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/etherdevice.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 <mach/dma.h>
  41 #include <mach/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 device           *dev;
  65         struct irda_platform_data *pdata;
  66         struct irlap_cb         *irlap;
  67         struct qos_info         qos;
  68
  69         iobuff_t                tx_buff;
  70         iobuff_t                rx_buff;
  71 };
  72
  73 #define IS_FIR(si)              ((si)->speed >= 4000000)
  74
  75 #define HPSIR_MAX_RXLEN         2047
  76
  77 /*
  78  * Allocate and map the receive buffer, unless it is already allocated.
  79  */
  80 static int sa1100_irda_rx_alloc(struct sa1100_irda *si)
  81 {
  82         if (si->rxskb)
  83                 return 0;
  84
  85         si->rxskb = alloc_skb(HPSIR_MAX_RXLEN + 1, GFP_ATOMIC);
  86
  87         if (!si->rxskb) {
  88                 printk(KERN_ERR "sa1100_ir: out of memory for RX SKB\n");
  89                 return -ENOMEM;
  90         }
  91
  92         /*
  93          * Align any IP headers that may be contained
  94          * within the frame.
  95          */
  96         skb_reserve(si->rxskb, 1);
  97
  98         si->rxbuf_dma = dma_map_single(si->dev, si->rxskb->data,
  99                                         HPSIR_MAX_RXLEN,
 100                                         DMA_FROM_DEVICE);
 101         return 0;
 102 }
 103
 104 /*
 105  * We want to get here as soon as possible, and get the receiver setup.
 106  * We use the existing buffer.
 107  */
 108 static void sa1100_irda_rx_dma_start(struct sa1100_irda *si)
 109 {
 110         if (!si->rxskb) {
 111                 printk(KERN_ERR "sa1100_ir: rx buffer went missing\n");
 112                 return;
 113         }
 114
 115         /*
 116          * First empty receive FIFO
 117          */
 118         Ser2HSCR0 = si->hscr0 | HSCR0_HSSP;
 119
 120         /*
 121          * Enable the DMA, receiver and receive interrupt.
 122          */
 123         sa1100_clear_dma(si->rxdma);
 124         sa1100_start_dma(si->rxdma, si->rxbuf_dma, HPSIR_MAX_RXLEN);
 125         Ser2HSCR0 = si->hscr0 | HSCR0_HSSP | HSCR0_RXE;
 126 }
 127
 128 /*
 129  * Set the IrDA communications speed.
 130  */
 131 static int sa1100_irda_set_speed(struct sa1100_irda *si, int speed)
 132 {
 133         unsigned long flags;
 134         int brd, ret = -EINVAL;
 135
 136         switch (speed) {
 137         case 9600:      case 19200:     case 38400:
 138         case 57600:     case 115200:
 139                 brd = 3686400 / (16 * speed) - 1;
 140
 141                 /*
 142                  * Stop the receive DMA.
 143                  */
 144                 if (IS_FIR(si))
 145                         sa1100_stop_dma(si->rxdma);
 146
 147                 local_irq_save(flags);
 148
 149                 Ser2UTCR3 = 0;
 150                 Ser2HSCR0 = HSCR0_UART;
 151
 152                 Ser2UTCR1 = brd >> 8;
 153                 Ser2UTCR2 = brd;
 154
 155                 /*
 156                  * Clear status register
 157                  */
 158                 Ser2UTSR0 = UTSR0_REB | UTSR0_RBB | UTSR0_RID;
 159                 Ser2UTCR3 = UTCR3_RIE | UTCR3_RXE | UTCR3_TXE;
 160
 161                 if (si->pdata->set_speed)
 162                         si->pdata->set_speed(si->dev, speed);
 163
 164                 si->speed = speed;
 165
 166                 local_irq_restore(flags);
 167                 ret = 0;
 168                 break;
 169
 170         case 4000000:
 171                 local_irq_save(flags);
 172
 173                 si->hscr0 = 0;
 174
 175                 Ser2HSSR0 = 0xff;
 176                 Ser2HSCR0 = si->hscr0 | HSCR0_HSSP;
 177                 Ser2UTCR3 = 0;
 178
 179                 si->speed = speed;
 180
 181                 if (si->pdata->set_speed)
 182                         si->pdata->set_speed(si->dev, speed);
 183
 184                 sa1100_irda_rx_alloc(si);
 185                 sa1100_irda_rx_dma_start(si);
 186
 187                 local_irq_restore(flags);
 188
 189                 break;
 190
 191         default:
 192                 break;
 193         }
 194
 195         return ret;
 196 }
 197
 198 /*
 199  * Control the power state of the IrDA transmitter.
