drivers/net/hp-plus.c

/* */
This source file includes following definitions.
hp_plus_probe
hpp_probe1
hpp_open
hpp_close
hpp_reset_8390
hpp_io_get_8390_hdr
hpp_io_block_input
hpp_mem_get_8390_hdr
hpp_mem_block_input
hpp_io_block_output
hpp_mem_block_output
init_module
cleanup_module
   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 Public License, incorporated herein by reference.
  10 
  11         The author may be reached as becker@CESDIS.gsfc.nasa.gov, or C/O
  12 
  13         Center of Excellence in Space Data and Information Sciences
  14                 Code 930.5, Goddard Space Flight Center, Greenbelt MD 20771
  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/sched.h>
  29 #include <linux/errno.h>
  30 #include <linux/ioport.h>
  31 #include <linux/netdevice.h>
  32 #include <linux/etherdevice.h>
  33 
  34 #include <asm/system.h>
  35 #include <asm/io.h>
  36 
  37 
  38 #include "8390.h"
  39 
  40 /* A zero-terminated list of I/O addresses to be probed. */
  41 static unsigned int hpplus_portlist[] =
  42 {0x200, 0x240, 0x280, 0x2C0, 0x300, 0x320, 0x340, 0};
  43 
  44 /*
  45    The HP EtherTwist chip implementation is a fairly routine DP8390
  46    implementation.  It allows both shared memory and programmed-I/O buffer
  47    access, using a custom interface for both.  The programmed-I/O mode is
  48    entirely implemented in the HP EtherTwist chip, bypassing the problem
  49    ridden built-in 8390 facilities used on NE2000 designs.  The shared
  50    memory mode is likewise special, with an offset register used to make
  51    packets appear at the shared memory base.  Both modes use a base and bounds
  52    page register to hide the Rx ring buffer wrap -- a packet that spans the
  53    end of physical buffer memory appears continuous to the driver. (c.f. the
  54    3c503 and Cabletron E2100)
  55 
  56    A special note: the internal buffer of the board is only 8 bits wide.
  57    This lays several nasty traps for the unaware:
  58    - the 8390 must be programmed for byte-wide operations
  59    - all I/O and memory operations must work on whole words (the access
  60      latches are serially preloaded and have no byte-swapping ability).
  61 
  62    This board is laid out in I/O space much like the earlier HP boards:
  63    the first 16 locations are for the board registers, and the second 16 are
  64    for the 8390.  The board is easy to identify, with both a dedicated 16 bit
  65    ID register and a constant 0x530* value in the upper bits of the paging
  66    register.
  67 */
  68 
  69 #define HP_ID                   0x00    /* ID register, always 0x4850. */
  70 #define HP_PAGING               0x02    /* Registers visible @ 8-f, see PageName. */ 
  71 #define HPP_OPTION              0x04    /* Bitmapped options, see HP_Option.    */
  72 #define HPP_OUT_ADDR    0x08    /* I/O output location in Perf_Page.    */
  73 #define HPP_IN_ADDR             0x0A    /* I/O input location in Perf_Page.             */
  74 #define HP_DATAPORT             0x0c    /* I/O data transfer in Perf_Page.              */
  75 #define NIC_OFFSET              0x10    /* Offset to the 8390 registers.                */
  76 #define HP_IO_EXTENT    32
  77 
  78 #define HP_START_PG             0x00    /* First page of TX buffer */
  79 #define HP_STOP_PG              0x80    /* Last page +1 of RX ring */
  80 
  81 /* The register set selected in HP_PAGING. */
  82 enum PageName {
  83         Perf_Page = 0,                          /* Normal operation. */
  84         MAC_Page = 1,                           /* The ethernet address (+checksum). */
  85         HW_Page = 2,                            /* EEPROM-loaded hardware parameters. */
  86         LAN_Page = 4,                           /* Transceiver selection, testing, etc. */
  87         ID_Page = 6 }; 
  88 
  89 /* The bit definitions for the HPP_OPTION register. */
  90 enum HP_Option {
  91         NICReset = 1, ChipReset = 2,    /* Active low, really UNreset. */
  92         EnableIRQ = 4, FakeIntr = 8, BootROMEnb = 0x10, IOEnb = 0x20,
  93         MemEnable = 0x40, ZeroWait = 0x80, MemDisable = 0x1000, };
  94 
  95 int hp_plus_probe(struct device *dev);
  96 int hpp_probe1(struct device *dev, int ioaddr);
  97 
  98 static void hpp_reset_8390(struct device *dev);
  99 static int hpp_open(struct device *dev);
 100 static int hpp_close(struct device *dev);
 101 static void hpp_mem_block_input(struct device *dev, int count,
 102                                                   struct sk_buff *skb, int ring_offset);
 103 static void hpp_mem_block_output(struct device *dev, int count,
 104                                                         const unsigned char *buf, const start_page);
 105 static void hpp_mem_get_8390_hdr(struct device *dev, struct e8390_pkt_hdr *hdr,
 106                                                   int ring_page);
 107 static void hpp_io_block_input(struct device *dev, int count,
 108                                                   struct sk_buff *skb, int ring_offset);
 109 static void hpp_io_block_output(struct device *dev, int count,
 110                                                         const unsigned char *buf, const start_page);
 111 static void hpp_io_get_8390_hdr(struct device *dev, struct e8390_pkt_hdr *hdr,
 112                                                   int ring_page);
 113 
 114 
 115 /*      Probe a list of addresses for an HP LAN+ adaptor.
