drivers/mtd/maps/wr_sbc82xx_flash.c

   1 /*
   2  * $Id: wr_sbc82xx_flash.c,v 1.8 2005/11/07 11:14:29 gleixner Exp $
   3  *
   4  * Map for flash chips on Wind River PowerQUICC II SBC82xx board.
   5  *
   6  * Copyright (C) 2004 Red Hat, Inc.
   7  *
   8  * Author: David Woodhouse <dwmw2@infradead.org>
   9  *
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/types.h>
  14 #include <linux/kernel.h>
  15 #include <linux/init.h>
  16 #include <linux/slab.h>
  17 #include <asm/io.h>
  18 #include <linux/mtd/mtd.h>
  19 #include <linux/mtd/map.h>
  20 #include <linux/mtd/partitions.h>
  21
  22 #include <asm/immap_cpm2.h>
  23
  24 static struct mtd_info *sbcmtd[3];
  25 static struct mtd_partition *sbcmtd_parts[3];
  26
  27 struct map_info sbc82xx_flash_map[3] = {
  28         {.name = "Boot flash"},
  29         {.name = "Alternate boot flash"},
  30         {.name = "User flash"}
  31 };
  32
  33 static struct mtd_partition smallflash_parts[] = {
  34         {
  35                 .name =         "space",
  36                 .size =         0x100000,
  37                 .offset =       0,
  38         }, {
  39                 .name =         "bootloader",
  40                 .size =         MTDPART_SIZ_FULL,
  41                 .offset =       MTDPART_OFS_APPEND,
  42         }
  43 };
  44
  45 static struct mtd_partition bigflash_parts[] = {
  46         {
  47                 .name =         "bootloader",
  48                 .size =         0x00100000,
  49                 .offset =       0,
  50         }, {
  51                 .name =         "file system",
  52                 .size =         0x01f00000,
  53                 .offset =       MTDPART_OFS_APPEND,
  54         }, {
  55                 .name =         "boot config",
  56                 .size =         0x00100000,
  57                 .offset =       MTDPART_OFS_APPEND,
  58         }, {
  59                 .name =         "space",
  60                 .size =         0x01f00000,
  61                 .offset =       MTDPART_OFS_APPEND,
  62         }
  63 };
  64
  65 static const char *part_probes[] __initdata = {"cmdlinepart", "RedBoot", NULL};
  66
  67 #define init_sbc82xx_one_flash(map, br, or)                     \
  68 do {                                                            \
  69         (map).phys = (br & 1) ? (br & 0xffff8000) : 0;          \
  70         (map).size = (br & 1) ? (~(or & 0xffff8000) + 1) : 0;   \
  71         switch (br & 0x00001800) {                              \
  72         case 0x00000000:                                        \
  73         case 0x00000800:        (map).bankwidth = 1;    break;  \
  74         case 0x00001000:        (map).bankwidth = 2;    break;  \
  75         case 0x00001800:        (map).bankwidth = 4;    break;  \
  76         }                                                       \
  77 } while (0);
  78
  79 int __init init_sbc82xx_flash(void)
  80 {
  81         volatile memctl_cpm2_t *mc = &cpm2_immr->im_memctl;
  82         int bigflash;
  83         int i;
  84
  85 #ifdef CONFIG_SBC8560
  86         mc = ioremap(0xff700000 + 0x5000, sizeof(memctl_cpm2_t));
  87 #else
  88         mc = &cpm2_immr->im_memctl;
  89 #endif
  90
  91         bigflash = 1;
  92         if ((mc->memc_br0 & 0x00001800) == 0x00001800)
  93                 bigflash = 0;
  94
  95         init_sbc82xx_one_flash(sbc82xx_flash_map[0], mc->memc_br0, mc->memc_or0);
  96         init_sbc82xx_one_flash(sbc82xx_flash_map[1], mc->memc_br6, mc->memc_or6);
  97         init_sbc82xx_one_flash(sbc82xx_flash_map[2], mc->memc_br1, mc->memc_or1);
  98
  99 #ifdef CONFIG_SBC8560
 100         iounmap((void *) mc);
 101 #endif
 102
 103         for (i=0; i<3; i++) {
 104                 int8_t flashcs[3] = { 0, 6, 1 };
 105                 int nr_parts;
 106
 107                 printk(KERN_NOTICE "PowerQUICC II %s (%ld MiB on CS%d",
 108                        sbc82xx_flash_map[i].name,
 109                        (sbc82xx_flash_map[i].size >> 20),
 110                        flashcs[i]);
 111                 if (!sbc82xx_flash_map[i].phys) {
 112                         /* We know it can't be at zero. */
 113                         printk("): disabled by bootloader.\n");
 114                         continue;
 115                 }
 116                 printk(" at %08lx)\n",  sbc82xx_flash_map[i].phys);
 117
 118                 sbc82xx_flash_map[i].virt = ioremap(sbc82xx_flash_map[i].phys, sbc82xx_flash_map[i].size);
 119
 120                 if (!sbc82xx_flash_map[i].virt) {
 121                         printk("Failed to ioremap\n");
 122                         continue;
 123                 }
 124
 125                 simple_map_init(&sbc82xx_flash_map[i]);
 126
 127                 sbcmtd[i] = do_map_probe("cfi_probe", &sbc82xx_flash_map[i]);
 128
 129                 if (!sbcmtd[i])
 130                         continue;
 131
 132                 sbcmtd[i]->owner = THIS_MODULE;
 133
 134                 nr_parts = parse_mtd_partitions(sbcmtd[i], part_probes,
 135                                                 &sbcmtd_parts[i], 0);
 136                 if (nr_parts > 0) {
 137                         add_mtd_partitions (sbcmtd[i], sbcmtd_parts[i], nr_parts);
 138                         continue;
 139                 }
 140
 141                 /* No partitioning detected. Use default */
 142                 if (i == 2) {
 143                         add_mtd_device(sbcmtd[i]);
 144                 } else if (i == bigflash) {
 145                         add_mtd_partitions (sbcmtd[i], bigflash_parts, ARRAY_SIZE(bigflash_parts));
 146                 } else {
 147                         add_mtd_partitions (sbcmtd[i], smallflash_parts, ARRAY_SIZE(smallflash_parts));
 148                 }
 149         }
 150         return 0;
 151 }
 152
 153 static void __exit cleanup_sbc82xx_flash(void)
 154 {
 155         int i;
 156
 157         for (i=0; i<3; i++) {
 158                 if (!sbcmtd[i])
 159                         continue;
 160
 161                 if (i<2 || sbcmtd_parts[i])
 162                         del_mtd_partitions(sbcmtd[i]);
 163                 else
 164                         del_mtd_device(sbcmtd[i]);
 165
 166                 kfree(sbcmtd_parts[i]);
 167                 map_destroy(sbcmtd[i]);
 168
 169                 iounmap((void *)sbc82xx_flash_map[i].virt);
 170                 sbc82xx_flash_map[i].virt = 0;
 171         }
 172 }
 173
 174 module_init(init_sbc82xx_flash);
 175 module_exit(cleanup_sbc82xx_flash);
 176
 177
 178 MODULE_LICENSE("GPL");
 179 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 180 MODULE_DESCRIPTION("Flash map driver for WindRiver PowerQUICC II");