[SK_BUFF]: Introduce skb_copy_from_linear_data{_offset}

[linux-2.6/openmoko-kernel/knife-kernel.git] / drivers / net / irda / pxaficp_ir.c

/*
 * linux/drivers/net/irda/pxaficp_ir.c
 *
 * Based on sa1100_ir.c by Russell King
 *
 * Changes copyright (C) 2003-2005 MontaVista Software, Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Infra-red driver (SIR/FIR) for the PXA2xx embedded microprocessor
 *
 */
#include <linux/module.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/netdevice.h>
#include <linux/slab.h>
#include <linux/rtnetlink.h>
#include <linux/interrupt.h>
#include <linux/dma-mapping.h>
#include <linux/platform_device.h>
#include <linux/pm.h>

#include <net/irda/irda.h>
#include <net/irda/irmod.h>
#include <net/irda/wrapper.h>
#include <net/irda/irda_device.h>

#include <asm/irq.h>
#include <asm/dma.h>
#include <asm/delay.h>
#include <asm/hardware.h>
#include <asm/arch/irda.h>
#include <asm/arch/pxa-regs.h>

#ifdef CONFIG_MACH_MAINSTONE
#include <asm/arch/mainstone.h>
#endif

#define IrSR_RXPL_NEG_IS_ZERO (1<<4)
#define IrSR_RXPL_POS_IS_ZERO 0x0
#define IrSR_TXPL_NEG_IS_ZERO (1<<3)
#define IrSR_TXPL_POS_IS_ZERO 0x0
#define IrSR_XMODE_PULSE_1_6  (1<<2)
#define IrSR_XMODE_PULSE_3_16 0x0
#define IrSR_RCVEIR_IR_MODE   (1<<1)
#define IrSR_RCVEIR_UART_MODE 0x0
#define IrSR_XMITIR_IR_MODE   (1<<0)
#define IrSR_XMITIR_UART_MODE 0x0

#define IrSR_IR_RECEIVE_ON (\
                IrSR_RXPL_NEG_IS_ZERO | \
                IrSR_TXPL_POS_IS_ZERO | \
                IrSR_XMODE_PULSE_3_16 | \
                IrSR_RCVEIR_IR_MODE   | \
                IrSR_XMITIR_UART_MODE)

#define IrSR_IR_TRANSMIT_ON (\
                IrSR_RXPL_NEG_IS_ZERO | \
                IrSR_TXPL_POS_IS_ZERO | \
                IrSR_XMODE_PULSE_3_16 | \
                IrSR_RCVEIR_UART_MODE | \
                IrSR_XMITIR_IR_MODE)

struct pxa_irda {
        int                     speed;
        int                     newspeed;
        unsigned long           last_oscr;

        unsigned char           *dma_rx_buff;
        unsigned char           *dma_tx_buff;
        dma_addr_t              dma_rx_buff_phy;
        dma_addr_t              dma_tx_buff_phy;
        unsigned int            dma_tx_buff_len;
        int                     txdma;
        int                     rxdma;

        struct net_device_stats stats;
        struct irlap_cb         *irlap;
        struct qos_info         qos;

        iobuff_t                tx_buff;
        iobuff_t                rx_buff;

        struct device           *dev;
        struct pxaficp_platform_data *pdata;
};


#define IS_FIR(si)              ((si)->speed >= 4000000)
#define IRDA_FRAME_SIZE_LIMIT   2047

inline static void pxa_irda_fir_dma_rx_start(struct pxa_irda *si)
{
        DCSR(si->rxdma)  = DCSR_NODESC;
        DSADR(si->rxdma) = __PREG(ICDR);
        DTADR(si->rxdma) = si->dma_rx_buff_phy;
        DCMD(si->rxdma) = DCMD_INCTRGADDR | DCMD_FLOWSRC |  DCMD_WIDTH1 | DCMD_BURST32 | IRDA_FRAME_SIZE_LIMIT;
        DCSR(si->rxdma) |= DCSR_RUN;
}

inline static void pxa_irda_fir_dma_tx_start(struct pxa_irda *si)
{
        DCSR(si->txdma)  = DCSR_NODESC;
        DSADR(si->txdma) = si->dma_tx_buff_phy;
        DTADR(si->txdma) = __PREG(ICDR);
        DCMD(si->txdma) = DCMD_INCSRCADDR | DCMD_FLOWTRG |  DCMD_ENDIRQEN | DCMD_WIDTH1 | DCMD_BURST32 | si->dma_tx_buff_len;
        DCSR(si->txdma) |= DCSR_RUN;
}

