drivers/net/irda/sa1100_ir.c

   1 /*
   2  *  linux/drivers/net/irda/sa1100_ir.c
   3  *
   4  *  Copyright (C) 2000-2001 Russell King
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  *  Infra-red driver for the StrongARM SA1100 embedded microprocessor
  11  *
  12  *  Note that we don't have to worry about the SA1111's DMA bugs in here,
  13  *  so we use the straight forward dma_map_* functions with a null pointer.
  14  *
  15  *  This driver takes one kernel command line parameter, sa1100ir=, with
  16  *  the following options:
  17  *      max_rate:baudrate       - set the maximum baud rate
  18  *      power_leve:level        - set the transmitter power level
  19  *      tx_lpm:0|1              - set transmit low power mode
  20  */
  21 #include <linux/module.h>
  22 #include <linux/moduleparam.h>
  23 #include <linux/types.h>
  24 #include <linux/init.h>
  25 #include <linux/errno.h>
  26 #include <linux/netdevice.h>
  27 #include <linux/slab.h>
  28 #include <linux/rtnetlink.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/delay.h>
  31 #include <linux/platform_device.h>
  32 #include <linux/dma-mapping.h>
  33
  34 #include <net/irda/irda.h>
  35 #include <net/irda/wrapper.h>
  36 #include <net/irda/irda_device.h>
  37
  38 #include <asm/irq.h>
  39 #include <mach/dma.h>
  40 #include <mach/hardware.h>
  41 #include <asm/mach/irda.h>
  42
  43 static int power_level = 3;
  44 static int tx_lpm;
  45 static int max_rate = 4000000;
  46
  47 struct sa1100_irda {
  48         unsigned char           hscr0;
  49         unsigned char           utcr4;
  50         unsigned char           power;
  51         unsigned char           open;
  52
  53         int                     speed;
  54         int                     newspeed;
  55
  56         struct sk_buff          *txskb;
  57         struct sk_buff          *rxskb;
  58         dma_addr_t              txbuf_dma;
  59         dma_addr_t              rxbuf_dma;
  60         dma_regs_t              *txdma;
  61         dma_regs_t              *rxdma;
  62
  63         struct device           *dev;
  64         struct irda_platform_data *pdata;
  65         struct irlap_cb         *irlap;
  66         struct qos_info         qos;
  67
  68         iobuff_t                tx_buff;
  69         iobuff_t                rx_buff;
  70 };
  71
  72 #define IS_FIR(si)              ((si)->speed >= 4000000)
  73
  74 #define HPSIR_MAX_RXLEN         2047
  75
  76 /*
  77  * Allocate and map the receive buffer, unless it is already allocated.
  78  */
  79 static int sa1100_irda_rx_alloc(struct sa1100_irda *si)
  80 {
  81         if (si->rxskb)
  82                 return 0;
  83
  84         si->rxskb = alloc_skb(HPSIR_MAX_RXLEN + 1, GFP_ATOMIC);
  85
  86         if (!si->rxskb) {
  87                 printk(KERN_ERR "sa1100_ir: out of memory for RX SKB\n");
  88                 return -ENOMEM;
  89         }
  90
  91         /*
  92          * Align any IP headers that may be contained
  93          * within the frame.
  94          */
  95         skb_reserve(si->rxskb, 1);
  96
  97         si->rxbuf_dma = dma_map_single(si->dev, si->rxskb->data,
  98                                         HPSIR_MAX_RXLEN,
  99                                         DMA_FROM_DEVICE);
 100         return 0;
 101 }
 102
 103 /*
 104  * We want to get here as soon as possible, and get the receiver setup.
 105  * We use the existing buffer.
 106  */
 107 static void sa1100_irda_rx_dma_start(struct sa1100_irda *si)
 108 {
 109         if (!si->rxskb) {
 110                 printk(KERN_ERR "sa1100_ir: rx buffer went missing\n");
 111                 return;
 112         }
 113
 114         /*
 115          * First empty receive FIFO
 116          */
 117         Ser2HSCR0 = si->hscr0 | HSCR0_HSSP;
 118
 119         /*
 120          * Enable the DMA, receiver and receive interrupt.
 121          */
 122         sa1100_clear_dma(si->rxdma);
 123         sa1100_start_dma(si->rxdma, si->rxbuf_dma, HPSIR_MAX_RXLEN);
 124         Ser2HSCR0 = si->hscr0 | HSCR0_HSSP | HSCR0_RXE;
 125 }
 126
 127 /*
 128  * Set the IrDA communications speed.
