drivers/net/dm9000.c

   1 /*
   2  *   dm9000.c: Version 1.2 03/18/2003
   3  *
   4  *         A Davicom DM9000 ISA NIC fast Ethernet driver for Linux.
   5  *      Copyright (C) 1997  Sten Wang
   6  *
   7  *      This program is free software; you can redistribute it and/or
   8  *      modify it under the terms of the GNU General Public License
   9  *      as published by the Free Software Foundation; either version 2
  10  *      of the License, or (at your option) any later version.
  11  *
  12  *      This program is distributed in the hope that it will be useful,
  13  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *      GNU General Public License for more details.
  16  *
  17  *   (C)Copyright 1997-1998 DAVICOM Semiconductor,Inc. All Rights Reserved.
  18  *
  19  * V0.11        06/20/2001      REG_0A bit3=1, default enable BP with DA match
  20  *      06/22/2001      Support DM9801 progrmming
  21  *                      E3: R25 = ((R24 + NF) & 0x00ff) | 0xf000
  22  *                      E4: R25 = ((R24 + NF) & 0x00ff) | 0xc200
  23  *                              R17 = (R17 & 0xfff0) | NF + 3
  24  *                      E5: R25 = ((R24 + NF - 3) & 0x00ff) | 0xc200
  25  *                              R17 = (R17 & 0xfff0) | NF
  26  *
  27  * v1.00                modify by simon 2001.9.5
  28  *                         change for kernel 2.4.x
  29  *
  30  * v1.1   11/09/2001            fix force mode bug
  31  *
  32  * v1.2   03/18/2003       Weilun Huang <weilun_huang@davicom.com.tw>:
  33  *                      Fixed phy reset.
  34  *                      Added tx/rx 32 bit mode.
  35  *                      Cleaned up for kernel merge.
  36  *
  37  *        03/03/2004    Sascha Hauer <s.hauer@pengutronix.de>
  38  *                      Port to 2.6 kernel
  39  *
  40  *        24-Sep-2004   Ben Dooks <ben@simtec.co.uk>
  41  *                      Cleanup of code to remove ifdefs
  42  *                      Allowed platform device data to influence access width
  43  *                      Reformatting areas of code
  44  *
  45  *        17-Mar-2005   Sascha Hauer <s.hauer@pengutronix.de>
  46  *                      * removed 2.4 style module parameters
  47  *                      * removed removed unused stat counter and fixed
  48  *                        net_device_stats
  49  *                      * introduced tx_timeout function
  50  *                      * reworked locking
  51  *
  52  *        01-Jul-2005   Ben Dooks <ben@simtec.co.uk>
  53  *                      * fixed spinlock call without pointer
  54  *                      * ensure spinlock is initialised
  55  */
  56
  57 #include <linux/module.h>
  58 #include <linux/ioport.h>
  59 #include <linux/netdevice.h>
  60 #include <linux/etherdevice.h>
  61 #include <linux/init.h>
  62 #include <linux/skbuff.h>
  63 #include <linux/spinlock.h>
  64 #include <linux/crc32.h>
  65 #include <linux/mii.h>
  66 #include <linux/dm9000.h>
  67 #include <linux/delay.h>
  68 #include <linux/platform_device.h>
  69
  70 #include <asm/delay.h>
  71 #include <asm/irq.h>
  72 #include <asm/io.h>
  73
  74 #include "dm9000.h"
  75
  76 /* Board/System/Debug information/definition ---------------- */
  77
  78 #define DM9000_PHY              0x40    /* PHY address 0x01 */
  79
  80 #define CARDNAME "dm9000"
  81 #define PFX CARDNAME ": "
  82
  83 #define DM9000_TIMER_WUT  jiffies+(HZ*2)        /* timer wakeup time : 2 second */
  84
  85 #define DM9000_DEBUG 0
  86
  87 #if DM9000_DEBUG > 2
  88 #define PRINTK3(args...)  printk(CARDNAME ": " args)
  89 #else
  90 #define PRINTK3(args...)  do { } while(0)
  91 #endif
  92
  93 #if DM9000_DEBUG > 1
  94 #define PRINTK2(args...)  printk(CARDNAME ": " args)
  95 #else
  96 #define PRINTK2(args...)  do { } while(0)
  97 #endif
  98
  99 #if DM9000_DEBUG > 0
 100 #define PRINTK1(args...)  printk(CARDNAME ": " args)
 101 #define PRINTK(args...)   printk(CARDNAME ": " args)
 102 #else
 103 #define PRINTK1(args...)  do { } while(0)
 104 #define PRINTK(args...)   printk(KERN_DEBUG args)
 105 #endif
 106
 107 #ifdef CONFIG_BLACKFIN
 108 #define readsb  insb
 109 #define readsw  insw
 110 #define readsl  insl
 111 #define writesb outsb
 112 #define writesw outsw
 113 #define writesl outsl
 114 #define DM9000_IRQ_FLAGS        (IRQF_SHARED | IRQF_TRIGGER_HIGH)
 115 #else
 116 #define DM9000_IRQ_FLAGS        IRQF_SHARED
 117 #endif
 118
 119 /*
 120  * Transmit timeout, default 5 seconds.
