git.oblomov.eu Git - linux-2.6/blob - 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/config.h>
  22 #include <linux/module.h>
  23 #include <linux/moduleparam.h>
  24 #include <linux/types.h>
  25 #include <linux/init.h>
  26 #include <linux/errno.h>
  27 #include <linux/netdevice.h>
  28 #include <linux/slab.h>
  29 #include <linux/rtnetlink.h>
  30 #include <linux/interrupt.h>
  31 #include <linux/delay.h>
  32 #include <linux/platform_device.h>
  33 #include <linux/dma-mapping.h>
  34
  35 #include <net/irda/irda.h>
  36 #include <net/irda/wrapper.h>
  37 #include <net/irda/irda_device.h>
  38
  39 #include <asm/irq.h>
  40 #include <asm/dma.h>
  41 #include <asm/hardware.h>
  42 #include <asm/mach/irda.h>
  43
  44 static int power_level = 3;
  45 static int tx_lpm;
  46 static int max_rate = 4000000;
  47
  48 struct sa1100_irda {
  49         unsigned char           hscr0;
  50         unsigned char           utcr4;
  51         unsigned char           power;
  52         unsigned char           open;
  53
  54         int                     speed;
  55         int                     newspeed;
  56
  57         struct sk_buff          *txskb;
  58         struct sk_buff          *rxskb;
  59         dma_addr_t              txbuf_dma;
  60         dma_addr_t              rxbuf_dma;
  61         dma_regs_t              *txdma;
  62         dma_regs_t              *rxdma;
  63
  64         struct net_device_stats stats;
  65         struct device           *dev;
  66         struct irda_platform_data *pdata;
  67         struct irlap_cb         *irlap;
  68         struct qos_info         qos;
  69
  70         iobuff_t                tx_buff;
  71         iobuff_t                rx_buff;
  72 };
  73
  74 #define IS_FIR(si)              ((si)->speed >= 4000000)
  75
  76 #define HPSIR_MAX_RXLEN         2047
  77
  78 /*
  79  * Allocate and map the receive buffer, unless it is already allocated.
  80  */
  81 static int sa1100_irda_rx_alloc(struct sa1100_irda *si)
  82 {
  83         if (si->rxskb)
  84                 return 0;
  85
  86         si->rxskb = alloc_skb(HPSIR_MAX_RXLEN + 1, GFP_ATOMIC);
  87
  88         if (!si->rxskb) {
  89                 printk(KERN_ERR "sa1100_ir: out of memory for RX SKB\n");
  90                 return -ENOMEM;
  91         }
  92
  93         /*
  94          * Align any IP headers that may be contained
  95          * within the frame.
  96          */
  97         skb_reserve(si->rxskb, 1);
  98
  99         si->rxbuf_dma = dma_map_single(si->dev, si->rxskb->data,
 100                                         HPSIR_MAX_RXLEN,
 101                                         DMA_FROM_DEVICE);
 102         return 0;
 103 }
 104
 105 /*
 106  * We want to get here as soon as possible, and get the receiver setup.
 107  * We use the existing buffer.
 108  */
 109 static void sa1100_irda_rx_dma_start(struct sa1100_irda *si)
 110 {
 111         if (!si->rxskb) {
 112                 printk(KERN_ERR "sa1100_ir: rx buffer went missing\n");
 113                 return;
 114         }
 115
 116         /*
 117          * First empty receive FIFO
 118          */
 119         Ser2HSCR0 = si->hscr0 | HSCR0_HSSP;
 120
 121         /*
 122          * Enable the DMA, receiver and receive interrupt.
 123          */
 124         sa1100_clear_dma(si->rxdma);
 125         sa1100_start_dma(si->rxdma, si->rxbuf_dma, HPSIR_MAX_RXLEN);
 126         Ser2HSCR0 = si->hscr0 | HSCR0_HSSP | HSCR0_RXE;
 127 }
 128
 129 /*
 130  * Set the IrDA communications speed.
 131  */
 132 static int sa1100_irda_set_speed(struct sa1100_irda *si, int speed)
 133 {
 134         unsigned long flags;
 135         int brd, ret = -EINVAL;
 136
 137         switch (speed) {
 138         case 9600:      case 19200:     case 38400:
 139         case 57600:     case 115200:
 140                 brd = 3686400 / (16 * speed) - 1;
 141
 142                 /*
 143                  * Stop the receive DMA.
