drivers/net/arcnet/com20020.c

   1 /*
   2  * Linux ARCnet driver - COM20020 chipset support
   3  *
   4  * Written 1997 by David Woodhouse.
   5  * Written 1994-1999 by Avery Pennarun.
   6  * Written 1999 by Martin Mares <mj@ucw.cz>.
   7  * Derived from skeleton.c by Donald Becker.
   8  *
   9  * Special thanks to Contemporary Controls, Inc. (www.ccontrols.com)
  10  *  for sponsoring the further development of this driver.
  11  *
  12  * **********************
  13  *
  14  * The original copyright of skeleton.c was as follows:
  15  *
  16  * skeleton.c Written 1993 by Donald Becker.
  17  * Copyright 1993 United States Government as represented by the
  18  * Director, National Security Agency.  This software may only be used
  19  * and distributed according to the terms of the GNU General Public License as
  20  * modified by SRC, incorporated herein by reference.
  21  *
  22  * **********************
  23  *
  24  * For more details, see drivers/net/arcnet.c
  25  *
  26  * **********************
  27  */
  28
  29 #define pr_fmt(fmt) "arcnet:" KBUILD_MODNAME ": " fmt
  30
  31 #include <linux/module.h>
  32 #include <linux/kernel.h>
  33 #include <linux/types.h>
  34 #include <linux/ioport.h>
  35 #include <linux/errno.h>
  36 #include <linux/delay.h>
  37 #include <linux/netdevice.h>
  38 #include <linux/init.h>
  39 #include <linux/interrupt.h>
  40 #include <linux/io.h>
  41
  42 #include "arcdevice.h"
  43 #include "com20020.h"
  44
  45 static const char * const clockrates[] = {
  46         "XXXXXXX", "XXXXXXXX", "XXXXXX", "2.5 Mb/s",
  47         "1.25Mb/s", "625 Kb/s", "312.5 Kb/s", "156.25 Kb/s",
  48         "Reserved", "Reserved", "Reserved"
  49 };
  50
  51 static void com20020_command(struct net_device *dev, int command);
  52 static int com20020_status(struct net_device *dev);
  53 static void com20020_setmask(struct net_device *dev, int mask);
  54 static int com20020_reset(struct net_device *dev, int really_reset);
  55 static void com20020_copy_to_card(struct net_device *dev, int bufnum,
  56                                   int offset, void *buf, int count);
  57 static void com20020_copy_from_card(struct net_device *dev, int bufnum,
  58                                     int offset, void *buf, int count);
  59 static void com20020_set_mc_list(struct net_device *dev);
  60 static void com20020_close(struct net_device *);
  61
  62 static void com20020_copy_from_card(struct net_device *dev, int bufnum,
  63                                     int offset, void *buf, int count)
  64 {
  65         int ioaddr = dev->base_addr, ofs = 512 * bufnum + offset;
  66
  67         /* set up the address register */
  68         arcnet_outb((ofs >> 8) | RDDATAflag | AUTOINCflag,
  69                     ioaddr, COM20020_REG_W_ADDR_HI);
  70         arcnet_outb(ofs & 0xff, ioaddr, COM20020_REG_W_ADDR_LO);
  71
  72         /* copy the data */
  73         TIME(dev, "insb", count,
  74              arcnet_insb(ioaddr, COM20020_REG_RW_MEMDATA, buf, count));
  75 }
  76
  77 static void com20020_copy_to_card(struct net_device *dev, int bufnum,
  78                                   int offset, void *buf, int count)
  79 {
  80         int ioaddr = dev->base_addr, ofs = 512 * bufnum + offset;
  81
  82         /* set up the address register */
  83         arcnet_outb((ofs >> 8) | AUTOINCflag, ioaddr, COM20020_REG_W_ADDR_HI);
  84         arcnet_outb(ofs & 0xff, ioaddr, COM20020_REG_W_ADDR_LO);
  85
  86         /* copy the data */
  87         TIME(dev, "outsb", count,
  88              arcnet_outsb(ioaddr, COM20020_REG_RW_MEMDATA, buf, count));
  89 }
