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x86: Add a simple superio driver for SMSC LPC47M

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On most x86 boards, the legacy serial ports (io address 0x3f8/0x2f8)
are provided by a superio chip connected to the LPC bus. We must
program the superio chip so that serial ports are available for us.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Bin Meng
2014-12-12 21:05:25 +08:00
committed by Simon Glass
parent 568868dda9
commit a2927e09bc
4 changed files with 143 additions and 0 deletions
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19
include/smsc_lpc47m.h Normal file
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/*
* Copyright (C) 2014, Bin Meng <bmeng.cn@gmail.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef _SMSC_LPC47M_H_
#define _SMSC_LPC47M_H_
/**
* Configure the base I/O port of the specified serial device and enable the
* serial device.
*
* @dev: High 8 bits = Super I/O port, low 8 bits = logical device number.
* @iobase: Processor I/O port address to assign to this serial device.
*/
void lpc47m_enable_serial(u16 dev, u16 iobase);
#endif /* _SMSC_LPC47M_H_ */