drivers/net/irda/irport.c

   1 /*********************************************************************
   2  *
   3  * Filename:      irport.c
   4  * Version:       1.0
   5  * Description:   Half duplex serial port SIR driver for IrDA.
   6  * Status:        Experimental.
   7  * Author:        Dag Brattli <dagb@cs.uit.no>
   8  * Created at:    Sun Aug  3 13:49:59 1997
   9  * Modified at:   Fri Jan 28 20:22:38 2000
  10  * Modified by:   Dag Brattli <dagb@cs.uit.no>
  11  * Sources:       serial.c by Linus Torvalds
  12  *
  13  *     Copyright (c) 1997, 1998, 1999-2000 Dag Brattli, All Rights Reserved.
  14  *     Copyright (c) 2000-2003 Jean Tourrilhes, All Rights Reserved.
  15  *
  16  *     This program is free software; you can redistribute it and/or
  17  *     modify it under the terms of the GNU General Public License as
  18  *     published by the Free Software Foundation; either version 2 of
  19  *     the License, or (at your option) any later version.
  20  *
  21  *     This program is distributed in the hope that it will be useful,
  22  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  23  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  24  *     GNU General Public License for more details.
  25  *
  26  *     You should have received a copy of the GNU General Public License
  27  *     along with this program; if not, write to the Free Software
  28  *     Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  29  *     MA 02111-1307 USA
  30  *
  31  *     This driver is ment to be a small half duplex serial driver to be
  32  *     used for IR-chipsets that has a UART (16550) compatibility mode.
  33  *     Eventually it will replace irtty, because of irtty has some
  34  *     problems that is hard to get around when we don't have control
  35  *     over the serial driver. This driver may also be used by FIR
  36  *     drivers to handle SIR mode for them.
  37  *
  38  ********************************************************************/
  39
  40 #include <linux/module.h>
  41
  42 #include <linux/kernel.h>
  43 #include <linux/types.h>
  44 #include <linux/ioport.h>
  45 #include <linux/slab.h>
  46 #include <linux/string.h>
  47 #include <linux/skbuff.h>
  48 #include <linux/serial_reg.h>
  49 #include <linux/errno.h>
  50 #include <linux/init.h>
  51 #include <linux/spinlock.h>
  52 #include <linux/delay.h>
  53 #include <linux/rtnetlink.h>
  54 #include <linux/bitops.h>
  55
  56 #include <asm/system.h>
  57 #include <asm/io.h>
  58
  59 #include <net/irda/irda.h>
  60 #include <net/irda/wrapper.h>
  61 #include "irport.h"
  62
  63 #define IO_EXTENT 8
  64
  65 /*
  66  * Currently you'll need to set these values using insmod like this:
  67  * insmod irport io=0x3e8 irq=11
  68  */
  69 static unsigned int io[]  = { ~0, ~0, ~0, ~0 };
  70 static unsigned int irq[] = { 0, 0, 0, 0 };
  71
  72 static unsigned int qos_mtt_bits = 0x03;
  73
  74 static struct irport_cb *dev_self[] = { NULL, NULL, NULL, NULL};
  75 static char *driver_name = "irport";
  76
  77 static inline void irport_write_wakeup(struct irport_cb *self);
  78 static inline int  irport_write(int iobase, int fifo_size, __u8 *buf, int len);
  79 static inline void irport_receive(struct irport_cb *self);
  80
  81 static int  irport_net_ioctl(struct net_device *dev, struct ifreq *rq,
  82                              int cmd);
  83 static inline int  irport_is_receiving(struct irport_cb *self);
  84 static int  irport_set_dtr_rts(struct net_device *dev, int dtr, int rts);
  85 static int  irport_raw_write(struct net_device *dev, __u8 *buf, int len);
  86 static struct net_device_stats *irport_net_get_stats(struct net_device *dev);
  87 static int irport_change_speed_complete(struct irda_task *task);
  88 static void irport_timeout(struct net_device *dev);
  89
  90 static irqreturn_t irport_interrupt(int irq, void *dev_id);
  91 static int irport_hard_xmit(struct sk_buff *skb, struct net_device *dev);
  92 static void irport_change_speed(void *priv, __u32 speed);
  93 static int irport_net_open(struct net_device *dev);
  94 static int irport_net_close(struct net_device *dev);
  95
  96 static struct irport_cb *
  97 irport_open(int i, unsigned int iobase, unsigned int irq)
  98 {
  99         struct net_device *dev;
 100         struct irport_cb *self;
 101
 102         IRDA_DEBUG(1, "%s()\n", __FUNCTION__);
 103
 104         /* Lock the port that we need */
 105         if (!request_region(iobase, IO_EXTENT, driver_name)) {
 106                 IRDA_DEBUG(0, "%s(), can't get iobase of 0x%03x\n",
 107                            __FUNCTION__, iobase);
 108                 goto err_out1;
 109         }
 110
 111         /*
 112          *  Allocate new instance of the driver
 113          */
 114         dev = alloc_irdadev(sizeof(struct irport_cb));
 115         if (!dev) {
 116                 IRDA_ERROR("%s(), can't allocate memory for "