 121  */
 122 static int watchdog = 5000;
 123 module_param(watchdog, int, 0400);
 124 MODULE_PARM_DESC(watchdog, "transmit timeout in milliseconds");
 125
 126 /* Structure/enum declaration ------------------------------- */
 127 typedef struct board_info {
 128
 129         void __iomem *io_addr;  /* Register I/O base address */
 130         void __iomem *io_data;  /* Data I/O address */
 131         u16 irq;                /* IRQ */
 132
 133         u16 tx_pkt_cnt;
 134         u16 queue_pkt_len;
 135         u16 queue_start_addr;
 136         u16 dbug_cnt;
 137         u8 io_mode;             /* 0:word, 2:byte */
 138         u8 phy_addr;
 139
 140         void (*inblk)(void __iomem *port, void *data, int length);
 141         void (*outblk)(void __iomem *port, void *data, int length);
 142         void (*dumpblk)(void __iomem *port, int length);
 143
 144         struct resource *addr_res;   /* resources found */
 145         struct resource *data_res;
 146         struct resource *addr_req;   /* resources requested */
 147         struct resource *data_req;
 148         struct resource *irq_res;
 149
 150         struct timer_list timer;
 151         struct net_device_stats stats;
 152         unsigned char srom[128];
 153         spinlock_t lock;
 154
 155         struct mii_if_info mii;
 156         u32 msg_enable;
 157 } board_info_t;
 158
 159 /* function declaration ------------------------------------- */
 160 static int dm9000_probe(struct platform_device *);
 161 static int dm9000_open(struct net_device *);
 162 static int dm9000_start_xmit(struct sk_buff *, struct net_device *);
 163 static int dm9000_stop(struct net_device *);
 164
 165
 166 static void dm9000_timer(unsigned long);
 167 static void dm9000_init_dm9000(struct net_device *);
 168
 169 static struct net_device_stats *dm9000_get_stats(struct net_device *);
 170
 171 static irqreturn_t dm9000_interrupt(int, void *);
 172
 173 static int dm9000_phy_read(struct net_device *dev, int phyaddr_unsused, int reg);
 174 static void dm9000_phy_write(struct net_device *dev, int phyaddr_unused, int reg,
 175                            int value);
 176 static u16 read_srom_word(board_info_t *, int);
 177 static void dm9000_rx(struct net_device *);
 178 static void dm9000_hash_table(struct net_device *);
 179
 180 //#define DM9000_PROGRAM_EEPROM
 181 #ifdef DM9000_PROGRAM_EEPROM
 182 static void program_eeprom(board_info_t * db);
 183 #endif
 184 /* DM9000 network board routine ---------------------------- */
 185
 186 static void
 187 dm9000_reset(board_info_t * db)
 188 {
 189         PRINTK1("dm9000x: resetting\n");
 190         /* RESET device */
 191         writeb(DM9000_NCR, db->io_addr);
 192         udelay(200);
 193         writeb(NCR_RST, db->io_data);
 194         udelay(200);
 195 }
 196
 197 /*
 198  *   Read a byte from I/O port
 199  */
 200 static u8
 201 ior(board_info_t * db, int reg)
 202 {
 203         writeb(reg, db->io_addr);
 204         return readb(db->io_data);
 205 }
 206
 207 /*
 208  *   Write a byte to I/O port
 209  */
 210
 211 static void
 212 iow(board_info_t * db, int reg, int value)
 213 {
 214         writeb(reg, db->io_addr);
 215         writeb(value, db->io_data);
 216 }
 217
 218 /* routines for sending block to chip */
 219
 220 static void dm9000_outblk_8bit(void __iomem *reg, void *data, int count)
 221 {
 222         writesb(reg, data, count);
 223 }
 224
 225 static void dm9000_outblk_16bit(void __iomem *reg, void *data, int count)
 226 {
 227         writesw(reg, data, (count+1) >> 1);
 228 }
 229
 230 static void dm9000_outblk_32bit(void __iomem *reg, void *data, int count)
 231 {
 232         writesl(reg, data, (count+3) >> 2);
 233 }
 234
 235 /* input block from chip to memory */
 236
 237 static void dm9000_inblk_8bit(void __iomem *reg, void *data, int count)
 238 {
 239         readsb(reg, data, count);
 240 }
 241
 242
 243 static void dm9000_inblk_16bit(void __iomem *reg, void *data, int count)
 244 {
 245         readsw(reg, data, (count+1) >> 1);
 246 }
 247
 248 static void dm9000_inblk_32bit(void __iomem *reg, void *data, int count)
 249 {
 250         readsl(reg, data, (count+3) >> 2);
 251 }
 252
 253 /* dump block from chip to null */
 254
 255 static void dm9000_dumpblk_8bit(void __iomem *reg, int count)
 256 {
 257         int i;
 258         int tmp;
 259
 260         for (i = 0; i < count; i++)
 261                 tmp = readb(reg);
 262 }
 263
 264 static void dm9000_dumpblk_16bit(void __iomem *reg, int count)
 265 {
 266         int i;
 267         int tmp;
 268
 269         count = (count + 1) >> 1;
 270
 271         for (i = 0; i < count; i++)
 272                 tmp = readw(reg);
 273 }
 274
 275 static void dm9000_dumpblk_32bit(void __iomem *reg, int count)
 276 {
 277         int i;
 278         int tmp;
 279
 280         count = (count + 3) >> 2;
 281
 282         for (i = 0; i < count; i++)
 283                 tmp = readl(reg);
 284 }
 285
 286 /* dm9000_set_io
 287  *
 288  * select the specified set of io routines to use with the
 289  * device
 290  */
 291
 292 static void dm9000_set_io(struct board_info *db, int byte_width)
 293 {
 294         /* use the size of the data resource to work out what IO
 295          * routines we want to use
 296          */
 297
 298         switch (byte_width) {
 299         case 1:
 300                 db->dumpblk = dm9000_dumpblk_8bit;
 301                 db->outblk  = dm9000_outblk_8bit;
 302                 db->inblk   = dm9000_inblk_8bit;
 303                 break;
 304
 305         case 2:
 306                 db->dumpblk = dm9000_dumpblk_16bit;
 307                 db->outblk  = dm9000_outblk_16bit;