 200  * State:
 201  *  0 - off
 202  *  1 - short range, lowest power
 203  *  2 - medium range, medium power
 204  *  3 - maximum range, high power
 205  *
 206  * Currently, only assabet is known to support this.
 207  */
 208 static int
 209 __sa1100_irda_set_power(struct sa1100_irda *si, unsigned int state)
 210 {
 211         int ret = 0;
 212         if (si->pdata->set_power)
 213                 ret = si->pdata->set_power(si->dev, state);
 214         return ret;
 215 }
 216
 217 static inline int
 218 sa1100_set_power(struct sa1100_irda *si, unsigned int state)
 219 {
 220         int ret;
 221
 222         ret = __sa1100_irda_set_power(si, state);
 223         if (ret == 0)
 224                 si->power = state;
 225
 226         return ret;
 227 }
 228
 229 static int sa1100_irda_startup(struct sa1100_irda *si)
 230 {
 231         int ret;
 232
 233         /*
 234          * Ensure that the ports for this device are setup correctly.
 235          */
 236         if (si->pdata->startup)
 237                 si->pdata->startup(si->dev);
 238
 239         /*
 240          * Configure PPC for IRDA - we want to drive TXD2 low.
 241          * We also want to drive this pin low during sleep.
 242          */
 243         PPSR &= ~PPC_TXD2;
 244         PSDR &= ~PPC_TXD2;
 245         PPDR |= PPC_TXD2;
 246
 247         /*
 248          * Enable HP-SIR modulation, and ensure that the port is disabled.
 249          */
 250         Ser2UTCR3 = 0;
 251         Ser2HSCR0 = HSCR0_UART;
 252         Ser2UTCR4 = si->utcr4;
 253         Ser2UTCR0 = UTCR0_8BitData;
 254         Ser2HSCR2 = HSCR2_TrDataH | HSCR2_RcDataL;
 255
 256         /*
 257          * Clear status register
 258          */
 259         Ser2UTSR0 = UTSR0_REB | UTSR0_RBB | UTSR0_RID;
 260
 261         ret = sa1100_irda_set_speed(si, si->speed = 9600);
 262         if (ret) {
 263                 Ser2UTCR3 = 0;
 264                 Ser2HSCR0 = 0;
 265
 266                 if (si->pdata->shutdown)
 267                         si->pdata->shutdown(si->dev);
 268         }
 269
 270         return ret;
 271 }
 272
 273 static void sa1100_irda_shutdown(struct sa1100_irda *si)
 274 {
 275         /*
 276          * Stop all DMA activity.
 277          */
 278         sa1100_stop_dma(si->rxdma);
 279         sa1100_stop_dma(si->txdma);
 280
 281         /* Disable the port. */
 282         Ser2UTCR3 = 0;
 283         Ser2HSCR0 = 0;
 284
 285         if (si->pdata->shutdown)
 286                 si->pdata->shutdown(si->dev);
 287 }
 288
 289 #ifdef CONFIG_PM
 290 /*
 291  * Suspend the IrDA interface.
 292  */
 293 static int sa1100_irda_suspend(struct platform_device *pdev, pm_message_t state)
 294 {
 295         struct net_device *dev = platform_get_drvdata(pdev);
 296         struct sa1100_irda *si;
 297
 298         if (!dev)
 299                 return 0;
 300
 301         si = netdev_priv(dev);
 302         if (si->open) {
 303                 /*
 304                  * Stop the transmit queue
 305                  */
 306                 netif_device_detach(dev);
 307                 disable_irq(dev->irq);
 308                 sa1100_irda_shutdown(si);
 309                 __sa1100_irda_set_power(si, 0);
 310         }
 311
 312         return 0;
 313 }
 314
 315 /*
 316  * Resume the IrDA interface.
