drivers/net/e2100.c

   1 /* e2100.c: A Cabletron E2100 series ethernet driver for linux. */
   2 /*
   3         Written 1993-1994 by Donald Becker.
   4
   5         Copyright 1994 by Donald Becker.
   6         Copyright 1993 United States Government as represented by the
   7         Director, National Security Agency.  This software may be used and
   8         distributed according to the terms of the GNU General Public License,
   9         incorporated herein by reference.
  10
  11         This is a driver for the Cabletron E2100 series ethercards.
  12
  13         The Author may be reached as becker@scyld.com, or C/O
  14         Scyld Computing Corporation
  15         410 Severn Ave., Suite 210
  16         Annapolis MD 21403
  17
  18         The E2100 series ethercard is a fairly generic shared memory 8390
  19         implementation.  The only unusual aspect is the way the shared memory
  20         registers are set: first you do an inb() in what is normally the
  21         station address region, and the low three bits of next outb() *address*
  22         is used as the write value for that register.  Either someone wasn't
  23         too used to dem bit en bites, or they were trying to obfuscate the
  24         programming interface.
  25
  26         There is an additional complication when setting the window on the packet
  27         buffer.  You must first do a read into the packet buffer region with the
  28         low 8 address bits the address setting the page for the start of the packet
  29         buffer window, and then do the above operation.  See mem_on() for details.
  30
  31         One bug on the chip is that even a hard reset won't disable the memory
  32         window, usually resulting in a hung machine if mem_off() isn't called.
  33         If this happens, you must power down the machine for about 30 seconds.
  34 */
  35
  36 static const char version[] =
  37         "e2100.c:v1.01 7/21/94 Donald Becker (becker@cesdis.gsfc.nasa.gov)\n";
  38
  39 #include <linux/module.h>
  40 #include <linux/kernel.h>
  41 #include <linux/errno.h>
  42 #include <linux/string.h>
  43 #include <linux/ioport.h>
  44 #include <linux/netdevice.h>
  45 #include <linux/etherdevice.h>
  46 #include <linux/init.h>
  47 #include <linux/delay.h>
  48
  49 #include <asm/io.h>
  50 #include <asm/system.h>
  51
  52 #include "8390.h"
  53
  54 #define DRV_NAME "e2100"
  55
  56 static int e21_probe_list[] = {0x300, 0x280, 0x380, 0x220, 0};
  57
  58 /* Offsets from the base_addr.
  59    Read from the ASIC register, and the low three bits of the next outb()
  60    address is used to set the corresponding register. */
  61 #define E21_NIC_OFFSET  0               /* Offset to the 8390 NIC. */
  62 #define E21_ASIC                0x10
  63 #define E21_MEM_ENABLE  0x10
  64 #define  E21_MEM_ON             0x05    /* Enable memory in 16 bit mode. */
  65 #define  E21_MEM_ON_8   0x07    /* Enable memory in  8 bit mode. */
  66 #define E21_MEM_BASE    0x11
  67 #define E21_IRQ_LOW             0x12    /* The low three bits of the IRQ number. */
  68 #define E21_IRQ_HIGH    0x14    /* The high IRQ bit and media select ...  */
  69 #define E21_MEDIA               0x14    /* (alias). */
  70 #define  E21_ALT_IFPORT 0x02    /* Set to use the other (BNC,AUI) port. */
  71 #define  E21_BIG_MEM    0x04    /* Use a bigger (64K) buffer (we don't) */
  72 #define E21_SAPROM              0x10    /* Offset to station address data. */
  73 #define E21_IO_EXTENT    0x20
  74
  75 static inline void mem_on(short port, volatile char __iomem *mem_base,
  76                                                   unsigned char start_page )
  77 {
  78         /* This is a little weird: set the shared memory window by doing a
  79            read.  The low address bits specify the starting page. */
