom_map.phys = 0x01000000;
  66         soleng_eprom_map.virt = (void __iomem *)P1SEGADDR(0x01000000);
  67         simple_map_init(&soleng_eprom_map);
  68         simple_map_init(&soleng_flash_map);
  69
  70         printk(KERN_NOTICE "Probing for flash chips at 0x00000000:\n");
  71         flash_mtd = do_map_probe("cfi_probe", &soleng_flash_map);
  72         if (!flash_mtd) {
  73                 /* Not there. Try swapping */
  74                 printk(KERN_NOTICE "Probing for flash chips at 0x01000000:\n");
  75                 soleng_flash_map.phys = 0x01000000;
  76                 soleng_flash_map.virt = P2SEGADDR(0x01000000);
  77                 soleng_eprom_map.phys = 0;
  78                 soleng_eprom_map.virt = P1SEGADDR(0);
  79                 flash_mtd = do_map_probe("cfi_probe", &soleng_flash_map);
  80                 if (!flash_mtd) {
  81                         /* Eep. */
  82                         printk(KERN_NOTICE "Flash chips not detected at either possible location.\n");
  83                         return -ENXIO;
  84                 }
  85         }
  86         printk(KERN_NOTICE "Solution Engine: Flash at 0x%08lx, EPROM at 0x%08lx\n",
  87                soleng_flash_map.phys & 0x1fffffff,
  88                soleng_eprom_map.phys & 0x1fffffff);
  89         flash_mtd->owner = THIS_MODULE;
  90
  91         eprom_mtd = do_map_probe("map_rom", &soleng_eprom_map);
  92         if (eprom_mtd) {
  93                 eprom_mtd->owner = THIS_MODULE;
  94                 add_mtd_device(eprom_mtd);
  95         }
  96
  97         nr_parts = parse_mtd_partitions(flash_mtd, probes, &parsed_parts, 0);
  98
  99 #ifdef CONFIG_MTD_SUPERH_RESERVE
 100         if (nr_parts <= 0) {
 101                 printk(KERN_NOTICE "Using configured partition at 0x%08x.\n",
 102                        CONFIG_MTD_SUPERH_RESERVE);
 103                 parsed_parts = superh_se_partitions;
 104                 nr_parts = sizeof(superh_se_partitions)/sizeof(*parsed_parts);
 105         }
 106 #endif /* CONFIG_MTD_SUPERH_RESERVE */
 107
 108         if (nr_parts > 0)
 109                 add_mtd_partitions(flash_mtd, parsed_parts, nr_parts);
 110         else
 111                 add_mtd_device(flash_mtd);
 112
 113         return 0;
 114 }
 115
 116 static void __exit cleanup_soleng_maps(void)
 117 {
 118         if (eprom_mtd) {
 119                 del_mtd_device(eprom_mtd);
 120                 map_destroy(eprom_mtd);
 121         }
 122
 123         if (parsed_parts)
 124                 del_mtd_partitions(flash_mtd);
 125         else
 126                 del_mtd_device(flash_mtd);
 127         map_destroy(flash_mtd);
 128 }
 129
 130 module_init(init_soleng_maps);
 131 module_exit(cleanup_soleng_maps);
 132
 133 MODULE_LICENSE("GPL");
 134 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 135 MODULE_DESCRIPTION("MTD map driver for Hitachi SolutionEngine (and similar) boards");
 136