 117                            "irda device!\n", __FUNCTION__);
 118                 goto err_out2;
 119         }
 120
 121         self = dev->priv;
 122         spin_lock_init(&self->lock);
 123
 124         /* Need to store self somewhere */
 125         dev_self[i] = self;
 126         self->priv = self;
 127         self->index = i;
 128
 129         /* Initialize IO */
 130         self->io.sir_base  = iobase;
 131         self->io.sir_ext   = IO_EXTENT;
 132         self->io.irq       = irq;
 133         self->io.fifo_size = 16;                /* 16550A and compatible */
 134
 135         /* Initialize QoS for this device */
 136         irda_init_max_qos_capabilies(&self->qos);
 137
 138         self->qos.baud_rate.bits = IR_9600|IR_19200|IR_38400|IR_57600|
 139                 IR_115200;
 140
 141         self->qos.min_turn_time.bits = qos_mtt_bits;
 142         irda_qos_bits_to_value(&self->qos);
 143
 144         /* Bootstrap ZeroCopy Rx */
 145         self->rx_buff.truesize = IRDA_SKB_MAX_MTU;
 146         self->rx_buff.skb = __dev_alloc_skb(self->rx_buff.truesize,
 147                                             GFP_KERNEL);
 148         if (self->rx_buff.skb == NULL) {
 149                 IRDA_ERROR("%s(), can't allocate memory for "
 150                            "receive buffer!\n", __FUNCTION__);
 151                 goto err_out3;
 152         }
 153         skb_reserve(self->rx_buff.skb, 1);
 154         self->rx_buff.head = self->rx_buff.skb->data;
 155         /* No need to memset the buffer, unless you are really pedantic */
 156
 157         /* Finish setup the Rx buffer descriptor */
 158         self->rx_buff.in_frame = FALSE;
 159         self->rx_buff.state = OUTSIDE_FRAME;
 160         self->rx_buff.data = self->rx_buff.head;
 161
 162         /* Specify how much memory we want */
 163         self->tx_buff.truesize = 4000;
 164
 165         /* Allocate memory if needed */
 166         if (self->tx_buff.truesize > 0) {
 167                 self->tx_buff.head = kzalloc(self->tx_buff.truesize,
 168                                                       GFP_KERNEL);
 169                 if (self->tx_buff.head == NULL) {
 170                         IRDA_ERROR("%s(), can't allocate memory for "
 171                                    "transmit buffer!\n", __FUNCTION__);
 172                         goto err_out4;
 173                 }
 174         }
 175         self->tx_buff.data = self->tx_buff.head;
 176
 177         self->netdev = dev;
 178         /* Keep track of module usage */
 179         SET_MODULE_OWNER(dev);
 180
 181         /* May be overridden by piggyback drivers */
 182         self->interrupt    = irport_interrupt;
 183         self->change_speed = irport_change_speed;
 184
 185         /* Override the network functions we need to use */
 186         dev->hard_start_xmit = irport_hard_xmit;
 187         dev->tx_timeout      = irport_timeout;
 188         dev->watchdog_timeo  = HZ;  /* Allow time enough for speed change */
 189         dev->open            = irport_net_open;
 190         dev->stop            = irport_net_close;
 191         dev->get_stats       = irport_net_get_stats;
 192         dev->do_ioctl        = irport_net_ioctl;
 193
 194         /* Make ifconfig display some details */
 195         dev->base_addr = iobase;
 196         dev->irq = irq;
 197
 198         if (register_netdev(dev)) {
 199                 IRDA_ERROR("%s(), register_netdev() failed!\n", __FUNCTION__);
 200                 goto err_out5;
 201         }
 202         IRDA_MESSAGE("IrDA: Registered device %s (irport io=0x%X irq=%d)\n",
 203                 dev->name, iobase, irq);
 204
 205         return self;
 206  err_out5:
 207         kfree(self->tx_buff.head);
 208  err_out4:
 209         kfree_skb(self->rx_buff.skb);
 210  err_out3:
 211         free_netdev(dev);
 212         dev_self[i] = NULL;
 213  err_out2:
 214         release_region(iobase, IO_EXTENT);
 215  err_out1:
 216         return NULL;
 217 }
 218
 219 static int irport_close(struct irport_cb *self)
 220 {
 221         IRDA_ASSERT(self != NULL, return -1;);
 222
 223         /* We are not using any dongle anymore! */
 224         if (self->dongle)
 225                 irda_device_dongle_cleanup(self->dongle);
 226         self->dongle = NULL;
 227
 228         /* Remove netdevice */
 229         unregister_netdev(self->netdev);
 230
 231         /* Release the IO-port that this driver is using */
 232         IRDA_DEBUG(0 , "%s(), Releasing Region %03x\n",
 233                    __FUNCTION__, self->io.sir_base);
 234         release_region(self->io.sir_base, self->io.sir_ext);
 235
 236         kfree(self->tx_buff.head);
 237
 238         if (self->rx_buff.skb)
 239                 kfree_skb(self->rx_buff.skb);
 240         self->rx_buff.skb = NULL;
 241
 242         /* Remove ourselves */
 243         dev_self[self->index] = NULL;