  80         readb(mem_base+start_page);
  81         inb(port + E21_MEM_ENABLE);
  82         outb(E21_MEM_ON, port + E21_MEM_ENABLE + E21_MEM_ON);
  83 }
  84
  85 static inline void mem_off(short port)
  86 {
  87         inb(port + E21_MEM_ENABLE);
  88         outb(0x00, port + E21_MEM_ENABLE);
  89 }
  90
  91 /* In other drivers I put the TX pages first, but the E2100 window circuitry
  92    is designed to have a 4K Tx region last. The windowing circuitry wraps the
  93    window at 0x2fff->0x0000 so that the packets at e.g. 0x2f00 in the RX ring
  94    appear contiguously in the window. */
  95 #define E21_RX_START_PG         0x00    /* First page of RX buffer */
  96 #define E21_RX_STOP_PG          0x30    /* Last page +1 of RX ring */
  97 #define E21_BIG_RX_STOP_PG      0xF0    /* Last page +1 of RX ring */
  98 #define E21_TX_START_PG         E21_RX_STOP_PG  /* First page of TX buffer */
  99
 100 static int e21_probe1(struct net_device *dev, int ioaddr);
 101
 102 static int e21_open(struct net_device *dev);
 103 static void e21_reset_8390(struct net_device *dev);
 104 static void e21_block_input(struct net_device *dev, int count,
 105                                                    struct sk_buff *skb, int ring_offset);
 106 static void e21_block_output(struct net_device *dev, int count,
 107                                                          const unsigned char *buf, int start_page);
 108 static void e21_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr,
 109                                                         int ring_page);
 110
 111 static int e21_close(struct net_device *dev);
 112
 113
 114 /*  Probe for the E2100 series ethercards.  These cards have an 8390 at the
 115         base address and the station address at both offset 0x10 and 0x18.  I read
 116         the station address from offset 0x18 to avoid the dataport of NE2000
 117         ethercards, and look for Ctron's unique ID (first three octets of the
 118         station address).
 119  */
 120
 121 static int  __init do_e2100_probe(struct net_device *dev)
 122 {
 123         int *port;
 124         int base_addr = dev->base_addr;
 125         int irq = dev->irq;
 126
 127         if (base_addr > 0x1ff)          /* Check a single specified location. */
 128                 return e21_probe1(dev, base_addr);
 129         else if (base_addr != 0)        /* Don't probe at all. */
 130                 return -ENXIO;
 131
 132         for (port = e21_probe_list; *port; port++) {
 133                 dev->irq = irq;
 134                 if (e21_probe1(dev, *port) == 0)
 135                         return 0;
 136         }
 137
 138         return -ENODEV;
 139 }
 140
 141 #ifndef MODULE
 142 struct net_device * __init e2100_probe(int unit)
 143 {
 144         struct net_device *dev = alloc_ei_netdev();
 145         int err;
 146
 147         if (!dev)
 148                 return ERR_PTR(-ENOMEM);
 149
 150         sprintf(dev->name, "eth%d", unit);
 151         netdev_boot_setup_check(dev);
 152
 153         err = do_e2100_probe(dev);
 154         if (err)
 155                 goto out;
 156         return dev;
 157 out:
 158         free_netdev(dev);
 159         return ERR_PTR(err);
 160 }
 161 #endif
 162
 163 static int __init e21_probe1(struct net_device *dev, int ioaddr)
 164 {
 165         int i, status, retval;
 166         unsigned char *station_addr = dev->dev_addr;
 167         static unsigned version_printed;
 168
 169         if (!request_region(ioaddr, E21_IO_EXTENT, DRV_NAME))
 170                 return -EBUSY;
 171
 172         /* First check the station address for the Ctron prefix. */
 173         if (inb(ioaddr + E21_SAPROM + 0) != 0x00
 174                 || inb(ioaddr + E21_SAPROM + 1) != 0x00
 175                 || inb(ioaddr + E21_SAPROM + 2) != 0x1d) {