 308                 db->inblk   = dm9000_inblk_16bit;
 309                 break;
 310
 311         case 3:
 312                 printk(KERN_ERR PFX ": 3 byte IO, falling back to 16bit\n");
 313                 db->dumpblk = dm9000_dumpblk_16bit;
 314                 db->outblk  = dm9000_outblk_16bit;
 315                 db->inblk   = dm9000_inblk_16bit;
 316                 break;
 317
 318         case 4:
 319         default:
 320                 db->dumpblk = dm9000_dumpblk_32bit;
 321                 db->outblk  = dm9000_outblk_32bit;
 322                 db->inblk   = dm9000_inblk_32bit;
 323                 break;
 324         }
 325 }
 326
 327
 328 /* Our watchdog timed out. Called by the networking layer */
 329 static void dm9000_timeout(struct net_device *dev)
 330 {
 331         board_info_t *db = (board_info_t *) dev->priv;
 332         u8 reg_save;
 333         unsigned long flags;
 334
 335         /* Save previous register address */
 336         reg_save = readb(db->io_addr);
 337         spin_lock_irqsave(&db->lock,flags);
 338
 339         netif_stop_queue(dev);
 340         dm9000_reset(db);
 341         dm9000_init_dm9000(dev);
 342         /* We can accept TX packets again */
 343         dev->trans_start = jiffies;
 344         netif_wake_queue(dev);
 345
 346         /* Restore previous register address */
 347         writeb(reg_save, db->io_addr);
 348         spin_unlock_irqrestore(&db->lock,flags);
 349 }
 350
 351 #ifdef CONFIG_NET_POLL_CONTROLLER
 352 /*
 353  *Used by netconsole
 354  */
 355 static void dm9000_poll_controller(struct net_device *dev)
 356 {
 357         disable_irq(dev->irq);
 358         dm9000_interrupt(dev->irq,dev);
 359         enable_irq(dev->irq);
 360 }
 361 #endif
 362
 363 /* dm9000_release_board
 364  *
 365  * release a board, and any mapped resources
 366  */
 367
 368 static void
 369 dm9000_release_board(struct platform_device *pdev, struct board_info *db)
 370 {
 371         if (db->data_res == NULL) {
 372                 if (db->addr_res != NULL)
 373                         release_mem_region((unsigned long)db->io_addr, 4);
 374                 return;
 375         }
 376
 377         /* unmap our resources */
 378
 379         iounmap(db->io_addr);
 380         iounmap(db->io_data);
 381
 382         /* release the resources */
 383
 384         if (db->data_req != NULL) {
 385                 release_resource(db->data_req);
 386                 kfree(db->data_req);
 387         }
 388
 389         if (db->addr_req != NULL) {
 390                 release_resource(db->addr_req);
 391                 kfree(db->addr_req);
 392         }
 393 }
 394
 395 #define res_size(_r) (((_r)->end - (_r)->start) + 1)
 396
 397 /*
 398  * Search DM9000 board, allocate space and register it
 399  */
 400 static int
 401 dm9000_probe(struct platform_device *pdev)
 402 {
 403         struct dm9000_plat_data *pdata = pdev->dev.platform_data;
 404         struct board_info *db;  /* Point a board information structure */
 405         struct net_device *ndev;
 406         unsigned long base;
 407         int ret = 0;
 408         int iosize;
 409         int i;
 410         u32 id_val;
 411
 412         /* Init network device */
 413         ndev = alloc_etherdev(sizeof (struct board_info));
 414         if (!ndev) {
 415                 printk("%s: could not allocate device.\n", CARDNAME);
 416                 return -ENOMEM;
 417         }
 418
 419         SET_MODULE_OWNER(ndev);
 420         SET_NETDEV_DEV(ndev, &pdev->dev);
 421
 422         PRINTK2("dm9000_probe()");
 423
 424         /* setup board info structure */
 425         db = (struct board_info *) ndev->priv;
 426         memset(db, 0, sizeof (*db));
 427
 428         spin_lock_init(&db->lock);
 429
 430         if (pdev->num_resources < 2) {
 431                 ret = -ENODEV;
 432                 goto out;
 433         } else if (pdev->num_resources == 2) {
 434                 base = pdev->resource[0].start;
 435
 436                 if (!request_mem_region(base, 4, ndev->name)) {
 437                         ret = -EBUSY;
 438                         goto out;
 439                 }
 440
 441                 ndev->base_addr = base;
 442                 ndev->irq = pdev->resource[1].start;
 443                 db->io_addr = (void __iomem *)base;
 444                 db->io_data = (void __iomem *)(base + 4);
 445
 446                 /* ensure at least we have a default set of IO routines */
 447                 dm9000_set_io(db, 2);
 448
 449         } else {
 450                 db->addr_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 451                 db->data_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 452                 db->irq_res  = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 453
 454                 if (db->addr_res == NULL || db->data_res == NULL ||
 455                     db->irq_res == NULL) {
 456                         printk(KERN_ERR PFX "insufficient resources\n");
 457                         ret = -ENOENT;
 458                         goto out;
 459                 }
 460
 461                 i = res_size(db->addr_res);
 462                 db->addr_req = request_mem_region(db->addr_res->start, i,
 463                                                   pdev->name);
 464
 465                 if (db->addr_req == NULL) {
 466                         printk(KERN_ERR PFX "cannot claim address reg area\n");
 467                         ret = -EIO;
 468                         goto out;
 469                 }
 470
 471                 db->io_addr = ioremap(db->addr_res->start, i);
 472
 473                 if (db->io_addr == NULL) {
