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>

1 files changed, 17 insertions, 0 deletions

diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
index 6994afb5571a..37f19a678c97 100644
--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -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;