/*
 * Set the IrDA communications speed.
 */
static int pxa_irda_set_speed(struct pxa_irda *si, int speed)
{
        unsigned long flags;
        unsigned int divisor;

        switch (speed) {
        case 9600:      case 19200:     case 38400:
        case 57600:     case 115200:

                /* refer to PXA250/210 Developer's Manual 10-7 */
                /*  BaudRate = 14.7456 MHz / (16*Divisor) */
                divisor = 14745600 / (16 * speed);

                local_irq_save(flags);

                if (IS_FIR(si)) {
                        /* stop RX DMA */
                        DCSR(si->rxdma) &= ~DCSR_RUN;
                        /* disable FICP */
                        ICCR0 = 0;
                        pxa_set_cken(CKEN13_FICP, 0);

                        /* set board transceiver to SIR mode */
                        si->pdata->transceiver_mode(si->dev, IR_SIRMODE);

                        /* configure GPIO46/47 */
                        pxa_gpio_mode(GPIO46_STRXD_MD);
                        pxa_gpio_mode(GPIO47_STTXD_MD);

                        /* enable the STUART clock */
                        pxa_set_cken(CKEN5_STUART, 1);
                }

                /* disable STUART first */
                STIER = 0;

                /* access DLL & DLH */
                STLCR |= LCR_DLAB;
                STDLL = divisor & 0xff;
                STDLH = divisor >> 8;
                STLCR &= ~LCR_DLAB;

                si->speed = speed;
                STISR = IrSR_IR_RECEIVE_ON | IrSR_XMODE_PULSE_1_6;
                STIER = IER_UUE | IER_RLSE | IER_RAVIE | IER_RTIOE;

                local_irq_restore(flags);
                break;

        case 4000000:
                local_irq_save(flags);

                /* disable STUART */
                STIER = 0;
                STISR = 0;
                pxa_set_cken(CKEN5_STUART, 0);

                /* disable FICP first */
                ICCR0 = 0;

                /* set board transceiver to FIR mode */
                si->pdata->transceiver_mode(si->dev, IR_FIRMODE);

                /* configure GPIO46/47 */
                pxa_gpio_mode(GPIO46_ICPRXD_MD);
                pxa_gpio_mode(GPIO47_ICPTXD_MD);

                /* enable the FICP clock */
                pxa_set_cken(CKEN13_FICP, 1);

                si->speed = speed;
                pxa_irda_fir_dma_rx_start(si);
                ICCR0 = ICCR0_ITR | ICCR0_RXE;

                local_irq_restore(flags);
                break;

        default:
                return -EINVAL;
        }

        return 0;
}

/* SIR interrupt service routine. */
static irqreturn_t pxa_irda_sir_irq(int irq, void *dev_id)
{
        struct net_device *dev = dev_id;
        struct pxa_irda *si = netdev_priv(dev);
        int iir, lsr, data;

        iir = STIIR;

        switch  (iir & 0x0F) {
        case 0x06: /* Receiver Line Status */
                lsr = STLSR;
                while (lsr & LSR_FIFOE) {
                        data = STRBR;
                        if (lsr & (LSR_OE | LSR_PE | LSR_FE | LSR_BI)) {
                                printk(KERN_DEBUG "pxa_ir: sir receiving error\n");
                                si->stats.rx_errors++;
                                if (lsr & LSR_FE)
                                        si->stats.rx_frame_errors++;
                                if (lsr & LSR_OE)
                                        si->stats.rx_fifo_errors++;
                        } else {
                                si->stats.rx_bytes++;
                                async_unwrap_char(dev, &si->stats, &si->rx_buff, data);
                        }
                        lsr = STLSR;
                }
                dev->last_rx = jiffies;
                si->last_oscr = OSCR;
                break;