 116         This routine is almost boilerplate. */
 117 #ifdef HAVE_DEVLIST
 118 /* Support for a alternate probe manager, which will eliminate the
 119    boilerplate below. */
 120 struct netdev_entry hpplus_drv =
 121 {"hpplus", hpp_probe1, HP_IO_EXTENT, hpplus_portlist};
 122 #else
 123 
 124 int hp_plus_probe(struct device *dev)
     /*  */
 125 {
 126         int i;
 127         int base_addr = dev ? dev->base_addr : 0;
 128 
 129         if (base_addr > 0x1ff)          /* Check a single specified location. */
 130                 return hpp_probe1(dev, base_addr);
 131         else if (base_addr != 0)        /* Don't probe at all. */
 132                 return ENXIO;
 133 
 134         for (i = 0; hpplus_portlist[i]; i++) {
 135                 int ioaddr = hpplus_portlist[i];
 136                 if (check_region(ioaddr, HP_IO_EXTENT))
 137                         continue;
 138                 if (hpp_probe1(dev, ioaddr) == 0)
 139                         return 0;
 140         }
 141 
 142         return ENODEV;
 143 }
 144 #endif
 145 
 146 /* Do the interesting part of the probe at a single address. */
 147 int hpp_probe1(struct device *dev, int ioaddr)
     /*  */
 148 {
 149         int i;
 150         unsigned char checksum = 0;
 151         const char *name = "HP-PC-LAN+";
 152         int mem_start;
 153         static unsigned version_printed = 0;
 154 
 155         /* Check for the HP+ signature, 50 48 0x 53. */
 156         if (inw(ioaddr + HP_ID) != 0x4850
 157                 || (inw(ioaddr + HP_PAGING) & 0xfff0) != 0x5300)
 158                 return ENODEV;
 159 
 160         /* We should have a "dev" from Space.c or the static module table. */
 161         if (dev == NULL) {
 162                 printk("hp-plus.c: Passed a NULL device.\n");
 163                 dev = init_etherdev(0, 0);
 164         }
 165 
 166         if (ei_debug  &&  version_printed++ == 0)
 167                 printk(version);
 168 
 169         printk("%s: %s at %#3x,", dev->name, name, ioaddr);
 170 
 171         /* Retrieve and checksum the station address. */
 172         outw(MAC_Page, ioaddr + HP_PAGING);
 173 
 174         for(i = 0; i < ETHER_ADDR_LEN; i++) {
 175                 unsigned char inval = inb(ioaddr + 8 + i);
 176                 dev->dev_addr[i] = inval;
 177                 checksum += inval;
 178                 printk(" %2.2x", inval);
 179         }
 180         checksum += inb(ioaddr + 14);
 181 
 182         if (checksum != 0xff) {
 183                 printk(" bad checksum %2.2x.\n", checksum);
 184                 return ENODEV;
 185         } else {
 186                 /* Point at the Software Configuration Flags. */
 187                 outw(ID_Page, ioaddr + HP_PAGING);
 188                 printk(" ID %4.4x", inw(ioaddr + 12));
 189         }
 190 
 191         /* Allocate dev->priv and fill in 8390 specific dev fields. */
 192         if (ethdev_init(dev)) {
 193                 printk ("hp-plus.c: unable to allocate memory for dev->priv.\n");
 194                 return -ENOMEM;
 195          }
 196 
 197         /* Grab the region so we can find another board if something fails. */
 198         request_region(ioaddr, HP_IO_EXTENT,"hp-plus");
 199 
 200         /* Read the IRQ line. */
 201         outw(HW_Page, ioaddr + HP_PAGING);
 202         {
 203                 int irq = inb(ioaddr + 13) & 0x0f;
 204                 int option = inw(ioaddr + HPP_OPTION);
 205 
 206                 dev->irq = irq;
 207                 if (option & MemEnable) {
