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Commit af7f3743 authored by Alan Cox's avatar Alan Cox Committed by Greg Kroah-Hartman
Browse files

serial: abstraction for 8250 legacy ports 



Not every platform that has generic legacy 8250 ports manages to have them
clocked the right way or without errata. Provide a generic interface to
allow platforms to override the default behaviour in a manner that dumps
the complexity in *their* code not the 8250 driver.

Signed-off-by: default avatarAlan Cox <alan@linux.intel.com>
Signed-off-by: default avatarDirk Brandewie <dirk.brandewie@gmail.com>
Acked-by: default avatarThomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 4e4e6602

drivers/serial/8250.c

+17 −0
Original line number Diff line number Diff line
@@ -2672,6 +2672,16 @@ static struct uart_ops serial8250_pops = { 


static struct uart_8250_port serial8250_ports[UART_NR];



static void (*serial8250_isa_config)(int port, struct uart_port *up,

	unsigned short *capabilities);



void serial8250_set_isa_configurator(

	void (*v)(int port, struct uart_port *up, unsigned short *capabilities))

{

	serial8250_isa_config = v;

}

EXPORT_SYMBOL(serial8250_set_isa_configurator);



static void __init serial8250_isa_init_ports(void)

{

	struct uart_8250_port *up;
@@ -2717,6 +2727,9 @@ static void __init serial8250_isa_init_ports(void) 
		up->port.regshift = old_serial_port[i].iomem_reg_shift;

		set_io_from_upio(&up->port);

		up->port.irqflags |= irqflag;

		if (serial8250_isa_config != NULL)

			serial8250_isa_config(i, &up->port, &up->capabilities);



	}

}
@@ -3178,6 +3191,10 @@ int serial8250_register_port(struct uart_port *port) 
		if (port->pm)

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



		if (serial8250_isa_config != NULL)

			serial8250_isa_config(0, &uart->port,

					&uart->capabilities);



		ret = uart_add_one_port(&serial8250_reg, &uart->port);

		if (ret == 0)

			ret = uart->port.line;

include/linux/serial_8250.h

+4 −0
Original line number Diff line number Diff line
@@ -81,4 +81,8 @@ extern void serial8250_do_set_termios(struct uart_port *port, 
extern void serial8250_do_pm(struct uart_port *port, unsigned int state,

			     unsigned int oldstate);



extern void serial8250_set_isa_configurator(void (*v)

					(int port, struct uart_port *up,

						unsigned short *capabilities));



#endif