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serial: 8250: allow specifying iomem size in addition to address 

This adds a mapsize field to struct uart_port to be used in
conjunction with mapbase. If set, it overrides whatever value
serial8250_port_size() would otherwise report.

Signed-off-by: Mans Rullgard <mans@mansr.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mans Rullgard 2015-03-08 14:30:04 +00:00 committed by Greg Kroah-Hartman
parent 5ef86b7420
commit ee97d0e3f0
2 changed files with 5 additions and 0 deletions
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4
drivers/tty/serial/8250/8250_core.c
View File

@ -2722,6 +2722,8 @@ serial8250_pm(struct uart_port *port, unsigned int state,
static unsigned int serial8250_port_size(struct uart_8250_port *pt)
{
if (pt->port.mapsize)
return pt->port.mapsize;
if (pt->port.iotype == UPIO_AU) {
if (pt->port.type == PORT_RT2880)
return 0x100;
@ -3553,6 +3555,7 @@ int __init early_serial_setup(struct uart_port *port)
p->iotype = port->iotype;
p->flags = port->flags;
p->mapbase = port->mapbase;
p->mapsize = port->mapsize;
p->private_data = port->private_data;
p->type = port->type;
p->line = port->line;
@ -3807,6 +3810,7 @@ int serial8250_register_8250_port(struct uart_8250_port *up)
uart->port.flags = up->port.flags | UPF_BOOT_AUTOCONF;
uart->bugs = up->bugs;
uart->port.mapbase = up->port.mapbase;
uart->port.mapsize = up->port.mapsize;
uart->port.private_data = up->port.private_data;
uart->port.fifosize = up->port.fifosize;
uart->tx_loadsz = up->tx_loadsz;

1
include/linux/serial_core.h
View File

@ -237,6 +237,7 @@ struct uart_port {
unsigned int line; /* port index */
unsigned int minor;
resource_size_t mapbase; /* for ioremap */
resource_size_t mapsize;
struct device *dev; /* parent device */
unsigned char hub6; /* this should be in the 8250 driver */
unsigned char suspended;