 129  */
 130 static int sa1100_irda_set_speed(struct sa1100_irda *si, int speed)
 131 {
 132         unsigned long flags;
 133         int brd, ret = -EINVAL;
 134
 135         switch (speed) {
 136         case 9600:      case 19200:     case 38400:
 137         case 57600:     case 115200:
 138                 brd = 3686400 / (16 * speed) - 1;
 139
 140                 /*
 141                  * Stop the receive DMA.
 142                  */
 143                 if (IS_FIR(si))
 144                         sa1100_stop_dma(si->rxdma);
 145
 146                 local_irq_save(flags);
 147
 148                 Ser2UTCR3 = 0;
 149                 Ser2HSCR0 = HSCR0_UART;
 150
 151                 Ser2UTCR1 = brd >> 8;
 152                 Ser2UTCR2 = brd;
 153
 154                 /*
 155                  * Clear status register
 156                  */
 157                 Ser2UTSR0 = UTSR0_REB | UTSR0_RBB | UTSR0_RID;
 158                 Ser2UTCR3 = UTCR3_RIE | UTCR3_RXE | UTCR3_TXE;
 159
 160                 if (si->pdata->set_speed)
 161                         si->pdata->set_speed(si->dev, speed);
 162
 163                 si->speed = speed;
 164
 165                 local_irq_restore(flags);
 166                 ret = 0;
 167                 break;
 168
 169         case 4000000:
 170                 local_irq_save(flags);
 171
 172                 si->hscr0 = 0;
 173
 174                 Ser2HSSR0 = 0xff;
 175                 Ser2HSCR0 = si->hscr0 | HSCR0_HSSP;
 176                 Ser2UTCR3 = 0;
 177
 178                 si->speed = speed;
 179
 180                 if (si->pdata->set_speed)
 181                         si->pdata->set_speed(si->dev, speed);
 182
 183                 sa1100_irda_rx_alloc(si);
 184                 sa1100_irda_rx_dma_start(si);
 185
 186                 local_irq_restore(flags);
 187
 188                 break;
 189
 190         default:
 191                 break;
 192         }
 193
 194         return ret;
 195 }
 196
 197 /*
 198  * Control the power state of the IrDA transmitter.
 199  * State:
 200  *  0 - off
 201  *  1 - short range, lowest power
 202  *  2 - medium range, medium power
 203  *  3 - maximum range, high power
 204  *
 205  * Currently, only assabet is known to support this.
 206  */
 207 static int
 208 __sa1100_irda_set_power(struct sa1100_irda *si, unsigned int state)
 209 {
 210         int ret = 0;
 211         if (si->pdata->set_power)
 212                 ret = si->pdata->set_power(si->dev, state);
 213         return ret;
 214 }
 215
 216 static inline int
 217 sa1100_set_power(struct sa1100_irda *si, unsigned int state)
 218 {
 219         int ret;
 220
 221         ret = __sa1100_irda_set_power(si, state);
 222         if (ret == 0)
 223                 si->power = state;
 224
 225         return ret;
 226 }
 227
 228 static int sa1100_irda_startup(struct sa1100_irda *si)
 229 {
 230         int ret;
 231
 232         /*
 233          * Ensure that the ports for this device are setup correctly.
 234          */
 235         if (si->pdata->startup)
 236                 si->pdata->startup(si->dev);
 237
 238         /*
 239          * Configure PPC for IRDA - we want to drive TXD2 low.
 240          * We also want to drive this pin low during sleep.
 241          */
 242         PPSR &= ~PPC_TXD2;
 243         PSDR &= ~PPC_TXD2;
 244         PPDR |= PPC_TXD2;
 245
 246         /*
 247          * Enable HP-SIR modulation, and ensure that the port is disabled.
 248          */
 249         Ser2UTCR3 = 0;
 250         Ser2HSCR0 = HSCR0_UART;
 251         Ser2UTCR4 = si->utcr4;
 252         Ser2UTCR0 = UTCR0_8BitData;
 253         Ser2HSCR2 = HSCR2_TrDataH | HSCR2_RcDataL;
 254
 255         /*
 256          * Clear status register
 257          */
 258         Ser2UTSR0 = UTSR0_REB | UTSR0_RBB | UTSR0_RID;
 259
 260         ret = sa1100_irda_set_speed(si, si->speed = 9600);
 261         if (ret) {
 262                 Ser2UTCR3 = 0;
 263                 Ser2HSCR0 = 0;
 264
 265                 if (si->pdata->shutdown)
 266                         si->pdata->shutdown(si->dev);
 267         }
 268
 269         return ret;
 270 }
 271
 272 static void sa1100_irda_shutdown(struct sa1100_irda *si)
 273 {
 274         /*
 275          * Stop all DMA activity.
