irda: new Blackfin on-chip SIR IrDA driver

Signed-off-by: Graff Yang <graff.yang@gmail.com>
Cc: Mike Frysinger <vapier@gentoo.org>
Cc: Bryan Wu <bryan.wu@analog.com>
Signed-off-by: Samuel Ortiz <samuel@sortiz.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

4 files changed, 1014 insertions, 0 deletions

diff --git a/drivers/net/irda/Kconfig b/drivers/net/irda/Kconfig
index e6317557a531..f76384221422 100644
--- a/drivers/net/irda/Kconfig
+++ b/drivers/net/irda/Kconfig
@@ -17,6 +17,51 @@ config IRTTY_SIR
 
           If unsure, say Y.
 
+config BFIN_SIR
+        tristate "Blackfin SIR on UART"
+        depends on BLACKFIN && IRDA
+        default n
+        help
+          Say Y here if your want to enable SIR function on Blackfin UART
+          devices.
+
+          To activate this driver you can start irattach like:
+          "irattach irda0 -s"
+
+          Saying M, it will be built as a module named bfin_sir.
+
+          Note that you need to turn off one of the serial drivers for SIR
+          to use that UART.
+
+config BFIN_SIR0
+        bool "Blackfin SIR on UART0"
+        depends on BFIN_SIR && !SERIAL_BFIN_UART0
+
+config BFIN_SIR1
+        bool "Blackfin SIR on UART1"
+        depends on BFIN_SIR && !SERIAL_BFIN_UART1 && (!BF531 && !BF532 && !BF533 && !BF561)
+
+config BFIN_SIR2
+        bool "Blackfin SIR on UART2"
+        depends on BFIN_SIR && !SERIAL_BFIN_UART2 && (BF54x || BF538 || BF539)
+
+config BFIN_SIR3
+        bool "Blackfin SIR on UART3"
+        depends on BFIN_SIR && !SERIAL_BFIN_UART3 && (BF54x)
+
+choice
+        prompt "SIR Mode"
+        depends on BFIN_SIR
+        default SIR_BFIN_DMA
+
+config SIR_BFIN_DMA
+        bool "DMA mode"
+        depends on !DMA_UNCACHED_NONE
+
+config SIR_BFIN_PIO
+        bool "PIO mode"
+endchoice
+
 comment "Dongle support"
 
 config DONGLE
diff --git a/drivers/net/irda/Makefile b/drivers/net/irda/Makefile
index 5d20fde32a24..d82e1e3bd8c8 100644
--- a/drivers/net/irda/Makefile
+++ b/drivers/net/irda/Makefile
@@ -21,6 +21,7 @@ obj-$(CONFIG_MCS_FIR)	        += mcs7780.o
 obj-$(CONFIG_AU1000_FIR)        += au1k_ir.o
 # SIR drivers
 obj-$(CONFIG_IRTTY_SIR)         += irtty-sir.o  sir-dev.o
+obj-$(CONFIG_BFIN_SIR)          += bfin_sir.o
 # dongle drivers for SIR drivers
 obj-$(CONFIG_ESI_DONGLE)        += esi-sir.o
 obj-$(CONFIG_TEKRAM_DONGLE)     += tekram-sir.o
diff --git a/drivers/net/irda/bfin_sir.c b/drivers/net/irda/bfin_sir.c
new file mode 100644
index 000000000000..f3eed6a8fba5
--- /dev/null
+++ b/drivers/net/irda/bfin_sir.c
@@ -0,0 +1,820 @@
+/*
+ * Blackfin Infra-red Driver
+ *
+ * Copyright 2006-2009 Analog Devices Inc.
+ *
+ * Enter bugs at http://blackfin.uclinux.org/
+ *
+ * Licensed under the GPL-2 or later.