 144                  */
 145                 if (IS_FIR(si))
 146                         sa1100_stop_dma(si->rxdma);
 147
 148                 local_irq_save(flags);
 149
 150                 Ser2UTCR3 = 0;
 151                 Ser2HSCR0 = HSCR0_UART;
 152
 153                 Ser2UTCR1 = brd >> 8;
 154                 Ser2UTCR2 = brd;
 155
 156                 /*
 157                  * Clear status register
 158                  */
 159                 Ser2UTSR0 = UTSR0_REB | UTSR0_RBB | UTSR0_RID;
 160                 Ser2UTCR3 = UTCR3_RIE | UTCR3_RXE | UTCR3_TXE;
 161
 162                 if (si->pdata->set_speed)
 163                         si->pdata->set_speed(si->dev, speed);
 164
 165                 si->speed = speed;
 166
 167                 local_irq_restore(flags);
 168                 ret = 0;
 169                 break;
 170
 171         case 4000000:
 172                 local_irq_save(flags);
 173
 174                 si->hscr0 = 0;
 175
 176                 Ser2HSSR0 = 0xff;
 177                 Ser2HSCR0 = si->hscr0 | HSCR0_HSSP;
 178                 Ser2UTCR3 = 0;
 179
 180                 si->speed = speed;
 181
 182                 if (si->pdata->set_speed)
 183                         si->pdata->set_speed(si->dev, speed);
 184
 185                 sa1100_irda_rx_alloc(si);
 186                 sa1100_irda_rx_dma_start(si);
 187
 188                 local_irq_restore(flags);
 189
 190                 break;
 191
 192         default:
 193                 break;
 194         }
 195
 196         return ret;
 197 }
 198
 199 /*
 200  * Control the power state of the IrDA transmitter.
 201  * State:
 202  *  0 - off
 203  *  1 - short range, lowest power
 204  *  2 - medium range, medium power
 205  *  3 - maximum range, high power
 206  *
 207  * Currently, only assabet is known to support this.
 208  */
 209 static int
 210 __sa1100_irda_set_power(struct sa1100_irda *si, unsigned int state)
 211 {
 212         int ret = 0;
 213         if (si->pdata->set_power)
 214                 ret = si->pdata->set_power(si->dev, state);
 215         return ret;
 216 }
 217
 218 static inline int
 219 sa1100_set_power(struct sa1100_irda *si, unsigned int state)
 220 {
 221         int ret;
 222
 223         ret = __sa1100_irda_set_power(si, state);
 224         if (ret == 0)
 225                 si->power = state;
 226
 227         return ret;
 228 }
 229
 230 static int sa1100_irda_startup(struct sa1100_irda *si)
 231 {
 232         int ret;
 233
 234         /*
 235          * Ensure that the ports for this device are setup correctly.
 236          */
 237         if (si->pdata->startup)
 238                 si->pdata->startup(si->dev);
 239
 240         /*
 241          * Configure PPC for IRDA - we want to drive TXD2 low.
 242          * We also want to drive this pin low during sleep.
 243          */
 244         PPSR &= ~PPC_TXD2;
 245         PSDR &= ~PPC_TXD2;
 246         PPDR |= PPC_TXD2;
 247
 248         /*
 249          * Enable HP-SIR modulation, and ensure that the port is disabled.
 250          */
 251         Ser2UTCR3 = 0;
 252         Ser2HSCR0 = HSCR0_UART;
 253         Ser2UTCR4 = si->utcr4;
 254         Ser2UTCR0 = UTCR0_8BitData;
 255         Ser2HSCR2 = HSCR2_TrDataH | HSCR2_RcDataL;
 256
 257         /*
 258          * Clear status register
 259          */
 260         Ser2UTSR0 = UTSR0_REB | UTSR0_RBB | UTSR0_RID;
 261
 262         ret = sa1100_irda_set_speed(si, si->speed = 9600);
 263         if (ret) {
 264                 Ser2UTCR3 = 0;
 265                 Ser2HSCR0 = 0;
 266
 267                 if (si->pdata->shutdown)
 268                         si->pdata->shutdown(si->dev);
 269         }
 270
 271         return ret;
 272 }
 273
 274 static void sa1100_irda_shutdown(struct sa1100_irda *si)
 275 {
 276         /*
 277          * Stop all DMA activity.
 278          */
 279         sa1100_stop_dma(si->rxdma);
 280         sa1100_stop_dma(si->txdma);
 281
 282         /* Disable the port. */
 283         Ser2UTCR3 = 0;
 284         Ser2HSCR0 = 0;
 285
 286         if (si->pdata->shutdown)
 287                 si->pdata->shutdown(si->dev);
 288 }
 289
 290 #ifdef CONFIG_PM
 291 /*
 292  * Suspend the IrDA interface.