 317  */
 318 static int sa1100_irda_resume(struct platform_device *pdev)
 319 {
 320         struct net_device *dev = platform_get_drvdata(pdev);
 321         struct sa1100_irda *si;
 322
 323         if (!dev)
 324                 return 0;
 325
 326         si = netdev_priv(dev);
 327         if (si->open) {
 328                 /*
 329                  * If we missed a speed change, initialise at the new speed
 330                  * directly.  It is debatable whether this is actually
 331                  * required, but in the interests of continuing from where
 332                  * we left off it is desireable.  The converse argument is
 333                  * that we should re-negotiate at 9600 baud again.
 334                  */
 335                 if (si->newspeed) {
 336                         si->speed = si->newspeed;
 337                         si->newspeed = 0;
 338                 }
 339
 340                 sa1100_irda_startup(si);
 341                 __sa1100_irda_set_power(si, si->power);
 342                 enable_irq(dev->irq);
 343
 344                 /*
 345                  * This automatically wakes up the queue
 346                  */
 347                 netif_device_attach(dev);
 348         }
 349
 350         return 0;
 351 }
 352 #else
 353 #define sa1100_irda_suspend     NULL
 354 #define sa1100_irda_resume      NULL
 355 #endif
 356
 357 /*
 358  * HP-SIR format interrupt service routines.
 359  */
 360 static void sa1100_irda_hpsir_irq(struct net_device *dev)
 361 {
 362         struct sa1100_irda *si = netdev_priv(dev);
 363         int status;
 364
 365         status = Ser2UTSR0;
 366
 367         /*
 368          * Deal with any receive errors first.  The bytes in error may be
 369          * the only bytes in the receive FIFO, so we do this first.
 370          */
 371         while (status & UTSR0_EIF) {
 372                 int stat, data;
 373
 374                 stat = Ser2UTSR1;
 375                 data = Ser2UTDR;
 376
 377                 if (stat & (UTSR1_FRE | UTSR1_ROR)) {
 378                         dev->stats.rx_errors++;
 379                         if (stat & UTSR1_FRE)
 380                                 dev->stats.rx_frame_errors++;
 381                         if (stat & UTSR1_ROR)
 382                                 dev->stats.rx_fifo_errors++;
 383                 } else
 384                         async_unwrap_char(dev, &dev->stats, &si->rx_buff, data);
 385
 386                 status = Ser2UTSR0;
 387         }
 388
 389         /*
 390          * We must clear certain bits.
 391          */
 392         Ser2UTSR0 = status & (UTSR0_RID | UTSR0_RBB | UTSR0_REB);
 393
 394         if (status & UTSR0_RFS) {
 395                 /*
 396                  * There are at least 4 bytes in the FIFO.  Read 3 bytes
 397                  * and leave the rest to the block below.
 398                  */
 399                 async_unwrap_char(dev, &dev->stats, &si->rx_buff, Ser2UTDR);
 400                 async_unwrap_char(dev, &dev->stats, &si->rx_buff, Ser2UTDR);
 401                 async_unwrap_char(dev, &dev->stats, &si->rx_buff, Ser2UTDR);
 402         }
 403
 404         if (status & (UTSR0_RFS | UTSR0_RID)) {
 405                 /*
 406                  * Fifo contains more than 1 character.
 407                  */
 408                 do {
 409                         async_unwrap_char(dev, &dev->stats, &si->rx_buff,
 410                                           Ser2UTDR);
 411                 } while (Ser2UTSR1 & UTSR1_RNE);
 412
 413         }
 414
 415         if (status & UTSR0_TFS && si->tx_buff.len) {
 416                 /*
 417                  * Transmitter FIFO is not full
 418                  */
 419                 do {
 420                         Ser2UTDR = *si->tx_buff.data++;
 421                         si->tx_buff.len -= 1;
 422                 } while (Ser2UTSR1 & UTSR1_TNF && si->tx_buff.len);
 423
 424                 if (si->tx_buff.len == 0) {
 425                         dev->stats.tx_packets++;
 426                         dev->stats.tx_bytes += si->tx_buff.data -
 427                                               si->tx_buff.head;
 428
 429                         /*
 430                          * We need to ensure that the transmitter has
 431                          * finished.
