drivers/net/hp-plus.c

   1 /* hp-plus.c: A HP PCLAN/plus ethernet driver for linux. */
   2 /*
   3         Written 1994 by Donald Becker.
   4
   5         This driver is for the Hewlett Packard PC LAN (27***) plus ethercards.
   6         These cards are sold under several model numbers, usually 2724*.
   7
   8         This software may be used and distributed according to the terms
   9         of the GNU General Public License, incorporated herein by reference.
  10
  11         The author may be reached as becker@scyld.com, or C/O
  12         Scyld Computing Corporation
  13         410 Severn Ave., Suite 210
  14         Annapolis MD 21403
  15
  16         As is often the case, a great deal of credit is owed to Russ Nelson.
  17         The Crynwr packet driver was my primary source of HP-specific
  18         programming information.
  19 */
  20
  21 static const char version[] =
  22 "hp-plus.c:v1.10 9/24/94 Donald Becker (becker@cesdis.gsfc.nasa.gov)\n";
  23
  24 #include <linux/module.h>
  25
  26 #include <linux/string.h>               /* Important -- this inlines word moves. */
  27 #include <linux/kernel.h>
  28 #include <linux/errno.h>
  29 #include <linux/ioport.h>
  30 #include <linux/netdevice.h>
  31 #include <linux/etherdevice.h>
  32 #include <linux/init.h>
  33 #include <linux/delay.h>
  34
  35 #include <asm/system.h>
  36 #include <asm/io.h>
  37
  38 #include "8390.h"
  39
  40 #define DRV_NAME "hp-plus"
  41
  42 /* A zero-terminated list of I/O addresses to be probed. */
  43 static unsigned int hpplus_portlist[] __initdata =
  44 {0x200, 0x240, 0x280, 0x2C0, 0x300, 0x320, 0x340, 0};
  45
  46 /*
  47    The HP EtherTwist chip implementation is a fairly routine DP8390
  48    implementation.  It allows both shared memory and programmed-I/O buffer
  49    access, using a custom interface for both.  The programmed-I/O mode is
  50    entirely implemented in the HP EtherTwist chip, bypassing the problem
  51    ridden built-in 8390 facilities used on NE2000 designs.  The shared
  52    memory mode is likewise special, with an offset register used to make
  53    packets appear at the shared memory base.  Both modes use a base and bounds
  54    page register to hide the Rx ring buffer wrap -- a packet that spans the
  55    end of physical buffer memory appears continuous to the driver. (c.f. the
  56    3c503 and Cabletron E2100)
  57
  58    A special note: the internal buffer of the board is only 8 bits wide.
  59    This lays several nasty traps for the unaware:
  60    - the 8390 must be programmed for byte-wide operations
  61    - all I/O and memory operations must work on whole words (the access
  62      latches are serially preloaded and have no byte-swapping ability).
  63
  64    This board is laid out in I/O space much like the earlier HP boards:
  65    the first 16 locations are for the board registers, and the second 16 are
  66    for the 8390.  The board is easy to identify, with both a dedicated 16 bit
  67    ID register and a constant 0x530* value in the upper bits of the paging
  68    register.
