1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * INET An implementation of the TCP/IP protocol suite for the LINUX
4 * operating system. INET is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
6 *
7 * Holds initial configuration information for devices.
8 *
9 * Version: @(#)Space.c 1.0.7 08/12/93
10 *
11 * Authors: Ross Biro
12 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
13 * Donald J. Becker, <becker@scyld.com>
14 *
15 * Changelog:
16 * Stephen Hemminger (09/2003)
17 * - get rid of pre-linked dev list, dynamic device allocation
18 * Paul Gortmaker (03/2002)
19 * - struct init cleanup, enable multiple ISA autoprobes.
20 * Arnaldo Carvalho de Melo <acme@conectiva.com.br> - 09/1999
21 * - fix sbni: s/device/net_device/
22 * Paul Gortmaker (06/98):
23 * - sort probes in a sane way, make sure all (safe) probes
24 * get run once & failed autoprobes don't autoprobe again.
25 */
26#include <linux/netdevice.h>
27#include <linux/etherdevice.h>
28#include <linux/errno.h>
29#include <linux/init.h>
30#include <linux/netlink.h>
31#include <net/Space.h>
32
33/*
34 * This structure holds boot-time configured netdevice settings. They
35 * are then used in the device probing.
36 */
37struct netdev_boot_setup {
38 char name[IFNAMSIZ];
39 struct ifmap map;
40};
41#define NETDEV_BOOT_SETUP_MAX 8
42
43
44/******************************************************************************
45 *
46 * Device Boot-time Settings Routines
47 *
48 ******************************************************************************/
49
50/* Boot time configuration table */
51static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
52
53/**
54 * netdev_boot_setup_add - add new setup entry
55 * @name: name of the device
56 * @map: configured settings for the device
57 *
58 * Adds new setup entry to the dev_boot_setup list. The function
59 * returns 0 on error and 1 on success. This is a generic routine to
60 * all netdevices.
61 */
62static int netdev_boot_setup_add(char *name, struct ifmap *map)
63{
64 struct netdev_boot_setup *s;
65 int i;
66
67 s = dev_boot_setup;
68 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
69 if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
70 strscpy_pad(s[i].name, name);
71 memcpy(&s[i].map, map, sizeof(s[i].map));
72 break;
73 }
74 }
75
76 return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
77}
78
79/**
80 * netdev_boot_setup_check - check boot time settings
81 * @dev: the netdevice
82 *
83 * Check boot time settings for the device.
84 * The found settings are set for the device to be used
85 * later in the device probing.
86 * Returns 0 if no settings found, 1 if they are.
87 */
88int netdev_boot_setup_check(struct net_device *dev)
89{
90 struct netdev_boot_setup *s = dev_boot_setup;
91 int i;
92
93 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
94 if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
95 !strcmp(dev->name, s[i].name)) {
96 dev->irq = s[i].map.irq;
97 dev->base_addr = s[i].map.base_addr;
98 dev->mem_start = s[i].map.mem_start;
99 dev->mem_end = s[i].map.mem_end;
100 return 1;
101 }
102 }
103 return 0;
104}
105EXPORT_SYMBOL(netdev_boot_setup_check);
106
107/**
108 * netdev_boot_base - get address from boot time settings
109 * @prefix: prefix for network device
110 * @unit: id for network device
111 *
112 * Check boot time settings for the base address of device.
113 * The found settings are set for the device to be used
114 * later in the device probing.
115 * Returns 0 if no settings found.
116 */
117static unsigned long netdev_boot_base(const char *prefix, int unit)
118{
119 const struct netdev_boot_setup *s = dev_boot_setup;
120 char name[IFNAMSIZ];
121 int i;
122
123 sprintf(buf: name, fmt: "%s%d", prefix, unit);
124
125 /*
126 * If device already registered then return base of 1
127 * to indicate not to probe for this interface
128 */
129 if (__dev_get_by_name(net: &init_net, name))
130 return 1;
131
132 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
133 if (!strcmp(name, s[i].name))
134 return s[i].map.base_addr;
135 return 0;
136}
137
138/*
139 * Saves at boot time configured settings for any netdevice.
140 */
141static int __init netdev_boot_setup(char *str)
142{
143 int ints[5];
144 struct ifmap map;
145
146 str = get_options(str, ARRAY_SIZE(ints), ints);
147 if (!str || !*str)
148 return 0;
149
150 /* Save settings */
151 memset(&map, 0, sizeof(map));
152 if (ints[0] > 0)
153 map.irq = ints[1];
154 if (ints[0] > 1)
155 map.base_addr = ints[2];
156 if (ints[0] > 2)
157 map.mem_start = ints[3];
158 if (ints[0] > 3)
159 map.mem_end = ints[4];
160
161 /* Add new entry to the list */
162 return netdev_boot_setup_add(name: str, map: &map);
163}
164
165__setup("netdev=", netdev_boot_setup);
166
167static int __init ether_boot_setup(char *str)
168{
169 return netdev_boot_setup(str);
170}
171__setup("ether=", ether_boot_setup);
172
173
174/* A unified ethernet device probe. This is the easiest way to have every
175 * ethernet adaptor have the name "eth[0123...]".
176 */
177
178struct devprobe2 {
179 struct net_device *(*probe)(int unit);
180 int status; /* non-zero if autoprobe has failed */
181};
182
183static int __init probe_list2(int unit, struct devprobe2 *p, int autoprobe)
184{
185 struct net_device *dev;
186
187 for (; p->probe; p++) {
188 if (autoprobe && p->status)
189 continue;
190 dev = p->probe(unit);
191 if (!IS_ERR(ptr: dev))
192 return 0;
193 if (autoprobe)
194 p->status = PTR_ERR(ptr: dev);
195 }
196 return -ENODEV;
197}
198
199/* ISA probes that touch addresses < 0x400 (including those that also
200 * look for EISA/PCI cards in addition to ISA cards).
201 */
202static struct devprobe2 isa_probes[] __initdata = {
203#ifdef CONFIG_3C515
204 {tc515_probe, 0},
205#endif
206#ifdef CONFIG_ULTRA
207 {ultra_probe, 0},
208#endif
209#ifdef CONFIG_WD80x3
210 {wd_probe, 0},
211#endif
212#if defined(CONFIG_NE2000) /* ISA (use ne2k-pci for PCI cards) */
213 {ne_probe, 0},
214#endif
215#ifdef CONFIG_LANCE /* ISA/VLB (use pcnet32 for PCI cards) */
216 {lance_probe, 0},
217#endif
218#ifdef CONFIG_SMC9194
219 {smc_init, 0},
220#endif
221#ifdef CONFIG_CS89x0_ISA
222 {cs89x0_probe, 0},
223#endif
224 {NULL, 0},
225};
226
227/* Unified ethernet device probe, segmented per architecture and
228 * per bus interface. This drives the legacy devices only for now.
229 */
230
231static void __init ethif_probe2(int unit)
232{
233 unsigned long base_addr = netdev_boot_base(prefix: "eth", unit);
234
235 if (base_addr == 1)
236 return;
237
238 probe_list2(unit, p: isa_probes, autoprobe: base_addr == 0);
239}
240
241/* Statically configured drivers -- order matters here. */
242static int __init net_olddevs_init(void)
243{
244 int num;
245
246 for (num = 0; num < 8; ++num)
247 ethif_probe2(unit: num);
248
249 return 0;
250}
251
252device_initcall(net_olddevs_init);
253

source code of linux/drivers/net/Space.c