 474                         printk(KERN_ERR "failed to ioremap address reg\n");
 475                         ret = -EINVAL;
 476                         goto out;
 477                 }
 478
 479                 iosize = res_size(db->data_res);
 480                 db->data_req = request_mem_region(db->data_res->start, iosize,
 481                                                   pdev->name);
 482
 483                 if (db->data_req == NULL) {
 484                         printk(KERN_ERR PFX "cannot claim data reg area\n");
 485                         ret = -EIO;
 486                         goto out;
 487                 }
 488
 489                 db->io_data = ioremap(db->data_res->start, iosize);
 490
 491                 if (db->io_data == NULL) {
 492                         printk(KERN_ERR "failed to ioremap data reg\n");
 493                         ret = -EINVAL;
 494                         goto out;
 495                 }
 496
 497                 /* fill in parameters for net-dev structure */
 498
 499                 ndev->base_addr = (unsigned long)db->io_addr;
 500                 ndev->irq       = db->irq_res->start;
 501
 502                 /* ensure at least we have a default set of IO routines */
 503                 dm9000_set_io(db, iosize);
 504         }
 505
 506         /* check to see if anything is being over-ridden */
 507         if (pdata != NULL) {
 508                 /* check to see if the driver wants to over-ride the
 509                  * default IO width */
 510
 511                 if (pdata->flags & DM9000_PLATF_8BITONLY)
 512                         dm9000_set_io(db, 1);
 513
 514                 if (pdata->flags & DM9000_PLATF_16BITONLY)
 515                         dm9000_set_io(db, 2);
 516
 517                 if (pdata->flags & DM9000_PLATF_32BITONLY)
 518                         dm9000_set_io(db, 4);
 519
 520                 /* check to see if there are any IO routine
 521                  * over-rides */
 522
 523                 if (pdata->inblk != NULL)
 524                         db->inblk = pdata->inblk;
 525
 526                 if (pdata->outblk != NULL)
 527                         db->outblk = pdata->outblk;
 528
 529                 if (pdata->dumpblk != NULL)
 530                         db->dumpblk = pdata->dumpblk;
 531         }
 532
 533         dm9000_reset(db);
 534
 535         /* try two times, DM9000 sometimes gets the first read wrong */
 536         for (i = 0; i < 2; i++) {
 537                 id_val  = ior(db, DM9000_VIDL);
 538                 id_val |= (u32)ior(db, DM9000_VIDH) << 8;
 539                 id_val |= (u32)ior(db, DM9000_PIDL) << 16;
 540                 id_val |= (u32)ior(db, DM9000_PIDH) << 24;
 541
 542                 if (id_val == DM9000_ID)
 543                         break;
 544                 printk("%s: read wrong id 0x%08x\n", CARDNAME, id_val);
 545         }
 546
 547         if (id_val != DM9000_ID) {
 548                 printk("%s: wrong id: 0x%08x\n", CARDNAME, id_val);
 549                 goto release;
 550         }
 551
 552         /* from this point we assume that we have found a DM9000 */
 553
 554         /* driver system function */
 555         ether_setup(ndev);
 556
 557         ndev->open               = &dm9000_open;
 558         ndev->hard_start_xmit    = &dm9000_start_xmit;
 559         ndev->tx_timeout         = &dm9000_timeout;
 560         ndev->watchdog_timeo = msecs_to_jiffies(watchdog);
 561         ndev->stop               = &dm9000_stop;
 562         ndev->get_stats          = &dm9000_get_stats;
 563         ndev->set_multicast_list = &dm9000_hash_table;
 564 #ifdef CONFIG_NET_POLL_CONTROLLER
 565         ndev->poll_controller    = &dm9000_poll_controller;
 566 #endif
 567
 568 #ifdef DM9000_PROGRAM_EEPROM
 569         program_eeprom(db);
 570 #endif
 571         db->msg_enable       = NETIF_MSG_LINK;
 572         db->mii.phy_id_mask  = 0x1f;
 573         db->mii.reg_num_mask = 0x1f;
 574         db->mii.force_media  = 0;
 575         db->mii.full_duplex  = 0;
 576         db->mii.dev          = ndev;
 577         db->mii.mdio_read    = dm9000_phy_read;
 578         db->mii.mdio_write   = dm9000_phy_write;
 579
 580         /* Read SROM content */
 581         for (i = 0; i < 64; i++)
 582                 ((u16 *) db->srom)[i] = read_srom_word(db, i);
 583
 584         /* Set Node Address */
 585         for (i = 0; i < 6; i++)
 586                 ndev->dev_addr[i] = db->srom[i];
 587
 588         if (!is_valid_ether_addr(ndev->dev_addr)) {
 589                 /* try reading from mac */
 590
 591                 for (i = 0; i < 6; i++)
 592                         ndev->dev_addr[i] = ior(db, i+DM9000_PAR);
 593         }
 594
 595         if (!is_valid_ether_addr(ndev->dev_addr))
 596                 printk("%s: Invalid ethernet MAC address.  Please "
 597                        "set using ifconfig\n", ndev->name);
 598
 599         platform_set_drvdata(pdev, ndev);
 600         ret = register_netdev(ndev);
 601
 602         if (ret == 0) {
 603                 printk("%s: dm9000 at %p,%p IRQ %d MAC: ",
 604                        ndev->name,  db->io_addr, db->io_data, ndev->irq);
 605                 for (i = 0; i < 5; i++)
 606                         printk("%02x:", ndev->dev_addr[i]);
 607                 printk("%02x\n", ndev->dev_addr[5]);
 608         }
 609         return 0;
 610
 611  release:
 612  out:
 613         printk("%s: not found (%d).\n", CARDNAME, ret);
 614
 615         dm9000_release_board(pdev, db);
 616         free_netdev(ndev);
 617
 618         return ret;
 619 }
 620
 621 /*
 622  *  Open the interface.