  69 */
  70
  71 #define HP_ID                   0x00    /* ID register, always 0x4850. */
  72 #define HP_PAGING               0x02    /* Registers visible @ 8-f, see PageName. */
  73 #define HPP_OPTION              0x04    /* Bitmapped options, see HP_Option.    */
  74 #define HPP_OUT_ADDR    0x08    /* I/O output location in Perf_Page.    */
  75 #define HPP_IN_ADDR             0x0A    /* I/O input location in Perf_Page.             */
  76 #define HP_DATAPORT             0x0c    /* I/O data transfer in Perf_Page.              */
  77 #define NIC_OFFSET              0x10    /* Offset to the 8390 registers.                */
  78 #define HP_IO_EXTENT    32
  79
  80 #define HP_START_PG             0x00    /* First page of TX buffer */
  81 #define HP_STOP_PG              0x80    /* Last page +1 of RX ring */
  82
  83 /* The register set selected in HP_PAGING. */
  84 enum PageName {
  85         Perf_Page = 0,                          /* Normal operation. */
  86         MAC_Page = 1,                           /* The ethernet address (+checksum). */
  87         HW_Page = 2,                            /* EEPROM-loaded hardware parameters. */
  88         LAN_Page = 4,                           /* Transceiver selection, testing, etc. */
  89         ID_Page = 6 };
  90
  91 /* The bit definitions for the HPP_OPTION register. */
  92 enum HP_Option {
  93         NICReset = 1, ChipReset = 2,    /* Active low, really UNreset. */
  94         EnableIRQ = 4, FakeIntr = 8, BootROMEnb = 0x10, IOEnb = 0x20,
  95         MemEnable = 0x40, ZeroWait = 0x80, MemDisable = 0x1000, };
  96
  97 static int hpp_probe1(struct net_device *dev, int ioaddr);
  98
  99 static void hpp_reset_8390(struct net_device *dev);
 100 static int hpp_open(struct net_device *dev);
 101 static int hpp_close(struct net_device *dev);
 102 static void hpp_mem_block_input(struct net_device *dev, int count,
 103                                                   struct sk_buff *skb, int ring_offset);
 104 static void hpp_mem_block_output(struct net_device *dev, int count,
 105                                                         const unsigned char *buf, int start_page);
 106 static void hpp_mem_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr,
 107                                                   int ring_page);
 108 static void hpp_io_block_input(struct net_device *dev, int count,
 109                                                   struct sk_buff *skb, int ring_offset);
 110 static void hpp_io_block_output(struct net_device *dev, int count,
 111                                                         const unsigned char *buf, int start_page);
 112 static void hpp_io_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr,
 113                                                   int ring_page);
 114
 115
 116 /*      Probe a list of addresses for an HP LAN+ adaptor.
 117         This routine is almost boilerplate. */
 118
 119 static int __init do_hpp_probe(struct net_device *dev)
 120 {
 121         int i;
 122         int base_addr = dev->base_addr;
 123         int irq = dev->irq;
 124
 125         if (base_addr > 0x1ff)          /* Check a single specified location. */
 126                 return hpp_probe1(dev, base_addr);
 127         else if (base_addr != 0)        /* Don't probe at all. */
 128                 return -ENXIO;
 129
 130         for (i = 0; hpplus_portlist[i]; i++) {
 131                 if (hpp_probe1(dev, hpplus_portlist[i]) == 0)
 132                         return 0;
 133                 dev->irq = irq;
 134         }
 135
 136         return -ENODEV;
 137 }
 138
 139 #ifndef MODULE
 140 struct net_device * __init hp_plus_probe(int unit)
 141 {
 142         struct net_device *dev = alloc_eip_netdev();
 143         int err;
 144
 145         if (!dev)
 146                 return ERR_PTR(-ENOMEM);
 147
 148         sprintf(dev->name, "eth%d", unit);
 149         netdev_boot_setup_check(dev);
 150
 151         err = do_hpp_probe(dev);
 152         if (err)
 153                 goto out;
 154         return dev;
 155 out:
 156         free_netdev(dev);
 157         return ERR_PTR(err);
 158 }
 159 #endif
 160
 161 /* Do the interesting part of the probe at a single address. */
 162 static int __init hpp_probe1(struct net_device *dev, int ioaddr)
 163 {
 164         int i, retval;
 165         unsigned char checksum = 0;
 166         const char name[] = "HP-PC-LAN+";