 293  */
 294 static int sa1100_irda_suspend(struct platform_device *pdev, pm_message_t state)
 295 {
 296         struct net_device *dev = platform_get_drvdata(pdev);
 297         struct sa1100_irda *si;
 298
 299         if (!dev)
 300                 return 0;
 301
 302         si = dev->priv;
 303         if (si->open) {
 304                 /*
 305                  * Stop the transmit queue
 306                  */
 307                 netif_device_detach(dev);
 308                 disable_irq(dev->irq);
 309                 sa1100_irda_shutdown(si);
 310                 __sa1100_irda_set_power(si, 0);
 311         }
 312
 313         return 0;
 314 }
 315
 316 /*
 317  * Resume the IrDA interface.
 318  */
 319 static int sa1100_irda_resume(struct platform_device *pdev)
 320 {
 321         struct net_device *dev = platform_get_drvdata(pdev);
 322         struct sa1100_irda *si;
 323
 324         if (!dev)
 325                 return 0;
 326
 327         si = dev->priv;
 328         if (si->open) {
 329                 /*
 330                  * If we missed a speed change, initialise at the new speed
 331                  * directly.  It is debatable whether this is actually
 332                  * required, but in the interests of continuing from where
 333                  * we left off it is desireable.  The converse argument is
 334                  * that we should re-negotiate at 9600 baud again.
 335                  */
 336                 if (si->newspeed) {
 337                         si->speed = si->newspeed;
 338                         si->newspeed = 0;
 339                 }
 340
 341                 sa1100_irda_startup(si);
 342                 __sa1100_irda_set_power(si, si->power);
 343                 enable_irq(dev->irq);
 344
 345                 /*
 346                  * This automatically wakes up the queue
 347                  */
 348                 netif_device_attach(dev);
 349         }
 350
 351         return 0;
 352 }
 353 #else
 354 #define sa1100_irda_suspend     NULL
 355 #define sa1100_irda_resume      NULL
 356 #endif
 357
 358 /*
 359  * HP-SIR format interrupt service routines.
 360  */
 361 static void sa1100_irda_hpsir_irq(struct net_device *dev)
 362 {
 363         struct sa1100_irda *si = dev->priv;
 364         int status;
 365
 366         status = Ser2UTSR0;
 367
 368         /*
 369          * Deal with any receive errors first.  The bytes in error may be
 370          * the only bytes in the receive FIFO, so we do this first.
 371          */
 372         while (status & UTSR0_EIF) {
 373                 int stat, data;
 374
 375                 stat = Ser2UTSR1;
 376                 data = Ser2UTDR;
 377
 378                 if (stat & (UTSR1_FRE | UTSR1_ROR)) {
 379                         si->stats.rx_errors++;
 380                         if (stat & UTSR1_FRE)
 381                                 si->stats.rx_frame_errors++;
 382                         if (stat & UTSR1_ROR)
 383                                 si->stats.rx_fifo_errors++;
 384                 } else
 385                         async_unwrap_char(dev, &si->stats, &si->rx_buff, data);
 386
 387                 status = Ser2UTSR0;
 388         }
 389
 390         /*
 391          * We must clear certain bits.
 392          */
 393         Ser2UTSR0 = status & (UTSR0_RID | UTSR0_RBB | UTSR0_REB);
 394
 395         if (status & UTSR0_RFS) {
 396                 /*
 397                  * There are at least 4 bytes in the FIFO.  Read 3 bytes
 398                  * and leave the rest to the block below.
 399                  */
 400                 async_unwrap_char(dev, &si->stats, &si->rx_buff, Ser2UTDR);
 401                 async_unwrap_char(dev, &si->stats, &si->rx_buff, Ser2UTDR);
 402                 async_unwrap_char(dev, &si->stats, &si->rx_buff, Ser2UTDR);
 403         }
 404
 405         if (status & (UTSR0_RFS | UTSR0_RID)) {
 406                 /*
 407                  * Fifo contains more than 1 character.
