drivers/net/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  */
  37 struct 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 */
  51 static 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  */
  62 static 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                         memset(s[i].name, 0, sizeof(s[i].name));
  71                         strscpy(s[i].name, name, IFNAMSIZ);
  72                         memcpy(&s[i].map, map, sizeof(s[i].map));
  73                         break;
  74                 }
  75         }
  76
  77         return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
  78 }
  79
  80 /**
  81  * netdev_boot_setup_check      - check boot time settings
  82  * @dev: the netdevice
  83  *
  84  * Check boot time settings for the device.
  85  * The found settings are set for the device to be used
  86  * later in the device probing.
  87  * Returns 0 if no settings found, 1 if they are.
  88  */
  89 int netdev_boot_setup_check(struct net_device *dev)
  90 {
  91         struct netdev_boot_setup *s = dev_boot_setup;
  92         int i;
  93
  94         for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
  95                 if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
  96                     !strcmp(dev->name, s[i].name)) {
  97                         dev->irq = s[i].map.irq;
  98                         dev->base_addr = s[i].map.base_addr;
  99                         dev->mem_start = s[i].map.mem_start;
 100                         dev->mem_end = s[i].map.mem_end;
 101                         return 1;
 102                 }
 103         }
 104         return 0;
 105 }
 106 EXPORT_SYMBOL(netdev_boot_setup_check);
 107
 108 /**
 109  * netdev_boot_base     - get address from boot time settings
 110  * @prefix: prefix for network device
 111  * @unit: id for network device
 112  *
 113  * Check boot time settings for the base address of device.
 114  * The found settings are set for the device to be used
 115  * later in the device probing.
 116  * Returns 0 if no settings found.
 117  */
 118 static unsigned long netdev_boot_base(const char *prefix, int unit)
 119 {
 120         const struct netdev_boot_setup *s = dev_boot_setup;
 121         char name[IFNAMSIZ];
 122         int i;
 123
 124         sprintf(name, "%s%d", prefix, unit);
 125
 126         /*
 127          * If device already registered then return base of 1
 128          * to indicate not to probe for this interface
 129          */
 130         if (__dev_get_by_name(&init_net, name))
 131                 return 1;
 132
 133         for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
 134                 if (!strcmp(name, s[i].name))
 135                         return s[i].map.base_addr;
 136         return 0;
 137 }
 138
 139 /*
 140  * Saves at boot time configured settings for any netdevice.
 141  */
 142 static int __init netdev_boot_setup(char *str)
 143 {
 144         int ints[5];
 145         struct ifmap map;
 146
 147         str = get_options(str, ARRAY_SIZE(ints), ints);
 148         if (!str || !*str)
 149                 return 0;
 150
 151         /* Save settings */
 152         memset(&map, 0, sizeof(map));
 153         if (ints[0] > 0)
 154                 map.irq = ints[1];
 155         if (ints[0] > 1)
 156                 map.base_addr = ints[2];
 157         if (ints[0] > 2)
 158                 map.mem_start = ints[3];
 159         if (ints[0] > 3)
 160                 map.mem_end = ints[4];
 161
 162         /* Add new entry to the list */
 163         return netdev_boot_setup_add(str, &map);
 164 }
 165
 166 __setup("netdev=", netdev_boot_setup);
 167
 168 static int __init ether_boot_setup(char *str)
 169 {
 170         return netdev_boot_setup(str);
 171 }
 172 __setup("ether=", ether_boot_setup);
 173
 174
 175 /* A unified ethernet device probe.  This is the easiest way to have every
 176  * ethernet adaptor have the name "eth[0123...]".
 177  */
 178
 179 struct devprobe2 {
 180         struct net_device *(*probe)(int unit);
 181         int status;     /* non-zero if autoprobe has failed */
 182 };
 183
 184 static int __init probe_list2(int unit, struct devprobe2 *p, int autoprobe)
 185 {
 186         struct net_device *dev;
 187
 188         for (; p->probe; p++) {
 189                 if (autoprobe && p->status)
 190                         continue;
 191                 dev = p->probe(unit);
 192                 if (!IS_ERR(dev))
 193                         return 0;
 194                 if (autoprobe)
 195                         p->status = PTR_ERR(dev);
 196         }
 197         return -ENODEV;
 198 }
 199
 200 /* ISA probes that touch addresses < 0x400 (including those that also
 201  * look for EISA/PCI cards in addition to ISA cards).
 202  */
 203 static struct devprobe2 isa_probes[] __initdata = {
 204 #ifdef CONFIG_3C515
 205         {tc515_probe, 0},
 206 #endif
 207 #ifdef CONFIG_ULTRA
 208         {ultra_probe, 0},
 209 #endif
 210 #ifdef CONFIG_WD80x3
 211         {wd_probe, 0},
 212 #endif
 213 #if defined(CONFIG_NE2000) /* ISA (use ne2k-pci for PCI cards) */
 214         {ne_probe, 0},
 215 #endif
 216 #ifdef CONFIG_LANCE             /* ISA/VLB (use pcnet32 for PCI cards) */
 217         {lance_probe, 0},
 218 #endif
 219 #ifdef CONFIG_SMC9194
 220         {smc_init, 0},
 221 #endif
 222 #ifdef CONFIG_CS89x0_ISA
 223         {cs89x0_probe, 0},
 224 #endif
 225         {NULL, 0},
 226 };
 227
 228 /* Unified ethernet device probe, segmented per architecture and
 229  * per bus interface. This drives the legacy devices only for now.
 230  */
 231
 232 static void __init ethif_probe2(int unit)
 233 {
 234         unsigned long base_addr = netdev_boot_base("eth", unit);
 235
 236         if (base_addr == 1)
 237                 return;
 238
 239         probe_list2(unit, isa_probes, base_addr == 0);
 240 }
 241
 242 /*  Statically configured drivers -- order matters here. */
 243 static int __init net_olddevs_init(void)
 244 {
 245         int num;
 246
 247         for (num = 0; num < 8; ++num)
 248                 ethif_probe2(num);
 249
 250         return 0;
 251 }
 252
 253 device_initcall(net_olddevs_init);