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Change hardware flow control from poll to interrupt driven

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Only the CTS bit is affected.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Sonic Zhang 2009-04-07 16:51:15 +01:00 committed by Linus Torvalds
parent 1dcb884ca8
commit 6f95570e40
6 changed files with 84 additions and 189 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
arch/blackfin/mach-bf527/include/mach/bfin_serial_5xx.h
View File

@ -167,29 +167,3 @@ struct bfin_serial_res bfin_serial_resource[] = {
};
#define DRIVER_NAME "bfin-uart"
static void bfin_serial_hw_init(struct bfin_serial_port *uart)
{
#ifdef CONFIG_SERIAL_BFIN_UART0
peripheral_request(P_UART0_TX, DRIVER_NAME);
peripheral_request(P_UART0_RX, DRIVER_NAME);
#endif
#ifdef CONFIG_SERIAL_BFIN_UART1
peripheral_request(P_UART1_TX, DRIVER_NAME);
peripheral_request(P_UART1_RX, DRIVER_NAME);
#endif
#ifdef CONFIG_SERIAL_BFIN_CTSRTS
if (uart->cts_pin >= 0) {
gpio_request(uart->cts_pin, DRIVER_NAME);
gpio_direction_input(uart->cts_pin);
}
if (uart->rts_pin >= 0) {
gpio_request(uart->rts_pin, DRIVER_NAME);
gpio_direction_output(uart->rts_pin, 0);
}
#endif
}

20
arch/blackfin/mach-bf533/include/mach/bfin_serial_5xx.h
View File

@ -142,23 +142,3 @@ struct bfin_serial_res bfin_serial_resource[] = {
};
#define DRIVER_NAME "bfin-uart"
static void bfin_serial_hw_init(struct bfin_serial_port *uart)
{
#ifdef CONFIG_SERIAL_BFIN_UART0
peripheral_request(P_UART0_TX, DRIVER_NAME);
peripheral_request(P_UART0_RX, DRIVER_NAME);
#endif
#ifdef CONFIG_SERIAL_BFIN_CTSRTS
if (uart->cts_pin >= 0) {
gpio_request(uart->cts_pin, DRIVER_NAME);
gpio_direction_input(uart->cts_pin);
}
if (uart->rts_pin >= 0) {
gpio_request(uart->rts_pin, DRIVER_NAME);
gpio_direction_output(uart->rts_pin, 0);
}
#endif
}

27
arch/blackfin/mach-bf537/include/mach/bfin_serial_5xx.h
View File

@ -99,7 +99,6 @@ struct bfin_serial_port {
struct work_struct tx_dma_workqueue;
#endif
#ifdef CONFIG_SERIAL_BFIN_CTSRTS
struct timer_list cts_timer;
int cts_pin;
int rts_pin;
#endif
@ -167,29 +166,3 @@ struct bfin_serial_res bfin_serial_resource[] = {
};
#define DRIVER_NAME "bfin-uart"
static void bfin_serial_hw_init(struct bfin_serial_port *uart)
{
#ifdef CONFIG_SERIAL_BFIN_UART0
peripheral_request(P_UART0_TX, DRIVER_NAME);
peripheral_request(P_UART0_RX, DRIVER_NAME);
#endif
#ifdef CONFIG_SERIAL_BFIN_UART1
peripheral_request(P_UART1_TX, DRIVER_NAME);
peripheral_request(P_UART1_RX, DRIVER_NAME);
#endif
#ifdef CONFIG_SERIAL_BFIN_CTSRTS
if (uart->cts_pin >= 0) {
gpio_request(uart->cts_pin, DRIVER_NAME);
gpio_direction_input(uart->cts_pin);
}
if (uart->rts_pin >= 0) {
gpio_request(uart->rts_pin, DRIVER_NAME);
gpio_direction_output(uart->rts_pin, 0);
}
#endif
}