+ *
+ */
+#include "bfin_sir.h"
+
+#ifdef CONFIG_SIR_BFIN_DMA
+#define DMA_SIR_RX_XCNT        10
+#define DMA_SIR_RX_YCNT        (PAGE_SIZE / DMA_SIR_RX_XCNT)
+#define DMA_SIR_RX_FLUSH_JIFS  (HZ * 4 / 250)
+#endif
+
+#if ANOMALY_05000447
+static int max_rate = 57600;
+#else
+static int max_rate = 115200;
+#endif
+
+static void turnaround_delay(unsigned long last_jif, int mtt)
+{
+        long ticks;
+
+        mtt = mtt < 10000 ? 10000 : mtt;
+        ticks = 1 + mtt / (USEC_PER_SEC / HZ);
+        schedule_timeout_uninterruptible(ticks);
+}
+
+static void __devinit bfin_sir_init_ports(struct bfin_sir_port *sp, struct platform_device *pdev)
+{
+        int i;
+        struct resource *res;
+
+        for (i = 0; i < pdev->num_resources; i++) {
+                res = &pdev->resource[i];
+                switch (res->flags) {
+                case IORESOURCE_MEM:
+                        sp->membase   = (void __iomem *)res->start;
+                        break;
+                case IORESOURCE_IRQ:
+                        sp->irq = res->start;
+                        break;
+                case IORESOURCE_DMA:
+                        sp->rx_dma_channel = res->start;
+                        sp->tx_dma_channel = res->end;
+                        break;
+                default:
+                        break;
+                }
+        }
+
+        sp->clk = get_sclk();
+#ifdef CONFIG_SIR_BFIN_DMA
+        sp->tx_done        = 1;
+        init_timer(&(sp->rx_dma_timer));
+#endif
+}
+
+static void bfin_sir_stop_tx(struct bfin_sir_port *port)
+{
+#ifdef CONFIG_SIR_BFIN_DMA
+        disable_dma(port->tx_dma_channel);
+#endif
+
+        while (!(SIR_UART_GET_LSR(port) & THRE)) {
+                cpu_relax();
+                continue;
+        }
+
+        SIR_UART_STOP_TX(port);
+}
+
+static void bfin_sir_enable_tx(struct bfin_sir_port *port)
+{
+        SIR_UART_ENABLE_TX(port);
+}
+
+static void bfin_sir_stop_rx(struct bfin_sir_port *port)
+{
+        SIR_UART_STOP_RX(port);
+}
+
+static void bfin_sir_enable_rx(struct bfin_sir_port *port)
+{
+        SIR_UART_ENABLE_RX(port);
+}
+
+static int bfin_sir_set_speed(struct bfin_sir_port *port, int speed)
+{
+        int ret = -EINVAL;
+        unsigned int quot;
+        unsigned short val, lsr, lcr;
+        static int utime;
+        int count = 10;
+
+        lcr = WLS(8);
+
+        switch (speed) {
+        case 9600:
+        case 19200:
+        case 38400:
+        case 57600:
+        case 115200:
+
+                quot = (port->clk + (8 * speed)) / (16 * speed)\
+                                                - ANOMALY_05000230;
+
+                do {
+                        udelay(utime);
+                        lsr = SIR_UART_GET_LSR(port);
+                } while (!(lsr & TEMT) && count--);
+
+                /* The useconds for 1 bits to transmit */
+                utime = 1000000 / speed + 1;
+
+                /* Clear UCEN bit to reset the UART state machine
+                 * and control registers
+                 */
+                val = SIR_UART_GET_GCTL(port);
+                val &= ~UCEN;
+                SIR_UART_PUT_GCTL(port, val);
+
+                /* Set DLAB in LCR to Access THR RBR IER */
+                SIR_UART_SET_DLAB(port);
+                SSYNC();
+
+                SIR_UART_PUT_DLL(port, quot & 0xFF);
+                SIR_UART_PUT_DLH(port, (quot >> 8) & 0xFF);
+                SSYNC();
+
+                /* Clear DLAB in LCR */
+                SIR_UART_CLEAR_DLAB(port);
+                SSYNC();
+
+                SIR_UART_PUT_LCR(port, lcr);
+
+                val = SIR_UART_GET_GCTL(port);
+                val |= UCEN;
+                SIR_UART_PUT_GCTL(port, val);
+
+                ret = 0;
+                break;
+        default:
+                printk(KERN_WARNING "bfin_sir: Invalid speed %d\n", speed);
+                break;
+        }
+
+        val = SIR_UART_GET_GCTL(port);
+        /* If not add the 'RPOLC', we can't catch the receive interrupt.
+         * It's related with the HW layout and the IR transiver.
+         */
+        val |= IREN | RPOLC;
+        SIR_UART_PUT_GCTL(port, val);
+        return ret;
+}
+
+static int bfin_sir_is_receiving(struct net_device *dev)
+{
+        struct bfin_sir_self *self = netdev_priv(dev);