 623  *  The interface is opened whenever "ifconfig" actives it.
 624  */
 625 static int
 626 dm9000_open(struct net_device *dev)
 627 {
 628         board_info_t *db = (board_info_t *) dev->priv;
 629
 630         PRINTK2("entering dm9000_open\n");
 631
 632         if (request_irq(dev->irq, &dm9000_interrupt, DM9000_IRQ_FLAGS, dev->name, dev))
 633                 return -EAGAIN;
 634
 635         /* Initialize DM9000 board */
 636         dm9000_reset(db);
 637         dm9000_init_dm9000(dev);
 638
 639         /* Init driver variable */
 640         db->dbug_cnt = 0;
 641
 642         /* set and active a timer process */
 643         init_timer(&db->timer);
 644         db->timer.expires  = DM9000_TIMER_WUT;
 645         db->timer.data     = (unsigned long) dev;
 646         db->timer.function = &dm9000_timer;
 647         add_timer(&db->timer);
 648
 649         mii_check_media(&db->mii, netif_msg_link(db), 1);
 650         netif_start_queue(dev);
 651
 652         return 0;
 653 }
 654
 655 /*
 656  * Initilize dm9000 board
 657  */
 658 static void
 659 dm9000_init_dm9000(struct net_device *dev)
 660 {
 661         board_info_t *db = (board_info_t *) dev->priv;
 662
 663         PRINTK1("entering %s\n",__FUNCTION__);
 664
 665         /* I/O mode */
 666         db->io_mode = ior(db, DM9000_ISR) >> 6; /* ISR bit7:6 keeps I/O mode */
 667
 668         /* GPIO0 on pre-activate PHY */
 669         iow(db, DM9000_GPR, 0); /* REG_1F bit0 activate phyxcer */
 670         iow(db, DM9000_GPCR, GPCR_GEP_CNTL);    /* Let GPIO0 output */
 671         iow(db, DM9000_GPR, 0); /* Enable PHY */
 672
 673         /* Program operating register */
 674         iow(db, DM9000_TCR, 0);         /* TX Polling clear */
 675         iow(db, DM9000_BPTR, 0x3f);     /* Less 3Kb, 200us */
 676         iow(db, DM9000_FCR, 0xff);      /* Flow Control */
 677         iow(db, DM9000_SMCR, 0);        /* Special Mode */
 678         /* clear TX status */
 679         iow(db, DM9000_NSR, NSR_WAKEST | NSR_TX2END | NSR_TX1END);
 680         iow(db, DM9000_ISR, ISR_CLR_STATUS); /* Clear interrupt status */
 681
 682         /* Set address filter table */
 683         dm9000_hash_table(dev);
 684
 685         /* Activate DM9000 */
 686         iow(db, DM9000_RCR, RCR_DIS_LONG | RCR_DIS_CRC | RCR_RXEN);
 687         /* Enable TX/RX interrupt mask */
 688         iow(db, DM9000_IMR, IMR_PAR | IMR_PTM | IMR_PRM);
 689
 690         /* Init Driver variable */
 691         db->tx_pkt_cnt = 0;
 692         db->queue_pkt_len = 0;
 693         dev->trans_start = 0;
 694 }
 695
 696 /*
 697  *  Hardware start transmission.
 698  *  Send a packet to media from the upper layer.
 699  */
 700 static int
 701 dm9000_start_xmit(struct sk_buff *skb, struct net_device *dev)
 702 {
 703         unsigned long flags;
 704         board_info_t *db = (board_info_t *) dev->priv;
 705
 706         PRINTK3("dm9000_start_xmit\n");
 707
 708         if (db->tx_pkt_cnt > 1)
 709                 return 1;
 710
 711         spin_lock_irqsave(&db->lock, flags);
 712
 713         /* Move data to DM9000 TX RAM */
 714         writeb(DM9000_MWCMD, db->io_addr);
 715
 716         (db->outblk)(db->io_data, skb->data, skb->len);
 717         db->stats.tx_bytes += skb->len;
 718
 719         db->tx_pkt_cnt++;
 720         /* TX control: First packet immediately send, second packet queue */
 721         if (db->tx_pkt_cnt == 1) {
 722                 /* Set TX length to DM9000 */
 723                 iow(db, DM9000_TXPLL, skb->len & 0xff);
 724                 iow(db, DM9000_TXPLH, (skb->len >> 8) & 0xff);
 725
 726                 /* Issue TX polling command */
 727                 iow(db, DM9000_TCR, TCR_TXREQ); /* Cleared after TX complete */
 728
 729                 dev->trans_start = jiffies;     /* save the time stamp */
 730         } else {
 731                 /* Second packet */
 732                 db->queue_pkt_len = skb->len;
 733                 netif_stop_queue(dev);
 734         }
 735
 736         spin_unlock_irqrestore(&db->lock, flags);
 737
 738         /* free this SKB */
 739         dev_kfree_skb(skb);
 740
 741         return 0;
 742 }
 743
 744 static void
 745 dm9000_shutdown(struct net_device *dev)
 746 {
 747         board_info_t *db = (board_info_t *) dev->priv;
 748
 749         /* RESET device */
 750         dm9000_phy_write(dev, 0, MII_BMCR, BMCR_RESET); /* PHY RESET */
 751         iow(db, DM9000_GPR, 0x01);      /* Power-Down PHY */
 752         iow(db, DM9000_IMR, IMR_PAR);   /* Disable all interrupt */
 753         iow(db, DM9000_RCR, 0x00);      /* Disable RX */
 754 }
 755
 756 /*
 757  * Stop the interface.
 758  * The interface is stopped when it is brought.