 276          */
 277         sa1100_stop_dma(si->rxdma);
 278         sa1100_stop_dma(si->txdma);
 279
 280         /* Disable the port. */
 281         Ser2UTCR3 = 0;
 282         Ser2HSCR0 = 0;
 283
 284         if (si->pdata->shutdown)
 285                 si->pdata->shutdown(si->dev);
 286 }
 287
 288 #ifdef CONFIG_PM
 289 /*
 290  * Suspend the IrDA interface.
 291  */
 292 static int sa1100_irda_suspend(struct platform_device *pdev, pm_message_t state)
 293 {
 294         struct net_device *dev = platform_get_drvdata(pdev);
 295         struct sa1100_irda *si;
 296
 297         if (!dev)
 298                 return 0;
 299
 300         si = netdev_priv(dev);
 301         if (si->open) {
 302                 /*
 303                  * Stop the transmit queue
 304                  */
 305                 netif_device_detach(dev);
 306                 disable_irq(dev->irq);
 307                 sa1100_irda_shutdown(si);
 308                 __sa1100_irda_set_power(si, 0);
 309         }
 310
 311         return 0;
 312 }
 313
 314 /*
 315  * Resume the IrDA interface.
 316  */
 317 static int sa1100_irda_resume(struct platform_device *pdev)
 318 {
 319         struct net_device *dev = platform_get_drvdata(pdev);
 320         struct sa1100_irda *si;
 321
 322         if (!dev)
 323                 return 0;
 324
 325         si = netdev_priv(dev);
 326         if (si->open) {
 327                 /*
 328                  * If we missed a speed change, initialise at the new speed
 329                  * directly.  It is debatable whether this is actually
 330                  * required, but in the interests of continuing from where
 331                  * we left off it is desireable.  The converse argument is
 332                  * that we should re-negotiate at 9600 baud again.
 333                  */
 334                 if (si->newspeed) {
 335                         si->speed = si->newspeed;
 336                         si->newspeed = 0;
 337                 }
 338
 339                 sa1100_irda_startup(si);
 340                 __sa1100_irda_set_power(si, si->power);
 341                 enable_irq(dev->irq);
 342
 343                 /*
 344                  * This automatically wakes up the queue
 345                  */
 346                 netif_device_attach(dev);
 347         }
 348
 349         return 0;
 350 }
 351 #else
 352 #define sa1100_irda_suspend     NULL
 353 #define sa1100_irda_resume      NULL
 354 #endif
 355
 356 /*
 357  * HP-SIR format interrupt service routines.
 358  */
 359 static void sa1100_irda_hpsir_irq(struct net_device *dev)
 360 {
 361         struct sa1100_irda *si = netdev_priv(dev);
 362         int status;
 363
 364         status = Ser2UTSR0;
 365
 366         /*
 367          * Deal with any receive errors first.  The bytes in error may be
 368          * the only bytes in the receive FIFO, so we do this first.
 369          */
 370         while (status & UTSR0_EIF) {
 371                 int stat, data;
 372
 373                 stat = Ser2UTSR1;
 374                 data = Ser2UTDR;
 375
 376                 if (stat & (UTSR1_FRE | UTSR1_ROR)) {
 377                         dev->stats.rx_errors++;
 378                         if (stat & UTSR1_FRE)
 379                                 dev->stats.rx_frame_errors++;
 380                         if (stat & UTSR1_ROR)
 381                                 dev->stats.rx_fifo_errors++;
 382                 } else
 383                         async_unwrap_char(dev, &dev->stats, &si->rx_buff, data);
 384
 385                 status = Ser2UTSR0;
 386         }
 387
 388         /*
 389          * We must clear certain bits.
 390          */
 391         Ser2UTSR0 = status & (UTSR0_RID | UTSR0_RBB | UTSR0_REB);
 392
 393         if (status & UTSR0_RFS) {
 394                 /*
 395                  * There are at least 4 bytes in the FIFO.  Read 3 bytes
 396                  * and leave the rest to the block below.
 397                  */
 398                 async_unwrap_char(dev, &dev->stats, &si->rx_buff, Ser2UTDR);
 399                 async_unwrap_char(dev, &dev->stats, &si->rx_buff, Ser2UTDR);
 400                 async_unwrap_char(dev, &dev->stats, &si->rx_buff, Ser2UTDR);
 401         }
 402
 403         if (status & (UTSR0_RFS | UTSR0_RID)) {
 404                 /*
 405                  * Fifo contains more than 1 character.
