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Subject[PATCH] [net/irda]: new Blackfin on-chip SIR IrDA driver
Date
From: Graff Yang <graff.yang@gmail.com>

Signed-off-by: Graff Yang <graff.yang@gmail.com>
---
drivers/net/irda/Kconfig | 45 +++
drivers/net/irda/Makefile | 1 +
drivers/net/irda/bfin_sir.c | 806 +++++++++++++++++++++++++++++++++++++++++++
drivers/net/irda/bfin_sir.h | 147 ++++++++
4 files changed, 999 insertions(+), 0 deletions(-)
create mode 100644 drivers/net/irda/bfin_sir.c
create mode 100644 drivers/net/irda/bfin_sir.h
diff --git a/drivers/net/irda/Kconfig b/drivers/net/irda/Kconfig
index e631755..3b6f7d6 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_SIR3
+ bool "Blackfin SIR on UART3"
+ depends on BFIN_SIR && !SERIAL_BFIN_UART3 && (BF54x)
+
+config BFIN_SIR1
+ bool "Blackfin SIR on UART1"
+ depends on BFIN_SIR && !SERIAL_BFIN_UART1 && (!BF531 && !BF532 && !BF533 && !BF561)
+
+config BFIN_SIR0
+ bool "Blackfin SIR on UART0"
+ depends on BFIN_SIR && !SERIAL_BFIN_UART0
+
+config BFIN_SIR2
+ bool "Blackfin SIR on UART2"
+ depends on BFIN_SIR && !SERIAL_BFIN_UART2 && (BF54x || BF538 || BF539)
+
+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 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..16d3323
--- /dev/null
+++ b/drivers/net/irda/bfin_sir.c
@@ -0,0 +1,806 @@
+/*
+ * 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 "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 = 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);
+
+ /* Set DLAB in LCR to Access THR RBR IER */
+ SIR_UART_SET_DLAB(port);
+ SSYNC();
+
+ SIR_UART_PUT_DLL(port, quot & 0xFF);
+ SSYNC();
+ 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;
+ /*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 = 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) {
+ 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);
+ 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 {
+ 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 = 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 = 0;
+
+ err = peripheral_request(per[pdev->id][0], DRIVER_NAME);
+ if (err)
+ return err;
+ err = peripheral_request(per[pdev->id][1], DRIVER_NAME);
+ if (err)
+ return err;
+
+ sir_port = kmalloc(sizeof(struct bfin_sir_port), GFP_KERNEL);
+ if (!sir_port)
+ goto err_mem_0;
+
+ bfin_sir_init_ports(sir_port, pdev);
+
+ dev = alloc_irdadev(sizeof(struct bfin_sir_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;
+ }
+
+ 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);
+err_mem_0:
+ kfree(sir_port);
+ }
+ if (err == 0)
+ 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 0000000..9421792
--- /dev/null
+++ b/drivers/net/irda/bfin_sir.h
@@ -0,0 +1,147 @@
+/*
+ * 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/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 unsigned short per[][2] = {
+ {P_UART0_RX, P_UART0_TX},
+ {P_UART1_RX, P_UART1_TX},
+ {P_UART2_RX, P_UART2_TX},
+ {P_UART3_RX, P_UART3_TX},
+ };
--
1.6.1

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