 208                         mem_start = inw(ioaddr + 9) << 8;
 209                         printk(", IRQ %d, memory address %#x.\n", irq, mem_start);
 210                 } else {
 211                         mem_start = 0;
 212                         printk(", IRQ %d, programmed-I/O mode.\n", irq);
 213                 }
 214         }
 215 
 216         /* Set the wrap registers for string I/O reads.   */
 217         outw((HP_START_PG + TX_2X_PAGES) | ((HP_STOP_PG - 1) << 8), ioaddr + 14);
 218 
 219         /* Set the base address to point to the NIC, not the "real" base! */
 220         dev->base_addr = ioaddr + NIC_OFFSET;
 221 
 222         dev->open = &hpp_open;
 223         dev->stop = &hpp_close;
 224 
 225         ei_status.name = name;
 226         ei_status.word16 = 0;           /* Agggghhhhh! Debug time: 2 days! */
 227         ei_status.tx_start_page = HP_START_PG;
 228         ei_status.rx_start_page = HP_START_PG + TX_2X_PAGES;
 229         ei_status.stop_page = HP_STOP_PG;
 230 
 231         ei_status.reset_8390 = &hpp_reset_8390;
 232         ei_status.block_input = &hpp_io_block_input;
 233         ei_status.block_output = &hpp_io_block_output;
 234         ei_status.get_8390_hdr = &hpp_io_get_8390_hdr;
 235 
 236         /* Check if the memory_enable flag is set in the option register. */
 237         if (mem_start) {
 238                 ei_status.block_input = &hpp_mem_block_input;
 239                 ei_status.block_output = &hpp_mem_block_output;
 240                 ei_status.get_8390_hdr = &hpp_mem_get_8390_hdr;
 241                 dev->mem_start = mem_start;
 242                 dev->rmem_start = dev->mem_start + TX_2X_PAGES*256;
 243                 dev->mem_end = dev->rmem_end
 244                         = dev->mem_start + (HP_STOP_PG - HP_START_PG)*256;
 245         }
 246 
 247         outw(Perf_Page, ioaddr + HP_PAGING);
 248         NS8390_init(dev, 0);
 249         /* Leave the 8390 and HP chip reset. */
 250         outw(inw(ioaddr + HPP_OPTION) & ~EnableIRQ, ioaddr + HPP_OPTION);
 251 
 252         return 0;
 253 }
 254 
 255 static int
 256 hpp_open(struct device *dev)
     /*  */
 257 {
 258         int ioaddr = dev->base_addr - NIC_OFFSET;
 259         int option_reg;
 260 
 261         if (request_irq(dev->irq, &ei_interrupt, 0, "hp-plus")) {
 262             return -EAGAIN;
 263         }
 264 
 265         /* Reset the 8390 and HP chip. */
 266         option_reg = inw(ioaddr + HPP_OPTION);
 267         outw(option_reg & ~(NICReset + ChipReset), ioaddr + HPP_OPTION);
 268         SLOW_DOWN_IO; SLOW_DOWN_IO;
 269         /* Unreset the board and enable interrupts. */
 270         outw(option_reg | (EnableIRQ + NICReset + ChipReset), ioaddr + HPP_OPTION);
 271 
 272         /* Set the wrap registers for programmed-I/O operation.   */
 273         outw(HW_Page, ioaddr + HP_PAGING);
 274         outw((HP_START_PG + TX_2X_PAGES) | ((HP_STOP_PG - 1) << 8), ioaddr + 14);
 275 
 276         /* Select the operational page. */
 277         outw(Perf_Page, ioaddr + HP_PAGING);
 278 
 279         ei_open(dev);
 280         MOD_INC_USE_COUNT;
 281         return 0;
 282 }
 283 
 284 static int
 285 hpp_close(struct device *dev)
     /*  */
 286 {
 287         int ioaddr = dev->base_addr - NIC_OFFSET;
 288         int option_reg = inw(ioaddr + HPP_OPTION);
 289 
 290         free_irq(dev->irq);
 291         irq2dev_map[dev->irq] = NULL;
 292         ei_close(dev);
 293         outw((option_reg & ~EnableIRQ) | MemDisable | NICReset | ChipReset,
