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Blackfin Serial Driver: Use timer to poll CTS PIN instead of workqueue.

Browse Source 
This allows other threads to run when the serial driver polls the CTS
PIN in a loop.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
This commit is contained in:
Sonic Zhang 2008-06-19 17:46:39 +08:00 committed by Bryan Wu
parent ec64b6c876
commit f30ac0ce34
6 changed files with 23 additions and 27 deletions
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40
drivers/serial/bfin_5xx.c
View File

@ -49,6 +49,7 @@
#define DMA_RX_YCOUNT (PAGE_SIZE / DMA_RX_XCOUNT)
#define DMA_RX_FLUSH_JIFFIES (HZ / 50)
#define CTS_CHECK_JIFFIES (HZ / 50)
#ifdef CONFIG_SERIAL_BFIN_DMA
static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart);
@ -290,11 +291,6 @@ static void bfin_serial_tx_chars(struct bfin_serial_port *uart)
{
struct circ_buf *xmit = &uart->port.info->xmit;
if (uart->port.x_char) {
UART_PUT_CHAR(uart, uart->port.x_char);
uart->port.icount.tx++;
uart->port.x_char = 0;
}
/*
* Check the modem control lines before
* transmitting anything.
@ -306,6 +302,12 @@ static void bfin_serial_tx_chars(struct bfin_serial_port *uart)
return;
}
if (uart->port.x_char) {
UART_PUT_CHAR(uart, uart->port.x_char);
uart->port.icount.tx++;
uart->port.x_char = 0;
}
while ((UART_GET_LSR(uart) & THRE) && xmit->tail != xmit->head) {
UART_PUT_CHAR(uart, xmit->buf[xmit->tail]);
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
@ -345,15 +347,6 @@ static irqreturn_t bfin_serial_tx_int(int irq, void *dev_id)
}
#endif
#ifdef CONFIG_SERIAL_BFIN_CTSRTS
static void bfin_serial_do_work(struct work_struct *work)
{
struct bfin_serial_port *uart = container_of(work, struct bfin_serial_port, cts_workqueue);
bfin_serial_mctrl_check(uart);
}
#endif
#ifdef CONFIG_SERIAL_BFIN_DMA
static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart)
{
@ -361,6 +354,12 @@ static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart)
uart->tx_done = 0;
/*
* Check the modem control lines before
* transmitting anything.
*/
bfin_serial_mctrl_check(uart);
if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
uart->tx_count = 0;
uart->tx_done = 1;
@ -373,12 +372,6 @@ static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart)
uart->port.x_char = 0;
}
/*
* Check the modem control lines before
* transmitting anything.
*/
bfin_serial_mctrl_check(uart);
uart->tx_count = CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE);
if (uart->tx_count > (UART_XMIT_SIZE - xmit->tail))
uart->tx_count = UART_XMIT_SIZE - xmit->tail;
@ -565,7 +558,10 @@ static void bfin_serial_mctrl_check(struct bfin_serial_port *uart)
uart_handle_cts_change(&uart->port, status & TIOCM_CTS);
if (!(status & TIOCM_CTS)) {
tty->hw_stopped = 1;
schedule_work(&uart->cts_workqueue);
uart->cts_timer.data = (unsigned long)(uart);
uart->cts_timer.function = (void *)bfin_serial_mctrl_check;
uart->cts_timer.expires = jiffies + CTS_CHECK_JIFFIES;
add_timer(&(uart->cts_timer));
} else {
tty->hw_stopped = 0;
}
@ -885,7 +881,7 @@ static void __init bfin_serial_init_ports(void)
init_timer(&(bfin_serial_ports[i].rx_dma_timer));
#endif
#ifdef CONFIG_SERIAL_BFIN_CTSRTS
INIT_WORK(&bfin_serial_ports[i].cts_workqueue, bfin_serial_do_work);
init_timer(&(bfin_serial_ports[i].cts_timer));
bfin_serial_ports[i].cts_pin =
bfin_serial_resource[i].uart_cts_pin;
bfin_serial_ports[i].rts_pin =

2
include/asm-blackfin/mach-bf527/bfin_serial_5xx.h
View File

@ -96,7 +96,7 @@ struct bfin_serial_port {
struct work_struct tx_dma_workqueue;
#endif
#ifdef CONFIG_SERIAL_BFIN_CTSRTS
struct work_struct cts_workqueue;
struct timer_list cts_timer;
int cts_pin;
int rts_pin;
#endif

2
include/asm-blackfin/mach-bf533/bfin_serial_5xx.h
View File

@ -88,7 +88,7 @@ struct bfin_serial_port {
# endif
#endif
#ifdef CONFIG_SERIAL_BFIN_CTSRTS
struct work_struct cts_workqueue;
struct timer_list cts_timer;
int cts_pin;
int rts_pin;
#endif

2
include/asm-blackfin/mach-bf537/bfin_serial_5xx.h
View File

@ -96,7 +96,7 @@ struct bfin_serial_port {
struct work_struct tx_dma_workqueue;
#endif
#ifdef CONFIG_SERIAL_BFIN_CTSRTS
struct work_struct cts_workqueue;
struct timer_list cts_timer;
int cts_pin;
int rts_pin;
#endif

2
include/asm-blackfin/mach-bf548/bfin_serial_5xx.h
View File

@ -99,7 +99,7 @@ struct bfin_serial_port {
struct work_struct tx_dma_workqueue;
#endif
#ifdef CONFIG_SERIAL_BFIN_CTSRTS
struct work_struct cts_workqueue;
struct timer_list cts_timer;
int cts_pin;
int rts_pin;
#endif

2
include/asm-blackfin/mach-bf561/bfin_serial_5xx.h
View File

@ -88,7 +88,7 @@ struct bfin_serial_port {
# endif
#endif
#ifdef CONFIG_SERIAL_BFIN_CTSRTS
struct work_struct cts_workqueue;
struct timer_list cts_timer;
int cts_pin;
int rts_pin;
#endif