1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* netsc520.c -- MTD map driver for AMD NetSc520 Demonstration Board |
3 | * |
4 | * Copyright (C) 2001 Mark Langsdorf (mark.langsdorf@amd.com) |
5 | * based on sc520cdp.c by Sysgo Real-Time Solutions GmbH |
6 | * |
7 | * The NetSc520 is a demonstration board for the Elan Sc520 processor available |
8 | * from AMD. It has a single back of 16 megs of 32-bit Flash ROM and another |
9 | * 16 megs of SDRAM. |
10 | */ |
11 | |
12 | #include <linux/module.h> |
13 | #include <linux/types.h> |
14 | #include <linux/kernel.h> |
15 | #include <linux/init.h> |
16 | #include <asm/io.h> |
17 | #include <linux/mtd/mtd.h> |
18 | #include <linux/mtd/map.h> |
19 | #include <linux/mtd/partitions.h> |
20 | |
21 | |
22 | /* |
23 | ** The single, 16 megabyte flash bank is divided into four virtual |
24 | ** partitions. The first partition is 768 KiB and is intended to |
25 | ** store the kernel image loaded by the bootstrap loader. The second |
26 | ** partition is 256 KiB and holds the BIOS image. The third |
27 | ** partition is 14.5 MiB and is intended for the flash file system |
28 | ** image. The last partition is 512 KiB and contains another copy |
29 | ** of the BIOS image and the reset vector. |
30 | ** |
31 | ** Only the third partition should be mounted. The first partition |
32 | ** should not be mounted, but it can erased and written to using the |
33 | ** MTD character routines. The second and fourth partitions should |
34 | ** not be touched - it is possible to corrupt the BIOS image by |
35 | ** mounting these partitions, and potentially the board will not be |
36 | ** recoverable afterwards. |
37 | */ |
38 | |
39 | /* partition_info gives details on the logical partitions that the split the |
40 | * single flash device into. If the size if zero we use up to the end of the |
41 | * device. */ |
42 | static const struct mtd_partition partition_info[] = { |
43 | { |
44 | .name = "NetSc520 boot kernel" , |
45 | .offset = 0, |
46 | .size = 0xc0000 |
47 | }, |
48 | { |
49 | .name = "NetSc520 Low BIOS" , |
50 | .offset = 0xc0000, |
51 | .size = 0x40000 |
52 | }, |
53 | { |
54 | .name = "NetSc520 file system" , |
55 | .offset = 0x100000, |
56 | .size = 0xe80000 |
57 | }, |
58 | { |
59 | .name = "NetSc520 High BIOS" , |
60 | .offset = 0xf80000, |
61 | .size = 0x80000 |
62 | }, |
63 | }; |
64 | #define NUM_PARTITIONS ARRAY_SIZE(partition_info) |
65 | |
66 | #define WINDOW_SIZE 0x00100000 |
67 | #define WINDOW_ADDR 0x00200000 |
68 | |
69 | static struct map_info netsc520_map = { |
70 | .name = "netsc520 Flash Bank" , |
71 | .size = WINDOW_SIZE, |
72 | .bankwidth = 4, |
73 | .phys = WINDOW_ADDR, |
74 | }; |
75 | |
76 | #define NUM_FLASH_BANKS ARRAY_SIZE(netsc520_map) |
77 | |
78 | static struct mtd_info *mymtd; |
79 | |
80 | static int __init init_netsc520(void) |
81 | { |
82 | printk(KERN_NOTICE "NetSc520 flash device: 0x%Lx at 0x%Lx\n" , |
83 | (unsigned long long)netsc520_map.size, |
84 | (unsigned long long)netsc520_map.phys); |
85 | netsc520_map.virt = ioremap(offset: netsc520_map.phys, size: netsc520_map.size); |
86 | |
87 | if (!netsc520_map.virt) { |
88 | printk("Failed to ioremap\n" ); |
89 | return -EIO; |
90 | } |
91 | |
92 | simple_map_init(&netsc520_map); |
93 | |
94 | mymtd = do_map_probe(name: "cfi_probe" , map: &netsc520_map); |
95 | if(!mymtd) |
96 | mymtd = do_map_probe(name: "map_ram" , map: &netsc520_map); |
97 | if(!mymtd) |
98 | mymtd = do_map_probe(name: "map_rom" , map: &netsc520_map); |
99 | |
100 | if (!mymtd) { |
101 | iounmap(addr: netsc520_map.virt); |
102 | return -ENXIO; |
103 | } |
104 | |
105 | mymtd->owner = THIS_MODULE; |
106 | mtd_device_register(mymtd, partition_info, NUM_PARTITIONS); |
107 | return 0; |
108 | } |
109 | |
110 | static void __exit cleanup_netsc520(void) |
111 | { |
112 | if (mymtd) { |
113 | mtd_device_unregister(master: mymtd); |
114 | map_destroy(mtd: mymtd); |
115 | } |
116 | if (netsc520_map.virt) { |
117 | iounmap(addr: netsc520_map.virt); |
118 | netsc520_map.virt = NULL; |
119 | } |
120 | } |
121 | |
122 | module_init(init_netsc520); |
123 | module_exit(cleanup_netsc520); |
124 | |
125 | MODULE_LICENSE("GPL" ); |
126 | MODULE_AUTHOR("Mark Langsdorf <mark.langsdorf@amd.com>" ); |
127 | MODULE_DESCRIPTION("MTD map driver for AMD NetSc520 Demonstration Board" ); |
128 | |