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   1 /*********************************************************************
   2  *
   3  * Filename:      nsc-ircc.c
   4  * Version:       1.0
   5  * Description:   Driver for the NSC PC'108 and PC'338 IrDA chipsets
   6  * Status:        Stable.
   7  * Author:        Dag Brattli <dagb@cs.uit.no>
   8  * Created at:    Sat Nov  7 21:43:15 1998
   9  * Modified at:   Wed Mar  1 11:29:34 2000
  10  * Modified by:   Dag Brattli <dagb@cs.uit.no>
  11  *
  12  *     Copyright (c) 1998-2000 Dag Brattli <dagb@cs.uit.no>
  13  *     Copyright (c) 1998 Lichen Wang, <lwang@actisys.com>
  14  *     Copyright (c) 1998 Actisys Corp., www.actisys.com
  15  *     Copyright (c) 2000-2004 Jean Tourrilhes <jt@hpl.hp.com>
  16  *     All Rights Reserved
  17  *
  18  *     This program is free software; you can redistribute it and/or
  19  *     modify it under the terms of the GNU General Public License as
  20  *     published by the Free Software Foundation; either version 2 of
  21  *     the License, or (at your option) any later version.
  22  *
  23  *     Neither Dag Brattli nor University of Tromsø admit liability nor
  24  *     provide warranty for any of this software. This material is
  25  *     provided "AS-IS" and at no charge.
  26  *
  27  *     Notice that all functions that needs to access the chip in _any_
  28  *     way, must save BSR register on entry, and restore it on exit.
  29  *     It is _very_ important to follow this policy!
  30  *
  31  *         __u8 bank;
  32  *
  33  *         bank = inb(iobase+BSR);
  34  *
  35  *         do_your_stuff_here();
  36  *
  37  *         outb(bank, iobase+BSR);
  38  *
  39  *    If you find bugs in this file, its very likely that the same bug
  40  *    will also be in w83977af_ir.c since the implementations are quite
  41  *    similar.
  42  *
  43  ********************************************************************/
  44
  45 #include <linux/module.h>
  46
  47 #include <linux/kernel.h>
  48 #include <linux/types.h>
  49 #include <linux/skbuff.h>
  50 #include <linux/netdevice.h>
  51 #include <linux/ioport.h>
  52 #include <linux/delay.h>
  53 #include <linux/slab.h>
  54 #include <linux/init.h>
  55 #include <linux/rtnetlink.h>
  56 #include <linux/dma-mapping.h>
  57 #include <linux/pnp.h>
  58 #include <linux/platform_device.h>
  59
  60 #include <asm/io.h>
  61 #include <asm/dma.h>
  62 #include <asm/byteorder.h>
  63
  64 #include <net/irda/wrapper.h>
  65 #include <net/irda/irda.h>
  66 #include <net/irda/irda_device.h>
  67
  68 #include "nsc-ircc.h"
  69
  70 #define CHIP_IO_EXTENT 8
  71 #define BROKEN_DONGLE_ID
  72
  73 static char *driver_name = "nsc-ircc";
  74
  75 /* Power Management */
  76 #define NSC_IRCC_DRIVER_NAME                  "nsc-ircc"
  77 static int nsc_ircc_suspend(struct platform_device *dev, pm_message_t state);
  78 static int nsc_ircc_resume(struct platform_device *dev);
  79
  80 static struct platform_driver nsc_ircc_driver = {
  81         .suspend        = nsc_ircc_suspend,
  82         .resume         = nsc_ircc_resume,
  83         .driver         = {
  84                 .name   = NSC_IRCC_DRIVER_NAME,
  85         },
  86 };
  87
  88 /* Module parameters */
  89 static int qos_mtt_bits = 0x07;  /* 1 ms or more */
  90 static int dongle_id;
  91
  92 /* Use BIOS settions by default, but user may supply module parameters */
  93 static unsigned int io[]  = { ~0, ~0, ~0, ~0, ~0 };
  94 static unsigned int irq[] = {  0,  0,  0,  0,  0 };
  95 static unsigned int dma[] = {  0,  0,  0,  0,  0 };
  96
  97 static int nsc_ircc_probe_108(nsc_chip_t *chip, chipio_t *info);
  98 static int nsc_ircc_probe_338(nsc_chip_t *chip, chipio_t *info);
  99 static int nsc_ircc_probe_39x(nsc_chip_t *chip, chipio_t *info);
 100 static int nsc_ircc_init_108(nsc_chip_t *chip, chipio_t *info);
 101 static int nsc_ircc_init_338(nsc_chip_t *chip, chipio_t *info);
 102 static int nsc_ircc_init_39x(nsc_chip_t *chip, chipio_t *info);
 103 #ifdef CONFIG_PNP
 104 static int nsc_ircc_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *id);
 105 #endif
 106
 107 /* These are the known NSC chips */
 108 static nsc_chip_t chips[] = {
 109 /*  Name, {cfg registers}, chip id index reg, chip id expected value, revision mask */
 110         { "PC87108", { 0x150, 0x398, 0xea }, 0x05, 0x10, 0xf0,
 111           nsc_ircc_probe_108, nsc_ircc_init_108 },
 112         { "PC87338", { 0x398, 0x15c, 0x2e }, 0x08, 0xb0, 0xf8,
 113           nsc_ircc_probe_338, nsc_ircc_init_338 },
 114         /* Contributed by Steffen Pingel - IBM X40 */
 115         { "PC8738x", { 0x164e, 0x4e, 0x2e }, 0x20, 0xf4, 0xff,
 116           nsc_ircc_probe_39x, nsc_ircc_init_39x },
 117         /* Contributed by Jan Frey - IBM A30/A31 */
 118         { "PC8739x", { 0x2e, 0x4e, 0x0 }, 0x20, 0xea, 0xff,
 119           nsc_ircc_probe_39x, nsc_ircc_init_39x },
 120         /* IBM ThinkPads using PC8738x (T60/X60/Z60) */
 121         { "IBM-PC8738x", { 0x2e, 0x4e, 0x0 }, 0x20, 0xf4, 0xff,
 122           nsc_ircc_probe_39x, nsc_ircc_init_39x },
 123         /* IBM ThinkPads using PC8394T (T43/R52/?) */
 124         { "IBM-PC8394T", { 0x2e, 0x4e, 0x0 }, 0x20, 0xf9, 0xff,
 125           nsc_ircc_probe_39x, nsc_ircc_init_39x },
 126         { NULL }
 127 };
 128
 129 static struct nsc_ircc_cb *dev_self[] = { NULL, NULL, NULL, NULL, NULL };
 130
 131 static char *dongle_types[] = {
 132         "Differential serial interface",
 133         "Differential serial interface",
 134         "Reserved",
 135         "Reserved",
 136         "Sharp RY5HD01",
 137         "Reserved",
 138         "Single-ended serial interface",
 139         "Consumer-IR only",
 140         "HP HSDL-2300, HP HSDL-3600/HSDL-3610",
 141         "IBM31T1100 or Temic TFDS6000/TFDS6500",
 142         "Reserved",
 143         "Reserved",
 144         "HP HSDL-1100/HSDL-2100",
 145         "HP HSDL-1100/HSDL-2100",
 146         "Supports SIR Mode only",
 147         "No dongle connected",
 148 };
 149
 150 /* PNP probing */
 151 static chipio_t pnp_info;
 152 static const struct pnp_device_id nsc_ircc_pnp_table[] = {
 153         { .id = "NSC6001", .driver_data = 0 },
 154         { .id = "HWPC224", .driver_data = 0 },
 155         { .id = "IBM0071", .driver_data = NSC_FORCE_DONGLE_TYPE9 },
 156         { }
 157 };
 158
 159 MODULE_DEVICE_TABLE(pnp, nsc_ircc_pnp_table);
 160
 161 static struct pnp_driver nsc_ircc_pnp_driver = {
 162 #ifdef CONFIG_PNP
 163         .name = "nsc-ircc",
 164         .id_table = nsc_ircc_pnp_table,
 165         .probe = nsc_ircc_pnp_probe,
 166 #endif
 167 };
 168
 169 /* Some prototypes */
 170 static int  nsc_ircc_open(chipio_t *info);
 171 static int  nsc_ircc_close(struct nsc_ircc_cb *self);
 172 static int  nsc_ircc_setup(chipio_t *info);
 173 static void nsc_ircc_pio_receive(struct nsc_ircc_cb *self);
 174 static int  nsc_ircc_dma_receive(struct nsc_ircc_cb *self);
 175 static int  nsc_ircc_dma_receive_complete(struct nsc_ircc_cb *self, int iobase);
 176 static int  nsc_ircc_hard_xmit_sir(struct sk_buff *skb, struct net_device *dev);
 177 static int  nsc_ircc_hard_xmit_fir(struct sk_buff *skb, struct net_device *dev);
 178 static int  nsc_ircc_pio_write(int iobase, __u8 *buf, int len, int fifo_size);
 179 static void nsc_ircc_dma_xmit(struct nsc_ircc_cb *self, int iobase);
 180 static __u8 nsc_ircc_change_speed(struct nsc_ircc_cb *self, __u32 baud);
 181 static int  nsc_ircc_is_receiving(struct nsc_ircc_cb *self);
 182 static int  nsc_ircc_read_dongle_id (int iobase);
 183 static void nsc_ircc_init_dongle_interface (int iobase, int dongle_id);
 184
 185 static int  nsc_ircc_net_open(struct net_device *dev);
 186 static int  nsc_ircc_net_close(struct net_device *dev);
 187 static int  nsc_ircc_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 188
 189 /* Globals */
 190 static int pnp_registered;
 191 static int pnp_succeeded;
 192
 193 /*
 194  * Function nsc_ircc_init ()
 195  *
 196  *    Initialize chip. Just try to find out how many chips we are dealing with
 197  *    and where they are
 198  */
 199 static int __init nsc_ircc_init(void)
 200 {
 201         chipio_t info;
 202         nsc_chip_t *chip;
 203         int ret;
 204         int cfg_base;
 205         int cfg, id;
 206         int reg;
 207         int i = 0;
 208
 209         ret = platform_driver_register(&nsc_ircc_driver);
 210         if (ret) {
 211                 IRDA_ERROR("%s, Can't register driver!\n", driver_name);
 212                 return ret;
 213         }
 214
 215         /* Register with PnP subsystem to detect disable ports */
 216         ret = pnp_register_driver(&nsc_ircc_pnp_driver);
 217
 218         if (!ret)
 219                 pnp_registered = 1;
 220
 221         ret = -ENODEV;
 222
 223         /* Probe for all the NSC chipsets we know about */
 224         for (chip = chips; chip->name ; chip++) {
 225                 IRDA_DEBUG(2, "%s(), Probing for %s ...\n", __func__,
 226                            chip->name);
 227
 228                 /* Try all config registers for this chip */
 229                 for (cfg = 0; cfg < ARRAY_SIZE(chip->cfg); cfg++) {
 230                         cfg_base = chip->cfg[cfg];
 231                         if (!cfg_base)
 232                                 continue;
 233
 234                         /* Read index register */
 235                         reg = inb(cfg_base);
 236                         if (reg == 0xff) {
 237                                 IRDA_DEBUG(2, "%s() no chip at 0x%03x\n", __func__, cfg_base);
 238                                 continue;
 239                         }
 240
 241                         /* Read chip identification register */
 242                         outb(chip->cid_index, cfg_base);
 243                         id = inb(cfg_base+1);
 244                         if ((id & chip->cid_mask) == chip->cid_value) {
 245                                 IRDA_DEBUG(2, "%s() Found %s chip, revision=%d\n",
 246                                            __func__, chip->name, id & ~chip->cid_mask);
 247
 248                                 /*
 249                                  * If we found a correct PnP setting,
 250                                  * we first try it.