 408                  */
 409                 do {
 410                         async_unwrap_char(dev, &si->stats, &si->rx_buff,
 411                                           Ser2UTDR);
 412                 } while (Ser2UTSR1 & UTSR1_RNE);
 413
 414                 dev->last_rx = jiffies;
 415         }
 416
 417         if (status & UTSR0_TFS && si->tx_buff.len) {
 418                 /*
 419                  * Transmitter FIFO is not full
 420                  */
 421                 do {
 422                         Ser2UTDR = *si->tx_buff.data++;
 423                         si->tx_buff.len -= 1;
 424                 } while (Ser2UTSR1 & UTSR1_TNF && si->tx_buff.len);
 425
 426                 if (si->tx_buff.len == 0) {
 427                         si->stats.tx_packets++;
 428                         si->stats.tx_bytes += si->tx_buff.data -
 429                                               si->tx_buff.head;
 430
 431                         /*
 432                          * We need to ensure that the transmitter has
 433                          * finished.
 434                          */
 435                         do
 436                                 rmb();
 437                         while (Ser2UTSR1 & UTSR1_TBY);
 438
 439                         /*
 440                          * Ok, we've finished transmitting.  Now enable
 441                          * the receiver.  Sometimes we get a receive IRQ
 442                          * immediately after a transmit...
 443                          */
 444                         Ser2UTSR0 = UTSR0_REB | UTSR0_RBB | UTSR0_RID;
 445                         Ser2UTCR3 = UTCR3_RIE | UTCR3_RXE | UTCR3_TXE;
 446
 447                         if (si->newspeed) {
 448                                 sa1100_irda_set_speed(si, si->newspeed);
 449                                 si->newspeed = 0;
 450                         }
 451
 452                         /* I'm hungry! */
 453                         netif_wake_queue(dev);
 454                 }
 455         }
 456 }
 457
 458 static void sa1100_irda_fir_error(struct sa1100_irda *si, struct net_device *dev)
 459 {
 460         struct sk_buff *skb = si->rxskb;
 461         dma_addr_t dma_addr;
 462         unsigned int len, stat, data;
 463
 464         if (!skb) {
 465                 printk(KERN_ERR "sa1100_ir: SKB is NULL!\n");
 466                 return;
 467         }
 468
 469         /*
 470          * Get the current data position.
 471          */
 472         dma_addr = sa1100_get_dma_pos(si->rxdma);
 473         len = dma_addr - si->rxbuf_dma;
 474         if (len > HPSIR_MAX_RXLEN)
 475                 len = HPSIR_MAX_RXLEN;
 476         dma_unmap_single(si->dev, si->rxbuf_dma, len, DMA_FROM_DEVICE);
 477
 478         do {
 479                 /*
 480                  * Read Status, and then Data.
 481                  */
 482                 stat = Ser2HSSR1;
 483                 rmb();
 484                 data = Ser2HSDR;
 485
 486                 if (stat & (HSSR1_CRE | HSSR1_ROR)) {
 487                         si->stats.rx_errors++;
 488                         if (stat & HSSR1_CRE)
 489                                 si->stats.rx_crc_errors++;
 490                         if (stat & HSSR1_ROR)
 491                                 si->stats.rx_frame_errors++;
 492                 } else
 493                         skb->data[len++] = data;
 494
 495                 /*
 496                  * If we hit the end of frame, there's
 497                  * no point in continuing.
 498                  */
 499                 if (stat & HSSR1_EOF)
 500                         break;
 501         } while (Ser2HSSR0 & HSSR0_EIF);
 502
 503         if (stat & HSSR1_EOF) {
 504                 si->rxskb = NULL;
 505
 506                 skb_put(skb, len);
 507                 skb->dev = dev;
 508                 skb->mac.raw = skb->data;
 509                 skb->protocol = htons(ETH_P_IRDA);
 510                 si->stats.rx_packets++;
 511                 si->stats.rx_bytes += len;
 512
 513                 /*
 514                  * Before we pass the buffer up, allocate a new one.
 515                  */
 516                 sa1100_irda_rx_alloc(si);
 517
 518                 netif_rx(skb);
 519                 dev->last_rx = jiffies;
 520         } else {
 521                 /*
 522                  * Remap the buffer.
 523                  */
 524                 si->rxbuf_dma = dma_map_single(si->dev, si->rxskb->data,
 525                                                 HPSIR_MAX_RXLEN,
 526                                                 DMA_FROM_DEVICE);
 527         }
 528 }
 529
 530 /*
 531  * FIR format interrupt service routine.  We only have to
 532  * handle RX events; transmit events go via the TX DMA handler.
 533  *
 534  * No matter what, we disable RX, process, and the restart RX.
 535  */
 536 static void sa1100_irda_fir_irq(struct net_device *dev)
 537 {
 538         struct sa1100_irda *si = dev->priv;
 539
 540         /*
 541          * Stop RX DMA
 542          */
 543         sa1100_stop_dma(si->rxdma);
 544
 545         /*
 546          * Framing error - we throw away the packet completely.