        case 0x04: /* Received Data Available */
                   /* forth through */

        case 0x0C: /* Character Timeout Indication */
                do  {
                    si->stats.rx_bytes++;
                    async_unwrap_char(dev, &si->stats, &si->rx_buff, STRBR);
                } while (STLSR & LSR_DR);
                dev->last_rx = jiffies;
                si->last_oscr = OSCR;
                break;

        case 0x02: /* Transmit FIFO Data Request */
                while ((si->tx_buff.len) && (STLSR & LSR_TDRQ)) {
                        STTHR = *si->tx_buff.data++;
                        si->tx_buff.len -= 1;
                }

                if (si->tx_buff.len == 0) {
                        si->stats.tx_packets++;
                        si->stats.tx_bytes += si->tx_buff.data -
                                              si->tx_buff.head;

                        /* We need to ensure that the transmitter has finished. */
                        while ((STLSR & LSR_TEMT) == 0)
                                cpu_relax();
                        si->last_oscr = OSCR;

                        /*
                        * Ok, we've finished transmitting.  Now enable
                        * the receiver.  Sometimes we get a receive IRQ
                        * immediately after a transmit...
                        */
                        if (si->newspeed) {
                                pxa_irda_set_speed(si, si->newspeed);
                                si->newspeed = 0;
                        } else {
                                /* enable IR Receiver, disable IR Transmitter */
                                STISR = IrSR_IR_RECEIVE_ON | IrSR_XMODE_PULSE_1_6;
                                /* enable STUART and receive interrupts */
                                STIER = IER_UUE | IER_RLSE | IER_RAVIE | IER_RTIOE;
                        }
                        /* I'm hungry! */
                        netif_wake_queue(dev);
                }
                break;
        }

        return IRQ_HANDLED;
}

/* FIR Receive DMA interrupt handler */
static void pxa_irda_fir_dma_rx_irq(int channel, void *data)
{
        int dcsr = DCSR(channel);

        DCSR(channel) = dcsr & ~DCSR_RUN;

        printk(KERN_DEBUG "pxa_ir: fir rx dma bus error %#x\n", dcsr);
}

/* FIR Transmit DMA interrupt handler */
static void pxa_irda_fir_dma_tx_irq(int channel, void *data)
{
        struct net_device *dev = data;
        struct pxa_irda *si = netdev_priv(dev);
        int dcsr;

        dcsr = DCSR(channel);
        DCSR(channel) = dcsr & ~DCSR_RUN;

        if (dcsr & DCSR_ENDINTR)  {
                si->stats.tx_packets++;
                si->stats.tx_bytes += si->dma_tx_buff_len;
        } else {
                si->stats.tx_errors++;
        }

        while (ICSR1 & ICSR1_TBY)
                cpu_relax();
        si->last_oscr = OSCR;

        /*
         * HACK: It looks like the TBY bit is dropped too soon.
         * Without this delay things break.
         */
        udelay(120);

        if (si->newspeed) {
                pxa_irda_set_speed(si, si->newspeed);
                si->newspeed = 0;
        } else {
                int i = 64;

                ICCR0 = 0;
                pxa_irda_fir_dma_rx_start(si);
                while ((ICSR1 & ICSR1_RNE) && i--)
                        (void)ICDR;
                ICCR0 = ICCR0_ITR | ICCR0_RXE;

                if (i < 0)
                        printk(KERN_ERR "pxa_ir: cannot clear Rx FIFO!\n");
        }
        netif_wake_queue(dev);
}

/* EIF(Error in FIFO/End in Frame) handler for FIR */
static void pxa_irda_fir_irq_eif(struct pxa_irda *si, struct net_device *dev, int icsr0)
{
        unsigned int len, stat, data;