 244         free_netdev(self->netdev);
 245
 246         return 0;
 247 }
 248
 249 static void irport_stop(struct irport_cb *self)
 250 {
 251         int iobase;
 252
 253         iobase = self->io.sir_base;
 254
 255         /* We can't lock, we may be called from a FIR driver - Jean II */
 256
 257         /* We are not transmitting any more */
 258         self->transmitting = 0;
 259
 260         /* Reset UART */
 261         outb(0, iobase+UART_MCR);
 262
 263         /* Turn off interrupts */
 264         outb(0, iobase+UART_IER);
 265 }
 266
 267 static void irport_start(struct irport_cb *self)
 268 {
 269         int iobase;
 270
 271         iobase = self->io.sir_base;
 272
 273         irport_stop(self);
 274
 275         /* We can't lock, we may be called from a FIR driver - Jean II */
 276
 277         /* Initialize UART */
 278         outb(UART_LCR_WLEN8, iobase+UART_LCR);  /* Reset DLAB */
 279         outb((UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2), iobase+UART_MCR);
 280
 281         /* Turn on interrups */
 282         outb(UART_IER_RLSI | UART_IER_RDI |UART_IER_THRI, iobase+UART_IER);
 283 }
 284
 285 /*
 286  * Function irport_get_fcr (speed)
 287  *
 288  *    Compute value of fcr
 289  *
 290  */
 291 static inline unsigned int irport_get_fcr(__u32 speed)
 292 {
 293         unsigned int fcr;    /* FIFO control reg */
 294
 295         /* Enable fifos */
 296         fcr = UART_FCR_ENABLE_FIFO;
 297
 298         /*
 299          * Use trigger level 1 to avoid 3 ms. timeout delay at 9600 bps, and
 300          * almost 1,7 ms at 19200 bps. At speeds above that we can just forget
 301          * about this timeout since it will always be fast enough.
 302          */
 303         if (speed < 38400)
 304                 fcr |= UART_FCR_TRIGGER_1;
 305         else
 306                 //fcr |= UART_FCR_TRIGGER_14;
 307                 fcr |= UART_FCR_TRIGGER_8;
 308
 309         return(fcr);
 310 }
 311
 312 /*
 313  * Function irport_change_speed (self, speed)
 314  *
 315  *    Set speed of IrDA port to specified baudrate
 316  *
 317  * This function should be called with irq off and spin-lock.
 318  */
 319 static void irport_change_speed(void *priv, __u32 speed)
 320 {
 321         struct irport_cb *self = (struct irport_cb *) priv;
 322         int iobase;
 323         unsigned int fcr;    /* FIFO control reg */
 324         unsigned int lcr;    /* Line control reg */
 325         int divisor;
 326
 327         IRDA_ASSERT(self != NULL, return;);
 328         IRDA_ASSERT(speed != 0, return;);
 329
 330         IRDA_DEBUG(1, "%s(), Setting speed to: %d - iobase=%#x\n",
 331                     __FUNCTION__, speed, self->io.sir_base);
 332
 333         /* We can't lock, we may be called from a FIR driver - Jean II */
 334
 335         iobase = self->io.sir_base;
 336
 337         /* Update accounting for new speed */
 338         self->io.speed = speed;
 339
 340         /* Turn off interrupts */
 341         outb(0, iobase+UART_IER);
 342
 343         divisor = SPEED_MAX/speed;
 344
 345         /* Get proper fifo configuration */
 346         fcr = irport_get_fcr(speed);
 347
 348         /* IrDA ports use 8N1 */
 349         lcr = UART_LCR_WLEN8;
 350
 351         outb(UART_LCR_DLAB | lcr, iobase+UART_LCR); /* Set DLAB */
 352         outb(divisor & 0xff,      iobase+UART_DLL); /* Set speed */
 353         outb(divisor >> 8,        iobase+UART_DLM);
 354         outb(lcr,                 iobase+UART_LCR); /* Set 8N1  */
 355         outb(fcr,                 iobase+UART_FCR); /* Enable FIFO's */
 356
 357         /* Turn on interrups */
 358         /* This will generate a fatal interrupt storm.
 359          * People calling us will do that properly - Jean II */
 360         //outb(/*UART_IER_RLSI|*/UART_IER_RDI/*|UART_IER_THRI*/, iobase+UART_IER);
 361 }
 362
 363 /*
 364  * Function __irport_change_speed (instance, state, param)
 365  *
 366  *    State machine for changing speed of the device. We do it this way since
 367  *    we cannot use schedule_timeout() when we are in interrupt context
 368  *
 369  */
 370 static int __irport_change_speed(struct irda_task *task)
 371 {
 372         struct irport_cb *self;
 373         __u32 speed = (__u32) task->param;
 374         unsigned long flags = 0;
 375         int wasunlocked = 0;
 376         int ret = 0;
 377
 378         IRDA_DEBUG(2, "%s(), <%ld>\n", __FUNCTION__, jiffies);
 379
 380         self = (struct irport_cb *) task->instance;
 381
 382         IRDA_ASSERT(self != NULL, return -1;);
 383
 384         /* Locking notes : this function may be called from irq context with
 385          * spinlock, via irport_write_wakeup(), or from non-interrupt without
 386          * spinlock (from the task timer). Yuck !
 387          * This is ugly, and unsafe is the spinlock is not already acquired.
 388          * This will be fixed when irda-task get rewritten.
