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                                     struct pt_regs *regs);
  92 static int irport_hard_xmit(struct sk_buff *skb, struct net_device *dev);
  93 static void irport_change_speed(void *priv, __u32 speed);
  94 static int irport_net_open(struct net_device *dev);
  95 static int irport_net_close(struct net_device *dev);
  96
  97 static struct irport_cb *
  98 irport_open(int i, unsigned int iobase, unsigned int irq)
  99 {
 100         struct net_device *dev;
 101         struct irport_cb *self;
 102
 103         IRDA_DEBUG(1, "%s()\n", __FUNCTION__);
 104
 105         /* Lock the port that we need */
 106         if (!request_region(iobase, IO_EXTENT, driver_name)) {
 107                 IRDA_DEBUG(0, "%s(), can't get iobase of 0x%03x\n",
 108                            __FUNCTION__, iobase);
 109                 goto err_out1;
 110         }
 111
 112         /*
 113          *  Allocate new instance of the driver
 114          */
 115         dev = alloc_irdadev(sizeof(struct irport_cb));
 116         if (!dev) {
 117                 IRDA_ERROR("%s(), can't allocate memory for "
 118                            "irda device!\n", __FUNCTION__);
 119                 goto err_out2;
 120         }
 121
 122         self = dev->priv;
 123         spin_lock_init(&self->lock);
 124
 125         /* Need to store self somewhere */
 126         dev_self[i] = self;
 127         self->priv = self;
 128         self->index = i;
 129
 130         /* Initialize IO */
 131         self->io.sir_base  = iobase;
 132         self->io.sir_ext   = IO_EXTENT;
 133         self->io.irq       = irq;
 134         self->io.fifo_size = 16;                /* 16550A and compatible */
 135
 136         /* Initialize QoS for this device */
 137         irda_init_max_qos_capabilies(&self->qos);
 138
 139         self->qos.baud_rate.bits = IR_9600|IR_19200|IR_38400|IR_57600|
 140                 IR_115200;
 141
 142         self->qos.min_turn_time.bits = qos_mtt_bits;
 143         irda_qos_bits_to_value(&self->qos);
 144
 145         /* Bootstrap ZeroCopy Rx */
 146         self->rx_buff.truesize = IRDA_SKB_MAX_MTU;
 147         self->rx_buff.skb = __dev_alloc_skb(self->rx_buff.truesize,
 148                                             GFP_KERNEL);
 149         if (self->rx_buff.skb == NULL) {
 150                 IRDA_ERROR("%s(), can't allocate memory for "
 151                            "receive buffer!\n", __FUNCTION__);
 152                 goto err_out3;
 153         }
 154         skb_reserve(self->rx_buff.skb, 1);
 155         self->rx_buff.head = self->rx_buff.skb->data;
 156         /* No need to memset the buffer, unless you are really pedantic */
 157
 158         /* Finish setup the Rx buffer descriptor */
 159         self->rx_buff.in_frame = FALSE;
 160         self->rx_buff.state = OUTSIDE_FRAME;
 161         self->rx_buff.data = self->rx_buff.head;
 162
 163         /* Specify how much memory we want */
 164         self->tx_buff.truesize = 4000;
 165
 166         /* Allocate memory if needed */
 167         if (self->tx_buff.truesize > 0) {
 168                 self->tx_buff.head = (__u8 *) kmalloc(self->tx_buff.truesize,
 169                                                       GFP_KERNEL);
 170                 if (self->tx_buff.head == NULL) {
 171                         IRDA_ERROR("%s(), can't allocate memory for "
 172                                    "transmit buffer!\n", __FUNCTION__);
 173                         goto err_out4;
 174                 }
 175                 memset(self->tx_buff.head, 0, self->tx_buff.truesize);
 176         }
 177         self->tx_buff.data = self->tx_buff.head;
 178
 179         self->netdev = dev;
 180         /* Keep track of module usage */
 181         SET_MODULE_OWNER(dev);
 182
 183         /* May be overridden by piggyback drivers */
 184         self->interrupt    = irport_interrupt;
 185         self->change_speed = irport_change_speed;
 186
 187         /* Override the network functions we need to use */
 188         dev->hard_start_xmit = irport_hard_xmit;
 189         dev->tx_timeout      = irport_timeout;
 190         dev->watchdog_timeo  = HZ;  /* Allow time enough for speed change */
 191         dev->open            = irport_net_open;
 192         dev->stop            = irport_net_close;
 193         dev->get_stats       = irport_net_get_stats;
 194         dev->do_ioctl        = irport_net_ioctl;
 195
 196         /* Make ifconfig display some details */
 197         dev->base_addr = iobase;
 198         dev->irq = irq;
 199
 200         if (register_netdev(dev)) {
 201                 IRDA_ERROR("%s(), register_netdev() failed!\n", __FUNCTION__);
 202                 goto err_out5;
 203         }
 204         IRDA_MESSAGE("IrDA: Registered device %s (irport io=0x%X irq=%d)\n",
 205                 dev->name, iobase, irq);
 206
 207         return self;
