LXR linux/drivers/net/irda/pxaficp

   1/*
   2 * linux/drivers/net/irda/pxaficp_ir.c
   3 *
   4 * Based on sa1100_ir.c by Russell King
   5 *
   6 * Changes copyright (C) 2003-2005 MontaVista Software, Inc.
   7 *
   8 * This program is free software; you can redistribute it and/or modify
   9 * it under the terms of the GNU General Public License version 2 as
  10 * published by the Free Software Foundation.
  11 *
  12 * Infra-red driver (SIR/FIR) for the PXA2xx embedded microprocessor
  13 *
  14 */
  15#include <linux/dma-mapping.h>
  16#include <linux/interrupt.h>
  17#include <linux/module.h>
  18#include <linux/netdevice.h>
  19#include <linux/etherdevice.h>
  20#include <linux/platform_device.h>
  21#include <linux/clk.h>
  22#include <linux/gpio.h>
  23#include <linux/slab.h>
  24
  25#include <net/irda/irda.h>
  26#include <net/irda/irmod.h>
  27#include <net/irda/wrapper.h>
  28#include <net/irda/irda_device.h>
  29
  30#include <mach/dma.h>
  31#include <linux/platform_data/irda-pxaficp.h>
  32#include <mach/regs-ost.h>
  33#include <mach/regs-uart.h>
  34
  35#define FICP            __REG(0x40800000)  /* Start of FICP area */
  36#define ICCR0           __REG(0x40800000)  /* ICP Control Register 0 */
  37#define ICCR1           __REG(0x40800004)  /* ICP Control Register 1 */
  38#define ICCR2           __REG(0x40800008)  /* ICP Control Register 2 */
  39#define ICDR            __REG(0x4080000c)  /* ICP Data Register */
  40#define ICSR0           __REG(0x40800014)  /* ICP Status Register 0 */
  41#define ICSR1           __REG(0x40800018)  /* ICP Status Register 1 */
  42
  43#define ICCR0_AME       (1 << 7)        /* Address match enable */
  44#define ICCR0_TIE       (1 << 6)        /* Transmit FIFO interrupt enable */
  45#define ICCR0_RIE       (1 << 5)        /* Receive FIFO interrupt enable */
  46#define ICCR0_RXE       (1 << 4)        /* Receive enable */
  47#define ICCR0_TXE       (1 << 3)        /* Transmit enable */
  48#define ICCR0_TUS       (1 << 2)        /* Transmit FIFO underrun select */
  49#define ICCR0_LBM       (1 << 1)        /* Loopback mode */
  50#define ICCR0_ITR       (1 << 0)        /* IrDA transmission */
  51
  52#define ICCR2_RXP       (1 << 3)        /* Receive Pin Polarity select */
  53#define ICCR2_TXP       (1 << 2)        /* Transmit Pin Polarity select */
  54#define ICCR2_TRIG      (3 << 0)        /* Receive FIFO Trigger threshold */
  55#define ICCR2_TRIG_8    (0 << 0)        /*      >= 8 bytes */
  56#define ICCR2_TRIG_16   (1 << 0)        /*      >= 16 bytes */
  57#define ICCR2_TRIG_32   (2 << 0)        /*      >= 32 bytes */
  58
  59#ifdef CONFIG_PXA27x
  60#define ICSR0_EOC       (1 << 6)        /* DMA End of Descriptor Chain */
  61#endif
  62#define ICSR0_FRE       (1 << 5)        /* Framing error */
  63#define ICSR0_RFS       (1 << 4)        /* Receive FIFO service request */
  64#define ICSR0_TFS       (1 << 3)        /* Transnit FIFO service request */
  65#define ICSR0_RAB       (1 << 2)        /* Receiver abort */
  66#define ICSR0_TUR       (1 << 1)        /* Trunsmit FIFO underun */
  67#define ICSR0_EIF       (1 << 0)        /* End/Error in FIFO */
  68
  69#define ICSR1_ROR       (1 << 6)        /* Receiver FIFO underrun  */
  70#define ICSR1_CRE       (1 << 5)        /* CRC error */
  71#define ICSR1_EOF       (1 << 4)        /* End of frame */
  72#define ICSR1_TNF       (1 << 3)        /* Transmit FIFO not full */
  73#define ICSR1_RNE       (1 << 2)        /* Receive FIFO not empty */
  74#define ICSR1_TBY       (1 << 1)        /* Tramsmiter busy flag */
  75#define ICSR1_RSY       (1 << 0)        /* Recevier synchronized flag */
  76
  77#define IrSR_RXPL_NEG_IS_ZERO (1<<4)
  78#define IrSR_RXPL_POS_IS_ZERO 0x0
  79#define IrSR_TXPL_NEG_IS_ZERO (1<<3)
  80#define IrSR_TXPL_POS_IS_ZERO 0x0
  81#define IrSR_XMODE_PULSE_1_6  (1<<2)
