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 static struct mtd_partition *sbcmtd_parts[3];
  24
  25 struct map_info sbc82xx_flash_map[3] = {
  26         {.name = "Boot flash"},
  27         {.name = "Alternate boot flash"},
  28         {.name = "User flash"}
  29 };
  30
  31 static struct mtd_partition smallflash_parts[] = {
  32         {
  33                 .name =         "space",
  34                 .size =         0x100000,
  35                 .offset =       0,
  36         }, {
  37                 .name =         "bootloader",
  38                 .size =         MTDPART_SIZ_FULL,
  39                 .offset =       MTDPART_OFS_APPEND,
  40         }
  41 };
  42
  43 static struct mtd_partition bigflash_parts[] = {
  44         {
  45                 .name =         "bootloader",
  46                 .size =         0x00100000,
  47                 .offset =       0,
  48         }, {
  49                 .name =         "file system",
  50                 .size =         0x01f00000,
  51                 .offset =       MTDPART_OFS_APPEND,
  52         }, {
  53                 .name =         "boot config",
  54                 .size =         0x00100000,
  55                 .offset =       MTDPART_OFS_APPEND,
  56         }, {
  57                 .name =         "space",
  58                 .size =         0x01f00000,
  59                 .offset =       MTDPART_OFS_APPEND,
  60         }
  61 };
  62
  63 static const char *part_probes[] __initdata = {"cmdlinepart", "RedBoot", NULL};
  64
  65 #define init_sbc82xx_one_flash(map, br, or)                     \
  66 do {                                                            \
  67         (map).phys = (br & 1) ? (br & 0xffff8000) : 0;          \
  68         (map).size = (br & 1) ? (~(or & 0xffff8000) + 1) : 0;   \
  69         switch (br & 0x00001800) {                              \
  70         case 0x00000000:                                        \
  71         case 0x00000800:        (map).bankwidth = 1;    break;  \
  72         case 0x00001000:        (map).bankwidth = 2;    break;  \
  73         case 0x00001800:        (map).bankwidth = 4;    break;  \
  74         }                                                       \
  75 } while (0);
  76
  77 static int __init init_sbc82xx_flash(void)
  78 {
  79         volatile memctl_cpm2_t *mc = &cpm2_immr->im_memctl;
  80         int bigflash;
  81         int i;
  82
  83 #ifdef CONFIG_SBC8560
  84         mc = ioremap(0xff700000 + 0x5000, sizeof(memctl_cpm2_t));
  85 #else
  86         mc = &cpm2_immr->im_memctl;
  87 #endif
  88
  89         bigflash = 1;
  90         if ((mc->memc_br0 & 0x00001800) == 0x00001800)
  91                 bigflash = 0;
  92
  93         init_sbc82xx_one_flash(sbc82xx_flash_map[0], mc->memc_br0, mc->memc_or0);
  94         init_sbc82xx_one_flash(sbc82xx_flash_map[1], mc->memc_br6, mc->memc_or6);
  95         init_sbc82xx_one_flash(sbc82xx_flash_map[2], mc->memc_br1, mc->memc_or1);
  96
  97 #ifdef CONFIG_SBC8560
  98         iounmap((void *) mc);
  99 #endif
 100
 101         for (i=0; i<3; i++) {
 102                 int8_t flashcs[3] = { 0, 6, 1 };
 103                 int nr_parts;
 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, sbc82xx_flash_map[i].size);
 117
 118                 if (!sbc82xx_flash_map[i].virt) {
 119                         printk("Failed to ioremap\n");
 120                         continue;
 121                 }
 122
 123                 simple_map_init(&sbc82xx_flash_map[i]);
 124
 125                 sbcmtd[i] = do_map_probe("cfi_probe", &sbc82xx_flash_map[i]);
 126
 127                 if (!sbcmtd[i])
 128                         continue;
 129
 130                 sbcmtd[i]->owner = THIS_MODULE;
 131
 132                 nr_parts = parse_mtd_partitions(sbcmtd[i], part_probes,
 133                                                 &sbcmtd_parts[i], 0);
 134                 if (nr_parts > 0) {
 135                         mtd_device_register(sbcmtd[i], sbcmtd_parts[i],
 136                                             nr_parts);
 137                         continue;
 138                 }
 139
 140                 /* No partitioning detected. Use default */
 141                 if (i == 2) {
 142                         mtd_device_register(sbcmtd[i], NULL, 0);
 143                 } else if (i == bigflash) {
 144                         mtd_device_register(sbcmtd[i], bigflash_parts,
 145                                             ARRAY_SIZE(bigflash_parts));
 146                 } else {
 147                         mtd_device_register(sbcmtd[i], smallflash_parts,
 148                                             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                         mtd_device_unregister(sbcmtd[i]);
 164                 else
 165                         mtd_device_unregister(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");