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irda: new Blackfin on-chip SIR IrDA driver 

Signed-off-by: Graff Yang <graff.yang@gmail.com>
Cc: Mike Frysinger <vapier@gentoo.org>
Cc: Bryan Wu <bryan.wu@analog.com>
Signed-off-by: Samuel Ortiz <samuel@sortiz.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Graff Yang 2009-05-12 13:47:54 -07:00 committed by Samuel Ortiz
parent 8981f01001
commit d510fe70db
4 changed files with 1014 additions and 0 deletions
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45
drivers/net/irda/Kconfig
View File

@ -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

1
drivers/net/irda/Makefile
View File

@ -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

820
drivers/net/irda/bfin_sir.c Normal file
View File

@ -0,0 +1,820 @@
/*
* Blackfin Infra-red Driver
*
* Copyright 2006-2009 Analog Devices Inc.
*
* Enter bugs at http://blackfin.uclinux.org/
*
* Licensed under the GPL-2 or later.
*
*/
#include "bfin_sir.h"
#ifdef CONFIG_SIR_BFIN_DMA
#define DMA_SIR_RX_XCNT 10
#define DMA_SIR_RX_YCNT (PAGE_SIZE / DMA_SIR_RX_XCNT)
#define DMA_SIR_RX_FLUSH_JIFS (HZ * 4 / 250)
#endif
#if ANOMALY_05000447
static int max_rate = 57600;
#else
static int max_rate = 115200;
#endif
static void turnaround_delay(unsigned long last_jif, int mtt)
{
long ticks;
mtt = mtt < 10000 ? 10000 : mtt;
ticks = 1 + mtt / (USEC_PER_SEC / HZ);
schedule_timeout_uninterruptible(ticks);
}
static void __devinit bfin_sir_init_ports(struct bfin_sir_port *sp, struct platform_device *pdev)
{
int i;
struct resource *res;
for (i = 0; i < pdev->num_resources; i++) {
res = &pdev->resource[i];
switch (res->flags) {
case IORESOURCE_MEM:
sp->membase = (void __iomem *)res->start;
break;
case IORESOURCE_IRQ:
sp->irq = res->start;
break;
case IORESOURCE_DMA:
sp->rx_dma_channel = res->start;
sp->tx_dma_channel = res->end;
break;
default:
break;
}
}
sp->clk = get_sclk();
#ifdef CONFIG_SIR_BFIN_DMA
sp->tx_done = 1;
init_timer(&(sp->rx_dma_timer));
#endif
}
static void bfin_sir_stop_tx(struct bfin_sir_port *port)
{
#ifdef CONFIG_SIR_BFIN_DMA
disable_dma(port->tx_dma_channel);
#endif
while (!(SIR_UART_GET_LSR(port) & THRE)) {
cpu_relax();
continue;
}
SIR_UART_STOP_TX(port);
}
static void bfin_sir_enable_tx(struct bfin_sir_port *port)
{
SIR_UART_ENABLE_TX(port);
}
static void bfin_sir_stop_rx(struct bfin_sir_port *port)
{
SIR_UART_STOP_RX(port);
}
static void bfin_sir_enable_rx(struct bfin_sir_port *port)
{
SIR_UART_ENABLE_RX(port);
}
static int bfin_sir_set_speed(struct bfin_sir_port *port, int speed)
{
int ret = -EINVAL;
unsigned int quot;
unsigned short val, lsr, lcr;
static int utime;
int count = 10;
lcr = WLS(8);
switch (speed) {
case 9600:
case 19200:
case 38400:
case 57600:
case 115200:
quot = (port->clk + (8 * speed)) / (16 * speed)\
- ANOMALY_05000230;
do {
udelay(utime);
lsr = SIR_UART_GET_LSR(port);
} while (!(lsr & TEMT) && count--);
/* The useconds for 1 bits to transmit */
utime = 1000000 / speed + 1;
/* Clear UCEN bit to reset the UART state machine
* and control registers
*/
val = SIR_UART_GET_GCTL(port);
val &= ~UCEN;
SIR_UART_PUT_GCTL(port, val);
/* Set DLAB in LCR to Access THR RBR IER */
SIR_UART_SET_DLAB(port);
SSYNC();
SIR_UART_PUT_DLL(port, quot & 0xFF);
SIR_UART_PUT_DLH(port, (quot >> 8) & 0xFF);
SSYNC();
/* Clear DLAB in LCR */
SIR_UART_CLEAR_DLAB(port);
SSYNC();
SIR_UART_PUT_LCR(port, lcr);
val = SIR_UART_GET_GCTL(port);
val |= UCEN;
SIR_UART_PUT_GCTL(port, val);
ret = 0;
break;
default:
printk(KERN_WARNING "bfin_sir: Invalid speed %d\n", speed);
break;
}
val = SIR_UART_GET_GCTL(port);
/* If not add the 'RPOLC', we can't catch the receive interrupt.