+        struct bfin_sir_port *port = self->sir_port;
+
+        if (!(SIR_UART_GET_IER(port) & ERBFI))
+                return 0;
+        return self->rx_buff.state != OUTSIDE_FRAME;
+}
+
+#ifdef CONFIG_SIR_BFIN_PIO
+static void bfin_sir_tx_chars(struct net_device *dev)
+{
+        unsigned int chr;
+        struct bfin_sir_self *self = netdev_priv(dev);
+        struct bfin_sir_port *port = self->sir_port;
+
+        if (self->tx_buff.len != 0) {
+                chr = *(self->tx_buff.data);
+                SIR_UART_PUT_CHAR(port, chr);
+                self->tx_buff.data++;
+                self->tx_buff.len--;
+        } else {
+                self->stats.tx_packets++;
+                self->stats.tx_bytes += self->tx_buff.data - self->tx_buff.head;
+                if (self->newspeed) {
+                        bfin_sir_set_speed(port, self->newspeed);
+                        self->speed = self->newspeed;
+                        self->newspeed = 0;
+                }
+                bfin_sir_stop_tx(port);
+                bfin_sir_enable_rx(port);
+                /* I'm hungry! */
+                netif_wake_queue(dev);
+        }
+}
+
+static void bfin_sir_rx_chars(struct net_device *dev)
+{
+        struct bfin_sir_self *self = netdev_priv(dev);
+        struct bfin_sir_port *port = self->sir_port;
+        unsigned char ch;
+
+        SIR_UART_CLEAR_LSR(port);
+        ch = SIR_UART_GET_CHAR(port);
+        async_unwrap_char(dev, &self->stats, &self->rx_buff, ch);
+        dev->last_rx = jiffies;
+}
+
+static irqreturn_t bfin_sir_rx_int(int irq, void *dev_id)
+{
+        struct net_device *dev = dev_id;
+        struct bfin_sir_self *self = netdev_priv(dev);
+        struct bfin_sir_port *port = self->sir_port;
+
+        spin_lock(&self->lock);
+        while ((SIR_UART_GET_LSR(port) & DR))
+                bfin_sir_rx_chars(dev);
+        spin_unlock(&self->lock);
+
+        return IRQ_HANDLED;
+}
+
+static irqreturn_t bfin_sir_tx_int(int irq, void *dev_id)
+{
+        struct net_device *dev = dev_id;
+        struct bfin_sir_self *self = netdev_priv(dev);
+        struct bfin_sir_port *port = self->sir_port;
+
+        spin_lock(&self->lock);
+        if (SIR_UART_GET_LSR(port) & THRE)
+                bfin_sir_tx_chars(dev);
+        spin_unlock(&self->lock);
+
+        return IRQ_HANDLED;
+}
+#endif /* CONFIG_SIR_BFIN_PIO */
+
+#ifdef CONFIG_SIR_BFIN_DMA
+static void bfin_sir_dma_tx_chars(struct net_device *dev)
+{
+        struct bfin_sir_self *self = netdev_priv(dev);
+        struct bfin_sir_port *port = self->sir_port;
+
+        if (!port->tx_done)
+                return;
+        port->tx_done = 0;
+
+        if (self->tx_buff.len == 0) {
+                self->stats.tx_packets++;
+                if (self->newspeed) {
+                        bfin_sir_set_speed(port, self->newspeed);
+                        self->speed = self->newspeed;
+                        self->newspeed = 0;
+                }
+                bfin_sir_enable_rx(port);
+                port->tx_done = 1;
+                netif_wake_queue(dev);
+                return;
+        }
+
+        blackfin_dcache_flush_range((unsigned long)(self->tx_buff.data),
+                (unsigned long)(self->tx_buff.data+self->tx_buff.len));
+        set_dma_config(port->tx_dma_channel,
+                set_bfin_dma_config(DIR_READ, DMA_FLOW_STOP,
+                        INTR_ON_BUF, DIMENSION_LINEAR, DATA_SIZE_8,
+                        DMA_SYNC_RESTART));
+        set_dma_start_addr(port->tx_dma_channel,
+                (unsigned long)(self->tx_buff.data));
+        set_dma_x_count(port->tx_dma_channel, self->tx_buff.len);
+        set_dma_x_modify(port->tx_dma_channel, 1);
+        enable_dma(port->tx_dma_channel);
+}
+
+static irqreturn_t bfin_sir_dma_tx_int(int irq, void *dev_id)
+{
+        struct net_device *dev = dev_id;
+        struct bfin_sir_self *self = netdev_priv(dev);
+        struct bfin_sir_port *port = self->sir_port;
+
+        spin_lock(&self->lock);
+        if (!(get_dma_curr_irqstat(port->tx_dma_channel) & DMA_RUN)) {
+                clear_dma_irqstat(port->tx_dma_channel);
+                bfin_sir_stop_tx(port);
+
+                self->stats.tx_packets++;
+                self->stats.tx_bytes += self->tx_buff.len;
+                self->tx_buff.len = 0;