 406                  */
 407                 do {
 408                         async_unwrap_char(dev, &dev->stats, &si->rx_buff,
 409                                           Ser2UTDR);
 410                 } while (Ser2UTSR1 & UTSR1_RNE);
 411
 412         }
 413
 414         if (status & UTSR0_TFS && si->tx_buff.len) {
 415                 /*
 416                  * Transmitter FIFO is not full
 417                  */
 418                 do {
 419                         Ser2UTDR = *si->tx_buff.data++;
 420                         si->tx_buff.len -= 1;
 421                 } while (Ser2UTSR1 & UTSR1_TNF && si->tx_buff.len);
 422
 423                 if (si->tx_buff.len == 0) {
 424                         dev->stats.tx_packets++;
 425                         dev->stats.tx_bytes += si->tx_buff.data -
 426                                               si->tx_buff.head;
 427
 428                         /*
 429                          * We need to ensure that the transmitter has
 430                          * finished.
 431                          */
 432                         do
 433                                 rmb();
 434                         while (Ser2UTSR1 & UTSR1_TBY);
 435
 436                         /*
 437                          * Ok, we've finished transmitting.  Now enable
 438                          * the receiver.  Sometimes we get a receive IRQ
 439                          * immediately after a transmit...
 440                          */
 441                         Ser2UTSR0 = UTSR0_REB | UTSR0_RBB | UTSR0_RID;
 442                         Ser2UTCR3 = UTCR3_RIE | UTCR3_RXE | UTCR3_TXE;
 443
 444                         if (si->newspeed) {
 445                                 sa1100_irda_set_speed(si, si->newspeed);
 446                                 si->newspeed = 0;
 447                         }
 448
 449                         /* I'm hungry! */
 450                         netif_wake_queue(dev);
 451                 }
 452         }
 453 }
 454
 455 static void sa1100_irda_fir_error(struct sa1100_irda *si, struct net_device *dev)
 456 {
 457         struct sk_buff *skb = si->rxskb;
 458         dma_addr_t dma_addr;
 459         unsigned int len, stat, data;
 460
 461         if (!skb) {
 462                 printk(KERN_ERR "sa1100_ir: SKB is NULL!\n");
 463                 return;
 464         }
 465
 466         /*
 467          * Get the current data position.
 468          */
 469         dma_addr = sa1100_get_dma_pos(si->rxdma);
 470         len = dma_addr - si->rxbuf_dma;
 471         if (len > HPSIR_MAX_RXLEN)
 472                 len = HPSIR_MAX_RXLEN;
 473         dma_unmap_single(si->dev, si->rxbuf_dma, len, DMA_FROM_DEVICE);
 474
 475         do {
 476                 /*
 477                  * Read Status, and then Data.
 478                  */
 479                 stat = Ser2HSSR1;
 480                 rmb();
 481                 data = Ser2HSDR;
 482
 483                 if (stat & (HSSR1_CRE | HSSR1_ROR)) {
 484                         dev->stats.rx_errors++;
 485                         if (stat & HSSR1_CRE)
 486                                 dev->stats.rx_crc_errors++;
 487                         if (stat & HSSR1_ROR)
 488                                 dev->stats.rx_frame_errors++;
 489                 } else
 490                         skb->data[len++] = data;
 491
 492                 /*
 493                  * If we hit the end of frame, there's
 494                  * no point in continuing.
 495                  */
 496                 if (stat & HSSR1_EOF)
 497                         break;
 498         } while (Ser2HSSR0 & HSSR0_EIF);
 499
 500         if (stat & HSSR1_EOF) {
 501                 si->rxskb = NULL;
 502
 503                 skb_put(skb, len);
 504                 skb->dev = dev;
 505                 skb_reset_mac_header(skb);
 506                 skb->protocol = htons(ETH_P_IRDA);
 507                 dev->stats.rx_packets++;
 508                 dev->stats.rx_bytes += len;
 509
 510                 /*
 511                  * Before we pass the buffer up, allocate a new one.
 512                  */
 513                 sa1100_irda_rx_alloc(si);
 514
 515                 netif_rx(skb);
 516         } else {
 517                 /*
 518                  * Remap the buffer.
 519                  */
 520                 si->rxbuf_dma = dma_map_single(si->dev, si->rxskb->data,
 521                                                 HPSIR_MAX_RXLEN,
 522                                                 DMA_FROM_DEVICE);
 523         }
 524 }
 525
 526 /*
 527  * FIR format interrupt service routine.  We only have to
 528  * handle RX events; transmit events go via the TX DMA handler.
 529  *
 530  * No matter what, we disable RX, process, and the restart RX.