 547          * Clearing RXE flushes the error conditions and data
 548          * from the fifo.
 549          */
 550         if (Ser2HSSR0 & (HSSR0_FRE | HSSR0_RAB)) {
 551                 si->stats.rx_errors++;
 552
 553                 if (Ser2HSSR0 & HSSR0_FRE)
 554                         si->stats.rx_frame_errors++;
 555
 556                 /*
 557                  * Clear out the DMA...
 558                  */
 559                 Ser2HSCR0 = si->hscr0 | HSCR0_HSSP;
 560
 561                 /*
 562                  * Clear selected status bits now, so we
 563                  * don't miss them next time around.
 564                  */
 565                 Ser2HSSR0 = HSSR0_FRE | HSSR0_RAB;
 566         }
 567
 568         /*
 569          * Deal with any receive errors.  The any of the lowest
 570          * 8 bytes in the FIFO may contain an error.  We must read
 571          * them one by one.  The "error" could even be the end of
 572          * packet!
 573          */
 574         if (Ser2HSSR0 & HSSR0_EIF)
 575                 sa1100_irda_fir_error(si, dev);
 576
 577         /*
 578          * No matter what happens, we must restart reception.
 579          */
 580         sa1100_irda_rx_dma_start(si);
 581 }
 582
 583 static irqreturn_t sa1100_irda_irq(int irq, void *dev_id, struct pt_regs *regs)
 584 {
 585         struct net_device *dev = dev_id;
 586         if (IS_FIR(((struct sa1100_irda *)dev->priv)))
 587                 sa1100_irda_fir_irq(dev);
 588         else
 589                 sa1100_irda_hpsir_irq(dev);
 590         return IRQ_HANDLED;
 591 }
 592
 593 /*
 594  * TX DMA completion handler.
 595  */
 596 static void sa1100_irda_txdma_irq(void *id)
 597 {
 598         struct net_device *dev = id;
 599         struct sa1100_irda *si = dev->priv;
 600         struct sk_buff *skb = si->txskb;
 601
 602         si->txskb = NULL;
 603
 604         /*
 605          * Wait for the transmission to complete.  Unfortunately,
 606          * the hardware doesn't give us an interrupt to indicate
 607          * "end of frame".
 608          */
 609         do
 610                 rmb();
 611         while (!(Ser2HSSR0 & HSSR0_TUR) || Ser2HSSR1 & HSSR1_TBY);
 612
 613         /*
 614          * Clear the transmit underrun bit.
 615          */
 616         Ser2HSSR0 = HSSR0_TUR;
 617
 618         /*
 619          * Do we need to change speed?  Note that we're lazy
 620          * here - we don't free the old rxskb.  We don't need
 621          * to allocate a buffer either.
 622          */
 623         if (si->newspeed) {
 624                 sa1100_irda_set_speed(si, si->newspeed);
 625                 si->newspeed = 0;
 626         }
 627
 628         /*
 629          * Start reception.  This disables the transmitter for
 630          * us.  This will be using the existing RX buffer.
 631          */
 632         sa1100_irda_rx_dma_start(si);
 633
 634         /*
 635          * Account and free the packet.
 636          */
 637         if (skb) {
 638                 dma_unmap_single(si->dev, si->txbuf_dma, skb->len, DMA_TO_DEVICE);
 639                 si->stats.tx_packets ++;
 640                 si->stats.tx_bytes += skb->len;
 641                 dev_kfree_skb_irq(skb);
 642         }
 643
 644         /*
 645          * Make sure that the TX queue is available for sending
 646          * (for retries).  TX has priority over RX at all times.
 647          */
 648         netif_wake_queue(dev);
 649 }
 650
 651 static int sa1100_irda_hard_xmit(struct sk_buff *skb, struct net_device *dev)
 652 {
 653         struct sa1100_irda *si = dev->priv;
 654         int speed = irda_get_next_speed(skb);
 655
 656         /*
 657          * Does this packet contain a request to change the interface
 658          * speed?  If so, remember it until we complete the transmission
 659          * of this frame.
 660          */
 661         if (speed != si->speed && speed != -1)
 662                 si->newspeed = speed;
 663
 664         /*
 665          * If this is an empty frame, we can bypass a lot.
