[ARM] 2897/2: PXA2xx IRDA support

Patch from Nicolas Pitre

This is the PXA2xx common IRDA driver, plus platform support
for Lubbock and Mainstone.

Signed-off-by: Nicolas Pitre <nico@cam.org>
Acked-by: Jean Tourrilhes <jt@hpl.hp.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

3 files changed, 882 insertions, 0 deletions

diff --git a/drivers/net/irda/Kconfig b/drivers/net/irda/Kconfig
index ca5914091d3a..d54156f11e61 100644
--- a/drivers/net/irda/Kconfig
+++ b/drivers/net/irda/Kconfig
@@ -400,5 +400,15 @@ config VIA_FIR
           To compile it as a module, choose M here: the module will be called
           via-ircc.
 
+config PXA_FICP
+        tristate "Intel PXA2xx Internal FICP"
+        depends on ARCH_PXA && IRDA
+        help
+          Say Y or M here if you want to build support for the PXA2xx
+          built-in IRDA interface which can support both SIR and FIR.
+          This driver relies on platform specific helper routines so
+          available capabilities may vary from one PXA2xx target to
+          another.
+
 endmenu
 
diff --git a/drivers/net/irda/Makefile b/drivers/net/irda/Makefile
index 29a8bd812b21..e7a8b7f7f5dd 100644
--- a/drivers/net/irda/Makefile
+++ b/drivers/net/irda/Makefile
@@ -18,6 +18,7 @@ obj-$(CONFIG_SMC_IRCC_FIR)	+= smsc-ircc2.o
 obj-$(CONFIG_ALI_FIR)           += ali-ircc.o
 obj-$(CONFIG_VLSI_FIR)          += vlsi_ir.o
 obj-$(CONFIG_VIA_FIR)           += via-ircc.o
+obj-$(CONFIG_PXA_FICP)          += pxaficp_ir.o
 # Old dongle drivers for old SIR drivers
 obj-$(CONFIG_ESI_DONGLE_OLD)            += esi.o
 obj-$(CONFIG_TEKRAM_DONGLE_OLD) += tekram.o
diff --git a/drivers/net/irda/pxaficp_ir.c b/drivers/net/irda/pxaficp_ir.c
new file mode 100644
index 000000000000..aef80f5e7c9c
--- /dev/null
+++ b/drivers/net/irda/pxaficp_ir.c
@@ -0,0 +1,871 @@
+/*
+ * 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/config.h>
+#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/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 pt_regs *regs)
+{
+        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, struct pt_regs *regs)
+{
+        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 pt_regs *regs)
+{
+        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 {
+                ICCR0 = 0;
+                pxa_irda_fir_dma_rx_start(si);
+                ICCR0 = ICCR0_ITR | ICCR0_RXE;
+        }
+        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)
+{
+        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_frame_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 = 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->mac.raw  = skb->data;
+                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 pt_regs *regs)
+{
+        struct net_device *dev = dev_id;
+        struct pxa_irda *si = netdev_priv(dev);
+        int icsr0;
+
+        /* 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);
+        }
+
+        ICCR0 = 0;
+        pxa_irda_fir_dma_rx_start(si);
+        ICCR0 = ICCR0_ITR | ICCR0_RXE;
+
+        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;
+                memcpy(si->dma_tx_buff, skb->data, 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 device *_dev, pm_message_t state, u32 level)
+{
+        struct net_device *dev = dev_get_drvdata(_dev);
+        struct pxa_irda *si;
+
+        if (!dev || level != SUSPEND_DISABLE)
+                return 0;
+
+        if (netif_running(dev)) {
+                si = netdev_priv(dev);
+                netif_device_detach(dev);
+                pxa_irda_shutdown(si);
+        }
+
+        return 0;
+}
+
+static int pxa_irda_resume(struct device *_dev, u32 level)
+{
+        struct net_device *dev = dev_get_drvdata(_dev);
+        struct pxa_irda *si;
+
+        if (!dev || level != RESUME_ENABLE)
+                return 0;
+
+        if (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 device *_dev)
+{
+        struct platform_device *pdev = to_platform_device(_dev);
+        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 device *_dev)
+{
+        struct net_device *dev = dev_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 device_driver pxa_ir_driver = {
+        .name           = "pxa2xx-ir",
+        .bus            = &platform_bus_type,
+        .probe          = pxa_irda_probe,
+        .remove         = pxa_irda_remove,
+        .suspend        = pxa_irda_suspend,
+        .resume         = pxa_irda_resume,
+};
+
+static int __init pxa_irda_init(void)
+{
+        return driver_register(&pxa_ir_driver);
+}
+
+static void __exit pxa_irda_exit(void)
+{
+        driver_unregister(&pxa_ir_driver);
+}
+
+module_init(pxa_irda_init);
+module_exit(pxa_irda_exit);
+
+MODULE_LICENSE("GPL");