 531  */
 532 static void sa1100_irda_fir_irq(struct net_device *dev)
 533 {
 534         struct sa1100_irda *si = netdev_priv(dev);
 535
 536         /*
 537          * Stop RX DMA
 538          */
 539         sa1100_stop_dma(si->rxdma);
 540
 541         /*
 542          * Framing error - we throw away the packet completely.
 543          * Clearing RXE flushes the error conditions and data
 544          * from the fifo.
 545          */
 546         if (Ser2HSSR0 & (HSSR0_FRE | HSSR0_RAB)) {
 547                 dev->stats.rx_errors++;
 548
 549                 if (Ser2HSSR0 & HSSR0_FRE)
 550                         dev->stats.rx_frame_errors++;
 551
 552                 /*
 553                  * Clear out the DMA...
 554                  */
 555                 Ser2HSCR0 = si->hscr0 | HSCR0_HSSP;
 556
 557                 /*
 558                  * Clear selected status bits now, so we
 559                  * don't miss them next time around.
 560                  */
 561                 Ser2HSSR0 = HSSR0_FRE | HSSR0_RAB;
 562         }
 563
 564         /*
 565          * Deal with any receive errors.  The any of the lowest
 566          * 8 bytes in the FIFO may contain an error.  We must read
 567          * them one by one.  The "error" could even be the end of
 568          * packet!
 569          */
 570         if (Ser2HSSR0 & HSSR0_EIF)
 571                 sa1100_irda_fir_error(si, dev);
 572
 573         /*
 574          * No matter what happens, we must restart reception.
 575          */
 576         sa1100_irda_rx_dma_start(si);
 577 }
 578
 579 static irqreturn_t sa1100_irda_irq(int irq, void *dev_id)
 580 {
 581         struct net_device *dev = dev_id;
 582         if (IS_FIR(((struct sa1100_irda *)netdev_priv(dev))))
 583                 sa1100_irda_fir_irq(dev);
 584         else
 585                 sa1100_irda_hpsir_irq(dev);
 586         return IRQ_HANDLED;
 587 }
 588
 589 /*
 590  * TX DMA completion handler.
 591  */
 592 static void sa1100_irda_txdma_irq(void *id)
 593 {
 594         struct net_device *dev = id;
 595         struct sa1100_irda *si = netdev_priv(dev);
 596         struct sk_buff *skb = si->txskb;
 597
 598         si->txskb = NULL;
 599
 600         /*
 601          * Wait for the transmission to complete.  Unfortunately,
 602          * the hardware doesn't give us an interrupt to indicate
 603          * "end of frame".
 604          */
 605         do
 606                 rmb();
 607         while (!(Ser2HSSR0 & HSSR0_TUR) || Ser2HSSR1 & HSSR1_TBY);
 608
 609         /*
 610          * Clear the transmit underrun bit.
 611          */
 612         Ser2HSSR0 = HSSR0_TUR;
 613
 614         /*
 615          * Do we need to change speed?  Note that we're lazy
 616          * here - we don't free the old rxskb.  We don't need
 617          * to allocate a buffer either.
 618          */
 619         if (si->newspeed) {
 620                 sa1100_irda_set_speed(si, si->newspeed);
 621                 si->newspeed = 0;
 622         }
 623
 624         /*
 625          * Start reception.  This disables the transmitter for
 626          * us.  This will be using the existing RX buffer.
 627          */
 628         sa1100_irda_rx_dma_start(si);
 629
 630         /*
 631          * Account and free the packet.
 632          */
 633         if (skb) {
 634                 dma_unmap_single(si->dev, si->txbuf_dma, skb->len, DMA_TO_DEVICE);
 635                 dev->stats.tx_packets ++;
 636                 dev->stats.tx_bytes += skb->len;
 637                 dev_kfree_skb_irq(skb);
 638         }
 639
 640         /*
 641          * Make sure that the TX queue is available for sending
 642          * (for retries).  TX has priority over RX at all times.
 643          */
 644         netif_wake_queue(dev);
 645 }
 646
 647 static int sa1100_irda_hard_xmit(struct sk_buff *skb, struct net_device *dev)
 648 {
 649         struct sa1100_irda *si = netdev_priv(dev);
 650         int speed = irda_get_next_speed(skb);
 651
 652         /*
 653          * Does this packet contain a request to change the interface
 654          * speed?  If so, remember it until we complete the transmission
 655          * of this frame.
 656          */
 657         if (speed != si->speed && speed != -1)
 658                 si->newspeed = speed;
 659
 660         /*
 661          * If this is an empty frame, we can bypass a lot.