 167         int mem_start;
 168         static unsigned version_printed;
 169
 170         if (!request_region(ioaddr, HP_IO_EXTENT, DRV_NAME))
 171                 return -EBUSY;
 172
 173         /* Check for the HP+ signature, 50 48 0x 53. */
 174         if (inw(ioaddr + HP_ID) != 0x4850
 175                 || (inw(ioaddr + HP_PAGING) & 0xfff0) != 0x5300) {
 176                 retval = -ENODEV;
 177                 goto out;
 178         }
 179
 180         if (ei_debug  &&  version_printed++ == 0)
 181                 printk(version);
 182
 183         printk("%s: %s at %#3x, ", dev->name, name, ioaddr);
 184
 185         /* Retrieve and checksum the station address. */
 186         outw(MAC_Page, ioaddr + HP_PAGING);
 187
 188         for(i = 0; i < ETHER_ADDR_LEN; i++) {
 189                 unsigned char inval = inb(ioaddr + 8 + i);
 190                 dev->dev_addr[i] = inval;
 191                 checksum += inval;
 192         }
 193         checksum += inb(ioaddr + 14);
 194
 195         printk("%pM", dev->dev_addr);
 196
 197         if (checksum != 0xff) {
 198                 printk(" bad checksum %2.2x.\n", checksum);
 199                 retval = -ENODEV;
 200                 goto out;
 201         } else {
 202                 /* Point at the Software Configuration Flags. */
 203                 outw(ID_Page, ioaddr + HP_PAGING);
 204                 printk(" ID %4.4x", inw(ioaddr + 12));
 205         }
 206
 207         /* Read the IRQ line. */
 208         outw(HW_Page, ioaddr + HP_PAGING);
 209         {
 210                 int irq = inb(ioaddr + 13) & 0x0f;
 211                 int option = inw(ioaddr + HPP_OPTION);
 212
 213                 dev->irq = irq;
 214                 if (option & MemEnable) {
 215                         mem_start = inw(ioaddr + 9) << 8;
 216                         printk(", IRQ %d, memory address %#x.\n", irq, mem_start);
 217                 } else {
 218                         mem_start = 0;
 219                         printk(", IRQ %d, programmed-I/O mode.\n", irq);
 220                 }
 221         }
 222
 223         /* Set the wrap registers for string I/O reads.   */
 224         outw((HP_START_PG + TX_PAGES/2) | ((HP_STOP_PG - 1) << 8), ioaddr + 14);
 225
 226         /* Set the base address to point to the NIC, not the "real" base! */
 227         dev->base_addr = ioaddr + NIC_OFFSET;
 228
 229         dev->open = &hpp_open;
 230         dev->stop = &hpp_close;
 231 #ifdef CONFIG_NET_POLL_CONTROLLER
 232         dev->poll_controller = ei_poll;
 233 #endif
 234
 235         ei_status.name = name;
 236         ei_status.word16 = 0;           /* Agggghhhhh! Debug time: 2 days! */
 237         ei_status.tx_start_page = HP_START_PG;
 238         ei_status.rx_start_page = HP_START_PG + TX_PAGES/2;
 239         ei_status.stop_page = HP_STOP_PG;
 240
 241         ei_status.reset_8390 = &hpp_reset_8390;
 242         ei_status.block_input = &hpp_io_block_input;
 243         ei_status.block_output = &hpp_io_block_output;
 244         ei_status.get_8390_hdr = &hpp_io_get_8390_hdr;
 245
 246         /* Check if the memory_enable flag is set in the option register. */
 247         if (mem_start) {
 248                 ei_status.block_input = &hpp_mem_block_input;
 249                 ei_status.block_output = &hpp_mem_block_output;
 250                 ei_status.get_8390_hdr = &hpp_mem_get_8390_hdr;
 251                 dev->mem_start = mem_start;
 252                 ei_status.mem = ioremap(mem_start,
 253                                         (HP_STOP_PG - HP_START_PG)*256);
 254                 if (!ei_status.mem) {
 255                         retval = -ENOMEM;
 256                         goto out;
 257                 }
 258                 ei_status.rmem_start = dev->mem_start + TX_PAGES/2*256;
 259                 dev->mem_end = ei_status.rmem_end
 260                         = dev->mem_start + (HP_STOP_PG - HP_START_PG)*256;
 261         }
 262
 263         outw(Perf_Page, ioaddr + HP_PAGING);
 264         NS8390p_init(dev, 0);
 265         /* Leave the 8390 and HP chip reset. */
 266         outw(inw(ioaddr + HPP_OPTION) & ~EnableIRQ, ioaddr + HPP_OPTION);
 267
 268         retval = register_netdev(dev);
 269         if (retval)
 270                 goto out1;
 271         return 0;
 272 out1:
 273         iounmap(ei_status.mem);
 274 out:
 275         release_region(ioaddr, HP_IO_EXTENT);
 276         return retval;
 277 }