  90
  91 /* Reset the card and check some basic stuff during the detection stage. */
  92 int com20020_check(struct net_device *dev)
  93 {
  94         int ioaddr = dev->base_addr, status;
  95         struct arcnet_local *lp = netdev_priv(dev);
  96
  97         arcnet_outb(XTOcfg(3) | RESETcfg, ioaddr, COM20020_REG_W_CONFIG);
  98         udelay(5);
  99         arcnet_outb(XTOcfg(3), ioaddr, COM20020_REG_W_CONFIG);
 100         mdelay(RESETtime);
 101
 102         lp->setup = lp->clockm ? 0 : (lp->clockp << 1);
 103         lp->setup2 = (lp->clockm << 4) | 8;
 104
 105         /* CHECK: should we do this for SOHARD cards ? */
 106         /* Enable P1Mode for backplane mode */
 107         lp->setup = lp->setup | P1MODE;
 108
 109         com20020_set_subaddress(lp, ioaddr, SUB_SETUP1);
 110         arcnet_outb(lp->setup, ioaddr, COM20020_REG_W_XREG);
 111
 112         if (lp->clockm != 0) {
 113                 com20020_set_subaddress(lp, ioaddr, SUB_SETUP2);
 114                 arcnet_outb(lp->setup2, ioaddr, COM20020_REG_W_XREG);
 115
 116                 /* must now write the magic "restart operation" command */
 117                 mdelay(1);
 118                 arcnet_outb(STARTIOcmd, ioaddr, COM20020_REG_W_COMMAND);
 119         }
 120
 121         lp->config = (lp->timeout << 3) | (lp->backplane << 2) | SUB_NODE;
 122         /* set node ID to 0x42 (but transmitter is disabled, so it's okay) */
 123         arcnet_outb(lp->config, ioaddr, COM20020_REG_W_CONFIG);
 124         arcnet_outb(0x42, ioaddr, COM20020_REG_W_XREG);
 125
 126         status = arcnet_inb(ioaddr, COM20020_REG_R_STATUS);
 127
 128         if ((status & 0x99) != (NORXflag | TXFREEflag | RESETflag)) {
 129                 arc_printk(D_NORMAL, dev, "status invalid (%Xh).\n", status);
 130                 return -ENODEV;
 131         }
 132         arc_printk(D_INIT_REASONS, dev, "status after reset: %X\n", status);
 133
 134         arcnet_outb(CFLAGScmd | RESETclear | CONFIGclear,
 135                     ioaddr, COM20020_REG_W_COMMAND);
 136         status = arcnet_inb(ioaddr, COM20020_REG_R_STATUS);
 137         arc_printk(D_INIT_REASONS, dev, "status after reset acknowledged: %X\n",
 138                    status);
 139
 140         /* Read first location of memory */
 141         arcnet_outb(0 | RDDATAflag | AUTOINCflag,
 142                     ioaddr, COM20020_REG_W_ADDR_HI);
 143         arcnet_outb(0, ioaddr, COM20020_REG_W_ADDR_LO);
 144
 145         status = arcnet_inb(ioaddr, COM20020_REG_RW_MEMDATA);
 146         if (status != TESTvalue) {
 147                 arc_printk(D_NORMAL, dev, "Signature byte not found (%02Xh != D1h).\n",
 148                            status);
 149                 return -ENODEV;
 150         }
 151         return 0;
 152 }
 153
 154 static int com20020_set_hwaddr(struct net_device *dev, void *addr)
 155 {
 156         int ioaddr = dev->base_addr;
 157         struct arcnet_local *lp = netdev_priv(dev);
 158         struct sockaddr *hwaddr = addr;
 159
 160         memcpy(dev->dev_addr, hwaddr->sa_data, 1);
 161         com20020_set_subaddress(lp, ioaddr, SUB_NODE);
 162         arcnet_outb(dev->dev_addr[0], ioaddr, COM20020_REG_W_XREG);
 163
 164         return 0;
 165 }
 166
 167 static int com20020_netdev_open(struct net_device *dev)
 168 {
 169         int ioaddr = dev->base_addr;
 170         struct arcnet_local *lp = netdev_priv(dev);
 171
 172         lp->config |= TXENcfg;
 173         arcnet_outb(lp->config, ioaddr, COM20020_REG_W_CONFIG);
 174
 175         return arcnet_open(dev);
 176 }
 177
 178 static int com20020_netdev_close(struct net_device *dev)
