diff options
Diffstat (limited to 'target/linux/ifxmips/files/drivers/mtd/maps')
| -rw-r--r-- | target/linux/ifxmips/files/drivers/mtd/maps/danube.c | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/target/linux/ifxmips/files/drivers/mtd/maps/danube.c b/target/linux/ifxmips/files/drivers/mtd/maps/danube.c new file mode 100644 index 000000000..25e9df3de --- /dev/null +++ b/target/linux/ifxmips/files/drivers/mtd/maps/danube.c @@ -0,0 +1,194 @@ +/* + * Driver for DANUBE flashmap + * + * 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 program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + * Copyright (C) 2004 Liu Peng Infineon IFAP DC COM CPE + * Copyright (C) 2007 John Crispin <blogic@openwrt.org> + */ + +#include <linux/module.h> +#include <linux/types.h> +#include <linux/kernel.h> +#include <asm/io.h> + +#include <linux/init.h> +#include <linux/mtd/mtd.h> +#include <linux/mtd/map.h> +#include <linux/mtd/partitions.h> +#include <linux/mtd/cfi.h> +#include <asm/danube/danube.h> +#include <linux/magic.h> + +static struct map_info +danube_map = { + .name = "DANUBE_FLASH", + .bankwidth = 2, + .size = 0x400000, +}; + +static map_word +danube_read16 (struct map_info * map, unsigned long adr) +{ + map_word temp; + + adr ^= 2; + temp.x[0] = *((__u16 *) (map->virt + adr)); + + return temp; +} + +static void +danube_write16 (struct map_info *map, map_word d, unsigned long adr) +{ + adr ^= 2; + *((__u16 *) (map->virt + adr)) = d.x[0]; +} + +void +danube_copy_from (struct map_info *map, void *to, unsigned long from, ssize_t len) +{ + u8 *p; + u8 *to_8; + + from = (unsigned long) (from + map->virt); + p = (u8 *) from; + to_8 = (u8 *) to; + while(len--){ + *to_8++ = *p++; + } +} + +void +danube_copy_to (struct map_info *map, unsigned long to, const void *from, ssize_t len) +{ + u8 *p = (u8*) from; + u8 *to_8; + + to += (unsigned long) map->virt; + to_8 = (u8*)to; + while(len--){ + *p++ = *to_8++; + } +} + +static struct mtd_partition +danube_partitions[4] = { + { + name:"U-Boot", + offset:0x00000000, + size:0x00020000, + }, + { + name:"U-Boot-Env", + offset:0x00020000, + size:0x00010000, + }, + { + name:"kernel", + offset:0x00030000, + size:0x0, + }, + { + name:"rootfs", + offset:0x0, + size:0x0, + }, +}; + +#define DANUBE_FLASH_START 0x10000000 +#define DANUBE_FLASH_MAX 0x2000000 + +int +find_uImage_size (unsigned long start_offset){ + unsigned long temp; + + danube_copy_from(&danube_map, &temp, start_offset + 12, 4); + printk("kernel size is %ld \n", temp + 0x40); + return temp + 0x40; +} + +int +detect_squashfs_partition (unsigned long start_offset){ + unsigned long temp; + + danube_copy_from(&danube_map, &temp, start_offset, 4); + + return (temp == SQUASHFS_MAGIC); +} + +int __init +init_danube_mtd (void) +{ + struct mtd_info *danube_mtd = NULL; + struct mtd_partition *parts = NULL; + unsigned long uimage_size; + + writel(0x1d7ff, DANUBE_EBU_BUSCON0); + + danube_map.read = danube_read16; + danube_map.write = danube_write16; + danube_map.copy_from = danube_copy_from; + danube_map.copy_to = danube_copy_to; + + danube_map.phys = DANUBE_FLASH_START; + danube_map.virt = ioremap_nocache(DANUBE_FLASH_START, DANUBE_FLASH_MAX); + danube_map.size = DANUBE_FLASH_MAX; + if (!danube_map.virt) { + printk(KERN_WARNING "Failed to ioremap!\n"); + return -EIO; + } + + danube_mtd = (struct mtd_info *) do_map_probe("cfi_probe", &danube_map); + if (!danube_mtd) { + iounmap(danube_map.virt); + printk("probing failed\n"); + return -ENXIO; + } + + danube_mtd->owner = THIS_MODULE; + + uimage_size = find_uImage_size(danube_partitions[2].offset); + + if(detect_squashfs_partition(danube_partitions[2].offset + uimage_size)){ + printk("Found a squashfs following the uImage\n"); + } else { + uimage_size &= ~0xffff; + uimage_size += 0x10000; + } + + danube_partitions[2].size = uimage_size; + danube_partitions[3].offset = danube_partitions[2].offset + danube_partitions[2].size; + danube_partitions[3].size = ((danube_mtd->size >> 20) * 1024 * 1024) - danube_partitions[3].offset; + + parts = &danube_partitions[0]; + add_mtd_partitions(danube_mtd, parts, 4); + + printk("Added danube flash with %dMB\n", danube_mtd->size >> 20); + return 0; +} + +static void +__exit +cleanup_danube_mtd (void) +{ +} + +module_init (init_danube_mtd); +module_exit (cleanup_danube_mtd); + +MODULE_LICENSE ("GPL"); +MODULE_AUTHOR ("John Crispin <blogic@openwrt.org>"); +MODULE_DESCRIPTION ("MTD map driver for DANUBE boards"); |