 251                                  */
 252                                 if (pnp_succeeded) {
 253                                         memset(&info, 0, sizeof(chipio_t));
 254                                         info.cfg_base = cfg_base;
 255                                         info.fir_base = pnp_info.fir_base;
 256                                         info.dma = pnp_info.dma;
 257                                         info.irq = pnp_info.irq;
 258
 259                                         if (info.fir_base < 0x2000) {
 260                                                 IRDA_MESSAGE("%s, chip->init\n", driver_name);
 261                                                 chip->init(chip, &info);
 262                                         } else
 263                                                 chip->probe(chip, &info);
 264
 265                                         if (nsc_ircc_open(&info) >= 0)
 266                                                 ret = 0;
 267                                 }
 268
 269                                 /*
 270                                  * Opening based on PnP values failed.
 271                                  * Let's fallback to user values, or probe
 272                                  * the chip.
 273                                  */
 274                                 if (ret) {
 275                                         IRDA_DEBUG(2, "%s, PnP init failed\n", driver_name);
 276                                         memset(&info, 0, sizeof(chipio_t));
 277                                         info.cfg_base = cfg_base;
 278                                         info.fir_base = io[i];
 279                                         info.dma = dma[i];
 280                                         info.irq = irq[i];
 281
 282                                         /*
 283                                          * If the user supplies the base address, then
 284                                          * we init the chip, if not we probe the values
 285                                          * set by the BIOS
 286                                          */
 287                                         if (io[i] < 0x2000) {
 288                                                 chip->init(chip, &info);
 289                                         } else
 290                                                 chip->probe(chip, &info);
 291
 292                                         if (nsc_ircc_open(&info) >= 0)
 293                                                 ret = 0;
 294                                 }
 295                                 i++;
 296                         } else {
 297                                 IRDA_DEBUG(2, "%s(), Wrong chip id=0x%02x\n", __func__, id);
 298                         }
 299                 }
 300         }
 301
 302         if (ret) {
 303                 platform_driver_unregister(&nsc_ircc_driver);
 304                 pnp_unregister_driver(&nsc_ircc_pnp_driver);
 305                 pnp_registered = 0;
 306         }
 307
 308         return ret;
 309 }
 310
 311 /*
 312  * Function nsc_ircc_cleanup ()
 313  *
 314  *    Close all configured chips
 315  *
 316  */
 317 static void __exit nsc_ircc_cleanup(void)
 318 {
 319         int i;
 320
 321         for (i = 0; i < ARRAY_SIZE(dev_self); i++) {
 322                 if (dev_self[i])
 323                         nsc_ircc_close(dev_self[i]);
 324         }
 325
 326         platform_driver_unregister(&nsc_ircc_driver);
 327
 328         if (pnp_registered)
 329                 pnp_unregister_driver(&nsc_ircc_pnp_driver);
 330
 331         pnp_registered = 0;
 332 }
 333
 334 /*
 335  * Function nsc_ircc_open (iobase, irq)
 336  *
 337  *    Open driver instance
 338  *
 339  */
 340 static int __init nsc_ircc_open(chipio_t *info)
 341 {
 342         struct net_device *dev;
 343         struct nsc_ircc_cb *self;
 344         void *ret;
 345         int err, chip_index;
 346
 347         IRDA_DEBUG(2, "%s()\n", __func__);
 348
 349
 350         for (chip_index = 0; chip_index < ARRAY_SIZE(dev_self); chip_index++) {
 351                 if (!dev_self[chip_index])
 352                         break;
 353         }
 354
 355         if (chip_index == ARRAY_SIZE(dev_self)) {
 356                 IRDA_ERROR("%s(), maximum number of supported chips reached!\n", __func__);
 357                 return -ENOMEM;
 358         }
 359
 360         IRDA_MESSAGE("%s, Found chip at base=0x%03x\n", driver_name,
 361                      info->cfg_base);
 362
 363         if ((nsc_ircc_setup(info)) == -1)
 364                 return -1;
 365
 366         IRDA_MESSAGE("%s, driver loaded (Dag Brattli)\n", driver_name);
 367
 368         dev = alloc_irdadev(sizeof(struct nsc_ircc_cb));
 369         if (dev == NULL) {
 370                 IRDA_ERROR("%s(), can't allocate memory for "
 371                            "control block!\n", __func__);
 372                 return -ENOMEM;
 373         }
 374
 375         self = netdev_priv(dev);
 376         self->netdev = dev;
 377         spin_lock_init(&self->lock);
 378
 379         /* Need to store self somewhere */
 380         dev_self[chip_index] = self;
 381         self->index = chip_index;
 382
 383         /* Initialize IO */
 384         self->io.cfg_base  = info->cfg_base;
 385         self->io.fir_base  = info->fir_base;
 386         self->io.irq       = info->irq;
 387         self->io.fir_ext   = CHIP_IO_EXTENT;
 388         self->io.dma       = info->dma;
 389         self->io.fifo_size = 32;
 390
 391         /* Reserve the ioports that we need */
 392         ret = request_region(self->io.fir_base, self->io.fir_ext, driver_name);
 393         if (!ret) {
 394                 IRDA_WARNING("%s(), can't get iobase of 0x%03x\n",
 395                              __func__, self->io.fir_base);
 396                 err = -ENODEV;
 397                 goto out1;
 398         }
 399
 400         /* Initialize QoS for this device */
 401         irda_init_max_qos_capabilies(&self->qos);
 402
 403         /* The only value we must override it the baudrate */
 404         self->qos.baud_rate.bits = IR_9600|IR_19200|IR_38400|IR_57600|
 405                 IR_115200|IR_576000|IR_1152000 |(IR_4000000 << 8);
 406
 407         self->qos.min_turn_time.bits = qos_mtt_bits;
 408         irda_qos_bits_to_value(&self->qos);
 409
 410         /* Max DMA buffer size needed = (data_size + 6) * (window_size) + 6; */
 411         self->rx_buff.truesize = 14384;
 412         self->tx_buff.truesize = 14384;
 413
 414         /* Allocate memory if needed */
 415         self->rx_buff.head =
 416                 dma_alloc_coherent(NULL, self->rx_buff.truesize,
 417                                    &self->rx_buff_dma, GFP_KERNEL);
 418         if (self->rx_buff.head == NULL) {
 419                 err = -ENOMEM;
 420                 goto out2;
 421
 422         }
 423         memset(self->rx_buff.head, 0, self->rx_buff.truesize);
 424
 425         self->tx_buff.head =
 426                 dma_alloc_coherent(NULL, self->tx_buff.truesize,
 427                                    &self->tx_buff_dma, GFP_KERNEL);
 428         if (self->tx_buff.head == NULL) {
 429                 err = -ENOMEM;
 430                 goto out3;
 431         }
 432         memset(self->tx_buff.head, 0, self->tx_buff.truesize);
 433
 434         self->rx_buff.in_frame = FALSE;
 435         self->rx_buff.state = OUTSIDE_FRAME;
 436         self->tx_buff.data = self->tx_buff.head;
 437         self->rx_buff.data = self->rx_buff.head;
 438
 439         /* Reset Tx queue info */
 440         self->tx_fifo.len = self->tx_fifo.ptr = self->tx_fifo.free = 0;
 441         self->tx_fifo.tail = self->tx_buff.head;
 442
 443         /* Override the network functions we need to use */
 444         dev->hard_start_xmit = nsc_ircc_hard_xmit_sir;
 445         dev->open            = nsc_ircc_net_open;
 446         dev->stop            = nsc_ircc_net_close;
 447         dev->do_ioctl        = nsc_ircc_net_ioctl;
 448
 449         err = register_netdev(dev);
 450         if (err) {
 451                 IRDA_ERROR("%s(), register_netdev() failed!\n", __func__);
 452                 goto out4;
 453         }
 454         IRDA_MESSAGE("IrDA: Registered device %s\n", dev->name);
 455
 456         /* Check if user has supplied a valid dongle id or not */
 457         if ((dongle_id <= 0) ||
 458             (dongle_id >= ARRAY_SIZE(dongle_types))) {
 459                 dongle_id = nsc_ircc_read_dongle_id(self->io.fir_base);
 460
 461                 IRDA_MESSAGE("%s, Found dongle: %s\n", driver_name,
 462                              dongle_types[dongle_id]);
 463         } else {
 464                 IRDA_MESSAGE("%s, Using dongle: %s\n", driver_name,
 465                              dongle_types[dongle_id]);
 466         }
 467
 468         self->io.dongle_id = dongle_id;
 469         nsc_ircc_init_dongle_interface(self->io.fir_base, dongle_id);
 470
 471         self->pldev = platform_device_register_simple(NSC_IRCC_DRIVER_NAME,
 472                                                       self->index, NULL, 0);
 473         if (IS_ERR(self->pldev)) {
 474                 err = PTR_ERR(self->pldev);
 475                 goto out5;
 476         }
 477         platform_set_drvdata(self->pldev, self);
 478
 479         return chip_index;
 480
 481  out5:
 482         unregister_netdev(dev);
 483  out4:
 484         dma_free_coherent(NULL, self->tx_buff.truesize,
 485                           self->tx_buff.head, self->tx_buff_dma);
 486  out3:
 487         dma_free_coherent(NULL, self->rx_buff.truesize,
 488                           self->rx_buff.head, self->rx_buff_dma);
 489  out2:
 490         release_region(self->io.fir_base, self->io.fir_ext);
 491  out1:
 492         free_netdev(dev);
 493         dev_self[chip_index] = NULL;
 494         return err;
 495 }
 496
 497 /*
 498  * Function nsc_ircc_close (self)
 499  *
 500  *    Close driver instance
 501  *
 502  */
 503 static int __exit nsc_ircc_close(struct nsc_ircc_cb *self)
 504 {
 505         int iobase;
 506
 507         IRDA_DEBUG(4, "%s()\n", __func__);
 508
 509         IRDA_ASSERT(self != NULL, return -1;);
 510
 511         iobase = self->io.fir_base;
 512
 513         platform_device_unregister(self->pldev);
 514
 515         /* Remove netdevice */
 516         unregister_netdev(self->netdev);
 517
 518         /* Release the PORT that this driver is using */
 519         IRDA_DEBUG(4, "%s(), Releasing Region %03x\n",
 520                    __func__, self->io.fir_base);
 521         release_region(self->io.fir_base, self->io.fir_ext);
 522
 523         if (self->tx_buff.head)
 524                 dma_free_coherent(NULL, self->tx_buff.truesize,
 525                                   self->tx_buff.head, self->tx_buff_dma);
 526
 527         if (self->rx_buff.head)
 528                 dma_free_coherent(NULL, self->rx_buff.truesize,
 529                                   self->rx_buff.head, self->rx_buff_dma);
 530
 531         dev_self[self->index] = NULL;
 532         free_netdev(self->netdev);
 533
 534         return 0;
 535 }
 536
 537 /*
 538  * Function nsc_ircc_init_108 (iobase, cfg_base, irq, dma)
 539  *
 540  *    Initialize the NSC '108 chip
 541  *
 542  */
 543 static int nsc_ircc_init_108(nsc_chip_t *chip, chipio_t *info)
 544 {
 545         int cfg_base = info->cfg_base;
 546         __u8 temp=0;
 547
 548         outb(2, cfg_base);      /* Mode Control Register (MCTL) */
 549         outb(0x00, cfg_base+1); /* Disable device */
 550
 551         /* Base Address and Interrupt Control Register (BAIC) */
 552         outb(CFG_108_BAIC, cfg_base);
 553         switch (info->fir_base) {
 554         case 0x3e8: outb(0x14, cfg_base+1); break;
 555         case 0x2e8: outb(0x15, cfg_base+1); break;
 556         case 0x3f8: outb(0x16, cfg_base+1); break;
 557         case 0x2f8: outb(0x17, cfg_base+1); break;
 558         default: IRDA_ERROR("%s(), invalid base_address", __func__);
 559         }
 560
 561         /* Control Signal Routing Register (CSRT) */
 562         switch (info->irq) {
 563         case 3:  temp = 0x01; break;
 564         case 4:  temp = 0x02; break;
 565         case 5:  temp = 0x03; break;
 566         case 7:  temp = 0x04; break;
 567         case 9:  temp = 0x05; break;
 568         case 11: temp = 0x06; break;
 569         case 15: temp = 0x07; break;
 570         default: IRDA_ERROR("%s(), invalid irq", __func__);
