Message-Id: <1223892294-18683-1-git-send-email-cooloney@kernel.org>
Date:	Mon, 13 Oct 2008 18:04:54 +0800
From:	Bryan Wu <cooloney@...nel.org>
To:	samuel@...tiz.org, jgarzik@...ox.com
Cc:	irda-users@...ts.sourceforge.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, Graf Yang <graf.yang@...log.com>,
	Bryan Wu <cooloney@...nel.org>
Subject: [PATCH 1/1] [net/irda]: new Blackfin on-chip SIR IrDA driver

From: Graf Yang <graf.yang@...log.com>

Signed-off-by: Graf Yang <graf.yang@...log.com>
Signed-off-by: Bryan Wu <cooloney@...nel.org>
---
 drivers/net/irda/Kconfig    |   52 +++
 drivers/net/irda/Makefile   |    1 +
 drivers/net/irda/bfin_sir.c |  824 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 877 insertions(+), 0 deletions(-)
 create mode 100644 drivers/net/irda/bfin_sir.c

diff --git a/drivers/net/irda/Kconfig b/drivers/net/irda/Kconfig
index e631755..4e14d03 100644
--- a/drivers/net/irda/Kconfig
+++ b/drivers/net/irda/Kconfig
@@ -17,6 +17,58 @@ config IRTTY_SIR
 
 	  If unsure, say Y.
 
+config BFIN_SIR
+	tristate "Blackfin SIR on UART"
+	depends on BLACKFIN && IRDA && (!SERIAL_BFIN_UART0 || !SERIAL_BFIN_UART1 || !SERIAL_BFIN_UART2 || !SERIAL_BFIN_UART3 )
+	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 && (BF548 || BF549)
+
+config BFIN_SIR3
+	bool "Blackfin SIR on UART3"
+	depends on BFIN_SIR && !SERIAL_BFIN_UART3 && (BF542 || BF544 || BF548 || BF549)
+
+choice
+	prompt "SIR Mode"
+	depends on BFIN_SIR
+	default SIR_BFIN_DMA
+	help
+	  This driver supports the built-in serial ports of the Blackfin family
+	  of CPUs
+
+config SIR_BFIN_DMA
+	bool "DMA mode"
+	depends on !DMA_UNCACHED_NONE
+	help
+	  This driver works under DMA mode.
+
+config SIR_BFIN_PIO
+	bool "PIO mode"
+	help
+	  This driver works under PIO mode.
+
+endchoice
+
 comment "Dongle support"
 
