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