 176                 retval = -ENODEV;
 177                 goto out;
 178         }
 179
 180         /* Verify by making certain that there is a 8390 at there. */
 181         outb(E8390_NODMA + E8390_STOP, ioaddr);
 182         udelay(1);      /* we want to delay one I/O cycle - which is 2MHz */
 183         status = inb(ioaddr);
 184         if (status != 0x21 && status != 0x23) {
 185                 retval = -ENODEV;
 186                 goto out;
 187         }
 188
 189         /* Read the station address PROM.  */
 190         for (i = 0; i < 6; i++)
 191                 station_addr[i] = inb(ioaddr + E21_SAPROM + i);
 192
 193         inb(ioaddr + E21_MEDIA);                /* Point to media selection. */
 194         outb(0, ioaddr + E21_ASIC);     /* and disable the secondary interface. */
 195
 196         if (ei_debug  &&  version_printed++ == 0)
 197                 printk(version);
 198
 199         for (i = 0; i < 6; i++)
 200                 printk(" %02X", station_addr[i]);
 201
 202         if (dev->irq < 2) {
 203                 int irqlist[] = {15,11,10,12,5,9,3,4}, i;
 204                 for (i = 0; i < 8; i++)
 205                         if (request_irq (irqlist[i], NULL, 0, "bogus", NULL) != -EBUSY) {
 206                                 dev->irq = irqlist[i];
 207                                 break;
 208                         }
 209                 if (i >= 8) {
 210                         printk(" unable to get IRQ %d.\n", dev->irq);
 211                         retval = -EAGAIN;
 212                         goto out;
 213                 }
 214         } else if (dev->irq == 2)       /* Fixup luser bogosity: IRQ2 is really IRQ9 */
 215                 dev->irq = 9;
 216
 217         /* The 8390 is at the base address. */
 218         dev->base_addr = ioaddr;
 219
 220         ei_status.name = "E2100";
 221         ei_status.word16 = 1;
 222         ei_status.tx_start_page = E21_TX_START_PG;
 223         ei_status.rx_start_page = E21_RX_START_PG;
 224         ei_status.stop_page = E21_RX_STOP_PG;
 225         ei_status.saved_irq = dev->irq;
 226
 227         /* Check the media port used.  The port can be passed in on the
 228            low mem_end bits. */
 229         if (dev->mem_end & 15)
 230                 dev->if_port = dev->mem_end & 7;
 231         else {
 232                 dev->if_port = 0;
 233                 inb(ioaddr + E21_MEDIA);        /* Turn automatic media detection on. */
 234                 for(i = 0; i < 6; i++)
 235                         if (station_addr[i] != inb(ioaddr + E21_SAPROM + 8 + i)) {
 236                                 dev->if_port = 1;
 237                                 break;
 238                         }
 239         }
 240
 241         /* Never map in the E21 shared memory unless you are actively using it.
 242            Also, the shared memory has effective only one setting -- spread all
 243            over the 128K region! */
 244         if (dev->mem_start == 0)
 245                 dev->mem_start = 0xd0000;
 246
 247         ei_status.mem = ioremap(dev->mem_start, 2*1024);
 248         if (!ei_status.mem) {
 249                 printk("unable to remap memory\n");
 250                 retval = -EAGAIN;
 251                 goto out;
 252         }
 253
 254 #ifdef notdef
 255         /* These values are unused.  The E2100 has a 2K window into the packet
 256            buffer.  The window can be set to start on any page boundary. */
 257         ei_status.rmem_start = dev->mem_start + TX_PAGES*256;
 258         dev->mem_end = ei_status.rmem_end = dev->mem_start + 2*1024;
 259 #endif
 260
 261         printk(", IRQ %d, %s media, memory @ %#lx.\n", dev->irq,
 262                    dev->if_port ? "secondary" : "primary", dev->mem_start);
 263
 264         ei_status.reset_8390 = &e21_reset_8390;