 571         }
 572         outb(CFG_108_CSRT, cfg_base);
 573
 574         switch (info->dma) {
 575         case 0: outb(0x08+temp, cfg_base+1); break;
 576         case 1: outb(0x10+temp, cfg_base+1); break;
 577         case 3: outb(0x18+temp, cfg_base+1); break;
 578         default: IRDA_ERROR("%s(), invalid dma", __func__);
 579         }
 580
 581         outb(CFG_108_MCTL, cfg_base);      /* Mode Control Register (MCTL) */
 582         outb(0x03, cfg_base+1); /* Enable device */
 583
 584         return 0;
 585 }
 586
 587 /*
 588  * Function nsc_ircc_probe_108 (chip, info)
 589  *
 590  *
 591  *
 592  */
 593 static int nsc_ircc_probe_108(nsc_chip_t *chip, chipio_t *info)
 594 {
 595         int cfg_base = info->cfg_base;
 596         int reg;
 597
 598         /* Read address and interrupt control register (BAIC) */
 599         outb(CFG_108_BAIC, cfg_base);
 600         reg = inb(cfg_base+1);
 601
 602         switch (reg & 0x03) {
 603         case 0:
 604                 info->fir_base = 0x3e8;
 605                 break;
 606         case 1:
 607                 info->fir_base = 0x2e8;
 608                 break;
 609         case 2:
 610                 info->fir_base = 0x3f8;
 611                 break;
 612         case 3:
 613                 info->fir_base = 0x2f8;
 614                 break;
 615         }
 616         info->sir_base = info->fir_base;
 617         IRDA_DEBUG(2, "%s(), probing fir_base=0x%03x\n", __func__,
 618                    info->fir_base);
 619
 620         /* Read control signals routing register (CSRT) */
 621         outb(CFG_108_CSRT, cfg_base);
 622         reg = inb(cfg_base+1);
 623
 624         switch (reg & 0x07) {
 625         case 0:
 626                 info->irq = -1;
 627                 break;
 628         case 1:
 629                 info->irq = 3;
 630                 break;
 631         case 2:
 632                 info->irq = 4;
 633                 break;
 634         case 3:
 635                 info->irq = 5;
 636                 break;
 637         case 4:
 638                 info->irq = 7;
 639                 break;
 640         case 5:
 641                 info->irq = 9;
 642                 break;
 643         case 6:
 644                 info->irq = 11;
 645                 break;
 646         case 7:
 647                 info->irq = 15;
 648                 break;
 649         }
 650         IRDA_DEBUG(2, "%s(), probing irq=%d\n", __func__, info->irq);
 651
 652         /* Currently we only read Rx DMA but it will also be used for Tx */
 653         switch ((reg >> 3) & 0x03) {
 654         case 0:
 655                 info->dma = -1;
 656                 break;
 657         case 1:
 658                 info->dma = 0;
 659                 break;
 660         case 2:
 661                 info->dma = 1;
 662                 break;
 663         case 3:
 664                 info->dma = 3;
 665                 break;
 666         }
 667         IRDA_DEBUG(2, "%s(), probing dma=%d\n", __func__, info->dma);
 668
 669         /* Read mode control register (MCTL) */
 670         outb(CFG_108_MCTL, cfg_base);
 671         reg = inb(cfg_base+1);
 672
 673         info->enabled = reg & 0x01;
 674         info->suspended = !((reg >> 1) & 0x01);
 675
 676         return 0;
 677 }
 678
 679 /*
 680  * Function nsc_ircc_init_338 (chip, info)
 681  *
 682  *    Initialize the NSC '338 chip. Remember that the 87338 needs two
 683  *    consecutive writes to the data registers while CPU interrupts are
 684  *    disabled. The 97338 does not require this, but shouldn't be any
 685  *    harm if we do it anyway.
 686  */
 687 static int nsc_ircc_init_338(nsc_chip_t *chip, chipio_t *info)
 688 {
 689         /* No init yet */
 690
 691         return 0;
 692 }
 693
 694 /*
 695  * Function nsc_ircc_probe_338 (chip, info)
 696  *
 697  *
 698  *
 699  */
 700 static int nsc_ircc_probe_338(nsc_chip_t *chip, chipio_t *info)
 701 {
 702         int cfg_base = info->cfg_base;
 703         int reg, com = 0;
 704         int pnp;
 705
 706         /* Read funtion enable register (FER) */
 707         outb(CFG_338_FER, cfg_base);
 708         reg = inb(cfg_base+1);
 709
 710         info->enabled = (reg >> 2) & 0x01;
 711
 712         /* Check if we are in Legacy or PnP mode */
 713         outb(CFG_338_PNP0, cfg_base);
 714         reg = inb(cfg_base+1);
 715
 716         pnp = (reg >> 3) & 0x01;
 717         if (pnp) {
 718                 IRDA_DEBUG(2, "(), Chip is in PnP mode\n");
 719                 outb(0x46, cfg_base);
 720                 reg = (inb(cfg_base+1) & 0xfe) << 2;
 721
 722                 outb(0x47, cfg_base);
 723                 reg |= ((inb(cfg_base+1) & 0xfc) << 8);
 724
 725                 info->fir_base = reg;
 726         } else {
 727                 /* Read function address register (FAR) */
 728                 outb(CFG_338_FAR, cfg_base);
 729                 reg = inb(cfg_base+1);
 730
 731                 switch ((reg >> 4) & 0x03) {
 732                 case 0:
 733                         info->fir_base = 0x3f8;
 734                         break;
 735                 case 1:
 736                         info->fir_base = 0x2f8;
 737                         break;
 738                 case 2:
 739                         com = 3;
 740                         break;
 741                 case 3:
 742                         com = 4;
 743                         break;
 744                 }
 745
 746                 if (com) {
 747                         switch ((reg >> 6) & 0x03) {
 748                         case 0:
 749                                 if (com == 3)
 750                                         info->fir_base = 0x3e8;
 751                                 else
 752                                         info->fir_base = 0x2e8;
 753                                 break;
 754                         case 1:
 755                                 if (com == 3)
 756                                         info->fir_base = 0x338;
 757                                 else
 758                                         info->fir_base = 0x238;
 759                                 break;
 760                         case 2:
 761                                 if (com == 3)
 762                                         info->fir_base = 0x2e8;
 763                                 else
 764                                         info->fir_base = 0x2e0;
 765                                 break;
 766                         case 3:
 767                                 if (com == 3)
 768                                         info->fir_base = 0x220;
 769                                 else
 770                                         info->fir_base = 0x228;
 771                                 break;
 772                         }
 773                 }
 774         }
 775         info->sir_base = info->fir_base;
 776
 777         /* Read PnP register 1 (PNP1) */
 778         outb(CFG_338_PNP1, cfg_base);
 779         reg = inb(cfg_base+1);
 780
 781         info->irq = reg >> 4;
 782
 783         /* Read PnP register 3 (PNP3) */
 784         outb(CFG_338_PNP3, cfg_base);
 785         reg = inb(cfg_base+1);
 786
 787         info->dma = (reg & 0x07) - 1;
 788
 789         /* Read power and test register (PTR) */
 790         outb(CFG_338_PTR, cfg_base);
 791         reg = inb(cfg_base+1);
 792
 793         info->suspended = reg & 0x01;
 794
 795         return 0;
 796 }
 797
 798
 799 /*
 800  * Function nsc_ircc_init_39x (chip, info)
 801  *
 802  *    Now that we know it's a '39x (see probe below), we need to
 803  *    configure it so we can use it.
 804  *
 805  * The NSC '338 chip is a Super I/O chip with a "bank" architecture,
 806  * the configuration of the different functionality (serial, parallel,
 807  * floppy...) are each in a different bank (Logical Device Number).
 808  * The base address, irq and dma configuration registers are common
 809  * to all functionalities (index 0x30 to 0x7F).
 810  * There is only one configuration register specific to the
 811  * serial port, CFG_39X_SPC.
 812  * JeanII
 813  *
 814  * Note : this code was written by Jan Frey <janfrey@web.de>
 815  */
 816 static int nsc_ircc_init_39x(nsc_chip_t *chip, chipio_t *info)
 817 {
 818         int cfg_base = info->cfg_base;
 819         int enabled;
 820
 821         /* User is sure about his config... accept it. */
 822         IRDA_DEBUG(2, "%s(): nsc_ircc_init_39x (user settings): "
 823                    "io=0x%04x, irq=%d, dma=%d\n",
 824                    __func__, info->fir_base, info->irq, info->dma);
 825
 826         /* Access bank for SP2 */
 827         outb(CFG_39X_LDN, cfg_base);
 828         outb(0x02, cfg_base+1);
 829
 830         /* Configure SP2 */
 831
 832         /* We want to enable the device if not enabled */
 833         outb(CFG_39X_ACT, cfg_base);
 834         enabled = inb(cfg_base+1) & 0x01;
 835
 836         if (!enabled) {
 837                 /* Enable the device */
 838                 outb(CFG_39X_SIOCF1, cfg_base);
 839                 outb(0x01, cfg_base+1);
 840                 /* May want to update info->enabled. Jean II */
 841         }
 842
 843         /* Enable UART bank switching (bit 7) ; Sets the chip to normal
 844          * power mode (wake up from sleep mode) (bit 1) */
 845         outb(CFG_39X_SPC, cfg_base);
 846         outb(0x82, cfg_base+1);
 847
 848         return 0;
 849 }
 850
 851 /*
 852  * Function nsc_ircc_probe_39x (chip, info)
 853  *
 854  *    Test if we really have a '39x chip at the given address
 855  *
 856  * Note : this code was written by Jan Frey <janfrey@web.de>
 857  */
 858 static int nsc_ircc_probe_39x(nsc_chip_t *chip, chipio_t *info)
 859 {
 860         int cfg_base = info->cfg_base;
 861         int reg1, reg2, irq, irqt, dma1, dma2;
 862         int enabled, susp;
 863
 864         IRDA_DEBUG(2, "%s(), nsc_ircc_probe_39x, base=%d\n",
 865                    __func__, cfg_base);
 866
 867         /* This function should be executed with irq off to avoid
 868          * another driver messing with the Super I/O bank - Jean II */
 869
 870         /* Access bank for SP2 */
 871         outb(CFG_39X_LDN, cfg_base);
 872         outb(0x02, cfg_base+1);
 873
 874         /* Read infos about SP2 ; store in info struct */
 875         outb(CFG_39X_BASEH, cfg_base);
 876         reg1 = inb(cfg_base+1);
 877         outb(CFG_39X_BASEL, cfg_base);
 878         reg2 = inb(cfg_base+1);
 879         info->fir_base = (reg1 << 8) | reg2;
 880
 881         outb(CFG_39X_IRQNUM, cfg_base);
 882         irq = inb(cfg_base+1);
 883         outb(CFG_39X_IRQSEL, cfg_base);
 884         irqt = inb(cfg_base+1);
 885         info->irq = irq;
 886
 887         outb(CFG_39X_DMA0, cfg_base);
 888         dma1 = inb(cfg_base+1);
 889         outb(CFG_39X_DMA1, cfg_base);
 890         dma2 = inb(cfg_base+1);
 891         info->dma = dma1 -1;
 892
 893         outb(CFG_39X_ACT, cfg_base);
 894         info->enabled = enabled = inb(cfg_base+1) & 0x01;
 895
 896         outb(CFG_39X_SPC, cfg_base);
 897         susp = 1 - ((inb(cfg_base+1) & 0x02) >> 1);
 898
 899         IRDA_DEBUG(2, "%s(): io=0x%02x%02x, irq=%d (type %d), rxdma=%d, txdma=%d, enabled=%d (suspended=%d)\n", __func__, reg1,reg2,irq,irqt,dma1,dma2,enabled,susp);
 900
 901         /* Configure SP2 */
 902
 903         /* We want to enable the device if not enabled */
 904         outb(CFG_39X_ACT, cfg_base);
 905         enabled = inb(cfg_base+1) & 0x01;
 906
 907         if (!enabled) {
 908                 /* Enable the device */
 909                 outb(CFG_39X_SIOCF1, cfg_base);
 910                 outb(0x01, cfg_base+1);
 911                 /* May want to update info->enabled. Jean II */
 912         }
 913
 914         /* Enable UART bank switching (bit 7) ; Sets the chip to normal
 915          * power mode (wake up from sleep mode) (bit 1) */
 916         outb(CFG_39X_SPC, cfg_base);
 917         outb(0x82, cfg_base+1);
 918
 919         return 0;
 920 }
 921
 922 #ifdef CONFIG_PNP
 923 /* PNP probing */
 924 static int nsc_ircc_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *id)
 925 {
 926         memset(&pnp_info, 0, sizeof(chipio_t));
 927         pnp_info.irq = -1;
 928         pnp_info.dma = -1;
 929         pnp_succeeded = 1;
 930
 931         if (id->driver_data & NSC_FORCE_DONGLE_TYPE9)
 932                 dongle_id = 0x9;
 933
 934         /* There doesn't seem to be any way of getting the cfg_base.