 666          */
 667         if (skb->len == 0) {
 668                 if (si->newspeed) {
 669                         si->newspeed = 0;
 670                         sa1100_irda_set_speed(si, speed);
 671                 }
 672                 dev_kfree_skb(skb);
 673                 return 0;
 674         }
 675
 676         if (!IS_FIR(si)) {
 677                 netif_stop_queue(dev);
 678
 679                 si->tx_buff.data = si->tx_buff.head;
 680                 si->tx_buff.len  = async_wrap_skb(skb, si->tx_buff.data,
 681                                                   si->tx_buff.truesize);
 682
 683                 /*
 684                  * Set the transmit interrupt enable.  This will fire
 685                  * off an interrupt immediately.  Note that we disable
 686                  * the receiver so we won't get spurious characteres
 687                  * received.
 688                  */
 689                 Ser2UTCR3 = UTCR3_TIE | UTCR3_TXE;
 690
 691                 dev_kfree_skb(skb);
 692         } else {
 693                 int mtt = irda_get_mtt(skb);
 694
 695                 /*
 696                  * We must not be transmitting...
 697                  */
 698                 if (si->txskb)
 699                         BUG();
 700
 701                 netif_stop_queue(dev);
 702
 703                 si->txskb = skb;
 704                 si->txbuf_dma = dma_map_single(si->dev, skb->data,
 705                                          skb->len, DMA_TO_DEVICE);
 706
 707                 sa1100_start_dma(si->txdma, si->txbuf_dma, skb->len);
 708
 709                 /*
 710                  * If we have a mean turn-around time, impose the specified
 711                  * specified delay.  We could shorten this by timing from
 712                  * the point we received the packet.
 713                  */
 714                 if (mtt)
 715                         udelay(mtt);
 716
 717                 Ser2HSCR0 = si->hscr0 | HSCR0_HSSP | HSCR0_TXE;
 718         }
 719
 720         dev->trans_start = jiffies;
 721
 722         return 0;
 723 }
 724
 725 static int
 726 sa1100_irda_ioctl(struct net_device *dev, struct ifreq *ifreq, int cmd)
 727 {
 728         struct if_irda_req *rq = (struct if_irda_req *)ifreq;
 729         struct sa1100_irda *si = dev->priv;
 730         int ret = -EOPNOTSUPP;
 731
 732         switch (cmd) {
 733         case SIOCSBANDWIDTH:
 734                 if (capable(CAP_NET_ADMIN)) {
 735                         /*
 736                          * We are unable to set the speed if the
 737                          * device is not running.
 738                          */
 739                         if (si->open) {
 740                                 ret = sa1100_irda_set_speed(si,
 741                                                 rq->ifr_baudrate);
 742                         } else {
 743                                 printk("sa1100_irda_ioctl: SIOCSBANDWIDTH: !netif_running\n");
 744                                 ret = 0;
 745                         }
 746                 }
 747                 break;
 748
 749         case SIOCSMEDIABUSY:
 750                 ret = -EPERM;
 751                 if (capable(CAP_NET_ADMIN)) {
 752                         irda_device_set_media_busy(dev, TRUE);
 753                         ret = 0;
 754                 }
 755                 break;
 756
 757         case SIOCGRECEIVING:
 758                 rq->ifr_receiving = IS_FIR(si) ? 0
 759                                         : si->rx_buff.state != OUTSIDE_FRAME;
 760                 break;
 761
 762         default:
 763                 break;
 764         }
 765
 766         return ret;
 767 }
 768
 769 static struct net_device_stats *sa1100_irda_stats(struct net_device *dev)
 770 {
 771         struct sa1100_irda *si = dev->priv;
 772         return &si->stats;
 773 }
 774
 775 static int sa1100_irda_start(struct net_device *dev)
 776 {
 777         struct sa1100_irda *si = dev->priv;
 778         int err;
 779
 780         si->speed = 9600;
 781
 782         err = request_irq(dev->irq, sa1100_irda_irq, 0, dev->name, dev);
 783         if (err)
 784                 goto err_irq;
 785
 786         err = sa1100_request_dma(DMA_Ser2HSSPRd, "IrDA receive",
 787                                  NULL, NULL, &si->rxdma);
 788         if (err)
 789                 goto err_rx_dma;
 790
 791         err = sa1100_request_dma(DMA_Ser2HSSPWr, "IrDA transmit",
 792                                  sa1100_irda_txdma_irq, dev, &si->txdma);
 793         if (err)
 794                 goto err_tx_dma;
 795
 796         /*
 797          * The interrupt must remain disabled for now.
 798          */
 799         disable_irq(dev->irq);
 800
 801         /*
 802          * Setup the serial port for the specified speed.