  82#define IrSR_XMODE_PULSE_3_16 0x0
  83#define IrSR_RCVEIR_IR_MODE   (1<<1)
  84#define IrSR_RCVEIR_UART_MODE 0x0
  85#define IrSR_XMITIR_IR_MODE   (1<<0)
  86#define IrSR_XMITIR_UART_MODE 0x0
  87
  88#define IrSR_IR_RECEIVE_ON (\
  89                IrSR_RXPL_NEG_IS_ZERO | \
  90                IrSR_TXPL_POS_IS_ZERO | \
  91                IrSR_XMODE_PULSE_3_16 | \
  92                IrSR_RCVEIR_IR_MODE   | \
  93                IrSR_XMITIR_UART_MODE)
  94
  95#define IrSR_IR_TRANSMIT_ON (\
  96                IrSR_RXPL_NEG_IS_ZERO | \
  97                IrSR_TXPL_POS_IS_ZERO | \
  98                IrSR_XMODE_PULSE_3_16 | \
  99                IrSR_RCVEIR_UART_MODE | \
 100                IrSR_XMITIR_IR_MODE)
 101
 102struct pxa_irda {
 103        int                     speed;
 104        int                     newspeed;
 105        unsigned long           last_oscr;
 106
 107        unsigned char           *dma_rx_buff;
 108        unsigned char           *dma_tx_buff;
 109        dma_addr_t              dma_rx_buff_phy;
 110        dma_addr_t              dma_tx_buff_phy;
 111        unsigned int            dma_tx_buff_len;
 112        int                     txdma;
 113        int                     rxdma;
 114
 115        int                     uart_irq;
 116        int                     icp_irq;
 117
 118        struct irlap_cb         *irlap;
 119        struct qos_info         qos;
 120
 121        iobuff_t                tx_buff;
 122        iobuff_t                rx_buff;
 123
 124        struct device           *dev;
 125        struct pxaficp_platform_data *pdata;
 126        struct clk              *fir_clk;
 127        struct clk              *sir_clk;
 128        struct clk              *cur_clk;
 129};
 130
 131static inline void pxa_irda_disable_clk(struct pxa_irda *si)
 132{
 133        if (si->cur_clk)
 134                clk_disable_unprepare(si->cur_clk);
 135        si->cur_clk = NULL;
 136}
 137
 138static inline void pxa_irda_enable_firclk(struct pxa_irda *si)
 139{
 140        si->cur_clk = si->fir_clk;
 141        clk_prepare_enable(si->fir_clk);
 142}
 143
 144static inline void pxa_irda_enable_sirclk(struct pxa_irda *si)
 145{
 146        si->cur_clk = si->sir_clk;
 147        clk_prepare_enable(si->sir_clk);
 148}
 149
 150
 151#define IS_FIR(si)              ((si)->speed >= 4000000)
 152#define IRDA_FRAME_SIZE_LIMIT   2047
 153
 154inline static void pxa_irda_fir_dma_rx_start(struct pxa_irda *si)
 155{
 156        DCSR(si->rxdma)  = DCSR_NODESC;
 157        DSADR(si->rxdma) = __PREG(ICDR);
 158        DTADR(si->rxdma) = si->dma_rx_buff_phy;
 159        DCMD(si->rxdma) = DCMD_INCTRGADDR | DCMD_FLOWSRC |  DCMD_WIDTH1 | DCMD_BURST32 | IRDA_FRAME_SIZE_LIMIT;
 160        DCSR(si->rxdma) |= DCSR_RUN;
 161}
 162
 163inline static void pxa_irda_fir_dma_tx_start(struct pxa_irda *si)
 164{
 165        DCSR(si->txdma)  = DCSR_NODESC;
 166        DSADR(si->txdma) = si->dma_tx_buff_phy;
 167        DTADR(si->txdma) = __PREG(ICDR);
 168        DCMD(si->txdma) = DCMD_INCSRCADDR | DCMD_FLOWTRG |  DCMD_ENDIRQEN | DCMD_WIDTH1 | DCMD_BURST32 | si->dma_tx_buff_len;
 169        DCSR(si->txdma) |= DCSR_RUN;
 170}
 171
 172/*
 173 * Set the IrDA communications mode.
 174 */
 175static void pxa_irda_set_mode(struct pxa_irda *si, int mode)
 176{
 177        if (si->pdata->transceiver_mode)
 178                si->pdata->transceiver_mode(si->dev, mode);
 179        else {
 180                if (gpio_is_valid(si->pdata->gpio_pwdown))
 181                        gpio_set_value(si->pdata->gpio_pwdown,
 182                                        !(mode & IR_OFF) ^
 183                                        !si->pdata->gpio_pwdown_inverted);
 184                pxa2xx_transceiver_mode(si->dev, mode);
 185        }
 186}
 187
 188/*
 189 * Set the IrDA communications speed.