 config DONGLE
diff --git a/drivers/net/irda/Makefile b/drivers/net/irda/Makefile
index 5d20fde..d82e1e3 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 0000000..55d2d58
--- /dev/null
+++ b/drivers/net/irda/bfin_sir.c
@@ -0,0 +1,824 @@
+/*
+ * Blackfin Infra-red Driver
+ *
+ * Copyright 2006-2008 Analog Devices Inc.
+ *
+ * Enter bugs at http://blackfin.uclinux.org/
+ *
+ * Licensed under the GPL-2 or later.
+ *
+ */
+
+#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/dma.h>
+#include <asm/cacheflush.h>
+
+#include <mach/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
+
+static int max_rate = 115200;
+
+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_interruptible(ticks);
+}
+static void __init bfin_sir_init_ports(int i)
+{
+	sir_ports[i].membase   = (void __iomem *)bfin_sir_port_resource[i].base_addr;
+	sir_ports[i].irq = bfin_sir_port_resource[i].irq;
+	sir_ports[i].clk = get_sclk();
+#ifdef CONFIG_SIR_BFIN_DMA
+	sir_ports[i].tx_done        = 1;
+	init_timer(&(sir_ports[i].rx_dma_timer));
+#endif
+	sir_ports[i].rx_dma_channel = bfin_sir_port_resource[i].rx_dma_channel;
+	sir_ports[i].tx_dma_channel = bfin_sir_port_resource[i].tx_dma_channel;
+}
+
+static void bfin_sir_stop_tx(struct bfin_sir_port *port)
+{
+#ifndef CONFIG_BF54x
+	unsigned short ier;
+#endif
+#ifdef CONFIG_SIR_BFIN_DMA
+	disable_dma(port->tx_dma_channel);
+#endif
+
+	while (!(SIR_UART_GET_LSR(port) & THRE))
+		continue;
+#ifdef CONFIG_BF54x
+	SIR_UART_PUT_LSR(port, TFI);
+	SIR_UART_CLEAR_IER(port, ETBEI);
+#else
+	ier = SIR_UART_GET_IER(port);
+	ier &= ~ETBEI;
+	SIR_UART_PUT_IER(port, ier);
+#endif
+}
+
+static void bfin_sir_enable_tx(struct bfin_sir_port *port)
+{
+#ifndef CONFIG_BF54x
+	unsigned short ier;
+#endif
+#ifdef CONFIG_BF54x
+	SIR_UART_SET_IER(port, ETBEI);
+#else
+	ier = SIR_UART_GET_IER(port);
+	ier |= ETBEI;
+	SIR_UART_PUT_IER(port, ier);
+#endif
+}
+
+static void bfin_sir_stop_rx(struct bfin_sir_port *port)
+{
+#ifdef CONFIG_BF54x
+	SIR_UART_CLEAR_IER(port, ERBFI);
+#else
+	unsigned short ier;
+
+	ier = SIR_UART_GET_IER(port);
+	ier &= ~ERBFI;
+	SIR_UART_PUT_IER(port, ier);
+#endif
+}
+
+static void bfin_sir_enable_rx(struct bfin_sir_port *port)
+{
+#ifdef CONFIG_BF54x
+	SIR_UART_SET_IER(port, ERBFI);
+#else
+	SIR_UART_PUT_IER(port, SIR_UART_GET_IER(port) | ERBFI);
+#endif
+}
+
+static int bfin_sir_set_speed(struct bfin_sir_port *port, int speed)
+{
+	int ret = -EINVAL;
+	unsigned int quot;
+	unsigned short val, lsr, lcr = 0;
+
+	lcr = WLS(8);
+
+	switch (speed) {
+	case 9600:
+	case 19200:
+	case 38400:
+	case 57600:
+	case 115200:
+
+		quot = (port->clk + (8 * speed)) / (16 * speed);
+
+		do {
+			lsr = SIR_UART_GET_LSR(port);
+		} while (!(lsr & TEMT));
+
+		/* 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);
+
+#ifndef CONFIG_BF54x
+		/* Set DLAB in LCR to Access DLL and DLH */
+		val = SIR_UART_GET_LCR(port);
+		val |= DLAB;
+		SIR_UART_PUT_LCR(port, val);
+		SSYNC();
+#endif
+
+		SIR_UART_PUT_DLL(port, quot & 0xFF);
+		SSYNC();
+		SIR_UART_PUT_DLH(port, (quot >> 8) & 0xFF);
+		SSYNC();
+
+#ifndef CONFIG_BF54x
+		/* Clear DLAB in LCR to Access THR RBR IER */
+		val = SIR_UART_GET_LCR(port);
+		val &= ~DLAB;
+		SIR_UART_PUT_LCR(port, val);
+		SSYNC();
+#endif
+
+		SIR_UART_PUT_LCR(port, lcr);
+
+		val = SIR_UART_GET_GCTL(port);
+		val |= UCEN;
+		SIR_UART_PUT_GCTL(port, val);
+
+		ret = 0;
+		/*printk(KERN_DEBUG "bfin_sir: Set new speed %d\n", speed);*/
+		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 = dev->priv;
+	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 = dev->priv;
+	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 = dev->priv;
+	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 = dev->priv;
+	struct bfin_sir_port *port = self->sir_port;
+	while ((SIR_UART_GET_LSR(port) & DR))
+		bfin_sir_rx_chars(dev);
+
+	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 = dev->priv;
+	struct bfin_sir_port *port = self->sir_port;
+
+	if (SIR_UART_GET_LSR(port) & THRE)
+		bfin_sir_tx_chars(dev);
+	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 = dev->priv;