 389          * Jean II */
 390         if (!spin_is_locked(&self->lock)) {
 391                 spin_lock_irqsave(&self->lock, flags);
 392                 wasunlocked = 1;
 393         }
 394
 395         switch (task->state) {
 396         case IRDA_TASK_INIT:
 397         case IRDA_TASK_WAIT:
 398                 /* Are we ready to change speed yet? */
 399                 if (self->tx_buff.len > 0) {
 400                         task->state = IRDA_TASK_WAIT;
 401
 402                         /* Try again later */
 403                         ret = msecs_to_jiffies(20);
 404                         break;
 405                 }
 406
 407                 if (self->dongle)
 408                         irda_task_next_state(task, IRDA_TASK_CHILD_INIT);
 409                 else
 410                         irda_task_next_state(task, IRDA_TASK_CHILD_DONE);
 411                 break;
 412         case IRDA_TASK_CHILD_INIT:
 413                 /* Go to default speed */
 414                 self->change_speed(self->priv, 9600);
 415
 416                 /* Change speed of dongle */
 417                 if (irda_task_execute(self->dongle,
 418                                       self->dongle->issue->change_speed,
 419                                       NULL, task, (void *) speed))
 420                 {
 421                         /* Dongle need more time to change its speed */
 422                         irda_task_next_state(task, IRDA_TASK_CHILD_WAIT);
 423
 424                         /* Give dongle 1 sec to finish */
 425                         ret = msecs_to_jiffies(1000);
 426                 } else
 427                         /* Child finished immediately */
 428                         irda_task_next_state(task, IRDA_TASK_CHILD_DONE);
 429                 break;
 430         case IRDA_TASK_CHILD_WAIT:
 431                 IRDA_WARNING("%s(), changing speed of dongle timed out!\n", __FUNCTION__);
 432                 ret = -1;
 433                 break;
 434         case IRDA_TASK_CHILD_DONE:
 435                 /* Finally we are ready to change the speed */
 436                 self->change_speed(self->priv, speed);
 437
 438                 irda_task_next_state(task, IRDA_TASK_DONE);
 439                 break;
 440         default:
 441                 IRDA_ERROR("%s(), unknown state %d\n",
 442                            __FUNCTION__, task->state);
 443                 irda_task_next_state(task, IRDA_TASK_DONE);
 444                 ret = -1;
 445                 break;
 446         }
 447         /* Put stuff in the state we found them - Jean II */
 448         if(wasunlocked) {
 449                 spin_unlock_irqrestore(&self->lock, flags);
 450         }
 451
 452         return ret;
 453 }
 454
 455 /*
 456  * Function irport_change_speed_complete (task)
 457  *
 458  *    Called when the change speed operation completes
 459  *
 460  */
 461 static int irport_change_speed_complete(struct irda_task *task)
 462 {
 463         struct irport_cb *self;
 464
 465         IRDA_DEBUG(1, "%s()\n", __FUNCTION__);
 466
 467         self = (struct irport_cb *) task->instance;
 468
 469         IRDA_ASSERT(self != NULL, return -1;);
 470         IRDA_ASSERT(self->netdev != NULL, return -1;);
 471
 472         /* Finished changing speed, so we are not busy any longer */
 473         /* Signal network layer so it can try to send the frame */
 474
 475         netif_wake_queue(self->netdev);
 476
 477         return 0;
 478 }
 479
 480 /*
 481  * Function irport_timeout (struct net_device *dev)
 482  *
 483  *    The networking layer thinks we timed out.
 484  *
 485  */
 486
 487 static void irport_timeout(struct net_device *dev)
 488 {
 489         struct irport_cb *self;
 490         int iobase;
 491         int iir, lsr;
 492         unsigned long flags;
 493
 494         self = (struct irport_cb *) dev->priv;
 495         IRDA_ASSERT(self != NULL, return;);
 496         iobase = self->io.sir_base;
 497
 498         IRDA_WARNING("%s: transmit timed out, jiffies = %ld, trans_start = %ld\n",
 499                 dev->name, jiffies, dev->trans_start);
 500         spin_lock_irqsave(&self->lock, flags);
 501
 502         /* Debug what's happening... */
 503
 504         /* Get interrupt status */
 505         lsr = inb(iobase+UART_LSR);
 506         /* Read interrupt register */
 507         iir = inb(iobase+UART_IIR);
 508         IRDA_DEBUG(0, "%s(), iir=%02x, lsr=%02x, iobase=%#x\n",
 509                    __FUNCTION__, iir, lsr, iobase);
 510
 511         IRDA_DEBUG(0, "%s(), transmitting=%d, remain=%d, done=%td\n",
 512                    __FUNCTION__, self->transmitting, self->tx_buff.len,
 513                    self->tx_buff.data - self->tx_buff.head);
 514
 515         /* Now, restart the port */
 516         irport_start(self);
 517         self->change_speed(self->priv, self->io.speed);
 518         /* This will re-enable irqs */
 519         outb(/*UART_IER_RLSI|*/UART_IER_RDI/*|UART_IER_THRI*/, iobase+UART_IER);
 520         dev->trans_start = jiffies;
 521         spin_unlock_irqrestore(&self->lock, flags);
 522
 523         netif_wake_queue(dev);
 524 }
 525
 526 /*
 527  * Function irport_wait_hw_transmitter_finish ()
 528  *
 529  *    Wait for the real end of HW transmission
 530  *
 531  * The UART is a strict FIFO, and we get called only when we have finished
 532  * pushing data to the FIFO, so the maximum amount of time we must wait
 533  * is only for the FIFO to drain out.
