drivers/mtd/maps/wr_sbc82xx_flash.c

   1 /*
   2  * $Id: wr_sbc82xx_flash.c,v 1.7 2004/11/04 13:24:15 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/config.h>
  21 #include <linux/mtd/partitions.h>
  22
  23 #include <asm/immap_cpm2.h>
  24
  25 static struct mtd_info *sbcmtd[3];
  26 static struct mtd_partition *sbcmtd_parts[3];
  27
  28 struct map_info sbc82xx_flash_map[3] = {
  29         {.name = "Boot flash"},
  30         {.name = "Alternate boot flash"},
  31         {.name = "User flash"}
  32 };
  33
  34 static struct mtd_partition smallflash_parts[] = {
  35         {
  36                 .name =         "space",
  37                 .size =         0x100000,
  38                 .offset =       0,
  39         }, {
  40                 .name =         "bootloader",
  41                 .size =         MTDPART_SIZ_FULL,
  42                 .offset =       MTDPART_OFS_APPEND,
  43         }
  44 };
  45
  46 static struct mtd_partition bigflash_parts[] = {
  47         {
  48                 .name =         "bootloader",
  49                 .size =         0x00100000,
  50                 .offset =       0,
  51         }, {
  52                 .name =         "file system",
  53                 .size =         0x01f00000,
  54                 .offset =       MTDPART_OFS_APPEND,
  55         }, {
  56                 .name =         "boot config",
  57                 .size =         0x00100000,
  58                 .offset =       MTDPART_OFS_APPEND,
  59         }, {
  60                 .name =         "space",
  61                 .size =         0x01f00000,
  62                 .offset =       MTDPART_OFS_APPEND,
  63         }
  64 };
  65
  66 static const char *part_probes[] __initdata = {"cmdlinepart", "RedBoot", NULL};
  67
  68 #define init_sbc82xx_one_flash(map, br, or)                     \
  69 do {                                                            \
  70         (map).phys = (br & 1) ? (br & 0xffff8000) : 0;          \
  71         (map).size = (br & 1) ? (~(or & 0xffff8000) + 1) : 0;   \
  72         switch (br & 0x00001800) {                              \
  73         case 0x00000000:                                        \
  74         case 0x00000800:        (map).bankwidth = 1;    break;  \
  75         case 0x00001000:        (map).bankwidth = 2;    break;  \
  76         case 0x00001800:        (map).bankwidth = 4;    break;  \
  77         }                                                       \
  78 } while (0);
  79
  80 int __init init_sbc82xx_flash(void)
  81 {
  82         volatile memctl_cpm2_t *mc = &cpm2_immr->im_memctl;
  83         int bigflash;
  84         int i;
  85
  86 #ifdef CONFIG_SBC8560
  87         mc = ioremap(0xff700000 + 0x5000, sizeof(memctl_cpm2_t));
  88 #else
  89         mc = &cpm2_immr->im_memctl;
  90 #endif
  91
  92         bigflash = 1;
  93         if ((mc->memc_br0 & 0x00001800) == 0x00001800)
  94                 bigflash = 0;
  95
  96         init_sbc82xx_one_flash(sbc82xx_flash_map[0], mc->memc_br0, mc->memc_or0);
  97         init_sbc82xx_one_flash(sbc82xx_flash_map[1], mc->memc_br6, mc->memc_or6);
  98         init_sbc82xx_one_flash(sbc82xx_flash_map[2], mc->memc_br1, mc->memc_or1);
  99
 100 #ifdef CONFIG_SBC8560
 101         iounmap((void *) mc);
 102 #endif
 103
 104         for (i=0; i<3; i++) {
 105                 int8_t flashcs[3] = { 0, 6, 1 };
 106                 int nr_parts;
 107
 108                 printk(KERN_NOTICE "PowerQUICC II %s (%ld MiB on CS%d",
 109                        sbc82xx_flash_map[i].name,
 110                        (sbc82xx_flash_map[i].size >> 20),
 111                        flashcs[i]);
 112                 if (!sbc82xx_flash_map[i].phys) {
 113                         /* We know it can't be at zero. */
 114                         printk("): disabled by bootloader.\n");
 115                         continue;
 116                 }
 117                 printk(" at %08lx)\n",  sbc82xx_flash_map[i].phys);
 118
 119                 sbc82xx_flash_map[i].virt = ioremap(sbc82xx_flash_map[i].phys, sbc82xx_flash_map[i].size);
 120
 121                 if (!sbc82xx_flash_map[i].virt) {
 122                         printk("Failed to ioremap\n");
 123                         continue;
 124                 }
 125
 126                 simple_map_init(&sbc82xx_flash_map[i]);
 127
 128                 sbcmtd[i] = do_map_probe("cfi_probe", &sbc82xx_flash_map[i]);
 129
 130                 if (!sbcmtd[i])
 131                         continue;
 132
 133                 sbcmtd[i]->owner = THIS_MODULE;
 134
 135                 nr_parts = parse_mtd_partitions(sbcmtd[i], part_probes,
 136                                                 &sbcmtd_parts[i], 0);
 137                 if (nr_parts > 0) {
 138                         add_mtd_partitions (sbcmtd[i], sbcmtd_parts[i], nr_parts);
 139                         continue;
 140                 }
 141
 142                 /* No partitioning detected. Use default */
 143                 if (i == 2) {
 144                         add_mtd_device(sbcmtd[i]);
 145                 } else if (i == bigflash) {
 146                         add_mtd_partitions (sbcmtd[i], bigflash_parts, ARRAY_SIZE(bigflash_parts));
 147                 } else {
 148                         add_mtd_partitions (sbcmtd[i], smallflash_parts, ARRAY_SIZE(smallflash_parts));
 149                 }
 150         }
 151         return 0;
 152 }
 153
 154 static void __exit cleanup_sbc82xx_flash(void)
 155 {
 156         int i;
 157
 158         for (i=0; i<3; i++) {
 159                 if (!sbcmtd[i])
 160                         continue;
 161
 162                 if (i<2 || sbcmtd_parts[i])
 163                         del_mtd_partitions(sbcmtd[i]);
 164                 else
 165                         del_mtd_device(sbcmtd[i]);
 166
 167                 kfree(sbcmtd_parts[i]);
 168                 map_destroy(sbcmtd[i]);
 169
 170                 iounmap((void *)sbc82xx_flash_map[i].virt);
 171                 sbc82xx_flash_map[i].virt = 0;
 172         }
 173 }
 174
 175 module_init(init_sbc82xx_flash);
 176 module_exit(cleanup_sbc82xx_flash);
 177
 178
 179 MODULE_LICENSE("GPL");
 180 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 181 MODULE_DESCRIPTION("Flash map driver for WindRiver PowerQUICC II");