 759  */
 760 static int
 761 dm9000_stop(struct net_device *ndev)
 762 {
 763         board_info_t *db = (board_info_t *) ndev->priv;
 764
 765         PRINTK1("entering %s\n",__FUNCTION__);
 766
 767         /* deleted timer */
 768         del_timer(&db->timer);
 769
 770         netif_stop_queue(ndev);
 771         netif_carrier_off(ndev);
 772
 773         /* free interrupt */
 774         free_irq(ndev->irq, ndev);
 775
 776         dm9000_shutdown(ndev);
 777
 778         return 0;
 779 }
 780
 781 /*
 782  * DM9000 interrupt handler
 783  * receive the packet to upper layer, free the transmitted packet
 784  */
 785
 786 static void
 787 dm9000_tx_done(struct net_device *dev, board_info_t * db)
 788 {
 789         int tx_status = ior(db, DM9000_NSR);    /* Got TX status */
 790
 791         if (tx_status & (NSR_TX2END | NSR_TX1END)) {
 792                 /* One packet sent complete */
 793                 db->tx_pkt_cnt--;
 794                 db->stats.tx_packets++;
 795
 796                 /* Queue packet check & send */
 797                 if (db->tx_pkt_cnt > 0) {
 798                         iow(db, DM9000_TXPLL, db->queue_pkt_len & 0xff);
 799                         iow(db, DM9000_TXPLH, (db->queue_pkt_len >> 8) & 0xff);
 800                         iow(db, DM9000_TCR, TCR_TXREQ);
 801                         dev->trans_start = jiffies;
 802                 }
 803                 netif_wake_queue(dev);
 804         }
 805 }
 806
 807 static irqreturn_t
 808 dm9000_interrupt(int irq, void *dev_id)
 809 {
 810         struct net_device *dev = dev_id;
 811         board_info_t *db;
 812         int int_status;
 813         u8 reg_save;
 814
 815         PRINTK3("entering %s\n",__FUNCTION__);
 816
 817         if (!dev) {
 818                 PRINTK1("dm9000_interrupt() without DEVICE arg\n");
 819                 return IRQ_HANDLED;
 820         }
 821
 822         /* A real interrupt coming */
 823         db = (board_info_t *) dev->priv;
 824         spin_lock(&db->lock);
 825
 826         /* Save previous register address */
 827         reg_save = readb(db->io_addr);
 828
 829         /* Disable all interrupts */
 830         iow(db, DM9000_IMR, IMR_PAR);
 831
 832         /* Got DM9000 interrupt status */
 833         int_status = ior(db, DM9000_ISR);       /* Got ISR */
 834         iow(db, DM9000_ISR, int_status);        /* Clear ISR status */
 835
 836         /* Received the coming packet */
 837         if (int_status & ISR_PRS)
 838                 dm9000_rx(dev);
 839
 840         /* Trnasmit Interrupt check */
 841         if (int_status & ISR_PTS)
 842                 dm9000_tx_done(dev, db);
 843
 844         /* Re-enable interrupt mask */
 845         iow(db, DM9000_IMR, IMR_PAR | IMR_PTM | IMR_PRM);
 846
 847         /* Restore previous register address */
 848         writeb(reg_save, db->io_addr);
 849
 850         spin_unlock(&db->lock);
 851
 852         return IRQ_HANDLED;
 853 }
 854
 855 /*
 856  *  Get statistics from driver.
 857  */
 858 static struct net_device_stats *
 859 dm9000_get_stats(struct net_device *dev)
 860 {
 861         board_info_t *db = (board_info_t *) dev->priv;
 862         return &db->stats;
 863 }
 864
 865
 866 /*
 867  *  A periodic timer routine
 868  *  Dynamic media sense, allocated Rx buffer...
 869  */
 870 static void
 871 dm9000_timer(unsigned long data)
 872 {
 873         struct net_device *dev = (struct net_device *) data;
 874         board_info_t *db = (board_info_t *) dev->priv;
 875
 876         PRINTK3("dm9000_timer()\n");
 877
 878         mii_check_media(&db->mii, netif_msg_link(db), 0);
 879
 880         /* Set timer again */
 881         db->timer.expires = DM9000_TIMER_WUT;
 882         add_timer(&db->timer);
 883 }
 884
 885 struct dm9000_rxhdr {
 886         u16     RxStatus;
 887         u16     RxLen;
 888 } __attribute__((__packed__));
 889
 890 /*
 891  *  Received a packet and pass to upper layer
 892  */
 893 static void
 894 dm9000_rx(struct net_device *dev)
 895 {
 896         board_info_t *db = (board_info_t *) dev->priv;
 897         struct dm9000_rxhdr rxhdr;
 898         struct sk_buff *skb;
 899         u8 rxbyte, *rdptr;
 900         bool GoodPacket;
 901         int RxLen;
 902
 903         /* Check packet ready or not */
 904         do {
 905                 ior(db, DM9000_MRCMDX); /* Dummy read */
 906
 907                 /* Get most updated data */
 908                 rxbyte = readb(db->io_data);
 909
 910                 /* Status check: this byte must be 0 or 1 */
 911                 if (rxbyte > DM9000_PKT_RDY) {
 912                         printk("status check failed: %d\n", rxbyte);
 913                         iow(db, DM9000_RCR, 0x00);      /* Stop Device */
 914                         iow(db, DM9000_ISR, IMR_PAR);   /* Stop INT request */
 915                         return;
 916                 }
 917
 918                 if (rxbyte != DM9000_PKT_RDY)
 919                         return;
 920
 921                 /* A packet ready now  & Get status/length */
 922                 GoodPacket = true;
 923                 writeb(DM9000_MRCMD, db->io_addr);
 924
