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path: root/drivers/tty/serial/serial_core.c
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Diffstat (limited to 'drivers/tty/serial/serial_core.c')
-rw-r--r--drivers/tty/serial/serial_core.c115
1 files changed, 49 insertions, 66 deletions
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 57ca61b14670..6a1055ae3437 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -179,14 +179,6 @@ static int uart_port_startup(struct tty_struct *tty, struct uart_state *state,
if (tty->termios.c_cflag & CBAUD)
uart_set_mctrl(uport, TIOCM_RTS | TIOCM_DTR);
}
-
- spin_lock_irq(&uport->lock);
- if (uart_cts_enabled(uport) &&
- !(uport->ops->get_mctrl(uport) & TIOCM_CTS))
- uport->hw_stopped = 1;
- else
- uport->hw_stopped = 0;
- spin_unlock_irq(&uport->lock);
}
/*
@@ -442,6 +434,7 @@ static void uart_change_speed(struct tty_struct *tty, struct uart_state *state,
{
struct uart_port *uport = state->uart_port;
struct ktermios *termios;
+ int hw_stopped;
/*
* If we have no tty, termios, or the port does not exist,
@@ -466,6 +459,18 @@ static void uart_change_speed(struct tty_struct *tty, struct uart_state *state,
uport->status &= ~UPSTAT_DCD_ENABLE;
else
uport->status |= UPSTAT_DCD_ENABLE;
+
+ /* reset sw-assisted CTS flow control based on (possibly) new mode */
+ hw_stopped = uport->hw_stopped;
+ uport->hw_stopped = uart_softcts_mode(uport) &&
+ !(uport->ops->get_mctrl(uport) & TIOCM_CTS);
+ if (uport->hw_stopped) {
+ if (!hw_stopped)
+ uport->ops->stop_tx(uport);
+ } else {
+ if (hw_stopped)
+ __uart_start(tty);
+ }
spin_unlock_irq(&uport->lock);
}
@@ -619,22 +624,22 @@ static void uart_throttle(struct tty_struct *tty)
{
struct uart_state *state = tty->driver_data;
struct uart_port *port = state->uart_port;
- upf_t mask = 0;
+ upstat_t mask = 0;
if (I_IXOFF(tty))
- mask |= UPF_SOFT_FLOW;
+ mask |= UPSTAT_AUTOXOFF;
if (tty->termios.c_cflag & CRTSCTS)
- mask |= UPF_HARD_FLOW;
+ mask |= UPSTAT_AUTORTS;
- if (port->flags & mask) {
+ if (port->status & mask) {
port->ops->throttle(port);
- mask &= ~port->flags;
+ mask &= ~port->status;
}
- if (mask & UPF_SOFT_FLOW)
+ if (mask & UPSTAT_AUTOXOFF)
uart_send_xchar(tty, STOP_CHAR(tty));
- if (mask & UPF_HARD_FLOW)
+ if (mask & UPSTAT_AUTORTS)
uart_clear_mctrl(port, TIOCM_RTS);
}
@@ -642,22 +647,22 @@ static void uart_unthrottle(struct tty_struct *tty)
{
struct uart_state *state = tty->driver_data;
struct uart_port *port = state->uart_port;
- upf_t mask = 0;
+ upstat_t mask = 0;
if (I_IXOFF(tty))
- mask |= UPF_SOFT_FLOW;
+ mask |= UPSTAT_AUTOXOFF;
if (tty->termios.c_cflag & CRTSCTS)
- mask |= UPF_HARD_FLOW;
+ mask |= UPSTAT_AUTORTS;
- if (port->flags & mask) {
+ if (port->status & mask) {
port->ops->unthrottle(port);
- mask &= ~port->flags;
+ mask &= ~port->status;
}
- if (mask & UPF_SOFT_FLOW)
+ if (mask & UPSTAT_AUTOXOFF)
uart_send_xchar(tty, START_CHAR(tty));
- if (mask & UPF_HARD_FLOW)
+ if (mask & UPSTAT_AUTORTS)
uart_set_mctrl(port, TIOCM_RTS);
}
@@ -1351,30 +1356,6 @@ static void uart_set_termios(struct tty_struct *tty,
mask |= TIOCM_RTS;
uart_set_mctrl(uport, mask);
}
-
- /*
- * If the port is doing h/w assisted flow control, do nothing.