 208  err_out5:
 209         kfree(self->tx_buff.head);
 210  err_out4:
 211         kfree_skb(self->rx_buff.skb);
 212  err_out3:
 213         free_netdev(dev);
 214         dev_self[i] = NULL;
 215  err_out2:
 216         release_region(iobase, IO_EXTENT);
 217  err_out1:
 218         return NULL;
 219 }
 220
 221 static int irport_close(struct irport_cb *self)
 222 {
 223         IRDA_ASSERT(self != NULL, return -1;);
 224
 225         /* We are not using any dongle anymore! */
 226         if (self->dongle)
 227                 irda_device_dongle_cleanup(self->dongle);
 228         self->dongle = NULL;
 229
 230         /* Remove netdevice */
 231         unregister_netdev(self->netdev);
 232
 233         /* Release the IO-port that this driver is using */
 234         IRDA_DEBUG(0 , "%s(), Releasing Region %03x\n",
 235                    __FUNCTION__, self->io.sir_base);
 236         release_region(self->io.sir_base, self->io.sir_ext);
 237
 238         kfree(self->tx_buff.head);
 239
 240         if (self->rx_buff.skb)
 241                 kfree_skb(self->rx_buff.skb);
 242         self->rx_buff.skb = NULL;
 243
 244         /* Remove ourselves */
 245         dev_self[self->index] = NULL;
 246         free_netdev(self->netdev);
 247
 248         return 0;
 249 }
 250
 251 static void irport_stop(struct irport_cb *self)
 252 {
 253         int iobase;
 254
 255         iobase = self->io.sir_base;
 256
 257         /* We can't lock, we may be called from a FIR driver - Jean II */
 258
 259         /* We are not transmitting any more */
 260         self->transmitting = 0;
 261
 262         /* Reset UART */
 263         outb(0, iobase+UART_MCR);
 264
 265         /* Turn off interrupts */
 266         outb(0, iobase+UART_IER);
 267 }
 268
 269 static void irport_start(struct irport_cb *self)
 270 {
 271         int iobase;
 272
 273         iobase = self->io.sir_base;
 274
 275         irport_stop(self);
 276
 277         /* We can't lock, we may be called from a FIR driver - Jean II */
 278
 279         /* Initialize UART */
 280         outb(UART_LCR_WLEN8, iobase+UART_LCR);  /* Reset DLAB */
 281         outb((UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2), iobase+UART_MCR);
 282
 283         /* Turn on interrups */
 284         outb(UART_IER_RLSI | UART_IER_RDI |UART_IER_THRI, iobase+UART_IER);
 285 }
 286
 287 /*
 288  * Function irport_get_fcr (speed)
 289  *
 290  *    Compute value of fcr
 291  *
 292  */
 293 static inline unsigned int irport_get_fcr(__u32 speed)
 294 {
 295         unsigned int fcr;    /* FIFO control reg */
 296
 297         /* Enable fifos */
 298         fcr = UART_FCR_ENABLE_FIFO;
 299
 300         /*
 301          * Use trigger level 1 to avoid 3 ms. timeout delay at 9600 bps, and
 302          * almost 1,7 ms at 19200 bps. At speeds above that we can just forget
 303          * about this timeout since it will always be fast enough.
 304          */
 305         if (speed < 38400)
 306                 fcr |= UART_FCR_TRIGGER_1;
 307         else
 308                 //fcr |= UART_FCR_TRIGGER_14;
 309                 fcr |= UART_FCR_TRIGGER_8;
 310
 311         return(fcr);
 312 }
 313
 314 /*
 315  * Function irport_change_speed (self, speed)
 316  *
 317  *    Set speed of IrDA port to specified baudrate
 318  *
 319  * This function should be called with irq off and spin-lock.
 320  */
 321 static void irport_change_speed(void *priv, __u32 speed)
 322 {
 323         struct irport_cb *self = (struct irport_cb *) priv;
 324         int iobase;
 325         unsigned int fcr;    /* FIFO control reg */
 326         unsigned int lcr;    /* Line control reg */
 327         int divisor;
 328
 329         IRDA_ASSERT(self != NULL, return;);
 330         IRDA_ASSERT(speed != 0, return;);
 331
 332         IRDA_DEBUG(1, "%s(), Setting speed to: %d - iobase=%#x\n",
 333                     __FUNCTION__, speed, self->io.sir_base);
 334
 335         /* We can't lock, we may be called from a FIR driver - Jean II */
 336
 337         iobase = self->io.sir_base;
 338
 339         /* Update accounting for new speed */
 340         self->io.speed = speed;
 341
 342         /* Turn off interrupts */
 343         outb(0, iobase+UART_IER);
 344
 345         divisor = SPEED_MAX/speed;
 346
 347         /* Get proper fifo configuration */
 348         fcr = irport_get_fcr(speed);
 349
 350         /* IrDA ports use 8N1 */
 351         lcr = UART_LCR_WLEN8;
 352
 353         outb(UART_LCR_DLAB | lcr, iobase+UART_LCR); /* Set DLAB */
 354         outb(divisor & 0xff,      iobase+UART_DLL); /* Set speed */
 355         outb(divisor >> 8,        iobase+UART_DLM);
 356         outb(lcr,                 iobase+UART_LCR); /* Set 8N1  */
 357         outb(fcr,                 iobase+UART_FCR); /* Enable FIFO's */
 358
 359         /* Turn on interrups */
 360         /* This will generate a fatal interrupt storm.