 935          * On my box, cfg_base is in the PnP descriptor of the
 936          * motherboard. Oh well... Jean II */
 937
 938         if (pnp_port_valid(dev, 0) &&
 939                 !(pnp_port_flags(dev, 0) & IORESOURCE_DISABLED))
 940                 pnp_info.fir_base = pnp_port_start(dev, 0);
 941
 942         if (pnp_irq_valid(dev, 0) &&
 943                 !(pnp_irq_flags(dev, 0) & IORESOURCE_DISABLED))
 944                 pnp_info.irq = pnp_irq(dev, 0);
 945
 946         if (pnp_dma_valid(dev, 0) &&
 947                 !(pnp_dma_flags(dev, 0) & IORESOURCE_DISABLED))
 948                 pnp_info.dma = pnp_dma(dev, 0);
 949
 950         IRDA_DEBUG(0, "%s() : From PnP, found firbase 0x%03X ; irq %d ; dma %d.\n",
 951                    __func__, pnp_info.fir_base, pnp_info.irq, pnp_info.dma);
 952
 953         if((pnp_info.fir_base == 0) ||
 954            (pnp_info.irq == -1) || (pnp_info.dma == -1)) {
 955                 /* Returning an error will disable the device. Yuck ! */
 956                 //return -EINVAL;
 957                 pnp_succeeded = 0;
 958         }
 959
 960         return 0;
 961 }
 962 #endif
 963
 964 /*
 965  * Function nsc_ircc_setup (info)
 966  *
 967  *    Returns non-negative on success.
 968  *
 969  */
 970 static int nsc_ircc_setup(chipio_t *info)
 971 {
 972         int version;
 973         int iobase = info->fir_base;
 974
 975         /* Read the Module ID */
 976         switch_bank(iobase, BANK3);
 977         version = inb(iobase+MID);
 978
 979         IRDA_DEBUG(2, "%s() Driver %s Found chip version %02x\n",
 980                    __func__, driver_name, version);
 981
 982         /* Should be 0x2? */
 983         if (0x20 != (version & 0xf0)) {
 984                 IRDA_ERROR("%s, Wrong chip version %02x\n",
 985                            driver_name, version);
 986                 return -1;
 987         }
 988
 989         /* Switch to advanced mode */
 990         switch_bank(iobase, BANK2);
 991         outb(ECR1_EXT_SL, iobase+ECR1);
 992         switch_bank(iobase, BANK0);
 993
 994         /* Set FIFO threshold to TX17, RX16, reset and enable FIFO's */
 995         switch_bank(iobase, BANK0);
 996         outb(FCR_RXTH|FCR_TXTH|FCR_TXSR|FCR_RXSR|FCR_FIFO_EN, iobase+FCR);
 997
 998         outb(0x03, iobase+LCR);         /* 8 bit word length */
 999         outb(MCR_SIR, iobase+MCR);      /* Start at SIR-mode, also clears LSR*/
1000
1001         /* Set FIFO size to 32 */
1002         switch_bank(iobase, BANK2);
1003         outb(EXCR2_RFSIZ|EXCR2_TFSIZ, iobase+EXCR2);
1004
1005         /* IRCR2: FEND_MD is not set */
1006         switch_bank(iobase, BANK5);
1007         outb(0x02, iobase+4);
1008
1009         /* Make sure that some defaults are OK */
1010         switch_bank(iobase, BANK6);
1011         outb(0x20, iobase+0); /* Set 32 bits FIR CRC */
1012         outb(0x0a, iobase+1); /* Set MIR pulse width */
1013         outb(0x0d, iobase+2); /* Set SIR pulse width to 1.6us */
1014         outb(0x2a, iobase+4); /* Set beginning frag, and preamble length */
1015
1016         /* Enable receive interrupts */
1017         switch_bank(iobase, BANK0);
1018         outb(IER_RXHDL_IE, iobase+IER);
1019
1020         return 0;
1021 }
1022
1023 /*
1024  * Function nsc_ircc_read_dongle_id (void)
1025  *
1026  * Try to read dongle indentification. This procedure needs to be executed
1027  * once after power-on/reset. It also needs to be used whenever you suspect
1028  * that the user may have plugged/unplugged the IrDA Dongle.
1029  */
1030 static int nsc_ircc_read_dongle_id (int iobase)
1031 {
1032         int dongle_id;
1033         __u8 bank;
1034
1035         bank = inb(iobase+BSR);
1036
1037         /* Select Bank 7 */
1038         switch_bank(iobase, BANK7);
1039
1040         /* IRCFG4: IRSL0_DS and IRSL21_DS are cleared */
1041         outb(0x00, iobase+7);
1042
1043         /* ID0, 1, and 2 are pulled up/down very slowly */
1044         udelay(50);
1045
1046         /* IRCFG1: read the ID bits */
1047         dongle_id = inb(iobase+4) & 0x0f;
1048
1049 #ifdef BROKEN_DONGLE_ID
1050         if (dongle_id == 0x0a)
1051                 dongle_id = 0x09;
1052 #endif
1053         /* Go back to  bank 0 before returning */
1054         switch_bank(iobase, BANK0);
1055
1056         outb(bank, iobase+BSR);
1057
1058         return dongle_id;
1059 }
1060
1061 /*
1062  * Function nsc_ircc_init_dongle_interface (iobase, dongle_id)
1063  *
1064  *     This function initializes the dongle for the transceiver that is
1065  *     used. This procedure needs to be executed once after
1066  *     power-on/reset. It also needs to be used whenever you suspect that
1067  *     the dongle is changed.
1068  */
1069 static void nsc_ircc_init_dongle_interface (int iobase, int dongle_id)
1070 {
1071         int bank;
1072
1073         /* Save current bank */
1074         bank = inb(iobase+BSR);
1075
1076         /* Select Bank 7 */
1077         switch_bank(iobase, BANK7);
1078
1079         /* IRCFG4: set according to dongle_id */
1080         switch (dongle_id) {
1081         case 0x00: /* same as */
1082         case 0x01: /* Differential serial interface */
1083                 IRDA_DEBUG(0, "%s(), %s not defined by irda yet\n",
1084                            __func__, dongle_types[dongle_id]);
1085                 break;
1086         case 0x02: /* same as */
1087         case 0x03: /* Reserved */
1088                 IRDA_DEBUG(0, "%s(), %s not defined by irda yet\n",
1089                            __func__, dongle_types[dongle_id]);
1090                 break;
1091         case 0x04: /* Sharp RY5HD01 */
1092                 break;
1093         case 0x05: /* Reserved, but this is what the Thinkpad reports */
1094                 IRDA_DEBUG(0, "%s(), %s not defined by irda yet\n",
1095                            __func__, dongle_types[dongle_id]);
1096                 break;
1097         case 0x06: /* Single-ended serial interface */
1098                 IRDA_DEBUG(0, "%s(), %s not defined by irda yet\n",
1099                            __func__, dongle_types[dongle_id]);
1100                 break;
1101         case 0x07: /* Consumer-IR only */
1102                 IRDA_DEBUG(0, "%s(), %s is not for IrDA mode\n",
1103                            __func__, dongle_types[dongle_id]);
1104                 break;
1105         case 0x08: /* HP HSDL-2300, HP HSDL-3600/HSDL-3610 */
1106                 IRDA_DEBUG(0, "%s(), %s\n",
1107                            __func__, dongle_types[dongle_id]);
1108                 break;
1109         case 0x09: /* IBM31T1100 or Temic TFDS6000/TFDS6500 */
1110                 outb(0x28, iobase+7); /* Set irsl[0-2] as output */
1111                 break;
1112         case 0x0A: /* same as */
1113         case 0x0B: /* Reserved */
1114                 IRDA_DEBUG(0, "%s(), %s not defined by irda yet\n",
1115                            __func__, dongle_types[dongle_id]);
1116                 break;
1117         case 0x0C: /* same as */
1118         case 0x0D: /* HP HSDL-1100/HSDL-2100 */
1119                 /*
1120                  * Set irsl0 as input, irsl[1-2] as output, and separate
1121                  * inputs are used for SIR and MIR/FIR
1122                  */
1123                 outb(0x48, iobase+7);
1124                 break;
1125         case 0x0E: /* Supports SIR Mode only */
1126                 outb(0x28, iobase+7); /* Set irsl[0-2] as output */
1127                 break;
1128         case 0x0F: /* No dongle connected */
1129                 IRDA_DEBUG(0, "%s(), %s\n",
1130                            __func__, dongle_types[dongle_id]);
1131
1132                 switch_bank(iobase, BANK0);
1133                 outb(0x62, iobase+MCR);
1134                 break;
1135         default:
1136                 IRDA_DEBUG(0, "%s(), invalid dongle_id %#x",
1137                            __func__, dongle_id);
1138         }
1139
1140         /* IRCFG1: IRSL1 and 2 are set to IrDA mode */
1141         outb(0x00, iobase+4);
1142
1143         /* Restore bank register */
1144         outb(bank, iobase+BSR);
1145
1146 } /* set_up_dongle_interface */
1147
1148 /*
1149  * Function nsc_ircc_change_dongle_speed (iobase, speed, dongle_id)
1150  *
1151  *    Change speed of the attach dongle
1152  *
1153  */
1154 static void nsc_ircc_change_dongle_speed(int iobase, int speed, int dongle_id)
1155 {
1156         __u8 bank;
1157
1158         /* Save current bank */
1159         bank = inb(iobase+BSR);
1160
1161         /* Select Bank 7 */
1162         switch_bank(iobase, BANK7);
1163
1164         /* IRCFG1: set according to dongle_id */
1165         switch (dongle_id) {
1166         case 0x00: /* same as */
1167         case 0x01: /* Differential serial interface */
1168                 IRDA_DEBUG(0, "%s(), %s not defined by irda yet\n",
1169                            __func__, dongle_types[dongle_id]);
1170                 break;
1171         case 0x02: /* same as */
1172         case 0x03: /* Reserved */
1173                 IRDA_DEBUG(0, "%s(), %s not defined by irda yet\n",
1174                            __func__, dongle_types[dongle_id]);
1175                 break;
1176         case 0x04: /* Sharp RY5HD01 */
1177                 break;
1178         case 0x05: /* Reserved */
1179                 IRDA_DEBUG(0, "%s(), %s not defined by irda yet\n",
1180                            __func__, dongle_types[dongle_id]);
1181                 break;
1182         case 0x06: /* Single-ended serial interface */
1183                 IRDA_DEBUG(0, "%s(), %s not defined by irda yet\n",
1184                            __func__, dongle_types[dongle_id]);
1185                 break;
1186         case 0x07: /* Consumer-IR only */
1187                 IRDA_DEBUG(0, "%s(), %s is not for IrDA mode\n",
1188                            __func__, dongle_types[dongle_id]);
1189                 break;
1190         case 0x08: /* HP HSDL-2300, HP HSDL-3600/HSDL-3610 */
1191                 IRDA_DEBUG(0, "%s(), %s\n",
1192                            __func__, dongle_types[dongle_id]);
1193                 outb(0x00, iobase+4);
1194                 if (speed > 115200)
1195                         outb(0x01, iobase+4);
1196                 break;
1197         case 0x09: /* IBM31T1100 or Temic TFDS6000/TFDS6500 */
1198                 outb(0x01, iobase+4);
1199
1200                 if (speed == 4000000) {
1201                         /* There was a cli() there, but we now are already
1202                          * under spin_lock_irqsave() - JeanII */
1203                         outb(0x81, iobase+4);
1204                         outb(0x80, iobase+4);
1205                 } else
1206                         outb(0x00, iobase+4);
1207                 break;
1208         case 0x0A: /* same as */
1209         case 0x0B: /* Reserved */
1210                 IRDA_DEBUG(0, "%s(), %s not defined by irda yet\n",
1211                            __func__, dongle_types[dongle_id]);
1212                 break;
1213         case 0x0C: /* same as */
1214         case 0x0D: /* HP HSDL-1100/HSDL-2100 */
1215                 break;
1216         case 0x0E: /* Supports SIR Mode only */
1217                 break;
1218         case 0x0F: /* No dongle connected */
1219                 IRDA_DEBUG(0, "%s(), %s is not for IrDA mode\n",
1220                            __func__, dongle_types[dongle_id]);
1221
1222                 switch_bank(iobase, BANK0);
1223                 outb(0x62, iobase+MCR);
1224                 break;
1225         default:
1226                 IRDA_DEBUG(0, "%s(), invalid data_rate\n", __func__);
1227         }
1228         /* Restore bank register */
1229         outb(bank, iobase+BSR);
1230 }
1231
1232 /*
1233  * Function nsc_ircc_change_speed (self, baud)
1234  *
1235  *    Change the speed of the device
1236  *
1237  * This function *must* be called with irq off and spin-lock.