 265         ei_status.block_input = &e21_block_input;
 266         ei_status.block_output = &e21_block_output;
 267         ei_status.get_8390_hdr = &e21_get_8390_hdr;
 268         dev->open = &e21_open;
 269         dev->stop = &e21_close;
 270 #ifdef CONFIG_NET_POLL_CONTROLLER
 271         dev->poll_controller = ei_poll;
 272 #endif
 273         NS8390_init(dev, 0);
 274
 275         retval = register_netdev(dev);
 276         if (retval)
 277                 goto out;
 278         return 0;
 279 out:
 280         release_region(ioaddr, E21_IO_EXTENT);
 281         return retval;
 282 }
 283
 284 static int
 285 e21_open(struct net_device *dev)
 286 {
 287         short ioaddr = dev->base_addr;
 288         int retval;
 289
 290         if ((retval = request_irq(dev->irq, ei_interrupt, 0, dev->name, dev)))
 291                 return retval;
 292
 293         /* Set the interrupt line and memory base on the hardware. */
 294         inb(ioaddr + E21_IRQ_LOW);
 295         outb(0, ioaddr + E21_ASIC + (dev->irq & 7));
 296         inb(ioaddr + E21_IRQ_HIGH);                     /* High IRQ bit, and if_port. */
 297         outb(0, ioaddr + E21_ASIC + (dev->irq > 7 ? 1:0)
 298                    + (dev->if_port ? E21_ALT_IFPORT : 0));
 299         inb(ioaddr + E21_MEM_BASE);
 300         outb(0, ioaddr + E21_ASIC + ((dev->mem_start >> 17) & 7));
 301
 302         ei_open(dev);
 303         return 0;
 304 }
 305
 306 static void
 307 e21_reset_8390(struct net_device *dev)
 308 {
 309         short ioaddr = dev->base_addr;
 310
 311         outb(0x01, ioaddr);
 312         if (ei_debug > 1) printk("resetting the E2180x3 t=%ld...", jiffies);
 313         ei_status.txing = 0;
 314
 315         /* Set up the ASIC registers, just in case something changed them. */
 316
 317         if (ei_debug > 1) printk("reset done\n");
 318         return;
 319 }
 320
 321 /* Grab the 8390 specific header. We put the 2k window so the header page
 322    appears at the start of the shared memory. */
 323
 324 static void
 325 e21_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr, int ring_page)
 326 {
 327
 328         short ioaddr = dev->base_addr;
 329         char __iomem *shared_mem = ei_status.mem;
 330
 331         mem_on(ioaddr, shared_mem, ring_page);
 332
 333 #ifdef notdef
 334         /* Officially this is what we are doing, but the readl() is faster */
 335         memcpy_fromio(hdr, shared_mem, sizeof(struct e8390_pkt_hdr));
 336 #else
 337         ((unsigned int*)hdr)[0] = readl(shared_mem);
 338 #endif
 339
 340         /* Turn off memory access: we would need to reprogram the window anyway. */
 341         mem_off(ioaddr);
 342
 343 }
 344
 345 /*  Block input and output are easy on shared memory ethercards.
 346         The E21xx makes block_input() especially easy by wrapping the top
 347         ring buffer to the bottom automatically. */
 348 static void
 349 e21_block_input(struct net_device *dev, int count, struct sk_buff *skb, int ring_offset)
 350 {
 351         short ioaddr = dev->base_addr;
 352         char __iomem *shared_mem = ei_status.mem;
 353
 354         mem_on(ioaddr, shared_mem, (ring_offset>>8));
 355
 356         memcpy_fromio(skb->data, ei_status.mem + (ring_offset & 0xff), count);
 357
 358         mem_off(ioaddr);
 359 }
 360
 361 static void
 362 e21_block_output(struct net_device *dev, int count, const unsigned char *buf,
 363                                  int start_page)
 364 {
 365         short ioaddr = dev->base_addr;
 366         volatile char __iomem *shared_mem = ei_status.mem;
 367
 368         /* Set the shared memory window start by doing a read, with the low address
 369            bits specifying the starting page. */
 370         readb(shared_mem + start_page);
 371         mem_on(ioaddr, shared_mem, start_page);
 372
 373         memcpy_toio(shared_mem, buf, count);
