c3b9566de8
The JZ4740 UART interface is almost 16550 compatible. The UART module needs to be enabled by setting a bit in the FCR register and it has support for receive timeout interrupts. Instead of adding yet another machine specific quirk to the 8250 serial driver we provide a serial_out implementation which sets the required additional flags. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/1403/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
33 lines
936 B
C
33 lines
936 B
C
/*
|
|
* Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
|
|
* JZ4740 serial support
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the
|
|
* Free Software Foundation; either version 2 of the License, or (at your
|
|
* option) any later version.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with this program; if not, write to the Free Software Foundation, Inc.,
|
|
* 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*
|
|
*/
|
|
|
|
#include <linux/io.h>
|
|
#include <linux/serial_core.h>
|
|
#include <linux/serial_reg.h>
|
|
|
|
void jz4740_serial_out(struct uart_port *p, int offset, int value)
|
|
{
|
|
switch (offset) {
|
|
case UART_FCR:
|
|
value |= 0x10; /* Enable uart module */
|
|
break;
|
|
case UART_IER:
|
|
value |= (value & 0x4) << 2;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
writeb(value, p->membase + (offset << p->regshift));
|
|
}
|