 662          */
 663         if (skb->len == 0) {
 664                 if (si->newspeed) {
 665                         si->newspeed = 0;
 666                         sa1100_irda_set_speed(si, speed);
 667                 }
 668                 dev_kfree_skb(skb);
 669                 return 0;
 670         }
 671
 672         if (!IS_FIR(si)) {
 673                 netif_stop_queue(dev);
 674
 675                 si->tx_buff.data = si->tx_buff.head;
 676                 si->tx_buff.len  = async_wrap_skb(skb, si->tx_buff.data,
 677                                                   si->tx_buff.truesize);
 678
 679                 /*
 680                  * Set the transmit interrupt enable.  This will fire
 681                  * off an interrupt immediately.  Note that we disable
 682                  * the receiver so we won't get spurious characteres
 683                  * received.
 684                  */
 685                 Ser2UTCR3 = UTCR3_TIE | UTCR3_TXE;
 686
 687                 dev_kfree_skb(skb);
 688         } else {
 689                 int mtt = irda_get_mtt(skb);
 690
 691                 /*
 692                  * We must not be transmitting...
 693                  */
 694                 BUG_ON(si->txskb);
 695
 696                 netif_stop_queue(dev);
 697
 698                 si->txskb = skb;
 699                 si->txbuf_dma = dma_map_single(si->dev, skb->data,
 700                                          skb->len, DMA_TO_DEVICE);
 701
 702                 sa1100_start_dma(si->txdma, si->txbuf_dma, skb->len);
 703
 704                 /*
 705                  * If we have a mean turn-around time, impose the specified
 706                  * specified delay.  We could shorten this by timing from
 707                  * the point we received the packet.
 708                  */
 709                 if (mtt)
 710                         udelay(mtt);
 711
 712                 Ser2HSCR0 = si->hscr0 | HSCR0_HSSP | HSCR0_TXE;
 713         }
 714
 715         dev->trans_start = jiffies;
 716
 717         return 0;
 718 }
 719
 720 static int
 721 sa1100_irda_ioctl(struct net_device *dev, struct ifreq *ifreq, int cmd)
 722 {
 723         struct if_irda_req *rq = (struct if_irda_req *)ifreq;
 724         struct sa1100_irda *si = netdev_priv(dev);
 725         int ret = -EOPNOTSUPP;
 726
 727         switch (cmd) {
 728         case SIOCSBANDWIDTH:
 729                 if (capable(CAP_NET_ADMIN)) {
 730                         /*
 731                          * We are unable to set the speed if the
 732                          * device is not running.
 733                          */
 734                         if (si->open) {
 735                                 ret = sa1100_irda_set_speed(si,
 736                                                 rq->ifr_baudrate);
 737                         } else {
 738                                 printk("sa1100_irda_ioctl: SIOCSBANDWIDTH: !netif_running\n");
 739                                 ret = 0;
 740                         }
 741                 }
 742                 break;
 743
 744         case SIOCSMEDIABUSY:
 745                 ret = -EPERM;
 746                 if (capable(CAP_NET_ADMIN)) {
 747                         irda_device_set_media_busy(dev, TRUE);
 748                         ret = 0;
 749                 }
 750                 break;
 751
 752         case SIOCGRECEIVING:
 753                 rq->ifr_receiving = IS_FIR(si) ? 0
 754                                         : si->rx_buff.state != OUTSIDE_FRAME;
 755                 break;
 756
 757         default:
 758                 break;
 759         }
 760
 761         return ret;
 762 }
 763
 764 static int sa1100_irda_start(struct net_device *dev)
 765 {
 766         struct sa1100_irda *si = netdev_priv(dev);
 767         int err;
 768
 769         si->speed = 9600;
 770
 771         err = request_irq(dev->irq, sa1100_irda_irq, 0, dev->name, dev);
 772         if (err)
 773                 goto err_irq;
 774
 775         err = sa1100_request_dma(DMA_Ser2HSSPRd, "IrDA receive",
 776                                  NULL, NULL, &si->rxdma);
 777         if (err)
 778                 goto err_rx_dma;
 779
 780         err = sa1100_request_dma(DMA_Ser2HSSPWr, "IrDA transmit",
 781                                  sa1100_irda_txdma_irq, dev, &si->txdma);
 782         if (err)
 783                 goto err_tx_dma;
 784
 785         /*
 786          * The interrupt must remain disabled for now.
 787          */
 788         disable_irq(dev->irq);
 789
 790         /*
 791          * Setup the serial port for the specified speed.
 792          */
 793         err = sa1100_irda_startup(si);
 794         if (err)
 795                 goto err_startup;
 796
 797         /*
 798          * Open a new IrLAP layer instance.
