drivers/mtd/maps/solutionengine.c

   1 /*
   2  * $Id: solutionengine.c,v 1.14 2004/09/16 23:27:14 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/config.h>
  20 #include <linux/errno.h>
  21
  22 static struct mtd_info *flash_mtd;
  23 static struct mtd_info *eprom_mtd;
  24
  25 static struct mtd_partition *parsed_parts;
  26
  27 struct map_info soleng_eprom_map = {
  28         .name = "Solution Engine EPROM",
  29         .size = 0x400000,
  30         .bankwidth = 4,
  31 };
  32
  33 struct map_info soleng_flash_map = {
  34         .name = "Solution Engine FLASH",
  35         .size = 0x400000,
  36         .bankwidth = 4,
  37 };
  38
  39 static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
  40
  41 #ifdef CONFIG_MTD_SUPERH_RESERVE
  42 static struct mtd_partition superh_se_partitions[] = {
  43         /* Reserved for boot code, read-only */
  44         {
  45                 .name = "flash_boot",
  46                 .offset = 0x00000000,
  47                 .size = CONFIG_MTD_SUPERH_RESERVE,
  48                 .mask_flags = MTD_WRITEABLE,
  49         },
  50         /* All else is writable (e.g. JFFS) */
  51         {
  52                 .name = "Flash FS",
  53                 .offset = MTDPART_OFS_NXTBLK,
  54                 .size = MTDPART_SIZ_FULL,
  55         }
  56 };
  57 #endif /* CONFIG_MTD_SUPERH_RESERVE */
  58
  59 static int __init init_soleng_maps(void)
  60 {
  61         int nr_parts = 0;
  62
  63         /* First probe at offset 0 */
  64         soleng_flash_map.phys = 0;
  65         soleng_flash_map.virt = (void __iomem *)P2SEGADDR(0);
  66         soleng_eprom_map.phys = 0x01000000;
  67         soleng_eprom_map.virt = (void __iomem *)P1SEGADDR(0x01000000);
  68         simple_map_init(&soleng_eprom_map);
  69         simple_map_init(&soleng_flash_map);
  70
  71         printk(KERN_NOTICE "Probing for flash chips at 0x00000000:\n");
  72         flash_mtd = do_map_probe("cfi_probe", &soleng_flash_map);
  73         if (!flash_mtd) {
  74                 /* Not there. Try swapping */
  75                 printk(KERN_NOTICE "Probing for flash chips at 0x01000000:\n");
  76                 soleng_flash_map.phys = 0x01000000;
  77                 soleng_flash_map.virt = P2SEGADDR(0x01000000);
  78                 soleng_eprom_map.phys = 0;
  79                 soleng_eprom_map.virt = P1SEGADDR(0);
  80                 flash_mtd = do_map_probe("cfi_probe", &soleng_flash_map);
  81                 if (!flash_mtd) {
  82                         /* Eep. */
  83                         printk(KERN_NOTICE "Flash chips not detected at either possible location.\n");
  84                         return -ENXIO;
  85                 }
  86         }
  87         printk(KERN_NOTICE "Solution Engine: Flash at 0x%08lx, EPROM at 0x%08lx\n",
  88                soleng_flash_map.phys & 0x1fffffff,
  89                soleng_eprom_map.phys & 0x1fffffff);
  90         flash_mtd->owner = THIS_MODULE;
  91
  92         eprom_mtd = do_map_probe("map_rom", &soleng_eprom_map);
  93         if (eprom_mtd) {
  94                 eprom_mtd->owner = THIS_MODULE;
  95                 add_mtd_device(eprom_mtd);
  96         }
  97
  98         nr_parts = parse_mtd_partitions(flash_mtd, probes, &parsed_parts, 0);
  99
 100 #ifdef CONFIG_MTD_SUPERH_RESERVE
 101         if (nr_parts <= 0) {
 102                 printk(KERN_NOTICE "Using configured partition at 0x%08x.\n",
 103                        CONFIG_MTD_SUPERH_RESERVE);
 104                 parsed_parts = superh_se_partitions;
 105                 nr_parts = sizeof(superh_se_partitions)/sizeof(*parsed_parts);
 106         }
 107 #endif /* CONFIG_MTD_SUPERH_RESERVE */
 108
 109         if (nr_parts > 0)
 110                 add_mtd_partitions(flash_mtd, parsed_parts, nr_parts);
 111         else
 112                 add_mtd_device(flash_mtd);
 113
 114         return 0;
 115 }
 116
 117 static void __exit cleanup_soleng_maps(void)
 118 {
 119         if (eprom_mtd) {
 120                 del_mtd_device(eprom_mtd);
 121                 map_destroy(eprom_mtd);
 122         }
 123
 124         if (parsed_parts)
 125                 del_mtd_partitions(flash_mtd);
 126         else
 127                 del_mtd_device(flash_mtd);
 128         map_destroy(flash_mtd);
 129 }
 130
 131 module_init(init_soleng_maps);
 132 module_exit(cleanup_soleng_maps);
 133
 134 MODULE_LICENSE("GPL");
 135 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 136 MODULE_DESCRIPTION("MTD map driver for Hitachi SolutionEngine (and similar) boards");
 137