drivers/net/irda/bfin_sir.c

   1 /*
   2  * Blackfin Infra-red Driver
   3  *
   4  * Copyright 2006-2009 Analog Devices Inc.
   5  *
   6  * Enter bugs at http://blackfin.uclinux.org/
   7  *
   8  * Licensed under the GPL-2 or later.
   9  *
  10  */
  11 #include "bfin_sir.h"
  12
  13 #ifdef CONFIG_SIR_BFIN_DMA
  14 #define DMA_SIR_RX_XCNT        10
  15 #define DMA_SIR_RX_YCNT        (PAGE_SIZE / DMA_SIR_RX_XCNT)
  16 #define DMA_SIR_RX_FLUSH_JIFS  (HZ * 4 / 250)
  17 #endif
  18
  19 #if ANOMALY_05000447
  20 static int max_rate = 57600;
  21 #else
  22 static int max_rate = 115200;
  23 #endif
  24
  25 static void turnaround_delay(unsigned long last_jif, int mtt)
  26 {
  27         long ticks;
  28
  29         mtt = mtt < 10000 ? 10000 : mtt;
  30         ticks = 1 + mtt / (USEC_PER_SEC / HZ);
  31         schedule_timeout_uninterruptible(ticks);
  32 }
  33
  34 static void __devinit bfin_sir_init_ports(struct bfin_sir_port *sp, struct platform_device *pdev)
  35 {
  36         int i;
  37         struct resource *res;
  38
  39         for (i = 0; i < pdev->num_resources; i++) {
  40                 res = &pdev->resource[i];
  41                 switch (res->flags) {
  42                 case IORESOURCE_MEM:
  43                         sp->membase   = (void __iomem *)res->start;
  44                         break;
  45                 case IORESOURCE_IRQ:
  46                         sp->irq = res->start;
  47                         break;
  48                 case IORESOURCE_DMA:
  49                         sp->rx_dma_channel = res->start;
  50                         sp->tx_dma_channel = res->end;
  51                         break;
  52                 default:
  53                         break;
  54                 }
  55         }
  56
  57         sp->clk = get_sclk();
  58 #ifdef CONFIG_SIR_BFIN_DMA
  59         sp->tx_done        = 1;
  60         init_timer(&(sp->rx_dma_timer));
  61 #endif
  62 }
  63
  64 static void bfin_sir_stop_tx(struct bfin_sir_port *port)
  65 {
  66 #ifdef CONFIG_SIR_BFIN_DMA
  67         disable_dma(port->tx_dma_channel);
  68 #endif
  69
  70         while (!(SIR_UART_GET_LSR(port) & THRE)) {
  71                 cpu_relax();
  72                 continue;
  73         }
  74
  75         SIR_UART_STOP_TX(port);
  76 }
  77
  78 static void bfin_sir_enable_tx(struct bfin_sir_port *port)
  79 {
  80         SIR_UART_ENABLE_TX(port);
  81 }
  82
  83 static void bfin_sir_stop_rx(struct bfin_sir_port *port)
  84 {
  85         SIR_UART_STOP_RX(port);
  86 }
  87
  88 static void bfin_sir_enable_rx(struct bfin_sir_port *port)
  89 {
  90         SIR_UART_ENABLE_RX(port);
  91 }
  92
  93 static int bfin_sir_set_speed(struct bfin_sir_port *port, int speed)
  94 {
  95         int ret = -EINVAL;
  96         unsigned int quot;
  97         unsigned short val, lsr, lcr;
  98         static int utime;
  99         int count = 10;
 100
 101         lcr = WLS(8);
 102
 103         switch (speed) {
 104         case 9600:
 105         case 19200:
 106         case 38400:
 107         case 57600:
 108         case 115200:
 109
 110                 quot = (port->clk + (8 * speed)) / (16 * speed)\
 111                                                 - ANOMALY_05000230;
 112
 113                 do {
 114                         udelay(utime);
 115                         lsr = SIR_UART_GET_LSR(port);
 116                 } while (!(lsr & TEMT) && count--);
 117
 118                 /* The useconds for 1 bits to transmit */