 432                          */
 433                         do
 434                                 rmb();
 435                         while (Ser2UTSR1 & UTSR1_TBY);
 436
 437                         /*
 438                          * Ok, we've finished transmitting.  Now enable
 439                          * the receiver.  Sometimes we get a receive IRQ
 440                          * immediately after a transmit...
 441                          */
 442                         Ser2UTSR0 = UTSR0_REB | UTSR0_RBB | UTSR0_RID;
 443                         Ser2UTCR3 = UTCR3_RIE | UTCR3_RXE | UTCR3_TXE;
 444
 445                         if (si->newspeed) {
 446                                 sa1100_irda_set_speed(si, si->newspeed);
 447                                 si->newspeed = 0;
 448                         }
 449
 450                         /* I'm hungry! */
 451                         netif_wake_queue(dev);
 452                 }
 453         }
 454 }
 455
 456 static void sa1100_irda_fir_error(struct sa1100_irda *si, struct net_device *dev)
 457 {
 458         struct sk_buff *skb = si->rxskb;
 459         dma_addr_t dma_addr;
 460         unsigned int len, stat, data;
 461
 462         if (!skb) {
 463                 printk(KERN_ERR "sa1100_ir: SKB is NULL!\n");
 464                 return;
 465         }
 466
 467         /*
 468          * Get the current data position.
 469          */
 470         dma_addr = sa1100_get_dma_pos(si->rxdma);
 471         len = dma_addr - si->rxbuf_dma;
 472         if (len > HPSIR_MAX_RXLEN)
 473                 len = HPSIR_MAX_RXLEN;
 474         dma_unmap_single(si->dev, si->rxbuf_dma, len, DMA_FROM_DEVICE);
 475
 476         do {
 477                 /*
 478                  * Read Status, and then Data.
 479                  */
 480                 stat = Ser2HSSR1;
 481                 rmb();
 482                 data = Ser2HSDR;
 483
 484                 if (stat & (HSSR1_CRE | HSSR1_ROR)) {
 485                         dev->stats.rx_errors++;
 486                         if (stat & HSSR1_CRE)
 487                                 dev->stats.rx_crc_errors++;
 488                         if (stat & HSSR1_ROR)
 489                                 dev->stats.rx_frame_errors++;
 490                 } else
 491                         skb->data[len++] = data;
 492
 493                 /*
 494                  * If we hit the end of frame, there's
 495                  * no point in continuing.
 496                  */
 497                 if (stat & HSSR1_EOF)
 498                         break;
 499         } while (Ser2HSSR0 & HSSR0_EIF);
 500
 501         if (stat & HSSR1_EOF) {
 502                 si->rxskb = NULL;
 503
 504                 skb_put(skb, len);
 505                 skb->dev = dev;
 506                 skb_reset_mac_header(skb);
 507                 skb->protocol = htons(ETH_P_IRDA);
 508                 dev->stats.rx_packets++;
 509                 dev->stats.rx_bytes += len;
 510
 511                 /*
 512                  * Before we pass the buffer up, allocate a new one.
 513                  */
 514                 sa1100_irda_rx_alloc(si);
 515
 516                 netif_rx(skb);
 517         } else {
 518                 /*
 519                  * Remap the buffer.
 520                  */
 521                 si->rxbuf_dma = dma_map_single(si->dev, si->rxskb->data,
 522                                                 HPSIR_MAX_RXLEN,
 523                                                 DMA_FROM_DEVICE);
 524         }
 525 }
 526
 527 /*
 528  * FIR format interrupt service routine.  We only have to
 529  * handle RX events; transmit events go via the TX DMA handler.
 530  *
 531  * No matter what, we disable RX, process, and the restart RX.
 532  */
 533 static void sa1100_irda_fir_irq(struct net_device *dev)
 534 {
 535         struct sa1100_irda *si = netdev_priv(dev);
 536
 537         /*
 538          * Stop RX DMA
 539          */
 540         sa1100_stop_dma(si->rxdma);
 541
 542         /*
 543          * Framing error - we throw away the packet completely.
