diff options
Diffstat (limited to 'drivers/mtd/maps/cfi_flagadm.c')
| -rw-r--r-- | drivers/mtd/maps/cfi_flagadm.c | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/drivers/mtd/maps/cfi_flagadm.c b/drivers/mtd/maps/cfi_flagadm.c new file mode 100644 index 000000000..d504b3d17 --- /dev/null +++ b/drivers/mtd/maps/cfi_flagadm.c @@ -0,0 +1,137 @@ +/* + * Copyright © 2001 Flaga hf. Medical Devices, Kári Davíðsson <kd@flaga.is> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN + * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF + * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON + * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include <linux/module.h> +#include <linux/types.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <asm/io.h> +#include <linux/mtd/mtd.h> +#include <linux/mtd/map.h> +#include <linux/mtd/partitions.h> + + +/* We split the flash chip up into four parts. + * 1: bootloader first 128k (0x00000000 - 0x0001FFFF) size 0x020000 + * 2: kernel 640k (0x00020000 - 0x000BFFFF) size 0x0A0000 + * 3: compressed 1536k root ramdisk (0x000C0000 - 0x0023FFFF) size 0x180000 + * 4: writeable diskpartition (jffs)(0x00240000 - 0x003FFFFF) size 0x1C0000 + */ + +#define FLASH_PHYS_ADDR 0x40000000 +#define FLASH_SIZE 0x400000 + +#define FLASH_PARTITION0_ADDR 0x00000000 +#define FLASH_PARTITION0_SIZE 0x00020000 + +#define FLASH_PARTITION1_ADDR 0x00020000 +#define FLASH_PARTITION1_SIZE 0x000A0000 + +#define FLASH_PARTITION2_ADDR 0x000C0000 +#define FLASH_PARTITION2_SIZE 0x00180000 + +#define FLASH_PARTITION3_ADDR 0x00240000 +#define FLASH_PARTITION3_SIZE 0x001C0000 + + +static struct map_info flagadm_map = { + .name = "FlagaDM flash device", + .size = FLASH_SIZE, + .bankwidth = 2, +}; + +static struct mtd_partition flagadm_parts[] = { + { + .name = "Bootloader", + .offset = FLASH_PARTITION0_ADDR, + .size = FLASH_PARTITION0_SIZE + }, + { + .name = "Kernel image", + .offset = FLASH_PARTITION1_ADDR, + .size = FLASH_PARTITION1_SIZE + }, + { + .name = "Initial ramdisk image", + .offset = FLASH_PARTITION2_ADDR, + .size = FLASH_PARTITION2_SIZE + }, + { + .name = "Persistent storage", + .offset = FLASH_PARTITION3_ADDR, + .size = FLASH_PARTITION3_SIZE + } +}; + +#define PARTITION_COUNT ARRAY_SIZE(flagadm_parts) + +static struct mtd_info *mymtd; + +static int __init init_flagadm(void) +{ + printk(KERN_NOTICE "FlagaDM flash device: %x at %x\n", + FLASH_SIZE, FLASH_PHYS_ADDR); + + flagadm_map.phys = FLASH_PHYS_ADDR; + flagadm_map.virt = ioremap(FLASH_PHYS_ADDR, + FLASH_SIZE); + + if (!flagadm_map.virt) { + printk("Failed to ioremap\n"); + return -EIO; + } + + simple_map_init(&flagadm_map); + + mymtd = do_map_probe("cfi_probe", &flagadm_map); + if (mymtd) { + mymtd->owner = THIS_MODULE; + mtd_device_register(mymtd, flagadm_parts, PARTITION_COUNT); + printk(KERN_NOTICE "FlagaDM flash device initialized\n"); + return 0; + } + + iounmap((void __iomem *)flagadm_map.virt); + return -ENXIO; +} + +static void __exit cleanup_flagadm(void) +{ + if (mymtd) { + mtd_device_unregister(mymtd); + map_destroy(mymtd); + } + if (flagadm_map.virt) { + iounmap((void __iomem *)flagadm_map.virt); + flagadm_map.virt = NULL; + } +} + +module_init(init_flagadm); +module_exit(cleanup_flagadm); + + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Kári Davíðsson <kd@flaga.is>"); +MODULE_DESCRIPTION("MTD map driver for Flaga digital module"); |