 361          * People calling us will do that properly - Jean II */
 362         //outb(/*UART_IER_RLSI|*/UART_IER_RDI/*|UART_IER_THRI*/, iobase+UART_IER);
 363 }
 364
 365 /*
 366  * Function __irport_change_speed (instance, state, param)
 367  *
 368  *    State machine for changing speed of the device. We do it this way since
 369  *    we cannot use schedule_timeout() when we are in interrupt context
 370  *
 371  */
 372 static int __irport_change_speed(struct irda_task *task)
 373 {
 374         struct irport_cb *self;
 375         __u32 speed = (__u32) task->param;
 376         unsigned long flags = 0;
 377         int wasunlocked = 0;
 378         int ret = 0;
 379
 380         IRDA_DEBUG(2, "%s(), <%ld>\n", __FUNCTION__, jiffies);
 381
 382         self = (struct irport_cb *) task->instance;
 383
 384         IRDA_ASSERT(self != NULL, return -1;);
 385
 386         /* Locking notes : this function may be called from irq context with
 387          * spinlock, via irport_write_wakeup(), or from non-interrupt without
 388          * spinlock (from the task timer). Yuck !
 389          * This is ugly, and unsafe is the spinlock is not already acquired.
 390          * This will be fixed when irda-task get rewritten.
 391          * Jean II */
 392         if (!spin_is_locked(&self->lock)) {
 393                 spin_lock_irqsave(&self->lock, flags);
 394                 wasunlocked = 1;
 395         }
 396
 397         switch (task->state) {
 398         case IRDA_TASK_INIT:
 399         case IRDA_TASK_WAIT:
 400                 /* Are we ready to change speed yet? */
 401                 if (self->tx_buff.len > 0) {
 402                         task->state = IRDA_TASK_WAIT;
 403
 404                         /* Try again later */
 405                         ret = msecs_to_jiffies(20);
 406                         break;
 407                 }
 408
 409                 if (self->dongle)
 410                         irda_task_next_state(task, IRDA_TASK_CHILD_INIT);
 411                 else
 412                         irda_task_next_state(task, IRDA_TASK_CHILD_DONE);
 413                 break;
 414         case IRDA_TASK_CHILD_INIT:
 415                 /* Go to default speed */
 416                 self->change_speed(self->priv, 9600);
 417
 418                 /* Change speed of dongle */
 419                 if (irda_task_execute(self->dongle,
 420                                       self->dongle->issue->change_speed,
 421                                       NULL, task, (void *) speed))
 422                 {
 423                         /* Dongle need more time to change its speed */
 424                         irda_task_next_state(task, IRDA_TASK_CHILD_WAIT);
 425
 426                         /* Give dongle 1 sec to finish */
 427                         ret = msecs_to_jiffies(1000);
 428                 } else
 429                         /* Child finished immediately */
 430                         irda_task_next_state(task, IRDA_TASK_CHILD_DONE);
 431                 break;
 432         case IRDA_TASK_CHILD_WAIT:
 433                 IRDA_WARNING("%s(), changing speed of dongle timed out!\n", __FUNCTION__);
 434                 ret = -1;
 435                 break;
 436         case IRDA_TASK_CHILD_DONE:
 437                 /* Finally we are ready to change the speed */
 438                 self->change_speed(self->priv, speed);
 439
 440                 irda_task_next_state(task, IRDA_TASK_DONE);
 441                 break;
 442         default:
 443                 IRDA_ERROR("%s(), unknown state %d\n",
 444                            __FUNCTION__, task->state);
 445                 irda_task_next_state(task, IRDA_TASK_DONE);
 446                 ret = -1;
 447                 break;
 448         }
 449         /* Put stuff in the state we found them - Jean II */
 450         if(wasunlocked) {
 451                 spin_unlock_irqrestore(&self->lock, flags);
 452         }
 453
 454         return ret;
 455 }
 456
 457 /*
 458  * Function irport_change_speed_complete (task)
 459  *
 460  *    Called when the change speed operation completes
 461  *
 462  */
 463 static int irport_change_speed_complete(struct irda_task *task)
 464 {
 465         struct irport_cb *self;
 466
 467         IRDA_DEBUG(1, "%s()\n", __FUNCTION__);
 468
 469         self = (struct irport_cb *) task->instance;
 470
 471         IRDA_ASSERT(self != NULL, return -1;);
 472         IRDA_ASSERT(self->netdev != NULL, return -1;);
 473
 474         /* Finished changing speed, so we are not busy any longer */
 475         /* Signal network layer so it can try to send the frame */
 476
 477         netif_wake_queue(self->netdev);
 478
 479         return 0;
 480 }
 481
 482 /*
 483  * Function irport_timeout (struct net_device *dev)
 484  *
 485  *    The networking layer thinks we timed out.