 544          * Clearing RXE flushes the error conditions and data
 545          * from the fifo.
 546          */
 547         if (Ser2HSSR0 & (HSSR0_FRE | HSSR0_RAB)) {
 548                 dev->stats.rx_errors++;
 549
 550                 if (Ser2HSSR0 & HSSR0_FRE)
 551                         dev->stats.rx_frame_errors++;
 552
 553                 /*
 554                  * Clear out the DMA...
 555                  */
 556                 Ser2HSCR0 = si->hscr0 | HSCR0_HSSP;
 557
 558                 /*
 559                  * Clear selected status bits now, so we
 560                  * don't miss them next time around.
 561                  */
 562                 Ser2HSSR0 = HSSR0_FRE | HSSR0_RAB;
 563         }
 564
 565         /*
 566          * Deal with any receive errors.  The any of the lowest
 567          * 8 bytes in the FIFO may contain an error.  We must read
 568          * them one by one.  The "error" could even be the end of
 569          * packet!
 570          */
 571         if (Ser2HSSR0 & HSSR0_EIF)
 572                 sa1100_irda_fir_error(si, dev);
 573
 574         /*
 575          * No matter what happens, we must restart reception.
 576          */
 577         sa1100_irda_rx_dma_start(si);
 578 }
 579
 580 static irqreturn_t sa1100_irda_irq(int irq, void *dev_id)
 581 {
 582         struct net_device *dev = dev_id;
 583         if (IS_FIR(((struct sa1100_irda *)netdev_priv(dev))))
 584                 sa1100_irda_fir_irq(dev);
 585         else
 586                 sa1100_irda_hpsir_irq(dev);
 587         return IRQ_HANDLED;
 588 }
 589
 590 /*
 591  * TX DMA completion handler.
 592  */
 593 static void sa1100_irda_txdma_irq(void *id)
 594 {
 595         struct net_device *dev = id;
 596         struct sa1100_irda *si = netdev_priv(dev);
 597         struct sk_buff *skb = si->txskb;
 598
 599         si->txskb = NULL;
 600
 601         /*
 602          * Wait for the transmission to complete.  Unfortunately,
 603          * the hardware doesn't give us an interrupt to indicate
 604          * "end of frame".
 605          */
 606         do
 607                 rmb();
 608         while (!(Ser2HSSR0 & HSSR0_TUR) || Ser2HSSR1 & HSSR1_TBY);
 609
 610         /*
 611          * Clear the transmit underrun bit.
 612          */
 613         Ser2HSSR0 = HSSR0_TUR;
 614
 615         /*
 616          * Do we need to change speed?  Note that we're lazy
 617          * here - we don't free the old rxskb.  We don't need
 618          * to allocate a buffer either.
 619          */
 620         if (si->newspeed) {
 621                 sa1100_irda_set_speed(si, si->newspeed);
 622                 si->newspeed = 0;
 623         }
 624
 625         /*
 626          * Start reception.  This disables the transmitter for
 627          * us.  This will be using the existing RX buffer.
 628          */
 629         sa1100_irda_rx_dma_start(si);
 630
 631         /*
 632          * Account and free the packet.
 633          */
 634         if (skb) {
 635                 dma_unmap_single(si->dev, si->txbuf_dma, skb->len, DMA_TO_DEVICE);
 636                 dev->stats.tx_packets ++;
 637                 dev->stats.tx_bytes += skb->len;
 638                 dev_kfree_skb_irq(skb);
 639         }
 640
 641         /*
 642          * Make sure that the TX queue is available for sending
 643          * (for retries).  TX has priority over RX at all times.
 644          */
 645         netif_wake_queue(dev);
 646 }
 647
 648 static int sa1100_irda_hard_xmit(struct sk_buff *skb, struct net_device *dev)
 649 {
 650         struct sa1100_irda *si = netdev_priv(dev);
 651         int speed = irda_get_next_speed(skb);
 652
 653         /*
 654          * Does this packet contain a request to change the interface
 655          * speed?  If so, remember it until we complete the transmission
 656          * of this frame.
 657          */
 658         if (speed != si->speed && speed != -1)
 659                 si->newspeed = speed;
 660
 661         /*
 662          * If this is an empty frame, we can bypass a lot.
