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https://github.com/fail0verflow/switch-coreboot.git
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b175ce06ac
Signed-off-by: Ronald G. Minnich <rminnich@gmail.com> Acked-by: Stefan Reinauer <stepan@coresystems.de> git-svn-id: svn://coreboot.org/repository/LinuxBIOSv3@374 f3766cd6-281f-0410-b1cd-43a5c92072e9
98 lines
2.9 KiB
C
98 lines
2.9 KiB
C
/*
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* Copyright (C) 2007 Ronald G. Minnich
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* Copyright (C) 2007 coresystems GmbH
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <types.h>
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#include <device/pnp_def.h>
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#include <io.h>
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/* very low level pnp manipulation intended for stage 0 or 1 */
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/**
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* rawpnp_enter_ext_funct -- Enter the PNP extended functions,
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* i.e. configuration mode
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* @param dev The device IO port.
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*/
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void rawpnp_enter_ext_func_mode(u16 dev)
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{
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outb(0x87, dev);
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outb(0x87, dev);
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}
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/**
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* Exit the PNP extended functions, i.e. configuration mode
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* @param dev The device IO port.
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*/
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void rawpnp_exit_ext_func_mode(u16 dev)
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{
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outb(0xaa, dev);
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}
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/**
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* Write a pnp configuration register. This is done by writing
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* the register number to the port, and the value to the
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* port+1
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* @param dev The device IO port.
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* @param reg The register number
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* @param value The new value.
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*/
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void rawpnp_write_config(u16 dev, u8 reg, u8 value)
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{
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outb(reg, dev);
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outb(value,dev + 1);
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}
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/**
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* Select a logical device. PNP has up to 16 logical devices.
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* They are selected by writing the device # to register 7.
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* @param dev The device IO port.
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* @param which Which device
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*/
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void rawpnp_set_logical_device(u16 dev, u8 which)
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{
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rawpnp_write_config(dev, 0x07, which);
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}
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/**
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* Set the enable for the device. The enable is at register 30.
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* Setting the low bit enables the device.
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* Code must have selected the proper device using
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* rawpnp_set_logical_device. If enable is non-zero, device
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* is enabled. If enable is zero, device is disabled.
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* @param dev The device IO port.
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* @param enable non-zero enables the device
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*/
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void rawpnp_set_enable(u16 dev, int enable)
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{
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rawpnp_write_config(dev, 0x30, enable ? 0x1 : 0x0);
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}
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/**
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* Set the iobase for the device. The iobase is at registers 'index'
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* and 'index + 1', since these are 8 bit registers and iobase is 16 bits.
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* Code must have selected the proper device using
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* rawpnp_set_logical_device.
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* @param dev The device IO port.
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* @param iobase The 16 bit iobase
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*/
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void rawpnp_set_iobase(u16 dev, u8 index, u16 iobase)
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{
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/* Index == 0x60 or 0x62 */
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rawpnp_write_config(dev, index + 0, (iobase >> 8) & 0xff);
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rawpnp_write_config(dev, index + 1, iobase & 0xff);
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}
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