 925                 (db->inblk)(db->io_data, &rxhdr, sizeof(rxhdr));
 926
 927                 RxLen = rxhdr.RxLen;
 928
 929                 /* Packet Status check */
 930                 if (RxLen < 0x40) {
 931                         GoodPacket = false;
 932                         PRINTK1("Bad Packet received (runt)\n");
 933                 }
 934
 935                 if (RxLen > DM9000_PKT_MAX) {
 936                         PRINTK1("RST: RX Len:%x\n", RxLen);
 937                 }
 938
 939                 if (rxhdr.RxStatus & 0xbf00) {
 940                         GoodPacket = false;
 941                         if (rxhdr.RxStatus & 0x100) {
 942                                 PRINTK1("fifo error\n");
 943                                 db->stats.rx_fifo_errors++;
 944                         }
 945                         if (rxhdr.RxStatus & 0x200) {
 946                                 PRINTK1("crc error\n");
 947                                 db->stats.rx_crc_errors++;
 948                         }
 949                         if (rxhdr.RxStatus & 0x8000) {
 950                                 PRINTK1("length error\n");
 951                                 db->stats.rx_length_errors++;
 952                         }
 953                 }
 954
 955                 /* Move data from DM9000 */
 956                 if (GoodPacket
 957                     && ((skb = dev_alloc_skb(RxLen + 4)) != NULL)) {
 958                         skb_reserve(skb, 2);
 959                         rdptr = (u8 *) skb_put(skb, RxLen - 4);
 960
 961                         /* Read received packet from RX SRAM */
 962
 963                         (db->inblk)(db->io_data, rdptr, RxLen);
 964                         db->stats.rx_bytes += RxLen;
 965
 966                         /* Pass to upper layer */
 967                         skb->protocol = eth_type_trans(skb, dev);
 968                         netif_rx(skb);
 969                         db->stats.rx_packets++;
 970
 971                 } else {
 972                         /* need to dump the packet's data */
 973
 974                         (db->dumpblk)(db->io_data, RxLen);
 975                 }
 976         } while (rxbyte == DM9000_PKT_RDY);
 977 }
 978
 979 /*
 980  *  Read a word data from SROM
 981  */
 982 static u16
 983 read_srom_word(board_info_t * db, int offset)
 984 {
 985         iow(db, DM9000_EPAR, offset);
 986         iow(db, DM9000_EPCR, EPCR_ERPRR);
 987         mdelay(8);              /* according to the datasheet 200us should be enough,
 988                                    but it doesn't work */
 989         iow(db, DM9000_EPCR, 0x0);
 990         return (ior(db, DM9000_EPDRL) + (ior(db, DM9000_EPDRH) << 8));
 991 }
 992
 993 #ifdef DM9000_PROGRAM_EEPROM
 994 /*
 995  * Write a word data to SROM
 996  */
 997 static void
 998 write_srom_word(board_info_t * db, int offset, u16 val)
 999 {
1000         iow(db, DM9000_EPAR, offset);
1001         iow(db, DM9000_EPDRH, ((val >> 8) & 0xff));
1002         iow(db, DM9000_EPDRL, (val & 0xff));
1003         iow(db, DM9000_EPCR, EPCR_WEP | EPCR_ERPRW);
1004         mdelay(8);              /* same shit */
1005         iow(db, DM9000_EPCR, 0);
1006 }
1007
1008 /*
1009  * Only for development:
1010  * Here we write static data to the eeprom in case
1011  * we don't have valid content on a new board
1012  */
1013 static void
1014 program_eeprom(board_info_t * db)
1015 {
1016         u16 eeprom[] = { 0x0c00, 0x007f, 0x1300,        /* MAC Address */
1017                 0x0000,         /* Autoload: accept nothing */
1018                 0x0a46, 0x9000, /* Vendor / Product ID */
1019                 0x0000,         /* pin control */
1020                 0x0000,
1021         };                      /* Wake-up mode control */
1022         int i;
1023         for (i = 0; i < 8; i++)
1024                 write_srom_word(db, i, eeprom[i]);
1025 }
1026 #endif
1027
1028
1029 /*
1030  *  Calculate the CRC valude of the Rx packet
1031  *  flag = 1 : return the reverse CRC (for the received packet CRC)
1032  *         0 : return the normal CRC (for Hash Table index)
1033  */
1034
1035 static unsigned long
1036 cal_CRC(unsigned char *Data, unsigned int Len, u8 flag)
1037 {
1038
1039        u32 crc = ether_crc_le(Len, Data);
1040
1041        if (flag)
1042                return ~crc;
1043
1044        return crc;
1045 }
1046
1047 /*
1048  *  Set DM9000 multicast address
1049  */
1050 static void
1051 dm9000_hash_table(struct net_device *dev)
1052 {
1053         board_info_t *db = (board_info_t *) dev->priv;
1054         struct dev_mc_list *mcptr = dev->mc_list;
1055         int mc_cnt = dev->mc_count;
1056         u32 hash_val;
1057         u16 i, oft, hash_table[4];
1058         unsigned long flags;
1059
1060         PRINTK2("dm9000_hash_table()\n");
1061
1062         spin_lock_irqsave(&db->lock,flags);
1063
1064         for (i = 0, oft = 0x10; i < 6; i++, oft++)
1065                 iow(db, oft, dev->dev_addr[i]);
1066
1067         /* Clear Hash Table */
1068         for (i = 0; i < 4; i++)
1069                 hash_table[i] = 0x0;
1070
1071         /* broadcast address */
1072         hash_table[3] = 0x8000;
1073