45
arch/blackfin/mach-bf548/include/mach/bfin_serial_5xx.h
View File

@ -181,48 +181,3 @@ struct bfin_serial_res bfin_serial_resource[] = {
};
#define DRIVER_NAME "bfin-uart"
static void bfin_serial_hw_init(struct bfin_serial_port *uart)
{
#ifdef CONFIG_SERIAL_BFIN_UART0
peripheral_request(P_UART0_TX, DRIVER_NAME);
peripheral_request(P_UART0_RX, DRIVER_NAME);
#endif
#ifdef CONFIG_SERIAL_BFIN_UART1
peripheral_request(P_UART1_TX, DRIVER_NAME);
peripheral_request(P_UART1_RX, DRIVER_NAME);
#ifdef CONFIG_BFIN_UART1_CTSRTS
peripheral_request(P_UART1_RTS, DRIVER_NAME);
peripheral_request(P_UART1_CTS, DRIVER_NAME);
#endif
#endif
#ifdef CONFIG_SERIAL_BFIN_UART2
peripheral_request(P_UART2_TX, DRIVER_NAME);
peripheral_request(P_UART2_RX, DRIVER_NAME);
#endif
#ifdef CONFIG_SERIAL_BFIN_UART3
peripheral_request(P_UART3_TX, DRIVER_NAME);
peripheral_request(P_UART3_RX, DRIVER_NAME);
#ifdef CONFIG_BFIN_UART3_CTSRTS
peripheral_request(P_UART3_RTS, DRIVER_NAME);
peripheral_request(P_UART3_CTS, DRIVER_NAME);
#endif
#endif
SSYNC();
#ifdef CONFIG_SERIAL_BFIN_CTSRTS
if (uart->cts_pin >= 0) {
gpio_request(uart->cts_pin, DRIVER_NAME);
gpio_direction_input(uart->cts_pin);
}
if (uart->rts_pin >= 0) {
gpio_request(uart->rts_pin, DRIVER_NAME);
gpio_direction_output(uart->rts_pin, 0);
}
#endif
}

20
arch/blackfin/mach-bf561/include/mach/bfin_serial_5xx.h
View File

@ -142,23 +142,3 @@ struct bfin_serial_res bfin_serial_resource[] = {
};
#define DRIVER_NAME "bfin-uart"
static void bfin_serial_hw_init(struct bfin_serial_port *uart)
{
#ifdef CONFIG_SERIAL_BFIN_UART0
peripheral_request(P_UART0_TX, DRIVER_NAME);
peripheral_request(P_UART0_RX, DRIVER_NAME);
#endif
#ifdef CONFIG_SERIAL_BFIN_CTSRTS
if (uart->cts_pin >= 0) {
gpio_request(uart->cts_pin, DRIVER_NAME);
gpio_direction_input(uart->cts_pin);
}
if (uart->rts_pin >= 0) {
gpio_request(uart->rts_pin, DRIVER_NAME);
gpio_direction_output(uart->rts_pin, 0);
}
#endif
}