        /* Get the current data position. */
        len = DTADR(si->rxdma) - si->dma_rx_buff_phy;

        do {
                /* Read Status, and then Data.   */
                stat = ICSR1;
                rmb();
                data = ICDR;

                if (stat & (ICSR1_CRE | ICSR1_ROR)) {
                        si->stats.rx_errors++;
                        if (stat & ICSR1_CRE) {
                                printk(KERN_DEBUG "pxa_ir: fir receive CRC error\n");
                                si->stats.rx_crc_errors++;
                        }
                        if (stat & ICSR1_ROR) {
                                printk(KERN_DEBUG "pxa_ir: fir receive overrun\n");
                                si->stats.rx_over_errors++;
                        }
                } else  {
                        si->dma_rx_buff[len++] = data;
                }
                /* If we hit the end of frame, there's no point in continuing. */
                if (stat & ICSR1_EOF)
                        break;
        } while (ICSR0 & ICSR0_EIF);

        if (stat & ICSR1_EOF) {
                /* end of frame. */
                struct sk_buff *skb;

                if (icsr0 & ICSR0_FRE) {
                        printk(KERN_ERR "pxa_ir: dropping erroneous frame\n");
                        si->stats.rx_dropped++;
                        return;
                }

                skb = alloc_skb(len+1,GFP_ATOMIC);
                if (!skb)  {
                        printk(KERN_ERR "pxa_ir: fir out of memory for receive skb\n");
                        si->stats.rx_dropped++;
                        return;
                }

                /* Align IP header to 20 bytes  */
                skb_reserve(skb, 1);
                memcpy(skb->data, si->dma_rx_buff, len);
                skb_put(skb, len);

                /* Feed it to IrLAP  */
                skb->dev = dev;
                skb_reset_mac_header(skb);
                skb->protocol = htons(ETH_P_IRDA);
                netif_rx(skb);

                si->stats.rx_packets++;
                si->stats.rx_bytes += len;

                dev->last_rx = jiffies;
        }
}

/* FIR interrupt handler */
static irqreturn_t pxa_irda_fir_irq(int irq, void *dev_id)
{
        struct net_device *dev = dev_id;
        struct pxa_irda *si = netdev_priv(dev);
        int icsr0, i = 64;

        /* stop RX DMA */
        DCSR(si->rxdma) &= ~DCSR_RUN;
        si->last_oscr = OSCR;
        icsr0 = ICSR0;

        if (icsr0 & (ICSR0_FRE | ICSR0_RAB)) {
                if (icsr0 & ICSR0_FRE) {
                        printk(KERN_DEBUG "pxa_ir: fir receive frame error\n");
                        si->stats.rx_frame_errors++;
                } else {
                        printk(KERN_DEBUG "pxa_ir: fir receive abort\n");
                        si->stats.rx_errors++;
                }
                ICSR0 = icsr0 & (ICSR0_FRE | ICSR0_RAB);
        }

        if (icsr0 & ICSR0_EIF) {
                /* An error in FIFO occured, or there is a end of frame */
                pxa_irda_fir_irq_eif(si, dev, icsr0);
        }

        ICCR0 = 0;
        pxa_irda_fir_dma_rx_start(si);
        while ((ICSR1 & ICSR1_RNE) && i--)
                (void)ICDR;
        ICCR0 = ICCR0_ITR | ICCR0_RXE;

        if (i < 0)
                printk(KERN_ERR "pxa_ir: cannot clear Rx FIFO!\n");

        return IRQ_HANDLED;
}

/* hard_xmit interface of irda device */
static int pxa_irda_hard_xmit(struct sk_buff *skb, struct net_device *dev)
{
        struct pxa_irda *si = netdev_priv(dev);
        int speed = irda_get_next_speed(skb);

        /*
         * Does this packet contain a request to change the interface
         * speed?  If so, remember it until we complete the transmission
         * of this frame.
         */
        if (speed != si->speed && speed != -1)
                si->newspeed = speed;

        /*
         * If this is an empty frame, we can bypass a lot.
         */
        if (skb->len == 0) {
                if (si->newspeed) {
                        si->newspeed = 0;
                        pxa_irda_set_speed(si, speed);
                }
                dev_kfree_skb(skb);
                return 0;
        }

        netif_stop_queue(dev);

        if (!IS_FIR(si)) {
                si->tx_buff.data = si->tx_buff.head;
                si->tx_buff.len  = async_wrap_skb(skb, si->tx_buff.data, si->tx_buff.truesize);

                /* Disable STUART interrupts and switch to transmit mode. */
                STIER = 0;
                STISR = IrSR_IR_TRANSMIT_ON | IrSR_XMODE_PULSE_1_6;