1238  */
1239 static __u8 nsc_ircc_change_speed(struct nsc_ircc_cb *self, __u32 speed)
1240 {
1241         struct net_device *dev = self->netdev;
1242         __u8 mcr = MCR_SIR;
1243         int iobase;
1244         __u8 bank;
1245         __u8 ier;                  /* Interrupt enable register */
1246
1247         IRDA_DEBUG(2, "%s(), speed=%d\n", __func__, speed);
1248
1249         IRDA_ASSERT(self != NULL, return 0;);
1250
1251         iobase = self->io.fir_base;
1252
1253         /* Update accounting for new speed */
1254         self->io.speed = speed;
1255
1256         /* Save current bank */
1257         bank = inb(iobase+BSR);
1258
1259         /* Disable interrupts */
1260         switch_bank(iobase, BANK0);
1261         outb(0, iobase+IER);
1262
1263         /* Select Bank 2 */
1264         switch_bank(iobase, BANK2);
1265
1266         outb(0x00, iobase+BGDH);
1267         switch (speed) {
1268         case 9600:   outb(0x0c, iobase+BGDL); break;
1269         case 19200:  outb(0x06, iobase+BGDL); break;
1270         case 38400:  outb(0x03, iobase+BGDL); break;
1271         case 57600:  outb(0x02, iobase+BGDL); break;
1272         case 115200: outb(0x01, iobase+BGDL); break;
1273         case 576000:
1274                 switch_bank(iobase, BANK5);
1275
1276                 /* IRCR2: MDRS is set */
1277                 outb(inb(iobase+4) | 0x04, iobase+4);
1278
1279                 mcr = MCR_MIR;
1280                 IRDA_DEBUG(0, "%s(), handling baud of 576000\n", __func__);
1281                 break;
1282         case 1152000:
1283                 mcr = MCR_MIR;
1284                 IRDA_DEBUG(0, "%s(), handling baud of 1152000\n", __func__);
1285                 break;
1286         case 4000000:
1287                 mcr = MCR_FIR;
1288                 IRDA_DEBUG(0, "%s(), handling baud of 4000000\n", __func__);
1289                 break;
1290         default:
1291                 mcr = MCR_FIR;
1292                 IRDA_DEBUG(0, "%s(), unknown baud rate of %d\n",
1293                            __func__, speed);
1294                 break;
1295         }
1296
1297         /* Set appropriate speed mode */
1298         switch_bank(iobase, BANK0);
1299         outb(mcr | MCR_TX_DFR, iobase+MCR);
1300
1301         /* Give some hits to the transceiver */
1302         nsc_ircc_change_dongle_speed(iobase, speed, self->io.dongle_id);
1303
1304         /* Set FIFO threshold to TX17, RX16 */
1305         switch_bank(iobase, BANK0);
1306         outb(0x00, iobase+FCR);
1307         outb(FCR_FIFO_EN, iobase+FCR);
1308         outb(FCR_RXTH|     /* Set Rx FIFO threshold */
1309              FCR_TXTH|     /* Set Tx FIFO threshold */
1310              FCR_TXSR|     /* Reset Tx FIFO */
1311              FCR_RXSR|     /* Reset Rx FIFO */
1312              FCR_FIFO_EN,  /* Enable FIFOs */
1313              iobase+FCR);
1314
1315         /* Set FIFO size to 32 */
1316         switch_bank(iobase, BANK2);
1317         outb(EXCR2_RFSIZ|EXCR2_TFSIZ, iobase+EXCR2);
1318
1319         /* Enable some interrupts so we can receive frames */
1320         switch_bank(iobase, BANK0);
1321         if (speed > 115200) {
1322                 /* Install FIR xmit handler */
1323                 dev->hard_start_xmit = nsc_ircc_hard_xmit_fir;
1324                 ier = IER_SFIF_IE;
1325                 nsc_ircc_dma_receive(self);
1326         } else {
1327                 /* Install SIR xmit handler */
1328                 dev->hard_start_xmit = nsc_ircc_hard_xmit_sir;
1329                 ier = IER_RXHDL_IE;
1330         }
1331         /* Set our current interrupt mask */
1332         outb(ier, iobase+IER);
1333
1334         /* Restore BSR */
1335         outb(bank, iobase+BSR);
1336
1337         /* Make sure interrupt handlers keep the proper interrupt mask */
1338         return(ier);
1339 }
1340
1341 /*
1342  * Function nsc_ircc_hard_xmit (skb, dev)
1343  *
1344  *    Transmit the frame!
1345  *
1346  */
1347 static int nsc_ircc_hard_xmit_sir(struct sk_buff *skb, struct net_device *dev)
1348 {
1349         struct nsc_ircc_cb *self;
1350         unsigned long flags;
1351         int iobase;
1352         __s32 speed;
1353         __u8 bank;
1354
1355         self = netdev_priv(dev);
1356
1357         IRDA_ASSERT(self != NULL, return 0;);
1358
1359         iobase = self->io.fir_base;
1360
1361         netif_stop_queue(dev);
1362
1363         /* Make sure tests *& speed change are atomic */
1364         spin_lock_irqsave(&self->lock, flags);
1365
1366         /* Check if we need to change the speed */
1367         speed = irda_get_next_speed(skb);
1368         if ((speed != self->io.speed) && (speed != -1)) {
1369                 /* Check for empty frame. */
1370                 if (!skb->len) {
1371                         /* If we just sent a frame, we get called before
1372                          * the last bytes get out (because of the SIR FIFO).
1373                          * If this is the case, let interrupt handler change
1374                          * the speed itself... Jean II */
1375                         if (self->io.direction == IO_RECV) {
1376                                 nsc_ircc_change_speed(self, speed);
1377                                 /* TODO : For SIR->SIR, the next packet
1378                                  * may get corrupted - Jean II */
1379                                 netif_wake_queue(dev);
1380                         } else {
1381                                 self->new_speed = speed;
1382                                 /* Queue will be restarted after speed change
1383                                  * to make sure packets gets through the
1384                                  * proper xmit handler - Jean II */
1385                         }
1386                         dev->trans_start = jiffies;
1387                         spin_unlock_irqrestore(&self->lock, flags);
1388                         dev_kfree_skb(skb);
1389                         return 0;
1390                 } else
1391                         self->new_speed = speed;
1392         }
1393
1394         /* Save current bank */
1395         bank = inb(iobase+BSR);
1396
1397         self->tx_buff.data = self->tx_buff.head;
1398
1399         self->tx_buff.len = async_wrap_skb(skb, self->tx_buff.data,
1400                                            self->tx_buff.truesize);
1401
1402         dev->stats.tx_bytes += self->tx_buff.len;
1403
1404         /* Add interrupt on tx low level (will fire immediately) */
1405         switch_bank(iobase, BANK0);
1406         outb(IER_TXLDL_IE, iobase+IER);
1407
1408         /* Restore bank register */
1409         outb(bank, iobase+BSR);
1410
1411         dev->trans_start = jiffies;
1412         spin_unlock_irqrestore(&self->lock, flags);
1413
1414         dev_kfree_skb(skb);
1415
1416         return 0;
1417 }
1418
1419 static int nsc_ircc_hard_xmit_fir(struct sk_buff *skb, struct net_device *dev)
1420 {
1421         struct nsc_ircc_cb *self;
1422         unsigned long flags;
1423         int iobase;
1424         __s32 speed;
1425         __u8 bank;
1426         int mtt, diff;
1427
1428         self = netdev_priv(dev);
1429         iobase = self->io.fir_base;
1430
1431         netif_stop_queue(dev);
1432
1433         /* Make sure tests *& speed change are atomic */
1434         spin_lock_irqsave(&self->lock, flags);
1435
1436         /* Check if we need to change the speed */
1437         speed = irda_get_next_speed(skb);
1438         if ((speed != self->io.speed) && (speed != -1)) {
1439                 /* Check for empty frame. */
1440                 if (!skb->len) {
1441                         /* If we are currently transmitting, defer to
1442                          * interrupt handler. - Jean II */
1443                         if(self->tx_fifo.len == 0) {
1444                                 nsc_ircc_change_speed(self, speed);
1445                                 netif_wake_queue(dev);
1446                         } else {
1447                                 self->new_speed = speed;
1448                                 /* Keep queue stopped :
1449                                  * the speed change operation may change the
1450                                  * xmit handler, and we want to make sure
1451                                  * the next packet get through the proper
1452                                  * Tx path, so block the Tx queue until
1453                                  * the speed change has been done.
