drivers/mtd/maps/h720x-flash.c

   1 /*
   2  * Flash memory access on Hynix GMS30C7201/HMS30C7202 based
   3  * evaluation boards
   4  *
   5  * $Id: h720x-flash.c,v 1.12 2005/11/07 11:14:27 gleixner Exp $
   6  *
   7  * (C) 2002 Jungjun Kim <jungjun.kim@hynix.com>
   8  *     2003 Thomas Gleixner <tglx@linutronix.de>
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/types.h>
  13 #include <linux/kernel.h>
  14 #include <linux/init.h>
  15 #include <linux/errno.h>
  16 #include <linux/slab.h>
  17
  18 #include <linux/mtd/mtd.h>
  19 #include <linux/mtd/map.h>
  20 #include <linux/mtd/partitions.h>
  21 #include <asm/hardware.h>
  22 #include <asm/io.h>
  23
  24 static struct mtd_info *mymtd;
  25
  26 static struct map_info h720x_map = {
  27         .name =         "H720X",
  28         .bankwidth =    4,
  29         .size =         FLASH_SIZE,
  30         .phys =         FLASH_PHYS,
  31 };
  32
  33 static struct mtd_partition h720x_partitions[] = {
  34         {
  35                 .name = "ArMon",
  36                 .size = 0x00080000,
  37                 .offset = 0,
  38                 .mask_flags = MTD_WRITEABLE
  39         },{
  40                 .name = "Env",
  41                 .size = 0x00040000,
  42                 .offset = 0x00080000,
  43                 .mask_flags = MTD_WRITEABLE
  44         },{
  45                 .name = "Kernel",
  46                 .size = 0x00180000,
  47                 .offset = 0x000c0000,
  48                 .mask_flags = MTD_WRITEABLE
  49         },{
  50                 .name = "Ramdisk",
  51                 .size = 0x00400000,
  52                 .offset = 0x00240000,
  53                 .mask_flags = MTD_WRITEABLE
  54         },{
  55                 .name = "jffs2",
  56                 .size = MTDPART_SIZ_FULL,
  57                 .offset = MTDPART_OFS_APPEND
  58         }
  59 };
  60
  61 #define NUM_PARTITIONS ARRAY_SIZE(h720x_partitions)
  62
  63 static int                   nr_mtd_parts;
  64 static struct mtd_partition *mtd_parts;
  65 static const char *probes[] = { "cmdlinepart", NULL };
  66
  67 /*
  68  * Initialize FLASH support
  69  */
  70 int __init h720x_mtd_init(void)
  71 {
  72
  73         char    *part_type = NULL;
  74
  75         h720x_map.virt = ioremap(FLASH_PHYS, FLASH_SIZE);
  76
  77         if (!h720x_map.virt) {
  78                 printk(KERN_ERR "H720x-MTD: ioremap failed\n");
  79                 return -EIO;
  80         }
  81
  82         simple_map_init(&h720x_map);
  83
  84         // Probe for flash bankwidth 4
  85         printk (KERN_INFO "H720x-MTD probing 32bit FLASH\n");
  86         mymtd = do_map_probe("cfi_probe", &h720x_map);
  87         if (!mymtd) {
  88                 printk (KERN_INFO "H720x-MTD probing 16bit FLASH\n");
  89             // Probe for bankwidth 2
  90             h720x_map.bankwidth = 2;
  91             mymtd = do_map_probe("cfi_probe", &h720x_map);
  92         }
  93
  94         if (mymtd) {
  95                 mymtd->owner = THIS_MODULE;
  96
  97 #ifdef CONFIG_MTD_PARTITIONS
  98                 nr_mtd_parts = parse_mtd_partitions(mymtd, probes, &mtd_parts, 0);
  99                 if (nr_mtd_parts > 0)
 100                         part_type = "command line";
 101 #endif
 102                 if (nr_mtd_parts <= 0) {
 103                         mtd_parts = h720x_partitions;
 104                         nr_mtd_parts = NUM_PARTITIONS;
 105                         part_type = "builtin";
 106                 }
 107                 printk(KERN_INFO "Using %s partition table\n", part_type);
 108                 add_mtd_partitions(mymtd, mtd_parts, nr_mtd_parts);
 109                 return 0;
 110         }
 111
 112         iounmap((void *)h720x_map.virt);
 113         return -ENXIO;
 114 }
 115
 116 /*
 117  * Cleanup
 118  */
 119 static void __exit h720x_mtd_cleanup(void)
 120 {
 121
 122         if (mymtd) {
 123                 del_mtd_partitions(mymtd);
 124                 map_destroy(mymtd);
 125         }
 126
 127         /* Free partition info, if commandline partition was used */
 128         if (mtd_parts && (mtd_parts != h720x_partitions))
 129                 kfree (mtd_parts);
 130
 131         if (h720x_map.virt) {
 132                 iounmap((void *)h720x_map.virt);
 133                 h720x_map.virt = 0;
 134         }
 135 }
 136
 137
 138 module_init(h720x_mtd_init);
 139 module_exit(h720x_mtd_cleanup);
 140
 141 MODULE_LICENSE("GPL");
 142 MODULE_AUTHOR("Thomas Gleixner <tglx@linutronix.de>");
 143 MODULE_DESCRIPTION("MTD map driver for Hynix evaluation boards");