 179 {
 180         int ioaddr = dev->base_addr;
 181         struct arcnet_local *lp = netdev_priv(dev);
 182
 183         arcnet_close(dev);
 184
 185         /* disable transmitter */
 186         lp->config &= ~TXENcfg;
 187         arcnet_outb(lp->config, ioaddr, COM20020_REG_W_CONFIG);
 188         return 0;
 189 }
 190
 191 const struct net_device_ops com20020_netdev_ops = {
 192         .ndo_open       = com20020_netdev_open,
 193         .ndo_stop       = com20020_netdev_close,
 194         .ndo_start_xmit = arcnet_send_packet,
 195         .ndo_tx_timeout = arcnet_timeout,
 196         .ndo_set_mac_address = com20020_set_hwaddr,
 197         .ndo_set_rx_mode = com20020_set_mc_list,
 198 };
 199
 200 /* Set up the struct net_device associated with this card.  Called after
 201  * probing succeeds.
 202  */
 203 int com20020_found(struct net_device *dev, int shared)
 204 {
 205         struct arcnet_local *lp;
 206         int ioaddr = dev->base_addr;
 207
 208         /* Initialize the rest of the device structure. */
 209
 210         lp = netdev_priv(dev);
 211
 212         lp->hw.owner = THIS_MODULE;
 213         lp->hw.command = com20020_command;
 214         lp->hw.status = com20020_status;
 215         lp->hw.intmask = com20020_setmask;
 216         lp->hw.reset = com20020_reset;
 217         lp->hw.copy_to_card = com20020_copy_to_card;
 218         lp->hw.copy_from_card = com20020_copy_from_card;
 219         lp->hw.close = com20020_close;
 220
 221         /* FIXME: do this some other way! */
 222         if (!dev->dev_addr[0])
 223                 dev->dev_addr[0] = arcnet_inb(ioaddr, 8);
 224
 225         com20020_set_subaddress(lp, ioaddr, SUB_SETUP1);
 226         arcnet_outb(lp->setup, ioaddr, COM20020_REG_W_XREG);
 227
 228         if (lp->card_flags & ARC_CAN_10MBIT) {
 229                 com20020_set_subaddress(lp, ioaddr, SUB_SETUP2);
 230                 arcnet_outb(lp->setup2, ioaddr, COM20020_REG_W_XREG);
 231
 232                 /* must now write the magic "restart operation" command */
 233                 mdelay(1);
 234                 arcnet_outb(STARTIOcmd, ioaddr, COM20020_REG_W_COMMAND);
 235         }
 236
 237         lp->config = (lp->timeout << 3) | (lp->backplane << 2) | SUB_NODE;
 238         /* Default 0x38 + register: Node ID */
 239         arcnet_outb(lp->config, ioaddr, COM20020_REG_W_CONFIG);
 240         arcnet_outb(dev->dev_addr[0], ioaddr, COM20020_REG_W_XREG);
 241
 242         /* reserve the irq */
 243         if (request_irq(dev->irq, arcnet_interrupt, shared,
 244                         "arcnet (COM20020)", dev)) {
 245                 arc_printk(D_NORMAL, dev, "Can't get IRQ %d!\n", dev->irq);
 246                 return -ENODEV;
 247         }
 248
 249         dev->base_addr = ioaddr;
 250
 251         arc_printk(D_NORMAL, dev, "%s: station %02Xh found at %03lXh, IRQ %d.\n",
 252                    lp->card_name, dev->dev_addr[0], dev->base_addr, dev->irq);
 253
 254         if (lp->backplane)
 255                 arc_printk(D_NORMAL, dev, "Using backplane mode.\n");
 256
 257         if (lp->timeout != 3)
 258                 arc_printk(D_NORMAL, dev, "Using extended timeout value of %d\n",
 259                            lp->timeout);
 260
 261         arc_printk(D_NORMAL, dev, "Using CKP %d - data rate %s\n",
 262                    lp->setup >> 1,
 263                    clockrates[3 -
 264                               ((lp->setup2 & 0xF0) >> 4) +
 265                               ((lp->setup & 0x0F) >> 1)]);
 266                         /* The clockrates array index looks very fragile.