+	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);
+	bfin_sir_enable_tx(port);
+}
+
+static irqreturn_t bfin_sir_dma_tx_int(int irq, void *dev_id)
+{
+	struct net_device *dev = dev_id;
+	struct bfin_sir_self *self = dev->priv;
+	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 = dev->priv;
+	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 = dev->priv;
+	struct bfin_sir_port *port = self->sir_port;
+	int x_pos, pos;
+	int flags = 0;
+
+	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 = dev->priv;
+	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) {
+		printk(KERN_WARNING "bfin_sir: Unable to attach SIR RX DMA channel\n");
+		return -EBUSY;
+	}
+
+	if (request_dma(port->tx_dma_channel, "BFIN_UART_TX") < 0) {
+		printk(KERN_WARNING "bfin_sir: 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)) {
+		printk(KERN_WARNING "bfin_sir: 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)) {
+		printk(KERN_WARNING "bfin_sir: 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);
+#ifdef CONFIG_BF54x
+	SIR_UART_CLEAR_IER(port, 0xF);
+#else
+	SIR_UART_PUT_IER(port, 0);
+#endif
+	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 *psir_ports;
+	struct net_device *dev;
+	struct bfin_sir_self *self;
+	int i;
+
+	psir_ports = platform_get_drvdata(pdev);
+	if (!psir_ports)
+		return 0;
+	for (i = nr_sirs-1; i >= 0; i--) {
+		dev = (psir_ports+i)->dev;
+		self = dev->priv;
+		if (self->open) {
+			flush_scheduled_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 *psir_ports;
+	struct net_device *dev;
+	struct bfin_sir_self *self;
+	struct bfin_sir_port *port;
+	int i;
+
+	psir_ports = platform_get_drvdata(pdev);
+	if (!psir_ports) return 0;
+	for (i = nr_sirs-1; i >= 0; i--) {
+		dev = (psir_ports+i)->dev;
+		self = dev->priv;
+		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);
+#else
+	bfin_sir_enable_tx(port);
+#endif
+	dev->trans_start = jiffies;
+}
+
+static int bfin_sir_hard_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct bfin_sir_self *self = dev->priv;
+	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 = dev->priv;
+	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 {
+				printk(KERN_WARNING "bfin_sir: 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 = dev->priv;
+	return &self->stats;
+}
+
+static int bfin_sir_open(struct net_device *dev)
+{
+	struct bfin_sir_self *self = dev->priv;
+	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 = dev->priv;
+
+	flush_scheduled_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 | 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 __devinit bfin_sir_probe(struct platform_device *pdev)
+{
+	struct net_device *dev;
+	struct bfin_sir_self *self;
+	unsigned int baudrate_mask;
+	int i, err = 0;
+
+	err = bfin_sir_hw_init();
+
+	for (i = 0; i < nr_sirs; i++) {
+		bfin_sir_init_ports(i);
+		dev = alloc_irdadev(sizeof(struct bfin_sir_self));
+		if (!dev)
+			goto err_mem_1;
+
+		self = dev->priv;
+		self->dev = &pdev->dev;
+		self->sir_port = &sir_ports[i];
+		sir_ports[i].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_ports[i].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;
+		}
+
+		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) {
+err_mem_3:
+			kfree(self->tx_buff.head);
+err_mem_2:
+			kfree(self->rx_buff.head);
+err_mem_1:
+			free_netdev(dev);
+		}
+	}
+	if (err == 0)
+		platform_set_drvdata(pdev, sir_ports);
+	return err;
+}
+
+static int __devexit bfin_sir_remove(struct platform_device *pdev)
+{
+	int i;
+	struct bfin_sir_port *psir_ports;
+	struct net_device *dev = NULL;
+	struct bfin_sir_self *self;
+
+
+	psir_ports = platform_get_drvdata(pdev);
+	if (!psir_ports)
+		return 0;
+	for (i = nr_sirs-1; i >= 0; i--) {
+		dev = (psir_ports+i)->dev;
+		self = dev->priv;
+		unregister_netdev(dev);
+		kfree(self->tx_buff.head);
+		kfree(self->rx_buff.head);
+		free_netdev(dev);
+	}
+	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@...log.com>");
+MODULE_DESCRIPTION("Blackfin IrDA driver");
+MODULE_LICENSE("GPL");
-- 
1.5.6
--
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