 534  *
 535  * We use a simple calibrated loop. We may need to adjust the loop
 536  * delay (udelay) to balance I/O traffic and latency. And we also need to
 537  * adjust the maximum timeout.
 538  * It would probably be better to wait for the proper interrupt,
 539  * but it doesn't seem to be available.
 540  *
 541  * We can't use jiffies or kernel timers because :
 542  * 1) We are called from the interrupt handler, which disable softirqs,
 543  * so jiffies won't be increased
 544  * 2) Jiffies granularity is usually very coarse (10ms), and we don't
 545  * want to wait that long to detect stuck hardware.
 546  * Jean II
 547  */
 548
 549 static void irport_wait_hw_transmitter_finish(struct irport_cb *self)
 550 {
 551         int iobase;
 552         int count = 1000;       /* 1 ms */
 553
 554         iobase = self->io.sir_base;
 555
 556         /* Calibrated busy loop */
 557         while((count-- > 0) && !(inb(iobase+UART_LSR) & UART_LSR_TEMT))
 558                 udelay(1);
 559
 560         if(count == 0)
 561                 IRDA_DEBUG(0, "%s(): stuck transmitter\n", __FUNCTION__);
 562 }
 563
 564 /*
 565  * Function irport_hard_start_xmit (struct sk_buff *skb, struct net_device *dev)
 566  *
 567  *    Transmits the current frame until FIFO is full, then
 568  *    waits until the next transmitt interrupt, and continues until the
 569  *    frame is transmitted.
 570  */
 571 static int irport_hard_xmit(struct sk_buff *skb, struct net_device *dev)
 572 {
 573         struct irport_cb *self;
 574         unsigned long flags;
 575         int iobase;
 576         s32 speed;
 577
 578         IRDA_DEBUG(1, "%s()\n", __FUNCTION__);
 579
 580         IRDA_ASSERT(dev != NULL, return 0;);
 581
 582         self = (struct irport_cb *) dev->priv;
 583         IRDA_ASSERT(self != NULL, return 0;);
 584
 585         iobase = self->io.sir_base;
 586
 587         netif_stop_queue(dev);
 588
 589         /* Make sure tests & speed change are atomic */
 590         spin_lock_irqsave(&self->lock, flags);
 591
 592         /* Check if we need to change the speed */
 593         speed = irda_get_next_speed(skb);
 594         if ((speed != self->io.speed) && (speed != -1)) {
 595                 /* Check for empty frame */
 596                 if (!skb->len) {
 597                         /*
 598                          * We send frames one by one in SIR mode (no
 599                          * pipelining), so at this point, if we were sending
 600                          * a previous frame, we just received the interrupt
 601                          * telling us it is finished (UART_IIR_THRI).
 602                          * Therefore, waiting for the transmitter to really
 603                          * finish draining the fifo won't take too long.
 604                          * And the interrupt handler is not expected to run.
 605                          * - Jean II */
 606                         irport_wait_hw_transmitter_finish(self);
 607                         /* Better go there already locked - Jean II */
 608                         irda_task_execute(self, __irport_change_speed,
 609                                           irport_change_speed_complete,
 610                                           NULL, (void *) speed);
 611                         dev->trans_start = jiffies;
 612                         spin_unlock_irqrestore(&self->lock, flags);
 613                         dev_kfree_skb(skb);
 614                         return 0;
 615                 } else
 616                         self->new_speed = speed;
 617         }
 618
 619         /* Init tx buffer */
 620         self->tx_buff.data = self->tx_buff.head;
 621
 622         /* Copy skb to tx_buff while wrapping, stuffing and making CRC */
 623         self->tx_buff.len = async_wrap_skb(skb, self->tx_buff.data,
 624                                            self->tx_buff.truesize);
 625
 626         self->stats.tx_bytes += self->tx_buff.len;
 627
 628         /* We are transmitting */
 629         self->transmitting = 1;
 630
 631         /* Turn on transmit finished interrupt. Will fire immediately!  */
 632         outb(UART_IER_THRI, iobase+UART_IER);
 633
 634         dev->trans_start = jiffies;
 635         spin_unlock_irqrestore(&self->lock, flags);
 636
 637         dev_kfree_skb(skb);
 638
 639         return 0;
 640 }
 641
 642 /*
 643  * Function irport_write (driver)
 644  *
 645  *    Fill Tx FIFO with transmit data
 646  *
 647  * Called only from irport_write_wakeup()
 648  */
 649 static inline int irport_write(int iobase, int fifo_size, __u8 *buf, int len)
 650 {
 651         int actual = 0;
 652
 653         /* Fill FIFO with current frame */
 654         while ((actual < fifo_size) && (actual < len)) {
 655                 /* Transmit next byte */
 656                 outb(buf[actual], iobase+UART_TX);
 657
 658                 actual++;
 659         }
 660
 661         return actual;
 662 }
 663
 664 /*
 665  * Function irport_write_wakeup (tty)
 666  *
 667  *    Called by the driver when there's room for more data.  If we have
 668  *    more packets to send, we send them here.
