drivers/mtd/maps/wr_sbc82xx_flash.c

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