 278
 279 static int
 280 hpp_open(struct net_device *dev)
 281 {
 282         int ioaddr = dev->base_addr - NIC_OFFSET;
 283         int option_reg;
 284         int retval;
 285
 286         if ((retval = request_irq(dev->irq, eip_interrupt, 0, dev->name, dev))) {
 287             return retval;
 288         }
 289
 290         /* Reset the 8390 and HP chip. */
 291         option_reg = inw(ioaddr + HPP_OPTION);
 292         outw(option_reg & ~(NICReset + ChipReset), ioaddr + HPP_OPTION);
 293         udelay(5);
 294         /* Unreset the board and enable interrupts. */
 295         outw(option_reg | (EnableIRQ + NICReset + ChipReset), ioaddr + HPP_OPTION);
 296
 297         /* Set the wrap registers for programmed-I/O operation.   */
 298         outw(HW_Page, ioaddr + HP_PAGING);
 299         outw((HP_START_PG + TX_PAGES/2) | ((HP_STOP_PG - 1) << 8), ioaddr + 14);
 300
 301         /* Select the operational page. */
 302         outw(Perf_Page, ioaddr + HP_PAGING);
 303
 304         eip_open(dev);
 305         return 0;
 306 }
 307
 308 static int
 309 hpp_close(struct net_device *dev)
 310 {
 311         int ioaddr = dev->base_addr - NIC_OFFSET;
 312         int option_reg = inw(ioaddr + HPP_OPTION);
 313
 314         free_irq(dev->irq, dev);
 315         eip_close(dev);
 316         outw((option_reg & ~EnableIRQ) | MemDisable | NICReset | ChipReset,
 317                  ioaddr + HPP_OPTION);
 318
 319         return 0;
 320 }
 321
 322 static void
 323 hpp_reset_8390(struct net_device *dev)
 324 {
 325         int ioaddr = dev->base_addr - NIC_OFFSET;
 326         int option_reg = inw(ioaddr + HPP_OPTION);
 327
 328         if (ei_debug > 1) printk("resetting the 8390 time=%ld...", jiffies);
 329
 330         outw(option_reg & ~(NICReset + ChipReset), ioaddr + HPP_OPTION);
 331         /* Pause a few cycles for the hardware reset to take place. */
 332         udelay(5);
 333         ei_status.txing = 0;
 334         outw(option_reg | (EnableIRQ + NICReset + ChipReset), ioaddr + HPP_OPTION);
 335
 336         udelay(5);
 337
 338
 339         if ((inb_p(ioaddr+NIC_OFFSET+EN0_ISR) & ENISR_RESET) == 0)
 340                 printk("%s: hp_reset_8390() did not complete.\n", dev->name);
 341
 342         if (ei_debug > 1) printk("8390 reset done (%ld).", jiffies);
 343         return;
 344 }
 345
 346 /* The programmed-I/O version of reading the 4 byte 8390 specific header.
 347    Note that transfer with the EtherTwist+ must be on word boundaries. */
 348
 349 static void
 350 hpp_io_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr, int ring_page)
 351 {
 352         int ioaddr = dev->base_addr - NIC_OFFSET;
 353
 354         outw((ring_page<<8), ioaddr + HPP_IN_ADDR);
 355         insw(ioaddr + HP_DATAPORT, hdr, sizeof(struct e8390_pkt_hdr)>>1);
 356 }
 357
 358 /* Block input and output, similar to the Crynwr packet driver. */
 359
 360 static void
 361 hpp_io_block_input(struct net_device *dev, int count, struct sk_buff *skb, int ring_offset)
 362 {
 363         int ioaddr = dev->base_addr - NIC_OFFSET;
 364         char *buf = skb->data;
 365
 366         outw(ring_offset, ioaddr + HPP_IN_ADDR);
 367         insw(ioaddr + HP_DATAPORT, buf, count>>1);
 368         if (count & 0x01)
 369         buf[count-1] = inw(ioaddr + HP_DATAPORT);
 370 }
 371
 372 /* The corresponding shared memory versions of the above 2 functions. */
 373
 374 static void
 375 hpp_mem_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr, int ring_page)
 376 {
 377         int ioaddr = dev->base_addr - NIC_OFFSET;
 378         int option_reg = inw(ioaddr + HPP_OPTION);
 379
 380         outw((ring_page<<8), ioaddr + HPP_IN_ADDR);
 381         outw(option_reg & ~(MemDisable + BootROMEnb), ioaddr + HPP_OPTION);
 382         memcpy_fromio(hdr, ei_status.mem, sizeof(struct e8390_pkt_hdr));
 383         outw(option_reg, ioaddr + HPP_OPTION);
 384         hdr->count = (le16_to_cpu(hdr->count) + 3) & ~3;        /* Round up allocation. */
 385 }
 386
 387 static void
 388 hpp_mem_block_input(struct net_device *dev, int count, struct sk_buff *skb, int ring_offset)
 389 {
 390         int ioaddr = dev->base_addr - NIC_OFFSET;
 391         int option_reg = inw(ioaddr + HPP_OPTION);
 392
 393         outw(ring_offset, ioaddr + HPP_IN_ADDR);
 394
 395         outw(option_reg & ~(MemDisable + BootROMEnb), ioaddr + HPP_OPTION);
 396
 397         /* Caution: this relies on get_8390_hdr() rounding up count!