1454                                  * Jean II */
1455                         }
1456                         dev->trans_start = jiffies;
1457                         spin_unlock_irqrestore(&self->lock, flags);
1458                         dev_kfree_skb(skb);
1459                         return 0;
1460                 } else {
1461                         /* Change speed after current frame */
1462                         self->new_speed = speed;
1463                 }
1464         }
1465
1466         /* Save current bank */
1467         bank = inb(iobase+BSR);
1468
1469         /* Register and copy this frame to DMA memory */
1470         self->tx_fifo.queue[self->tx_fifo.free].start = self->tx_fifo.tail;
1471         self->tx_fifo.queue[self->tx_fifo.free].len = skb->len;
1472         self->tx_fifo.tail += skb->len;
1473
1474         dev->stats.tx_bytes += skb->len;
1475
1476         skb_copy_from_linear_data(skb, self->tx_fifo.queue[self->tx_fifo.free].start,
1477                       skb->len);
1478         self->tx_fifo.len++;
1479         self->tx_fifo.free++;
1480
1481         /* Start transmit only if there is currently no transmit going on */
1482         if (self->tx_fifo.len == 1) {
1483                 /* Check if we must wait the min turn time or not */
1484                 mtt = irda_get_mtt(skb);
1485                 if (mtt) {
1486                         /* Check how much time we have used already */
1487                         do_gettimeofday(&self->now);
1488                         diff = self->now.tv_usec - self->stamp.tv_usec;
1489                         if (diff < 0)
1490                                 diff += 1000000;
1491
1492                         /* Check if the mtt is larger than the time we have
1493                          * already used by all the protocol processing
1494                          */
1495                         if (mtt > diff) {
1496                                 mtt -= diff;
1497
1498                                 /*
1499                                  * Use timer if delay larger than 125 us, and
1500                                  * use udelay for smaller values which should
1501                                  * be acceptable
1502                                  */
1503                                 if (mtt > 125) {
1504                                         /* Adjust for timer resolution */
1505                                         mtt = mtt / 125;
1506
1507                                         /* Setup timer */
1508                                         switch_bank(iobase, BANK4);
1509                                         outb(mtt & 0xff, iobase+TMRL);
1510                                         outb((mtt >> 8) & 0x0f, iobase+TMRH);
1511
1512                                         /* Start timer */
1513                                         outb(IRCR1_TMR_EN, iobase+IRCR1);
1514                                         self->io.direction = IO_XMIT;
1515
1516                                         /* Enable timer interrupt */
1517                                         switch_bank(iobase, BANK0);
1518                                         outb(IER_TMR_IE, iobase+IER);
1519
1520                                         /* Timer will take care of the rest */
1521                                         goto out;
1522                                 } else
1523                                         udelay(mtt);
1524                         }
1525                 }
1526                 /* Enable DMA interrupt */
1527                 switch_bank(iobase, BANK0);
1528                 outb(IER_DMA_IE, iobase+IER);
1529
1530                 /* Transmit frame */
1531                 nsc_ircc_dma_xmit(self, iobase);
1532         }
1533  out:
1534         /* Not busy transmitting anymore if window is not full,
1535          * and if we don't need to change speed */
1536         if ((self->tx_fifo.free < MAX_TX_WINDOW) && (self->new_speed == 0))
1537                 netif_wake_queue(self->netdev);
1538
1539         /* Restore bank register */
1540         outb(bank, iobase+BSR);
1541
1542         dev->trans_start = jiffies;
1543         spin_unlock_irqrestore(&self->lock, flags);
1544         dev_kfree_skb(skb);
1545
1546         return 0;
1547 }
1548
1549 /*
1550  * Function nsc_ircc_dma_xmit (self, iobase)
1551  *
1552  *    Transmit data using DMA
1553  *
1554  */
1555 static void nsc_ircc_dma_xmit(struct nsc_ircc_cb *self, int iobase)
1556 {
1557         int bsr;
1558
1559         /* Save current bank */
1560         bsr = inb(iobase+BSR);
1561
1562         /* Disable DMA */
1563         switch_bank(iobase, BANK0);
1564         outb(inb(iobase+MCR) & ~MCR_DMA_EN, iobase+MCR);
1565
1566         self->io.direction = IO_XMIT;
1567
1568         /* Choose transmit DMA channel  */
1569         switch_bank(iobase, BANK2);
1570         outb(ECR1_DMASWP|ECR1_DMANF|ECR1_EXT_SL, iobase+ECR1);
1571
1572         irda_setup_dma(self->io.dma,
1573                        ((u8 *)self->tx_fifo.queue[self->tx_fifo.ptr].start -
1574                         self->tx_buff.head) + self->tx_buff_dma,
1575                        self->tx_fifo.queue[self->tx_fifo.ptr].len,
1576                        DMA_TX_MODE);
1577
1578         /* Enable DMA and SIR interaction pulse */
1579         switch_bank(iobase, BANK0);
1580         outb(inb(iobase+MCR)|MCR_TX_DFR|MCR_DMA_EN|MCR_IR_PLS, iobase+MCR);
1581
1582         /* Restore bank register */
1583         outb(bsr, iobase+BSR);
1584 }
1585
1586 /*
1587  * Function nsc_ircc_pio_xmit (self, iobase)
1588  *
1589  *    Transmit data using PIO. Returns the number of bytes that actually
1590  *    got transferred
1591  *
1592  */
1593 static int nsc_ircc_pio_write(int iobase, __u8 *buf, int len, int fifo_size)
1594 {
1595         int actual = 0;
1596         __u8 bank;
1597
1598         IRDA_DEBUG(4, "%s()\n", __func__);
1599
1600         /* Save current bank */
1601         bank = inb(iobase+BSR);
1602
1603         switch_bank(iobase, BANK0);
1604         if (!(inb_p(iobase+LSR) & LSR_TXEMP)) {
1605                 IRDA_DEBUG(4, "%s(), warning, FIFO not empty yet!\n",
1606                            __func__);
1607
1608                 /* FIFO may still be filled to the Tx interrupt threshold */
1609                 fifo_size -= 17;
1610         }
1611
1612         /* Fill FIFO with current frame */
1613         while ((fifo_size-- > 0) && (actual < len)) {
1614                 /* Transmit next byte */
1615                 outb(buf[actual++], iobase+TXD);
1616         }
1617
1618         IRDA_DEBUG(4, "%s(), fifo_size %d ; %d sent of %d\n",
1619                    __func__, fifo_size, actual, len);
1620
1621         /* Restore bank */
1622         outb(bank, iobase+BSR);
1623
1624         return actual;
1625 }
1626
1627 /*
1628  * Function nsc_ircc_dma_xmit_complete (self)
1629  *
1630  *    The transfer of a frame in finished. This function will only be called
1631  *    by the interrupt handler
1632  *
1633  */
1634 static int nsc_ircc_dma_xmit_complete(struct nsc_ircc_cb *self)
1635 {
1636         int iobase;
1637         __u8 bank;
1638         int ret = TRUE;
1639
1640         IRDA_DEBUG(2, "%s()\n", __func__);
1641
1642         iobase = self->io.fir_base;
1643
1644         /* Save current bank */
1645         bank = inb(iobase+BSR);
1646
1647         /* Disable DMA */
1648         switch_bank(iobase, BANK0);
1649         outb(inb(iobase+MCR) & ~MCR_DMA_EN, iobase+MCR);
1650
1651         /* Check for underrrun! */
1652         if (inb(iobase+ASCR) & ASCR_TXUR) {
1653                 self->netdev->stats.tx_errors++;
1654                 self->netdev->stats.tx_fifo_errors++;
1655
1656                 /* Clear bit, by writing 1 into it */
1657                 outb(ASCR_TXUR, iobase+ASCR);
1658         } else {
1659                 self->netdev->stats.tx_packets++;
1660         }
1661
1662         /* Finished with this frame, so prepare for next */
1663         self->tx_fifo.ptr++;
1664         self->tx_fifo.len--;
1665
1666         /* Any frames to be sent back-to-back? */
1667         if (self->tx_fifo.len) {
1668                 nsc_ircc_dma_xmit(self, iobase);
1669
1670                 /* Not finished yet! */
1671                 ret = FALSE;
1672         } else {
1673                 /* Reset Tx FIFO info */
1674                 self->tx_fifo.len = self->tx_fifo.ptr = self->tx_fifo.free = 0;
1675                 self->tx_fifo.tail = self->tx_buff.head;
1676         }
1677
1678         /* Make sure we have room for more frames and
1679          * that we don't need to change speed */
1680         if ((self->tx_fifo.free < MAX_TX_WINDOW) && (self->new_speed == 0)) {
1681                 /* Not busy transmitting anymore */
1682                 /* Tell the network layer, that we can accept more frames */
1683                 netif_wake_queue(self->netdev);
1684         }
1685
1686         /* Restore bank */
1687         outb(bank, iobase+BSR);
1688
1689         return ret;
1690 }
1691
1692 /*
1693  * Function nsc_ircc_dma_receive (self)
1694  *
1695  *    Get ready for receiving a frame. The device will initiate a DMA
1696  *    if it starts to receive a frame.
1697  *
1698  */
1699 static int nsc_ircc_dma_receive(struct nsc_ircc_cb *self)
1700 {
1701         int iobase;
1702         __u8 bsr;
1703
1704         iobase = self->io.fir_base;
1705
1706         /* Reset Tx FIFO info */
1707         self->tx_fifo.len = self->tx_fifo.ptr = self->tx_fifo.free = 0;
1708         self->tx_fifo.tail = self->tx_buff.head;
1709
1710         /* Save current bank */
1711         bsr = inb(iobase+BSR);
1712
1713         /* Disable DMA */
1714         switch_bank(iobase, BANK0);
1715         outb(inb(iobase+MCR) & ~MCR_DMA_EN, iobase+MCR);
1716
1717         /* Choose DMA Rx, DMA Fairness, and Advanced mode */
1718         switch_bank(iobase, BANK2);
1719         outb(ECR1_DMANF|ECR1_EXT_SL, iobase+ECR1);
1720
1721         self->io.direction = IO_RECV;
1722         self->rx_buff.data = self->rx_buff.head;
1723
1724         /* Reset Rx FIFO. This will also flush the ST_FIFO */
1725         switch_bank(iobase, BANK0);
1726         outb(FCR_RXSR|FCR_FIFO_EN, iobase+FCR);
1727
1728         self->st_fifo.len = self->st_fifo.pending_bytes = 0;
1729         self->st_fifo.tail = self->st_fifo.head = 0;
1730
1731         irda_setup_dma(self->io.dma, self->rx_buff_dma, self->rx_buff.truesize,
1732                        DMA_RX_MODE);
1733
1734         /* Enable DMA */
1735         switch_bank(iobase, BANK0);
1736         outb(inb(iobase+MCR)|MCR_DMA_EN, iobase+MCR);
1737
1738         /* Restore bank register */
1739         outb(bsr, iobase+BSR);
1740
1741         return 0;
1742 }
1743
1744 /*
1745  * Function nsc_ircc_dma_receive_complete (self)
1746  *
1747  *    Finished with receiving frames
1748  *
1749  *
1750  */
1751 static int nsc_ircc_dma_receive_complete(struct nsc_ircc_cb *self, int iobase)
1752 {
1753         struct st_fifo *st_fifo;
1754         struct sk_buff *skb;
1755         __u8 status;
1756         __u8 bank;
1757         int len;
1758
1759         st_fifo = &self->st_fifo;
1760
1761         /* Save current bank */
1762         bank = inb(iobase+BSR);
1763
1764         /* Read all entries in status FIFO */
1765         switch_bank(iobase, BANK5);
1766         while ((status = inb(iobase+FRM_ST)) & FRM_ST_VLD) {
1767                 /* We must empty the status FIFO no matter what */
1768                 len = inb(iobase+RFLFL) | ((inb(iobase+RFLFH) & 0x1f) << 8);
1769
1770                 if (st_fifo->tail >= MAX_RX_WINDOW) {
1771                         IRDA_DEBUG(0, "%s(), window is full!\n", __func__);
1772                         continue;
1773                 }
1774
1775                 st_fifo->entries[st_fifo->tail].status = status;
1776                 st_fifo->entries[st_fifo->tail].len = len;
1777                 st_fifo->pending_bytes += len;
1778                 st_fifo->tail++;
1779                 st_fifo->len++;
1780         }
1781         /* Try to process all entries in status FIFO */
1782         while (st_fifo->len > 0) {
1783                 /* Get first entry */
1784                 status = st_fifo->entries[st_fifo->head].status;
1785                 len    = st_fifo->entries[st_fifo->head].len;
1786                 st_fifo->pending_bytes -= len;
1787                 st_fifo->head++;
1788                 st_fifo->len--;
1789
1790                 /* Check for errors */
1791                 if (status & FRM_ST_ERR_MSK) {
1792                         if (status & FRM_ST_LOST_FR) {
1793                                 /* Add number of lost frames to stats */
1794                                 self->netdev->stats.rx_errors += len;
1795                         } else {
1796                                 /* Skip frame */
1797                                 self->netdev->stats.rx_errors++;
1798
1799                                 self->rx_buff.data += len;
1800
1801                                 if (status & FRM_ST_MAX_LEN)
1802                                         self->netdev->stats.rx_length_errors++;
1803
1804                                 if (status & FRM_ST_PHY_ERR)
1805                                         self->netdev->stats.rx_frame_errors++;
1806
1807                                 if (status & FRM_ST_BAD_CRC)
1808                                         self->netdev->stats.rx_crc_errors++;
1809                         }
1810                         /* The errors below can be reported in both cases */
1811                         if (status & FRM_ST_OVR1)
1812                                 self->netdev->stats.rx_fifo_errors++;
1813
1814                         if (status & FRM_ST_OVR2)
1815                                 self->netdev->stats.rx_fifo_errors++;
1816                 } else {
1817                         /*
1818                          * First we must make sure that the frame we
1819                          * want to deliver is all in main memory. If we
1820                          * cannot tell, then we check if the Rx FIFO is
1821                          * empty. If not then we will have to take a nap
1822                          * and try again later.