+                if (self->newspeed) {
+                        bfin_sir_set_speed(port, self->newspeed);
+                        self->speed = self->newspeed;
+                        self->newspeed = 0;
+                }
+                bfin_sir_enable_rx(port);
+                /* I'm hungry! */
+                netif_wake_queue(dev);
+                port->tx_done = 1;
+        }
+        spin_unlock(&self->lock);
+
+        return IRQ_HANDLED;
+}
+
+static void bfin_sir_dma_rx_chars(struct net_device *dev)
+{
+        struct bfin_sir_self *self = netdev_priv(dev);
+        struct bfin_sir_port *port = self->sir_port;
+        int i;
+
+        SIR_UART_CLEAR_LSR(port);
+
+        for (i = port->rx_dma_buf.head; i < port->rx_dma_buf.tail; i++)
+                async_unwrap_char(dev, &self->stats, &self->rx_buff, port->rx_dma_buf.buf[i]);
+}
+
+void bfin_sir_rx_dma_timeout(struct net_device *dev)
+{
+        struct bfin_sir_self *self = netdev_priv(dev);
+        struct bfin_sir_port *port = self->sir_port;
+        int x_pos, pos;
+        unsigned long flags;
+
+        spin_lock_irqsave(&self->lock, flags);
+        x_pos = DMA_SIR_RX_XCNT - get_dma_curr_xcount(port->rx_dma_channel);
+        if (x_pos == DMA_SIR_RX_XCNT)
+                x_pos = 0;
+
+        pos = port->rx_dma_nrows * DMA_SIR_RX_XCNT + x_pos;
+
+        if (pos > port->rx_dma_buf.tail) {
+                port->rx_dma_buf.tail = pos;
+                bfin_sir_dma_rx_chars(dev);
+                port->rx_dma_buf.head = port->rx_dma_buf.tail;
+        }
+        spin_unlock_irqrestore(&self->lock, flags);
+}
+
+static irqreturn_t bfin_sir_dma_rx_int(int irq, void *dev_id)
+{
+        struct net_device *dev = dev_id;
+        struct bfin_sir_self *self = netdev_priv(dev);
+        struct bfin_sir_port *port = self->sir_port;
+        unsigned short irqstat;
+
+        spin_lock(&self->lock);
+
+        port->rx_dma_nrows++;
+        port->rx_dma_buf.tail = DMA_SIR_RX_XCNT * port->rx_dma_nrows;
+        bfin_sir_dma_rx_chars(dev);
+        if (port->rx_dma_nrows >= DMA_SIR_RX_YCNT) {
+                port->rx_dma_nrows = 0;
+                port->rx_dma_buf.tail = 0;
+        }
+        port->rx_dma_buf.head = port->rx_dma_buf.tail;
+
+        irqstat = get_dma_curr_irqstat(port->rx_dma_channel);
+        clear_dma_irqstat(port->rx_dma_channel);
+        spin_unlock(&self->lock);
+
+        mod_timer(&port->rx_dma_timer, jiffies + DMA_SIR_RX_FLUSH_JIFS);
+        return IRQ_HANDLED;
+}
+#endif /* CONFIG_SIR_BFIN_DMA */
+
+static int bfin_sir_startup(struct bfin_sir_port *port, struct net_device *dev)
+{
+#ifdef CONFIG_SIR_BFIN_DMA
+        dma_addr_t dma_handle;
+#endif /* CONFIG_SIR_BFIN_DMA */
+
+        if (request_dma(port->rx_dma_channel, "BFIN_UART_RX") < 0) {
+                dev_warn(&dev->dev, "Unable to attach SIR RX DMA channel\n");
+                return -EBUSY;
+        }
+
+        if (request_dma(port->tx_dma_channel, "BFIN_UART_TX") < 0) {
+                dev_warn(&dev->dev, "Unable to attach SIR TX DMA channel\n");
+                free_dma(port->rx_dma_channel);
+                return -EBUSY;
+        }
+
+#ifdef CONFIG_SIR_BFIN_DMA
+
+        set_dma_callback(port->rx_dma_channel, bfin_sir_dma_rx_int, dev);
+        set_dma_callback(port->tx_dma_channel, bfin_sir_dma_tx_int, dev);
+
+        port->rx_dma_buf.buf = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_DMA);
+        port->rx_dma_buf.head = 0;
+        port->rx_dma_buf.tail = 0;
+        port->rx_dma_nrows = 0;
+
+        set_dma_config(port->rx_dma_channel,
+                                set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO,
+                                                                        INTR_ON_ROW, DIMENSION_2D,
+                                                                        DATA_SIZE_8, DMA_SYNC_RESTART));
+        set_dma_x_count(port->rx_dma_channel, DMA_SIR_RX_XCNT);
+        set_dma_x_modify(port->rx_dma_channel, 1);
+        set_dma_y_count(port->rx_dma_channel, DMA_SIR_RX_YCNT);
+        set_dma_y_modify(port->rx_dma_channel, 1);
+        set_dma_start_addr(port->rx_dma_channel, (unsigned long)port->rx_dma_buf.buf);
+        enable_dma(port->rx_dma_channel);
+
+        port->rx_dma_timer.data = (unsigned long)(dev);