* It's related with the HW layout and the IR transiver.
*/
val |= IREN | RPOLC;
SIR_UART_PUT_GCTL(port, val);
return ret;
}
static int bfin_sir_is_receiving(struct net_device *dev)
{
struct bfin_sir_self *self = netdev_priv(dev);
struct bfin_sir_port *port = self->sir_port;
if (!(SIR_UART_GET_IER(port) & ERBFI))
return 0;
return self->rx_buff.state != OUTSIDE_FRAME;
}
#ifdef CONFIG_SIR_BFIN_PIO
static void bfin_sir_tx_chars(struct net_device *dev)
{
unsigned int chr;
struct bfin_sir_self *self = netdev_priv(dev);
struct bfin_sir_port *port = self->sir_port;
if (self->tx_buff.len != 0) {
chr = *(self->tx_buff.data);
SIR_UART_PUT_CHAR(port, chr);
self->tx_buff.data++;
self->tx_buff.len--;
} else {
self->stats.tx_packets++;
self->stats.tx_bytes += self->tx_buff.data - self->tx_buff.head;
if (self->newspeed) {
bfin_sir_set_speed(port, self->newspeed);
self->speed = self->newspeed;
self->newspeed = 0;
}
bfin_sir_stop_tx(port);
bfin_sir_enable_rx(port);
/* I'm hungry! */
netif_wake_queue(dev);
}
}
static void bfin_sir_rx_chars(struct net_device *dev)
{
struct bfin_sir_self *self = netdev_priv(dev);
struct bfin_sir_port *port = self->sir_port;
unsigned char ch;
SIR_UART_CLEAR_LSR(port);
ch = SIR_UART_GET_CHAR(port);
async_unwrap_char(dev, &self->stats, &self->rx_buff, ch);
dev->last_rx = jiffies;
}
static irqreturn_t bfin_sir_rx_int(int irq, void *dev_id)
{
struct net_device *dev = dev_id;
struct bfin_sir_self *self = netdev_priv(dev);
struct bfin_sir_port *port = self->sir_port;
spin_lock(&self->lock);
while ((SIR_UART_GET_LSR(port) & DR))
bfin_sir_rx_chars(dev);
spin_unlock(&self->lock);
return IRQ_HANDLED;
}
static irqreturn_t bfin_sir_tx_int(int irq, void *dev_id)
{
struct net_device *dev = dev_id;
struct bfin_sir_self *self = netdev_priv(dev);
struct bfin_sir_port *port = self->sir_port;
spin_lock(&self->lock);
if (SIR_UART_GET_LSR(port) & THRE)
bfin_sir_tx_chars(dev);
spin_unlock(&self->lock);
return IRQ_HANDLED;
}
#endif /* CONFIG_SIR_BFIN_PIO */
#ifdef CONFIG_SIR_BFIN_DMA
static void bfin_sir_dma_tx_chars(struct net_device *dev)
{
struct bfin_sir_self *self = netdev_priv(dev);
struct bfin_sir_port *port = self->sir_port;
if (!port->tx_done)
return;
port->tx_done = 0;
if (self->tx_buff.len == 0) {
self->stats.tx_packets++;
if (self->newspeed) {
bfin_sir_set_speed(port, self->newspeed);
self->speed = self->newspeed;
self->newspeed = 0;
}
bfin_sir_enable_rx(port);
port->tx_done = 1;
netif_wake_queue(dev);
return;
}
blackfin_dcache_flush_range((unsigned long)(self->tx_buff.data),
(unsigned long)(self->tx_buff.data+self->tx_buff.len));
set_dma_config(port->tx_dma_channel,
set_bfin_dma_config(DIR_READ, DMA_FLOW_STOP,
INTR_ON_BUF, DIMENSION_LINEAR, DATA_SIZE_8,
DMA_SYNC_RESTART));
set_dma_start_addr(port->tx_dma_channel,
(unsigned long)(self->tx_buff.data));
set_dma_x_count(port->tx_dma_channel, self->tx_buff.len);