 374         mem_off(ioaddr);
 375 }
 376
 377 static int
 378 e21_close(struct net_device *dev)
 379 {
 380         short ioaddr = dev->base_addr;
 381
 382         if (ei_debug > 1)
 383                 printk("%s: Shutting down ethercard.\n", dev->name);
 384
 385         free_irq(dev->irq, dev);
 386         dev->irq = ei_status.saved_irq;
 387
 388         /* Shut off the interrupt line and secondary interface. */
 389         inb(ioaddr + E21_IRQ_LOW);
 390         outb(0, ioaddr + E21_ASIC);
 391         inb(ioaddr + E21_IRQ_HIGH);                     /* High IRQ bit, and if_port. */
 392         outb(0, ioaddr + E21_ASIC);
 393
 394         ei_close(dev);
 395
 396         /* Double-check that the memory has been turned off, because really
 397            really bad things happen if it isn't. */
 398         mem_off(ioaddr);
 399
 400         return 0;
 401 }
 402
 403
 404 #ifdef MODULE
 405 #define MAX_E21_CARDS   4       /* Max number of E21 cards per module */
 406 static struct net_device *dev_e21[MAX_E21_CARDS];
 407 static int io[MAX_E21_CARDS];
 408 static int irq[MAX_E21_CARDS];
 409 static int mem[MAX_E21_CARDS];
 410 static int xcvr[MAX_E21_CARDS];         /* choose int. or ext. xcvr */
 411
 412 module_param_array(io, int, NULL, 0);
 413 module_param_array(irq, int, NULL, 0);
 414 module_param_array(mem, int, NULL, 0);
 415 module_param_array(xcvr, int, NULL, 0);
 416 MODULE_PARM_DESC(io, "I/O base address(es)");
 417 MODULE_PARM_DESC(irq, "IRQ number(s)");
 418 MODULE_PARM_DESC(mem, " memory base address(es)");
 419 MODULE_PARM_DESC(xcvr, "transceiver(s) (0=internal, 1=external)");
 420 MODULE_DESCRIPTION("Cabletron E2100 ISA ethernet driver");
 421 MODULE_LICENSE("GPL");
 422
 423 /* This is set up so that only a single autoprobe takes place per call.
 424 ISA device autoprobes on a running machine are not recommended. */
 425
 426 int __init init_module(void)
 427 {
 428         struct net_device *dev;
 429         int this_dev, found = 0;
 430
 431         for (this_dev = 0; this_dev < MAX_E21_CARDS; this_dev++) {
 432                 if (io[this_dev] == 0)  {
 433                         if (this_dev != 0) break; /* only autoprobe 1st one */
 434                         printk(KERN_NOTICE "e2100.c: Presently autoprobing (not recommended) for a single card.\n");
 435                 }
 436                 dev = alloc_ei_netdev();
 437                 if (!dev)
 438                         break;
 439                 dev->irq = irq[this_dev];
 440                 dev->base_addr = io[this_dev];
 441                 dev->mem_start = mem[this_dev];
 442                 dev->mem_end = xcvr[this_dev];  /* low 4bits = xcvr sel. */
 443                 if (do_e2100_probe(dev) == 0) {
 444                         dev_e21[found++] = dev;
 445                         continue;
 446                 }
 447                 free_netdev(dev);
 448                 printk(KERN_WARNING "e2100.c: No E2100 card found (i/o = 0x%x).\n", io[this_dev]);
 449                 break;
 450         }
 451         if (found)
 452                 return 0;
 453         return -ENXIO;
 454 }
 455
 456 static void cleanup_card(struct net_device *dev)
 457 {
 458         /* NB: e21_close() handles free_irq */
 459         iounmap(ei_status.mem);
 460         release_region(dev->base_addr, E21_IO_EXTENT);
 461 }
 462
 463 void __exit
 464 cleanup_module(void)
 465 {
 466         int this_dev;
 467
 468         for (this_dev = 0; this_dev < MAX_E21_CARDS; this_dev++) {
 469                 struct net_device *dev = dev_e21[this_dev];
 470                 if (dev) {
 471                         unregister_netdev(dev);
 472                         cleanup_card(dev);
 473                         free_netdev(dev);
 474                 }
 475         }
 476 }
 477 #endif /* MODULE */