Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /****************************************************************************/ |
| 2 | |
| 3 | /* |
| 4 | * uclinux.c -- generic memory mapped MTD driver for uclinux |
| 5 | * |
| 6 | * (C) Copyright 2002, Greg Ungerer (gerg@snapgear.com) |
Paul Gortmaker | 025ce02 | 2016-03-27 12:13:54 -0400 | [diff] [blame] | 7 | * |
| 8 | * License: GPL |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | */ |
| 10 | |
| 11 | /****************************************************************************/ |
| 12 | |
Paul Gortmaker | 025ce02 | 2016-03-27 12:13:54 -0400 | [diff] [blame] | 13 | #include <linux/moduleparam.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/types.h> |
| 15 | #include <linux/init.h> |
| 16 | #include <linux/kernel.h> |
| 17 | #include <linux/fs.h> |
Andrea Righi | 27ac792 | 2008-07-23 21:28:13 -0700 | [diff] [blame] | 18 | #include <linux/mm.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <linux/major.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/mtd/mtd.h> |
| 21 | #include <linux/mtd/map.h> |
| 22 | #include <linux/mtd/partitions.h> |
| 23 | #include <asm/io.h> |
Geert Uytterhoeven | 363737d | 2012-05-31 22:39:21 +0200 | [diff] [blame] | 24 | #include <asm/sections.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | |
| 26 | /****************************************************************************/ |
| 27 | |
Uwe Kleine-König | 81f53ff | 2013-01-16 15:36:55 +0100 | [diff] [blame] | 28 | #ifdef CONFIG_MTD_ROM |
| 29 | #define MAP_NAME "rom" |
| 30 | #else |
| 31 | #define MAP_NAME "ram" |
| 32 | #endif |
| 33 | |
Thomas Huth | 251f26c | 2019-04-27 17:14:57 +0200 | [diff] [blame] | 34 | static struct map_info uclinux_ram_map = { |
Uwe Kleine-König | 81f53ff | 2013-01-16 15:36:55 +0100 | [diff] [blame] | 35 | .name = MAP_NAME, |
Mike Frysinger | fa254ec | 2009-05-26 19:33:16 -0400 | [diff] [blame] | 36 | .size = 0, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | }; |
| 38 | |
Uwe Kleine-König | 81f53ff | 2013-01-16 15:36:55 +0100 | [diff] [blame] | 39 | static unsigned long physaddr = -1; |
| 40 | module_param(physaddr, ulong, S_IRUGO); |
| 41 | |
Mike Frysinger | 9f31f4b | 2009-05-26 19:33:17 -0400 | [diff] [blame] | 42 | static struct mtd_info *uclinux_ram_mtdinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | |
| 44 | /****************************************************************************/ |
| 45 | |
Arvind Yadav | d490668 | 2017-08-28 13:54:57 +0530 | [diff] [blame] | 46 | static const struct mtd_partition uclinux_romfs[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | { .name = "ROMfs" } |
| 48 | }; |
| 49 | |
Tobias Klauser | 87d10f3 | 2006-03-31 02:29:45 -0800 | [diff] [blame] | 50 | #define NUM_PARTITIONS ARRAY_SIZE(uclinux_romfs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | |
| 52 | /****************************************************************************/ |
| 53 | |
Mike Frysinger | 9f31f4b | 2009-05-26 19:33:17 -0400 | [diff] [blame] | 54 | static int uclinux_point(struct mtd_info *mtd, loff_t from, size_t len, |
Jared Hulbert | a98889f | 2008-04-29 23:26:49 -0700 | [diff] [blame] | 55 | size_t *retlen, void **virt, resource_size_t *phys) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | { |
| 57 | struct map_info *map = mtd->priv; |
Jared Hulbert | a98889f | 2008-04-29 23:26:49 -0700 | [diff] [blame] | 58 | *virt = map->virt + from; |
| 59 | if (phys) |
| 60 | *phys = map->phys + from; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | *retlen = len; |
| 62 | return(0); |
| 63 | } |
| 64 | |
| 65 | /****************************************************************************/ |
| 66 | |
Dmitri Vorobiev | 769455e | 2008-11-25 02:55:09 +0200 | [diff] [blame] | 67 | static int __init uclinux_mtd_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | { |
| 69 | struct mtd_info *mtd; |
| 70 | struct map_info *mapp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | |
| 72 | mapp = &uclinux_ram_map; |
Uwe Kleine-König | 81f53ff | 2013-01-16 15:36:55 +0100 | [diff] [blame] | 73 | |
| 74 | if (physaddr == -1) |
| 75 | mapp->phys = (resource_size_t)__bss_stop; |
| 76 | else |
| 77 | mapp->phys = physaddr; |
| 78 | |
Mike Frysinger | fa254ec | 2009-05-26 19:33:16 -0400 | [diff] [blame] | 79 | if (!mapp->size) |
| 80 | mapp->size = PAGE_ALIGN(ntohl(*((unsigned long *)(mapp->phys + 8)))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | mapp->bankwidth = 4; |
| 82 | |
Uwe Kleine-König | 81f53ff | 2013-01-16 15:36:55 +0100 | [diff] [blame] | 83 | printk("uclinux[mtd]: probe address=0x%x size=0x%x\n", |
Greg Ungerer | f6515db | 2005-09-12 11:18:10 +1000 | [diff] [blame] | 84 | (int) mapp->phys, (int) mapp->size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | |
Greg Ungerer | 08a3c4b | 2012-07-19 15:42:45 +1000 | [diff] [blame] | 86 | /* |
| 87 | * The filesystem is guaranteed to be in direct mapped memory. It is |
| 88 | * directly following the kernels own bss region. Following the same |
| 89 | * mechanism used by architectures setting up traditional initrds we |
| 90 | * use phys_to_virt to get the virtual address of its start. |
| 91 | */ |
| 92 | mapp->virt = phys_to_virt(mapp->phys); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | |
| 94 | if (mapp->virt == 0) { |
Greg Ungerer | 08a3c4b | 2012-07-19 15:42:45 +1000 | [diff] [blame] | 95 | printk("uclinux[mtd]: no virtual mapping?\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | return(-EIO); |
| 97 | } |
| 98 | |
| 99 | simple_map_init(mapp); |
| 100 | |
Uwe Kleine-König | 81f53ff | 2013-01-16 15:36:55 +0100 | [diff] [blame] | 101 | mtd = do_map_probe("map_" MAP_NAME, mapp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | if (!mtd) { |
| 103 | printk("uclinux[mtd]: failed to find a mapping?\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | return(-ENXIO); |
| 105 | } |
Thomas Gleixner | 69f34c9 | 2005-11-07 11:15:40 +0000 | [diff] [blame] | 106 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | mtd->owner = THIS_MODULE; |
Artem Bityutskiy | 3c3c10b | 2012-01-30 14:58:32 +0200 | [diff] [blame] | 108 | mtd->_point = uclinux_point; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | mtd->priv = mapp; |
| 110 | |
| 111 | uclinux_ram_mtdinfo = mtd; |
Jamie Iles | 5e7e968 | 2011-05-23 10:23:12 +0100 | [diff] [blame] | 112 | mtd_device_register(mtd, uclinux_romfs, NUM_PARTITIONS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | return(0); |
| 115 | } |
Paul Gortmaker | 025ce02 | 2016-03-27 12:13:54 -0400 | [diff] [blame] | 116 | device_initcall(uclinux_mtd_init); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | |
| 118 | /****************************************************************************/ |