mtd/maps/cfi_flagadm.c

0001 /*
0002  *  Copyright © 2001 Flaga hf. Medical Devices, Kári Davíðsson <kd@flaga.is>
0003  *
0004  *  This program is free software; you can redistribute  it and/or modify it
0005  *  under  the terms of  the GNU General  Public License as published by the
0006  *  Free Software Foundation;  either version 2 of the  License, or (at your
0007  *  option) any later version.
0008  *
0009  *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
0010  *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
0011  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
0012  *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
0013  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
0014  *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
0015  *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
0016  *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
0017  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
0018  *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
0019  *
0020  *  You should have received a copy of the  GNU General Public License along
0021  *  with this program; if not, write  to the Free Software Foundation, Inc.,
0022  *  675 Mass Ave, Cambridge, MA 02139, USA.
0023  */
0024
0025 #include <linux/module.h>
0026 #include <linux/types.h>
0027 #include <linux/kernel.h>
0028 #include <linux/init.h>
0029 #include <asm/io.h>
0030 #include <linux/mtd/mtd.h>
0031 #include <linux/mtd/map.h>
0032 #include <linux/mtd/partitions.h>
0033
0034
0035 /* We split the flash chip up into four parts.
0036  * 1: bootloader first 128k         (0x00000000 - 0x0001FFFF) size 0x020000
0037  * 2: kernel 640k                   (0x00020000 - 0x000BFFFF) size 0x0A0000
0038  * 3: compressed 1536k root ramdisk (0x000C0000 - 0x0023FFFF) size 0x180000
0039  * 4: writeable diskpartition (jffs)(0x00240000 - 0x003FFFFF) size 0x1C0000
0040  */
0041
0042 #define FLASH_PHYS_ADDR 0x40000000
0043 #define FLASH_SIZE 0x400000
0044
0045 #define FLASH_PARTITION0_ADDR 0x00000000
0046 #define FLASH_PARTITION0_SIZE 0x00020000
0047
0048 #define FLASH_PARTITION1_ADDR 0x00020000
0049 #define FLASH_PARTITION1_SIZE 0x000A0000
0050
0051 #define FLASH_PARTITION2_ADDR 0x000C0000
0052 #define FLASH_PARTITION2_SIZE 0x00180000
0053
0054 #define FLASH_PARTITION3_ADDR 0x00240000
0055 #define FLASH_PARTITION3_SIZE 0x001C0000
0056
0057
0058 static struct map_info flagadm_map = {
0059         .name =     "FlagaDM flash device",
0060         .size =     FLASH_SIZE,
0061         .bankwidth =    2,
0062 };
0063
0064 static const struct mtd_partition flagadm_parts[] = {
0065     {
0066         .name =     "Bootloader",
0067         .offset =   FLASH_PARTITION0_ADDR,
0068         .size =     FLASH_PARTITION0_SIZE
0069     },
0070     {
0071         .name =     "Kernel image",
0072         .offset =   FLASH_PARTITION1_ADDR,
0073         .size =     FLASH_PARTITION1_SIZE
0074     },
0075     {
0076         .name =     "Initial ramdisk image",
0077         .offset =   FLASH_PARTITION2_ADDR,
0078         .size =     FLASH_PARTITION2_SIZE
0079     },
0080     {
0081         .name =     "Persistent storage",
0082         .offset =   FLASH_PARTITION3_ADDR,
0083         .size =     FLASH_PARTITION3_SIZE
0084     }
0085 };
0086
0087 #define PARTITION_COUNT ARRAY_SIZE(flagadm_parts)
0088
0089 static struct mtd_info *mymtd;
0090
0091 static int __init init_flagadm(void)
0092 {
0093     printk(KERN_NOTICE "FlagaDM flash device: %x at %x\n",
0094             FLASH_SIZE, FLASH_PHYS_ADDR);
0095
0096     flagadm_map.phys = FLASH_PHYS_ADDR;
0097     flagadm_map.virt = ioremap(FLASH_PHYS_ADDR,
0098                     FLASH_SIZE);
0099
0100     if (!flagadm_map.virt) {
0101         printk("Failed to ioremap\n");
0102         return -EIO;
0103     }
0104
0105     simple_map_init(&flagadm_map);
0106
0107     mymtd = do_map_probe("cfi_probe", &flagadm_map);
0108     if (mymtd) {
0109         mymtd->owner = THIS_MODULE;
0110         mtd_device_register(mymtd, flagadm_parts, PARTITION_COUNT);
0111         printk(KERN_NOTICE "FlagaDM flash device initialized\n");
0112         return 0;
0113     }
0114
0115     iounmap((void __iomem *)flagadm_map.virt);
0116     return -ENXIO;
0117 }
0118
0119 static void __exit cleanup_flagadm(void)
0120 {
0121     if (mymtd) {
0122         mtd_device_unregister(mymtd);
0123         map_destroy(mymtd);
0124     }
0125     if (flagadm_map.virt) {
0126         iounmap((void __iomem *)flagadm_map.virt);
0127         flagadm_map.virt = NULL;
0128     }
0129 }
0130
0131 module_init(init_flagadm);
0132 module_exit(cleanup_flagadm);
0133
0134
0135 MODULE_LICENSE("GPL");
0136 MODULE_AUTHOR("Kári Davíðsson <kd@flaga.is>");
0137 MODULE_DESCRIPTION("MTD map driver for Flaga digital module");