diff options
| -rw-r--r-- | drivers/tty/serial/8250.c | 39 | ||||
| -rw-r--r-- | include/linux/serial_8250.h | 2 |
2 files changed, 37 insertions, 4 deletions
diff --git a/drivers/tty/serial/8250.c b/drivers/tty/serial/8250.c index f2dfec82faf8..833e011a426f 100644 --- a/drivers/tty/serial/8250.c +++ b/drivers/tty/serial/8250.c @@ -509,6 +509,8 @@ static void io_serial_out(struct uart_port *p, int offset, int value) outb(value, p->iobase + offset); } +static int serial8250_default_handle_irq(struct uart_port *port); + static void set_io_from_upio(struct uart_port *p) { struct uart_8250_port *up = @@ -557,6 +559,7 @@ static void set_io_from_upio(struct uart_port *p) } /* Remember loaded iotype */ up->cur_iotype = p->iotype; + p->handle_irq = serial8250_default_handle_irq; } static void @@ -1621,6 +1624,28 @@ static void serial8250_handle_port(struct uart_8250_port *up) spin_unlock_irqrestore(&up->port.lock, flags); } +int serial8250_handle_irq(struct uart_port *port, unsigned int iir) +{ + struct uart_8250_port *up = + container_of(port, struct uart_8250_port, port); + + if (!(iir & UART_IIR_NO_INT)) { + serial8250_handle_port(up); + return 1; + } + + return 0; +} + +static int serial8250_default_handle_irq(struct uart_port *port) +{ + struct uart_8250_port *up = + container_of(port, struct uart_8250_port, port); + unsigned int iir = serial_in(up, UART_IIR); + + return serial8250_handle_irq(port, iir); +} + /* * This is the serial driver's interrupt routine. * @@ -1648,13 +1673,12 @@ static irqreturn_t serial8250_interrupt(int irq, void *dev_id) l = i->head; do { struct uart_8250_port *up; - unsigned int iir; + struct uart_port *port; up = list_entry(l, struct uart_8250_port, list); + port = &up->port; - iir = serial_in(up, UART_IIR); - if (!(iir & UART_IIR_NO_INT)) { - serial8250_handle_port(up); + if (port->handle_irq(port)) { handled = 1; @@ -3048,6 +3072,10 @@ int __init early_serial_setup(struct uart_port *port) p->serial_in = port->serial_in; if (port->serial_out) p->serial_out = port->serial_out; + if (port->handle_irq) + p->handle_irq = port->handle_irq; + else + p->handle_irq = serial8250_default_handle_irq; return 0; } @@ -3116,6 +3144,7 @@ static int __devinit serial8250_probe(struct platform_device *dev) port.type = p->type; port.serial_in = p->serial_in; port.serial_out = p->serial_out; + port.handle_irq = p->handle_irq; port.set_termios = p->set_termios; port.pm = p->pm; port.dev = &dev->dev; @@ -3281,6 +3310,8 @@ int serial8250_register_port(struct uart_port *port) uart->port.serial_in = port->serial_in; if (port->serial_out) uart->port.serial_out = port->serial_out; + if (port->handle_irq) + uart->port.handle_irq = port->handle_irq; /* Possibly override set_termios call */ if (port->set_termios) uart->port.set_termios = port->set_termios; diff --git a/include/linux/serial_8250.h b/include/linux/serial_8250.h index 97f5b45bbc07..1f05bbeac01e 100644 --- a/include/linux/serial_8250.h +++ b/include/linux/serial_8250.h @@ -35,6 +35,7 @@ struct plat_serial8250_port { void (*set_termios)(struct uart_port *, struct ktermios *new, struct ktermios *old); + int (*handle_irq)(struct uart_port *); void (*pm)(struct uart_port *, unsigned int state, unsigned old); }; @@ -80,6 +81,7 @@ extern void serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios, struct ktermios *old); extern void serial8250_do_pm(struct uart_port *port, unsigned int state, unsigned int oldstate); +int serial8250_handle_irq(struct uart_port *port, unsigned int iir); extern void serial8250_set_isa_configurator(void (*v) (int port, struct uart_port *up, |