 119                 utime = 1000000 / speed + 1;
 120
 121                 /* Clear UCEN bit to reset the UART state machine
 122                  * and control registers
 123                  */
 124                 val = SIR_UART_GET_GCTL(port);
 125                 val &= ~UCEN;
 126                 SIR_UART_PUT_GCTL(port, val);
 127
 128                 /* Set DLAB in LCR to Access THR RBR IER */
 129                 SIR_UART_SET_DLAB(port);
 130                 SSYNC();
 131
 132                 SIR_UART_PUT_DLL(port, quot & 0xFF);
 133                 SIR_UART_PUT_DLH(port, (quot >> 8) & 0xFF);
 134                 SSYNC();
 135
 136                 /* Clear DLAB in LCR */
 137                 SIR_UART_CLEAR_DLAB(port);
 138                 SSYNC();
 139
 140                 SIR_UART_PUT_LCR(port, lcr);
 141
 142                 val = SIR_UART_GET_GCTL(port);
 143                 val |= UCEN;
 144                 SIR_UART_PUT_GCTL(port, val);
 145
 146                 ret = 0;
 147                 break;
 148         default:
 149                 printk(KERN_WARNING "bfin_sir: Invalid speed %d\n", speed);
 150                 break;
 151         }
 152
 153         val = SIR_UART_GET_GCTL(port);
 154         /* If not add the 'RPOLC', we can't catch the receive interrupt.
 155          * It's related with the HW layout and the IR transiver.
 156          */
 157         val |= IREN | RPOLC;
 158         SIR_UART_PUT_GCTL(port, val);
 159         return ret;
 160 }
 161
 162 static int bfin_sir_is_receiving(struct net_device *dev)
 163 {
 164         struct bfin_sir_self *self = netdev_priv(dev);
 165         struct bfin_sir_port *port = self->sir_port;
 166
 167         if (!(SIR_UART_GET_IER(port) & ERBFI))
 168                 return 0;
 169         return self->rx_buff.state != OUTSIDE_FRAME;
 170 }
 171
 172 #ifdef CONFIG_SIR_BFIN_PIO
 173 static void bfin_sir_tx_chars(struct net_device *dev)
 174 {
 175         unsigned int chr;
 176         struct bfin_sir_self *self = netdev_priv(dev);
 177         struct bfin_sir_port *port = self->sir_port;
 178
 179         if (self->tx_buff.len != 0) {
 180                 chr = *(self->tx_buff.data);
 181                 SIR_UART_PUT_CHAR(port, chr);
 182                 self->tx_buff.data++;
 183                 self->tx_buff.len--;
 184         } else {
 185                 self->stats.tx_packets++;
 186                 self->stats.tx_bytes += self->tx_buff.data - self->tx_buff.head;
 187                 if (self->newspeed) {
 188                         bfin_sir_set_speed(port, self->newspeed);
 189                         self->speed = self->newspeed;
 190                         self->newspeed = 0;
 191                 }
 192                 bfin_sir_stop_tx(port);
 193                 bfin_sir_enable_rx(port);
 194                 /* I'm hungry! */
 195                 netif_wake_queue(dev);
 196         }
 197 }
 198
 199 static void bfin_sir_rx_chars(struct net_device *dev)
 200 {
 201         struct bfin_sir_self *self = netdev_priv(dev);
 202         struct bfin_sir_port *port = self->sir_port;
 203         unsigned char ch;
 204
 205         SIR_UART_CLEAR_LSR(port);
 206         ch = SIR_UART_GET_CHAR(port);
 207         async_unwrap_char(dev, &self->stats, &self->rx_buff, ch);
 208         dev->last_rx = jiffies;
 209 }
 210
 211 static irqreturn_t bfin_sir_rx_int(int irq, void *dev_id)
 212 {
 213         struct net_device *dev = dev_id;
 214         struct bfin_sir_self *self = netdev_priv(dev);