set_dma_x_modify(port->tx_dma_channel, 1);
enable_dma(port->tx_dma_channel);
}
static irqreturn_t bfin_sir_dma_tx_int(int irq, void *dev_id)
{
struct net_device *dev = dev_id;
struct bfin_sir_self *self = netdev_priv(dev);
struct bfin_sir_port *port = self->sir_port;
spin_lock(&self->lock);
if (!(get_dma_curr_irqstat(port->tx_dma_channel) & DMA_RUN)) {
clear_dma_irqstat(port->tx_dma_channel);
bfin_sir_stop_tx(port);
self->stats.tx_packets++;
self->stats.tx_bytes += self->tx_buff.len;
self->tx_buff.len = 0;
if (self->newspeed) {
bfin_sir_set_speed(port, self->newspeed);
self->speed = self->newspeed;
self->newspeed = 0;
}
bfin_sir_enable_rx(port);
/* I'm hungry! */
netif_wake_queue(dev);
port->tx_done = 1;
}
spin_unlock(&self->lock);
return IRQ_HANDLED;
}
static void bfin_sir_dma_rx_chars(struct net_device *dev)
{
struct bfin_sir_self *self = netdev_priv(dev);
struct bfin_sir_port *port = self->sir_port;
int i;
SIR_UART_CLEAR_LSR(port);
for (i = port->rx_dma_buf.head; i < port->rx_dma_buf.tail; i++)
async_unwrap_char(dev, &self->stats, &self->rx_buff, port->rx_dma_buf.buf[i]);
}
void bfin_sir_rx_dma_timeout(struct net_device *dev)
{
struct bfin_sir_self *self = netdev_priv(dev);
struct bfin_sir_port *port = self->sir_port;
int x_pos, pos;
unsigned long flags;
spin_lock_irqsave(&self->lock, flags);
x_pos = DMA_SIR_RX_XCNT - get_dma_curr_xcount(port->rx_dma_channel);
if (x_pos == DMA_SIR_RX_XCNT)
x_pos = 0;
pos = port->rx_dma_nrows * DMA_SIR_RX_XCNT + x_pos;
if (pos > port->rx_dma_buf.tail) {
port->rx_dma_buf.tail = pos;
bfin_sir_dma_rx_chars(dev);
port->rx_dma_buf.head = port->rx_dma_buf.tail;
}
spin_unlock_irqrestore(&self->lock, flags);
}
static irqreturn_t bfin_sir_dma_rx_int(int irq, void *dev_id)
{
struct net_device *dev = dev_id;
struct bfin_sir_self *self = netdev_priv(dev);
struct bfin_sir_port *port = self->sir_port;
unsigned short irqstat;
spin_lock(&self->lock);
port->rx_dma_nrows++;
port->rx_dma_buf.tail = DMA_SIR_RX_XCNT * port->rx_dma_nrows;
bfin_sir_dma_rx_chars(dev);
if (port->rx_dma_nrows >= DMA_SIR_RX_YCNT) {
port->rx_dma_nrows = 0;
port->rx_dma_buf.tail = 0;
}
port->rx_dma_buf.head = port->rx_dma_buf.tail;
irqstat = get_dma_curr_irqstat(port->rx_dma_channel);
clear_dma_irqstat(port->rx_dma_channel);
spin_unlock(&self->lock);
mod_timer(&port->rx_dma_timer, jiffies + DMA_SIR_RX_FLUSH_JIFS);
return IRQ_HANDLED;
}
#endif /* CONFIG_SIR_BFIN_DMA */
static int bfin_sir_startup(struct bfin_sir_port *port, struct net_device *dev)
{
#ifdef CONFIG_SIR_BFIN_DMA
dma_addr_t dma_handle;
#endif /* CONFIG_SIR_BFIN_DMA */
if (request_dma(port->rx_dma_channel, "BFIN_UART_RX") < 0) {
dev_warn(&dev->dev, "Unable to attach SIR RX DMA channel\n");
return -EBUSY;
}
if (request_dma(port->tx_dma_channel, "BFIN_UART_TX") < 0) {
dev_warn(&dev->dev, "Unable to attach SIR TX DMA channel\n");
