1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /* netsc520.c -- MTD map driver for AMD NetSc520 Demonstration Board
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * Copyright (C) 2001 Mark Langsdorf (mark.langsdorf@amd.com)
5*4882a593Smuzhiyun * based on sc520cdp.c by Sysgo Real-Time Solutions GmbH
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * The NetSc520 is a demonstration board for the Elan Sc520 processor available
8*4882a593Smuzhiyun * from AMD. It has a single back of 16 megs of 32-bit Flash ROM and another
9*4882a593Smuzhiyun * 16 megs of SDRAM.
10*4882a593Smuzhiyun */
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun #include <linux/module.h>
13*4882a593Smuzhiyun #include <linux/types.h>
14*4882a593Smuzhiyun #include <linux/kernel.h>
15*4882a593Smuzhiyun #include <linux/init.h>
16*4882a593Smuzhiyun #include <asm/io.h>
17*4882a593Smuzhiyun #include <linux/mtd/mtd.h>
18*4882a593Smuzhiyun #include <linux/mtd/map.h>
19*4882a593Smuzhiyun #include <linux/mtd/partitions.h>
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun /*
23*4882a593Smuzhiyun ** The single, 16 megabyte flash bank is divided into four virtual
24*4882a593Smuzhiyun ** partitions. The first partition is 768 KiB and is intended to
25*4882a593Smuzhiyun ** store the kernel image loaded by the bootstrap loader. The second
26*4882a593Smuzhiyun ** partition is 256 KiB and holds the BIOS image. The third
27*4882a593Smuzhiyun ** partition is 14.5 MiB and is intended for the flash file system
28*4882a593Smuzhiyun ** image. The last partition is 512 KiB and contains another copy
29*4882a593Smuzhiyun ** of the BIOS image and the reset vector.
30*4882a593Smuzhiyun **
31*4882a593Smuzhiyun ** Only the third partition should be mounted. The first partition
32*4882a593Smuzhiyun ** should not be mounted, but it can erased and written to using the
33*4882a593Smuzhiyun ** MTD character routines. The second and fourth partitions should
34*4882a593Smuzhiyun ** not be touched - it is possible to corrupt the BIOS image by
35*4882a593Smuzhiyun ** mounting these partitions, and potentially the board will not be
36*4882a593Smuzhiyun ** recoverable afterwards.
37*4882a593Smuzhiyun */
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun /* partition_info gives details on the logical partitions that the split the
40*4882a593Smuzhiyun * single flash device into. If the size if zero we use up to the end of the
41*4882a593Smuzhiyun * device. */
42*4882a593Smuzhiyun static const struct mtd_partition partition_info[] = {
43*4882a593Smuzhiyun {
44*4882a593Smuzhiyun .name = "NetSc520 boot kernel",
45*4882a593Smuzhiyun .offset = 0,
46*4882a593Smuzhiyun .size = 0xc0000
47*4882a593Smuzhiyun },
48*4882a593Smuzhiyun {
49*4882a593Smuzhiyun .name = "NetSc520 Low BIOS",
50*4882a593Smuzhiyun .offset = 0xc0000,
51*4882a593Smuzhiyun .size = 0x40000
52*4882a593Smuzhiyun },
53*4882a593Smuzhiyun {
54*4882a593Smuzhiyun .name = "NetSc520 file system",
55*4882a593Smuzhiyun .offset = 0x100000,
56*4882a593Smuzhiyun .size = 0xe80000
57*4882a593Smuzhiyun },