 663          */
 664         if (skb->len == 0) {
 665                 if (si->newspeed) {
 666                         si->newspeed = 0;
 667                         sa1100_irda_set_speed(si, speed);
 668                 }
 669                 dev_kfree_skb(skb);
 670                 return 0;
 671         }
 672
 673         if (!IS_FIR(si)) {
 674                 netif_stop_queue(dev);
 675
 676                 si->tx_buff.data = si->tx_buff.head;
 677                 si->tx_buff.len  = async_wrap_skb(skb, si->tx_buff.data,
 678                                                   si->tx_buff.truesize);
 679
 680                 /*
 681                  * Set the transmit interrupt enable.  This will fire
 682                  * off an interrupt immediately.  Note that we disable
 683                  * the receiver so we won't get spurious characteres
 684                  * received.
 685                  */
 686                 Ser2UTCR3 = UTCR3_TIE | UTCR3_TXE;
 687
 688                 dev_kfree_skb(skb);
 689         } else {
 690                 int mtt = irda_get_mtt(skb);
 691
 692                 /*
 693                  * We must not be transmitting...
 694                  */
 695                 BUG_ON(si->txskb);
 696
 697                 netif_stop_queue(dev);
 698
 699                 si->txskb = skb;
 700                 si->txbuf_dma = dma_map_single(si->dev, skb->data,
 701                                          skb->len, DMA_TO_DEVICE);
 702
 703                 sa1100_start_dma(si->txdma, si->txbuf_dma, skb->len);
 704
 705                 /*
 706                  * If we have a mean turn-around time, impose the specified
 707                  * specified delay.  We could shorten this by timing from
 708                  * the point we received the packet.
 709                  */
 710                 if (mtt)
 711                         udelay(mtt);
 712
 713                 Ser2HSCR0 = si->hscr0 | HSCR0_HSSP | HSCR0_TXE;
 714         }
 715
 716         dev->trans_start = jiffies;
 717
 718         return 0;
 719 }
 720
 721 static int
 722 sa1100_irda_ioctl(struct net_device *dev, struct ifreq *ifreq, int cmd)
 723 {
 724         struct if_irda_req *rq = (struct if_irda_req *)ifreq;
 725         struct sa1100_irda *si = netdev_priv(dev);
 726         int ret = -EOPNOTSUPP;
 727
 728         switch (cmd) {
 729         case SIOCSBANDWIDTH:
 730                 if (capable(CAP_NET_ADMIN)) {
 731                         /*
 732                          * We are unable to set the speed if the
 733                          * device is not running.
 734                          */
 735                         if (si->open) {
 736                                 ret = sa1100_irda_set_speed(si,
 737                                                 rq->ifr_baudrate);
 738                         } else {
 739                                 printk("sa1100_irda_ioctl: SIOCSBANDWIDTH: !netif_running\n");
 740                                 ret = 0;
 741                         }
 742                 }
 743                 break;
 744
 745         case SIOCSMEDIABUSY:
 746                 ret = -EPERM;
 747                 if (capable(CAP_NET_ADMIN)) {
 748                         irda_device_set_media_busy(dev, TRUE);
 749                         ret = 0;
 750                 }
 751                 break;
 752
 753         case SIOCGRECEIVING:
 754                 rq->ifr_receiving = IS_FIR(si) ? 0
 755                                         : si->rx_buff.state != OUTSIDE_FRAME;
 756                 break;
 757
 758         default:
 759                 break;
 760         }
 761
 762         return ret;
 763 }
 764
 765 static int sa1100_irda_start(struct net_device *dev)
 766 {
 767         struct sa1100_irda *si = netdev_priv(dev);
 768         int err;
 769
 770         si->speed = 9600;
 771
 772         err = request_irq(dev->irq, sa1100_irda_irq, 0, dev->name, dev);
 773         if (err)
 774                 goto err_irq;
 775
 776         err = sa1100_request_dma(DMA_Ser2HSSPRd, "IrDA receive",
 777                                  NULL, NULL, &si->rxdma);
 778         if (err)
 779                 goto err_rx_dma;
 780
 781         err = sa1100_request_dma(DMA_Ser2HSSPWr, "IrDA transmit",
 782                                  sa1100_irda_txdma_irq, dev, &si->txdma);
 783         if (err)
 784                 goto err_tx_dma;
 785
 786         /*
 787          * The interrupt must remain disabled for now.