1823                          */
1824                         if (st_fifo->pending_bytes < self->io.fifo_size) {
1825                                 switch_bank(iobase, BANK0);
1826                                 if (inb(iobase+LSR) & LSR_RXDA) {
1827                                         /* Put this entry back in fifo */
1828                                         st_fifo->head--;
1829                                         st_fifo->len++;
1830                                         st_fifo->pending_bytes += len;
1831                                         st_fifo->entries[st_fifo->head].status = status;
1832                                         st_fifo->entries[st_fifo->head].len = len;
1833                                         /*
1834                                          * DMA not finished yet, so try again
1835                                          * later, set timer value, resolution
1836                                          * 125 us
1837                                          */
1838                                         switch_bank(iobase, BANK4);
1839                                         outb(0x02, iobase+TMRL); /* x 125 us */
1840                                         outb(0x00, iobase+TMRH);
1841
1842                                         /* Start timer */
1843                                         outb(IRCR1_TMR_EN, iobase+IRCR1);
1844
1845                                         /* Restore bank register */
1846                                         outb(bank, iobase+BSR);
1847
1848                                         return FALSE; /* I'll be back! */
1849                                 }
1850                         }
1851
1852                         /*
1853                          * Remember the time we received this frame, so we can
1854                          * reduce the min turn time a bit since we will know
1855                          * how much time we have used for protocol processing
1856                          */
1857                         do_gettimeofday(&self->stamp);
1858
1859                         skb = dev_alloc_skb(len+1);
1860                         if (skb == NULL)  {
1861                                 IRDA_WARNING("%s(), memory squeeze, "
1862                                              "dropping frame.\n",
1863                                              __func__);
1864                                 self->netdev->stats.rx_dropped++;
1865
1866                                 /* Restore bank register */
1867                                 outb(bank, iobase+BSR);
1868
1869                                 return FALSE;
1870                         }
1871
1872                         /* Make sure IP header gets aligned */
1873                         skb_reserve(skb, 1);
1874
1875                         /* Copy frame without CRC */
1876                         if (self->io.speed < 4000000) {
1877                                 skb_put(skb, len-2);
1878                                 skb_copy_to_linear_data(skb,
1879                                                         self->rx_buff.data,
1880                                                         len - 2);
1881                         } else {
1882                                 skb_put(skb, len-4);
1883                                 skb_copy_to_linear_data(skb,
1884                                                         self->rx_buff.data,
1885                                                         len - 4);
1886                         }
1887
1888                         /* Move to next frame */
1889                         self->rx_buff.data += len;
1890                         self->netdev->stats.rx_bytes += len;
1891                         self->netdev->stats.rx_packets++;
1892
1893                         skb->dev = self->netdev;
1894                         skb_reset_mac_header(skb);
1895                         skb->protocol = htons(ETH_P_IRDA);
1896                         netif_rx(skb);
1897                 }
1898         }
1899         /* Restore bank register */
1900         outb(bank, iobase+BSR);
1901
1902         return TRUE;
1903 }
1904
1905 /*
1906  * Function nsc_ircc_pio_receive (self)
1907  *
1908  *    Receive all data in receiver FIFO
1909  *
1910  */
1911 static void nsc_ircc_pio_receive(struct nsc_ircc_cb *self)
1912 {
1913         __u8 byte;
1914         int iobase;
1915
1916         iobase = self->io.fir_base;
1917
1918         /*  Receive all characters in Rx FIFO */
1919         do {
1920                 byte = inb(iobase+RXD);
1921                 async_unwrap_char(self->netdev, &self->netdev->stats,
1922                                   &self->rx_buff, byte);
1923         } while (inb(iobase+LSR) & LSR_RXDA); /* Data available */
1924 }
1925
1926 /*
1927  * Function nsc_ircc_sir_interrupt (self, eir)
1928  *
1929  *    Handle SIR interrupt
1930  *
1931  */
1932 static void nsc_ircc_sir_interrupt(struct nsc_ircc_cb *self, int eir)
1933 {
1934         int actual;
1935
1936         /* Check if transmit FIFO is low on data */
1937         if (eir & EIR_TXLDL_EV) {
1938                 /* Write data left in transmit buffer */
1939                 actual = nsc_ircc_pio_write(self->io.fir_base,
1940                                            self->tx_buff.data,
1941                                            self->tx_buff.len,
1942                                            self->io.fifo_size);
1943                 self->tx_buff.data += actual;
1944                 self->tx_buff.len  -= actual;
1945
1946                 self->io.direction = IO_XMIT;
1947
1948                 /* Check if finished */
1949                 if (self->tx_buff.len > 0)
1950                         self->ier = IER_TXLDL_IE;
1951                 else {
1952
1953                         self->netdev->stats.tx_packets++;
1954                         netif_wake_queue(self->netdev);
1955                         self->ier = IER_TXEMP_IE;
1956                 }
1957
1958         }
1959         /* Check if transmission has completed */
1960         if (eir & EIR_TXEMP_EV) {
1961                 /* Turn around and get ready to receive some data */
1962                 self->io.direction = IO_RECV;
1963                 self->ier = IER_RXHDL_IE;
1964                 /* Check if we need to change the speed?
1965                  * Need to be after self->io.direction to avoid race with
1966                  * nsc_ircc_hard_xmit_sir() - Jean II */
1967                 if (self->new_speed) {
1968                         IRDA_DEBUG(2, "%s(), Changing speed!\n", __func__);
1969                         self->ier = nsc_ircc_change_speed(self,
1970                                                           self->new_speed);
1971                         self->new_speed = 0;
1972                         netif_wake_queue(self->netdev);
1973
1974                         /* Check if we are going to FIR */
1975                         if (self->io.speed > 115200) {
1976                                 /* No need to do anymore SIR stuff */
1977                                 return;
1978                         }
1979                 }
1980         }
1981
1982         /* Rx FIFO threshold or timeout */
1983         if (eir & EIR_RXHDL_EV) {
1984                 nsc_ircc_pio_receive(self);
1985
1986                 /* Keep receiving */
1987                 self->ier = IER_RXHDL_IE;
1988         }
1989 }
1990
1991 /*
1992  * Function nsc_ircc_fir_interrupt (self, eir)
1993  *
1994  *    Handle MIR/FIR interrupt
1995  *
1996  */
1997 static void nsc_ircc_fir_interrupt(struct nsc_ircc_cb *self, int iobase,
1998                                    int eir)
1999 {
2000         __u8 bank;
2001
2002         bank = inb(iobase+BSR);
2003
2004         /* Status FIFO event*/
2005         if (eir & EIR_SFIF_EV) {
2006                 /* Check if DMA has finished */
2007                 if (nsc_ircc_dma_receive_complete(self, iobase)) {
2008                         /* Wait for next status FIFO interrupt */
2009                         self->ier = IER_SFIF_IE;
2010                 } else {
2011                         self->ier = IER_SFIF_IE | IER_TMR_IE;
2012                 }
2013         } else if (eir & EIR_TMR_EV) { /* Timer finished */
2014                 /* Disable timer */
2015                 switch_bank(iobase, BANK4);
2016                 outb(0, iobase+IRCR1);
2017
2018                 /* Clear timer event */
2019                 switch_bank(iobase, BANK0);
2020                 outb(ASCR_CTE, iobase+ASCR);
2021
2022                 /* Check if this is a Tx timer interrupt */
2023                 if (self->io.direction == IO_XMIT) {
2024                         nsc_ircc_dma_xmit(self, iobase);
2025
2026                         /* Interrupt on DMA */
2027                         self->ier = IER_DMA_IE;
2028                 } else {
2029                         /* Check (again) if DMA has finished */
2030                         if (nsc_ircc_dma_receive_complete(self, iobase)) {
2031                                 self->ier = IER_SFIF_IE;
2032                         } else {
2033                                 self->ier = IER_SFIF_IE | IER_TMR_IE;
2034                         }
2035                 }
2036         } else if (eir & EIR_DMA_EV) {
2037                 /* Finished with all transmissions? */
2038                 if (nsc_ircc_dma_xmit_complete(self)) {
2039                         if(self->new_speed != 0) {
2040                                 /* As we stop the Tx queue, the speed change
2041                                  * need to be done when the Tx fifo is
2042                                  * empty. Ask for a Tx done interrupt */
2043                                 self->ier = IER_TXEMP_IE;
2044                         } else {
2045                                 /* Check if there are more frames to be
2046                                  * transmitted */
2047                                 if (irda_device_txqueue_empty(self->netdev)) {
2048                                         /* Prepare for receive */
2049                                         nsc_ircc_dma_receive(self);
2050                                         self->ier = IER_SFIF_IE;
2051                                 } else
2052                                         IRDA_WARNING("%s(), potential "
2053                                                      "Tx queue lockup !\n",
2054                                                      __func__);
2055                         }
2056                 } else {
2057                         /*  Not finished yet, so interrupt on DMA again */
2058                         self->ier = IER_DMA_IE;
2059                 }
2060         } else if (eir & EIR_TXEMP_EV) {
2061                 /* The Tx FIFO has totally drained out, so now we can change
2062                  * the speed... - Jean II */
2063                 self->ier = nsc_ircc_change_speed(self, self->new_speed);
2064                 self->new_speed = 0;
2065                 netif_wake_queue(self->netdev);
