tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/****************************************************************************/
2
3/*
4 * uclinux.c -- generic memory mapped MTD driver for uclinux
5 *
6 * (C) Copyright 2002, Greg Ungerer (gerg@snapgear.com)
7 *
8 * License: GPL
9 */
10
11/****************************************************************************/
12
13#include <linux/moduleparam.h>
14#include <linux/types.h>
15#include <linux/init.h>
16#include <linux/kernel.h>
17#include <linux/fs.h>
18#include <linux/mm.h>
19#include <linux/major.h>
20#include <linux/mtd/mtd.h>
21#include <linux/mtd/map.h>
22#include <linux/mtd/partitions.h>
23#include <asm/io.h>
24#include <asm/sections.h>
25
26/****************************************************************************/
27
28#ifdef CONFIG_MTD_ROM
29#define MAP_NAME "rom"
30#else
31#define MAP_NAME "ram"
32#endif
33
34/*
35 * Blackfin uses uclinux_ram_map during startup, so it must not be static.
36 * Provide a dummy declaration to make sparse happy.
37 */
38extern struct map_info uclinux_ram_map;
39
40struct map_info uclinux_ram_map = {
41 .name = MAP_NAME,
42 .size = 0,
43};
44
45static unsigned long physaddr = -1;
46module_param(physaddr, ulong, S_IRUGO);
47
48static struct mtd_info *uclinux_ram_mtdinfo;
49
50/****************************************************************************/
51
52static const struct mtd_partition uclinux_romfs[] = {
53 { .name = "ROMfs" }
54};
55
56#define NUM_PARTITIONS ARRAY_SIZE(uclinux_romfs)
57
58/****************************************************************************/
59
60static int uclinux_point(struct mtd_info *mtd, loff_t from, size_t len,
61 size_t *retlen, void **virt, resource_size_t *phys)
62{
63 struct map_info *map = mtd->priv;
64 *virt = map->virt + from;
65 if (phys)
66 *phys = map->phys + from;
67 *retlen = len;
68 return(0);
69}
70
71/****************************************************************************/
72
73static int __init uclinux_mtd_init(void)
74{
75 struct mtd_info *mtd;
76 struct map_info *mapp;
77
78 mapp = &uclinux_ram_map;
79
80 if (physaddr == -1)
81 mapp->phys = (resource_size_t)__bss_stop;
82 else
83 mapp->phys = physaddr;
84
85 if (!mapp->size)
86 mapp->size = PAGE_ALIGN(ntohl(*((unsigned long *)(mapp->phys + 8))));
87 mapp->bankwidth = 4;
88
89 printk("uclinux[mtd]: probe address=0x%x size=0x%x\n",
90 (int) mapp->phys, (int) mapp->size);
91
92 /*
93 * The filesystem is guaranteed to be in direct mapped memory. It is
94 * directly following the kernels own bss region. Following the same
95 * mechanism used by architectures setting up traditional initrds we
96 * use phys_to_virt to get the virtual address of its start.
97 */
98 mapp->virt = phys_to_virt(mapp->phys);
99
100 if (mapp->virt == 0) {
101 printk("uclinux[mtd]: no virtual mapping?\n");
102 return(-EIO);
103 }
104
105 simple_map_init(mapp);
106
107 mtd = do_map_probe("map_" MAP_NAME, mapp);
108 if (!mtd) {
109 printk("uclinux[mtd]: failed to find a mapping?\n");
110 return(-ENXIO);
111 }
112
113 mtd->owner = THIS_MODULE;
114 mtd->_point = uclinux_point;
115 mtd->priv = mapp;
116
117 uclinux_ram_mtdinfo = mtd;
118 mtd_device_register(mtd, uclinux_romfs, NUM_PARTITIONS);
119
120 return(0);
121}
122device_initcall(uclinux_mtd_init);
123
124/****************************************************************************/