 788          */
 789         disable_irq(dev->irq);
 790
 791         /*
 792          * Setup the serial port for the specified speed.
 793          */
 794         err = sa1100_irda_startup(si);
 795         if (err)
 796                 goto err_startup;
 797
 798         /*
 799          * Open a new IrLAP layer instance.
 800          */
 801         si->irlap = irlap_open(dev, &si->qos, "sa1100");
 802         err = -ENOMEM;
 803         if (!si->irlap)
 804                 goto err_irlap;
 805
 806         /*
 807          * Now enable the interrupt and start the queue
 808          */
 809         si->open = 1;
 810         sa1100_set_power(si, power_level); /* low power mode */
 811         enable_irq(dev->irq);
 812         netif_start_queue(dev);
 813         return 0;
 814
 815 err_irlap:
 816         si->open = 0;
 817         sa1100_irda_shutdown(si);
 818 err_startup:
 819         sa1100_free_dma(si->txdma);
 820 err_tx_dma:
 821         sa1100_free_dma(si->rxdma);
 822 err_rx_dma:
 823         free_irq(dev->irq, dev);
 824 err_irq:
 825         return err;
 826 }
 827
 828 static int sa1100_irda_stop(struct net_device *dev)
 829 {
 830         struct sa1100_irda *si = netdev_priv(dev);
 831
 832         disable_irq(dev->irq);
 833         sa1100_irda_shutdown(si);
 834
 835         /*
 836          * If we have been doing DMA receive, make sure we
 837          * tidy that up cleanly.
 838          */
 839         if (si->rxskb) {
 840                 dma_unmap_single(si->dev, si->rxbuf_dma, HPSIR_MAX_RXLEN,
 841                                  DMA_FROM_DEVICE);
 842                 dev_kfree_skb(si->rxskb);
 843                 si->rxskb = NULL;
 844         }
 845
 846         /* Stop IrLAP */
 847         if (si->irlap) {
 848                 irlap_close(si->irlap);
 849                 si->irlap = NULL;
 850         }
 851
 852         netif_stop_queue(dev);
 853         si->open = 0;
 854
 855         /*
 856          * Free resources
 857          */
 858         sa1100_free_dma(si->txdma);
 859         sa1100_free_dma(si->rxdma);
 860         free_irq(dev->irq, dev);
 861
 862         sa1100_set_power(si, 0);
 863
 864         return 0;
 865 }
 866
 867 static int sa1100_irda_init_iobuf(iobuff_t *io, int size)
 868 {
 869         io->head = kmalloc(size, GFP_KERNEL | GFP_DMA);
 870         if (io->head != NULL) {
 871                 io->truesize = size;
 872                 io->in_frame = FALSE;
 873                 io->state    = OUTSIDE_FRAME;
 874                 io->data     = io->head;
 875         }
 876         return io->head ? 0 : -ENOMEM;
 877 }
 878
 879 static const struct net_device_ops sa1100_irda_netdev_ops = {
 880         .ndo_open               = sa1100_irda_start,
 881         .ndo_stop               = sa1100_irda_stop,
 882         .ndo_start_xmit         = sa1100_irda_hard_xmit,
 883         .ndo_do_ioctl           = sa1100_irda_ioctl,
 884         .ndo_change_mtu         = eth_change_mtu,
 885         .ndo_validate_addr      = eth_validate_addr,
 886         .ndo_set_mac_address    = eth_mac_addr,
 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 = netdev_priv(dev);
 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->netdev_ops = &sa1100_irda_netdev_ops;
 928         dev->irq        = IRQ_Ser2ICP;
 929
 930         irda_init_max_qos_capabilies(&si->qos);
 931
 932         /*
 933          * We support original IRDA up to 115k2. (we don't currently
 934          * support 4Mbps).  Min Turn Time set to 1ms or greater.
