drivers/mtd/maps/h720x-flash.c

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