 215         struct bfin_sir_port *port = self->sir_port;
 216
 217         spin_lock(&self->lock);
 218         while ((SIR_UART_GET_LSR(port) & DR))
 219                 bfin_sir_rx_chars(dev);
 220         spin_unlock(&self->lock);
 221
 222         return IRQ_HANDLED;
 223 }
 224
 225 static irqreturn_t bfin_sir_tx_int(int irq, void *dev_id)
 226 {
 227         struct net_device *dev = dev_id;
 228         struct bfin_sir_self *self = netdev_priv(dev);
 229         struct bfin_sir_port *port = self->sir_port;
 230
 231         spin_lock(&self->lock);
 232         if (SIR_UART_GET_LSR(port) & THRE)
 233                 bfin_sir_tx_chars(dev);
 234         spin_unlock(&self->lock);
 235
 236         return IRQ_HANDLED;
 237 }
 238 #endif /* CONFIG_SIR_BFIN_PIO */
 239
 240 #ifdef CONFIG_SIR_BFIN_DMA
 241 static void bfin_sir_dma_tx_chars(struct net_device *dev)
 242 {
 243         struct bfin_sir_self *self = netdev_priv(dev);
 244         struct bfin_sir_port *port = self->sir_port;
 245
 246         if (!port->tx_done)
 247                 return;
 248         port->tx_done = 0;
 249
 250         if (self->tx_buff.len == 0) {
 251                 self->stats.tx_packets++;
 252                 if (self->newspeed) {
 253                         bfin_sir_set_speed(port, self->newspeed);
 254                         self->speed = self->newspeed;
 255                         self->newspeed = 0;
 256                 }
 257                 bfin_sir_enable_rx(port);
 258                 port->tx_done = 1;
 259                 netif_wake_queue(dev);
 260                 return;
 261         }
 262
 263         blackfin_dcache_flush_range((unsigned long)(self->tx_buff.data),
 264                 (unsigned long)(self->tx_buff.data+self->tx_buff.len));
 265         set_dma_config(port->tx_dma_channel,
 266                 set_bfin_dma_config(DIR_READ, DMA_FLOW_STOP,
 267                         INTR_ON_BUF, DIMENSION_LINEAR, DATA_SIZE_8,
 268                         DMA_SYNC_RESTART));
 269         set_dma_start_addr(port->tx_dma_channel,
 270                 (unsigned long)(self->tx_buff.data));
 271         set_dma_x_count(port->tx_dma_channel, self->tx_buff.len);
 272         set_dma_x_modify(port->tx_dma_channel, 1);
 273         enable_dma(port->tx_dma_channel);
 274 }
 275
 276 static irqreturn_t bfin_sir_dma_tx_int(int irq, void *dev_id)
 277 {
 278         struct net_device *dev = dev_id;
 279         struct bfin_sir_self *self = netdev_priv(dev);
 280         struct bfin_sir_port *port = self->sir_port;
 281
 282         spin_lock(&self->lock);
 283         if (!(get_dma_curr_irqstat(port->tx_dma_channel) & DMA_RUN)) {
 284                 clear_dma_irqstat(port->tx_dma_channel);
 285                 bfin_sir_stop_tx(port);
 286
 287                 self->stats.tx_packets++;
 288                 self->stats.tx_bytes += self->tx_buff.len;
 289                 self->tx_buff.len = 0;
 290                 if (self->newspeed) {
 291                         bfin_sir_set_speed(port, self->newspeed);
 292                         self->speed = self->newspeed;
 293                         self->newspeed = 0;
 294                 }
 295                 bfin_sir_enable_rx(port);
 296                 /* I'm hungry! */
 297                 netif_wake_queue(dev);
 298                 port->tx_done = 1;
 299         }
 300         spin_unlock(&self->lock);
 301
 302         return IRQ_HANDLED;
 303 }
 304
 305 static void bfin_sir_dma_rx_chars(struct net_device *dev)
 306 {