1074         /* the multicast address in Hash Table : 64 bits */
1075         for (i = 0; i < mc_cnt; i++, mcptr = mcptr->next) {
1076                 hash_val = cal_CRC((char *) mcptr->dmi_addr, 6, 0) & 0x3f;
1077                 hash_table[hash_val / 16] |= (u16) 1 << (hash_val % 16);
1078         }
1079
1080         /* Write the hash table to MAC MD table */
1081         for (i = 0, oft = 0x16; i < 4; i++) {
1082                 iow(db, oft++, hash_table[i] & 0xff);
1083                 iow(db, oft++, (hash_table[i] >> 8) & 0xff);
1084         }
1085
1086         spin_unlock_irqrestore(&db->lock,flags);
1087 }
1088
1089
1090 /*
1091  *   Read a word from phyxcer
1092  */
1093 static int
1094 dm9000_phy_read(struct net_device *dev, int phy_reg_unused, int reg)
1095 {
1096         board_info_t *db = (board_info_t *) dev->priv;
1097         unsigned long flags;
1098         unsigned int reg_save;
1099         int ret;
1100
1101         spin_lock_irqsave(&db->lock,flags);
1102
1103         /* Save previous register address */
1104         reg_save = readb(db->io_addr);
1105
1106         /* Fill the phyxcer register into REG_0C */
1107         iow(db, DM9000_EPAR, DM9000_PHY | reg);
1108
1109         iow(db, DM9000_EPCR, 0xc);      /* Issue phyxcer read command */
1110         udelay(100);            /* Wait read complete */
1111         iow(db, DM9000_EPCR, 0x0);      /* Clear phyxcer read command */
1112
1113         /* The read data keeps on REG_0D & REG_0E */
1114         ret = (ior(db, DM9000_EPDRH) << 8) | ior(db, DM9000_EPDRL);
1115
1116         /* restore the previous address */
1117         writeb(reg_save, db->io_addr);
1118
1119         spin_unlock_irqrestore(&db->lock,flags);
1120
1121         return ret;
1122 }
1123
1124 /*
1125  *   Write a word to phyxcer
1126  */
1127 static void
1128 dm9000_phy_write(struct net_device *dev, int phyaddr_unused, int reg, int value)
1129 {
1130         board_info_t *db = (board_info_t *) dev->priv;
1131         unsigned long flags;
1132         unsigned long reg_save;
1133
1134         spin_lock_irqsave(&db->lock,flags);
1135
1136         /* Save previous register address */
1137         reg_save = readb(db->io_addr);
1138
1139         /* Fill the phyxcer register into REG_0C */
1140         iow(db, DM9000_EPAR, DM9000_PHY | reg);
1141
1142         /* Fill the written data into REG_0D & REG_0E */
1143         iow(db, DM9000_EPDRL, (value & 0xff));
1144         iow(db, DM9000_EPDRH, ((value >> 8) & 0xff));
1145
1146         iow(db, DM9000_EPCR, 0xa);      /* Issue phyxcer write command */
1147         udelay(500);            /* Wait write complete */
1148         iow(db, DM9000_EPCR, 0x0);      /* Clear phyxcer write command */
1149
1150         /* restore the previous address */
1151         writeb(reg_save, db->io_addr);
1152
1153         spin_unlock_irqrestore(&db->lock,flags);
1154 }
1155
1156 static int
1157 dm9000_drv_suspend(struct platform_device *dev, pm_message_t state)
1158 {
1159         struct net_device *ndev = platform_get_drvdata(dev);
1160
1161         if (ndev) {
1162                 if (netif_running(ndev)) {
1163                         netif_device_detach(ndev);
1164                         dm9000_shutdown(ndev);
1165                 }
1166         }
1167         return 0;
1168 }
1169
1170 static int
1171 dm9000_drv_resume(struct platform_device *dev)
1172 {
1173         struct net_device *ndev = platform_get_drvdata(dev);
1174         board_info_t *db = (board_info_t *) ndev->priv;
1175
1176         if (ndev) {
1177
1178                 if (netif_running(ndev)) {
1179                         dm9000_reset(db);
1180                         dm9000_init_dm9000(ndev);
1181
1182                         netif_device_attach(ndev);
1183                 }
1184         }
1185         return 0;
1186 }
1187
1188 static int
1189 dm9000_drv_remove(struct platform_device *pdev)
1190 {
1191         struct net_device *ndev = platform_get_drvdata(pdev);
1192
1193         platform_set_drvdata(pdev, NULL);
1194
1195         unregister_netdev(ndev);
1196         dm9000_release_board(pdev, (board_info_t *) ndev->priv);
1197         free_netdev(ndev);              /* free device structure */
1198
1199         PRINTK1("clean_module() exit\n");
1200
1201         return 0;
1202 }
1203
1204 static struct platform_driver dm9000_driver = {
1205         .driver = {
1206                 .name    = "dm9000",
1207                 .owner   = THIS_MODULE,
1208         },
1209         .probe   = dm9000_probe,
1210         .remove  = dm9000_drv_remove,
1211         .suspend = dm9000_drv_suspend,
1212         .resume  = dm9000_drv_resume,
1213 };
1214
1215 static int __init
1216 dm9000_init(void)
1217 {
1218         printk(KERN_INFO "%s Ethernet Driver\n", CARDNAME);
1219
1220         return platform_driver_register(&dm9000_driver);        /* search board and register */
1221 }
1222
1223 static void __exit
1224 dm9000_cleanup(void)
1225 {
1226         platform_driver_unregister(&dm9000_driver);
1227 }
1228
1229 module_init(dm9000_init);
1230 module_exit(dm9000_cleanup);
1231
1232 MODULE_AUTHOR("Sascha Hauer, Ben Dooks");
1233 MODULE_DESCRIPTION("Davicom DM9000 network driver");
1234 MODULE_LICENSE("GPL");