 669  *
 670  * Called only from irport_interrupt()
 671  * Make sure this function is *not* called while we are receiving,
 672  * otherwise we will reset fifo and loose data :-(
 673  */
 674 static inline void irport_write_wakeup(struct irport_cb *self)
 675 {
 676         int actual = 0;
 677         int iobase;
 678         unsigned int fcr;
 679
 680         IRDA_ASSERT(self != NULL, return;);
 681
 682         IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
 683
 684         iobase = self->io.sir_base;
 685
 686         /* Finished with frame?  */
 687         if (self->tx_buff.len > 0)  {
 688                 /* Write data left in transmit buffer */
 689                 actual = irport_write(iobase, self->io.fifo_size,
 690                                       self->tx_buff.data, self->tx_buff.len);
 691                 self->tx_buff.data += actual;
 692                 self->tx_buff.len  -= actual;
 693         } else {
 694                 /*
 695                  *  Now serial buffer is almost free & we can start
 696                  *  transmission of another packet. But first we must check
 697                  *  if we need to change the speed of the hardware
 698                  */
 699                 if (self->new_speed) {
 700                         irport_wait_hw_transmitter_finish(self);
 701                         irda_task_execute(self, __irport_change_speed,
 702                                           irport_change_speed_complete,
 703                                           NULL, (void *) self->new_speed);
 704                         self->new_speed = 0;
 705                 } else {
 706                         /* Tell network layer that we want more frames */
 707                         netif_wake_queue(self->netdev);
 708                 }
 709                 self->stats.tx_packets++;
 710
 711                 /*
 712                  * Reset Rx FIFO to make sure that all reflected transmit data
 713                  * is discarded. This is needed for half duplex operation
 714                  */
 715                 fcr = irport_get_fcr(self->io.speed);
 716                 fcr |= UART_FCR_CLEAR_RCVR;
 717                 outb(fcr, iobase+UART_FCR);
 718
 719                 /* Finished transmitting */
 720                 self->transmitting = 0;
 721
 722                 /* Turn on receive interrupts */
 723                 outb(UART_IER_RDI, iobase+UART_IER);
 724
 725                 IRDA_DEBUG(1, "%s() : finished Tx\n", __FUNCTION__);
 726         }
 727 }
 728
 729 /*
 730  * Function irport_receive (self)
 731  *
 732  *    Receive one frame from the infrared port
 733  *
 734  * Called only from irport_interrupt()
 735  */
 736 static inline void irport_receive(struct irport_cb *self)
 737 {
 738         int boguscount = 0;
 739         int iobase;
 740
 741         IRDA_ASSERT(self != NULL, return;);
 742
 743         iobase = self->io.sir_base;
 744
 745         /*
 746          * Receive all characters in Rx FIFO, unwrap and unstuff them.
 747          * async_unwrap_char will deliver all found frames
 748          */
 749         do {
 750                 async_unwrap_char(self->netdev, &self->stats, &self->rx_buff,
 751                                   inb(iobase+UART_RX));
 752
 753                 /* Make sure we don't stay here too long */
 754                 if (boguscount++ > 32) {
 755                         IRDA_DEBUG(2,"%s(), breaking!\n", __FUNCTION__);
 756                         break;
 757                 }
 758         } while (inb(iobase+UART_LSR) & UART_LSR_DR);
 759 }
 760
 761 /*
 762  * Function irport_interrupt (irq, dev_id)
 763  *
 764  *    Interrupt handler
 765  */
 766 static irqreturn_t irport_interrupt(int irq, void *dev_id)
 767 {
 768         struct net_device *dev = dev_id;
 769         struct irport_cb *self;
 770         int boguscount = 0;
 771         int iobase;
 772         int iir, lsr;
 773         int handled = 0;
 774
 775         self = dev->priv;
 776
 777         spin_lock(&self->lock);
 778
 779         iobase = self->io.sir_base;
 780
 781         /* Cut'n'paste interrupt routine from serial.c
 782          * This version try to minimise latency and I/O operations.
 783          * Simplified and modified to enforce half duplex operation.
 784          * - Jean II */
 785
 786         /* Check status even is iir reg is cleared, more robust and
 787          * eliminate a read on the I/O bus - Jean II */
 788         do {
 789                 /* Get interrupt status ; Clear interrupt */
 790                 lsr = inb(iobase+UART_LSR);
 791
 792                 /* Are we receiving or transmitting ? */
 793                 if(!self->transmitting) {
 794                         /* Received something ? */
 795                         if (lsr & UART_LSR_DR)
 796                                 irport_receive(self);
 797                 } else {
 798                         /* Room in Tx fifo ? */
 799                         if (lsr & (UART_LSR_THRE | UART_LSR_TEMT))
 800                                 irport_write_wakeup(self);
 801                 }
 802
 803                 /* A bit hackish, but working as expected... Jean II */
 804                 if(lsr & (UART_LSR_THRE | UART_LSR_TEMT | UART_LSR_DR))
 805                         handled = 1;
 806
 807                 /* Make sure we don't stay here to long */
 808                 if (boguscount++ > 10) {
 809                         IRDA_WARNING("%s() irq handler looping : lsr=%02x\n",
 810                                      __FUNCTION__, lsr);
 811                         break;
 812                 }
 813
 814                 /* Read interrupt register */
 815                 iir = inb(iobase+UART_IIR);
 816
 817                 /* Enable this debug only when no other options and at low
 818                  * bit rates, otherwise it may cause Rx overruns (lsr=63).
