| Marc St-Jean | 68aa0fa | 2007-03-26 21:45:41 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Mapping of the rootfs in a physical region of memory |
| 3 | * |
| 4 | * Copyright (C) 2005-2007 PMC-Sierra Inc. |
| 5 | * Author: Andrew Hughes, Andrew_Hughes@pmc-sierra.com |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify it |
| 8 | * under the terms of the GNU General Public License as published by the |
| 9 | * Free Software Foundation; either version 2 of the License, or (at your |
| 10 | * option) any later version. |
| 11 | * |
| 12 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| 13 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| 14 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN |
| 15 | * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 16 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 17 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
| 18 | * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON |
| 19 | * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 20 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 21 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 22 | * |
| 23 | * You should have received a copy of the GNU General Public License along |
| 24 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 25 | * 675 Mass Ave, Cambridge, MA 02139, USA. |
| 26 | */ |
| 27 | |
| 28 | #include <linux/module.h> |
| 29 | #include <linux/types.h> |
| 30 | #include <linux/kernel.h> |
| 31 | #include <linux/init.h> |
| 32 | #include <linux/slab.h> |
| 33 | #include <linux/fs.h> |
| 34 | #include <linux/root_dev.h> |
| 35 | #include <linux/mtd/mtd.h> |
| 36 | #include <linux/mtd/map.h> |
| 37 | |
| 38 | #include <asm/io.h> |
| 39 | |
| 40 | #include <msp_prom.h> |
| 41 | |
| 42 | static struct mtd_info *rr_mtd; |
| 43 | |
| 44 | struct map_info rr_map = { |
| 45 | .name = "ramroot", |
| 46 | .bankwidth = 4, |
| 47 | }; |
| 48 | |
| 49 | static int __init init_rrmap(void) |
| 50 | { |
| 51 | void *ramroot_start; |
| 52 | unsigned long ramroot_size; |
| 53 | |
| 54 | /* Check for supported rootfs types */ |
| 55 | if (get_ramroot(&ramroot_start, &ramroot_size)) { |
| 56 | rr_map.phys = CPHYSADDR(ramroot_start); |
| 57 | rr_map.size = ramroot_size; |
| 58 | |
| 59 | printk(KERN_NOTICE |
| 60 | "PMC embedded root device: 0x%08lx @ 0x%08lx\n", |
| 61 | rr_map.size, (unsigned long)rr_map.phys); |
| 62 | } else { |
| 63 | printk(KERN_ERR |
| 64 | "init_rrmap: no supported embedded rootfs detected!\n"); |
| 65 | return -ENXIO; |
| 66 | } |
| 67 | |
| 68 | /* Map rootfs to I/O space for block device driver */ |
| 69 | rr_map.virt = ioremap(rr_map.phys, rr_map.size); |
| 70 | if (!rr_map.virt) { |
| 71 | printk(KERN_ERR "Failed to ioremap\n"); |
| 72 | return -EIO; |
| 73 | } |
| 74 | |
| 75 | simple_map_init(&rr_map); |
| 76 | |
| 77 | rr_mtd = do_map_probe("map_ram", &rr_map); |
| 78 | if (rr_mtd) { |
| 79 | rr_mtd->owner = THIS_MODULE; |
| 80 | |
| 81 | add_mtd_device(rr_mtd); |
| 82 | ROOT_DEV = MKDEV(MTD_BLOCK_MAJOR, rr_mtd->index); |
| 83 | |
| 84 | return 0; |
| 85 | } |
| 86 | |
| 87 | iounmap(rr_map.virt); |
| 88 | return -ENXIO; |
| 89 | } |
| 90 | |
| 91 | static void __exit cleanup_rrmap(void) |
| 92 | { |
| 93 | del_mtd_device(rr_mtd); |
| 94 | map_destroy(rr_mtd); |
| 95 | |
| 96 | iounmap(rr_map.virt); |
| 97 | rr_map.virt = NULL; |
| 98 | } |
| 99 | |
| 100 | MODULE_AUTHOR("PMC-Sierra, Inc"); |
| 101 | MODULE_DESCRIPTION("MTD map driver for embedded PMC-Sierra MSP filesystem"); |
| 102 | MODULE_LICENSE("GPL"); |
| 103 | |
| 104 | module_init(init_rrmap); |
| 105 | module_exit(cleanup_rrmap); |