 935          */
 936         baudrate_mask = IR_9600;
 937
 938         switch (max_rate) {
 939         case 4000000:           baudrate_mask |= IR_4000000 << 8;
 940         case 115200:            baudrate_mask |= IR_115200;
 941         case 57600:             baudrate_mask |= IR_57600;
 942         case 38400:             baudrate_mask |= IR_38400;
 943         case 19200:             baudrate_mask |= IR_19200;
 944         }
 945
 946         si->qos.baud_rate.bits &= baudrate_mask;
 947         si->qos.min_turn_time.bits = 7;
 948
 949         irda_qos_bits_to_value(&si->qos);
 950
 951         si->utcr4 = UTCR4_HPSIR;
 952         if (tx_lpm)
 953                 si->utcr4 |= UTCR4_Z1_6us;
 954
 955         /*
 956          * Initially enable HP-SIR modulation, and ensure that the port
 957          * is disabled.
 958          */
 959         Ser2UTCR3 = 0;
 960         Ser2UTCR4 = si->utcr4;
 961         Ser2HSCR0 = HSCR0_UART;
 962
 963         err = register_netdev(dev);
 964         if (err == 0)
 965                 platform_set_drvdata(pdev, dev);
 966
 967         if (err) {
 968  err_mem_5:
 969                 kfree(si->tx_buff.head);
 970                 kfree(si->rx_buff.head);
 971                 free_netdev(dev);
 972  err_mem_4:
 973                 release_mem_region(__PREG(Ser2HSCR2), 0x04);
 974  err_mem_3:
 975                 release_mem_region(__PREG(Ser2HSCR0), 0x1c);
 976  err_mem_2:
 977                 release_mem_region(__PREG(Ser2UTCR0), 0x24);
 978         }
 979  err_mem_1:
 980         return err;
 981 }
 982
 983 static int sa1100_irda_remove(struct platform_device *pdev)
 984 {
 985         struct net_device *dev = platform_get_drvdata(pdev);
 986
 987         if (dev) {
 988                 struct sa1100_irda *si = netdev_priv(dev);
 989                 unregister_netdev(dev);
 990                 kfree(si->tx_buff.head);
 991                 kfree(si->rx_buff.head);
 992                 free_netdev(dev);
 993         }
 994
 995         release_mem_region(__PREG(Ser2HSCR2), 0x04);
 996         release_mem_region(__PREG(Ser2HSCR0), 0x1c);
 997         release_mem_region(__PREG(Ser2UTCR0), 0x24);
 998
 999         return 0;
1000 }
1001
1002 static struct platform_driver sa1100ir_driver = {
1003         .probe          = sa1100_irda_probe,
1004         .remove         = sa1100_irda_remove,
1005         .suspend        = sa1100_irda_suspend,
1006         .resume         = sa1100_irda_resume,
1007         .driver         = {
1008                 .name   = "sa11x0-ir",
1009                 .owner  = THIS_MODULE,
1010         },
1011 };
1012
1013 static int __init sa1100_irda_init(void)
1014 {
1015         /*
1016          * Limit power level a sensible range.
1017          */
1018         if (power_level < 1)
1019                 power_level = 1;
1020         if (power_level > 3)
1021                 power_level = 3;
1022
1023         return platform_driver_register(&sa1100ir_driver);
1024 }
1025
1026 static void __exit sa1100_irda_exit(void)
1027 {
1028         platform_driver_unregister(&sa1100ir_driver);
1029 }
1030
1031 module_init(sa1100_irda_init);
1032 module_exit(sa1100_irda_exit);
1033 module_param(power_level, int, 0);
1034 module_param(tx_lpm, int, 0);
1035 module_param(max_rate, int, 0);
1036
1037 MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
1038 MODULE_DESCRIPTION("StrongARM SA1100 IrDA driver");
1039 MODULE_LICENSE("GPL");
1040 MODULE_PARM_DESC(power_level, "IrDA power level, 1 (low) to 3 (high)");
1041 MODULE_PARM_DESC(tx_lpm, "Enable transmitter low power (1.6us) mode");
1042 MODULE_PARM_DESC(max_rate, "Maximum baud rate (4000000, 115200, 57600, 38400, 19200, 9600)");
1043 MODULE_ALIAS("platform:sa11x0-ir");