 190 */
 191static int pxa_irda_set_speed(struct pxa_irda *si, int speed)
 192{
 193        unsigned long flags;
 194        unsigned int divisor;
 195
 196        switch (speed) {
 197        case 9600:      case 19200:     case 38400:
 198        case 57600:     case 115200:
 199
 200                /* refer to PXA250/210 Developer's Manual 10-7 */
 201                /*  BaudRate = 14.7456 MHz / (16*Divisor) */
 202                divisor = 14745600 / (16 * speed);
 203
 204                local_irq_save(flags);
 205
 206                if (IS_FIR(si)) {
 207                        /* stop RX DMA */
 208                        DCSR(si->rxdma) &= ~DCSR_RUN;
 209                        /* disable FICP */
 210                        ICCR0 = 0;
 211                        pxa_irda_disable_clk(si);
 212
 213                        /* set board transceiver to SIR mode */
 214                        pxa_irda_set_mode(si, IR_SIRMODE);
 215
 216                        /* enable the STUART clock */
 217                        pxa_irda_enable_sirclk(si);
 218                }
 219
 220                /* disable STUART first */
 221                STIER = 0;
 222
 223                /* access DLL & DLH */
 224                STLCR |= LCR_DLAB;
 225                STDLL = divisor & 0xff;
 226                STDLH = divisor >> 8;
 227                STLCR &= ~LCR_DLAB;
 228
 229                si->speed = speed;
 230                STISR = IrSR_IR_RECEIVE_ON | IrSR_XMODE_PULSE_1_6;
 231                STIER = IER_UUE | IER_RLSE | IER_RAVIE | IER_RTIOE;
 232
 233                local_irq_restore(flags);
 234                break;
 235
 236        case 4000000:
 237                local_irq_save(flags);
 238
 239                /* disable STUART */
 240                STIER = 0;
 241                STISR = 0;
 242                pxa_irda_disable_clk(si);
 243
 244                /* disable FICP first */
 245                ICCR0 = 0;
 246
 247                /* set board transceiver to FIR mode */
 248                pxa_irda_set_mode(si, IR_FIRMODE);
 249
 250                /* enable the FICP clock */
 251                pxa_irda_enable_firclk(si);
 252
 253                si->speed = speed;
 254                pxa_irda_fir_dma_rx_start(si);
 255                ICCR0 = ICCR0_ITR | ICCR0_RXE;
 256
 257                local_irq_restore(flags);
 258                break;
 259
 260        default:
 261                return -EINVAL;
 262        }
 263
 264        return 0;
 265}
 266
 267/* SIR interrupt service routine. */
 268static irqreturn_t pxa_irda_sir_irq(int irq, void *dev_id)
 269{
 270        struct net_device *dev = dev_id;
 271        struct pxa_irda *si = netdev_priv(dev);
 272        int iir, lsr, data;
 273
 274        iir = STIIR;
 275
 276        switch  (iir & 0x0F) {
 277        case 0x06: /* Receiver Line Status */
 278                lsr = STLSR;
 279                while (lsr & LSR_FIFOE) {
 280                        data = STRBR;
 281                        if (lsr & (LSR_OE | LSR_PE | LSR_FE | LSR_BI)) {
 282                                printk(KERN_DEBUG "pxa_ir: sir receiving error\n");
 283                                dev->stats.rx_errors++;
 284                                if (lsr & LSR_FE)
 285                                        dev->stats.rx_frame_errors++;
 286                                if (lsr & LSR_OE)
 287                                        dev->stats.rx_fifo_errors++;
 288                        } else {
 289                                dev->stats.rx_bytes++;
 290                                async_unwrap_char(dev, &dev->stats,
 291                                                  &si->rx_buff, data);
 292                        }
 293                        lsr = STLSR;
 294                }
 295                si->last_oscr = readl_relaxed(OSCR);
 296                break;
 297
 298        case 0x04: /* Received Data Available */
 299                   /* forth through */
 300
 301        case 0x0C: /* Character Timeout Indication */
 302                do  {
 303                    dev->stats.rx_bytes++;
 304                    async_unwrap_char(dev, &dev->stats, &si->rx_buff, STRBR);
 305                } while (STLSR & LSR_DR);
 306                si->last_oscr = readl_relaxed(OSCR);
 307                break;
 308
 309        case 0x02: /* Transmit FIFO Data Request */
 310                while ((si->tx_buff.len) && (STLSR & LSR_TDRQ)) {
 311                        STTHR = *si->tx_buff.data++;
 312                        si->tx_buff.len -= 1;
 313                }
 314
 315                if (si->tx_buff.len == 0) {
 316                        dev->stats.tx_packets++;
 317                        dev->stats.tx_bytes += si->tx_buff.data - si->tx_buff.head;
 318
 319                        /* We need to ensure that the transmitter has finished. */
 320                        while ((STLSR & LSR_TEMT) == 0)
 321                                cpu_relax();
 322                        si->last_oscr = readl_relaxed(OSCR);
 323
 324                        /*
 325                        * Ok, we've finished transmitting.  Now enable
 326                        * the receiver.  Sometimes we get a receive IRQ
 327                        * immediately after a transmit...