 819                  * - Jean II */
 820                 IRDA_DEBUG(6, "%s(), iir=%02x, lsr=%02x, iobase=%#x\n",
 821                             __FUNCTION__, iir, lsr, iobase);
 822
 823                 /* As long as interrupt pending... */
 824         } while ((iir & UART_IIR_NO_INT) == 0);
 825
 826         spin_unlock(&self->lock);
 827         return IRQ_RETVAL(handled);
 828 }
 829
 830 /*
 831  * Function irport_net_open (dev)
 832  *
 833  *    Network device is taken up. Usually this is done by "ifconfig irda0 up"
 834  *
 835  */
 836 static int irport_net_open(struct net_device *dev)
 837 {
 838         struct irport_cb *self;
 839         int iobase;
 840         char hwname[16];
 841         unsigned long flags;
 842
 843         IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
 844
 845         IRDA_ASSERT(dev != NULL, return -1;);
 846         self = (struct irport_cb *) dev->priv;
 847
 848         iobase = self->io.sir_base;
 849
 850         if (request_irq(self->io.irq, self->interrupt, 0, dev->name,
 851                         (void *) dev)) {
 852                 IRDA_DEBUG(0, "%s(), unable to allocate irq=%d\n",
 853                            __FUNCTION__, self->io.irq);
 854                 return -EAGAIN;
 855         }
 856
 857         spin_lock_irqsave(&self->lock, flags);
 858         /* Init uart */
 859         irport_start(self);
 860         /* Set 9600 bauds per default, including at the dongle */
 861         irda_task_execute(self, __irport_change_speed,
 862                           irport_change_speed_complete,
 863                           NULL, (void *) 9600);
 864         spin_unlock_irqrestore(&self->lock, flags);
 865
 866
 867         /* Give self a hardware name */
 868         sprintf(hwname, "SIR @ 0x%03x", self->io.sir_base);
 869
 870         /*
 871          * Open new IrLAP layer instance, now that everything should be
 872          * initialized properly
 873          */
 874         self->irlap = irlap_open(dev, &self->qos, hwname);
 875
 876         /* Ready to play! */
 877
 878         netif_start_queue(dev);
 879
 880         return 0;
 881 }
 882
 883 /*
 884  * Function irport_net_close (self)
 885  *
 886  *    Network device is taken down. Usually this is done by
 887  *    "ifconfig irda0 down"
 888  */
 889 static int irport_net_close(struct net_device *dev)
 890 {
 891         struct irport_cb *self;
 892         int iobase;
 893         unsigned long flags;
 894
 895         IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
 896
 897         IRDA_ASSERT(dev != NULL, return -1;);
 898         self = (struct irport_cb *) dev->priv;
 899
 900         IRDA_ASSERT(self != NULL, return -1;);
 901
 902         iobase = self->io.sir_base;
 903
 904         /* Stop device */
 905         netif_stop_queue(dev);
 906
 907         /* Stop and remove instance of IrLAP */
 908         if (self->irlap)
 909                 irlap_close(self->irlap);
 910         self->irlap = NULL;
 911
 912         spin_lock_irqsave(&self->lock, flags);
 913         irport_stop(self);
 914         spin_unlock_irqrestore(&self->lock, flags);
 915
 916         free_irq(self->io.irq, dev);
 917
 918         return 0;
 919 }
 920
 921 /*
 922  * Function irport_is_receiving (self)
 923  *
 924  *    Returns true is we are currently receiving data
 925  *
 926  */
 927 static inline int irport_is_receiving(struct irport_cb *self)
 928 {
 929         return (self->rx_buff.state != OUTSIDE_FRAME);
 930 }
 931
 932 /*
 933  * Function irport_set_dtr_rts (tty, dtr, rts)
 934  *
 935  *    This function can be used by dongles etc. to set or reset the status
 936  *    of the dtr and rts lines
 937  */
 938 static int irport_set_dtr_rts(struct net_device *dev, int dtr, int rts)
 939 {
 940         struct irport_cb *self = dev->priv;
 941         int iobase;
 942
 943         IRDA_ASSERT(self != NULL, return -1;);
 944
 945         iobase = self->io.sir_base;
 946
 947         if (dtr)
 948                 dtr = UART_MCR_DTR;
 949         if (rts)
 950                 rts = UART_MCR_RTS;
 951
 952         outb(dtr|rts|UART_MCR_OUT2, iobase+UART_MCR);
 953
 954         return 0;
 955 }
 956
 957 static int irport_raw_write(struct net_device *dev, __u8 *buf, int len)
 958 {
 959         struct irport_cb *self = (struct irport_cb *) dev->priv;
 960         int actual = 0;
 961         int iobase;
 962
 963         IRDA_ASSERT(self != NULL, return -1;);
 964
 965         iobase = self->io.sir_base;
 966
 967         /* Tx FIFO should be empty! */
 968         if (!(inb(iobase+UART_LSR) & UART_LSR_THRE)) {
 969                 IRDA_DEBUG( 0, "%s(), failed, fifo not empty!\n", __FUNCTION__);
 970                 return -1;
 971         }
 972
 973         /* Fill FIFO with current frame */
 974         while (actual < len) {
 975                 /* Transmit next byte */
 976                 outb(buf[actual], iobase+UART_TX);
 977                 actual++;
 978         }