 307         struct bfin_sir_self *self = netdev_priv(dev);
 308         struct bfin_sir_port *port = self->sir_port;
 309         int i;
 310
 311         SIR_UART_CLEAR_LSR(port);
 312
 313         for (i = port->rx_dma_buf.head; i < port->rx_dma_buf.tail; i++)
 314                 async_unwrap_char(dev, &self->stats, &self->rx_buff, port->rx_dma_buf.buf[i]);
 315 }
 316
 317 void bfin_sir_rx_dma_timeout(struct net_device *dev)
 318 {
 319         struct bfin_sir_self *self = netdev_priv(dev);
 320         struct bfin_sir_port *port = self->sir_port;
 321         int x_pos, pos;
 322         unsigned long flags;
 323
 324         spin_lock_irqsave(&self->lock, flags);
 325         x_pos = DMA_SIR_RX_XCNT - get_dma_curr_xcount(port->rx_dma_channel);
 326         if (x_pos == DMA_SIR_RX_XCNT)
 327                 x_pos = 0;
 328
 329         pos = port->rx_dma_nrows * DMA_SIR_RX_XCNT + x_pos;
 330
 331         if (pos > port->rx_dma_buf.tail) {
 332                 port->rx_dma_buf.tail = pos;
 333                 bfin_sir_dma_rx_chars(dev);
 334                 port->rx_dma_buf.head = port->rx_dma_buf.tail;
 335         }
 336         spin_unlock_irqrestore(&self->lock, flags);
 337 }
 338
 339 static irqreturn_t bfin_sir_dma_rx_int(int irq, void *dev_id)
 340 {
 341         struct net_device *dev = dev_id;
 342         struct bfin_sir_self *self = netdev_priv(dev);
 343         struct bfin_sir_port *port = self->sir_port;
 344         unsigned short irqstat;
 345
 346         spin_lock(&self->lock);
 347
 348         port->rx_dma_nrows++;
 349         port->rx_dma_buf.tail = DMA_SIR_RX_XCNT * port->rx_dma_nrows;
 350         bfin_sir_dma_rx_chars(dev);
 351         if (port->rx_dma_nrows >= DMA_SIR_RX_YCNT) {
 352                 port->rx_dma_nrows = 0;
 353                 port->rx_dma_buf.tail = 0;
 354         }
 355         port->rx_dma_buf.head = port->rx_dma_buf.tail;
 356
 357         irqstat = get_dma_curr_irqstat(port->rx_dma_channel);
 358         clear_dma_irqstat(port->rx_dma_channel);
 359         spin_unlock(&self->lock);
 360
 361         mod_timer(&port->rx_dma_timer, jiffies + DMA_SIR_RX_FLUSH_JIFS);
 362         return IRQ_HANDLED;
 363 }
 364 #endif /* CONFIG_SIR_BFIN_DMA */
 365
 366 static int bfin_sir_startup(struct bfin_sir_port *port, struct net_device *dev)
 367 {
 368 #ifdef CONFIG_SIR_BFIN_DMA
 369         dma_addr_t dma_handle;
 370 #endif /* CONFIG_SIR_BFIN_DMA */
 371
 372         if (request_dma(port->rx_dma_channel, "BFIN_UART_RX") < 0) {
 373                 dev_warn(&dev->dev, "Unable to attach SIR RX DMA channel\n");
 374                 return -EBUSY;
 375         }
 376
 377         if (request_dma(port->tx_dma_channel, "BFIN_UART_TX") < 0) {
 378                 dev_warn(&dev->dev, "Unable to attach SIR TX DMA channel\n");
 379                 free_dma(port->rx_dma_channel);
 380                 return -EBUSY;
 381         }
 382
 383 #ifdef CONFIG_SIR_BFIN_DMA
 384
 385         set_dma_callback(port->rx_dma_channel, bfin_sir_dma_rx_int, dev);
 386         set_dma_callback(port->tx_dma_channel, bfin_sir_dma_tx_int, dev);
 387
 388         port->rx_dma_buf.buf = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_DMA);
 389         port->rx_dma_buf.head = 0;
 390         port->rx_dma_buf.tail = 0;
 391         port->rx_dma_nrows = 0;
 392
 393         set_dma_config(port->rx_dma_channel,
 394                                 set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO,