 328                        */
 329                        if (si->newspeed) {
 330                                pxa_irda_set_speed(si, si->newspeed);
 331                                si->newspeed = 0;
 332                        } else {
 333                                /* enable IR Receiver, disable IR Transmitter */
 334                                STISR = IrSR_IR_RECEIVE_ON | IrSR_XMODE_PULSE_1_6;
 335                                /* enable STUART and receive interrupts */
 336                                STIER = IER_UUE | IER_RLSE | IER_RAVIE | IER_RTIOE;
 337                        }
 338                        /* I'm hungry! */
 339                        netif_wake_queue(dev);
 340                }
 341                break;
 342        }
 343
 344        return IRQ_HANDLED;
 345}
 346
 347/* FIR Receive DMA interrupt handler */
 348static void pxa_irda_fir_dma_rx_irq(int channel, void *data)
 349{
 350        int dcsr = DCSR(channel);
 351
 352        DCSR(channel) = dcsr & ~DCSR_RUN;
 353
 354        printk(KERN_DEBUG "pxa_ir: fir rx dma bus error %#x\n", dcsr);
 355}
 356
 357/* FIR Transmit DMA interrupt handler */
 358static void pxa_irda_fir_dma_tx_irq(int channel, void *data)
 359{
 360        struct net_device *dev = data;
 361        struct pxa_irda *si = netdev_priv(dev);
 362        int dcsr;
 363
 364        dcsr = DCSR(channel);
 365        DCSR(channel) = dcsr & ~DCSR_RUN;
 366
 367        if (dcsr & DCSR_ENDINTR)  {
 368                dev->stats.tx_packets++;
 369                dev->stats.tx_bytes += si->dma_tx_buff_len;
 370        } else {
 371                dev->stats.tx_errors++;
 372        }
 373
 374        while (ICSR1 & ICSR1_TBY)
 375                cpu_relax();
 376        si->last_oscr = readl_relaxed(OSCR);
 377
 378        /*
 379         * HACK: It looks like the TBY bit is dropped too soon.
 380         * Without this delay things break.
 381         */
 382        udelay(120);
 383
 384        if (si->newspeed) {
 385                pxa_irda_set_speed(si, si->newspeed);
 386                si->newspeed = 0;
 387        } else {
 388                int i = 64;
 389
 390                ICCR0 = 0;
 391                pxa_irda_fir_dma_rx_start(si);
 392                while ((ICSR1 & ICSR1_RNE) && i--)
 393                        (void)ICDR;
 394                ICCR0 = ICCR0_ITR | ICCR0_RXE;
 395
 396                if (i < 0)
 397                        printk(KERN_ERR "pxa_ir: cannot clear Rx FIFO!\n");
 398        }
 399        netif_wake_queue(dev);
 400}
 401
 402/* EIF(Error in FIFO/End in Frame) handler for FIR */
 403static void pxa_irda_fir_irq_eif(struct pxa_irda *si, struct net_device *dev, int icsr0)
 404{
 405        unsigned int len, stat, data;
 406
 407        /* Get the current data position. */
 408        len = DTADR(si->rxdma) - si->dma_rx_buff_phy;
 409
 410        do {
 411                /* Read Status, and then Data.   */
 412                stat = ICSR1;
 413                rmb();
 414                data = ICDR;
 415
 416                if (stat & (ICSR1_CRE | ICSR1_ROR)) {
 417                        dev->stats.rx_errors++;
 418                        if (stat & ICSR1_CRE) {
 419                                printk(KERN_DEBUG "pxa_ir: fir receive CRC error\n");
 420                                dev->stats.rx_crc_errors++;
 421                        }
 422                        if (stat & ICSR1_ROR) {
 423                                printk(KERN_DEBUG "pxa_ir: fir receive overrun\n");
 424                                dev->stats.rx_over_errors++;
 425                        }
 426                } else  {
 427                        si->dma_rx_buff[len++] = data;
 428                }
 429                /* If we hit the end of frame, there's no point in continuing. */
 430                if (stat & ICSR1_EOF)
 431                        break;
 432        } while (ICSR0 & ICSR0_EIF);
 433
 434        if (stat & ICSR1_EOF) {
 435                /* end of frame. */
 436                struct sk_buff *skb;
 437
 438                if (icsr0 & ICSR0_FRE) {
 439                        printk(KERN_ERR "pxa_ir: dropping erroneous frame\n");
 440                        dev->stats.rx_dropped++;
 441                        return;
 442                }
 443
 444                skb = alloc_skb(len+1,GFP_ATOMIC);
 445                if (!skb)  {
 446                        printk(KERN_ERR "pxa_ir: fir out of memory for receive skb\n");
 447                        dev->stats.rx_dropped++;
 448                        return;
 449                }
 450
 451                /* Align IP header to 20 bytes  */