free_dma(port->rx_dma_channel);
return -EBUSY;
}
#ifdef CONFIG_SIR_BFIN_DMA
set_dma_callback(port->rx_dma_channel, bfin_sir_dma_rx_int, dev);
set_dma_callback(port->tx_dma_channel, bfin_sir_dma_tx_int, dev);
port->rx_dma_buf.buf = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_DMA);
port->rx_dma_buf.head = 0;
port->rx_dma_buf.tail = 0;
port->rx_dma_nrows = 0;
set_dma_config(port->rx_dma_channel,
set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO,
INTR_ON_ROW, DIMENSION_2D,
DATA_SIZE_8, DMA_SYNC_RESTART));
set_dma_x_count(port->rx_dma_channel, DMA_SIR_RX_XCNT);
set_dma_x_modify(port->rx_dma_channel, 1);
set_dma_y_count(port->rx_dma_channel, DMA_SIR_RX_YCNT);
set_dma_y_modify(port->rx_dma_channel, 1);
set_dma_start_addr(port->rx_dma_channel, (unsigned long)port->rx_dma_buf.buf);
enable_dma(port->rx_dma_channel);
port->rx_dma_timer.data = (unsigned long)(dev);
port->rx_dma_timer.function = (void *)bfin_sir_rx_dma_timeout;
#else
if (request_irq(port->irq, bfin_sir_rx_int, IRQF_DISABLED, "BFIN_SIR_RX", dev)) {
dev_warn(&dev->dev, "Unable to attach SIR RX interrupt\n");
return -EBUSY;
}
if (request_irq(port->irq+1, bfin_sir_tx_int, IRQF_DISABLED, "BFIN_SIR_TX", dev)) {
dev_warn(&dev->dev, "Unable to attach SIR TX interrupt\n");
free_irq(port->irq, dev);
return -EBUSY;
}
#endif
return 0;
}
static void bfin_sir_shutdown(struct bfin_sir_port *port, struct net_device *dev)
{
unsigned short val;
bfin_sir_stop_rx(port);
SIR_UART_DISABLE_INTS(port);
val = SIR_UART_GET_GCTL(port);
val &= ~(UCEN | IREN | RPOLC);
SIR_UART_PUT_GCTL(port, val);
#ifdef CONFIG_SIR_BFIN_DMA
disable_dma(port->tx_dma_channel);
disable_dma(port->rx_dma_channel);
del_timer(&(port->rx_dma_timer));
dma_free_coherent(NULL, PAGE_SIZE, port->rx_dma_buf.buf, 0);
#else
free_irq(port->irq+1, dev);
free_irq(port->irq, dev);
#endif
free_dma(port->tx_dma_channel);
free_dma(port->rx_dma_channel);
}
#ifdef CONFIG_PM
static int bfin_sir_suspend(struct platform_device *pdev, pm_message_t state)
{
struct bfin_sir_port *sir_port;
struct net_device *dev;
struct bfin_sir_self *self;
sir_port = platform_get_drvdata(pdev);
if (!sir_port)
return 0;
dev = sir_port->dev;
self = netdev_priv(dev);
if (self->open) {
flush_work(&self->work);
bfin_sir_shutdown(self->sir_port, dev);
netif_device_detach(dev);
}
return 0;
}
static int bfin_sir_resume(struct platform_device *pdev)
{
struct bfin_sir_port *sir_port;
struct net_device *dev;
struct bfin_sir_self *self;
struct bfin_sir_port *port;
sir_port = platform_get_drvdata(pdev);
if (!sir_port)
return 0;
dev = sir_port->dev;
self = netdev_priv(dev);
port = self->sir_port;
if (self->open) {
if (self->newspeed) {
self->speed = self->newspeed;
self->newspeed = 0;
}
bfin_sir_startup(port, dev);
bfin_sir_set_speed(port, 9600);
bfin_sir_enable_rx(port);
netif_device_attach(dev);