 803          */
 804         err = sa1100_irda_startup(si);
 805         if (err)
 806                 goto err_startup;
 807
 808         /*
 809          * Open a new IrLAP layer instance.
 810          */
 811         si->irlap = irlap_open(dev, &si->qos, "sa1100");
 812         err = -ENOMEM;
 813         if (!si->irlap)
 814                 goto err_irlap;
 815
 816         /*
 817          * Now enable the interrupt and start the queue
 818          */
 819         si->open = 1;
 820         sa1100_set_power(si, power_level); /* low power mode */
 821         enable_irq(dev->irq);
 822         netif_start_queue(dev);
 823         return 0;
 824
 825 err_irlap:
 826         si->open = 0;
 827         sa1100_irda_shutdown(si);
 828 err_startup:
 829         sa1100_free_dma(si->txdma);
 830 err_tx_dma:
 831         sa1100_free_dma(si->rxdma);
 832 err_rx_dma:
 833         free_irq(dev->irq, dev);
 834 err_irq:
 835         return err;
 836 }
 837
 838 static int sa1100_irda_stop(struct net_device *dev)
 839 {
 840         struct sa1100_irda *si = dev->priv;
 841
 842         disable_irq(dev->irq);
 843         sa1100_irda_shutdown(si);
 844
 845         /*
 846          * If we have been doing DMA receive, make sure we
 847          * tidy that up cleanly.
 848          */
 849         if (si->rxskb) {
 850                 dma_unmap_single(si->dev, si->rxbuf_dma, HPSIR_MAX_RXLEN,
 851                                  DMA_FROM_DEVICE);
 852                 dev_kfree_skb(si->rxskb);
 853                 si->rxskb = NULL;
 854         }
 855
 856         /* Stop IrLAP */
 857         if (si->irlap) {
 858                 irlap_close(si->irlap);
 859                 si->irlap = NULL;
 860         }
 861
 862         netif_stop_queue(dev);
 863         si->open = 0;
 864
 865         /*
 866          * Free resources
 867          */
 868         sa1100_free_dma(si->txdma);
 869         sa1100_free_dma(si->rxdma);
 870         free_irq(dev->irq, dev);
 871
 872         sa1100_set_power(si, 0);
 873
 874         return 0;
 875 }
 876
 877 static int sa1100_irda_init_iobuf(iobuff_t *io, int size)
 878 {
 879         io->head = kmalloc(size, GFP_KERNEL | GFP_DMA);
 880         if (io->head != NULL) {
 881                 io->truesize = size;
 882                 io->in_frame = FALSE;
 883                 io->state    = OUTSIDE_FRAME;
 884                 io->data     = io->head;
 885         }
 886         return io->head ? 0 : -ENOMEM;
 887 }
 888
 889 static int sa1100_irda_probe(struct platform_device *pdev)
 890 {
 891         struct net_device *dev;
 892         struct sa1100_irda *si;
 893         unsigned int baudrate_mask;
 894         int err;
 895
 896         if (!pdev->dev.platform_data)
 897                 return -EINVAL;
 898
 899         err = request_mem_region(__PREG(Ser2UTCR0), 0x24, "IrDA") ? 0 : -EBUSY;
 900         if (err)
 901                 goto err_mem_1;
 902         err = request_mem_region(__PREG(Ser2HSCR0), 0x1c, "IrDA") ? 0 : -EBUSY;
 903         if (err)
 904                 goto err_mem_2;
 905         err = request_mem_region(__PREG(Ser2HSCR2), 0x04, "IrDA") ? 0 : -EBUSY;
 906         if (err)
 907                 goto err_mem_3;
 908
 909         dev = alloc_irdadev(sizeof(struct sa1100_irda));
 910         if (!dev)
 911                 goto err_mem_4;
 912
 913         si = dev->priv;
 914         si->dev = &pdev->dev;
 915         si->pdata = pdev->dev.platform_data;
 916
 917         /*
 918          * Initialise the HP-SIR buffers
 919          */
 920         err = sa1100_irda_init_iobuf(&si->rx_buff, 14384);
 921         if (err)
 922                 goto err_mem_5;
 923         err = sa1100_irda_init_iobuf(&si->tx_buff, 4000);
 924         if (err)
 925                 goto err_mem_5;
 926
 927         dev->hard_start_xmit    = sa1100_irda_hard_xmit;
 928         dev->open               = sa1100_irda_start;
 929         dev->stop               = sa1100_irda_stop;
 930         dev->do_ioctl           = sa1100_irda_ioctl;
 931         dev->get_stats          = sa1100_irda_stats;
 932         dev->irq                = IRQ_Ser2ICP;
 933
 934         irda_init_max_qos_capabilies(&si->qos);
 935
 936         /*
 937          * We support original IRDA up to 115k2. (we don't currently
 938          * support 4Mbps).  Min Turn Time set to 1ms or greater.