 294                  ioaddr + HPP_OPTION);
 295 
 296         MOD_DEC_USE_COUNT;
 297         return 0;
 298 }
 299 
 300 static void
 301 hpp_reset_8390(struct device *dev)
     /*  */
 302 {
 303         int ioaddr = dev->base_addr - NIC_OFFSET;
 304         int option_reg = inw(ioaddr + HPP_OPTION);
 305 
 306         if (ei_debug > 1) printk("resetting the 8390 time=%ld...", jiffies);
 307 
 308         outw(option_reg & ~(NICReset + ChipReset), ioaddr + HPP_OPTION);
 309         /* Pause a few cycles for the hardware reset to take place. */
 310         SLOW_DOWN_IO;
 311         SLOW_DOWN_IO;
 312         ei_status.txing = 0;
 313         outw(option_reg | (EnableIRQ + NICReset + ChipReset), ioaddr + HPP_OPTION);
 314 
 315         SLOW_DOWN_IO; SLOW_DOWN_IO;
 316 
 317 
 318         if ((inb_p(ioaddr+NIC_OFFSET+EN0_ISR) & ENISR_RESET) == 0)
 319                 printk("%s: hp_reset_8390() did not complete.\n", dev->name);
 320 
 321         if (ei_debug > 1) printk("8390 reset done (%ld).", jiffies);
 322         return;
 323 }
 324 
 325 /* The programmed-I/O version of reading the 4 byte 8390 specific header.
 326    Note that transfer with the EtherTwist+ must be on word boundaries. */
 327 
 328 static void
 329 hpp_io_get_8390_hdr(struct device *dev, struct e8390_pkt_hdr *hdr, int ring_page)
     /*  */
 330 {
 331         int ioaddr = dev->base_addr - NIC_OFFSET;
 332 
 333         outw((ring_page<<8), ioaddr + HPP_IN_ADDR);
 334         insw(ioaddr + HP_DATAPORT, hdr, sizeof(struct e8390_pkt_hdr)>>1);
 335 }
 336 
 337 /* Block input and output, similar to the Crynwr packet driver. */
 338 
 339 static void
 340 hpp_io_block_input(struct device *dev, int count, struct sk_buff *skb, int ring_offset)
     /*  */
 341 {
 342         int ioaddr = dev->base_addr - NIC_OFFSET;
 343         char *buf = skb->data;
 344 
 345         outw(ring_offset, ioaddr + HPP_IN_ADDR);
 346         insw(ioaddr + HP_DATAPORT, buf, count>>1);
 347         if (count & 0x01)
 348         buf[count-1] = inw(ioaddr + HP_DATAPORT);
 349 }
 350 
 351 /* The corresponding shared memory versions of the above 2 functions. */
 352 
 353 static void
 354 hpp_mem_get_8390_hdr(struct device *dev, struct e8390_pkt_hdr *hdr, int ring_page)
     /*  */
 355 {
 356         int ioaddr = dev->base_addr - NIC_OFFSET;
 357         int option_reg = inw(ioaddr + HPP_OPTION);
 358 
 359         outw((ring_page<<8), ioaddr + HPP_IN_ADDR);
 360         outw(option_reg & ~(MemDisable + BootROMEnb), ioaddr + HPP_OPTION);
 361         memcpy_fromio(hdr, dev->mem_start, sizeof(struct e8390_pkt_hdr));
 362         outw(option_reg, ioaddr + HPP_OPTION);
 363         hdr->count = (hdr->count + 3) & ~3;     /* Round up allocation. */
 364 }
 365 
 366 static void
 367 hpp_mem_block_input(struct device *dev, int count, struct sk_buff *skb, int ring_offset)
     /*  */
 368 {
 369         int ioaddr = dev->base_addr - NIC_OFFSET;
 370         int option_reg = inw(ioaddr + HPP_OPTION);
 371 
 372         outw(ring_offset, ioaddr + HPP_IN_ADDR);
 373 
 374         outw(option_reg & ~(MemDisable + BootROMEnb), ioaddr + HPP_OPTION);
 375 
 376         /* Caution: this relies on get_8390_hdr() rounding up count!
 377            Also note that we *can't* use eth_io_copy_and_sum() because
 378            it will not always copy "count" bytes (e.g. padded IP).  */
 379 
 380         memcpy_fromio(skb->data, dev->mem_start, count);
 381         outw(option_reg, ioaddr + HPP_OPTION);
 382 }
 383 
 384 /* A special note: we *must* always transfer >=16 bit words.
