Commit f73fa05b authored by Magnus Damm's avatar Magnus Damm Committed by Greg Kroah-Hartman
Browse files

serial8250: Introduce serial8250_register_8250_port() 



Introduce yet another 8250 registration function.
This time it is serial8250_register_8250_port() and it
allows us to register 8250 hardware instances using struct
uart_8250_port. The new function makes it possible to
register 8250 hardware that makes use of 8250 specific
callbacks such as ->dl_read() and ->dl_write().

Signed-off-by: default avatarMagnus Damm <damm@opensource.se>
Acked-by: default avatarArnd Bergmann <arnd@arndb.de>
Acked-by: default avatarAlan Cox <alan@linux.intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent e8155629

drivers/tty/serial/8250/8250.c

+59 −32
Original line number Diff line number Diff line
@@ -3112,7 +3112,7 @@ static struct uart_8250_port *serial8250_find_match_or_unused(struct uart_port * 
}



/**

 *	serial8250_register_port - register a serial port

 *	serial8250_register_8250_port - register a serial port

 *	@port: serial port template

 *

 *	Configure the serial port specified by the request. If the
@@ -3124,52 +3124,56 @@ static struct uart_8250_port *serial8250_find_match_or_unused(struct uart_port * 
 *

 *	On success the port is ready to use and the line number is returned.

 */

int serial8250_register_port(struct uart_port *port)

int serial8250_register_8250_port(struct uart_8250_port *up)

{

	struct uart_8250_port *uart;

	int ret = -ENOSPC;



	if (port->uartclk == 0)

	if (up->port.uartclk == 0)

		return -EINVAL;



	mutex_lock(&serial_mutex);



	uart = serial8250_find_match_or_unused(port);

	uart = serial8250_find_match_or_unused(&up->port);

	if (uart) {

		uart_remove_one_port(&serial8250_reg, &uart->port);



		uart->port.iobase       = port->iobase;

		uart->port.membase      = port->membase;

		uart->port.irq          = port->irq;

		uart->port.irqflags     = port->irqflags;

		uart->port.uartclk      = port->uartclk;

		uart->port.fifosize     = port->fifosize;

		uart->port.regshift     = port->regshift;

		uart->port.iotype       = port->iotype;

		uart->port.flags        = port->flags | UPF_BOOT_AUTOCONF;

		uart->port.mapbase      = port->mapbase;

		uart->port.private_data = port->private_data;

		if (port->dev)

			uart->port.dev = port->dev;



		if (port->flags & UPF_FIXED_TYPE)

			serial8250_init_fixed_type_port(uart, port->type);

		uart->port.iobase       = up->port.iobase;

		uart->port.membase      = up->port.membase;

		uart->port.irq          = up->port.irq;

		uart->port.irqflags     = up->port.irqflags;

		uart->port.uartclk      = up->port.uartclk;

		uart->port.fifosize     = up->port.fifosize;

		uart->port.regshift     = up->port.regshift;

		uart->port.iotype       = up->port.iotype;

		uart->port.flags        = up->port.flags | UPF_BOOT_AUTOCONF;

		uart->port.mapbase      = up->port.mapbase;

		uart->port.private_data = up->port.private_data;

		if (up->port.dev)

			uart->port.dev = up->port.dev;



		if (up->port.flags & UPF_FIXED_TYPE)

			serial8250_init_fixed_type_port(uart, up->port.type);



		set_io_from_upio(&uart->port);

		/* Possibly override default I/O functions.  */

		if (port->serial_in)

			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;

		if (up->port.serial_in)

			uart->port.serial_in = up->port.serial_in;

		if (up->port.serial_out)

			uart->port.serial_out = up->port.serial_out;

		if (up->port.handle_irq)

			uart->port.handle_irq = up->port.handle_irq;

		/*  Possibly override set_termios call */

		if (port->set_termios)

			uart->port.set_termios = port->set_termios;

		if (port->pm)

			uart->port.pm = port->pm;

		if (port->handle_break)

			uart->port.handle_break = port->handle_break;

		if (up->port.set_termios)

			uart->port.set_termios = up->port.set_termios;

		if (up->port.pm)

			uart->port.pm = up->port.pm;

		if (up->port.handle_break)

			uart->port.handle_break = up->port.handle_break;

		if (up->dl_read)

			uart->dl_read = up->dl_read;

		if (up->dl_write)

			uart->dl_write = up->dl_write;



		if (serial8250_isa_config != NULL)

			serial8250_isa_config(0, &uart->port,
@@ -3183,6 +3187,29 @@ int serial8250_register_port(struct uart_port *port) 


	return ret;

}

EXPORT_SYMBOL(serial8250_register_8250_port);



/**

 *	serial8250_register_port - register a serial port

 *	@port: serial port template

 *

 *	Configure the serial port specified by the request. If the

 *	port exists and is in use, it is hung up and unregistered

 *	first.

 *

 *	The port is then probed and if necessary the IRQ is autodetected

 *	If this fails an error is returned.

 *

 *	On success the port is ready to use and the line number is returned.

 */

int serial8250_register_port(struct uart_port *port)

{

	struct uart_8250_port up;



	memset(&up, 0, sizeof(up));

	memcpy(&up.port, port, sizeof(*port));

	return serial8250_register_8250_port(&up);

}

EXPORT_SYMBOL(serial8250_register_port);



/**

include/linux/serial_8250.h

+1 −0
Original line number Diff line number Diff line
@@ -69,6 +69,7 @@ enum { 
struct uart_port;

struct uart_8250_port;



int serial8250_register_8250_port(struct uart_8250_port *);

int serial8250_register_port(struct uart_port *);

void serial8250_unregister_port(int line);

void serial8250_suspend_port(int line);

CRA Git | Maintained and supported by SUSTech CRA and CCSE