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