 385    It's always safe to round up, so we do. */
 386 static void
 387 hpp_io_block_output(struct device *dev, int count,
     /*  */
 388                                         const unsigned char *buf, const start_page)
 389 {
 390         int ioaddr = dev->base_addr - NIC_OFFSET;
 391         outw(start_page << 8, ioaddr + HPP_OUT_ADDR);
 392         outsl(ioaddr + HP_DATAPORT, buf, (count+3)>>2);
 393         return;
 394 }
 395 
 396 static void
 397 hpp_mem_block_output(struct device *dev, int count,
     /*  */
 398                                 const unsigned char *buf, const start_page)
 399 {
 400         int ioaddr = dev->base_addr - NIC_OFFSET;
 401         int option_reg = inw(ioaddr + HPP_OPTION);
 402 
 403         outw(start_page << 8, ioaddr + HPP_OUT_ADDR);
 404         outw(option_reg & ~(MemDisable + BootROMEnb), ioaddr + HPP_OPTION);
 405         memcpy_toio(dev->mem_start, buf, (count + 3) & ~3);
 406         outw(option_reg, ioaddr + HPP_OPTION);
 407 
 408         return;
 409 }
 410 
 411 
 412 #ifdef MODULE
 413 #define MAX_HPP_CARDS   4       /* Max number of HPP cards per module */
 414 #define NAMELEN         8       /* # of chars for storing dev->name */
 415 static char namelist[NAMELEN * MAX_HPP_CARDS] = { 0, };
 416 static struct device dev_hpp[MAX_HPP_CARDS] = {
 417         {
 418                 NULL,           /* assign a chunk of namelist[] below */
 419                 0, 0, 0, 0,
 420                 0, 0,
 421                 0, 0, 0, NULL, NULL
 422         },
 423 };
 424 
 425 static int io[MAX_HPP_CARDS] = { 0, };
 426 static int irq[MAX_HPP_CARDS]  = { 0, };
 427 
 428 /* This is set up so that only a single autoprobe takes place per call.
 429 ISA device autoprobes on a running machine are not recommended. */
 430 int
 431 init_module(void)
     /*  */
 432 {
 433         int this_dev, found = 0;
 434 
 435         for (this_dev = 0; this_dev < MAX_HPP_CARDS; this_dev++) {
 436                 struct device *dev = &dev_hpp[this_dev];
 437                 dev->name = namelist+(NAMELEN*this_dev);
 438                 dev->irq = irq[this_dev];
 439                 dev->base_addr = io[this_dev];
 440                 dev->init = hp_plus_probe;
 441                 if (io[this_dev] == 0)  {
 442                         if (this_dev != 0) break; /* only autoprobe 1st one */
 443                         printk(KERN_NOTICE "hp-plus.c: Presently autoprobing (not recommended) for a single card.\n");
 444                 }
 445                 if (register_netdev(dev) != 0) {
 446                         printk(KERN_WARNING "hp-plus.c: No HP-Plus card found (i/o = 0x%x).\n", io[this_dev]);
 447                         if (found != 0) return 0;       /* Got at least one. */
 448                         return -ENXIO;
 449                 }
 450                 found++;
 451         }
 452 
 453         return 0;
 454 }
 455 
 456 void
 457 cleanup_module(void)
     /*  */
 458 {
 459         int this_dev;
 460 
 461         for (this_dev = 0; this_dev < MAX_HPP_CARDS; this_dev++) {
 462                 struct device *dev = &dev_hpp[this_dev];
 463                 if (dev->priv != NULL) {
 464                         /* NB: hpp_close() handles free_irq + irq2dev map */
 465                         int ioaddr = dev->base_addr - NIC_OFFSET;
 466                         kfree(dev->priv);
 467                         dev->priv = NULL;
 468                         release_region(ioaddr, HP_IO_EXTENT);
 469                         unregister_netdev(dev);
 470                 }
 471         }
 472 }
 473 #endif /* MODULE */
 474 
 475 /*
 476  * Local variables:
 477  * compile-command: "gcc -D__KERNEL__ -I/usr/src/linux/net/inet -Wall -Wstrict-prototypes -O6 -m486 -c hp-plus.c"
 478  * version-control: t
 479  * kept-new-versions: 5
 480  * tab-width: 4
 481  * c-indent-level: 4
 482  * End:
 483  */
/* */
root/drivers/net/hp-plus.c

DEFINITIONS