}
return 0;
}
#else
#define bfin_sir_suspend NULL
#define bfin_sir_resume NULL
#endif
static void bfin_sir_send_work(struct work_struct *work)
{
struct bfin_sir_self *self = container_of(work, struct bfin_sir_self, work);
struct net_device *dev = self->sir_port->dev;
struct bfin_sir_port *port = self->sir_port;
unsigned short val;
int tx_cnt = 10;
while (bfin_sir_is_receiving(dev) && --tx_cnt)
turnaround_delay(dev->last_rx, self->mtt);
bfin_sir_stop_rx(port);
/* To avoid losting RX interrupt, we reset IR function before
* sending data. We also can set the speed, which will
* reset all the UART.
*/
val = SIR_UART_GET_GCTL(port);
val &= ~(IREN | RPOLC);
SIR_UART_PUT_GCTL(port, val);
SSYNC();
val |= IREN | RPOLC;
SIR_UART_PUT_GCTL(port, val);
SSYNC();
/* bfin_sir_set_speed(port, self->speed); */
#ifdef CONFIG_SIR_BFIN_DMA
bfin_sir_dma_tx_chars(dev);
#endif
bfin_sir_enable_tx(port);
dev->trans_start = jiffies;
}
static int bfin_sir_hard_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct bfin_sir_self *self = netdev_priv(dev);
int speed = irda_get_next_speed(skb);
netif_stop_queue(dev);
self->mtt = irda_get_mtt(skb);
if (speed != self->speed && speed != -1)
self->newspeed = speed;
self->tx_buff.data = self->tx_buff.head;
if (skb->len == 0)
self->tx_buff.len = 0;
else
self->tx_buff.len = async_wrap_skb(skb, self->tx_buff.data, self->tx_buff.truesize);
schedule_work(&self->work);
dev_kfree_skb(skb);
return 0;
}
static int bfin_sir_ioctl(struct net_device *dev, struct ifreq *ifreq, int cmd)
{
struct if_irda_req *rq = (struct if_irda_req *)ifreq;
struct bfin_sir_self *self = netdev_priv(dev);
struct bfin_sir_port *port = self->sir_port;
int ret = 0;
switch (cmd) {
case SIOCSBANDWIDTH:
if (capable(CAP_NET_ADMIN)) {
if (self->open) {
ret = bfin_sir_set_speed(port, rq->ifr_baudrate);
bfin_sir_enable_rx(port);
} else {
dev_warn(&dev->dev, "SIOCSBANDWIDTH: !netif_running\n");
ret = 0;
}
}
break;
case SIOCSMEDIABUSY:
ret = -EPERM;
if (capable(CAP_NET_ADMIN)) {
irda_device_set_media_busy(dev, TRUE);
ret = 0;
}
break;
case SIOCGRECEIVING:
rq->ifr_receiving = bfin_sir_is_receiving(dev);
break;
default:
ret = -EOPNOTSUPP;
break;
}
return ret;
}
static struct net_device_stats *bfin_sir_stats(struct net_device *dev)
{
struct bfin_sir_self *self = netdev_priv(dev);
return &self->stats;
}
static int bfin_sir_open(struct net_device *dev)
{
struct bfin_sir_self *self = netdev_priv(dev);
struct bfin_sir_port *port = self->sir_port;
int err = -ENOMEM;
self->newspeed = 0;
self->speed = 9600;
spin_lock_init(&self->lock);
err = bfin_sir_startup(port, dev);
if (err)
goto err_startup;
bfin_sir_set_speed(port, 9600);
self->irlap = irlap_open(dev, &self->qos, DRIVER_NAME);
if (!self->irlap)
goto err_irlap;
INIT_WORK(&self->work, bfin_sir_send_work);
/*
* Now enable the interrupt then start the queue
*/