                /* enable STUART and transmit interrupts */
                STIER = IER_UUE | IER_TIE;
        } else {
                unsigned long mtt = irda_get_mtt(skb);

                si->dma_tx_buff_len = skb->len;
                skb_copy_from_linear_data(skb, si->dma_tx_buff, skb->len);

                if (mtt)
                        while ((unsigned)(OSCR - si->last_oscr)/4 < mtt)
                                cpu_relax();

                /* stop RX DMA,  disable FICP */
                DCSR(si->rxdma) &= ~DCSR_RUN;
                ICCR0 = 0;

                pxa_irda_fir_dma_tx_start(si);
                ICCR0 = ICCR0_ITR | ICCR0_TXE;
        }

        dev_kfree_skb(skb);
        dev->trans_start = jiffies;
        return 0;
}

static int pxa_irda_ioctl(struct net_device *dev, struct ifreq *ifreq, int cmd)
{
        struct if_irda_req *rq = (struct if_irda_req *)ifreq;
        struct pxa_irda *si = netdev_priv(dev);
        int ret;

        switch (cmd) {
        case SIOCSBANDWIDTH:
                ret = -EPERM;
                if (capable(CAP_NET_ADMIN)) {
                        /*
                         * We are unable to set the speed if the
                         * device is not running.
                         */
                        if (netif_running(dev)) {
                                ret = pxa_irda_set_speed(si,
                                                rq->ifr_baudrate);
                        } else {
                                printk(KERN_INFO "pxa_ir: SIOCSBANDWIDTH: !netif_running\n");
                                ret = 0;
                        }
                }
                break;

        case SIOCSMEDIABUSY:
                ret = -EPERM;
                if (capable(CAP_NET_ADMIN)) {
                        irda_device_set_media_busy(dev, TRUE);
                        ret = 0;
                }
                break;

        case SIOCGRECEIVING:
                ret = 0;
                rq->ifr_receiving = IS_FIR(si) ? 0
                                        : si->rx_buff.state != OUTSIDE_FRAME;
                break;

        default:
                ret = -EOPNOTSUPP;
                break;
        }

        return ret;
}

static struct net_device_stats *pxa_irda_stats(struct net_device *dev)
{
        struct pxa_irda *si = netdev_priv(dev);
        return &si->stats;
}

static void pxa_irda_startup(struct pxa_irda *si)
{
        /* Disable STUART interrupts */
        STIER = 0;
        /* enable STUART interrupt to the processor */
        STMCR = MCR_OUT2;
        /* configure SIR frame format: StartBit - Data 7 ... Data 0 - Stop Bit */
        STLCR = LCR_WLS0 | LCR_WLS1;
        /* enable FIFO, we use FIFO to improve performance */
        STFCR = FCR_TRFIFOE | FCR_ITL_32;

        /* disable FICP */
        ICCR0 = 0;
        /* configure FICP ICCR2 */
        ICCR2 = ICCR2_TXP | ICCR2_TRIG_32;

        /* configure DMAC */
        DRCMR17 = si->rxdma | DRCMR_MAPVLD;
        DRCMR18 = si->txdma | DRCMR_MAPVLD;

        /* force SIR reinitialization */
        si->speed = 4000000;
        pxa_irda_set_speed(si, 9600);

        printk(KERN_DEBUG "pxa_ir: irda startup\n");
}

static void pxa_irda_shutdown(struct pxa_irda *si)
{
        unsigned long flags;

        local_irq_save(flags);

        /* disable STUART and interrupt */
        STIER = 0;
        /* disable STUART SIR mode */
        STISR = 0;
        /* disable the STUART clock */
        pxa_set_cken(CKEN5_STUART, 0);

        /* disable DMA */
        DCSR(si->txdma) &= ~DCSR_RUN;
        DCSR(si->rxdma) &= ~DCSR_RUN;
        /* disable FICP */
        ICCR0 = 0;
        /* disable the FICP clock */
        pxa_set_cken(CKEN13_FICP, 0);

        DRCMR17 = 0;
        DRCMR18 = 0;

        local_irq_restore(flags);

