Space.c

  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(name, "%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(&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(str, &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(dev))
192			return 0;
193		if (autoprobe)
194			p->status = PTR_ERR(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("eth", unit);
234
235	if (base_addr == 1)
236		return;
237
238	probe_list2(unit, isa_probes, 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(num);
248
249	return 0;
250}
251
252device_initcall(net_olddevs_init);