 395                                                                         INTR_ON_ROW, DIMENSION_2D,
 396                                                                         DATA_SIZE_8, DMA_SYNC_RESTART));
 397         set_dma_x_count(port->rx_dma_channel, DMA_SIR_RX_XCNT);
 398         set_dma_x_modify(port->rx_dma_channel, 1);
 399         set_dma_y_count(port->rx_dma_channel, DMA_SIR_RX_YCNT);
 400         set_dma_y_modify(port->rx_dma_channel, 1);
 401         set_dma_start_addr(port->rx_dma_channel, (unsigned long)port->rx_dma_buf.buf);
 402         enable_dma(port->rx_dma_channel);
 403
 404         port->rx_dma_timer.data = (unsigned long)(dev);
 405         port->rx_dma_timer.function = (void *)bfin_sir_rx_dma_timeout;
 406
 407 #else
 408
 409         if (request_irq(port->irq, bfin_sir_rx_int, IRQF_DISABLED, "BFIN_SIR_RX", dev)) {
 410                 dev_warn(&dev->dev, "Unable to attach SIR RX interrupt\n");
 411                 return -EBUSY;
 412         }
 413
 414         if (request_irq(port->irq+1, bfin_sir_tx_int, IRQF_DISABLED, "BFIN_SIR_TX", dev)) {
 415                 dev_warn(&dev->dev, "Unable to attach SIR TX interrupt\n");
 416                 free_irq(port->irq, dev);
 417                 return -EBUSY;
 418         }
 419 #endif
 420
 421         return 0;
 422 }
 423
 424 static void bfin_sir_shutdown(struct bfin_sir_port *port, struct net_device *dev)
 425 {
 426         unsigned short val;
 427
 428         bfin_sir_stop_rx(port);
 429         SIR_UART_DISABLE_INTS(port);
 430
 431         val = SIR_UART_GET_GCTL(port);
 432         val &= ~(UCEN | IREN | RPOLC);
 433         SIR_UART_PUT_GCTL(port, val);
 434
 435 #ifdef CONFIG_SIR_BFIN_DMA
 436         disable_dma(port->tx_dma_channel);
 437         disable_dma(port->rx_dma_channel);
 438         del_timer(&(port->rx_dma_timer));
 439         dma_free_coherent(NULL, PAGE_SIZE, port->rx_dma_buf.buf, 0);
 440 #else
 441         free_irq(port->irq+1, dev);
 442         free_irq(port->irq, dev);
 443 #endif
 444         free_dma(port->tx_dma_channel);
 445         free_dma(port->rx_dma_channel);
 446 }
 447
 448 #ifdef CONFIG_PM
 449 static int bfin_sir_suspend(struct platform_device *pdev, pm_message_t state)
 450 {
 451         struct bfin_sir_port *sir_port;
 452         struct net_device *dev;
 453         struct bfin_sir_self *self;
 454
 455         sir_port = platform_get_drvdata(pdev);
 456         if (!sir_port)
 457                 return 0;
 458
 459         dev = sir_port->dev;
 460         self = netdev_priv(dev);
 461         if (self->open) {
 462                 flush_work(&self->work);
 463                 bfin_sir_shutdown(self->sir_port, dev);
 464                 netif_device_detach(dev);
 465         }
 466
 467         return 0;
 468 }
 469 static int bfin_sir_resume(struct platform_device *pdev)
 470 {
 471         struct bfin_sir_port *sir_port;
 472         struct net_device *dev;
 473         struct bfin_sir_self *self;
 474         struct bfin_sir_port *port;
 475
 476         sir_port = platform_get_drvdata(pdev);
 477         if (!sir_port)
 478                 return 0;
 479
 480         dev = sir_port->dev;
 481         self = netdev_priv(dev);
 482         port = self->sir_port;
 483         if (self->open) {
 484                 if (self->newspeed) {
 485                         self->speed = self->newspeed;
 486                         self->newspeed = 0;
 487                 }
 488                 bfin_sir_startup(port, dev);
 489                 bfin_sir_set_speed(port, 9600);