        /* power off board transceiver */
        si->pdata->transceiver_mode(si->dev, IR_OFF);

        printk(KERN_DEBUG "pxa_ir: irda shutdown\n");
}

static int pxa_irda_start(struct net_device *dev)
{
        struct pxa_irda *si = netdev_priv(dev);
        int err;

        si->speed = 9600;

        err = request_irq(IRQ_STUART, pxa_irda_sir_irq, 0, dev->name, dev);
        if (err)
                goto err_irq1;

        err = request_irq(IRQ_ICP, pxa_irda_fir_irq, 0, dev->name, dev);
        if (err)
                goto err_irq2;

        /*
         * The interrupt must remain disabled for now.
         */
        disable_irq(IRQ_STUART);
        disable_irq(IRQ_ICP);

        err = -EBUSY;
        si->rxdma = pxa_request_dma("FICP_RX",DMA_PRIO_LOW, pxa_irda_fir_dma_rx_irq, dev);
        if (si->rxdma < 0)
                goto err_rx_dma;

        si->txdma = pxa_request_dma("FICP_TX",DMA_PRIO_LOW, pxa_irda_fir_dma_tx_irq, dev);
        if (si->txdma < 0)
                goto err_tx_dma;

        err = -ENOMEM;
        si->dma_rx_buff = dma_alloc_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT,
                                             &si->dma_rx_buff_phy, GFP_KERNEL );
        if (!si->dma_rx_buff)
                goto err_dma_rx_buff;

        si->dma_tx_buff = dma_alloc_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT,
                                             &si->dma_tx_buff_phy, GFP_KERNEL );
        if (!si->dma_tx_buff)
                goto err_dma_tx_buff;

        /* Setup the serial port for the initial speed. */
        pxa_irda_startup(si);

        /*
         * Open a new IrLAP layer instance.
         */
        si->irlap = irlap_open(dev, &si->qos, "pxa");
        err = -ENOMEM;
        if (!si->irlap)
                goto err_irlap;

        /*
         * Now enable the interrupt and start the queue
         */
        enable_irq(IRQ_STUART);
        enable_irq(IRQ_ICP);
        netif_start_queue(dev);

        printk(KERN_DEBUG "pxa_ir: irda driver opened\n");

        return 0;

err_irlap:
        pxa_irda_shutdown(si);
        dma_free_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT, si->dma_tx_buff, si->dma_tx_buff_phy);
err_dma_tx_buff:
        dma_free_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT, si->dma_rx_buff, si->dma_rx_buff_phy);
err_dma_rx_buff:
        pxa_free_dma(si->txdma);
err_tx_dma:
        pxa_free_dma(si->rxdma);
err_rx_dma:
        free_irq(IRQ_ICP, dev);
err_irq2:
        free_irq(IRQ_STUART, dev);
err_irq1:

        return err;
}

static int pxa_irda_stop(struct net_device *dev)
{
        struct pxa_irda *si = netdev_priv(dev);

        netif_stop_queue(dev);

        pxa_irda_shutdown(si);

        /* Stop IrLAP */
        if (si->irlap) {
                irlap_close(si->irlap);
                si->irlap = NULL;
        }

        free_irq(IRQ_STUART, dev);
        free_irq(IRQ_ICP, dev);

        pxa_free_dma(si->rxdma);
        pxa_free_dma(si->txdma);

        if (si->dma_rx_buff)
                dma_free_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT, si->dma_tx_buff, si->dma_tx_buff_phy);
        if (si->dma_tx_buff)
                dma_free_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT, si->dma_rx_buff, si->dma_rx_buff_phy);

        printk(KERN_DEBUG "pxa_ir: irda driver closed\n");
        return 0;
}

static int pxa_irda_suspend(struct platform_device *_dev, pm_message_t state)
{
        struct net_device *dev = platform_get_drvdata(_dev);
        struct pxa_irda *si;

        if (dev && netif_running(dev)) {
                si = netdev_priv(dev);
                netif_device_detach(dev);
                pxa_irda_shutdown(si);
        }

        return 0;
}

static int pxa_irda_resume(struct platform_device *_dev)
{
        struct net_device *dev = platform_get_drvdata(_dev);
        struct pxa_irda *si;

