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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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      Last update: 2009-03-10 08:41    [W:0.080 / U:4.336 seconds]
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