self->open = 1;
bfin_sir_enable_rx(port);
netif_start_queue(dev);
return 0;
err_irlap:
self->open = 0;
bfin_sir_shutdown(port, dev);
err_startup:
return err;
}
static int bfin_sir_stop(struct net_device *dev)
{
struct bfin_sir_self *self = netdev_priv(dev);
flush_work(&self->work);
bfin_sir_shutdown(self->sir_port, dev);
if (self->rxskb) {
dev_kfree_skb(self->rxskb);
self->rxskb = NULL;
}
/* Stop IrLAP */
if (self->irlap) {
irlap_close(self->irlap);
self->irlap = NULL;
}
netif_stop_queue(dev);
self->open = 0;
return 0;
}
static int bfin_sir_init_iobuf(iobuff_t *io, int size)
{
io->head = kmalloc(size, GFP_KERNEL);
if (!io->head)
return -ENOMEM;
io->truesize = size;
io->in_frame = FALSE;
io->state = OUTSIDE_FRAME;
io->data = io->head;
return 0;
}
static int __devinit bfin_sir_probe(struct platform_device *pdev)
{
struct net_device *dev;
struct bfin_sir_self *self;
unsigned int baudrate_mask;
struct bfin_sir_port *sir_port;
int err;
if (pdev->id >= 0 && pdev->id < ARRAY_SIZE(per) && \
per[pdev->id][3] == pdev->id) {
err = peripheral_request_list(per[pdev->id], DRIVER_NAME);
if (err)
return err;
} else {
dev_err(&pdev->dev, "Invalid pdev id, please check board file\n");
return -ENODEV;
}
err = -ENOMEM;
sir_port = kmalloc(sizeof(*sir_port), GFP_KERNEL);
if (!sir_port)
goto err_mem_0;
bfin_sir_init_ports(sir_port, pdev);
dev = alloc_irdadev(sizeof(*self));
if (!dev)
goto err_mem_1;
self = netdev_priv(dev);
self->dev = &pdev->dev;
self->sir_port = sir_port;
sir_port->dev = dev;
err = bfin_sir_init_iobuf(&self->rx_buff, IRDA_SKB_MAX_MTU);
if (err)
goto err_mem_2;
err = bfin_sir_init_iobuf(&self->tx_buff, IRDA_SIR_MAX_FRAME);
if (err)
goto err_mem_3;
dev->hard_start_xmit = bfin_sir_hard_xmit;
dev->open = bfin_sir_open;
dev->stop = bfin_sir_stop;
dev->do_ioctl = bfin_sir_ioctl;
dev->get_stats = bfin_sir_stats;
dev->irq = sir_port->irq;
irda_init_max_qos_capabilies(&self->qos);
baudrate_mask = IR_9600;
switch (max_rate) {
case 115200:
baudrate_mask |= IR_115200;
case 57600:
baudrate_mask |= IR_57600;
case 38400:
baudrate_mask |= IR_38400;
case 19200:
baudrate_mask |= IR_19200;
case 9600:
break;
default:
dev_warn(&pdev->dev, "Invalid maximum baud rate, using 9600\n");
}
self->qos.baud_rate.bits &= baudrate_mask;
self->qos.min_turn_time.bits = 1; /* 10 ms or more */
irda_qos_bits_to_value(&self->qos);
err = register_netdev(dev);
if (err) {
kfree(self->tx_buff.head);
err_mem_3:
kfree(self->rx_buff.head);
err_mem_2:
free_netdev(dev);
err_mem_1:
kfree(sir_port);
err_mem_0:
peripheral_free_list(per[pdev->id]);
} else
platform_set_drvdata(pdev, sir_port);
return err;
}
static int __devexit bfin_sir_remove(struct platform_device *pdev)
{
struct bfin_sir_port *sir_port;
struct net_device *dev = NULL;
struct bfin_sir_self *self;
sir_port = platform_get_drvdata(pdev);
if (!sir_port)
return 0;
dev = sir_port->dev;