 486  *
 487  */
 488
 489 static void irport_timeout(struct net_device *dev)
 490 {
 491         struct irport_cb *self;
 492         int iobase;
 493         int iir, lsr;
 494         unsigned long flags;
 495
 496         self = (struct irport_cb *) dev->priv;
 497         IRDA_ASSERT(self != NULL, return;);
 498         iobase = self->io.sir_base;
 499
 500         IRDA_WARNING("%s: transmit timed out, jiffies = %ld, trans_start = %ld\n",
 501                 dev->name, jiffies, dev->trans_start);
 502         spin_lock_irqsave(&self->lock, flags);
 503
 504         /* Debug what's happening... */
 505
 506         /* Get interrupt status */
 507         lsr = inb(iobase+UART_LSR);
 508         /* Read interrupt register */
 509         iir = inb(iobase+UART_IIR);
 510         IRDA_DEBUG(0, "%s(), iir=%02x, lsr=%02x, iobase=%#x\n",
 511                    __FUNCTION__, iir, lsr, iobase);
 512
 513         IRDA_DEBUG(0, "%s(), transmitting=%d, remain=%d, done=%d\n",
 514                    __FUNCTION__, self->transmitting, self->tx_buff.len,
 515                    self->tx_buff.data - self->tx_buff.head);
 516
 517         /* Now, restart the port */
 518         irport_start(self);
 519         self->change_speed(self->priv, self->io.speed);
 520         /* This will re-enable irqs */
 521         outb(/*UART_IER_RLSI|*/UART_IER_RDI/*|UART_IER_THRI*/, iobase+UART_IER);
 522         dev->trans_start = jiffies;
 523         spin_unlock_irqrestore(&self->lock, flags);
 524
 525         netif_wake_queue(dev);
 526 }
 527
 528 /*
 529  * Function irport_wait_hw_transmitter_finish ()
 530  *
 531  *    Wait for the real end of HW transmission
 532  *
 533  * The UART is a strict FIFO, and we get called only when we have finished
 534  * pushing data to the FIFO, so the maximum amount of time we must wait
 535  * is only for the FIFO to drain out.
 536  *
 537  * We use a simple calibrated loop. We may need to adjust the loop
 538  * delay (udelay) to balance I/O traffic and latency. And we also need to
 539  * adjust the maximum timeout.
 540  * It would probably be better to wait for the proper interrupt,
 541  * but it doesn't seem to be available.
 542  *
 543  * We can't use jiffies or kernel timers because :
 544  * 1) We are called from the interrupt handler, which disable softirqs,
 545  * so jiffies won't be increased
 546  * 2) Jiffies granularity is usually very coarse (10ms), and we don't
 547  * want to wait that long to detect stuck hardware.
 548  * Jean II
 549  */
 550
 551 static void irport_wait_hw_transmitter_finish(struct irport_cb *self)
 552 {
 553         int iobase;
 554         int count = 1000;       /* 1 ms */
 555
 556         iobase = self->io.sir_base;
 557
 558         /* Calibrated busy loop */
 559         while((count-- > 0) && !(inb(iobase+UART_LSR) & UART_LSR_TEMT))
 560                 udelay(1);
 561
 562         if(count == 0)
 563                 IRDA_DEBUG(0, "%s(): stuck transmitter\n", __FUNCTION__);
 564 }
 565
 566 /*
 567  * Function irport_hard_start_xmit (struct sk_buff *skb, struct net_device *dev)
 568  *
 569  *    Transmits the current frame until FIFO is full, then
 570  *    waits until the next transmitt interrupt, and continues until the
 571  *    frame is transmitted.