        if (dev && netif_running(dev)) {
                si = netdev_priv(dev);
                pxa_irda_startup(si);
                netif_device_attach(dev);
                netif_wake_queue(dev);
        }

        return 0;
}


static int pxa_irda_init_iobuf(iobuff_t *io, int size)
{
        io->head = kmalloc(size, GFP_KERNEL | GFP_DMA);
        if (io->head != NULL) {
                io->truesize = size;
                io->in_frame = FALSE;
                io->state    = OUTSIDE_FRAME;
                io->data     = io->head;
        }
        return io->head ? 0 : -ENOMEM;
}

static int pxa_irda_probe(struct platform_device *pdev)
{
        struct net_device *dev;
        struct pxa_irda *si;
        unsigned int baudrate_mask;
        int err;

        if (!pdev->dev.platform_data)
                return -ENODEV;

        err = request_mem_region(__PREG(STUART), 0x24, "IrDA") ? 0 : -EBUSY;
        if (err)
                goto err_mem_1;

        err = request_mem_region(__PREG(FICP), 0x1c, "IrDA") ? 0 : -EBUSY;
        if (err)
                goto err_mem_2;

        dev = alloc_irdadev(sizeof(struct pxa_irda));
        if (!dev)
                goto err_mem_3;

        si = netdev_priv(dev);
        si->dev = &pdev->dev;
        si->pdata = pdev->dev.platform_data;

        /*
         * Initialise the SIR buffers
         */
        err = pxa_irda_init_iobuf(&si->rx_buff, 14384);
        if (err)
                goto err_mem_4;
        err = pxa_irda_init_iobuf(&si->tx_buff, 4000);
        if (err)
                goto err_mem_5;

        dev->hard_start_xmit    = pxa_irda_hard_xmit;
        dev->open               = pxa_irda_start;
        dev->stop               = pxa_irda_stop;
        dev->do_ioctl           = pxa_irda_ioctl;
        dev->get_stats          = pxa_irda_stats;

        irda_init_max_qos_capabilies(&si->qos);

        baudrate_mask = 0;
        if (si->pdata->transceiver_cap & IR_SIRMODE)
                baudrate_mask |= IR_9600|IR_19200|IR_38400|IR_57600|IR_115200;
        if (si->pdata->transceiver_cap & IR_FIRMODE)
                baudrate_mask |= IR_4000000 << 8;

        si->qos.baud_rate.bits &= baudrate_mask;
        si->qos.min_turn_time.bits = 7;  /* 1ms or more */

        irda_qos_bits_to_value(&si->qos);

        err = register_netdev(dev);

        if (err == 0)
                dev_set_drvdata(&pdev->dev, dev);

        if (err) {
                kfree(si->tx_buff.head);
err_mem_5:
                kfree(si->rx_buff.head);
err_mem_4:
                free_netdev(dev);
err_mem_3:
                release_mem_region(__PREG(FICP), 0x1c);
err_mem_2:
                release_mem_region(__PREG(STUART), 0x24);
        }
err_mem_1:
        return err;
}

static int pxa_irda_remove(struct platform_device *_dev)
{
        struct net_device *dev = platform_get_drvdata(_dev);

        if (dev) {
                struct pxa_irda *si = netdev_priv(dev);
                unregister_netdev(dev);
                kfree(si->tx_buff.head);
                kfree(si->rx_buff.head);
                free_netdev(dev);
        }

        release_mem_region(__PREG(STUART), 0x24);
        release_mem_region(__PREG(FICP), 0x1c);

        return 0;
}

static struct platform_driver pxa_ir_driver = {
        .driver         = {
                .name   = "pxa2xx-ir",
        },
        .probe          = pxa_irda_probe,
        .remove         = pxa_irda_remove,
        .suspend        = pxa_irda_suspend,
        .resume         = pxa_irda_resume,
};

static int __init pxa_irda_init(void)
{
        return platform_driver_register(&pxa_ir_driver);
}

static void __exit pxa_irda_exit(void)
{
        platform_driver_unregister(&pxa_ir_driver);
}

module_init(pxa_irda_init);
module_exit(pxa_irda_exit);

MODULE_LICENSE("GPL");