 799          */
 800         si->irlap = irlap_open(dev, &si->qos, "sa1100");
 801         err = -ENOMEM;
 802         if (!si->irlap)
 803                 goto err_irlap;
 804
 805         /*
 806          * Now enable the interrupt and start the queue
 807          */
 808         si->open = 1;
 809         sa1100_set_power(si, power_level); /* low power mode */
 810         enable_irq(dev->irq);
 811         netif_start_queue(dev);
 812         return 0;
 813
 814 err_irlap:
 815         si->open = 0;
 816         sa1100_irda_shutdown(si);
 817 err_startup:
 818         sa1100_free_dma(si->txdma);
 819 err_tx_dma:
 820         sa1100_free_dma(si->rxdma);
 821 err_rx_dma:
 822         free_irq(dev->irq, dev);
 823 err_irq:
 824         return err;
 825 }
 826
 827 static int sa1100_irda_stop(struct net_device *dev)
 828 {
 829         struct sa1100_irda *si = netdev_priv(dev);
 830
 831         disable_irq(dev->irq);
 832         sa1100_irda_shutdown(si);
 833
 834         /*
 835          * If we have been doing DMA receive, make sure we
 836          * tidy that up cleanly.
 837          */
 838         if (si->rxskb) {
 839                 dma_unmap_single(si->dev, si->rxbuf_dma, HPSIR_MAX_RXLEN,
 840                                  DMA_FROM_DEVICE);
 841                 dev_kfree_skb(si->rxskb);
 842                 si->rxskb = NULL;
 843         }
 844
 845         /* Stop IrLAP */
 846         if (si->irlap) {
 847                 irlap_close(si->irlap);
 848                 si->irlap = NULL;
 849         }
 850
 851         netif_stop_queue(dev);
 852         si->open = 0;
 853
 854         /*
 855          * Free resources
 856          */
 857         sa1100_free_dma(si->txdma);
 858         sa1100_free_dma(si->rxdma);
 859         free_irq(dev->irq, dev);
 860
 861         sa1100_set_power(si, 0);
 862
 863         return 0;
 864 }
 865
 866 static int sa1100_irda_init_iobuf(iobuff_t *io, int size)
 867 {
 868         io->head = kmalloc(size, GFP_KERNEL | GFP_DMA);
 869         if (io->head != NULL) {
 870                 io->truesize = size;
 871                 io->in_frame = FALSE;
 872                 io->state    = OUTSIDE_FRAME;
 873                 io->data     = io->head;
 874         }
 875         return io->head ? 0 : -ENOMEM;
 876 }
 877
 878 static const struct net_device_ops sa1100_irda_netdev_ops = {
 879         .ndo_open               = sa1100_irda_start,
 880         .ndo_stop               = sa1100_irda_stop,
 881         .ndo_start_xmit         = sa1100_irda_hard_xmit,
 882         .ndo_do_ioctl           = sa1100_irda_ioctl,
 883 };
 884
 885 static int sa1100_irda_probe(struct platform_device *pdev)
 886 {
 887         struct net_device *dev;
 888         struct sa1100_irda *si;
 889         unsigned int baudrate_mask;
 890         int err;
 891
 892         if (!pdev->dev.platform_data)
 893                 return -EINVAL;
 894
 895         err = request_mem_region(__PREG(Ser2UTCR0), 0x24, "IrDA") ? 0 : -EBUSY;
 896         if (err)
 897                 goto err_mem_1;
 898         err = request_mem_region(__PREG(Ser2HSCR0), 0x1c, "IrDA") ? 0 : -EBUSY;
 899         if (err)
 900                 goto err_mem_2;
 901         err = request_mem_region(__PREG(Ser2HSCR2), 0x04, "IrDA") ? 0 : -EBUSY;
 902         if (err)
 903                 goto err_mem_3;
 904
 905         dev = alloc_irdadev(sizeof(struct sa1100_irda));
 906         if (!dev)
 907                 goto err_mem_4;
 908
 909         si = netdev_priv(dev);
 910         si->dev = &pdev->dev;
 911         si->pdata = pdev->dev.platform_data;
 912
 913         /*
 914          * Initialise the HP-SIR buffers
 915          */
 916         err = sa1100_irda_init_iobuf(&si->rx_buff, 14384);
 917         if (err)
 918                 goto err_mem_5;
 919         err = sa1100_irda_init_iobuf(&si->tx_buff, 4000);
 920         if (err)
 921                 goto err_mem_5;
 922
 923         dev->netdev_ops = &sa1100_irda_netdev_ops;
 924         dev->irq        = IRQ_Ser2ICP;
 925
 926         irda_init_max_qos_capabilies(&si->qos);
 927
 928         /*
 929          * We support original IRDA up to 115k2. (we don't currently
 930          * support 4Mbps).  Min Turn Time set to 1ms or greater.