+        port->rx_dma_timer.function = (void *)bfin_sir_rx_dma_timeout;
+
+#else
+
+        if (request_irq(port->irq, bfin_sir_rx_int, IRQF_DISABLED, "BFIN_SIR_RX", dev)) {
+                dev_warn(&dev->dev, "Unable to attach SIR RX interrupt\n");
+                return -EBUSY;
+        }
+
+        if (request_irq(port->irq+1, bfin_sir_tx_int, IRQF_DISABLED, "BFIN_SIR_TX", dev)) {
+                dev_warn(&dev->dev, "Unable to attach SIR TX interrupt\n");
+                free_irq(port->irq, dev);
+                return -EBUSY;
+        }
+#endif
+
+        return 0;
+}
+
+static void bfin_sir_shutdown(struct bfin_sir_port *port, struct net_device *dev)
+{
+        unsigned short val;
+
+        bfin_sir_stop_rx(port);
+        SIR_UART_DISABLE_INTS(port);
+
+        val = SIR_UART_GET_GCTL(port);
+        val &= ~(UCEN | IREN | RPOLC);
+        SIR_UART_PUT_GCTL(port, val);
+
+#ifdef CONFIG_SIR_BFIN_DMA
+        disable_dma(port->tx_dma_channel);
+        disable_dma(port->rx_dma_channel);
+        del_timer(&(port->rx_dma_timer));
+        dma_free_coherent(NULL, PAGE_SIZE, port->rx_dma_buf.buf, 0);
+#else
+        free_irq(port->irq+1, dev);
+        free_irq(port->irq, dev);
+#endif
+        free_dma(port->tx_dma_channel);
+        free_dma(port->rx_dma_channel);
+}
+
+#ifdef CONFIG_PM
+static int bfin_sir_suspend(struct platform_device *pdev, pm_message_t state)
+{
+        struct bfin_sir_port *sir_port;
+        struct net_device *dev;
+        struct bfin_sir_self *self;
+
+        sir_port = platform_get_drvdata(pdev);
+        if (!sir_port)
+                return 0;
+
+        dev = sir_port->dev;
+        self = netdev_priv(dev);
+        if (self->open) {
+                flush_work(&self->work);
+                bfin_sir_shutdown(self->sir_port, dev);
+                netif_device_detach(dev);
+        }
+
+        return 0;
+}
+static int bfin_sir_resume(struct platform_device *pdev)
+{
+        struct bfin_sir_port *sir_port;
+        struct net_device *dev;
+        struct bfin_sir_self *self;
+        struct bfin_sir_port *port;
+
+        sir_port = platform_get_drvdata(pdev);
+        if (!sir_port)
+                return 0;
+
+        dev = sir_port->dev;
+        self = netdev_priv(dev);
+        port = self->sir_port;
+        if (self->open) {
+                if (self->newspeed) {
+                        self->speed = self->newspeed;
+                        self->newspeed = 0;
+                }
+                bfin_sir_startup(port, dev);
+                bfin_sir_set_speed(port, 9600);
+                bfin_sir_enable_rx(port);
+                netif_device_attach(dev);
+        }
+        return 0;
+}
+#else
+#define bfin_sir_suspend   NULL
+#define bfin_sir_resume    NULL
+#endif
+
+static void bfin_sir_send_work(struct work_struct *work)
+{
+        struct bfin_sir_self  *self = container_of(work, struct bfin_sir_self, work);
+        struct net_device *dev = self->sir_port->dev;
+        struct bfin_sir_port *port = self->sir_port;
+        unsigned short val;
+        int tx_cnt = 10;
+
+        while (bfin_sir_is_receiving(dev) && --tx_cnt)
+                turnaround_delay(dev->last_rx, self->mtt);
+
+        bfin_sir_stop_rx(port);
+
+        /* To avoid losting RX interrupt, we reset IR function before
+         * sending data. We also can set the speed, which will
+         * reset all the UART.
+         */
+        val = SIR_UART_GET_GCTL(port);
+        val &= ~(IREN | RPOLC);
+        SIR_UART_PUT_GCTL(port, val);
+        SSYNC();
+        val |= IREN | RPOLC;
+        SIR_UART_PUT_GCTL(port, val);
+        SSYNC();
+        /* bfin_sir_set_speed(port, self->speed); */
+
+#ifdef CONFIG_SIR_BFIN_DMA
+        bfin_sir_dma_tx_chars(dev);
+#endif
+        bfin_sir_enable_tx(port);
+        dev->trans_start = jiffies;
+}
+
+static int bfin_sir_hard_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+        struct bfin_sir_self *self = netdev_priv(dev);
+        int speed = irda_get_next_speed(skb);
+
+        netif_stop_queue(dev);
+
+        self->mtt = irda_get_mtt(skb);
+
+        if (speed != self->speed && speed != -1)
+                self->newspeed = speed;
+
+        self->tx_buff.data = self->tx_buff.head;
+        if (skb->len == 0)
+                self->tx_buff.len = 0;
+        else