2066                 /* Note : nsc_ircc_change_speed() restarted Rx fifo */
2067         }
2068
2069         outb(bank, iobase+BSR);
2070 }
2071
2072 /*
2073  * Function nsc_ircc_interrupt (irq, dev_id, regs)
2074  *
2075  *    An interrupt from the chip has arrived. Time to do some work
2076  *
2077  */
2078 static irqreturn_t nsc_ircc_interrupt(int irq, void *dev_id)
2079 {
2080         struct net_device *dev = dev_id;
2081         struct nsc_ircc_cb *self;
2082         __u8 bsr, eir;
2083         int iobase;
2084
2085         self = netdev_priv(dev);
2086
2087         spin_lock(&self->lock);
2088
2089         iobase = self->io.fir_base;
2090
2091         bsr = inb(iobase+BSR);  /* Save current bank */
2092
2093         switch_bank(iobase, BANK0);
2094         self->ier = inb(iobase+IER);
2095         eir = inb(iobase+EIR) & self->ier; /* Mask out the interesting ones */
2096
2097         outb(0, iobase+IER); /* Disable interrupts */
2098
2099         if (eir) {
2100                 /* Dispatch interrupt handler for the current speed */
2101                 if (self->io.speed > 115200)
2102                         nsc_ircc_fir_interrupt(self, iobase, eir);
2103                 else
2104                         nsc_ircc_sir_interrupt(self, eir);
2105         }
2106
2107         outb(self->ier, iobase+IER); /* Restore interrupts */
2108         outb(bsr, iobase+BSR);       /* Restore bank register */
2109
2110         spin_unlock(&self->lock);
2111         return IRQ_RETVAL(eir);
2112 }
2113
2114 /*
2115  * Function nsc_ircc_is_receiving (self)
2116  *
2117  *    Return TRUE is we are currently receiving a frame
2118  *
2119  */
2120 static int nsc_ircc_is_receiving(struct nsc_ircc_cb *self)
2121 {
2122         unsigned long flags;
2123         int status = FALSE;
2124         int iobase;
2125         __u8 bank;
2126
2127         IRDA_ASSERT(self != NULL, return FALSE;);
2128
2129         spin_lock_irqsave(&self->lock, flags);
2130
2131         if (self->io.speed > 115200) {
2132                 iobase = self->io.fir_base;
2133
2134                 /* Check if rx FIFO is not empty */
2135                 bank = inb(iobase+BSR);
2136                 switch_bank(iobase, BANK2);
2137                 if ((inb(iobase+RXFLV) & 0x3f) != 0) {
2138                         /* We are receiving something */
2139                         status =  TRUE;
2140                 }
2141                 outb(bank, iobase+BSR);
2142         } else
2143                 status = (self->rx_buff.state != OUTSIDE_FRAME);
2144
2145         spin_unlock_irqrestore(&self->lock, flags);
2146
2147         return status;
2148 }
2149
2150 /*
2151  * Function nsc_ircc_net_open (dev)
2152  *
2153  *    Start the device
2154  *
2155  */
2156 static int nsc_ircc_net_open(struct net_device *dev)
2157 {
2158         struct nsc_ircc_cb *self;
2159         int iobase;
2160         char hwname[32];
2161         __u8 bank;
2162
2163         IRDA_DEBUG(4, "%s()\n", __func__);
2164
2165         IRDA_ASSERT(dev != NULL, return -1;);
2166         self = netdev_priv(dev);
2167
2168         IRDA_ASSERT(self != NULL, return 0;);
2169
2170         iobase = self->io.fir_base;
2171
2172         if (request_irq(self->io.irq, nsc_ircc_interrupt, 0, dev->name, dev)) {
2173                 IRDA_WARNING("%s, unable to allocate irq=%d\n",
2174                              driver_name, self->io.irq);
2175                 return -EAGAIN;
2176         }
2177         /*
2178          * Always allocate the DMA channel after the IRQ, and clean up on
2179          * failure.
2180          */
2181         if (request_dma(self->io.dma, dev->name)) {
2182                 IRDA_WARNING("%s, unable to allocate dma=%d\n",
2183                              driver_name, self->io.dma);
2184                 free_irq(self->io.irq, dev);
2185                 return -EAGAIN;
2186         }
2187
2188         /* Save current bank */
2189         bank = inb(iobase+BSR);
2190
2191         /* turn on interrupts */
2192         switch_bank(iobase, BANK0);
2193         outb(IER_LS_IE | IER_RXHDL_IE, iobase+IER);
2194
2195         /* Restore bank register */
2196         outb(bank, iobase+BSR);
2197
2198         /* Ready to play! */
2199         netif_start_queue(dev);
2200
2201         /* Give self a hardware name */
2202         sprintf(hwname, "NSC-FIR @ 0x%03x", self->io.fir_base);
2203
2204         /*
2205          * Open new IrLAP layer instance, now that everything should be
2206          * initialized properly
2207          */
2208         self->irlap = irlap_open(dev, &self->qos, hwname);
2209
2210         return 0;
2211 }
2212
2213 /*
2214  * Function nsc_ircc_net_close (dev)
2215  *
2216  *    Stop the device
2217  *
2218  */
2219 static int nsc_ircc_net_close(struct net_device *dev)
2220 {
2221         struct nsc_ircc_cb *self;
2222         int iobase;
2223         __u8 bank;
2224
2225         IRDA_DEBUG(4, "%s()\n", __func__);
2226
2227         IRDA_ASSERT(dev != NULL, return -1;);
2228
2229         self = netdev_priv(dev);
2230         IRDA_ASSERT(self != NULL, return 0;);
2231
2232         /* Stop device */
2233         netif_stop_queue(dev);
2234
2235         /* Stop and remove instance of IrLAP */
2236         if (self->irlap)
2237                 irlap_close(self->irlap);
2238         self->irlap = NULL;
2239
2240         iobase = self->io.fir_base;
2241
2242         disable_dma(self->io.dma);
2243
2244         /* Save current bank */
2245         bank = inb(iobase+BSR);
2246
2247         /* Disable interrupts */
2248         switch_bank(iobase, BANK0);
2249         outb(0, iobase+IER);
2250
2251         free_irq(self->io.irq, dev);
2252         free_dma(self->io.dma);
2253
2254         /* Restore bank register */
2255         outb(bank, iobase+BSR);
2256
2257         return 0;
2258 }
2259
2260 /*
2261  * Function nsc_ircc_net_ioctl (dev, rq, cmd)
2262  *
2263  *    Process IOCTL commands for this device
2264  *
2265  */
2266 static int nsc_ircc_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
2267 {
2268         struct if_irda_req *irq = (struct if_irda_req *) rq;
2269         struct nsc_ircc_cb *self;
2270         unsigned long flags;
2271         int ret = 0;
2272
2273         IRDA_ASSERT(dev != NULL, return -1;);
2274
2275         self = netdev_priv(dev);
2276
2277         IRDA_ASSERT(self != NULL, return -1;);
2278
2279         IRDA_DEBUG(2, "%s(), %s, (cmd=0x%X)\n", __func__, dev->name, cmd);
2280
2281         switch (cmd) {
2282         case SIOCSBANDWIDTH: /* Set bandwidth */
2283                 if (!capable(CAP_NET_ADMIN)) {
2284                         ret = -EPERM;
2285                         break;
2286                 }
2287                 spin_lock_irqsave(&self->lock, flags);
2288                 nsc_ircc_change_speed(self, irq->ifr_baudrate);
2289                 spin_unlock_irqrestore(&self->lock, flags);
2290                 break;
2291         case SIOCSMEDIABUSY: /* Set media busy */
2292                 if (!capable(CAP_NET_ADMIN)) {
2293                         ret = -EPERM;
2294                         break;
2295                 }
2296                 irda_device_set_media_busy(self->netdev, TRUE);
2297                 break;
2298         case SIOCGRECEIVING: /* Check if we are receiving right now */
2299                 /* This is already protected */
2300                 irq->ifr_receiving = nsc_ircc_is_receiving(self);
2301                 break;
2302         default:
2303                 ret = -EOPNOTSUPP;
2304         }
2305         return ret;
2306 }
2307
2308 static int nsc_ircc_suspend(struct platform_device *dev, pm_message_t state)
2309 {
2310         struct nsc_ircc_cb *self = platform_get_drvdata(dev);
2311         int bank;
2312         unsigned long flags;
2313         int iobase = self->io.fir_base;
2314
2315         if (self->io.suspended)
2316                 return 0;
2317
2318         IRDA_DEBUG(1, "%s, Suspending\n", driver_name);
2319
2320         rtnl_lock();
2321         if (netif_running(self->netdev)) {
2322                 netif_device_detach(self->netdev);
2323                 spin_lock_irqsave(&self->lock, flags);
2324                 /* Save current bank */
2325                 bank = inb(iobase+BSR);
2326
2327                 /* Disable interrupts */
2328                 switch_bank(iobase, BANK0);
2329                 outb(0, iobase+IER);
2330
2331                 /* Restore bank register */
2332                 outb(bank, iobase+BSR);
2333
2334                 spin_unlock_irqrestore(&self->lock, flags);
2335                 free_irq(self->io.irq, self->netdev);
2336                 disable_dma(self->io.dma);
2337         }
2338         self->io.suspended = 1;
2339         rtnl_unlock();
2340
2341         return 0;
2342 }
2343
2344 static int nsc_ircc_resume(struct platform_device *dev)
2345 {
2346         struct nsc_ircc_cb *self = platform_get_drvdata(dev);
2347         unsigned long flags;
2348
2349         if (!self->io.suspended)
2350                 return 0;
2351
2352         IRDA_DEBUG(1, "%s, Waking up\n", driver_name);
2353
2354         rtnl_lock();
2355         nsc_ircc_setup(&self->io);
2356         nsc_ircc_init_dongle_interface(self->io.fir_base, self->io.dongle_id);
2357
2358         if (netif_running(self->netdev)) {
2359                 if (request_irq(self->io.irq, nsc_ircc_interrupt, 0,
2360                                 self->netdev->name, self->netdev)) {
2361                         IRDA_WARNING("%s, unable to allocate irq=%d\n",
2362                                      driver_name, self->io.irq);
2363
2364                         /*
2365                          * Don't fail resume process, just kill this
2366                          * network interface
2367                          */
2368                         unregister_netdevice(self->netdev);
2369                 } else {
2370                         spin_lock_irqsave(&self->lock, flags);
2371                         nsc_ircc_change_speed(self, self->io.speed);
2372                         spin_unlock_irqrestore(&self->lock, flags);
2373                         netif_device_attach(self->netdev);
2374                 }
2375
2376         } else {
2377                 spin_lock_irqsave(&self->lock, flags);
2378                 nsc_ircc_change_speed(self, 9600);
2379                 spin_unlock_irqrestore(&self->lock, flags);
2380         }
2381         self->io.suspended = 0;
2382         rtnl_unlock();
2383
2384         return 0;
2385 }
2386
2387 MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
2388 MODULE_DESCRIPTION("NSC IrDA Device Driver");
2389 MODULE_LICENSE("GPL");
2390
2391
2392 module_param(qos_mtt_bits, int, 0);
2393 MODULE_PARM_DESC(qos_mtt_bits, "Minimum Turn Time");
2394 module_param_array(io, int, NULL, 0);
2395 MODULE_PARM_DESC(io, "Base I/O addresses");
2396 module_param_array(irq, int, NULL, 0);
2397 MODULE_PARM_DESC(irq, "IRQ lines");
2398 module_param_array(dma, int, NULL, 0);
2399 MODULE_PARM_DESC(dma, "DMA channels");
2400 module_param(dongle_id, int, 0);
2401 MODULE_PARM_DESC(dongle_id, "Type-id of used dongle");
2402
2403 module_init(nsc_ircc_init);
2404 module_exit(nsc_ircc_cleanup);
2405