 931          */
 932         baudrate_mask = IR_9600;
 933
 934         switch (max_rate) {
 935         case 4000000:           baudrate_mask |= IR_4000000 << 8;
 936         case 115200:            baudrate_mask |= IR_115200;
 937         case 57600:             baudrate_mask |= IR_57600;
 938         case 38400:             baudrate_mask |= IR_38400;
 939         case 19200:             baudrate_mask |= IR_19200;
 940         }
 941
 942         si->qos.baud_rate.bits &= baudrate_mask;
 943         si->qos.min_turn_time.bits = 7;
 944
 945         irda_qos_bits_to_value(&si->qos);
 946
 947         si->utcr4 = UTCR4_HPSIR;
 948         if (tx_lpm)
 949                 si->utcr4 |= UTCR4_Z1_6us;
 950
 951         /*
 952          * Initially enable HP-SIR modulation, and ensure that the port
 953          * is disabled.
 954          */
 955         Ser2UTCR3 = 0;
 956         Ser2UTCR4 = si->utcr4;
 957         Ser2HSCR0 = HSCR0_UART;
 958
 959         err = register_netdev(dev);
 960         if (err == 0)
 961                 platform_set_drvdata(pdev, dev);
 962
 963         if (err) {
 964  err_mem_5:
 965                 kfree(si->tx_buff.head);
 966                 kfree(si->rx_buff.head);
 967                 free_netdev(dev);
 968  err_mem_4:
 969                 release_mem_region(__PREG(Ser2HSCR2), 0x04);
 970  err_mem_3:
 971                 release_mem_region(__PREG(Ser2HSCR0), 0x1c);
 972  err_mem_2:
 973                 release_mem_region(__PREG(Ser2UTCR0), 0x24);
 974         }
 975  err_mem_1:
 976         return err;
 977 }
 978
 979 static int sa1100_irda_remove(struct platform_device *pdev)
 980 {
 981         struct net_device *dev = platform_get_drvdata(pdev);
 982
 983         if (dev) {
 984                 struct sa1100_irda *si = netdev_priv(dev);
 985                 unregister_netdev(dev);
 986                 kfree(si->tx_buff.head);
 987                 kfree(si->rx_buff.head);
 988                 free_netdev(dev);
 989         }
 990
 991         release_mem_region(__PREG(Ser2HSCR2), 0x04);
 992         release_mem_region(__PREG(Ser2HSCR0), 0x1c);
 993         release_mem_region(__PREG(Ser2UTCR0), 0x24);
 994
 995         return 0;
 996 }
 997
 998 static struct platform_driver sa1100ir_driver = {
 999         .probe          = sa1100_irda_probe,
1000         .remove         = sa1100_irda_remove,
1001         .suspend        = sa1100_irda_suspend,
1002         .resume         = sa1100_irda_resume,
1003         .driver         = {
1004                 .name   = "sa11x0-ir",
1005                 .owner  = THIS_MODULE,
1006         },
1007 };
1008
1009 static int __init sa1100_irda_init(void)
1010 {
1011         /*
1012          * Limit power level a sensible range.
1013          */
1014         if (power_level < 1)
1015                 power_level = 1;
1016         if (power_level > 3)
1017                 power_level = 3;
1018
1019         return platform_driver_register(&sa1100ir_driver);
1020 }
1021
1022 static void __exit sa1100_irda_exit(void)
1023 {
1024         platform_driver_unregister(&sa1100ir_driver);
1025 }
1026
1027 module_init(sa1100_irda_init);
1028 module_exit(sa1100_irda_exit);
1029 module_param(power_level, int, 0);
1030 module_param(tx_lpm, int, 0);
1031 module_param(max_rate, int, 0);
1032
1033 MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
1034 MODULE_DESCRIPTION("StrongARM SA1100 IrDA driver");
1035 MODULE_LICENSE("GPL");
1036 MODULE_PARM_DESC(power_level, "IrDA power level, 1 (low) to 3 (high)");
1037 MODULE_PARM_DESC(tx_lpm, "Enable transmitter low power (1.6us) mode");
1038 MODULE_PARM_DESC(max_rate, "Maximum baud rate (4000000, 115200, 57600, 38400, 19200, 9600)");
1039 MODULE_ALIAS("platform:sa11x0-ir");