+                self->tx_buff.len = async_wrap_skb(skb, self->tx_buff.data, self->tx_buff.truesize);
+
+        schedule_work(&self->work);
+        dev_kfree_skb(skb);
+
+        return 0;
+}
+
+static int bfin_sir_ioctl(struct net_device *dev, struct ifreq *ifreq, int cmd)
+{
+        struct if_irda_req *rq = (struct if_irda_req *)ifreq;
+        struct bfin_sir_self *self = netdev_priv(dev);
+        struct bfin_sir_port *port = self->sir_port;
+        int ret = 0;
+
+        switch (cmd) {
+        case SIOCSBANDWIDTH:
+                if (capable(CAP_NET_ADMIN)) {
+                        if (self->open) {
+                                ret = bfin_sir_set_speed(port, rq->ifr_baudrate);
+                                bfin_sir_enable_rx(port);
+                        } else {
+                                dev_warn(&dev->dev, "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:
+                rq->ifr_receiving = bfin_sir_is_receiving(dev);
+                break;
+
+        default:
+                ret = -EOPNOTSUPP;
+                break;
+        }
+
+        return ret;
+}
+
+static struct net_device_stats *bfin_sir_stats(struct net_device *dev)
+{
+        struct bfin_sir_self *self = netdev_priv(dev);
+
+        return &self->stats;
+}
+
+static int bfin_sir_open(struct net_device *dev)
+{
+        struct bfin_sir_self *self = netdev_priv(dev);
+        struct bfin_sir_port *port = self->sir_port;
+        int err = -ENOMEM;
+
+        self->newspeed = 0;
+        self->speed = 9600;
+
+        spin_lock_init(&self->lock);
+
+        err = bfin_sir_startup(port, dev);
+        if (err)
+                goto err_startup;
+
+        bfin_sir_set_speed(port, 9600);
+
+        self->irlap = irlap_open(dev, &self->qos, DRIVER_NAME);
+        if (!self->irlap)
+                goto err_irlap;
+
+        INIT_WORK(&self->work, bfin_sir_send_work);
+
+        /*
+         * Now enable the interrupt then start the queue
+         */
+        self->open = 1;
+        bfin_sir_enable_rx(port);
+
+        netif_start_queue(dev);
+
+        return 0;
+
+err_irlap:
+        self->open = 0;
+        bfin_sir_shutdown(port, dev);
+err_startup:
+        return err;
+}
+
+static int bfin_sir_stop(struct net_device *dev)
+{
+        struct bfin_sir_self *self = netdev_priv(dev);
+
+        flush_work(&self->work);
+        bfin_sir_shutdown(self->sir_port, dev);
+
+        if (self->rxskb) {
+                dev_kfree_skb(self->rxskb);
+                self->rxskb = NULL;
+        }
+
+        /* Stop IrLAP */
+        if (self->irlap) {
+                irlap_close(self->irlap);
+                self->irlap = NULL;
+        }
+
+        netif_stop_queue(dev);
+        self->open = 0;
+
+        return 0;
+}
+
+static int bfin_sir_init_iobuf(iobuff_t *io, int size)
+{
+        io->head = kmalloc(size, GFP_KERNEL);
+        if (!io->head)
+                return -ENOMEM;
+        io->truesize = size;
+        io->in_frame = FALSE;
+        io->state    = OUTSIDE_FRAME;
+        io->data     = io->head;
+        return 0;
+}
+
+static int __devinit bfin_sir_probe(struct platform_device *pdev)
+{
+        struct net_device *dev;
+        struct bfin_sir_self *self;
+        unsigned int baudrate_mask;
+        struct bfin_sir_port *sir_port;
+        int err;
+
+        if (pdev->id >= 0 && pdev->id < ARRAY_SIZE(per) && \
+                                per[pdev->id][3] == pdev->id) {
+                err = peripheral_request_list(per[pdev->id], DRIVER_NAME);
+                if (err)
+                        return err;
+        } else {
+                dev_err(&pdev->dev, "Invalid pdev id, please check board file\n");
+                return -ENODEV;
+        }
+
+        err = -ENOMEM;
+        sir_port = kmalloc(sizeof(*sir_port), GFP_KERNEL);
+        if (!sir_port)
+                goto err_mem_0;
+
+        bfin_sir_init_ports(sir_port, pdev);
+
+        dev = alloc_irdadev(sizeof(*self));
+        if (!dev)
+                goto err_mem_1;
+
+        self = netdev_priv(dev);
+        self->dev = &pdev->dev;
+        self->sir_port = sir_port;
+        sir_port->dev = dev;
+
+        err = bfin_sir_init_iobuf(&self->rx_buff, IRDA_SKB_MAX_MTU);
+        if (err)
+                goto err_mem_2;
+        err = bfin_sir_init_iobuf(&self->tx_buff, IRDA_SIR_MAX_FRAME);
