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   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 static struct mtd_partition *parsed_parts;
  23
  24 struct map_info soleng_eprom_map = {
  25         .name = "Solution Engine EPROM",
  26         .size = 0x400000,
  27         .bankwidth = 4,
  28 };
  29
  30 struct map_info soleng_flash_map = {
  31         .name = "Solution Engine FLASH",
  32         .size = 0x400000,
  33         .bankwidth = 4,
  34 };
  35
  36 static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
  37
  38 #ifdef CONFIG_MTD_SUPERH_RESERVE
  39 static 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
  56 static 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                 add_mtd_device(eprom_mtd);
  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                 add_mtd_partitions(flash_mtd, parsed_parts, nr_parts);
 108         else
 109                 add_mtd_device(flash_mtd);
 110
 111         return 0;
 112 }
 113
 114 static void __exit cleanup_soleng_maps(void)
 115 {
 116         if (eprom_mtd) {
 117                 del_mtd_device(eprom_mtd);
 118                 map_destroy(eprom_mtd);
 119         }
 120
 121         if (parsed_parts)
 122                 del_mtd_partitions(flash_mtd);
 123         else
 124                 del_mtd_device(flash_mtd);
 125         map_destroy(flash_mtd);
 126 }
 127
 128 module_init(init_soleng_maps);
 129 module_exit(cleanup_soleng_maps);
 130
 131 MODULE_LICENSE("GPL");
 132 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 133 MODULE_DESCRIPTION("MTD map driver for Hitachi SolutionEngine (and similar) boards");
 134