 452                skb_reserve(skb, 1);
 453                skb_copy_to_linear_data(skb, si->dma_rx_buff, len);
 454                skb_put(skb, len);
 455
 456                /* Feed it to IrLAP  */
 457                skb->dev = dev;
 458                skb_reset_mac_header(skb);
 459                skb->protocol = htons(ETH_P_IRDA);
 460                netif_rx(skb);
 461
 462                dev->stats.rx_packets++;
 463                dev->stats.rx_bytes += len;
 464        }
 465}
 466
 467/* FIR interrupt handler */
 468static irqreturn_t pxa_irda_fir_irq(int irq, void *dev_id)
 469{
 470        struct net_device *dev = dev_id;
 471        struct pxa_irda *si = netdev_priv(dev);
 472        int icsr0, i = 64;
 473
 474        /* stop RX DMA */
 475        DCSR(si->rxdma) &= ~DCSR_RUN;
 476        si->last_oscr = readl_relaxed(OSCR);
 477        icsr0 = ICSR0;
 478
 479        if (icsr0 & (ICSR0_FRE | ICSR0_RAB)) {
 480                if (icsr0 & ICSR0_FRE) {
 481                        printk(KERN_DEBUG "pxa_ir: fir receive frame error\n");
 482                        dev->stats.rx_frame_errors++;
 483                } else {
 484                        printk(KERN_DEBUG "pxa_ir: fir receive abort\n");
 485                        dev->stats.rx_errors++;
 486                }
 487                ICSR0 = icsr0 & (ICSR0_FRE | ICSR0_RAB);
 488        }
 489
 490        if (icsr0 & ICSR0_EIF) {
 491                /* An error in FIFO occurred, or there is a end of frame */
 492                pxa_irda_fir_irq_eif(si, dev, icsr0);
 493        }
 494
 495        ICCR0 = 0;
 496        pxa_irda_fir_dma_rx_start(si);
 497        while ((ICSR1 & ICSR1_RNE) && i--)
 498                (void)ICDR;
 499        ICCR0 = ICCR0_ITR | ICCR0_RXE;
 500
 501        if (i < 0)
 502                printk(KERN_ERR "pxa_ir: cannot clear Rx FIFO!\n");
 503
 504        return IRQ_HANDLED;
 505}
 506
 507/* hard_xmit interface of irda device */
 508static int pxa_irda_hard_xmit(struct sk_buff *skb, struct net_device *dev)
 509{
 510        struct pxa_irda *si = netdev_priv(dev);
 511        int speed = irda_get_next_speed(skb);
 512
 513        /*
 514         * Does this packet contain a request to change the interface
 515         * speed?  If so, remember it until we complete the transmission
 516         * of this frame.
 517         */
 518        if (speed != si->speed && speed != -1)
 519                si->newspeed = speed;
 520
 521        /*
 522         * If this is an empty frame, we can bypass a lot.
 523         */
 524        if (skb->len == 0) {
 525                if (si->newspeed) {
 526                        si->newspeed = 0;
 527                        pxa_irda_set_speed(si, speed);
 528                }
 529                dev_kfree_skb(skb);
 530                return NETDEV_TX_OK;
 531        }
 532
 533        netif_stop_queue(dev);
 534
 535        if (!IS_FIR(si)) {
 536                si->tx_buff.data = si->tx_buff.head;
 537                si->tx_buff.len  = async_wrap_skb(skb, si->tx_buff.data, si->tx_buff.truesize);
 538
 539                /* Disable STUART interrupts and switch to transmit mode. */
 540                STIER = 0;
 541                STISR = IrSR_IR_TRANSMIT_ON | IrSR_XMODE_PULSE_1_6;
 542
 543                /* enable STUART and transmit interrupts */
 544                STIER = IER_UUE | IER_TIE;
 545        } else {
 546                unsigned long mtt = irda_get_mtt(skb);
 547
 548                si->dma_tx_buff_len = skb->len;
 549                skb_copy_from_linear_data(skb, si->dma_tx_buff, skb->len);
 550
 551                if (mtt)
 552                        while ((unsigned)(readl_relaxed(OSCR) - si->last_oscr)/4 < mtt)
 553                                cpu_relax();
 554
 555                /* stop RX DMA,  disable FICP */
 556                DCSR(si->rxdma) &= ~DCSR_RUN;
 557                ICCR0 = 0;
 558
 559                pxa_irda_fir_dma_tx_start(si);
 560                ICCR0 = ICCR0_ITR | ICCR0_TXE;
 561        }
 562
 563        dev_kfree_skb(skb);
 564        return NETDEV_TX_OK;
 565}
 566
 567static int pxa_irda_ioctl(struct net_device *dev, struct ifreq *ifreq, int cmd)
 568{
 569        struct if_irda_req *rq = (struct if_irda_req *)ifreq;
 570        struct pxa_irda *si = netdev_priv(dev);
 571        int ret;
 572
 573        switch (cmd) {
 574        case SIOCSBANDWIDTH:
 575                ret = -EPERM;
 576                if (capable(CAP_NET_ADMIN)) {
 577                        /*
 578                         * We are unable to set the speed if the
 579                         * device is not running.