+        if (err)
+                goto err_mem_3;
+
+        dev->hard_start_xmit = bfin_sir_hard_xmit;
+        dev->open            = bfin_sir_open;
+        dev->stop            = bfin_sir_stop;
+        dev->do_ioctl        = bfin_sir_ioctl;
+        dev->get_stats       = bfin_sir_stats;
+        dev->irq             = sir_port->irq;
+
+        irda_init_max_qos_capabilies(&self->qos);
+
+        baudrate_mask = IR_9600;
+
+        switch (max_rate) {
+        case 115200:
+                baudrate_mask |= IR_115200;
+        case 57600:
+                baudrate_mask |= IR_57600;
+        case 38400:
+                baudrate_mask |= IR_38400;
+        case 19200:
+                baudrate_mask |= IR_19200;
+        case 9600:
+                break;
+        default:
+                dev_warn(&pdev->dev, "Invalid maximum baud rate, using 9600\n");
+        }
+
+        self->qos.baud_rate.bits &= baudrate_mask;
+
+        self->qos.min_turn_time.bits = 1; /* 10 ms or more */
+
+        irda_qos_bits_to_value(&self->qos);
+
+        err = register_netdev(dev);
+
+        if (err) {
+                kfree(self->tx_buff.head);
+err_mem_3:
+                kfree(self->rx_buff.head);
+err_mem_2:
+                free_netdev(dev);
+err_mem_1:
+                kfree(sir_port);
+err_mem_0:
+                peripheral_free_list(per[pdev->id]);
+        } else
+                platform_set_drvdata(pdev, sir_port);
+
+        return err;
+}
+
+static int __devexit bfin_sir_remove(struct platform_device *pdev)
+{
+        struct bfin_sir_port *sir_port;
+        struct net_device *dev = NULL;
+        struct bfin_sir_self *self;
+
+        sir_port = platform_get_drvdata(pdev);
+        if (!sir_port)
+                return 0;
+        dev = sir_port->dev;
+        self = netdev_priv(dev);
+        unregister_netdev(dev);
+        kfree(self->tx_buff.head);
+        kfree(self->rx_buff.head);
+        free_netdev(dev);
+        kfree(sir_port);
+        platform_set_drvdata(pdev, NULL);
+
+        return 0;
+}
+
+static struct platform_driver bfin_ir_driver = {
+        .probe   = bfin_sir_probe,
+        .remove  = __devexit_p(bfin_sir_remove),
+        .suspend = bfin_sir_suspend,
+        .resume  = bfin_sir_resume,
+        .driver  = {
+                .name = DRIVER_NAME,
+        },
+};
+
+static int __init bfin_sir_init(void)
+{
+        return platform_driver_register(&bfin_ir_driver);
+}
+
+static void __exit bfin_sir_exit(void)
+{
+        platform_driver_unregister(&bfin_ir_driver);
+}
+
+module_init(bfin_sir_init);
+module_exit(bfin_sir_exit);
+
+module_param(max_rate, int, 0);
+MODULE_PARM_DESC(max_rate, "Maximum baud rate (115200, 57600, 38400, 19200, 9600)");
+
+MODULE_AUTHOR("Graf Yang <graf.yang@analog.com>");
+MODULE_DESCRIPTION("Blackfin IrDA driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/net/irda/bfin_sir.h b/drivers/net/irda/bfin_sir.h
new file mode 100644
index 000000000000..dac71b1f4f9b
--- /dev/null
+++ b/drivers/net/irda/bfin_sir.h
@@ -0,0 +1,148 @@
+/*
+ * Blackfin Infra-red Driver
+ *
+ * Copyright 2006-2009 Analog Devices Inc.
+ *
+ * Enter bugs at http://blackfin.uclinux.org/
+ *
+ * Licensed under the GPL-2 or later.
+ *
+ */
+
+#include <linux/serial.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+
+#include <net/irda/irda.h>
+#include <net/irda/wrapper.h>
+#include <net/irda/irda_device.h>
+
+#include <asm/irq.h>
+#include <asm/cacheflush.h>
+#include <asm/dma.h>
+#include <asm/portmux.h>
+
+#ifdef CONFIG_SIR_BFIN_DMA
+struct dma_rx_buf {
+        char *buf;
+        int head;
+        int tail;
+};
+#endif
+
+struct bfin_sir_port {
+        unsigned char __iomem   *membase;
+        unsigned int            irq;
+        unsigned int            lsr;
+        unsigned long           clk;
+        struct net_device       *dev;
+#ifdef CONFIG_SIR_BFIN_DMA
+        int                     tx_done;
+        struct dma_rx_buf       rx_dma_buf;
+        struct timer_list       rx_dma_timer;
+        int                     rx_dma_nrows;
+#endif
+        unsigned int            tx_dma_channel;
+        unsigned int            rx_dma_channel;
+};
+
+struct bfin_sir_port_res {
+        unsigned long   base_addr;
+        int             irq;
+        unsigned int    rx_dma_channel;
+        unsigned int    tx_dma_channel;