58*4882a593Smuzhiyun {
59*4882a593Smuzhiyun .name = "NetSc520 High BIOS",
60*4882a593Smuzhiyun .offset = 0xf80000,
61*4882a593Smuzhiyun .size = 0x80000
62*4882a593Smuzhiyun },
63*4882a593Smuzhiyun };
64*4882a593Smuzhiyun #define NUM_PARTITIONS ARRAY_SIZE(partition_info)
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun #define WINDOW_SIZE 0x00100000
67*4882a593Smuzhiyun #define WINDOW_ADDR 0x00200000
68*4882a593Smuzhiyun
69*4882a593Smuzhiyun static struct map_info netsc520_map = {
70*4882a593Smuzhiyun .name = "netsc520 Flash Bank",
71*4882a593Smuzhiyun .size = WINDOW_SIZE,
72*4882a593Smuzhiyun .bankwidth = 4,
73*4882a593Smuzhiyun .phys = WINDOW_ADDR,
74*4882a593Smuzhiyun };
75*4882a593Smuzhiyun
76*4882a593Smuzhiyun #define NUM_FLASH_BANKS ARRAY_SIZE(netsc520_map)
77*4882a593Smuzhiyun
78*4882a593Smuzhiyun static struct mtd_info *mymtd;
79*4882a593Smuzhiyun
init_netsc520(void)80*4882a593Smuzhiyun static int __init init_netsc520(void)
81*4882a593Smuzhiyun {
82*4882a593Smuzhiyun printk(KERN_NOTICE "NetSc520 flash device: 0x%Lx at 0x%Lx\n",
83*4882a593Smuzhiyun (unsigned long long)netsc520_map.size,
84*4882a593Smuzhiyun (unsigned long long)netsc520_map.phys);
85*4882a593Smuzhiyun netsc520_map.virt = ioremap(netsc520_map.phys, netsc520_map.size);
86*4882a593Smuzhiyun
87*4882a593Smuzhiyun if (!netsc520_map.virt) {
88*4882a593Smuzhiyun printk("Failed to ioremap\n");
89*4882a593Smuzhiyun return -EIO;
90*4882a593Smuzhiyun }
91*4882a593Smuzhiyun
92*4882a593Smuzhiyun simple_map_init(&netsc520_map);
93*4882a593Smuzhiyun
94*4882a593Smuzhiyun mymtd = do_map_probe("cfi_probe", &netsc520_map);
95*4882a593Smuzhiyun if(!mymtd)
96*4882a593Smuzhiyun mymtd = do_map_probe("map_ram", &netsc520_map);
97*4882a593Smuzhiyun if(!mymtd)
98*4882a593Smuzhiyun mymtd = do_map_probe("map_rom", &netsc520_map);
99*4882a593Smuzhiyun
100*4882a593Smuzhiyun if (!mymtd) {
101*4882a593Smuzhiyun iounmap(netsc520_map.virt);
102*4882a593Smuzhiyun return -ENXIO;
103*4882a593Smuzhiyun }
104*4882a593Smuzhiyun
105*4882a593Smuzhiyun mymtd->owner = THIS_MODULE;
106*4882a593Smuzhiyun mtd_device_register(mymtd, partition_info, NUM_PARTITIONS);
107*4882a593Smuzhiyun return 0;
108*4882a593Smuzhiyun }
109*4882a593Smuzhiyun
cleanup_netsc520(void)110*4882a593Smuzhiyun static void __exit cleanup_netsc520(void)
111*4882a593Smuzhiyun {
112*4882a593Smuzhiyun if (mymtd) {
113*4882a593Smuzhiyun mtd_device_unregister(mymtd);
114*4882a593Smuzhiyun map_destroy(mymtd);
115*4882a593Smuzhiyun }
116*4882a593Smuzhiyun if (netsc520_map.virt) {
117*4882a593Smuzhiyun iounmap(netsc520_map.virt);
118*4882a593Smuzhiyun netsc520_map.virt = NULL;
119*4882a593Smuzhiyun }
120*4882a593Smuzhiyun }
121*4882a593Smuzhiyun
122*4882a593Smuzhiyun module_init(init_netsc520);
123*4882a593Smuzhiyun module_exit(cleanup_netsc520);
124*4882a593Smuzhiyun
125*4882a593Smuzhiyun MODULE_LICENSE("GPL");
126*4882a593Smuzhiyun MODULE_AUTHOR("Mark Langsdorf <mark.langsdorf@amd.com>");
127*4882a593Smuzhiyun MODULE_DESCRIPTION("MTD map driver for AMD NetSc520 Demonstration Board");
128