 267                          * It seems like it could have negative indexing.
 268                          */
 269
 270         if (register_netdev(dev)) {
 271                 free_irq(dev->irq, dev);
 272                 return -EIO;
 273         }
 274         return 0;
 275 }
 276
 277 /* Do a hardware reset on the card, and set up necessary registers.
 278  *
 279  * This should be called as little as possible, because it disrupts the
 280  * token on the network (causes a RECON) and requires a significant delay.
 281  *
 282  * However, it does make sure the card is in a defined state.
 283  */
 284 static int com20020_reset(struct net_device *dev, int really_reset)
 285 {
 286         struct arcnet_local *lp = netdev_priv(dev);
 287         u_int ioaddr = dev->base_addr;
 288         u_char inbyte;
 289
 290         arc_printk(D_DEBUG, dev, "%s: %d: %s: dev: %p, lp: %p, dev->name: %s\n",
 291                    __FILE__, __LINE__, __func__, dev, lp, dev->name);
 292         arc_printk(D_INIT, dev, "Resetting %s (status=%02Xh)\n",
 293                    dev->name, arcnet_inb(ioaddr, COM20020_REG_R_STATUS));
 294
 295         arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
 296         lp->config |= (lp->timeout << 3) | (lp->backplane << 2);
 297         /* power-up defaults */
 298         arcnet_outb(lp->config, ioaddr, COM20020_REG_W_CONFIG);
 299         arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
 300
 301         if (really_reset) {
 302                 /* reset the card */
 303                 arcnet_outb(lp->config | RESETcfg, ioaddr, COM20020_REG_W_CONFIG);
 304                 udelay(5);
 305                 arcnet_outb(lp->config, ioaddr, COM20020_REG_W_CONFIG);
 306                 mdelay(RESETtime * 2);
 307                                 /* COM20020 seems to be slower sometimes */
 308         }
 309         /* clear flags & end reset */
 310         arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
 311         arcnet_outb(CFLAGScmd | RESETclear | CONFIGclear,
 312                     ioaddr, COM20020_REG_W_COMMAND);
 313
 314         /* verify that the ARCnet signature byte is present */
 315         arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
 316
 317         com20020_copy_from_card(dev, 0, 0, &inbyte, 1);
 318         arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
 319         if (inbyte != TESTvalue) {
 320                 arc_printk(D_DEBUG, dev, "%s: %d: %s\n",
 321                            __FILE__, __LINE__, __func__);
 322                 arc_printk(D_NORMAL, dev, "reset failed: TESTvalue not present.\n");
 323                 return 1;
 324         }
 325         /* enable extended (512-byte) packets */
 326         arcnet_outb(CONFIGcmd | EXTconf, ioaddr, COM20020_REG_W_COMMAND);
 327
 328         arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
 329
 330         /* done!  return success. */
 331         return 0;
 332 }
 333
 334 static void com20020_setmask(struct net_device *dev, int mask)
 335 {
 336         u_int ioaddr = dev->base_addr;
 337
 338         arc_printk(D_DURING, dev, "Setting mask to %x at %x\n", mask, ioaddr);