self = netdev_priv(dev);
unregister_netdev(dev);
kfree(self->tx_buff.head);
kfree(self->rx_buff.head);
free_netdev(dev);
kfree(sir_port);
platform_set_drvdata(pdev, NULL);
return 0;
}
static struct platform_driver bfin_ir_driver = {
.probe = bfin_sir_probe,
.remove = __devexit_p(bfin_sir_remove),
.suspend = bfin_sir_suspend,
.resume = bfin_sir_resume,
.driver = {
.name = DRIVER_NAME,
},
};
static int __init bfin_sir_init(void)
{
return platform_driver_register(&bfin_ir_driver);
}
static void __exit bfin_sir_exit(void)
{
platform_driver_unregister(&bfin_ir_driver);
}
module_init(bfin_sir_init);
module_exit(bfin_sir_exit);
module_param(max_rate, int, 0);
MODULE_PARM_DESC(max_rate, "Maximum baud rate (115200, 57600, 38400, 19200, 9600)");
MODULE_AUTHOR("Graf Yang <graf.yang@analog.com>");
MODULE_DESCRIPTION("Blackfin IrDA driver");
MODULE_LICENSE("GPL");

148
drivers/net/irda/bfin_sir.h Normal file
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@ -0,0 +1,148 @@
/*
* Blackfin Infra-red Driver
*
* Copyright 2006-2009 Analog Devices Inc.
*
* Enter bugs at http://blackfin.uclinux.org/
*
* Licensed under the GPL-2 or later.
*
*/
#include <linux/serial.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <net/irda/irda.h>
#include <net/irda/wrapper.h>
#include <net/irda/irda_device.h>
#include <asm/irq.h>
#include <asm/cacheflush.h>
#include <asm/dma.h>
#include <asm/portmux.h>
#ifdef CONFIG_SIR_BFIN_DMA
struct dma_rx_buf {
char *buf;
int head;
int tail;
};
#endif
struct bfin_sir_port {
unsigned char __iomem *membase;
unsigned int irq;
unsigned int lsr;
unsigned long clk;
struct net_device *dev;
#ifdef CONFIG_SIR_BFIN_DMA
int tx_done;
struct dma_rx_buf rx_dma_buf;
struct timer_list rx_dma_timer;
int rx_dma_nrows;
#endif
unsigned int tx_dma_channel;
unsigned int rx_dma_channel;
};
struct bfin_sir_port_res {
unsigned long base_addr;
int irq;
unsigned int rx_dma_channel;
unsigned int tx_dma_channel;
};
struct bfin_sir_self {
struct bfin_sir_port *sir_port;
spinlock_t lock;
unsigned int open;
int speed;
int newspeed;
struct sk_buff *txskb;
struct sk_buff *rxskb;
struct net_device_stats stats;
struct device *dev;
struct irlap_cb *irlap;
struct qos_info qos;
iobuff_t tx_buff;
iobuff_t rx_buff;
struct work_struct work;
int mtt;
};
#define DRIVER_NAME "bfin_sir"
#define SIR_UART_GET_CHAR(port) bfin_read16((port)->membase + OFFSET_RBR)
#define SIR_UART_GET_DLL(port) bfin_read16((port)->membase + OFFSET_DLL)
#define SIR_UART_GET_DLH(port) bfin_read16((port)->membase + OFFSET_DLH)
#define SIR_UART_GET_LCR(port) bfin_read16((port)->membase + OFFSET_LCR)
#define SIR_UART_GET_GCTL(port) bfin_read16((port)->membase + OFFSET_GCTL)
#define SIR_UART_PUT_CHAR(port, v) bfin_write16(((port)->membase + OFFSET_THR), v)
#define SIR_UART_PUT_DLL(port, v) bfin_write16(((port)->membase + OFFSET_DLL), v)