 398            Also note that we *can't* use eth_io_copy_and_sum() because
 399            it will not always copy "count" bytes (e.g. padded IP).  */
 400
 401         memcpy_fromio(skb->data, ei_status.mem, count);
 402         outw(option_reg, ioaddr + HPP_OPTION);
 403 }
 404
 405 /* A special note: we *must* always transfer >=16 bit words.
 406    It's always safe to round up, so we do. */
 407 static void
 408 hpp_io_block_output(struct net_device *dev, int count,
 409                                         const unsigned char *buf, int start_page)
 410 {
 411         int ioaddr = dev->base_addr - NIC_OFFSET;
 412         outw(start_page << 8, ioaddr + HPP_OUT_ADDR);
 413         outsl(ioaddr + HP_DATAPORT, buf, (count+3)>>2);
 414         return;
 415 }
 416
 417 static void
 418 hpp_mem_block_output(struct net_device *dev, int count,
 419                                 const unsigned char *buf, int start_page)
 420 {
 421         int ioaddr = dev->base_addr - NIC_OFFSET;
 422         int option_reg = inw(ioaddr + HPP_OPTION);
 423
 424         outw(start_page << 8, ioaddr + HPP_OUT_ADDR);
 425         outw(option_reg & ~(MemDisable + BootROMEnb), ioaddr + HPP_OPTION);
 426         memcpy_toio(ei_status.mem, buf, (count + 3) & ~3);
 427         outw(option_reg, ioaddr + HPP_OPTION);
 428
 429         return;
 430 }
 431
 432
 433 #ifdef MODULE
 434 #define MAX_HPP_CARDS   4       /* Max number of HPP cards per module */
 435 static struct net_device *dev_hpp[MAX_HPP_CARDS];
 436 static int io[MAX_HPP_CARDS];
 437 static int irq[MAX_HPP_CARDS];
 438
 439 module_param_array(io, int, NULL, 0);
 440 module_param_array(irq, int, NULL, 0);
 441 MODULE_PARM_DESC(io, "I/O port address(es)");
 442 MODULE_PARM_DESC(irq, "IRQ number(s); ignored if properly detected");
 443 MODULE_DESCRIPTION("HP PC-LAN+ ISA ethernet driver");
 444 MODULE_LICENSE("GPL");
 445
 446 /* This is set up so that only a single autoprobe takes place per call.
 447 ISA device autoprobes on a running machine are not recommended. */
 448 int __init
 449 init_module(void)
 450 {
 451         struct net_device *dev;
 452         int this_dev, found = 0;
 453
 454         for (this_dev = 0; this_dev < MAX_HPP_CARDS; this_dev++) {
 455                 if (io[this_dev] == 0)  {
 456                         if (this_dev != 0) break; /* only autoprobe 1st one */
 457                         printk(KERN_NOTICE "hp-plus.c: Presently autoprobing (not recommended) for a single card.\n");
 458                 }
 459                 dev = alloc_ei_netdev();
 460                 if (!dev)
 461                         break;
 462                 dev->irq = irq[this_dev];
 463                 dev->base_addr = io[this_dev];
 464                 if (do_hpp_probe(dev) == 0) {
 465                         dev_hpp[found++] = dev;
 466                         continue;
 467                 }
 468                 free_netdev(dev);
 469                 printk(KERN_WARNING "hp-plus.c: No HP-Plus card found (i/o = 0x%x).\n", io[this_dev]);
 470                 break;
 471         }
 472         if (found)
 473                 return 0;
 474         return -ENXIO;
 475 }
 476
 477 static void cleanup_card(struct net_device *dev)
 478 {
 479         /* NB: hpp_close() handles free_irq */
 480         iounmap(ei_status.mem);
 481         release_region(dev->base_addr - NIC_OFFSET, HP_IO_EXTENT);
 482 }
 483
 484 void __exit
 485 cleanup_module(void)
 486 {
 487         int this_dev;
 488
 489         for (this_dev = 0; this_dev < MAX_HPP_CARDS; this_dev++) {
 490                 struct net_device *dev = dev_hpp[this_dev];
 491                 if (dev) {
 492                         unregister_netdev(dev);
 493                         cleanup_card(dev);
 494                         free_netdev(dev);
 495                 }
 496         }
 497 }
 498 #endif /* MODULE */