 339         arcnet_outb(mask, ioaddr, COM20020_REG_W_INTMASK);
 340 }
 341
 342 static void com20020_command(struct net_device *dev, int cmd)
 343 {
 344         u_int ioaddr = dev->base_addr;
 345
 346         arcnet_outb(cmd, ioaddr, COM20020_REG_W_COMMAND);
 347 }
 348
 349 static int com20020_status(struct net_device *dev)
 350 {
 351         u_int ioaddr = dev->base_addr;
 352
 353         return arcnet_inb(ioaddr, COM20020_REG_R_STATUS) +
 354                 (arcnet_inb(ioaddr, COM20020_REG_R_DIAGSTAT) << 8);
 355 }
 356
 357 static void com20020_close(struct net_device *dev)
 358 {
 359         struct arcnet_local *lp = netdev_priv(dev);
 360         int ioaddr = dev->base_addr;
 361
 362         /* disable transmitter */
 363         lp->config &= ~TXENcfg;
 364         arcnet_outb(lp->config, ioaddr, COM20020_REG_W_CONFIG);
 365 }
 366
 367 /* Set or clear the multicast filter for this adaptor.
 368  * num_addrs == -1    Promiscuous mode, receive all packets
 369  * num_addrs == 0       Normal mode, clear multicast list
 370  * num_addrs > 0        Multicast mode, receive normal and MC packets, and do
 371  *                      best-effort filtering.
 372  *      FIXME - do multicast stuff, not just promiscuous.
 373  */
 374 static void com20020_set_mc_list(struct net_device *dev)
 375 {
 376         struct arcnet_local *lp = netdev_priv(dev);
 377         int ioaddr = dev->base_addr;
 378
 379         if ((dev->flags & IFF_PROMISC) && (dev->flags & IFF_UP)) {
 380                 /* Enable promiscuous mode */
 381                 if (!(lp->setup & PROMISCset))
 382                         arc_printk(D_NORMAL, dev, "Setting promiscuous flag...\n");
 383                 com20020_set_subaddress(lp, ioaddr, SUB_SETUP1);
 384                 lp->setup |= PROMISCset;
 385                 arcnet_outb(lp->setup, ioaddr, COM20020_REG_W_XREG);
 386         } else {
 387                 /* Disable promiscuous mode, use normal mode */
 388                 if ((lp->setup & PROMISCset))
 389                         arc_printk(D_NORMAL, dev, "Resetting promiscuous flag...\n");
 390                 com20020_set_subaddress(lp, ioaddr, SUB_SETUP1);
 391                 lp->setup &= ~PROMISCset;
 392                 arcnet_outb(lp->setup, ioaddr, COM20020_REG_W_XREG);
 393         }
 394 }
 395
 396 #if defined(CONFIG_ARCNET_COM20020_PCI_MODULE) || \
 397     defined(CONFIG_ARCNET_COM20020_ISA_MODULE) || \
 398     defined(CONFIG_ARCNET_COM20020_CS_MODULE)
 399 EXPORT_SYMBOL(com20020_check);
 400 EXPORT_SYMBOL(com20020_found);
 401 EXPORT_SYMBOL(com20020_netdev_ops);
 402 #endif
 403
 404 MODULE_LICENSE("GPL");
 405
 406 #ifdef MODULE
 407
 408 static int __init com20020_module_init(void)
 409 {
 410         if (BUGLVL(D_NORMAL))
 411                 pr_info("%s\n", "COM20020 chipset support (by David Woodhouse et al.)");
 412         return 0;
 413 }
 414
 415 static void __exit com20020_module_exit(void)
 416 {
 417 }
 418 module_init(com20020_module_init);
 419 module_exit(com20020_module_exit);
 420 #endif                          /* MODULE */