 490                 bfin_sir_enable_rx(port);
 491                 netif_device_attach(dev);
 492         }
 493         return 0;
 494 }
 495 #else
 496 #define bfin_sir_suspend   NULL
 497 #define bfin_sir_resume    NULL
 498 #endif
 499
 500 static void bfin_sir_send_work(struct work_struct *work)
 501 {
 502         struct bfin_sir_self  *self = container_of(work, struct bfin_sir_self, work);
 503         struct net_device *dev = self->sir_port->dev;
 504         struct bfin_sir_port *port = self->sir_port;
 505         unsigned short val;
 506         int tx_cnt = 10;
 507
 508         while (bfin_sir_is_receiving(dev) && --tx_cnt)
 509                 turnaround_delay(dev->last_rx, self->mtt);
 510
 511         bfin_sir_stop_rx(port);
 512
 513         /* To avoid losting RX interrupt, we reset IR function before
 514          * sending data. We also can set the speed, which will
 515          * reset all the UART.
 516          */
 517         val = SIR_UART_GET_GCTL(port);
 518         val &= ~(IREN | RPOLC);
 519         SIR_UART_PUT_GCTL(port, val);
 520         SSYNC();
 521         val |= IREN | RPOLC;
 522         SIR_UART_PUT_GCTL(port, val);
 523         SSYNC();
 524         /* bfin_sir_set_speed(port, self->speed); */
 525
 526 #ifdef CONFIG_SIR_BFIN_DMA
 527         bfin_sir_dma_tx_chars(dev);
 528 #endif
 529         bfin_sir_enable_tx(port);
 530         dev->trans_start = jiffies;
 531 }
 532
 533 static int bfin_sir_hard_xmit(struct sk_buff *skb, struct net_device *dev)
 534 {
 535         struct bfin_sir_self *self = netdev_priv(dev);
 536         int speed = irda_get_next_speed(skb);
 537
 538         netif_stop_queue(dev);
 539
 540         self->mtt = irda_get_mtt(skb);
 541
 542         if (speed != self->speed && speed != -1)
 543                 self->newspeed = speed;
 544
 545         self->tx_buff.data = self->tx_buff.head;
 546         if (skb->len == 0)
 547                 self->tx_buff.len = 0;
 548         else
 549                 self->tx_buff.len = async_wrap_skb(skb, self->tx_buff.data, self->tx_buff.truesize);
 550
 551         schedule_work(&self->work);
 552         dev_kfree_skb(skb);
 553
 554         return 0;
 555 }
 556
 557 static int bfin_sir_ioctl(struct net_device *dev, struct ifreq *ifreq, int cmd)
 558 {
 559         struct if_irda_req *rq = (struct if_irda_req *)ifreq;
 560         struct bfin_sir_self *self = netdev_priv(dev);
 561         struct bfin_sir_port *port = self->sir_port;
 562         int ret = 0;
 563
 564         switch (cmd) {
 565         case SIOCSBANDWIDTH:
 566                 if (capable(CAP_NET_ADMIN)) {
 567                         if (self->open) {
 568                                 ret = bfin_sir_set_speed(port, rq->ifr_baudrate);
 569                                 bfin_sir_enable_rx(port);
 570                         } else {
 571                                 dev_warn(&dev->dev, "SIOCSBANDWIDTH: !netif_running\n");
 572                                 ret = 0;
 573                         }
 574                 }
 575                 break;
 576
 577         case SIOCSMEDIABUSY:
 578                 ret = -EPERM;
 579                 if (capable(CAP_NET_ADMIN)) {
 580                         irda_device_set_media_busy(dev, TRUE);
 581                         ret = 0;
 582                 }
 583                 break;
 584
 585         case SIOCGRECEIVING:
 586                 rq->ifr_receiving = bfin_sir_is_receiving(dev);
 587                 break;
 588
 589         default:
 590                 ret = -EOPNOTSUPP;
 591                 break;
 592         }
 593
 594         return ret;
 595 }
 596
 597 static struct net_device_stats *bfin_sir_stats(struct net_device *dev)
 598 {
 599         struct bfin_sir_self *self = netdev_priv(dev);
 600
 601         return &self->stats;
 602 }
 603
 604 static int bfin_sir_open(struct net_device *dev)
 605 {
 606         struct bfin_sir_self *self = netdev_priv(dev);
 607         struct bfin_sir_port *port = self->sir_port;
 608         int err = -ENOMEM;
 609
 610         self->newspeed = 0;
 611         self->speed = 9600;
 612
 613         spin_lock_init(&self->lock);
 614
 615         err = bfin_sir_startup(port, dev);
 616         if (err)
 617                 goto err_startup;
 618
 619         bfin_sir_set_speed(port, 9600);
 620
 621         self->irlap = irlap_open(dev, &self->qos, DRIVER_NAME);
 622         if (!self->irlap)
 623                 goto err_irlap;
 624
 625         INIT_WORK(&self->work, bfin_sir_send_work);
 626
 627         /*
 628          * Now enable the interrupt then start the queue
 629          */
 630         self->open = 1;
 631         bfin_sir_enable_rx(port);
 632
 633         netif_start_queue(dev);
 634
 635         return 0;
 636
 637 err_irlap:
 638         self->open = 0;
 639         bfin_sir_shutdown(port, dev);
 640 err_startup:
 641         return err;
 642 }
 643
 644 static int bfin_sir_stop(struct net_device *dev)
 645 {
 646         struct bfin_sir_self *self = netdev_priv(dev);
 647
 648         flush_work(&self->work);
 649         bfin_sir_shutdown(self->sir_port, dev);
 650
 651         if (self->rxskb) {
 652                 dev_kfree_skb(self->rxskb);
 653                 self->rxskb = NULL;
 654         }
 655
 656         /* Stop IrLAP */
 657         if (self->irlap) {
 658                 irlap_close(self->irlap);
 659                 self->irlap = NULL;
 660         }
 661
 662         netif_stop_queue(dev);
 663         self->open = 0;
 664
 665         return 0;
 666 }
 667
 668 static int bfin_sir_init_iobuf(iobuff_t *io, int size)
 669 {
 670         io->head = kmalloc(size, GFP_KERNEL);
 671         if (!io->head)
 672                 return -ENOMEM;
 673         io->truesize = size;
 674         io->in_frame = FALSE;
 675         io->state    = OUTSIDE_FRAME;
 676         io->data     = io->head;
 677         return 0;
 678 }
 679
 680 static int __devinit bfin_sir_probe(struct platform_device *pdev)
 681 {
 682         struct net_device *dev;
 683         struct bfin_sir_self *self;
 684         unsigned int baudrate_mask;
 685         struct bfin_sir_port *sir_port;
 686         int err;
 687
 688         if (pdev->id >= 0 && pdev->id < ARRAY_SIZE(per) && \
 689                                 per[pdev->id][3] == pdev->id) {
 690                 err = peripheral_request_list(per[pdev->id], DRIVER_NAME);
 691                 if (err)
 692                         return err;
 693         } else {
 694                 dev_err(&pdev->dev, "Invalid pdev id, please check board file\n");
 695                 return -ENODEV;
 696         }
 697
 698         err = -ENOMEM;
 699         sir_port = kmalloc(sizeof(*sir_port), GFP_KERNEL);
 700         if (!sir_port)
 701                 goto err_mem_0;
 702
 703         bfin_sir_init_ports(sir_port, pdev);
 704
 705         dev = alloc_irdadev(sizeof(*self));
 706         if (!dev)
 707                 goto err_mem_1;
 708
 709         self = netdev_priv(dev);
 710         self->dev = &pdev->dev;