 572  */
 573 static int irport_hard_xmit(struct sk_buff *skb, struct net_device *dev)
 574 {
 575         struct irport_cb *self;
 576         unsigned long flags;
 577         int iobase;
 578         s32 speed;
 579
 580         IRDA_DEBUG(1, "%s()\n", __FUNCTION__);
 581
 582         IRDA_ASSERT(dev != NULL, return 0;);
 583
 584         self = (struct irport_cb *) dev->priv;
 585         IRDA_ASSERT(self != NULL, return 0;);
 586
 587         iobase = self->io.sir_base;
 588
 589         netif_stop_queue(dev);
 590
 591         /* Make sure tests & speed change are atomic */
 592         spin_lock_irqsave(&self->lock, flags);
 593
 594         /* Check if we need to change the speed */
 595         speed = irda_get_next_speed(skb);
 596         if ((speed != self->io.speed) && (speed != -1)) {
 597                 /* Check for empty frame */
 598                 if (!skb->len) {
 599                         /*
 600                          * We send frames one by one in SIR mode (no
 601                          * pipelining), so at this point, if we were sending
 602                          * a previous frame, we just received the interrupt
 603                          * telling us it is finished (UART_IIR_THRI).
 604                          * Therefore, waiting for the transmitter to really
 605                          * finish draining the fifo won't take too long.
 606                          * And the interrupt handler is not expected to run.
 607                          * - Jean II */
 608                         irport_wait_hw_transmitter_finish(self);
 609                         /* Better go there already locked - Jean II */
 610                         irda_task_execute(self, __irport_change_speed,
 611                                           irport_change_speed_complete,
 612                                           NULL, (void *) speed);
 613                         dev->trans_start = jiffies;
 614                         spin_unlock_irqrestore(&self->lock, flags);
 615                         dev_kfree_skb(skb);
 616                         return 0;
 617                 } else
 618                         self->new_speed = speed;
 619         }
 620
 621         /* Init tx buffer */
 622         self->tx_buff.data = self->tx_buff.head;
 623
 624         /* Copy skb to tx_buff while wrapping, stuffing and making CRC */
 625         self->tx_buff.len = async_wrap_skb(skb, self->tx_buff.data,
 626                                            self->tx_buff.truesize);
 627
 628         self->stats.tx_bytes += self->tx_buff.len;
 629
 630         /* We are transmitting */
 631         self->transmitting = 1;
 632
 633         /* Turn on transmit finished interrupt. Will fire immediately!  */
 634         outb(UART_IER_THRI, iobase+UART_IER);
 635
 636         dev->trans_start = jiffies;
 637         spin_unlock_irqrestore(&self->lock, flags);
 638
 639         dev_kfree_skb(skb);
 640
 641         return 0;
 642 }
 643
 644 /*
 645  * Function irport_write (driver)
 646  *
 647  *    Fill Tx FIFO with transmit data
 648  *
 649  * Called only from irport_write_wakeup()
 650  */
 651 static inline int irport_write(int iobase, int fifo_size, __u8 *buf, int len)
 652 {
 653         int actual = 0;
 654
 655         /* Fill FIFO with current frame */
 656         while ((actual < fifo_size) && (actual < len)) {
 657                 /* Transmit next byte */
 658                 outb(buf[actual], iobase+UART_TX);
 659
 660                 actual++;
 661         }
 662
 663         return actual;
 664 }
 665
 666 /*
 667  * Function irport_write_wakeup (tty)
 668  *
 669  *    Called by the driver when there's room for more data.  If we have
 670  *    more packets to send, we send them here.
 671  *
 672  * Called only from irport_interrupt()
 673  * Make sure this function is *not* called while we are receiving,
 674  * otherwise we will reset fifo and loose data :-(
 675  */
 676 static inline void irport_write_wakeup(struct irport_cb *self)
 677 {
 678         int actual = 0;
 679         int iobase;
 680         unsigned int fcr;
 681
 682         IRDA_ASSERT(self != NULL, return;);
 683
 684         IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
 685
 686         iobase = self->io.sir_base;
 687
 688         /* Finished with frame?  */
 689         if (self->tx_buff.len > 0)  {
 690                 /* Write data left in transmit buffer */
 691                 actual = irport_write(iobase, self->io.fifo_size,
 692                                       self->tx_buff.data, self->tx_buff.len);
 693                 self->tx_buff.data += actual;
 694                 self->tx_buff.len  -= actual;
 695         } else {
 696                 /*
 697                  *  Now serial buffer is almost free & we can start
 698                  *  transmission of another packet. But first we must check
 699                  *  if we need to change the speed of the hardware
 700                  */
 701                 if (self->new_speed) {
 702                         irport_wait_hw_transmitter_finish(self);
 703                         irda_task_execute(self, __irport_change_speed,
 704                                           irport_change_speed_complete,
 705                                           NULL, (void *) self->new_speed);
 706                         self->new_speed = 0;
 707                 } else {
 708                         /* Tell network layer that we want more frames */
 709                         netif_wake_queue(self->netdev);
 710                 }
 711                 self->stats.tx_packets++;
 712
 713                 /*
 714                  * Reset Rx FIFO to make sure that all reflected transmit data
 715                  * is discarded. This is needed for half duplex operation
 716                  */
 717                 fcr = irport_get_fcr(self->io.speed);
 718                 fcr |= UART_FCR_CLEAR_RCVR;
 719                 outb(fcr, iobase+UART_FCR);
 720
 721                 /* Finished transmitting */
 722                 self->transmitting = 0;
 723
 724                 /* Turn on receive interrupts */
 725                 outb(UART_IER_RDI, iobase+UART_IER);
 726
 727                 IRDA_DEBUG(1, "%s() : finished Tx\n", __FUNCTION__);
 728         }
 729 }
 730
 731 /*
 732  * Function irport_receive (self)
 733  *
 734  *    Receive one frame from the infrared port
 735  *
 736  * Called only from irport_interrupt()
 737  */
 738 static inline void irport_receive(struct irport_cb *self)
 739 {
 740         int boguscount = 0;
 741         int iobase;
 742
 743         IRDA_ASSERT(self != NULL, return;);
 744
 745         iobase = self->io.sir_base;
 746
 747         /*
 748          * Receive all characters in Rx FIFO, unwrap and unstuff them.