- * We assume that port->hw_stopped has never been set.
- */
- if (uport->flags & UPF_HARD_FLOW)
- return;
-
- /* Handle turning off CRTSCTS */
- if ((old_termios->c_cflag & CRTSCTS) && !(cflag & CRTSCTS)) {
- spin_lock_irq(&uport->lock);
- uport->hw_stopped = 0;
- __uart_start(tty);
- spin_unlock_irq(&uport->lock);
- }
- /* Handle turning on CRTSCTS */
- else if (!(old_termios->c_cflag & CRTSCTS) && (cflag & CRTSCTS)) {
- spin_lock_irq(&uport->lock);
- if (!(uport->ops->get_mctrl(uport) & TIOCM_CTS)) {
- uport->hw_stopped = 1;
- uport->ops->stop_tx(uport);
- }
- spin_unlock_irq(&uport->lock);
- }
}
/*
@@ -2008,23 +1989,24 @@ int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport)
}
put_device(tty_dev);
- if (console_suspend_enabled || !uart_console(uport))
- uport->suspended = 1;
+ /* Nothing to do if the console is not suspending */
+ if (!console_suspend_enabled && uart_console(uport))
+ goto unlock;
+
+ uport->suspended = 1;
if (port->flags & ASYNC_INITIALIZED) {
const struct uart_ops *ops = uport->ops;
int tries;
- if (console_suspend_enabled || !uart_console(uport)) {
- set_bit(ASYNCB_SUSPENDED, &port->flags);
- clear_bit(ASYNCB_INITIALIZED, &port->flags);
-
- spin_lock_irq(&uport->lock);
- ops->stop_tx(uport);
- ops->set_mctrl(uport, 0);
- ops->stop_rx(uport);
- spin_unlock_irq(&uport->lock);
- }
+ set_bit(ASYNCB_SUSPENDED, &port->flags);
+ clear_bit(ASYNCB_INITIALIZED, &port->flags);
+
+ spin_lock_irq(&uport->lock);
+ ops->stop_tx(uport);
+ ops->set_mctrl(uport, 0);
+ ops->stop_rx(uport);
+ spin_unlock_irq(&uport->lock);
/*
* Wait for the transmitter to empty.
@@ -2036,19 +2018,17 @@ int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport)
drv->dev_name,
drv->tty_driver->name_base + uport->line);
- if (console_suspend_enabled || !uart_console(uport))
- ops->shutdown(uport);
+ ops->shutdown(uport);
}
/*
* Disable the console device before suspending.
*/
- if (console_suspend_enabled && uart_console(uport))
+ if (uart_console(uport))
console_stop(uport->cons);
- if (console_suspend_enabled || !uart_console(uport))
- uart_change_pm(state, UART_PM_STATE_OFF);
-
+ uart_change_pm(state, UART_PM_STATE_OFF);
+unlock:
mutex_unlock(&port->mutex);
return 0;
@@ -2164,7 +2144,9 @@ uart_report_port(struct uart_driver *drv, struct uart_port *port)
break;
}
- dev_info(port->dev, "%s%d at %s (irq = %d, base_baud = %d) is a %s\n",
+ printk(KERN_INFO "%s%s%s%d at %s (irq = %d, base_baud = %d) is a %s\n",
+ port->dev ? dev_name(port->dev) : "",
+ port->dev ? ": " : "",
drv->dev_name,
drv->tty_driver->name_base + port->line,
address, port->irq, port->uartclk / 16, uart_type(port));
@@ -2854,7 +2836,7 @@ void uart_handle_cts_change(struct uart_port *uport, unsigned int status)
uport->icount.cts++;
- if (uart_cts_enabled(uport)) {
+ if (uart_softcts_mode(uport)) {
if (uport->hw_stopped) {
if (status) {
uport->hw_stopped = 0;
@@ -2867,6 +2849,7 @@ void uart_handle_cts_change(struct uart_port *uport, unsigned int status)
uport->ops->stop_tx(uport);
}
}
+
}
}
EXPORT_SYMBOL_GPL(uart_handle_cts_change);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.