+};
+
+struct bfin_sir_self {
+        struct bfin_sir_port    *sir_port;
+        spinlock_t              lock;
+        unsigned int            open;
+        int                     speed;
+        int                     newspeed;
+
+        struct sk_buff          *txskb;
+        struct sk_buff          *rxskb;
+        struct net_device_stats stats;
+        struct device           *dev;
+        struct irlap_cb         *irlap;
+        struct qos_info         qos;
+
+        iobuff_t                tx_buff;
+        iobuff_t                rx_buff;
+
+        struct work_struct      work;
+        int                     mtt;
+};
+
+#define DRIVER_NAME "bfin_sir"
+
+#define SIR_UART_GET_CHAR(port)    bfin_read16((port)->membase + OFFSET_RBR)
+#define SIR_UART_GET_DLL(port)     bfin_read16((port)->membase + OFFSET_DLL)
+#define SIR_UART_GET_DLH(port)     bfin_read16((port)->membase + OFFSET_DLH)
+#define SIR_UART_GET_LCR(port)     bfin_read16((port)->membase + OFFSET_LCR)
+#define SIR_UART_GET_GCTL(port)    bfin_read16((port)->membase + OFFSET_GCTL)
+
+#define SIR_UART_PUT_CHAR(port, v) bfin_write16(((port)->membase + OFFSET_THR), v)
+#define SIR_UART_PUT_DLL(port, v)  bfin_write16(((port)->membase + OFFSET_DLL), v)
+#define SIR_UART_PUT_DLH(port, v)  bfin_write16(((port)->membase + OFFSET_DLH), v)
+#define SIR_UART_PUT_LCR(port, v)  bfin_write16(((port)->membase + OFFSET_LCR), v)
+#define SIR_UART_PUT_GCTL(port, v) bfin_write16(((port)->membase + OFFSET_GCTL), v)
+
+#ifdef CONFIG_BF54x
+#define SIR_UART_GET_LSR(port)     bfin_read16((port)->membase + OFFSET_LSR)
+#define SIR_UART_GET_IER(port)     bfin_read16((port)->membase + OFFSET_IER_SET)
+#define SIR_UART_SET_IER(port, v)  bfin_write16(((port)->membase + OFFSET_IER_SET), v)
+#define SIR_UART_CLEAR_IER(port, v) bfin_write16(((port)->membase + OFFSET_IER_CLEAR), v)
+#define SIR_UART_PUT_LSR(port, v)  bfin_write16(((port)->membase + OFFSET_LSR), v)
+#define SIR_UART_CLEAR_LSR(port)   bfin_write16(((port)->membase + OFFSET_LSR), -1)
+
+#define SIR_UART_SET_DLAB(port)
+#define SIR_UART_CLEAR_DLAB(port)
+
+#define SIR_UART_ENABLE_INTS(port, v) SIR_UART_SET_IER(port, v)
+#define SIR_UART_DISABLE_INTS(port)   SIR_UART_CLEAR_IER(port, 0xF)
+#define SIR_UART_STOP_TX(port)     do { SIR_UART_PUT_LSR(port, TFI); SIR_UART_CLEAR_IER(port, ETBEI); } while (0)
+#define SIR_UART_ENABLE_TX(port)   do { SIR_UART_SET_IER(port, ETBEI); } while (0)
+#define SIR_UART_STOP_RX(port)     do { SIR_UART_CLEAR_IER(port, ERBFI); } while (0)
+#define SIR_UART_ENABLE_RX(port)   do { SIR_UART_SET_IER(port, ERBFI); } while (0)
+#else
+
+#define SIR_UART_GET_IIR(port)     bfin_read16((port)->membase + OFFSET_IIR)
+#define SIR_UART_GET_IER(port)     bfin_read16((port)->membase + OFFSET_IER)
+#define SIR_UART_PUT_IER(port, v)  bfin_write16(((port)->membase + OFFSET_IER), v)
+
+#define SIR_UART_SET_DLAB(port)    do { SIR_UART_PUT_LCR(port, SIR_UART_GET_LCR(port) | DLAB); } while (0)
+#define SIR_UART_CLEAR_DLAB(port)  do { SIR_UART_PUT_LCR(port, SIR_UART_GET_LCR(port) & ~DLAB); } while (0)
+
+#define SIR_UART_ENABLE_INTS(port, v) SIR_UART_PUT_IER(port, v)
+#define SIR_UART_DISABLE_INTS(port)   SIR_UART_PUT_IER(port, 0)
+#define SIR_UART_STOP_TX(port)     do { SIR_UART_PUT_IER(port, SIR_UART_GET_IER(port) & ~ETBEI); } while (0)
+#define SIR_UART_ENABLE_TX(port)   do { SIR_UART_PUT_IER(port, SIR_UART_GET_IER(port) | ETBEI); } while (0)
+#define SIR_UART_STOP_RX(port)     do { SIR_UART_PUT_IER(port, SIR_UART_GET_IER(port) & ~ERBFI); } while (0)
+#define SIR_UART_ENABLE_RX(port)   do { SIR_UART_PUT_IER(port, SIR_UART_GET_IER(port) | ERBFI); } while (0)
+
+static inline unsigned int SIR_UART_GET_LSR(struct bfin_sir_port *port)
+{
+        unsigned int lsr = bfin_read16(port->membase + OFFSET_LSR);
+        port->lsr |= (lsr & (BI|FE|PE|OE));
+        return lsr | port->lsr;
+}
+
+static inline void SIR_UART_CLEAR_LSR(struct bfin_sir_port *port)
+{
+        port->lsr = 0;
+        bfin_read16(port->membase + OFFSET_LSR);
+}
+#endif
+
+static const unsigned short per[][4] = {
+        /* rx pin      tx pin     NULL  uart_number */
+        {P_UART0_RX, P_UART0_TX,    0,    0},
+        {P_UART1_RX, P_UART1_TX,    0,    1},
+        {P_UART2_RX, P_UART2_TX,    0,    2},
+        {P_UART3_RX, P_UART3_TX,    0,    3},
+};