 749          * async_unwrap_char will deliver all found frames
 750          */
 751         do {
 752                 async_unwrap_char(self->netdev, &self->stats, &self->rx_buff,
 753                                   inb(iobase+UART_RX));
 754
 755                 /* Make sure we don't stay here too long */
 756                 if (boguscount++ > 32) {
 757                         IRDA_DEBUG(2,"%s(), breaking!\n", __FUNCTION__);
 758                         break;
 759                 }
 760         } while (inb(iobase+UART_LSR) & UART_LSR_DR);
 761 }
 762
 763 /*
 764  * Function irport_interrupt (irq, dev_id, regs)
 765  *
 766  *    Interrupt handler
 767  */
 768 static irqreturn_t irport_interrupt(int irq, void *dev_id,
 769                                     struct pt_regs *regs)
 770 {
 771         struct net_device *dev = (struct net_device *) dev_id;
 772         struct irport_cb *self;
 773         int boguscount = 0;
 774         int iobase;
 775         int iir, lsr;
 776         int handled = 0;
 777
 778         if (!dev) {
 779                 IRDA_WARNING("%s() irq %d for unknown device.\n", __FUNCTION__, irq);
 780                 return IRQ_NONE;
 781         }
 782         self = (struct irport_cb *) dev->priv;
 783
 784         spin_lock(&self->lock);
 785
 786         iobase = self->io.sir_base;
 787
 788         /* Cut'n'paste interrupt routine from serial.c
 789          * This version try to minimise latency and I/O operations.
 790          * Simplified and modified to enforce half duplex operation.
 791          * - Jean II */
 792
 793         /* Check status even is iir reg is cleared, more robust and
 794          * eliminate a read on the I/O bus - Jean II */
 795         do {
 796                 /* Get interrupt status ; Clear interrupt */
 797                 lsr = inb(iobase+UART_LSR);
 798
 799                 /* Are we receiving or transmitting ? */
 800                 if(!self->transmitting) {
 801                         /* Received something ? */
 802                         if (lsr & UART_LSR_DR)
 803                                 irport_receive(self);
 804                 } else {
 805                         /* Room in Tx fifo ? */
 806                         if (lsr & (UART_LSR_THRE | UART_LSR_TEMT))
 807                                 irport_write_wakeup(self);
 808                 }
 809
 810                 /* A bit hackish, but working as expected... Jean II */
 811                 if(lsr & (UART_LSR_THRE | UART_LSR_TEMT | UART_LSR_DR))
 812                         handled = 1;
 813
 814                 /* Make sure we don't stay here to long */
 815                 if (boguscount++ > 10) {
 816                         IRDA_WARNING("%s() irq handler looping : lsr=%02x\n",
 817                                      __FUNCTION__, lsr);
 818                         break;
 819                 }
 820
 821                 /* Read interrupt register */
 822                 iir = inb(iobase+UART_IIR);
 823
 824                 /* Enable this debug only when no other options and at low
 825                  * bit rates, otherwise it may cause Rx overruns (lsr=63).
