irda: new Blackfin on-chip SIR IrDA driver

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

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

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

drivers/net/irda/bfin_sir.c

+/*
+ * 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");

drivers/net/irda/bfin_sir.h

+/*
+ * 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},
+};