 580                         */
 581                        if (netif_running(dev)) {
 582                                ret = pxa_irda_set_speed(si,
 583                                                rq->ifr_baudrate);
 584                        } else {
 585                                printk(KERN_INFO "pxa_ir: SIOCSBANDWIDTH: !netif_running\n");
 586                                ret = 0;
 587                        }
 588                }
 589                break;
 590
 591        case SIOCSMEDIABUSY:
 592                ret = -EPERM;
 593                if (capable(CAP_NET_ADMIN)) {
 594                        irda_device_set_media_busy(dev, TRUE);
 595                        ret = 0;
 596                }
 597                break;
 598
 599        case SIOCGRECEIVING:
 600                ret = 0;
 601                rq->ifr_receiving = IS_FIR(si) ? 0
 602                                        : si->rx_buff.state != OUTSIDE_FRAME;
 603                break;
 604
 605        default:
 606                ret = -EOPNOTSUPP;
 607                break;
 608        }
 609
 610        return ret;
 611}
 612
 613static void pxa_irda_startup(struct pxa_irda *si)
 614{
 615        /* Disable STUART interrupts */
 616        STIER = 0;
 617        /* enable STUART interrupt to the processor */
 618        STMCR = MCR_OUT2;
 619        /* configure SIR frame format: StartBit - Data 7 ... Data 0 - Stop Bit */
 620        STLCR = LCR_WLS0 | LCR_WLS1;
 621        /* enable FIFO, we use FIFO to improve performance */
 622        STFCR = FCR_TRFIFOE | FCR_ITL_32;
 623
 624        /* disable FICP */
 625        ICCR0 = 0;
 626        /* configure FICP ICCR2 */
 627        ICCR2 = ICCR2_TXP | ICCR2_TRIG_32;
 628
 629        /* configure DMAC */
 630        DRCMR(17) = si->rxdma | DRCMR_MAPVLD;
 631        DRCMR(18) = si->txdma | DRCMR_MAPVLD;
 632
 633        /* force SIR reinitialization */
 634        si->speed = 4000000;
 635        pxa_irda_set_speed(si, 9600);
 636
 637        printk(KERN_DEBUG "pxa_ir: irda startup\n");
 638}
 639
 640static void pxa_irda_shutdown(struct pxa_irda *si)
 641{
 642        unsigned long flags;
 643
 644        local_irq_save(flags);
 645
 646        /* disable STUART and interrupt */
 647        STIER = 0;
 648        /* disable STUART SIR mode */
 649        STISR = 0;
 650
 651        /* disable DMA */
 652        DCSR(si->txdma) &= ~DCSR_RUN;
 653        DCSR(si->rxdma) &= ~DCSR_RUN;
 654        /* disable FICP */
 655        ICCR0 = 0;
 656
 657        /* disable the STUART or FICP clocks */
 658        pxa_irda_disable_clk(si);
 659
 660        DRCMR(17) = 0;
 661        DRCMR(18) = 0;
 662
 663        local_irq_restore(flags);
 664
 665        /* power off board transceiver */
 666        pxa_irda_set_mode(si, IR_OFF);
 667
 668        printk(KERN_DEBUG "pxa_ir: irda shutdown\n");
 669}
 670
 671static int pxa_irda_start(struct net_device *dev)
 672{
 673        struct pxa_irda *si = netdev_priv(dev);
 674        int err;
 675
 676        si->speed = 9600;
 677
 678        err = request_irq(si->uart_irq, pxa_irda_sir_irq, 0, dev->name, dev);
 679        if (err)
 680                goto err_irq1;
 681
 682        err = request_irq(si->icp_irq, pxa_irda_fir_irq, 0, dev->name, dev);
 683        if (err)
 684                goto err_irq2;
 685
 686        /*
 687         * The interrupt must remain disabled for now.
 688         */
 689        disable_irq(si->uart_irq);
 690        disable_irq(si->icp_irq);
 691
 692        err = -EBUSY;
 693        si->rxdma = pxa_request_dma("FICP_RX",DMA_PRIO_LOW, pxa_irda_fir_dma_rx_irq, dev);
 694        if (si->rxdma < 0)
 695                goto err_rx_dma;
 696
 697        si->txdma = pxa_request_dma("FICP_TX",DMA_PRIO_LOW, pxa_irda_fir_dma_tx_irq, dev);
 698        if (si->txdma < 0)
 699                goto err_tx_dma;
 700
 701        err = -ENOMEM;
 702        si->dma_rx_buff = dma_alloc_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT,
 703                                             &si->dma_rx_buff_phy, GFP_KERNEL);
 704        if (!si->dma_rx_buff)
 705                goto err_dma_rx_buff;
 706
 707        si->dma_tx_buff = dma_alloc_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT,
 708                                             &si->dma_tx_buff_phy, GFP_KERNEL);
 709        if (!si->dma_tx_buff)
 710                goto err_dma_tx_buff;
 711
 712        /* Setup the serial port for the initial speed. */
 713        pxa_irda_startup(si);
 714
 715        /*
 716         * Open a new IrLAP layer instance.
