target/linux/xburst/patches-2.6.35/012-serial.patch

   1 From d9d3dc9a5a28b2bbb82fedca63aadae8ca540e94 Mon Sep 17 00:00:00 2001
   2 From: Lars-Peter Clausen <lars@metafoo.de>
   3 Date: Sat, 19 Jun 2010 04:08:16 +0000
   4 Subject: [PATCH] MIPS: JZ4740: Add serial support
   5
   6 The JZ4740 UART interface is almost 16550 compatible.
   7 The UART module needs to be enabled by setting a bit in the FCR register
   8 and it has support for receive timeout interrupts.  Instead of adding yet
   9 another machine specific quirk to the 8250 serial driver we provide a
  10 serial_out implementation which sets the required additional flags.
  11
  12 Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
  13 Cc: linux-mips@linux-mips.org
  14 Cc: linux-kernel@vger.kernel.org
  15 Patchwork: https://patchwork.linux-mips.org/patch/1403/
  16 Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
  17 ---
  18  arch/mips/jz4740/serial.c |   33 +++++++++++++++++++++++++++++++++
  19  arch/mips/jz4740/serial.h |   20 ++++++++++++++++++++
  20  2 files changed, 53 insertions(+), 0 deletions(-)
  21  create mode 100644 arch/mips/jz4740/serial.c
  22  create mode 100644 arch/mips/jz4740/serial.h
  23
  24 --- /dev/null
  25 +++ b/arch/mips/jz4740/serial.c
  26 @@ -0,0 +1,33 @@
  27 +/*
  28 + *  Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
  29 + *  JZ4740 serial support
  30 + *
  31 + *  This program is free software; you can redistribute         it and/or modify it
  32 + *  under  the terms of         the GNU General  Public License as published by the
  33 + *  Free Software Foundation;  either version 2 of the License, or (at your
  34 + *  option) any later version.
  35 + *
  36 + *  You should have received a copy of the  GNU General Public License along
  37 + *  with this program; if not, write  to the Free Software Foundation, Inc.,
  38 + *  675 Mass Ave, Cambridge, MA 02139, USA.
  39 + *
  40 + */
  41 +
  42 +#include <linux/io.h>
  43 +#include <linux/serial_core.h>
  44 +#include <linux/serial_reg.h>
  45 +
  46 +void jz4740_serial_out(struct uart_port *p, int offset, int value)
  47 +{
  48 +       switch (offset) {
  49 +       case UART_FCR:
  50 +               value |= 0x10; /* Enable uart module */
  51 +               break;
  52 +       case UART_IER:
  53 +               value |= (value & 0x4) << 2;
  54 +               break;
  55 +       default:
  56 +               break;
  57 +       }
  58 +       writeb(value, p->membase + (offset << p->regshift));
  59 +}
  60 --- /dev/null
  61 +++ b/arch/mips/jz4740/serial.h
  62 @@ -0,0 +1,20 @@
  63 +/*
  64 + *  Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
  65 + *  JZ4740 serial support
  66 + *
  67 + *  This program is free software; you can redistribute         it and/or modify it
  68 + *  under  the terms of         the GNU General  Public License as published by the
  69 + *  Free Software Foundation;  either version 2 of the License, or (at your
  70 + *  option) any later version.
  71 + *
  72 + *  You should have received a copy of the  GNU General Public License along
  73 + *  with this program; if not, write  to the Free Software Foundation, Inc.,
  74 + *  675 Mass Ave, Cambridge, MA 02139, USA.
  75 + *
  76 + */
  77 +
  78 +#ifndef __MIPS_JZ4740_SERIAL_H__
  79 +
  80 +void jz4740_serial_out(struct uart_port *p, int offset, int value);
  81 +
  82 +#endif