#define SIR_UART_PUT_DLH(port, v) bfin_write16(((port)->membase + OFFSET_DLH), v)
#define SIR_UART_PUT_LCR(port, v) bfin_write16(((port)->membase + OFFSET_LCR), v)
#define SIR_UART_PUT_GCTL(port, v) bfin_write16(((port)->membase + OFFSET_GCTL), v)
#ifdef CONFIG_BF54x
#define SIR_UART_GET_LSR(port) bfin_read16((port)->membase + OFFSET_LSR)
#define SIR_UART_GET_IER(port) bfin_read16((port)->membase + OFFSET_IER_SET)
#define SIR_UART_SET_IER(port, v) bfin_write16(((port)->membase + OFFSET_IER_SET), v)
#define SIR_UART_CLEAR_IER(port, v) bfin_write16(((port)->membase + OFFSET_IER_CLEAR), v)
#define SIR_UART_PUT_LSR(port, v) bfin_write16(((port)->membase + OFFSET_LSR), v)
#define SIR_UART_CLEAR_LSR(port) bfin_write16(((port)->membase + OFFSET_LSR), -1)
#define SIR_UART_SET_DLAB(port)
#define SIR_UART_CLEAR_DLAB(port)
#define SIR_UART_ENABLE_INTS(port, v) SIR_UART_SET_IER(port, v)
#define SIR_UART_DISABLE_INTS(port) SIR_UART_CLEAR_IER(port, 0xF)
#define SIR_UART_STOP_TX(port) do { SIR_UART_PUT_LSR(port, TFI); SIR_UART_CLEAR_IER(port, ETBEI); } while (0)
#define SIR_UART_ENABLE_TX(port) do { SIR_UART_SET_IER(port, ETBEI); } while (0)
#define SIR_UART_STOP_RX(port) do { SIR_UART_CLEAR_IER(port, ERBFI); } while (0)
#define SIR_UART_ENABLE_RX(port) do { SIR_UART_SET_IER(port, ERBFI); } while (0)
#else
#define SIR_UART_GET_IIR(port) bfin_read16((port)->membase + OFFSET_IIR)
#define SIR_UART_GET_IER(port) bfin_read16((port)->membase + OFFSET_IER)
#define SIR_UART_PUT_IER(port, v) bfin_write16(((port)->membase + OFFSET_IER), v)
#define SIR_UART_SET_DLAB(port) do { SIR_UART_PUT_LCR(port, SIR_UART_GET_LCR(port) | DLAB); } while (0)
#define SIR_UART_CLEAR_DLAB(port) do { SIR_UART_PUT_LCR(port, SIR_UART_GET_LCR(port) & ~DLAB); } while (0)
#define SIR_UART_ENABLE_INTS(port, v) SIR_UART_PUT_IER(port, v)
#define SIR_UART_DISABLE_INTS(port) SIR_UART_PUT_IER(port, 0)
#define SIR_UART_STOP_TX(port) do { SIR_UART_PUT_IER(port, SIR_UART_GET_IER(port) & ~ETBEI); } while (0)
#define SIR_UART_ENABLE_TX(port) do { SIR_UART_PUT_IER(port, SIR_UART_GET_IER(port) | ETBEI); } while (0)
#define SIR_UART_STOP_RX(port) do { SIR_UART_PUT_IER(port, SIR_UART_GET_IER(port) & ~ERBFI); } while (0)
#define SIR_UART_ENABLE_RX(port) do { SIR_UART_PUT_IER(port, SIR_UART_GET_IER(port) | ERBFI); } while (0)
static inline unsigned int SIR_UART_GET_LSR(struct bfin_sir_port *port)
{
unsigned int lsr = bfin_read16(port->membase + OFFSET_LSR);
port->lsr |= (lsr & (BI|FE|PE|OE));
return lsr | port->lsr;
}
static inline void SIR_UART_CLEAR_LSR(struct bfin_sir_port *port)
{
port->lsr = 0;
bfin_read16(port->membase + OFFSET_LSR);
}
#endif
static const unsigned short per[][4] = {
/* rx pin tx pin NULL uart_number */
{P_UART0_RX, P_UART0_TX, 0, 0},
{P_UART1_RX, P_UART1_TX, 0, 1},
{P_UART2_RX, P_UART2_TX, 0, 2},
{P_UART3_RX, P_UART3_TX, 0, 3},
};