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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: Alan Cox <alan@linux.intel.com>
Signed-off-by: Dirk Brandewie <dirk.brandewie@gmail.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Cox 2010-10-18 11:38:02 -07:00 committed by Greg Kroah-Hartman
parent 4e4e66029a
commit af7f374356
2 changed files with 21 additions and 0 deletions
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17
drivers/serial/8250.c
View File

@ -2672,6 +2672,16 @@ static struct uart_ops serial8250_pops = {
static struct uart_8250_port serial8250_ports[UART_NR]; 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) static void __init serial8250_isa_init_ports(void)
{ {
struct uart_8250_port *up; 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; up->port.regshift = old_serial_port[i].iomem_reg_shift;
set_io_from_upio(&up->port); set_io_from_upio(&up->port);
up->port.irqflags |= irqflag; 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) if (port->pm)
uart->port.pm = 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); ret = uart_add_one_port(&serial8250_reg, &uart->port);
if (ret == 0) if (ret == 0)
ret = uart->port.line; ret = uart->port.line;

4
include/linux/serial_8250.h
View File

@ -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, extern void serial8250_do_pm(struct uart_port *port, unsigned int state,
unsigned int oldstate); unsigned int oldstate);
extern void serial8250_set_isa_configurator(void (*v)
(int port, struct uart_port *up,
unsigned short *capabilities));
#endif #endif