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