drivers/mtd/maps/redwood.c

   1 /*
   2  * drivers/mtd/maps/redwood.c
   3  *
   4  * FLASH map for the IBM Redwood 4/5/6 boards.
   5  *
   6  * Author: MontaVista Software, Inc. <source@mvista.com>
   7  *
   8  * 2001-2003 (c) MontaVista, Software, Inc. This file is licensed under
   9  * the terms of the GNU General Public License version 2. This program
  10  * is licensed "as is" without any warranty of any kind, whether express
  11  * or implied.
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/types.h>
  16 #include <linux/kernel.h>
  17 #include <linux/init.h>
  18
  19 #include <linux/mtd/mtd.h>
  20 #include <linux/mtd/map.h>
  21 #include <linux/mtd/partitions.h>
  22
  23 #include <asm/io.h>
  24
  25 #if !defined (CONFIG_REDWOOD_6)
  26
  27 #define WINDOW_ADDR 0xffc00000
  28 #define WINDOW_SIZE 0x00400000
  29
  30 #define RW_PART0_OF     0
  31 #define RW_PART0_SZ     0x10000
  32 #define RW_PART1_OF     RW_PART0_SZ
  33 #define RW_PART1_SZ     0x200000 - 0x10000
  34 #define RW_PART2_OF     0x200000
  35 #define RW_PART2_SZ     0x10000
  36 #define RW_PART3_OF     0x210000
  37 #define RW_PART3_SZ     0x200000 - (0x10000 + 0x20000)
  38 #define RW_PART4_OF     0x3e0000
  39 #define RW_PART4_SZ     0x20000
  40
  41 static struct mtd_partition redwood_flash_partitions[] = {
  42         {
  43                 .name = "Redwood OpenBIOS Vital Product Data",
  44                 .offset = RW_PART0_OF,
  45                 .size = RW_PART0_SZ,
  46                 .mask_flags = MTD_WRITEABLE     /* force read-only */
  47         },
  48         {
  49                 .name = "Redwood kernel",
  50                 .offset = RW_PART1_OF,
  51                 .size = RW_PART1_SZ
  52         },
  53         {
  54                 .name = "Redwood OpenBIOS non-volatile storage",
  55                 .offset = RW_PART2_OF,
  56                 .size = RW_PART2_SZ,
  57                 .mask_flags = MTD_WRITEABLE     /* force read-only */
  58         },
  59         {
  60                 .name = "Redwood filesystem",
  61                 .offset = RW_PART3_OF,
  62                 .size = RW_PART3_SZ
  63         },
  64         {
  65                 .name = "Redwood OpenBIOS",
  66                 .offset = RW_PART4_OF,
  67                 .size = RW_PART4_SZ,
  68                 .mask_flags = MTD_WRITEABLE     /* force read-only */
  69         }
  70 };
  71
  72 #else /* CONFIG_REDWOOD_6 */
  73 /* FIXME: the window is bigger - armin */
  74 #define WINDOW_ADDR 0xff800000
  75 #define WINDOW_SIZE 0x00800000
  76
  77 #define RW_PART0_OF     0
  78 #define RW_PART0_SZ     0x400000        /* 4 MiB data */
  79 #define RW_PART1_OF     RW_PART0_OF + RW_PART0_SZ
  80 #define RW_PART1_SZ     0x10000         /* 64K VPD */
  81 #define RW_PART2_OF     RW_PART1_OF + RW_PART1_SZ
  82 #define RW_PART2_SZ     0x400000 - (0x10000 + 0x20000)
  83 #define RW_PART3_OF     RW_PART2_OF + RW_PART2_SZ
  84 #define RW_PART3_SZ     0x20000
  85
  86 static struct mtd_partition redwood_flash_partitions[] = {
  87         {
  88                 .name = "Redwood filesystem",
  89                 .offset = RW_PART0_OF,
  90                 .size = RW_PART0_SZ
  91         },
  92         {
  93                 .name = "Redwood OpenBIOS Vital Product Data",
  94                 .offset = RW_PART1_OF,
  95                 .size = RW_PART1_SZ,
  96                 .mask_flags = MTD_WRITEABLE     /* force read-only */
  97         },
  98         {
  99                 .name = "Redwood kernel",
 100                 .offset = RW_PART2_OF,
 101                 .size = RW_PART2_SZ
 102         },
 103         {
 104                 .name = "Redwood OpenBIOS",
 105                 .offset = RW_PART3_OF,
 106                 .size = RW_PART3_SZ,
 107                 .mask_flags = MTD_WRITEABLE     /* force read-only */
 108         }
 109 };
 110
 111 #endif /* CONFIG_REDWOOD_6 */
 112
 113 struct map_info redwood_flash_map = {
 114         .name = "IBM Redwood",
 115         .size = WINDOW_SIZE,
 116         .bankwidth = 2,
 117         .phys = WINDOW_ADDR,
 118 };
 119
 120
 121 #define NUM_REDWOOD_FLASH_PARTITIONS ARRAY_SIZE(redwood_flash_partitions)
 122
 123 static struct mtd_info *redwood_mtd;
 124
 125 static int __init init_redwood_flash(void)
 126 {
 127         int err;
 128
 129         printk(KERN_NOTICE "redwood: flash mapping: %x at %x\n",
 130                         WINDOW_SIZE, WINDOW_ADDR);
 131
 132         redwood_flash_map.virt = ioremap(WINDOW_ADDR, WINDOW_SIZE);
 133
 134         if (!redwood_flash_map.virt) {
 135                 printk("init_redwood_flash: failed to ioremap\n");
 136                 return -EIO;
 137         }
 138         simple_map_init(&redwood_flash_map);
 139
 140         redwood_mtd = do_map_probe("cfi_probe",&redwood_flash_map);
 141
 142         if (redwood_mtd) {
 143                 redwood_mtd->owner = THIS_MODULE;
 144                 err = add_mtd_partitions(redwood_mtd,
 145                                 redwood_flash_partitions,
 146                                 NUM_REDWOOD_FLASH_PARTITIONS);
 147                 if (err) {
 148                         printk("init_redwood_flash: add_mtd_partitions failed\n");
 149                         iounmap(redwood_flash_map.virt);
 150                 }
 151                 return err;
 152
 153         }
 154
 155         iounmap(redwood_flash_map.virt);
 156         return -ENXIO;
 157 }
 158
 159 static void __exit cleanup_redwood_flash(void)
 160 {
 161         if (redwood_mtd) {
 162                 del_mtd_partitions(redwood_mtd);
 163                 /* moved iounmap after map_destroy - armin */
 164                 map_destroy(redwood_mtd);
 165                 iounmap((void *)redwood_flash_map.virt);
 166         }
 167 }
 168
 169 module_init(init_redwood_flash);
 170 module_exit(cleanup_redwood_flash);
 171
 172 MODULE_LICENSE("GPL");
 173 MODULE_AUTHOR("MontaVista Software <source@mvista.com>");
 174 MODULE_DESCRIPTION("MTD map driver for the IBM Redwood reference boards");