 826                  * - Jean II */
 827                 IRDA_DEBUG(6, "%s(), iir=%02x, lsr=%02x, iobase=%#x\n",
 828                             __FUNCTION__, iir, lsr, iobase);
 829
 830                 /* As long as interrupt pending... */
 831         } while ((iir & UART_IIR_NO_INT) == 0);
 832
 833         spin_unlock(&self->lock);
 834         return IRQ_RETVAL(handled);
 835 }
 836
 837 /*
 838  * Function irport_net_open (dev)
 839  *
 840  *    Network device is taken up. Usually this is done by "ifconfig irda0 up"
 841  *
 842  */
 843 static int irport_net_open(struct net_device *dev)
 844 {
 845         struct irport_cb *self;
 846         int iobase;
 847         char hwname[16];
 848         unsigned long flags;
 849
 850         IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
 851
 852         IRDA_ASSERT(dev != NULL, return -1;);
 853         self = (struct irport_cb *) dev->priv;
 854
 855         iobase = self->io.sir_base;
 856
 857         if (request_irq(self->io.irq, self->interrupt, 0, dev->name,
 858                         (void *) dev)) {
 859                 IRDA_DEBUG(0, "%s(), unable to allocate irq=%d\n",
 860                            __FUNCTION__, self->io.irq);
 861                 return -EAGAIN;
 862         }
 863
 864         spin_lock_irqsave(&self->lock, flags);
 865         /* Init uart */
 866         irport_start(self);
 867         /* Set 9600 bauds per default, including at the dongle */
 868         irda_task_execute(self, __irport_change_speed,
 869                           irport_change_speed_complete,
 870                           NULL, (void *) 9600);
 871         spin_unlock_irqrestore(&self->lock, flags);
 872
 873
 874         /* Give self a hardware name */
 875         sprintf(hwname, "SIR @ 0x%03x", self->io.sir_base);
 876
 877         /*
 878          * Open new IrLAP layer instance, now that everything should be
 879          * initialized properly
 880          */
 881         self->irlap = irlap_open(dev, &self->qos, hwname);
 882
 883         /* Ready to play! */
 884
 885         netif_start_queue(dev);
 886
 887         return 0;
 888 }
 889
 890 /*
 891  * Function irport_net_close (self)
 892  *
 893  *    Network device is taken down. Usually this is done by
 894  *    "ifconfig irda0 down"
 895  */
 896 static int irport_net_close(struct net_device *dev)
 897 {
 898         struct irport_cb *self;
 899         int iobase;
 900         unsigned long flags;
 901
 902         IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
 903
 904         IRDA_ASSERT(dev != NULL, return -1;);
 905         self = (struct irport_cb *) dev->priv;
 906
 907         IRDA_ASSERT(self != NULL, return -1;);
 908
 909         iobase = self->io.sir_base;
 910
 911         /* Stop device */
 912         netif_stop_queue(dev);
 913
 914         /* Stop and remove instance of IrLAP */
 915         if (self->irlap)
 916                 irlap_close(self->irlap);
 917         self->irlap = NULL;
 918
 919         spin_lock_irqsave(&self->lock, flags);
 920         irport_stop(self);
 921         spin_unlock_irqrestore(&self->lock, flags);
 922
 923         free_irq(self->io.irq, dev);
 924
 925         return 0;
 926 }
 927
 928 /*
 929  * Function irport_is_receiving (self)
 930  *
 931  *    Returns true is we are currently receiving data
 932  *
 933  */
 934 static inline int irport_is_receiving(struct irport_cb *self)
 935 {
 936         return (self->rx_buff.state != OUTSIDE_FRAME);
 937 }
 938
 939 /*
 940  * Function irport_set_dtr_rts (tty, dtr, rts)
 941  *
 942  *    This function can be used by dongles etc. to set or reset the status
 943  *    of the dtr and rts lines
 944  */
 945 static int irport_set_dtr_rts(struct net_device *dev, int dtr, int rts)
 946 {
 947         struct irport_cb *self = dev->priv;
 948         int iobase;
 949
 950         IRDA_ASSERT(self != NULL, return -1;);
 951
 952         iobase = self->io.sir_base;
 953
 954         if (dtr)
 955                 dtr = UART_MCR_DTR;
 956         if (rts)
 957                 rts = UART_MCR_RTS;
 958
 959         outb(dtr|rts|UART_MCR_OUT2, iobase+UART_MCR);
 960
 961         return 0;
 962 }
 963
 964 static int irport_raw_write(struct net_device *dev, __u8 *buf, int len)
 965 {
 966         struct irport_cb *self = (struct irport_cb *) dev->priv;
 967         int actual = 0;
 968         int iobase;
 969
 970         IRDA_ASSERT(self != NULL, return -1;);
 971
 972         iobase = self->io.sir_base;
 973
 974         /* Tx FIFO should be empty! */
 975         if (!(inb(iobase+UART_LSR) & UART_LSR_THRE)) {
 976                 IRDA_DEBUG( 0, "%s(), failed, fifo not empty!\n", __FUNCTION__);
 977                 return -1;
 978         }
 979
 980         /* Fill FIFO with current frame */
 981         while (actual < len) {
 982                 /* Transmit next byte */
 983                 outb(buf[actual], iobase+UART_TX);
 984                 actual++;
 985         }
 986
 987         return actual;
 988 }
 989
 990 /*
 991  * Function irport_net_ioctl (dev, rq, cmd)
 992  *
 993  *    Process IOCTL commands for this device
 994  *
 995  */
 996 static int irport_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
 997 {
 998         struct if_irda_req *irq = (struct if_irda_req *) rq;
 999         struct irport_cb *self;
1000         dongle_t *dongle;
1001         unsigned long flags;
1002         int ret = 0;
1003
1004         IRDA_ASSERT(dev != NULL, return -1;);
1005
1006         self = dev->priv;
1007
1008         IRDA_ASSERT(self != NULL, return -1;);
1009
1010         IRDA_DEBUG(2, "%s(), %s, (cmd=0x%X)\n", __FUNCTION__, dev->name, cmd);
1011
1012         switch (cmd) {
1013         case SIOCSBANDWIDTH: /* Set bandwidth */
1014                 if (!capable(CAP_NET_ADMIN))
1015                         ret = -EPERM;
1016                 else
1017                         irda_task_execute(self, __irport_change_speed, NULL,
1018                                           NULL, (void *) irq->ifr_baudrate);
1019                 break;
1020         case SIOCSDONGLE: /* Set dongle */
1021                 if (!capable(CAP_NET_ADMIN)) {
1022                         ret = -EPERM;
1023                         break;
1024                 }
1025
1026                 /* Locking :
1027                  * irda_device_dongle_init() can't be locked.