 939          */
 940         baudrate_mask = IR_9600;
 941
 942         switch (max_rate) {
 943         case 4000000:           baudrate_mask |= IR_4000000 << 8;
 944         case 115200:            baudrate_mask |= IR_115200;
 945         case 57600:             baudrate_mask |= IR_57600;
 946         case 38400:             baudrate_mask |= IR_38400;
 947         case 19200:             baudrate_mask |= IR_19200;
 948         }
 949
 950         si->qos.baud_rate.bits &= baudrate_mask;
 951         si->qos.min_turn_time.bits = 7;
 952
 953         irda_qos_bits_to_value(&si->qos);
 954
 955         si->utcr4 = UTCR4_HPSIR;
 956         if (tx_lpm)
 957                 si->utcr4 |= UTCR4_Z1_6us;
 958
 959         /*
 960          * Initially enable HP-SIR modulation, and ensure that the port
 961          * is disabled.
 962          */
 963         Ser2UTCR3 = 0;
 964         Ser2UTCR4 = si->utcr4;
 965         Ser2HSCR0 = HSCR0_UART;
 966
 967         err = register_netdev(dev);
 968         if (err == 0)
 969                 platform_set_drvdata(pdev, dev);
 970
 971         if (err) {
 972  err_mem_5:
 973                 kfree(si->tx_buff.head);
 974                 kfree(si->rx_buff.head);
 975                 free_netdev(dev);
 976  err_mem_4:
 977                 release_mem_region(__PREG(Ser2HSCR2), 0x04);
 978  err_mem_3:
 979                 release_mem_region(__PREG(Ser2HSCR0), 0x1c);
 980  err_mem_2:
 981                 release_mem_region(__PREG(Ser2UTCR0), 0x24);
 982         }
 983  err_mem_1:
 984         return err;
 985 }
 986
 987 static int sa1100_irda_remove(struct platform_device *pdev)
 988 {
 989         struct net_device *dev = platform_get_drvdata(pdev);
 990
 991         if (dev) {
 992                 struct sa1100_irda *si = dev->priv;
 993                 unregister_netdev(dev);
 994                 kfree(si->tx_buff.head);
 995                 kfree(si->rx_buff.head);
 996                 free_netdev(dev);
 997         }
 998
 999         release_mem_region(__PREG(Ser2HSCR2), 0x04);
1000         release_mem_region(__PREG(Ser2HSCR0), 0x1c);
1001         release_mem_region(__PREG(Ser2UTCR0), 0x24);
1002
1003         return 0;
1004 }
1005
1006 static struct platform_driver sa1100ir_driver = {
1007         .probe          = sa1100_irda_probe,
1008         .remove         = sa1100_irda_remove,
1009         .suspend        = sa1100_irda_suspend,
1010         .resume         = sa1100_irda_resume,
1011         .driver         = {
1012                 .name   = "sa11x0-ir",
1013         },
1014 };
1015
1016 static int __init sa1100_irda_init(void)
1017 {
1018         /*
1019          * Limit power level a sensible range.
1020          */
1021         if (power_level < 1)
1022                 power_level = 1;
1023         if (power_level > 3)
1024                 power_level = 3;
1025
1026         return platform_driver_register(&sa1100ir_driver);
1027 }
1028
1029 static void __exit sa1100_irda_exit(void)
1030 {
1031         platform_driver_unregister(&sa1100ir_driver);
1032 }
1033
1034 module_init(sa1100_irda_init);
1035 module_exit(sa1100_irda_exit);
1036 module_param(power_level, int, 0);
1037 module_param(tx_lpm, int, 0);
1038 module_param(max_rate, int, 0);
1039
1040 MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
1041 MODULE_DESCRIPTION("StrongARM SA1100 IrDA driver");
1042 MODULE_LICENSE("GPL");
1043 MODULE_PARM_DESC(power_level, "IrDA power level, 1 (low) to 3 (high)");
1044 MODULE_PARM_DESC(tx_lpm, "Enable transmitter low power (1.6us) mode");
1045 MODULE_PARM_DESC(max_rate, "Maximum baud rate (4000000, 115200, 57600, 38400, 19200, 9600)");