 979
 980         return actual;
 981 }
 982
 983 /*
 984  * Function irport_net_ioctl (dev, rq, cmd)
 985  *
 986  *    Process IOCTL commands for this device
 987  *
 988  */
 989 static int irport_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
 990 {
 991         struct if_irda_req *irq = (struct if_irda_req *) rq;
 992         struct irport_cb *self;
 993         dongle_t *dongle;
 994         unsigned long flags;
 995         int ret = 0;
 996
 997         IRDA_ASSERT(dev != NULL, return -1;);
 998
 999         self = dev->priv;
1000
1001         IRDA_ASSERT(self != NULL, return -1;);
1002
1003         IRDA_DEBUG(2, "%s(), %s, (cmd=0x%X)\n", __FUNCTION__, dev->name, cmd);
1004
1005         switch (cmd) {
1006         case SIOCSBANDWIDTH: /* Set bandwidth */
1007                 if (!capable(CAP_NET_ADMIN))
1008                         ret = -EPERM;
1009                 else
1010                         irda_task_execute(self, __irport_change_speed, NULL,
1011                                           NULL, (void *) irq->ifr_baudrate);
1012                 break;
1013         case SIOCSDONGLE: /* Set dongle */
1014                 if (!capable(CAP_NET_ADMIN)) {
1015                         ret = -EPERM;
1016                         break;
1017                 }
1018
1019                 /* Locking :
1020                  * irda_device_dongle_init() can't be locked.
1021                  * irda_task_execute() doesn't need to be locked.
1022                  * Jean II
1023                  */
1024
1025                 /* Initialize dongle */
1026                 dongle = irda_device_dongle_init(dev, irq->ifr_dongle);
1027                 if (!dongle)
1028                         break;
1029
1030                 dongle->set_mode    = NULL;
1031                 dongle->read        = NULL;
1032                 dongle->write       = irport_raw_write;
1033                 dongle->set_dtr_rts = irport_set_dtr_rts;
1034
1035                 /* Now initialize the dongle!  */
1036                 dongle->issue->open(dongle, &self->qos);
1037
1038                 /* Reset dongle */
1039                 irda_task_execute(dongle, dongle->issue->reset, NULL, NULL,
1040                                   NULL);
1041
1042                 /* Make dongle available to driver only now to avoid
1043                  * race conditions - Jean II */
1044                 self->dongle = dongle;
1045                 break;
1046         case SIOCSMEDIABUSY: /* Set media busy */
1047                 if (!capable(CAP_NET_ADMIN)) {
1048                         ret = -EPERM;
1049                         break;
1050                 }
1051
1052                 irda_device_set_media_busy(self->netdev, TRUE);
1053                 break;
1054         case SIOCGRECEIVING: /* Check if we are receiving right now */
1055                 irq->ifr_receiving = irport_is_receiving(self);
1056                 break;
1057         case SIOCSDTRRTS:
1058                 if (!capable(CAP_NET_ADMIN)) {
1059                         ret = -EPERM;
1060                         break;
1061                 }
1062
1063                 /* No real need to lock... */
1064                 spin_lock_irqsave(&self->lock, flags);
1065                 irport_set_dtr_rts(dev, irq->ifr_dtr, irq->ifr_rts);
1066                 spin_unlock_irqrestore(&self->lock, flags);
1067                 break;
1068         default:
1069                 ret = -EOPNOTSUPP;
1070         }
1071
1072         return ret;
1073 }
1074
1075 static struct net_device_stats *irport_net_get_stats(struct net_device *dev)
1076 {
1077         struct irport_cb *self = (struct irport_cb *) dev->priv;
1078
1079         return &self->stats;
1080 }
1081
1082 static int __init irport_init(void)
1083 {
1084         int i;
1085
1086         for (i=0; (io[i] < 2000) && (i < ARRAY_SIZE(dev_self)); i++) {
1087                 if (irport_open(i, io[i], irq[i]) != NULL)
1088                         return 0;
1089         }
1090         /*
1091          * Maybe something failed, but we can still be usable for FIR drivers
1092          */
1093         return 0;
1094 }
1095
1096 /*
1097  * Function irport_cleanup ()
1098  *
1099  *    Close all configured ports
1100  *
1101  */
1102 static void __exit irport_cleanup(void)
1103 {
1104         int i;
1105
1106         IRDA_DEBUG( 4, "%s()\n", __FUNCTION__);
1107
1108         for (i=0; i < ARRAY_SIZE(dev_self); i++) {
1109                 if (dev_self[i])
1110                         irport_close(dev_self[i]);
1111         }
1112 }
1113
1114 module_param_array(io, int, NULL, 0);
1115 MODULE_PARM_DESC(io, "Base I/O addresses");
1116 module_param_array(irq, int, NULL, 0);
1117 MODULE_PARM_DESC(irq, "IRQ lines");
1118
1119 MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
1120 MODULE_DESCRIPTION("Half duplex serial driver for IrDA SIR mode");
1121 MODULE_LICENSE("GPL");
1122
1123 module_init(irport_init);
1124 module_exit(irport_cleanup);
1125