1028                  * irda_task_execute() doesn't need to be locked.
1029                  * Jean II
1030                  */
1031
1032                 /* Initialize dongle */
1033                 dongle = irda_device_dongle_init(dev, irq->ifr_dongle);
1034                 if (!dongle)
1035                         break;
1036
1037                 dongle->set_mode    = NULL;
1038                 dongle->read        = NULL;
1039                 dongle->write       = irport_raw_write;
1040                 dongle->set_dtr_rts = irport_set_dtr_rts;
1041
1042                 /* Now initialize the dongle!  */
1043                 dongle->issue->open(dongle, &self->qos);
1044
1045                 /* Reset dongle */
1046                 irda_task_execute(dongle, dongle->issue->reset, NULL, NULL,
1047                                   NULL);
1048
1049                 /* Make dongle available to driver only now to avoid
1050                  * race conditions - Jean II */
1051                 self->dongle = dongle;
1052                 break;
1053         case SIOCSMEDIABUSY: /* Set media busy */
1054                 if (!capable(CAP_NET_ADMIN)) {
1055                         ret = -EPERM;
1056                         break;
1057                 }
1058
1059                 irda_device_set_media_busy(self->netdev, TRUE);
1060                 break;
1061         case SIOCGRECEIVING: /* Check if we are receiving right now */
1062                 irq->ifr_receiving = irport_is_receiving(self);
1063                 break;
1064         case SIOCSDTRRTS:
1065                 if (!capable(CAP_NET_ADMIN)) {
1066                         ret = -EPERM;
1067                         break;
1068                 }
1069
1070                 /* No real need to lock... */
1071                 spin_lock_irqsave(&self->lock, flags);
1072                 irport_set_dtr_rts(dev, irq->ifr_dtr, irq->ifr_rts);
1073                 spin_unlock_irqrestore(&self->lock, flags);
1074                 break;
1075         default:
1076                 ret = -EOPNOTSUPP;
1077         }
1078
1079         return ret;
1080 }
1081
1082 static struct net_device_stats *irport_net_get_stats(struct net_device *dev)
1083 {
1084         struct irport_cb *self = (struct irport_cb *) dev->priv;
1085
1086         return &self->stats;
1087 }
1088
1089 static int __init irport_init(void)
1090 {
1091         int i;
1092
1093         for (i=0; (io[i] < 2000) && (i < ARRAY_SIZE(dev_self)); i++) {
1094                 if (irport_open(i, io[i], irq[i]) != NULL)
1095                         return 0;
1096         }
1097         /*
1098          * Maybe something failed, but we can still be usable for FIR drivers
1099          */
1100         return 0;
1101 }
1102
1103 /*
1104  * Function irport_cleanup ()
1105  *
1106  *    Close all configured ports
1107  *
1108  */
1109 static void __exit irport_cleanup(void)
1110 {
1111         int i;
1112
1113         IRDA_DEBUG( 4, "%s()\n", __FUNCTION__);
1114
1115         for (i=0; i < ARRAY_SIZE(dev_self); i++) {
1116                 if (dev_self[i])
1117                         irport_close(dev_self[i]);
1118         }
1119 }
1120
1121 module_param_array(io, int, NULL, 0);
1122 MODULE_PARM_DESC(io, "Base I/O addresses");
1123 module_param_array(irq, int, NULL, 0);
1124 MODULE_PARM_DESC(irq, "IRQ lines");
1125
1126 MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
1127 MODULE_DESCRIPTION("Half duplex serial driver for IrDA SIR mode");
1128 MODULE_LICENSE("GPL");
1129
1130 module_init(irport_init);
1131 module_exit(irport_cleanup);
1132