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
init_netsc520(void)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(netsc520_map.phys, 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("cfi_probe", &netsc520_map);
95 if(!mymtd)
96 mymtd = do_map_probe("map_ram", &netsc520_map);
97 if(!mymtd)
98 mymtd = do_map_probe("map_rom", &netsc520_map);
99
100 if (!mymtd) {
101 iounmap(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
cleanup_netsc520(void)110 static void __exit cleanup_netsc520(void)
111 {
112 if (mymtd) {
113 mtd_device_unregister(mymtd);
114 map_destroy(mymtd);
115 }
116 if (netsc520_map.virt) {
117 iounmap(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