135
drivers/serial/bfin_5xx.c
View File

@ -63,7 +63,6 @@ static int kgdboc_break_enabled;
#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);
@ -71,8 +70,6 @@ static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart);
static void bfin_serial_tx_chars(struct bfin_serial_port *uart);
#endif
static void bfin_serial_mctrl_check(struct bfin_serial_port *uart);
static void bfin_serial_reset_irda(struct uart_port *port);
/*
@ -264,12 +261,6 @@ static void bfin_serial_tx_chars(struct bfin_serial_port *uart)
{
struct circ_buf *xmit = &uart->port.info->xmit;
/*
* Check the modem control lines before
* transmitting anything.
*/
bfin_serial_mctrl_check(uart);
if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
#ifdef CONFIG_BF54x
/* Clear TFI bit */
@ -328,12 +319,6 @@ 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;
@ -524,29 +509,21 @@ static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
#endif
}
/*
* Handle any change of modem status signal since we were last called.
*/
static void bfin_serial_mctrl_check(struct bfin_serial_port *uart)
{
#ifdef CONFIG_SERIAL_BFIN_CTSRTS
/*
* Handle any change of modem status signal.
*/
static irqreturn_t bfin_serial_mctrl_cts_int(int irq, void *dev_id)
{
struct bfin_serial_port *uart = dev_id;
unsigned int status;
struct uart_info *info = uart->port.info;
struct tty_struct *tty = info->port.tty;
status = bfin_serial_get_mctrl(&uart->port);
uart_handle_cts_change(&uart->port, status & TIOCM_CTS);
if (!(status & TIOCM_CTS)) {
tty->hw_stopped = 1;
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;
}
#endif
return IRQ_HANDLED;
}
#endif
/*
* Interrupts are always disabled.
@ -606,7 +583,7 @@ static int bfin_serial_startup(struct uart_port *port)
uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
add_timer(&(uart->rx_dma_timer));
#else
#if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
# if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
if (kgdboc_port_line == uart->port.line && kgdboc_break_enabled)
kgdboc_break_enabled = 0;
@ -661,10 +638,27 @@ static int bfin_serial_startup(struct uart_port *port)
}
}
# endif
#if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
# if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
}
# endif
#endif
#ifdef CONFIG_SERIAL_BFIN_CTSRTS
if (uart->cts_pin >= 0) {
if (request_irq(gpio_to_irq(uart->cts_pin),
bfin_serial_mctrl_cts_int,
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
IRQF_DISABLED, "BFIN_UART_CTS", uart)) {
uart->cts_pin = -1;
pr_info("Unable to attach BlackFin UART CTS interrupt.\
So, disable it.\n");
}
}
if (uart->rts_pin >= 0) {
gpio_request(uart->rts_pin, DRIVER_NAME);
gpio_direction_output(uart->rts_pin, 0);
}
#endif
UART_SET_IER(uart, ERBFI);
return 0;
@ -699,6 +693,13 @@ static void bfin_serial_shutdown(struct uart_port *port)
free_irq(uart->port.irq, uart);
free_irq(uart->port.irq+1, uart);
#endif
# ifdef CONFIG_SERIAL_BFIN_CTSRTS
if (uart->cts_pin >= 0)
free_irq(gpio_to_irq(uart->cts_pin), uart);
if (uart->rts_pin >= 0)
gpio_free(uart->rts_pin);
# endif
}
static void
@ -864,6 +865,20 @@ static void bfin_serial_set_ldisc(struct uart_port *port)
}
}
static void bfin_serial_reset_irda(struct uart_port *port)
{
int line = port->line;
unsigned short val;
val = UART_GET_GCTL(&bfin_serial_ports[line]);
val &= ~(IREN | RPOLC);
UART_PUT_GCTL(&bfin_serial_ports[line], val);
SSYNC();
val |= (IREN | RPOLC);
UART_PUT_GCTL(&bfin_serial_ports[line], val);
SSYNC();
}
#ifdef CONFIG_CONSOLE_POLL
static void bfin_serial_poll_put_char(struct uart_port *port, unsigned char chr)
{
@ -909,20 +924,6 @@ static int bfin_kgdboc_port_startup(struct uart_port *port)
}
#endif
static void bfin_serial_reset_irda(struct uart_port *port)
{
int line = port->line;
unsigned short val;
val = UART_GET_GCTL(&bfin_serial_ports[line]);
val &= ~(IREN | RPOLC);
UART_PUT_GCTL(&bfin_serial_ports[line], val);
SSYNC();
val |= (IREN | RPOLC);
UART_PUT_GCTL(&bfin_serial_ports[line], val);
SSYNC();
}
static struct uart_ops bfin_serial_pops = {
.tx_empty = bfin_serial_tx_empty,
.set_mctrl = bfin_serial_set_mctrl,
@ -952,6 +953,39 @@ static struct uart_ops bfin_serial_pops = {
#endif
};
static void __init bfin_serial_hw_init(void)
{
#ifdef CONFIG_SERIAL_BFIN_UART0
peripheral_request(P_UART0_TX, DRIVER_NAME);
peripheral_request(P_UART0_RX, DRIVER_NAME);
#endif
#ifdef CONFIG_SERIAL_BFIN_UART1
peripheral_request(P_UART1_TX, DRIVER_NAME);
peripheral_request(P_UART1_RX, DRIVER_NAME);
# if defined(CONFIG_BFIN_UART1_CTSRTS) && defined(CONFIG_BF54x)
peripheral_request(P_UART1_RTS, DRIVER_NAME);
peripheral_request(P_UART1_CTS, DRIVER_NAME);
# endif
#endif
#ifdef CONFIG_SERIAL_BFIN_UART2
peripheral_request(P_UART2_TX, DRIVER_NAME);
peripheral_request(P_UART2_RX, DRIVER_NAME);
#endif
#ifdef CONFIG_SERIAL_BFIN_UART3
peripheral_request(P_UART3_TX, DRIVER_NAME);
peripheral_request(P_UART3_RX, DRIVER_NAME);
# if defined(CONFIG_BFIN_UART3_CTSRTS) && defined(CONFIG_BF54x)
peripheral_request(P_UART3_RTS, DRIVER_NAME);
peripheral_request(P_UART3_CTS, DRIVER_NAME);
# endif
#endif
}
static void __init bfin_serial_init_ports(void)
{
static int first = 1;
@ -961,6 +995,8 @@ static void __init bfin_serial_init_ports(void)
return;
first = 0;
bfin_serial_hw_init();
for (i = 0; i < nr_active_ports; i++) {
bfin_serial_ports[i].port.uartclk = get_sclk();
bfin_serial_ports[i].port.fifosize = BFIN_UART_TX_FIFO_SIZE;
@ -984,15 +1020,12 @@ static void __init bfin_serial_init_ports(void)
init_timer(&(bfin_serial_ports[i].rx_dma_timer));
#endif
#ifdef CONFIG_SERIAL_BFIN_CTSRTS
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 =
bfin_serial_resource[i].uart_rts_pin;
#endif
bfin_serial_hw_init(&bfin_serial_ports[i]);
}
}
#if defined(CONFIG_SERIAL_BFIN_CONSOLE) || defined(CONFIG_EARLY_PRINTK)