 717         */
 718        si->irlap = irlap_open(dev, &si->qos, "pxa");
 719        err = -ENOMEM;
 720        if (!si->irlap)
 721                goto err_irlap;
 722
 723        /*
 724         * Now enable the interrupt and start the queue
 725         */
 726        enable_irq(si->uart_irq);
 727        enable_irq(si->icp_irq);
 728        netif_start_queue(dev);
 729
 730        printk(KERN_DEBUG "pxa_ir: irda driver opened\n");
 731
 732        return 0;
 733
 734err_irlap:
 735        pxa_irda_shutdown(si);
 736        dma_free_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT, si->dma_tx_buff, si->dma_tx_buff_phy);
 737err_dma_tx_buff:
 738        dma_free_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT, si->dma_rx_buff, si->dma_rx_buff_phy);
 739err_dma_rx_buff:
 740        pxa_free_dma(si->txdma);
 741err_tx_dma:
 742        pxa_free_dma(si->rxdma);
 743err_rx_dma:
 744        free_irq(si->icp_irq, dev);
 745err_irq2:
 746        free_irq(si->uart_irq, dev);
 747err_irq1:
 748
 749        return err;
 750}
 751
 752static int pxa_irda_stop(struct net_device *dev)
 753{
 754        struct pxa_irda *si = netdev_priv(dev);
 755
 756        netif_stop_queue(dev);
 757
 758        pxa_irda_shutdown(si);
 759
 760        /* Stop IrLAP */
 761        if (si->irlap) {
 762                irlap_close(si->irlap);
 763                si->irlap = NULL;
 764        }
 765
 766        free_irq(si->uart_irq, dev);
 767        free_irq(si->icp_irq, dev);
 768
 769        pxa_free_dma(si->rxdma);
 770        pxa_free_dma(si->txdma);
 771
 772        if (si->dma_rx_buff)
 773                dma_free_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT, si->dma_tx_buff, si->dma_tx_buff_phy);
 774        if (si->dma_tx_buff)
 775                dma_free_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT, si->dma_rx_buff, si->dma_rx_buff_phy);
 776
 777        printk(KERN_DEBUG "pxa_ir: irda driver closed\n");
 778        return 0;
 779}
 780
 781static int pxa_irda_suspend(struct platform_device *_dev, pm_message_t state)
 782{
 783        struct net_device *dev = platform_get_drvdata(_dev);
 784        struct pxa_irda *si;
 785
 786        if (dev && netif_running(dev)) {
 787                si = netdev_priv(dev);
 788                netif_device_detach(dev);
 789                pxa_irda_shutdown(si);
 790        }
 791
 792        return 0;
 793}
 794
 795static int pxa_irda_resume(struct platform_device *_dev)
 796{
 797        struct net_device *dev = platform_get_drvdata(_dev);
 798        struct pxa_irda *si;
 799
 800        if (dev && netif_running(dev)) {
 801                si = netdev_priv(dev);
 802                pxa_irda_startup(si);
 803                netif_device_attach(dev);
 804                netif_wake_queue(dev);
 805        }
 806
 807        return 0;
 808}
 809
 810
 811static int pxa_irda_init_iobuf(iobuff_t *io, int size)
 812{
 813        io->head = kmalloc(size, GFP_KERNEL | GFP_DMA);
 814        if (io->head != NULL) {
 815                io->truesize = size;
 816                io->in_frame = FALSE;
 817                io->state    = OUTSIDE_FRAME;
 818                io->data     = io->head;
 819        }
 820        return io->head ? 0 : -ENOMEM;
 821}
 822
 823static const struct net_device_ops pxa_irda_netdev_ops = {
 824        .ndo_open               = pxa_irda_start,
 825        .ndo_stop               = pxa_irda_stop,
 826        .ndo_start_xmit         = pxa_irda_hard_xmit,
 827        .ndo_do_ioctl           = pxa_irda_ioctl,
 828};
 829
 830static int pxa_irda_probe(struct platform_device *pdev)
 831{
 832        struct net_device *dev;
 833        struct pxa_irda *si;
 834        unsigned int baudrate_mask;
 835        int err;
 836
 837        if (!pdev->dev.platform_data)
 838                return -ENODEV;
 839
 840        err = request_mem_region(__PREG(STUART), 0x24, "IrDA") ? 0 : -EBUSY;
 841        if (err)
 842                goto err_mem_1;
 843
 844        err = request_mem_region(__PREG(FICP), 0x1c, "IrDA") ? 0 : -EBUSY;
 845        if (err)
 846                goto err_mem_2;
 847
 848        dev = alloc_irdadev(sizeof(struct pxa_irda));
 849        if (!dev) {
 850                err = -ENOMEM;
 851                goto err_mem_3;
 852        }
 853
 854        SET_NETDEV_DEV(dev, &pdev->dev);
 855        si = netdev_priv(dev);
 856        si->dev = &pdev->dev;
 857        si->pdata = pdev->dev.platform_data;