 711         self->sir_port = sir_port;
 712         sir_port->dev = dev;
 713
 714         err = bfin_sir_init_iobuf(&self->rx_buff, IRDA_SKB_MAX_MTU);
 715         if (err)
 716                 goto err_mem_2;
 717         err = bfin_sir_init_iobuf(&self->tx_buff, IRDA_SIR_MAX_FRAME);
 718         if (err)
 719                 goto err_mem_3;
 720
 721         dev->hard_start_xmit = bfin_sir_hard_xmit;
 722         dev->open            = bfin_sir_open;
 723         dev->stop            = bfin_sir_stop;
 724         dev->do_ioctl        = bfin_sir_ioctl;
 725         dev->get_stats       = bfin_sir_stats;
 726         dev->irq             = sir_port->irq;
 727
 728         irda_init_max_qos_capabilies(&self->qos);
 729
 730         baudrate_mask = IR_9600;
 731
 732         switch (max_rate) {
 733         case 115200:
 734                 baudrate_mask |= IR_115200;
 735         case 57600:
 736                 baudrate_mask |= IR_57600;
 737         case 38400:
 738                 baudrate_mask |= IR_38400;
 739         case 19200:
 740                 baudrate_mask |= IR_19200;
 741         case 9600:
 742                 break;
 743         default:
 744                 dev_warn(&pdev->dev, "Invalid maximum baud rate, using 9600\n");
 745         }
 746
 747         self->qos.baud_rate.bits &= baudrate_mask;
 748
 749         self->qos.min_turn_time.bits = 1; /* 10 ms or more */
 750
 751         irda_qos_bits_to_value(&self->qos);
 752
 753         err = register_netdev(dev);
 754
 755         if (err) {
 756                 kfree(self->tx_buff.head);
 757 err_mem_3:
 758                 kfree(self->rx_buff.head);
 759 err_mem_2:
 760                 free_netdev(dev);
 761 err_mem_1:
 762                 kfree(sir_port);
 763 err_mem_0:
 764                 peripheral_free_list(per[pdev->id]);
 765         } else
 766                 platform_set_drvdata(pdev, sir_port);
 767
 768         return err;
 769 }
 770
 771 static int __devexit bfin_sir_remove(struct platform_device *pdev)
 772 {
 773         struct bfin_sir_port *sir_port;
 774         struct net_device *dev = NULL;
 775         struct bfin_sir_self *self;
 776
 777         sir_port = platform_get_drvdata(pdev);
 778         if (!sir_port)
 779                 return 0;
 780         dev = sir_port->dev;
 781         self = netdev_priv(dev);
 782         unregister_netdev(dev);
 783         kfree(self->tx_buff.head);
 784         kfree(self->rx_buff.head);
 785         free_netdev(dev);
 786         kfree(sir_port);
 787         platform_set_drvdata(pdev, NULL);
 788
 789         return 0;
 790 }
 791
 792 static struct platform_driver bfin_ir_driver = {
 793         .probe   = bfin_sir_probe,
 794         .remove  = __devexit_p(bfin_sir_remove),
 795         .suspend = bfin_sir_suspend,
 796         .resume  = bfin_sir_resume,
 797         .driver  = {
 798                 .name = DRIVER_NAME,
 799         },
 800 };
 801
 802 static int __init bfin_sir_init(void)
 803 {
 804         return platform_driver_register(&bfin_ir_driver);
 805 }
 806
 807 static void __exit bfin_sir_exit(void)
 808 {
 809         platform_driver_unregister(&bfin_ir_driver);
 810 }
 811
 812 module_init(bfin_sir_init);
 813 module_exit(bfin_sir_exit);
 814
 815 module_param(max_rate, int, 0);
 816 MODULE_PARM_DESC(max_rate, "Maximum baud rate (115200, 57600, 38400, 19200, 9600)");
 817
 818 MODULE_AUTHOR("Graf Yang <graf.yang@analog.com>");
 819 MODULE_DESCRIPTION("Blackfin IrDA driver");
 820 MODULE_LICENSE("GPL");