 858
 859        si->uart_irq = platform_get_irq(pdev, 0);
 860        si->icp_irq = platform_get_irq(pdev, 1);
 861
 862        si->sir_clk = clk_get(&pdev->dev, "UARTCLK");
 863        si->fir_clk = clk_get(&pdev->dev, "FICPCLK");
 864        if (IS_ERR(si->sir_clk) || IS_ERR(si->fir_clk)) {
 865                err = PTR_ERR(IS_ERR(si->sir_clk) ? si->sir_clk : si->fir_clk);
 866                goto err_mem_4;
 867        }
 868
 869        /*
 870         * Initialise the SIR buffers
 871         */
 872        err = pxa_irda_init_iobuf(&si->rx_buff, 14384);
 873        if (err)
 874                goto err_mem_4;
 875        err = pxa_irda_init_iobuf(&si->tx_buff, 4000);
 876        if (err)
 877                goto err_mem_5;
 878
 879        if (gpio_is_valid(si->pdata->gpio_pwdown)) {
 880                err = gpio_request(si->pdata->gpio_pwdown, "IrDA switch");
 881                if (err)
 882                        goto err_startup;
 883                err = gpio_direction_output(si->pdata->gpio_pwdown,
 884                                        !si->pdata->gpio_pwdown_inverted);
 885                if (err) {
 886                        gpio_free(si->pdata->gpio_pwdown);
 887                        goto err_startup;
 888                }
 889        }
 890
 891        if (si->pdata->startup) {
 892                err = si->pdata->startup(si->dev);
 893                if (err)
 894                        goto err_startup;
 895        }
 896
 897        if (gpio_is_valid(si->pdata->gpio_pwdown) && si->pdata->startup)
 898                dev_warn(si->dev, "gpio_pwdown and startup() both defined!\n");
 899
 900        dev->netdev_ops = &pxa_irda_netdev_ops;
 901
 902        irda_init_max_qos_capabilies(&si->qos);
 903
 904        baudrate_mask = 0;
 905        if (si->pdata->transceiver_cap & IR_SIRMODE)
 906                baudrate_mask |= IR_9600|IR_19200|IR_38400|IR_57600|IR_115200;
 907        if (si->pdata->transceiver_cap & IR_FIRMODE)
 908                baudrate_mask |= IR_4000000 << 8;
 909
 910        si->qos.baud_rate.bits &= baudrate_mask;
 911        si->qos.min_turn_time.bits = 7;  /* 1ms or more */
 912
 913        irda_qos_bits_to_value(&si->qos);
 914
 915        err = register_netdev(dev);
 916
 917        if (err == 0)
 918                dev_set_drvdata(&pdev->dev, dev);
 919
 920        if (err) {
 921                if (si->pdata->shutdown)
 922                        si->pdata->shutdown(si->dev);
 923err_startup:
 924                kfree(si->tx_buff.head);
 925err_mem_5:
 926                kfree(si->rx_buff.head);
 927err_mem_4:
 928                if (si->sir_clk && !IS_ERR(si->sir_clk))
 929                        clk_put(si->sir_clk);
 930                if (si->fir_clk && !IS_ERR(si->fir_clk))
 931                        clk_put(si->fir_clk);
 932                free_netdev(dev);
 933err_mem_3:
 934                release_mem_region(__PREG(FICP), 0x1c);
 935err_mem_2:
 936                release_mem_region(__PREG(STUART), 0x24);
 937        }
 938err_mem_1:
 939        return err;
 940}
 941
 942static int pxa_irda_remove(struct platform_device *_dev)
 943{
 944        struct net_device *dev = platform_get_drvdata(_dev);
 945
 946        if (dev) {
 947                struct pxa_irda *si = netdev_priv(dev);
 948                unregister_netdev(dev);
 949                if (gpio_is_valid(si->pdata->gpio_pwdown))
 950                        gpio_free(si->pdata->gpio_pwdown);
 951                if (si->pdata->shutdown)
 952                        si->pdata->shutdown(si->dev);
 953                kfree(si->tx_buff.head);
 954                kfree(si->rx_buff.head);
 955                clk_put(si->fir_clk);
 956                clk_put(si->sir_clk);
 957                free_netdev(dev);
 958        }
 959
 960        release_mem_region(__PREG(STUART), 0x24);
 961        release_mem_region(__PREG(FICP), 0x1c);
 962
 963        return 0;
 964}
 965
 966static struct platform_driver pxa_ir_driver = {
 967        .driver         = {
 968                .name   = "pxa2xx-ir",
 969                .owner  = THIS_MODULE,
 970        },
 971        .probe          = pxa_irda_probe,
 972        .remove         = pxa_irda_remove,
 973        .suspend        = pxa_irda_suspend,
 974        .resume         = pxa_irda_resume,
 975};
 976
 977module_platform_driver(pxa_ir_driver);
 978
 979MODULE_LICENSE("GPL");
 980MODULE_ALIAS("platform:pxa2xx-ir");
 981